diff -r 000000000000 -r 4f2f89ce4247 WebCore/bindings/v8/V8Proxy.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/bindings/v8/V8Proxy.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,888 @@
+/*
+ * Copyright (C) 2008, 2009 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 "config.h"
+#include "V8Proxy.h"
+
+#include "CSSMutableStyleDeclaration.h"
+#include "CachedMetadata.h"
+#include "DateExtension.h"
+#include "DocumentLoader.h"
+#include "Frame.h"
+#include "FrameLoaderClient.h"
+#include "InspectorTimelineAgent.h"
+#include "Page.h"
+#include "PageGroup.h"
+#include "PlatformBridge.h"
+#include "SVGElement.h"
+#include "ScriptController.h"
+#include "Settings.h"
+#include "StorageNamespace.h"
+#include "V8Binding.h"
+#include "V8BindingState.h"
+#include "V8Collection.h"
+#include "V8ConsoleMessage.h"
+#include "V8DOMCoreException.h"
+#include "V8DOMMap.h"
+#include "V8DOMWindow.h"
+#include "V8EventException.h"
+#include "V8HiddenPropertyName.h"
+#include "V8IsolatedContext.h"
+#include "V8RangeException.h"
+#include "V8SQLException.h"
+#include "V8XMLHttpRequestException.h"
+#include "V8XPathException.h"
+#include "WorkerContext.h"
+#include "WorkerContextExecutionProxy.h"
+
+#if ENABLE(SVG)
+#include "V8SVGException.h"
+#endif
+
+#include <algorithm>
+#include <stdio.h>
+#include <utility>
+#include <wtf/Assertions.h>
+#include <wtf/OwnArrayPtr.h>
+#include <wtf/OwnPtr.h>
+#include <wtf/StdLibExtras.h>
+#include <wtf/StringExtras.h>
+#include <wtf/UnusedParam.h>
+
+namespace WebCore {
+
+// Static list of registered extensions
+V8Extensions V8Proxy::m_extensions;
+
+void batchConfigureAttributes(v8::Handle<v8::ObjectTemplate> instance, 
+                              v8::Handle<v8::ObjectTemplate> proto, 
+                              const BatchedAttribute* attributes, 
+                              size_t attributeCount)
+{
+    for (size_t i = 0; i < attributeCount; ++i)
+        configureAttribute(instance, proto, attributes[i]);
+}
+
+void batchConfigureCallbacks(v8::Handle<v8::ObjectTemplate> proto, 
+                             v8::Handle<v8::Signature> signature, 
+                             v8::PropertyAttribute attributes,
+                             const BatchedCallback* callbacks,
+                             size_t callbackCount)
+{
+    for (size_t i = 0; i < callbackCount; ++i) {
+        proto->Set(v8::String::New(callbacks[i].name),
+                   v8::FunctionTemplate::New(callbacks[i].callback, 
+                                             v8::Handle<v8::Value>(),
+                                             signature),
+                   attributes);
+    }
+}
+
+void batchConfigureConstants(v8::Handle<v8::FunctionTemplate> functionDescriptor,
+                             v8::Handle<v8::ObjectTemplate> proto,
+                             const BatchedConstant* constants,
+                             size_t constantCount)
+{
+    for (size_t i = 0; i < constantCount; ++i) {
+        const BatchedConstant* constant = &constants[i];
+        functionDescriptor->Set(v8::String::New(constant->name), v8::Integer::New(constant->value), v8::ReadOnly);
+        proto->Set(v8::String::New(constant->name), v8::Integer::New(constant->value), v8::ReadOnly);
+    }
+}
+
+typedef HashMap<Node*, v8::Object*> DOMNodeMap;
+typedef HashMap<void*, v8::Object*> DOMObjectMap;
+
+#if ENABLE(SVG)
+// Map of SVG objects with contexts to their contexts
+static HashMap<void*, SVGElement*>& svgObjectToContextMap()
+{
+    typedef HashMap<void*, SVGElement*> SvgObjectToContextMap;
+    DEFINE_STATIC_LOCAL(SvgObjectToContextMap, staticSvgObjectToContextMap, ());
+    return staticSvgObjectToContextMap;
+}
+
+void V8Proxy::setSVGContext(void* object, SVGElement* context)
+{
+    if (!object)
+        return;
+
+    SVGElement* oldContext = svgObjectToContextMap().get(object);
+
+    if (oldContext == context)
+        return;
+
+    if (oldContext)
+        oldContext->deref();
+
+    if (context)
+        context->ref();
+
+    svgObjectToContextMap().set(object, context);
+}
+
+SVGElement* V8Proxy::svgContext(void* object)
+{
+    return svgObjectToContextMap().get(object);
+}
+
+#endif
+
+typedef HashMap<int, v8::FunctionTemplate*> FunctionTemplateMap;
+
+bool AllowAllocation::m_current = false;
+
+void logInfo(Frame* frame, const String& message, const String& url)
+{
+    Page* page = frame->page();
+    if (!page)
+        return;
+    V8ConsoleMessage consoleMessage(message, url, 0);
+    consoleMessage.dispatchNow(page);
+}
+
+enum DelayReporting {
+    ReportLater,
+    ReportNow
+};
+
+void V8Proxy::reportUnsafeAccessTo(Frame* target, DelayReporting delay)
+{
+    ASSERT(target);
+    Document* targetDocument = target->document();
+    if (!targetDocument)
+        return;
+
+    Frame* source = V8Proxy::retrieveFrameForEnteredContext();
+    if (!source || !source->document())
+        return; // Ignore error if the source document is gone.
+
+    Document* sourceDocument = source->document();
+
+    // FIXME: This error message should contain more specifics of why the same
+    // origin check has failed.
+    String str = String::format("Unsafe JavaScript attempt to access frame "
+                                "with URL %s from frame with URL %s. "
+                                "Domains, protocols and ports must match.\n",
+                                targetDocument->url().string().utf8().data(),
+                                sourceDocument->url().string().utf8().data());
+
+    // Build a console message with fake source ID and line number.
+    const String kSourceID = "";
+    const int kLineNumber = 1;
+    V8ConsoleMessage message(str, kSourceID, kLineNumber);
+
+    if (delay == ReportNow) {
+        // NOTE: Safari prints the message in the target page, but it seems like
+        // it should be in the source page. Even for delayed messages, we put it in
+        // the source page; see V8ConsoleMessage::processDelayed().
+        message.dispatchNow(source->page());
+    } else {
+        ASSERT(delay == ReportLater);
+        // We cannot safely report the message eagerly, because this may cause
+        // allocations and GCs internally in V8 and we cannot handle that at this
+        // point. Therefore we delay the reporting.
+        message.dispatchLater();
+    }
+}
+
+static void handleFatalErrorInV8()
+{
+    // FIXME: We temporarily deal with V8 internal error situations
+    // such as out-of-memory by crashing the renderer.
+    CRASH();
+}
+
+V8Proxy::V8Proxy(Frame* frame)
+    : m_frame(frame)
+    , m_windowShell(V8DOMWindowShell::create(frame))
+    , m_inlineCode(false)
+    , m_timerCallback(false)
+    , m_recursion(0)
+{
+}
+
+V8Proxy::~V8Proxy()
+{
+    clearForClose();
+    windowShell()->destroyGlobal();
+}
+
+v8::Handle<v8::Script> V8Proxy::compileScript(v8::Handle<v8::String> code, const String& fileName, int baseLine, v8::ScriptData* scriptData)
+{
+    const uint16_t* fileNameString = fromWebCoreString(fileName);
+    v8::Handle<v8::String> name = v8::String::New(fileNameString, fileName.length());
+    v8::Handle<v8::Integer> line = v8::Integer::New(baseLine);
+    v8::ScriptOrigin origin(name, line);
+    v8::Handle<v8::Script> script = v8::Script::Compile(code, &origin, scriptData);
+    return script;
+}
+
+bool V8Proxy::handleOutOfMemory()
+{
+    v8::Local<v8::Context> context = v8::Context::GetCurrent();
+
+    if (!context->HasOutOfMemoryException())
+        return false;
+
+    // Warning, error, disable JS for this frame?
+    Frame* frame = V8Proxy::retrieveFrame(context);
+
+    V8Proxy* proxy = V8Proxy::retrieve(frame);
+    if (proxy) {
+        // Clean m_context, and event handlers.
+        proxy->clearForClose();
+
+        proxy->windowShell()->destroyGlobal();
+    }
+
+#if PLATFORM(CHROMIUM)
+    PlatformBridge::notifyJSOutOfMemory(frame);
+#endif
+
+    // Disable JS.
+    Settings* settings = frame->settings();
+    ASSERT(settings);
+    settings->setJavaScriptEnabled(false);
+
+    return true;
+}
+
+void V8Proxy::evaluateInIsolatedWorld(int worldID, const Vector<ScriptSourceCode>& sources, int extensionGroup)
+{
+    // FIXME: This will need to get reorganized once we have a windowShell for the isolated world.
+    windowShell()->initContextIfNeeded();
+
+    v8::HandleScope handleScope;
+    V8IsolatedContext* isolatedContext = 0;
+
+    if (worldID > 0) {
+        IsolatedWorldMap::iterator iter = m_isolatedWorlds.find(worldID);
+        if (iter != m_isolatedWorlds.end()) {
+            isolatedContext = iter->second;
+        } else {
+            isolatedContext = new V8IsolatedContext(this, extensionGroup);
+            if (isolatedContext->context().IsEmpty()) {
+                delete isolatedContext;
+                return;
+            }
+
+            // FIXME: We should change this to using window shells to match JSC.
+            m_isolatedWorlds.set(worldID, isolatedContext);
+
+            // Setup context id for JS debugger.
+            if (!setInjectedScriptContextDebugId(isolatedContext->context())) {
+                m_isolatedWorlds.take(worldID);
+                delete isolatedContext;
+                return;
+            }
+        }
+    } else {
+        isolatedContext = new V8IsolatedContext(this, extensionGroup);
+        if (isolatedContext->context().IsEmpty()) {
+            delete isolatedContext;
+            return;
+        }
+    }
+
+    v8::Local<v8::Context> context = v8::Local<v8::Context>::New(isolatedContext->context());
+    v8::Context::Scope context_scope(context);
+    for (size_t i = 0; i < sources.size(); ++i)
+      evaluate(sources[i], 0);
+
+    if (worldID == 0)
+      isolatedContext->destroy();
+}
+
+bool V8Proxy::setInjectedScriptContextDebugId(v8::Handle<v8::Context> targetContext)
+{
+    // Setup context id for JS debugger.
+    v8::Context::Scope contextScope(targetContext);
+    v8::Handle<v8::Context> context = windowShell()->context();
+    if (context.IsEmpty())
+        return false;
+    int debugId = contextDebugId(context);
+
+    char buffer[32];
+    if (debugId == -1)
+        snprintf(buffer, sizeof(buffer), "injected");
+    else
+        snprintf(buffer, sizeof(buffer), "injected,%d", debugId);
+    targetContext->SetData(v8::String::New(buffer));
+
+    return true;
+}
+
+PassOwnPtr<v8::ScriptData> V8Proxy::precompileScript(v8::Handle<v8::String> code, CachedScript* cachedScript)
+{
+    // A pseudo-randomly chosen ID used to store and retrieve V8 ScriptData from
+    // the CachedScript. If the format changes, this ID should be changed too.
+    static const unsigned dataTypeID = 0xECC13BD7;
+
+    // Very small scripts are not worth the effort to preparse.
+    static const int minPreparseLength = 1024;
+
+    if (!cachedScript || code->Length() < minPreparseLength)
+        return 0;
+
+    CachedMetadata* cachedMetadata = cachedScript->cachedMetadata(dataTypeID);
+    if (cachedMetadata)
+        return v8::ScriptData::New(cachedMetadata->data(), cachedMetadata->size());
+
+    OwnPtr<v8::ScriptData> scriptData(v8::ScriptData::PreCompile(code));
+    cachedScript->setCachedMetadata(dataTypeID, scriptData->Data(), scriptData->Length());
+
+    return scriptData.release();
+}
+
+bool V8Proxy::executingScript() const
+{
+    return m_recursion;
+}
+
+v8::Local<v8::Value> V8Proxy::evaluate(const ScriptSourceCode& source, Node* node)
+{
+    ASSERT(v8::Context::InContext());
+
+    V8GCController::checkMemoryUsage();
+
+#if ENABLE(INSPECTOR)
+    if (InspectorTimelineAgent* timelineAgent = m_frame->page() ? m_frame->page()->inspectorTimelineAgent() : 0)
+        timelineAgent->willEvaluateScript(source.url().isNull() ? String() : source.url().string(), source.startLine());
+#endif
+
+    v8::Local<v8::Value> result;
+    {
+        // Isolate exceptions that occur when compiling and executing
+        // the code. These exceptions should not interfere with
+        // javascript code we might evaluate from C++ when returning
+        // from here.
+        v8::TryCatch tryCatch;
+        tryCatch.SetVerbose(true);
+
+        // Compile the script.
+        v8::Local<v8::String> code = v8ExternalString(source.source());
+#if PLATFORM(CHROMIUM)
+        PlatformBridge::traceEventBegin("v8.compile", node, "");
+#endif
+        OwnPtr<v8::ScriptData> scriptData = precompileScript(code, source.cachedScript());
+
+        // NOTE: For compatibility with WebCore, ScriptSourceCode's line starts at
+        // 1, whereas v8 starts at 0.
+        v8::Handle<v8::Script> script = compileScript(code, source.url(), source.startLine() - 1, scriptData.get());
+#if PLATFORM(CHROMIUM)
+        PlatformBridge::traceEventEnd("v8.compile", node, "");
+
+        PlatformBridge::traceEventBegin("v8.run", node, "");
+#endif
+        // Set inlineCode to true for <a href="javascript:doSomething()">
+        // and false for <script>doSomething</script>. We make a rough guess at
+        // this based on whether the script source has a URL.
+        result = runScript(script, source.url().string().isNull());
+    }
+#if PLATFORM(CHROMIUM)
+    PlatformBridge::traceEventEnd("v8.run", node, "");
+#endif
+
+#if ENABLE(INSPECTOR)
+    if (InspectorTimelineAgent* timelineAgent = m_frame->page() ? m_frame->page()->inspectorTimelineAgent() : 0)
+        timelineAgent->didEvaluateScript();
+#endif
+
+    return result;
+}
+
+v8::Local<v8::Value> V8Proxy::runScript(v8::Handle<v8::Script> script, bool isInlineCode)
+{
+    if (script.IsEmpty())
+        return notHandledByInterceptor();
+
+    V8GCController::checkMemoryUsage();
+    // Compute the source string and prevent against infinite recursion.
+    if (m_recursion >= kMaxRecursionDepth) {
+        v8::Local<v8::String> code = v8ExternalString("throw RangeError('Recursion too deep')");
+        // FIXME: Ideally, we should be able to re-use the origin of the
+        // script passed to us as the argument instead of using an empty string
+        // and 0 baseLine.
+        script = compileScript(code, "", 0);
+    }
+
+    if (handleOutOfMemory())
+        ASSERT(script.IsEmpty());
+
+    if (script.IsEmpty())
+        return notHandledByInterceptor();
+
+    // Save the previous value of the inlineCode flag and update the flag for
+    // the duration of the script invocation.
+    bool previousInlineCode = inlineCode();
+    setInlineCode(isInlineCode);
+
+    // Run the script and keep track of the current recursion depth.
+    v8::Local<v8::Value> result;
+    {
+        V8ConsoleMessage::Scope scope;
+
+        // See comment in V8Proxy::callFunction.
+        m_frame->keepAlive();
+
+        m_recursion++;
+        result = script->Run();
+        m_recursion--;
+    }
+
+    // Release the storage mutex if applicable.
+    releaseStorageMutex();
+
+    if (handleOutOfMemory())
+        ASSERT(result.IsEmpty());
+
+    // Handle V8 internal error situation (Out-of-memory).
+    if (result.IsEmpty())
+        return notHandledByInterceptor();
+
+    // Restore inlineCode flag.
+    setInlineCode(previousInlineCode);
+
+    if (v8::V8::IsDead())
+        handleFatalErrorInV8();
+
+    return result;
+}
+
+v8::Local<v8::Value> V8Proxy::callFunction(v8::Handle<v8::Function> function, v8::Handle<v8::Object> receiver, int argc, v8::Handle<v8::Value> args[])
+{
+    V8GCController::checkMemoryUsage();
+    v8::Local<v8::Value> result;
+    {
+        V8ConsoleMessage::Scope scope;
+
+        if (m_recursion >= kMaxRecursionDepth) {
+            v8::Local<v8::String> code = v8::String::New("throw new RangeError('Maximum call stack size exceeded.')");
+            if (code.IsEmpty())
+                return result;
+            v8::Local<v8::Script> script = v8::Script::Compile(code);
+            if (script.IsEmpty())
+                return result;
+            script->Run();
+            return result;
+        }
+
+        // Evaluating the JavaScript could cause the frame to be deallocated,
+        // so we start the keep alive timer here.
+        // Frame::keepAlive method adds the ref count of the frame and sets a
+        // timer to decrease the ref count. It assumes that the current JavaScript
+        // execution finishs before firing the timer.
+        m_frame->keepAlive();
+
+#if ENABLE(INSPECTOR)
+        Page* inspectedPage = InspectorTimelineAgent::instanceCount() ? m_frame->page(): 0;
+        if (inspectedPage) {
+            if (InspectorTimelineAgent* timelineAgent = inspectedPage->inspectorTimelineAgent()) {
+                v8::ScriptOrigin origin = function->GetScriptOrigin();
+                String resourceName("undefined");
+                int lineNumber = 1;
+                if (!origin.ResourceName().IsEmpty()) {
+                    resourceName = toWebCoreString(origin.ResourceName());
+                    lineNumber = function->GetScriptLineNumber() + 1;
+                }
+                timelineAgent->willCallFunction(resourceName, lineNumber);
+            } else
+                inspectedPage = 0;
+        }
+#endif // !ENABLE(INSPECTOR)
+
+        m_recursion++;
+        result = function->Call(receiver, argc, args);
+        m_recursion--;
+
+#if ENABLE(INSPECTOR)
+        if (inspectedPage)
+            if (InspectorTimelineAgent* timelineAgent = inspectedPage->inspectorTimelineAgent())
+                timelineAgent->didCallFunction();
+#endif // !ENABLE(INSPECTOR)
+
+    }
+
+    // Release the storage mutex if applicable.
+    releaseStorageMutex();
+
+    if (v8::V8::IsDead())
+        handleFatalErrorInV8();
+
+    return result;
+}
+
+v8::Local<v8::Value> V8Proxy::callFunctionWithoutFrame(v8::Handle<v8::Function> function, v8::Handle<v8::Object> receiver, int argc, v8::Handle<v8::Value> args[])
+{
+    V8GCController::checkMemoryUsage();
+    v8::Local<v8::Value> result = function->Call(receiver, argc, args);
+
+    if (v8::V8::IsDead())
+        handleFatalErrorInV8();
+
+    return result;
+}
+
+v8::Local<v8::Value> V8Proxy::newInstance(v8::Handle<v8::Function> constructor, int argc, v8::Handle<v8::Value> args[])
+{
+    // No artificial limitations on the depth of recursion, see comment in
+    // V8Proxy::callFunction.
+    v8::Local<v8::Value> result;
+    {
+        V8ConsoleMessage::Scope scope;
+
+        // See comment in V8Proxy::callFunction.
+        m_frame->keepAlive();
+
+        result = constructor->NewInstance(argc, args);
+    }
+
+    if (v8::V8::IsDead())
+        handleFatalErrorInV8();
+
+    return result;
+}
+
+DOMWindow* V8Proxy::retrieveWindow(v8::Handle<v8::Context> context)
+{
+    v8::Handle<v8::Object> global = context->Global();
+    ASSERT(!global.IsEmpty());
+    global = V8DOMWrapper::lookupDOMWrapper(V8DOMWindow::GetTemplate(), global);
+    ASSERT(!global.IsEmpty());
+    return V8DOMWindow::toNative(global);
+}
+
+Frame* V8Proxy::retrieveFrame(v8::Handle<v8::Context> context)
+{
+    DOMWindow* window = retrieveWindow(context);
+    Frame* frame = window->frame();
+    if (frame && frame->domWindow() == window)
+        return frame;
+    // We return 0 here because |context| is detached from the Frame.  If we
+    // did return |frame| we could get in trouble because the frame could be
+    // navigated to another security origin.
+    return 0;
+}
+
+Frame* V8Proxy::retrieveFrameForEnteredContext()
+{
+    v8::Handle<v8::Context> context = v8::Context::GetEntered();
+    if (context.IsEmpty())
+        return 0;
+    return retrieveFrame(context);
+}
+
+Frame* V8Proxy::retrieveFrameForCurrentContext()
+{
+    v8::Handle<v8::Context> context = v8::Context::GetCurrent();
+    if (context.IsEmpty())
+        return 0;
+    return retrieveFrame(context);
+}
+
+Frame* V8Proxy::retrieveFrameForCallingContext()
+{
+    v8::Handle<v8::Context> context = v8::Context::GetCalling();
+    if (context.IsEmpty())
+        return 0;
+    return retrieveFrame(context);
+}
+
+V8Proxy* V8Proxy::retrieve()
+{
+    DOMWindow* window = retrieveWindow(currentContext());
+    ASSERT(window);
+    return retrieve(window->frame());
+}
+
+V8Proxy* V8Proxy::retrieve(Frame* frame)
+{
+    if (!frame)
+        return 0;
+    return frame->script()->canExecuteScripts(NotAboutToExecuteScript) ? frame->script()->proxy() : 0;
+}
+
+V8Proxy* V8Proxy::retrieve(ScriptExecutionContext* context)
+{
+    if (!context || !context->isDocument())
+        return 0;
+    return retrieve(static_cast<Document*>(context)->frame());
+}
+
+void V8Proxy::disconnectFrame()
+{
+}
+
+void V8Proxy::releaseStorageMutex()
+{
+    // If we've just left a top level script context and local storage has been
+    // instantiated, we must ensure that any storage locks have been freed.
+    // Per http://dev.w3.org/html5/spec/Overview.html#storage-mutex
+    if (m_recursion != 0)
+        return;
+    Page* page = m_frame->page();
+    if (!page)
+        return;
+    if (page->group().hasLocalStorage())
+        page->group().localStorage()->unlock();
+}
+
+void V8Proxy::resetIsolatedWorlds()
+{
+    for (IsolatedWorldMap::iterator iter = m_isolatedWorlds.begin();
+         iter != m_isolatedWorlds.end(); ++iter) {
+        iter->second->destroy();
+    }
+    m_isolatedWorlds.clear();
+}
+
+void V8Proxy::clearForClose()
+{
+    resetIsolatedWorlds();
+    windowShell()->clearForClose();
+}
+
+void V8Proxy::clearForNavigation()
+{
+    resetIsolatedWorlds();
+    windowShell()->clearForNavigation();
+}
+
+void V8Proxy::setDOMException(int exceptionCode)
+{
+    if (exceptionCode <= 0)
+        return;
+
+    ExceptionCodeDescription description;
+    getExceptionCodeDescription(exceptionCode, description);
+
+    v8::Handle<v8::Value> exception;
+    switch (description.type) {
+    case DOMExceptionType:
+        exception = toV8(DOMCoreException::create(description));
+        break;
+    case RangeExceptionType:
+        exception = toV8(RangeException::create(description));
+        break;
+    case EventExceptionType:
+        exception = toV8(EventException::create(description));
+        break;
+    case XMLHttpRequestExceptionType:
+        exception = toV8(XMLHttpRequestException::create(description));
+        break;
+#if ENABLE(SVG)
+    case SVGExceptionType:
+        exception = toV8(SVGException::create(description));
+        break;
+#endif
+#if ENABLE(XPATH)
+    case XPathExceptionType:
+        exception = toV8(XPathException::create(description));
+        break;
+#endif
+#if ENABLE(DATABASE)
+    case SQLExceptionType:
+        exception = toV8(SQLException::create(description));
+        break;
+#endif
+    default:
+        ASSERT_NOT_REACHED();
+    }
+
+    if (!exception.IsEmpty())
+        v8::ThrowException(exception);
+}
+
+v8::Handle<v8::Value> V8Proxy::throwError(ErrorType type, const char* message)
+{
+    switch (type) {
+    case RangeError:
+        return v8::ThrowException(v8::Exception::RangeError(v8String(message)));
+    case ReferenceError:
+        return v8::ThrowException(v8::Exception::ReferenceError(v8String(message)));
+    case SyntaxError:
+        return v8::ThrowException(v8::Exception::SyntaxError(v8String(message)));
+    case TypeError:
+        return v8::ThrowException(v8::Exception::TypeError(v8String(message)));
+    case GeneralError:
+        return v8::ThrowException(v8::Exception::Error(v8String(message)));
+    default:
+        ASSERT_NOT_REACHED();
+        return notHandledByInterceptor();
+    }
+}
+
+v8::Handle<v8::Value> V8Proxy::throwTypeError()
+{
+    return throwError(TypeError, "Type error");
+}
+
+v8::Handle<v8::Value> V8Proxy::throwSyntaxError()
+{
+    return throwError(SyntaxError, "Syntax error");
+}
+
+v8::Local<v8::Context> V8Proxy::context(Frame* frame)
+{
+    v8::Local<v8::Context> context = V8Proxy::mainWorldContext(frame);
+    if (context.IsEmpty())
+        return v8::Local<v8::Context>();
+
+    if (V8IsolatedContext* isolatedContext = V8IsolatedContext::getEntered()) {
+        context = v8::Local<v8::Context>::New(isolatedContext->context());
+        if (frame != V8Proxy::retrieveFrame(context))
+            return v8::Local<v8::Context>();
+    }
+
+    return context;
+}
+
+v8::Local<v8::Context> V8Proxy::context()
+{
+    if (V8IsolatedContext* isolatedContext = V8IsolatedContext::getEntered()) {
+        RefPtr<SharedPersistent<v8::Context> > context = isolatedContext->sharedContext();
+        if (m_frame != V8Proxy::retrieveFrame(context->get()))
+            return v8::Local<v8::Context>();
+        return v8::Local<v8::Context>::New(context->get());
+    }
+    return mainWorldContext();
+}
+
+v8::Local<v8::Context> V8Proxy::mainWorldContext()
+{
+    windowShell()->initContextIfNeeded();
+    return v8::Local<v8::Context>::New(windowShell()->context());
+}
+
+v8::Local<v8::Context> V8Proxy::mainWorldContext(Frame* frame)
+{
+    V8Proxy* proxy = retrieve(frame);
+    if (!proxy)
+        return v8::Local<v8::Context>();
+
+    return proxy->mainWorldContext();
+}
+
+v8::Local<v8::Context> V8Proxy::currentContext()
+{
+    return v8::Context::GetCurrent();
+}
+
+v8::Handle<v8::Value> V8Proxy::checkNewLegal(const v8::Arguments& args)
+{
+    if (!AllowAllocation::m_current)
+        return throwError(TypeError, "Illegal constructor");
+
+    return args.This();
+}
+
+void V8Proxy::processConsoleMessages()
+{
+    V8ConsoleMessage::processDelayed();
+}
+
+void V8Proxy::registerExtensionWithV8(v8::Extension* extension)
+{
+    // If the extension exists in our list, it was already registered with V8.
+    if (!registeredExtensionWithV8(extension))
+        v8::RegisterExtension(extension);
+}
+
+bool V8Proxy::registeredExtensionWithV8(v8::Extension* extension)
+{
+    for (size_t i = 0; i < m_extensions.size(); ++i) {
+        if (m_extensions[i].extension == extension)
+            return true;
+    }
+
+    return false;
+}
+
+void V8Proxy::registerExtension(v8::Extension* extension, const String& schemeRestriction)
+{
+    registerExtensionWithV8(extension);
+    V8ExtensionInfo info = {schemeRestriction, 0, extension};
+    m_extensions.append(info);
+}
+
+void V8Proxy::registerExtension(v8::Extension* extension, int extensionGroup)
+{
+    registerExtensionWithV8(extension);
+    V8ExtensionInfo info = {String(), extensionGroup, extension};
+    m_extensions.append(info);
+}
+
+bool V8Proxy::setContextDebugId(int debugId)
+{
+    ASSERT(debugId > 0);
+    v8::HandleScope scope;
+    v8::Handle<v8::Context> context = windowShell()->context();
+    if (context.IsEmpty())
+        return false;
+    if (!context->GetData()->IsUndefined())
+        return false;
+
+    v8::Context::Scope contextScope(context);
+
+    char buffer[32];
+    snprintf(buffer, sizeof(buffer), "page,%d", debugId);
+    context->SetData(v8::String::New(buffer));
+
+    return true;
+}
+
+int V8Proxy::contextDebugId(v8::Handle<v8::Context> context)
+{
+    v8::HandleScope scope;
+    if (!context->GetData()->IsString())
+        return -1;
+    v8::String::AsciiValue ascii(context->GetData());
+    char* comma = strnstr(*ascii, ",", ascii.length());
+    if (!comma)
+        return -1;
+    return atoi(comma + 1);
+}
+
+v8::Local<v8::Context> toV8Context(ScriptExecutionContext* context, const WorldContextHandle& worldContext)
+{
+    if (context->isDocument()) {
+        if (V8Proxy* proxy = V8Proxy::retrieve(context))
+            return worldContext.adjustedContext(proxy);
+#if ENABLE(WORKERS)
+    } else if (context->isWorkerContext()) {
+        if (WorkerContextExecutionProxy* proxy = static_cast<WorkerContext*>(context)->script()->proxy())
+            return proxy->context();
+#endif
+    }
+    return v8::Local<v8::Context>();
+}
+
+}  // namespace WebCore