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Diffstat (limited to 'src/lib/corelib/parser/qmljsmemorypool_p.h')
-rw-r--r-- | src/lib/corelib/parser/qmljsmemorypool_p.h | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/src/lib/corelib/parser/qmljsmemorypool_p.h b/src/lib/corelib/parser/qmljsmemorypool_p.h new file mode 100644 index 000000000..f644cd59d --- /dev/null +++ b/src/lib/corelib/parser/qmljsmemorypool_p.h @@ -0,0 +1,157 @@ +/**************************************************************************** +** +** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of Qt Creator. +** +** 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 Digia. For licensing terms and +** conditions see http://qt.digia.com/licensing. For further information +** use the contact form at http://qt.digia.com/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 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, Digia gives you certain additional +** rights. These rights are described in the Digia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +****************************************************************************/ + +#ifndef QMLJSMEMORYPOOL_P_H +#define QMLJSMEMORYPOOL_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 "qmljsglobal_p.h" + +#include <QtCore/qglobal.h> +#include <QtCore/qshareddata.h> +#include <QtCore/qdebug.h> + +#include <cstring> + +namespace QbsQmlJS { + +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 QbsQmlJS + +#endif |