[PATCH v2] khash: clarify that allocations never fail
- From
René Scharfe <l.s.r@web.de>
- Date
- Jul 3, 2021, 12:57 UTC
- Message-ID
- <3778fb28-ed19-e90e-216a-d29d72305155@web.de>
- In-Reply-To
- <d13b50fd-5944-0bbe-d28e-8232a2932598@web.de>
We use our standard allocation functions and macros (xcalloc, ALLOC_ARRAY, REALLOC_ARRAY) in our version of khash.h. They terminate the program on error instead, so code that's using them doesn't have to handle allocation failures. Make this behavior explicit by turning kh_resize_ into a void function and removing the related unreachable error handling code.
Helped-by: Jeff King <peff@peff.net> Signed-off-by: René Scharfe <l.s.r@web.de> --- Changes since v1: - Removed BUG calls. - Made kh_resize_ void instead.
khash.h | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-)
diff --git a/khash.h b/khash.h index 21c2095216..cb79bf8856 100644 --- a/khash.h +++ b/khash.h @@ -74,7 +74,7 @@ static const double __ac_HASH_UPPER = 0.77; void kh_destroy_##name(kh_##name##_t *h); \ void kh_clear_##name(kh_##name##_t *h); \ khint_t kh_get_##name(const kh_##name##_t *h, khkey_t key); \ - int kh_resize_##name(kh_##name##_t *h, khint_t new_n_buckets); \ + void kh_resize_##name(kh_##name##_t *h, khint_t new_n_buckets); \ khint_t kh_put_##name(kh_##name##_t *h, khkey_t key, int *ret); \ void kh_del_##name(kh_##name##_t *h, khint_t x); @@ -116,7 +116,7 @@ static const double __ac_HASH_UPPER = 0.77; return __ac_iseither(h->flags, i)? h->n_buckets : i; \ } else return 0; \ } \ - SCOPE int kh_resize_##name(kh_##name##_t *h, khint_t new_n_buckets) \ + SCOPE void kh_resize_##name(kh_##name##_t *h, khint_t new_n_buckets) \ { /* This function uses 0.25*n_buckets bytes of working space instead of [sizeof(key_t+val_t)+.25]*n_buckets. */ \ khint32_t *new_flags = NULL; \ khint_t j = 1; \ @@ -126,7 +126,6 @@ static const double __ac_HASH_UPPER = 0.77; if (h->size >= (khint_t)(new_n_buckets * __ac_HASH_UPPER + 0.5)) j = 0; /* requested size is too small */ \ else { /* hash table size to be changed (shrink or expand); rehash */ \ ALLOC_ARRAY(new_flags, __ac_fsize(new_n_buckets)); \ - if (!new_flags) return -1; \ memset(new_flags, 0xaa, __ac_fsize(new_n_buckets) * sizeof(khint32_t)); \ if (h->n_buckets < new_n_buckets) { /* expand */ \ REALLOC_ARRAY(h->keys, new_n_buckets); \ @@ -173,18 +172,15 @@ static const double __ac_HASH_UPPER = 0.77; h->n_occupied = h->size; \ h->upper_bound = (khint_t)(h->n_buckets * __ac_HASH_UPPER + 0.5); \ } \ - return 0; \ } \ SCOPE khint_t kh_put_##name(kh_##name##_t *h, khkey_t key, int *ret) \ { \ khint_t x; \ if (h->n_occupied >= h->upper_bound) { /* update the hash table */ \ if (h->n_buckets > (h->size<<1)) { \ - if (kh_resize_##name(h, h->n_buckets - 1) < 0) { /* clear "deleted" elements */ \ - *ret = -1; return h->n_buckets; \ - } \ - } else if (kh_resize_##name(h, h->n_buckets + 1) < 0) { /* expand the hash table */ \ - *ret = -1; return h->n_buckets; \ + kh_resize_##name(h, h->n_buckets - 1); /* clear "deleted" elements */ \ + } else { \ + kh_resize_##name(h, h->n_buckets + 1); /* expand the hash table */ \ } \ } /* TODO: to implement automatically shrinking; resize() already support shrinking */ \ { \ -- 2.32.0