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diff --git a/src/script/api/qscriptstring_p.h b/src/script/api/qscriptstring_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtScript module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL-ONLY$
+** 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.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSCRIPTSTRING_P_H
+#define QSCRIPTSTRING_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qobjectdefs.h>
+
+#include "Identifier.h"
+
+QT_BEGIN_NAMESPACE
+
+class QScriptEnginePrivate;
+class QScriptStringPrivate
+{
+public:
+    enum AllocationType {
+        StackAllocated,
+        HeapAllocated
+    };
+
+    inline QScriptStringPrivate(QScriptEnginePrivate *engine, const JSC::Identifier &id,
+                                AllocationType type);
+    inline ~QScriptStringPrivate();
+    static inline void init(QScriptString &q, QScriptStringPrivate *d);
+
+    static inline QScriptStringPrivate *get(const QScriptString &q);
+
+    inline void detachFromEngine();
+
+    static inline bool isValid(const QScriptString &q);
+
+    QBasicAtomicInt ref;
+    QScriptEnginePrivate *engine;
+    JSC::Identifier identifier;
+    AllocationType type;
+
+    // linked list of engine's script values
+    QScriptStringPrivate *prev;
+    QScriptStringPrivate *next;
+};
+
+inline QScriptStringPrivate::QScriptStringPrivate(QScriptEnginePrivate *e, const JSC::Identifier &id,
+                                                  AllocationType tp)
+    : engine(e), identifier(id), type(tp), prev(0), next(0)
+{
+    ref = 0;
+}
+
+inline QScriptStringPrivate::~QScriptStringPrivate()
+{
+}
+
+inline void QScriptStringPrivate::init(QScriptString &q, QScriptStringPrivate *d)
+{
+    q.d_ptr = d;
+}
+
+inline QScriptStringPrivate *QScriptStringPrivate::get(const QScriptString &q)
+{
+    return const_cast<QScriptStringPrivate*>(q.d_func());
+}
+
+inline void QScriptStringPrivate::detachFromEngine()
+{
+    engine = 0;
+    identifier = JSC::Identifier();
+}
+
+inline bool QScriptStringPrivate::isValid(const QScriptString &q)
+{
+    return (q.d_ptr && q.d_ptr->engine);
+}
+
+QT_END_NAMESPACE
+
+#endif