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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 QQMLJSMEMORYPOOL_P_H
#define QQMLJSMEMORYPOOL_P_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 "qqmljsglobal_p.h"
#include <QtCore/qglobal.h>
#include <QtCore/qshareddata.h>
#include <QtCore/qdebug.h>
#include <cstring>
QT_QML_BEGIN_NAMESPACE
namespace QQmlJS {
class QML_PARSER_EXPORT MemoryPool : public QSharedData
{
MemoryPool(const MemoryPool &other);
void operator =(const MemoryPool &other);
public:
MemoryPool()
: _blocks(0),
_allocatedBlocks(0),
_blockCount(-1),
_ptr(0),
_end(0)
{ }
~MemoryPool()
{
if (_blocks) {
for (int i = 0; i < _allocatedBlocks; ++i) {
if (char *b = _blocks[i])
free(b);
}
free(_blocks);
}
}
inline void *allocate(size_t size)
{
size = (size + 7) & ~7;
if (_ptr && (_ptr + size < _end)) {
void *addr = _ptr;
_ptr += size;
return addr;
}
return allocate_helper(size);
}
void reset()
{
_blockCount = -1;
_ptr = _end = 0;
}
private:
void *allocate_helper(size_t size)
{
Q_ASSERT(size < BLOCK_SIZE);
if (++_blockCount == _allocatedBlocks) {
if (! _allocatedBlocks)
_allocatedBlocks = DEFAULT_BLOCK_COUNT;
else
_allocatedBlocks *= 2;
_blocks = (char **) realloc(_blocks, sizeof(char *) * _allocatedBlocks);
for (int index = _blockCount; index < _allocatedBlocks; ++index)
_blocks[index] = 0;
}
char *&block = _blocks[_blockCount];
if (! block)
block = (char *) malloc(BLOCK_SIZE);
_ptr = block;
_end = _ptr + BLOCK_SIZE;
void *addr = _ptr;
_ptr += size;
return addr;
}
private:
char **_blocks;
int _allocatedBlocks;
int _blockCount;
char *_ptr;
char *_end;
enum
{
BLOCK_SIZE = 8 * 1024,
DEFAULT_BLOCK_COUNT = 8
};
};
class QML_PARSER_EXPORT Managed
{
Managed(const Managed &other);
void operator = (const Managed &other);
public:
Managed() {}
~Managed() {}
void *operator new(size_t size, MemoryPool *pool) { return pool->allocate(size); }
void operator delete(void *) {}
void operator delete(void *, MemoryPool *) {}
};
} // namespace QQmlJS
QT_QML_END_NAMESPACE
#endif
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