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diff --git a/src/qml/qml/qqmlcleanup.cpp b/src/qml/qml/qqmlcleanup.cpp
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+++ b/src/qml/qml/qqmlcleanup.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qqmlcleanup_p.h"
+
+#include "qqmlengine_p.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+\internal
+\class QQmlCleanup
+\brief The QQmlCleanup provides a callback when a QQmlEngine is deleted. 
+
+Any object that needs cleanup to occur before the QQmlEngine's V8 engine is
+destroyed should inherit from QQmlCleanup.  The clear() virtual method will be
+called by QQmlEngine just before it destroys the context.
+*/
+
+
+/*
+Create a QQmlCleanup that is not associated with any engine.
+*/
+QQmlCleanup::QQmlCleanup()
+: prev(0), next(0), engine(0)
+{
+}
+
+/*!
+Create a QQmlCleanup for \a engine
+*/
+QQmlCleanup::QQmlCleanup(QQmlEngine *engine)
+: prev(0), next(0), engine(0)
+{
+    if (!engine)
+        return;
+
+    addToEngine(engine);
+}
+
+/*!
+Adds this object to \a engine's cleanup list.  hasEngine() must be false
+before calling this method.
+*/
+void QQmlCleanup::addToEngine(QQmlEngine *engine)
+{
+    Q_ASSERT(engine);
+    Q_ASSERT(QQmlEnginePrivate::isEngineThread(engine));
+
+    this->engine = engine;
+
+    QQmlEnginePrivate *p = QQmlEnginePrivate::get(engine);
+
+    if (p->cleanup) next = p->cleanup;
+    p->cleanup = this;
+    prev = &p->cleanup;
+    if (next) next->prev = &next;
+}
+
+/*!
+\fn bool QQmlCleanup::hasEngine() const
+
+Returns true if this QQmlCleanup is associated with an engine, otherwise false.
+*/
+
+/*!
+\internal
+*/
+QQmlCleanup::~QQmlCleanup()
+{
+    Q_ASSERT(!prev || engine);
+    Q_ASSERT(!prev || QQmlEnginePrivate::isEngineThread(engine));
+
+    if (prev) *prev = next;
+    if (next) next->prev = prev;
+    prev = 0; 
+    next = 0;
+}
+
+QT_END_NAMESPACE