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#ifndef MLIB_ALLOC_H
#define MLIB_ALLOC_H
#include <setjmp.h>
#include <stddef.h>
#include "_attrs.h"
#ifndef MLIB_ARENA_BLKSIZE
# define MLIB_ARENA_BLKSIZE (8 * 1024)
#endif
struct _region {
size_t len, cap;
void *data, *last;
struct _region *next;
};
typedef struct {
struct _region *_head;
size_t _init;
} arena;
/* Heap allocation functions */
[[nodiscard, gnu::returns_nonnull]] void *bufalloc(void *, size_t, size_t);
[[nodiscard]] void *bufalloc_noterm(void *, size_t, size_t);
[[_mlib_pure, _mlib_inline]]
static inline arena
mkarena(size_t n)
{
return (arena){._init = n ? n : MLIB_ARENA_BLKSIZE};
}
/* Arena allocation functions */
[[nodiscard, gnu::malloc, gnu::alloc_size(2, 3), gnu::alloc_align(4)]]
void *arena_alloc(arena *, size_t, size_t, size_t);
[[nodiscard]]
void *arena_realloc(arena *, void *, size_t, size_t, size_t, size_t);
void arena_zero(arena *);
void arena_free(arena *);
/* Arena allocation macro wrappers */
#define arena_new(a, T, n) ((T *)arena_alloc((a), (n), sizeof(T), alignof(T)))
#define arena_resz(a, T, p, n) \
((T *)arena_realloc((a), (p), (n), sizeof(T), alignof(T)))
/* Memory allocator callbacks for memory-allocating functions */
struct arena_ctx {
arena *a;
jmp_buf *jmp;
};
struct heap_ctx {
jmp_buf *jmp;
};
[[nodiscard]] void *alloc_arena(void *, void *, size_t, size_t, size_t);
[[nodiscard]] void *alloc_heap(void *, void *, size_t, size_t, size_t);
#endif /* !MLIB_ALLOC_H */
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