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util/hash_table: Try to hit a double-insertion bug in the collision test 

Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Jason Ekstrand 2015-02-04 18:49:11 -08:00
parent 623c3a858d
commit 345e8cc849
1 changed files with 13 additions and 1 deletions
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14
src/util/tests/hash_table/collision.c
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@ -36,14 +36,19 @@ main(int argc, char **argv)
struct hash_table *ht;
const char *str1 = "test1";
const char *str2 = "test2";
struct hash_entry *entry1, *entry2;
const char *str3 = "test3";
struct hash_entry *entry1, *entry2, *search_entry;
uint32_t bad_hash = 5;
int i;
ht = _mesa_hash_table_create(NULL, NULL, _mesa_key_string_equal);
/* Insert some items. Inserting 3 items forces a rehash and the new
* table size is big enough that we don't get rehashes later.
*/
_mesa_hash_table_insert_pre_hashed(ht, bad_hash, str1, NULL);
_mesa_hash_table_insert_pre_hashed(ht, bad_hash, str2, NULL);
_mesa_hash_table_insert_pre_hashed(ht, bad_hash, str3, NULL);
entry1 = _mesa_hash_table_search_pre_hashed(ht, bad_hash, str1);
assert(entry1->key == str1);
@ -60,6 +65,13 @@ main(int argc, char **argv)
entry2 = _mesa_hash_table_search_pre_hashed(ht, bad_hash, str2);
assert(entry2->key == str2);
/* Try inserting #2 again and make sure it gets overwritten */
_mesa_hash_table_insert_pre_hashed(ht, bad_hash, str2, NULL);
entry2 = _mesa_hash_table_search_pre_hashed(ht, bad_hash, str2);
hash_table_foreach(ht, search_entry) {
assert(search_entry == entry2 || search_entry->key != str2);
}
/* Put str1 back, then spam junk into the table to force a
* resize and make sure we can still find them both.
*/