src/uniqstr.c

   1 /* Keep a unique copy of strings.
   2
   3    Copyright (C) 2002 Free Software Foundation, Inc.
   4
   5    This file is part of Bison, the GNU Compiler Compiler.
   6
   7    Bison 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    Bison 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 Bison; see the file COPYING.  If not, write to
  19    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "system.h"
  23
  24 #include <error.h>
  25 #include <hash.h>
  26 #include <quotearg.h>
  27
  28 #include "uniqstr.h"
  29
  30 /*-----------------------.
  31 | A uniqstr hash table.  |
  32 `-----------------------*/
  33
  34 /* Initial capacity of uniqstr hash table.  */
  35 #define HT_INITIAL_CAPACITY 257
  36
  37 static struct hash_table *uniqstrs_table = NULL;
  38
  39 /*-------------------------------------.
  40 | Create the uniqstr for S if needed.  |
  41 `-------------------------------------*/
  42
  43 uniqstr
  44 uniqstr_new (char const *s)
  45 {
  46   uniqstr res = hash_lookup (uniqstrs_table, s);
  47   if (!res)
  48     {
  49       /* First insertion in the hash. */
  50       res = xstrdup (s);
  51       hash_insert (uniqstrs_table, res);
  52     }
  53   return res;
  54 }
  55
  56
  57 /*------------------------------.
  58 | Abort if S is not a uniqstr.  |
  59 `------------------------------*/
  60
  61 void
  62 uniqstr_assert (char const *s)
  63 {
  64   if (!hash_lookup (uniqstrs_table, s))
  65     {
  66       error (0, 0, "not a uniqstr: %s", quotearg (s));
  67       abort ();
  68     }
  69 }
  70
  71
  72 /*--------------------.
  73 | Print the uniqstr.  |
  74 `--------------------*/
  75
  76 static inline bool
  77 uniqstr_print (uniqstr s)
  78 {
  79   fprintf (stderr, "%s\n", s);
  80   return true;
  81 }
  82
  83 static bool
  84 uniqstr_print_processor (void *s, void *null ATTRIBUTE_UNUSED)
  85 {
  86   return uniqstr_print (s);
  87 }
  88
  89 \f
  90 /*-----------------------.
  91 | A uniqstr hash table.  |
  92 `-----------------------*/
  93
  94 static bool
  95 hash_compare_uniqstr (void const *m1, void const *m2)
  96 {
  97   return strcmp (m1, m2) == 0;
  98 }
  99
 100 static unsigned int
 101 hash_uniqstr (void const *m, unsigned int tablesize)
 102 {
 103   return hash_string (m, tablesize);
 104 }
 105
 106 /*----------------------------.
 107 | Create the uniqstrs table.  |
 108 `----------------------------*/
 109
 110 void
 111 uniqstrs_new (void)
 112 {
 113   uniqstrs_table = hash_initialize (HT_INITIAL_CAPACITY,
 114                                     NULL,
 115                                     hash_uniqstr,
 116                                     hash_compare_uniqstr,
 117                                     free);
 118 }
 119
 120
 121 /*-------------------------------------.
 122 | Perform a task on all the uniqstrs.  |
 123 `-------------------------------------*/
 124
 125 static void
 126 uniqstrs_do (Hash_processor processor, void *processor_data)
 127 {
 128   hash_do_for_each (uniqstrs_table, processor, processor_data);
 129 }
 130
 131
 132 /*-----------------.
 133 | Print them all.  |
 134 `-----------------*/
 135
 136 void
 137 uniqstrs_print (void)
 138 {
 139   uniqstrs_do (uniqstr_print_processor, NULL);
 140 }
 141
 142
 143 /*--------------------.
 144 | Free the uniqstrs.  |
 145 `--------------------*/
 146
 147 void
 148 uniqstrs_free (void)
 149 {
 150   hash_free (uniqstrs_table);
 151 }