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32 #include "bindings/v8/V8WindowShell.h"
34 #include "RuntimeEnabledFeatures.h"
35 #include "V8Document.h"
36 #include "V8HTMLCollection.h"
37 #include "V8HTMLDocument.h"
39 #include "bindings/v8/DOMWrapperWorld.h"
40 #include "bindings/v8/ScriptController.h"
41 #include "bindings/v8/V8Binding.h"
42 #include "bindings/v8/V8GCForContextDispose.h"
43 #include "bindings/v8/V8Initializer.h"
44 #include "bindings/v8/V8ObjectConstructor.h"
45 #include "bindings/v8/V8PerContextData.h"
46 #include "core/html/HTMLCollection.h"
47 #include "core/html/HTMLIFrameElement.h"
48 #include "core/inspector/InspectorInstrumentation.h"
49 #include "core/loader/DocumentLoader.h"
50 #include "core/loader/FrameLoader.h"
51 #include "core/loader/FrameLoaderClient.h"
52 #include "core/frame/ContentSecurityPolicy.h"
53 #include "core/frame/Frame.h"
54 #include "platform/TraceEvent.h"
55 #include "platform/weborigin/SecurityOrigin.h"
56 #include "public/platform/Platform.h"
57 #include "wtf/Assertions.h"
58 #include "wtf/OwnPtr.h"
59 #include "wtf/StringExtras.h"
60 #include "wtf/text/CString.h"
68 static void checkDocumentWrapper(v8::Handle<v8::Object> wrapper, Document* document)
70 ASSERT(V8Document::toNative(wrapper) == document);
71 ASSERT(!document->isHTMLDocument() || (V8Document::toNative(v8::Handle<v8::Object>::Cast(wrapper->GetPrototype())) == document));
74 static void setInjectedScriptContextDebugId(v8::Handle<v8::Context> targetContext, int debugId)
76 V8PerContextDebugData::setContextDebugData(targetContext, "injected", debugId);
79 PassOwnPtr<V8WindowShell> V8WindowShell::create(Frame* frame, PassRefPtr<DOMWrapperWorld> world, v8::Isolate* isolate)
81 return adoptPtr(new V8WindowShell(frame, world, isolate));
84 V8WindowShell::V8WindowShell(Frame* frame, PassRefPtr<DOMWrapperWorld> world, v8::Isolate* isolate)
91 void V8WindowShell::disposeContext(GlobalDetachmentBehavior behavior)
93 m_perContextData.clear();
98 v8::HandleScope handleScope(m_isolate);
99 v8::Handle<v8::Context> context = m_contextHolder->context();
100 m_frame->loader().client()->willReleaseScriptContext(context, m_world->worldId());
102 if (behavior == DetachGlobal)
103 context->DetachGlobal();
105 m_contextHolder.clear();
107 // It's likely that disposing the context has created a lot of
108 // garbage. Notify V8 about this so it'll have a chance of cleaning
110 V8GCForContextDispose::instanceTemplate().notifyContextDisposed(m_frame->isMainFrame());
113 void V8WindowShell::clearForClose(bool destroyGlobal)
118 if (!m_contextHolder)
122 disposeContext(DoNotDetachGlobal);
125 void V8WindowShell::clearForNavigation()
127 if (!m_contextHolder)
130 v8::HandleScope handleScope(m_isolate);
133 v8::Handle<v8::Context> context = m_contextHolder->context();
134 v8::Context::Scope contextScope(context);
136 // Clear the document wrapper cache before turning on access checks on
137 // the old DOMWindow wrapper. This way, access to the document wrapper
138 // will be protected by the security checks on the DOMWindow wrapper.
139 clearDocumentProperty();
141 v8::Handle<v8::Object> windowWrapper = m_global.newLocal(m_isolate)->FindInstanceInPrototypeChain(V8Window::domTemplate(m_isolate, worldTypeInMainThread(m_isolate)));
142 ASSERT(!windowWrapper.IsEmpty());
143 windowWrapper->TurnOnAccessCheck();
144 disposeContext(DetachGlobal);
147 // Create a new environment and setup the global object.
149 // The global object corresponds to a DOMWindow instance. However, to
150 // allow properties of the JS DOMWindow instance to be shadowed, we
151 // use a shadow object as the global object and use the JS DOMWindow
152 // instance as the prototype for that shadow object. The JS DOMWindow
153 // instance is undetectable from JavaScript code because the __proto__
154 // accessors skip that object.
156 // The shadow object and the DOMWindow instance are seen as one object
157 // from JavaScript. The JavaScript object that corresponds to a
158 // DOMWindow instance is the shadow object. When mapping a DOMWindow
159 // instance to a V8 object, we return the shadow object.
161 // To implement split-window, see
162 // 1) https://bugs.webkit.org/show_bug.cgi?id=17249
163 // 2) https://wiki.mozilla.org/Gecko:SplitWindow
164 // 3) https://bugzilla.mozilla.org/show_bug.cgi?id=296639
165 // we need to split the shadow object further into two objects:
166 // an outer window and an inner window. The inner window is the hidden
167 // prototype of the outer window. The inner window is the default
168 // global object of the context. A variable declared in the global
169 // scope is a property of the inner window.
171 // The outer window sticks to a Frame, it is exposed to JavaScript
172 // via window.window, window.self, window.parent, etc. The outer window
173 // has a security token which is the domain. The outer window cannot
174 // have its own properties. window.foo = 'x' is delegated to the
177 // When a frame navigates to a new page, the inner window is cut off
178 // the outer window, and the outer window identify is preserved for
179 // the frame. However, a new inner window is created for the new page.
180 // If there are JS code holds a closure to the old inner window,
181 // it won't be able to reach the outer window via its global object.
182 bool V8WindowShell::initializeIfNeeded()
187 TRACE_EVENT0("v8", "V8WindowShell::initializeIfNeeded");
188 TRACE_EVENT_SCOPED_SAMPLING_STATE("Blink", "InitializeWindow");
190 v8::HandleScope handleScope(m_isolate);
193 if (!m_contextHolder)
196 v8::Handle<v8::Context> context = m_contextHolder->context();
198 V8PerContextDataHolder::install(context);
200 m_world->setIsolatedWorldField(context);
202 bool isMainWorld = m_world->isMainWorld();
204 v8::Context::Scope contextScope(context);
206 if (m_global.isEmpty()) {
207 m_global.set(m_isolate, context->Global());
208 if (m_global.isEmpty()) {
209 disposeContext(DoNotDetachGlobal);
215 V8WindowShell* mainWindow = m_frame->script().existingWindowShell(mainThreadNormalWorld());
216 if (mainWindow && !mainWindow->context().IsEmpty())
217 setInjectedScriptContextDebugId(context, m_frame->script().contextDebugId(mainWindow->context()));
220 m_perContextData = V8PerContextData::create(context);
221 if (!m_perContextData->init()) {
222 disposeContext(DoNotDetachGlobal);
225 m_perContextData->setActivityLogger(DOMWrapperWorld::activityLogger(m_world->worldId()));
226 if (!installDOMWindow()) {
227 disposeContext(DoNotDetachGlobal);
233 if (m_frame->document()) {
234 setSecurityToken(m_frame->document()->securityOrigin());
235 ContentSecurityPolicy* csp = m_frame->document()->contentSecurityPolicy();
236 context->AllowCodeGenerationFromStrings(csp->allowEval(0, ContentSecurityPolicy::SuppressReport));
237 context->SetErrorMessageForCodeGenerationFromStrings(v8String(m_isolate, csp->evalDisabledErrorMessage()));
240 // Using the default security token means that the canAccess is always
241 // called, which is slow.
242 // FIXME: Use tokens where possible. This will mean keeping track of all
243 // created contexts so that they can all be updated when the
246 context->UseDefaultSecurityToken();
248 SecurityOrigin* origin = m_world->isolatedWorldSecurityOrigin();
249 if (origin && InspectorInstrumentation::hasFrontends()) {
250 ScriptState* scriptState = ScriptState::forContext(v8::Local<v8::Context>::New(m_isolate, context));
251 InspectorInstrumentation::didCreateIsolatedContext(m_frame, scriptState, origin);
254 m_frame->loader().client()->didCreateScriptContext(context, m_world->extensionGroup(), m_world->worldId());
258 void V8WindowShell::createContext()
260 // The documentLoader pointer could be 0 during frame shutdown.
261 // FIXME: Can we remove this check?
262 if (!m_frame->loader().documentLoader())
265 // Create a new environment using an empty template for the shadow
266 // object. Reuse the global object if one has been created earlier.
267 v8::Handle<v8::ObjectTemplate> globalTemplate = V8Window::GetShadowObjectTemplate(m_isolate, m_world->isMainWorld() ? MainWorld : IsolatedWorld);
268 if (globalTemplate.IsEmpty())
271 double contextCreationStartInSeconds = currentTime();
273 // Dynamically tell v8 about our extensions now.
274 const V8Extensions& extensions = ScriptController::registeredExtensions();
275 OwnPtr<const char*[]> extensionNames = adoptArrayPtr(new const char*[extensions.size()]);
277 int extensionGroup = m_world->extensionGroup();
278 int worldId = m_world->worldId();
279 for (size_t i = 0; i < extensions.size(); ++i) {
280 if (!m_frame->loader().client()->allowScriptExtension(extensions[i]->name(), extensionGroup, worldId))
283 extensionNames[index++] = extensions[i]->name();
285 v8::ExtensionConfiguration extensionConfiguration(index, extensionNames.get());
287 v8::HandleScope handleScope(m_isolate);
288 v8::Handle<v8::Context> context = v8::Context::New(m_isolate, &extensionConfiguration, globalTemplate, m_global.newLocal(m_isolate));
289 if (!context.IsEmpty()) {
290 m_contextHolder = adoptPtr(new gin::ContextHolder(m_isolate));
291 m_contextHolder->SetContext(context);
294 double contextCreationDurationInMilliseconds = (currentTime() - contextCreationStartInSeconds) * 1000;
295 const char* histogramName = "WebCore.V8WindowShell.createContext.MainWorld";
296 if (!m_world->isMainWorld())
297 histogramName = "WebCore.V8WindowShell.createContext.IsolatedWorld";
298 blink::Platform::current()->histogramCustomCounts(histogramName, contextCreationDurationInMilliseconds, 0, 10000, 50);
301 bool V8WindowShell::installDOMWindow()
303 DOMWrapperWorld::setInitializingWindow(true);
304 DOMWindow* window = m_frame->domWindow();
305 v8::Local<v8::Object> windowWrapper = V8ObjectConstructor::newInstance(V8PerContextData::from(m_contextHolder->context())->constructorForType(&V8Window::wrapperTypeInfo));
306 if (windowWrapper.IsEmpty())
309 V8Window::installPerContextEnabledProperties(windowWrapper, window, m_isolate);
311 V8DOMWrapper::setNativeInfo(v8::Handle<v8::Object>::Cast(windowWrapper->GetPrototype()), &V8Window::wrapperTypeInfo, window);
313 // Install the windowWrapper as the prototype of the innerGlobalObject.
314 // The full structure of the global object is as follows:
316 // outerGlobalObject (Empty object, remains after navigation)
317 // -- has prototype --> innerGlobalObject (Holds global variables, changes during navigation)
318 // -- has prototype --> DOMWindow instance
319 // -- has prototype --> Window.prototype
320 // -- has prototype --> Object.prototype
322 // Note: Much of this prototype structure is hidden from web content. The
323 // outer, inner, and DOMWindow instance all appear to be the same
324 // JavaScript object.
326 v8::Handle<v8::Object> innerGlobalObject = toInnerGlobalObject(m_contextHolder->context());
327 V8DOMWrapper::setNativeInfo(innerGlobalObject, &V8Window::wrapperTypeInfo, window);
328 innerGlobalObject->SetPrototype(windowWrapper);
329 V8DOMWrapper::associateObjectWithWrapper<V8Window>(PassRefPtr<DOMWindow>(window), &V8Window::wrapperTypeInfo, windowWrapper, m_isolate, WrapperConfiguration::Dependent);
330 DOMWrapperWorld::setInitializingWindow(false);
334 void V8WindowShell::updateDocumentWrapper(v8::Handle<v8::Object> wrapper)
336 ASSERT(m_world->isMainWorld());
337 m_document.set(m_isolate, wrapper);
340 void V8WindowShell::updateDocumentProperty()
342 if (!m_world->isMainWorld())
345 v8::HandleScope handleScope(m_isolate);
346 v8::Handle<v8::Context> context = m_contextHolder->context();
347 v8::Context::Scope contextScope(context);
349 v8::Handle<v8::Value> documentWrapper = toV8(m_frame->document(), v8::Handle<v8::Object>(), context->GetIsolate());
350 ASSERT(documentWrapper == m_document.newLocal(m_isolate) || m_document.isEmpty());
351 if (m_document.isEmpty())
352 updateDocumentWrapper(v8::Handle<v8::Object>::Cast(documentWrapper));
353 checkDocumentWrapper(m_document.newLocal(m_isolate), m_frame->document());
355 // If instantiation of the document wrapper fails, clear the cache
356 // and let the DOMWindow accessor handle access to the document.
357 if (documentWrapper.IsEmpty()) {
358 clearDocumentProperty();
361 ASSERT(documentWrapper->IsObject());
362 context->Global()->ForceSet(v8AtomicString(m_isolate, "document"), documentWrapper, static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete));
364 // We also stash a reference to the document on the inner global object so that
365 // DOMWindow objects we obtain from JavaScript references are guaranteed to have
366 // live Document objects.
367 setHiddenValue(m_isolate, toInnerGlobalObject(context), "document", documentWrapper);
370 void V8WindowShell::clearDocumentProperty()
372 ASSERT(m_contextHolder);
373 if (!m_world->isMainWorld())
375 v8::HandleScope handleScope(m_isolate);
376 m_contextHolder->context()->Global()->ForceDelete(v8AtomicString(m_isolate, "document"));
379 void V8WindowShell::setSecurityToken(SecurityOrigin* origin)
381 ASSERT(m_world->isMainWorld());
382 // If two tokens are equal, then the SecurityOrigins canAccess each other.
383 // If two tokens are not equal, then we have to call canAccess.
384 // Note: we can't use the HTTPOrigin if it was set from the DOM.
386 // We stick with an empty token if document.domain was modified or if we
387 // are in the initial empty document, so that we can do a full canAccess
388 // check in those cases.
389 if (!origin->domainWasSetInDOM()
390 && !m_frame->loader().stateMachine()->isDisplayingInitialEmptyDocument())
391 token = origin->toString();
393 // An empty or "null" token means we always have to call
394 // canAccess. The toString method on securityOrigins returns the
395 // string "null" for empty security origins and for security
396 // origins that should only allow access to themselves. In this
397 // case, we use the global object as the security token to avoid
398 // calling canAccess when a script accesses its own objects.
399 v8::HandleScope handleScope(m_isolate);
400 v8::Handle<v8::Context> context = m_contextHolder->context();
401 if (token.isEmpty() || token == "null") {
402 context->UseDefaultSecurityToken();
406 CString utf8Token = token.utf8();
407 // NOTE: V8 does identity comparison in fast path, must use a symbol
408 // as the security token.
409 context->SetSecurityToken(v8AtomicString(m_isolate, utf8Token.data(), utf8Token.length()));
412 void V8WindowShell::updateDocument()
414 ASSERT(m_world->isMainWorld());
415 if (m_global.isEmpty())
417 if (!m_contextHolder)
419 updateDocumentProperty();
420 updateSecurityOrigin(m_frame->document()->securityOrigin());
423 static v8::Handle<v8::Value> getNamedProperty(HTMLDocument* htmlDocument, const AtomicString& key, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
425 if (!htmlDocument->hasNamedItem(key) && !htmlDocument->hasExtraNamedItem(key))
426 return v8Undefined();
428 RefPtr<HTMLCollection> items = htmlDocument->documentNamedItems(key);
429 if (items->isEmpty())
430 return v8Undefined();
432 if (items->hasExactlyOneItem()) {
433 Node* node = items->item(0);
435 if (node->hasTagName(HTMLNames::iframeTag) && (frame = toHTMLIFrameElement(node)->contentFrame()))
436 return toV8(frame->domWindow(), creationContext, isolate);
437 return toV8(node, creationContext, isolate);
439 return toV8(items.release(), creationContext, isolate);
442 static void getter(v8::Local<v8::String> property, const v8::PropertyCallbackInfo<v8::Value>& info)
444 // FIXME: Consider passing StringImpl directly.
445 AtomicString name = toCoreAtomicString(property);
446 HTMLDocument* htmlDocument = V8HTMLDocument::toNative(info.Holder());
447 ASSERT(htmlDocument);
448 v8::Handle<v8::Value> result = getNamedProperty(htmlDocument, name, info.Holder(), info.GetIsolate());
449 if (!result.IsEmpty()) {
450 v8SetReturnValue(info, result);
453 v8::Handle<v8::Value> prototype = info.Holder()->GetPrototype();
454 if (prototype->IsObject()) {
455 v8SetReturnValue(info, prototype.As<v8::Object>()->Get(property));
460 void V8WindowShell::namedItemAdded(HTMLDocument* document, const AtomicString& name)
462 ASSERT(m_world->isMainWorld());
464 if (!m_contextHolder)
467 v8::HandleScope handleScope(m_isolate);
468 v8::Context::Scope contextScope(m_contextHolder->context());
470 ASSERT(!m_document.isEmpty());
471 v8::Handle<v8::Object> documentHandle = m_document.newLocal(m_isolate);
472 checkDocumentWrapper(documentHandle, document);
473 documentHandle->SetAccessor(v8String(m_isolate, name), getter);
476 void V8WindowShell::namedItemRemoved(HTMLDocument* document, const AtomicString& name)
478 ASSERT(m_world->isMainWorld());
480 if (!m_contextHolder)
483 if (document->hasNamedItem(name) || document->hasExtraNamedItem(name))
486 v8::HandleScope handleScope(m_isolate);
487 v8::Context::Scope contextScope(m_contextHolder->context());
489 ASSERT(!m_document.isEmpty());
490 v8::Handle<v8::Object> documentHandle = m_document.newLocal(m_isolate);
491 checkDocumentWrapper(documentHandle, document);
492 documentHandle->Delete(v8String(m_isolate, name));
495 void V8WindowShell::updateSecurityOrigin(SecurityOrigin* origin)
497 ASSERT(m_world->isMainWorld());
498 if (!m_contextHolder)
500 v8::HandleScope handleScope(m_isolate);
501 setSecurityToken(origin);