Source/WebCore/bindings/js/JSDOMWindowBase.cpp

/*
 *  Copyright (C) 2000 Harri Porten (porten@kde.org)
 *  Copyright (C) 2006 Jon Shier (jshier@iastate.edu)
 *  Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reseved.
 *  Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
 *  USA
 */

#include "config.h"
#include "JSDOMWindowBase.h"

#include "Chrome.h"
#include "Console.h"
#include "DOMWindow.h"
#include "Frame.h"
#include "InspectorController.h"
#include "JSDOMGlobalObjectTask.h"
#include "JSDOMWindowCustom.h"
#include "JSNode.h"
#include "Logging.h"
#include "Page.h"
#include "ScriptController.h"
#include "SecurityOrigin.h"
#include "Settings.h"
#include "WebCoreJSClientData.h"
#include <runtime/Microtask.h>
#include <wtf/MainThread.h>

#if PLATFORM(IOS)
#include "ChromeClient.h"
#include "WebSafeGCActivityCallbackIOS.h"
#include "WebSafeIncrementalSweeperIOS.h"
#endif

using namespace JSC;

namespace WebCore {

static bool shouldAllowAccessFrom(const JSGlobalObject* thisObject, ExecState* exec)
{
    return BindingSecurity::shouldAllowAccessToDOMWindow(exec, asJSDOMWindow(thisObject)->impl());
}

const ClassInfo JSDOMWindowBase::s_info = { "Window", &JSDOMGlobalObject::s_info, 0, 0, CREATE_METHOD_TABLE(JSDOMWindowBase) };

const GlobalObjectMethodTable JSDOMWindowBase::s_globalObjectMethodTable = { &shouldAllowAccessFrom, &supportsProfiling, &supportsRichSourceInfo, &shouldInterruptScript, &javaScriptExperimentsEnabled, &queueTaskToEventLoop, &shouldInterruptScriptBeforeTimeout };

JSDOMWindowBase::JSDOMWindowBase(VM& vm, Structure* structure, PassRefPtr<DOMWindow> window, JSDOMWindowShell* shell)
    : JSDOMGlobalObject(vm, structure, &shell->world(), &s_globalObjectMethodTable)
    , m_impl(window)
    , m_shell(shell)
{
}

void JSDOMWindowBase::finishCreation(VM& vm, JSDOMWindowShell* shell)
{
    Base::finishCreation(vm, shell);
    ASSERT(inherits(info()));

    GlobalPropertyInfo staticGlobals[] = {
        GlobalPropertyInfo(vm.propertyNames->document, jsNull(), DontDelete | ReadOnly),
        GlobalPropertyInfo(vm.propertyNames->window, m_shell, DontDelete | ReadOnly)
    };
    
    addStaticGlobals(staticGlobals, WTF_ARRAY_LENGTH(staticGlobals));
}

void JSDOMWindowBase::destroy(JSCell* cell)
{
    static_cast<JSDOMWindowBase*>(cell)->JSDOMWindowBase::~JSDOMWindowBase();
}

void JSDOMWindowBase::updateDocument()
{
    ASSERT(m_impl->document());
    ExecState* exec = globalExec();
    symbolTablePutWithAttributes(this, exec->vm(), exec->vm().propertyNames->document, toJS(exec, this, m_impl->document()), DontDelete | ReadOnly);
}

ScriptExecutionContext* JSDOMWindowBase::scriptExecutionContext() const
{
    return m_impl->document();
}

void JSDOMWindowBase::printErrorMessage(const String& message) const
{
    printErrorMessageForFrame(impl().frame(), message);
}

bool JSDOMWindowBase::supportsProfiling(const JSGlobalObject* object)
{
#if !ENABLE(INSPECTOR)
    UNUSED_PARAM(object);
    return false;
#else
    const JSDOMWindowBase* thisObject = static_cast<const JSDOMWindowBase*>(object);
    Frame* frame = thisObject->impl().frame();
    if (!frame)
        return false;

    Page* page = frame->page();
    if (!page)
        return false;

#if ENABLE(INSPECTOR)
    return page->inspectorController().profilerEnabled();
#else
    return false;
#endif // ENABLE(INSPECTOR)
#endif
}

bool JSDOMWindowBase::supportsRichSourceInfo(const JSGlobalObject* object)
{
#if !ENABLE(INSPECTOR)
    UNUSED_PARAM(object);
    return false;
#else
    const JSDOMWindowBase* thisObject = static_cast<const JSDOMWindowBase*>(object);
    Frame* frame = thisObject->impl().frame();
    if (!frame)
        return false;

    Page* page = frame->page();
    if (!page)
        return false;

    bool enabled = page->inspectorController().enabled();
    ASSERT(enabled || !thisObject->debugger());
    ASSERT(enabled || !supportsProfiling(thisObject));
    return enabled;
#endif
}

static inline bool shouldInterruptScriptToPreventInfiniteRecursionWhenClosingPage(Page* page)
{
    // See <rdar://problem/5479443>. We don't think that page can ever be NULL
    // in this case, but if it is, we've gotten into a state where we may have
    // hung the UI, with no way to ask the client whether to cancel execution.
    // For now, our solution is just to cancel execution no matter what,
    // ensuring that we never hang. We might want to consider other solutions
    // if we discover problems with this one.
    ASSERT(page);
    return !page;
}

bool JSDOMWindowBase::shouldInterruptScript(const JSGlobalObject* object)
{
    const JSDOMWindowBase* thisObject = static_cast<const JSDOMWindowBase*>(object);
    ASSERT(thisObject->impl().frame());
    Page* page = thisObject->impl().frame()->page();
    return shouldInterruptScriptToPreventInfiniteRecursionWhenClosingPage(page) || page->chrome().shouldInterruptJavaScript();
}

bool JSDOMWindowBase::shouldInterruptScriptBeforeTimeout(const JSGlobalObject* object)
{
    const JSDOMWindowBase* thisObject = static_cast<const JSDOMWindowBase*>(object);
    ASSERT(thisObject->impl().frame());
    Page* page = thisObject->impl().frame()->page();

    if (shouldInterruptScriptToPreventInfiniteRecursionWhenClosingPage(page))
        return true;

#if PLATFORM(IOS)
    if (page->chrome().client().isStopping())
        return true;
#endif

    return JSGlobalObject::shouldInterruptScriptBeforeTimeout(object);
}

bool JSDOMWindowBase::javaScriptExperimentsEnabled(const JSGlobalObject* object)
{
    const JSDOMWindowBase* thisObject = static_cast<const JSDOMWindowBase*>(object);
    Frame* frame = thisObject->impl().frame();
    if (!frame)
        return false;
    return frame->settings().javaScriptExperimentsEnabled();
}

void JSDOMWindowBase::queueTaskToEventLoop(const JSGlobalObject* object, PassRefPtr<Microtask> task)
{
    const JSDOMWindowBase* thisObject = static_cast<const JSDOMWindowBase*>(object);
    thisObject->scriptExecutionContext()->postTask(JSGlobalObjectTask::create((JSDOMWindowBase*)thisObject, task));
}

void JSDOMWindowBase::willRemoveFromWindowShell()
{
    setCurrentEvent(0);
}

JSDOMWindowShell* JSDOMWindowBase::shell() const
{
    return m_shell;
}

VM* JSDOMWindowBase::commonVM()
{
    ASSERT(isMainThread());

#if !PLATFORM(IOS)
    static VM* vm = 0;
#else
    VM*& vm = commonVMInternal();
#endif
    if (!vm) {
        ScriptController::initializeThreading();
        vm = VM::createLeaked(LargeHeap).leakRef();
#if PLATFORM(IOS)
        PassOwnPtr<WebSafeGCActivityCallback> activityCallback = WebSafeGCActivityCallback::create(&vm->heap);
        vm->heap.setActivityCallback(activityCallback);
        PassOwnPtr<WebSafeIncrementalSweeper> incrementalSweeper = WebSafeIncrementalSweeper::create(&vm->heap);
        vm->heap.setIncrementalSweeper(incrementalSweeper);
        vm->makeUsableFromMultipleThreads();
        vm->heap.machineThreads().addCurrentThread();
#else
        vm->exclusiveThread = currentThread();
#endif // !PLATFORM(IOS)
        initNormalWorldClientData(vm);
    }

    return vm;
}

#if PLATFORM(IOS)
bool JSDOMWindowBase::commonVMExists()
{
    return commonVMInternal();
}

VM*& JSDOMWindowBase::commonVMInternal()
{
    ASSERT(isMainThread());
    static VM* commonVM;
    return commonVM;
}
#endif

// JSDOMGlobalObject* is ignored, accessing a window in any context will
// use that DOMWindow's prototype chain.
JSValue toJS(ExecState* exec, JSDOMGlobalObject*, DOMWindow* domWindow)
{
    return toJS(exec, domWindow);
}

JSValue toJS(ExecState* exec, DOMWindow* domWindow)
{
    if (!domWindow)
        return jsNull();
    Frame* frame = domWindow->frame();
    if (!frame)
        return jsNull();
    return frame->script().windowShell(currentWorld(exec));
}

JSDOMWindow* toJSDOMWindow(Frame* frame, DOMWrapperWorld& world)
{
    if (!frame)
        return 0;
    return frame->script().windowShell(world)->window();
}

JSDOMWindow* toJSDOMWindow(JSValue value)
{
    if (!value.isObject())
        return 0;
    const ClassInfo* classInfo = asObject(value)->classInfo();
    if (classInfo == JSDOMWindow::info())
        return jsCast<JSDOMWindow*>(asObject(value));
    if (classInfo == JSDOMWindowShell::info())
        return jsCast<JSDOMWindowShell*>(asObject(value))->window();
    return 0;
}

} // namespace WebCore