Andrew's git - gitweb.git/blob - t/helper/test-hashmap.c

   1#include "git-compat-util.h"
   2#include "hashmap.h"
   3
   4struct test_entry
   5{
   6        struct hashmap_entry ent;
   7        /* key and value as two \0-terminated strings */
   8        char key[FLEX_ARRAY];
   9};
  10
  11static const char *get_value(const struct test_entry *e)
  12{
  13        return e->key + strlen(e->key) + 1;
  14}
  15
  16static int test_entry_cmp(const struct test_entry *e1,
  17                const struct test_entry *e2, const char* key)
  18{
  19        return strcmp(e1->key, key ? key : e2->key);
  20}
  21
  22static int test_entry_cmp_icase(const struct test_entry *e1,
  23                const struct test_entry *e2, const char* key)
  24{
  25        return strcasecmp(e1->key, key ? key : e2->key);
  26}
  27
  28static struct test_entry *alloc_test_entry(int hash, char *key, int klen,
  29                char *value, int vlen)
  30{
  31        struct test_entry *entry = malloc(sizeof(struct test_entry) + klen
  32                        + vlen + 2);
  33        hashmap_entry_init(entry, hash);
  34        memcpy(entry->key, key, klen + 1);
  35        memcpy(entry->key + klen + 1, value, vlen + 1);
  36        return entry;
  37}
  38
  39#define HASH_METHOD_FNV 0
  40#define HASH_METHOD_I 1
  41#define HASH_METHOD_IDIV10 2
  42#define HASH_METHOD_0 3
  43#define HASH_METHOD_X2 4
  44#define TEST_SPARSE 8
  45#define TEST_ADD 16
  46#define TEST_SIZE 100000
  47
  48static unsigned int hash(unsigned int method, unsigned int i, const char *key)
  49{
  50        unsigned int hash = 0;
  51        switch (method & 3)
  52        {
  53        case HASH_METHOD_FNV:
  54                hash = strhash(key);
  55                break;
  56        case HASH_METHOD_I:
  57                hash = i;
  58                break;
  59        case HASH_METHOD_IDIV10:
  60                hash = i / 10;
  61                break;
  62        case HASH_METHOD_0:
  63                hash = 0;
  64                break;
  65        }
  66
  67        if (method & HASH_METHOD_X2)
  68                hash = 2 * hash;
  69        return hash;
  70}
  71
  72/*
  73 * Test performance of hashmap.[ch]
  74 * Usage: time echo "perfhashmap method rounds" | test-hashmap
  75 */
  76static void perf_hashmap(unsigned int method, unsigned int rounds)
  77{
  78        struct hashmap map;
  79        char buf[16];
  80        struct test_entry **entries;
  81        unsigned int *hashes;
  82        unsigned int i, j;
  83
  84        entries = malloc(TEST_SIZE * sizeof(struct test_entry *));
  85        hashes = malloc(TEST_SIZE * sizeof(int));
  86        for (i = 0; i < TEST_SIZE; i++) {
  87                snprintf(buf, sizeof(buf), "%i", i);
  88                entries[i] = alloc_test_entry(0, buf, strlen(buf), "", 0);
  89                hashes[i] = hash(method, i, entries[i]->key);
  90        }
  91
  92        if (method & TEST_ADD) {
  93                /* test adding to the map */
  94                for (j = 0; j < rounds; j++) {
  95                        hashmap_init(&map, (hashmap_cmp_fn) test_entry_cmp, 0);
  96
  97                        /* add entries */
  98                        for (i = 0; i < TEST_SIZE; i++) {
  99                                hashmap_entry_init(entries[i], hashes[i]);
 100                                hashmap_add(&map, entries[i]);
 101                        }
 102
 103                        hashmap_free(&map, 0);
 104                }
 105        } else {
 106                /* test map lookups */
 107                hashmap_init(&map, (hashmap_cmp_fn) test_entry_cmp, 0);
 108
 109                /* fill the map (sparsely if specified) */
 110                j = (method & TEST_SPARSE) ? TEST_SIZE / 10 : TEST_SIZE;
 111                for (i = 0; i < j; i++) {
 112                        hashmap_entry_init(entries[i], hashes[i]);
 113                        hashmap_add(&map, entries[i]);
 114                }
 115
 116                for (j = 0; j < rounds; j++) {
 117                        for (i = 0; i < TEST_SIZE; i++) {
 118                                hashmap_get_from_hash(&map, hashes[i],
 119                                                      entries[i]->key);
 120                        }
 121                }
 122
 123                hashmap_free(&map, 0);
 124        }
 125}
 126
 127#define DELIM " \t\r\n"
 128
 129/*
 130 * Read stdin line by line and print result of commands to stdout:
 131 *
 132 * hash key -> strhash(key) memhash(key) strihash(key) memihash(key)
 133 * put key value -> NULL / old value
 134 * get key -> NULL / value
 135 * remove key -> NULL / old value
 136 * iterate -> key1 value1\nkey2 value2\n...
 137 * size -> tablesize numentries
 138 *
 139 * perfhashmap method rounds -> test hashmap.[ch] performance
 140 */
 141int cmd_main(int argc, const char **argv)
 142{
 143        char line[1024];
 144        struct hashmap map;
 145        int icase;
 146
 147        /* init hash map */
 148        icase = argc > 1 && !strcmp("ignorecase", argv[1]);
 149        hashmap_init(&map, (hashmap_cmp_fn) (icase ? test_entry_cmp_icase
 150                        : test_entry_cmp), 0);
 151
 152        /* process commands from stdin */
 153        while (fgets(line, sizeof(line), stdin)) {
 154                char *cmd, *p1 = NULL, *p2 = NULL;
 155                int l1 = 0, l2 = 0, hash = 0;
 156                struct test_entry *entry;
 157
 158                /* break line into command and up to two parameters */
 159                cmd = strtok(line, DELIM);
 160                /* ignore empty lines */
 161                if (!cmd || *cmd == '#')
 162                        continue;
 163
 164                p1 = strtok(NULL, DELIM);
 165                if (p1) {
 166                        l1 = strlen(p1);
 167                        hash = icase ? strihash(p1) : strhash(p1);
 168                        p2 = strtok(NULL, DELIM);
 169                        if (p2)
 170                                l2 = strlen(p2);
 171                }
 172
 173                if (!strcmp("hash", cmd) && l1) {
 174
 175                        /* print results of different hash functions */
 176                        printf("%u %u %u %u\n", strhash(p1), memhash(p1, l1),
 177                                        strihash(p1), memihash(p1, l1));
 178
 179                } else if (!strcmp("add", cmd) && l1 && l2) {
 180
 181                        /* create entry with key = p1, value = p2 */
 182                        entry = alloc_test_entry(hash, p1, l1, p2, l2);
 183
 184                        /* add to hashmap */
 185                        hashmap_add(&map, entry);
 186
 187                } else if (!strcmp("put", cmd) && l1 && l2) {
 188
 189                        /* create entry with key = p1, value = p2 */
 190                        entry = alloc_test_entry(hash, p1, l1, p2, l2);
 191
 192                        /* add / replace entry */
 193                        entry = hashmap_put(&map, entry);
 194
 195                        /* print and free replaced entry, if any */
 196                        puts(entry ? get_value(entry) : "NULL");
 197                        free(entry);
 198
 199                } else if (!strcmp("get", cmd) && l1) {
 200
 201                        /* lookup entry in hashmap */
 202                        entry = hashmap_get_from_hash(&map, hash, p1);
 203
 204                        /* print result */
 205                        if (!entry)
 206                                puts("NULL");
 207                        while (entry) {
 208                                puts(get_value(entry));
 209                                entry = hashmap_get_next(&map, entry);
 210                        }
 211
 212                } else if (!strcmp("remove", cmd) && l1) {
 213
 214                        /* setup static key */
 215                        struct hashmap_entry key;
 216                        hashmap_entry_init(&key, hash);
 217
 218                        /* remove entry from hashmap */
 219                        entry = hashmap_remove(&map, &key, p1);
 220
 221                        /* print result and free entry*/
 222                        puts(entry ? get_value(entry) : "NULL");
 223                        free(entry);
 224
 225                } else if (!strcmp("iterate", cmd)) {
 226
 227                        struct hashmap_iter iter;
 228                        hashmap_iter_init(&map, &iter);
 229                        while ((entry = hashmap_iter_next(&iter)))
 230                                printf("%s %s\n", entry->key, get_value(entry));
 231
 232                } else if (!strcmp("size", cmd)) {
 233
 234                        /* print table sizes */
 235                        printf("%u %u\n", map.tablesize, map.size);
 236
 237                } else if (!strcmp("intern", cmd) && l1) {
 238
 239                        /* test that strintern works */
 240                        const char *i1 = strintern(p1);
 241                        const char *i2 = strintern(p1);
 242                        if (strcmp(i1, p1))
 243                                printf("strintern(%s) returns %s\n", p1, i1);
 244                        else if (i1 == p1)
 245                                printf("strintern(%s) returns input pointer\n", p1);
 246                        else if (i1 != i2)
 247                                printf("strintern(%s) != strintern(%s)", i1, i2);
 248                        else
 249                                printf("%s\n", i1);
 250
 251                } else if (!strcmp("perfhashmap", cmd) && l1 && l2) {
 252
 253                        perf_hashmap(atoi(p1), atoi(p2));
 254
 255                } else {
 256
 257                        printf("Unknown command %s\n", cmd);
 258
 259                }
 260        }
 261
 262        hashmap_free(&map, 1);
 263        return 0;
 264}