Source/WebCore/bridge/runtime_object.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2003-2022 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 "runtime_object.h"

 #include "JSDOMBinding.h"
 #include "WebCoreJSClientData.h"
 #include "runtime_method.h"
 #include <JavaScriptCore/Error.h>

 using namespace WebCore;

 namespace JSC {
 namespace Bindings {

 WEBCORE_EXPORT const ClassInfo RuntimeObject::s_info = { "RuntimeObject"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(RuntimeObject) };

 static JSC_DECLARE_HOST_FUNCTION(convertRuntimeObjectToPrimitive);
 static JSC_DECLARE_HOST_FUNCTION(callRuntimeObject);
 static JSC_DECLARE_HOST_FUNCTION(callRuntimeConstructor);

 static JSC_DECLARE_CUSTOM_GETTER(fallbackObjectGetter);
 static JSC_DECLARE_CUSTOM_GETTER(fieldGetter);
 static JSC_DECLARE_CUSTOM_GETTER(methodGetter);

 RuntimeObject::RuntimeObject(VM& vm, Structure* structure, RefPtr<Instance>&& instance)
     : Base(vm, structure)
     , m_instance(WTFMove(instance))
 {
 }

 void RuntimeObject::finishCreation(VM& vm)
 {
     Base::finishCreation(vm);
     ASSERT(inherits(info()));
     putDirect(vm, vm.propertyNames->toPrimitiveSymbol,
         JSFunction::create(vm, globalObject(), 1, "[Symbol.toPrimitive]"_s, convertRuntimeObjectToPrimitive),
         static_cast<unsigned>(PropertyAttribute::DontEnum));
 }

 void RuntimeObject::destroy(JSCell* cell)
 {
     static_cast<RuntimeObject*>(cell)->RuntimeObject::~RuntimeObject();
 }

 void RuntimeObject::invalidate()
 {
     ASSERT(m_instance);
     if (m_instance)
         m_instance->willInvalidateRuntimeObject();
     m_instance = nullptr;
 }

 JSC_DEFINE_CUSTOM_GETTER(fallbackObjectGetter, (JSGlobalObject* lexicalGlobalObject, EncodedJSValue thisValue, PropertyName propertyName))
 {
     VM& vm = lexicalGlobalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     RuntimeObject* thisObj = jsCast<RuntimeObject*>(JSValue::decode(thisValue));
     RefPtr<Instance> instance = thisObj->getInternalInstance();

     if (!instance)
         return JSValue::encode(throwRuntimeObjectInvalidAccessError(lexicalGlobalObject, scope));

     instance->begin();

     Class *aClass = instance->getClass();
     JSValue result = aClass->fallbackObject(lexicalGlobalObject, instance.get(), propertyName);

     instance->end();

     return JSValue::encode(result);
 }

 JSC_DEFINE_CUSTOM_GETTER(fieldGetter, (JSGlobalObject* lexicalGlobalObject, EncodedJSValue thisValue, PropertyName propertyName))
 {
     VM& vm = lexicalGlobalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     RuntimeObject* thisObj = jsCast<RuntimeObject*>(JSValue::decode(thisValue));
     RefPtr<Instance> instance = thisObj->getInternalInstance();

     if (!instance)
         return JSValue::encode(throwRuntimeObjectInvalidAccessError(lexicalGlobalObject, scope));

     instance->begin();

     Class *aClass = instance->getClass();
     Field* aField = aClass->fieldNamed(propertyName, instance.get());
     JSValue result = aField->valueFromInstance(lexicalGlobalObject, instance.get());

     instance->end();

     return JSValue::encode(result);
 }

 JSC_DEFINE_CUSTOM_GETTER(methodGetter, (JSGlobalObject* lexicalGlobalObject, EncodedJSValue thisValue, PropertyName propertyName))
 {
     VM& vm = lexicalGlobalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     RuntimeObject* thisObj = jsCast<RuntimeObject*>(JSValue::decode(thisValue));
     RefPtr<Instance> instance = thisObj->getInternalInstance();

     if (!instance)
         return JSValue::encode(throwRuntimeObjectInvalidAccessError(lexicalGlobalObject, scope));

     instance->begin();

     JSValue method = instance->getMethod(lexicalGlobalObject, propertyName);

     instance->end();

     return JSValue::encode(method);
 }

 bool RuntimeObject::getOwnPropertySlot(JSObject* object, JSGlobalObject* lexicalGlobalObject, PropertyName propertyName, PropertySlot& slot)
 {
     VM& vm = lexicalGlobalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     RuntimeObject* thisObject = jsCast<RuntimeObject*>(object);
     if (!thisObject->m_instance) {
         throwRuntimeObjectInvalidAccessError(lexicalGlobalObject, scope);
         return false;
     }

     if (propertyName.uid() == vm.propertyNames->toPrimitiveSymbol.impl())
         return JSObject::getOwnPropertySlot(thisObject, lexicalGlobalObject, propertyName, slot);

     RefPtr<Instance> instance = thisObject->m_instance;

     instance->begin();

     Class *aClass = instance->getClass();

     if (aClass) {
         // See if the instance has a field with the specified name.
         Field *aField = aClass->fieldNamed(propertyName, instance.get());
         if (aField) {
             slot.setCustom(thisObject, static_cast<unsigned>(JSC::PropertyAttribute::DontDelete), fieldGetter);
             instance->end();
             return true;
         } else {
             // Now check if a method with specified name exists, if so return a function object for
             // that method.
             if (aClass->methodNamed(propertyName, instance.get())) {
                 slot.setCustom(thisObject, PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly, methodGetter);

                 instance->end();
                 return true;
             }
         }

         // Try a fallback object.
         if (!aClass->fallbackObject(lexicalGlobalObject, instance.get(), propertyName).isUndefined()) {
             slot.setCustom(thisObject, PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum, fallbackObjectGetter);
             instance->end();
             return true;
         }
     }

     instance->end();

     return instance->getOwnPropertySlot(thisObject, lexicalGlobalObject, propertyName, slot);
 }

 bool RuntimeObject::put(JSCell* cell, JSGlobalObject* lexicalGlobalObject, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
 {
     VM& vm = lexicalGlobalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     RuntimeObject* thisObject = jsCast<RuntimeObject*>(cell);
     if (!thisObject->m_instance) {
         throwRuntimeObjectInvalidAccessError(lexicalGlobalObject, scope);
         return false;
     }

     RefPtr<Instance> instance = thisObject->m_instance;
     instance->begin();

     // Set the value of the property.
     bool result = false;
     Field *aField = instance->getClass()->fieldNamed(propertyName, instance.get());
     if (aField)
         result = aField->setValueToInstance(lexicalGlobalObject, instance.get(), value);
     else if (!instance->setValueOfUndefinedField(lexicalGlobalObject, propertyName, value))
         result = instance->put(thisObject, lexicalGlobalObject, propertyName, value, slot);

     instance->end();
     return result;
 }

 bool RuntimeObject::deleteProperty(JSCell*, JSGlobalObject*, PropertyName, DeletePropertySlot&)
 {
     // Can never remove a property of a RuntimeObject.
     return false;
 }

 JSC_DEFINE_HOST_FUNCTION(convertRuntimeObjectToPrimitive, (JSGlobalObject* lexicalGlobalObject, CallFrame* callFrame))
 {
     VM& vm = lexicalGlobalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     auto* thisObject = jsDynamicCast<RuntimeObject*>(callFrame->thisValue());
     if (!thisObject)
         return throwVMTypeError(lexicalGlobalObject, scope, "RuntimeObject[Symbol.toPrimitive] method called on incompatible |this| value."_s);
     RefPtr instance = thisObject->getInternalInstance();
     if (!instance)
         return JSValue::encode(throwRuntimeObjectInvalidAccessError(lexicalGlobalObject, scope));
     auto hint = toPreferredPrimitiveType(lexicalGlobalObject, callFrame->argument(0));
     RETURN_IF_EXCEPTION(scope, { });

     instance->begin();
     JSValue result = instance->defaultValue(lexicalGlobalObject, hint);
     instance->end();
     return JSValue::encode(result);
 }

 JSC_DEFINE_HOST_FUNCTION(callRuntimeObject, (JSGlobalObject* globalObject, CallFrame* callFrame))
 {
     ASSERT_UNUSED(globalObject, callFrame->jsCallee()->inherits<RuntimeObject>());
     RefPtr<Instance> instance(static_cast<RuntimeObject*>(callFrame->jsCallee())->getInternalInstance());
     instance->begin();
     JSValue result = instance->invokeDefaultMethod(globalObject, callFrame);
     instance->end();
     return JSValue::encode(result);
 }

 CallData RuntimeObject::getCallData(JSCell* cell)
 {
     CallData callData;

     RuntimeObject* thisObject = jsCast<RuntimeObject*>(cell);
     if (thisObject->m_instance && thisObject->m_instance->supportsInvokeDefaultMethod()) {
         callData.type = CallData::Type::Native;
         callData.native.function = callRuntimeObject;
     }

     return callData;
 }

 JSC_DEFINE_HOST_FUNCTION(callRuntimeConstructor, (JSGlobalObject* globalObject, CallFrame* callFrame))
 {
     JSObject* constructor = callFrame->jsCallee();
     ASSERT_UNUSED(globalObject, constructor->inherits<RuntimeObject>());
     RefPtr<Instance> instance(static_cast<RuntimeObject*>(callFrame->jsCallee())->getInternalInstance());
     instance->begin();
     ArgList args(callFrame);
     JSValue result = instance->invokeConstruct(globalObject, callFrame, args);
     instance->end();

     ASSERT(result);
     return JSValue::encode(result.isObject() ? jsCast<JSObject*>(result.asCell()) : constructor);
 }

 CallData RuntimeObject::getConstructData(JSCell* cell)
 {
     CallData constructData;

     RuntimeObject* thisObject = jsCast<RuntimeObject*>(cell);
     if (thisObject->m_instance && thisObject->m_instance->supportsConstruct()) {
         constructData.type = CallData::Type::Native;
         constructData.native.function = callRuntimeConstructor;
     }

     return constructData;
 }

 void RuntimeObject::getOwnPropertyNames(JSObject* object, JSGlobalObject* lexicalGlobalObject, PropertyNameArray& propertyNames, DontEnumPropertiesMode)
 {
     VM& vm = lexicalGlobalObject->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     RuntimeObject* thisObject = jsCast<RuntimeObject*>(object);
     if (!thisObject->m_instance) {
         throwRuntimeObjectInvalidAccessError(lexicalGlobalObject, scope);
         return;
     }

     RefPtr<Instance> instance = thisObject->m_instance;

     instance->begin();
     instance->getPropertyNames(lexicalGlobalObject, propertyNames);
     instance->end();
 }

 Exception* throwRuntimeObjectInvalidAccessError(JSGlobalObject* lexicalGlobalObject, ThrowScope& scope)
 {
     return throwException(lexicalGlobalObject, scope, createReferenceError(lexicalGlobalObject, "Trying to access object from destroyed plug-in."_s));
 }

 JSC::GCClient::IsoSubspace* RuntimeObject::subspaceForImpl(JSC::VM& vm)
 {
     return &static_cast<JSVMClientData*>(vm.clientData)->runtimeObjectSpace();
 }

 }
 }
	/*
	* Copyright (C) 2003-2022 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 "runtime_object.h"

	#include "JSDOMBinding.h"
	#include "WebCoreJSClientData.h"
	#include "runtime_method.h"
	#include <JavaScriptCore/Error.h>

	using namespace WebCore;

	namespace JSC {
	namespace Bindings {

	WEBCORE_EXPORT const ClassInfo RuntimeObject::s_info = { "RuntimeObject"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(RuntimeObject) };

	static JSC_DECLARE_HOST_FUNCTION(convertRuntimeObjectToPrimitive);
	static JSC_DECLARE_HOST_FUNCTION(callRuntimeObject);
	static JSC_DECLARE_HOST_FUNCTION(callRuntimeConstructor);

	static JSC_DECLARE_CUSTOM_GETTER(fallbackObjectGetter);
	static JSC_DECLARE_CUSTOM_GETTER(fieldGetter);
	static JSC_DECLARE_CUSTOM_GETTER(methodGetter);

	RuntimeObject::RuntimeObject(VM& vm, Structure* structure, RefPtr<Instance>&& instance)
	: Base(vm, structure)
	, m_instance(WTFMove(instance))
	{
	}

	void RuntimeObject::finishCreation(VM& vm)
	{
	Base::finishCreation(vm);
	ASSERT(inherits(info()));
	putDirect(vm, vm.propertyNames->toPrimitiveSymbol,
	JSFunction::create(vm, globalObject(), 1, "[Symbol.toPrimitive]"_s, convertRuntimeObjectToPrimitive),
	static_cast<unsigned>(PropertyAttribute::DontEnum));
	}

	void RuntimeObject::destroy(JSCell* cell)
	{
	static_cast<RuntimeObject*>(cell)->RuntimeObject::~RuntimeObject();
	}

	void RuntimeObject::invalidate()
	{
	ASSERT(m_instance);
	if (m_instance)
	m_instance->willInvalidateRuntimeObject();
	m_instance = nullptr;
	}

	JSC_DEFINE_CUSTOM_GETTER(fallbackObjectGetter, (JSGlobalObject* lexicalGlobalObject, EncodedJSValue thisValue, PropertyName propertyName))
	{
	VM& vm = lexicalGlobalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	RuntimeObject* thisObj = jsCast<RuntimeObject*>(JSValue::decode(thisValue));
	RefPtr<Instance> instance = thisObj->getInternalInstance();

	if (!instance)
	return JSValue::encode(throwRuntimeObjectInvalidAccessError(lexicalGlobalObject, scope));

	instance->begin();

	Class *aClass = instance->getClass();
	JSValue result = aClass->fallbackObject(lexicalGlobalObject, instance.get(), propertyName);

	instance->end();

	return JSValue::encode(result);
	}

	JSC_DEFINE_CUSTOM_GETTER(fieldGetter, (JSGlobalObject* lexicalGlobalObject, EncodedJSValue thisValue, PropertyName propertyName))
	{
	VM& vm = lexicalGlobalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	RuntimeObject* thisObj = jsCast<RuntimeObject*>(JSValue::decode(thisValue));
	RefPtr<Instance> instance = thisObj->getInternalInstance();

	if (!instance)
	return JSValue::encode(throwRuntimeObjectInvalidAccessError(lexicalGlobalObject, scope));

	instance->begin();

	Class *aClass = instance->getClass();
	Field* aField = aClass->fieldNamed(propertyName, instance.get());
	JSValue result = aField->valueFromInstance(lexicalGlobalObject, instance.get());

	instance->end();

	return JSValue::encode(result);
	}

	JSC_DEFINE_CUSTOM_GETTER(methodGetter, (JSGlobalObject* lexicalGlobalObject, EncodedJSValue thisValue, PropertyName propertyName))
	{
	VM& vm = lexicalGlobalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	RuntimeObject* thisObj = jsCast<RuntimeObject*>(JSValue::decode(thisValue));
	RefPtr<Instance> instance = thisObj->getInternalInstance();

	if (!instance)
	return JSValue::encode(throwRuntimeObjectInvalidAccessError(lexicalGlobalObject, scope));

	instance->begin();

	JSValue method = instance->getMethod(lexicalGlobalObject, propertyName);

	instance->end();

	return JSValue::encode(method);
	}

	bool RuntimeObject::getOwnPropertySlot(JSObject* object, JSGlobalObject* lexicalGlobalObject, PropertyName propertyName, PropertySlot& slot)
	{
	VM& vm = lexicalGlobalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	RuntimeObject* thisObject = jsCast<RuntimeObject*>(object);
	if (!thisObject->m_instance) {
	throwRuntimeObjectInvalidAccessError(lexicalGlobalObject, scope);
	return false;
	}

	if (propertyName.uid() == vm.propertyNames->toPrimitiveSymbol.impl())
	return JSObject::getOwnPropertySlot(thisObject, lexicalGlobalObject, propertyName, slot);

	RefPtr<Instance> instance = thisObject->m_instance;

	instance->begin();

	Class *aClass = instance->getClass();

	if (aClass) {
	// See if the instance has a field with the specified name.
	Field *aField = aClass->fieldNamed(propertyName, instance.get());
	if (aField) {
	slot.setCustom(thisObject, static_cast<unsigned>(JSC::PropertyAttribute::DontDelete), fieldGetter);
	instance->end();
	return true;
	} else {
	// Now check if a method with specified name exists, if so return a function object for
	// that method.
	if (aClass->methodNamed(propertyName, instance.get())) {
	slot.setCustom(thisObject, PropertyAttribute::DontDelete \| PropertyAttribute::ReadOnly, methodGetter);

	instance->end();
	return true;
	}
	}

	// Try a fallback object.
	if (!aClass->fallbackObject(lexicalGlobalObject, instance.get(), propertyName).isUndefined()) {
	slot.setCustom(thisObject, PropertyAttribute::DontDelete \| PropertyAttribute::ReadOnly \| PropertyAttribute::DontEnum, fallbackObjectGetter);
	instance->end();
	return true;
	}
	}

	instance->end();

	return instance->getOwnPropertySlot(thisObject, lexicalGlobalObject, propertyName, slot);
	}

	bool RuntimeObject::put(JSCell* cell, JSGlobalObject* lexicalGlobalObject, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
	{
	VM& vm = lexicalGlobalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	RuntimeObject* thisObject = jsCast<RuntimeObject*>(cell);
	if (!thisObject->m_instance) {
	throwRuntimeObjectInvalidAccessError(lexicalGlobalObject, scope);
	return false;
	}

	RefPtr<Instance> instance = thisObject->m_instance;
	instance->begin();

	// Set the value of the property.
	bool result = false;
	Field *aField = instance->getClass()->fieldNamed(propertyName, instance.get());
	if (aField)
	result = aField->setValueToInstance(lexicalGlobalObject, instance.get(), value);
	else if (!instance->setValueOfUndefinedField(lexicalGlobalObject, propertyName, value))
	result = instance->put(thisObject, lexicalGlobalObject, propertyName, value, slot);

	instance->end();
	return result;
	}

	bool RuntimeObject::deleteProperty(JSCell, JSGlobalObject, PropertyName, DeletePropertySlot&)
	{
	// Can never remove a property of a RuntimeObject.
	return false;
	}

	JSC_DEFINE_HOST_FUNCTION(convertRuntimeObjectToPrimitive, (JSGlobalObject* lexicalGlobalObject, CallFrame* callFrame))
	{
	VM& vm = lexicalGlobalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	auto* thisObject = jsDynamicCast<RuntimeObject*>(callFrame->thisValue());
	if (!thisObject)
	return throwVMTypeError(lexicalGlobalObject, scope, "RuntimeObject[Symbol.toPrimitive] method called on incompatible \|this\| value."_s);
	RefPtr instance = thisObject->getInternalInstance();
	if (!instance)
	return JSValue::encode(throwRuntimeObjectInvalidAccessError(lexicalGlobalObject, scope));
	auto hint = toPreferredPrimitiveType(lexicalGlobalObject, callFrame->argument(0));
	RETURN_IF_EXCEPTION(scope, { });

	instance->begin();
	JSValue result = instance->defaultValue(lexicalGlobalObject, hint);
	instance->end();
	return JSValue::encode(result);
	}

	JSC_DEFINE_HOST_FUNCTION(callRuntimeObject, (JSGlobalObject* globalObject, CallFrame* callFrame))
	{
	ASSERT_UNUSED(globalObject, callFrame->jsCallee()->inherits<RuntimeObject>());
	RefPtr<Instance> instance(static_cast<RuntimeObject*>(callFrame->jsCallee())->getInternalInstance());
	instance->begin();
	JSValue result = instance->invokeDefaultMethod(globalObject, callFrame);
	instance->end();
	return JSValue::encode(result);
	}

	CallData RuntimeObject::getCallData(JSCell* cell)
	{
	CallData callData;

	RuntimeObject* thisObject = jsCast<RuntimeObject*>(cell);
	if (thisObject->m_instance && thisObject->m_instance->supportsInvokeDefaultMethod()) {
	callData.type = CallData::Type::Native;
	callData.native.function = callRuntimeObject;
	}

	return callData;
	}

	JSC_DEFINE_HOST_FUNCTION(callRuntimeConstructor, (JSGlobalObject* globalObject, CallFrame* callFrame))
	{
	JSObject* constructor = callFrame->jsCallee();
	ASSERT_UNUSED(globalObject, constructor->inherits<RuntimeObject>());
	RefPtr<Instance> instance(static_cast<RuntimeObject*>(callFrame->jsCallee())->getInternalInstance());
	instance->begin();
	ArgList args(callFrame);
	JSValue result = instance->invokeConstruct(globalObject, callFrame, args);
	instance->end();

	ASSERT(result);
	return JSValue::encode(result.isObject() ? jsCast<JSObject*>(result.asCell()) : constructor);
	}

	CallData RuntimeObject::getConstructData(JSCell* cell)
	{
	CallData constructData;

	RuntimeObject* thisObject = jsCast<RuntimeObject*>(cell);
	if (thisObject->m_instance && thisObject->m_instance->supportsConstruct()) {
	constructData.type = CallData::Type::Native;
	constructData.native.function = callRuntimeConstructor;
	}

	return constructData;
	}

	void RuntimeObject::getOwnPropertyNames(JSObject* object, JSGlobalObject* lexicalGlobalObject, PropertyNameArray& propertyNames, DontEnumPropertiesMode)
	{
	VM& vm = lexicalGlobalObject->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	RuntimeObject* thisObject = jsCast<RuntimeObject*>(object);
	if (!thisObject->m_instance) {
	throwRuntimeObjectInvalidAccessError(lexicalGlobalObject, scope);
	return;
	}

	RefPtr<Instance> instance = thisObject->m_instance;

	instance->begin();
	instance->getPropertyNames(lexicalGlobalObject, propertyNames);
	instance->end();
	}

	Exception* throwRuntimeObjectInvalidAccessError(JSGlobalObject* lexicalGlobalObject, ThrowScope& scope)
	{
	return throwException(lexicalGlobalObject, scope, createReferenceError(lexicalGlobalObject, "Trying to access object from destroyed plug-in."_s));
	}

	JSC::GCClient::IsoSubspace* RuntimeObject::subspaceForImpl(JSC::VM& vm)
	{
	return &static_cast<JSVMClientData*>(vm.clientData)->runtimeObjectSpace();
	}

	}
	}