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https://github.com/dwhinham/mt32-pi.git
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5d39db9682
Add a Doom-style "zone" memory allocator that can be used instead of malloc()/realloc()/free() for FluidSynth. This removes the need to reconfigure the Circle heap and could reduce fragmentation caused by repeated loading/unloading of SoundFonts.
87 lines
2.2 KiB
C++
87 lines
2.2 KiB
C++
//
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// zoneallocator.h
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//
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// mt32-pi - A bare-metal Roland MT-32 emulator for Raspberry Pi
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// Copyright (C) 2020 Dale Whinham <daleyo@gmail.com>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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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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//
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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, see <http://www.gnu.org/licenses/>.
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//
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#ifndef _zoneallocator_h
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#define _zoneallocator_h
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#include <circle/types.h>
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// Block allocation tags
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enum TZoneTag : u32
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{
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Free = 0,
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Uncategorized = 1,
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FluidSynth
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};
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class CZoneAllocator
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{
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public:
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CZoneAllocator();
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~CZoneAllocator();
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// Allocator interface
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bool Initialize();
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void* Alloc(size_t nSize, TZoneTag Tag);
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void* Realloc(void* pPtr, size_t nSize, TZoneTag Tag);
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void Free(void* pPtr);
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size_t GetAllocCount() const { return m_nAllocCount; }
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void FreeTag(u32 nTag);
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void Clear();
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void Dump() const;
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static CZoneAllocator* Get() { return s_pThis; }
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private:
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// Memory block header/linked list
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struct TBlock
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{
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size_t nSize; // 32bit: 4 bytes | 64bit: 8 bytes
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TBlock* pNext; // 8 bytes | 16 bytes
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TBlock* pPrevious; // 12 bytes | 24 bytes
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TZoneTag Tag; // 16 bytes | 28 bytes
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u32 nMagic; // 20 bytes | 32 bytes
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#if AARCH == 32
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u8 Padding[12]; // 32 bytes |
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#endif
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};
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// Constants
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static constexpr u32 BlockMagic = 0xDA1EDEAD;
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static constexpr size_t MinFragmentSize = 16;
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inline u32& GetEndMagic(TBlock* pBlock) const
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{
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return *reinterpret_cast<u32*>(reinterpret_cast<u8*>(pBlock) + pBlock->nSize - sizeof(BlockMagic));
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}
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void* m_pHeap;
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size_t m_nHeapSize;
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TBlock m_MainBlock;
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TBlock* m_pCurrentBlock;
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size_t m_nAllocCount;
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static CZoneAllocator* s_pThis;
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};
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#endif
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