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58
src/base/base_arena.h
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58
src/base/base_arena.h
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@ -0,0 +1,58 @@
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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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@ -1,11 +1,13 @@
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#ifndef BASE_CORE_H
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#define BASE_CORE_H
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// Foreigns
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#include <string.h>
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#define global static
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#define local static
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#define internal static
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// Base Types
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typedef uint8_t u8;
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typedef uint16_t u16;
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@ -25,5 +27,27 @@ typedef s64 b64;
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typedef float f32;
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typedef double f64;
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// Units
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#define KB(n) (((u64)(n)) << 10)
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#define MB(n) (((u64)(n)) << 20)
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#define GB(n) (((u64)(n)) << 30)
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#define TB(n) (((u64)(n)) << 40)
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#define Thousand(n) ((n) * 1000)
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#define Million(n) ((n) * 1000000)
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#define Billion(n) ((n) * 1000000000)
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// Memory operations
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#define MemoryZero(dest, count) memset((dest), 0, (count))
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// Max, Min
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#define Max(A, B) (((A) > (B)) ? (A) : (B))
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#define Min(A, B) (((A) < (B)) ? (A) : (B))
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// Type Alignment
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#if COMPILER_MSVC
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#define Align_Of(T) __alignof(T)
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#else
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#error Align_Of not defined for this compiler.
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#endif
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#endif // BASE_CORE_H
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@ -10,5 +10,4 @@
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// clang-format on
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#endif // BASE_INC_H
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