92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
/*
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* Mr. 4th Dimention - Allen Webster
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*
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* 01.14.2017
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*
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*
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*
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*/
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// TOP
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#ifndef FED_DEBUG_MEM_H
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#define FED_DEBUG_MEM_H
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// NOTE(allen): Prevent any future instantiation of 4coder_mem.h
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#define FCODER_MEM_H
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#if !defined(OS_PAGE_SIZE)
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#define OS_PAGE_SIZE 4096
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#endif
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struct Debug_GM{
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System_Functions *system;
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};
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static void
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debug_gm_open(System_Functions *system, Debug_GM *general, void *memory, i32 size){
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general->system = system;
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}
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static void*
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debug_gm_allocate(Debug_GM *general, int32_t size){
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System_Functions *system = general->system;
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local_persist u32 page_round_val = OS_PAGE_SIZE-1;
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int32_t page_rounded_size = (size + page_round_val) & (~page_round_val);
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u8 *result = (u8*)system->memory_allocate(page_rounded_size + OS_PAGE_SIZE);
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system->memory_set_protection(result + page_rounded_size, OS_PAGE_SIZE, 0);
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local_persist u32 align_round_val = PREFERRED_ALIGNMENT-1;
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int32_t align_rounded_size = (size + align_round_val) & (~align_round_val);
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int32_t offset = page_rounded_size - align_rounded_size;
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return(result + offset);
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}
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static void
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debug_gm_free(Debug_GM *general, void *memory){
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u8 *ptr = (u8*)memory;
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umem val = *(umem*)(&ptr);
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val &= ~(0xFFF);
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ptr = *(u8**)(&val);
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Assert(sizeof(val) == sizeof(ptr));
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System_Functions *system = general->system;
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system->memory_free(ptr, 0);
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}
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static void*
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debug_gm_reallocate(Debug_GM *general, void *old, int32_t old_size, int32_t size){
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void *result = debug_gm_allocate(general, size);
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memcpy(result, old, Min(old_size, size));
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debug_gm_free(general, old);
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return(result);
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}
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inline void*
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debug_gm_reallocate_nocopy(Debug_GM *general, void *old, int32_t size){
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debug_gm_free(general, old);
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void *result = debug_gm_allocate(general, size);
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return(result);
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}
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// Redefine the normal general memory names to go to these debug names.
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#define General_Memory Debug_GM
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struct Debug_Mem_Options{
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Partition part;
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General_Memory general;
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};
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#define Mem_Options Debug_Mem_Options
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#define general_memory_open(sys,gen,mem,siz) debug_gm_open(sys,gen,mem,siz)
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#define general_memory_allocate(gen,siz) debug_gm_allocate(gen,siz)
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#define general_memory_free(gen,siz) debug_gm_free(gen,siz)
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#define general_memory_reallocate(gen,old,old_size,new_size) debug_gm_reallocate(gen,old,old_size,new_size)
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#define general_memory_reallocate_nocopy(gen,old,new_size) debug_gm_reallocate_nocopy(gen,old,new_size)
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#endif
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// BOTTOM
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