third_party/WebKit/Source/core/frame/DOMWindowProperty.cpp

/*
 * Copyright (C) 2011 Google, Inc. All Rights Reserved.
 * Copyright (C) 2012 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 met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``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 APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 */

#include "core/frame/DOMWindowProperty.h"

#include "core/frame/LocalDOMWindow.h"
#include "core/frame/LocalFrame.h"

namespace blink {

DOMWindowProperty::DOMWindowProperty(LocalFrame* frame)
    : m_frame(frame)
#if !ENABLE(OILPAN)
    , m_associatedDOMWindow(nullptr)
#endif
{
    // FIXME: For now it *is* acceptable for a DOMWindowProperty to be created with a null frame.
    // See fast/dom/navigator-detached-no-crash.html for the recipe.
    // We should fix that.  <rdar://problem/11567132>
    if (m_frame) {
        // FIXME: Need to figure out what to do with DOMWindowProperties on
        // remote DOM windows.
#if ENABLE(OILPAN)
        m_frame->localDOMWindow()->registerProperty(this);
#else
        m_associatedDOMWindow = m_frame->localDOMWindow();
        m_associatedDOMWindow->registerProperty(this);
#endif
    }
}

#if !ENABLE(OILPAN)
DOMWindowProperty::~DOMWindowProperty()
{
    if (m_associatedDOMWindow)
        m_associatedDOMWindow->unregisterProperty(this);
}
#endif

void DOMWindowProperty::willDestroyGlobalObjectInFrame()
{
    // If the property is getting this callback it must have been
    // created with a LocalFrame and it should still have it.
    ASSERT(m_frame);
    m_frame = nullptr;

#if !ENABLE(OILPAN)
    // LocalDOMWindow will along with notifying DOMWindowProperty objects of
    // impending destruction, unilaterally clear out its registered set.
    // Consequently, no explicit unregisteration required by DOMWindowProperty;
    // here or when destructed.
    ASSERT(m_associatedDOMWindow);
    m_associatedDOMWindow = nullptr;
#endif
}

void DOMWindowProperty::willDetachGlobalObjectFromFrame()
{
    // If the property is getting this callback it must have been
    // created with a LocalFrame and it should still have it.
    ASSERT(m_frame);
#if !ENABLE(OILPAN)
    // Ditto for its associated LocalDOMWindow.
    ASSERT(m_associatedDOMWindow);
#endif
}

DEFINE_TRACE(DOMWindowProperty)
{
    visitor->trace(m_frame);
}

} // namespace blink