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memory-manager.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

#ifndef ELF_MEMORY_MANAGER_H
#define ELF_MEMORY_MANAGER_H

#include "common/scummsys.h"

#if defined(DYNAMIC_MODULES) && defined(USE_ELF_LOADER)

#include "common/singleton.h"
#include "common/list.h"
#include "common/mutex.h"
 
/**
 * A 'foolproof' way to prevent memory fragmentation. This class is used to 
 * serve as a permanent allocation to prevent the process of loading and 
 * unloading plugins from causing heavy fragmentation.
 **/
 
#define ELFMemMan       ELFMemoryManager::instance()
 
class ELFMemoryManager : public Common::Singleton<ELFMemoryManager> {
public:     
      void trackPlugin(bool value);
      void trackAlloc(uint32 align, uint32 size);

      void allocateHeap();

      void *pluginAllocate(uint32 size);
      void *pluginAllocate(uint32 align, uint32 size);
      void pluginDeallocate(void *ptr);
      
private:
   friend class Common::Singleton<ELFMemoryManager>;

      ELFMemoryManager();
      ~ELFMemoryManager();

      void *allocateOnHeap(uint32 align, uint32 size);
      void deallocateFromHeap(void *ptr);
      
      struct Allocation {
            byte *start;
            uint32 size;
            byte *end() { return start + size; }
            Allocation(byte *a, uint32 b) : start(a), size(b) {}
      };

      // heap
      void *_heap;
      uint32 _heapAlign;                  // alignment of the heap
      uint32 _heapSize;             // size of the heap
      
      // tracking allocations
      bool _trackAllocs;            // whether we are currently tracking
      uint32 _measuredSize; 
      uint32 _measuredAlign;  
      
      // real allocations
      Common::List<Allocation> _allocList;
      uint32 _bytesAllocated;
};
 
#endif /* defined(DYNAMIC_MODULES) && defined(USE_ELF_LOADER) */

#endif /* ELF_MEMORY_MANAGER_H */

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