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backends/plugins/elf/memory-manager.h

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+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#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 */