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#define DEFAULT_ARENA_SIZE kilobytes(4)
arena_t alloc_arena(u64 capacity)
{
void *sys_alloc(u64 length);
/* TODO(pryazha): Find reasonable maximum capacity through testing */
assert(capacity <= (u64)gigabytes(16));
if (!capacity)
capacity = DEFAULT_ARENA_SIZE;
/* TODO(pryazha): Use OS specific memory allocator
* (like VirtualAlloc on Windows or mmap on Linux)
*/
void *memory = sys_alloc(capacity);
assert(memory);
arena_t arena = {memory, capacity, 0};
return arena;
}
void release_arena(arena_t *arena)
{
void sys_free(void *memory, u64 length);
assert(arena);
sys_free(arena->memory, arena->capacity);
arena->memory = 0;
arena->capacity = 0;
arena->used = 0;
}
void *push_arena(arena_t *arena, u64 size)
{
assert(arena);
assert(arena->used + size <= arena->capacity);
void *memory = arena->memory + arena->used;
arena->used += size;
return memory;
}
void pop_arena(arena_t *arena, u64 size)
{
assert(arena);
arena->used -= min(size, arena->used);
}
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