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82 lines
2.1 KiB
C
82 lines
2.1 KiB
C
#ifdef MD_INTELLISENSE_DIRECTIVES
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#pragma once
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#include "base_types.h"
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#include "macros.h"
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#endif
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// Copyright (c) 2024 Epic Games Tools
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// Licensed under the MIT license (https://opensource.org/license/mit/)
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////////////////////////////////
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//~ rjf: Constants
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#define MD_ARENA_HEADER_SIZE 64
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////////////////////////////////
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//~ rjf: Types
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typedef U32 ArenaFlags;
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enum
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{
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ArenaFlag_NoChain = (1<<0),
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ArenaFlag_LargePages = (1<<1),
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};
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typedef struct ArenaParams ArenaParams;
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struct ArenaParams
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{
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ArenaFlags flags;
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U64 reserve_size;
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U64 commit_size;
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void *optional_backing_buffer;
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};
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typedef struct Arena Arena;
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struct Arena
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{
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Arena *prev; // previous arena in chain
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Arena *current; // current arena in chain
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ArenaFlags flags;
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U32 cmt_size;
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U64 res_size;
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U64 base_pos;
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U64 pos;
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U64 cmt;
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U64 res;
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};
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static_assert(sizeof(Arena) <= MD_ARENA_HEADER_SIZE, "sizeof(Arena) <= MD_ARENA_HEADER_SIZE");
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typedef struct TempArena TempArena;
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struct TempArena
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{
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Arena *arena;
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U64 pos;
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};
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////////////////////////////////
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//~ rjf: Arena Functions
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//- rjf: arena 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 rarena_release(Arena *arena);
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//- rjf: arena push/pop/pos core functions
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internal void *arena_push(Arena *arena, U64 size, U64 align);
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internal U64 arena_pos(Arena *arena);
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internal void arena_pop_to(Arena *arena, U64 pos);
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//- rjf: arena push/pop helpers
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internal void arena_clear(Arena *arena);
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internal void arena_pop(Arena *arena, U64 amt);
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//- rjf: temporary arena scopes
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internal TempArena temp_arena_begin(Arena *arena);
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internal void temp_arena_end(TempArena temp);
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//- rjf: push helper macros
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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, AlignOf(T)))
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#define push_array(a, T, c) push_array_aligned(a, T, c, Max(8, AlignOf(T)))
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