1 /* 2 * Copyright (C) 2009, 2011 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include "config.h" 32 #include "bindings/core/v8/V8Window.h" 33 34 #include "bindings/core/v8/V8HTMLCollection.h" 35 #include "bindings/core/v8/V8Node.h" 36 #include "bindings/v8/BindingSecurity.h" 37 #include "bindings/v8/ExceptionMessages.h" 38 #include "bindings/v8/ExceptionState.h" 39 #include "bindings/v8/ScheduledAction.h" 40 #include "bindings/v8/ScriptController.h" 41 #include "bindings/v8/ScriptSourceCode.h" 42 #include "bindings/v8/SerializedScriptValue.h" 43 #include "bindings/v8/V8Binding.h" 44 #include "bindings/v8/V8EventListener.h" 45 #include "bindings/v8/V8EventListenerList.h" 46 #include "bindings/v8/V8GCForContextDispose.h" 47 #include "bindings/v8/V8HiddenValue.h" 48 #include "core/dom/ExceptionCode.h" 49 #include "core/dom/MessagePort.h" 50 #include "core/html/HTMLCollection.h" 51 #include "core/html/HTMLDocument.h" 52 #include "core/inspector/ScriptCallStack.h" 53 #include "core/loader/FrameLoadRequest.h" 54 #include "core/loader/FrameLoader.h" 55 #include "core/frame/DOMTimer.h" 56 #include "core/frame/LocalDOMWindow.h" 57 #include "core/frame/DOMWindowTimers.h" 58 #include "core/frame/FrameView.h" 59 #include "core/frame/LocalFrame.h" 60 #include "core/frame/Settings.h" 61 #include "core/frame/csp/ContentSecurityPolicy.h" 62 #include "core/storage/Storage.h" 63 #include "platform/PlatformScreen.h" 64 #include "platform/graphics/media/MediaPlayer.h" 65 #include "wtf/ArrayBuffer.h" 66 #include "wtf/Assertions.h" 67 #include "wtf/OwnPtr.h" 68 69 namespace WebCore { 70 71 // FIXME: There is a lot of duplication with SetTimeoutOrInterval() in V8WorkerGlobalScopeCustom.cpp. 72 // We should refactor this. 73 static void windowSetTimeoutImpl(const v8::FunctionCallbackInfo<v8::Value>& info, bool singleShot, ExceptionState& exceptionState) 74 { 75 int argumentCount = info.Length(); 76 77 if (argumentCount < 1) 78 return; 79 80 LocalDOMWindow* impl = V8Window::toNative(info.Holder()); 81 if (!impl->frame() || !impl->document()) { 82 exceptionState.throwDOMException(InvalidAccessError, "No script context is available in which to execute the script."); 83 return; 84 } 85 ScriptState* scriptState = ScriptState::current(info.GetIsolate()); 86 v8::Handle<v8::Value> function = info[0]; 87 String functionString; 88 if (!function->IsFunction()) { 89 if (function->IsString()) { 90 functionString = toCoreString(function.As<v8::String>()); 91 } else { 92 v8::Handle<v8::String> v8String = function->ToString(); 93 94 // Bail out if string conversion failed. 95 if (v8String.IsEmpty()) 96 return; 97 98 functionString = toCoreString(v8String); 99 } 100 101 // Don't allow setting timeouts to run empty functions! 102 // (Bug 1009597) 103 if (!functionString.length()) 104 return; 105 } 106 107 if (!BindingSecurity::shouldAllowAccessToFrame(info.GetIsolate(), impl->frame(), exceptionState)) 108 return; 109 110 OwnPtr<ScheduledAction> action; 111 if (function->IsFunction()) { 112 int paramCount = argumentCount >= 2 ? argumentCount - 2 : 0; 113 OwnPtr<v8::Local<v8::Value>[]> params; 114 if (paramCount > 0) { 115 params = adoptArrayPtr(new v8::Local<v8::Value>[paramCount]); 116 for (int i = 0; i < paramCount; i++) { 117 // parameters must be globalized 118 params[i] = info[i+2]; 119 } 120 } 121 122 // params is passed to action, and released in action's destructor 123 ASSERT(impl->frame()); 124 action = adoptPtr(new ScheduledAction(scriptState, v8::Handle<v8::Function>::Cast(function), paramCount, params.get(), info.GetIsolate())); 125 } else { 126 if (impl->document() && !impl->document()->contentSecurityPolicy()->allowEval()) { 127 v8SetReturnValue(info, 0); 128 return; 129 } 130 ASSERT(impl->frame()); 131 action = adoptPtr(new ScheduledAction(scriptState, functionString, KURL(), info.GetIsolate())); 132 } 133 134 int32_t timeout = argumentCount >= 2 ? info[1]->Int32Value() : 0; 135 int timerId; 136 if (singleShot) 137 timerId = DOMWindowTimers::setTimeout(*impl, action.release(), timeout); 138 else 139 timerId = DOMWindowTimers::setInterval(*impl, action.release(), timeout); 140 141 // Try to do the idle notification before the timeout expires to get better 142 // use of any idle time. Aim for the middle of the interval for simplicity. 143 if (timeout >= 0) { 144 double maximumFireInterval = static_cast<double>(timeout) / 1000 / 2; 145 V8GCForContextDispose::instanceTemplate().notifyIdleSooner(maximumFireInterval); 146 } 147 148 v8SetReturnValue(info, timerId); 149 } 150 151 void V8Window::eventAttributeGetterCustom(const v8::PropertyCallbackInfo<v8::Value>& info) 152 { 153 LocalFrame* frame = V8Window::toNative(info.Holder())->frame(); 154 ExceptionState exceptionState(ExceptionState::GetterContext, "event", "Window", info.Holder(), info.GetIsolate()); 155 if (!BindingSecurity::shouldAllowAccessToFrame(info.GetIsolate(), frame, exceptionState)) { 156 exceptionState.throwIfNeeded(); 157 return; 158 } 159 160 v8::Handle<v8::Value> jsEvent = V8HiddenValue::getHiddenValue(info.GetIsolate(), info.Holder()->CreationContext()->Global(), V8HiddenValue::event(info.GetIsolate())); 161 if (jsEvent.IsEmpty()) 162 return; 163 v8SetReturnValue(info, jsEvent); 164 } 165 166 void V8Window::eventAttributeSetterCustom(v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<void>& info) 167 { 168 LocalFrame* frame = V8Window::toNative(info.Holder())->frame(); 169 ExceptionState exceptionState(ExceptionState::SetterContext, "event", "Window", info.Holder(), info.GetIsolate()); 170 if (!BindingSecurity::shouldAllowAccessToFrame(info.GetIsolate(), frame, exceptionState)) { 171 exceptionState.throwIfNeeded(); 172 return; 173 } 174 175 V8HiddenValue::setHiddenValue(info.GetIsolate(), info.Holder()->CreationContext()->Global(), V8HiddenValue::event(info.GetIsolate()), value); 176 } 177 178 void V8Window::frameElementAttributeGetterCustom(const v8::PropertyCallbackInfo<v8::Value>& info) 179 { 180 LocalDOMWindow* impl = V8Window::toNative(info.Holder()); 181 ExceptionState exceptionState(ExceptionState::GetterContext, "frame", "Window", info.Holder(), info.GetIsolate()); 182 if (!BindingSecurity::shouldAllowAccessToNode(info.GetIsolate(), impl->frameElement(), exceptionState)) { 183 v8SetReturnValueNull(info); 184 exceptionState.throwIfNeeded(); 185 return; 186 } 187 188 // The wrapper for an <iframe> should get its prototype from the context of the frame it's in, rather than its own frame. 189 // So, use its containing document as the creation context when wrapping. 190 v8::Handle<v8::Value> creationContext = toV8(&impl->frameElement()->document(), info.Holder(), info.GetIsolate()); 191 RELEASE_ASSERT(!creationContext.IsEmpty()); 192 v8::Handle<v8::Value> wrapper = toV8(impl->frameElement(), v8::Handle<v8::Object>::Cast(creationContext), info.GetIsolate()); 193 v8SetReturnValue(info, wrapper); 194 } 195 196 void V8Window::openerAttributeSetterCustom(v8::Local<v8::Value> value, const v8::PropertyCallbackInfo<void>& info) 197 { 198 LocalDOMWindow* impl = V8Window::toNative(info.Holder()); 199 ExceptionState exceptionState(ExceptionState::SetterContext, "opener", "Window", info.Holder(), info.GetIsolate()); 200 if (!BindingSecurity::shouldAllowAccessToFrame(info.GetIsolate(), impl->frame(), exceptionState)) { 201 exceptionState.throwIfNeeded(); 202 return; 203 } 204 205 // Opener can be shadowed if it is in the same domain. 206 // Have a special handling of null value to behave 207 // like Firefox. See bug http://b/1224887 & http://b/791706. 208 if (value->IsNull()) { 209 // impl->frame() cannot be null, 210 // otherwise, SameOrigin check would have failed. 211 ASSERT(impl->frame()); 212 impl->frame()->loader().setOpener(0); 213 } 214 215 // Delete the accessor from this object. 216 info.Holder()->Delete(v8AtomicString(info.GetIsolate(), "opener")); 217 218 // Put property on the front (this) object. 219 if (info.This()->IsObject()) 220 v8::Handle<v8::Object>::Cast(info.This())->Set(v8AtomicString(info.GetIsolate(), "opener"), value); 221 } 222 223 static bool isLegacyTargetOriginDesignation(v8::Handle<v8::Value> value) 224 { 225 if (value->IsString() || value->IsStringObject()) 226 return true; 227 return false; 228 } 229 230 231 void V8Window::postMessageMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info) 232 { 233 // None of these need to be RefPtr because info and context are guaranteed 234 // to hold on to them. 235 LocalDOMWindow* window = V8Window::toNative(info.Holder()); 236 LocalDOMWindow* source = callingDOMWindow(info.GetIsolate()); 237 238 ExceptionState exceptionState(ExceptionState::ExecutionContext, "postMessage", "Window", info.Holder(), info.GetIsolate()); 239 240 // If called directly by WebCore we don't have a calling context. 241 if (!source) { 242 exceptionState.throwTypeError("No active calling context exists."); 243 exceptionState.throwIfNeeded(); 244 return; 245 } 246 247 // This function has variable arguments and can be: 248 // Per current spec: 249 // postMessage(message, targetOrigin) 250 // postMessage(message, targetOrigin, {sequence of transferrables}) 251 // Legacy non-standard implementations in webkit allowed: 252 // postMessage(message, {sequence of transferrables}, targetOrigin); 253 MessagePortArray portArray; 254 ArrayBufferArray arrayBufferArray; 255 int targetOriginArgIndex = 1; 256 if (info.Length() > 2) { 257 int transferablesArgIndex = 2; 258 if (isLegacyTargetOriginDesignation(info[2])) { 259 targetOriginArgIndex = 2; 260 transferablesArgIndex = 1; 261 } 262 if (!SerializedScriptValue::extractTransferables(info[transferablesArgIndex], transferablesArgIndex, portArray, arrayBufferArray, exceptionState, info.GetIsolate())) { 263 exceptionState.throwIfNeeded(); 264 return; 265 } 266 } 267 TOSTRING_VOID(V8StringResource<WithUndefinedOrNullCheck>, targetOrigin, info[targetOriginArgIndex]); 268 269 RefPtr<SerializedScriptValue> message = SerializedScriptValue::create(info[0], &portArray, &arrayBufferArray, exceptionState, info.GetIsolate()); 270 if (exceptionState.throwIfNeeded()) 271 return; 272 273 window->postMessage(message.release(), &portArray, targetOrigin, source, exceptionState); 274 exceptionState.throwIfNeeded(); 275 } 276 277 // FIXME(fqian): returning string is cheating, and we should 278 // fix this by calling toString function on the receiver. 279 // However, V8 implements toString in JavaScript, which requires 280 // switching context of receiver. I consider it is dangerous. 281 void V8Window::toStringMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info) 282 { 283 v8::Handle<v8::Object> domWrapper = V8Window::findInstanceInPrototypeChain(info.This(), info.GetIsolate()); 284 if (domWrapper.IsEmpty()) { 285 v8SetReturnValue(info, info.This()->ObjectProtoToString()); 286 return; 287 } 288 v8SetReturnValue(info, domWrapper->ObjectProtoToString()); 289 } 290 291 class DialogHandler { 292 public: 293 explicit DialogHandler(v8::Handle<v8::Value> dialogArguments, ScriptState* scriptState) 294 : m_scriptState(scriptState) 295 , m_dialogArguments(dialogArguments) 296 { 297 } 298 299 void dialogCreated(LocalDOMWindow*); 300 v8::Handle<v8::Value> returnValue() const; 301 302 private: 303 RefPtr<ScriptState> m_scriptState; 304 RefPtr<ScriptState> m_scriptStateForDialogFrame; 305 v8::Handle<v8::Value> m_dialogArguments; 306 }; 307 308 void DialogHandler::dialogCreated(LocalDOMWindow* dialogFrame) 309 { 310 if (m_dialogArguments.IsEmpty()) 311 return; 312 v8::Handle<v8::Context> context = toV8Context(dialogFrame->frame(), m_scriptState->world()); 313 if (context.IsEmpty()) 314 return; 315 m_scriptStateForDialogFrame = ScriptState::from(context); 316 317 ScriptState::Scope scope(m_scriptStateForDialogFrame.get()); 318 m_scriptStateForDialogFrame->context()->Global()->Set(v8AtomicString(m_scriptState->isolate(), "dialogArguments"), m_dialogArguments); 319 } 320 321 v8::Handle<v8::Value> DialogHandler::returnValue() const 322 { 323 if (!m_scriptStateForDialogFrame) 324 return v8Undefined(); 325 ASSERT(!m_scriptStateForDialogFrame->contextIsEmpty()); 326 327 v8::Isolate* isolate = m_scriptStateForDialogFrame->isolate(); 328 v8::EscapableHandleScope handleScope(isolate); 329 ScriptState::Scope scope(m_scriptStateForDialogFrame.get()); 330 v8::Local<v8::Value> returnValue = m_scriptStateForDialogFrame->context()->Global()->Get(v8AtomicString(isolate, "returnValue")); 331 if (returnValue.IsEmpty()) 332 return v8Undefined(); 333 return handleScope.Escape(returnValue); 334 } 335 336 static void setUpDialog(LocalDOMWindow* dialog, void* handler) 337 { 338 static_cast<DialogHandler*>(handler)->dialogCreated(dialog); 339 } 340 341 void V8Window::showModalDialogMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info) 342 { 343 LocalDOMWindow* impl = V8Window::toNative(info.Holder()); 344 ExceptionState exceptionState(ExceptionState::ExecutionContext, "showModalDialog", "Window", info.Holder(), info.GetIsolate()); 345 if (!BindingSecurity::shouldAllowAccessToFrame(info.GetIsolate(), impl->frame(), exceptionState)) { 346 exceptionState.throwIfNeeded(); 347 return; 348 } 349 350 TOSTRING_VOID(V8StringResource<WithUndefinedOrNullCheck>, urlString, info[0]); 351 DialogHandler handler(info[1], ScriptState::current(info.GetIsolate())); 352 TOSTRING_VOID(V8StringResource<WithUndefinedOrNullCheck>, dialogFeaturesString, info[2]); 353 354 impl->showModalDialog(urlString, dialogFeaturesString, callingDOMWindow(info.GetIsolate()), enteredDOMWindow(info.GetIsolate()), setUpDialog, &handler); 355 356 v8SetReturnValue(info, handler.returnValue()); 357 } 358 359 void V8Window::openMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info) 360 { 361 LocalDOMWindow* impl = V8Window::toNative(info.Holder()); 362 ExceptionState exceptionState(ExceptionState::ExecutionContext, "open", "Window", info.Holder(), info.GetIsolate()); 363 if (!BindingSecurity::shouldAllowAccessToFrame(info.GetIsolate(), impl->frame(), exceptionState)) { 364 exceptionState.throwIfNeeded(); 365 return; 366 } 367 368 TOSTRING_VOID(V8StringResource<WithUndefinedOrNullCheck>, urlString, info[0]); 369 AtomicString frameName; 370 if (info[1]->IsUndefined() || info[1]->IsNull()) { 371 frameName = "_blank"; 372 } else { 373 TOSTRING_VOID(V8StringResource<>, frameNameResource, info[1]); 374 frameName = frameNameResource; 375 } 376 TOSTRING_VOID(V8StringResource<WithUndefinedOrNullCheck>, windowFeaturesString, info[2]); 377 378 RefPtrWillBeRawPtr<LocalDOMWindow> openedWindow = impl->open(urlString, frameName, windowFeaturesString, callingDOMWindow(info.GetIsolate()), enteredDOMWindow(info.GetIsolate())); 379 if (!openedWindow) 380 return; 381 382 v8SetReturnValueFast(info, openedWindow.release(), impl); 383 } 384 385 void V8Window::namedPropertyGetterCustom(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Value>& info) 386 { 387 388 LocalDOMWindow* window = V8Window::toNative(info.Holder()); 389 if (!window) 390 return; 391 392 LocalFrame* frame = window->frame(); 393 // window is detached from a frame. 394 if (!frame) 395 return; 396 397 // Search sub-frames. 398 AtomicString propName = toCoreAtomicString(name); 399 Frame* child = frame->tree().scopedChild(propName); 400 if (child) { 401 v8SetReturnValueFast(info, child->domWindow(), window); 402 return; 403 } 404 405 // Search IDL functions defined in the prototype 406 if (!info.Holder()->GetRealNamedProperty(name).IsEmpty()) 407 return; 408 409 // Search named items in the document. 410 Document* doc = frame->document(); 411 412 if (doc && doc->isHTMLDocument()) { 413 if (toHTMLDocument(doc)->hasNamedItem(propName) || doc->hasElementWithId(propName.impl())) { 414 RefPtrWillBeRawPtr<HTMLCollection> items = doc->windowNamedItems(propName); 415 if (!items->isEmpty()) { 416 if (items->hasExactlyOneItem()) { 417 v8SetReturnValueFast(info, items->item(0), window); 418 return; 419 } 420 v8SetReturnValueFast(info, items.release(), window); 421 return; 422 } 423 } 424 } 425 } 426 427 428 void V8Window::setTimeoutMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info) 429 { 430 ExceptionState exceptionState(ExceptionState::ExecutionContext, "setTimeout", "Window", info.Holder(), info.GetIsolate()); 431 windowSetTimeoutImpl(info, true, exceptionState); 432 exceptionState.throwIfNeeded(); 433 } 434 435 436 void V8Window::setIntervalMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info) 437 { 438 ExceptionState exceptionState(ExceptionState::ExecutionContext, "setInterval", "Window", info.Holder(), info.GetIsolate()); 439 windowSetTimeoutImpl(info, false, exceptionState); 440 exceptionState.throwIfNeeded(); 441 } 442 443 bool V8Window::namedSecurityCheckCustom(v8::Local<v8::Object> host, v8::Local<v8::Value> key, v8::AccessType type, v8::Local<v8::Value>) 444 { 445 v8::Isolate* isolate = v8::Isolate::GetCurrent(); 446 v8::Handle<v8::Object> window = V8Window::findInstanceInPrototypeChain(host, isolate); 447 if (window.IsEmpty()) 448 return false; // the frame is gone. 449 450 LocalDOMWindow* targetWindow = V8Window::toNative(window); 451 452 ASSERT(targetWindow); 453 454 LocalFrame* target = targetWindow->frame(); 455 if (!target) 456 return false; 457 458 // Notify the loader's client if the initial document has been accessed. 459 if (target->loader().stateMachine()->isDisplayingInitialEmptyDocument()) 460 target->loader().didAccessInitialDocument(); 461 462 if (key->IsString()) { 463 DEFINE_STATIC_LOCAL(const AtomicString, nameOfProtoProperty, ("__proto__", AtomicString::ConstructFromLiteral)); 464 465 AtomicString name = toCoreAtomicString(key.As<v8::String>()); 466 Frame* childFrame = target->tree().scopedChild(name); 467 // Notice that we can't call HasRealNamedProperty for ACCESS_HAS 468 // because that would generate infinite recursion. 469 if (type == v8::ACCESS_HAS && childFrame) 470 return true; 471 // We need to explicitly compare against nameOfProtoProperty because 472 // V8's JSObject::LocalLookup finds __proto__ before 473 // interceptors and even when __proto__ isn't a "real named property". 474 v8::Handle<v8::String> keyString = key.As<v8::String>(); 475 if (type == v8::ACCESS_GET 476 && childFrame 477 && !host->HasRealNamedProperty(keyString) 478 && !window->HasRealNamedProperty(keyString) 479 && name != nameOfProtoProperty) 480 return true; 481 } 482 483 return BindingSecurity::shouldAllowAccessToFrame(isolate, target, DoNotReportSecurityError); 484 } 485 486 bool V8Window::indexedSecurityCheckCustom(v8::Local<v8::Object> host, uint32_t index, v8::AccessType type, v8::Local<v8::Value>) 487 { 488 v8::Isolate* isolate = v8::Isolate::GetCurrent(); 489 v8::Handle<v8::Object> window = V8Window::findInstanceInPrototypeChain(host, isolate); 490 if (window.IsEmpty()) 491 return false; 492 493 LocalDOMWindow* targetWindow = V8Window::toNative(window); 494 495 ASSERT(targetWindow); 496 497 LocalFrame* target = targetWindow->frame(); 498 if (!target) 499 return false; 500 501 // Notify the loader's client if the initial document has been accessed. 502 if (target->loader().stateMachine()->isDisplayingInitialEmptyDocument()) 503 target->loader().didAccessInitialDocument(); 504 505 Frame* childFrame = target->tree().scopedChild(index); 506 507 // Notice that we can't call HasRealNamedProperty for ACCESS_HAS 508 // because that would generate infinite recursion. 509 if (type == v8::ACCESS_HAS && childFrame) 510 return true; 511 if (type == v8::ACCESS_GET 512 && childFrame 513 && !host->HasRealIndexedProperty(index) 514 && !window->HasRealIndexedProperty(index)) 515 return true; 516 517 return BindingSecurity::shouldAllowAccessToFrame(isolate, target, DoNotReportSecurityError); 518 } 519 520 v8::Handle<v8::Value> toV8(LocalDOMWindow* window, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate) 521 { 522 // Notice that we explicitly ignore creationContext because the LocalDOMWindow is its own creationContext. 523 524 if (!window) 525 return v8::Null(isolate); 526 // Initializes environment of a frame, and return the global object 527 // of the frame. 528 LocalFrame* frame = window->frame(); 529 if (!frame) 530 return v8Undefined(); 531 532 v8::Handle<v8::Context> context = toV8Context(frame, DOMWrapperWorld::current(isolate)); 533 if (context.IsEmpty()) 534 return v8Undefined(); 535 536 v8::Handle<v8::Object> global = context->Global(); 537 ASSERT(!global.IsEmpty()); 538 return global; 539 } 540 541 } // namespace WebCore 542