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90 lines
2.4 KiB
C++
90 lines
2.4 KiB
C++
/****************************************************************************
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* This file is part of PPMd project *
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* Written and distributed to public domain by Dmitry Shkarin 1997, *
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* 1999-2000 *
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* Contents: interface to memory allocation routines *
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****************************************************************************/
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#if !defined(_SUBALLOC_H_)
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#define _SUBALLOC_H_
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#if defined(__GNUC__) && defined(ALLOW_MISALIGNED)
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#define RARPPM_PACK_ATTR __attribute__ ((packed))
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#else
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#define RARPPM_PACK_ATTR
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#endif /* defined(__GNUC__) */
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#ifdef ALLOW_MISALIGNED
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#pragma pack(1)
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#endif
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struct RARPPM_MEM_BLK
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{
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ushort Stamp, NU;
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RARPPM_MEM_BLK* next, * prev;
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void insertAt(RARPPM_MEM_BLK* p)
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{
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next=(prev=p)->next;
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p->next=next->prev=this;
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}
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void remove()
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{
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prev->next=next;
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next->prev=prev;
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}
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} RARPPM_PACK_ATTR;
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#ifdef ALLOW_MISALIGNED
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#ifdef _AIX
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#pragma pack(pop)
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#else
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#pragma pack()
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#endif
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#endif
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class SubAllocator
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{
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private:
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static const int N1=4, N2=4, N3=4, N4=(128+3-1*N1-2*N2-3*N3)/4;
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static const int N_INDEXES=N1+N2+N3+N4;
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struct RAR_NODE
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{
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RAR_NODE* next;
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};
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inline void InsertNode(void* p,int indx);
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inline void* RemoveNode(int indx);
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inline uint U2B(int NU);
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inline void SplitBlock(void* pv,int OldIndx,int NewIndx);
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inline void GlueFreeBlocks();
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void* AllocUnitsRare(int indx);
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inline RARPPM_MEM_BLK* MBPtr(RARPPM_MEM_BLK *BasePtr,int Items);
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long SubAllocatorSize;
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byte Indx2Units[N_INDEXES], Units2Indx[128], GlueCount;
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byte *HeapStart,*LoUnit, *HiUnit;
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struct RAR_NODE FreeList[N_INDEXES];
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public:
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SubAllocator();
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~SubAllocator() {StopSubAllocator();}
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void Clean();
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bool StartSubAllocator(int SASize);
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void StopSubAllocator();
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void InitSubAllocator();
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inline void* AllocContext();
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inline void* AllocUnits(int NU);
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inline void* ExpandUnits(void* ptr,int OldNU);
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inline void* ShrinkUnits(void* ptr,int OldNU,int NewNU);
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inline void FreeUnits(void* ptr,int OldNU);
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long GetAllocatedMemory() {return(SubAllocatorSize);}
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byte *pText, *UnitsStart,*HeapEnd,*FakeUnitsStart;
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byte *HeapStartFixed;
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void SetHeapStartFixed(byte *p) {HeapStartFixed=p;}
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};
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#endif /* !defined(_SUBALLOC_H_) */
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