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Diffstat (limited to 'src/declarative/qml/parser/javascriptmemorypool_p.h')
| -rw-r--r-- | src/declarative/qml/parser/javascriptmemorypool_p.h | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/src/declarative/qml/parser/javascriptmemorypool_p.h b/src/declarative/qml/parser/javascriptmemorypool_p.h new file mode 100644 index 0000000..cff7677 --- /dev/null +++ b/src/declarative/qml/parser/javascriptmemorypool_p.h @@ -0,0 +1,130 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the QtScript module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** 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 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, 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: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef JAVASCRIPTMEMORYPOOL_P_H +#define JAVASCRIPTMEMORYPOOL_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 <QtCore/qglobal.h> +#include <QtCore/qshareddata.h> +#include <string.h> + +QT_BEGIN_NAMESPACE + +namespace JavaScript { + +class 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 JavaScript + +QT_END_NAMESPACE + +#endif |