mirror of
https://github.com/Ed94/raddebugger.git
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Nikita Smith
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
// Copyright (c) Epic Games Tools
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// Licensed under the MIT license (https://opensource.org/license/mit/)
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#ifndef BASE_ARENA_H
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#define BASE_ARENA_H
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////////////////////////////////
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//~ rjf: Arena Types
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#define ARENA_HEADER_SIZE 128
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typedef U64 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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char *allocation_site_file;
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int allocation_site_line;
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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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U64 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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char *allocation_site_file;
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int allocation_site_line;
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#if ARENA_FREE_LIST
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Arena *free_last;
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#endif
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};
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StaticAssert(sizeof(Arena) <= ARENA_HEADER_SIZE, arena_header_size_check);
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typedef struct Temp Temp;
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struct Temp
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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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global U64 arena_default_reserve_size = MB(64);
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global U64 arena_default_commit_size = KB(64);
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global ArenaFlags arena_default_flags = 0;
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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 = arena_default_reserve_size, .commit_size = arena_default_commit_size, .flags = arena_default_flags, .allocation_site_file = __FILE__, .allocation_site_line = __LINE__, __VA_ARGS__})
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internal void arena_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, B32 zero);
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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 Temp temp_begin(Arena *arena);
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internal void temp_end(Temp 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), (0))
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#define push_array_aligned(a, T, c, align) (T *)arena_push((a), sizeof(T)*(c), (align), (1))
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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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#endif // BASE_ARENA_H
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