| /* |
| * Copyright (C) 1999-2000 Harri Porten (porten@kde.org) |
| * Copyright (C) 2008 Apple Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| * |
| */ |
| |
| #include "config.h" |
| #include "ObjectConstructor.h" |
| |
| #include "ButterflyInlines.h" |
| #include "CopiedSpaceInlines.h" |
| #include "Error.h" |
| #include "ExceptionHelpers.h" |
| #include "JSFunction.h" |
| #include "JSArray.h" |
| #include "JSGlobalObject.h" |
| #include "Lookup.h" |
| #include "ObjectPrototype.h" |
| #include "PropertyDescriptor.h" |
| #include "PropertyNameArray.h" |
| |
| namespace JSC { |
| |
| static EncodedJSValue JSC_HOST_CALL objectConstructorGetPrototypeOf(ExecState*); |
| static EncodedJSValue JSC_HOST_CALL objectConstructorGetOwnPropertyDescriptor(ExecState*); |
| static EncodedJSValue JSC_HOST_CALL objectConstructorGetOwnPropertyNames(ExecState*); |
| static EncodedJSValue JSC_HOST_CALL objectConstructorKeys(ExecState*); |
| static EncodedJSValue JSC_HOST_CALL objectConstructorDefineProperty(ExecState*); |
| static EncodedJSValue JSC_HOST_CALL objectConstructorDefineProperties(ExecState*); |
| static EncodedJSValue JSC_HOST_CALL objectConstructorCreate(ExecState*); |
| static EncodedJSValue JSC_HOST_CALL objectConstructorSeal(ExecState*); |
| static EncodedJSValue JSC_HOST_CALL objectConstructorFreeze(ExecState*); |
| static EncodedJSValue JSC_HOST_CALL objectConstructorPreventExtensions(ExecState*); |
| static EncodedJSValue JSC_HOST_CALL objectConstructorIsSealed(ExecState*); |
| static EncodedJSValue JSC_HOST_CALL objectConstructorIsFrozen(ExecState*); |
| static EncodedJSValue JSC_HOST_CALL objectConstructorIsExtensible(ExecState*); |
| |
| } |
| |
| #include "ObjectConstructor.lut.h" |
| |
| namespace JSC { |
| |
| ASSERT_HAS_TRIVIAL_DESTRUCTOR(ObjectConstructor); |
| |
| const ClassInfo ObjectConstructor::s_info = { "Function", InternalFunction::s_classinfo(), 0, ExecState::objectConstructorTable, CREATE_METHOD_TABLE(ObjectConstructor) }; |
| |
| /* Source for ObjectConstructor.lut.h |
| @begin objectConstructorTable |
| getPrototypeOf objectConstructorGetPrototypeOf DontEnum|Function 1 |
| getOwnPropertyDescriptor objectConstructorGetOwnPropertyDescriptor DontEnum|Function 2 |
| getOwnPropertyNames objectConstructorGetOwnPropertyNames DontEnum|Function 1 |
| keys objectConstructorKeys DontEnum|Function 1 |
| defineProperty objectConstructorDefineProperty DontEnum|Function 3 |
| defineProperties objectConstructorDefineProperties DontEnum|Function 2 |
| create objectConstructorCreate DontEnum|Function 2 |
| seal objectConstructorSeal DontEnum|Function 1 |
| freeze objectConstructorFreeze DontEnum|Function 1 |
| preventExtensions objectConstructorPreventExtensions DontEnum|Function 1 |
| isSealed objectConstructorIsSealed DontEnum|Function 1 |
| isFrozen objectConstructorIsFrozen DontEnum|Function 1 |
| isExtensible objectConstructorIsExtensible DontEnum|Function 1 |
| @end |
| */ |
| |
| ObjectConstructor::ObjectConstructor(JSGlobalObject* globalObject, Structure* structure) |
| : InternalFunction(globalObject, structure) |
| { |
| } |
| |
| void ObjectConstructor::finishCreation(ExecState* exec, ObjectPrototype* objectPrototype) |
| { |
| Base::finishCreation(exec->globalData(), Identifier(exec, "Object").string()); |
| // ECMA 15.2.3.1 |
| putDirectWithoutTransition(exec->globalData(), exec->propertyNames().prototype, objectPrototype, DontEnum | DontDelete | ReadOnly); |
| // no. of arguments for constructor |
| putDirectWithoutTransition(exec->globalData(), exec->propertyNames().length, jsNumber(1), ReadOnly | DontEnum | DontDelete); |
| } |
| |
| bool ObjectConstructor::getOwnPropertySlot(JSCell* cell, ExecState* exec, PropertyName propertyName, PropertySlot &slot) |
| { |
| return getStaticFunctionSlot<JSObject>(exec, ExecState::objectConstructorTable(exec), jsCast<ObjectConstructor*>(cell), propertyName, slot); |
| } |
| |
| bool ObjectConstructor::getOwnPropertyDescriptor(JSObject* object, ExecState* exec, PropertyName propertyName, PropertyDescriptor& descriptor) |
| { |
| return getStaticFunctionDescriptor<JSObject>(exec, ExecState::objectConstructorTable(exec), jsCast<ObjectConstructor*>(object), propertyName, descriptor); |
| } |
| |
| // ECMA 15.2.2 |
| static ALWAYS_INLINE JSObject* constructObject(ExecState* exec, JSGlobalObject* globalObject, const ArgList& args) |
| { |
| JSValue arg = args.at(0); |
| if (arg.isUndefinedOrNull()) |
| return constructEmptyObject(exec, globalObject); |
| return arg.toObject(exec, globalObject); |
| } |
| |
| static EncodedJSValue JSC_HOST_CALL constructWithObjectConstructor(ExecState* exec) |
| { |
| ArgList args(exec); |
| return JSValue::encode(constructObject(exec, asInternalFunction(exec->callee())->globalObject(), args)); |
| } |
| |
| ConstructType ObjectConstructor::getConstructData(JSCell*, ConstructData& constructData) |
| { |
| constructData.native.function = constructWithObjectConstructor; |
| return ConstructTypeHost; |
| } |
| |
| static EncodedJSValue JSC_HOST_CALL callObjectConstructor(ExecState* exec) |
| { |
| ArgList args(exec); |
| return JSValue::encode(constructObject(exec, asInternalFunction(exec->callee())->globalObject(), args)); |
| } |
| |
| CallType ObjectConstructor::getCallData(JSCell*, CallData& callData) |
| { |
| callData.native.function = callObjectConstructor; |
| return CallTypeHost; |
| } |
| |
| EncodedJSValue JSC_HOST_CALL objectConstructorGetPrototypeOf(ExecState* exec) |
| { |
| if (!exec->argument(0).isObject()) |
| return throwVMError(exec, createTypeError(exec, ASCIILiteral("Requested prototype of a value that is not an object."))); |
| JSObject* object = asObject(exec->argument(0)); |
| if (!object->allowsAccessFrom(exec->trueCallerFrame())) |
| return JSValue::encode(jsUndefined()); |
| return JSValue::encode(object->prototype()); |
| } |
| |
| EncodedJSValue JSC_HOST_CALL objectConstructorGetOwnPropertyDescriptor(ExecState* exec) |
| { |
| if (!exec->argument(0).isObject()) |
| return throwVMError(exec, createTypeError(exec, ASCIILiteral("Requested property descriptor of a value that is not an object."))); |
| String propertyName = exec->argument(1).toString(exec)->value(exec); |
| if (exec->hadException()) |
| return JSValue::encode(jsNull()); |
| JSObject* object = asObject(exec->argument(0)); |
| PropertyDescriptor descriptor; |
| if (!object->methodTable()->getOwnPropertyDescriptor(object, exec, Identifier(exec, propertyName), descriptor)) |
| return JSValue::encode(jsUndefined()); |
| if (exec->hadException()) |
| return JSValue::encode(jsUndefined()); |
| |
| JSObject* description = constructEmptyObject(exec); |
| if (!descriptor.isAccessorDescriptor()) { |
| description->putDirect(exec->globalData(), exec->propertyNames().value, descriptor.value() ? descriptor.value() : jsUndefined(), 0); |
| description->putDirect(exec->globalData(), exec->propertyNames().writable, jsBoolean(descriptor.writable()), 0); |
| } else { |
| ASSERT(descriptor.getter()); |
| ASSERT(descriptor.setter()); |
| description->putDirect(exec->globalData(), exec->propertyNames().get, descriptor.getter(), 0); |
| description->putDirect(exec->globalData(), exec->propertyNames().set, descriptor.setter(), 0); |
| } |
| |
| description->putDirect(exec->globalData(), exec->propertyNames().enumerable, jsBoolean(descriptor.enumerable()), 0); |
| description->putDirect(exec->globalData(), exec->propertyNames().configurable, jsBoolean(descriptor.configurable()), 0); |
| |
| return JSValue::encode(description); |
| } |
| |
| // FIXME: Use the enumeration cache. |
| EncodedJSValue JSC_HOST_CALL objectConstructorGetOwnPropertyNames(ExecState* exec) |
| { |
| if (!exec->argument(0).isObject()) |
| return throwVMError(exec, createTypeError(exec, ASCIILiteral("Requested property names of a value that is not an object."))); |
| PropertyNameArray properties(exec); |
| asObject(exec->argument(0))->methodTable()->getOwnPropertyNames(asObject(exec->argument(0)), exec, properties, IncludeDontEnumProperties); |
| JSArray* names = constructEmptyArray(exec, 0); |
| size_t numProperties = properties.size(); |
| for (size_t i = 0; i < numProperties; i++) |
| names->push(exec, jsOwnedString(exec, properties[i].string())); |
| return JSValue::encode(names); |
| } |
| |
| // FIXME: Use the enumeration cache. |
| EncodedJSValue JSC_HOST_CALL objectConstructorKeys(ExecState* exec) |
| { |
| if (!exec->argument(0).isObject()) |
| return throwVMError(exec, createTypeError(exec, ASCIILiteral("Requested keys of a value that is not an object."))); |
| PropertyNameArray properties(exec); |
| asObject(exec->argument(0))->methodTable()->getOwnPropertyNames(asObject(exec->argument(0)), exec, properties, ExcludeDontEnumProperties); |
| JSArray* keys = constructEmptyArray(exec, 0); |
| size_t numProperties = properties.size(); |
| for (size_t i = 0; i < numProperties; i++) |
| keys->push(exec, jsOwnedString(exec, properties[i].string())); |
| return JSValue::encode(keys); |
| } |
| |
| // ES5 8.10.5 ToPropertyDescriptor |
| static bool toPropertyDescriptor(ExecState* exec, JSValue in, PropertyDescriptor& desc) |
| { |
| if (!in.isObject()) { |
| throwError(exec, createTypeError(exec, ASCIILiteral("Property description must be an object."))); |
| return false; |
| } |
| JSObject* description = asObject(in); |
| |
| PropertySlot enumerableSlot(description); |
| if (description->getPropertySlot(exec, exec->propertyNames().enumerable, enumerableSlot)) { |
| desc.setEnumerable(enumerableSlot.getValue(exec, exec->propertyNames().enumerable).toBoolean(exec)); |
| if (exec->hadException()) |
| return false; |
| } |
| |
| PropertySlot configurableSlot(description); |
| if (description->getPropertySlot(exec, exec->propertyNames().configurable, configurableSlot)) { |
| desc.setConfigurable(configurableSlot.getValue(exec, exec->propertyNames().configurable).toBoolean(exec)); |
| if (exec->hadException()) |
| return false; |
| } |
| |
| JSValue value; |
| PropertySlot valueSlot(description); |
| if (description->getPropertySlot(exec, exec->propertyNames().value, valueSlot)) { |
| desc.setValue(valueSlot.getValue(exec, exec->propertyNames().value)); |
| if (exec->hadException()) |
| return false; |
| } |
| |
| PropertySlot writableSlot(description); |
| if (description->getPropertySlot(exec, exec->propertyNames().writable, writableSlot)) { |
| desc.setWritable(writableSlot.getValue(exec, exec->propertyNames().writable).toBoolean(exec)); |
| if (exec->hadException()) |
| return false; |
| } |
| |
| PropertySlot getSlot(description); |
| if (description->getPropertySlot(exec, exec->propertyNames().get, getSlot)) { |
| JSValue get = getSlot.getValue(exec, exec->propertyNames().get); |
| if (exec->hadException()) |
| return false; |
| if (!get.isUndefined()) { |
| CallData callData; |
| if (getCallData(get, callData) == CallTypeNone) { |
| throwError(exec, createTypeError(exec, ASCIILiteral("Getter must be a function."))); |
| return false; |
| } |
| } |
| desc.setGetter(get); |
| } |
| |
| PropertySlot setSlot(description); |
| if (description->getPropertySlot(exec, exec->propertyNames().set, setSlot)) { |
| JSValue set = setSlot.getValue(exec, exec->propertyNames().set); |
| if (exec->hadException()) |
| return false; |
| if (!set.isUndefined()) { |
| CallData callData; |
| if (getCallData(set, callData) == CallTypeNone) { |
| throwError(exec, createTypeError(exec, ASCIILiteral("Setter must be a function."))); |
| return false; |
| } |
| } |
| desc.setSetter(set); |
| } |
| |
| if (!desc.isAccessorDescriptor()) |
| return true; |
| |
| if (desc.value()) { |
| throwError(exec, createTypeError(exec, ASCIILiteral("Invalid property. 'value' present on property with getter or setter."))); |
| return false; |
| } |
| |
| if (desc.writablePresent()) { |
| throwError(exec, createTypeError(exec, ASCIILiteral("Invalid property. 'writable' present on property with getter or setter."))); |
| return false; |
| } |
| return true; |
| } |
| |
| EncodedJSValue JSC_HOST_CALL objectConstructorDefineProperty(ExecState* exec) |
| { |
| if (!exec->argument(0).isObject()) |
| return throwVMError(exec, createTypeError(exec, ASCIILiteral("Properties can only be defined on Objects."))); |
| JSObject* O = asObject(exec->argument(0)); |
| String propertyName = exec->argument(1).toString(exec)->value(exec); |
| if (exec->hadException()) |
| return JSValue::encode(jsNull()); |
| PropertyDescriptor descriptor; |
| if (!toPropertyDescriptor(exec, exec->argument(2), descriptor)) |
| return JSValue::encode(jsNull()); |
| ASSERT((descriptor.attributes() & Accessor) || (!descriptor.isAccessorDescriptor())); |
| ASSERT(!exec->hadException()); |
| O->methodTable()->defineOwnProperty(O, exec, Identifier(exec, propertyName), descriptor, true); |
| return JSValue::encode(O); |
| } |
| |
| static JSValue defineProperties(ExecState* exec, JSObject* object, JSObject* properties) |
| { |
| PropertyNameArray propertyNames(exec); |
| asObject(properties)->methodTable()->getOwnPropertyNames(asObject(properties), exec, propertyNames, ExcludeDontEnumProperties); |
| size_t numProperties = propertyNames.size(); |
| Vector<PropertyDescriptor> descriptors; |
| MarkedArgumentBuffer markBuffer; |
| for (size_t i = 0; i < numProperties; i++) { |
| PropertySlot slot; |
| JSValue prop = properties->get(exec, propertyNames[i]); |
| if (exec->hadException()) |
| return jsNull(); |
| PropertyDescriptor descriptor; |
| if (!toPropertyDescriptor(exec, prop, descriptor)) |
| return jsNull(); |
| descriptors.append(descriptor); |
| // Ensure we mark all the values that we're accumulating |
| if (descriptor.isDataDescriptor() && descriptor.value()) |
| markBuffer.append(descriptor.value()); |
| if (descriptor.isAccessorDescriptor()) { |
| if (descriptor.getter()) |
| markBuffer.append(descriptor.getter()); |
| if (descriptor.setter()) |
| markBuffer.append(descriptor.setter()); |
| } |
| } |
| for (size_t i = 0; i < numProperties; i++) { |
| object->methodTable()->defineOwnProperty(object, exec, propertyNames[i], descriptors[i], true); |
| if (exec->hadException()) |
| return jsNull(); |
| } |
| return object; |
| } |
| |
| EncodedJSValue JSC_HOST_CALL objectConstructorDefineProperties(ExecState* exec) |
| { |
| if (!exec->argument(0).isObject()) |
| return throwVMError(exec, createTypeError(exec, ASCIILiteral("Properties can only be defined on Objects."))); |
| return JSValue::encode(defineProperties(exec, asObject(exec->argument(0)), exec->argument(1).toObject(exec))); |
| } |
| |
| EncodedJSValue JSC_HOST_CALL objectConstructorCreate(ExecState* exec) |
| { |
| if (!exec->argument(0).isObject() && !exec->argument(0).isNull()) |
| return throwVMError(exec, createTypeError(exec, ASCIILiteral("Object prototype may only be an Object or null."))); |
| JSValue proto = exec->argument(0); |
| JSObject* newObject = proto.isObject() ? constructEmptyObject(exec, asObject(proto)->inheritorID(exec->globalData())) : constructEmptyObject(exec, exec->lexicalGlobalObject()->nullPrototypeObjectStructure()); |
| if (exec->argument(1).isUndefined()) |
| return JSValue::encode(newObject); |
| if (!exec->argument(1).isObject()) |
| return throwVMError(exec, createTypeError(exec, ASCIILiteral("Property descriptor list must be an Object."))); |
| return JSValue::encode(defineProperties(exec, newObject, asObject(exec->argument(1)))); |
| } |
| |
| EncodedJSValue JSC_HOST_CALL objectConstructorSeal(ExecState* exec) |
| { |
| // 1. If Type(O) is not Object throw a TypeError exception. |
| JSValue obj = exec->argument(0); |
| if (!obj.isObject()) |
| return throwVMError(exec, createTypeError(exec, ASCIILiteral("Object.seal can only be called on Objects."))); |
| JSObject* object = asObject(obj); |
| |
| if (isJSFinalObject(object)) { |
| object->seal(exec->globalData()); |
| return JSValue::encode(obj); |
| } |
| |
| // 2. For each named own property name P of O, |
| PropertyNameArray properties(exec); |
| object->methodTable()->getOwnPropertyNames(object, exec, properties, IncludeDontEnumProperties); |
| PropertyNameArray::const_iterator end = properties.end(); |
| for (PropertyNameArray::const_iterator iter = properties.begin(); iter != end; ++iter) { |
| // a. Let desc be the result of calling the [[GetOwnProperty]] internal method of O with P. |
| PropertyDescriptor desc; |
| if (!object->methodTable()->getOwnPropertyDescriptor(object, exec, *iter, desc)) |
| continue; |
| // b. If desc.[[Configurable]] is true, set desc.[[Configurable]] to false. |
| desc.setConfigurable(false); |
| // c. Call the [[DefineOwnProperty]] internal method of O with P, desc, and true as arguments. |
| object->methodTable()->defineOwnProperty(object, exec, *iter, desc, true); |
| if (exec->hadException()) |
| return JSValue::encode(obj); |
| } |
| |
| // 3. Set the [[Extensible]] internal property of O to false. |
| object->preventExtensions(exec->globalData()); |
| |
| // 4. Return O. |
| return JSValue::encode(obj); |
| } |
| |
| EncodedJSValue JSC_HOST_CALL objectConstructorFreeze(ExecState* exec) |
| { |
| // 1. If Type(O) is not Object throw a TypeError exception. |
| JSValue obj = exec->argument(0); |
| if (!obj.isObject()) |
| return throwVMError(exec, createTypeError(exec, ASCIILiteral("Object.freeze can only be called on Objects."))); |
| JSObject* object = asObject(obj); |
| |
| if (isJSFinalObject(object) && !hasIndexedProperties(object->structure()->indexingType())) { |
| object->freeze(exec->globalData()); |
| return JSValue::encode(obj); |
| } |
| |
| // 2. For each named own property name P of O, |
| PropertyNameArray properties(exec); |
| object->methodTable()->getOwnPropertyNames(object, exec, properties, IncludeDontEnumProperties); |
| PropertyNameArray::const_iterator end = properties.end(); |
| for (PropertyNameArray::const_iterator iter = properties.begin(); iter != end; ++iter) { |
| // a. Let desc be the result of calling the [[GetOwnProperty]] internal method of O with P. |
| PropertyDescriptor desc; |
| if (!object->methodTable()->getOwnPropertyDescriptor(object, exec, *iter, desc)) |
| continue; |
| // b. If IsDataDescriptor(desc) is true, then |
| // i. If desc.[[Writable]] is true, set desc.[[Writable]] to false. |
| if (desc.isDataDescriptor()) |
| desc.setWritable(false); |
| // c. If desc.[[Configurable]] is true, set desc.[[Configurable]] to false. |
| desc.setConfigurable(false); |
| // d. Call the [[DefineOwnProperty]] internal method of O with P, desc, and true as arguments. |
| object->methodTable()->defineOwnProperty(object, exec, *iter, desc, true); |
| if (exec->hadException()) |
| return JSValue::encode(obj); |
| } |
| |
| // 3. Set the [[Extensible]] internal property of O to false. |
| object->preventExtensions(exec->globalData()); |
| |
| // 4. Return O. |
| return JSValue::encode(obj); |
| } |
| |
| EncodedJSValue JSC_HOST_CALL objectConstructorPreventExtensions(ExecState* exec) |
| { |
| JSValue obj = exec->argument(0); |
| if (!obj.isObject()) |
| return throwVMError(exec, createTypeError(exec, ASCIILiteral("Object.preventExtensions can only be called on Objects."))); |
| asObject(obj)->preventExtensions(exec->globalData()); |
| return JSValue::encode(obj); |
| } |
| |
| EncodedJSValue JSC_HOST_CALL objectConstructorIsSealed(ExecState* exec) |
| { |
| // 1. If Type(O) is not Object throw a TypeError exception. |
| JSValue obj = exec->argument(0); |
| if (!obj.isObject()) |
| return throwVMError(exec, createTypeError(exec, ASCIILiteral("Object.isSealed can only be called on Objects."))); |
| JSObject* object = asObject(obj); |
| |
| if (isJSFinalObject(object)) |
| return JSValue::encode(jsBoolean(object->isSealed(exec->globalData()))); |
| |
| // 2. For each named own property name P of O, |
| PropertyNameArray properties(exec); |
| object->methodTable()->getOwnPropertyNames(object, exec, properties, IncludeDontEnumProperties); |
| PropertyNameArray::const_iterator end = properties.end(); |
| for (PropertyNameArray::const_iterator iter = properties.begin(); iter != end; ++iter) { |
| // a. Let desc be the result of calling the [[GetOwnProperty]] internal method of O with P. |
| PropertyDescriptor desc; |
| if (!object->methodTable()->getOwnPropertyDescriptor(object, exec, *iter, desc)) |
| continue; |
| // b. If desc.[[Configurable]] is true, then return false. |
| if (desc.configurable()) |
| return JSValue::encode(jsBoolean(false)); |
| } |
| |
| // 3. If the [[Extensible]] internal property of O is false, then return true. |
| // 4. Otherwise, return false. |
| return JSValue::encode(jsBoolean(!object->isExtensible())); |
| } |
| |
| EncodedJSValue JSC_HOST_CALL objectConstructorIsFrozen(ExecState* exec) |
| { |
| // 1. If Type(O) is not Object throw a TypeError exception. |
| JSValue obj = exec->argument(0); |
| if (!obj.isObject()) |
| return throwVMError(exec, createTypeError(exec, ASCIILiteral("Object.isFrozen can only be called on Objects."))); |
| JSObject* object = asObject(obj); |
| |
| if (isJSFinalObject(object)) |
| return JSValue::encode(jsBoolean(object->isFrozen(exec->globalData()))); |
| |
| // 2. For each named own property name P of O, |
| PropertyNameArray properties(exec); |
| object->methodTable()->getOwnPropertyNames(object, exec, properties, IncludeDontEnumProperties); |
| PropertyNameArray::const_iterator end = properties.end(); |
| for (PropertyNameArray::const_iterator iter = properties.begin(); iter != end; ++iter) { |
| // a. Let desc be the result of calling the [[GetOwnProperty]] internal method of O with P. |
| PropertyDescriptor desc; |
| if (!object->methodTable()->getOwnPropertyDescriptor(object, exec, *iter, desc)) |
| continue; |
| // b. If IsDataDescriptor(desc) is true then |
| // i. If desc.[[Writable]] is true, return false. c. If desc.[[Configurable]] is true, then return false. |
| if ((desc.isDataDescriptor() && desc.writable()) || desc.configurable()) |
| return JSValue::encode(jsBoolean(false)); |
| } |
| |
| // 3. If the [[Extensible]] internal property of O is false, then return true. |
| // 4. Otherwise, return false. |
| return JSValue::encode(jsBoolean(!object->isExtensible())); |
| } |
| |
| EncodedJSValue JSC_HOST_CALL objectConstructorIsExtensible(ExecState* exec) |
| { |
| JSValue obj = exec->argument(0); |
| if (!obj.isObject()) |
| return throwVMError(exec, createTypeError(exec, ASCIILiteral("Object.isExtensible can only be called on Objects."))); |
| return JSValue::encode(jsBoolean(asObject(obj)->isExtensible())); |
| } |
| |
| } // namespace JSC |
