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https://github.com/libretro/scummvm.git
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119 lines
3.0 KiB
C++
119 lines
3.0 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#ifndef COMMON_MEMORYPOOL_H
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#define COMMON_MEMORYPOOL_H
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#include "common/scummsys.h"
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#include "common/array.h"
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namespace Common {
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class MemoryPool {
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protected:
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MemoryPool(const MemoryPool&);
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MemoryPool& operator=(const MemoryPool&);
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struct Page {
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void *start;
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size_t numChunks;
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};
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size_t _chunkSize;
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Array<Page> _pages;
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void *_next;
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size_t _chunksPerPage;
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void allocPage();
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void addPageToPool(const Page &page);
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bool isPointerInPage(void *ptr, const Page &page);
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public:
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MemoryPool(size_t chunkSize);
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~MemoryPool();
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void *allocChunk();
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void freeChunk(void *ptr);
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void freeUnusedPages();
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size_t getChunkSize() const { return _chunkSize; }
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};
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template<size_t CHUNK_SIZE, size_t NUM_INTERNAL_CHUNKS = 32>
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class FixedSizeMemoryPool : public MemoryPool {
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private:
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enum {
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REAL_CHUNK_SIZE = (CHUNK_SIZE + sizeof(void*) - 1) & (~(sizeof(void*) - 1))
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};
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byte _storage[NUM_INTERNAL_CHUNKS * REAL_CHUNK_SIZE];
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public:
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FixedSizeMemoryPool() : MemoryPool(CHUNK_SIZE) {
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assert(REAL_CHUNK_SIZE == _chunkSize);
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// Insert some static storage
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Page internalPage = { _storage, NUM_INTERNAL_CHUNKS };
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addPageToPool(internalPage);
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}
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};
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template<size_t CHUNK_SIZE>
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class FixedSizeMemoryPool<CHUNK_SIZE,0> : public MemoryPool {
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public:
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FixedSizeMemoryPool() : MemoryPool(CHUNK_SIZE) {}
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};
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template<class T, size_t NUM_INTERNAL_CHUNKS = 32>
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class ObjectPool : public FixedSizeMemoryPool<sizeof(T), NUM_INTERNAL_CHUNKS> {
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public:
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void deleteChunk(T *ptr) {
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ptr->~T();
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freeChunk(ptr);
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}
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};
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} // End of namespace Common
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// Provide a custom placement new operator, using an arbitrary
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// MemoryPool.
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//
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// This *should* work with all C++ implementations, but may not.
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//
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// For details on using placement new for custom allocators, see e.g.
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// <http://www.parashift.com/c++-faq-lite/dtors.html#faq-11.14>
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inline void* operator new(size_t nbytes, Common::MemoryPool& pool) {
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assert(nbytes <= pool.getChunkSize());
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return pool.allocChunk();
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}
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inline void operator delete(void* p, Common::MemoryPool& pool) {
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pool.freeChunk(p);
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}
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#endif
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