src/muscle_tab.c

   1 /* Muscle table manager for Bison.
   2
   3    Copyright (C) 2001, 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 <hash.h>
  25 #include <quotearg.h>
  26
  27 #include "files.h"
  28 #include "muscle_tab.h"
  29 #include "getargs.h"
  30
  31 typedef struct
  32 {
  33   const char *key;
  34   char *value;
  35 } muscle_entry;
  36
  37 /* An obstack used to create some entries.  */
  38 struct obstack muscle_obstack;
  39
  40 /* Initial capacity of muscles hash table.  */
  41 #define HT_INITIAL_CAPACITY 257
  42
  43 struct hash_table *muscle_table = NULL;
  44
  45 static bool
  46 hash_compare_muscles (void const *x, void const *y)
  47 {
  48   muscle_entry const *m1 = x;
  49   muscle_entry const *m2 = y;
  50   return strcmp (m1->key, m2->key) == 0;
  51 }
  52
  53 static unsigned int
  54 hash_muscle (const void *x, unsigned int tablesize)
  55 {
  56   muscle_entry const *m = x;
  57   return hash_string (m->key, tablesize);
  58 }
  59
  60 /*-----------------------------------------------------------------.
  61 | Create the MUSCLE_TABLE, and initialize it with default values.  |
  62 | Also set up the MUSCLE_OBSTACK.                                  |
  63 `-----------------------------------------------------------------*/
  64
  65 void
  66 muscle_init (void)
  67 {
  68   /* Initialize the muscle obstack.  */
  69   obstack_init (&muscle_obstack);
  70
  71   muscle_table = hash_initialize (HT_INITIAL_CAPACITY, NULL, hash_muscle,
  72                                   hash_compare_muscles, free);
  73
  74   /* Version and input file.  */
  75   MUSCLE_INSERT_STRING ("version", VERSION);
  76   MUSCLE_INSERT_C_STRING ("filename", grammar_file);
  77 }
  78
  79
  80 /*------------------------------------------------------------.
  81 | Free all the memory consumed by the muscle machinery only.  |
  82 `------------------------------------------------------------*/
  83
  84 void
  85 muscle_free (void)
  86 {
  87   hash_free (muscle_table);
  88   obstack_free (&muscle_obstack, NULL);
  89 }
  90
  91
  92
  93 /*------------------------------------------------------------.
  94 | Insert (KEY, VALUE).  If KEY already existed, overwrite the |
  95 | previous value.                                             |
  96 `------------------------------------------------------------*/
  97
  98 void
  99 muscle_insert (const char *key, char *value)
 100 {
 101   muscle_entry probe;
 102   muscle_entry *entry = NULL;
 103
 104   probe.key = key;
 105   entry = hash_lookup (muscle_table, &probe);
 106
 107   if (!entry)
 108     {
 109       /* First insertion in the hash. */
 110       MALLOC (entry, 1);
 111       entry->key = key;
 112       hash_insert (muscle_table, entry);
 113     }
 114   entry->value = value;
 115 }
 116
 117
 118 /*-------------------------------------------------------------------.
 119 | Insert (KEY, VALUE).  If KEY already existed, overwrite the        |
 120 | previous value.  Uses MUSCLE_OBSTACK.  De-allocates the previously |
 121 | associated value.  VALUE and SEPARATOR are copied.                 |
 122 `-------------------------------------------------------------------*/
 123
 124 void
 125 muscle_grow (const char *key, const char *val, const char *separator)
 126 {
 127   muscle_entry probe;
 128   muscle_entry *entry = NULL;
 129
 130   probe.key = key;
 131   entry = hash_lookup (muscle_table, &probe);
 132
 133   if (!entry)
 134     {
 135       /* First insertion in the hash. */
 136       MALLOC (entry, 1);
 137       entry->key = key;
 138       hash_insert (muscle_table, entry);
 139       entry->value = xstrdup (val);
 140     }
 141   else
 142     {
 143       /* Grow the current value. */
 144       char *new_val;
 145       obstack_sgrow (&muscle_obstack, entry->value);
 146       free (entry->value);
 147       obstack_sgrow (&muscle_obstack, separator);
 148       obstack_sgrow (&muscle_obstack, val);
 149       obstack_1grow (&muscle_obstack, 0);
 150       new_val = obstack_finish (&muscle_obstack);
 151       entry->value = xstrdup (new_val);
 152       obstack_free (&muscle_obstack, new_val);
 153     }
 154 }
 155
 156
 157 /*-------------------------------------------------------------------.
 158 | MUSCLE is an M4 list of pairs.  Create or extend it with the pair  |
 159 | (A1, A2).  Note that because the muscle values are output *double* |
 160 | quoted, one needs to strip the first level of quotes to reach the  |
 161 | list itself.                                                       |
 162 `-------------------------------------------------------------------*/
 163
 164 void muscle_pair_list_grow (const char *muscle,
 165                             const char *a1, const char *a2)
 166 {
 167   char *pair;
 168   obstack_fgrow2 (&muscle_obstack, "[[[%s]], [[%s]]]", a1, a2);
 169   obstack_1grow (&muscle_obstack, 0);
 170   pair = obstack_finish (&muscle_obstack);
 171   muscle_grow (muscle, pair, ",\n");
 172   obstack_free (&muscle_obstack, pair);
 173 }
 174
 175 /*-------------------------------.
 176 | Find the value of muscle KEY.  |
 177 `-------------------------------*/
 178
 179 char*
 180 muscle_find (const char *key)
 181 {
 182   muscle_entry probe;
 183   muscle_entry *result = NULL;
 184
 185   probe.key = key;
 186   result = hash_lookup (muscle_table, &probe);
 187   return result ? result->value : NULL;
 188 }
 189
 190
 191 /*------------------------------------------------.
 192 | Output the definition of ENTRY as a m4_define.  |
 193 `------------------------------------------------*/
 194
 195 static inline bool
 196 muscle_m4_output (muscle_entry *entry, FILE *out)
 197 {
 198   fprintf (out, "m4_define([b4_%s],\n", entry->key);
 199   fprintf (out, "[[%s]])\n\n\n", entry->value);
 200   return true;
 201 }
 202
 203 static bool
 204 muscle_m4_output_processor (void *entry, void *out)
 205 {
 206   return muscle_m4_output (entry, out);
 207 }
 208
 209
 210 /*----------------------------------------------------------------.
 211 | Output the definition of all the current muscles into a list of |
 212 | m4_defines.                                                     |
 213 `----------------------------------------------------------------*/
 214
 215 void
 216 muscles_m4_output (FILE *out)
 217 {
 218   hash_do_for_each (muscle_table, muscle_m4_output_processor, out);
 219 }