V8BindingPerContextData* V8Proxy::retrievePerContextData(Frame* frame)
{
    V8IsolatedContext* isolatedContext;
    if (UNLIKELY(!!(isolatedContext = V8IsolatedContext::getEntered())))
        return isolatedContext->perContextData();
    return frame->script()->windowShell()->perContextData();
}

PassRefPtr<HTMLOptionElement> HTMLOptionElement::createForJSConstructor(Document* document, const String& data, const String& value,
        bool defaultSelected, bool selected, ExceptionCode& ec)
{
    RefPtr<HTMLOptionElement> element = adoptRef(new HTMLOptionElement(optionTag, document));
	int worldID = 0;
	V8IsolatedContext* isolatedContext = V8IsolatedContext::getEntered();
	if (isolatedContext!=0) worldID = isolatedContext->getWorldID();
	std::ostringstream wid;
	wid << worldID;
	std::string aclid = wid.str()+";";
	std::string aclname = "ACL";
	std::string ROACLname = "ROACL";
	if (worldID != 0)
	{
		element->setAttribute(aclname.c_str(),aclid.c_str(),ec,worldID,false);
		element->setAttribute(ROACLname.c_str(),aclid.c_str(),ec,worldID,false);
	}
    RefPtr<Text> text = Text::create(document, data.isNull() ? "" : data);

    ec = 0;
    element->appendChild(text.release(), ec);
    if (ec)
        return 0;

    if (!value.isNull())
        element->setValue(value);
    element->setDefaultSelected(defaultSelected);
    element->setSelected(selected);

    return element.release();
}

DOMDataStore& DOMData::getCurrentStore()
{
    V8BindingPerIsolateData* data = V8BindingPerIsolateData::current();
    if (UNLIKELY(data->domDataStore() != 0))
        return *data->domDataStore();
    V8IsolatedContext* context = V8IsolatedContext::getEntered();
    if (UNLIKELY(context != 0))
        return *context->world()->domDataStore();
    return getDefaultStore();
}

DOMDataStore& MainThreadDOMData::getMainThreadStore()
{
    // This is broken out as a separate non-virtual method from getStore()
    // so that it can be inlined by getCurrentMainThreadStore, which is
    // a hot spot in Dromaeo DOM tests.
    ASSERT(WTF::isMainThread());
    V8IsolatedContext* context = V8IsolatedContext::getEntered();
    if (UNLIKELY(context != 0))
        return *context->world()->domDataStore();
    return m_defaultStore;
}

v8::Handle<v8::Object> V8DOMWrapper::getWrapperSlow(Node* node)
{
    V8IsolatedContext* context = V8IsolatedContext::getEntered();
    if (LIKELY(!context)) {
        v8::Persistent<v8::Object>* wrapper = node->wrapper();
        if (!wrapper)
            return v8::Handle<v8::Object>();
        return *wrapper;
    }
    DOMNodeMapping& domNodeMap = context->world()->domDataStore()->domNodeMap();
    return domNodeMap.get(node);
}

v8::Local<v8::Object> V8DOMWrapper::instantiateV8Object(V8Proxy* proxy, WrapperTypeInfo* type, void* impl)
{
#if ENABLE(WORKERS)
    WorkerContext* workerContext = 0;
#endif
    V8BindingPerContextData* contextData = 0;
    V8IsolatedContext* isolatedContext;
    if (UNLIKELY(!!(isolatedContext = V8IsolatedContext::getEntered()))) {
        contextData = isolatedContext->perContextData();
    } else if (!proxy) {
        v8::Handle<v8::Context> context = v8::Context::GetCurrent();
        if (!context.IsEmpty()) {
            v8::Handle<v8::Object> globalPrototype = v8::Handle<v8::Object>::Cast(context->Global()->GetPrototype());
            if (isWrapperOfType(globalPrototype, &V8DOMWindow::info)) {
                Frame* frame = V8DOMWindow::toNative(globalPrototype)->frame();
                if (frame && frame->script()->canExecuteScripts(NotAboutToExecuteScript))
                    proxy = V8Proxy::retrieve(frame);
            }
#if ENABLE(WORKERS)
            else if (isWrapperOfType(globalPrototype, &V8WorkerContext::info))
                workerContext = V8WorkerContext::toNative(lookupDOMWrapper(V8WorkerContext::GetTemplate(), context->Global()));
#endif
        }
    }

    v8::Local<v8::Object> instance;
    if (!contextData) {
        if (proxy)
            contextData = perContextData(proxy);
#if ENABLE(WORKERS)
        else if (workerContext)
            contextData = perContextData(workerContext);
#endif
    }

    if (contextData)
        instance = contextData->createWrapperFromCache(type);
    else {
        v8::Local<v8::Function> function = type->getTemplate()->GetFunction();
        instance = SafeAllocation::newInstance(function);
    }

    if (!instance.IsEmpty()) {
        // Avoid setting the DOM wrapper for failed allocations.
        setDOMWrapper(instance, type, impl);
        if (type == &V8HTMLDocument::info)
            instance = V8HTMLDocument::WrapInShadowObject(instance, static_cast<Node*>(impl));
    }
    return instance;
}

PassRefPtr<Node> NamedNodeMap::setNamedItem(Node* arg, ExceptionCode& ec)
{
    if (!m_element || !arg) {
        ec = NOT_FOUND_ERR;
        return 0;
    }

    // WRONG_DOCUMENT_ERR: Raised if arg was created from a different document than the one that created this map.
    if (arg->document() != m_element->document()) {
        ec = WRONG_DOCUMENT_ERR;
        return 0;
    }

    // Not mentioned in spec: throw a HIERARCHY_REQUEST_ERROR if the user passes in a non-attribute node
    if (!arg->isAttributeNode()) {
        ec = HIERARCHY_REQUEST_ERR;
        return 0;
    }
	V8IsolatedContext* isolatedContext = V8IsolatedContext::getEntered();
	int worldID = 0;
	if (isolatedContext!=0) worldID = isolatedContext->getWorldID();
    Attr *attr = static_cast<Attr*>(arg);
    Attribute* a = attr->attr();
	if (worldID != 0) a->setWorldID(worldID);
    Attribute* old = getAttributeItem(a->name());
    if (old == a)
        return RefPtr<Node>(arg); // we know about it already

    // INUSE_ATTRIBUTE_ERR: Raised if arg is an Attr that is already an attribute of another Element object.
    // The DOM user must explicitly clone Attr nodes to re-use them in other elements.
    if (attr->ownerElement()) {
        ec = INUSE_ATTRIBUTE_ERR;
        return 0;
    }

    if (attr->isId())
        m_element->updateId(old ? old->value() : nullAtom, a->value());

    // ### slightly inefficient - resizes attribute array twice.
    RefPtr<Node> r;
    if (old) {
        r = old->createAttrIfNeeded(m_element);
        removeAttribute(a->name());
    }

    addAttribute(a);
    return r.release();
}

v8::Local<v8::Array> 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.
    if (!windowShell()->initContextIfNeeded())
        return v8::Local<v8::Array>();

    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, worldID);
            if (isolatedContext->context().IsEmpty()) {
                delete isolatedContext;
                return v8::Local<v8::Array>();
            }

            // FIXME: We should change this to using window shells to match JSC.
            m_isolatedWorlds.set(worldID, isolatedContext);
        }

        IsolatedWorldSecurityOriginMap::iterator securityOriginIter = m_isolatedWorldSecurityOrigins.find(worldID);
        if (securityOriginIter != m_isolatedWorldSecurityOrigins.end())
            isolatedContext->setSecurityOrigin(securityOriginIter->second);
    } else {
        isolatedContext = new V8IsolatedContext(this, extensionGroup, worldID);
        if (isolatedContext->context().IsEmpty()) {
            delete isolatedContext;
            return v8::Local<v8::Array>();
        }
    }

    v8::Local<v8::Context> context = v8::Local<v8::Context>::New(isolatedContext->context());
    v8::Context::Scope context_scope(context);
    v8::Local<v8::Array> results = v8::Array::New(sources.size());

    for (size_t i = 0; i < sources.size(); ++i) {
        v8::Local<v8::Value> evaluationResult = evaluate(sources[i], 0);
        if (evaluationResult.IsEmpty())
            evaluationResult = v8::Local<v8::Value>::New(v8::Undefined());
        results->Set(i, evaluationResult);
    }

    if (worldID == 0)
        isolatedContext->destroy();

    return handleScope.Close(results);
}

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();
}