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77 lines
2.3 KiB
77 lines
2.3 KiB
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#ifndef ALLOC_H
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#define ALLOC_H
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#include "types.h"
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// define a consistent memory allocation interface
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// trailing void* is a pointer to some allocator state, if relevant.
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// will be unused for malloc/calloc/realloc/free, as the allocator state is internal to the OS.
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// overloads should exist which do nothing with the trailing paramter.
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typedef void* (*mallocator) (size_t, void*);
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typedef void* (*callocator) (size_t, size_t, void*);
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typedef void* (*reallocator) (void*, size_t, void*);
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typedef void (*freeer) (void*, void*);
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typedef void (*clearer) ( void*);
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typedef void (*destroyer) ( void*);
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// operating system allocator wrappers
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extern void* pMalloc(size_t size);
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extern void* pMalloc(size_t size, void* allocatorState);
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extern void* pCalloc(size_t maxNumOfElements, size_t elementSize);
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extern void* pCalloc(size_t maxNumOfElements, size_t elementSize, void* allocatorState);
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extern void* pRealloc(void* buffer, size_t newSize);
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extern void* pRealloc(void* buffer, size_t newSize, void* allocatorState);
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extern void pFree(void* ptr);
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extern void pFree(void* ptr, void* allocatorState);
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extern void pFree(const void* ptr);
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extern void pFree(const void* ptr, void* allocatorState);
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struct Allocator {
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void* state;
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mallocator mallocate;
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callocator callocate;
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reallocator reallocate;
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freeer free; // releases a specific piece of memory
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clearer clear; // should release all the memory owned by this allocator at once.
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destroyer destroy; // releases all the memory owned by this allocator, and also destroys the allocator.
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static Allocator* GetDefault();
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Allocator() {
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this->state = null;
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this->mallocate = pMalloc;
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this->callocate = pCalloc;
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this->reallocate = pRealloc;
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this->free = pFree;
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this->clear = null;
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this->destroy = null;
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}
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Allocator(mallocator mallocate, freeer free) {
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this->state = null;
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this->mallocate = mallocate;
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this->callocate = null;
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this->reallocate = null;
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this->free = free;
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this->clear = null;
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this->destroy = null;
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}
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};
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struct Arena {
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u32 bufferSizeInBytes;
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u32 index;
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u8* buffer;
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static Arena* Init(u32 sizeInBytes = 1024);
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void* Alloc(u32 sizeInBytes);
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void Clear();
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};
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#endif
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