gas/hash.h

   1 /* hash.h -- header file for gas hash table routines
   2    Copyright 1987, 1992, 1993, 1995, 1999, 2003, 2007
   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 3, 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, 51 Franklin Street - Fifth Floor, Boston, MA
  20    02110-1301, USA.  */
  21
  22 #ifndef HASH_H
  23 #define HASH_H
  24
  25 struct hash_control;
  26
  27 /* Set the size of the hash table used.  */
  28
  29 void set_gas_hash_table_size (unsigned long);
  30
  31 /* Create a hash table.  This return a control block.  */
  32
  33 extern struct hash_control *hash_new (void);
  34
  35 /* Delete a hash table, freeing all allocated memory.  */
  36
  37 extern void hash_die (struct hash_control *);
  38
  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.  */
  43
  44 extern const char *hash_insert (struct hash_control *,
  45                                 const char *key, PTR value);
  46
  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.  */
  50
  51 extern const char *hash_jam (struct hash_control *,
  52                              const char *key, PTR value);
  53
  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.  */
  57
  58 extern PTR hash_replace (struct hash_control *, const char *key,
  59                          PTR value);
  60
  61 /* Find an entry in a hash table, returning its value.  Returns NULL
  62    if the entry is not found.  */
  63
  64 extern PTR hash_find (struct hash_control *, const char *key);
  65
  66 /* As hash_find, but KEY is of length LEN and is not guaranteed to be
  67    NUL-terminated.  */
  68
  69 extern PTR hash_find_n (struct hash_control *, const char *key, size_t len);
  70
  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.  */
  73
  74 extern PTR hash_delete (struct hash_control *, const char *key);
  75
  76 /* Traverse a hash table.  Call the function on every entry in the
  77    hash table.  */
  78
  79 extern void hash_traverse (struct hash_control *,
  80                            void (*pfn) (const char *key, PTR value));
  81
  82 /* Print hash table statistics on the specified file.  NAME is the
  83    name of the hash table, used for printing a header.  */
  84
  85 extern void hash_print_statistics (FILE *, const char *name,
  86                                    struct hash_control *);
  87
  88 #endif /* HASH_H */