Ejemplo n.º 1
0
Archivo: name-hash.c Proyecto: 0369/git
static struct dir_entry *hash_dir_entry(struct index_state *istate,
		struct cache_entry *ce, int namelen)
{
	/*
	 * Throw each directory component in the hash for quick lookup
	 * during a git status. Directory components are stored without their
	 * closing slash.  Despite submodules being a directory, they never
	 * reach this point, because they are stored
	 * in index_state.name_hash (as ordinary cache_entries).
	 */
	struct dir_entry *dir;

	/* get length of parent directory */
	while (namelen > 0 && !is_dir_sep(ce->name[namelen - 1]))
		namelen--;
	if (namelen <= 0)
		return NULL;
	namelen--;

	/* lookup existing entry for that directory */
	dir = find_dir_entry(istate, ce->name, namelen);
	if (!dir) {
		/* not found, create it and add to hash table */
		FLEX_ALLOC_MEM(dir, name, ce->name, namelen);
		hashmap_entry_init(dir, memihash(ce->name, namelen));
		dir->namelen = namelen;
		hashmap_add(&istate->dir_hash, dir);

		/* recursively add missing parent directories */
		dir->parent = hash_dir_entry(istate, ce, namelen);
	}
	return dir;
}
Ejemplo n.º 2
0
Archivo: name-hash.c Proyecto: 0369/git
static struct dir_entry *find_dir_entry(struct index_state *istate,
		const char *name, unsigned int namelen)
{
	struct dir_entry key;
	hashmap_entry_init(&key, memihash(name, namelen));
	key.namelen = namelen;
	return hashmap_get(&istate->dir_hash, &key, name);
}
Ejemplo n.º 3
0
Archivo: name-hash.c Proyecto: 0369/git
static void hash_index_entry(struct index_state *istate, struct cache_entry *ce)
{
	if (ce->ce_flags & CE_HASHED)
		return;
	ce->ce_flags |= CE_HASHED;
	hashmap_entry_init(ce, memihash(ce->name, ce_namelen(ce)));
	hashmap_add(&istate->name_hash, ce);

	if (ignore_case)
		add_dir_entry(istate, ce);
}
Ejemplo n.º 4
0
Archivo: name-hash.c Proyecto: 0369/git
struct cache_entry *index_file_exists(struct index_state *istate, const char *name, int namelen, int icase)
{
	struct cache_entry *ce;

	lazy_init_name_hash(istate);

	ce = hashmap_get_from_hash(&istate->name_hash,
				   memihash(name, namelen), NULL);
	while (ce) {
		if (same_name(ce, name, namelen, icase))
			return ce;
		ce = hashmap_get_next(&istate->name_hash, ce);
	}
	return NULL;
}
Ejemplo n.º 5
0
static struct dir_entry *hash_dir_entry_with_parent_and_prefix(
	struct index_state *istate,
	struct dir_entry *parent,
	struct strbuf *prefix)
{
	struct dir_entry *dir;
	unsigned int hash;
	int lock_nr;

	/*
	 * Either we have a parent directory and path with slash(es)
	 * or the directory is an immediate child of the root directory.
	 */
	assert((parent != NULL) ^ (strchr(prefix->buf, '/') == NULL));

	if (parent)
		hash = memihash_cont(parent->ent.hash,
			prefix->buf + parent->namelen,
			prefix->len - parent->namelen);
	else
		hash = memihash(prefix->buf, prefix->len);

	lock_nr = compute_dir_lock_nr(&istate->dir_hash, hash);
	lock_dir_mutex(lock_nr);

	dir = find_dir_entry__hash(istate, prefix->buf, prefix->len, hash);
	if (!dir) {
		FLEX_ALLOC_MEM(dir, name, prefix->buf, prefix->len);
		hashmap_entry_init(dir, hash);
		dir->namelen = prefix->len;
		dir->parent = parent;
		hashmap_add(&istate->dir_hash, dir);

		if (parent) {
			unlock_dir_mutex(lock_nr);

			/* All I really need here is an InterlockedIncrement(&(parent->nr)) */
			lock_nr = compute_dir_lock_nr(&istate->dir_hash, parent->ent.hash);
			lock_dir_mutex(lock_nr);
			parent->nr++;
		}
	}

	unlock_dir_mutex(lock_nr);

	return dir;
}
Ejemplo n.º 6
0
/*
 * 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) {

			/* lookup entry in hashmap */
			entry = hashmap_get_from_hash(&map, hash, 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("intern", cmd) && l1) {

			/* test that strintern works */
			const char *i1 = strintern(p1);
			const char *i2 = strintern(p1);
			if (strcmp(i1, p1))
				printf("strintern(%s) returns %s\n", p1, i1);
			else if (i1 == p1)
				printf("strintern(%s) returns input pointer\n", p1);
			else if (i1 != i2)
				printf("strintern(%s) != strintern(%s)", i1, i2);
			else
				printf("%s\n", i1);

		} 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;
}
Ejemplo n.º 7
0
/*
 * Calculates the hash code of an fsentry structure's path.
 */
static unsigned int fsentry_hash(const struct fsentry *fse)
{
	unsigned int hash = fse->list ? fse->list->ent.hash : 0;
	return hash ^ memihash(fse->name, fse->len);
}
Ejemplo n.º 8
0
static int handle_range_1(
	struct index_state *istate,
	int k_start,
	int k_end,
	struct dir_entry *parent,
	struct strbuf *prefix,
	struct lazy_entry *lazy_entries)
{
	int input_prefix_len = prefix->len;
	int k = k_start;

	while (k < k_end) {
		struct cache_entry *ce_k = istate->cache[k];
		const char *name, *slash;

		if (prefix->len && strncmp(ce_k->name, prefix->buf, prefix->len))
			break;

		name = ce_k->name + prefix->len;
		slash = strchr(name, '/');

		if (slash) {
			int len = slash - name;
			int processed;
			struct dir_entry *dir_new;

			strbuf_add(prefix, name, len);
			processed = handle_range_dir(istate, k, k_end, parent, prefix, lazy_entries, &dir_new);
			if (processed) {
				k += processed;
				strbuf_setlen(prefix, input_prefix_len);
				continue;
			}

			strbuf_addch(prefix, '/');
			processed = handle_range_1(istate, k, k_end, dir_new, prefix, lazy_entries);
			k += processed;
			strbuf_setlen(prefix, input_prefix_len);
			continue;
		}

		/*
		 * It is too expensive to take a lock to insert "ce_k"
		 * into "istate->name_hash" and increment the ref-count
		 * on the "parent" dir.  So we defer actually updating
		 * permanent data structures until phase 2 (where we
		 * can change the locking requirements) and simply
		 * accumulate our current results into the lazy_entries
		 * data array).
		 *
		 * We do not need to lock the lazy_entries array because
		 * we have exclusive access to the cells in the range
		 * [k_start,k_end) that this thread was given.
		 */
		lazy_entries[k].dir = parent;
		if (parent) {
			lazy_entries[k].hash_name = memihash_cont(
				parent->ent.hash,
				ce_k->name + parent->namelen,
				ce_namelen(ce_k) - parent->namelen);
			lazy_entries[k].hash_dir = parent->ent.hash;
		} else {
			lazy_entries[k].hash_name = memihash(ce_k->name, ce_namelen(ce_k));
		}

		k++;
	}

	return k - k_start;
}
Ejemplo n.º 9
0
static struct dir_entry *find_dir_entry(struct index_state *istate,
		const char *name, unsigned int namelen)
{
	return find_dir_entry__hash(istate, name, namelen, memihash(name, namelen));
}