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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 QV4EXECUTABLEALLOCATOR_H
#define QV4EXECUTABLEALLOCATOR_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "qv4global_p.h"
#include <QMultiMap>
#include <QHash>
#include <QVector>
#include <QByteArray>
#include <QMutex>
namespace WTF {
class PageAllocation;
}
QT_BEGIN_NAMESPACE
namespace QV4 {
class Q_AUTOTEST_EXPORT ExecutableAllocator
{
public:
struct ChunkOfPages;
struct Allocation;
ExecutableAllocator();
~ExecutableAllocator();
Allocation *allocate(size_t size);
void free(Allocation *allocation);
struct Allocation
{
Allocation()
: addr(0)
, size(0)
, free(true)
, next(0)
, prev(0)
{}
void *start() const;
void invalidate() { addr = 0; }
bool isValid() const { return addr != 0; }
void deallocate(ExecutableAllocator *allocator);
private:
~Allocation() {}
friend class ExecutableAllocator;
Allocation *split(size_t dividingSize);
bool mergeNext(ExecutableAllocator *allocator);
bool mergePrevious(ExecutableAllocator *allocator);
quintptr addr;
uint size : 31; // More than 2GB of function code? nah :)
uint free : 1;
Allocation *next;
Allocation *prev;
};
// for debugging / unit-testing
int freeAllocationCount() const { return freeAllocations.count(); }
int chunkCount() const { return chunks.count(); }
struct ChunkOfPages
{
ChunkOfPages()
: pages(0)
, firstAllocation(0)
{}
~ChunkOfPages();
WTF::PageAllocation *pages;
Allocation *firstAllocation;
bool contains(Allocation *alloc) const;
};
ChunkOfPages *chunkForAllocation(Allocation *allocation) const;
private:
QMultiMap<size_t, Allocation*> freeAllocations;
QMap<quintptr, ChunkOfPages*> chunks;
mutable QMutex mutex;
};
}
QT_END_NAMESPACE
#endif // QV4EXECUTABLEALLOCATOR_H
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