JavaScriptCore-1097.13.tar.gz
[apple/javascriptcore.git] / runtime / ObjectConstructor.cpp
CommitLineData
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1/*
2 * Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
3 * Copyright (C) 2008 Apple Inc. All rights reserved.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 *
19 */
20
21#include "config.h"
22#include "ObjectConstructor.h"
23
f9bf01c6 24#include "Error.h"
14957cd0 25#include "ExceptionHelpers.h"
ba379fdc 26#include "JSFunction.h"
f9bf01c6 27#include "JSArray.h"
9dae56ea 28#include "JSGlobalObject.h"
14957cd0 29#include "Lookup.h"
9dae56ea 30#include "ObjectPrototype.h"
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31#include "PropertyDescriptor.h"
32#include "PropertyNameArray.h"
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33
34namespace JSC {
35
36ASSERT_CLASS_FITS_IN_CELL(ObjectConstructor);
37
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38static EncodedJSValue JSC_HOST_CALL objectConstructorGetPrototypeOf(ExecState*);
39static EncodedJSValue JSC_HOST_CALL objectConstructorGetOwnPropertyDescriptor(ExecState*);
40static EncodedJSValue JSC_HOST_CALL objectConstructorGetOwnPropertyNames(ExecState*);
41static EncodedJSValue JSC_HOST_CALL objectConstructorKeys(ExecState*);
42static EncodedJSValue JSC_HOST_CALL objectConstructorDefineProperty(ExecState*);
43static EncodedJSValue JSC_HOST_CALL objectConstructorDefineProperties(ExecState*);
44static EncodedJSValue JSC_HOST_CALL objectConstructorCreate(ExecState*);
45static EncodedJSValue JSC_HOST_CALL objectConstructorSeal(ExecState*);
46static EncodedJSValue JSC_HOST_CALL objectConstructorFreeze(ExecState*);
47static EncodedJSValue JSC_HOST_CALL objectConstructorPreventExtensions(ExecState*);
48static EncodedJSValue JSC_HOST_CALL objectConstructorIsSealed(ExecState*);
49static EncodedJSValue JSC_HOST_CALL objectConstructorIsFrozen(ExecState*);
50static EncodedJSValue JSC_HOST_CALL objectConstructorIsExtensible(ExecState*);
f9bf01c6 51
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52}
53
54#include "ObjectConstructor.lut.h"
55
56namespace JSC {
57
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58ASSERT_HAS_TRIVIAL_DESTRUCTOR(ObjectConstructor);
59
60const ClassInfo ObjectConstructor::s_info = { "Function", &InternalFunction::s_info, 0, ExecState::objectConstructorTable, CREATE_METHOD_TABLE(ObjectConstructor) };
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61
62/* Source for ObjectConstructor.lut.h
63@begin objectConstructorTable
64 getPrototypeOf objectConstructorGetPrototypeOf DontEnum|Function 1
65 getOwnPropertyDescriptor objectConstructorGetOwnPropertyDescriptor DontEnum|Function 2
66 getOwnPropertyNames objectConstructorGetOwnPropertyNames DontEnum|Function 1
67 keys objectConstructorKeys DontEnum|Function 1
68 defineProperty objectConstructorDefineProperty DontEnum|Function 3
69 defineProperties objectConstructorDefineProperties DontEnum|Function 2
70 create objectConstructorCreate DontEnum|Function 2
71 seal objectConstructorSeal DontEnum|Function 1
72 freeze objectConstructorFreeze DontEnum|Function 1
73 preventExtensions objectConstructorPreventExtensions DontEnum|Function 1
74 isSealed objectConstructorIsSealed DontEnum|Function 1
75 isFrozen objectConstructorIsFrozen DontEnum|Function 1
76 isExtensible objectConstructorIsExtensible DontEnum|Function 1
77@end
78*/
79
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80ObjectConstructor::ObjectConstructor(JSGlobalObject* globalObject, Structure* structure)
81 : InternalFunction(globalObject, structure)
9dae56ea 82{
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83}
84
85void ObjectConstructor::finishCreation(ExecState* exec, ObjectPrototype* objectPrototype)
86{
87 Base::finishCreation(exec->globalData(), Identifier(exec, "Object"));
9dae56ea 88 // ECMA 15.2.3.1
14957cd0 89 putDirectWithoutTransition(exec->globalData(), exec->propertyNames().prototype, objectPrototype, DontEnum | DontDelete | ReadOnly);
9dae56ea 90 // no. of arguments for constructor
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91 putDirectWithoutTransition(exec->globalData(), exec->propertyNames().length, jsNumber(1), ReadOnly | DontEnum | DontDelete);
92}
93
6fe7ccc8 94bool ObjectConstructor::getOwnPropertySlot(JSCell* cell, ExecState* exec, const Identifier& propertyName, PropertySlot &slot)
14957cd0 95{
6fe7ccc8 96 return getStaticFunctionSlot<JSObject>(exec, ExecState::objectConstructorTable(exec), jsCast<ObjectConstructor*>(cell), propertyName, slot);
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97}
98
6fe7ccc8 99bool ObjectConstructor::getOwnPropertyDescriptor(JSObject* object, ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
14957cd0 100{
6fe7ccc8 101 return getStaticFunctionDescriptor<JSObject>(exec, ExecState::objectConstructorTable(exec), jsCast<ObjectConstructor*>(object), propertyName, descriptor);
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102}
103
104// ECMA 15.2.2
14957cd0 105static ALWAYS_INLINE JSObject* constructObject(ExecState* exec, JSGlobalObject* globalObject, const ArgList& args)
9dae56ea 106{
ba379fdc 107 JSValue arg = args.at(0);
9dae56ea 108 if (arg.isUndefinedOrNull())
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109 return constructEmptyObject(exec, globalObject);
110 return arg.toObject(exec, globalObject);
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111}
112
14957cd0 113static EncodedJSValue JSC_HOST_CALL constructWithObjectConstructor(ExecState* exec)
9dae56ea 114{
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115 ArgList args(exec);
116 return JSValue::encode(constructObject(exec, asInternalFunction(exec->callee())->globalObject(), args));
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117}
118
6fe7ccc8 119ConstructType ObjectConstructor::getConstructData(JSCell*, ConstructData& constructData)
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120{
121 constructData.native.function = constructWithObjectConstructor;
122 return ConstructTypeHost;
123}
124
14957cd0 125static EncodedJSValue JSC_HOST_CALL callObjectConstructor(ExecState* exec)
9dae56ea 126{
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127 ArgList args(exec);
128 return JSValue::encode(constructObject(exec, asInternalFunction(exec->callee())->globalObject(), args));
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129}
130
6fe7ccc8 131CallType ObjectConstructor::getCallData(JSCell*, CallData& callData)
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132{
133 callData.native.function = callObjectConstructor;
134 return CallTypeHost;
135}
136
14957cd0 137EncodedJSValue JSC_HOST_CALL objectConstructorGetPrototypeOf(ExecState* exec)
f9bf01c6 138{
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139 if (!exec->argument(0).isObject())
140 return throwVMError(exec, createTypeError(exec, "Requested prototype of a value that is not an object."));
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141 JSObject* object = asObject(exec->argument(0));
142 if (!object->allowsAccessFrom(exec->trueCallerFrame()))
143 return JSValue::encode(jsUndefined());
144 return JSValue::encode(object->prototype());
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145}
146
14957cd0 147EncodedJSValue JSC_HOST_CALL objectConstructorGetOwnPropertyDescriptor(ExecState* exec)
f9bf01c6 148{
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149 if (!exec->argument(0).isObject())
150 return throwVMError(exec, createTypeError(exec, "Requested property descriptor of a value that is not an object."));
6fe7ccc8 151 UString propertyName = exec->argument(1).toString(exec)->value(exec);
f9bf01c6 152 if (exec->hadException())
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153 return JSValue::encode(jsNull());
154 JSObject* object = asObject(exec->argument(0));
f9bf01c6 155 PropertyDescriptor descriptor;
6fe7ccc8 156 if (!object->methodTable()->getOwnPropertyDescriptor(object, exec, Identifier(exec, propertyName), descriptor))
14957cd0 157 return JSValue::encode(jsUndefined());
f9bf01c6 158 if (exec->hadException())
14957cd0 159 return JSValue::encode(jsUndefined());
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160
161 JSObject* description = constructEmptyObject(exec);
162 if (!descriptor.isAccessorDescriptor()) {
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163 description->putDirect(exec->globalData(), exec->propertyNames().value, descriptor.value() ? descriptor.value() : jsUndefined(), 0);
164 description->putDirect(exec->globalData(), exec->propertyNames().writable, jsBoolean(descriptor.writable()), 0);
f9bf01c6 165 } else {
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166 ASSERT(descriptor.getter());
167 ASSERT(descriptor.setter());
168 description->putDirect(exec->globalData(), exec->propertyNames().get, descriptor.getter(), 0);
169 description->putDirect(exec->globalData(), exec->propertyNames().set, descriptor.setter(), 0);
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170 }
171
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172 description->putDirect(exec->globalData(), exec->propertyNames().enumerable, jsBoolean(descriptor.enumerable()), 0);
173 description->putDirect(exec->globalData(), exec->propertyNames().configurable, jsBoolean(descriptor.configurable()), 0);
f9bf01c6 174
14957cd0 175 return JSValue::encode(description);
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176}
177
178// FIXME: Use the enumeration cache.
14957cd0 179EncodedJSValue JSC_HOST_CALL objectConstructorGetOwnPropertyNames(ExecState* exec)
f9bf01c6 180{
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181 if (!exec->argument(0).isObject())
182 return throwVMError(exec, createTypeError(exec, "Requested property names of a value that is not an object."));
f9bf01c6 183 PropertyNameArray properties(exec);
6fe7ccc8 184 asObject(exec->argument(0))->methodTable()->getOwnPropertyNames(asObject(exec->argument(0)), exec, properties, IncludeDontEnumProperties);
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185 JSArray* names = constructEmptyArray(exec);
186 size_t numProperties = properties.size();
187 for (size_t i = 0; i < numProperties; i++)
188 names->push(exec, jsOwnedString(exec, properties[i].ustring()));
14957cd0 189 return JSValue::encode(names);
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190}
191
192// FIXME: Use the enumeration cache.
14957cd0 193EncodedJSValue JSC_HOST_CALL objectConstructorKeys(ExecState* exec)
f9bf01c6 194{
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195 if (!exec->argument(0).isObject())
196 return throwVMError(exec, createTypeError(exec, "Requested keys of a value that is not an object."));
f9bf01c6 197 PropertyNameArray properties(exec);
6fe7ccc8 198 asObject(exec->argument(0))->methodTable()->getOwnPropertyNames(asObject(exec->argument(0)), exec, properties, ExcludeDontEnumProperties);
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199 JSArray* keys = constructEmptyArray(exec);
200 size_t numProperties = properties.size();
201 for (size_t i = 0; i < numProperties; i++)
202 keys->push(exec, jsOwnedString(exec, properties[i].ustring()));
14957cd0 203 return JSValue::encode(keys);
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204}
205
206// ES5 8.10.5 ToPropertyDescriptor
207static bool toPropertyDescriptor(ExecState* exec, JSValue in, PropertyDescriptor& desc)
208{
209 if (!in.isObject()) {
14957cd0 210 throwError(exec, createTypeError(exec, "Property description must be an object."));
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211 return false;
212 }
213 JSObject* description = asObject(in);
214
215 PropertySlot enumerableSlot(description);
216 if (description->getPropertySlot(exec, exec->propertyNames().enumerable, enumerableSlot)) {
217 desc.setEnumerable(enumerableSlot.getValue(exec, exec->propertyNames().enumerable).toBoolean(exec));
218 if (exec->hadException())
219 return false;
220 }
221
222 PropertySlot configurableSlot(description);
223 if (description->getPropertySlot(exec, exec->propertyNames().configurable, configurableSlot)) {
224 desc.setConfigurable(configurableSlot.getValue(exec, exec->propertyNames().configurable).toBoolean(exec));
225 if (exec->hadException())
226 return false;
227 }
228
229 JSValue value;
230 PropertySlot valueSlot(description);
231 if (description->getPropertySlot(exec, exec->propertyNames().value, valueSlot)) {
232 desc.setValue(valueSlot.getValue(exec, exec->propertyNames().value));
233 if (exec->hadException())
234 return false;
235 }
236
237 PropertySlot writableSlot(description);
238 if (description->getPropertySlot(exec, exec->propertyNames().writable, writableSlot)) {
239 desc.setWritable(writableSlot.getValue(exec, exec->propertyNames().writable).toBoolean(exec));
240 if (exec->hadException())
241 return false;
242 }
243
244 PropertySlot getSlot(description);
245 if (description->getPropertySlot(exec, exec->propertyNames().get, getSlot)) {
246 JSValue get = getSlot.getValue(exec, exec->propertyNames().get);
247 if (exec->hadException())
248 return false;
249 if (!get.isUndefined()) {
250 CallData callData;
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251 if (getCallData(get, callData) == CallTypeNone) {
252 throwError(exec, createTypeError(exec, "Getter must be a function."));
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253 return false;
254 }
6fe7ccc8 255 }
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256 desc.setGetter(get);
257 }
258
259 PropertySlot setSlot(description);
260 if (description->getPropertySlot(exec, exec->propertyNames().set, setSlot)) {
261 JSValue set = setSlot.getValue(exec, exec->propertyNames().set);
262 if (exec->hadException())
263 return false;
264 if (!set.isUndefined()) {
265 CallData callData;
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266 if (getCallData(set, callData) == CallTypeNone) {
267 throwError(exec, createTypeError(exec, "Setter must be a function."));
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268 return false;
269 }
6fe7ccc8 270 }
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271 desc.setSetter(set);
272 }
273
274 if (!desc.isAccessorDescriptor())
275 return true;
276
277 if (desc.value()) {
14957cd0 278 throwError(exec, createTypeError(exec, "Invalid property. 'value' present on property with getter or setter."));
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279 return false;
280 }
281
282 if (desc.writablePresent()) {
14957cd0 283 throwError(exec, createTypeError(exec, "Invalid property. 'writable' present on property with getter or setter."));
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284 return false;
285 }
286 return true;
287}
288
14957cd0 289EncodedJSValue JSC_HOST_CALL objectConstructorDefineProperty(ExecState* exec)
f9bf01c6 290{
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291 if (!exec->argument(0).isObject())
292 return throwVMError(exec, createTypeError(exec, "Properties can only be defined on Objects."));
293 JSObject* O = asObject(exec->argument(0));
6fe7ccc8 294 UString propertyName = exec->argument(1).toString(exec)->value(exec);
f9bf01c6 295 if (exec->hadException())
14957cd0 296 return JSValue::encode(jsNull());
f9bf01c6 297 PropertyDescriptor descriptor;
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298 if (!toPropertyDescriptor(exec, exec->argument(2), descriptor))
299 return JSValue::encode(jsNull());
6fe7ccc8 300 ASSERT((descriptor.attributes() & Accessor) || (!descriptor.isAccessorDescriptor()));
f9bf01c6 301 ASSERT(!exec->hadException());
6fe7ccc8 302 O->methodTable()->defineOwnProperty(O, exec, Identifier(exec, propertyName), descriptor, true);
14957cd0 303 return JSValue::encode(O);
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304}
305
306static JSValue defineProperties(ExecState* exec, JSObject* object, JSObject* properties)
307{
308 PropertyNameArray propertyNames(exec);
6fe7ccc8 309 asObject(properties)->methodTable()->getOwnPropertyNames(asObject(properties), exec, propertyNames, ExcludeDontEnumProperties);
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310 size_t numProperties = propertyNames.size();
311 Vector<PropertyDescriptor> descriptors;
312 MarkedArgumentBuffer markBuffer;
313 for (size_t i = 0; i < numProperties; i++) {
314 PropertySlot slot;
315 JSValue prop = properties->get(exec, propertyNames[i]);
316 if (exec->hadException())
317 return jsNull();
318 PropertyDescriptor descriptor;
319 if (!toPropertyDescriptor(exec, prop, descriptor))
320 return jsNull();
321 descriptors.append(descriptor);
322 // Ensure we mark all the values that we're accumulating
323 if (descriptor.isDataDescriptor() && descriptor.value())
324 markBuffer.append(descriptor.value());
325 if (descriptor.isAccessorDescriptor()) {
326 if (descriptor.getter())
327 markBuffer.append(descriptor.getter());
328 if (descriptor.setter())
329 markBuffer.append(descriptor.setter());
330 }
331 }
332 for (size_t i = 0; i < numProperties; i++) {
6fe7ccc8 333 object->methodTable()->defineOwnProperty(object, exec, propertyNames[i], descriptors[i], true);
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334 if (exec->hadException())
335 return jsNull();
336 }
337 return object;
338}
339
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340EncodedJSValue JSC_HOST_CALL objectConstructorDefineProperties(ExecState* exec)
341{
342 if (!exec->argument(0).isObject())
343 return throwVMError(exec, createTypeError(exec, "Properties can only be defined on Objects."));
6fe7ccc8 344 return JSValue::encode(defineProperties(exec, asObject(exec->argument(0)), exec->argument(1).toObject(exec)));
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345}
346
347EncodedJSValue JSC_HOST_CALL objectConstructorCreate(ExecState* exec)
348{
349 if (!exec->argument(0).isObject() && !exec->argument(0).isNull())
350 return throwVMError(exec, createTypeError(exec, "Object prototype may only be an Object or null."));
351 JSValue proto = exec->argument(0);
352 JSObject* newObject = proto.isObject() ? constructEmptyObject(exec, asObject(proto)->inheritorID(exec->globalData())) : constructEmptyObject(exec, exec->lexicalGlobalObject()->nullPrototypeObjectStructure());
353 if (exec->argument(1).isUndefined())
354 return JSValue::encode(newObject);
355 if (!exec->argument(1).isObject())
356 return throwVMError(exec, createTypeError(exec, "Property descriptor list must be an Object."));
357 return JSValue::encode(defineProperties(exec, newObject, asObject(exec->argument(1))));
358}
359
360EncodedJSValue JSC_HOST_CALL objectConstructorSeal(ExecState* exec)
361{
6fe7ccc8 362 // 1. If Type(O) is not Object throw a TypeError exception.
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363 JSValue obj = exec->argument(0);
364 if (!obj.isObject())
365 return throwVMError(exec, createTypeError(exec, "Object.seal can only be called on Objects."));
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366 JSObject* object = asObject(obj);
367
368 if (isJSFinalObject(object)) {
369 object->seal(exec->globalData());
370 return JSValue::encode(obj);
371 }
372
373 // 2. For each named own property name P of O,
374 PropertyNameArray properties(exec);
375 object->methodTable()->getOwnPropertyNames(object, exec, properties, IncludeDontEnumProperties);
376 PropertyNameArray::const_iterator end = properties.end();
377 for (PropertyNameArray::const_iterator iter = properties.begin(); iter != end; ++iter) {
378 // a. Let desc be the result of calling the [[GetOwnProperty]] internal method of O with P.
379 PropertyDescriptor desc;
380 if (!object->methodTable()->getOwnPropertyDescriptor(object, exec, *iter, desc))
381 continue;
382 // b. If desc.[[Configurable]] is true, set desc.[[Configurable]] to false.
383 desc.setConfigurable(false);
384 // c. Call the [[DefineOwnProperty]] internal method of O with P, desc, and true as arguments.
385 object->methodTable()->defineOwnProperty(object, exec, *iter, desc, true);
386 if (exec->hadException())
387 return JSValue::encode(obj);
388 }
389
390 // 3. Set the [[Extensible]] internal property of O to false.
391 object->preventExtensions(exec->globalData());
392
393 // 4. Return O.
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394 return JSValue::encode(obj);
395}
396
397EncodedJSValue JSC_HOST_CALL objectConstructorFreeze(ExecState* exec)
398{
6fe7ccc8 399 // 1. If Type(O) is not Object throw a TypeError exception.
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400 JSValue obj = exec->argument(0);
401 if (!obj.isObject())
402 return throwVMError(exec, createTypeError(exec, "Object.freeze can only be called on Objects."));
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403 JSObject* object = asObject(obj);
404
405 if (isJSFinalObject(object)) {
406 object->freeze(exec->globalData());
407 return JSValue::encode(obj);
408 }
409
410 // 2. For each named own property name P of O,
411 PropertyNameArray properties(exec);
412 object->methodTable()->getOwnPropertyNames(object, exec, properties, IncludeDontEnumProperties);
413 PropertyNameArray::const_iterator end = properties.end();
414 for (PropertyNameArray::const_iterator iter = properties.begin(); iter != end; ++iter) {
415 // a. Let desc be the result of calling the [[GetOwnProperty]] internal method of O with P.
416 PropertyDescriptor desc;
417 if (!object->methodTable()->getOwnPropertyDescriptor(object, exec, *iter, desc))
418 continue;
419 // b. If IsDataDescriptor(desc) is true, then
420 // i. If desc.[[Writable]] is true, set desc.[[Writable]] to false.
421 if (desc.isDataDescriptor())
422 desc.setWritable(false);
423 // c. If desc.[[Configurable]] is true, set desc.[[Configurable]] to false.
424 desc.setConfigurable(false);
425 // d. Call the [[DefineOwnProperty]] internal method of O with P, desc, and true as arguments.
426 object->methodTable()->defineOwnProperty(object, exec, *iter, desc, true);
427 if (exec->hadException())
428 return JSValue::encode(obj);
429 }
430
431 // 3. Set the [[Extensible]] internal property of O to false.
432 object->preventExtensions(exec->globalData());
433
434 // 4. Return O.
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435 return JSValue::encode(obj);
436}
437
438EncodedJSValue JSC_HOST_CALL objectConstructorPreventExtensions(ExecState* exec)
439{
440 JSValue obj = exec->argument(0);
441 if (!obj.isObject())
442 return throwVMError(exec, createTypeError(exec, "Object.preventExtensions can only be called on Objects."));
443 asObject(obj)->preventExtensions(exec->globalData());
444 return JSValue::encode(obj);
445}
446
447EncodedJSValue JSC_HOST_CALL objectConstructorIsSealed(ExecState* exec)
448{
6fe7ccc8 449 // 1. If Type(O) is not Object throw a TypeError exception.
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450 JSValue obj = exec->argument(0);
451 if (!obj.isObject())
452 return throwVMError(exec, createTypeError(exec, "Object.isSealed can only be called on Objects."));
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453 JSObject* object = asObject(obj);
454
455 if (isJSFinalObject(object))
456 return JSValue::encode(jsBoolean(object->isSealed(exec->globalData())));
457
458 // 2. For each named own property name P of O,
459 PropertyNameArray properties(exec);
460 object->methodTable()->getOwnPropertyNames(object, exec, properties, IncludeDontEnumProperties);
461 PropertyNameArray::const_iterator end = properties.end();
462 for (PropertyNameArray::const_iterator iter = properties.begin(); iter != end; ++iter) {
463 // a. Let desc be the result of calling the [[GetOwnProperty]] internal method of O with P.
464 PropertyDescriptor desc;
465 if (!object->methodTable()->getOwnPropertyDescriptor(object, exec, *iter, desc))
466 continue;
467 // b. If desc.[[Configurable]] is true, then return false.
468 if (desc.configurable())
469 return JSValue::encode(jsBoolean(false));
470 }
471
472 // 3. If the [[Extensible]] internal property of O is false, then return true.
473 // 4. Otherwise, return false.
474 return JSValue::encode(jsBoolean(!object->isExtensible()));
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475}
476
477EncodedJSValue JSC_HOST_CALL objectConstructorIsFrozen(ExecState* exec)
f9bf01c6 478{
6fe7ccc8 479 // 1. If Type(O) is not Object throw a TypeError exception.
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480 JSValue obj = exec->argument(0);
481 if (!obj.isObject())
482 return throwVMError(exec, createTypeError(exec, "Object.isFrozen can only be called on Objects."));
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483 JSObject* object = asObject(obj);
484
485 if (isJSFinalObject(object))
486 return JSValue::encode(jsBoolean(object->isFrozen(exec->globalData())));
487
488 // 2. For each named own property name P of O,
489 PropertyNameArray properties(exec);
490 object->methodTable()->getOwnPropertyNames(object, exec, properties, IncludeDontEnumProperties);
491 PropertyNameArray::const_iterator end = properties.end();
492 for (PropertyNameArray::const_iterator iter = properties.begin(); iter != end; ++iter) {
493 // a. Let desc be the result of calling the [[GetOwnProperty]] internal method of O with P.
494 PropertyDescriptor desc;
495 if (!object->methodTable()->getOwnPropertyDescriptor(object, exec, *iter, desc))
496 continue;
497 // b. If IsDataDescriptor(desc) is true then
498 // i. If desc.[[Writable]] is true, return false. c. If desc.[[Configurable]] is true, then return false.
499 if ((desc.isDataDescriptor() && desc.writable()) || desc.configurable())
500 return JSValue::encode(jsBoolean(false));
501 }
502
503 // 3. If the [[Extensible]] internal property of O is false, then return true.
504 // 4. Otherwise, return false.
505 return JSValue::encode(jsBoolean(!object->isExtensible()));
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506}
507
14957cd0 508EncodedJSValue JSC_HOST_CALL objectConstructorIsExtensible(ExecState* exec)
f9bf01c6 509{
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510 JSValue obj = exec->argument(0);
511 if (!obj.isObject())
512 return throwVMError(exec, createTypeError(exec, "Object.isExtensible can only be called on Objects."));
513 return JSValue::encode(jsBoolean(asObject(obj)->isExtensible()));
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514}
515
9dae56ea 516} // namespace JSC