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#include "test-tool.h"
#include "git-compat-util.h"
#include "hashmap.h"
#include "strbuf.h"
#include "string-list.h"
struct test_entry
{
int padding; /* hashmap entry no longer needs to be the first member */
struct hashmap_entry ent;
/* key and value as two \0-terminated strings */
char key[FLEX_ARRAY];
};
static int test_entry_cmp(const void *cmp_data,
const struct hashmap_entry *eptr,
const struct hashmap_entry *entry_or_key,
const void *keydata)
{
const int ignore_case = cmp_data ? *((int *)cmp_data) : 0;
const struct test_entry *e1, *e2;
const char *key = keydata;
e1 = container_of(eptr, const struct test_entry, ent);
e2 = container_of(entry_or_key, const struct test_entry, ent);
if (ignore_case)
return strcasecmp(e1->key, key ? key : e2->key);
else
return strcmp(e1->key, key ? key : e2->key);
}
static struct test_entry *alloc_test_entry(unsigned int hash,
const char *key,
const char *value)
{
size_t klen = strlen(key);
size_t vlen = strlen(value);
struct test_entry *entry = xmalloc(st_add4(sizeof(*entry), klen, vlen, 2));
hashmap_entry_init(&entry->ent, 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 = 0;
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-tool 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;
ALLOC_ARRAY(entries, TEST_SIZE);
ALLOC_ARRAY(hashes, TEST_SIZE);
for (i = 0; i < TEST_SIZE; i++) {
xsnprintf(buf, sizeof(buf), "%i", i);
entries[i] = alloc_test_entry(0, buf, "");
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, test_entry_cmp, NULL, 0);
/* add entries */
for (i = 0; i < TEST_SIZE; i++) {
hashmap_entry_init(&entries[i]->ent, hashes[i]);
hashmap_add(&map, &entries[i]->ent);
}
hashmap_clear(&map);
}
} else {
/* test map lookups */
hashmap_init(&map, test_entry_cmp, NULL, 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]->ent, hashes[i]);
hashmap_add(&map, &entries[i]->ent);
}
for (j = 0; j < rounds; j++) {
for (i = 0; i < TEST_SIZE; i++) {
hashmap_get_from_hash(&map, hashes[i],
entries[i]->key);
}
}
hashmap_clear(&map);
}
}
#define DELIM " \t\r\n"
/*
* Read stdin line by line and print result of commands to stdout:
*
* perfhashmap method rounds -> test hashmap.[ch] performance
*
* NOTE: this is not used by any of our mechanized build & test
* procedure, after 3469a236 (t: port helper/test-hashmap.c to
* unit-tests/t-hashmap.c, 2024-08-03). See the log message of that
* commit for the reason why this is still here.
*/
int cmd__hashmap(int argc UNUSED, const char **argv UNUSED)
{
struct string_list parts = STRING_LIST_INIT_NODUP;
struct strbuf line = STRBUF_INIT;
/* process commands from stdin */
while (strbuf_getline(&line, stdin) != EOF) {
char *cmd, *p1, *p2;
/* break line into command and up to two parameters */
string_list_setlen(&parts, 0);
string_list_split_in_place_f(&parts, line.buf, DELIM, 2,
STRING_LIST_SPLIT_NONEMPTY);
/* ignore empty lines */
if (!parts.nr)
continue;
if (!*parts.items[0].string || *parts.items[0].string == '#')
continue;
cmd = parts.items[0].string;
p1 = parts.nr >= 1 ? parts.items[1].string : NULL;
p2 = parts.nr >= 2 ? parts.items[2].string : NULL;
if (!strcmp("perfhashmap", cmd) && p1 && p2) {
perf_hashmap(atoi(p1), atoi(p2));
} else {
printf("Unknown command %s\n", cmd);
}
}
string_list_clear(&parts, 0);
strbuf_release(&line);
return 0;
}
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