| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtQml module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** 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 https://www.qt.io/terms-conditions. For further |
| ** information use the contact form at https://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 3 as published by the Free Software |
| ** Foundation and appearing in the file LICENSE.LGPL3 included in the |
| ** packaging of this file. Please review the following information to |
| ** ensure the GNU Lesser General Public License version 3 requirements |
| ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. |
| ** |
| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 2.0 or (at your option) the GNU General |
| ** Public license version 3 or any later version approved by the KDE Free |
| ** Qt Foundation. The licenses are as published by the Free Software |
| ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 |
| ** included in the packaging of this file. Please review the following |
| ** information to ensure the GNU General Public License requirements will |
| ** be met: https://www.gnu.org/licenses/gpl-2.0.html and |
| ** https://www.gnu.org/licenses/gpl-3.0.html. |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #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 <QtCore/qglobal.h> |
| #include <QtCore/qshareddata.h> |
| #include <QtCore/qdebug.h> |
| |
| #include <cstring> |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QQmlJS { |
| |
| class Managed; |
| |
| class MemoryPool : public QSharedData |
| { |
| MemoryPool(const MemoryPool &other); |
| void operator =(const MemoryPool &other); |
| |
| public: |
| MemoryPool() {} |
| |
| ~MemoryPool() |
| { |
| if (_blocks) { |
| for (int i = 0; i < _allocatedBlocks; ++i) { |
| if (char *b = _blocks[i]) |
| free(b); |
| } |
| |
| free(_blocks); |
| } |
| qDeleteAll(strings); |
| } |
| |
| inline void *allocate(size_t size) |
| { |
| size = (size + 7) & ~size_t(7); |
| if (Q_LIKELY(_ptr && (_ptr + size < _end))) { |
| void *addr = _ptr; |
| _ptr += size; |
| return addr; |
| } |
| return allocate_helper(size); |
| } |
| |
| void reset() |
| { |
| _blockCount = -1; |
| _ptr = _end = nullptr; |
| } |
| |
| template <typename Tp> Tp *New() { return new (this->allocate(sizeof(Tp))) Tp(); } |
| template <typename Tp, typename... Ta> Tp *New(Ta... args) |
| { return new (this->allocate(sizeof(Tp))) Tp(args...); } |
| |
| QStringRef newString(const QString &string) { |
| strings.append(new QString(string)); |
| return QStringRef(strings.last()); |
| } |
| |
| private: |
| Q_NEVER_INLINE void *allocate_helper(size_t size) |
| { |
| size_t currentBlockSize = DEFAULT_BLOCK_SIZE; |
| while (Q_UNLIKELY(size >= currentBlockSize)) |
| currentBlockSize *= 2; |
| |
| if (++_blockCount == _allocatedBlocks) { |
| if (! _allocatedBlocks) |
| _allocatedBlocks = DEFAULT_BLOCK_COUNT; |
| else |
| _allocatedBlocks *= 2; |
| |
| _blocks = reinterpret_cast<char **>(realloc(_blocks, sizeof(char *) * size_t(_allocatedBlocks))); |
| Q_CHECK_PTR(_blocks); |
| |
| for (int index = _blockCount; index < _allocatedBlocks; ++index) |
| _blocks[index] = nullptr; |
| } |
| |
| char *&block = _blocks[_blockCount]; |
| |
| if (! block) { |
| block = reinterpret_cast<char *>(malloc(currentBlockSize)); |
| Q_CHECK_PTR(block); |
| } |
| |
| _ptr = block; |
| _end = _ptr + currentBlockSize; |
| |
| void *addr = _ptr; |
| _ptr += size; |
| return addr; |
| } |
| |
| private: |
| char **_blocks = nullptr; |
| int _allocatedBlocks = 0; |
| int _blockCount = -1; |
| char *_ptr = nullptr; |
| char *_end = nullptr; |
| QVector<QString*> strings; |
| |
| enum |
| { |
| DEFAULT_BLOCK_SIZE = 8 * 1024, |
| DEFAULT_BLOCK_COUNT = 8 |
| }; |
| }; |
| |
| class Managed |
| { |
| Q_DISABLE_COPY(Managed) |
| public: |
| Managed() = default; |
| ~Managed() = default; |
| |
| void *operator new(size_t size, MemoryPool *pool) { return pool->allocate(size); } |
| void operator delete(void *) {} |
| void operator delete(void *, MemoryPool *) {} |
| }; |
| |
| } // namespace QQmlJS |
| |
| QT_END_NAMESPACE |
| |
| #endif |