Function slab_realloc

src/foundation/slab_alloc.c:323–352

}

static void *slab_realloc(void *ptr, size_t new_size) {
    if (!ptr) {
        return slab_malloc(new_size);
    }
    if (new_size == 0) {
        /* realloc(ptr, 0) = free + return NULL */
        slab_free(ptr);
        return NULL;
    }

    /* Case 1: ptr is in a slab page (≤64B block) */
    slab_page_t *page = slab_map_lookup((uintptr_t)ptr & SLAB_PAGE_MASK);
    if (page) {
        if (new_size <= SLAB_CHUNK_SIZE) {
            /* Still fits in a slab chunk — reuse same slot */
            return ptr;
        }
        /* Promote slab → heap */
        void *new_ptr = malloc(new_size);
        if (!new_ptr) {
            return NULL;
        }
        memcpy(new_ptr, ptr, SLAB_CHUNK_SIZE);
        slab_free(ptr);
        return new_ptr;
    }

    /* Case 2: heap pointer (from malloc) */
    return realloc(ptr, new_size);
}

static void slab_free(void *ptr) {
    if (!ptr) {