2 * Copyright (c) 2008, 2009, 2010 Nicira Networks.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 /* A non-exhaustive test for some of the functions and macros declared in
29 /* Sample hmap element. */
32 struct hmap_node node;
35 typedef size_t hash_func(int value);
38 compare_ints(const void *a_, const void *b_)
42 return *a < *b ? -1 : *a > *b;
45 /* Verifies that 'hmap' contains exactly the 'n' values in 'values'. */
47 check_hmap(struct hmap *hmap, const int values[], size_t n,
50 int *sort_values, *hmap_values;
54 /* Check that all the values are there in iteration. */
55 sort_values = xmalloc(sizeof *sort_values * n);
56 hmap_values = xmalloc(sizeof *sort_values * n);
59 HMAP_FOR_EACH (e, struct element, node, hmap) {
61 hmap_values[i++] = e->value;
65 memcpy(sort_values, values, sizeof *sort_values * n);
66 qsort(sort_values, n, sizeof *sort_values, compare_ints);
67 qsort(hmap_values, n, sizeof *hmap_values, compare_ints);
69 for (i = 0; i < n; i++) {
70 assert(sort_values[i] == hmap_values[i]);
76 /* Check that all the values are there in lookup. */
77 for (i = 0; i < n; i++) {
80 HMAP_FOR_EACH_WITH_HASH (e, struct element, node,
81 hash(values[i]), hmap) {
82 count += e->value == values[i];
88 assert(hmap_is_empty(hmap) == !n);
89 assert(hmap_count(hmap) == n);
92 /* Puts the 'n' values in 'values' into 'elements', and then puts those
93 * elements into 'hmap'. */
95 make_hmap(struct hmap *hmap, struct element elements[],
96 int values[], size_t n, hash_func *hash)
101 for (i = 0; i < n; i++) {
102 elements[i].value = i;
103 hmap_insert(hmap, &elements[i].node, hash(elements[i].value));
109 shuffle(int *p, size_t n)
111 for (; n > 1; n--, p++) {
112 int *q = &p[rand() % n];
120 /* Prints the values in 'hmap', plus 'name' as a title. */
122 print_hmap(const char *name, struct hmap *hmap)
127 HMAP_FOR_EACH (e, struct element, node, hmap) {
128 printf(" %d(%zu)", e->value, e->node.hash & hmap->mask);
133 /* Prints the 'n' values in 'values', plus 'name' as a title. */
135 print_ints(const char *name, const int *values, size_t n)
140 for (i = 0; i < n; i++) {
141 printf(" %d", values[i]);
148 identity_hash(int value)
156 return hash_int(value, 0x1234abcd);
160 constant_hash(int value OVS_UNUSED)
165 /* Tests basic hmap insertion and deletion. */
167 test_hmap_insert_delete(hash_func *hash)
169 enum { N_ELEMS = 100 };
171 struct element elements[N_ELEMS];
177 for (i = 0; i < N_ELEMS; i++) {
178 elements[i].value = i;
179 hmap_insert(&hmap, &elements[i].node, hash(i));
181 check_hmap(&hmap, values, i + 1, hash);
183 shuffle(values, N_ELEMS);
184 for (i = 0; i < N_ELEMS; i++) {
185 hmap_remove(&hmap, &elements[values[i]].node);
186 check_hmap(&hmap, values + (i + 1), N_ELEMS - (i + 1), hash);
191 /* Tests basic hmap_reserve() and hmap_shrink(). */
193 test_hmap_reserve_shrink(hash_func *hash)
195 enum { N_ELEMS = 32 };
199 for (i = 0; i < N_ELEMS; i++) {
200 struct element elements[N_ELEMS];
206 hmap_reserve(&hmap, i);
207 for (j = 0; j < N_ELEMS; j++) {
208 elements[j].value = j;
209 hmap_insert(&hmap, &elements[j].node, hash(j));
211 check_hmap(&hmap, values, j + 1, hash);
213 shuffle(values, N_ELEMS);
214 for (j = 0; j < N_ELEMS; j++) {
215 hmap_remove(&hmap, &elements[values[j]].node);
217 check_hmap(&hmap, values + (j + 1), N_ELEMS - (j + 1), hash);
223 /* Tests that HMAP_FOR_EACH_SAFE properly allows for deletion of the current
224 * element of a hmap. */
226 test_hmap_for_each_safe(hash_func *hash)
228 enum { MAX_ELEMS = 10 };
230 unsigned long int pattern;
232 for (n = 0; n <= MAX_ELEMS; n++) {
233 for (pattern = 0; pattern < 1ul << n; pattern++) {
234 struct element elements[MAX_ELEMS];
235 int values[MAX_ELEMS];
237 struct element *e, *next;
241 make_hmap(&hmap, elements, values, n, hash);
245 HMAP_FOR_EACH_SAFE (e, next, struct element, node, &hmap) {
247 if (pattern & (1ul << e->value)) {
249 hmap_remove(&hmap, &e->node);
251 assert(j < n_remaining);
252 if (values[j] == e->value) {
253 values[j] = values[--n_remaining];
258 check_hmap(&hmap, values, n_remaining, hash);
263 for (i = 0; i < n; i++) {
264 if (pattern & (1ul << i)) {
268 assert(n == n_remaining);
276 run_test(void (*function)(hash_func *))
278 hash_func *hash_funcs[] = { identity_hash, good_hash, constant_hash };
281 for (i = 0; i < ARRAY_SIZE(hash_funcs); i++) {
282 function(hash_funcs[i]);
291 run_test(test_hmap_insert_delete);
292 run_test(test_hmap_for_each_safe);
293 run_test(test_hmap_reserve_shrink);