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[binutils.git] / gas / hash.h
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1 /* hash.h -- header file for gas hash table routines
2 Copyright 1987, 1992, 1993, 1995, 1999, 2003
3 Free Software Foundation, Inc.
5 This file is part of GAS, the GNU Assembler.
7 GAS is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
10 any later version.
12 GAS is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GAS; see the file COPYING. If not, write to the Free
19 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
20 02110-1301, USA. */
22 #ifndef HASH_H
23 #define HASH_H
25 struct hash_control;
27 /* Set the size of the hash table used. */
29 void set_gas_hash_table_size (unsigned long);
31 /* Create a hash table. This return a control block. */
33 extern struct hash_control *hash_new (void);
35 /* Delete a hash table, freeing all allocated memory. */
37 extern void hash_die (struct hash_control *);
39 /* Insert an entry into a hash table. This returns NULL on success.
40 On error, it returns a printable string indicating the error. It
41 is considered to be an error if the entry already exists in the
42 hash table. */
44 extern const char *hash_insert (struct hash_control *,
45 const char *key, PTR value);
47 /* Insert or replace an entry in a hash table. This returns NULL on
48 success. On error, it returns a printable string indicating the
49 error. If an entry already exists, its value is replaced. */
51 extern const char *hash_jam (struct hash_control *,
52 const char *key, PTR value);
54 /* Replace an existing entry in a hash table. This returns the old
55 value stored for the entry. If the entry is not found in the hash
56 table, this does nothing and returns NULL. */
58 extern PTR hash_replace (struct hash_control *, const char *key,
59 PTR value);
61 /* Find an entry in a hash table, returning its value. Returns NULL
62 if the entry is not found. */
64 extern PTR hash_find (struct hash_control *, const char *key);
66 /* As hash_find, but KEY is of length LEN and is not guaranteed to be
67 NUL-terminated. */
69 extern PTR hash_find_n (struct hash_control *, const char *key, size_t len);
71 /* Delete an entry from a hash table. This returns the value stored
72 for that entry, or NULL if there is no such entry. */
74 extern PTR hash_delete (struct hash_control *, const char *key);
76 /* Traverse a hash table. Call the function on every entry in the
77 hash table. */
79 extern void hash_traverse (struct hash_control *,
80 void (*pfn) (const char *key, PTR value));
82 /* Print hash table statistics on the specified file. NAME is the
83 name of the hash table, used for printing a header. */
85 extern void hash_print_statistics (FILE *, const char *name,
86 struct hash_control *);
88 #endif /* HASH_H */