1 files changed, 109 insertions, 0 deletions
diff --git a/src/qml/memory/qv4heap_p.h b/src/qml/memory/qv4heap_p.h
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+++ b/src/qml/memory/qv4heap_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** 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 The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/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 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef QV4HEAP_P_H
+#define QV4HEAP_P_H
+
+#include <QtCore/QString>
+#include <private/qv4global_p.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QV4 {
+
+namespace Heap {
+
+struct Q_QML_EXPORT Base {
+    union {
+        const ManagedVTable *vtable;
+        quintptr mm_data;
+    };
+
+    inline ReturnedValue asReturnedValue() const;
+    inline void mark(QV4::ExecutionEngine *engine);
+
+    enum {
+        MarkBit = 0x1,
+        NotInUse = 0x2,
+        PointerMask = ~0x3
+    };
+
+    ManagedVTable *gcGetVtable() const {
+        return reinterpret_cast<ManagedVTable *>(mm_data & PointerMask);
+    }
+    inline bool isMarked() const {
+        return mm_data & MarkBit;
+    }
+    inline void setMarkBit() {
+        mm_data |= MarkBit;
+    }
+    inline void clearMarkBit() {
+        mm_data &= ~MarkBit;
+    }
+
+    inline bool inUse() const {
+        return !(mm_data & NotInUse);
+    }
+
+    Base *nextFree() {
+        return reinterpret_cast<Base *>(mm_data & PointerMask);
+    }
+    void setNextFree(Base *m) {
+        mm_data = (reinterpret_cast<quintptr>(m) | NotInUse);
+    }
+
+    void *operator new(size_t, Managed *m) { return m; }
+    void *operator new(size_t, Heap::Base *m) { return m; }
+    void operator delete(void *, Heap::Base *) {}
+};
+
+template <typename T>
+struct Pointer {
+    Pointer() {}
+    Pointer(T *t) : ptr(t) {}
+
+    T *operator->() const { return static_cast<T *>(ptr); }
+    operator T *() const { return static_cast<T *>(ptr); }
+
+    Pointer &operator =(T *t) { ptr = t; return *this; }
+
+    // Use Base, not T here, to ensure T inherits from ptr
+    Base *ptr;
+};
+
+}
+
+}
+
+QT_END_NAMESPACE
+
+#endif