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refactor: Changed align_arena to arena_align and changed signatrue, added arena_calculate_capacity

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I need to assure that capacity is enough, i mean, for something like
an array just doubling size is good because you are storing things
that are the same size but for something like an arena you could actually
store anything so we need to make sure the growth factor stays cool while
an overflow doesn't occur, that's why the change with arena_calculate_capacity
and also changing signatrues to use results, A LOT of boilerplate but
i guess is fine for me.
This commit is contained in:
Alonso Adrian Martinez Hernandez
2026-03-29 20:59:32 -06:00
parent 00942d3bd6
commit a8423ca80f
2 changed files with 31 additions and 7 deletions
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27
src/arena.c
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@@ -55,8 +55,16 @@ ArenaPointer arena_alloc(Arena *arena, size_t size, size_t alignment) {
return err;
}
size_t new_offset = align_arena_offset(arena, alignment);
if (new_offset + size >= arena->size) {
SizeResult new_offset = align_arena_offset(arena, alignment);
if (!new_offset.is_valid) {
ArenaPointer err = {
.is_valid = false,
.err = new_offset.err,
};
return err;
}
if (new_offset.val + size >= arena->size) {
ArenaPointer err = {
.is_valid = false,
.err = ARENA_OUT_OF_SPACE,
@@ -64,7 +72,7 @@ ArenaPointer arena_alloc(Arena *arena, size_t size, size_t alignment) {
return err;
}
arena->offset = new_offset;
arena->offset = new_offset.val;
ArenaPointer val = {
.is_valid = true,
@@ -81,13 +89,18 @@ ArenaErr arena_push(Arena *arena, void *data, size_t size, size_t alignment) {
ArenaPointer pointer = arena_alloc(arena, size, alignment);
if (!pointer.is_valid) {
size_t new_size = arena->size * 2;
ArenaErr err = arena_realloc(arena, new_size);
SizeResult new_size = arena_compute_necessary_capacity(arena->size, size);
if (!new_size.is_valid) {
return new_size.err;
}
ArenaErr err = arena_realloc(arena, new_size.val);
if (err != ARENA_OK) {
return err;
}
}
pointer = arena_alloc(arena, size, alignment);
}
memcpy(
pointer.address,
@@ -111,3 +124,5 @@ ArenaErr arena_realloc(Arena *arena, size_t new_size) {
arena->size = new_size;
return ARENA_OK;
}