/**************************************************************************** | |
** | |
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). | |
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** Contact: Nokia Corporation (qt-info@nokia.com) | |
** | |
** This file is part of the QtDeclarative module of the Qt Toolkit. | |
** | |
** $QT_BEGIN_LICENSE:LGPL$ | |
** GNU Lesser General Public License Usage | |
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** file. Please review the following information to ensure the GNU Lesser | |
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** rights. These rights are described in the Nokia Qt LGPL Exception | |
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. | |
** | |
** GNU General Public License Usage | |
** Alternatively, this file may be used under the terms of the GNU General | |
** Public License version 3.0 as published by the Free Software Foundation | |
** and appearing in the file LICENSE.GPL included in the packaging of this | |
** file. Please review the following information to ensure the GNU General | |
** Public License version 3.0 requirements will be met: | |
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****************************************************************************/ | |
#ifndef QDECLARATIVEJSMEMORYPOOL_P_H | |
#define QDECLARATIVEJSMEMORYPOOL_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 "private/qdeclarativejsglobal_p.h" | |
#include <QtCore/qglobal.h> | |
#include <QtCore/qshareddata.h> | |
#include <string.h> | |
QT_QML_BEGIN_NAMESPACE | |
namespace QDeclarativeJS { | |
class QML_PARSER_EXPORT MemoryPool : public QSharedData | |
{ | |
public: | |
enum { maxBlockCount = -1 }; | |
enum { defaultBlockSize = 1 << 12 }; | |
MemoryPool() { | |
m_blockIndex = maxBlockCount; | |
m_currentIndex = 0; | |
m_storage = 0; | |
m_currentBlock = 0; | |
m_currentBlockSize = 0; | |
} | |
virtual ~MemoryPool() { | |
for (int index = 0; index < m_blockIndex + 1; ++index) | |
qFree(m_storage[index]); | |
qFree(m_storage); | |
} | |
char *allocate(int bytes) { | |
bytes += (8 - bytes) & 7; // ensure multiple of 8 bytes (maintain alignment) | |
if (m_currentBlock == 0 || m_currentBlockSize < m_currentIndex + bytes) { | |
++m_blockIndex; | |
m_currentBlockSize = defaultBlockSize << m_blockIndex; | |
m_storage = reinterpret_cast<char**>(qRealloc(m_storage, sizeof(char*) * (1 + m_blockIndex))); | |
m_currentBlock = m_storage[m_blockIndex] = reinterpret_cast<char*>(qMalloc(m_currentBlockSize)); | |
::memset(m_currentBlock, 0, m_currentBlockSize); | |
m_currentIndex = (8 - quintptr(m_currentBlock)) & 7; // ensure first chunk is 64-bit aligned | |
Q_ASSERT(m_currentIndex + bytes <= m_currentBlockSize); | |
} | |
char *p = reinterpret_cast<char *> | |
(m_currentBlock + m_currentIndex); | |
m_currentIndex += bytes; | |
return p; | |
} | |
int bytesAllocated() const { | |
int bytes = 0; | |
for (int index = 0; index < m_blockIndex; ++index) | |
bytes += (defaultBlockSize << index); | |
bytes += m_currentIndex; | |
return bytes; | |
} | |
private: | |
int m_blockIndex; | |
int m_currentIndex; | |
char *m_currentBlock; | |
int m_currentBlockSize; | |
char **m_storage; | |
private: | |
Q_DISABLE_COPY(MemoryPool) | |
}; | |
} // namespace QDeclarativeJS | |
QT_QML_END_NAMESPACE | |
#endif |