gas/hash.h

   1 /* hash.h -- header file for gas hash table routines
   2    Copyright 1987, 1992, 1993, 1995, 1999, 2003
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GAS, the GNU Assembler.
   6
   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.
  11
  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.
  16
  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, 59 Temple Place - Suite 330, Boston, MA
  20    02111-1307, USA.  */
  21
  22 #ifndef HASH_H
  23 #define HASH_H
  24
  25 struct hash_control;
  26
  27 /* Create a hash table.  This return a control block.  */
  28
  29 extern struct hash_control *hash_new (void);
  30
  31 /* Delete a hash table, freeing all allocated memory.  */
  32
  33 extern void hash_die (struct hash_control *);
  34
  35 /* Insert an entry into a hash table.  This returns NULL on success.
  36    On error, it returns a printable string indicating the error.  It
  37    is considered to be an error if the entry already exists in the
  38    hash table.  */
  39
  40 extern const char *hash_insert (struct hash_control *,
  41                                 const char *key, PTR value);
  42
  43 /* Insert or replace an entry in a hash table.  This returns NULL on
  44    success.  On error, it returns a printable string indicating the
  45    error.  If an entry already exists, its value is replaced.  */
  46
  47 extern const char *hash_jam (struct hash_control *,
  48                              const char *key, PTR value);
  49
  50 /* Replace an existing entry in a hash table.  This returns the old
  51    value stored for the entry.  If the entry is not found in the hash
  52    table, this does nothing and returns NULL.  */
  53
  54 extern PTR hash_replace (struct hash_control *, const char *key,
  55                          PTR value);
  56
  57 /* Find an entry in a hash table, returning its value.  Returns NULL
  58    if the entry is not found.  */
  59
  60 extern PTR hash_find (struct hash_control *, const char *key);
  61
  62 /* As hash_find, but KEY is of length LEN and is not guaranteed to be
  63    NUL-terminated.  */
  64
  65 extern PTR hash_find_n (struct hash_control *, const char *key, size_t len);
  66
  67 /* Delete an entry from a hash table.  This returns the value stored
  68    for that entry, or NULL if there is no such entry.  */
  69
  70 extern PTR hash_delete (struct hash_control *, const char *key);
  71
  72 /* Traverse a hash table.  Call the function on every entry in the
  73    hash table.  */
  74
  75 extern void hash_traverse (struct hash_control *,
  76                            void (*pfn) (const char *key, PTR value));
  77
  78 /* Print hash table statistics on the specified file.  NAME is the
  79    name of the hash table, used for printing a header.  */
  80
  81 extern void hash_print_statistics (FILE *, const char *name,
  82                                    struct hash_control *);
  83
  84 #endif /* HASH_H */