Definitions for arena memory management.
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src/base/base_arena.h
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58
src/base/base_arena.h
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#ifndef BASE_ARENA_H
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#define BASE_ARENA_H
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// Constants
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#define ARENA_HEADER_SIZE 64
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// Types
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typedef u32 ArenaFlags;
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enum { ArenaFlag_NoChain = (1 << 0); ArenaFlag_LargePages = (1 << 1); };
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typedef struct ArenaParams ArenaParams;
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struct ArenaParams {
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ArenaFlags flags;
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u64 reserve_size;
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u64 commite_size;
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void *optional_backing_buffer; // NOTE(tijani): ??
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};
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typedef struct Arena Arena;
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struct Arena {
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Arena *previous; // Previous arena in the chain
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Arena *current; // Current arena in the chain
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ArenaFlags flags;
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u32 commit_size;
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u64 reserve_size;
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u64 base_position;
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u64 position;
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u64 commit;
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u64 reserve;
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};
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typedef struct Temp Temp;
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struct Temp {
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Arena *arena;
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u64 position;
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};
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// creation, destruction
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internal Arena *arena_alloc_(ArenaParams *params);
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#define arena_alloc(...) arena_alloc_(&(ArenaParams){.reserve_size = MB(64), .commit_size = KB(64), __VA_ARGS__})
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internal void arena_releas(Arena *arena);
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// push, pop operations
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internal void *arena_psuh(Arena *arena, u64 size, u64 align);
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internal u64 arena_position(Arena *arena);
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internal void arena_pop_to(Arena *arena, u64 position);
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internal void arena_clear(Arena *arena);
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internal void arena_pop(Arena *arena, u64 amount);
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#define push_array_no_zero_aligned(a, T, c, align) (T *)arena_push((a), sizeof(T) * (c), (align))
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#define push_array_aligned(a, T, c, align) (T *)MemoryZero(push_array_no_zero_aligned(a, T, c, align), sizeof(T) * (c))
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#define push_array_no_zero(a, T, c) push_array_no_zero_aligned(a, T, c, Max(8, Align_Of(T)))
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#define push_array(a, T, c) push_array_aligned(a, T, c, Max(8, Align_Of(T)))
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// Temp
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internal Temp temp_begin(Arena *arena);
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internal void temp_end(Temp temp);
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#endif // BASE_ARENA_H
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