| /**************************************************************************** |
| ** |
| ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). |
| ** All rights reserved. |
| ** 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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| ** |
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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 |
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| ** file. Please review the following information to ensure the GNU General |
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| ** $QT_END_LICENSE$ |
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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 "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 |