2020-07-01  Saam Barati  <sbarati@apple.com>

        Script to copy over testapi.js is redundant in xcodebuild
        https://bugs.webkit.org/show_bug.cgi?id=213824

        Reviewed by Keith Miller.

        We're already copying over the entire testapiScripts directory.
        No need to manually copy just one file from it, too.

        * JavaScriptCore.xcodeproj/project.pbxproj:

2020-07-01  Tetsuharu Ohzeki  <tetsuharu.ohzeki@gmail.com>

        Use properly flag names for tests of Tools/Scripts/run-builtins-generator-tests
        https://bugs.webkit.org/show_bug.cgi?id=213733

        Reviewed by Youenn Fablet.

        Test cases under Source/JavaScriptCore/Scripts/tests/builtins/ uses exist compilation flags.
        But they can take an arbitary flag name and don't have to use an exist flag.
        I think it's better to rename them to more proper ones.

        * Scripts/tests/builtins/WebCore-ArbitraryConditionalGuard-Separate.js:
        * Scripts/tests/builtins/WebCore-DuplicateKeyValueAnnotation-Separate.js:
        * Scripts/tests/builtins/WebCore-GuardedBuiltin-Separate.js:
        * Scripts/tests/builtins/WebCore-GuardedInternalBuiltin-Separate.js:
        * Scripts/tests/builtins/WebCore-xmlCasingTest-Separate.js:
        * Scripts/tests/builtins/expected/WebCore-ArbitraryConditionalGuard-Separate.js-result:
        * Scripts/tests/builtins/expected/WebCore-GuardedBuiltin-Separate.js-result:
        * Scripts/tests/builtins/expected/WebCore-GuardedInternalBuiltin-Separate.js-result:
        * Scripts/tests/builtins/expected/WebCore-xmlCasingTest-Separate.js-result:
        * Scripts/tests/builtins/expected/WebCoreJSBuiltins.h-result:

2020-06-30  Peng Liu  <peng.liu6@apple.com>

        Enable the support of FULLSCREEN_API in WebKitTestRunner
        https://bugs.webkit.org/show_bug.cgi?id=213774

        Reviewed by Youenn Fablet.

        Replace the definition of ENABLE_FULLSCREEN_API in FeatureDefines.xcconfig with
        the one in PlatformEnableCocoa.h. We have to do that because WebKitTestRunner
        does not have a FeatureDefines.xcconfig but it uses "ENABLE(FULLSCREEN_API)"
        to conditionally compile code to test the element fullscreen API.
        WebKitTestRunner can use the macro defined in PlatformEnableCocoa.h.

        * Configurations/FeatureDefines.xcconfig:

2020-06-30  Andy Estes  <aestes@apple.com>

        [Xcode] Enable the "My Mac (Mac Catalyst)" destination in WebKit Xcode projects
        https://bugs.webkit.org/show_bug.cgi?id=213740

        Reviewed by Darin Adler.

        * Configurations/Base.xcconfig: Set SUPPORTS_MACCATALYST to YES to tell Xcode that this
        project supports building for Mac Catalyst.

2020-06-29  Tetsuharu Ohzeki  <tetsuharu.ohzeki@gmail.com>

        Remove ENABLE_STREAMS_API compilation flag
        https://bugs.webkit.org/show_bug.cgi?id=213728

        Reviewed by Sam Weinig.

        test cases under Scripts/tests/builtins/ does not uses
        this removed compilation flag. So we don't have to touch them in this change.
        
        But they are confusable so I plan to fix them in bug 213733.

        * Configurations/FeatureDefines.xcconfig:

2020-06-29  Keith Miller  <keith_miller@apple.com>

        ConservativeRoots should mark any cell it finds an interior pointer to
        https://bugs.webkit.org/show_bug.cgi?id=213686

        Reviewed by Yusuke Suzuki.

        Currently, if ConserativeRoots finds an interior pointer to a cell
        it will only mark that cell if it's a butterfly of some
        kind. However, this can cause problems if the C++ or B3 compilers
        pre-compute the offset of some cell member they want to load from
        after a call. If this happens and that interior pointer is the
        only reference to the cell it can get collected while it is still
        "alive".

        A naive patch that doesn't return from
        findGCObjectPointersForMarking after finding a live non-interior,
        non-butterfly cell was a 2% regression on Speedometer2 and
        JetStream2. So, this patch immediately returns after
        marking some non-butterfly cell, which appears to have fixed the
        regression locally. Given this was such a big regression (likely
        from running MarkedBlock::isLive) more than once there's possibly
        an optimization opportunity here. I filed
        https://bugs.webkit.org/show_bug.cgi?id=213687 to investigate
        further.

        * heap/HeapCell.cpp:
        (WTF::printInternal):
        * heap/HeapCell.h:
        (JSC::isJSCellKind):
        (JSC::mayHaveIndexingHeader):
        (JSC::hasInteriorPointers): Deleted.
        * heap/HeapUtil.h:
        (JSC::HeapUtil::findGCObjectPointersForMarking):
        * heap/SlotVisitor.cpp:
        (JSC::SlotVisitor::appendJSCellOrAuxiliary):
        * runtime/VM.cpp:
        (JSC::VM::VM):

2020-06-28  Geoffrey Garen  <ggaren@apple.com>

        Rename initializeThreading to initialize
        https://bugs.webkit.org/show_bug.cgi?id=213674

        Reviewed by Mark Lam.

        * API/JSClassRef.cpp:
        * API/JSContextRef.cpp:
        (JSContextGroupCreate):
        (JSGlobalContextCreate):
        (JSGlobalContextCreateInGroup):
        * API/JSObjectRef.cpp:
        (JSClassCreate):
        * API/JSStringRef.cpp:
        (JSStringCreateWithCharacters):
        (JSStringCreateWithUTF8CString):
        (JSStringCreateWithCharactersNoCopy):
        * API/JSStringRefCF.cpp:
        (JSStringCreateWithCFString):
        * API/tests/CompareAndSwapTest.cpp:
        (testCompareAndSwap):
        * API/tests/ExecutionTimeLimitTest.cpp:
        (testExecutionTimeLimit):
        * API/tests/FunctionOverridesTest.cpp:
        (testFunctionOverrides):
        * API/tests/MultithreadedMultiVMExecutionTest.cpp:
        (startMultithreadedMultiVMExecutionTest):
        * API/tests/PingPongStackOverflowTest.cpp:
        (testPingPongStackOverflow):
        * JavaScriptCore.order:
        * assembler/testmasm.cpp:
        (JSC::run):
        * b3/air/testair.cpp:
        (main):
        * b3/testb3_1.cpp:
        (main):
        * dfg/testdfg.cpp:
        (main):
        * dynbench.cpp:
        (main):
        * inspector/remote/cocoa/RemoteInspectorCocoa.mm:
        (Inspector::RemoteInspector::singleton):
        * jsc.cpp:
        (main):
        (jscmain):
        * runtime/InitializeThreading.cpp:
        (JSC::initialize):
        (JSC::initializeThreading): Deleted.
        * runtime/InitializeThreading.h:
        * runtime/JSCConfig.h:
        * shell/playstation/TestShell.cpp:
        (setupTestRun):
        * testRegExp.cpp:
        (main):

2020-06-27  Saam Barati  <sbarati@apple.com>

        BytecodeBasicBlock::addSuccessor should check if the  successor already exists
        https://bugs.webkit.org/show_bug.cgi?id=213670

        Reviewed by Yusuke Suzuki.

        It makes it nicer for algorithms using BytecodeGraph to not have to consider
        whether or not there are duplicates in the successor list. Also, because of
        this, bytecode liveness was doing extra work since it walked the successor list,
        including any duplicates in it.

        * bytecode/BytecodeBasicBlock.h:
        (JSC::BytecodeBasicBlock::addSuccessor):

2020-06-27  Saam Barati  <sbarati@apple.com>

        Change bytecode dumping to dump the bytecode control flow graph
        https://bugs.webkit.org/show_bug.cgi?id=213669

        Reviewed by Yusuke Suzuki.

        This makes the bytecode control flow graphs much easier to understand, and
        puts bytecode dumping in more in line with how we dump other IRs.
        
        The new dumps look like this:
        ```
        foo#Ahf63N:[0x1035bc120->0x1035e5100, NoneFunctionCall, 36]: 13 instructions (0 16-bit instructions, 0 32-bit instructions, 1 instructions with metadata); 156 bytes (120 metadata bytes); 2 parameter(s); 8 callee register(s); 6 variable(s); scope at loc4
        
        bb#1
        [   0] enter              
        [   1] get_scope          loc4
        [   3] mov                loc5, loc4
        [   6] check_traps        
        [   7] mov                loc6, <JSValue()>(const0)
        [  10] mov                loc6, Undefined(const1)
        [  13] mod                loc7, arg1, Int32: 2(const2)
        [  17] jfalse             loc7, 8(->25)
        Successors: [ #3 #2 ]
        
        bb#2
        [  20] mov                loc6, Int32: 42(const3)
        [  23] jmp                5(->28)
        Successors: [ #4 ]
        
        bb#3
        [  25] mov                loc6, Int32: 77(const4)
        Successors: [ #4 ]
        
        bb#4
        [  28] add                loc7, arg1, loc6, OperandTypes(126, 126)
        [  34] ret                loc7
        Successors: [ ]
        ```

        * bytecode/BytecodeDumper.cpp:
        (JSC::dumpHeader):
        (JSC::dumpFooter):
        (JSC::CodeBlockBytecodeDumper<Block>::dumpBlock):
        (JSC::CodeBlockBytecodeDumper<Block>::dumpGraph):
        * bytecode/BytecodeDumper.h:
        * bytecode/BytecodeGraph.h:
        (JSC::BytecodeGraph::dump):
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::dumpBytecode):

2020-06-27  Stephan Szabo  <stephan.szabo@sony.com>

        [PlayStation] Update test runner for changes to Options and signing
        https://bugs.webkit.org/show_bug.cgi?id=213650

        Reviewed by Don Olmstead.

        * shell/playstation/Initializer.cpp: Load ICU library
        * shell/playstation/TestShell.cpp: Update between test options reset

2020-06-26  Geoffrey Garen  <ggaren@apple.com>

        Initializing the main thread should initialize the main run loop
        https://bugs.webkit.org/show_bug.cgi?id=213637

        Reviewed by Anders Carlsson.

        * JavaScriptCore.order: Removed some defunct stuff.
        * shell/playstation/TestShell.cpp:
        (setupTestRun): Merged initializeThreading call with
        initializeMainThread call because initializeMainThread is a superset.

2020-06-25  Yusuke Suzuki  <ysuzuki@apple.com>

        REGRESSION(r263035): stress/get-prototype-of.js broken on s390x
        https://bugs.webkit.org/show_bug.cgi?id=213307

        Reviewed by Ross Kirsling.

        Structure::m_outOfLineTypeFlags is uint16_t. If we access this field as 32bit field, we have different value in big endian architectures.
        Since we do not have half-size-load branch instructions, we should load this uint16_t value via `loadh` (which zero-extends the loaded value)
        and perform branch onto that value.

        * jit/AssemblyHelpers.cpp:
        (JSC::AssemblyHelpers::emitLoadPrototype):
        * llint/LowLevelInterpreter64.asm:

2020-06-25  Mark Lam  <mark.lam@apple.com>

        JSCell constructor needs to ensure that the passed in structure is still alive.
        https://bugs.webkit.org/show_bug.cgi?id=213593
        <rdar://problem/64597573>

        Reviewed by Yusuke Suzuki.

        Note that in the initializer list of the `JSCell(VM&, Structure*)` constructor,
        we are only using values inside the passed in structure but not necessarily the
        structure pointer itself.  All these values are contained inside Structure::m_blob.
        Note also that this constructor is an inline function.  Hence, the compiler may
        choose to pre-compute the address of structure->m_blob and discard the structure
        pointer itself.

        Here's an example:

            0x10317a21e <+1054>: movq   0x18(%rsp), %rdx  // rdx:vm = &vm
            0x10317a223 <+1059>: addq   $0x8, %r13        // r13 = &structure.m_blob  <== pre-compute address of m_blob !!!
                                                          // r13 previously contained the structure pointer.
                                                          // Now, there's no more references to the structure base address.

            0x10317a227 <+1063>: leaq   0x48(%rdx), %rdi  // arg0:heap = &vm.heap
            0x10317a22b <+1067>: movl   $0x10, %edx       // arg2:size = 16.
            0x10317a230 <+1072>: movq   %rdi, 0x28(%rsp)
            0x10317a235 <+1077>: xorl   %esi, %esi        // arg1:deferralContext = 0
            0x10317a237 <+1079>: callq  0x10317ae60       // call JSC::allocateCell<JSC::JSArray>  <== Can GC here !!!

            0x10317a23c <+1084>: movq   %rax, %rbx        // rbx:cell = rax:allocation result.
            ...
            0x10317a253 <+1107>: movl   (%r13), %eax      // eax = m_blob.structureID  <== Use pre-computed m_blob address here.

        There's a chance that the GC may run while allocating this cell.  In the event
        that the structure is newly instantiated just before calling this constructor, 
        there may not be any other references to it.  As a result, the structure may get
        collected before the cell is even constructed.  To avoid this possibility, we need
        to ensure that the structure pointer is still alive by the time this constructor
        is called.

        I am not committing any tests for this issue because the test cases relies on:

        1. Manually forcing an O3 ASan Release build.

        2. Not running jsc with --useDollarVM=1.  Note: the JSC test harness automatically
           adds --useDollarVM=1 for all test runs.

        3. Memory being allocated in a specific order.  The recent Bitmap FreeList change
           enabled this issue to manifest.  The old linked list FreeList implementation
           would have hidden the issue.

        4. Adding some logging code can also make the issue stop manifesting.

        In short, the test cases will not detect any regression even if we commit them
        because the existing automatic regression test runs will not have the necessary
        conditions for reproducing the issue.  The tests are also somewhat fragile where
        any changes in memory layout may stop the issue from manifesting in an observable
        way.

        * runtime/JSCellInlines.h:
        (JSC::JSCell::JSCell):

2020-06-24  Ross Kirsling  <ross.kirsling@sony.com>

        [Intl] Disprefer using ICU enums directly as instance variables
        https://bugs.webkit.org/show_bug.cgi?id=213587

        Reviewed by Yusuke Suzuki.

        * runtime/IntlPluralRules.cpp:
        (JSC::IntlPluralRules::initializePluralRules):
        (JSC::IntlPluralRules::resolvedOptions const):
        * runtime/IntlPluralRules.h:
        * runtime/IntlRelativeTimeFormat.cpp:
        (JSC::IntlRelativeTimeFormat::initializeRelativeTimeFormat):
        (JSC::IntlRelativeTimeFormat::styleString): Renamed from JSC::styleString.
        (JSC::IntlRelativeTimeFormat::resolvedOptions const):
        (JSC::numericString): Deleted.
        * runtime/IntlRelativeTimeFormat.h:

2020-06-24  Caitlin Potter  <caitp@igalia.com>

        [JSC] handle Put/DefinePrivateField in resetPutByID
        https://bugs.webkit.org/show_bug.cgi?id=213583

        Reviewed by Yusuke Suzuki.

        r262613 extends and uses PutByValDirect to support updating and defining private fields, in order to reuse
        the IC machinery. The necessary resetPutByID change was erroneously omitted, and is presented here.

        * jit/Repatch.cpp:
        (JSC::resetPutByID):

2020-06-24  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] llintTrue / jitTrue can encounter native functions
        https://bugs.webkit.org/show_bug.cgi?id=213442
        <rdar://problem/64257914>

        Reviewed by Mark Lam.

        If the CallFrame is for native function, associated CodeBlock is nullptr.
        This patch fixes this case to handle it gracefully.

        * tools/JSDollarVM.cpp:
        (JSC::CallerFrameJITTypeFunctor::CallerFrameJITTypeFunctor):
        (JSC::CallerFrameJITTypeFunctor::operator() const):
        (JSC::functionBaselineJITTrue):
        (JSC::JSDollarVM::finishCreation):
        (JSC::functionJITTrue): Deleted.

2020-06-24  Umar Iqbal  <uiqbal@apple.com>

        We should resurrect the older patch that collects some statistics of web API calls
        https://bugs.webkit.org/show_bug.cgi?id=213319

        Reviewed by Brent Fulgham.

        + Enabled ENABLE_WEB_API_STATISTICS flag

        * Configurations/FeatureDefines.xcconfig:

2020-06-24  Alexey Shvayka  <shvaikalesh@gmail.com>

        Add DFG/FTL fast path for GetPrototypeOf based on OverridesGetPrototype flag
        https://bugs.webkit.org/show_bug.cgi?id=213191

        Reviewed by Yusuke Suzuki.

        This patch:

        1. Introduces `loadInlineOffset` LLInt macro (64-bit only) and utilizes it in
           `get_prototype_of` since we assert that `knownPolyProtoOffset` is an inline offset.

        2. Brings baseline JIT fast path to 32-bit builds, progressing `super-getter.js`
           microbenchmark by a factor of 10 (w/o DFG).

        3. Adds GetPrototypeOf DFG/FTL fast paths that leverage OverridesGetPrototype type
           info flag, advancing provided rare objects microbenchmark by ~46% (~37% w/o FTL).
           Also, cleans up existing DFG fast path by using AssemblyHelpers::loadValue().

        4. Extracts AssemblyHelpers::emitLoadPrototype() and uses it in baseline JIT, DFG, and
           InstanceOfGeneric access case. With this change, `instanceof` access case handles all
           [[GetPrototypeOf]] overrides (before: only Proxy objects), which is more correct, yet
           not observable enough to provide a test case. `instanceof` microbenchmarks are neutral.

        * bytecode/AccessCase.cpp:
        (JSC::AccessCase::generateWithGuard):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileGetPrototypeOf):
        * ftl/FTLAbstractHeapRepository.h:
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileGetPrototypeOf):
        * jit/AssemblyHelpers.cpp:
        (JSC::AssemblyHelpers::emitLoadPrototype):
        * jit/AssemblyHelpers.h:
        * jit/JIT.cpp:
        (JSC::JIT::privateCompileMainPass):
        (JSC::JIT::privateCompileSlowCases):
        * jit/JITOpcodes.cpp:
        (JSC::JIT::emit_op_get_prototype_of):
        * llint/LowLevelInterpreter64.asm:

2020-06-24  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Clobberize misses `write(Heap)` report in some nodes
        https://bugs.webkit.org/show_bug.cgi?id=213525
        <rdar://problem/64642067>

        Reviewed by Mark Lam.

        In some DFG nodes, clobberize phase misses `clobberTopFunctor` call while it is `write(Heap)`,
        which confuses clobberizing validation.

        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):

2020-06-23  Mark Lam  <mark.lam@apple.com>

        Handle string overflow in DFG graph dump while validating AI.
        https://bugs.webkit.org/show_bug.cgi?id=213524
        <rdar://problem/64635620>

        Not reviewed.

        Applying refinement suggested by Darin in https://bugs.webkit.org/show_bug.cgi?id=213524#c3.

        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::validateAIState):

2020-06-23  Mark Lam  <mark.lam@apple.com>

        Handle string overflow in DFG graph dump while validating AI.
        https://bugs.webkit.org/show_bug.cgi?id=213524
        <rdar://problem/64635620>

        Reviewed by Saam Barati.

        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::validateAIState):

2020-06-23  Devin Rousso  <drousso@apple.com>

        Keyframe animation doesn't 't show up in the Animations timeline
        https://bugs.webkit.org/show_bug.cgi?id=213441

        Reviewed by Brian Burg.

        * inspector/protocol/Animation.json:
        An `interationCount` of `Infinity` is not JSON serializable, so represent it as `-1` instead.

2020-06-22  Saam Barati  <sbarati@apple.com>

        Attempt to fix watchOS simulator build.

        * assembler/FastJITPermissions.h:
        (threadSelfRestrictRWXToRW):
        (threadSelfRestrictRWXToRX):

2020-06-22  Saam Barati  <sbarati@apple.com>

        Allow building JavaScriptCore Mac+arm64 in public SDK build
        https://bugs.webkit.org/show_bug.cgi?id=213472

        Reviewed by Sam Weinig.

        We used to only builld code for fast permission switching when using the
        Apple internal SDK. However, with arm64 on macOS, this is no longer a viable
        implementation strategy.
        
        This patch makes it so we can build JSC on macOS+arm64 using the public Xcode
        SDK.
        
        - ENABLE_FAST_JIT_PERMISSIONS is removed. We now use runtime checks instead.
        - In the new suite of OS betas, pthreads has added API for fast permissions
          switching. We now use this API instead of using the non-public SDK found in
          the kernel headers.
        - We fall back to the separated W/X heaps when fast permissions checking is
          not supported. This all happens at runtime.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * assembler/ARM64Assembler.h:
        (JSC::ARM64Assembler::fillNops):
        * assembler/ARMv7Assembler.h:
        (JSC::ARMv7Assembler::fillNops):
        * assembler/FastJITPermissions.h: Added.
        (useFastJITPermissions):
        (threadSelfRestrictRWXToRW):
        (threadSelfRestrictRWXToRX):
        (fastJITPermissionsIsSupported):
        * assembler/LinkBuffer.cpp:
        (JSC::memcpyWrapper):
        (JSC::LinkBuffer::copyCompactAndLinkCode):
        * assembler/MIPSAssembler.h:
        (JSC::MIPSAssembler::fillNops):
        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::link):
        * assembler/MacroAssemblerARMv7.h:
        (JSC::MacroAssemblerARMv7::link):
        * jit/ExecutableAllocator.cpp:
        (JSC::initializeJITPageReservation):
        * jit/ExecutableAllocator.h:
        (JSC::performJITMemcpy):
        (JSC::useFastJITPermissions): Deleted.
        * runtime/JSCConfig.h:
        * runtime/Options.cpp:
        (JSC::Options::recomputeDependentOptions):
        * runtime/OptionsList.h:

2020-06-22  Tim Horton  <timothy_horton@apple.com>

        Disable the JS JIT when running in a translated process
        https://bugs.webkit.org/show_bug.cgi?id=213478

        Reviewed by Saam Barati.

        * runtime/Options.cpp:
        (JSC::Options::recomputeDependentOptions):
        Based on our performance experiements, disable the JavaScript JIT
        (but not the regular expression, DOM, or Wasm JIT) when running
        in a translated process.

2020-06-22  Tim Horton  <timothy_horton@apple.com>

        Update macOS version macros
        https://bugs.webkit.org/show_bug.cgi?id=213484

        Reviewed by Alexey Proskuryakov.

        * Configurations/Base.xcconfig:
        * Configurations/DebugRelease.xcconfig:
        * Configurations/Version.xcconfig:
        * Configurations/WebKitTargetConditionals.xcconfig:

2020-06-19  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Check Gigacage usage before launching VM
        https://bugs.webkit.org/show_bug.cgi?id=213410

        Reviewed by Mark Lam.

        Since VM allocates JSBigInt from Gigacage, it is possible that VM creation fails when Gigacage is exhausted.
        As a work-around for internal testing, we insert ad-hoc Gigacage usage check before launching a new agent.
        If 80% of Gigacage is used, we fail to launch a new VM gracefully.

        * assembler/testmasm.cpp:
        (JSC::testCagePreservesPACFailureBit):
        * jsc.cpp:
        (functionDollarAgentStart):

2020-06-19  James Darpinian  <jdarpinian@chromium.org>

        Typed array constructor behaves differently when length is not passed or when undefined is passed
        https://bugs.webkit.org/show_bug.cgi?id=184232

        Reviewed by Yusuke Suzuki.

        Passing undefined for length should have the same effect as omitting the argument. It was being
        treated as 0 instead.

        * runtime/JSGenericTypedArrayViewConstructorInlines.h:
        (JSC::constructGenericTypedArrayView):

2020-06-19  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Attempt to reduce timeout failures on Apple Watch Series 3
        https://bugs.webkit.org/show_bug.cgi?id=213419

        Reviewed by Mark Lam.

        * tools/JSDollarVM.cpp:
        (JSC::functionUseJIT):
        (JSC::JSDollarVM::finishCreation):

2020-06-19  Mark Lam  <mark.lam@apple.com>

        toString of String doesn't check integrity of structureID in one path.
        https://bugs.webkit.org/show_bug.cgi?id=213338

        Reviewed by Saam Barati.

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

2020-06-19  Saam Barati  <sbarati@apple.com>

        Have a memory monitor thread in jsc shell when running tests using --memory-limited
        https://bugs.webkit.org/show_bug.cgi?id=213389

        Reviewed by Mark Lam.

        When testing on iOS, there are times high memory usage from a JSC test
        will jetsam our entire test runner. This makes it so we don't get any test
        results from that test run, which can make it difficult to track testing
        results.
        
        This patch introduces an optional memory monitoring thread to the JSC
        shell. It's a best effort approach. If memory usage exceeds the passed
        in threshold, we crash the process. Similar to how the timeout mechanism
        works. On Cocoa platforms, we also perform this check in the low memory 
        warning handler.
        
        Currently, we use this feature when running JSC stress tests in
        "--memory-limited" mode.

        * jsc.cpp:
        (crashIfExceedingMemoryLimit):
        (startMemoryMonitoringThreadIfNeeded):
        (jscmain):

2020-06-19  Mark Lam  <mark.lam@apple.com>

        Make $vm properties non-configurable, non-enumerable, and non-writable.
        https://bugs.webkit.org/show_bug.cgi?id=213395

        Reviewed by Saam Barati and Yusuke Suzuki.

        $vm provides functions for test development and VM debugging.  There's no reason
        for them to be configurable, enumerable, and writable.

        We particularly don't want them to be enumerable as this can trip up some fuzzers.
        Fuzzers should not be fuzzing the $vm object which doesn't exist in real world
        uses of JavaScriptCore.

        * tools/JSDollarVM.cpp:
        (JSC::JSDollarVM::finishCreation):
        (JSC::JSDollarVM::addFunction):
        (JSC::JSDollarVM::addConstructibleFunction):

2020-06-19  Tuomas Karkkainen  <tuomas.webkit@apple.com>

        functionCpuClflush checks that the second argument is Int32 but it actually expects it to be UInt32
        https://bugs.webkit.org/show_bug.cgi?id=213388

        Reviewed by Saam Barati.

        This changes the check from isInt32() to isUInt32() so that the logic is consistent.

        * tools/JSDollarVM.cpp:

2020-06-18  Mark Lam  <mark.lam@apple.com>

        Unify Bitmap math loops in MarkedBlock::Handle::specializedSweep().
        https://bugs.webkit.org/show_bug.cgi?id=213345

        Reviewed by Robin Morisset and Saam Barati.

        This change appears to be performance neutral.  However, we'll take the change
        because we know that it does less work, and the new way of expressing the Bitmap
        math in MarkedBlock::Handle::specializedSweep() does appear to be easier to
        understand than the old code.

        Also addressed feedback from Robin and Saam in https://bugs.webkit.org/show_bug.cgi?id=213071.

        Changes made:

        1. Use the new Bitmap::words() API to get direct access to the underlying bits
           storage.  With this, we can do the merging of the marked and newlyAllocated
           bits with a single pass looping thru the bitmap words.

        2. In MarkedBlock::Handle::specializedSweep()'s Bitmap free list code, moved the
           implementation of handleDeadCells lambda down to the call to freeAtoms.forEachSetBit()
           because this is the only place it is used.

        3. Fixed MarkedBlock::Handle::specializedSweep()'s Bitmap free list code to
           handle the dead cells unconditionally.  This condition check was wrongly
           adapted from the linked list implementation where handleDeadCell() was called
           in 2 places depending on the destruction mode.  With the Bitmap free list,
           there is only once place to handle the dead cells, and it should be executed
           unconditionally.

           This fixes a bug where the FreeList::originalSize() never gets computed if the
           cells in the block does not need destruction.

        4. Renamed FreeList::bitmapRows() to FreeList::bitmapRowsMinusOne().
           Renamed FreeList::offsetOfBitmapRows() to FreeList::offsetOfBitmapRowsMinusOne().

        5. Also fixed some typos in comments.

        * heap/FreeList.h:
        (JSC::FreeList::bitmapIsEmpty const):
        (JSC::FreeList::offsetOfBitmapRowsMinusOne):
        (JSC::FreeList::bitmapRowsMinusOne const):
        (JSC::FreeList::offsetOfBitmapRows): Deleted.
        (JSC::FreeList::bitmapRows const): Deleted.
        * heap/FreeListInlines.h:
        (JSC::FreeList::allocate):
        (JSC::FreeList::forEach const):
        * heap/MarkedBlockInlines.h:
        (JSC::MarkedBlock::Handle::specializedSweep):
        * jit/AssemblyHelpers.cpp:
        (JSC::AssemblyHelpers::emitAllocateWithNonNullAllocator):

2020-06-18  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Remove dead non-ICU locale Date code since we are always using ICU version
        https://bugs.webkit.org/show_bug.cgi?id=213362

        Reviewed by Ross Kirsling.

        There are old non-ICU version of Date locale code. But this is now dead code since we are always using ICU version,
        which is invoked from builtin JS DatePrototype.js. We should remove these dead code.

        * runtime/DatePrototype.cpp:
        (JSC::DatePrototype::finishCreation):
        (): Deleted.
        (JSC::styleFromArgString): Deleted.
        (JSC::formatLocaleDate): Deleted.
        (JSC::dateProtoFuncToLocaleString): Deleted.
        (JSC::dateProtoFuncToLocaleDateString): Deleted.
        (JSC::dateProtoFuncToLocaleTimeString): Deleted.

2020-06-18  Ross Kirsling  <ross.kirsling@sony.com>

        Unreviewed, address Darin's feedback on r263227.

        * runtime/IntlRelativeTimeFormat.cpp:
        (JSC::IntlRelativeTimeFormat::UNumberFormatDeleter::operator() const):
        (JSC::IntlRelativeTimeFormat::initializeRelativeTimeFormat):
        (JSC::IntlRelativeTimeFormat::formatToParts const):
        * runtime/IntlRelativeTimeFormat.h:
        Keep ownership over our UNumberFormat instance after all,
        to avoid relying on behavior ICU isn't explicitly guaranteeing.

2020-06-18  Ross Kirsling  <ross.kirsling@sony.com>

        [Intl] Enable RelativeTimeFormat and Locale by default
        https://bugs.webkit.org/show_bug.cgi?id=213324

        Reviewed by Yusuke Suzuki.

        * runtime/IntlObject.cpp:
        (JSC::createDateTimeFormatConstructor):
        (JSC::createLocaleConstructor):
        (JSC::createNumberFormatConstructor):
        (JSC::createRelativeTimeFormatConstructor):
        (JSC::IntlObject::finishCreation):
        Unconditionalize creation of RelativeTimeFormat and Locale constructors.

        * runtime/IntlRelativeTimeFormat.cpp:
        (JSC::IntlRelativeTimeFormat::initializeRelativeTimeFormat):
        (JSC::IntlRelativeTimeFormat::formatToParts const):
        (JSC::IntlRelativeTimeFormat::UNumberFormatDeleter::operator() const): Deleted.
        * runtime/IntlRelativeTimeFormat.h:
        Fix an actual bug -- URelativeDateTimeFormatter *adopts* the UNumberFormat it's instantiated with,
        so we can't keep a unique_ptr to it.

        * runtime/OptionsList.h:
        Remove feature flags.

2020-06-18  Alexey Shvayka  <shvaikalesh@gmail.com>

        Promise built-in functions should be anonymous non-constructors
        https://bugs.webkit.org/show_bug.cgi?id=213317

        Reviewed by Darin Adler.

        This patch makes userland-exposed Promise built-in functions
        non-constructors and sets their "name" properties to empty strings
        as per spec [1], aligning JSC with V8 and SpiderMonkey.

        @createResolvingFunctionsWithoutPromise change is covered by test262's
        async-generator/yield-thenable-create-resolving-functions-*.js cases.

        Promise microbenchmarks are neutral. Promise constructors bytecode is
        unchanged, while @createResolvingFunctions* bytecode is reduced by 2
        instructions.

        [1]: https://tc39.es/ecma262/#sec-ecmascript-standard-built-in-objects

        * builtins/PromiseConstructor.js:
        (nakedConstructor.Promise):
        (nakedConstructor.InternalPromise):
        * builtins/PromiseOperations.js:
        (globalPrivate.newPromiseCapabilitySlow):
        (globalPrivate.createResolvingFunctions):
        (globalPrivate.createResolvingFunctionsWithoutPromise):
        (globalPrivate.createResolvingFunctions.resolve): Deleted.
        (globalPrivate.createResolvingFunctions.reject): Deleted.
        (resolve): Deleted.
        (reject): Deleted.
        * builtins/PromisePrototype.js:
        (globalPrivate.getThenFinally):
        (globalPrivate.getCatchFinally):
        (valueThunk): Deleted.
        (thrower): Deleted.

2020-06-18  Alexey Shvayka  <shvaikalesh@gmail.com>

        TypedArray.prototype.set is incorrect with primitives
        https://bugs.webkit.org/show_bug.cgi?id=212730

        Reviewed by Yusuke Suzuki.

        This change implements step 14 of %TypedArray%.prototype.set [1],
        which coerces primitives to objects instead of throwing an error,
        aligning JSC with V8 and SpiderMonkey.

        [1]: https://tc39.es/ecma262/#sec-%typedarray%.prototype.set-array-offset

        * runtime/JSGenericTypedArrayViewPrototypeFunctions.h:
        (JSC::genericTypedArrayViewProtoFuncSet):

2020-06-17  Mark Lam  <mark.lam@apple.com>

        Replace JSC::FreeList linked list with a Bitmap.
        https://bugs.webkit.org/show_bug.cgi?id=213071

        Reviewed by Filip Pizlo.

        Implement an alternative to the linked list FreeList.  This alternative uses
        a Bitmap to record which atom in the block is available for allocation.

        The intuition here is that allocation using the Bitmap implementation will do:
            2 loads - m_currentRowBitmap, m_currentMarkedBlockRowAddress
            1 store - m_currentRowBitmap

        whereas the linked list implementation will do:
            3 loads - m_scrambledHead, m_secret, result->scrambledNext
            1 store - m_scrambledHead

        and result->scrambledNext is from a different region of code and therefore not
        in the same cache line.

        The downside of the Bitmap implementation is that it uses more instructions.

        This change is currently only enabled for x86_64, which shows about a 0.8%
        progression on Speedometer 2.

        It appears to be about a 1% regression on ARM64E.  Hence, for now, we keep the
        linked list implementation for ARM64 builds.

        This is how the Bitmap FreeList works:

        1. The Bitmap implementation only replaces the linked list implementation.  It
           does not replace the bump allocator.

        2. The Bitmap allocator keeps a m_bitmap that is initialized in
           MarkedBlock::Handle::specializedSweep() to have a bit set for each atom
           location that is available for allocation (i.e. is free).  Note that a cell
           is usually allocated using more than 1 atom.  Only the bit corresponding to
           the first atom (in that cell length range of free atoms) will be set.

           This is consistent with how bits in MarkedBlock::Footer::m_marks and
           MarkedBlock::Footer::m_newlyAllocated are set i.e. only the bit for the first
           atom in the cell can be set.

        3. The allocation algorithm thinks of the MarkedBlock as consisting of rows
           of atoms, where the number of atoms in a row equals the number of bits in
           a AtomsBitmap::Word.  On 64-bit CPUs, this would be 64.

           We will start allocating from the last (highest numbered) row down to the
           first (row 0).  As we allocate, we will only update m_currentRowIndex and
           m_currentRowBitmap.  m_bitmap will not be updated.  This is so in order to
           reduce the number of instructions executed during an allocation.

           When m_currentRowIndex points to N, the AtomsBitmap::Word for row N in
           m_bitmap will have been copied into m_currentRowBitmap.  This is the row
           that we will be allocating from until the row is exhausted.

           This is how we know whether an atom is available for allocation or not:
             i. Atoms in any rows above m_currentRowIndex are guaranteed to be
                allocated already (because we allocate downwards), and hence, are not
                available.
            ii. For row m_currentRowIndex, m_currentRowBitmap is the source of truth
                on which atoms in the row are available for allocation.
           iii. For rows below m_currentRowIndex, m_bitmap is the source of truth on
                which atoms are available for allocation.

           When m_currentRowIndex reaches 0, the info in m_bitmap is completely
           obsoleted, and m_currentRowBitmap holds the availability info for row 0.
           When both m_currentRowIndex and m_currentRowBitmap are 0, then we have
           completely exhausted the block and no more atoms are available for
           allocation.

        4. Allocation happens in 3 paths: fast, middle, slow.

           The fast path checks m_currentRowBitmap.  If it's not 0, then we compute the
           bit number of the lowest set bit in it.  That bit number will be used together
           with m_currentMarkedBlockRowAddress to compute the address of the atom
           location available for allocation.  m_currentRowBitmap will be updated to clear
           the bit for the atom that has just ben allocated.

           If m_currentRowBitmap is 0, then we'll go to the middle path.

           The middle path checks m_currentRowIndex to see if we have more rows to allocate
           from.  For each m_currentRowIndex, we check its corresponding AtomsBitmap::Word
           in m_bitmap.  If the word is non-zero, we copy it to m_currentRowBitmap and
           jump to the fast path to do the allocation.  The middle path will update
           m_currentRowIndex to point to the current row we're allocating from.

           If we have decremented m_currentRowIndex down to 0 but still can't find a
           non-zero AtomsBitmap::Word in m_bitmap, then the block has been exhausted, and
           we'll go to the slow path.

           The slow path is analogous to the old slow path i.e. we try to refill the
           LocalAllocator with a new MarkedBlock.

        5. On the layout of fields in FreeList (see changes in FreeList.h), we try to
           preserve the positions of the bump allocator fields.  The only change we made
           there is in the location of m_cellSize.  It is now moved up next to m_remaining,
           and m_originalSize is moved down.  This is because m_originalSize is only
           accessed in the slow path, and m_cellSize is accessed in the bump allocation
           path.

           Next, we try to put Bitmap allocation fields where the linked list fields
           would have been.  The one bit of trickiness is that we'll put
           m_currentMarkedBlockRowAddress in a union with m_payloadEnd.  This is because
           m_payloadEnd is only used in the bump allocation path.  If m_remaining is 0,
           then we can reuse this location for m_currentMarkedBlockRowAddress.

           With this, we would have 4 bytes of padding after m_currentRowIndex.  For
           compactness, we put m_originalSize there in that space.  For builds that use
           the linked list implementation, m_originalSize will be located below after
           m_cellSize.

        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::allocateHeapCell):
        * heap/FreeList.cpp:
        (JSC::FreeList::clear):
        (JSC::FreeList::initializeAtomsBitmap):
        (JSC::FreeList::initializeBump):
        (JSC::FreeList::contains const):
        (JSC::FreeList::dump const):
        * heap/FreeList.h:
        (JSC::FreeList::bitmapIsEmpty const):
        (JSC::FreeList::allocationWillFail const):
        (JSC::FreeList::offsetOfCurrentRowBitmap):
        (JSC::FreeList::offsetOfBitmapRows):
        (JSC::FreeList::offsetOfCurrentRowIndex):
        (JSC::FreeList::offsetOfCurrentMarkedBlockRowAddress):
        (JSC::FreeList::offsetOfRemaining):
        (JSC::FreeList::atomsBitmap):
        (JSC::FreeList::bitmapRows const):
        (JSC::FreeList::offsetOfOriginalSize): Deleted.
        * heap/FreeListInlines.h:
        (JSC::FreeList::allocate):
        (JSC::FreeList::forEach const):
        * heap/LocalAllocator.cpp:
        (JSC::LocalAllocator::isFreeListedCell const):
        * heap/MarkedBlock.h:
        (JSC::MarkedBlock::Handle::atomAt const):
        * heap/MarkedBlockInlines.h:
        (JSC::MarkedBlock::Handle::specializedSweep):
        * jit/AssemblyHelpers.cpp:
        (JSC::AssemblyHelpers::emitAllocateWithNonNullAllocator):
        * jit/AssemblyHelpers.h:
        (JSC::AssemblyHelpers::emitAllocateWithNonNullAllocator):

2020-06-17  Mark Lam  <mark.lam@apple.com>

        StructureIDTable::validate() doesn't work when compiled with GCC.
        https://bugs.webkit.org/show_bug.cgi?id=213302
        <rdar://problem/64452172>

        Reviewed by Yusuke Suzuki.

        I was previously using ensureStillAliveHere() to force the validation load to
        not be elided.  However, this is not how ensureStillAliveHere() works.  The proper
        way to force the load is to use a volatile pointer instead, which is applied in
        this patch.

        With Clang, the ensureStillAliveHere() happened to do what I expected, but with
        GCC it did not.  The compiler is at liberty to elide the load because there is
        no memory clobbering operation between the load and the call to
        ensureStillAliveHere().  Switching to using the volatile pointer solution.

        * runtime/StructureIDTable.h:
        (JSC::StructureIDTable::validate):

2020-06-17  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Freeze JSBigInt when setting it as a constant in AI
        https://bugs.webkit.org/show_bug.cgi?id=213310
        <rdar://problem/64450410>

        Reviewed by Mark Lam.

        JSCells should be explicitly frozen via DFG::Graph::freeze or DFG::Graph::freezeStrong. And heap JSBigInt is JSCell.
        We should freeze it before setting it as a parameter of setConstant in AI. We use DFG::Graph::freeze since we know
        that this is coming from somewhere in DFG graph: this ToNumeric node itself is not newly producing this JSBigInt.

        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):

2020-06-17  Keith Miller  <keith_miller@apple.com>

        $vm.haveABadTime/isHavingABadTime should work with non-globalObject parameters
        https://bugs.webkit.org/show_bug.cgi?id=213304

        Reviewed by Mark Lam.

        Previously, $vm.haveABadTime would crash if passed a
        non-globalObject object as the first parameter because it was
        missing a `return` in front the error handling case. This patch
        resolves that issue but also extends the semantics of
        haveABadTime/isHavingABadTime to either use the global object of
        the first parameter even if it's not a JSGlobalObject. If no
        argument is passed, haveABadTime/isHavingABadTime instead use the
        global object of the callee.

        * tools/JSDollarVM.cpp:
        (JSC::functionHaveABadTime):
        (JSC::functionIsHavingABadTime):

2020-06-17  Mark Lam  <mark.lam@apple.com>

        Gardening: move some unused data inside ENABLE(JIT) to unbreak the CLoop build.
        https://bugs.webkit.org/show_bug.cgi?id=213255

        Not reviewed.

        * assembler/testmasm.cpp:

2020-06-17  Yusuke Suzuki  <ysuzuki@apple.com>

        Unreviewed, avoid node access in link-task
        https://bugs.webkit.org/show_bug.cgi?id=213266
        <rdar://problem/64453001>

        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileCheckJSCast):

2020-06-17  Mark Lam  <mark.lam@apple.com>

        Add a shiftAndAdd() emitter in AssemblyHelpers.
        https://bugs.webkit.org/show_bug.cgi?id=213255

        Reviewed by Michael Saboff.

        void shiftAndAdd(RegisterID base, RegisterID index, uint8_t shift, RegisterID dest, Optional<RegisterID> = { });

        Emits code to compute: dest = base + index << shift.

        * assembler/testmasm.cpp:
        (doubleOperands):
        (floatOperands):
        (int32Operands):
        (int64Operands):
        (JSC::testShiftAndAdd):
        (JSC::run):
        (JSC::doubleOperands): Deleted.
        (JSC::floatOperands): Deleted.
        (JSC::int32Operands): Deleted.
        (JSC::int64Operands): Deleted.
        * jit/AssemblyHelpers.h:
        (JSC::AssemblyHelpers::shiftAndAdd):

2020-06-17  Michael Saboff  <msaboff@apple.com>

        [Wasm] Reduce the amount of memory used by the Air register coloring allocator
        https://bugs.webkit.org/show_bug.cgi?id=212106

        Reviewed by Yusuke Suzuki.

        Changed InterferenceEdge to be a templated class so we can instantiate an unsigned
        short version to cut memory in half for code that has less than 2^16 temps.
        Through instrumentation, my testing showed that almost all compilations use the
        16bit implementation.  Although this change is for all B3/Air compilations at O2,
        Wasm compilations are usally larger and therefore get the greatest benefit.

        This allowed increasing the default value for the option webAssemblyBBQFallbackSize,
        with a small increase in memory usage.

        * b3/air/AirAllocateRegistersByGraphColoring.cpp:
        * runtime/OptionsList.h:

2020-06-16  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Check NullSetterFunction under strict-mode context since structure / PropertyCondition are unaware of this
        https://bugs.webkit.org/show_bug.cgi?id=213266

        Reviewed by Mark Lam.

        Our PropertyCondition is tracking the shape of Structure. This is enough for IC except for one case: throwing an error when invoking null setters in strict code.

            "use strict";
            var object = { get value() { return 42; } }
            object.value = 42;

        In the above case, we need to throw an error. Let's consider the following scenario.

            1. Object has valid setter.
            2. IC is buffering OPC which includes (1)'s object in [[Prototype]] hit.
            3. IC commits buffered AccessCase with OPC. And PropertyCondition says Object + setter-offset => Presence.
            4. Object deletes its setter.
            5. Just after (4), DFG concurrently reads buffered committed OPCs.
            6. DFG see that PropertyCondition is valid even after (4) since accessor property does exist.
            7. Set up DFG sequence `GetSetter, Call`.
            8. DFG calls null-setter under strict code, which is not assumed to be called.

        In this patch, we insert NullSetterFunction check before setter invocation under strict mode. In IC, if we see NullSetterFunction,
        we replace the calling target with special function which throws an error. In DFG / FTL, we emit `CheckNotJSCast` DFG node which
        ensures that this setter is not null setter.

        In IC code, we already have null-setter checking code before. So this change does not have any impact in terms of performance.
        In DFG / FTL code, we only insert this check when we do not inline this setter. This is because inlining emits `CheckCell` anyway so
        we can know that this is not NullSetterFunction. And this means that DFG Call opcode exists after CheckNotJSCast. Since Call opcode
        loads the fields of call target anyway, this also does not affect on performance.

        * bytecode/AccessCase.cpp:
        (JSC::AccessCase::generateImpl):
        * bytecode/PolymorphicAccess.cpp:
        (JSC::PolymorphicAccess::regenerate):
        * bytecode/PolymorphicAccess.h:
        (JSC::AccessGenerationState::AccessGenerationState):
        * bytecode/StructureStubInfo.cpp:
        (JSC::StructureStubInfo::addAccessCase):
        * bytecode/StructureStubInfo.h:
        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::handleCall):
        (JSC::DFG::ByteCodeParser::handleInlining):
        (JSC::DFG::ByteCodeParser::handlePutById):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGConstantFoldingPhase.cpp:
        (JSC::DFG::ConstantFoldingPhase::foldConstants):
        * dfg/DFGDoesGC.cpp:
        (JSC::DFG::doesGC):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGNode.h:
        (JSC::DFG::Node::hasClassInfo const):
        * dfg/DFGNodeType.h:
        * dfg/DFGPredictionPropagationPhase.cpp:
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileCheckJSCast):
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGStructureAbstractValue.cpp:
        (JSC::DFG::StructureAbstractValue::isNotSubClassOf const):
        * dfg/DFGStructureAbstractValue.h:
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileNode):
        (JSC::FTL::DFG::LowerDFGToB3::compileCheckJSCast):
        * jit/Repatch.cpp:
        (JSC::tryCacheGetBy):
        (JSC::tryCacheArrayGetByVal):
        (JSC::tryCachePutByID):
        (JSC::tryCacheDeleteBy):
        (JSC::tryCacheInByID):
        (JSC::tryCacheInstanceOf):
        * jit/ThunkGenerators.cpp:
        (JSC::virtualThunkFor):
        * runtime/InternalFunction.cpp:
        (JSC::InternalFunction::finishCreation):
        * runtime/JSCast.h:
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        (JSC::JSGlobalObject::visitChildren):
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::nullSetterStrictFunction const):
        * runtime/JSType.cpp:
        (WTF::printInternal):
        * runtime/JSType.h:
        * runtime/NullSetterFunction.cpp:
        (JSC::NullSetterFunctionInternal::callThrowError):
        (JSC::NullSetterFunction::NullSetterFunction):
        * runtime/NullSetterFunction.h:

2020-06-16  Mark Lam  <mark.lam@apple.com>

        Make Options::useJIT() be the canonical source of truth on whether we should use the JIT.
        https://bugs.webkit.org/show_bug.cgi?id=212556
        <rdar://problem/63780436>

        Reviewed by Saam Barati.

        After r263055, Options::useJIT() always equals VM::canUseJIT() after canUseJIT()
        has been computed.  This patch removes VM::canUseJIT(), and replaces all calls to
        it with calls to Options::useJIT().

        In the old code, VM::canUseJIT() would assert s_canUseJITIsSet to ensure that
        its clients will not access s_canUseJIT before it is initialized.  We not have an
        equivalent mechanism with Options.  This is how it works:

        1. There are 2 new Options flags in the g_jscConfig:
                g_jscConfig.options.isFinalized
                g_jscConfig.options.allowUnfinalizedAccess

           g_jscConfig.options.isFinalized means that all Options values are finalized
           i.e. initialization is complete and ready to be frozen in the Config.

           g_jscConfig.options.isFinalized is set by initializeThreading() by calling
           Options::finalize() once options initialization is complete.

           g_jscConfig.options.allowUnfinalizedAccess is an allowance for clients to
           access Options values before they are finalized.  This is only needed in
           options initialization code where Options values are read and written to.

           g_jscConfig.options.allowUnfinalizedAccess is set and cleared using the
           Options::AllowUnfinalizedAccessScope RAII object.  The few pieces of code that
           do options initialization will instantiate this scope object.

        2. All Options accessors (e.g. Option::useJIT()) will now assert that either
           g_jscConfig.options.allowUnfinalizedAccess or g_jscConfig.options.isFinalized
           is set.

        3. Since r263055, Options::recomputeDependentOptions() ensures that if useJIT() is
           false, all other JIT options (e.g. useBaselineJIT(), useDFTJIT(), useFTLJIT(),
           etc.) are also false.  This patch also adds useBBQJIT() and useOMGJIT() to that
           list.

           With this, checks for useJIT() are now redundant if there's also another JIT
           option check, e.g. useRegExpJIT() or useDFGJIT().  When redundant, this patch
           elides the useJIT() check (which used to be a VM::canUseJIT() check).

        Ideally, we should also introduce a separate abstraction for requested option
        values before finalization than the finalized option values that will be adopted
        by the system.  We'll do this as a separate exercise in a later patch.

        * API/tests/ExecutionTimeLimitTest.cpp:
        (testExecutionTimeLimit):
        * API/tests/FunctionOverridesTest.cpp:
        (testFunctionOverrides):
        * API/tests/PingPongStackOverflowTest.cpp:
        (testPingPongStackOverflow):
        - Removed redundant calls to Options::initialize().

        * API/tests/testapi.c:
        (main):
        - move the call to testExecutionTimeLimit() to after finalizeMultithreadedMultiVMExecutionTest()
          returns.  This is because testExecutionTimeLimit() modifies JIT options at runtime
          as part of its testing.  This can wreak havoc on the rest of the system that expects
          the options to be frozen.  Ideally, we'll find a way for testExecutionTimeLimit() to
          do its work without changing JIT options, but that is not easy to do.  For now,
          we'll just run it at the end as a workaround.

        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::setNumParameters):
        * bytecode/CodeBlock.h:
        (JSC::CodeBlock::numberOfArgumentValueProfiles):
        (JSC::CodeBlock::valueProfileForArgument):
        * dfg/DFGCapabilities.cpp:
        (JSC::DFG::isSupported):
        * heap/Heap.cpp:
        (JSC::Heap::completeAllJITPlans):
        (JSC::Heap::iterateExecutingAndCompilingCodeBlocks):
        (JSC::Heap::gatherScratchBufferRoots):
        (JSC::Heap::removeDeadCompilerWorklistEntries):
        (JSC::Heap::stopThePeriphery):
        (JSC::Heap::suspendCompilerThreads):
        (JSC::Heap::resumeCompilerThreads):
        (JSC::Heap::addCoreConstraints):
        * interpreter/AbstractPC.cpp:
        (JSC::AbstractPC::AbstractPC):
        * jit/JITThunks.cpp:
        (JSC::JITThunks::ctiNativeCall):
        (JSC::JITThunks::ctiNativeConstruct):
        (JSC::JITThunks::ctiNativeTailCall):
        (JSC::JITThunks::ctiNativeTailCallWithoutSavedTags):
        (JSC::JITThunks::ctiInternalFunctionCall):
        (JSC::JITThunks::ctiInternalFunctionConstruct):
        (JSC::JITThunks::hostFunctionStub):
        * jsc.cpp:
        (CommandLine::parseArguments):
        (jscmain):
        * llint/LLIntEntrypoint.cpp:
        (JSC::LLInt::setFunctionEntrypoint):
        (JSC::LLInt::setEvalEntrypoint):
        (JSC::LLInt::setProgramEntrypoint):
        (JSC::LLInt::setModuleProgramEntrypoint):
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::shouldJIT):
        (JSC::LLInt::jitCompileAndSetHeuristics):
        * runtime/InitializeThreading.cpp:
        (JSC::initializeThreading):
        * runtime/JSCConfig.h:
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::numberToStringWatchpointSet):
        * runtime/Options.cpp:
        (JSC::jitEnabledByDefault):
        (JSC::disableAllJITOptions):

        (JSC::Options::initialize):
        - Move the calls to dumpOptionsIfNeeded() and ensureOptionsAreCoherent() to the
          end after all the options have been initialized because this where they belong.

        (JSC::Options::finalize):
        (JSC::Options::setOptions):
        (JSC::Options::setOption):
        (JSC::Options::dumpAllOptions):
        (JSC::Options::ensureOptionsAreCoherent):
        * runtime/Options.h:
        (JSC::Options::AllowUnfinalizedAccessScope::AllowUnfinalizedAccessScope):
        (JSC::Options::AllowUnfinalizedAccessScope::~AllowUnfinalizedAccessScope):
        * runtime/OptionsList.h:
        * runtime/RegExp.cpp:
        (JSC::RegExp::compile):
        (JSC::RegExp::compileMatchOnly):
        * runtime/SymbolTable.h:
        (JSC::SymbolTableEntry::isWatchable const):
        * runtime/VM.cpp:
        (JSC::VM::computeCanUseJIT):
        (JSC::VM::VM):
        (JSC::VM::getHostFunction):
        (JSC::VM::getCTIInternalFunctionTrampolineFor):
        * runtime/VM.h:
        (JSC::VM::isInMiniMode):
        (JSC::VM::canUseJIT): Deleted.
        * wasm/WasmCapabilities.h:
        (JSC::Wasm::isSupported):
        * wasm/WasmOperations.cpp:
        (JSC::Wasm::shouldJIT):
        * wasm/WasmSlowPaths.cpp:
        (JSC::LLInt::shouldJIT):

2020-06-16  Robin Morisset  <rmorisset@apple.com>

        Optimize Air::TmpWidth analysis in IRC
        https://bugs.webkit.org/show_bug.cgi?id=152478

        Reviewed by Filip Pizlo.

        AirTmpWidth currently uses a HashMap to map tmps to their width.
        Since tmps have consecutive indices, we can instead use vectors (one for GP and one for FP tmps).
        As a bonus, we can just compute the width of the tmps of the bank the register allocator is currently looking at.
        This cuts the time spent in the register allocator in JetStream2 by about 100ms out of 3.4s
        (or sometimes 80ms out of 2.4, the bimodality of the time spent is due to a huge function in tagcloud-SP which usually but not always reach the FTL, I'll check later if it can be fixed by tweaking the inliner).

        * b3/air/AirAllocateRegistersByGraphColoring.cpp:
        (JSC::B3::Air::allocateRegistersByGraphColoring):
        * b3/air/AirTmpWidth.cpp:
        (JSC::B3::Air::TmpWidth::TmpWidth):
        (JSC::B3::Air::TmpWidth::recompute):
        * b3/air/AirTmpWidth.h:
        (JSC::B3::Air::TmpWidth::width const):
        (JSC::B3::Air::TmpWidth::requiredWidth):
        (JSC::B3::Air::TmpWidth::defWidth const):
        (JSC::B3::Air::TmpWidth::useWidth const):
        (JSC::B3::Air::TmpWidth::Widths::Widths):
        (JSC::B3::Air::TmpWidth::widths):
        (JSC::B3::Air::TmpWidth::widths const):
        (JSC::B3::Air::TmpWidth::addWidths):
        (JSC::B3::Air::TmpWidth::widthsVector):

2020-06-16  Fujii Hironori  <Hironori.Fujii@sony.com>

        [CMake][Visual Studio] CombinedDomains.json is generated twice in JavaScriptCore.vcxproj and InspectorBackendCommands.vcxproj
        https://bugs.webkit.org/show_bug.cgi?id=213225

        Reviewed by Don Olmstead.

        Since r262203 (Bug 210014) added a new target
        InspectorBackendCommands, CombinedDomains.json is generated twice
        in JavaScriptCore.vcxproj and InspectorBackendCommands.vcxproj.
        This caused unnecessary incremental builds.

        The fundamental issue of this issue was fixed in CMake side.
        <https://gitlab.kitware.com/cmake/cmake/issues/16767>
        However, JavaScriptCore target needs to have a direct or indirect
        dependency of InspectorBackendCommands target for CMake Visual
        Studio generator to eliminate duplicated custom commands.

        * CMakeLists.txt: Added add_dependencies(JavaScriptCore InspectorBackendCommands).

2020-06-16  Mark Lam  <mark.lam@apple.com>

        Add SIGABRT handler for non OS(DARWIN) builds to the jsc shell with the -s option.
        https://bugs.webkit.org/show_bug.cgi?id=213200

        Reviewed by Michael Catanzaro.

        This is needed because non OS(DARWIN) builds uses abort as their "CRASH"ing
        mechanism.

        * jsc.cpp:
        (CommandLine::parseArguments):

2020-06-15  Michael Catanzaro  <mcatanzaro@gnome.org>

        WTF signal machinery is guarded by #if USE(PTHREADS) && HAVE(MACHINE_CONTEXT) but does not use pthreads or machine context
        https://bugs.webkit.org/show_bug.cgi?id=213223

        Reviewed by Mark Lam.

        Use #if OS(UNIX) here too. This should fix stress/ensure-crash.js when
        HAVE(MACHINE_CONTEXT) is false.

        * jsc.cpp:
        (printUsageStatement):
        (CommandLine::parseArguments):

2020-06-15  Pavel Feldman  <pavel.feldman@gmail.com>

        Web Inspector: introduce request interception
        https://bugs.webkit.org/show_bug.cgi?id=207446

        Reviewed by Devin Rousso.

        This change introduces network request interception to the Network 
        protocol domain. It adds Network.interceptWithRequest notification that
        can be continued, modified or fulfilled. NetworkStage enum can now have
        'request' and 'response' values.

        * inspector/protocol/Network.json:

2020-06-15  Tadeu Zagallo  <tzagallo@apple.com>

        op_iterator_open getNext checkpoint needs to declare it uses m_iterator
        https://bugs.webkit.org/show_bug.cgi?id=213106
        <rdar://problem/63416838>

         Reviewed by Keith Miller.

        Currently, we have no way of specifying that a checkpoint uses an operand defined at an earlier
        point in the same bytecode, which is the case for op_iterator_open: we assume that it will have
        already allocated the iterator and stored it in m_iterator by the time we get to the getNext
        checkpoint. In order to support that, we change tmpLivenessForCheckpoint to livenessForCheckpoint
        and allow it to also declare the use of the operands defined within the bytecode.

        * bytecode/BytecodeLivenessAnalysis.cpp:
        (JSC::livenessForCheckpoint):
        (JSC::tmpLivenessForCheckpoint): Deleted.
        * bytecode/BytecodeLivenessAnalysis.h:
        * bytecode/FullBytecodeLiveness.h:
        * dfg/DFGForAllKills.h:
        (JSC::DFG::forAllKilledOperands):
        * dfg/DFGGraph.cpp:
        (JSC::DFG::Graph::isLiveInBytecode):
        * dfg/DFGGraph.h:

2020-06-15  Alexey Shvayka  <shvaikalesh@gmail.com>

        Expand JSObject::defineOwnIndexedProperty() fast path for existing properties
        https://bugs.webkit.org/show_bug.cgi?id=213133

        Reviewed by Yusuke Suzuki.

        This patch expands fast path of JSObject::defineOwnIndexedProperty() to cover existing properties
        if given data descriptor has no falsy attributes, preventing the object from entering SparseMode.
        The optimization is possible due to this invariant: indexed properties of non-SparseMode objects
        have attributes of PropertyAttribute::None (except for typed arrays; added assert covers it).

        PropertyDescriptor::attributesOverridingCurrent() with PropertyAttribute::None descriptor
        is used to support partial descriptors like {value: 1, writable: true}.

        This change advances Object.defineProperty microbenchmark by 35%; array read/write benchmark
        following property redefinition is progressed by a factor of 16 due to avoiding SparseMode.

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

2020-06-15  Robin Morisset  <rmorisset@apple.com>

        testB3::testReportUsedRegistersLateUseFollowedByEarlyDefDoesNotMarkUseAsDead() has a validation failure in debug mode
        https://bugs.webkit.org/show_bug.cgi?id=196103
        <rdar://problem/57808549>

        Reviewed by Keith Miller.

        The problem was trivial: patchpoints were referring to constants that were defined after them.
        Just exchanging the order of the definition was enough to make this test pass.

        * b3/testb3_1.cpp:
        (shouldRun):
        * b3/testb3_7.cpp:
        (testReportUsedRegistersLateUseFollowedByEarlyDefDoesNotMarkUseAsDead):

2020-06-15  Mark Lam  <mark.lam@apple.com>

        Do not install the VMTraps signal handler if Options::useJIT=false.
        https://bugs.webkit.org/show_bug.cgi?id=212543
        <rdar://problem/63772519>

        Reviewed by Keith Miller.

        VMTraps is only needed for JITted code.  Hence, if the JIT is disabled, we should
        set Options::usePollingTraps() to true to indicate that we won't be using VMTraps.

        With this change, we no longer install any signal handling machinery if
        Options::useJIT() is false.

        Because we may still disable the JIT even if useJIT() is true (due to failure to
        allocate JIT memory or a number of other factors), we will also add a check of
        VM::canUseJIT() in initializeThreading(), and disable useJIT() if needed.  Of
        course, this also means we need to call Options::recomputeDependentOptions() to
        make other options consistent with useJIT() being false.

        * runtime/InitializeThreading.cpp:
        (JSC::initializeThreading):
        * runtime/Options.cpp:
        (JSC::disableAllJITOptions):
        (JSC::Options::recomputeDependentOptions):
        (JSC::recomputeDependentOptions): Deleted.
        * runtime/Options.h:
        * runtime/VMTraps.cpp:
        (JSC::VMTraps::initializeSignals):
        * tools/SigillCrashAnalyzer.cpp:
        (JSC::SigillCrashAnalyzer::instance):

2020-06-15  Keith Miller  <keith_miller@apple.com>

        CheckIsConstant should not use BadCache exit kind
        https://bugs.webkit.org/show_bug.cgi?id=213141

        Reviewed by Yusuke Suzuki.

        The BadCache exit kind causes the OSR exit compilers to try to
        update ArrayProfiles.  This is just incorrect for CheckIsConstant
        since the node's origin may not even have an
        ArrayProfile... BadCache also strongly assumes the value it's
        profiling is a cell, which is clearly not always the case for
        CheckIsConstant.

        CheckIsConstant now uses the BadConstantValue (BadValue conflicts
        with macros exported by X11 on GTK) exit kind for all use kinds,
        which is just a rename of BadCell.  All existing places where we
        can emit a CheckIsConstant already have a story for BadConstantValue.

        * bytecode/CallLinkStatus.cpp:
        (JSC::CallLinkStatus::computeFromLLInt):
        (JSC::CallLinkStatus::computeExitSiteData):
        * bytecode/ExitKind.cpp:
        (JSC::exitKindToString):
        * bytecode/ExitKind.h:
        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::handleInlining):
        (JSC::DFG::ByteCodeParser::handleIntrinsicCall):
        (JSC::DFG::ByteCodeParser::handleModuleNamespaceLoad):
        (JSC::DFG::ByteCodeParser::parseBlock):
        (JSC::DFG::ByteCodeParser::handlePutByVal):
        (JSC::DFG::ByteCodeParser::handleCreateInternalFieldObject):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGDoesGC.cpp:
        (JSC::DFG::doesGC):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGNode.h:
        (JSC::DFG::Node::isPseudoTerminal):
        * dfg/DFGNodeType.h:
        * dfg/DFGPredictionPropagationPhase.cpp:
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileCheckIsConstant):
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileNode):
        (JSC::FTL::DFG::LowerDFGToB3::compileCheckIsConstant):
        (JSC::FTL::DFG::LowerDFGToB3::compileCheckBadValue):
        (JSC::FTL::DFG::LowerDFGToB3::compileCheckBadCell): Deleted.

2020-06-15  Yusuke Suzuki  <ysuzuki@apple.com>

        Webkit Feature BigInt on webkit.org
        https://bugs.webkit.org/show_bug.cgi?id=197546

        Reviewed by Sam Weinig.

        Add BigInt entry to JSC features.json.

        * features.json:

2020-06-15  Keith Miller  <keith_miller@apple.com>

        JIT thunks should work on arm64_32
        https://bugs.webkit.org/show_bug.cgi?id=213103

        Reviewed by Saam Barati.

        This patch fixes various issues when running JSC on arm64_32 with
        useJIT=1 and useBaselineJIT=0. In particular this patch makes the
        following changes:

        1) ScalePtr is now just part of the Scale enum and is set based on
        the size of the address space.

        2) MacroAssembler::*Ptr functions call 32/64 bit variants based on
        Address space size rather than cpu architecture. Vetting of callsites
        using Ptr as 64 will happen in future patches since it's hard to
        comprehensively vet.

        3) Add some missing variants of functions for when pointers are 32-bit.

        4) Add a load/storeReg function that stores a full register regardless
        of pointer size for storing/loading callee saves.

        5) numberOfDFGCompiles should report a big number for
        useBaselineJIT=0 as some tests fail by default if useBaselineJIT=0
        but useJIT=1.

        6) Assert BaseIndex has a scale of PtrSize or TimesOne (for pre-scaled
        values) when passed to a load/storePtr function.

        * assembler/AbstractMacroAssembler.h:
        (JSC::AbstractMacroAssembler::timesPtr): Deleted.
        * assembler/MacroAssembler.h:
        (JSC::MacroAssembler::rotateRightPtr):
        (JSC::MacroAssembler::loadPtr):
        (JSC::MacroAssembler::loadPtrWithCompactAddressOffsetPatch):
        (JSC::MacroAssembler::branchPtr):
        (JSC::MacroAssembler::storePtr):
        (JSC::MacroAssembler::shouldBlindDouble):
        (JSC::MacroAssembler::moveDouble):
        (JSC::MacroAssembler::store64):
        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::add32):
        (JSC::MacroAssemblerARM64::signExtend32ToPtr):
        (JSC::MacroAssemblerARM64::loadPtr):
        (JSC::MacroAssemblerARM64::call):
        (JSC::MacroAssemblerARM64::farJump):
        * assembler/MacroAssemblerARMv7.h:
        (JSC::MacroAssemblerARMv7::rotateRight32):
        * assembler/MacroAssemblerMIPS.h:
        (JSC::MacroAssemblerMIPS::rotateRight32):
        * assembler/MacroAssemblerX86.h:
        * assembler/MacroAssemblerX86_64.h:
        * b3/B3LowerMacros.cpp:
        * b3/testb3_6.cpp:
        (testInterpreter):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::emitSwitchIntJump):
        * jit/AssemblyHelpers.cpp:
        (JSC::AssemblyHelpers::emitLoadStructure):
        (JSC::AssemblyHelpers::emitAllocateVariableSized):
        (JSC::AssemblyHelpers::restoreCalleeSavesFromEntryFrameCalleeSavesBuffer):
        (JSC::AssemblyHelpers::copyCalleeSavesToEntryFrameCalleeSavesBufferImpl):
        * jit/AssemblyHelpers.h:
        (JSC::AssemblyHelpers::storeReg):
        (JSC::AssemblyHelpers::loadReg):
        (JSC::AssemblyHelpers::emitMaterializeTagCheckRegisters):
        (JSC::AssemblyHelpers::emitGetFromCallFrameHeaderPtr):
        (JSC::AssemblyHelpers::emitGetFromCallFrameHeader32):
        (JSC::AssemblyHelpers::emitGetFromCallFrameHeader64):
        (JSC::AssemblyHelpers::emitPutToCallFrameHeader):
        * jit/JITOpcodes32_64.cpp:
        (JSC::JIT::emit_op_enumerator_structure_pname):
        (JSC::JIT::emit_op_enumerator_generic_pname):
        * jit/ThunkGenerators.cpp:
        (JSC::nativeForGenerator):
        * runtime/TestRunnerUtils.cpp:
        (JSC::numberOfDFGCompiles):

2020-06-15  Caitlin Potter  <caitp@igalia.com>

        [JSC] add machinery to disable JIT tiers when experimental features are enabled
        https://bugs.webkit.org/show_bug.cgi?id=213193

        Reviewed by Mark Lam.

        A new macro FOR_EACH_JSC_EXPERIMENTAL_OPTION() supplies flags indicating the supported
        JIT tiers (or, in the future, other options) of a particular feature,
        in an easy to understand format. These flags are then used to
        recompute dependent feature flags.

        This should simplify the incremental development of language features.

        * dfg/DFGCapabilities.cpp:
        (JSC::DFG::capabilityLevel):
        * runtime/Options.cpp:
        (JSC::recomputeDependentOptions):
        * runtime/OptionsList.h:

2020-06-15  Keith Miller  <keith_miller@apple.com>

        Signal handlers should have a two phase installation.
        https://bugs.webkit.org/show_bug.cgi?id=213160

        Reviewed by Mark Lam.

        * jsc.cpp:
        (CommandLine::parseArguments):
        (jscmain):
        * runtime/InitializeThreading.cpp:
        (JSC::initializeThreading):
        * runtime/VMTraps.cpp:
        * tools/SigillCrashAnalyzer.cpp:
        (JSC::installCrashHandler):
        * wasm/WasmFaultSignalHandler.cpp:
        (JSC::Wasm::enableFastMemory):
        (JSC::Wasm::prepareFastMemory):
        * wasm/WasmFaultSignalHandler.h:

2020-06-15  Yusuke Suzuki  <ysuzuki@apple.com>

        Unreviewed, fix LLInt
        https://bugs.webkit.org/show_bug.cgi?id=157972

        loadi only takes address.

        * llint/LowLevelInterpreter64.asm:

2020-06-15  Alexey Shvayka  <shvaikalesh@gmail.com>

        super should not depend on __proto__
        https://bugs.webkit.org/show_bug.cgi?id=157972

        Reviewed by Saam Barati.

        Before this change, both super() call [1] and super.property [2] relied on
        Object.prototype.__proto__ to acquire super base, which was observable and
        incorrect if __proto__ gets removed.

        This patch introduces get_prototype_of bytecode, ensuring returned values
        are profiled so the op can be wired to existing DFG and FTL implementations.
        In order to avoid performance regression w/o DFG (__proto__ is optimized via
        IntrinsicGetterAccessCase), fast paths for LLInt and baseline JIT are added
        (64-bit only), utilizing OverridesGetPrototypeOutOfLine type info flag.

        This change aligns JSC with V8 and SpiderMonkey, progressing microbenchmarks/
        super-get-by-{id,val}-with-this-monomorphic.js by 7-10%. SixSpeed is neutral.

        Also, extracts JSValue::getPrototype() method to avoid code duplication and
        utilizes it in objectConstructorGetPrototypeOf(), advancing provided
        microbenchmark by 40%.

        [1]: https://tc39.es/ecma262/#sec-getsuperconstructor (step 5)
        [2]: https://tc39.es/ecma262/#sec-getsuperbase (step 5)

        * builtins/BuiltinNames.h:
        * bytecode/BytecodeIntrinsicRegistry.h:
        * bytecode/BytecodeList.rb:
        * bytecode/BytecodeUseDef.cpp:
        (JSC::computeUsesForBytecodeIndexImpl):
        (JSC::computeDefsForBytecodeIndexImpl):
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::finishCreation):
        * bytecode/Opcode.h:
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitGetPrototypeOf):
        * bytecompiler/BytecodeGenerator.h:
        * bytecompiler/NodesCodegen.cpp:
        (JSC::emitSuperBaseForCallee):
        (JSC::emitGetSuperFunctionForConstruct):
        (JSC::BytecodeIntrinsicNode::emit_intrinsic_getPrototypeOf):
        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::handleIntrinsicGetter):
        (JSC::DFG::ByteCodeParser::parseBlock):
        * dfg/DFGCapabilities.cpp:
        (JSC::DFG::capabilityLevel):
        * dfg/DFGOperations.cpp:
        * jit/IntrinsicEmitter.cpp:
        (JSC::IntrinsicGetterAccessCase::canEmitIntrinsicGetter):
        * jit/JIT.cpp:
        (JSC::JIT::privateCompileMainPass):
        (JSC::JIT::privateCompileSlowCases):
        * jit/JIT.h:
        * jit/JITOpcodes.cpp:
        (JSC::JIT::emit_op_get_prototype_of):
        * llint/LowLevelInterpreter.asm:
        * llint/LowLevelInterpreter64.asm:
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/CommonSlowPaths.h:
        * runtime/JSCJSValue.h:
        * runtime/JSCJSValueInlines.h:
        (JSC::JSValue::getPrototype const):
        * runtime/JSGlobalObjectFunctions.cpp:
        (JSC::globalFuncProtoGetter):
        * runtime/JSObject.cpp:
        (JSC::JSObject::calculatedClassName):
        * runtime/JSObject.h:
        (JSC::JSObject::getPrototype):
        * runtime/JSObjectInlines.h:
        (JSC::JSObject::canPerformFastPutInlineExcludingProto):
        (JSC::JSObject::getPropertySlot):
        (JSC::JSObject::getNonIndexPropertySlot):
        * runtime/JSProxy.h:
        * runtime/JSTypeInfo.h:
        (JSC::TypeInfo::overridesGetPrototype const):
        * runtime/ObjectConstructor.cpp:
        (JSC::objectConstructorGetPrototypeOf):
        * runtime/ProxyObject.h:
        * runtime/Structure.h:
        * runtime/Structure.cpp:
        (JSC::Structure::validateFlags):

2020-06-13  Devin Rousso  <drousso@apple.com>

        Make `errors` an own property of `AggregateError` instead of a prototype accessor
        https://bugs.webkit.org/show_bug.cgi?id=212677

        Reviewed by Yusuke Suzuki.

        * runtime/AggregateError.h:
        (JSC::AggregateError::destroy): Deleted.
        (JSC::AggregateError::subspaceFor): Deleted.
        (JSC::AggregateError::errors): Deleted.
        * runtime/AggregateError.cpp:
        (JSC::AggregateError::AggregateError):
        (JSC::AggregateError::finishCreation): Added.
        (JSC::AggregateError::visitChildren): Deleted.

        * runtime/AggregateErrorPrototype.h:
        * runtime/AggregateErrorPrototype.cpp:
        (JSC::AggregateErrorPrototype::finishCreation):
        (JSC::aggregateErrorPrototypeAccessorErrors): Deleted.
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::initializeAggregateErrorConstructor):

        * runtime/VM.h:
        * runtime/VM.cpp:
        (JSC::VM::VM):
        * heap/Heap.cpp:
        (JSC::Heap::finalizeUnconditionalFinalizers):
        Remove `aggregateErrorSpace` since `AggregateError` doesn't add any new member variables.
        Ensure that it can share an `IsoSubspace` with `ErrorInstance`.

        * runtime/CommonIdentifiers.h:
        Add `errors`.

2020-06-12  Robin Morisset  <rmorisset@apple.com>

        The ||= operator (and similar ones) should produce valid bytecode even if the right side is a static error
        https://bugs.webkit.org/show_bug.cgi?id=213154

        Reviewed by Devin Rousso.

        There were two minor issues here that interacted:
        - emitThrowReferenceError did not take an optional `dst` argument like everything else, and instead always returned a new temporary.
          As a result, the various functions that sometimes did "return emitThrowReferenceError(..);" could return a different RegisterID than the one
          provided to them through `dst`, breaking the invariant stated at the top of the file.
        - ShortCircuitReadModifyResolveNode::emitBytecode used the result of such a function, unnecessarily, and (correctly) relied on the invariant being upheld.
        The combination of these led to the bytecode trying to do a move of a temporary that was only defined in one of the predecessors of the basic block it was on,
        which was caught by validateBytecode.

        I fixed both issues, and verified that either fix is enough to stop the bug.
        I fixed the first because other code may depend on that invariant in more subtle ways.
        I fixed the second because it was just unnecessary complexity and made the code misleading.

        I also reworded the comment at the top of NodesCodegen.cpp based on Keith's explanation and Mark's advice to make it less cryptic.

        * bytecompiler/NodesCodegen.cpp:
        (JSC::ThrowableExpressionData::emitThrowReferenceError):
        (JSC::PostfixNode::emitBytecode):
        (JSC::DeleteBracketNode::emitBytecode):
        (JSC::DeleteDotNode::emitBytecode):
        (JSC::PrefixNode::emitBytecode):
        (JSC::ShortCircuitReadModifyResolveNode::emitBytecode):
        (JSC::AssignErrorNode::emitBytecode):
        * parser/Nodes.h:

2020-06-12  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] el(Greek) characters' upper-case conversion is locale-sensitive
        https://bugs.webkit.org/show_bug.cgi?id=213155
        <rdar://problem/55018467>

        Reviewed by Darin Adler.

        CLDR defines 4 locales which has language-sensitive case conversions. "az", "el", "lt", and "tr", where,

            az = Azerbaijani
            el = Greek
            lt = Lithuanian
            tr = Turkish

        We can ensure it easily like this.

            1. Download CLDR data
            2. `ls common/transforms/*Upper.xml`

                common/transforms/az-Upper.xml
                common/transforms/el-Upper.xml
                common/transforms/lt-Upper.xml
                common/transforms/tr-Upper.xml

        And ECMA-402 String.prototype.{toLocaleLowerCase,toLocaleUpperCase} requires these locales are listed as `availableLocales`.

            > 7. Let availableLocales be a List with language tags that includes the languages for which the Unicode Character
            >    Database contains language sensitive case mappings. Implementations may add additional language tags if they
            >    support case mapping for additional locales.

            https://tc39.es/ecma402/#sup-string.prototype.tolocalelowercase

        This patch adds "el" to our maintained availableLocales list. Previously we only had "az", "lt", and "tr".

        * runtime/StringPrototype.cpp:
        (JSC::toLocaleCase):
        (JSC::stringProtoFuncToLocaleUpperCase):

2020-06-12  Keith Miller  <keith_miller@apple.com>

        Tests expecting a crash should use a signal handler in the JSC CLI process
        https://bugs.webkit.org/show_bug.cgi?id=212479

        Reviewed by Yusuke Suzuki.

        Have the -s option use WTF::Signals and make sure it adds breakpoint catching
        as well.

        * jsc.cpp:
        (printUsageStatement):
        (CommandLine::parseArguments):
        * tools/SigillCrashAnalyzer.cpp:
        (JSC::installCrashHandler):

2020-06-12  Alexey Shvayka  <shvaikalesh@gmail.com>

        AsyncGenerator should await "return" completions
        https://bugs.webkit.org/show_bug.cgi?id=212774

        Reviewed by Ross Kirsling.

        This patch fixes 2 spec discrepancies, observable with async generators if the
        value of "return" completion is a Promise, aligning JSC with V8 and SpiderMonkey.

        * builtins/AsyncGeneratorPrototype.js:
        (onFulfilled):
        This change implements step 8 of AsyncGeneratorYield [1], that is executed after
        step 15 of AsyncGeneratorResumeNext [2] (implemented as @doAsyncGeneratorBodyCall).
        We are safe to rely on [[AsyncGeneratorState]] being "suspendedYield" (set in
        step 6 of AsyncGeneratorYield [1]) instead of adding extra field to AsyncGenerator:
        AsyncGeneratorResumeNext [2] does not overwrite "suspendedYield" state.
        This change fixes most of test262 cases.

        [1]: https://tc39.es/ecma262/#sec-asyncgeneratoryield
        [2]: https://tc39.es/ecma262/#sec-asyncgeneratorresumenext

        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitDelegateYield):
        This change implements step 7.c.iii.1 of yield* runtime semantics [3], that is
        observable only if [[Value]] has userland "then" getter. Awaited result is discarded.
        This change fixes async-generator/yield-star-return-then-getter-ticks.js test262 case.

        [3]: https://tc39.es/ecma262/#sec-generator-function-definitions-runtime-semantics-evaluation

2020-06-12  Ross Kirsling  <ross.kirsling@sony.com>

        Unreviewed, address Darin's feedback on r262890.

        * runtime/IntlObject.cpp:
        (JSC::addScriptlessLocaleIfNeeded):
        Use != instead of < for clarity.

2020-06-12  Adrian Perez de Castro  <aperez@igalia.com>

        Build is broken with EVENT_LOOP_TYPE=GLib
        https://bugs.webkit.org/show_bug.cgi?id=212987

        Reviewed by Konstantin Tokarev.

        * PlatformJSCOnly.cmake: Add sources needed to support the remote inspector to
        JavaScriptCore_SOURCES.

2020-06-11  Saam Barati  <sbarati@apple.com>

        Linear Scan uses the wrong Interval for spills for tmps with roles of early def or late use
        https://bugs.webkit.org/show_bug.cgi?id=213055
        <rdar://problem/59874018>

        Reviewed by Yusuke Suzuki.

        There was a bug in linear scan when computing the live range interval for
        spill tmps that had early defs or late uses.  When linear scan spills a
        tmp, it creates a new tmp that it loads to and stores from, and replaces the old tmp
        with the new tmp, and emits stores/loads around pertinent instructions. The live
        interval for such tmps is small by nature, it's contained in the interval for the
        instruction itself. However, we'd build this interval purely based off the
        original tmp's arg timing. So, for example, let's consider a program like this:
        
        RandoInsn: LateUse:Tmp1, Use:Tmp2, [early = N, late = N+1]
        Let's say that Tmp1's last use is RandoInsn, and it had a def before
        RandoInsn, therefore, its live range will be something like:
        [J where J < N, N+1]
        
        and now imagine we spilled Tmp1 for some reason, and rewrote the
        program to be:
        Move Addr(spill for Tmp1), TmpSpill
        RandoInsn: LateUse:TmpSpill, Use:Tmp2, [early = N, late = N+1]
        
        We used to incorrectly mark the live range for TmpSpill to just be [N+1, N+2).
        However, the bug here is that we neglected that TmpSpill actually had an earlier
        def at [N, N+1). So, the live range for TmpSpill was wrong. This could incorrectly
        lead us to allocate Tmp2 and TmpSpill to the same register, since their live
        ranges may not intersect if Tmp2 dies at RandoInsn.
        
        We also had the symmetric bug for EarlyDefs: we wouldn't account for the
        store-spill that'd happen after something like RandoInsn.
        
        The fix is to account for the loads/stores of spill tmps when assigning
        them a live range.
        
        This patch contains a standalone test in testair. It also fixes crashes we had when
        running B3O1 tests using typed arrays on arm64e since we had patchpoints that utilized
        LateUse for signing and auth.

        * b3/B3Procedure.h:
        * b3/air/AirAllocateRegistersAndStackByLinearScan.cpp:
        * b3/air/testair.cpp:

2020-06-11  Saam Barati  <sbarati@apple.com>

        Replace uses of black/white list with block/allow list
        https://bugs.webkit.org/show_bug.cgi?id=213084

        Reviewed by Keith Miller.

        We should be using racially neutral names in our code. From Chromium style guide:
        
        "Terms such as 'blacklist' and 'whitelist' reinforce the notion that
        black==bad and white==good."

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * Sources.txt:
        * b3/air/AirLowerAfterRegAlloc.cpp:
        (JSC::B3::Air::lowerAfterRegAlloc):
        * dfg/DFGDriver.cpp:
        (JSC::DFG::ensureGlobalDFGAllowlist):
        (JSC::DFG::compileImpl):
        (JSC::DFG::ensureGlobalDFGWhitelist): Deleted.
        * dfg/DFGTierUpCheckInjectionPhase.cpp:
        (JSC::DFG::ensureGlobalFTLAllowlist):
        (JSC::DFG::TierUpCheckInjectionPhase::run):
        (JSC::DFG::ensureGlobalFTLWhitelist): Deleted.
        * heap/MachineStackMarker.cpp:
        * inspector/scripts/codegen/objc_generator.py:
        (ObjCGenerator.should_generate_types_for_domain):
        (ObjCGenerator.should_generate_commands_for_domain):
        (ObjCGenerator.should_generate_events_for_domain):
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::ensureGlobalJITAllowlist):
        (JSC::LLInt::shouldJIT):
        (JSC::LLInt::ensureGlobalJITWhitelist): Deleted.
        * runtime/OptionsList.h:
        * tools/FunctionAllowlist.cpp: Copied from Source/JavaScriptCore/tools/FunctionWhitelist.cpp.
        (JSC::FunctionAllowlist::FunctionAllowlist):
        (JSC::FunctionAllowlist::contains const):
        (JSC::FunctionWhitelist::FunctionWhitelist): Deleted.
        (JSC::FunctionWhitelist::contains const): Deleted.
        * tools/FunctionAllowlist.h: Copied from Source/JavaScriptCore/tools/FunctionWhitelist.h.
        * tools/FunctionWhitelist.cpp: Removed.
        * tools/FunctionWhitelist.h: Removed.

2020-06-11  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Return DisposableCallSiteIndex when destroying GCAwareJITStubRoutineWithExceptionHandler
        https://bugs.webkit.org/show_bug.cgi?id=213069
        <rdar://problem/64205186>

        Reviewed by Saam Barati.

        Inside GCAwareJITStubRoutineWithExceptionHandler::observeZeroRefCount, we are returning DisposableCallSiteIndex to freelist.
        However, GCAwareJITStubRoutineWithExceptionHandler::observeZeroRefCount can be called even if the code of GCAwareJITStubRoutineWithExceptionHandler is
        on the stack. Let's consider the following scenario.

            1. Execute GCAwareJITStubRoutineWithExceptionHandler's code. Set CallSiteIndex to the stack.
            2. Execute more code. (1)'s GCAwareJITStubRoutineWithExceptionHandler's code is on the stack.
            3. (1)'s GCAwareJITStubRoutineWithExceptionHandler's refcount becomes zero.
            4. CallSiteIndex of GCAwareJITStubRoutineWithExceptionHandler is returned.
            5. Execute StackVisitor to construct frames. But we cannot find CodeOrigin corresponding to CallSiteIndex stored in (1) since it is already returned.

        DisposableCallSiteIndex should be returned after ensuring that GCAwareJITStubRoutineWithExceptionHandler's code is not on the stack. Detecting this is the functionality
        what GCAwareJITStubRoutineWithExceptionHandler can offer. It is destroyed after ensuring that GCAwareJITStubRoutineWithExceptionHandler's code is not on the stack.

        This patch delays DisposableCallSiteIndex returning until we destroy owner GCAwareJITStubRoutineWithExceptionHandler. But it is possible that CodeBlock* corresponding to
        GCAwareJITStubRoutineWithExceptionHandler is already destroyed. To avoid this condition, we extract CodeOrigins vector as Ref<DFG::CodeOriginPool> and keep it alive from
        GCAwareJITStubRoutineWithExceptionHandler too. And since CodeOrigin addition / removal happens only from the main thread after finishing the compilation, and
        GCAwareJITStubRoutineWithExceptionHandler's destructor is called from the Heap's finalizer, which must be executed from the main thread, we can just modify it without a lock.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * Sources.txt:
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::newExceptionHandlingCallSiteIndex):
        (JSC::CodeBlock::codeOrigins):
        * bytecode/CodeBlock.h:
        (JSC::CodeBlock::codeOrigin):
        * dfg/DFGCodeOriginPool.cpp: Added.
        (JSC::DFG::CodeOriginPool::addCodeOrigin):
        (JSC::DFG::CodeOriginPool::addUniqueCallSiteIndex):
        (JSC::DFG::CodeOriginPool::lastCallSite const):
        (JSC::DFG::CodeOriginPool::addDisposableCallSiteIndex):
        (JSC::DFG::CodeOriginPool::removeDisposableCallSiteIndex):
        (JSC::DFG::CodeOriginPool::shrinkToFit):
        * dfg/DFGCodeOriginPool.h: Added.
        (JSC::DFG::CodeOriginPool::create):
        (JSC::DFG::CodeOriginPool::get):
        (JSC::DFG::CodeOriginPool::size const):
        * dfg/DFGCommonData.cpp:
        (JSC::DFG::CommonData::shrinkToFit):
        (JSC::DFG::CommonData::addCodeOrigin): Deleted.
        (JSC::DFG::CommonData::addUniqueCallSiteIndex): Deleted.
        (JSC::DFG::CommonData::lastCallSite const): Deleted.
        (JSC::DFG::CommonData::addDisposableCallSiteIndex): Deleted.
        (JSC::DFG::CommonData::removeDisposableCallSiteIndex): Deleted.
        * dfg/DFGCommonData.h:
        (JSC::DFG::CommonData::CommonData):
        * dfg/DFGJITCompiler.cpp:
        (JSC::DFG::JITCompiler::exceptionCheck):
        * dfg/DFGJITCompiler.h:
        (JSC::DFG::JITCompiler::addCallSite):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compilePutById):
        (JSC::FTL::DFG::LowerDFGToB3::compileGetByVal):
        (JSC::FTL::DFG::LowerDFGToB3::compileDelBy):
        (JSC::FTL::DFG::LowerDFGToB3::compileCallOrConstruct):
        (JSC::FTL::DFG::LowerDFGToB3::compileDirectCallOrConstruct):
        (JSC::FTL::DFG::LowerDFGToB3::compileTailCall):
        (JSC::FTL::DFG::LowerDFGToB3::compileCallOrConstructVarargsSpread):
        (JSC::FTL::DFG::LowerDFGToB3::compileCallOrConstructVarargs):
        (JSC::FTL::DFG::LowerDFGToB3::compileCallEval):
        (JSC::FTL::DFG::LowerDFGToB3::compileInById):
        (JSC::FTL::DFG::LowerDFGToB3::compileInstanceOf):
        (JSC::FTL::DFG::LowerDFGToB3::compileLogShadowChickenTail):
        (JSC::FTL::DFG::LowerDFGToB3::getById):
        (JSC::FTL::DFG::LowerDFGToB3::getByIdWithThis):
        (JSC::FTL::DFG::LowerDFGToB3::lazySlowPath):
        (JSC::FTL::DFG::LowerDFGToB3::callPreflight):
        * ftl/FTLSlowPathCall.cpp:
        (JSC::FTL::callSiteIndexForCodeOrigin):
        * jit/GCAwareJITStubRoutine.cpp:
        (JSC::GCAwareJITStubRoutineWithExceptionHandler::GCAwareJITStubRoutineWithExceptionHandler):
        (JSC::GCAwareJITStubRoutineWithExceptionHandler::~GCAwareJITStubRoutineWithExceptionHandler):
        (JSC::GCAwareJITStubRoutineWithExceptionHandler::aboutToDie):
        (JSC::GCAwareJITStubRoutineWithExceptionHandler::observeZeroRefCount):
        * jit/GCAwareJITStubRoutine.h:

2020-06-11  Alexey Shvayka  <shvaikalesh@gmail.com>

        RegExp.prototype getters should throw on cross-realm access
        https://bugs.webkit.org/show_bug.cgi?id=213075

        Reviewed by Saam Barati.

        This patch makes RegExp.prototype getters throw TypeError when called on
        RegExp.prototype object from another realm, aligning JSC with V8 and SpiderMonkey.

        The spec [1] allows same-realm access to avoid breaking the web, while makes
        RegExp.prototype an ordinary object (rather than RegExp instance) where possible.

        [1]: https://tc39.es/ecma262/#sec-get-regexp.prototype.global (step 3.a)

        * runtime/RegExpPrototype.cpp:
        (JSC::regExpProtoGetterGlobal):
        (JSC::regExpProtoGetterIgnoreCase):
        (JSC::regExpProtoGetterMultiline):
        (JSC::regExpProtoGetterDotAll):
        (JSC::regExpProtoGetterSticky):
        (JSC::regExpProtoGetterUnicode):
        (JSC::regExpProtoGetterSource):

2020-06-11  Paulo Matos  <pmatos@igalia.com>

        Add missing include to JSONObject.cpp - non-unified build
        https://bugs.webkit.org/show_bug.cgi?id=213073

        Reviewed by Adrian Perez de Castro.

        * runtime/JSONObject.cpp:

2020-06-10  Ross Kirsling  <ross.kirsling@sony.com>

        REGRESSION(r260697): [Intl] "missing script" locales like zh-TW are no longer mapped
        https://bugs.webkit.org/show_bug.cgi?id=213007

        Reviewed by Darin Adler.

        addMissingScriptLocales was removed from IntlObject when changing our locale resolution to depend more directly
        on ICU, but apparently even latest ICU won't perform this legacy "region implies script" mapping for us.

        ICU 65+ does have uloc_openAvailableByType which will do the trick, so perhaps we should use this in the future,
        but it still doesn't seem to help us with Collator, which has its own separate set of "available locales".

        The exact set of locales which should be mapped is currently under discussion here:
        https://github.com/tc39/ecma402/issues/159
        But the crux seems to be that we should ensure we have an xx-ZZ alias for all available xx-Yyyy-ZZ locales.

        * runtime/IntlObject.cpp:
        (JSC::addScriptlessLocaleIfNeeded):
        (JSC::intlAvailableLocales):
        (JSC::intlCollatorAvailableLocales):

2020-06-10  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] JSCallbackObject::deleteProperty should redirect to Parent::deletePropertyByIndex if propertyName is index
        https://bugs.webkit.org/show_bug.cgi?id=213041
        <rdar://problem/64204300>

        Reviewed by Darin Adler.

        We have an infinite recursion here.

        -> JSCallbackObject::deletePropertyByIndex
            -> JSCell::deleteProperty
                -> JSCallbackObject::deleteProperty
                    -> JSObject::deleteProperty
                        -> JSCallbackObject::deletePropertyByIndex

        When propertyName in JSCallbackObject::deleteProperty is an index, we should go to JSObject::deletePropertyByIndex instead of JSObject::deleteProperty.

        * API/JSCallbackObjectFunctions.h:
        (JSC::JSCallbackObject<Parent>::deleteProperty):

2020-06-09  Mark Lam  <mark.lam@apple.com>

        Stringifier::appendStringifiedValue() should not assume it is always safe to recurse.
        https://bugs.webkit.org/show_bug.cgi?id=213006
        <rdar://problem/64154840>

        Reviewed by Keith Miller.

        In r262727, I suggested that Alexey Shvayka add an assertion in
        Stringifier::appendStringifiedValue() to assert that it is safe to recurse because
        we don't expect it to recurse into itself.  Turns out this is a bad idea because
        a client may be doing the recursing before calling Stringifier::appendStringifiedValue().
        As a result, Stringifier::appendStringifiedValue() ends up being executed with
        the stack pointer already in the reserved zone.  This is legal, and is what the
        reserved zone is intended for as long as we don't recurse from here.  However,
        this also means that asserting vm.isSafeToRecurseSoft() here will surely fail
        because we are already in the reserved zone area.  The fix is simply to remove
        this faulty assertion.

        * runtime/JSONObject.cpp:
        (JSC::Stringifier::appendStringifiedValue):

2020-06-09  Mark Lam  <mark.lam@apple.com>

        Disambiguate the OverridesGetPropertyNames structure flag
        https://bugs.webkit.org/show_bug.cgi?id=212909
        <rdar://problem/63823557>

        Reviewed by Saam Barati.

        Previously, the OverridesGetPropertyNames structure flag could mean 2 different
        things:
        1. the getPropertyNames() method is overridden, or
        2. any of the forms of getPropertyName() is overridden:
           getPropertyName, getOwnPropertyNames, getOwnNonIndexPropertyNames

        Some parts of the code expects one definition while other parts expect the other.
        This patch disambiguates between the 2 by introducing OverridesAnyFormOfGetPropertyNames
        for definition (2).  OverridesGetPropertyNames now only means definition (1).

        Note: we could have implemented overridesGetPropertyNames() by doing a comparison
        of the getPropertyNames pointer in the MethodTable.  This is a little slower than
        checking a TypeInfo flag, but probably doesn't matter a lot in the code paths
        where overridesGetPropertyNames() is called.  However, we have bits in TypeInfo
        left.  So, we'll might as well use it.

        This ambiguity resulted in JSObject::getPropertyNames() recursing infinitely
        when it didn't think it could recurse.  This is demonstrated in
        JSTests/stress/unexpected-stack-overflow-below-JSObject-getPropertyNames.js as
        follows:

        1. The test case invokes JSObject::getPropertyNames on a JSArray.

        2. In the while loop at the bottom of JSObject::getPropertynames(), we check
           `if (prototype->structure(vm)->typeInfo().overridesGetPropertyNames()) {`.

        3. The test overrides proto as follows:
           `arg0.__proto__ = arr1` where both arg0 and arr1 are JArrays.

        4. In the old code, JSArray sets OverridesGetPropertyNames but does not override
           getPropertyNames().  It actually meant to set OverridesAnyFormOfGetPropertyNames
           (after we disambiguated it) because JSArray overrides getOwnNonIndexPropertyNames().

        5. When we get to the check at (2), we ask if the prototype overridesGetPropertyNames().
           Since JSArray sets OverridesGetPropertyNames, the answer is yes / true.

           JSObject::getPropertynames() then proceeds to invoke
           `prototype->methodTable(vm)->getPropertyNames(prototype, globalObject, propertyNames, mode);`

           But because JSArray does not actually overrides getPropertyNames(), we're
           actually invoking JSObject::getPropertyNames() here.  Viola!  Infinite loop.

        With this patch, JSArray is disambiguated to set OverridesAnyFormOfGetPropertyNames
        instead of OverridesGetPropertyNames, and this infinite loop no longer exists.

        This patch also made the following changes:

        1. Templatized TypeInfo::isSetOnFlags1() and TypeInfo::isSetOnFlags2() so that
           we can used static_asserts instead of a debug ASSERT to verify the integrity of
           the flag we're checking against.

        2. Added a Structure::validateFlags() called from the Structure constructor.
           validateFlags() will verify the following:
           a. OverridesGetOwnPropertySlot must be set in the flags if getOwnPropertySlot
              is overridden in the MethodTable.
           b. InterceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero must be set in
              the flags if getOwnPropertySlotByIndex is overridden in the MethodTable.
           c. HasPutPropertySecurityCheck must be set in the flags if doPutPropertySecurityCheck
              is overridden in the MethodTable.
           d. OverridesGetPropertyNames must be set in the flags if getPropertyNames
              is overridden in the MethodTable.
           e. OverridesAnyFormOfGetPropertyNames must be set in the flags if any of
              getPropertyNames, getOwnPropertyNames, or getOwnNonIndexPropertyNames are
              overridden in the MethodTable.

           An alternate solution would be to automatically set these flags if we detect
           their corresponding methods are overridden.  However, this alternate solution
           requires this laundry list to be checked every time a structure is constructed.
           The current implementation of having the required flags already pre-determined
           as a constant is more efficient in terms of performance and code space.

           Also, it only takes one instantiation of the structure to verify that the flags
           are valid.  Since we only write JSCell / JSObject classes when we need them
           and we always write tests to exercise new code (especially such classes), we're
           guaranteed the flags validation will be exercised.

        3. Made JSObject::getOwnPropertySlot() and JSObject::doPutPropertySecurityCheck()
           not inlined when ASSERT_ENABLED.  This is needed in order for Structure::validateFlags()
           to do its checks using function pointer comparisons.  Otherwise, the inline
           functions can result in multiple instantiations of these functions.  For
           example, WebCore can get its own copy of JSObject::getOwnPropertySlot() and
           the comparisons will think the function is overridden even when it's not.

        4. Structure::validateFlags() found the following problems which are now fixed:

           GetterSetter was not using its StructureFlags.  As a result, it was missing the
           OverridesGetOwnPropertySlot flag.

           JSDataView did not define its StructureFlags.  It was missing the
           OverridesGetOwnPropertySlot and OverridesAnyFormOfGetPropertyNames flags.

        5. Changed a TypeInfo constructor to not have a default argument for the flags value.
           Also grepped for all uses of this constructor to make sure that it is passed
           the StructureFlags field.  This exercise found the following issue:

           JSAPIValueWrapper was not using its StructureFlags when creating its structure.
           Previously, it was just ignoring the StructureIsImmortal flag in StructureFlags.

        6. Hardened the assertions for hasReadOnlyOrGetterSetterPropertiesExcludingProto()
           and hasGetterSetterProperties() in the Structure constructor.

           Previously, if the flag is set, it verifies that the ClassInfo has the
           appropriate data expected by the flag.  However, it does not assert the reverse
           i.e. that if the ClassInfo data exists, then the flag must also be set.
           The new assertions now checks both.

           Moved the overridesGetCallData() assertion into Structure::validateFlags()
           because it concerns the OverridesGetCallData flag.  This assertion has also
           ben hardened.

        * API/JSAPIValueWrapper.h:
        * API/JSCallbackObject.h:
        * debugger/DebuggerScope.h:
        * inspector/JSInjectedScriptHostPrototype.h:
        * inspector/JSJavaScriptCallFramePrototype.h:
        * runtime/ClonedArguments.h:
        * runtime/ErrorInstance.h:
        * runtime/GenericArguments.h:
        * runtime/GetterSetter.h:
        * runtime/JSArray.h:
        * runtime/JSDataView.h:
        * runtime/JSFunction.h:
        * runtime/JSGenericTypedArrayView.h:
        * runtime/JSGlobalObject.h:
        * runtime/JSLexicalEnvironment.h:
        * runtime/JSModuleEnvironment.h:
        * runtime/JSModuleNamespaceObject.h:
        * runtime/JSObject.cpp:
        (JSC::JSObject::doPutPropertySecurityCheck):
        (JSC::JSObject::getOwnPropertySlot):
        * runtime/JSObject.h:
        (JSC::JSObject::getOwnPropertySlotImpl):
        (JSC::JSObject::getOwnPropertySlot):
        * runtime/JSProxy.h:
        * runtime/JSString.h:
        * runtime/JSSymbolTableObject.h:
        * runtime/JSTypeInfo.h:
        (JSC::TypeInfo::TypeInfo):
        (JSC::TypeInfo::masqueradesAsUndefined const):
        (JSC::TypeInfo::implementsHasInstance const):
        (JSC::TypeInfo::implementsDefaultHasInstance const):
        (JSC::TypeInfo::overridesGetCallData const):
        (JSC::TypeInfo::overridesToThis const):
        (JSC::TypeInfo::structureIsImmortal const):
        (JSC::TypeInfo::overridesGetPropertyNames const):
        (JSC::TypeInfo::overridesAnyFormOfGetPropertyNames const):
        (JSC::TypeInfo::prohibitsPropertyCaching const):
        (JSC::TypeInfo::getOwnPropertySlotIsImpure const):
        (JSC::TypeInfo::getOwnPropertySlotIsImpureForPropertyAbsence const):
        (JSC::TypeInfo::hasPutPropertySecurityCheck const):
        (JSC::TypeInfo::newImpurePropertyFiresWatchpoints const):
        (JSC::TypeInfo::isImmutablePrototypeExoticObject const):
        (JSC::TypeInfo::interceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero const):
        (JSC::TypeInfo::isSetOnFlags1 const):
        (JSC::TypeInfo::isSetOnFlags2 const):
        * runtime/ObjectConstructor.cpp:
        (JSC::objectConstructorAssign):
        * runtime/ProxyObject.h:
        * runtime/RegExpObject.h:
        * runtime/StringObject.h:
        * runtime/Structure.cpp:
        (JSC::Structure::validateFlags):
        (JSC::Structure::Structure):
        * runtime/Structure.h:
        * runtime/StructureInlines.h:
        (JSC::Structure::canCacheOwnKeys const):
        * tools/JSDollarVM.cpp:

2020-06-09  Jonathan Bedard  <jbedard@apple.com>

        JavaScriptCore: Support tvOS and watchOS builds with the public SDK
        https://bugs.webkit.org/show_bug.cgi?id=212788
        <rdar://problem/64000087>

        Reviewed by Tim Horton.

        * Configurations/Base.xcconfig: Link to tvOS and watchOS framework stubs.
        * Configurations/JavaScriptCore.xcconfig: Use iOS flags for all embedded platforms.

2020-06-09  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Shrink __DATA,(__data,__bss,__common) more
        https://bugs.webkit.org/show_bug.cgi?id=212863

        Reviewed by Sam Weinig.

        1. Use `unsigned` instead of `size_t` in GC size-class array. We know that this number never exceeds largeCutoff,
           which must be much maller than UINT32_MAX.
        2. Add missing const to various variables to put them DATA,__const instead of DATA,__data etc.

        * heap/MarkedSpace.cpp:
        (JSC::MarkedSpace::initializeSizeClassForStepSize):
        * heap/MarkedSpace.h:
        * heap/VisitRaceKey.cpp:
        * heap/VisitRaceKey.h:
        * inspector/agents/InspectorDebuggerAgent.cpp:
        * inspector/agents/InspectorDebuggerAgent.h:
        * runtime/PropertyDescriptor.cpp:
        * runtime/PropertyDescriptor.h:

2020-06-08  Keith Miller  <keith_miller@apple.com>

        Removed unneeded POINTER_WIDTH macro from b3
        https://bugs.webkit.org/show_bug.cgi?id=212927

        Reviewed by Yusuke Suzuki.

        C++20 has real constexpr functions so we don't need the
        POINTER_WIDTH macro anymore.

        * b3/B3Width.h:
        (JSC::B3::pointerWidth):
        * b3/air/opcode_generator.rb:

2020-06-08  Alexey Shvayka  <shvaikalesh@gmail.com>

        JSON.stringify should throw stack overflow error
        https://bugs.webkit.org/show_bug.cgi?id=143511

        Reviewed by Ross Kirsling and Mark Lam.

        This change adds m_holderStack.size() check, reusing the limit of JSON.parse,
        and throws StackOverflowError if exceeded, aligning JSC with V8 and SpiderMonkey.
        Even with all the cyclic structure checks in place, excess is possible due to
        very deeply nested object, user-provided "toJSON" method or functional replacer.

        While Stringifier::appendStringifiedValue() and Holder::appendNextProperty()
        mutually call each other, recursion is avoided by !holderStackWasEmpty check and
        do/while loop at the end of appendStringifiedValue(), as well as cyclic structure
        check as per spec [1].

        [1]: https://tc39.es/ecma262/#sec-serializejsonobject (step 1)

        * runtime/JSONObject.cpp:
        (JSC::Stringifier::appendStringifiedValue):
        (JSC::Walker::walk):

2020-06-08  Jonathan Bedard  <jbedard@apple.com>

        JavaScriptCore: Fix PLATFORM(TVOS) macro
        https://bugs.webkit.org/show_bug.cgi?id=212900
        <rdar://problem/64118879>

        Unreviewed build fix.

        * tools/JSDollarVM.cpp:
        (JSC::functionIsMemoryLimited): PLATFORM(TVOS) should be PLATFORM(APPLETV).

2020-06-07  Philippe Normand  <pnormand@igalia.com>

        Remove ENABLE_VIDEO_TRACK ifdef guards
        https://bugs.webkit.org/show_bug.cgi?id=212568

        Reviewed by Youenn Fablet.

        * Configurations/FeatureDefines.xcconfig: Remove ENABLE_VIDEO_TRACK, which is now enabled by
        default under the ENABLE_VIDEO guard.

2020-06-07  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Checksum for generated files should be emitted at the end of the files
        https://bugs.webkit.org/show_bug.cgi?id=212875

        Reviewed by Mark Lam.

        If the offlineasm file generation is interrupted in the middle of the generation, it already emitted checksum.
        So next file generation can accept this broken file as a result of offlineasm and skip file generation.
        We should emit checksum at the end of files. For now, this patch takes a quick way: just iterating lines, getting
        a last line and use it for checksum comparison.

        * generator/GeneratedFile.rb:
        * offlineasm/asm.rb:

2020-06-06  Mark Lam  <mark.lam@apple.com>

        Make CodeBlockHash robust against unreasonably long source code.
        https://bugs.webkit.org/show_bug.cgi?id=212847
        <rdar://problem/64024279>

        Reviewed by Saam Barati.

        This patch adds a heuristic to avoid trying to compute the CodeBlockHash on
        unreasonably long source code strings.  This is done by first applying a length
        check and, if needed, computing the hash with an alternate method.

        This is OK to do because:
        1. CodeBlockHash is not a critical hash.
        2. In practice, reasonable source code are not that long.
        3. And if they are that long, then we are still diversifying the hash on their
           length. But if they do collide, it's OK.

        The only invariant here is that we should always produce the same hash for the
        same source string.  Since the algorithm is deterministic, this invariant is not
        violated.

        * bytecode/CodeBlockHash.cpp:
        (JSC::CodeBlockHash::CodeBlockHash):

2020-06-06  Devin Rousso  <drousso@apple.com>

        Web Inspector: unify the naming scheme for agents used by instrumentation
        https://bugs.webkit.org/show_bug.cgi?id=212859

        Reviewed by Timothy Hatcher.

        Inspector agents fall into one of three categories:
         - "persistent" when Web Inspector is connected
         - "enabled" when that agent is `enable`d, such as if the corresponding tab is visible
         - "tracking" when that agent is part of a timeline recording.

        The only exception to this is the Console agent, as that exists regardless of whether Web
        Inspector is connected as it needs to preserve messages logged before Web Inspector connects.

        Also remove the "Inspector" prefix from getter/setter methods as it adds confusion if that
        agent also has subclasses (e.g. `InspectorRuntimeAgent` and `PageRuntimeAgent`).

        * inspector/JSGlobalObjectConsoleClient.h:
        * inspector/JSGlobalObjectInspectorController.cpp:
        * inspector/agents/InspectorConsoleAgent.h:

2020-06-05  Michael Saboff  <msaboff@apple.com>

        Make FAST_JIT_PERMISSIONS check in LinkBuffer::copyCompactAndLinkCode a runtime check
        https://bugs.webkit.org/show_bug.cgi?id=212825

        Reviewed by Saam Barati.

        Added useFastJITPermissions() for runtime checks of FAST_JIT_PERMISSIONS
        including the cases where it is conditional on OS settings. This is now
        used in a few places to declutter the code.

        When using the fast JIT permissions path, the JIT memory is the direct output
        of the linking. Modified BranchCompactionLinkBuffer to hold a pointer to that
        output "buffer" or a temporarily allocated buffer depending on if fast JIT
        permissions are enabled.

        Broke out the "verify hash" conditionally compiled code with a file local
        ENABLE_VERIFY_JIT_HASH macro for readability.

        * assembler/LinkBuffer.cpp:
        (JSC::BranchCompactionLinkBuffer::BranchCompactionLinkBuffer):
        (JSC::BranchCompactionLinkBuffer::~BranchCompactionLinkBuffer):
        Changed this to use a provided buffer or a malloc'ed buffer. When using
        a malloc'ed buffer, we put it in a thread local cache.

        (JSC::LinkBuffer::copyCompactAndLinkCode):
        * jit/ExecutableAllocator.h:
        (JSC::useFastJITPermissions):
        (JSC::performJITMemcpy):

2020-06-05  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Put dfgOpNames in __DATA,__const section instead of __DATA,__data
        https://bugs.webkit.org/show_bug.cgi?id=212840

        Reviewed by Saam Barati.

        dfgOpNames array itself is not const annotated, and the compiler makes it __DATA,__data instead of __DATA,__const.
        We should annotate it with const to ensure that this is compiled into __DATA,__const. We also remove unused CallFrame::describeFrame
        since it allocates some bss memory, while we have more sophisticated mechanism (VMInspector) for this functionality and this function
        is no longer used.

        * dfg/DFGDoesGCCheck.cpp:
        (JSC::DFG::DoesGCCheck::verifyCanGC):
        * dfg/DFGGraph.cpp:
        * dfg/DFGGraph.h:
        * interpreter/CallFrame.cpp:
        (JSC::CallFrame::describeFrame): Deleted.
        * interpreter/CallFrame.h:

2020-06-05  Tadeu Zagallo  <tzagallo@apple.com>

        REGRESSION(r262523): Fix testb3
        https://bugs.webkit.org/show_bug.cgi?id=212791

        Reviewed by Mark Lam.

        * b3/testb3_1.cpp:
        (run):
        (main):

2020-06-05  Paulo Matos  <pmatos@igalia.com>

        Add missing ECMAMode header to fix NonUnified Build
        https://bugs.webkit.org/show_bug.cgi?id=212838

        Reviewed by Darin Adler.

        * bytecode/PutByValFlags.h:

2020-06-05  Saam Barati  <sbarati@apple.com>

        Audit safe to execute
        https://bugs.webkit.org/show_bug.cgi?id=207075
        <rdar://problem/59085094>

        Reviewed by Yusuke Suzuki.

        This audit found one interesting case for DOMJIT nodes. We emit safety checks
        for CallDOM/CallDOMGetter inside fixup phase and the bytecode parser. When
        determining if these nodes are safe to execute, we need to also ensure that
        these checks hold.
        
        I've also added a helper to JSDollarVM to ensure that this patch doesn't break
        LICM of DOMJIT.
        
        This patch also moves some nodes we will never hoist to return false.

        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::handleDOMJITGetter):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::attemptToMakeCallDOM):
        * dfg/DFGNode.h:
        (JSC::DFG::Node::classInfo):
        (JSC::DFG::Node::requiredDOMJITClassInfo):
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * tools/JSDollarVM.cpp:
        (JSC::functionCreateDOMJITGetterNoEffectsObject):
        (JSC::JSDollarVM::finishCreation):

2020-06-05  Devin Rousso  <drousso@apple.com>

        Logical Assignment: perform NamedEvaluation of anonymous functions
        https://bugs.webkit.org/show_bug.cgi?id=212679

        Reviewed by Ross Kirsling.

        * parser/ASTBuilder.h:
        (JSC::ASTBuilder::makeAssignNode):

2020-06-05  Yusuke Suzuki  <ysuzuki@apple.com>

        DOM constructor should only accept Ref<> / ExceptionOr<Ref<>> for creation to ensure toJSNewlyCreated is always returning object
        https://bugs.webkit.org/show_bug.cgi?id=212767

        Reviewed by Darin Adler.

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

2020-06-05  Andy Estes  <aestes@apple.com>

        [Apple Pay] Remove conditionals for ENABLE_APPLE_PAY_SESSION_V(3|4)
        https://bugs.webkit.org/show_bug.cgi?id=212541
        <rdar://problem/63781452>

        Reviewed by Darin Adler.

        APPLE_PAY_SESSION_V(3|4) is now enabled whenever APPLE_PAY itself is enabled.

        * Configurations/FeatureDefines.xcconfig:

2020-06-05  Caitlin Potter  <caitp@igalia.com>

        [JSC] Add support for private class fields
        https://bugs.webkit.org/show_bug.cgi?id=206431

        Reviewed by Saam Barati.

        Expanding upon the earlier public class fields patch, we implement the remaining (and
        significant parts) of the instance fields (https://tc39.es/proposal-class-fields/).

        There are a variety of key changes here:

            - Parser now understands the concept of private names (Token PRIVATENAME).
            - 1 new opcode (op_get_private_name), one changed opcode (op_put_by_val_direct).
            - A method for creating Symbol objects with a null PrivateSymbolImpl is exposed as a
              LinkTimeConstant (@createPrivateSymbol).
            - Null Private Symbols are stored by name (not a valid identifier) in a JSScope, and
              are loaded from the outer scope whenever they are used by the modified opcodes.

        The changes to op_put_by_val_direct include a new bytecode operand (PutByValFlags) which are
        used to distinguish between overwriting or defining a new private field. Specifically, when it
        comes to private field accesses, it's necessary to throw an exception when accessing a field
        which does not exist, or when attempting to define a private field which has already been
        defined.

        During the evaluation of a class expression, before the class element list is evaluated (in case
        any computed property names expressions refer to a new private field), a new PrivateSymbol is
        created for each individual private field name, and stored in the class lexical scope.

        Private field names are loaded from scope before their use. This prevents multiple evaluations
        of the same class source from accessing each other's private fields, because the values of the
        symbols loaded from the class scope would be distinct. This is required by the proposal text,
        and is the key reason why we use ByVal lookups rather than ById lookups.

        To illustrate, typical private field access will look like:

        <Field Reads>
        resolve_scope      <scope=>, <currentScope>, "#x", GlobalProperty, 0
        get_from_scope     <symbol=>, <scope>, "#x", 1050624<DoNotThrowIfNotFound|GlobalProperty|NotInitialization>, 0, 0
        get_private_name   <value=>, <receiver --- probably 'this'>, <symbol>

        <Field Writes>
        resolve_scope      <scope=>, <currentScope>, "#x", GlobalProperty, 0
        get_from_scope     <symbol=>, <scope>, "#x", 1050624<DoNotThrowIfNotFound|GlobalProperty|NotInitialization>, 0, 0
        put_by_val_direct  <receiver, probably 'this'>, <symbol>, <value>, <PutByValPrivateName>

        <Field Definition>
        resolve_scope      <scope=>, <currentScope>, "#x", GlobalProperty, 0
        get_from_scope     <symbol=>, <scope>, "#x", 1050624<DoNotThrowIfNotFound|GlobalProperty|NotInitialization>, 0, 0
        put_by_val_direct  <receiver, probably 'this'>, <symbol>, <value>, <PutByValPrivateName|PutByValThrowIfExists>

        The feature is currently hidden behind the feature flag JSC::Options::usePrivateClassFields.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * Sources.txt:
        * builtins/BuiltinNames.h:
        * bytecode/BytecodeList.rb:
        * bytecode/BytecodeUseDef.cpp:
        (JSC::computeUsesForBytecodeIndexImpl):
        (JSC::computeDefsForBytecodeIndexImpl):
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::finalizeLLIntInlineCaches):
        * bytecode/Fits.h:
        * bytecode/LinkTimeConstant.h:
        * bytecode/PutByValFlags.cpp: Copied from Source/JavaScriptCore/bytecode/PutKind.h.
        (WTF::printInternal):
        * bytecode/PutByValFlags.h: Added.
        (JSC::PutByValFlags::create):
        (JSC::PutByValFlags::createDirect):
        (JSC::PutByValFlags::createDefinePrivateField):
        (JSC::PutByValFlags::createPutPrivateField):
        (JSC::PutByValFlags::isDirect const):
        (JSC::PutByValFlags::ecmaMode const):
        (JSC::PutByValFlags::privateFieldAccessKind const):
        (JSC::PutByValFlags::isPrivateFieldAccess const):
        (JSC::PutByValFlags::isPrivateFieldPut const):
        (JSC::PutByValFlags::isPrivateFieldAdd const):
        (JSC::PutByValFlags::PutByValFlags):
        * bytecode/PutKind.h:
        * bytecode/UnlinkedFunctionExecutable.cpp:
        (JSC::generateUnlinkedFunctionCodeBlock):
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::instantiateLexicalVariables):
        (JSC::BytecodeGenerator::emitDirectGetByVal):
        (JSC::BytecodeGenerator::emitDirectPutByVal):
        (JSC::BytecodeGenerator::emitDefinePrivateField):
        (JSC::BytecodeGenerator::emitPrivateFieldPut):
        * bytecompiler/BytecodeGenerator.h:
        * bytecompiler/NodesCodegen.cpp:
        (JSC::PropertyListNode::emitDeclarePrivateFieldNames):
        (JSC::PropertyListNode::emitBytecode):
        (JSC::PropertyListNode::emitPutConstantProperty):
        (JSC::DotAccessorNode::emitBytecode):
        (JSC::BaseDotNode::emitGetPropertyValue):
        (JSC::BaseDotNode::emitPutProperty):
        (JSC::FunctionCallDotNode::emitBytecode):
        (JSC::PostfixNode::emitDot):
        (JSC::PrefixNode::emitDot):
        (JSC::AssignDotNode::emitBytecode):
        (JSC::ReadModifyDotNode::emitBytecode):
        (JSC::DefineFieldNode::emitBytecode):
        (JSC::ClassExprNode::emitBytecode):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ecmaMode):
        (JSC::DFG::ecmaMode<OpPutByValDirect>):
        (JSC::DFG::ByteCodeParser::handlePutByVal):
        * dfg/DFGCapabilities.cpp:
        (JSC::DFG::capabilityLevel):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::cachedPutById):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compilePutById):
        * generator/DSL.rb:
        * jit/ICStats.h:
        * jit/JIT.cpp:
        (JSC::JIT::privateCompileMainPass):
        * jit/JIT.h:
        * jit/JITInlineCacheGenerator.cpp:
        (JSC::JITPutByIdGenerator::JITPutByIdGenerator):
        (JSC::JITPutByIdGenerator::slowPathFunction):
        * jit/JITInlineCacheGenerator.h:
        (JSC::JITPutByIdGenerator::JITPutByIdGenerator):
        * jit/JITInlines.h:
        (JSC::JIT::ecmaMode):
        (JSC::JIT::ecmaMode<OpPutById>):
        (JSC::JIT::ecmaMode<OpPutByValDirect>):
        (JSC::JIT::privateFieldAccessKind):
        (JSC::JIT::privateFieldAccessKind<OpPutByValDirect>):
        * jit/JITOperations.cpp:
        (JSC::putPrivateField):
        (JSC::definePrivateField):
        * jit/JITOperations.h:
        * jit/JITPropertyAccess.cpp:
        (JSC::JIT::emitPutByValWithCachedId):
        (JSC::JIT::emitSlow_op_put_by_val):
        (JSC::JIT::emit_op_put_by_id):
        * jit/JITPropertyAccess32_64.cpp:
        (JSC::JIT::emitSlow_op_put_by_val):
        (JSC::JIT::emit_op_put_by_id):
        * jit/Repatch.cpp:
        (JSC::appropriateGenericPutByIdFunction):
        (JSC::appropriateOptimizingPutByIdFunction):
        (JSC::tryCachePutByID):
        * llint/LLIntOffsetsExtractor.cpp:
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
        * llint/LLIntSlowPaths.h:
        * llint/LowLevelInterpreter32_64.asm:
        * llint/LowLevelInterpreter64.asm:
        * parser/ASTBuilder.h:
        (JSC::ASTBuilder::createDotAccess):
        (JSC::ASTBuilder::isPrivateLocation):
        (JSC::ASTBuilder::makeFunctionCallNode):
        (JSC::ASTBuilder::makeAssignNode):
        * parser/Lexer.cpp:
        (JSC::Lexer<LChar>::parseIdentifier):
        (JSC::Lexer<UChar>::parseIdentifier):
        (JSC::Lexer<CharacterType>::parseIdentifierSlowCase):
        (JSC::Lexer<T>::lexWithoutClearingLineTerminator):
        * parser/NodeConstructors.h:
        (JSC::BaseDotNode::BaseDotNode):
        (JSC::DotAccessorNode::DotAccessorNode):
        (JSC::FunctionCallDotNode::FunctionCallDotNode):
        (JSC::CallFunctionCallDotNode::CallFunctionCallDotNode):
        (JSC::ApplyFunctionCallDotNode::ApplyFunctionCallDotNode):
        (JSC::HasOwnPropertyFunctionCallDotNode::HasOwnPropertyFunctionCallDotNode):
        (JSC::AssignDotNode::AssignDotNode):
        (JSC::ReadModifyDotNode::ReadModifyDotNode):
        * parser/Nodes.cpp:
        (JSC::PropertyListNode::shouldCreateLexicalScopeForClass):
        * parser/Nodes.h:
        (JSC::ExpressionNode::isPrivateLocation const):
        (JSC::BaseDotNode::base const):
        (JSC::BaseDotNode::identifier const):
        (JSC::BaseDotNode::type const):
        (JSC::BaseDotNode::isPrivateField const):
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseVariableDeclarationList):
        (JSC::Parser<LexerType>::parseDestructuringPattern):
        (JSC::Parser<LexerType>::parseClass):
        (JSC::Parser<LexerType>::parseInstanceFieldInitializerSourceElements):
        (JSC::Parser<LexerType>::usePrivateName):
        (JSC::Parser<LexerType>::parseMemberExpression):
        (JSC::Parser<LexerType>::parseUnaryExpression):
        (JSC::Parser<LexerType>::printUnexpectedTokenText):
        * parser/Parser.h:
        (JSC::Scope::isPrivateNameScope const):
        (JSC::Scope::setIsPrivateNameScope):
        (JSC::Scope::hasPrivateName):
        (JSC::Scope::copyUndeclaredPrivateNamesTo):
        (JSC::Scope::hasUsedButUndeclaredPrivateNames const):
        (JSC::Scope::usePrivateName):
        (JSC::Scope::declarePrivateName):
        (JSC::Parser::findPrivateNameScope):
        (JSC::Parser::privateNameScope):
        (JSC::Parser::copyUndeclaredPrivateNamesToOuterScope):
        (JSC::Parser::matchAndUpdate):
        (JSC::Parser<LexerType>::parse):
        (JSC::parse):
        * parser/ParserTokens.h:
        * parser/SyntaxChecker.h:
        (JSC::SyntaxChecker::createDotAccess):
        (JSC::SyntaxChecker::operatorStackPop):
        * parser/VariableEnvironment.cpp:
        (JSC::VariableEnvironment::operator=):
        (JSC::VariableEnvironment::swap):
        (JSC::CompactVariableEnvironment::CompactVariableEnvironment):
        * parser/VariableEnvironment.h:
        (JSC::VariableEnvironmentEntry::isPrivateName const):
        (JSC::VariableEnvironmentEntry::setIsPrivateName):
        (JSC::PrivateNameEntry::PrivateNameEntry):
        (JSC::PrivateNameEntry::isUsed const):
        (JSC::PrivateNameEntry::isDeclared const):
        (JSC::PrivateNameEntry::setIsUsed):
        (JSC::PrivateNameEntry::setIsDeclared):
        (JSC::PrivateNameEntry::bits const):
        (JSC::PrivateNameEntry::operator== const):
        (JSC::VariableEnvironment::VariableEnvironment):
        (JSC::VariableEnvironment::size const):
        (JSC::VariableEnvironment::mapSize const):
        (JSC::VariableEnvironment::declarePrivateName):
        (JSC::VariableEnvironment::usePrivateName):
        (JSC::VariableEnvironment::privateNames const):
        (JSC::VariableEnvironment::privateNamesSize const):
        (JSC::VariableEnvironment::hasPrivateName):
        (JSC::VariableEnvironment::copyPrivateNamesTo const):
        (JSC::VariableEnvironment::copyUndeclaredPrivateNamesTo const):
        (JSC::VariableEnvironment::RareData::RareData):
        (JSC::VariableEnvironment::getOrAddPrivateName):
        * runtime/CachedTypes.cpp:
        (JSC::CachedOptional::decodeAsPtr const):
        (JSC::CachedVariableEnvironmentRareData::encode):
        (JSC::CachedVariableEnvironmentRareData::decode const):
        (JSC::CachedVariableEnvironment::encode):
        (JSC::CachedVariableEnvironment::decode const):
        (JSC::CachedSymbolTableRareData::encode):
        (JSC::CachedSymbolTableRareData::decode const):
        (JSC::CachedSymbolTable::encode):
        (JSC::CachedSymbolTable::decode const):
        * runtime/CodeCache.cpp:
        (JSC::generateUnlinkedCodeBlockImpl):
        * runtime/CommonIdentifiers.cpp:
        (JSC::CommonIdentifiers::CommonIdentifiers):
        * runtime/CommonIdentifiers.h:
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/CommonSlowPaths.h:
        * runtime/ExceptionHelpers.cpp:
        (JSC::createInvalidPrivateNameError):
        (JSC::createRedefinedPrivateNameError):
        * runtime/ExceptionHelpers.h:
        * runtime/JSGlobalObject.cpp:
        (JSC::createPrivateSymbol):
        (JSC::JSGlobalObject::init):
        * runtime/JSObject.h:
        * runtime/JSObjectInlines.h:
        (JSC::JSObject::getPrivateFieldSlot):
        (JSC::JSObject::getPrivateField):
        (JSC::JSObject::putPrivateField):
        (JSC::JSObject::definePrivateField):
        * runtime/JSScope.cpp:
        (JSC::JSScope::collectClosureVariablesUnderTDZ):
        * runtime/OptionsList.h:
        * runtime/SymbolTable.cpp:
        (JSC::SymbolTable::cloneScopePart):
        * runtime/SymbolTable.h:

2020-06-05  Paulo Matos  <pmatos@igalia.com>

        Fix includes to fix latest non-unified builds breakages
        https://bugs.webkit.org/show_bug.cgi?id=212802

        Reviewed by Adrian Perez de Castro.

        * dfg/DFGDoesGCCheck.cpp:
        * runtime/JSDateMath.h:

2020-06-04  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Report extra memory allocation from PropertyTable
        https://bugs.webkit.org/show_bug.cgi?id=212793

        Reviewed by Saam Barati.

        This patch adds extra memory reporting from PropertyTable to make GC
        responsive to the increase of memory in PropertyTable.

        * runtime/PropertyMapHashTable.h:
        (JSC::PropertyTable::add):
        (JSC::PropertyTable::remove):
        (JSC::PropertyTable::rehash):
        (JSC::PropertyTable::dataSize):
        * runtime/PropertyTable.cpp:
        (JSC::PropertyTable::finishCreation):
        (JSC::PropertyTable::visitChildren):
        * runtime/Structure.cpp:
        (JSC::Structure::materializePropertyTable):
        * runtime/StructureInlines.h:
        (JSC::Structure::add):
        (JSC::Structure::remove):

2020-06-04  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, reverting r262583.
        https://bugs.webkit.org/show_bug.cgi?id=212799

        Internal source code has the same bug, needs to be landed
        after fixing internal source

        Reverted changeset:

        "DOM constructor should only accept Ref<> / ExceptionOr<Ref<>>
        for creation to ensure toJSNewlyCreated is always returning
        object"
        https://bugs.webkit.org/show_bug.cgi?id=212767
        https://trac.webkit.org/changeset/262583

2020-06-04  Michael Saboff  <msaboff@apple.com>

        Add a Thread Specific Cache for LinkBuffer::CompactAndLinkCode()
        https://bugs.webkit.org/show_bug.cgi?id=212765

        Reviewed by Saam Barati.

        Added a thread local buffer for CPU types that use a second buffer when compacting.
        This is very similary to the work done in https://bugs.webkit.org/show_bug.cgi?id=212562.

        * assembler/LinkBuffer.cpp:
        (JSC::threadSpecificBranchCompactionLinkBuffer):
        (JSC::BranchCompactionLinkBuffer::BranchCompactionLinkBuffer):
        (JSC::BranchCompactionLinkBuffer::~BranchCompactionLinkBuffer):
        (JSC::BranchCompactionLinkBuffer::data):
        (JSC::BranchCompactionLinkBuffer::takeBufferIfLarger):
        (JSC::BranchCompactionLinkBuffer::size):
        (JSC::LinkBuffer::copyCompactAndLinkCode):

2020-06-04  Mark Lam  <mark.lam@apple.com>

        Add Options::validateDoesGC() for turning DoesGC validation on/off.
        https://bugs.webkit.org/show_bug.cgi?id=212773

        Reviewed by Saam Barati.

        It will default to on if ASSERT_ENABLED because we want testing to be done with
        the validation on.  When needed, we can turn it off if we need to e.g. to
        de-clutter disassembly dumps while debugging.

        If Options::validateDoesGC() is false, we turn off JIT code emission for this
        check, as well as skip the validation checks.  There are still places in C++
        code that store to DoesGC::m_value without checking Options::validateDoesGC().
        It doesn't hurt to just let these stores proceed, and performance-wise, it's
        probably cheaper to just do the store unconditionally than to gate it on a load of
        Options::validateDoesGC() first.

        Also made it explicit that the check on validateDFGDoesGC is a constexpr check.

        * dfg/DFGDoesGCCheck.cpp:
        (JSC::DFG::DoesGCCheck::verifyCanGC):
        * dfg/DFGOSRExit.cpp:
        (JSC::DFG::OSRExit::compileExit):
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileNode):
        * ftl/FTLOSRExitCompiler.cpp:
        (JSC::FTL::compileStub):
        * runtime/OptionsList.h:

2020-06-04  Ross Kirsling  <ross.kirsling@sony.com>

        Intl classes should have meaningful @@toStringTag values
        https://bugs.webkit.org/show_bug.cgi?id=212769

        Reviewed by Yusuke Suzuki.

        Implementation of https://github.com/tc39/ecma402/pull/430, which achieved consensus this week.
        This ensures we get "[object Intl.Collator]" (etc.) instead "[object Object]" for older Intl classes.

        * runtime/IntlCollatorPrototype.cpp:
        * runtime/IntlDateTimeFormatPrototype.cpp:
        * runtime/IntlNumberFormatPrototype.cpp:
        * runtime/IntlPluralRulesPrototype.cpp:

2020-06-04  Alexey Shvayka  <shvaikalesh@gmail.com>

        GetMethod isn't performed properly on iterators
        https://bugs.webkit.org/show_bug.cgi?id=212771

        Reviewed by Saam Barati.

        Before this change, iterator's "return" and "throw" methods with value of `null` were
        considered incorrect rather than missing, causing TypeError to be thrown.

        This patch aligns method lookup of iterators with the spec [1], V8, and SpiderMonkey
        by utilizing isUndefinedOrNull(), which doesn't special-case [[IsHTMLDDA]] objects [2],
        fixing a few Annex B tests.

        for/of microbenchmarks are neutral.

        [1]: https://tc39.es/ecma262/#sec-getmethod (step 3)
        [2]: https://tc39.es/ecma262/#sec-IsHTMLDDA-internal-slot

        * builtins/AsyncFromSyncIteratorPrototype.js:
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitIteratorGenericClose):
        (JSC::BytecodeGenerator::emitGetAsyncIterator):
        (JSC::BytecodeGenerator::emitDelegateYield):
        * runtime/IteratorOperations.cpp:
        (JSC::iteratorClose):
        * runtime/JSGenericTypedArrayViewConstructorInlines.h:
        (JSC::constructGenericTypedArrayViewWithArguments):

2020-06-04  Mark Lam  <mark.lam@apple.com>

        Reduce DFGDoesGCCheck to only storing a uint32_t.
        https://bugs.webkit.org/show_bug.cgi?id=212734

        Reviewed by Saam Barati and Caio Lima.

        This patch changes the encoding of DoesGCCheck so that it will fit better in a
        uint32_t.  This has the following benefits:
        1. speed improvement for debug builds because it now takes less instructions
           (especially in JITted code) to store to DoesGCCheck::m_value.
        2. enables this check for 32-bit platforms as well.

        Fun fact: we currently have 373 DFG::NodeTypes.  Hence, 9 bits for nodeOp.

        The new encoding provides 21 bis for the nodeIndex.  This gives us up to 2097152
        node indexes.  In my experience, I've never seen more than 3 decimal digits for
        the nodeIndex so far.  If we ever find that we need more than 21 bits of nodeIndex,
        we have 2 options to deal with it:

        1. We can just ignore the high bits.  After all, it is the nodeOp that is the
           most interesting piece of data we need to debug doesGC issues.

        2. We can make DoesGCCheck use uint64_t for storage.  This encoding automatically
           scales to 64-bit, while still allowing the more efficient form of storing a
           32-bit immediate to be used for the common cases.

        This patch also makes ENABLE_DFG_DOES_GC_VALIDATION dependent on ENABLE(DFG_JIT).
        DoesGC is only relevant for the DFG and FTL JITs.

        * dfg/DFGDoesGCCheck.cpp:
        (JSC::DFG::DoesGCCheck::verifyCanGC):
        * dfg/DFGDoesGCCheck.h:
        (JSC::DFG::DoesGCCheck::encode):
        (JSC::DFG::DoesGCCheck::expectDoesGC const):
        (JSC::DFG::DoesGCCheck::isSpecial const):
        (JSC::DFG::DoesGCCheck::special):
        (JSC::DFG::DoesGCCheck::nodeOp):
        (JSC::DFG::DoesGCCheck::nodeIndex):
        (JSC::DFG::DoesGCCheck::expectDoesGC): Deleted.
        (JSC::DFG::DoesGCCheck::isSpecial): Deleted.
        (JSC::DFG::DoesGCCheck::specialIndex): Deleted.
        (JSC::DFG::DoesGCCheck::bits): Deleted.
        * dfg/DFGNodeType.h:
        * dfg/DFGOSRExit.cpp:
        (JSC::DFG::OSRExit::compileExit):
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileNode):
        * ftl/FTLOSRExitCompiler.cpp:
        (JSC::FTL::compileStub):
        * heap/Heap.h:

2020-06-04  Tim Horton  <timothy_horton@apple.com>

        Work around broken system version macro
        https://bugs.webkit.org/show_bug.cgi?id=212726

        Reviewed by Dan Bernstein.

        * Configurations/DebugRelease.xcconfig:

2020-06-04  Andy Estes  <aestes@apple.com>

        [watchOS] Re-enable content filtering in the simulator build
        https://bugs.webkit.org/show_bug.cgi?id=212711
        <rdar://problem/63938350>

        Reviewed by Wenson Hsieh.

        * Configurations/FeatureDefines.xcconfig:

2020-06-04  Mark Lam  <mark.lam@apple.com>

        SpeculativeJIT::compileDateGet()'s slow path does not need an exception check.
        https://bugs.webkit.org/show_bug.cgi?id=212645

        Reviewed by Yusuke Suzuki.

        SpeculativeJIT::compileDateGet() implements a bunch of Date intrinsics which call
        into a C++ operation function do their work.  However, the call to these operation
        functions were done using a slow path generator configured to automatically
        emit exception checks after the call.  These exception checks are unneeded because
        those functions will not throw any exceptions.

        This issue was found with JSC stress test runs on a debug build.  The doesGC
        verifier was failing on the exceptionFuzz/date-format-xparb.js test.  The reason
        is because doesGC does not expect any these Date intrinsics to throw any exceptions,
        but SpeculativeJIT was emitting the unneeded exception checks there.  These
        exception check sites get turned into throw sites by the exceptionFuzzer, and
        they allocate an Error object there.  This allocation made the doesGC verifier
        not happy.

        This patch fixes this issue by changing SpeculativeJIT::compileDateGet() to
        pass ExceptionCheckRequirement::CheckNotNeeded to the slow path generator.

        The patch also proves that all the operation functions cannot throw any exceptions.
        Previously, the operations passes a VM& to the Date functions.  The purpose for
        doing this is so that the Date functions can work with a few date cache data
        structures stored as VM fields.

        This patch refactors those VM fields into a VM::DateCache struct, and changed all
        those Date functions to take a VM::DateCache& instead of a VM&.  Since the Date
        functions no longer take a VM&, this proves that they cannot throw because they
        would need a VM& to make a ThrowScope in order to throw.

        Update: Yusuke pointed out that the lack of a JSGlobalObject* argument is sufficient
        to guarantee that the Date functions cannot throw.  However, we'll keep this
        DateCache refactoring since it provides additional info that the Date functions
        only operate on the DateCache fields and nothing else in VM.

        Also removed DFG::JITCompile's fastExceptionCheck() which is unused.

        * dfg/DFGJITCompiler.h:
        (JSC::DFG::JITCompiler::fastExceptionCheck): Deleted.
        * dfg/DFGOperations.cpp:
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compileDateGet):
        * runtime/DateConstructor.cpp:
        (JSC::millisecondsFromComponents):
        (JSC::callDate):
        * runtime/DateInstance.cpp:
        (JSC::DateInstance::calculateGregorianDateTime const):
        (JSC::DateInstance::calculateGregorianDateTimeUTC const):
        * runtime/DateInstance.h:
        * runtime/DatePrototype.cpp:
        (JSC::formatLocaleDate):
        (JSC::formateDateInstance):
        (JSC::dateProtoFuncToISOString):
        (JSC::dateProtoFuncGetFullYear):
        (JSC::dateProtoFuncGetUTCFullYear):
        (JSC::dateProtoFuncGetMonth):
        (JSC::dateProtoFuncGetUTCMonth):
        (JSC::dateProtoFuncGetDate):
        (JSC::dateProtoFuncGetUTCDate):
        (JSC::dateProtoFuncGetDay):
        (JSC::dateProtoFuncGetUTCDay):
        (JSC::dateProtoFuncGetHours):
        (JSC::dateProtoFuncGetUTCHours):
        (JSC::dateProtoFuncGetMinutes):
        (JSC::dateProtoFuncGetUTCMinutes):
        (JSC::dateProtoFuncGetSeconds):
        (JSC::dateProtoFuncGetUTCSeconds):
        (JSC::dateProtoFuncGetTimezoneOffset):
        (JSC::setNewValueFromTimeArgs):
        (JSC::setNewValueFromDateArgs):
        (JSC::dateProtoFuncSetYear):
        (JSC::dateProtoFuncGetYear):
        * runtime/JSDateMath.cpp:
        (JSC::localTimeOffset):
        (JSC::gregorianDateTimeToMS):
        (JSC::msToGregorianDateTime):
        (JSC::parseDate):
        * runtime/JSDateMath.h:
        * runtime/VM.cpp:
        (JSC::VM::resetDateCache):
        * runtime/VM.h:

2020-06-04  Paulo Matos  <pmatos@igalia.com>

        Fix 32bit build broken at r262513
        https://bugs.webkit.org/show_bug.cgi?id=212735

        Unreviewed Gardening.

        Proper fix is being worked out under https://bugs.webkit.org/show_bug.cgi?id=212734

        * dfg/DFGOSRExit.cpp:
        (JSC::DFG::OSRExit::compileExit):

2020-06-03  Tadeu Zagallo  <tzagallo@apple.com>

        Disable B3 hoistLoopInvariantValues by default
        https://bugs.webkit.org/show_bug.cgi?id=212511
        <rdar://problem/63813245>

        Reviewed by Mark Lam.

        The hoistLoopInvariantValues optimization in B3 does not calculate the cost of hoisting the candidates.
        For example, in the test case provided with the bug, a switch inside a loop can lead to hoisting the body
        of several switch cases which would never be executed. Other than leading to worse runtime, this also
        increases the pressure in the register allocate, leading to worse compile times (~10x worse in this case).
        I have added a FIXME to consider adding cost calculation and re-enabling this pass, but given that we
        already have LICM in DFG, it should be ok to disable it for now.

        * b3/B3Generate.cpp:
        (JSC::B3::generateToAir):
        * runtime/OptionsList.h:

2020-06-03  Mark Lam  <mark.lam@apple.com>

        Gardening: fix broken Windows debug build.
        https://bugs.webkit.org/show_bug.cgi?id=212680

        Not reviewed.

        * dfg/DFGDoesGCCheck.cpp:
        (JSC::DFG::DoesGCCheck::verifyCanGC):
        * dfg/DFGDoesGCCheck.h:

2020-06-03  Mark Lam  <mark.lam@apple.com>

        [Re-landing] Enhance DoesGC verification to print more useful info when verification fails.
        https://bugs.webkit.org/show_bug.cgi?id=212680

        Reviewed by Yusuke Susuki.

        When DoesGC verification fails, the first step of debugging it would be to find
        out what and which DFG node resulted in the failed verification.  In pre-existing
        code, all we get is an assertion failure.

        This patch makes it so that the verifier will dump useful info.  Here's an example:

            Error: DoesGC failed @ D@34 DateGetInt32OrNaN in #DtCHMz:[0x1135bd1d0->0x1135bcab0->0x1135e5c80, DFGFunctionCall, 150 (DidTryToEnterInLoop)]
                [0] frame 0x7ffee8285660 {
                  name: 
                  sourceURL: 
                  isInlinedFrame: false
                  callee: 0x1135f6820
                  returnPC: 0x50ce61248ae6
                  callerFrame: 0x7ffee82856f0
                  rawLocationBits: 5 0x5
                  codeBlock: 0x1135bd1d0 #DtCHMz:[0x1135bd1d0->0x1135bcab0->0x1135e5c80, DFGFunctionCall, 150 (DidTryToEnterInLoop)]
                    hasCodeOrigins: true
                    callSiteIndex: 5 of 13
                    jitCode: 0x113020200 start 0x50ce61214c60 end 0x50ce61219b00
                    line: 1
                    column: 60
                  EntryFrame: 0x7ffee8285860
                }
                [1] frame 0x7ffee82856f0 {
                  name: 
                  sourceURL: date-format-xparb.js
                  isInlinedFrame: false
                  callee: 0x1135f65a0
                  returnPC: 0x50ce61227e99
                  callerFrame: 0x7ffee8285770
                  rawLocationBits: 4 0x4
                  codeBlock: 0x1135bd0a0 #BU6Zcd:[0x1135bd0a0->0x1135bc260->0x1135e5180, DFGFunctionCall, 112 (DidTryToEnterInLoop)]
                    hasCodeOrigins: true
                    callSiteIndex: 4 of 12
                    jitCode: 0x113004000 start 0x50ce61212c60 end 0x50ce61214960
                    line: 26
                    column: 22
                  EntryFrame: 0x7ffee8285860
                }
                [2] frame 0x7ffee8285770 {
                  name: 
                  sourceURL: date-format-xparb.js
                  isInlinedFrame: false
                  callee: 0x1135f64e0
                  returnPC: 0x108058eb1
                  callerFrame: 0x7ffee82857e0
                  rawLocationBits: 1001 0x3e9
                  codeBlock: 0x1135bc130 #DAS9xe:[0x1135bc130->0x1135e5100, BaselineFunctionCall, 1149]
                    bc#1001 of 1149
                    line: 417
                    column: 38
                  EntryFrame: 0x7ffee8285860
                }
                [3] frame 0x7ffee82857e0 {
                  name: global code
                  sourceURL: date-format-xparb.js
                  isInlinedFrame: false
                  callee: 0x1130f97b8
                  returnPC: 0x108039043
                  callerFrame: 0x0
                  rawLocationBits: 23 0x17
                  codeBlock: 0x1135bc000 <global>#CukXvt:[0x1135bc000->0x1130cd768, LLIntGlobal, 81]
                    bc#23 of 81
                    line: 425
                    column: 3
                  EntryFrame: 0x7ffee8285860
                }

            ASSERTION FAILED: expectDoesGC()

        The error message now comes with the node index, NodeType, codeBlock which this
        failure was found in, and the JS call stack that led to the failure.

        Changes made:

        1. Introduced a DoesGCCheck value that is used to encode some of the above data.

           Previously, we only recorded whether doesGC() returns true or false for the
           Node.  Now, we record the nodeIndex and nodeOp as well.

           Note that we also set DoesGC expectations for OSR exits.  So, DoesGCCheck
           includes Special cases for those.

        2. Added store64(TrustedImm64 imm, const void* address) emitters for X86_64 and ARM64.
           Also added a test for this new emitter in testmasm.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * Sources.txt:
        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::store64):
        * assembler/MacroAssemblerX86_64.h:
        (JSC::MacroAssemblerX86_64::store64):
        * assembler/testmasm.cpp:
        (JSC::testStore64Imm64AddressPointer):
        (JSC::run):
        * dfg/DFGDoesGCCheck.cpp: Copied from Source/JavaScriptCore/dfg/DFGDoesGCCheck.cpp.
        * dfg/DFGDoesGCCheck.h: Copied from Source/JavaScriptCore/dfg/DFGDoesGCCheck.h.
        * dfg/DFGGraph.cpp:
        * dfg/DFGOSRExit.cpp:
        (JSC::DFG::operationCompileOSRExit):
        (JSC::DFG::OSRExit::compileExit):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileNode):
        * ftl/FTLOSRExitCompiler.cpp:
        (JSC::FTL::compileStub):
        (JSC::FTL::operationCompileFTLOSRExit):
        * heap/CompleteSubspace.cpp:
        (JSC::CompleteSubspace::tryAllocateSlow):
        (JSC::CompleteSubspace::reallocatePreciseAllocationNonVirtual):
        * heap/CompleteSubspaceInlines.h:
        (JSC::CompleteSubspace::allocateNonVirtual):
        * heap/DeferGC.h:
        (JSC::DeferGC::~DeferGC):
        * heap/GCDeferralContextInlines.h:
        (JSC::GCDeferralContext::~GCDeferralContext):
        * heap/Heap.cpp:
        (JSC::Heap::collectNow):
        (JSC::Heap::collectAsync):
        (JSC::Heap::collectSync):
        (JSC::Heap::stopIfNecessarySlow):
        (JSC::Heap::collectIfNecessaryOrDefer):
        * heap/Heap.h:
        (JSC::Heap::addressOfDoesGC):
        (JSC::Heap::setDoesGCExpectation):
        (JSC::Heap::verifyCanGC):
        (JSC::Heap::expectDoesGC const): Deleted.
        (JSC::Heap::setExpectDoesGC): Deleted.
        (JSC::Heap::addressOfExpectDoesGC): Deleted.
        * heap/HeapInlines.h:
        (JSC::Heap::acquireAccess):
        (JSC::Heap::stopIfNecessary):
        * heap/LocalAllocatorInlines.h:
        (JSC::LocalAllocator::allocate):
        * heap/PreciseAllocation.cpp:
        (JSC::PreciseAllocation::tryCreate):
        (JSC::PreciseAllocation::createForLowerTier):
        * runtime/JSString.h:
        (JSC::jsSingleCharacterString):
        (JSC::JSString::toAtomString const):
        (JSC::JSString::toExistingAtomString const):
        (JSC::JSString::value const):
        (JSC::JSString::tryGetValue const):
        (JSC::JSRopeString::unsafeView const):
        (JSC::JSRopeString::viewWithUnderlyingString const):
        (JSC::JSString::unsafeView const):
        * runtime/RegExpMatchesArray.h:
        (JSC::createRegExpMatchesArray):

2020-06-03  Mark Lam  <mark.lam@apple.com>

        DFGSSAConversionPhase.cpp needs to #include OperandsInlines.h.
        https://bugs.webkit.org/show_bug.cgi?id=212687

        Reviewed by Keith Miller.

        Without this, strange build failures can happen with unified builds.

        For example, the Windows build started failing due a linkage error in this file
        when the patch from https://bugs.webkit.org/show_bug.cgi?id=212680 landed.
        212680 introduced a new .cpp file, and that probably bumped DFGSSAConversionPhase.cpp
        into another unified unit, thereby depriving it from seeing the OperandsInlines.h
        #include'd by another .cpp.

        * dfg/DFGSSAConversionPhase.cpp:

2020-06-03  Mark Lam  <mark.lam@apple.com>

        Fix non-unified --jsc-only build.
        https://bugs.webkit.org/show_bug.cgi?id=212707

        Reviewed by Yusuke Suzuki.

        These files need JSGlobalObjectInlines.h.  But rather than adding yet another
        #include, we'll just remove many individual ones and just #include JSCInlines.h
        instead.

        * wasm/js/JSToWasmICCallee.cpp:
        * wasm/js/WebAssemblyCompileErrorConstructor.cpp:
        * wasm/js/WebAssemblyCompileErrorPrototype.cpp:
        * wasm/js/WebAssemblyGlobalPrototype.cpp:
        * wasm/js/WebAssemblyInstanceConstructor.cpp:
        * wasm/js/WebAssemblyInstancePrototype.cpp:
        * wasm/js/WebAssemblyLinkErrorConstructor.cpp:
        * wasm/js/WebAssemblyLinkErrorPrototype.cpp:
        * wasm/js/WebAssemblyModulePrototype.cpp:
        * wasm/js/WebAssemblyRuntimeErrorConstructor.cpp:
        * wasm/js/WebAssemblyRuntimeErrorPrototype.cpp:

2020-06-03  Rob Buis  <rbuis@igalia.com>

        Make generated C++ code use modern C++
        https://bugs.webkit.org/show_bug.cgi?id=190714

        Reviewed by Jonathan Bedard.

        Update inspector protocol generator and rebaseline the tests.

        * inspector/scripts/codegen/cpp_generator_templates.py:
        * inspector/scripts/codegen/generate_cpp_protocol_types_header.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/same-type-id-different-domain.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:
        * yarr/generateYarrUnicodePropertyTables.py:

2020-06-02  Mark Lam  <mark.lam@apple.com>

        Rolling out r262475 to unbreak Windows bot.
        https://bugs.webkit.org/show_bug.cgi?id=212680

        Not reviewed.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * Sources.txt:
        * assembler/MacroAssemblerARM64.h:
        * assembler/MacroAssemblerX86_64.h:
        * assembler/testmasm.cpp:
        (JSC::testCountTrailingZeros64WithoutNullCheck):
        (JSC::run):
        (JSC::testStore64Imm64AddressPointer): Deleted.
        * dfg/DFGDoesGCCheck.cpp: Removed.
        * dfg/DFGDoesGCCheck.h: Removed.
        * dfg/DFGGraph.cpp:
        * dfg/DFGOSRExit.cpp:
        (JSC::DFG::operationCompileOSRExit):
        (JSC::DFG::OSRExit::compileExit):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileNode):
        * ftl/FTLOSRExitCompiler.cpp:
        (JSC::FTL::compileStub):
        (JSC::FTL::operationCompileFTLOSRExit):
        * heap/CompleteSubspace.cpp:
        (JSC::CompleteSubspace::tryAllocateSlow):
        (JSC::CompleteSubspace::reallocatePreciseAllocationNonVirtual):
        * heap/CompleteSubspaceInlines.h:
        (JSC::CompleteSubspace::allocateNonVirtual):
        * heap/DeferGC.h:
        (JSC::DeferGC::~DeferGC):
        * heap/GCDeferralContextInlines.h:
        (JSC::GCDeferralContext::~GCDeferralContext):
        * heap/Heap.cpp:
        (JSC::Heap::collectNow):
        (JSC::Heap::collectAsync):
        (JSC::Heap::collectSync):
        (JSC::Heap::stopIfNecessarySlow):
        (JSC::Heap::collectIfNecessaryOrDefer):
        * heap/Heap.h:
        (JSC::Heap::expectDoesGC const):
        (JSC::Heap::setExpectDoesGC):
        (JSC::Heap::addressOfExpectDoesGC):
        (JSC::Heap::addressOfDoesGC): Deleted.
        (JSC::Heap::setDoesGCExpectation): Deleted.
        (JSC::Heap::verifyCanGC): Deleted.
        * heap/HeapInlines.h:
        (JSC::Heap::acquireAccess):
        (JSC::Heap::stopIfNecessary):
        * heap/LocalAllocatorInlines.h:
        (JSC::LocalAllocator::allocate):
        * heap/PreciseAllocation.cpp:
        (JSC::PreciseAllocation::tryCreate):
        (JSC::PreciseAllocation::createForLowerTier):
        * runtime/JSString.h:
        (JSC::jsSingleCharacterString):
        (JSC::JSString::toAtomString const):
        (JSC::JSString::toExistingAtomString const):
        (JSC::JSString::value const):
        (JSC::JSString::tryGetValue const):
        (JSC::JSRopeString::unsafeView const):
        (JSC::JSRopeString::viewWithUnderlyingString const):
        (JSC::JSString::unsafeView const):
        * runtime/RegExpMatchesArray.h:
        (JSC::createRegExpMatchesArray):

2020-06-02  Mark Lam  <mark.lam@apple.com>

        Enhance DoesGC verification to print more useful info when verification fails.
        https://bugs.webkit.org/show_bug.cgi?id=212680

        Reviewed by Yusuke Suzuki.

        When DoesGC verification fails, the first step of debugging it would be to find
        out what and which DFG node resulted in the failed verification.  In pre-existing
        code, all we get is an assertion failure.

        This patch makes it so that the verifier will dump useful info.  Here's an example:

            Error: DoesGC failed @ D@34 DateGetInt32OrNaN in #DtCHMz:[0x1135bd1d0->0x1135bcab0->0x1135e5c80, DFGFunctionCall, 150 (DidTryToEnterInLoop)]
                [0] frame 0x7ffee8285660 {
                  name: 
                  sourceURL: 
                  isInlinedFrame: false
                  callee: 0x1135f6820
                  returnPC: 0x50ce61248ae6
                  callerFrame: 0x7ffee82856f0
                  rawLocationBits: 5 0x5
                  codeBlock: 0x1135bd1d0 #DtCHMz:[0x1135bd1d0->0x1135bcab0->0x1135e5c80, DFGFunctionCall, 150 (DidTryToEnterInLoop)]
                    hasCodeOrigins: true
                    callSiteIndex: 5 of 13
                    jitCode: 0x113020200 start 0x50ce61214c60 end 0x50ce61219b00
                    line: 1
                    column: 60
                  EntryFrame: 0x7ffee8285860
                }
                [1] frame 0x7ffee82856f0 {
                  name: 
                  sourceURL: date-format-xparb.js
                  isInlinedFrame: false
                  callee: 0x1135f65a0
                  returnPC: 0x50ce61227e99
                  callerFrame: 0x7ffee8285770
                  rawLocationBits: 4 0x4
                  codeBlock: 0x1135bd0a0 #BU6Zcd:[0x1135bd0a0->0x1135bc260->0x1135e5180, DFGFunctionCall, 112 (DidTryToEnterInLoop)]
                    hasCodeOrigins: true
                    callSiteIndex: 4 of 12
                    jitCode: 0x113004000 start 0x50ce61212c60 end 0x50ce61214960
                    line: 26
                    column: 22
                  EntryFrame: 0x7ffee8285860
                }
                [2] frame 0x7ffee8285770 {
                  name: 
                  sourceURL: date-format-xparb.js
                  isInlinedFrame: false
                  callee: 0x1135f64e0
                  returnPC: 0x108058eb1
                  callerFrame: 0x7ffee82857e0
                  rawLocationBits: 1001 0x3e9
                  codeBlock: 0x1135bc130 #DAS9xe:[0x1135bc130->0x1135e5100, BaselineFunctionCall, 1149]
                    bc#1001 of 1149
                    line: 417
                    column: 38
                  EntryFrame: 0x7ffee8285860
                }
                [3] frame 0x7ffee82857e0 {
                  name: global code
                  sourceURL: date-format-xparb.js
                  isInlinedFrame: false
                  callee: 0x1130f97b8
                  returnPC: 0x108039043
                  callerFrame: 0x0
                  rawLocationBits: 23 0x17
                  codeBlock: 0x1135bc000 <global>#CukXvt:[0x1135bc000->0x1130cd768, LLIntGlobal, 81]
                    bc#23 of 81
                    line: 425
                    column: 3
                  EntryFrame: 0x7ffee8285860
                }

            ASSERTION FAILED: expectDoesGC()

        The error message now comes with the node index, NodeType, codeBlock which this
        failure was found in, and the JS call stack that led to the failure.

        Changes made:

        1. Introduced a DoesGCCheck value that is used to encode some of the above data.

           Previously, we only recorded whether doesGC() returns true or false for the
           Node.  Now, we record the nodeIndex and nodeOp as well.

           Note that we also set DoesGC expectations for OSR exits.  So, DoesGCCheck
           includes Special cases for those.

        2. Added store64(TrustedImm64 imm, const void* address) emitters for X86_64 and ARM64.
           Also added a test for this new emitter in testmasm.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * Sources.txt:
        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::store64):
        * assembler/MacroAssemblerX86_64.h:
        (JSC::MacroAssemblerX86_64::store64):
        * assembler/testmasm.cpp:
        (JSC::testStore64Imm64AddressPointer):
        (JSC::run):
        * dfg/DFGDoesGCCheck.cpp: Added.
        (JSC::DFG::DoesGCCheck::verifyCanGC):
        * dfg/DFGDoesGCCheck.h: Added.
        (JSC::DFG::DoesGCCheck::DoesGCCheck):
        (JSC::DFG::DoesGCCheck::encode):
        (JSC::DFG::DoesGCCheck::set):
        (JSC::DFG::DoesGCCheck::expectDoesGC):
        (JSC::DFG::DoesGCCheck::special):
        (JSC::DFG::DoesGCCheck::nodeIndex):
        (JSC::DFG::DoesGCCheck::nodeOp):
        (JSC::DFG::DoesGCCheck::isSpecial):
        (JSC::DFG::DoesGCCheck::specialIndex):
        (JSC::DFG::DoesGCCheck::bits):
        * dfg/DFGGraph.cpp:
        * dfg/DFGOSRExit.cpp:
        (JSC::DFG::operationCompileOSRExit):
        (JSC::DFG::OSRExit::compileExit):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileNode):
        * ftl/FTLOSRExitCompiler.cpp:
        (JSC::FTL::compileStub):
        (JSC::FTL::operationCompileFTLOSRExit):
        * heap/CompleteSubspace.cpp:
        (JSC::CompleteSubspace::tryAllocateSlow):
        (JSC::CompleteSubspace::reallocatePreciseAllocationNonVirtual):
        * heap/CompleteSubspaceInlines.h:
        (JSC::CompleteSubspace::allocateNonVirtual):
        * heap/DeferGC.h:
        (JSC::DeferGC::~DeferGC):
        * heap/GCDeferralContextInlines.h:
        (JSC::GCDeferralContext::~GCDeferralContext):
        * heap/Heap.cpp:
        (JSC::Heap::collectNow):
        (JSC::Heap::collectAsync):
        (JSC::Heap::collectSync):
        (JSC::Heap::stopIfNecessarySlow):
        (JSC::Heap::collectIfNecessaryOrDefer):
        * heap/Heap.h:
        (JSC::Heap::addressOfDoesGC):
        (JSC::Heap::setDoesGCExpectation):
        (JSC::Heap::verifyCanGC):
        (JSC::Heap::expectDoesGC const): Deleted.
        (JSC::Heap::setExpectDoesGC): Deleted.
        (JSC::Heap::addressOfExpectDoesGC): Deleted.
        * heap/HeapInlines.h:
        (JSC::Heap::acquireAccess):
        (JSC::Heap::stopIfNecessary):
        * heap/LocalAllocatorInlines.h:
        (JSC::LocalAllocator::allocate):
        * heap/PreciseAllocation.cpp:
        (JSC::PreciseAllocation::tryCreate):
        (JSC::PreciseAllocation::createForLowerTier):
        * runtime/JSString.h:
        (JSC::jsSingleCharacterString):
        (JSC::JSString::toAtomString const):
        (JSC::JSString::toExistingAtomString const):
        (JSC::JSString::value const):
        (JSC::JSString::tryGetValue const):
        (JSC::JSRopeString::unsafeView const):
        (JSC::JSRopeString::viewWithUnderlyingString const):
        (JSC::JSString::unsafeView const):
        * runtime/RegExpMatchesArray.h:
        (JSC::createRegExpMatchesArray):

2020-06-02  Mark Lam  <mark.lam@apple.com>

        VMInspector APIs should be taking a VM* instead of a JSGlobalObject*.
        https://bugs.webkit.org/show_bug.cgi?id=212676

        Reviewed by Saam Barati and Robin Morisset.

        This because:
        1. None of the functions currently taking a JSGlobalObject* actually need the
           globalObject.  All of them need the VM.
        2. The role of the VMInspector is to enable inspection of the VM.  By requiring
           that it be passed a JSGlobalObject*, we were actually preventing the VMInspector
           from being used in code that have a VM to inspect but don't have a JSGlobalObject
           to use.

        The reason I'm choosing to pass VM* instead of VM& is because it makes these
        functions trivial to call using lldb interactively.  The VMInspector functions
        are also intentionally designed so that they can be used for this purpose.
        On occasion, I may have to cast literal numbers (addresses) to VM*.  Technically,
        I could cast a number to VM* and dereference it to get a VM& too.  However, at
        present, lldb is often buggy and not always reliable with casts.  I would like to
        lessen the chance that lldb fails on me when I'm deep in the middle of a debugging
        session, and have a need to call one of these functions.

        * tools/JSDollarVM.cpp:
        (JSC::functionGC):
        (JSC::functionEdenGC):
        (JSC::functionCodeBlockForFrame):
        (JSC::codeBlockFromArg):
        (JSC::functionDumpCallFrame):
        (JSC::functionDumpStack):
        * tools/VMInspector.cpp:
        (JSC::VMInspector::currentThreadOwnsJSLock):
        (JSC::ensureCurrentThreadOwnsJSLock):
        (JSC::VMInspector::gc):
        (JSC::VMInspector::edenGC):
        (JSC::VMInspector::isValidCodeBlock):
        (JSC::VMInspector::codeBlockForFrame):
        (JSC::VMInspector::dumpCallFrame):
        (JSC::VMInspector::dumpStack):
        * tools/VMInspector.h:

2020-06-02  Keith Rollin  <krollin@apple.com>

        Revert FEATURES_DEFINES related changes
        https://bugs.webkit.org/show_bug.cgi?id=212664
        <rdar://problem/63893033>

        Reviewed by Andy Estes.

        Bug 262310, Bug 262311, Bug 262318, and Bug 262331 involve changes to
        FEATURE_DEFINES and how the values there relate to those found in the
        Platform*.h files. Those changes break XCBuild (by removing the
        .xcfilelist related to UnifiedSources and the process for generating
        them), and so are being reverted.

        * Configurations/FeatureDefines.xcconfig:

2020-06-02  Ryan Haddad  <ryanhaddad@apple.com>

        Unreviewed, reverting r262424.

        Caused webkitpy test failure

        Reverted changeset:

        "Make generated C++ code use modern C++"
        https://bugs.webkit.org/show_bug.cgi?id=190714
        https://trac.webkit.org/changeset/262424

2020-06-02  Mark Lam  <mark.lam@apple.com>

        Change Gigacage::Config to use storage in WebConfig::g_config instead of its own.
        https://bugs.webkit.org/show_bug.cgi?id=212585
        <rdar://problem/63812487>

        Reviewed by Yusuke Suzuki.

        * assembler/testmasm.cpp:
        (JSC::testCagePreservesPACFailureBit):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::cageTypedArrayStorage):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::caged):
        * jit/AssemblyHelpers.h:
        (JSC::AssemblyHelpers::cageConditionally):
        * llint/LowLevelInterpreter64.asm:
        * runtime/JSCConfig.h:
        (JSC::Config::isPermanentlyFrozen):

2020-06-02  Saam Barati  <sbarati@apple.com>

        MultiDeleteByOffset should not always def
        https://bugs.webkit.org/show_bug.cgi?id=212621
        <rdar://problem/63824182>

        Reviewed by Yusuke Suzuki.

        Clobberize used to claim that MultiDeleteByOffset always defd a value.
        That's an incorrect modeling of MultiDeleteByOffset though, since it might
        have delete misses in its variant list. This would lead us to incorrectly
        CSE when we shouldn't. This patch fixes this by saying MultiDeleteByOffset
        only defs when all its cases write out a value (are hits).

        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGNode.cpp:
        (JSC::DFG::MultiDeleteByOffsetData::allVariantsStoreEmpty const):
        * dfg/DFGNode.h:
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileMultiDeleteByOffset):

2020-06-02  Rob Buis  <rbuis@igalia.com>

        Make generated C++ code use modern C++
        https://bugs.webkit.org/show_bug.cgi?id=190714

        Reviewed by Sam Weinig.

        Update inspector protocol generator and rebaseline the tests.

        * inspector/scripts/codegen/cpp_generator_templates.py:
        * inspector/scripts/codegen/generate_cpp_protocol_types_header.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/same-type-id-different-domain.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:
        * yarr/generateYarrUnicodePropertyTables.py:

2020-06-02  Paulo Matos  <pmatos@igalia.com>

        Fix assert message formatting
        https://bugs.webkit.org/show_bug.cgi?id=212591

        Reviewed by Adrian Perez de Castro.

        Fixes warning by gcc - lineParts.size() is size_t, %zu should be used.

        * runtime/FuzzerPredictions.cpp:
        (JSC::FuzzerPredictions::FuzzerPredictions):

2020-06-01  Devin Rousso  <drousso@apple.com>

        Web Inspector: Graphics: should use the `id` (name) of the animation if it exists
        https://bugs.webkit.org/show_bug.cgi?id=212618

        Reviewed by Timothy Hatcher.

        * inspector/protocol/Animation.json:
         - added an optional `name` property to the `Animation.Animation` type
         - created a new `Animation.nameChanged` event

2020-06-01  Saam Barati  <sbarati@apple.com>

        Correct misunderstandings on how ThreadSpecific work
        https://bugs.webkit.org/show_bug.cgi?id=212616

        Reviewed by Michael Saboff.

        There were two misunderstandings I had when writing code using ThreadSpecific
        when doing LLInt bytecode buffer caching in Wasm.
        
        1. For ThreadSpecific<Vector>, I was calling Vector's constructor twice
        unnecessarily, and incorrectly, since we ended up constructing over an
        already constructed Vector for the second call. When doing operator* or
        operator-> on a ThreadSpecific<T>, T() is called if it has not been
        initialized yet. So there is no need to do manually call the constructor
        the second time.
        
        2. There is no need to try to destroy entries for ThreadSpecific manually
        since we already run destructors when the thread goes away.
        
        This patch removes code for (1) and (2) both from the Wasm bytecode
        buffer and from AssemblerData.

        * assembler/AssemblerBuffer.cpp:
        (JSC::clearAssembleDataThreadSpecificCache): Deleted.
        * assembler/AssemblerBuffer.h:
        (JSC::AssemblerBuffer::AssemblerBuffer):
        (JSC::AssemblerBuffer::~AssemblerBuffer):
        (JSC::AssemblerBuffer::getThreadSpecificAssemblerData): Deleted.
        * dfg/DFGWorklist.cpp:
        * jit/JITWorklist.cpp:
        * wasm/WasmLLIntGenerator.cpp:
        (JSC::Wasm::LLIntGenerator::LLIntGenerator):
        (JSC::Wasm::clearLLIntThreadSpecificCache): Deleted.
        * wasm/WasmLLIntGenerator.h:
        * wasm/WasmWorklist.cpp:

2020-06-01  Yusuke Suzuki  <ysuzuki@apple.com>

        Unreviewed, fix build failure in ARMv7k
        https://bugs.webkit.org/show_bug.cgi?id=212595

        * runtime/JSCJSValue.cpp:
        (JSC::JSValue::toThisSlowCase const):

2020-06-01  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] JSBigInt::rightTrim can miss |this| pointer and leads to incorrect GC collection
        https://bugs.webkit.org/show_bug.cgi?id=212601

        Reviewed by Saam Barati.

        This is pretty rare case. But in some optimization level, JSBigInt::rightTrim could store |this| + offset pointer into the stack instead of |this|
        and make conservative GC think that |this| JSBigInt is unreachable. We put ensureStillAliveHere(this) to ensure that this is alive.

        * runtime/JSBigInt.cpp:
        (JSC::JSBigInt::rightTrim):

2020-06-01  Mark Lam  <mark.lam@apple.com>

        x86.rb's LabelReference.x86LoadOperand()'s address operand should be a pointer type.
        https://bugs.webkit.org/show_bug.cgi?id=212603

        Reviewed by Saam Barati.

        The current implementation mistakenly sets the address type to that of the value
        being loaded.  I encountered this issue when I was trying to do a loadb from a
        global address.  Because of this bug, the emitted code was trying do a load using
        %al (8 byte register) as the pointer to load from.  With this fix, it now loads
        from %rax.

        * offlineasm/x86.rb:

2020-06-01  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] JSValue::toThis should not throw exception
        https://bugs.webkit.org/show_bug.cgi?id=212595

        Reviewed by Mark Lam.

        Including WebCore code, there are a lot of code which assume JSValue::toThis should not throw an exception.
        This assumption was now broken after making JSBigInt allocation graceful for OOM. But for this particular JSValue::toThis case,
        we can make it non-throwing code.

        This patch makes JSValue::toThis non-throwing code to fix exception-missing debug assertions.
        We ensure that BigIntObject can hold BigInt32 (actually, it can already if toObjectSlowCase path is taken).

        * runtime/BigIntObject.cpp:
        (JSC::BigIntObject::create):
        * runtime/JSCJSValue.cpp:
        (JSC::JSValue::toThisSlowCase const):

2020-06-01  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] BigInt operations should handle exception correctly
        https://bugs.webkit.org/show_bug.cgi?id=212596

        Reviewed by Mark Lam.

        Some places miss exception check / explicit scope-release while BigInt operations can now throw an exception.
        This patch adds them. They are covered by existing stress tests with Debug build.

        * runtime/Operations.h:
        (JSC::compareBigIntToOtherPrimitive):
        (JSC::compareBigInt32ToOtherPrimitive):
        (JSC::jsInc):
        (JSC::jsDec):
        (JSC::jsBitwiseNot):

2020-05-31  Michael Saboff  <msaboff@apple.com>

        Consider a Thread Specific Cache for AssemblerBuffers
        https://bugs.webkit.org/show_bug.cgi?id=212562

        Reviewed by Filip Pizlo.

        This patch creates a thread local cache of AssemblerData in the hopes that it will reduce
        memory allocation churn.  The cache is cleared when a thread is destroyed.
        If an AssemblerData is destroyed in another thread, its storage is cached by the
        destroying thread.

        Made a few changes described below to facilite the swap as well as returning a
        clear()'ed AssemblerData back to its original state.

        Reviewed by Filip Pizlo.

        * assembler/AssemblerBuffer.cpp:
        (JSC::threadSpecificAssemblerData):
        (JSC::clearAssembleDataThreadSpecificCache):
        * assembler/AssemblerBuffer.h:

        (JSC::AssemblerData::AssemblerData):
        (JSC::AssemblerData::operator=):
        The copy constructor and assignment operator now perform complete AssemblerBuffer swaps.

        (JSC::AssemblerData::takeBufferIfLarger):
        A new method that will conditionally copy the enclosed buffer of the argument to "this"
        if the argument's buffer is larger than the current buffer of "this".

        (JSC::AssemblerData::~AssemblerData):
        (JSC::AssemblerData::clear):
        The destructor now calls clear which has been changed to reset the buffer to one with
        inline capacity.

        (JSC::AssemblerBuffer::AssemblerBuffer):
        Take the cached out of line buffer if there is one.

        (JSC::AssemblerBuffer::~AssemblerBuffer):
        Cache the enclosed out of line buffer if it is larger than the currently cached one.

        (JSC::AssemblerBuffer::getThreadSpecificAssemblerData):
        * dfg/DFGWorklist.cpp:
        * jit/JITWorklist.cpp:
        * wasm/WasmWorklist.cpp:

2020-05-31  Mark Lam  <mark.lam@apple.com>

        Change JSC::Config to use storage in WTF::Config instead of its own.
        https://bugs.webkit.org/show_bug.cgi?id=212575
        <rdar://problem/63796584>

        Reviewed by Yusuke Suzuki.

        Since Configs must be rounded up to CeilingOnPageSize, this will save us some
        memory since the contents of both Configs do not add up to CeilingOnPageSize.

        g_jscConfig is now located at g_wtfConfig.spaceForExtensions.

        * runtime/JSCConfig.cpp:
        (JSC::Config::disableFreezingForTesting):
        (JSC::Config::enableRestrictedOptions):
        (JSC::Config::permanentlyFreeze): Deleted.
        * runtime/JSCConfig.h:
        (JSC::Config::permanentlyFreeze):
        (JSC::Config::isPermanentlyFrozen):
        (): Deleted.
        * runtime/Options.cpp:
        (JSC::Options::setOptions):
        * tools/JSDollarVM.cpp:
        (JSC::functionCallWithStackSize):

2020-05-30  Mark Lam  <mark.lam@apple.com>

        Rename Signal::BadAccess to Signal::AccessFault.
        https://bugs.webkit.org/show_bug.cgi?id=212577

        Reviewed by Yusuke Suzuki.

        * runtime/VMTraps.cpp:
        * wasm/WasmFaultSignalHandler.cpp:
        (JSC::Wasm::enableFastMemory):

2020-05-30  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] for-in should allocate new temporary register for base
        https://bugs.webkit.org/show_bug.cgi?id=212519
        <rdar://problem/63722044>

        Reviewed by Saam Barati.

        While r262233 keeps for-in's enumerated object in variable register if possible to use this register for heuristics driving an optimization,
        for-in body can replace the content of this register during enumeration and confuse enumerator.

        Instead, we record Variable information in StructureForInContext. This allows us to detect patterns using heap-variables too.
        Further, this patch extends pattern-matching code to support ThisNode too.

        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::pushStructureForInScope):
        * bytecompiler/BytecodeGenerator.h:
        (JSC::Variable::Variable):
        (JSC::Variable::isResolved const):
        (JSC::Variable::symbolTableConstantIndex const):
        (JSC::Variable::ident const):
        (JSC::Variable::offset const):
        (JSC::Variable::isLocal const):
        (JSC::Variable::local const):
        (JSC::Variable::isReadOnly const):
        (JSC::Variable::isSpecial const):
        (JSC::Variable::isConst const):
        (JSC::Variable::setIsReadOnly):
        (JSC::Variable::operator== const):
        (JSC::StructureForInContext::StructureForInContext):
        (JSC::StructureForInContext::baseVariable const):
        (JSC::StructureForInContext::base const): Deleted.
        * bytecompiler/NodesCodegen.cpp:
        (JSC::HasOwnPropertyFunctionCallDotNode::emitBytecode):
        (JSC::ForInNode::emitBytecode):
        * parser/ASTBuilder.h:
        (JSC::ASTBuilder::makeFunctionCallNode):
        * parser/Nodes.h:
        (JSC::ExpressionNode::isThisNode const):

2020-05-30  Yusuke Suzuki  <ysuzuki@apple.com>

        Unreviewed, fix JSC debug tests' exception checking
        https://bugs.webkit.org/show_bug.cgi?id=212512

        * runtime/JSBigInt.cpp:
        (JSC::JSBigInt::createWithLength):
        (JSC::JSBigInt::allocateFor):

2020-05-30  Mark Lam  <mark.lam@apple.com>

        AssemblyHelpers::callExceptionFuzz() is passing a wrong argument to operationExceptionFuzz().
        https://bugs.webkit.org/show_bug.cgi?id=212561

        Reviewed by Yusuke Suzuki.

        There's 2 possible solution to this issue:
        1. Thread the globalObject from all the way up the clients calling into
           callExceptionFuzz(), or
        2. Introduce a operationExceptionFuzzWithCallFrame() wrapper take receives a VM*
           and CallFrame*, and use these to get the lexicalGlobalObject.

        This patch applies solution 2.

        Solution 1 is too unwieldy because it will cause the threading of the globalObject
        argument to fan out to many clients, and almost all of those clients currently
        do not need the globalObject.  Hence, implementing this solution may incur some
        performance penalty in normal code, for the sole benefit of this one fuzzing tool.

        Secondly, the exception fuzzer doesn't really care which globalObject is used.
        It only cares that an exception is thrown, and we need a globalObject in order to
        throw that exception.  Hence, there is no benefit to threading the globalObject
        down from all the clients.

        * jit/AssemblyHelpers.cpp:
        (JSC::AssemblyHelpers::callExceptionFuzz):
        * jit/JITOperations.cpp:
        * jit/JITOperations.h:

2020-05-29  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] JSBigInt allocation should be graceful for OOM
        https://bugs.webkit.org/show_bug.cgi?id=212512

        Reviewed by Mark Lam.

        This patch allows JSBigInt's storage allocation to fail gracefully if OOM condition happens.
        We thread JSGlobalObject* instead of VM& and throw OOM error if storage allocation failed.
        We also rename `JSGlobalObject* globalObject` parameter to `JSGlobalObject* nullOrGlobalObjectForOOM`
        if it can be nullptr.

        * jit/JITOperations.cpp:
        * jsc.cpp:
        (functionCreateHeapBigInt):
        * parser/ParserArena.cpp:
        (JSC::IdentifierArena::makeBigIntDecimalIdentifier):
        * runtime/BigIntConstructor.cpp:
        (JSC::toBigInt):
        (JSC::callBigIntConstructor):
        * runtime/BigIntPrototype.cpp:
        (JSC::toThisBigIntValue):
        (JSC::bigIntProtoFuncToString):
        (JSC::bigIntProtoFuncToLocaleString):
        (JSC::bigIntProtoFuncValueOf):
        * runtime/CachedTypes.cpp:
        (JSC::CachedBigInt::decode const):
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/IntlNumberFormatPrototype.cpp:
        (JSC::IntlNumberFormatFuncFormat):
        * runtime/JSBigInt.cpp:
        (JSC::JSBigInt::createZero):
        (JSC::JSBigInt::tryCreateZero):
        (JSC::JSBigInt::createWithLength):
        (JSC::JSBigInt::tryCreateWithLength):
        (JSC::JSBigInt::createFrom):
        (JSC::JSBigInt::tryCreateFrom):
        (JSC::JSBigInt::createFromImpl):
        (JSC::JSBigInt::parseInt):
        (JSC::HeapBigIntImpl::toHeapBigInt):
        (JSC::Int32BigIntImpl::toHeapBigInt):
        (JSC::zeroImpl):
        (JSC::JSBigInt::exponentiateImpl):
        (JSC::JSBigInt::multiplyImpl):
        (JSC::JSBigInt::divideImpl):
        (JSC::JSBigInt::copy):
        (JSC::JSBigInt::unaryMinusImpl):
        (JSC::JSBigInt::unaryMinus):
        (JSC::JSBigInt::remainderImpl):
        (JSC::JSBigInt::incImpl):
        (JSC::JSBigInt::decImpl):
        (JSC::JSBigInt::addImpl):
        (JSC::JSBigInt::subImpl):
        (JSC::JSBigInt::bitwiseAndImpl):
        (JSC::JSBigInt::bitwiseOrImpl):
        (JSC::JSBigInt::bitwiseXorImpl):
        (JSC::JSBigInt::absoluteAdd):
        (JSC::JSBigInt::absoluteSub):
        (JSC::JSBigInt::absoluteDivWithDigitDivisor):
        (JSC::JSBigInt::absoluteDivWithBigIntDivisor):
        (JSC::JSBigInt::absoluteLeftShiftAlwaysCopy):
        (JSC::JSBigInt::absoluteBitwiseOp):
        (JSC::JSBigInt::absoluteAnd):
        (JSC::JSBigInt::absoluteOr):
        (JSC::JSBigInt::absoluteAndNot):
        (JSC::JSBigInt::absoluteXor):
        (JSC::JSBigInt::absoluteAddOne):
        (JSC::JSBigInt::absoluteSubOne):
        (JSC::JSBigInt::leftShiftByAbsolute):
        (JSC::JSBigInt::rightShiftByAbsolute):
        (JSC::JSBigInt::rightShiftByMaximum):
        (JSC::JSBigInt::toStringBasePowerOfTwo):
        (JSC::JSBigInt::toStringGeneric):
        (JSC::JSBigInt::rightTrim):
        (JSC::JSBigInt::tryRightTrim):
        (JSC::JSBigInt::allocateFor):
        (JSC::JSBigInt::asIntNImpl):
        (JSC::JSBigInt::asUintNImpl):
        (JSC::JSBigInt::truncateToNBits):
        (JSC::JSBigInt::truncateAndSubFromPowerOfTwo):
        (JSC::JSBigInt::createWithLengthUnchecked): Deleted.
        * runtime/JSBigInt.h:
        * runtime/JSCJSValue.cpp:
        (JSC::JSValue::toThisSlowCase const):
        * runtime/VM.cpp:
        (JSC::VM::VM):

2020-05-29  Saam Barati  <sbarati@apple.com>

        We need to properly model heap ranges of Delete in DFG/B3
        https://bugs.webkit.org/show_bug.cgi?id=212538
        <rdar://problem/63670964>

        Reviewed by Filip Pizlo.

        We need to properly model the aliasing dependencies of an inlined delete 
        operation. 
        
        We had a bug in the B3 IR we generated from code like this for a delete
        followed by a property addition:
        ```
        const o = { y: 0 };
        delete o.y;
        o.z = 0;
        ```
        
        generated:
        
        ```
        note: bb#5 dominates bb#10, bb#10 dominates bb#15
        
        bb#5
        Void b@125 = Store($-562949953421312(b@282), b@112, offset = 16, ControlDependent|Writes:129, D@30)
        bb#10
        Void b@171 = Store($0(b@2), b@112, offset = 16, ControlDependent|Writes:129, D@37)
        bb#15
        Void b@217 = Store($-562949953421312(b@282), b@112, offset = 16, ControlDependent|Writes:130, D@44)
        ```
        
        Notice that "y" and "z" ended up at the same property offset.
        
        In the above program, B3 proves the pointer we're storing to is the same value
        in all three stores (b@112). However, because of how it does store forwarding,
        it determined it could eliminate b@217 because b@125 already stored the same
        value to the same pointer. It didn't know that b@171 was a write because its
        heap range is different than @217. Generally, when using two heap ranges, it's
        telling B3 that two pointers don't alias.
        ```
        @A, Heap_H
        @B, Heap_H
        ```
        In the above program, 
        - If @B reads H and @A writes H, then @B is dependent on @A.
        - If @B writes H, then @B is dependent on @A if @A reads or writes H.
        
        So for delete, we need to model the deletion of a property as actually
        writing to all named properties that may exist at that slot given a
        series of structure transitions. We model this by saying the PutStructure
        for an inlined delete, or MultiDeleteByOffset, writes to all named properties
        (which is a superset of all named properties that may exist at that slot
        through a series of transitions).

        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * ftl/FTLAbstractHeap.cpp:
        (JSC::FTL::IndexedAbstractHeap::dump):
        (JSC::FTL::NumberedAbstractHeap::dump):
        (JSC::FTL::AbsoluteAbstractHeap::dump):
        (JSC::FTL::IndexedAbstractHeap::dump const): Deleted.
        (JSC::FTL::NumberedAbstractHeap::dump const): Deleted.
        (JSC::FTL::AbsoluteAbstractHeap::dump const): Deleted.
        * ftl/FTLAbstractHeap.h:
        (JSC::FTL::IndexedAbstractHeap::atAnyIndex):
        (JSC::FTL::NumberedAbstractHeap::atAnyNumber):
        (JSC::FTL::AbsoluteAbstractHeap::atAnyAddress):
        (JSC::FTL::IndexedAbstractHeap::atAnyIndex const): Deleted.
        (JSC::FTL::NumberedAbstractHeap::atAnyNumber const): Deleted.
        (JSC::FTL::AbsoluteAbstractHeap::atAnyAddress const): Deleted.
        * ftl/FTLAbstractHeapRepository.cpp:
        (JSC::FTL::AbstractHeapRepository::AbstractHeapRepository):
        * ftl/FTLAbstractHeapRepository.h:
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compilePutStructure):
        (JSC::FTL::DFG::LowerDFGToB3::compileMultiDeleteByOffset):

2020-05-29  Andy Estes  <aestes@apple.com>

        [Apple Pay] Remove conditionals for ENABLE_APPLE_PAY_SESSION_V(3|4)
        https://bugs.webkit.org/show_bug.cgi?id=212541

        Reviewed by Darin Adler.

        APPLE_PAY_SESSION_V(3|4) is now enabled whenever APPLE_PAY itself is enabled.

        * Configurations/FeatureDefines.xcconfig:

2020-05-29  Darin Adler  <darin@apple.com>

        Remove things from FeatureDefines.xcconfig that are covered by PlatformEnableCocoa.h
        https://bugs.webkit.org/show_bug.cgi?id=212418

        Rubber-stamped by Simon Fraser.

        * Configurations/FeatureDefines.xcconfig: Add back ENABLE_CSS_CONIC_GRADIENTS, removed
        by accident.

2020-05-27  Darin Adler  <darin@apple.com>

        Remove things from FeatureDefines.xcconfig that are covered by PlatformEnableCocoa.h
        https://bugs.webkit.org/show_bug.cgi?id=212418

        Reviewed by Andy Estes.

        * Configurations/FeatureDefines.xcconfig: Removed 83 of the 119 things defined in
        this file. There are 36 more that are slightly more complex that we can remove
        carefully later.

2020-05-29  Darin Adler  <darin@apple.com>

        [Cocoa] Pass all defines from Platform.h to various scripts, not just the ones from .xcconfig
        https://bugs.webkit.org/show_bug.cgi?id=212451

        Reviewed by Sam Weinig.

        * DerivedSources.make: Run the preprocessor on Platform.h and parse the output into
        FEATURE_AND_PLATFORM_DEFINES. Use that and FEATURE_AND_PLATFORM_DEFINE_DEPENDENCIES
        whenever we need a list of defines. Also took out some Windows-specific stuff since
        this is now only used on Mac platforms. Use ":=" when calling $(shell) to make sure
        the same shell command is not invoked over and over again.

2020-05-29  Keith Rollin  <krollin@apple.com>

        Revert switch to XCBuild
        https://bugs.webkit.org/show_bug.cgi?id=212530
        <rdar://problem/63764632>

        Unreviewed build fix.

        Bug 209890 enabled the use of XCBuild by default. Since then, some
        build issues have shown up. While addressing them, temporarily turn
        off the use of XCBuild by default.

        * Configurations/JavaScriptCore.xcconfig:
        * JavaScriptCore.xcodeproj/project.pbxproj:

2020-05-29  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, reverting r262245.
        https://bugs.webkit.org/show_bug.cgi?id=212531

        "Caused WebCore's 'Check .xcfilelists' build phase to be ~100x
        slower"

        Reverted changeset:

        "[Cocoa] Pass all defines from Platform.h to various scripts,
        not just the ones from .xcconfig"
        https://bugs.webkit.org/show_bug.cgi?id=212451
        https://trac.webkit.org/changeset/262245

2020-05-29  Devin Rousso  <drousso@apple.com>

        Web Inspector: add ITML debuggable/target type
        https://bugs.webkit.org/show_bug.cgi?id=203300
        <rdar://problem/56545896>

        Reviewed by Joseph Pecoraro and Brian Burg.

        * API/JSContextPrivate.h:
        * API/JSContext.mm:
        (-[JSContext _setITMLDebuggableType]): Added.
        * runtime/JSGlobalObject.h:
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::setIsITML): Added.
        Create an SPI for marking a `JSContext` as an ITML context for Web Inspector.

        * runtime/JSGlobalObjectDebuggable.h:
        (isType):
        * inspector/remote/RemoteControllableTarget.h:
        * inspector/remote/RemoteInspectionTarget.h:
        * inspector/remote/RemoteInspectorConstants.h:

        * inspector/JSGlobalObjectInspectorController.cpp:
        (Inspector::JSGlobalObjectInspectorController::connectFrontend):
        Don't dispatch `Inspector.activateExtraDomains` unless we're a basic `JavaScript` debuggable.

        * inspector/remote/cocoa/RemoteInspectorCocoa.mm:
        (Inspector::RemoteInspector::listingForInspectionTarget const):

        * inspector/scripts/codegen/models.py:
        (validate_target_types):
        * inspector/scripts/codegen/objc_generator.py:
        (ObjCGenerator):
        * inspector/scripts/tests/expected/fail-on-command-targetTypes-value.json-error:
        * inspector/scripts/tests/expected/fail-on-domain-debuggableTypes-value.json-error:
        * inspector/scripts/tests/expected/fail-on-domain-targetTypes-value.json-error:
        * inspector/scripts/tests/expected/fail-on-event-targetTypes-value.json-error:

        * inspector/protocol/Audit.json:
        * inspector/protocol/CSS.json:
        * inspector/protocol/Console.json:
        * inspector/protocol/DOM.json:
        * inspector/protocol/DOMStorage.json:
        * inspector/protocol/Database.json:
        * inspector/protocol/Debugger.json:
        * inspector/protocol/Heap.json:
        * inspector/protocol/Inspector.json:
        * inspector/protocol/Network.json:
        * inspector/protocol/Page.json:
        * inspector/protocol/Runtime.json:
        * inspector/protocol/Security.json:
        Add support for `itml` debuggables and targets, marking non-ITML commands/events with `page`.

2020-05-29  Mark Lam  <mark.lam@apple.com>

        Add a check for errors when computing a utf string in jsc shell's runInteractive().
        https://bugs.webkit.org/show_bug.cgi?id=212526
        <rdar://problem/63757892>

        Reviewed by Michael Saboff.

        * jsc.cpp:
        (runInteractive):

2020-05-28  Devin Rousso  <drousso@apple.com>

        Web Inspector: add missing condition guards when generating objc protocol files
        https://bugs.webkit.org/show_bug.cgi?id=212494

        Reviewed by Timothy Hatcher.

        * inspector/scripts/codegen/generate_objc_backend_dispatcher_header.py:
        (ObjCBackendDispatcherHeaderGenerator._generate_objc_forward_declarations):
        * inspector/scripts/codegen/generate_objc_configuration_header.py:
        (ObjCConfigurationHeaderGenerator._generate_properties_for_domain):
        * inspector/scripts/codegen/generate_objc_configuration_implementation.py:
        (ObjCConfigurationImplementationGenerator._generate_configuration_implementation_for_domains):
        (ObjCConfigurationImplementationGenerator._generate_ivars):
        (ObjCConfigurationImplementationGenerator._generate_dealloc):
        (ObjCConfigurationImplementationGenerator._generate_event_dispatcher_getter_for_domain):
        (ObjCConfigurationImplementationGenerator._variable_name_prefix_for_domain): Deleted.
        * inspector/scripts/codegen/generate_objc_frontend_dispatcher_implementation.py:
        (ObjCFrontendDispatcherImplementationGenerator._generate_event_dispatcher_implementations):
        (ObjCFrontendDispatcherImplementationGenerator._generate_event):
        * inspector/scripts/codegen/generate_objc_header.py:
        (ObjCHeaderGenerator._generate_forward_declarations):
        (ObjCHeaderGenerator._generate_enums):
        (ObjCHeaderGenerator._generate_types):
        (ObjCHeaderGenerator._generate_command_protocols):
        (ObjCHeaderGenerator._generate_event_interfaces):
        (ObjCHeaderGenerator._generate_single_event_interface):
        * inspector/scripts/codegen/generate_objc_internal_header.py:
        (ObjCInternalHeaderGenerator._generate_event_dispatcher_private_interfaces):
        * inspector/scripts/codegen/generate_objc_protocol_type_conversions_header.py:
        (ObjCProtocolTypeConversionsHeaderGenerator._generate_enum_conversion_functions):
        * inspector/scripts/tests/definitions-with-mac-platform.json:
        * inspector/scripts/tests/expected/definitions-with-mac-platform.json-result:

2020-05-27  Keith Miller  <keith_miller@apple.com>

        for-of should check the iterable is a JSArray for FastArray in DFG iterator_open
        https://bugs.webkit.org/show_bug.cgi?id=212383

        Reviewed by Saam Barati.

        This patch fixes an issue where we didn't check that the iterable operand to
        iterator_open was a JSArray when lowering the FastArray only variant of the bytecode to the DFG.
        This meant we would OSR exit at the iterator_next's lowering then assertion failure in the
        checkpoint OSR exit helper. To make this work, this patch extends (and renames from CheckSubClass)
        CheckJSCast to use the same JSType information that we use for the jsCast function. In order to
        get the JSType range from a ClassInfo* the macro that autogenerates MethodTable now also fills
        a Optional<JSTypeRange> into the ClassInfo as well.

        Lastly, speculationFromClassInfo was misused by AI. This patch
        renames it to speculationFromClassInfoInheritance to better
        reflect how AI was using it. The only other user of
        speculationFromClassInfo was speculationFromStructure. Any case
        where speculationFromClassInfoInteritance would differ from what a
        Structure would tell you has been hoisted to
        speculationFromStructure.

        * assembler/testmasm.cpp:
        (JSC::testBranchIfType):
        (JSC::testBranchIfNotType):
        * bytecode/SpeculatedType.cpp:
        (JSC::speculationFromClassInfoInheritance):
        (JSC::speculationFromStructure):
        (JSC::speculationFromClassInfo): Deleted.
        * bytecode/SpeculatedType.h:
        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGAbstractValue.cpp:
        (JSC::DFG::AbstractValue::filterClassInfo):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::handleDOMJITGetter):
        (JSC::DFG::ByteCodeParser::parseBlock):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGConstantFoldingPhase.cpp:
        (JSC::DFG::ConstantFoldingPhase::foldConstants):
        * dfg/DFGDoesGC.cpp:
        (JSC::DFG::doesGC):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        (JSC::DFG::FixupPhase::attemptToMakeCallDOM):
        (JSC::DFG::FixupPhase::fixupCheckJSCast):
        (JSC::DFG::FixupPhase::fixupCheckSubClass): Deleted.
        * dfg/DFGNode.h:
        (JSC::DFG::Node::hasClassInfo const):
        * dfg/DFGNodeType.h:
        * dfg/DFGPredictionPropagationPhase.cpp:
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::checkArray):
        (JSC::DFG::SpeculativeJIT::compileCheckJSCast):
        (JSC::DFG::SpeculativeJIT::compileCheckSubClass): Deleted.
        * dfg/DFGSpeculativeJIT.h:
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileNode):
        (JSC::FTL::DFG::LowerDFGToB3::compileCheckJSCast):
        (JSC::FTL::DFG::LowerDFGToB3::isCellWithType):
        (JSC::FTL::DFG::LowerDFGToB3::isTypedArrayView):
        (JSC::FTL::DFG::LowerDFGToB3::compileCheckSubClass): Deleted.
        * jit/AssemblyHelpers.h:
        (JSC::AssemblyHelpers::branchIfType):
        (JSC::AssemblyHelpers::branchIfNotType):
        * runtime/ClassInfo.h:
        * runtime/JSCast.h:
        (JSC::JSTypeRange::contains const):
        (JSC::JSCastingHelpers::inheritsJSTypeImpl):
        * runtime/JSFunction.cpp:
        (JSC::JSFunction::assertTypeInfoFlagInvariants):
        * tools/JSDollarVM.cpp:
        (JSC::functionCreateDOMJITCheckJSCastObject):
        (JSC::JSDollarVM::finishCreation):
        (JSC::functionCreateDOMJITCheckSubClassObject): Deleted.

2020-05-27  Darin Adler  <darin@apple.com>

        [Cocoa] Pass all defines from Platform.h to various scripts, not just the ones from .xcconfig
        https://bugs.webkit.org/show_bug.cgi?id=212451

        Reviewed by Sam Weinig.

        * DerivedSources.make: Run the preprocessor on Platform.h and parse the output into
        FEATURE_AND_PLATFORM_DEFINES. Use that and FEATURE_AND_PLATFORM_DEFINE_DEPENDENCIES
        whenever we need a list of defines. Also took out some Windows-specific stuff since
        this is now only used on Mac platforms.

2020-05-28  Michael Catanzaro  <mcatanzaro@gnome.org>

        Web Inspector: generate_cpp_protocol_types_header.py:294: SyntaxWarning: "is" with a literal. Did you mean "=="?
        https://bugs.webkit.org/show_bug.cgi?id=212468

        Reviewed by Timothy Hatcher.

        Use "==" instead of "is" to compare against 0.

        * inspector/scripts/codegen/generate_cpp_protocol_types_header.py:

2020-05-28  Mark Lam  <mark.lam@apple.com>

        Gardening: Add an assertNoException() to placate the exception checker and green the bots.
        https://bugs.webkit.org/show_bug.cgi?id=212248

        Not reviewed.

        This solution was pointed out by Caio Lima in https://bugs.webkit.org/show_bug.cgi?id=212248#c10.

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

2020-05-27  Saam Barati  <sbarati@apple.com>

        hasOwnProperty inside structure property for-in loop should use an opcode like has_structure_property but for hasOwnProperty
        https://bugs.webkit.org/show_bug.cgi?id=212248

        Reviewed by Keith Miller.

        This patch applies the same principles from r262083 but to hasOwnProperty.
        
        In this patch, we have a fast path for this syntactic pattern when
        iterating structure properties:
        
        for (let <p> in <o>)
            if (<o>.hasOwnProperty(<p>))
        
        We look for both <p> and <o> as resolve nodes, and we look for them being the
        same values both in the header and inside the body.
        
        Using a simple static analysis, when we detect this pattern, we compare the
        result of `<o>.hasOwnProperty` to the original hasOwnProperty function. If
        it's the same, we execute the fast path new bytecode has_own_structure_property,
        which on the fast path is two loads, a compare and branch, and a materialization of
        the boolean constant true.
        
        On the slow path, has_own_structure_property just executes the runtime code 
        for hasOwnProperty.
        
        In my testing, this seems like it might be 3-5% faster on Speedometer 2's
        react subtests. I was getting some noise when running the tests locally,
        so I can't say for certain it's a definite speedup. But the data implies
        it has a good chance at being a speedup.

        * builtins/BuiltinNames.h:
        * bytecode/BytecodeList.rb:
        * bytecode/BytecodeUseDef.cpp:
        (JSC::computeUsesForBytecodeIndexImpl):
        (JSC::computeDefsForBytecodeIndexImpl):
        * bytecode/LinkTimeConstant.h:
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitWideJumpIfNotFunctionHasOwnProperty):
        (JSC::BytecodeGenerator::recordHasOwnStructurePropertyInForInLoop):
        (JSC::BytecodeGenerator::emitHasOwnStructureProperty):
        (JSC::BytecodeGenerator::pushStructureForInScope):
        (JSC::StructureForInContext::finalize):
        (JSC::BytecodeGenerator::findStructureForInContext):
        * bytecompiler/BytecodeGenerator.h:
        (JSC::StructureForInContext::StructureForInContext):
        (JSC::StructureForInContext::base const):
        (JSC::StructureForInContext::addHasOwnPropertyJump):
        * bytecompiler/Label.h:
        (JSC::GenericBoundLabel::GenericBoundLabel):
        * bytecompiler/NodesCodegen.cpp:
        (JSC::HasOwnPropertyFunctionCallDotNode::emitBytecode):
        (JSC::ForInNode::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/DFGNodeType.h:
        * dfg/DFGOperations.cpp:
        * dfg/DFGOperations.h:
        * dfg/DFGPredictionPropagationPhase.cpp:
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileHasStructureProperty):
        (JSC::DFG::SpeculativeJIT::compileHasOwnStructurePropertyImpl):
        (JSC::DFG::SpeculativeJIT::compileHasOwnStructureProperty):
        (JSC::DFG::SpeculativeJIT::compileInStructureProperty):
        * dfg/DFGSpeculativeJIT.h:
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileNode):
        (JSC::FTL::DFG::LowerDFGToB3::compileHasOwnStructureProperty):
        * jit/JIT.cpp:
        (JSC::JIT::privateCompileMainPass):
        (JSC::JIT::privateCompileSlowCases):
        * jit/JIT.h:
        * jit/JITOpcodes.cpp:
        (JSC::JIT::emit_op_has_structure_propertyImpl):
        (JSC::JIT::emit_op_has_structure_property):
        (JSC::JIT::emit_op_has_own_structure_property):
        (JSC::JIT::emit_op_in_structure_property):
        * jit/JITOpcodes32_64.cpp:
        (JSC::JIT::emit_op_has_structure_propertyImpl):
        (JSC::JIT::emit_op_has_structure_property):
        (JSC::JIT::emit_op_has_own_structure_property):
        (JSC::JIT::emit_op_in_structure_property):
        * llint/LowLevelInterpreter.asm:
        * llint/LowLevelInterpreter64.asm:
        * parser/ASTBuilder.h:
        (JSC::ASTBuilder::makeFunctionCallNode):
        * parser/NodeConstructors.h:
        (JSC::HasOwnPropertyFunctionCallDotNode::HasOwnPropertyFunctionCallDotNode):
        * parser/Nodes.h:
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/CommonSlowPaths.h:
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        * runtime/ObjectPrototype.cpp:
        (JSC::objectPrototypeHasOwnProperty):
        (JSC::objectProtoFuncHasOwnProperty):
        * runtime/ObjectPrototype.h:

2020-05-27  Yusuke Suzuki  <ysuzuki@apple.com>

        [ macOS iOS ] REGRESSION(r261600?): imported/w3c/web-platform-tests/html/dom/reflection-embedded.html & imported/w3c/web-platform-tests/html/dom/reflection-forms.html are flaky failures
        https://bugs.webkit.org/show_bug.cgi?id=212430

        Reviewed by Saam Barati.

        r261600 added IsConstructor rule to DFG AI. That rule is saying that if the object is not JSFunction and not ProxyObject,
        then it must not be a constructor. But this is wrong since any objects can implement getConstructData and DOM constructors
        are actually implementing it while it is not JSFunction and it is not ProxyObject. This patch removes that rule.

        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * tools/JSDollarVM.cpp:

2020-05-27  Saam Barati  <sbarati@apple.com>

        Limit memory used by wasm/references/multitable.js on memory limited devices
        https://bugs.webkit.org/show_bug.cgi?id=212437

        Reviewed by Keith Miller.

        * tools/JSDollarVM.cpp:
        (JSC::functionIsMemoryLimited):
        (JSC::JSDollarVM::finishCreation):

2020-05-27  David Kilzer  <ddkilzer@apple.com>

        REGRESSION: Build errors during JavaScriptCore "Generate Derived Sources" about missing Availability.h header and invalid SDKROOT [-Wmissing-sysroot]
        <https://webkit.org/b/212436>

        Unreviewed build fix.

        * Scripts/generate-derived-sources.sh: Pass SDKROOT to `make`
        command from the current environment.

2020-05-27  Mark Lam  <mark.lam@apple.com>

        Add missing #include for when LLINT_TRACING is enabled.
        https://bugs.webkit.org/show_bug.cgi?id=212433

        Reviewed by Tadeu Zagallo.

        * llint/LLIntExceptions.cpp:

2020-05-27  Devin Rousso  <drousso@apple.com>

        Web Inspector: replace `featureGuard` and `availability` with a combined `condition` that accepts any macro
        https://bugs.webkit.org/show_bug.cgi?id=210014

        Reviewed by Brian Burg.

        Previously, the generated InspectorBackendCommands.js would include code for things that the
        backend doesn't actually support. By using actual macros and preprocessing that file, we can
        ensure that the frontend doesn't incorrectly think that something is supported by the page
        being inspected:
         - the `Canvas` commands and events related to shader programs/pipelines should only exist
           when the corresponding context type exists, namely `ENABLE(WEBGL)` and `ENABLE(WEBGPU)`.
         - iOS doesn't support showing rulers, so create a variant of `DOM.setInspectModeEnabled`
           that only exists for `PLATFORM(IOS_FAMILY)` that doesn't have the `showRulers` optional
           parameter, as well as removing `Page.setShowRulers` entirely.
         - setting the forced appearance should only be possible if dark mode is supported.
         - web archives only exist if CF is used.

        * inspector/protocol/CPUProfiler.json:
        * inspector/protocol/Canvas.json:
        * inspector/protocol/DOM.json:
        * inspector/protocol/IndexedDB.json:
        * inspector/protocol/Inspector.json:
        * inspector/protocol/Memory.json:
        * inspector/protocol/Page.json:
        * inspector/protocol/ServiceWorker.json:

        * Scripts/generate-derived-sources.sh:
        Set `CC` if it hasn't already been set.

        * DerivedSources.make:
        * DerivedSources-input.xcfilelist:
        Preprocess `InspectorBackendCommands.js.in` to get an accurate `InspectorBackendCommands.js`
        that follows the logic/description above.

        * CMakeLists.txt:
        Create a new `InspectorBackendCommands` target now that `InspectorBackendCommands.js` is
        generated seprately from the rest of the protocol files.

        * Configurations/FeatureDefines.xcconfig:
        Add `ENABLE_WEB_ARCHIVE` since it's always enabled in wtf/PlatformEnableCocoa.h.

        * inspector/scripts/generate-inspector-protocol-bindings.py:
        (generate_from_specification):
        (generate_from_specification.load_specification):
        * inspector/scripts/codegen/generator.py:
        (Generator.__init__):
        (Generator.model):
        (Generator.set_generator_setting):
        (Generator.type_declarations_for_domain):
        (Generator.commands_for_domain):
        (Generator.events_for_domain):
        (Generator.wrap_with_guard_for_condition): Added.
        (Generator.platform): Deleted.
        (Generator.can_generate_platform): Deleted.
        (Generator.wrap_with_guard_for_domain): Deleted.
        (Generator.wrap_with_guard): Deleted.
        * inspector/scripts/codegen/models.py:
        (Frameworks):
        (Protocol.parse_domain):
        (Protocol.parse_type_declaration):
        (Protocol.parse_command):
        (Protocol.parse_event):
        (Domain.__init__):
        (TypeDeclaration.__init__):
        (Command.__init__):
        (Event.__init__):
        (Platform): Deleted.
        (Platform.__init__): Deleted.
        (Platform.fromString): Deleted.
        (Platforms): Deleted.
        (Platforms.__metaclass__): Deleted.
        (Platforms.__metaclass__.__iter__): Deleted.
        * inspector/scripts/codegen/generator_templates.py:
        Remove `platform` as it is handled by `condition`.

        * inspector/scripts/codegen/preprocess.pl: Copied from Source/WebCore/bindings/scripts/preprocessor.pm.

        * inspector/scripts/codegen/generate_js_backend_commands.py:
        (JSBackendCommandsGenerator.output_filename):
        (JSBackendCommandsGenerator.generate_domain):
        Output to `InspectorBackendCommands.js.in` that includes `#if` for preprocessing.

        * inspector/scripts/codegen/cpp_generator_templates.py:
        * inspector/scripts/codegen/generate_cpp_alternate_backend_dispatcher_header.py:
        (CppAlternateBackendDispatcherHeaderGenerator.generate_output):
        (CppAlternateBackendDispatcherHeaderGenerator._generate_handler_declarations_for_domain):
        (CppAlternateBackendDispatcherHeaderGenerator._generate_handler_declaration_for_command):
        * inspector/scripts/codegen/generate_cpp_backend_dispatcher_header.py:
        (CppBackendDispatcherHeaderGenerator._generate_alternate_handler_forward_declarations_for_domains.Alternate):
        (CppBackendDispatcherHeaderGenerator._generate_handler_declarations_for_domain):
        (CppBackendDispatcherHeaderGenerator._generate_handler_declaration_for_command):
        (CppBackendDispatcherHeaderGenerator._generate_async_handler_declaration_for_command):
        (CppBackendDispatcherHeaderGenerator._generate_dispatcher_declarations_for_domain):
        (CppBackendDispatcherHeaderGenerator._generate_dispatcher_declaration_for_command):
        * inspector/scripts/codegen/generate_cpp_backend_dispatcher_implementation.py:
        (CppBackendDispatcherImplementationGenerator.generate_output):
        (CppBackendDispatcherImplementationGenerator._generate_handler_class_destructor_for_domain):
        (CppBackendDispatcherImplementationGenerator._generate_dispatcher_implementations_for_domain):
        (CppBackendDispatcherImplementationGenerator._generate_small_dispatcher_switch_implementation_for_domain):
        (CppBackendDispatcherImplementationGenerator._generate_large_dispatcher_switch_implementation_for_domain):
        (CppBackendDispatcherImplementationGenerator._generate_async_dispatcher_class_for_domain):
        (CppBackendDispatcherImplementationGenerator._generate_dispatcher_implementation_for_command):
        * inspector/scripts/codegen/generate_cpp_frontend_dispatcher_header.py:
        (CppFrontendDispatcherHeaderGenerator._generate_dispatcher_declarations_for_domain):
        (CppFrontendDispatcherHeaderGenerator._generate_dispatcher_declaration_for_event):
        * inspector/scripts/codegen/generate_cpp_frontend_dispatcher_implementation.py:
        (CppFrontendDispatcherImplementationGenerator._generate_dispatcher_implementations_for_domain):
        (CppFrontendDispatcherImplementationGenerator._generate_dispatcher_implementation_for_event):
        * inspector/scripts/codegen/generate_cpp_protocol_types_header.py:
        (CppProtocolTypesHeaderGenerator._generate_versions):
        * inspector/scripts/codegen/generate_cpp_protocol_types_implementation.py:
        (CppProtocolTypesImplementationGenerator._generate_enum_conversion_methods_for_domain.generate_conversion_method_body):
        (CppProtocolTypesImplementationGenerator._generate_enum_conversion_methods_for_domain):
        (CppProtocolTypesImplementationGenerator._generate_open_field_names):
        (CppProtocolTypesImplementationGenerator._generate_builders_for_domain):
        * inspector/scripts/codegen/objc_generator_templates.py:
        * inspector/scripts/codegen/generate_objc_backend_dispatcher_header.py:
        (ObjCBackendDispatcherHeaderGenerator._generate_objc_handler_declarations_for_domain):
        (ObjCBackendDispatcherHeaderGenerator._generate_objc_handler_declaration_for_command):
        * inspector/scripts/codegen/generate_objc_backend_dispatcher_implementation.py:
        (ObjCBackendDispatcherImplementationGenerator._generate_handler_implementation_for_domain):
        (ObjCBackendDispatcherImplementationGenerator._generate_handler_implementation_for_command):
        * inspector/scripts/codegen/generate_objc_header.py:
        (add_newline):
        (ObjCHeaderGenerator.generate_output):
        (ObjCHeaderGenerator._generate_forward_declarations):
        (ObjCHeaderGenerator._generate_enums):
        (ObjCHeaderGenerator._generate_types):
        (ObjCHeaderGenerator._generate_type_interface):
        (ObjCHeaderGenerator._generate_command_protocols):
        (ObjCHeaderGenerator._generate_single_command_protocol):
        (ObjCHeaderGenerator._generate_event_interfaces):
        (ObjCHeaderGenerator._generate_single_event_interface):
        (ObjCHeaderGenerator._generate_enum_for_platforms): Deleted.
        * inspector/scripts/codegen/generate_objc_protocol_type_conversions_header.py:
        (add_newline):
        (ObjCProtocolTypeConversionsHeaderGenerator.generate_output):
        (ObjCProtocolTypeConversionsHeaderGenerator._generate_enum_conversion_functions):
        (ObjCProtocolTypeConversionsHeaderGenerator._generate_enum_conversion_for_platforms): Deleted.
        * inspector/scripts/codegen/generate_objc_protocol_type_conversions_implementation.py:
        (add_newline):
        (ObjCProtocolTypeConversionsImplementationGenerator._generate_type_factory_category_interface):
        (ObjCProtocolTypeConversionsImplementationGenerator._generate_type_factory_method_declaration):
        (ObjCProtocolTypeConversionsImplementationGenerator._generate_type_factory_category_implementation):
        (ObjCProtocolTypeConversionsImplementationGenerator._generate_type_factory_method_implementation):
        * inspector/scripts/codegen/generate_objc_protocol_types_implementation.py:
        (add_newline):
        (ObjCProtocolTypesImplementationGenerator.generate_type_implementations):
        (ObjCProtocolTypesImplementationGenerator.generate_type_implementation):
        Wrap each domain, type, command, and event with the associated `condition` (if it exists).

        * inspector/scripts/tests/command-targetType-matching-domain-debuggableType.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/command-targetType-matching-domain-debuggableType.json.
        * inspector/scripts/tests/commands-with-async-attribute.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/commands-with-async-attribute.json.
        * inspector/scripts/tests/commands-with-optional-call-return-parameters.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/commands-with-optional-call-return-parameters.json.
        * inspector/scripts/tests/definitions-with-mac-platform.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/mac/definitions-with-mac-platform.json.
        * inspector/scripts/tests/domain-debuggableTypes.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/domain-debuggableTypes.json.
        * inspector/scripts/tests/domain-targetType-matching-domain-debuggableType.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/domain-targetType-matching-domain-debuggableType.json.
        * inspector/scripts/tests/domain-targetTypes.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/domain-targetTypes.json.
        * inspector/scripts/tests/domains-with-varying-command-sizes.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/domains-with-varying-command-sizes.json.
        * inspector/scripts/tests/enum-values.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/enum-values.json.
        * inspector/scripts/tests/event-targetType-matching-domain-debuggableType.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/event-targetType-matching-domain-debuggableType.json.
        * inspector/scripts/tests/events-with-optional-parameters.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/events-with-optional-parameters.json.
        * inspector/scripts/tests/expected/command-targetType-matching-domain-debuggableType.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/command-targetType-matching-domain-debuggableType.json-result.
        * inspector/scripts/tests/expected/commands-with-async-attribute.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/commands-with-async-attribute.json-result.
        * inspector/scripts/tests/expected/commands-with-optional-call-return-parameters.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/commands-with-optional-call-return-parameters.json-result.
        * inspector/scripts/tests/expected/definitions-with-mac-platform.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/mac/expected/definitions-with-mac-platform.json-result.
        * inspector/scripts/tests/expected/domain-debuggableTypes.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/domain-debuggableTypes.json-result.
        * inspector/scripts/tests/expected/domain-targetType-matching-domain-debuggableType.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/domain-targetType-matching-domain-debuggableType.json-result.
        * inspector/scripts/tests/expected/domain-targetTypes.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/domain-targetTypes.json-result.
        * inspector/scripts/tests/expected/domains-with-varying-command-sizes.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/domains-with-varying-command-sizes.json-result.
        * inspector/scripts/tests/expected/enum-values.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/enum-values.json-result.
        * inspector/scripts/tests/expected/event-targetType-matching-domain-debuggableType.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/event-targetType-matching-domain-debuggableType.json-result.
        * inspector/scripts/tests/expected/events-with-optional-parameters.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/events-with-optional-parameters.json-result.
        * inspector/scripts/tests/expected/fail-on-command-targetType-matching-domain-debuggableType.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-command-targetType-matching-domain-debuggableType.json-error.
        * inspector/scripts/tests/expected/fail-on-command-targetTypes-type.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-command-targetTypes-type.json-error.
        * inspector/scripts/tests/expected/fail-on-command-targetTypes-value.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-command-targetTypes-value.json-error.
        * inspector/scripts/tests/expected/fail-on-domain-debuggableTypes-type.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-domain-debuggableTypes-type.json-error.
        * inspector/scripts/tests/expected/fail-on-domain-debuggableTypes-value.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-domain-debuggableTypes-value.json-error.
        * inspector/scripts/tests/expected/fail-on-domain-targetType-matching-domain-debuggableType.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-domain-targetType-matching-domain-debuggableType.json-error.
        * inspector/scripts/tests/expected/fail-on-domain-targetTypes-type.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-domain-targetTypes-type.json-error.
        * inspector/scripts/tests/expected/fail-on-domain-targetTypes-value.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-domain-targetTypes-value.json-error.
        * inspector/scripts/tests/expected/fail-on-duplicate-command-call-parameter-names.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-duplicate-command-call-parameter-names.json-error.
        * inspector/scripts/tests/expected/fail-on-duplicate-command-return-parameter-names.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-duplicate-command-return-parameter-names.json-error.
        * inspector/scripts/tests/expected/fail-on-duplicate-event-parameter-names.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-duplicate-event-parameter-names.json-error.
        * inspector/scripts/tests/expected/fail-on-duplicate-type-declarations.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-duplicate-type-declarations.json-error.
        * inspector/scripts/tests/expected/fail-on-duplicate-type-member-names.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-duplicate-type-member-names.json-error.
        * inspector/scripts/tests/expected/fail-on-enum-with-no-values.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-enum-with-no-values.json-error.
        * inspector/scripts/tests/expected/fail-on-event-targetType-matching-domain-debuggableType.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-event-targetType-matching-domain-debuggableType.json-error.
        * inspector/scripts/tests/expected/fail-on-event-targetTypes-type.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-event-targetTypes-type.json-error.
        * inspector/scripts/tests/expected/fail-on-event-targetTypes-value.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-event-targetTypes-value.json-error.
        * inspector/scripts/tests/expected/fail-on-number-typed-optional-parameter-flag.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-number-typed-optional-parameter-flag.json-error.
        * inspector/scripts/tests/expected/fail-on-number-typed-optional-type-member.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-number-typed-optional-type-member.json-error.
        * inspector/scripts/tests/expected/fail-on-string-typed-optional-parameter-flag.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-string-typed-optional-parameter-flag.json-error.
        * inspector/scripts/tests/expected/fail-on-string-typed-optional-type-member.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-string-typed-optional-type-member.json-error.
        * inspector/scripts/tests/expected/fail-on-type-declaration-using-type-reference.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-type-declaration-using-type-reference.json-error.
        * inspector/scripts/tests/expected/fail-on-type-reference-as-primitive-type.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-type-reference-as-primitive-type.json-error.
        * inspector/scripts/tests/expected/fail-on-type-with-lowercase-name.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-type-with-lowercase-name.json-error.
        * inspector/scripts/tests/expected/fail-on-unknown-type-reference-in-type-declaration.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-unknown-type-reference-in-type-declaration.json-error.
        * inspector/scripts/tests/expected/fail-on-unknown-type-reference-in-type-member.json-error: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/fail-on-unknown-type-reference-in-type-member.json-error.
        * inspector/scripts/tests/expected/generate-domains-with-feature-guards.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/generate-domains-with-feature-guards.json-result.
        * inspector/scripts/tests/expected/same-type-id-different-domain.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/same-type-id-different-domain.json-result.
        * inspector/scripts/tests/expected/shadowed-optional-type-setters.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/shadowed-optional-type-setters.json-result.
        * inspector/scripts/tests/expected/should-strip-comments.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/should-strip-comments.json-result.
        * inspector/scripts/tests/expected/type-declaration-aliased-primitive-type.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/type-declaration-aliased-primitive-type.json-result.
        * inspector/scripts/tests/expected/type-declaration-array-type.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/type-declaration-array-type.json-result.
        * inspector/scripts/tests/expected/type-declaration-enum-type.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/type-declaration-enum-type.json-result.
        * inspector/scripts/tests/expected/type-declaration-object-type.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/type-declaration-object-type.json-result.
        * inspector/scripts/tests/expected/type-requiring-runtime-casts.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/type-requiring-runtime-casts.json-result.
        * inspector/scripts/tests/expected/type-with-open-parameters.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/type-with-open-parameters.json-result.
        * inspector/scripts/tests/expected/version.json-result: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/expected/version.json-result.
        * inspector/scripts/tests/fail-on-command-targetType-matching-domain-debuggableType.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-command-targetType-matching-domain-debuggableType.json.
        * inspector/scripts/tests/fail-on-command-targetTypes-type.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-command-targetTypes-type.json.
        * inspector/scripts/tests/fail-on-command-targetTypes-value.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-command-targetTypes-value.json.
        * inspector/scripts/tests/fail-on-domain-debuggableTypes-type.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-domain-debuggableTypes-type.json.
        * inspector/scripts/tests/fail-on-domain-debuggableTypes-value.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-domain-debuggableTypes-value.json.
        * inspector/scripts/tests/fail-on-domain-targetType-matching-domain-debuggableType.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-domain-targetType-matching-domain-debuggableType.json.
        * inspector/scripts/tests/fail-on-domain-targetTypes-type.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-domain-targetTypes-type.json.
        * inspector/scripts/tests/fail-on-domain-targetTypes-value.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-domain-targetTypes-value.json.
        * inspector/scripts/tests/fail-on-duplicate-command-call-parameter-names.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-duplicate-command-call-parameter-names.json.
        * inspector/scripts/tests/fail-on-duplicate-command-return-parameter-names.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-duplicate-command-return-parameter-names.json.
        * inspector/scripts/tests/fail-on-duplicate-event-parameter-names.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-duplicate-event-parameter-names.json.
        * inspector/scripts/tests/fail-on-duplicate-type-declarations.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-duplicate-type-declarations.json.
        * inspector/scripts/tests/fail-on-duplicate-type-member-names.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-duplicate-type-member-names.json.
        * inspector/scripts/tests/fail-on-enum-with-no-values.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-enum-with-no-values.json.
        * inspector/scripts/tests/fail-on-event-targetType-matching-domain-debuggableType.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-event-targetType-matching-domain-debuggableType.json.
        * inspector/scripts/tests/fail-on-event-targetTypes-type.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-event-targetTypes-type.json.
        * inspector/scripts/tests/fail-on-event-targetTypes-value.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-event-targetTypes-value.json.
        * inspector/scripts/tests/fail-on-number-typed-optional-parameter-flag.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-number-typed-optional-parameter-flag.json.
        * inspector/scripts/tests/fail-on-number-typed-optional-type-member.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-number-typed-optional-type-member.json.
        * inspector/scripts/tests/fail-on-string-typed-optional-parameter-flag.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-string-typed-optional-parameter-flag.json.
        * inspector/scripts/tests/fail-on-string-typed-optional-type-member.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-string-typed-optional-type-member.json.
        * inspector/scripts/tests/fail-on-type-declaration-using-type-reference.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-type-declaration-using-type-reference.json.
        * inspector/scripts/tests/fail-on-type-reference-as-primitive-type.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-type-reference-as-primitive-type.json.
        * inspector/scripts/tests/fail-on-type-with-lowercase-name.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-type-with-lowercase-name.json.
        * inspector/scripts/tests/fail-on-unknown-type-reference-in-type-declaration.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-unknown-type-reference-in-type-declaration.json.
        * inspector/scripts/tests/fail-on-unknown-type-reference-in-type-member.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/fail-on-unknown-type-reference-in-type-member.json.
        * inspector/scripts/tests/generate-domains-with-feature-guards.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/generate-domains-with-feature-guards.json.
        * inspector/scripts/tests/same-type-id-different-domain.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/same-type-id-different-domain.json.
        * inspector/scripts/tests/shadowed-optional-type-setters.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/shadowed-optional-type-setters.json.
        * inspector/scripts/tests/should-strip-comments.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/should-strip-comments.json.
        * inspector/scripts/tests/type-declaration-aliased-primitive-type.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/type-declaration-aliased-primitive-type.json.
        * inspector/scripts/tests/type-declaration-array-type.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/type-declaration-array-type.json.
        * inspector/scripts/tests/type-declaration-enum-type.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/type-declaration-enum-type.json.
        * inspector/scripts/tests/type-declaration-object-type.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/type-declaration-object-type.json.
        * inspector/scripts/tests/type-requiring-runtime-casts.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/type-requiring-runtime-casts.json.
        * inspector/scripts/tests/type-with-open-parameters.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/type-with-open-parameters.json.
        * inspector/scripts/tests/version.json: Renamed from Source/JavaScriptCore/inspector/scripts/tests/generic/version.json.
        * inspector/scripts/tests/generic/definitions-with-mac-platform.json: Removed.
        * inspector/scripts/tests/generic/expected/definitions-with-mac-platform.json-result: Removed.
        * inspector/scripts/tests/generic/fail-on-command-with-invalid-platform.json: Removed.
        * inspector/scripts/tests/generic/expected/fail-on-command-with-invalid-platform.json-error: Removed.
        * inspector/scripts/tests/generic/fail-on-type-with-invalid-platform.json: Removed.
        * inspector/scripts/tests/generic/expected/fail-on-type-with-invalid-platform.json-error: Removed.
        * inspector/scripts/tests/ios/definitions-with-mac-platform.json: Removed.
        * inspector/scripts/tests/ios/expected/definitions-with-mac-platform.json-result: Removed.
        * inspector/scripts/tests/all/definitions-with-mac-platform.json: Removed.
        * inspector/scripts/tests/all/expected/definitions-with-mac-platform.json-result: Removed.
        Don't separate the inspector generator tests by platform.

2020-05-27  Keith Miller  <keith_miller@apple.com>

        in_structure_property needs to handle constants on the RHS of the "in"
        https://bugs.webkit.org/show_bug.cgi?id=212399

        Reviewed by Saam Barati.

        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):

2020-05-27  Keith Rollin  <krollin@apple.com>

        Enable the use of XCBuild by default in Apple builds
        https://bugs.webkit.org/show_bug.cgi?id=209890
        <rdar://problem/44182078>

        Unreviewed build fix. Check the value of XCODE_VERSION_ACTUAL rather
        than XCODE_VERSION_MAJOR when determining whether to use the XCBuild
        or non-XCBuild method of running header post-processing scripts.

        * JavaScriptCore.xcodeproj/project.pbxproj:

2020-05-26  Mark Lam  <mark.lam@apple.com>

        Add some new emitters to the X86_64 and ARM64 MacroAssemblers.
        https://bugs.webkit.org/show_bug.cgi?id=212385

        Reviewed by Robin Morisset.

        This patch adds these MacroAssembler emitters: 
            clearBit64
            clearBits64WithMask
            countTrailingZeros64WithoutNullCheck

        clearBit64 clears a bit.

        clearBits64WithMask does the equivalent of and64 with the 1's complement of the
        provided mask.

        countTrailingZeros64WithoutNullCheck does the same thing as countTrailingZeros64,
        except that it assumes that the word in the register it is processing will never
        be null, and therefore skips the null check.  This is useful in code generation
        that already does a null check ahead of time.  So, there's no need to do a
        redundant null check.

        Also added testmasm tests for these emitters.

        * assembler/AbortReason.h:
        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::clearBit64):
        (JSC::MacroAssemblerARM64::clearBits64WithMask):
        (JSC::MacroAssemblerARM64::countTrailingZeros64WithoutNullCheck):
        * assembler/MacroAssemblerX86_64.h:
        (JSC::MacroAssemblerX86_64::countTrailingZeros64WithoutNullCheck):
        (JSC::MacroAssemblerX86_64::clearBit64):
        (JSC::MacroAssemblerX86_64::clearBits64WithMask):
        * assembler/X86Assembler.h:
        (JSC::X86Assembler::btrq_rr):
        * assembler/testmasm.cpp:
        (JSC::testClearBit64):
        (JSC::testClearBits64WithMask):
        (JSC::testClearBits64WithMaskTernary):
        (JSC::testCountTrailingZeros64Impl):
        (JSC::testCountTrailingZeros64):
        (JSC::testCountTrailingZeros64WithoutNullCheck):
        (JSC::run):

2020-05-26  Yoshiaki JITSUKAWA  <yoshiaki.jitsukawa@sony.com>

        [PlayStation] Enable RemoteWebInspector
        https://bugs.webkit.org/show_bug.cgi?id=212312

        Reviewed by Don Olmstead.

        * API/JSRemoteInspectorServer.cpp:
        Fix compile error.
        * PlatformPlayStation.cmake:
        Add JSRemoteInspectorServer.h to the public header list.
        * inspector/remote/socket/posix/RemoteInspectorSocketPOSIX.cpp:
        Set PlayStation specific socket option.

2020-05-26  Alexey Shvayka  <shvaikalesh@gmail.com>

        IteratorClose should suppress GetMethod errors
        https://bugs.webkit.org/show_bug.cgi?id=212378

        Reviewed by Keith Miller.

        This patch implements recent spec change [1] that prevents "return" method lookup error
        from overriding outer exception, aligning JSC with V8 and SpiderMonkey.

        It is accomplished by moving pushTry() before emitGetById() in BytecodeGenerator.cpp
        (covered by test262 suite) and removal of RETURN_IF_EXCEPTION in IteratorOperations.cpp
        (added a stress test).

        Before this patch, JSC partly implemented the spec change [1] by suppressing TypeError
        if "return" method of iterator was not callable.

        BytecodeGenerator::emitDelegateYield() is intentionally left unchanged.
        Also, this patch utilizes emitIteratorGenericClose() to avoid code duplication.
        for/of microbenchmarks are neutral.

        [1]: https://github.com/tc39/ecma262/pull/1408

        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitGenericEnumeration):
        (JSC::BytecodeGenerator::emitEnumeration):
        * runtime/IteratorOperations.cpp:
        (JSC::iteratorClose):

2020-05-26  Mark Lam  <mark.lam@apple.com>

        SamplingProfiler::takeSample() should not assume that ENABLE(WEBASSEMBLY) means Wasm is enabled.
        https://bugs.webkit.org/show_bug.cgi?id=212382

        Reviewed by Saam Barati.

        Wasm can still be disabled at runtime with JSC options.  Fixing this will allow
        sampling profiler tests to run with JSC_useJIT=0 without crashing.

        * runtime/SamplingProfiler.cpp:
        (JSC::FrameWalker::FrameWalker):
        (JSC::FrameWalker::recordJITFrame):
        (JSC::CFrameWalker::CFrameWalker):
        (JSC::SamplingProfiler::takeSample):

2020-05-26  Keith Rollin  <krollin@apple.com>

        Enable the use of XCBuild by default in Apple builds
        https://bugs.webkit.org/show_bug.cgi?id=209890
        <rdar://problem/44182078>

        Reviewed by Darin Adler.

        Switch from the "legacy" Xcode build system to the "new" build system
        (also known as "XCBuild"). Switching to the new system speeds up
        builds by a small percentage, better validates projects for
        build-related issues (such as dependency cycles), lets WebKit benefit
        from future improvements in XCBuild such as those coming from the
        underlying llbuild open source project, and prepares us for any other
        tools built for this new ecosystem.

        Specific changes:

        - Remove Xcode project and workspace settings that selected the Build
          system, allowing the default to take hold (which is currently the
          New build system).
        - Updated webkitdirs.pm with a terser check for Xcode version.
        - Update build-webkit and Makefile.shared to be explicit when using
          the old build system (no longer treat it as a default or fall-back
          configuration).
        - Update various xcconfig files similarly to treat the default as
          using the new build system.
        - Update various post-processing build steps to check for Xcode 11.4
          and to no longer treat the default as using the old build system.

        * Configurations/JavaScriptCore.xcconfig:
        * JavaScriptCore.xcodeproj/project.pbxproj:

2020-05-23  Paulo Matos  <pmatos@igalia.com>

        Fix non-unified builds for x86_64
        https://bugs.webkit.org/show_bug.cgi?id=212297

        Reviewed by Adrian Perez de Castro.

        * b3/B3BasicBlock.cpp:
        * b3/B3CaseCollection.cpp:
        * b3/B3DuplicateTails.cpp:
        * b3/B3EnsureLoopPreHeaders.cpp:
        * b3/B3FenceValue.cpp:
        * b3/B3HoistLoopInvariantValues.cpp:
        * b3/B3LegalizeMemoryOffsets.cpp:
        * b3/B3LowerMacrosAfterOptimizations.cpp:
        * b3/B3LowerToAir.cpp:
        * b3/B3MathExtras.cpp:
        * b3/B3MemoryValue.cpp:
        * b3/B3Procedure.cpp:
        * b3/B3StackmapValue.cpp:
        * b3/B3SwitchValue.cpp:
        * b3/B3UseCounts.cpp:
        * b3/B3Validate.cpp:
        * b3/B3VariableValue.cpp:
        * b3/B3WasmAddressValue.cpp:
        * b3/B3WasmBoundsCheckValue.cpp:
        * ftl/FTLCommonValues.cpp:
        * ftl/FTLCompile.cpp:
        * ftl/FTLOSREntry.cpp:
        * ftl/FTLOSRExitCompiler.cpp:
        * wasm/WasmInstance.cpp:
        * wasm/WasmStreamingParser.cpp:
        * wasm/js/JSToWasm.cpp:
        * wasm/js/JSToWasmICCallee.cpp:
        * wasm/js/JSWebAssembly.cpp:
        * wasm/js/JSWebAssemblyCodeBlock.cpp:
        * wasm/js/WebAssemblyCompileErrorConstructor.cpp:
        * wasm/js/WebAssemblyCompileErrorPrototype.cpp:
        * wasm/js/WebAssemblyFunction.cpp:
        * wasm/js/WebAssemblyFunctionBase.cpp:
        * wasm/js/WebAssemblyGlobalPrototype.cpp:
        * wasm/js/WebAssemblyInstanceConstructor.cpp:
        * wasm/js/WebAssemblyInstancePrototype.cpp:
        * wasm/js/WebAssemblyLinkErrorConstructor.cpp:
        * wasm/js/WebAssemblyLinkErrorPrototype.cpp:
        * wasm/js/WebAssemblyMemoryConstructor.cpp:
        * wasm/js/WebAssemblyMemoryPrototype.cpp:
        * wasm/js/WebAssemblyModuleConstructor.cpp:
        * wasm/js/WebAssemblyModulePrototype.cpp:
        * wasm/js/WebAssemblyModuleRecord.cpp:
        * wasm/js/WebAssemblyRuntimeErrorConstructor.cpp:
        * wasm/js/WebAssemblyRuntimeErrorPrototype.cpp:
        * wasm/js/WebAssemblyTableConstructor.cpp:
        * wasm/js/WebAssemblyTablePrototype.cpp:

2020-05-22  Yoshiaki JITSUKAWA  <yoshiaki.jitsukawa@sony.com>

        [PlayStation] Enable JSC shell to run
        https://bugs.webkit.org/show_bug.cgi?id=212294

        Reviewed by Ross Kirsling.

        * shell/PlatformPlayStation.cmake:
        Set working directory for Visual Studio
        * shell/playstation/Initializer.cpp:
        Load libJavaScriptCore as we now build it as SHARED.

2020-05-22  Alexey Shvayka  <shvaikalesh@gmail.com>

        Array.prototype.splice doesn't set "length" of returned object
        https://bugs.webkit.org/show_bug.cgi?id=212285

        Reviewed by Darin Adler.

        This change implements step 12 of Array.prototype.splice [1], which is observable
        if result object is not JSArray, aligning JSC with V8 and SpiderMonkey.

        Only slow path of splice() is affected by this patch; zero-argument case already
        performs setLength(). Microbenchmarks are neutral.

        [1]: https://tc39.es/ecma262/#sec-array.prototype.splice

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

2020-05-22  Saam Barati  <sbarati@apple.com>

        in_by_val inside structure property for-in loop should use an opcode like has_structure_property but for "in"
        https://bugs.webkit.org/show_bug.cgi?id=212239

        Reviewed by Tadeu Zagallo.

        There is code inside Speedometer 2 that is like:
        
        ```
        for (let p in o) {
            if (p in o2)
                ...
        }
        ```
        
        Where o and o2 frequently share the same structure. Elm does this when it's
        diffing two objects. We already optimize o2[p] (get_by_val) in the above loop
        for structure properties. This patch adds that same optimization for in_by_val.
        Because we already emit a "structure" loop for for-in, where we iterate structure
        properties, the fast path for the above, where o and o2 have the same
        structure is simply a structure check followed by return true.
        
        This patch introduces the new opcode: op_in_structure_property. Its fast path is identical
        to op_has_structure_property. Its slow path, however, behaves like "in", which
        uses the HasProperty internal method, unlike op_has_structure_property,
        which uses the GetOwnProperty internal method. This behavior difference is
        observable using Proxy.
        
        This a 5% perf improvement in the Elm subtest in Speedometer 2.

        * bytecode/BytecodeList.rb:
        * bytecode/BytecodeUseDef.cpp:
        (JSC::computeUsesForBytecodeIndexImpl):
        (JSC::computeDefsForBytecodeIndexImpl):
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitInByVal):
        (JSC::rewriteOp):
        (JSC::StructureForInContext::finalize):
        * bytecompiler/BytecodeGenerator.h:
        (JSC::StructureForInContext::addInInst):
        * 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/DFGNodeType.h:
        * dfg/DFGOperations.cpp:
        * dfg/DFGOperations.h:
        * dfg/DFGPredictionPropagationPhase.cpp:
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileInStructureProperty):
        * dfg/DFGSpeculativeJIT.h:
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileNode):
        (JSC::FTL::DFG::LowerDFGToB3::compileHasStructurePropertyImpl):
        (JSC::FTL::DFG::LowerDFGToB3::compileHasStructureProperty):
        (JSC::FTL::DFG::LowerDFGToB3::compileInStructureProperty):
        * jit/JIT.cpp:
        (JSC::JIT::privateCompileMainPass):
        (JSC::JIT::privateCompileSlowCases):
        * jit/JIT.h:
        * jit/JITOpcodes.cpp:
        (JSC::JIT::emit_op_in_structure_property):
        * jit/JITOpcodes32_64.cpp:
        (JSC::JIT::emit_op_in_structure_property):
        * llint/LLIntOffsetsExtractor.cpp:
        * llint/LowLevelInterpreter.asm:
        * llint/LowLevelInterpreter64.asm:
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/CommonSlowPaths.h:
        * runtime/JSObject.cpp:
        (JSC::JSObject::hasPropertyGeneric const):
        * runtime/JSPropertyNameEnumerator.h:

2020-05-22  Keith Miller  <keith_miller@apple.com>

        Checkpoint inlined call return handler needs an exception check when dispatching
        https://bugs.webkit.org/show_bug.cgi?id=212104

        Reviewed by Yusuke Suzuki.

        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::dispatchToNextInstruction):
        (JSC::LLInt::slow_path_checkpoint_osr_exit_from_inlined_call):
        (JSC::LLInt::slow_path_checkpoint_osr_exit):

2020-05-22  Paulo Matos  <pmatos@igalia.com>

        Fix non-unified builds for i386 build
        https://bugs.webkit.org/show_bug.cgi?id=212258

        Reviewed by Adrian Perez de Castro.

        * API/JSContextRef.cpp:
        * bytecode/IntrinsicGetterAccessCase.cpp:
        * inspector/InjectedScriptHost.cpp:
        * llint/LLIntData.cpp:
        * llint/LLIntThunks.cpp:
        * runtime/Exception.cpp:
        * runtime/ExecutableBase.cpp:
        * runtime/JSBigInt.cpp:
        * runtime/JSInternalPromiseConstructor.cpp:
        * runtime/JSString.cpp:
        * runtime/ScopedArgumentsTable.cpp:
        * runtime/ScriptExecutable.cpp:
        * runtime/SparseArrayValueMap.cpp:
        * runtime/StructureRareData.cpp:

2020-05-22  Paulo Matos  <pmatos@igalia.com>

        Fix typo in JSCVirtualMachine documentation

        Unreviewed Typo Fix.

        * API/glib/JSCVirtualMachine.cpp:

2020-05-21  Robin Morisset  <rmorisset@apple.com>

        Various compile-time boolean flags could/should be marked constexpr
        https://bugs.webkit.org/show_bug.cgi?id=212244

        Reviewed by Mark Lam.

        This trivial patch saves roughly 16kB from the JavaScriptCore binary in release mode.

        * b3/B3OptimizeAssociativeExpressionTrees.cpp:
        * b3/air/AirAllocateRegistersByGraphColoring.cpp:
        * b3/air/AirSimplifyCFG.cpp:
        (JSC::B3::Air::simplifyCFG):
        * b3/air/AirTmpWidth.cpp:
        (JSC::B3::Air::TmpWidth::recompute):
        * dfg/DFGPredictionPropagationPhase.cpp:
        * heap/GCIncomingRefCountedInlines.h:
        (JSC::GCIncomingRefCounted<T>::filterIncomingReferences):
        * heap/Heap.cpp:
        (JSC::Heap::updateAllocationLimits):
        * wasm/WasmEntryPlan.cpp:

2020-05-21  Robin Morisset  <rmorisset@apple.com>

        Remove AssemblerBufferWithConstantPool.h (as it has been dead for years)
        https://bugs.webkit.org/show_bug.cgi?id=212241

        Reviewed by Yusuke Suzuki.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * assembler/AssemblerBufferWithConstantPool.h: Removed.

2020-05-21  Alexey Shvayka  <shvaikalesh@gmail.com>

        Use @isUndefinedOrNull instead of abstract equality with null
        https://bugs.webkit.org/show_bug.cgi?id=210954

        Reviewed by Yusuke Suzuki.

        This patch:

        a) Replaces 2 `!== @undefined` comparisons in String.prototype.{replace,replaceAll}
        with @isUndefinedOrNull() as per spec [1], aligning JSC with V8 and SpiderMonkey.

        b) Replaces 3 `!= @undefined` and 7 `!= null` comparisons with @isUndefinedOrNull()
        as only the latter is correct with [[IsHTMLDDA]] aka MasqueradesAsUndefined objects [2].

        c) Removes @isDictionary() since it is unused, easy to inline and its name is quite
        misleading: one might expect it to perform Structure::isDictionary().

        [1]: https://tc39.es/ecma262/#sec-getmethod (step 3)
        [2]: https://tc39.es/ecma262/#sec-IsHTMLDDA-internal-slot

        * builtins/ArrayConstructor.js:
        * builtins/GlobalOperations.js:
        (globalPrivate.isDictionary): Deleted.
        * builtins/RegExpPrototype.js:
        (Symbol.split): Unobservable as there is `=== null` check in @regExpExec.
        * builtins/StringPrototype.js:
        (match):
        (replace):
        (replaceAll):
        (search):
        (split):
        * builtins/TypedArrayConstructor.js:

2020-05-21  Saam Barati  <sbarati@apple.com>

        Add an option that exposes functions on the global object to turn on and off the sampling profiler and the super sampler
        https://bugs.webkit.org/show_bug.cgi?id=212178

        Reviewed by Yusuke Suzuki.

        When profiling things like Speedometer inside the browser, it's important to
        to only enable the super sampler and the sampling profiler around the code
        that you want profiled. Otherwise, you will be profiling things that aren't
        relevant to the benchmark score. This patch adds a new option, exposeProfilersOnGlobalObject,
        which when true, will expose JS functions on the global object that allow
        enabling/disabling the super sampler and the sampling profiler. This way,
        we can change the Speedometer source code locally such that these profilers
        are only sampling code accounted for in the benchmark score.

        * bytecode/SuperSampler.cpp:
        (JSC::initializeSuperSampler):
        (JSC::enableSuperSampler):
        (JSC::disableSuperSampler):
        * bytecode/SuperSampler.h:
        * jsc.cpp:
        (jscmain):
        * runtime/JSGlobalObject.cpp:
        (JSC::enableSamplingProfiler):
        (JSC::disableSamplingProfiler):
        (JSC::enableSuperSampler):
        (JSC::disableSuperSampler):
        (JSC::JSGlobalObject::init):
        * runtime/OptionsList.h:

2020-05-21  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Fix 32bit JSBigInt with INT32_MAX < x <= UINT32_MAX
        https://bugs.webkit.org/show_bug.cgi?id=212193

        Reviewed by Mark Lam.

        In 32bit architecture, we are creating one-length JSBigInt for INT32_MIN <= x <= INT32_MAX, and two-length JSBigInt otherwise.
        This is wrong since one-length JSBigInt should cover from -UINT32_MAX <= x <= UINT32_MAX.

        This patch fixes the bug and cleans up createFrom(VM&, int64_t). And it also adds JSBigInt::createFrom(VM&, uint64_t) in preparation for [1]
        Currently, this path is not used while it was used previously because BigIntConstructor starts using JSBigInt::createFrom(VM&, double). But this
        will be used in [1], and simply the existing implementation is wrong.

        [1]: https://bugs.webkit.org/show_bug.cgi?id=190800

        * runtime/JSBigInt.cpp:
        (JSC::JSBigInt::createFromImpl):
        (JSC::JSBigInt::createFrom):
        * runtime/JSBigInt.h:

2020-05-21  Paulo Matos  <pmatos@igalia.com>

        Further non-unified build fixes
        https://bugs.webkit.org/show_bug.cgi?id=212195

        Reviewed by Adrian Perez de Castro.

        * bytecode/InstanceOfStatus.cpp:
        * heap/MarkedSpace.cpp:
        * runtime/ObjectInitializationScope.cpp:
        * runtime/ThrowScope.cpp:

2020-05-21  Alexey Shvayka  <shvaikalesh@gmail.com>

        Array.prototype.concat is incorrect with objects whose "length" exceeds 2 ** 32 - 1
        https://bugs.webkit.org/show_bug.cgi?id=212167

        Reviewed by Saam Barati.

        This patch increases "length" limit of Array.prototype.concat result to @MAX_SAFE_INTEGER
        and changes thrown error to TypeError, aligning JSC with the spec [1], V8, and SpiderMonkey.

        Also, adds missing @MAX_SAFE_INTEGER overflow check in Array.from [2] (we implement similar
        checks in other methods). SunSpider and microbenchmarks/concat-append-one.js are both neutral.

        [1]: https://tc39.es/ecma262/#sec-array.prototype.concat (steps 5.c.iii, 5.d.ii)
        [2]: https://tc39.es/ecma262/#sec-array.from (step 5.e.i)

        * builtins/ArrayConstructor.js:
        (from):
        * builtins/ArrayPrototype.js:
        (globalPrivate.concatSlowPath):

2020-05-20  Michael Saboff  <msaboff@apple.com>

        [Wasm] Limit the size of Wasm function we optimize in OMG mode
        https://bugs.webkit.org/show_bug.cgi?id=212105

        Reviewed by Filip Pizlo.

        Given that memory grows O(N^2) compiling Wasm code through the OMG path,
        we can run out of memory when compiling large Wasm functions.  This change adds
        a limit option, webAssemblyBBQFallbackSize,  When the Wasm function size is
        equal to or greater than this limit we always compile using BBQ optimization
        parameters.

        As part of this change, we still go through the OMG loop entry OSR code
        generation path for functions that are at or above the threshold, but we
        compile such functions with BBQ compilation optimization levels.
        Also for Wasm functions at or above  the threashold, we don't tier up to an
        OMG compiled normal entry function.  Instead we stay with the BBQ compiled version.

        * runtime/OptionsList.h:
        * wasm/WasmAirIRGenerator.cpp:
        (JSC::Wasm::AirIRGenerator::AirIRGenerator):
        * wasm/WasmB3IRGenerator.cpp:
        (JSC::Wasm::B3IRGenerator::B3IRGenerator):
        (JSC::Wasm::parseAndCompile):
        * wasm/WasmCompilationMode.cpp:
        (JSC::Wasm::wasmFunctionSizeCanBeOMGCompiled):
        * wasm/WasmCompilationMode.h:
        * wasm/WasmOperations.cpp:
        (JSC::Wasm::operationWasmTriggerOSREntryNow):

2020-05-19  Ross Kirsling  <ross.kirsling@sony.com>

        REGRESSION(r261755): Win/Linux non-unified builds have hundreds of link failures
        https://bugs.webkit.org/show_bug.cgi?id=212111

        Unreviewed build fix.

        * API/:
        * bindings/:
        * bytecode/:
        * bytecompiler/NodesCodegen.cpp:
        * debugger/:
        * dfg/:
        * heap/:
        * inspector/:
        * interpreter/:
        * jit/:
        * llint/LLIntEntrypoint.cpp:
        * parser/:
        * profiler/:
        * runtime/:
        Restore *Inlines.h includes for >300 files,
        but try to preserve the spirit of the original patch by pruning redundancies along the way.

2020-05-19  Mark Lam  <mark.lam@apple.com>

        Put PtrTagLookup data structures in Configs for freezing.
        https://bugs.webkit.org/show_bug.cgi?id=212089
        <rdar://problem/63401487>

        Reviewed by Robin Morisset.

        PtrTagLookup data structures were always meant to only be initialized once at
        initialization time and never modified thereafter.  This patch puts them in the
        Configs for freezing to document and enforce this invariant.

        * runtime/JSCConfig.h:
        * runtime/JSCPtrTag.cpp:
        (JSC::initializePtrTagLookup):

2020-05-19  Youenn Fablet  <youenn@apple.com>

        [ Mac wk1 Debug ] imported/w3c/web-platform-tests/fetch/api/basic/stream-safe-creation.any.html  is flaky crashing with alerts - WTFCrashWithInfo - SC::JSObject::get(JSC::JSGlobalObject*, JSC::PropertyName)
        https://bugs.webkit.org/show_bug.cgi?id=211923
        <rdar://problem/63244249>

        Reviewed by Mark Lam.

        * runtime/JSObject.h:
        (JSC::JSObject::get const):
        When calling get, a terminate exception might happen if running in workers.
        Return early in that case. Add an ASSERT that only terminated exceptions can actually happen.

2020-05-18  Andy Estes  <aestes@apple.com>

        http/tests/ssl/applepay/ApplePayInstallmentConfiguration.https.html fails in public SDK builds
        https://bugs.webkit.org/show_bug.cgi?id=212000
        <rdar://problem/63323082>

        Reviewed by Youenn Fablet.

        * Configurations/FeatureDefines.xcconfig:

2020-05-18  Saam Barati  <sbarati@apple.com>

        Do more speculation that a GetByVal/PutByVal will have an int32 index based on data from ArrayProfile
        https://bugs.webkit.org/show_bug.cgi?id=211877

        Reviewed by Yusuke Suzuki.

        Before this patch, when a GetByVal or PutByVal had a non int32 prediction for
        their incoming index, they'd fall completely off the fast path. However, there
        are programs where an int32 is boxed inside a double, but our notion of
        predicted types don't fully capture this fact. For example, if we have a double Add
        to produce an array index, that double Add will predict a full double result,
        not a SpecAnyIntAsDouble. However, for GetByVal and PutByVal, there is information
        from ArrayProfile we can use to determine if the incoming value is expected to
        be in int32 range. The heuristic this patch introduces is:
        
        isFullNumberSpeculation(indexSpeculation)
        && node->arrayMode().isSpecific()
        && node->arrayMode().isInBounds()
        && !m_graph.hasExitSite(node->origin.semantic, Overflow) // DoubleAsInt32 will exit with Overflow on failure
        
        If these conditions are met, we'll now emit a DoubleAsInt32 conversion node
        for the index. This puts along the fast path for GetByVal and PutByVal on
        array accesses where the incoming index is an int32 boxed in a double.
        
        To make the above isFullNumberSpeculation check more robust, this patch also
        makes it so non index double accesses result in marking the array profile as
        out of bounds. So this means indices greater than max safe index, and also,
        fractional doubles.
        
        
        This is a 3.75x speedup on microbenchmarks/get-and-put-by-val-double-index-dont-fall-off-a-cliff.js

        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * jit/JITOperations.cpp:
        (JSC::getByVal):

2020-05-18  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] BigInt peephole compare should speculate appropriately
        https://bugs.webkit.org/show_bug.cgi?id=212037
        <rdar://problem/63346966>

        Reviewed by Saam Barati.

        SpeculativeJIT::nonSpeculativePeepholeBranch missed BigInt speculation. This patch renames it
        to SpeculativeJIT::genericJSValuePeepholeBranch and adds speculation checks appropriately.

        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compilePeepHoleBranch):
        (JSC::DFG::SpeculativeJIT::genericJSValuePeepholeBranch):
        (JSC::DFG::SpeculativeJIT::nonSpeculativePeepholeBranch): Deleted.
        * dfg/DFGSpeculativeJIT.h:

2020-05-18  Keith Miller  <keith_miller@apple.com>

        OSR loop entry to iterator_next generic needs to CheckNotEmpty on m_next
        https://bugs.webkit.org/show_bug.cgi?id=212001

        Reviewed by Saam Barati.

        If we happen to OSR enter into iterator_next during a for-of loop
        that has only profiled a generic iterator but is actually running
        a fast iterator we will incorrectly perform the Call node This
        could happen if we loop_hint OSR enter the first time have seen a
        fast iterator. If this happens right now, we generate the following
        code:

        D@113:<!2:loc15>    GetLocal(Check:Untyped:D@198, JS|MustGen|UseAsOther, Function|Empty, loc13(W~/FlushedJSValue), machine:loc10, R:Stack(loc13),Stack(loc5), bc#46, ExitValid)  predicting Function|Empty
          0x4913f1806151: mov -0x58(%rbp), %rsi
        D@114:<!0:->    FilterCallLinkStatus(Check:Untyped:D@113, MustGen, (Function: Object: 0x1053f47e0 with butterfly 0x0 (Structure 0x1053f9260:[0x6dad, Function, {}, NonArray, Proto:0x1050fc248]), StructureID: 28077; Executable: next#Ddkruz:[0x1053c0480->0x1053e4a80, BaselineFunctionCall, 54 (StrictMode)]), R:Stack(loc5), W:SideState, bc#46, ExitValid)
        D@115:<!6:loc15>    Call(Check:Untyped:D@113, Check:Untyped:D@110, JS|MustGen|VarArgs|UseAsOther, Final, R:World,Stack(loc5), W:Heap, ExitsForExceptions, ClobbersExit, bc#46, ExitValid)  predicting Final
          0x4913f1806155: mov $0x1, 0x10(%rsp)
          0x4913f180615d: mov %rax, 0x18(%rsp)
          0x4913f1806162: mov %rsi, 0x8(%rsp)
          0x4913f1806167: mov %rax, -0xa0(%rbp)
          0x4913f180616e: mov $0x0, 0x24(%rbp)
          0x4913f1806175: mov $0x0, %r11
          0x4913f180617f: cmp %r11, %rsi
          0x4913f1806182: jnz 0x4913f1806192
          0x4913f1806188: call 0x4913f180618d
          0x4913f180618d: jmp 0x4913f18061ae
          0x4913f1806192: mov %rsi, %rax
          0x4913f1806195: mov $0x1050cfcb0, %rdx
          0x4913f180619f: mov $0x1052fab68, %rcx
          0x4913f18061a9: call 0x4913f1801680
          0x4913f18061ae: lea -0xd0(%rbp), %rsp
        D@116:<!0:->    MovHint(Check:Untyped:D@115, MustGen, tmp0, R:Stack(loc5), W:SideState, ClobbersExit, bc#46, ExitInvalid)
        D@332:<!0:->    InvalidationPoint(MustGen, R:Stack(loc5), W:SideState, Exits, bc#46, exit: bc#46cp#1, ExitValid)
        D@335:<!0:->    CheckStructure(Check:Cell:D@115, MustGen, [%B2:Object], R:Stack(loc5),JSCell_structureID, Exits, bc#46, exit: bc#46cp#1, ExitValid)
          0x4913f18061b5: test %rax, %r15
          0x4913f18061b8: jnz 0x4913f18068db
          0x4913f18061be: cmp $0xcaae, (%rax)
          0x4913f18061c4: jnz 0x4913f18068f1

        Loc13 in this IR is the location of the next function. Since it's
        nullptr, we will pass the initial fast-path value of 0 and make a
        garbage call. This is because Call does not know how to handle
        empty values. Subsequently, we will fail a structure check for the
        Call's result and OSR exit to the getDone checkpoint. The fix for
        this is to simply put a CheckNotEmpty at the top of the generic
        case. 99.9% of the time this check will be eliminated so it
        doesn't really cost anything.

        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::parseBlock):

2020-05-17  Yusuke Suzuki  <ysuzuki@apple.com>

        Unreviewed, link fix for our internal Debug build

        * heap/AlignedMemoryAllocator.cpp:

2020-05-17  Lauro Moura  <lmoura@igalia.com>

        [JSC] Silence unused-but-set-parameter warnings for older compilers
        https://bugs.webkit.org/show_bug.cgi?id=212006

        Reviewed by Mark Lam.

        GCC up to 9.x will emit unused-but-set-parameter for the sources
        parameter when NumberOfRegisters is zero (the if block is eliminated)
        and for destinations when also ASSERT_ENABLED is false.

        * jit/CCallHelpers.h:
        (JSC::CCallHelpers::setupStubArgs):

2020-05-16  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Make OutOfMemory error as instance of RangeError
        https://bugs.webkit.org/show_bug.cgi?id=211952

        Reviewed by Mark Lam.

        The spec sometimes requires "check parameters and throw RangeError" before allocating an object.
        But we are just allocating an object and throwing an out-of-memory error since wrong parameter will
        cause out-of-memory. If out-of-memory error is RangeError, then we can keep our current behavior while
        we can make us spec compliant. And note that out-of-memory error is RangeError in SpiderMonkey and V8.

        This patch makes out-of-memory error as RangeError instead of Error. We also fix @throwOutOfMemoryError
        in builtin code: the previous thrown errors are not marked as out-of-memory error.

        * bytecode/BytecodeList.rb:
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitThrowStaticError):
        (JSC::BytecodeGenerator::emitThrowReferenceError):
        (JSC::BytecodeGenerator::emitThrowTypeError):
        (JSC::BytecodeGenerator::emitThrowRangeError):
        (JSC::BytecodeGenerator::emitThrowOutOfMemoryError):
        * bytecompiler/BytecodeGenerator.h:
        * bytecompiler/NodesCodegen.cpp:
        (JSC::RegExpNode::emitBytecode):
        (JSC::BytecodeIntrinsicNode::emit_intrinsic_throwTypeError):
        (JSC::BytecodeIntrinsicNode::emit_intrinsic_throwRangeError):
        * dfg/DFGOperations.cpp:
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/Error.cpp:
        (JSC::createError):
        (JSC::createOutOfMemoryError):
        * runtime/Error.h:
        * runtime/ErrorType.cpp:
        (JSC::errorTypeName):
        (WTF::printInternal):
        * runtime/ErrorType.h: We introduced ErrorTypeWithExtension separately from ErrorType to keep ErrorType one-on-one to spec-specified error types.

2020-05-15  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] getFunctionRealm should not use recursion
        https://bugs.webkit.org/show_bug.cgi?id=211965
        <rdar://problem/63268287>

        Reviewed by Saam Barati.

        This patch avoids using recursion in getFunctionRealm to avoid stack-overflow.

        * runtime/InternalFunction.cpp:
        (JSC::getFunctionRealm):

2020-05-15  Keith Miller  <keith_miller@apple.com>

        Unreviewed, fix internal arm64e build.

        * dfg/DFGSpeculativeJIT.cpp:

2020-05-15  Keith Miller  <keith_miller@apple.com>

        Unreviewed, fix internal fast tls build.

        * jit/AssemblyHelpers.cpp:

2020-05-15  Ross Kirsling  <ross.kirsling@sony.com>

        [IWYU] Remove unnecessary includes from JSC implementation files
        https://bugs.webkit.org/show_bug.cgi?id=211867

        Reviewed by Keith Miller.

        * API/:
        * assembler/:
        * b3/:
        * bindings/:
        * builtins/BuiltinExecutables.cpp:
        * bytecode/:
        * bytecompiler/:
        * debugger/:
        * dfg/:
        * disassembler/:
        * ftl/:
        * heap/:
        * inspector/:
        * interpreter/:
        * jit/:
        * jsc.cpp:
        * llint/:
        * parser/:
        * profiler/:
        * runtime/:
        * testRegExp.cpp:
        * tools/:
        * wasm/:
        * yarr/:

2020-05-15  Michael Catanzaro  <mcatanzaro@gnome.org>

        -Wtype-limits warning spam from CCallHelpers.h
        https://bugs.webkit.org/show_bug.cgi?id=211701

        Reviewed by Darin Adler.

        Skip the problematic loops when TargetSize or NumberOfRegisters is 0 using constexpr if.
        Solution suggested by Mark Lam.

        * jit/CCallHelpers.h:
        (JSC::CCallHelpers::setupStubArgs):
        (JSC::CCallHelpers::clampArrayToSize):

2020-05-15  Mark Lam  <mark.lam@apple.com>

        Remove debugging dataLogs in LinkBuffer::copyCompactAndLinkCode() for release builds.
        https://bugs.webkit.org/show_bug.cgi?id=211961
        <rdar://problem/63264848>

        Reviewed by Keith Miller.

        * assembler/LinkBuffer.cpp:
        (JSC::LinkBuffer::copyCompactAndLinkCode):

2020-05-15  Paulo Matos  <pmatos@igalia.com>

        Fix ARM NEON only assert
        https://bugs.webkit.org/show_bug.cgi?id=211889

        Reviewed by Mark Lam.

        Fix assert that breaks if ARM does not contain NEON extensions -
        the register d16 is only defined if NEON exists.

        * assembler/ARMv7Assembler.h:
        (JSC::RegisterNames::asSingle):
        (JSC::RegisterNames::asSingleUpper):

2020-05-14  Saam Barati  <sbarati@apple.com>

        GetByVal and PutByVal runtime operations shouldn't fall off a performance cliff when the property is an integer boxed as a double
        https://bugs.webkit.org/show_bug.cgi?id=211935

        Reviewed by Yusuke Suzuki and Mark Lam.

        There were parts in the runtime for get_by_val that weren't properly handling
        ints boxed as doubles along the fast path. This could lead to terrible
        performance as we could go from double -> string -> int while converting the
        subscript into a property to access.
        
        This patch fixes that, and removes the duplicate code we had throughout the
        codebase that does this conversion. I'm adding a new functions tryGetAsUint32Index
        and tryGetAsInt32 which will handle the double to int conversion.
        
        This is a 10x speedup on the microbenchmark get-and-put-by-val-double-index-dont-fall-off-a-cliff.js

        * dfg/DFGOperations.cpp:
        (JSC::DFG::putByValInternal):
        * jit/JITOperations.cpp:
        (JSC::getByVal):
        * jsc.cpp:
        (functionAsDoubleNumber):
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::getByVal):
        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
        * runtime/JSCJSValue.h:
        * runtime/JSCJSValueInlines.h:
        (JSC::JSValue::tryGetAsUint32Index):
        (JSC::JSValue::tryGetAsInt32):

2020-05-14  Devin Rousso  <drousso@apple.com>

        [ESNext] enable logical assignment operators by default
        https://bugs.webkit.org/show_bug.cgi?id=211921

        Reviewed by Yusuke Suzuki.

        * runtime/OptionsList.h:
        * parser/Lexer.cpp:
        (JSC::Lexer<T>::lexWithoutClearingLineTerminator):
        Remove `useLogicalAssignmentOperators` option.

2020-05-14  Keith Miller  <keith_miller@apple.com>

        Undecided Arrays shouldn't need to be OriginalArray to covert to GetArrayLength
        https://bugs.webkit.org/show_bug.cgi?id=211914

        Reviewed by Saam Barati.

        Also, fix a bug that arrayModesThatPassFiltering() can't handle
        Undecided arrays. Because we can now emit a CheckArray on
        Undecided AI will try to figure out what types flow out of the
        check. Since Undecided was unhandled by filtering, AI will assume
        bottom is the only possible value and the DFG/FTL will insert a
        breakpoint, causing a crash.

        * dfg/DFGArrayMode.cpp:
        (JSC::DFG::ArrayMode::refine const):
        * dfg/DFGArrayMode.h:
        (JSC::DFG::ArrayMode::arrayModesThatPassFiltering const):

2020-05-14  Keith Miller  <keith_miller@apple.com>

        GetArrayLength should be "blessed" during Fixup phase in the DFG
        https://bugs.webkit.org/show_bug.cgi?id=211540

        Reviewed by Saam Barati.

        If we got an ArrayMode during bytecode parsing for-of that expects
        to be configured during Fixup, then right now we will crash on
        GetArrayLength. This fixes GetArrayLength to properly call
        blessArrayOperation and fixes clobberize to know that
        GetArrayLength could have a ForceExit ArrayMode briefly before
        being cleaned up.

        When blessing GetArrayLength we can now produce CheckArrays that
        have an AnyTypedArray ArrayMode::Type. So this patch expands
        CheckArray to properly handle that. To help with this we expand
        branchIfType to have a starting JSType and an optional ending
        JSType. Additionally, to prevent extra checks AI has been taught
        to fold more ArrayModes so we should almost always avoid new
        runtime checks.

        Lastly, make sure that Undecided Arrays don't fall back to generic
        because GetArrayLength can't be converted to...
        GetArrayLenth. Also, GetArrayLength would previously pass it's own
        speculation for the speculation of the index, which logically
        doesn't make sense. So this patch adds a new constant, which is
        SpecInt32Only, that can be passed if a DFG node doesn't have an
        index.

        * assembler/testmasm.cpp:
        (JSC::testBranchIfType):
        (JSC::testBranchIfNotType):
        (JSC::run):
        * dfg/DFGArrayMode.cpp:
        (JSC::DFG::canBecomeGetArrayLength):
        * dfg/DFGArrayMode.h:
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        (JSC::DFG::FixupPhase::blessArrayOperation):
        (JSC::DFG::FixupPhase::attemptToMakeGetArrayLength):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::checkArray):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::isArrayTypeForCheckArray):
        * jit/AssemblyHelpers.h:
        (JSC::AssemblyHelpers::branchIfType):
        (JSC::AssemblyHelpers::branchIfNotType):
        * runtime/JSType.h:

2020-05-13  Keith Miller  <keith_miller@apple.com>

        iteration bytecodes need to handle osr exiting from inlined getter frames
        https://bugs.webkit.org/show_bug.cgi?id=211873

        Reviewed by Saam Barati.

        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::slow_path_checkpoint_osr_exit_from_inlined_call):

2020-05-13  Devin Rousso  <drousso@apple.com>

        Web Inspector: rename CSS.StyleSheetOrigin.Regular to CSS.StyleSheetOrigin.Author to match the spec
        https://bugs.webkit.org/show_bug.cgi?id=211827

        Reviewed by Timothy Hatcher.

        * inspector/protocol/CSS.json:

2020-05-13  Yusuke Suzuki  <ysuzuki@apple.com>

        JSDOMWindowBase m_windowCloseWatchpoints must be Ref<>
        https://bugs.webkit.org/show_bug.cgi?id=211844

        Reviewed by Mark Lam.

        * bytecode/Watchpoint.cpp:
        (JSC::InlineWatchpointSet::inflateSlow):
        * bytecode/Watchpoint.h:
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::JSGlobalObject):
        * runtime/Structure.cpp:
        (JSC::Structure::ensurePropertyReplacementWatchpointSet):
        * runtime/SymbolTable.cpp:
        (JSC::SymbolTableEntry::prepareToWatch):
        * runtime/VM.cpp:
        (JSC::VM::ensureWatchpointSetForImpureProperty):

2020-05-13  Caio Lima  <ticaiolima@gmail.com>

        Making 32-bits JIT build without Unified Build system
        https://bugs.webkit.org/show_bug.cgi?id=211853

        Reviewed by Adrian Perez de Castro.

        This patch is moving some templates to allow non-unified builds on
        32-bits JIT configurations.
        Those templates were from JITArithmetic32_64 and JITPropertyAccess32_64.

        * jit/JITArithmetic.cpp:
        (JSC::JIT::emit_compareAndJump):
        (JSC::JIT::emit_compareUnsignedAndJump):
        (JSC::JIT::emit_compareUnsigned):
        (JSC::JIT::emit_compareAndJumpSlow):
        (JSC::JIT::emitBinaryDoubleOp):
        * jit/JITArithmetic32_64.cpp:
        (JSC::JIT::emit_compareAndJump): Deleted.
        (JSC::JIT::emit_compareUnsignedAndJump): Deleted.
        (JSC::JIT::emit_compareUnsigned): Deleted.
        (JSC::JIT::emit_compareAndJumpSlow): Deleted.
        (JSC::JIT::emitBinaryDoubleOp): Deleted.
        * jit/JITOpcodes32_64.cpp:
        * jit/JITPropertyAccess.cpp:
        (JSC::JIT::emitPutByValWithCachedId):
        * jit/JITPropertyAccess32_64.cpp:
        (JSC::JIT::emitPutByValWithCachedId): Deleted.

2020-05-13  Caio Lima  <ticaiolima@gmail.com>

        [JSC] Support delete by val/id IC on 32-bits
        https://bugs.webkit.org/show_bug.cgi?id=208207

        Reviewed by Saam Barati.

        This patch implements DeleteById and DeleteByVal IC on 32-bits JIT. It
        includes both Baseline and DFG changes.

        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileDeleteById):
        (JSC::DFG::SpeculativeJIT::compileDeleteByVal):
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compileDeleteById): Deleted.
        (JSC::DFG::SpeculativeJIT::compileDeleteByVal): Deleted.
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compileDeleteById): Deleted.
        (JSC::DFG::SpeculativeJIT::compileDeleteByVal): Deleted.
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileDelBy):
        * jit/JITInlineCacheGenerator.cpp:
        (JSC::JITDelByValGenerator::JITDelByValGenerator):
        (JSC::JITDelByIdGenerator::JITDelByIdGenerator):
        * jit/JITInlineCacheGenerator.h:
        * jit/JITPropertyAccess.cpp:
        (JSC::JIT::emit_op_del_by_id):
        (JSC::JIT::emit_op_del_by_val):
        * jit/JITPropertyAccess32_64.cpp:
        (JSC::JIT::emit_op_del_by_id):
        (JSC::JIT::emit_op_del_by_val):
        (JSC::JIT::emitSlow_op_del_by_val):
        (JSC::JIT::emitSlow_op_del_by_id):

2020-05-13  Saam Barati  <sbarati@apple.com>

        MovHint can see an arguments object be MovHinted to a Tmp
        https://bugs.webkit.org/show_bug.cgi?id=211820
        <rdar://problem/62882158>

        Reviewed by Keith Miller.

        We had an assert that it wasn't possible to have a MovHint from an arguments
        object to a Tmp. However, this is possible with for-of. There is nothing
        about the current algorithm that is specific to only VirtualRegisters. The
        algorithm also works over Tmps. So I've generalized the algorithm to just work
        over Operand.

        * dfg/DFGVarargsForwardingPhase.cpp:

2020-05-13  Alexey Shvayka  <shvaikalesh@gmail.com>

        Move @isConstructor checks from fast paths of Array.from and Array.of
        https://bugs.webkit.org/show_bug.cgi?id=211805

        Reviewed by Keith Miller.

        This semantically equivalent change advances provided Array.{from,of} microbenchmarks by ~60%. 

        Also, this patch removes @isConstructor check from @newPromiseCapabilitySlow (that is heavily
        used by Promise subclasses) since it comes right before [[Construct]], its message doesn't add
        more clarity, and constructability of its argument was likely checked by @speciesConstructor.

        * builtins/ArrayConstructor.js:
        (of):
        (from):
        * builtins/PromiseOperations.js:
        (globalPrivate.newPromiseCapabilitySlow):

2020-05-12  Alexey Shvayka  <shvaikalesh@gmail.com>

        Implement @isConstructor bytecode intrinsic and bytecode for that
        https://bugs.webkit.org/show_bug.cgi?id=144093

        Reviewed by Keith Miller.

        This change replaces @isConstructor link-time-constant with bytecode intrinsic and utilizes it
        in ClassExprNode::emitBytecode() according to the spec [1], aligning JSC with V8 and SpiderMonkey.

        Before this patch, we checked if "prototype" of superclass is an object, which is incorrect for
        generators and bound non-constructor functions with own "prototype".

        OpIsConstructor's fast path can't be easily compiled, and it's not a hot code anyway, so instead
        we reduce code bloat by just calling slow ops from DFG and FTL (if we bail out, we slow down all
        @isConstructor call sites). This advances microbenchmarks/is-constructor.js by ~35%.

        [1]: https://tc39.es/ecma262/#sec-runtime-semantics-classdefinitionevaluation (step 5.f)

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * Sources.txt:
        * builtins/BuiltinNames.h:
        * bytecode/BytecodeIntrinsicRegistry.h:
        * bytecode/BytecodeList.rb:
        * bytecode/BytecodeUseDef.cpp:
        (JSC::computeUsesForBytecodeIndexImpl):
        (JSC::computeDefsForBytecodeIndexImpl):
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitIsConstructor):
        * bytecompiler/BytecodeGenerator.h:
        * bytecompiler/NodesCodegen.cpp:
        (JSC::ClassExprNode::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/DFGNodeType.h:
        * dfg/DFGOperations.cpp:
        * dfg/DFGOperations.h:
        * dfg/DFGPredictionPropagationPhase.cpp:
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileIsConstructor):
        * dfg/DFGSpeculativeJIT.h:
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileNode):
        (JSC::FTL::DFG::LowerDFGToB3::compileIsConstructor):
        * jit/JIT.cpp:
        (JSC::JIT::privateCompileMainPass):
        * llint/LowLevelInterpreter.asm:
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/CommonSlowPaths.h:
        * runtime/ECMAScriptSpecInternalFunctions.cpp: Removed.
        * runtime/ECMAScriptSpecInternalFunctions.h: Removed.
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):

2020-05-12  Robin Morisset  <rmorisset@apple.com>

        Exception check for OOM is a bit too late in JSBigInt::exponentiate.
        https://bugs.webkit.org/show_bug.cgi?id=211823

        Reviewed by Mark Lam.

        We were doing multiplyImpl(...).payload.asHeapBigInt(), but multiplyImpl can return a null payload if it causes an exception.
        So we must first check whether an exception was raised, and only if not can we do asHeapBigInt.

        * runtime/JSBigInt.cpp:
        (JSC::JSBigInt::exponentiateImpl):

2020-05-12  Saam Barati  <sbarati@apple.com>

        handling of Check in VarargsForwardingPhase is too pessimistic
        https://bugs.webkit.org/show_bug.cgi?id=211810

        Reviewed by Keith Miller and Filip Pizlo.

        We were treating a check, even if it wasn't on the sink candidate,
        as if it could escape the candidate. That's wrong. Only checks on the
        candidate have the escaping ability.

        * dfg/DFGVarargsForwardingPhase.cpp:

2020-05-12  Keith Miller  <keith_miller@apple.com>

        The bottom value set for m_value in iterator_next should be materialized after a done getter
        https://bugs.webkit.org/show_bug.cgi?id=211811

        Reviewed by Saam Barati.

        Right now, if the done getter contains control flow, then we will
        have the bottom value in a different block from the
        MovHint/SetLocal and we will fail to validate.

        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::parseBlock):

2020-05-12  Ross Kirsling  <ross.kirsling@sony.com>

        Fix existing usage of final/override/virtual in JSC and WTF
        https://bugs.webkit.org/show_bug.cgi?id=211772

        Reviewed by Darin Adler.

        * API/JSAPIWrapperObject.mm:
        * API/JSManagedValue.mm:
        * API/JSScriptSourceProvider.h:
        * API/ObjCCallbackFunction.mm:
        * API/glib/JSAPIWrapperGlobalObject.cpp:
        * API/glib/JSAPIWrapperObjectGLib.cpp:
        * API/glib/JSCWeakValue.cpp:
        * bytecode/AccessCaseSnippetParams.cpp:
        * bytecode/AccessCaseSnippetParams.h:
        * bytecode/CodeBlock.cpp:
        * bytecode/StructureStubClearingWatchpoint.h:
        * bytecode/VariableWriteFireDetail.h:
        * bytecode/Watchpoint.h:
        * dfg/DFGAdaptiveInferredPropertyValueWatchpoint.h:
        * dfg/DFGArrayifySlowPathGenerator.h:
        * dfg/DFGCallArrayAllocatorSlowPathGenerator.h:
        * dfg/DFGCallCreateDirectArgumentsSlowPathGenerator.h:
        * dfg/DFGSaneStringGetByValSlowPathGenerator.h:
        * dfg/DFGSlowPathGenerator.h:
        * dfg/DFGSnippetParams.h:
        * dfg/DFGWorklist.cpp:
        * ftl/FTLSnippetParams.h:
        * heap/BlockDirectory.cpp:
        * heap/EdenGCActivityCallback.h:
        * heap/FullGCActivityCallback.h:
        * heap/Heap.cpp:
        * heap/Heap.h:
        * heap/IncrementalSweeper.h:
        * heap/IsoCellSet.cpp:
        * heap/IsoCellSetInlines.h:
        * heap/IsoHeapCellType.h:
        * heap/IsoInlinedHeapCellType.h:
        * heap/ParallelSourceAdapter.h:
        * heap/StopIfNecessaryTimer.h:
        * heap/Subspace.cpp:
        * heap/SubspaceInlines.h:
        * inspector/InjectedScript.h:
        * inspector/JSGlobalObjectConsoleClient.h:
        * inspector/JSGlobalObjectInspectorController.h:
        * inspector/JSGlobalObjectScriptDebugServer.h:
        * inspector/JSInjectedScriptHost.cpp:
        * inspector/agents/InspectorAgent.h:
        * inspector/agents/InspectorScriptProfilerAgent.h:
        * inspector/agents/InspectorTargetAgent.h:
        * inspector/agents/JSGlobalObjectAuditAgent.h:
        * inspector/agents/JSGlobalObjectDebuggerAgent.h:
        * inspector/agents/JSGlobalObjectRuntimeAgent.h:
        * inspector/augmentable/AlternateDispatchableAgent.h:
        * inspector/remote/RemoteConnectionToTarget.h:
        * inspector/remote/RemoteInspector.h:
        * inspector/remote/socket/RemoteInspectorServer.h:
        * inspector/scripts/codegen/cpp_generator_templates.py:
        * inspector/scripts/codegen/generate_objc_backend_dispatcher_header.py:
        * inspector/scripts/tests/all/expected/definitions-with-mac-platform.json-result:
        * inspector/scripts/tests/generic/expected/command-targetType-matching-domain-debuggableType.json-result:
        * inspector/scripts/tests/generic/expected/commands-with-async-attribute.json-result:
        * inspector/scripts/tests/generic/expected/commands-with-optional-call-return-parameters.json-result:
        * inspector/scripts/tests/generic/expected/domain-debuggableTypes.json-result:
        * inspector/scripts/tests/generic/expected/domain-targetType-matching-domain-debuggableType.json-result:
        * inspector/scripts/tests/generic/expected/domain-targetTypes.json-result:
        * inspector/scripts/tests/generic/expected/domains-with-varying-command-sizes.json-result:
        * inspector/scripts/tests/generic/expected/enum-values.json-result:
        * inspector/scripts/tests/generic/expected/event-targetType-matching-domain-debuggableType.json-result:
        * inspector/scripts/tests/generic/expected/generate-domains-with-feature-guards.json-result:
        * inspector/scripts/tests/mac/expected/definitions-with-mac-platform.json-result:
        * jit/JITWorklist.cpp:
        * parser/Nodes.h:
        * parser/SourceProvider.h:
        * runtime/DataView.h:
        * runtime/DoublePredictionFuzzerAgent.h:
        * runtime/FileBasedFuzzerAgent.h:
        * runtime/GenericTypedArrayView.h:
        * runtime/JSMicrotask.cpp:
        * runtime/NarrowingNumberPredictionFuzzerAgent.h:
        * runtime/ObjectPropertyChangeAdaptiveWatchpoint.h:
        * runtime/PredictionFileCreatingFuzzerAgent.h:
        * runtime/PromiseTimer.h:
        * runtime/RandomizingFuzzerAgent.h:
        * runtime/RegExpCache.h:
        * runtime/Structure.cpp:
        * runtime/StructureRareData.cpp:
        * runtime/VMTraps.cpp:
        * runtime/WideningNumberPredictionFuzzerAgent.h:
        * tools/JSDollarVM.cpp:
        * wasm/WasmBBQPlan.h:
        * wasm/WasmCallee.h:
        * wasm/WasmLLIntPlan.h:
        * wasm/WasmOMGForOSREntryPlan.h:
        * wasm/WasmOMGPlan.h:
        * wasm/WasmWorklist.cpp:
        * yarr/YarrJIT.cpp:

2020-05-12  Ross Kirsling  <ross.kirsling@sony.com>

        [clang-tidy] Run modernize-use-override over JSC, then ensure as much as possible is final
        https://bugs.webkit.org/show_bug.cgi?id=211743

        Reviewed by Saam Barati.

        * API/JSScriptRef.cpp:
        * b3/B3ArgumentRegValue.h:
        * b3/B3AtomicValue.h:
        * b3/B3CCallValue.h:
        * b3/B3CheckSpecial.h:
        * b3/B3CheckValue.h:
        * b3/B3Const32Value.h:
        * b3/B3Const64Value.h:
        * b3/B3ConstDoubleValue.h:
        * b3/B3ConstFloatValue.h:
        * b3/B3DataSection.h:
        * b3/B3ExtractValue.h:
        * b3/B3FenceValue.h:
        * b3/B3MemoryValue.h:
        * b3/B3PatchpointSpecial.h:
        * b3/B3PatchpointValue.h:
        * b3/B3SlotBaseValue.h:
        * b3/B3StackmapSpecial.h:
        * b3/B3StackmapValue.h:
        * b3/B3SwitchValue.h:
        * b3/B3UpsilonValue.h:
        * b3/B3VariableValue.h:
        * b3/B3WasmAddressValue.h:
        * b3/B3WasmBoundsCheckValue.h:
        * b3/air/AirCCallSpecial.h:
        * b3/air/AirPrintSpecial.h:
        * bytecode/BytecodeDumper.h:
        * bytecode/GetterSetterAccessCase.h:
        * bytecode/InstanceOfAccessCase.h:
        * bytecode/IntrinsicGetterAccessCase.h:
        * bytecode/ModuleNamespaceAccessCase.h:
        * bytecode/ProxyableAccessCase.h:
        * bytecode/Watchpoint.h:
        * dfg/DFGFailedFinalizer.h:
        * dfg/DFGGraph.h:
        * dfg/DFGJITCode.h:
        * dfg/DFGJITFinalizer.h:
        * dfg/DFGToFTLDeferredCompilationCallback.h:
        * dfg/DFGToFTLForOSREntryDeferredCompilationCallback.h:
        * ftl/FTLForOSREntryJITCode.h:
        * ftl/FTLJITCode.h:
        * ftl/FTLJITFinalizer.h:
        * heap/CompleteSubspace.h:
        * heap/FastMallocAlignedMemoryAllocator.h:
        * heap/GigacageAlignedMemoryAllocator.h:
        * heap/HeapSnapshotBuilder.h:
        * heap/IsoAlignedMemoryAllocator.h:
        * heap/IsoSubspace.h:
        * heap/IsoSubspacePerVM.cpp:
        * heap/IsoSubspacePerVM.h:
        * heap/MarkStackMergingConstraint.h:
        * heap/SimpleMarkingConstraint.h:
        * heap/SpaceTimeMutatorScheduler.h:
        * heap/StochasticSpaceTimeMutatorScheduler.h:
        * heap/SynchronousStopTheWorldMutatorScheduler.h:
        * jit/GCAwareJITStubRoutine.h:
        * jit/JITCode.h:
        * jit/JITThunks.h:
        * jit/JITToDFGDeferredCompilationCallback.h:
        * jit/PolymorphicCallStubRoutine.h:
        * jsc.cpp:
        * parser/Lexer.cpp: Address warning.
        * runtime/JSDestructibleObjectHeapCellType.h:
        * runtime/SimpleTypedArrayController.h:
        * runtime/Structure.h:
        * runtime/WeakGCMap.h:
        * wasm/WasmEntryPlan.h:

2020-05-12  Michael Catanzaro  <mcatanzaro@gnome.org>

        -Wsign-compare warnings in FTLLowerDFGToB3.cpp and DFGSpeculativeJIT.cpp
        https://bugs.webkit.org/show_bug.cgi?id=211783

        Reviewed by Darin Adler.

        This fixes -Wsign-compare warnings introduced in r260331.

        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileValueBitNot):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileValueBitNot):

2020-05-12  Truitt Savell  <tsavell@apple.com>

        Unreviewed, reverting r261542.

        Broke internal builds

        Reverted changeset:

        "[clang-tidy] Run modernize-use-override over JSC, then ensure
        as much as possible is final"
        https://bugs.webkit.org/show_bug.cgi?id=211743
        https://trac.webkit.org/changeset/261542

2020-05-12  Mark Lam  <mark.lam@apple.com>

        Wasm::enableFastMemory() was called too late.
        https://bugs.webkit.org/show_bug.cgi?id=211773

        Reviewed by Yusuke Suzuki.

        If Wasm fast memory is to be enabled, we should just do it in initializeThreading()
        just like for all the other signal handlers that need to be initialized for JSC.
        This simplifies its initialization and ensures that it is done in a timely manner
        before Configs are frozen.

        * jsc.cpp:
        (jscmain):
        * runtime/InitializeThreading.cpp:
        (JSC::initializeThreading):

2020-05-11  Darin Adler  <darin@apple.com>

        Fix problems caught by replacing WTF::Optional with std::optional
        https://bugs.webkit.org/show_bug.cgi?id=211703

        Reviewed by Chris Dumez.

        * runtime/MachineContext.h:
        (JSC::MachineContext::instructionPointer): Use explcit makeOptional here,
        to work around the fact that MacroAssemblerCodePtr uses an unusual technique
        to disable conversions to everything except bool.

2020-05-11  Yoshiaki JITSUKAWA  <yoshiaki.jitsukawa@sony.com>

        Fix build errors after r260992
        https://bugs.webkit.org/show_bug.cgi?id=211756

        Reviewed by Darin Adler.

        Add JSC namespace specifier to NonIntrinsic and PropertyAttribute
        in the macros in JSObject.h since those can be used outside of
        or without introducing JSC namespace. 
        * runtime/JSObject.h:

2020-05-11  Ross Kirsling  <ross.kirsling@sony.com>

        [clang-tidy] Run modernize-use-override over JSC, then ensure as much as possible is final
        https://bugs.webkit.org/show_bug.cgi?id=211743

        Reviewed by Saam Barati.

        * API/JSScriptRef.cpp:
        * b3/B3ArgumentRegValue.h:
        * b3/B3AtomicValue.h:
        * b3/B3CCallValue.h:
        * b3/B3CheckSpecial.h:
        * b3/B3CheckValue.h:
        * b3/B3Const32Value.h:
        * b3/B3Const64Value.h:
        * b3/B3ConstDoubleValue.h:
        * b3/B3ConstFloatValue.h:
        * b3/B3DataSection.h:
        * b3/B3ExtractValue.h:
        * b3/B3FenceValue.h:
        * b3/B3MemoryValue.h:
        * b3/B3PatchpointSpecial.h:
        * b3/B3PatchpointValue.h:
        * b3/B3SlotBaseValue.h:
        * b3/B3StackmapSpecial.h:
        * b3/B3StackmapValue.h:
        * b3/B3SwitchValue.h:
        * b3/B3UpsilonValue.h:
        * b3/B3VariableValue.h:
        * b3/B3WasmAddressValue.h:
        * b3/B3WasmBoundsCheckValue.h:
        * b3/air/AirCCallSpecial.h:
        * b3/air/AirPrintSpecial.h:
        * bytecode/BytecodeDumper.h:
        * bytecode/GetterSetterAccessCase.h:
        * bytecode/InstanceOfAccessCase.h:
        * bytecode/IntrinsicGetterAccessCase.h:
        * bytecode/ModuleNamespaceAccessCase.h:
        * bytecode/ProxyableAccessCase.h:
        * bytecode/Watchpoint.h:
        * dfg/DFGFailedFinalizer.h:
        * dfg/DFGGraph.h:
        * dfg/DFGJITCode.h:
        * dfg/DFGJITFinalizer.h:
        * dfg/DFGToFTLDeferredCompilationCallback.h:
        * dfg/DFGToFTLForOSREntryDeferredCompilationCallback.h:
        * ftl/FTLForOSREntryJITCode.h:
        * ftl/FTLJITCode.h:
        * ftl/FTLJITFinalizer.h:
        * heap/CompleteSubspace.h:
        * heap/FastMallocAlignedMemoryAllocator.h:
        * heap/GigacageAlignedMemoryAllocator.h:
        * heap/HeapSnapshotBuilder.h:
        * heap/IsoAlignedMemoryAllocator.h:
        * heap/IsoSubspace.h:
        * heap/IsoSubspacePerVM.cpp:
        * heap/IsoSubspacePerVM.h:
        * heap/MarkStackMergingConstraint.h:
        * heap/SimpleMarkingConstraint.h:
        * heap/SpaceTimeMutatorScheduler.h:
        * heap/StochasticSpaceTimeMutatorScheduler.h:
        * heap/SynchronousStopTheWorldMutatorScheduler.h:
        * jit/GCAwareJITStubRoutine.h:
        * jit/JITCode.h:
        * jit/JITThunks.h:
        * jit/JITToDFGDeferredCompilationCallback.h:
        * jit/PolymorphicCallStubRoutine.h:
        * jsc.cpp:
        * parser/Lexer.cpp: Address warning.
        * runtime/JSDestructibleObjectHeapCellType.h:
        * runtime/SimpleTypedArrayController.h:
        * runtime/Structure.h:
        * runtime/WeakGCMap.h:
        * wasm/WasmEntryPlan.h:

2020-05-11  Mark Lam  <mark.lam@apple.com>

        Introduce WTF::Config and put Signal.cpp's init-once globals in it.
        https://bugs.webkit.org/show_bug.cgi?id=211729
        <rdar://problem/62938878>

        Reviewed by Keith Miller and Saam Barati.

        1. Initialize VMTraps' signals early now that we'll be freezing signals at the end
           of the first VM initialization.

        2. Move the !initializeThreadingHasBeenCalled RELEASE_ASSERT in initializeThreading()
           to the bottom of the function.  This way, we'll also catch bugs which may cause
           us to jump into the middle of the function.

           Added a compilerFence there to ensure that the RELEASE_ASSERT is only executed
           after all initialization is done.  This guarantees that it will only be executed
           at the end.

        3. Call WTF::Config::permanentlyFreeze() from JSC::Config::permanentlyFreeze()
           for obvious reasons: freezing one should freeze the other.

        * runtime/InitializeThreading.cpp:
        (JSC::initializeThreading):
        * runtime/JSCConfig.cpp:
        (JSC::Config::permanentlyFreeze):
        * runtime/VMTraps.cpp:
        (JSC::VMTraps::initializeSignals):
        * runtime/VMTraps.h:

2020-05-11  Keith Miller  <keith_miller@apple.com>

        Remove unused BytecodeKills.h
        https://bugs.webkit.org/show_bug.cgi?id=211753

        Reviewed by Yusuke Suzuki.

        No one uses this class anymore, we should get rid of it.

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * bytecode/BytecodeKills.h: Removed.
        * bytecode/BytecodeLivenessAnalysis.cpp:
        (JSC::BytecodeLivenessAnalysis::computeKills): Deleted.
        * bytecode/BytecodeLivenessAnalysis.h:
        * dfg/DFGGraph.cpp:
        (JSC::DFG::Graph::killsFor): Deleted.
        * dfg/DFGGraph.h:

2020-05-10  Ross Kirsling  <ross.kirsling@sony.com>

        [clang-tidy] Run modernize-use-nullptr over JSC
        https://bugs.webkit.org/show_bug.cgi?id=211706

        Reviewed by Darin Adler.

        * API/APICallbackFunction.h:
        * API/JSAPIGlobalObject.h:
        * API/JSBase.cpp:
        * API/JSCallbackObjectFunctions.h:
        * API/JSClassRef.cpp:
        * API/JSContextRef.cpp:
        * API/JSObjectRef.cpp:
        * API/JSScriptRef.cpp:
        * API/JSValueRef.cpp:
        * API/JSWeakObjectMapRefPrivate.cpp:
        * API/tests/ExecutionTimeLimitTest.cpp:
        * API/tests/PingPongStackOverflowTest.cpp:
        * assembler/AbstractMacroAssembler.h:
        * assembler/CPU.cpp:
        * bytecode/CodeBlock.cpp:
        * bytecode/DeleteByIdVariant.cpp:
        * bytecode/GetByIdVariant.cpp:
        * bytecode/InByIdVariant.cpp:
        * bytecode/InlineCallFrame.cpp:
        * bytecode/LazyOperandValueProfile.cpp:
        * bytecode/PutByIdVariant.cpp:
        * bytecode/ValueProfile.h:
        * bytecode/ValueRecovery.cpp:
        * bytecompiler/BytecodeGenerator.h:
        * bytecompiler/NodesCodegen.cpp:
        * debugger/DebuggerScope.h:
        * dfg/DFGAbstractValue.cpp:
        * dfg/DFGAdjacencyList.h:
        * dfg/DFGArgumentPosition.h:
        * dfg/DFGArrayifySlowPathGenerator.h:
        * dfg/DFGAvailability.h:
        * dfg/DFGByteCodeParser.cpp:
        * dfg/DFGCFGSimplificationPhase.cpp:
        * dfg/DFGCPSRethreadingPhase.cpp:
        * dfg/DFGCompilationKey.h:
        * dfg/DFGConstantFoldingPhase.cpp:
        * dfg/DFGDisassembler.cpp:
        * dfg/DFGDoubleFormatState.h:
        * dfg/DFGEdge.h:
        * dfg/DFGFixupPhase.cpp:
        * dfg/DFGFrozenValue.cpp:
        * dfg/DFGGenerationInfo.h:
        * dfg/DFGGraph.h:
        * dfg/DFGInPlaceAbstractState.cpp:
        * dfg/DFGIntegerCheckCombiningPhase.cpp:
        * dfg/DFGLazyJSValue.cpp:
        * dfg/DFGNode.h:
        * dfg/DFGOSREntrypointCreationPhase.cpp:
        * dfg/DFGOSRExit.cpp:
        * dfg/DFGOperations.cpp:
        * dfg/DFGSilentRegisterSavePlan.h:
        * dfg/DFGSpeculativeJIT.cpp:
        * dfg/DFGSpeculativeJIT.h:
        * dfg/DFGSpeculativeJIT64.cpp:
        * dfg/DFGStructureAbstractValue.cpp:
        * dfg/DFGTransition.cpp:
        * dfg/DFGTypeCheckHoistingPhase.cpp:
        * dfg/DFGWorklist.cpp:
        * ftl/FTLAbstractHeapRepository.h:
        * ftl/FTLAvailableRecovery.h:
        * ftl/FTLExitValue.cpp:
        * ftl/FTLFormattedValue.h:
        * ftl/FTLJITCode.cpp:
        * ftl/FTLLink.cpp:
        * ftl/FTLLowerDFGToB3.cpp:
        * ftl/FTLLoweredNodeValue.h:
        * ftl/FTLOSREntry.cpp:
        * ftl/FTLOSRExitCompiler.cpp:
        * ftl/FTLTypedPointer.h:
        * ftl/FTLValueFromBlock.h:
        * ftl/FTLValueRange.h:
        * heap/GCSegmentedArray.h:
        * heap/Handle.h:
        * heap/HandleSet.h:
        * heap/HandleTypes.h:
        * heap/HeapSnapshotBuilder.cpp:
        * heap/MarkedBlockInlines.h:
        * heap/Strong.h:
        * heap/WeakImpl.h:
        * heap/WeakInlines.h:
        * heap/WeakSet.cpp:
        * heap/WeakSet.h:
        * interpreter/CallFrame.cpp:
        * interpreter/CallFrame.h:
        * interpreter/Interpreter.cpp:
        * interpreter/ProtoCallFrame.h:
        * interpreter/StackVisitor.cpp:
        * interpreter/StackVisitor.h:
        * jit/AssemblyHelpers.h:
        * jit/CCallHelpers.h:
        * jit/JITCode.cpp:
        * jit/JITOperations.cpp:
        * jit/Repatch.cpp:
        * jit/ThunkGenerators.cpp:
        * jsc.cpp:
        * llint/LLIntSlowPaths.cpp:
        * parser/ASTBuilder.h:
        * parser/Lexer.cpp:
        * parser/Lexer.h:
        * parser/Nodes.cpp:
        * parser/Nodes.h:
        * parser/Parser.cpp:
        * parser/Parser.h:
        * parser/ParserArena.cpp:
        * parser/ParserArena.h:
        * parser/ParserFunctionInfo.h:
        * parser/SyntaxChecker.h:
        * parser/UnlinkedSourceCode.h:
        * profiler/ProfilerBytecodeSequence.cpp:
        * profiler/ProfilerCompilation.cpp:
        * profiler/ProfilerDatabase.cpp:
        * profiler/ProfilerOSRExitSite.cpp:
        * profiler/ProfilerOriginStack.cpp:
        * runtime/ArgList.h:
        * runtime/ArrayPrototype.cpp:
        * runtime/ClonedArguments.cpp:
        * runtime/CommonSlowPaths.cpp:
        * runtime/Completion.h:
        * runtime/DataView.h:
        * runtime/DatePrototype.cpp:
        * runtime/DirectEvalExecutable.cpp:
        * runtime/DumpContext.cpp:
        * runtime/FunctionExecutable.cpp:
        * runtime/IndirectEvalExecutable.cpp:
        * runtime/JSArray.cpp:
        * runtime/JSArrayBufferView.cpp:
        * runtime/JSCJSValue.cpp:
        * runtime/JSCJSValueInlines.h:
        * runtime/JSCell.cpp:
        * runtime/JSDataView.cpp:
        * runtime/JSDestructibleObject.h:
        * runtime/JSFunction.cpp:
        * runtime/JSGlobalObject.cpp:
        * runtime/JSGlobalObject.h:
        * runtime/JSONObject.cpp:
        * runtime/JSObject.cpp:
        * runtime/JSObject.h:
        * runtime/JSScope.cpp:
        * runtime/JSScope.h:
        * runtime/LiteralParser.cpp:
        * runtime/OptionsList.h:
        * runtime/PropertyDescriptor.cpp:
        * runtime/PropertyMapHashTable.h:
        * runtime/PropertySlot.h:
        * runtime/PutPropertySlot.h:
        * runtime/RegExpMatchesArray.h:
        * runtime/RegExpPrototype.cpp:
        * runtime/StringPrototype.cpp:
        * runtime/Structure.cpp:
        * runtime/Structure.h:
        * runtime/TestRunnerUtils.cpp:
        * runtime/TypedArrayType.cpp:
        * runtime/VM.cpp:
        * runtime/Watchdog.cpp:
        * runtime/Watchdog.h:
        * runtime/WriteBarrier.h:
        * testRegExp.cpp:
        * tools/JSDollarVM.cpp:
        * wasm/WasmSlowPaths.cpp:
        * yarr/RegularExpression.h:
        * yarr/YarrInterpreter.cpp:
        * yarr/YarrJIT.cpp:
        * yarr/YarrJIT.h:
        * yarr/YarrPattern.cpp:
        * yarr/YarrPattern.h:

2020-05-09  Ross Kirsling  <ross.kirsling@sony.com>

        Fix build errors and warnings for non-unified JSCOnly
        https://bugs.webkit.org/show_bug.cgi?id=211655

        Reviewed by Darin Adler and Yusuke Suzuki.

        * bytecode/BytecodeDumper.cpp:
        (JSC::isConstantRegisterIndex): Deleted.
        Remove unused function.

        * llint/LLIntEntrypoint.cpp:
        * llint/LLIntThunks.cpp:
        * llint/LLIntThunks.h:
        * runtime/AggregateErrorConstructor.cpp:
        * runtime/AggregateErrorPrototype.cpp:
        * wasm/js/WebAssemblyFunction.cpp:
        Fix includes.

        * tools/JSDollarVM.cpp:
        Deal with "unused constant" warnings for needsDestruction.

        * wasm/WasmLLIntPlan.cpp:
        * wasm/WasmSignature.cpp:
        Remove unused constants.

2020-05-08  Darin Adler  <darin@apple.com>

        Streamline MarkupAccumulator to improve efficiency a bit
        https://bugs.webkit.org/show_bug.cgi?id=211656

        Reviewed by Anders Carlsson.

        * b3/air/AirFixPartialRegisterStalls.h: Fix spelling of "explicitly".

2020-05-08  Alexey Shvayka  <shvaikalesh@gmail.com>

        Array.prototype.concat fast path checks should not be observable
        https://bugs.webkit.org/show_bug.cgi?id=211643

        Reviewed by Ross Kirsling.

        This change utilizes @tryGetByIdWithWellKnownSymbol intrinsic to make
        off the spec Symbol.isConcatSpreadable lookups unobservable to userland code,
        aligning JSC with V8 and SpiderMonkey.

        Since @tryGetById uses PropertySlot::getPureResult(), which returns `null`
        for Proxy [[Get]] traps and JS getters (covered by stress/try-get-by-id.js),
        we can safely compare its result `undefined`. Also, this allows us to remove
        @isProxyObject check as Proxy argument is never a fast path anyway.

        This patch is neutral on microbenchmarks/concat-append-one.js.

        * builtins/ArrayPrototype.js:
        (concat):

2020-05-07  Michael Catanzaro  <mcatanzaro@gnome.org>

        Simplify preprocessor guards in GCMemoryOperations.h
        https://bugs.webkit.org/show_bug.cgi?id=211588

        Reviewed by Darin Adler.

        If we adjust the guards a bit, then we don't need to repeat the fallback path.

        * heap/GCMemoryOperations.h:
        (JSC::gcSafeMemmove):
        (JSC::gcSafeZeroMemory):

2020-05-07  Mark Lam  <mark.lam@apple.com>

        Give the DFG and FTL WorkList threads more stack space on ASAN builds.
        https://bugs.webkit.org/show_bug.cgi?id=211535
        <rdar://problem/62947884>

        Reviewed by Geoffrey Garen.

        * dfg/DFGWorklist.cpp:
        (JSC::DFG::Worklist::ThreadBody::ThreadBody):
        - Mark the AutomaticThread as ThreadType::Compiler.

2020-05-07  Daniel Kolesa  <daniel@octaforge.org>

        REGRESSION(r251875): Crash in JSC::StructureIDTable::get on ppc64le: gcSafeMemcpy broken on JSVALUE64 platforms other than x86_64 and aarch64
        https://bugs.webkit.org/show_bug.cgi?id=210685

        Reviewed by Michael Catanzaro.

        Fix gcSafeMemcpy on non-x86_64/aarch64 64-bit architectures.

        We were hitting an incorrect x86_64 assertion on values larger than
        mediumCutoff on JSVALUE64 architectures other than x86_64 and aarch64,
        as the control flow is wrong.

        * heap/GCMemoryOperations.h:
        (JSC::gcSafeMemcpy):

2020-05-07  Mark Lam  <mark.lam@apple.com>

        Add stack checks to the DFG and FTL bytecode parser.
        https://bugs.webkit.org/show_bug.cgi?id=211547
        <rdar://problem/62958880>

        Reviewed by Yusuke Suzuki.

        Inlining can cause some level of recursion of the DFG bytecode parser.  We should
        do a stack check at each inlining check before recursing.  If a stack overflow
        appears to be imminent, then just refuse to inline, and therefore, don't recurse
        deeper into the parser.

        This issue is more noticeable on ASan debug builds where stack frames can be
        humongous.

        Removed the SUPPRESS_ASAN on cloberrize() and the associated comment from r260692.
        It was a mis-diagnosis.  The stack checks are what we need.

        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::handleVarargsInlining):
        (JSC::DFG::ByteCodeParser::handleInlining):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGGraph.h:

2020-05-07  Darin Adler  <darin@apple.com>

        REGRESSION (r261257): Lifetime problem with upconverted characters in toLocaleCase
        https://bugs.webkit.org/show_bug.cgi?id=211580
        rdar://62980449

        Reviewed by Yusuke Suzuki.

        The problem comes from the fact that callBufferProducingFunction is moving the same
        arguments multiple times. At the moment, this works around the only practical
        problem with that, but later it should be fixed in callBufferProducingFunction.

        * runtime/IntlDateTimeFormat.cpp:
        (JSC::IntlDateTimeFormat::initializeDateTimeFormat): Work around mistakes in how
        callBufferProducingFunction works with arguments by calling get() explicitly on the
        result of upconvertedCharacters. Later we could fix callBufferProducingFunction to
        be safer, but for now this solves the problem.
        * runtime/StringPrototype.cpp:
        (JSC::toLocaleCase): Ditto.

2020-05-07  Keith Miller  <keith_miller@apple.com>

        Fix ArrayMode nodes after r261260
        https://bugs.webkit.org/show_bug.cgi?id=211543

        Reviewed by Yusuke Suzuki.

        I accidentally ran tests with a release build rather than
        release+assert when uploading r261260. This patch skips the
        CheckArray node in the ArrayMode clobbersTop() logic before
        Fixup. And also marks a GetArrayLength in the TypedArray
        intrsinics as ExitOK.

        This patch also relands r261260.

        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::handleIntrinsicGetter):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):

2020-05-07  Ryan Haddad  <ryanhaddad@apple.com>

        Unreviewed, reverting r261260.

        Caused 26 JSC test failures

        Reverted changeset:

        "DFG ByVal nodes with ArrayModes should clobberTop until Fixup
        phase runs."
        https://bugs.webkit.org/show_bug.cgi?id=211531
        https://trac.webkit.org/changeset/261260

2020-05-07  Mark Lam  <mark.lam@apple.com>

        Fix broken exceptionFuzz tests.
        https://bugs.webkit.org/show_bug.cgi?id=211550

        Reviewed by Yusuke Suzuki.

        Remove the bad and now unused utility function to set Options::useExceptionFuzz().

        * tools/JSDollarVM.cpp:
        (JSC::JSDollarVM::finishCreation):
        (JSC::functionEnableExceptionFuzz): Deleted.

2020-05-06  Keith Miller  <keith_miller@apple.com>

        DFG ByVal nodes with ArrayModes should clobberTop until Fixup phase runs.
        https://bugs.webkit.org/show_bug.cgi?id=211531

        Reviewed by Yusuke Suzuki.

        When parsing bytecode we may pick a relatively constrained
        ArrayMode based on our profiling. Some of these modes may not
        clobber exit state.  However, Fixup sometimes wants to widen this
        to a more generic mode based on other data. This causes us to
        think it was valid to exit immediately after the
        GetByVal/HasIndexedProperty, which would be wrong with the wider
        ArrayMode. We may also incorrectly insert invalidition points
        if clobberize gives us the wrong data.

        To fix this clobberize should say All ByVal nodes clobberTop()
        until after fixup. Additionally, this patch adds an assertion that
        nodes don't go from not clobbering exit state to clobbering exit
        state during fixup.

        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        (JSC::DFG::performFixup):
        * dfg/DFGGraph.h:

2020-05-06  Darin Adler  <darin@apple.com>

        Make a helper for the pattern of ICU functions that may need to be called twice to populate a buffer
        https://bugs.webkit.org/show_bug.cgi?id=211499

        Reviewed by Ross Kirsling.

        * runtime/IntlDateTimeFormat.cpp:
        (JSC::defaultTimeZone): Use callBufferProducingFunction.
        (JSC::canonicalizeTimeZoneName): Ditto.
        (JSC::IntlDateTimeFormat::initializeDateTimeFormat): Ditto.
        (JSC::IntlDateTimeFormat::format const): Ditto.
        (JSC::IntlDateTimeFormat::formatToParts const): Ditto.
        * runtime/IntlLocale.cpp:
        (JSC::LocaleIDBuilder::toCanonical): Ditto.
        (JSC::IntlLocale::language): Ditto.
        (JSC::IntlLocale::script): Ditto.
        (JSC::IntlLocale::region): Ditto.
        * runtime/IntlNumberFormat.cpp:
        (JSC::IntlNumberFormat::format const): Ditto.
        (JSC::IntlNumberFormat::formatToParts const): Ditto.
        * runtime/IntlObject.cpp:
        (JSC::languageTagForLocaleID): Ditto.
        * runtime/IntlRelativeTimeFormat.cpp:
        (JSC::IntlRelativeTimeFormat::formatInternal const): Ditto.
        (JSC::IntlRelativeTimeFormat::formatToParts const): Ditto.
        * runtime/StringPrototype.cpp:
        (JSC::toLocaleCase): Ditto.

2020-05-06  Devin Rousso  <drousso@apple.com>

        ASSERT_WITH_MESSAGE(m_isOwnedByMainThread == isMainThread()) when web inspecting
        https://bugs.webkit.org/show_bug.cgi?id=203638
        <rdar://problem/56761893>

        Reviewed by Brian Burg.

        Mark the `InspectorEnvironment::executionStopwatch` abstract function as `const` and have it
        return a `Stopwatch&` instead of a `RefPtr<Stopwatch>&` as callers assume that it exists.
        By not using a `RefPtr`, an additional `copyRef` can be avoided.

        * inspector/InspectorEnvironment.h:

        * inspector/JSGlobalObjectInspectorController.h:
        * inspector/JSGlobalObjectInspectorController.cpp:
        (Inspector::JSGlobalObjectInspectorController::executionStopwatch const): Added.
        (Inspector::JSGlobalObjectInspectorController::executionStopwatch): Deleted.

        * inspector/agents/InspectorDebuggerAgent.cpp:
        (Inspector::InspectorDebuggerAgent::didPause):
        (Inspector::InspectorDebuggerAgent::breakpointActionProbe):
        (Inspector::InspectorDebuggerAgent::didContinue):
        * inspector/agents/InspectorHeapAgent.cpp:
        (Inspector::InspectorHeapAgent::snapshot):
        (Inspector::InspectorHeapAgent::willGarbageCollect):
        (Inspector::InspectorHeapAgent::didGarbageCollect):
        * inspector/agents/InspectorScriptProfilerAgent.cpp:
        (Inspector::InspectorScriptProfilerAgent::startTracking):
        (Inspector::InspectorScriptProfilerAgent::willEvaluateScript):
        (Inspector::InspectorScriptProfilerAgent::didEvaluateScript):
        (Inspector::InspectorScriptProfilerAgent::trackingComplete):
        * runtime/SamplingProfiler.h:
        * runtime/SamplingProfiler.cpp:
        (JSC::SamplingProfiler::SamplingProfiler):
        * runtime/VM.h:
        * runtime/VM.cpp:
        (JSC::VM::ensureSamplingProfiler):

2020-05-05  Ross Kirsling  <ross.kirsling@sony.com>

        [ECMA-402] Implement Intl.Locale
        https://bugs.webkit.org/show_bug.cgi?id=209772

        Reviewed by Darin Adler and Saam Barati.

        This patch implements the recent ECMA-402 feature Intl.Locale.

        This is effectively a wrapper class for all the pieces of uloc.h that ECMA-402 cares about.
        (If we used the C++ API, there's a LocaleBuilder that would make this much easier, but in sticking to the C API,
        it's basically an object that has an ICU localeID as data and uloc_* functions as methods / getters.
        Furthermore, there's no way to modify said data, so every method / getter can be lazy and cache its result.)

        Usage example:
          >>> locale = new Intl.Locale('ja', { region: 'JP', calendar: 'japanese', numeric: false })
          "ja-JP-u-ca-japanese-kn-false"
          >>> locale.baseName
          "ja-JP"

        Intl.Locale can be used anywhere that Intl APIs accept locale strings as input parameters,
        and is moreover hoped to be the class by which future Web APIs will handle the current locale.

        This feature is runtime-guarded by the `useIntlLocale` option.

        * CMakeLists.txt:
        * DerivedSources-input.xcfilelist:
        * DerivedSources-output.xcfilelist:
        * DerivedSources.make:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * Sources.txt:
        * runtime/CommonIdentifiers.h:
        * runtime/IntlLocale.cpp: Added.
        * runtime/IntlLocale.h: Added.
        * runtime/IntlLocaleConstructor.cpp: Added.
        * runtime/IntlLocaleConstructor.h: Added.
        * runtime/IntlLocalePrototype.cpp: Added.
        * runtime/IntlLocalePrototype.h: Added.
        * runtime/IntlObject.cpp:
        (JSC::IntlObject::finishCreation):
        (JSC::localeIDBufferForLanguageTag): Added.
        (JSC::languageTagForLocaleID): Renamed from JSC::convertICULocaleToBCP47LanguageTag.
        (JSC::intlAvailableLocales):
        (JSC::intlCollatorAvailableLocales):
        (JSC::canonicalizeLanguageTag):
        (JSC::canonicalizeLocaleList):
        (JSC::defaultLocale):
        * runtime/IntlObject.h:
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        (JSC::JSGlobalObject::visitChildren):
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::collatorStructure):
        (JSC::JSGlobalObject::numberFormatStructure):
        (JSC::JSGlobalObject::localeStructure):
        * runtime/OptionsList.h:
        * runtime/VM.cpp:
        (JSC::VM::VM):
        * runtime/VM.h:

2020-05-05  Keith Miller  <keith_miller@apple.com>

        clobberize validator should use branchTest8 directly.
        https://bugs.webkit.org/show_bug.cgi?id=211469

        Reviewed by Yusuke Suzuki.

        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileCurrentBlock):

2020-05-05  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Implement BigInt.asIntN and BigInt.asUintN
        https://bugs.webkit.org/show_bug.cgi?id=181144

        Reviewed by Darin Adler.

        This patch implements BigInt.asIntN[1] and BigInt.asUintN[2] features.
        As the same to the other BigInt runtime C++ code, we port V8 code to JSC to implement both.

        BigInt.asIntN is `static_cast<intN_t>(BigInt value)` and BigInt.asUintN is `static_cast<uintN_t>(BigInt value)`.
        They are getting slice of N bits from two's complement representation of the given BigInt. The difference between
        asIntN and asUintN is asIntN renders MSB as a sign.

        This patch is once rolled out due to ARM64_32 build failure, which is caused by the existing bug[3]. Relanding it
        since it is now fixed.

        [1]: https://tc39.es/ecma262/#sec-bigint.asintn
        [2]: https://tc39.es/ecma262/#sec-bigint.asuintn
        [3]: https://trac.webkit.org/changeset/261174/webkit

        * runtime/BigIntConstructor.cpp:
        (JSC::toBigInt):
        (JSC::bigIntConstructorFuncAsUintN):
        (JSC::bigIntConstructorFuncAsIntN):
        * runtime/JSBigInt.cpp:
        (JSC::zeroImpl):
        (JSC::JSBigInt::divideImpl):
        (JSC::JSBigInt::unaryMinusImpl):
        (JSC::JSBigInt::remainderImpl):
        (JSC::JSBigInt::digitDiv):
        (JSC::JSBigInt::absoluteSub):
        (JSC::JSBigInt::asIntNImpl):
        (JSC::JSBigInt::asUintNImpl):
        (JSC::JSBigInt::truncateToNBits):
        (JSC::JSBigInt::truncateAndSubFromPowerOfTwo):
        (JSC::JSBigInt::asIntN):
        (JSC::JSBigInt::asUintN):
        * runtime/JSBigInt.h:

2020-05-05  Ross Kirsling  <ross.kirsling@sony.com>

        [Intl] Alphabetize extension keys and correctly mark const methods
        https://bugs.webkit.org/show_bug.cgi?id=211359

        Reviewed by Darin Adler.

        Two cleanup items for Intl classes:

        1. Ensure `resolvedOptions().locale` returns relevant extension keys in alphabetical order.
           ICU does this for us via Intl.getCanonicalLocales / Intl.*.supportedLocalesOf but not via ResolveLocale.
           However, we don't need to do any sorting in ResolveLocale; we can just pre-alphabetize relevantExtensionKeys.
           (See also https://github.com/tc39/ecma402/pull/433.)

        2. Ensure Intl classes are marking const methods correctly.

        * runtime/IntlCollator.cpp:
        (JSC::IntlCollator::sortLocaleData):
        (JSC::IntlCollator::searchLocaleData):
        (JSC::IntlCollator::compareStrings const): Add const specifier.
        (JSC::IntlCollator::resolvedOptions const): Add const specifier.
        * runtime/IntlCollator.h:
        * runtime/IntlDateTimeFormat.cpp:
        (JSC::IntlDateTimeFormat::localeData):
        (JSC::IntlDateTimeFormat::resolvedOptions const): Add const specifier.
        (JSC::IntlDateTimeFormat::format const): Add const specifier.
        (JSC::IntlDateTimeFormat::formatToParts const): Add const specifier.
        * runtime/IntlDateTimeFormat.h:
        * runtime/IntlNumberFormat.cpp:
        (JSC::IntlNumberFormat::format const): Add const specifier.
        (JSC::IntlNumberFormat::resolvedOptions const): Add const specifier.
        (JSC::IntlNumberFormat::formatToParts const): Add const specifier.
        * runtime/IntlNumberFormat.h:
        * runtime/IntlPluralRules.cpp:
        (JSC::IntlPluralRules::resolvedOptions const): Add const specifier.
        (JSC::IntlPluralRules::select const): Add const specifier.
        * runtime/IntlPluralRules.h:
        * runtime/IntlRelativeTimeFormat.cpp:
        (JSC::IntlRelativeTimeFormat::resolvedOptions const): Add const specifier.
        (JSC::IntlRelativeTimeFormat::formatInternal const): Add const specifier.
        (JSC::IntlRelativeTimeFormat::format const): Add const specifier.
        (JSC::IntlRelativeTimeFormat::formatToParts const): Add const specifier.
        * runtime/IntlRelativeTimeFormat.h:

2020-05-05  Keith Miller  <keith_miller@apple.com>

        Add Clobberize validator for clobber top.
        https://bugs.webkit.org/show_bug.cgi?id=209432

        Reviewed by Yusuke Suzuki.

        * assembler/MacroAssemblerARMv7.h:
        (JSC::MacroAssemblerARMv7::scratchRegister):
        * assembler/MacroAssemblerMIPS.h:
        (JSC::MacroAssemblerMIPS::scratchRegister):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileCurrentBlock):
        * dfg/DFGSpeculativeJIT64.cpp:
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::lower):
        (JSC::FTL::DFG::LowerDFGToB3::compileBlock):
        (JSC::FTL::DFG::LowerDFGToB3::compileNode):
        * interpreter/Interpreter.cpp:
        (JSC::eval):
        (JSC::Interpreter::executeProgram):
        (JSC::Interpreter::executeCall):
        (JSC::Interpreter::executeConstruct):
        (JSC::Interpreter::execute):
        (JSC::Interpreter::executeModuleProgram):
        * jit/JITCodeInlines.h:
        (JSC::JITCode::execute):
        * llint/LLIntThunks.h:
        (JSC::vmEntryToWasm):
        * runtime/OptionsList.h:
        * runtime/VM.h:

2020-05-05  Mark Lam  <mark.lam@apple.com>

        Allow Bitmap to use up to a UCPURegister word size for internal bit storage.
        https://bugs.webkit.org/show_bug.cgi?id=211328
        <rdar://problem/62755865>

        Reviewed by Yusuke Suzuki.

        * assembler/CPU.h:

2020-05-05  Keith Miller  <keith_miller@apple.com>

        iterator_open should remap the symbolIterator argument correctly when inlined.
        https://bugs.webkit.org/show_bug.cgi?id=211308
        <rdar://problem/62287877>

        Reviewed by Mark Lam.

        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::parseBlock):

2020-05-05  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] JSBigInt::maxLengthBits and JSBigInt::maxLength are wrong
        https://bugs.webkit.org/show_bug.cgi?id=211445

        Reviewed by Mark Lam.

        JSBigInt::maxLengthBits and JSBigInt::maxLength definitions are wrong.

        1. We are defining maxLength and maxLengthBits as an unrelated value to each other. This is wrong.
           maxLength should be defined as maxLengthBits / (sizeof(Digit) * bitsPerByte).
        2. We use `sizeof(void*)` and assume that `sizeof(Digit) == sizeof(void*)`. This is wrong in ARM64_32 environment
           where Digit size is sizeof(uint64_t) while the pointer size is sizeof(uint32_t). This causes compile errors in ARM64_32
           when the code is using these values with static_assert.

        * runtime/JSBigInt.h:

2020-05-05  Yusuke Suzuki  <ysuzuki@apple.com>

        Unreviewed, reverting r261156.

        Break ARM64_32 build due to existing bug

        Reverted changeset:

        "[JSC] Implement BigInt.asIntN and BigInt.asUintN"
        https://bugs.webkit.org/show_bug.cgi?id=181144
        https://trac.webkit.org/changeset/261156

2020-05-05  Alexey Shvayka  <shvaikalesh@gmail.com>

        Object.prototype.toString is not spec-perfect
        https://bugs.webkit.org/show_bug.cgi?id=199138

        Reviewed by Darin Adler and Keith Miller.

        Before ES6, Object.prototype.toString relied only on internal [[Class]] slot. Starting with ES6,
        Object.prototype.toString checks for a handful of internal slots, mimicing [[Class]], to ensure
        backwards compatibility for pre-ES6 instances. Newly-added built-ins provide @@toStringTag for
        the method to use.

        Before this change, Object.prototype.toString in JSC relied on className() a.k.a [[Class]] for
        all instances. For (almost all) new built-ins, it was overriden by toStringName() returning
        "Object", while @@toStringTag was set to correct value. This is quite an error-prone approach
        and observable spec discrepancy if @@toStringTag is deleted or set to a non-string.

        This change eliminates the above-mentioned discrepancy and fixes Object.prototype.toString
        to return "[object Function]" for callable Proxy objects, aligning JSC with the spec [1], V8,
        and SpiderMonkey.

        For Object.prototype.toString to work through DebuggerScope and JSProxy, we perform all checks
        in JSObject::toStringName(). Given that isArray() may throw a TypeError [2], we invoke
        toStringName() before @@toStringTag lookup to accomodate revoked Proxy case.

        Also, this patch defines @@toStringTag for WebAssembly namespace object (to match Chrome),
        JSC shell, and ConsoleObject.

        [1]: https://tc39.es/ecma262/#sec-object.prototype.tostring
        [2]: https://tc39.es/ecma262/#sec-isarray (step 3.a)

        * jsc.cpp:
        * runtime/BigIntObject.cpp:
        (JSC::BigIntObject::toStringName): Deleted.
        * runtime/BigIntObject.h:
        * runtime/BooleanObject.cpp:
        (JSC::BooleanObject::toStringName):
        * runtime/BooleanObject.h:
        * runtime/ConsoleObject.cpp:
        (JSC::ConsoleObject::finishCreation):
        * runtime/DateInstance.cpp:
        (JSC::DateInstance::toStringName):
        * runtime/DateInstance.h:
        * runtime/ErrorInstance.cpp:
        (JSC::ErrorInstance::toStringName):
        * runtime/ErrorInstance.h:
        * runtime/JSArrayBufferView.cpp:
        (JSC::JSArrayBufferView::toStringName): Deleted.
        * runtime/JSArrayBufferView.h:
        * runtime/JSMap.cpp:
        (JSC::JSMap::toStringName): Deleted.
        * runtime/JSMap.h:
        * runtime/JSObject.cpp:
        (JSC::JSObject::toStringName):
        * runtime/JSSet.cpp:
        (JSC::JSSet::toStringName): Deleted.
        * runtime/JSSet.h:
        * runtime/JSWeakMap.cpp:
        (JSC::JSWeakMap::toStringName): Deleted.
        * runtime/JSWeakMap.h:
        * runtime/JSWeakObjectRef.cpp:
        (JSC::JSWeakObjectRef::toStringName): Deleted.
        * runtime/JSWeakObjectRef.h:
        * runtime/JSWeakSet.cpp:
        (JSC::JSWeakSet::toStringName): Deleted.
        * runtime/JSWeakSet.h:
        * runtime/NumberObject.cpp:
        (JSC::NumberObject::toStringName):
        * runtime/NumberObject.h:
        * runtime/ObjectPrototype.cpp:
        (JSC::objectProtoFuncToString):
        * runtime/ProxyObject.cpp:
        (JSC::ProxyObject::toStringName): Deleted.
        * runtime/ProxyObject.h:
        * runtime/RegExpObject.cpp:
        (JSC::RegExpObject::toStringName):
        * runtime/RegExpObject.h:
        * runtime/StringObject.cpp:
        (JSC::StringObject::toStringName):
        * runtime/StringObject.h:
        * runtime/SymbolObject.cpp:
        (JSC::SymbolObject::toStringName): Deleted.
        * runtime/SymbolObject.h:
        * wasm/js/JSWebAssembly.cpp:
        (JSC::JSWebAssembly::finishCreation):

2020-05-04  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Implement BigInt.asIntN and BigInt.asUintN
        https://bugs.webkit.org/show_bug.cgi?id=181144

        Reviewed by Darin Adler.

        This patch implements BigInt.asIntN[1] and BigInt.asUintN[2] features.
        As the same to the other BigInt runtime C++ code, we port V8 code to JSC to implement both.

        BigInt.asIntN is `static_cast<intN_t>(BigInt value)` and BigInt.asUintN is `static_cast<uintN_t>(BigInt value)`.
        They are getting slice of N bits from two's complement representation of the given BigInt. The difference between
        asIntN and asUintN is asIntN renders MSB as a sign.

        [1]: https://tc39.es/ecma262/#sec-bigint.asintn
        [2]: https://tc39.es/ecma262/#sec-bigint.asuintn

        * runtime/BigIntConstructor.cpp:
        (JSC::toBigInt):
        (JSC::bigIntConstructorFuncAsUintN):
        (JSC::bigIntConstructorFuncAsIntN):
        * runtime/JSBigInt.cpp:
        (JSC::JSBigInt::zeroImpl):
        (JSC::JSBigInt::divideImpl):
        (JSC::JSBigInt::unaryMinusImpl):
        (JSC::JSBigInt::remainderImpl):
        (JSC::JSBigInt::digitDiv):
        (JSC::JSBigInt::asIntNImpl):
        (JSC::JSBigInt::asUintNImpl):
        (JSC::JSBigInt::truncateToNBits):
        (JSC::JSBigInt::truncateAndSubFromPowerOfTwo):
        (JSC::JSBigInt::asIntN):
        (JSC::JSBigInt::asUintN):
        * runtime/JSBigInt.h:

2020-05-04  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] DFG NotCellUse is used without considering about BigInt32
        https://bugs.webkit.org/show_bug.cgi?id=211395

        Reviewed by Saam Barati.

        When we see CompareXXX(BigInt32, Double), we are emitting CompareXXX(DoubleRep(BigInt:NotCellUse), Double). But this has two problems.

        1. We should emit CompareXXX(UntypedUse, UntypedUse) in this case.
        2. DoubleRep(NotCellUse) does not support converting BigInt32 to double. Since DoubleRep's semantics is for ToNumber, it should not
           accept BigInt32 since it should throw an error. However, DoubleRep currently assumes that NotCellUse value can be converted to double
           without any errors.

        To keep DoubleRep's semantics ToNumber, we replace NotCellUse with NotCellNorBigIntUse, which rejects BigInt32. This patch also uses NotCellNorBigIntUse
        for ValueToInt32 because of the same reason.

        For CompareXXX and CompareEq nodes, we can optimize it if we introduce new DoubleRepAcceptingBigInt32 DFG node which can convert BigInt32 to Double, since
        CompareXXX and CompareEq are not requiring toNumber semantics. This should be done in a separate bug https://bugs.webkit.org/show_bug.cgi?id=211407.

        * bytecode/SpeculatedType.h:
        (JSC::isNotCellNorBigIntSpeculation):
        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        (JSC::DFG::FixupPhase::fixIntConvertingEdge):
        (JSC::DFG::FixupPhase::fixupChecksInBlock):
        * dfg/DFGNode.h:
        (JSC::DFG::Node::shouldSpeculateNotCellNorBigInt):
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::SafeToExecuteEdge::operator()):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileValueToInt32):
        (JSC::DFG::SpeculativeJIT::compileDoubleRep):
        (JSC::DFG::SpeculativeJIT::speculateNotCellNorBigInt):
        (JSC::DFG::SpeculativeJIT::speculate):
        * dfg/DFGSpeculativeJIT.h:
        * dfg/DFGUseKind.cpp:
        (WTF::printInternal):
        * dfg/DFGUseKind.h:
        (JSC::DFG::typeFilterFor):
        (JSC::DFG::checkMayCrashIfInputIsEmpty):
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileDoubleRep):
        (JSC::FTL::DFG::LowerDFGToB3::compileValueToInt32):
        (JSC::FTL::DFG::LowerDFGToB3::numberOrNotCellNorBigIntToInt32):
        (JSC::FTL::DFG::LowerDFGToB3::speculate):
        (JSC::FTL::DFG::LowerDFGToB3::speculateNotCellNorBigInt):
        (JSC::FTL::DFG::LowerDFGToB3::numberOrNotCellToInt32): Deleted.

2020-05-04  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Add @@toStringTag to WebAssembly.Global
        https://bugs.webkit.org/show_bug.cgi?id=211372

        Reviewed by Sam Weinig.

        As r260992 did for the other wasm prototypes, we should put @@toStringTag to WebAssembly.Global's prototype too.

        * wasm/js/WebAssemblyGlobalPrototype.cpp:
        (JSC::WebAssemblyGlobalPrototype::finishCreation):

2020-05-04  Devin Rousso  <drousso@apple.com>

        Web Inspector: Worker: should use the name of the worker if it exists
        https://bugs.webkit.org/show_bug.cgi?id=211244

        Reviewed by Brian Burg.

        * inspector/protocol/Worker.json:
        Include the `name` in `Worker.workerCreated`.

2020-05-04  Devin Rousso  <drousso@apple.com>

        Web Inspector: provide a way for inspector to turn on/off ITP debug mode and AdClickAttribution debug mode
        https://bugs.webkit.org/show_bug.cgi?id=209763

        Reviewed by Brian Burg.

        * inspector/protocol/Page.json:
        Add new enum values to `Page.Setting`:
         - `AdClickAttributionDebugModeEnabled`
         - `ITPDebugModeEnabled`

2020-05-03  Maciej Stachowiak  <mjs@apple.com>

        Remove no longer needed WebKitAdditions include for JavaScriptCorePrefix.h
        https://bugs.webkit.org/show_bug.cgi?id=211357

        Reviewed by Mark Lam.

        * JavaScriptCorePrefix.h:

2020-05-02  Mark Lam  <mark.lam@apple.com>

        Gardening: rolling out r261050 and r261051.
        https://bugs.webkit.org/show_bug.cgi?id=211328
        <rdar://problem/62755865>

        Not reviewed.

        * assembler/CPU.h:

2020-05-01  Mark Lam  <mark.lam@apple.com>

        Allow Bitmap to use up to a UCPURegister word size for internal bit storage.
        https://bugs.webkit.org/show_bug.cgi?id=211328
        <rdar://problem/62755865>

        Reviewed by Yusuke Suzuki.

        * assembler/CPU.h:

2020-05-01  Saam Barati  <sbarati@apple.com>

        Have a thread local cache for the Wasm LLInt bytecode buffer
        https://bugs.webkit.org/show_bug.cgi?id=211317

        Reviewed by Filip Pizlo and Mark Lam.

        One of the main things slowing down Wasm compile times is the banging
        on bmalloc's global heap lock. This patch makes it so for the bytecode
        instruction buffer, we keep a thread local cache with latest capacity
        the thread needed to compile. This makes it so that in the average case,
        we only do one malloc at the end of a compile to memcpy the final result.
        
        We clear these thread local caches when the WasmWorklist's automatic threads
        underlying machine thread is destroyed.
        
        This is a 15% speedup in zen garden compile times on a 16-core Mac Pro.
        This is a 4-5% speedup in zen garden compile times on a 6-core MBP.

        * bytecode/InstructionStream.h:
        (JSC::InstructionStreamWriter::setInstructionBuffer):
        (JSC::InstructionStreamWriter::finalize):
        * wasm/WasmLLIntGenerator.cpp:
        (JSC::Wasm::threadSpecificBuffer):
        (JSC::Wasm::clearLLIntThreadSpecificCache):
        (JSC::Wasm::LLIntGenerator::LLIntGenerator):
        (JSC::Wasm::LLIntGenerator::finalize):
        * wasm/WasmLLIntGenerator.h:
        * wasm/WasmWorklist.cpp:

2020-05-01  Per Arne Vollan  <pvollan@apple.com>

        [Win] Fix AppleWin build
        https://bugs.webkit.org/show_bug.cgi?id=211324

        Reviewed by Don Olmstead.

        Check if target WTF_CopyHeaders exists before using it.

        * CMakeLists.txt:

2020-05-01  Don Olmstead  <don.olmstead@sony.com>

        [GTK] Add additional exports to support hidden visibility
        https://bugs.webkit.org/show_bug.cgi?id=211246

        Reviewed by Michael Catanzaro.

        * API/glib/JSCContextPrivate.h:
        * API/glib/JSCValuePrivate.h:
        * inspector/remote/glib/RemoteInspectorServer.h:
        * inspector/remote/glib/RemoteInspectorUtils.h:

2020-05-01  Don Olmstead  <don.olmstead@sony.com>

        Use export macros on all platforms
        https://bugs.webkit.org/show_bug.cgi?id=211293

        Reviewed by Michael Catanzaro.

        Allow overriding of JS_EXPORT_PRIVATE if desired otherwise use the defaults.

        * runtime/JSExportMacros.h:

2020-05-01  Saam Barati  <sbarati@apple.com>

        Unreviewed. Non-speculative build fix for watchOS build.

        * runtime/ArrayPrototype.cpp:
        (JSC::shift):
        (JSC::unshift):
        (JSC::arrayProtoFuncToLocaleString):
        (JSC::arrayProtoFuncReverse):
        (JSC::arrayProtoFuncSlice):
        (JSC::arrayProtoFuncSplice):
        * runtime/JSONObject.cpp:
        (JSC::Stringifier::Stringifier):

2020-05-01  Saam Barati  <sbarati@apple.com>

        Unreviewed. Speculative build fix for watchOS build.

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

2020-05-01  Alexey Shvayka  <shvaikalesh@gmail.com>

        [WebIDL] Interface prototype objects should define @@toStringTag
        https://bugs.webkit.org/show_bug.cgi?id=211020

        Unreviewed follow-up to r260992.

        * runtime/JSArrayBufferPrototype.cpp:
        (JSC::JSArrayBufferPrototype::finishCreation): Revert change in attempt to fix ARMv7 test.

2020-05-01  David Kilzer  <ddkilzer@apple.com>

        JSC::PropertySlot::m_attributes is uninitialized in constructor
        <https://webkit.org/b/211267>

        Reviewed by Mark Lam.

        * runtime/PropertySlot.h:
        (JSC::PropertySlot::PropertySlot):
        - Initialize m_attributes and m_additionalData, and make use of
          default initializers.

2020-05-01  Alexey Shvayka  <shvaikalesh@gmail.com>

        [WebIDL] Interface prototype objects should define @@toStringTag
        https://bugs.webkit.org/show_bug.cgi?id=211020

        Reviewed by Darin Adler.

        WebIDL spec was recently updated [1] to define @@toStringTag on interface prototype objects.
        This change aligns WebIDL with ECMA-262 built-ins and Blink's behavior. Gecko have also
        expressed implementation commitment.

        This patch implements the spec change, making `X.prototype.toString()` return "[object X]"
        instead of "[object XPrototype]", where X is WebIDL interface. This behavior is proven to
        be web compatible (shipping in Chrome since Q2 2016) and matches class strings of iterator
        prototype objects [2] introduced in r253855.

        We define @@toStringTag for all WebAssembly interfaces but Error subclasses since they
        are not defined using WebIDL [3].

        This change also introduces JSC_TO_STRING_TAG_WITHOUT_TRANSITION() macro that sets up
        @@toStringTag using ClassInfo to avoid extra strings creation, ensuring `className` equality
        between prototype and instance classes (fixing a few discrepancies), as well as correct
        descriptors. It also ensures using faster jsNontrivialString() and relieves from putting
        more code into CodeGeneratorJS.pm.

        [1]: https://github.com/heycam/webidl/pull/357
        [2]: https://heycam.github.io/webidl/#es-iterator-prototype-object
        [3]: https://webassembly.github.io/spec/js-api/#error-objects

        Tests: imported/w3c/web-platform-tests/wasm/jsapi/instance/toString.any.js
               imported/w3c/web-platform-tests/wasm/jsapi/memory/toString.any.js
               imported/w3c/web-platform-tests/wasm/jsapi/module/toString.any.js
               imported/w3c/web-platform-tests/wasm/jsapi/table/toString.any.js

        * runtime/ArrayIteratorPrototype.cpp:
        (JSC::ArrayIteratorPrototype::finishCreation):
        * runtime/AsyncFunctionPrototype.cpp:
        (JSC::AsyncFunctionPrototype::finishCreation):
        * runtime/AsyncGeneratorFunctionPrototype.cpp:
        (JSC::AsyncGeneratorFunctionPrototype::finishCreation):
        * runtime/AsyncGeneratorPrototype.cpp:
        (JSC::AsyncGeneratorPrototype::finishCreation):
        * runtime/BigIntPrototype.cpp:
        (JSC::BigIntPrototype::finishCreation):
        * runtime/GeneratorFunctionPrototype.cpp:
        (JSC::GeneratorFunctionPrototype::finishCreation):
        * runtime/GeneratorPrototype.cpp:
        (JSC::GeneratorPrototype::finishCreation):
        * runtime/IntlCollatorPrototype.cpp:
        (JSC::IntlCollatorPrototype::finishCreation):
        * runtime/IntlDateTimeFormatPrototype.cpp:
        (JSC::IntlDateTimeFormatPrototype::finishCreation):
        * runtime/IntlNumberFormatPrototype.cpp:
        (JSC::IntlNumberFormatPrototype::finishCreation):
        * runtime/IntlPluralRulesPrototype.cpp:
        (JSC::IntlPluralRulesPrototype::finishCreation):
        * runtime/IntlRelativeTimeFormatPrototype.cpp:
        (JSC::IntlRelativeTimeFormatPrototype::finishCreation):
        * runtime/JSArrayBufferPrototype.cpp:
        (JSC::JSArrayBufferPrototype::finishCreation):
        * runtime/JSDataViewPrototype.cpp:
        (JSC::JSDataViewPrototype::finishCreation):
        * runtime/JSONObject.cpp:
        (JSC::JSONObject::finishCreation):
        * runtime/JSObject.h:
        * runtime/JSPromisePrototype.cpp:
        (JSC::JSPromisePrototype::finishCreation):
        * runtime/MapIteratorPrototype.cpp:
        (JSC::MapIteratorPrototype::finishCreation):
        * runtime/MapPrototype.cpp:
        (JSC::MapPrototype::finishCreation):
        * runtime/MathObject.cpp:
        (JSC::MathObject::finishCreation):
        * runtime/RegExpStringIteratorPrototype.cpp:
        (JSC::RegExpStringIteratorPrototype::finishCreation):
        * runtime/SetIteratorPrototype.cpp:
        (JSC::SetIteratorPrototype::finishCreation):
        * runtime/SetPrototype.cpp:
        (JSC::SetPrototype::finishCreation):
        * runtime/StringIteratorPrototype.cpp:
        (JSC::StringIteratorPrototype::finishCreation):
        * runtime/SymbolPrototype.cpp:
        (JSC::SymbolPrototype::finishCreation):
        * runtime/WeakMapPrototype.cpp:
        (JSC::WeakMapPrototype::finishCreation):
        * runtime/WeakObjectRefPrototype.cpp:
        (JSC::WeakObjectRefPrototype::finishCreation):
        * runtime/WeakSetPrototype.cpp:
        (JSC::WeakSetPrototype::finishCreation):
        * wasm/js/WebAssemblyInstancePrototype.cpp:
        (JSC::WebAssemblyInstancePrototype::finishCreation):
        * wasm/js/WebAssemblyMemoryPrototype.cpp:
        (JSC::WebAssemblyMemoryPrototype::finishCreation):
        * wasm/js/WebAssemblyModulePrototype.cpp:
        (JSC::WebAssemblyModulePrototype::finishCreation):
        * wasm/js/WebAssemblyTablePrototype.cpp:
        (JSC::WebAssemblyTablePrototype::finishCreation):

2020-05-01  Saam Barati  <sbarati@apple.com>

        We can't cast toLength result to unsigned
        https://bugs.webkit.org/show_bug.cgi?id=211205
        <rdar://problem/62625562>

        Reviewed by Yusuke Suzuki.

        toLength, according to the spec, returns a 53-bit integer. In our
        implementation, we return a double. However, there were many callsites
        that did something like:
        ```
        unsigned length = toLength(obj);
        ```
        
        This is bad for a few reasons:
        - Casting to unsigned from double is undefined behavior when the integer
        is greater than UINT_MAX. In practice, this means that we'd have different
        engine behavior depending on what architecture we'd be running on. For
        example, if the length were UINT_MAX + 1, on x86, we'd treat the
        length as zero. On arm64, we'd treat it as UINT_MAX. Both are wrong.
        - We weren't spec compliant. We were just ignoring that these numbers could
        be 53-bit integers.
        
        This patch addresses each bad use of the undefined behavior, and by doing so,
        makes us more spec compliant.

        * dfg/DFGOperations.cpp:
        * jit/JITOperations.cpp:
        (JSC::getByVal):
        * runtime/ArrayPrototype.cpp:
        (JSC::getProperty):
        (JSC::setLength):
        (JSC::argumentClampedIndexFromStartOrEnd):
        (JSC::shift):
        (JSC::unshift):
        (JSC::arrayProtoFuncToLocaleString):
        (JSC::arrayProtoFuncPop):
        (JSC::arrayProtoFuncPush):
        (JSC::arrayProtoFuncReverse):
        (JSC::arrayProtoFuncShift):
        (JSC::arrayProtoFuncSlice):
        (JSC::arrayProtoFuncSplice):
        (JSC::arrayProtoFuncUnShift):
        (JSC::fastIndexOf):
        (JSC::arrayProtoFuncIndexOf):
        (JSC::arrayProtoFuncLastIndexOf):
        * runtime/Identifier.h:
        (JSC::Identifier::from):
        * runtime/IntlObject.cpp:
        (JSC::canonicalizeLocaleList):
        * runtime/JSONObject.cpp:
        (JSC::Stringifier::Stringifier):
        (JSC::Stringifier::Holder::appendNextProperty):
        (JSC::Walker::walk):
        * runtime/JSObject.cpp:
        (JSC::JSObject::hasProperty const):
        * runtime/JSObject.h:
        (JSC::JSObject::putByIndexInline):
        (JSC::JSObject::putDirectIndex):
        (JSC::JSObject::canGetIndexQuickly const):
        (JSC::JSObject::tryGetIndexQuickly const):
        * runtime/JSObjectInlines.h:
        (JSC::JSObject::getPropertySlot):
        (JSC::JSObject::deleteProperty):
        (JSC::JSObject::get const):
        * runtime/PropertySlot.h:
        (JSC::PropertySlot::getValue const):
        * tools/JSDollarVM.cpp:
        (JSC::functionSetUserPreferredLanguages):

2020-04-30  Ross Kirsling  <ross.kirsling@sony.com>

        TriState should be an enum class and use "Indeterminate" instead of "Mixed"
        https://bugs.webkit.org/show_bug.cgi?id=211268

        Reviewed by Mark Lam.

        * b3/B3Const32Value.cpp:
        (JSC::B3::Const32Value::equalConstant const):
        (JSC::B3::Const32Value::notEqualConstant const):
        (JSC::B3::Const32Value::lessThanConstant const):
        (JSC::B3::Const32Value::greaterThanConstant const):
        (JSC::B3::Const32Value::lessEqualConstant const):
        (JSC::B3::Const32Value::greaterEqualConstant const):
        (JSC::B3::Const32Value::aboveConstant const):
        (JSC::B3::Const32Value::belowConstant const):
        (JSC::B3::Const32Value::aboveEqualConstant const):
        (JSC::B3::Const32Value::belowEqualConstant const):
        * b3/B3Const64Value.cpp:
        (JSC::B3::Const64Value::equalConstant const):
        (JSC::B3::Const64Value::notEqualConstant const):
        (JSC::B3::Const64Value::lessThanConstant const):
        (JSC::B3::Const64Value::greaterThanConstant const):
        (JSC::B3::Const64Value::lessEqualConstant const):
        (JSC::B3::Const64Value::greaterEqualConstant const):
        (JSC::B3::Const64Value::aboveConstant const):
        (JSC::B3::Const64Value::belowConstant const):
        (JSC::B3::Const64Value::aboveEqualConstant const):
        (JSC::B3::Const64Value::belowEqualConstant const):
        * b3/B3ConstDoubleValue.cpp:
        (JSC::B3::ConstDoubleValue::equalConstant const):
        (JSC::B3::ConstDoubleValue::notEqualConstant const):
        (JSC::B3::ConstDoubleValue::lessThanConstant const):
        (JSC::B3::ConstDoubleValue::greaterThanConstant const):
        (JSC::B3::ConstDoubleValue::lessEqualConstant const):
        (JSC::B3::ConstDoubleValue::greaterEqualConstant const):
        (JSC::B3::ConstDoubleValue::equalOrUnorderedConstant const):
        * b3/B3ConstFloatValue.cpp:
        (JSC::B3::ConstFloatValue::equalConstant const):
        (JSC::B3::ConstFloatValue::notEqualConstant const):
        (JSC::B3::ConstFloatValue::lessThanConstant const):
        (JSC::B3::ConstFloatValue::greaterThanConstant const):
        (JSC::B3::ConstFloatValue::lessEqualConstant const):
        (JSC::B3::ConstFloatValue::greaterEqualConstant const):
        (JSC::B3::ConstFloatValue::equalOrUnorderedConstant const):
        * b3/B3Procedure.cpp:
        (JSC::B3::Procedure::addBoolConstant):
        * b3/B3Procedure.h:
        * b3/B3ReduceStrength.cpp:
        * b3/B3Value.cpp:
        (JSC::B3::Value::equalConstant const):
        (JSC::B3::Value::notEqualConstant const):
        (JSC::B3::Value::lessThanConstant const):
        (JSC::B3::Value::greaterThanConstant const):
        (JSC::B3::Value::lessEqualConstant const):
        (JSC::B3::Value::greaterEqualConstant const):
        (JSC::B3::Value::aboveConstant const):
        (JSC::B3::Value::belowConstant const):
        (JSC::B3::Value::aboveEqualConstant const):
        (JSC::B3::Value::belowEqualConstant const):
        (JSC::B3::Value::equalOrUnorderedConstant const):
        (JSC::B3::Value::asTriState const):
        * b3/B3Value.h:
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::~CodeBlock):
        (JSC::CodeBlock::thresholdForJIT):
        * bytecode/UnlinkedCodeBlock.cpp:
        (JSC::UnlinkedCodeBlock::UnlinkedCodeBlock):
        * bytecode/UnlinkedFunctionExecutable.cpp:
        (JSC::UnlinkedFunctionExecutable::visitChildren):
        * bytecompiler/NodesCodegen.cpp:
        (JSC::ConstantNode::emitBytecodeInConditionContext):
        (JSC::BinaryOpNode::emitBytecodeInConditionContext):
        (JSC::BinaryOpNode::tryFoldToBranch):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::handleIntrinsicCall):
        * dfg/DFGCFGSimplificationPhase.cpp:
        (JSC::DFG::CFGSimplificationPhase::run):
        * dfg/DFGLazyJSValue.cpp:
        (JSC::DFG::equalToSingleCharacter):
        (JSC::DFG::equalToStringImpl):
        (JSC::DFG::LazyJSValue::strictEqual const):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileDataViewGet):
        (JSC::FTL::DFG::LowerDFGToB3::compileDataViewSet):
        * ftl/FTLOutput.cpp:
        (JSC::FTL::Output::equal):
        (JSC::FTL::Output::notEqual):
        (JSC::FTL::Output::above):
        (JSC::FTL::Output::aboveOrEqual):
        (JSC::FTL::Output::below):
        (JSC::FTL::Output::belowOrEqual):
        (JSC::FTL::Output::greaterThan):
        (JSC::FTL::Output::greaterThanOrEqual):
        (JSC::FTL::Output::lessThan):
        (JSC::FTL::Output::lessThanOrEqual):
        * jit/JITOperations.cpp:
        * runtime/CachedTypes.cpp:
        (JSC::UnlinkedCodeBlock::UnlinkedCodeBlock):
        * runtime/DefinePropertyAttributes.h:
        (JSC::DefinePropertyAttributes::DefinePropertyAttributes):
        (JSC::DefinePropertyAttributes::hasWritable const):
        (JSC::DefinePropertyAttributes::writable const):
        (JSC::DefinePropertyAttributes::hasConfigurable const):
        (JSC::DefinePropertyAttributes::configurable const):
        (JSC::DefinePropertyAttributes::hasEnumerable const):
        (JSC::DefinePropertyAttributes::enumerable const):
        (JSC::DefinePropertyAttributes::setWritable):
        (JSC::DefinePropertyAttributes::setConfigurable):
        (JSC::DefinePropertyAttributes::setEnumerable):
        * runtime/IntlCollator.cpp:
        (JSC::IntlCollator::initializeCollator):
        * runtime/IntlDateTimeFormat.cpp:
        (JSC::IntlDateTimeFormat::initializeDateTimeFormat):
        * runtime/IntlNumberFormat.cpp:
        (JSC::IntlNumberFormat::initializeNumberFormat):
        * runtime/IntlObject.cpp:
        (JSC::intlBooleanOption):
        * runtime/JSCJSValueInlines.h:
        (JSC::JSValue::pureStrictEqual):
        (JSC::JSValue::pureToBoolean const):
        * runtime/JSCellInlines.h:
        (JSC::JSCell::pureToBoolean const):

2020-04-30  Ross Kirsling  <ross.kirsling@sony.com>

        [JSC] intlBooleanOption should return TriState instead of taking an out param
        https://bugs.webkit.org/show_bug.cgi?id=211256

        Reviewed by Darin Adler and Mark Lam.

        Boolean options for Intl constructors can have default values of true, false, or undefined.
        To handle the undefined case, intlBooleanOption currently has a `bool& usesFallback` param;
        we should have the return type simply be a TriState instead.

        * runtime/IntlCollator.cpp:
        (JSC::IntlCollator::initializeCollator):
        * runtime/IntlDateTimeFormat.cpp:
        (JSC::IntlDateTimeFormat::initializeDateTimeFormat):
        * runtime/IntlNumberFormat.cpp:
        (JSC::IntlNumberFormat::initializeNumberFormat):
        * runtime/IntlObject.cpp:
        (JSC::intlBooleanOption):
        * runtime/IntlObject.h:

2020-04-30  Devin Rousso  <drousso@apple.com>

        WebKit.WebContent process crashes when web developer tools are opened in Safari
        https://bugs.webkit.org/show_bug.cgi?id=210794
        <rdar://problem/62214651>

        Reviewed by Brian Burg.

        * inspector/InjectedScriptManager.cpp:
        (Inspector::InjectedScriptManager::injectedScriptFor):
        Don't crash if a `TerminatedExecutionError` is thrown.

        * inspector/InjectedScriptBase.cpp:
        (Inspector::InjectedScriptBase::makeCall):
        Report the actual error message. Check that the result has a value before attempting to make
        a `JSON::Value` out of it.

2020-04-29  Ross Kirsling  <ross.kirsling@sony.com>

        Ensure Intl classes don't have naming conflicts with unified builds
        https://bugs.webkit.org/show_bug.cgi?id=211213

        Reviewed by Yusuke Suzuki.

        Each Intl class usually has an array named relevantExtensionsKeys and a function named localeData.
        This can result in redefinition errors when unified builds put two of them into the same translation unit. 
        Some are already guarding against this with an internal namespace while others are not.

        As a uniform approach, this patch makes each localeData function a static method and
        puts each relevantExtensionsKeys array (as well as any constants for its indices) into an internal namespace.

        Furthermore, since three different classes are defining an identical UFieldPositionIteratorDeleter,
        this patch consolidates them into one definition in IntlObject.

        * runtime/IntlCollator.cpp:
        (JSC::IntlCollator::sortLocaleData): Renamed from JSC::sortLocaleData.
        (JSC::IntlCollator::searchLocaleData): Renamed from JSC::searchLocaleData.
        (JSC::IntlCollator::initializeCollator):
        * runtime/IntlCollator.h:
        * runtime/IntlDateTimeFormat.cpp:
        (JSC::IntlDateTimeFormat::localeData): Renamed from JSC::IntlDTFInternal::localeData.
        (JSC::toDateTimeOptionsAnyDate): Renamed from JSC::IntlDTFInternal::toDateTimeOptionsAnyDate.
        (JSC::IntlDateTimeFormat::initializeDateTimeFormat):
        (JSC::UFieldPositionIteratorDeleter::operator() const): Deleted.
        * runtime/IntlDateTimeFormat.h:
        * runtime/IntlNumberFormat.cpp:
        (JSC::IntlNumberFormat::localeData): Renamed from JSC::IntlNFInternal::localeData.
        (JSC::IntlNumberFormat::initializeNumberFormat):
        (JSC::UFieldPositionIteratorDeleter::operator() const): Deleted.
        * runtime/IntlNumberFormat.h:
        * runtime/IntlObject.cpp:
        (JSC::UFieldPositionIteratorDeleter::operator() const): Added.
        * runtime/IntlObject.h:
        * runtime/IntlPluralRules.cpp:
        (JSC::IntlPluralRules::localeData): Renamed from JSC::localeData.
        * runtime/IntlPluralRules.h:
        * runtime/IntlRelativeTimeFormat.cpp:
        (JSC::IntlRelativeTimeFormat::localeData): Renamed from JSC::localeData.
        (JSC::IntlRelativeTimeFormat::initializeRelativeTimeFormat):
        (JSC::UFieldPositionIteratorDeleter::operator() const): Deleted.
        * runtime/IntlRelativeTimeFormat.h:

2020-04-29  Ross Kirsling  <ross.kirsling@sony.com>

        Unreviewed follow-up to r260848.
        LowerDFGToB3 has its own isFunction which should NOT have been renamed.

        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileCreateThis):
        (JSC::FTL::DFG::LowerDFGToB3::compileCreatePromise):
        (JSC::FTL::DFG::LowerDFGToB3::compileCreateInternalFieldObject):
        (JSC::FTL::DFG::LowerDFGToB3::compileIsObjectOrNull):
        (JSC::FTL::DFG::LowerDFGToB3::compileIsFunction):
        (JSC::FTL::DFG::LowerDFGToB3::buildTypeOf):
        (JSC::FTL::DFG::LowerDFGToB3::isFunction): Renamed from isCallable.

2020-04-29  Alexey Shvayka  <shvaikalesh@gmail.com>

        AsyncFromSyncIterator methods should not pass absent values
        https://bugs.webkit.org/show_bug.cgi?id=211147

        Reviewed by Ross Kirsling.

        This patch implements minor spec change [1] to match async and sync iteration
        from the perspective of userland `next` and `return` iterator methods.
        `throw` method always receives an argument, yet we align with others to be
        consistent and future-proof.

        This change is already implemented in SpiderMonkey.

        [1]: https://github.com/tc39/ecma262/pull/1776

        * builtins/AsyncFromSyncIteratorPrototype.js:

2020-04-29  Mark Lam  <mark.lam@apple.com>

        Freezing of Gigacage and JSC Configs should be thread safe.
        https://bugs.webkit.org/show_bug.cgi?id=211201
        <rdar://problem/62597619>

        Reviewed by Yusuke Suzuki.

        If a client creates multiple VM instances in different threads concurrently, the
        following race can occur:

        Config::permanentlyFreeze() contains the following code:

            if (!g_jscConfig.isPermanentlyFrozen)         // Point P1
                g_jscConfig.isPermanentlyFrozen = true;   // Point P2

        Let's say there are 2 threads T1 and T2.

        1. T1 creates a VM and gets to point P1, and sees that g_jscConfig.isPermanentlyFrozen is not set.
           T1 is about to execute P2 when it gets pre-empted.

        2. T2 creates a VM and gets to point P1, and sees that g_jscConfig.isPermanentlyFrozen is not set.
           T2 proceeds to point P2 and sets g_jscConfig.isPermanentlyFrozen to true.
           T2 goes on to freeze the Config and makes it not writable.

        3. T1 gets to run again, and proceeds to point P2.
           T1 tries to set g_jscConfig.isPermanentlyFrozen to true.
           But because the Config has been frozen against writes, the write to
           g_jscConfig.isPermanentlyFrozen results in a crash.

        This is a classic TOCTOU bug.  The fix is simply to ensure that only one thread
        can enter Config::permanentlyFreeze() at a time.

        Ditto for Gigacage::permanentlyFreezeGigacageConfig().

        * runtime/JSCConfig.cpp:
        (JSC::Config::permanentlyFreeze):

2020-04-29  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] JSStringJoiner is missing BigInt handling
        https://bugs.webkit.org/show_bug.cgi?id=211174

        Reviewed by Mark Lam.

        JSStringJoiner missed handling of BigInt (specifically BigInt32) and appending empty string incorrectly.
        In debug build, assertion hits. We should support BigInt in JSStringJoiner.

        * runtime/JSStringJoiner.h:
        (JSC::JSStringJoiner::appendWithoutSideEffects):

2020-04-29  Saam Barati  <sbarati@apple.com>

        U_STRING_NOT_TERMINATED_WARNING ICU must be handled when using the output buffer as a C string
        https://bugs.webkit.org/show_bug.cgi?id=211142
        <rdar://problem/62530860>

        Reviewed by Darin Adler.

        * runtime/IntlDateTimeFormat.cpp:
        (JSC::defaultTimeZone):
        (JSC::canonicalizeTimeZoneName):
        (JSC::IntlDateTimeFormat::initializeDateTimeFormat):
        (JSC::IntlDateTimeFormat::format):
        (JSC::IntlDateTimeFormat::formatToParts):
        * runtime/IntlNumberFormat.cpp:
        (JSC::IntlNumberFormat::format):
        (JSC::IntlNumberFormat::formatToParts):
        * runtime/IntlObject.cpp:
        (JSC::convertICULocaleToBCP47LanguageTag):
        (JSC::canonicalizeLanguageTag):
        * runtime/IntlRelativeTimeFormat.cpp:
        (JSC::IntlRelativeTimeFormat::formatInternal):
        (JSC::IntlRelativeTimeFormat::formatToParts):
        * runtime/StringPrototype.cpp:
        (JSC::toLocaleCase):
        (JSC::normalize):

2020-04-28  Saam Barati  <sbarati@apple.com>

        Unreviewed. Fix 32-bit build.

        * runtime/JSBigInt.cpp:
        (JSC::JSBigInt::createFrom):
        (JSC::Int32BigIntImpl::digit):

2020-04-28  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, reverting r260876 and r260877.
        https://bugs.webkit.org/show_bug.cgi?id=211165

        Broke build (Requested by yusukesuzuki on #webkit).

        Reverted changesets:

        "Unreviewed, build fix on watchOS"
        https://bugs.webkit.org/show_bug.cgi?id=210978
        https://trac.webkit.org/changeset/260876

        "Unreviewed, speculative build fix on watchOS part 2"
        https://bugs.webkit.org/show_bug.cgi?id=210978
        https://trac.webkit.org/changeset/260877

2020-04-28  Yusuke Suzuki  <ysuzuki@apple.com>

        Unreviewed, speculative build fix on watchOS part 2
        https://bugs.webkit.org/show_bug.cgi?id=210978

        * runtime/JSBigInt.cpp:
        (JSC::JSBigInt::createFrom):
        (JSC::Int32BigIntImpl::digit):
        * runtime/JSBigInt.h:

2020-04-28  Yusuke Suzuki  <ysuzuki@apple.com>

        Unreviewed, build fix on watchOS
        https://bugs.webkit.org/show_bug.cgi?id=210978

        * runtime/JSBigInt.cpp:
        (JSC::JSBigInt::createFrom):
        (JSC::Int32BigIntImpl::digit):
        * runtime/JSBigInt.h:

2020-04-28  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] BigInt constructor should accept larger integers than safe-integers
        https://bugs.webkit.org/show_bug.cgi?id=210755

        Reviewed by Darin Adler.

        While our implementation of BigInt constructor only accepts safe integers, it should accept all integers.
        This patch implements it by creating JSBigInt::createFrom(double). We port double bit processing part from
        V8 as the same to the other part of JSBigInt.

        * runtime/BigIntConstructor.cpp:
        (JSC::callBigIntConstructor):
        * runtime/JSBigInt.cpp:
        (JSC::JSBigInt::createFrom):
        * runtime/JSBigInt.h:
        * runtime/MathCommon.h:
        (JSC::isInteger):
        (JSC::isSafeInteger):
        * runtime/NumberConstructor.cpp:
        (JSC::numberConstructorFuncIsSafeInteger):
        * runtime/NumberConstructor.h:

2020-04-28  Ross Kirsling  <ross.kirsling@sony.com>

        [JSC] Align upon the name isCallable instead of isFunction
        https://bugs.webkit.org/show_bug.cgi?id=211140

        Reviewed by Darin Adler.

        Follow-up to r260722. Usage is now cleanly separated between isFunction / getCallData,
        but the name isCallable is still clearer than isFunction so let's flip that after all.

        * API/JSContextRef.cpp:
        (JSGlobalContextSetUnhandledRejectionCallback):
        * API/JSObjectRef.cpp:
        (JSObjectIsFunction):
        * dfg/DFGOperations.cpp:
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileCreateThis):
        (JSC::FTL::DFG::LowerDFGToB3::compileCreatePromise):
        (JSC::FTL::DFG::LowerDFGToB3::compileCreateInternalFieldObject):
        (JSC::FTL::DFG::LowerDFGToB3::compileIsObjectOrNull):
        (JSC::FTL::DFG::LowerDFGToB3::compileIsFunction):
        (JSC::FTL::DFG::LowerDFGToB3::buildTypeOf):
        (JSC::FTL::DFG::LowerDFGToB3::isCallable):
        (JSC::FTL::DFG::LowerDFGToB3::isFunction): Deleted.
        * ftl/FTLOperations.cpp:
        (JSC::FTL::operationTypeOfObjectAsTypeofType):
        * jsc.cpp:
        (functionSetUnhandledRejectionCallback):
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/ExceptionHelpers.cpp:
        (JSC::errorDescriptionForValue):
        * runtime/FunctionPrototype.cpp:
        (JSC::functionProtoFuncToString):
        * runtime/InternalFunction.cpp:
        (JSC::getFunctionRealm):
        * runtime/JSCJSValue.h:
        * runtime/JSCJSValueInlines.h:
        (JSC::JSValue::isCallable const):
        (JSC::JSValue::isFunction const): Deleted.
        * runtime/JSCell.h:
        * runtime/JSCellInlines.h:
        (JSC::JSCell::isCallable):
        (JSC::JSCell::isFunction): Deleted.
        * runtime/JSONObject.cpp:
        (JSC::Stringifier::appendStringifiedValue):
        * runtime/ObjectConstructor.cpp:
        (JSC::toPropertyDescriptor):
        * runtime/ObjectPrototype.cpp:
        (JSC::objectProtoFuncDefineGetter):
        (JSC::objectProtoFuncDefineSetter):
        * runtime/Operations.cpp:
        (JSC::jsTypeStringForValue):
        (JSC::jsIsObjectTypeOrNull):
        * runtime/ProxyObject.cpp:
        (JSC::ProxyObject::structureForTarget):
        (JSC::ProxyObject::finishCreation):
        * runtime/RuntimeType.cpp:
        (JSC::runtimeTypeForValue):
        * tools/JSDollarVM.cpp:
        (JSC::functionCallWithStackSize):
        (JSC::functionFindTypeForExpression):
        (JSC::functionReturnTypeFor):
        (JSC::functionHasBasicBlockExecuted):
        (JSC::functionBasicBlockExecutionCount):
        * wasm/WasmInstance.cpp:
        (JSC::Wasm::Instance::setFunctionWrapper):
        * wasm/WasmOperations.cpp:
        (JSC::Wasm::operationIterateResults):
        (JSC::Wasm::operationWasmRefFunc):
        * wasm/js/WebAssemblyModuleRecord.cpp:
        (JSC::WebAssemblyModuleRecord::link):
        * wasm/js/WebAssemblyWrapperFunction.cpp:
        (JSC::WebAssemblyWrapperFunction::finishCreation):

2020-04-28  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] NumberConstructor should accept BigInt
        https://bugs.webkit.org/show_bug.cgi?id=210835

        Reviewed by Mark Lam.

        This patch fixes our Number constructor behavior to accept BigInt. According to the spec[1],
        Number constructor should accept BigInt and should generate numbers from that.

        We port V8's BigInt to double conversion code as we did for the other HeapBigInt runtime functions.

        And we introduce CallNumberConstructor DFG node and handle Number constructor call with BigInt correctly
        in DFG and FTL. Previously we were emitting ToNumber DFG node for Number constructor. But this is wrong
        now since ToNumber does not accept BigInt and throws an error, and Number constructor should not use
        ToNumber to implement its implementation. So we should introduce slightly different semantics: CallNumberConstructor
        as we introduced CallStringConstructor in addition to ToString DFG node. And we add appropriate BigInt32 path
        to emit efficient CallNumberConstructor machine code.

        [1]: https://tc39.es/ecma262/#sec-number-constructor-number-value

        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGBackwardsPropagationPhase.cpp:
        (JSC::DFG::BackwardsPropagationPhase::propagate):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::handleConstantInternalFunction):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGConstantFoldingPhase.cpp:
        (JSC::DFG::ConstantFoldingPhase::foldConstants):
        * dfg/DFGDoesGC.cpp:
        (JSC::DFG::doesGC):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        (JSC::DFG::FixupPhase::fixupToNumberOrToNumericOrCallNumberConstructor):
        (JSC::DFG::FixupPhase::fixupToNumeric): Deleted.
        (JSC::DFG::FixupPhase::fixupToNumber): Deleted.
        * dfg/DFGNode.h:
        (JSC::DFG::Node::hasHeapPrediction):
        * dfg/DFGNodeType.h:
        * dfg/DFGOperations.cpp:
        * dfg/DFGOperations.h:
        * dfg/DFGPredictionPropagationPhase.cpp:
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileToNumeric):
        (JSC::DFG::SpeculativeJIT::compileCallNumberConstructor):
        * dfg/DFGSpeculativeJIT.h:
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileNode):
        (JSC::FTL::DFG::LowerDFGToB3::compileCallNumberConstructor):
        * runtime/JSBigInt.cpp:
        (JSC::JSBigInt::decideRounding):
        (JSC::JSBigInt::toNumberHeap):
        * runtime/JSBigInt.h:
        * runtime/NumberConstructor.cpp:
        (JSC::constructNumberConstructor):
        (JSC::callNumberConstructor):

2020-04-27  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Throw OutOfMemoryError instead of RangeError if BigInt is too big
        https://bugs.webkit.org/show_bug.cgi?id=211111

        Reviewed by Saam Barati.

        Currently, we are throwing a RangeError if we detect that JSBigInt becomes too large. But this is not consistent with our JSString's policy.
        We should throw OutOfMemoryError in this case. This also makes DFG simple since DFG allows throwing OutOfMemoryError in any places which node
        is even removed.

        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * runtime/ExceptionHelpers.cpp:
        (JSC::throwOutOfMemoryError):
        * runtime/ExceptionHelpers.h:
        * runtime/JSBigInt.cpp:
        (JSC::JSBigInt::tryCreateWithLength):
        (JSC::JSBigInt::exponentiateHeap):
        (JSC::JSBigInt::leftShiftByAbsolute):
        (JSC::JSBigInt::allocateFor):

2020-04-27  Saam Barati  <sbarati@apple.com>

        BigInt math runtime shouldn't convert BigInt32 input operands to a heap cell when doing math
        https://bugs.webkit.org/show_bug.cgi?id=210978

        Reviewed by Yusuke Suzuki.

        This patch adds support in the runtime for doing alomst all BigInt math
        operations on the inputs either being Int32, HeapBigInt, or a mixing
        of both. Before, if we detected a binary operation on an Int32 and a
        HeapBigInt, this would lead us to convert the Int32 operand into a HeapBigInt.
        
        This is especially bad because we'd repeat this for all math ops. For example,
        if x is a BigInt32, and all rhs are a HeapBigInt, we'd repeatedly convert x
        to a HeapBigInt for each operation:
        ```
        x + y
        x * y
        x - y
        x >> y
        x << y
        etc
        ```
        
        To teach the runtime how to operate both over a BigInt32 and a HeapBigInt, I
        templatized the runtime math operations to work both over BigInt32 and
        HeapBigInt wrapper classes that expose the same interface.
        
        This is a ~28% speedup on microbenchmarks/sunspider-sha1-big-int.js

        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compare):
        * jit/JITOperations.cpp:
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/JSBigInt.cpp:
        (JSC::HeapBigIntImpl::HeapBigIntImpl):
        (JSC::HeapBigIntImpl::isZero):
        (JSC::HeapBigIntImpl::sign):
        (JSC::HeapBigIntImpl::length):
        (JSC::HeapBigIntImpl::digit):
        (JSC::HeapBigIntImpl::toHeapBigInt):
        (JSC::Int32BigIntImpl::Int32BigIntImpl):
        (JSC::Int32BigIntImpl::isZero):
        (JSC::Int32BigIntImpl::sign):
        (JSC::Int32BigIntImpl::length):
        (JSC::Int32BigIntImpl::digit):
        (JSC::Int32BigIntImpl::toHeapBigInt):
        (JSC::JSBigInt::ImplResult::ImplResult):
        (JSC::tryConvertToBigInt32):
        (JSC::JSBigInt::inplaceMultiplyAdd):
        (JSC::JSBigInt::exponentiateImpl):
        (JSC::JSBigInt::exponentiate):
        (JSC::JSBigInt::multiplyImpl):
        (JSC::JSBigInt::multiply):
        (JSC::JSBigInt::divideImpl):
        (JSC::JSBigInt::divide):
        (JSC::JSBigInt::copy):
        (JSC::JSBigInt::unaryMinusImpl):
        (JSC::JSBigInt::unaryMinus):
        (JSC::JSBigInt::remainderImpl):
        (JSC::JSBigInt::remainder):
        (JSC::JSBigInt::incImpl):
        (JSC::JSBigInt::inc):
        (JSC::JSBigInt::decImpl):
        (JSC::JSBigInt::dec):
        (JSC::JSBigInt::addImpl):
        (JSC::JSBigInt::add):
        (JSC::JSBigInt::subImpl):
        (JSC::JSBigInt::sub):
        (JSC::JSBigInt::bitwiseAndImpl):
        (JSC::JSBigInt::bitwiseAnd):
        (JSC::JSBigInt::bitwiseOrImpl):
        (JSC::JSBigInt::bitwiseOr):
        (JSC::JSBigInt::bitwiseXorImpl):
        (JSC::JSBigInt::bitwiseXor):
        (JSC::JSBigInt::leftShiftImpl):
        (JSC::JSBigInt::leftShift):
        (JSC::JSBigInt::leftShiftSlow):
        (JSC::JSBigInt::signedRightShiftImpl):
        (JSC::JSBigInt::signedRightShift):
        (JSC::JSBigInt::bitwiseNotImpl):
        (JSC::JSBigInt::bitwiseNot):
        (JSC::JSBigInt::internalMultiplyAdd):
        (JSC::JSBigInt::multiplyAccumulate):
        (JSC::JSBigInt::absoluteCompare):
        (JSC::JSBigInt::compareImpl):
        (JSC::JSBigInt::compare):
        (JSC::JSBigInt::absoluteAdd):
        (JSC::JSBigInt::absoluteSub):
        (JSC::JSBigInt::absoluteDivWithDigitDivisor):
        (JSC::JSBigInt::absoluteDivWithBigIntDivisor):
        (JSC::JSBigInt::absoluteLeftShiftAlwaysCopy):
        (JSC::JSBigInt::absoluteBitwiseOp):
        (JSC::JSBigInt::absoluteAnd):
        (JSC::JSBigInt::absoluteOr):
        (JSC::JSBigInt::absoluteAndNot):
        (JSC::JSBigInt::absoluteXor):
        (JSC::JSBigInt::absoluteAddOne):
        (JSC::JSBigInt::absoluteSubOne):
        (JSC::JSBigInt::leftShiftByAbsolute):
        (JSC::JSBigInt::rightShiftByAbsolute):
        (JSC::JSBigInt::rightShiftByMaximum):
        (JSC::JSBigInt::toStringGeneric):
        (JSC::JSBigInt::toShiftAmount):
        (JSC::JSBigInt::exponentiateHeap): Deleted.
        (JSC::JSBigInt::multiplyHeap): Deleted.
        (JSC::JSBigInt::divideHeap): Deleted.
        (JSC::JSBigInt::unaryMinusHeap): Deleted.
        (JSC::JSBigInt::remainderHeap): Deleted.
        (JSC::JSBigInt::incHeap): Deleted.
        (JSC::JSBigInt::decHeap): Deleted.
        (JSC::JSBigInt::addHeap): Deleted.
        (JSC::JSBigInt::subHeap): Deleted.
        (JSC::JSBigInt::bitwiseAndHeap): Deleted.
        (JSC::JSBigInt::bitwiseOrHeap): Deleted.
        (JSC::JSBigInt::bitwiseXorHeap): Deleted.
        (JSC::JSBigInt::leftShiftHeap): Deleted.
        (JSC::JSBigInt::signedRightShiftHeap): Deleted.
        (JSC::JSBigInt::bitwiseNotHeap): Deleted.
        (JSC::JSBigInt::compareToInt32): Deleted.
        * runtime/JSBigInt.h:
        * runtime/Operations.cpp:
        (JSC::jsAddSlowCase):
        * runtime/Operations.h:
        (JSC::compareBigInt):
        (JSC::compareBigInt32ToOtherPrimitive):
        (JSC::arithmeticBinaryOp):
        (JSC::jsSub):
        (JSC::jsMul):
        (JSC::jsDiv):
        (JSC::jsRemainder):
        (JSC::jsPow):
        (JSC::jsInc):
        (JSC::jsDec):
        (JSC::jsBitwiseNot):
        (JSC::shift):
        (JSC::jsLShift):
        (JSC::jsRShift):
        (JSC::bitwiseBinaryOp):
        (JSC::jsBitwiseAnd):
        (JSC::jsBitwiseOr):
        (JSC::jsBitwiseXor):

2020-04-27  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] >>> should call ToNumeric
        https://bugs.webkit.org/show_bug.cgi?id=211065

        Reviewed by Ross Kirsling.

        While BigInt does not support >>> operator, >>> operator should call ToNumeric (in this case, toBigIntOrInt32) for both before throwing an error.
        We call toBigIntOrInt32 for both operands, and throw an error. And after that, casting int32_t to uint32_t to perform >>> operator. This is correct
        since the only difference between toUint32 and toInt32 is casting int32_t result to uint32_t.

        * dfg/DFGOperations.cpp:
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/Operations.h:
        (JSC::shift):
        (JSC::jsURShift):

2020-04-27  Keith Miller  <keith_miller@apple.com>

        OSR Exit compiler should know and print the exiting DFG node's index
        https://bugs.webkit.org/show_bug.cgi?id=210998

        Reviewed by Mark Lam.

        The only interesting thing here is that we set the node to index 0 if there is no node.
        AFAICT, we only don't have a node when we are checking arguments.

        * dfg/DFGOSRExit.cpp:
        (JSC::DFG::OSRExit::OSRExit):
        (JSC::DFG::operationCompileOSRExit):
        * dfg/DFGOSRExitBase.h:
        (JSC::DFG::OSRExitBase::OSRExitBase):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileInvalidationPoint):
        (JSC::FTL::DFG::LowerDFGToB3::compileCheckSubClass):
        (JSC::FTL::DFG::LowerDFGToB3::blessSpeculation):
        * ftl/FTLOSRExit.cpp:
        (JSC::FTL::OSRExitDescriptor::emitOSRExit):
        (JSC::FTL::OSRExitDescriptor::emitOSRExitLater):
        (JSC::FTL::OSRExitDescriptor::prepareOSRExitHandle):
        (JSC::FTL::OSRExit::OSRExit):
        * ftl/FTLOSRExit.h:
        * ftl/FTLOSRExitCompiler.cpp:
        (JSC::FTL::compileStub):

2020-04-27  Saam Barati  <sbarati@apple.com>

        compilePeepHoleBigInt32Branch needs to handle all conditions
        https://bugs.webkit.org/show_bug.cgi?id=211096
        <rdar://problem/62469971>

        Reviewed by Yusuke Suzuki.

        We were falling through to the generic path for all conditions which
        weren't Equal/NotEqual. The generic path does not do speculation, so
        it was leading to potential miscompiles because we omitted a type check.
        Defining compilePeepHoleBigInt32Branch for other conditions is trivial,
        so this patch just implements that.

        This failure is caught by microbenchmarks/sunspider-sha1-big-int.js

        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compilePeepHoleBranch):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compilePeepHoleBigInt32Branch):

2020-04-27  Jason Lawrence  <lawrence.j@apple.com>

        Unreviewed, reverting r260772.

        This commit caused tests to start failing internally.

        Reverted changeset:

        "OSR Exit compiler should know and print the exiting DFG
        node's index"
        https://bugs.webkit.org/show_bug.cgi?id=210998
        https://trac.webkit.org/changeset/260772

2020-04-27  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Add $vm.assertEnabled() to suppress Debug crash expected tests in release+assert build
        https://bugs.webkit.org/show_bug.cgi?id=211089

        Reviewed by Keith Miller.

        Expose ASSERT_ENABLED condition to the shell to control crash expected tests.

        * tools/JSDollarVM.cpp:
        (JSC::functionAssertEnabled):
        (JSC::JSDollarVM::finishCreation):

2020-04-27  Keith Miller  <keith_miller@apple.com>

        OSR Exit compiler should know and print the exiting DFG node's index
        https://bugs.webkit.org/show_bug.cgi?id=210998

        Reviewed by Mark Lam.

        The only interesting thing here is that we set the node to index 0 if there is no node.
        AFAICT, we only don't have a node when we are checking arguments.

        * dfg/DFGOSRExit.cpp:
        (JSC::DFG::OSRExit::OSRExit):
        (JSC::DFG::operationCompileOSRExit):
        * dfg/DFGOSRExitBase.h:
        (JSC::DFG::OSRExitBase::OSRExitBase):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileInvalidationPoint):
        (JSC::FTL::DFG::LowerDFGToB3::compileCheckSubClass):
        (JSC::FTL::DFG::LowerDFGToB3::blessSpeculation):
        * ftl/FTLOSRExit.cpp:
        (JSC::FTL::OSRExitDescriptor::emitOSRExit):
        (JSC::FTL::OSRExitDescriptor::emitOSRExitLater):
        (JSC::FTL::OSRExitDescriptor::prepareOSRExitHandle):
        (JSC::FTL::OSRExit::OSRExit):
        * ftl/FTLOSRExit.h:
        * ftl/FTLOSRExitCompiler.cpp:
        (JSC::FTL::compileStub):

2020-04-27  Ross Kirsling  <ross.kirsling@sony.com>

        [JSC] CallData/ConstructData should include CallType/ConstructType
        https://bugs.webkit.org/show_bug.cgi?id=211059

        Reviewed by Darin Adler.

        getCallData/getConstructData return a CallType/ConstructType and have a CallData/ConstructData out param,
        and then *both* of these are passed side-by-side to `call`/`construct`, which all seems a bit silly.

        This patch merges CallType/ConstructType into CallData/ConstructData such that getCallData/getConstructData
        no longer need an out param and `call`/`construct` require one less overt parameter.

        In so doing, it also:
        - removes ConstructData entirely as it's an exact duplicate of CallData
        - renames enum value Host to Native in alignment with CallData's union

        * API/JSCallbackConstructor.cpp:
        (JSC::JSCallbackConstructor::getConstructData):
        * API/JSCallbackConstructor.h:
        * API/JSCallbackObject.h:
        * API/JSCallbackObjectFunctions.h:
        (JSC::JSCallbackObject<Parent>::getConstructData):
        (JSC::JSCallbackObject<Parent>::getCallData):
        * API/JSObjectRef.cpp:
        (JSObjectCallAsFunction):
        (JSObjectCallAsConstructor):
        * bindings/ScriptFunctionCall.cpp:
        (Deprecated::ScriptFunctionCall::call):
        * bindings/ScriptFunctionCall.h:
        * dfg/DFGOperations.cpp:
        * inspector/InjectedScriptManager.cpp:
        (Inspector::InjectedScriptManager::createInjectedScript):
        * inspector/InspectorEnvironment.h:
        * interpreter/Interpreter.cpp:
        (JSC::Interpreter::executeProgram):
        (JSC::Interpreter::executeCall):
        (JSC::Interpreter::executeConstruct):
        * interpreter/Interpreter.h:
        * jit/JITOperations.cpp:
        * jsc.cpp:
        (functionDollarAgentReceiveBroadcast):
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::handleHostCall):
        * runtime/ArrayPrototype.cpp:
        (JSC::arrayProtoFuncToString):
        (JSC::arrayProtoFuncToLocaleString):
        * runtime/CallData.cpp:
        (JSC::call):
        (JSC::profiledCall):
        * runtime/CallData.h:
        * runtime/ClassInfo.h:
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/ConstructData.cpp:
        (JSC::construct):
        (JSC::profiledConstruct):
        * runtime/ConstructData.h:
        (JSC::construct):
        (JSC::profiledConstruct):
        (): Deleted.
        * runtime/DatePrototype.cpp:
        (JSC::dateProtoFuncToJSON):
        * runtime/GetterSetter.cpp:
        (JSC::callGetter):
        (JSC::callSetter):
        * runtime/InternalFunction.cpp:
        (JSC::InternalFunction::getCallData):
        (JSC::InternalFunction::getConstructData):
        * runtime/InternalFunction.h:
        * runtime/IteratorOperations.cpp:
        (JSC::iteratorNext):
        (JSC::iteratorClose):
        (JSC::hasIteratorMethod):
        (JSC::iteratorMethod):
        (JSC::iteratorForIterable):
        * runtime/JSBoundFunction.cpp:
        (JSC::boundThisNoArgsFunctionCall):
        (JSC::boundFunctionCall):
        (JSC::boundThisNoArgsFunctionConstruct):
        (JSC::boundFunctionConstruct):
        * runtime/JSCJSValue.h:
        * runtime/JSCell.cpp:
        (JSC::JSCell::getCallData):
        (JSC::JSCell::getConstructData):
        * runtime/JSCell.h:
        * runtime/JSCellInlines.h:
        (JSC::JSCell::isFunction):
        (JSC::JSCell::isConstructor):
        * runtime/JSFunction.cpp:
        (JSC::JSFunction::getCallData):
        (JSC::JSFunction::getConstructData):
        * runtime/JSFunction.h:
        * runtime/JSInternalPromise.cpp:
        (JSC::JSInternalPromise::then):
        * runtime/JSMicrotask.cpp:
        (JSC::JSMicrotask::run):
        * runtime/JSModuleLoader.cpp:
        (JSC::JSModuleLoader::dependencyKeysIfEvaluated):
        (JSC::JSModuleLoader::provideFetch):
        (JSC::JSModuleLoader::loadAndEvaluateModule):
        (JSC::JSModuleLoader::loadModule):
        (JSC::JSModuleLoader::linkAndEvaluateModule):
        (JSC::JSModuleLoader::requestImportModule):
        * runtime/JSONObject.cpp:
        (JSC::Stringifier::isCallableReplacer const):
        (JSC::Stringifier::Stringifier):
        (JSC::Stringifier::toJSON):
        (JSC::Stringifier::appendStringifiedValue):
        (JSC::Walker::Walker):
        (JSC::Walker::callReviver):
        (JSC::JSONProtoFuncParse):
        * runtime/JSObject.cpp:
        (JSC::ordinarySetSlow):
        (JSC::callToPrimitiveFunction):
        (JSC::JSObject::hasInstance):
        (JSC::JSObject::getMethod):
        * runtime/JSObject.h:
        * runtime/JSObjectInlines.h:
        (JSC::getCallData):
        (JSC::getConstructData):
        * runtime/JSPromise.cpp:
        (JSC::JSPromise::createDeferredData):
        (JSC::JSPromise::resolvedPromise):
        (JSC::callFunction):
        * runtime/MapConstructor.cpp:
        (JSC::constructMap):
        * runtime/ObjectPrototype.cpp:
        (JSC::objectProtoFuncToLocaleString):
        * runtime/ProxyObject.cpp:
        (JSC::performProxyGet):
        (JSC::ProxyObject::performInternalMethodGetOwnProperty):
        (JSC::ProxyObject::performHasProperty):
        (JSC::ProxyObject::performPut):
        (JSC::performProxyCall):
        (JSC::ProxyObject::getCallData):
        (JSC::performProxyConstruct):
        (JSC::ProxyObject::getConstructData):
        (JSC::ProxyObject::performDelete):
        (JSC::ProxyObject::performPreventExtensions):
        (JSC::ProxyObject::performIsExtensible):
        (JSC::ProxyObject::performDefineOwnProperty):
        (JSC::ProxyObject::performGetOwnPropertyNames):
        (JSC::ProxyObject::performSetPrototype):
        (JSC::ProxyObject::performGetPrototype):
        * runtime/ProxyObject.h:
        * runtime/ReflectObject.cpp:
        (JSC::reflectObjectConstruct):
        * runtime/SamplingProfiler.cpp:
        (JSC::SamplingProfiler::processUnverifiedStackTraces):
        * runtime/SetConstructor.cpp:
        (JSC::constructSet):
        * runtime/StringPrototype.cpp:
        (JSC::replaceUsingRegExpSearch):
        (JSC::operationStringProtoFuncReplaceRegExpEmptyStr):
        (JSC::operationStringProtoFuncReplaceRegExpString):
        (JSC::replaceUsingStringSearch):
        * runtime/VM.cpp:
        (JSC::VM::callPromiseRejectionCallback):
        * runtime/WeakMapConstructor.cpp:
        (JSC::constructWeakMap):
        * runtime/WeakSetConstructor.cpp:
        (JSC::constructWeakSet):
        * tools/JSDollarVM.cpp:
        (JSC::callWithStackSizeProbeFunction):
        * wasm/js/WebAssemblyModuleRecord.cpp:
        (JSC::WebAssemblyModuleRecord::evaluate):
        * wasm/js/WebAssemblyWrapperFunction.cpp:
        (JSC::callWebAssemblyWrapperFunction):

2020-04-26  Ross Kirsling  <ross.kirsling@sony.com>

        [JSC] Clearly distinguish isConstructor from getConstructData
        https://bugs.webkit.org/show_bug.cgi?id=211053

        Reviewed by Sam Weinig.

        Follow-up to r260722. Remove the isConstructor overload that duplicates getConstructData
        and clearly distinguish the usage of these two functions.

        * runtime/JSCJSValue.h:
        * runtime/JSCJSValueInlines.h:
        * runtime/JSCell.h:
        * runtime/JSCellInlines.h:
        (JSC::JSCell::isConstructor):
        Remove isConstructor overload.

        * runtime/JSBoundFunction.cpp:
        (JSC::JSBoundFunction::create):
        Don't use getConstructData if you don't need ConstructData.

        * runtime/ReflectObject.cpp:
        (JSC::reflectObjectConstruct):
        Use getConstructData if you need ConstructData.

        * API/JSObjectRef.cpp:
        (JSObjectIsFunction):
        Use isFunction (leftover spot from last patch).

2020-04-26  Alexey Shvayka  <shvaikalesh@gmail.com>

        Symbol should have [[Construct]] internal method
        https://bugs.webkit.org/show_bug.cgi?id=211050

        Reviewed by Yusuke Suzuki.

        This change introduces constructSymbol() method, which unconditionally throws
        a TypeError, since its presence is observable when, for example, Symbol is a
        [[ProxyTarget]] itself [1]. Aligns JSC with the spec [2], V8, and SpiderMonkey.

        [1]: https://tc39.es/ecma262/#sec-proxycreate (step 7.b)
        [2]: https://tc39.es/ecma262/#constructor

        * runtime/SymbolConstructor.cpp:
        (JSC::SymbolConstructor::SymbolConstructor):
        (JSC::constructSymbol):

2020-04-26  Alexey Shvayka  <shvaikalesh@gmail.com>

        InternalFunction::createSubclassStructure should use newTarget's globalObject
        https://bugs.webkit.org/show_bug.cgi?id=202599

        Reviewed by Yusuke Suzuki.

        If "prototype" of NewTarget is not an object, built-in constructors [1] should acquire
        default [[Prototype]] from realm of NewTarget, utilizing GetFunctionRealm helper [2].
        Before this change, realm of active constructor was used instead. This patch introduces
        GetFunctionRealm and aligns all subclassable constructors with the spec, V8, and SpiderMonkey.

        This change inlines fast paths checks of InternalFunction::createSubclassStructure() and
        simplifies its signature; getFunctionRealm() is invoked in slow paths only.

        While a dynamically created function uses NewTarget's realm for its default [[Prototype]]
        similar to other built-ins, its "prototype" object inherit from ObjectPrototype
        of active constructor's realm [3] (just like their scope), making it retain references
        to 2 different global objects. To accomodate this behavior, this change introduces
        `scopeGlobalObject` in JSFunction.cpp methods.

        Above-mentioned behavior also simplifies creation of JSGenerator and JSAsyncGenerator
        instances since NewTarget's realm is irrelevant to them.

        IntlCollatorConstructor::collatorStructure() and 6 similar methods are removed:
        a) to impose good practice of using newTarget's globalObject;
        b) with this change, each of them have 1 call site max;
        c) other JSC constructors have no methods alike.

        [1]: https://tc39.es/ecma262/#sec-map-constructor (step 2)
        [2]: https://tc39.es/ecma262/#sec-getfunctionrealm
        [3]: https://tc39.es/ecma262/#sec-createdynamicfunction (steps 23-25)

        * dfg/DFGOperations.cpp:
        * runtime/AggregateErrorConstructor.cpp:
        (JSC::callAggregateErrorConstructor):
        (JSC::constructAggregateErrorConstructor):
        * runtime/AggregateErrorConstructor.h:
        * runtime/AsyncFunctionConstructor.cpp:
        (JSC::constructAsyncFunctionConstructor):
        * runtime/AsyncGeneratorFunctionConstructor.cpp:
        (JSC::constructAsyncGeneratorFunctionConstructor):
        * runtime/BooleanConstructor.cpp:
        (JSC::constructWithBooleanConstructor):
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        (JSC::createInternalFieldObject):
        * runtime/DateConstructor.cpp:
        (JSC::constructDate):
        * runtime/ErrorConstructor.cpp:
        (JSC::constructErrorConstructor):
        * runtime/FunctionConstructor.cpp:
        (JSC::constructFunctionSkippingEvalEnabledCheck):
        * runtime/InternalFunction.cpp:
        (JSC::InternalFunction::createSubclassStructure):
        (JSC::getFunctionRealm):
        (JSC::InternalFunction::createSubclassStructureSlow): Deleted.
        * runtime/InternalFunction.h:
        (JSC::InternalFunction::createSubclassStructure): Deleted.
        * runtime/IntlCollatorConstructor.cpp:
        (JSC::constructIntlCollator):
        (JSC::callIntlCollator):
        * runtime/IntlCollatorConstructor.h:
        * runtime/IntlDateTimeFormatConstructor.cpp:
        (JSC::constructIntlDateTimeFormat):
        (JSC::callIntlDateTimeFormat):
        * runtime/IntlDateTimeFormatConstructor.h:
        * runtime/IntlNumberFormatConstructor.cpp:
        (JSC::constructIntlNumberFormat):
        (JSC::callIntlNumberFormat):
        * runtime/IntlNumberFormatConstructor.h:
        * runtime/IntlPluralRulesConstructor.cpp:
        (JSC::constructIntlPluralRules):
        * runtime/IntlPluralRulesConstructor.h:
        * runtime/IntlRelativeTimeFormatConstructor.cpp:
        (JSC::constructIntlRelativeTimeFormat):
        * runtime/IntlRelativeTimeFormatConstructor.h:
        * runtime/JSArrayBufferConstructor.cpp:
        (JSC::JSGenericArrayBufferConstructor<sharingMode>::constructArrayBuffer):
        * runtime/JSFunction.cpp:
        (JSC::JSFunction::prototypeForConstruction):
        (JSC::JSFunction::getOwnPropertySlot):
        * runtime/JSGenericTypedArrayViewConstructorInlines.h:
        (JSC::constructGenericTypedArrayView):
        * runtime/JSGlobalObjectInlines.h:
        (JSC::JSGlobalObject::arrayStructureForIndexingTypeDuringAllocation const):
        * runtime/MapConstructor.cpp:
        (JSC::constructMap):
        * runtime/NativeErrorConstructor.cpp:
        (JSC::NativeErrorConstructor<errorType>::constructNativeErrorConstructor):
        (JSC::NativeErrorConstructor<errorType>::callNativeErrorConstructor):
        * runtime/NativeErrorConstructor.h:
        * runtime/NumberConstructor.cpp:
        (JSC::constructNumberConstructor):
        * runtime/ObjectConstructor.cpp:
        (JSC::constructObjectWithNewTarget):
        * runtime/RegExpConstructor.cpp:
        (JSC::getRegExpStructure):
        (JSC::constructRegExp):
        (JSC::esSpecRegExpCreate):
        * runtime/RegExpConstructor.h:
        * runtime/SetConstructor.cpp:
        (JSC::constructSet):
        * runtime/StringConstructor.cpp:
        (JSC::constructWithStringConstructor):
        * runtime/WeakMapConstructor.cpp:
        (JSC::constructWeakMap):
        * runtime/WeakObjectRefConstructor.cpp:
        (JSC::constructWeakRef):
        * runtime/WeakSetConstructor.cpp:
        (JSC::constructWeakSet):
        * wasm/js/WebAssemblyCompileErrorConstructor.cpp:
        (JSC::constructJSWebAssemblyCompileError):
        * wasm/js/WebAssemblyInstanceConstructor.cpp:
        (JSC::constructJSWebAssemblyInstance):
        * wasm/js/WebAssemblyLinkErrorConstructor.cpp:
        (JSC::constructJSWebAssemblyLinkError):
        * wasm/js/WebAssemblyModuleConstructor.cpp:
        (JSC::WebAssemblyModuleConstructor::createModule):
        * wasm/js/WebAssemblyRuntimeErrorConstructor.cpp:
        (JSC::constructJSWebAssemblyRuntimeError):

2020-04-26  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] ValueAdd, VaueSub, ValueMul, Inc, Dec should say SpecBigInt32 prediction based on ArithProfile
        https://bugs.webkit.org/show_bug.cgi?id=211038

        Reviewed by Filip Pizlo.

        This patch adds profile feedback to ValueAdd, ValueSub, ValueMul, Inc, Dec to say SpecBigInt32 prediction.

        Our HeapBigInt v.s. BigInt32 strategy is simpler than Double v.s. Int32 strategy: we always
        prefer BigInt32 over HeapBigInt. This is because HeapBigInt calculation and conversion require
        much higher cost than BigInt32. This tradeoff is largely different from Double v.s. Int32.
        So keeping HeapBigInt is simply inefficient when we can use BigInt32.

        This means that ArithProfile's feedback is also very simple. If we see HeapBigInt, this means
        overflow happens. In DFG, we propagate this information to ValueAdd, ValueSub, and ValueMul nodes
        and record it in DFGNodeFlags. And based on this information, we change the prediction and
        speculation in prediction propagation and fixup phase.

        We change exit reason from Overflow to BigInt32Overflow since Overflow is solely used for Int32 case,
        and we have Int52Overflow for Int52 case. We should have BigInt32Overflow for BigInt32 to precisely
        record and tell about what happens in DFG as a feedback for the next compilation.

        We add BigInt32 speculation for ValueSub. Previously, we missed that in fixup phase and we always
        speculate ValueSub with AnyBigIntUse or HeapBigIntUse. Now it can use BigInt32Use.

        We also fix Inc / Dec's fixup phase to use BigInt path. Previously, it was always using UntypedUse since
        `node->child1()->shouldSpeculateUntypedForArithmetic()` returns true for BigInt. We fix the ordering of
        speculation attempts as it is done in the other places in fixup phase.

        This patch offers 7.9% performance improvement in sunspider-sha1-big-int.

                                               ToT                     Patched

            sunspider-sha1-big-int      134.5668+-2.8695     ^    124.6743+-0.7541        ^ definitely 1.0793x faster

        * bytecode/ExitKind.cpp:
        (JSC::exitKindToString):
        * bytecode/ExitKind.h:
        * bytecode/SpeculatedType.h:
        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::makeSafe):
        (JSC::DFG::ByteCodeParser::makeDivSafe):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGGraph.h:
        (JSC::DFG::Graph::binaryArithShouldSpeculateBigInt32):
        (JSC::DFG::Graph::unaryArithShouldSpeculateBigInt32):
        * dfg/DFGNode.h:
        (JSC::DFG::Node::mayHaveBigInt32Result):
        (JSC::DFG::Node::mayHaveHeapBigIntResult):
        (JSC::DFG::Node::mayHaveBigIntResult):
        (JSC::DFG::Node::canSpeculateBigInt32):
        (JSC::DFG::Node::canSpeculateInt52):
        * dfg/DFGNodeFlags.cpp:
        (JSC::DFG::dumpNodeFlags):
        * dfg/DFGNodeFlags.h:
        (JSC::DFG::nodeMayHaveHeapBigInt):
        (JSC::DFG::nodeCanSpeculateBigInt32):
        * dfg/DFGPredictionPropagationPhase.cpp:
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileValueAdd):
        (JSC::DFG::SpeculativeJIT::compileValueSub):
        (JSC::DFG::SpeculativeJIT::compileValueMul):
        (JSC::DFG::SpeculativeJIT::compileValueDiv):
        (JSC::DFG::SpeculativeJIT::speculateHeapBigInt):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileValueAdd):
        (JSC::FTL::DFG::LowerDFGToB3::compileValueSub):
        (JSC::FTL::DFG::LowerDFGToB3::compileValueMul):
        (JSC::FTL::DFG::LowerDFGToB3::compileValueDiv):

2020-04-25  Ross Kirsling  <ross.kirsling@sony.com>

        [JSC] isCallable is redundant with isFunction
        https://bugs.webkit.org/show_bug.cgi?id=211037

        Reviewed by Yusuke Suzuki.

        isCallable is only being used in two places and has the same definition as isFunction (aside from out params).
        Where CallData is needed, getCallData should be used; where CallData is not needed, isFunction should be used.

        * runtime/JSCJSValue.h:
        * runtime/JSCJSValueInlines.h:
        (JSC::JSValue::isCallable const): Deleted.
        * runtime/JSCell.h:
        * runtime/JSCellInlines.h:
        (JSC::JSCell::isCallable): Deleted.
        Remove isCallable.

        * runtime/JSONObject.cpp:
        (JSC::Stringifier::Stringifier):
        (JSC::Stringifier::toJSON):
        Use getCallData if you need CallData.

        * runtime/ExceptionHelpers.cpp:
        (JSC::errorDescriptionForValue):
        * runtime/ObjectConstructor.cpp:
        (JSC::toPropertyDescriptor):
        * runtime/ObjectPrototype.cpp:
        (JSC::objectProtoFuncDefineGetter):
        (JSC::objectProtoFuncDefineSetter):
        Don't use getCallData if you don't need CallData. 

2020-04-25  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Handle BigInt32 INT32_MIN shift amount
        https://bugs.webkit.org/show_bug.cgi?id=211030

        Reviewed by Darin Adler.

        Our BigInt shift-operation does not correctly handle INT32_MIN shift amount, and producing a wrong result.
        This patch fixes it.

        * runtime/Operations.h:
        (JSC::shift):

2020-04-25  Darin Adler  <darin@apple.com>

        [Cocoa] Deal with another round of Xcode upgrade checks
        https://bugs.webkit.org/show_bug.cgi?id=211027

        Reviewed by Alexey Proskuryakov.

        * JavaScriptCore.xcodeproj/project.pbxproj: Bump the upgrade check version.
        Add a harmless base localization; this project contains nothing localized.

2020-04-25  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Add fast path for BigInt32 left-shift
        https://bugs.webkit.org/show_bug.cgi?id=211029

        Reviewed by Saam Barati.

        Currently, the left-shift operation misses the fast path for BigInt32 <> BigInt32 case. This patch adds it. We also fixes
        prediction-propagation for left/right shift to use existing heap prediction instead of polluting the result with SpecBigInt.
        This offer 4.5% improvement in microbenchmarks/sunspider-sha1-big-int.js.

        * dfg/DFGPredictionPropagationPhase.cpp:
        * runtime/Operations.h:
        (JSC::shift):

2020-04-25  Ross Kirsling  <ross.kirsling@sony.com>

        Unreviewed fix for JSC Debug tests following r210853.

        * runtime/IntlObject.cpp:
        (JSC::canonicalizeLanguageTag):
        (JSC::canonicalizeLocaleList):
        (JSC::defaultLocale):
        Deal with unchecked exception by moving tryGetUtf8 call out of canonicalizeLanguageTag; it's meant to
        verify the user input from canonicalizeLocaleList and needn't change the noexcept-ness of defaultLocale.

2020-04-25  Alex Christensen  <achristensen@webkit.org>

        Prepare to remove automatic URL->String conversion operators
        https://bugs.webkit.org/show_bug.cgi?id=211007

        Reviewed by Darin Adler.

        * API/JSAPIGlobalObject.mm:
        (JSC::JSAPIGlobalObject::moduleLoaderResolve):
        (JSC::JSAPIGlobalObject::moduleLoaderImportModule):
        * API/JSScript.mm:
        (validateBytecodeCachePath):
        (+[JSScript scriptOfType:memoryMappedFromASCIIFile:withSourceURL:andBytecodeCache:inVirtualMachine:error:]):
        * inspector/ScriptDebugServer.cpp:
        (Inspector::ScriptDebugServer::sourceParsed):
        * parser/Nodes.h:
        (JSC::ScopeNode::sourceURL const):
        * runtime/CachedTypes.cpp:
        (JSC::CachedSourceProviderShape::encode):
        * runtime/Error.cpp:
        (JSC::addErrorInfo):
        * runtime/ScriptExecutable.h:
        (JSC::ScriptExecutable::sourceURL const):

2020-04-25  Ross Kirsling  <ross.kirsling@sony.com>

        [Intl] Locale validation/canonicalization should defer to ICU
        https://bugs.webkit.org/show_bug.cgi?id=210853

        Reviewed by Darin Adler.

        The mappings for locale canonicalization in latest CLDR are sufficiently complex
        that it really no longer makes sense not to have ICU do this work for us.

        This means the UTS 35 canonicalization desired by ECMA-402 will not be fully achievable until ICU ~67,
        but it's better than reaching right into CLDR and pretending that we *are* ICU.
        (On this point, we thus align with V8 and diverge from SM.)

        Of course, we can still add our own pre-validations / post-canonicalizations if desired.

        * CMakeLists.txt:
        * DerivedSources-input.xcfilelist:
        * DerivedSources-output.xcfilelist:
        * DerivedSources.make:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * Scripts/generateIntlCanonicalizeLanguage.py: Removed.
        * runtime/IntlObject.cpp:
        (JSC::intlAvailableLocales):
        (JSC::intlCollatorAvailableLocales):
        (JSC::canonicalizeLanguageTag):
        (JSC::canonicalizeLocaleList):
        (JSC::defaultLocale):
        (JSC::removeUnicodeLocaleExtension):
        (JSC::addMissingScriptLocales): Deleted. This one was ostensibly a fix for an old ICU bug.
        (JSC::privateUseLangTag): Deleted.
        (JSC::preferredLanguage): Deleted.
        (JSC::preferredRegion): Deleted.
        (JSC::canonicalLangTag): Deleted.
        * ucd/language-subtag-registry.txt: Removed.

2020-04-24  Yusuke Suzuki  <ysuzuki@apple.com>

        Fix internal build by using strcmp instead of using string literal comparison
        https://bugs.webkit.org/show_bug.cgi?id=211011

        Reviewed by Keith Miller.

        Use strcmp for string literal comparison to expect that this is fully handled by compiler and converted into constant at compile time.

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

2020-04-24  Mark Lam  <mark.lam@apple.com>

        Suppress ASan on DFG::clobberize() to work around an ASan bug.
        https://bugs.webkit.org/show_bug.cgi?id=211012
        <rdar://problem/62275430>

        Reviewed by Yusuke Suzuki.

        ASan was incorrectly thinking that we're accessing invalid stack memory when we're not.

        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):

2020-04-24  Alexey Shvayka  <shvaikalesh@gmail.com>

        Fix WASM Error classes and re-sync wpt/wasm/jsapi from upstream
        https://bugs.webkit.org/show_bug.cgi?id=210980

        Reviewed by Keith Miller.

        assert_throws_js() harness, which is extensively used by wpt/wasm/jsapi tests,
        was recently updated to assert that passed constructors subclass Error in
        spec-perfect way.

        With this patch, WebAssembly errors have Error as [[Prototype]] of their constructors
        and define correct "name" and "message" properties on their prototypes, aligning JSC
        with the spec [1], V8 and SpiderMonkey.

        [1]: https://webassembly.github.io/spec/js-api/#error-objects

        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        * wasm/js/WebAssemblyCompileErrorPrototype.cpp:
        (JSC::WebAssemblyCompileErrorPrototype::finishCreation):
        * wasm/js/WebAssemblyLinkErrorPrototype.cpp:
        (JSC::WebAssemblyLinkErrorPrototype::finishCreation):
        * wasm/js/WebAssemblyRuntimeErrorPrototype.cpp:
        (JSC::WebAssemblyRuntimeErrorPrototype::finishCreation):

2020-04-24  Saam Barati  <sbarati@apple.com>

        Return BigInt32 whenever we can
        https://bugs.webkit.org/show_bug.cgi?id=210922

        Reviewed by Yusuke Suzuki.

        This patch makes it so our runtime functions for big int math on heap
        big ints converts the result to a big int 32 when possible.
        
        The inspiration for this patch came from converting SunSpider's sha1 benchmark to
        using big ints. I found that that original implementation of big int 32
        was a ~35% slowdown here. This patch speeds it up by 86% from ToT, and
        36% faster than before big int 32 was introduced.
        
        To make this sound in the DFG/FTL, we are currently reporting that all
        HeapBigInt math ops return SpecBigInt, instead of SpecHeapBigInt.
        However, we want to do better in a follow up. We need some kind of profiling
        system where we determine if we should speculate if the result is big int
        32, a heap big int, or both:
        https://bugs.webkit.org/show_bug.cgi?id=210982

        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGOperations.cpp:
        * dfg/DFGOperations.h:
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileValueBitNot):
        (JSC::DFG::SpeculativeJIT::compileValueBitwiseOp):
        (JSC::DFG::SpeculativeJIT::compileValueLShiftOp):
        (JSC::DFG::SpeculativeJIT::compileValueBitRShift):
        (JSC::DFG::SpeculativeJIT::compileValueAdd):
        (JSC::DFG::SpeculativeJIT::compileValueSub):
        (JSC::DFG::SpeculativeJIT::compileValueMul):
        (JSC::DFG::SpeculativeJIT::compileValueDiv):
        (JSC::DFG::SpeculativeJIT::compileValueMod):
        (JSC::DFG::SpeculativeJIT::compileValuePow):
        * jit/JITOperations.cpp:
        * jsc.cpp:
        (functionCreateBigInt32):
        * runtime/BigIntConstructor.cpp:
        (JSC::toBigInt):
        (JSC::callBigIntConstructor):
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        * runtime/JSBigInt.cpp:
        (JSC::JSBigInt::exponentiateHeap):
        (JSC::JSBigInt::multiplyHeap):
        (JSC::JSBigInt::divideHeap):
        (JSC::JSBigInt::unaryMinusHeap):
        (JSC::JSBigInt::remainderHeap):
        (JSC::JSBigInt::incHeap):
        (JSC::JSBigInt::decHeap):
        (JSC::JSBigInt::addHeap):
        (JSC::JSBigInt::subHeap):
        (JSC::JSBigInt::bitwiseAndHeap):
        (JSC::JSBigInt::bitwiseOrHeap):
        (JSC::JSBigInt::bitwiseXorHeap):
        (JSC::JSBigInt::leftShiftHeap):
        (JSC::JSBigInt::signedRightShiftHeap):
        (JSC::JSBigInt::bitwiseNotHeap):
        (JSC::JSBigInt::absoluteAdd):
        (JSC::JSBigInt::absoluteSub):
        (JSC::JSBigInt::parseInt):
        (JSC::JSBigInt::exponentiate): Deleted.
        (JSC::JSBigInt::multiply): Deleted.
        (JSC::JSBigInt::divide): Deleted.
        (JSC::JSBigInt::unaryMinus): Deleted.
        (JSC::JSBigInt::remainder): Deleted.
        (JSC::JSBigInt::inc): Deleted.
        (JSC::JSBigInt::dec): Deleted.
        (JSC::JSBigInt::add): Deleted.
        (JSC::JSBigInt::sub): Deleted.
        (JSC::JSBigInt::bitwiseAnd): Deleted.
        (JSC::JSBigInt::bitwiseOr): Deleted.
        (JSC::JSBigInt::bitwiseXor): Deleted.
        (JSC::JSBigInt::leftShift): Deleted.
        (JSC::JSBigInt::signedRightShift): Deleted.
        (JSC::JSBigInt::bitwiseNot): Deleted.
        * runtime/JSBigInt.h:
        * runtime/JSCJSValue.h:
        (JSC::jsBigInt32):
        * runtime/JSCJSValueInlines.h:
        (JSC::JSValue::JSValue):
        * runtime/Operations.cpp:
        (JSC::jsAddSlowCase):
        * runtime/Operations.h:
        (JSC::jsSub):
        (JSC::jsMul):
        (JSC::jsDiv):
        (JSC::jsInc):
        (JSC::jsDec):
        (JSC::jsBitwiseNot):
        (JSC::shift):
        (JSC::bitwiseBinaryOp):

2020-04-24  Michael Catanzaro  <mcatanzaro@gnome.org>

        [GTK][WPE][JSCOnly] compile error when -DWTF_CPU_ARM64_CORTEXA53=ON set for arm64
        https://bugs.webkit.org/show_bug.cgi?id=197192

        Reviewed by Yusuke Suzuki.

        This workaround is supposed to fix WebKit on old Cortex A53 CPUs, but it has been broken
        since 2018, and people would like to use WebKit on modern Cortex A53. If anyone using WebKit
        on the original hardware wants to fix and reimplement the workaround, feel free.

        * assembler/ARM64Assembler.h:
        (JSC::ARM64Assembler::adrp):
        (JSC::ARM64Assembler::madd):
        (JSC::ARM64Assembler::msub):
        (JSC::ARM64Assembler::smaddl):
        (JSC::ARM64Assembler::smsubl):
        (JSC::ARM64Assembler::umaddl):
        (JSC::ARM64Assembler::umsubl):
        (JSC::ARM64Assembler::nopCortexA53Fix835769): Deleted.
        (JSC::ARM64Assembler::nopCortexA53Fix843419): Deleted.
        * offlineasm/arm64.rb:
        * offlineasm/instructions.rb:

2020-04-24  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Fix DataFormatJSBigInt32 missing part
        https://bugs.webkit.org/show_bug.cgi?id=210986

        Reviewed by Mark Lam.

        Add missing part of DataFormatJSBigInt32 implementation.

        * bytecode/DataFormat.h:
        (JSC::dataFormatToString):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::checkGeneratedTypeForToInt32):

2020-04-24  Yusuke Suzuki  <ysuzuki@apple.com>

        Unreviewed, build fix in Windows
        https://bugs.webkit.org/show_bug.cgi?id=210892

        Windows MSVC does not have proper understanding of IGNORE_RETURN_TYPE_WARNINGS_BEGIN.

        * runtime/JSBigInt.h:
        (JSC::invertBigIntCompareResult):

2020-04-24  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] DFG compare should speculate BigInt well
        https://bugs.webkit.org/show_bug.cgi?id=210892

        Reviewed by Saam Barati.

        Compare operations in DFG does not support BigInt related speculations. As a result, DFG fixup phase emits DoubleRep for operands, and
        causes OSR exit. This patch adds BigInt32, HeapBigInt, and AnyBigIntUse support to DFG compare operations to avoid OSR exits.
        We also introduce JSBigInt::compareToInt32 to avoid allocating JSBigInt only for comparison, and optimize C++ runtime for JSBigInt comparison.

        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGDoesGC.cpp:
        (JSC::DFG::doesGC):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileValueAdd):
        (JSC::DFG::SpeculativeJIT::compileValueSub):
        (JSC::DFG::SpeculativeJIT::compileValueMul):
        (JSC::DFG::SpeculativeJIT::compare):
        (JSC::DFG::SpeculativeJIT::genericJSValueNonPeepholeCompare):
        (JSC::DFG::SpeculativeJIT::nonSpeculativeNonPeepholeCompare): Deleted.
        * dfg/DFGSpeculativeJIT.h:
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compileBigInt32Compare):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileCompareEq):
        (JSC::FTL::DFG::LowerDFGToB3::compileCompareStrictEq):
        (JSC::FTL::DFG::LowerDFGToB3::compare):
        (JSC::FTL::DFG::LowerDFGToB3::genericJSValueCompare):
        (JSC::FTL::DFG::LowerDFGToB3::nonSpeculativeCompare): Deleted.
        * jit/AssemblyHelpers.h:
        (JSC::AssemblyHelpers::unboxBigInt32):
        * runtime/JSBigInt.cpp:
        (JSC::JSBigInt::compareToInt32):
        * runtime/JSBigInt.h:
        (JSC::swapBigIntCompareResult):
        * runtime/Operations.h:
        (JSC::compareBigInt):
        (JSC::compareBigInt32ToOtherPrimitive):
        (JSC::bigIntCompare):

2020-04-24  Alexey Shvayka  <shvaikalesh@gmail.com>

        Proxy.revocable should not have [[Construct]] slot
        https://bugs.webkit.org/show_bug.cgi?id=210959

        Reviewed by Darin Adler.

        This change removes proxyRevocableConstructorThrowError() since its presence is
        observable when, for example, Proxy.revocable is a [[ProxyTarget]] itself [1].
        Also removes unnecessary newTarget() check in constructProxyObject() and
        2 extra ArgList instances.

        This patch aligns JSC with the spec [2], V8 and SpiderMonkey.

        [1]: https://tc39.es/ecma262/#sec-proxycreate (step 7.b)
        [2]: https://tc39.es/ecma262/#sec-ecmascript-standard-built-in-objects

        * runtime/ProxyConstructor.cpp:
        (JSC::makeRevocableProxy):
        (JSC::ProxyConstructor::finishCreation):
        (JSC::constructProxyObject):
        (JSC::proxyRevocableConstructorThrowError): Deleted.

2020-04-24  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] DFG AI for some bitops + BigInt32 should be precise
        https://bugs.webkit.org/show_bug.cgi?id=210956

        Reviewed by Keith Miller.

        Use SpecBigInt32 for ValueBitXor, ValueBitAnd, and ValueBitOr since they are always producing BigInt32 and they have inlined implementations in DFG / FTL.

        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):

2020-04-23  Alexey Shvayka  <shvaikalesh@gmail.com>

        Remove revoked Proxy checks from ProxyCreate
        https://bugs.webkit.org/show_bug.cgi?id=210862

        Reviewed by Ross Kirsling.

        This change removes revoked Proxy checks from ProxyCreate [1], implementing
        https://github.com/tc39/ecma262/pull/1814 and aligning JSC with SpiderMonkey.
        Also cleans up ProxyObject creation by using isFunction() instead of
        isCallable(), which are identical.

        [1]: https://tc39.es/ecma262/#sec-proxycreate (steps 2, 4)

        * runtime/ProxyObject.cpp:
        (JSC::ProxyObject::structureForTarget):
        (JSC::ProxyObject::finishCreation):

2020-04-22  Keith Miller  <keith_miller@apple.com>

        Fix OSR exiting/iterator object checks in for-of bytecodes
        https://bugs.webkit.org/show_bug.cgi?id=210882

        Reviewed by Saam Barati.

        This patch fixes some bugs in the DFGBytecodeParser where we would
        set the exit origin for the SetLocal following the iterator_open/next
        first call to the next bytecode. This meant that if out-of-line
        Symbol.iterator or next functions returned an unexpected non-cell
        we would OSR past the rest of the next bytecode rather than to the
        first checkpoint.

        This patch also makes sure we properly throw for non-objects returned
        from either of the above functions in all tiers (and adds tests).

        Finally, this patch makes a small optimization where we just ArithBitOr the
        iterator's closed state (index == -1) and index is out of bounds. We can't
        do a CompareBelow check because the index is effectively an int33_t.

        * bytecode/BytecodeIndex.h:
        (JSC::BytecodeIndex::withCheckpoint const):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::nextOpcodeIndex const):
        (JSC::DFG::ByteCodeParser::nextCheckpoint const):
        (JSC::DFG::ByteCodeParser::progressToNextCheckpoint):
        (JSC::DFG::ByteCodeParser::handleCall):
        (JSC::DFG::ByteCodeParser::handleCallVariant):
        (JSC::DFG::ByteCodeParser::handleInlining):
        (JSC::DFG::ByteCodeParser::handleGetById):
        (JSC::DFG::ByteCodeParser::handlePutById):
        (JSC::DFG::ByteCodeParser::parseGetById):
        (JSC::DFG::ByteCodeParser::parseBlock):
        (JSC::DFG::ByteCodeParser::handlePutByVal):
        * jit/JITCall.cpp:
        (JSC::JIT::emitSlow_op_iterator_open):
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
        (JSC::LLInt::handleIteratorNextCheckpoint):

2020-04-22  Darin Adler  <darin@apple.com>

        [Cocoa] Build with UChar as char16_t even in builds that use Apple's internal SDK
        https://bugs.webkit.org/show_bug.cgi?id=210845

        Reviewed by Anders Carlsson.

        * Configurations/Base.xcconfig: Move ICU-configuring macros to Platform.h.

2020-04-22  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] branchIfBigInt32 can use BigInt32Mask and remove branchIfNumber filter
        https://bugs.webkit.org/show_bug.cgi?id=210870

        Reviewed by Saam Barati.

        By using BigInt32Mask, we can detect BigInt32 without filtering Numbers. In this patch,

        1. Remove branchIfBigInt32KnownNotNumber and branchIfNotBigInt32KnownNotNumber. And always use branchBigInt32 and branchNotBigInt32 instead.
        2. Remove branchIfNumber type filtering in DFG.
        3. Use BigInt32Mask based scheme in FTL.
        4. Add and64(TrustedImm64, RegisterID) implementations in MacroAssembler.
        5. Add TagRegistersMode version in branchIfBigInt. We use numberTagRegister to produce really efficient code[1] by avoiding large constant materialization.

        [1]: From
                mov %rax, %rdx
                mov $0xfffe000000000012, %r11
                and %r11, %rdx
                cmp $0x12, %rdx
             To
                lea 0x12(%r14), %rdx
                and %rax, %rdx
                cmp $0x12, %rdx

        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::and64):
        * assembler/MacroAssemblerX86_64.h:
        (JSC::MacroAssemblerX86_64::and64):
        * bytecode/ArithProfile.cpp:
        (JSC::ArithProfile<BitfieldType>::emitObserveResult):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::fillSpeculateBigInt32):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileToNumeric):
        (JSC::FTL::DFG::LowerDFGToB3::compileCompareStrictEq):
        (JSC::FTL::DFG::LowerDFGToB3::compileIsBigInt):
        (JSC::FTL::DFG::LowerDFGToB3::boolify):
        (JSC::FTL::DFG::LowerDFGToB3::buildTypeOf):
        (JSC::FTL::DFG::LowerDFGToB3::lowBigInt32):
        (JSC::FTL::DFG::LowerDFGToB3::isBigInt32):
        (JSC::FTL::DFG::LowerDFGToB3::isNotBigInt32):
        (JSC::FTL::DFG::LowerDFGToB3::isNotAnyBigInt):
        (JSC::FTL::DFG::LowerDFGToB3::speculateBigInt32):
        (JSC::FTL::DFG::LowerDFGToB3::speculateAnyBigInt):
        (JSC::FTL::DFG::LowerDFGToB3::isBigInt32KnownNotCell): Deleted.
        (JSC::FTL::DFG::LowerDFGToB3::isBigInt32KnownNotNumber): Deleted.
        (JSC::FTL::DFG::LowerDFGToB3::isNotBigInt32KnownNotNumber): Deleted.
        (JSC::FTL::DFG::LowerDFGToB3::isNotAnyBigIntKnownNotNumber): Deleted.
        * jit/AssemblyHelpers.cpp:
        (JSC::AssemblyHelpers::emitConvertValueToBoolean):
        (JSC::AssemblyHelpers::branchIfValue):
        * jit/AssemblyHelpers.h:
        (JSC::AssemblyHelpers::branchIfBigInt32):
        (JSC::AssemblyHelpers::branchIfNotBigInt32):
        (JSC::AssemblyHelpers::emitTypeOf):
        (JSC::AssemblyHelpers::branchIfBigInt32KnownNotNumber): Deleted.
        (JSC::AssemblyHelpers::branchIfNotBigInt32KnownNotNumber): Deleted.

2020-04-22  Saam Barati  <sbarati@apple.com>

        BigInt32 parsing should be precise
        https://bugs.webkit.org/show_bug.cgi?id=210869

        Reviewed by Robin Morisset.

        Our algorithm before was conservative, and might produce a heap big int even
        if the value could be an int32. This patch makes the algorithm precise on
        64-bit, always producing a bigint32 if the number is indeed an int32.

        * jsc.cpp:
        (functionUseBigInt32):
        (functionIsBigInt32):
        (functionIsHeapBigInt):
        * runtime/JSBigInt.cpp:
        (JSC::JSBigInt::parseInt):

2020-04-22  Saam Barati  <sbarati@apple.com>

        Edge use kind asserts are wrong for BigInt32 on ValueBitLShift
        https://bugs.webkit.org/show_bug.cgi?id=210872

        Reviewed by Yusuke Suzuki, Mark Lam, and Robin Morisset.

        This is already covered by the v8 tests Yusuke checked in.

        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::emitUntypedOrAnyBigIntBitOp):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileValueBitLShift):
        (JSC::FTL::DFG::LowerDFGToB3::emitBinaryBitOpSnippet):

2020-04-22  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] JSBigInt inc operation does not produce right HeapBigInt zero
        https://bugs.webkit.org/show_bug.cgi?id=210860

        Reviewed by Mark Lam.

        JSBigInt::inc can produce signed HeapBigInt zero, which is not meeting the invariant of JSBigInt.
        This patch fixes it by checking zero status before setting `setSign(true)`.

        * runtime/JSBigInt.cpp:
        (JSC::JSBigInt::inc):
        * runtime/JSCJSValue.cpp:
        (JSC::JSValue::dumpInContextAssumingStructure const):

2020-04-22  Devin Rousso  <drousso@apple.com>

        Web Inspector: Debugger: Step Over should only step through comma expressions if they are comma statements
        https://bugs.webkit.org/show_bug.cgi?id=210588

        Reviewed by Brian Burg.

        * parser/Nodes.h:
        (JSC::ExpressionNode::isStatement const): Added.
        (JSC::ExpressionNode::setIsStatement): Added.
        * parser/NodeConstructors.h:
        (JSC::ExprStatementNode::ExprStatementNode):
        (JSC::DeclarationStatement::DeclarationStatement):
        (JSC::ReturnNode::ReturnNode):
        (JSC::ThrowNode::ThrowNode):
        * bytecompiler/NodesCodegen.cpp:
        (JSC::CommaNode::emitBytecode):
        Only emit `WillExecuteStatement` debug hooks inside `CommaNode` if it's the only child of a
        statement parent node (e.g. `a(), b(), c()` vs `true && (a(), b(), c()) && true`).

        * parser/Parser.h:
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseReturnStatement):
        (JSC::Parser<LexerType>::parseThrowStatement):
        (JSC::Parser<LexerType>::parseExpressionOrLabelStatement):
        (JSC::Parser<LexerType>::parseExpressionStatement):
        (JSC::Parser<LexerType>::parseExpression):
        Only record a pause location for each sub-expression in a comma separated expression if it's
        the only child of a statement (e.g. `a(), b(), c()` vs `true && (a(), b(), c()) && true`).

2020-04-22  Saam Barati  <sbarati@apple.com>

        ValueBitNot is wrong in FTL with AnyBigIntUse
        https://bugs.webkit.org/show_bug.cgi?id=210846

        Reviewed by Yusuke Suzuki.

        We forgot to speculate.

        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileValueBitNot):

2020-04-22  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] AI results of BigInt32 Bitwise shift operation does not match to runtime results
        https://bugs.webkit.org/show_bug.cgi?id=210839

        Reviewed by Saam Barati.

        While runtime function of bitwise ops with BigInt32 sometimes returns HeapBigInt, DFG AI is setting SpecBigInt32
        as a result value. This leads to miscompilation particularly in FTL since FTL uses this information to remove
        a lot of branches.

        And we found that FTL BigInt32 predicate is not correctly checking state. This patch fixes it too.

        Added test case found this (v8-bigint32-sar.js).

        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileValueBitRShift):
        (JSC::FTL::DFG::LowerDFGToB3::compileToNumeric):
        (JSC::FTL::DFG::LowerDFGToB3::compileCompareStrictEq):
        (JSC::FTL::DFG::LowerDFGToB3::compileIsBigInt):
        (JSC::FTL::DFG::LowerDFGToB3::boolify):
        (JSC::FTL::DFG::LowerDFGToB3::buildTypeOf):
        (JSC::FTL::DFG::LowerDFGToB3::lowBigInt32):
        (JSC::FTL::DFG::LowerDFGToB3::isBigInt32KnownNotCell):
        (JSC::FTL::DFG::LowerDFGToB3::isBigInt32KnownNotNumber):
        (JSC::FTL::DFG::LowerDFGToB3::isNotBigInt32KnownNotNumber):
        (JSC::FTL::DFG::LowerDFGToB3::isNotAnyBigIntKnownNotNumber):
        (JSC::FTL::DFG::LowerDFGToB3::isNotHeapBigIntUnknownWhetherCell):
        (JSC::FTL::DFG::LowerDFGToB3::speculateBigInt32):
        (JSC::FTL::DFG::LowerDFGToB3::speculateAnyBigInt):
        (JSC::FTL::DFG::LowerDFGToB3::isBigInt32): Deleted.
        (JSC::FTL::DFG::LowerDFGToB3::isNotBigInt32): Deleted.
        (JSC::FTL::DFG::LowerDFGToB3::isNotAnyBigInt): Deleted.

2020-04-21  Yusuke Suzuki  <ysuzuki@apple.com>

        Unreviewed, build fix for watchOS
        https://bugs.webkit.org/show_bug.cgi?id=210832

        If function is not defined, static declaration should not be declared, otherwise, unused-function-error happens.

        * jsc.cpp:

2020-04-21  Yusuke Suzuki  <ysuzuki@apple.com>

        Unreviewd, speculative Windows build fix part 2
        https://bugs.webkit.org/show_bug.cgi?id=210834

        * runtime/Options.cpp:
        (JSC::strncasecmp):

2020-04-21  Yusuke Suzuki  <ysuzuki@apple.com>

        Unreviewed, fix windows build failure
        https://bugs.webkit.org/show_bug.cgi?id=210834

        * runtime/Options.cpp:
        (JSC::strncasecmp):

2020-04-21  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] SpeculativeJIT::nonSpeculativeNonPeepholeStrictEq should expect AnyBigIntUse
        https://bugs.webkit.org/show_bug.cgi?id=210832

        Reviewed by Mark Lam.

        SpeculativeJIT::nonSpeculativeNonPeepholeStrictEq will get AnyBigIntUse now. We should use ManualOperandSpeculation
        and speculate function to perform speculation check.

        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::nonSpeculativePeepholeStrictEq):
        (JSC::DFG::SpeculativeJIT::nonSpeculativeNonPeepholeStrictEq):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::nonSpeculativeNonPeepholeStrictEq):
        * jsc.cpp:
        (functionCreateHeapBigInt):
        (functionCreateBigInt32):
        * runtime/BigIntConstructor.cpp:
        (JSC::toBigInt):
        (JSC::callBigIntConstructor):
        * runtime/BigIntConstructor.h:
        * runtime/JSBigInt.h:

2020-04-21  Yusuke Suzuki  <ysuzuki@apple.com>

        Canonicalize JSBigInt generated by structured-cloning by calling rightTrim
        https://bugs.webkit.org/show_bug.cgi?id=210816

        Reviewed by Keith Miller and Darin Adler.

        * runtime/JSBigInt.h:

2020-04-21  Peng Liu  <peng.liu6@apple.com>

        Fix MACCATALYST build failures
        https://bugs.webkit.org/show_bug.cgi?id=210815

        Reviewed by Tim Horton.

        * Configurations/FeatureDefines.xcconfig:

2020-04-21  Keith Miller  <keith_miller@apple.com>

        JSC's options should be case insensitive
        https://bugs.webkit.org/show_bug.cgi?id=210834

        Reviewed by Yusuke Suzuki.

        * runtime/Options.cpp:
        (JSC::Options::setOptionWithoutAlias):
        (JSC::Options::setAliasedOption):
        * runtime/OptionsList.h:

2020-04-21  Alexey Shvayka  <shvaikalesh@gmail.com>

        constructObjectFromPropertyDescriptor() is incorrect with partial descriptors
        https://bugs.webkit.org/show_bug.cgi?id=184629

        Reviewed by Ross Kirsling.

        Before this change, constructObjectFromPropertyDescriptor() serialized a value-only descriptor
        with nullish m_seenAttributes to {value, writable: false, enumerable: false, configurable: false}
        instead of just {value}. This was observable when ordinarySetSlow() was called on a Proxy
        `receiver` with "defineProperty" trap.

        This patch makes constructObjectFromPropertyDescriptor() 1:1 with the spec [2], aligning JSC
        with V8 and SpiderMonkey, and also cleans up its call sites from handling exceptions and
        `undefined` value returns.

        [1]: https://tc39.es/ecma262/#sec-ordinarysetwithowndescriptor (step 3.d.iv)
        [2]: https://tc39.es/ecma262/#sec-frompropertydescriptor

        * runtime/ObjectConstructor.cpp:
        (JSC::objectConstructorGetOwnPropertyDescriptor):
        (JSC::objectConstructorGetOwnPropertyDescriptors):
        * runtime/ObjectConstructor.h:
        (JSC::constructObjectFromPropertyDescriptor):
        * runtime/ProxyObject.cpp:
        (JSC::ProxyObject::performDefineOwnProperty):

2020-04-20  Yusuke Suzuki  <ysuzuki@apple.com>

        Check Structure attributes in Object.assign exhaustively
        https://bugs.webkit.org/show_bug.cgi?id=210782
        <rdar://problem/62065853>

        Reviewed by Mark Lam.

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

2020-04-21  Adrian Perez de Castro  <aperez@igalia.com>

        Non-unified build fixes late February 2020 edition
        https://bugs.webkit.org/show_bug.cgi?id=210767

        Unreviewed build fix.

        * dfg/DFGValueRepReductionPhase.cpp: Add missing JSCJSValueInlines.h header.
        * jit/JITCall.cpp: Add missing SlowPathCall.h header.
        * runtime/AggregateError.cpp: Add missing JSCJSValueInlines.h, JSCellInlines.h, and
        JSGlobalObjectInlines.h headers.
        * runtime/AggregateErrorConstructor.cpp: Added missing JSCJSValueInlines.h, JSCellInlines.h,
        and VMInlines.h headers.
        * runtime/AggregateErrorPrototype.cpp: Added missing AggregateError.h, IdentifierInlines.h,
        JSCJSValueInlines.h, JSCellInlines.h, JSGlobalObjectInlines.h, and VMInlines.h headers.
        * runtime/Intrinsic.h: Added missing wtf/Optional.h header.

2020-04-20  Ross Kirsling  <ross.kirsling@sony.com>

        Classes marked final should not use protected access specifier
        https://bugs.webkit.org/show_bug.cgi?id=210775

        Reviewed by Daniel Bates.

        * API/JSAPIValueWrapper.h:
        * API/JSCallbackConstructor.h:
        * API/JSCallbackObject.h:
        * b3/B3ExtractValue.h:
        * bytecode/UnlinkedFunctionExecutable.h:
        * inspector/JSGlobalObjectConsoleClient.h:
        * inspector/JSInjectedScriptHost.h:
        * inspector/JSJavaScriptCallFrame.h:
        * jsc.cpp:
        * runtime/AggregateError.h:
        * runtime/AggregateErrorPrototype.h:
        * runtime/ArrayConstructor.h:
        * runtime/ArrayPrototype.h:
        * runtime/AsyncFunctionPrototype.h:
        * runtime/AsyncGeneratorFunctionPrototype.h:
        * runtime/AtomicsObject.h:
        * runtime/BigIntConstructor.h:
        * runtime/BigIntObject.h:
        * runtime/BigIntPrototype.h:
        * runtime/BooleanConstructor.h:
        * runtime/BooleanPrototype.h:
        * runtime/ConsoleObject.h:
        * runtime/DateConstructor.h:
        * runtime/DatePrototype.h:
        * runtime/ErrorConstructor.h:
        * runtime/ErrorPrototype.h:
        * runtime/FileBasedFuzzerAgent.h:
        * runtime/FunctionPrototype.h:
        * runtime/FunctionRareData.h:
        * runtime/GeneratorFunctionPrototype.h:
        * runtime/GenericTypedArrayView.h:
        * runtime/InspectorInstrumentationObject.h:
        * runtime/IntlCollator.h:
        * runtime/IntlCollatorConstructor.h:
        * runtime/IntlCollatorPrototype.h:
        * runtime/IntlDateTimeFormat.h:
        * runtime/IntlDateTimeFormatConstructor.h:
        * runtime/IntlDateTimeFormatPrototype.h:
        * runtime/IntlNumberFormat.h:
        * runtime/IntlNumberFormatConstructor.h:
        * runtime/IntlNumberFormatPrototype.h:
        * runtime/IntlPluralRules.h:
        * runtime/IntlPluralRulesConstructor.h:
        * runtime/IntlPluralRulesPrototype.h:
        * runtime/IntlRelativeTimeFormatConstructor.h:
        * runtime/IntlRelativeTimeFormatPrototype.h:
        * runtime/JSArrayBuffer.h:
        * runtime/JSArrayBufferConstructor.h:
        * runtime/JSArrayBufferPrototype.h:
        * runtime/JSAsyncGenerator.h:
        * runtime/JSBoundFunction.h:
        * runtime/JSCustomGetterSetterFunction.h:
        * runtime/JSDataView.h:
        * runtime/JSDataViewPrototype.h:
        * runtime/JSGenerator.h:
        * runtime/JSGenericTypedArrayView.h:
        * runtime/JSGenericTypedArrayViewConstructor.h:
        * runtime/JSGenericTypedArrayViewPrototype.h:
        * runtime/JSGlobalLexicalEnvironment.h:
        * runtime/JSModuleLoader.h:
        * runtime/JSModuleNamespaceObject.h:
        * runtime/JSNativeStdFunction.h:
        * runtime/JSONObject.h:
        * runtime/JSObject.h:
        * runtime/JSTemplateObjectDescriptor.h:
        * runtime/JSTypedArrayViewConstructor.h:
        * runtime/JSTypedArrayViewPrototype.h:
        * runtime/MathObject.h:
        * runtime/NativeExecutable.h:
        * runtime/NumberConstructor.h:
        * runtime/NumberPrototype.h:
        * runtime/ObjectConstructor.h:
        * runtime/ObjectPrototype.h:
        * runtime/PredictionFileCreatingFuzzerAgent.h:
        * runtime/ReflectObject.h:
        * runtime/RegExp.h:
        * runtime/RegExpConstructor.h:
        * runtime/RegExpObject.h:
        * runtime/RegExpPrototype.h:
        * runtime/StringPrototype.h:
        * runtime/Structure.h:
        * runtime/Symbol.h:
        * runtime/SymbolConstructor.h:
        * runtime/SymbolObject.h:
        * runtime/SymbolPrototype.h:
        * runtime/VMTraps.cpp:
        * testRegExp.cpp:
        * wasm/WasmBBQPlan.h:
        * wasm/WasmLLIntPlan.h:
        * wasm/WasmWorklist.cpp:
        * wasm/js/JSWebAssembly.h:
        * wasm/js/JSWebAssemblyCompileError.h:
        * wasm/js/JSWebAssemblyInstance.h:
        * wasm/js/JSWebAssemblyLinkError.h:
        * wasm/js/JSWebAssemblyRuntimeError.h:
        * wasm/js/WebAssemblyCompileErrorConstructor.h:
        * wasm/js/WebAssemblyCompileErrorPrototype.h:
        * wasm/js/WebAssemblyGlobalConstructor.h:
        * wasm/js/WebAssemblyGlobalPrototype.h:
        * wasm/js/WebAssemblyInstanceConstructor.h:
        * wasm/js/WebAssemblyInstancePrototype.h:
        * wasm/js/WebAssemblyLinkErrorConstructor.h:
        * wasm/js/WebAssemblyLinkErrorPrototype.h:
        * wasm/js/WebAssemblyMemoryConstructor.h:
        * wasm/js/WebAssemblyMemoryPrototype.h:
        * wasm/js/WebAssemblyModuleConstructor.h:
        * wasm/js/WebAssemblyModulePrototype.h:
        * wasm/js/WebAssemblyRuntimeErrorConstructor.h:
        * wasm/js/WebAssemblyRuntimeErrorPrototype.h:
        * wasm/js/WebAssemblyTableConstructor.h:
        * wasm/js/WebAssemblyTablePrototype.h:
        * wasm/js/WebAssemblyWrapperFunction.h:

2020-04-20  Peng Liu  <peng.liu6@apple.com>

        Fix build failures when video fullscreen and picture-in-picture is disabled
        https://bugs.webkit.org/show_bug.cgi?id=210777

        Reviewed by Eric Carlson.

        * Configurations/FeatureDefines.xcconfig:

2020-04-20  Ross Kirsling  <ross.kirsling@sony.com>

        Intl classes shouldn't need an m_initialized* field
        https://bugs.webkit.org/show_bug.cgi?id=210764

        Reviewed by Darin Adler.

        Existing Intl classes each have a field like m_initializedNumberFormat, but this is unnecessary on two levels:
          1. The thing that gets initialized is a unique pointer to an ICU struct, so we can check it directly.
          2. Everywhere we're checking this is redundant since we've already done the same check on the prototype side,
             therefore we can just ASSERT before using said ICU struct.

        While we're at it, clean up other stuff like:
          - Move stuff that doesn't need to be part of the class to the CPP file (e.g. UFieldPositionIteratorDeleter).
          - Merge createCollator into initializeCollator (seems like this is probably the oldest code in this space).

        * runtime/IntlCollator.cpp:
        (JSC::IntlCollator::initializeCollator):
        (JSC::IntlCollator::compareStrings):
        (JSC::IntlCollator::resolvedOptions):
        (JSC::IntlCollator::createCollator): Deleted.
        * runtime/IntlCollator.h:
        * runtime/IntlDateTimeFormat.cpp:
        (JSC::UFieldPositionIteratorDeleter::operator() const):
        (JSC::IntlDateTimeFormat::initializeDateTimeFormat):
        (JSC::IntlDateTimeFormat::resolvedOptions):
        (JSC::IntlDateTimeFormat::format):
        (JSC::partTypeString):
        (JSC::IntlDateTimeFormat::formatToParts):
        (JSC::IntlDateTimeFormat::UFieldPositionIteratorDeleter::operator() const): Deleted.
        (JSC::IntlDateTimeFormat::partTypeString): Deleted.
        * runtime/IntlDateTimeFormat.h:
        * runtime/IntlNumberFormat.cpp:
        (JSC::UFieldPositionIteratorDeleter::operator() const):
        (JSC::IntlNumberFormatField::IntlNumberFormatField):
        (JSC::IntlNumberFormat::initializeNumberFormat):
        (JSC::IntlNumberFormat::format):
        (JSC::IntlNumberFormat::resolvedOptions):
        (JSC::partTypeString):
        (JSC::IntlNumberFormat::formatToParts):
        (JSC::IntlNumberFormat::UFieldPositionIteratorDeleter::operator() const): Deleted.
        (JSC::IntlNumberFormat::partTypeString): Deleted.
        * runtime/IntlNumberFormat.h:
        * runtime/IntlPluralRules.cpp:
        (JSC::localeData):
        (JSC::IntlPluralRules::initializePluralRules):
        (JSC::IntlPluralRules::resolvedOptions):
        (JSC::IntlPluralRules::select):
        (JSC::IntlPRInternal::localeData): Deleted.
        * runtime/IntlPluralRules.h:

2020-04-20  Keith Miller  <keith_miller@apple.com>

        FTL doesn't observe the use kind of CheckIsConstant's child1
        https://bugs.webkit.org/show_bug.cgi?id=210763

        Reviewed by Yusuke Suzuki.

        Somehow, this didn't get added when I changed CheckIsConstant and didn't show up
        when I tested r260377 because I tested in release. Fortunately, the produced
        DFG IR will be the same.

        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileCheckIsConstant):

2020-04-20  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Skip test262 for non-safe-integer range BigIntConstructor
        https://bugs.webkit.org/show_bug.cgi?id=210749

        Reviewed by Keith Miller.

        * runtime/BigIntConstructor.cpp:
        (JSC::callBigIntConstructor):

2020-04-20  Keith Miller  <keith_miller@apple.com>

        Fix CheckIsConstant for non-constant values and checking for empty
        https://bugs.webkit.org/show_bug.cgi?id=210752

        Reviewed by Saam Barati.

        We need to make sure that we only have one speculated type if our value
        is empty.

        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):

2020-04-20  Darin Adler  <darin@apple.com>

        Use #import instead of #include in Objective-C and don't use #pragma once
        https://bugs.webkit.org/show_bug.cgi?id=210724

        Reviewed by David Kilzer.

        * API/JSAPIWrapperObject.mm:
        * API/JSContext.h:
        * API/JSContext.mm:
        * API/JSScriptInternal.h:
        * API/JSValue.mm:
        * API/JSVirtualMachine.mm:
        * API/JSVirtualMachinePrivate.h:
        * API/JSWrapperMap.mm:
        * API/ObjCCallbackFunction.mm:
        * API/tests/CurrentThisInsideBlockGetterTest.mm:
        More #import, less #pragma once.

2020-04-20  Yusuke Suzuki  <ysuzuki@apple.com>

        StructuredClone algorithm should be aware of BigInt
        https://bugs.webkit.org/show_bug.cgi?id=210728

        Reviewed by Mark Lam.

        * CMakeLists.txt:
        * runtime/BigIntObject.h:
        * runtime/JSBigInt.cpp:
        (JSC::JSBigInt::digit): Deleted.
        (JSC::JSBigInt::setDigit): Deleted.
        * runtime/JSBigInt.h:
        (JSC::JSBigInt::digit):
        (JSC::JSBigInt::setDigit):

2020-04-19  Ross Kirsling  <ross.kirsling@sony.com>

        [ECMA-402] Intl.RelativeTimeFormat missing in WebKit
        https://bugs.webkit.org/show_bug.cgi?id=209770

        Reviewed by Darin Adler.

        This patch implements the recent ECMA-402 feature Intl.RelativeTimeFormat.

        RelativeTimeFormat has format / formatToParts functions like NumberFormat / DateTimeFormat
        and is used to turn a number and unit into a formatted relative time string, e.g.:

          new Intl.RelativeTimeFormat('en').format(10, 'day')
          > 'in 10 days'

          new Intl.RelativeTimeFormat('en', { numeric: 'auto' }).format(0, 'day')
          > 'today'

        Implementation of RelativeTimeFormat#formatToParts makes direct use of NumberFormat#formatToParts,
        as the relative time string consists of at most one formatted number with optional literal text on either side.

        This feature is runtime-guarded by the `useIntlRelativeTimeFormat` option.

        * CMakeLists.txt:
        * DerivedSources-input.xcfilelist:
        * DerivedSources-output.xcfilelist:
        * DerivedSources.make:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * Sources.txt:
        * runtime/CommonIdentifiers.h:
        * runtime/IntlRelativeTimeFormat.cpp: Added.
        * runtime/IntlRelativeTimeFormat.h: Added.
        * runtime/IntlRelativeTimeFormatConstructor.cpp: Added.
        * runtime/IntlRelativeTimeFormatConstructor.h: Added.
        * runtime/IntlRelativeTimeFormatPrototype.cpp: Added.
        * runtime/IntlRelativeTimeFormatPrototype.h: Added.
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        (JSC::JSGlobalObject::visitChildren):
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::relativeTimeFormatStructure):
        * runtime/OptionsList.h:
        * runtime/VM.cpp:
        (JSC::VM::VM):
        * runtime/VM.h:
        Add feature and runtime option.

        * runtime/IntlDateTimeFormat.cpp:
        (JSC::IntlDateTimeFormat::formatToParts):
        * runtime/IntlPluralRules.cpp:
        (JSC::IntlPluralRules::initializePluralRules):
        (JSC::IntlPluralRules::resolvedOptions):
        Make "type" a property name.

        * runtime/IntlNumberFormat.cpp:
        (JSC::IntlNumberFormat::initializeNumberFormat):
        (JSC::IntlNumberFormat::resolvedOptions):
        (JSC::IntlNumberFormat::formatToPartsInternal):
        (JSC::IntlNumberFormat::formatToParts):
        * runtime/IntlNumberFormat.h:
        Factor out formatToPartsInternal so that RelativeTimeFormat can use it with its own UNumberFormat.
        (This logic is too complicated to duplicate; it's because ICU won't split, e.g., "10,000" into parts for us.)

        * runtime/IntlObject.cpp:
        (JSC::IntlObject::IntlObject):
        (JSC::IntlObject::create):
        (JSC::IntlObject::finishCreation):
        (JSC::intlAvailableLocales):
        (JSC::intlCollatorAvailableLocales):
        (JSC::isUnicodeLocaleIdentifierType):
        (JSC::supportedLocales):
        (JSC::intlDateTimeFormatAvailableLocales): Deleted.
        (JSC::intlNumberFormatAvailableLocales): Deleted.
        * runtime/IntlObject.h:
        (JSC::intlDateTimeFormatAvailableLocales):
        (JSC::intlNumberFormatAvailableLocales):
        (JSC::intlPluralRulesAvailableLocales):
        (JSC::intlRelativeTimeFormatAvailableLocales):
        Perform three corrections for Intl classes:
          1. Collator should be the only class with unique "available locales".
             [unum|udat]_getAvailable exist but they've deferred to uloc_getAvailable for 20 years.
          2. isUnicodeLocaleIdentifierType isn't just `alphanum{3,8}` but rather `alphanum{3,8} (sep alphanum{3,8})*`.
             This is my own mistake from r239941.
          3. supportedLocalesOf entries should not be frozen.
             Changed in https://github.com/tc39/ecma402/pull/278.

        * tools/JSDollarVM.cpp:
        (JSC::functionICUVersion):
        (JSC::JSDollarVM::finishCreation):
        Add $vm.icuVersion so that we can add per-line skips to stress tests.

2020-04-19  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] SlowPathCall is not supported by callOperation in Windows
        https://bugs.webkit.org/show_bug.cgi?id=210727

        Reviewed by Ross Kirsling.

        In Windows, SlowPathCall should be handled by JITSlowPathCall, otherwise, stack is not correctly allocated.

        * jit/JITCall.cpp:
        (JSC::JIT::emit_op_iterator_open):
        (JSC::JIT::emit_op_iterator_next):
        * jit/SlowPathCall.h:
        (JSC::JITSlowPathCall::call):

2020-04-19  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Enable BigInt
        https://bugs.webkit.org/show_bug.cgi?id=210726

        Reviewed by Mark Lam.

        * runtime/OptionsList.h:

2020-04-19  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] LLInt slow path call should not have third argument
        https://bugs.webkit.org/show_bug.cgi?id=210721

        Reviewed by Mark Lam.

        LLInt callSlowPath does not work with third argument in Windows, CLoop etc. LLInt slow-path should not take third argument,
        instead, use `bytecode.metadata(...)` to get metadata.

        * jit/JITCall.cpp:
        (JSC::JIT::emit_op_iterator_open):
        (JSC::JIT::emit_op_iterator_next):
        * llint/LowLevelInterpreter64.asm:
        * runtime/CommonSlowPaths.cpp:
        (JSC::iterator_open_try_fast):
        (JSC::SLOW_PATH_DECL):
        (JSC::iterator_next_try_fast):
        (JSC::iterator_open_try_fast_narrow): Deleted.
        (JSC::iterator_open_try_fast_wide16): Deleted.
        (JSC::iterator_open_try_fast_wide32): Deleted.
        (JSC::iterator_next_try_fast_narrow): Deleted.
        (JSC::iterator_next_try_fast_wide16): Deleted.
        (JSC::iterator_next_try_fast_wide32): Deleted.
        * runtime/CommonSlowPaths.h:

2020-04-19  Mark Lam  <mark.lam@apple.com>

        Fix missing exception checks and handling in JSC APIs.
        https://bugs.webkit.org/show_bug.cgi?id=210715
        <rdar://problem/61599658>

        Reviewed by Saam Barati.

        * API/APICallbackFunction.h:
        (JSC::APICallbackFunction::call):
        - We should return early if an exception was thrown.  We should not be using the
          result in any way since we cannot rely on it having any sane value.
        (JSC::APICallbackFunction::construct):
        - For consistency, also return an undefined here when an exception was thrown.

        * API/JSCallbackObjectFunctions.h:
        (JSC::JSCallbackObject<Parent>::construct):
        (JSC::JSCallbackObject<Parent>::call):
        - Return an undefined if an exception was thrown.  Don't return the potentially
          garbage result value.  Who knows what the client code will do with it.  Returning
          an undefined here makes the code more robust.

        * API/JSObjectRef.cpp:
        (JSObjectGetProperty):
        (JSObjectHasPropertyForKey):
        (JSObjectGetPropertyForKey):
        (JSObjectDeletePropertyForKey):
        (JSObjectGetPropertyAtIndex):
        (JSObjectDeleteProperty):
        - Explicitly return a nullptr if an exception was thrown.  The toRef() on the
          result that follows the exception check may or may not return a nullptr
          (also see toRef(JSC::VM& vm, JSC::JSValue v) for !CPU(ADDRESS64)).

        * API/JSValueRef.cpp:
        (JSValueIsEqual):
        (JSValueIsInstanceOfConstructor):
        - For consistency, make these return false if an exception is thrown.

        * API/ObjCCallbackFunction.mm:
        (JSC::objCCallbackFunctionCallAsFunction):
        (JSC::objCCallbackFunctionCallAsConstructor):
        (JSC::ObjCCallbackFunctionImpl::call):
        - Add some assertions and return early if an exception was thrown.

2020-04-18  Keith Miller  <keith_miller@apple.com>

        Fix CLoop build for iterator opcodes
        https://bugs.webkit.org/show_bug.cgi?id=210709

        Reviewed by Robin Morisset.

        We need to add a default paramater for the metadata pointer
        in the CLoop build. Additionally, the helper declarations need
        to be in the various slow path header files. Lastly we need
        opcode labels for our new JS call return points.

        * bytecode/BytecodeList.rb:
        * llint/LLIntSlowPaths.cpp:
        * llint/LLIntSlowPaths.h:
        * runtime/CommonSlowPaths.h:

2020-04-18  Robin Morisset  <rmorisset@apple.com>

        Support an inlined representation in JSValue of small BigInts ("BigInt32")
        https://bugs.webkit.org/show_bug.cgi?id=206182

        Reviewed by Yusuke Suzuki.

        This patch attempts to optimize the performance of BigInts, when they are small (32 bit or less).
        It works by inlining them into JSValue on 64-bit platforms, avoiding the allocation of a JSBigInt.
        The bit pattern we use is 0000:XXXX:XXXX:0012
        This representation works because of the following things:
        - It cannot be confused with a Double or Integer thanks to the top bits
        - It cannot be confused with a pointer to a Cell, thanks to bit 1 which is set to true
        - It cannot be confused with a pointer to wasm thanks to bit 0 which is set to false
        - It cannot be confused with true/false because bit 2 is set to false
        - It cannot be confused for null/undefined because bit 4 is set to true

        This entire change is gated by USE(BIGINT32), to make it easier to disable if it turns out to have bugs.
        It should also make it much easier to verify if a given bug comes from it or from something else.

        Note that in this patch we create BigInt32s when parsing small BigInt constants, and most operations (e.g. Add or BitOr) produce a BigInt32 if both of their operands are BigInt32,
        but we don't produce a BigInt32 from for example the substraction/division of two large heap-allocated JSBigInts, even if the result fits in 32-bits.
        As a result, small BigInts can now either be heap-allocated or inlined in the JSValue.

        This patch includes a significant refactor of various slow paths, which are now grouped together in Operations.h
        Because this increased the size of Operations.h significantly, I split the parts of Operations.h which are only used by the GC into Scribble.h, to avoid bloating compile times.

        In the DFG and FTL we now have 3 UseKinds for BigInts: HeapBigIntUse, BigInt32Use and AnyBigIntUse.
        The latter is useful when we know that we are receiving BigInts, but speculation indicates a mix of heap-allocated and small (inlined) big-ints.

        Unfortunately, a naive implementation of this patch significantly regresses the performance of StrictEq (and its variants), as it is no longer true that a cell and a non-cell cannot be equal.
        Before this patch, the code was jumping to a slow path if either:
        - at least one operand is a double
        - or both operands are cells
        Now, it also needs to jump to the slow path if at least one is a cell.
        To recover this performance cost, I significantly rewrote this code, from
          if (left is Cell && right is Cell) {
            if (left == right)
              return true;
            goto slowPath;
          }
          if (! left is Int32) {
            if (left is Number)
              goto slowPath
          }
          if (! right is Int32) {
            if (right is Number)
              goto slowPath
          }
          return left == right
        To the following:
          if (left is Double || right is Double)
            goto slowPath
          if (left == right)
            return true;
          if (left is Cell || right is Cell)
            goto slowPath
          return false;
        I believe this to be faster than just replacing (left is Cell && right is Cell) by an ||, because I found a bit-trick to check (left is Double || right is Double) which should help reduce the pressure on the branch predictor.
        Early JetStream2 tests appear to confirm that this patch is roughly neutral while it was a 0.5% regression before I used this trick, but the numbers are still too noisy, I plan to do more measurements before landing this patch.

        I don't yet have performance numbers for this patch on a BigInt benchmark, I will get such numbers before trying to land it, but I'd like some review in the meantime.

        * JavaScriptCore.xcodeproj/project.pbxproj:
        * assembler/X86Assembler.h:
        (JSC::X86Assembler::X86InstructionFormatter::SingleInstructionBufferWriter::memoryModRM):
        * bytecode/ArithProfile.cpp:
        (JSC::ArithProfile<BitfieldType>::emitObserveResult):
        (JSC::ArithProfile<BitfieldType>::shouldEmitSetBigInt32 const):
        (JSC::ArithProfile<BitfieldType>::shouldEmitSetHeapBigInt const):
        (JSC::ArithProfile<BitfieldType>::emitSetHeapBigInt const):
        (JSC::ArithProfile<BitfieldType>::emitSetBigInt32 const):
        (WTF::printInternal):
        * bytecode/ArithProfile.h:
        (JSC::ObservedResults::didObserveNonInt32):
        (JSC::ObservedResults::didObserveBigInt):
        (JSC::ObservedResults::didObserveHeapBigInt):
        (JSC::ObservedResults::didObserveBigInt32):
        (JSC::ArithProfile::didObserveHeapBigInt const):
        (JSC::ArithProfile::didObserveBigInt32 const):
        (JSC::ArithProfile::setObservedHeapBigInt):
        (JSC::ArithProfile::setObservedBigInt32):
        (JSC::ArithProfile::observeResult):
        * bytecode/BytecodeList.rb:
        * bytecode/BytecodeLivenessAnalysisInlines.h:
        * bytecode/BytecodeUseDef.cpp:
        (JSC::computeUsesForBytecodeIndexImpl):
        (JSC::computeDefsForBytecodeIndexImpl):
        * bytecode/CodeBlock.cpp:
        * bytecode/DataFormat.h:
        * bytecode/MethodOfGettingAValueProfile.cpp:
        (JSC::MethodOfGettingAValueProfile::emitReportValue const):
        * bytecode/MethodOfGettingAValueProfile.h:
        * bytecode/SpeculatedType.cpp:
        (JSC::dumpSpeculation):
        (JSC::speculationFromClassInfo):
        (JSC::speculationFromStructure):
        (JSC::speculationFromValue):
        (JSC::speculationFromJSType):
        (JSC::leastUpperBoundOfStrictlyEquivalentSpeculations):
        * bytecode/SpeculatedType.h:
        (JSC::isBigInt32Speculation):
        (JSC::isHeapBigIntSpeculation):
        (JSC::isBigIntSpeculation):
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitEqualityOpImpl):
        (JSC::BytecodeGenerator::addBigIntConstant):
        * bytecompiler/BytecodeGenerator.h:
        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::isToThisAnIdentity):
        (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/DFGConstantFoldingPhase.cpp:
        (JSC::DFG::ConstantFoldingPhase::foldConstants):
        * dfg/DFGDoesGC.cpp:
        (JSC::DFG::doesGC):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        (JSC::DFG::FixupPhase::fixupToThis):
        (JSC::DFG::FixupPhase::fixupToNumeric):
        (JSC::DFG::FixupPhase::observeUseKindOnNode):
        (JSC::DFG::FixupPhase::fixupCompareStrictEqAndSameValue):
        * dfg/DFGMayExit.cpp:
        * dfg/DFGNode.h:
        (JSC::DFG::Node::shouldSpeculateBigInt32):
        (JSC::DFG::Node::shouldSpeculateHeapBigInt):
        * dfg/DFGNodeType.h:
        * dfg/DFGOSRExit.cpp:
        (JSC::DFG::OSRExit::compileExit):
        * dfg/DFGOSRExit.h:
        * dfg/DFGOperations.cpp:
        * dfg/DFGOperations.h:
        * dfg/DFGPredictionPropagationPhase.cpp:
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::SafeToExecuteEdge::operator()):
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compilePeepHoleBranch):
        (JSC::DFG::SpeculativeJIT::compileValueBitNot):
        (JSC::DFG::SpeculativeJIT::emitUntypedOrAnyBigIntBitOp):
        (JSC::DFG::SpeculativeJIT::compileValueBitwiseOp):
        (JSC::DFG::SpeculativeJIT::emitUntypedOrBigIntRightShiftBitOp):
        (JSC::DFG::SpeculativeJIT::compileValueLShiftOp):
        (JSC::DFG::SpeculativeJIT::compileValueBitRShift):
        (JSC::DFG::SpeculativeJIT::compileShiftOp):
        (JSC::DFG::SpeculativeJIT::compileValueAdd):
        (JSC::DFG::SpeculativeJIT::compileValueSub):
        (JSC::DFG::SpeculativeJIT::compileIncOrDec):
        (JSC::DFG::SpeculativeJIT::compileValueNegate):
        (JSC::DFG::SpeculativeJIT::compileValueMul):
        (JSC::DFG::SpeculativeJIT::compileValueDiv):
        (JSC::DFG::SpeculativeJIT::compileValueMod):
        (JSC::DFG::SpeculativeJIT::compileValuePow):
        (JSC::DFG::SpeculativeJIT::compare):
        (JSC::DFG::SpeculativeJIT::compileStrictEq):
        (JSC::DFG::SpeculativeJIT::speculateHeapBigInt):
        (JSC::DFG::SpeculativeJIT::speculate):
        (JSC::DFG::SpeculativeJIT::compileToNumeric):
        (JSC::DFG::SpeculativeJIT::compileHeapBigIntEquality):
        * dfg/DFGSpeculativeJIT.h:
        (JSC::DFG::SpeculateBigInt32Operand::SpeculateBigInt32Operand):
        (JSC::DFG::SpeculateBigInt32Operand::~SpeculateBigInt32Operand):
        (JSC::DFG::SpeculateBigInt32Operand::edge const):
        (JSC::DFG::SpeculateBigInt32Operand::node const):
        (JSC::DFG::SpeculateBigInt32Operand::gpr):
        (JSC::DFG::SpeculateBigInt32Operand::use):
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::fillJSValue):
        (JSC::DFG::SpeculativeJIT::nonSpeculativePeepholeStrictEq):
        (JSC::DFG::SpeculativeJIT::nonSpeculativeNonPeepholeStrictEq):
        (JSC::DFG::SpeculativeJIT::fillSpeculateInt32Internal):
        (JSC::DFG::SpeculativeJIT::fillSpeculateCell):
        (JSC::DFG::SpeculativeJIT::fillSpeculateBoolean):
        (JSC::DFG::SpeculativeJIT::speculateBigInt32):
        (JSC::DFG::SpeculativeJIT::speculateAnyBigInt):
        (JSC::DFG::SpeculativeJIT::fillSpeculateBigInt32):
        (JSC::DFG::SpeculativeJIT::compileBigInt32Compare):
        (JSC::DFG::SpeculativeJIT::compilePeepHoleBigInt32Branch):
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGStrengthReductionPhase.cpp:
        (JSC::DFG::StrengthReductionPhase::handleNode):
        * dfg/DFGUseKind.cpp:
        (WTF::printInternal):
        * dfg/DFGUseKind.h:
        (JSC::DFG::typeFilterFor):
        (JSC::DFG::isCell):
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLCommonValues.cpp:
        (JSC::FTL::CommonValues::initializeConstants):
        * ftl/FTLCommonValues.h:
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileNode):
        (JSC::FTL::DFG::LowerDFGToB3::compileValueAdd):
        (JSC::FTL::DFG::LowerDFGToB3::compileValueSub):
        (JSC::FTL::DFG::LowerDFGToB3::compileValueMul):
        (JSC::FTL::DFG::LowerDFGToB3::compileBinaryMathIC):
        (JSC::FTL::DFG::LowerDFGToB3::compileValueDiv):
        (JSC::FTL::DFG::LowerDFGToB3::compileValueMod):
        (JSC::FTL::DFG::LowerDFGToB3::compileValuePow):
        (JSC::FTL::DFG::LowerDFGToB3::compileValueBitNot):
        (JSC::FTL::DFG::LowerDFGToB3::compileValueBitAnd):
        (JSC::FTL::DFG::LowerDFGToB3::compileValueBitOr):
        (JSC::FTL::DFG::LowerDFGToB3::compileValueBitXor):
        (JSC::FTL::DFG::LowerDFGToB3::compileValueBitRShift):
        (JSC::FTL::DFG::LowerDFGToB3::compileArithBitRShift):
        (JSC::FTL::DFG::LowerDFGToB3::compileArithBitLShift):
        (JSC::FTL::DFG::LowerDFGToB3::compileValueBitLShift):
        (JSC::FTL::DFG::LowerDFGToB3::compileBitURShift):
        (JSC::FTL::DFG::LowerDFGToB3::compileToNumeric):
        (JSC::FTL::DFG::LowerDFGToB3::compileCompareEq):
        (JSC::FTL::DFG::LowerDFGToB3::compileCompareStrictEq):
        (JSC::FTL::DFG::LowerDFGToB3::compileIsBigInt):
        (JSC::FTL::DFG::LowerDFGToB3::emitBinarySnippet):
        (JSC::FTL::DFG::LowerDFGToB3::emitBinaryBitOpSnippet):
        (JSC::FTL::DFG::LowerDFGToB3::boolify):
        (JSC::FTL::DFG::LowerDFGToB3::buildTypeOf):
        (JSC::FTL::DFG::LowerDFGToB3::lowHeapBigInt):
        (JSC::FTL::DFG::LowerDFGToB3::lowBigInt32):
        (JSC::FTL::DFG::LowerDFGToB3::isBigInt32):
        (JSC::FTL::DFG::LowerDFGToB3::isNotBigInt32):
        (JSC::FTL::DFG::LowerDFGToB3::unboxBigInt32):
        (JSC::FTL::DFG::LowerDFGToB3::boxBigInt32):
        (JSC::FTL::DFG::LowerDFGToB3::isNotAnyBigInt):
        (JSC::FTL::DFG::LowerDFGToB3::speculate):
        (JSC::FTL::DFG::LowerDFGToB3::isNotHeapBigIntUnknownWhetherCell):
        (JSC::FTL::DFG::LowerDFGToB3::isNotHeapBigInt):
        (JSC::FTL::DFG::LowerDFGToB3::isHeapBigInt):
        (JSC::FTL::DFG::LowerDFGToB3::speculateHeapBigInt):
        (JSC::FTL::DFG::LowerDFGToB3::speculateHeapBigIntUnknownWhetherCell):
        (JSC::FTL::DFG::LowerDFGToB3::speculateBigInt32):
        (JSC::FTL::DFG::LowerDFGToB3::speculateAnyBigInt):
        * ftl/FTLOSRExitCompiler.cpp:
        (JSC::FTL::compileStub):
        * heap/HeapSnapshotBuilder.cpp:
        (JSC::HeapSnapshotBuilder::json):
        * heap/MarkedBlockInlines.h:
        * heap/PreciseAllocation.cpp:
        * inspector/agents/InspectorHeapAgent.cpp:
        (Inspector::InspectorHeapAgent::getPreview):
        * interpreter/Interpreter.cpp:
        (JSC::sizeOfVarargs):
        * jit/AssemblyHelpers.cpp:
        (JSC::AssemblyHelpers::emitConvertValueToBoolean):
        (JSC::AssemblyHelpers::branchIfValue):
        * jit/AssemblyHelpers.h:
        (JSC::AssemblyHelpers::branchIfBigInt32):
        (JSC::AssemblyHelpers::branchIfBigInt32KnownNotNumber):
        (JSC::AssemblyHelpers::branchIfNotBigInt32KnownNotNumber):
        (JSC::AssemblyHelpers::branchIfHeapBigInt):
        (JSC::AssemblyHelpers::branchIfNotHeapBigInt):
        (JSC::AssemblyHelpers::unboxBigInt32):
        (JSC::AssemblyHelpers::boxBigInt32):
        (JSC::AssemblyHelpers::emitTypeOf):
        * jit/JIT.cpp:
        (JSC::JIT::privateCompileMainPass):
        * jit/JIT.h:
        * jit/JITArithmetic.cpp:
        (JSC::JIT::emit_op_negate):
        (JSC::JIT::emitSlow_op_negate):
        * jit/JITOpcodes.cpp:
        (JSC::JIT::emit_op_is_big_int):
        (JSC::JIT::compileOpStrictEq):
        (JSC::JIT::compileOpStrictEqJump):
        (JSC::JIT::emit_op_to_numeric):
        * jit/JITOpcodes32_64.cpp:
        (JSC::JIT::emit_op_is_big_int):
        (JSC::JIT::emit_op_to_numeric):
        * jit/JITOperations.cpp:
        * jit/JITOperations.h:
        * llint/LLIntOfflineAsmConfig.h:
        * llint/LowLevelInterpreter.asm:
        * llint/LowLevelInterpreter64.asm:
        * parser/ParserArena.cpp:
        (JSC::IdentifierArena::makeBigIntDecimalIdentifier):
        * runtime/ArrayPrototype.cpp:
        * runtime/BigIntConstructor.cpp:
        (JSC::toBigInt):
        (JSC::callBigIntConstructor):
        * runtime/BigIntObject.cpp:
        (JSC::BigIntObject::create):
        (JSC::BigIntObject::finishCreation):
        * runtime/BigIntObject.h:
        * runtime/BigIntPrototype.cpp:
        (JSC::toThisBigIntValue):
        (JSC::bigIntProtoFuncToStringImpl):
        * runtime/CommonSlowPaths.cpp:
        (JSC::SLOW_PATH_DECL):
        (JSC::updateArithProfileForUnaryArithOp):
        (JSC::updateArithProfileForBinaryArithOp):
        * runtime/JSBigInt.cpp:
        (JSC::JSBigInt::createStructure):
        (JSC::JSBigInt::parseInt):
        (JSC::JSBigInt::stringToBigInt):
        (JSC::JSBigInt::inc):
        (JSC::JSBigInt::dec):
        (JSC::JSBigInt::bitwiseAnd):
        (JSC::JSBigInt::toStringGeneric):
        (JSC::JSBigInt::equalsToNumber):
        (JSC::JSBigInt::equalsToInt32):
        * runtime/JSBigInt.h:
        (JSC::asHeapBigInt):
        * runtime/JSCJSValue.cpp:
        (JSC::JSValue::toNumberSlowCase const):
        (JSC::JSValue::toObjectSlowCase const):
        (JSC::JSValue::toThisSlowCase const):
        (JSC::JSValue::synthesizePrototype const):
        (JSC::JSValue::dumpInContextAssumingStructure const):
        (JSC::JSValue::dumpForBacktrace const):
        (JSC::JSValue::toStringSlowCase const):
        * runtime/JSCJSValue.h:
        * runtime/JSCJSValueInlines.h:
        (JSC::JSValue::JSValue):
        (JSC::JSValue::asHeapBigInt const):
        (JSC::JSValue::isBigInt const):
        (JSC::JSValue::isHeapBigInt const):
        (JSC::JSValue::isBigInt32 const):
        (JSC::JSValue::bigInt32AsInt32 const):
        (JSC::JSValue::isPrimitive const):
        (JSC::JSValue::getPrimitiveNumber):
        (JSC::JSValue::toNumeric const):
        (JSC::JSValue::toBigIntOrInt32 const):
        (JSC::JSValue::equalSlowCaseInline):
        (JSC::JSValue::strictEqualForCells):
        (JSC::JSValue::strictEqual):
        (JSC::JSValue::pureStrictEqual):
        (JSC::JSValue::pureToBoolean const):
        * runtime/JSCell.cpp:
        (JSC::JSCell::put):
        (JSC::JSCell::putByIndex):
        (JSC::JSCell::toPrimitive const):
        (JSC::JSCell::getPrimitiveNumber const):
        (JSC::JSCell::toNumber const):
        (JSC::JSCell::toObjectSlow const):
        * runtime/JSCell.h:
        * runtime/JSCellInlines.h:
        (JSC::JSCell::isHeapBigInt const):
        (JSC::JSCell::toBoolean const):
        (JSC::JSCell::pureToBoolean const):
        * runtime/JSString.h:
        (JSC::JSValue::toBoolean const):
        * runtime/JSType.cpp:
        (WTF::printInternal):
        * runtime/JSType.h:
        * runtime/JSTypeInfo.h:
        * runtime/ObjectInitializationScope.cpp:
        * runtime/Operations.cpp:
        (JSC::jsAddSlowCase):
        (JSC::jsIsObjectTypeOrNull):
        * runtime/Operations.h:
        (JSC::compareBigIntToOtherPrimitive):
        (JSC::bigIntCompare):
        (JSC::jsLess):
        (JSC::jsLessEq):
        (JSC::arithmeticBinaryOp):
        (JSC::jsSub):
        (JSC::jsMul):
        (JSC::jsDiv):
        (JSC::jsRemainder):
        (JSC::jsPow):
        (JSC::jsInc):
        (JSC::jsDec):
        (JSC::jsBitwiseNot):
        (JSC::shift):
        (JSC::jsLShift):
        (JSC::jsRShift):
        (JSC::bitwiseBinaryOp):
        (JSC::jsBitwiseAnd):
        (JSC::jsBitwiseOr):
        (JSC::jsBitwiseXor):
        * runtime/Scribble.h: Copied from Source/JavaScriptCore/runtime/BigIntObject.h.
        (JSC::scribbleFreeCells):
        (JSC::isScribbledValue):
        (JSC::scribble):
        * runtime/StructureInlines.h:
        (JSC::prototypeForLookupPrimitiveImpl):

2020-04-18  Keith Miller  <keith_miller@apple.com>

        Unreviewed, remove commented out/dead code that didn't failed to
        get removed when landing r260323.

        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
        * runtime/CommonSlowPaths.cpp:
        (JSC::iterator_next_try_fast):

2020-04-18  Keith Miller  <keith_miller@apple.com>

        Redesign how we do for-of iteration for JSArrays
        https://bugs.webkit.org/show_bug.cgi?id=175454

        Reviewed by Filip Pizlo and Saam Barati.

        This patch intrinsics for-of iteration for JSArrays when they are
        being iterated with the built-in Symbol.iterator. We do this by
        adding two new bytecodes op_iterator_open and
        op_iterator_next. These bytecodes are essentially a fused set of
        existing bytecodes with a special case for our intrinsiced JSArray
        case. This patch only adds support for these instructions on
        64-bit.


        The op_iterator_open bytecode is semantically the same as:
        iterator = symbolIterator.@call(iterable);
        next = iterator.next;

        where iterable is the rhs of the for-of and symbolIterator is the
        result of running iterable.symbolIterator;


        The op_iterator_next bytecode is semantically the same as:
        nextResult = next.@call(iterator);
        done = nextResult.done;
        value = done ? (undefined / bottom) : nextResult.value;

        where nextResult is a temporary (the value VirtualRegister in the
        LLInt/Baseline and a tmp in the DFG).

        In order to make sure these bytecodes have the same perfomance as
        the existing bytecode sequence, we need to make sure we have the
        same profiling data and inline caching. Most of the existing
        get_by_id code assumed a particular bytecode member name was the
        same in each flavor get_by_id access. This patch adds template
        specialized functions that vend the correct
        Profile/VirtualRegister for the current bytecode/checkpoint. This
        means we can have meaningful names for our Bytecode structs and
        still use the generic functions.

        In the LLInt most of the logic for calls/get_by_id had to be
        factored into helper macros, so we could have bytecodes that are
        some combination of those.

        The trickiest part of this patch was getting the hand rolled DFG
        IR to work correctly. This is because we don't have a great way to
        express large chucks of DFG graph that doesn't involve manually
        tracking all the DFG's invariants. Such as:

        1) Flushing/Phantoming values at the end of each block.
        2) Rolling forwards and backwards the BytecodeIndex when switching
           blocks.
        3) Remembering to GetLocal each variable at the top of every block.
        4) Ensuring that the JSValue stored to the op_iterator_next.m_value
           local does not cause us to OSR exit at the set local.

        (4) is handled by a new function, bottomValueMatchingSpeculation,
        on DFGGraph that produces a FrozenValue that is roughly the bottom
        for a given speculated type. In a future patch we should make this
        more complete, probably by adding a VM::bottomCellForSetLocal that
        prediction propagation and AI know how treat as a true bottom
        value. See: https://bugs.webkit.org/show_bug.cgi?id=210694

        Lastly, this patch changes the DFG NodeType, CheckCell to be
        CheckIsConstant.  CheckIsConstant is equivalent to the == operator
        on JSValue where it just checks the register values are the
        same. In order to keep the same perf that we had for CheckCell,
        CheckIsConstant supports CellUse.

        * CMakeLists.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:
        * assembler/MacroAssemblerARM64.h:
        (JSC::MacroAssemblerARM64::or8):
        (JSC::MacroAssemblerARM64::store8):
        * assembler/MacroAssemblerX86_64.h:
        (JSC::MacroAssemblerX86_64::or8):
        * bytecode/ArrayProfile.h:
        (JSC::ArrayProfile::observeStructureID):
        (JSC::ArrayProfile::observeStructure):
        * bytecode/BytecodeList.rb:
        * bytecode/BytecodeLivenessAnalysis.cpp:
        (JSC::tmpLivenessForCheckpoint):
        * bytecode/BytecodeOperandsForCheckpoint.h: Added.
        (JSC::arrayProfileForImpl):
        (JSC::hasArrayProfileFor):
        (JSC::arrayProfileFor):
        (JSC::valueProfileForImpl):
        (JSC::hasValueProfileFor):
        (JSC::valueProfileFor):
        (JSC::destinationFor):
        (JSC::calleeFor):
        (JSC::argumentCountIncludingThisFor):
        (JSC::stackOffsetInRegistersForCall):
        (JSC::callLinkInfoFor):
        * bytecode/BytecodeUseDef.cpp:
        (JSC::computeUsesForBytecodeIndexImpl):
        (JSC::computeDefsForBytecodeIndexImpl):
        * bytecode/CallLinkInfo.cpp:
        (JSC::CallLinkInfo::callTypeFor):
        * bytecode/CallLinkStatus.cpp:
        (JSC::CallLinkStatus::computeFromLLInt):
        * bytecode/CodeBlock.cpp:
        (JSC::CodeBlock::finishCreation):
        (JSC::CodeBlock::finalizeLLIntInlineCaches):
        (JSC::CodeBlock::tryGetValueProfileForBytecodeIndex):
        * bytecode/CodeBlock.h:
        (JSC::CodeBlock::instructionAt const):
        * bytecode/CodeBlockInlines.h:
        (JSC::CodeBlock::forEachValueProfile):
        (JSC::CodeBlock::forEachArrayProfile):
        * bytecode/GetByStatus.cpp:
        (JSC::GetByStatus::computeFromLLInt):
        * bytecode/Instruction.h:
        (JSC::BaseInstruction::width const):
        (JSC::BaseInstruction::hasCheckpoints const):
        (JSC::BaseInstruction::asKnownWidth const):
        (JSC::BaseInstruction::wide16 const):
        (JSC::BaseInstruction::wide32 const):
        * bytecode/InstructionStream.h:
        * bytecode/IterationModeMetadata.h: Copied from Source/JavaScriptCore/bytecode/SuperSampler.h.
        * bytecode/LLIntPrototypeLoadAdaptiveStructureWatchpoint.cpp:
        (JSC::LLIntPrototypeLoadAdaptiveStructureWatchpoint::fireInternal):
        (JSC::LLIntPrototypeLoadAdaptiveStructureWatchpoint::clearLLIntGetByIdCache):
        * bytecode/LLIntPrototypeLoadAdaptiveStructureWatchpoint.h:
        * bytecode/Opcode.h:
        * bytecode/SpeculatedType.h:
        (JSC::isSubtypeSpeculation):
        (JSC::speculationContains):
        * bytecode/SuperSampler.h:
        (JSC::SuperSamplerScope::release):
        * bytecompiler/BytecodeGenerator.cpp:
        (JSC::BytecodeGenerator::emitGenericEnumeration):
        (JSC::BytecodeGenerator::emitEnumeration):
        (JSC::BytecodeGenerator::emitIsEmpty):
        (JSC::BytecodeGenerator::emitIteratorOpen):
        (JSC::BytecodeGenerator::emitIteratorNext):
        (JSC::BytecodeGenerator::emitGetGenericIterator):
        (JSC::BytecodeGenerator::emitIteratorGenericNext):
        (JSC::BytecodeGenerator::emitIteratorGenericNextWithValue):
        (JSC::BytecodeGenerator::emitIteratorGenericClose):
        (JSC::BytecodeGenerator::emitGetAsyncIterator):
        (JSC::BytecodeGenerator::emitDelegateYield):
        (JSC::BytecodeGenerator::emitIteratorNextWithValue): Deleted.
        (JSC::BytecodeGenerator::emitIteratorClose): Deleted.
        (JSC::BytecodeGenerator::emitGetIterator): Deleted.
        * bytecompiler/BytecodeGenerator.h:
        * bytecompiler/NodesCodegen.cpp:
        (JSC::ArrayPatternNode::bindValue const):
        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::forAllValues):
        * dfg/DFGAtTailAbstractState.h:
        (JSC::DFG::AtTailAbstractState::size const):
        (JSC::DFG::AtTailAbstractState::numberOfTmps const):
        (JSC::DFG::AtTailAbstractState::atIndex):
        (JSC::DFG::AtTailAbstractState::tmp):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::progressToNextCheckpoint):
        (JSC::DFG::ByteCodeParser::get):
        (JSC::DFG::ByteCodeParser::set):
        (JSC::DFG::ByteCodeParser::jsConstant):
        (JSC::DFG::ByteCodeParser::weakJSConstant):
        (JSC::DFG::ByteCodeParser::addCall):
        (JSC::DFG::ByteCodeParser::allocateUntargetableBlock):
        (JSC::DFG::ByteCodeParser::handleCall):
        (JSC::DFG::ByteCodeParser::emitFunctionChecks):
        (JSC::DFG::ByteCodeParser::inlineCall):
        (JSC::DFG::ByteCodeParser::handleCallVariant):
        (JSC::DFG::ByteCodeParser::handleVarargsInlining):
        (JSC::DFG::ByteCodeParser::handleInlining):
        (JSC::DFG::ByteCodeParser::handleMinMax):
        (JSC::DFG::ByteCodeParser::handleIntrinsicCall):
        (JSC::DFG::ByteCodeParser::handleDOMJITCall):
        (JSC::DFG::ByteCodeParser::handleIntrinsicGetter):
        (JSC::DFG::ByteCodeParser::handleDOMJITGetter):
        (JSC::DFG::ByteCodeParser::handleModuleNamespaceLoad):
        (JSC::DFG::ByteCodeParser::handleTypedArrayConstructor):
        (JSC::DFG::ByteCodeParser::handleConstantInternalFunction):
        (JSC::DFG::ByteCodeParser::handleGetById):
        (JSC::DFG::ByteCodeParser::parseBlock):
        (JSC::DFG::ByteCodeParser::InlineStackEntry::InlineStackEntry):
        (JSC::DFG::ByteCodeParser::handlePutByVal):
        (JSC::DFG::ByteCodeParser::handleCreateInternalFieldObject):
        (JSC::DFG::ByteCodeParser::parse):
        * dfg/DFGCFGSimplificationPhase.cpp:
        (JSC::DFG::CFGSimplificationPhase::keepOperandAlive):
        (JSC::DFG::CFGSimplificationPhase::jettisonBlock):
        (JSC::DFG::CFGSimplificationPhase::mergeBlocks):
        * dfg/DFGCapabilities.cpp:
        (JSC::DFG::capabilityLevel):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGConstantFoldingPhase.cpp:
        (JSC::DFG::ConstantFoldingPhase::foldConstants):
        * dfg/DFGDoesGC.cpp:
        (JSC::DFG::doesGC):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        (JSC::DFG::FixupPhase::addStringReplacePrimordialChecks):
        * dfg/DFGForAllKills.h:
        (JSC::DFG::forAllKilledOperands):
        * dfg/DFGGraph.cpp:
        (JSC::DFG::Graph::bottomValueMatchingSpeculation):
        * dfg/DFGGraph.h:
        * dfg/DFGInPlaceAbstractState.cpp:
        (JSC::DFG::InPlaceAbstractState::beginBasicBlock):
        (JSC::DFG::InPlaceAbstractState::initialize):
        (JSC::DFG::InPlaceAbstractState::endBasicBlock):
        (JSC::DFG::InPlaceAbstractState::merge):
        * dfg/DFGInPlaceAbstractState.h:
        (JSC::DFG::InPlaceAbstractState::size const):
        (JSC::DFG::InPlaceAbstractState::numberOfTmps const):
        (JSC::DFG::InPlaceAbstractState::atIndex):
        (JSC::DFG::InPlaceAbstractState::operand):
        (JSC::DFG::InPlaceAbstractState::local):
        (JSC::DFG::InPlaceAbstractState::argument):
        (JSC::DFG::InPlaceAbstractState::variableAt): Deleted.
        * dfg/DFGLazyJSValue.h:
        (JSC::DFG::LazyJSValue::speculatedType const):
        * dfg/DFGNode.h:
        (JSC::DFG::Node::hasConstant):
        (JSC::DFG::Node::hasCellOperand):
        * dfg/DFGNodeType.h:
        * dfg/DFGOSRExitCompilerCommon.cpp:
        (JSC::DFG::callerReturnPC):
        * dfg/DFGPredictionPropagationPhase.cpp:
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileCheckIsConstant):
        (JSC::DFG::SpeculativeJIT::compileCheckCell): Deleted.
        * dfg/DFGSpeculativeJIT.h:
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGValidate.cpp:
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileNode):
        (JSC::FTL::DFG::LowerDFGToB3::compileCheckIsConstant):
        (JSC::FTL::DFG::LowerDFGToB3::compileCheckCell): Deleted.
        * generator/DSL.rb:
        * generator/Metadata.rb:
        * generator/Section.rb:
        * jit/JIT.cpp:
        (JSC::JIT::privateCompileMainPass):
        (JSC::JIT::privateCompileSlowCases):
        * jit/JIT.h:
        * jit/JITCall.cpp:
        (JSC::JIT::emitPutCallResult):
        (JSC::JIT::compileSetupFrame):
        (JSC::JIT::compileOpCall):
        (JSC::JIT::emit_op_iterator_open):
        (JSC::JIT::emitSlow_op_iterator_open):
        (JSC::JIT::emit_op_iterator_next):
        (JSC::JIT::emitSlow_op_iterator_next):
        * jit/JITCall32_64.cpp:
        (JSC::JIT::emit_op_iterator_open):
        (JSC::JIT::emitSlow_op_iterator_open):
        (JSC::JIT::emit_op_iterator_next):
        (JSC::JIT::emitSlow_op_iterator_next):
        * jit/JITInlines.h:
        (JSC::JIT::updateTopCallFrame):
        (JSC::JIT::advanceToNextCheckpoint):
        (JSC::JIT::emitJumpSlowToHotForCheckpoint):
        (JSC::JIT::emitValueProfilingSite):
        * jit/JITOperations.cpp:
        * jit/JITOperations.h:
        * llint/LLIntSlowPaths.cpp:
        (JSC::LLInt::setupGetByIdPrototypeCache):
        (JSC::LLInt::performLLIntGetByID):
        (JSC::LLInt::LLINT_SLOW_PATH_DECL):
        (JSC::LLInt::genericCall):
        (JSC::LLInt::handleIteratorOpenCheckpoint):
        (JSC::LLInt::handleIteratorNextCheckpoint):
        (JSC::LLInt::slow_path_checkpoint_osr_exit):
        (JSC::LLInt::llint_dump_value):
        * llint/LowLevelInterpreter.asm:
        * llint/LowLevelInterpreter32_64.asm:
        * llint/LowLevelInterpreter64.asm:
        * offlineasm/transform.rb:
        * runtime/CommonSlowPaths.cpp:
        (JSC::iterator_open_try_fast):
        (JSC::iterator_open_try_fast_narrow):
        (JSC::iterator_open_try_fast_wide16):
        (JSC::iterator_open_try_fast_wide32):
        (JSC::iterator_next_try_fast):
        (JSC::iterator_next_try_fast_narrow):
        (JSC::iterator_next_try_fast_wide16):
        (JSC::iterator_next_try_fast_wide32):
        * runtime/CommonSlowPaths.h:
        * runtime/Intrinsic.cpp:
        (JSC::interationKindForIntrinsic):
        * runtime/Intrinsic.h:
        * runtime/JSArrayIterator.h:
        * runtime/JSCJSValue.h:
        * runtime/JSCJSValueInlines.h:
        (JSC::JSValue::isCallable const):
        * runtime/JSCast.h:
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::arrayProtoValuesFunctionConcurrently const):
        * runtime/OptionsList.h:
        * runtime/Structure.cpp:
        (JSC::Structure::dumpBrief const):

2020-04-18  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Replace DFG NewPromise with NewInternalFieldObject
        https://bugs.webkit.org/show_bug.cgi?id=210687

        Reviewed by Saam Barati.

        The feature of DFG::NewPromise can be implemented completely with DFG::NewInternalFieldObject. This reduces code duplication, and furthermore,
        this offers Object Allocation Sinking support for free. This patch replaces DFG::NewPromise with DFG::NewInternalFieldObject and remove DFG::NewPromise
        completely.

        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::parseBlock):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGClobbersExitState.cpp:
        (JSC::DFG::clobbersExitState):
        * dfg/DFGConstantFoldingPhase.cpp:
        (JSC::DFG::ConstantFoldingPhase::foldConstants):
        * dfg/DFGDoesGC.cpp:
        (JSC::DFG::doesGC):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGNode.h:
        (JSC::DFG::Node::convertToNewInternalFieldObject):
        (JSC::DFG::Node::convertToNewInternalFieldObjectWithInlineFields):
        (JSC::DFG::Node::hasIsInternalPromise):
        (JSC::DFG::Node::hasStructure):
        (JSC::DFG::Node::convertToNewPromise): Deleted.
        * dfg/DFGNodeType.h:
        * dfg/DFGObjectAllocationSinkingPhase.cpp:
        * dfg/DFGPredictionPropagationPhase.cpp:
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileNewInternalFieldObject):
        (JSC::DFG::SpeculativeJIT::compileNewPromise): Deleted.
        * dfg/DFGSpeculativeJIT.h:
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGStoreBarrierInsertionPhase.cpp:
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileNode):
        (JSC::FTL::DFG::LowerDFGToB3::compileNewInternalFieldObject):
        (JSC::FTL::DFG::LowerDFGToB3::compileMaterializeNewInternalFieldObject):
        (JSC::FTL::DFG::LowerDFGToB3::compileNewPromise): Deleted.
        * ftl/FTLOperations.cpp:
        (JSC::FTL::operationPopulateObjectInOSR):
        (JSC::FTL::operationMaterializeObjectInOSR):
        * runtime/JSInternalPromise.cpp:
        (JSC::JSInternalPromise::createWithInitialValues):
        * runtime/JSInternalPromise.h:
        * runtime/JSPromise.cpp:
        (JSC::JSPromise::createWithInitialValues):
        (JSC::JSPromise::finishCreation):
        (JSC::JSPromise::status const):
        (JSC::JSPromise::result const):
        (JSC::JSPromise::flags const):
        (JSC::JSPromise::resolve):
        (JSC::JSPromise::reject):
        (JSC::JSPromise::rejectAsHandled):
        * runtime/JSPromise.h:
        (JSC::JSPromise::initialValues):
        (JSC::JSPromise::internalField const):
        (JSC::JSPromise::internalField):

2020-04-18  Yusuke Suzuki  <ysuzuki@apple.com>

        Unreviewed, build fix for ARM64E after r260310
        https://bugs.webkit.org/show_bug.cgi?id=207330

        r260310 uses undefined function Instruction.cloneWithNewOperands in arm64e.rb and throws an error.
        This patch calls `node.cloneWithNewOperands`.

        * offlineasm/arm64e.rb:

2020-04-18  Alexey Shvayka  <shvaikalesh@gmail.com>

        RegExp.prototype[@@search] should use SameValue
        https://bugs.webkit.org/show_bug.cgi?id=173226

        Reviewed by Yusuke Suzuki.

        This change exposes Object.is implementation as link-time-constant @sameValue and utilizes
        it in RegExp.prototype[@@search] per spec [1], aligning JSC with V8 and SpiderMonkey.

        [1]: https://tc39.es/ecma262/#sec-regexp.prototype-@@search (steps 5, 8)

        * builtins/BuiltinNames.h:
        * builtins/RegExpPrototype.js:
        (Symbol.search):
        * bytecode/LinkTimeConstant.h:
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        * runtime/ObjectConstructor.cpp:
        * runtime/ObjectConstructor.h:

2020-04-18  Angelos Oikonomopoulos  <angelos@igalia.com>

        Fix code origin when lowering offlineasm instructions on MIPS/ARM64E
        https://bugs.webkit.org/show_bug.cgi?id=207330

        Reviewed by Mark Lam.

        Instruction operands are mapped to RegisterID in RegisterID.forName
        and the operation is memoized. Therefore, we can't use the codeOrigin
        of the operand at that point. Use the codeOrigin of the original
        instruction instead.

        * offlineasm/arm64e.rb:
        * offlineasm/ast.rb:
        * offlineasm/mips.rb:
        * offlineasm/risc.rb:

2020-04-18  Angelos Oikonomopoulos  <angelos@igalia.com>

        REGRESSION(r260246): It broke build on MIPS32 
        https://bugs.webkit.org/show_bug.cgi?id=210665

        Reviewed by Aakash Jain.

        The mnemonic for 'store halfword' is 'sh', not 'shv'. This appears to
        be a typo in a path that was never exercised.

        Exposed by r260246; riscLowerMisplacedAddresses now calls into
        riscAsRegisters with an 'h' suffix, which results in a 'storeh'
        instruction. The storeh is then lowered to the non-existent 'shv'.

        * offlineasm/mips.rb:

2020-04-17  Commit Queue  <commit-queue@webkit.org>

        Unreviewed, reverting r260279.
        https://bugs.webkit.org/show_bug.cgi?id=210678

        Throwing error would be more efficient, having a generic code
        is still worth doing (Requested by yusukesuzuki on #webkit).

        Reverted changeset:

        "[JSC] We do not need to have exit-check for Map/Set iterator
        functions"
        https://bugs.webkit.org/show_bug.cgi?id=210667
        https://trac.webkit.org/changeset/260279

2020-04-17  Saam Barati  <sbarati@apple.com>

        GetTypedArrayByteOffset is broken on arm64e
        https://bugs.webkit.org/show_bug.cgi?id=210631

        Reviewed by Mark Lam.

        The vector of JSArrayBufferView is signed even when null on arm64e.  However, we were
        comparing against zero, which is wrong. This patch changes it so we do the right thing
        and instead compare against whatever constant (ptr=nullptr,size=0) signs as.

        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileGetTypedArrayByteOffset):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileGetTypedArrayByteOffset):
        * runtime/CagedBarrierPtr.h:
        (JSC::CagedBarrierPtr::rawBits const):
        * runtime/JSArrayBufferView.h:
        (JSC::JSArrayBufferView::nullVectorPtr):

2020-04-17  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] We do not need to have exit-check for Map/Set iterator functions
        https://bugs.webkit.org/show_bug.cgi?id=210667

        Reviewed by Michael Saboff.

        If the intrinsic's DFG node does not support general cases, we should check exit-frequency to avoid exit-recompile loop.
        However, Map/Set iterator creation functions (values, keys, entries) always require Map / Set types. And throwing an error
        when this is not met. So, the current DFG nodes for these intrinsic supports all the cases except for the case throwing an
        error, and error will exit anyway. So we do not need to have this exit-frequency guard here.

        This path is already tested by map-iterator-check-before-fail.js / set-iterator-check-before-fail.js.

        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::handleIntrinsicCall):

2020-04-17  Devin Rousso  <drousso@apple.com>

        Rename NullishEq / NULLISHEQUAL to CoalesceEq / COALESCEEQUAL to match the spec
        https://bugs.webkit.org/show_bug.cgi?id=210663

        Reviewed by Ross Kirsling.

        * bytecompiler/NodesCodegen.cpp:
        (JSC::emitShortCircuitAssignment):
        * parser/ASTBuilder.h:
        (JSC::ASTBuilder::makeAssignNode):
        * parser/Lexer.cpp:
        (JSC::Lexer<T>::lexWithoutClearingLineTerminator):
        * parser/Nodes.h:
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseAssignmentExpression):
        * parser/ParserTokens.h:

2020-04-17  Devin Rousso  <drousso@apple.com>

        Implement Promise.any and AggregateError
        https://bugs.webkit.org/show_bug.cgi?id=202566

        Reviewed by Yusuke Suzuki.

        `Promise.any` resolves when any of the given `promises` resolve, but only rejects if _all_
        of the given `promises` reject. In order to support aggregating all of the `reason` values
        for all of the rejections, a new error type `AggregateError` is introduced which has an
        `get errors` that returns an aggregated array of the `reason` values.

        * builtins/PromiseConstructor.js:
        (all.newResolveElement):
        (allSettled.newResolveRejectElements):
        (any): Added.
        (any.newRejectElement): Added.
        * runtime/JSPromiseConstructor.cpp:

        * builtins/BuiltinNames.h:
        * bytecode/LinkTimeConstant.h:
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::errorStructure const):
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::initializeAggregateErrorConstructor): Added.
        (JSC::JSGlobalObject::init):
        (JSC::JSGlobalObject::visitChildren):
        Expose `@AggregateError` for builtins.

        * runtime/AggregateError.h: Added.
        (JSC::AggregateError::destroy):
        (JSC::AggregateError::subspaceFor):
        (JSC::AggregateError::createStructure):
        (JSC::AggregateError::create):
        (JSC::AggregateError::errors const):
        * runtime/AggregateError.cpp: Added.
        (JSC::AggregateError::AggregateError):
        (JSC::AggregateError::visitChildren):
        (JSC::AggregateError::create):
        (JSC::AggregateError::finishCreation):
        * runtime/AggregateErrorPrototype.h: Added.
        * runtime/AggregateErrorPrototype.cpp: Added.
        (JSC::AggregateErrorPrototype::AggregateErrorPrototype):
        (JSC::AggregateErrorPrototype::finishCreation):
        (JSC::aggregateErrorPrototypeAccessorErrors):
        * runtime/AggregateErrorConstructor.h: Added.
        * runtime/AggregateErrorConstructor.cpp: Added.
        (JSC::callAggregateErrorConstructor):
        (JSC::constructAggregateErrorConstructor):
        (JSC::AggregateErrorConstructor::AggregateErrorConstructor):
        (JSC::AggregateErrorConstructor::finishCreation):
        * runtime/ErrorType.h:
        * runtime/ErrorType.cpp:
        (JSC::errorTypeName):

        * runtime/VM.h:
        * runtime/VM.cpp:
        (JSC::VM::VM):
        Make an `IsoSubspace` for `AggregateError` as it has a different size than `ErrorInstance`.

        * runtime/ErrorInstance.h:
        (JSC::ErrorInstance::create):
        * runtime/ErrorInstance.cpp:
        (JSC::ErrorInstance::finishCreation):
        * wasm/js/JSWebAssemblyCompileError.cpp:
        (JSC::JSWebAssemblyCompileError::create):
        * wasm/js/JSWebAssemblyLinkError.cpp:
        (JSC::JSWebAssemblyLinkError::create):
        * wasm/js/JSWebAssemblyRuntimeError.cpp:
        (JSC::JSWebAssemblyRuntimeError::create):
        Assign to `ErrorInstance` member variables inside `ErrorInstance::finishCreation` instead of
        inside `ErrorInstance::create` so that subclasses don't have to do the work as well.

        * runtime/Error.cpp:
        (JSC::createError):

        * runtime/ErrorPrototype.h:
        (JSC::ErrorPrototype::createStructure):
        * runtime/NativeErrorPrototype.h:
        (JSC::NativeErrorPrototype::createStructure):
        Drive-by: fix incorrect usage of `ErrorInstanceType` since `ErrorPrototype` does not inherit
                  from `ErrorInstance` (and therefore neither does `NativeErrorPrototype`).

        * runtime/ArgList.h:
        Add `WTF_MAKE_NONMOVABLE` to `MarkedArgumentBuffer`.

        * Sources.txt:
        * JavaScriptCore.xcodeproj/project.pbxproj:

2020-04-17  Ross Kirsling  <ross.kirsling@sony.com>

        Clean up some Intl classes following the ICU upgrade
        https://bugs.webkit.org/show_bug.cgi?id=210637

        Reviewed by Yusuke Suzuki.

        In r259606, I removed the compile-time guards for {DateTimeFormat, NumberFormat}.prototype.formatToParts,
        but I forgot to move the method setup back to the lookup table.

        This patch addresses that and prunes various other unnecessary includes and forward declarations.

        * runtime/IntlCollator.h:
        * runtime/IntlCollatorConstructor.h:
        * runtime/IntlDateTimeFormat.h:
        * runtime/IntlDateTimeFormatConstructor.h:
        * runtime/IntlDateTimeFormatPrototype.cpp:
        (JSC::IntlDateTimeFormatPrototype::create):
        (JSC::IntlDateTimeFormatPrototype::finishCreation):
        * runtime/IntlDateTimeFormatPrototype.h:
        * runtime/IntlNumberFormat.h:
        * runtime/IntlNumberFormatConstructor.h:
        * runtime/IntlNumberFormatPrototype.cpp:
        (JSC::IntlNumberFormatPrototype::create):
        (JSC::IntlNumberFormatPrototype::finishCreation):
        * runtime/IntlNumberFormatPrototype.h:
        * runtime/IntlObject.h:
        * runtime/IntlPluralRules.h:
        * runtime/IntlPluralRulesConstructor.h:
        * runtime/IntlPluralRulesPrototype.cpp:
        (JSC::IntlPluralRulesPrototype::create):
        (JSC::IntlPluralRulesPrototype::finishCreation):
        * runtime/IntlPluralRulesPrototype.h:

2020-04-17  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Map/Set iterator creation functions should fail with BadType etc. before executing insertChecks
        https://bugs.webkit.org/show_bug.cgi?id=210649
        <rdar://problem/61925452>

        Reviewed by Mark Lam.

        Since insertChecks adds some DFG nodes, we should determine whether this intrinsic handling is OK or not before executing insertChecks.
        Otherwise, we will hit an assertion with `!didInsertChecks`.

        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::handleIntrinsicCall):

2020-04-17  Mark Lam  <mark.lam@apple.com>

        offlineasm is generating the wrong load/store for the "orh" instruction.
        https://bugs.webkit.org/show_bug.cgi?id=210639
        <rdar://problem/21501876>

        Reviewed by Robin Morisset.

        For example, on ARM64E, the "orh" instruction was generating the following:

            "\tldr w17, [x1, #0]\n"     // JavaScriptCore/llint/LowLevelInterpreter64.asm:919
            "\torr w17, w17, #64\n"     // JavaScriptCore/llint/LowLevelInterpreter64.asm:919
            "\tstr w17, [x1, #0]\n"     // JavaScriptCore/llint/LowLevelInterpreter64.asm:919

        i.e. a 32-bit load, followed by a 32-bit OR, followed by a 32-bit store.

        Instead, it should be generating the following:

            "\tldrh w17, [x1, #0]\n"    // JavaScriptCore/llint/LowLevelInterpreter64.asm:919
            "\torr w17, w17, #64\n"     // JavaScriptCore/llint/LowLevelInterpreter64.asm:919
            "\tstrh w17, [x1, #0]\n"    // JavaScriptCore/llint/LowLevelInterpreter64.asm:919

        i.e. a 16-bit load, followed by a 32-bit OR, followed by a 16-bit store.

        This bug also affects ARM64, ARMv7, and MIPS (basically any backend that uses
        riscLowerMisplacedAddresses() from rise.rb).  It does not affect x86, x86_64, and
        C_LOOP (which was written based on x86).

        * offlineasm/risc.rb:

2020-04-16  Ross Kirsling  <ross.kirsling@sony.com>

        REGRESSION(r259480): Two new failing i18n tests
        https://bugs.webkit.org/show_bug.cgi?id=210605

        Reviewed by Darin Adler.

        * runtime/IntlDateTimeFormat.cpp:
        (JSC::isUTCEquivalent):
        (JSC::defaultTimeZone):
        (JSC::canonicalizeTimeZoneName):
        The default time zone needs to be canonicalized too.

        * runtime/IntlObject.cpp:
        (JSC::canonicalLangTag):
        (JSC::resolveLocale):
        Deal with some odd ""_s cases from my previous patch.
        (Drive-by fix inspired by Darin's comments on this one.)

2020-04-16  Sergio Villar Senin  <svillar@igalia.com>

        Unreviewed build fix for non unified builds.

        * dfg/DFGOperations.cpp: Added missing includes.

2020-04-16  Mark Lam  <mark.lam@apple.com>

        [Re-landing] Use more PAC diversity for JIT probe code.
        https://bugs.webkit.org/show_bug.cgi?id=210252
        <rdar://problem/54490367>

        Reviewed by Keith Miller.

        Introducing new PtrTags:
            JITProbePtrTag - for the client probe function.
            JITProbeTrampolinePtrTag - for calling the ctiMasmProbeTrampoline.
            JITProbeExecutorPtrTag - for calling the probe executor.
                Currently, this is only the Probe::executeProbe().
            JITProbeStackInitializationFunctionPtrTag - for calling the optional stack
                initialization function that the client probe function may set.

        We'll now use these in the JIT probe mechanism instead of adopting the default
        CFunctionPtrTag.

        Fixed an assert in MacroAssemblerARM64.cpp which does not apply to non ARM64E
        builds.

        * assembler/MacroAssembler.cpp:
        (JSC::MacroAssembler::probe):
        * assembler/MacroAssemblerARM64.cpp:
        (JSC::MacroAssembler::probe):
        * assembler/MacroAssemblerPrinter.h:
        (JSC::MacroAssembler::print):
        * assembler/ProbeContext.h:
        * runtime/JSCPtrTag.h:
        * tools/JSDollarVM.cpp:
        (JSC::callWithStackSizeProbeFunction):
        * wasm/WasmAirIRGenerator.cpp:
        (JSC::Wasm::AirIRGenerator::emitLoopTierUpCheck):
        * wasm/WasmB3IRGenerator.cpp:
        (JSC::Wasm::B3IRGenerator::emitLoopTierUpCheck):

2020-04-16  Mark Lam  <mark.lam@apple.com>

        Rolling out r259897: Causing crashes on iOS.
        https://bugs.webkit.org/show_bug.cgi?id=210252

        Not reviewed.

        * assembler/MacroAssembler.cpp:
        (JSC::MacroAssembler::probe):
        * assembler/MacroAssemblerARM64.cpp:
        (JSC::MacroAssembler::probe):
        * assembler/MacroAssemblerPrinter.h:
        (JSC::MacroAssembler::print):
        * assembler/ProbeContext.h:
        * runtime/JSCPtrTag.h:
        * tools/JSDollarVM.cpp:
        (JSC::callWithStackSizeProbeFunction):
        * wasm/WasmAirIRGenerator.cpp:
        (JSC::Wasm::AirIRGenerator::emitLoopTierUpCheck):
        * wasm/WasmB3IRGenerator.cpp:
        (JSC::Wasm::B3IRGenerator::emitLoopTierUpCheck):

2020-04-16  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Implement JSMapIterator/JSSetIterator with JSInternalFieldObjectImpl
        https://bugs.webkit.org/show_bug.cgi?id=210023

        Reviewed by Keith Miller.

        This patch reimplement JSMapIterator/JSSetIterator with JSInternalFieldObjectImpl.
        This makes current JSFinalObject-based Map/SetIterator simple and small.
        We generalize NewArrayIterator/PhantomNewArrayIterator to convert them to NewInternalFieldObject/PhantomNewInternalFieldObject
        to support JSMapIterator/JSSetIterator too in DFG / FTL. This makes allocation efficient and object-allocation-sinking aware.

        * builtins/BuiltinNames.h:
        * builtins/MapIteratorPrototype.js:
        (globalPrivate.mapIteratorNext):
        (next):
        * builtins/MapPrototype.js:
        (globalPrivate.MapIterator): Deleted.
        (values): Deleted.
        (keys): Deleted.
        (entries): Deleted.
        * builtins/SetIteratorPrototype.js:
        (globalPrivate.setIteratorNext):
        (next):
        * builtins/SetPrototype.js:
        (globalPrivate.SetIterator): Deleted.
        (values): Deleted.
        (entries): Deleted.
        * bytecode/BytecodeIntrinsicRegistry.cpp:
        (JSC::BytecodeIntrinsicRegistry::BytecodeIntrinsicRegistry):
        * bytecode/BytecodeIntrinsicRegistry.h:
        * bytecompiler/BytecodeGenerator.h:
        (JSC::BytecodeGenerator::emitIsMapIterator):
        (JSC::BytecodeGenerator::emitIsSetIterator):
        * bytecompiler/NodesCodegen.cpp:
        (JSC::mapIteratorInternalFieldIndex):
        (JSC::setIteratorInternalFieldIndex):
        (JSC::BytecodeIntrinsicNode::emit_intrinsic_getMapIteratorInternalField):
        (JSC::BytecodeIntrinsicNode::emit_intrinsic_getSetIteratorInternalField):
        (JSC::BytecodeIntrinsicNode::emit_intrinsic_putMapIteratorInternalField):
        (JSC::BytecodeIntrinsicNode::emit_intrinsic_putSetIteratorInternalField):
        * dfg/DFGAbstractInterpreterInlines.h:
        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
        * dfg/DFGByteCodeParser.cpp:
        (JSC::DFG::ByteCodeParser::handleIntrinsicCall):
        * dfg/DFGClobberize.h:
        (JSC::DFG::clobberize):
        * dfg/DFGClobbersExitState.cpp:
        (JSC::DFG::clobbersExitState):
        * dfg/DFGConstantFoldingPhase.cpp:
        (JSC::DFG::ConstantFoldingPhase::foldConstants):
        * dfg/DFGDoesGC.cpp:
        (JSC::DFG::doesGC):
        * dfg/DFGFixupPhase.cpp:
        (JSC::DFG::FixupPhase::fixupNode):
        * dfg/DFGMayExit.cpp:
        * dfg/DFGNode.h:
        (JSC::DFG::Node::convertToPhantomNewInternalFieldObject):
        (JSC::DFG::Node::hasStructure):
        (JSC::DFG::Node::isPhantomAllocation):
        (JSC::DFG::Node::convertToPhantomNewArrayIterator): Deleted.
        * dfg/DFGNodeType.h:
        * dfg/DFGObjectAllocationSinkingPhase.cpp:
        * dfg/DFGOperations.cpp:
        * dfg/DFGOperations.h:
        * dfg/DFGPredictionPropagationPhase.cpp:
        * dfg/DFGSafeToExecute.h:
        (JSC::DFG::safeToExecute):
        * dfg/DFGSpeculativeJIT.cpp:
        (JSC::DFG::SpeculativeJIT::compileNewInternalFieldObjectImpl):
        (JSC::DFG::SpeculativeJIT::compileNewGenerator):
        (JSC::DFG::SpeculativeJIT::compileNewAsyncGenerator):
        (JSC::DFG::SpeculativeJIT::compileNewInternalFieldObject):
        (JSC::DFG::SpeculativeJIT::compileNewArrayIterator): Deleted.
        * dfg/DFGSpeculativeJIT.h:
        * dfg/DFGSpeculativeJIT32_64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGSpeculativeJIT64.cpp:
        (JSC::DFG::SpeculativeJIT::compile):
        * dfg/DFGStoreBarrierInsertionPhase.cpp:
        * ftl/FTLCapabilities.cpp:
        (JSC::FTL::canCompile):
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileNode):
        (JSC::FTL::DFG::LowerDFGToB3::compileNewInternalFieldObjectImpl):
        (JSC::FTL::DFG::LowerDFGToB3::compileNewGenerator):
        (JSC::FTL::DFG::LowerDFGToB3::compileNewAsyncGenerator):
        (JSC::FTL::DFG::LowerDFGToB3::compileNewInternalFieldObject):
        (JSC::FTL::DFG::LowerDFGToB3::compileMaterializeNewInternalFieldObject):
        (JSC::FTL::DFG::LowerDFGToB3::compileNewArrayIterator): Deleted.
        * ftl/FTLOperations.cpp:
        (JSC::FTL::operationPopulateObjectInOSR):
        (JSC::FTL::operationMaterializeObjectInOSR):
        * inspector/JSInjectedScriptHost.cpp:
        (Inspector::JSInjectedScriptHost::subtype):
        (Inspector::JSInjectedScriptHost::getInternalProperties):
        (Inspector::cloneMapIteratorObject):
        (Inspector::cloneSetIteratorObject):
        (Inspector::JSInjectedScriptHost::iteratorEntries):
        * runtime/CommonIdentifiers.h:
        * runtime/Intrinsic.cpp:
        (JSC::intrinsicName):
        * runtime/Intrinsic.h:
        * runtime/JSArrayIterator.h:
        * runtime/JSGlobalObject.cpp:
        (JSC::JSGlobalObject::init):
        (JSC::JSGlobalObject::visitChildren):
        * runtime/JSGlobalObject.h:
        (JSC::JSGlobalObject::mapIteratorPrototype const):
        (JSC::JSGlobalObject::setIteratorPrototype const):
        (JSC::JSGlobalObject::mapIteratorStructure const):
        (JSC::JSGlobalObject::setIteratorStructure const):
        * runtime/JSMapIterator.cpp:
        (JSC::JSMapIterator::createWithInitialValues):
        (JSC::JSMapIterator::finishCreation):
        (JSC::JSMapIterator::visitChildren):
        * runtime/JSMapIterator.h:
        * runtime/JSSetIterator.cpp:
        (JSC::JSSetIterator::createWithInitialValues):
        (JSC::JSSetIterator::finishCreation):
        (JSC::JSSetIterator::visitChildren):
        * runtime/JSSetIterator.h:
        * runtime/JSType.cpp:
        (WTF::printInternal):
        * runtime/JSType.h:
        * runtime/JSTypedArrayViewPrototype.cpp:
        (JSC::JSTypedArrayViewPrototype::finishCreation):
        * runtime/MapPrototype.cpp:
        (JSC::MapPrototype::finishCreation):
        (JSC::createMapIteratorObject):
        (JSC::mapProtoFuncValues):
        (JSC::mapProtoFuncKeys):
        (JSC::mapProtoFuncEntries):
        * runtime/SetPrototype.cpp:
        (JSC::SetPrototype::finishCreation):
        (JSC::createSetIteratorObject):
        (JSC::setProtoFuncValues):
        (JSC::setProtoFuncEntries):
        * runtime/VM.cpp:
        (JSC::VM::setIteratorStructureSlow): Deleted.
        (JSC::VM::mapIteratorStructureSlow): Deleted.
        * runtime/VM.h:
        (JSC::VM::setIteratorStructure): Deleted.
        (JSC::VM::mapIteratorStructure): Deleted.

2020-04-15  Yusuke Suzuki  <ysuzuki@apple.com>

        [JSC] Use ensureStillAliveHere in FTL when content of storage should be kept alive
        https://bugs.webkit.org/show_bug.cgi?id=210583
        <rdar://problem/61831515>

        Reviewed by Mark Lam.

        The content of Butterfly / ArrayStorage is kept alive only when the owner JSCell is alive.
        This means that we should keep the owner JSCell alive if we are loading content of storage
        which includes JSCells. This patch inserts ensureStillAliveHere in FTL to ensure this invariant.

        * ftl/FTLJITCode.cpp:
        (JSC::FTL::JITCode::~JITCode): Found that we get crash with `dumpDisassembly` if FTL::JITCode is destroyed while it fails to generate code while testing this.
        * ftl/FTLLowerDFGToB3.cpp:
        (JSC::FTL::DFG::LowerDFGToB3::compileGetByVal):
        (JSC::FTL::DFG::LowerDFGToB3::compileArrayIndexOf):
        (JSC::FTL::DFG::LowerDFGToB3::compileArrayPop):
        (JSC::FTL::DFG::LowerDFGToB3::compileStringCharAt):
        (JSC::FTL::DFG::LowerDFGToB3::compileStringCharCodeAt):
        (JSC::FTL::DFG::LowerDFGToB3::compileStringCodePointAt):
        (JSC::FTL::DFG::LowerDFGToB3::compileGetByOffset):
        (JSC::FTL::DFG::LowerDFGToB3::compileMultiGetByOffset):

2020-04-15  Keith Miller  <keith_miller@apple.com>

        Disable Store-load pair auto-vectorization for JSC
        https://bugs.webkit.org/show_bug.cgi?id=210574

        Reviewed by Geoffrey Garen.

        slp-vectorization appears to make our slow path code significantly
        slower. That's because when we materialize our constant bytecode
        structs into C++ we load all the fields at the same time then
        widen them to the struct's member C++ size. Since we have 3
        different possible sizes Clang generates a total mess of
        code. Disabling this does not appear to be a regression on any
        platform I tested and improves the performance of slow path code
        significantly in micro benchmarks.

        * CMakeLists.txt:
        * Configurations/JavaScriptCore.xcconfig:

2020-04-15  Robin Morisset  <rmorisset@apple.com>

        Flaky Test: fetch/fetch-worker-crash.html
        https://bugs.webkit.org/show_bug.cgi?id=187257
        <rdar://problem/48527526>

        Reviewed by Yusuke Suzuki.

        The crash is coming from setExceptionPorts which is inlined in WTF::registerThreadForMachExceptionHandling.
        From the error message we know that the problem is an "invalid port right".
        http://web.mit.edu/darwin/src/modules/xnu/osfmk/man/thread_set_exception_ports.html tells us that the "port right" is the third parameter to thread_set_exception_ports, which is exceptionPort in our case.
        exceptionPort is a global variable defined at the top of Signals.cpp:
          static mach_port_t exceptionPort;
        It is set in exactly one place:
          kern_return_t kr = mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &exceptionPort);
        in a std::call_once, in startMachExceptionHandlerThread().
        Note that startMachExceptionHandlerThread() is called from the main thread just before the point where we are stuck.. and there is no synchronization to make sure it completed and its effect is visible to the worker thread before it uses exceptionPort.

        So I think the crash is due to this race between allocating exceptionPort and using it, resulting in an invalid exceptionPort being sometimes passed to the kernel.
        So this patch is a simple speculative fix, by running startMachExceptionHandlerThread() in initializeThreading(), before JSLock()::lock() can be run.

        * runtime/InitializeThreading.cpp:
        (JSC::initializeThreading):

2020-04-15  Ross Kirsling  <ross.kirsling@sony.com>

        Unreviewed build fix for r260161.

        * runtime/IntlObject.cpp:
        (JSC::canonicalLangTag):

2020-04-15  Ross Kirsling  <ross.kirsling@sony.com>

        Unreviewed, address Darin's feedback on r260151.

        * runtime/IntlObject.cpp:
        (JSC::canonicalLangTag):

2020-04-15  Ross Kirsling  <ross.kirsling@sony.com>

        [ECMA-402] Extension values should default to true, canonicalize without "-true"
        https://bugs.webkit.org/show_bug.cgi?id=210457

        Reviewed by Yusuke Suzuki.

        This patch implements two simple intertwining updates to ECMA-402:

          - Valueless extension keys should not be dropped when resolving locale
            https://tc39.es/ecma402/#sec-resolvelocale (9.h.4.b)

          - Following UTS 35, "-true" should not appear in canonicalized locale ids
            https://tc39.es/ecma402/#sec-canonicalizeunicodelocaleid
            https://unicode.org/reports/tr35/#Canonical_Unicode_Locale_Identifiers
            ('Any type or tfield value "true" is removed.')

        * runtime/IntlObject.cpp:
        (JSC::canonicalLangTag):
        (JSC::resolveLocale):

2020-04-15  Ross Kirsling  <ross.kirsling@sony.com>

        [ECMA-402] Fix Intl.DateTimeFormat patterns and fields in WebKit
        https://bugs.webkit.org/show_bug.cgi?id=209783

        Reviewed by Keith Miller.

        This patch implements two intertwining normative changes to Intl.DateTimeFormat:
          - Calendar setting must be taken into account when choosing a date-time pattern
            https://github.com/tc39/ecma402/pull/349
          - formatToParts must recognize relatedYear and yearName parts
            https://github.com/tc39/ecma402/pull/349

        * runtime/IntlDateTimeFormat.cpp:
        (JSC::IntlDateTimeFormat::initializeDateTimeFormat):
        (JSC::IntlDateTimeFormat::partTypeString):

2020-04-15  Devin Rousso  <drousso@apple.com>

        [ESNext] Implement logical assignment operators
        https://bugs.webkit.org/show_bug.cgi?id=209716

        Reviewed by Ross Kirsling.

        Implement the logical assignment operators proposal, which is now Stage 3. It introduces
        three new assignment operators which will only store the result of the rhs in the lhs if the
        lhs meets the given condition:
         - `??=`, for if the lhs is nullish (`null` or `undefined`)
         - `||=`, for if the lhs is falsy
         - `&&=`, for if the lhs is truthy

        This short circuiting can be beneficial as it can avoid a redundant store when used in the
        common JavaScript programming pattern of "defaulting" a parameter.

        ```js
            function foo(x) {
                x = x || 42;
            }
        ```

        If `x` is a truthy value, it would result in the rhs `x` being stored back into the lhs `x`.
        In some situations, this can have negative unintended side-effects, such as for `innerHTML`.

        Logical assignment operators, however, are defined such that they only store if the rhs is
        to actually be needed/used, skipping the redundant store and simply returning lhs otherwise.

        In the case of readonly references, this means that an error is only thrown when the
        assignment occurs, meaning that if the lhs already satisfies the condition it will be used
        and returned with no error.

        * parser/ParserTokens.h:
        * parser/Lexer.cpp:
        (JSC::Lexer<T>::lexWithoutClearingLineTerminator):
        * parser/Parser.cpp:
        (JSC::Parser<LexerType>::parseAssignmentExpression):

        * parser/ASTBuilder.h:
        (JSC::ASTBuilder::makeAssignNode):
        * parser/Nodes.h:
        * parser/NodeConstructors.h:
        (JSC::ShortCircuitReadModifyResolveNode::ShortCircuitReadModifyResolveNode): Added.
        (JSC::ShortCircuitReadModifyBracketNode::ShortCircuitReadModifyBracketNode): Added.
        (JSC::ShortCircuitReadModifyDotNode::ShortCircuitReadModifyDotNode): Added.
        * bytecompiler/NodesCodegen.cpp:
        (JSC::emitShortCircuitAssignment): Added.
        (JSC::ShortCircuitReadModifyResolveNode::emitBytecode): Added.
        (JSC::ShortCircuitReadModifyDotNode::emitBytecode): Added.
        (JSC::ShortCircuitReadModifyBracketNode::emitBytecode): Added.

        * runtime/OptionsList.h:
        Add a `useLogicalAssignmentOperators` setting for controlling this feature.

2020-04-14  Devin Rousso  <drousso@apple.com>

        Web Inspector: Debugger: add a Step next that steps by expression
        https://bugs.webkit.org/show_bug.cgi?id=210324

        Reviewed by Timothy Hatcher.

        Step next is a hybrid of Step over and Step into which continues execution to the next pause
        opportunity within the current (or ancestor) call frame. It is especially useful when trying
        to debug minified code, such as trying to continue to `c()` in `a() && b() && c();`, where
        Step over would continue to the next statement (i.e. after the `;`) and Step in would
        continue to the first line inside `a()` (and would require a Step out to get back).

        * inspector/protocol/Debugger.json:
        * inspector/agents/InspectorDebuggerAgent.h:
        * inspector/agents/InspectorDebuggerAgent.cpp:
        (Inspector::InspectorDebuggerAgent::stepNext): Added.

        * debugger/Debugger.h:
        * debugger/Debugger.cpp:
        (JSC::Debugger::stepNextExpression): Added.
        (JSC::Debugger::atExpression):
        (JSC::Debugger::clearNextPauseState):

2020-04-13  Alexey Shvayka  <shvaikalesh@gmail.com>

        REGRESSION (r259587): bterlson/eshost throws during init in strict mode
        https://bugs.webkit.org/show_bug.cgi?id=210470

        Reviewed by Ross Kirsling.

        This change makes $262.IsHTMLDDA of JSC shell a CustomValue, allowing it to be reassigned
        and restoring compatibility with any version of https://github.com/bterlson/eshost.

        Since putDirectCustomAccessor() is now used instead of putGetter(), scope exception assert
        is no longer needed and can be safely removed, as well as JSObject::putGetter() export.

        * jsc.cpp:
        * runtime/JSObject.h:

2020-04-13  David Kilzer  <ddkilzer@apple.com>

        Replace use of Checked<size_t, RecordOverflow> with CheckedSize
        <https://webkit.org/b/210461>

        Reviewed by Mark Lam.

        * heap/Heap.cpp:
        (JSC::Heap::deprecatedReportExtraMemorySlowCase):
        (JSC::Heap::extraMemorySize):
        (JSC::Heap::updateAllocationLimits):
        (JSC::Heap::reportExtraMemoryVisited):
        * heap/SlotVisitor.h:
        * runtime/ArgList.cpp:
        (JSC::MarkedArgumentBuffer::expandCapacity):

2020-04-10  Michael Saboff  <msaboff@apple.com>

        [YARR] Allow for Unicode named capture group identifiers in non-Unicode regular expressions
        https://bugs.webkit.org/show_bug.cgi?id=210309

        Reviewed by Ross Kirsling.

        Update YARR pattern processing to allow for non-BMP unicode identifier characters in named capture groups.

        This change was discussed and approved at the March/April 2020 TC-39 meeting.
        See https://github.com/tc39/ecma262/pull/1869 for the discussion and change.

        Updated tryConsumeUnicodeEscape() to allow for unicode escapes in non-unicode flagged regex's.
        Added the same support to consumePossibleSurrogatePair().

        * yarr/YarrParser.h:
        (JSC::Yarr::Parser::consumePossibleSurrogatePair):
        (JSC::Yarr::Parser::parseCharacterClass):
        (JSC::Yarr::Parser::parseTokens):
        (JSC::Yarr::Parser::tryConsumeUnicodeEscape):
        (JSC::Yarr::Parser::tryConsumeIdentifierCharacter):

2020-04-13  Michael Catanzaro  <mcatanzaro@gnome.org>

        Fix various build warnings
        https://bugs.webkit.org/show_bug.cgi?id=210429

        Reviewed by Mark Lam.

        Fix -Wimplicit-fallthrough warning by adding a default case CRASH() to prevent the inner
        switch from falling through to the outer switch.

        * dfg/DFGArrayMode.cpp:
        (JSC::DFG::ArrayMode::alreadyChecked const):

2020-04-12  Mark Lam  <mark.lam@apple.com>

        Enable the ability to build the ASM LLInt for ARMv7k.
        https://bugs.webkit.org/show_bug.cgi?id=210412

        Reviewed by Sam Weinig.

        Fix the offlineasm so that it can build the ASM LLInt for ARMv7k.  This patch does
        not actually enable the ASM LLInt.  The ARMv7k port still build the C Loop LLInt.

        Also, the ARMv7k ASM LLInt is still broken and needs additional work before it
        can run.  This patch only fixes things so that it will build.

        * JavaScriptCore.xcodeproj/project.pbxproj:
        - Added generate_settings_extractor.rb to the project so that we can view it from
          inside Xcode.

        * offlineasm/arm.rb:
        - Added support for the globaladdr LLInt instruction for ARMv7k.

        * offlineasm/backends.rb:
        - Fix the backend to enable ARMV7 also when building for ARMv7k.

2020-04-12  Darin Adler  <darin@apple.com>

        Fix a few mispellings of descendant and propagation
        https://bugs.webkit.org/show_bug.cgi?id=210409

        Reviewed by Mark Lam.

        * ftl/FTLAbstractHeap.h: "descendants"
        * offlineasm/ast.rb: "descendants"

2020-04-12  Ross Kirsling  <ross.kirsling@sony.com>

        [ECMA-402] WebKit Intl does not allow calendar and numberingSystem options
        https://bugs.webkit.org/show_bug.cgi?id=209784

        Reviewed by Myles C. Maxfield.

        As an alternative to using `ca` and `nu` extensions in the locale string:
          - the Intl.DateTimeFormat constructor needs to be able to take `calendar` and `numberingSystem` options
            https://tc39.es/ecma402/#sec-initializedatetimeformat
          - the Intl.NumberFormat needs to be able to take a `numberingSystem` option
            https://tc39.es/ecma402/#sec-initializenumberformat

        Since we already support `ca` and `nu`, this is a very simple addition.
        The only interesting part is that we must verify that values for these options are 3-8 alphanumeric characters.

        * runtime/IntlDateTimeFormat.cpp:
        (JSC::IntlDateTimeFormat::initializeDateTimeFormat):
        * runtime/IntlNumberFormat.cpp:
        (JSC::IntlNumberFormat::initializeNumberFormat):
        (JSC::IntlNumberFormat::resolvedOptions):
        * runtime/IntlObject.cpp:
        (JSC::isUnicodeLocaleIdentifierType):
        * runtime/IntlObject.h:

2020-04-10  Ross Kirsling  <ross.kirsling@sony.com>

        [ECMA-402] Properly implement BigInt.prototype.toLocaleString
        https://bugs.webkit.org/show_bug.cgi?id=209782

        Reviewed by Darin Adler.

        Our BigInt's toLocaleString has been simply falling back to toString instead of following ECMA-402.
        (https://tc39.es/ecma402/#sup-bigint.prototype.tolocalestring)

        Since {Number, BigInt}.prototype.toLocaleString are internally the same as Intl.NumberFormat.prototype.format,
        this patch simultaneously lets the latter method take a BigInt argument.
        (https://tc39.es/ecma402/#sec-number-format-functions)

        This patch continues to use the old unum_* API instead of ICU 62's new unumf_* API,
        as the latter would require a large refactor as well as fallback paths.
        (This will, however, be a prerequisite for https://bugs.webkit.org/show_bug.cgi?id=209774.)

        * runtime/BigIntPrototype.cpp:
        (JSC::bigIntProtoFuncToString):
        (JSC::bigIntProtoFuncToLocaleString):
        (JSC::bigIntProtoFuncToStringImpl): Deleted.
        * runtime/IntlNumberFormat.cpp:
        (JSC::IntlNumberFormat::format):
        (JSC::IntlNumberFormat::formatNumber): Deleted.
        * runtime/IntlNumberFormat.h:
        * runtime/IntlNumberFormatPrototype.cpp:
        (JSC::IntlNumberFormatFuncFormat):
        (JSC::IntlNumberFormatPrototypeGetterFormat):
        (JSC::IntlNumberFormatFuncFormatNumber): Deleted.
        * runtime/NumberPrototype.cpp:
        (JSC::numberProtoFuncToLocaleString):

2020-04-10  Devin Rousso  <drousso@apple.com>

        The rhs in `ReadModifyResolveNode` should be evaluated before throwing an exception if the lhs is read-only
        https://bugs.webkit.org/show_bug.cgi?id=210317

        Reviewed by Ross Kirsling.

        * bytecompiler/NodesCodegen.cpp:
        (JSC::emitReadModifyAssignment):
        (JSC::ReadModifyResolveNode::emitBytecode):
        If the corresponding `Variable` is read-only, pass it to `emitReadModifyAssignment` as an
        additional optionl argument, where it will be used to `emitReadOnlyExceptionIfNeeded` after
        the rhs is emitted.

2020-04-10  Mark Lam  <mark.lam@apple.com>

        Use more PAC diversity for JIT probe code.
        https://bugs.webkit.org/show_bug.cgi?id=210252
        <rdar://problem/54490367>

        Reviewed by Keith Miller.

        Introducing new PtrTags:
            JITProbePtrTag - for the client probe function.
            JITProbeTrampolinePtrTag - for calling the ctiMasmProbeTrampoline.
            JITProbeExecutorPtrTag - for calling the probe executor.
                Currently, this is only the Probe::executeProbe().
            JITProbeStackInitializationFunctionPtrTag - for calling the optional stack
                initialization function that the client probe function may set.

        We'll now use these in the JIT probe mechanism instead of adopting the default
        CFunctionPtrTag.

        * assembler/MacroAssembler.cpp:
        (JSC::MacroAssembler::probe):
        * assembler/MacroAssemblerARM64.cpp:
        (JSC::MacroAssembler::probe):
        * assembler/MacroAssemblerPrinter.h:
        (JSC::MacroAssembler::print):
        * assembler/ProbeContext.h:
        * runtime/JSCPtrTag.h:
        * tools/JSDollarVM.cpp:
        (JSC::callWithStackSizeProbeFunction):
        * wasm/WasmAirIRGenerator.cpp:
        (JSC::Wasm::AirIRGenerator::emitLoopTierUpCheck):
        * wasm/WasmB3IRGenerator.cpp:
        (JSC::Wasm::B3IRGenerator::emitLoopTierUpCheck):

2020-04-10  Mark Lam  <mark.lam@apple.com>

        [Follow up] Fix bad tests in testmasm's testCagePreservesPACFailureBit().
        https://bugs.webkit.org/show_bug.cgi?id=210314
        <rdar://problem/61556785>

        Not reviewed.

        Applying Keith's feedback in https://bugs.webkit.org/show_bug.cgi?id=210314#c5:
        added the stronger test but kept the weaker one as well.

        * assembler/testmasm.cpp:
        (JSC::testCagePreservesPACFailureBit):

== Rolled over to ChangeLog-2020-04-10 ==