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Implement reallocation functionality for Arena allocator

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Abdelrahman Said 2024-09-14 17:27:33 +01:00
parent 16a1b8fa35
commit 7fea236618
1 changed files with 28 additions and 2 deletions
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30
src/core/mem/arena/mem_arena.c
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@ -96,11 +96,37 @@ void *wapp_mem_arena_alloc_aligned(Arena *arena, u64 size, u64 alignment) {
} }
void *wapp_mem_arena_realloc(Arena *arena, void *ptr, u64 old_size, u64 new_size) { void *wapp_mem_arena_realloc(Arena *arena, void *ptr, u64 old_size, u64 new_size) {
return NULL; if ((u8*)ptr < arena->buf || (u8*)ptr > arena->offset ||
arena->offset + new_size >= arena->buf + arena->capacity) {
return NULL;
}
void *new_ptr = wapp_mem_arena_alloc(arena, new_size);
if (!new_ptr) {
return NULL;
}
u64 copy_size = new_size <= old_size ? new_size : old_size;
memcpy(new_ptr, ptr, copy_size);
return new_ptr;
} }
void *wapp_mem_arena_realloc_aligned(Arena *arena, void *ptr, u64 old_size, u64 new_size, u64 alignment) { void *wapp_mem_arena_realloc_aligned(Arena *arena, void *ptr, u64 old_size, u64 new_size, u64 alignment) {
return NULL; if ((u8*)ptr < arena->buf || (u8*)ptr > arena->offset ||
arena->offset + new_size >= arena->buf + arena->capacity) {
return NULL;
}
void *new_ptr = wapp_mem_arena_alloc_aligned(arena, new_size, alignment);
if (!new_ptr) {
return NULL;
}
u64 copy_size = new_size <= old_size ? new_size : old_size;
memcpy(new_ptr, ptr, copy_size);
return new_ptr;
} }
void wapp_mem_arena_clear(Arena *arena) { void wapp_mem_arena_clear(Arena *arena) {