2016-02-24  Nikos Andronikos  <nikos.andronikos-webkit@cisra.canon.com.au>

        [web-animations] Add AnimationTimeline, DocumentTimeline and add extensions to Document interface
        https://bugs.webkit.org/show_bug.cgi?id=151688

        Reviewed by Dean Jackson.

        Enables the WEB_ANIMATIONS compiler switch.

        * Configurations/FeatureDefines.xcconfig:

2016-02-24  Konstantin Tokarev  <annulen@yandex.ru>

        [cmake] Moved PRE/POST_BUILD_COMMAND to WEBKIT_FRAMEWORK.
        https://bugs.webkit.org/show_bug.cgi?id=154651

        Reviewed by Alex Christensen.

        * CMakeLists.txt: Moved shared code to WEBKIT_FRAMEWORK macro.

2016-02-24  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r197033.
        https://bugs.webkit.org/show_bug.cgi?id=154649

        "It broke JSC tests when 'this' was loaded from global scope"
        (Requested by saamyjoon on #webkit).

        Reverted changeset:

        "[ES6] Arrow function syntax. Emit loading&putting this/super
        only if they are used in arrow function"
        https://bugs.webkit.org/show_bug.cgi?id=153981
        http://trac.webkit.org/changeset/197033

2016-02-24  Saam Barati  <sbarati@apple.com>

        [ES6] Implement Proxy.[[Delete]]
        https://bugs.webkit.org/show_bug.cgi?id=154607

        Reviewed by Mark Lam.

        This patch implements Proxy.[[Delete]] with respect to section 9.5.10 of the ECMAScript spec.
        https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-delete-p

        * runtime/ProxyObject.cpp:
        (JSC::ProxyObject::getConstructData):
        (JSC::ProxyObject::performDelete):
        (JSC::ProxyObject::deleteProperty):
        (JSC::ProxyObject::deletePropertyByIndex):
        * runtime/ProxyObject.h:
        * tests/es6.yaml:
        * tests/stress/proxy-delete.js: Added.
        (assert):
        (throw.new.Error.let.handler.get deleteProperty):
        (throw.new.Error):
        (assert.let.handler.deleteProperty):
        (let.handler.deleteProperty):

2016-02-24  Filip Pizlo  <fpizlo@apple.com>

        Stackmaps have problems with double register constraints
        https://bugs.webkit.org/show_bug.cgi?id=154643

        Reviewed by Geoffrey Garen.

        This is currently a benign bug. I found it while playing.

        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::fillStackmap):
        * b3/testb3.cpp:
        (JSC::B3::testURShiftSelf64):
        (JSC::B3::testPatchpointDoubleRegs):
        (JSC::B3::zero):
        (JSC::B3::run):

2016-02-24  Skachkov Oleksandr  <gskachkov@gmail.com>

        [ES6] Arrow function syntax. Emit loading&putting this/super only if they are used in arrow function
        https://bugs.webkit.org/show_bug.cgi?id=153981

        Reviewed by Saam Barati.
       
        In first iteration of implemenation arrow function, we emit load and store variables 'this', 'arguments',
        'super', 'new.target' in case if arrow function is exist even variables are not used in arrow function. 
        Current patch added logic that prevent from emiting those varibles if they are not used in arrow function.
        During syntax analyze parser store information about using variables in arrow function inside of 
        the ordinary function scope and then put to BytecodeGenerator through UnlinkedCodeBlock

        * bytecode/ExecutableInfo.h:
        (JSC::ExecutableInfo::ExecutableInfo):
        (JSC::ExecutableInfo::arrowFunctionCodeFeatures):
        * bytecode/UnlinkedCodeBlock.cpp:
        (JSC::UnlinkedCodeBlock::UnlinkedCodeBlock):
        * bytecode/UnlinkedCodeBlock.h:
        (JSC::UnlinkedCodeBlock::arrowFunctionCodeFeatures):
        (JSC::UnlinkedCodeBlock::doAnyInnerArrowFunctionsUseArguments):
        (JSC::UnlinkedCodeBlock::doAnyInnerArrowFunctionsUseSuperCall):
        (JSC::UnlinkedCodeBlock::doAnyInnerArrowFunctionsUseSuperProperty):
        (JSC::UnlinkedCodeBlock::doAnyInnerArrowFunctionsUseEval):
        (JSC::UnlinkedCodeBlock::doAnyInnerArrowFunctionsUseThis):
        (JSC::UnlinkedCodeBlock::doAnyInnerArrowFunctionsUseNewTarget):
        * bytecode/UnlinkedFunctionExecutable.cpp:
        (JSC::generateUnlinkedFunctionCodeBlock):
        (JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
        * bytecode/UnlinkedFunctionExecutable.h:
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::BytecodeGenerator):
        (JSC::BytecodeGenerator::initializeArrowFunctionContextScopeIfNeeded):
        (JSC::BytecodeGenerator::emitLoadArrowFunctionLexicalEnvironment):
        (JSC::BytecodeGenerator::emitLoadThisFromArrowFunctionLexicalEnvironment):
        (JSC::BytecodeGenerator::emitLoadNewTargetFromArrowFunctionLexicalEnvironment):
        (JSC::BytecodeGenerator::emitLoadDerivedConstructorFromArrowFunctionLexicalEnvironment):
        (JSC::BytecodeGenerator::isThisUsedInInnerArrowFunction):
        (JSC::BytecodeGenerator::isArgumentsUsedInInnerArrowFunction):
        (JSC::BytecodeGenerator::isNewTargetUsedInInnerArrowFunction):
        (JSC::BytecodeGenerator::isSuperUsedInInnerArrowFunction):
        (JSC::BytecodeGenerator::emitPutNewTargetToArrowFunctionContextScope):
        (JSC::BytecodeGenerator::emitPutDerivedConstructorToArrowFunctionContextScope):
        (JSC::BytecodeGenerator::emitPutThisToArrowFunctionContextScope):
        * bytecompiler/BytecodeGenerator.h:
        * bytecompiler/NodesCodegen.cpp:
        (JSC::ThisNode::emitBytecode):
        (JSC::EvalFunctionCallNode::emitBytecode):
        (JSC::FunctionCallValueNode::emitBytecode):
        (JSC::FunctionNode::emitBytecode):
        * parser/ASTBuilder.h:
        (JSC::ASTBuilder::createFunctionMetadata):
        * parser/Nodes.cpp:
        (JSC::FunctionMetadataNode::FunctionMetadataNode):
        * parser/Nodes.h:
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseGeneratorFunctionSourceElements):
        (JSC::Parser<LexerType>::parseFunctionBody):
        (JSC::Parser<LexerType>::parseFunctionInfo):
        (JSC::Parser<LexerType>::parseProperty):
        (JSC::Parser<LexerType>::parsePrimaryExpression):
        (JSC::Parser<LexerType>::parseMemberExpression):
        * parser/Parser.h:
        (JSC::Scope::Scope):
        (JSC::Scope::isArrowFunctionBoundary):
        (JSC::Scope::innerArrowFunctionFeatures):
        (JSC::Scope::setInnerArrowFunctionUseSuperCall):
        (JSC::Scope::setInnerArrowFunctionUseSuperProperty):
        (JSC::Scope::setInnerArrowFunctionUseEval):
        (JSC::Scope::setInnerArrowFunctionUseThis):
        (JSC::Scope::setInnerArrowFunctionUseNewTarget):
        (JSC::Scope::setInnerArrowFunctionUseArguments):
        (JSC::Scope::setInnerArrowFunctionUseEvalAndUseArgumentsIfNeeded):
        (JSC::Scope::collectFreeVariables):
        (JSC::Scope::mergeInnerArrowFunctionFeatures):
        (JSC::Scope::fillParametersForSourceProviderCache):
        (JSC::Scope::restoreFromSourceProviderCache):
        (JSC::Scope::setIsFunction):
        (JSC::Scope::setIsArrowFunction):
        (JSC::Parser::closestParentNonArrowFunctionNonLexicalScope):
        (JSC::Parser::pushScope):
        (JSC::Parser::popScopeInternal):
        * parser/ParserModes.h:
        * parser/SourceProviderCacheItem.h:
        (JSC::SourceProviderCacheItem::SourceProviderCacheItem):
        * parser/SyntaxChecker.h:
        (JSC::SyntaxChecker::createFunctionMetadata):
        * tests/stress/arrowfunction-lexical-bind-arguments-non-strict-1.js:
        * tests/stress/arrowfunction-lexical-bind-arguments-strict.js:
        * tests/stress/arrowfunction-lexical-bind-newtarget.js:
        * tests/stress/arrowfunction-lexical-bind-superproperty.js:
        * tests/stress/arrowfunction-lexical-bind-this-8.js: Added.

2016-02-23  Brian Burg  <bburg@apple.com>

        Web Inspector: teach the Objective-C protocol generators about --frontend and --backend directives
        https://bugs.webkit.org/show_bug.cgi?id=154615
        <rdar://problem/24804330>

        Reviewed by Timothy Hatcher.

        Some of the generated Objective-C bindings are only relevant to code acting as the
        protocol backend. Add a per-generator setting mechanism and propagate --frontend and
        --backend to all generators. Use the setting in a few generators to omit code that's
        not needed.

        Also fix a few places where the code emits the wrong Objective-C class prefix.
        There is some common non-generated code that must always have the RWIProtocol prefix.

        Lastly, change includes to use RWIProtocolJSONObjectPrivate.h instead of *Internal.h. The
        macros defined in the internal header now need to be used outside of the framework.

        * inspector/scripts/codegen/generate_objc_conversion_helpers.py:
        Use OBJC_STATIC_PREFIX along with the file name and use different include syntax
        depending on the target framework.

        * inspector/scripts/codegen/generate_objc_header.py:
        (ObjCHeaderGenerator.generate_output):
        For now, omit generating command protocol and event dispatchers when generating for --frontend.

        (ObjCHeaderGenerator._generate_type_interface):
        Use OBJC_STATIC_PREFIX along with the unprefixed file name.

        * inspector/scripts/codegen/generate_objc_internal_header.py:
        Use RWIProtocolJSONObjectPrivate.h instead.

        * inspector/scripts/codegen/generate_objc_protocol_types_implementation.py:
        (ObjCProtocolTypesImplementationGenerator.generate_output):
        Include the Internal header if it's being generated (only for --backend).

        * inspector/scripts/codegen/generator.py:
        (Generator.__init__):
        (Generator.set_generator_setting):
        (Generator):
        (Generator.get_generator_setting):
        Crib a simple setting system from the Framework class. Make the names more obnoxious.

        (Generator.string_for_file_include):
        Inspired by the replay input generator, this is a function that uses the proper syntax
        for a file include depending on the file's framework and target framework.

        * inspector/scripts/codegen/objc_generator.py:
        (ObjCGenerator.and):
        (ObjCGenerator.and.objc_prefix):
        (ObjCGenerator):
        (ObjCGenerator.objc_type_for_raw_name):
        (ObjCGenerator.objc_class_for_raw_name):
        Whitelist the 'Automation' domain for the ObjC generators. Revise use of OBJC_STATIC_PREFIX.

        * inspector/scripts/generate-inspector-protocol-bindings.py:
        (generate_from_specification):
        Change the generators to use for the frontend. Propagate --frontend and --backend.

        * inspector/scripts/tests/expected/commands-with-async-attribute.json-result:
        * inspector/scripts/tests/expected/commands-with-optional-call-return-parameters.json-result:
        * inspector/scripts/tests/expected/domains-with-varying-command-sizes.json-result:
        * inspector/scripts/tests/expected/enum-values.json-result:
        * inspector/scripts/tests/expected/events-with-optional-parameters.json-result:
        * inspector/scripts/tests/expected/generate-domains-with-feature-guards.json-result:
        * inspector/scripts/tests/expected/same-type-id-different-domain.json-result:
        * inspector/scripts/tests/expected/shadowed-optional-type-setters.json-result:
        * inspector/scripts/tests/expected/type-declaration-aliased-primitive-type.json-result:
        * inspector/scripts/tests/expected/type-declaration-array-type.json-result:
        * inspector/scripts/tests/expected/type-declaration-enum-type.json-result:
        * inspector/scripts/tests/expected/type-declaration-object-type.json-result:
        * inspector/scripts/tests/expected/type-requiring-runtime-casts.json-result:
        Rebaseline tests. They now correctly include RWIProtocolJSONObject.h and the like.

2016-02-23  Saam barati  <sbarati@apple.com>

        arrayProtoFuncConcat doesn't check for an exception after allocating an array
        https://bugs.webkit.org/show_bug.cgi?id=154621

        Reviewed by Michael Saboff.

        * runtime/ArrayPrototype.cpp:
        (JSC::arrayProtoFuncConcat):

2016-02-23  Dan Bernstein  <mitz@apple.com>

        [Xcode] Linker errors display mangled names, but no longer should
        https://bugs.webkit.org/show_bug.cgi?id=154632

        Reviewed by Sam Weinig.

        * Configurations/Base.xcconfig: Stop setting LINKER_DISPLAYS_MANGLED_NAMES to YES.

2016-02-23  Gavin Barraclough  <barraclough@apple.com>

        Remove HIDDEN_PAGE_DOM_TIMER_THROTTLING feature define
        https://bugs.webkit.org/show_bug.cgi?id=112323

        Reviewed by Chris Dumez.

        This feature is controlled by a runtime switch, and defaults off.

        * Configurations/FeatureDefines.xcconfig:

2016-02-23  Keith Miller  <keith_miller@apple.com>

        JSC stress tests' standalone-pre.js should exit on the first failure by default
        https://bugs.webkit.org/show_bug.cgi?id=154565

        Reviewed by Mark Lam.

        Currently, if a test writer does not call finishJSTest() at the end of
        any test using stress/resources/standalone-pre.js then the test can fail
        without actually reporting an error to the harness. By default, we
        should throw on the first error so, in the event someone does not call
        finishJSTest() the harness will still notice the error.

        * tests/stress/regress-151324.js:
        * tests/stress/resources/standalone-pre.js:
        (testFailed):

2016-02-23  Saam barati  <sbarati@apple.com>

        Make JSObject::getMethod have fewer branches
        https://bugs.webkit.org/show_bug.cgi?id=154603

        Reviewed by Mark Lam.

        Writing code with fewer branches is almost always better.

        * runtime/JSObject.cpp:
        (JSC::JSObject::getMethod):

2016-02-23  Filip Pizlo  <fpizlo@apple.com>

        B3::Value doesn't self-destruct virtually enough (Causes many leaks in LowerDFGToB3::appendOSRExit)
        https://bugs.webkit.org/show_bug.cgi?id=154592

        Reviewed by Saam Barati.

        If Foo has a virtual destructor, then:

        foo->Foo::~Foo() does a non-virtual call to Foo's destructor. Even if foo points to a
        subclass of Foo that overrides the destructor, this syntax will not call that override.

        foo->~Foo() does a virtual call to the destructor, and so if foo points to a subclass, you
        get the subclass's override.

        In B3, we used this->Value::~Value() thinking that it would call the subclass's override.
        This caused leaks because this didn't actually call the subclass's override. This fixes the
        problem by using this->~Value() instead.

        * b3/B3ControlValue.cpp:
        (JSC::B3::ControlValue::convertToJump):
        (JSC::B3::ControlValue::convertToOops):
        * b3/B3Value.cpp:
        (JSC::B3::Value::replaceWithIdentity):
        (JSC::B3::Value::replaceWithNop):
        (JSC::B3::Value::replaceWithPhi):

2016-02-23  Brian Burg  <bburg@apple.com>

        Web Inspector: the protocol generator's Objective-C name prefix should be configurable
        https://bugs.webkit.org/show_bug.cgi?id=154596
        <rdar://problem/24794962>

        Reviewed by Timothy Hatcher.

        In order to support different generated protocol sets that don't have conflicting
        file and type names, allow the Objective-C prefix to be configurable based on the
        target framework. Each name also has the implicit prefix 'Protocol' appended to the
        per-target framework prefix.

        For example, the existing protocol for remote inspection has the prefix 'RWI'
        and is generated as 'RWIProtocol'. The WebKit framework has the 'Automation' prefix
        and is generated as 'AutomationProtocol'.

        To make this change, convert ObjCGenerator to be a subclass of Generator and use
        the instance method model() to find the target framework and its setting for
        'objc_prefix'. Make all ObjC generators subclass ObjCGenerator so they can use
        these instance methods that used to be static methods. This is a large but
        mechanical change to use self instead of ObjCGenerator.

        * inspector/scripts/codegen/generate_objc_backend_dispatcher_header.py:
        (ObjCBackendDispatcherHeaderGenerator):
        (ObjCBackendDispatcherHeaderGenerator.__init__):
        (ObjCBackendDispatcherHeaderGenerator.output_filename):
        (ObjCBackendDispatcherHeaderGenerator._generate_objc_forward_declarations):
        (ObjCBackendDispatcherHeaderGenerator._generate_objc_handler_declarations_for_domain):
        * inspector/scripts/codegen/generate_objc_backend_dispatcher_implementation.py:
        (ObjCConfigurationImplementationGenerator):
        (ObjCConfigurationImplementationGenerator.__init__):
        (ObjCConfigurationImplementationGenerator.output_filename):
        (ObjCConfigurationImplementationGenerator.generate_output):
        (ObjCConfigurationImplementationGenerator._generate_success_block_for_command):
        (ObjCConfigurationImplementationGenerator._generate_success_block_for_command.and):
        (ObjCConfigurationImplementationGenerator._generate_conversions_for_command):
        * inspector/scripts/codegen/generate_objc_configuration_header.py:
        (ObjCConfigurationHeaderGenerator):
        (ObjCConfigurationHeaderGenerator.__init__):
        (ObjCConfigurationHeaderGenerator.output_filename):
        (ObjCConfigurationHeaderGenerator.generate_output):
        (ObjCConfigurationHeaderGenerator._generate_configuration_interface_for_domains):
        (ObjCConfigurationHeaderGenerator._generate_properties_for_domain):
        * inspector/scripts/codegen/generate_objc_configuration_implementation.py:
        (ObjCBackendDispatcherImplementationGenerator):
        (ObjCBackendDispatcherImplementationGenerator.__init__):
        (ObjCBackendDispatcherImplementationGenerator.output_filename):
        (ObjCBackendDispatcherImplementationGenerator.generate_output):
        (ObjCBackendDispatcherImplementationGenerator._generate_configuration_implementation_for_domains):
        (ObjCBackendDispatcherImplementationGenerator._generate_ivars):
        (ObjCBackendDispatcherImplementationGenerator._generate_handler_setter_for_domain):
        (ObjCBackendDispatcherImplementationGenerator._generate_event_dispatcher_getter_for_domain):
        * inspector/scripts/codegen/generate_objc_conversion_helpers.py:
        (ObjCConversionHelpersGenerator):
        (ObjCConversionHelpersGenerator.__init__):
        (ObjCConversionHelpersGenerator.output_filename):
        (ObjCConversionHelpersGenerator.generate_output):
        (ObjCConversionHelpersGenerator._generate_anonymous_enum_conversion_for_declaration):
        (ObjCConversionHelpersGenerator._generate_anonymous_enum_conversion_for_member):
        (ObjCConversionHelpersGenerator._generate_anonymous_enum_conversion_for_parameter):
        * inspector/scripts/codegen/generate_objc_frontend_dispatcher_implementation.py:
        (ObjCFrontendDispatcherImplementationGenerator):
        (ObjCFrontendDispatcherImplementationGenerator.__init__):
        (ObjCFrontendDispatcherImplementationGenerator.output_filename):
        (ObjCFrontendDispatcherImplementationGenerator.generate_output):
        (ObjCFrontendDispatcherImplementationGenerator._generate_event_dispatcher_implementations):
        (ObjCFrontendDispatcherImplementationGenerator._generate_event):
        (ObjCFrontendDispatcherImplementationGenerator._generate_event.and):
        (ObjCFrontendDispatcherImplementationGenerator._generate_event_signature):
        (ObjCFrontendDispatcherImplementationGenerator._generate_event_out_parameters):
        * inspector/scripts/codegen/generate_objc_header.py:
        (ObjCHeaderGenerator):
        (ObjCHeaderGenerator.__init__):
        (ObjCHeaderGenerator.output_filename):
        (ObjCHeaderGenerator.generate_output):
        (ObjCHeaderGenerator._generate_forward_declarations):
        (ObjCHeaderGenerator._generate_anonymous_enum_for_declaration):
        (ObjCHeaderGenerator._generate_anonymous_enum_for_member):
        (ObjCHeaderGenerator._generate_anonymous_enum_for_parameter):
        (ObjCHeaderGenerator._generate_type_interface):
        (ObjCHeaderGenerator._generate_init_method_for_required_members):
        (ObjCHeaderGenerator._generate_member_property):
        (ObjCHeaderGenerator._generate_command_protocols):
        (ObjCHeaderGenerator._generate_single_command_protocol):
        (ObjCHeaderGenerator._callback_block_for_command):
        (ObjCHeaderGenerator._generate_event_interfaces):
        (ObjCHeaderGenerator._generate_single_event_interface):
        * inspector/scripts/codegen/generate_objc_internal_header.py:
        (ObjCInternalHeaderGenerator):
        (ObjCInternalHeaderGenerator.__init__):
        (ObjCInternalHeaderGenerator.output_filename):
        (ObjCInternalHeaderGenerator.generate_output):
        (ObjCInternalHeaderGenerator._generate_event_dispatcher_private_interfaces):
        * inspector/scripts/codegen/generate_objc_protocol_types_implementation.py:
        (ObjCProtocolTypesImplementationGenerator):
        (ObjCProtocolTypesImplementationGenerator.__init__):
        (ObjCProtocolTypesImplementationGenerator.output_filename):
        (ObjCProtocolTypesImplementationGenerator.generate_output):
        (ObjCProtocolTypesImplementationGenerator.generate_type_implementation):
        (ObjCProtocolTypesImplementationGenerator._generate_init_method_for_required_members):
        (ObjCProtocolTypesImplementationGenerator._generate_init_method_for_required_members.and):
        (ObjCProtocolTypesImplementationGenerator._generate_setter_for_member):
        (ObjCProtocolTypesImplementationGenerator._generate_setter_for_member.and):
        (ObjCProtocolTypesImplementationGenerator._generate_getter_for_member):
        * inspector/scripts/codegen/models.py:
        * inspector/scripts/codegen/objc_generator.py:
        (ObjCTypeCategory.category_for_type):
        (ObjCGenerator):
        (ObjCGenerator.__init__):
        (ObjCGenerator.objc_prefix):
        (ObjCGenerator.objc_name_for_type):
        (ObjCGenerator.objc_enum_name_for_anonymous_enum_declaration):
        (ObjCGenerator.objc_enum_name_for_anonymous_enum_member):
        (ObjCGenerator.objc_enum_name_for_anonymous_enum_parameter):
        (ObjCGenerator.objc_enum_name_for_non_anonymous_enum):
        (ObjCGenerator.objc_class_for_type):
        (ObjCGenerator.objc_class_for_array_type):
        (ObjCGenerator.objc_accessor_type_for_member):
        (ObjCGenerator.objc_accessor_type_for_member_internal):
        (ObjCGenerator.objc_type_for_member):
        (ObjCGenerator.objc_type_for_member_internal):
        (ObjCGenerator.objc_type_for_param):
        (ObjCGenerator.objc_type_for_param_internal):
        (ObjCGenerator.objc_protocol_export_expression_for_variable):
        (ObjCGenerator.objc_protocol_import_expression_for_member):
        (ObjCGenerator.objc_protocol_import_expression_for_parameter):
        (ObjCGenerator.objc_protocol_import_expression_for_variable):
        (ObjCGenerator.objc_to_protocol_expression_for_member):
        (ObjCGenerator.protocol_to_objc_expression_for_member):

        Change the prefix for the 'Test' target framework to be 'Test.' Rebaseline results.

        * inspector/scripts/tests/expected/commands-with-async-attribute.json-result:
        * inspector/scripts/tests/expected/commands-with-optional-call-return-parameters.json-result:
        * inspector/scripts/tests/expected/domains-with-varying-command-sizes.json-result:
        * inspector/scripts/tests/expected/enum-values.json-result:
        * inspector/scripts/tests/expected/events-with-optional-parameters.json-result:
        * inspector/scripts/tests/expected/generate-domains-with-feature-guards.json-result:
        * inspector/scripts/tests/expected/same-type-id-different-domain.json-result:
        * inspector/scripts/tests/expected/shadowed-optional-type-setters.json-result:
        * inspector/scripts/tests/expected/type-declaration-aliased-primitive-type.json-result:
        * inspector/scripts/tests/expected/type-declaration-array-type.json-result:
        * inspector/scripts/tests/expected/type-declaration-enum-type.json-result:
        * inspector/scripts/tests/expected/type-declaration-object-type.json-result:
        * inspector/scripts/tests/expected/type-requiring-runtime-casts.json-result:

2016-02-23  Mark Lam  <mark.lam@apple.com>

        Debug assertion failure while loading http://kangax.github.io/compat-table/es6/.
        https://bugs.webkit.org/show_bug.cgi?id=154542

        Reviewed by Saam Barati.

        According to the spec, the constructors of the following types "are not intended
        to be called as a function and will throw an exception".  These types are:
            TypedArrays - https://tc39.github.io/ecma262/#sec-typedarray-constructors
            Map - https://tc39.github.io/ecma262/#sec-map-constructor
            Set - https://tc39.github.io/ecma262/#sec-set-constructor
            WeakMap - https://tc39.github.io/ecma262/#sec-weakmap-constructor
            WeakSet - https://tc39.github.io/ecma262/#sec-weakset-constructor
            ArrayBuffer - https://tc39.github.io/ecma262/#sec-arraybuffer-constructor
            DataView - https://tc39.github.io/ecma262/#sec-dataview-constructor
            Promise - https://tc39.github.io/ecma262/#sec-promise-constructor
            Proxy - https://tc39.github.io/ecma262/#sec-proxy-constructor

        This patch does the foillowing:
        1. Ensures that these constructors can be called but will throw a TypeError
           when called.
        2. Makes all these objects use throwConstructorCannotBeCalledAsFunctionTypeError()
           in their implementation to be consistent.
        3. Change the error message to "calling XXX constructor without new is invalid".
           This is clearer because the error is likely due to the user forgetting to use
           the new operator on these constructors.

        * runtime/Error.h:
        * runtime/Error.cpp:
        (JSC::throwConstructorCannotBeCalledAsFunctionTypeError):
        - Added a convenience function to throw the TypeError.

        * runtime/JSArrayBufferConstructor.cpp:
        (JSC::constructArrayBuffer):
        (JSC::callArrayBuffer):
        (JSC::JSArrayBufferConstructor::getCallData):
        * runtime/JSGenericTypedArrayViewConstructorInlines.h:
        (JSC::callGenericTypedArrayView):
        (JSC::JSGenericTypedArrayViewConstructor<ViewClass>::getCallData):
        * runtime/JSPromiseConstructor.cpp:
        (JSC::callPromise):
        * runtime/MapConstructor.cpp:
        (JSC::callMap):
        * runtime/ProxyConstructor.cpp:
        (JSC::callProxy):
        (JSC::ProxyConstructor::getCallData):
        * runtime/SetConstructor.cpp:
        (JSC::callSet):
        * runtime/WeakMapConstructor.cpp:
        (JSC::callWeakMap):
        * runtime/WeakSetConstructor.cpp:
        (JSC::callWeakSet):

        * tests/es6.yaml:
        - The typed_arrays_%TypedArray%[Symbol.species].js test now passes.

        * tests/stress/call-non-calleable-constructors-as-function.js: Added.
        (test):

        * tests/stress/map-constructor.js:
        (testCallTypeError):
        * tests/stress/promise-cannot-be-called.js:
        (shouldThrow):
        * tests/stress/proxy-basic.js:
        * tests/stress/set-constructor.js:
        * tests/stress/throw-from-ftl-call-ic-slow-path-cells.js:
        (i.catch):
        * tests/stress/throw-from-ftl-call-ic-slow-path-undefined.js:
        (i.catch):
        * tests/stress/throw-from-ftl-call-ic-slow-path.js:
        (i.catch):
        * tests/stress/weak-map-constructor.js:
        (testCallTypeError):
        * tests/stress/weak-set-constructor.js:
        - Updated error message string.

2016-02-23  Alexey Proskuryakov  <ap@apple.com>

        ASan build fix.

        Let's not export a template function that is only used in InspectorBackendDispatcher.cpp.

        * inspector/InspectorBackendDispatcher.h:

2016-02-23  Brian Burg  <bburg@apple.com>

        Connect WebAutomationSession to its backend dispatcher as if it were an agent and add stub implementations
        https://bugs.webkit.org/show_bug.cgi?id=154518
        <rdar://problem/24761096>

        Reviewed by Timothy Hatcher.

        * inspector/InspectorBackendDispatcher.h:
        Export all the classes since they are used by WebKit::WebAutomationSession.

2016-02-22  Brian Burg  <bburg@apple.com>

        Web Inspector: add 'Automation' protocol domain and generate its backend classes separately in WebKit2
        https://bugs.webkit.org/show_bug.cgi?id=154509
        <rdar://problem/24759098>

        Reviewed by Timothy Hatcher.

        Add a new 'WebKit' framework, which is used to generate protocol code
        in WebKit2.

        Add --backend and --frontend flags to the main generator script.
        These allow a framework to trigger two different sets of generators
        so they can be separately generated and compiled.

        * inspector/scripts/codegen/models.py:
        (Framework.fromString):
        (Frameworks): Add new framework.

        * inspector/scripts/generate-inspector-protocol-bindings.py:
        If neither --backend or --frontend is specified, assume both are wanted.
        This matches the behavior for JavaScriptCore and WebInspector frameworks.

        (generate_from_specification):
        Generate C++ files for the backend and Objective-C files for the frontend.

2016-02-22  Saam barati  <sbarati@apple.com>

        JSGlobalObject doesn't visit ProxyObjectStructure during GC
        https://bugs.webkit.org/show_bug.cgi?id=154564

        Rubber stamped by Mark Lam.

        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::visitChildren):

2016-02-22  Saam barati  <sbarati@apple.com>

        InternalFunction::createSubclassStructure doesn't take into account that get() might throw
        https://bugs.webkit.org/show_bug.cgi?id=154548

        Reviewed by Mark Lam and Geoffrey Garen and Andreas Kling.

        InternalFunction::createSubclassStructure calls newTarget.get(...) which can throw 
        an exception. Neither the function nor the call sites of the function took this into
        account. This patch audits the call sites of the function to make it work in
        the event that an exception is thrown.

        * runtime/BooleanConstructor.cpp:
        (JSC::constructWithBooleanConstructor):
        * runtime/DateConstructor.cpp:
        (JSC::constructDate):
        * runtime/ErrorConstructor.cpp:
        (JSC::Interpreter::constructWithErrorConstructor):
        * runtime/FunctionConstructor.cpp:
        (JSC::constructFunctionSkippingEvalEnabledCheck):
        * runtime/InternalFunction.cpp:
        (JSC::InternalFunction::createSubclassStructure):
        * runtime/JSArrayBufferConstructor.cpp:
        (JSC::constructArrayBuffer):
        * runtime/JSGenericTypedArrayViewConstructorInlines.h:
        (JSC::constructGenericTypedArrayView):
        * runtime/JSGlobalObject.h:
        (JSC::constructEmptyArray):
        (JSC::constructArray):
        (JSC::constructArrayNegativeIndexed):
        * runtime/JSPromiseConstructor.cpp:
        (JSC::constructPromise):
        * runtime/MapConstructor.cpp:
        (JSC::constructMap):
        * runtime/NativeErrorConstructor.cpp:
        (JSC::Interpreter::constructWithNativeErrorConstructor):
        * runtime/NumberConstructor.cpp:
        (JSC::constructWithNumberConstructor):
        * runtime/RegExpConstructor.cpp:
        (JSC::getRegExpStructure):
        (JSC::constructRegExp):
        (JSC::constructWithRegExpConstructor):
        * runtime/SetConstructor.cpp:
        (JSC::constructSet):
        * runtime/StringConstructor.cpp:
        (JSC::constructWithStringConstructor):
        (JSC::StringConstructor::getConstructData):
        * runtime/WeakMapConstructor.cpp:
        (JSC::constructWeakMap):
        * runtime/WeakSetConstructor.cpp:
        (JSC::constructWeakSet):
        * tests/stress/create-subclass-structure-might-throw.js: Added.
        (assert):

2016-02-22  Ting-Wei Lan  <lantw44@gmail.com>

        Fix build and implement functions to retrieve registers on FreeBSD
        https://bugs.webkit.org/show_bug.cgi?id=152258

        Reviewed by Michael Catanzaro.

        * heap/MachineStackMarker.cpp:
        (pthreadSignalHandlerSuspendResume):
        struct ucontext is not specified in POSIX and it is not available on
        FreeBSD. Replacing it with ucontext_t fixes the build problem.
        (JSC::MachineThreads::Thread::Registers::stackPointer):
        (JSC::MachineThreads::Thread::Registers::framePointer):
        (JSC::MachineThreads::Thread::Registers::instructionPointer):
        (JSC::MachineThreads::Thread::Registers::llintPC):
        * heap/MachineStackMarker.h:

2016-02-22  Saam barati  <sbarati@apple.com>

        JSValue::isConstructor and JSValue::isFunction should check getConstructData and getCallData
        https://bugs.webkit.org/show_bug.cgi?id=154552

        Reviewed by Mark Lam.

        ES6 Proxy breaks our isFunction() and isConstructor() JSValue methods.
        They return false on a Proxy with internal [[Call]] and [[Construct]]
        properties. It seems safest, most forward looking, and most adherent
        to the specification to check getCallData() and getConstructData() to
        implement these functions.

        * runtime/InternalFunction.cpp:
        (JSC::InternalFunction::createSubclassStructure):
        * runtime/JSCJSValueInlines.h:
        (JSC::JSValue::isFunction):
        (JSC::JSValue::isConstructor):

2016-02-22  Keith Miller  <keith_miller@apple.com>

        Bound functions should use the prototype of the function being bound
        https://bugs.webkit.org/show_bug.cgi?id=154195

        Reviewed by Geoffrey Garen.

        Per ES6, the result of Function.prototype.bind should have the same
        prototype as the the function being bound. In order to avoid creating
        a new structure each time a function is bound we store the new
        structure in our structure map. However, we cannot currently store
        structures that have a different GlobalObject than their prototype.
        In the rare case that the GlobalObject differs or the prototype of
        the bindee is null we create a new structure each time. To further
        minimize new structures, as well as making structure lookup faster,
        we also store the structure in the RareData of the function we
        are binding.

        * runtime/FunctionRareData.cpp:
        (JSC::FunctionRareData::visitChildren):
        * runtime/FunctionRareData.h:
        (JSC::FunctionRareData::getBoundFunctionStructure):
        (JSC::FunctionRareData::setBoundFunctionStructure):
        * runtime/JSBoundFunction.cpp:
        (JSC::getBoundFunctionStructure):
        (JSC::JSBoundFunction::create):
        * tests/es6.yaml:
        * tests/stress/bound-function-uses-prototype.js: Added.
        (testChangeProto.foo):
        (testChangeProto):
        (testBuiltins):
        * tests/stress/class-subclassing-function.js:

2016-02-22  Keith Miller  <keith_miller@apple.com>

        Unreviewed, fix stress test to not print on success.

        * tests/stress/call-apply-builtin-functions-dont-use-iterators.js:
        (catch): Deleted.

2016-02-22  Keith Miller  <keith_miller@apple.com>

        Use Symbol.species in the builtin TypedArray.prototype functions
        https://bugs.webkit.org/show_bug.cgi?id=153384

        Reviewed by Geoffrey Garen.

        This patch adds the use of species constructors to the TypedArray.prototype map and filter
        functions. It also adds a new private function typedArrayGetOriginalConstructor that
        returns the TypedArray constructor used to originally create a TypedArray instance.

        There are no ES6 tests to update for this patch as species creation for these functions is
        not tested in the compatibility table.

        * builtins/TypedArrayPrototype.js:
        (map):
        (filter):
        * bytecode/BytecodeIntrinsicRegistry.cpp:
        (JSC::BytecodeIntrinsicRegistry::BytecodeIntrinsicRegistry):
        * bytecode/BytecodeIntrinsicRegistry.h:
        * runtime/CommonIdentifiers.h:
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        (JSC::JSGlobalObject::visitChildren):
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::typedArrayConstructor):
        * runtime/JSTypedArrayViewPrototype.cpp:
        (JSC::typedArrayViewPrivateFuncGetOriginalConstructor):
        * runtime/JSTypedArrayViewPrototype.h:
        * tests/stress/typedarray-filter.js:
        (subclasses.typedArrays.map):
        (prototype.accept):
        (testSpecies):
        (accept):
        (forEach):
        (subclasses.forEach):
        (testSpeciesRemoveConstructor):
        * tests/stress/typedarray-map.js:
        (subclasses.typedArrays.map):
        (prototype.id):
        (testSpecies):
        (id):
        (forEach):
        (subclasses.forEach):
        (testSpeciesRemoveConstructor):

2016-02-22  Keith Miller  <keith_miller@apple.com>

        Builtins that should not rely on iteration do.
        https://bugs.webkit.org/show_bug.cgi?id=154475

        Reviewed by Geoffrey Garen.

        When changing the behavior of varargs calls to use ES6 iterators the
        call builtin function's use of a varargs call was overlooked. The use
        of iterators is observable outside the scope of the the call function,
        thus it must be reimplemented.

        * builtins/FunctionPrototype.js:
        (call):
        * tests/stress/call-apply-builtin-functions-dont-use-iterators.js: Added.
        (test):
        (addAll):
        (catch):

2016-02-22  Konstantin Tokarev  <annulen@yandex.ru>

        [JSC shell] Don't put empty arguments array to VM.
        https://bugs.webkit.org/show_bug.cgi?id=154516

        Reviewed by Geoffrey Garen.

        This allows arrowfunction-lexical-bind-arguments-top-level test to pass
        in jsc as well as in browser.

        * jsc.cpp:
        (GlobalObject::finishCreation):

2016-02-22  Konstantin Tokarev  <annulen@yandex.ru>

        [cmake] Moved library setup code to WEBKIT_FRAMEWORK macro.
        https://bugs.webkit.org/show_bug.cgi?id=154450

        Reviewed by Alex Christensen.

        * CMakeLists.txt:

2016-02-22  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r196891.
        https://bugs.webkit.org/show_bug.cgi?id=154539

        it broke Production builds (Requested by brrian on #webkit).

        Reverted changeset:

        "Web Inspector: add 'Automation' protocol domain and generate
        its backend classes separately in WebKit2"
        https://bugs.webkit.org/show_bug.cgi?id=154509
        http://trac.webkit.org/changeset/196891

2016-02-21  Joseph Pecoraro  <pecoraro@apple.com>

        CodeBlock always visits its unlinked code twice
        https://bugs.webkit.org/show_bug.cgi?id=154494

        Reviewed by Saam Barati.

        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::visitChildren):
        The unlinked code is always visited in stronglyVisitStrongReferences.

2016-02-21  Brian Burg  <bburg@apple.com>

        Web Inspector: add 'Automation' protocol domain and generate its backend classes separately in WebKit2
        https://bugs.webkit.org/show_bug.cgi?id=154509
        <rdar://problem/24759098>

        Reviewed by Timothy Hatcher.

        Add a new 'WebKit' framework, which is used to generate protocol code
        in WebKit2.

        Add --backend and --frontend flags to the main generator script.
        These allow a framework to trigger two different sets of generators
        so they can be separately generated and compiled.

        * inspector/scripts/codegen/models.py:
        (Framework.fromString):
        (Frameworks): Add new framework.

        * inspector/scripts/generate-inspector-protocol-bindings.py:
        If neither --backend or --frontend is specified, assume both are wanted.
        This matches the behavior for JavaScriptCore and WebInspector frameworks.

        (generate_from_specification):
        Generate C++ files for the backend and Objective-C files for the frontend.

2016-02-21  Sukolsak Sakshuwong  <sukolsak@gmail.com>

        Improvements to Intl code
        https://bugs.webkit.org/show_bug.cgi?id=154486

        Reviewed by Darin Adler.

        This patch does several things:
        - Use std::unique_ptr to store ICU objects.
        - Pass Vector::size() to ICU functions that take a buffer size instead
          of Vector::capacity().
        - If U_SUCCESS(status) is true, it means there is no error, but there
          could be warnings. ICU functions ignore warnings. So, there is no need
          to reset status to U_ZERO_ERROR.
        - Remove the initialization of the String instance variables of
          IntlDateTimeFormat. These values are never read and cause unnecessary
          memory allocation.
        - Fix coding style.
        - Some small optimization.

        * runtime/IntlCollator.cpp:
        (JSC::IntlCollator::UCollatorDeleter::operator()):
        (JSC::IntlCollator::createCollator):
        (JSC::IntlCollator::compareStrings):
        (JSC::IntlCollator::~IntlCollator): Deleted.
        * runtime/IntlCollator.h:
        * runtime/IntlDateTimeFormat.cpp:
        (JSC::IntlDateTimeFormat::UDateFormatDeleter::operator()):
        (JSC::defaultTimeZone):
        (JSC::canonicalizeTimeZoneName):
        (JSC::toDateTimeOptionsAnyDate):
        (JSC::IntlDateTimeFormat::initializeDateTimeFormat):
        (JSC::IntlDateTimeFormat::weekdayString):
        (JSC::IntlDateTimeFormat::format):
        (JSC::IntlDateTimeFormat::~IntlDateTimeFormat): Deleted.
        (JSC::localeData): Deleted.
        * runtime/IntlDateTimeFormat.h:
        * runtime/IntlDateTimeFormatConstructor.cpp:
        * runtime/IntlNumberFormatConstructor.cpp:
        * runtime/IntlObject.cpp:
        (JSC::numberingSystemsForLocale):

2016-02-21  Skachkov Oleksandr  <gskachkov@gmail.com>

        Remove arrowfunction test cases that rely on arguments variable in jsc
        https://bugs.webkit.org/show_bug.cgi?id=154517

        Reviewed by Yusuke Suzuki.

        Allow to jsc has the same behavior in javascript as browser has

        * tests/stress/arrowfunction-lexical-bind-arguments-non-strict-1.js:
        * tests/stress/arrowfunction-lexical-bind-arguments-strict.js:

2016-02-21  Brian Burg  <bburg@apple.com>

        Web Inspector: it should be possible to omit generated code guarded by INSPECTOR_ALTERNATE_DISPATCHERS
        https://bugs.webkit.org/show_bug.cgi?id=154508
        <rdar://problem/24759077>

        Reviewed by Timothy Hatcher.

        In preparation for being able to generate protocol files for WebKit2,
        make it possible to not emit generated code that's guarded by
        ENABLE(INSPECTOR_ALTERNATE_DISPATCHERS). This code is not needed by
        backend dispatchers generated outside of JavaScriptCore. We can't just
        define it to 0 for WebKit2, since it's defined to 1 in <wtf/Platform.h>
        in the configurations where the code is actually used.

        Add a new opt-in Framework configuration option that turns on generating
        this code. Adjust how the code is generated so that it can be easily excluded.

        * inspector/scripts/codegen/cpp_generator_templates.py:
        Make a separate template for the declarations that are guarded.
        Add an initializer expression so the order of initalizers doesn't matter.

        * inspector/scripts/codegen/generate_cpp_backend_dispatcher_header.py:
        (CppBackendDispatcherHeaderGenerator.generate_output): Add a setting check.
        (CppBackendDispatcherHeaderGenerator._generate_dispatcher_declarations_for_domain):
        If the declarations are needed, they will be appended to the end of the
        declarations list.

        * inspector/scripts/codegen/generate_cpp_backend_dispatcher_implementation.py:
        (CppBackendDispatcherImplementationGenerator.generate_output): Add a setting check.
        (CppBackendDispatcherImplementationGenerator._generate_dispatcher_implementation_for_command): Add a setting check.

        * inspector/scripts/codegen/models.py: Set the 'alternate_dispatchers' setting
        to True for Framework.JavaScriptCore only. It's not needed elsewhere.

        Rebaseline affected tests.

        * inspector/scripts/tests/expected/commands-with-async-attribute.json-result:
        * inspector/scripts/tests/expected/commands-with-optional-call-return-parameters.json-result:
        * inspector/scripts/tests/expected/domains-with-varying-command-sizes.json-result:
        * inspector/scripts/tests/expected/enum-values.json-result:
        * inspector/scripts/tests/expected/generate-domains-with-feature-guards.json-result:

2016-02-21  Brian Burg  <bburg@apple.com>

        Web Inspector: clean up generator selection in generate-inspector-protocol-bindings.py
        https://bugs.webkit.org/show_bug.cgi?id=154505
        <rdar://problem/24758042>

        Reviewed by Timothy Hatcher.

        It should be possible to generate code for a framework using some generators
        that other frameworks also use. Right now the generator selection code assumes
        that use of a generator is mutually exclusive among non-test frameworks.

        Make this code explicitly switch on the framework. Reorder generators
        alpabetically within each case.

        * inspector/scripts/generate-inspector-protocol-bindings.py:
        (generate_from_specification):

        Rebaseline tests that are affected by generator reorderings.

        * inspector/scripts/tests/expected/commands-with-async-attribute.json-result:
        * inspector/scripts/tests/expected/commands-with-optional-call-return-parameters.json-result:
        * inspector/scripts/tests/expected/domains-with-varying-command-sizes.json-result:
        * inspector/scripts/tests/expected/enum-values.json-result:
        * inspector/scripts/tests/expected/events-with-optional-parameters.json-result:
        * inspector/scripts/tests/expected/generate-domains-with-feature-guards.json-result:
        * inspector/scripts/tests/expected/same-type-id-different-domain.json-result:
        * inspector/scripts/tests/expected/shadowed-optional-type-setters.json-result:
        * inspector/scripts/tests/expected/type-declaration-aliased-primitive-type.json-result:
        * inspector/scripts/tests/expected/type-declaration-array-type.json-result:
        * inspector/scripts/tests/expected/type-declaration-enum-type.json-result:
        * inspector/scripts/tests/expected/type-declaration-object-type.json-result:
        * inspector/scripts/tests/expected/type-requiring-runtime-casts.json-result:

2016-02-19  Saam Barati  <sbarati@apple.com>

        [ES6] Implement Proxy.[[Construct]]
        https://bugs.webkit.org/show_bug.cgi?id=154440

        Reviewed by Oliver Hunt.

        This patch is mostly an implementation of
        Proxy.[[Construct]] with respect to section 9.5.13
        of the ECMAScript spec.
        https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-construct-argumentslist-newtarget

        This patch also changes op_create_this to accept new.target's
        that aren't JSFunctions. This is necessary implementing Proxy.[[Construct]] 
        because we might construct a JSFunction with a new.target being
        a Proxy. This will also be needed when we implement Reflect.construct.

        * dfg/DFGOperations.cpp:
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * jit/JITOpcodes.cpp:
        (JSC::JIT::emit_op_create_this):
        (JSC::JIT::emitSlow_op_create_this):
        * jit/JITOpcodes32_64.cpp:
        (JSC::JIT::emit_op_create_this):
        (JSC::JIT::emitSlow_op_create_this):
        * llint/LLIntData.cpp:
        (JSC::LLInt::Data::performAssertions):
        * llint/LowLevelInterpreter.asm:
        * llint/LowLevelInterpreter32_64.asm:
        * llint/LowLevelInterpreter64.asm:
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/ProxyObject.cpp:
        (JSC::ProxyObject::finishCreation):
        (JSC::ProxyObject::visitChildren):
        (JSC::performProxyConstruct):
        (JSC::ProxyObject::getConstructData):
        * runtime/ProxyObject.h:
        * tests/es6.yaml:
        * tests/stress/proxy-construct.js: Added.
        (assert):
        (throw.new.Error.let.target):
        (throw.new.Error):
        (assert.let.target):
        (assert.let.handler.get construct):
        (let.target):
        (let.handler.construct):
        (i.catch):
        (assert.let.handler.construct):
        (assert.let.construct):
        (assert.else.assert.let.target):
        (assert.else.assert.let.construct):
        (assert.else.assert):
        (new.proxy.let.target):
        (new.proxy.let.construct):
        (new.proxy):

2016-02-19  Sukolsak Sakshuwong  <sukolsak@gmail.com>

        [INTL] Implement Number Format Functions
        https://bugs.webkit.org/show_bug.cgi?id=147605

        Reviewed by Darin Adler.

        This patch implements Intl.NumberFormat.prototype.format() according
        to the ECMAScript 2015 Internationalization API spec (ECMA-402 2nd edition.)

        * runtime/IntlNumberFormat.cpp:
        (JSC::IntlNumberFormat::UNumberFormatDeleter::operator()):
        (JSC::IntlNumberFormat::initializeNumberFormat):
        (JSC::IntlNumberFormat::createNumberFormat):
        (JSC::IntlNumberFormat::formatNumber):
        (JSC::IntlNumberFormatFuncFormatNumber): Deleted.
        * runtime/IntlNumberFormat.h:
        * runtime/IntlNumberFormatPrototype.cpp:
        (JSC::IntlNumberFormatFuncFormatNumber):

2016-02-18  Gavin Barraclough  <barraclough@apple.com>

        JSObject::getPropertySlot - index-as-propertyname, override on prototype, & shadow
        https://bugs.webkit.org/show_bug.cgi?id=154416

        Reviewed by Geoff Garen.

        Here's the bug. Suppose you call JSObject::getOwnProperty and -
          - PropertyName contains an index,
          - An object on the prototype chain overrides getOwnPropertySlot, and has that index property,
          - The base of the access (or another object on the prototype chain) shadows that property.

        JSObject::getPropertySlot is written assuming the common case is that propertyName is not an
        index, and as such walks up the prototype chain looking for non-index properties before it
        tries calling parseIndex.

        At the point we reach an object on the prototype chain overriding getOwnPropertySlot (which
        would potentially return the property) we may have already skipped over non-overriding
        objects that contain the property in index storage.

        * runtime/JSObject.h:
        (JSC::JSObject::getOwnNonIndexPropertySlot):
            - renamed from inlineGetOwnPropertySlot to better describe behaviour;
              added ASSERT guarding that this method never returns index properties -
              if it ever does, this is unsafe for getPropertySlot.
        (JSC::JSObject::getOwnPropertySlot):
            - inlineGetOwnPropertySlot -> getOwnNonIndexPropertySlot.
        (JSC::JSObject::getPropertySlot):
            - In case of object overriding getOwnPropertySlot check if propertyName is an index.
        (JSC::JSObject::getNonIndexPropertySlot):
            - called by getPropertySlot if we encounter an object that overrides getOwnPropertySlot,
              in order to avoid repeated calls to parseIndex.
        (JSC::JSObject::inlineGetOwnPropertySlot): Deleted.
            - this was renamed to getOwnNonIndexPropertySlot.
        (JSC::JSObject::fastGetOwnPropertySlot): Deleted.
            - this was folded back in to getPropertySlot.

2016-02-19  Saam Barati  <sbarati@apple.com>

        [ES6] Implement Proxy.[[Call]]
        https://bugs.webkit.org/show_bug.cgi?id=154425

        Reviewed by Mark Lam.

        This patch is a straight forward implementation of
        Proxy.[[Call]] with respect to section 9.5.12
        of the ECMAScript spec.
        https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-call-thisargument-argumentslist

        * runtime/ProxyObject.cpp:
        (JSC::ProxyObject::finishCreation):
        (JSC::performProxyGet):
        (JSC::ProxyObject::performInternalMethodGetOwnProperty):
        (JSC::ProxyObject::performHasProperty):
        (JSC::ProxyObject::getOwnPropertySlotByIndex):
        (JSC::performProxyCall):
        (JSC::ProxyObject::getCallData):
        (JSC::ProxyObject::visitChildren):
        * runtime/ProxyObject.h:
        (JSC::ProxyObject::create):
        * tests/es6.yaml:
        * tests/stress/proxy-call.js: Added.
        (assert):
        (throw.new.Error.let.target):
        (throw.new.Error.let.handler.apply):
        (throw.new.Error):
        (assert.let.target):
        (assert.let.handler.get apply):
        (let.target):
        (let.handler.apply):
        (i.catch):
        (assert.let.handler.apply):

2016-02-19  Csaba Osztrogonác  <ossy@webkit.org>

        Remove more LLVM related dead code after r196729
        https://bugs.webkit.org/show_bug.cgi?id=154387

        Reviewed by Filip Pizlo.

        * Configurations/CompileRuntimeToLLVMIR.xcconfig: Removed.
        * Configurations/LLVMForJSC.xcconfig: Removed.
        * JavaScriptCore.vcxproj/libllvmForJSC/libllvmForJSC.props: Removed.
        * JavaScriptCore.vcxproj/libllvmForJSC/libllvmForJSC.vcxproj: Removed.
        * JavaScriptCore.vcxproj/libllvmForJSC/libllvmForJSC.vcxproj.filters: Removed.
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * disassembler/X86Disassembler.cpp:

2016-02-19  Joseph Pecoraro  <pecoraro@apple.com>

        Add isJSString(JSCell*) variant to avoid Cell->JSValue->Cell conversion
        https://bugs.webkit.org/show_bug.cgi?id=154442

        Reviewed by Saam Barati.

        * runtime/JSString.h:
        (JSC::isJSString):

2016-02-19  Joseph Pecoraro  <pecoraro@apple.com>

        Remove unused SymbolTable::createNameScopeTable
        https://bugs.webkit.org/show_bug.cgi?id=154443

        Reviewed by Saam Barati.

        * runtime/SymbolTable.h:

2016-02-18  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Improve the instruction selection of Select
        https://bugs.webkit.org/show_bug.cgi?id=154432

        Reviewed by Filip Pizlo.

        Plenty of code but this patch is pretty dumb:
        -On ARM64: use the 3 operand form of CSEL instead of forcing a source
         to be alised to the destination. This gives more freedom to the register
         allocator and it is one less Move to process per Select.
        -On x86, introduce a fake 3 operands form and use aggressive aliasing
         to try to alias both sources to the destination.

         If aliasing succeed on the "elseCase", the condition of the Select
         is reverted in the MacroAssembler.

         If no aliasing is possible and we end up with 3 registers, the missing
         move instruction is generated by the MacroAssembler.

         The missing move is generated after testing the values because the destination
         can use the same register as one of the test operand.
         Experimental testing seems to indicate there is no macro-fusion on CMOV,
         there is no measurable cost to having the move there.

        * assembler/MacroAssembler.h:
        (JSC::MacroAssembler::isInvertible):
        (JSC::MacroAssembler::invert):
        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::moveConditionallyDouble):
        (JSC::MacroAssemblerARM64::moveConditionallyFloat):
        (JSC::MacroAssemblerARM64::moveConditionallyAfterFloatingPointCompare):
        (JSC::MacroAssemblerARM64::moveConditionally32):
        (JSC::MacroAssemblerARM64::moveConditionally64):
        (JSC::MacroAssemblerARM64::moveConditionallyTest32):
        (JSC::MacroAssemblerARM64::moveConditionallyTest64):
        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::moveConditionallyDouble):
        (JSC::MacroAssemblerX86Common::moveConditionallyFloat):
        (JSC::MacroAssemblerX86Common::moveConditionally32):
        (JSC::MacroAssemblerX86Common::moveConditionallyTest32):
        (JSC::MacroAssemblerX86Common::invert):
        (JSC::MacroAssemblerX86Common::isInvertible):
        * assembler/MacroAssemblerX86_64.h:
        (JSC::MacroAssemblerX86_64::moveConditionally64):
        (JSC::MacroAssemblerX86_64::moveConditionallyTest64):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::createSelect):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/air/AirInstInlines.h:
        (JSC::B3::Air::Inst::shouldTryAliasingDef):
        * b3/air/AirOpcode.opcodes:

2016-02-18  Gyuyoung Kim  <gyuyoung.kim@webkit.org>

        [CMake][GTK] Clean up llvm guard in PlatformGTK.cmake
        https://bugs.webkit.org/show_bug.cgi?id=154430

        Reviewed by Saam Barati.

        llvm isn't used anymore.

        * PlatformGTK.cmake: Remove USE_LLVM_DISASSEMBLER guard.

2016-02-18  Saam Barati  <sbarati@apple.com>

        Implement Proxy.[[HasProperty]]
        https://bugs.webkit.org/show_bug.cgi?id=154313

        Reviewed by Filip Pizlo.

        This patch is a straight forward implementation of
        Proxy.[[HasProperty]] with respect to section 9.5.7
        of the ECMAScript spec.
        https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-hasproperty-p

        * runtime/ProxyObject.cpp:
        (JSC::ProxyObject::performInternalMethodGetOwnProperty):
        (JSC::ProxyObject::performHasProperty):
        (JSC::ProxyObject::getOwnPropertySlotCommon):
        * runtime/ProxyObject.h:
        * tests/es6.yaml:
        * tests/stress/proxy-basic.js:
        (assert):
        (let.handler.has):
        * tests/stress/proxy-has-property.js: Added.
        (assert):
        (throw.new.Error.let.handler.get has):
        (throw.new.Error):
        (assert.let.handler.has):
        (let.handler.has):
        (getOwnPropertyDescriptor):
        (i.catch):

2016-02-18  Saam Barati  <sbarati@apple.com>

        Proxy's don't properly handle Symbols as PropertyKeys.
        https://bugs.webkit.org/show_bug.cgi?id=154385

        Reviewed by Mark Lam and Yusuke Suzuki.

        We were converting all PropertyKeys to strings, even when
        the PropertyName was a Symbol. In the spec, PropertyKeys are
        either a Symbol or a String. We now respect that in Proxy.[[Get]] and
        Proxy.[[GetOwnProperty]].

        * runtime/Completion.cpp:
        (JSC::profiledEvaluate):
        (JSC::createSymbolForEntryPointModule):
        (JSC::identifierToJSValue): Deleted.
        * runtime/Identifier.h:
        (JSC::parseIndex):
        * runtime/IdentifierInlines.h:
        (JSC::Identifier::fromString):
        (JSC::identifierToJSValue):
        (JSC::identifierToSafePublicJSValue):
        * runtime/ProxyObject.cpp:
        (JSC::performProxyGet):
        (JSC::ProxyObject::performInternalMethodGetOwnProperty):
        * tests/es6.yaml:
        * tests/stress/proxy-basic.js:
        (let.handler.getOwnPropertyDescriptor):

2016-02-18  Saam Barati  <sbarati@apple.com>

        Follow up fix to Implement Proxy.[[GetOwnProperty]]
        https://bugs.webkit.org/show_bug.cgi?id=154314

        Reviewed by Filip Pizlo.

        Part of the implementation was broken because
        of how JSObject::getOwnPropertyDescriptor worked.
        I've fixed JSObject::getOwnPropertyDescriptor to
        be able to handle ProxyObject.

        * runtime/JSObject.cpp:
        (JSC::JSObject::getOwnPropertyDescriptor):
        * runtime/ProxyObject.cpp:
        (JSC::ProxyObject::performInternalMethodGetOwnProperty):
        * tests/stress/proxy-get-own-property.js:
        (assert):
        (assert.let.handler.get getOwnPropertyDescriptor):

2016-02-18  Saam Barati  <sbarati@apple.com>

        Implement Proxy.[[GetOwnProperty]]
        https://bugs.webkit.org/show_bug.cgi?id=154314

        Reviewed by Filip Pizlo.

        This patch implements Proxy.[[GetOwnProperty]].
        It's a straight forward implementation as described
        in section 9.5.5 of the specification:
        http://www.ecma-international.org/ecma-262/6.0/index.html#sec-proxy-object-internal-methods-and-internal-slots-getownproperty-p

        * runtime/FunctionPrototype.cpp:
        (JSC::functionProtoFuncBind):
        * runtime/JSObject.cpp:
        (JSC::validateAndApplyPropertyDescriptor):
        (JSC::JSObject::defineOwnNonIndexProperty):
        (JSC::JSObject::defineOwnProperty):
        (JSC::JSObject::getGenericPropertyNames):
        (JSC::JSObject::getMethod):
        * runtime/JSObject.h:
        (JSC::JSObject::butterflyAddress):
        (JSC::makeIdentifier):
        * runtime/ProxyObject.cpp:
        (JSC::performProxyGet):
        (JSC::ProxyObject::performInternalMethodGetOwnProperty):
        (JSC::ProxyObject::getOwnPropertySlotCommon):
        (JSC::ProxyObject::getOwnPropertySlot):
        (JSC::ProxyObject::getOwnPropertySlotByIndex):
        (JSC::ProxyObject::visitChildren):
        * runtime/ProxyObject.h:
        * tests/es6.yaml:
        * tests/stress/proxy-basic.js:
        (let.handler.get null):
        * tests/stress/proxy-get-own-property.js: Added.
        (assert):
        (throw.new.Error.let.handler.getOwnPropertyDescriptor):
        (throw.new.Error):
        (let.handler.getOwnPropertyDescriptor):
        (i.catch):
        (assert.let.handler.getOwnPropertyDescriptor):

2016-02-18  Andreas Kling  <akling@apple.com>

        JSString resolution of substrings should use StringImpl sharing optimization.
        <https://webkit.org/b/154068>
        <rdar://problem/24629358>

        Reviewed by Antti Koivisto.

        When resolving a JSString that's actually a substring of another JSString,
        use the StringImpl sharing optimization to create a new string pointing into
        the parent one, instead of copying out the bytes of the string.

        This dramatically reduces peak memory usage on Gerrit diff viewer pages.

        Another approach to this would be to induce GC far more frequently due to
        the added cost of copying out these substrings. It would reduce the risk
        of prolonging the life of strings only kept alive by substrings.

        This patch chooses to trade that risk for less GC and lower peak memory.

        * runtime/JSString.cpp:
        (JSC::JSRopeString::resolveRope):

2016-02-18  Chris Dumez  <cdumez@apple.com>

        Crash on SES selftest page when loading the page while WebInspector is open
        https://bugs.webkit.org/show_bug.cgi?id=154378
        <rdar://problem/24713422>

        Reviewed by Mark Lam.

        Do a partial revert of r196676 so that JSObject::getOwnPropertyDescriptor()
        returns early again if it detects that getOwnPropertySlot() returns a
        non-own property. This check was removed in r196676 because we assumed that
        only JSDOMWindow::getOwnPropertySlot() could return non-own properties.
        However, as it turns out, DebuggerScope::getOwnPropertySlot() does so as
        well.

        Not having the check would lead to crashes when using the debugger because
        we would get a slot with the CustomAccessor attribute but getDirect() would
        then fail to return the property (because it is not an own property). We
        would then cast the value returned by getDirect() to a CustomGetterSetter*
        and dereference it.

        * runtime/JSObject.cpp:
        (JSC::JSObject::getOwnPropertyDescriptor):

2016-02-18  Filip Pizlo  <fpizlo@apple.com>

        Unreviewed, fix VS build. I didn't know we still did that, but apparently there's a bot
        for that.

        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:

2016-02-18  Filip Pizlo  <fpizlo@apple.com>

        Unreviewed, fix CMake build. This got messed up when rebasing.

        * CMakeLists.txt:

2016-02-18  Csaba Osztrogonác  <ossy@webkit.org>

        Fix the !ENABLE(DFG_JIT) build after r195865
        https://bugs.webkit.org/show_bug.cgi?id=154391

        Reviewed by Filip Pizlo.

        * runtime/SamplingProfiler.cpp:
        (JSC::tryGetBytecodeIndex):

2016-02-17  Filip Pizlo  <fpizlo@apple.com>

        Remove remaining references to LLVM, and make sure comments refer to the backend as "B3" not "LLVM"
        https://bugs.webkit.org/show_bug.cgi?id=154383

        Reviewed by Saam Barati.

        I did a grep -i llvm of all of our code and did one of the following for each occurence:

        - Renamed it to B3. This is appropriate when we were using "LLVM" to mean "the FTL
          backend".

        - Removed the reference because I found it to be dead. In some cases it was a dead
          comment: it was telling us things about what LLVM did and that's just not relevant
          anymore. In other cases it was dead code that I forgot to delete in a previous patch.

        - Edited the comment in some smart way. There were comments talking about what LLVM did
          that were still of interest. In some cases, I added a FIXME to consider changing the
          code below the comment on the grounds that it was written in a weird way to placate
          LLVM and so we can do it better now.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * dfg/DFGArgumentsEliminationPhase.cpp:
        * dfg/DFGOSRAvailabilityAnalysisPhase.h:
        * dfg/DFGPlan.cpp:
        (JSC::DFG::Plan::compileInThread):
        (JSC::DFG::Plan::compileInThreadImpl):
        (JSC::DFG::Plan::compileTimeStats):
        * dfg/DFGPutStackSinkingPhase.cpp:
        * dfg/DFGSSAConversionPhase.h:
        * dfg/DFGStaticExecutionCountEstimationPhase.h:
        * dfg/DFGUnificationPhase.cpp:
        (JSC::DFG::UnificationPhase::run):
        * disassembler/ARM64Disassembler.cpp:
        (JSC::tryToDisassemble): Deleted.
        * disassembler/X86Disassembler.cpp:
        (JSC::tryToDisassemble):
        * ftl/FTLAbstractHeap.cpp:
        (JSC::FTL::IndexedAbstractHeap::initialize):
        * ftl/FTLAbstractHeap.h:
        * ftl/FTLFormattedValue.h:
        * ftl/FTLJITFinalizer.cpp:
        (JSC::FTL::JITFinalizer::finalizeFunction):
        * ftl/FTLLink.cpp:
        (JSC::FTL::link):
        * ftl/FTLLocation.cpp:
        (JSC::FTL::Location::restoreInto):
        * ftl/FTLLowerDFGToB3.cpp: Copied from Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.cpp.
        (JSC::FTL::DFG::ftlUnreachable):
        (JSC::FTL::DFG::LowerDFGToB3::LowerDFGToB3):
        (JSC::FTL::DFG::LowerDFGToB3::compileBlock):
        (JSC::FTL::DFG::LowerDFGToB3::compileArithNegate):
        (JSC::FTL::DFG::LowerDFGToB3::compileMultiGetByOffset):
        (JSC::FTL::DFG::LowerDFGToB3::compileOverridesHasInstance):
        (JSC::FTL::DFG::LowerDFGToB3::isBoolean):
        (JSC::FTL::DFG::LowerDFGToB3::unboxBoolean):
        (JSC::FTL::DFG::LowerDFGToB3::emitStoreBarrier):
        (JSC::FTL::lowerDFGToB3):
        (JSC::FTL::DFG::LowerDFGToLLVM::LowerDFGToLLVM): Deleted.
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBlock): Deleted.
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithNegate): Deleted.
        (JSC::FTL::DFG::LowerDFGToLLVM::compileMultiGetByOffset): Deleted.
        (JSC::FTL::DFG::LowerDFGToLLVM::compileOverridesHasInstance): Deleted.
        (JSC::FTL::DFG::LowerDFGToLLVM::isBoolean): Deleted.
        (JSC::FTL::DFG::LowerDFGToLLVM::unboxBoolean): Deleted.
        (JSC::FTL::DFG::LowerDFGToLLVM::emitStoreBarrier): Deleted.
        (JSC::FTL::lowerDFGToLLVM): Deleted.
        * ftl/FTLLowerDFGToB3.h: Copied from Source/JavaScriptCore/ftl/FTLLowerDFGToLLVM.h.
        * ftl/FTLLowerDFGToLLVM.cpp: Removed.
        * ftl/FTLLowerDFGToLLVM.h: Removed.
        * ftl/FTLOSRExitCompiler.cpp:
        (JSC::FTL::compileStub):
        * ftl/FTLWeight.h:
        (JSC::FTL::Weight::frequencyClass):
        (JSC::FTL::Weight::inverse):
        (JSC::FTL::Weight::scaleToTotal): Deleted.
        * ftl/FTLWeightedTarget.h:
        (JSC::FTL::rarely):
        (JSC::FTL::unsure):
        * jit/CallFrameShuffler64.cpp:
        (JSC::CallFrameShuffler::emitDisplace):
        * jit/RegisterSet.cpp:
        (JSC::RegisterSet::ftlCalleeSaveRegisters):
        * llvm: Removed.
        * llvm/InitializeLLVMLinux.cpp: Removed.
        * llvm/InitializeLLVMWin.cpp: Removed.
        * llvm/library: Removed.
        * llvm/library/LLVMTrapCallback.h: Removed.
        * llvm/library/libllvmForJSC.version: Removed.
        * runtime/Options.cpp:
        (JSC::recomputeDependentOptions):
        (JSC::Options::initialize):
        * runtime/Options.h:
        * wasm/WASMFunctionB3IRGenerator.h: Copied from Source/JavaScriptCore/wasm/WASMFunctionLLVMIRGenerator.h.
        * wasm/WASMFunctionLLVMIRGenerator.h: Removed.
        * wasm/WASMFunctionParser.cpp:

2016-02-18  Csaba Osztrogonác  <ossy@webkit.org>

        [cmake] Build system cleanup
        https://bugs.webkit.org/show_bug.cgi?id=154337

        Reviewed by Žan Doberšek.

        * CMakeLists.txt:

2016-02-17  Mark Lam  <mark.lam@apple.com>

        Callers of JSString::value() should check for exceptions thereafter.
        https://bugs.webkit.org/show_bug.cgi?id=154346

        Reviewed by Geoffrey Garen.

        JSString::value() can throw an exception if the JS string is a rope and value() 
        needs to resolve the rope but encounters an OutOfMemory error.  If value() is not
        able to resolve the rope, it will return a null string (in addition to throwing
        the exception).  If a caller does not check for exceptions after calling
        JSString::value(), they may eventually use the returned null string and crash the
        VM.

        The fix is to add all the necessary exception checks, and do the appropriate
        handling if needed.

        * jsc.cpp:
        (functionRun):
        (functionLoad):
        (functionReadFile):
        (functionCheckSyntax):
        (functionLoadWebAssembly):
        (functionLoadModule):
        (functionCheckModuleSyntax):
        * runtime/DateConstructor.cpp:
        (JSC::dateParse):
        (JSC::dateNow):
        * runtime/JSGlobalObjectFunctions.cpp:
        (JSC::globalFuncEval):
        * tools/JSDollarVMPrototype.cpp:
        (JSC::functionPrint):

2016-02-17  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] ARM64: Support the immediate format used for bit operations in Air
        https://bugs.webkit.org/show_bug.cgi?id=154327

        Reviewed by Filip Pizlo.

        ARM64 supports a pretty rich form of immediates for bit operation.
        There are two formats used to encode repeating patterns and common
        input in a dense form.

        In this patch, I add 2 new type of Arg: BitImm32 and BitImm64.
        Those represents the valid immediate forms for bit operation.
        On x86, any 32bits value is valid. On ARM64, all the encoding
        form are tried and the immediate is used when possible.

        The arg type Imm64 is renamed to BigImm to better represent what
        it is: an immediate that does not fit into Imm.

        * assembler/ARM64Assembler.h:
        (JSC::LogicalImmediate::create32): Deleted.
        (JSC::LogicalImmediate::create64): Deleted.
        (JSC::LogicalImmediate::value): Deleted.
        (JSC::LogicalImmediate::isValid): Deleted.
        (JSC::LogicalImmediate::is64bit): Deleted.
        (JSC::LogicalImmediate::LogicalImmediate): Deleted.
        (JSC::LogicalImmediate::mask): Deleted.
        (JSC::LogicalImmediate::partialHSB): Deleted.
        (JSC::LogicalImmediate::highestSetBit): Deleted.
        (JSC::LogicalImmediate::findBitRange): Deleted.
        (JSC::LogicalImmediate::encodeLogicalImmediate): Deleted.
        * assembler/AssemblerCommon.h:
        (JSC::ARM64LogicalImmediate::create32):
        (JSC::ARM64LogicalImmediate::create64):
        (JSC::ARM64LogicalImmediate::value):
        (JSC::ARM64LogicalImmediate::isValid):
        (JSC::ARM64LogicalImmediate::is64bit):
        (JSC::ARM64LogicalImmediate::ARM64LogicalImmediate):
        (JSC::ARM64LogicalImmediate::mask):
        (JSC::ARM64LogicalImmediate::partialHSB):
        (JSC::ARM64LogicalImmediate::highestSetBit):
        (JSC::ARM64LogicalImmediate::findBitRange):
        (JSC::ARM64LogicalImmediate::encodeLogicalImmediate):
        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::and64):
        (JSC::MacroAssemblerARM64::or64):
        (JSC::MacroAssemblerARM64::xor64):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::bitImm):
        (JSC::B3::Air::LowerToAir::bitImm64):
        (JSC::B3::Air::LowerToAir::appendBinOp):
        * b3/air/AirArg.cpp:
        (JSC::B3::Air::Arg::dump):
        (WTF::printInternal):
        * b3/air/AirArg.h:
        (JSC::B3::Air::Arg::bitImm):
        (JSC::B3::Air::Arg::bitImm64):
        (JSC::B3::Air::Arg::isBitImm):
        (JSC::B3::Air::Arg::isBitImm64):
        (JSC::B3::Air::Arg::isSomeImm):
        (JSC::B3::Air::Arg::value):
        (JSC::B3::Air::Arg::isGP):
        (JSC::B3::Air::Arg::isFP):
        (JSC::B3::Air::Arg::hasType):
        (JSC::B3::Air::Arg::isValidBitImmForm):
        (JSC::B3::Air::Arg::isValidBitImm64Form):
        (JSC::B3::Air::Arg::isValidForm):
        (JSC::B3::Air::Arg::asTrustedImm32):
        (JSC::B3::Air::Arg::asTrustedImm64):
        * b3/air/AirOpcode.opcodes:
        * b3/air/opcode_generator.rb:

2016-02-17  Keith Miller  <keith_miller@apple.com>

        Spread operator should be allowed when not the first argument of parameter list
        https://bugs.webkit.org/show_bug.cgi?id=152721

        Reviewed by Saam Barati.

        Spread arguments to functions should now be ES6 compliant. Before we
        would only take a spread operator if it was the sole argument to a
        function. Additionally, we would not use the Symbol.iterator on the
        object to generate the arguments. Instead we would do a loop up to the
        length mapping indexed properties to the corresponding argument. We fix
        both these issues by doing an AST transformation from foo(...a, b, ...c, d)
        to foo(...[...a, b, ...c, d]) (where the spread on the rhs uses the
        old spread semantics). This solution has the downside of requiring the
        allocation of another object and copying each element twice but avoids a
        large change to the vm calling convention.

        * interpreter/Interpreter.cpp:
        (JSC::loadVarargs):
        * parser/ASTBuilder.h:
        (JSC::ASTBuilder::createElementList):
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseArguments):
        (JSC::Parser<LexerType>::parseArgument):
        (JSC::Parser<LexerType>::parseMemberExpression):
        * parser/Parser.h:
        * parser/SyntaxChecker.h:
        (JSC::SyntaxChecker::createElementList):
        * tests/es6.yaml:
        * tests/stress/spread-calling.js: Added.
        (testFunction):
        (testEmpty):
        (makeObject):
        (otherIterator.return.next):
        (otherIterator):
        (totalIter):
        (throwingIter.return.next):
        (throwingIter):
        (i.catch):

2016-02-17  Brian Burg  <bburg@apple.com>

        Remove a wrong cast in RemoteInspector::receivedSetupMessage
        https://bugs.webkit.org/show_bug.cgi?id=154361
        <rdar://problem/24709281>

        Reviewed by Joseph Pecoraro.

        * inspector/remote/RemoteInspector.mm:
        (Inspector::RemoteInspector::receivedSetupMessage):
        Not only is this cast unnecessary (the constructor accepts the base class),
        but it is wrong since the target could be an automation target. Remove it.

2016-02-17  Filip Pizlo  <fpizlo@apple.com>

        Rename FTLB3Blah to FTLBlah
        https://bugs.webkit.org/show_bug.cgi?id=154365

        Rubber stamped by Geoffrey Garen, Benjamin Poulain, Awesome Kling, and Saam Barati.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * ftl/FTLB3Compile.cpp: Removed.
        * ftl/FTLB3Output.cpp: Removed.
        * ftl/FTLB3Output.h: Removed.
        * ftl/FTLCompile.cpp: Copied from Source/JavaScriptCore/ftl/FTLB3Compile.cpp.
        * ftl/FTLOutput.cpp: Copied from Source/JavaScriptCore/ftl/FTLB3Output.cpp.
        * ftl/FTLOutput.h: Copied from Source/JavaScriptCore/ftl/FTLB3Output.h.

2016-02-17  Filip Pizlo  <fpizlo@apple.com>

        Remove LLVM dependencies from WebKit
        https://bugs.webkit.org/show_bug.cgi?id=154323

        Reviewed by Antti Koivisto and Benjamin Poulain.

        We have switched all ports that use the FTL JIT to using B3 as the backend. This renders all
        LLVM-related code dead, including the disassembler, which was only reachable when you were on
        a platform that already had an in-tree disassembler.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * dfg/DFGCommon.h:
        * dfg/DFGPlan.cpp:
        (JSC::DFG::Plan::compileInThread):
        (JSC::DFG::Plan::compileInThreadImpl):
        (JSC::DFG::Plan::compileTimeStats):
        * disassembler/ARM64Disassembler.cpp:
        (JSC::tryToDisassemble):
        * disassembler/ARMv7Disassembler.cpp:
        (JSC::tryToDisassemble):
        * disassembler/Disassembler.cpp:
        (JSC::disassemble):
        (JSC::disassembleAsynchronously):
        * disassembler/Disassembler.h:
        (JSC::tryToDisassemble):
        * disassembler/LLVMDisassembler.cpp: Removed.
        * disassembler/LLVMDisassembler.h: Removed.
        * disassembler/UDis86Disassembler.cpp:
        (JSC::tryToDisassembleWithUDis86):
        * disassembler/UDis86Disassembler.h:
        (JSC::tryToDisassembleWithUDis86):
        * disassembler/X86Disassembler.cpp:
        (JSC::tryToDisassemble):
        * ftl/FTLAbbreviatedTypes.h:
        * ftl/FTLAbbreviations.h: Removed.
        * ftl/FTLAbstractHeap.cpp:
        (JSC::FTL::AbstractHeap::decorateInstruction):
        (JSC::FTL::AbstractHeap::dump):
        (JSC::FTL::AbstractField::dump):
        (JSC::FTL::IndexedAbstractHeap::IndexedAbstractHeap):
        (JSC::FTL::IndexedAbstractHeap::~IndexedAbstractHeap):
        (JSC::FTL::IndexedAbstractHeap::baseIndex):
        (JSC::FTL::IndexedAbstractHeap::dump):
        (JSC::FTL::NumberedAbstractHeap::NumberedAbstractHeap):
        (JSC::FTL::NumberedAbstractHeap::dump):
        (JSC::FTL::AbsoluteAbstractHeap::AbsoluteAbstractHeap):
        (JSC::FTL::AbstractHeap::tbaaMetadataSlow): Deleted.
        * ftl/FTLAbstractHeap.h:
        (JSC::FTL::AbstractHeap::AbstractHeap):
        (JSC::FTL::AbstractHeap::heapName):
        (JSC::FTL::IndexedAbstractHeap::atAnyIndex):
        (JSC::FTL::NumberedAbstractHeap::atAnyNumber):
        (JSC::FTL::AbsoluteAbstractHeap::atAnyAddress):
        (JSC::FTL::AbstractHeap::tbaaMetadata): Deleted.
        * ftl/FTLAbstractHeapRepository.cpp:
        (JSC::FTL::AbstractHeapRepository::AbstractHeapRepository):
        * ftl/FTLAbstractHeapRepository.h:
        * ftl/FTLB3Compile.cpp:
        * ftl/FTLB3Output.cpp:
        (JSC::FTL::Output::Output):
        (JSC::FTL::Output::check):
        (JSC::FTL::Output::load):
        (JSC::FTL::Output::store):
        * ftl/FTLB3Output.h:
        * ftl/FTLCommonValues.cpp:
        (JSC::FTL::CommonValues::CommonValues):
        (JSC::FTL::CommonValues::initializeConstants):
        * ftl/FTLCommonValues.h:
        (JSC::FTL::CommonValues::initialize): Deleted.
        * ftl/FTLCompile.cpp: Removed.
        * ftl/FTLCompileBinaryOp.cpp: Removed.
        * ftl/FTLCompileBinaryOp.h: Removed.
        * ftl/FTLDWARFDebugLineInfo.cpp: Removed.
        * ftl/FTLDWARFDebugLineInfo.h: Removed.
        * ftl/FTLDWARFRegister.cpp: Removed.
        * ftl/FTLDWARFRegister.h: Removed.
        * ftl/FTLDataSection.cpp: Removed.
        * ftl/FTLDataSection.h: Removed.
        * ftl/FTLExceptionHandlerManager.cpp: Removed.
        * ftl/FTLExceptionHandlerManager.h: Removed.
        * ftl/FTLExceptionTarget.cpp:
        * ftl/FTLExceptionTarget.h:
        * ftl/FTLExitThunkGenerator.cpp: Removed.
        * ftl/FTLExitThunkGenerator.h: Removed.
        * ftl/FTLFail.cpp:
        (JSC::FTL::fail):
        * ftl/FTLInlineCacheDescriptor.h: Removed.
        * ftl/FTLInlineCacheSize.cpp: Removed.
        * ftl/FTLInlineCacheSize.h: Removed.
        * ftl/FTLIntrinsicRepository.cpp: Removed.
        * ftl/FTLIntrinsicRepository.h: Removed.
        * ftl/FTLJITCode.cpp:
        (JSC::FTL::JITCode::~JITCode):
        (JSC::FTL::JITCode::initializeB3Code):
        (JSC::FTL::JITCode::initializeB3Byproducts):
        (JSC::FTL::JITCode::initializeAddressForCall):
        (JSC::FTL::JITCode::contains):
        (JSC::FTL::JITCode::ftl):
        (JSC::FTL::JITCode::liveRegistersToPreserveAtExceptionHandlingCallSite):
        (JSC::FTL::JITCode::initializeExitThunks): Deleted.
        (JSC::FTL::JITCode::addHandle): Deleted.
        (JSC::FTL::JITCode::addDataSection): Deleted.
        (JSC::FTL::JITCode::exitThunks): Deleted.
        * ftl/FTLJITCode.h:
        (JSC::FTL::JITCode::b3Code):
        (JSC::FTL::JITCode::handles): Deleted.
        (JSC::FTL::JITCode::dataSections): Deleted.
        * ftl/FTLJITFinalizer.cpp:
        (JSC::FTL::JITFinalizer::codeSize):
        (JSC::FTL::JITFinalizer::finalizeFunction):
        * ftl/FTLJITFinalizer.h:
        * ftl/FTLJSCall.cpp: Removed.
        * ftl/FTLJSCall.h: Removed.
        * ftl/FTLJSCallBase.cpp: Removed.
        * ftl/FTLJSCallBase.h: Removed.
        * ftl/FTLJSCallVarargs.cpp: Removed.
        * ftl/FTLJSCallVarargs.h: Removed.
        * ftl/FTLJSTailCall.cpp: Removed.
        * ftl/FTLJSTailCall.h: Removed.
        * ftl/FTLLazySlowPath.cpp:
        (JSC::FTL::LazySlowPath::LazySlowPath):
        (JSC::FTL::LazySlowPath::generate):
        * ftl/FTLLazySlowPath.h:
        (JSC::FTL::LazySlowPath::createGenerator):
        (JSC::FTL::LazySlowPath::patchableJump):
        (JSC::FTL::LazySlowPath::done):
        (JSC::FTL::LazySlowPath::usedRegisters):
        (JSC::FTL::LazySlowPath::callSiteIndex):
        (JSC::FTL::LazySlowPath::stub):
        (JSC::FTL::LazySlowPath::patchpoint): Deleted.
        * ftl/FTLLink.cpp:
        (JSC::FTL::link):
        * ftl/FTLLocation.cpp:
        (JSC::FTL::Location::forValueRep):
        (JSC::FTL::Location::dump):
        (JSC::FTL::Location::forStackmaps): Deleted.
        * ftl/FTLLocation.h:
        (JSC::FTL::Location::forRegister):
        (JSC::FTL::Location::forIndirect):
        (JSC::FTL::Location::forConstant):
        (JSC::FTL::Location::kind):
        (JSC::FTL::Location::hasReg):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::LowerDFGToLLVM):
        (JSC::FTL::DFG::LowerDFGToLLVM::lower):
        (JSC::FTL::DFG::LowerDFGToLLVM::createPhiVariables):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNode):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileUpsilon):
        (JSC::FTL::DFG::LowerDFGToLLVM::compilePhi):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileDoubleConstant):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileValueAdd):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileStrCat):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithAddOrSub):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithMul):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithDiv):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithNegate):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBitAnd):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBitOr):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBitXor):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBitRShift):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBitLShift):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBitURShift):
        (JSC::FTL::DFG::LowerDFGToLLVM::compilePutById):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileGetButterfly):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileMakeRope):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCallOrConstruct):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileTailCall):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCallOrConstructVarargs):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileLoadVarargs):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileInvalidationPoint):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileIsUndefined):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileIn):
        (JSC::FTL::DFG::LowerDFGToLLVM::getById):
        (JSC::FTL::DFG::LowerDFGToLLVM::loadButterflyWithBarrier):
        (JSC::FTL::DFG::LowerDFGToLLVM::stringsEqual):
        (JSC::FTL::DFG::LowerDFGToLLVM::emitRightShiftSnippet):
        (JSC::FTL::DFG::LowerDFGToLLVM::allocateCell):
        (JSC::FTL::DFG::LowerDFGToLLVM::lazySlowPath):
        (JSC::FTL::DFG::LowerDFGToLLVM::speculate):
        (JSC::FTL::DFG::LowerDFGToLLVM::callCheck):
        (JSC::FTL::DFG::LowerDFGToLLVM::preparePatchpointForExceptions):
        (JSC::FTL::DFG::LowerDFGToLLVM::lowBlock):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExitDescriptor):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExit):
        (JSC::FTL::DFG::LowerDFGToLLVM::blessSpeculation):
        (JSC::FTL::DFG::LowerDFGToLLVM::buildExitArguments):
        (JSC::FTL::DFG::LowerDFGToLLVM::exitValueForAvailability):
        (JSC::FTL::DFG::LowerDFGToLLVM::exitValueForNode):
        (JSC::FTL::DFG::LowerDFGToLLVM::probe):
        (JSC::FTL::DFG::LowerDFGToLLVM::crash):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileUntypedBinaryOp): Deleted.
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExitArgumentsForPatchpointIfWillCatchException): Deleted.
        (JSC::FTL::DFG::LowerDFGToLLVM::emitOSRExitCall): Deleted.
        (JSC::FTL::DFG::LowerDFGToLLVM::callStackmap): Deleted.
        * ftl/FTLOSRExit.cpp:
        (JSC::FTL::OSRExitDescriptor::OSRExitDescriptor):
        (JSC::FTL::OSRExitDescriptor::validateReferences):
        (JSC::FTL::OSRExitDescriptor::emitOSRExit):
        (JSC::FTL::OSRExitDescriptor::prepareOSRExitHandle):
        (JSC::FTL::OSRExit::OSRExit):
        (JSC::FTL::OSRExit::codeLocationForRepatch):
        (JSC::FTL::OSRExit::gatherRegistersToSpillForCallIfException): Deleted.
        (JSC::FTL::OSRExit::spillRegistersToSpillSlot): Deleted.
        (JSC::FTL::OSRExit::recoverRegistersFromSpillSlot): Deleted.
        (JSC::FTL::OSRExit::willArriveAtExitFromIndirectExceptionCheck): Deleted.
        (JSC::FTL::OSRExit::willArriveAtOSRExitFromCallOperation): Deleted.
        (JSC::FTL::OSRExit::needsRegisterRecoveryOnGenericUnwindOSRExitPath): Deleted.
        * ftl/FTLOSRExit.h:
        (JSC::FTL::OSRExit::considerAddingAsFrequentExitSite):
        (JSC::FTL::OSRExitDescriptorImpl::OSRExitDescriptorImpl): Deleted.
        * ftl/FTLOSRExitCompilationInfo.h: Removed.
        * ftl/FTLOSRExitCompiler.cpp:
        (JSC::FTL::compileRecovery):
        (JSC::FTL::compileStub):
        (JSC::FTL::compileFTLOSRExit):
        * ftl/FTLOSRExitHandle.cpp:
        * ftl/FTLOSRExitHandle.h:
        * ftl/FTLOutput.cpp: Removed.
        * ftl/FTLOutput.h: Removed.
        * ftl/FTLPatchpointExceptionHandle.cpp:
        * ftl/FTLPatchpointExceptionHandle.h:
        * ftl/FTLStackMaps.cpp: Removed.
        * ftl/FTLStackMaps.h: Removed.
        * ftl/FTLState.cpp:
        (JSC::FTL::State::State):
        (JSC::FTL::State::~State):
        (JSC::FTL::State::dumpState): Deleted.
        * ftl/FTLState.h:
        * ftl/FTLUnwindInfo.cpp: Removed.
        * ftl/FTLUnwindInfo.h: Removed.
        * ftl/FTLValueRange.cpp:
        (JSC::FTL::ValueRange::decorateInstruction):
        * ftl/FTLValueRange.h:
        (JSC::FTL::ValueRange::ValueRange):
        (JSC::FTL::ValueRange::begin):
        (JSC::FTL::ValueRange::end):
        * ftl/FTLWeight.h:
        (JSC::FTL::Weight::value):
        (JSC::FTL::Weight::frequencyClass):
        (JSC::FTL::Weight::scaleToTotal):
        * llvm/InitializeLLVM.cpp: Removed.
        * llvm/InitializeLLVM.h: Removed.
        * llvm/InitializeLLVMMac.cpp: Removed.
        * llvm/InitializeLLVMPOSIX.cpp: Removed.
        * llvm/InitializeLLVMPOSIX.h: Removed.
        * llvm/LLVMAPI.cpp: Removed.
        * llvm/LLVMAPI.h: Removed.
        * llvm/LLVMAPIFunctions.h: Removed.
        * llvm/LLVMHeaders.h: Removed.
        * llvm/library/LLVMAnchor.cpp: Removed.
        * llvm/library/LLVMExports.cpp: Removed.
        * llvm/library/LLVMOverrides.cpp: Removed.
        * llvm/library/config_llvm.h: Removed.

2016-02-17  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Remove the overflow check on ArithAbs when possible
        https://bugs.webkit.org/show_bug.cgi?id=154325

        Reviewed by Filip Pizlo.

        This patch adds support for ArithMode for ArithAbs.

        It is useful for kraken tests where Math.abs() is used
        on values for which the range is known.

        For example, imaging-gaussian-blur has two Math.abs() with
        integers that are always in a small range around zero.
        The IntegerRangeOptimizationPhase detects the range correctly
        so we can just update the ArithMode depending on the input.

        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGIntegerRangeOptimizationPhase.cpp:
        * dfg/DFGNode.h:
        (JSC::DFG::Node::convertToArithNegate):
        (JSC::DFG::Node::hasArithMode):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithAbs):
        * tests/stress/arith-abs-integer-range-optimization.js: Added.
        (negativeRange):
        (negativeRangeIncludingZero):
        (negativeRangeWithOverflow):
        (positiveRange):
        (positiveRangeIncludingZero):
        (rangeWithoutOverflow):
        * tests/stress/arith-abs-with-bitwise-or-zero.js: Added.
        (opaqueAbs):

2016-02-17  Chris Dumez  <cdumez@apple.com>

        SES selftest page crashes on nightly r196694
        https://bugs.webkit.org/show_bug.cgi?id=154350
        <rdar://problem/24704334>

        Reviewed by Mark Lam.

        SES selftest page crashes after r196001 / r196145 when calling
        Object.getOwnPropertyDescriptor(window, "length") after the window
        has been reified and "length" has been shadowed by a value property.

        It was crashing in JSObject::getOwnPropertyDescriptor() because
        we are getting a slot that has attribute "CustomAccessor" but
        the property is not a CustomGetterSetter. In this case, since
        window.length is [Replaceable] and has been set to a numeric value,
        it makes that the property is not a CustomGetterSetter. However,
        the "CustomAccessor" attribute should have been dropped from the
        slot when window.length was shadowed. Therefore, this code path
        should not be exercised at all when calling
        getOwnPropertyDescriptor().

        The issue was that putDirectInternal() was updating the slot
        attributes only if the "Accessor" flag has changed, but not
        the "customAccessor" flag. This patch fixes the issue.

        * runtime/JSObject.h:
        (JSC::JSObject::putDirectInternal):

2016-02-17  Saam barati  <sbarati@apple.com>

        Implement Proxy [[Get]]
        https://bugs.webkit.org/show_bug.cgi?id=154081

        Reviewed by Michael Saboff.

        This patch implements ProxyObject and ProxyConstructor. Their
        implementations are straight forward and follow the spec.
        The largest change in this patch is adding a second parameter
        to PropertySlot's constructor that specifies the internal method type of
        the getOwnPropertySlot inquiry. We use getOwnPropertySlot to 
        implement more than one Internal Method in the spec. Because 
        of this, we need InternalMethodType to give us context about 
        which Internal Method we're executing. Specifically, Proxy will 
        call into different handlers based on this information.

        InternalMethodType is an enum with the following values:
        - Get
          This corresponds to [[Get]] internal method in the spec.
        - GetOwnProperty
          This corresponds to [[GetOwnProperty]] internal method in the spec.
        - HasProperty
          This corresponds to [[HasProperty]] internal method in the spec.
        - VMInquiry
          This is basically everything else that isn't one of the above
          types. This value also mandates that getOwnPropertySlot does
          not perform any user observable effects. I.e, it can't call
          a JS function.

        The other non-VMInquiry InternalMethodTypes are allowed to perform user
        observable effects. I.e, in future patches, ProxyObject will implement
        InternalMethodType::HasProperty and InternalMethodType::GetOwnProperty, which will both be defined
        to call user defined JS functions, which clearly have the right to perform
        user observable effects.

        This patch implements getOwnPropertySlot of ProxyObject under
        InternalMethodType::Get. 

        * API/JSCallbackObjectFunctions.h:
        (JSC::JSCallbackObject<Parent>::put):
        (JSC::JSCallbackObject<Parent>::staticFunctionGetter):
        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * debugger/DebuggerScope.cpp:
        (JSC::DebuggerScope::caughtValue):
        * interpreter/Interpreter.cpp:
        (JSC::Interpreter::execute):
        * jit/JITOperations.cpp:
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
        * runtime/ArrayPrototype.cpp:
        (JSC::getProperty):
        * runtime/CommonIdentifiers.h:
        * runtime/JSCJSValueInlines.h:
        (JSC::JSValue::get):
        * runtime/JSFunction.cpp:
        (JSC::JSFunction::getOwnNonIndexPropertyNames):
        (JSC::JSFunction::put):
        (JSC::JSFunction::defineOwnProperty):
        * runtime/JSGenericTypedArrayViewConstructorInlines.h:
        (JSC::constructGenericTypedArrayViewWithArguments):
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        (JSC::JSGlobalObject::defineOwnProperty):
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::regExpMatchesArrayStructure):
        (JSC::JSGlobalObject::moduleRecordStructure):
        (JSC::JSGlobalObject::moduleNamespaceObjectStructure):
        (JSC::JSGlobalObject::proxyObjectStructure):
        (JSC::JSGlobalObject::wasmModuleStructure):
        * runtime/JSModuleEnvironment.cpp:
        (JSC::JSModuleEnvironment::getOwnPropertySlot):
        * runtime/JSModuleNamespaceObject.cpp:
        (JSC::callbackGetter):
        * runtime/JSONObject.cpp:
        (JSC::Stringifier::Holder::appendNextProperty):
        (JSC::Walker::walk):
        * runtime/JSObject.cpp:
        (JSC::JSObject::calculatedClassName):
        (JSC::JSObject::putDirectNonIndexAccessor):
        (JSC::JSObject::hasProperty):
        (JSC::JSObject::deleteProperty):
        (JSC::JSObject::hasOwnProperty):
        (JSC::JSObject::getOwnPropertyDescriptor):
        * runtime/JSObject.h:
        (JSC::JSObject::getDirectIndex):
        (JSC::JSObject::get):
        * runtime/JSScope.cpp:
        (JSC::abstractAccess):
        * runtime/ObjectConstructor.cpp:
        (JSC::toPropertyDescriptor):
        * runtime/ObjectPrototype.cpp:
        (JSC::objectProtoFuncLookupGetter):
        (JSC::objectProtoFuncLookupSetter):
        (JSC::objectProtoFuncToString):
        * runtime/PropertySlot.h:
        (JSC::attributesForStructure):
        (JSC::PropertySlot::PropertySlot):
        (JSC::PropertySlot::isCacheableGetter):
        (JSC::PropertySlot::isCacheableCustom):
        (JSC::PropertySlot::internalMethodType):
        (JSC::PropertySlot::disableCaching):
        (JSC::PropertySlot::getValue):
        * runtime/ProxyConstructor.cpp: Added.
        (JSC::ProxyConstructor::create):
        (JSC::ProxyConstructor::ProxyConstructor):
        (JSC::ProxyConstructor::finishCreation):
        (JSC::constructProxyObject):
        (JSC::ProxyConstructor::getConstructData):
        (JSC::ProxyConstructor::getCallData):
        * runtime/ProxyConstructor.h: Added.
        (JSC::ProxyConstructor::createStructure):
        * runtime/ProxyObject.cpp: Added.
        (JSC::ProxyObject::ProxyObject):
        (JSC::ProxyObject::finishCreation):
        (JSC::performProxyGet):
        (JSC::ProxyObject::getOwnPropertySlotCommon):
        (JSC::ProxyObject::getOwnPropertySlot):
        (JSC::ProxyObject::getOwnPropertySlotByIndex):
        (JSC::ProxyObject::visitChildren):
        * runtime/ProxyObject.h: Added.
        (JSC::ProxyObject::create):
        (JSC::ProxyObject::createStructure):
        (JSC::ProxyObject::target):
        (JSC::ProxyObject::handler):
        * runtime/ReflectObject.cpp:
        (JSC::reflectObjectGet):
        * runtime/SamplingProfiler.cpp:
        (JSC::SamplingProfiler::StackFrame::nameFromCallee):
        * tests/es6.yaml:
        * tests/stress/proxy-basic.js: Added.
        (assert):
        (let.handler.get null):
        (get let):
        (let.handler.get switch):
        (let.handler):
        (let.theTarget.get x):
        * tests/stress/proxy-in-proto-chain.js: Added.
        (assert):
        * tests/stress/proxy-of-a-proxy.js: Added.
        (assert):
        (throw.new.Error.):
        * tests/stress/proxy-property-descriptor.js: Added.
        (assert):
        (set Object):
        * wasm/WASMModuleParser.cpp:
        (JSC::WASMModuleParser::getImportedValue):

2016-02-17  Mark Lam  <mark.lam@apple.com>

        StringPrototype functions should check for exceptions after calling JSString::value().
        https://bugs.webkit.org/show_bug.cgi?id=154340

        Reviewed by Filip Pizlo.

        JSString::value() can throw an exception if the JS string is a rope and value()
        needs to resolve the rope but encounters an OutOfMemory error.  If value() is not
        able to resolve the rope, it will return a null string (in addition to throwing
        the exception).  If StringPrototype functions do not check for exceptions after
        calling JSString::value(), they may eventually use the returned null string and
        crash the VM.

        The fix is to add all the necessary exception checks, and do the appropriate
        handling if needed.

        Also in a few place where when an exception is detected, we return JSValue(), I
        changed it to return jsUndefined() instead to be consistent with the rest of the
        file.

        * runtime/StringPrototype.cpp:
        (JSC::replaceUsingRegExpSearch):
        (JSC::stringProtoFuncMatch):
        (JSC::stringProtoFuncSlice):
        (JSC::stringProtoFuncSplit):
        (JSC::stringProtoFuncLocaleCompare):
        (JSC::stringProtoFuncBig):
        (JSC::stringProtoFuncSmall):
        (JSC::stringProtoFuncBlink):
        (JSC::stringProtoFuncBold):
        (JSC::stringProtoFuncFixed):
        (JSC::stringProtoFuncItalics):
        (JSC::stringProtoFuncStrike):
        (JSC::stringProtoFuncSub):
        (JSC::stringProtoFuncSup):
        (JSC::stringProtoFuncFontcolor):
        (JSC::stringProtoFuncFontsize):
        (JSC::stringProtoFuncAnchor):
        (JSC::stringProtoFuncLink):
        (JSC::trimString):

2016-02-17  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r196675.
        https://bugs.webkit.org/show_bug.cgi?id=154344

         "Causes major slowdowns on deltablue-varargs" (Requested by
        keith_miller on #webkit).

        Reverted changeset:

        "Spread operator should be allowed when not the first argument
        of parameter list"
        https://bugs.webkit.org/show_bug.cgi?id=152721
        http://trac.webkit.org/changeset/196675

2016-02-17  Gavin Barraclough  <barraclough@apple.com>

        JSDOMWindow::put should not do the same thing twice
        https://bugs.webkit.org/show_bug.cgi?id=154334

        Reviewed by Chris Dumez.

        It either calls JSGlobalObject::put or Base::put. Hint: these are basically the same thing.
        In the latter case it might call lookupPut. That's redundant; JSObject::put handles static
        table entries.

        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::hasOwnPropertyForWrite): Deleted.
            - no longer needed.

2016-02-16  Filip Pizlo  <fpizlo@apple.com>

        FTL_USES_B3 should be unconditionally true
        https://bugs.webkit.org/show_bug.cgi?id=154324

        Reviewed by Benjamin Poulain.

        * dfg/DFGCommon.h:

2016-02-16  Filip Pizlo  <fpizlo@apple.com>

        FTL should support CompareEq(String:, String:)
        https://bugs.webkit.org/show_bug.cgi?id=154269
        rdar://problem/24499921

        Reviewed by Benjamin Poulain.

        Looks like a slight pdfjs slow-down, probably because we're having some recompilations. I
        think we should land the increased coverage first and fix the issues after, especially since
        the regression is so small and doesn't have a statistically significant effect on the overall
        score.

        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCompareEq):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCompareStrictEq):
        (JSC::FTL::DFG::LowerDFGToLLVM::nonSpeculativeCompare):
        (JSC::FTL::DFG::LowerDFGToLLVM::stringsEqual):
        * tests/stress/ftl-string-equality.js: Added.
        * tests/stress/ftl-string-ident-equality.js: Added.
        * tests/stress/ftl-string-strict-equality.js: Added.

2016-02-16  Filip Pizlo  <fpizlo@apple.com>

        FTL should support NewTypedArray
        https://bugs.webkit.org/show_bug.cgi?id=154268

        Reviewed by Saam Barati.

        3% speed-up on pdfjs. This was already covered by many different tests.

        Rolling this back in after fixing the butterfly argument.

        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNode):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNewArrayWithSize):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNewTypedArray):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileAllocatePropertyStorage):
        (JSC::FTL::DFG::LowerDFGToLLVM::allocateBasicStorageAndGetEnd):
        (JSC::FTL::DFG::LowerDFGToLLVM::allocateBasicStorage):
        (JSC::FTL::DFG::LowerDFGToLLVM::allocateObject):

2016-02-16  Gavin Barraclough  <barraclough@apple.com>

        JSDOMWindow::getOwnPropertySlot should just call getStaticPropertySlot
        https://bugs.webkit.org/show_bug.cgi?id=154257

        Reviewed by Chris Dumez.

        * runtime/Lookup.h:
        (JSC::getStaticPropertySlot):
        (JSC::getStaticFunctionSlot):
        (JSC::getStaticValueSlot):
            - this could all do with a little more love.
              But enforce the basic precedence:
                (1) regular storage properties always win over static table properties.
                (2) if properties have been reified, don't consult the static tables.
                (3) only if the property is not present on the object & not reified
                    should the static hashtable be consulted.

2016-02-16  Gavin Barraclough  <barraclough@apple.com>

        JSDOMWindow::getOwnPropertySlot should not search photo chain
        https://bugs.webkit.org/show_bug.cgi?id=154102

        Reviewed by Chris Dumez.

        Should only return *own* properties.

        * runtime/JSObject.cpp:
        (JSC::JSObject::getOwnPropertyDescriptor):
            - remove hack/special-case for DOMWindow; we no longer need this.

2016-02-16  Keith Miller  <keith_miller@apple.com>

        Spread operator should be allowed when not the first argument of parameter list
        https://bugs.webkit.org/show_bug.cgi?id=152721

        Reviewed by Saam Barati.

        Spread arguments to functions should now be ES6 compliant. Before we
        would only take a spread operator if it was the sole argument to a
        function. Additionally, we would not use the Symbol.iterator on the
        object to generate the arguments. Instead we would do a loop up to the
        length mapping indexed properties to the corresponding argument. We fix
        both these issues by doing an AST transformation from foo(...a, b, ...c, d)
        to foo(...[...a, b, ...c, d]) (where the spread on the rhs uses the
        old spread semantics). This solution has the downside of requiring the
        allocation of another object and copying each element twice but avoids a
        large change to the vm calling convention.

        * interpreter/Interpreter.cpp:
        (JSC::loadVarargs):
        * parser/ASTBuilder.h:
        (JSC::ASTBuilder::createElementList):
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseArguments):
        (JSC::Parser<LexerType>::parseArgument):
        (JSC::Parser<LexerType>::parseMemberExpression):
        * parser/Parser.h:
        * parser/SyntaxChecker.h:
        (JSC::SyntaxChecker::createElementList):
        * tests/es6.yaml:
        * tests/stress/spread-calling.js: Added.
        (testFunction):
        (testEmpty):
        (makeObject):
        (otherIterator.return.next):
        (otherIterator):
        (totalIter):
        (throwingIter.return.next):
        (throwingIter):
        (i.catch):

2016-02-16  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Enable B3 on ARM64
        https://bugs.webkit.org/show_bug.cgi?id=154275

        Reviewed by Mark Lam.

        The port passes more tests than LLVM now, let's use it by default.

        * dfg/DFGCommon.h:

2016-02-16  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r196652.
        https://bugs.webkit.org/show_bug.cgi?id=154315

        This change caused LayoutTest crashes (Requested by ryanhaddad
        on #webkit).

        Reverted changeset:

        "FTL should support NewTypedArray"
        https://bugs.webkit.org/show_bug.cgi?id=154268
        http://trac.webkit.org/changeset/196652

2016-02-16  Brian Burg  <bburg@apple.com>

        RemoteInspector should forward new automation session requests to its client
        https://bugs.webkit.org/show_bug.cgi?id=154260
        <rdar://problem/24663313>

        Reviewed by Timothy Hatcher.

        * inspector/remote/RemoteInspector.h:
        * inspector/remote/RemoteInspector.mm:
        (Inspector::RemoteInspector::xpcConnectionReceivedMessage):
        (Inspector::RemoteInspector::listingForAutomationTarget):
        Use the correct key for the session identifier in the listing. The name()
        override for RemoteAutomationTarget is actually the session identifier.

        (Inspector::RemoteInspector::receivedAutomationSessionRequestMessage):
        * inspector/remote/RemoteInspectorConstants.h: Add new constants.

2016-02-16  Saam barati  <sbarati@apple.com>

        SamplingProfiler still fails with ASan enabled
        https://bugs.webkit.org/show_bug.cgi?id=154301
        <rdar://problem/24679502>

        Reviewed by Filip Pizlo.

        To fix this issue, I've come up with unsafe versions
        of all operations that load memory from the thread's call
        frame. All these new unsafe methods are marked with SUPPRESS_ASAN.

        * interpreter/CallFrame.cpp:
        (JSC::CallFrame::callSiteAsRawBits):
        (JSC::CallFrame::unsafeCallSiteAsRawBits):
        (JSC::CallFrame::callSiteIndex):
        (JSC::CallFrame::unsafeCallSiteIndex):
        (JSC::CallFrame::stack):
        (JSC::CallFrame::callerFrame):
        (JSC::CallFrame::unsafeCallerFrame):
        (JSC::CallFrame::friendlyFunctionName):
        * interpreter/CallFrame.h:
        (JSC::ExecState::calleeAsValue):
        (JSC::ExecState::callee):
        (JSC::ExecState::unsafeCallee):
        (JSC::ExecState::codeBlock):
        (JSC::ExecState::unsafeCodeBlock):
        (JSC::ExecState::scope):
        (JSC::ExecState::callerFrame):
        (JSC::ExecState::callerFrameOrVMEntryFrame):
        (JSC::ExecState::unsafeCallerFrameOrVMEntryFrame):
        (JSC::ExecState::callerFrameOffset):
        (JSC::ExecState::callerFrameAndPC):
        (JSC::ExecState::unsafeCallerFrameAndPC):
        * interpreter/Register.h:
        (JSC::Register::codeBlock):
        (JSC::Register::asanUnsafeCodeBlock):
        (JSC::Register::unboxedInt32):
        (JSC::Register::tag):
        (JSC::Register::unsafeTag):
        (JSC::Register::payload):
        * interpreter/VMEntryRecord.h:
        (JSC::VMEntryRecord::prevTopCallFrame):
        (JSC::VMEntryRecord::unsafePrevTopCallFrame):
        (JSC::VMEntryRecord::prevTopVMEntryFrame):
        (JSC::VMEntryRecord::unsafePrevTopVMEntryFrame):
        * runtime/SamplingProfiler.cpp:
        (JSC::FrameWalker::walk):
        (JSC::FrameWalker::advanceToParentFrame):
        (JSC::FrameWalker::isAtTop):
        (JSC::FrameWalker::resetAtMachineFrame):

2016-02-16  Filip Pizlo  <fpizlo@apple.com>

        FTL should support NewTypedArray
        https://bugs.webkit.org/show_bug.cgi?id=154268

        Reviewed by Saam Barati.

        3% speed-up on pdfjs. This was already covered by many different tests.

        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNode):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNewArrayWithSize):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNewTypedArray):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileAllocatePropertyStorage):
        (JSC::FTL::DFG::LowerDFGToLLVM::allocateBasicStorageAndGetEnd):
        (JSC::FTL::DFG::LowerDFGToLLVM::allocateBasicStorage):
        (JSC::FTL::DFG::LowerDFGToLLVM::allocateObject):

2016-02-16  Saam barati  <sbarati@apple.com>

        stress/sampling-profiler-deep-stack.js fails on ARM 32bit
        https://bugs.webkit.org/show_bug.cgi?id=154255
        <rdar://problem/24662996>

        Reviewed by Mark Lam.

        The bug here wasn't in the implementation of the sampling profiler 
        itself. Rather, it was a bug in the test. JSC wasn't spending a lot
        of time in a function that the test assumed a lot of time was spent in.
        That's because the DFG was doing a good job at optimizing the function
        at the leaf of the recursion. Because of that, we often wouldn't sample it.
        I fixed this by making the leaf function do more work.

        * tests/stress/sampling-profiler-deep-stack.js:
        (platformSupportsSamplingProfiler.foo):

2016-02-16  Chris Dumez  <cdumez@apple.com>

        [Web IDL] Operations should be on the instance for global objects or if [Unforgeable]
        https://bugs.webkit.org/show_bug.cgi?id=154120
        <rdar://problem/24613231>

        Reviewed by Gavin Barraclough.

        Have putEntry() take a thisValue parameter in addition to the base,
        instead of relying on PropertySlot::thisValue() because this did not
        always do the right thing. In particular, when JSDOMWindow::put() was
        called to set a function, it would end up setting the new value on the
        JSDOMWindowShell instead of the actual JSDOMWindow.
        JSDOMWindow::getOwnPropertySlot() would then not be able to find it.
        Therefore the following would fail:
        $ window.open = "test"
        $ console.log(window.open) // prints the native function instead of "test"

        * runtime/JSObject.cpp:
        (JSC::JSObject::putInlineSlow):
        * runtime/Lookup.h:
        (JSC::putEntry):
        (JSC::lookupPut):

2016-02-16  Keith Miller  <keith_miller@apple.com>

        ClonedArguments should not materialize its special properties unless they are being changed or deleted
        https://bugs.webkit.org/show_bug.cgi?id=154128

        Reviewed by Filip Pizlo.

        Before we would materialize ClonedArguments whenever they were being accessed.
        However this would cause the IC to miss every time as the structure for
        the arguments object would change as we went to IC it. Thus on the next
        function call we would miss the cache since the new arguments object
        would not have materialized the value.

        * runtime/ClonedArguments.cpp:
        (JSC::ClonedArguments::getOwnPropertySlot):
        * tests/stress/cloned-arguments-modification.js: Added.
        (foo):

2016-02-16  Filip Pizlo  <fpizlo@apple.com>

        FTL should support StringFromCharCode
        https://bugs.webkit.org/show_bug.cgi?id=154267
        rdar://problem/24192536

        Reviewed by Mark Lam.

        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode): Fix a bug preventing the UntypedUse from being effective.
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNode):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileStringFromCharCode): Implement the opcode.
        * tests/stress/string-from-char-code-slow.js: Added.

2016-02-15  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] BranchAdd can override arguments of its stackmap
        https://bugs.webkit.org/show_bug.cgi?id=154274

        Reviewed by Filip Pizlo.

        With the 3 operands BranchAdd added in r196513, we can run into
        a register allocation such that the destination register is also
        used by a value in the stack map.

        It use to be that BranchAdd was a 2 operand instruction.
        In that form, the destination is also one of the source and
        can be recovered through Sub. There is no conflict between
        destination and the stackmap.

        After r196513, the destination has its own value. It is uncommon
        on x86 because of the aggressive aliasing but that can happen.
        On ARM, that's a standard form since there is no need for aliasing.

        Since the arguments of the stackmap are of type EarlyUse,
        they appeared as not interfering with the destination. When the register
        allocator gives the same register to the destination and something in
        the stack map, the result of BranchAdd destroys the value kept alive
        for the stackmap.

        In this patch, I introduce a concept very similar to ForceLateUse
        to keep the argument of the stackmap live in CheckAdd. The new
        role is "ForceLateUseUnlessRecoverable".

        In this mode, anything that is not also an input argument becomes
        LateUse. As such, it interferes with the destination of CheckAdd.
        The arguments are recovered by the slow patch of CheckAdd. They
        remain Early use.

        This new modes ensure that destination can be aliased to the source
        when that's useful, while making sure it is not aliased with another
        value that needs to be live on exit.

        * b3/B3CheckSpecial.cpp:
        (JSC::B3::CheckSpecial::forEachArg):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3PatchpointSpecial.cpp:
        (JSC::B3::PatchpointSpecial::forEachArg):
        * b3/B3StackmapSpecial.cpp:
        (JSC::B3::StackmapSpecial::forEachArgImpl):
        (WTF::printInternal):
        * b3/B3StackmapSpecial.h:
        * b3/B3StackmapValue.h:

2016-02-15  Joseph Pecoraro  <pecoraro@apple.com>

        Web Inspector: Web Workers have no access to console for debugging
        https://bugs.webkit.org/show_bug.cgi?id=26237

        Reviewed by Timothy Hatcher.

        * inspector/ConsoleMessage.h:
        Add accessor for MessageLevel.

2016-02-15  Mark Lam  <mark.lam@apple.com>

        [ARMv7] stress/op_rshift.js and stress/op_urshift.js are failing.
        https://bugs.webkit.org/show_bug.cgi?id=151514

        Reviewed by Filip Pizlo.

        The issue turns out to be trivial: on ARMv7 (and traditional ARM too), arithmetic
        shift right (ASR) and logical shift right (LSR) takes an immediate shift amount
        from 1-32.  See http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0204j/Cjacbgca.html.
        An immediate shift amount of 0 is interpreted as a shift of 32 bits.

        Meanwhile, our macro assembler is expecting the immediate shift value to be
        between 0-31.  As a result, a shift amount of 0 is being wrongly encoded with 0
        bits which means shift right by 32 bits.

        The fix is to check if the shift amount is 0, and if so, emit a move.  Else,
        emit the right shift as usual.

        This issue does not affect left shifts, as the immediate shift amount for left
        shifts is between 0-31 as our macro assembler expects.

        * assembler/MacroAssemblerARM.h:
        (JSC::MacroAssemblerARM::rshift32):
        (JSC::MacroAssemblerARM::urshift32):
        (JSC::MacroAssemblerARM::sub32):
        * assembler/MacroAssemblerARMv7.h:
        (JSC::MacroAssemblerARMv7::rshift32):
        (JSC::MacroAssemblerARMv7::urshift32):

        * tests/stress/op_rshift.js:
        * tests/stress/op_urshift.js:
        - Un-skip these tests.  They should always pass now.

2016-02-15  Filip Pizlo  <fpizlo@apple.com>

        Parser::parseVariableDeclarationList should null check the node before attempting to create a new CommaExpr
        https://bugs.webkit.org/show_bug.cgi?id=154244
        rdar://problem/24290670

        Reviewed by Michael Saboff.

        * parser/ASTBuilder.h:
        (JSC::ASTBuilder::appendToCommaExpr): Catch the bug sooner in debug.
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseVariableDeclarationList): Fix the bug.
        * tests/stress/for-let-comma.js: Added. This used to crash in debug and release.

2016-02-15  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Improve the interface of Inst::shouldTryAliasingDef()
        https://bugs.webkit.org/show_bug.cgi?id=154227

        Reviewed by Andreas Kling.

        Using Optional<> instead of a bool+reference looks cleaner
        at the call sites.

        * b3/B3CheckSpecial.cpp:
        (JSC::B3::CheckSpecial::shouldTryAliasingDef):
        * b3/B3CheckSpecial.h:
        * b3/air/AirCustom.h:
        (JSC::B3::Air::PatchCustom::shouldTryAliasingDef):
        * b3/air/AirInst.h:
        * b3/air/AirInstInlines.h:
        (JSC::B3::Air::Inst::shouldTryAliasingDef):
        * b3/air/AirIteratedRegisterCoalescing.cpp:
        * b3/air/AirSpecial.cpp:
        (JSC::B3::Air::Special::shouldTryAliasingDef):
        * b3/air/AirSpecial.h:

2016-02-14  Brian Burg  <bburg@apple.com>

        WKAutomationDelegate's requestAutomationSession should take a suggested session identifier
        https://bugs.webkit.org/show_bug.cgi?id=154012
        <rdar://problem/24557697>

        Reviewed by Darin Adler.

        Add a string parameter to the client method for requesting a new session.

        * inspector/remote/RemoteInspector.h:

2016-02-13  Timothy Hatcher  <timothy@apple.com>

        Fix WebAssembly bug URL in the feature list.

        * features.json:

2016-02-12  Sukolsak Sakshuwong  <sukolsak@gmail.com>

        Change the last RefPtr::get() to release() in String.prototype.normalize
        https://bugs.webkit.org/show_bug.cgi?id=154211

        Reviewed by Ryosuke Niwa.

        Change the last RefPtr::get() to release() in String.prototype.normalize.

        * runtime/StringPrototype.cpp:
        (JSC::normalize):

2016-02-12  Saam barati  <sbarati@apple.com>

        [ES6] we have an incorrect syntax error when a callee of a function expression has the same name as a top-level lexical declaration
        https://bugs.webkit.org/show_bug.cgi?id=154143

        Reviewed by Benjamin Poulain.

        We were raising syntax errors on the following type of programs when
        we shouldn't have been.
        ```
        (function foo() { const foo = 20; });
        ```

        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseFunctionInfo):
        * parser/Parser.h:
        (JSC::Scope::computeLexicallyCapturedVariablesAndPurgeCandidates):
        (JSC::Scope::declareCallee):
        (JSC::Scope::declareVariable):
        (JSC::Scope::hasDeclaredVariable):
        (JSC::Scope::hasLexicallyDeclaredVariable):
        (JSC::Scope::hasDeclaredParameter):
        (JSC::Scope::declareWrite):
        (JSC::Scope::getCapturedVars):

2016-02-12  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] ZeroExtend and SignExtend use incorrect addressing on ARM64
        https://bugs.webkit.org/show_bug.cgi?id=154208

        Reviewed by Filip Pizlo.

        When lowering:
            @1 = Load32(@x)
            @2 = SExt8(@1)

        LowerToAir would see there is a form of SignExtend8To32 (an alias for Load8S)
        and use that.

        There are two problems with that:
        1) If we have an Addr, it went through legalizeMemoryOffsets() for a 32bits
           load. If used on an other kind of load, there is no guarantee the addressing
           is still valid.
        2) If we have an Index, it is computed for the 32bits MemoryValue.
           The computed index is not valid for the 8bits load.

        (2) could be fixed by changing LowerToAir to use the current instruction width
        instead of the B3ValueWidth but that's a bit tricky. We should just embrace
        that one of our target is a Load-Store architecture.

        In this patch, I just disabled the faulty forms on ARM64. We still need those operations
        to be fast, this will be addressed in: https://bugs.webkit.org/show_bug.cgi?id=154207

        I also strengthened the m_allowScratchRegister assertion. The instructions that do not
        invalidate the temporary did not run the assertion, making this harder to debug.

        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::load8):
        (JSC::MacroAssemblerARM64::store64):
        (JSC::MacroAssemblerARM64::store32):
        (JSC::MacroAssemblerARM64::loadDouble):
        (JSC::MacroAssemblerARM64::storeDouble):
        (JSC::MacroAssemblerARM64::branch32):
        (JSC::MacroAssemblerARM64::branch64):
        (JSC::MacroAssemblerARM64::getCachedDataTempRegisterIDAndInvalidate):
        (JSC::MacroAssemblerARM64::getCachedMemoryTempRegisterIDAndInvalidate):
        (JSC::MacroAssemblerARM64::dataMemoryTempRegister):
        (JSC::MacroAssemblerARM64::cachedMemoryTempRegister):
        (JSC::MacroAssemblerARM64::load):
        (JSC::MacroAssemblerARM64::store):
        * b3/air/AirOpcode.opcodes:

2016-02-12  Michael Saboff  <msaboff@apple.com>

        offlineasm: Emit Dwarf2 file and location directives to allow for debugging .asm files
        https://bugs.webkit.org/show_bug.cgi?id=152703

        Reviewed by Mark Lam.

        Added support to output Dwarf2 .file and .loc assembler directives to provide the debugging
        information needed to correlate the offline assembler generated code with the source lines 
        in the .asm files.

        Changed the tracking of file data to include a file index that was provided to the .file
        directive.  That index is used when emitting the .loc directives.

        * offlineasm/arm.rb:
        * offlineasm/arm64.rb:
        * offlineasm/asm.rb:
        * offlineasm/backends.rb:
        * offlineasm/config.rb:
        * offlineasm/parser.rb:
        * offlineasm/x86.rb:

2016-02-12  Saam barati  <sbarati@apple.com>

        The parser doesn't properly protect against global variable references in builtins
        https://bugs.webkit.org/show_bug.cgi?id=154144

        Reviewed by Geoffrey Garen.

        This patch fixes our global variable reference detection
        algorithm that was broken. After fixing the algorithm, I
        detected many places where we were incorrectly using global
        variables. I've fixed all those.

        * builtins/BuiltinExecutables.cpp:
        (JSC::createExecutableInternal):
        * builtins/NumberPrototype.js:
        (toLocaleString):
        * builtins/PromiseConstructor.js:
        (race):
        (reject):
        (resolve):
        * parser/Nodes.cpp:
        (JSC::ProgramNode::ProgramNode):
        (JSC::ModuleProgramNode::ModuleProgramNode):
        (JSC::ProgramNode::setClosedVariables): Deleted.
        * parser/Nodes.h:
        (JSC::ScopeNode::setClosedVariables): Deleted.
        (JSC::ProgramNode::closedVariables): Deleted.
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseInner):
        (JSC::Parser<LexerType>::didFinishParsing):
        * parser/Parser.h:
        (JSC::Scope::setIsLexicalScope):
        (JSC::Scope::isLexicalScope):
        (JSC::Scope::closedVariableCandidates):
        (JSC::Scope::declaredVariables):
        (JSC::Scope::lexicalVariables):
        (JSC::Scope::finalizeLexicalEnvironment):
        (JSC::Parser::positionBeforeLastNewline):
        (JSC::Parser::locationBeforeLastToken):
        (JSC::Parser::isFunctionMetadataNode):
        (JSC::parse):
        (JSC::Parser::closedVariables): Deleted.

2016-02-12  Filip Pizlo  <fpizlo@apple.com>

        JSObject::putByIndexBeyondVectorLengthWithoutAttributes needs to go to the sparse map based on MAX_STORAGE_VECTOR_INDEX
        https://bugs.webkit.org/show_bug.cgi?id=154201
        rdar://problem/24291387

        Reviewed by Saam Barati.

        I decided against adding a test for this, because it runs for a very long time.

        * runtime/JSObject.cpp:
        (JSC::JSObject::putByIndexBeyondVectorLengthWithoutAttributes): Fix the bug.
        * runtime/StringPrototype.cpp:
        (JSC::stringProtoFuncSplit): Fix a related bug: if this code creates an array that would have
            hit the above bug, then it would probably manifest as a spin or as swapping.

2016-02-12  Jonathan Davis  <jond@apple.com>

        Add WebAssembly to the status page
        https://bugs.webkit.org/show_bug.cgi?id=154199

        Reviewed by Timothy Hatcher.

        * features.json:

2016-02-12  Brian Burg  <bburg@apple.com>

        Web Inspector: disambiguate the various identifier and connection types in RemoteInspector
        https://bugs.webkit.org/show_bug.cgi?id=154130

        Reviewed by Joseph Pecoraro.

        There are multiple identifier types:
            - connection identifier, a string UUID for a remote debugger process.
            - session identifier, a string UUID for a remote driver/debugger instance.
            - page/target identifier, a number unique within a single process.

        There are multiple connection types:
            - RemoteInspectorXPCConnection, a connection from RemoteInspectorXPCConnectionor to a relay.
            - RemoteConnectionToTarget, a class that bridges to targets' dispatch queues.

        Use consistent variable and getter names so that these don't get confused and
        so that the code is easier to read. This is especially an improvement when working
        with multiple target types or connection types within the same function.

        * inspector/remote/RemoteConnectionToTarget.h:
        * inspector/remote/RemoteConnectionToTarget.mm:
        Remove the member for m_identifier since we can ask the target for its target identifier
        or use a default value via WTF::Optional. There's no reason to cache the value.

        (Inspector::RemoteTargetHandleRunSourceWithInfo):
        (Inspector::RemoteConnectionToTarget::targetIdentifier):
        (Inspector::RemoteConnectionToTarget::destination):
        (Inspector::RemoteConnectionToTarget::setup):
        (Inspector::RemoteConnectionToTarget::sendMessageToFrontend):
        Bail out if the target pointer was somehow cleared and we can't get a useful target identifier.

        (Inspector::RemoteConnectionToTarget::RemoteConnectionToTarget): Deleted.
        * inspector/remote/RemoteControllableTarget.h:
        * inspector/remote/RemoteInspectionTarget.cpp:
        (Inspector::RemoteInspectionTarget::pauseWaitingForAutomaticInspection):
        (Inspector::RemoteInspectionTarget::unpauseForInitializedInspector):
        * inspector/remote/RemoteInspector.h:
        * inspector/remote/RemoteInspector.mm:
        (Inspector::RemoteInspector::nextAvailableTargetIdentifier):
        (Inspector::RemoteInspector::registerTarget):
        (Inspector::RemoteInspector::unregisterTarget):
        (Inspector::RemoteInspector::updateTarget):
        (Inspector::RemoteInspector::updateAutomaticInspectionCandidate):
        (Inspector::RemoteInspector::sendAutomaticInspectionCandidateMessage):
        (Inspector::RemoteInspector::sendMessageToRemote):
        (Inspector::RemoteInspector::setupFailed):
        (Inspector::RemoteInspector::setupCompleted):
        (Inspector::RemoteInspector::stopInternal):
        (Inspector::RemoteInspector::setupXPCConnectionIfNeeded):
        (Inspector::RemoteInspector::xpcConnectionFailed):
        (Inspector::RemoteInspector::listingForInspectionTarget):
        (Inspector::RemoteInspector::listingForAutomationTarget):
        (Inspector::RemoteInspector::pushListingsNow):
        (Inspector::RemoteInspector::pushListingsSoon):
        (Inspector::RemoteInspector::updateHasActiveDebugSession):
        (Inspector::RemoteInspector::receivedSetupMessage):
        (Inspector::RemoteInspector::receivedDataMessage):
        (Inspector::RemoteInspector::receivedDidCloseMessage):
        (Inspector::RemoteInspector::receivedIndicateMessage):
        (Inspector::RemoteInspector::receivedProxyApplicationSetupMessage):
        (Inspector::RemoteInspector::receivedConnectionDiedMessage):
        (Inspector::RemoteInspector::receivedAutomaticInspectionRejectMessage):
        (Inspector::RemoteInspector::nextAvailableIdentifier): Deleted.
        * inspector/remote/RemoteInspectorConstants.h:

2016-02-12  Benjamin Poulain  <benjamin@webkit.org>

        [JSC] On x86, improve the selection of which value are selected for the UseDef part of commutative operations
        https://bugs.webkit.org/show_bug.cgi?id=154151

        Reviewed by Filip Pizlo.

        Previously, when an instruction destroy an argument with
        a UseDef use, we would try to pick a good target for the UseDef
        while doing instruction selection.

        For example:
            @x = Add(@1, @2)

        can be lowered to:
            Move @1 Tmp3
            Add @2 Tmp3
        or
            Move @2 Tmp3
            Add @1 Tmp3

        The choice of which value ends up copied is done by preferRightForResult()
        at lowering time.

        There are two common problems with the code we generate:
        1) It is based on UseCount. If a value is at its last use,
           it is a good target for coalescing even with a use-count > 1.
        2) When both values are at their last use, the best choice
           depends on the register pressure of each. We don't have that information
           until we do register allocation.

        This patch implements a simple idea to minimize how many of those Moves are needed.
        Each commutative operation gets a 3 op variant. The register allocator then attempts
        to alias *both* of them to the destination.
        Since our aliasing is conservative, it removes as many copy as possible without causing
        spilling.

        There was an unexpected cool impovement too. If you have:
            Move Tmp1, Tmp2
            BranchAdd32 Tmp3, Tmp2
        we would previously restore Tmp2 by substracting Tmp3 from the result.
        We can now just use Tmp1. That removes quite a few Sub from the slow paths.

        The problem is that simple idea uncoverred a bunch of issues that had to be fixed too.
        I detail them inline below.

        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::and64):
        * assembler/MacroAssemblerX86Common.h:
        Most addition are adding an Address version of the 3 operands opcodes.
        The reason for this is allow the complex addressing forms of instructions
        when spilling.

        (JSC::MacroAssemblerX86Common::and32):
        (JSC::MacroAssemblerX86Common::mul32):
        (JSC::MacroAssemblerX86Common::or32):
        (JSC::MacroAssemblerX86Common::xor32):
        (JSC::MacroAssemblerX86Common::moveDouble):
        This was an unexpected discovery: removing tons of Move32 made floating-point heavy
        code much slower.

        It turns out the MoveDouble we were using has partial register dependencies.

        The x86 optimization manual, Chapter 3, section 3.4.1.13 lists the move instructions executed
        directly on the frontend. That's what we use now.

        (JSC::MacroAssemblerX86Common::addDouble):
        (JSC::MacroAssemblerX86Common::addFloat):
        (JSC::MacroAssemblerX86Common::mulDouble):
        (JSC::MacroAssemblerX86Common::mulFloat):
        (JSC::MacroAssemblerX86Common::andDouble):
        (JSC::MacroAssemblerX86Common::andFloat):
        (JSC::MacroAssemblerX86Common::xorDouble):
        (JSC::MacroAssemblerX86Common::xorFloat):
        If the destination is not aliased, the version taking an address
        use LoadFloat/LoadDouble instead of direct addressing.

        That is because this:
            Move Tmp1, Tmp2
            Op [Tmp3], Tmp2
        is slower than
            Move [Tmp3] Tmp2
            Op Tmp1, Tmp2
        (sometimes significantly).

        I am not exactly sure why.

        (JSC::MacroAssemblerX86Common::branchAdd32):
        * assembler/MacroAssemblerX86_64.h:
        (JSC::MacroAssemblerX86_64::and64):
        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::and64):
        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::and32):
        (JSC::MacroAssemblerX86Common::mul32):
        (JSC::MacroAssemblerX86Common::or32):
        (JSC::MacroAssemblerX86Common::xor32):
        (JSC::MacroAssemblerX86Common::moveDouble):
        (JSC::MacroAssemblerX86Common::addDouble):
        (JSC::MacroAssemblerX86Common::addFloat):
        (JSC::MacroAssemblerX86Common::mulDouble):
        (JSC::MacroAssemblerX86Common::mulFloat):
        (JSC::MacroAssemblerX86Common::andDouble):
        (JSC::MacroAssemblerX86Common::andFloat):
        (JSC::MacroAssemblerX86Common::xorDouble):
        (JSC::MacroAssemblerX86Common::xorFloat):
        (JSC::MacroAssemblerX86Common::branchAdd32):
        * assembler/MacroAssemblerX86_64.h:
        (JSC::MacroAssemblerX86_64::and64):
        (JSC::MacroAssemblerX86_64::mul64):
        (JSC::MacroAssemblerX86_64::xor64):
        (JSC::MacroAssemblerX86_64::branchAdd64):
        * assembler/X86Assembler.h:
        (JSC::X86Assembler::movapd_rr):
        (JSC::X86Assembler::movaps_rr):
        * b3/B3CheckSpecial.cpp:
        (JSC::B3::CheckSpecial::shouldTryAliasingDef):
        (JSC::B3::CheckSpecial::generate):
        * b3/B3CheckSpecial.h:
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::lower):
        * b3/air/AirCustom.h:
        (JSC::B3::Air::PatchCustom::shouldTryAliasingDef):
        * b3/air/AirInst.h:
        * b3/air/AirInstInlines.h:
        (JSC::B3::Air::Inst::shouldTryAliasingDef):
        * b3/air/AirIteratedRegisterCoalescing.cpp:
        Aliasing the operands is done the same way as any coalescing.

        There were problem with considering all those coalescing
        as equivalent for the result.

        Moves are mostly generated for Upsilon-Phis. Getting rid of
        those tends to give better loops.

        Sometimes, blocks have only Phis and a Jump. Coalescing
        those moves gets rids of the block entirely.

        Where it go interesting was that something like:
            Move Tmp1, Tmp2
            Op Tmp3, Tmp2
        was significantly better than:
            Op Tmp1, Tmp3
            Move Tmp1, Tmp4
        even in the same basic block.

        To get back to the same performance when, I had to prioritize
        regular Moves operations over argument coalescing.

        Another argument for doing this is that the alias has a shorter
        life in the hardware because the operation itself gets a new
        virtual register from the bank.

        * b3/air/AirOpcode.opcodes:
        * b3/air/AirSpecial.cpp:
        (JSC::B3::Air::Special::shouldTryAliasingDef):
        * b3/air/AirSpecial.h:
        * b3/testb3.cpp:
        (JSC::B3::testCheckAddArgumentAliasing64):
        (JSC::B3::testCheckAddArgumentAliasing32):
        (JSC::B3::testCheckAddSelfOverflow64):
        (JSC::B3::testCheckAddSelfOverflow32):
        (JSC::B3::testCheckMulArgumentAliasing64):
        (JSC::B3::testCheckMulArgumentAliasing32):
        (JSC::B3::run):

        * dfg/DFGOSRExitCompilerCommon.cpp:
        (JSC::DFG::reifyInlinedCallFrames):
        * jit/AssemblyHelpers.h:
        (JSC::AssemblyHelpers::emitSaveOrCopyCalleeSavesFor):
        This ruined my week.

        When regenerating the frame of an inlined function that
        was called through a tail call, we were ignoring r13 for some reason.

        Since this patch makes it more likely to increase the degree
        of each Tmp, the number of register used increased and r13 was more
        commonly used.

        When getting out of OSRExit, we would have that value trashed :(

        The fix is simply to restore it like the other two Baseline callee saved
        register.

2016-02-12  Yusuke Suzuki  <utatane.tea@gmail.com>

        [ES6] Implement @@search
        https://bugs.webkit.org/show_bug.cgi?id=143889

        Reviewed by Darin Adler.

        Implement RegExp.prototype[@@search].
        In ES6, String.prototype.search delegates the actual matching to it
        instead of executing RegExp matching inside String.prototype.search method itself.
        By customizing @@search method, we can change the behavior of String.prototype.search for
        derived / customized RegExp object.

        * CMakeLists.txt:
        * DerivedSources.make:
        * builtins/BuiltinNames.h:
        (JSC::BuiltinNames::BuiltinNames): Deleted.
        * builtins/BuiltinUtils.h:
        * builtins/StringPrototype.js:
        (search):
        * bytecode/BytecodeIntrinsicRegistry.cpp:
        (JSC::BytecodeIntrinsicRegistry::BytecodeIntrinsicRegistry):
        * bytecode/BytecodeIntrinsicRegistry.h:
        * runtime/CommonIdentifiers.h:
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        * runtime/RegExpPrototype.cpp:
        (JSC::RegExpPrototype::finishCreation):
        (JSC::regExpProtoFuncSearch):
        * runtime/RegExpPrototype.h:
        (JSC::RegExpPrototype::create):
        * runtime/StringPrototype.cpp:
        (JSC::StringPrototype::getOwnPropertySlot):
        (JSC::StringPrototype::finishCreation): Deleted.
        (JSC::stringProtoFuncSearch): Deleted.
        * runtime/StringPrototype.h:
        * tests/es6.yaml:
        * tests/stress/regexp-search.js: Added.
        (shouldBe):
        (shouldThrow):
        (errorKey.toString):
        (primitive.of.primitives.shouldThrow):
        (testRegExpSearch):
        (testSearch):
        (testBoth):
        (alwaysUnmatch):

2016-02-12  Keith Miller  <keith_miller@apple.com>

        AdaptiveInferredPropertyValueWatchpoint can trigger a GC that frees its CodeBlock and thus itself
        https://bugs.webkit.org/show_bug.cgi?id=154146

        Reviewed by Filip Pizlo.

        Consider the following: there is some CodeBlock, C, that is watching some object, O, with a
        structure, S, for replacements. Also, suppose that C has no references anymore and is due to
        be GCed. Now, when some new property is added to O, S will create a new structure S' and
        fire its transition watchpoints. Since C is watching S for replacements it will attempt to
        have its AdaptiveInferredPropertyValueWatchpoint relocate itself to S'. To do so, it needs
        it allocate RareData on S'. This allocation may cause a GC, which frees C while still
        executing its watchpoint handler. The solution to this is to defer GC while running
        AdaptiveInferredPropertyValueWatchpointBase handlers.

        * bytecode/AdaptiveInferredPropertyValueWatchpointBase.cpp:
        (JSC::AdaptiveInferredPropertyValueWatchpointBase::fire):

2016-02-12  Gavin Barraclough  <barraclough@apple.com>

        Separate out !allowsAccess path in JSDOMWindowCustom getOwnPropertySlot
        https://bugs.webkit.org/show_bug.cgi?id=154156

        Reviewed by Chris Dumez.

        * runtime/CommonIdentifiers.h:
            - added new property names, needed by jsDOMWindowGetOwnPropertySlotDisallowAccess.

2016-02-12  Sukolsak Sakshuwong  <sukolsak@gmail.com>

        Update ICU header files to version 52
        https://bugs.webkit.org/show_bug.cgi?id=154160

        Reviewed by Alex Christensen.

        Update ICU header files to version 52 to allow the use of newer APIs.

        * icu/unicode/localpointer.h:
        * icu/unicode/platform.h:
        * icu/unicode/ptypes.h:
        * icu/unicode/putil.h:
        * icu/unicode/ucal.h:
        * icu/unicode/uchar.h:
        * icu/unicode/ucnv.h:
        * icu/unicode/ucol.h:
        * icu/unicode/uconfig.h:
        * icu/unicode/udat.h:
        * icu/unicode/udatpg.h:
        * icu/unicode/udisplaycontext.h: Added.
        * icu/unicode/uenum.h:
        * icu/unicode/uformattable.h: Added.
        * icu/unicode/uiter.h:
        * icu/unicode/uloc.h:
        * icu/unicode/umachine.h:
        * icu/unicode/unorm2.h:
        * icu/unicode/unum.h:
        * icu/unicode/urename.h:
        * icu/unicode/uscript.h:
        * icu/unicode/uset.h:
        * icu/unicode/ustring.h:
        * icu/unicode/utf.h:
        * icu/unicode/utf16.h:
        * icu/unicode/utf8.h:
        * icu/unicode/utf_old.h:
        * icu/unicode/utypes.h:
        * icu/unicode/uvernum.h:
        * icu/unicode/uversion.h:

2016-02-12  Filip Pizlo  <fpizlo@apple.com>

        Fast path in JSObject::defineOwnIndexedProperty() forgets to check for the posibility of a descriptor that doesn't have a value
        https://bugs.webkit.org/show_bug.cgi?id=154175
        rdar://problem/24291497

        Reviewed by Geoffrey Garen.

        * runtime/JSObject.cpp:
        (JSC::JSObject::defineOwnIndexedProperty): Fix the bug.
        * runtime/SparseArrayValueMap.cpp:
        (JSC::SparseArrayValueMap::putEntry): Catch the bug sooner in debug.
        (JSC::SparseArrayValueMap::putDirect):
        * tests/stress/sparse-define-empty-descriptor.js: Added. This used to crash in release.

2016-02-11  Brian Burg  <bburg@apple.com>

        Web Inspector: RemoteInspector's listings should include whether an AutomationTarget is paired
        https://bugs.webkit.org/show_bug.cgi?id=154077
        <rdar://problem/24589133>

        Reviewed by Joseph Pecoraro.

        Instead of not generating a listing for the target when it is occupied,
        generate the listing with a 'paired' flag. The old flag was redundant
        because a _WKAutomationDelegate will not create a session if it doesn't
        support automation or it already has an active session.

        * inspector/remote/RemoteAutomationTarget.cpp:
        (Inspector::RemoteAutomationTarget::setIsPaired):
        (Inspector::RemoteAutomationTarget::setAutomationAllowed): Deleted.
        * inspector/remote/RemoteAutomationTarget.h:
        Return false for remoteControlAllowed() if the target is already paired.
        This function is used by RemoteInspector to deny incoming connections.

        * inspector/remote/RemoteInspector.mm:
        (Inspector::RemoteInspector::listingForAutomationTarget):
        * inspector/remote/RemoteInspectorConstants.h:

2016-02-11  Filip Pizlo  <fpizlo@apple.com>

        DFG::ByteCodeParser needs to null check the result of presenceLike()
        https://bugs.webkit.org/show_bug.cgi?id=154135
        rdar://problem/24291586

        Reviewed by Geoffrey Garen.

        ByteCodeParser::presenceLike() could return a null object property condition if it detects a
        contradiction. That could happen due to bogus profiling. It's totally OK - we just need to
        bail from using a property condition when that happens.

        * bytecode/ObjectPropertyCondition.h:
        (JSC::ObjectPropertyCondition::equivalence):
        (JSC::ObjectPropertyCondition::operator bool):
        (JSC::ObjectPropertyCondition::object):
        (JSC::ObjectPropertyCondition::condition):
        (JSC::ObjectPropertyCondition::operator!): Deleted.
        * bytecode/PropertyCondition.h:
        (JSC::PropertyCondition::equivalence):
        (JSC::PropertyCondition::operator bool):
        (JSC::PropertyCondition::kind):
        (JSC::PropertyCondition::uid):
        (JSC::PropertyCondition::operator!): Deleted.
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::check):
        (JSC::DFG::ByteCodeParser::load):

2016-02-11  Benjamin Poulain  <benjamin@webkit.org>

        [JSC] SqrtFloat and CeilFloat also suffer from partial register stalls
        https://bugs.webkit.org/show_bug.cgi?id=154131

        Reviewed by Filip Pizlo.

        Looks like I forgot to update this when adding Float support.
        Credit to Filip for finding this issue.

        * b3/air/AirFixPartialRegisterStalls.cpp:

2016-02-11  Filip Pizlo  <fpizlo@apple.com>

        Cannot call initializeIndex() if we didn't create the array using tryCreateUninitialized()
        https://bugs.webkit.org/show_bug.cgi?id=154126

        Reviewed by Saam Barati.

        * runtime/ArrayPrototype.cpp:
        (JSC::arrayProtoFuncSplice):

2016-02-11  Sukolsak Sakshuwong  <sukolsak@gmail.com>

        [INTL] Implement Intl.NumberFormat.prototype.resolvedOptions ()
        https://bugs.webkit.org/show_bug.cgi?id=147602

        Reviewed by Darin Adler.

        This patch implements Intl.NumberFormat.prototype.resolvedOptions() according
        to the ECMAScript 2015 Internationalization API spec (ECMA-402 2nd edition.)

        * runtime/IntlDateTimeFormat.cpp:
        (JSC::localeData):
        * runtime/IntlNumberFormat.cpp:
        (JSC::localeData):
        (JSC::computeCurrencySortKey):
        (JSC::extractCurrencySortKey):
        (JSC::computeCurrencyDigits):
        (JSC::IntlNumberFormat::initializeNumberFormat):
        (JSC::IntlNumberFormat::styleString):
        (JSC::IntlNumberFormat::currencyDisplayString):
        (JSC::IntlNumberFormat::resolvedOptions):
        (JSC::IntlNumberFormat::setBoundFormat):
        * runtime/IntlNumberFormat.h:
        * runtime/IntlNumberFormatConstructor.cpp:
        (JSC::constructIntlNumberFormat):
        (JSC::callIntlNumberFormat):
        * runtime/IntlNumberFormatPrototype.cpp:
        (JSC::IntlNumberFormatPrototypeFuncResolvedOptions):
        * runtime/IntlObject.cpp:
        (JSC::intlNumberOption):
        (JSC::numberingSystemsForLocale):
        (JSC::getNumberingSystemsForLocale): Deleted.
        * runtime/IntlObject.h:

2016-02-11  Filip Pizlo  <fpizlo@apple.com>

        MacroAssemblerX86 should be happy with shift(cx, cx)
        https://bugs.webkit.org/show_bug.cgi?id=154124

        Reviewed by Saam Barati.

        Prior to this change the assembler asserted that shift_amount and dest cannot be the same.
        That's a good assertion for when shift_amount is not in cx. But if it's in cx already then
        it's OK for them to be the same. Air will sometimes do shift(cx, cx) if you do "x << x" and
        the coalescing got particularly clever.

        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::lshift32):
        (JSC::MacroAssemblerX86Common::rshift32):
        (JSC::MacroAssemblerX86Common::urshift32):
        * assembler/MacroAssemblerX86_64.h:
        (JSC::MacroAssemblerX86_64::lshift64):
        (JSC::MacroAssemblerX86_64::rshift64):
        (JSC::MacroAssemblerX86_64::urshift64):
        * b3/testb3.cpp:
        (JSC::B3::testLShiftSelf32):
        (JSC::B3::testRShiftSelf32):
        (JSC::B3::testURShiftSelf32):
        (JSC::B3::testLShiftSelf64):
        (JSC::B3::testRShiftSelf64):
        (JSC::B3::testURShiftSelf64):
        (JSC::B3::run):

2016-02-11  Saam barati  <sbarati@apple.com>

        The sampling profiler's stack walker methods should be marked with SUPPRESS_ASAN
        https://bugs.webkit.org/show_bug.cgi?id=154123

        Reviewed by Mark Lam.

        The entire premise of the sampling profiler is to load from
        another thread's memory. We should SUPPRESS_ASAN on the
        methods that do this.

        * runtime/SamplingProfiler.cpp:
        (JSC::FrameWalker::FrameWalker):
        (JSC::FrameWalker::walk):
        (JSC::FrameWalker::advanceToParentFrame):
        (JSC::FrameWalker::isAtTop):
        (JSC::FrameWalker::resetAtMachineFrame):

2016-02-11  Csaba Osztrogonác  <ossy@webkit.org>

        Unreviewed typo fix after r190063.

        * dfg/DFGSpeculativeJIT.cpp: Removed property svn:executable.
        * dfg/DFGSpeculativeJIT.h: Removed property svn:executable.
        * jit/JIT.h: Removed property svn:executable.
        * jit/JITInlines.h: Removed property svn:executable.
        * jit/JITOpcodes.cpp: Removed property svn:executable.

2016-02-11  Csaba Osztrogonác  <ossy@webkit.org>

        Unreviewed typo fix after r190063.

        * dfg/DFGSpeculativeJIT.cpp: Removed property svn:executable.
        * dfg/DFGSpeculativeJIT.h: Removed property svn:executable.
        * jit/JIT.h: Removed property svn:executable.
        * jit/JITInlines.h: Removed property svn:executable.
        * jit/JITOpcodes.cpp: Removed property svn:executable.

2016-02-10  Keith Miller  <keith_miller@apple.com>

        Symbol.species accessors on builtin constructors should be configurable
        https://bugs.webkit.org/show_bug.cgi?id=154097

        Reviewed by Benjamin Poulain.

        We did not have the Symbol.species accessors on our builtin constructors
        marked as configurable. This does not accurately follow the ES6 spec as
        the ES6 spec states that all default accessors on builtins should be
        configurable. This means that we need an additional watchpoint on
        ArrayConstructor to make sure that no users re-configures Symbol.species.

        * runtime/ArrayConstructor.cpp:
        (JSC::ArrayConstructor::finishCreation):
        * runtime/ArrayPrototype.cpp:
        (JSC::speciesConstructArray):
        (JSC::ArrayPrototype::setConstructor):
        (JSC::ArrayPrototypeAdaptiveInferredPropertyWatchpoint::handleFire):
        * runtime/ArrayPrototype.h:
        (JSC::ArrayPrototype::didChangeConstructorOrSpeciesProperties):
        (JSC::ArrayPrototype::didChangeConstructorProperty): Deleted.
        * runtime/JSArrayBufferConstructor.cpp:
        (JSC::JSArrayBufferConstructor::finishCreation):
        * runtime/JSPromiseConstructor.cpp:
        (JSC::JSPromiseConstructor::finishCreation):
        * runtime/JSTypedArrayViewConstructor.cpp:
        (JSC::JSTypedArrayViewConstructor::finishCreation):
        * runtime/MapConstructor.cpp:
        (JSC::MapConstructor::finishCreation):
        * runtime/RegExpConstructor.cpp:
        (JSC::RegExpConstructor::finishCreation):
        * runtime/SetConstructor.cpp:
        (JSC::SetConstructor::finishCreation):
        * tests/stress/array-species-config-array-constructor.js: Added.
        (A):
        * tests/stress/symbol-species.js:
        (testSymbolSpeciesOnConstructor):

2016-02-10  Benjamin Poulain  <benjamin@webkit.org>

        [JSC] The destination of Sqrt should be Def, not UseDef
        https://bugs.webkit.org/show_bug.cgi?id=154086

        Reviewed by Geoffrey Garen.

        An unfortunate copy-paste: the destination of SqrtDouble and SqrtFloat
        was defined as UseDef. As a result, the argument would be interfering
        with everything defined prior.

        * b3/air/AirOpcode.opcodes:

2016-02-10  Chris Dumez  <cdumez@apple.com>

        [Web IDL] interface objects should be Function objects
        https://bugs.webkit.org/show_bug.cgi?id=154038
        <rdar://problem/24569358>

        Reviewed by Geoffrey Garen.

        Update functionProtoFuncToString() to handle JSObjects that
        have the TypeOfShouldCallGetCallData flag and are callable,
        as these behave like functions and use ClassInfo::className()
        as function name in this case.

        * runtime/FunctionPrototype.cpp:
        (JSC::functionProtoFuncToString):

2016-02-10  Chris Dumez  <cdumez@apple.com>

        Attributes on the Window instance should be configurable unless [Unforgeable]
        https://bugs.webkit.org/show_bug.cgi?id=153920
        <rdar://problem/24563211>

        Reviewed by Darin Adler.

        Marking the Window instance attributes as configurable but cause
        getOwnPropertyDescriptor() to report them as configurable, as
        expected. However, trying to delete them would actually lead to
        unexpected behavior because:
        - We did not reify custom accessor properties (most of the Window
          properties are custom accessors) upon deletion.
        - For non-reified static properties marked as configurable,
          JSObject::deleteProperty() would attempt to call the property
          setter with undefined. As a result, calling delete window.name
          would cause window.name to become the string "undefined" instead
          of the undefined value.

        * runtime/JSObject.cpp:
        (JSC::getClassPropertyNames):
        Now that we reify ALL properties, we only need to check the property table
        if we have not reified. As a result, I dropped the 'didReify' parameter for
        this function and instead only call this function if we have not yet reified.

        (JSC::JSObject::putInlineSlow):
        Only call putEntry() if we have not reified: Drop the
        '|| !(entry->attributes() & BuiltinOrFunctionOrAccessor)'
        check as such properties now get reified as well.

        (JSC::JSObject::deleteProperty):
        - Call reifyAllStaticProperties() instead of reifyStaticFunctionsForDelete()
          so that we now reify all properties upon deletion, including the custom
          accessors. reifyStaticFunctionsForDelete() is now removed and the same
          reification function is now used by: deletion, getOwnPropertyDescriptor()
          and eager reification of the prototype objects in the bindings.
        - Drop code that falls back to calling the static property setter with
          undefined if we cannot find the property in the property storage. As
          we now reify ALL properties, the code removing the property from the
          property storage should succeed, provided that the property actually
          exists.

        (JSC::JSObject::getOwnNonIndexPropertyNames):
        Only call getClassPropertyNames() if we have not reified. We should no longer
        check the static property table after reifying now that we reify all
        properties.

        (JSC::JSObject::reifyAllStaticProperties):
        Merge with reifyStaticFunctionsForDelete(). The only behavior change is the
        flattening to an uncacheable dictionary, like reifyStaticFunctionsForDelete()
        used to do.

        * runtime/JSObject.h:

2016-02-10  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r196251.
        https://bugs.webkit.org/show_bug.cgi?id=154078

        Large regression on Dromaeo needs explanation (Requested by
        kling on #webkit).

        Reverted changeset:

        "Visiting a WeakBlock should report bytes visited, since we
        reported them allocated."
        https://bugs.webkit.org/show_bug.cgi?id=153978
        http://trac.webkit.org/changeset/196251

2016-02-10  Csaba Osztrogonác  <ossy@webkit.org>

        REGRESSION(r196331): It made ~180 JSC tests crash on ARMv7 Linux
        https://bugs.webkit.org/show_bug.cgi?id=154064

        Reviewed by Mark Lam.

        * bytecode/PolymorphicAccess.cpp:
        (JSC::AccessCase::generate): Added EABI_32BIT_DUMMY_ARG where it is necessary.
        * dfg/DFGSpeculativeJIT.h: Fixed the comment.
        * jit/CCallHelpers.h:
        (JSC::CCallHelpers::setupArgumentsWithExecState): Added.
        * wasm/WASMFunctionCompiler.h: Fixed the comment.

2016-02-09  Keith Miller  <keith_miller@apple.com>

        calling methods off super in a class constructor should check for TDZ
        https://bugs.webkit.org/show_bug.cgi?id=154060

        Reviewed by Ryosuke Niwa.

        In a class constructor we need to check for TDZ when calling a method
        off the super class. This is because, for super method calls, we use
        the derived class's newly constructed object as the super method's
        this value.

        * bytecompiler/NodesCodegen.cpp:
        (JSC::FunctionCallDotNode::emitBytecode):
        * tests/stress/super-method-calls-check-tdz.js: Added.
        (Base):
        (Derived):
        (test):

2016-02-09  Filip Pizlo  <fpizlo@apple.com>

        Don't crash if we fail to parse a builtin
        https://bugs.webkit.org/show_bug.cgi?id=154047
        rdar://problem/24300617

        Reviewed by Mark Lam.

        Crashing probably seemed like a good idea at the time, but we could get here in case of a
        near stack overflow, so that the parser bails because of recursion.

        * parser/Parser.h:
        (JSC::parse):

2016-02-07  Gavin Barraclough  <barraclough@apple.com>

        GetValueFunc/PutValueFunc should not take both slotBase and thisValue
        https://bugs.webkit.org/show_bug.cgi?id=154009

        Reviewed by Geoff Garen.

        In JavaScript there are two types of properties - regular value properties, and accessor properties.
        One difference between these is how they are reflected by getOwnPropertyDescriptor, and another is
        what object they operate on in the case of a prototype access. If you access a value property of a
        prototype object it return a value pertinent to the prototype, but in the case of a prototype object
        returning an accessor, then the accessor function is applied to the base object of the access.

        JSC supports special 'custom' properties implemented as a c++ callback, and these custom properties
        can be used to implement either value- or accessor-like behavior. getOwnPropertyDescriptor behavior
        is selected via the CustomAccessor attribute. Value- or accessor-like object selection is current
        supported by passing both the slotBase and the thisValue to the callback,and hoping it uses the
        right one. This is probably inefficient, bug-prone, and leads to crazy like JSBoundSlotBaseFunction.

        Instead, just pass one thisValue to the callback functions, consistent with CustomAccessor.

        * API/JSCallbackObject.h:
        * API/JSCallbackObjectFunctions.h:
        (JSC::JSCallbackObject<Parent>::getStaticValue):
        (JSC::JSCallbackObject<Parent>::staticFunctionGetter):
        (JSC::JSCallbackObject<Parent>::callbackGetter):
            - Merged slotBase & thisValue to custom property callbacks.
        * bytecode/PolymorphicAccess.cpp:
        (JSC::AccessCase::generate):
            - Modified the call being JIT generated - GetValueFunc/PutValueFunc now only take 3,
              rather than 4 arguments. Selects which one to keep/drop based on access type.
        (WTF::printInternal):
        * bytecode/PolymorphicAccess.h:
        (JSC::AccessCase::isGet):
        (JSC::AccessCase::isPut):
        (JSC::AccessCase::isIn):
        (JSC::AccessCase::doesCalls):
        (JSC::AccessCase::isGetter):
        * bytecode/PutByIdStatus.cpp:
        (JSC::PutByIdStatus::computeForStubInfo):
        * jit/Repatch.cpp:
        (JSC::tryCacheGetByID):
        (JSC::tryCachePutByID):
            - Split the CustomGetter/Setter access types into Value/Accessor variants.
        * jsc.cpp:
        (WTF::CustomGetter::getOwnPropertySlot):
        (WTF::CustomGetter::customGetter):
        (WTF::RuntimeArray::RuntimeArray):
        (WTF::RuntimeArray::lengthGetter):
            - Merged slotBase & thisValue to custom property callbacks.
        * runtime/CustomGetterSetter.cpp:
        (JSC::callCustomSetter):
            - Pass 3 arguments when calling PutValueFunc.
        * runtime/CustomGetterSetter.h:
        * runtime/JSBoundSlotBaseFunction.cpp:
        (JSC::boundSlotBaseFunctionCall):
        (JSC::JSBoundSlotBaseFunction::JSBoundSlotBaseFunction):
        * runtime/JSCJSValue.cpp:
        (JSC::JSValue::putToPrimitive):
            - callCustomSetter currently takes a flag to distinguish value/accessor calls.
        * runtime/JSFunction.cpp:
        (JSC::retrieveArguments):
        (JSC::JSFunction::argumentsGetter):
        (JSC::retrieveCallerFunction):
        (JSC::JSFunction::callerGetter):
        (JSC::JSFunction::lengthGetter):
        (JSC::JSFunction::nameGetter):
        * runtime/JSFunction.h:
        * runtime/JSModuleNamespaceObject.cpp:
        (JSC::JSModuleNamespaceObject::visitChildren):
        (JSC::callbackGetter):
            - Merged slotBase & thisValue to custom property callbacks.
        * runtime/JSObject.cpp:
        (JSC::JSObject::putInlineSlow):
            - callCustomSetter currently takes a flag to distinguish value/accessor calls.
        * runtime/Lookup.h:
        (JSC::putEntry):
            - split PutPropertySlot setCustom into Value/Accessor variants.
        * runtime/PropertySlot.cpp:
        (JSC::PropertySlot::functionGetter):
        (JSC::PropertySlot::customGetter):
        * runtime/PropertySlot.h:
        (JSC::PropertySlot::PropertySlot):
        (JSC::PropertySlot::getValue):
            - added customGetter helper to call GetValueFunc.
        * runtime/PutPropertySlot.h:
        (JSC::PutPropertySlot::PutPropertySlot):
        (JSC::PutPropertySlot::setNewProperty):
        (JSC::PutPropertySlot::setCustomValue):
        (JSC::PutPropertySlot::setCustomAccessor):
        (JSC::PutPropertySlot::setThisValue):
        (JSC::PutPropertySlot::customSetter):
        (JSC::PutPropertySlot::context):
        (JSC::PutPropertySlot::isStrictMode):
        (JSC::PutPropertySlot::isCacheablePut):
        (JSC::PutPropertySlot::isCacheableSetter):
        (JSC::PutPropertySlot::isCacheableCustom):
        (JSC::PutPropertySlot::isCustomAccessor):
        (JSC::PutPropertySlot::isInitialization):
        (JSC::PutPropertySlot::cachedOffset):
        (JSC::PutPropertySlot::setCustomProperty): Deleted.
            - split PutPropertySlot setCustom into Value/Accessor variants.
        * runtime/RegExpConstructor.cpp:
        (JSC::RegExpConstructor::getOwnPropertySlot):
        (JSC::regExpConstructorDollar1):
        (JSC::regExpConstructorDollar2):
        (JSC::regExpConstructorDollar3):
        (JSC::regExpConstructorDollar4):
        (JSC::regExpConstructorDollar5):
        (JSC::regExpConstructorDollar6):
        (JSC::regExpConstructorDollar7):
        (JSC::regExpConstructorDollar8):
        (JSC::regExpConstructorDollar9):
        (JSC::regExpConstructorInput):
        (JSC::regExpConstructorMultiline):
        (JSC::regExpConstructorLastMatch):
        (JSC::regExpConstructorLastParen):
        (JSC::regExpConstructorLeftContext):
        (JSC::regExpConstructorRightContext):
        (JSC::setRegExpConstructorInput):
        (JSC::setRegExpConstructorMultiline):
        * runtime/RegExpObject.cpp:
        (JSC::RegExpObject::defineOwnProperty):
        (JSC::regExpObjectSetLastIndexStrict):
        (JSC::regExpObjectSetLastIndexNonStrict):
        (JSC::RegExpObject::put):
            - Merged slotBase & thisValue to custom property callbacks.

2016-02-09  Filip Pizlo  <fpizlo@apple.com>

        Spread expressions are not fair game for direct binding
        https://bugs.webkit.org/show_bug.cgi?id=154042
        rdar://problem/24291413

        Reviewed by Saam Barati.

        Prior to this change we crashed on this:

            var [x] = [...y];

        Because NodesCodegen thinks that this is a direct binding.  It's not, because we cannot
        directly generate bytecode for "...y".  This is a unique property of spread expressions, so
        its sufficient to just bail out of direct binding if we see a spread expression. That's what
        this patch does.

        * bytecompiler/NodesCodegen.cpp:
        (JSC::ArrayPatternNode::emitDirectBinding):
        * tests/stress/spread-in-tail.js: Added.
        (foo):
        (catch):

2016-02-09  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r196286.
        https://bugs.webkit.org/show_bug.cgi?id=154026

        Looks like 5% iOS PLT regression (Requested by kling on
        #webkit).

        Reverted changeset:

        "[iOS] Throw away some unlinked code when navigating to a new
        page."
        https://bugs.webkit.org/show_bug.cgi?id=154014
        http://trac.webkit.org/changeset/196286

2016-02-08  Keith Miller  <keith_miller@apple.com>

        Error construction for inlined operations should not use the inliner's CodeBlock
        https://bugs.webkit.org/show_bug.cgi?id=154021

        Reviewed by Mark Lam.

        Previously, if one function, A, was inlined into another function, B, in the DFG/FTL
        we would use B's DFG/FTL CodeBlock to construct source information about the Error.
        We would correctly compute the bytecodeOffset in A for the an expression but we would
        not use one of A's CodeBlocks when looking up source. This caused crashes during
        operationIn as we expected to be able to find the text "in" in the source.

        * runtime/ErrorInstance.cpp:
        (JSC::appendSourceToError):
        * tests/stress/inlined-error-gets-correct-codeblock-for-bytecodeoffset.js: Added.
        (map):
        (n):
        (one):
        (catch):

2016-02-08  Saam Barati  <sbarati@apple.com>

        runtimeTypeForValue should protect against seeing TDZ value
        https://bugs.webkit.org/show_bug.cgi?id=154023
        rdar://problem/24291413

        Reviewed by Michael Saboff.

        There are a few back traces I've seen from crashes that bottom out
        inside runtimeTypeForValue. I haven't been able to reproduce
        any such crash, but it's likely that we're encountering the
        empty JSValue. It's better to just have this function protect
        against seeing the empty value instead of dereferencing a null
        pointer when it thinks the value is a cell.

        * runtime/RuntimeType.cpp:
        (JSC::runtimeTypeForValue):

2016-02-08  Andreas Kling  <akling@apple.com>

        [iOS] Throw away some unlinked code when navigating to a new page.
        <https://webkit.org/b/154014>

        Reviewed by Gavin Barraclough.

        * runtime/VM.cpp:
        (JSC::VM::deleteAllCodeExceptCaches):
        (JSC::VM::deleteAllLinkedCode): Deleted.
        * runtime/VM.h:

2016-02-08  Filip Pizlo  <fpizlo@apple.com>

        B3::foldPathConstants() needs to execute its insertion set
        https://bugs.webkit.org/show_bug.cgi?id=154020

        Reviewed by Saam Barati.

        * b3/B3FoldPathConstants.cpp:
        * b3/testb3.cpp:
        (JSC::B3::testFoldPathEqual): Added this. It used to crash in validation.
        (JSC::B3::run):

2016-02-08  Yusuke Suzuki  <utatane.tea@gmail.com>

        [JSC] Introduce @isObject bytecode intrinsic and use it instead of JS implemented one
        https://bugs.webkit.org/show_bug.cgi?id=153976

        Reviewed by Darin Adler.

        Use bytecode op_is_object directly.

        * builtins/GlobalObject.js:
        (isObject): Deleted.
        * bytecode/BytecodeIntrinsicRegistry.h:
        * bytecompiler/NodesCodegen.cpp:
        (JSC::BytecodeIntrinsicNode::emit_intrinsic_toString):
        (JSC::BytecodeIntrinsicNode::emit_intrinsic_isObject):
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init): Deleted.

2016-02-08  Yusuke Suzuki  <utatane.tea@gmail.com>

        {Map,Set}.prototype.forEach should be visible as own properties
        https://bugs.webkit.org/show_bug.cgi?id=153974

        Reviewed by Darin Adler.

        Now, Map and Set uses builtin tables. We should inlude it in class info.

        * runtime/MapPrototype.cpp:
        * runtime/SetPrototype.cpp:

2016-02-08  Filip Pizlo  <fpizlo@apple.com>

        Baseline JIT should not require its input to be constant-propagated
        https://bugs.webkit.org/show_bug.cgi?id=154011
        rdar://problem/24290933

        Reviewed by Mark Lam.

        * jit/JITArithmetic.cpp:
        (JSC::JIT::emitBitBinaryOpFastPath):
        (JSC::JIT::emitRightShiftFastPath):
        (JSC::JIT::emit_op_add):
        (JSC::JIT::emit_op_div):
        (JSC::JIT::emit_op_mul):

2016-02-08  Filip Pizlo  <fpizlo@apple.com>

        CodeCache should give up on evals if there are variables under TDZ
        https://bugs.webkit.org/show_bug.cgi?id=154002
        rdar://problem/24300998

        Reviewed by Mark Lam.

        Disable the code cache optimization because our approach to TDZ for scoped variables - using
        a separate check_tdz opcode when logically it's the get_from_scope's job to do it - makes
        caching code impossible if there are any variables in TDZ.

        We should do the right thing in the future, and fold the TDZ check into the get_from_scope.
        This is better not only because it will restore caching, but because our bytecode for heap
        accesses is usually at the highest practically doable level of abstraction, so that ICs,
        compilers and caches can see the intended meaning of the bytecode more easily.

        This doesn't appear to slow anything down, but that's just because we don't have enough ES6
        benchmarks. I've filed: https://bugs.webkit.org/show_bug.cgi?id=154010

        * runtime/CodeCache.cpp:
        (JSC::CodeCache::getGlobalCodeBlock):

2016-02-08  Skachkov Oleksandr  <gskachkov@gmail.com>

        [ES6] Arrow function syntax. Using 'super' in arrow function that declared out of the class should lead to Syntax error
        https://bugs.webkit.org/show_bug.cgi?id=150893

        Reviewed by Saam Barati.

        'super' and 'super()' inside of the arrow function should lead to syntax error if they are used 
        out of the class context or they wrapped by ordinary function. Now JSC returns ReferenceError but 
        should return SyntaxError according to the following specs:
        http://www.ecma-international.org/ecma-262/6.0/#sec-function-definitions-static-semantics-early-errors
        and http://www.ecma-international.org/ecma-262/6.0/#sec-arrow-function-definitions-runtime-semantics-evaluation 
        Curren patch implemented only one case when super/super() are used inside of the arrow function
        Case when super/super() are used within the eval:
           class A {} 
           class B extends A { 
               costructor() { eval("super()");} 
           }
        is not part of this patch and will be implemented in this issue https://bugs.webkit.org/show_bug.cgi?id=153864. 
        The same for case when eval with super/super() is invoked in arrow function will be 
        implemented in issue https://bugs.webkit.org/show_bug.cgi?id=153977. 
 
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseFunctionInfo):
        * parser/Parser.h:
        (JSC::Scope::Scope):
        (JSC::Scope::setExpectedSuperBinding):
        (JSC::Scope::expectedSuperBinding):
        (JSC::Scope::setConstructorKind):
        (JSC::Scope::constructorKind):
        (JSC::Parser::closestParentNonArrowFunctionNonLexicalScope):
        * tests/stress/arrowfunction-lexical-bind-supercall-4.js:
        * tests/stress/arrowfunction-lexical-bind-superproperty.js:

2016-02-08  Filip Pizlo  <fpizlo@apple.com>

        Parser should detect error before calls to parseAssignmentExpression()
        https://bugs.webkit.org/show_bug.cgi?id=153975
        rdar://problem/24291231

        Reviewed by Saam Barati.

        Fixes a very hard-to-create situation that an internal test picked up.

        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseVariableDeclarationList):
        (JSC::Parser<LexerType>::parseAssignmentExpression):

2016-02-08  Andreas Kling  <akling@apple.com>

        Visiting a WeakBlock should report bytes visited, since we reported them allocated.
        <https://webkit.org/b/153978>

        Reviewed by Darin Adler.

        When creating a WeakBlock, we tell Heap that we've allocated 1 KB (WeakBlock::blockSize)
        of memory. Consequently, when visiting a WeakBlock, we should also report 1 KB of memory
        visited. Otherwise Heap will think that those 1 KB already went away.

        This was causing us to underestimate heap size, which affects collection scheduling.

        * heap/SlotVisitor.h:
        (JSC::SlotVisitor::reportMemoryVisited):
        * heap/WeakBlock.cpp:
        (JSC::WeakBlock::visit):

2016-02-07  Saam barati  <sbarati@apple.com>

        Follow up patch to: [ES6] bound functions .name property should be "bound " + the target function's name 
        https://bugs.webkit.org/show_bug.cgi?id=153796

        Reviewed by Darin Adler.

        This follow-up patch addresses some comments/suggestions by
        Ryosuke, Darin, and Joe. It simplifies JSBoundFunction::toStringName
        and adds some tests for bound names.

        * runtime/JSBoundFunction.cpp:
        (JSC::hasInstanceBoundFunction):
        (JSC::JSBoundFunction::create):
        (JSC::JSBoundFunction::toStringName):

2016-02-07  Filip Pizlo  <fpizlo@apple.com>

        String.match should defend against matches that would crash the VM
        https://bugs.webkit.org/show_bug.cgi?id=153964
        rdar://problem/24301119

        Reviewed by Saam Barati.

        This fixes a crash in an internal test case.

        * runtime/ArgList.cpp:
        (JSC::MarkedArgumentBuffer::slowAppend): Use best practices to ensure that the size we
            compute makes sense. Crash if it stops making sense, since most users of this API assume
            that they are creating something small enough to fit on the stack.
        * runtime/ArgList.h:
        (JSC::MarkedArgumentBuffer::~MarkedArgumentBuffer):
        (JSC::MarkedArgumentBuffer::size):
        (JSC::MarkedArgumentBuffer::operator new): Deleted. These were ineffective. According to the
            debugger, we were still calling system malloc. So, I changed the code to use fastMalloc()
            directly.
        (JSC::MarkedArgumentBuffer::operator delete): Deleted.
        * runtime/StringPrototype.cpp:
        (JSC::stringProtoFuncMatch): Explicitly defend against absurd sizes. Of course, it's still
            possible to crash the VM on OOME. That's sort of always been the philosophy of JSC - we
            don't guarantee that you'll get a nice-looking error whenever you run out of memory,
            since in a GC'd environment you can't really guarantee those things. But, if you have a
            match that obvious won't fit in memory, then reporting an error is useful in case this is
            a developer experimenting with a buggy regexp.

2016-02-07  Dan Bernstein  <mitz@apple.com>

        [Cocoa] Replace __has_include guards around inclusion of Apple-internal-SDK headers with USE(APPLE_INTERNAL_SDK)
        https://bugs.webkit.org/show_bug.cgi?id=153963

        Reviewed by Sam Weinig.

        * inspector/remote/RemoteInspectorXPCConnection.mm:

2016-02-06  Filip Pizlo  <fpizlo@apple.com>

        FTL must store the call site index before runtime calls, even if it's the tail call slow path
        https://bugs.webkit.org/show_bug.cgi?id=153955
        rdar://problem/24290970

        Reviewed by Saam Barati.

        This is necessary because you could throw an exception in a host call on the tail call's slow
        path. That'll route us to lookupExceptionHandler(), which unwinds starting with the call site
        index of our frame. Bad things happen if it's not set. Prior to this patch it was possible
        for the call site index field to be uninitialized, which meant that the throwing machinery
        was making a wild guess about where we are.

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileTailCall):
        * tests/stress/tail-call-host-call-throw.js: Added.

2016-02-06  Darin Adler  <darin@apple.com>

        Finish auditing call sites of upper() and lower(), eliminate many, and rename the functions
        https://bugs.webkit.org/show_bug.cgi?id=153905

        Reviewed by Sam Weinig.

        * runtime/IntlObject.cpp:
        (JSC::canonicalLangTag): Use converToASCIIUppercase on the language tag.

        * runtime/StringPrototype.cpp:
        (JSC::stringProtoFuncToLowerCase): Tweak style and update for name change.
        (JSC::stringProtoFuncToUpperCase): Ditto.

2016-02-06  Chris Dumez  <cdumez@apple.com>

        Object.getOwnPropertyDescriptor() does not work on sub-frame's window
        https://bugs.webkit.org/show_bug.cgi?id=153925

        Reviewed by Darin Adler.

        Calling Object.getOwnPropertyDescriptor() on a sub-frame's window was
        returning undefined for that window's own properties. The reason was
        that the check getOwnPropertySlot() is using to make sure the
        PropertySlot is not for a property coming from the prototype was wrong.

        The check was checking that 'this != slotBase' which works fine unless
        this is a JSProxy (e.g. JSDOMWindowShell). To handle proxies, the code
        was also checking that 'slotBase.toThis() != this', attempting to
        get the slotBase/Window's proxy. However, due to the implementation of
        toThis(), we were getting the lexical global object's proxy instead of
        slotBase's proxy. To avoid this issue, the new code explicitly checks
        if 'this' is a JSProxy and makes sure 'JSProxy::target() != slotBase',
        instead of using toThis().

        * runtime/JSObject.cpp:
        (JSC::JSObject::getOwnPropertyDescriptor):

2016-02-06  Andreas Kling  <akling@apple.com>

        [iOS] Throw away linked code when navigating to a new page.
        <https://webkit.org/b/153851>

        Reviewed by Gavin Barraclough.

        Add a VM API for throwing away linked code only.

        * runtime/VM.cpp:
        (JSC::VM::deleteAllLinkedCode):
        * runtime/VM.h:

2016-02-06  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r196104.
        https://bugs.webkit.org/show_bug.cgi?id=153940

        Regressed Speedometer on iOS (Requested by kling on #webkit).

        Reverted changeset:

        "[iOS] Throw away linked code when navigating to a new page."
        https://bugs.webkit.org/show_bug.cgi?id=153851
        http://trac.webkit.org/changeset/196104

2016-02-05  Alex Christensen  <achristensen@webkit.org>

        Fix internal Windows build
        https://bugs.webkit.org/show_bug.cgi?id=153930
        <rdar://problem/24534864>

        Reviewed by Mark Lam.

        * JavaScriptCore.vcxproj/JavaScriptCore.proj:
        I made a typo in r196144.

2016-02-05  Saam barati  <sbarati@apple.com>

        Web Inspector: Include SamplingProfiler's expression-level data for stack frames in the protocol
        https://bugs.webkit.org/show_bug.cgi?id=153455
        <rdar://problem/24335884>

        Reviewed by Joseph Pecoraro.

        We now send the sampling profiler's expression-level
        line/column info in the inspector protocol.

        * inspector/agents/InspectorScriptProfilerAgent.cpp:
        (Inspector::buildSamples):
        * inspector/protocol/ScriptProfiler.json:
        * runtime/SamplingProfiler.h:
        (JSC::SamplingProfiler::StackFrame::hasExpressionInfo):

2016-02-05  Saam barati  <sbarati@apple.com>

        follow-up to: JSC Sampling Profiler: (host) is confusing in cases where I would expect to see JS name
        https://bugs.webkit.org/show_bug.cgi?id=153663
        <rdar://problem/24415092>

        Rubber stamped by Joseph Pecoraro.

        We were performing operations that required us to
        hold the VM lock even when we might not have been holding it.
        We now ensure we're holding it.

        * inspector/agents/InspectorScriptProfilerAgent.cpp:
        (Inspector::InspectorScriptProfilerAgent::trackingComplete):

2016-02-05  Filip Pizlo  <fpizlo@apple.com>

        Arrayify for a typed array shouldn't create a monster
        https://bugs.webkit.org/show_bug.cgi?id=153908
        rdar://problem/24290639

        Reviewed by Mark Lam.

        Previously if you convinced the DFG to emit an Arrayify to ArrayStorage and then gave it a
        typed array, you'd corrupt the object.

        * runtime/JSArrayBufferView.cpp:
        (WTF::printInternal):
        * runtime/JSArrayBufferView.h:
        * runtime/JSGenericTypedArrayViewInlines.h:
        (JSC::JSGenericTypedArrayView<Adaptor>::visitChildren):
        (JSC::JSGenericTypedArrayView<Adaptor>::slowDownAndWasteMemory):
        * runtime/JSObject.cpp:
        (JSC::JSObject::copyButterfly):
        (JSC::JSObject::enterDictionaryIndexingMode):
        (JSC::JSObject::ensureInt32Slow):
        (JSC::JSObject::ensureDoubleSlow):
        (JSC::JSObject::ensureContiguousSlow):
        (JSC::JSObject::ensureArrayStorageSlow):
        (JSC::JSObject::growOutOfLineStorage):
        (JSC::getBoundSlotBaseFunctionForGetterSetter):
        * runtime/Structure.h:
        * tests/stress/arrayify-array-storage-typed-array.js: Added. This test failed.
        * tests/stress/arrayify-int32-typed-array.js: Added. This test case already had other protections, but we beefed them up.

2016-02-04  Joseph Pecoraro  <pecoraro@apple.com>

        Web Inspector: InspectorTimelineAgent doesn't need to recompile functions because it now uses the sampling profiler
        https://bugs.webkit.org/show_bug.cgi?id=153500
        <rdar://problem/24352458>

        Reviewed by Timothy Hatcher.

        Be more explicit about enabling legacy profiling.

        * jsc.cpp:
        * runtime/Executable.cpp:
        (JSC::ScriptExecutable::newCodeBlockFor):
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::hasLegacyProfiler):
        (JSC::JSGlobalObject::createProgramCodeBlock):
        (JSC::JSGlobalObject::createEvalCodeBlock):
        (JSC::JSGlobalObject::createModuleProgramCodeBlock):
        (JSC::JSGlobalObject::hasProfiler): Deleted.
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::supportsLegacyProfiling):
        (JSC::JSGlobalObject::supportsProfiling): Deleted.

2016-02-04  Keith Miller  <keith_miller@apple.com>

        ArrayPrototype should have a destroy function
        https://bugs.webkit.org/show_bug.cgi?id=153847

        Reviewed by Filip Pizlo.

        ArrayPrototype should have an destroy function as it now has a unique_ptr member that
        needs to be freed at the end of the object's life cycle. Also, this patch adds an
        option, gcAtEnd, that will cause jsc.cpp to do a garbage collection before exiting.

        * jsc.cpp:
        (runJSC):
        (jscmain):
        * runtime/ArrayPrototype.cpp:
        (JSC::ArrayPrototype::create):
        (JSC::ArrayPrototype::destroy):
        * runtime/ArrayPrototype.h:
        * runtime/Options.h:

2016-02-04  Filip Pizlo  <fpizlo@apple.com>

        REGRESSION(192409): Cannot rely on add32() to zero-extend
        https://bugs.webkit.org/show_bug.cgi?id=153897

        Unreviewed rollout of r192409.

        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::add32):
        (JSC::MacroAssemblerARM64::add64):
        * assembler/MacroAssemblerARMv7.h:
        (JSC::MacroAssemblerARMv7::add32):
        * assembler/MacroAssemblerX86.h:
        (JSC::MacroAssemblerX86::add32):
        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::add32):
        (JSC::MacroAssemblerX86Common::add8):
        (JSC::MacroAssemblerX86Common::branchAdd32):
        (JSC::MacroAssemblerX86Common::generateTest32):
        (JSC::MacroAssemblerX86Common::clz32AfterBsr):
        (JSC::MacroAssemblerX86Common::add32AndSetFlags): Deleted.
        * assembler/MacroAssemblerX86_64.h:
        (JSC::MacroAssemblerX86_64::add32):
        (JSC::MacroAssemblerX86_64::add64):
        (JSC::MacroAssemblerX86_64::branchAdd64):
        (JSC::MacroAssemblerX86_64::repatchCall):
        (JSC::MacroAssemblerX86_64::clz64AfterBsr):
        (JSC::MacroAssemblerX86_64::add64AndSetFlags): Deleted.

2016-02-04  Andreas Kling  <akling@apple.com>

        Remove dead ENABLE(BYTECODE_COMMENTS) cruft.
        <https://webkit.org/b/153888>

        Reviewed by Antti Koivisto.

        * bytecode/UnlinkedCodeBlock.cpp:
        (JSC::UnlinkedCodeBlock::UnlinkedCodeBlock): Deleted.
        * bytecode/UnlinkedCodeBlock.h:
        (JSC::UnlinkedCodeBlock::shrinkToFit): Deleted.

2016-02-04  Saam barati  <sbarati@apple.com>

        JSC Sampling Profiler: (host) is confusing in cases where I would expect to see JS name
        https://bugs.webkit.org/show_bug.cgi?id=153663
        <rdar://problem/24415092>

        Reviewed by Geoffrey Garen.

        We now collect the Callee in the processed StackFrame
        when the Callee is a valid GC object. We later ask
        the Callee for it's .displayName or .name property.
        When we don't have a valid callee, we will still
        use the Executable for this information.

        This helps us come up with good names for frames where 
        the Callee object is a bound function or an InternalFunction.

        * inspector/agents/InspectorScriptProfilerAgent.cpp:
        (Inspector::InspectorScriptProfilerAgent::addEvent):
        (Inspector::buildSamples):
        (Inspector::InspectorScriptProfilerAgent::trackingComplete):
        * runtime/SamplingProfiler.cpp:
        (JSC::reportStats):
        (JSC::FrameWalker::walk):
        (JSC::SamplingProfiler::processUnverifiedStackTraces):
        (JSC::SamplingProfiler::visit):
        (JSC::SamplingProfiler::shutdown):
        (JSC::SamplingProfiler::clearData):
        (JSC::SamplingProfiler::StackFrame::nameFromCallee):
        (JSC::SamplingProfiler::StackFrame::displayName):
        (JSC::SamplingProfiler::StackFrame::displayNameForJSONTests):
        (JSC::SamplingProfiler::stackTracesAsJSON):
        * runtime/SamplingProfiler.h:
        (JSC::SamplingProfiler::UnprocessedStackFrame::UnprocessedStackFrame):
        (JSC::SamplingProfiler::StackFrame::StackFrame):
        * tests/stress/sampling-profiler-basic.js:
        (platformSupportsSamplingProfiler.nothing):
        (platformSupportsSamplingProfiler.top):
        * tests/stress/sampling-profiler-bound-function-name.js: Added.
        (platformSupportsSamplingProfiler.foo):
        (platformSupportsSamplingProfiler.bar):
        (platformSupportsSamplingProfiler.let.baz):
        (platformSupportsSamplingProfiler):
        * tests/stress/sampling-profiler-display-name.js: Added.
        (platformSupportsSamplingProfiler.foo):
        (platformSupportsSamplingProfiler.baz):
        (platformSupportsSamplingProfiler.):
        (platformSupportsSamplingProfiler.bar):
        (platformSupportsSamplingProfiler.jaz):
        (platformSupportsSamplingProfiler.makeFunction.let.result):
        (platformSupportsSamplingProfiler.makeFunction):
        * tests/stress/sampling-profiler-internal-function-name.js: Added.
        (platformSupportsSamplingProfiler.foo):
        (platformSupportsSamplingProfiler.bar):
        (platformSupportsSamplingProfiler):

2016-02-04  Chris Dumez  <cdumez@apple.com>

        Object.getOwnPropertyDescriptor() returns incomplete descriptor for instance properties
        https://bugs.webkit.org/show_bug.cgi?id=153817

        Reviewed by Geoffrey Garen.

        Extend support for Object.getOwnPropertyDescriptor() on native bindings
        to instance properties (e.g. Unforgeable properties or Global object
        properties) so that the returned descriptor has getter / setter
        functions, as expected.

        * runtime/JSObject.cpp:
        (JSC::JSObject::reifyAllStaticProperties):
        Add method that reifies all static properties, including the custom
        accessors. This is similar to what is done eagerly on the prototype
        objects in the bindings code.

        (JSC::JSObject::getOwnPropertyDescriptor):
        getOwnPropertyDescriptor() would previously fails for custom accessors
        that are on the instance because getDirect() does not check the static
        property table and those custom accessors were not reified (We only
        reified all properties eagerly - including custom accessors - on
        prototype objects. To address this issue, we now call
        reifyAllStaticProperties() if the call to getDirect() fails and then
        call getDirect() again. This fix is however insufficient for Window
        properties because |this| is a JSDOMWindowShell / JSProxy in this case
        and getDirect() / reifyAllStaticProperties() would fail as the proxy
        does not actually have the properties. This issue was addressed by
        checking if |this| is a JSProxy and then using JSProxy::target() instead
        of |this| for the calls to getDirect() and for the reification.

        * runtime/JSObject.h:
        * runtime/Lookup.h:
        (JSC::reifyStaticProperty):
        (JSC::reifyStaticProperties):
        Move most code in reifyStaticProperties() to a separate function so the
        code can be shared with JSObject::reifyAllStaticProperties().
        reifyStaticProperties() is currently called by the bindings on the
        prototype objects.

2016-02-04  Alex Christensen  <achristensen@webkit.org>

        Fix internal Windows build
        https://bugs.webkit.org/show_bug.cgi?id=153886
        <rdar://problem/24499887>

        Reviewed by Mark Lam.

        * JavaScriptCore.vcxproj/JavaScriptCore.proj:
        In r190253 I changed the directory of the headers from AppleInternal/include/JavaScriptCore 
        to AppleInternal/include/private/JavaScriptCore.  This is ok for WebCore and WebKit, but not
        other projects, such as CFNetwork, which expect the public API headers to be in the old location.
        This used to be done by a combination of copy-files.cmd and the old JavaScriptCore.proj.
        This change copies all the API headers, which copies everything in copy-files.cmd except APIShims.h
        which does not exist any more.  It copies additional headers that were not copied before, but
        I think this is beneficial so we do not forget to add new public headers to a list of public headers
        to be copied in the internal build.  Having extra public headers in the internal Windows build is
        not a problem because only internal clients use the internal Windows build.

2016-02-03  Yusuke Suzuki  <utatane.tea@gmail.com>

        [JSC] Make some classes non JSDestructibleObject
        https://bugs.webkit.org/show_bug.cgi?id=153838

        Reviewed by Geoffrey Garen.

        SymbolPrototype, JSMapIterator and JSSetIterator are trivially destructible.
        So there is no need to inherit JSDestructibleObject.

        * runtime/JSMapIterator.cpp:
        (JSC::JSMapIterator::destroy): Deleted.
        * runtime/JSMapIterator.h:
        * runtime/JSSetIterator.cpp:
        (JSC::JSSetIterator::destroy): Deleted.
        * runtime/JSSetIterator.h:
        * runtime/MapData.h:
        * runtime/SymbolPrototype.h:

2016-02-03  Yusuke Suzuki  <utatane.tea@gmail.com>

        [JSC] Symbol structure has unnecessary flags
        https://bugs.webkit.org/show_bug.cgi?id=153840

        Reviewed by Saam Barati.

        * runtime/Symbol.h:
        * tests/stress/symbol-get-own-property.js: Added.
        (shouldBe):

2016-02-03  Andreas Kling  <akling@apple.com>

        [iOS] Throw away linked code when navigating to a new page.
        <https://webkit.org/b/153851>

        Reviewed by Gavin Barraclough.

        Add a VM API for throwing away linked code only.

        * runtime/VM.cpp:
        (JSC::VM::deleteAllLinkedCode):
        * runtime/VM.h:

2016-02-03  Michael Catanzaro  <mcatanzaro@igalia.com>

        [GTK][EFL] Switch FTL to B3
        https://bugs.webkit.org/show_bug.cgi?id=153478

        Reviewed by Csaba Osztrogonác.

        Conditionalize code to make it possible to build FTL completely without LLVM.

        * CMakeLists.txt:
        * dfg/DFGCommon.h:
        * dfg/DFGPlan.cpp:
        (JSC::DFG::Plan::compileInThreadImpl):
        * ftl/FTLAbbreviatedTypes.h:
        * ftl/FTLFail.cpp:
        (JSC::FTL::fail):
        * ftl/FTLState.cpp:
        (JSC::FTL::State::State):
        (JSC::FTL::State::~State):

2016-02-03  Carlos Garcia Campos  <cgarcia@igalia.com>

        Unreviewed. Fix JavaScriptCore build with B3 enabled.

        Include <limits.h> for UINT_MAX.

        * b3/B3StackSlot.h:
        * b3/air/AirStackSlot.h:

2016-02-02  Caitlin Potter  <caitp@igalia.com>

        JSSymbolTableObject::deleteProperty() crashes deleting Symbols
        https://bugs.webkit.org/show_bug.cgi?id=153816

        Reviewed by Darin Adler.

        Changes JSSymbolTableObject::deleteProperty() to check if its
        symbolTable() contains the property's uid() rather than publicName().
        This ensures that it will not crash in the case of Symbols.

        * runtime/JSSymbolTableObject.cpp:
        (JSC::JSSymbolTableObject::deleteProperty):
        * tests/es6/Object_static_methods_Object.getOwnPropertyDescriptors.js:
        (testGlobalProxy):
        * tests/stress/regress-153816.js: Added.
        (deleteSymbolFromJSSymbolTableObject):

2016-02-02  Benjamin Poulain  <benjamin@webkit.org>

        [JSC] Do not copy FP when lowering FramePointer
        https://bugs.webkit.org/show_bug.cgi?id=153769

        Reviewed by Michael Saboff.

        That extra move is just wasted time. The fewer Moves we have,
        the happier IRC is.

        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::tmp):
        (JSC::B3::Air::LowerToAir::lower):

2016-02-02  Keith Miller  <keith_miller@apple.com>

        DFG, FTL, B3, and Air should all have a unique option for printing their graphs
        https://bugs.webkit.org/show_bug.cgi?id=153815

        Reviewed by Benjamin Poulain.

        This patch adds a new printing option for each of the DFG/FTL compilation phases.

        * b3/B3Common.cpp:
        (JSC::B3::shouldDumpIR):
        (JSC::B3::shouldDumpIRAtEachPhase):
        * b3/B3Common.h:
        * b3/B3Generate.cpp:
        (JSC::B3::generateToAir):
        * b3/B3PhaseScope.cpp:
        (JSC::B3::PhaseScope::PhaseScope):
        * b3/air/AirGenerate.cpp:
        (JSC::B3::Air::prepareForGeneration):
        * b3/air/AirPhaseScope.cpp:
        (JSC::B3::Air::PhaseScope::PhaseScope):
        * dfg/DFGCFAPhase.cpp:
        (JSC::DFG::CFAPhase::run):
        * dfg/DFGCommon.h:
        (JSC::DFG::shouldDumpGraphAtEachPhase):
        * dfg/DFGPhase.cpp:
        (JSC::DFG::Phase::beginPhase):
        * runtime/Options.cpp:
        (JSC::recomputeDependentOptions):
        * runtime/Options.h:

2016-02-02  Caitlin Potter  <caitp@igalia.com>

        [JSC] make Object.getOwnPropertyDescriptors() work with non-JSObject types
        https://bugs.webkit.org/show_bug.cgi?id=153814

        Reviewed by Yusuke Suzuki.

        * runtime/ObjectConstructor.cpp:
        (JSC::objectConstructorGetOwnPropertyDescriptors):
        * tests/es6/Object_static_methods_Object.getOwnPropertyDescriptors.js:
        (testGlobalProxy):

2016-02-02  Aakash Jain  <aakash_jain@apple.com>

        Remove references to CallFrameInlines.h
        https://bugs.webkit.org/show_bug.cgi?id=153810

        Reviewed by Mark Lam.

        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:

2016-02-02  Caitlin Potter  <caitp@igalia.com>

        [JSC] Implement Object.getOwnPropertyDescriptors() proposal
        https://bugs.webkit.org/show_bug.cgi?id=153799

        Reviewed by Darin Adler.

        Implements the Object.getOwnPropertyDescriptors() proposal, which
        reached Stage 3 in the TC39 process in January 2016.
        https://github.com/tc39/proposal-object-getownpropertydescriptors

        The method extracts a set of property descriptor objects, which can
        be safely used via `Object.create()`.

        * runtime/ObjectConstructor.cpp:
        (JSC::objectConstructorGetOwnPropertyDescriptors):

2016-02-02  Filip Pizlo  <fpizlo@apple.com>

        B3 should be able to compile trivial self-loops
        https://bugs.webkit.org/show_bug.cgi?id=153802
        rdar://problem/24465632

        Reviewed by Michael Saboff.

        Tail-duplicating a self-loop would mean doing a kind of loop unrolling. It wouldn't be
        profitable even if it did work. It turns out that it doesn't work, because we edit the target
        block before reading the source block, which breaks if the target and source block are the
        same.

        This disables tail duplication of self-loops, adds a test, and adds better validation for this
        issue.

        * b3/B3DuplicateTails.cpp:
        * b3/B3Procedure.cpp:
        (JSC::B3::Procedure::resetReachability):
        * b3/testb3.cpp:
        (JSC::B3::testComputeDivisionMagic):
        (JSC::B3::testTrivialInfiniteLoop):
        (JSC::B3::zero):
        (JSC::B3::run):

2016-02-02  Saam barati  <sbarati@apple.com>

        [ES6] bound functions .name property should be "bound " + the target function's name
        https://bugs.webkit.org/show_bug.cgi?id=153796

        Reviewed by Mark Lam.

        See http://tc39.github.io/ecma262/#sec-function.prototype.bind for details.
        What the spec says:
        ```
        function foo() { }
        foo.bind(null).name === "bound foo"

        (function bar() { }).bind(null).name === "bound bar"
        ```

        * runtime/FunctionPrototype.cpp:
        (JSC::functionProtoFuncToString):
        * runtime/JSBoundFunction.cpp:
        (JSC::hasInstanceBoundFunction):
        (JSC::JSBoundFunction::create):
        (JSC::JSBoundFunction::visitChildren):
        (JSC::JSBoundFunction::toStringName):
        * runtime/JSBoundFunction.h:
        (JSC::JSBoundFunction::boundThis):
        (JSC::JSBoundFunction::boundArgs):
        (JSC::JSBoundFunction::createStructure):
        * tests/es6.yaml:

2016-02-02  Filip Pizlo  <fpizlo@apple.com>

        Get rid of anonymous stack slots
        https://bugs.webkit.org/show_bug.cgi?id=151128

        Reviewed by Mark Lam.

        When I first designed stack slots, the idea was that an "anonymous" stack slot was one that
        behaved exactly like a C variable: if it never escaped, it would not need to get stack space
        for the entire lifetime of the function - it could get any slab of stack so long as it
        didn't interfere with other stack slots that would be live at the same time. The reason I
        called them "anonymous" is that external code could not get its address. This felt like it
        gave the stack slot anonymity. But it was never a good name for this concept.

        Then I had the register allocator lower temporaries to anonymous stack slots when it spilled
        them. Spilling became the sole client of anonymous stack slots.

        Then I realized that there was an aspect of how spill slots work that make them want
        slightly different semantics than a normal C variable. A C variable is a proper memory
        location - you could do a store to only some bytes in the variable, and it's reasonable to
        expect that this will not destroy the other bytes in the variable. But that means that to
        compute their liveness, you have to do something like a per-byte liveness. That's overkill
        for spill slots. You want any store to the spill slot to kill the whole slot even if it
        writes to just part of the slot. This matches how temporaries work. So rather than implement
        per-byte liveness, I decided to change the semantics of anonymous stack slots to make them
        work like how I wanted spill slots to work. This was quite dirty, and put B3 in the awkward
        situation that B3's anonymous stack slots behaved like spill slots. But it was OK since
        nobody used anonymous stack slots in B3.

        Then I added tail duplication, which required having a mechanism for introducing non-SSA
        variables in B3. I decided to use anonymous stack slots for this purpose. All of a sudden
        this all felt like it made sense: anonymous stack slots were just like variables! Hooray for
        the amazing foresight of anonymous stack slots!

        But then I realized that this was all very bad. We want B3 to be able to optimize Store and
        Load operations by reasoning about how they affect bytes in memory. For example, if you do
        a Load of a 64-bit value, and then you modify just the low 32 bits of that value, and then
        you do a 64-bit store back to the same location, then it would be better to transform this
        into 32-bit operations. We don't do this optimization yet, but it's the kind of thing that
        we want B3 to be able to do. To do it, we need Store to mean that it only affects N bytes
        starting at the pointer, where N is the size of the thing being stored. But that's not what
        Store means for anonymous stack slots. For anonymous slots, storing to any byte in the slot
        clobbers all bytes in the slot. We were never clear if you need to store directly to an
        anonymous slot to get this behavior, or if any pointer that points to an anoymous slot must
        exhibit this behavior when stored to. Neither kinds of semantics make sense to me.

        This change fixes the problem by eradicating anonymous stack slots. In B3, they are replaced
        with Variables. In Air, they are replaced with a different stack slot kind, called Spill.
        There is no such thing as stack slot kinds in B3 anymore, all B3 stack slots are locked. In
        Air, there is still the concept of stack slot kind - Locked or Spill.

        B3 Variables are awesome. They are exactly what they seem to be. They have a type. They are
        declared at the top level in the Procedure. You can access them with new opcodes, Get and
        Set. This greatly simplifies demoting SSA values to variables and promoting them back to
        SSA. I even made the instruction selector do the right things for variables, which means
        that introducing variables won't hurt instruction selection (there will be extra moves, but
        IRC will kill them). It's great to have non-SSA variables as an explicit concept in IR
        because it means that you don't have to do any magic to use them - they Just Work.

        Air spill slots behave almost like anonymous stack slots, with one exception: you cannot
        escape them. We validate this by making it illegal to UseAddr on a spill slot. This removes
        the need to answer awkward questions like: does a 32-bit Def on a pointer that may point to
        a 64-bit spill slot do anything to the 32 bits above the pointer?  Does it write zero to it?
        Does it write zero to it just when the pointer actually points to a spill slot or always?
        These are silly questions, and we don't have to answer them because the only way to refer to
        a spill slot is directly. No escaping means no aliasing.

        This doesn't affect performance. It just makes the compiler more fun to work with by
        removing some cognitive dissonance.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/B3ArgumentRegValue.h:
        * b3/B3CCallValue.h:
        * b3/B3CheckValue.cpp:
        (JSC::B3::CheckValue::cloneImpl):
        (JSC::B3::CheckValue::CheckValue):
        * b3/B3CheckValue.h:
        * b3/B3Const32Value.h:
        * b3/B3Const64Value.h:
        * b3/B3ConstDoubleValue.h:
        * b3/B3ConstFloatValue.h:
        * b3/B3ConstPtrValue.h:
        (JSC::B3::ConstPtrValue::ConstPtrValue):
        * b3/B3ControlValue.cpp:
        (JSC::B3::ControlValue::convertToJump):
        (JSC::B3::ControlValue::convertToOops):
        (JSC::B3::ControlValue::dumpMeta):
        * b3/B3ControlValue.h:
        * b3/B3Effects.cpp:
        (JSC::B3::Effects::interferes):
        (JSC::B3::Effects::dump):
        * b3/B3Effects.h:
        (JSC::B3::Effects::mustExecute):
        * b3/B3EliminateCommonSubexpressions.cpp:
        * b3/B3FixSSA.cpp:
        (JSC::B3::demoteValues):
        (JSC::B3::fixSSA):
        * b3/B3FixSSA.h:
        * b3/B3IndexMap.h:
        (JSC::B3::IndexMap::resize):
        (JSC::B3::IndexMap::clear):
        (JSC::B3::IndexMap::size):
        (JSC::B3::IndexMap::operator[]):
        * b3/B3IndexSet.h:
        (JSC::B3::IndexSet::contains):
        (JSC::B3::IndexSet::size):
        (JSC::B3::IndexSet::isEmpty):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::run):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3MemoryValue.h:
        * b3/B3Opcode.cpp:
        (WTF::printInternal):
        * b3/B3Opcode.h:
        * b3/B3PatchpointValue.cpp:
        (JSC::B3::PatchpointValue::cloneImpl):
        (JSC::B3::PatchpointValue::PatchpointValue):
        * b3/B3PatchpointValue.h:
        * b3/B3Procedure.cpp:
        (JSC::B3::Procedure::Procedure):
        (JSC::B3::Procedure::addBlock):
        (JSC::B3::Procedure::addStackSlot):
        (JSC::B3::Procedure::addVariable):
        (JSC::B3::Procedure::clone):
        (JSC::B3::Procedure::addIntConstant):
        (JSC::B3::Procedure::dump):
        (JSC::B3::Procedure::deleteStackSlot):
        (JSC::B3::Procedure::deleteVariable):
        (JSC::B3::Procedure::deleteValue):
        (JSC::B3::Procedure::deleteOrphans):
        (JSC::B3::Procedure::calleeSaveRegisters):
        (JSC::B3::Procedure::addValueImpl):
        (JSC::B3::Procedure::setBlockOrderImpl):
        (JSC::B3::Procedure::addAnonymousStackSlot): Deleted.
        (JSC::B3::Procedure::addStackSlotIndex): Deleted.
        (JSC::B3::Procedure::addValueIndex): Deleted.
        * b3/B3Procedure.h:
        (JSC::B3::Procedure::setBlockOrder):
        (JSC::B3::Procedure::stackSlots):
        (JSC::B3::Procedure::variables):
        (JSC::B3::Procedure::values):
        (JSC::B3::Procedure::StackSlotsCollection::StackSlotsCollection): Deleted.
        (JSC::B3::Procedure::StackSlotsCollection::size): Deleted.
        (JSC::B3::Procedure::StackSlotsCollection::at): Deleted.
        (JSC::B3::Procedure::StackSlotsCollection::operator[]): Deleted.
        (JSC::B3::Procedure::StackSlotsCollection::iterator::iterator): Deleted.
        (JSC::B3::Procedure::StackSlotsCollection::iterator::operator*): Deleted.
        (JSC::B3::Procedure::StackSlotsCollection::iterator::operator++): Deleted.
        (JSC::B3::Procedure::StackSlotsCollection::iterator::operator==): Deleted.
        (JSC::B3::Procedure::StackSlotsCollection::iterator::operator!=): Deleted.
        (JSC::B3::Procedure::StackSlotsCollection::iterator::findNext): Deleted.
        (JSC::B3::Procedure::StackSlotsCollection::begin): Deleted.
        (JSC::B3::Procedure::StackSlotsCollection::end): Deleted.
        (JSC::B3::Procedure::ValuesCollection::ValuesCollection): Deleted.
        (JSC::B3::Procedure::ValuesCollection::iterator::iterator): Deleted.
        (JSC::B3::Procedure::ValuesCollection::iterator::operator*): Deleted.
        (JSC::B3::Procedure::ValuesCollection::iterator::operator++): Deleted.
        (JSC::B3::Procedure::ValuesCollection::iterator::operator==): Deleted.
        (JSC::B3::Procedure::ValuesCollection::iterator::operator!=): Deleted.
        (JSC::B3::Procedure::ValuesCollection::iterator::findNext): Deleted.
        (JSC::B3::Procedure::ValuesCollection::begin): Deleted.
        (JSC::B3::Procedure::ValuesCollection::end): Deleted.
        (JSC::B3::Procedure::ValuesCollection::size): Deleted.
        (JSC::B3::Procedure::ValuesCollection::at): Deleted.
        (JSC::B3::Procedure::ValuesCollection::operator[]): Deleted.
        * b3/B3ProcedureInlines.h:
        (JSC::B3::Procedure::add):
        * b3/B3ReduceStrength.cpp:
        * b3/B3SlotBaseValue.h:
        * b3/B3SparseCollection.h: Added.
        (JSC::B3::SparseCollection::SparseCollection):
        (JSC::B3::SparseCollection::add):
        (JSC::B3::SparseCollection::addNew):
        (JSC::B3::SparseCollection::remove):
        (JSC::B3::SparseCollection::size):
        (JSC::B3::SparseCollection::isEmpty):
        (JSC::B3::SparseCollection::at):
        (JSC::B3::SparseCollection::operator[]):
        (JSC::B3::SparseCollection::iterator::iterator):
        (JSC::B3::SparseCollection::iterator::operator*):
        (JSC::B3::SparseCollection::iterator::operator++):
        (JSC::B3::SparseCollection::iterator::operator==):
        (JSC::B3::SparseCollection::iterator::operator!=):
        (JSC::B3::SparseCollection::iterator::findNext):
        (JSC::B3::SparseCollection::begin):
        (JSC::B3::SparseCollection::end):
        * b3/B3StackSlot.cpp:
        (JSC::B3::StackSlot::deepDump):
        (JSC::B3::StackSlot::StackSlot):
        * b3/B3StackSlot.h:
        (JSC::B3::StackSlot::byteSize):
        (JSC::B3::StackSlot::index):
        (JSC::B3::StackSlot::setOffsetFromFP):
        (JSC::B3::StackSlot::kind): Deleted.
        (JSC::B3::StackSlot::isLocked): Deleted.
        * b3/B3StackSlotKind.cpp: Removed.
        * b3/B3StackSlotKind.h: Removed.
        * b3/B3StackmapValue.cpp:
        (JSC::B3::StackmapValue::dumpMeta):
        (JSC::B3::StackmapValue::StackmapValue):
        * b3/B3StackmapValue.h:
        * b3/B3SwitchValue.cpp:
        (JSC::B3::SwitchValue::cloneImpl):
        (JSC::B3::SwitchValue::SwitchValue):
        * b3/B3SwitchValue.h:
        * b3/B3UpsilonValue.h:
        * b3/B3Validate.cpp:
        * b3/B3Value.cpp:
        (JSC::B3::Value::replaceWithIdentity):
        (JSC::B3::Value::replaceWithNop):
        (JSC::B3::Value::replaceWithPhi):
        (JSC::B3::Value::dump):
        (JSC::B3::Value::effects):
        (JSC::B3::Value::checkOpcode):
        * b3/B3Value.h:
        * b3/B3Variable.cpp: Added.
        (JSC::B3::Variable::~Variable):
        (JSC::B3::Variable::dump):
        (JSC::B3::Variable::deepDump):
        (JSC::B3::Variable::Variable):
        * b3/B3Variable.h: Added.
        (JSC::B3::Variable::type):
        (JSC::B3::Variable::index):
        (JSC::B3::DeepVariableDump::DeepVariableDump):
        (JSC::B3::DeepVariableDump::dump):
        (JSC::B3::deepDump):
        * b3/B3VariableValue.cpp: Added.
        (JSC::B3::VariableValue::~VariableValue):
        (JSC::B3::VariableValue::dumpMeta):
        (JSC::B3::VariableValue::cloneImpl):
        (JSC::B3::VariableValue::VariableValue):
        * b3/B3VariableValue.h: Added.
        * b3/air/AirAllocateStack.cpp:
        (JSC::B3::Air::allocateStack):
        * b3/air/AirCode.cpp:
        (JSC::B3::Air::Code::addStackSlot):
        (JSC::B3::Air::Code::addSpecial):
        (JSC::B3::Air::Code::cCallSpecial):
        * b3/air/AirCode.h:
        (JSC::B3::Air::Code::begin):
        (JSC::B3::Air::Code::end):
        (JSC::B3::Air::Code::stackSlots):
        (JSC::B3::Air::Code::specials):
        (JSC::B3::Air::Code::forAllTmps):
        (JSC::B3::Air::Code::StackSlotsCollection::StackSlotsCollection): Deleted.
        (JSC::B3::Air::Code::StackSlotsCollection::size): Deleted.
        (JSC::B3::Air::Code::StackSlotsCollection::at): Deleted.
        (JSC::B3::Air::Code::StackSlotsCollection::operator[]): Deleted.
        (JSC::B3::Air::Code::StackSlotsCollection::iterator::iterator): Deleted.
        (JSC::B3::Air::Code::StackSlotsCollection::iterator::operator*): Deleted.
        (JSC::B3::Air::Code::StackSlotsCollection::iterator::operator++): Deleted.
        (JSC::B3::Air::Code::StackSlotsCollection::iterator::operator==): Deleted.
        (JSC::B3::Air::Code::StackSlotsCollection::iterator::operator!=): Deleted.
        (JSC::B3::Air::Code::StackSlotsCollection::begin): Deleted.
        (JSC::B3::Air::Code::StackSlotsCollection::end): Deleted.
        (JSC::B3::Air::Code::SpecialsCollection::SpecialsCollection): Deleted.
        (JSC::B3::Air::Code::SpecialsCollection::size): Deleted.
        (JSC::B3::Air::Code::SpecialsCollection::at): Deleted.
        (JSC::B3::Air::Code::SpecialsCollection::operator[]): Deleted.
        (JSC::B3::Air::Code::SpecialsCollection::iterator::iterator): Deleted.
        (JSC::B3::Air::Code::SpecialsCollection::iterator::operator*): Deleted.
        (JSC::B3::Air::Code::SpecialsCollection::iterator::operator++): Deleted.
        (JSC::B3::Air::Code::SpecialsCollection::iterator::operator==): Deleted.
        (JSC::B3::Air::Code::SpecialsCollection::iterator::operator!=): Deleted.
        (JSC::B3::Air::Code::SpecialsCollection::begin): Deleted.
        (JSC::B3::Air::Code::SpecialsCollection::end): Deleted.
        * b3/air/AirFixObviousSpills.cpp:
        * b3/air/AirInstInlines.h:
        * b3/air/AirIteratedRegisterCoalescing.cpp:
        * b3/air/AirLiveness.h:
        * b3/air/AirLowerAfterRegAlloc.cpp:
        (JSC::B3::Air::lowerAfterRegAlloc):
        * b3/air/AirSpecial.cpp:
        (JSC::B3::Air::Special::Special):
        * b3/air/AirSpecial.h:
        * b3/air/AirSpillEverything.cpp:
        (JSC::B3::Air::spillEverything):
        * b3/air/AirStackSlot.cpp:
        (JSC::B3::Air::StackSlot::dump):
        (JSC::B3::Air::StackSlot::deepDump):
        (JSC::B3::Air::StackSlot::StackSlot):
        * b3/air/AirStackSlot.h:
        (JSC::B3::Air::StackSlot::byteSize):
        (JSC::B3::Air::StackSlot::kind):
        (JSC::B3::Air::StackSlot::isLocked):
        (JSC::B3::Air::StackSlot::isSpill):
        (JSC::B3::Air::StackSlot::index):
        (JSC::B3::Air::StackSlot::ensureSize):
        * b3/air/AirStackSlotKind.cpp: Copied from Source/JavaScriptCore/b3/B3StackSlotKind.cpp.
        (WTF::printInternal):
        * b3/air/AirStackSlotKind.h: Copied from Source/JavaScriptCore/b3/B3StackSlotKind.h.
        * b3/air/opcode_generator.rb:
        * b3/air/testair.cpp:
        (JSC::B3::Air::testShuffleBroadcastAllRegs):
        (JSC::B3::Air::testShuffleShiftAllRegs):
        (JSC::B3::Air::testShuffleRotateAllRegs):
        * b3/testb3.cpp:
        (JSC::B3::testStackSlot):
        (JSC::B3::testStoreLoadStackSlot):
        * ftl/FTLB3Output.cpp:
        (JSC::FTL::Output::lockedStackSlot):
        (JSC::FTL::Output::neg):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileInvalidationPoint):

2016-02-02  Yusuke Suzuki  <utatane.tea@gmail.com>

        [JSC] Introduce BytecodeIntrinsic constant rep like @undefined
        https://bugs.webkit.org/show_bug.cgi?id=153737

        Reviewed by Darin Adler.

        This patch enhances existing BytecodeIntrinsic mechanism to accept `@xxx` form,
        that will be used to represent bytecode intrinsic constants.
        After this change, we can use 2 forms for bytecode intrinsics. (1) Function form (like, @toString(value))
        and (2) Constant form (like @undefined).

        Bytecode intrinsic constants allow us to easily expose constant values from C++ world.
        For example, we can expose ArrayIterationKind flags to JS world without using private global variables.
        Exposed constant values are loaded from bytecodes directly through constant registers.
        While previously we expose them through private global variables, bytecode intrinsic constants
        can be loaded directly from CodeBlock. And later, it will become JSConstant in DFG.

        And by using this mechanism, we implement several constants. @undefined, @arrayIterationKindKeyValue etc.

        * builtins/ArrayConstructor.js:
        (from):
        * builtins/ArrayIteratorPrototype.js:
        (next):
        * builtins/ArrayPrototype.js:
        (reduce):
        (reduceRight):
        (every):
        (forEach):
        (filter):
        (map):
        (some):
        (fill):
        (find):
        (findIndex):
        (includes):
        (sort.compactSparse):
        (sort.compactSlow):
        (sort.compact):
        (sort):
        (copyWithin):
        * builtins/DatePrototype.js:
        (toLocaleString.toDateTimeOptionsAnyAll):
        (toLocaleString):
        (toLocaleDateString.toDateTimeOptionsDateDate):
        (toLocaleDateString):
        (toLocaleTimeString.toDateTimeOptionsTimeTime):
        (toLocaleTimeString):
        * builtins/GeneratorPrototype.js:
        (generatorResume):
        * builtins/GlobalObject.js:
        (isDictionary):
        * builtins/InternalPromiseConstructor.js:
        (internalAll.newResolveElement):
        (internalAll):
        * builtins/IteratorPrototype.js:
        (symbolIteratorGetter):
        (symbolIterator): Deleted.
        * builtins/MapPrototype.js:
        (forEach):
        * builtins/ModuleLoaderObject.js:
        (newRegistryEntry):
        (forceFulfillPromise):
        (commitInstantiated):
        (requestFetch):
        (requestTranslate):
        (requestInstantiate):
        (requestLink):
        (provide):
        * builtins/PromiseConstructor.js:
        (all.newResolveElement):
        (all):
        (race):
        (reject):
        (resolve):
        * builtins/PromiseOperations.js:
        (newPromiseCapability.executor):
        (newPromiseCapability):
        (rejectPromise):
        (fulfillPromise):
        (createResolvingFunctions.resolve):
        (createResolvingFunctions.reject):
        (createResolvingFunctions):
        (promiseReactionJob):
        (promiseResolveThenableJob):
        (initializePromise):
        * builtins/PromisePrototype.js:
        (catch):
        (then):
        * builtins/SetPrototype.js:
        (forEach):
        * builtins/StringConstructor.js:
        (raw):
        * builtins/StringIteratorPrototype.js:
        (next):
        * builtins/StringPrototype.js:
        (localeCompare):
        * builtins/TypedArrayConstructor.js:
        (of):
        (from):
        * builtins/TypedArrayPrototype.js:
        (every):
        (find):
        (findIndex):
        (forEach):
        (some):
        (reduce):
        (reduceRight):
        (map):
        (filter):
        * bytecode/BytecodeIntrinsicRegistry.cpp:
        (JSC::BytecodeIntrinsicRegistry::BytecodeIntrinsicRegistry):
        (JSC::BytecodeIntrinsicRegistry::lookup):
        * bytecode/BytecodeIntrinsicRegistry.h:
        * bytecompiler/NodesCodegen.cpp:
        * parser/ASTBuilder.h:
        (JSC::ASTBuilder::createResolve):
        (JSC::ASTBuilder::makeFunctionCallNode):
        * parser/NodeConstructors.h:
        (JSC::BytecodeIntrinsicNode::BytecodeIntrinsicNode):
        * parser/Nodes.h:
        (JSC::ExpressionNode::isBytecodeIntrinsicNode):
        (JSC::BytecodeIntrinsicNode::type):
        (JSC::BytecodeIntrinsicNode::emitter):
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseProperty):
        (JSC::Parser<LexerType>::parsePrimaryExpression):
        * parser/SyntaxChecker.h:
        (JSC::SyntaxChecker::createResolve):
        * runtime/CommonIdentifiers.cpp:
        (JSC::CommonIdentifiers::CommonIdentifiers): Deleted.
        * runtime/CommonIdentifiers.h:
        (JSC::CommonIdentifiers::bytecodeIntrinsicRegistry): Deleted.
        * runtime/IteratorPrototype.cpp:
        (JSC::IteratorPrototype::finishCreation):
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init): Deleted.
        * runtime/VM.cpp:
        (JSC::VM::VM):
        * runtime/VM.h:
        (JSC::VM::bytecodeIntrinsicRegistry):

2016-02-02  Per Arne Vollan  <peavo@outlook.com>

        [B3][Win64] Compile fixes.
        https://bugs.webkit.org/show_bug.cgi?id=153605

        Reviewed by Filip Pizlo.

        Fix remaining compile errors on Win64.

        * CMakeLists.txt:
        * b3/B3CFG.h:
        (JSC::B3::CFG::newMap):
        * ftl/FTLJITCode.h:

2016-02-01  Chris Dumez  <cdumez@apple.com>

        object.__lookupGetter__() / object.__lookupSetter__() does not work for native bindings
        https://bugs.webkit.org/show_bug.cgi?id=153765
        <rdar://problem/24439699>

        Reviewed by Oliver Hunt.

        Add support for CustomAccessor slots to objectProtoFuncLookupGetter() and
        objectProtoFuncLookupSetter() by return getOwnPropertyDescriptor().get / set.
        getOwnPropertyDescriptor() now correctly deals with CustomAccessors since
        r196001.

        * runtime/ObjectPrototype.cpp:
        (JSC::objectProtoFuncLookupGetter):
        (JSC::objectProtoFuncLookupSetter):

2016-02-01  Chris Dumez  <cdumez@apple.com>

        Native Bindings Descriptors are Incomplete
        https://bugs.webkit.org/show_bug.cgi?id=140575
        <rdar://problem/19506502>

        Reviewed by Oliver Hunt.

        This patch is based on initial work by Joe Pecoraro and Matthew Mirman.

        This patch was initially rolled out for breaking chromeexperiments.com,
        presumably because our IDL attributes were not marked as [configurable]
        at the time. However, since r190104, our IDL attributes are now
        configurable. Based on local testing, chromeexperiments.com seems to be
        working fine now.

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * inspector/InjectedScriptSource.js:
        (endsWith):
        (InjectedScript.prototype.processProperties):
        * runtime/JSBoundSlotBaseFunction.cpp: Added.
        (JSC::boundSlotBaseFunctionCall):
        (JSC::JSBoundSlotBaseFunction::JSBoundSlotBaseFunction):
        (JSC::JSBoundSlotBaseFunction::create):
        (JSC::JSBoundSlotBaseFunction::visitChildren):
        (JSC::JSBoundSlotBaseFunction::finishCreation):
        * runtime/JSBoundSlotBaseFunction.h: Added.
        (JSC::JSBoundSlotBaseFunction::createStructure):
        (JSC::JSBoundSlotBaseFunction::boundSlotBase):
        (JSC::JSBoundSlotBaseFunction::customGetterSetter):
        (JSC::JSBoundSlotBaseFunction::isSetter):
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        (JSC::JSGlobalObject::visitChildren):
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::boundSlotBaseFunctionStructure):
        * runtime/JSObject.cpp:
        (JSC::getBoundSlotBaseFunctionForGetterSetter):
        (JSC::JSObject::getOwnPropertyDescriptor):
        * runtime/VM.cpp:
        (JSC::VM::VM):
        * runtime/VM.h:

2016-02-01  Joseph Pecoraro  <pecoraro@apple.com>

        Web Inspector: High Level Memory Overview Instrument
        https://bugs.webkit.org/show_bug.cgi?id=153516
        <rdar://problem/24356378>

        Reviewed by Brian Burg.

        * CMakeLists.txt:
        * Configurations/FeatureDefines.xcconfig:
        * DerivedSources.make:
        * inspector/protocol/Memory.json: Added.
        * inspector/scripts/codegen/generator.py:
        New Memory domain guarded by ENABLE(RESOURCE_USAGE).
        This feature flag was already used in WebCore.

2016-02-01  Benjamin Poulain  <benjamin@webkit.org>

        [JSC] IRC can coalesce the frame pointer with a Tmp that is modified
        https://bugs.webkit.org/show_bug.cgi?id=153694

        Reviewed by Filip Pizlo.

        Let's say we have:
            Move(FP, Tmp1)
            Add64(#1, Tmp1)

        If we were to coalesce the Move, we would modify the frame pointer.
        Well, that's exactly what was happening with IRC.

        Since the epilogue is not know to Air before IRC, the liveness analysis
        never discovers that FP is live when Tmp1 is UseDef by Add64. Adding
        FP would a be a problem anyway for a bunch of reasons.

        I tried two ways to prevent IRC to override IRC:
        1) Add an interference edge with FP for all non-duplication Defs.
        2) Let coalesce() know about FP and constraint any coalescing with a re-Def.

        The two are within margin of error for performance. The second one was considerably
        more complicated. This patch implements the first one.

        Some extra note:
        -It is very important to not increment the degree of a Tmp when making it interfere
         with FP. FP is not a valid color, it is not counted in the "K" colors considered
         for coloring. Increasing the degree with the edge to FP would make every stage
         pessimistic since there is an extra degree that can never be removed.
        -I put "interferenceEdges" and "adjacencyList" in an inconsistent state.
         This is intentional, "interferenceEdges" is used to test the existence of an edge,
         "adjacencyList" is used to go over all the edges. In this case, we don't want
         the edge with FP to be considered when pruning the graph.

        * b3/air/AirIteratedRegisterCoalescing.cpp:
        One branch could be transformed into an assertion: TmpLiveness is type specific now.
        * b3/testb3.cpp:
        (JSC::B3::testOverrideFramePointer):
        (JSC::B3::run):

2016-02-01  Csaba Osztrogonác  <ossy@webkit.org>

        Unreviewed speculative buildfix.

        * dfg/DFGCommon.h: FTL_USES_B3 should be false if FTL JIT is disabled.

2016-01-31  Dan Bernstein  <mitz@apple.com>

        [Cocoa] Remove unused definition of HAVE_HEADER_DETECTION_H
        https://bugs.webkit.org/show_bug.cgi?id=153729

        Reviewed by Sam Weinig.

        After r141700, HAVE_HEADER_DETECTION_H is no longer used.

        * Configurations/Base.xcconfig:

2016-01-30  Filip Pizlo  <fpizlo@apple.com>

        B3->Air lowering should use MoveFloat more
        https://bugs.webkit.org/show_bug.cgi?id=153714

        Reviewed by Sam Weinig.

        This is a very minor and benign bug. It just means that we will use the more canonical
        MoveFloat instruction when moving floats, rather than using MoveDouble.

        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::relaxedMoveForType):

2016-01-31  Yusuke Suzuki  <utatane.tea@gmail.com>

        Should not predict OtherObj for ToThis with primitive types under strict mode
        https://bugs.webkit.org/show_bug.cgi?id=153544

        Reviewed by Filip Pizlo.

        Currently, ToThis predicates OtherObj for primitive values.
        But it's not true in strict mode.
        In strict mode, ToThis does nothing on primitive values.

        In this patch, we

        1. fix prediction. Handles primitive types in strict mode. And we also handles StringObject.
        2. convert it to Identity if the argument should be predicted as primitive types.

        This optimization is important to implement Primitive.prototype.methods[1].
        Otherwise, we always got BadType OSR exits.

        [1]: https://bugs.webkit.org/show_bug.cgi?id=143889

        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGConstantFoldingPhase.cpp:
        (JSC::DFG::ConstantFoldingPhase::foldConstants):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        (JSC::DFG::FixupPhase::fixupToThis):
        * dfg/DFGPredictionPropagationPhase.cpp:
        (JSC::DFG::PredictionPropagationPhase::propagate):
        * tests/stress/to-this-boolean.js: Added.
        (Boolean.prototype.negate):
        (Boolean.prototype.negate2):
        * tests/stress/to-this-double.js: Added.
        (Number.prototype.negate):
        * tests/stress/to-this-int32.js: Added.
        (Number.prototype.negate):
        * tests/stress/to-this-int52.js: Added.
        (Number.prototype.negate):
        * tests/stress/to-this-number.js: Added.
        (Number.prototype.negate):
        * tests/stress/to-this-string.js: Added.
        (String.prototype.prefix):
        (String.prototype.first):
        (String.prototype.second):
        * tests/stress/to-this-symbol.js: Added.
        (Symbol.prototype.identity):
        (Symbol.prototype.identity2):

2016-01-31  Guillaume Emont  <guijemont@igalia.com>

        [mips] don't save to a callee saved register too early
        https://bugs.webkit.org/show_bug.cgi?id=153463

        If we save $gp to $s4 in pichdr, then in some cases, we were
        overwriting $s4 before LLInt's pushCalleeSaves() is called (as pichdr
        is at the very beginning of a function). Now we save $gp to $s4 at the
        end of pushCalleeSaves().

        Reviewed by Michael Saboff.

        * offlineasm/mips.rb:
        * llint/LowLevelInterpreter.asm:
        Move the saving of $gp to $s4 from pichdr to pushCalleeSaves(). Take
        the opportunity to only save $s4 as we never use the other callee
        saved registers.

2016-01-30  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r195799 and r195828.
        https://bugs.webkit.org/show_bug.cgi?id=153722

        Caused assertion failures, severely affecting EWS (Requested
        by ap on #webkit).

        Reverted changesets:

        "Web Inspector: InspectorTimelineAgent doesn't need to
        recompile functions because it now uses the sampling profiler"
        https://bugs.webkit.org/show_bug.cgi?id=153500
        http://trac.webkit.org/changeset/195799

        "Attempt to fix the Windows build after r195799"
        http://trac.webkit.org/changeset/195828

2016-01-30  Yusuke Suzuki  <utatane.tea@gmail.com>

        [B3] JetStream/quicksort.c fails/hangs on Linux with GCC
        https://bugs.webkit.org/show_bug.cgi?id=153647

        Reviewed by Filip Pizlo.

        In B3ComputeDivisionMagic, we accidentally perform sub, add operation onto signed integer. (In this case, int32_t)
        But integer overflow is undefined behavior in C![1][2]
        As a result, in GCC 4.9 release build, computeDivisionMagic(2) returns unexpected value.
        `divisor = 2`
        `d = 2`
        `signedMin = INT32_MIN = -2147483647 (-0x7fffffff)`
        `t = signedMin`
        `anc = t - 1 - (t % ad)` Oops, we performed overflow operation!

        So, `anc` value becomes undefined.
        In this patch, we first cast all the operated values to unsigned one.
        Reading the code, there are no operations that depends on signedness. (For example, we used aboveEqual like unsigned operations for comparison.)

        [1]: http://blog.llvm.org/2011/05/what-every-c-programmer-should-know.html
        [2]: http://dl.acm.org/citation.cfm?id=2522728

        * b3/B3ComputeDivisionMagic.h:
        (JSC::B3::computeDivisionMagic):
        * b3/testb3.cpp:
        (JSC::B3::testComputeDivisionMagic):
        (JSC::B3::run):

2016-01-30  Andreas Kling  <akling@apple.com>

        Shrink Heap::m_executables after cleaning it.
        <https://webkit.org/b/153682>

        Reviewed by Darin Adler.

        The Heap::m_executables Vector was never shrunk down, despite sometimes
        getting pretty huge (~500kB in my longest-running WebContent process.)

        After GC has finished pruning unmarked Executables, shrink the Vector.

        * heap/Heap.cpp:
        (JSC::Heap::clearUnmarkedExecutables):

2016-01-29  Ada Chan  <adachan@apple.com>

        Enable VIDEO_PRESENTATION_MODE only in Debug and Release builds on Mac
        https://bugs.webkit.org/show_bug.cgi?id=153665

        Reviewed by Dan Bernstein.

        * Configurations/FeatureDefines.xcconfig:

2016-01-30  Yusuke Suzuki  <utatane.tea@gmail.com>

        [B3] REGRESSION(r195882): Should break early after modConstant replaceWithNewValue succeeds
        https://bugs.webkit.org/show_bug.cgi?id=153711

        Reviewed by Filip Pizlo.

        Should break after modConstant replaceWithNewValue succeeds. m_value is already replaced with Identity
        if modConstant succeeds. So it does not have any children. m_value->child(1) breaks testb3.

        * b3/B3ReduceStrength.cpp:

2016-01-30  Yusuke Suzuki  <utatane.tea@gmail.com>

        Enable SamplingProfiler on POSIX environment
        https://bugs.webkit.org/show_bug.cgi?id=153584

        Reviewed by Michael Saboff.

        In this patch, we implement suspend and resume mechanizm for POSIX threads.
        And with GLIBC, we can retrieve registers from it.

        We take the following strategy.

        Suspend side.
        1. install sigaction to the threads.
        2. in the profiler (suspend / resume callers), emit signal with pthread_kill and wait with POSIX semaphore.
        3. in the signal handler, up the POSIX semaphore. Use sem_post because it is the async-signal-safe function in POSIX.
        4. in the signal handler, perform sigsuspend to stop the thread until being resumed.
        5. in the profiler, we can be waken up from the semaphore because (3) ups.

        Resume side.
        1. in the profiler, emit signal and wait on the semaphore.
        2. in the signal handler, it is waken up from the sigsuspend.
        3. in the signal handler, up the semaphore.
        4. in the profiler, the profiler is waken up from the semaphore. It is ensured that the given thread is resumed by the signal.

        * heap/MachineStackMarker.cpp:
        (pthreadSignalHandlerSuspendResume):
        (JSC::MachineThreads::Thread::Thread):
        (JSC::MachineThreads::Thread::~Thread):
        (JSC::MachineThreads::Thread::suspend):
        (JSC::MachineThreads::Thread::resume):
        (JSC::MachineThreads::Thread::getRegisters):
        (JSC::MachineThreads::Thread::Registers::stackPointer):
        (JSC::MachineThreads::Thread::Registers::framePointer):
        (JSC::MachineThreads::Thread::Registers::instructionPointer):
        (JSC::MachineThreads::Thread::Registers::llintPC):
        (JSC::MachineThreads::Thread::freeRegisters):
        * heap/MachineStackMarker.h:
        * runtime/SamplingProfiler.cpp:
        (JSC::reportStats):
        * tests/stress/call-varargs-from-inlined-code-with-odd-number-of-arguments.js:
        * tests/stress/call-varargs-from-inlined-code.js:
        * tests/stress/v8-earley-boyer-strict.js:

2016-01-29  Filip Pizlo  <fpizlo@apple.com>

        B3 should reduce Mod(value, constant) to Div and Mul so that our Div optimizations can do things
        https://bugs.webkit.org/show_bug.cgi?id=153693

        Reviewed by Saam Barati.

        The most efficient way to handle Mod(value, constant) is to reduce it to
        Sub(value, Mul(Div(value, constant), constant)) and then let the Div optimizations do their
        thing.

        In the future we could add special handling of Mod(value, 1 << constant), but it's not
        obvious that this would produce better code than reducing through Div, if we also make sure
        that we have great optimizations for Mul and Div.

        * b3/B3ReduceStrength.cpp:

2016-01-29  Keith Miller  <keith_miller@apple.com>

        Array.prototype native functions should use Symbol.species to construct the result
        https://bugs.webkit.org/show_bug.cgi?id=153660

        Reviewed by Saam Barati.

        This patch adds support for Symbol.species in the Array.prototype native functions.
        We make an optimization to avoid regressions on some benchmarks by using an
        adaptive watchpoint to check if Array.prototype.constructor is ever changed.

        * runtime/ArrayPrototype.cpp:
        (JSC::putLength):
        (JSC::setLength):
        (JSC::speciesConstructArray):
        (JSC::arrayProtoFuncConcat):
        (JSC::arrayProtoFuncSlice):
        (JSC::arrayProtoFuncSplice):
        (JSC::ArrayPrototype::setConstructor):
        (JSC::ArrayPrototypeAdaptiveInferredPropertyWatchpoint::ArrayPrototypeAdaptiveInferredPropertyWatchpoint):
        (JSC::ArrayPrototypeAdaptiveInferredPropertyWatchpoint::handleFire):
        * runtime/ArrayPrototype.h:
        (JSC::ArrayPrototype::didChangeConstructorProperty):
        * runtime/ConstructData.cpp:
        (JSC::construct):
        * runtime/ConstructData.h:
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        * tests/es6.yaml:
        * tests/stress/array-species-functions.js: Added.
        (Symbol.species):
        (funcThrows):
        (test.species):
        (test):

2016-01-29  Filip Pizlo  <fpizlo@apple.com>

        CallLinkStatus should trust BadCell exit sites whenever there is no stub
        https://bugs.webkit.org/show_bug.cgi?id=153691

        Reviewed by Benjamin Poulain.

        This fixes a regression in our treatment of inlining failure exit sites when deciding if we
        should inline a call.

        A long time ago, a BadCell exit site would ensure that a CallLinkStatus returned
        takesSlowPath.

        But then we added closure calls. A BadCell exit site might just mean that we should do
        closure call inlining. We added a BadExecutable exit site to indicate that even closure call
        inlining had failed. BadCell would no longer force CallLinkStatus to return takesSlowPath,
        but BadExecutable would stuff do so.

        But then we unified the IR for checking functions and executables, and the DFG stopped using
        the BadExecutable exit kind. Probably this change disabled our ability to use exit site
        counting for deciding when to takesSlowPath. But this isn't necessarily a disaster, since
        any time you exited in this way, you'd be taken to a baseline call inline cache, and that
        inline cache would record the slow path.

        But then we introduced polymorphic call inlining. Polymorphic call inlining means that call
        unlinking, like when one of the callees is optimized, will reset the stub. We also made it
        so that the stub is like a gate for the slow path count. A clear inline cache must first
        cause the creation of a stub and then cause it to overflow before the slow path is counted.

        So, if the DFG or FTL exits on a cell check associated with a particular callsite being
        speculatively inlined, then it's possible that nobody will know about the exit because:

        - The exit kind is BadCell but CallLinkStatus needs BadExecutable to disable inlining.

        - Between when we tiered up to the DFG (or FTL) and when the exit happened, one of the
          callees was tiered up, causing the baseline CallLinkInfo to be unlinked. Therefore, after
          the exit, the inline cache is in a reset state and will not count the call as taking slow
          path.

        The challenge when dealing with this is that often, we will have an super early compilation
        of a minimorphic call site before we have seen all of its small set of callees. For example
        we may have seen only one of two possible callees. That early compilation will OSR exit, and
        in trunk, will be recompiled with bimorphic speculative inlining. That's a pretty good
        outcome. Basically, we are trusting that if during the time that the function has been
        running prior to a given compilation, a callsite has only seen a small number of callees,
        then it's safe to assume that it won't see another one anytime soon.

        So, simply forcing the CallLinkStatus to set takesSlowPath any time there was a BadCell exit
        would hurt our performance in some cases, because trunk prior to this change would have their
        final compilation use speculative inlining, and this change would make guarded inlining
        instead.

        The compromise that I came up with relies on the fact that a CallLinkInfo must be reset quite
        frequently for it to routinely happen in between tier-up to DFG (or FTL) and an exit. So,
        most likely, such a CallLinkInfo will also show up as being clear when the CallLinkStatus
        is built during DFG profiling. The CallLinkStatus will then fall back on the CallLinkInfo's
        lastSeenCallee field, which is persistent across resets. This change just makes it so that
        CallLinkStatus sets takesSlowPath if there is a BadCell exit and the status had to be
        inferred from the lastSeenCallee.

        This change reduces pointless recompilations in gbemu. It's an 11% speed-up on gbemu. It
        doesn't seem to hurt any benchmarks.

        * bytecode/CallLinkStatus.cpp:
        (JSC::CallLinkStatus::computeFor):
        (JSC::CallLinkStatus::computeExitSiteData):
        (JSC::CallLinkStatus::computeFromCallLinkInfo):
        * bytecode/CallLinkStatus.h:
        (JSC::CallLinkStatus::CallLinkStatus):
        (JSC::CallLinkStatus::at):
        (JSC::CallLinkStatus::operator[]):
        (JSC::CallLinkStatus::isProved):
        (JSC::CallLinkStatus::isBasedOnStub):
        (JSC::CallLinkStatus::canOptimize):
        (JSC::CallLinkStatus::maxNumArguments):
        (JSC::CallLinkStatus::ExitSiteData::ExitSiteData): Deleted.

2016-01-29  Saam barati  <sbarati@apple.com>

        Pack FunctionExecutable and UnlinkedFunctionExecutable harder
        https://bugs.webkit.org/show_bug.cgi?id=153687

        Reviewed by Andreas Kling.

        This patch reduces FunctionExecutable from 120 to 104 bytes.
        This patch reduces UnlinkedFunctionExecutable from 144 to 136 bytes.

        * bytecode/ExecutableInfo.h:
        * bytecode/UnlinkedFunctionExecutable.cpp:
        (JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
        * bytecode/UnlinkedFunctionExecutable.h:
        * parser/ParserModes.h:
        (JSC::functionNameScopeIsDynamic):
        * runtime/Executable.cpp:
        (JSC::ScriptExecutable::ScriptExecutable):
        * runtime/Executable.h:
        (JSC::ScriptExecutable::needsActivation):
        (JSC::ScriptExecutable::isArrowFunctionContext):
        (JSC::ScriptExecutable::isStrictMode):
        (JSC::ScriptExecutable::derivedContextType):
        (JSC::ScriptExecutable::ecmaMode):
        (JSC::ScriptExecutable::finishCreation):

2016-01-29  Saam barati  <sbarati@apple.com>

        JSC Sampling Profiler: Come up with a (program counter => CodeOrigin) mapping
        https://bugs.webkit.org/show_bug.cgi?id=152629

        Reviewed by Filip Pizlo.

        This patch implements a mapping from PC to CodeOrigin
        that lives off of JITed CodeBlocks. We build this mapping
        while JITing code, and then we compress it and store
        it on the CodeBlock. We only build the mapping if a debugger
        has ever been attached to any global object.

        CodeBlock consults this mapping when searching for a CodeOrigin
        for a given PC, but it also consults other code ranges
        off the main path that may own the PC. Specifically, it searches
        through inline caches, OSRExits, and LazySlowPaths.

        To find PC info for the LLInt, we also save the LLInt pc when
        taking a stack trace where the top frame is in LLInt code.

        This patch also cleans up code inside the SamplingProfier.
        I realized a bug in the SamplingProfiler's implementation.
        We used to walk the inline stack while gathering a stack
        trace. This is wrong. It's super dangerous to do this because
        we might pause the JSC process while it's modifying its
        CodeOrigin table. We used to walk the inline stack while
        taking a stack trace because doing so could save us from
        having to verify a particular stack trace. This patch changes that.
        We now have to verify all stack traces taken. This verification step
        includes walking the inline stack.

        Because we have a PC=>CodeOrigin map, we can now gather more
        detailed information about the top-frame we pause. This allows
        us to correctly observe inlining. It also allows us to observe
        expression-level line/column information for the top frame.
        The reason we don't consult this mapping for parent frames is 
        that all parent frames should set the CallSiteIndex on the call
        frame header, which means we can consult that value to get inlining 
        and expression-level line/column information.

        * CMakeLists.txt:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * assembler/AbstractMacroAssembler.h:
        (JSC::AbstractMacroAssembler::Label::Label):
        (JSC::AbstractMacroAssembler::Label::operator==):
        (JSC::AbstractMacroAssembler::Label::isSet):
        * assembler/AssemblerBuffer.h:
        (JSC::AssemblerLabel::labelAtOffset):
        (JSC::AssemblerLabel::operator==):
        * b3/B3Generate.cpp:
        * b3/B3Origin.h:
        (JSC::B3::Origin::data):
        (JSC::B3::Origin::operator==):
        * b3/B3PCToOriginMap.h: Added.
        (JSC::B3::PCToOriginMap::PCToOriginMap):
        (JSC::B3::PCToOriginMap::appendItem):
        (JSC::B3::PCToOriginMap::ranges):
        * b3/B3Procedure.h:
        (JSC::B3::Procedure::pcToOriginMap):
        (JSC::B3::Procedure::releasePCToOriginMap):
        * b3/air/AirGenerate.cpp:
        (JSC::B3::Air::generate):
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::insertBasicBlockBoundariesForControlFlowProfiler):
        (JSC::CodeBlock::setPCToCodeOriginMap):
        (JSC::CodeBlock::findPC):
        * bytecode/CodeBlock.h:
        (JSC::CodeBlock::jitCodeMap):
        (JSC::CodeBlock::bytecodeOffset):
        * bytecode/CodeOrigin.h:
        (JSC::CodeOrigin::operator==):
        (JSC::CodeOriginHash::hash):
        (JSC::CodeOriginHash::equal):
        * bytecode/InlineCallFrame.h:
        (JSC::baselineCodeBlockForOriginAndBaselineCodeBlock):
        (JSC::CodeOrigin::walkUpInlineStack):
        * bytecode/PolymorphicAccess.h:
        (JSC::PolymorphicAccess::containsPC):
        * bytecode/StructureStubInfo.cpp:
        (JSC::StructureStubInfo::visitWeakReferences):
        (JSC::StructureStubInfo::containsPC):
        * bytecode/StructureStubInfo.h:
        * bytecode/UnlinkedCodeBlock.h:
        (JSC::UnlinkedCodeBlock::hasExpressionInfo):
        (JSC::UnlinkedCodeBlock::expressionInfo):
        (JSC::UnlinkedCodeBlock::setThisRegister):
        * debugger/Debugger.cpp:
        (JSC::Debugger::attach):
        * dfg/DFGJITCode.cpp:
        (JSC::DFG::JITCode::validateReferences):
        (JSC::DFG::JITCode::findPC):
        * dfg/DFGJITCode.h:
        (JSC::DFG::JITCode::commonDataOffset):
        * dfg/DFGJITCompiler.cpp:
        (JSC::DFG::JITCompiler::JITCompiler):
        (JSC::DFG::JITCompiler::link):
        (JSC::DFG::JITCompiler::compile):
        (JSC::DFG::JITCompiler::compileFunction):
        (JSC::DFG::JITCompiler::recordCallSiteAndGenerateExceptionHandlingOSRExitIfNeeded):
        (JSC::DFG::JITCompiler::setEndOfMainPath):
        (JSC::DFG::JITCompiler::setEndOfCode):
        * dfg/DFGJITCompiler.h:
        (JSC::DFG::JITCompiler::setStartOfCode):
        (JSC::DFG::JITCompiler::setForNode):
        (JSC::DFG::JITCompiler::addCallSite):
        (JSC::DFG::JITCompiler::pcToCodeOriginMapBuilder):
        (JSC::DFG::JITCompiler::setEndOfMainPath): Deleted.
        (JSC::DFG::JITCompiler::setEndOfCode): Deleted.
        * dfg/DFGSlowPathGenerator.h:
        (JSC::DFG::SlowPathGenerator::call):
        (JSC::DFG::SlowPathGenerator::origin):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::addSlowPathGenerator):
        (JSC::DFG::SpeculativeJIT::runSlowPathGenerators):
        (JSC::DFG::SpeculativeJIT::compileCurrentBlock):
        * dfg/DFGSpeculativeJIT.h:
        * ftl/FTLB3Compile.cpp:
        (JSC::FTL::compile):
        * ftl/FTLJITCode.cpp:
        (JSC::FTL::JITCode::liveRegistersToPreserveAtExceptionHandlingCallSite):
        (JSC::FTL::JITCode::findPC):
        * ftl/FTLJITCode.h:
        (JSC::FTL::JITCode::b3Code):
        * heap/MachineStackMarker.cpp:
        (JSC::MachineThreads::Thread::Registers::instructionPointer):
        (JSC::MachineThreads::Thread::Registers::llintPC):
        (JSC::MachineThreads::Thread::freeRegisters):
        * heap/MachineStackMarker.h:
        * inspector/agents/InspectorScriptProfilerAgent.cpp:
        (Inspector::InspectorScriptProfilerAgent::addEvent):
        (Inspector::buildSamples):
        (Inspector::InspectorScriptProfilerAgent::trackingComplete):
        * jit/JIT.cpp:
        (JSC::JIT::JIT):
        (JSC::JIT::privateCompileMainPass):
        (JSC::JIT::privateCompileSlowCases):
        (JSC::JIT::privateCompile):
        * jit/JIT.h:
        * jit/JITCode.h:
        (JSC::JITCode::findPC):
        * jit/PCToCodeOriginMap.cpp: Added.
        (JSC::PCToCodeOriginMapBuilder::PCToCodeOriginMapBuilder):
        (JSC::PCToCodeOriginMapBuilder::appendItem):
        (JSC::PCToCodeOriginMap::PCToCodeOriginMap):
        (JSC::PCToCodeOriginMap::~PCToCodeOriginMap):
        (JSC::PCToCodeOriginMap::memorySize):
        (JSC::PCToCodeOriginMap::findPC):
        * jit/PCToCodeOriginMap.h: Added.
        (JSC::PCToCodeOriginMapBuilder::defaultCodeOrigin):
        (JSC::PCToCodeOriginMapBuilder::didBuildMapping):
        * jsc.cpp:
        (functionSamplingProfilerStackTraces):
        * llint/LLIntPCRanges.h:
        (JSC::LLInt::isLLIntPC):
        * llint/LowLevelInterpreter.asm:
        * runtime/Options.h:
        * runtime/SamplingProfiler.cpp:
        (JSC::reportStats):
        (JSC::FrameWalker::FrameWalker):
        (JSC::FrameWalker::walk):
        (JSC::FrameWalker::resetAtMachineFrame):
        (JSC::FrameWalker::isValidFramePointer):
        (JSC::SamplingProfiler::SamplingProfiler):
        (JSC::SamplingProfiler::~SamplingProfiler):
        (JSC::tryGetBytecodeIndex):
        (JSC::SamplingProfiler::processUnverifiedStackTraces):
        (JSC::SamplingProfiler::visit):
        (JSC::SamplingProfiler::noticeVMEntry):
        (JSC::SamplingProfiler::clearData):
        (JSC::SamplingProfiler::StackFrame::displayName):
        (JSC::SamplingProfiler::StackFrame::displayNameForJSONTests):
        (JSC::SamplingProfiler::StackFrame::functionStartLine):
        (JSC::SamplingProfiler::StackFrame::functionStartColumn):
        (JSC::SamplingProfiler::StackFrame::sourceID):
        (JSC::SamplingProfiler::StackFrame::url):
        (JSC::SamplingProfiler::releaseStackTraces):
        (JSC::SamplingProfiler::stackTracesAsJSON):
        (WTF::printInternal):
        (JSC::SamplingProfiler::StackFrame::startLine): Deleted.
        (JSC::SamplingProfiler::StackFrame::startColumn): Deleted.
        (JSC::SamplingProfiler::stackTraces): Deleted.
        * runtime/SamplingProfiler.h:
        (JSC::SamplingProfiler::UnprocessedStackFrame::UnprocessedStackFrame):
        (JSC::SamplingProfiler::StackFrame::StackFrame):
        (JSC::SamplingProfiler::StackTrace::StackTrace):
        (JSC::SamplingProfiler::totalTime):
        (JSC::SamplingProfiler::setStopWatch):
        * runtime/VM.cpp:
        (JSC::VM::VM):
        * runtime/VM.h:
        (JSC::VM::setShouldBuildPCToCodeOriginMapping):
        (JSC::VM::shouldBuilderPCToCodeOriginMapping):
        * tests/stress/sampling-profiler-basic.js:
        (platformSupportsSamplingProfiler.top):
        (platformSupportsSamplingProfiler.jaz):
        (platformSupportsSamplingProfiler.kaz):

2016-01-29  Saam barati  <sbarati@apple.com>

        Remove our notion of having a single activation register
        https://bugs.webkit.org/show_bug.cgi?id=153673

        Reviewed by Filip Pizlo.

        We have many functions lurking around where we think a function 
        might only have one activation register. This is clearly wrong
        now that ES6 has block scoping. This patch removes this false notion.

        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::dumpBytecode):
        (JSC::CodeBlock::CodeBlock):
        * bytecode/CodeBlock.h:
        (JSC::CodeBlock::scopeRegister):
        (JSC::CodeBlock::codeType):
        (JSC::CodeBlock::setActivationRegister): Deleted.
        (JSC::CodeBlock::activationRegister): Deleted.
        (JSC::CodeBlock::uncheckedActivationRegister): Deleted.
        (JSC::CodeBlock::needsActivation): Deleted.
        * bytecode/ExecutableInfo.h:
        (JSC::ExecutableInfo::ExecutableInfo):
        (JSC::ExecutableInfo::usesEval):
        (JSC::ExecutableInfo::isStrictMode):
        (JSC::ExecutableInfo::isConstructor):
        (JSC::ExecutableInfo::isClassContext):
        (JSC::ExecutableInfo::needsActivation): Deleted.
        * bytecode/UnlinkedCodeBlock.cpp:
        (JSC::UnlinkedCodeBlock::UnlinkedCodeBlock):
        * bytecode/UnlinkedCodeBlock.h:
        (JSC::UnlinkedCodeBlock::isArrowFunctionContext):
        (JSC::UnlinkedCodeBlock::isClassContext):
        (JSC::UnlinkedCodeBlock::setThisRegister):
        (JSC::UnlinkedCodeBlock::setScopeRegister):
        (JSC::UnlinkedCodeBlock::usesGlobalObject):
        (JSC::UnlinkedCodeBlock::setGlobalObjectRegister):
        (JSC::UnlinkedCodeBlock::thisRegister):
        (JSC::UnlinkedCodeBlock::scopeRegister):
        (JSC::UnlinkedCodeBlock::addPropertyAccessInstruction):
        (JSC::UnlinkedCodeBlock::needsFullScopeChain): Deleted.
        (JSC::UnlinkedCodeBlock::setActivationRegister): Deleted.
        (JSC::UnlinkedCodeBlock::activationRegister): Deleted.
        (JSC::UnlinkedCodeBlock::hasActivationRegister): Deleted.
        * bytecode/UnlinkedFunctionExecutable.cpp:
        (JSC::generateUnlinkedFunctionCodeBlock):
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::BytecodeGenerator):
        (JSC::BytecodeGenerator::initializeVarLexicalEnvironment):
        * bytecompiler/BytecodeGenerator.h:
        (JSC::BytecodeGenerator::destinationForAssignResult):
        (JSC::BytecodeGenerator::leftHandSideNeedsCopy):
        (JSC::BytecodeGenerator::emitNodeForLeftHandSide):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::inliningCost):
        (JSC::DFG::ByteCodeParser::parseCodeBlock):
        * dfg/DFGGraph.h:
        (JSC::DFG::Graph::hasExitSite):
        (JSC::DFG::Graph::activationRegister): Deleted.
        (JSC::DFG::Graph::uncheckedActivationRegister): Deleted.
        (JSC::DFG::Graph::machineActivationRegister): Deleted.
        (JSC::DFG::Graph::uncheckedMachineActivationRegister): Deleted.
        * dfg/DFGStackLayoutPhase.cpp:
        (JSC::DFG::StackLayoutPhase::run):
        * interpreter/CallFrame.cpp:
        (JSC::CallFrame::callSiteIndex):
        (JSC::CallFrame::stack):
        (JSC::CallFrame::callerFrame):
        (JSC::CallFrame::friendlyFunctionName):
        (JSC::CallFrame::hasActivation): Deleted.
        (JSC::CallFrame::uncheckedActivation): Deleted.
        (JSC::CallFrame::lexicalEnvironment): Deleted.
        (JSC::CallFrame::lexicalEnvironmentOrNullptr): Deleted.
        (JSC::CallFrame::setActivation): Deleted.
        * interpreter/CallFrame.h:
        (JSC::ExecState::scope):
        (JSC::ExecState::setCallerFrame):
        (JSC::ExecState::setScope):
        (JSC::ExecState::init):
        * interpreter/Register.h:
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
        * runtime/Executable.h:
        (JSC::ScriptExecutable::usesEval):
        (JSC::ScriptExecutable::usesArguments):
        (JSC::ScriptExecutable::isArrowFunctionContext):
        (JSC::ScriptExecutable::isStrictMode):
        (JSC::ScriptExecutable::derivedContextType):
        (JSC::ScriptExecutable::needsActivation): Deleted.
        * runtime/JSLexicalEnvironment.h:
        (JSC::asActivation):
        (JSC::Register::lexicalEnvironment): Deleted.

2016-01-29  Filip Pizlo  <fpizlo@apple.com>

        Air:fixObviousSpills should handle floats and doubles
        https://bugs.webkit.org/show_bug.cgi?id=153197

        Reviewed by Saam Barati.

        This adds the most obvious handling of float spills, where we just enable load elimination on
        float spill code.

        * b3/air/AirFixObviousSpills.cpp:

2016-01-29  Andreas Kling  <akling@apple.com>

        Shrink CodeBlock!
        <https://webkit.org/b/153640>

        Reviewed by Saam Barati.

        Shrink CodeBlock by 112 bytes (from 640 to 528) by employing
        these sophisticated tricks:

            - Remove members that are not used by anyone.
            - Don't cache both VM* and Heap* in members.
            - Reorder members to minimize struct padding.
            - Use RefCountedArray instead of Vector for arrays that never resize.
            - Put a not-always-present HashMap in a std::unique_ptr.

        This increases CodeBlock space efficiency by 20%, as we can now
        fit 30 of them in a MarkedBlock, up from 25.)

        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::CodeBlock):
        (JSC::CodeBlock::finishCreation):
        (JSC::CodeBlock::setNumParameters):
        (JSC::CodeBlock::jettison):
        (JSC::CodeBlock::noticeIncomingCall):
        (JSC::CodeBlock::resultProfileForBytecodeOffset):
        * bytecode/CodeBlock.h:
        (JSC::CodeBlock::setJITCode):
        (JSC::CodeBlock::capabilityLevelState):
        (JSC::CodeBlock::codeType):
        (JSC::CodeBlock::ensureResultProfile):
        (JSC::CodeBlock::heap):

2016-01-29  Saam barati  <sbarati@apple.com>

        Exits from exceptions shouldn't jettison code
        https://bugs.webkit.org/show_bug.cgi?id=153564

        Reviewed by Geoffrey Garen.

        We create two new exit kinds for exception-handling
        OSRExits:
        - ExceptionCheck: an exception check after a C call.
        - GenericUnwind: an OSR exit executes because it's jumped to from genericUnwind machinery.

        Having these two new exit kinds allows us to remove fields from
        various OSRExit variants that store booleans indicating
        if the exit is an exception handler, and if so, what kind
        of exception handler. Most of this patch is just removing
        those old fields and adding new equivalent functions.

        This patch also implements the policy that we should never consider jettisoning
        code from exits that happen from an exception check to an op_catch (it might be worth
        considering a similar policy for 'throw'). We're choosing this policy because
        it will almost never be more expensive, in total, to execute the OSR exit than
        to execute the baseline variant of the code. When an exception is thrown, we do
        really expensive work, like call through to genericUnwind, and also create an error
        object with a stack trace. The cost of OSR exiting here is small in comparison to
        those other operations. And penalizing a CodeBlock for OSR exiting from an exception
        is silly because the basis of our implementation of exception handling in the
        upper tiers is to OSR exit on a caught exception. So we used to penalize
        ourselves for having an implementation that is correct w.r.t our design goals.

        I've verified this hypothesis with on v8-raytrace by adding a new 
        benchmark that throws with very high frequency. Implementing
        this policy on that benchmark results in about a 4-5% speed up.

        * bytecode/ExitKind.cpp:
        (JSC::exitKindToString):
        (JSC::exitKindMayJettison):
        (JSC::exitKindIsCountable): Deleted.
        * bytecode/ExitKind.h:
        * dfg/DFGJITCode.cpp:
        (JSC::DFG::JITCode::liveRegistersToPreserveAtExceptionHandlingCallSite):
        * dfg/DFGJITCompiler.cpp:
        (JSC::DFG::JITCompiler::noticeOSREntry):
        (JSC::DFG::JITCompiler::appendExceptionHandlingOSRExit):
        (JSC::DFG::JITCompiler::exceptionCheck):
        (JSC::DFG::JITCompiler::recordCallSiteAndGenerateExceptionHandlingOSRExitIfNeeded):
        * dfg/DFGJITCompiler.h:
        * dfg/DFGOSRExit.cpp:
        (JSC::DFG::OSRExit::OSRExit):
        * dfg/DFGOSRExit.h:
        (JSC::DFG::OSRExit::considerAddingAsFrequentExitSite):
        * dfg/DFGOSRExitBase.h:
        (JSC::DFG::OSRExitBase::OSRExitBase):
        (JSC::DFG::OSRExitBase::isExceptionHandler):
        (JSC::DFG::OSRExitBase::isGenericUnwindHandler):
        (JSC::DFG::OSRExitBase::considerAddingAsFrequentExitSite):
        * dfg/DFGOSRExitCompiler.cpp:
        * dfg/DFGOSRExitCompiler32_64.cpp:
        (JSC::DFG::OSRExitCompiler::compileExit):
        * dfg/DFGOSRExitCompiler64.cpp:
        (JSC::DFG::OSRExitCompiler::compileExit):
        * dfg/DFGOSRExitCompilerCommon.cpp:
        (JSC::DFG::handleExitCounts):
        (JSC::DFG::osrWriteBarrier):
        (JSC::DFG::adjustAndJumpToTarget):
        * dfg/DFGOSRExitCompilerCommon.h:
        (JSC::DFG::adjustFrameAndStackInOSRExitCompilerThunk):
        * ftl/FTLCompile.cpp:
        (JSC::FTL::mmAllocateDataSection):
        * ftl/FTLExitThunkGenerator.cpp:
        (JSC::FTL::ExitThunkGenerator::emitThunk):
        * ftl/FTLJITCode.cpp:
        (JSC::FTL::JITCode::liveRegistersToPreserveAtExceptionHandlingCallSite):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::callCheck):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExitArgumentsForPatchpointIfWillCatchException):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExit):
        (JSC::FTL::DFG::LowerDFGToLLVM::blessSpeculation):
        * ftl/FTLOSRExit.cpp:
        (JSC::FTL::OSRExitDescriptor::emitOSRExit):
        (JSC::FTL::OSRExitDescriptor::emitOSRExitLater):
        (JSC::FTL::OSRExitDescriptor::prepareOSRExitHandle):
        (JSC::FTL::OSRExit::OSRExit):
        (JSC::FTL::OSRExit::spillRegistersToSpillSlot):
        (JSC::FTL::OSRExit::recoverRegistersFromSpillSlot):
        (JSC::FTL::OSRExit::willArriveAtExitFromIndirectExceptionCheck):
        (JSC::FTL::OSRExit::willArriveAtOSRExitFromCallOperation):
        (JSC::FTL::exceptionTypeWillArriveAtOSRExitFromGenericUnwind): Deleted.
        (JSC::FTL::OSRExit::willArriveAtOSRExitFromGenericUnwind): Deleted.
        * ftl/FTLOSRExit.h:
        * ftl/FTLOSRExitCompiler.cpp:
        (JSC::FTL::compileStub):
        (JSC::FTL::compileFTLOSRExit):
        * ftl/FTLPatchpointExceptionHandle.cpp:
        (JSC::FTL::PatchpointExceptionHandle::scheduleExitCreation):
        (JSC::FTL::PatchpointExceptionHandle::scheduleExitCreationForUnwind):
        (JSC::FTL::PatchpointExceptionHandle::PatchpointExceptionHandle):
        (JSC::FTL::PatchpointExceptionHandle::createHandle):
        * ftl/FTLPatchpointExceptionHandle.h:

2016-01-28  Yusuke Suzuki  <utatane.tea@gmail.com>

        [B3] REGRESSION(r195395): testComplex(64, 128) asserts on Linux with GCC
        https://bugs.webkit.org/show_bug.cgi?id=153422

        Reviewed by Filip Pizlo.

        Previously proc.values() returns ValuesCollection (Not reference!).
        values.values takes const ValueCollection&.
        And later it produces IndexSet<Value>::Iterable<Procedure::ValuesCollection>,
        it holds const ValueCollection& as its member.
        But IndexSet<Value>::Iterable<Procedure::ValuesCollection> is just an instance.
        So after creating this, the lifetime of the ValueCollection const reference finished.

        To fix that, we hold ValuesCollection as a member of Procedure.
        And change the signature to const ValuesCollection& Procedure::values().

        * b3/B3Procedure.cpp:
        (JSC::B3::Procedure::Procedure):
        * b3/B3Procedure.h:
        (JSC::B3::Procedure::values):

2016-01-28  Joseph Pecoraro  <pecoraro@apple.com>

        Web Inspector: InspectorTimelineAgent doesn't need to recompile functions because it now uses the sampling profiler
        https://bugs.webkit.org/show_bug.cgi?id=153500
        <rdar://problem/24352458>

        Reviewed by Timothy Hatcher.

        Be more explicit about enabling legacy profiling.

        * jsc.cpp:
        * runtime/Executable.cpp:
        (JSC::ScriptExecutable::newCodeBlockFor):
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::hasLegacyProfiler):
        (JSC::JSGlobalObject::createProgramCodeBlock):
        (JSC::JSGlobalObject::createEvalCodeBlock):
        (JSC::JSGlobalObject::createModuleProgramCodeBlock):
        (JSC::JSGlobalObject::hasProfiler): Deleted.
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::supportsLegacyProfiling):
        (JSC::JSGlobalObject::supportsProfiling): Deleted.

2016-01-28  Yusuke Suzuki  <utatane.tea@gmail.com>

        Fix the B3 build with GCC 4.9.3
        https://bugs.webkit.org/show_bug.cgi?id=151624

        Reviewed by Filip Pizlo.

        Due to GCC 4.9's compiler issue[1], method calls inside (2 or so) nested lambdas need to use `this` to avoid internal compiler errors.
        [1]: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62272

        * b3/air/AirIteratedRegisterCoalescing.cpp:

2016-01-28  Filip Pizlo  <fpizlo@apple.com>

        LowerToAir::preferRightForResult() should resolve use count ties by selecting the child that is closest in an idom walk
        https://bugs.webkit.org/show_bug.cgi?id=153583

        Reviewed by Benjamin Poulain.

        This undoes the AsmBench/n-body regression in r195654 while preserving that revision's
        Kraken progression.

        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::LowerToAir):
        (JSC::B3::Air::LowerToAir::preferRightForResult):

2016-01-28  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] B3 Tail Call with Varargs do not restore callee saved registers
        https://bugs.webkit.org/show_bug.cgi?id=153579

        Reviewed by Michael Saboff.

        We were trashing the callee saved registers in Tail Calls.

        I just copied the code from DFG to fix this :)

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCallOrConstructVarargs):

2016-01-27  Filip Pizlo  <fpizlo@apple.com>

        B3 IntRange analysis should know more about shifting
        https://bugs.webkit.org/show_bug.cgi?id=153568

        Reviewed by Benjamin Poulain.

        This teaches the IntRange analysis that the result of a right shift is usually better than
        the worst-case mask based on the shift amount. In fact, you can reach useful conclusions
        from looking at the IntRange of the input. This helps because Octane/crypto does something
        like:

            CheckMul((@x & $268435455) >> 14, @y >> 14, ...)

        If you consider just the shifts, then this may overflow. But if you consider that @x is
        first masked, then the IntRange coming out of the first shift is tight enough to prove that
        the CheckMul cannot overflow.

        * b3/B3ReduceStrength.cpp:
        * b3/testb3.cpp:

2016-01-27  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] adjustFrameAndStackInOSRExitCompilerThunk() can trash values in FTL
        https://bugs.webkit.org/show_bug.cgi?id=153536

        Reviewed by Saam Barati.

        Workaround to get B3 working on ARM.

        * dfg/DFGOSRExitCompilerCommon.h:
        (JSC::DFG::adjustFrameAndStackInOSRExitCompilerThunk):
        The code was using the scratch registers in a few places.

        I initially tried to make is not use scratch registers anywhere
        but that looked super fragile.

        Instead, I just preserve the scratch registers. That's easy and
        it should be relatively cheap compared to everything done on OSR Exits.

2016-01-27  Konstantin Tokarev  <annulen@yandex.ru>

        [mips] Use reinterpret_cast_ptr to suppress alignment warnings.
        https://bugs.webkit.org/show_bug.cgi?id=153424

        Reviewed by Darin Adler.

        * runtime/JSGenericTypedArrayView.h:
        (JSC::JSGenericTypedArrayView::sortFloat):

2016-01-27  Per Arne Vollan  <peavo@outlook.com>

        [FTL][Win64] Compile fix.
        https://bugs.webkit.org/show_bug.cgi?id=153555

        Reviewed by Alex Christensen.

        MSVC does not accept preprocessor conditionals in macros.

        * ftl/FTLOSRExitCompiler.cpp:
        (JSC::FTL::compileStub):

2016-01-27  Filip Pizlo  <fpizlo@apple.com>

        Air::TmpWidth uses a stale pointer into its HashMap after it calls add()
        https://bugs.webkit.org/show_bug.cgi?id=153546

        Reviewed by Saam Barati.

        * b3/air/AirTmpWidth.cpp:
        (JSC::B3::Air::TmpWidth::recompute):

2016-01-27  Alexey Proskuryakov  <ap@apple.com>

        Remove ENABLE_CURRENTSRC
        https://bugs.webkit.org/show_bug.cgi?id=153545

        Reviewed by Simon Fraser.

        * Configurations/FeatureDefines.xcconfig:

2016-01-26  Benjamin Poulain  <benjamin@webkit.org>

        [JSC] When lowering B3 to Air, preferRightForResult() should prefer values from the same block
        https://bugs.webkit.org/show_bug.cgi?id=153477

        Reviewed by Filip Pizlo.

        In cases like this:

        Block #0
            @1 = something
            @2 = Jump #1
        Block #1
            @3 = something else
            @4 = Add(@3, @1)
            ...
            @42 = Branch(@x, #1, #2)

        B3LowerToAir would pick @1 for the argument copied
        for what goes into the UseDef side of Add.

        This created a bunch of moves that could never be coalesced.
        In Kraken's imaging-desaturate, there were enough Moves to slow
        down the hot loop.

        Ideally, we should not use UseCount for lowering. We should use
        the real liveness for preferRightForResult(), and a loop-weighted
        use-count for effective addresses. The problem is keeping the cost
        low for those simple helpers.

        In this patch, I went with a simple heuristic: prioritize the value
        defined in the same block for UseDef.

        There is one other way that would be cheap but a bit invasive:
        -Get rid of UseDef.
        -Make every ops, 3 operands.
        -Tell the register allocator to attempt aliasing of the 2 uses
         with the def.
        -If the allocator fails, just add a move as needed.

        For now, the simple heuristic seems okay for the cases have.

        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::preferRightForResult):

2016-01-26  Filip Pizlo  <fpizlo@apple.com>

        Tail duplication should break critical edges first
        https://bugs.webkit.org/show_bug.cgi?id=153530

        Reviewed by Benjamin Poulain.

        This speeds up Octane/boyer.

        * b3/B3DuplicateTails.cpp:

2016-01-26  Joseph Pecoraro  <pecoraro@apple.com>

        Generalize ResourceUsageData gathering to be used outside of ResourceUsageOverlay
        https://bugs.webkit.org/show_bug.cgi?id=153509
        <rdar://problem/24354291>

        Reviewed by Andreas Kling.

        * heap/Heap.h:
        * heap/HeapInlines.h:
        (JSC::Heap::didAllocateBlock):
        (JSC::Heap::didFreeBlock):
        Rename the ENABLE flag.

2016-01-26  Csaba Osztrogonác  <ossy@webkit.org>

        [B3] Fix control reaches end of non-void function GCC warning after r195139
        https://bugs.webkit.org/show_bug.cgi?id=153426

        Reviewed by Michael Catanzaro.

        * b3/air/AirArg.h:
        (JSC::B3::Air::Arg::cooled):

2016-01-26  Saam barati  <sbarati@apple.com>

        testb3 and testAir should be compiled under -O0
        https://bugs.webkit.org/show_bug.cgi?id=153520

        Reviewed by Benjamin Poulain.

        * JavaScriptCore.xcodeproj/project.pbxproj:

2016-01-26  Filip Pizlo  <fpizlo@apple.com>

        B3's integer range analysis should know that Mul'ing two sufficiently small numbers will yield a number that still has a meaningful range
        https://bugs.webkit.org/show_bug.cgi?id=153518

        Reviewed by Benjamin Poulain.

        Octane/encrypt had an addition overflow check that can be proved away by being sufficiently
        sneaky about the analysis of adds, multiplies, and shifts.

        I almost added these optimizations to the DFG integer range optimization phase. That phase is
        very complicated. B3's integer range analysis is trivial. So I added it to B3. Eventually
        we'll want this same machinery in the DFG also.

        8% speed-up on Octane/encrypt.

        * b3/B3ReduceStrength.cpp:
        * b3/B3Value.cpp:
        (JSC::B3::Value::dump): Dumping a constant value's name now dumps its value. This makes a huge difference for reading IR.
        (JSC::B3::Value::cloneImpl):
        (JSC::B3::Value::deepDump):

2016-01-26  Filip Pizlo  <fpizlo@apple.com>

        It should be possible to disable FTL for a range like we disable DFG for a range
        https://bugs.webkit.org/show_bug.cgi?id=153511

        Reviewed by Geoffrey Garen.

        * dfg/DFGTierUpCheckInjectionPhase.cpp:
        (JSC::DFG::TierUpCheckInjectionPhase::run):
        * runtime/Options.h:

2016-01-26  Filip Pizlo  <fpizlo@apple.com>

        Shifts by an amount computed using BitAnd with a mask that subsumes the shift's own mask should be rewired around the BitAnd
        https://bugs.webkit.org/show_bug.cgi?id=153505

        Reviewed by Saam Barati.

        Turn this: Shl(@x, BitAnd(@y, 63))
        Into this: Shl(@x, @y)

        It matters for Octane/crypto.

        We should also stop FTL from generating such code, but even if we did that, we'd still want
        this optimization in case user code did the BitAnd.

        Also we can't stop the FTL from generating such code yet, because when targetting LLVM, you
        must mask your shifts this way.

        * b3/B3ReduceStrength.cpp:

2016-01-26  Filip Pizlo  <fpizlo@apple.com>

        The thing that B3 uses to describe a stack slot should not be a Value
        https://bugs.webkit.org/show_bug.cgi?id=153491
        rdar://problem/24349446

        Reviewed by Geoffrey Garen and Saam Barati.

        Prior to this change, B3 represented stack slots by having a StackSlotValue that carried
        two meanings:

        - It represented a stack slot.

        - It was a kind of Value for getting the base of the stack slot.

        This seems like a good idea until you consider the following issues.

        1) A Value can be killed if it is on an unreachable path, or if it has no effects and
           nobody refers to it. But the FTL uses StackSlotValue to allocate space on the stack.
           When it does this, it doesn't want it to be killed. It will dereference the object, so
           killing it is a bug.

        2) A premise of B3 is that it should be always legal to perform the following
           transformation on a value:

           value->replaceWithIdentity(insertionSet.insertValue(index, proc.clone(value)));

           This inserts a new value just before the old one. The new value is a clone of the old
           one. Then the old one is essentially deleted (anything that becomes an identity dies
           shortly thereafter). Problem (1) prevents this from being legal, which breaks a major
           premise of B3 IR.

        3) A premise of B3 is that it should be always legal to perform the following
           transformation on a value:

           Before:
                   @42 = Thing(...)

           After:
                   Branch(@doesntMatter, #yes, #no)
               BB#yes:
                   @42_one = Thing(...)
                   Upsilon(@42_one, ^42)
                   Jump(#done)
               BB#no:
                   @42_two = Thing(...)
                   Upsilon(@42_two, ^42)
                   Jump(#done)
               BB#done:
                   @42 = Phi()

           But prior to this change, such a transformation makes absolutely no sense for
           StackSlot. It will "work" in the sense that the compiler will proceed undaunted, but
           it will disable SSA fix-up for the cloned stack slot and we will end up allocating two
           stack slots instead of one, and then we will assume that they both escape, which will
           disable efficient stack allocation. Note that the moral equivalent of this
           transformation could already happen due to tail duplication, and the only reason why
           it's not a bug right now is that we happen to hoist stack slots to the root block. But
           the whole point of our stack slots was supposed to be that they do not have to be
           hoisted.

        This change fixes this issue by splitting StackSlotValue into two things: SlotBaseValue,
        which is a pure operation for getting the base address of a StackSlot, and StackSlot,
        which is a representation of the actual stack slot. StackSlot cannot get duplicated and
        can only be killed if it's anonymous. SlotBaseValue can be killed, moved, cloned,
        hoisted, etc. Since it has no effects and it has a ValueKey, it's one of the most
        permissive Values in the IR, just as one would hope (after all, there is actually zero
        code that needs to execute to evaluate SlotBaseValue).

        This fixes a crash that we saw with GuardMalloc and ASan. It also makes the IR a lot more
        easy to reason about.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/B3EliminateCommonSubexpressions.cpp:
        * b3/B3FixSSA.cpp:
        (JSC::B3::demoteValues):
        (JSC::B3::fixSSA):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::run):
        (JSC::B3::Air::LowerToAir::effectiveAddr):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3Opcode.cpp:
        (WTF::printInternal):
        * b3/B3Opcode.h:
        * b3/B3Procedure.cpp:
        (JSC::B3::Procedure::setBlockOrderImpl):
        (JSC::B3::Procedure::addStackSlot):
        (JSC::B3::Procedure::addAnonymousStackSlot):
        (JSC::B3::Procedure::clone):
        (JSC::B3::Procedure::dump):
        (JSC::B3::Procedure::blocksInPostOrder):
        (JSC::B3::Procedure::deleteStackSlot):
        (JSC::B3::Procedure::deleteValue):
        (JSC::B3::Procedure::calleeSaveRegisters):
        (JSC::B3::Procedure::addStackSlotIndex):
        (JSC::B3::Procedure::addValueIndex):
        * b3/B3Procedure.h:
        (JSC::B3::Procedure::setBlockOrder):
        (JSC::B3::Procedure::StackSlotsCollection::StackSlotsCollection):
        (JSC::B3::Procedure::StackSlotsCollection::size):
        (JSC::B3::Procedure::StackSlotsCollection::at):
        (JSC::B3::Procedure::StackSlotsCollection::operator[]):
        (JSC::B3::Procedure::StackSlotsCollection::iterator::iterator):
        (JSC::B3::Procedure::StackSlotsCollection::iterator::operator*):
        (JSC::B3::Procedure::StackSlotsCollection::iterator::operator++):
        (JSC::B3::Procedure::StackSlotsCollection::iterator::operator==):
        (JSC::B3::Procedure::StackSlotsCollection::iterator::operator!=):
        (JSC::B3::Procedure::StackSlotsCollection::iterator::findNext):
        (JSC::B3::Procedure::StackSlotsCollection::begin):
        (JSC::B3::Procedure::StackSlotsCollection::end):
        (JSC::B3::Procedure::stackSlots):
        (JSC::B3::Procedure::ValuesCollection::ValuesCollection):
        * b3/B3ReduceStrength.cpp:
        * b3/B3SlotBaseValue.cpp: Copied from Source/JavaScriptCore/b3/B3StackSlotValue.cpp.
        (JSC::B3::SlotBaseValue::~SlotBaseValue):
        (JSC::B3::SlotBaseValue::dumpMeta):
        (JSC::B3::SlotBaseValue::cloneImpl):
        (JSC::B3::StackSlotValue::~StackSlotValue): Deleted.
        (JSC::B3::StackSlotValue::dumpMeta): Deleted.
        (JSC::B3::StackSlotValue::cloneImpl): Deleted.
        * b3/B3SlotBaseValue.h: Copied from Source/JavaScriptCore/b3/B3StackSlotValue.h.
        * b3/B3StackSlot.cpp: Added.
        (JSC::B3::StackSlot::~StackSlot):
        (JSC::B3::StackSlot::dump):
        (JSC::B3::StackSlot::deepDump):
        (JSC::B3::StackSlot::StackSlot):
        * b3/B3StackSlot.h: Added.
        (JSC::B3::StackSlot::byteSize):
        (JSC::B3::StackSlot::kind):
        (JSC::B3::StackSlot::isLocked):
        (JSC::B3::StackSlot::index):
        (JSC::B3::StackSlot::offsetFromFP):
        (JSC::B3::StackSlot::setOffsetFromFP):
        (JSC::B3::DeepStackSlotDump::DeepStackSlotDump):
        (JSC::B3::DeepStackSlotDump::dump):
        (JSC::B3::deepDump):
        * b3/B3StackSlotValue.cpp: Removed.
        * b3/B3StackSlotValue.h: Removed.
        * b3/B3Validate.cpp:
        * b3/B3Value.cpp:
        (JSC::B3::Value::effects):
        (JSC::B3::Value::key):
        (JSC::B3::Value::checkOpcode):
        * b3/B3ValueKey.cpp:
        (JSC::B3::ValueKey::materialize):
        * b3/air/AirCode.cpp:
        (JSC::B3::Air::Code::addBlock):
        (JSC::B3::Air::Code::addStackSlot):
        (JSC::B3::Air::Code::addSpecial):
        * b3/air/AirCode.h:
        * b3/air/AirStackSlot.cpp:
        (JSC::B3::Air::StackSlot::setOffsetFromFP):
        (JSC::B3::Air::StackSlot::dump):
        (JSC::B3::Air::StackSlot::deepDump):
        (JSC::B3::Air::StackSlot::StackSlot):
        * b3/air/AirStackSlot.h:
        (JSC::B3::Air::StackSlot::alignment):
        (JSC::B3::Air::StackSlot::b3Slot):
        (JSC::B3::Air::StackSlot::offsetFromFP):
        (WTF::printInternal):
        (JSC::B3::Air::StackSlot::value): Deleted.
        * b3/testb3.cpp:
        (JSC::B3::testStackSlot):
        (JSC::B3::testStoreLoadStackSlot):
        * ftl/FTLB3Compile.cpp:
        * ftl/FTLB3Output.cpp:
        (JSC::FTL::Output::appendTo):
        (JSC::FTL::Output::lockedStackSlot):
        (JSC::FTL::Output::neg):
        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::framePointer):
        (JSC::FTL::Output::constBool):
        (JSC::FTL::Output::constInt32):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::lower):
        * ftl/FTLState.h:

2016-01-26  Benjamin Poulain  <benjamin@webkit.org>

        Remove a useless #include
        https://bugs.webkit.org/show_bug.cgi?id=153474

        Reviewed by Alexey Proskuryakov.

        * b3/B3ReduceStrength.cpp:

2016-01-26  Alex Christensen  <achristensen@webkit.org>

        [Win] Fix clean build after r195545.
        ​https://bugs.webkit.org/show_bug.cgi?id=153434

        * CMakeLists.txt:
        * PlatformWin.cmake:
        Derived sources need to be copied after the build, but everything else should be copied before.
        This should fix ews issues like the one seen in bug 153473.

2016-01-25  Filip Pizlo  <fpizlo@apple.com>

        FTLB3Output should maintain good block order like the LLVM one does
        https://bugs.webkit.org/show_bug.cgi?id=152222

        Reviewed by Geoffrey Garen.

        This fixes FTLB3Output to emit an ordered B3 IR. This makes inspecting IR *a lot* easier.
        It will also be a performance win whenever we use range-based data structures for
        liveness.

        Also two small other changes:
        - Added some more dumping in integer range optimization phase.
        - Refined the disassembler's printing of instruction width suffixes so that "jzl" is not
          a thing. It was using "l" as the suffix because jumps take a 32-bit immediate.

        * b3/B3Procedure.cpp:
        (JSC::B3::Procedure::addBlock):
        (JSC::B3::Procedure::setBlockOrderImpl):
        (JSC::B3::Procedure::clone):
        * b3/B3Procedure.h:
        (JSC::B3::Procedure::frontendData):
        (JSC::B3::Procedure::setBlockOrder):
        * dfg/DFGIntegerRangeOptimizationPhase.cpp:
        * disassembler/udis86/udis86_syn-att.c:
        (ud_translate_att):
        * ftl/FTLB3Output.cpp:
        (JSC::FTL::Output::initialize):
        (JSC::FTL::Output::newBlock):
        (JSC::FTL::Output::applyBlockOrder):
        (JSC::FTL::Output::appendTo):
        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::setFrequency):
        (JSC::FTL::Output::insertNewBlocksBefore):
        (JSC::FTL::Output::callWithoutSideEffects):
        (JSC::FTL::Output::newBlock): Deleted.
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::lower):

2016-01-25  Skachkov Oleksandr  <gskachkov@gmail.com>

        [ES6] Arrow function syntax. Arrow function specific features. Lexical bind "arguments"
        https://bugs.webkit.org/show_bug.cgi?id=145132

        Reviewed by Saam Barati.
        
        Added support of ES6 arrow function specific feature, lexical bind of arguments. 
        http://www.ecma-international.org/ecma-262/6.0/#sec-arrow-function-definitions-runtime-semantics-evaluation
        'arguments' variable in arrow function must resolve to a binding in a lexically enclosing environment.
        In srict mode it points to arguments object, and in non-stric mode it points to arguments object or varible 
        with name 'arguments' if it was declared. 

        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::BytecodeGenerator):
        * parser/Parser.h:
        (JSC::Scope::Scope):
        (JSC::Scope::setSourceParseMode):
        (JSC::Scope::isArrowFunction):
        (JSC::Scope::collectFreeVariables):
        (JSC::Scope::setIsArrowFunction):
        * tests/es6.yaml:
        * tests/stress/arrowfunction-lexical-bind-arguments-non-strict-1.js: Added.
        * tests/stress/arrowfunction-lexical-bind-arguments-non-strict-2.js: Added.
        * tests/stress/arrowfunction-lexical-bind-arguments-strict.js: Added.

2016-01-25  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] We should never use x18 on iOS ARM64
        https://bugs.webkit.org/show_bug.cgi?id=153461

        Reviewed by Filip Pizlo.

        The register x18 is reserved in the iOS variant of the ARM64 ABI.

        The weird thing is: if you use it, its value will change completely
        randomly. It looks like it is changed by the system on interrupts.

        This patch adds x18 to the reserved register and add assertions
        to the assembler to prevent similar problems in the future.

        * assembler/ARM64Assembler.h:
        (JSC::ARM64Assembler::xOrSp):
        (JSC::ARM64Assembler::xOrZr):
        * assembler/AbstractMacroAssembler.h:
        (JSC::isIOS): Deleted.
        * assembler/AssemblerCommon.h:
        (JSC::isIOS):
        * jit/RegisterSet.cpp:
        (JSC::RegisterSet::reservedHardwareRegisters):

2016-01-25  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r195550.
        https://bugs.webkit.org/show_bug.cgi?id=153471

        broke animometer bot (and now we have crash logs!) (Requested
        by kling on #webkit).

        Reverted changeset:

        "Restore CodeBlock jettison code Geoff accidentally removed"
        https://bugs.webkit.org/show_bug.cgi?id=151241
        http://trac.webkit.org/changeset/195550

2016-01-25  Andreas Kling  <akling@apple.com>

        MarkedSpace should have more precise allocators.
        <https://webkit.org/b/153448>
        <rdar://problem/23897477>

        Reviewed by Geoffrey Garen.

        The four classes responsible for the bulk of MarkedBlock allocations today are:

            - FunctionCodeBlock (640 bytes)
            - UnlinkedFunctionCodeBlock (304 bytes)
            - FunctionExecutable (168 bytes)
            - UnlinkedFunctionExecutable (144 bytes)

        Due to the size class distribution in MarkedSpace, we've been wasting quite a lot
        of heap space on these objects. Our "precise" allocators allowed allocation sizes
        in 16-byte increments up to 128 bytes, but after that point, we'd only allocate
        in 256-byte size increments.

        Thus each instance of those classes would waste space as follows:

            - FunctionCodeBlock (768-byte cell, 128 bytes wasted)
            - UnlinkedFunctionCodeBlock (512-byte cell, 208 bytes wasted)
            - FunctionExecutable(256-byte cell, 88 bytes wasted)
            - UnlinkedFunctionExecutable(256-byte cell, 112 bytes wasted)

        This patch raises the limit for precise allocations from 128 to 768, allowing us
        to allocate these objects with far better space efficiency.

        The cost of this is 7kB worth of MarkedAllocators and 70 (~2x) more allocators to
        iterate whenever we iterate all the allocators.

        * heap/MarkedSpace.h:
        * heap/MarkedSpace.cpp:
        (JSC::MarkedSpace::MarkedSpace):
        (JSC::MarkedSpace::resetAllocators):
        (JSC::MarkedSpace::forEachAllocator):
        (JSC::MarkedSpace::isPagedOut):

2016-01-25  Filip Pizlo  <fpizlo@apple.com>

        Fix the comment about FTL_USES_B3.

        * dfg/DFGCommon.h:

2016-01-25  Filip Pizlo  <fpizlo@apple.com>

        Switch FTL to B3 on X86_64/Mac
        https://bugs.webkit.org/show_bug.cgi?id=153445

        Rubber stamped by Geoffrey Garen.

        This finally switches from LLVM to B3 in the FTL on X86_64 on the Mac. We recommend that other
        X86_64 platforms make the switch as well. We will be focusing our performance work on B3 rather
        than LLVM in the future. ARM64 support is also coming soon, so we will be able to remove FTL
        LLVM code once that lands.

        Right now this mostly appears as perf-neutral on the major tests. However, it does have the
        following immediate benefits:

        - Dramatic reduction in FTL compile times, on the order of 5x-10x. This means huge speed-ups in
          shorter-running tests like V8Spider (21%) and JSRegress (8%).

        - It makes the FTL simpler and more robust because we don't have to do stackmap section
          parsing. This makes it easier to add new FTL features. We are already working on features,
          like the sampling profiler, which will only have a FTL B3 implementation.

        - Speed-ups on some throughput benchmarks like mandreel, richards, imaging-gaussian-blur. It's
          still a slow down on other throughput benchmarks, though.

        We started writing B3 in October, so it's pretty awesome that the throughput of the code it
        generates is already on par with LLVM.
        
        This does not fundamentally change how the FTL works. FTL was built to lower DFG IR to a C-like
        SSA IR, and then rely on powerful SSA optimizations and comprehensive instruction selection and
        register allocation to turn that code into something that runs fast. B3 also has a C-like SSA
        IR, has an instruction selector that is in some ways more powerful than LLVM's (B3 does global
        instruction selection rather than block-local like LLVM), and it has a register allocator that
        is in some ways more powerful also (B3 uses IRC, a mature graph coloring allocator, while LLVM
        does not do graph coloring). We expect FTL B3's performance to improve a lot after we turn it
        on and can focus our efforts on tuning it.

        I didn't find any test regressions after running both JSC tests and layout tests. Basic
        browsing still works. JetStream performance difference is within the margin of error. EWS is
        happy.

        * dfg/DFGCommon.h:

2016-01-25  Andreas Kling  <akling@apple.com>

        Restore CodeBlock jettison code Geoff accidentally removed
        https://bugs.webkit.org/show_bug.cgi?id=151241

        Rubber-stamped by Geoffrey Garen.

        Geoff meant to add this back in <http://trac.webkit.org/changeset/190827>
        but missed.

        Then he added it back in, but it was rolled out due to a crash on Animometer.
        I can no longer produce a crash on Animometer, either with today's version of
        the benchmark, or the one that existed at the time of the rollout.

        Given this, let's roll it back in and see how it goes.

        * bytecode/CodeBlock.cpp:
        (JSC::timeToLive):
        (JSC::CodeBlock::shouldJettisonDueToOldAge):

2016-01-22  Filip Pizlo  <fpizlo@apple.com>

        mandreel should run just as fast in FTL B3 as FTL LLVM
        https://bugs.webkit.org/show_bug.cgi?id=153394

        Reviewed by Gavin Barraclough.

        This fixes two performance bugs and one disassembler bug.

        - B3 now turns Branches into Jumps when they are dominated by a Check on the same
          condition. This is like the opposite of foldPathConstants() was doing.

        - Air now supports adding to 8-bit or 16-bit memory locations on x86. B3 now knows how to
          lower Store8(Add(Load8Z(...))) and various other things to these new instructions.

        - Disassembler now knows to print out the instruction's width, whenever it has one.
          Previously, we'd print movb, movw, movl, and movq as "mov", which is unhelpful if
          you're storing an immediate, for example.

        This adds a bunch of tests for the new instruction forms. This is a big speed-up on
        mandreel. It makes us just as fast as LLVM on that benchmark.

        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::add32):
        (JSC::MacroAssemblerX86Common::add8):
        (JSC::MacroAssemblerX86Common::add16):
        (JSC::MacroAssemblerX86Common::add32AndSetFlags):
        (JSC::MacroAssemblerX86Common::clz32AfterBsr):
        * assembler/X86Assembler.h:
        (JSC::X86Assembler::addl_rm):
        (JSC::X86Assembler::addb_rm):
        (JSC::X86Assembler::addw_rm):
        (JSC::X86Assembler::addl_ir):
        (JSC::X86Assembler::addl_im):
        (JSC::X86Assembler::addb_im):
        (JSC::X86Assembler::addw_im):
        (JSC::X86Assembler::addq_rr):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::addr):
        (JSC::B3::Air::LowerToAir::loadPromiseAnyOpcode):
        (JSC::B3::Air::LowerToAir::loadPromise):
        (JSC::B3::Air::LowerToAir::tryAppendStoreBinOp):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3PureCSE.cpp:
        (JSC::B3::PureCSE::clear):
        (JSC::B3::PureCSE::findMatch):
        (JSC::B3::PureCSE::process):
        * b3/B3PureCSE.h:
        * b3/B3ReduceStrength.cpp:
        * b3/air/AirOpcode.opcodes:
        * b3/testb3.cpp:
        (JSC::B3::testNegPtr):
        (JSC::B3::testStoreAddLoad32):
        (JSC::B3::testStoreAddLoadImm32):
        (JSC::B3::testStoreAddLoad8):
        (JSC::B3::testStoreAddLoadImm8):
        (JSC::B3::testStoreAddLoad16):
        (JSC::B3::testStoreAddLoadImm16):
        (JSC::B3::testStoreAddLoad64):
        (JSC::B3::testStoreAddLoadImm64):
        (JSC::B3::testStoreAddLoad32Index):
        (JSC::B3::testStoreAddLoadImm32Index):
        (JSC::B3::testStoreAddLoad8Index):
        (JSC::B3::testStoreAddLoadImm8Index):
        (JSC::B3::testStoreAddLoad16Index):
        (JSC::B3::testStoreAddLoadImm16Index):
        (JSC::B3::testStoreAddLoad64Index):
        (JSC::B3::testStoreAddLoadImm64Index):
        (JSC::B3::testStoreSubLoad):
        (JSC::B3::run):
        (JSC::B3::testStoreAddLoad): Deleted.
        * disassembler/udis86/udis86_syn-att.c:
        (ud_translate_att):

2016-01-25  Alex Christensen  <achristensen@webkit.org>

        [Win] Copy forwarding headers before building a project
        https://bugs.webkit.org/show_bug.cgi?id=153434

        Reviewed by Brent Fulgham.

        * CMakeLists.txt:
        * PlatformWin.cmake:

2016-01-25  Andreas Kling  <akling@apple.com>

        Reduce number of Structures created at startup.
        <https://webkit.org/b/153399>

        Reviewed by Darin Adler.

        For *Constructor and *Prototype objects that are only created once per JSGlobalObject,
        build up the Structures using addPropertyWithoutTransition() helpers to avoid creating
        tons of transitions that would just end up floating around and never getting used.

        * inspector/JSInjectedScriptHostPrototype.cpp:
        (Inspector::JSInjectedScriptHostPrototype::finishCreation):
        * inspector/JSJavaScriptCallFramePrototype.cpp:
        (Inspector::JSJavaScriptCallFramePrototype::finishCreation):
        * runtime/ArrayPrototype.cpp:
        (JSC::ArrayPrototype::finishCreation):
        * runtime/ConsolePrototype.cpp:
        (JSC::ConsolePrototype::finishCreation):
        * runtime/DatePrototype.cpp:
        (JSC::DatePrototype::finishCreation):
        * runtime/JSArrayBufferConstructor.cpp:
        (JSC::JSArrayBufferConstructor::finishCreation):
        * runtime/JSArrayBufferPrototype.cpp:
        (JSC::JSArrayBufferPrototype::finishCreation):
        * runtime/JSObject.cpp:
        (JSC::JSObject::putDirectNativeFunctionWithoutTransition):
        (JSC::JSObject::putDirectBuiltinFunctionWithoutTransition): Deleted.
        * runtime/JSObject.h:
        * runtime/JSPromiseConstructor.cpp:
        (JSC::JSPromiseConstructor::addOwnInternalSlots):
        * runtime/JSPromisePrototype.cpp:
        (JSC::JSPromisePrototype::addOwnInternalSlots):
        * runtime/JSTypedArrayViewConstructor.cpp:
        (JSC::JSTypedArrayViewConstructor::finishCreation):
        * runtime/JSTypedArrayViewPrototype.cpp:
        (JSC::JSTypedArrayViewPrototype::finishCreation):
        * runtime/MapIteratorPrototype.cpp:
        (JSC::MapIteratorPrototype::finishCreation):
        * runtime/MapPrototype.cpp:
        (JSC::MapPrototype::finishCreation):
        * runtime/NumberPrototype.cpp:
        (JSC::NumberPrototype::finishCreation):
        * runtime/ObjectConstructor.cpp:
        (JSC::ObjectConstructor::finishCreation):
        * runtime/ObjectPrototype.cpp:
        (JSC::ObjectPrototype::finishCreation):
        * runtime/SetIteratorPrototype.cpp:
        (JSC::SetIteratorPrototype::finishCreation):
        * runtime/SetPrototype.cpp:
        (JSC::SetPrototype::finishCreation):
        * runtime/StringPrototype.cpp:
        (JSC::StringPrototype::finishCreation):
        * runtime/WeakMapPrototype.cpp:
        (JSC::WeakMapPrototype::finishCreation):
        * runtime/WeakSetPrototype.cpp:
        (JSC::WeakSetPrototype::finishCreation):

2016-01-22  Filip Pizlo  <fpizlo@apple.com>

        B3 should strength-reduce division by a constant
        https://bugs.webkit.org/show_bug.cgi?id=153386

        Reviewed by Benjamin Poulain.

        You can turn a 32-bit division by a constant into a 64-bit multiplication by a constant
        plus some shifts. A book called "Hacker's Delight" has a bunch of math about this. The
        hard part is finding the constant by which to multiply, and the amount by which to shift.
        The book tells you some theroems, but you still have to turn that into code by thinking
        deep thoughts. Luckily I was able to avoid that because it turns out that LLVM already
        has code for this. It's called APInt::magic(), where APInt is their class for reasoning
        about integers.

        The code has a compatible license to ours and we have already in the past taken code from
        LLVM. So, that's what this patch does. The LLVM code is localized in
        B3ComputeDivisionMagic.h. Then reduceStrength() uses that to construct the multiply+shift
        sequence.

        This is an enormous speed-up on AsmBench-0.9/bigfib.cpp.js. It makes us as fast on that
        test as LLVM. It reduces our deficit on AsmBench to 1.5%. Previously it was 4.5%.

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/B3ComputeDivisionMagic.h: Added.
        (JSC::B3::computeDivisionMagic):
        * b3/B3ReduceStrength.cpp:

2016-01-22  Saam barati  <sbarati@apple.com>

        genericUnwind might overflow the instructions() vector when catching an FTL exception
        https://bugs.webkit.org/show_bug.cgi?id=153383

        Reviewed by Benjamin Poulain.

        * jit/JITExceptions.cpp:
        (JSC::genericUnwind):

2016-01-22  Mark Lam  <mark.lam@apple.com>

        We should OSR exit with Int52Overflow when we fail to make an Int52 where we expect one.
        https://bugs.webkit.org/show_bug.cgi?id=153379

        Reviewed by Filip Pizlo.

        In DFG::Graph::addShouldSpeculateMachineInt(), we check
        !hasExitSite(add, Int52Overflow) when determining whether it's ok to speculate
        that an operand is of type Int52 or not.  However, the Int52Rep code that
        converts a double to Int52 will OSR exit with exit kind BadType instead.
        This renders the hasExitSite() check in addShouldSpeculateMachineInt() useless.
        This patch fixes this by changing Int52Rep to OSR exit with exit kind
        Int52Overflow instead when it fails to convert a double to an Int52.

        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::terminateSpeculativeExecution):
        (JSC::DFG::SpeculativeJIT::typeCheck):
        (JSC::DFG::SpeculativeJIT::usedRegisters):
        * dfg/DFGSpeculativeJIT.h:
        (JSC::DFG::SpeculativeJIT::needsTypeCheck):
        (JSC::DFG::SpeculativeJIT::speculateStringObjectForStructure):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::typeCheck):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendTypeCheck):
        (JSC::FTL::DFG::LowerDFGToLLVM::doubleToStrictInt52):

2016-01-22  Saam barati  <sbarati@apple.com>

        Current implementation of Parser::createSavePoint is a foot gun
        https://bugs.webkit.org/show_bug.cgi?id=153293

        Reviewed by Oliver Hunt.

        The previous use of SavePoint (up until this patch)
        really meant that we're saving the LexerState. This
        was so poorly named that it was being misused all over
        our parser. For example, anything that parsed an
        AssignmentExpression between saving/restoring really
        wanted to save both Lexer state and Parser state.

        This patch changes SavePoint to mean save all the
        state. The old SavePoint is renamed to LexerState with
        corresponding internal<Save/Restore>LexerState functions.
        The old <save/restore>State() function is renamed to
        internal<Save/Restore>ParserState().

        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::Parser):
        (JSC::Parser<LexerType>::parseInner):
        (JSC::Parser<LexerType>::isArrowFunctionParameters):
        (JSC::Parser<LexerType>::parseSourceElements):
        (JSC::Parser<LexerType>::declareRestOrNormalParameter):
        (JSC::Parser<LexerType>::parseAssignmentElement):
        (JSC::Parser<LexerType>::parseDestructuringPattern):
        (JSC::Parser<LexerType>::parseForStatement):
        (JSC::Parser<LexerType>::parseStatement):
        (JSC::Parser<LexerType>::parseFunctionParameters):
        (JSC::Parser<LexerType>::parseFunctionInfo):
        (JSC::Parser<LexerType>::parseClass):
        (JSC::Parser<LexerType>::parseExpression):
        (JSC::Parser<LexerType>::parseAssignmentExpression):
        (JSC::Parser<LexerType>::parseYieldExpression):
        (JSC::Parser<LexerType>::parseConditionalExpression):
        (JSC::Parser<LexerType>::parseBinaryExpression):
        (JSC::Parser<LexerType>::parseObjectLiteral):
        (JSC::Parser<LexerType>::parseStrictObjectLiteral):
        (JSC::Parser<LexerType>::parseArrayLiteral):
        (JSC::Parser<LexerType>::parsePrimaryExpression):
        (JSC::Parser<LexerType>::parseMemberExpression):
        (JSC::Parser<LexerType>::parseUnaryExpression):
        * parser/Parser.h:
        (JSC::Parser::hasError):
        (JSC::Parser::internalSaveParserState):
        (JSC::Parser::restoreParserState):
        (JSC::Parser::internalSaveLexerState):
        (JSC::Parser::restoreLexerState):
        (JSC::Parser::createSavePointForError):
        (JSC::Parser::createSavePoint):
        (JSC::Parser::restoreSavePointWithError):
        (JSC::Parser::restoreSavePoint):
        (JSC::Parser::saveState): Deleted.
        (JSC::Parser::restoreState): Deleted.

2016-01-22  Keith Miller  <keith_miller@apple.com>

        Unreviewed. fnormal => normal.

        * tests/es6.yaml:

2016-01-22  Keith Miller  <keith_miller@apple.com>

        Unreviewed. Forgot to git stash pop some of the changes.
        This should mark the rest of the es6 tests as passing.

        * tests/es6.yaml:

2016-01-22  Keith Miller  <keith_miller@apple.com>

        Unreviewed. Mark es6 tests as passing.

        * tests/es6.yaml:

2016-01-22  Saam barati  <sbarati@apple.com>

        op_profile_type 32-bit LLInt implementation has a bug
        https://bugs.webkit.org/show_bug.cgi?id=153368

        Reviewed by Michael Saboff.

        r189293 changed which registers were used, specifically
        using t5 instead of t4. That change forgot to replace
        t4 with t5 in one specific instance.

        * llint/LowLevelInterpreter32_64.asm:

2016-01-22  Filip Pizlo  <fpizlo@apple.com>

        B3 should reduce obvious forms of Shl(SShr)
        https://bugs.webkit.org/show_bug.cgi?id=153362

        Reviewed by Mark Lam and Saam Barati.

        This is a 40% speed-up in AsmBench-0.9/dry.c.js.

        * b3/B3ReduceStrength.cpp:
        * b3/testb3.cpp:
        (JSC::B3::testStore16Load16Z):
        (JSC::B3::testSShrShl32):
        (JSC::B3::testSShrShl64):
        (JSC::B3::zero):
        (JSC::B3::run):

2016-01-22  Alex Christensen  <achristensen@webkit.org>

        Fix internal Windows build
        https://bugs.webkit.org/show_bug.cgi?id=153364
        <rdar://problem/24296328>

        Reviewed by Brent Fulgham.

        * PlatformWin.cmake:
        The internal build does not build JavaScriptCore with WTF, so it does not automatically link to winmm.lib
        like it does when everything is built together.

2016-01-22  Keith Miller  <keith_miller@apple.com>

        Equivalence PropertyCondition needs to check the offset it uses to load the value from is not invalidOffset
        https://bugs.webkit.org/show_bug.cgi?id=152912

        Reviewed by Mark Lam.

        When checking the validity of an Equivalence PropertyCondition we do not check that the offset returned by
        the structure of the object in the equivalence condition is valid. The offset might be wrong for many reasons.
        The one we now test for is when the GlobalObject has a property that becomes a variable the property is deleted
        thus the offset is now invalid.

        * bytecode/PropertyCondition.cpp:
        (JSC::PropertyCondition::isStillValidAssumingImpurePropertyWatchpoint):
        * tests/stress/global-property-into-variable-get-from-scope.js: Added.

2016-01-22  Keith Miller  <keith_miller@apple.com>

        [ES6] Add Symbol.species properties to the relevant constructors
        https://bugs.webkit.org/show_bug.cgi?id=153339

        Reviewed by Michael Saboff.

        This patch adds Symbol.species to the RegExp, Array, TypedArray, Map, Set, ArrayBuffer, and
        Promise constructors.  The functions that use these properties will be added in a later
        patch.

        * builtins/GlobalObject.js:
        (speciesGetter):
        * runtime/ArrayConstructor.cpp:
        (JSC::ArrayConstructor::finishCreation):
        * runtime/ArrayConstructor.h:
        (JSC::ArrayConstructor::create):
        * runtime/BooleanConstructor.h:
        (JSC::BooleanConstructor::create):
        * runtime/CommonIdentifiers.h:
        * runtime/DateConstructor.h:
        (JSC::DateConstructor::create):
        * runtime/ErrorConstructor.h:
        (JSC::ErrorConstructor::create):
        * runtime/JSArrayBufferConstructor.cpp:
        (JSC::JSArrayBufferConstructor::finishCreation):
        (JSC::JSArrayBufferConstructor::create):
        * runtime/JSArrayBufferConstructor.h:
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        * runtime/JSInternalPromiseConstructor.cpp:
        (JSC::JSInternalPromiseConstructor::create):
        * runtime/JSInternalPromiseConstructor.h:
        * runtime/JSPromiseConstructor.cpp:
        (JSC::JSPromiseConstructor::create):
        (JSC::JSPromiseConstructor::finishCreation):
        * runtime/JSPromiseConstructor.h:
        * runtime/JSTypedArrayViewConstructor.cpp:
        (JSC::JSTypedArrayViewConstructor::finishCreation):
        (JSC::JSTypedArrayViewConstructor::create): Deleted.
        * runtime/JSTypedArrayViewConstructor.h:
        (JSC::JSTypedArrayViewConstructor::create):
        * runtime/MapConstructor.cpp:
        (JSC::MapConstructor::finishCreation):
        * runtime/MapConstructor.h:
        (JSC::MapConstructor::create):
        * runtime/NumberConstructor.h:
        (JSC::NumberConstructor::create):
        * runtime/RegExpConstructor.cpp:
        (JSC::RegExpConstructor::finishCreation):
        * runtime/RegExpConstructor.h:
        (JSC::RegExpConstructor::create):
        * runtime/SetConstructor.cpp:
        (JSC::SetConstructor::finishCreation):
        * runtime/SetConstructor.h:
        (JSC::SetConstructor::create):
        * runtime/StringConstructor.h:
        (JSC::StringConstructor::create):
        * runtime/SymbolConstructor.h:
        (JSC::SymbolConstructor::create):
        * runtime/WeakMapConstructor.h:
        (JSC::WeakMapConstructor::create):
        * runtime/WeakSetConstructor.h:
        (JSC::WeakSetConstructor::create):
        * tests/stress/symbol-species.js: Added.
        (testSymbolSpeciesOnConstructor):

2016-01-21  Benjamin Poulain  <benjamin@webkit.org>

        [JSC] The IRC allocator can mess up the degree of Tmps interfering with move-related Tmps
        https://bugs.webkit.org/show_bug.cgi?id=153340

        Reviewed by Filip Pizlo.

        The JavaScriptCore tests uncovered an interested bug in the iterated register
        coalescing allocator. When coalescing a move under the right conditions, it is
        possible to mess-up the graph for the Tmps interfering with the coalesced Tmps.

        Some context first:
        -When coalescing a move, we alias one Tmp to another. Let say that we had
             Move X, Y
         the coalescing may alias Y to X: Y->X.
        -Since X and Y are equivalent after coalescing, any interference
         edge with Y is "moved" to X.
         The way this was done was to add an edge to X for every edge there was with Y.
         Say we had an edge R--Y, we add an edge R--X.
         Adding an edge increases the degree of R and Y. The degree of R was then
         fixed by calling decrementDegree() on it.
        -decrementDegree() is non trivial. It will move the Tmp to the right list
         for further processing if the Tmp's degree becomes lower than the number
         of available registers.

        The bug appear in a particular case. Say we have 3 Tmp, A, B, and C.
        -A and B are move related, they can be coalesced.
        -A has an interference edge with C.
        -B does not have and interfence edge with C.
        -C's degree is exactly the number of avaialble registers/colors minus one (k - 1).
         -> This implies C is already in its list.

        We coalesce A and B into B (A->B).
        -The first step, addEdgeDistinct() adds an edge between B and C. The degrees of
         B and C are increased by one. The degree of C becomes k.
        -Next, decrementDegree() is called on C. Its degree decreases to k-1.
         Because of the change from k to k-1, decrementDegree() adds C to a list again.

        We have two kinds of bugs depending on the test:
        -A Tmp can be added to the simplifyWorklist several time.
        -A Tmp can be in both simplifyWorklist and freezeWorklist (because its move-related
         status changed since the last decrementDegree()).
        In both cases, the Tmps interfering with the duplicated Tmp will end up with
        a degree lower than their real value.

        * b3/air/AirIteratedRegisterCoalescing.cpp:

2016-01-21  Andreas Kling  <akling@apple.com>

        Add some missing WTF_MAKE_FAST_ALLOCATED in JavaScriptCore.
        <https://webkit.org/b/153335>

        Reviewed by Alex Christensen.

        Saw these things getting system malloc()'ed in an Instruments trace.

        * inspector/InspectorAgentBase.h:
        * jit/CallFrameShuffleData.h:
        * jit/CallFrameShuffler.h:
        * jit/RegisterAtOffsetList.h:
        * runtime/GenericOffset.h:

2016-01-21  Yusuke Suzuki  <utatane.tea@gmail.com>

        [ES6] Catch parameter should accept BindingPattern
        https://bugs.webkit.org/show_bug.cgi?id=152385

        Reviewed by Saam Barati.

        This patch implements destructuring in catch parameter.
        Catch parameter accepts binding pattern and binding identifier.
        It creates lexical bindings. And "yield" and "let" are specially
        handled as is the same to function parameters.

        In addition to that, we make destructuring parsing errors more descriptive.

        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitPushCatchScope):
        * bytecompiler/BytecodeGenerator.h:
        * bytecompiler/NodesCodegen.cpp:
        (JSC::TryNode::emitBytecode):
        * parser/ASTBuilder.h:
        (JSC::ASTBuilder::createTryStatement):
        * parser/NodeConstructors.h:
        (JSC::TryNode::TryNode):
        * parser/Nodes.h:
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::createBindingPattern):
        (JSC::Parser<LexerType>::tryParseDestructuringPatternExpression):
        (JSC::Parser<LexerType>::parseBindingOrAssignmentElement):
        (JSC::destructuringKindToVariableKindName):
        (JSC::Parser<LexerType>::parseDestructuringPattern):
        (JSC::Parser<LexerType>::parseTryStatement):
        (JSC::Parser<LexerType>::parseFormalParameters):
        (JSC::Parser<LexerType>::parseFunctionParameters):
        * parser/Parser.h:
        (JSC::Parser::destructuringKindFromDeclarationType):
        * parser/SyntaxChecker.h:
        (JSC::SyntaxChecker::createTryStatement):
        * tests/es6.yaml:
        * tests/es6/destructuring_in_catch_heads.js: Added.
        (test):
        * tests/stress/catch-parameter-destructuring.js: Added.
        (shouldBe):
        (shouldThrow):
        (prototype.call):
        (catch):
        (shouldThrow.try.throw.get error):
        (initialize):
        (array):
        (generator.gen):
        (generator):
        * tests/stress/catch-parameter-syntax.js: Added.
        (testSyntax):
        (testSyntaxError):
        * tests/stress/reserved-word-with-escape.js:
        (testSyntaxError.String.raw.a):
        (String.raw.SyntaxError.Cannot.use.the.keyword.string_appeared_here.as.a.name):
        * tests/stress/yield-named-variable.js:

2016-01-21  Filip Pizlo  <fpizlo@apple.com>

        Unreviewed, fix build.

        * b3/B3EliminateCommonSubexpressions.cpp:

2016-01-21  Filip Pizlo  <fpizlo@apple.com>

        B3 CSE should be able to match a full redundancy even if none of the matches dominate the value in question
        https://bugs.webkit.org/show_bug.cgi?id=153321

        Reviewed by Benjamin Poulain.

        I once learned that LLVM's GVN can manufacture Phi functions. I don't know the details
        but I'm presuming that it involves:

            if (p)
                tmp1 = *ptr
            else
                tmp2 = *ptr
            tmp3 = *ptr // Replace this with Phi(tmp1, tmp2).

        This adds such an optimization to our CSE. The idea is that we search through basic
        blocks until we find the value we want, a side effect, or the start of the procedure. If
        we find a value that matches our search criteria, we record it and ignore the
        predecessors. If we find a side effect or the start of the procedure, we give up the
        whole search. This ensures that if we come out of the search without giving up, we'll
        have a set of matches that are fully redundant.

        CSE could then create a Phi graph by using SSACalculator. But the recent work on FixSSA
        revealed a much more exciting option: create a stack slot! In case there is more than one
        match, CSE now creates a stack slot that each match stores to, and replaces the redundant
        instruction with a loadfrom the stack slot. The stack slot is anonymous, which ensures
        that FixSSA will turn it into an optimal Phi graph or whatever.

        This is a significant speed-up on Octane/richards.

        * b3/B3DuplicateTails.cpp:
        * b3/B3EliminateCommonSubexpressions.cpp:
        * b3/B3FixSSA.cpp:
        (JSC::B3::fixSSA):
        * b3/B3Generate.cpp:
        (JSC::B3::generateToAir):
        * b3/B3Procedure.h:
        (JSC::B3::Procedure::setFrontendData):
        (JSC::B3::Procedure::frontendData):
        * b3/testb3.cpp:
        * ftl/FTLState.cpp:
        (JSC::FTL::State::State):

2016-01-21  Filip Pizlo  <fpizlo@apple.com>

        Air should know that CeilDouble has the partial register stall issue
        https://bugs.webkit.org/show_bug.cgi?id=153338

        Rubber stamped by Benjamin Poulain.

        This is a 8% speed-up on Kraken with B3 enabled, mostly because of a 2.4x speed-up on
        audio-oscillator.

        * b3/air/AirFixPartialRegisterStalls.cpp:

2016-01-21  Andy VanWagoner  <andy@instructure.com>

        [INTL] Implement Array.prototype.toLocaleString in ECMA-402
        https://bugs.webkit.org/show_bug.cgi?id=147614

        Reviewed by Benjamin Poulain.

        The primary changes in the ECMA-402 version, and the existing implementation
        are passing the arguments on to each element's toLocaleString call, and
        missing/undefined/null elements become empty string instead of being skipped.

        * runtime/ArrayPrototype.cpp:
        (JSC::arrayProtoFuncToLocaleString):

2016-01-21  Per Arne Vollan  <peavo@outlook.com>

        [B3][Win64] Compile fixes.
        https://bugs.webkit.org/show_bug.cgi?id=153312

        Reviewed by Alex Christensen.

        Since MSVC has several overloads of sin, cos, pow, and log, we need to specify
        which one we want to use.

        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::doubleSin):
        (JSC::FTL::Output::doubleCos):
        (JSC::FTL::Output::doublePow):
        (JSC::FTL::Output::doubleLog):

2016-01-21  Benjamin Poulain  <benjamin@webkit.org>

        [JSC] foldPathConstants() makes invalid assumptions with Switch
        https://bugs.webkit.org/show_bug.cgi?id=153324

        Reviewed by Filip Pizlo.

        If a Switch() has two cases pointing to the same basic block, foldPathConstants()
        was adding two override for that block with two different constants.
        If the block with the Switch dominates the target, both override were equally valid
        and we were assuming any of the constants as the value in the target block.

        See testSwitchTargettingSameBlockFoldPathConstant() for an example that breaks.

        This patch adds checks to ignore any block that is reached more than
        once by the control value.

        * b3/B3FoldPathConstants.cpp:
        * b3/B3Generate.cpp:
        (JSC::B3::generateToAir):
        * b3/testb3.cpp:
        (JSC::B3::testSwitchTargettingSameBlock):
        (JSC::B3::testSwitchTargettingSameBlockFoldPathConstant):
        (JSC::B3::run):

2016-01-21  Filip Pizlo  <fpizlo@apple.com>

        Unreviewed, undo DFGCommon.h change that accidentally enabled the B3 JIT.

        * dfg/DFGCommon.h:

2016-01-21  Filip Pizlo  <fpizlo@apple.com>

        Move32 should have an Imm, Tmp form
        https://bugs.webkit.org/show_bug.cgi?id=153313

        Reviewed by Mark Lam.

        This enables some useful optimizations, like constant propagation in fixObviousSpills().

        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::zeroExtend32ToPtr):
        (JSC::MacroAssemblerX86Common::move):
        * b3/air/AirOpcode.opcodes:

2016-01-21  Filip Pizlo  <fpizlo@apple.com>

        B3 should have load elimination
        https://bugs.webkit.org/show_bug.cgi?id=153288

        Reviewed by Geoffrey Garen.

        This adds a complete GCSE pass that includes load elimination. It would have been super hard
        to make this work as part of the reduceStrength() fixpoint, since GCSE needs to analyze
        control flow and reduceStrength() is messing with control flow. So, I did a compromise: I
        factored out the pure CSE that reduceStrength() was already doing, and now we have:

        - reduceStrength() still does pure CSE using the new PureCSE helper.

        - eliminateCommonSubexpressions() is a separate phase that does general CSE. It uses the
          PureCSE helper for pure values and does its own special thing for memory values.
        
        Unfortunately, this doesn't help any benchmark right now. It doesn't hurt anything, either,
        and it's likely to become a bigger pay-off once we implement other features, like mapping
        FTL's abstract heaps onto B3's heap ranges.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/B3EliminateCommonSubexpressions.cpp: Added.
        (JSC::B3::eliminateCommonSubexpressions):
        * b3/B3EliminateCommonSubexpressions.h: Added.
        * b3/B3Generate.cpp:
        (JSC::B3::generateToAir):
        * b3/B3HeapRange.h:
        (JSC::B3::HeapRange::HeapRange):
        * b3/B3InsertionSet.h:
        (JSC::B3::InsertionSet::InsertionSet):
        (JSC::B3::InsertionSet::isEmpty):
        (JSC::B3::InsertionSet::code):
        (JSC::B3::InsertionSet::appendInsertion):
        * b3/B3MemoryValue.h:
        * b3/B3PureCSE.cpp: Added.
        (JSC::B3::PureCSE::PureCSE):
        (JSC::B3::PureCSE::~PureCSE):
        (JSC::B3::PureCSE::clear):
        (JSC::B3::PureCSE::process):
        * b3/B3PureCSE.h: Added.
        * b3/B3ReduceStrength.cpp:
        * b3/B3ReduceStrength.h:
        * b3/B3Validate.cpp:

2016-01-21  Keith Miller  <keith_miller@apple.com>

        Fix bug in TypedArray.prototype.set and add tests
        https://bugs.webkit.org/show_bug.cgi?id=153309

        Reviewed by Michael Saboff.

        This patch fixes an issue with TypedArray.prototype.set where we would
        assign a double to an unsigned without checking that the double was
        in the range of the unsigned. Additionally, the patch also adds
        tests for set for cases that were not covered before.

        * runtime/JSGenericTypedArrayViewPrototypeFunctions.h:
        (JSC::genericTypedArrayViewProtoFuncSet):
        * tests/stress/typedarray-set.js: Added.

2016-01-19  Ada Chan  <adachan@apple.com>

        Make it possible to enable VIDEO_PRESENTATION_MODE on other Cocoa platforms.
        https://bugs.webkit.org/show_bug.cgi?id=153218

        Reviewed by Eric Carlson.

        * Configurations/FeatureDefines.xcconfig:

2016-01-21  Per Arne Vollan  <peavo@outlook.com>

        [B3][CMake] Add missing source file.
        https://bugs.webkit.org/show_bug.cgi?id=153303

        Reviewed by Csaba Osztrogonác.

        * CMakeLists.txt:

2016-01-20  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r195375.
        https://bugs.webkit.org/show_bug.cgi?id=153300

        Caused crashes on GuardMalloc (Requested by ap on #webkit).

        Reverted changeset:

        "TypedArray's .buffer does not return the JSArrayBuffer that
        was passed to it on creation."
        https://bugs.webkit.org/show_bug.cgi?id=153281
        http://trac.webkit.org/changeset/195375

2016-01-19  Filip Pizlo  <fpizlo@apple.com>

        B3 should have basic path specialization
        https://bugs.webkit.org/show_bug.cgi?id=153200

        Reviewed by Benjamin Poulain.

        This adds two different kind of path specializations:

        - Check(Select) where the Select results are constants is specialized into a Branch
          instead of a Select and duplicated paths where the results of the Select are folded.

        - Tail duplication. A jump to a small block causes the block's contents to be copied over
          the Jump.

        Both optimizations required being able to clone Values. We can now do that using
        proc.clone(value).

        Check(Select) specialization needed some utilities for walking graphs of Values.

        Tail duplication needed SSA fixup, so I added a way to demote values to anonymous stack
        slots (B3's equivalent of non-SSA variables) and a way to "fix SSA", i.e. to allocate
        anonymous stack slots to SSA values along with an optimal Phi graph.

        This is a big speed-up on Octane/deltablue. It's a 2.2% speed-up on Octane overall.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/B3ArgumentRegValue.cpp:
        (JSC::B3::ArgumentRegValue::dumpMeta):
        (JSC::B3::ArgumentRegValue::cloneImpl):
        * b3/B3ArgumentRegValue.h:
        * b3/B3BasicBlock.cpp:
        (JSC::B3::BasicBlock::append):
        (JSC::B3::BasicBlock::appendNonTerminal):
        (JSC::B3::BasicBlock::removeLast):
        * b3/B3BasicBlock.h:
        (JSC::B3::BasicBlock::values):
        * b3/B3BasicBlockInlines.h:
        (JSC::B3::BasicBlock::appendNew):
        (JSC::B3::BasicBlock::appendNewNonTerminal):
        (JSC::B3::BasicBlock::replaceLastWithNew):
        * b3/B3BlockInsertionSet.h:
        * b3/B3BreakCriticalEdges.cpp: Added.
        (JSC::B3::breakCriticalEdges):
        * b3/B3BreakCriticalEdges.h: Added.
        * b3/B3CCallValue.cpp:
        (JSC::B3::CCallValue::~CCallValue):
        (JSC::B3::CCallValue::cloneImpl):
        * b3/B3CCallValue.h:
        * b3/B3CheckValue.cpp:
        (JSC::B3::CheckValue::convertToAdd):
        (JSC::B3::CheckValue::cloneImpl):
        (JSC::B3::CheckValue::CheckValue):
        * b3/B3CheckValue.h:
        * b3/B3Const32Value.cpp:
        (JSC::B3::Const32Value::dumpMeta):
        (JSC::B3::Const32Value::cloneImpl):
        * b3/B3Const32Value.h:
        * b3/B3Const64Value.cpp:
        (JSC::B3::Const64Value::dumpMeta):
        (JSC::B3::Const64Value::cloneImpl):
        * b3/B3Const64Value.h:
        * b3/B3ConstDoubleValue.cpp:
        (JSC::B3::ConstDoubleValue::dumpMeta):
        (JSC::B3::ConstDoubleValue::cloneImpl):
        * b3/B3ConstDoubleValue.h:
        * b3/B3ConstFloatValue.cpp:
        (JSC::B3::ConstFloatValue::dumpMeta):
        (JSC::B3::ConstFloatValue::cloneImpl):
        * b3/B3ConstFloatValue.h:
        * b3/B3ControlValue.cpp:
        (JSC::B3::ControlValue::dumpMeta):
        (JSC::B3::ControlValue::cloneImpl):
        * b3/B3ControlValue.h:
        * b3/B3DuplicateTails.cpp: Added.
        (JSC::B3::duplicateTails):
        * b3/B3DuplicateTails.h: Added.
        * b3/B3FixSSA.cpp: Added.
        (JSC::B3::demoteValues):
        (JSC::B3::fixSSA):
        * b3/B3FixSSA.h: Added.
        * b3/B3Generate.cpp:
        (JSC::B3::generateToAir):
        * b3/B3IndexSet.h:
        (JSC::B3::IndexSet::Iterable::Iterable):
        (JSC::B3::IndexSet::values):
        (JSC::B3::IndexSet::indices):
        * b3/B3InsertionSet.cpp:
        (JSC::B3::InsertionSet::insertIntConstant):
        (JSC::B3::InsertionSet::insertBottom):
        (JSC::B3::InsertionSet::execute):
        * b3/B3InsertionSet.h:
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::run):
        (JSC::B3::Air::LowerToAir::tmp):
        * b3/B3MemoryValue.cpp:
        (JSC::B3::MemoryValue::dumpMeta):
        (JSC::B3::MemoryValue::cloneImpl):
        * b3/B3MemoryValue.h:
        * b3/B3OriginDump.cpp: Added.
        (JSC::B3::OriginDump::dump):
        * b3/B3OriginDump.h:
        (JSC::B3::OriginDump::OriginDump):
        (JSC::B3::OriginDump::dump): Deleted.
        * b3/B3PatchpointValue.cpp:
        (JSC::B3::PatchpointValue::dumpMeta):
        (JSC::B3::PatchpointValue::cloneImpl):
        (JSC::B3::PatchpointValue::PatchpointValue):
        * b3/B3PatchpointValue.h:
        * b3/B3Procedure.cpp:
        (JSC::B3::Procedure::addBlock):
        (JSC::B3::Procedure::clone):
        (JSC::B3::Procedure::addIntConstant):
        (JSC::B3::Procedure::addBottom):
        (JSC::B3::Procedure::addBoolConstant):
        (JSC::B3::Procedure::deleteValue):
        * b3/B3Procedure.h:
        * b3/B3ReduceStrength.cpp:
        * b3/B3SSACalculator.cpp: Added.
        (JSC::B3::SSACalculator::Variable::dump):
        (JSC::B3::SSACalculator::Variable::dumpVerbose):
        (JSC::B3::SSACalculator::Def::dump):
        (JSC::B3::SSACalculator::SSACalculator):
        (JSC::B3::SSACalculator::~SSACalculator):
        (JSC::B3::SSACalculator::reset):
        (JSC::B3::SSACalculator::newVariable):
        (JSC::B3::SSACalculator::newDef):
        (JSC::B3::SSACalculator::nonLocalReachingDef):
        (JSC::B3::SSACalculator::reachingDefAtTail):
        (JSC::B3::SSACalculator::dump):
        * b3/B3SSACalculator.h: Added.
        (JSC::B3::SSACalculator::Variable::index):
        (JSC::B3::SSACalculator::Variable::Variable):
        (JSC::B3::SSACalculator::Def::variable):
        (JSC::B3::SSACalculator::Def::block):
        (JSC::B3::SSACalculator::Def::value):
        (JSC::B3::SSACalculator::Def::Def):
        (JSC::B3::SSACalculator::variable):
        (JSC::B3::SSACalculator::computePhis):
        (JSC::B3::SSACalculator::phisForBlock):
        (JSC::B3::SSACalculator::reachingDefAtHead):
        * b3/B3StackSlotKind.h:
        * b3/B3StackSlotValue.cpp:
        (JSC::B3::StackSlotValue::dumpMeta):
        (JSC::B3::StackSlotValue::cloneImpl):
        * b3/B3StackSlotValue.h:
        * b3/B3SwitchValue.cpp:
        (JSC::B3::SwitchValue::dumpMeta):
        (JSC::B3::SwitchValue::cloneImpl):
        (JSC::B3::SwitchValue::SwitchValue):
        * b3/B3SwitchValue.h:
        * b3/B3UpsilonValue.cpp:
        (JSC::B3::UpsilonValue::dumpMeta):
        (JSC::B3::UpsilonValue::cloneImpl):
        * b3/B3UpsilonValue.h:
        * b3/B3Validate.cpp:
        * b3/B3Value.cpp:
        (JSC::B3::Value::replaceWithNop):
        (JSC::B3::Value::replaceWithPhi):
        (JSC::B3::Value::dump):
        (JSC::B3::Value::cloneImpl):
        (JSC::B3::Value::dumpChildren):
        (JSC::B3::Value::deepDump):
        * b3/B3Value.h:
        (JSC::B3::DeepValueDump::DeepValueDump):
        (JSC::B3::DeepValueDump::dump):
        (JSC::B3::deepDump):
        * b3/B3ValueInlines.h:
        (JSC::B3::Value::asNumber):
        (JSC::B3::Value::walk):
        * b3/B3ValueKey.cpp:
        (JSC::B3::ValueKey::intConstant):
        (JSC::B3::ValueKey::dump):
        * b3/B3ValueKey.h:
        (JSC::B3::ValueKey::ValueKey):
        (JSC::B3::ValueKey::opcode):
        (JSC::B3::ValueKey::type):
        (JSC::B3::ValueKey::childIndex):
        * b3/air/AirCode.h:
        (JSC::B3::Air::Code::forAllTmps):
        (JSC::B3::Air::Code::isFastTmp):
        * b3/air/AirIteratedRegisterCoalescing.cpp:
        * b3/air/AirUseCounts.h:
        (JSC::B3::Air::UseCounts::UseCounts):
        (JSC::B3::Air::UseCounts::operator[]):
        (JSC::B3::Air::UseCounts::dump):
        * b3/testb3.cpp:
        (JSC::B3::testSelectInvert):
        (JSC::B3::testCheckSelect):
        (JSC::B3::testCheckSelectCheckSelect):
        (JSC::B3::testPowDoubleByIntegerLoop):
        (JSC::B3::run):
        * runtime/Options.h:

2016-01-20  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Fix a typo in the Air definition of CeilDouble/CeilFloat
        https://bugs.webkit.org/show_bug.cgi?id=153286

        Reviewed by Mark Lam.

        * b3/air/AirOpcode.opcodes:
        The second argument should a Def. The previous definition was
        adding useless constraints on the allocation of the second argument.

2016-01-20  Benjamin Poulain  <benjamin@webkit.org>

        [JSC] The register allocator can use a dangling pointer when selecting a spill candidate
        https://bugs.webkit.org/show_bug.cgi?id=153287

        Reviewed by Mark Lam.

        A tricky bug I discovered while experimenting with live range breaking.

        We have the following initial conditions:
        -UseCounts is slow, so we only compute it once for all the iterations
         of the allocator.
        -The only new Tmps we create are for spills and refills. They are unspillable
         by definition so it is fine to not update UseCounts accordingly.

        But, in selectSpill(), we go over all the spill candidates and select the best
        one based on its score. The score() lambda uses useCounts, it cannot be used
        with a new Tmps created for something we already spilled.

        The first time we use score is correct, we started by skipping all the unspillable
        Tmps from the candidate. The next use was incorrect: we were checking unspillableTmps
        *after* calling score().

        The existing tests did not catch this due to back luck. I added an assertion
        to find similar problems in the future.

        * b3/air/AirIteratedRegisterCoalescing.cpp:
        * b3/air/AirUseCounts.h:

2016-01-20  Saam barati  <sbarati@apple.com>

        Fix CLoop build after bug https://bugs.webkit.org/show_bug.cgi?id=152766

        Unreviewed build fix.

        * inspector/agents/InspectorScriptProfilerAgent.h:

2016-01-20  Andy VanWagoner  <thetalecrafter@gmail.com>

        [INTL] Implement Date.prototype.toLocaleTimeString in ECMA-402
        https://bugs.webkit.org/show_bug.cgi?id=147613

        Reviewed by Darin Adler.

        Implement toLocaleTimeString in builtin JavaScript.

        * builtins/DatePrototype.js:
        (toLocaleTimeString.toDateTimeOptionsTimeTime):
        (toLocaleTimeString):
        * runtime/DatePrototype.cpp:
        (JSC::DatePrototype::finishCreation):

2016-01-20  Saam barati  <sbarati@apple.com>

        Web Inspector: Hook the sampling profiler into the Timelines UI
        https://bugs.webkit.org/show_bug.cgi?id=152766
        <rdar://problem/24066360>

        Reviewed by Joseph Pecoraro.

        This patch adds some necessary functions to SamplingProfiler::StackFrame
        to allow it to give data to the Inspector for the timelines UI. i.e, the
        sourceID of the executable of a stack frame.

        This patch also swaps in the SamplingProfiler in place of the
        LegacyProfiler inside InspectorScriptProfilerAgent. It adds
        the necessary protocol data to allow the SamplingProfiler's
        data to hook into the timelines UI.

        * debugger/Debugger.cpp:
        (JSC::Debugger::setProfilingClient):
        (JSC::Debugger::willEvaluateScript):
        (JSC::Debugger::didEvaluateScript):
        (JSC::Debugger::toggleBreakpoint):
        * debugger/Debugger.h:
        * debugger/ScriptProfilingScope.h:
        (JSC::ScriptProfilingScope::ScriptProfilingScope):
        (JSC::ScriptProfilingScope::~ScriptProfilingScope):
        * inspector/agents/InspectorScriptProfilerAgent.cpp:
        (Inspector::InspectorScriptProfilerAgent::willDestroyFrontendAndBackend):
        (Inspector::InspectorScriptProfilerAgent::startTracking):
        (Inspector::InspectorScriptProfilerAgent::stopTracking):
        (Inspector::InspectorScriptProfilerAgent::isAlreadyProfiling):
        (Inspector::InspectorScriptProfilerAgent::willEvaluateScript):
        (Inspector::InspectorScriptProfilerAgent::didEvaluateScript):
        (Inspector::InspectorScriptProfilerAgent::addEvent):
        (Inspector::buildSamples):
        (Inspector::InspectorScriptProfilerAgent::trackingComplete):
        (Inspector::buildAggregateCallInfoInspectorObject): Deleted.
        (Inspector::buildInspectorObject): Deleted.
        (Inspector::buildProfileInspectorObject): Deleted.
        * inspector/agents/InspectorScriptProfilerAgent.h:
        * inspector/protocol/ScriptProfiler.json:
        * jsc.cpp:
        (functionSamplingProfilerStackTraces):
        * runtime/SamplingProfiler.cpp:
        (JSC::SamplingProfiler::start):
        (JSC::SamplingProfiler::stop):
        (JSC::SamplingProfiler::clearData):
        (JSC::SamplingProfiler::StackFrame::displayName):
        (JSC::SamplingProfiler::StackFrame::displayNameForJSONTests):
        (JSC::SamplingProfiler::StackFrame::startLine):
        (JSC::SamplingProfiler::StackFrame::startColumn):
        (JSC::SamplingProfiler::StackFrame::sourceID):
        (JSC::SamplingProfiler::StackFrame::url):
        (JSC::SamplingProfiler::stackTraces):
        (JSC::SamplingProfiler::stackTracesAsJSON):
        (JSC::displayName): Deleted.
        (JSC::SamplingProfiler::stacktracesAsJSON): Deleted.
        * runtime/SamplingProfiler.h:
        (JSC::SamplingProfiler::StackFrame::StackFrame):
        (JSC::SamplingProfiler::getLock):
        (JSC::SamplingProfiler::setTimingInterval):
        (JSC::SamplingProfiler::totalTime):
        (JSC::SamplingProfiler::setStopWatch):
        (JSC::SamplingProfiler::stackTraces): Deleted.
        * tests/stress/sampling-profiler-anonymous-function.js:
        (platformSupportsSamplingProfiler.baz):
        (platformSupportsSamplingProfiler):
        * tests/stress/sampling-profiler-basic.js:
        (platformSupportsSamplingProfiler.nothing):
        (platformSupportsSamplingProfiler.top):
        * tests/stress/sampling-profiler/samplingProfiler.js:
        (doesTreeHaveStackTrace):

2016-01-20  Keith Miller  <keith_miller@apple.com>

        TypedArray's .buffer does not return the JSArrayBuffer that was passed to it on creation.
        https://bugs.webkit.org/show_bug.cgi?id=153281

        Reviewed by Geoffrey Garen.

        When creating an JSArrayBuffer we should make sure that the backing ArrayBuffer uses the
        new JSArrayBuffer as its wrapper. This causes issues when we get the buffer of a Typed Array
        created by passing a JSArrayBuffer as the backing ArrayBuffer does not have a reference to
        the original JSArrayBuffer and a new object is created.

        * runtime/JSArrayBuffer.cpp:
        (JSC::JSArrayBuffer::finishCreation):
        * tests/stress/typedarray-buffer-neutered.js: Added.
        (arrays.typedArrays.map):

2016-01-20  Andreas Kling  <akling@apple.com>

        Pack RegisterAtOffset harder.
        <https://webkit.org/b/152501>

        Reviewed by Michael Saboff.

        Pack the register index and the offset into a single pointer-sized word instead of two.
        This reduces memory consumption by 620 kB on mobile theverge.com.

        The packing doesn't succeed on MSVC for some reason, so I've left out the static
        assertion about class size in those builds.

        * jit/RegisterAtOffset.cpp:
        * jit/RegisterAtOffset.h:

2016-01-20  Per Arne Vollan  <peavo@outlook.com>

        [B3][Win64] Compile fix.
        https://bugs.webkit.org/show_bug.cgi?id=153278

        Reviewed by Filip Pizlo.

        MSVC does not accept that a class declared as exported also have members declared as exported.

        * b3/B3Const32Value.h:
        * b3/B3ControlValue.h:

2016-01-19  Keith Miller  <keith_miller@apple.com>

        [ES6] Fix various issues with TypedArrays.
        https://bugs.webkit.org/show_bug.cgi?id=153245

        Reviewed by Geoffrey Garen.

        This patch fixes a couple of issues with TypedArrays:

        1) We were not checking if a view had been neutered and throwing an error
        if it had in the our TypedArray.prototype functions.

        2) The TypedArray.prototype.set function had a couple of minor issues with
        checking for the offset being negative.

        3) The JSArrayBufferView class did not check if the backing store had
        been neutered when computing the offset even though the view's vector
        pointer had been set to NULL. This meant that under some conditions we
        could, occasionally, return a garbage number as the offset. Now, we only
        neuter views if the backing ArrayBuffer's view is actually transfered.

        * jsc.cpp:
        (GlobalObject::finishCreation):
        (functionNeuterTypedArray):
        * runtime/JSArrayBufferView.h:
        (JSC::JSArrayBufferView::isNeutered):
        * runtime/JSArrayBufferViewInlines.h:
        (JSC::JSArrayBufferView::byteOffset):
        * runtime/JSGenericTypedArrayViewPrototypeFunctions.h:
        (JSC::genericTypedArrayViewProtoFuncSet):
        (JSC::genericTypedArrayViewProtoFuncEntries):
        (JSC::genericTypedArrayViewProtoFuncCopyWithin):
        (JSC::genericTypedArrayViewProtoFuncFill):
        (JSC::genericTypedArrayViewProtoFuncIndexOf):
        (JSC::genericTypedArrayViewProtoFuncJoin):
        (JSC::genericTypedArrayViewProtoFuncKeys):
        (JSC::genericTypedArrayViewProtoFuncLastIndexOf):
        (JSC::genericTypedArrayViewProtoFuncReverse):
        (JSC::genericTypedArrayViewPrivateFuncSort):
        (JSC::genericTypedArrayViewProtoFuncSlice):
        (JSC::genericTypedArrayViewProtoFuncSubarray):
        (JSC::typedArrayViewProtoFuncValues):
        * runtime/JSTypedArrayViewPrototype.cpp:
        (JSC::typedArrayViewPrivateFuncLength):
        (JSC::typedArrayViewPrivateFuncSort): Deleted.
        * tests/stress/typedarray-functions-with-neutered.js: Added.
        (getGetter):
        (unit):
        (args.new.Int32Array):
        (arrays.typedArrays.map):
        (checkProtoFunc.throwsCorrectError):
        (checkProtoFunc):
        (test):

2016-01-19  Andy VanWagoner  <thetalecrafter@gmail.com>

        [INTL] Implement Date.prototype.toLocaleDateString in ECMA-402
        https://bugs.webkit.org/show_bug.cgi?id=147612

        Reviewed by Benjamin Poulain.

        Implement toLocaleDateString in builtin JavaScript. Remove comments with
        spec steps, and instead link to the new HTML version of the spec.

        Avoids creating an extra empty object in the prototype chain of the options
        object in ToDateTimeOptions. The version used in toLocaleString was updated
        to match as well.

        * builtins/DatePrototype.js:
        (toLocaleString.toDateTimeOptionsAnyAll):
        (toLocaleString):
        (toLocaleDateString.toDateTimeOptionsDateDate):
        (toLocaleDateString):
        * runtime/DatePrototype.cpp:
        (JSC::DatePrototype::finishCreation):

2016-01-19  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] fixSpillSlotZDef() crashes on ARM64
        https://bugs.webkit.org/show_bug.cgi?id=153246

        Reviewed by Geoffrey Garen.

        Moving an immediate to memory is not a valid instruction on ARM64.
        This patch adds a small workaround for this specific case: an instruction
        to zero a chunk of memory.

        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::storeZero32):
        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::storeZero32):
        * b3/air/AirFixSpillSlotZDef.h:
        (JSC::B3::Air::fixSpillSlotZDef):
        * b3/air/AirOpcode.opcodes:

2016-01-19  Enrica Casucci  <enrica@apple.com>

        Add support for DataDetectors in WK (iOS).
        https://bugs.webkit.org/show_bug.cgi?id=152989
        rdar://problem/22855960

        Reviewed by Tim Horton.

        Adding feature definition for data detection.

        * Configurations/FeatureDefines.xcconfig:

2016-01-19  Per Arne Vollan  <peavo@outlook.com>

        [B3][Win64] Compile and warning fixes.
        https://bugs.webkit.org/show_bug.cgi?id=153234

        Reviewed by Alex Christensen.

        The size of 'long' is 4 bytes on Win64. We can use 'long long' instead,
        when we want the size to be 8 bytes.

        * b3/B3LowerMacrosAfterOptimizations.cpp:
        * b3/B3ReduceStrength.cpp:

2016-01-19  Csaba Osztrogonác  <ossy@webkit.org>

        [cmake] Fix the B3 build after r195159
        https://bugs.webkit.org/show_bug.cgi?id=153232

        Reviewed by Yusuke Suzuki.

        * CMakeLists.txt:

2016-01-19  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r195300.
        https://bugs.webkit.org/show_bug.cgi?id=153244

        enrica wants more time to fix Windows (Requested by thorton on
        #webkit).

        Reverted changeset:

        "Add support for DataDetectors in WK (iOS)."
        https://bugs.webkit.org/show_bug.cgi?id=152989
        http://trac.webkit.org/changeset/195300

2016-01-19  Filip Pizlo  <fpizlo@apple.com>

        Reconsider B3's constant motion policy
        https://bugs.webkit.org/show_bug.cgi?id=152202

        Reviewed by Geoffrey Garen.

        This changes moveConstants() to hoist constants. This is a speed-up on things like mandreel.
        It has a generally positive impact on the Octane score, but it's within margin of error.

        This also changes IRC to make it a bit more likely to spill constants. We don't want it to
        spill them too much, because we can't rely on fixObviousSpills() to always replace a load of
        a constant from the stack with the constant itself, especially in case of instructions that
        need an extra register to materialize the immediate.

        Also fixed DFG graph dumping to print a bit less things. It was trying to print the results of
        constant property inference, and this sometimes caused crashes when you dumped the graph at an
        inopportune time.

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/B3MoveConstants.cpp:
        * b3/air/AirArg.h:
        * b3/air/AirArgInlines.h: Added.
        (JSC::B3::Air::ArgThingHelper<Tmp>::is):
        (JSC::B3::Air::ArgThingHelper<Tmp>::as):
        (JSC::B3::Air::ArgThingHelper<Tmp>::forEachFast):
        (JSC::B3::Air::ArgThingHelper<Tmp>::forEach):
        (JSC::B3::Air::ArgThingHelper<Arg>::is):
        (JSC::B3::Air::ArgThingHelper<Arg>::as):
        (JSC::B3::Air::ArgThingHelper<Arg>::forEachFast):
        (JSC::B3::Air::ArgThingHelper<Arg>::forEach):
        (JSC::B3::Air::Arg::is):
        (JSC::B3::Air::Arg::as):
        (JSC::B3::Air::Arg::forEachFast):
        (JSC::B3::Air::Arg::forEach):
        * b3/air/AirIteratedRegisterCoalescing.cpp:
        * b3/air/AirUseCounts.h:
        (JSC::B3::Air::UseCounts::UseCounts):
        * dfg/DFGGraph.cpp:
        (JSC::DFG::Graph::dump):

2016-01-19  Enrica Casucci  <enrica@apple.com>

        Add support for DataDetectors in WK (iOS).
        https://bugs.webkit.org/show_bug.cgi?id=152989
        rdar://problem/22855960

        Reviewed by Tim Horton.

        Adding feature definition.

        * Configurations/FeatureDefines.xcconfig:

2016-01-17  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should be just as fast as FTL LLVM on Octane/crypto
        https://bugs.webkit.org/show_bug.cgi?id=153113

        Reviewed by Saam Barati.

        This is the result of a hacking rampage to close the gap between FTL B3 and FTL LLVM on
        Octane/crypto. It was a very successful rampage.

        The biggest change in this patch is the introduction of a phase called fixObviousSpills()
        that fixes patterns like:

        Store register to stack slot and then use stack slot:
            Move %rcx, (stack42)
            Foo use:(stack42) // replace (stack42) with %rcx here.

        Load stack slot into register and then use stack slot:
            Move (stack42), %rcx
            Foo use:(stack42) // replace (stack42) with %rcx here.

        Store constant into stack slot and then use stack slot:
            Move $42, %rcx
            Move %rcx, (stack42)
            Bar def:%rcx // %rcx isn't available anymore, but we still know that (stack42) is $42
            Foo use:(stack42) // replace (stack42) with $42 here.

        This phases does these fixups by doing a global forward flow that propagates sets of
        must-aliases.

        Also added a phase to report register pressure. It pretty-prints code alongside the set of
        in-use registers above each instruction. Using this phase, I found that our register
        allocator is actually doing a pretty awesome job. I had previously feared that we'd have to
        make substantial changes to register allocation. I don't have such a fear anymore, at least
        for Octane/crypto. In the future, we can check how the regalloc is performing just by
        enabling logAirRegisterPressure.

        Also fixed some FTL codegen pathologies. We were using bitOr where we meant to use a
        conditional or. LLVM likes to canonicalize boolean expressions this way. B3, on the other
        hand, doesn't do this canonicalization and doesn't have logic to decompose it into sequences
        of branches.

        Also added strength reductions for checked arithmetic. It turns out that LLVM learned how to
        reduce checked multiply to unchecked multiply in some obvious cases that our existing DFG
        optimizations lacked. Ideally, our DFG integer range optimization phase would cover this. But
        the cases of interest were dead simple - the incoming values to the CheckMul were obviously
        too small to cause overflow. I added such reasoning to B3's strength reduction.

        Finally, this fixes some bugs with how we were handling subwidth spill slots. The register
        allocator was making two mistakes. First, it might cause a Width64 def or use of a 4-byte
        spill slot. In that case, it would extend the size of the spill slot to ensure that the use
        or def is safe. Second, it emulates ZDef on Tmp behavior by emitting a Move32 to initialize
        the high bits of a spill slot. But this is unsound because of the liveness semantics of spill
        slots. They cannot have more than one def to initialize their value. I fixed that by making
        allocateStack() be the thing that fixes ZDefs. That's a change to ZDef semantics: now, ZDef
        on an anonymous stack slot means that the high bits are zero-filled. I wasn't able to
        construct a test for this. It might be a hypothetical bug, but still, I like how this
        simplifies the register allocator.

        This is a ~0.7% speed-up on Octane.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/B3CheckSpecial.cpp:
        (JSC::B3::CheckSpecial::hiddenBranch):
        (JSC::B3::CheckSpecial::forEachArg):
        (JSC::B3::CheckSpecial::commitHiddenBranch): Deleted.
        * b3/B3CheckSpecial.h:
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::fillStackmap):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3StackmapValue.h:
        * b3/air/AirAllocateStack.cpp:
        (JSC::B3::Air::allocateStack):
        * b3/air/AirAllocateStack.h:
        * b3/air/AirArg.h:
        (JSC::B3::Air::Arg::callArg):
        (JSC::B3::Air::Arg::stackAddr):
        (JSC::B3::Air::Arg::isValidScale):
        * b3/air/AirBasicBlock.cpp:
        (JSC::B3::Air::BasicBlock::deepDump):
        (JSC::B3::Air::BasicBlock::dumpHeader):
        (JSC::B3::Air::BasicBlock::dumpFooter):
        * b3/air/AirBasicBlock.h:
        * b3/air/AirCCallSpecial.cpp:
        (JSC::B3::Air::CCallSpecial::CCallSpecial):
        (JSC::B3::Air::CCallSpecial::~CCallSpecial):
        * b3/air/AirCode.h:
        (JSC::B3::Air::Code::lastPhaseName):
        (JSC::B3::Air::Code::setEnableRCRS):
        (JSC::B3::Air::Code::enableRCRS):
        * b3/air/AirCustom.cpp:
        (JSC::B3::Air::PatchCustom::isValidForm):
        (JSC::B3::Air::CCallCustom::isValidForm):
        * b3/air/AirCustom.h:
        (JSC::B3::Air::PatchCustom::isValidFormStatic):
        (JSC::B3::Air::PatchCustom::admitsStack):
        (JSC::B3::Air::PatchCustom::isValidForm): Deleted.
        * b3/air/AirEmitShuffle.cpp:
        (JSC::B3::Air::ShufflePair::dump):
        (JSC::B3::Air::createShuffle):
        (JSC::B3::Air::emitShuffle):
        * b3/air/AirEmitShuffle.h:
        * b3/air/AirFixObviousSpills.cpp: Added.
        (JSC::B3::Air::fixObviousSpills):
        * b3/air/AirFixObviousSpills.h: Added.
        * b3/air/AirFixSpillSlotZDef.h: Removed.
        * b3/air/AirGenerate.cpp:
        (JSC::B3::Air::prepareForGeneration):
        (JSC::B3::Air::generate):
        * b3/air/AirHandleCalleeSaves.cpp:
        (JSC::B3::Air::handleCalleeSaves):
        * b3/air/AirInst.h:
        * b3/air/AirInstInlines.h:
        (JSC::B3::Air::Inst::reportUsedRegisters):
        (JSC::B3::Air::Inst::admitsStack):
        (JSC::B3::Air::isShiftValid):
        * b3/air/AirIteratedRegisterCoalescing.cpp:
        * b3/air/AirLiveness.h:
        (JSC::B3::Air::AbstractLiveness::AbstractLiveness):
        (JSC::B3::Air::AbstractLiveness::LocalCalc::Iterable::begin):
        (JSC::B3::Air::AbstractLiveness::LocalCalc::Iterable::end):
        (JSC::B3::Air::AbstractLiveness::LocalCalc::Iterable::contains):
        (JSC::B3::Air::AbstractLiveness::LocalCalc::live):
        (JSC::B3::Air::AbstractLiveness::LocalCalc::isLive):
        (JSC::B3::Air::AbstractLiveness::LocalCalc::execute):
        (JSC::B3::Air::AbstractLiveness::rawLiveAtHead):
        (JSC::B3::Air::AbstractLiveness::Iterable::begin):
        (JSC::B3::Air::AbstractLiveness::Iterable::end):
        (JSC::B3::Air::AbstractLiveness::Iterable::contains):
        (JSC::B3::Air::AbstractLiveness::liveAtTail):
        (JSC::B3::Air::AbstractLiveness::workset):
        * b3/air/AirLogRegisterPressure.cpp: Added.
        (JSC::B3::Air::logRegisterPressure):
        * b3/air/AirLogRegisterPressure.h: Added.
        * b3/air/AirOptimizeBlockOrder.cpp:
        (JSC::B3::Air::blocksInOptimizedOrder):
        (JSC::B3::Air::optimizeBlockOrder):
        * b3/air/AirOptimizeBlockOrder.h:
        * b3/air/AirReportUsedRegisters.cpp:
        (JSC::B3::Air::reportUsedRegisters):
        * b3/air/AirReportUsedRegisters.h:
        * b3/air/AirSpillEverything.cpp:
        (JSC::B3::Air::spillEverything):
        * b3/air/AirStackSlot.h:
        (JSC::B3::Air::StackSlot::isLocked):
        (JSC::B3::Air::StackSlot::index):
        (JSC::B3::Air::StackSlot::ensureSize):
        (JSC::B3::Air::StackSlot::alignment):
        * b3/air/AirValidate.cpp:
        * ftl/FTLB3Compile.cpp:
        (JSC::FTL::compile):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithMul):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithDiv):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithMod):
        * jit/RegisterSet.h:
        (JSC::RegisterSet::get):
        (JSC::RegisterSet::setAll):
        (JSC::RegisterSet::merge):
        (JSC::RegisterSet::filter):
        * runtime/Options.h:

2016-01-19  Filip Pizlo  <fpizlo@apple.com>

        Unreviewed, undo unintended commit.

        * dfg/DFGCommon.h:

2016-01-18  Filip Pizlo  <fpizlo@apple.com>

        Fix Air shuffling assertions
        https://bugs.webkit.org/show_bug.cgi?id=153213

        Reviewed by Saam Barati.

        Fixes some assertions that I was seeing running JSC tests. Adds a new Air test.

        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::store8):
        (JSC::MacroAssemblerX86Common::getUnusedRegister):
        * b3/air/AirEmitShuffle.cpp:
        (JSC::B3::Air::emitShuffle):
        * b3/air/AirLowerAfterRegAlloc.cpp:
        (JSC::B3::Air::lowerAfterRegAlloc):
        * b3/air/testair.cpp:
        (JSC::B3::Air::testShuffleRotateWithFringe):
        (JSC::B3::Air::testShuffleRotateWithFringeInWeirdOrder):
        (JSC::B3::Air::testShuffleRotateWithLongFringe):
        (JSC::B3::Air::run):

2016-01-19  Konstantin Tokarev  <annulen@yandex.ru>

        [mips] Logical instructions allow immediates in range 0..0xffff, not 0x7fff
        https://bugs.webkit.org/show_bug.cgi?id=152693

        Reviewed by Michael Saboff.

        * offlineasm/mips.rb:

2016-01-18  Saam barati  <sbarati@apple.com>

        assertions in BytecodeUseDef.h about opcode length are off by one
        https://bugs.webkit.org/show_bug.cgi?id=153215

        Reviewed by Dan Bernstein.

        * bytecode/BytecodeUseDef.h:
        (JSC::computeUsesForBytecodeOffset):

2016-01-18  Saam barati  <sbarati@apple.com>

        FTL doesn't do proper spilling for exception handling when GetById/Snippets go to slow path
        https://bugs.webkit.org/show_bug.cgi?id=153186

        Reviewed by Michael Saboff.

        Michael was investigating a bug he found while doing the new JSC calling 
        convention work and it turns out to be a latent bug in FTL try/catch machinery.
        After I looked at the code again, I realized that what I had previously
        written is wrong in a subtle way. The FTL callOperation machinery will remove
        its result register from the set of registers it needs to spill. This is not
        correct when we have try/catch. We may want to do value recovery on
        the value that the result register is prior to the call after the call
        throws an exception. The case that we were solving before was when the 
        resultRegister == baseRegister in a GetById, or left/rightRegister == resultRegister in a Snippet.
        This code is correct in wanting to spill in that case, even though it might spill
        when we don't need it to (i.e the result is not needed for value recovery). Once I
        investigated this bug further, I realized that the previous rule is just a
        partial subset of the rule that says we should spill anytime the result is
        a register we might do value recovery on. This patch implements the rule that
        says we always want to spill the result when we will do value recovery on it 
        if an exception is thrown.

        * ftl/FTLCompile.cpp:
        (JSC::FTL::mmAllocateDataSection):
        * tests/stress/ftl-try-catch-getter-throw-interesting-value-recovery.js: Added.
        (assert):
        (random):
        (identity):
        (let.o2.get f):
        (let.o3.get f):
        (foo):
        (i.else):

2016-01-18  Konstantin Tokarev  <annulen@yandex.ru>

        [MIPS] LLInt: fix calculation of Global Offset Table
        https://bugs.webkit.org/show_bug.cgi?id=150381

        Offlineasm adds a .cpload $t9 when we create a label in MIPS, which
        computes address of GOT. However, this instruction requires $t9 to
        contain address of current function. So we need to set $t9 to pcBase,
        otherwise GOT-related calculations will be invalid.

        Since offlineasm does not allow direct move to $t9 on MIPS, added new
        instruction setcallreg which does exactly that.

        Reviewed by Michael Saboff.

        * llint/LowLevelInterpreter.asm:
        * offlineasm/instructions.rb:
        * offlineasm/mips.rb:

2016-01-18  Csaba Osztrogonác  <ossy@webkit.org>

        REGRESSION(r194601): Fix the jsc timeout option of jsc.cpp
        https://bugs.webkit.org/show_bug.cgi?id=153204

        Reviewed by Michael Catanzaro.

        * jsc.cpp:
        (main):

2016-01-18  Csaba Osztrogonác  <ossy@webkit.org>

        [cmake] Add testair to the build system
        https://bugs.webkit.org/show_bug.cgi?id=153126

        Reviewed by Michael Catanzaro.

        * shell/CMakeLists.txt:

2016-01-17  Jeremy Huddleston Sequoia  <jeremyhu@apple.com>

        Ensure that CF_AVAILABLE is undefined when building webkit-gtk

        https://bugs.webkit.org/show_bug.cgi?id=152720

        This change ensures that CF_AVAILABLE is correctly a no-op to
        address build failure that was observed when building on older
        versions of OSX.  Previously, CF_AVAILABLE may have been unexpectedly
        re-defined to the system header value based on include-order.

        Reviewed by Michael Catanzaro.

        * API/WebKitAvailability.h:

2016-01-17  Julien Brianceau  <jbriance@cisco.com>

        [mips] Fix regT2 and regT3 trampling in MacroAssembler
        https://bugs.webkit.org/show_bug.cgi?id=153131

        Mips $t2 and $t3 registers were used as temporary registers
        in MacroAssemblerMIPS.h, whereas they are mapped to regT2
        and regT3 in LLInt and GPRInfo.

        This patch rearranges register mapping for the mips architecture:
        - use $t0 and $t1 as temp registers in LLInt (as in MacroAssembler)
        - use $t7 and $t8 as temp registers in MacroAssembler (as in LLInt)
        - remove $t6 from temp registers list in LLInt
        - update GPRInfo.h accordingly
        - add mips macroScratchRegisters() list in RegisterSet.cpp

        Reviewed by Michael Saboff.

        * assembler/MacroAssemblerMIPS.h:
        * jit/GPRInfo.h:
        (JSC::GPRInfo::toRegister):
        (JSC::GPRInfo::toIndex):
        * jit/RegisterSet.cpp:
        (JSC::RegisterSet::macroScratchRegisters):
        (JSC::RegisterSet::calleeSaveRegisters):
        * offlineasm/mips.rb:

2016-01-16  Skachkov Oleksandr  <gskachkov@gmail.com>

        [ES6] Arrow function syntax. Arrow function should support the destructuring parameters.
        https://bugs.webkit.org/show_bug.cgi?id=146934

        Reviewed by Saam Barati.
        
        Added support of destructuring parameters, before arrow function expect only simple parameters,
        e.g. (), (x), (x, y) or x in assigment expressio. To support destructuring parameters added
        additional check that check for destructuring paramters if check does not pass for simple parameters.

        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::isArrowFunctionParameters):
        (JSC::Parser<LexerType>::parseAssignmentExpression):
        * parser/Parser.h:

2016-01-15  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Legalize Memory Offsets for ARM64 before lowering to Air
        https://bugs.webkit.org/show_bug.cgi?id=153065

        Reviewed by Mark Lam.
        Reviewed by Filip Pizlo.

        On ARM64, we cannot use signed 32bits offset for memory addressing.
        There are two available addressing: signed 9bits and unsigned scaled 12bits.
        Air already knows about it.

        In this patch, the offsets are changed to something valid for ARM64
        prior to lowering. When an offset is invalid, it is just computed
        before the instruction and used as the base for addressing.

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/B3Generate.cpp:
        (JSC::B3::generateToAir):
        * b3/B3LegalizeMemoryOffsets.cpp: Added.
        (JSC::B3::legalizeMemoryOffsets):
        * b3/B3LegalizeMemoryOffsets.h: Added.
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::effectiveAddr): Deleted.
        * b3/testb3.cpp:
        (JSC::B3::testLoadWithOffsetImpl):
        (JSC::B3::testLoadOffsetImm9Max):
        (JSC::B3::testLoadOffsetImm9MaxPlusOne):
        (JSC::B3::testLoadOffsetImm9MaxPlusTwo):
        (JSC::B3::testLoadOffsetImm9Min):
        (JSC::B3::testLoadOffsetImm9MinMinusOne):
        (JSC::B3::testLoadOffsetScaledUnsignedImm12Max):
        (JSC::B3::testLoadOffsetScaledUnsignedOverImm12Max):
        (JSC::B3::run):

2016-01-15  Alex Christensen  <achristensen@webkit.org>

        Fix internal Windows build
        https://bugs.webkit.org/show_bug.cgi?id=153142

        Reviewed by Brent Fulgham.

        The internal Windows build builds JavaScriptCore from a directory that is not called JavaScriptCore.
        Searching for JavaScriptCore/API/APICast.h fails because it is in SomethingElse/API/APICast.h.
        Since we are including the JavaScriptCore directory, it is not necessary to have JavaScriptCore in
        the forwarding headers, but removing it allows builds form directories that are not named JavaScriptCore.

        * ForwardingHeaders/JavaScriptCore/APICast.h:
        * ForwardingHeaders/JavaScriptCore/JSBase.h:
        * ForwardingHeaders/JavaScriptCore/JSCTestRunnerUtils.h:
        * ForwardingHeaders/JavaScriptCore/JSContextRef.h:
        * ForwardingHeaders/JavaScriptCore/JSObjectRef.h:
        * ForwardingHeaders/JavaScriptCore/JSRetainPtr.h:
        * ForwardingHeaders/JavaScriptCore/JSStringRef.h:
        * ForwardingHeaders/JavaScriptCore/JSStringRefCF.h:
        * ForwardingHeaders/JavaScriptCore/JSValueRef.h:
        * ForwardingHeaders/JavaScriptCore/JavaScript.h:
        * ForwardingHeaders/JavaScriptCore/JavaScriptCore.h:
        * ForwardingHeaders/JavaScriptCore/OpaqueJSString.h:
        * ForwardingHeaders/JavaScriptCore/WebKitAvailability.h:

2016-01-15  Per Arne Vollan  <peavo@outlook.com>

        [B3][Win64] Compile fixes.
        https://bugs.webkit.org/show_bug.cgi?id=153127

        Reviewed by Alex Christensen.

        MSVC have several overloads of fmod, pow, and ceil. We need to suggest to MSVC
        which one we want to use.

        * b3/B3LowerMacros.cpp:
        * b3/B3LowerMacrosAfterOptimizations.cpp:
        * b3/B3MathExtras.cpp:
        (JSC::B3::powDoubleInt32):
        * b3/B3ReduceStrength.cpp:

2016-01-15  Filip Pizlo  <fpizlo@apple.com>

        Air needs a Shuffle instruction
        https://bugs.webkit.org/show_bug.cgi?id=152952

        Reviewed by Saam Barati.

        This adds an instruction called Shuffle. Shuffle allows you to simultaneously perform
        multiple moves to perform arbitrary permutations over registers and memory. We call these
        rotations. It also allows you to perform "shifts", like (a => b, b => c): after the shift,
        c will have b's old value, b will have a's old value, and a will be unchanged. Shifts can
        use immediates as their source.

        Shuffle is added as a custom instruction, since it has a variable number of arguments. It
        takes any number of triplets of arguments, where each triplet describes one mapping of the
        shuffle. For example, to represent (a => b, b => c), we might say:

            Shuffle %a, %b, 64, %b, %c, 64

        Note the "64"s, those are width arguments that describe how many bits of the register are
        being moved. Each triplet is referred to as a "shuffle pair". We call it a pair because the
        most relevant part of it is the pair of registers or memroy locations (i.e. %a, %b form one
        of the pairs in the example). For GP arguments, the width follows ZDef semantics.

        In the future, we will be able to use Shuffle for a lot of things. This patch is modest about
        how to use it:

        - C calling convention argument marshalling. Previously we used move instructions. But that's
          problematic since it introduces artificial interference between the argument registers and
          the inputs. Using Shuffle removes that interference. This helps a bit.

        - Cold C calls. This is what really motivated me to write this patch. If we have a C call on
          a cold path, then we want it to appear to the register allocator like it doesn't clobber
          any registers. Only after register allocation should we handle the clobbering by simply
          saving all of the live volatile registers to the stack. If you imagine the saving and the
          argument marshalling, you can see how before the call, we want to have a Shuffle that does
          both of those things. This is important. If argument marshalling was separate from the
          saving, then we'd still appear to clobber argument registers. Doing them together as one
          Shuffle means that the cold call doesn't appear to even clobber the argument registers.

        Unfortunately, I was wrong about cold C calls being the dominant problem with our register
        allocator right now. Fixing this revealed other problems in my current tuning benchmark,
        Octane/encrypt. Nonetheless, this is a small speed-up across the board, and gives us some
        functionality we will need to implement other optimizations.

        Relanding after fixing production build.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * assembler/AbstractMacroAssembler.h:
        (JSC::isX86_64):
        (JSC::isIOS):
        (JSC::optimizeForARMv7IDIVSupported):
        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::zeroExtend32ToPtr):
        (JSC::MacroAssemblerX86Common::swap32):
        (JSC::MacroAssemblerX86Common::moveConditionally32):
        * assembler/MacroAssemblerX86_64.h:
        (JSC::MacroAssemblerX86_64::store64WithAddressOffsetPatch):
        (JSC::MacroAssemblerX86_64::swap64):
        (JSC::MacroAssemblerX86_64::move64ToDouble):
        * assembler/X86Assembler.h:
        (JSC::X86Assembler::xchgl_rr):
        (JSC::X86Assembler::xchgl_rm):
        (JSC::X86Assembler::xchgq_rr):
        (JSC::X86Assembler::xchgq_rm):
        (JSC::X86Assembler::movl_rr):
        * b3/B3CCallValue.h:
        * b3/B3Compilation.cpp:
        (JSC::B3::Compilation::Compilation):
        (JSC::B3::Compilation::~Compilation):
        * b3/B3Compilation.h:
        (JSC::B3::Compilation::code):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::run):
        (JSC::B3::Air::LowerToAir::createSelect):
        (JSC::B3::Air::LowerToAir::lower):
        (JSC::B3::Air::LowerToAir::marshallCCallArgument): Deleted.
        * b3/B3OpaqueByproducts.h:
        (JSC::B3::OpaqueByproducts::count):
        * b3/B3StackmapSpecial.cpp:
        (JSC::B3::StackmapSpecial::isArgValidForValue):
        (JSC::B3::StackmapSpecial::isArgValidForRep):
        * b3/air/AirArg.cpp:
        (JSC::B3::Air::Arg::isStackMemory):
        (JSC::B3::Air::Arg::isRepresentableAs):
        (JSC::B3::Air::Arg::usesTmp):
        (JSC::B3::Air::Arg::canRepresent):
        (JSC::B3::Air::Arg::isCompatibleType):
        (JSC::B3::Air::Arg::dump):
        (WTF::printInternal):
        * b3/air/AirArg.h:
        (JSC::B3::Air::Arg::forEachType):
        (JSC::B3::Air::Arg::isWarmUse):
        (JSC::B3::Air::Arg::cooled):
        (JSC::B3::Air::Arg::isEarlyUse):
        (JSC::B3::Air::Arg::imm64):
        (JSC::B3::Air::Arg::immPtr):
        (JSC::B3::Air::Arg::addr):
        (JSC::B3::Air::Arg::special):
        (JSC::B3::Air::Arg::widthArg):
        (JSC::B3::Air::Arg::operator==):
        (JSC::B3::Air::Arg::isImm64):
        (JSC::B3::Air::Arg::isSomeImm):
        (JSC::B3::Air::Arg::isAddr):
        (JSC::B3::Air::Arg::isIndex):
        (JSC::B3::Air::Arg::isMemory):
        (JSC::B3::Air::Arg::isRelCond):
        (JSC::B3::Air::Arg::isSpecial):
        (JSC::B3::Air::Arg::isWidthArg):
        (JSC::B3::Air::Arg::isAlive):
        (JSC::B3::Air::Arg::base):
        (JSC::B3::Air::Arg::hasOffset):
        (JSC::B3::Air::Arg::offset):
        (JSC::B3::Air::Arg::width):
        (JSC::B3::Air::Arg::isGPTmp):
        (JSC::B3::Air::Arg::isGP):
        (JSC::B3::Air::Arg::isFP):
        (JSC::B3::Air::Arg::isType):
        (JSC::B3::Air::Arg::isGPR):
        (JSC::B3::Air::Arg::isValidForm):
        (JSC::B3::Air::Arg::forEachTmpFast):
        * b3/air/AirBasicBlock.h:
        (JSC::B3::Air::BasicBlock::insts):
        (JSC::B3::Air::BasicBlock::appendInst):
        (JSC::B3::Air::BasicBlock::append):
        * b3/air/AirCCallingConvention.cpp: Added.
        (JSC::B3::Air::computeCCallingConvention):
        (JSC::B3::Air::cCallResult):
        (JSC::B3::Air::buildCCall):
        * b3/air/AirCCallingConvention.h: Added.
        * b3/air/AirCode.h:
        (JSC::B3::Air::Code::proc):
        * b3/air/AirCustom.cpp: Added.
        (JSC::B3::Air::CCallCustom::isValidForm):
        (JSC::B3::Air::CCallCustom::generate):
        (JSC::B3::Air::ShuffleCustom::isValidForm):
        (JSC::B3::Air::ShuffleCustom::generate):
        * b3/air/AirCustom.h:
        (JSC::B3::Air::PatchCustom::forEachArg):
        (JSC::B3::Air::PatchCustom::generate):
        (JSC::B3::Air::CCallCustom::forEachArg):
        (JSC::B3::Air::CCallCustom::isValidFormStatic):
        (JSC::B3::Air::CCallCustom::admitsStack):
        (JSC::B3::Air::CCallCustom::hasNonArgNonControlEffects):
        (JSC::B3::Air::ColdCCallCustom::forEachArg):
        (JSC::B3::Air::ShuffleCustom::forEachArg):
        (JSC::B3::Air::ShuffleCustom::isValidFormStatic):
        (JSC::B3::Air::ShuffleCustom::admitsStack):
        (JSC::B3::Air::ShuffleCustom::hasNonArgNonControlEffects):
        * b3/air/AirEmitShuffle.cpp: Added.
        (JSC::B3::Air::ShufflePair::dump):
        (JSC::B3::Air::emitShuffle):
        * b3/air/AirEmitShuffle.h: Added.
        (JSC::B3::Air::ShufflePair::ShufflePair):
        (JSC::B3::Air::ShufflePair::src):
        (JSC::B3::Air::ShufflePair::dst):
        (JSC::B3::Air::ShufflePair::width):
        * b3/air/AirGenerate.cpp:
        (JSC::B3::Air::prepareForGeneration):
        * b3/air/AirGenerate.h:
        * b3/air/AirInsertionSet.cpp:
        (JSC::B3::Air::InsertionSet::insertInsts):
        (JSC::B3::Air::InsertionSet::execute):
        * b3/air/AirInsertionSet.h:
        (JSC::B3::Air::InsertionSet::insertInst):
        (JSC::B3::Air::InsertionSet::insert):
        * b3/air/AirInst.h:
        (JSC::B3::Air::Inst::operator bool):
        (JSC::B3::Air::Inst::append):
        * b3/air/AirLowerAfterRegAlloc.cpp: Added.
        (JSC::B3::Air::lowerAfterRegAlloc):
        * b3/air/AirLowerAfterRegAlloc.h: Added.
        * b3/air/AirLowerMacros.cpp: Added.
        (JSC::B3::Air::lowerMacros):
        * b3/air/AirLowerMacros.h: Added.
        * b3/air/AirOpcode.opcodes:
        * b3/air/AirRegisterPriority.h:
        (JSC::B3::Air::regsInPriorityOrder):
        * b3/air/testair.cpp: Added.
        (hiddenTruthBecauseNoReturnIsStupid):
        (usage):
        (JSC::B3::Air::compile):
        (JSC::B3::Air::invoke):
        (JSC::B3::Air::compileAndRun):
        (JSC::B3::Air::testSimple):
        (JSC::B3::Air::loadConstantImpl):
        (JSC::B3::Air::loadConstant):
        (JSC::B3::Air::loadDoubleConstant):
        (JSC::B3::Air::testShuffleSimpleSwap):
        (JSC::B3::Air::testShuffleSimpleShift):
        (JSC::B3::Air::testShuffleLongShift):
        (JSC::B3::Air::testShuffleLongShiftBackwards):
        (JSC::B3::Air::testShuffleSimpleRotate):
        (JSC::B3::Air::testShuffleSimpleBroadcast):
        (JSC::B3::Air::testShuffleBroadcastAllRegs):
        (JSC::B3::Air::testShuffleTreeShift):
        (JSC::B3::Air::testShuffleTreeShiftBackward):
        (JSC::B3::Air::testShuffleTreeShiftOtherBackward):
        (JSC::B3::Air::testShuffleMultipleShifts):
        (JSC::B3::Air::testShuffleRotateWithFringe):
        (JSC::B3::Air::testShuffleRotateWithLongFringe):
        (JSC::B3::Air::testShuffleMultipleRotates):
        (JSC::B3::Air::testShuffleShiftAndRotate):
        (JSC::B3::Air::testShuffleShiftAllRegs):
        (JSC::B3::Air::testShuffleRotateAllRegs):
        (JSC::B3::Air::testShuffleSimpleSwap64):
        (JSC::B3::Air::testShuffleSimpleShift64):
        (JSC::B3::Air::testShuffleSwapMixedWidth):
        (JSC::B3::Air::testShuffleShiftMixedWidth):
        (JSC::B3::Air::testShuffleShiftMemory):
        (JSC::B3::Air::testShuffleShiftMemoryLong):
        (JSC::B3::Air::testShuffleShiftMemoryAllRegs):
        (JSC::B3::Air::testShuffleShiftMemoryAllRegs64):
        (JSC::B3::Air::combineHiLo):
        (JSC::B3::Air::testShuffleShiftMemoryAllRegsMixedWidth):
        (JSC::B3::Air::testShuffleRotateMemory):
        (JSC::B3::Air::testShuffleRotateMemory64):
        (JSC::B3::Air::testShuffleRotateMemoryMixedWidth):
        (JSC::B3::Air::testShuffleRotateMemoryAllRegs64):
        (JSC::B3::Air::testShuffleRotateMemoryAllRegsMixedWidth):
        (JSC::B3::Air::testShuffleSwapDouble):
        (JSC::B3::Air::testShuffleShiftDouble):
        (JSC::B3::Air::run):
        (run):
        (main):
        * b3/testb3.cpp:
        (JSC::B3::testCallSimple):
        (JSC::B3::testCallRare):
        (JSC::B3::testCallRareLive):
        (JSC::B3::testCallSimplePure):
        (JSC::B3::run):

2016-01-15  Andy VanWagoner  <thetalecrafter@gmail.com>

        [INTL] Implement Date.prototype.toLocaleString in ECMA-402
        https://bugs.webkit.org/show_bug.cgi?id=147611

        Reviewed by Benjamin Poulain.

        Expose dateProtoFuncGetTime as thisTimeValue for builtins.
        Remove unused code in DateTimeFormat toDateTimeOptions, and make the
        function specific to the call in initializeDateTimeFormat. Properly
        throw when the options parameter is null.
        Add toLocaleString in builtin JavaScript, with it's own specific branch
        of toDateTimeOptions.

        * CMakeLists.txt:
        * DerivedSources.make:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * builtins/DatePrototype.js: Added.
        (toLocaleString.toDateTimeOptionsAnyAll):
        (toLocaleString):
        * runtime/CommonIdentifiers.h:
        * runtime/DatePrototype.cpp:
        (JSC::DatePrototype::finishCreation):
        * runtime/DatePrototype.h:
        * runtime/IntlDateTimeFormat.cpp:
        (JSC::toDateTimeOptionsAnyDate):
        (JSC::IntlDateTimeFormat::initializeDateTimeFormat):
        (JSC::toDateTimeOptions): Deleted.
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):

2016-01-15  Konstantin Tokarev  <annulen@yandex.ru>

        [mips] Implemented emitFunctionPrologue/Epilogue
        https://bugs.webkit.org/show_bug.cgi?id=152947

        Reviewed by Michael Saboff.

        * assembler/MacroAssemblerMIPS.h:
        (JSC::MacroAssemblerMIPS::popPair):
        (JSC::MacroAssemblerMIPS::pushPair):
        * jit/AssemblyHelpers.h:
        (JSC::AssemblyHelpers::emitFunctionPrologue):
        (JSC::AssemblyHelpers::emitFunctionEpilogueWithEmptyFrame):
        (JSC::AssemblyHelpers::emitFunctionEpilogue):

2016-01-15  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r195084.
        https://bugs.webkit.org/show_bug.cgi?id=153132

        Broke Production build (Requested by ap on #webkit).

        Reverted changeset:

        "Air needs a Shuffle instruction"
        https://bugs.webkit.org/show_bug.cgi?id=152952
        http://trac.webkit.org/changeset/195084

2016-01-15  Julien Brianceau  <jbriance@cisco.com>

        [mips] Add countLeadingZeros32 implementation in macro assembler
        https://bugs.webkit.org/show_bug.cgi?id=152886

        Reviewed by Michael Saboff.

        * assembler/MIPSAssembler.h:
        (JSC::MIPSAssembler::lui):
        (JSC::MIPSAssembler::clz):
        (JSC::MIPSAssembler::addiu):
        * assembler/MacroAssemblerMIPS.h:
        (JSC::MacroAssemblerMIPS::and32):
        (JSC::MacroAssemblerMIPS::countLeadingZeros32):
        (JSC::MacroAssemblerMIPS::lshift32):

2016-01-14  Filip Pizlo  <fpizlo@apple.com>

        Air needs a Shuffle instruction
        https://bugs.webkit.org/show_bug.cgi?id=152952

        Reviewed by Saam Barati.

        This adds an instruction called Shuffle. Shuffle allows you to simultaneously perform
        multiple moves to perform arbitrary permutations over registers and memory. We call these
        rotations. It also allows you to perform "shifts", like (a => b, b => c): after the shift,
        c will have b's old value, b will have a's old value, and a will be unchanged. Shifts can
        use immediates as their source.

        Shuffle is added as a custom instruction, since it has a variable number of arguments. It
        takes any number of triplets of arguments, where each triplet describes one mapping of the
        shuffle. For example, to represent (a => b, b => c), we might say:

            Shuffle %a, %b, 64, %b, %c, 64

        Note the "64"s, those are width arguments that describe how many bits of the register are
        being moved. Each triplet is referred to as a "shuffle pair". We call it a pair because the
        most relevant part of it is the pair of registers or memroy locations (i.e. %a, %b form one
        of the pairs in the example). For GP arguments, the width follows ZDef semantics.

        In the future, we will be able to use Shuffle for a lot of things. This patch is modest about
        how to use it:

        - C calling convention argument marshalling. Previously we used move instructions. But that's
          problematic since it introduces artificial interference between the argument registers and
          the inputs. Using Shuffle removes that interference. This helps a bit.

        - Cold C calls. This is what really motivated me to write this patch. If we have a C call on
          a cold path, then we want it to appear to the register allocator like it doesn't clobber
          any registers. Only after register allocation should we handle the clobbering by simply
          saving all of the live volatile registers to the stack. If you imagine the saving and the
          argument marshalling, you can see how before the call, we want to have a Shuffle that does
          both of those things. This is important. If argument marshalling was separate from the
          saving, then we'd still appear to clobber argument registers. Doing them together as one
          Shuffle means that the cold call doesn't appear to even clobber the argument registers.

        Unfortunately, I was wrong about cold C calls being the dominant problem with our register
        allocator right now. Fixing this revealed other problems in my current tuning benchmark,
        Octane/encrypt. Nonetheless, this is a small speed-up across the board, and gives us some
        functionality we will need to implement other optimizations.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * assembler/AbstractMacroAssembler.h:
        (JSC::isX86_64):
        (JSC::isIOS):
        (JSC::optimizeForARMv7IDIVSupported):
        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::zeroExtend32ToPtr):
        (JSC::MacroAssemblerX86Common::swap32):
        (JSC::MacroAssemblerX86Common::moveConditionally32):
        * assembler/MacroAssemblerX86_64.h:
        (JSC::MacroAssemblerX86_64::store64WithAddressOffsetPatch):
        (JSC::MacroAssemblerX86_64::swap64):
        (JSC::MacroAssemblerX86_64::move64ToDouble):
        * assembler/X86Assembler.h:
        (JSC::X86Assembler::xchgl_rr):
        (JSC::X86Assembler::xchgl_rm):
        (JSC::X86Assembler::xchgq_rr):
        (JSC::X86Assembler::xchgq_rm):
        (JSC::X86Assembler::movl_rr):
        * b3/B3CCallValue.h:
        * b3/B3Compilation.cpp:
        (JSC::B3::Compilation::Compilation):
        (JSC::B3::Compilation::~Compilation):
        * b3/B3Compilation.h:
        (JSC::B3::Compilation::code):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::run):
        (JSC::B3::Air::LowerToAir::createSelect):
        (JSC::B3::Air::LowerToAir::lower):
        (JSC::B3::Air::LowerToAir::marshallCCallArgument): Deleted.
        * b3/B3OpaqueByproducts.h:
        (JSC::B3::OpaqueByproducts::count):
        * b3/B3StackmapSpecial.cpp:
        (JSC::B3::StackmapSpecial::isArgValidForValue):
        (JSC::B3::StackmapSpecial::isArgValidForRep):
        * b3/air/AirArg.cpp:
        (JSC::B3::Air::Arg::isStackMemory):
        (JSC::B3::Air::Arg::isRepresentableAs):
        (JSC::B3::Air::Arg::usesTmp):
        (JSC::B3::Air::Arg::canRepresent):
        (JSC::B3::Air::Arg::isCompatibleType):
        (JSC::B3::Air::Arg::dump):
        (WTF::printInternal):
        * b3/air/AirArg.h:
        (JSC::B3::Air::Arg::forEachType):
        (JSC::B3::Air::Arg::isWarmUse):
        (JSC::B3::Air::Arg::cooled):
        (JSC::B3::Air::Arg::isEarlyUse):
        (JSC::B3::Air::Arg::imm64):
        (JSC::B3::Air::Arg::immPtr):
        (JSC::B3::Air::Arg::addr):
        (JSC::B3::Air::Arg::special):
        (JSC::B3::Air::Arg::widthArg):
        (JSC::B3::Air::Arg::operator==):
        (JSC::B3::Air::Arg::isImm64):
        (JSC::B3::Air::Arg::isSomeImm):
        (JSC::B3::Air::Arg::isAddr):
        (JSC::B3::Air::Arg::isIndex):
        (JSC::B3::Air::Arg::isMemory):
        (JSC::B3::Air::Arg::isRelCond):
        (JSC::B3::Air::Arg::isSpecial):
        (JSC::B3::Air::Arg::isWidthArg):
        (JSC::B3::Air::Arg::isAlive):
        (JSC::B3::Air::Arg::base):
        (JSC::B3::Air::Arg::hasOffset):
        (JSC::B3::Air::Arg::offset):
        (JSC::B3::Air::Arg::width):
        (JSC::B3::Air::Arg::isGPTmp):
        (JSC::B3::Air::Arg::isGP):
        (JSC::B3::Air::Arg::isFP):
        (JSC::B3::Air::Arg::isType):
        (JSC::B3::Air::Arg::isGPR):
        (JSC::B3::Air::Arg::isValidForm):
        (JSC::B3::Air::Arg::forEachTmpFast):
        * b3/air/AirBasicBlock.h:
        (JSC::B3::Air::BasicBlock::insts):
        (JSC::B3::Air::BasicBlock::appendInst):
        (JSC::B3::Air::BasicBlock::append):
        * b3/air/AirCCallingConvention.cpp: Added.
        (JSC::B3::Air::computeCCallingConvention):
        (JSC::B3::Air::cCallResult):
        (JSC::B3::Air::buildCCall):
        * b3/air/AirCCallingConvention.h: Added.
        * b3/air/AirCode.h:
        (JSC::B3::Air::Code::proc):
        * b3/air/AirCustom.cpp: Added.
        (JSC::B3::Air::CCallCustom::isValidForm):
        (JSC::B3::Air::CCallCustom::generate):
        (JSC::B3::Air::ShuffleCustom::isValidForm):
        (JSC::B3::Air::ShuffleCustom::generate):
        * b3/air/AirCustom.h:
        (JSC::B3::Air::PatchCustom::forEachArg):
        (JSC::B3::Air::PatchCustom::generate):
        (JSC::B3::Air::CCallCustom::forEachArg):
        (JSC::B3::Air::CCallCustom::isValidFormStatic):
        (JSC::B3::Air::CCallCustom::admitsStack):
        (JSC::B3::Air::CCallCustom::hasNonArgNonControlEffects):
        (JSC::B3::Air::ColdCCallCustom::forEachArg):
        (JSC::B3::Air::ShuffleCustom::forEachArg):
        (JSC::B3::Air::ShuffleCustom::isValidFormStatic):
        (JSC::B3::Air::ShuffleCustom::admitsStack):
        (JSC::B3::Air::ShuffleCustom::hasNonArgNonControlEffects):
        * b3/air/AirEmitShuffle.cpp: Added.
        (JSC::B3::Air::ShufflePair::dump):
        (JSC::B3::Air::emitShuffle):
        * b3/air/AirEmitShuffle.h: Added.
        (JSC::B3::Air::ShufflePair::ShufflePair):
        (JSC::B3::Air::ShufflePair::src):
        (JSC::B3::Air::ShufflePair::dst):
        (JSC::B3::Air::ShufflePair::width):
        * b3/air/AirGenerate.cpp:
        (JSC::B3::Air::prepareForGeneration):
        * b3/air/AirGenerate.h:
        * b3/air/AirInsertionSet.cpp:
        (JSC::B3::Air::InsertionSet::insertInsts):
        (JSC::B3::Air::InsertionSet::execute):
        * b3/air/AirInsertionSet.h:
        (JSC::B3::Air::InsertionSet::insertInst):
        (JSC::B3::Air::InsertionSet::insert):
        * b3/air/AirInst.h:
        (JSC::B3::Air::Inst::operator bool):
        (JSC::B3::Air::Inst::append):
        * b3/air/AirLowerAfterRegAlloc.cpp: Added.
        (JSC::B3::Air::lowerAfterRegAlloc):
        * b3/air/AirLowerAfterRegAlloc.h: Added.
        * b3/air/AirLowerMacros.cpp: Added.
        (JSC::B3::Air::lowerMacros):
        * b3/air/AirLowerMacros.h: Added.
        * b3/air/AirOpcode.opcodes:
        * b3/air/AirRegisterPriority.h:
        (JSC::B3::Air::regsInPriorityOrder):
        * b3/air/testair.cpp: Added.
        (hiddenTruthBecauseNoReturnIsStupid):
        (usage):
        (JSC::B3::Air::compile):
        (JSC::B3::Air::invoke):
        (JSC::B3::Air::compileAndRun):
        (JSC::B3::Air::testSimple):
        (JSC::B3::Air::loadConstantImpl):
        (JSC::B3::Air::loadConstant):
        (JSC::B3::Air::loadDoubleConstant):
        (JSC::B3::Air::testShuffleSimpleSwap):
        (JSC::B3::Air::testShuffleSimpleShift):
        (JSC::B3::Air::testShuffleLongShift):
        (JSC::B3::Air::testShuffleLongShiftBackwards):
        (JSC::B3::Air::testShuffleSimpleRotate):
        (JSC::B3::Air::testShuffleSimpleBroadcast):
        (JSC::B3::Air::testShuffleBroadcastAllRegs):
        (JSC::B3::Air::testShuffleTreeShift):
        (JSC::B3::Air::testShuffleTreeShiftBackward):
        (JSC::B3::Air::testShuffleTreeShiftOtherBackward):
        (JSC::B3::Air::testShuffleMultipleShifts):
        (JSC::B3::Air::testShuffleRotateWithFringe):
        (JSC::B3::Air::testShuffleRotateWithLongFringe):
        (JSC::B3::Air::testShuffleMultipleRotates):
        (JSC::B3::Air::testShuffleShiftAndRotate):
        (JSC::B3::Air::testShuffleShiftAllRegs):
        (JSC::B3::Air::testShuffleRotateAllRegs):
        (JSC::B3::Air::testShuffleSimpleSwap64):
        (JSC::B3::Air::testShuffleSimpleShift64):
        (JSC::B3::Air::testShuffleSwapMixedWidth):
        (JSC::B3::Air::testShuffleShiftMixedWidth):
        (JSC::B3::Air::testShuffleShiftMemory):
        (JSC::B3::Air::testShuffleShiftMemoryLong):
        (JSC::B3::Air::testShuffleShiftMemoryAllRegs):
        (JSC::B3::Air::testShuffleShiftMemoryAllRegs64):
        (JSC::B3::Air::combineHiLo):
        (JSC::B3::Air::testShuffleShiftMemoryAllRegsMixedWidth):
        (JSC::B3::Air::testShuffleRotateMemory):
        (JSC::B3::Air::testShuffleRotateMemory64):
        (JSC::B3::Air::testShuffleRotateMemoryMixedWidth):
        (JSC::B3::Air::testShuffleRotateMemoryAllRegs64):
        (JSC::B3::Air::testShuffleRotateMemoryAllRegsMixedWidth):
        (JSC::B3::Air::testShuffleSwapDouble):
        (JSC::B3::Air::testShuffleShiftDouble):
        (JSC::B3::Air::run):
        (run):
        (main):
        * b3/testb3.cpp:
        (JSC::B3::testCallSimple):
        (JSC::B3::testCallRare):
        (JSC::B3::testCallRareLive):
        (JSC::B3::testCallSimplePure):
        (JSC::B3::run):

2016-01-14  Keith Miller  <keith_miller@apple.com>

        Unreviewed mark passing es6 tests as no longer failing.

        * tests/es6.yaml:

2016-01-14  Keith Miller  <keith_miller@apple.com>

        [ES6] Support subclassing Function.
        https://bugs.webkit.org/show_bug.cgi?id=153081

        Reviewed by Geoffrey Garen.

        This patch enables subclassing the Function object. It also fixes an existing
        bug that prevented users from subclassing functions that have a function in
        the superclass's prototype property.

        * bytecompiler/NodesCodegen.cpp:
        (JSC::ClassExprNode::emitBytecode):
        * runtime/FunctionConstructor.cpp:
        (JSC::constructWithFunctionConstructor):
        (JSC::constructFunction):
        (JSC::constructFunctionSkippingEvalEnabledCheck):
        * runtime/FunctionConstructor.h:
        * runtime/JSFunction.cpp:
        (JSC::JSFunction::create):
        * runtime/JSFunction.h:
        (JSC::JSFunction::createImpl):
        * runtime/JSFunctionInlines.h:
        (JSC::JSFunction::createWithInvalidatedReallocationWatchpoint):
        (JSC::JSFunction::JSFunction): Deleted.
        * tests/stress/class-subclassing-function.js: Added.

2016-01-13  Carlos Garcia Campos  <cgarcia@igalia.com>

        [CMake] Do not use LLVM static libraries for FTL JIT
        https://bugs.webkit.org/show_bug.cgi?id=151559

        Reviewed by Michael Catanzaro.

        Allow ports decide whether to prefer linking to llvm static or
        dynamic libraries. This patch only changes the behavior of the GTK
        port, other ports can change the default behavior by setting
        llvmForJSC_LIBRARIES in their platform specific cmake files.

        * CMakeLists.txt: Move llvmForJSC library definition after the
        WEBKIT_INCLUDE_CONFIG_FILES_IF_EXISTS, to allow platform specific
        files to set their own llvmForJSC_LIBRARIES. When not set, it
        defaults to LLVM_STATIC_LIBRARIES. The command to create
        WebKitLLVMLibraryToken.h no longer depends on the static
        libraries, since we are going to make the build fail anyway when
        not found in case of linking to the static libraries. If platform
        specific file defined llvmForJSC_INSTALL_DIR llvmForJSC is also
        installed to the given destination.
        * PlatformGTK.cmake: Set llvmForJSC_LIBRARIES and
        llvmForJSC_INSTALL_DIR.

2016-01-13  Saam barati  <sbarati@apple.com>

        NativeExecutable should have a name field
        https://bugs.webkit.org/show_bug.cgi?id=153083

        Reviewed by Geoffrey Garen.

        This is going to help the SamplingProfiler come up
        with names for NativeExecutable objects it encounters.

        * jit/JITThunks.cpp:
        (JSC::JITThunks::finalize):
        (JSC::JITThunks::hostFunctionStub):
        * jit/JITThunks.h:
        * runtime/Executable.h:
        * runtime/JSBoundFunction.cpp:
        (JSC::JSBoundFunction::create):
        * runtime/JSFunction.cpp:
        (JSC::JSFunction::create):
        (JSC::JSFunction::lookUpOrCreateNativeExecutable):
        * runtime/JSFunction.h:
        (JSC::JSFunction::createImpl):
        * runtime/JSNativeStdFunction.cpp:
        (JSC::JSNativeStdFunction::create):
        * runtime/VM.cpp:
        (JSC::thunkGeneratorForIntrinsic):
        (JSC::VM::getHostFunction):
        * runtime/VM.h:
        (JSC::VM::getCTIStub):
        (JSC::VM::exceptionOffset):

2016-01-13  Keith Miller  <keith_miller@apple.com>

        [ES6] Support subclassing the String builtin object
        https://bugs.webkit.org/show_bug.cgi?id=153068

        Reviewed by Michael Saboff.

        This patch adds subclassing of strings. Also, this patch fixes a bug where we could have
        the wrong indexing type for builtins constructed without storage.

        * runtime/PrototypeMap.cpp:
        (JSC::PrototypeMap::emptyStructureForPrototypeFromBaseStructure):
        * runtime/StringConstructor.cpp:
        (JSC::constructWithStringConstructor):
        * tests/stress/class-subclassing-string.js: Added.
        (test):

2016-01-13  Mark Lam  <mark.lam@apple.com>

        The StringFromCharCode DFG intrinsic should support untyped operands.
        https://bugs.webkit.org/show_bug.cgi?id=153046

        Reviewed by Geoffrey Garen.

        The current StringFromCharCode DFG intrinsic assumes that its operand charCode
        must be an Int32.  This results in 26000+ BadType OSR exits in the LongSpider
        crypto-aes benchmark.  With support for Untyped operands, the number of OSR
        exits drops to 202.

        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGOperations.cpp:
        * dfg/DFGOperations.h:
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileFromCharCode):
        * dfg/DFGSpeculativeJIT.h:
        (JSC::DFG::SpeculativeJIT::callOperation):
        * dfg/DFGValidate.cpp:
        (JSC::DFG::Validate::validate):
        * runtime/JSCJSValueInlines.h:
        (JSC::JSValue::toUInt32):

2016-01-13  Mark Lam  <mark.lam@apple.com>

        Use DFG Graph::binary/unaryArithShouldSpeculateInt32/MachineInt() functions consistently.
        https://bugs.webkit.org/show_bug.cgi?id=153080

        Reviewed by Geoffrey Garen.

        We currently have Graph::mulShouldSpeculateInt32/machineInt() and
        Graph::negateShouldSpeculateInt32/MachineInt() functions which are only used by
        the ArithMul and ArithNegate nodes.  However, the same tests need to be done for
        many other arith nodes in the DFG.  This patch renames these functions as
        Graph::binaryArithShouldSpeculateInt32/machineInt() and
        Graph::unaryArithShouldSpeculateInt32/MachineInt(), and uses them consistently
        in the DFG.

        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGGraph.h:
        (JSC::DFG::Graph::addShouldSpeculateMachineInt):
        (JSC::DFG::Graph::binaryArithShouldSpeculateInt32):
        (JSC::DFG::Graph::binaryArithShouldSpeculateMachineInt):
        (JSC::DFG::Graph::unaryArithShouldSpeculateInt32):
        (JSC::DFG::Graph::unaryArithShouldSpeculateMachineInt):
        (JSC::DFG::Graph::mulShouldSpeculateInt32): Deleted.
        (JSC::DFG::Graph::mulShouldSpeculateMachineInt): Deleted.
        (JSC::DFG::Graph::negateShouldSpeculateInt32): Deleted.
        (JSC::DFG::Graph::negateShouldSpeculateMachineInt): Deleted.
        * dfg/DFGPredictionPropagationPhase.cpp:
        (JSC::DFG::PredictionPropagationPhase::propagate):
        (JSC::DFG::PredictionPropagationPhase::doDoubleVoting):

2016-01-13  Joseph Pecoraro  <pecoraro@apple.com>

        Web Inspector: Inspector should use the last sourceURL / sourceMappingURL directive
        https://bugs.webkit.org/show_bug.cgi?id=153072
        <rdar://problem/24168312>

        Reviewed by Timothy Hatcher.

        * parser/Lexer.cpp:
        (JSC::Lexer<T>::parseCommentDirective):
        Just keep overwriting the member variable so we end up with
        the last directive value.

2016-01-13  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r194969.
        https://bugs.webkit.org/show_bug.cgi?id=153075

        This change broke the iOS build (Requested by ryanhaddad on
        #webkit).

        Reverted changeset:

        "[JSC] Legalize Memory Offsets for ARM64 before lowering to
        Air"
        https://bugs.webkit.org/show_bug.cgi?id=153065
        http://trac.webkit.org/changeset/194969

2016-01-13  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Legalize Memory Offsets for ARM64 before lowering to Air
        https://bugs.webkit.org/show_bug.cgi?id=153065

        Reviewed by Mark Lam.
        Reviewed by Filip Pizlo.

        On ARM64, we cannot use signed 32bits offset for memory addressing.
        There are two available addressing: signed 9bits and unsigned scaled 12bits.
        Air already knows about it.

        In this patch, the offsets are changed to something valid for ARM64
        prior to lowering. When an offset is invalid, it is just computed
        before the instruction and used as the base for addressing.

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/B3Generate.cpp:
        (JSC::B3::generateToAir):
        * b3/B3LegalizeMemoryOffsets.cpp: Added.
        (JSC::B3::legalizeMemoryOffsets):
        * b3/B3LegalizeMemoryOffsets.h: Added.
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::effectiveAddr): Deleted.
        * b3/testb3.cpp:
        (JSC::B3::testLoadWithOffsetImpl):
        (JSC::B3::testLoadOffsetImm9Max):
        (JSC::B3::testLoadOffsetImm9MaxPlusOne):
        (JSC::B3::testLoadOffsetImm9MaxPlusTwo):
        (JSC::B3::testLoadOffsetImm9Min):
        (JSC::B3::testLoadOffsetImm9MinMinusOne):
        (JSC::B3::testLoadOffsetScaledUnsignedImm12Max):
        (JSC::B3::testLoadOffsetScaledUnsignedOverImm12Max):
        (JSC::B3::run):

2016-01-12  Per Arne Vollan  <peavo@outlook.com>

        [FTL][Win64] Compile error.
        https://bugs.webkit.org/show_bug.cgi?id=153031

        Reviewed by Brent Fulgham.

        The header file dlfcn.h does not exist on Windows.

        * ftl/FTLLowerDFGToLLVM.cpp:

2016-01-12  Ryosuke Niwa  <rniwa@webkit.org>

        Add a build flag for custom element
        https://bugs.webkit.org/show_bug.cgi?id=153005

        Reviewed by Alex Christensen.

        * Configurations/FeatureDefines.xcconfig:

2016-01-12  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Remove some invalid immediate instruction forms from ARM64 Air
        https://bugs.webkit.org/show_bug.cgi?id=153024

        Reviewed by Michael Saboff.

        * b3/B3BasicBlock.h:
        Export the symbols for testb3.

        * b3/air/AirOpcode.opcodes:
        We had 2 invalid opcodes:
        -Compare with immediate just does not exist.
        -Test64 with immediate exists but Air does not recognize
         the valid form of bit-immediates.

        * b3/testb3.cpp:
        (JSC::B3::genericTestCompare):
        (JSC::B3::testCompareImpl):
        Extend the tests to cover what was invalid.

2016-01-12  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] JSC does not build with FTL_USES_B3 on ARM64
        https://bugs.webkit.org/show_bug.cgi?id=153011

        Reviewed by Saam Barati.

        Apparently the static const member can only be used for constexpr.
        C++ is weird.

        * jit/GPRInfo.cpp:
        * jit/GPRInfo.h:

2016-01-11  Johan K. Jensen  <jj@johanjensen.dk>

        Web Inspector: console.count() shouldn't show a colon in front of a number
        https://bugs.webkit.org/show_bug.cgi?id=152038

        Reviewed by Brian Burg.

        * inspector/agents/InspectorConsoleAgent.cpp:
        (Inspector::InspectorConsoleAgent::count):
        Do not include title and colon if the title is empty.

2016-01-11  Dan Bernstein  <mitz@apple.com>

        Reverted r194317.

        Reviewed by Joseph Pecoraro.

        r194317 did not contain a change log entry, did not explain the motivation, did not name a
        reviewer, and does not seem necessary.

        * JavaScriptCore.xcodeproj/project.pbxproj:

2016-01-11  Joseph Pecoraro  <pecoraro@apple.com>

        keywords ("super", "delete", etc) should be valid method names
        https://bugs.webkit.org/show_bug.cgi?id=144281

        Reviewed by Ryosuke Niwa.

        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseClass):
        - When parsing "static(" treat it as a method named "static" and not a static method.
        - When parsing a keyword treat it like a string method name (get and set are not keywords)
        - When parsing a getter / setter method name identifier, allow lookahead to be a keyword

        (JSC::Parser<LexerType>::parseGetterSetter):
        - When parsing the getter / setter's name, allow it to be a keyword.

2016-01-11  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Add Div/Mod and fix Mul for B3 ARM64
        https://bugs.webkit.org/show_bug.cgi?id=152978

        Reviewed by Filip Pizlo.

        Add the 3 operands forms of Mul.
        Remove the form taking immediate on ARM64, there are no such instruction.

        Add Div with sdiv.

        Unfortunately, I discovered ChillMod's division by zero
        makes it non-trivial on ARM64. I just made it into a macro like on x86.

        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::mul32):
        (JSC::MacroAssemblerARM64::mul64):
        (JSC::MacroAssemblerARM64::div32):
        (JSC::MacroAssemblerARM64::div64):
        * b3/B3LowerMacros.cpp:
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::lower):
        * b3/air/AirOpcode.opcodes:

2016-01-11  Keith Miller  <keith_miller@apple.com>

        Arrays should use the InternalFunctionAllocationProfile when constructing new Arrays
        https://bugs.webkit.org/show_bug.cgi?id=152949

        Reviewed by Michael Saboff.

        This patch updates Array constructors to use the new InternalFunctionAllocationProfile.

        * runtime/ArrayConstructor.cpp:
        (JSC::constructArrayWithSizeQuirk):
        (JSC::constructWithArrayConstructor):
        * runtime/InternalFunction.h:
        (JSC::InternalFunction::createStructure):
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::arrayStructureForIndexingTypeDuringAllocation):
        (JSC::JSGlobalObject::arrayStructureForProfileDuringAllocation):
        (JSC::constructEmptyArray):
        (JSC::constructArray):
        (JSC::constructArrayNegativeIndexed):
        * runtime/PrototypeMap.cpp:
        (JSC::PrototypeMap::emptyStructureForPrototypeFromBaseStructure):
        * runtime/Structure.h:
        * runtime/StructureInlines.h:

2016-01-08  Keith Miller  <keith_miller@apple.com>

        Use a profile to store allocation structures for subclasses of InternalFunctions
        https://bugs.webkit.org/show_bug.cgi?id=152942

        Reviewed by Michael Saboff.

        This patch adds InternalFunctionAllocationProfile to FunctionRareData, which holds
        a cached structure that can be used to quickly allocate any derived class of an InternalFunction.
        InternalFunctionAllocationProfile ended up being distinct from ObjectAllocationProfile, due to
        constraints imposed by Reflect.construct. Reflect.construct allows the user to pass an arbitrary
        constructor as a new.target to any other constructor. This means that a user can pass some
        non-derived constructor to an InternalFunction (they can even pass another InternalFunction as the
        new.target). If we use the same profile for both InternalFunctions and JS allocations then we always
        need to check in both JS code and C++ code that the profiled structure has the same ClassInfo as the
        current constructor. By using different profiles, we only need to check the profile in InternalFunctions
        as all JS constructed objects share the same ClassInfo (JSFinalObject). This comes at the relatively
        low cost of using slightly more memory on FunctionRareData and being slightly more conceptually complex.

        Additionally, this patch adds subclassing to some omitted classes.

        * API/JSObjectRef.cpp:
        (JSObjectMakeDate):
        (JSObjectMakeRegExp):
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * bytecode/InternalFunctionAllocationProfile.h: Added.
        (JSC::InternalFunctionAllocationProfile::structure):
        (JSC::InternalFunctionAllocationProfile::clear):
        (JSC::InternalFunctionAllocationProfile::visitAggregate):
        (JSC::InternalFunctionAllocationProfile::createAllocationStructureFromBase):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::parseBlock):
        * dfg/DFGOperations.cpp:
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * jit/JITOpcodes.cpp:
        (JSC::JIT::emit_op_create_this):
        * jit/JITOpcodes32_64.cpp:
        (JSC::JIT::emit_op_create_this):
        * llint/LowLevelInterpreter32_64.asm:
        * llint/LowLevelInterpreter64.asm:
        * runtime/BooleanConstructor.cpp:
        (JSC::constructWithBooleanConstructor):
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/DateConstructor.cpp:
        (JSC::constructDate):
        (JSC::constructWithDateConstructor):
        * runtime/DateConstructor.h:
        * runtime/ErrorConstructor.cpp:
        (JSC::Interpreter::constructWithErrorConstructor):
        * runtime/FunctionRareData.cpp:
        (JSC::FunctionRareData::create):
        (JSC::FunctionRareData::visitChildren):
        (JSC::FunctionRareData::FunctionRareData):
        (JSC::FunctionRareData::initializeObjectAllocationProfile):
        (JSC::FunctionRareData::clear):
        (JSC::FunctionRareData::finishCreation): Deleted.
        (JSC::FunctionRareData::initialize): Deleted.
        * runtime/FunctionRareData.h:
        (JSC::FunctionRareData::offsetOfObjectAllocationProfile):
        (JSC::FunctionRareData::objectAllocationProfile):
        (JSC::FunctionRareData::objectAllocationStructure):
        (JSC::FunctionRareData::allocationProfileWatchpointSet):
        (JSC::FunctionRareData::isObjectAllocationProfileInitialized):
        (JSC::FunctionRareData::internalFunctionAllocationStructure):
        (JSC::FunctionRareData::createInternalFunctionAllocationStructureFromBase):
        (JSC::FunctionRareData::offsetOfAllocationProfile): Deleted.
        (JSC::FunctionRareData::allocationProfile): Deleted.
        (JSC::FunctionRareData::allocationStructure): Deleted.
        (JSC::FunctionRareData::isInitialized): Deleted.
        * runtime/InternalFunction.cpp:
        (JSC::InternalFunction::createSubclassStructure):
        * runtime/InternalFunction.h:
        * runtime/JSArrayBufferConstructor.cpp:
        (JSC::constructArrayBuffer):
        * runtime/JSFunction.cpp:
        (JSC::JSFunction::allocateRareData):
        (JSC::JSFunction::allocateAndInitializeRareData):
        (JSC::JSFunction::initializeRareData):
        * runtime/JSFunction.h:
        (JSC::JSFunction::rareData):
        * runtime/JSGenericTypedArrayViewConstructorInlines.h:
        (JSC::constructGenericTypedArrayView):
        * runtime/JSObject.h:
        (JSC::JSFinalObject::typeInfo):
        (JSC::JSFinalObject::createStructure):
        * runtime/JSPromiseConstructor.cpp:
        (JSC::constructPromise):
        * runtime/JSPromiseConstructor.h:
        * runtime/JSWeakMap.cpp:
        * runtime/JSWeakSet.cpp:
        * runtime/MapConstructor.cpp:
        (JSC::constructMap):
        * runtime/NativeErrorConstructor.cpp:
        (JSC::Interpreter::constructWithNativeErrorConstructor):
        * runtime/NumberConstructor.cpp:
        (JSC::constructWithNumberConstructor):
        * runtime/PrototypeMap.cpp:
        (JSC::PrototypeMap::createEmptyStructure):
        (JSC::PrototypeMap::emptyStructureForPrototypeFromBaseStructure):
        (JSC::PrototypeMap::emptyObjectStructureForPrototype):
        (JSC::PrototypeMap::clearEmptyObjectStructureForPrototype):
        * runtime/PrototypeMap.h:
        * runtime/RegExpConstructor.cpp:
        (JSC::getRegExpStructure):
        (JSC::constructRegExp):
        (JSC::constructWithRegExpConstructor):
        * runtime/RegExpConstructor.h:
        * runtime/SetConstructor.cpp:
        (JSC::constructSet):
        * runtime/WeakMapConstructor.cpp:
        (JSC::constructWeakMap):
        * runtime/WeakSetConstructor.cpp:
        (JSC::constructWeakSet):
        * tests/stress/class-subclassing-misc.js:
        (A):
        (D):
        (E):
        (WM):
        (WS):
        (test):
        * tests/stress/class-subclassing-typedarray.js: Added.
        (test):

2016-01-11  Per Arne Vollan  <peavo@outlook.com>

        [B3][Win64] Compile error.
        https://bugs.webkit.org/show_bug.cgi?id=152984

        Reviewed by Alex Christensen.

        Windows does not have bzero, use memset instead.

        * b3/air/AirIteratedRegisterCoalescing.cpp:

2016-01-11  Konstantin Tokarev  <annulen@yandex.ru>

        Fixed compilation of JavaScriptCore with GCC 4.8 on 32-bit platforms
        https://bugs.webkit.org/show_bug.cgi?id=152923

        Reviewed by Alex Christensen.

        * jit/CallFrameShuffler.h:
        (JSC::CallFrameShuffler::assumeCalleeIsCell):

2016-01-11  Csaba Osztrogonác  <ossy@webkit.org>

        [B3] Fix control reaches end of non-void function GCC warnings on Linux
        https://bugs.webkit.org/show_bug.cgi?id=152887

        Reviewed by Mark Lam.

        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::createBranch):
        (JSC::B3::Air::LowerToAir::createCompare):
        (JSC::B3::Air::LowerToAir::createSelect):
        * b3/B3Type.h:
        (JSC::B3::sizeofType):
        * b3/air/AirArg.cpp:
        (JSC::B3::Air::Arg::isRepresentableAs):
        * b3/air/AirArg.h:
        (JSC::B3::Air::Arg::isAnyUse):
        (JSC::B3::Air::Arg::isColdUse):
        (JSC::B3::Air::Arg::isEarlyUse):
        (JSC::B3::Air::Arg::isLateUse):
        (JSC::B3::Air::Arg::isAnyDef):
        (JSC::B3::Air::Arg::isEarlyDef):
        (JSC::B3::Air::Arg::isLateDef):
        (JSC::B3::Air::Arg::isZDef):
        (JSC::B3::Air::Arg::widthForB3Type):
        (JSC::B3::Air::Arg::isGP):
        (JSC::B3::Air::Arg::isFP):
        (JSC::B3::Air::Arg::isType):
        (JSC::B3::Air::Arg::isValidForm):
        * b3/air/AirCode.h:
        (JSC::B3::Air::Code::newTmp):
        (JSC::B3::Air::Code::numTmps):

2016-01-11  Filip Pizlo  <fpizlo@apple.com>

        Make it easier to introduce exotic instructions to Air
        https://bugs.webkit.org/show_bug.cgi?id=152953

        Reviewed by Benjamin Poulain.

        Currently, you can define new "opcodes" in Air using either:

        1) New opcode declared in AirOpcode.opcodes.
        2) Patch opcode with a new implementation of Air::Special.

        With (1), you are limited to fixed-argument-length instructions. There are other
        restrictions as well, like that you can only use the roles that the AirOpcode syntax
        supports.

        With (2), you can do anything you like, but the instruction will be harder to match
        since it will share the same opcode as any other Patch. Also, the instruction will have
        the Special argument, which means more busy-work when creating the instruction and
        validating it.

        This introduces an in-between facility called "custom". This replaces what AirOpcode
        previously called "special". A custom instruction is one whose behavior is defined by a
        FooCustom struct with some static methods. Calls to those methods are emitted by
        opcode_generator.rb.

        The "custom" facility is powerful enough to be used to implement Patch, with the caveat
        that we now treat the Patch instruction specially in a few places. Those places were
        already effectively treating it specially by assuming that only Patch instructions have
        a Special as their first argument.

        This will let me implement the Shuffle instruction (bug 152952), which I think is needed
        for performance work.

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/air/AirCustom.h: Added.
        (JSC::B3::Air::PatchCustom::forEachArg):
        (JSC::B3::Air::PatchCustom::isValidFormStatic):
        (JSC::B3::Air::PatchCustom::isValidForm):
        (JSC::B3::Air::PatchCustom::admitsStack):
        (JSC::B3::Air::PatchCustom::hasNonArgNonControlEffects):
        (JSC::B3::Air::PatchCustom::generate):
        * b3/air/AirHandleCalleeSaves.cpp:
        (JSC::B3::Air::handleCalleeSaves):
        * b3/air/AirInst.h:
        * b3/air/AirInstInlines.h:
        (JSC::B3::Air::Inst::forEach):
        (JSC::B3::Air::Inst::extraClobberedRegs):
        (JSC::B3::Air::Inst::extraEarlyClobberedRegs):
        (JSC::B3::Air::Inst::forEachDefWithExtraClobberedRegs):
        (JSC::B3::Air::Inst::reportUsedRegisters):
        (JSC::B3::Air::Inst::hasSpecial): Deleted.
        * b3/air/AirOpcode.opcodes:
        * b3/air/AirReportUsedRegisters.cpp:
        (JSC::B3::Air::reportUsedRegisters):
        * b3/air/opcode_generator.rb:

2016-01-11  Filip Pizlo  <fpizlo@apple.com>

        Turn Check(true) into Patchpoint() followed by Oops
        https://bugs.webkit.org/show_bug.cgi?id=152968

        Reviewed by Benjamin Poulain.

        This is an obvious strength reduction to have, especially since if we discover that the
        input to the Check is true after some amount of B3 optimization, then stubbing out the rest
        of the basic block unlocks CFG simplification opportunities.

        It's also a proof-of-concept for the Check->Patchpoint conversion that I'll use once I
        implement sinking (bug 152162).

        * b3/B3ControlValue.cpp:
        (JSC::B3::ControlValue::convertToJump):
        (JSC::B3::ControlValue::convertToOops):
        (JSC::B3::ControlValue::dumpMeta):
        * b3/B3ControlValue.h:
        * b3/B3InsertionSet.h:
        (JSC::B3::InsertionSet::insertValue):
        * b3/B3InsertionSetInlines.h:
        (JSC::B3::InsertionSet::insert):
        * b3/B3ReduceStrength.cpp:
        * b3/B3StackmapValue.h:
        * b3/B3Value.h:
        * tests/stress/ftl-force-osr-exit.js: Added.

2016-01-11  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] When resolving Stack arguments, use addressing from SP when addressing from FP is invalid
        https://bugs.webkit.org/show_bug.cgi?id=152840

        Reviewed by Mark Lam.

        ARM64 has two kinds of addressing with immediates:
        -Signed 9bits direct (really only -256 to 255).
        -Unsigned 12bits scaled by the load/store size.

        When resolving the stack addresses, we easily run
        past -256 bytes from FP. Addressing from SP gives us more
        room to address the stack efficiently because we can
        use unsigned immediates.

        * b3/B3StackmapSpecial.cpp:
        (JSC::B3::StackmapSpecial::repForArg):
        * b3/air/AirAllocateStack.cpp:
        (JSC::B3::Air::allocateStack):

2016-01-10  Saam barati  <sbarati@apple.com>

        Implement a sampling profiler
        https://bugs.webkit.org/show_bug.cgi?id=151713

        Reviewed by Filip Pizlo.

        This patch implements a sampling profiler for JavaScriptCore
        that will be used in the Inspector UI. The implementation works as follows:
        We queue the sampling profiler to run a task on a background
        thread every 1ms. When the queued task executes, the sampling profiler
        will pause the JSC execution thread and attempt to take a stack trace. 
        The sampling profiler does everything it can to be very careful
        while taking this stack trace. Because it's reading arbitrary memory,
        the sampling profiler must validate every pointer it reads from.

        The sampling profiler tries to get an ExecutableBase for every call frame
        it reads. It first tries to read the CodeBlock slot. It does this because
        it can be 100% certain that a pointer is a CodeBlock while it's taking a
        stack trace. But, not every call frame will have a CodeBlock. So we must read
        the call frame's callee. For these stack traces where we read the callee, we
        must verify the callee pointer, and the pointer traversal to an ExecutableBase,
        on the main JSC execution thread, and not on the thread taking the stack
        trace. We do this verification either before we run the marking phase in
        GC, or when somebody asks the SamplingProfiler to materialize its data.

        The SamplingProfiler must also be careful to not grab any locks while the JSC execution
        thread is paused (this means it can't do anything that mallocs) because
        that could cause a deadlock. Therefore, the sampling profiler grabs
        locks for all data structures it consults before it pauses the JSC
        execution thread.

        * CMakeLists.txt:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * bytecode/CodeBlock.h:
        (JSC::CodeBlock::clearVisitWeaklyHasBeenCalled):
        (JSC::CodeBlockSet::mark):
        * dfg/DFGNodeType.h:
        * heap/CodeBlockSet.cpp:
        (JSC::CodeBlockSet::add):
        (JSC::CodeBlockSet::promoteYoungCodeBlocks):
        (JSC::CodeBlockSet::clearMarksForFullCollection):
        (JSC::CodeBlockSet::lastChanceToFinalize):
        (JSC::CodeBlockSet::deleteUnmarkedAndUnreferenced):
        (JSC::CodeBlockSet::contains):
        (JSC::CodeBlockSet::writeBarrierCurrentlyExecutingCodeBlocks):
        (JSC::CodeBlockSet::remove): Deleted.
        * heap/CodeBlockSet.h:
        (JSC::CodeBlockSet::getLock):
        (JSC::CodeBlockSet::iterate):
        The sampling pofiler uses the heap's CodeBlockSet to validate
        CodeBlock pointers. This data structure must now be under a lock
        because we must be certain we're not pausing the JSC execution thread
        while it's manipulating this data structure.

        * heap/ConservativeRoots.cpp:
        (JSC::ConservativeRoots::ConservativeRoots):
        (JSC::ConservativeRoots::grow):
        (JSC::ConservativeRoots::genericAddPointer):
        (JSC::ConservativeRoots::genericAddSpan):
        (JSC::ConservativeRoots::add):
        (JSC::CompositeMarkHook::CompositeMarkHook):
        (JSC::CompositeMarkHook::mark):
        * heap/ConservativeRoots.h:
        * heap/Heap.cpp:
        (JSC::Heap::markRoots):
        (JSC::Heap::visitHandleStack):
        (JSC::Heap::visitSamplingProfiler):
        (JSC::Heap::traceCodeBlocksAndJITStubRoutines):
        (JSC::Heap::snapshotMarkedSpace):
        * heap/Heap.h:
        (JSC::Heap::structureIDTable):
        (JSC::Heap::codeBlockSet):
        * heap/MachineStackMarker.cpp:
        (pthreadSignalHandlerSuspendResume):
        (JSC::getCurrentPlatformThread):
        (JSC::MachineThreads::MachineThreads):
        (JSC::MachineThreads::~MachineThreads):
        (JSC::MachineThreads::Thread::createForCurrentThread):
        (JSC::MachineThreads::Thread::operator==):
        (JSC::isThreadInList):
        (JSC::MachineThreads::addCurrentThread):
        (JSC::MachineThreads::machineThreadForCurrentThread):
        (JSC::MachineThreads::removeThread):
        (JSC::MachineThreads::gatherFromCurrentThread):
        (JSC::MachineThreads::Thread::Thread):
        (JSC::MachineThreads::Thread::~Thread):
        (JSC::MachineThreads::Thread::suspend):
        (JSC::MachineThreads::Thread::resume):
        (JSC::MachineThreads::Thread::getRegisters):
        (JSC::MachineThreads::Thread::Registers::stackPointer):
        (JSC::MachineThreads::Thread::Registers::framePointer):
        (JSC::MachineThreads::Thread::Registers::instructionPointer):
        (JSC::MachineThreads::Thread::freeRegisters):
        (JSC::MachineThreads::tryCopyOtherThreadStacks):
        (JSC::pthreadSignalHandlerSuspendResume): Deleted.
        (JSC::MachineThreads::Thread::operator!=): Deleted.
        * heap/MachineStackMarker.h:
        (JSC::MachineThreads::Thread::operator!=):
        (JSC::MachineThreads::getLock):
        (JSC::MachineThreads::threadsListHead):
        We can now ask a MachineThreads::Thread for its frame pointer
        and program counter on darwin and windows platforms. efl
        and gtk implementations will happen in another patch.

        * heap/MarkedBlockSet.h:
        (JSC::MarkedBlockSet::getLock):
        (JSC::MarkedBlockSet::add):
        (JSC::MarkedBlockSet::remove):
        (JSC::MarkedBlockSet::recomputeFilter):
        (JSC::MarkedBlockSet::filter):
        (JSC::MarkedBlockSet::set):
        * heap/MarkedSpace.cpp:
        (JSC::Free::Free):
        (JSC::Free::operator()):
        (JSC::FreeOrShrink::FreeOrShrink):
        (JSC::FreeOrShrink::operator()):
        (JSC::MarkedSpace::~MarkedSpace):
        (JSC::MarkedSpace::isPagedOut):
        (JSC::MarkedSpace::freeBlock):
        (JSC::MarkedSpace::freeOrShrinkBlock):
        (JSC::MarkedSpace::shrink):
        * heap/MarkedSpace.h:
        (JSC::MarkedSpace::forEachLiveCell):
        (JSC::MarkedSpace::forEachDeadCell):
        * interpreter/CallFrame.h:
        (JSC::ExecState::calleeAsValue):
        (JSC::ExecState::callee):
        (JSC::ExecState::unsafeCallee):
        (JSC::ExecState::codeBlock):
        (JSC::ExecState::scope):
        * jit/ExecutableAllocator.cpp:
        (JSC::ExecutableAllocator::dumpProfile):
        (JSC::ExecutableAllocator::getLock):
        (JSC::ExecutableAllocator::isValidExecutableMemory):
        * jit/ExecutableAllocator.h:
        * jit/ExecutableAllocatorFixedVMPool.cpp:
        (JSC::ExecutableAllocator::allocate):
        (JSC::ExecutableAllocator::isValidExecutableMemory):
        (JSC::ExecutableAllocator::getLock):
        (JSC::ExecutableAllocator::committedByteCount):
        The sampling profiler consults the ExecutableAllocator to check
        if the frame pointer it reads is in executable allocated memory.

        * jsc.cpp:
        (GlobalObject::finishCreation):
        (functionCheckModuleSyntax):
        (functionStartSamplingProfiler):
        (functionSamplingProfilerStackTraces):
        * llint/LLIntPCRanges.h: Added.
        (JSC::LLInt::isLLIntPC):
        * offlineasm/asm.rb:
        I added the ability to test whether the PC is executing
        LLInt code because this code is not part of the memory
        our executable allocator allocates.

        * runtime/Executable.h:
        (JSC::ExecutableBase::isModuleProgramExecutable):
        (JSC::ExecutableBase::isExecutableType):
        (JSC::ExecutableBase::isHostFunction):
        * runtime/JSLock.cpp:
        (JSC::JSLock::didAcquireLock):
        (JSC::JSLock::unlock):
        * runtime/Options.h:
        * runtime/SamplingProfiler.cpp: Added.
        (JSC::reportStats):
        (JSC::FrameWalker::FrameWalker):
        (JSC::FrameWalker::walk):
        (JSC::FrameWalker::wasValidWalk):
        (JSC::FrameWalker::advanceToParentFrame):
        (JSC::FrameWalker::isAtTop):
        (JSC::FrameWalker::resetAtMachineFrame):
        (JSC::FrameWalker::isValidFramePointer):
        (JSC::FrameWalker::isValidCodeBlock):
        (JSC::FrameWalker::tryToGetExecutableFromCallee):
        The FrameWalker class is used to walk the stack in a safe
        manner. It doesn't do anything that would deadlock, and it
        validates all pointers that it sees.

        (JSC::SamplingProfiler::SamplingProfiler):
        (JSC::SamplingProfiler::~SamplingProfiler):
        (JSC::SamplingProfiler::visit):
        (JSC::SamplingProfiler::shutdown):
        (JSC::SamplingProfiler::start):
        (JSC::SamplingProfiler::stop):
        (JSC::SamplingProfiler::pause):
        (JSC::SamplingProfiler::noticeCurrentThreadAsJSCExecutionThread):
        (JSC::SamplingProfiler::dispatchIfNecessary):
        (JSC::SamplingProfiler::dispatchFunction):
        (JSC::SamplingProfiler::noticeJSLockAcquisition):
        (JSC::SamplingProfiler::noticeVMEntry):
        (JSC::SamplingProfiler::observeStackTrace):
        (JSC::SamplingProfiler::clearData):
        (JSC::displayName):
        (JSC::startLine):
        (JSC::startColumn):
        (JSC::sourceID):
        (JSC::url):
        (JSC::SamplingProfiler::stacktracesAsJSON):
        * runtime/SamplingProfiler.h: Added.
        (JSC::SamplingProfiler::getLock):
        (JSC::SamplingProfiler::setTimingInterval):
        (JSC::SamplingProfiler::stackTraces):
        * runtime/VM.cpp:
        (JSC::VM::VM):
        (JSC::VM::~VM):
        (JSC::VM::setLastStackTop):
        (JSC::VM::createContextGroup):
        (JSC::VM::ensureWatchdog):
        (JSC::VM::ensureSamplingProfiler):
        (JSC::thunkGeneratorForIntrinsic):
        * runtime/VM.h:
        (JSC::VM::watchdog):
        (JSC::VM::isSafeToRecurse):
        (JSC::VM::lastStackTop):
        (JSC::VM::scratchBufferForSize):
        (JSC::VM::samplingProfiler):
        (JSC::VM::setShouldRewriteConstAsVar):
        (JSC::VM::setLastStackTop): Deleted.
        * runtime/VMEntryScope.cpp:
        (JSC::VMEntryScope::VMEntryScope):
        * tests/stress/sampling-profiler: Added.
        * tests/stress/sampling-profiler-anonymous-function.js: Added.
        (foo):
        (baz):
        * tests/stress/sampling-profiler-basic.js: Added.
        (bar):
        (foo):
        (nothing):
        (top):
        (jaz):
        (kaz):
        (checkInlining):
        * tests/stress/sampling-profiler-deep-stack.js: Added.
        (foo):
        (hellaDeep):
        (start):
        * tests/stress/sampling-profiler-microtasks.js: Added.
        (testResults):
        (loop.jaz):
        (loop):
        * tests/stress/sampling-profiler/samplingProfiler.js: Added.
        (assert):
        (let.nodePrototype.makeChildIfNeeded):
        (makeNode):
        (updateCallingContextTree):
        (doesTreeHaveStackTrace):
        (makeTree):
        (runTest):
        (dumpTree):
        * tools/JSDollarVMPrototype.cpp:
        (JSC::JSDollarVMPrototype::isInObjectSpace):
        (JSC::JSDollarVMPrototype::isInStorageSpace):
        * yarr/YarrJIT.cpp:
        (JSC::Yarr::YarrGenerator::generateEnter):
        (JSC::Yarr::YarrGenerator::generateReturn):
        (JSC::Yarr::YarrGenerator::YarrGenerator):
        (JSC::Yarr::YarrGenerator::compile):
        (JSC::Yarr::jitCompile):
        We now have a boolean that's set to true when
        we're executing a RegExp, and to false otherwise.
        The boolean lives off of VM.

        * CMakeLists.txt:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * bytecode/CodeBlock.h:
        (JSC::CodeBlock::clearVisitWeaklyHasBeenCalled):
        (JSC::CodeBlockSet::mark):
        * dfg/DFGNodeType.h:
        * heap/CodeBlockSet.cpp:
        (JSC::CodeBlockSet::add):
        (JSC::CodeBlockSet::promoteYoungCodeBlocks):
        (JSC::CodeBlockSet::clearMarksForFullCollection):
        (JSC::CodeBlockSet::lastChanceToFinalize):
        (JSC::CodeBlockSet::deleteUnmarkedAndUnreferenced):
        (JSC::CodeBlockSet::contains):
        (JSC::CodeBlockSet::writeBarrierCurrentlyExecutingCodeBlocks):
        (JSC::CodeBlockSet::remove): Deleted.
        * heap/CodeBlockSet.h:
        (JSC::CodeBlockSet::getLock):
        (JSC::CodeBlockSet::iterate):
        * heap/ConservativeRoots.cpp:
        (JSC::ConservativeRoots::ConservativeRoots):
        (JSC::ConservativeRoots::genericAddPointer):
        (JSC::ConservativeRoots::add):
        (JSC::CompositeMarkHook::CompositeMarkHook):
        (JSC::CompositeMarkHook::mark):
        * heap/ConservativeRoots.h:
        * heap/Heap.cpp:
        (JSC::Heap::markRoots):
        (JSC::Heap::visitHandleStack):
        (JSC::Heap::visitSamplingProfiler):
        (JSC::Heap::traceCodeBlocksAndJITStubRoutines):
        * heap/Heap.h:
        (JSC::Heap::structureIDTable):
        (JSC::Heap::codeBlockSet):
        * heap/HeapInlines.h:
        (JSC::Heap::didFreeBlock):
        (JSC::Heap::isPointerGCObject):
        (JSC::Heap::isValueGCObject):
        * heap/MachineStackMarker.cpp:
        (pthreadSignalHandlerSuspendResume):
        (JSC::getCurrentPlatformThread):
        (JSC::MachineThreads::MachineThreads):
        (JSC::MachineThreads::~MachineThreads):
        (JSC::MachineThreads::Thread::createForCurrentThread):
        (JSC::MachineThreads::Thread::operator==):
        (JSC::isThreadInList):
        (JSC::MachineThreads::addCurrentThread):
        (JSC::MachineThreads::machineThreadForCurrentThread):
        (JSC::MachineThreads::removeThread):
        (JSC::MachineThreads::gatherFromCurrentThread):
        (JSC::MachineThreads::Thread::Thread):
        (JSC::MachineThreads::Thread::~Thread):
        (JSC::MachineThreads::Thread::suspend):
        (JSC::MachineThreads::Thread::resume):
        (JSC::MachineThreads::Thread::getRegisters):
        (JSC::MachineThreads::Thread::Registers::stackPointer):
        (JSC::MachineThreads::Thread::Registers::framePointer):
        (JSC::MachineThreads::Thread::Registers::instructionPointer):
        (JSC::MachineThreads::Thread::freeRegisters):
        (JSC::pthreadSignalHandlerSuspendResume): Deleted.
        (JSC::MachineThreads::Thread::operator!=): Deleted.
        * heap/MachineStackMarker.h:
        (JSC::MachineThreads::Thread::operator!=):
        (JSC::MachineThreads::getLock):
        (JSC::MachineThreads::threadsListHead):
        * heap/MarkedBlockSet.h:
        * heap/MarkedSpace.cpp:
        (JSC::Free::Free):
        (JSC::Free::operator()):
        (JSC::FreeOrShrink::FreeOrShrink):
        (JSC::FreeOrShrink::operator()):
        * interpreter/CallFrame.h:
        (JSC::ExecState::calleeAsValue):
        (JSC::ExecState::callee):
        (JSC::ExecState::unsafeCallee):
        (JSC::ExecState::codeBlock):
        (JSC::ExecState::scope):
        * jit/ExecutableAllocator.cpp:
        (JSC::ExecutableAllocator::dumpProfile):
        (JSC::ExecutableAllocator::getLock):
        (JSC::ExecutableAllocator::isValidExecutableMemory):
        * jit/ExecutableAllocator.h:
        * jit/ExecutableAllocatorFixedVMPool.cpp:
        (JSC::ExecutableAllocator::allocate):
        (JSC::ExecutableAllocator::isValidExecutableMemory):
        (JSC::ExecutableAllocator::getLock):
        (JSC::ExecutableAllocator::committedByteCount):
        * jsc.cpp:
        (GlobalObject::finishCreation):
        (functionCheckModuleSyntax):
        (functionPlatformSupportsSamplingProfiler):
        (functionStartSamplingProfiler):
        (functionSamplingProfilerStackTraces):
        * llint/LLIntPCRanges.h: Added.
        (JSC::LLInt::isLLIntPC):
        * offlineasm/asm.rb:
        * runtime/Executable.h:
        (JSC::ExecutableBase::isModuleProgramExecutable):
        (JSC::ExecutableBase::isExecutableType):
        (JSC::ExecutableBase::isHostFunction):
        * runtime/JSLock.cpp:
        (JSC::JSLock::didAcquireLock):
        (JSC::JSLock::unlock):
        * runtime/Options.h:
        * runtime/SamplingProfiler.cpp: Added.
        (JSC::reportStats):
        (JSC::FrameWalker::FrameWalker):
        (JSC::FrameWalker::walk):
        (JSC::FrameWalker::wasValidWalk):
        (JSC::FrameWalker::advanceToParentFrame):
        (JSC::FrameWalker::isAtTop):
        (JSC::FrameWalker::resetAtMachineFrame):
        (JSC::FrameWalker::isValidFramePointer):
        (JSC::FrameWalker::isValidCodeBlock):
        (JSC::SamplingProfiler::SamplingProfiler):
        (JSC::SamplingProfiler::~SamplingProfiler):
        (JSC::SamplingProfiler::processUnverifiedStackTraces):
        (JSC::SamplingProfiler::visit):
        (JSC::SamplingProfiler::shutdown):
        (JSC::SamplingProfiler::start):
        (JSC::SamplingProfiler::stop):
        (JSC::SamplingProfiler::pause):
        (JSC::SamplingProfiler::noticeCurrentThreadAsJSCExecutionThread):
        (JSC::SamplingProfiler::dispatchIfNecessary):
        (JSC::SamplingProfiler::dispatchFunction):
        (JSC::SamplingProfiler::noticeJSLockAcquisition):
        (JSC::SamplingProfiler::noticeVMEntry):
        (JSC::SamplingProfiler::clearData):
        (JSC::displayName):
        (JSC::SamplingProfiler::stacktracesAsJSON):
        (WTF::printInternal):
        * runtime/SamplingProfiler.h: Added.
        (JSC::SamplingProfiler::StackFrame::StackFrame):
        (JSC::SamplingProfiler::getLock):
        (JSC::SamplingProfiler::setTimingInterval):
        (JSC::SamplingProfiler::stackTraces):
        * runtime/VM.cpp:
        (JSC::VM::VM):
        (JSC::VM::~VM):
        (JSC::VM::setLastStackTop):
        (JSC::VM::createContextGroup):
        (JSC::VM::ensureWatchdog):
        (JSC::VM::ensureSamplingProfiler):
        (JSC::thunkGeneratorForIntrinsic):
        * runtime/VM.h:
        (JSC::VM::watchdog):
        (JSC::VM::samplingProfiler):
        (JSC::VM::isSafeToRecurse):
        (JSC::VM::lastStackTop):
        (JSC::VM::scratchBufferForSize):
        (JSC::VM::setLastStackTop): Deleted.
        * runtime/VMEntryScope.cpp:
        (JSC::VMEntryScope::VMEntryScope):
        * tests/stress/sampling-profiler: Added.
        * tests/stress/sampling-profiler-anonymous-function.js: Added.
        (platformSupportsSamplingProfiler.foo):
        (platformSupportsSamplingProfiler.baz):
        (platformSupportsSamplingProfiler):
        * tests/stress/sampling-profiler-basic.js: Added.
        (platformSupportsSamplingProfiler.bar):
        (platformSupportsSamplingProfiler.foo):
        (platformSupportsSamplingProfiler.nothing):
        (platformSupportsSamplingProfiler.top):
        (platformSupportsSamplingProfiler.jaz):
        (platformSupportsSamplingProfiler.kaz):
        (platformSupportsSamplingProfiler.checkInlining):
        (platformSupportsSamplingProfiler):
        * tests/stress/sampling-profiler-deep-stack.js: Added.
        (platformSupportsSamplingProfiler.foo):
        (platformSupportsSamplingProfiler.let.hellaDeep):
        (platformSupportsSamplingProfiler.let.start):
        (platformSupportsSamplingProfiler):
        * tests/stress/sampling-profiler-microtasks.js: Added.
        (platformSupportsSamplingProfiler.testResults):
        (platformSupportsSamplingProfiler):
        (platformSupportsSamplingProfiler.loop.jaz):
        (platformSupportsSamplingProfiler.loop):
        * tests/stress/sampling-profiler/samplingProfiler.js: Added.
        (assert):
        (let.nodePrototype.makeChildIfNeeded):
        (makeNode):
        (updateCallingContextTree):
        (doesTreeHaveStackTrace):
        (makeTree):
        (runTest):
        (dumpTree):
        * yarr/YarrJIT.cpp:
        (JSC::Yarr::YarrGenerator::generateEnter):
        (JSC::Yarr::YarrGenerator::generateReturn):
        (JSC::Yarr::YarrGenerator::YarrGenerator):
        (JSC::Yarr::YarrGenerator::compile):
        (JSC::Yarr::jitCompile):

2016-01-10  Yusuke Suzuki  <utatane.tea@gmail.com>

        [JSC] Iterating over a Set/Map is too slow
        https://bugs.webkit.org/show_bug.cgi?id=152691

        Reviewed by Saam Barati.

        Set#forEach and Set & for-of are very slow. There are 2 reasons.

        1. forEach is implemented in C++. And typically, taking JS callback and calling it from C++.

        C++ to JS transition seems costly. perf result in Linux machine shows this.

            Samples: 23K of event 'cycles', Event count (approx.): 21446074385
            34.04%  jsc  libjavascriptcoregtk-4.0.so.18.3.1  [.] JSC::Interpreter::execute(JSC::CallFrameClosure&)
            20.48%  jsc  libjavascriptcoregtk-4.0.so.18.3.1  [.] vmEntryToJavaScript
             9.80%  jsc  libjavascriptcoregtk-4.0.so.18.3.1  [.] JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*)
             7.95%  jsc  libjavascriptcoregtk-4.0.so.18.3.1  [.] JSC::setProtoFuncForEach(JSC::ExecState*)
             5.65%  jsc  perf-22854.map                      [.] 0x00007f5d2c204a6f

        Writing forEach in JS eliminates this.

            Samples: 23K of event 'cycles', Event count (approx.): 21255691651
            62.91%  jsc  perf-22890.map                      [.] 0x00007fd117c0a3b9
            24.89%  jsc  libjavascriptcoregtk-4.0.so.18.3.1  [.] JSC::privateFuncSetIteratorNext(JSC::ExecState*)
             0.29%  jsc  libjavascriptcoregtk-4.0.so.18.3.1  [.] JSC::CodeBlock::updateAllPredictionsAndCountLiveness(unsigned int&, unsigned int&)
             0.24%  jsc  [vdso]                              [.] 0x00000000000008e8
             0.22%  jsc  libjavascriptcoregtk-4.0.so.18.3.1  [.] JSC::CodeBlock::predictedMachineCodeSize()
             0.16%  jsc  libjavascriptcoregtk-4.0.so.18.3.1  [.] WTF::MetaAllocator::currentStatistics()
             0.15%  jsc  libjavascriptcoregtk-4.0.so.18.3.1  [.] JSC::Lexer<unsigned char>::lex(JSC::JSToken*, unsigned int, bool)

        2. Iterator result object allocation is costly.

        Iterator result object allocation is costly. Even if the (1) is solved, when executing Set & for-of, perf result shows very slow performance due to (2).

            Samples: 108K of event 'cycles', Event count (approx.): 95529273748
            18.02%  jsc  libjavascriptcoregtk-4.0.so.18.3.1  [.] JSC::createIteratorResultObject(JSC::ExecState*, JSC::JSValue, bool)
            15.68%  jsc  jsc                                 [.] JSC::JSObject::putDirect(JSC::VM&, JSC::PropertyName, JSC::JSValue, unsigned int)
            14.18%  jsc  libjavascriptcoregtk-4.0.so.18.3.1  [.] JSC::PrototypeMap::emptyObjectStructureForPrototype(JSC::JSObject*, unsigned int)
            13.40%  jsc  perf-25420.map                      [.] 0x00007fce158006a1
             6.79%  jsc  libjavascriptcoregtk-4.0.so.18.3.1  [.] JSC::StructureTransitionTable::get(WTF::UniquedStringImpl*, unsigned int) const

        In the long term, we should implement SetIterator#next in JS and make the iterator result object allocation written in JS to encourage object allocation elimination in FTL.
        But seeing the perf result, we can find the easy to fix bottleneck in the current implementation.
        Every time createIteratorResultObject creates the empty object and use putDirect to store properties.
        The pre-baked Structure* with `done` and `value` properties makes this implementation fast.

        After these improvements, the micro benchmark[1] shows the following.

        old:
            Linked List x 212,776 ops/sec ±0.21% (162 runs sampled)
            Array x 376,156 ops/sec ±0.20% (162 runs sampled)
            Array forEach x 17,345 ops/sec ±0.99% (137 runs sampled)
            Array for-of x 16,518 ops/sec ±0.58% (160 runs sampled)
            Set forEach x 13,263 ops/sec ±0.20% (162 runs sampled)
            Set for-of x 4,732 ops/sec ±0.34% (123 runs sampled)

        new:
            Linked List x 210,833 ops/sec ±0.28% (161 runs sampled)
            Array x 371,347 ops/sec ±0.36% (162 runs sampled)
            Array forEach x 17,460 ops/sec ±0.84% (136 runs sampled)
            Array for-of x 16,188 ops/sec ±1.27% (158 runs sampled)
            Set forEach x 23,684 ops/sec ±2.46% (139 runs sampled)
            Set for-of x 12,176 ops/sec ±0.54% (157 runs sampled)

        Set#forEach becomes comparable to Array#forEach. And Set#forEach and Set & for-of are improved (1.79x, and 2.57x).
        After this optimizations, they are still much slower than linked list and array.
        This should be optimized in the long term.

        [1]: https://gist.github.com/Constellation/8db5f5b8f12fe7e283d0

        * CMakeLists.txt:
        * DerivedSources.make:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * builtins/MapPrototype.js: Copied from Source/JavaScriptCore/runtime/IteratorOperations.h.
        (forEach):
        * builtins/SetPrototype.js: Copied from Source/JavaScriptCore/runtime/IteratorOperations.h.
        (forEach):
        * runtime/CommonIdentifiers.h:
        * runtime/IteratorOperations.cpp:
        (JSC::createIteratorResultObjectStructure):
        (JSC::createIteratorResultObject):
        * runtime/IteratorOperations.h:
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        (JSC::JSGlobalObject::visitChildren):
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::iteratorResultObjectStructure):
        (JSC::JSGlobalObject::iteratorResultStructure): Deleted.
        (JSC::JSGlobalObject::iteratorResultStructureOffset): Deleted.
        * runtime/MapPrototype.cpp:
        (JSC::MapPrototype::getOwnPropertySlot):
        (JSC::privateFuncIsMap):
        (JSC::privateFuncMapIterator):
        (JSC::privateFuncMapIteratorNext):
        (JSC::MapPrototype::finishCreation): Deleted.
        (JSC::mapProtoFuncForEach): Deleted.
        * runtime/MapPrototype.h:
        * runtime/SetPrototype.cpp:
        (JSC::SetPrototype::getOwnPropertySlot):
        (JSC::privateFuncIsSet):
        (JSC::privateFuncSetIterator):
        (JSC::privateFuncSetIteratorNext):
        (JSC::SetPrototype::finishCreation): Deleted.
        (JSC::setProtoFuncForEach): Deleted.
        * runtime/SetPrototype.h:

2016-01-10  Filip Pizlo  <fpizlo@apple.com>

        Unreviewed, fix ARM64 build.

        * b3/air/AirOpcode.opcodes:

2016-01-10  Filip Pizlo  <fpizlo@apple.com>

        B3 should reduce Trunc(BitOr(value, constant)) where !(constant & 0xffffffff) to Trunc(value)
        https://bugs.webkit.org/show_bug.cgi?id=152955

        Reviewed by Saam Barati.

        This happens when we box an int32 and then immediately unbox it.

        This makes an enormous difference on AsmBench/FloatMM. It's a 2x speed-up on that
        benchmark. It's neutral elsewhere.

        * b3/B3ReduceStrength.cpp:
        * b3/testb3.cpp:
        (JSC::B3::testPowDoubleByIntegerLoop):
        (JSC::B3::testTruncOrHigh):
        (JSC::B3::testTruncOrLow):
        (JSC::B3::testBitAndOrHigh):
        (JSC::B3::testBitAndOrLow):
        (JSC::B3::zero):
        (JSC::B3::run):

2016-01-10  Skachkov Oleksandr  <gskachkov@gmail.com>

        [ES6] Arrow function syntax. Get rid of JSArrowFunction and use standard JSFunction class
        https://bugs.webkit.org/show_bug.cgi?id=149855

        Reviewed by Saam Barati.

        JSArrowFunction.h/cpp were removed from JavaScriptCore, because now is used new approach for storing 
        'this', 'arguments' and 'super'

        * CMakeLists.txt:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileNewFunction):
        * dfg/DFGStructureRegistrationPhase.cpp:
        (JSC::DFG::StructureRegistrationPhase::run):
        * ftl/FTLAbstractHeapRepository.cpp:
        * ftl/FTLAbstractHeapRepository.h:
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNewFunction):
        * interpreter/Interpreter.cpp:
        * interpreter/Interpreter.h:
        * jit/JITOpcodes.cpp:
        * jit/JITOpcodes32_64.cpp:
        * jit/JITOperations.cpp:
        * jit/JITOperations.h:
        * llint/LLIntOffsetsExtractor.cpp:
        * llint/LLIntSlowPaths.cpp:
        * runtime/JSArrowFunction.cpp: Removed.
        * runtime/JSArrowFunction.h: Removed.
        * runtime/JSGlobalObject.cpp:
        * runtime/JSGlobalObject.h:

2016-01-10  Filip Pizlo  <fpizlo@apple.com>

        It should be possible to run liveness over registers without also tracking Tmps
        https://bugs.webkit.org/show_bug.cgi?id=152963

        Reviewed by Saam Barati.

        This adds a RegLivenessAdapter so that we can run Liveness over registers. This makes it
        easier to write certain kinds of phases, like ReportUsedRegisters. I anticipate writing more
        code like that for handling cold function calls. It also makes code like that somewhat more
        scalable, since we're no longer using HashSets.

        Currently, the way we track sets of registers is with a BitVector. Normally, we use the
        RegisterSet class, which wraps BitVector, so that we can add()/contains() on Reg's. But in
        the liveness analysis, everything gets turned into an index. So, we want to use BitVector
        directly. To do that, I needed to make the BitVector API look a bit more like a set API. I
        think that this is good, because the lack of set methods (add/remove/contains) has caused
        bugs in the past. This makes BitVector have methods both for set operations on bits and array
        operations on bits. I think that's good, since BitVector gets used in both contexts.

        * b3/B3IndexSet.h:
        (JSC::B3::IndexSet::Iterable::iterator::iterator):
        (JSC::B3::IndexSet::Iterable::begin):
        (JSC::B3::IndexSet::dump):
        * b3/air/AirInstInlines.h:
        (JSC::B3::Air::ForEach<Tmp>::forEach):
        (JSC::B3::Air::ForEach<Arg>::forEach):
        (JSC::B3::Air::ForEach<Reg>::forEach):
        (JSC::B3::Air::Inst::forEach):
        * b3/air/AirLiveness.h:
        (JSC::B3::Air::RegLivenessAdapter::RegLivenessAdapter):
        (JSC::B3::Air::RegLivenessAdapter::maxIndex):
        (JSC::B3::Air::RegLivenessAdapter::acceptsType):
        (JSC::B3::Air::RegLivenessAdapter::valueToIndex):
        (JSC::B3::Air::RegLivenessAdapter::indexToValue):
        * b3/air/AirReportUsedRegisters.cpp:
        (JSC::B3::Air::reportUsedRegisters):
        * jit/Reg.h:
        (JSC::Reg::next):
        (JSC::Reg::index):
        (JSC::Reg::maxIndex):
        (JSC::Reg::isSet):
        (JSC::Reg::operator bool):
        * jit/RegisterSet.h:
        (JSC::RegisterSet::forEach):

2016-01-10  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Make branchMul functional in ARM B3 and minor fixes
        https://bugs.webkit.org/show_bug.cgi?id=152889

        Reviewed by Mark Lam.

        ARM64 does not have a "S" version of MUL setting the flags.
        What we do is abstract that in the MacroAssembler. The problem
        is that form requires scratch registers.

        For simplicity, I just exposed the two scratch registers
        for Air. Filip already added the concept of Scratch role,
        all I needed was to expose it for opcodes.

        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::branchMul32):
        (JSC::MacroAssemblerARM64::branchMul64):
        Expose a version with the scratch registers as arguments.

        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::lower):
        Add the new form of CheckMul lowering.

        * b3/air/AirOpcode.opcodes:
        Expose the new BranchMuls.
        Remove all the Test variants that use immediates
        since Air can't handle those immediates correctly yet.

        * b3/air/opcode_generator.rb:
        Expose the Scratch role.

        * b3/testb3.cpp:
        (JSC::B3::testPatchpointLotsOfLateAnys):
        Ooops, the scratch registers were not clobbered. We were just lucky
        on x86.

2016-01-10  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] B3 is unable to do function calls on ARM64
        https://bugs.webkit.org/show_bug.cgi?id=152895

        Reviewed by Mark Lam.

        Apparently iOS does not follow the ARM64 ABI for function calls.
        Instead of giving each value a 8 bytes slot, it must be packed
        while preserving alignment.

        This patch adds a #ifdef to make function calls functional.

        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::marshallCCallArgument):
        (JSC::B3::Air::LowerToAir::lower):

2016-01-09  Filip Pizlo  <fpizlo@apple.com>

        Air should support Branch64 with immediates
        https://bugs.webkit.org/show_bug.cgi?id=152951

        Reviewed by Oliver Hunt.

        This doesn't significantly improve performance on any benchmarks, but it's great to get this
        obvious omission out of the way.

        * assembler/MacroAssemblerX86_64.h:
        (JSC::MacroAssemblerX86_64::branch64):
        * b3/air/AirOpcode.opcodes:
        * b3/testb3.cpp:
        (JSC::B3::testPowDoubleByIntegerLoop):
        (JSC::B3::testBranch64Equal):
        (JSC::B3::testBranch64EqualImm):
        (JSC::B3::testBranch64EqualMem):
        (JSC::B3::testBranch64EqualMemImm):
        (JSC::B3::zero):
        (JSC::B3::run):

2016-01-09  Dan Bernstein  <mitz@apple.com>

        [Cocoa] Allow overriding the frameworks directory independently of using a staging install path
        https://bugs.webkit.org/show_bug.cgi?id=152926

        Reviewed by Tim Horton.

        Introduce a new build setting, WK_OVERRIDE_FRAMEWORKS_DIR. When not empty, it determines
        where the frameworks are installed. Setting USE_STAGING_INSTALL_PATH to YES sets
        WK_OVERRIDE_FRAMEWORKS_DIR to $(SYSTEM_LIBRARY_DIR)/StagedFrameworks/Safari.

        Account for the possibility of WK_OVERRIDE_FRAMEWORKS_DIR containing spaces.

        * Configurations/Base.xcconfig:
        - Replace STAGED_FRAMEWORKS_SEARCH_PATH in FRAMEWORK_SEARCH_PATHS with
          WK_OVERRIDE_FRAMEWORKS_DIR and add quotes to account for spaces.
        - Define JAVASCRIPTCORE_FRAMEWORKS_DIR based on WK_OVERRIDE_FRAMEWORKS_DIR.
        * Configurations/JSC.xcconfig:
          Add quotes to account for spaces.
        * Configurations/ToolExecutable.xcconfig:
          Ditto.
        * postprocess-headers.sh:
          Ditto.

2016-01-09  Mark Lam  <mark.lam@apple.com>

        The FTL allocated spill slots for BinaryOps is sometimes inaccurate.
        https://bugs.webkit.org/show_bug.cgi?id=152918

        Reviewed by Filip Pizlo and Saam Barati.

        * ftl/FTLCompile.cpp:
        - Updated a comment.
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::lower):
        - The code to compute maxNumberOfCatchSpills was unnecessarily allocating an
          extra slot for BinaryOps that don't have Untyped operands, and failing to
          allocate that extra slot for some binary ops.  This is now fixed.

        * tests/stress/ftl-shr-exception.js:
        * tests/stress/ftl-xor-exception.js:
        - Un-skipped these tests.  They now pass with this patch.

2016-01-09  Andreas Kling  <akling@apple.com>

        Use NeverDestroyed instead of DEPRECATED_DEFINE_STATIC_LOCAL
        <https://webkit.org/b/152902>

        Reviewed by Anders Carlsson.

        Mostly mechanical conversion to NeverDestroyed throughout JavaScriptCore.

        * API/JSAPIWrapperObject.mm:
        (jsAPIWrapperObjectHandleOwner):
        * API/JSManagedValue.mm:
        (managedValueHandleOwner):
        * inspector/agents/InspectorDebuggerAgent.cpp:
        (Inspector::objectGroupForBreakpointAction):
        * jit/ExecutableAllocator.cpp:
        (JSC::DemandExecutableAllocator::allocators):

2016-01-08  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should do varargs tail calls and stack overflows
        https://bugs.webkit.org/show_bug.cgi?id=152934

        Reviewed by Saam Barati.

        I was trying to get tail-call-varargs-no-stack-overflow.js.ftl-no-cjit-validate to work and
        at first I hit the stack overflow issue and then I hit the varargs tail call issue. That's
        why I have two fixes in one change. Now the test passes.

        This reduces the number of failures from 13 to 0.

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::lower): Implement stack overflow handling.
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCallOrConstructVarargs): Varargs tail calls need to
        append an Oops (i.e. "unreachable").

2016-01-08  Filip Pizlo  <fpizlo@apple.com>

        B3 needs Neg()
        https://bugs.webkit.org/show_bug.cgi?id=152925

        Reviewed by Mark Lam.

        Previously we said that negation should be represented as Sub(0, x). That's wrong, since
        for floats, Sub(0, 0) == 0 while Neg(0) == -0.

        One way to solve this would be to say that anyone trying to say Neg(x) where x is a float
        should instead say BitXor(x, -0). That's actually correct, but I think that it would be odd
        to use bitops to represent floating point operations. Whatever cuteness this would have
        bought us would be outweighed by the annoyance of having to write code that matches
        Sub(0, x) for integer negation and BitXor(x, -0) for double negation. For example, this
        would mean strictly more code for anyone implementing a Neg(Neg(x))=>x strength reduction.
        Also, I suspect that the omission of Neg would cause others to make the mistake of using
        Sub to represent floating point negation.

        So, this introduces a proper Neg() opcode to B3. It's now the canonical way of saying
        negation for both ints and floats. For ints, we canonicalize Sub(0, x) to Neg(x). For
        floats, we lower it to BitXor(x, -0) on x86.

        This reduces the number of failures from 13 to 12.

        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::andFloat):
        (JSC::MacroAssemblerX86Common::xorDouble):
        (JSC::MacroAssemblerX86Common::xorFloat):
        (JSC::MacroAssemblerX86Common::convertInt32ToDouble):
        * b3/B3LowerMacrosAfterOptimizations.cpp:
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3Opcode.cpp:
        (WTF::printInternal):
        * b3/B3Opcode.h:
        * b3/B3ReduceStrength.cpp:
        * b3/B3Validate.cpp:
        * b3/B3Value.cpp:
        (JSC::B3::Value::effects):
        (JSC::B3::Value::key):
        (JSC::B3::Value::typeFor):
        * b3/air/AirOpcode.opcodes:
        * ftl/FTLB3Output.cpp:
        (JSC::FTL::Output::lockedStackSlot):
        (JSC::FTL::Output::neg):
        (JSC::FTL::Output::bitNot):
        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::chillDiv):
        (JSC::FTL::Output::mod):
        (JSC::FTL::Output::chillMod):
        (JSC::FTL::Output::doubleAdd):
        (JSC::FTL::Output::doubleSub):
        (JSC::FTL::Output::doubleMul):
        (JSC::FTL::Output::doubleDiv):
        (JSC::FTL::Output::doubleMod):
        (JSC::FTL::Output::doubleNeg):
        (JSC::FTL::Output::bitAnd):
        (JSC::FTL::Output::bitOr):
        (JSC::FTL::Output::neg): Deleted.
        * tests/stress/ftl-negate-zero.js: Added. This was already covered by op_negate but since
        it's such a glaring bug, I thought having a test for it specifically would be good.

2016-01-08  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 compile() doesn't clear exception handlers before we add FTL-specific ones
        https://bugs.webkit.org/show_bug.cgi?id=152922

        Reviewed by Saam Barati.

        FTL B3 was generating a handler table that first contained the old baseline handlers keyed
        by baseline's bytecode indices and then the FTL handlers keyed by FTL callsite index. That's
        wrong, since the FTL code block should not contain any baseline handlers. The fix is to
        clear the handlers before generation, sort of like FTL LLVM does.

        Also added some stuff to make it easier to inspect the handler table.

        This reduces the numbe rof failures from 25 to 13.

        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::dumpBytecode):
        (JSC::CodeBlock::dumpExceptionHandlers):
        (JSC::CodeBlock::beginDumpProfiling):
        * bytecode/CodeBlock.h:
        * ftl/FTLB3Compile.cpp:
        (JSC::FTL::compile):

2016-01-08  Filip Pizlo  <fpizlo@apple.com>

        B3 incorrectly turns NotEqual(bool, 1) into Equal(bool, 1) instead of Equal(bool, 0)
        https://bugs.webkit.org/show_bug.cgi?id=152916

        Reviewed by Mark Lam.

        This was causing a failure in an ancient DFG layout test. Thanks, ftl-eager-no-cjit!

        This reduces the number of failures from 27 to 25.

        * b3/B3ReduceStrength.cpp:

2016-01-08  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 allocateCell() should not crash
        https://bugs.webkit.org/show_bug.cgi?id=152909

        Reviewed by Mark Lam.

        This code was crashing in some tests that forced GC slow paths because it was stubbed out
        due to the use of undef. B3 doesn't have undef. In this case, there's no good reason to use
        undef. We can just use zero. Since the path is dead anyway in that case, we weren't gaining
        any LLVM optimizations by using undef.

        This reduces the number of failures from 35 to 27.

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::allocateCell):

2016-01-08  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 fails to realize that binary snippets might choose to omit their fast path
        https://bugs.webkit.org/show_bug.cgi?id=152901

        Reviewed by Mark Lam.

        This reduces the number of failures from 99 to 35.

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::emitBinarySnippet):

2016-01-08  Saam barati  <sbarati@apple.com>

        restoreCalleeSavesFromVMCalleeSavesBuffer should use the scratch register
        https://bugs.webkit.org/show_bug.cgi?id=152879

        Reviewed by Filip Pizlo.

        We were clobbering a register we needed when picking
        a scratch register inside an FTL OSR Exit.

        * dfg/DFGThunks.cpp:
        (JSC::DFG::osrEntryThunkGenerator):
        * jit/AssemblyHelpers.cpp:
        (JSC::AssemblyHelpers::emitRandomThunk):
        (JSC::AssemblyHelpers::restoreCalleeSavesFromVMCalleeSavesBuffer):
        * jit/AssemblyHelpers.h:
        (JSC::AssemblyHelpers::copyCalleeSavesFromFrameOrRegisterToVMCalleeSavesBuffer):
        (JSC::AssemblyHelpers::restoreCalleeSavesFromVMCalleeSavesBuffer): Deleted.
        * tests/stress/ftl-put-by-id-setter-exception-interesting-live-state.js:
        (foo):

2016-01-08  Mark Lam  <mark.lam@apple.com>

        Rolling out: Rename StringFromCharCode to StringFromSingleCharCode.
        https://bugs.webkit.org/show_bug.cgi?id=152897

        Not reviewed.

        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::handleIntrinsicCall):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGDoesGC.cpp:
        (JSC::DFG::doesGC):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGNodeType.h:
        * dfg/DFGOperations.cpp:
        * dfg/DFGOperations.h:
        * dfg/DFGPredictionPropagationPhase.cpp:
        (JSC::DFG::PredictionPropagationPhase::propagate):
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileFromCharCode):
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * runtime/StringConstructor.cpp:
        (JSC::stringFromCharCode):
        (JSC::stringFromSingleCharCode): Deleted.
        * runtime/StringConstructor.h:

2016-01-08  Per Arne Vollan  <peavo@outlook.com>

        [JSC] Use std::call_once instead of pthread_once when initializing LLVM.
        https://bugs.webkit.org/show_bug.cgi?id=152893

        Reviewed by Mark Lam.

        Use std::call_once since pthreads is not present on all platforms.

        * llvm/InitializeLLVM.cpp:
        (JSC::initializeLLVMImpl):
        (JSC::initializeLLVM):

2016-01-08  Mark Lam  <mark.lam@apple.com>

        Rename StringFromCharCode to StringFromSingleCharCode.
        https://bugs.webkit.org/show_bug.cgi?id=152897

        Reviewed by Daniel Bates.

        StringFromSingleCharCode is a better name because the intrinsic it represents
        only applies when we are converting from a single char code.  This is purely
        a refactoring patch.  There is no semantic change.

        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::handleIntrinsicCall):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGDoesGC.cpp:
        (JSC::DFG::doesGC):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGNodeType.h:
        * dfg/DFGOperations.cpp:
        * dfg/DFGOperations.h:
        * dfg/DFGPredictionPropagationPhase.cpp:
        (JSC::DFG::PredictionPropagationPhase::propagate):
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileFromCharCode):
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * runtime/StringConstructor.cpp:
        (JSC::stringFromCharCode):
        (JSC::stringFromSingleCharCode):
        * runtime/StringConstructor.h:

2016-01-08  Konstantin Tokarev  <annulen@yandex.ru>

        [mips] Fixed unused parameter warnings
        https://bugs.webkit.org/show_bug.cgi?id=152885

        Reviewed by Mark Lam.

        * jit/CCallHelpers.h:
        (JSC::CCallHelpers::setupArgumentsWithExecState):

2016-01-08  Konstantin Tokarev  <annulen@yandex.ru>

        [mips] Max value of immediate arg of logical ops is 0xffff
        https://bugs.webkit.org/show_bug.cgi?id=152884

        Reviewed by Michael Saboff.

        Replaced imm.m_value < 65535 checks with imm.m_value <= 65535

        * assembler/MacroAssemblerMIPS.h:
        (JSC::MacroAssemblerMIPS::and32):
        (JSC::MacroAssemblerMIPS::or32):

2016-01-08  Konstantin Tokarev  <annulen@yandex.ru>

        [mips] Add new or32 implementation after r194613
        https://bugs.webkit.org/show_bug.cgi?id=152865

        Reviewed by Michael Saboff.

        * assembler/MacroAssemblerMIPS.h:
        (JSC::MacroAssemblerMIPS::or32):

2016-01-07  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 lazy slow paths should do exceptions
        https://bugs.webkit.org/show_bug.cgi?id=152853

        Reviewed by Saam Barati.

        This reduces the number of JSC test failures to 97.

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::lazySlowPath):
        * tests/stress/ftl-new-negative-array-size.js: Added.
        (foo):

2016-01-07  Filip Pizlo  <fpizlo@apple.com>

        Unreviewed, skip more tests that fail.

        * tests/stress/ftl-shr-exception.js:
        (foo):
        * tests/stress/ftl-xor-exception.js:
        (foo):

2016-01-07  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 binary snippets should do exceptions
        https://bugs.webkit.org/show_bug.cgi?id=152852

        Reviewed by Saam Barati.

        This reduces the number of JSC test failures to 110.

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::emitBinarySnippet):
        (JSC::FTL::DFG::LowerDFGToLLVM::emitBinaryBitOpSnippet):
        (JSC::FTL::DFG::LowerDFGToLLVM::emitRightShiftSnippet):
        * tests/stress/ftl-shr-exception.js: Added.
        (foo):
        (result.foo.valueOf):
        * tests/stress/ftl-sub-exception.js: Added.
        (foo):
        (result.foo.valueOf):
        * tests/stress/ftl-xor-exception.js: Added.
        (foo):
        (result.foo.valueOf):

2016-01-07  Filip Pizlo  <fpizlo@apple.com>

        Unreviewed, skipping this test. Looks like LLVM can't handle this one, either.

        * tests/stress/ftl-call-varargs-bad-args-exception-interesting-live-state.js:
        (foo):

2016-01-07  Filip Pizlo  <fpizlo@apple.com>

        Unreviewed, skipping this test. Looks like LLVM can't handle it.

        * tests/stress/ftl-put-by-id-setter-exception-interesting-live-state.js:
        (foo):

2016-01-07  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 JS calls should do exceptions
        https://bugs.webkit.org/show_bug.cgi?id=152851

        Reviewed by Geoffrey Garen.

        This reduces the number of JSC test failures with FTL B3 to 111.

        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::emitCall):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCallOrConstruct):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileTailCall):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCallOrConstructVarargs):
        * tests/stress/ftl-call-bad-args-exception-interesting-live-state.js: Added.
        * tests/stress/ftl-call-bad-callee-exception-interesting-live-state.js: Added.
        * tests/stress/ftl-call-exception-interesting-live-state.js: Added.
        * tests/stress/ftl-call-exception-no-catch.js: Added.
        * tests/stress/ftl-call-exception.js: Added.
        * tests/stress/ftl-call-varargs-bad-callee-exception-interesting-live-state.js: Added.
        * tests/stress/ftl-call-varargs-exception-interesting-live-state.js: Added.
        * tests/stress/ftl-call-varargs-exception-no-catch.js: Added.
        * tests/stress/ftl-call-varargs-exception.js: Added.

2016-01-07  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 PutById should do exceptions
        https://bugs.webkit.org/show_bug.cgi?id=152850

        Reviewed by Saam Barati.

        Implemented PutById exception handling by following the idiom used in GetById. Reduces the
        number of JSC test failures to 128.

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compilePutById):
        * tests/stress/ftl-put-by-id-setter-exception-interesting-live-state.js: Added.
        * tests/stress/ftl-put-by-id-setter-exception-no-catch.js: Added.
        * tests/stress/ftl-put-by-id-setter-exception.js: Added.
        * tests/stress/ftl-put-by-id-slow-exception-interesting-live-state.js: Added.
        * tests/stress/ftl-put-by-id-slow-exception-no-catch.js: Added.
        * tests/stress/ftl-put-by-id-slow-exception.js: Added.

2016-01-07  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r194714.
        https://bugs.webkit.org/show_bug.cgi?id=152864

        it broke many JSC tests when FTL B3 is enabled (Requested by
        pizlo on #webkit).

        Reverted changeset:

        "[JSC] When resolving Stack arguments, use addressing from SP
        when addressing from FP is invalid"
        https://bugs.webkit.org/show_bug.cgi?id=152840
        http://trac.webkit.org/changeset/194714

2016-01-07  Konstantin Tokarev  <annulen@yandex.ru>

        [mips] Lower immediates of logical operations.
        https://bugs.webkit.org/show_bug.cgi?id=152693

        On MIPS immediate operands of andi, ori, and xori are required to be 16-bit
        non-negative numbers.

        Reviewed by Michael Saboff.

        * offlineasm/mips.rb:

2016-01-07  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Update testCheckSubBadImm() for ARM64
        https://bugs.webkit.org/show_bug.cgi?id=152846

        Reviewed by Mark Lam.

        * b3/testb3.cpp:
        (JSC::B3::testCheckSubBadImm):
        The test was assuming the constant can always be used
        as immediate. That's obviously not the case on ARM64.

2016-01-07  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 getById() should do exceptions
        https://bugs.webkit.org/show_bug.cgi?id=152810

        Reviewed by Saam Barati.

        This adds abstractions for doing exceptions from patchpoints, and uses them to implement
        exceptions from GetById. This covers all of the following ways that a GetById might throw an
        exceptions:

        - Throw without try/catch from the vmCall() in a GetById(Untyped:)
        - Throw with try/catch from the vmCall() in a GetById(Untyped:)
        - Throw without try/catch from the callOperation() in the patchpoint of a GetById
        - Throw with try/catch from the callOperation() in the patchpoint of a GetById
        - Throw without try/catch from the Call IC generated in the patchpoint of a GetById
        - Throw with try/catch from the Call IC generated in the patchpoint of a GetById

        This requires having a default exception target in FTL-generated code, and ensuring that this
        target is generated regardless of whether we have branches to the B3 basic block of the
        default exception target. This also requires adding some extra arguments to a
        PatchpointValue, and then knowing that the arguments are used for OSR exit and not anything
        else. This also requires associating the CallSiteIndex of the patchpoint with the register
        set used for exit and with the OSR exit label for the unwind exit.

        All of the stuff that you have to worry about when wiring a patchpoint to exception handling
        is covered by the new PatchpointExceptionHandle object. You create one by calling
        preparePatchpointForExceptions(). This sets up the B3 IR representation of the patchpoint
        with stackmap arguments for the exceptional exit, and creates a PatchpointExceptionHandle
        object that can be used to create zero or more actual OSR exits. It can create both OSR exits
        for operation calls and OSR exits for unwind. You call the
        PatchpointExceptionHandle::scheduleExitCreationXXX() methods from the generator callback to
        actually get OSR exits.

        This API makes heavy use of Box<>, late paths, and link tasks. For example, you can use the
        PatchpointExceptionHandle to get a Box<JumpList> that you can append exception jumps to. When
        you use this API, it automatically registers a link task that will link the JumpList to the
        actual OSR exit label.

        This API is very flexible about how you get to the label of the OSR exit. You are encouraged
        to use the Box<JumpList> approach, but if you really just need the label, you can also get
        a RefPtr<ExceptionTarget> and rely on the fact that the ExceptionTarget object will be able
        to vend you the OSR exit label at link-time.

        This reduces the number of JSC test failures with FTL B3 from 186 to 133. It also adds a
        bunch of new tests specifically for all of the ways you might throw from GetById, and B3
        passes all of these new tests. Note that I'm not counting the new tests as part of the
        previous 186 test failures (FTL B3 failed all of the new tests prior to this change).

        After this change, it should be easy to make all of the other patchpoints also handle
        exceptions by just following the preparePatchpointForExceptions() idiom.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/B3StackmapValue.h:
        * b3/B3ValueRep.cpp:
        (JSC::B3::ValueRep::addUsedRegistersTo):
        (JSC::B3::ValueRep::usedRegisters):
        (JSC::B3::ValueRep::dump):
        * b3/B3ValueRep.h:
        (JSC::B3::ValueRep::doubleValue):
        (JSC::B3::ValueRep::withOffset):
        (JSC::B3::ValueRep::usedRegisters):
        * ftl/FTLB3Compile.cpp:
        (JSC::FTL::compile):
        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::unreachable):
        (JSC::FTL::Output::speculate):
        * ftl/FTLExceptionTarget.cpp: Added.
        (JSC::FTL::ExceptionTarget::~ExceptionTarget):
        (JSC::FTL::ExceptionTarget::label):
        (JSC::FTL::ExceptionTarget::jumps):
        (JSC::FTL::ExceptionTarget::ExceptionTarget):
        * ftl/FTLExceptionTarget.h: Added.
        * ftl/FTLJITCode.cpp:
        (JSC::FTL::JITCode::liveRegistersToPreserveAtExceptionHandlingCallSite):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::lower):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithAddOrSub):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithMul):
        (JSC::FTL::DFG::LowerDFGToLLVM::compilePutById):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileMakeRope):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCallOrConstructVarargs):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileIn):
        (JSC::FTL::DFG::LowerDFGToLLVM::getById):
        (JSC::FTL::DFG::LowerDFGToLLVM::emitBinarySnippet):
        (JSC::FTL::DFG::LowerDFGToLLVM::emitBinaryBitOpSnippet):
        (JSC::FTL::DFG::LowerDFGToLLVM::emitRightShiftSnippet):
        (JSC::FTL::DFG::LowerDFGToLLVM::callCheck):
        (JSC::FTL::DFG::LowerDFGToLLVM::preparePatchpointForExceptions):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExitArgumentsForPatchpointIfWillCatchException):
        (JSC::FTL::DFG::LowerDFGToLLVM::lowBlock):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExit):
        (JSC::FTL::DFG::LowerDFGToLLVM::blessSpeculation):
        * ftl/FTLPatchpointExceptionHandle.cpp: Added.
        (JSC::FTL::PatchpointExceptionHandle::create):
        (JSC::FTL::PatchpointExceptionHandle::defaultHandle):
        (JSC::FTL::PatchpointExceptionHandle::~PatchpointExceptionHandle):
        (JSC::FTL::PatchpointExceptionHandle::scheduleExitCreation):
        (JSC::FTL::PatchpointExceptionHandle::scheduleExitCreationForUnwind):
        (JSC::FTL::PatchpointExceptionHandle::PatchpointExceptionHandle):
        (JSC::FTL::PatchpointExceptionHandle::createHandle):
        * ftl/FTLPatchpointExceptionHandle.h: Added.
        * ftl/FTLState.cpp:
        * ftl/FTLState.h:
        (JSC::FTL::verboseCompilationEnabled):
        * tests/stress/ftl-get-by-id-getter-exception-interesting-live-state.js: Added.
        * tests/stress/ftl-get-by-id-getter-exception-no-catch.js: Added.
        * tests/stress/ftl-get-by-id-getter-exception.js: Added.
        * tests/stress/ftl-get-by-id-slow-exception-interesting-live-state.js: Added.
        * tests/stress/ftl-get-by-id-slow-exception-no-catch.js: Added.
        * tests/stress/ftl-get-by-id-slow-exception.js: Added.
        * tests/stress/ftl-operation-exception-interesting-live-state.js: Added.
        * tests/stress/ftl-operation-exception-no-catch.js: Added.

2016-01-07  Konstantin Tokarev  <annulen@yandex.ru>

        [mips] Implemented missing branch patching methods.
        https://bugs.webkit.org/show_bug.cgi?id=152845

        Reviewed by Michael Saboff.

        * assembler/MacroAssemblerMIPS.h:
        (JSC::MacroAssemblerMIPS::canJumpReplacePatchableBranch32WithPatch):
        (JSC::MacroAssemblerMIPS::startOfPatchableBranch32WithPatchOnAddress):
        (JSC::MacroAssemblerMIPS::revertJumpReplacementToPatchableBranch32WithPatch):

2016-01-07  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] When resolving Stack arguments, use addressing from SP when addressing from FP is invalid
        https://bugs.webkit.org/show_bug.cgi?id=152840

        Reviewed by Mark Lam.

        ARM64 has two kinds of addressing with immediates:
        -Signed 9bits direct (really only -256 to 255).
        -Unsigned 12bits scaled by the load/store size.

        When resolving the stack addresses, we easily run
        past -256 bytes from FP. Addressing from SP gives us more
        room to address the stack efficiently because we can
        use unsigned immediates.

        * b3/B3StackmapSpecial.cpp:
        (JSC::B3::StackmapSpecial::repForArg):
        * b3/air/AirAllocateStack.cpp:
        (JSC::B3::Air::allocateStack):

2016-01-07  Konstantin Tokarev  <annulen@yandex.ru>

        [mips] Make repatchCall public to fix compilation.
        https://bugs.webkit.org/show_bug.cgi?id=152843

        Reviewed by Michael Saboff.

        * assembler/MacroAssemblerMIPS.h:
        (JSC::MacroAssemblerMIPS::repatchCall):
        (JSC::MacroAssemblerMIPS::linkCall): Deleted.

2016-01-07  Konstantin Tokarev  <annulen@yandex.ru>

        [mips] Replaced subi with addi in getHostCallReturnValue
        https://bugs.webkit.org/show_bug.cgi?id=152841

        Reviewed by Michael Saboff.

        MIPS architecture does not have subi instruction, addi with negative
        number should be used instead.

        * jit/JITOperations.cpp:

2016-01-07  Mark Lam  <mark.lam@apple.com>

        ARMv7 or32(TrustedImm32, AbsoluteAddress) may have a bug with its use of dataTempRegister.
        https://bugs.webkit.org/show_bug.cgi?id=152833

        Reviewed by Michael Saboff.

        Follow-up patch to fix illegal use of memoryTempRegister as the src for ARM64's
        store32.

        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::or32):
        (JSC::MacroAssemblerARM64::store):

2016-01-07  Konstantin Tokarev  <annulen@yandex.ru>

        [mips] GPRInfo::toArgumentRegister missing
        https://bugs.webkit.org/show_bug.cgi?id=152838

        Reviewed by Michael Saboff.

        * jit/GPRInfo.h:
        (JSC::GPRInfo::toArgumentRegister):

2016-01-07  Mark Lam  <mark.lam@apple.com>

        ARMv7 or32(TrustedImm32, AbsoluteAddress) may have a bug with its use of dataTempRegister.
        https://bugs.webkit.org/show_bug.cgi?id=152833

        Reviewed by Benjamin Poulain.

        * assembler/MacroAssemblerARM.h:
        (JSC::MacroAssemblerARM::or32):
        - Added some assertions to make sure it is safe to use ARMRegisters::S0 as a temp.
        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::or32):
        - Implement an optimization that avoids reloading the memoryTempRegister when
          the immediate is encodable as an instruction immediate.
        * assembler/MacroAssemblerARMv7.h:
        (JSC::MacroAssemblerARMv7::or32):
        - Added an assertion to make sure it is safe to use the dataTempRegister as a temp.
        - Implement an optimization that avoids reloading the memoryTempRegister when
          the immediate is encodable as an instruction immediate.  In the event that we
          cannot encode the immediate, we'll use the addressTempRegister as a temp, and
          reload it later.

2016-01-07  Konstantin Tokarev  <annulen@yandex.ru>

        [CMake] JSC shell sources should include JavaScriptCore_SYSTEM_INCLUDE_DIRECTORIES
        https://bugs.webkit.org/show_bug.cgi?id=152664

        Reviewed by Alex Christensen.

        * shell/CMakeLists.txt:

2016-01-06  Joseph Pecoraro  <pecoraro@apple.com>

        Web Inspector: CRASH Attempting to pause on CSP violation not inside of script
        https://bugs.webkit.org/show_bug.cgi?id=152825
        <rdar://problem/24021276>

        Reviewed by Timothy Hatcher.

        * debugger/Debugger.cpp:
        (JSC::Debugger::breakProgram):
        We cannot pause if we are not evaluating JavaScript, so bail.

2016-01-07  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Re-enable lea() in Air on ARM64
        https://bugs.webkit.org/show_bug.cgi?id=152832

        Reviewed by Michael Saboff.

        Lea() on the MacroAssembler is not the full x86 Lea (the real one being
        x86Lea32()). Instead, it is a addPtr() with SP and a constant.

        The instruction is required to implement B3's StackSlot. It is not
        safe for big offsets but none of the stack operations are at the moment.

        * b3/air/AirOpcode.opcodes:

2016-01-07  Julien Brianceau  <jbriance@cisco.com>

        [mips] Add two missing abortWithReason implementations
        https://bugs.webkit.org/show_bug.cgi?id=136753

        Reviewed by Benjamin Poulain.

        * assembler/MacroAssemblerMIPS.h:
        (JSC::MacroAssemblerMIPS::memoryFence):
        (JSC::MacroAssemblerMIPS::abortWithReason):
        (JSC::MacroAssemblerMIPS::readCallTarget):

2016-01-07  Csaba Osztrogonác  <ossy@webkit.org>

        Add new or32 implementation to MacroAssemblerARM after r194613
        https://bugs.webkit.org/show_bug.cgi?id=152784

        Reviewed by Benjamin Poulain.

        * assembler/MacroAssemblerARM.h:
        (JSC::MacroAssemblerARM::or32):

2016-01-06  Mark Lam  <mark.lam@apple.com>

        REGRESSION(r194613): JITMulGenerator needs a scratch GPR on 32-bit too.
        https://bugs.webkit.org/show_bug.cgi?id=152805

        Reviewed by Michael Saboff.

        There aren't enough registers on x86 32-bit to allocate the needed scratch GPR.
        So, we'll continue to use one of the result registers as the scratch, and
        re-compute the result at the end.

        * jit/JITMulGenerator.cpp:
        (JSC::JITMulGenerator::generateFastPath):

2016-01-06  Anders Carlsson  <andersca@apple.com>

        Add a smart block pointer
        https://bugs.webkit.org/show_bug.cgi?id=152799

        Reviewed by Tim Horton.

        Get rid of RemoteTargetBlock and replace it with WTF::BlockPtr<void ()>.

        * inspector/remote/RemoteConnectionToTarget.h:
        (Inspector::RemoteTargetBlock::RemoteTargetBlock): Deleted.
        (Inspector::RemoteTargetBlock::~RemoteTargetBlock): Deleted.
        (Inspector::RemoteTargetBlock::operator=): Deleted.
        (Inspector::RemoteTargetBlock::operator()): Deleted.
        * inspector/remote/RemoteConnectionToTarget.mm:
        (Inspector::RemoteTargetQueueTaskOnGlobalQueue):
        (Inspector::RemoteConnectionToTarget::queueTaskOnPrivateRunLoop):

2016-01-06  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] More B3 tests passing on ARM64
        https://bugs.webkit.org/show_bug.cgi?id=152787

        Reviewed by Michael Saboff.

        Some more minor bugs.

        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::urshift64):
        The offset was being truncated. That code was just copied
        from the 32bits version of urshift.

        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::createGenericCompare):
        Very few instructions can encode -1 as immediate.
        TST certainly can't. The fallback works for ARM.

        * b3/air/AirOpcode.opcodes:
        Bit instructions have very specific immediate encoding.
        B3 cannot express that properly yet. I disabled those
        forms for now. Immediates encoding is something we'll really 
        have to look into at some point for B3 ARM64.

2016-01-06  Michael Catanzaro  <mcatanzaro@igalia.com>

        Silence -Wtautological-compare
        https://bugs.webkit.org/show_bug.cgi?id=152768

        Reviewed by Saam Barati.

        * runtime/Options.cpp:
        (JSC::Options::setAliasedOption):

2016-01-06  Filip Pizlo  <fpizlo@apple.com>

        Make sure that the basic throw-from-operation mode of throwing makes sense in FTL B3
        https://bugs.webkit.org/show_bug.cgi?id=152798

        Reviewed by Oliver Hunt.

        This really just contains one change: we inline emitBranchToOSRExitIfWillCatchException()
        into callCheck(), since that was its only caller. This makes it a bit more clear what is
        going on.

        It turns out that FTL B3 already handled this case properly. I added a test that I believe
        illustrates this. Note that although the test uses GetById, which ordinarily throws
        exceptions from inside a patchpoint, it uses it in such a way that the exception is thrown
        from the operation call for the non-cell bypass path of a GetById(UntypedUse:).

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::callCheck):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExitArgumentsForPatchpointIfWillCatchException):
        (JSC::FTL::DFG::LowerDFGToLLVM::lowBlock):
        (JSC::FTL::DFG::LowerDFGToLLVM::emitBranchToOSRExitIfWillCatchException): Deleted.
        * tests/stress/ftl-operation-exception.js: Added.
        (foo):

2016-01-06  Joseph Pecoraro  <pecoraro@apple.com>

        Web Inspector: Remove duplicate check
        https://bugs.webkit.org/show_bug.cgi?id=152792

        Reviewed by Timothy Hatcher.

        * inspector/InjectedScriptSource.js:
        (InjectedScript.RemoteObject.prototype._generatePreview): Deleted.
        This method is only called from one place, and it does an equivalent
        check before calling this function. Remove the duplicate check.

2016-01-06  Brian Burg  <bburg@apple.com>

        Add a WebKit SPI for registering an automation controller with RemoteInspector
        https://bugs.webkit.org/show_bug.cgi?id=151576

        Reviewed by Dan Bernstein and Joseph Pecoraro.

        Given a RemoteInspector endpoint that is instantiated in UIProcess, there
        should be a way to delegate automation-related functionality and policy to
        clients of WebKit.

        This class adds a RemoteInspector::Client interface that serves a delegate.
        This is ultimately delegated via _WKAutomationDelegate, which is an SPI
        that allows clients to install an Objective-C delegate for automation.

        The setting for whether remote automation is allowed is included in the
        listing that RemoteInspector sends out. It is updated when RemoteInspector::Client
        is assigned, or when the client signals that its capabilities have changed.

        * inspector/remote/RemoteInspector.h:
        * inspector/remote/RemoteInspector.mm:
        (Inspector::RemoteInspector::setRemoteInspectorClient): Added.
        (Inspector::RemoteInspector::pushListingsNow):

            In the listing, include whether the application supports remote automation.

        * inspector/remote/RemoteInspectorConstants.h: Add a constant.

2016-01-05  Keith Miller  <keith_miller@apple.com>

        [ES6] Boolean, Number, Map, RegExp, and Set should be subclassable
        https://bugs.webkit.org/show_bug.cgi?id=152765

        Reviewed by Michael Saboff.

        This patch enables subclassing of five more builtins: Boolean, Number, Map, RegExp, and Set.

        * runtime/BooleanConstructor.cpp:
        (JSC::constructWithBooleanConstructor):
        (JSC::constructBoolean): Deleted.
        * runtime/BooleanConstructor.h:
        * runtime/MapConstructor.cpp:
        (JSC::constructMap):
        * runtime/NumberConstructor.cpp:
        (JSC::constructWithNumberConstructor):
        * runtime/RegExpConstructor.cpp:
        (JSC::getRegExpStructure):
        (JSC::constructRegExp):
        * runtime/SetConstructor.cpp:
        (JSC::constructSet):
        * tests/es6.yaml:
        * tests/stress/class-subclassing-misc.js: Added.
        (B):
        (N):
        (M):
        (R):
        (S):
        (test):

2016-01-06  Julien Brianceau  <jbriance@cisco.com>

        [mips] Fix branchTruncateDoubleToUint32 implementation in macro assembler
        https://bugs.webkit.org/show_bug.cgi?id=152782

        Reviewed by Benjamin Poulain.

        Already covered by LayoutTests/js/dfg-uint32array-overflow-values test.

        * assembler/MacroAssemblerMIPS.h:
        (JSC::MacroAssemblerMIPS::branchTruncateDoubleToUint32):

2016-01-06  Julien Brianceau  <jbriance@cisco.com>

        [mips] Fix or32 implementation in macro assembler
        https://bugs.webkit.org/show_bug.cgi?id=152781

        Reviewed by Michael Saboff.

        * assembler/MacroAssemblerMIPS.h:
        (JSC::MacroAssemblerMIPS::or32):

2016-01-06  Julien Brianceau  <jbriance@cisco.com>

        [mips] Add missing branchAdd32 implementation in macro assembler
        https://bugs.webkit.org/show_bug.cgi?id=152785

        Reviewed by Michael Saboff.

        * assembler/MacroAssemblerMIPS.h:
        (JSC::MacroAssemblerMIPS::branchAdd32):

2016-01-06  Andy VanWagoner  <thetalecrafter@gmail.com>

        [ES6] Date.prototype should be a plain object
        https://bugs.webkit.org/show_bug.cgi?id=152574

        Reviewed by Benjamin Poulain.

        * runtime/DateConstructor.cpp:
        (JSC::DateConstructor::finishCreation):
        * runtime/DatePrototype.cpp:
        (JSC::DatePrototype::DatePrototype):
        * runtime/DatePrototype.h:
        * tests/mozilla/mozilla-tests.yaml: Expect errors from old Date.prototype as Date instance tests.

2016-01-06  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Get more of testb3 to pass on ARM64
        https://bugs.webkit.org/show_bug.cgi?id=152737

        Reviewed by Geoffrey Garen.

        A bunch of minor bugs and missing function to make most of testb3
        run on ARM64.

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * assembler/ARM64Assembler.h:
        (JSC::ARM64Assembler::canEncodePImmOffset):
        (JSC::ARM64Assembler::canEncodeSImmOffset):
        (JSC::isInt9): Deleted.
        (JSC::isUInt12): Deleted.
        * assembler/ARMv7Assembler.h:
        * assembler/AssemblerCommon.h: Added.
        (JSC::isInt9):
        (JSC::isUInt12):
        (JSC::isValidScaledUImm12):
        (JSC::isValidSignedImm9):
        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::load16SignedExtendTo32):
        (JSC::MacroAssemblerARM64::load8SignedExtendTo32):
        (JSC::MacroAssemblerARM64::store16):
        (JSC::MacroAssemblerARM64::absFloat):
        (JSC::MacroAssemblerARM64::loadFloat):
        (JSC::MacroAssemblerARM64::storeFloat):
        (JSC::MacroAssemblerARM64::loadSignedAddressedByUnsignedImmediate):
        (JSC::MacroAssemblerARM64::loadSignedAddressedByUnscaledImmediate):
        (JSC::MacroAssemblerARM64::tryLoadSignedWithOffset):
        (JSC::MacroAssemblerARM64::loadSignedAddressedByUnsignedImmediate<8>):
        (JSC::MacroAssemblerARM64::loadSignedAddressedByUnsignedImmediate<16>):
        (JSC::MacroAssemblerARM64::loadSignedAddressedByUnscaledImmediate<8>):
        (JSC::MacroAssemblerARM64::loadSignedAddressedByUnscaledImmediate<16>):
        * assembler/X86Assembler.h:
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::effectiveAddr):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/air/AirArg.h:
        (JSC::B3::Air::Arg::isValidImmForm):
        (JSC::B3::Air::Arg::isValidAddrForm):
        (JSC::B3::Air::Arg::isValidForm):
        * b3/air/AirOpcode.opcodes:

2016-01-05  Zan Dobersek  <zdobersek@igalia.com>

        [CMake] Remove USE_UDIS86 variable
        https://bugs.webkit.org/show_bug.cgi?id=152731

        Reviewed by Gyuyoung Kim.

        * CMakeLists.txt: Unconditionally build the Udis86-specific files.

2016-01-05  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 fails cdjs-tests.yaml/red_black_tree_test.js.ftl-eager-no-cjit
        https://bugs.webkit.org/show_bug.cgi?id=152770

        Reviewed by Mark Lam.

        It turns out that liveness didn't know that the return value GPR or FPR is live at the
        return. Consequently, we can end up with code that clobbers the return value register after
        the move of the return value into that register. This could happen if we start with
        something like:

            Move 42(%tmp1), %tmp2
            Move 50(%tmp1), %tmp3
            Move %tmp3, 58(%tmp1)
            Move %tmp2, %rax
            Ret

        Then we might coalesce %tmp2 with %rax:

            Move 42(%tmp1), %rax
            Move 50(%tmp1), %tmp3
            Move %tmp3, 58(%tmp1)
            Ret

        But now there is no use of %rax after that first instruction, so %rax appears dead at the
        other two Move's. So, the register allocator could then do this:

            Move 42(%tmp1), %rax
            Move 50(%tmp1), %rax
            Move %rax, 58(%tmp1)
            Ret

        And that's clearly wrong. This patch solves this issue by replacing the old Ret instruction
        with Ret32, Ret64, RetFloat, and RetDouble. These all take the return value register as an
        argument. They also tell Air which parts of the return value register the caller will
        observe. That's great for width analysis.

        This resolves a test failure in the CDjs red_black_tree_test. This reduces the total number
        of JSC test failures from 217 to 191.

        * assembler/MacroAssembler.h:
        (JSC::MacroAssembler::oops):
        (JSC::MacroAssembler::ret32):
        (JSC::MacroAssembler::ret64):
        (JSC::MacroAssembler::retFloat):
        (JSC::MacroAssembler::retDouble):
        (JSC::MacroAssembler::shouldConsiderBlinding):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::lower):
        * b3/air/AirGenerate.cpp:
        (JSC::B3::Air::generate):
        * b3/air/AirHandleCalleeSaves.cpp:
        (JSC::B3::Air::handleCalleeSaves):
        * b3/air/AirOpcode.opcodes:
        * b3/air/opcode_generator.rb:

2016-01-05  Keith Miller  <keith_miller@apple.com>

        Unreviewed build fix. A symbol was being exported that should not have been.

        * runtime/Structure.h:

2016-01-05  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r194603.
        https://bugs.webkit.org/show_bug.cgi?id=152762

        This change introduced JSC test failures (Requested by
        ryanhaddad on #webkit).

        Reverted changeset:

        "[ES6] Date.prototype should be a plain object"
        https://bugs.webkit.org/show_bug.cgi?id=152574
        http://trac.webkit.org/changeset/194603

2016-01-05  Filip Pizlo  <fpizlo@apple.com>

        stress/v8-crypto-strict.js.ftl-eager-no-cjit in FTL B3 fails with an assertion in the callframe shuffler
        https://bugs.webkit.org/show_bug.cgi?id=152756

        Reviewed by Saam Barati.

        This fixes a really obvious and dumb tail call bug in FTL B3. I think that tail calls work
        for real now. I have no idea why I got any tail call tests to pass before this fix.

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileTailCall):

2016-01-04  Mark Lam  <mark.lam@apple.com>

        Profiling should detect when multiplication overflows but does not create negative zero.
        https://bugs.webkit.org/show_bug.cgi?id=132470

        Reviewed by Geoffrey Garen.

        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::or32):
        * assembler/MacroAssemblerARMv7.h:
        (JSC::MacroAssemblerARMv7::or32):
        - New or32 emitter needed by the mul snippet.

        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::resultProfileForBytecodeOffset):
        (JSC::CodeBlock::updateResultProfileForBytecodeOffset): Deleted.
        * bytecode/CodeBlock.h:
        (JSC::CodeBlock::ensureResultProfile):
        (JSC::CodeBlock::addResultProfile): Deleted.
        (JSC::CodeBlock::likelyToTakeDeepestSlowCase): Deleted.
        - Added a m_bytecodeOffsetToResultProfileIndexMap because we can now add result
          profiles in any order (based on runtime execution), not necessarily in bytecode
          order at baseline compilation time.

        * bytecode/ValueProfile.cpp:
        (WTF::printInternal):
        * bytecode/ValueProfile.h:
        (JSC::ResultProfile::didObserveInt52Overflow):
        (JSC::ResultProfile::setObservedInt52Overflow):
        - Add new Int52Overflow flags.

        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::makeSafe):
        - Now with more straightforward mapping of profiling info.

        * dfg/DFGCommon.h:
        - Fixed a typo in a comment.

        * dfg/DFGNode.h:
        (JSC::DFG::Node::arithNodeFlags):
        (JSC::DFG::Node::mayHaveNonIntResult):
        (JSC::DFG::Node::hasConstantBuffer):
        * dfg/DFGNodeFlags.cpp:
        (JSC::DFG::dumpNodeFlags):
        * dfg/DFGNodeFlags.h:
        (JSC::DFG::nodeMayOverflowInt52):
        (JSC::DFG::nodeCanSpeculateInt52):
        * dfg/DFGPredictionPropagationPhase.cpp:
        (JSC::DFG::PredictionPropagationPhase::propagate):
        - We now have profiling info for whether the result was ever seen to be a non-Int.
          Use this to make a better prediction.

        * jit/JITArithmetic.cpp:
        (JSC::JIT::emit_op_div):
        (JSC::JIT::emit_op_mul):
        - Switch to using CodeBlock::ensureResultProfile().  ResultProfiles can now be
          created at any time (including the slow path), not just in bytecode order
          during baseline compilation.

        * jit/JITMulGenerator.cpp:
        (JSC::JITMulGenerator::generateFastPath):
        - Removed the fast path profiling code for NegZero because we'll go to the slow
          path anyway.  Let the slow path do the profiling for us.
        - Added profiling for NegZero and potential Int52 overflows in the fast path
          that does double math.

        * runtime/CommonSlowPaths.cpp:
        (JSC::updateResultProfileForBinaryArithOp):
        - Removed the RETURN_WITH_RESULT_PROFILING macro (2 less macros), and just use
          the RETURN_WITH_PROFILING macro instead with a call to
          updateResultProfileForBinaryArithOp().  This makes it clear what we're doing
          to do profiling in each case, and also allows us to do custom profiling for
          each opcode if needed.  However, so far, we always call
          updateResultProfileForBinaryArithOp().

2016-01-05  Keith Miller  <keith_miller@apple.com>

        [ES6] Arrays should be subclassable.
        https://bugs.webkit.org/show_bug.cgi?id=152706

        Reviewed by Benjamin Poulain.

        This patch enables full subclassing of Arrays. We do this by fetching the new.target's prototype property
        in the Array constructor and transitioning the old structure to have the new prototype. This method has
        two downsides. The first is that we clobber the transition watchpoint on the base structure. The second,
        which is currently very significant but should be fixed in a future patch, is that we allocate a new
        structure for each new derived class we allocate.

        * runtime/ArrayConstructor.cpp:
        (JSC::constructArrayWithSizeQuirk):
        (JSC::constructWithArrayConstructor):
        (JSC::callArrayConstructor):
        * runtime/ArrayConstructor.h:
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::arrayStructureForIndexingTypeDuringAllocation):
        (JSC::JSGlobalObject::arrayStructureForProfileDuringAllocation):
        (JSC::constructEmptyArray):
        (JSC::constructArray):
        (JSC::constructArrayNegativeIndexed):
        * runtime/PrototypeMap.h:
        * runtime/Structure.h:
        * runtime/StructureInlines.h:
        (JSC::Structure::createSubclassStructure):
        * tests/es6.yaml:
        * tests/stress/class-subclassing-array.js: Added.
        (A):
        (B.prototype.get 1):
        (B):
        (C):
        (test):

2016-01-05  Filip Pizlo  <fpizlo@apple.com>

        regress/script-tests/deltablue-varargs.js.ftl-no-cjit-no-put-stack-validate on FTL B3 gets a B3 validation failure
        https://bugs.webkit.org/show_bug.cgi?id=152754

        Reviewed by Geoffrey Garen and Saam Barati.

        It turns out that the FTL was creating orphans. Rather than making the FTL handle them by
        itself, I gave B3 the power to eliminate them for you. I also made the dumper print them
        since otherwise, you wouldn't know anything about the orphan when looking at a validation
        failure or other kind of procedure dump.

        * b3/B3IndexSet.h:
        (JSC::B3::IndexSet::add):
        (JSC::B3::IndexSet::addAll):
        (JSC::B3::IndexSet::remove):
        * b3/B3Procedure.cpp:
        (JSC::B3::Procedure::dump):
        (JSC::B3::Procedure::deleteValue):
        (JSC::B3::Procedure::deleteOrphans):
        (JSC::B3::Procedure::dominators):
        * b3/B3Procedure.h:
        (JSC::B3::Procedure::cfg):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::lower):

2015-12-24  Mark Lam  <mark.lam@apple.com>

        Re-landing: Add validation of JSC options to catch typos.
        https://bugs.webkit.org/show_bug.cgi?id=152549

        Reviewed by Benjamin Poulain.

        1. If a JSC_xxx option is found and xxx is not a valid option, we will now log
           an error message.
        2. If a --xxx jsc option is specified, but xxx is not a valid option, we will
           now log an error message.
        3. Added JSC_validateOptions, which if set to true will cause the VM to crash if
           an invalid option was seen during options parsing.

        In this version for re-landing, I removed the change where I disallowed -- options
        after the script name.  Apparently, we have some test harnesses that do append the
        -- options after the script name.

        * jsc.cpp:
        (CommandLine::parseArguments):
        * runtime/Options.cpp:
        (JSC::Options::initialize):
        * runtime/Options.h:

2016-01-05  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should do ArithNegate
        https://bugs.webkit.org/show_bug.cgi?id=152745

        Reviewed by Geoffrey Garen.

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithNegate):

2016-01-05  Andy VanWagoner  <thetalecrafter@gmail.com>

        [ES6] Date.prototype should be a plain object
        https://bugs.webkit.org/show_bug.cgi?id=152574

        Reviewed by Benjamin Poulain.

        * runtime/DateConstructor.cpp:
        (JSC::DateConstructor::finishCreation):
        * runtime/DatePrototype.cpp:
        (JSC::DatePrototype::DatePrototype):
        * runtime/DatePrototype.h:

2016-01-05  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r194590.
        https://bugs.webkit.org/show_bug.cgi?id=152751

        "Causes bot failures" (Requested by mlam on #webkit).

        Reverted changeset:

        "Add validation of JSC options to catch typos."
        https://bugs.webkit.org/show_bug.cgi?id=152549
        http://trac.webkit.org/changeset/194590

2016-01-05  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should do In
        https://bugs.webkit.org/show_bug.cgi?id=152744

        Reviewed by Michael Saboff.

        This was easy; I just used the same idiom that we already established for ICs in FTL B3.

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileIn):

2016-01-05  Filip Pizlo  <fpizlo@apple.com>

        Implement B3 version of FTL::Output::check()
        https://bugs.webkit.org/show_bug.cgi?id=152743

        Reviewed by Geoffrey Garen.

        Turns out this was just like the LLVM version.

        * ftl/FTLB3Output.cpp:
        (JSC::FTL::Output::branch):
        (JSC::FTL::Output::check):
        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::switchInstruction):
        (JSC::FTL::Output::check): Deleted.

2016-01-05  Mark Lam  <mark.lam@apple.com>

        Add support for aliasing JSC Options.
        https://bugs.webkit.org/show_bug.cgi?id=152551

        Reviewed by Filip Pizlo.

        This allows us to use old options names as well.  This is for the benefit of
        third party tools which may have been built to rely on those old options.  The
        old option names will be mapped to the current option names in setOption().

        For some options, the old option name specifies the inverse boolean value of the
        current option name.  setOption() will take care of inverting the value before
        applying it to the option.

        * jsc.cpp:
        (CommandLine::parseArguments):
        - Switch to dumping only overridden options here.  Verbose dumping is too much
          for common usage.
        * runtime/Options.cpp:
        (JSC::overrideOptionWithHeuristic):
        (JSC::Options::overrideAliasedOptionWithHeuristic):
        (JSC::computeNumberOfWorkerThreads):
        (JSC::Options::initialize):
        (JSC::Options::setOptionWithoutAlias):
        (JSC::invertBoolOptionValue):
        (JSC::Options::setAliasedOption):
        (JSC::Options::setOption):
        (JSC::Options::dumpAllOptions):
        - String.ascii() converts newline characters to '?', and this was messing up the
          printing of the options.  Switched to using String.utf8() instead.
        (JSC::Options::dumpOption):
        * runtime/Options.h:

2016-01-05  Mark Lam  <mark.lam@apple.com>

        Add validation of JSC options to catch typos.
        https://bugs.webkit.org/show_bug.cgi?id=152549

        Reviewed by Benjamin Poulain.

        1. If a JSC_xxx option is found and xxx is not a valid option, we will now log
           an error message.
        2. The jsc app is commonly used as follows:

               $ jsc [jsc options] [scripts]
     
           Previously, we'll continue to parse for [jsc options] after [scripts] is seen.
           We won't do this anymore.  Any --xxx jsc options must precede the [scripts]
           arguments.

        3. If a --xxx jsc option is specified, but xxx is not a valid option, we will
           now log an error message.

        4. Added JSC_validateOptions, which if set to true will cause the VM to crash if
           an invalid option was seen during options parsing.

        * jsc.cpp:
        (CommandLine::parseArguments):
        * runtime/Options.cpp:
        (JSC::Options::initialize):
        * runtime/Options.h:

2016-01-04  Keith Miller  <keith_miller@apple.com>

        Turn off Internal Function inlining in the DFG for super calls.
        https://bugs.webkit.org/show_bug.cgi?id=152695

        Reviewed by Geoffrey Garen.

        Currently, we inline several InternalFunctions into an alloctation with a
        fixed structure in the DFG. This optimization is not valid when the
        InternalFunction is called via a super call.

        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::attemptToInlineCall):
        (JSC::DFG::ByteCodeParser::handleConstantInternalFunction):

2016-01-04  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should do binary snippets
        https://bugs.webkit.org/show_bug.cgi?id=152668

        Reviewed by Mark Lam.

        This finishes all of the rest of the snippets.

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBitOr):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBitXor):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBitRShift):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBitLShift):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBitURShift):
        (JSC::FTL::DFG::LowerDFGToLLVM::emitBinaryBitOpSnippet):
        (JSC::FTL::DFG::LowerDFGToLLVM::emitRightShiftSnippet):
        (JSC::FTL::DFG::LowerDFGToLLVM::allocateCell):
        * tests/stress/object-bit-or.js: Added.
        (foo):
        (things.valueOf):
        * tests/stress/object-bit-xor.js: Added.
        (foo):
        (things.valueOf):
        * tests/stress/object-lshift.js: Added.
        (foo):
        (things.valueOf):
        * tests/stress/object-rshift.js: Added.
        (foo):
        (things.valueOf):
        * tests/stress/object-urshift.js: Added.
        (foo):
        (things.valueOf):
        * tests/stress/untyped-bit-or.js: Added.
        (foo):
        (valueOf):
        * tests/stress/untyped-bit-xor.js: Added.
        (foo):
        (valueOf):
        * tests/stress/untyped-lshift.js: Added.
        (foo):
        (valueOf):
        * tests/stress/untyped-rshift.js: Added.
        (foo):
        (valueOf):
        * tests/stress/untyped-urshift.js: Added.
        (foo):
        (valueOf):

2016-01-04  Mark Lam  <mark.lam@apple.com>

        isUntypedSpeculationForArithmetic is wrong.
        https://bugs.webkit.org/show_bug.cgi?id=152708

        Reviewed by Filip Pizlo.

        The isUntypedSpeculation...() checks should return true is we ever see
        non-numeric types, regardless of whether numeric types are seen or not.
        Previously, they only return true if we only see non-numeric types, and false if
        we ever see numeric types.

        This patch is perf neutral on both x86_64 and x86.

        * bytecode/SpeculatedType.h:
        (JSC::isUntypedSpeculationForArithmetic):
        (JSC::isUntypedSpeculationForBitOps):

2016-01-04  Tim Horton  <timothy_horton@apple.com>

        Turn on gesture events when building for Yosemite
        https://bugs.webkit.org/show_bug.cgi?id=152704
        rdar://problem/24042472

        Reviewed by Anders Carlsson.

        * Configurations/FeatureDefines.xcconfig:

2016-01-04  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should do BitAnd binary snippets
        https://bugs.webkit.org/show_bug.cgi?id=152713

        Reviewed by Mark Lam.

        Getting ready to finish up the binary bitop snippets.

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBitAnd):
        (JSC::FTL::DFG::LowerDFGToLLVM::emitBinarySnippet):
        (JSC::FTL::DFG::LowerDFGToLLVM::emitBinaryBitOpSnippet):
        (JSC::FTL::DFG::LowerDFGToLLVM::allocateCell):
        * tests/stress/object-bit-and.js: Added.
        (foo):
        (things.valueOf):
        * tests/stress/untyped-bit-and.js: Added.
        (foo):
        (valueOf):

2016-01-04  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should do all of the non-bitop binary snippets
        https://bugs.webkit.org/show_bug.cgi?id=152709

        Reviewed by Mark Lam.

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileValueAdd):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileStrCat):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithMul):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithDiv):
        * tests/stress/object-add.js: Added.
        (foo):
        (things.valueOf):
        * tests/stress/object-div.js: Added.
        (foo):
        (things.valueOf):
        * tests/stress/object-mul.js: Added.
        (foo):
        (things.valueOf):
        * tests/stress/untyped-add.js: Added.
        (foo):
        (valueOf):
        * tests/stress/untyped-div.js: Added.
        (foo):
        (valueOf):
        * tests/stress/untyped-mul.js: Added.
        (foo):
        (valueOf):

2016-01-04  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should do the ArithSub binary snippet
        https://bugs.webkit.org/show_bug.cgi?id=152705

        Reviewed by Saam Barati.

        This implements the ArithSub binary snippet generator in FTL B3.

        While doing this, I discovered that the DFG type inference logic for ArithSub contains a
        classic mistake: it causes the snippets to kick in when the type set does not contain numbers
        rather than kicking in when the type set contains non-numbers. So, the original test that I
        wrote for this doesn't work right (it runs to completion but OSR exits ad infinitum). I wrote
        a second test that is simpler, and that one shows that the binary snippets "work". That's
        sort of a joke though, since the only way to trigger binary snippets is to never pass numbers
        and the only way to actually cause a binary snippet to do meaninful work is to pass numbers.
        I filed a bug about this mess: https://bugs.webkit.org/show_bug.cgi?id=152708.

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileUntypedBinaryOp):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithAddOrSub):
        (JSC::FTL::DFG::LowerDFGToLLVM::nonSpeculativeCompare):
        (JSC::FTL::DFG::LowerDFGToLLVM::emitBinarySnippet):
        (JSC::FTL::DFG::LowerDFGToLLVM::allocateCell):
        (JSC::FTL::DFG::LowerDFGToLLVM::lowBlock):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExitDescriptor):
        * tests/stress/object-sub.js: Added.
        (foo):
        (things.valueOf):
        * tests/stress/untyped-sub.js: Added.
        (foo):
        (valueOf):

2016-01-04  Filip Pizlo  <fpizlo@apple.com>

        Unreviewed, disable FTL B3 for now. I didn't intend to enable it yet.

        * dfg/DFGCommon.h:

2016-01-04  Filip Pizlo  <fpizlo@apple.com>

        B3 patchpoints should allow requesting scratch registers
        https://bugs.webkit.org/show_bug.cgi?id=152669

        Reviewed by Benjamin Poulain.

        Scratch registers are something that we often need in many patchpoint use cases. In LLVM's
        patchpoints, we didn't have a good way to request scratch registers. So, our current FTL code
        often does crazy scratch register allocation madness even when it would be better to just ask
        the backend for some registers. This patch adds a mechanism for requesting scratch registers
        in B3, and wires it all the way to all of our register allocation and liveness
        infrastructure.

        From the standpoint of a patchpoint, a "scratch register" is an instruction argument that
        only admits Tmp and is defined early (like an early clobber register) and is used late (like
        what we previously called LateUse, except that this time it's also a warm use). We already
        had the beginning of support for early def's because of early clobbers, and we already
        supported late uses albeit cold ones. I really only needed to add one new role: "Scratch",
        which means both early def and late use in much the same way as "UseDef" means both early
        use and late def. But, it feels better to complete the set of roles, so I added LateColdUse
        to differentiate from LateUse (which is now a warm use) and EarlyDef to differentiate from
        Def (which is, and always has been, a late def). Forcing the code to deal with the full
        matrix of possibilities resulted in what is probably a progression in how we handle defs in
        the register and stack allocators. The new Inst::forEachDef(Inst*, Inst*, callback) fully
        recognizes that a "def" is something that can come from either the preceding instruction or
        the succeeding one.

        This doesn't add any new functionality to FTL B3 yet, but the new scratch register mechanism
        is covered by new testb3 tests.

        * b3/B3CheckSpecial.cpp:
        (JSC::B3::CheckSpecial::isValid):
        (JSC::B3::CheckSpecial::admitsStack):
        (JSC::B3::CheckSpecial::generate):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3PatchpointSpecial.cpp:
        (JSC::B3::PatchpointSpecial::forEachArg):
        (JSC::B3::PatchpointSpecial::isValid):
        (JSC::B3::PatchpointSpecial::admitsStack):
        (JSC::B3::PatchpointSpecial::generate):
        * b3/B3PatchpointValue.cpp:
        (JSC::B3::PatchpointValue::dumpMeta):
        (JSC::B3::PatchpointValue::PatchpointValue):
        * b3/B3PatchpointValue.h:
        * b3/B3StackmapGenerationParams.cpp:
        (JSC::B3::StackmapGenerationParams::unavailableRegisters):
        * b3/B3StackmapGenerationParams.h:
        (JSC::B3::StackmapGenerationParams::gpScratch):
        (JSC::B3::StackmapGenerationParams::fpScratch):
        * b3/B3StackmapSpecial.cpp:
        (JSC::B3::StackmapSpecial::forEachArgImpl):
        (JSC::B3::StackmapSpecial::isValidImpl):
        (JSC::B3::StackmapSpecial::admitsStackImpl):
        (JSC::B3::StackmapSpecial::repsImpl):
        (JSC::B3::StackmapSpecial::isArgValidForValue):
        (JSC::B3::StackmapSpecial::appendRepsImpl): Deleted.
        * b3/B3StackmapSpecial.h:
        * b3/air/AirAllocateStack.cpp:
        (JSC::B3::Air::allocateStack):
        * b3/air/AirArg.cpp:
        (WTF::printInternal):
        * b3/air/AirArg.h:
        (JSC::B3::Air::Arg::isAnyUse):
        (JSC::B3::Air::Arg::isColdUse):
        (JSC::B3::Air::Arg::isEarlyUse):
        (JSC::B3::Air::Arg::isLateUse):
        (JSC::B3::Air::Arg::isAnyDef):
        (JSC::B3::Air::Arg::isEarlyDef):
        (JSC::B3::Air::Arg::isLateDef):
        (JSC::B3::Air::Arg::isZDef):
        (JSC::B3::Air::Arg::Arg):
        (JSC::B3::Air::Arg::imm):
        (JSC::B3::Air::Arg::isDef): Deleted.
        * b3/air/AirBasicBlock.h:
        (JSC::B3::Air::BasicBlock::at):
        (JSC::B3::Air::BasicBlock::get):
        (JSC::B3::Air::BasicBlock::last):
        * b3/air/AirEliminateDeadCode.cpp:
        (JSC::B3::Air::eliminateDeadCode):
        * b3/air/AirFixPartialRegisterStalls.cpp:
        (JSC::B3::Air::fixPartialRegisterStalls):
        * b3/air/AirInst.cpp:
        (JSC::B3::Air::Inst::hasArgEffects):
        * b3/air/AirInst.h:
        * b3/air/AirInstInlines.h:
        (JSC::B3::Air::Inst::extraEarlyClobberedRegs):
        (JSC::B3::Air::Inst::forEachDef):
        (JSC::B3::Air::Inst::forEachDefWithExtraClobberedRegs):
        (JSC::B3::Air::Inst::reportUsedRegisters):
        (JSC::B3::Air::Inst::forEachTmpWithExtraClobberedRegs): Deleted.
        * b3/air/AirIteratedRegisterCoalescing.cpp:
        * b3/air/AirLiveness.h:
        (JSC::B3::Air::AbstractLiveness::AbstractLiveness):
        (JSC::B3::Air::AbstractLiveness::LocalCalc::execute):
        * b3/air/AirSpillEverything.cpp:
        (JSC::B3::Air::spillEverything):
        * b3/air/AirTmpWidth.cpp:
        (JSC::B3::Air::TmpWidth::recompute):
        * b3/air/AirUseCounts.h:
        (JSC::B3::Air::UseCounts::UseCounts):
        * b3/testb3.cpp:
        (JSC::B3::testPatchpointAny):
        (JSC::B3::testPatchpointGPScratch):
        (JSC::B3::testPatchpointFPScratch):
        (JSC::B3::testPatchpointLotsOfLateAnys):
        (JSC::B3::run):

2016-01-04  Csaba Osztrogonác  <ossy@webkit.org>

        Fix the !ENABLE(INTL) build after r193493
        https://bugs.webkit.org/show_bug.cgi?id=152689

        Reviewed by Alex Christensen.

        * runtime/NumberPrototype.cpp:
        (JSC::NumberPrototype::finishCreation):

2016-01-04  Csaba Osztrogonác  <ossy@webkit.org>

        JSC generator scripts shouldn't have verbose output
        https://bugs.webkit.org/show_bug.cgi?id=152382

        Reviewed by Michael Catanzaro.

        * b3/air/opcode_generator.rb:
        * generate-bytecode-files:
        * offlineasm/asm.rb:
        * offlineasm/generate_offset_extractor.rb:
        * offlineasm/parser.rb:

2016-01-04  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Build B3 by default on iOS ARM64
        https://bugs.webkit.org/show_bug.cgi?id=152525

        Reviewed by Filip Pizlo.

        Minor changes required to get testb3 to compile.

        * Configurations/ToolExecutable.xcconfig:
        We need an entitlement to allocate executable memory.

        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::scratchRegister):
        (JSC::MacroAssemblerARM64::getCachedDataTempRegisterIDAndInvalidate):
        (JSC::MacroAssemblerARM64::getCachedMemoryTempRegisterIDAndInvalidate):
        Expose one of the scratch registers for ValueRep::emitRestore().
        Guard the use of scratch registers when not allowed.

        * b3/air/AirOpcode.opcodes:
        ARM addressing is a bit different. Skip Addr to make things build.

        * b3/testb3.cpp:
        (JSC::B3::testPatchpointWithStackArgumentResult):
        Add on memory only exists on x86.

        * jit/RegisterSet.cpp:
        (JSC::RegisterSet::macroScratchRegisters):
        Add the two scratch registers, useful for patchpoints.

2016-01-03  Khem Raj  <raj.khem@gmail.com>

        WebKit fails to build with musl libc library
        https://bugs.webkit.org/show_bug.cgi?id=152625

        Reviewed by Daniel Bates.

        Qualify isnan() calls with std namespace.

        * runtime/Options.cpp:
        (Option::operator==): Add std namespace qualifier.

2016-01-03  Andreas Kling  <akling@apple.com>

        Remove redundant StringImpl substring creation function.
        <https://webkit.org/b/152652>

        Reviewed by Daniel Bates.

        Remove jsSubstring8() and make the only call site use jsSubstring().

        * runtime/JSString.h:
        (JSC::jsSubstring8): Deleted.
        * runtime/StringPrototype.cpp:
        (JSC::replaceUsingRegExpSearch):

2016-01-02  Khem Raj  <raj.khem@gmail.com>

        Clang's builtin for clear_cache accepts char* and errors out
        when using void*, using char* work on both gcc and clang
        since char* is auto-converted to void* in gcc case.
        https://bugs.webkit.org/show_bug.cgi?id=152654

        Reviewed by Michael Saboff;

        * assembler/ARM64Assembler.h:
        (linuxPageFlush): Convert arguments to __builtin___clear_cache()
        to char*.

2015-12-31  Andy Estes  <aestes@apple.com>

        Replace WTF::move with WTFMove
        https://bugs.webkit.org/show_bug.cgi?id=152601

        Reviewed by Brady Eidson.

        * API/ObjCCallbackFunction.mm:
        (JSC::ObjCCallbackFunctionImpl::ObjCCallbackFunctionImpl):
        (JSC::ObjCCallbackFunction::ObjCCallbackFunction):
        (JSC::ObjCCallbackFunction::create):
        (objCCallbackFunctionForInvocation):
        * assembler/AssemblerBuffer.h:
        (JSC::AssemblerBuffer::releaseAssemblerData):
        * assembler/LinkBuffer.cpp:
        (JSC::LinkBuffer::linkCode):
        * b3/B3BlockInsertionSet.cpp:
        (JSC::B3::BlockInsertionSet::insert):
        (JSC::B3::BlockInsertionSet::splitForward):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::run):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3OpaqueByproducts.cpp:
        (JSC::B3::OpaqueByproducts::add):
        * b3/B3Procedure.cpp:
        (JSC::B3::Procedure::addBlock):
        (JSC::B3::Procedure::addDataSection):
        * b3/B3Procedure.h:
        (JSC::B3::Procedure::releaseByproducts):
        * b3/B3ProcedureInlines.h:
        (JSC::B3::Procedure::add):
        * b3/B3Value.h:
        * b3/air/AirCode.cpp:
        (JSC::B3::Air::Code::addBlock):
        (JSC::B3::Air::Code::addStackSlot):
        (JSC::B3::Air::Code::addSpecial):
        * b3/air/AirInst.h:
        (JSC::B3::Air::Inst::Inst):
        * b3/air/AirIteratedRegisterCoalescing.cpp:
        * b3/air/AirSimplifyCFG.cpp:
        (JSC::B3::Air::simplifyCFG):
        * bindings/ScriptValue.cpp:
        (Deprecated::jsToInspectorValue):
        * builtins/BuiltinExecutables.cpp:
        (JSC::createExecutableInternal):
        * bytecode/BytecodeBasicBlock.cpp:
        (JSC::computeBytecodeBasicBlocks):
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::finishCreation):
        (JSC::CodeBlock::setCalleeSaveRegisters):
        * bytecode/CodeBlock.h:
        (JSC::CodeBlock::setJITCodeMap):
        (JSC::CodeBlock::livenessAnalysis):
        * bytecode/GetByIdStatus.cpp:
        (JSC::GetByIdStatus::computeForStubInfoWithoutExitSiteFeedback):
        * bytecode/GetByIdVariant.cpp:
        (JSC::GetByIdVariant::GetByIdVariant):
        * bytecode/PolymorphicAccess.cpp:
        (JSC::PolymorphicAccess::regenerateWithCases):
        (JSC::PolymorphicAccess::regenerateWithCase):
        (JSC::PolymorphicAccess::regenerate):
        * bytecode/PutByIdStatus.cpp:
        (JSC::PutByIdStatus::computeForStubInfo):
        * bytecode/PutByIdVariant.cpp:
        (JSC::PutByIdVariant::setter):
        * bytecode/StructureStubClearingWatchpoint.cpp:
        (JSC::StructureStubClearingWatchpoint::push):
        * bytecode/StructureStubClearingWatchpoint.h:
        (JSC::StructureStubClearingWatchpoint::StructureStubClearingWatchpoint):
        * bytecode/StructureStubInfo.cpp:
        (JSC::StructureStubInfo::addAccessCase):
        * bytecode/UnlinkedCodeBlock.cpp:
        (JSC::UnlinkedCodeBlock::setInstructions):
        * bytecode/UnlinkedFunctionExecutable.cpp:
        (JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
        * bytecode/UnlinkedFunctionExecutable.h:
        * bytecompiler/SetForScope.h:
        (JSC::SetForScope::SetForScope):
        * dfg/DFGGraph.cpp:
        (JSC::DFG::Graph::livenessFor):
        (JSC::DFG::Graph::killsFor):
        * dfg/DFGJITCompiler.cpp:
        (JSC::DFG::JITCompiler::link):
        (JSC::DFG::JITCompiler::compile):
        (JSC::DFG::JITCompiler::compileFunction):
        * dfg/DFGJITFinalizer.cpp:
        (JSC::DFG::JITFinalizer::JITFinalizer):
        * dfg/DFGLivenessAnalysisPhase.cpp:
        (JSC::DFG::LivenessAnalysisPhase::process):
        * dfg/DFGObjectAllocationSinkingPhase.cpp:
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::addSlowPathGenerator):
        (JSC::DFG::SpeculativeJIT::compileIn):
        (JSC::DFG::SpeculativeJIT::compileCreateDirectArguments):
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::cachedGetById):
        (JSC::DFG::SpeculativeJIT::cachedPutById):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::cachedGetById):
        (JSC::DFG::SpeculativeJIT::cachedPutById):
        * dfg/DFGWorklist.cpp:
        (JSC::DFG::Worklist::finishCreation):
        * disassembler/Disassembler.cpp:
        (JSC::disassembleAsynchronously):
        * ftl/FTLB3Compile.cpp:
        (JSC::FTL::compile):
        * ftl/FTLCompile.cpp:
        (JSC::FTL::mmAllocateDataSection):
        * ftl/FTLJITCode.cpp:
        (JSC::FTL::JITCode::initializeB3Byproducts):
        * ftl/FTLJITFinalizer.h:
        (JSC::FTL::OutOfLineCodeInfo::OutOfLineCodeInfo):
        * ftl/FTLLink.cpp:
        (JSC::FTL::link):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileTailCall):
        (JSC::FTL::DFG::LowerDFGToLLVM::lazySlowPath):
        * heap/Heap.cpp:
        (JSC::Heap::releaseDelayedReleasedObjects):
        (JSC::Heap::markRoots):
        (JSC::Heap::setIncrementalSweeper):
        * heap/HeapInlines.h:
        (JSC::Heap::releaseSoon):
        (JSC::Heap::registerWeakGCMap):
        * heap/WeakInlines.h:
        * inspector/ConsoleMessage.cpp:
        (Inspector::ConsoleMessage::addToFrontend):
        * inspector/ContentSearchUtilities.cpp:
        (Inspector::ContentSearchUtilities::searchInTextByLines):
        * inspector/InjectedScript.cpp:
        (Inspector::InjectedScript::getFunctionDetails):
        (Inspector::InjectedScript::getProperties):
        (Inspector::InjectedScript::getDisplayableProperties):
        (Inspector::InjectedScript::getInternalProperties):
        (Inspector::InjectedScript::getCollectionEntries):
        (Inspector::InjectedScript::wrapCallFrames):
        * inspector/InspectorAgentRegistry.cpp:
        (Inspector::AgentRegistry::append):
        (Inspector::AgentRegistry::appendExtraAgent):
        * inspector/InspectorBackendDispatcher.cpp:
        (Inspector::BackendDispatcher::CallbackBase::CallbackBase):
        (Inspector::BackendDispatcher::CallbackBase::sendSuccess):
        (Inspector::BackendDispatcher::BackendDispatcher):
        (Inspector::BackendDispatcher::create):
        (Inspector::BackendDispatcher::sendPendingErrors):
        * inspector/InspectorProtocolTypes.h:
        (Inspector::Protocol::Array::addItem):
        * inspector/InspectorValues.cpp:
        * inspector/InspectorValues.h:
        (Inspector::InspectorObjectBase::setValue):
        (Inspector::InspectorObjectBase::setObject):
        (Inspector::InspectorObjectBase::setArray):
        (Inspector::InspectorArrayBase::pushValue):
        (Inspector::InspectorArrayBase::pushObject):
        (Inspector::InspectorArrayBase::pushArray):
        * inspector/JSGlobalObjectConsoleClient.cpp:
        (Inspector::JSGlobalObjectConsoleClient::messageWithTypeAndLevel):
        (Inspector::JSGlobalObjectConsoleClient::timeEnd):
        * inspector/JSGlobalObjectInspectorController.cpp:
        (Inspector::JSGlobalObjectInspectorController::JSGlobalObjectInspectorController):
        (Inspector::JSGlobalObjectInspectorController::appendExtraAgent):
        * inspector/JSInjectedScriptHost.cpp:
        (Inspector::JSInjectedScriptHost::JSInjectedScriptHost):
        * inspector/JSInjectedScriptHost.h:
        (Inspector::JSInjectedScriptHost::create):
        * inspector/agents/InspectorAgent.cpp:
        (Inspector::InspectorAgent::activateExtraDomain):
        * inspector/agents/InspectorConsoleAgent.cpp:
        (Inspector::InspectorConsoleAgent::addMessageToConsole):
        (Inspector::InspectorConsoleAgent::addConsoleMessage):
        * inspector/agents/InspectorDebuggerAgent.cpp:
        (Inspector::InspectorDebuggerAgent::setBreakpointByUrl):
        (Inspector::InspectorDebuggerAgent::resolveBreakpoint):
        (Inspector::InspectorDebuggerAgent::schedulePauseOnNextStatement):
        (Inspector::InspectorDebuggerAgent::breakpointActionProbe):
        (Inspector::InspectorDebuggerAgent::breakProgram):
        * inspector/agents/InspectorHeapAgent.cpp:
        (Inspector::InspectorHeapAgent::didGarbageCollect):
        * inspector/agents/InspectorRuntimeAgent.cpp:
        (Inspector::InspectorRuntimeAgent::getRuntimeTypesForVariablesAtOffsets):
        (Inspector::InspectorRuntimeAgent::getBasicBlocks):
        * inspector/agents/InspectorScriptProfilerAgent.cpp:
        (Inspector::InspectorScriptProfilerAgent::addEvent):
        (Inspector::buildInspectorObject):
        (Inspector::buildProfileInspectorObject):
        (Inspector::InspectorScriptProfilerAgent::trackingComplete):
        * inspector/augmentable/AlternateDispatchableAgent.h:
        * inspector/scripts/codegen/cpp_generator_templates.py:
        * inspector/scripts/codegen/generate_cpp_backend_dispatcher_implementation.py:
        (CppBackendDispatcherImplementationGenerator._generate_small_dispatcher_switch_implementation_for_domain):
        (CppBackendDispatcherImplementationGenerator._generate_dispatcher_implementation_for_command):
        * inspector/scripts/codegen/generate_cpp_frontend_dispatcher_implementation.py:
        (CppFrontendDispatcherImplementationGenerator._generate_dispatcher_implementation_for_event):
        * inspector/scripts/codegen/generate_cpp_protocol_types_header.py:
        (_generate_unchecked_setter_for_member):
        * inspector/scripts/codegen/generate_objc_backend_dispatcher_implementation.py:
        (ObjCConfigurationImplementationGenerator._generate_success_block_for_command):
        * inspector/scripts/codegen/generate_objc_frontend_dispatcher_implementation.py:
        (ObjCFrontendDispatcherImplementationGenerator._generate_event_out_parameters):
        * inspector/scripts/codegen/objc_generator_templates.py:
        * inspector/scripts/tests/expected/commands-with-async-attribute.json-result:
        * inspector/scripts/tests/expected/commands-with-optional-call-return-parameters.json-result:
        * inspector/scripts/tests/expected/domains-with-varying-command-sizes.json-result:
        * inspector/scripts/tests/expected/enum-values.json-result:
        * inspector/scripts/tests/expected/events-with-optional-parameters.json-result:
        * inspector/scripts/tests/expected/generate-domains-with-feature-guards.json-result:
        * inspector/scripts/tests/expected/same-type-id-different-domain.json-result:
        * inspector/scripts/tests/expected/shadowed-optional-type-setters.json-result:
        * inspector/scripts/tests/expected/type-declaration-aliased-primitive-type.json-result:
        * inspector/scripts/tests/expected/type-declaration-array-type.json-result:
        * inspector/scripts/tests/expected/type-declaration-enum-type.json-result:
        * inspector/scripts/tests/expected/type-declaration-object-type.json-result:
        * inspector/scripts/tests/expected/type-requiring-runtime-casts.json-result:
        * jit/CallFrameShuffler.cpp:
        (JSC::CallFrameShuffler::performSafeWrites):
        * jit/PolymorphicCallStubRoutine.cpp:
        (JSC::PolymorphicCallStubRoutine::PolymorphicCallStubRoutine):
        * jit/Repatch.cpp:
        (JSC::tryCacheGetByID):
        (JSC::tryCachePutByID):
        (JSC::tryRepatchIn):
        (JSC::linkPolymorphicCall):
        * parser/Nodes.cpp:
        (JSC::ProgramNode::setClosedVariables):
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseInner):
        (JSC::Parser<LexerType>::parseFunctionInfo):
        * parser/Parser.h:
        (JSC::Parser::closedVariables):
        * parser/SourceProviderCache.cpp:
        (JSC::SourceProviderCache::add):
        * profiler/ProfileNode.h:
        (JSC::CalculateProfileSubtreeDataFunctor::returnValue):
        * replay/EncodedValue.cpp:
        (JSC::EncodedValue::get<EncodedValue>):
        * replay/scripts/CodeGeneratorReplayInputs.py:
        (Generator.generate_member_move_expression):
        * replay/scripts/tests/expected/generate-enum-with-guard.json-TestReplayInputs.cpp:
        (Test::HandleWheelEvent::HandleWheelEvent):
        (JSC::InputTraits<Test::HandleWheelEvent>::decode):
        * replay/scripts/tests/expected/generate-memoized-type-modes.json-TestReplayInputs.cpp:
        (Test::MapInput::MapInput):
        (JSC::InputTraits<Test::MapInput>::decode):
        * runtime/ConsoleClient.cpp:
        (JSC::ConsoleClient::internalMessageWithTypeAndLevel):
        (JSC::ConsoleClient::logWithLevel):
        (JSC::ConsoleClient::clear):
        (JSC::ConsoleClient::dir):
        (JSC::ConsoleClient::dirXML):
        (JSC::ConsoleClient::table):
        (JSC::ConsoleClient::trace):
        (JSC::ConsoleClient::assertCondition):
        (JSC::ConsoleClient::group):
        (JSC::ConsoleClient::groupCollapsed):
        (JSC::ConsoleClient::groupEnd):
        * runtime/JSNativeStdFunction.cpp:
        (JSC::JSNativeStdFunction::create):
        * runtime/JSString.h:
        (JSC::jsNontrivialString):
        * runtime/JSStringJoiner.cpp:
        (JSC::JSStringJoiner::join):
        * runtime/JSStringJoiner.h:
        (JSC::JSStringJoiner::append):
        * runtime/NativeStdFunctionCell.cpp:
        (JSC::NativeStdFunctionCell::create):
        (JSC::NativeStdFunctionCell::NativeStdFunctionCell):
        * runtime/ScopedArgumentsTable.cpp:
        (JSC::ScopedArgumentsTable::setLength):
        * runtime/StructureIDTable.cpp:
        (JSC::StructureIDTable::resize):
        * runtime/TypeSet.cpp:
        (JSC::StructureShape::inspectorRepresentation):
        * runtime/WeakGCMap.h:
        (JSC::WeakGCMap::set):
        * tools/CodeProfile.h:
        (JSC::CodeProfile::addChild):
        * yarr/YarrInterpreter.cpp:
        (JSC::Yarr::ByteCompiler::compile):
        (JSC::Yarr::ByteCompiler::atomParenthesesSubpatternEnd):
        * yarr/YarrInterpreter.h:
        (JSC::Yarr::BytecodePattern::BytecodePattern):
        * yarr/YarrPattern.cpp:
        (JSC::Yarr::YarrPatternConstructor::YarrPatternConstructor):
        (JSC::Yarr::YarrPatternConstructor::reset):
        (JSC::Yarr::YarrPatternConstructor::atomPatternCharacter):
        (JSC::Yarr::YarrPatternConstructor::atomCharacterClassEnd):
        (JSC::Yarr::YarrPatternConstructor::atomParenthesesSubpatternBegin):
        (JSC::Yarr::YarrPatternConstructor::atomParentheticalAssertionBegin):
        (JSC::Yarr::YarrPatternConstructor::copyDisjunction):

2016-01-01  Filip Pizlo  <fpizlo@apple.com>

        Unreviewed, fix copyright dates. It's super annoying when we forget to update these, and I
        just forgot to do so in the last commit. Also update the date of the last commit in the
        ChangeLog.

        * b3/air/AirIteratedRegisterCoalescing.cpp:
        * b3/air/AirOpcode.opcodes:
        * b3/air/AirTmpWidth.cpp:
        * b3/air/AirTmpWidth.h:
        * ftl/FTLB3Output.cpp:
        * ftl/FTLB3Output.h:

2016-01-01  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should be able to run all of the old V8v7 tests
        https://bugs.webkit.org/show_bug.cgi?id=152579

        Reviewed by Saam Barati.

        Fixes some silly bugs that were preventing us from running all of the old V8v7 tests.

        IRC's analysis of when to turn a Move into a Move32 when spilling is based on the premise
        that if the dst has a 32-bit def width, then the src must also have a 32-bit def width. But
        that doesn't happen if the src is an immediate.

        This changes that condition in IRC to use the combined use/def width of both src and dst
        rather than being clever. This is great because it's the combined width that determines the
        size of the spill slot.

        Also added some more debug support to TmpWidth.

        This also fixes Air's description of DivDouble; previously it claimed to be a 32-bit
        operation. Also implements Output::unsignedToDouble(), since we already had everything we
        needed to implement this optimally.

        * b3/air/AirIteratedRegisterCoalescing.cpp:
        * b3/air/AirOpcode.opcodes:
        * b3/air/AirTmpWidth.cpp:
        (JSC::B3::Air::TmpWidth::recompute):
        (JSC::B3::Air::TmpWidth::Widths::dump):
        * b3/air/AirTmpWidth.h:
        (JSC::B3::Air::TmpWidth::Widths::Widths):
        * ftl/FTLB3Output.cpp:
        (JSC::FTL::Output::doubleToUInt):
        (JSC::FTL::Output::unsignedToDouble):
        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::zeroExt):
        (JSC::FTL::Output::zeroExtPtr):
        (JSC::FTL::Output::intToDouble):
        (JSC::FTL::Output::castToInt32):
        (JSC::FTL::Output::unsignedToDouble): Deleted.

2016-01-01  Jeff Miller  <jeffm@apple.com>

        Update user-visible copyright strings to include 2016
        https://bugs.webkit.org/show_bug.cgi?id=152531

        Reviewed by Alexey Proskuryakov.

        * Info.plist:

2015-12-31  Andy Estes  <aestes@apple.com>

        Fix warnings uncovered by migrating to WTF_MOVE
        https://bugs.webkit.org/show_bug.cgi?id=152601

        Reviewed by Daniel Bates.

        * create_regex_tables: Moving a return value prevented copy elision.
        * ftl/FTLUnwindInfo.cpp:
        (JSC::FTL::parseUnwindInfo): Ditto.
        * replay/EncodedValue.h: Ditto.

2015-12-30  Aleksandr Skachkov  <gskachkov@gmail.com>

        [ES6] Arrow function syntax. Arrow function specific features. Lexical bind "super"
        https://bugs.webkit.org/show_bug.cgi?id=149615

        Reviewed by Saam Barati.

        Implemented lexical bind "super" property for arrow function. 'super' property can be accessed 
        inside of the arrow function in case if arrow function is nested in constructor, method, 
        getter or setter of class. In current patch using 'super' in arrow function, that declared out of the 
        class, lead to wrong type of error, should be SyntaxError(https://bugs.webkit.org/show_bug.cgi?id=150893) 
        and this will be fixed in separete patch.

        * builtins/BuiltinExecutables.cpp:
        (JSC::createExecutableInternal):
        * bytecode/EvalCodeCache.h:
        (JSC::EvalCodeCache::getSlow):
        * bytecode/ExecutableInfo.h:
        (JSC::ExecutableInfo::ExecutableInfo):
        (JSC::ExecutableInfo::derivedContextType):
        (JSC::ExecutableInfo::isClassContext):
        * bytecode/UnlinkedCodeBlock.cpp:
        (JSC::UnlinkedCodeBlock::UnlinkedCodeBlock):
        * bytecode/UnlinkedCodeBlock.h:
        (JSC::UnlinkedCodeBlock::derivedContextType):
        (JSC::UnlinkedCodeBlock::isClassContext):
        * bytecode/UnlinkedFunctionExecutable.cpp:
        (JSC::generateUnlinkedFunctionCodeBlock):
        (JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
        * bytecode/UnlinkedFunctionExecutable.h:
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::BytecodeGenerator):
        (JSC::BytecodeGenerator::emitPutDerivedConstructorToArrowFunctionContextScope):
        * bytecompiler/BytecodeGenerator.h:
        (JSC::BytecodeGenerator::derivedContextType):
        (JSC::BytecodeGenerator::isDerivedConstructorContext):
        (JSC::BytecodeGenerator::isDerivedClassContext):
        (JSC::BytecodeGenerator::isArrowFunction):
        (JSC::BytecodeGenerator::makeFunction):
        * bytecompiler/NodesCodegen.cpp:
        (JSC::emitHomeObjectForCallee):
        (JSC::FunctionCallValueNode::emitBytecode):
        * debugger/DebuggerCallFrame.cpp:
        (JSC::DebuggerCallFrame::evaluate):
        * interpreter/Interpreter.cpp:
        (JSC::eval):
        * runtime/CodeCache.cpp:
        (JSC::CodeCache::getFunctionExecutableFromGlobalCode):
        * runtime/Executable.cpp:
        (JSC::ScriptExecutable::ScriptExecutable):
        (JSC::EvalExecutable::create):
        (JSC::EvalExecutable::EvalExecutable):
        (JSC::ProgramExecutable::ProgramExecutable):
        (JSC::ModuleProgramExecutable::ModuleProgramExecutable):
        (JSC::FunctionExecutable::FunctionExecutable):
        * runtime/Executable.h:
        (JSC::ScriptExecutable::derivedContextType):
        * runtime/JSGlobalObjectFunctions.cpp:
        (JSC::globalFuncEval):
        * tests/es6.yaml:
        * tests/stress/arrowfunction-lexical-bind-superproperty.js: Added.

2015-12-29  Yusuke Suzuki  <utatane.tea@gmail.com>

        Unreviewed, relax limitation in operationCreateThis
        https://bugs.webkit.org/show_bug.cgi?id=152383

        Unreviewed. operationCreateThis now can be called with non constructible function.

        * dfg/DFGOperations.cpp:

2015-12-29  Yusuke Suzuki  <utatane.tea@gmail.com>

        [ES6][ES7] Drop Constructability of generator function
        https://bugs.webkit.org/show_bug.cgi?id=152383

        Reviewed by Saam Barati.

        We drop the constructability of generator functions.
        This functionality is already landed in ES 2016 draft[1].
        And this simplifies the existing JSC's generator implementation;
        dropping GeneratorThisMode flag.

        [1]: https://github.com/tc39/ecma262/releases/tag/es2016-draft-20151201

        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * builtins/BuiltinExecutables.cpp:
        (JSC::createExecutableInternal):
        * bytecode/ExecutableInfo.h:
        (JSC::ExecutableInfo::ExecutableInfo):
        (JSC::ExecutableInfo::generatorThisMode): Deleted.
        * bytecode/UnlinkedCodeBlock.cpp:
        (JSC::UnlinkedCodeBlock::UnlinkedCodeBlock): Deleted.
        * bytecode/UnlinkedCodeBlock.h:
        (JSC::UnlinkedCodeBlock::generatorThisMode): Deleted.
        * bytecode/UnlinkedFunctionExecutable.cpp:
        (JSC::generateUnlinkedFunctionCodeBlock):
        (JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
        * bytecode/UnlinkedFunctionExecutable.h:
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::BytecodeGenerator): Deleted.
        * bytecompiler/BytecodeGenerator.h:
        (JSC::BytecodeGenerator::makeFunction):
        (JSC::BytecodeGenerator::generatorThisMode): Deleted.
        * bytecompiler/NodesCodegen.cpp:
        (JSC::ThisNode::emitBytecode):
        * interpreter/Interpreter.cpp:
        (JSC::eval): Deleted.
        * runtime/CodeCache.cpp:
        (JSC::CodeCache::getFunctionExecutableFromGlobalCode):
        * runtime/Executable.h:
        * runtime/GeneratorThisMode.h: Removed.
        * tests/stress/generator-eval-this.js:
        (shouldThrow):
        * tests/stress/generator-is-not-constructible.js: Added.
        (shouldThrow):
        (A.staticGen):
        (A.prototype.gen):
        (A):
        (TypeError):
        * tests/stress/generator-this.js:
        (shouldBe.g.next):
        * tests/stress/generator-with-new-target.js:
        (shouldThrow):

2015-12-27  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should know that used registers are not the same thing as used registers. Rename the
        latter to unavailable registers to avoid future confusion.
        https://bugs.webkit.org/show_bug.cgi?id=152572

        Reviewed by Saam Barati.

        Prior to this change, we used the term "used registers" in two different senses:

        - The set of registers that are live at some point in the current compilation unit. A
          register is live at some point if it is read after that point on some path through that
          point.

        - The set of registers that are not available for scratch register use at some point. A
          register may not be available if it is live or if it is a callee-save register but it is
          not being saved by the current compilation.

        In the old FTL LLVM code, we had some translations from the first sense into the second
        sense. We forgot to do those in FTL B3, and so we get crashes, for example in V8/splay. That
        benchmark highlighted this issue because it fired some lazy slow paths, and then used an
        unsaved callee-save for scratch.
 
        Curiously, we could merge these two definitions by observing that, in some sense, an unsaved
        callee save is live at every point in a compilation in the sense that it may contain a value
        that will be read when the compilation returns. That's pretty cool, but it feels strange to
        me. This isn't how we would normally define liveness of registers. It's not how the
        Air::TmpLiveness analysis would do it for any of its other clients.

        So, this changes B3 to have two different concepts:

        - Used registers. These are the registers that are live.

        - Unavailable registers. These are the registers that are not available for scratch. It's
          always a superset of used registers.

        This also changes FTLLower to use unavailableRegisters() pretty much everywhere that it
        previously used usedRegisters().

        This makes it possible to run V8/splay.

        * b3/B3StackmapGenerationParams.cpp:
        (JSC::B3::StackmapGenerationParams::usedRegisters):
        (JSC::B3::StackmapGenerationParams::unavailableRegisters):
        (JSC::B3::StackmapGenerationParams::proc):
        * b3/B3StackmapGenerationParams.h:
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compilePutById):
        (JSC::FTL::DFG::LowerDFGToLLVM::getById):
        (JSC::FTL::DFG::LowerDFGToLLVM::lazySlowPath):

2015-12-25  Andy Estes  <aestes@apple.com>

        Stop moving local objects in return statements
        https://bugs.webkit.org/show_bug.cgi?id=152557

        Reviewed by Brady Eidson.

        Calling std::move() on a local object in a return statement prevents the compiler from applying the return value optimization.

        Clang can warn about these mistakes with -Wpessimizing-move, although only when std::move() is called directly.
        I found these issues by temporarily replacing WTF::move with std::move and recompiling.

        * inspector/ScriptCallStack.cpp:
        (Inspector::ScriptCallStack::buildInspectorArray):
        * inspector/agents/InspectorScriptProfilerAgent.cpp:
        (Inspector::buildInspectorObject):
        * jit/CallFrameShuffler.h:
        (JSC::CallFrameShuffler::snapshot):
        * runtime/TypeSet.cpp:
        (JSC::TypeSet::allStructureRepresentations):
        (JSC::StructureShape::inspectorRepresentation):

2015-12-26  Mark Lam  <mark.lam@apple.com>

        Rename NodeMayOverflowInXXX to NodeMayOverflowInt32InXXX.
        https://bugs.webkit.org/show_bug.cgi?id=152555

        Reviewed by Alex Christensen.

        That's because the NodeMayOverflowInBaseline and NodeMayOverflowInDFG flags only
        indicates potential overflowing of Int32 values.  We'll be adding overflow
        profiling for Int52 values later, and we should disambiguate between the 2 types.

        This is purely a renaming patch.  There are no semantic changes.

        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::makeSafe):
        (JSC::DFG::ByteCodeParser::makeDivSafe):
        (JSC::DFG::ByteCodeParser::handleIntrinsicCall):
        * dfg/DFGNodeFlags.cpp:
        (JSC::DFG::dumpNodeFlags):
        * dfg/DFGNodeFlags.h:
        (JSC::DFG::nodeMayOverflowInt32):
        (JSC::DFG::nodeCanSpeculateInt32):
        (JSC::DFG::nodeMayOverflow): Deleted.

2015-12-23  Andreas Kling  <akling@apple.com>

        jsc CLI tool crashes on EOF.
        <https://webkit.org/b/152522>

        Reviewed by Benjamin Poulain.

        SourceProvider should treat String() like the empty string for hashing purposes.
        This was a subtle behavior change in r194017 due to how zero-length strings are
        treated by StringImpl::createSubstringSharingImpl().

        I made these SourceProviders store a Ref<StringImpl> internally instead of a
        String, to codify the fact that these strings can't be null strings.

        I couldn't find a way to cause this crash through the API.

        * API/JSScriptRef.cpp:
        (OpaqueJSScript::OpaqueJSScript):
        * parser/SourceProvider.h:
        (JSC::StringSourceProvider::StringSourceProvider):

2015-12-23  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should be able to run crypto-sha1 in eager mode
        https://bugs.webkit.org/show_bug.cgi?id=152539

        Reviewed by Saam Barati.

        This patch contains one real bug fix and some other fixes that are primarily there for sanity
        because I don't believe they are symptomatic.

        The real fix is the instruction selector's handling of Phi. It was assuming that the correct
        lowering of Phi is to do nothing and the correct lowering of Upsilon is to store into the tmp
        that the Phi uses. But this fails for code patterns like:

            @a = Phi()
            Upsilon(@x, ^a)
            use(@a) // this should see the value that @a had at the point that "@a = Phi()" executed.

        This arises when we have a lot of Upsilons in a row and they are trying to perform a
        shuffling. Prior to this change, "use(@a)" would see the new value of @a, i.e. @x. That's
        wrong. So, this changes the lowering to make each Phi have a special shadow Tmp, and Upsilon
        stores to it while Phi loads from it. Most of these assignments get copy-propagated by IRC,
        so it doesn't really hurt us. I couldn't find any benchmarks that slowed down because of
        this. In fact, I believe that the only time that this would lead to extra interference or
        extra assignments is when it's actually needed to be correct.

        This also contains other fixes, which are probably not for real bugs, but they make me feel
        all warm and fuzzy:

        - spillEverything() works again.  Previously, it didn't have all of IRC's smarts for handling
          a spill of a ZDef.  I fixed this by creating a helper phase that finds all subwidth ZDefs
          to spill slots and amends them with zero-fills of the top bits.

        - IRC no longer requires precise TmpWidth analysis.  Previously, if TmpWidth gave pessimistic
          results, the subwidth ZDef bug would return.  That probably means that it was never fixed
          to begin with, since it's totally cool for just a single def or use of a tmp to cause it
          to become pessimistic. But there may still have been some subwidth ZDefs.  The way that I
          fixed this bug is to have IRC also run the ZDef fixup code that spillEverything() uses.
          This is abstracted behind the beautifully named Air::fixSpillSlotZDef().

        - B3::validate() does dominance checks!  So, if you shoot yourself in the foot by using
          something before defining it, validate() will tell you.

        - Air::TmpWidth is now easy to "turn off" - i.e. to make it go fully conservative. It's not
          an Option; you have to hack code. But that's better than nothing, and it's consistent with
          what we do for other super-internal compiler options that we use rarely.

        - You can now run spillEverything() without hacking code.  Just use
          Options::airSpillSeverything().

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::LowerToAir):
        (JSC::B3::Air::LowerToAir::run):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3Validate.cpp:
        * b3/air/AirCode.h:
        (JSC::B3::Air::Code::specials):
        (JSC::B3::Air::Code::forAllTmps):
        (JSC::B3::Air::Code::isFastTmp):
        * b3/air/AirFixSpillSlotZDef.h: Added.
        (JSC::B3::Air::fixSpillSlotZDef):
        * b3/air/AirGenerate.cpp:
        (JSC::B3::Air::prepareForGeneration):
        * b3/air/AirIteratedRegisterCoalescing.cpp:
        * b3/air/AirSpillEverything.cpp:
        (JSC::B3::Air::spillEverything):
        * b3/air/AirTmpWidth.cpp:
        (JSC::B3::Air::TmpWidth::recompute):
        * jit/JITOperations.cpp:
        * runtime/Options.h:

2015-12-23  Filip Pizlo  <fpizlo@apple.com>

        Need a story for platform-specific Args
        https://bugs.webkit.org/show_bug.cgi?id=152529

        Reviewed by Michael Saboff.

        This teaches Arg that some Arg forms are not valid on some targets. The instruction selector now
        uses this to avoid immediates and addresses that the target wouldn't like.

        This shouldn't change code generation on X86, but is meant as a step towards ARM64 support.

        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::crossesInterference):
        (JSC::B3::Air::LowerToAir::effectiveAddr):
        (JSC::B3::Air::LowerToAir::addr):
        (JSC::B3::Air::LowerToAir::loadPromise):
        (JSC::B3::Air::LowerToAir::imm):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/air/AirAllocateStack.cpp:
        (JSC::B3::Air::allocateStack):
        * b3/air/AirArg.h:
        (JSC::B3::Air::Arg::Arg):
        (JSC::B3::Air::Arg::imm):
        (JSC::B3::Air::Arg::imm64):
        (JSC::B3::Air::Arg::callArg):
        (JSC::B3::Air::Arg::isValidScale):
        (JSC::B3::Air::Arg::tmpIndex):
        (JSC::B3::Air::Arg::withOffset):
        (JSC::B3::Air::Arg::isValidImmForm):
        (JSC::B3::Air::Arg::isValidAddrForm):
        (JSC::B3::Air::Arg::isValidIndexForm):
        (JSC::B3::Air::Arg::isValidForm):
        (JSC::B3::Air::Arg::forEachTmpFast):
        * b3/air/opcode_generator.rb:

2015-12-23  Keith Miller  <keith_miller@apple.com>

        [JSC] Bugfix for intrinsic getters with dictionary structures.
        https://bugs.webkit.org/show_bug.cgi?id=152538

        Reviewed by Mark Lam.

        Intrinsic getters did not check if an object was a dictionary. This meant, if a property on
        the prototype chain of a dictionary was an intrinsic getter we would IC it. Later, if a
        property is added to the dictionary the IC would still return the result of the intrinsic.
        The fix is to no longer IC intrinsic getters if the base object is a dictionary.

        * jit/Repatch.cpp:
        (JSC::tryCacheGetByID):
        * tests/stress/typedarray-length-dictionary.js: Added.
        (len):

2015-12-23  Andy VanWagoner  <andy@instructure.com>

        [INTL] Implement DateTime Format Functions
        https://bugs.webkit.org/show_bug.cgi?id=147606

        Reviewed by Benjamin Poulain.

        Initialize a UDateFormat from the generated pattern. Use udat_format()
        to format the value. Make sure that the UDateFormat is cleaned up when
        the DateTimeFormat is deconstructed.

        * runtime/IntlDateTimeFormat.cpp:
        (JSC::IntlDateTimeFormat::~IntlDateTimeFormat):
        (JSC::IntlDateTimeFormat::initializeDateTimeFormat):
        (JSC::IntlDateTimeFormat::format):
        * runtime/IntlDateTimeFormat.h:

2015-12-23  Andy VanWagoner  <thetalecrafter@gmail.com>

        [INTL] Implement String.prototype.localeCompare in ECMA-402
        https://bugs.webkit.org/show_bug.cgi?id=147607

        Reviewed by Benjamin Poulain.

        Add localeCompare in builtin JavaScript that delegates comparing to Intl.Collator.
        Keep existing native implementation for use if INTL flag is disabled.
        For the common case where no locale or options are specified, avoid creating
        a new collator and just use the prototype which is initialized with the defaults.

        * CMakeLists.txt:
        * DerivedSources.make:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * builtins/StringPrototype.js: Added.
        (localeCompare):
        * runtime/StringPrototype.cpp:
        (JSC::StringPrototype::finishCreation):

2015-12-23  Benjamin Poulain  <benjamin@webkit.org>

        Fix x86_64 after r194388

        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::appendShift):
        (JSC::B3::Air::LowerToAir::lower):
        (JSC::B3::Air::LowerToAir::lowerX86Div):

2015-12-23  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Get the JavaScriptCore framework to build on ARM64 with B3 enabled
        https://bugs.webkit.org/show_bug.cgi?id=152503

        Reviewed by Filip Pizlo.

        It is not working but it builds.

        * assembler/ARM64Assembler.h:
        (JSC::ARM64Assembler::vand):
        (JSC::ARM64Assembler::vectorDataProcessing2Source):
        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::add32):
        (JSC::MacroAssemblerARM64::add64):
        (JSC::MacroAssemblerARM64::countLeadingZeros64):
        (JSC::MacroAssemblerARM64::not32):
        (JSC::MacroAssemblerARM64::not64):
        (JSC::MacroAssemblerARM64::zeroExtend16To32):
        (JSC::MacroAssemblerARM64::signExtend16To32):
        (JSC::MacroAssemblerARM64::zeroExtend8To32):
        (JSC::MacroAssemblerARM64::signExtend8To32):
        (JSC::MacroAssemblerARM64::addFloat):
        (JSC::MacroAssemblerARM64::ceilFloat):
        (JSC::MacroAssemblerARM64::branchDouble):
        (JSC::MacroAssemblerARM64::branchFloat):
        (JSC::MacroAssemblerARM64::divFloat):
        (JSC::MacroAssemblerARM64::moveZeroToDouble):
        (JSC::MacroAssemblerARM64::moveFloatTo32):
        (JSC::MacroAssemblerARM64::move32ToFloat):
        (JSC::MacroAssemblerARM64::moveConditionallyDouble):
        (JSC::MacroAssemblerARM64::moveConditionallyFloat):
        (JSC::MacroAssemblerARM64::moveConditionallyAfterFloatingPointCompare):
        (JSC::MacroAssemblerARM64::mulFloat):
        (JSC::MacroAssemblerARM64::andDouble):
        (JSC::MacroAssemblerARM64::andFloat):
        (JSC::MacroAssemblerARM64::sqrtFloat):
        (JSC::MacroAssemblerARM64::subFloat):
        (JSC::MacroAssemblerARM64::signExtend32ToPtr):
        (JSC::MacroAssemblerARM64::moveConditionally32):
        (JSC::MacroAssemblerARM64::moveConditionally64):
        (JSC::MacroAssemblerARM64::moveConditionallyTest32):
        (JSC::MacroAssemblerARM64::moveConditionallyTest64):
        (JSC::MacroAssemblerARM64::test32):
        (JSC::MacroAssemblerARM64::setCarry):
        (JSC::MacroAssemblerARM64::jumpAfterFloatingPointCompare):
        * assembler/MacroAssemblerX86.h:
        (JSC::MacroAssemblerX86::moveDoubleToInts):
        (JSC::MacroAssemblerX86::moveIntsToDouble):
        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::move32ToFloat):
        (JSC::MacroAssemblerX86Common::moveFloatTo32):
        (JSC::MacroAssemblerX86Common::moveInt32ToPacked): Deleted.
        (JSC::MacroAssemblerX86Common::movePackedToInt32): Deleted.
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::appendShift):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/air/AirInstInlines.h:
        (JSC::B3::Air::isX86DivHelperValid):
        * b3/air/AirOpcode.opcodes:
        * jit/AssemblyHelpers.h:
        (JSC::AssemblyHelpers::emitFunctionEpilogueWithEmptyFrame):
        (JSC::AssemblyHelpers::emitFunctionEpilogue):
        * jit/FPRInfo.h:
        (JSC::FPRInfo::toArgumentRegister):

2015-12-23  Andy VanWagoner  <andy@instructure.com>

        [INTL] Implement Intl.DateTimeFormat.prototype.resolvedOptions ()
        https://bugs.webkit.org/show_bug.cgi?id=147603

        Reviewed by Benjamin Poulain.

        Implements InitializeDateTimeFormat and related abstract operations
        using ICU. Lazy initialization is used for DateTimeFormat.prototype.
        Refactor to align with Collator work.

        * icu/unicode/udatpg.h: Added.
        * icu/unicode/unumsys.h: Added.
        * runtime/CommonIdentifiers.h:
        * runtime/IntlDateTimeFormat.cpp:
        (JSC::defaultTimeZone):
        (JSC::canonicalizeTimeZoneName):
        (JSC::localeData):
        (JSC::toDateTimeOptions):
        (JSC::IntlDateTimeFormat::setFormatsFromPattern):
        (JSC::IntlDateTimeFormat::initializeDateTimeFormat):
        (JSC::IntlDateTimeFormat::weekdayString):
        (JSC::IntlDateTimeFormat::eraString):
        (JSC::IntlDateTimeFormat::yearString):
        (JSC::IntlDateTimeFormat::monthString):
        (JSC::IntlDateTimeFormat::dayString):
        (JSC::IntlDateTimeFormat::hourString):
        (JSC::IntlDateTimeFormat::minuteString):
        (JSC::IntlDateTimeFormat::secondString):
        (JSC::IntlDateTimeFormat::timeZoneNameString):
        (JSC::IntlDateTimeFormat::resolvedOptions):
        (JSC::IntlDateTimeFormat::format):
        (JSC::IntlDateTimeFormatFuncFormatDateTime): Deleted.
        * runtime/IntlDateTimeFormat.h:
        * runtime/IntlDateTimeFormatConstructor.cpp:
        (JSC::constructIntlDateTimeFormat):
        (JSC::callIntlDateTimeFormat):
        * runtime/IntlDateTimeFormatPrototype.cpp:
        (JSC::IntlDateTimeFormatFuncFormatDateTime):
        (JSC::IntlDateTimeFormatPrototypeGetterFormat):
        (JSC::IntlDateTimeFormatPrototypeFuncResolvedOptions):
        * runtime/IntlObject.cpp:
        (JSC::resolveLocale):
        (JSC::getNumberingSystemsForLocale):
        * runtime/IntlObject.h:

2015-12-22  Filip Pizlo  <fpizlo@apple.com>

        REGRESSION(194382): FTL B3 no longer runs V8/encrypt
        https://bugs.webkit.org/show_bug.cgi?id=152519

        Reviewed by Saam Barati.

        A "Move Imm, Tmp" instruction should turn into "Move32 Imm, Tmp" if the Tmp is spilled to a
        32-bit slot. Changing where we check isTmp() achieves this. Since all of the logic is only
        relevant to when we spill without introducing a Tmp, and since a Move does not have a "Move Addr,
        Addr" form, this code ensures that the logic only happens for "Tmp, Tmp" and "Imm, Tmp".

        * b3/air/AirIteratedRegisterCoalescing.cpp:
        * dfg/DFGOperations.cpp:

2015-12-22  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should use the right type for comparison slow paths
        https://bugs.webkit.org/show_bug.cgi?id=152521

        Reviewed by Saam Barati.

        Fixes a small goof that was leading to B3 validation failures.

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::nonSpeculativeCompare):

2015-12-22  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should be able to run richards
        https://bugs.webkit.org/show_bug.cgi?id=152514

        Reviewed by Michael Saboff.

        This came down to a liveness bug and a register allocation bug.

        The liveness bug was that the code that determined whether we should go around the fixpoint
        assumed that BitVector::quickSet() would return true if the bit changed state from false to
        true. That's not how it works. It returns the old value of the bit, so it will return false
        if the bit changed from false to true. Since there is already a lot of code that relies on
        this behavior, I fixed Liveness instead of changing BitVector.

        The register allocation bug was that we weren't guarding some checks of tmp()'s with checks
        that the Arg isTmp().

        The liveness took a long time to track down, and I needed to add a lot of dumping to do it.
        It's now possible to dump more of the liveness states, including liveAtHead. I found this
        extremely helpful, so I removed the code that cleared liveAtHead.

        * b3/air/AirIteratedRegisterCoalescing.cpp:
        * b3/air/AirLiveness.h:
        (JSC::B3::Air::AbstractLiveness::AbstractLiveness):
        (JSC::B3::Air::AbstractLiveness::Iterable::Iterable):
        (JSC::B3::Air::AbstractLiveness::Iterable::iterator::iterator):
        (JSC::B3::Air::AbstractLiveness::Iterable::iterator::operator*):
        (JSC::B3::Air::AbstractLiveness::Iterable::iterator::operator++):
        (JSC::B3::Air::AbstractLiveness::Iterable::iterator::operator==):
        (JSC::B3::Air::AbstractLiveness::Iterable::iterator::operator!=):
        (JSC::B3::Air::AbstractLiveness::Iterable::begin):
        (JSC::B3::Air::AbstractLiveness::Iterable::end):
        (JSC::B3::Air::AbstractLiveness::liveAtHead):
        (JSC::B3::Air::AbstractLiveness::liveAtTail):
        * b3/air/AirStackSlot.h:
        (WTF::printInternal):
        * ftl/FTLOSRExitCompiler.cpp:
        (JSC::FTL::compileFTLOSRExit):

2015-12-22  Saam barati  <sbarati@apple.com>

        Cloop build fix after https://bugs.webkit.org/show_bug.cgi?id=152511.

        Unreviewed build fix.

        * runtime/Options.cpp:
        (JSC::recomputeDependentOptions):

2015-12-22  Saam barati  <sbarati@apple.com>

        Work around issue in bug #152510
        https://bugs.webkit.org/show_bug.cgi?id=152511

        Reviewed by Filip Pizlo.

        * runtime/Options.cpp:
        (JSC::recomputeDependentOptions):

2015-12-22  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 does not logicalNot correctly
        https://bugs.webkit.org/show_bug.cgi?id=152512

        Reviewed by Saam Barati.

        I'm working on a bug where V8/richards does not run correctly. I noticed that the codegen was
        doing a log of Not32's followed by branches, which smelled like badness. To debug this, I
        needed B3's origins to dump as something other than a hexed pointer to a node. The node index
        would be better. So, I added the notion of an origin printer to Procedure.

        The bug was easy enough to fix. This introduces Output::logicalNot(). In LLVM, it's the same
        as bitNot(). In B3, it's compiled to Equal(value, 0). We could have also compiled it to
        BitXor(value, 1), except that B3 will strength-reduce to that anyway whenever it's safe. It's
        sort of nice that right now, you could use logicalNot() on non-bool values and get C-like
        behavior.

        Richards still doesn't run, though. There are more bugs!

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/B3BasicBlock.cpp:
        (JSC::B3::BasicBlock::dump):
        (JSC::B3::BasicBlock::deepDump):
        * b3/B3BasicBlock.h:
        (JSC::B3::BasicBlock::frequency):
        (JSC::B3::DeepBasicBlockDump::DeepBasicBlockDump):
        (JSC::B3::DeepBasicBlockDump::dump):
        (JSC::B3::deepDump):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::run):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3Origin.h:
        (JSC::B3::Origin::data):
        * b3/B3OriginDump.h: Added.
        (JSC::B3::OriginDump::OriginDump):
        (JSC::B3::OriginDump::dump):
        * b3/B3Procedure.cpp:
        (JSC::B3::Procedure::~Procedure):
        (JSC::B3::Procedure::printOrigin):
        (JSC::B3::Procedure::addBlock):
        (JSC::B3::Procedure::dump):
        * b3/B3Procedure.h:
        (JSC::B3::Procedure::setOriginPrinter):
        * b3/B3Value.cpp:
        (JSC::B3::Value::dumpChildren):
        (JSC::B3::Value::deepDump):
        * b3/B3Value.h:
        (JSC::B3::DeepValueDump::DeepValueDump):
        (JSC::B3::DeepValueDump::dump):
        (JSC::B3::deepDump):
        * ftl/FTLB3Output.cpp:
        (JSC::FTL::Output::lockedStackSlot):
        (JSC::FTL::Output::bitNot):
        (JSC::FTL::Output::logicalNot):
        (JSC::FTL::Output::load):
        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::aShr):
        (JSC::FTL::Output::lShr):
        (JSC::FTL::Output::ctlz32):
        (JSC::FTL::Output::addWithOverflow32):
        (JSC::FTL::Output::lessThanOrEqual):
        (JSC::FTL::Output::doubleEqual):
        (JSC::FTL::Output::doubleEqualOrUnordered):
        (JSC::FTL::Output::doubleNotEqualOrUnordered):
        (JSC::FTL::Output::doubleLessThan):
        (JSC::FTL::Output::doubleLessThanOrEqual):
        (JSC::FTL::Output::doubleGreaterThan):
        (JSC::FTL::Output::doubleGreaterThanOrEqual):
        (JSC::FTL::Output::doubleNotEqualAndOrdered):
        (JSC::FTL::Output::doubleLessThanOrUnordered):
        (JSC::FTL::Output::doubleLessThanOrEqualOrUnordered):
        (JSC::FTL::Output::doubleGreaterThanOrUnordered):
        (JSC::FTL::Output::doubleGreaterThanOrEqualOrUnordered):
        (JSC::FTL::Output::isZero32):
        (JSC::FTL::Output::notZero32):
        (JSC::FTL::Output::addIncomingToPhi):
        (JSC::FTL::Output::bitCast):
        (JSC::FTL::Output::bitNot): Deleted.
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCheckArray):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileGetTypedArrayByteOffset):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileLogicalNot):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCallOrConstruct):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileInstanceOfCustom):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCountExecution):
        (JSC::FTL::DFG::LowerDFGToLLVM::boolify):
        (JSC::FTL::DFG::LowerDFGToLLVM::isMisc):
        (JSC::FTL::DFG::LowerDFGToLLVM::isNotBoolean):
        (JSC::FTL::DFG::LowerDFGToLLVM::isBoolean):
        (JSC::FTL::DFG::LowerDFGToLLVM::unboxBoolean):
        (JSC::FTL::DFG::LowerDFGToLLVM::isNotType):
        (JSC::FTL::DFG::LowerDFGToLLVM::speculateObject):
        * ftl/FTLOutput.h:
        (JSC::FTL::Output::aShr):
        (JSC::FTL::Output::lShr):
        (JSC::FTL::Output::bitNot):
        (JSC::FTL::Output::logicalNot):
        (JSC::FTL::Output::insertElement):
        * ftl/FTLState.cpp:
        (JSC::FTL::State::State):

2015-12-22  Keith Miller  <keith_miller@apple.com>

        Remove OverridesHasInstance from TypeInfoFlags
        https://bugs.webkit.org/show_bug.cgi?id=152005

        Reviewed by Saam Barati.

        Currently, we have three TypeInfo flags associated with instanceof behavior,
        ImplementsHasInstance, ImplementDefaultHasInstance, and OverridesHasInstance. This patch
        removes the third and moves the first to the out of line flags. In theory, we should only
        need one flag but removing ImplementsHasInstance is more involved and should be done in a
        separate patch.

        * API/JSCallbackConstructor.h:
        * API/JSCallbackObject.h:
        * jit/JITOpcodes.cpp:
        (JSC::JIT::emit_op_overrides_has_instance):
        * jit/JITOpcodes32_64.cpp:
        (JSC::JIT::emit_op_overrides_has_instance):
        * llint/LLIntData.cpp:
        (JSC::LLInt::Data::performAssertions):
        * llint/LowLevelInterpreter.asm:
        * runtime/InternalFunction.h:
        * runtime/JSBoundFunction.h:
        * runtime/JSCallee.h:
        * runtime/JSTypeInfo.h:
        (JSC::TypeInfo::implementsHasInstance):
        (JSC::TypeInfo::TypeInfo): Deleted.
        (JSC::TypeInfo::overridesHasInstance): Deleted.
        * runtime/NumberConstructor.h:

2015-12-22  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should do tail calls
        https://bugs.webkit.org/show_bug.cgi?id=152494

        Reviewed by Michael Saboff.

        OMG this was so easy.

        The only shady part is that I broke a layering rule that we had so far been following: B3 was
        sitting below the JSC runtime, and did not use JS-specific types. No more, since B3::ValueRep
        can now turn itself into a ValueRecovery for a JSValue. This small feature makes a huge
        difference for the readability of tail call code: it makes it plain that the call frame
        shuffler is basically just directly consuming the stackmap generation params, and insofar as
        there is any data transformation, it's just because it uses different classes to say the same
        thing.

        I think we should avoid adding too many JS-specific things to B3. But, so long as it's still
        possible to use B3 to compile things that aren't JS, I think we'll be fine.

        * b3/B3ValueRep.cpp:
        (JSC::B3::ValueRep::dump):
        (JSC::B3::ValueRep::emitRestore):
        (JSC::B3::ValueRep::recoveryForJSValue):
        * b3/B3ValueRep.h:
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileTailCall):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCallOrConstructVarargs):
        * test/stress/ftl-tail-call.js: Added.

2015-12-21  Mark Lam  <mark.lam@apple.com>

        Snippefy op_negate for the baseline JIT.
        https://bugs.webkit.org/show_bug.cgi?id=152447

        Reviewed by Benjamin Poulain.

        * CMakeLists.txt:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * jit/JITArithmetic.cpp:
        (JSC::JIT::emit_op_unsigned):
        (JSC::JIT::emit_op_negate):
        (JSC::JIT::emitSlow_op_negate):
        (JSC::JIT::emitBitBinaryOpFastPath):
        * jit/JITArithmetic32_64.cpp:
        (JSC::JIT::emit_compareAndJump):
        (JSC::JIT::emit_op_negate): Deleted.
        (JSC::JIT::emitSlow_op_negate): Deleted.
        * jit/JITNegGenerator.cpp: Added.
        (JSC::JITNegGenerator::generateFastPath):
        * jit/JITNegGenerator.h: Added.
        (JSC::JITNegGenerator::JITNegGenerator):
        (JSC::JITNegGenerator::didEmitFastPath):
        (JSC::JITNegGenerator::endJumpList):
        (JSC::JITNegGenerator::slowPathJumpList):

2015-12-21  Filip Pizlo  <fpizlo@apple.com>

        Address review feedback from Saam.  I should have landed it in r194354.

        * b3/testb3.cpp:
        (JSC::B3::testStore16Arg):

2015-12-21  Filip Pizlo  <fpizlo@apple.com>

        B3 should be able to compile Store16
        https://bugs.webkit.org/show_bug.cgi?id=152493

        Reviewed by Saam Barati.

        This adds comprehensive Store16 support to our assembler, Air, and B3->Air lowering.

        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::store16):
        * assembler/X86Assembler.h:
        (JSC::X86Assembler::movb_rm):
        (JSC::X86Assembler::movw_rm):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::lower):
        * b3/air/AirOpcode.opcodes:
        * b3/testb3.cpp:
        (JSC::B3::testStorePartial8BitRegisterOnX86):
        (JSC::B3::testStore16Arg):
        (JSC::B3::testStore16Imm):
        (JSC::B3::testTrunc):
        (JSC::B3::run):

2015-12-21  Filip Pizlo  <fpizlo@apple.com>

        Unreviewed, remove highBitsAreZero(), it's unused.

        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::run):
        (JSC::B3::Air::LowerToAir::shouldCopyPropagate):
        (JSC::B3::Air::LowerToAir::highBitsAreZero): Deleted.

2015-12-21  Csaba Osztrogonác  <ossy@webkit.org>

        Unreviewed, fix the !FTL_USES_B3 build after r194334.

        * ftl/FTLLowerDFGToLLVM.cpp: Mark forwarding unused variable.
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCallOrConstructVarargs):

2015-12-21  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should do doubleToInt32
        https://bugs.webkit.org/show_bug.cgi?id=152484

        Reviewed by Saam Barati.

        We used to have a DToI32 opcode in B3 that we never implemented. This removes that opcode,
        since double-to-int conversion has dramatically different semantics on different
        architectures. We let FTL get the conversion instruction it wants by using a patchpoint.

        * b3/B3Opcode.cpp:
        (WTF::printInternal):
        * b3/B3Opcode.h:
        * b3/B3Validate.cpp:
        * b3/B3Value.cpp:
        (JSC::B3::Value::effects):
        (JSC::B3::Value::key):
        (JSC::B3::Value::typeFor):
        * b3/B3ValueKey.cpp:
        (JSC::B3::ValueKey::materialize):
        * ftl/FTLB3Output.cpp:
        (JSC::FTL::Output::Output):
        (JSC::FTL::Output::appendTo):
        (JSC::FTL::Output::lockedStackSlot):
        (JSC::FTL::Output::load):
        (JSC::FTL::Output::doublePowi):
        (JSC::FTL::Output::hasSensibleDoubleToInt):
        (JSC::FTL::Output::doubleToInt):
        (JSC::FTL::Output::doubleToUInt):
        (JSC::FTL::Output::load8SignExt32):
        (JSC::FTL::Output::load8ZeroExt32):
        (JSC::FTL::Output::load16SignExt32):
        (JSC::FTL::Output::load16ZeroExt32):
        (JSC::FTL::Output::store):
        (JSC::FTL::Output::store32As8):
        (JSC::FTL::Output::store32As16):
        (JSC::FTL::Output::branch):
        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::doubleLog):
        (JSC::FTL::Output::signExt32To64):
        (JSC::FTL::Output::zeroExt):
        (JSC::FTL::Output::zeroExtPtr):
        (JSC::FTL::Output::intToDouble):
        (JSC::FTL::Output::unsignedToDouble):
        (JSC::FTL::Output::castToInt32):
        (JSC::FTL::Output::hasSensibleDoubleToInt): Deleted.
        (JSC::FTL::Output::sensibleDoubleToInt): Deleted.
        (JSC::FTL::Output::fpToInt32): Deleted.
        (JSC::FTL::Output::fpToUInt32): Deleted.
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithPow):
        (JSC::FTL::DFG::LowerDFGToLLVM::compilePutByVal):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileSwitch):
        (JSC::FTL::DFG::LowerDFGToLLVM::doubleToInt32):
        (JSC::FTL::DFG::LowerDFGToLLVM::sensibleDoubleToInt32):
        (JSC::FTL::DFG::LowerDFGToLLVM::convertDoubleToInt32):
        * ftl/FTLOutput.h:
        (JSC::FTL::Output::hasSensibleDoubleToInt):
        (JSC::FTL::Output::doubleToInt):
        (JSC::FTL::Output::doubleToUInt):
        (JSC::FTL::Output::signExt32To64):
        (JSC::FTL::Output::zeroExt):

2015-12-21  Skachkov Oleksandr  <gskachkov@gmail.com>

        Unexpected exception assigning to this._property inside arrow function
        https://bugs.webkit.org/show_bug.cgi?id=152028

        Reviewed by Saam Barati.

        The issue appeared in case if in arrow function created base-level lexical envioronment, and in this case 
        |this| value was loaded from wrong scope. The problem was that loading of the |this| happened too early when
        compiling bytecode because the bytecode generators's scope stack wasn't in sync with runtime scope stack.
        To fix issue loading of |this| was moved after initializeDefaultParameterValuesAndSetupFunctionScopeStack 
        in BytecodeGenerator.cpp   

        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::BytecodeGenerator):
        * tests/stress/arrowfunction-lexical-bind-this-2.js:

2015-12-21  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should do vararg calls
        https://bugs.webkit.org/show_bug.cgi?id=152468

        Reviewed by Benjamin Poulain.

        This adds FTL->B3 lowering of all kinds of varargs calls - forwarding or not, tail or not,
        and construct or not. Like all other such lowerings, all of the code is in one place in
        FTLLower.

        I removed code for varargs and exception spill slots from the B3 path, since it won't need
        it. The plan is to rely on B3 doing the spilling for us by using some combination of early
        clobber and late use.

        This adds ValueRep::emitRestore(), a helpful method for emitting code to restore any ValueRep
        into any 64-bit Reg (FPR or GPR).

        I wrote new tests for vararg calls, because I wasn't sure which of the existing ones we can
        run. These are short-running tests, so I'm not worried about bloating our test suite.

        * b3/B3ValueRep.cpp:
        (JSC::B3::ValueRep::dump):
        (JSC::B3::ValueRep::emitRestore):
        * b3/B3ValueRep.h:
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::lower):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCallOrConstructVarargs):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileInvalidationPoint):
        * ftl/FTLState.h:
        * tests/stress/varargs-no-forward.js: Added.
        * tests/stress/varargs-simple.js: Added.
        * tests/stress/varargs-two-level.js: Added.

2015-12-18  Mark Lam  <mark.lam@apple.com>

        Add unary operator tests to compare JIT and LLINT results.
        https://bugs.webkit.org/show_bug.cgi?id=152453

        Reviewed by Benjamin Poulain.

        Also fixed a few things in the binary-op-test.js.

        * tests/stress/op_negate.js: Added.
        (o1.valueOf):
        * tests/stress/op_postdec.js: Added.
        (o1.valueOf):
        * tests/stress/op_postinc.js: Added.
        (o1.valueOf):
        * tests/stress/op_predec.js: Added.
        (o1.valueOf):
        * tests/stress/op_preinc.js: Added.
        (o1.valueOf):
        * tests/stress/resources/binary-op-test.js:
        (stringifyIfNeeded):
        (isIdentical):
        (run):
        * tests/stress/resources/unary-op-test.js: Added.
        (stringifyIfNeeded):
        (generateBinaryTests):
        (isIdentical):
        (runTest):
        (run):

2015-12-21  Ryan Haddad  <ryanhaddad@apple.com>

        Unreviewed, rolling out r194328.

        This change appears to have caused failures in JSC tests

        Reverted changeset:

        "[INTL] Implement String.prototype.localeCompare in ECMA-402"
        https://bugs.webkit.org/show_bug.cgi?id=147607
        http://trac.webkit.org/changeset/194328

2015-12-21  Filip Pizlo  <fpizlo@apple.com>

        B3->Air lowering incorrectly copy-propagates over ZExt32's
        https://bugs.webkit.org/show_bug.cgi?id=152365

        Reviewed by Benjamin Poulain.

        The instruction selector thinks that Value's that return Int32's are going to always be lowered
        to instructions that zero-extend the destination. But this isn't actually true. If you have an
        Add32 with a destination on the stack (i.e. spilled) then it only writes 4 bytes. Then, the
        filler will load 8 bytes from the stack at the point of use. So, the use of the Add32 will see
        garbage in the high bits.

        The fact that the spiller chose to use 8 bytes for a Tmp that gets defined by an Add32 is a
        pretty sad bug, but:

        - It's entirely up to the spiller to decide how many bytes to use for a Tmp, since we do not
          ascribe a type to Tmps. We could ascribe types to Tmps, but then coalescing would become
          harder. Our goal is to fix the bug while still enabling coalescing in cases like "a[i]" where
          "i" is a 32-bit integer that is computed using operations that already do zero-extension.

        - More broadly, it's strange that the instruction selector decides whether a Value will be
          lowered to something that zero-extends. That's too constraining, since the most optimal
          instruction selection might involve something that doesn't zero-extend in cases of spilling, so
          the zero-extension should only happen if it's actually needed. This means that we need to
          understand which Air instructions cause zero-extensions.

        - If we know which Air instructions cause zero-extensions, then we don't need the instruction
          selector to copy-propagate ZExt32's. We have copy-propagation in Air thanks to the register
          allocator.

        In fact, the register allocator is exactly where all of the pieces come together. It's there that
        we want to know which operations zero-extend and which don't. It also wants to know how many bits
        of a Tmp each instruction reads. Armed with that information, the register allocator can emit
        more optimal spill code, use less stack space for spill slots, and coalesce Move32's. As a bonus,
        on X86, it replaces Move's with Move32's whenever it can. On X86, Move32 is cheaper.

        This fixes a crash bug in V8/encrypt. After fixing this, I only needed two minor fixes to get
        V8/encrypt to run. We're about 10% behind LLVM on steady state throughput on this test. It
        appears to be mostly due to excessive spilling caused by CCall slow paths. That's fixable: we
        could make CCalls on slow paths use a variant of CCallSpecial that promises not to clobber any
        registers, and then have it emit spill code around the call itself. LLVM probably gets this
        optimization from its live range splitting.

        I tried writing a regression test. The problem is that you need garbage on the stack for this to
        work, and I didn't feel like writing a flaky test. It appears that running V8/encrypt will cover
        this, so we do have coverage.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * assembler/AbstractMacroAssembler.h:
        (JSC::isX86):
        (JSC::isX86_64):
        (JSC::optimizeForARMv7IDIVSupported):
        (JSC::optimizeForX86):
        (JSC::optimizeForX86_64):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::highBitsAreZero):
        (JSC::B3::Air::LowerToAir::shouldCopyPropagate):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3PatchpointSpecial.cpp:
        (JSC::B3::PatchpointSpecial::forEachArg):
        * b3/B3StackmapSpecial.cpp:
        (JSC::B3::StackmapSpecial::forEachArgImpl):
        * b3/B3Value.h:
        * b3/air/AirAllocateStack.cpp:
        (JSC::B3::Air::allocateStack):
        * b3/air/AirArg.cpp:
        (WTF::printInternal):
        * b3/air/AirArg.h:
        (JSC::B3::Air::Arg::pointerWidth):
        (JSC::B3::Air::Arg::isAnyUse):
        (JSC::B3::Air::Arg::isColdUse):
        (JSC::B3::Air::Arg::isEarlyUse):
        (JSC::B3::Air::Arg::isDef):
        (JSC::B3::Air::Arg::isZDef):
        (JSC::B3::Air::Arg::widthForB3Type):
        (JSC::B3::Air::Arg::conservativeWidth):
        (JSC::B3::Air::Arg::minimumWidth):
        (JSC::B3::Air::Arg::bytes):
        (JSC::B3::Air::Arg::widthForBytes):
        (JSC::B3::Air::Arg::Arg):
        (JSC::B3::Air::Arg::forEachTmp):
        * b3/air/AirCCallSpecial.cpp:
        (JSC::B3::Air::CCallSpecial::forEachArg):
        * b3/air/AirEliminateDeadCode.cpp:
        (JSC::B3::Air::eliminateDeadCode):
        * b3/air/AirFixPartialRegisterStalls.cpp:
        (JSC::B3::Air::fixPartialRegisterStalls):
        * b3/air/AirInst.cpp:
        (JSC::B3::Air::Inst::hasArgEffects):
        * b3/air/AirInst.h:
        (JSC::B3::Air::Inst::forEachTmpFast):
        (JSC::B3::Air::Inst::forEachTmp):
        * b3/air/AirInstInlines.h:
        (JSC::B3::Air::Inst::forEachTmpWithExtraClobberedRegs):
        * b3/air/AirIteratedRegisterCoalescing.cpp:
        * b3/air/AirLiveness.h:
        (JSC::B3::Air::AbstractLiveness::AbstractLiveness):
        (JSC::B3::Air::AbstractLiveness::LocalCalc::execute):
        * b3/air/AirOpcode.opcodes:
        * b3/air/AirSpillEverything.cpp:
        (JSC::B3::Air::spillEverything):
        * b3/air/AirTmpWidth.cpp: Added.
        (JSC::B3::Air::TmpWidth::TmpWidth):
        (JSC::B3::Air::TmpWidth::~TmpWidth):
        * b3/air/AirTmpWidth.h: Added.
        (JSC::B3::Air::TmpWidth::width):
        (JSC::B3::Air::TmpWidth::defWidth):
        (JSC::B3::Air::TmpWidth::useWidth):
        (JSC::B3::Air::TmpWidth::Widths::Widths):
        * b3/air/AirUseCounts.h:
        (JSC::B3::Air::UseCounts::UseCounts):
        * b3/air/opcode_generator.rb:
        * b3/testb3.cpp:
        (JSC::B3::testCheckMegaCombo):
        (JSC::B3::testCheckTrickyMegaCombo):
        (JSC::B3::testCheckTwoMegaCombos):
        (JSC::B3::run):

2015-12-21  Andy VanWagoner  <thetalecrafter@gmail.com>

        [INTL] Implement String.prototype.localeCompare in ECMA-402
        https://bugs.webkit.org/show_bug.cgi?id=147607

        Reviewed by Darin Adler.

        Add localeCompare in builtin JavaScript that delegates comparing to Intl.Collator.
        Keep existing native implementation for use if INTL flag is disabled.

        * CMakeLists.txt:
        * DerivedSources.make:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * builtins/StringPrototype.js: Added.
        (localeCompare):
        * runtime/StringPrototype.cpp:
        (JSC::StringPrototype::finishCreation):

2015-12-18  Filip Pizlo  <fpizlo@apple.com>

        Implement compareDouble in B3/Air
        https://bugs.webkit.org/show_bug.cgi?id=150903

        Reviewed by Benjamin Poulain.

        A hole in our coverage is that we don't fuse a double comparison into a branch, then we will
        crash in the instruction selector. Obviously, we *really* want to fuse double comparisons,
        but we can't guarantee that this will always happen.

        This also removes all uses of WTF::Dominators verification, since it's extremely slow even in
        a release build. This speeds up testb3 with validateGraphAtEachPhase=true by an order of
        magnitude.

        * assembler/MacroAssembler.h:
        (JSC::MacroAssembler::moveDoubleConditionallyFloat):
        (JSC::MacroAssembler::compareDouble):
        (JSC::MacroAssembler::compareFloat):
        (JSC::MacroAssembler::lea):
        * b3/B3Dominators.h:
        (JSC::B3::Dominators::Dominators):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::createCompare):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/air/AirOpcode.opcodes:
        * b3/testb3.cpp:
        (JSC::B3::testCompare):
        (JSC::B3::testEqualDouble):
        (JSC::B3::simpleFunction):
        (JSC::B3::run):
        * dfg/DFGDominators.h:
        (JSC::DFG::Dominators::Dominators):

2015-12-19  Dan Bernstein  <mitz@apple.com>

        [Mac] WebKit contains dead source code for OS X Mavericks and earlier
        https://bugs.webkit.org/show_bug.cgi?id=152462

        Reviewed by Alexey Proskuryakov.

        - Removed build setting definitions for OS X 10.9 and earlier, and simplified defintions
          that became uniform across all OS X versions as a result:

        * Configurations/DebugRelease.xcconfig:
        * Configurations/FeatureDefines.xcconfig:
        * Configurations/Version.xcconfig:

        * API/JSBase.h: Removed check against __MAC_OS_X_VERSION_MIN_REQUIRED that was always true.

2015-12-19  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Streamline Tmp indexing inside the register allocator
        https://bugs.webkit.org/show_bug.cgi?id=152420

        Reviewed by Filip Pizlo.

        AirIteratedRegisterCoalescing has been accumulating a bit of mess over time.

        When it started, every map addressed by Tmp was using Tmp hashing.
        That caused massive performance problems. Everything perf sensitive was moved
        to direct array addressing by the absolute Tmp index. This left the code
        with half of the function using Tmp, the other half using indices.

        With this patch, almost everything is moved to absolute indexing.
        There are a few advantages to this:
        -No more conversion churn for Floating Point registers.
        -Most of the functions can now be shared between GP and FP.
        -A bit of clean up since the core algorithm only deals with integers now.

        This patch also changes the index type to be a template argument.
        That will allow future specialization of "m_interferenceEdges" based
        on the expected problem size.

        Finally, the code related to the program modification (register assignment
        and spilling) was moved to the wrapper "IteratedRegisterCoalescing".

        The current split is:
        -AbstractColoringAllocator: common core. Share as much as possible between
         GP and FP.
        -ColoringAllocator: the remaining parts of the algorithm, everything that
         is specific to GP, FP.
        -IteratedRegisterCoalescing: the "iterated" part of the algorithm.
         Try to allocate and modify the code as needed.

        The long term plan is:
        -Move selectSpill() and the coloring loop to AbstractColoringAllocator.
        -Specialize m_interferenceEdges to make it faster.

        * b3/air/AirIteratedRegisterCoalescing.cpp:
        * b3/air/AirTmpInlines.h:
        (JSC::B3::Air::AbsoluteTmpMapper<Arg::GP>::lastMachineRegisterIndex):
        (JSC::B3::Air::AbsoluteTmpMapper<Arg::FP>::lastMachineRegisterIndex):

2015-12-19  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] FTLB3Output generates some invalid ZExt32
        https://bugs.webkit.org/show_bug.cgi?id=151905

        Reviewed by Filip Pizlo.

        FTLLowerDFGToLLVM calls zeroExt() to int32 in some cases.
        We were generating ZExt32 with Int32 as return type :(

        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::zeroExt):

2015-12-19  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Add EqualOrUnordered to B3
        https://bugs.webkit.org/show_bug.cgi?id=152425

        Reviewed by Mark Lam.

        Add EqualOrUnordered to B3 and use it to implements
        FTL::Output's NotEqualAndOrdered.

        * b3/B3ConstDoubleValue.cpp:
        (JSC::B3::ConstDoubleValue::equalOrUnordered):
        * b3/B3ConstDoubleValue.h:
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::createGenericCompare):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3Opcode.cpp:
        (WTF::printInternal):
        * b3/B3Opcode.h:
        * b3/B3ReduceDoubleToFloat.cpp:
        (JSC::B3::reduceDoubleToFloat):
        * b3/B3ReduceStrength.cpp:
        * b3/B3Validate.cpp:
        * b3/B3Value.cpp:
        (JSC::B3::Value::equalOrUnordered):
        (JSC::B3::Value::returnsBool):
        (JSC::B3::Value::effects):
        (JSC::B3::Value::key):
        (JSC::B3::Value::typeFor):
        * b3/B3Value.h:
        * b3/testb3.cpp:
        (JSC::B3::testBranchEqualOrUnorderedArgs):
        (JSC::B3::testBranchNotEqualAndOrderedArgs):
        (JSC::B3::testBranchEqualOrUnorderedDoubleArgImm):
        (JSC::B3::testBranchEqualOrUnorderedFloatArgImm):
        (JSC::B3::testBranchEqualOrUnorderedDoubleImms):
        (JSC::B3::testBranchEqualOrUnorderedFloatImms):
        (JSC::B3::testBranchEqualOrUnorderedFloatWithUselessDoubleConversion):
        (JSC::B3::run):
        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::doubleNotEqualAndOrdered):
        (JSC::FTL::Output::doubleNotEqual): Deleted.
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::boolify):
        * ftl/FTLOutput.h:
        (JSC::FTL::Output::doubleNotEqualAndOrdered):
        (JSC::FTL::Output::doubleNotEqual): Deleted.

2015-12-19  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] B3: Add indexed addressing when lowering BitwiseCast
        https://bugs.webkit.org/show_bug.cgi?id=152432

        Reviewed by Geoffrey Garen.

        The MacroAssembler supports it, we should use it.

        * b3/air/AirOpcode.opcodes:
        * b3/testb3.cpp:
        (JSC::B3::testBitwiseCastOnDoubleInMemoryIndexed):
        (JSC::B3::testBitwiseCastOnInt64InMemoryIndexed):

2015-12-18  Andreas Kling  <akling@apple.com>

        Make JSString::SafeView less of a footgun.
        <https://webkit.org/b/152376>

        Reviewed by Darin Adler.

        Remove the "operator StringView()" convenience helper on JSString::SafeString since that
        made it possible to casually turn the return value from JSString::view() into an unsafe
        StringView local on the stack with this pattern:

            StringView view = someJSValue.toString(exec)->view(exec);

        The JSString* returned by toString() above will go out of scope by the end of the statement
        and does not stick around to protect itself from garbage collection.

        It will now look like this instead:

            JSString::SafeView view = someJSValue.toString(exec)->view(exec);

        To be extra clear, the following is not safe:

            StringView view = someJSValue.toString(exec)->view(exec).get();

        By the end of that statement, the JSString::SafeView goes out of scope, and the JSString*
        is no longer protected from GC.

        I added a couple of forwarding helpers to the SafeView class, and if you need a StringView
        object from it, you can call .get() just like before.

        Finally I also removed the JSString::SafeView() constructor, since nobody was instantiating
        empty SafeView objects anyway. This way we don't have to worry about null members.

        * runtime/ArrayPrototype.cpp:
        (JSC::arrayProtoFuncJoin):
        * runtime/FunctionConstructor.cpp:
        (JSC::constructFunctionSkippingEvalEnabledCheck):
        * runtime/JSGenericTypedArrayViewPrototypeFunctions.h:
        (JSC::genericTypedArrayViewProtoFuncJoin):
        * runtime/JSGlobalObjectFunctions.cpp:
        (JSC::decode):
        (JSC::globalFuncParseInt):
        (JSC::globalFuncParseFloat):
        (JSC::globalFuncEscape):
        (JSC::globalFuncUnescape):
        * runtime/JSONObject.cpp:
        (JSC::JSONProtoFuncParse):
        * runtime/JSString.cpp:
        (JSC::JSString::getPrimitiveNumber):
        (JSC::JSString::toNumber):
        * runtime/JSString.h:
        (JSC::JSString::SafeView::is8Bit):
        (JSC::JSString::SafeView::length):
        (JSC::JSString::SafeView::characters8):
        (JSC::JSString::SafeView::characters16):
        (JSC::JSString::SafeView::operator[]):
        (JSC::JSString::SafeView::SafeView):
        (JSC::JSString::SafeView::get):
        (JSC::JSString::SafeView::operator StringView): Deleted.
        * runtime/StringPrototype.cpp:
        (JSC::stringProtoFuncCharAt):
        (JSC::stringProtoFuncCharCodeAt):
        (JSC::stringProtoFuncIndexOf):
        (JSC::stringProtoFuncNormalize):

2015-12-18  Saam barati  <sbarati@apple.com>

        BytecodeGenerator::pushLexicalScopeInternal and pushLexicalScope should use enums instead of bools
        https://bugs.webkit.org/show_bug.cgi?id=152450

        Reviewed by Geoffrey Garen and Joseph Pecoraro.

        This makes comprehending the call sites of these functions
        easier without looking up the header of the function.

        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::BytecodeGenerator):
        (JSC::BytecodeGenerator::initializeDefaultParameterValuesAndSetupFunctionScopeStack):
        (JSC::BytecodeGenerator::initializeArrowFunctionContextScopeIfNeeded):
        (JSC::BytecodeGenerator::emitPrefillStackTDZVariables):
        (JSC::BytecodeGenerator::pushLexicalScope):
        (JSC::BytecodeGenerator::pushLexicalScopeInternal):
        (JSC::BytecodeGenerator::emitPushFunctionNameScope):
        (JSC::BytecodeGenerator::emitPushCatchScope):
        * bytecompiler/BytecodeGenerator.h:
        (JSC::BytecodeGenerator::lastOpcodeID):
        * bytecompiler/NodesCodegen.cpp:
        (JSC::BlockNode::emitBytecode):
        (JSC::ForNode::emitBytecode):
        (JSC::ForInNode::emitMultiLoopBytecode):
        (JSC::ForOfNode::emitBytecode):
        (JSC::SwitchNode::emitBytecode):
        (JSC::ClassExprNode::emitBytecode):

2015-12-18  Michael Catanzaro  <mcatanzaro@igalia.com>

        Avoid triggering clang's -Wundefined-bool-conversion
        https://bugs.webkit.org/show_bug.cgi?id=152408

        Reviewed by Mark Lam.

        Add ASSERT_THIS_GC_OBJECT_LOOKS_VALID and ASSERT_THIS_GC_OBJECT_INHERITS to avoid use of
        ASSERT(this) by ASSERT_GC_OBJECT_LOOKS_VALID and ASSERT_GC_OBJECT_INHERITS.

        * heap/GCAssertions.h:

2015-12-18  Mark Lam  <mark.lam@apple.com>

        Replace SpecialFastCase profiles with ResultProfiles.
        https://bugs.webkit.org/show_bug.cgi?id=152433

        Reviewed by Saam Barati.

        This is in preparation for upcoming work to enhance the DFG predictions to deal
        with untyped operands.

        This patch also enhances some of the arithmetic slow paths (for the LLINT and
        baseline JIT) to collect result profiling info.  This profiling info is not put
        to use yet. 

        * CMakeLists.txt:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::dumpRareCaseProfile):
        (JSC::CodeBlock::dumpResultProfile):
        (JSC::CodeBlock::printLocationAndOp):
        (JSC::CodeBlock::dumpBytecode):
        (JSC::CodeBlock::shrinkToFit):
        (JSC::CodeBlock::dumpValueProfiles):
        (JSC::CodeBlock::rareCaseProfileCountForBytecodeOffset):
        (JSC::CodeBlock::resultProfileForBytecodeOffset):
        (JSC::CodeBlock::updateResultProfileForBytecodeOffset):
        (JSC::CodeBlock::capabilityLevel):
        * bytecode/CodeBlock.h:
        (JSC::CodeBlock::couldTakeSlowCase):
        (JSC::CodeBlock::addResultProfile):
        (JSC::CodeBlock::numberOfResultProfiles):
        (JSC::CodeBlock::specialFastCaseProfileCountForBytecodeOffset):
        (JSC::CodeBlock::couldTakeSpecialFastCase):
        (JSC::CodeBlock::addSpecialFastCaseProfile): Deleted.
        (JSC::CodeBlock::numberOfSpecialFastCaseProfiles): Deleted.
        (JSC::CodeBlock::specialFastCaseProfile): Deleted.
        (JSC::CodeBlock::specialFastCaseProfileForBytecodeOffset): Deleted.
        * bytecode/ValueProfile.cpp: Added.
        (WTF::printInternal):
        * bytecode/ValueProfile.h:
        (JSC::getRareCaseProfileBytecodeOffset):
        (JSC::ResultProfile::ResultProfile):
        (JSC::ResultProfile::bytecodeOffset):
        (JSC::ResultProfile::specialFastPathCount):
        (JSC::ResultProfile::didObserveNonInt32):
        (JSC::ResultProfile::didObserveDouble):
        (JSC::ResultProfile::didObserveNonNegZeroDouble):
        (JSC::ResultProfile::didObserveNegZeroDouble):
        (JSC::ResultProfile::didObserveNonNumber):
        (JSC::ResultProfile::didObserveInt32Overflow):
        (JSC::ResultProfile::setObservedNonNegZeroDouble):
        (JSC::ResultProfile::setObservedNegZeroDouble):
        (JSC::ResultProfile::setObservedNonNumber):
        (JSC::ResultProfile::setObservedInt32Overflow):
        (JSC::ResultProfile::addressOfFlags):
        (JSC::ResultProfile::addressOfSpecialFastPathCount):
        (JSC::ResultProfile::hasBits):
        (JSC::ResultProfile::setBit):
        (JSC::getResultProfileBytecodeOffset):
        * jit/JITArithmetic.cpp:
        (JSC::JIT::emit_op_div):
        (JSC::JIT::emit_op_mul):
        * jit/JITDivGenerator.cpp:
        (JSC::JITDivGenerator::generateFastPath):
        * jit/JITDivGenerator.h:
        (JSC::JITDivGenerator::JITDivGenerator):
        * jit/JITMulGenerator.cpp:
        (JSC::JITMulGenerator::generateFastPath):
        * jit/JITMulGenerator.h:
        (JSC::JITMulGenerator::JITMulGenerator):
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):

2015-12-18  Keith Miller  <keith_miller@apple.com>

        verboseDFGByteCodeParsing option should show the bytecode it is parsing.
        https://bugs.webkit.org/show_bug.cgi?id=152434

        Reviewed by Michael Saboff.

        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::parseBlock):

2015-12-18  Csaba Osztrogonác  <ossy@webkit.org>

        [ARM] Add the missing setupArgumentsWithExecState functions after r193974
        https://bugs.webkit.org/show_bug.cgi?id=152214

        Reviewed by Mark Lam.

        Relanding r194007 after r194248.

        * jit/CCallHelpers.h:
        (JSC::CCallHelpers::setupArgumentsWithExecState):

2015-12-17  Joseph Pecoraro  <pecoraro@apple.com>

        Web Inspector: Remove "local" scope type from the protocol
        https://bugs.webkit.org/show_bug.cgi?id=152409

        Reviewed by Timothy Hatcher.

        After r194251 the backend no longer sends this scope type.
        So remove it from the protocol.

        The concept of a Local Scope should be calculatable by the
        frontend. In fact the way the backend used to do this could
        easily be done by the frontend. To be done in a follow-up.

        * inspector/InjectedScriptSource.js:
        * inspector/JSJavaScriptCallFrame.h:
        * inspector/protocol/Debugger.json:

2015-12-17  Sukolsak Sakshuwong  <sukolsak@gmail.com>

        [INTL] Implement Collator Compare Functions
        https://bugs.webkit.org/show_bug.cgi?id=147604

        Reviewed by Darin Adler.

        This patch implements Intl.Collator.prototype.compare() according
        to the ECMAScript 2015 Internationalization API spec (ECMA-402 2nd edition.)

        * runtime/IntlCollator.cpp:
        (JSC::IntlCollator::~IntlCollator):
        (JSC::sortLocaleData):
        (JSC::searchLocaleData):
        (JSC::IntlCollator::initializeCollator):
        (JSC::IntlCollator::createCollator):
        (JSC::IntlCollator::compareStrings):
        (JSC::IntlCollator::usageString):
        (JSC::IntlCollator::sensitivityString):
        (JSC::IntlCollator::resolvedOptions):
        (JSC::IntlCollator::setBoundCompare):
        (JSC::IntlCollatorFuncCompare): Deleted.
        * runtime/IntlCollator.h:
        (JSC::IntlCollator::usage): Deleted.
        (JSC::IntlCollator::setUsage): Deleted.
        (JSC::IntlCollator::locale): Deleted.
        (JSC::IntlCollator::setLocale): Deleted.
        (JSC::IntlCollator::collation): Deleted.
        (JSC::IntlCollator::setCollation): Deleted.
        (JSC::IntlCollator::numeric): Deleted.
        (JSC::IntlCollator::setNumeric): Deleted.
        (JSC::IntlCollator::sensitivity): Deleted.
        (JSC::IntlCollator::setSensitivity): Deleted.
        (JSC::IntlCollator::ignorePunctuation): Deleted.
        (JSC::IntlCollator::setIgnorePunctuation): Deleted.
        * runtime/IntlCollatorConstructor.cpp:
        (JSC::constructIntlCollator):
        (JSC::callIntlCollator):
        (JSC::sortLocaleData): Deleted.
        (JSC::searchLocaleData): Deleted.
        (JSC::initializeCollator): Deleted.
        * runtime/IntlCollatorPrototype.cpp:
        (JSC::IntlCollatorFuncCompare):
        (JSC::IntlCollatorPrototypeFuncResolvedOptions):
        * runtime/IntlObject.cpp:
        (JSC::defaultLocale):
        (JSC::convertICULocaleToBCP47LanguageTag):
        (JSC::intlStringOption):
        (JSC::resolveLocale):
        (JSC::supportedLocales):
        * runtime/IntlObject.h:
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::intlCollatorAvailableLocales):
        (JSC::JSGlobalObject::intlDateTimeFormatAvailableLocales):
        (JSC::JSGlobalObject::intlNumberFormatAvailableLocales):

2015-12-17  Joseph Pecoraro  <pecoraro@apple.com>

        Provide a way to distinguish a nested lexical block from a function's lexical block
        https://bugs.webkit.org/show_bug.cgi?id=152361

        Reviewed by Saam Barati.

        * bytecompiler/BytecodeGenerator.h:
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::initializeDefaultParameterValuesAndSetupFunctionScopeStack):
        (JSC::BytecodeGenerator::initializeArrowFunctionContextScopeIfNeeded):
        (JSC::BytecodeGenerator::emitPushFunctionNameScope):
        (JSC::BytecodeGenerator::emitPushCatchScope):
        Each of these are specialized scopes. They are not nested lexical scopes.
        
        (JSC::BytecodeGenerator::pushLexicalScope):
        (JSC::BytecodeGenerator::pushLexicalScopeInternal):
        Include an extra parameter to mark the SymbolTable as a nested lexical or not.

        * bytecompiler/NodesCodegen.cpp:
        (JSC::BlockNode::emitBytecode):
        (JSC::ForNode::emitBytecode):
        (JSC::ForInNode::emitMultiLoopBytecode):
        (JSC::ForOfNode::emitBytecode):
        (JSC::SwitchNode::emitBytecode):
        (JSC::ClassExprNode::emitBytecode):
        Each of these are cases of non-function nested lexical scopes.
        So mark the SymbolTable as nested.

        * inspector/protocol/Debugger.json:
        * inspector/InjectedScriptSource.js:
        Include a new scope type.

        * inspector/JSJavaScriptCallFrame.h:
        * inspector/JSJavaScriptCallFrame.cpp:
        (Inspector::JSJavaScriptCallFrame::scopeType):
        Use the new "NestedLexical" scope type for nested, non-function,
        lexical scopes. The Inspector can use this to better describe
        this scope in the frontend.

        * debugger/DebuggerScope.cpp:
        (JSC::DebuggerScope::isNestedLexicalScope):
        * debugger/DebuggerScope.h:
        * runtime/JSScope.cpp:
        (JSC::JSScope::isNestedLexicalScope):
        * runtime/JSScope.h:
        * runtime/SymbolTable.cpp:
        (JSC::SymbolTable::SymbolTable):
        (JSC::SymbolTable::cloneScopePart):
        * runtime/SymbolTable.h:
        Access the isNestedLexicalScope bit.

2015-12-17  Joseph Pecoraro  <pecoraro@apple.com>

        Unreviewed EFL Build Fix after r194247.

        * interpreter/CallFrame.cpp:
        (JSC::CallFrame::friendlyFunctionName):
        Handle compilers that don't realize the switch handles all cases.

2015-12-17  Keith Miller  <keith_miller@apple.com>

        [ES6] Add support for Symbol.hasInstance
        https://bugs.webkit.org/show_bug.cgi?id=151839

        Reviewed by Saam Barati.

        Fixed version of r193986, r193983, and r193974.

        This patch adds support for Symbol.hasInstance, unfortunately in order to prevent
        regressions several new bytecodes and DFG IR nodes were necessary. Before, Symbol.hasInstance
        when executing an instanceof expression we would emit three bytecodes: overrides_has_instance, get_by_id,
        then instanceof. As the spec has changed, we emit a more complicated set of bytecodes in addition to some
        new ones. First the role of overrides_has_instance and its corresponding DFG node have changed. Now it returns
        a js-boolean indicating whether the RHS of the instanceof expression (from here on called the constructor for simplicity)
        needs non-default behavior for resolving the expression. i.e. The constructor has a Symbol.hasInstance that differs from the one on
        Function.prototype[Symbol.hasInstance] or is a bound/C-API function. Once we get to the DFG this node is generally eliminated as
        we can prove the value of Symbol.hasInstance is a constant. The second new bytecode is instanceof_custom. insntanceof_custom, just
        emits a call to slow path code that computes the result.

        In the DFG, there is also a new node, CheckTypeInfoFlags, which checks the type info flags are consistent with the ones provided and
        OSR exits if the flags are not. Additionally, we attempt to prove that the result of CheckHasValue will be a constant and transform
        it into a CheckTypeInfoFlags followed by a JSConstant.

        * API/JSCallbackObject.h:
        * builtins/FunctionPrototype.js:
        (symbolHasInstance):
        * bytecode/BytecodeBasicBlock.cpp:
        (JSC::isBranch): Deleted.
        * bytecode/BytecodeList.json:
        * bytecode/BytecodeUseDef.h:
        (JSC::computeUsesForBytecodeOffset):
        (JSC::computeDefsForBytecodeOffset):
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::dumpBytecode):
        * bytecode/ExitKind.cpp:
        (JSC::exitKindToString):
        * bytecode/ExitKind.h:
        * bytecode/PreciseJumpTargets.cpp:
        (JSC::getJumpTargetsForBytecodeOffset): Deleted.
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitOverridesHasInstance):
        (JSC::BytecodeGenerator::emitInstanceOfCustom):
        (JSC::BytecodeGenerator::emitCheckHasInstance): Deleted.
        * bytecompiler/BytecodeGenerator.h:
        * bytecompiler/NodesCodegen.cpp:
        (JSC::InstanceOfNode::emitBytecode):
        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::parseBlock):
        * dfg/DFGCapabilities.cpp:
        (JSC::DFG::capabilityLevel):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGDoesGC.cpp:
        (JSC::DFG::doesGC):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGHeapLocation.cpp:
        (WTF::printInternal):
        * dfg/DFGHeapLocation.h:
        * dfg/DFGNode.h:
        (JSC::DFG::Node::hasCellOperand):
        (JSC::DFG::Node::hasTypeInfoOperand):
        (JSC::DFG::Node::typeInfoOperand):
        * dfg/DFGNodeType.h:
        * dfg/DFGPredictionPropagationPhase.cpp:
        (JSC::DFG::PredictionPropagationPhase::propagate):
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileCheckTypeInfoFlags):
        (JSC::DFG::SpeculativeJIT::compileInstanceOfCustom):
        * dfg/DFGSpeculativeJIT.h:
        (JSC::DFG::SpeculativeJIT::callOperation):
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLIntrinsicRepository.h:
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNode):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileOverridesHasInstance):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCheckTypeInfoFlags):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileInstanceOfCustom):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCheckHasInstance): Deleted.
        * jit/JIT.cpp:
        (JSC::JIT::privateCompileMainPass):
        (JSC::JIT::privateCompileSlowCases):
        * jit/JIT.h:
        * jit/JITInlines.h:
        (JSC::JIT::callOperation):
        * jit/JITOpcodes.cpp:
        (JSC::JIT::emit_op_overrides_has_instance):
        (JSC::JIT::emit_op_instanceof):
        (JSC::JIT::emit_op_instanceof_custom):
        (JSC::JIT::emitSlow_op_instanceof):
        (JSC::JIT::emitSlow_op_instanceof_custom):
        (JSC::JIT::emit_op_check_has_instance): Deleted.
        (JSC::JIT::emitSlow_op_check_has_instance): Deleted.
        * jit/JITOpcodes32_64.cpp:
        (JSC::JIT::emit_op_overrides_has_instance):
        (JSC::JIT::emit_op_instanceof):
        (JSC::JIT::emit_op_instanceof_custom):
        (JSC::JIT::emitSlow_op_instanceof_custom):
        (JSC::JIT::emit_op_check_has_instance): Deleted.
        (JSC::JIT::emitSlow_op_check_has_instance): Deleted.
        * jit/JITOperations.cpp:
        * jit/JITOperations.h:
        * llint/LLIntData.cpp:
        (JSC::LLInt::Data::performAssertions):
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
        * llint/LLIntSlowPaths.h:
        * llint/LowLevelInterpreter32_64.asm:
        * llint/LowLevelInterpreter64.asm:
        * runtime/CommonIdentifiers.h:
        * runtime/ExceptionHelpers.cpp:
        (JSC::invalidParameterInstanceofSourceAppender):
        (JSC::invalidParameterInstanceofNotFunctionSourceAppender):
        (JSC::invalidParameterInstanceofhasInstanceValueNotFunctionSourceAppender):
        (JSC::createInvalidInstanceofParameterErrorNotFunction):
        (JSC::createInvalidInstanceofParameterErrorhasInstanceValueNotFunction):
        (JSC::createInvalidInstanceofParameterError): Deleted.
        * runtime/ExceptionHelpers.h:
        * runtime/FunctionPrototype.cpp:
        (JSC::FunctionPrototype::addFunctionProperties):
        * runtime/FunctionPrototype.h:
        * runtime/JSBoundFunction.cpp:
        (JSC::isBoundFunction):
        (JSC::hasInstanceBoundFunction):
        * runtime/JSBoundFunction.h:
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        (JSC::JSGlobalObject::visitChildren):
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::functionProtoHasInstanceSymbolFunction):
        * runtime/JSObject.cpp:
        (JSC::JSObject::hasInstance):
        (JSC::objectPrivateFuncInstanceOf):
        * runtime/JSObject.h:
        * runtime/JSTypeInfo.h:
        (JSC::TypeInfo::TypeInfo):
        (JSC::TypeInfo::overridesHasInstance):
        * runtime/WriteBarrier.h:
        (JSC::WriteBarrierBase<Unknown>::slot):
        * tests/es6.yaml:
        * tests/stress/instanceof-custom-hasinstancesymbol.js: Added.
        (Constructor):
        (value):
        (instanceOf):
        (body):
        * tests/stress/symbol-hasInstance.js: Added.
        (Constructor):
        (value):
        (ObjectClass.Symbol.hasInstance):
        (NumberClass.Symbol.hasInstance):

2015-12-17  Joseph Pecoraro  <pecoraro@apple.com>

        Web Inspector: Improve names in Debugger Call Stack section when paused
        https://bugs.webkit.org/show_bug.cgi?id=152398

        Reviewed by Brian Burg.

        * debugger/DebuggerCallFrame.cpp:
        (JSC::DebuggerCallFrame::functionName):
        Provide a better name from the underlying CallFrame.

        * inspector/InjectedScriptSource.js:
        (InjectedScript.CallFrameProxy):
        Just call functionName, it will provide a better
        than nothing function name.

        * runtime/JSFunction.cpp:
        (JSC::getCalculatedDisplayName):
        Use emptyString().

        * interpreter/CallFrame.h:
        * interpreter/CallFrame.cpp:
        (JSC::CallFrame::friendlyFunctionName):
        This is the third similiar implementation of this,
        but all other cases use other "StackFrame" objects.
        Use the expected names for program code.

2015-12-16  Joseph Pecoraro  <pecoraro@apple.com>

        Web Inspector: Add JSContext Script Profiling
        https://bugs.webkit.org/show_bug.cgi?id=151899

        Reviewed by Brian Burg.

        Extend JSC::Debugger to include a profiling client interface
        that the Inspector can implement to be told about script execution
        entry and exit points. Add new profiledCall/Evaluate/Construct
        methods that are entry points that will notify the profiling
        client if it exists.

        By putting the profiling client on Debugger it avoids having
        special code paths for a JSGlobalObject being JSContext inspected
        or a JSGlobalObject in a Page being Web inspected. In either case
        the JSGlobalObject can go through its debugger() which always
        reaches the correct inspector instance.

        * CMakeLists.txt:
        * DerivedSources.make:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        Handle new files.

        * runtime/CallData.cpp:
        (JSC::profiledCall):
        * runtime/CallData.h:
        * runtime/Completion.cpp:
        (JSC::profiledEvaluate):
        * runtime/Completion.h:
        (JSC::profiledEvaluate):
        * runtime/ConstructData.cpp:
        (JSC::profiledConstruct):
        * runtime/ConstructData.h:
        (JSC::profiledConstruct):
        Create profiled versions of interpreter entry points. If a profiler client is
        available, this will automatically inform it of entry/exit. Include a reason
        why this is being profiled. Currently all reasons in JavaScriptCore are enumerated
        (API, Microtask) and Other is to be used by WebCore or future clients.

        * debugger/ScriptProfilingScope.h: Added.
        (JSC::ScriptProfilingScope::ScriptProfilingScope):
        (JSC::ScriptProfilingScope::~ScriptProfilingScope):
        (JSC::ScriptProfilingScope::shouldStartProfile):
        (JSC::ScriptProfilingScope::shouldEndProfile):
        At profiled entry points inform the profiling client if needed.

        * API/JSBase.cpp:
        (JSEvaluateScript):
        * API/JSObjectRef.cpp:
        (JSObjectCallAsFunction):
        (JSObjectCallAsConstructor):
        * runtime/JSJob.cpp:
        (JSC::JSJobMicrotask::run):
        Use the profiled functions for API and Microtask execution entry points.

        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::hasProfiler):
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::hasProfiler):
        Extend hasProfiler to also check the new Debugger script profiler.

        * debugger/Debugger.cpp:
        (JSC::Debugger::setProfilingClient):
        (JSC::Debugger::willEvaluateScript):
        (JSC::Debugger::didEvaluateScript):
        * debugger/Debugger.h:
        Pass through to the profiling client.

        * inspector/protocol/ScriptProfiler.json: Added.
        * inspector/agents/InspectorScriptProfilerAgent.cpp: Added.
        (Inspector::InspectorScriptProfilerAgent::InspectorScriptProfilerAgent):
        (Inspector::InspectorScriptProfilerAgent::~InspectorScriptProfilerAgent):
        (Inspector::InspectorScriptProfilerAgent::didCreateFrontendAndBackend):
        (Inspector::InspectorScriptProfilerAgent::willDestroyFrontendAndBackend):
        (Inspector::InspectorScriptProfilerAgent::startTracking):
        (Inspector::InspectorScriptProfilerAgent::stopTracking):
        (Inspector::InspectorScriptProfilerAgent::isAlreadyProfiling):
        (Inspector::InspectorScriptProfilerAgent::willEvaluateScript):
        (Inspector::InspectorScriptProfilerAgent::didEvaluateScript):
        (Inspector::toProtocol):
        (Inspector::InspectorScriptProfilerAgent::addEvent):
        (Inspector::buildAggregateCallInfoInspectorObject):
        (Inspector::buildInspectorObject):
        (Inspector::buildProfileInspectorObject):
        (Inspector::InspectorScriptProfilerAgent::trackingComplete):
        * inspector/agents/InspectorScriptProfilerAgent.h: Added.
        New ScriptProfiler domain to just turn on / off script profiling.
        It introduces a start/update/complete event model which we want
        to include in new domains.

        * inspector/InspectorEnvironment.h:
        * inspector/InjectedScriptBase.cpp:
        (Inspector::InjectedScriptBase::callFunctionWithEvalEnabled):
        Simplify this now that we want it to be the same for all clients.

        * inspector/JSGlobalObjectInspectorController.h:
        * inspector/JSGlobalObjectInspectorController.cpp:
        (Inspector::JSGlobalObjectInspectorController::JSGlobalObjectInspectorController):
        Create the new agent.

        * inspector/InspectorProtocolTypes.h:
        (Inspector::Protocol::Array::addItem):
        Allow pushing a double onto a Protocol::Array.

2015-12-17  Yusuke Suzuki  <utatane.tea@gmail.com>

        [ES6] Handle new_generator_func / new_generator_func_exp in DFG / FTL
        https://bugs.webkit.org/show_bug.cgi?id=152227

        Reviewed by Saam Barati.

        This patch introduces new_generator_func / new_generator_func_exp into DFG and FTL.
        We add a new DFG Node, NewGeneratorFunction. It will construct a function with GeneratorFunction's structure.
        The structure of GeneratorFunction is different from one of Function because GeneratorFunction has the different __proto__.

        Instead of extending NewFunction / PhantomNewFunction, we just added new DFG nodes, NewGeneratorFunction and PhantomNewGeneratorFunction.
        This is because NewGeneratorFunction will generate an object that has different class info from JSFunction (And if JSGeneratorFunction is extended, its size will become different from JSFunction).
        So, rather than extending NewFunction with generator flag, just adding new DFG nodes seems cleaner.

        Object allocation sinking phase will change NewGeneratorFunction to PhantomNewGeneratorFunction and defer or eliminate its actual materialization.
        It is completely the same to NewFunction and PhantomNewFunction.
        And when OSR exit occurs, we need to execute deferred NewGeneratorFunction since Baseline JIT does not consider it.
        So in FTL operation, we should create JSGeneratorFunction if we see PhantomNewGeneratorFunction materialization.

        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::parseBlock):
        * dfg/DFGCapabilities.cpp:
        (JSC::DFG::capabilityLevel):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGClobbersExitState.cpp:
        (JSC::DFG::clobbersExitState):
        * dfg/DFGDoesGC.cpp:
        (JSC::DFG::doesGC):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGMayExit.cpp:
        (JSC::DFG::mayExit):
        * dfg/DFGNode.h:
        (JSC::DFG::Node::convertToPhantomNewFunction):
        (JSC::DFG::Node::convertToPhantomNewGeneratorFunction):
        (JSC::DFG::Node::hasCellOperand):
        (JSC::DFG::Node::isFunctionAllocation):
        (JSC::DFG::Node::isPhantomFunctionAllocation):
        (JSC::DFG::Node::isPhantomAllocation):
        * dfg/DFGNodeType.h:
        * dfg/DFGObjectAllocationSinkingPhase.cpp:
        * dfg/DFGPredictionPropagationPhase.cpp:
        (JSC::DFG::PredictionPropagationPhase::propagate):
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileNewFunction):
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGStoreBarrierInsertionPhase.cpp:
        * dfg/DFGStructureRegistrationPhase.cpp:
        (JSC::DFG::StructureRegistrationPhase::run):
        * dfg/DFGValidate.cpp:
        (JSC::DFG::Validate::validateCPS):
        (JSC::DFG::Validate::validateSSA):
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNode):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNewFunction):
        * ftl/FTLOperations.cpp:
        (JSC::FTL::operationPopulateObjectInOSR):
        (JSC::FTL::operationMaterializeObjectInOSR):
        * tests/stress/generator-function-create-optimized.js: Added.
        (shouldBe):
        (g):
        (test.return.gen):
        (test):
        (test2.gen):
        (test2):
        * tests/stress/generator-function-declaration-sinking-no-double-allocate.js: Added.
        (shouldBe):
        (GeneratorFunctionPrototype):
        (call):
        (f):
        (sink):
        * tests/stress/generator-function-declaration-sinking-osrexit.js: Added.
        (shouldBe):
        (GeneratorFunctionPrototype):
        (g):
        (f):
        (sink):
        * tests/stress/generator-function-declaration-sinking-put.js: Added.
        (shouldBe):
        (GeneratorFunctionPrototype):
        (g):
        (f):
        (sink):
        * tests/stress/generator-function-expression-sinking-no-double-allocate.js: Added.
        (shouldBe):
        (GeneratorFunctionPrototype):
        (call):
        (f):
        (sink):
        * tests/stress/generator-function-expression-sinking-osrexit.js: Added.
        (shouldBe):
        (GeneratorFunctionPrototype):
        (g):
        (sink):
        * tests/stress/generator-function-expression-sinking-put.js: Added.
        (shouldBe):
        (GeneratorFunctionPrototype):
        (g):
        (sink):

2015-12-16  Michael Saboff  <msaboff@apple.com>

        ARM64 MacroAssembler improperly reuses data temp register in test32() and test8() calls
        https://bugs.webkit.org/show_bug.cgi?id=152370

        Reviewed by Benjamin Poulain.

        Changed the test8/32(Address, Register) flavors to use the memoryTempRegister for loading the value
        att Address so that it doesn't collide with the subsequent use of dataTempRegister by the
        test32(Register, Register) function.

        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::test32):
        (JSC::MacroAssemblerARM64::test8):

2015-12-16  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should support switches
        https://bugs.webkit.org/show_bug.cgi?id=152360

        Reviewed by Geoffrey Garen.

        I implemented this because I was hoping it would less us run V8/crypto, but instead it just led
        me to file a fun bug: https://bugs.webkit.org/show_bug.cgi?id=152365.

        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::check):
        (JSC::FTL::Output::switchInstruction):
        (JSC::FTL::Output::ret):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::ftlUnreachable):
        (JSC::FTL::DFG::LowerDFGToLLVM::crash):

2015-12-16  Alex Christensen  <achristensen@webkit.org>

        Fix internal Windows build
        https://bugs.webkit.org/show_bug.cgi?id=152364

        Reviewed by Tim Horton.

        * JavaScriptCore.vcxproj/JavaScriptCore.proj:

2015-12-16  Filip Pizlo  <fpizlo@apple.com>

        Improve JSObject::put performance
        https://bugs.webkit.org/show_bug.cgi?id=152347

        Reviewed by Geoffrey Garen.

        This adds a new benchmark called dynbench, which just uses the C++ API to create, modify, and
        query objects. This also adds some optimizations to make the JSObject::put code faster by making
        it inlinable in places that really need the performance, like JITOperations and LLIntSlowPaths.
        Inlining it is optional because the put() method is large. If you want it inlined, call
        putInline(). There's a putInline() variant of both JSObject::put() and JSValue::put().

        This is up to a 20% improvement for JSObject::put calls that get inlined all the way (like from
        JITOperations and the new benchmark) and it's also a speed-up, albeit a smaller one, for
        JSObject::put calls that don't get inlined (i.e. those from the DOM and the JSC C++ library code).
        Specific speed-ups are as follows. Note that "dynamic context" means that we told PutPropertySlot
        that we're not a static put_by_id, which turns off some type inference.

        Get By Id: 2% faster
        Put By Id Replace: 23% faster
        Put By Id Transition + object allocation: 11% faster
        Get By Id w/ dynamic context: 5% faster
        Put By Id Replace w/ dynamic context: 25% faster
        Put By Id Transition + object allocation w/ dynamic context: 10% faster

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * dynbench.cpp: Added.
        (JSC::benchmarkImpl):
        (main):
        * jit/CallFrameShuffler32_64.cpp:
        * jit/CallFrameShuffler64.cpp:
        * jit/JITOperations.cpp:
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
        * runtime/ClassInfo.h:
        (JSC::ClassInfo::hasStaticProperties):
        * runtime/ConsoleClient.cpp:
        * runtime/CustomGetterSetter.h:
        * runtime/ErrorInstance.cpp:
        (JSC::ErrorInstance::finishCreation):
        (JSC::addErrorInfoAndGetBytecodeOffset): Deleted.
        * runtime/GetterSetter.h:
        (JSC::asGetterSetter):
        * runtime/JSCInlines.h:
        * runtime/JSCJSValue.h:
        * runtime/JSCJSValueInlines.h:
        (JSC::JSValue::put):
        (JSC::JSValue::putInternal):
        (JSC::JSValue::putByIndex):
        * runtime/JSObject.cpp:
        (JSC::JSObject::put):
        (JSC::JSObject::putByIndex):
        * runtime/JSObject.h:
        (JSC::JSObject::getVectorLength):
        (JSC::JSObject::inlineGetOwnPropertySlot):
        (JSC::JSObject::get):
        (JSC::JSObject::putDirectInternal):

2015-12-16  Filip Pizlo  <fpizlo@apple.com>

        Work around a bug in LLVM by flipping the unification order
        https://bugs.webkit.org/show_bug.cgi?id=152341
        rdar://problem/23920749

        Reviewed by Mark Lam.

        * dfg/DFGUnificationPhase.cpp:
        (JSC::DFG::UnificationPhase::run):

2015-12-16  Saam barati  <sbarati@apple.com>

        Add "explicit operator bool" to ScratchRegisterAllocator::PreservedState
        https://bugs.webkit.org/show_bug.cgi?id=152337

        Reviewed by Mark Lam.

        If we have a default constructor, we should also have a way
        to tell if a PreservedState is invalid.

        * jit/ScratchRegisterAllocator.cpp:
        (JSC::ScratchRegisterAllocator::preserveReusedRegistersByPushing):
        (JSC::ScratchRegisterAllocator::restoreReusedRegistersByPopping):
        * jit/ScratchRegisterAllocator.h:
        (JSC::ScratchRegisterAllocator::PreservedState::PreservedState):
        (JSC::ScratchRegisterAllocator::PreservedState::operator bool):

2015-12-16  Caitlin Potter  <caitp@igalia.com>

        [JSC] fix error message for eval/arguments CoverInitializedName in strict code
        https://bugs.webkit.org/show_bug.cgi?id=152304

        Reviewed by Darin Adler.

        Because the error was originally classified as indicating a Pattern, the
        error in AssignmentPattern parsing causes the reported message to revert to
        the original Expression error message, which in this case is incorrect.

        This change modifies the implementation of the strict code
        error slightly, and reclassifies the error to prevent the message revert,
        which improves the clarity of the message overall.

        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseAssignmentElement):
        (JSC::Parser<LexerType>::parseDestructuringPattern):
        * parser/Parser.h:
        (JSC::Parser::ExpressionErrorClassifier::reclassifyExpressionError):
        (JSC::Parser::reclassifyExpressionError):
        * tests/stress/destructuring-assignment-syntax.js:

2015-12-16  Joseph Pecoraro  <pecoraro@apple.com>

        Builtin source should be minified more
        https://bugs.webkit.org/show_bug.cgi?id=152290

        Reviewed by Darin Adler.

        * Scripts/builtins/builtins_model.py:
        (BuiltinFunction.fromString):
        Remove primarily empty lines that would just introduce clutter.
        We only do the minification in non-Debug configurations, which
        is determined by the CONFIGURATION environment variable. You can
        see how tests would generate differently, like so:
        shell> CONFIGURATION=Release ./Tools/Scripts/run-builtins-generator-tests

2015-12-16  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r194135.
        https://bugs.webkit.org/show_bug.cgi?id=152333

        due to missing OSR exit materialization support in FTL
        (Requested by yusukesuzuki on #webkit).

        Reverted changeset:

        "[ES6] Handle new_generator_func / new_generator_func_exp in
        DFG / FTL"
        https://bugs.webkit.org/show_bug.cgi?id=152227
        http://trac.webkit.org/changeset/194135

2015-12-16  Youenn Fablet  <youenn.fablet@crf.canon.fr>

        [Fetch API] Add fetch API compile time flag
        https://bugs.webkit.org/show_bug.cgi?id=152254

        Reviewed by Darin Adler.

        * Configurations/FeatureDefines.xcconfig:

2015-12-16  Yusuke Suzuki  <utatane.tea@gmail.com>

        [ES6] Handle new_generator_func / new_generator_func_exp in DFG / FTL
        https://bugs.webkit.org/show_bug.cgi?id=152227

        Reviewed by Saam Barati.

        This patch introduces new_generator_func / new_generator_func_exp into DFG and FTL.
        We add a new DFG Node, NewGeneratorFunction. It will construct a function with GeneratorFunction's structure.
        The structure of GeneratorFunction is different from one of Function because GeneratorFunction has the different __proto__.

        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::parseBlock):
        * dfg/DFGCapabilities.cpp:
        (JSC::DFG::capabilityLevel):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGClobbersExitState.cpp:
        (JSC::DFG::clobbersExitState):
        * dfg/DFGDoesGC.cpp:
        (JSC::DFG::doesGC):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGMayExit.cpp:
        (JSC::DFG::mayExit):
        * dfg/DFGNode.h:
        (JSC::DFG::Node::convertToPhantomNewFunction):
        (JSC::DFG::Node::hasCellOperand):
        (JSC::DFG::Node::isFunctionAllocation):
        * dfg/DFGNodeType.h:
        * dfg/DFGObjectAllocationSinkingPhase.cpp:
        * dfg/DFGPredictionPropagationPhase.cpp:
        (JSC::DFG::PredictionPropagationPhase::propagate):
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileNewFunction):
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGStoreBarrierInsertionPhase.cpp:
        * dfg/DFGStructureRegistrationPhase.cpp:
        (JSC::DFG::StructureRegistrationPhase::run):
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNode):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNewFunction):
        * tests/stress/generator-function-create-optimized.js: Added.
        (shouldBe):
        (g):
        (test.return.gen):
        (test):
        (test2.gen):
        (test2):
        * tests/stress/generator-function-declaration-sinking-no-double-allocate.js: Added.
        (shouldBe):
        (GeneratorFunctionPrototype):
        (call):
        (f):
        (sink):
        * tests/stress/generator-function-declaration-sinking-osrexit.js: Added.
        (shouldBe):
        (GeneratorFunctionPrototype):
        (g):
        (f):
        (sink):
        * tests/stress/generator-function-declaration-sinking-put.js: Added.
        (shouldBe):
        (GeneratorFunctionPrototype):
        (g):
        (f):
        (sink):
        * tests/stress/generator-function-expression-sinking-no-double-allocate.js: Added.
        (shouldBe):
        (GeneratorFunctionPrototype):
        (call):
        (f):
        (sink):
        * tests/stress/generator-function-expression-sinking-osrexit.js: Added.
        (shouldBe):
        (GeneratorFunctionPrototype):
        (g):
        (sink):
        * tests/stress/generator-function-expression-sinking-put.js: Added.
        (shouldBe):
        (GeneratorFunctionPrototype):
        (g):
        (sink):

2015-12-15  Mark Lam  <mark.lam@apple.com>

        Gardening: fix broken 32-bit JSC tests.  Just need to assign a scratch register.
        https://bugs.webkit.org/show_bug.cgi?id=152191 

        Not reviewed.

        * jit/JITArithmetic.cpp:
        (JSC::JIT::emitBitBinaryOpFastPath):

2015-12-15  Mark Lam  <mark.lam@apple.com>

        Introducing ScratchRegisterAllocator::PreservedState.
        https://bugs.webkit.org/show_bug.cgi?id=152315

        Reviewed by Geoffrey Garen.

        restoreReusedRegistersByPopping() should always be called with 2 values that
        matches the expectation of preserveReusedRegistersByPushing().  Those 2 values
        are the number of bytes preserved and the ExtraStackSpace requirement.  By
        encapsulating them in a ScratchRegisterAllocator::PreservedState, we can make
        it less error prone when calling restoreReusedRegistersByPopping().  Now, we only
        need to pass it the appropriate PreservedState that its matching
        preserveReusedRegistersByPushing() returned.

        * bytecode/PolymorphicAccess.cpp:
        (JSC::AccessGenerationState::restoreScratch):
        (JSC::AccessCase::generate):
        (JSC::PolymorphicAccess::regenerate):
        * bytecode/PolymorphicAccess.h:
        (JSC::AccessGenerationState::AccessGenerationState):
        * ftl/FTLCompileBinaryOp.cpp:
        (JSC::FTL::generateBinaryBitOpFastPath):
        (JSC::FTL::generateRightShiftFastPath):
        (JSC::FTL::generateBinaryArithOpFastPath):
        * ftl/FTLLazySlowPath.cpp:
        (JSC::FTL::LazySlowPath::generate):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::emitStoreBarrier):
        * jit/ScratchRegisterAllocator.cpp:
        (JSC::ScratchRegisterAllocator::allocateScratchGPR):
        (JSC::ScratchRegisterAllocator::allocateScratchFPR):
        (JSC::ScratchRegisterAllocator::preserveReusedRegistersByPushing):
        (JSC::ScratchRegisterAllocator::restoreReusedRegistersByPopping):
        * jit/ScratchRegisterAllocator.h:
        (JSC::ScratchRegisterAllocator::usedRegisters):
        (JSC::ScratchRegisterAllocator::PreservedState::PreservedState):

2015-12-15  Mark Lam  <mark.lam@apple.com>

        Polymorphic operand types for DFG and FTL bit operators.
        https://bugs.webkit.org/show_bug.cgi?id=152191

        Reviewed by Saam Barati.

        * bytecode/SpeculatedType.h:
        (JSC::isUntypedSpeculationForBitOps):
        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGNode.h:
        (JSC::DFG::Node::shouldSpeculateUntypedForBitOps):
        - Added check for types not supported by ValueToInt32, and therefore should be
          treated as untyped for bitops.

        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        - Handled untyped operands.

        * dfg/DFGOperations.cpp:
        * dfg/DFGOperations.h:
        - Added DFG slow path functions for bitops.

        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::emitUntypedBitOp):
        (JSC::DFG::SpeculativeJIT::compileBitwiseOp):
        (JSC::DFG::SpeculativeJIT::emitUntypedRightShiftBitOp):
        (JSC::DFG::SpeculativeJIT::compileShiftOp):
        * dfg/DFGSpeculativeJIT.h:
        - Added DFG backend support untyped operands for bitops.

        * dfg/DFGStrengthReductionPhase.cpp:
        (JSC::DFG::StrengthReductionPhase::handleNode):
        - Limit bitops strength reduction only to when we don't have untyped operands.
          This is because values that are not int32s need to be converted to int32.
          Without untyped operands, the ValueToInt32 node takes care of this.
          With untyped operands, we cannot use ValueToInt32, and need to do the conversion
          in the code emitted for the bitop node itself.  For example:

              5.5 | 0; // yields 5 because ValueToInt32 converts the 5.5 to a 5.
              "abc" | 0; // would yield "abc" instead of the expected 0 if we let
                         // strength reduction do its thing.

        * ftl/FTLCompileBinaryOp.cpp:
        (JSC::FTL::generateBinaryBitOpFastPath):
        (JSC::FTL::generateRightShiftFastPath):
        (JSC::FTL::generateBinaryOpFastPath):

        * ftl/FTLInlineCacheDescriptor.h:
        (JSC::FTL::BitAndDescriptor::BitAndDescriptor):
        (JSC::FTL::BitAndDescriptor::icSize):
        (JSC::FTL::BitAndDescriptor::nodeType):
        (JSC::FTL::BitAndDescriptor::opName):
        (JSC::FTL::BitAndDescriptor::slowPathFunction):
        (JSC::FTL::BitAndDescriptor::nonNumberSlowPathFunction):
        (JSC::FTL::BitOrDescriptor::BitOrDescriptor):
        (JSC::FTL::BitOrDescriptor::icSize):
        (JSC::FTL::BitOrDescriptor::nodeType):
        (JSC::FTL::BitOrDescriptor::opName):
        (JSC::FTL::BitOrDescriptor::slowPathFunction):
        (JSC::FTL::BitOrDescriptor::nonNumberSlowPathFunction):
        (JSC::FTL::BitXorDescriptor::BitXorDescriptor):
        (JSC::FTL::BitXorDescriptor::icSize):
        (JSC::FTL::BitXorDescriptor::nodeType):
        (JSC::FTL::BitXorDescriptor::opName):
        (JSC::FTL::BitXorDescriptor::slowPathFunction):
        (JSC::FTL::BitXorDescriptor::nonNumberSlowPathFunction):
        (JSC::FTL::BitLShiftDescriptor::BitLShiftDescriptor):
        (JSC::FTL::BitLShiftDescriptor::icSize):
        (JSC::FTL::BitLShiftDescriptor::nodeType):
        (JSC::FTL::BitLShiftDescriptor::opName):
        (JSC::FTL::BitLShiftDescriptor::slowPathFunction):
        (JSC::FTL::BitLShiftDescriptor::nonNumberSlowPathFunction):
        (JSC::FTL::BitRShiftDescriptor::BitRShiftDescriptor):
        (JSC::FTL::BitRShiftDescriptor::icSize):
        (JSC::FTL::BitRShiftDescriptor::nodeType):
        (JSC::FTL::BitRShiftDescriptor::opName):
        (JSC::FTL::BitRShiftDescriptor::slowPathFunction):
        (JSC::FTL::BitRShiftDescriptor::nonNumberSlowPathFunction):
        (JSC::FTL::BitURShiftDescriptor::BitURShiftDescriptor):
        (JSC::FTL::BitURShiftDescriptor::icSize):
        (JSC::FTL::BitURShiftDescriptor::nodeType):
        (JSC::FTL::BitURShiftDescriptor::opName):
        (JSC::FTL::BitURShiftDescriptor::slowPathFunction):
        (JSC::FTL::BitURShiftDescriptor::nonNumberSlowPathFunction):
        - Added support for bitop ICs.

        * ftl/FTLInlineCacheSize.cpp:
        (JSC::FTL::sizeOfBitAnd):
        (JSC::FTL::sizeOfBitOr):
        (JSC::FTL::sizeOfBitXor):
        (JSC::FTL::sizeOfBitLShift):
        (JSC::FTL::sizeOfBitRShift):
        (JSC::FTL::sizeOfBitURShift):
        * ftl/FTLInlineCacheSize.h:
        - Added new bitop IC sizes.  These are just estimates for now that work adequately,
          and are shown to not impact performance on benchmarks.  We will re-tune these
          sizes values later in another patch once all snippet ICs have been added.

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBitAnd):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBitOr):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBitXor):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBitRShift):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBitLShift):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBitURShift):
        - Added support for bitop ICs.

        * jit/JITLeftShiftGenerator.cpp:
        (JSC::JITLeftShiftGenerator::generateFastPath):
        * jit/JITLeftShiftGenerator.h:
        (JSC::JITLeftShiftGenerator::JITLeftShiftGenerator):
        * jit/JITRightShiftGenerator.cpp:
        (JSC::JITRightShiftGenerator::generateFastPath):
        - The shift MASM operatons need to ensure that the shiftAmount is not in the same
          register as the destination register.  With the baselineJIT and DFG, this is
          ensured in how we allocate these registers, and hence, the bug does not manifest.
          With the FTL, these registers are not guaranteed to be unique.  Hence, we need
          to fix the shift op snippet code to compensate for this. 

2015-12-15  Caitlin Potter  <caitp@igalia.com>

        [JSC] SyntaxError if AssignmentElement is `eval` or `arguments` in strict code
        https://bugs.webkit.org/show_bug.cgi?id=152302

        Reviewed by Mark Lam.

        `eval` and `arguments` must not be assigned to in strict code. This
        change fixes `language/expressions/assignment/destructuring/obj-id-simple-strict.js`
        in Test262, as well as a variety of other similar tests.

        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseAssignmentElement):
        (JSC::Parser<LexerType>::parseDestructuringPattern):
        * tests/stress/destructuring-assignment-syntax.js:

2015-12-15  Csaba Osztrogonác  <ossy@webkit.org>

        URTBF after 194062.

        * assembler/MacroAssemblerARM.h:
        (JSC::MacroAssemblerARM::supportsFloatingPointCeil): Added.
        (JSC::MacroAssemblerARM::ceilDouble): Added.

2015-12-14  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should account for localsOffset
        https://bugs.webkit.org/show_bug.cgi?id=152288

        Reviewed by Saam Barati.

        The DFG will build up some data structures that expect to know about offsets from FP. Those data
        structures may slide by some offset when the low-level compiler (either LLVM or B3) does stack
        allocation. So, the LLVM FTL modifies those data structures based on the real offset that it gets
        from LLVM's stackmaps. The B3 code needs to do the same.

        I had previously vowed to never put more stuff into FTLB3Compile.cpp, because I didn't want it to
        look like FTLCompile.cpp. Up until now, I was successful because I used lambdas installed by
        FTLLower. But in this case, I actually think that having code that just does this explicitly in
        FTLB3Compile.cpp is least confusing. There is no particular place in FTLLower that would want to
        care about this, and we need to ensure that we do this fixup before we run any of the stackmap
        generators. In other words, it needs to happen before we call B3::generate(). The ordering
        constraints seem like a good reason to have this done explicitly rather than through lambdas.

        I wrote a test. The test was failing in trunk because the B3 meaning of anchor().value() is
        different from the LLVM meaning. This caused breakage when we used this idiom:

            ValueFromBlock foo = m_out.anchor(things);
            ...(foo.value()) // we were expecting that foo.value() == things

        I never liked this idiom to begin with, so instead of trying to change B3's anchor(), I changed
        the idiom to:

            LValue fooValue = things;
            ValueFromBlock foo = m_out.anchor(fooValue);
            ...(fooValue)

        This is probably a good idea, since eventually we want B3's anchor() to just return the
        UpsilonValue*. To get there, we want to eliminate any situations where code assumes that
        ValueFromBlock is an actual object and not just a typedef for a pointer.

        * ftl/FTLB3Compile.cpp:
        (JSC::FTL::compile):
        * ftl/FTLB3Output.cpp:
        (JSC::FTL::Output::appendTo):
        (JSC::FTL::Output::lockedStackSlot):
        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::framePointer):
        (JSC::FTL::Output::constBool):
        (JSC::FTL::Output::constInt32):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::lower):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileGetIndexedPropertyStorage):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileGetByVal):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCreateDirectArguments):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileStringCharAt):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileForwardVarargs):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileHasIndexedProperty):
        (JSC::FTL::DFG::LowerDFGToLLVM::allocateJSArray):
        (JSC::FTL::DFG::LowerDFGToLLVM::sensibleDoubleToInt32):
        * ftl/FTLState.h:
        (JSC::FTL::verboseCompilationEnabled):
        * tests/stress/ftl-function-dot-arguments-with-callee-saves.js: Added.

2015-12-14  Yusuke Suzuki  <utatane.tea@gmail.com>

        Math.random should have an intrinsic thunk and it should be later handled as a DFG Node
        https://bugs.webkit.org/show_bug.cgi?id=152133

        Reviewed by Geoffrey Garen.

        In this patch, we implement new RandomIntrinsic. It emits a machine code to generate random numbers efficiently.
        And later it will be recognized by DFG and converted to ArithRandom node.
        It provides type information SpecDoubleReal since Math.random only generates a number within [0, 1.0).

        Currently, only 64bit version is supported. On 32bit environment, ArithRandom will be converted to callOperation.
        While it emits a function call, ArithRandom node on 32bit still represents SpecDoubleReal as a result type.

        * dfg/DFGAbstractHeap.h:
        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::handleIntrinsicCall):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGDoesGC.cpp:
        (JSC::DFG::doesGC):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGNodeType.h:
        * dfg/DFGOperations.cpp:
        * dfg/DFGOperations.h:
        * dfg/DFGPredictionPropagationPhase.cpp:
        (JSC::DFG::PredictionPropagationPhase::propagate):
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.h:
        (JSC::DFG::SpeculativeJIT::callOperation):
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        (JSC::DFG::SpeculativeJIT::compileArithRandom):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        (JSC::DFG::SpeculativeJIT::compileArithRandom):
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNode):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithRandom):
        * jit/AssemblyHelpers.cpp:
        (JSC::emitRandomThunkImpl):
        (JSC::AssemblyHelpers::emitRandomThunk):
        * jit/AssemblyHelpers.h:
        * jit/JITOperations.h:
        * jit/ThunkGenerators.cpp:
        (JSC::randomThunkGenerator):
        * jit/ThunkGenerators.h:
        * runtime/Intrinsic.h:
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::weakRandomOffset):
        * runtime/MathObject.cpp:
        (JSC::MathObject::finishCreation):
        * runtime/VM.cpp:
        (JSC::thunkGeneratorForIntrinsic):
        * tests/stress/random-53bit.js: Added.
        (test):
        * tests/stress/random-in-range.js: Added.
        (test):

2015-12-14  Benjamin Poulain  <benjamin@webkit.org>

        Rename FTL::Output's ceil64() to doubleCeil()

        Rubber-stamped by Filip Pizlo.

        ceil64() was a bad name, that's the name convention we use for integers.

        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::doubleCeil):
        (JSC::FTL::Output::ceil64): Deleted.
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithRound):

2015-12-14  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should be able to run n-body.js
        https://bugs.webkit.org/show_bug.cgi?id=152281

        Reviewed by Benjamin Poulain.

        Fix a bug where m_captured was pointing to the start of the captured vars slot rather than the
        end, like the rest of the FTL expected.

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::lower):

2015-12-14  Benjamin Poulain  <bpoulain@apple.com>

        Fix bad copy-paste in r194062

        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::ceil64):

2015-12-14  Filip Pizlo  <fpizlo@apple.com>

        Unreviewed, fix cloop build.

        * jit/GPRInfo.cpp:

2015-12-14  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should do PutById
        https://bugs.webkit.org/show_bug.cgi?id=152268

        Reviewed by Saam Barati.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::createGenericCompare): I realized that we were missing some useful matching rules.
        * b3/testb3.cpp: Added a bunch of tests.
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compilePutById): Do the things.
        * jit/GPRInfo.cpp: Added. I had to do this yucky thing because clang was having issues compiling references to this from deeply nested lambdas.
        * jit/GPRInfo.h: Added a comment about how patchpointScratchRegister is bizarre and should probably die.

2015-12-14  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Add ceil() support for x86 and expose it to B3
        https://bugs.webkit.org/show_bug.cgi?id=152231

        Reviewed by Geoffrey Garen.

        Most x86 CPUs we care about support ceil() natively
        with the round instruction.

        This patch expose that behind a runtime flag, use it
        in the Math.ceil() thunk and expose it to B3.

        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::supportsFloatingPointCeil):
        * assembler/MacroAssemblerARMv7.h:
        (JSC::MacroAssemblerARMv7::supportsFloatingPointCeil):
        * assembler/MacroAssemblerMIPS.h:
        (JSC::MacroAssemblerMIPS::supportsFloatingPointCeil):
        * assembler/MacroAssemblerSH4.h:
        (JSC::MacroAssemblerSH4::supportsFloatingPointCeil):
        * assembler/MacroAssemblerX86Common.cpp:
        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::ceilDouble):
        (JSC::MacroAssemblerX86Common::ceilFloat):
        (JSC::MacroAssemblerX86Common::supportsFloatingPointCeil):
        (JSC::MacroAssemblerX86Common::supportsLZCNT):
        * assembler/X86Assembler.h:
        (JSC::X86Assembler::roundss_rr):
        (JSC::X86Assembler::roundss_mr):
        (JSC::X86Assembler::roundsd_rr):
        (JSC::X86Assembler::roundsd_mr):
        (JSC::X86Assembler::mfence):
        (JSC::X86Assembler::X86InstructionFormatter::threeByteOp):
        * b3/B3ConstDoubleValue.cpp:
        (JSC::B3::ConstDoubleValue::ceilConstant):
        * b3/B3ConstDoubleValue.h:
        * b3/B3ConstFloatValue.cpp:
        (JSC::B3::ConstFloatValue::ceilConstant):
        * b3/B3ConstFloatValue.h:
        * b3/B3LowerMacrosAfterOptimizations.cpp:
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3Opcode.cpp:
        (WTF::printInternal):
        * b3/B3Opcode.h:
        * b3/B3ReduceDoubleToFloat.cpp:
        * b3/B3ReduceStrength.cpp:
        * b3/B3Validate.cpp:
        * b3/B3Value.cpp:
        (JSC::B3::Value::ceilConstant):
        (JSC::B3::Value::effects):
        (JSC::B3::Value::key):
        (JSC::B3::Value::typeFor):
        * b3/B3Value.h:
        * b3/air/AirOpcode.opcodes:
        * b3/testb3.cpp:
        (JSC::B3::testCeilArg):
        (JSC::B3::testCeilImm):
        (JSC::B3::testCeilMem):
        (JSC::B3::testCeilCeilArg):
        (JSC::B3::testCeilIToD64):
        (JSC::B3::testCeilIToD32):
        (JSC::B3::testCeilArgWithUselessDoubleConversion):
        (JSC::B3::testCeilArgWithEffectfulDoubleConversion):
        (JSC::B3::populateWithInterestingValues):
        (JSC::B3::run):
        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::ceil64):
        * jit/ThunkGenerators.cpp:
        (JSC::ceilThunkGenerator):

2015-12-14  Andreas Kling  <akling@apple.com>

        ResourceUsageOverlay should show GC timers.
        <https://webkit.org/b/152151>

        Reviewed by Darin Adler.

        Expose the next fire time (in WTF timestamp style) of a GCActivityCallback.

        * heap/GCActivityCallback.cpp:
        (JSC::GCActivityCallback::scheduleTimer):
        (JSC::GCActivityCallback::cancelTimer):
        * heap/GCActivityCallback.h:

2015-12-14  Filip Pizlo  <fpizlo@apple.com>

        Unreviewed, fix merge issue in a test.

        * b3/testb3.cpp:
        (JSC::B3::testCheckTwoMegaCombos):
        (JSC::B3::testCheckTwoNonRedundantMegaCombos):

2015-12-14  Filip Pizlo  <fpizlo@apple.com>

        B3 should not give ValueReps for the non-stackmap children of a CheckValue to the generator callback
        https://bugs.webkit.org/show_bug.cgi?id=152224

        Reviewed by Geoffrey Garen.

        Previously, a stackmap generator for a Check had to know how many children the B3 value for the
        Check had at the time of code generation. That meant that B3 could not change the kind of Check
        that it was - for example it cannot turn a Check into a Patchpoint and it cannot turn a CheckAdd
        into a Check. But just changing the contract so that the stackmap generation params only get the
        stackmap children of the check means that B3 can transform Checks as it likes.

        This is meant to aid sinking values into checks.

        Also, I found that the effects of a Check did not include HeapRange::top(). I think it's best if
        exitsSideways does not imply reading top, the way that it does in DFG. In the DFG, that makes
        sense because the exit analysis is orthogonal, so the clobber analysis tells you about the reads
        not counting OSR exit - if you need to you can conditionally merge that with World based on a
        separate exit analysis. But in B3, the Effects object tells you about both exiting and reading,
        and it's computed by one analysis. Prior to this change, Check was not setting reads to top() so
        we were effectively saying that Effects::reads is meaningless when exitsSideways is true. It
        seems more sensible to instead force the analysis to set reads to top() when setting
        exitsSideways to true, not least because we only have one such analysis and many users. But it
        also makes sense for another reason: it allows us to bound the set of things that the program
        will read after it exits. That might not be useful to us now, but it's a nice feature to get for
        free. I've seen language features that have behave like exitsSideways that don't also read top,
        like an array bounds check that causes sudden termination without making any promises about how
        pretty the crash dump will look.

        * b3/B3CheckSpecial.cpp:
        (JSC::B3::CheckSpecial::generate):
        * b3/B3Opcode.h:
        * b3/B3Value.cpp:
        (JSC::B3::Value::effects):
        * b3/testb3.cpp:
        (JSC::B3::testSimpleCheck):
        (JSC::B3::testCheckLessThan):
        (JSC::B3::testCheckMegaCombo):
        (JSC::B3::testCheckAddImm):
        (JSC::B3::testCheckAddImmCommute):
        (JSC::B3::testCheckAddImmSomeRegister):
        (JSC::B3::testCheckAdd):
        (JSC::B3::testCheckAdd64):
        (JSC::B3::testCheckSubImm):
        (JSC::B3::testCheckSubBadImm):
        (JSC::B3::testCheckSub):
        (JSC::B3::testCheckSub64):
        (JSC::B3::testCheckNeg):
        (JSC::B3::testCheckNeg64):
        (JSC::B3::testCheckMul):
        (JSC::B3::testCheckMulMemory):
        (JSC::B3::testCheckMul2):
        (JSC::B3::testCheckMul64):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::blessSpeculation):

2015-12-14  Filip Pizlo  <fpizlo@apple.com>

        Air: Support Architecture-specific forms and Opcodes
        https://bugs.webkit.org/show_bug.cgi?id=151736

        Reviewed by Benjamin Poulain.

        This adds really awesome architecture selection to the AirOpcode.opcodes file. If an opcode or
        opcode form is unavailable on some architecture, you can still mention its name in C++ code (it'll
        still be a member of the enum) but isValidForm() and all other reflective queries will tell you
        that it doesn't exist. This will make the instruction selector steer clear of it, and it will
        also ensure that the spiller doesn't try to use any unavailable architecture-specific address
        forms.

        The new capability is documented extensively in a comment in AirOpcode.opcodes.

        * b3/air/AirOpcode.opcodes:
        * b3/air/opcode_generator.rb:

2015-12-14  Mark Lam  <mark.lam@apple.com>

        Misc. small fixes in snippet related code.
        https://bugs.webkit.org/show_bug.cgi?id=152259

        Reviewed by Saam Barati.

        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileArithMul):
        - When loading a constant JSValue for a node, use the one that the node already
          provides instead of reconstructing it.  This is not a bug, but the fix makes
          the code cleaner.

        * jit/JITBitAndGenerator.cpp:
        (JSC::JITBitAndGenerator::generateFastPath):
        - No need to do a bitand with a constant int 0xffffffff operand.

        * jit/JITBitOrGenerator.cpp:
        (JSC::JITBitOrGenerator::generateFastPath):
        - Fix comments: bitor is '|', not '&'.
        - No need to do a bitor with a constant int 0 operand.

        * jit/JITBitXorGenerator.cpp:
        (JSC::JITBitXorGenerator::generateFastPath):
        - Fix comments: bitxor is '^', not '&'.

        * jit/JITRightShiftGenerator.cpp:
        (JSC::JITRightShiftGenerator::generateFastPath):
        - Renamed a jump target name to be clearer about its purpose.

2015-12-14  Mark Lam  <mark.lam@apple.com>

        We should not employ the snippet code in the DFG if no OSR exit was previously encountered.
        https://bugs.webkit.org/show_bug.cgi?id=152255

        Reviewed by Saam Barati.

        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):

2015-12-14  Filip Pizlo  <fpizlo@apple.com>

        B3->Air compare-branch fusion should fuse even if the result of the comparison is used more than once
        https://bugs.webkit.org/show_bug.cgi?id=152198

        Reviewed by Benjamin Poulain.

        If we have a comparison operation that is branched on from multiple places, then we were
        previously executing the comparison to get a boolean result in a register and then we were
        testing/branching on that register in multiple places. This is actually less efficient than
        just fusing the compare/branch multiple times, even though this means that the comparison
        executes multiple times. This would only be bad if the comparison fused loads multiple times,
        since duplicating loads is both wrong and inefficient. So, this adds the notion of sharing to
        compare/branch fusion. If a compare is shared by multiple branches, then we refuse to fuse
        the load.

        To write the test, I needed to zero-extend 8 to 32. In the process of thinking about how to
        do this, I realized that we needed lowerings for SExt8/SExt16. And I realized that the
        lowerings for the other extension operations were not fully fleshed out; for example they
        were incapable of load fusion. This patch fixes this and also adds some smart strength
        reductions for BitAnd(@x, 0xff/0xffff/0xffffffff) - all of which should be lowered to a zero
        extension.

        This is a big win on asm.js code. It's not enough to bridge the gap to LLVM, but it's a huge
        step in that direction.

        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::load8SignedExtendTo32):
        (JSC::MacroAssemblerX86Common::zeroExtend8To32):
        (JSC::MacroAssemblerX86Common::signExtend8To32):
        (JSC::MacroAssemblerX86Common::load16):
        (JSC::MacroAssemblerX86Common::load16SignedExtendTo32):
        (JSC::MacroAssemblerX86Common::zeroExtend16To32):
        (JSC::MacroAssemblerX86Common::signExtend16To32):
        (JSC::MacroAssemblerX86Common::store32WithAddressOffsetPatch):
        * assembler/X86Assembler.h:
        (JSC::X86Assembler::movzbl_rr):
        (JSC::X86Assembler::movsbl_rr):
        (JSC::X86Assembler::movzwl_rr):
        (JSC::X86Assembler::movswl_rr):
        (JSC::X86Assembler::cmovl_rr):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::createGenericCompare):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3ReduceStrength.cpp:
        * b3/air/AirOpcode.opcodes:
        * b3/testb3.cpp:
        (JSC::B3::testCheckMegaCombo):
        (JSC::B3::testCheckTwoMegaCombos):
        (JSC::B3::testCheckTwoNonRedundantMegaCombos):
        (JSC::B3::testCheckAddImm):
        (JSC::B3::testTruncSExt32):
        (JSC::B3::testSExt8):
        (JSC::B3::testSExt8Fold):
        (JSC::B3::testSExt8SExt8):
        (JSC::B3::testSExt8SExt16):
        (JSC::B3::testSExt8BitAnd):
        (JSC::B3::testBitAndSExt8):
        (JSC::B3::testSExt16):
        (JSC::B3::testSExt16Fold):
        (JSC::B3::testSExt16SExt16):
        (JSC::B3::testSExt16SExt8):
        (JSC::B3::testSExt16BitAnd):
        (JSC::B3::testBitAndSExt16):
        (JSC::B3::testSExt32BitAnd):
        (JSC::B3::testBitAndSExt32):
        (JSC::B3::testBasicSelect):
        (JSC::B3::run):

2015-12-14  Chris Dumez  <cdumez@apple.com>

        Roll out r193974 and follow-up fixes as it caused JSC crashes
        https://bugs.webkit.org/show_bug.cgi?id=152256

        Unreviewed, Roll out r193974 and follow-up fixes as it caused JSC crashes.

        * API/JSCallbackObject.h:
        * builtins/FunctionPrototype.js:
        * bytecode/BytecodeBasicBlock.cpp:
        (JSC::isBranch):
        * bytecode/BytecodeList.json:
        * bytecode/BytecodeUseDef.h:
        (JSC::computeUsesForBytecodeOffset):
        (JSC::computeDefsForBytecodeOffset):
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::dumpBytecode):
        * bytecode/ExitKind.cpp:
        (JSC::exitKindToString): Deleted.
        * bytecode/ExitKind.h:
        * bytecode/PreciseJumpTargets.cpp:
        (JSC::getJumpTargetsForBytecodeOffset):
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitCheckHasInstance):
        (JSC::BytecodeGenerator::emitGetById): Deleted.
        * bytecompiler/BytecodeGenerator.h:
        (JSC::BytecodeGenerator::emitTypeOf): Deleted.
        * bytecompiler/NodesCodegen.cpp:
        (JSC::InstanceOfNode::emitBytecode):
        (JSC::LogicalOpNode::emitBytecode): Deleted.
        (JSC::LogicalOpNode::emitBytecodeInConditionContext): Deleted.
        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::parseBlock):
        * dfg/DFGCapabilities.cpp:
        (JSC::DFG::capabilityLevel):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGDoesGC.cpp:
        (JSC::DFG::doesGC):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGHeapLocation.cpp:
        (WTF::printInternal):
        * dfg/DFGHeapLocation.h:
        * dfg/DFGNode.h:
        (JSC::DFG::Node::hasCellOperand): Deleted.
        (JSC::DFG::Node::hasTransition): Deleted.
        * dfg/DFGNodeType.h:
        * dfg/DFGPredictionPropagationPhase.cpp:
        (JSC::DFG::PredictionPropagationPhase::propagate):
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileInstanceOf): Deleted.
        (JSC::DFG::SpeculativeJIT::compileArithAdd): Deleted.
        * dfg/DFGSpeculativeJIT.h:
        (JSC::DFG::SpeculativeJIT::callOperation): Deleted.
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLIntrinsicRepository.h:
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNode):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCheckHasInstance):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileInstanceOf): Deleted.
        (JSC::FTL::DFG::LowerDFGToLLVM::compileHasIndexedProperty): Deleted.
        * jit/CCallHelpers.h:
        (JSC::CCallHelpers::setupArguments): Deleted.
        (JSC::CCallHelpers::setupArgumentsWithExecState): Deleted.
        * jit/JIT.cpp:
        (JSC::JIT::privateCompileMainPass):
        (JSC::JIT::privateCompileSlowCases):
        * jit/JIT.h:
        * jit/JITInlines.h:
        (JSC::JIT::callOperationNoExceptionCheck): Deleted.
        (JSC::JIT::callOperation): Deleted.
        * jit/JITOpcodes.cpp:
        (JSC::JIT::emit_op_check_has_instance):
        (JSC::JIT::emit_op_instanceof):
        (JSC::JIT::emitSlow_op_check_has_instance):
        (JSC::JIT::emitSlow_op_instanceof):
        (JSC::JIT::emit_op_is_undefined): Deleted.
        (JSC::JIT::emitSlow_op_to_number): Deleted.
        (JSC::JIT::emitSlow_op_to_string): Deleted.
        * jit/JITOpcodes32_64.cpp:
        (JSC::JIT::emit_op_check_has_instance):
        (JSC::JIT::emit_op_instanceof):
        (JSC::JIT::emitSlow_op_check_has_instance):
        (JSC::JIT::emitSlow_op_instanceof):
        (JSC::JIT::emit_op_is_undefined): Deleted.
        * jit/JITOperations.cpp:
        * jit/JITOperations.h:
        * llint/LLIntData.cpp:
        (JSC::LLInt::Data::performAssertions): Deleted.
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
        * llint/LLIntSlowPaths.h:
        * llint/LowLevelInterpreter32_64.asm:
        * llint/LowLevelInterpreter64.asm:
        * runtime/CommonIdentifiers.h:
        * runtime/ExceptionHelpers.cpp:
        (JSC::invalidParameterInstanceofSourceAppender):
        (JSC::createInvalidInstanceofParameterError):
        (JSC::createError): Deleted.
        (JSC::createNotAFunctionError): Deleted.
        (JSC::createNotAnObjectError): Deleted.
        * runtime/ExceptionHelpers.h:
        * runtime/FunctionPrototype.cpp:
        (JSC::FunctionPrototype::addFunctionProperties):
        * runtime/FunctionPrototype.h:
        * runtime/JSBoundFunction.cpp:
        (JSC::JSBoundFunction::create): Deleted.
        (JSC::JSBoundFunction::customHasInstance): Deleted.
        * runtime/JSBoundFunction.h:
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        (JSC::JSGlobalObject::visitChildren): Deleted.
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::throwTypeErrorGetterSetter): Deleted.
        * runtime/JSObject.cpp:
        (JSC::JSObject::hasInstance):
        (JSC::JSObject::defaultHasInstance): Deleted.
        (JSC::JSObject::getPropertyNames): Deleted.
        (JSC::JSObject::getOwnPropertyNames): Deleted.
        * runtime/JSObject.h:
        (JSC::JSFinalObject::create): Deleted.
        * runtime/JSTypeInfo.h:
        (JSC::TypeInfo::TypeInfo):
        (JSC::TypeInfo::overridesHasInstance):
        * runtime/WriteBarrier.h:
        (JSC::WriteBarrierBase<Unknown>::slot):
        * tests/es6.yaml:
        * tests/stress/instanceof-custom-hasinstancesymbol.js: Removed.
        * tests/stress/symbol-hasInstance.js: Removed.

2015-12-13  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Remove FTL::Output's doubleEqualOrUnordered()
        https://bugs.webkit.org/show_bug.cgi?id=152234

        Reviewed by Sam Weinig.

        It is unused, one less thing to worry about.

        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::doubleEqualOrUnordered): Deleted.
        * ftl/FTLOutput.h:
        (JSC::FTL::Output::doubleEqualOrUnordered): Deleted.

2015-12-13  Yusuke Suzuki  <utatane.tea@gmail.com>

        [JSC] Should not emit get_by_id for indexed property access
        https://bugs.webkit.org/show_bug.cgi?id=151354

        Reviewed by Darin Adler.

        Before this patch, `a["1"]` is converted to `a.1` get_by_id operation in the bytecode compiler.
        get_by_id emits IC. IC rely on the fact that Structure transition occur when adding / removing object's properties.
        However, it's not true for indexed element properties. They are stored in the element storage and Structure transition does not occur.

        For example, in the following case,

             function getOne(a) { return a['1']; }

             for (var i = 0; i < 36; ++i)
                 getOne({2: true});

             if (!getOne({1: true}))
                 throw new Error("OUT");

        In this case, `a['1']` creates get_by_id. `getOne({2: true})` calls makes getOne's get_by_id to create IC says that,
        "when comming this structure chain, there is no property in "1", so we should return `undefined`".

        After that, we call `getOne({1: true})`. But in this case, `{2: true}` and `{1: true}` have the same structure chain,
        because indexed property addition does not occur structure transition.
        So previous IC fast path is used and return `undefined`. But the correct answer is returning `true`.

        This patch fixes the above issue. When there is string bracket access, we only emits get_by_id if the given string is not an index.
        There are bugs in get_by_id, put_by_id, put_by_id (direct). But only get_by_id poses user observable issue.
        Because in the put_by_id case, the generic path just says "this put is uncacheable".

        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitGetById):
        (JSC::BytecodeGenerator::emitPutById):
        (JSC::BytecodeGenerator::emitDirectPutById):
        * bytecompiler/NodesCodegen.cpp:
        (JSC::isNonIndexStringElement):
        (JSC::BracketAccessorNode::emitBytecode):
        (JSC::FunctionCallBracketNode::emitBytecode):
        (JSC::AssignBracketNode::emitBytecode):
        (JSC::ObjectPatternNode::bindValue):
        * tests/stress/element-property-get-should-not-handled-with-get-by-id.js: Added.
        (getOne):

2015-12-13  Andreas Kling  <akling@apple.com>

        CachedScript could have a copy-free path for all-ASCII scripts.
        <https://webkit.org/b/152203>

        Reviewed by Antti Koivisto.

        Make SourceProvider vend a StringView instead of a String.
        This relaxes the promises that providers have to make about string lifetimes.

        This means that on the WebCore side, CachedScript is free to cache a String
        internally, while only ever exposing it as a temporary StringView.

        A few extra copies (CPU, not memory) are introduced, none of them on hot paths.

        * API/JSScriptRef.cpp:
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::sourceCodeForTools):
        (JSC::CodeBlock::dumpSource):
        * inspector/ScriptDebugServer.cpp:
        (Inspector::ScriptDebugServer::dispatchDidParseSource):
        (Inspector::ScriptDebugServer::dispatchFailedToParseSource):
        * interpreter/Interpreter.cpp:
        (JSC::Interpreter::execute):
        * jsc.cpp:
        (functionFindTypeForExpression):
        (functionHasBasicBlockExecuted):
        (functionBasicBlockExecutionCount):
        * parser/Lexer.cpp:
        (JSC::Lexer<T>::setCode):
        * parser/Lexer.h:
        (JSC::Lexer<LChar>::setCodeStart):
        (JSC::Lexer<UChar>::setCodeStart):
        * parser/Parser.h:
        (JSC::Parser::getToken):
        * parser/SourceCode.cpp:
        (JSC::SourceCode::toUTF8):
        * parser/SourceCode.h:
        (JSC::SourceCode::hash):
        (JSC::SourceCode::view):
        (JSC::SourceCode::toString): Deleted.
        * parser/SourceCodeKey.h:
        (JSC::SourceCodeKey::SourceCodeKey):
        (JSC::SourceCodeKey::string):
        * parser/SourceProvider.h:
        (JSC::SourceProvider::getRange):
        * runtime/Completion.cpp:
        (JSC::loadAndEvaluateModule):
        (JSC::loadModule):
        * runtime/ErrorInstance.cpp:
        (JSC::appendSourceToError):
        * runtime/FunctionPrototype.cpp:
        (JSC::functionProtoFuncToString):
        * tools/FunctionOverrides.cpp:
        (JSC::initializeOverrideInfo):
        (JSC::FunctionOverrides::initializeOverrideFor):

2015-12-12  Benjamin Poulain  <benjamin@webkit.org>

        [JSC] Add lowering for B3's Store8 opcode
        https://bugs.webkit.org/show_bug.cgi?id=152208

        Reviewed by Geoffrey Garen.

        B3 has an opcode to store 8bit values but it had
        no lowering.

        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::createStore):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/air/AirOpcode.opcodes:
        * b3/testb3.cpp:
        (JSC::B3::testStore8Arg):
        (JSC::B3::testStore8Imm):
        (JSC::B3::testStorePartial8BitRegisterOnX86):
        (JSC::B3::run):

2015-12-12  Csaba Osztrogonác  <ossy@webkit.org>

        [ARM] Add the missing setupArgumentsWithExecState functions after r193974
        https://bugs.webkit.org/show_bug.cgi?id=152214

        Reviewed by Mark Lam.

        * jit/CCallHelpers.h:
        (JSC::CCallHelpers::setupArgumentsWithExecState):

2015-12-11  Joseph Pecoraro  <pecoraro@apple.com>

        Web Inspector: Too many derefs when RemoteInspectorXPCConnection fails to validate connection
        https://bugs.webkit.org/show_bug.cgi?id=152213

        Rubber-stamped by Ryosuke Niwa.

        * inspector/remote/RemoteInspectorXPCConnection.mm:
        (Inspector::RemoteInspectorXPCConnection::handleEvent):
        We should just close the XPC connection triggering XPC_ERROR_CONNECTION_INVALID
        which will then graceful teardown the connection as expected.

2015-12-11  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Add Floating Point Abs() to B3
        https://bugs.webkit.org/show_bug.cgi?id=152176

        Reviewed by Geoffrey Garen.

        This patch adds an Abs() operation for floating point.

        On x86, Abs() is implemented by masking the top bit
        of the floating point value. On ARM64, there is a builtin
        abs opcode.

        To account for those differences, B3 use "Abs" as
        the cannonical operation. When we are about to lower
        to Air, Abs is extended on x86 to get a clean handling
        of the mask constants.

        This patch has one cool thing related to FTL.
        If you do:
           @1 = unboxDouble(@0)
           @2 = abs(@1)
           @3 = boxDouble(@2)

        B3ReduceStrength completely eliminate the Double-Integer
        conversion.

        The strength reduction of Abs is aware that it can do a bit
        mask over the bitcast used by unboxing.
        If even works if you use floats by forcing fround: reduceDoubleToFloat()
        elminiates the useless conversions, followed by ReduceStrength
        that removes the switch from GP to FP.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::andDouble):
        (JSC::MacroAssemblerX86Common::andFloat):
        * assembler/X86Assembler.h:
        (JSC::X86Assembler::andps_rr):
        * b3/B3ConstDoubleValue.cpp:
        (JSC::B3::ConstDoubleValue::bitAndConstant):
        (JSC::B3::ConstDoubleValue::absConstant):
        * b3/B3ConstDoubleValue.h:
        * b3/B3ConstFloatValue.cpp:
        (JSC::B3::ConstFloatValue::bitAndConstant):
        (JSC::B3::ConstFloatValue::absConstant):
        * b3/B3ConstFloatValue.h:
        * b3/B3Generate.cpp:
        (JSC::B3::generateToAir):
        * b3/B3LowerMacrosAfterOptimizations.cpp: Added.
        (JSC::B3::lowerMacrosAfterOptimizations):
        * b3/B3LowerMacrosAfterOptimizations.h: Added.
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3Opcode.cpp:
        (WTF::printInternal):
        * b3/B3Opcode.h:
        * b3/B3ReduceDoubleToFloat.cpp:
        * b3/B3ReduceStrength.cpp:
        * b3/B3Validate.cpp:
        * b3/B3Value.cpp:
        (JSC::B3::Value::absConstant):
        (JSC::B3::Value::effects):
        (JSC::B3::Value::key):
        (JSC::B3::Value::typeFor):
        * b3/B3Value.h:
        * b3/air/AirOpcode.opcodes:
        * b3/testb3.cpp:
        (JSC::B3::bitAndDouble):
        (JSC::B3::testBitAndArgDouble):
        (JSC::B3::testBitAndArgsDouble):
        (JSC::B3::testBitAndArgImmDouble):
        (JSC::B3::testBitAndImmsDouble):
        (JSC::B3::bitAndFloat):
        (JSC::B3::testBitAndArgFloat):
        (JSC::B3::testBitAndArgsFloat):
        (JSC::B3::testBitAndArgImmFloat):
        (JSC::B3::testBitAndImmsFloat):
        (JSC::B3::testBitAndArgsFloatWithUselessDoubleConversion):
        (JSC::B3::testAbsArg):
        (JSC::B3::testAbsImm):
        (JSC::B3::testAbsMem):
        (JSC::B3::testAbsAbsArg):
        (JSC::B3::testAbsBitwiseCastArg):
        (JSC::B3::testBitwiseCastAbsBitwiseCastArg):
        (JSC::B3::testAbsArgWithUselessDoubleConversion):
        (JSC::B3::testAbsArgWithEffectfulDoubleConversion):
        (JSC::B3::run):
        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::doubleAbs):

2015-12-11  Mark Lam  <mark.lam@apple.com>

        Removed some dead code, and simplified some code in the baseline JIT.
        https://bugs.webkit.org/show_bug.cgi?id=152199

        Reviewed by Benjamin Poulain.

        * jit/JIT.h:
        * jit/JITArithmetic.cpp:
        (JSC::JIT::emitBitBinaryOpFastPath):
        (JSC::JIT::emit_op_bitand):
        (JSC::JIT::emitSlow_op_lshift):
        (JSC::JIT::emitRightShiftFastPath):
        (JSC::JIT::emit_op_rshift):
        (JSC::JIT::emitSlow_op_rshift):
        (JSC::JIT::emit_op_urshift):
        (JSC::JIT::emitSlow_op_urshift):

2015-12-11  Filip Pizlo  <fpizlo@apple.com>

        B3::reduceStrength should remove redundant Phi's
        https://bugs.webkit.org/show_bug.cgi?id=152184

        Reviewed by Benjamin Poulain.

        This adds redundant Phi removal using Aycock and Horspools SSA simplification algorithm. This
        is needed because even in simple asm.js code, we see a lot of CFG simplification that leaves
        behind totally useless Phi's.

        * b3/B3PhiChildren.cpp:
        (JSC::B3::PhiChildren::PhiChildren):
        * b3/B3PhiChildren.h:
        (JSC::B3::PhiChildren::at):
        (JSC::B3::PhiChildren::operator[]):
        (JSC::B3::PhiChildren::phis):
        * b3/B3ReduceStrength.cpp:

2015-12-11  Benjamin Poulain  <benjamin@webkit.org>

        [JSC] Add an implementation of pow() taking an integer exponent to B3
        https://bugs.webkit.org/show_bug.cgi?id=152165

        Reviewed by Mark Lam.

        LLVM has this really neat optimized opcode for
        raising the power of something by an integer exponent.

        There is no such native instruction so we need to extend
        the existing FTLOutput API to something efficient.

        DFG has a pretty competitive implementation. In this patch,
        I added a version of it to B3.
        I created powDoubleInt32() instead of putting the code directly
        in FTL for easier testing and optimization.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/B3MathExtras.cpp: Added.
        (JSC::B3::powDoubleInt32):
        * b3/B3MathExtras.h: Added.
        * b3/B3MemoryValue.h:
        * b3/testb3.cpp:
        (JSC::B3::testPowDoubleByIntegerLoop):
        (JSC::B3::run):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::compileArithPowIntegerFastPath):
        * ftl/FTLB3Output.cpp:
        (JSC::FTL::Output::doublePowi):
        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::doublePowi): Deleted.

2015-12-11  Filip Pizlo  <fpizlo@apple.com>

        B3 should have CSE
        https://bugs.webkit.org/show_bug.cgi?id=150961

        Reviewed by Benjamin Poulain.

        This implements a very simple CSE for pure values. I need this as a prerequisite for other
        optimizations that I'm implementing. For now, this is neutral on imaging-gaussian-blur but a
        slow-down on asm.js code. I suspect that the asm.js slow-down is because of other things that are
        still going wrong, and anyway, I need CSE to be able to do even the most basic asm.js strength
        reductions.

        * b3/B3ReduceStrength.cpp:
        * b3/B3ReduceStrength.h:
        * b3/B3Value.cpp:
        (JSC::B3::Value::replaceWithIdentity):
        (JSC::B3::Value::key):

2015-12-11  Mark Lam  <mark.lam@apple.com>

        Refactoring to reduce potential cut-paste errors with the FTL ICs.
        https://bugs.webkit.org/show_bug.cgi?id=152185

        Reviewed by Saam Barati.

        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
        * JavaScriptCore.xcodeproj/project.pbxproj:

        * ftl/FTLCompile.cpp:
        - ICs now have their own names.  GetById and PutByID fast path ICs no longer just
          say "inline cache fast path".

        * ftl/FTLCompileBinaryOp.cpp:
        (JSC::FTL::generateBinaryArithOpFastPath):
        - Fixed an indentation.

        * ftl/FTLInlineCacheDescriptor.h:
        (JSC::FTL::InlineCacheDescriptor::InlineCacheDescriptor):
        (JSC::FTL::InlineCacheDescriptor::name):
        (JSC::FTL::GetByIdDescriptor::GetByIdDescriptor):
        (JSC::FTL::PutByIdDescriptor::PutByIdDescriptor):
        (JSC::FTL::CheckInDescriptor::CheckInDescriptor):
        (JSC::FTL::BinaryOpDescriptor::nodeType):
        (JSC::FTL::BinaryOpDescriptor::size):
        (JSC::FTL::BinaryOpDescriptor::slowPathFunction):
        (JSC::FTL::BinaryOpDescriptor::leftOperand):
        (JSC::FTL::BinaryOpDescriptor::BinaryOpDescriptor):
        (JSC::FTL::ArithDivDescriptor::ArithDivDescriptor):
        (JSC::FTL::ArithDivDescriptor::icSize):
        (JSC::FTL::ArithDivDescriptor::nodeType):
        (JSC::FTL::ArithDivDescriptor::opName):
        (JSC::FTL::ArithDivDescriptor::slowPathFunction):
        (JSC::FTL::ArithDivDescriptor::nonNumberSlowPathFunction):
        (JSC::FTL::ArithMulDescriptor::ArithMulDescriptor):
        (JSC::FTL::ArithMulDescriptor::icSize):
        (JSC::FTL::ArithMulDescriptor::nodeType):
        (JSC::FTL::ArithMulDescriptor::opName):
        (JSC::FTL::ArithMulDescriptor::slowPathFunction):
        (JSC::FTL::ArithMulDescriptor::nonNumberSlowPathFunction):
        (JSC::FTL::ArithSubDescriptor::ArithSubDescriptor):
        (JSC::FTL::ArithSubDescriptor::icSize):
        (JSC::FTL::ArithSubDescriptor::nodeType):
        (JSC::FTL::ArithSubDescriptor::opName):
        (JSC::FTL::ArithSubDescriptor::slowPathFunction):
        (JSC::FTL::ArithSubDescriptor::nonNumberSlowPathFunction):
        (JSC::FTL::ValueAddDescriptor::ValueAddDescriptor):
        (JSC::FTL::ValueAddDescriptor::icSize):
        (JSC::FTL::ValueAddDescriptor::nodeType):
        (JSC::FTL::ValueAddDescriptor::opName):
        (JSC::FTL::ValueAddDescriptor::slowPathFunction):
        (JSC::FTL::ValueAddDescriptor::nonNumberSlowPathFunction):
        (JSC::FTL::LazySlowPathDescriptor::LazySlowPathDescriptor):
        (JSC::FTL::ProbeDescriptor::ProbeDescriptor):
        (JSC::FTL::BinaryOpDescriptor::name): Deleted.
        (JSC::FTL::BinaryOpDescriptor::fastPathICName): Deleted.
        * ftl/FTLInlineCacheDescriptorInlines.h: Removed.
        - Consolidate the number of places where we have to fill in a data about new
          snippet ICs.  It is all done in FTLInlineCacheDescriptor.h now.   

        * ftl/FTLJITFinalizer.cpp:
        (JSC::FTL::JITFinalizer::finalizeFunction):

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileUntypedBinaryOp):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileValueAdd):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithAddOrSub):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithMul):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithDiv):
        - Introduced a compileUntypedBinaryOp() template and use that at all the FTL
          places that need to use a snippet.  This reduces the amount of cut and paste
          code.

        * ftl/FTLState.h:
        - Removed a bad #include.

2015-12-11  Keith Miller  <keith_miller@apple.com>

        Overrides has instance should not move ValueFalse to a register then immediately to the stack in the LLInt.
        https://bugs.webkit.org/show_bug.cgi?id=152188

        Reviewed by Mark Lam.

        This fixes a minor issue with the code for the overrides_has_instance in the LLInt. Old code had an extra move,
        which is both slow and breaks the build on cloop.

        * llint/LowLevelInterpreter64.asm:

2015-12-11  Keith Miller  <keith_miller@apple.com>

        [ES6] Add support for Symbol.hasInstance
        https://bugs.webkit.org/show_bug.cgi?id=151839

        Reviewed by Saam Barati.

        This patch adds support for Symbol.hasInstance, unfortunately in order to prevent
        regressions several new bytecodes and DFG IR nodes were necessary. Before, Symbol.hasInstance
        when executing an instanceof expression we would emit three bytecodes: overrides_has_instance, get_by_id,
        then instanceof. As the spec has changed, we emit a more complicated set of bytecodes in addition to some
        new ones. First the role of overrides_has_instance and its corresponding DFG node have changed. Now it returns
        a js-boolean indicating whether the RHS of the instanceof expression (from here on called the constructor for simplicity)
        needs non-default behavior for resolving the expression. i.e. The constructor has a Symbol.hasInstance that differs from the one on
        Function.prototype[Symbol.hasInstance] or is a bound/C-API function. Once we get to the DFG this node is generally eliminated as
        we can prove the value of Symbol.hasInstance is a constant. The second new bytecode is instanceof_custom. insntanceof_custom, just
        emits a call to slow path code that computes the result.

        In the DFG, there is also a new node, CheckTypeInfoFlags, which checks the type info flags are consistent with the ones provided and
        OSR exits if the flags are not. Additionally, we attempt to prove that the result of CheckHasValue will be a constant and transform
        it into a CheckTypeInfoFlags followed by a JSConstant.

        * API/JSCallbackObject.h:
        * builtins/FunctionPrototype.js:
        (symbolHasInstance):
        * bytecode/BytecodeBasicBlock.cpp:
        (JSC::isBranch): Deleted.
        * bytecode/BytecodeList.json:
        * bytecode/BytecodeUseDef.h:
        (JSC::computeUsesForBytecodeOffset):
        (JSC::computeDefsForBytecodeOffset):
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::dumpBytecode):
        * bytecode/ExitKind.cpp:
        (JSC::exitKindToString):
        * bytecode/ExitKind.h:
        * bytecode/PreciseJumpTargets.cpp:
        (JSC::getJumpTargetsForBytecodeOffset): Deleted.
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitOverridesHasInstance):
        (JSC::BytecodeGenerator::emitInstanceOfCustom):
        (JSC::BytecodeGenerator::emitCheckHasInstance): Deleted.
        * bytecompiler/BytecodeGenerator.h:
        * bytecompiler/NodesCodegen.cpp:
        (JSC::InstanceOfNode::emitBytecode):
        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::parseBlock):
        * dfg/DFGCapabilities.cpp:
        (JSC::DFG::capabilityLevel):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGDoesGC.cpp:
        (JSC::DFG::doesGC):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGHeapLocation.cpp:
        (WTF::printInternal):
        * dfg/DFGHeapLocation.h:
        * dfg/DFGNode.h:
        (JSC::DFG::Node::hasCellOperand):
        (JSC::DFG::Node::hasTypeInfoOperand):
        (JSC::DFG::Node::typeInfoOperand):
        * dfg/DFGNodeType.h:
        * dfg/DFGPredictionPropagationPhase.cpp:
        (JSC::DFG::PredictionPropagationPhase::propagate):
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileCheckTypeInfoFlags):
        (JSC::DFG::SpeculativeJIT::compileInstanceOfCustom):
        * dfg/DFGSpeculativeJIT.h:
        (JSC::DFG::SpeculativeJIT::callOperation):
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLIntrinsicRepository.h:
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNode):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileOverridesHasInstance):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCheckTypeInfoFlags):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileInstanceOfCustom):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCheckHasInstance): Deleted.
        * jit/JIT.cpp:
        (JSC::JIT::privateCompileMainPass):
        (JSC::JIT::privateCompileSlowCases):
        * jit/JIT.h:
        * jit/JITInlines.h:
        (JSC::JIT::callOperation):
        * jit/JITOpcodes.cpp:
        (JSC::JIT::emit_op_overrides_has_instance):
        (JSC::JIT::emit_op_instanceof):
        (JSC::JIT::emit_op_instanceof_custom):
        (JSC::JIT::emitSlow_op_instanceof):
        (JSC::JIT::emitSlow_op_instanceof_custom):
        (JSC::JIT::emit_op_check_has_instance): Deleted.
        (JSC::JIT::emitSlow_op_check_has_instance): Deleted.
        * jit/JITOpcodes32_64.cpp:
        (JSC::JIT::emit_op_overrides_has_instance):
        (JSC::JIT::emit_op_instanceof):
        (JSC::JIT::emit_op_instanceof_custom):
        (JSC::JIT::emitSlow_op_instanceof_custom):
        (JSC::JIT::emit_op_check_has_instance): Deleted.
        (JSC::JIT::emitSlow_op_check_has_instance): Deleted.
        * jit/JITOperations.cpp:
        * jit/JITOperations.h:
        * llint/LLIntData.cpp:
        (JSC::LLInt::Data::performAssertions):
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
        * llint/LLIntSlowPaths.h:
        * llint/LowLevelInterpreter32_64.asm:
        * llint/LowLevelInterpreter64.asm:
        * runtime/CommonIdentifiers.h:
        * runtime/ExceptionHelpers.cpp:
        (JSC::invalidParameterInstanceofSourceAppender):
        (JSC::invalidParameterInstanceofNotFunctionSourceAppender):
        (JSC::invalidParameterInstanceofhasInstanceValueNotFunctionSourceAppender):
        (JSC::createInvalidInstanceofParameterErrorNotFunction):
        (JSC::createInvalidInstanceofParameterErrorhasInstanceValueNotFunction):
        (JSC::createInvalidInstanceofParameterError): Deleted.
        * runtime/ExceptionHelpers.h:
        * runtime/FunctionPrototype.cpp:
        (JSC::FunctionPrototype::addFunctionProperties):
        * runtime/FunctionPrototype.h:
        * runtime/JSBoundFunction.cpp:
        (JSC::isBoundFunction):
        (JSC::hasInstanceBoundFunction):
        * runtime/JSBoundFunction.h:
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        (JSC::JSGlobalObject::visitChildren):
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::functionProtoHasInstanceSymbolFunction):
        * runtime/JSObject.cpp:
        (JSC::JSObject::hasInstance):
        (JSC::objectPrivateFuncInstanceOf):
        * runtime/JSObject.h:
        * runtime/JSTypeInfo.h:
        (JSC::TypeInfo::TypeInfo):
        (JSC::TypeInfo::overridesHasInstance):
        * runtime/WriteBarrier.h:
        (JSC::WriteBarrierBase<Unknown>::slot):
        * tests/es6.yaml:
        * tests/stress/instanceof-custom-hasinstancesymbol.js: Added.
        (Constructor):
        (value):
        (instanceOf):
        (body):
        * tests/stress/symbol-hasInstance.js: Added.
        (Constructor):
        (value):
        (ObjectClass.Symbol.hasInstance):
        (NumberClass.Symbol.hasInstance):

2015-12-11  Joseph Pecoraro  <pecoraro@apple.com>

        check-for-inappropriate-objc-class-names should check all class names, not just externally visible ones
        https://bugs.webkit.org/show_bug.cgi?id=152156

        Reviewed by Dan Bernstein.

        * llvm/InitializeLLVMMac.cpp:
        Remove stale comment. The ObjC class this comment referenced
        has already been removed.

2015-12-11  Benjamin Poulain  <benjamin@webkit.org>

        [JSC] Little cleanup of FTLOutput type casts and conversions
        https://bugs.webkit.org/show_bug.cgi?id=152166

        Reviewed by Geoffrey Garen.

        Clean up:
        -Change fpCast() to explicit conversion doubleToFloat() and floatToDouble()
         to match B3's opcodes.
        -Remove unused conversion functions.
        -Use the most specific cast function when possible.
        -Functions that are only used inside FTLOutput are made private.
         In FTLB3Output, those functions were removed.

        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::doubleToFloat):
        (JSC::FTL::Output::floatToDouble):
        (JSC::FTL::Output::fround):
        (JSC::FTL::Output::fpToInt): Deleted.
        (JSC::FTL::Output::fpToUInt): Deleted.
        (JSC::FTL::Output::intToFP): Deleted.
        (JSC::FTL::Output::unsignedToFP): Deleted.
        (JSC::FTL::Output::intCast): Deleted.
        (JSC::FTL::Output::fpCast): Deleted.
        (JSC::FTL::Output::intToPtr): Deleted.
        (JSC::FTL::Output::ptrToInt): Deleted.
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileGetByVal):
        (JSC::FTL::DFG::LowerDFGToLLVM::compilePutByVal):
        * ftl/FTLOutput.h:
        (JSC::FTL::Output::doubleToFloat):
        (JSC::FTL::Output::floatToDouble):
        (JSC::FTL::Output::intCast):
        (JSC::FTL::Output::fpToInt):
        (JSC::FTL::Output::fpToUInt):
        (JSC::FTL::Output::fpCast):
        (JSC::FTL::Output::intToFP):
        (JSC::FTL::Output::unsignedToFP):

2015-12-10  Youenn Fablet  <youenn.fablet@crf.canon.fr>

        Binding and builtin generators should lowercase RTCXX as rtcXX and not rTCXX
        https://bugs.webkit.org/show_bug.cgi?id=152121

        Reviewed by Darin Adler.

        * Scripts/builtins/builtins_generator.py:
        (WK_lcfirst): Added RTC special rule.

2015-12-09  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should be able to run quicksort asm.js test
        https://bugs.webkit.org/show_bug.cgi?id=152105

        Reviewed by Geoffrey Garen.

        This covers making all of the changes needed to run quicksort.js from AsmBench.

        - Reintroduced float types to FTLLower since we now have B3::Float.

        - Gave FTL::Output the ability to speak of load types and store types separately from LValue
          types. This dodges the problem that B3 doesn't have types for Int8 and Int16 but supports loads
          and stores of that type.

        - Implemented Mod in B3 and wrote tests.

        I also fixed a pre-existing bug in a test that appeared to only manifest in release builds.

        Currently, B3's performance on asm.js tests is not good. It should be easy to fix:

        - B3 should strength-reduce the shifting madness that happens in asm.js memory accesses
          https://bugs.webkit.org/show_bug.cgi?id=152106

        - B3 constant hoisting should have a story for the asm.js heap constant
          https://bugs.webkit.org/show_bug.cgi?id=152107

        * b3/B3CCallValue.h:
        * b3/B3Const32Value.cpp:
        (JSC::B3::Const32Value::divConstant):
        (JSC::B3::Const32Value::modConstant):
        (JSC::B3::Const32Value::bitAndConstant):
        * b3/B3Const32Value.h:
        * b3/B3Const64Value.cpp:
        (JSC::B3::Const64Value::divConstant):
        (JSC::B3::Const64Value::modConstant):
        (JSC::B3::Const64Value::bitAndConstant):
        * b3/B3Const64Value.h:
        * b3/B3ReduceStrength.cpp:
        * b3/B3Validate.cpp:
        * b3/B3Value.cpp:
        (JSC::B3::Value::divConstant):
        (JSC::B3::Value::modConstant):
        (JSC::B3::Value::bitAndConstant):
        * b3/B3Value.h:
        * b3/testb3.cpp:
        (JSC::B3::testChillDiv64):
        (JSC::B3::testMod):
        (JSC::B3::testSwitch):
        (JSC::B3::run):
        * ftl/FTLB3Output.cpp:
        (JSC::FTL::Output::load16ZeroExt32):
        (JSC::FTL::Output::store):
        (JSC::FTL::Output::store32As8):
        (JSC::FTL::Output::store32As16):
        (JSC::FTL::Output::loadFloatToDouble): Deleted.
        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::mul):
        (JSC::FTL::Output::div):
        (JSC::FTL::Output::chillDiv):
        (JSC::FTL::Output::rem):
        (JSC::FTL::Output::neg):
        (JSC::FTL::Output::load32):
        (JSC::FTL::Output::load64):
        (JSC::FTL::Output::loadPtr):
        (JSC::FTL::Output::loadFloat):
        (JSC::FTL::Output::loadDouble):
        (JSC::FTL::Output::store32):
        (JSC::FTL::Output::store64):
        (JSC::FTL::Output::storePtr):
        (JSC::FTL::Output::storeFloat):
        (JSC::FTL::Output::storeDouble):
        (JSC::FTL::Output::addPtr):
        (JSC::FTL::Output::extractValue):
        (JSC::FTL::Output::call):
        (JSC::FTL::Output::operation):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileGetByVal):
        (JSC::FTL::DFG::LowerDFGToLLVM::compilePutByVal):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArrayPush):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArrayPop):
        * ftl/FTLOutput.cpp:
        (JSC::FTL::Output::Output):
        (JSC::FTL::Output::store):
        (JSC::FTL::Output::check):
        (JSC::FTL::Output::load):
        * ftl/FTLOutput.h:
        (JSC::FTL::Output::load32):
        (JSC::FTL::Output::load64):
        (JSC::FTL::Output::loadPtr):
        (JSC::FTL::Output::loadFloat):
        (JSC::FTL::Output::loadDouble):
        (JSC::FTL::Output::store32As8):
        (JSC::FTL::Output::store32As16):
        (JSC::FTL::Output::store32):
        (JSC::FTL::Output::store64):
        (JSC::FTL::Output::storePtr):
        (JSC::FTL::Output::storeFloat):
        (JSC::FTL::Output::storeDouble):
        (JSC::FTL::Output::addPtr):
        (JSC::FTL::Output::loadFloatToDouble): Deleted.
        (JSC::FTL::Output::store16): Deleted.

2015-12-10  Filip Pizlo  <fpizlo@apple.com>

        Consider still matching an address expression even if B3 has already assigned a Tmp to it
        https://bugs.webkit.org/show_bug.cgi?id=150777

        Reviewed by Geoffrey Garen.

        We need some heuristic for when an address should be computed as a separate instruction. It's
        usually profitable to sink the address into the memory access. The previous heuristic meant that
        the address would get separate instructions if it was in a separate block from the memory access.
        This was messing up codegen of things like PutByVal out-of-bounds, where the address is computed
        in one block and then used in another. I don't think that which block owns the address
        computation should factor into any heuristic here, since it's so fragile: the compiler may lower
        something by splitting blocks and we don't want this to ruin performance.

        So, this replaces that heuristic with a more sensible one: the address computation gets its own
        instruction if it has a lot of uses. In practice this means that we always sink the address
        computation into the memory access.

        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::effectiveAddr):

2015-12-10  Daniel Bates  <dabates@apple.com>

        [CSP] eval() is not blocked for stringified literals
        https://bugs.webkit.org/show_bug.cgi?id=152158
        <rdar://problem/15775625>

        Reviewed by Saam Barati.

        Fixes an issue where stringified literals can be eval()ed despite being disallowed by
        Content Security Policy of the page.

        * interpreter/Interpreter.cpp:
        (JSC::eval): Throw a JavaScript EvalError exception if eval() is disallowed for the page
        and return undefined.
        * runtime/JSGlobalObjectFunctions.cpp:
        (JSC::globalFuncEval): Ditto.

2015-12-10  Joseph Pecoraro  <pecoraro@apple.com>

        Fix jsc symlink creation on iOS
        https://bugs.webkit.org/show_bug.cgi?id=152155

        Reviewed by Dan Bernstein.

        * JavaScriptCore.xcodeproj/project.pbxproj:
        Switch from INSTALL_PATH_ACTUAL to just INSTALL_PATH.
        Remove now unnecessary INSTALL_PATH_PREFIX use as well.

2015-12-10  Joseph Pecoraro  <pecoraro@apple.com>

        Remote Inspector: Verify the identity of the other side of XPC connections
        https://bugs.webkit.org/show_bug.cgi?id=152153

        Reviewed by Brian Burg.

        * JavaScriptCore.xcodeproj/project.pbxproj:
        Link with the Security framework.

        * inspector/remote/RemoteInspectorXPCConnection.h:
        * inspector/remote/RemoteInspectorXPCConnection.mm:
        (auditTokenHasEntitlement):
        (Inspector::RemoteInspectorXPCConnection::handleEvent):
        (Inspector::RemoteInspectorXPCConnection::RemoteInspectorXPCConnection): Deleted.
        When receiving the first message, verify the XPC connection
        is connected to who we thought we were connected to and
        Bail if it isn't.

2015-12-10  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Add a Modulo operator to B3, and a chill variant
        https://bugs.webkit.org/show_bug.cgi?id=152110

        Reviewed by Geoffrey Garen.

        It is basically refactoring the Div and ChillDiv
        code to be used by both opcodes.

        * b3/B3Common.h:
        (JSC::B3::chillDiv):
        (JSC::B3::chillMod):
        * b3/B3Const32Value.cpp:
        (JSC::B3::Const32Value::modConstant):
        * b3/B3Const32Value.h:
        * b3/B3Const64Value.cpp:
        (JSC::B3::Const64Value::modConstant):
        * b3/B3Const64Value.h:
        * b3/B3ConstDoubleValue.cpp:
        (JSC::B3::ConstDoubleValue::modConstant):
        * b3/B3ConstDoubleValue.h:
        * b3/B3LowerMacros.cpp:
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::lower):
        (JSC::B3::Air::LowerToAir::lowerX86Div):
        * b3/B3Opcode.cpp:
        (WTF::printInternal):
        * b3/B3Opcode.h:
        * b3/B3ReduceStrength.cpp:
        * b3/B3Validate.cpp:
        * b3/B3Value.cpp:
        (JSC::B3::Value::modConstant):
        (JSC::B3::Value::effects):
        (JSC::B3::Value::key):
        (JSC::B3::Value::typeFor):
        * b3/B3Value.h:
        * b3/testb3.cpp:
        (JSC::B3::testModArgDouble):
        (JSC::B3::testModArgsDouble):
        (JSC::B3::testModArgImmDouble):
        (JSC::B3::testModImmArgDouble):
        (JSC::B3::testModImmsDouble):
        (JSC::B3::testModArgFloat):
        (JSC::B3::testModArgsFloat):
        (JSC::B3::testModArgImmFloat):
        (JSC::B3::testModImmArgFloat):
        (JSC::B3::testModImmsFloat):
        (JSC::B3::testModArg):
        (JSC::B3::testModArgs):
        (JSC::B3::testModImms):
        (JSC::B3::testModArg32):
        (JSC::B3::testModArgs32):
        (JSC::B3::testModImms32):
        (JSC::B3::testChillModArg):
        (JSC::B3::testChillModArgs):
        (JSC::B3::testChillModImms):
        (JSC::B3::testChillModArg32):
        (JSC::B3::testChillModArgs32):
        (JSC::B3::testChillModImms32):
        (JSC::B3::run):
        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::mod):
        (JSC::FTL::Output::chillMod):
        (JSC::FTL::Output::doubleMod):
        (JSC::FTL::Output::rem): Deleted.
        (JSC::FTL::Output::doubleRem): Deleted.
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithMod):
        * ftl/FTLOutput.cpp:
        (JSC::FTL::Output::chillMod):
        * ftl/FTLOutput.h:
        (JSC::FTL::Output::mod):
        (JSC::FTL::Output::doubleMod):
        (JSC::FTL::Output::rem): Deleted.
        (JSC::FTL::Output::doubleRem): Deleted.

2015-12-10  Csaba Osztrogonác  <ossy@webkit.org>

        [B3] Add new files to the cmake build system
        https://bugs.webkit.org/show_bug.cgi?id=152120

        Reviewed by Filip Pizlo.

        * CMakeLists.txt:

2015-12-10  Csaba Osztrogonác  <ossy@webkit.org>

        [B3] Use mark pragmas only if it is supported
        https://bugs.webkit.org/show_bug.cgi?id=152123

        Reviewed by Mark Lam.

        * ftl/FTLB3Output.h:

2015-12-10  Csaba Osztrogonác  <ossy@webkit.org>

        [B3] Typo fix in testb3.cpp
        https://bugs.webkit.org/show_bug.cgi?id=152126

        Reviewed by Mark Lam.

        * b3/testb3.cpp:
        (JSC::B3::populateWithInterestingValues):

2015-12-10  Csaba Osztrogonác  <ossy@webkit.org>

        [B3] Fix unused-but-set-variable warning
        https://bugs.webkit.org/show_bug.cgi?id=152122

        Reviewed by Mark Lam.

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::lower):

2015-12-10  Csaba Osztrogonác  <ossy@webkit.org>

        [B3] Make GCC ignore warnings in FTLB3Output.h
        https://bugs.webkit.org/show_bug.cgi?id=152124

        Reviewed by Mark Lam.

        * ftl/FTLB3Output.h:

2015-12-10  Csaba Osztrogonác  <ossy@webkit.org>

        [EFL] Remove the unused IncrementalSweeper::m_isTimerFrozen member after r193749
        https://bugs.webkit.org/show_bug.cgi?id=152127

        Reviewed by Mark Lam.

        * heap/IncrementalSweeper.h:

2015-12-10  Csaba Osztrogonác  <ossy@webkit.org>

        Source/JavaScriptCore/create_hash_table shouldn't be too verbose
        https://bugs.webkit.org/show_bug.cgi?id=151861

        Reviewed by Darin Adler.

        * create_hash_table:

2015-12-10  Youenn Fablet  <youenn.fablet@crf.canon.fr>

        JSC Builtins should use safe array methods
        https://bugs.webkit.org/show_bug.cgi?id=151501

        Reviewed by Darin Adler.

        Adding @push and @shift to Array prototype.
        Using @push in TypedArray built-in.

        Covered by added test in LayoutTests/js/builtins

        * builtins/TypedArray.prototype.js:
        (filter):
        * runtime/ArrayPrototype.cpp:
        (JSC::ArrayPrototype::finishCreation):
        * runtime/CommonIdentifiers.h:

2015-12-08  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should have basic GetById support
        https://bugs.webkit.org/show_bug.cgi?id=152035

        Reviewed by Saam Barati.

        Adds basic GetById support. This was so easy to do. Unlike the LLVM code for this, the B3 code is
        entirely self-contained within the getById() method in LowerDFG.

        I discovered that we weren't folding Check(NotEqual(x, 0)) to Check(x). This was preventing us
        from generating good code for Check(NotEqual(BitAnd(x, tagMask), 0)), since the BitAnd was
        concealed. This was an easy strength reduction rule to add.

        Finally, I found it easier to say append(value, rep) than append(ConstrainedValue(value, rep)), so
        I added that API. The old ConstrainedValue form is still super useful in other places, like
        compileCallOrConstruct(), where the two-argument form would be awkward. It's great to have both
        APIs to pick from.

        * b3/B3ReduceStrength.cpp:
        * b3/B3StackmapValue.cpp:
        (JSC::B3::StackmapValue::~StackmapValue):
        (JSC::B3::StackmapValue::append):
        * b3/B3StackmapValue.h:
        * dfg/DFGCommon.h:
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::getById):

2015-12-09  Saam barati  <sbarati@apple.com>

        Update generators' features.json to indicate that we have a spec compliant implementation
        https://bugs.webkit.org/show_bug.cgi?id=152085

        Reviewed by Joseph Pecoraro.

        * features.json:

2015-12-09  Saam barati  <sbarati@apple.com>

        Update features.json w.r.t tail calls
        https://bugs.webkit.org/show_bug.cgi?id=152072

        Reviewed by Michael Saboff.

        * features.json:

2015-12-09  Saam barati  <sbarati@apple.com>

        we should emit op_watchdog after op_enter
        https://bugs.webkit.org/show_bug.cgi?id=151972

        Reviewed by Mark Lam.

        This also solves the issue of watchdog not being
        observed when we loop purely through tail calls.

        * API/tests/ExecutionTimeLimitTest.cpp:
        (testExecutionTimeLimit):
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::BytecodeGenerator):
        (JSC::BytecodeGenerator::emitProfiledOpcode):
        (JSC::BytecodeGenerator::emitEnter):
        (JSC::BytecodeGenerator::emitLoopHint):
        * bytecompiler/BytecodeGenerator.h:

2015-12-08  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Improve how B3 lowers Add() and Sub() on x86
        https://bugs.webkit.org/show_bug.cgi?id=152026

        Reviewed by Geoffrey Garen.

        The assembler was missing some important x86 forms of
        ADD and SUB that were making our lowering
        unfriendly with register allocation.

        First, we were missing a 3 operand version of Add
        implement with LEA. As a result, an Add would
        be lowered as:
            Move op1->srcDest
            Add op2, srcDest
        The problem with such code is that op2 and srcDest
        interferes. It is impossible to assign them the same
        machine register.

        With the new Add form, we have:
            Add op1, op2, dest
        without interferences between any of those values.
        The add is implement by a LEA without scaling or displacement.

        This patch also adds missing forms of Add and Sub with
        direct addressing for arguments. This avoids dealing with Tmps
        that only exist for those operations.

        Finally, the lowering of adding something to itself was updated accordingly.
        Such operation is transformed in Shl by 2. The lowering of Shl
        was adding an explicit Move, preventing the use of LEA when it
        is useful.
        Instead of having an explicit move, I changed the direct addressing
        forms to only be selected if the two operands are different.
        A Move is then added by appendBinOp() if needed.

        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::add32):
        (JSC::MacroAssemblerX86Common::x86Lea32):
        * assembler/MacroAssemblerX86_64.h:
        (JSC::MacroAssemblerX86_64::add64):
        (JSC::MacroAssemblerX86_64::x86Lea64):
        (JSC::MacroAssemblerX86_64::sub64):
        * assembler/X86Assembler.h:
        (JSC::X86Assembler::addq_rm):
        (JSC::X86Assembler::subq_mr):
        (JSC::X86Assembler::subq_rm):
        (JSC::X86Assembler::subq_im):
        (JSC::X86Assembler::leal_mr):
        (JSC::X86Assembler::leaq_mr):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::appendBinOp):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/air/AirOpcode.opcodes:
        * b3/testb3.cpp:
        (JSC::B3::testAddArgMem):
        (JSC::B3::testAddMemArg):
        (JSC::B3::testAddImmMem):
        (JSC::B3::testAddArg32):
        (JSC::B3::testAddArgMem32):
        (JSC::B3::testAddMemArg32):
        (JSC::B3::testAddImmMem32):
        (JSC::B3::testSubArgMem):
        (JSC::B3::testSubMemArg):
        (JSC::B3::testSubImmMem):
        (JSC::B3::testSubMemImm):
        (JSC::B3::testSubMemArg32):
        (JSC::B3::testSubArgMem32):
        (JSC::B3::testSubImmMem32):
        (JSC::B3::testSubMemImm32):
        (JSC::B3::run):

2015-12-08  Mark Lam  <mark.lam@apple.com>

        Factoring out common DFG code for bitwise and shift operators.
        https://bugs.webkit.org/show_bug.cgi?id=152019

        Reviewed by Michael Saboff.

        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileBitwiseOp):
        (JSC::DFG::SpeculativeJIT::compileShiftOp):
        * dfg/DFGSpeculativeJIT.h:
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):

2015-12-08  Mark Lam  <mark.lam@apple.com>

        DFG and FTL should be resilient against cases where both snippet operands are constant.
        https://bugs.webkit.org/show_bug.cgi?id=152017

        Reviewed by Michael Saboff.

        The DFG front end may not always constant fold cases where both operands are
        constant.  As a result, the DFG and FTL back ends needs to be resilient against
        this when using snippet generators since the generators do not support the case
        where both operands are constant.  The strategy for handling this 2 const operands
        case is to treat at least one of them as a variable if both are constant. 

        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileValueAdd):
        - Also remove the case for folding 2 constant operands.  It is the front end's
          job to do so, not the back end here.

        (JSC::DFG::SpeculativeJIT::compileArithSub):
        (JSC::DFG::SpeculativeJIT::compileArithMul):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileValueAdd):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithMul):

2015-12-08  Mark Lam  <mark.lam@apple.com>

        Snippefy shift operators for the baseline JIT.
        https://bugs.webkit.org/show_bug.cgi?id=151875

        Reviewed by Geoffrey Garen.

        * CMakeLists.txt:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * jit/JIT.h:

        * jit/JITArithmetic.cpp:
        (JSC::JIT::emitBitBinaryOpFastPath):
        - Don't need GPRInfo:: qualifiers.  Removed them to reduce verbosity.
        - Also removed the emitStoreInt32() case for storing the result on 32-bit ports.
          This is because:
          1. The client should not make assumptions about whether the snippet fast path
             only include cases where the result tag already contain the IntTag.
          2. The "(op1 == result || op2 == result)" condition for skipping the IntTag
             storage, is only valid for the bitand, bitor, and bitxor implementations.
             It is invalid for the lshift implementation that uses this code now.
          Instead, we'll always unconditionally store what the result tag that the
          snippet computed for us.

        (JSC::JIT::emit_op_lshift):
        (JSC::JIT::emitSlow_op_lshift):
        (JSC::JIT::emitRightShiftFastPath):
        (JSC::JIT::emit_op_rshift):
        (JSC::JIT::emitSlow_op_rshift):
        (JSC::JIT::emit_op_urshift):
        (JSC::JIT::emitSlow_op_urshift):

        * jit/JITArithmetic32_64.cpp:
        (JSC::JIT::emit_op_lshift): Deleted.
        (JSC::JIT::emitSlow_op_lshift): Deleted.
        (JSC::JIT::emitRightShift): Deleted.
        (JSC::JIT::emitRightShiftSlowCase): Deleted.
        (JSC::JIT::emit_op_rshift): Deleted.
        (JSC::JIT::emitSlow_op_rshift): Deleted.
        (JSC::JIT::emit_op_urshift): Deleted.
        (JSC::JIT::emitSlow_op_urshift): Deleted.

        * jit/JITLeftShiftGenerator.cpp: Added.
        (JSC::JITLeftShiftGenerator::generateFastPath):
        * jit/JITLeftShiftGenerator.h: Added.
        (JSC::JITLeftShiftGenerator::JITLeftShiftGenerator):
        * jit/JITRightShiftGenerator.cpp: Added.
        (JSC::JITRightShiftGenerator::generateFastPath):
        * jit/JITRightShiftGenerator.h: Added.
        (JSC::JITRightShiftGenerator::JITRightShiftGenerator):

        * tests/stress/op_lshift.js:
        * tests/stress/op_rshift.js:
        * tests/stress/op_urshift.js:
        - Fixed some values and added others that are meaningful for testing shifts.

        * tests/stress/resources/binary-op-test.js:
        (stringifyIfNeeded):
        (generateBinaryTests):
        - Fixed the test generator to give unique names to all the generated test
          functions.  Without this, multiple tests may end up using the same global
          test function.  As a result, with enough test values to test, the function may
          get prematurely JITted, and the computed expected result which is supposed to
          be computed by the LLINT, may end up being computed by a JIT instead.

2015-12-08  Joseph Pecoraro  <pecoraro@apple.com>

        Create a Sandbox SPI header
        https://bugs.webkit.org/show_bug.cgi?id=151981

        Reviewed by Andy Estes.

        * inspector/remote/RemoteInspector.mm:

2015-12-08  Filip Pizlo  <fpizlo@apple.com>

        DFG::UnificationPhase should merge isProfitableToUnbox, since this may have been set in ByteCodeParser
        https://bugs.webkit.org/show_bug.cgi?id=152011
        rdar://problem/23777875

        Reviewed by Michael Saboff.

        Previously UnificationPhase did not merge this because we used to only set this in FixupPhase, which runs after unification. But now
        ByteCodeParser may set isProfitableToUnbox as part of how it handles the ArgumentCount of an inlined varargs call, so UnificationPhase
        needs to merge it after unifying.

        Also changed the order of unification since this makes the bug more obvious and easier to test.

        * dfg/DFGUnificationPhase.cpp:
        (JSC::DFG::UnificationPhase::run):
        * tests/stress/varargs-with-unused-count.js: Added.

2015-12-08  Mark Lam  <mark.lam@apple.com>

        Polymorphic operand types for DFG and FTL div.
        https://bugs.webkit.org/show_bug.cgi?id=151747

        Reviewed by Geoffrey Garen.

        Perf on benchmarks is neutral.  The new JSRegress ftl-object-div test shows
        a speed up not from the div operator itself, but from the fact that the
        polymorphic operand types support now allow the test function to run without OSR
        exiting, thereby realizing the DFG and FTL's speed up on other work that the test
        function does.

        This patch has passed the layout tests on x86_64 with a debug build.
        It passed the JSC tests with x86 and x86_64 debug builds.

        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGOperations.cpp:
        * dfg/DFGOperations.h:
        * dfg/DFGPredictionPropagationPhase.cpp:
        (JSC::DFG::PredictionPropagationPhase::propagate):

        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileArithDiv):

        * ftl/FTLCompileBinaryOp.cpp:
        (JSC::FTL::generateBinaryArithOpFastPath):
        (JSC::FTL::generateBinaryOpFastPath):

        * ftl/FTLInlineCacheDescriptor.h:
        * ftl/FTLInlineCacheDescriptorInlines.h:
        (JSC::FTL::ArithDivDescriptor::ArithDivDescriptor):
        (JSC::FTL::ArithDivDescriptor::icSize):

        * ftl/FTLInlineCacheSize.cpp:
        (JSC::FTL::sizeOfArithDiv):
        * ftl/FTLInlineCacheSize.h:

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::lower):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithMul):
        - Fixed a cut-paste bug where the op_mul IC was using the op_sub IC size.
          This bug is benign because the op_sub IC size turns out to be larger
          than op_mul needs.
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithDiv):

        * jit/JITArithmetic.cpp:
        (JSC::JIT::emit_op_div):
        - Fixed a bug where the scratchFPR was not allocated for the 64bit port.
          This bug is benign because the scratchFPR is only needed if we are
          using scratchGPR register (used for branchConvertDoubleToInt32()) is
          >= X86Registers::r8.  Since we're always using regT2 for the scratchT2,
          the scratchFPR is never needed.   However, we should fix this anyway to
          be correct.

        * tests/stress/op_div.js:
        - Fixed some test values.

2015-12-05 Aleksandr Skachkov   <gskachkov@gmail.com>

        [ES6] "super" and "this" should be lexically bound inside an arrow function and should live in a JSLexicalEnvironment
        https://bugs.webkit.org/show_bug.cgi?id=149338

        Reviewed by Saam Barati.

        Implemented new version of the lexically bound 'this' in arrow function. In current version 
        'this' is stored inside of the lexical environment of the function. To store and load we use
        op_get_from_scope and op_put_to_scope operations. Also new implementation prevent raising TDZ
        error for arrow functions that are declared before super() but invoke after.

        * builtins/BuiltinExecutables.cpp:
        (JSC::createExecutableInternal):
        * bytecode/BytecodeList.json:
        * bytecode/BytecodeUseDef.h:
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::dumpBytecode):
        * bytecode/EvalCodeCache.h:
        (JSC::EvalCodeCache::getSlow):
        * bytecode/ExecutableInfo.h:
        (JSC::ExecutableInfo::ExecutableInfo):
        (JSC::ExecutableInfo::isDerivedConstructorContext):
        (JSC::ExecutableInfo::isArrowFunctionContext):
        * bytecode/UnlinkedCodeBlock.cpp:
        (JSC::UnlinkedCodeBlock::UnlinkedCodeBlock):
        * bytecode/UnlinkedCodeBlock.h:
        (JSC::UnlinkedCodeBlock::isArrowFunction):
        (JSC::UnlinkedCodeBlock::isDerivedConstructorContext):
        (JSC::UnlinkedCodeBlock::isArrowFunctionContext):
        * bytecode/UnlinkedFunctionExecutable.cpp:
        (JSC::generateUnlinkedFunctionCodeBlock):
        (JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
        * bytecode/UnlinkedFunctionExecutable.h:
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::BytecodeGenerator):
        (JSC::BytecodeGenerator::initializeArrowFunctionContextScopeIfNeeded):
        (JSC::BytecodeGenerator::variable):
        (JSC::BytecodeGenerator::emitNewArrowFunctionExpression):
        (JSC::BytecodeGenerator::emitLoadArrowFunctionLexicalEnvironment):
        (JSC::BytecodeGenerator::emitLoadThisFromArrowFunctionLexicalEnvironment):
        (JSC::BytecodeGenerator::emitLoadNewTargetFromArrowFunctionLexicalEnvironment):
        (JSC::BytecodeGenerator::emitLoadDerivedConstructorFromArrowFunctionLexicalEnvironment):
        (JSC::BytecodeGenerator::emitPutNewTargetToArrowFunctionContextScope):
        (JSC::BytecodeGenerator::emitPutDerivedConstructorToArrowFunctionContextScope):
        (JSC::BytecodeGenerator::emitPutThisToArrowFunctionContextScope):
        * bytecompiler/BytecodeGenerator.h:
        (JSC::BytecodeGenerator::isDerivedConstructorContext):
        (JSC::BytecodeGenerator::usesArrowFunction):
        (JSC::BytecodeGenerator::needsToUpdateArrowFunctionContext):
        (JSC::BytecodeGenerator::usesEval):
        (JSC::BytecodeGenerator::usesThis):
        (JSC::BytecodeGenerator::newTarget):
        (JSC::BytecodeGenerator::makeFunction):
        * bytecompiler/NodesCodegen.cpp:
        (JSC::ThisNode::emitBytecode):
        (JSC::SuperNode::emitBytecode):
        (JSC::EvalFunctionCallNode::emitBytecode):
        (JSC::FunctionCallValueNode::emitBytecode):
        (JSC::FunctionNode::emitBytecode):
        * debugger/DebuggerCallFrame.cpp:
        (JSC::DebuggerCallFrame::evaluate):
        * dfg/DFGAbstractInterpreterInlines.h:
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::parseBlock):
        * dfg/DFGCapabilities.cpp:
        * dfg/DFGClobberize.h:
        * dfg/DFGDoesGC.cpp:
        * dfg/DFGFixupPhase.cpp:
        * dfg/DFGNodeType.h:
        * dfg/DFGObjectAllocationSinkingPhase.cpp:
        * dfg/DFGPredictionPropagationPhase.cpp:
        * dfg/DFGPromotedHeapLocation.cpp:
        * dfg/DFGPromotedHeapLocation.h:
        * dfg/DFGSafeToExecute.h:
        * dfg/DFGSpeculativeJIT.cpp:
        * dfg/DFGSpeculativeJIT.h:
        * dfg/DFGSpeculativeJIT32_64.cpp:
        * dfg/DFGSpeculativeJIT64.cpp:
        * ftl/FTLCapabilities.cpp:
        * ftl/FTLLowerDFGToLLVM.cpp:
        * ftl/FTLOperations.cpp:
        (JSC::FTL::operationMaterializeObjectInOSR):
        * interpreter/Interpreter.cpp:
        (JSC::eval):
        * jit/JIT.cpp:
        * jit/JIT.h:
        * jit/JITOpcodes.cpp:
        (JSC::JIT::emitNewFuncExprCommon):
        * jit/JITOpcodes32_64.cpp:
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
        * llint/LowLevelInterpreter.asm:
        * llint/LowLevelInterpreter32_64.asm:
        * llint/LowLevelInterpreter64.asm:
        * parser/ASTBuilder.h:
        (JSC::ASTBuilder::createArrowFunctionExpr):
        (JSC::ASTBuilder::usesArrowFunction):
        * parser/Nodes.h:
        (JSC::ScopeNode::usesArrowFunction):
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseFunctionInfo):
        * parser/ParserModes.h:
        * runtime/CodeCache.cpp:
        (JSC::CodeCache::getGlobalCodeBlock):
        (JSC::CodeCache::getProgramCodeBlock):
        (JSC::CodeCache::getEvalCodeBlock):
        (JSC::CodeCache::getModuleProgramCodeBlock):
        (JSC::CodeCache::getFunctionExecutableFromGlobalCode):
        * runtime/CodeCache.h:
        * runtime/CommonIdentifiers.h:
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/Executable.cpp:
        (JSC::ScriptExecutable::ScriptExecutable):
        (JSC::EvalExecutable::create):
        (JSC::EvalExecutable::EvalExecutable):
        (JSC::ProgramExecutable::ProgramExecutable):
        (JSC::ModuleProgramExecutable::ModuleProgramExecutable):
        (JSC::FunctionExecutable::FunctionExecutable):
        * runtime/Executable.h:
        (JSC::ScriptExecutable::isArrowFunctionContext):
        (JSC::ScriptExecutable::isDerivedConstructorContext):
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::createEvalCodeBlock):
        * runtime/JSGlobalObject.h:
        * runtime/JSGlobalObjectFunctions.cpp:
        (JSC::globalFuncEval):
        * tests/es6.yaml:
        * tests/stress/arrowfunction-activation-sink-osrexit.js:
        * tests/stress/arrowfunction-activation-sink.js:
        * tests/stress/arrowfunction-lexical-bind-newtarget.js: Added.
        * tests/stress/arrowfunction-lexical-bind-supercall-1.js: Added.
        * tests/stress/arrowfunction-lexical-bind-supercall-2.js: Added.
        * tests/stress/arrowfunction-lexical-bind-supercall-3.js: Added.
        * tests/stress/arrowfunction-lexical-bind-supercall-4.js: Added.
        * tests/stress/arrowfunction-lexical-bind-this-1.js:
        * tests/stress/arrowfunction-lexical-bind-this-7.js: Added.
        * tests/stress/arrowfunction-tdz-1.js: Added.
        * tests/stress/arrowfunction-tdz-2.js: Added.
        * tests/stress/arrowfunction-tdz-3.js: Added.
        * tests/stress/arrowfunction-tdz-4.js: Added.
        * tests/stress/arrowfunction-tdz.js: Removed.

2015-12-08  Csaba Osztrogonác  <ossy@webkit.org>

        Fix the !ENABLE(DFG_JIT) build after r193649
        https://bugs.webkit.org/show_bug.cgi?id=151985

        Reviewed by Saam Barati.

        * jit/JITOpcodes.cpp:
        (JSC::JIT::emitSlow_op_loop_hint):

2015-12-08  Alberto Garcia  <berto@igalia.com>

        Unreviewed. Remove unnecessary check for 0 in commitSize().

        Change suggested by Darin Adler in bug #130237.

        * interpreter/JSStack.cpp:
        (JSC::commitSize):

2015-12-08  Ryuan Choi  <ryuan.choi@navercorp.com>

        [EFL] Remove the flag to check timer state in IncrementalSweeper
        https://bugs.webkit.org/show_bug.cgi?id=151988

        Reviewed by Gyuyoung Kim.

        * heap/IncrementalSweeper.cpp:
        (JSC::IncrementalSweeper::scheduleTimer):
        (JSC::IncrementalSweeper::IncrementalSweeper):
        (JSC::IncrementalSweeper::cancelTimer):

2015-12-08  Philippe Normand  <pnormand@igalia.com>

        [Mac][GTK] Fix JSC FTL build
        https://bugs.webkit.org/show_bug.cgi?id=151915

        Reviewed by Csaba Osztrogonác.

        * CMakeLists.txt: Don't pass version-script option to ld on Darwin because this platform's linker
        doesn't support this option.

2015-12-08  Alberto Garcia  <berto@igalia.com>

        Unreviewed. Use pageSize() instead of getpagesize() after r193648

        * interpreter/JSStack.cpp:
        (JSC::commitSize):

2015-12-07  Filip Pizlo  <fpizlo@apple.com>

        Small style fixes in B3MoveConstants.cpp
        https://bugs.webkit.org/show_bug.cgi?id=151980

        Reviewed by Benjamin Poulain.

        * b3/B3MoveConstants.cpp:

2015-12-07  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] On x86, we should XOR registers instead of moving a zero immediate
        https://bugs.webkit.org/show_bug.cgi?id=151977

        Reviewed by Filip Pizlo.

        It is smaller and the frontend has special support
        for xor.

        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::move):
        (JSC::MacroAssemblerX86Common::signExtend32ToPtr):

2015-12-07  Benjamin Poulain  <bpoulain@apple.com>

        Fix a typo from r193683

        * ftl/FTLCommonValues.cpp:
        (JSC::FTL::CommonValues::CommonValues):

2015-12-07  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Add Float support to B3
        https://bugs.webkit.org/show_bug.cgi?id=151974

        Reviewed by Filip Pizlo.

        This patch adds comprehensive float support to B3.

        The new phase reduceDoubleToFloat() gives us a primitive
        version of what LLVM was giving us on floats.
        It needs to support conversions accross Phis but that can
        be added later.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * assembler/MacroAssembler.h:
        (JSC::MacroAssembler::moveDoubleConditionallyFloat):
        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::sqrtFloat):
        (JSC::MacroAssemblerX86Common::loadFloat):
        (JSC::MacroAssemblerX86Common::storeFloat):
        (JSC::MacroAssemblerX86Common::convertDoubleToFloat):
        (JSC::MacroAssemblerX86Common::convertFloatToDouble):
        (JSC::MacroAssemblerX86Common::addFloat):
        (JSC::MacroAssemblerX86Common::divFloat):
        (JSC::MacroAssemblerX86Common::subFloat):
        (JSC::MacroAssemblerX86Common::mulFloat):
        (JSC::MacroAssemblerX86Common::branchDouble):
        (JSC::MacroAssemblerX86Common::branchFloat):
        (JSC::MacroAssemblerX86Common::moveConditionallyDouble):
        (JSC::MacroAssemblerX86Common::moveConditionallyFloat):
        (JSC::MacroAssemblerX86Common::jumpAfterFloatingPointCompare):
        (JSC::MacroAssemblerX86Common::moveConditionallyAfterFloatingPointCompare):
        * assembler/X86Assembler.h:
        (JSC::X86Assembler::addss_rr):
        (JSC::X86Assembler::addss_mr):
        (JSC::X86Assembler::cvtsd2ss_mr):
        (JSC::X86Assembler::cvtss2sd_mr):
        (JSC::X86Assembler::movss_rm):
        (JSC::X86Assembler::movss_mr):
        (JSC::X86Assembler::mulss_rr):
        (JSC::X86Assembler::mulss_mr):
        (JSC::X86Assembler::subss_rr):
        (JSC::X86Assembler::subss_mr):
        (JSC::X86Assembler::ucomiss_rr):
        (JSC::X86Assembler::ucomiss_mr):
        (JSC::X86Assembler::divss_rr):
        (JSC::X86Assembler::divss_mr):
        (JSC::X86Assembler::sqrtss_rr):
        (JSC::X86Assembler::sqrtss_mr):
        * b3/B3Const32Value.cpp:
        (JSC::B3::Const32Value::bitwiseCastConstant):
        * b3/B3Const32Value.h:
        * b3/B3ConstDoubleValue.cpp:
        (JSC::B3::ConstDoubleValue::doubleToFloatConstant):
        (JSC::B3::ConstDoubleValue::sqrtConstant):
        * b3/B3ConstDoubleValue.h:
        * b3/B3ConstFloatValue.cpp: Added.
        (JSC::B3::ConstFloatValue::~ConstFloatValue):
        (JSC::B3::ConstFloatValue::negConstant):
        (JSC::B3::ConstFloatValue::addConstant):
        (JSC::B3::ConstFloatValue::subConstant):
        (JSC::B3::ConstFloatValue::mulConstant):
        (JSC::B3::ConstFloatValue::bitwiseCastConstant):
        (JSC::B3::ConstFloatValue::floatToDoubleConstant):
        (JSC::B3::ConstFloatValue::sqrtConstant):
        (JSC::B3::ConstFloatValue::divConstant):
        (JSC::B3::ConstFloatValue::equalConstant):
        (JSC::B3::ConstFloatValue::notEqualConstant):
        (JSC::B3::ConstFloatValue::lessThanConstant):
        (JSC::B3::ConstFloatValue::greaterThanConstant):
        (JSC::B3::ConstFloatValue::lessEqualConstant):
        (JSC::B3::ConstFloatValue::greaterEqualConstant):
        (JSC::B3::ConstFloatValue::dumpMeta):
        * b3/B3ConstFloatValue.h: Copied from Source/JavaScriptCore/b3/B3ConstDoubleValue.h.
        * b3/B3Generate.cpp:
        (JSC::B3::generateToAir):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::tryOpcodeForType):
        (JSC::B3::Air::LowerToAir::opcodeForType):
        (JSC::B3::Air::LowerToAir::appendUnOp):
        (JSC::B3::Air::LowerToAir::appendBinOp):
        (JSC::B3::Air::LowerToAir::appendShift):
        (JSC::B3::Air::LowerToAir::tryAppendStoreUnOp):
        (JSC::B3::Air::LowerToAir::tryAppendStoreBinOp):
        (JSC::B3::Air::LowerToAir::moveForType):
        (JSC::B3::Air::LowerToAir::relaxedMoveForType):
        (JSC::B3::Air::LowerToAir::createGenericCompare):
        (JSC::B3::Air::LowerToAir::createBranch):
        (JSC::B3::Air::LowerToAir::createCompare):
        (JSC::B3::Air::LowerToAir::createSelect):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3MemoryValue.cpp:
        (JSC::B3::MemoryValue::accessByteSize): Deleted.
        * b3/B3MemoryValue.h:
        * b3/B3MoveConstants.cpp:
        * b3/B3Opcode.cpp:
        (WTF::printInternal):
        * b3/B3Opcode.h:
        * b3/B3Procedure.cpp:
        (JSC::B3::Procedure::addIntConstant):
        * b3/B3ReduceDoubleToFloat.cpp: Added.
        (JSC::B3::reduceDoubleToFloat):
        * b3/B3ReduceDoubleToFloat.h: Copied from Source/JavaScriptCore/b3/B3Type.cpp.
        * b3/B3ReduceStrength.cpp:
        * b3/B3Type.cpp:
        (WTF::printInternal):
        * b3/B3Type.h:
        (JSC::B3::isFloat):
        (JSC::B3::sizeofType):
        * b3/B3Validate.cpp:
        * b3/B3Value.cpp:
        (JSC::B3::Value::doubleToFloatConstant):
        (JSC::B3::Value::floatToDoubleConstant):
        (JSC::B3::Value::sqrtConstant):
        (JSC::B3::Value::asTriState):
        (JSC::B3::Value::effects):
        (JSC::B3::Value::key):
        (JSC::B3::Value::checkOpcode):
        (JSC::B3::Value::typeFor):
        * b3/B3Value.h:
        * b3/B3ValueInlines.h:
        (JSC::B3::Value::isConstant):
        (JSC::B3::Value::hasFloat):
        (JSC::B3::Value::asFloat):
        (JSC::B3::Value::hasNumber):
        (JSC::B3::Value::isNegativeZero):
        (JSC::B3::Value::representableAs):
        (JSC::B3::Value::asNumber):
        * b3/B3ValueKey.cpp:
        (JSC::B3::ValueKey::materialize):
        * b3/B3ValueKey.h:
        (JSC::B3::ValueKey::ValueKey):
        (JSC::B3::ValueKey::floatValue):
        * b3/air/AirArg.h:
        (JSC::B3::Air::Arg::typeForB3Type):
        (JSC::B3::Air::Arg::widthForB3Type):
        * b3/air/AirFixPartialRegisterStalls.cpp:
        * b3/air/AirOpcode.opcodes:
        * b3/testb3.cpp:
        (JSC::B3::testAddArgFloat):
        (JSC::B3::testAddArgsFloat):
        (JSC::B3::testAddArgImmFloat):
        (JSC::B3::testAddImmArgFloat):
        (JSC::B3::testAddImmsFloat):
        (JSC::B3::testAddArgFloatWithUselessDoubleConversion):
        (JSC::B3::testAddArgsFloatWithUselessDoubleConversion):
        (JSC::B3::testAddArgsFloatWithEffectfulDoubleConversion):
        (JSC::B3::testMulArgFloat):
        (JSC::B3::testMulArgsFloat):
        (JSC::B3::testMulArgImmFloat):
        (JSC::B3::testMulImmArgFloat):
        (JSC::B3::testMulImmsFloat):
        (JSC::B3::testMulArgFloatWithUselessDoubleConversion):
        (JSC::B3::testMulArgsFloatWithUselessDoubleConversion):
        (JSC::B3::testMulArgsFloatWithEffectfulDoubleConversion):
        (JSC::B3::testDivArgFloat):
        (JSC::B3::testDivArgsFloat):
        (JSC::B3::testDivArgImmFloat):
        (JSC::B3::testDivImmArgFloat):
        (JSC::B3::testDivImmsFloat):
        (JSC::B3::testDivArgFloatWithUselessDoubleConversion):
        (JSC::B3::testDivArgsFloatWithUselessDoubleConversion):
        (JSC::B3::testDivArgsFloatWithEffectfulDoubleConversion):
        (JSC::B3::testSubArgFloat):
        (JSC::B3::testSubArgsFloat):
        (JSC::B3::testSubArgImmFloat):
        (JSC::B3::testSubImmArgFloat):
        (JSC::B3::testSubImmsFloat):
        (JSC::B3::testSubArgFloatWithUselessDoubleConversion):
        (JSC::B3::testSubArgsFloatWithUselessDoubleConversion):
        (JSC::B3::testSubArgsFloatWithEffectfulDoubleConversion):
        (JSC::B3::testClzMem32):
        (JSC::B3::testSqrtArg):
        (JSC::B3::testSqrtImm):
        (JSC::B3::testSqrtMem):
        (JSC::B3::testSqrtArgWithUselessDoubleConversion):
        (JSC::B3::testSqrtArgWithEffectfulDoubleConversion):
        (JSC::B3::testDoubleArgToInt64BitwiseCast):
        (JSC::B3::testDoubleImmToInt64BitwiseCast):
        (JSC::B3::testTwoBitwiseCastOnDouble):
        (JSC::B3::testBitwiseCastOnDoubleInMemory):
        (JSC::B3::testInt64BArgToDoubleBitwiseCast):
        (JSC::B3::testInt64BImmToDoubleBitwiseCast):
        (JSC::B3::testTwoBitwiseCastOnInt64):
        (JSC::B3::testBitwiseCastOnInt64InMemory):
        (JSC::B3::testFloatImmToInt32BitwiseCast):
        (JSC::B3::testBitwiseCastOnFloatInMemory):
        (JSC::B3::testInt32BArgToFloatBitwiseCast):
        (JSC::B3::testInt32BImmToFloatBitwiseCast):
        (JSC::B3::testTwoBitwiseCastOnInt32):
        (JSC::B3::testBitwiseCastOnInt32InMemory):
        (JSC::B3::testConvertDoubleToFloatArg):
        (JSC::B3::testConvertDoubleToFloatImm):
        (JSC::B3::testConvertDoubleToFloatMem):
        (JSC::B3::testConvertFloatToDoubleArg):
        (JSC::B3::testConvertFloatToDoubleImm):
        (JSC::B3::testConvertFloatToDoubleMem):
        (JSC::B3::testConvertDoubleToFloatToDoubleToFloat):
        (JSC::B3::testLoadFloatConvertDoubleConvertFloatStoreFloat):
        (JSC::B3::testFroundArg):
        (JSC::B3::testFroundMem):
        (JSC::B3::testStore32):
        (JSC::B3::modelLoad):
        (JSC::B3::float>):
        (JSC::B3::double>):
        (JSC::B3::testLoad):
        (JSC::B3::testStoreFloat):
        (JSC::B3::testReturnFloat):
        (JSC::B3::simpleFunctionFloat):
        (JSC::B3::testCallSimpleFloat):
        (JSC::B3::functionWithHellaFloatArguments):
        (JSC::B3::testCallFunctionWithHellaFloatArguments):
        (JSC::B3::testSelectCompareFloat):
        (JSC::B3::testSelectCompareFloatToDouble):
        (JSC::B3::testSelectDoubleCompareFloat):
        (JSC::B3::testSelectFloatCompareFloat):
        (JSC::B3::populateWithInterestingValues):
        (JSC::B3::floatingPointOperands):
        (JSC::B3::int64Operands):
        (JSC::B3::run):
        (JSC::B3::testStore): Deleted.
        (JSC::B3::posInfinity): Deleted.
        (JSC::B3::negInfinity): Deleted.
        (JSC::B3::doubleOperands): Deleted.
        * ftl/FTLB3Output.cpp:
        (JSC::FTL::Output::loadFloatToDouble):
        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::fround):
        * ftl/FTLCommonValues.cpp:
        (JSC::FTL::CommonValues::CommonValues):
        * ftl/FTLCommonValues.h:

2015-12-07  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should be able to flag the tag constants as being super important so that B3 can hoist them and Air can force them into registers
        https://bugs.webkit.org/show_bug.cgi?id=151955

        Reviewed by Geoffrey Garen.

        Taught B3 about the concept of "fast constants". A client of B3 can now tell B3 which
        constants are super important. B3 will not spill the constant in that case and will ensure
        that the constant is materialized only once: statically once, and dynamically once per
        procedure execution. The hoistFastConstants() algorithm in B3MoveConstants.cpp achieves this
        by first picking the lowest common dominator of all uses of each fast constant, and then
        picking the materialization point by finding the lowest dominator of that dominator that is
        tied for lowest block frequency. In practice, the second step ensures that this is the lowest
        point in the program that is not in a loop (i.e. executes no more than once dynamically per
        procedure invocation).

        Taught Air about the concept of "fast tmps". B3 tells Air that a tmp is fast if it is used to
        hold the materialization of a fast constant. IRC will use the lowest possible spill score for
        fast tmps. In practice, this ensures that fast constants are never spilled.

        Added a small snippet of code to FTL::LowerDFGToLLVM that makes both of the tag constants
        into fast constants.

        My hope is that this very brute-force heuristic is good enough that we don't have to think
        about constants for a while. Based on my experience with how LLVM's constant hoisting works
        out, the heuristic in this patch is going to be tough to beat. LLVM's constant hoisting does
        good things when it hoists the tags, and usually causes nothing but problems when it hoists
        anything else. This is because there is no way a low-level compiler to really understand how
        a constant materialization impacts some operation's contribution to the overall execution
        time of a procedure. But, in the FTL we know that constant materializations for type checks
        are a bummer because we are super comfortable placing type checks on the hottest of paths. So
        those are the last paths where extra instructions should be added by the compiler. On the
        other hand, all other large constant uses are on relatively cold paths, or paths that are
        already expensive for other reasons. For example, global variable accesses have to
        materialize a pointer to the global. But that's not really a big deal, since a load from a
        global involves first the load itself and then type checks on the result - so probably the
        constant materialization is just not interesting. A store to a global often involves a store
        barrier, so the constant materialization is really not interesting. This patch codifies this
        heuristic in a pact between Air, B3, and the FTL: FTL demands that B3 pin the two tags in
        registers, and B3 relays the demand to Air.

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/B3CFG.h: Added.
        (JSC::B3::CFG::CFG):
        (JSC::B3::CFG::root):
        (JSC::B3::CFG::newMap):
        (JSC::B3::CFG::successors):
        (JSC::B3::CFG::predecessors):
        (JSC::B3::CFG::index):
        (JSC::B3::CFG::node):
        (JSC::B3::CFG::numNodes):
        (JSC::B3::CFG::dump):
        * b3/B3Dominators.h: Added.
        (JSC::B3::Dominators::Dominators):
        * b3/B3IndexMap.h:
        (JSC::B3::IndexMap::resize):
        (JSC::B3::IndexMap::size):
        (JSC::B3::IndexMap::operator[]):
        * b3/B3LowerMacros.cpp:
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::tmp):
        * b3/B3MoveConstants.cpp:
        * b3/B3Opcode.h:
        (JSC::B3::constPtrOpcode):
        (JSC::B3::isConstant):
        * b3/B3Procedure.cpp:
        (JSC::B3::Procedure::Procedure):
        (JSC::B3::Procedure::resetReachability):
        (JSC::B3::Procedure::invalidateCFG):
        (JSC::B3::Procedure::dump):
        (JSC::B3::Procedure::deleteValue):
        (JSC::B3::Procedure::dominators):
        (JSC::B3::Procedure::addFastConstant):
        (JSC::B3::Procedure::isFastConstant):
        (JSC::B3::Procedure::addDataSection):
        * b3/B3Procedure.h:
        (JSC::B3::Procedure::size):
        (JSC::B3::Procedure::cfg):
        (JSC::B3::Procedure::setLastPhaseName):
        * b3/B3ReduceStrength.cpp:
        * b3/B3ValueInlines.h:
        (JSC::B3::Value::isConstant):
        (JSC::B3::Value::isInteger):
        * b3/B3ValueKey.h:
        (JSC::B3::ValueKey::canMaterialize):
        (JSC::B3::ValueKey::isConstant):
        * b3/air/AirCode.cpp:
        (JSC::B3::Air::Code::findNextBlock):
        (JSC::B3::Air::Code::addFastTmp):
        * b3/air/AirCode.h:
        (JSC::B3::Air::Code::specials):
        (JSC::B3::Air::Code::isFastTmp):
        (JSC::B3::Air::Code::setLastPhaseName):
        * b3/air/AirIteratedRegisterCoalescing.cpp:
        * dfg/DFGDominators.h:
        * dfg/DFGSSACalculator.cpp:
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::lower):

2015-12-07  Andy VanWagoner  <thetalecrafter@gmail.com>

        [INTL] Implement String.prototype.toLocaleUpperCase in ECMA-402
        https://bugs.webkit.org/show_bug.cgi?id=147609

        Reviewed by Benjamin Poulain.

        Refactor most of toLocaleLowerCase to static function used by both
        toLocaleUpperCase and toLocaleLowerCase.
        Add toLocaleUpperCase using icu u_strToUpper.

        * runtime/StringPrototype.cpp:
        (JSC::StringPrototype::finishCreation):
        (JSC::toLocaleCase):
        (JSC::stringProtoFuncToLocaleLowerCase):
        (JSC::stringProtoFuncToLocaleUpperCase):

2015-12-07  Michael Saboff  <msaboff@apple.com>

        CRASH: CodeBlock::setOptimizationThresholdBasedOnCompilationResult + 567
        https://bugs.webkit.org/show_bug.cgi?id=151892

        Reviewed by Geoffrey Garen.

        Reverted the change made in change set r193491.

        The updated change is to finish all concurrent compilations and install the resulting
        code blocks before we make any state changes due to debugger activity.  After all code
        blocks have been installed, we make the debugger state changes, including jettisoning
        all optimized code blocks.

        This means that we will discard the optimized code blocks we just installed,
        but we won't do that while on the install code block path.

        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::setOptimizationThresholdBasedOnCompilationResult): Reverted r193491.
        * debugger/Debugger.cpp:
        (JSC::Debugger::setSteppingMode):
        (JSC::Debugger::registerCodeBlock):
        (JSC::Debugger::toggleBreakpoint):
        (JSC::Debugger::clearBreakpoints):
        (JSC::Debugger::clearDebuggerRequests):
        Call Heap::completeAllDFGPlans() before updating code blocks for debugging changes.

        * heap/Heap.h: Made completeAllDFGPlans() public.

2015-12-07  Filip Pizlo  <fpizlo@apple.com>

        FTL lowering should tell B3 the right block frequencies
        https://bugs.webkit.org/show_bug.cgi?id=151531

        Reviewed by Geoffrey Garen.

        This glues together the DFG's view of basic block execution counts and B3's block frequencies.
        This further improves our performance on imaging-gaussian-blur. It appears to improve the steady
        state throughput by almost 4%.

        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::setFrequency):
        (JSC::FTL::Output::newBlock):
        (JSC::FTL::Output::insertNewBlocksBefore):
        (JSC::FTL::Output::callWithoutSideEffects):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::lower):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileBlock):
        * ftl/FTLOutput.h:
        (JSC::FTL::Output::setFrequency):
        (JSC::FTL::Output::insertNewBlocksBefore):

2015-12-07  Saam barati  <sbarati@apple.com>

        Update JSC feature list for rest parameters and generators
        https://bugs.webkit.org/show_bug.cgi?id=151740

        Reviewed by Joseph Pecoraro.

        * features.json:

2015-12-07  Filip Pizlo  <fpizlo@apple.com>

        DFG ASSERTION FAILED: m_plan.weakReferences.contains(structure).
        https://bugs.webkit.org/show_bug.cgi?id=151952

        Reviewed by Mark Lam.

        Fix a bug revealed by the new ftl-has-a-bad-time.js test. It turns out that our handling of
        structures reachable from the compiler wasn't accounting for having a bad time.

        * dfg/DFGStructureRegistrationPhase.cpp:
        (JSC::DFG::StructureRegistrationPhase::run):

2015-12-07  Saam barati  <sbarati@apple.com>

        Add op_watchdog opcode that is generated when VM has a watchdog
        https://bugs.webkit.org/show_bug.cgi?id=151954

        Reviewed by Mark Lam.

        This patch also makes watchdog a private member
        of VM and adds a getter function.

        * API/JSContextRef.cpp:
        (JSContextGroupClearExecutionTimeLimit):
        * bytecode/BytecodeList.json:
        * bytecode/BytecodeUseDef.h:
        (JSC::computeUsesForBytecodeOffset):
        (JSC::computeDefsForBytecodeOffset):
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::dumpBytecode):
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitLoopHint):
        (JSC::BytecodeGenerator::emitWatchdog):
        (JSC::BytecodeGenerator::retrieveLastBinaryOp):
        * bytecompiler/BytecodeGenerator.h:
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::parseBlock):
        * dfg/DFGCapabilities.cpp:
        (JSC::DFG::capabilityLevel):
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCheckWatchdogTimer):
        * jit/JIT.cpp:
        (JSC::JIT::privateCompileMainPass):
        (JSC::JIT::privateCompileSlowCases):
        * jit/JIT.h:
        * jit/JITOpcodes.cpp:
        (JSC::JIT::emit_op_loop_hint):
        (JSC::JIT::emitSlow_op_loop_hint):
        (JSC::JIT::emit_op_watchdog):
        (JSC::JIT::emitSlow_op_watchdog):
        (JSC::JIT::emit_op_new_regexp):
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
        * llint/LowLevelInterpreter.asm:
        * runtime/VM.cpp:
        (JSC::VM::ensureWatchdog):
        * runtime/VM.h:
        (JSC::VM::watchdog):
        * runtime/VMEntryScope.cpp:
        (JSC::VMEntryScope::VMEntryScope):
        (JSC::VMEntryScope::~VMEntryScope):
        * runtime/VMInlines.h:
        (JSC::VM::shouldTriggerTermination):

2015-12-07  Alberto Garcia  <berto@igalia.com>

        Crashes on PPC64 due to mprotect() on address not aligned to the page size
        https://bugs.webkit.org/show_bug.cgi?id=130237

        Reviewed by Mark Lam.

        Make sure that commitSize is at least as big as the page size.

        * interpreter/JSStack.cpp:
        (JSC::commitSize):
        (JSC::JSStack::JSStack):
        (JSC::JSStack::growSlowCase):
        * interpreter/JSStack.h:

2015-12-06  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should be able to make JS->JS calls
        https://bugs.webkit.org/show_bug.cgi?id=151901

        Reviewed by Saam Barati.

        This adds support for the Call and InvalidationPoint opcodes in DFG IR. This required doing some
        clean-up in the OSR exit code. We don't want the B3 FTL to use a bunch of vectors to hold
        side-state, so the use of OSRExitDescriptorImpl is not right. It makes sense in the LLVM FTL
        because that code needs some way of saving some state from LowerDFGToLLVM to compile(), but
        that's not how B3 FTL works. It turns out that for B3 FTL, there isn't anything in
        OSRExitDescriptorImpl that the code in LowerDFGToLLVM can't just capture in a lambda.

        This also simplifies some stackmap-related APIs, since I got tired of writing boilerplate.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * assembler/AbstractMacroAssembler.h:
        (JSC::AbstractMacroAssembler::replaceWithAddressComputation):
        (JSC::AbstractMacroAssembler::addLinkTask):
        * b3/B3CheckSpecial.cpp:
        (JSC::B3::CheckSpecial::generate):
        * b3/B3Effects.h:
        * b3/B3PatchpointSpecial.cpp:
        (JSC::B3::PatchpointSpecial::generate):
        * b3/B3Procedure.cpp:
        (JSC::B3::Procedure::addDataSection):
        (JSC::B3::Procedure::callArgAreaSize):
        (JSC::B3::Procedure::requestCallArgAreaSize):
        (JSC::B3::Procedure::frameSize):
        * b3/B3Procedure.h:
        (JSC::B3::Procedure::releaseByproducts):
        (JSC::B3::Procedure::code):
        * b3/B3StackmapGenerationParams.cpp: Added.
        (JSC::B3::StackmapGenerationParams::usedRegisters):
        (JSC::B3::StackmapGenerationParams::proc):
        (JSC::B3::StackmapGenerationParams::StackmapGenerationParams):
        * b3/B3StackmapGenerationParams.h: Added.
        (JSC::B3::StackmapGenerationParams::value):
        (JSC::B3::StackmapGenerationParams::reps):
        (JSC::B3::StackmapGenerationParams::size):
        (JSC::B3::StackmapGenerationParams::at):
        (JSC::B3::StackmapGenerationParams::operator[]):
        (JSC::B3::StackmapGenerationParams::begin):
        (JSC::B3::StackmapGenerationParams::end):
        (JSC::B3::StackmapGenerationParams::context):
        (JSC::B3::StackmapGenerationParams::addLatePath):
        * b3/B3StackmapValue.h:
        * b3/B3ValueRep.h:
        (JSC::B3::ValueRep::doubleValue):
        (JSC::B3::ValueRep::withOffset):
        * b3/air/AirGenerationContext.h:
        * b3/testb3.cpp:
        (JSC::B3::testSimplePatchpoint):
        (JSC::B3::testSimplePatchpointWithoutOuputClobbersGPArgs):
        (JSC::B3::testSimplePatchpointWithOuputClobbersGPArgs):
        (JSC::B3::testSimplePatchpointWithoutOuputClobbersFPArgs):
        (JSC::B3::testSimplePatchpointWithOuputClobbersFPArgs):
        (JSC::B3::testPatchpointWithEarlyClobber):
        (JSC::B3::testPatchpointCallArg):
        (JSC::B3::testPatchpointFixedRegister):
        (JSC::B3::testPatchpointAny):
        (JSC::B3::testPatchpointLotsOfLateAnys):
        (JSC::B3::testPatchpointAnyImm):
        (JSC::B3::testPatchpointManyImms):
        (JSC::B3::testPatchpointWithRegisterResult):
        (JSC::B3::testPatchpointWithStackArgumentResult):
        (JSC::B3::testPatchpointWithAnyResult):
        (JSC::B3::testSimpleCheck):
        (JSC::B3::testCheckLessThan):
        (JSC::B3::testCheckMegaCombo):
        (JSC::B3::testCheckAddImm):
        (JSC::B3::testCheckAddImmCommute):
        (JSC::B3::testCheckAddImmSomeRegister):
        (JSC::B3::testCheckAdd):
        (JSC::B3::testCheckAdd64):
        (JSC::B3::testCheckSubImm):
        (JSC::B3::testCheckSubBadImm):
        (JSC::B3::testCheckSub):
        (JSC::B3::testCheckSub64):
        (JSC::B3::testCheckNeg):
        (JSC::B3::testCheckNeg64):
        (JSC::B3::testCheckMul):
        (JSC::B3::testCheckMulMemory):
        (JSC::B3::testCheckMul2):
        (JSC::B3::testCheckMul64):
        (JSC::B3::genericTestCompare):
        * ftl/FTLExceptionHandlerManager.cpp:
        * ftl/FTLExceptionHandlerManager.h:
        * ftl/FTLJSCall.cpp:
        * ftl/FTLJSCall.h:
        * ftl/FTLJSCallBase.cpp:
        (JSC::FTL::JSCallBase::emit):
        * ftl/FTLJSCallBase.h:
        * ftl/FTLJSCallVarargs.cpp:
        * ftl/FTLJSCallVarargs.h:
        * ftl/FTLJSTailCall.cpp:
        (JSC::FTL::DFG::getRegisterWithAddend):
        (JSC::FTL::JSTailCall::emit):
        (JSC::FTL::JSTailCall::JSTailCall): Deleted.
        * ftl/FTLJSTailCall.h:
        (JSC::FTL::JSTailCall::stackmapID):
        (JSC::FTL::JSTailCall::estimatedSize):
        (JSC::FTL::JSTailCall::operator<):
        (JSC::FTL::JSTailCall::patchpoint): Deleted.
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCallOrConstruct):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileInvalidationPoint):
        (JSC::FTL::DFG::LowerDFGToLLVM::lazySlowPath):
        (JSC::FTL::DFG::LowerDFGToLLVM::callCheck):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExitArgumentsForPatchpointIfWillCatchException):
        (JSC::FTL::DFG::LowerDFGToLLVM::emitBranchToOSRExitIfWillCatchException):
        (JSC::FTL::DFG::LowerDFGToLLVM::lowBlock):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExitDescriptor):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExit):
        (JSC::FTL::DFG::LowerDFGToLLVM::blessSpeculation):
        (JSC::FTL::DFG::LowerDFGToLLVM::emitOSRExitCall):
        (JSC::FTL::DFG::LowerDFGToLLVM::buildExitArguments):
        (JSC::FTL::DFG::LowerDFGToLLVM::exitValueForNode):
        * ftl/FTLOSRExit.cpp:
        (JSC::FTL::OSRExitDescriptor::OSRExitDescriptor):
        (JSC::FTL::OSRExitDescriptor::emitOSRExit):
        (JSC::FTL::OSRExitDescriptor::emitOSRExitLater):
        (JSC::FTL::OSRExitDescriptor::prepareOSRExitHandle):
        (JSC::FTL::OSRExit::OSRExit):
        (JSC::FTL::OSRExit::codeLocationForRepatch):
        (JSC::FTL::OSRExit::recoverRegistersFromSpillSlot):
        (JSC::FTL::OSRExit::willArriveAtExitFromIndirectExceptionCheck):
        (JSC::FTL::OSRExit::needsRegisterRecoveryOnGenericUnwindOSRExitPath):
        * ftl/FTLOSRExit.h:
        (JSC::FTL::OSRExitDescriptorImpl::OSRExitDescriptorImpl):
        (JSC::FTL::OSRExit::considerAddingAsFrequentExitSite):
        * ftl/FTLOSRExitCompiler.cpp:
        (JSC::FTL::compileStub):
        (JSC::FTL::compileFTLOSRExit):
        * ftl/FTLState.h:

2015-12-07  Saam barati  <sbarati@apple.com>

        Rename Watchdog::didFire to Watchdog::shouldTerminate because that's what didFire really meant
        https://bugs.webkit.org/show_bug.cgi?id=151944

        Reviewed by Mark Lam.

        * interpreter/Interpreter.cpp:
        (JSC::Interpreter::execute):
        * runtime/VMInlines.h:
        (JSC::VM::shouldTriggerTermination):
        * runtime/Watchdog.cpp:
        (JSC::Watchdog::terminateSoon):
        (JSC::Watchdog::shouldTerminateSlow):
        (JSC::Watchdog::didFireSlow): Deleted.
        * runtime/Watchdog.h:
        (JSC::Watchdog::shouldTerminate):
        (JSC::Watchdog::didFire): Deleted.

2015-12-07  Mark Lam  <mark.lam@apple.com>

        Rename JITBitwiseBinaryOpGenerator to JITBitBinaryOpGenerator.
        https://bugs.webkit.org/show_bug.cgi?id=151945

        Reviewed by Saam Barati.

        The lshift operator also need to inherit from JITBitBinaryOpGenerator.  Calling
        it "BitBinaryOp" makes more sense than "BitwiseBinaryOp" in that case, and still
        makes sense for the bitand, bitor, and bitxor operators.

        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * jit/JIT.h:
        * jit/JITArithmetic.cpp:
        (JSC::JIT::emitBitBinaryOpFastPath):
        (JSC::JIT::emit_op_bitand):
        (JSC::JIT::emitSlow_op_bitand):
        (JSC::JIT::emit_op_bitor):
        (JSC::JIT::emitSlow_op_bitor):
        (JSC::JIT::emit_op_bitxor):
        (JSC::JIT::emitSlow_op_bitxor):
        (JSC::JIT::emitBitwiseBinaryOpFastPath): Deleted.
        * jit/JITBitAndGenerator.h:
        (JSC::JITBitAndGenerator::JITBitAndGenerator):
        * jit/JITBitBinaryOpGenerator.h: Copied from Source/JavaScriptCore/jit/JITBitwiseBinaryOpGenerator.h.
        (JSC::JITBitBinaryOpGenerator::JITBitBinaryOpGenerator):
        (JSC::JITBitwiseBinaryOpGenerator::JITBitwiseBinaryOpGenerator): Deleted.
        * jit/JITBitOrGenerator.h:
        (JSC::JITBitOrGenerator::JITBitOrGenerator):
        * jit/JITBitXorGenerator.h:
        (JSC::JITBitXorGenerator::JITBitXorGenerator):
        * jit/JITBitwiseBinaryOpGenerator.h: Removed.

2015-12-07  Csaba Osztrogonác  <ossy@webkit.org>

        [B3] Typo fix after r193386 to fix the build
        https://bugs.webkit.org/show_bug.cgi?id=151860

        Reviewed by Filip Pizlo.

        * b3/B3StackmapSpecial.cpp:
        (JSC::B3::StackmapSpecial::isArgValidForValue):

2015-12-07  Gyuyoung Kim  <gyuyoung.kim@webkit.org>

        [EFL] Implement scheduleTimer and cancelTimer in IncrementalSweeper class
        https://bugs.webkit.org/show_bug.cgi?id=151656

        Reviewed by Csaba Osztrogonác.

        Support IncremntalSweeper using Ecore_Timer.

        * heap/IncrementalSweeper.cpp:
        (JSC::IncrementalSweeper::IncrementalSweeper):
        (JSC::IncrementalSweeper::scheduleTimer):
        (JSC::IncrementalSweeper::cancelTimer):
        * heap/IncrementalSweeper.h:

2015-12-06  Andy VanWagoner  <thetalecrafter@gmail.com>

        [INTL] Implement String.prototype.toLocaleLowerCase in ECMA-402
        https://bugs.webkit.org/show_bug.cgi?id=147608

        Reviewed by Benjamin Poulain.

        Add toLocaleLowerCase using icu u_strToLower.

        * runtime/IntlObject.cpp:
        (JSC::defaultLocale): Expose.
        (JSC::bestAvailableLocale): Expose.
        (JSC::removeUnicodeLocaleExtension): Expose.
        * runtime/IntlObject.h:
        * runtime/StringPrototype.cpp:
        (JSC::StringPrototype::finishCreation):
        (JSC::stringProtoFuncToLocaleLowerCase): Add.

2015-12-06  David Kilzer  <ddkilzer@apple.com>

        REGRESSION(r193584): Causes heap use-after-free crashes in Web Inspector tests with AddressSanitizer (Requested by ddkilzer on #webkit).
        https://bugs.webkit.org/show_bug.cgi?id=151929

        Reverted changeset:

        "[ES6] "super" and "this" should be lexically bound inside an
        arrow function and should live in a JSLexicalEnvironment"
        https://bugs.webkit.org/show_bug.cgi?id=149338
        http://trac.webkit.org/changeset/193584

2015-12-06  Skachkov Oleksandr  <gskachkov@gmail.com>

        [es6] Arrow function syntax. Fix tests after 149338 landing
        https://bugs.webkit.org/show_bug.cgi?id=151927

        Reviewed by Saam Barati.

        After landing patch for 149338 errors appear in for ES6 Generator. Current fix is removed assert 
        that was removed by patch with implemenation of ES6 Generator.
 
        * runtime/CommonSlowPaths.cpp:

2015-12-05 Aleksandr Skachkov   <gskachkov@gmail.com>

        [ES6] "super" and "this" should be lexically bound inside an arrow function and should live in a JSLexicalEnvironment
        https://bugs.webkit.org/show_bug.cgi?id=149338

        Reviewed by Saam Barati.

        Implemented new version of the lexically bound 'this' in arrow function. In current version 
        'this' is stored inside of the lexical environment of the function. To store and load we use
        op_get_from_scope and op_put_to_scope operations. Also new implementation prevent raising TDZ
        error for arrow functions that are declared before super() but invoke after.

        * builtins/BuiltinExecutables.cpp:
        (JSC::createExecutableInternal):
        * bytecode/BytecodeList.json:
        * bytecode/BytecodeUseDef.h:
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::dumpBytecode):
        * bytecode/EvalCodeCache.h:
        (JSC::EvalCodeCache::getSlow):
        * bytecode/ExecutableInfo.h:
        (JSC::ExecutableInfo::ExecutableInfo):
        (JSC::ExecutableInfo::isDerivedConstructorContext):
        (JSC::ExecutableInfo::isArrowFunctionContext):
        * bytecode/UnlinkedCodeBlock.cpp:
        (JSC::UnlinkedCodeBlock::UnlinkedCodeBlock):
        * bytecode/UnlinkedCodeBlock.h:
        (JSC::UnlinkedCodeBlock::isArrowFunction):
        (JSC::UnlinkedCodeBlock::isDerivedConstructorContext):
        (JSC::UnlinkedCodeBlock::isArrowFunctionContext):
        * bytecode/UnlinkedFunctionExecutable.cpp:
        (JSC::generateUnlinkedFunctionCodeBlock):
        (JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
        * bytecode/UnlinkedFunctionExecutable.h:
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::BytecodeGenerator):
        (JSC::BytecodeGenerator::initializeArrowFunctionContextScopeIfNeeded):
        (JSC::BytecodeGenerator::variable):
        (JSC::BytecodeGenerator::emitNewArrowFunctionExpression):
        (JSC::BytecodeGenerator::emitLoadArrowFunctionLexicalEnvironment):
        (JSC::BytecodeGenerator::emitLoadThisFromArrowFunctionLexicalEnvironment):
        (JSC::BytecodeGenerator::emitLoadNewTargetFromArrowFunctionLexicalEnvironment):
        (JSC::BytecodeGenerator::emitLoadDerivedConstructorFromArrowFunctionLexicalEnvironment):
        (JSC::BytecodeGenerator::emitPutNewTargetToArrowFunctionContextScope):
        (JSC::BytecodeGenerator::emitPutDerivedConstructorToArrowFunctionContextScope):
        (JSC::BytecodeGenerator::emitPutThisToArrowFunctionContextScope):
        * bytecompiler/BytecodeGenerator.h:
        (JSC::BytecodeGenerator::isDerivedConstructorContext):
        (JSC::BytecodeGenerator::usesArrowFunction):
        (JSC::BytecodeGenerator::needsToUpdateArrowFunctionContext):
        (JSC::BytecodeGenerator::usesEval):
        (JSC::BytecodeGenerator::usesThis):
        (JSC::BytecodeGenerator::newTarget):
        (JSC::BytecodeGenerator::makeFunction):
        * bytecompiler/NodesCodegen.cpp:
        (JSC::ThisNode::emitBytecode):
        (JSC::SuperNode::emitBytecode):
        (JSC::EvalFunctionCallNode::emitBytecode):
        (JSC::FunctionCallValueNode::emitBytecode):
        (JSC::FunctionNode::emitBytecode):
        * debugger/DebuggerCallFrame.cpp:
        (JSC::DebuggerCallFrame::evaluate):
        * dfg/DFGAbstractInterpreterInlines.h:
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::parseBlock):
        * dfg/DFGCapabilities.cpp:
        * dfg/DFGClobberize.h:
        * dfg/DFGDoesGC.cpp:
        * dfg/DFGFixupPhase.cpp:
        * dfg/DFGNodeType.h:
        * dfg/DFGObjectAllocationSinkingPhase.cpp:
        * dfg/DFGPredictionPropagationPhase.cpp:
        * dfg/DFGPromotedHeapLocation.cpp:
        * dfg/DFGPromotedHeapLocation.h:
        * dfg/DFGSafeToExecute.h:
        * dfg/DFGSpeculativeJIT.cpp:
        * dfg/DFGSpeculativeJIT.h:
        * dfg/DFGSpeculativeJIT32_64.cpp:
        * dfg/DFGSpeculativeJIT64.cpp:
        * ftl/FTLCapabilities.cpp:
        * ftl/FTLLowerDFGToLLVM.cpp:
        * ftl/FTLOperations.cpp:
        (JSC::FTL::operationMaterializeObjectInOSR):
        * interpreter/Interpreter.cpp:
        (JSC::eval):
        * jit/JIT.cpp:
        * jit/JIT.h:
        * jit/JITOpcodes.cpp:
        (JSC::JIT::emitNewFuncExprCommon):
        * jit/JITOpcodes32_64.cpp:
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
        * llint/LowLevelInterpreter.asm:
        * llint/LowLevelInterpreter32_64.asm:
        * llint/LowLevelInterpreter64.asm:
        * parser/ASTBuilder.h:
        (JSC::ASTBuilder::createArrowFunctionExpr):
        (JSC::ASTBuilder::usesArrowFunction):
        * parser/Nodes.h:
        (JSC::ScopeNode::usesArrowFunction):
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseFunctionInfo):
        * parser/ParserModes.h:
        * runtime/CodeCache.cpp:
        (JSC::CodeCache::getGlobalCodeBlock):
        (JSC::CodeCache::getProgramCodeBlock):
        (JSC::CodeCache::getEvalCodeBlock):
        (JSC::CodeCache::getModuleProgramCodeBlock):
        (JSC::CodeCache::getFunctionExecutableFromGlobalCode):
        * runtime/CodeCache.h:
        * runtime/CommonIdentifiers.h:
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/Executable.cpp:
        (JSC::ScriptExecutable::ScriptExecutable):
        (JSC::EvalExecutable::create):
        (JSC::EvalExecutable::EvalExecutable):
        (JSC::ProgramExecutable::ProgramExecutable):
        (JSC::ModuleProgramExecutable::ModuleProgramExecutable):
        (JSC::FunctionExecutable::FunctionExecutable):
        * runtime/Executable.h:
        (JSC::ScriptExecutable::isArrowFunctionContext):
        (JSC::ScriptExecutable::isDerivedConstructorContext):
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::createEvalCodeBlock):
        * runtime/JSGlobalObject.h:
        * runtime/JSGlobalObjectFunctions.cpp:
        (JSC::globalFuncEval):
        * tests/es6.yaml:
        * tests/stress/arrowfunction-activation-sink-osrexit.js:
        * tests/stress/arrowfunction-activation-sink.js:
        * tests/stress/arrowfunction-lexical-bind-newtarget.js: Added.
        * tests/stress/arrowfunction-lexical-bind-supercall-1.js: Added.
        * tests/stress/arrowfunction-lexical-bind-supercall-2.js: Added.
        * tests/stress/arrowfunction-lexical-bind-supercall-3.js: Added.
        * tests/stress/arrowfunction-lexical-bind-supercall-4.js: Added.
        * tests/stress/arrowfunction-lexical-bind-this-1.js:
        * tests/stress/arrowfunction-lexical-bind-this-7.js: Added.
        * tests/stress/arrowfunction-tdz-1.js: Added.
        * tests/stress/arrowfunction-tdz-2.js: Added.
        * tests/stress/arrowfunction-tdz-3.js: Added.
        * tests/stress/arrowfunction-tdz-4.js: Added.
        * tests/stress/arrowfunction-tdz.js: Removed.

2015-12-05  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Remove FTLOutput's fence support
        https://bugs.webkit.org/show_bug.cgi?id=151909

        Reviewed by Sam Weinig.

        Unused code is unused.

        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::fence): Deleted.
        (JSC::FTL::Output::fenceAcqRel): Deleted.
        * ftl/FTLOutput.h:
        (JSC::FTL::Output::fence): Deleted.
        (JSC::FTL::Output::fenceAcqRel): Deleted.

2015-12-04  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Some more cleanup of FTLB3Output
        https://bugs.webkit.org/show_bug.cgi?id=151834

        Reviewed by Filip Pizlo.

        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::trap):
        (JSC::FTL::Output::stackmapIntrinsic): Deleted.
        (JSC::FTL::Output::frameAddressIntrinsic): Deleted.
        (JSC::FTL::Output::patchpointInt64Intrinsic): Deleted.
        (JSC::FTL::Output::patchpointVoidIntrinsic): Deleted.
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::probe):

2015-12-04  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Fix Value::returnsBool() after r193436
        https://bugs.webkit.org/show_bug.cgi?id=151902

        Reviewed by Saam Barati.

        I forgot to carry a test from Branch and Select :(

        * b3/B3Value.cpp:
        (JSC::B3::Value::returnsBool):

2015-12-04  Andy VanWagoner  <thetalecrafter@gmail.com>

        [INTL] Implement Number.prototype.toLocaleString in ECMA-402
        https://bugs.webkit.org/show_bug.cgi?id=147610

        Reviewed by Benjamin Poulain.

        Add toLocaleString in builtin JavaScript that delegates formatting to Intl.NumberFormat.
        Keep exisiting native implementation for use if INTL flag is disabled.

        * CMakeLists.txt: Add NumberPrototype.js.
        * DerivedSources.make: Add NumberPrototype.js.
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * builtins/NumberPrototype.js: Added.
        (toLocaleString):
        * runtime/CommonIdentifiers.h: Add private names for Intl constructors.
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init): Expose Intl constructors to builtin js.
        * runtime/NumberPrototype.cpp:
        (JSC::NumberPrototype::finishCreation): Replace toLocaleString implementation.

2015-12-04  Michael Saboff  <msaboff@apple.com>

        CRASH: CodeBlock::setOptimizationThresholdBasedOnCompilationResult + 567
        https://bugs.webkit.org/show_bug.cgi?id=151892

        Reviewed by Mark Lam.

        When the debugger is in the process of attaching and it recompiles functions
        for debugging, there can also be a DFG compilation running concurrently.
        When we go to update the optimization threshold and find that the replacement
        is also baseline code, we shouldn't update the threshold.

        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::setOptimizationThresholdBasedOnCompilationResult):

2015-12-04  Jonathan Davis  <jond@apple.com>

        Update feature status for up-to-date status information.
        https://bugs.webkit.org/show_bug.cgi?id=151821

        Reviewed by Timothy Hatcher.

        * features.json:

2015-12-04  Saam barati  <sbarati@apple.com>

        OSR exits that are exception handlers should emit less code eagerly in the thunk generator, and instead, should defer as much code generation as possible to be lazily generated in the exit itself
        https://bugs.webkit.org/show_bug.cgi?id=151406

        Reviewed by Filip Pizlo.

        We no longer emit any extra code eagerly for an OSRExit that
        is an exception handler. We emit all code lazily in the exit
        itself. This has one interesting consequence which is that the
        actual C call to compile the exit goes through an OSR exit generation
        thunk that must now be aware of resetting the call frame and the stack
        pointer to their proper values before making the compileOSRExit C
        call. This has one interesting consequence in the FTL because the
        FTL will do a pushToSaveImmediateWithoutTouchingRegisters with the
        OSR exit index. We must take care to preserve this exit index when
        we reset the stack pointer by re-pushing it onto the stack.

        * bytecode/CodeBlock.h:
        (JSC::CodeBlock::setJITCode):
        (JSC::CodeBlock::jitCode):
        (JSC::CodeBlock::jitCodeOffset):
        (JSC::CodeBlock::jitType):
        * dfg/DFGCommonData.h:
        (JSC::DFG::CommonData::frameRegisterCountOffset):
        * dfg/DFGJITCode.h:
        (JSC::DFG::JITCode::setOSREntryBlock):
        (JSC::DFG::JITCode::clearOSREntryBlock):
        (JSC::DFG::JITCode::commonDataOffset):
        * dfg/DFGJITCompiler.cpp:
        (JSC::DFG::JITCompiler::linkOSRExits):
        * dfg/DFGOSRExitCompiler.cpp:
        * dfg/DFGOSRExitCompilerCommon.h:
        (JSC::DFG::adjustFrameAndStackInOSRExitCompilerThunk):
        * dfg/DFGThunks.cpp:
        (JSC::DFG::osrExitGenerationThunkGenerator):
        * ftl/FTLCompile.cpp:
        (JSC::FTL::mmAllocateDataSection):
        * ftl/FTLExitThunkGenerator.cpp:
        (JSC::FTL::ExitThunkGenerator::~ExitThunkGenerator):
        (JSC::FTL::ExitThunkGenerator::emitThunk):
        (JSC::FTL::ExitThunkGenerator::emitThunks):
        * ftl/FTLExitThunkGenerator.h:
        (JSC::FTL::ExitThunkGenerator::didThings):
        * ftl/FTLJITCode.h:
        (JSC::FTL::JITCode::commonDataOffset):
        * ftl/FTLOSRExitCompiler.cpp:
        (JSC::FTL::compileStub):
        (JSC::FTL::compileFTLOSRExit):
        * ftl/FTLThunks.cpp:
        (JSC::FTL::genericGenerationThunkGenerator):
        (JSC::FTL::osrExitGenerationThunkGenerator):
        (JSC::FTL::lazySlowPathGenerationThunkGenerator):
        (JSC::FTL::registerClobberCheck):

2015-12-04  Filip Pizlo  <fpizlo@apple.com>

        Having a bad time has a really awful time when it runs at the same time as the JIT
        https://bugs.webkit.org/show_bug.cgi?id=151882
        rdar://problem/23547038

        Unreviewed, really adding the test this time.

        * tests/stress/ftl-has-a-bad-time.js: Added.
        (foo):

2015-12-04  Mark Lam  <mark.lam@apple.com>

        Snippefy bitwise operators for the baseline JIT.
        https://bugs.webkit.org/show_bug.cgi?id=151680

        Reviewed by Geoffrey Garen.

        This patch has passed the JSC tests on x86 and x86_64.  It has also passed the
        layout tests on x86_64.

        With the DFG enabled, perf is neutral on x86_64 and x86.
        With the DFG disabled on x86_64, some AsmBench tests are showing progressions e.g.
            gcc-loops.cpp           1.0269x faster
            stepanov_container.cpp  1.0180x faster

        With the DFG disabled on x86, perf is neutral.

        * CMakeLists.txt:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
        * JavaScriptCore.xcodeproj/project.pbxproj:

        * jit/AssemblyHelpers.h:
        (JSC::AssemblyHelpers::moveValueRegs):
        (JSC::AssemblyHelpers::branchIfNotInt32):
        * jit/JIT.h:
        * jit/JITArithmetic.cpp:
        (JSC::JIT::emitBitwiseBinaryOpFastPath):
        - Template for the bitwise operations.
        (JSC::JIT::emit_op_bitand):
        (JSC::JIT::emit_op_bitor):
        (JSC::JIT::emit_op_bitxor):
        - Specializes emitBitwiseBinaryOpFastPath() with the respective snippet generators.
        (JSC::JIT::emitSlow_op_bitand):
        (JSC::JIT::emitSlow_op_bitor):
        (JSC::JIT::emitSlow_op_bitxor):
        - Implement respective slow paths.

        * jit/JITArithmetic32_64.cpp:
        (JSC::JIT::emit_op_bitand): Deleted.
        (JSC::JIT::emitSlow_op_bitand): Deleted.
        (JSC::JIT::emit_op_bitor): Deleted.
        (JSC::JIT::emitSlow_op_bitor): Deleted.
        (JSC::JIT::emit_op_bitxor): Deleted.
        (JSC::JIT::emitSlow_op_bitxor): Deleted.
        - Now unified with the 64-bit version using snippets. 

        * jit/JITBitAndGenerator.cpp: Added.
        (JSC::JITBitAndGenerator::generateFastPath):
        * jit/JITBitAndGenerator.h: Added.
        (JSC::JITBitAndGenerator::JITBitAndGenerator):
        * jit/JITBitOrGenerator.cpp: Added.
        (JSC::JITBitOrGenerator::generateFastPath):
        * jit/JITBitOrGenerator.h: Added.
        (JSC::JITBitOrGenerator::JITBitOrGenerator):
        * jit/JITBitXorGenerator.cpp: Added.
        (JSC::JITBitXorGenerator::generateFastPath):
        * jit/JITBitXorGenerator.h: Added.
        (JSC::JITBitXorGenerator::JITBitXorGenerator):
        * jit/JITBitwiseBinaryOpGenerator.h: Added.
        (JSC::JITBitwiseBinaryOpGenerator::JITBitwiseBinaryOpGenerator):
        (JSC::JITBitwiseBinaryOpGenerator::didEmitFastPath):
        (JSC::JITBitwiseBinaryOpGenerator::endJumpList):
        (JSC::JITBitwiseBinaryOpGenerator::slowPathJumpList):

        * jit/JITOpcodes.cpp:
        (JSC::JIT::emit_op_bitxor): Deleted.
        (JSC::JIT::emit_op_bitor): Deleted.
        (JSC::JIT::emitSlow_op_bitxor): Deleted.
        (JSC::JIT::emitSlow_op_bitor): Deleted.
        * jit/SnippetOperand.h:
        (JSC::SnippetOperand::SnippetOperand):

        * tests/stress/op_bitand.js:
        * tests/stress/op_bitor.js:
        * tests/stress/op_bitxor.js:
        - Fix a test value typo: it's supposed to be 0x7fffffff, not 0x7ffffff.

2015-12-04  Filip Pizlo  <fpizlo@apple.com>

        Having a bad time has a really awful time when it runs at the same time as the JIT
        https://bugs.webkit.org/show_bug.cgi?id=151882
        rdar://problem/23547038

        Reviewed by Geoffrey Garen.

        The DFG's use of watchpoints for havingABadTime goes back a long time. We introduced this feature
        when we first introduced watchpoints. That left it open to a lot of bitrot. On top of that, this
        code doesn't get tested much because having a bad time is not something that is really supposed to
        happen.

        Well, now I've got reports that it does happen - or at least, we know that it is because of
        crashes in an assertion that could only be triggered if a bad time was had. In the meantime, we
        added two new features without adequately testing havingABadTime: concurrent JIT and FTL.
        Concurrency means that we have to worry about the havingABadTime watchpoint triggering during
        compilation. FTL means that we have new code and new optimizations that needs to deal with this
        feature correctly.

        The bug can arise via race condition or just goofy profiling. As in the newly added test, we could
        first profile an allocation thinking that it will allocate sane arrays. Then we might have a bad
        time, and then compile that function with the FTL. The ByteCodeParser will represent the
        allocation with a NewArray node that has a sane indexingType(). But when we go to lower the Node,
        we observe that the Structure* that the JSGlobalObject tells us to use has a different indexing
        type. This is a feature of havingABadTime that the DFG knew about, but the FTL didn't. The FTL
        didn't know about it because we didn't have adequate tests, and this code rarely gets triggered in
        the wild. So, the FTL had a silly assertion that the indexing types match. They absolutely don't
        have to match.

        There is another bug, a race condition, that remains even if we remove the bad assertion. We set
        the havingABadTime watchpoint late in compilation, and we do it based on whether the watchpoint is
        still OK. This means that we could parse a function before we have a bad time and then do
        optimizations (for example in AbstractInterpreter) like proving that the structure set associated
        with the value returned by the NewArray is the one with a sane indexing type. Then, after those
        optimizations have already been done, we will go to set the watchpoint. But just as we are doing
        this, we could haveABadTime on the main thread. Currently this sort of almost works because
        having a bad time requires doing a GC, and we can't GC until the watchpoint collection phase. But
        that feels too fragile. So, this phase moves the setting of the watchpoint to the FixupPhase. This
        is consistent with our long-term goal of removing the WatchpointCollectionPhase. Moving this to
        FixupPhase means that we set the watchpoint before doing any optimizations. So, if having a bad
        time happens before the FixupPhase then all optimizations will agree that we're having a bad time
        and so everything is fine; if we have a bad time after FixupPhase then we will cancel the
        compilation anyway.

        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::handleConstantInternalFunction):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        (JSC::DFG::FixupPhase::watchHavingABadTime):
        (JSC::DFG::FixupPhase::createToString):
        * dfg/DFGNode.h:
        (JSC::DFG::Node::hasIndexingType):
        (JSC::DFG::Node::indexingType):
        * dfg/DFGWatchpointCollectionPhase.cpp:
        (JSC::DFG::WatchpointCollectionPhase::handle):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNewArray):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNewArrayBuffer):
        * tests/stress/ftl-has-a-bad-time.js: Added.

2015-12-04  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Use Div and ChillDiv in FTL(B3)Output
        https://bugs.webkit.org/show_bug.cgi?id=151844

        Reviewed by Geoffrey Garen.

        I copied part of the code of compileArithDiv()
        to create a new function FTLOutput::childDiv().

        With childDiv() being a concept of FTLOutput,
        FTLB3Output was updated accordingly.

        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::div):
        (JSC::FTL::Output::chillDiv):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithDiv):
        * ftl/FTLOutput.cpp:
        (JSC::FTL::Output::chillDiv):
        * ftl/FTLOutput.h:

2015-12-04  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Extend the strength reduction of B3's BitAnd with booleans
        https://bugs.webkit.org/show_bug.cgi?id=151852

        Reviewed by Saam Barati.

        1) Masking a boolean with any pattern that has the lsb set
           remains a boolean.
        2) ReduceStrength on that particular pattern of BitAnd.

        * b3/B3ReduceStrength.cpp:
        * b3/B3Value.cpp:
        (JSC::B3::Value::returnsBool):
        * b3/testb3.cpp:
        (JSC::B3::testBitAndWithMaskReturnsBooleans):
        (JSC::B3::run):

2015-12-04  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Add doubleRem() to FTLB3Output
        https://bugs.webkit.org/show_bug.cgi?id=151851

        Reviewed by Geoffrey Garen.

        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::doubleRem):

2015-12-04  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Add signExt() to FTLB3Output
        https://bugs.webkit.org/show_bug.cgi?id=151853

        Reviewed by Geoffrey Garen.

        Rename signExt() to signExt32To64(). This is just to separate
        it explicitly from the remaining signExt() used inside FTLOutput.

        Then use the SExt32 for implementing that in B3.

        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::signExt32To64):
        (JSC::FTL::Output::signExt): Deleted.
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileInt52Rep):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileGetDirectPname):
        (JSC::FTL::DFG::LowerDFGToLLVM::strictInt52ToInt32):
        (JSC::FTL::DFG::LowerDFGToLLVM::strictInt52ToJSValue):
        (JSC::FTL::DFG::LowerDFGToLLVM::jsValueToStrictInt52):
        * ftl/FTLOutput.h:
        (JSC::FTL::Output::signExt32To64):
        (JSC::FTL::Output::signExt):

2015-12-04  Joseph Pecoraro  <pecoraro@apple.com>

        Web Inspector: Unskip many inspector/debugger tests
        https://bugs.webkit.org/show_bug.cgi?id=151843

        Reviewed by Timothy Hatcher.

        * bindings/ScriptFunctionCall.cpp:
        (Deprecated::ScriptFunctionCall::call):
        Ignore TerminationExceptions, as those aren't real execution
        exceptions and may be seen on Workers that have closed.

2015-12-04  Joseph Pecoraro  <pecoraro@apple.com>

        Web Inspector: Remove untested and unused Worker inspection
        https://bugs.webkit.org/show_bug.cgi?id=151848

        Reviewed by Brian Burg.

        * CMakeLists.txt:
        * DerivedSources.make:
        * debugger/Debugger.cpp:
        (JSC::Debugger::Debugger):
        (JSC::Debugger::willExecuteProgram):
        * debugger/Debugger.h:
        * inspector/JSGlobalObjectScriptDebugServer.cpp:
        (Inspector::JSGlobalObjectScriptDebugServer::JSGlobalObjectScriptDebugServer):
        * inspector/ScriptDebugServer.cpp:
        (Inspector::ScriptDebugServer::ScriptDebugServer):
        * inspector/ScriptDebugServer.h:
        * inspector/agents/InspectorConsoleAgent.h:
        * inspector/agents/InspectorRuntimeAgent.cpp:
        (Inspector::InspectorRuntimeAgent::run): Deleted.
        * inspector/agents/InspectorRuntimeAgent.h:
        * inspector/agents/JSGlobalObjectConsoleAgent.h:
        * inspector/protocol/Runtime.json:
        * inspector/protocol/Worker.json: Removed.

2015-12-04  Joseph Pecoraro  <pecoraro@apple.com>

        Web Inspector: Specifically Identify the Global Lexical Environment Scope
        https://bugs.webkit.org/show_bug.cgi?id=151828

        Reviewed by Brian Burg.

        * inspector/InjectedScriptSource.js:
        Include the new scope type.

        * inspector/JSJavaScriptCallFrame.h:
        * inspector/JSJavaScriptCallFrame.cpp:
        (Inspector::JSJavaScriptCallFrame::scopeType):
        Set the new value for the new scope type.

        * inspector/JSJavaScriptCallFramePrototype.cpp:
        (Inspector::JSJavaScriptCallFramePrototype::finishCreation): Deleted.
        (Inspector::jsJavaScriptCallFrameConstantGLOBAL_SCOPE): Deleted.
        (Inspector::jsJavaScriptCallFrameConstantLOCAL_SCOPE): Deleted.
        (Inspector::jsJavaScriptCallFrameConstantWITH_SCOPE): Deleted.
        (Inspector::jsJavaScriptCallFrameConstantCLOSURE_SCOPE): Deleted.
        (Inspector::jsJavaScriptCallFrameConstantCATCH_SCOPE): Deleted.
        (Inspector::jsJavaScriptCallFrameConstantFUNCTION_NAME_SCOPE): Deleted.
        Remove unused constants on the JavaScriptCallFrame object.
        Currently they are just hardcoded in InjectedScriptSource
        and they don't make sense on instances anyways.

2015-12-04  Keith Miller  <keith_miller@apple.com>

        Add an option to emit instructions validating exceptions in the DFG rather than always emiting them.
        https://bugs.webkit.org/show_bug.cgi?id=151841

        Reviewed by Saam Barati.

        Add a new option that validates the DFG execption checking. The default value for the option is
        true in Debug builds and false in Release builds. Additionally, renamed jitAssertNoException to
        jitReleaseAssertNoException for consistency with our ASSERT naming convention.

        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileCurrentBlock):
        * jit/AssemblyHelpers.cpp:
        (JSC::AssemblyHelpers::jitReleaseAssertNoException):
        (JSC::AssemblyHelpers::jitAssertNoException): Deleted.
        * jit/AssemblyHelpers.h:
        (JSC::AssemblyHelpers::jitAssertNoException): Deleted.
        * runtime/Options.cpp:
        (JSC::recomputeDependentOptions):
        * runtime/Options.h:

2015-12-04  Csaba Osztrogonác  <ossy@webkit.org>

        Fix the !ENABLE(DFG_JIT) build after r190735
        https://bugs.webkit.org/show_bug.cgi?id=151617

        Reviewed by Filip Pizlo.

        * jit/GCAwareJITStubRoutine.cpp:
        (JSC::GCAwareJITStubRoutineWithExceptionHandler::observeZeroRefCount):

2015-12-04  Csaba Osztrogonác  <ossy@webkit.org>

        [cmake] Fix the B3 build after r192946
        https://bugs.webkit.org/show_bug.cgi?id=151857

        Reviewed by Michael Saboff.

        * CMakeLists.txt:

2015-12-04  Csaba Osztrogonác  <ossy@webkit.org>

        [AArch64] Typo fix after r189575
        https://bugs.webkit.org/show_bug.cgi?id=151855

        Reviewed by Michael Saboff.

        * ftl/FTLUnwindInfo.cpp:
        (JSC::FTL::parseUnwindInfo):

2015-12-03  Filip Pizlo  <fpizlo@apple.com>

        B3 Patchpoint and Check opcodes should be able to specify WarmAny, ColdAny, and LateColdAny
        https://bugs.webkit.org/show_bug.cgi?id=151335

        Reviewed by Geoffrey Garen.

        This removes ValueRep::Any and replaces it with ValueRep::WarmAny, ValueRep::ColdAny, and
        ValueRep::LateColdAny. I think that conceptually the most obvious users of patchpoints are inline
        caches, which would use WarmAny for their non-OSR inputs. For this reason, I make WarmAny the
        default.

        However, the StackmapValue optimization that provides a default ValueRep for any that are missing
        was meant for OSR. So, this optimization now uses ColdAny.

        This patch wires this change through the whole compiler and adds some tests.

        * b3/B3CheckSpecial.cpp:
        (JSC::B3::CheckSpecial::Key::Key):
        (JSC::B3::CheckSpecial::Key::dump):
        (JSC::B3::CheckSpecial::CheckSpecial):
        * b3/B3CheckSpecial.h:
        (JSC::B3::CheckSpecial::Key::Key):
        (JSC::B3::CheckSpecial::Key::opcode):
        (JSC::B3::CheckSpecial::Key::numArgs):
        (JSC::B3::CheckSpecial::Key::stackmapRole):
        * b3/B3CheckValue.cpp:
        (JSC::B3::CheckValue::CheckValue):
        * b3/B3ConstrainedValue.h:
        (JSC::B3::ConstrainedValue::ConstrainedValue):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::fillStackmap):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3MoveConstants.cpp:
        * b3/B3PatchpointSpecial.cpp:
        (JSC::B3::PatchpointSpecial::forEachArg):
        (JSC::B3::PatchpointSpecial::isValid):
        (JSC::B3::PatchpointSpecial::admitsStack):
        * b3/B3PatchpointValue.cpp:
        (JSC::B3::PatchpointValue::PatchpointValue):
        * b3/B3PatchpointValue.h:
        * b3/B3StackmapSpecial.cpp:
        (JSC::B3::StackmapSpecial::forEachArgImpl):
        (JSC::B3::StackmapSpecial::admitsStackImpl):
        (JSC::B3::StackmapSpecial::isArgValidForRep):
        (WTF::printInternal):
        * b3/B3StackmapSpecial.h:
        * b3/B3StackmapValue.cpp:
        (JSC::B3::StackmapValue::append):
        (JSC::B3::StackmapValue::setConstraint):
        * b3/B3StackmapValue.h:
        * b3/B3Validate.cpp:
        * b3/B3ValueRep.cpp:
        (JSC::B3::ValueRep::dump):
        (WTF::printInternal):
        * b3/B3ValueRep.h:
        (JSC::B3::ValueRep::ValueRep):
        (JSC::B3::ValueRep::reg):
        (JSC::B3::ValueRep::operator!=):
        (JSC::B3::ValueRep::operator bool):
        (JSC::B3::ValueRep::isAny):
        (JSC::B3::ValueRep::isSomeRegister):
        * b3/testb3.cpp:
        (JSC::B3::compileAndRun):
        (JSC::B3::add32):
        (JSC::B3::test42):
        (JSC::B3::testSimplePatchpoint):
        (JSC::B3::testPatchpointWithEarlyClobber):
        (JSC::B3::testPatchpointFixedRegister):
        (JSC::B3::testPatchpointAny):
        (JSC::B3::testPatchpointLotsOfLateAnys):
        (JSC::B3::testPatchpointAnyImm):
        (JSC::B3::testPatchpointManyImms):
        (JSC::B3::testPatchpointWithRegisterResult):
        (JSC::B3::testPatchpointWithAnyResult):
        (JSC::B3::run):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::blessSpeculation):

2015-12-03  Filip Pizlo  <fpizlo@apple.com>

        B3 patchpoints should allow specifying output constraints
        https://bugs.webkit.org/show_bug.cgi?id=151809

        Reviewed by Benjamin Poulain.

        JS call patchpoints should put their result into the result register, while most other patchpoints
        should put their results into some register. I think that it's best if we just allow arbitrary
        constraints on the result of a patchpoint. And by "arbitrary" I mean allowing the same kinds of
        constraints as we allow on the stackmap children.

        This also adds a large comment in B3StackmapValue.h that lays out the philosophy of our stackmaps
        and patchpoints. I found it useful to write down the plan since it's pretty subtle.

        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3PatchpointSpecial.cpp:
        (JSC::B3::PatchpointSpecial::isValid):
        (JSC::B3::PatchpointSpecial::admitsStack):
        * b3/B3PatchpointValue.cpp:
        (JSC::B3::PatchpointValue::~PatchpointValue):
        (JSC::B3::PatchpointValue::dumpMeta):
        (JSC::B3::PatchpointValue::PatchpointValue):
        * b3/B3PatchpointValue.h:
        (JSC::B3::PatchpointValue::accepts):
        * b3/B3Procedure.h:
        (JSC::B3::Procedure::code):
        * b3/B3StackmapSpecial.cpp:
        (JSC::B3::StackmapSpecial::isValidImpl):
        (JSC::B3::StackmapSpecial::appendRepsImpl):
        (JSC::B3::StackmapSpecial::isArgValidForValue):
        (JSC::B3::StackmapSpecial::isArgValidForRep):
        (JSC::B3::StackmapSpecial::repForArg):
        * b3/B3StackmapSpecial.h:
        * b3/B3StackmapValue.h:
        * b3/B3Validate.cpp:
        * b3/B3ValueRep.h:
        (JSC::B3::ValueRep::doubleValue):
        * b3/testb3.cpp:
        (JSC::B3::testPatchpointManyImms):
        (JSC::B3::testPatchpointWithRegisterResult):
        (JSC::B3::testPatchpointWithStackArgumentResult):
        (JSC::B3::testPatchpointWithAnyResult):
        (JSC::B3::testSimpleCheck):
        (JSC::B3::run):
        * jit/RegisterSet.h:

2015-12-03  Anders Carlsson  <andersca@apple.com>

        Remove Objective-C GC support
        https://bugs.webkit.org/show_bug.cgi?id=151819
        rdar://problem/23746991

        Reviewed by Dan Bernstein.

        * Configurations/Base.xcconfig:
        * Configurations/ToolExecutable.xcconfig:

2015-12-03  Benjamin Poulain  <bpoulain@apple.com>

        Attempt to fix GTK again after r193125

        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::supportsLZCNT):

2015-12-03  Benjamin Poulain  <bpoulain@apple.com>

        Attempt to fix GTK after r193125

        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::supportsLZCNT):
        GCC is unable to handle EBX correctly when clobbered by inline asm.

2015-12-03  Saam barati  <sbarati@apple.com>

        FTL::OSRExitDescriptor should use less memory by having a companion object that dies after compilation
        https://bugs.webkit.org/show_bug.cgi?id=151795

        Reviewed by Geoffrey Garen.

        There were a few fields on FTL::OSRExitDescriptor that are only
        needed during compilation. This patch introduces OSRExitDescriptorImpl 
        which is a struct that we create for each OSRExitDescriptor. The difference is 
        that OSRExitDescriptorImpl lives off of FTL::State so it dies after we compile.
        This way no unnecessary fields persist after the compilation.

        * ftl/FTLCompile.cpp:
        (JSC::FTL::mmAllocateDataSection):
        * ftl/FTLExceptionHandlerManager.cpp:
        (JSC::FTL::ExceptionHandlerManager::lazySlowPathExceptionTarget):
        (JSC::FTL::ExceptionHandlerManager::getCallOSRExitCommon):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileInvalidationPoint):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExitArgumentsForPatchpointIfWillCatchException):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExitDescriptor):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExit):
        (JSC::FTL::DFG::LowerDFGToLLVM::blessSpeculation):
        (JSC::FTL::DFG::LowerDFGToLLVM::emitOSRExitCall):
        (JSC::FTL::DFG::LowerDFGToLLVM::buildExitArguments):
        * ftl/FTLOSRExit.cpp:
        (JSC::FTL::OSRExitDescriptor::OSRExitDescriptor):
        (JSC::FTL::OSRExitDescriptor::validateReferences):
        (JSC::FTL::OSRExitDescriptor::emitOSRExit):
        (JSC::FTL::OSRExitDescriptor::emitOSRExitLater):
        (JSC::FTL::OSRExitDescriptor::prepareOSRExitHandle):
        (JSC::FTL::OSRExit::OSRExit):
        (JSC::FTL::OSRExit::codeLocationForRepatch):
        (JSC::FTL::OSRExit::gatherRegistersToSpillForCallIfException):
        (JSC::FTL::OSRExit::willArriveAtExitFromIndirectExceptionCheck):
        (JSC::FTL::exceptionTypeWillArriveAtOSRExitFromGenericUnwind):
        (JSC::FTL::OSRExit::willArriveAtOSRExitFromGenericUnwind):
        (JSC::FTL::OSRExit::willArriveAtOSRExitFromCallOperation):
        (JSC::FTL::OSRExitDescriptor::isExceptionHandler): Deleted.
        * ftl/FTLOSRExit.h:
        (JSC::FTL::OSRExitDescriptorImpl::OSRExitDescriptorImpl):
        * ftl/FTLOSRExitCompiler.cpp:
        (JSC::FTL::compileFTLOSRExit):
        * ftl/FTLState.h:

2015-12-03  Alex Christensen  <achristensen@webkit.org>

        Fix 64-bit Windows build after r193125.
        https://bugs.webkit.org/show_bug.cgi?id=151799

        Reviewed by Michael Saboff.

        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::supportsLZCNT):
        Use __cpuid intrinsic instead of inline assembly.

2015-12-02  Filip Pizlo  <fpizlo@apple.com>

        FTL B3 should support OSR exit
        https://bugs.webkit.org/show_bug.cgi?id=151710

        Reviewed by Saam Barati.

        This adds OSR exit support using the same style that I established with lazy slow paths. All of
        the work is driven by FTL::LowerDFGToLLVM, and from there any work that needs to be deferred
        until after B3 finishes is attached to the stackmap generator. In order to make it easy to port
        all of the different forms of OSR exit - invalidation points, exceptions, etc. - the logic for
        registering an OSR exit is abstracted behind OSRExitDescriptor and OSRExitHandle.

        An issue that I encountered repeatedly in this patch is OSRExitDescriptor being passed as a
        reference (&) rather than pointer (*). The new code uses a lot of lambdas that run after the
        current frame pops, so the capture list cannot be [&]. I believe that always listing all of the
        captured variables is not scalable considering how sophisticated our use of lambdas is. So, it
        makes sense to use [=]. But anytime we captured a variable whose type was OSRExitDescriptor&, it
        would be captured by value, because that's how references work. One has to be mindful of these
        things whenever using [=]. Note that it's not enough to say that we should have listed the
        captured variables explicitly - in that case, we still could have made the mistake by forgetting
        to put & in front of the variant. The pattern that worked for me to reason about whether I'm
        capturing an object or a pointer to an object is to always use pointer types for pointers: either
        RefPtr<> when we also want the lambda to prolong the object's life, or * if we are confident that
        the object will stay alive. For this reason, this patch changes all code that references
        OSRExitDescriptor to use * instead of &. Consistency makes the code easier to grok, and it made
        it easier to introduce the required uses of * in places where there were lambdas.

        I tested this by running imaging-gaussian-blur, and running some tests that reqiure OSR exit. I'm
        not promising that all kinds of exits work, but we have to begin somewhere.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/B3Compilation.cpp:
        (JSC::B3::Compilation::Compilation):
        (JSC::B3::Compilation::~Compilation):
        * b3/B3Procedure.cpp:
        (JSC::B3::Procedure::addDataSection):
        (JSC::B3::Procedure::frameSize):
        (JSC::B3::Procedure::calleeSaveRegisters):
        * b3/B3Procedure.h:
        (JSC::B3::Procedure::releaseByproducts):
        (JSC::B3::Procedure::code):
        (JSC::B3::Procedure::takeByproducts): Deleted.
        * b3/air/AirCode.h:
        (JSC::B3::Air::Code::setFrameSize):
        (JSC::B3::Air::Code::calleeSaveRegisters):
        * b3/air/AirGenerationContext.h:
        * ftl/FTLB3Compile.cpp:
        (JSC::FTL::compile):
        * ftl/FTLCompile.cpp:
        (JSC::FTL::mmAllocateDataSection):
        * ftl/FTLExceptionHandlerManager.cpp:
        (JSC::FTL::ExceptionHandlerManager::lazySlowPathExceptionTarget):
        (JSC::FTL::ExceptionHandlerManager::getCallOSRExitCommon):
        * ftl/FTLExitThunkGenerator.cpp:
        * ftl/FTLExitThunkGenerator.h:
        * ftl/FTLJITCode.cpp:
        (JSC::FTL::JITCode::JITCode):
        (JSC::FTL::JITCode::initializeB3Code):
        (JSC::FTL::JITCode::initializeB3Byproducts):
        (JSC::FTL::JITCode::initializeExitThunks):
        (JSC::FTL::JITCode::validateReferences):
        (JSC::FTL::JITCode::liveRegistersToPreserveAtExceptionHandlingCallSite):
        * ftl/FTLJITCode.h:
        * ftl/FTLJITFinalizer.cpp:
        (JSC::FTL::JITFinalizer::finalizeFunction):
        * ftl/FTLJITFinalizer.h:
        * ftl/FTLJSCall.cpp:
        (JSC::FTL::JSCall::emit):
        * ftl/FTLJSCallBase.cpp:
        (JSC::FTL::JSCallBase::emit):
        * ftl/FTLJSTailCall.cpp:
        (JSC::FTL::JSTailCall::JSTailCall):
        (JSC::FTL::JSTailCall::emit):
        (JSC::FTL::DFG::getRegisterWithAddend): Deleted.
        (JSC::FTL::m_instructionOffset): Deleted.
        * ftl/FTLJSTailCall.h:
        (JSC::FTL::JSTailCall::patchpoint):
        (JSC::FTL::JSTailCall::stackmapID):
        (JSC::FTL::JSTailCall::estimatedSize):
        (JSC::FTL::JSTailCall::operator<):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileInvalidationPoint):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExitArgumentsForPatchpointIfWillCatchException):
        (JSC::FTL::DFG::LowerDFGToLLVM::lowBlock):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExitDescriptor):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExit):
        (JSC::FTL::DFG::LowerDFGToLLVM::blessSpeculation):
        (JSC::FTL::DFG::LowerDFGToLLVM::emitOSRExitCall):
        (JSC::FTL::DFG::LowerDFGToLLVM::buildExitArguments):
        (JSC::FTL::DFG::LowerDFGToLLVM::callStackmap):
        (JSC::FTL::lowerDFGToLLVM):
        * ftl/FTLOSRExit.cpp:
        (JSC::FTL::OSRExitDescriptor::OSRExitDescriptor):
        (JSC::FTL::OSRExitDescriptor::validateReferences):
        (JSC::FTL::OSRExitDescriptor::appendOSRExit):
        (JSC::FTL::OSRExitDescriptor::appendOSRExitLater):
        (JSC::FTL::OSRExitDescriptor::prepareOSRExitHandle):
        (JSC::FTL::OSRExit::OSRExit):
        (JSC::FTL::OSRExit::codeLocationForRepatch):
        (JSC::FTL::OSRExit::gatherRegistersToSpillForCallIfException):
        (JSC::FTL::OSRExit::spillRegistersToSpillSlot):
        (JSC::FTL::OSRExit::recoverRegistersFromSpillSlot):
        (JSC::FTL::OSRExit::willArriveAtExitFromIndirectExceptionCheck):
        * ftl/FTLOSRExit.h:
        (JSC::FTL::OSRExit::considerAddingAsFrequentExitSite):
        * ftl/FTLOSRExitCompilationInfo.h:
        (JSC::FTL::OSRExitCompilationInfo::OSRExitCompilationInfo):
        * ftl/FTLOSRExitCompiler.cpp:
        (JSC::FTL::reboxAccordingToFormat):
        (JSC::FTL::compileRecovery):
        (JSC::FTL::compileStub):
        (JSC::FTL::compileFTLOSRExit):
        * ftl/FTLOSRExitHandle.cpp: Added.
        (JSC::FTL::OSRExitHandle::emitExitThunk):
        * ftl/FTLOSRExitHandle.h: Added.
        (JSC::FTL::OSRExitHandle::OSRExitHandle):
        * ftl/FTLState.cpp:
        (JSC::FTL::State::State):
        (JSC::FTL::State::~State):

2015-12-03  Joseph Pecoraro  <pecoraro@apple.com>

        REGRESSION:(r192753): Remote Web Inspector: RemoteInspector::sendMessageToRemote with null connection
        https://bugs.webkit.org/show_bug.cgi?id=151789

        Reviewed by Timothy Hatcher.

        * inspector/remote/RemoteInspector.mm:
        (Inspector::RemoteInspector::sendMessageToRemote):
        Bail if the connection is no longer available. It may have
        been closed remotely.

2015-12-03  Joseph Pecoraro  <pecoraro@apple.com>

        REGRESSION:(r192753): Remote Web Inspector: Window immediately closes after opening
        https://bugs.webkit.org/show_bug.cgi?id=151788

        Reviewed by Timothy Hatcher.

        * inspector/remote/RemoteInspector.mm:
        (Inspector::RemoteInspector::pushListingsNow):
        The key at the outer level was not a string. Ensure it is a
        string for backwards compatibility. One day we may use
        non-numeric page identifiers as listing keys.

2015-12-03  Joseph Pecoraro  <pecoraro@apple.com>

        REGRESSION(r192753): Remote Web Inspector: Enabling Remote Inspection on Auto Inspect candidate Debuggable doesn't show up in debuggers
        https://bugs.webkit.org/show_bug.cgi?id=151792

        Reviewed by Brian Burg.

        * inspector/remote/RemoteInspector.mm:
        (Inspector::RemoteInspector::updateAutomaticInspectionCandidate):
        When m_debuggablesMap was split into both m_targetMap and m_listingMap
        this particular case was missed in updating both the target and listing
        when the target is updated. We should match RemoteInspector::updateTarget
        and update the listing map as the debuggable may have changed to be
        allowed to debug.

2015-12-03  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Add CLZ support to B3
        https://bugs.webkit.org/show_bug.cgi?id=151799

        Reviewed by Michael Saboff.

        Previously we were counting on LLVM to select LZCNT
        when its available.
        Since we have to do that ourself now, I added feature
        detection based on the CPUID. The MacroAssembler just
        pick the best available lowering based on the platform.

        * assembler/MacroAssemblerX86Common.cpp:
        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::countLeadingZeros32):
        (JSC::MacroAssemblerX86Common::supportsLZCNT):
        (JSC::MacroAssemblerX86Common::clz32AfterBsr):
        * assembler/MacroAssemblerX86_64.h:
        (JSC::MacroAssemblerX86_64::countLeadingZeros64):
        (JSC::MacroAssemblerX86_64::clz64AfterBsr):
        * assembler/X86Assembler.h:
        (JSC::X86Assembler::lzcnt_rr):
        (JSC::X86Assembler::lzcnt_mr):
        (JSC::X86Assembler::lzcntq_rr):
        (JSC::X86Assembler::lzcntq_mr):
        (JSC::X86Assembler::bsr_mr):
        (JSC::X86Assembler::bsrq_rr):
        (JSC::X86Assembler::bsrq_mr):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3Opcode.cpp:
        (WTF::printInternal):
        * b3/B3Opcode.h:
        * b3/B3Validate.cpp:
        * b3/B3Value.cpp:
        (JSC::B3::Value::effects):
        (JSC::B3::Value::key):
        (JSC::B3::Value::typeFor):
        * b3/air/AirOpcode.opcodes:
        * b3/testb3.cpp:
        (JSC::B3::countLeadingZero):
        (JSC::B3::testClzArg64):
        (JSC::B3::testClzMem64):
        (JSC::B3::testClzArg32):
        (JSC::B3::testClzMem32):
        (JSC::B3::doubleOperands):
        (JSC::B3::run):
        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::ctlz32):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithClz32):
        * ftl/FTLOutput.h:
        (JSC::FTL::Output::ctlz32):

2015-12-02  Mark Lam  <mark.lam@apple.com>

        Polymorphic operand types for DFG and FTL mul.
        https://bugs.webkit.org/show_bug.cgi?id=151746

        Reviewed by Filip Pizlo.

        Perf on benchmarks is neutral except for the newly added JSRegress ftl-object-mul
        test which shows a 2.16x speed up on x86_64 FTL, 1.27x speed up on x86_64 DFG,
        and 1.56x on x86 DFG. 

        The speed up comes not from the mul operator itself, but from the fact that the
        polymorphic operand types support now allow the test function to run without OSR
        exiting, thereby realizing the DFG and FTL's speed up on other work that the test
        function does.

        This patch has passed the layout tests on x86_64 with a debug build.
        It passed the JSC tests with x86 and x86_64 debug builds.

        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGOperations.cpp:
        * dfg/DFGOperations.h:
        * dfg/DFGPredictionPropagationPhase.cpp:
        (JSC::DFG::PredictionPropagationPhase::propagate):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileArithMul):
        * ftl/FTLCompile.cpp:
        - Changed to call generateBinaryOpFastPath() instead now, and let it dispatch to
          the appropriate snippet generator.

        * ftl/FTLCompileBinaryOp.cpp:
        (JSC::FTL::generateBinaryArithOpFastPath):
        (JSC::FTL::generateBinaryOpFastPath):
        (JSC::FTL::generateArithSubFastPath): Deleted.
        (JSC::FTL::generateValueAddFastPath): Deleted.
        - Refactored these functions to eliminate the need for copy-pasting every time
          we add support for another binary arithmetic snippet.

        * ftl/FTLCompileBinaryOp.h:
        * ftl/FTLInlineCacheDescriptor.h:
        * ftl/FTLInlineCacheDescriptorInlines.h:
        (JSC::FTL::ArithMulDescriptor::ArithMulDescriptor):
        (JSC::FTL::ArithMulDescriptor::icSize):
        * ftl/FTLInlineCacheSize.cpp:
        (JSC::FTL::sizeOfArithMul):
        * ftl/FTLInlineCacheSize.h:
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::lower):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithMul):
        * jit/JITMulGenerator.h:
        (JSC::JITMulGenerator::JITMulGenerator):

        * tests/stress/op_mul.js:
        - Updated a test value: the interesting value for imminent overflow from an
          int32 is 0x7fffffff, not 0x7ffffff.

2015-12-02  Joseph Pecoraro  <pecoraro@apple.com>

        REGRESSION(r192753): Remote Web Inspector: Applications and Debuggables not showing up in debuggers
        https://bugs.webkit.org/show_bug.cgi?id=151787

        Reviewed by Brian Burg.

        * inspector/remote/RemoteInspector.mm:
        (Inspector::RemoteInspector::receivedIndicateMessage):
        Removed lock that was unnecessarily added in r192753. It was
        protecting nothing.

2015-12-02  Saam barati  <sbarati@apple.com>

        Insert a FIXME comment FTLLazySlowPath.h to remind us to remove/refactor the ScratchRegisterAllocator field.

        Rubber-stamped by Filip Pizlo.

        * ftl/FTLLazySlowPath.h:

2015-12-02  Benjamin Poulain  <benjamin@webkit.org>

        [JSC] Remove insertElement() from FTLB3Output
        https://bugs.webkit.org/show_bug.cgi?id=151781

        Reviewed by Sam Weinig.

        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::insertElement): Deleted.
        That's a LLVM concept.

2015-12-02  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Remove stuffs related to alloca from FTLB3Output
        https://bugs.webkit.org/show_bug.cgi?id=151780

        Reviewed by Mark Lam.

        We can use the Phis directly with B3 :)

        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::alloca): Deleted.
        (JSC::FTL::Output::get): Deleted.
        (JSC::FTL::Output::set): Deleted.

2015-12-02  Benjamin Poulain  <benjamin@webkit.org>

        [JSC] Add sin(), cos(), pow() and log() to B3
        https://bugs.webkit.org/show_bug.cgi?id=151778

        Reviewed by Geoffrey Garen.

        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::doubleSin):
        (JSC::FTL::Output::doubleCos):
        (JSC::FTL::Output::doublePow):
        (JSC::FTL::Output::doubleLog):
        (JSC::FTL::Output::callWithoutSideEffects):

2015-12-02  Filip Pizlo  <fpizlo@apple.com>

        Add a few obvious strength-reductions to Air
        https://bugs.webkit.org/show_bug.cgi?id=151777

        Reviewed by Mark Lam.

        The absence of these optimizations was obnoxious.

        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::add32): lea 1(reg), reg -> add 1, reg.
        * b3/air/AirGenerate.cpp:
        (JSC::B3::Air::generate): Emit simpler prologue/epilogue if !frameSize.
        * b3/air/AirOpcode.opcodes: We have matching for BranchMul32 with immediate, but we forgot to add the instruction form.
        * jit/AssemblyHelpers.h: Support for the prologue/epilogue optimizations.
        (JSC::AssemblyHelpers::emitFunctionPrologue):
        (JSC::AssemblyHelpers::emitFunctionEpilogueWithEmptyFrame):
        (JSC::AssemblyHelpers::emitFunctionEpilogue):

2015-12-02  Benjamin Poulain  <bpoulain@apple.com>

        Update the interface added in r192967

        * b3/B3CCallValue.h:
        Filip prefers explicit effects.
        * b3/testb3.cpp:
        (JSC::B3::testCallSimplePure):

2015-12-02  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Add a function attribute for Pure functions in B3
        https://bugs.webkit.org/show_bug.cgi?id=151741

        Reviewed by Geoffrey Garen.

        We have plenty of functions without side effects
        when lowering DFG.
        This patch adds the "PureCall" flag to B3's CCall
        to make sure those functions do not prevent optimizations.

        * b3/B3CCallValue.h:
        * b3/testb3.cpp:
        (JSC::B3::testCallSimplePure):
        (JSC::B3::run):

2015-12-02  Mark Lam  <mark.lam@apple.com>

        Removed unnecessary #if USE(JSVALUE64).
        https://bugs.webkit.org/show_bug.cgi?id=151733

        Not reviewed.

        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):

2015-12-02  Mark Lam  <mark.lam@apple.com>

        Use the JITAddGenerator snippet in the FTL.
        https://bugs.webkit.org/show_bug.cgi?id=151519

        Reviewed by Geoffrey Garen.

        One detail about how we choosing to handle operands to the binary snippets that
        may be constant: the slow path call to a C++ function still needs the constant
        operand loaded in a register.  To simplify things, we're choosing to always tell
        LLVM to load the operands into registers even if they may be constant.  However,
        even though a constant operand is preloaded in a register, the snippet generator
        will not be made aware of it.  It will continue to load the constant as an
        immediate.

        * ftl/FTLCompile.cpp:
        * ftl/FTLCompileBinaryOp.cpp:
        (JSC::FTL::generateArithSubFastPath):
        (JSC::FTL::generateValueAddFastPath):
        - generateValueAddFastPath() currently is an exact copy of generateArithSubFastPath()
          except that it uses JITAddGenerator instead of JITSubGenerator.  When we add
          support for JITMulGenerator later, the code will start to vary.  We'll refactor
          these functions then when we have more insight into what needs to vary between
          the implementations.

        * ftl/FTLCompileBinaryOp.h:
        * ftl/FTLInlineCacheDescriptor.h:
        * ftl/FTLInlineCacheDescriptorInlines.h:
        (JSC::FTL::ValueAddDescriptor::ValueAddDescriptor):
        (JSC::FTL::ValueAddDescriptor::icSize):
        * ftl/FTLInlineCacheSize.cpp:
        (JSC::FTL::sizeOfValueAdd):
        * ftl/FTLInlineCacheSize.h:
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::lower):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileValueAdd):

2015-12-02  Mark Lam  <mark.lam@apple.com>

        Teach DFG that ArithSub can now clobber the heap (and other things).
        https://bugs.webkit.org/show_bug.cgi?id=151733

        Reviewed by Geoffrey Garen.

        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGPredictionPropagationPhase.cpp:
        (JSC::DFG::PredictionPropagationPhase::propagate):

2015-12-02  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Handle x86 partial register stalls in Air
        https://bugs.webkit.org/show_bug.cgi?id=151735

        Reviewed by Filip Pizlo.

        This patch adds a primitive false-dependency breaking
        algorithm to Air. We look for redefinition of the same
        variable that is too close to a partial definition.

        There is not explicit dependency tracking going on,
        but it is pretty fast and the extra xorps added on false-positives
        are cheap anyway.

        Typically, partial register stalls appear from instructions
        interfering with themselves in small loops. Something like:

          Label0:
            cvtsi2sdq %eax, %xmm0
            ...
            jmp Label0

        Those are correctly detected by propagating the local distance
        information from block to block until no unsafe chain is found.

        The test testInt32ToDoublePartialRegisterStall() checks the kind
        of cases we typically find from JavaScript.
        The execution time is 20% faster with a register reset (which is
        astounding since the very next instruction has a real dependency).

        Future tweaks will be needed when we can run more JavaScript:
        -Handle function calls differently.
        -Anything with a special can have hidden instructions.
         We need to take them into account.

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::moveZeroToDouble):
        * assembler/X86Assembler.h:
        (JSC::X86Assembler::xorps_rr):
        (JSC::X86Assembler::xorpd_rr):
        According to the documentation, starting with Sandy Bridge,
        registers reset can be done in the frontend with xorps.

        * b3/B3IndexSet.h:
        (JSC::B3::IndexSet::remove):
        * b3/air/AirFixPartialRegisterStalls.cpp: Added.
        (JSC::B3::Air::fixPartialRegisterStalls):
        * b3/air/AirFixPartialRegisterStalls.h: Added.
        * b3/air/AirGenerate.cpp:
        (JSC::B3::Air::prepareForGeneration):
        * b3/testb3.cpp:
        (JSC::B3::testInt32ToDoublePartialRegisterStall):
        (JSC::B3::run):
        * jit/FPRInfo.h:

2015-12-01  Yusuke Suzuki  <utatane.tea@gmail.com>

        [ES6] Implement LLInt/Baseline Support for ES6 Generators and enable this feature
        https://bugs.webkit.org/show_bug.cgi?id=150792

        Reviewed by Saam Barati.

        This patch implements basic functionality of ES6 Generators in LLInt and Baseline tiers.
        While the implementation has some inefficient part, the implementation covers edge cases.
        Later, we will make this efficient.

            https://bugs.webkit.org/show_bug.cgi?id=151545
            https://bugs.webkit.org/show_bug.cgi?id=151546
            https://bugs.webkit.org/show_bug.cgi?id=151547
            https://bugs.webkit.org/show_bug.cgi?id=151552
            https://bugs.webkit.org/show_bug.cgi?id=151560
            https://bugs.webkit.org/show_bug.cgi?id=151586

        To encourage DFG / FTL later, we take the following design.

        1. Use switch_imm to jump to the save/resume points.

        Instead of saving / restoring instruction pointer to resume from it, we use switch_imm to jump to the resume point.
        This limits one entry point to a given generator function. This design makes inlining easy.
        The generated code becomes the following.

            function @generatorNext(@generator, @generatorState, @generatorValue, @generatorResumeMode)
            {
                switch (@generatorState) {
                case Initial:
                    ...
                    initial sequence.
                    ...


                    op_save(Yield_0);  // op_save contains *virtual* jump to Yield_0.
                                       // CFG shows a jump edge to Yield_0 point, but it won't be actually used.
                    return ...;

                case Yield_0:
                    op_resume();
                    if (@generatorResumeMode == Throw)
                        ...
                    else if (@generatorResumeMode == Return)
                        ...
                    ...
                    // sentValue is a value sent from a caller by `generator.next(sentValue)`.
                    sentValue = @generatorValue;
                    ...
                    op_save(Yield_1);
                    return ...;

                case Yield_1:
                    op_resume();
                    if (@generatorResumeMode == Throw)
                        ...
                    else if (@generatorResumeMode == Return)
                        ...
                    ...
                    sentValue = @generatorValue;
                    ...

                ...
                }
            }

            Resume sequence should not be emitted per yield.
            This should be done in https://bugs.webkit.org/show_bug.cgi?id=151552.

        2. Store live frame registers to GeneratorFrame

        To save and resume generator's state, we save all the live registers in GeneratorFrame.
        And when resuming, we refill registers with saved ones.
        Since saved register contains scope register, |this| etc., the environment including the scope chain will be recovered automatically.
        While saving and resuming callee registers, we don't save parameter registers.
        These registers will be used to control generator's resume behavior.

        We perform BytecodeLivenessAnalysis in CodeBlock to determine actually *def*ined registers at that resume point.

        3. GeneratorFunction will evaluate parameters before generating Generator

        Generator's parameter should be evaluated before entering Generator's body. For example,

            function hello() { ... }
            function *gen(a, b = hello())
            {
                yield b;
            }
            let g = gen(20);  // Now, hello should be called.

        To enable this, we evaluate parameters in GeneratorFunction, and after that, we create a Generator and return it.
        This can be explained by the following pseudo code.

            function *gen(a, b = hello())
            {
                // This is generator.
                return {
                    @generatorNext: function (@generator, @generatorState, @generatorValue, @generatorResumeMode)
                    {
                        ...
                    }
                }
            }

        4. op_save seems similar to conditional jump

        We won't jump to elsewhere from op_save actually. But we add a *virtual* jump edge (flow) from op_save to the point so called *merge point*.
        We construct the CFG as follows,

            (global generator switch) -> (initial sequence) -> (op_save) ----+-> (merge point) -> (next sequence)*
                   |                                              |          |
                   |                                              v          |
                   |                                           (op_ret)      |
                   |                                                         |
                   +------------------------------------------->(op_resume)--+

        By constructing such a graph,

            1. Since we have a flow from (op_save) to (merge point), at merge point, we can *use* locals that are defined before (op_save)
            2. op_save should claim that it does not define anything. And claim that it *use*s locals that are used in (merge point).
            3. at op_resume, we see *use*d locals at merge point and define all of them.

        We can do the above things in use-def analysis because use-def analysis is backward analysis.
        And after analyzing use-def chains, in op_save / op_resume, we only save / resume live registers at the head of merge point.

        * API/JSScriptRef.cpp:
        (parseScript):
        * CMakeLists.txt:
        * Configurations/FeatureDefines.xcconfig:
        * DerivedSources.make:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * builtins/BuiltinExecutables.cpp:
        (JSC::createExecutableInternal):
        * builtins/GeneratorPrototype.js: Added.
        (generatorResume):
        (next):
        (return):
        (throw):
        * bytecode/BytecodeBasicBlock.cpp:
        (JSC::isBranch):
        * bytecode/BytecodeList.json:
        * bytecode/BytecodeLivenessAnalysis.cpp:
        (JSC::stepOverInstruction):
        (JSC::computeLocalLivenessForBytecodeOffset):
        (JSC::BytecodeLivenessAnalysis::runLivenessFixpoint):
        (JSC::BytecodeLivenessAnalysis::computeFullLiveness):
        (JSC::BytecodeLivenessAnalysis::computeKills):
        * bytecode/BytecodeUseDef.h:
        (JSC::computeUsesForBytecodeOffset):
        (JSC::computeDefsForBytecodeOffset):
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::dumpBytecode):
        (JSC::CodeBlock::CodeBlock):
        (JSC::CodeBlock::finishCreation):
        (JSC::CodeBlock::shrinkToFit):
        (JSC::CodeBlock::validate):
        * bytecode/CodeBlock.h:
        (JSC::CodeBlock::numCalleeLocals):
        (JSC::CodeBlock::liveCalleeLocalsAtYield):
        * bytecode/EvalCodeCache.h:
        (JSC::EvalCodeCache::tryGet):
        (JSC::EvalCodeCache::getSlow):
        (JSC::EvalCodeCache::isCacheable):
        * bytecode/ExecutableInfo.h:
        (JSC::ExecutableInfo::ExecutableInfo):
        (JSC::ExecutableInfo::generatorThisMode):
        (JSC::ExecutableInfo::superBinding):
        (JSC::ExecutableInfo::parseMode):
        (JSC::ExecutableInfo::isArrowFunction): Deleted.
        * bytecode/PreciseJumpTargets.cpp:
        (JSC::getJumpTargetsForBytecodeOffset):
        * bytecode/UnlinkedCodeBlock.cpp:
        (JSC::UnlinkedCodeBlock::UnlinkedCodeBlock):
        * bytecode/UnlinkedCodeBlock.h:
        (JSC::UnlinkedCodeBlock::parseMode):
        (JSC::UnlinkedCodeBlock::generatorThisMode):
        (JSC::UnlinkedCodeBlock::superBinding):
        (JSC::UnlinkedCodeBlock::isArrowFunction): Deleted.
        * bytecode/UnlinkedFunctionExecutable.cpp:
        (JSC::generateUnlinkedFunctionCodeBlock):
        (JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
        (JSC::UnlinkedFunctionExecutable::unlinkedCodeBlockFor):
        * bytecode/UnlinkedFunctionExecutable.h:
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::BytecodeGenerator):
        (JSC::BytecodeGenerator::initializeParameters):
        (JSC::BytecodeGenerator::newRegister):
        (JSC::BytecodeGenerator::reclaimFreeRegisters):
        (JSC::BytecodeGenerator::createVariable):
        (JSC::BytecodeGenerator::emitCreateThis):
        (JSC::BytecodeGenerator::emitNewFunctionExpressionCommon):
        (JSC::BytecodeGenerator::emitNewFunctionExpression):
        (JSC::BytecodeGenerator::emitNewArrowFunctionExpression):
        (JSC::BytecodeGenerator::emitNewFunction):
        (JSC::BytecodeGenerator::emitIteratorNextWithValue):
        (JSC::BytecodeGenerator::emitYieldPoint):
        (JSC::BytecodeGenerator::emitSave):
        (JSC::BytecodeGenerator::emitResume):
        (JSC::BytecodeGenerator::emitYield):
        (JSC::BytecodeGenerator::emitDelegateYield):
        (JSC::BytecodeGenerator::emitGeneratorStateChange):
        (JSC::BytecodeGenerator::emitGeneratorStateLabel):
        (JSC::BytecodeGenerator::beginGenerator):
        (JSC::BytecodeGenerator::endGenerator):
        (JSC::BytecodeGenerator::emitNewFunctionInternal): Deleted.
        (JSC::BytecodeGenerator::emitNewFunctionCommon): Deleted.
        * bytecompiler/BytecodeGenerator.h:
        (JSC::BytecodeGenerator::generatorThisMode):
        (JSC::BytecodeGenerator::superBinding):
        (JSC::BytecodeGenerator::generatorRegister):
        (JSC::BytecodeGenerator::generatorStateRegister):
        (JSC::BytecodeGenerator::generatorValueRegister):
        (JSC::BytecodeGenerator::generatorResumeModeRegister):
        (JSC::BytecodeGenerator::parseMode):
        (JSC::BytecodeGenerator::registerFor):
        (JSC::BytecodeGenerator::makeFunction):
        * bytecompiler/NodesCodegen.cpp:
        (JSC::ThisNode::emitBytecode):
        (JSC::emitHomeObjectForCallee):
        (JSC::emitSuperBaseForCallee):
        (JSC::ReturnNode::emitBytecode):
        (JSC::FunctionNode::emitBytecode):
        (JSC::YieldExprNode::emitBytecode):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::ByteCodeParser):
        (JSC::DFG::ByteCodeParser::inlineCall):
        (JSC::DFG::ByteCodeParser::handleGetById):
        (JSC::DFG::ByteCodeParser::handlePutById):
        * dfg/DFGForAllKills.h:
        (JSC::DFG::forAllKilledOperands):
        * dfg/DFGGraph.h:
        (JSC::DFG::Graph::forAllLocalsLiveInBytecode):
        * dfg/DFGOSREntrypointCreationPhase.cpp:
        (JSC::DFG::OSREntrypointCreationPhase::run):
        * dfg/DFGVariableEventStream.cpp:
        (JSC::DFG::VariableEventStream::reconstruct):
        * ftl/FTLForOSREntryJITCode.cpp:
        (JSC::FTL::ForOSREntryJITCode::initializeEntryBuffer):
        * ftl/FTLForOSREntryJITCode.h:
        * ftl/FTLOSREntry.cpp:
        (JSC::FTL::prepareOSREntry):
        * ftl/FTLState.cpp:
        (JSC::FTL::State::State):
        * heap/MarkedBlock.h:
        (JSC::MarkedBlock::isAtom):
        (JSC::MarkedBlock::isLiveCell):
        * interpreter/Interpreter.cpp:
        (JSC::eval):
        (JSC::Interpreter::dumpRegisters):
        * jit/JIT.cpp:
        (JSC::JIT::privateCompileMainPass):
        (JSC::JIT::frameRegisterCountFor):
        * jit/JIT.h:
        * jit/JITOpcodes.cpp:
        (JSC::JIT::emitNewFuncCommon):
        (JSC::JIT::emit_op_new_func):
        (JSC::JIT::emit_op_new_generator_func):
        (JSC::JIT::emitNewFuncExprCommon):
        (JSC::JIT::emit_op_new_func_exp):
        (JSC::JIT::emit_op_new_generator_func_exp):
        (JSC::JIT::emit_op_save):
        (JSC::JIT::emit_op_resume):
        * jit/JITOperations.cpp:
        (JSC::operationNewFunctionCommon):
        * jit/JITOperations.h:
        * llint/LLIntEntrypoint.cpp:
        (JSC::LLInt::frameRegisterCountFor):
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::traceFunctionPrologue):
        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
        * llint/LLIntSlowPaths.h:
        * llint/LowLevelInterpreter.asm:
        * parser/ASTBuilder.h:
        (JSC::ASTBuilder::createYield):
        (JSC::ASTBuilder::createFunctionMetadata):
        (JSC::ASTBuilder::propagateArgumentsUse):
        * parser/Nodes.cpp:
        (JSC::FunctionMetadataNode::FunctionMetadataNode):
        * parser/Nodes.h:
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::Parser):
        (JSC::Parser<LexerType>::parseInner):
        (JSC::Parser<LexerType>::parseGeneratorFunctionSourceElements):
        (JSC::Parser<LexerType>::parseFunctionBody):
        (JSC::stringForFunctionMode):
        (JSC::Parser<LexerType>::createGeneratorParameters):
        (JSC::Parser<LexerType>::parseFunctionInfo):
        (JSC::Parser<LexerType>::parseFunctionDeclaration):
        (JSC::Parser<LexerType>::parseClass):
        (JSC::Parser<LexerType>::parseAssignmentExpression):
        (JSC::Parser<LexerType>::parseYieldExpression):
        (JSC::Parser<LexerType>::parsePropertyMethod):
        (JSC::Parser<LexerType>::parseFunctionExpression):
        * parser/Parser.h:
        (JSC::Scope::Scope):
        (JSC::Scope::setSourceParseMode):
        (JSC::Scope::hasArguments):
        (JSC::Scope::collectFreeVariables):
        (JSC::Scope::setIsFunction):
        (JSC::Scope::setIsGeneratorFunction):
        (JSC::Scope::setIsGenerator):
        (JSC::parse):
        * parser/ParserModes.h:
        (JSC::isFunctionParseMode):
        (JSC::isModuleParseMode):
        (JSC::isProgramParseMode):
        * parser/SourceCodeKey.h: Added.
        (JSC::SourceCodeKey::SourceCodeKey):
        (JSC::SourceCodeKey::isHashTableDeletedValue):
        (JSC::SourceCodeKey::hash):
        (JSC::SourceCodeKey::length):
        (JSC::SourceCodeKey::isNull):
        (JSC::SourceCodeKey::string):
        (JSC::SourceCodeKey::operator==):
        (JSC::SourceCodeKeyHash::hash):
        (JSC::SourceCodeKeyHash::equal):
        (JSC::SourceCodeKeyHashTraits::isEmptyValue):
        * parser/SyntaxChecker.h:
        (JSC::SyntaxChecker::createYield):
        (JSC::SyntaxChecker::createFunctionMetadata):
        (JSC::SyntaxChecker::operatorStackPop):
        * runtime/CodeCache.cpp:
        (JSC::CodeCache::getGlobalCodeBlock):
        (JSC::CodeCache::getFunctionExecutableFromGlobalCode):
        * runtime/CodeCache.h:
        (JSC::SourceCodeKey::SourceCodeKey): Deleted.
        (JSC::SourceCodeKey::isHashTableDeletedValue): Deleted.
        (JSC::SourceCodeKey::hash): Deleted.
        (JSC::SourceCodeKey::length): Deleted.
        (JSC::SourceCodeKey::isNull): Deleted.
        (JSC::SourceCodeKey::string): Deleted.
        (JSC::SourceCodeKey::operator==): Deleted.
        (JSC::SourceCodeKeyHash::hash): Deleted.
        (JSC::SourceCodeKeyHash::equal): Deleted.
        (JSC::SourceCodeKeyHashTraits::isEmptyValue): Deleted.
        * runtime/CommonIdentifiers.h:
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/CommonSlowPaths.h:
        * runtime/Completion.cpp:
        (JSC::checkSyntax):
        (JSC::checkModuleSyntax):
        * runtime/Executable.cpp:
        (JSC::ScriptExecutable::newCodeBlockFor):
        (JSC::ProgramExecutable::checkSyntax):
        * runtime/Executable.h:
        * runtime/FunctionConstructor.cpp:
        (JSC::constructFunction):
        (JSC::constructFunctionSkippingEvalEnabledCheck):
        * runtime/FunctionConstructor.h:
        * runtime/GeneratorFrame.cpp: Added.
        (JSC::GeneratorFrame::GeneratorFrame):
        (JSC::GeneratorFrame::finishCreation):
        (JSC::GeneratorFrame::createStructure):
        (JSC::GeneratorFrame::create):
        (JSC::GeneratorFrame::save):
        (JSC::GeneratorFrame::resume):
        (JSC::GeneratorFrame::visitChildren):
        * runtime/GeneratorFrame.h: Added.
        (JSC::GeneratorFrame::locals):
        (JSC::GeneratorFrame::localAt):
        (JSC::GeneratorFrame::offsetOfLocals):
        (JSC::GeneratorFrame::allocationSizeForLocals):
        * runtime/GeneratorFunctionConstructor.cpp: Added.
        (JSC::GeneratorFunctionConstructor::GeneratorFunctionConstructor):
        (JSC::GeneratorFunctionConstructor::finishCreation):
        (JSC::callGeneratorFunctionConstructor):
        (JSC::constructGeneratorFunctionConstructor):
        (JSC::GeneratorFunctionConstructor::getCallData):
        (JSC::GeneratorFunctionConstructor::getConstructData):
        * runtime/GeneratorFunctionConstructor.h: Added.
        (JSC::GeneratorFunctionConstructor::create):
        (JSC::GeneratorFunctionConstructor::createStructure):
        * runtime/GeneratorFunctionPrototype.cpp: Added.
        (JSC::GeneratorFunctionPrototype::GeneratorFunctionPrototype):
        (JSC::GeneratorFunctionPrototype::finishCreation):
        * runtime/GeneratorFunctionPrototype.h: Added.
        (JSC::GeneratorFunctionPrototype::create):
        (JSC::GeneratorFunctionPrototype::createStructure):
        * runtime/GeneratorPrototype.cpp: Copied from Source/JavaScriptCore/ftl/FTLForOSREntryJITCode.cpp.
        (JSC::GeneratorPrototype::finishCreation):
        (JSC::GeneratorPrototype::getOwnPropertySlot):
        * runtime/GeneratorPrototype.h: Copied from Source/JavaScriptCore/ftl/FTLForOSREntryJITCode.cpp.
        (JSC::GeneratorPrototype::create):
        (JSC::GeneratorPrototype::createStructure):
        (JSC::GeneratorPrototype::GeneratorPrototype):
        * runtime/GeneratorThisMode.h: Added.
        * runtime/JSFunction.cpp:
        (JSC::JSFunction::getOwnPropertySlot):
        * runtime/JSGeneratorFunction.cpp: Added.
        (JSC::JSGeneratorFunction::JSGeneratorFunction):
        (JSC::JSGeneratorFunction::createImpl):
        (JSC::JSGeneratorFunction::create):
        (JSC::JSGeneratorFunction::createWithInvalidatedReallocationWatchpoint):
        * runtime/JSGeneratorFunction.h: Added.
        (JSC::JSGeneratorFunction::allocationSize):
        (JSC::JSGeneratorFunction::createStructure):
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        (JSC::JSGlobalObject::visitChildren):
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::generatorFunctionPrototype):
        (JSC::JSGlobalObject::generatorPrototype):
        (JSC::JSGlobalObject::generatorFunctionStructure):
        * runtime/ModuleLoaderObject.cpp:
        (JSC::moduleLoaderObjectParseModule):
        * runtime/VM.cpp:
        (JSC::VM::VM):
        * runtime/VM.h:
        * tests/es6.yaml:
        * tests/es6/generators_yield_star_generic_iterables.js:
        (iterator.next):
        (iterable.Symbol.iterator):
        (__createIterableObject):
        * tests/es6/generators_yield_star_instances_of_iterables.js:
        (iterator.next):
        (iterable.Symbol.iterator):
        (__createIterableObject):
        * tests/es6/generators_yield_star_iterator_closing.js:
        (iterator.next):
        (iterable.Symbol.iterator):
        (__createIterableObject):
        * tests/es6/generators_yield_star_iterator_closing_via_throw.js:
        (iterator.next):
        (iterable.Symbol.iterator):
        (__createIterableObject):
        * tests/stress/generator-arguments-from-function.js: Added.
        (shouldBe):
        (test):
        * tests/stress/generator-arguments.js: Added.
        (shouldBe):
        (g1):
        * tests/stress/generator-class-methods-syntax.js: Added.
        (testSyntax):
        (testSyntaxError):
        (testSyntaxError.Cocoa):
        (testSyntax.Cocoa.prototype.ok):
        (testSyntax.Cocoa):
        (testSyntax.Cocoa.ok):
        * tests/stress/generator-class-methods.js: Added.
        (shouldBe):
        (prototype.gen):
        (staticGen):
        (shouldBe.g.next):
        * tests/stress/generator-eval-this.js: Added.
        (shouldBe):
        (shouldThrow):
        (B):
        (A):
        (C.prototype.generator):
        (C):
        (TypeError):
        * tests/stress/generator-function-constructor.js: Added.
        (shouldBe):
        (generatorFunctionConstructor):
        * tests/stress/generator-function-name.js: Added.
        (shouldBe):
        (ok):
        * tests/stress/generator-methods-with-non-generator.js: Added.
        (shouldThrow):
        * tests/stress/generator-relations.js: Added.
        (shouldBe):
        (generatorFunction):
        * tests/stress/generator-return-before-first-call.js: Added.
        (shouldBe):
        (shouldBeIteratorResult):
        * tests/stress/generator-return.js: Added.
        (shouldBe):
        (shouldBeIteratorResult):
        * tests/stress/generator-this.js: Added.
        (shouldBe):
        (shouldThrow):
        (gen):
        (shouldBe.g.next):
        * tests/stress/generator-throw-before-first-call.js: Added.
        (unreachable):
        (gen):
        (catch):
        * tests/stress/generator-throw.js: Added.
        (shouldBe):
        (shouldBeIteratorResult):
        * tests/stress/generator-with-new-target.js: Added.
        (shouldBe):
        (gen):
        * tests/stress/generator-with-super.js: Added.
        (shouldThrow):
        (test):
        (B.prototype.gen):
        (B):
        (A.prototype.gen):
        (A):
        * tests/stress/generator-yield-star.js: Added.
        (shouldBe):
        (shouldThrow):
        (prototype.call):
        (Arrays):
        (Arrays.prototype.Symbol.iterator):
        (Iterator.prototype.next):
        (Iterator.prototype.string_appeared_here):
        (Iterator.prototype.Symbol.iterator):
        (Iterator):
        (gen):

2015-12-01  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r192914.
        https://bugs.webkit.org/show_bug.cgi?id=151734

        JSC tests for this change are failing on 32 and 64-bit bots
        (Requested by ryanhaddad on #webkit).

        Reverted changeset:

        "[ES6] Implement LLInt/Baseline Support for ES6 Generators and
        enable this feature"
        https://bugs.webkit.org/show_bug.cgi?id=150792
        http://trac.webkit.org/changeset/192914

2015-12-01  Caitlin Potter  <caitpotter88@gmail.com>

        [JSC] support CoverInitializedName in nested AssignmentPatterns
        https://bugs.webkit.org/show_bug.cgi?id=151595

        Reviewed by Geoffrey Garen.

        A regression introduced in bug https://bugs.webkit.org/show_bug.cgi?id=151026
        causes the parser to fail when attempting to parse nested
        ObjectAssignmentPatterns with CoverInitializedName destructuring targets.

        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseAssignmentExpressionOrPropagateErrorClass):
        (JSC::Parser<LexerType>::parseAssignmentExpression):
        (JSC::Parser<LexerType>::parseProperty):
        (JSC::Parser<LexerType>::parseArrayLiteral):
        * parser/Parser.h:
        (JSC::Parser::ExpressionErrorClassifier::propagateExpressionErrorClass):
        * tests/es6.yaml:
        * tests/es6/destructuring_assignment_nested_cover_initialized_name.js: Added.
        (test1):
        (test2):

2015-12-01  Juergen Ributzka  <juergen@apple.com>

        Add new library dependency for LLVMForJavaScriptCore dylib
        https://bugs.webkit.org/show_bug.cgi?id=151687
        
        Changes on open source LLVM added a new dependency to libLLVMInstrumentation.a.
        Adding this dependency should be backwards compatible, since LLVM has built and
        shipped this library even before the creation of FTL.

        Reviewed by Geoffrey Garen.

        * Configurations/LLVMForJSC.xcconfig:

2015-12-01  Yusuke Suzuki  <utatane.tea@gmail.com>

        [ES6] Implement LLInt/Baseline Support for ES6 Generators and enable this feature
        https://bugs.webkit.org/show_bug.cgi?id=150792

        Reviewed by Saam Barati.

        This patch implements basic functionality of ES6 Generators in LLInt and Baseline tiers.
        While the implementation has some inefficient part, the implementation covers edge cases.
        Later, we will make this efficient.

            https://bugs.webkit.org/show_bug.cgi?id=151545
            https://bugs.webkit.org/show_bug.cgi?id=151546
            https://bugs.webkit.org/show_bug.cgi?id=151547
            https://bugs.webkit.org/show_bug.cgi?id=151552
            https://bugs.webkit.org/show_bug.cgi?id=151560
            https://bugs.webkit.org/show_bug.cgi?id=151586

        To encourage DFG / FTL later, we take the following design.

        1. Use switch_imm to jump to the save/resume points.

        Instead of saving / restoring instruction pointer to resume from it, we use switch_imm to jump to the resume point.
        This limits one entry point to a given generator function. This design makes inlining easy.
        The generated code becomes the following.

            function @generatorNext(@generator, @generatorState, @generatorValue, @generatorResumeMode)
            {
                switch (@generatorState) {
                case Initial:
                    ...
                    initial sequence.
                    ...


                    op_save(Yield_0);  // op_save contains *virtual* jump to Yield_0.
                                       // CFG shows a jump edge to Yield_0 point, but it won't be actually used.
                    return ...;

                case Yield_0:
                    op_resume();
                    if (@generatorResumeMode == Throw)
                        ...
                    else if (@generatorResumeMode == Return)
                        ...
                    ...
                    // sentValue is a value sent from a caller by `generator.next(sentValue)`.
                    sentValue = @generatorValue;
                    ...
                    op_save(Yield_1);
                    return ...;

                case Yield_1:
                    op_resume();
                    if (@generatorResumeMode == Throw)
                        ...
                    else if (@generatorResumeMode == Return)
                        ...
                    ...
                    sentValue = @generatorValue;
                    ...

                ...
                }
            }

            Resume sequence should not be emitted per yield.
            This should be done in https://bugs.webkit.org/show_bug.cgi?id=151552.

        2. Store live frame registers to GeneratorFrame

        To save and resume generator's state, we save all the live registers in GeneratorFrame.
        And when resuming, we refill registers with saved ones.
        Since saved register contains scope register, |this| etc., the environment including the scope chain will be recovered automatically.
        While saving and resuming callee registers, we don't save parameter registers.
        These registers will be used to control generator's resume behavior.

        We perform BytecodeLivenessAnalysis in CodeBlock to determine actually *def*ined registers at that resume point.

        3. GeneratorFunction will evaluate parameters before generating Generator

        Generator's parameter should be evaluated before entering Generator's body. For example,

            function hello() { ... }
            function *gen(a, b = hello())
            {
                yield b;
            }
            let g = gen(20);  // Now, hello should be called.

        To enable this, we evaluate parameters in GeneratorFunction, and after that, we create a Generator and return it.
        This can be explained by the following pseudo code.

            function *gen(a, b = hello())
            {
                // This is generator.
                return {
                    @generatorNext: function (@generator, @generatorState, @generatorValue, @generatorResumeMode)
                    {
                        ...
                    }
                }
            }

        4. op_save seems similar to conditional jump

        We won't jump to elsewhere from op_save actually. But we add a *virtual* jump edge (flow) from op_save to the point so called *merge point*.
        We construct the CFG as follows,

            (global generator switch) -> (initial sequence) -> (op_save) ----+-> (merge point) -> (next sequence)*
                   |                                              |          |
                   |                                              v          |
                   |                                           (op_ret)      |
                   |                                                         |
                   +------------------------------------------->(op_resume)--+

        By constructing such a graph,

            1. Since we have a flow from (op_save) to (merge point), at merge point, we can *use* locals that are defined before (op_save)
            2. op_save should claim that it does not define anything. And claim that it *use*s locals that are used in (merge point).
            3. at op_resume, we see *use*d locals at merge point and define all of them.

        We can do the above things in use-def analysis because use-def analysis is backward analysis.
        And after analyzing use-def chains, in op_save / op_resume, we only save / resume live registers at the head of merge point.

        * API/JSScriptRef.cpp:
        (parseScript):
        * CMakeLists.txt:
        * Configurations/FeatureDefines.xcconfig:
        * DerivedSources.make:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * builtins/BuiltinExecutables.cpp:
        (JSC::createExecutableInternal):
        * builtins/GeneratorPrototype.js: Added.
        (generatorResume):
        (next):
        (return):
        (throw):
        * bytecode/BytecodeBasicBlock.cpp:
        (JSC::isBranch):
        * bytecode/BytecodeList.json:
        * bytecode/BytecodeLivenessAnalysis.cpp:
        (JSC::stepOverInstruction):
        (JSC::computeLocalLivenessForBytecodeOffset):
        (JSC::BytecodeLivenessAnalysis::runLivenessFixpoint):
        (JSC::BytecodeLivenessAnalysis::computeFullLiveness):
        (JSC::BytecodeLivenessAnalysis::computeKills):
        * bytecode/BytecodeUseDef.h:
        (JSC::computeUsesForBytecodeOffset):
        (JSC::computeDefsForBytecodeOffset):
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::dumpBytecode):
        (JSC::CodeBlock::CodeBlock):
        (JSC::CodeBlock::finishCreation):
        (JSC::CodeBlock::shrinkToFit):
        (JSC::CodeBlock::validate):
        * bytecode/CodeBlock.h:
        (JSC::CodeBlock::numCalleeLocals):
        (JSC::CodeBlock::liveCalleeLocalsAtYield):
        * bytecode/EvalCodeCache.h:
        (JSC::EvalCodeCache::tryGet):
        (JSC::EvalCodeCache::getSlow):
        (JSC::EvalCodeCache::isCacheable):
        * bytecode/ExecutableInfo.h:
        (JSC::ExecutableInfo::ExecutableInfo):
        (JSC::ExecutableInfo::generatorThisMode):
        (JSC::ExecutableInfo::superBinding):
        (JSC::ExecutableInfo::parseMode):
        (JSC::ExecutableInfo::isArrowFunction): Deleted.
        * bytecode/PreciseJumpTargets.cpp:
        (JSC::getJumpTargetsForBytecodeOffset):
        * bytecode/UnlinkedCodeBlock.cpp:
        (JSC::UnlinkedCodeBlock::UnlinkedCodeBlock):
        * bytecode/UnlinkedCodeBlock.h:
        (JSC::UnlinkedCodeBlock::parseMode):
        (JSC::UnlinkedCodeBlock::generatorThisMode):
        (JSC::UnlinkedCodeBlock::superBinding):
        (JSC::UnlinkedCodeBlock::isArrowFunction): Deleted.
        * bytecode/UnlinkedFunctionExecutable.cpp:
        (JSC::generateUnlinkedFunctionCodeBlock):
        (JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
        (JSC::UnlinkedFunctionExecutable::unlinkedCodeBlockFor):
        * bytecode/UnlinkedFunctionExecutable.h:
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::BytecodeGenerator):
        (JSC::BytecodeGenerator::initializeParameters):
        (JSC::BytecodeGenerator::newRegister):
        (JSC::BytecodeGenerator::reclaimFreeRegisters):
        (JSC::BytecodeGenerator::createVariable):
        (JSC::BytecodeGenerator::emitCreateThis):
        (JSC::BytecodeGenerator::emitNewFunctionExpressionCommon):
        (JSC::BytecodeGenerator::emitNewFunctionExpression):
        (JSC::BytecodeGenerator::emitNewArrowFunctionExpression):
        (JSC::BytecodeGenerator::emitNewFunction):
        (JSC::BytecodeGenerator::emitIteratorNextWithValue):
        (JSC::BytecodeGenerator::emitYieldPoint):
        (JSC::BytecodeGenerator::emitSave):
        (JSC::BytecodeGenerator::emitResume):
        (JSC::BytecodeGenerator::emitYield):
        (JSC::BytecodeGenerator::emitDelegateYield):
        (JSC::BytecodeGenerator::emitGeneratorStateChange):
        (JSC::BytecodeGenerator::emitGeneratorStateLabel):
        (JSC::BytecodeGenerator::beginGenerator):
        (JSC::BytecodeGenerator::endGenerator):
        (JSC::BytecodeGenerator::emitNewFunctionInternal): Deleted.
        (JSC::BytecodeGenerator::emitNewFunctionCommon): Deleted.
        * bytecompiler/BytecodeGenerator.h:
        (JSC::BytecodeGenerator::generatorThisMode):
        (JSC::BytecodeGenerator::superBinding):
        (JSC::BytecodeGenerator::generatorRegister):
        (JSC::BytecodeGenerator::generatorStateRegister):
        (JSC::BytecodeGenerator::generatorValueRegister):
        (JSC::BytecodeGenerator::generatorResumeModeRegister):
        (JSC::BytecodeGenerator::parseMode):
        (JSC::BytecodeGenerator::registerFor):
        (JSC::BytecodeGenerator::makeFunction):
        * bytecompiler/NodesCodegen.cpp:
        (JSC::ThisNode::emitBytecode):
        (JSC::emitHomeObjectForCallee):
        (JSC::emitSuperBaseForCallee):
        (JSC::ReturnNode::emitBytecode):
        (JSC::FunctionNode::emitBytecode):
        (JSC::YieldExprNode::emitBytecode):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::ByteCodeParser):
        (JSC::DFG::ByteCodeParser::inlineCall):
        (JSC::DFG::ByteCodeParser::handleGetById):
        (JSC::DFG::ByteCodeParser::handlePutById):
        * dfg/DFGForAllKills.h:
        (JSC::DFG::forAllKilledOperands):
        * dfg/DFGGraph.h:
        (JSC::DFG::Graph::forAllLocalsLiveInBytecode):
        * dfg/DFGOSREntrypointCreationPhase.cpp:
        (JSC::DFG::OSREntrypointCreationPhase::run):
        * dfg/DFGVariableEventStream.cpp:
        (JSC::DFG::VariableEventStream::reconstruct):
        * ftl/FTLForOSREntryJITCode.cpp:
        (JSC::FTL::ForOSREntryJITCode::initializeEntryBuffer):
        * ftl/FTLForOSREntryJITCode.h:
        * ftl/FTLOSREntry.cpp:
        (JSC::FTL::prepareOSREntry):
        * ftl/FTLState.cpp:
        (JSC::FTL::State::State):
        * heap/MarkedBlock.h:
        (JSC::MarkedBlock::isAtom):
        (JSC::MarkedBlock::isLiveCell):
        * interpreter/Interpreter.cpp:
        (JSC::eval):
        (JSC::Interpreter::dumpRegisters):
        * jit/JIT.cpp:
        (JSC::JIT::privateCompileMainPass):
        (JSC::JIT::frameRegisterCountFor):
        * jit/JIT.h:
        * jit/JITOpcodes.cpp:
        (JSC::JIT::emitNewFuncCommon):
        (JSC::JIT::emit_op_new_func):
        (JSC::JIT::emit_op_new_generator_func):
        (JSC::JIT::emitNewFuncExprCommon):
        (JSC::JIT::emit_op_new_func_exp):
        (JSC::JIT::emit_op_new_generator_func_exp):
        (JSC::JIT::emit_op_save):
        (JSC::JIT::emit_op_resume):
        * jit/JITOperations.cpp:
        (JSC::operationNewFunctionCommon):
        * jit/JITOperations.h:
        * llint/LLIntEntrypoint.cpp:
        (JSC::LLInt::frameRegisterCountFor):
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::traceFunctionPrologue):
        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
        * llint/LLIntSlowPaths.h:
        * llint/LowLevelInterpreter.asm:
        * parser/ASTBuilder.h:
        (JSC::ASTBuilder::createYield):
        (JSC::ASTBuilder::createFunctionMetadata):
        (JSC::ASTBuilder::propagateArgumentsUse):
        * parser/Nodes.cpp:
        (JSC::FunctionMetadataNode::FunctionMetadataNode):
        * parser/Nodes.h:
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::Parser):
        (JSC::Parser<LexerType>::parseInner):
        (JSC::Parser<LexerType>::parseGeneratorFunctionSourceElements):
        (JSC::Parser<LexerType>::parseFunctionBody):
        (JSC::stringForFunctionMode):
        (JSC::Parser<LexerType>::createGeneratorParameters):
        (JSC::Parser<LexerType>::parseFunctionInfo):
        (JSC::Parser<LexerType>::parseFunctionDeclaration):
        (JSC::Parser<LexerType>::parseClass):
        (JSC::Parser<LexerType>::parseAssignmentExpression):
        (JSC::Parser<LexerType>::parseYieldExpression):
        (JSC::Parser<LexerType>::parsePropertyMethod):
        (JSC::Parser<LexerType>::parseFunctionExpression):
        * parser/Parser.h:
        (JSC::Scope::Scope):
        (JSC::Scope::setSourceParseMode):
        (JSC::Scope::hasArguments):
        (JSC::Scope::collectFreeVariables):
        (JSC::Scope::setIsFunction):
        (JSC::Scope::setIsGeneratorFunction):
        (JSC::Scope::setIsGenerator):
        (JSC::parse):
        * parser/ParserModes.h:
        (JSC::isFunctionParseMode):
        (JSC::isModuleParseMode):
        (JSC::isProgramParseMode):
        * parser/SourceCodeKey.h: Added.
        (JSC::SourceCodeKey::SourceCodeKey):
        (JSC::SourceCodeKey::isHashTableDeletedValue):
        (JSC::SourceCodeKey::hash):
        (JSC::SourceCodeKey::length):
        (JSC::SourceCodeKey::isNull):
        (JSC::SourceCodeKey::string):
        (JSC::SourceCodeKey::operator==):
        (JSC::SourceCodeKeyHash::hash):
        (JSC::SourceCodeKeyHash::equal):
        (JSC::SourceCodeKeyHashTraits::isEmptyValue):
        * parser/SyntaxChecker.h:
        (JSC::SyntaxChecker::createYield):
        (JSC::SyntaxChecker::createFunctionMetadata):
        (JSC::SyntaxChecker::operatorStackPop):
        * runtime/CodeCache.cpp:
        (JSC::CodeCache::getGlobalCodeBlock):
        (JSC::CodeCache::getFunctionExecutableFromGlobalCode):
        * runtime/CodeCache.h:
        (JSC::SourceCodeKey::SourceCodeKey): Deleted.
        (JSC::SourceCodeKey::isHashTableDeletedValue): Deleted.
        (JSC::SourceCodeKey::hash): Deleted.
        (JSC::SourceCodeKey::length): Deleted.
        (JSC::SourceCodeKey::isNull): Deleted.
        (JSC::SourceCodeKey::string): Deleted.
        (JSC::SourceCodeKey::operator==): Deleted.
        (JSC::SourceCodeKeyHash::hash): Deleted.
        (JSC::SourceCodeKeyHash::equal): Deleted.
        (JSC::SourceCodeKeyHashTraits::isEmptyValue): Deleted.
        * runtime/CommonIdentifiers.h:
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/CommonSlowPaths.h:
        * runtime/Completion.cpp:
        (JSC::checkSyntax):
        (JSC::checkModuleSyntax):
        * runtime/Executable.cpp:
        (JSC::ScriptExecutable::newCodeBlockFor):
        (JSC::ProgramExecutable::checkSyntax):
        * runtime/Executable.h:
        * runtime/FunctionConstructor.cpp:
        (JSC::constructFunction):
        (JSC::constructFunctionSkippingEvalEnabledCheck):
        * runtime/FunctionConstructor.h:
        * runtime/GeneratorFrame.cpp: Added.
        (JSC::GeneratorFrame::GeneratorFrame):
        (JSC::GeneratorFrame::finishCreation):
        (JSC::GeneratorFrame::createStructure):
        (JSC::GeneratorFrame::create):
        (JSC::GeneratorFrame::save):
        (JSC::GeneratorFrame::resume):
        (JSC::GeneratorFrame::visitChildren):
        * runtime/GeneratorFrame.h: Added.
        (JSC::GeneratorFrame::locals):
        (JSC::GeneratorFrame::localAt):
        (JSC::GeneratorFrame::offsetOfLocals):
        (JSC::GeneratorFrame::allocationSizeForLocals):
        * runtime/GeneratorFunctionConstructor.cpp: Added.
        (JSC::GeneratorFunctionConstructor::GeneratorFunctionConstructor):
        (JSC::GeneratorFunctionConstructor::finishCreation):
        (JSC::callGeneratorFunctionConstructor):
        (JSC::constructGeneratorFunctionConstructor):
        (JSC::GeneratorFunctionConstructor::getCallData):
        (JSC::GeneratorFunctionConstructor::getConstructData):
        * runtime/GeneratorFunctionConstructor.h: Added.
        (JSC::GeneratorFunctionConstructor::create):
        (JSC::GeneratorFunctionConstructor::createStructure):
        * runtime/GeneratorFunctionPrototype.cpp: Added.
        (JSC::GeneratorFunctionPrototype::GeneratorFunctionPrototype):
        (JSC::GeneratorFunctionPrototype::finishCreation):
        * runtime/GeneratorFunctionPrototype.h: Added.
        (JSC::GeneratorFunctionPrototype::create):
        (JSC::GeneratorFunctionPrototype::createStructure):
        * runtime/GeneratorPrototype.cpp: Copied from Source/JavaScriptCore/ftl/FTLForOSREntryJITCode.cpp.
        (JSC::GeneratorPrototype::finishCreation):
        (JSC::GeneratorPrototype::getOwnPropertySlot):
        * runtime/GeneratorPrototype.h: Copied from Source/JavaScriptCore/ftl/FTLForOSREntryJITCode.cpp.
        (JSC::GeneratorPrototype::create):
        (JSC::GeneratorPrototype::createStructure):
        (JSC::GeneratorPrototype::GeneratorPrototype):
        * runtime/GeneratorThisMode.h: Added.
        * runtime/JSFunction.cpp:
        (JSC::JSFunction::getOwnPropertySlot):
        * runtime/JSGeneratorFunction.cpp: Added.
        (JSC::JSGeneratorFunction::JSGeneratorFunction):
        (JSC::JSGeneratorFunction::createImpl):
        (JSC::JSGeneratorFunction::create):
        (JSC::JSGeneratorFunction::createWithInvalidatedReallocationWatchpoint):
        * runtime/JSGeneratorFunction.h: Added.
        (JSC::JSGeneratorFunction::allocationSize):
        (JSC::JSGeneratorFunction::createStructure):
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        (JSC::JSGlobalObject::visitChildren):
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::generatorFunctionPrototype):
        (JSC::JSGlobalObject::generatorPrototype):
        (JSC::JSGlobalObject::generatorFunctionStructure):
        * runtime/ModuleLoaderObject.cpp:
        (JSC::moduleLoaderObjectParseModule):
        * runtime/VM.cpp:
        (JSC::VM::VM):
        * runtime/VM.h:
        * tests/es6.yaml:
        * tests/es6/generators_yield_star_generic_iterables.js:
        (iterator.next):
        (iterable.Symbol.iterator):
        (__createIterableObject):
        * tests/es6/generators_yield_star_instances_of_iterables.js:
        (iterator.next):
        (iterable.Symbol.iterator):
        (__createIterableObject):
        * tests/es6/generators_yield_star_iterator_closing.js:
        (iterator.next):
        (iterable.Symbol.iterator):
        (__createIterableObject):
        * tests/es6/generators_yield_star_iterator_closing_via_throw.js:
        (iterator.next):
        (iterable.Symbol.iterator):
        (__createIterableObject):
        * tests/stress/generator-arguments-from-function.js: Added.
        (shouldBe):
        (test):
        * tests/stress/generator-arguments.js: Added.
        (shouldBe):
        (g1):
        * tests/stress/generator-class-methods-syntax.js: Added.
        (testSyntax):
        (testSyntaxError):
        (testSyntaxError.Cocoa):
        (testSyntax.Cocoa.prototype.ok):
        (testSyntax.Cocoa):
        (testSyntax.Cocoa.ok):
        * tests/stress/generator-class-methods.js: Added.
        (shouldBe):
        (prototype.gen):
        (staticGen):
        (shouldBe.g.next):
        * tests/stress/generator-eval-this.js: Added.
        (shouldBe):
        (shouldThrow):
        (B):
        (A):
        (C.prototype.generator):
        (C):
        (TypeError):
        * tests/stress/generator-function-constructor.js: Added.
        (shouldBe):
        (generatorFunctionConstructor):
        * tests/stress/generator-function-name.js: Added.
        (shouldBe):
        (ok):
        * tests/stress/generator-methods-with-non-generator.js: Added.
        (shouldThrow):
        * tests/stress/generator-relations.js: Added.
        (shouldBe):
        (generatorFunction):
        * tests/stress/generator-return-before-first-call.js: Added.
        (shouldBe):
        (shouldBeIteratorResult):
        * tests/stress/generator-return.js: Added.
        (shouldBe):
        (shouldBeIteratorResult):
        * tests/stress/generator-this.js: Added.
        (shouldBe):
        (shouldThrow):
        (gen):
        (shouldBe.g.next):
        * tests/stress/generator-throw-before-first-call.js: Added.
        (unreachable):
        (gen):
        (catch):
        * tests/stress/generator-throw.js: Added.
        (shouldBe):
        (shouldBeIteratorResult):
        * tests/stress/generator-with-new-target.js: Added.
        (shouldBe):
        (gen):
        * tests/stress/generator-with-super.js: Added.
        (shouldThrow):
        (test):
        (B.prototype.gen):
        (B):
        (A.prototype.gen):
        (A):
        * tests/stress/generator-yield-star.js: Added.
        (shouldBe):
        (shouldThrow):
        (prototype.call):
        (Arrays):
        (Arrays.prototype.Symbol.iterator):
        (Iterator.prototype.next):
        (Iterator.prototype.string_appeared_here):
        (Iterator.prototype.Symbol.iterator):
        (Iterator):
        (gen):

2015-12-01  Filip Pizlo  <fpizlo@apple.com>

        Remove repetitive cruft from FTL OSR exit code in LowerDFGToLLVM
        https://bugs.webkit.org/show_bug.cgi?id=151718

        Reviewed by Geoffrey Garen.

        * b3/B3StackmapValue.h:
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileInvalidationPoint):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExitArgumentsForPatchpointIfWillCatchException):
        (JSC::FTL::DFG::LowerDFGToLLVM::lowBlock):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExitDescriptor):
        (JSC::FTL::DFG::LowerDFGToLLVM::appendOSRExit):
        (JSC::FTL::DFG::LowerDFGToLLVM::blessSpeculation):
        (JSC::FTL::DFG::LowerDFGToLLVM::emitOSRExitCall):
        (JSC::FTL::DFG::LowerDFGToLLVM::buildExitArguments):
        (JSC::FTL::DFG::LowerDFGToLLVM::callStackmap):

2015-12-01  Caitlin Potter  <caitp@igalia.com>

        [JSC] add missing RequireObjectCoercible() step in destructuring
        https://bugs.webkit.org/show_bug.cgi?id=151596

        Reviewed by Darin Adler.

        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitRequireObjectCoercible):
        * bytecompiler/BytecodeGenerator.h:
        * bytecompiler/NodesCodegen.cpp:
        (JSC::ObjectPatternNode::bindValue):
        * tests/stress/destructuring-assignment-require-object-coercible.js: Added.
        (testTypeError):
        (testOK):

2015-12-01  Mark Lam  <mark.lam@apple.com>

        Refactor FTL sub snippet code to support general binary op snippets.
        https://bugs.webkit.org/show_bug.cgi?id=151706

        Reviewed by Geoffrey Garen.

        * CMakeLists.txt:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
        * JavaScriptCore.xcodeproj/project.pbxproj:

        * ftl/FTLCompile.cpp:
        - Moved the BinarySnippetRegisterContext to FTLCompileBinaryOp.cpp verbatim.
        - Generalize generateArithSubICFastPath() to generateBinaryOpICFastPath().
          It now uses snippet specific helpers in FTLCompileBinaryOp.cpp to generate
          the fast paths.

        * ftl/FTLCompileBinaryOp.cpp: Added.
        (JSC::FTL::BinarySnippetRegisterContext::BinarySnippetRegisterContext):
        (JSC::FTL::BinarySnippetRegisterContext::initializeRegisters):
        (JSC::FTL::BinarySnippetRegisterContext::restoreRegisters):
        - Moved here without changed from FTLCompile.cpp.
        (JSC::FTL::generateArithSubFastPath):
        * ftl/FTLCompileBinaryOp.h: Added.

        * ftl/FTLInlineCacheDescriptor.h:
        (JSC::FTL::BinaryOpDescriptor::nodeType):
        (JSC::FTL::BinaryOpDescriptor::size):
        (JSC::FTL::BinaryOpDescriptor::name):
        (JSC::FTL::BinaryOpDescriptor::fastPathICName):
        (JSC::FTL::BinaryOpDescriptor::slowPathFunction):
        (JSC::FTL::BinaryOpDescriptor::leftOperand):
        (JSC::FTL::BinaryOpDescriptor::rightOperand):
        (JSC::FTL::BinaryOpDescriptor::BinaryOpDescriptor):
        (JSC::FTL::ArithSubDescriptor::ArithSubDescriptor): Deleted.
        (JSC::FTL::ArithSubDescriptor::leftType): Deleted.
        (JSC::FTL::ArithSubDescriptor::rightType): Deleted.
        - Refactor ArithSubDescriptor into BinaryOpDescriptor, and re-add a sub-class
          ArithSubDescriptor as specializations of BinaryOpDescriptor.

        * ftl/FTLInlineCacheDescriptorInlines.h: Added.
        (JSC::FTL::ArithSubDescriptor::ArithSubDescriptor):
        (JSC::FTL::ArithSubDescriptor::icSize):

        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileArithAddOrSub):
        * ftl/FTLOSRExit.cpp:
        (JSC::FTL::OSRExit::willArriveAtExitFromIndirectExceptionCheck):
        (JSC::FTL::OSRExit::willArriveAtOSRExitFromCallOperation):
        * ftl/FTLOSRExit.h:
        * ftl/FTLState.h:

2015-12-01  Carlos Garcia Campos  <cgarcia@igalia.com>

        Unreviewed, rolling out r192876.

        It broke a lot of JSC and layout tests for GTK and EFL

        Reverted changeset:

        "[ES6] "super" and "this" should be lexically bound inside an
        arrow function and should live in a JSLexicalEnvironment"
        https://bugs.webkit.org/show_bug.cgi?id=149338
        http://trac.webkit.org/changeset/192876

2015-12-01 Aleksandr Skachkov   <gskachkov@gmail.com>

        [ES6] "super" and "this" should be lexically bound inside an arrow function and should live in a JSLexicalEnvironment
        https://bugs.webkit.org/show_bug.cgi?id=149338

        Reviewed by Saam Barati.

        Implemented new version of the lexically bound 'this' in arrow function. In current version 
        'this' is stored inside of the lexical environment of the function. To store and load we use
        op_get_from_scope and op_put_to_scope operations. Also new implementation prevent raising TDZ
        error for arrow functions that are declared before super() but invoke after.

        * builtins/BuiltinExecutables.cpp:
        (JSC::createExecutableInternal):
        * bytecode/BytecodeList.json:
        * bytecode/BytecodeUseDef.h:
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::dumpBytecode):
        * bytecode/EvalCodeCache.h:
        (JSC::EvalCodeCache::getSlow):
        * bytecode/ExecutableInfo.h:
        (JSC::ExecutableInfo::ExecutableInfo):
        (JSC::ExecutableInfo::isDerivedConstructorContext):
        (JSC::ExecutableInfo::isArrowFunctionContext):
        * bytecode/UnlinkedCodeBlock.cpp:
        (JSC::UnlinkedCodeBlock::UnlinkedCodeBlock):
        * bytecode/UnlinkedCodeBlock.h:
        (JSC::UnlinkedCodeBlock::isDerivedConstructorContext):
        (JSC::UnlinkedCodeBlock::isArrowFunctionContext):
        * bytecode/UnlinkedFunctionExecutable.cpp:
        (JSC::generateUnlinkedFunctionCodeBlock):
        (JSC::UnlinkedFunctionExecutable::UnlinkedFunctionExecutable):
        * bytecode/UnlinkedFunctionExecutable.h:
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::BytecodeGenerator):
        (JSC::BytecodeGenerator::initializeArrowFunctionContextScopeIfNeeded):
        (JSC::BytecodeGenerator::variable):
        (JSC::BytecodeGenerator::emitLoadArrowFunctionLexicalEnvironment):
        (JSC::BytecodeGenerator::emitLoadThisFromArrowFunctionLexicalEnvironment):
        (JSC::BytecodeGenerator::emitLoadNewTargetFromArrowFunctionLexicalEnvironment):
        (JSC::BytecodeGenerator::emitLoadDerivedConstructorFromArrowFunctionLexicalEnvironment):
        (JSC::BytecodeGenerator::emitPutNewTargetToArrowFunctionContextScope):
        (JSC::BytecodeGenerator::emitPutDerivedConstructorToArrowFunctionContextScope):
        (JSC::BytecodeGenerator::emitPutThisToArrowFunctionContextScope):
        * bytecompiler/BytecodeGenerator.h:
        (JSC::BytecodeGenerator::isDerivedConstructorContext):
        (JSC::BytecodeGenerator::usesArrowFunction):
        (JSC::BytecodeGenerator::needsToUpdateArrowFunctionContext):
        (JSC::BytecodeGenerator::usesEval):
        (JSC::BytecodeGenerator::usesThis):
        (JSC::BytecodeGenerator::newTarget):
        (JSC::BytecodeGenerator::makeFunction):
        * bytecompiler/NodesCodegen.cpp:
        (JSC::ThisNode::emitBytecode):
        (JSC::SuperNode::emitBytecode):
        (JSC::EvalFunctionCallNode::emitBytecode):
        (JSC::FunctionCallValueNode::emitBytecode):
        (JSC::FunctionNode::emitBytecode):
        * debugger/DebuggerCallFrame.cpp:
        (JSC::DebuggerCallFrame::evaluate):
        * dfg/DFGAbstractInterpreterInlines.h:
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::parseBlock):
        * dfg/DFGCapabilities.cpp:
        * dfg/DFGClobberize.h:
        * dfg/DFGDoesGC.cpp:
        * dfg/DFGFixupPhase.cpp:
        * dfg/DFGNodeType.h:
        * dfg/DFGObjectAllocationSinkingPhase.cpp:
        * dfg/DFGPredictionPropagationPhase.cpp:
        * dfg/DFGPromotedHeapLocation.cpp:
        * dfg/DFGPromotedHeapLocation.h:
        * dfg/DFGSafeToExecute.h:
        * dfg/DFGSpeculativeJIT.cpp:
        * dfg/DFGSpeculativeJIT.h:
        * dfg/DFGSpeculativeJIT32_64.cpp:
        * dfg/DFGSpeculativeJIT64.cpp:
        * ftl/FTLCapabilities.cpp:
        * ftl/FTLLowerDFGToLLVM.cpp:
        * ftl/FTLOperations.cpp:
        (JSC::FTL::operationMaterializeObjectInOSR):
        * interpreter/Interpreter.cpp:
        (JSC::eval):
        * jit/JIT.cpp:
        * jit/JIT.h:
        * jit/JITOpcodes.cpp:
        (JSC::JIT::emitNewFuncExprCommon):
        * jit/JITOpcodes32_64.cpp:
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
        * llint/LowLevelInterpreter.asm:
        * llint/LowLevelInterpreter32_64.asm:
        * llint/LowLevelInterpreter64.asm:
        * parser/ASTBuilder.h:
        (JSC::ASTBuilder::createArrowFunctionExpr):
        (JSC::ASTBuilder::usesArrowFunction):
        * parser/Nodes.h:
        (JSC::ScopeNode::usesArrowFunction):
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseFunctionInfo):
        * parser/ParserModes.h:
        * runtime/CodeCache.cpp:
        (JSC::CodeCache::getGlobalCodeBlock):
        (JSC::CodeCache::getProgramCodeBlock):
        (JSC::CodeCache::getEvalCodeBlock):
        (JSC::CodeCache::getModuleProgramCodeBlock):
        (JSC::CodeCache::getFunctionExecutableFromGlobalCode):
        * runtime/CodeCache.h:
        * runtime/CommonIdentifiers.h:
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/Executable.cpp:
        (JSC::ScriptExecutable::ScriptExecutable):
        (JSC::EvalExecutable::create):
        (JSC::EvalExecutable::EvalExecutable):
        (JSC::ProgramExecutable::ProgramExecutable):
        (JSC::ModuleProgramExecutable::ModuleProgramExecutable):
        (JSC::FunctionExecutable::FunctionExecutable):
        * runtime/Executable.h:
        (JSC::ScriptExecutable::isArrowFunctionContext):
        (JSC::ScriptExecutable::isDerivedConstructorContext):
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::createEvalCodeBlock):
        * runtime/JSGlobalObject.h:
        * runtime/JSGlobalObjectFunctions.cpp:
        (JSC::globalFuncEval):
        * tests/es6.yaml:
        * tests/stress/arrowfunction-activation-sink-osrexit.js:
        * tests/stress/arrowfunction-activation-sink.js:
        * tests/stress/arrowfunction-lexical-bind-newtarget.js: Added.
        * tests/stress/arrowfunction-lexical-bind-supercall-1.js: Added.
        * tests/stress/arrowfunction-lexical-bind-supercall-2.js: Added.
        * tests/stress/arrowfunction-lexical-bind-supercall-3.js: Added.
        * tests/stress/arrowfunction-lexical-bind-supercall-4.js: Added.
        * tests/stress/arrowfunction-lexical-bind-this-1.js:
        * tests/stress/arrowfunction-lexical-bind-this-7.js: Added.
        * tests/stress/arrowfunction-tdz-1.js: Added.
        * tests/stress/arrowfunction-tdz-2.js: Added.
        * tests/stress/arrowfunction-tdz-3.js: Added.
        * tests/stress/arrowfunction-tdz-4.js: Added.
        * tests/stress/arrowfunction-tdz.js: Removed.

2015-12-01  Youenn Fablet  <youenn.fablet@crf.canon.fr>

        [Streams API] streams should not directly use Number and related methods
        https://bugs.webkit.org/show_bug.cgi?id=151499

        Reviewed by Darin Adler.

        * runtime/CommonIdentifiers.h: Adding isNaN as private symbol.
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init): Adding @isNaN function.

2015-12-01  Csaba Osztrogonác  <ossy@webkit.org>

        Don't hide the argument name inside for block in AirIteratedRegisterCoalescing.cpp
        https://bugs.webkit.org/show_bug.cgi?id=151622

        Reviewed by Darin Adler.

        * b3/air/AirIteratedRegisterCoalescing.cpp:
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::addEdges):

2015-12-01  Youenn Fablet  <youenn.fablet@crf.canon.fr>

        [Streams API] Remove use of @catch for exposed promises
        https://bugs.webkit.org/show_bug.cgi?id=151625

        Reviewed by Darin Adler.

        * runtime/JSPromisePrototype.cpp:
        (JSC::JSPromisePrototype::addOwnInternalSlots): Removing @catch from the prototype as it is not safe.

2015-11-30  Filip Pizlo  <fpizlo@apple.com>

        B3::ValueRep::Any should translate into a Arg::ColdUse role in Air
        https://bugs.webkit.org/show_bug.cgi?id=151174

        Reviewed by Geoffrey Garen and Benjamin Poulain.

        This teaches the register allocator that it should pick spills based on whichever tmp has the
        highest score:

            score(tmp) = degree(tmp) / sum(for each use of tmp, block->frequency)

        In other words, the numerator is the number of edges in the inteference graph and the denominator
        is an estimate of the dynamic number of uses.

        This also extends Arg::Role to know that there is such a thing as ColdUse, i.e. a Use that
        doesn't count as such for the above formula. Because LateUse is always used in contexts where we
        want it to be Cold, I've defined LateUse to imply ColdUse.

        This gets rid of all spilling inside the hot loop in Kraken/imaging-gaussian-blur. But more
        importantly, it makes our register allocator use a well-known heuristic based on reusable
        building blocks like the new Air::UseCounts. Even if the heuristic is slightly wrong, the right
        heuristic probably uses the same building blocks.

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/B3StackmapSpecial.cpp:
        (JSC::B3::StackmapSpecial::forEachArgImpl):
        * b3/B3ValueRep.h:
        * b3/air/AirArg.cpp:
        (WTF::printInternal):
        * b3/air/AirArg.h:
        (JSC::B3::Air::Arg::isAnyUse):
        (JSC::B3::Air::Arg::isColdUse):
        (JSC::B3::Air::Arg::isWarmUse):
        (JSC::B3::Air::Arg::isEarlyUse):
        (JSC::B3::Air::Arg::isDef):
        * b3/air/AirIteratedRegisterCoalescing.cpp:
        (JSC::B3::Air::iteratedRegisterCoalescing):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::IteratedRegisterCoalescingAllocator): Deleted.
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::allocatedReg): Deleted.
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::tmpArraySize): Deleted.
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::initializeDegrees): Deleted.
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::build): Deleted.
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::selectSpill): Deleted.
        (JSC::B3::Air::isUselessMoveInst): Deleted.
        (JSC::B3::Air::assignRegisterToTmpInProgram): Deleted.
        (JSC::B3::Air::addSpillAndFillToProgram): Deleted.
        (JSC::B3::Air::iteratedRegisterCoalescingOnType): Deleted.
        * b3/air/AirLiveness.h:
        * b3/air/AirSpillEverything.cpp:
        (JSC::B3::Air::spillEverything):
        * b3/air/AirUseCounts.h: Added.
        (JSC::B3::Air::UseCounts::Counts::dump):
        (JSC::B3::Air::UseCounts::UseCounts):
        (JSC::B3::Air::UseCounts::operator[]):
        (JSC::B3::Air::UseCounts::dump):
        * runtime/Options.h:

2015-11-30  Csaba Osztrogonác  <ossy@webkit.org>

        Fix the !ENABLE(DFG_JIT) build after r192699
        https://bugs.webkit.org/show_bug.cgi?id=151616

        Reviewed by Darin Adler.

        * assembler/MacroAssembler.h:

2015-11-30  Yusuke Suzuki  <utatane.tea@gmail.com>

        Object::{freeze, seal} perform preventExtensionsTransition twice
        https://bugs.webkit.org/show_bug.cgi?id=151606

        Reviewed by Darin Adler.

        In Structure::{freezeTransition, sealTransition}, we perform preventExtensionsTransition.
        So it is unnecessary to perform preventExtensionsTransition before executing Structure::{freezeTransition, sealTransition}.

        * runtime/JSObject.cpp:
        (JSC::JSObject::seal):
        (JSC::JSObject::freeze):
        (JSC::JSObject::preventExtensions):
        * tests/stress/freeze-and-seal-should-prevent-extensions.js: Added.
        (shouldBe):
        (shouldThrow):

2015-11-30  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Add Sqrt to B3
        https://bugs.webkit.org/show_bug.cgi?id=151692

        Reviewed by Geoffrey Garen.

        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::sqrtDouble):
        * assembler/X86Assembler.h:
        (JSC::X86Assembler::sqrtsd_mr):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3Opcode.cpp:
        (WTF::printInternal):
        * b3/B3Opcode.h:
        * b3/B3Validate.cpp:
        * b3/B3Value.cpp:
        (JSC::B3::Value::effects):
        (JSC::B3::Value::key):
        (JSC::B3::Value::typeFor):
        * b3/air/AirOpcode.opcodes:
        * b3/testb3.cpp:
        (JSC::B3::testSqrtArg):
        (JSC::B3::testSqrtImm):
        (JSC::B3::testSqrtMem):
        (JSC::B3::run):
        * ftl/FTLB3Output.h:
        (JSC::FTL::Output::doubleSqrt):

2015-11-30  Filip Pizlo  <fpizlo@apple.com>

        FTL lazy slow paths should work with B3
        https://bugs.webkit.org/show_bug.cgi?id=151667

        Reviewed by Geoffrey Garen.

        This adds all of the glue necessary to make FTL::LazySlowPath work with B3. The B3 approach
        allows us to put all of the code in FTL::LowerDFGToLLVM, instead of having supporting data
        structures on the side and a bunch of complex code in FTLCompile.cpp.

        * b3/B3CheckSpecial.cpp:
        (JSC::B3::CheckSpecial::generate):
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::run):
        * b3/B3PatchpointSpecial.cpp:
        (JSC::B3::PatchpointSpecial::generate):
        * b3/B3StackmapValue.h:
        * ftl/FTLJSTailCall.cpp:
        (JSC::FTL::DFG::recoveryFor):
        (JSC::FTL::JSTailCall::emit):
        * ftl/FTLLazySlowPath.cpp:
        (JSC::FTL::LazySlowPath::LazySlowPath):
        (JSC::FTL::LazySlowPath::generate):
        * ftl/FTLLazySlowPath.h:
        (JSC::FTL::LazySlowPath::createGenerator):
        (JSC::FTL::LazySlowPath::patchableJump):
        (JSC::FTL::LazySlowPath::done):
        (JSC::FTL::LazySlowPath::patchpoint):
        (JSC::FTL::LazySlowPath::usedRegisters):
        (JSC::FTL::LazySlowPath::callSiteIndex):
        (JSC::FTL::LazySlowPath::stub):
        * ftl/FTLLocation.cpp:
        (JSC::FTL::Location::forValueRep):
        (JSC::FTL::Location::forStackmaps):
        (JSC::FTL::Location::dump):
        (JSC::FTL::Location::isGPR):
        (JSC::FTL::Location::gpr):
        (JSC::FTL::Location::isFPR):
        (JSC::FTL::Location::fpr):
        (JSC::FTL::Location::restoreInto):
        * ftl/FTLLocation.h:
        (JSC::FTL::Location::Location):
        (JSC::FTL::Location::forRegister):
        (JSC::FTL::Location::forIndirect):
        (JSC::FTL::Location::forConstant):
        (JSC::FTL::Location::kind):
        (JSC::FTL::Location::hasReg):
        (JSC::FTL::Location::reg):
        (JSC::FTL::Location::hasOffset):
        (JSC::FTL::Location::offset):
        (JSC::FTL::Location::hash):
        (JSC::FTL::Location::hasDwarfRegNum): Deleted.
        (JSC::FTL::Location::dwarfRegNum): Deleted.
        (JSC::FTL::Location::hasDwarfReg): Deleted.
        (JSC::FTL::Location::dwarfReg): Deleted.
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::LowerDFGToLLVM):
        (JSC::FTL::DFG::LowerDFGToLLVM::lazySlowPath):
        * jit/RegisterSet.cpp:
        (JSC::RegisterSet::stubUnavailableRegisters):
        (JSC::RegisterSet::macroScratchRegisters):
        (JSC::RegisterSet::calleeSaveRegisters):
        * jit/RegisterSet.h:

2015-11-30  Geoffrey Garen  <ggaren@apple.com>

        Use a better RNG for Math.random()
        https://bugs.webkit.org/show_bug.cgi?id=151641

        Reviewed by Anders Carlsson.

        Updated for interface change.

        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::setInputCursor):

2015-11-30  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Speed up Air Liveness Analysis on Tmps
        https://bugs.webkit.org/show_bug.cgi?id=151556

        Reviewed by Filip Pizlo.

        Liveness Analysis scales poorly on large graphs like the ones
        generated by testComplex().
        This patch introduces a faster of Liveness using the continuous indices
        of values instead of the values themselves.

        There are two main areas of improvements:
        1) Reduce the cost of doing a LocalCalc over a BasicBlock.
        2) Reduce how many LocalCalc are needed to converge to a solution.

        Most of the costs of LocalCalc are from HashSet manipulations.
        The HashSet operations are O(1) but the constant is large enough
        to be a problem.

        I used a similar trick as the Register Allocator to remove hashing
        and collision handling: the absolute value of the Tmp is used as an index
        into a flat array.

        I used Briggs's Sparse Set implementation for the local live information
        at each instruction. It has great properties for doing the local calculation:
        -No memory reallocation.
        -O(1) add() and remove() with a small constant.
        -Strict O(n) iteration.
        -O(1) clear().

        The values Live-At-Head are now stored into a Vector. The Sparse Set
        is used to maintain the Tmp uniqueness.

        When forwarding new liveness at head to the predecessor, I start by removing
        everything that was already in live-at-head. We can assume that any value
        in that list has already been added to the predecessors.
        This leaves us with a small-ish number of Tmps to add to live-at-head
        and to the predecessors.

        The speed up convergence, I used the same trick as DFG's liveness: keep
        a set of dirty blocks to process. In practice, all the blocks without
        back-edges converge quickly, and we only propagate liveness as needed.

        This patch reduces the time taken by "testComplex(64, 384)" by another 5%.

        The remaining things to do for Liveness are:
        -Skip the first block for the fix point (it is often large and doing a local
         calc on it is useless).
        -Find a better Data Structure for live-at-tail (updating the HashSet takes
         > 50% of the total convergence time).

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/air/AirIteratedRegisterCoalescing.cpp:
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::build):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::getAlias):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::getAliasWhenSpilling):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::allocatedReg):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::tmpArraySize):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::initializeDegrees):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::addEdges):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::addEdge):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::makeWorkList):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::simplify):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::forEachAdjacent):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::hasBeenSimplified):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::decrementDegree):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::forEachNodeMoves):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::isMoveRelated):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::enableMovesOnValue):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::precoloredCoalescingHeuristic):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::conservativeHeuristic):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::addWorkList):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::combine):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::freezeMoves):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::selectSpill):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::assignColors):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::dumpInterferenceGraphInDot):
        (JSC::B3::Air::iteratedRegisterCoalescingOnType):
        (JSC::B3::Air::iteratedRegisterCoalescing):
        (JSC::B3::Air::AbsoluteTmpHelper<Arg::GP>::absoluteIndex): Deleted.
        (JSC::B3::Air::AbsoluteTmpHelper<Arg::GP>::tmpFromAbsoluteIndex): Deleted.
        (JSC::B3::Air::AbsoluteTmpHelper<Arg::FP>::absoluteIndex): Deleted.
        (JSC::B3::Air::AbsoluteTmpHelper<Arg::FP>::tmpFromAbsoluteIndex): Deleted.
        * b3/air/AirReportUsedRegisters.cpp:
        (JSC::B3::Air::reportUsedRegisters):
        * b3/air/AirTmpInlines.h:
        (JSC::B3::Air::AbsoluteTmpMapper<Arg::GP>::absoluteIndex):
        (JSC::B3::Air::AbsoluteTmpMapper<Arg::GP>::tmpFromAbsoluteIndex):
        (JSC::B3::Air::AbsoluteTmpMapper<Arg::FP>::absoluteIndex):
        (JSC::B3::Air::AbsoluteTmpMapper<Arg::FP>::tmpFromAbsoluteIndex):
        * b3/air/AirLiveness.h: Added.

2015-11-30  Saam barati  <sbarati@apple.com>

        FTL OSR Exits that are exception handlers should not have two different entrances. Instead, we should have two discrete OSR exits that do different things.
        https://bugs.webkit.org/show_bug.cgi?id=151404

        Reviewed by Filip Pizlo.

        * ftl/FTLCompile.cpp:
        (JSC::FTL::mmAllocateDataSection):
        * ftl/FTLExceptionHandlerManager.cpp:
        (JSC::FTL::ExceptionHandlerManager::addNewExit):
        (JSC::FTL::ExceptionHandlerManager::addNewCallOperationExit):
        (JSC::FTL::ExceptionHandlerManager::callOperationExceptionTarget):
        (JSC::FTL::ExceptionHandlerManager::lazySlowPathExceptionTarget):
        (JSC::FTL::ExceptionHandlerManager::callOperationOSRExit):
        (JSC::FTL::ExceptionHandlerManager::getByIdOSRExit): Deleted.
        (JSC::FTL::ExceptionHandlerManager::subOSRExit): Deleted.
        * ftl/FTLExceptionHandlerManager.h:
        * ftl/FTLExitThunkGenerator.cpp:
        (JSC::FTL::ExitThunkGenerator::emitThunk):
        * ftl/FTLOSRExit.cpp:
        (JSC::FTL::OSRExitDescriptor::OSRExitDescriptor):
        (JSC::FTL::OSRExitDescriptor::isExceptionHandler):
        (JSC::FTL::OSRExit::OSRExit):
        (JSC::FTL::OSRExit::spillRegistersToSpillSlot):
        (JSC::FTL::OSRExit::recoverRegistersFromSpillSlot):
        (JSC::FTL::OSRExit::willArriveAtExitFromIndirectExceptionCheck):
        (JSC::FTL::OSRExit::willArriveAtOSRExitFromGenericUnwind):
        (JSC::FTL::OSRExit::willArriveAtOSRExitFromCallOperation):
        (JSC::FTL::OSRExit::needsRegisterRecoveryOnGenericUnwindOSRExitPath):
        (JSC::FTL::OSRExitDescriptor::willArriveAtExitFromIndirectExceptionCheck): Deleted.
        (JSC::FTL::OSRExitDescriptor::mightArriveAtOSRExitFromGenericUnwind): Deleted.
        (JSC::FTL::OSRExitDescriptor::mightArriveAtOSRExitFromCallOperation): Deleted.
        (JSC::FTL::OSRExitDescriptor::needsRegisterRecoveryOnGenericUnwindOSRExitPath): Deleted.
        * ftl/FTLOSRExit.h:
        * ftl/FTLOSRExitCompilationInfo.h:
        (JSC::FTL::OSRExitCompilationInfo::OSRExitCompilationInfo):
        * ftl/FTLOSRExitCompiler.cpp:
        (JSC::FTL::compileFTLOSRExit):

2015-11-30  Mark Lam  <mark.lam@apple.com>

        Refactor the op_add, op_sub, and op_mul snippets to use the SnippetOperand class.
        https://bugs.webkit.org/show_bug.cgi?id=151678

        Reviewed by Geoffrey Garen.

        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileValueAdd):
        (JSC::DFG::SpeculativeJIT::compileArithSub):
        * ftl/FTLCompile.cpp:
        * jit/JITAddGenerator.cpp:
        (JSC::JITAddGenerator::generateFastPath):
        * jit/JITAddGenerator.h:
        (JSC::JITAddGenerator::JITAddGenerator):
        * jit/JITArithmetic.cpp:
        (JSC::JIT::emit_op_add):
        (JSC::JIT::emit_op_mul):
        (JSC::JIT::emit_op_sub):
        * jit/JITMulGenerator.cpp:
        (JSC::JITMulGenerator::generateFastPath):
        * jit/JITMulGenerator.h:
        (JSC::JITMulGenerator::JITMulGenerator):
        * jit/JITSubGenerator.cpp:
        (JSC::JITSubGenerator::generateFastPath):
        * jit/JITSubGenerator.h:
        (JSC::JITSubGenerator::JITSubGenerator):
        * jit/SnippetOperand.h:
        (JSC::SnippetOperand::isPositiveConstInt32):

2015-11-30  Filip Pizlo  <fpizlo@apple.com>

        B3 stackmaps should support early clobber
        https://bugs.webkit.org/show_bug.cgi?id=151668

        Reviewed by Geoffrey Garen.

        While starting work on FTL lazy slow paths, I realized that we needed some way to say that r11 is
        off limits. Not just that it's clobbered, but that it cannot be used for any input values to a
        stackmap.

        In LLVM we do this by having the AnyRegCC forbid r11.

        In B3, we want something more flexible. In this and other cases, what we really want is an early
        clobber set. B3 already supported a late clobber set for every stackmap value. Late clobber means
        that the act of performing the operation will cause garbage to be written into those registers.
        But here we want: assume that garbage magically appears in those registers in the moment before
        the operation executes. Any registers in that set will be off-limits to the inputs to the
        stackmap. This should be great for other things, like the way the we handle exceptions.

        For the simple r11 issue, what we want is to call the StackmapValue::clobber() method, which now
        means both early and late clobber. It's the weapon of choice whenever you're unsure.

        This adds the early clobber feature, does some minor Inst refactoring to make this less scary,
        and adds a test. The test is simple but it's very comprehensive - for example it tests the
        early-clobber-after-Move special case.

        * b3/B3StackmapSpecial.cpp:
        (JSC::B3::StackmapSpecial::extraClobberedRegs):
        (JSC::B3::StackmapSpecial::extraEarlyClobberedRegs):
        (JSC::B3::StackmapSpecial::forEachArgImpl):
        * b3/B3StackmapSpecial.h:
        * b3/B3StackmapValue.cpp:
        (JSC::B3::StackmapValue::dumpMeta):
        (JSC::B3::StackmapValue::StackmapValue):
        * b3/B3StackmapValue.h:
        * b3/air/AirCCallSpecial.cpp:
        (JSC::B3::Air::CCallSpecial::extraClobberedRegs):
        (JSC::B3::Air::CCallSpecial::extraEarlyClobberedRegs):
        (JSC::B3::Air::CCallSpecial::dumpImpl):
        * b3/air/AirCCallSpecial.h:
        * b3/air/AirInst.h:
        * b3/air/AirInstInlines.h:
        (JSC::B3::Air::Inst::extraClobberedRegs):
        (JSC::B3::Air::Inst::extraEarlyClobberedRegs):
        (JSC::B3::Air::Inst::forEachTmpWithExtraClobberedRegs):
        (JSC::B3::Air::Inst::reportUsedRegisters):
        (JSC::B3::Air::Inst::forEachDefAndExtraClobberedTmp): Deleted.
        * b3/air/AirIteratedRegisterCoalescing.cpp:
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::IteratedRegisterCoalescingAllocator):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::build):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::allocate):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::initializeDegrees):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::addEdges):
        (JSC::B3::Air::IteratedRegisterCoalescingAllocator::addEdge):
        (JSC::B3::Air::iteratedRegisterCoalescingOnType):
        (JSC::B3::Air::iteratedRegisterCoalescing):
        * b3/air/AirSpecial.h:
        * b3/air/AirSpillEverything.cpp:
        (JSC::B3::Air::spillEverything):
        * b3/testb3.cpp:
        (JSC::B3::testSimplePatchpointWithoutOuputClobbersGPArgs):
        (JSC::B3::testSimplePatchpointWithOuputClobbersGPArgs):
        (JSC::B3::testSimplePatchpointWithoutOuputClobbersFPArgs):
        (JSC::B3::testSimplePatchpointWithOuputClobbersFPArgs):
        (JSC::B3::testPatchpointWithEarlyClobber):
        (JSC::B3::testPatchpointCallArg):
        (JSC::B3::run):
        * dfg/DFGCommon.h:

2015-11-30  Mark Lam  <mark.lam@apple.com>

        Snippefy op_div for the baseline JIT.
        https://bugs.webkit.org/show_bug.cgi?id=151607

        Reviewed by Geoffrey Garen.

        * CMakeLists.txt:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj:
        * JavaScriptCore.vcxproj/JavaScriptCore.vcxproj.filters:
        * JavaScriptCore.xcodeproj/project.pbxproj:

        * jit/JIT.h:
        * jit/JITArithmetic.cpp:
        (JSC::JIT::emit_op_div):
        (JSC::JIT::emitSlow_op_div):
        (JSC::JIT::compileBinaryArithOpSlowCase): Deleted.

        * jit/JITArithmetic32_64.cpp:
        (JSC::JIT::emitBinaryDoubleOp):
        (JSC::JIT::emit_op_div): Deleted.
        (JSC::JIT::emitSlow_op_div): Deleted.
        - Removed the 32-bit specific op_div implementation.  The 64-bit version with the
          op_div snippet can now service both 32-bit and 64-bit.
 
        * jit/JITDivGenerator.cpp: Added.
        (JSC::JITDivGenerator::loadOperand):
        (JSC::JITDivGenerator::generateFastPath):
        * jit/JITDivGenerator.h: Added.
        (JSC::JITDivGenerator::JITDivGenerator):
        (JSC::JITDivGenerator::didEmitFastPath):
        (JSC::JITDivGenerator::endJumpList):
        (JSC::JITDivGenerator::slowPathJumpList):
 
        * jit/JITInlines.h:
        (JSC::JIT::getOperandConstantDouble): Added.
 
        * jit/SnippetOperand.h: Added.
        (JSC::SnippetOperand::SnippetOperand):
        (JSC::SnippetOperand::mightBeNumber):
        (JSC::SnippetOperand::definitelyIsNumber):
        (JSC::SnippetOperand::isConst):
        (JSC::SnippetOperand::isConstInt32):
        (JSC::SnippetOperand::isConstDouble):
        (JSC::SnippetOperand::asRawBits):
        (JSC::SnippetOperand::asConstInt32):
        (JSC::SnippetOperand::asConstDouble):
        (JSC::SnippetOperand::setConstInt32):
        (JSC::SnippetOperand::setConstDouble):
        - The SnippetOperand encapsulates operand constness, const type, and profiling
          information.  As a result:
          1. The argument list to the JITDivGenerator constructor is now more concise.
          2. The logic of the JITDivGenerator is now less verbose and easier to express.

        * parser/ResultType.h:
        (JSC::ResultType::isInt32):
        (JSC::ResultType::definitelyIsNumber):
        (JSC::ResultType::definitelyIsString):
        (JSC::ResultType::definitelyIsBoolean):
        (JSC::ResultType::mightBeNumber):
        (JSC::ResultType::isNotNumber):
        - Made these functions const because they were always meant to be const.
          This also allows me to enforce constness in the SnippetOperand.

2015-11-30  Sukolsak Sakshuwong  <sukolsak@gmail.com>

        Fix coding style of Intl code
        https://bugs.webkit.org/show_bug.cgi?id=151491

        Reviewed by Darin Adler.

        This patch does three things:
        1. Rename pointers and references to ExecState from "exec" to "state".
        2. Pass parameters by references instead of pointers if the parameters
           are required.
        3. Remove the word "get" from the names of functions that don't return
           values through out arguments.

        * runtime/IntlCollator.cpp:
        (JSC::IntlCollatorFuncCompare):
        * runtime/IntlCollatorConstructor.cpp:
        (JSC::initializeCollator):
        (JSC::constructIntlCollator):
        (JSC::callIntlCollator):
        (JSC::IntlCollatorConstructor::getOwnPropertySlot):
        (JSC::IntlCollatorConstructorFuncSupportedLocalesOf):
        * runtime/IntlDateTimeFormat.cpp:
        (JSC::IntlDateTimeFormatFuncFormatDateTime):
        * runtime/IntlDateTimeFormatConstructor.cpp:
        (JSC::constructIntlDateTimeFormat):
        (JSC::callIntlDateTimeFormat):
        (JSC::IntlDateTimeFormatConstructor::getOwnPropertySlot):
        (JSC::IntlDateTimeFormatConstructorFuncSupportedLocalesOf):
        * runtime/IntlDateTimeFormatPrototype.cpp:
        (JSC::IntlDateTimeFormatPrototype::getOwnPropertySlot):
        (JSC::IntlDateTimeFormatPrototypeGetterFormat):
        (JSC::IntlDateTimeFormatPrototypeFuncResolvedOptions):
        * runtime/IntlNumberFormat.cpp:
        (JSC::IntlNumberFormatFuncFormatNumber):
        * runtime/IntlNumberFormatConstructor.cpp:
        (JSC::constructIntlNumberFormat):
        (JSC::callIntlNumberFormat):
        (JSC::IntlNumberFormatConstructor::getOwnPropertySlot):
        (JSC::IntlNumberFormatConstructorFuncSupportedLocalesOf):
        * runtime/IntlNumberFormatPrototype.cpp:
        (JSC::IntlNumberFormatPrototype::getOwnPropertySlot):
        (JSC::IntlNumberFormatPrototypeGetterFormat):
        (JSC::IntlNumberFormatPrototypeFuncResolvedOptions):
        * runtime/IntlObject.cpp:
        (JSC::intlBooleanOption):
        (JSC::intlStringOption):
        (JSC::privateUseLangTag):
        (JSC::canonicalLangTag):
        (JSC::grandfatheredLangTag):
        (JSC::canonicalizeLanguageTag):
        (JSC::canonicalizeLocaleList):
        (JSC::lookupSupportedLocales):
        (JSC::bestFitSupportedLocales):
        (JSC::supportedLocales):
        (JSC::getIntlBooleanOption): Deleted.
        (JSC::getIntlStringOption): Deleted.
        (JSC::getPrivateUseLangTag): Deleted.
        (JSC::getCanonicalLangTag): Deleted.
        (JSC::getGrandfatheredLangTag): Deleted.
        * runtime/IntlObject.h:

2015-11-30  Benjamin Poulain  <bpoulain@apple.com>

        [JSC] Simplify the loop that remove useless Air instructions
        https://bugs.webkit.org/show_bug.cgi?id=151652

        Reviewed by Andreas Kling.

        * b3/air/AirEliminateDeadCode.cpp:
        (JSC::B3::Air::eliminateDeadCode):
        Use Vector's removeAllMatching() instead of custom code.

        It is likely faster too since we remove few values and Vector
        is good at doing that.

2015-11-30  Filip Pizlo  <fpizlo@apple.com>

        B3 should be be clever about choosing which child to reuse for result in two-operand commutative operations
        https://bugs.webkit.org/show_bug.cgi?id=151321

        Reviewed by Geoffrey Garen.

        When lowering a commutative operation to a two-operand instruction, you have a choice of which
        child value to move into the result tmp. For example we might have:

            @x = Add(@y, @z)

        Assuming no three-operand add is available, we could either lower it to this:

            Move %y, %x
            Add %z, %x

        or to this:

            Move %z, %x
            Add %y, %x

        Which is better depends on the likelihood of coalescing with %x. If it's more likely that %y will
        coalesce with %x, then we want to use the first form. Otherwise, we should use the second form.

        This implements two heuristics for selecting the right form, and makes those heuristics reusable
        within the B3->Air lowering by abstracting it as preferRightForResult(). For non-commutative
        operations we must use the first form, so the first form is the default. The heuristics are:

        - If the right child has only one user, then use the second form instead. This is profitable because
          that means that @z dies at the Add, so using the second form means that the Move will be coalesced
          away.

        - If one of the children is a Phi that this operation (the Add in this case) flows into via some
          Upsilon - possibly transitively through other Phis - then use the form that cases a Move on that
          child. This overrides everything else, and is meant to optimize variables that accumulate in a
          loop.

        This required adding a reusable PhiChildren analysis, so I wrote one. It has an API that is mostly
        based on iterators, and a higher-level API for looking at transitive children that is based on
        functors.

        I was originally implementing this for completeness, but when looking at how it interacted with
        imaging-gaussian-blur, I realized the need for some heuristic for the loop-accumulator case. This
        helps a lot on that benchmark. This widens the overall lead that B3 has on imaging-gaussian-blur, but
        steady-state runs that exclude compile latency still show a slight deficit. That will most likely get
        fixed by https://bugs.webkit.org/show_bug.cgi?id=151174.

        No new tests because the commutativity appears to be covered by existing tests, and anyway, there are
        no correctness implications to commuting a commutative operation.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * b3/B3LowerToAir.cpp:
        (JSC::B3::Air::LowerToAir::LowerToAir):
        (JSC::B3::Air::LowerToAir::canBeInternal):
        (JSC::B3::Air::LowerToAir::appendUnOp):
        (JSC::B3::Air::LowerToAir::preferRightForResult):
        (JSC::B3::Air::LowerToAir::appendBinOp):
        (JSC::B3::Air::LowerToAir::lower):
        * b3/B3PhiChildren.cpp: Added.
        (JSC::B3::PhiChildren::PhiChildren):
        (JSC::B3::PhiChildren::~PhiChildren):
        * b3/B3PhiChildren.h: Added.
        (JSC::B3::PhiChildren::ValueCollection::ValueCollection):
        (JSC::B3::PhiChildren::ValueCollection::size):
        (JSC::B3::PhiChildren::ValueCollection::at):
        (JSC::B3::PhiChildren::ValueCollection::operator[]):
        (JSC::B3::PhiChildren::ValueCollection::contains):
        (JSC::B3::PhiChildren::ValueCollection::iterator::iterator):
        (JSC::B3::PhiChildren::ValueCollection::iterator::operator*):
        (JSC::B3::PhiChildren::ValueCollection::iterator::operator++):
        (JSC::B3::PhiChildren::ValueCollection::iterator::operator==):
        (JSC::B3::PhiChildren::ValueCollection::iterator::operator!=):
        (JSC::B3::PhiChildren::ValueCollection::begin):
        (JSC::B3::PhiChildren::ValueCollection::end):
        (JSC::B3::PhiChildren::UpsilonCollection::UpsilonCollection):
        (JSC::B3::PhiChildren::UpsilonCollection::size):
        (JSC::B3::PhiChildren::UpsilonCollection::at):
        (JSC::B3::PhiChildren::UpsilonCollection::operator[]):
        (JSC::B3::PhiChildren::UpsilonCollection::contains):
        (JSC::B3::PhiChildren::UpsilonCollection::begin):
        (JSC::B3::PhiChildren::UpsilonCollection::end):
        (JSC::B3::PhiChildren::UpsilonCollection::values):
        (JSC::B3::PhiChildren::UpsilonCollection::forAllTransitiveIncomingValues):
        (JSC::B3::PhiChildren::UpsilonCollection::transitivelyUses):
        (JSC::B3::PhiChildren::at):
        (JSC::B3::PhiChildren::operator[]):
        * b3/B3Procedure.cpp:
        (JSC::B3::Procedure::Procedure):
        * b3/B3Procedure.h:
        * b3/B3UseCounts.cpp:
        (JSC::B3::UseCounts::UseCounts):
        * b3/B3UseCounts.h:
        (JSC::B3::UseCounts::numUses):
        (JSC::B3::UseCounts::numUsingInstructions):
        (JSC::B3::UseCounts::operator[]): Deleted.

2015-11-30  Filip Pizlo  <fpizlo@apple.com>

        REGRESSION(r192812): This change seems to have broken the iOS builds (Requested by ryanhaddad on #webkit).
        https://bugs.webkit.org/show_bug.cgi?id=151669

        Unreviewed, fix build.

        * dfg/DFGCommon.h:

2015-11-30  Saam barati  <sbarati@apple.com>

        implement op_get_rest_length so that we can allocate the rest array with the right size from the start
        https://bugs.webkit.org/show_bug.cgi?id=151467

        Reviewed by Geoffrey Garen and Mark Lam.

        This patch implements op_get_rest_length which returns the length
        that the rest parameter array will be. We're implementing this because
        it might be a constant value in the presence of inlining in the DFG.
        We will take advantage of this optimization opportunity in a future patch:
        https://bugs.webkit.org/show_bug.cgi?id=151454
        to emit better code for op_copy_rest.

        op_get_rest_length has two operands: 
        1) a destination
        2) A constant indicating the number of parameters to skip when copying the rest array.

        op_get_rest_length lowers to a JSConstant node when we're inlined
        and not a varargs call (in this case, we statically know the arguments
        length). When that condition isn't met, we lower op_get_rest_length to 
        GetRestArray. GetRestArray produces its result as an int32.

        * bytecode/BytecodeList.json:
        * bytecode/BytecodeUseDef.h:
        (JSC::computeUsesForBytecodeOffset):
        (JSC::computeDefsForBytecodeOffset):
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::dumpBytecode):
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitNewArray):
        (JSC::BytecodeGenerator::emitNewArrayWithSize):
        (JSC::BytecodeGenerator::emitNewFunction):
        (JSC::BytecodeGenerator::emitExpectedFunctionSnippet):
        (JSC::BytecodeGenerator::emitRestParameter):
        * bytecompiler/BytecodeGenerator.h:
        * bytecompiler/NodesCodegen.cpp:
        (JSC::RestParameterNode::emit):
        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::parseBlock):
        * dfg/DFGCapabilities.cpp:
        (JSC::DFG::capabilityLevel):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGDoesGC.cpp:
        (JSC::DFG::doesGC):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGMayExit.cpp:
        (JSC::DFG::mayExit):
        * dfg/DFGNode.h:
        (JSC::DFG::Node::numberOfArgumentsToSkip):
        * dfg/DFGNodeType.h:
        * dfg/DFGOperations.cpp:
        * dfg/DFGOperations.h:
        * dfg/DFGPredictionPropagationPhase.cpp:
        (JSC::DFG::PredictionPropagationPhase::propagate):
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileCopyRest):
        (JSC::DFG::SpeculativeJIT::compileGetRestLength):
        (JSC::DFG::SpeculativeJIT::compileNotifyWrite):
        * dfg/DFGSpeculativeJIT.h:
        (JSC::DFG::SpeculativeJIT::callOperation):
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToLLVM.cpp:
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNode):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileCopyRest):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileGetRestLength):
        (JSC::FTL::DFG::LowerDFGToLLVM::compileNewObject):
        * jit/JIT.cpp:
        (JSC::JIT::privateCompileMainPass):
        * jit/JIT.h:
        * jit/JITOpcodes.cpp:
        (JSC::JIT::emit_op_copy_rest):
        (JSC::JIT::emit_op_get_rest_length):
        * llint/LowLevelInterpreter.asm:
        * llint/LowLevelInterpreter32_64.asm:
        * llint/LowLevelInterpreter64.asm:
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):

2015-11-30  Filip Pizlo  <fpizlo@apple.com>

        MacroAssembler needs an API for disabling scratch registers
        https://bugs.webkit.org/show_bug.cgi?id=151010

        Reviewed by Saam Barati and Michael Saboff.

        This adds two scope classes, DisallowMacroScratchRegisterUsage and
        AllowMacroScratchRegisterUsage. The default is that the scratch registers are enabled. Air
        disables them before generation.

        Henceforth the pattern inside B3 stackmap generator callbacks will be that you can only use
        AllowMacroScratchRegisterUsage if you've either supplied the scratch register as a clobbered
        register and arranged for all of the stackmap values to be late uses, or you're writing a test
        and you're OK with it being fragile with respect to scratch registers. The latter holds in most
        of testb3.

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * assembler/AbstractMacroAssembler.h:
        (JSC::optimizeForX86):
        (JSC::AbstractMacroAssembler::setTempRegisterValid):
        * assembler/AllowMacroScratchRegisterUsage.h: Added.
        (JSC::AllowMacroScratchRegisterUsage::AllowMacroScratchRegisterUsage):
        (JSC::AllowMacroScratchRegisterUsage::~AllowMacroScratchRegisterUsage):
        * assembler/DisallowMacroScratchRegisterUsage.h: Added.
        (JSC::DisallowMacroScratchRegisterUsage::DisallowMacroScratchRegisterUsage):
        (JSC::DisallowMacroScratchRegisterUsage::~DisallowMacroScratchRegisterUsage):
        * assembler/MacroAssemblerX86Common.h:
        (JSC::MacroAssemblerX86Common::scratchRegister):
        (JSC::MacroAssemblerX86Common::loadDouble):
        (JSC::MacroAssemblerX86Common::branchConvertDoubleToInt32):
        * assembler/MacroAssemblerX86_64.h:
        (JSC::MacroAssemblerX86_64::add32):
        (JSC::MacroAssemblerX86_64::and32):
        (JSC::MacroAssemblerX86_64::or32):
        (JSC::MacroAssemblerX86_64::sub32):
        (JSC::MacroAssemblerX86_64::load8):
        (JSC::MacroAssemblerX86_64::addDouble):
        (JSC::MacroAssemblerX86_64::convertInt32ToDouble):
        (JSC::MacroAssemblerX86_64::store32):
        (JSC::MacroAssemblerX86_64::store8):
        (JSC::MacroAssemblerX86_64::callWithSlowPathReturnType):
        (JSC::MacroAssemblerX86_64::call):
        (JSC::MacroAssemblerX86_64::jump):
        (JSC::MacroAssemblerX86_64::tailRecursiveCall):
        (JSC::MacroAssemblerX86_64::makeTailRecursiveCall):
        (JSC::MacroAssemblerX86_64::branchAdd32):
        (JSC::MacroAssemblerX86_64::add64):
        (JSC::MacroAssemblerX86_64::addPtrNoFlags):
        (JSC::MacroAssemblerX86_64::and64):
        (JSC::MacroAssemblerX86_64::lshift64):
        (JSC::MacroAssemblerX86_64::or64):
        (JSC::MacroAssemblerX86_64::sub64):
        (JSC::MacroAssemblerX86_64::store64):
        (JSC::MacroAssemblerX86_64::store64WithAddressOffsetPatch):
        (JSC::MacroAssemblerX86_64::branch64):
        (JSC::MacroAssemblerX86_64::branchPtr):
        (JSC::MacroAssemblerX86_64::branchTest64):
        (JSC::MacroAssemblerX86_64::test64):
        (JSC::MacroAssemblerX86_64::branchPtrWithPatch):
        (JSC::MacroAssemblerX86_64::branch32WithPatch):
        (JSC::MacroAssemblerX86_64::storePtrWithPatch):
        (JSC::MacroAssemblerX86_64::branch8):
        (JSC::MacroAssemblerX86_64::branchTest8):
        (JSC::MacroAssemblerX86_64::convertInt64ToDouble):
        (JSC::MacroAssemblerX86_64::readCallTarget):
        (JSC::MacroAssemblerX86_64::haveScratchRegisterForBlinding):
        (JSC::MacroAssemblerX86_64::scratchRegisterForBlinding):
        (JSC::MacroAssemblerX86_64::canJumpReplacePatchableBranchPtrWithPatch):
        (JSC::MacroAssemblerX86_64::canJumpReplacePatchableBranch32WithPatch):
        (JSC::MacroAssemblerX86_64::revertJumpReplacementToPatchableBranchPtrWithPatch):
        (JSC::MacroAssemblerX86_64::revertJumpReplacementToPatchableBranch32WithPatch):
        (JSC::MacroAssemblerX86_64::revertJumpReplacementToBranchPtrWithPatch):
        (JSC::MacroAssemblerX86_64::repatchCall):
        (JSC::MacroAssemblerX86_64::add64AndSetFlags):
        * b3/air/AirGenerate.cpp:
        (JSC::B3::Air::generate):
        * b3/testb3.cpp:
        (JSC::B3::testSimplePatchpoint):
        (JSC::B3::testSimplePatchpointWithoutOuputClobbersGPArgs):
        (JSC::B3::testSimplePatchpointWithOuputClobbersGPArgs):
        (JSC::B3::testSimplePatchpointWithoutOuputClobbersFPArgs):
        (JSC::B3::testSimplePatchpointWithOuputClobbersFPArgs):
        (JSC::B3::testPatchpointCallArg):
        (JSC::B3::testPatchpointFixedRegister):
        (JSC::B3::testPatchpointAny):
        (JSC::B3::testPatchpointAnyImm):
        (JSC::B3::testSimpleCheck):
        (JSC::B3::testCheckLessThan):
        (JSC::B3::testCheckMegaCombo):
        (JSC::B3::testCheckAddImm):
        (JSC::B3::testCheckAddImmCommute):
        (JSC::B3::testCheckAddImmSomeRegister):
        (JSC::B3::testCheckAdd):
        (JSC::B3::testCheckAdd64):
        (JSC::B3::testCheckAddFoldFail):
        (JSC::B3::testCheckSubImm):
        (JSC::B3::testCheckSubBadImm):
        (JSC::B3::testCheckSub):
        (JSC::B3::testCheckSub64):
        (JSC::B3::testCheckSubFoldFail):
        (JSC::B3::testCheckNeg):
        (JSC::B3::testCheckNeg64):
        (JSC::B3::testCheckMul):
        (JSC::B3::testCheckMulMemory):
        (JSC::B3::testCheckMul2):
        (JSC::B3::testCheckMul64):
        (JSC::B3::testCheckMulFoldFail):
        (JSC::B3::genericTestCompare):
        * dfg/DFGCommon.h:
        * jit/GPRInfo.h:
        (JSC::GPRInfo::toRegister):
        (JSC::GPRInfo::reservedRegisters):

2015-11-26  Mark Lam  <mark.lam@apple.com>

        [ARM64] stress/op_div.js is failing on some divide by 0 cases.
        https://bugs.webkit.org/show_bug.cgi?id=151515

        Reviewed by Saam Barati.

        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileArithDiv):
        - Added a check for the divide by zero case.
        * tests/stress/op_div.js:
        - Un-skipped the test.

2015-11-27  Csaba Osztrogonác  <ossy@webkit.org>

        [cmake] Add testb3 to the build system
        https://bugs.webkit.org/show_bug.cgi?id=151619

        Reviewed by Gyuyoung Kim.

        * shell/CMakeLists.txt:

2015-11-27  Csaba Osztrogonác  <ossy@webkit.org>

        Use mark pragmas only if it is supported
        https://bugs.webkit.org/show_bug.cgi?id=151621

        Reviewed by Mark Lam.

        * b3/air/AirIteratedRegisterCoalescing.cpp:

2015-11-27  Csaba Osztrogonác  <ossy@webkit.org>

        Fix the ENABLE(B3_JIT) build with GCC in B3Procedure.h
        https://bugs.webkit.org/show_bug.cgi?id=151620

        Reviewed by Mark Lam.

        * b3/B3Procedure.h:

2015-11-27  Csaba Osztrogonác  <ossy@webkit.org>

        [cmake] Add new B3 source files to the build system
        https://bugs.webkit.org/show_bug.cgi?id=151618

        Reviewed by Gyuyoung Kim.

        * CMakeLists.txt:

2015-11-26  Carlos Garcia Campos  <cgarcia@igalia.com>

        [GLIB] Implement garbage collector timers
        https://bugs.webkit.org/show_bug.cgi?id=151391

        Reviewed by Žan Doberšek.

        Add GLib implementation using GSource.

        * heap/EdenGCActivityCallback.cpp:
        * heap/FullGCActivityCallback.cpp:
        * heap/GCActivityCallback.cpp:
        (JSC::GCActivityCallback::GCActivityCallback):
        (JSC::GCActivityCallback::scheduleTimer):
        (JSC::GCActivityCallback::cancelTimer):
        * heap/GCActivityCallback.h:
        * heap/Heap.cpp:
        (JSC::Heap::Heap):
        * heap/HeapTimer.cpp:
        (JSC::HeapTimer::HeapTimer):
        (JSC::HeapTimer::~HeapTimer):
        (JSC::HeapTimer::timerDidFire):
        * heap/HeapTimer.h:
        * heap/IncrementalSweeper.cpp:
        (JSC::IncrementalSweeper::IncrementalSweeper):
        (JSC::IncrementalSweeper::scheduleTimer):
        (JSC::IncrementalSweeper::cancelTimer):
        * heap/IncrementalSweeper.h:

2015-11-24  Caitlin Potter  <caitp@igalia.com>

        [JSC] support Computed Property Names in destructuring Patterns
        https://bugs.webkit.org/show_bug.cgi?id=151494

        Reviewed by Saam Barati.

        Add support for computed property names in destructuring BindingPatterns
        and AssignmentPatterns.

        Productions BindingProperty(1) and AssignmentProperty(2) allow for any valid
        PropertName(3), including ComputedPropertyName(4)

        1: http://tc39.github.io/ecma262/#prod-BindingProperty
        2: http://tc39.github.io/ecma262/#prod-AssignmentProperty
        3: http://tc39.github.io/ecma262/#prod-PropertyName
        4: http://tc39.github.io/ecma262/#prod-ComputedPropertyName

        * bytecompiler/NodesCodegen.cpp:
        (JSC::ObjectPatternNode::bindValue):
        * parser/ASTBuilder.h:
        (JSC::ASTBuilder::appendObjectPatternEntry):
        * parser/Nodes.h:
        (JSC::ObjectPatternNode::appendEntry):
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseDestructuringPattern):
        * parser/SyntaxChecker.h:
        (JSC::SyntaxChecker::operatorStackPop):
        * tests/es6.yaml:
        * tests/es6/destructuring_assignment_computed_properties.js: Added.
        (test):
        (test.computeName):
        (test.loadValue):
        (test.out.get a):
        (test.out.set a):
        (test.out.get b):
        (test.out.set b):
        (test.out.get c):
        (test.out.set c):
        (test.get var):

2015-11-24  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, rolling out r192536, r192722, and r192743.
        https://bugs.webkit.org/show_bug.cgi?id=151593

        Still causing trouble. (Requested by kling on #webkit).

        Reverted changesets:

        "[JSC] JSPropertyNameEnumerator could be destructorless."
        https://bugs.webkit.org/show_bug.cgi?id=151242
        http://trac.webkit.org/changeset/192536

        "REGRESSION(r192536): Null pointer dereference in
        JSPropertyNameEnumerator::visitChildren()."
        https://bugs.webkit.org/show_bug.cgi?id=151495
        http://trac.webkit.org/changeset/192722

        "REGRESSION(r192536): Null pointer dereference in
        JSPropertyNameEnumerator::visitChildren()."
        https://bugs.webkit.org/show_bug.cgi?id=151495
        http://trac.webkit.org/changeset/192743

2015-11-23  Brian Burg  <bburg@apple.com>

        Unreviewed, fix the Mac CMake build after r192793.

        * PlatformMac.cmake:

2015-11-20  Brian Burg  <bburg@apple.com>

        Web Inspector: RemoteInspector should track targets and connections for remote automation
        https://bugs.webkit.org/show_bug.cgi?id=151042

        Reviewed by Joseph Pecoraro.

        Refactor RemoteInspector so it can be used to send listings of different target types.
        First, rename Debuggable to RemoteInspectionTarget, and pull things not specific to
        remote inspection into the base class RemoteControllableTarget and its Connection class.

        Add a new RemoteControllableTarget called RemoteAutomationTarget, used by UIProcess
        to support remote UI automation via webinspectord. On the protocol side, this target
        uses a new WIRTypeKey called WIRTypeAutomation to distiguish the listing from
        Web and JavaScript listings and avoid inventing a new listing mechanism.

        * API/JSContextRef.cpp:
        (JSGlobalContextGetDebuggerRunLoop):
        (JSGlobalContextSetDebuggerRunLoop):
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * inspector/InspectorFrontendChannel.h:
        * inspector/remote/RemoteAutomationTarget.cpp: Added.
        (Inspector::RemoteAutomationTarget::setAutomationAllowed): Added.
        * inspector/remote/RemoteAutomationTarget.h: Added.
        * inspector/remote/RemoteConnectionToTarget.h: Renamed from Source/JavaScriptCore/inspector/remote/RemoteInspectorDebuggableConnection.h.
        (Inspector::RemoteTargetBlock::RemoteTargetBlock):
        (Inspector::RemoteTargetBlock::~RemoteTargetBlock):
        (Inspector::RemoteTargetBlock::operator=):
        (Inspector::RemoteTargetBlock::operator()):
        * inspector/remote/RemoteConnectionToTarget.mm: Renamed from Source/JavaScriptCore/inspector/remote/RemoteInspectorDebuggableConnection.mm.
        (Inspector::RemoteTargetHandleRunSourceGlobal):
        (Inspector::RemoteTargetQueueTaskOnGlobalQueue):
        (Inspector::RemoteTargetInitializeGlobalQueue):
        (Inspector::RemoteTargetHandleRunSourceWithInfo):
        (Inspector::RemoteConnectionToTarget::RemoteConnectionToTarget):
        (Inspector::RemoteConnectionToTarget::~RemoteConnectionToTarget):
        (Inspector::RemoteConnectionToTarget::destination):
        (Inspector::RemoteConnectionToTarget::connectionIdentifier):
        (Inspector::RemoteConnectionToTarget::dispatchAsyncOnTarget):
        (Inspector::RemoteConnectionToTarget::setup):
        (Inspector::RemoteConnectionToTarget::targetClosed):
        (Inspector::RemoteConnectionToTarget::close):
        (Inspector::RemoteConnectionToTarget::sendMessageToTarget):
        (Inspector::RemoteConnectionToTarget::sendMessageToFrontend):
        (Inspector::RemoteConnectionToTarget::setupRunLoop):
        (Inspector::RemoteConnectionToTarget::teardownRunLoop):
        (Inspector::RemoteConnectionToTarget::queueTaskOnPrivateRunLoop):
        * inspector/remote/RemoteControllableTarget.cpp: Added.
        (Inspector::RemoteControllableTarget::~RemoteControllableTarget):
        (Inspector::RemoteControllableTarget::init):
        (Inspector::RemoteControllableTarget::update):
        * inspector/remote/RemoteControllableTarget.h: Added.
        * inspector/remote/RemoteInspectionTarget.cpp: Renamed from Source/JavaScriptCore/inspector/remote/RemoteInspectorDebuggable.cpp.
        (Inspector::RemoteInspectionTarget::remoteControlAllowed):
        (Inspector::RemoteInspectionTarget::setRemoteDebuggingAllowed):
        (Inspector::RemoteInspectionTarget::pauseWaitingForAutomaticInspection):
        (Inspector::RemoteInspectionTarget::unpauseForInitializedInspector):
        * inspector/remote/RemoteInspectionTarget.h: Renamed from Source/JavaScriptCore/inspector/remote/RemoteInspectorDebuggable.h.
        (isType):
        * inspector/remote/RemoteInspector.h:

            Code to manage Debuggables now works with RemoteControllableTargets and doesn't
            care whether the target is for Inspection or Automation. Listing data with target-
            and type-specific information are captured when clients call into RemoteInspector
            since that's the easiest time to gather this information on the right thread.
            Use the is<> / downcast<> machinery when we need a concrete Target type.

        * inspector/remote/RemoteInspector.mm:
        (Inspector::RemoteInspector::nextAvailableIdentifier):
        (Inspector::RemoteInspector::registerTarget): renamed from registerDebuggable.
        (Inspector::RemoteInspector::unregisterTarget): renamed from unregisterDebuggable.
        (Inspector::RemoteInspector::updateTarget): renamed from updateDebuggable.
        (Inspector::RemoteInspector::updateAutomaticInspectionCandidate):
        (Inspector::RemoteInspector::sendMessageToRemote):
        (Inspector::RemoteInspector::setupFailed):
        (Inspector::RemoteInspector::stopInternal):
        (Inspector::RemoteInspector::setupXPCConnectionIfNeeded):
        (Inspector::RemoteInspector::xpcConnectionFailed):
        (Inspector::RemoteInspector::listingForTarget):
        (Inspector::RemoteInspector::listingForInspectionTarget):
        (Inspector::RemoteInspector::listingForAutomationTarget):
        (Inspector::RemoteInspector::pushListingsNow):
        (Inspector::RemoteInspector::pushListingsSoon):
        (Inspector::RemoteInspector::receivedSetupMessage):
        (Inspector::RemoteInspector::receivedDataMessage):
        (Inspector::RemoteInspector::receivedDidCloseMessage):
        (Inspector::RemoteInspector::receivedGetListingMessage):
        (Inspector::RemoteInspector::receivedIndicateMessage):
        (Inspector::RemoteInspector::receivedConnectionDiedMessage):
        (Inspector::RemoteInspector::RemoteInspector): Deleted.
        (Inspector::RemoteInspector::registerDebuggable): Deleted.
        (Inspector::RemoteInspector::unregisterDebuggable): Deleted.
        (Inspector::RemoteInspector::updateDebuggable): Deleted.
        (Inspector::RemoteInspector::updateDebuggableAutomaticInspectCandidate): Deleted.
        (Inspector::RemoteInspector::sendMessageToRemoteFrontend): Deleted.
        (Inspector::RemoteInspector::listingForDebuggable): Deleted.
        (Inspector::RemoteInspector::pushListingNow): Deleted.
        (Inspector::RemoteInspector::pushListingSoon): Deleted.
        * inspector/remote/RemoteInspectorConstants.h:
        * runtime/JSGlobalObjectDebuggable.cpp:
        (JSC::JSGlobalObjectDebuggable::dispatchMessageFromRemote):
        (JSC::JSGlobalObjectDebuggable::pauseWaitingForAutomaticInspection):
        (JSC::JSGlobalObjectDebuggable::dispatchMessageFromRemoteFrontend): Deleted.
        * runtime/JSGlobalObjectDebuggable.h:

2015-11-23  Brian Burg  <bburg@apple.com>

        Rename JavaScriptCore builtins files to match exposed object names
        https://bugs.webkit.org/show_bug.cgi?id=151549

        Reviewed by Youenn Fablet.

        As a subtask of unifying code generation for WebCore and JSC builtins, we need to get rid of
        differences between builtins filenames (e.g., Promise.prototype.js) and the name of the
        generated Builtin object (PromisePrototype).

        If we don't do this, then both build systems need special hacks to normalize the object name
        from the file name. It's easier to just normalize the filename.

        * CMakeLists.txt:
        * DerivedSources.make:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * builtins/ArrayIteratorPrototype.js: Renamed from Source/JavaScriptCore/builtins/ArrayIterator.prototype.js.
        * builtins/ArrayPrototype.js: Renamed from Source/JavaScriptCore/builtins/Array.prototype.js.
        * builtins/FunctionPrototype.js: Renamed from Source/JavaScriptCore/builtins/Function.prototype.js.
        * builtins/IteratorPrototype.js: Renamed from Source/JavaScriptCore/builtins/Iterator.prototype.js.
        * builtins/PromiseOperations.js: Renamed from Source/JavaScriptCore/builtins/Operations.Promise.js.
        * builtins/PromisePrototype.js: Renamed from Source/JavaScriptCore/builtins/Promise.prototype.js.
        * builtins/StringIteratorPrototype.js: Renamed from Source/JavaScriptCore/builtins/StringIterator.prototype.js.
        * builtins/TypedArrayPrototype.js: Renamed from Source/JavaScriptCore/builtins/TypedArray.prototype.js.

2015-11-23  Andreas Kling  <akling@apple.com>

        REGRESSION(r192536): Null pointer dereference in JSPropertyNameEnumerator::visitChildren().
        <https://webkit.org/b/151495>

        Reviewed by Mark Lam

        The test I added when fixing this bug the first time caught another bug when
        run on 32-bit: jsString() can also cause GC, so we have to make sure that
        JSPropertyNameEnumerator::m_propertyNames is null until after the array it
        points to has been populated.

        Test: property-name-enumerator-gc-151495.js

        * runtime/JSPropertyNameEnumerator.cpp:
        (JSC::JSPropertyNameEnumerator::finishCreation):

== Rolled over to ChangeLog-2015-11-21 ==