diff options
| author | nasr <nsrddyn@gmail.com> | 2026-03-13 22:31:21 +0100 |
|---|---|---|
| committer | nasr <nsrddyn@gmail.com> | 2026-03-13 22:31:21 +0100 |
| commit | 444bfa2f41143aff7490e4fa21565947565b7d30 (patch) | |
| tree | 696b06d40140c85805d171597e37deb8290ead73 /base/base_arena.c | |
| parent | 3913d1778318cd0c6bfb871148d38abb33ec7fd3 (diff) | |
cleanup: generalisation
Diffstat (limited to 'base/base_arena.c')
| -rw-r--r-- | base/base_arena.c | 86 |
1 files changed, 0 insertions, 86 deletions
diff --git a/base/base_arena.c b/base/base_arena.c deleted file mode 100644 index 16997b2..0000000 --- a/base/base_arena.c +++ /dev/null | |||
| @@ -1,86 +0,0 @@ | |||
| 1 | /** | ||
| 2 | * TODO(nasr): remove stdlib | ||
| 3 | * */ | ||
| 4 | #include <assert.h> | ||
| 5 | #include <stdint.h> | ||
| 6 | #include <string.h> | ||
| 7 | #include <sys/mman.h> | ||
| 8 | #include <sys/stat.h> | ||
| 9 | #include <dirent.h> | ||
| 10 | #include <fcntl.h> | ||
| 11 | #include <unistd.h> | ||
| 12 | |||
| 13 | #include "base_arena.h" | ||
| 14 | |||
| 15 | /* TODO(nasr): reserve pages support */ | ||
| 16 | /* TODO(nasr): check if an arena has been used before */ | ||
| 17 | |||
| 18 | local_internal mem_arena * | ||
| 19 | arena_create(u64 capacity) | ||
| 20 | { | ||
| 21 | mem_arena *arena = (mem_arena *)mmap(0, capacity, PROT_READ | PROT_WRITE | PROT_EXEC, | ||
| 22 | MAP_SHARED | MAP_ANONYMOUS, -1, 0); | ||
| 23 | if (arena == MAP_FAILED) | ||
| 24 | { | ||
| 25 | return NULL; | ||
| 26 | } | ||
| 27 | |||
| 28 | arena->capacity = capacity; | ||
| 29 | arena->pos = ARENA_BASE_POS; | ||
| 30 | |||
| 31 | return arena; | ||
| 32 | } | ||
| 33 | |||
| 34 | /* | ||
| 35 | * make it a void pointer to allow implicit conversion | ||
| 36 | * */ | ||
| 37 | local_internal void | ||
| 38 | arena_destroy(mem_arena *arena) | ||
| 39 | { | ||
| 40 | munmap(arena, arena->capacity); | ||
| 41 | } | ||
| 42 | |||
| 43 | local_internal void * | ||
| 44 | arena_push(mem_arena *arena, u64 size, b32 non_zero) | ||
| 45 | { | ||
| 46 | u64 pos_aligned = ALIGN_UP_POW2(arena->pos, ARENA_ALIGN); | ||
| 47 | u64 new_pos = pos_aligned + size; | ||
| 48 | |||
| 49 | if (new_pos > arena->capacity) | ||
| 50 | { | ||
| 51 | assert(0); | ||
| 52 | return NULL; | ||
| 53 | } | ||
| 54 | |||
| 55 | arena->pos = new_pos; | ||
| 56 | /* | ||
| 57 | * cast to u8 to be able to do pointer arithemtic | ||
| 58 | * */ | ||
| 59 | u8 *out = (u8 *)arena + pos_aligned; | ||
| 60 | |||
| 61 | if (!non_zero) | ||
| 62 | { | ||
| 63 | memset(out, 0, size); | ||
| 64 | } | ||
| 65 | return out; | ||
| 66 | } | ||
| 67 | |||
| 68 | local_internal void | ||
| 69 | arena_pop(mem_arena *arena, u64 size) | ||
| 70 | { | ||
| 71 | size = MIN(size, arena->pos - ARENA_BASE_POS); | ||
| 72 | arena->pos -= size; | ||
| 73 | } | ||
| 74 | |||
| 75 | local_internal void | ||
| 76 | arena_pop_to(mem_arena *arena, u64 pos) | ||
| 77 | { | ||
| 78 | u64 size = pos < arena->pos ? arena->pos - pos : 0; | ||
| 79 | arena_pop(arena, size); | ||
| 80 | } | ||
| 81 | |||
| 82 | local_internal void | ||
| 83 | arena_clear(mem_arena *arena) | ||
| 84 | { | ||
| 85 | arena_pop_to(arena, ARENA_BASE_POS); | ||
| 86 | } | ||
