v8::Persistent<v8::FunctionTemplate> V8TestEventConstructor::GetRawTemplate()
{
    V8BindingPerIsolateData* data = V8BindingPerIsolateData::current();
    V8BindingPerIsolateData::TemplateMap::iterator result = data->rawTemplateMap().find(&info);
    if (result != data->rawTemplateMap().end())
        return result->second;

    v8::HandleScope handleScope;
    v8::Persistent<v8::FunctionTemplate> templ = createRawTemplate();
    data->rawTemplateMap().add(&info, templ);
    return templ;
}

WorkerScriptController::WorkerScriptController(WorkerContext* workerContext)
    : m_workerContext(workerContext)
    , m_isolate(v8::Isolate::New())
    , m_executionForbidden(false)
    , m_executionScheduledToTerminate(false)
{
    V8BindingPerIsolateData* data = V8BindingPerIsolateData::create(m_isolate);
    data->allStores().append(&m_DOMDataStore);
    data->setDOMDataStore(&m_DOMDataStore);
    m_isolate->Enter();
    m_proxy = adoptPtr(new WorkerContextExecutionProxy(workerContext));
}

v8::Persistent<v8::FunctionTemplate> V8CSSCharsetRule::GetTemplate()
{
    V8BindingPerIsolateData* data = V8BindingPerIsolateData::current();
    V8BindingPerIsolateData::TemplateMap::iterator result = data->templateMap().find(&info);
    if (result != data->templateMap().end())
        return result->second;

    v8::HandleScope handleScope;
    v8::Persistent<v8::FunctionTemplate> templ =
        ConfigureV8CSSCharsetRuleTemplate(GetRawTemplate());
    data->templateMap().add(&info, templ);
    return templ;
}

// Create object groups for DOM tree nodes.
void V8GCController::gcPrologue()
{
    v8::HandleScope scope;

#ifndef NDEBUG
    DOMObjectVisitor domObjectVisitor;
    visitDOMObjects(&domObjectVisitor);
#endif

    // Run through all objects with possible pending activity making their
    // wrappers non weak if there is pending activity.
    GCPrologueVisitor prologueVisitor;
    visitActiveDOMObjects(&prologueVisitor);

    // Create object groups.
    GrouperVisitor grouperVisitor;
    visitDOMNodes(&grouperVisitor);
    visitDOMObjects(&grouperVisitor);
    grouperVisitor.applyGrouping();

    // Clean single element cache for string conversions.
    V8BindingPerIsolateData* data = V8BindingPerIsolateData::current();
    data->stringCache()->clearOnGC();
}

v8::Handle<v8::Value> V8HTMLCanvasElement::getContextCallback(const v8::Arguments& args)
{
    INC_STATS("DOM.HTMLCanvasElement.context");
    v8::Handle<v8::Object> holder = args.Holder();
    HTMLCanvasElement* imp = V8HTMLCanvasElement::toNative(holder);
    String contextId = toWebCoreString(args[0]);
    RefPtr<CanvasContextAttributes> attrs;
#if ENABLE(WEBGL)
    if (contextId == "experimental-webgl" || contextId == "webkit-3d") {
        attrs = WebGLContextAttributes::create();
        WebGLContextAttributes* webGLAttrs = static_cast<WebGLContextAttributes*>(attrs.get());
        if (args.Length() > 1 && args[1]->IsObject()) {
            v8::Handle<v8::Object> jsAttrs = args[1]->ToObject();
            v8::Handle<v8::String> alpha = v8::String::New("alpha");
            if (jsAttrs->Has(alpha))
                webGLAttrs->setAlpha(jsAttrs->Get(alpha)->BooleanValue());
            v8::Handle<v8::String> depth = v8::String::New("depth");
            if (jsAttrs->Has(depth))
                webGLAttrs->setDepth(jsAttrs->Get(depth)->BooleanValue());
            v8::Handle<v8::String> stencil = v8::String::New("stencil");
            if (jsAttrs->Has(stencil))
                webGLAttrs->setStencil(jsAttrs->Get(stencil)->BooleanValue());
            v8::Handle<v8::String> antialias = v8::String::New("antialias");
            if (jsAttrs->Has(antialias))
                webGLAttrs->setAntialias(jsAttrs->Get(antialias)->BooleanValue());
            v8::Handle<v8::String> premultipliedAlpha = v8::String::New("premultipliedAlpha");
            if (jsAttrs->Has(premultipliedAlpha))
                webGLAttrs->setPremultipliedAlpha(jsAttrs->Get(premultipliedAlpha)->BooleanValue());
            v8::Handle<v8::String> preserveDrawingBuffer = v8::String::New("preserveDrawingBuffer");
            if (jsAttrs->Has(preserveDrawingBuffer))
                webGLAttrs->setPreserveDrawingBuffer(jsAttrs->Get(preserveDrawingBuffer)->BooleanValue());
        }
    }
#endif
    CanvasRenderingContext* result = imp->getContext(contextId, attrs.get());
    if (!result)
        return v8::Null(args.GetIsolate());

    // Both 2D and 3D canvas contexts can hold on to lots of GPU resources, and we
    // want to take an opportunity to get rid of them as soon as possible when we
    // navigate away from pages using them.
    V8BindingPerIsolateData* perIsolateData = V8BindingPerIsolateData::current(args.GetIsolate());
    perIsolateData->setShouldCollectGarbageSoon();

    if (result->is2d())
        return toV8(static_cast<CanvasRenderingContext2D*>(result), args.GetIsolate());
#if ENABLE(WEBGL)
    else if (result->is3d()) {
        v8::Handle<v8::Value> v8Result = toV8(static_cast<WebGLRenderingContext*>(result), args.GetIsolate());
        if (InspectorInstrumentation::hasFrontends()) {
            ScriptState* scriptState = ScriptState::forContext(v8::Context::GetCurrent());
            ScriptObject glContext(scriptState, v8::Handle<v8::Object>::Cast(v8Result));
            ScriptObject wrapped = InspectorInstrumentation::wrapWebGLRenderingContextForInstrumentation(imp->document(), glContext);
            if (!wrapped.hasNoValue())
                return wrapped.v8Value();
        }
        return v8Result;
    }
#endif
    ASSERT_NOT_REACHED();
    return v8::Null(args.GetIsolate());
}