118 lines
3.1 KiB
C
118 lines
3.1 KiB
C
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/* hash.h -- header file for gas hash table routines
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Copyright (C) 1987-2022 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#ifndef HASH_H
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#define HASH_H
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/* Insert ELEMENT into HTAB. If REPLACE is non-zero existing elements
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are overwritten. If ELEMENT already exists, a pointer to the slot
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is returned. Otherwise NULL is returned. */
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extern void **htab_insert (htab_t, void * /* element */, int /* replace */);
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/* Print statistics about a hash table. */
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extern void htab_print_statistics (FILE *f, const char *name, htab_t table);
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/* String hash table functions. */
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struct string_tuple
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{
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const char *key;
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const void *value;
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};
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typedef struct string_tuple string_tuple_t;
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/* Hash function for a string_tuple. */
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static hashval_t
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hash_string_tuple (const void *e)
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{
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string_tuple_t *tuple = (string_tuple_t *) e;
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return htab_hash_string (tuple->key);
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}
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/* Equality function for a string_tuple. */
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static int
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eq_string_tuple (const void *a, const void *b)
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{
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const string_tuple_t *ea = (const string_tuple_t *) a;
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const string_tuple_t *eb = (const string_tuple_t *) b;
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return strcmp (ea->key, eb->key) == 0;
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}
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static inline string_tuple_t *
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string_tuple_alloc (const char *key, const void *value)
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{
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string_tuple_t *tuple = XNEW (string_tuple_t);
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tuple->key = key;
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tuple->value = value;
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return tuple;
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}
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static inline void *
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str_hash_find (htab_t table, const char *key)
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{
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string_tuple_t needle = { key, NULL };
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string_tuple_t *tuple = htab_find (table, &needle);
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return tuple != NULL ? (void *) tuple->value : NULL;
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}
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static inline void *
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str_hash_find_n (htab_t table, const char *key, size_t n)
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{
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char *tmp = XNEWVEC (char, n + 1);
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memcpy (tmp, key, n);
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tmp[n] = '\0';
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string_tuple_t needle = { tmp, NULL };
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string_tuple_t *tuple = htab_find (table, &needle);
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free (tmp);
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return tuple != NULL ? (void *) tuple->value : NULL;
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}
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static inline void
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str_hash_delete (htab_t table, const char *key)
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{
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string_tuple_t needle = { key, NULL };
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htab_remove_elt (table, &needle);
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}
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static inline void **
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str_hash_insert (htab_t table, const char *key, const void *value, int replace)
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{
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string_tuple_t *elt = string_tuple_alloc (key, value);
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void **slot = htab_insert (table, elt, replace);
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if (slot && !replace)
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free (elt);
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return slot;
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}
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static inline htab_t
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str_htab_create (void)
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{
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return htab_create_alloc (16, hash_string_tuple, eq_string_tuple,
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NULL, xcalloc, free);
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}
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#endif /* HASH_H */
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