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-rw-r--r--test-hashmap.c255
1 files changed, 255 insertions, 0 deletions
diff --git a/test-hashmap.c b/test-hashmap.c
new file mode 100644
index 0000000000..f5183fb9e8
--- /dev/null
+++ b/test-hashmap.c
@@ -0,0 +1,255 @@
+#include "git-compat-util.h"
+#include "hashmap.h"
+
+struct test_entry
+{
+ struct hashmap_entry ent;
+ /* key and value as two \0-terminated strings */
+ char key[FLEX_ARRAY];
+};
+
+static const char *get_value(const struct test_entry *e)
+{
+ return e->key + strlen(e->key) + 1;
+}
+
+static int test_entry_cmp(const struct test_entry *e1,
+ const struct test_entry *e2, const char* key)
+{
+ return strcmp(e1->key, key ? key : e2->key);
+}
+
+static int test_entry_cmp_icase(const struct test_entry *e1,
+ const struct test_entry *e2, const char* key)
+{
+ return strcasecmp(e1->key, key ? key : e2->key);
+}
+
+static struct test_entry *alloc_test_entry(int hash, char *key, int klen,
+ char *value, int vlen)
+{
+ struct test_entry *entry = malloc(sizeof(struct test_entry) + klen
+ + vlen + 2);
+ hashmap_entry_init(entry, hash);
+ memcpy(entry->key, key, klen + 1);
+ memcpy(entry->key + klen + 1, value, vlen + 1);
+ return entry;
+}
+
+#define HASH_METHOD_FNV 0
+#define HASH_METHOD_I 1
+#define HASH_METHOD_IDIV10 2
+#define HASH_METHOD_0 3
+#define HASH_METHOD_X2 4
+#define TEST_SPARSE 8
+#define TEST_ADD 16
+#define TEST_SIZE 100000
+
+static unsigned int hash(unsigned int method, unsigned int i, const char *key)
+{
+ unsigned int hash;
+ switch (method & 3)
+ {
+ case HASH_METHOD_FNV:
+ hash = strhash(key);
+ break;
+ case HASH_METHOD_I:
+ hash = i;
+ break;
+ case HASH_METHOD_IDIV10:
+ hash = i / 10;
+ break;
+ case HASH_METHOD_0:
+ hash = 0;
+ break;
+ }
+
+ if (method & HASH_METHOD_X2)
+ hash = 2 * hash;
+ return hash;
+}
+
+/*
+ * Test performance of hashmap.[ch]
+ * Usage: time echo "perfhashmap method rounds" | test-hashmap
+ */
+static void perf_hashmap(unsigned int method, unsigned int rounds)
+{
+ struct hashmap map;
+ char buf[16];
+ struct test_entry **entries;
+ unsigned int *hashes;
+ unsigned int i, j;
+
+ entries = malloc(TEST_SIZE * sizeof(struct test_entry *));
+ hashes = malloc(TEST_SIZE * sizeof(int));
+ for (i = 0; i < TEST_SIZE; i++) {
+ snprintf(buf, sizeof(buf), "%i", i);
+ entries[i] = alloc_test_entry(0, buf, strlen(buf), "", 0);
+ hashes[i] = hash(method, i, entries[i]->key);
+ }
+
+ if (method & TEST_ADD) {
+ /* test adding to the map */
+ for (j = 0; j < rounds; j++) {
+ hashmap_init(&map, (hashmap_cmp_fn) test_entry_cmp, 0);
+
+ /* add entries */
+ for (i = 0; i < TEST_SIZE; i++) {
+ hashmap_entry_init(entries[i], hashes[i]);
+ hashmap_add(&map, entries[i]);
+ }
+
+ hashmap_free(&map, 0);
+ }
+ } else {
+ /* test map lookups */
+ hashmap_init(&map, (hashmap_cmp_fn) test_entry_cmp, 0);
+
+ /* fill the map (sparsely if specified) */
+ j = (method & TEST_SPARSE) ? TEST_SIZE / 10 : TEST_SIZE;
+ for (i = 0; i < j; i++) {
+ hashmap_entry_init(entries[i], hashes[i]);
+ hashmap_add(&map, entries[i]);
+ }
+
+ for (j = 0; j < rounds; j++) {
+ for (i = 0; i < TEST_SIZE; i++) {
+ struct hashmap_entry key;
+ hashmap_entry_init(&key, hashes[i]);
+ hashmap_get(&map, &key, entries[i]->key);
+ }
+ }
+
+ hashmap_free(&map, 0);
+ }
+}
+
+#define DELIM " \t\r\n"
+
+/*
+ * Read stdin line by line and print result of commands to stdout:
+ *
+ * hash key -> strhash(key) memhash(key) strihash(key) memihash(key)
+ * put key value -> NULL / old value
+ * get key -> NULL / value
+ * remove key -> NULL / old value
+ * iterate -> key1 value1\nkey2 value2\n...
+ * size -> tablesize numentries
+ *
+ * perfhashmap method rounds -> test hashmap.[ch] performance
+ */
+int main(int argc, char *argv[])
+{
+ char line[1024];
+ struct hashmap map;
+ int icase;
+
+ /* init hash map */
+ icase = argc > 1 && !strcmp("ignorecase", argv[1]);
+ hashmap_init(&map, (hashmap_cmp_fn) (icase ? test_entry_cmp_icase
+ : test_entry_cmp), 0);
+
+ /* process commands from stdin */
+ while (fgets(line, sizeof(line), stdin)) {
+ char *cmd, *p1 = NULL, *p2 = NULL;
+ int l1 = 0, l2 = 0, hash = 0;
+ struct test_entry *entry;
+
+ /* break line into command and up to two parameters */
+ cmd = strtok(line, DELIM);
+ /* ignore empty lines */
+ if (!cmd || *cmd == '#')
+ continue;
+
+ p1 = strtok(NULL, DELIM);
+ if (p1) {
+ l1 = strlen(p1);
+ hash = icase ? strihash(p1) : strhash(p1);
+ p2 = strtok(NULL, DELIM);
+ if (p2)
+ l2 = strlen(p2);
+ }
+
+ if (!strcmp("hash", cmd) && l1) {
+
+ /* print results of different hash functions */
+ printf("%u %u %u %u\n", strhash(p1), memhash(p1, l1),
+ strihash(p1), memihash(p1, l1));
+
+ } else if (!strcmp("add", cmd) && l1 && l2) {
+
+ /* create entry with key = p1, value = p2 */
+ entry = alloc_test_entry(hash, p1, l1, p2, l2);
+
+ /* add to hashmap */
+ hashmap_add(&map, entry);
+
+ } else if (!strcmp("put", cmd) && l1 && l2) {
+
+ /* create entry with key = p1, value = p2 */
+ entry = alloc_test_entry(hash, p1, l1, p2, l2);
+
+ /* add / replace entry */
+ entry = hashmap_put(&map, entry);
+
+ /* print and free replaced entry, if any */
+ puts(entry ? get_value(entry) : "NULL");
+ free(entry);
+
+ } else if (!strcmp("get", cmd) && l1) {
+
+ /* setup static key */
+ struct hashmap_entry key;
+ hashmap_entry_init(&key, hash);
+
+ /* lookup entry in hashmap */
+ entry = hashmap_get(&map, &key, p1);
+
+ /* print result */
+ if (!entry)
+ puts("NULL");
+ while (entry) {
+ puts(get_value(entry));
+ entry = hashmap_get_next(&map, entry);
+ }
+
+ } else if (!strcmp("remove", cmd) && l1) {
+
+ /* setup static key */
+ struct hashmap_entry key;
+ hashmap_entry_init(&key, hash);
+
+ /* remove entry from hashmap */
+ entry = hashmap_remove(&map, &key, p1);
+
+ /* print result and free entry*/
+ puts(entry ? get_value(entry) : "NULL");
+ free(entry);
+
+ } else if (!strcmp("iterate", cmd)) {
+
+ struct hashmap_iter iter;
+ hashmap_iter_init(&map, &iter);
+ while ((entry = hashmap_iter_next(&iter)))
+ printf("%s %s\n", entry->key, get_value(entry));
+
+ } else if (!strcmp("size", cmd)) {
+
+ /* print table sizes */
+ printf("%u %u\n", map.tablesize, map.size);
+
+ } else if (!strcmp("perfhashmap", cmd) && l1 && l2) {
+
+ perf_hashmap(atoi(p1), atoi(p2));
+
+ } else {
+
+ printf("Unknown command %s\n", cmd);
+
+ }
+ }
+
+ hashmap_free(&map, 1);
+ return 0;
+}