C++ JSDOMWindowShell类代码示例

void ScriptController::clearWindowShell(bool goingIntoPageCache)
{
    if (m_windowShells.isEmpty())
        return;

    JSLock lock(SilenceAssertionsOnly);

    for (ShellMap::iterator iter = m_windowShells.begin(); iter != m_windowShells.end(); ++iter) {
        JSDOMWindowShell* windowShell = iter->second.get();

        // Clear the debugger from the current window before setting the new window.
        attachDebugger(windowShell, 0);

        windowShell->window()->willRemoveFromWindowShell();
        windowShell->setWindow(m_frame->domWindow());

        // An m_cacheableBindingRootObject persists between page navigations
        // so needs to know about the new JSDOMWindow.
        if (m_cacheableBindingRootObject)
            m_cacheableBindingRootObject->updateGlobalObject(windowShell->window());

        if (Page* page = m_frame->page()) {
            attachDebugger(windowShell, page->debugger());
            windowShell->window()->setProfileGroup(page->group().identifier());
        }
    }

    // It's likely that resetting our windows created a lot of garbage, unless
    // it went in a back/forward cache.
    if (!goingIntoPageCache)
        gcController().garbageCollectSoon();
}

JSValue JSHTMLDocument::open(ExecState* exec)
{
    // For compatibility with other browsers, pass open calls with more than 2 parameters to the window.
    if (exec->argumentCount() > 2) {
        Frame* frame = static_cast<HTMLDocument*>(impl())->frame();
        if (frame) {
            JSDOMWindowShell* wrapper = toJSDOMWindowShell(frame, currentWorld(exec));
            if (wrapper) {
                JSValue function = wrapper->get(exec, Identifier(exec, "open"));
                CallData callData;
                CallType callType = ::getCallData(function, callData);
                if (callType == CallTypeNone)
                    return throwTypeError(exec);
                return JSC::call(exec, function, callType, callData, wrapper, ArgList(exec));
            }
        }
        return jsUndefined();
    }

    // document.open clobbers the security context of the document and
    // aliases it with the active security context.
    Document* activeDocument = asJSDOMWindow(exec->lexicalGlobalObject())->impl()->document();

    // In the case of two parameters or fewer, do a normal document open.
    static_cast<HTMLDocument*>(impl())->open(activeDocument);
    return this;
}

JSValue JSHTMLDocument::open(ExecState& state)
{
    // For compatibility with other browsers, pass open calls with more than 2 parameters to the window.
    if (state.argumentCount() > 2) {
        if (Frame* frame = wrapped().frame()) {
            JSDOMWindowShell* wrapper = toJSDOMWindowShell(frame, currentWorld(&state));
            if (wrapper) {
                JSValue function = wrapper->get(&state, Identifier::fromString(&state, "open"));
                CallData callData;
                CallType callType = ::getCallData(function, callData);
                if (callType == CallTypeNone)
                    return throwTypeError(&state);
                return JSC::call(&state, function, callType, callData, wrapper, ArgList(&state));
            }
        }
        return jsUndefined();
    }

    // document.open clobbers the security context of the document and
    // aliases it with the active security context.
    Document* activeDocument = asJSDOMWindow(state.lexicalGlobalObject())->wrapped().document();

    // In the case of two parameters or fewer, do a normal document open.
    wrapped().open(activeDocument);
    return this;
}

void ScriptCachedFrameData::restore(Frame* frame)
{
    JSLockHolder lock(JSDOMWindowBase::commonJSGlobalData());

    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) {
        DOMWrapperWorld* world = iter->first.get();
        JSDOMWindowShell* windowShell = iter->second.get();

        if (JSDOMWindow* window = m_windows.get(world).get())
            windowShell->setWindow(window->globalData(), window);
        else {
            DOMWindow* domWindow = frame->document()->domWindow();
            if (windowShell->window()->impl() == domWindow)
                continue;

            windowShell->setWindow(domWindow);

            if (Page* page = frame->page()) {
                scriptController->attachDebugger(windowShell, page->debugger());
                windowShell->window()->setProfileGroup(page->group().identifier());
            }
        }
    }
}

bool ScriptController::anyPageIsProcessingUserGesture() const
{
    Page* page = m_frame->page();
    if (!page)
        return false;

    const HashSet<Page*>& pages = page->group().pages();
    HashSet<Page*>::const_iterator end = pages.end();
    for (HashSet<Page*>::const_iterator it = pages.begin(); it != end; ++it) {
        for (Frame* frame = page->mainFrame(); frame; frame = frame->tree()->traverseNext()) {
            ScriptController* script = frame->script();

            if (script->m_allowPopupsFromPlugin)
                return true;

            const ShellMap::const_iterator iterEnd = m_windowShells.end();
            for (ShellMap::const_iterator iter = m_windowShells.begin(); iter != iterEnd; ++iter) {
                JSDOMWindowShell* shell = iter->second.get();
                Event* event = shell->window()->currentEvent();
                if (event && event->fromUserGesture())
                    return true;
            }

            if (isJavaScriptAnchorNavigation())
                return true;
        }
    }

    return false;
}

void ScriptController::enableEval()
{
    JSDOMWindowShell* windowShell = existingWindowShell(mainThreadNormalWorld());
    if (!windowShell)
        return; // Eval is enabled by default.
    windowShell->window()->setEvalEnabled(true);
}

void ScriptController::updateDocument()
{
    Vector<JSC::Strong<JSDOMWindowShell>> windowShells = this->windowShells();
    for (size_t i = 0; i < windowShells.size(); ++i) {
        JSDOMWindowShell* windowShell = windowShells[i].get();
        JSLockHolder lock(windowShell->world().vm());
        windowShell->window()->updateDocument();
    }
}

void JSDOMWindowShell::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
    JSDOMWindowShell* thisObject = static_cast<JSDOMWindowShell*>(cell);
    ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
    COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
    ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
    Base::visitChildren(thisObject, visitor);
    if (thisObject->m_window)
        visitor.append(&thisObject->m_window);
}

ScriptValue ScriptController::evaluateInWorld(const ScriptSourceCode& sourceCode, DOMWrapperWorld* world, ShouldAllowXSS shouldAllowXSS)
{
    const SourceCode& jsSourceCode = sourceCode.jsSourceCode();
    String sourceURL = ustringToString(jsSourceCode.provider()->url());

    if (shouldAllowXSS == DoNotAllowXSS && !m_XSSAuditor->canEvaluate(sourceCode.source())) {
        // This script is not safe to be evaluated.
        return JSValue();
    }

    // evaluate code. Returns the JS return value or 0
    // if there was none, an error occurred or the type couldn't be converted.

    // inlineCode is true for <a href="javascript:doSomething()">
    // and false for <script>doSomething()</script>. Check if it has the
    // expected value in all cases.
    // See smart window.open policy for where this is used.
    JSDOMWindowShell* shell = windowShell(world);
    ExecState* exec = shell->window()->globalExec();
    const String* savedSourceURL = m_sourceURL;
    m_sourceURL = &sourceURL;

    JSLock lock(SilenceAssertionsOnly);

    RefPtr<Frame> protect = m_frame;

#if ENABLE(INSPECTOR)
    if (InspectorTimelineAgent* timelineAgent = m_frame->page() ? m_frame->page()->inspectorTimelineAgent() : 0)
        timelineAgent->willEvaluateScript(sourceURL, sourceCode.startLine());
#endif

    exec->globalData().timeoutChecker.start();
    Completion comp = JSMainThreadExecState::evaluate(exec, exec->dynamicGlobalObject()->globalScopeChain(), jsSourceCode, shell);
    exec->globalData().timeoutChecker.stop();

#if ENABLE(INSPECTOR)
    if (InspectorTimelineAgent* timelineAgent = m_frame->page() ? m_frame->page()->inspectorTimelineAgent() : 0)
        timelineAgent->didEvaluateScript();
#endif

    // Evaluating the JavaScript could cause the frame to be deallocated
    // so we start the keep alive timer here.
    m_frame->keepAlive();

    if (comp.complType() == Normal || comp.complType() == ReturnValue) {
        m_sourceURL = savedSourceURL;
        return comp.value();
    }

    if (comp.complType() == Throw || comp.complType() == Interrupted)
        reportException(exec, comp.value());

    m_sourceURL = savedSourceURL;
    return JSValue();
}

bool ScriptController::executeIfJavaScriptURL(const KURL& url, ShouldReplaceDocumentIfJavaScriptURL shouldReplaceDocumentIfJavaScriptURL)
{
    if (!protocolIsJavaScript(url))
        return false;

    if (!m_frame->page()
        || !m_frame->page()->javaScriptURLsAreAllowed()
        || !m_frame->document()->contentSecurityPolicy()->allowJavaScriptURLs()
        || m_frame->inViewSourceMode())
        return true;

    // We need to hold onto the Frame here because executing script can
    // destroy the frame.
    RefPtr<Frame> protector(m_frame);
    RefPtr<Document> ownerDocument(m_frame->document());

    const int javascriptSchemeLength = sizeof("javascript:") - 1;

    String decodedURL = decodeURLEscapeSequences(url.string());
    ScriptValue result = executeScript(decodedURL.substring(javascriptSchemeLength));

    // If executing script caused this frame to be removed from the page, we
    // don't want to try to replace its document!
    if (!m_frame->page())
        return true;

    String scriptResult;
#if USE(JSC)
    JSDOMWindowShell* shell = windowShell(mainThreadNormalWorld());
    JSC::ExecState* exec = shell->window()->globalExec();
    if (!result.getString(exec, scriptResult))
        return true;
#else
    if (!result.getString(scriptResult))
        return true;
#endif

    // FIXME: We should always replace the document, but doing so
    //        synchronously can cause crashes:
    //        http://bugs.webkit.org/show_bug.cgi?id=16782
    if (shouldReplaceDocumentIfJavaScriptURL == ReplaceDocumentIfJavaScriptURL) {
        // We're still in a frame, so there should be a DocumentLoader.
        ASSERT(m_frame->document()->loader());
        
        // DocumentWriter::replaceDocument can cause the DocumentLoader to get deref'ed and possible destroyed,
        // so protect it with a RefPtr.
        if (RefPtr<DocumentLoader> loader = m_frame->document()->loader())
            loader->writer()->replaceDocument(scriptResult, ownerDocument.get());
    }
    return true;
}

ScriptCachedFrameData::ScriptCachedFrameData(Frame& frame)
{
    JSLockHolder lock(JSDOMWindowBase::commonVM());

    ScriptController& scriptController = frame.script();
    Vector<JSC::Strong<JSDOMWindowShell>> windowShells = scriptController.windowShells();

    for (size_t i = 0; i < windowShells.size(); ++i) {
        JSDOMWindowShell* windowShell = windowShells[i].get();
        JSDOMWindow* window = windowShell->window();
        m_windows.add(&windowShell->world(), Strong<JSDOMWindow>(window->vm(), window));
        window->setConsoleClient(nullptr);
    }

    scriptController.attachDebugger(nullptr);
}

bool ScriptController::executeIfJavaScriptURL(const KURL& url, bool userGesture, bool replaceDocument)
{
    if (!protocolIsJavaScript(url))
        return false;

    if (m_frame->page() && !m_frame->page()->javaScriptURLsAreAllowed())
        return true;

    if (m_frame->inViewSourceMode())
        return true;

#if PLATFORM(APOLLO)
    // We should return true even though the script is not going to be executed.
    // Otherwise the frame will actually try to navigate to "javascript:"
    // which will eventually fail, but will also stop any other in progress requests in this page
    // like CSS files, images or JS files
    if (!m_frame->loader()->client()->canExecuteScriptURL())
        return true;
#endif

    const int javascriptSchemeLength = sizeof("javascript:") - 1;

    String decodedURL = decodeURLEscapeSequences(url.string());
    ScriptValue result;
    if (xssAuditor()->canEvaluateJavaScriptURL(decodedURL))
        result = executeScript(decodedURL.substring(javascriptSchemeLength), userGesture, AllowXSS);

    String scriptResult;
#if USE(JSC)
    JSDOMWindowShell* shell = windowShell(mainThreadNormalWorld());
    JSC::ExecState* exec = shell->window()->globalExec();
    if (!result.getString(exec, scriptResult))
        return true;
#else
    if (!result.getString(scriptResult))
        return true;
#endif

    // FIXME: We should always replace the document, but doing so
    //        synchronously can cause crashes:
    //        http://bugs.webkit.org/show_bug.cgi?id=16782
    if (replaceDocument) 
        m_frame->loader()->writer()->replaceDocument(scriptResult);

    return true;
}

void ScriptCachedPageData::restore(Page* page)
{
    Frame* mainFrame = page->mainFrame();

    JSLock lock(false);

    ScriptController* scriptController = mainFrame->script();
    if (scriptController->haveWindowShell()) {
        JSDOMWindowShell* windowShell = scriptController->windowShell();
        if (m_window) {
            windowShell->setWindow(m_window.get());
        } else {
            windowShell->setWindow(mainFrame->domWindow());
            scriptController->attachDebugger(page->debugger());
            windowShell->window()->setProfileGroup(page->group().identifier());
        }
    }
}

void ScriptCachedFrameData::restore(Frame* frame)
{
    Page* page = frame->page();

    JSLock lock(SilenceAssertionsOnly);

    ScriptController* scriptController = frame->script();
    if (scriptController->haveWindowShell()) {
        JSDOMWindowShell* windowShell = scriptController->windowShell();
        if (m_window) {
            windowShell->setWindow(m_window.get());
        } else {
            windowShell->setWindow(frame->domWindow());
            scriptController->attachDebugger(page->debugger());
            windowShell->window()->setProfileGroup(page->group().identifier());
        }
    }
}

JSDOMWindowShell* ScriptController::initScript(DOMWrapperWorld* world)
{
    ASSERT(!m_windowShells.contains(world));

    JSLock lock(SilenceAssertionsOnly);

    JSDOMWindowShell* windowShell = createWindowShell(world);

    windowShell->window()->updateDocument();

    if (Page* page = m_frame->page()) {
        attachDebugger(windowShell, page->debugger());
        windowShell->window()->setProfileGroup(page->group().identifier());
    }

    m_frame->loader()->dispatchDidClearWindowObjectInWorld(world);

    return windowShell;
}