| /* |
| * Copyright (C) 2016-2021 Apple Inc. All Rights Reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "ProxyObject.h" |
| |
| #include "JSCInlines.h" |
| #include "ObjectConstructor.h" |
| #include "VMInlines.h" |
| #include <wtf/NoTailCalls.h> |
| |
| // Note that we use NO_TAIL_CALLS() throughout this file because we rely on the machine stack |
| // growing larger for throwing OOM errors for when we have an effectively cyclic prototype chain. |
| |
| namespace JSC { |
| |
| STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(ProxyObject); |
| |
| const ClassInfo ProxyObject::s_info = { "ProxyObject", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(ProxyObject) }; |
| |
| static JSC_DECLARE_HOST_FUNCTION(performProxyCall); |
| static JSC_DECLARE_HOST_FUNCTION(performProxyConstruct); |
| |
| ProxyObject::ProxyObject(VM& vm, Structure* structure) |
| : Base(vm, structure) |
| { |
| } |
| |
| Structure* ProxyObject::structureForTarget(JSGlobalObject* globalObject, JSValue target) |
| { |
| VM& vm = globalObject->vm(); |
| return target.isCallable(vm) ? globalObject->callableProxyObjectStructure() : globalObject->proxyObjectStructure(); |
| } |
| |
| void ProxyObject::finishCreation(VM& vm, JSGlobalObject* globalObject, JSValue target, JSValue handler) |
| { |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| Base::finishCreation(vm); |
| ASSERT(type() == ProxyObjectType); |
| if (!target.isObject()) { |
| throwTypeError(globalObject, scope, "A Proxy's 'target' should be an Object"_s); |
| return; |
| } |
| if (!handler.isObject()) { |
| throwTypeError(globalObject, scope, "A Proxy's 'handler' should be an Object"_s); |
| return; |
| } |
| |
| JSObject* targetAsObject = jsCast<JSObject*>(target); |
| |
| m_isCallable = targetAsObject->isCallable(vm); |
| if (m_isCallable) { |
| TypeInfo info = structure(vm)->typeInfo(); |
| RELEASE_ASSERT(info.implementsHasInstance() && info.implementsDefaultHasInstance()); |
| } |
| |
| m_isConstructible = targetAsObject->isConstructor(vm); |
| |
| m_target.set(vm, this, targetAsObject); |
| m_handler.set(vm, this, handler); |
| } |
| |
| static const ASCIILiteral s_proxyAlreadyRevokedErrorMessage { "Proxy has already been revoked. No more operations are allowed to be performed on it"_s }; |
| |
| static JSValue performProxyGet(JSGlobalObject* globalObject, ProxyObject* proxyObject, JSValue receiver, PropertyName propertyName) |
| { |
| NO_TAIL_CALLS(); |
| |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| if (UNLIKELY(!vm.isSafeToRecurseSoft())) { |
| throwStackOverflowError(globalObject, scope); |
| return { }; |
| } |
| |
| JSObject* target = proxyObject->target(); |
| |
| auto performDefaultGet = [&] { |
| scope.release(); |
| PropertySlot slot(receiver, PropertySlot::InternalMethodType::Get); |
| bool hasProperty = target->getPropertySlot(globalObject, propertyName, slot); |
| EXCEPTION_ASSERT(!scope.exception() || !hasProperty); |
| if (hasProperty) |
| RELEASE_AND_RETURN(scope, slot.getValue(globalObject, propertyName)); |
| |
| return jsUndefined(); |
| }; |
| |
| if (propertyName.isPrivateName()) |
| return jsUndefined(); |
| |
| JSValue handlerValue = proxyObject->handler(); |
| if (handlerValue.isNull()) |
| return throwTypeError(globalObject, scope, s_proxyAlreadyRevokedErrorMessage); |
| |
| JSObject* handler = jsCast<JSObject*>(handlerValue); |
| CallData callData; |
| JSValue getHandler = handler->getMethod(globalObject, callData, vm.propertyNames->get, "'get' property of a Proxy's handler object should be callable"_s); |
| RETURN_IF_EXCEPTION(scope, { }); |
| |
| if (getHandler.isUndefined()) |
| return performDefaultGet(); |
| |
| MarkedArgumentBuffer arguments; |
| arguments.append(target); |
| arguments.append(identifierToSafePublicJSValue(vm, Identifier::fromUid(vm, propertyName.uid()))); |
| arguments.append(receiver); |
| ASSERT(!arguments.hasOverflowed()); |
| JSValue trapResult = call(globalObject, getHandler, callData, handler, arguments); |
| RETURN_IF_EXCEPTION(scope, { }); |
| |
| PropertyDescriptor descriptor; |
| bool result = target->getOwnPropertyDescriptor(globalObject, propertyName, descriptor); |
| EXCEPTION_ASSERT(!scope.exception() || !result); |
| if (result) { |
| if (descriptor.isDataDescriptor() && !descriptor.configurable() && !descriptor.writable()) { |
| bool isSame = sameValue(globalObject, descriptor.value(), trapResult); |
| RETURN_IF_EXCEPTION(scope, { }); |
| if (!isSame) |
| return throwTypeError(globalObject, scope, "Proxy handler's 'get' result of a non-configurable and non-writable property should be the same value as the target's property"_s); |
| } else if (descriptor.isAccessorDescriptor() && !descriptor.configurable() && descriptor.getter().isUndefined()) { |
| if (!trapResult.isUndefined()) |
| return throwTypeError(globalObject, scope, "Proxy handler's 'get' result of a non-configurable accessor property without a getter should be undefined"_s); |
| } |
| } |
| |
| RETURN_IF_EXCEPTION(scope, { }); |
| |
| return trapResult; |
| } |
| |
| bool ProxyObject::performGet(JSGlobalObject* globalObject, PropertyName propertyName, PropertySlot& slot) |
| { |
| NO_TAIL_CALLS(); |
| |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| JSValue result = performProxyGet(globalObject, this, slot.thisValue(), propertyName); |
| RETURN_IF_EXCEPTION(scope, false); |
| unsigned ignoredAttributes = 0; |
| slot.setValue(this, ignoredAttributes, result); |
| return true; |
| } |
| |
| // https://tc39.es/ecma262/#sec-completepropertydescriptor |
| static void completePropertyDescriptor(PropertyDescriptor& desc) |
| { |
| if (desc.isAccessorDescriptor()) { |
| if (!desc.getter()) |
| desc.setGetter(jsUndefined()); |
| if (!desc.setter()) |
| desc.setSetter(jsUndefined()); |
| } else { |
| if (!desc.value()) |
| desc.setValue(jsUndefined()); |
| if (!desc.writablePresent()) |
| desc.setWritable(false); |
| } |
| if (!desc.enumerablePresent()) |
| desc.setEnumerable(false); |
| if (!desc.configurablePresent()) |
| desc.setConfigurable(false); |
| } |
| |
| bool ProxyObject::performInternalMethodGetOwnProperty(JSGlobalObject* globalObject, PropertyName propertyName, PropertySlot& slot) |
| { |
| NO_TAIL_CALLS(); |
| |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| if (UNLIKELY(!vm.isSafeToRecurseSoft())) { |
| throwStackOverflowError(globalObject, scope); |
| return false; |
| } |
| JSObject* target = this->target(); |
| |
| auto performDefaultGetOwnProperty = [&] { |
| return target->methodTable(vm)->getOwnPropertySlot(target, globalObject, propertyName, slot); |
| }; |
| |
| if (propertyName.isPrivateName()) |
| return false; |
| |
| JSValue handlerValue = this->handler(); |
| if (handlerValue.isNull()) { |
| throwTypeError(globalObject, scope, s_proxyAlreadyRevokedErrorMessage); |
| return false; |
| } |
| |
| JSObject* handler = jsCast<JSObject*>(handlerValue); |
| CallData callData; |
| JSValue getOwnPropertyDescriptorMethod = handler->getMethod(globalObject, callData, makeIdentifier(vm, "getOwnPropertyDescriptor"), "'getOwnPropertyDescriptor' property of a Proxy's handler should be callable"_s); |
| RETURN_IF_EXCEPTION(scope, false); |
| if (getOwnPropertyDescriptorMethod.isUndefined()) |
| RELEASE_AND_RETURN(scope, performDefaultGetOwnProperty()); |
| |
| MarkedArgumentBuffer arguments; |
| arguments.append(target); |
| arguments.append(identifierToSafePublicJSValue(vm, Identifier::fromUid(vm, propertyName.uid()))); |
| ASSERT(!arguments.hasOverflowed()); |
| JSValue trapResult = call(globalObject, getOwnPropertyDescriptorMethod, callData, handler, arguments); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| if (!trapResult.isUndefined() && !trapResult.isObject()) { |
| throwTypeError(globalObject, scope, "result of 'getOwnPropertyDescriptor' call should either be an Object or undefined"_s); |
| return false; |
| } |
| |
| PropertyDescriptor targetPropertyDescriptor; |
| bool isTargetPropertyDescriptorDefined = target->getOwnPropertyDescriptor(globalObject, propertyName, targetPropertyDescriptor); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| if (trapResult.isUndefined()) { |
| if (!isTargetPropertyDescriptorDefined) |
| return false; |
| if (!targetPropertyDescriptor.configurable()) { |
| throwTypeError(globalObject, scope, "When the result of 'getOwnPropertyDescriptor' is undefined the target must be configurable"_s); |
| return false; |
| } |
| bool isExtensible = target->isExtensible(globalObject); |
| RETURN_IF_EXCEPTION(scope, false); |
| if (!isExtensible) { |
| throwTypeError(globalObject, scope, "When 'getOwnPropertyDescriptor' returns undefined, the 'target' of a Proxy should be extensible"_s); |
| return false; |
| } |
| |
| return false; |
| } |
| |
| bool isExtensible = target->isExtensible(globalObject); |
| RETURN_IF_EXCEPTION(scope, false); |
| PropertyDescriptor trapResultAsDescriptor; |
| toPropertyDescriptor(globalObject, trapResult, trapResultAsDescriptor); |
| RETURN_IF_EXCEPTION(scope, false); |
| completePropertyDescriptor(trapResultAsDescriptor); |
| bool throwException = false; |
| bool valid = validateAndApplyPropertyDescriptor(globalObject, nullptr, propertyName, isExtensible, |
| trapResultAsDescriptor, isTargetPropertyDescriptorDefined, targetPropertyDescriptor, throwException); |
| RETURN_IF_EXCEPTION(scope, false); |
| if (!valid) { |
| throwTypeError(globalObject, scope, "Result from 'getOwnPropertyDescriptor' fails the IsCompatiblePropertyDescriptor test"_s); |
| return false; |
| } |
| |
| if (!trapResultAsDescriptor.configurable()) { |
| if (!isTargetPropertyDescriptorDefined || targetPropertyDescriptor.configurable()) { |
| throwTypeError(globalObject, scope, "Result from 'getOwnPropertyDescriptor' can't be non-configurable when the 'target' doesn't have it as an own property or if it is a configurable own property on 'target'"_s); |
| return false; |
| } |
| if (trapResultAsDescriptor.writablePresent() && !trapResultAsDescriptor.writable() && targetPropertyDescriptor.writable()) { |
| throwTypeError(globalObject, scope, "Result from 'getOwnPropertyDescriptor' can't be non-configurable and non-writable when the target's property is writable"_s); |
| return false; |
| } |
| } |
| |
| if (trapResultAsDescriptor.isAccessorDescriptor()) { |
| GetterSetter* getterSetter = trapResultAsDescriptor.slowGetterSetter(globalObject); |
| RETURN_IF_EXCEPTION(scope, false); |
| slot.setGetterSlot(this, trapResultAsDescriptor.attributes(), getterSetter); |
| } else if (trapResultAsDescriptor.isDataDescriptor() && !trapResultAsDescriptor.value().isEmpty()) |
| slot.setValue(this, trapResultAsDescriptor.attributes(), trapResultAsDescriptor.value()); |
| else |
| slot.setValue(this, trapResultAsDescriptor.attributes(), jsUndefined()); // We use undefined because it's the default value in object properties. |
| |
| return true; |
| } |
| |
| bool ProxyObject::performHasProperty(JSGlobalObject* globalObject, PropertyName propertyName, PropertySlot& slot) |
| { |
| NO_TAIL_CALLS(); |
| |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| if (UNLIKELY(!vm.isSafeToRecurseSoft())) { |
| throwStackOverflowError(globalObject, scope); |
| return false; |
| } |
| JSObject* target = this->target(); |
| slot.setValue(this, static_cast<unsigned>(PropertyAttribute::None), jsUndefined()); // Nobody should rely on our value, but be safe and protect against any bad actors reading our value. |
| |
| auto performDefaultHasProperty = [&] { |
| return target->getPropertySlot(globalObject, propertyName, slot); |
| }; |
| |
| if (propertyName.isPrivateName()) |
| return false; |
| |
| JSValue handlerValue = this->handler(); |
| if (handlerValue.isNull()) { |
| throwTypeError(globalObject, scope, s_proxyAlreadyRevokedErrorMessage); |
| return false; |
| } |
| |
| JSObject* handler = jsCast<JSObject*>(handlerValue); |
| CallData callData; |
| JSValue hasMethod = handler->getMethod(globalObject, callData, vm.propertyNames->has, "'has' property of a Proxy's handler should be callable"_s); |
| RETURN_IF_EXCEPTION(scope, false); |
| if (hasMethod.isUndefined()) |
| RELEASE_AND_RETURN(scope, performDefaultHasProperty()); |
| |
| MarkedArgumentBuffer arguments; |
| arguments.append(target); |
| arguments.append(identifierToSafePublicJSValue(vm, Identifier::fromUid(vm, propertyName.uid()))); |
| ASSERT(!arguments.hasOverflowed()); |
| JSValue trapResult = call(globalObject, hasMethod, callData, handler, arguments); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| bool trapResultAsBool = trapResult.toBoolean(globalObject); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| if (!trapResultAsBool) { |
| PropertyDescriptor descriptor; |
| bool isPropertyDescriptorDefined = target->getOwnPropertyDescriptor(globalObject, propertyName, descriptor); |
| RETURN_IF_EXCEPTION(scope, false); |
| if (isPropertyDescriptorDefined) { |
| if (!descriptor.configurable()) { |
| throwTypeError(globalObject, scope, "Proxy 'has' must return 'true' for non-configurable properties"_s); |
| return false; |
| } |
| bool isExtensible = target->isExtensible(globalObject); |
| RETURN_IF_EXCEPTION(scope, false); |
| if (!isExtensible) { |
| throwTypeError(globalObject, scope, "Proxy 'has' must return 'true' for a non-extensible 'target' object with a configurable property"_s); |
| return false; |
| } |
| } |
| } |
| |
| return trapResultAsBool; |
| } |
| |
| bool ProxyObject::getOwnPropertySlotCommon(JSGlobalObject* globalObject, PropertyName propertyName, PropertySlot& slot) |
| { |
| slot.disableCaching(); |
| slot.setIsTaintedByOpaqueObject(); |
| |
| if (slot.isVMInquiry()) { |
| slot.setValue(this, static_cast<unsigned>(JSC::PropertyAttribute::None), jsUndefined()); |
| return false; |
| } |
| |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| if (UNLIKELY(!vm.isSafeToRecurseSoft())) { |
| throwStackOverflowError(globalObject, scope); |
| return false; |
| } |
| switch (slot.internalMethodType()) { |
| case PropertySlot::InternalMethodType::Get: |
| RELEASE_AND_RETURN(scope, performGet(globalObject, propertyName, slot)); |
| case PropertySlot::InternalMethodType::GetOwnProperty: |
| RELEASE_AND_RETURN(scope, performInternalMethodGetOwnProperty(globalObject, propertyName, slot)); |
| case PropertySlot::InternalMethodType::HasProperty: |
| RELEASE_AND_RETURN(scope, performHasProperty(globalObject, propertyName, slot)); |
| default: |
| return false; |
| } |
| |
| RELEASE_ASSERT_NOT_REACHED(); |
| return false; |
| } |
| |
| bool ProxyObject::getOwnPropertySlot(JSObject* object, JSGlobalObject* globalObject, PropertyName propertyName, PropertySlot& slot) |
| { |
| ProxyObject* thisObject = jsCast<ProxyObject*>(object); |
| return thisObject->getOwnPropertySlotCommon(globalObject, propertyName, slot); |
| } |
| |
| bool ProxyObject::getOwnPropertySlotByIndex(JSObject* object, JSGlobalObject* globalObject, unsigned propertyName, PropertySlot& slot) |
| { |
| VM& vm = globalObject->vm(); |
| ProxyObject* thisObject = jsCast<ProxyObject*>(object); |
| Identifier ident = Identifier::from(vm, propertyName); |
| return thisObject->getOwnPropertySlotCommon(globalObject, ident.impl(), slot); |
| } |
| |
| template <typename PerformDefaultPutFunction> |
| bool ProxyObject::performPut(JSGlobalObject* globalObject, JSValue putValue, JSValue thisValue, PropertyName propertyName, PerformDefaultPutFunction performDefaultPut, bool shouldThrow) |
| { |
| NO_TAIL_CALLS(); |
| |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| if (UNLIKELY(!vm.isSafeToRecurseSoft())) { |
| throwStackOverflowError(globalObject, scope); |
| return false; |
| } |
| |
| if (propertyName.isPrivateName()) |
| return false; |
| |
| JSValue handlerValue = this->handler(); |
| if (handlerValue.isNull()) { |
| throwTypeError(globalObject, scope, s_proxyAlreadyRevokedErrorMessage); |
| return false; |
| } |
| |
| JSObject* handler = jsCast<JSObject*>(handlerValue); |
| CallData callData; |
| JSValue setMethod = handler->getMethod(globalObject, callData, vm.propertyNames->set, "'set' property of a Proxy's handler should be callable"_s); |
| RETURN_IF_EXCEPTION(scope, false); |
| JSObject* target = this->target(); |
| if (setMethod.isUndefined()) |
| RELEASE_AND_RETURN(scope, performDefaultPut()); |
| |
| MarkedArgumentBuffer arguments; |
| arguments.append(target); |
| arguments.append(identifierToSafePublicJSValue(vm, Identifier::fromUid(vm, propertyName.uid()))); |
| arguments.append(putValue); |
| arguments.append(thisValue); |
| ASSERT(!arguments.hasOverflowed()); |
| JSValue trapResult = call(globalObject, setMethod, callData, handler, arguments); |
| RETURN_IF_EXCEPTION(scope, false); |
| bool trapResultAsBool = trapResult.toBoolean(globalObject); |
| RETURN_IF_EXCEPTION(scope, false); |
| if (!trapResultAsBool) { |
| if (shouldThrow) |
| throwTypeError(globalObject, scope, makeString("Proxy object's 'set' trap returned falsy value for property '", String(propertyName.uid()), "'")); |
| return false; |
| } |
| |
| PropertyDescriptor descriptor; |
| bool hasProperty = target->getOwnPropertyDescriptor(globalObject, propertyName, descriptor); |
| EXCEPTION_ASSERT(!scope.exception() || !hasProperty); |
| if (hasProperty) { |
| if (descriptor.isDataDescriptor() && !descriptor.configurable() && !descriptor.writable()) { |
| bool isSame = sameValue(globalObject, descriptor.value(), putValue); |
| RETURN_IF_EXCEPTION(scope, false); |
| if (!isSame) { |
| throwTypeError(globalObject, scope, "Proxy handler's 'set' on a non-configurable and non-writable property on 'target' should either return false or be the same value already on the 'target'"_s); |
| return false; |
| } |
| } else if (descriptor.isAccessorDescriptor() && !descriptor.configurable() && descriptor.setter().isUndefined()) { |
| throwTypeError(globalObject, scope, "Proxy handler's 'set' method on a non-configurable accessor property without a setter should return false"_s); |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| bool ProxyObject::put(JSCell* cell, JSGlobalObject* globalObject, PropertyName propertyName, JSValue value, PutPropertySlot& slot) |
| { |
| VM& vm = globalObject->vm(); |
| slot.disableCaching(); |
| slot.setIsTaintedByOpaqueObject(); |
| |
| ProxyObject* thisObject = jsCast<ProxyObject*>(cell); |
| auto performDefaultPut = [&] () { |
| JSObject* target = jsCast<JSObject*>(thisObject->target()); |
| return target->methodTable(vm)->put(target, globalObject, propertyName, value, slot); |
| }; |
| return thisObject->performPut(globalObject, value, slot.thisValue(), propertyName, performDefaultPut, slot.isStrictMode()); |
| } |
| |
| bool ProxyObject::putByIndexCommon(JSGlobalObject* globalObject, JSValue thisValue, unsigned propertyName, JSValue putValue, bool shouldThrow) |
| { |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| Identifier ident = Identifier::from(vm, propertyName); |
| RETURN_IF_EXCEPTION(scope, false); |
| auto performDefaultPut = [&] () { |
| JSObject* target = this->target(); |
| bool isStrictMode = shouldThrow; |
| PutPropertySlot slot(thisValue, isStrictMode); // We must preserve the "this" target of the putByIndex. |
| return target->methodTable(vm)->put(target, globalObject, ident.impl(), putValue, slot); |
| }; |
| RELEASE_AND_RETURN(scope, performPut(globalObject, putValue, thisValue, ident.impl(), performDefaultPut, shouldThrow)); |
| } |
| |
| bool ProxyObject::putByIndex(JSCell* cell, JSGlobalObject* globalObject, unsigned propertyName, JSValue value, bool shouldThrow) |
| { |
| ProxyObject* thisObject = jsCast<ProxyObject*>(cell); |
| return thisObject->putByIndexCommon(globalObject, thisObject, propertyName, value, shouldThrow); |
| } |
| |
| JSC_DEFINE_HOST_FUNCTION(performProxyCall, (JSGlobalObject* globalObject, CallFrame* callFrame)) |
| { |
| NO_TAIL_CALLS(); |
| |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| if (UNLIKELY(!vm.isSafeToRecurseSoft())) { |
| throwStackOverflowError(globalObject, scope); |
| return encodedJSValue(); |
| } |
| ProxyObject* proxy = jsCast<ProxyObject*>(callFrame->jsCallee()); |
| JSValue handlerValue = proxy->handler(); |
| if (handlerValue.isNull()) |
| return throwVMTypeError(globalObject, scope, s_proxyAlreadyRevokedErrorMessage); |
| |
| JSObject* handler = jsCast<JSObject*>(handlerValue); |
| CallData callData; |
| JSValue applyMethod = handler->getMethod(globalObject, callData, makeIdentifier(vm, "apply"), "'apply' property of a Proxy's handler should be callable"_s); |
| RETURN_IF_EXCEPTION(scope, encodedJSValue()); |
| JSObject* target = proxy->target(); |
| if (applyMethod.isUndefined()) { |
| auto callData = getCallData(vm, target); |
| RELEASE_ASSERT(callData.type != CallData::Type::None); |
| RELEASE_AND_RETURN(scope, JSValue::encode(call(globalObject, target, callData, callFrame->thisValue(), ArgList(callFrame)))); |
| } |
| |
| JSArray* argArray = constructArray(globalObject, static_cast<ArrayAllocationProfile*>(nullptr), ArgList(callFrame)); |
| RETURN_IF_EXCEPTION(scope, encodedJSValue()); |
| MarkedArgumentBuffer arguments; |
| arguments.append(target); |
| arguments.append(callFrame->thisValue().toThis(globalObject, ECMAMode::strict())); |
| arguments.append(argArray); |
| ASSERT(!arguments.hasOverflowed()); |
| RELEASE_AND_RETURN(scope, JSValue::encode(call(globalObject, applyMethod, callData, handler, arguments))); |
| } |
| |
| CallData ProxyObject::getCallData(JSCell* cell) |
| { |
| CallData callData; |
| ProxyObject* proxy = jsCast<ProxyObject*>(cell); |
| if (proxy->m_isCallable) { |
| callData.type = CallData::Type::Native; |
| callData.native.function = performProxyCall; |
| } |
| return callData; |
| } |
| |
| JSC_DEFINE_HOST_FUNCTION(performProxyConstruct, (JSGlobalObject* globalObject, CallFrame* callFrame)) |
| { |
| NO_TAIL_CALLS(); |
| |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| if (UNLIKELY(!vm.isSafeToRecurseSoft())) { |
| throwStackOverflowError(globalObject, scope); |
| return encodedJSValue(); |
| } |
| ProxyObject* proxy = jsCast<ProxyObject*>(callFrame->jsCallee()); |
| JSValue handlerValue = proxy->handler(); |
| if (handlerValue.isNull()) |
| return throwVMTypeError(globalObject, scope, s_proxyAlreadyRevokedErrorMessage); |
| |
| JSObject* handler = jsCast<JSObject*>(handlerValue); |
| CallData callData; |
| JSValue constructMethod = handler->getMethod(globalObject, callData, makeIdentifier(vm, "construct"), "'construct' property of a Proxy's handler should be callable"_s); |
| RETURN_IF_EXCEPTION(scope, encodedJSValue()); |
| JSObject* target = proxy->target(); |
| if (constructMethod.isUndefined()) { |
| auto constructData = getConstructData(vm, target); |
| RELEASE_ASSERT(constructData.type != CallData::Type::None); |
| RELEASE_AND_RETURN(scope, JSValue::encode(construct(globalObject, target, constructData, ArgList(callFrame), callFrame->newTarget()))); |
| } |
| |
| JSArray* argArray = constructArray(globalObject, static_cast<ArrayAllocationProfile*>(nullptr), ArgList(callFrame)); |
| RETURN_IF_EXCEPTION(scope, encodedJSValue()); |
| MarkedArgumentBuffer arguments; |
| arguments.append(target); |
| arguments.append(argArray); |
| arguments.append(callFrame->newTarget()); |
| ASSERT(!arguments.hasOverflowed()); |
| JSValue result = call(globalObject, constructMethod, callData, handler, arguments); |
| RETURN_IF_EXCEPTION(scope, encodedJSValue()); |
| if (!result.isObject()) |
| return throwVMTypeError(globalObject, scope, "Result from Proxy handler's 'construct' method should be an object"_s); |
| return JSValue::encode(result); |
| } |
| |
| CallData ProxyObject::getConstructData(JSCell* cell) |
| { |
| CallData constructData; |
| ProxyObject* proxy = jsCast<ProxyObject*>(cell); |
| if (proxy->m_isConstructible) { |
| constructData.type = CallData::Type::Native; |
| constructData.native.function = performProxyConstruct; |
| } |
| return constructData; |
| } |
| |
| template <typename DefaultDeleteFunction> |
| bool ProxyObject::performDelete(JSGlobalObject* globalObject, PropertyName propertyName, DefaultDeleteFunction performDefaultDelete) |
| { |
| NO_TAIL_CALLS(); |
| |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| if (UNLIKELY(!vm.isSafeToRecurseSoft())) { |
| throwStackOverflowError(globalObject, scope); |
| return false; |
| } |
| |
| if (propertyName.isPrivateName()) |
| return false; |
| |
| JSValue handlerValue = this->handler(); |
| if (handlerValue.isNull()) { |
| throwTypeError(globalObject, scope, s_proxyAlreadyRevokedErrorMessage); |
| return false; |
| } |
| |
| JSObject* handler = jsCast<JSObject*>(handlerValue); |
| CallData callData; |
| JSValue deletePropertyMethod = handler->getMethod(globalObject, callData, makeIdentifier(vm, "deleteProperty"), "'deleteProperty' property of a Proxy's handler should be callable"_s); |
| RETURN_IF_EXCEPTION(scope, false); |
| JSObject* target = this->target(); |
| if (deletePropertyMethod.isUndefined()) |
| RELEASE_AND_RETURN(scope, performDefaultDelete()); |
| |
| MarkedArgumentBuffer arguments; |
| arguments.append(target); |
| arguments.append(identifierToSafePublicJSValue(vm, Identifier::fromUid(vm, propertyName.uid()))); |
| ASSERT(!arguments.hasOverflowed()); |
| JSValue trapResult = call(globalObject, deletePropertyMethod, callData, handler, arguments); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| bool trapResultAsBool = trapResult.toBoolean(globalObject); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| if (!trapResultAsBool) |
| return false; |
| |
| PropertyDescriptor descriptor; |
| bool result = target->getOwnPropertyDescriptor(globalObject, propertyName, descriptor); |
| EXCEPTION_ASSERT(!scope.exception() || !result); |
| if (result) { |
| if (!descriptor.configurable()) { |
| throwTypeError(globalObject, scope, "Proxy handler's 'deleteProperty' method should return false when the target's property is not configurable"_s); |
| return false; |
| } |
| bool targetIsExtensible = target->isExtensible(globalObject); |
| RETURN_IF_EXCEPTION(scope, false); |
| if (!targetIsExtensible) { |
| throwTypeError(globalObject, scope, "Proxy handler's 'deleteProperty' method should return false when the target has property and is not extensible"_s); |
| return false; |
| } |
| } |
| |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| return true; |
| } |
| |
| bool ProxyObject::deleteProperty(JSCell* cell, JSGlobalObject* globalObject, PropertyName propertyName, DeletePropertySlot& slot) |
| { |
| ProxyObject* thisObject = jsCast<ProxyObject*>(cell); |
| auto performDefaultDelete = [&] () -> bool { |
| JSObject* target = thisObject->target(); |
| return target->methodTable(globalObject->vm())->deleteProperty(target, globalObject, propertyName, slot); |
| }; |
| return thisObject->performDelete(globalObject, propertyName, performDefaultDelete); |
| } |
| |
| bool ProxyObject::deletePropertyByIndex(JSCell* cell, JSGlobalObject* globalObject, unsigned propertyName) |
| { |
| VM& vm = globalObject->vm(); |
| ProxyObject* thisObject = jsCast<ProxyObject*>(cell); |
| Identifier ident = Identifier::from(vm, propertyName); |
| auto performDefaultDelete = [&] () -> bool { |
| JSObject* target = thisObject->target(); |
| return target->methodTable(vm)->deletePropertyByIndex(target, globalObject, propertyName); |
| }; |
| return thisObject->performDelete(globalObject, ident.impl(), performDefaultDelete); |
| } |
| |
| bool ProxyObject::performPreventExtensions(JSGlobalObject* globalObject) |
| { |
| NO_TAIL_CALLS(); |
| |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| if (UNLIKELY(!vm.isSafeToRecurseSoft())) { |
| throwStackOverflowError(globalObject, scope); |
| return false; |
| } |
| |
| JSValue handlerValue = this->handler(); |
| if (handlerValue.isNull()) { |
| throwTypeError(globalObject, scope, s_proxyAlreadyRevokedErrorMessage); |
| return false; |
| } |
| |
| JSObject* handler = jsCast<JSObject*>(handlerValue); |
| CallData callData; |
| JSValue preventExtensionsMethod = handler->getMethod(globalObject, callData, makeIdentifier(vm, "preventExtensions"), "'preventExtensions' property of a Proxy's handler should be callable"_s); |
| RETURN_IF_EXCEPTION(scope, false); |
| JSObject* target = this->target(); |
| if (preventExtensionsMethod.isUndefined()) |
| RELEASE_AND_RETURN(scope, target->methodTable(vm)->preventExtensions(target, globalObject)); |
| |
| MarkedArgumentBuffer arguments; |
| arguments.append(target); |
| ASSERT(!arguments.hasOverflowed()); |
| JSValue trapResult = call(globalObject, preventExtensionsMethod, callData, handler, arguments); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| bool trapResultAsBool = trapResult.toBoolean(globalObject); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| if (trapResultAsBool) { |
| bool targetIsExtensible = target->isExtensible(globalObject); |
| RETURN_IF_EXCEPTION(scope, false); |
| if (targetIsExtensible) { |
| throwTypeError(globalObject, scope, "Proxy's 'preventExtensions' trap returned true even though its target is extensible. It should have returned false"_s); |
| return false; |
| } |
| } |
| |
| return trapResultAsBool; |
| } |
| |
| bool ProxyObject::preventExtensions(JSObject* object, JSGlobalObject* globalObject) |
| { |
| return jsCast<ProxyObject*>(object)->performPreventExtensions(globalObject); |
| } |
| |
| bool ProxyObject::performIsExtensible(JSGlobalObject* globalObject) |
| { |
| NO_TAIL_CALLS(); |
| |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| if (UNLIKELY(!vm.isSafeToRecurseSoft())) { |
| throwStackOverflowError(globalObject, scope); |
| return false; |
| } |
| |
| JSValue handlerValue = this->handler(); |
| if (handlerValue.isNull()) { |
| throwTypeError(globalObject, scope, s_proxyAlreadyRevokedErrorMessage); |
| return false; |
| } |
| |
| JSObject* handler = jsCast<JSObject*>(handlerValue); |
| CallData callData; |
| JSValue isExtensibleMethod = handler->getMethod(globalObject, callData, makeIdentifier(vm, "isExtensible"), "'isExtensible' property of a Proxy's handler should be callable"_s); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| JSObject* target = this->target(); |
| if (isExtensibleMethod.isUndefined()) |
| RELEASE_AND_RETURN(scope, target->isExtensible(globalObject)); |
| |
| MarkedArgumentBuffer arguments; |
| arguments.append(target); |
| ASSERT(!arguments.hasOverflowed()); |
| JSValue trapResult = call(globalObject, isExtensibleMethod, callData, handler, arguments); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| bool trapResultAsBool = trapResult.toBoolean(globalObject); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| bool isTargetExtensible = target->isExtensible(globalObject); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| if (trapResultAsBool != isTargetExtensible) { |
| if (isTargetExtensible) { |
| ASSERT(!trapResultAsBool); |
| throwTypeError(globalObject, scope, "Proxy object's 'isExtensible' trap returned false when the target is extensible. It should have returned true"_s); |
| } else { |
| ASSERT(!isTargetExtensible); |
| ASSERT(trapResultAsBool); |
| throwTypeError(globalObject, scope, "Proxy object's 'isExtensible' trap returned true when the target is non-extensible. It should have returned false"_s); |
| } |
| } |
| |
| return trapResultAsBool; |
| } |
| |
| bool ProxyObject::isExtensible(JSObject* object, JSGlobalObject* globalObject) |
| { |
| return jsCast<ProxyObject*>(object)->performIsExtensible(globalObject); |
| } |
| |
| bool ProxyObject::performDefineOwnProperty(JSGlobalObject* globalObject, PropertyName propertyName, const PropertyDescriptor& descriptor, bool shouldThrow) |
| { |
| NO_TAIL_CALLS(); |
| |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| if (UNLIKELY(!vm.isSafeToRecurseSoft())) { |
| throwStackOverflowError(globalObject, scope); |
| return false; |
| } |
| |
| JSObject* target = this->target(); |
| auto performDefaultDefineOwnProperty = [&] { |
| RELEASE_AND_RETURN(scope, target->methodTable(vm)->defineOwnProperty(target, globalObject, propertyName, descriptor, shouldThrow)); |
| }; |
| |
| if (propertyName.isPrivateName()) |
| return false; |
| |
| JSValue handlerValue = this->handler(); |
| if (handlerValue.isNull()) { |
| throwTypeError(globalObject, scope, s_proxyAlreadyRevokedErrorMessage); |
| return false; |
| } |
| |
| JSObject* handler = jsCast<JSObject*>(handlerValue); |
| CallData callData; |
| JSValue definePropertyMethod = handler->getMethod(globalObject, callData, vm.propertyNames->defineProperty, "'defineProperty' property of a Proxy's handler should be callable"_s); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| if (definePropertyMethod.isUndefined()) |
| return performDefaultDefineOwnProperty(); |
| |
| JSObject* descriptorObject = constructObjectFromPropertyDescriptor(globalObject, descriptor); |
| scope.assertNoException(); |
| ASSERT(descriptorObject); |
| |
| MarkedArgumentBuffer arguments; |
| arguments.append(target); |
| arguments.append(identifierToSafePublicJSValue(vm, Identifier::fromUid(vm, propertyName.uid()))); |
| arguments.append(descriptorObject); |
| ASSERT(!arguments.hasOverflowed()); |
| JSValue trapResult = call(globalObject, definePropertyMethod, callData, handler, arguments); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| bool trapResultAsBool = trapResult.toBoolean(globalObject); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| if (!trapResultAsBool) { |
| if (shouldThrow) |
| throwTypeError(globalObject, scope, makeString("Proxy's 'defineProperty' trap returned falsy value for property '", String(propertyName.uid()), "'")); |
| return false; |
| } |
| |
| PropertyDescriptor targetDescriptor; |
| bool isTargetDescriptorDefined = target->getOwnPropertyDescriptor(globalObject, propertyName, targetDescriptor); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| bool targetIsExtensible = target->isExtensible(globalObject); |
| RETURN_IF_EXCEPTION(scope, false); |
| bool settingConfigurableToFalse = descriptor.configurablePresent() && !descriptor.configurable(); |
| |
| if (!isTargetDescriptorDefined) { |
| if (!targetIsExtensible) { |
| throwTypeError(globalObject, scope, "Proxy's 'defineProperty' trap returned true even though getOwnPropertyDescriptor of the Proxy's target returned undefined and the target is non-extensible"_s); |
| return false; |
| } |
| if (settingConfigurableToFalse) { |
| throwTypeError(globalObject, scope, "Proxy's 'defineProperty' trap returned true for a non-configurable field even though getOwnPropertyDescriptor of the Proxy's target returned undefined"_s); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| ASSERT(isTargetDescriptorDefined); |
| bool isCurrentDefined = isTargetDescriptorDefined; |
| const PropertyDescriptor& current = targetDescriptor; |
| bool throwException = false; |
| bool isCompatibleDescriptor = validateAndApplyPropertyDescriptor(globalObject, nullptr, propertyName, targetIsExtensible, descriptor, isCurrentDefined, current, throwException); |
| RETURN_IF_EXCEPTION(scope, false); |
| if (!isCompatibleDescriptor) { |
| throwTypeError(globalObject, scope, "Proxy's 'defineProperty' trap did not define a property on its target that is compatible with the trap's input descriptor"_s); |
| return false; |
| } |
| if (settingConfigurableToFalse && targetDescriptor.configurable()) { |
| throwTypeError(globalObject, scope, "Proxy's 'defineProperty' trap did not define a non-configurable property on its target even though the input descriptor to the trap said it must do so"_s); |
| return false; |
| } |
| if (targetDescriptor.isDataDescriptor() && !targetDescriptor.configurable() && targetDescriptor.writable()) { |
| if (descriptor.writablePresent() && !descriptor.writable()) { |
| throwTypeError(globalObject, scope, "Proxy's 'defineProperty' trap returned true for a non-writable input descriptor when the target's property is non-configurable and writable"_s); |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| bool ProxyObject::defineOwnProperty(JSObject* object, JSGlobalObject* globalObject, PropertyName propertyName, const PropertyDescriptor& descriptor, bool shouldThrow) |
| { |
| ProxyObject* thisObject = jsCast<ProxyObject*>(object); |
| return thisObject->performDefineOwnProperty(globalObject, propertyName, descriptor, shouldThrow); |
| } |
| |
| void ProxyObject::performGetOwnPropertyNames(JSGlobalObject* globalObject, PropertyNameArray& propertyNames) |
| { |
| NO_TAIL_CALLS(); |
| |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| if (UNLIKELY(!vm.isSafeToRecurseSoft())) { |
| throwStackOverflowError(globalObject, scope); |
| return; |
| } |
| JSValue handlerValue = this->handler(); |
| if (handlerValue.isNull()) { |
| throwTypeError(globalObject, scope, s_proxyAlreadyRevokedErrorMessage); |
| return; |
| } |
| |
| JSObject* handler = jsCast<JSObject*>(handlerValue); |
| CallData callData; |
| JSValue ownKeysMethod = handler->getMethod(globalObject, callData, makeIdentifier(vm, "ownKeys"), "'ownKeys' property of a Proxy's handler should be callable"_s); |
| RETURN_IF_EXCEPTION(scope, void()); |
| JSObject* target = this->target(); |
| if (ownKeysMethod.isUndefined()) { |
| scope.release(); |
| target->methodTable(vm)->getOwnPropertyNames(target, globalObject, propertyNames, DontEnumPropertiesMode::Include); |
| return; |
| } |
| |
| MarkedArgumentBuffer arguments; |
| arguments.append(target); |
| ASSERT(!arguments.hasOverflowed()); |
| JSValue trapResult = call(globalObject, ownKeysMethod, callData, handler, arguments); |
| RETURN_IF_EXCEPTION(scope, void()); |
| |
| if (!trapResult.isObject()) { |
| throwTypeError(globalObject, scope, "Proxy handler's 'ownKeys' method must return an object"_s); |
| return; |
| } |
| |
| HashSet<UniquedStringImpl*> uncheckedResultKeys; |
| forEachInArrayLike(globalObject, asObject(trapResult), [&] (JSValue value) -> bool { |
| if (!value.isString() && !value.isSymbol()) { |
| throwTypeError(globalObject, scope, "Proxy handler's 'ownKeys' method must return an array-like object containing only Strings and Symbols"_s); |
| return false; |
| } |
| |
| Identifier ident = value.toPropertyKey(globalObject); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| if (!uncheckedResultKeys.add(ident.impl()).isNewEntry) { |
| throwTypeError(globalObject, scope, "Proxy handler's 'ownKeys' trap result must not contain any duplicate names"_s); |
| return false; |
| } |
| |
| propertyNames.add(ident); |
| return true; |
| }); |
| RETURN_IF_EXCEPTION(scope, void()); |
| |
| bool targetIsExensible = target->isExtensible(globalObject); |
| RETURN_IF_EXCEPTION(scope, void()); |
| |
| PropertyNameArray targetKeys(vm, PropertyNameMode::StringsAndSymbols, PrivateSymbolMode::Exclude); |
| target->methodTable(vm)->getOwnPropertyNames(target, globalObject, targetKeys, DontEnumPropertiesMode::Include); |
| RETURN_IF_EXCEPTION(scope, void()); |
| HashSet<UniquedStringImpl*> targetNonConfigurableKeys; |
| HashSet<UniquedStringImpl*> targetConfigurableKeys; |
| for (const Identifier& ident : targetKeys) { |
| PropertyDescriptor descriptor; |
| bool isPropertyDefined = target->getOwnPropertyDescriptor(globalObject, ident.impl(), descriptor); |
| RETURN_IF_EXCEPTION(scope, void()); |
| if (isPropertyDefined && !descriptor.configurable()) |
| targetNonConfigurableKeys.add(ident.impl()); |
| else if (!targetIsExensible) |
| targetConfigurableKeys.add(ident.impl()); |
| } |
| |
| for (UniquedStringImpl* impl : targetNonConfigurableKeys) { |
| if (!uncheckedResultKeys.remove(impl)) { |
| throwTypeError(globalObject, scope, makeString("Proxy object's 'target' has the non-configurable property '", String(impl), "' that was not in the result from the 'ownKeys' trap")); |
| return; |
| } |
| } |
| |
| if (!targetIsExensible) { |
| for (UniquedStringImpl* impl : targetConfigurableKeys) { |
| if (!uncheckedResultKeys.remove(impl)) { |
| throwTypeError(globalObject, scope, makeString("Proxy object's non-extensible 'target' has configurable property '", String(impl), "' that was not in the result from the 'ownKeys' trap")); |
| return; |
| } |
| } |
| |
| if (uncheckedResultKeys.size()) { |
| throwTypeError(globalObject, scope, "Proxy handler's 'ownKeys' method returned a key that was not present in its non-extensible target"_s); |
| return; |
| } |
| } |
| } |
| |
| void ProxyObject::performGetOwnEnumerablePropertyNames(JSGlobalObject* globalObject, PropertyNameArray& propertyNames) |
| { |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| |
| PropertyNameArray unfilteredNames(vm, propertyNames.propertyNameMode(), propertyNames.privateSymbolMode()); |
| performGetOwnPropertyNames(globalObject, unfilteredNames); |
| RETURN_IF_EXCEPTION(scope, void()); |
| // Filtering DontEnum properties is observable in proxies and must occur after the invariant checks pass. |
| for (const auto& propertyName : unfilteredNames) { |
| PropertySlot slot(this, PropertySlot::InternalMethodType::GetOwnProperty); |
| auto isPropertyDefined = getOwnPropertySlotCommon(globalObject, propertyName, slot); |
| RETURN_IF_EXCEPTION(scope, void()); |
| if (!isPropertyDefined) |
| continue; |
| if (slot.attributes() & PropertyAttribute::DontEnum) |
| continue; |
| propertyNames.add(propertyName.impl()); |
| } |
| } |
| |
| void ProxyObject::getOwnPropertyNames(JSObject* object, JSGlobalObject* globalObject, PropertyNameArray& propertyNameArray, DontEnumPropertiesMode mode) |
| { |
| ProxyObject* thisObject = jsCast<ProxyObject*>(object); |
| if (mode == DontEnumPropertiesMode::Include) |
| thisObject->performGetOwnPropertyNames(globalObject, propertyNameArray); |
| else |
| thisObject->performGetOwnEnumerablePropertyNames(globalObject, propertyNameArray); |
| } |
| |
| bool ProxyObject::performSetPrototype(JSGlobalObject* globalObject, JSValue prototype, bool shouldThrowIfCantSet) |
| { |
| NO_TAIL_CALLS(); |
| |
| ASSERT(prototype.isObject() || prototype.isNull()); |
| |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| if (UNLIKELY(!vm.isSafeToRecurseSoft())) { |
| throwStackOverflowError(globalObject, scope); |
| return false; |
| } |
| |
| JSValue handlerValue = this->handler(); |
| if (handlerValue.isNull()) { |
| throwTypeError(globalObject, scope, s_proxyAlreadyRevokedErrorMessage); |
| return false; |
| } |
| |
| JSObject* handler = jsCast<JSObject*>(handlerValue); |
| CallData callData; |
| JSValue setPrototypeOfMethod = handler->getMethod(globalObject, callData, makeIdentifier(vm, "setPrototypeOf"), "'setPrototypeOf' property of a Proxy's handler should be callable"_s); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| JSObject* target = this->target(); |
| if (setPrototypeOfMethod.isUndefined()) |
| RELEASE_AND_RETURN(scope, target->setPrototype(vm, globalObject, prototype, shouldThrowIfCantSet)); |
| |
| MarkedArgumentBuffer arguments; |
| arguments.append(target); |
| arguments.append(prototype); |
| ASSERT(!arguments.hasOverflowed()); |
| JSValue trapResult = call(globalObject, setPrototypeOfMethod, callData, handler, arguments); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| bool trapResultAsBool = trapResult.toBoolean(globalObject); |
| RETURN_IF_EXCEPTION(scope, false); |
| |
| if (!trapResultAsBool) { |
| if (shouldThrowIfCantSet) |
| throwTypeError(globalObject, scope, "Proxy 'setPrototypeOf' returned false indicating it could not set the prototype value. The operation was expected to succeed"_s); |
| return false; |
| } |
| |
| bool targetIsExtensible = target->isExtensible(globalObject); |
| RETURN_IF_EXCEPTION(scope, false); |
| if (targetIsExtensible) |
| return true; |
| |
| JSValue targetPrototype = target->getPrototype(vm, globalObject); |
| RETURN_IF_EXCEPTION(scope, false); |
| bool isSame = sameValue(globalObject, prototype, targetPrototype); |
| RETURN_IF_EXCEPTION(scope, false); |
| if (!isSame) { |
| throwTypeError(globalObject, scope, "Proxy 'setPrototypeOf' trap returned true when its target is non-extensible and the new prototype value is not the same as the current prototype value. It should have returned false"_s); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool ProxyObject::setPrototype(JSObject* object, JSGlobalObject* globalObject, JSValue prototype, bool shouldThrowIfCantSet) |
| { |
| return jsCast<ProxyObject*>(object)->performSetPrototype(globalObject, prototype, shouldThrowIfCantSet); |
| } |
| |
| JSValue ProxyObject::performGetPrototype(JSGlobalObject* globalObject) |
| { |
| NO_TAIL_CALLS(); |
| |
| VM& vm = globalObject->vm(); |
| auto scope = DECLARE_THROW_SCOPE(vm); |
| if (UNLIKELY(!vm.isSafeToRecurseSoft())) { |
| throwStackOverflowError(globalObject, scope); |
| return { }; |
| } |
| |
| JSValue handlerValue = this->handler(); |
| if (handlerValue.isNull()) { |
| throwTypeError(globalObject, scope, s_proxyAlreadyRevokedErrorMessage); |
| return { }; |
| } |
| |
| JSObject* handler = jsCast<JSObject*>(handlerValue); |
| CallData callData; |
| JSValue getPrototypeOfMethod = handler->getMethod(globalObject, callData, makeIdentifier(vm, "getPrototypeOf"), "'getPrototypeOf' property of a Proxy's handler should be callable"_s); |
| RETURN_IF_EXCEPTION(scope, { }); |
| |
| JSObject* target = this->target(); |
| if (getPrototypeOfMethod.isUndefined()) |
| RELEASE_AND_RETURN(scope, target->getPrototype(vm, globalObject)); |
| |
| MarkedArgumentBuffer arguments; |
| arguments.append(target); |
| ASSERT(!arguments.hasOverflowed()); |
| JSValue trapResult = call(globalObject, getPrototypeOfMethod, callData, handler, arguments); |
| RETURN_IF_EXCEPTION(scope, { }); |
| |
| if (!trapResult.isObject() && !trapResult.isNull()) { |
| throwTypeError(globalObject, scope, "Proxy handler's 'getPrototypeOf' trap should either return an object or null"_s); |
| return { }; |
| } |
| |
| bool targetIsExtensible = target->isExtensible(globalObject); |
| RETURN_IF_EXCEPTION(scope, { }); |
| if (targetIsExtensible) |
| return trapResult; |
| |
| JSValue targetPrototype = target->getPrototype(vm, globalObject); |
| RETURN_IF_EXCEPTION(scope, { }); |
| bool isSame = sameValue(globalObject, targetPrototype, trapResult); |
| RETURN_IF_EXCEPTION(scope, { }); |
| if (!isSame) { |
| throwTypeError(globalObject, scope, "Proxy's 'getPrototypeOf' trap for a non-extensible target should return the same value as the target's prototype"_s); |
| return { }; |
| } |
| |
| return trapResult; |
| } |
| |
| JSValue ProxyObject::getPrototype(JSObject* object, JSGlobalObject* globalObject) |
| { |
| return jsCast<ProxyObject*>(object)->performGetPrototype(globalObject); |
| } |
| |
| void ProxyObject::revoke(VM& vm) |
| { |
| // This should only ever be called once and we should strictly transition from Object to null. |
| RELEASE_ASSERT(!m_handler.get().isNull() && m_handler.get().isObject()); |
| m_handler.set(vm, this, jsNull()); |
| } |
| |
| bool ProxyObject::isRevoked() const |
| { |
| return handler().isNull(); |
| } |
| |
| template<typename Visitor> |
| void ProxyObject::visitChildrenImpl(JSCell* cell, Visitor& visitor) |
| { |
| ProxyObject* thisObject = jsCast<ProxyObject*>(cell); |
| ASSERT_GC_OBJECT_INHERITS(thisObject, info()); |
| Base::visitChildren(thisObject, visitor); |
| |
| visitor.append(thisObject->m_target); |
| visitor.append(thisObject->m_handler); |
| } |
| |
| DEFINE_VISIT_CHILDREN(ProxyObject); |
| |
| } // namespace JSC |
