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diff --git a/src/qml/qml/v4vm/qv4mm_p.h b/src/qml/qml/v4vm/qv4mm_p.h
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+++ b/src/qml/qml/v4vm/qv4mm_p.h
@@ -0,0 +1,155 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the V4VM module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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, Digia gives you certain additional
+** rights.  These rights are described in the Digia 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QV4GC_H
+#define QV4GC_H
+
+#include "qv4global_p.h"
+#include "qv4context_p.h"
+
+#include <QScopedPointer>
+
+//#define DETAILED_MM_STATS
+
+QT_BEGIN_NAMESPACE
+
+namespace QQmlJS {
+namespace VM {
+
+struct ExecutionEngine;
+struct ExecutionContext;
+struct Managed;
+
+class Q_V4_EXPORT MemoryManager
+{
+    MemoryManager(const MemoryManager &);
+    MemoryManager &operator=(const MemoryManager&);
+
+public:
+    struct Data;
+
+    class GCBlocker
+    {
+    public:
+        GCBlocker(MemoryManager *mm)
+            : mm(mm)
+            , wasBlocked(mm->isGCBlocked())
+        {
+            mm->setGCBlocked(true);
+        }
+
+        ~GCBlocker()
+        {
+            mm->setGCBlocked(wasBlocked);
+        }
+
+    private:
+        MemoryManager *mm;
+        bool wasBlocked;
+    };
+
+public:
+    MemoryManager();
+    ~MemoryManager();
+
+    void protect(Managed *m);
+    void unprotect(Managed *m);
+
+    // TODO: this is only for 64bit (and x86 with SSE/AVX), so exend it for other architectures to be slightly more efficient (meaning, align on 8-byte boundaries).
+    // Note: all occurances of "16" in alloc/dealloc are also due to the alignment.
+    static inline std::size_t align(std::size_t size)
+    { return (size + 15) & ~0xf; }
+
+    inline Managed *allocManaged(std::size_t size)
+    {
+        size = align(size);
+        Managed *o = alloc(size);
+        return o;
+    }
+
+    ExecutionContext *allocContext(uint size);
+
+    bool isGCBlocked() const;
+    void setGCBlocked(bool blockGC);
+    void runGC();
+
+    void setEnableGC(bool enableGC);
+    void setExecutionEngine(ExecutionEngine *engine);
+
+    void dumpStats() const;
+
+protected:
+    /// expects size to be aligned
+    // TODO: try to inline
+    Managed *alloc(std::size_t size);
+
+    ExecutionEngine *engine() const;
+
+#ifdef DETAILED_MM_STATS
+    void willAllocate(std::size_t size);
+#endif // DETAILED_MM_STATS
+
+private:
+    void collectFromStack() const;
+    void mark();
+    std::size_t sweep();
+    std::size_t sweep(char *chunkStart, std::size_t chunkSize, size_t size);
+
+protected:
+    QScopedPointer<Data> m_d;
+    ExecutionContext *m_contextList;
+};
+
+inline ExecutionContext *MemoryManager::allocContext(uint size)
+{
+    ExecutionContext *newContext = (ExecutionContext *)malloc(size);
+    newContext->next = m_contextList;
+    m_contextList = newContext;
+    return newContext;
+}
+
+
+} // namespace VM
+} // namespace QQmlJS
+
+QT_END_NAMESPACE
+
+#endif // QV4GC_H