Source/JavaScriptCore/runtime/ReflectObject.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2015-2017 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 "ReflectObject.h"

 #include "BuiltinNames.h"
 #include "JSCInlines.h"
 #include "JSGlobalObjectFunctions.h"
 #include "Lookup.h"
 #include "ObjectConstructor.h"

 namespace JSC {

 static EncodedJSValue JSC_HOST_CALL reflectObjectConstruct(ExecState*);
 static EncodedJSValue JSC_HOST_CALL reflectObjectDefineProperty(ExecState*);
 static EncodedJSValue JSC_HOST_CALL reflectObjectGet(ExecState*);
 static EncodedJSValue JSC_HOST_CALL reflectObjectGetOwnPropertyDescriptor(ExecState*);
 static EncodedJSValue JSC_HOST_CALL reflectObjectGetPrototypeOf(ExecState*);
 static EncodedJSValue JSC_HOST_CALL reflectObjectIsExtensible(ExecState*);
 static EncodedJSValue JSC_HOST_CALL reflectObjectOwnKeys(ExecState*);
 static EncodedJSValue JSC_HOST_CALL reflectObjectPreventExtensions(ExecState*);
 static EncodedJSValue JSC_HOST_CALL reflectObjectSet(ExecState*);
 static EncodedJSValue JSC_HOST_CALL reflectObjectSetPrototypeOf(ExecState*);

 }

 #include "ReflectObject.lut.h"

 namespace JSC {

 STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(ReflectObject);

 const ClassInfo ReflectObject::s_info = { "Object", &Base::s_info, &reflectObjectTable, nullptr, CREATE_METHOD_TABLE(ReflectObject) };

 /* Source for ReflectObject.lut.h
 @begin reflectObjectTable
     apply                    JSBuiltin                             DontEnum|Function 3
     construct                reflectObjectConstruct                DontEnum|Function 2
     defineProperty           reflectObjectDefineProperty           DontEnum|Function 3
     deleteProperty           JSBuiltin                             DontEnum|Function 2
     get                      reflectObjectGet                      DontEnum|Function 2
     getOwnPropertyDescriptor reflectObjectGetOwnPropertyDescriptor DontEnum|Function 2
     getPrototypeOf           reflectObjectGetPrototypeOf           DontEnum|Function 1 ReflectGetPrototypeOfIntrinsic
     has                      JSBuiltin                             DontEnum|Function 2
     isExtensible             reflectObjectIsExtensible             DontEnum|Function 1
     ownKeys                  reflectObjectOwnKeys                  DontEnum|Function 1
     preventExtensions        reflectObjectPreventExtensions        DontEnum|Function 1
     set                      reflectObjectSet                      DontEnum|Function 3
     setPrototypeOf           reflectObjectSetPrototypeOf           DontEnum|Function 2
 @end
 */

 ReflectObject::ReflectObject(VM& vm, Structure* structure)
     : JSNonFinalObject(vm, structure)
 {
 }

 void ReflectObject::finishCreation(VM& vm, JSGlobalObject*)
 {
     Base::finishCreation(vm);
     ASSERT(inherits(vm, info()));
 }

 // ------------------------------ Functions --------------------------------

 // https://tc39.github.io/ecma262/#sec-reflect.construct
 EncodedJSValue JSC_HOST_CALL reflectObjectConstruct(ExecState* exec)
 {
     VM& vm = exec->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSValue target = exec->argument(0);
     if (!target.isObject())
         return JSValue::encode(throwTypeError(exec, scope, "Reflect.construct requires the first argument be a constructor"_s));

     ConstructData constructData;
     ConstructType constructType;
     if (!target.isConstructor(vm, constructType, constructData))
         return JSValue::encode(throwTypeError(exec, scope, "Reflect.construct requires the first argument be a constructor"_s));

     JSValue newTarget = target;
     if (exec->argumentCount() >= 3) {
         newTarget = exec->argument(2);
         if (!newTarget.isConstructor(vm))
             return JSValue::encode(throwTypeError(exec, scope, "Reflect.construct requires the third argument be a constructor if present"_s));
     }

     MarkedArgumentBuffer arguments;
     JSObject* argumentsObject = jsDynamicCast<JSObject*>(vm, exec->argument(1));
     if (!argumentsObject)
         return JSValue::encode(throwTypeError(exec, scope, "Reflect.construct requires the second argument be an object"_s));

     createListFromArrayLike(exec, argumentsObject, RuntimeTypeMaskAllTypes, "This error must not be raised"_s, [&] (JSValue value, RuntimeType) -> bool {
         arguments.append(value);
         return false;
     });
     RETURN_IF_EXCEPTION(scope, (arguments.overflowCheckNotNeeded(), encodedJSValue()));
     if (UNLIKELY(arguments.hasOverflowed())) {
         throwOutOfMemoryError(exec, scope);
         return encodedJSValue();
     }

     RELEASE_AND_RETURN(scope, JSValue::encode(construct(exec, target, constructType, constructData, arguments, newTarget)));
 }

 // https://tc39.github.io/ecma262/#sec-reflect.defineproperty
 EncodedJSValue JSC_HOST_CALL reflectObjectDefineProperty(ExecState* exec)
 {
     VM& vm = exec->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSValue target = exec->argument(0);
     if (!target.isObject())
         return JSValue::encode(throwTypeError(exec, scope, "Reflect.defineProperty requires the first argument be an object"_s));
     auto propertyName = exec->argument(1).toPropertyKey(exec);
     RETURN_IF_EXCEPTION(scope, encodedJSValue());

     PropertyDescriptor descriptor;
     bool success = toPropertyDescriptor(exec, exec->argument(2), descriptor);
     EXCEPTION_ASSERT(!scope.exception() == success);
     if (UNLIKELY(!success))
         return encodedJSValue();
     ASSERT((descriptor.attributes() & PropertyAttribute::Accessor) || (!descriptor.isAccessorDescriptor()));
     scope.assertNoException();

     // Reflect.defineProperty should not throw an error when the defineOwnProperty operation fails.
     bool shouldThrow = false;
     JSObject* targetObject = asObject(target);
     RELEASE_AND_RETURN(scope, JSValue::encode(jsBoolean(targetObject->methodTable(vm)->defineOwnProperty(targetObject, exec, propertyName, descriptor, shouldThrow))));
 }

 // https://tc39.github.io/ecma262/#sec-reflect.get
 EncodedJSValue JSC_HOST_CALL reflectObjectGet(ExecState* exec)
 {
     VM& vm = exec->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSValue target = exec->argument(0);
     if (!target.isObject())
         return JSValue::encode(throwTypeError(exec, scope, "Reflect.get requires the first argument be an object"_s));

     const Identifier propertyName = exec->argument(1).toPropertyKey(exec);
     RETURN_IF_EXCEPTION(scope, encodedJSValue());

     JSValue receiver = target;
     if (exec->argumentCount() >= 3)
         receiver = exec->argument(2);

     PropertySlot slot(receiver, PropertySlot::InternalMethodType::Get);
     RELEASE_AND_RETURN(scope, JSValue::encode(target.get(exec, propertyName, slot)));
 }

 // https://tc39.github.io/ecma262/#sec-reflect.getownpropertydescriptor
 EncodedJSValue JSC_HOST_CALL reflectObjectGetOwnPropertyDescriptor(ExecState* exec)
 {
     VM& vm = exec->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSValue target = exec->argument(0);
     if (!target.isObject())
         return JSValue::encode(throwTypeError(exec, scope, "Reflect.getOwnPropertyDescriptor requires the first argument be an object"_s));

     auto key = exec->argument(1).toPropertyKey(exec);
     RETURN_IF_EXCEPTION(scope, encodedJSValue());

     RELEASE_AND_RETURN(scope, JSValue::encode(objectConstructorGetOwnPropertyDescriptor(exec, asObject(target), key)));
 }

 // https://tc39.github.io/ecma262/#sec-reflect.getprototypeof
 EncodedJSValue JSC_HOST_CALL reflectObjectGetPrototypeOf(ExecState* exec)
 {
     VM& vm = exec->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSValue target = exec->argument(0);
     if (!target.isObject())
         return JSValue::encode(throwTypeError(exec, scope, "Reflect.getPrototypeOf requires the first argument be an object"_s));
     RELEASE_AND_RETURN(scope, JSValue::encode(asObject(target)->getPrototype(vm, exec)));
 }

 // https://tc39.github.io/ecma262/#sec-reflect.isextensible
 EncodedJSValue JSC_HOST_CALL reflectObjectIsExtensible(ExecState* exec)
 {
     VM& vm = exec->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSValue target = exec->argument(0);
     if (!target.isObject())
         return JSValue::encode(throwTypeError(exec, scope, "Reflect.isExtensible requires the first argument be an object"_s));

     bool isExtensible = asObject(target)->isExtensible(exec);
     RETURN_IF_EXCEPTION(scope, encodedJSValue());
     return JSValue::encode(jsBoolean(isExtensible));
 }

 // https://tc39.github.io/ecma262/#sec-reflect.ownkeys
 EncodedJSValue JSC_HOST_CALL reflectObjectOwnKeys(ExecState* exec)
 {
     VM& vm = exec->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSValue target = exec->argument(0);
     if (!target.isObject())
         return JSValue::encode(throwTypeError(exec, scope, "Reflect.ownKeys requires the first argument be an object"_s));
     RELEASE_AND_RETURN(scope, JSValue::encode(ownPropertyKeys(exec, jsCast<JSObject*>(target), PropertyNameMode::StringsAndSymbols, DontEnumPropertiesMode::Include)));
 }

 // https://tc39.github.io/ecma262/#sec-reflect.preventextensions
 EncodedJSValue JSC_HOST_CALL reflectObjectPreventExtensions(ExecState* exec)
 {
     VM& vm = exec->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSValue target = exec->argument(0);
     if (!target.isObject())
         return JSValue::encode(throwTypeError(exec, scope, "Reflect.preventExtensions requires the first argument be an object"_s));
     JSObject* object = asObject(target);
     bool result = object->methodTable(vm)->preventExtensions(object, exec);
     RETURN_IF_EXCEPTION(scope, encodedJSValue());
     return JSValue::encode(jsBoolean(result));
 }

 // https://tc39.github.io/ecma262/#sec-reflect.set
 EncodedJSValue JSC_HOST_CALL reflectObjectSet(ExecState* exec)
 {
     VM& vm = exec->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSValue target = exec->argument(0);
     if (!target.isObject())
         return JSValue::encode(throwTypeError(exec, scope, "Reflect.set requires the first argument be an object"_s));
     JSObject* targetObject = asObject(target);

     auto propertyName = exec->argument(1).toPropertyKey(exec);
     RETURN_IF_EXCEPTION(scope, encodedJSValue());

     JSValue receiver = target;
     if (exec->argumentCount() >= 4)
         receiver = exec->argument(3);

     // Do not raise any readonly errors that happen in strict mode.
     bool shouldThrowIfCantSet = false;
     PutPropertySlot slot(receiver, shouldThrowIfCantSet);
     RELEASE_AND_RETURN(scope, JSValue::encode(jsBoolean(targetObject->methodTable(vm)->put(targetObject, exec, propertyName, exec->argument(2), slot))));
 }

 // https://tc39.github.io/ecma262/#sec-reflect.setprototypeof
 EncodedJSValue JSC_HOST_CALL reflectObjectSetPrototypeOf(ExecState* exec)
 {
     VM& vm = exec->vm();
     auto scope = DECLARE_THROW_SCOPE(vm);

     JSValue target = exec->argument(0);
     if (!target.isObject())
         return JSValue::encode(throwTypeError(exec, scope, "Reflect.setPrototypeOf requires the first argument be an object"_s));
     JSValue proto = exec->argument(1);
     if (!proto.isObject() && !proto.isNull())
         return JSValue::encode(throwTypeError(exec, scope, "Reflect.setPrototypeOf requires the second argument be either an object or null"_s));

     JSObject* object = asObject(target);

     bool shouldThrowIfCantSet = false;
     bool didSetPrototype = object->setPrototype(vm, exec, proto, shouldThrowIfCantSet);
     RETURN_IF_EXCEPTION(scope, encodedJSValue());
     return JSValue::encode(jsBoolean(didSetPrototype));
 }

 } // namespace JSC
	/*
	* Copyright (C) 2015-2017 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 "ReflectObject.h"

	#include "BuiltinNames.h"
	#include "JSCInlines.h"
	#include "JSGlobalObjectFunctions.h"
	#include "Lookup.h"
	#include "ObjectConstructor.h"

	namespace JSC {

	static EncodedJSValue JSC_HOST_CALL reflectObjectConstruct(ExecState*);
	static EncodedJSValue JSC_HOST_CALL reflectObjectDefineProperty(ExecState*);
	static EncodedJSValue JSC_HOST_CALL reflectObjectGet(ExecState*);
	static EncodedJSValue JSC_HOST_CALL reflectObjectGetOwnPropertyDescriptor(ExecState*);
	static EncodedJSValue JSC_HOST_CALL reflectObjectGetPrototypeOf(ExecState*);
	static EncodedJSValue JSC_HOST_CALL reflectObjectIsExtensible(ExecState*);
	static EncodedJSValue JSC_HOST_CALL reflectObjectOwnKeys(ExecState*);
	static EncodedJSValue JSC_HOST_CALL reflectObjectPreventExtensions(ExecState*);
	static EncodedJSValue JSC_HOST_CALL reflectObjectSet(ExecState*);
	static EncodedJSValue JSC_HOST_CALL reflectObjectSetPrototypeOf(ExecState*);

	}

	#include "ReflectObject.lut.h"

	namespace JSC {

	STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(ReflectObject);

	const ClassInfo ReflectObject::s_info = { "Object", &Base::s_info, &reflectObjectTable, nullptr, CREATE_METHOD_TABLE(ReflectObject) };

	/* Source for ReflectObject.lut.h
	@begin reflectObjectTable
	apply JSBuiltin DontEnum\|Function 3
	construct reflectObjectConstruct DontEnum\|Function 2
	defineProperty reflectObjectDefineProperty DontEnum\|Function 3
	deleteProperty JSBuiltin DontEnum\|Function 2
	get reflectObjectGet DontEnum\|Function 2
	getOwnPropertyDescriptor reflectObjectGetOwnPropertyDescriptor DontEnum\|Function 2
	getPrototypeOf reflectObjectGetPrototypeOf DontEnum\|Function 1 ReflectGetPrototypeOfIntrinsic
	has JSBuiltin DontEnum\|Function 2
	isExtensible reflectObjectIsExtensible DontEnum\|Function 1
	ownKeys reflectObjectOwnKeys DontEnum\|Function 1
	preventExtensions reflectObjectPreventExtensions DontEnum\|Function 1
	set reflectObjectSet DontEnum\|Function 3
	setPrototypeOf reflectObjectSetPrototypeOf DontEnum\|Function 2
	@end
	*/

	ReflectObject::ReflectObject(VM& vm, Structure* structure)
	: JSNonFinalObject(vm, structure)
	{
	}

	void ReflectObject::finishCreation(VM& vm, JSGlobalObject*)
	{
	Base::finishCreation(vm);
	ASSERT(inherits(vm, info()));
	}

	// ------------------------------ Functions --------------------------------

	// https://tc39.github.io/ecma262/#sec-reflect.construct
	EncodedJSValue JSC_HOST_CALL reflectObjectConstruct(ExecState* exec)
	{
	VM& vm = exec->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSValue target = exec->argument(0);
	if (!target.isObject())
	return JSValue::encode(throwTypeError(exec, scope, "Reflect.construct requires the first argument be a constructor"_s));

	ConstructData constructData;
	ConstructType constructType;
	if (!target.isConstructor(vm, constructType, constructData))
	return JSValue::encode(throwTypeError(exec, scope, "Reflect.construct requires the first argument be a constructor"_s));

	JSValue newTarget = target;
	if (exec->argumentCount() >= 3) {
	newTarget = exec->argument(2);
	if (!newTarget.isConstructor(vm))
	return JSValue::encode(throwTypeError(exec, scope, "Reflect.construct requires the third argument be a constructor if present"_s));
	}

	MarkedArgumentBuffer arguments;
	JSObject* argumentsObject = jsDynamicCast<JSObject*>(vm, exec->argument(1));
	if (!argumentsObject)
	return JSValue::encode(throwTypeError(exec, scope, "Reflect.construct requires the second argument be an object"_s));

	createListFromArrayLike(exec, argumentsObject, RuntimeTypeMaskAllTypes, "This error must not be raised"_s, [&] (JSValue value, RuntimeType) -> bool {
	arguments.append(value);
	return false;
	});
	RETURN_IF_EXCEPTION(scope, (arguments.overflowCheckNotNeeded(), encodedJSValue()));
	if (UNLIKELY(arguments.hasOverflowed())) {
	throwOutOfMemoryError(exec, scope);
	return encodedJSValue();
	}

	RELEASE_AND_RETURN(scope, JSValue::encode(construct(exec, target, constructType, constructData, arguments, newTarget)));
	}

	// https://tc39.github.io/ecma262/#sec-reflect.defineproperty
	EncodedJSValue JSC_HOST_CALL reflectObjectDefineProperty(ExecState* exec)
	{
	VM& vm = exec->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSValue target = exec->argument(0);
	if (!target.isObject())
	return JSValue::encode(throwTypeError(exec, scope, "Reflect.defineProperty requires the first argument be an object"_s));
	auto propertyName = exec->argument(1).toPropertyKey(exec);
	RETURN_IF_EXCEPTION(scope, encodedJSValue());

	PropertyDescriptor descriptor;
	bool success = toPropertyDescriptor(exec, exec->argument(2), descriptor);
	EXCEPTION_ASSERT(!scope.exception() == success);
	if (UNLIKELY(!success))
	return encodedJSValue();
	ASSERT((descriptor.attributes() & PropertyAttribute::Accessor) \|\| (!descriptor.isAccessorDescriptor()));
	scope.assertNoException();

	// Reflect.defineProperty should not throw an error when the defineOwnProperty operation fails.
	bool shouldThrow = false;
	JSObject* targetObject = asObject(target);
	RELEASE_AND_RETURN(scope, JSValue::encode(jsBoolean(targetObject->methodTable(vm)->defineOwnProperty(targetObject, exec, propertyName, descriptor, shouldThrow))));
	}

	// https://tc39.github.io/ecma262/#sec-reflect.get
	EncodedJSValue JSC_HOST_CALL reflectObjectGet(ExecState* exec)
	{
	VM& vm = exec->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSValue target = exec->argument(0);
	if (!target.isObject())
	return JSValue::encode(throwTypeError(exec, scope, "Reflect.get requires the first argument be an object"_s));

	const Identifier propertyName = exec->argument(1).toPropertyKey(exec);
	RETURN_IF_EXCEPTION(scope, encodedJSValue());

	JSValue receiver = target;
	if (exec->argumentCount() >= 3)
	receiver = exec->argument(2);

	PropertySlot slot(receiver, PropertySlot::InternalMethodType::Get);
	RELEASE_AND_RETURN(scope, JSValue::encode(target.get(exec, propertyName, slot)));
	}

	// https://tc39.github.io/ecma262/#sec-reflect.getownpropertydescriptor
	EncodedJSValue JSC_HOST_CALL reflectObjectGetOwnPropertyDescriptor(ExecState* exec)
	{
	VM& vm = exec->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSValue target = exec->argument(0);
	if (!target.isObject())
	return JSValue::encode(throwTypeError(exec, scope, "Reflect.getOwnPropertyDescriptor requires the first argument be an object"_s));

	auto key = exec->argument(1).toPropertyKey(exec);
	RETURN_IF_EXCEPTION(scope, encodedJSValue());

	RELEASE_AND_RETURN(scope, JSValue::encode(objectConstructorGetOwnPropertyDescriptor(exec, asObject(target), key)));
	}

	// https://tc39.github.io/ecma262/#sec-reflect.getprototypeof
	EncodedJSValue JSC_HOST_CALL reflectObjectGetPrototypeOf(ExecState* exec)
	{
	VM& vm = exec->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSValue target = exec->argument(0);
	if (!target.isObject())
	return JSValue::encode(throwTypeError(exec, scope, "Reflect.getPrototypeOf requires the first argument be an object"_s));
	RELEASE_AND_RETURN(scope, JSValue::encode(asObject(target)->getPrototype(vm, exec)));
	}

	// https://tc39.github.io/ecma262/#sec-reflect.isextensible
	EncodedJSValue JSC_HOST_CALL reflectObjectIsExtensible(ExecState* exec)
	{
	VM& vm = exec->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSValue target = exec->argument(0);
	if (!target.isObject())
	return JSValue::encode(throwTypeError(exec, scope, "Reflect.isExtensible requires the first argument be an object"_s));

	bool isExtensible = asObject(target)->isExtensible(exec);
	RETURN_IF_EXCEPTION(scope, encodedJSValue());
	return JSValue::encode(jsBoolean(isExtensible));
	}

	// https://tc39.github.io/ecma262/#sec-reflect.ownkeys
	EncodedJSValue JSC_HOST_CALL reflectObjectOwnKeys(ExecState* exec)
	{
	VM& vm = exec->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSValue target = exec->argument(0);
	if (!target.isObject())
	return JSValue::encode(throwTypeError(exec, scope, "Reflect.ownKeys requires the first argument be an object"_s));
	RELEASE_AND_RETURN(scope, JSValue::encode(ownPropertyKeys(exec, jsCast<JSObject*>(target), PropertyNameMode::StringsAndSymbols, DontEnumPropertiesMode::Include)));
	}

	// https://tc39.github.io/ecma262/#sec-reflect.preventextensions
	EncodedJSValue JSC_HOST_CALL reflectObjectPreventExtensions(ExecState* exec)
	{
	VM& vm = exec->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSValue target = exec->argument(0);
	if (!target.isObject())
	return JSValue::encode(throwTypeError(exec, scope, "Reflect.preventExtensions requires the first argument be an object"_s));
	JSObject* object = asObject(target);
	bool result = object->methodTable(vm)->preventExtensions(object, exec);
	RETURN_IF_EXCEPTION(scope, encodedJSValue());
	return JSValue::encode(jsBoolean(result));
	}

	// https://tc39.github.io/ecma262/#sec-reflect.set
	EncodedJSValue JSC_HOST_CALL reflectObjectSet(ExecState* exec)
	{
	VM& vm = exec->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSValue target = exec->argument(0);
	if (!target.isObject())
	return JSValue::encode(throwTypeError(exec, scope, "Reflect.set requires the first argument be an object"_s));
	JSObject* targetObject = asObject(target);

	auto propertyName = exec->argument(1).toPropertyKey(exec);
	RETURN_IF_EXCEPTION(scope, encodedJSValue());

	JSValue receiver = target;
	if (exec->argumentCount() >= 4)
	receiver = exec->argument(3);

	// Do not raise any readonly errors that happen in strict mode.
	bool shouldThrowIfCantSet = false;
	PutPropertySlot slot(receiver, shouldThrowIfCantSet);
	RELEASE_AND_RETURN(scope, JSValue::encode(jsBoolean(targetObject->methodTable(vm)->put(targetObject, exec, propertyName, exec->argument(2), slot))));
	}

	// https://tc39.github.io/ecma262/#sec-reflect.setprototypeof
	EncodedJSValue JSC_HOST_CALL reflectObjectSetPrototypeOf(ExecState* exec)
	{
	VM& vm = exec->vm();
	auto scope = DECLARE_THROW_SCOPE(vm);

	JSValue target = exec->argument(0);
	if (!target.isObject())
	return JSValue::encode(throwTypeError(exec, scope, "Reflect.setPrototypeOf requires the first argument be an object"_s));
	JSValue proto = exec->argument(1);
	if (!proto.isObject() && !proto.isNull())
	return JSValue::encode(throwTypeError(exec, scope, "Reflect.setPrototypeOf requires the second argument be either an object or null"_s));

	JSObject* object = asObject(target);

	bool shouldThrowIfCantSet = false;
	bool didSetPrototype = object->setPrototype(vm, exec, proto, shouldThrowIfCantSet);
	RETURN_IF_EXCEPTION(scope, encodedJSValue());
	return JSValue::encode(jsBoolean(didSetPrototype));
	}

	} // namespace JSC