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) ? FALSE : TRUE;
  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   /* FIXME: there should probably be no default here, only in the
  70      skeletons.  */
  71
  72   /* Default #line formatting.  */
  73   MUSCLE_INSERT_STRING ("linef", "#line %d %s\n");
  74 }
  75
  76
  77 /*------------------------------------------------------------.
  78 | Free all the memory consumed by the muscle machinery only.  |
  79 `------------------------------------------------------------*/
  80
  81 void
  82 muscle_free (void)
  83 {
  84   hash_free (muscle_table);
  85   obstack_free (&muscle_obstack, NULL);
  86 }
  87
  88
  89
  90 /*------------------------------------------------------------.
  91 | Insert (KEY, VALUE).  If KEY already existed, overwrite the |
  92 | previous value.                                             |
  93 `------------------------------------------------------------*/
  94
  95 void
  96 muscle_insert (const char *key, char *value)
  97 {
  98   muscle_entry_t probe;
  99   muscle_entry_t *entry = NULL;
 100
 101   probe.key = key;
 102   entry = hash_lookup (muscle_table, &probe);
 103
 104   if (!entry)
 105     {
 106       /* First insertion in the hash. */
 107       entry = XMALLOC (muscle_entry_t, 1);
 108       entry->key = key;
 109       hash_insert (muscle_table, entry);
 110     }
 111   entry->value = value;
 112 }
 113
 114
 115 /*-------------------------------------------------------------------.
 116 | Insert (KEY, VALUE).  If KEY already existed, overwrite the        |
 117 | previous value.  Uses MUSCLE_OBSTACK.  De-allocates the previously |
 118 | associated value.  VALUE and SEPARATOR are copied.                 |
 119 `-------------------------------------------------------------------*/
 120
 121 void
 122 muscle_grow (const char *key, const char *val, const char *separator)
 123 {
 124   muscle_entry_t probe;
 125   muscle_entry_t *entry = NULL;
 126
 127   probe.key = key;
 128   entry = hash_lookup (muscle_table, &probe);
 129
 130   if (!entry)
 131     {
 132       /* First insertion in the hash. */
 133       entry = XMALLOC (muscle_entry_t, 1);
 134       entry->key = key;
 135       hash_insert (muscle_table, entry);
 136       entry->value = xstrdup (val);
 137     }
 138   else
 139     {
 140       /* Grow the current value. */
 141       char *new_val;
 142       fprintf (stderr, "<= %s + %s\n", entry->value, val);
 143       obstack_sgrow (&muscle_obstack, entry->value);
 144       free (entry->value);
 145       obstack_sgrow (&muscle_obstack, separator);
 146       obstack_sgrow (&muscle_obstack, val);
 147       obstack_1grow (&muscle_obstack, 0);
 148       new_val = obstack_finish (&muscle_obstack);
 149       entry->value = xstrdup (new_val);
 150       fprintf (stderr, "=> %s\n", new_val);
 151       obstack_free (&muscle_obstack, new_val);
 152     }
 153 }
 154
 155
 156 /*-------------------------------------------------------------------.
 157 | MUSCLE is an M4 list of pairs.  Create or extend it with the pair  |
 158 | (A1, A2).  Note that because the muscle values are output *double* |
 159 | quoted, one needs to strip the first level of quotes to reach the  |
 160 | list itself.                                                       |
 161 `-------------------------------------------------------------------*/
 162
 163 void muscle_pair_list_grow (const char *muscle,
 164                             const char *a1, const char *a2)
 165 {
 166   char *pair;
 167   obstack_fgrow2 (&muscle_obstack, "[[[%s]], [[%s]]]", a1, a2);
 168   obstack_1grow (&muscle_obstack, 0);
 169   pair = obstack_finish (&muscle_obstack);
 170   muscle_grow (muscle, pair, ",\n");
 171   obstack_free (&muscle_obstack, pair);
 172 }
 173
 174 /*-------------------------------.
 175 | Find the value of muscle KEY.  |
 176 `-------------------------------*/
 177
 178 char*
 179 muscle_find (const char *key)
 180 {
 181   muscle_entry_t probe;
 182   muscle_entry_t *result = NULL;
 183
 184   probe.key = key;
 185   result = hash_lookup (muscle_table, &probe);
 186   return result ? result->value : NULL;
 187 }
 188
 189
 190 /*------------------------------------------------.
 191 | Output the definition of ENTRY as a m4_define.  |
 192 `------------------------------------------------*/
 193
 194 static int
 195 muscle_m4_output (muscle_entry_t *entry, FILE *out)
 196 {
 197   fprintf (out, "m4_define([b4_%s],\n", entry->key);
 198   fprintf (out, "[[%s]])\n\n\n", entry->value);
 199   return 1;
 200 }
 201
 202
 203 /*----------------------------------------------------------------.
 204 | Output the definition of all the current muscles into a list of |
 205 | m4_defines.                                                     |
 206 `----------------------------------------------------------------*/
 207
 208 void
 209 muscles_m4_output (FILE *out)
 210 {
 211   hash_do_for_each (muscle_table,
 212                     (Hash_processor) muscle_m4_output,
 213                     out);
 214 }