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, 187 insertions, 0 deletions

diff --git a/src/qml/memory/qv4mm_p.h b/src/qml/memory/qv4mm_p.h
new file mode 100644
index 0000000000..422809ba54
--- /dev/null
+++ b/src/qml/memory/qv4mm_p.h
@@ -0,0 +1,187 @@
+/****************************************************************************
+**
+** 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 QV4GC_H
+#define QV4GC_H
+
+#include <private/qv4global_p.h>
+#include <private/qv4value_p.h>
+#include <private/qv4scopedvalue_p.h>
+
+//#define DETAILED_MM_STATS
+
+QT_BEGIN_NAMESPACE
+
+namespace QV4 {
+
+struct GCDeletable;
+
+class Q_QML_EXPORT MemoryManager
+{
+    Q_DISABLE_COPY(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(ExecutionEngine *engine);
+    ~MemoryManager();
+
+    // 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 occurrences 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; }
+
+    template<typename ManagedType>
+    inline typename ManagedType::Data *allocManaged(std::size_t size)
+    {
+        size = align(size);
+        Heap::Base *o = allocData(size);
+        o->vtable = ManagedType::staticVTable();
+        return static_cast<typename ManagedType::Data *>(o);
+    }
+
+    template <typename ManagedType>
+    typename ManagedType::Data *alloc()
+    {
+        Scope scope(engine());
+        Scoped<ManagedType> t(scope, allocManaged<ManagedType>(sizeof(typename ManagedType::Data)));
+        (void)new (t->d()) typename ManagedType::Data();
+        return t->d();
+    }
+
+    template <typename ManagedType, typename Arg1>
+    typename ManagedType::Data *alloc(Arg1 arg1)
+    {
+        Scope scope(engine());
+        Scoped<ManagedType> t(scope, allocManaged<ManagedType>(sizeof(typename ManagedType::Data)));
+        (void)new (t->d()) typename ManagedType::Data(arg1);
+        return t->d();
+    }
+
+    template <typename ManagedType, typename Arg1, typename Arg2>
+    typename ManagedType::Data *alloc(Arg1 arg1, Arg2 arg2)
+    {
+        Scope scope(engine());
+        Scoped<ManagedType> t(scope, allocManaged<ManagedType>(sizeof(typename ManagedType::Data)));
+        (void)new (t->d()) typename ManagedType::Data(arg1, arg2);
+        return t->d();
+    }
+
+    template <typename ManagedType, typename Arg1, typename Arg2, typename Arg3>
+    typename ManagedType::Data *alloc(Arg1 arg1, Arg2 arg2, Arg3 arg3)
+    {
+        Scope scope(engine());
+        Scoped<ManagedType> t(scope, allocManaged<ManagedType>(sizeof(typename ManagedType::Data)));
+        (void)new (t->d()) typename ManagedType::Data(arg1, arg2, arg3);
+        return t->d();
+    }
+
+    template <typename ManagedType, typename Arg1, typename Arg2, typename Arg3, typename Arg4>
+    typename ManagedType::Data *alloc(Arg1 arg1, Arg2 arg2, Arg3 arg3, Arg4 arg4)
+    {
+        Scope scope(engine());
+        Scoped<ManagedType> t(scope, allocManaged<ManagedType>(sizeof(typename ManagedType::Data)));
+        (void)new (t->d()) typename ManagedType::Data(arg1, arg2, arg3, arg4);
+        return t->d();
+    }
+
+    template <typename ManagedType, typename Arg1, typename Arg2, typename Arg3, typename Arg4, typename Arg5>
+    typename ManagedType::Data *alloc(Arg1 arg1, Arg2 arg2, Arg3 arg3, Arg4 arg4, Arg5 arg5)
+    {
+        Scope scope(engine());
+        Scoped<ManagedType> t(scope, allocManaged<ManagedType>(sizeof(typename ManagedType::Data)));
+        (void)new (t->d()) typename ManagedType::Data(arg1, arg2, arg3, arg4, arg5);
+        return t->d();
+    }
+
+    bool isGCBlocked() const;
+    void setGCBlocked(bool blockGC);
+    void runGC();
+
+    ExecutionEngine *engine() const;
+
+    void dumpStats() const;
+
+    void registerDeletable(GCDeletable *d);
+
+    size_t getUsedMem() const;
+    size_t getAllocatedMem() const;
+    size_t getLargeItemsMem() const;
+
+protected:
+    /// expects size to be aligned
+    // TODO: try to inline
+    Heap::Base *allocData(std::size_t size);
+
+#ifdef DETAILED_MM_STATS
+    void willAllocate(std::size_t size);
+#endif // DETAILED_MM_STATS
+
+private:
+    void collectFromJSStack() const;
+    void mark();
+    void sweep(bool lastSweep = false);
+
+protected:
+    QScopedPointer<Data> m_d;
+public:
+    PersistentValueStorage *m_persistentValues;
+    PersistentValueStorage *m_weakValues;
+};
+
+}
+
+QT_END_NAMESPACE
+
+#endif // QV4GC_H