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61 lines
2.5 KiB
C
61 lines
2.5 KiB
C
/*
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* SubAllocator.h
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*
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* Copyright (c) 2017-present, MacPaw Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#ifndef __PPMD_SUB_ALLOCATOR_H__
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#define __PPMD_SUB_ALLOCATOR_H__
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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typedef struct PPMdSubAllocator PPMdSubAllocator;
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struct PPMdSubAllocator
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{
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void (*Init)(PPMdSubAllocator *self);
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uint32_t (*AllocContext)(PPMdSubAllocator *self);
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uint32_t (*AllocUnits)(PPMdSubAllocator *self,int num); // 1 unit == 12 bytes, NU <= 128
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uint32_t (*ExpandUnits)(PPMdSubAllocator *self,uint32_t oldoffs,int oldnum);
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uint32_t (*ShrinkUnits)(PPMdSubAllocator *self,uint32_t oldoffs,int oldnum,int newnum);
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void (*FreeUnits)(PPMdSubAllocator *self,uint32_t offs,int num);
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};
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static inline void InitSubAllocator(PPMdSubAllocator *self) { self->Init(self); };
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static inline uint32_t AllocContext(PPMdSubAllocator *self) { return self->AllocContext(self); }
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static inline uint32_t AllocUnits(PPMdSubAllocator *self,int num) { return self->AllocUnits(self,num); }
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static inline uint32_t ExpandUnits(PPMdSubAllocator *self,uint32_t oldoffs,int oldnum) { return self->ExpandUnits(self,oldoffs,oldnum); }
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static inline uint32_t ShrinkUnits(PPMdSubAllocator *self,uint32_t oldoffs,int oldnum,int newnum) { return self->ShrinkUnits(self,oldoffs,oldnum,newnum); }
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static inline void FreeUnits(PPMdSubAllocator *self,uint32_t offs,int num) { return self->FreeUnits(self,offs,num); }
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// TODO: Keep pointers as pointers on 32 bit, and offsets on 64 bit.
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static inline void *OffsetToPointer(void *base,uint32_t offset)
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{
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if(!offset) return NULL;
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return ((uint8_t *)base)+offset;
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}
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static inline uint32_t PointerToOffset(void *base,void *pointer)
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{
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if(!pointer) return 0;
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return (uint32_t)(((uintptr_t)pointer)-(uintptr_t)base);
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}
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#endif
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