C++ JSDOMWindow::impl方法代码示例

void JSDOMWindow::putByIndex(JSCell* cell, ExecState* exec, unsigned index, JSValue value, bool shouldThrow)
{
    JSDOMWindow* thisObject = jsCast<JSDOMWindow*>(cell);
    if (!thisObject->impl().frame())
        return;
    
    PropertyName propertyName = Identifier::from(exec, index);

    // Optimization: access JavaScript global variables directly before involving the DOM.
    if (thisObject->JSGlobalObject::hasOwnPropertyForWrite(exec, propertyName)) {
        if (BindingSecurity::shouldAllowAccessToDOMWindow(exec, thisObject->impl()))
            JSGlobalObject::putByIndex(thisObject, exec, index, value, shouldThrow);
        return;
    }
    
    if (BindingSecurity::shouldAllowAccessToDOMWindow(exec, thisObject->impl()))
        Base::putByIndex(thisObject, exec, index, value, shouldThrow);
}

void JSDOMWindow::put(JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
{
    JSDOMWindow* thisObject = jsCast<JSDOMWindow*>(cell);
    if (!thisObject->impl()->frame())
        return;

    // Optimization: access JavaScript global variables directly before involving the DOM.
    if (thisObject->JSGlobalObject::hasOwnPropertyForWrite(exec, propertyName)) {
        if (BindingSecurity::shouldAllowAccessToDOMWindow(exec, thisObject->impl()))
            JSGlobalObject::put(thisObject, exec, propertyName, value, slot);
        return;
    }

    if (lookupPut<JSDOMWindow>(exec, propertyName, value, s_info.propHashTable(exec), thisObject))
        return;

    if (BindingSecurity::shouldAllowAccessToDOMWindow(exec, thisObject->impl()))
        Base::put(thisObject, exec, propertyName, value, slot);
}

void JSLazyEventListener::parseCode() const
{
    if (m_parsed)
        return;

    if (m_globalObject->scriptExecutionContext()->isDocument()) {
        JSDOMWindow* window = static_cast<JSDOMWindow*>(m_globalObject);
        Frame* frame = window->impl()->frame();
        if (!frame)
            return;
        // FIXME: Is this check needed for non-Document contexts?
        ScriptController* script = frame->script();
        if (!script->isEnabled() || script->isPaused())
            return;
    }

    m_parsed = true;

    ExecState* exec = m_globalObject->globalExec();

    MarkedArgumentBuffer args;
    UString sourceURL(m_globalObject->scriptExecutionContext()->url().string());
    args.append(jsNontrivialString(exec, m_eventParameterName));
    args.append(jsString(exec, m_code));

    // FIXME: Passing the document's URL to construct is not always correct, since this event listener might
    // have been added with setAttribute from a script, and we should pass String() in that case.
    m_jsFunction = constructFunction(exec, args, Identifier(exec, m_functionName), sourceURL, m_lineNumber); // FIXME: is globalExec ok?

    JSFunction* listenerAsFunction = static_cast<JSFunction*>(m_jsFunction);

    if (exec->hadException()) {
        exec->clearException();

        // failed to parse, so let's just make this listener a no-op
        m_jsFunction = 0;
    } else if (m_originalNode) {
        // Add the event's home element to the scope
        // (and the document, and the form - see JSHTMLElement::eventHandlerScope)
        ScopeChain scope = listenerAsFunction->scope();

        JSValue thisObj = toJS(exec, m_originalNode);
        if (thisObj.isObject()) {
            static_cast<JSNode*>(asObject(thisObj))->pushEventHandlerScope(exec, scope);
            listenerAsFunction->setScope(scope);
        }
    }

    // Since we only parse once, there's no need to keep data used for parsing around anymore.
    m_functionName = String();
    m_code = String();
    m_eventParameterName = String();
}

bool JSDOMWindow::defineOwnProperty(JSC::JSObject* object, JSC::ExecState* exec, JSC::PropertyName propertyName, JSC::PropertyDescriptor& descriptor, bool shouldThrow)
{
    JSDOMWindow* thisObject = jsCast<JSDOMWindow*>(object);
    // Only allow defining properties in this way by frames in the same origin, as it allows setters to be introduced.
    if (!BindingSecurity::shouldAllowAccessToDOMWindow(exec, thisObject->impl()))
        return false;

    // Don't allow shadowing location using accessor properties.
    if (descriptor.isAccessorDescriptor() && propertyName == Identifier(exec, "location"))
        return false;

    return Base::defineOwnProperty(thisObject, exec, propertyName, descriptor, shouldThrow);
}

JSValuePtr windowProtoFuncShowModalDialog(ExecState* exec, JSObject*, JSValuePtr thisValue, const ArgList& args)
{
    JSDOMWindow* window = toJSDOMWindow(thisValue);
    if (!window)
        return throwError(exec, TypeError);
    if (!window->allowsAccessFrom(exec))
        return jsUndefined();

    Frame* frame = window->impl()->frame();
    if (!frame)
        return jsUndefined();

    return showModalDialog(exec, frame, valueToStringWithUndefinedOrNullCheck(exec, args.at(exec, 0)), args.at(exec, 1), valueToStringWithUndefinedOrNullCheck(exec, args.at(exec, 2)));
}

void ScheduledAction::execute(Document* document)
{
    JSDOMWindow* window = toJSDOMWindow(document->frame(), m_isolatedWorld.get());
    if (!window)
        return;

    RefPtr<Frame> frame = window->impl()->frame();
    if (!frame || !frame->script()->canExecuteScripts(AboutToExecuteScript))
        return;

    if (m_function)
        executeFunctionInContext(window, window->shell(), document);
    else
        frame->script()->executeScriptInWorld(m_isolatedWorld.get(), m_code);
}

ScriptCachedFrameData::ScriptCachedFrameData(Frame* frame)
    : m_domWindow(0)
{
    JSLock lock(SilenceAssertionsOnly);

    ScriptController* scriptController = frame->script();
    ScriptController::ShellMap& windowShells = scriptController->m_windowShells;

    ScriptController::ShellMap::iterator windowShellsEnd = windowShells.end();
    for (ScriptController::ShellMap::iterator iter = windowShells.begin(); iter != windowShellsEnd; ++iter) {
        JSDOMWindow* window = iter->second->window();
        m_windows.add(iter->first.get(), window);
        m_domWindow = window->impl();
    }

    scriptController->attachDebugger(0);
}

void ScheduledAction::execute(Document* document)
{
    JSDOMWindow* window = toJSDOMWindow(document->frame());
    if (!window)
        return;

    RefPtr<Frame> frame = window->impl()->frame();
    if (!frame || !frame->script()->isEnabled())
        return;

    frame->script()->setProcessingTimerCallback(true);

    if (m_function) {
        executeFunctionInContext(window, window->shell());
        Document::updateStyleForAllDocuments();
    } else
        frame->loader()->executeScript(m_code);

    frame->script()->setProcessingTimerCallback(false);
}

bool WebFrame::stringByEvaluatingJavaScriptInScriptWorld(WebScriptWorld* world, void* jsGlobalObject, const char* script, const char** evaluationResult)
{
    if (!world || !jsGlobalObject || !evaluationResult)
        return false;
    *evaluationResult = 0;

    Frame* coreFrame = core(this);
    JSObjectRef globalObjectRef = reinterpret_cast<JSObjectRef>(jsGlobalObject);
    String string = String(script);

    // Start off with some guess at a frame and a global object, we'll try to do better...!
    JSDOMWindow* anyWorldGlobalObject = coreFrame->script()->globalObject(mainThreadNormalWorld());

    // The global object is probably a shell object? - if so, we know how to use this!
    JSC::JSObject* globalObjectObj = toJS(globalObjectRef);
    if (!strcmp(globalObjectObj->classInfo()->className, "JSDOMWindowShell"))
        anyWorldGlobalObject = static_cast<JSDOMWindowShell*>(globalObjectObj)->window();

    // Get the frame from the global object we've settled on.
    Frame* frame = anyWorldGlobalObject->impl()->frame();
    ASSERT(frame->document());
    JSC::JSValue result = frame->script()->executeScriptInWorld(world->world(), string, true).jsValue();

    if (!frame) // In case the script removed our frame from the page.
        return true;

    // This bizarre set of rules matches behavior from WebKit for Safari 2.0.
    // If you don't like it, use -[WebScriptObject evaluateWebScript:] or 
    // JSEvaluateScript instead, since they have less surprising semantics.
    if (!result || !result.isBoolean() && !result.isString() && !result.isNumber())
        return true;

    JSC::JSLock lock(JSC::SilenceAssertionsOnly);
    String resultString = ustringToString(result.toString(anyWorldGlobalObject->globalExec()));
    *evaluationResult = strdup(resultString.utf8().data());

    return true;
}

void JSEventListener::handleEvent(ScriptExecutionContext* scriptExecutionContext, Event* event)
{
    ASSERT(scriptExecutionContext);
    if (!scriptExecutionContext || scriptExecutionContext->isJSExecutionForbidden())
        return;

    JSLock lock(SilenceAssertionsOnly);

    JSObject* jsFunction = this->jsFunction(scriptExecutionContext);
    if (!jsFunction)
        return;

    JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(scriptExecutionContext, m_isolatedWorld.get());
    if (!globalObject)
        return;

    if (scriptExecutionContext->isDocument()) {
        JSDOMWindow* window = static_cast<JSDOMWindow*>(globalObject);
        Frame* frame = window->impl()->frame();
        if (!frame)
            return;
        // The window must still be active in its frame. See <https://bugs.webkit.org/show_bug.cgi?id=21921>.
        // FIXME: A better fix for this may be to change DOMWindow::frame() to not return a frame the detached window used to be in.
        if (frame->domWindow() != window->impl())
            return;
        // FIXME: Is this check needed for other contexts?
        ScriptController* script = frame->script();
        if (!script->canExecuteScripts(AboutToExecuteScript) || script->isPaused())
            return;
    }

    ExecState* exec = globalObject->globalExec();
    JSValue handleEventFunction = jsFunction;

    CallData callData;
    CallType callType = getCallData(handleEventFunction, callData);
    // If jsFunction is not actually a function, see if it implements the EventListener interface and use that
    if (callType == CallTypeNone) {
        handleEventFunction = jsFunction->get(exec, Identifier(exec, "handleEvent"));
        callType = getCallData(handleEventFunction, callData);
    }

    if (callType != CallTypeNone) {
        RefPtr<JSEventListener> protect(this);

        MarkedArgumentBuffer args;
        args.append(toJS(exec, globalObject, event));

        Event* savedEvent = globalObject->currentEvent();
        globalObject->setCurrentEvent(event);

        JSGlobalData& globalData = globalObject->globalData();
        DynamicGlobalObjectScope globalObjectScope(globalData, globalData.dynamicGlobalObject ? globalData.dynamicGlobalObject : globalObject);

        globalData.timeoutChecker.start();
        JSValue thisValue = handleEventFunction == jsFunction ? toJS(exec, globalObject, event->currentTarget()) : jsFunction;
        JSValue retval = scriptExecutionContext->isDocument()
                         ? JSMainThreadExecState::call(exec, handleEventFunction, callType, callData, thisValue, args)
                         : JSC::call(exec, handleEventFunction, callType, callData, thisValue, args);
        globalData.timeoutChecker.stop();

        globalObject->setCurrentEvent(savedEvent);

#if ENABLE(WORKERS)
        if (scriptExecutionContext->isWorkerContext()) {
            bool terminatorCausedException = (exec->hadException() && isTerminatedExecutionException(exec->exception()));
            if (terminatorCausedException || globalData.terminator.shouldTerminate())
                static_cast<WorkerContext*>(scriptExecutionContext)->script()->forbidExecution();
        }
#endif

        if (exec->hadException()) {
            event->target()->uncaughtExceptionInEventHandler();
            reportCurrentException(exec);
        } else {
            if (!retval.isUndefinedOrNull() && event->storesResultAsString())
                event->storeResult(ustringToString(retval.toString(exec)->value(exec)));
            if (m_isAttribute) {
                if (retval.isFalse())
                    event->preventDefault();
            }
        }
    }
}

void JSEventListener::handleEvent(ScriptExecutionContext* scriptExecutionContext, Event* event)
{
    ASSERT(scriptExecutionContext);
    if (!scriptExecutionContext || scriptExecutionContext->isJSExecutionForbidden())
        return;

    JSLockHolder lock(scriptExecutionContext->vm());

    JSObject* jsFunction = this->jsFunction(scriptExecutionContext);
    if (!jsFunction)
        return;

    JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(scriptExecutionContext, *m_isolatedWorld);
    if (!globalObject)
        return;

    if (scriptExecutionContext->isDocument()) {
        JSDOMWindow* window = jsCast<JSDOMWindow*>(globalObject);
        if (!window->impl().isCurrentlyDisplayedInFrame())
            return;
        // FIXME: Is this check needed for other contexts?
        ScriptController& script = window->impl().frame()->script();
        if (!script.canExecuteScripts(AboutToExecuteScript) || script.isPaused())
            return;
    }

    ExecState* exec = globalObject->globalExec();
    JSValue handleEventFunction = jsFunction;

    CallData callData;
    CallType callType = getCallData(handleEventFunction, callData);
    // If jsFunction is not actually a function, see if it implements the EventListener interface and use that
    if (callType == CallTypeNone) {
        handleEventFunction = jsFunction->get(exec, Identifier::fromString(exec, "handleEvent"));
        callType = getCallData(handleEventFunction, callData);
    }

    if (callType != CallTypeNone) {
        Ref<JSEventListener> protect(*this);

        MarkedArgumentBuffer args;
        args.append(toJS(exec, globalObject, event));

        Event* savedEvent = globalObject->currentEvent();
        globalObject->setCurrentEvent(event);

        VM& vm = globalObject->vm();
        VMEntryScope entryScope(vm, vm.entryScope ? vm.entryScope->globalObject() : globalObject);

        InspectorInstrumentationCookie cookie = JSMainThreadExecState::instrumentFunctionCall(scriptExecutionContext, callType, callData);

        JSValue thisValue = handleEventFunction == jsFunction ? toJS(exec, globalObject, event->currentTarget()) : jsFunction;
        NakedPtr<Exception> exception;
        JSValue retval = scriptExecutionContext->isDocument()
            ? JSMainThreadExecState::call(exec, handleEventFunction, callType, callData, thisValue, args, exception)
            : JSC::call(exec, handleEventFunction, callType, callData, thisValue, args, exception);

        InspectorInstrumentation::didCallFunction(cookie, scriptExecutionContext);

        globalObject->setCurrentEvent(savedEvent);

        if (is<WorkerGlobalScope>(*scriptExecutionContext)) {
            bool terminatorCausedException = (exec->hadException() && isTerminatedExecutionException(exec->exception()));
            if (terminatorCausedException || (vm.watchdog && vm.watchdog->didFire()))
                downcast<WorkerGlobalScope>(*scriptExecutionContext).script()->forbidExecution();
        }

        if (exception) {
            event->target()->uncaughtExceptionInEventHandler();
            reportException(exec, exception);
        } else {
            if (!retval.isUndefinedOrNull() && is<BeforeUnloadEvent>(*event))
                downcast<BeforeUnloadEvent>(*event).setReturnValue(retval.toString(exec)->value(exec));
            if (m_isAttribute) {
                if (retval.isFalse())
                    event->preventDefault();
            }
        }
    }
}

JSObject* JSLazyEventListener::initializeJSFunction(ScriptExecutionContext* executionContext) const
{
    ASSERT(executionContext);
    ASSERT(executionContext->isDocument());
    if (!executionContext)
        return 0;

    Frame* frame = static_cast<Document*>(executionContext)->frame();
    if (!frame)
        return 0;

    ScriptController* scriptController = frame->script();
    if (!scriptController->canExecuteScripts(AboutToExecuteScript))
        return 0;

    JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(executionContext, isolatedWorld());
    if (!globalObject)
        return 0;

    if (executionContext->isDocument()) {
        JSDOMWindow* window = static_cast<JSDOMWindow*>(globalObject);
        Frame* frame = window->impl()->frame();
        if (!frame)
            return 0;
        // FIXME: Is this check needed for non-Document contexts?
        ScriptController* script = frame->script();
        if (!script->canExecuteScripts(AboutToExecuteScript) || script->isPaused())
            return 0;
    }

    ExecState* exec = globalObject->globalExec();

    MarkedArgumentBuffer args;
    args.append(jsNontrivialString(exec, stringToUString(m_eventParameterName)));
    args.append(jsString(exec, m_code));

    JSObject* jsFunction = constructFunction(exec, args, Identifier(exec, stringToUString(m_functionName)), stringToUString(m_sourceURL), m_lineNumber); // FIXME: is globalExec ok?
    if (exec->hadException()) {
        exec->clearException();
        return 0;
    }

    JSFunction* listenerAsFunction = static_cast<JSFunction*>(jsFunction);
    if (m_originalNode) {
        if (!wrapper()) {
            // Ensure that 'node' has a JavaScript wrapper to mark the event listener we're creating.
            JSLock lock(SilenceAssertionsOnly);
            // FIXME: Should pass the global object associated with the node
            setWrapper(asObject(toJS(globalObject->globalExec(), globalObject, m_originalNode)));
        }

        // Add the event's home element to the scope
        // (and the document, and the form - see JSHTMLElement::eventHandlerScope)
        ScopeChain scope = listenerAsFunction->scope();
        static_cast<JSNode*>(wrapper())->pushEventHandlerScope(exec, scope);
        listenerAsFunction->setScope(scope);
    }

    // Since we only parse once, there's no need to keep data used for parsing around anymore.
    m_functionName = String();
    m_code = String();
    m_eventParameterName = String();
    m_sourceURL = String();
    return jsFunction;
}

JSValuePtr windowProtoFuncOpen(ExecState* exec, JSObject*, JSValuePtr thisValue, const ArgList& args)
{
    JSDOMWindow* window = toJSDOMWindow(thisValue);
    if (!window)
        return throwError(exec, TypeError);
    if (!window->allowsAccessFrom(exec))
        return jsUndefined();

    Frame* frame = window->impl()->frame();
    if (!frame)
        return jsUndefined();
    Frame* activeFrame = asJSDOMWindow(exec->dynamicGlobalObject())->impl()->frame();
    if (!activeFrame)
        return  jsUndefined();

    Page* page = frame->page();

    String urlString = valueToStringWithUndefinedOrNullCheck(exec, args.at(exec, 0));
    AtomicString frameName = args.at(exec, 1)->isUndefinedOrNull() ? "_blank" : AtomicString(args.at(exec, 1)->toString(exec));

    // Because FrameTree::find() returns true for empty strings, we must check for empty framenames.
    // Otherwise, illegitimate window.open() calls with no name will pass right through the popup blocker.
    if (!allowPopUp(exec) && (frameName.isEmpty() || !frame->tree()->find(frameName)))
        return jsUndefined();

    // Get the target frame for the special cases of _top and _parent.  In those
    // cases, we can schedule a location change right now and return early.
    bool topOrParent = false;
    if (frameName == "_top") {
        frame = frame->tree()->top();
        topOrParent = true;
    } else if (frameName == "_parent") {
        if (Frame* parent = frame->tree()->parent())
            frame = parent;
        topOrParent = true;
    }
    if (topOrParent) {
        if (!activeFrame->loader()->shouldAllowNavigation(frame))
            return jsUndefined();

        String completedURL;
        if (!urlString.isEmpty())
            completedURL = activeFrame->document()->completeURL(urlString).string();

        const JSDOMWindow* targetedWindow = toJSDOMWindow(frame);
        if (!completedURL.isEmpty() && (!protocolIs(completedURL, "javascript") || (targetedWindow && targetedWindow->allowsAccessFrom(exec)))) {
            bool userGesture = activeFrame->script()->processingUserGesture();
            frame->loader()->scheduleLocationChange(completedURL, activeFrame->loader()->outgoingReferrer(), false, userGesture);
        }
        return toJS(exec, frame->domWindow());
    }

    // In the case of a named frame or a new window, we'll use the createWindow() helper
    WindowFeatures windowFeatures(valueToStringWithUndefinedOrNullCheck(exec, args.at(exec, 2)));
    FloatRect windowRect(windowFeatures.xSet ? windowFeatures.x : 0, windowFeatures.ySet ? windowFeatures.y : 0,
                         windowFeatures.widthSet ? windowFeatures.width : 0, windowFeatures.heightSet ? windowFeatures.height : 0);
    DOMWindow::adjustWindowRect(screenAvailableRect(page ? page->mainFrame()->view() : 0), windowRect, windowRect);

    windowFeatures.x = windowRect.x();
    windowFeatures.y = windowRect.y();
    windowFeatures.height = windowRect.height();
    windowFeatures.width = windowRect.width();

    frame = createWindow(exec, frame, urlString, frameName, windowFeatures, noValue());

    if (!frame)
        return jsUndefined();

    return toJS(exec, frame->domWindow()); // global object
}

void JSEventListener::handleEvent(Event* event, bool isWindowEvent)
{
    JSLock lock(SilenceAssertionsOnly);

    JSObject* jsFunction = this->jsFunction();
    if (!jsFunction)
        return;

    JSDOMGlobalObject* globalObject = m_globalObject;
    // Null check as clearGlobalObject() can clear this and we still get called back by
    // xmlhttprequest objects. See http://bugs.webkit.org/show_bug.cgi?id=13275
    // FIXME: Is this check still necessary? Requests are supposed to be stopped before clearGlobalObject() is called.
    ASSERT(globalObject);
    if (!globalObject)
        return;

    ScriptExecutionContext* scriptExecutionContext = globalObject->scriptExecutionContext();
    if (!scriptExecutionContext)
        return;

    if (scriptExecutionContext->isDocument()) {
        JSDOMWindow* window = static_cast<JSDOMWindow*>(globalObject);
        Frame* frame = window->impl()->frame();
        if (!frame)
            return;
        // The window must still be active in its frame. See <https://bugs.webkit.org/show_bug.cgi?id=21921>.
        // FIXME: A better fix for this may be to change DOMWindow::frame() to not return a frame the detached window used to be in.
        if (frame->domWindow() != window->impl())
            return;
        // FIXME: Is this check needed for other contexts?
        ScriptController* script = frame->script();
        if (!script->isEnabled() || script->isPaused())
            return;
    }

    ExecState* exec = globalObject->globalExec();

    JSValue handleEventFunction = jsFunction->get(exec, Identifier(exec, "handleEvent"));
    CallData callData;
    CallType callType = handleEventFunction.getCallData(callData);
    if (callType == CallTypeNone) {
        handleEventFunction = JSValue();
        callType = jsFunction->getCallData(callData);
    }

    if (callType != CallTypeNone) {
        ref();

        MarkedArgumentBuffer args;
        args.append(toJS(exec, globalObject, event));

        Event* savedEvent = globalObject->currentEvent();
        globalObject->setCurrentEvent(event);

        // If this event handler is the first JavaScript to execute, then the
        // dynamic global object should be set to the global object of the
        // window in which the event occurred.
        JSGlobalData* globalData = globalObject->globalData();
        DynamicGlobalObjectScope globalObjectScope(exec, globalData->dynamicGlobalObject ? globalData->dynamicGlobalObject : globalObject);

        JSValue retval;
        if (handleEventFunction) {
            globalObject->globalData()->timeoutChecker.start();
            retval = call(exec, handleEventFunction, callType, callData, jsFunction, args);
        } else {
            JSValue thisValue;
            if (isWindowEvent)
                thisValue = globalObject->toThisObject(exec);
            else
                thisValue = toJS(exec, globalObject, event->currentTarget());
            globalObject->globalData()->timeoutChecker.start();
            retval = call(exec, jsFunction, callType, callData, thisValue, args);
        }
        globalObject->globalData()->timeoutChecker.stop();

        globalObject->setCurrentEvent(savedEvent);

        if (exec->hadException())
            reportCurrentException(exec);
        else {
            if (!retval.isUndefinedOrNull() && event->storesResultAsString())
                event->storeResult(retval.toString(exec));
            if (m_isAttribute) {
                bool retvalbool;
                if (retval.getBoolean(retvalbool) && !retvalbool)
                    event->preventDefault();
            }
        }

        if (scriptExecutionContext->isDocument())
            Document::updateStyleForAllDocuments();
        deref();
    }
}

void JSAbstractEventListener::handleEvent(Event* event, bool isWindowEvent)
{
    JSObject* listener = listenerObj();
    if (!listener)
        return;

    JSDOMWindow* window = this->window();
    // Null check as clearWindow() can clear this and we still get called back by
    // xmlhttprequest objects. See http://bugs.webkit.org/show_bug.cgi?id=13275
    if (!window)
        return;
    Frame* frame = window->impl()->frame();
    if (!frame)
        return;
    ScriptController* script = frame->script();
    if (!script->isEnabled() || script->isPaused())
        return;

    JSLock lock(false);

    ExecState* exec = window->globalExec();

    JSValue* handleEventFunction = listener->get(exec, Identifier(exec, "handleEvent"));
    CallData callData;
    CallType callType = handleEventFunction->getCallData(callData);
    if (callType == CallTypeNone) {
        handleEventFunction = 0;
        callType = listener->getCallData(callData);
    }

    if (callType != CallTypeNone) {
        ref();

        ArgList args;
        args.append(toJS(exec, event));

        Event* savedEvent = window->currentEvent();
        window->setCurrentEvent(event);

        JSValue* retval;
        if (handleEventFunction) {
            window->startTimeoutCheck();
            retval = call(exec, handleEventFunction, callType, callData, listener, args);
        } else {
            JSValue* thisValue;
            if (isWindowEvent)
                thisValue = window->shell();
            else
                thisValue = toJS(exec, event->currentTarget());
            window->startTimeoutCheck();
            retval = call(exec, listener, callType, callData, thisValue, args);
        }
        window->stopTimeoutCheck();

        window->setCurrentEvent(savedEvent);

        if (exec->hadException())
            frame->domWindow()->console()->reportCurrentException(exec);
        else {
            if (!retval->isUndefinedOrNull() && event->storesResultAsString())
                event->storeResult(retval->toString(exec));
            if (m_isHTML) {
                bool retvalbool;
                if (retval->getBoolean(retvalbool) && !retvalbool)
                    event->preventDefault();
            }
        }

        Document::updateDocumentsRendering();
        deref();
    }
}