third_party/WebKit/Source/bindings/core/v8/LocalWindowProxy.cpp - chromium/src - Git at Google

 /*
  * 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
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "bindings/core/v8/LocalWindowProxy.h"

 #include "bindings/core/v8/ConditionalFeaturesForCore.h"
 #include "bindings/core/v8/DOMWrapperWorld.h"
 #include "bindings/core/v8/ScriptController.h"
 #include "bindings/core/v8/ToV8ForCore.h"
 #include "bindings/core/v8/V8BindingForCore.h"
 #include "bindings/core/v8/V8DOMActivityLogger.h"
 #include "bindings/core/v8/V8DOMWrapper.h"
 #include "bindings/core/v8/V8GCForContextDispose.h"
 #include "bindings/core/v8/V8HTMLDocument.h"
 #include "bindings/core/v8/V8Initializer.h"
 #include "bindings/core/v8/V8PagePopupControllerBinding.h"
 #include "bindings/core/v8/V8PrivateProperty.h"
 #include "bindings/core/v8/V8Window.h"
 #include "core/dom/Modulator.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/LocalFrameClient.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/html/DocumentNameCollection.h"
 #include "core/html/HTMLIFrameElement.h"
 #include "core/inspector/MainThreadDebugger.h"
 #include "core/loader/FrameLoader.h"
 #include "core/origin_trials/OriginTrialContext.h"
 #include "platform/Histogram.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/ScriptForbiddenScope.h"
 #include "platform/heap/Handle.h"
 #include "platform/instrumentation/tracing/TraceEvent.h"
 #include "platform/weborigin/SecurityOrigin.h"
 #include "platform/weborigin/SecurityViolationReportingPolicy.h"
 #include "platform/wtf/Assertions.h"
 #include "v8/include/v8.h"

 namespace blink {

 void LocalWindowProxy::DisposeContext(Lifecycle next_status) {
   DCHECK(next_status == Lifecycle::kGlobalObjectIsDetached ||
          next_status == Lifecycle::kFrameIsDetached);

   if (lifecycle_ != Lifecycle::kContextIsInitialized)
     return;

   ScriptState::Scope scope(script_state_.Get());
   v8::Local<v8::Context> context = script_state_->GetContext();
   // The embedder could run arbitrary code in response to the
   // willReleaseScriptContext callback, so all disposing should happen after
   // it returns.
   GetFrame()->Loader().Client()->WillReleaseScriptContext(context,
                                                           world_->GetWorldId());
   MainThreadDebugger::Instance()->ContextWillBeDestroyed(script_state_.Get());

   if (next_status == Lifecycle::kGlobalObjectIsDetached) {
     v8::Local<v8::Context> context = script_state_->GetContext();
     // Clean up state on the global proxy, which will be reused.
     if (!global_proxy_.IsEmpty()) {
       CHECK(global_proxy_ == context->Global());
       CHECK_EQ(ToScriptWrappable(context->Global()),
                ToScriptWrappable(
                    context->Global()->GetPrototype().As<v8::Object>()));
       global_proxy_.Get().SetWrapperClassId(0);
     }
     V8DOMWrapper::ClearNativeInfo(GetIsolate(), context->Global());
     script_state_->DetachGlobalObject();

 #if DCHECK_IS_ON()
     DidDetachGlobalObject();
 #endif
   }

   script_state_->DisposePerContextData();

   // 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::Instance().NotifyContextDisposed(
       GetFrame()->IsMainFrame());

   if (next_status == Lifecycle::kFrameIsDetached) {
     // The context's frame is detached from the DOM, so there shouldn't be a
     // strong reference to the context.
     global_proxy_.SetPhantom();
   }

   DCHECK_EQ(lifecycle_, Lifecycle::kContextIsInitialized);
   lifecycle_ = next_status;
 }

 void LocalWindowProxy::Initialize() {
   TRACE_EVENT1("v8", "LocalWindowProxy::initialize", "isMainWindow",
                GetFrame()->IsMainFrame());
   SCOPED_BLINK_UMA_HISTOGRAM_TIMER(
       GetFrame()->IsMainFrame()
           ? "Blink.Binding.InitializeMainLocalWindowProxy"
           : "Blink.Binding.InitializeNonMainLocalWindowProxy");

   ScriptForbiddenScope::AllowUserAgentScript allow_script;

   v8::HandleScope handle_scope(GetIsolate());

   CreateContext();

   ScriptState::Scope scope(script_state_.Get());
   v8::Local<v8::Context> context = script_state_->GetContext();
   if (global_proxy_.IsEmpty()) {
     global_proxy_.Set(GetIsolate(), context->Global());
     CHECK(!global_proxy_.IsEmpty());
   }

   SetupWindowPrototypeChain();

   SecurityOrigin* origin = 0;
   if (world_->IsMainWorld()) {
     // ActivityLogger for main world is updated within updateDocumentInternal().
     UpdateDocumentInternal();
     origin = GetFrame()->GetDocument()->GetSecurityOrigin();
     // FIXME: Can this be removed when CSP moves to browser?
     ContentSecurityPolicy* csp =
         GetFrame()->GetDocument()->GetContentSecurityPolicy();
     context->AllowCodeGenerationFromStrings(csp->AllowEval(
         0, SecurityViolationReportingPolicy::kSuppressReporting));
     context->SetErrorMessageForCodeGenerationFromStrings(
         V8String(GetIsolate(), csp->EvalDisabledErrorMessage()));
   } else {
     UpdateActivityLogger();
     origin = world_->IsolatedWorldSecurityOrigin();
     SetSecurityToken(origin);
   }

   MainThreadDebugger::Instance()->ContextCreated(script_state_.Get(),
                                                  GetFrame(), origin);
   GetFrame()->Loader().Client()->DidCreateScriptContext(context,
                                                         world_->GetWorldId());
   // If conditional features for window have been queued before the V8 context
   // was ready, then inject them into the context now
   if (world_->IsMainWorld()) {
     InstallConditionalFeaturesOnWindow(script_state_.Get());
   }

   if (world_->IsMainWorld())
     GetFrame()->Loader().DispatchDidClearWindowObjectInMainWorld();
 }

 void LocalWindowProxy::CreateContext() {
   // Create a new v8::Context with the window object as the global object
   // (aka the inner global). Reuse the outer global proxy if it already exists.
   v8::Local<v8::ObjectTemplate> global_template =
       V8Window::domTemplate(GetIsolate(), *world_)->InstanceTemplate();
   CHECK(!global_template.IsEmpty());

   Vector<const char*> extension_names;
   // Dynamically tell v8 about our extensions now.
   if (GetFrame()->Loader().Client()->AllowScriptExtensions()) {
     const V8Extensions& extensions = ScriptController::RegisteredExtensions();
     extension_names.ReserveInitialCapacity(extensions.size());
     for (const auto* extension : extensions)
       extension_names.push_back(extension->name());
   }
   v8::ExtensionConfiguration extension_configuration(extension_names.size(),
                                                      extension_names.data());

   v8::Local<v8::Context> context;
   {
     V8PerIsolateData::UseCounterDisabledScope use_counter_disabled(
         V8PerIsolateData::From(GetIsolate()));
     context =
         v8::Context::New(GetIsolate(), &extension_configuration,
                          global_template, global_proxy_.NewLocal(GetIsolate()));
   }
   CHECK(!context.IsEmpty());

 #if DCHECK_IS_ON()
   DidAttachGlobalObject();
 #endif

   script_state_ = ScriptState::Create(context, world_);

   DCHECK(lifecycle_ == Lifecycle::kContextIsUninitialized ||
          lifecycle_ == Lifecycle::kGlobalObjectIsDetached);
   lifecycle_ = Lifecycle::kContextIsInitialized;
   DCHECK(script_state_->ContextIsValid());
 }

 void LocalWindowProxy::SetupWindowPrototypeChain() {
   // Associate the window wrapper object and its prototype chain with the
   // corresponding native DOMWindow object.
   DOMWindow* window = GetFrame()->DomWindow();
   const WrapperTypeInfo* wrapper_type_info = window->GetWrapperTypeInfo();
   v8::Local<v8::Context> context = script_state_->GetContext();

   // The global proxy object.  Note this is not the global object.
   v8::Local<v8::Object> global_proxy = context->Global();
   CHECK(global_proxy_ == global_proxy);
   V8DOMWrapper::SetNativeInfo(GetIsolate(), global_proxy, wrapper_type_info,
                               window);
   // Mark the handle to be traced by Oilpan, since the global proxy has a
   // reference to the DOMWindow.
   global_proxy_.Get().SetWrapperClassId(wrapper_type_info->wrapper_class_id);

   // The global object, aka window wrapper object.
   v8::Local<v8::Object> window_wrapper =
       global_proxy->GetPrototype().As<v8::Object>();
   v8::Local<v8::Object> associated_wrapper =
       AssociateWithWrapper(window, wrapper_type_info, window_wrapper);
   DCHECK(associated_wrapper == window_wrapper);

   // The prototype object of Window interface.
   v8::Local<v8::Object> window_prototype =
       window_wrapper->GetPrototype().As<v8::Object>();
   CHECK(!window_prototype.IsEmpty());
   V8DOMWrapper::SetNativeInfo(GetIsolate(), window_prototype, wrapper_type_info,
                               window);

   // The named properties object of Window interface.
   v8::Local<v8::Object> window_properties =
       window_prototype->GetPrototype().As<v8::Object>();
   CHECK(!window_properties.IsEmpty());
   V8DOMWrapper::SetNativeInfo(GetIsolate(), window_properties,
                               wrapper_type_info, window);

   // TODO(keishi): Remove installPagePopupController and implement
   // PagePopupController in another way.
   V8PagePopupControllerBinding::InstallPagePopupController(context,
                                                            window_wrapper);
 }

 void LocalWindowProxy::UpdateDocumentProperty() {
   DCHECK(world_->IsMainWorld());

   ScriptState::Scope scope(script_state_.Get());
   v8::Local<v8::Context> context = script_state_->GetContext();
   v8::Local<v8::Value> document_wrapper =
       ToV8(GetFrame()->GetDocument(), context->Global(), GetIsolate());
   DCHECK(document_wrapper->IsObject());
   // Update the cached accessor for window.document.
   CHECK(V8PrivateProperty::GetWindowDocumentCachedAccessor(GetIsolate())
             .Set(context->Global(), document_wrapper));
 }

 void LocalWindowProxy::UpdateActivityLogger() {
   script_state_->PerContextData()->SetActivityLogger(
       V8DOMActivityLogger::ActivityLogger(
           world_->GetWorldId(), GetFrame()->GetDocument()
                                     ? GetFrame()->GetDocument()->baseURI()
                                     : KURL()));
 }

 void LocalWindowProxy::SetSecurityToken(SecurityOrigin* origin) {
   // 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;
   // If document.domain is modified, v8 needs to do a full canAccess check,
   // so always use an empty security token in that case.
   bool delay_set = world_->IsMainWorld() && origin->DomainWasSetInDOM();
   if (origin && !delay_set)
     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 handle_scope(GetIsolate());
   v8::Local<v8::Context> context = script_state_->GetContext();
   if (token.IsEmpty() || token == "null") {
     context->UseDefaultSecurityToken();
     return;
   }

   if (world_->IsIsolatedWorld()) {
     SecurityOrigin* frame_security_origin =
         GetFrame()->GetDocument()->GetSecurityOrigin();
     String frame_security_token = frame_security_origin->ToString();
     // We need to check the return value of domainWasSetInDOM() on the
     // frame's SecurityOrigin because, if that's the case, only
     // SecurityOrigin::m_domain would have been modified.
     // m_domain is not used by SecurityOrigin::toString(), so we would end
     // up generating the same token that was already set.
     if (frame_security_origin->DomainWasSetInDOM() ||
         frame_security_token.IsEmpty() || frame_security_token == "null") {
       context->UseDefaultSecurityToken();
       return;
     }
     token = frame_security_token + token;
   }

   // NOTE: V8 does identity comparison in fast path, must use a symbol
   // as the security token.
   context->SetSecurityToken(V8AtomicString(GetIsolate(), token));
 }

 void LocalWindowProxy::UpdateDocument() {
   DCHECK(world_->IsMainWorld());
   // For an uninitialized main window proxy, there's nothing we need
   // to update. The update is done when the window proxy gets initialized later.
   if (lifecycle_ == Lifecycle::kContextIsUninitialized)
     return;

   // For a navigated-away window proxy, reinitialize it as a new window with new
   // context and document.
   if (lifecycle_ == Lifecycle::kGlobalObjectIsDetached) {
     Initialize();
     DCHECK_EQ(Lifecycle::kContextIsInitialized, lifecycle_);
     // Initialization internally updates the document properties, so just
     // return afterwards.
     return;
   }

   UpdateDocumentInternal();
 }

 void LocalWindowProxy::UpdateDocumentInternal() {
   UpdateActivityLogger();
   UpdateDocumentProperty();
   UpdateSecurityOrigin(GetFrame()->GetDocument()->GetSecurityOrigin());
 }

 static v8::Local<v8::Value> GetNamedProperty(
     HTMLDocument* html_document,
     const AtomicString& key,
     v8::Local<v8::Object> creation_context,
     v8::Isolate* isolate) {
   if (!html_document->HasNamedItem(key) &&
       !html_document->HasExtraNamedItem(key))
     return V8Undefined();

   DocumentNameCollection* items = html_document->DocumentNamedItems(key);
   if (items->IsEmpty())
     return V8Undefined();

   if (items->HasExactlyOneItem()) {
     HTMLElement* element = items->Item(0);
     DCHECK(element);
     Frame* frame = isHTMLIFrameElement(*element)
                        ? toHTMLIFrameElement(*element).ContentFrame()
                        : 0;
     if (frame)
       return ToV8(frame->DomWindow(), creation_context, isolate);
     return ToV8(element, creation_context, isolate);
   }
   return ToV8(items, creation_context, isolate);
 }

 static void Getter(v8::Local<v8::Name> property,
                    const v8::PropertyCallbackInfo<v8::Value>& info) {
   if (!property->IsString())
     return;
   // FIXME: Consider passing StringImpl directly.
   AtomicString name = ToCoreAtomicString(property.As<v8::String>());
   HTMLDocument* html_document = V8HTMLDocument::toImpl(info.Holder());
   DCHECK(html_document);
   v8::Local<v8::Value> result =
       GetNamedProperty(html_document, name, info.Holder(), info.GetIsolate());
   if (!result.IsEmpty()) {
     V8SetReturnValue(info, result);
     return;
   }
   v8::Local<v8::Value> value;
   if (info.Holder()
           ->GetRealNamedPropertyInPrototypeChain(
               info.GetIsolate()->GetCurrentContext(), property.As<v8::String>())
           .ToLocal(&value))
     V8SetReturnValue(info, value);
 }

 void LocalWindowProxy::NamedItemAdded(HTMLDocument* document,
                                       const AtomicString& name) {
   DCHECK(world_->IsMainWorld());

   // Currently only contexts in attached frames can change the named items.
   // TODO(yukishiino): Support detached frame's case, too, since the spec is not
   // saying that the document needs to be attached to the DOM.
   // https://html.spec.whatwg.org/C/dom.html#dom-document-nameditem
   DCHECK(lifecycle_ == Lifecycle::kContextIsInitialized);
   // TODO(yukishiino): Remove the following if-clause due to the above DCHECK.
   if (lifecycle_ != Lifecycle::kContextIsInitialized)
     return;

   ScriptState::Scope scope(script_state_.Get());
   v8::Local<v8::Object> document_wrapper =
       world_->DomDataStore().Get(document, GetIsolate());
   document_wrapper
       ->SetAccessor(GetIsolate()->GetCurrentContext(),
                     V8String(GetIsolate(), name), Getter)
       .ToChecked();
 }

 void LocalWindowProxy::NamedItemRemoved(HTMLDocument* document,
                                         const AtomicString& name) {
   DCHECK(world_->IsMainWorld());

   // Currently only contexts in attached frames can change the named items.
   // TODO(yukishiino): Support detached frame's case, too, since the spec is not
   // saying that the document needs to be attached to the DOM.
   // https://html.spec.whatwg.org/C/dom.html#dom-document-nameditem
   DCHECK(lifecycle_ == Lifecycle::kContextIsInitialized);
   // TODO(yukishiino): Remove the following if-clause due to the above DCHECK.
   if (lifecycle_ != Lifecycle::kContextIsInitialized)
     return;

   if (document->HasNamedItem(name) || document->HasExtraNamedItem(name))
     return;
   ScriptState::Scope scope(script_state_.Get());
   v8::Local<v8::Object> document_wrapper =
       world_->DomDataStore().Get(document, GetIsolate());
   document_wrapper
       ->Delete(GetIsolate()->GetCurrentContext(), V8String(GetIsolate(), name))
       .ToChecked();
 }

 void LocalWindowProxy::UpdateSecurityOrigin(SecurityOrigin* origin) {
   // For an uninitialized window proxy, there's nothing we need to update. The
   // update is done when the window proxy gets initialized later.
   if (lifecycle_ == Lifecycle::kContextIsUninitialized ||
       lifecycle_ == Lifecycle::kGlobalObjectIsDetached)
     return;

   SetSecurityToken(origin);
 }

 LocalWindowProxy::LocalWindowProxy(v8::Isolate* isolate,
                                    LocalFrame& frame,
                                    RefPtr<DOMWrapperWorld> world)
     : WindowProxy(isolate, frame, std::move(world)) {}

 }  // namespace blink
	/*
	* 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
	* copyright notice, this list of conditions and the following disclaimer
	* in the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name of Google Inc. nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "bindings/core/v8/LocalWindowProxy.h"

	#include "bindings/core/v8/ConditionalFeaturesForCore.h"
	#include "bindings/core/v8/DOMWrapperWorld.h"
	#include "bindings/core/v8/ScriptController.h"
	#include "bindings/core/v8/ToV8ForCore.h"
	#include "bindings/core/v8/V8BindingForCore.h"
	#include "bindings/core/v8/V8DOMActivityLogger.h"
	#include "bindings/core/v8/V8DOMWrapper.h"
	#include "bindings/core/v8/V8GCForContextDispose.h"
	#include "bindings/core/v8/V8HTMLDocument.h"
	#include "bindings/core/v8/V8Initializer.h"
	#include "bindings/core/v8/V8PagePopupControllerBinding.h"
	#include "bindings/core/v8/V8PrivateProperty.h"
	#include "bindings/core/v8/V8Window.h"
	#include "core/dom/Modulator.h"
	#include "core/frame/LocalFrame.h"
	#include "core/frame/LocalFrameClient.h"
	#include "core/frame/csp/ContentSecurityPolicy.h"
	#include "core/html/DocumentNameCollection.h"
	#include "core/html/HTMLIFrameElement.h"
	#include "core/inspector/MainThreadDebugger.h"
	#include "core/loader/FrameLoader.h"
	#include "core/origin_trials/OriginTrialContext.h"
	#include "platform/Histogram.h"
	#include "platform/RuntimeEnabledFeatures.h"
	#include "platform/ScriptForbiddenScope.h"
	#include "platform/heap/Handle.h"
	#include "platform/instrumentation/tracing/TraceEvent.h"
	#include "platform/weborigin/SecurityOrigin.h"
	#include "platform/weborigin/SecurityViolationReportingPolicy.h"
	#include "platform/wtf/Assertions.h"
	#include "v8/include/v8.h"

	namespace blink {

	void LocalWindowProxy::DisposeContext(Lifecycle next_status) {
	DCHECK(next_status == Lifecycle::kGlobalObjectIsDetached \|\|
	next_status == Lifecycle::kFrameIsDetached);

	if (lifecycle_ != Lifecycle::kContextIsInitialized)
	return;

	ScriptState::Scope scope(script_state_.Get());
	v8::Local<v8::Context> context = script_state_->GetContext();
	// The embedder could run arbitrary code in response to the
	// willReleaseScriptContext callback, so all disposing should happen after
	// it returns.
	GetFrame()->Loader().Client()->WillReleaseScriptContext(context,
	world_->GetWorldId());
	MainThreadDebugger::Instance()->ContextWillBeDestroyed(script_state_.Get());

	if (next_status == Lifecycle::kGlobalObjectIsDetached) {
	v8::Local<v8::Context> context = script_state_->GetContext();
	// Clean up state on the global proxy, which will be reused.
	if (!global_proxy_.IsEmpty()) {
	CHECK(global_proxy_ == context->Global());
	CHECK_EQ(ToScriptWrappable(context->Global()),
	ToScriptWrappable(
	context->Global()->GetPrototype().As<v8::Object>()));
	global_proxy_.Get().SetWrapperClassId(0);
	}
	V8DOMWrapper::ClearNativeInfo(GetIsolate(), context->Global());
	script_state_->DetachGlobalObject();

	#if DCHECK_IS_ON()
	DidDetachGlobalObject();
	#endif
	}

	script_state_->DisposePerContextData();

	// 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::Instance().NotifyContextDisposed(
	GetFrame()->IsMainFrame());

	if (next_status == Lifecycle::kFrameIsDetached) {
	// The context's frame is detached from the DOM, so there shouldn't be a
	// strong reference to the context.
	global_proxy_.SetPhantom();
	}

	DCHECK_EQ(lifecycle_, Lifecycle::kContextIsInitialized);
	lifecycle_ = next_status;
	}

	void LocalWindowProxy::Initialize() {
	TRACE_EVENT1("v8", "LocalWindowProxy::initialize", "isMainWindow",
	GetFrame()->IsMainFrame());
	SCOPED_BLINK_UMA_HISTOGRAM_TIMER(
	GetFrame()->IsMainFrame()
	? "Blink.Binding.InitializeMainLocalWindowProxy"
	: "Blink.Binding.InitializeNonMainLocalWindowProxy");

	ScriptForbiddenScope::AllowUserAgentScript allow_script;

	v8::HandleScope handle_scope(GetIsolate());

	CreateContext();

	ScriptState::Scope scope(script_state_.Get());
	v8::Local<v8::Context> context = script_state_->GetContext();
	if (global_proxy_.IsEmpty()) {
	global_proxy_.Set(GetIsolate(), context->Global());
	CHECK(!global_proxy_.IsEmpty());
	}

	SetupWindowPrototypeChain();

	SecurityOrigin* origin = 0;
	if (world_->IsMainWorld()) {
	// ActivityLogger for main world is updated within updateDocumentInternal().
	UpdateDocumentInternal();
	origin = GetFrame()->GetDocument()->GetSecurityOrigin();
	// FIXME: Can this be removed when CSP moves to browser?
	ContentSecurityPolicy* csp =
	GetFrame()->GetDocument()->GetContentSecurityPolicy();
	context->AllowCodeGenerationFromStrings(csp->AllowEval(
	0, SecurityViolationReportingPolicy::kSuppressReporting));
	context->SetErrorMessageForCodeGenerationFromStrings(
	V8String(GetIsolate(), csp->EvalDisabledErrorMessage()));
	} else {
	UpdateActivityLogger();
	origin = world_->IsolatedWorldSecurityOrigin();
	SetSecurityToken(origin);
	}

	MainThreadDebugger::Instance()->ContextCreated(script_state_.Get(),
	GetFrame(), origin);
	GetFrame()->Loader().Client()->DidCreateScriptContext(context,
	world_->GetWorldId());
	// If conditional features for window have been queued before the V8 context
	// was ready, then inject them into the context now
	if (world_->IsMainWorld()) {
	InstallConditionalFeaturesOnWindow(script_state_.Get());
	}

	if (world_->IsMainWorld())
	GetFrame()->Loader().DispatchDidClearWindowObjectInMainWorld();
	}

	void LocalWindowProxy::CreateContext() {
	// Create a new v8::Context with the window object as the global object
	// (aka the inner global). Reuse the outer global proxy if it already exists.
	v8::Local<v8::ObjectTemplate> global_template =
	V8Window::domTemplate(GetIsolate(), *world_)->InstanceTemplate();
	CHECK(!global_template.IsEmpty());

	Vector<const char*> extension_names;
	// Dynamically tell v8 about our extensions now.
	if (GetFrame()->Loader().Client()->AllowScriptExtensions()) {
	const V8Extensions& extensions = ScriptController::RegisteredExtensions();
	extension_names.ReserveInitialCapacity(extensions.size());
	for (const auto* extension : extensions)
	extension_names.push_back(extension->name());
	}
	v8::ExtensionConfiguration extension_configuration(extension_names.size(),
	extension_names.data());

	v8::Local<v8::Context> context;
	{
	V8PerIsolateData::UseCounterDisabledScope use_counter_disabled(
	V8PerIsolateData::From(GetIsolate()));
	context =
	v8::Context::New(GetIsolate(), &extension_configuration,
	global_template, global_proxy_.NewLocal(GetIsolate()));
	}
	CHECK(!context.IsEmpty());

	#if DCHECK_IS_ON()
	DidAttachGlobalObject();
	#endif

	script_state_ = ScriptState::Create(context, world_);

	DCHECK(lifecycle_ == Lifecycle::kContextIsUninitialized \|\|
	lifecycle_ == Lifecycle::kGlobalObjectIsDetached);
	lifecycle_ = Lifecycle::kContextIsInitialized;
	DCHECK(script_state_->ContextIsValid());
	}

	void LocalWindowProxy::SetupWindowPrototypeChain() {
	// Associate the window wrapper object and its prototype chain with the
	// corresponding native DOMWindow object.
	DOMWindow* window = GetFrame()->DomWindow();
	const WrapperTypeInfo* wrapper_type_info = window->GetWrapperTypeInfo();
	v8::Local<v8::Context> context = script_state_->GetContext();

	// The global proxy object. Note this is not the global object.
	v8::Local<v8::Object> global_proxy = context->Global();
	CHECK(global_proxy_ == global_proxy);
	V8DOMWrapper::SetNativeInfo(GetIsolate(), global_proxy, wrapper_type_info,
	window);
	// Mark the handle to be traced by Oilpan, since the global proxy has a
	// reference to the DOMWindow.
	global_proxy_.Get().SetWrapperClassId(wrapper_type_info->wrapper_class_id);

	// The global object, aka window wrapper object.
	v8::Local<v8::Object> window_wrapper =
	global_proxy->GetPrototype().As<v8::Object>();
	v8::Local<v8::Object> associated_wrapper =
	AssociateWithWrapper(window, wrapper_type_info, window_wrapper);
	DCHECK(associated_wrapper == window_wrapper);

	// The prototype object of Window interface.
	v8::Local<v8::Object> window_prototype =
	window_wrapper->GetPrototype().As<v8::Object>();
	CHECK(!window_prototype.IsEmpty());
	V8DOMWrapper::SetNativeInfo(GetIsolate(), window_prototype, wrapper_type_info,
	window);

	// The named properties object of Window interface.
	v8::Local<v8::Object> window_properties =
	window_prototype->GetPrototype().As<v8::Object>();
	CHECK(!window_properties.IsEmpty());
	V8DOMWrapper::SetNativeInfo(GetIsolate(), window_properties,
	wrapper_type_info, window);

	// TODO(keishi): Remove installPagePopupController and implement
	// PagePopupController in another way.
	V8PagePopupControllerBinding::InstallPagePopupController(context,
	window_wrapper);
	}

	void LocalWindowProxy::UpdateDocumentProperty() {
	DCHECK(world_->IsMainWorld());

	ScriptState::Scope scope(script_state_.Get());
	v8::Local<v8::Context> context = script_state_->GetContext();
	v8::Local<v8::Value> document_wrapper =
	ToV8(GetFrame()->GetDocument(), context->Global(), GetIsolate());
	DCHECK(document_wrapper->IsObject());
	// Update the cached accessor for window.document.
	CHECK(V8PrivateProperty::GetWindowDocumentCachedAccessor(GetIsolate())
	.Set(context->Global(), document_wrapper));
	}

	void LocalWindowProxy::UpdateActivityLogger() {
	script_state_->PerContextData()->SetActivityLogger(
	V8DOMActivityLogger::ActivityLogger(
	world_->GetWorldId(), GetFrame()->GetDocument()
	? GetFrame()->GetDocument()->baseURI()
	: KURL()));
	}

	void LocalWindowProxy::SetSecurityToken(SecurityOrigin* origin) {
	// 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;
	// If document.domain is modified, v8 needs to do a full canAccess check,
	// so always use an empty security token in that case.
	bool delay_set = world_->IsMainWorld() && origin->DomainWasSetInDOM();
	if (origin && !delay_set)
	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 handle_scope(GetIsolate());
	v8::Local<v8::Context> context = script_state_->GetContext();
	if (token.IsEmpty() \|\| token == "null") {
	context->UseDefaultSecurityToken();
	return;
	}

	if (world_->IsIsolatedWorld()) {
	SecurityOrigin* frame_security_origin =
	GetFrame()->GetDocument()->GetSecurityOrigin();
	String frame_security_token = frame_security_origin->ToString();
	// We need to check the return value of domainWasSetInDOM() on the
	// frame's SecurityOrigin because, if that's the case, only
	// SecurityOrigin::m_domain would have been modified.
	// m_domain is not used by SecurityOrigin::toString(), so we would end
	// up generating the same token that was already set.
	if (frame_security_origin->DomainWasSetInDOM() \|\|
	frame_security_token.IsEmpty() \|\| frame_security_token == "null") {
	context->UseDefaultSecurityToken();
	return;
	}
	token = frame_security_token + token;
	}

	// NOTE: V8 does identity comparison in fast path, must use a symbol
	// as the security token.
	context->SetSecurityToken(V8AtomicString(GetIsolate(), token));
	}

	void LocalWindowProxy::UpdateDocument() {
	DCHECK(world_->IsMainWorld());
	// For an uninitialized main window proxy, there's nothing we need
	// to update. The update is done when the window proxy gets initialized later.
	if (lifecycle_ == Lifecycle::kContextIsUninitialized)
	return;

	// For a navigated-away window proxy, reinitialize it as a new window with new
	// context and document.
	if (lifecycle_ == Lifecycle::kGlobalObjectIsDetached) {
	Initialize();
	DCHECK_EQ(Lifecycle::kContextIsInitialized, lifecycle_);
	// Initialization internally updates the document properties, so just
	// return afterwards.
	return;
	}

	UpdateDocumentInternal();
	}

	void LocalWindowProxy::UpdateDocumentInternal() {
	UpdateActivityLogger();
	UpdateDocumentProperty();
	UpdateSecurityOrigin(GetFrame()->GetDocument()->GetSecurityOrigin());
	}

	static v8::Local<v8::Value> GetNamedProperty(
	HTMLDocument* html_document,
	const AtomicString& key,
	v8::Local<v8::Object> creation_context,
	v8::Isolate* isolate) {
	if (!html_document->HasNamedItem(key) &&
	!html_document->HasExtraNamedItem(key))
	return V8Undefined();

	DocumentNameCollection* items = html_document->DocumentNamedItems(key);
	if (items->IsEmpty())
	return V8Undefined();

	if (items->HasExactlyOneItem()) {
	HTMLElement* element = items->Item(0);
	DCHECK(element);
	Frame* frame = isHTMLIFrameElement(*element)
	? toHTMLIFrameElement(*element).ContentFrame()
	: 0;
	if (frame)
	return ToV8(frame->DomWindow(), creation_context, isolate);
	return ToV8(element, creation_context, isolate);
	}
	return ToV8(items, creation_context, isolate);
	}

	static void Getter(v8::Local<v8::Name> property,
	const v8::PropertyCallbackInfo<v8::Value>& info) {
	if (!property->IsString())
	return;
	// FIXME: Consider passing StringImpl directly.
	AtomicString name = ToCoreAtomicString(property.As<v8::String>());
	HTMLDocument* html_document = V8HTMLDocument::toImpl(info.Holder());
	DCHECK(html_document);
	v8::Local<v8::Value> result =
	GetNamedProperty(html_document, name, info.Holder(), info.GetIsolate());
	if (!result.IsEmpty()) {
	V8SetReturnValue(info, result);
	return;
	}
	v8::Local<v8::Value> value;
	if (info.Holder()
	->GetRealNamedPropertyInPrototypeChain(
	info.GetIsolate()->GetCurrentContext(), property.As<v8::String>())
	.ToLocal(&value))
	V8SetReturnValue(info, value);
	}

	void LocalWindowProxy::NamedItemAdded(HTMLDocument* document,
	const AtomicString& name) {
	DCHECK(world_->IsMainWorld());

	// Currently only contexts in attached frames can change the named items.
	// TODO(yukishiino): Support detached frame's case, too, since the spec is not
	// saying that the document needs to be attached to the DOM.
	// https://html.spec.whatwg.org/C/dom.html#dom-document-nameditem
	DCHECK(lifecycle_ == Lifecycle::kContextIsInitialized);
	// TODO(yukishiino): Remove the following if-clause due to the above DCHECK.
	if (lifecycle_ != Lifecycle::kContextIsInitialized)
	return;

	ScriptState::Scope scope(script_state_.Get());
	v8::Local<v8::Object> document_wrapper =
	world_->DomDataStore().Get(document, GetIsolate());
	document_wrapper
	->SetAccessor(GetIsolate()->GetCurrentContext(),
	V8String(GetIsolate(), name), Getter)
	.ToChecked();
	}

	void LocalWindowProxy::NamedItemRemoved(HTMLDocument* document,
	const AtomicString& name) {
	DCHECK(world_->IsMainWorld());

	// Currently only contexts in attached frames can change the named items.
	// TODO(yukishiino): Support detached frame's case, too, since the spec is not
	// saying that the document needs to be attached to the DOM.
	// https://html.spec.whatwg.org/C/dom.html#dom-document-nameditem
	DCHECK(lifecycle_ == Lifecycle::kContextIsInitialized);
	// TODO(yukishiino): Remove the following if-clause due to the above DCHECK.
	if (lifecycle_ != Lifecycle::kContextIsInitialized)
	return;

	if (document->HasNamedItem(name) \|\| document->HasExtraNamedItem(name))
	return;
	ScriptState::Scope scope(script_state_.Get());
	v8::Local<v8::Object> document_wrapper =
	world_->DomDataStore().Get(document, GetIsolate());
	document_wrapper
	->Delete(GetIsolate()->GetCurrentContext(), V8String(GetIsolate(), name))
	.ToChecked();
	}

	void LocalWindowProxy::UpdateSecurityOrigin(SecurityOrigin* origin) {
	// For an uninitialized window proxy, there's nothing we need to update. The
	// update is done when the window proxy gets initialized later.
	if (lifecycle_ == Lifecycle::kContextIsUninitialized \|\|
	lifecycle_ == Lifecycle::kGlobalObjectIsDetached)
	return;

	SetSecurityToken(origin);
	}

	LocalWindowProxy::LocalWindowProxy(v8::Isolate* isolate,
	LocalFrame& frame,
	RefPtr<DOMWrapperWorld> world)
	: WindowProxy(isolate, frame, std::move(world)) {}

	} // namespace blink