diff options
Diffstat (limited to 'library/arena.c')
| -rw-r--r-- | library/arena.c | 81 |
1 files changed, 0 insertions, 81 deletions
diff --git a/library/arena.c b/library/arena.c deleted file mode 100644 index 39711d5..0000000 --- a/library/arena.c +++ /dev/null | |||
| @@ -1,81 +0,0 @@ | |||
| 1 | #include <assert.h> | ||
| 2 | #include <dirent.h> | ||
| 3 | #include <fcntl.h> | ||
| 4 | #include <stdint.h> | ||
| 5 | #include <string.h> | ||
| 6 | #include <sys/mman.h> | ||
| 7 | #include <sys/stat.h> | ||
| 8 | #include <unistd.h> | ||
| 9 | |||
| 10 | #include "arena.h" | ||
| 11 | |||
| 12 | mem_arena * | ||
| 13 | arena_create(u64 capacity) | ||
| 14 | { | ||
| 15 | mem_arena *arena = mmap(0, capacity, PROT_READ | PROT_WRITE | PROT_EXEC, | ||
| 16 | MAP_SHARED | MAP_ANONYMOUS, -1, 0); | ||
| 17 | if (arena == MAP_FAILED) | ||
| 18 | { | ||
| 19 | assert(0); | ||
| 20 | } | ||
| 21 | |||
| 22 | arena->capacity = capacity; | ||
| 23 | arena->pos = ARENA_BASE_POS; | ||
| 24 | |||
| 25 | return arena; | ||
| 26 | } | ||
| 27 | |||
| 28 | // make it a void pointer to allow implicit conversion | ||
| 29 | void | ||
| 30 | arena_destroy(mem_arena *arena) | ||
| 31 | { | ||
| 32 | munmap(arena, arena->capacity); | ||
| 33 | } | ||
| 34 | |||
| 35 | void * | ||
| 36 | arena_push(mem_arena *arena, u64 size, b32 non_zero) | ||
| 37 | { | ||
| 38 | u64 pos_aligned = ALIGN_UP_POW2(arena->pos, ARENA_ALIGN); | ||
| 39 | u64 new_pos = pos_aligned + size; | ||
| 40 | |||
| 41 | if (new_pos > arena->capacity) | ||
| 42 | { | ||
| 43 | assert(0); | ||
| 44 | return NULL; | ||
| 45 | } | ||
| 46 | |||
| 47 | arena->pos = new_pos; | ||
| 48 | // cast to u8 to be able to do pointer arithemtic | ||
| 49 | u8 *out = (u8 *)arena + pos_aligned; | ||
| 50 | |||
| 51 | if (!non_zero) | ||
| 52 | { | ||
| 53 | memset(out, 0, size); | ||
| 54 | } | ||
| 55 | return out; | ||
| 56 | } | ||
| 57 | void | ||
| 58 | arena_pop(mem_arena *arena, u64 size) | ||
| 59 | { | ||
| 60 | size = MIN(size, arena->pos - ARENA_BASE_POS); | ||
| 61 | arena->pos -= size; | ||
| 62 | } | ||
| 63 | |||
| 64 | void | ||
| 65 | arena_pop_to(mem_arena *arena, u64 pos) | ||
| 66 | { | ||
| 67 | u64 size = pos < arena->pos ? arena->pos - pos : 0; | ||
| 68 | arena_pop(arena, size); | ||
| 69 | } | ||
| 70 | |||
| 71 | void | ||
| 72 | arena_clear(mem_arena *arena) | ||
| 73 | { | ||
| 74 | arena_pop_to(arena, ARENA_BASE_POS); | ||
| 75 | } | ||
| 76 | |||
| 77 | #define PUSH_STRUCT(arena, T) (T *)arena_push((arena), sizeof(T), 0) | ||
| 78 | #define PUSH_STRUCT_NZ(arena, T) (T *)arena_push((arena), sizeof(T), 1) | ||
| 79 | #define PUSH_ARRAY(arena, T, n) (T *)arena_push((arena), sizeof(T) * (n), 0) | ||
| 80 | #define PUSH_ARRAY_NZ(arena, T, n) (T *)arena_push((arena), sizeof(T) * (n), 1) | ||
| 81 | |||
