diff options
Diffstat (limited to 'arena.h')
-rw-r--r-- | arena.h | 109 |
1 files changed, 0 insertions, 109 deletions
diff --git a/arena.h b/arena.h deleted file mode 100644 index 9327a5e..0000000 --- a/arena.h +++ /dev/null @@ -1,109 +0,0 @@ -#ifndef ARENA_IMPL -#define ARENA_IMPL - -#include "common.h" - -#include <fcntl.h> -#include <stdint.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <strings.h> -#include <sys/mman.h> -#include <unistd.h> - -#define PAGESIZE 4096 - -#ifndef ARENA_MEMORY -#define ARENA_MEMORY PAGESIZE -#endif - -struct Arena { - void *memory; - u64 size; - u64 pos; -} typedef Arena; - -// Create an arena -Arena *ArenaAlloc(void); -// Destroy an arena -void ArenaRelease(Arena *arena); - -// Push bytes on to the arena | allocating -void *ArenaPush(Arena *arena, u64 size); -void *ArenaPushZero(Arena *arena, u64 size); - -#define PushArray(arena, type, count) (type *)ArenaPush((arena), sizeof(type)*(count)) -#define PushArrayZero(arena, type, count) (type *)ArenaPushZero((arena), sizeof(type) * (count)) -#define PushStruct(arena, type) PushArray((arena), (type), 1) -#define PushStructZero(arena, type) PushArrayZero((arena), (type), 1) - -// Free some bytes by popping the stack -void ArenaPop(Arena *arena, u64 size); -// Get the number of bytes allocated -u64 ArenaGetPos(Arena *arena); - -void ArenaSetPosBack(Arena *arena, u64 pos); -void ArenaClear(Arena *arena); - -Arena *ArenaAlloc(void) -{ - // NOTE: If the arena is created here the pointer to the memory get's overwritten with size in - // ArenaPush, so we are forced to use malloc - Arena *arena = malloc(sizeof(Arena)); - - arena->memory = mmap(NULL, ARENA_MEMORY, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); - if (arena->memory == MAP_FAILED) - return NULL; - - arena->pos = 0; - arena->size = ARENA_MEMORY; - - return arena; -} - -void ArenaRelease(Arena *arena) -{ - munmap(arena->memory, ARENA_MEMORY); - free(arena); -} - -void *ArenaPush(Arena *arena, u64 size) -{ - u8 *mem; - mem = (u8 *)arena->memory + arena->pos; - arena->pos += size; - return mem; -} - -void *ArenaPushZero(Arena *arena, u64 size) -{ - u8 *mem; - mem = (u8 *)arena->memory + arena->pos; - bzero(mem, size); - arena->pos += size; - return mem; -} - -void ArenaPop(Arena *arena, u64 size) -{ - arena->pos -= size; -} - -u64 ArenaGetPos(Arena *arena) -{ - return arena->pos; -} - -void ArenaSetPosBack(Arena *arena, u64 pos) -{ - arena->pos -= pos; -} - -void ArenaClear(Arena *arena) -{ - bzero(arena->memory, arena->size); - arena->pos = 0; -} - -#endif |