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/* hash.h -- header file for gas hash table routines
Copyright (C) 1987-2021 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to the Free
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
#ifndef HASH_H
#define HASH_H
/* Insert ELEMENT into HTAB. If REPLACE is non-zero existing elements
are overwritten. If ELEMENT already exists, a pointer to the slot
is returned. Otherwise NULL is returned. */
extern void **htab_insert (htab_t, void * /* element */, int /* replace */);
/* Print statistics about a hash table. */
extern void htab_print_statistics (FILE *f, const char *name, htab_t table);
/* String hash table functions. */
struct string_tuple
{
const char *key;
const void *value;
};
typedef struct string_tuple string_tuple_t;
/* Hash function for a string_tuple. */
static hashval_t
hash_string_tuple (const void *e)
{
string_tuple_t *tuple = (string_tuple_t *) e;
return htab_hash_string (tuple->key);
}
/* Equality function for a string_tuple. */
static int
eq_string_tuple (const void *a, const void *b)
{
const string_tuple_t *ea = (const string_tuple_t *) a;
const string_tuple_t *eb = (const string_tuple_t *) b;
return strcmp (ea->key, eb->key) == 0;
}
static inline string_tuple_t *
string_tuple_alloc (const char *key, const void *value)
{
string_tuple_t *tuple = XNEW (string_tuple_t);
tuple->key = key;
tuple->value = value;
return tuple;
}
static inline void *
str_hash_find (htab_t table, const char *key)
{
string_tuple_t needle = { key, NULL };
string_tuple_t *tuple = htab_find (table, &needle);
return tuple != NULL ? (void *) tuple->value : NULL;
}
static inline void *
str_hash_find_n (htab_t table, const char *key, size_t n)
{
char *tmp = XNEWVEC (char, n + 1);
memcpy (tmp, key, n);
tmp[n] = '\0';
string_tuple_t needle = { tmp, NULL };
string_tuple_t *tuple = htab_find (table, &needle);
free (tmp);
return tuple != NULL ? (void *) tuple->value : NULL;
}
static inline void
str_hash_delete (htab_t table, const char *key)
{
string_tuple_t needle = { key, NULL };
htab_remove_elt (table, &needle);
}
static inline void **
str_hash_insert (htab_t table, const char *key, const void *value, int replace)
{
string_tuple_t *elt = string_tuple_alloc (key, value);
void **slot = htab_insert (table, elt, replace);
if (slot && !replace)
free (elt);
return slot;
}
static inline htab_t
str_htab_create (void)
{
return htab_create_alloc (16, hash_string_tuple, eq_string_tuple,
NULL, xcalloc, free);
}
#endif /* HASH_H */
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