webkit/src/WebCore/bindings/js/ScriptCachedFrameData.cpp

/*
 * Copyright (c) 2008, Google Inc. All rights reserved.
 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 */

#include "config.h"
#include "ScriptCachedFrameData.h"

#include "Frame.h"
#include "GCController.h"
#include "Page.h"
#include "PageGroup.h"
#include <runtime/JSLock.h>
#include "ScriptController.h"

using namespace JSC;

namespace WebCore {

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

    ScriptController* scriptController = frame->script();
    // FIXME: explicitly save and restore isolated worlds' global objects when using the back/forward cache. <rdar://problem/7328111>
    if (JSDOMWindowShell* windowShell = scriptController->existingWindowShell(mainThreadNormalWorld())) {
        m_window = windowShell->window();
        scriptController->attachDebugger(0);
    }
}

DOMWindow* ScriptCachedFrameData::domWindow() const {
    return m_window ? m_window->impl() : 0;
}

ScriptCachedFrameData::~ScriptCachedFrameData()
{
    clear();
}

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

    JSLock lock(SilenceAssertionsOnly);

    ScriptController* scriptController = frame->script();
    // FIXME: explicitly save and restore isolated worlds' global objects when using the back/forward cache. <rdar://problem/7328111>
    if (JSDOMWindowShell* windowShell = scriptController->existingWindowShell(mainThreadNormalWorld())) {
        if (m_window)
            windowShell->setWindow(m_window.get());
        else {
            windowShell->setWindow(frame->domWindow());
            scriptController->attachDebugger(page->debugger());
            windowShell->window()->setProfileGroup(page->group().identifier());
        }
    }
}

void ScriptCachedFrameData::clear()
{
    JSLock lock(SilenceAssertionsOnly);

    if (m_window) {
        m_window = 0;
        gcController().garbageCollectSoon();
    }
}

} // namespace WebCore