gas/hash.h

   1 /* hash.h -- header file for gas hash table routines
   2    Copyright 1987, 1992, 1993, 1995, 1999 Free Software Foundation, Inc.
   3
   4    This file is part of GAS, the GNU Assembler.
   5
   6    GAS is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    GAS is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GAS; see the file COPYING.  If not, write to the Free
  18    Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  19    02111-1307, USA.  */
  20
  21 #ifndef HASH_H
  22 #define HASH_H
  23
  24 struct hash_control;
  25
  26 /* Create a hash table.  This return a control block.  */
  27
  28 extern struct hash_control *hash_new (void);
  29
  30 /* Delete a hash table, freeing all allocated memory.  */
  31
  32 extern void hash_die (struct hash_control *);
  33
  34 /* Insert an entry into a hash table.  This returns NULL on success.
  35    On error, it returns a printable string indicating the error.  It
  36    is considered to be an error if the entry already exists in the
  37    hash table.  */
  38
  39 extern const char *hash_insert (struct hash_control *,
  40                                 const char *key, PTR value);
  41
  42 /* Insert or replace an entry in a hash table.  This returns NULL on
  43    success.  On error, it returns a printable string indicating the
  44    error.  If an entry already exists, its value is replaced.  */
  45
  46 extern const char *hash_jam (struct hash_control *,
  47                              const char *key, PTR value);
  48
  49 /* Replace an existing entry in a hash table.  This returns the old
  50    value stored for the entry.  If the entry is not found in the hash
  51    table, this does nothing and returns NULL.  */
  52
  53 extern PTR hash_replace (struct hash_control *, const char *key,
  54                          PTR value);
  55
  56 /* Find an entry in a hash table, returning its value.  Returns NULL
  57    if the entry is not found.  */
  58
  59 extern PTR hash_find (struct hash_control *, const char *key);
  60
  61 /* Delete an entry from a hash table.  This returns the value stored
  62    for that entry, or NULL if there is no such entry.  */
  63
  64 extern PTR hash_delete (struct hash_control *, const char *key);
  65
  66 /* Traverse a hash table.  Call the function on every entry in the
  67    hash table.  */
  68
  69 extern void hash_traverse (struct hash_control *,
  70                            void (*pfn) (const char *key, PTR value));
  71
  72 /* Print hash table statistics on the specified file.  NAME is the
  73    name of the hash table, used for printing a header.  */
  74
  75 extern void hash_print_statistics (FILE *, const char *name,
  76                                    struct hash_control *);
  77
  78 #endif /* HASH_H */