src/muscle_tab.c

   1 /* Muscle table manager for Bison,
   2    Copyright (C) 2001, 2002 Free Software Foundation, Inc.
   3
   4    This file is part of Bison, the GNU Compiler Compiler.
   5
   6    Bison 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    Bison 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 Bison; see the file COPYING.  If not, write to
  18    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "system.h"
  22 #include "hash.h"
  23 #include "files.h"
  24 #include "muscle_tab.h"
  25 #include "getargs.h"
  26
  27
  28 /* An obstack used to create some entries.  */
  29 struct obstack muscle_obstack;
  30
  31 /* Initial capacity of muscles hash table.  */
  32 #define HT_INITIAL_CAPACITY 257
  33
  34 struct hash_table *muscle_table = NULL;
  35
  36 static bool
  37 hash_compare_muscles (void const *x, void const *y)
  38 {
  39   const muscle_entry_t *m1 = x;
  40   const muscle_entry_t *m2 = y;
  41   return strcmp (m1->key, m2->key) == 0;
  42 }
  43
  44 static unsigned int
  45 hash_muscle (const void *x, unsigned int tablesize)
  46 {
  47   const muscle_entry_t *m = x;
  48   return hash_string (m->key, tablesize);
  49 }
  50
  51 /*-----------------------------------------------------------------.
  52 | Create the MUSCLE_TABLE, and initialize it with default values.  |
  53 | Also set up the MUSCLE_OBSTACK.                                  |
  54 `-----------------------------------------------------------------*/
  55
  56 void
  57 muscle_init (void)
  58 {
  59   /* Initialize the muscle obstack.  */
  60   obstack_init (&muscle_obstack);
  61
  62   muscle_table = hash_initialize (HT_INITIAL_CAPACITY, NULL, hash_muscle,
  63                                   hash_compare_muscles, free);
  64
  65   /* Version and input file.  */
  66   MUSCLE_INSERT_STRING ("version", VERSION);
  67   MUSCLE_INSERT_STRING ("filename", infile);
  68 }
  69
  70
  71 /*------------------------------------------------------------.
  72 | Free all the memory consumed by the muscle machinery only.  |
  73 `------------------------------------------------------------*/
  74
  75 void
  76 muscle_free (void)
  77 {
  78   hash_free (muscle_table);
  79   obstack_free (&muscle_obstack, NULL);
  80 }
  81
  82
  83
  84 /*------------------------------------------------------------.
  85 | Insert (KEY, VALUE).  If KEY already existed, overwrite the |
  86 | previous value.                                             |
  87 `------------------------------------------------------------*/
  88
  89 void
  90 muscle_insert (const char *key, char *value)
  91 {
  92   muscle_entry_t probe;
  93   muscle_entry_t *entry = NULL;
  94
  95   probe.key = key;
  96   entry = hash_lookup (muscle_table, &probe);
  97
  98   if (!entry)
  99     {
 100       /* First insertion in the hash. */
 101       entry = XMALLOC (muscle_entry_t, 1);
 102       entry->key = key;
 103       hash_insert (muscle_table, entry);
 104     }
 105   entry->value = value;
 106 }
 107
 108
 109 /*-------------------------------------------------------------------.
 110 | Insert (KEY, VALUE).  If KEY already existed, overwrite the        |
 111 | previous value.  Uses MUSCLE_OBSTACK.  De-allocates the previously |
 112 | associated value.  VALUE and SEPARATOR are copied.                 |
 113 `-------------------------------------------------------------------*/
 114
 115 void
 116 muscle_grow (const char *key, const char *val, const char *separator)
 117 {
 118   muscle_entry_t probe;
 119   muscle_entry_t *entry = NULL;
 120
 121   probe.key = key;
 122   entry = hash_lookup (muscle_table, &probe);
 123
 124   if (!entry)
 125     {
 126       /* First insertion in the hash. */
 127       entry = XMALLOC (muscle_entry_t, 1);
 128       entry->key = key;
 129       hash_insert (muscle_table, entry);
 130       entry->value = xstrdup (val);
 131     }
 132   else
 133     {
 134       /* Grow the current value. */
 135       char *new_val;
 136       obstack_sgrow (&muscle_obstack, entry->value);
 137       free (entry->value);
 138       obstack_sgrow (&muscle_obstack, separator);
 139       obstack_sgrow (&muscle_obstack, val);
 140       obstack_1grow (&muscle_obstack, 0);
 141       new_val = obstack_finish (&muscle_obstack);
 142       entry->value = xstrdup (new_val);
 143       obstack_free (&muscle_obstack, new_val);
 144     }
 145 }
 146
 147
 148 /*-------------------------------------------------------------------.
 149 | MUSCLE is an M4 list of pairs.  Create or extend it with the pair  |
 150 | (A1, A2).  Note that because the muscle values are output *double* |
 151 | quoted, one needs to strip the first level of quotes to reach the  |
 152 | list itself.                                                       |
 153 `-------------------------------------------------------------------*/
 154
 155 void muscle_pair_list_grow (const char *muscle,
 156                             const char *a1, const char *a2)
 157 {
 158   char *pair;
 159   obstack_fgrow2 (&muscle_obstack, "[[[%s]], [[%s]]]", a1, a2);
 160   obstack_1grow (&muscle_obstack, 0);
 161   pair = obstack_finish (&muscle_obstack);
 162   muscle_grow (muscle, pair, ",\n");
 163   obstack_free (&muscle_obstack, pair);
 164 }
 165
 166 /*-------------------------------.
 167 | Find the value of muscle KEY.  |
 168 `-------------------------------*/
 169
 170 char*
 171 muscle_find (const char *key)
 172 {
 173   muscle_entry_t probe;
 174   muscle_entry_t *result = NULL;
 175
 176   probe.key = key;
 177   result = hash_lookup (muscle_table, &probe);
 178   return result ? result->value : NULL;
 179 }
 180
 181
 182 /*------------------------------------------------.
 183 | Output the definition of ENTRY as a m4_define.  |
 184 `------------------------------------------------*/
 185
 186 static int
 187 muscle_m4_output (muscle_entry_t *entry, FILE *out)
 188 {
 189   fprintf (out, "m4_define([b4_%s],\n", entry->key);
 190   fprintf (out, "[[%s]])\n\n\n", entry->value);
 191   return 1;
 192 }
 193
 194
 195 /*----------------------------------------------------------------.
 196 | Output the definition of all the current muscles into a list of |
 197 | m4_defines.                                                     |
 198 `----------------------------------------------------------------*/
 199
 200 void
 201 muscles_m4_output (FILE *out)
 202 {
 203   hash_do_for_each (muscle_table,
 204                     (Hash_processor) muscle_m4_output,
 205                     out);
 206 }