| /* |
| * Copyright (C) 1999-2002 Harri Porten (porten@kde.org) |
| * Copyright (C) 2001 Peter Kelly (pmk@post.com) |
| * Copyright (C) 2003-2019 Apple Inc. All rights reserved. |
| * Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca) |
| * Copyright (C) 2007 Maks Orlovich |
| * Copyright (C) 2015 Canon Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #include "config.h" |
| #include "JSFunction.h" |
| |
| #include "AsyncGeneratorPrototype.h" |
| #include "BuiltinNames.h" |
| #include "CatchScope.h" |
| #include "ClonedArguments.h" |
| #include "CommonIdentifiers.h" |
| #include "CallFrame.h" |
| #include "GeneratorPrototype.h" |
| #include "JSBoundFunction.h" |
| #include "JSCInlines.h" |
| #include "JSGlobalObject.h" |
| #include "JSToWasmICCallee.h" |
| #include "ObjectConstructor.h" |
| #include "ObjectPrototype.h" |
| #include "PropertyNameArray.h" |
| #include "StackVisitor.h" |
| #include "TypeError.h" |
| |
| namespace JSC { |
| |
| EncodedJSValue JSC_HOST_CALL callHostFunctionAsConstructor(JSGlobalObject* globalObject, CallFrame* callFrame) |
| { |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| return throwVMError(globalObject, scope, createNotAConstructorError(globalObject, callFrame->jsCallee())); |
| } |
| |
| const ClassInfo JSFunction::s_info = { "Function", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSFunction) }; |
| const ClassInfo JSStrictFunction::s_info = { "Function", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSStrictFunction) }; |
| const ClassInfo JSSloppyFunction::s_info = { "Function", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSSloppyFunction) }; |
| const ClassInfo JSArrowFunction::s_info = { "Function", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSArrowFunction) }; |
| |
| bool JSFunction::isHostFunctionNonInline() const |
| { |
| return isHostFunction(); |
| } |
| |
| Structure* JSFunction::selectStructureForNewFuncExp(JSGlobalObject* globalObject, FunctionExecutable* executable) |
| { |
| ASSERT(!executable->isHostFunction()); |
| bool isBuiltin = executable->isBuiltinFunction(); |
| if (executable->isArrowFunction()) |
| return globalObject->arrowFunctionStructure(isBuiltin); |
| if (executable->isInStrictContext()) |
| return globalObject->strictFunctionStructure(isBuiltin); |
| return globalObject->sloppyFunctionStructure(isBuiltin); |
| } |
| |
| JSFunction* JSFunction::create(VM& vm, FunctionExecutable* executable, JSScope* scope) |
| { |
| return create(vm, executable, scope, selectStructureForNewFuncExp(scope->globalObject(vm), executable)); |
| } |
| |
| JSFunction* JSFunction::create(VM& vm, FunctionExecutable* executable, JSScope* scope, Structure* structure) |
| { |
| JSFunction* result = createImpl(vm, executable, scope, structure); |
| executable->notifyCreation(vm, result, "Allocating a function"); |
| return result; |
| } |
| |
| JSFunction* JSFunction::create(VM& vm, JSGlobalObject* globalObject, int length, const String& name, NativeFunction nativeFunction, Intrinsic intrinsic, NativeFunction nativeConstructor, const DOMJIT::Signature* signature) |
| { |
| NativeExecutable* executable = vm.getHostFunction(nativeFunction, intrinsic, nativeConstructor, signature, name); |
| Structure* structure = globalObject->hostFunctionStructure(); |
| JSFunction* function = new (NotNull, allocateCell<JSFunction>(vm.heap)) JSFunction(vm, executable, globalObject, structure); |
| // Can't do this during initialization because getHostFunction might do a GC allocation. |
| function->finishCreation(vm, executable, length, name); |
| return function; |
| } |
| |
| JSFunction* JSFunction::createFunctionThatMasqueradesAsUndefined(VM& vm, JSGlobalObject* globalObject, int length, const String& name, NativeFunction nativeFunction, Intrinsic intrinsic, NativeFunction nativeConstructor, const DOMJIT::Signature* signature) |
| { |
| NativeExecutable* executable = vm.getHostFunction(nativeFunction, intrinsic, nativeConstructor, signature, name); |
| Structure* structure = Structure::create(vm, globalObject, globalObject->objectPrototype(), TypeInfo(JSFunctionType, JSFunction::StructureFlags | MasqueradesAsUndefined), JSFunction::info()); |
| globalObject->masqueradesAsUndefinedWatchpoint()->fireAll(globalObject->vm(), "Allocated masquerading object"); |
| JSFunction* function = new (NotNull, allocateCell<JSFunction>(vm.heap)) JSFunction(vm, executable, globalObject, structure); |
| function->finishCreation(vm, executable, length, name); |
| return function; |
| } |
| |
| JSFunction::JSFunction(VM& vm, NativeExecutable* executable, JSGlobalObject* globalObject, Structure* structure) |
| : Base(vm, globalObject, structure) |
| , m_executableOrRareData(bitwise_cast<uintptr_t>(executable)) |
| { |
| assertTypeInfoFlagInvariants(); |
| ASSERT(structure->globalObject() == globalObject); |
| } |
| |
| |
| void JSFunction::finishCreation(VM& vm) |
| { |
| Base::finishCreation(vm); |
| ASSERT(jsDynamicCast<JSFunction*>(vm, this)); |
| ASSERT(type() == JSFunctionType); |
| ASSERT(methodTable(vm)->getConstructData == &JSFunction::getConstructData); |
| ASSERT(methodTable(vm)->getCallData == &JSFunction::getCallData); |
| } |
| |
| void JSFunction::finishCreation(VM& vm, NativeExecutable*, int length, const String& name) |
| { |
| Base::finishCreation(vm); |
| ASSERT(inherits(vm, info())); |
| ASSERT(type() == JSFunctionType); |
| ASSERT(methodTable(vm)->getConstructData == &JSFunction::getConstructData); |
| ASSERT(methodTable(vm)->getCallData == &JSFunction::getCallData); |
| |
| // Some NativeExecutable functions, like JSBoundFunction, decide to lazily allocate their name string / length. |
| if (this->inherits<JSBoundFunction>(vm)) |
| return; |
| |
| if (!name.isNull()) |
| putDirect(vm, vm.propertyNames->name, jsString(vm, name), PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum); |
| putDirect(vm, vm.propertyNames->length, jsNumber(length), PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum); |
| } |
| |
| FunctionRareData* JSFunction::allocateRareData(VM& vm) |
| { |
| uintptr_t executableOrRareData = m_executableOrRareData; |
| ASSERT(!(executableOrRareData & rareDataTag)); |
| FunctionRareData* rareData = FunctionRareData::create(vm, bitwise_cast<ExecutableBase*>(executableOrRareData)); |
| executableOrRareData = bitwise_cast<uintptr_t>(rareData) | rareDataTag; |
| |
| // A DFG compilation thread may be trying to read the rare data |
| // We want to ensure that it sees it properly allocated |
| WTF::storeStoreFence(); |
| |
| m_executableOrRareData = executableOrRareData; |
| vm.heap.writeBarrier(this, rareData); |
| |
| return rareData; |
| } |
| |
| JSObject* JSFunction::prototypeForConstruction(VM& vm, JSGlobalObject* globalObject) |
| { |
| // This code assumes getting the prototype is not effectful. That's only |
| // true when we can use the allocation profile. |
| ASSERT(canUseAllocationProfile()); |
| auto scope = DECLARE_CATCH_SCOPE(vm); |
| JSValue prototype = get(globalObject, vm.propertyNames->prototype); |
| scope.releaseAssertNoException(); |
| if (LIKELY(prototype.isObject())) |
| return asObject(prototype); |
| if (isHostOrBuiltinFunction()) |
| return this->globalObject()->objectPrototype(); |
| |
| JSGlobalObject* scopeGlobalObject = this->scope()->globalObject(); |
| // https://tc39.github.io/ecma262/#sec-generator-function-definitions-runtime-semantics-evaluatebody |
| if (isGeneratorWrapperParseMode(jsExecutable()->parseMode())) |
| return scopeGlobalObject->generatorPrototype(); |
| // https://tc39.github.io/ecma262/#sec-asyncgenerator-definitions-evaluatebody |
| if (isAsyncGeneratorWrapperParseMode(jsExecutable()->parseMode())) |
| return scopeGlobalObject->asyncGeneratorPrototype(); |
| return scopeGlobalObject->objectPrototype(); |
| } |
| |
| FunctionRareData* JSFunction::allocateAndInitializeRareData(JSGlobalObject* globalObject, size_t inlineCapacity) |
| { |
| uintptr_t executableOrRareData = m_executableOrRareData; |
| ASSERT(!(executableOrRareData & rareDataTag)); |
| ASSERT(canUseAllocationProfile()); |
| VM& vm = globalObject->vm(); |
| JSObject* prototype = prototypeForConstruction(vm, globalObject); |
| FunctionRareData* rareData = FunctionRareData::create(vm, bitwise_cast<ExecutableBase*>(executableOrRareData)); |
| rareData->initializeObjectAllocationProfile(vm, this->globalObject(), prototype, inlineCapacity, this); |
| executableOrRareData = bitwise_cast<uintptr_t>(rareData) | rareDataTag; |
| |
| // A DFG compilation thread may be trying to read the rare data |
| // We want to ensure that it sees it properly allocated |
| WTF::storeStoreFence(); |
| |
| m_executableOrRareData = executableOrRareData; |
| vm.heap.writeBarrier(this, rareData); |
| |
| return rareData; |
| } |
| |
| FunctionRareData* JSFunction::initializeRareData(JSGlobalObject* globalObject, size_t inlineCapacity) |
| { |
| uintptr_t executableOrRareData = m_executableOrRareData; |
| ASSERT(executableOrRareData & rareDataTag); |
| ASSERT(canUseAllocationProfile()); |
| VM& vm = globalObject->vm(); |
| JSObject* prototype = prototypeForConstruction(vm, globalObject); |
| FunctionRareData* rareData = bitwise_cast<FunctionRareData*>(executableOrRareData & ~rareDataTag); |
| rareData->initializeObjectAllocationProfile(vm, this->globalObject(), prototype, inlineCapacity, this); |
| return rareData; |
| } |
| |
| String JSFunction::name(VM& vm) |
| { |
| if (isHostFunction()) { |
| if (this->inherits<JSBoundFunction>(vm)) |
| return jsCast<JSBoundFunction*>(this)->nameString(); |
| NativeExecutable* executable = jsCast<NativeExecutable*>(this->executable()); |
| return executable->name(); |
| } |
| const Identifier identifier = jsExecutable()->name(); |
| if (identifier == vm.propertyNames->builtinNames().starDefaultPrivateName()) |
| return emptyString(); |
| return identifier.string(); |
| } |
| |
| String JSFunction::displayName(VM& vm) |
| { |
| JSValue displayName = getDirect(vm, vm.propertyNames->displayName); |
| |
| if (displayName && isJSString(displayName)) |
| return asString(displayName)->tryGetValue(); |
| |
| return String(); |
| } |
| |
| const String JSFunction::calculatedDisplayName(VM& vm) |
| { |
| const String explicitName = displayName(vm); |
| |
| if (!explicitName.isEmpty()) |
| return explicitName; |
| |
| const String actualName = name(vm); |
| if (!actualName.isEmpty() || isHostOrBuiltinFunction()) |
| return actualName; |
| |
| return jsExecutable()->ecmaName().string(); |
| } |
| |
| const SourceCode* JSFunction::sourceCode() const |
| { |
| if (isHostOrBuiltinFunction()) |
| return nullptr; |
| return &jsExecutable()->source(); |
| } |
| |
| void JSFunction::visitChildren(JSCell* cell, SlotVisitor& visitor) |
| { |
| JSFunction* thisObject = jsCast<JSFunction*>(cell); |
| ASSERT_GC_OBJECT_INHERITS(thisObject, info()); |
| Base::visitChildren(thisObject, visitor); |
| |
| visitor.appendUnbarriered(bitwise_cast<JSCell*>(bitwise_cast<uintptr_t>(thisObject->m_executableOrRareData) & ~rareDataTag)); |
| } |
| |
| CallData JSFunction::getCallData(JSCell* cell) |
| { |
| CallData callData; |
| |
| JSFunction* thisObject = jsCast<JSFunction*>(cell); |
| if (thisObject->isHostFunction()) { |
| callData.type = CallData::Type::Native; |
| callData.native.function = thisObject->nativeFunction(); |
| } else { |
| callData.type = CallData::Type::JS; |
| callData.js.functionExecutable = thisObject->jsExecutable(); |
| callData.js.scope = thisObject->scope(); |
| } |
| |
| return callData; |
| } |
| |
| class RetrieveArgumentsFunctor { |
| public: |
| RetrieveArgumentsFunctor(VM& vm, JSFunction* functionObj) |
| : m_vm(vm) |
| , m_targetCallee(functionObj) |
| , m_result(jsNull()) |
| { |
| } |
| |
| JSValue result() const { return m_result; } |
| |
| StackVisitor::Status operator()(StackVisitor& visitor) const |
| { |
| if (!visitor->callee().isCell()) |
| return StackVisitor::Continue; |
| |
| JSCell* callee = visitor->callee().asCell(); |
| if (callee != m_targetCallee) |
| return StackVisitor::Continue; |
| |
| m_result = JSValue(visitor->createArguments(m_vm)); |
| return StackVisitor::Done; |
| } |
| |
| private: |
| VM& m_vm; |
| JSObject* m_targetCallee; |
| mutable JSValue m_result; |
| }; |
| |
| static JSValue retrieveArguments(VM& vm, CallFrame* callFrame, JSFunction* functionObj) |
| { |
| RetrieveArgumentsFunctor functor(vm, functionObj); |
| if (callFrame) |
| callFrame->iterate(vm, functor); |
| return functor.result(); |
| } |
| |
| EncodedJSValue JSFunction::argumentsGetter(JSGlobalObject* globalObject, EncodedJSValue thisValue, PropertyName) |
| { |
| VM& vm = globalObject->vm(); |
| JSFunction* thisObj = jsCast<JSFunction*>(JSValue::decode(thisValue)); |
| ASSERT(!thisObj->isHostFunction()); |
| |
| return JSValue::encode(retrieveArguments(vm, vm.topCallFrame, thisObj)); |
| } |
| |
| class RetrieveCallerFunctionFunctor { |
| public: |
| RetrieveCallerFunctionFunctor(JSFunction* functionObj) |
| : m_targetCallee(functionObj) |
| , m_hasFoundFrame(false) |
| , m_hasSkippedToCallerFrame(false) |
| , m_result(jsNull()) |
| { |
| } |
| |
| JSValue result() const { return m_result; } |
| |
| StackVisitor::Status operator()(StackVisitor& visitor) const |
| { |
| if (!visitor->callee().isCell()) |
| return StackVisitor::Continue; |
| |
| JSCell* callee = visitor->callee().asCell(); |
| |
| if (callee && callee->inherits<JSBoundFunction>(callee->vm())) |
| return StackVisitor::Continue; |
| |
| if (!m_hasFoundFrame && (callee != m_targetCallee)) |
| return StackVisitor::Continue; |
| |
| m_hasFoundFrame = true; |
| if (!m_hasSkippedToCallerFrame) { |
| m_hasSkippedToCallerFrame = true; |
| return StackVisitor::Continue; |
| } |
| |
| if (callee) |
| m_result = callee; |
| return StackVisitor::Done; |
| } |
| |
| private: |
| JSObject* m_targetCallee; |
| mutable bool m_hasFoundFrame; |
| mutable bool m_hasSkippedToCallerFrame; |
| mutable JSValue m_result; |
| }; |
| |
| static JSValue retrieveCallerFunction(VM& vm, CallFrame* callFrame, JSFunction* functionObj) |
| { |
| RetrieveCallerFunctionFunctor functor(functionObj); |
| if (callFrame) |
| callFrame->iterate(vm, functor); |
| return functor.result(); |
| } |
| |
| EncodedJSValue JSFunction::callerGetter(JSGlobalObject* globalObject, EncodedJSValue thisValue, PropertyName) |
| { |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| |
| JSFunction* thisObj = jsCast<JSFunction*>(JSValue::decode(thisValue)); |
| ASSERT(!thisObj->isHostFunction()); |
| JSValue caller = retrieveCallerFunction(vm, vm.topCallFrame, thisObj); |
| |
| // See ES5.1 15.3.5.4 - Function.caller may not be used to retrieve a strict caller. |
| if (!caller.isObject() || !asObject(caller)->inherits<JSFunction>(vm)) { |
| // It isn't a JSFunction, but if it is a JSCallee from a program or eval call or an internal constructor, return null. |
| if (jsDynamicCast<JSCallee*>(vm, caller) || jsDynamicCast<InternalFunction*>(vm, caller)) |
| return JSValue::encode(jsNull()); |
| return JSValue::encode(caller); |
| } |
| JSFunction* function = jsCast<JSFunction*>(caller); |
| |
| // Firefox returns null for native code callers, so we match that behavior. |
| if (function->isHostOrBuiltinFunction()) |
| return JSValue::encode(jsNull()); |
| SourceParseMode parseMode = function->jsExecutable()->parseMode(); |
| switch (parseMode) { |
| case SourceParseMode::GeneratorBodyMode: |
| case SourceParseMode::AsyncGeneratorBodyMode: |
| return JSValue::encode(throwTypeError(globalObject, scope, "Function.caller used to retrieve generator body"_s)); |
| case SourceParseMode::AsyncFunctionBodyMode: |
| case SourceParseMode::AsyncArrowFunctionBodyMode: |
| return JSValue::encode(throwTypeError(globalObject, scope, "Function.caller used to retrieve async function body"_s)); |
| case SourceParseMode::NormalFunctionMode: |
| case SourceParseMode::GeneratorWrapperFunctionMode: |
| case SourceParseMode::GetterMode: |
| case SourceParseMode::SetterMode: |
| case SourceParseMode::MethodMode: |
| case SourceParseMode::ArrowFunctionMode: |
| case SourceParseMode::AsyncFunctionMode: |
| case SourceParseMode::AsyncMethodMode: |
| case SourceParseMode::AsyncArrowFunctionMode: |
| case SourceParseMode::ProgramMode: |
| case SourceParseMode::ModuleAnalyzeMode: |
| case SourceParseMode::ModuleEvaluateMode: |
| case SourceParseMode::AsyncGeneratorWrapperFunctionMode: |
| case SourceParseMode::AsyncGeneratorWrapperMethodMode: |
| case SourceParseMode::GeneratorWrapperMethodMode: |
| case SourceParseMode::InstanceFieldInitializerMode: |
| if (!function->jsExecutable()->isInStrictContext()) |
| return JSValue::encode(caller); |
| return JSValue::encode(throwTypeError(globalObject, scope, "Function.caller used to retrieve strict caller"_s)); |
| } |
| RELEASE_ASSERT_NOT_REACHED(); |
| } |
| |
| bool JSFunction::getOwnPropertySlot(JSObject* object, JSGlobalObject* globalObject, PropertyName propertyName, PropertySlot& slot) |
| { |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| |
| JSFunction* thisObject = jsCast<JSFunction*>(object); |
| if (thisObject->isHostOrBuiltinFunction()) { |
| thisObject->reifyLazyPropertyForHostOrBuiltinIfNeeded(vm, globalObject, propertyName); |
| RETURN_IF_EXCEPTION(scope, false); |
| RELEASE_AND_RETURN(scope, Base::getOwnPropertySlot(thisObject, globalObject, propertyName, slot)); |
| } |
| |
| if (propertyName == vm.propertyNames->prototype && thisObject->jsExecutable()->hasPrototypeProperty() && !thisObject->jsExecutable()->isClassConstructorFunction()) { |
| // NOTE: class constructors define the prototype property in bytecode using |
| // defineOwnProperty, which ends up calling into this code (see our defineOwnProperty |
| // implementation below). The bytecode will end up doing the proper definition |
| // with the property being non-writable/non-configurable. However, we must ignore |
| // the initial materialization of the property so that the defineOwnProperty call |
| // from bytecode succeeds. Otherwise, the materialization here would prevent the |
| // defineOwnProperty from being able to overwrite the property. |
| unsigned attributes; |
| PropertyOffset offset = thisObject->getDirectOffset(vm, propertyName, attributes); |
| if (!isValidOffset(offset)) { |
| JSGlobalObject* scopeGlobalObject = thisObject->scope()->globalObject(); |
| JSObject* prototype = nullptr; |
| if (isGeneratorWrapperParseMode(thisObject->jsExecutable()->parseMode())) { |
| // Unlike function instances, the object that is the value of the a GeneratorFunction's prototype |
| // property does not have a constructor property whose value is the GeneratorFunction instance. |
| // https://tc39.github.io/ecma262/#sec-generatorfunction-instances-prototype |
| prototype = constructEmptyObject(globalObject, scopeGlobalObject->generatorPrototype()); |
| } else if (isAsyncGeneratorWrapperParseMode(thisObject->jsExecutable()->parseMode())) |
| prototype = constructEmptyObject(globalObject, scopeGlobalObject->asyncGeneratorPrototype()); |
| else { |
| prototype = constructEmptyObject(globalObject, scopeGlobalObject->objectPrototype()); |
| prototype->putDirect(vm, vm.propertyNames->constructor, thisObject, static_cast<unsigned>(PropertyAttribute::DontEnum)); |
| } |
| |
| thisObject->putDirect(vm, vm.propertyNames->prototype, prototype, PropertyAttribute::DontDelete | PropertyAttribute::DontEnum); |
| offset = thisObject->getDirectOffset(vm, vm.propertyNames->prototype, attributes); |
| ASSERT(isValidOffset(offset)); |
| } |
| slot.setValue(thisObject, attributes, thisObject->getDirect(offset), offset); |
| } |
| |
| if (propertyName == vm.propertyNames->arguments) { |
| if (!thisObject->jsExecutable()->hasCallerAndArgumentsProperties()) |
| RELEASE_AND_RETURN(scope, Base::getOwnPropertySlot(thisObject, globalObject, propertyName, slot)); |
| |
| slot.setCacheableCustom(thisObject, PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum | PropertyAttribute::DontDelete, argumentsGetter); |
| return true; |
| |
| } else if (propertyName == vm.propertyNames->caller) { |
| if (!thisObject->jsExecutable()->hasCallerAndArgumentsProperties()) |
| RELEASE_AND_RETURN(scope, Base::getOwnPropertySlot(thisObject, globalObject, propertyName, slot)); |
| |
| slot.setCacheableCustom(thisObject, PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum | PropertyAttribute::DontDelete, callerGetter); |
| return true; |
| } |
| |
| thisObject->reifyLazyPropertyIfNeeded(vm, globalObject, propertyName); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| RELEASE_AND_RETURN(scope, Base::getOwnPropertySlot(thisObject, globalObject, propertyName, slot)); |
| } |
| |
| void JSFunction::getOwnNonIndexPropertyNames(JSObject* object, JSGlobalObject* globalObject, PropertyNameArray& propertyNames, EnumerationMode mode) |
| { |
| JSFunction* thisObject = jsCast<JSFunction*>(object); |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| |
| if (mode.includeDontEnumProperties()) { |
| if (!thisObject->isHostOrBuiltinFunction()) { |
| // Make sure prototype has been reified. |
| PropertySlot slot(thisObject, PropertySlot::InternalMethodType::VMInquiry); |
| thisObject->methodTable(vm)->getOwnPropertySlot(thisObject, globalObject, vm.propertyNames->prototype, slot); |
| RETURN_IF_EXCEPTION(scope, void()); |
| |
| if (thisObject->jsExecutable()->hasCallerAndArgumentsProperties()) { |
| propertyNames.add(vm.propertyNames->arguments); |
| propertyNames.add(vm.propertyNames->caller); |
| } |
| if (!thisObject->hasReifiedLength()) |
| propertyNames.add(vm.propertyNames->length); |
| if (!thisObject->hasReifiedName()) |
| propertyNames.add(vm.propertyNames->name); |
| } else { |
| if (thisObject->isBuiltinFunction() || thisObject->inherits<JSBoundFunction>(vm)) { |
| if (!thisObject->hasReifiedLength()) |
| propertyNames.add(vm.propertyNames->length); |
| if (!thisObject->hasReifiedName()) |
| propertyNames.add(vm.propertyNames->name); |
| } |
| } |
| } |
| RELEASE_AND_RETURN(scope, Base::getOwnNonIndexPropertyNames(thisObject, globalObject, propertyNames, mode)); |
| } |
| |
| bool JSFunction::put(JSCell* cell, JSGlobalObject* globalObject, PropertyName propertyName, JSValue value, PutPropertySlot& slot) |
| { |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| |
| JSFunction* thisObject = jsCast<JSFunction*>(cell); |
| |
| if (propertyName == vm.propertyNames->length || propertyName == vm.propertyNames->name) { |
| FunctionRareData* rareData = thisObject->ensureRareData(vm); |
| if (propertyName == vm.propertyNames->length) |
| rareData->setHasModifiedLengthForNonHostFunction(); |
| else |
| rareData->setHasModifiedNameForNonHostFunction(); |
| } |
| |
| if (UNLIKELY(isThisValueAltered(slot, thisObject))) |
| RELEASE_AND_RETURN(scope, ordinarySetSlow(globalObject, thisObject, propertyName, value, slot.thisValue(), slot.isStrictMode())); |
| |
| |
| if (thisObject->isHostOrBuiltinFunction()) { |
| PropertyStatus propertyType = thisObject->reifyLazyPropertyForHostOrBuiltinIfNeeded(vm, globalObject, propertyName); |
| RETURN_IF_EXCEPTION(scope, false); |
| if (isLazy(propertyType)) |
| slot.disableCaching(); |
| RELEASE_AND_RETURN(scope, Base::put(thisObject, globalObject, propertyName, value, slot)); |
| } |
| |
| if (propertyName == vm.propertyNames->prototype) { |
| slot.disableCaching(); |
| // Make sure prototype has been reified, such that it can only be overwritten |
| // following the rules set out in ECMA-262 8.12.9. |
| PropertySlot getSlot(thisObject, PropertySlot::InternalMethodType::VMInquiry); |
| thisObject->methodTable(vm)->getOwnPropertySlot(thisObject, globalObject, propertyName, getSlot); |
| RETURN_IF_EXCEPTION(scope, false); |
| if (FunctionRareData* rareData = thisObject->rareData()) |
| rareData->clear("Store to prototype property of a function"); |
| RELEASE_AND_RETURN(scope, Base::put(thisObject, globalObject, propertyName, value, slot)); |
| } |
| |
| if (propertyName == vm.propertyNames->arguments || propertyName == vm.propertyNames->caller) { |
| if (!thisObject->jsExecutable()->hasCallerAndArgumentsProperties()) |
| RELEASE_AND_RETURN(scope, Base::put(thisObject, globalObject, propertyName, value, slot)); |
| |
| slot.disableCaching(); |
| return typeError(globalObject, scope, slot.isStrictMode(), ReadonlyPropertyWriteError); |
| } |
| PropertyStatus propertyType = thisObject->reifyLazyPropertyIfNeeded(vm, globalObject, propertyName); |
| if (isLazy(propertyType)) |
| slot.disableCaching(); |
| RELEASE_AND_RETURN(scope, Base::put(thisObject, globalObject, propertyName, value, slot)); |
| } |
| |
| bool JSFunction::deleteProperty(JSCell* cell, JSGlobalObject* globalObject, PropertyName propertyName, DeletePropertySlot& slot) |
| { |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| JSFunction* thisObject = jsCast<JSFunction*>(cell); |
| |
| if (propertyName == vm.propertyNames->length || propertyName == vm.propertyNames->name) { |
| FunctionRareData* rareData = thisObject->ensureRareData(vm); |
| if (propertyName == vm.propertyNames->length) |
| rareData->setHasModifiedLengthForNonHostFunction(); |
| else |
| rareData->setHasModifiedNameForNonHostFunction(); |
| } |
| |
| if (thisObject->isHostOrBuiltinFunction()) { |
| thisObject->reifyLazyPropertyForHostOrBuiltinIfNeeded(vm, globalObject, propertyName); |
| RETURN_IF_EXCEPTION(scope, false); |
| } else if (vm.deletePropertyMode() != VM::DeletePropertyMode::IgnoreConfigurable) { |
| // For non-host functions, don't let these properties by deleted - except by DefineOwnProperty. |
| FunctionExecutable* executable = thisObject->jsExecutable(); |
| |
| if ((propertyName == vm.propertyNames->caller || propertyName == vm.propertyNames->arguments) && executable->hasCallerAndArgumentsProperties()) |
| return false; |
| |
| if (propertyName == vm.propertyNames->prototype && !executable->isArrowFunction()) |
| return false; |
| |
| thisObject->reifyLazyPropertyIfNeeded(vm, globalObject, propertyName); |
| RETURN_IF_EXCEPTION(scope, false); |
| } |
| |
| RELEASE_AND_RETURN(scope, Base::deleteProperty(thisObject, globalObject, propertyName, slot)); |
| } |
| |
| bool JSFunction::defineOwnProperty(JSObject* object, JSGlobalObject* globalObject, PropertyName propertyName, const PropertyDescriptor& descriptor, bool throwException) |
| { |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| |
| JSFunction* thisObject = jsCast<JSFunction*>(object); |
| |
| if (propertyName == vm.propertyNames->length || propertyName == vm.propertyNames->name) { |
| FunctionRareData* rareData = thisObject->ensureRareData(vm); |
| if (propertyName == vm.propertyNames->length) |
| rareData->setHasModifiedLengthForNonHostFunction(); |
| else |
| rareData->setHasModifiedNameForNonHostFunction(); |
| } |
| |
| if (thisObject->isHostOrBuiltinFunction()) { |
| thisObject->reifyLazyPropertyForHostOrBuiltinIfNeeded(vm, globalObject, propertyName); |
| RETURN_IF_EXCEPTION(scope, false); |
| RELEASE_AND_RETURN(scope, Base::defineOwnProperty(object, globalObject, propertyName, descriptor, throwException)); |
| } |
| |
| if (propertyName == vm.propertyNames->prototype) { |
| // Make sure prototype has been reified, such that it can only be overwritten |
| // following the rules set out in ECMA-262 8.12.9. |
| PropertySlot slot(thisObject, PropertySlot::InternalMethodType::VMInquiry); |
| thisObject->methodTable(vm)->getOwnPropertySlot(thisObject, globalObject, propertyName, slot); |
| RETURN_IF_EXCEPTION(scope, false); |
| if (FunctionRareData* rareData = thisObject->rareData()) |
| rareData->clear("Store to prototype property of a function"); |
| RELEASE_AND_RETURN(scope, Base::defineOwnProperty(object, globalObject, propertyName, descriptor, throwException)); |
| } |
| |
| bool valueCheck; |
| if (propertyName == vm.propertyNames->arguments) { |
| if (!thisObject->jsExecutable()->hasCallerAndArgumentsProperties()) |
| RELEASE_AND_RETURN(scope, Base::defineOwnProperty(object, globalObject, propertyName, descriptor, throwException)); |
| |
| valueCheck = !descriptor.value(); |
| if (!valueCheck) { |
| valueCheck = sameValue(globalObject, descriptor.value(), retrieveArguments(vm, vm.topCallFrame, thisObject)); |
| RETURN_IF_EXCEPTION(scope, false); |
| } |
| } else if (propertyName == vm.propertyNames->caller) { |
| if (!thisObject->jsExecutable()->hasCallerAndArgumentsProperties()) |
| RELEASE_AND_RETURN(scope, Base::defineOwnProperty(object, globalObject, propertyName, descriptor, throwException)); |
| |
| valueCheck = !descriptor.value(); |
| if (!valueCheck) { |
| valueCheck = sameValue(globalObject, descriptor.value(), retrieveCallerFunction(vm, vm.topCallFrame, thisObject)); |
| RETURN_IF_EXCEPTION(scope, false); |
| } |
| } else { |
| thisObject->reifyLazyPropertyIfNeeded(vm, globalObject, propertyName); |
| RETURN_IF_EXCEPTION(scope, false); |
| RELEASE_AND_RETURN(scope, Base::defineOwnProperty(object, globalObject, propertyName, descriptor, throwException)); |
| } |
| |
| if (descriptor.configurablePresent() && descriptor.configurable()) |
| return typeError(globalObject, scope, throwException, UnconfigurablePropertyChangeConfigurabilityError); |
| if (descriptor.enumerablePresent() && descriptor.enumerable()) |
| return typeError(globalObject, scope, throwException, UnconfigurablePropertyChangeEnumerabilityError); |
| if (descriptor.isAccessorDescriptor()) |
| return typeError(globalObject, scope, throwException, UnconfigurablePropertyChangeAccessMechanismError); |
| if (descriptor.writablePresent() && descriptor.writable()) |
| return typeError(globalObject, scope, throwException, UnconfigurablePropertyChangeWritabilityError); |
| if (!valueCheck) |
| return typeError(globalObject, scope, throwException, ReadonlyPropertyChangeError); |
| return true; |
| } |
| |
| // ECMA 13.2.2 [[Construct]] |
| CallData JSFunction::getConstructData(JSCell* cell) |
| { |
| CallData constructData; |
| |
| JSFunction* thisObject = jsCast<JSFunction*>(cell); |
| if (thisObject->isHostFunction()) { |
| if (thisObject->nativeConstructor() != callHostFunctionAsConstructor) { |
| constructData.type = CallData::Type::Native; |
| constructData.native.function = thisObject->nativeConstructor(); |
| } |
| } else { |
| FunctionExecutable* functionExecutable = thisObject->jsExecutable(); |
| if (functionExecutable->constructAbility() != ConstructAbility::CannotConstruct) { |
| constructData.type = CallData::Type::JS; |
| constructData.js.functionExecutable = functionExecutable; |
| constructData.js.scope = thisObject->scope(); |
| } |
| } |
| |
| return constructData; |
| } |
| |
| String getCalculatedDisplayName(VM& vm, JSObject* object) |
| { |
| #if ENABLE(WEBASSEMBLY) |
| if (jsDynamicCast<JSToWasmICCallee*>(vm, object)) |
| return "wasm-stub"_s; |
| #endif |
| |
| if (!jsDynamicCast<JSFunction*>(vm, object) && !jsDynamicCast<InternalFunction*>(vm, object)) |
| return emptyString(); |
| |
| Structure* structure = object->structure(vm); |
| unsigned attributes; |
| // This function may be called when the mutator isn't running and we are lazily generating a stack trace. |
| PropertyOffset offset = structure->getConcurrently(vm.propertyNames->displayName.impl(), attributes); |
| if (offset != invalidOffset && !(attributes & (PropertyAttribute::Accessor | PropertyAttribute::CustomAccessorOrValue))) { |
| JSValue displayName = object->getDirect(offset); |
| if (displayName && displayName.isString()) |
| return asString(displayName)->tryGetValue(); |
| } |
| |
| if (auto* function = jsDynamicCast<JSFunction*>(vm, object)) { |
| const String actualName = function->name(vm); |
| if (!actualName.isEmpty() || function->isHostOrBuiltinFunction()) |
| return actualName; |
| |
| return function->jsExecutable()->ecmaName().string(); |
| } |
| if (auto* function = jsDynamicCast<InternalFunction*>(vm, object)) |
| return function->name(); |
| |
| |
| return emptyString(); |
| } |
| |
| void JSFunction::setFunctionName(JSGlobalObject* globalObject, JSValue value) |
| { |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| |
| // The "name" property may have been already been defined as part of a property list in an |
| // object literal (and therefore reified). |
| if (hasReifiedName()) |
| return; |
| |
| ASSERT(!isHostFunction()); |
| ASSERT(jsExecutable()->ecmaName().isNull()); |
| String name; |
| if (value.isSymbol()) { |
| PrivateName privateName = asSymbol(value)->privateName(); |
| SymbolImpl& uid = privateName.uid(); |
| if (uid.isNullSymbol()) |
| name = emptyString(); |
| else |
| name = makeString('[', String(&uid), ']'); |
| } else { |
| ASSERT(value.isString()); |
| name = asString(value)->value(globalObject); |
| RETURN_IF_EXCEPTION(scope, void()); |
| } |
| reifyName(vm, globalObject, name); |
| } |
| |
| void JSFunction::reifyLength(VM& vm) |
| { |
| FunctionRareData* rareData = this->ensureRareData(vm); |
| |
| ASSERT(!hasReifiedLength()); |
| unsigned length = 0; |
| if (this->inherits<JSBoundFunction>(vm)) |
| length = jsCast<JSBoundFunction*>(this)->length(vm); |
| else { |
| ASSERT(!isHostFunction()); |
| length = jsExecutable()->parameterCount(); |
| } |
| JSValue initialValue = jsNumber(length); |
| unsigned initialAttributes = PropertyAttribute::DontEnum | PropertyAttribute::ReadOnly; |
| const Identifier& identifier = vm.propertyNames->length; |
| rareData->setHasReifiedLength(); |
| putDirect(vm, identifier, initialValue, initialAttributes); |
| } |
| |
| void JSFunction::reifyName(VM& vm, JSGlobalObject* globalObject) |
| { |
| const Identifier& ecmaName = jsExecutable()->ecmaName(); |
| String name; |
| // https://tc39.github.io/ecma262/#sec-exports-runtime-semantics-evaluation |
| // When the ident is "*default*", we need to set "default" for the ecma name. |
| // This "*default*" name is never shown to users. |
| if (ecmaName == vm.propertyNames->builtinNames().starDefaultPrivateName()) |
| name = vm.propertyNames->defaultKeyword.string(); |
| else |
| name = ecmaName.string(); |
| reifyName(vm, globalObject, name); |
| } |
| |
| void JSFunction::reifyName(VM& vm, JSGlobalObject* globalObject, String name) |
| { |
| FunctionRareData* rareData = this->ensureRareData(vm); |
| |
| ASSERT(!hasReifiedName()); |
| ASSERT(!isHostFunction()); |
| unsigned initialAttributes = PropertyAttribute::DontEnum | PropertyAttribute::ReadOnly; |
| const Identifier& propID = vm.propertyNames->name; |
| |
| if (globalObject->needsSiteSpecificQuirks()) { |
| auto illegalCharMatcher = [] (UChar ch) -> bool { |
| return ch == ' ' || ch == '|'; |
| }; |
| if (name.find(illegalCharMatcher) != notFound) |
| name = String(); |
| } |
| |
| if (jsExecutable()->isGetter()) |
| name = makeString("get ", name); |
| else if (jsExecutable()->isSetter()) |
| name = makeString("set ", name); |
| |
| rareData->setHasReifiedName(); |
| putDirect(vm, propID, jsString(vm, name), initialAttributes); |
| } |
| |
| JSFunction::PropertyStatus JSFunction::reifyLazyPropertyIfNeeded(VM& vm, JSGlobalObject* globalObject, PropertyName propertyName) |
| { |
| if (isHostOrBuiltinFunction() && !this->inherits<JSBoundFunction>(vm)) |
| return PropertyStatus::Eager; |
| PropertyStatus lazyLength = reifyLazyLengthIfNeeded(vm, globalObject, propertyName); |
| if (isLazy(lazyLength)) |
| return lazyLength; |
| PropertyStatus lazyName = reifyLazyNameIfNeeded(vm, globalObject, propertyName); |
| if (isLazy(lazyName)) |
| return lazyName; |
| return PropertyStatus::Eager; |
| } |
| |
| JSFunction::PropertyStatus JSFunction::reifyLazyPropertyForHostOrBuiltinIfNeeded(VM& vm, JSGlobalObject* globalObject, PropertyName propertyName) |
| { |
| ASSERT(isHostOrBuiltinFunction()); |
| if (isBuiltinFunction() || this->inherits<JSBoundFunction>(vm)) { |
| PropertyStatus lazyLength = reifyLazyLengthIfNeeded(vm, globalObject, propertyName); |
| if (isLazy(lazyLength)) |
| return lazyLength; |
| } |
| return reifyLazyBoundNameIfNeeded(vm, globalObject, propertyName); |
| } |
| |
| JSFunction::PropertyStatus JSFunction::reifyLazyLengthIfNeeded(VM& vm, JSGlobalObject*, PropertyName propertyName) |
| { |
| if (propertyName == vm.propertyNames->length) { |
| if (!hasReifiedLength()) { |
| reifyLength(vm); |
| return PropertyStatus::Reified; |
| } |
| return PropertyStatus::Lazy; |
| } |
| return PropertyStatus::Eager; |
| } |
| |
| JSFunction::PropertyStatus JSFunction::reifyLazyNameIfNeeded(VM& vm, JSGlobalObject* globalObject, PropertyName propertyName) |
| { |
| if (propertyName == vm.propertyNames->name) { |
| if (!hasReifiedName()) { |
| reifyName(vm, globalObject); |
| return PropertyStatus::Reified; |
| } |
| return PropertyStatus::Lazy; |
| } |
| return PropertyStatus::Eager; |
| } |
| |
| JSFunction::PropertyStatus JSFunction::reifyLazyBoundNameIfNeeded(VM& vm, JSGlobalObject* globalObject, PropertyName propertyName) |
| { |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| |
| const Identifier& nameIdent = vm.propertyNames->name; |
| if (propertyName != nameIdent) |
| return PropertyStatus::Eager; |
| |
| if (hasReifiedName()) |
| return PropertyStatus::Lazy; |
| |
| if (isBuiltinFunction()) |
| reifyName(vm, globalObject); |
| else if (this->inherits<JSBoundFunction>(vm)) { |
| FunctionRareData* rareData = this->ensureRareData(vm); |
| JSString* nameMayBeNull = jsCast<JSBoundFunction*>(this)->nameMayBeNull(); |
| JSString* string = nullptr; |
| if (nameMayBeNull) { |
| string = jsString(globalObject, vm.smallStrings.boundPrefixString(), nameMayBeNull); |
| RETURN_IF_EXCEPTION(scope, PropertyStatus::Lazy); |
| } else |
| string = jsEmptyString(vm); |
| unsigned initialAttributes = PropertyAttribute::DontEnum | PropertyAttribute::ReadOnly; |
| rareData->setHasReifiedName(); |
| putDirect(vm, nameIdent, string, initialAttributes); |
| } |
| return PropertyStatus::Reified; |
| } |
| |
| #if ASSERT_ENABLED |
| void JSFunction::assertTypeInfoFlagInvariants() |
| { |
| // If you change this, you'll need to update speculationFromClassInfoInheritance. |
| const ClassInfo* info = classInfo(vm()); |
| if (!(inlineTypeFlags() & ImplementsDefaultHasInstance)) |
| RELEASE_ASSERT(info == JSBoundFunction::info()); |
| else |
| RELEASE_ASSERT(info != JSBoundFunction::info()); |
| } |
| #endif // ASSERT_ENABLED |
| |
| } // namespace JSC |
