Simplify the way to initialize context

Source/bindings/v8/V8WindowShell.cpp

 /*
  * Copyright (C) 2008, 2009, 2011 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 76 matching lines @@
     : m_frame(frame)
     , m_world(world)
     , m_isolate(isolate)
 {
 }
 
 void V8WindowShell::disposeContext(GlobalDetachmentBehavior behavior)
 {
     m_perContextData.clear();
 
-    if (!m_contextHolder)
+    if (!m_perContextData)
         return;
 
     v8::HandleScope handleScope(m_isolate);
-    v8::Handle<v8::Context> context = m_contextHolder->context();
+    v8::Handle<v8::Context> context = m_perContextData->context();
     m_frame->loader().client()->willReleaseScriptContext(context, m_world->worldId());
 
     if (behavior == DetachGlobal)
         context->DetachGlobal();
 
-    m_contextHolder.clear();
+    m_perContextData.clear();
 
     // It's likely that disposing the context has created a lot of
     // garbage. Notify V8 about this so it'll have a chance of cleaning
     // it up when idle.
     V8GCForContextDispose::instanceTemplate().notifyContextDisposed(m_frame->isMainFrame());
 }
 
 void V8WindowShell::clearForClose(bool destroyGlobal)
 {
     if (destroyGlobal)
         m_global.clear();
 
-    if (!m_contextHolder)
+    if (!m_perContextData)
         return;
 
     m_document.clear();
     disposeContext(DoNotDetachGlobal);
 }
 
 void V8WindowShell::clearForNavigation()
 {
-    if (!m_contextHolder)
+    if (!m_perContextData)
         return;
 
     v8::HandleScope handleScope(m_isolate);
     m_document.clear();
 
-    v8::Handle<v8::Context> context = m_contextHolder->context();
+    v8::Handle<v8::Context> context = m_perContextData->context();
     v8::Context::Scope contextScope(context);
 
     // Clear the document wrapper cache before turning on access checks on
     // the old DOMWindow wrapper. This way, access to the document wrapper
     // will be protected by the security checks on the DOMWindow wrapper.
     clearDocumentProperty();
 
     v8::Handle<v8::Object> windowWrapper = V8Window::findInstanceInPrototypeChain(m_global.newLocal(m_isolate), m_isolate);
     ASSERT(!windowWrapper.IsEmpty());
     windowWrapper->TurnOnAccessCheck();
@@ skipping 30 matching lines @@
 // have its own properties. window.foo = 'x' is delegated to the
 // inner window.
 //
 // When a frame navigates to a new page, the inner window is cut off
 // the outer window, and the outer window identify is preserved for
 // the frame. However, a new inner window is created for the new page.
 // If there are JS code holds a closure to the old inner window,
 // it won't be able to reach the outer window via its global object.
 bool V8WindowShell::initializeIfNeeded()
 {
-    if (m_contextHolder)
+    if (m_perContextData)
         return true;
 
     ASSERT(!contextBeingInitialized);
     contextBeingInitialized = true;
     bool result = initialize();
     contextBeingInitialized = false;
     return result;
 }
 
 bool V8WindowShell::initialize()
 {
     TRACE_EVENT0("v8", "V8WindowShell::initialize");
     TRACE_EVENT_SCOPED_SAMPLING_STATE("Blink", "InitializeWindow");
 
     v8::HandleScope handleScope(m_isolate);
 
     createContext();
 
-    if (!m_contextHolder)
+    if (!m_perContextData)
         return false;
 
-    v8::Handle<v8::Context> context = m_contextHolder->context();
-
-    V8PerContextDataHolder::install(context, m_world.get());
-    bool isMainWorld = m_world->isMainWorld();
-
+    v8::Handle<v8::Context> context = m_perContextData->context();
     v8::Context::Scope contextScope(context);
 
     if (m_global.isEmpty()) {
         m_global.set(m_isolate, context->Global());
         if (m_global.isEmpty()) {
             disposeContext(DoNotDetachGlobal);
             return false;
         }
     }
 
-    if (!isMainWorld) {
+    if (!m_world->isMainWorld()) {
         V8WindowShell* mainWindow = m_frame->script().existingWindowShell(DOMWrapperWorld::mainWorld());
         if (mainWindow && !mainWindow->context().IsEmpty())
             setInjectedScriptContextDebugId(context, m_frame->script().contextDebugId(mainWindow->context()));
     }
 
-    m_perContextData = V8PerContextData::create(context);
-    if (!m_perContextData->init()) {
-        disposeContext(DoNotDetachGlobal);
-        return false;
-    }
     m_perContextData->setActivityLogger(V8DOMActivityLogger::activityLogger(m_world->worldId()));
     if (!installDOMWindow()) {
         disposeContext(DoNotDetachGlobal);
         return false;
     }
 
-    if (isMainWorld) {
+    if (m_world->isMainWorld()) {
         updateDocument();
         if (m_frame->document()) {
             setSecurityToken(m_frame->document()->securityOrigin());
             ContentSecurityPolicy* csp = m_frame->document()->contentSecurityPolicy();
             context->AllowCodeGenerationFromStrings(csp->allowEval(0, ContentSecurityPolicy::SuppressReport));
             context->SetErrorMessageForCodeGenerationFromStrings(v8String(m_isolate, csp->evalDisabledErrorMessage()));
         }
     } else {
         // Using the default security token means that the canAccess is always
         // called, which is slow.
@@ skipping 36 matching lines @@
     int worldId = m_world->worldId();
     for (size_t i = 0; i < extensions.size(); ++i) {
         if (!m_frame->loader().client()->allowScriptExtension(extensions[i]->name(), extensionGroup, worldId))
             continue;
 
         extensionNames[index++] = extensions[i]->name();
     }
     v8::ExtensionConfiguration extensionConfiguration(index, extensionNames.get());
 
     v8::Handle<v8::Context> context = v8::Context::New(m_isolate, &extensionConfiguration, globalTemplate, m_global.newLocal(m_isolate));
-    if (!context.IsEmpty()) {
-        m_contextHolder = adoptPtr(new gin::ContextHolder(m_isolate));
-        m_contextHolder->SetContext(context);
-    }
+    if (context.IsEmpty())
+        return;
+    m_perContextData = V8PerContextData::create(context, m_world.get());
 
     double contextCreationDurationInMilliseconds = (currentTime() - contextCreationStartInSeconds) * 1000;
     const char* histogramName = "WebCore.V8WindowShell.createContext.MainWorld";
     if (!m_world->isMainWorld())
         histogramName = "WebCore.V8WindowShell.createContext.IsolatedWorld";
     blink::Platform::current()->histogramCustomCounts(histogramName, contextCreationDurationInMilliseconds, 0, 10000, 50);
 }
 
 static v8::Handle<v8::Object> toInnerGlobalObject(v8::Handle<v8::Context> context)
 {
     return v8::Handle<v8::Object>::Cast(context->Global()->GetPrototype());
 }
 
 bool V8WindowShell::installDOMWindow()
 {
     DOMWindow* window = m_frame->domWindow();
-    v8::Local<v8::Object> windowWrapper = V8ObjectConstructor::newInstance(V8PerContextData::from(m_contextHolder->context())->constructorForType(&V8Window::wrapperTypeInfo));
+    v8::Local<v8::Object> windowWrapper = V8ObjectConstructor::newInstance(V8PerContextData::from(m_perContextData->context())->constructorForType(&V8Window::wrapperTypeInfo));
     if (windowWrapper.IsEmpty())
         return false;
 
     V8Window::installPerContextEnabledProperties(windowWrapper, window, m_isolate);
 
     V8DOMWrapper::setNativeInfo(v8::Handle<v8::Object>::Cast(windowWrapper->GetPrototype()), &V8Window::wrapperTypeInfo, window);
 
     // Install the windowWrapper as the prototype of the innerGlobalObject.
     // The full structure of the global object is as follows:
     //
     // outerGlobalObject (Empty object, remains after navigation)
     //   -- has prototype --> innerGlobalObject (Holds global variables, changes during navigation)
     //   -- has prototype --> DOMWindow instance
     //   -- has prototype --> Window.prototype
     //   -- has prototype --> Object.prototype
     //
     // Note: Much of this prototype structure is hidden from web content. The
     //       outer, inner, and DOMWindow instance all appear to be the same
     //       JavaScript object.
     //
-    v8::Handle<v8::Object> innerGlobalObject = toInnerGlobalObject(m_contextHolder->context());
+    v8::Handle<v8::Object> innerGlobalObject = toInnerGlobalObject(m_perContextData->context());
     V8DOMWrapper::setNativeInfo(innerGlobalObject, &V8Window::wrapperTypeInfo, window);
     innerGlobalObject->SetPrototype(windowWrapper);
     V8DOMWrapper::associateObjectWithWrapper<V8Window>(PassRefPtr<DOMWindow>(window), &V8Window::wrapperTypeInfo, windowWrapper, m_isolate, WrapperConfiguration::Dependent);
     return true;
 }
 
 void V8WindowShell::updateDocumentWrapper(v8::Handle<v8::Object> wrapper)
 {
     ASSERT(m_world->isMainWorld());
     m_document.set(m_isolate, wrapper);
 }
 
 void V8WindowShell::updateDocumentProperty()
 {
     if (!m_world->isMainWorld())
         return;
 
     v8::HandleScope handleScope(m_isolate);
-    v8::Handle<v8::Context> context = m_contextHolder->context();
+    v8::Handle<v8::Context> context = m_perContextData->context();
     v8::Context::Scope contextScope(context);
 
     v8::Handle<v8::Value> documentWrapper = toV8(m_frame->document(), v8::Handle<v8::Object>(), context->GetIsolate());
     ASSERT(documentWrapper == m_document.newLocal(m_isolate) || m_document.isEmpty());
     if (m_document.isEmpty())
         updateDocumentWrapper(v8::Handle<v8::Object>::Cast(documentWrapper));
     checkDocumentWrapper(m_document.newLocal(m_isolate), m_frame->document());
 
     // If instantiation of the document wrapper fails, clear the cache
     // and let the DOMWindow accessor handle access to the document.
     if (documentWrapper.IsEmpty()) {
         clearDocumentProperty();
         return;
     }
     ASSERT(documentWrapper->IsObject());
     context->Global()->ForceSet(v8AtomicString(m_isolate, "document"), documentWrapper, static_cast<v8::PropertyAttribute>(v8::ReadOnly | v8::DontDelete));
 
     // We also stash a reference to the document on the inner global object so that
     // DOMWindow objects we obtain from JavaScript references are guaranteed to have
     // live Document objects.
     setHiddenValue(m_isolate, toInnerGlobalObject(context), "document", documentWrapper);
 }
 
 void V8WindowShell::clearDocumentProperty()
 {
-    ASSERT(m_contextHolder);
+    ASSERT(m_perContextData);
     if (!m_world->isMainWorld())
         return;
     v8::HandleScope handleScope(m_isolate);
-    m_contextHolder->context()->Global()->ForceDelete(v8AtomicString(m_isolate, "document"));
+    m_perContextData->context()->Global()->ForceDelete(v8AtomicString(m_isolate, "document"));
 }
 
 void V8WindowShell::setSecurityToken(SecurityOrigin* origin)
 {
     ASSERT(m_world->isMainWorld());
     // If two tokens are equal, then the SecurityOrigins canAccess each other.
     // If two tokens are not equal, then we have to call canAccess.
     // Note: we can't use the HTTPOrigin if it was set from the DOM.
     String token;
     // We stick with an empty token if document.domain was modified or if we
     // are in the initial empty document, so that we can do a full canAccess
     // check in those cases.
     if (!origin->domainWasSetInDOM()
         && !m_frame->loader().stateMachine()->isDisplayingInitialEmptyDocument())
         token = origin->toString();
 
     // An empty or "null" token means we always have to call
     // canAccess. The toString method on securityOrigins returns the
     // string "null" for empty security origins and for security
     // origins that should only allow access to themselves. In this
     // case, we use the global object as the security token to avoid
     // calling canAccess when a script accesses its own objects.
     v8::HandleScope handleScope(m_isolate);
-    v8::Handle<v8::Context> context = m_contextHolder->context();
+    v8::Handle<v8::Context> context = m_perContextData->context();
     if (token.isEmpty() || token == "null") {
         context->UseDefaultSecurityToken();
         return;
     }
 
     CString utf8Token = token.utf8();
     // NOTE: V8 does identity comparison in fast path, must use a symbol
     // as the security token.
     context->SetSecurityToken(v8AtomicString(m_isolate, utf8Token.data(), utf8Token.length()));
 }
 
 void V8WindowShell::updateDocument()
 {
     ASSERT(m_world->isMainWorld());
     if (m_global.isEmpty())
         return;
-    if (!m_contextHolder)
+    if (!m_perContextData)
         return;
     updateDocumentProperty();
     updateSecurityOrigin(m_frame->document()->securityOrigin());
 }
 
 static v8::Handle<v8::Value> getNamedProperty(HTMLDocument* htmlDocument, const AtomicString& key, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     if (!htmlDocument->hasNamedItem(key) && !htmlDocument->hasExtraNamedItem(key))
         return v8Undefined();
 
@@ skipping 26 matching lines @@
     if (prototype->IsObject()) {
         v8SetReturnValue(info, prototype.As<v8::Object>()->Get(property));
         return;
     }
 }
 
 void V8WindowShell::namedItemAdded(HTMLDocument* document, const AtomicString& name)
 {
     ASSERT(m_world->isMainWorld());
 
-    if (!m_contextHolder)
+    if (!m_perContextData)
         return;
 
     v8::HandleScope handleScope(m_isolate);
-    v8::Context::Scope contextScope(m_contextHolder->context());
+    v8::Context::Scope contextScope(m_perContextData->context());
 
     ASSERT(!m_document.isEmpty());
     v8::Handle<v8::Object> documentHandle = m_document.newLocal(m_isolate);
     checkDocumentWrapper(documentHandle, document);
     documentHandle->SetAccessor(v8String(m_isolate, name), getter);
 }
 
 void V8WindowShell::namedItemRemoved(HTMLDocument* document, const AtomicString& name)
 {
     ASSERT(m_world->isMainWorld());
 
-    if (!m_contextHolder)
+    if (!m_perContextData)
         return;
 
     if (document->hasNamedItem(name) || document->hasExtraNamedItem(name))
         return;
 
     v8::HandleScope handleScope(m_isolate);
-    v8::Context::Scope contextScope(m_contextHolder->context());
+    v8::Context::Scope contextScope(m_perContextData->context());
 
     ASSERT(!m_document.isEmpty());
     v8::Handle<v8::Object> documentHandle = m_document.newLocal(m_isolate);
     checkDocumentWrapper(documentHandle, document);
     documentHandle->Delete(v8String(m_isolate, name));
 }
 
 void V8WindowShell::updateSecurityOrigin(SecurityOrigin* origin)
 {
     ASSERT(m_world->isMainWorld());
-    if (!m_contextHolder)
+    if (!m_perContextData)
         return;
     v8::HandleScope handleScope(m_isolate);
     setSecurityToken(origin);
 }
 
 bool V8WindowShell::contextHasCorrectPrototype(v8::Handle<v8::Context> context)
 {
     if (!isMainThread())
         return true;
     // We're initializing the context, so it is not yet in a status where we can
     // validate the context.
     if (contextBeingInitialized)
         return true;
     return !!toDOMWindow(context);
 }
 
 } // WebCore