Move memory management related functionality into it's own folder

Start moving the memory related functionality into it's own folder.
This will simplify refactoring of the GC related functionality later
on.

Change-Id: I70ec6f512af7a7897625afb84d914c17572b0ccd
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>

1 files changed, 109 insertions, 0 deletions

diff --git a/src/qml/memory/qv4heap_p.h b/src/qml/memory/qv4heap_p.h
new file mode 100644
index 0000000000..96d73766d0
--- /dev/null
+++ b/src/qml/memory/qv4heap_p.h
@@ -0,0 +1,109 @@
+/****************************************************************************
+**
+** 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