Nils O. Selåsdal
70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
#pragma once
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#include "base_core.h"
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typedef U32 ArenaFlags; // no flags defined yet
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typedef struct ArenaParams ArenaParams;
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struct ArenaParams {
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U32 size;
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U32 commit_size;
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ArenaFlags flags; // No flags defined yet
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};
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typedef struct MemoryBlock MemoryBlock;
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struct MemoryBlock {
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U8 *base;
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U32 size; // Block size, page aligned
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U32 pos; // start of next allocation
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U64 base_pos; // absolute position of base relative to the first linked arena
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U32 committed_end; // end of committed region. Will be page aligned
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MemoryBlock *prev;
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};
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typedef struct Arena Arena;
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struct Arena {
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MemoryBlock *current;
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U32 block_size; // requested block size
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U32 commit_size; // requested commit size
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U32 page_size; // cached page size
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ArenaFlags flags;
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S32 checkpoint_level;
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};
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typedef struct ArenaCheckpoint ArenaCheckpoint;
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struct ArenaCheckpoint {
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Arena *arena;
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U64 absolute_pos;
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};
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#ifndef ArenaParams_Default
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#define ArenaParams_Default { .size = MB(32), .commit_size = KB(64) }
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#endif
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StaticAssert(sizeof(MemoryBlock) <= 64);
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// Try keep start of user memory at a cacheline
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#define MemoryBlock_Header_Size 64u
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void arena_init(Arena *arena, const ArenaParams *params);
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void arena_free(Arena *arena);
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void *arena_push(Arena *arena, U32 size, U32 align);
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#define arena_push_type(arena, type) arena_push(arena, (U32)sizeof(type), alignof(type))
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// Invalid for arrays > U32
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#define arena_push_array_of(arena, type, len) arena_push(arena, (U32) (sizeof(type) * (len)), alignof(type))
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ArenaCheckpoint arena_temp_begin(Arena *arena);
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void arena_temp_end(ArenaCheckpoint *checkpoint);
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void arena_pop_to(Arena *arena, U64 abs_pos);
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void arena_reset(Arena *arena);
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static INLINE U32 memoryblock_available(const MemoryBlock *block)
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{
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return block->size - block->pos;
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}
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static INLINE U64 arena_used(const Arena *arena)
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{
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const MemoryBlock *block = arena->current;
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return block->base_pos + block->pos;
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}
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