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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 QV4GC_H
#define QV4GC_H
#include "qv4global_p.h"
#include "qv4value_inl_p.h"
#include "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
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