src/gram.c

   1 /* Allocate input grammar variables for Bison.
   2
   3    Copyright (C) 1984, 1986, 1989, 2001-2003, 2005-2012 Free Software
   4    Foundation, Inc.
   5
   6    This file is part of Bison, the GNU Compiler Compiler.
   7
   8    This program is free software: you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation, either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include <config.h>
  22 #include "system.h"
  23
  24 #include "complain.h"
  25 #include "getargs.h"
  26 #include "gram.h"
  27 #include "print-xml.h"
  28 #include "reader.h"
  29 #include "reduce.h"
  30 #include "symtab.h"
  31
  32 /* Comments for these variables are in gram.h.  */
  33
  34 item_number *ritem = NULL;
  35 unsigned int nritems = 0;
  36
  37 rule *rules = NULL;
  38 rule_number nrules = 0;
  39
  40 symbol **symbols = NULL;
  41 int nsyms = 0;
  42 int ntokens = 1;
  43 int nvars = 0;
  44
  45 symbol_number *token_translations = NULL;
  46
  47 int max_user_token_number = 256;
  48
  49 bool
  50 rule_useful_in_grammar_p (rule *r)
  51 {
  52   return r->number < nrules;
  53 }
  54
  55 bool
  56 rule_useless_in_grammar_p (rule *r)
  57 {
  58   return !rule_useful_in_grammar_p (r);
  59 }
  60
  61 bool
  62 rule_useless_in_parser_p (rule *r)
  63 {
  64   return !r->useful && rule_useful_in_grammar_p (r);
  65 }
  66
  67 void
  68 rule_lhs_print (rule *r, symbol *previous_lhs, FILE *out)
  69 {
  70   fprintf (out, "  %3d ", r->number);
  71   if (previous_lhs != r->lhs)
  72     {
  73       fprintf (out, "%s:", r->lhs->tag);
  74     }
  75   else
  76     {
  77       int n;
  78       for (n = strlen (previous_lhs->tag); n > 0; --n)
  79         fputc (' ', out);
  80       fputc ('|', out);
  81     }
  82 }
  83
  84 void
  85 rule_lhs_print_xml (rule *r, FILE *out, int level)
  86 {
  87   xml_printf (out, level, "<lhs>%s</lhs>", r->lhs->tag);
  88 }
  89
  90 size_t
  91 rule_rhs_length (rule *r)
  92 {
  93   size_t res = 0;
  94   item_number *rhsp;
  95   for (rhsp = r->rhs; *rhsp >= 0; ++rhsp)
  96     ++res;
  97   return res;
  98 }
  99
 100 void
 101 rule_rhs_print (rule *r, FILE *out)
 102 {
 103   if (*r->rhs >= 0)
 104     {
 105       item_number *rp;
 106       for (rp = r->rhs; *rp >= 0; rp++)
 107         fprintf (out, " %s", symbols[*rp]->tag);
 108       fputc ('\n', out);
 109     }
 110   else
 111     {
 112       fprintf (out, " /* %s */\n", _("empty"));
 113     }
 114 }
 115
 116 static void
 117 rule_rhs_print_xml (rule *r, FILE *out, int level)
 118 {
 119   if (*r->rhs >= 0)
 120     {
 121       item_number *rp;
 122       xml_puts (out, level, "<rhs>");
 123       for (rp = r->rhs; *rp >= 0; rp++)
 124         xml_printf (out, level + 1, "<symbol>%s</symbol>",
 125                     xml_escape (symbols[*rp]->tag));
 126       xml_puts (out, level, "</rhs>");
 127     }
 128   else
 129     {
 130       xml_puts (out, level, "<rhs>");
 131       xml_puts (out, level + 1, "<empty/>");
 132       xml_puts (out, level, "</rhs>");
 133     }
 134 }
 135
 136 void
 137 rule_print (rule *r, FILE *out)
 138 {
 139   fprintf (out, "%s:", r->lhs->tag);
 140   rule_rhs_print (r, out);
 141 }
 142
 143 void
 144 ritem_print (FILE *out)
 145 {
 146   unsigned int i;
 147   fputs ("RITEM\n", out);
 148   for (i = 0; i < nritems; ++i)
 149     if (ritem[i] >= 0)
 150       fprintf (out, "  %s", symbols[ritem[i]]->tag);
 151     else
 152       fprintf (out, "  (rule %d)\n", item_number_as_rule_number (ritem[i]));
 153   fputs ("\n\n", out);
 154 }
 155
 156 size_t
 157 ritem_longest_rhs (void)
 158 {
 159   int max = 0;
 160   rule_number r;
 161
 162   for (r = 0; r < nrules; ++r)
 163     {
 164       int length = rule_rhs_length (&rules[r]);
 165       if (length > max)
 166         max = length;
 167     }
 168
 169   return max;
 170 }
 171
 172 void
 173 grammar_rules_partial_print (FILE *out, const char *title,
 174                              rule_filter filter)
 175 {
 176   rule_number r;
 177   bool first = true;
 178   symbol *previous_lhs = NULL;
 179
 180   /* rule # : LHS -> RHS */
 181   for (r = 0; r < nrules + nuseless_productions; r++)
 182     {
 183       if (filter && !filter (&rules[r]))
 184         continue;
 185       if (first)
 186         fprintf (out, "%s\n\n", title);
 187       else if (previous_lhs && previous_lhs != rules[r].lhs)
 188         fputc ('\n', out);
 189       first = false;
 190       rule_lhs_print (&rules[r], previous_lhs, out);
 191       rule_rhs_print (&rules[r], out);
 192       previous_lhs = rules[r].lhs;
 193     }
 194   if (!first)
 195     fputs ("\n\n", out);
 196 }
 197
 198 void
 199 grammar_rules_print (FILE *out)
 200 {
 201   grammar_rules_partial_print (out, _("Grammar"), rule_useful_in_grammar_p);
 202 }
 203
 204 void
 205 grammar_rules_print_xml (FILE *out, int level)
 206 {
 207   rule_number r;
 208   bool first = true;
 209
 210   for (r = 0; r < nrules + nuseless_productions; r++)
 211     {
 212       if (first)
 213         xml_puts (out, level + 1, "<rules>");
 214       first = false;
 215       {
 216         char const *usefulness;
 217         if (rule_useless_in_grammar_p (&rules[r]))
 218           usefulness = "useless-in-grammar";
 219         else if (rule_useless_in_parser_p (&rules[r]))
 220           usefulness = "useless-in-parser";
 221         else
 222           usefulness = "useful";
 223         xml_indent (out, level + 2);
 224         fprintf (out, "<rule number=\"%d\" usefulness=\"%s\"",
 225                  rules[r].number, usefulness);
 226         if (rules[r].precsym)
 227           fprintf (out, " percent_prec=\"%s\"",
 228                    xml_escape (rules[r].precsym->tag));
 229         fputs (">\n", out);
 230       }
 231       rule_lhs_print_xml (&rules[r], out, level + 3);
 232       rule_rhs_print_xml (&rules[r], out, level + 3);
 233       xml_puts (out, level + 2, "</rule>");
 234     }
 235   if (!first)
 236     xml_puts (out, level + 1, "</rules>");
 237   else
 238    xml_puts (out, level + 1, "<rules/>");
 239 }
 240
 241 void
 242 grammar_dump (FILE *out, const char *title)
 243 {
 244   fprintf (out, "%s\n\n", title);
 245   fprintf (out,
 246            "ntokens = %d, nvars = %d, nsyms = %d, nrules = %d, nritems = %d\n\n",
 247            ntokens, nvars, nsyms, nrules, nritems);
 248
 249
 250   fprintf (out, "Variables\n---------\n\n");
 251   {
 252     symbol_number i;
 253     fprintf (out, "Value  Sprec  Sassoc  Tag\n");
 254
 255     for (i = ntokens; i < nsyms; i++)
 256       fprintf (out, "%5d  %5d   %5d  %s\n",
 257                i,
 258                symbols[i]->prec, symbols[i]->assoc,
 259                symbols[i]->tag);
 260     fprintf (out, "\n\n");
 261   }
 262
 263   fprintf (out, "Rules\n-----\n\n");
 264   {
 265     rule_number i;
 266     fprintf (out, "Num (Prec, Assoc, Useful, Ritem Range) Lhs -> Rhs (Ritem range) [Num]\n");
 267     for (i = 0; i < nrules + nuseless_productions; i++)
 268       {
 269         rule *rule_i = &rules[i];
 270         item_number *rp = NULL;
 271         unsigned int rhs_itemno = rule_i->rhs - ritem;
 272         unsigned int rhs_count = 0;
 273         /* Find the last RHS index in ritems. */
 274         for (rp = rule_i->rhs; *rp >= 0; ++rp)
 275           ++rhs_count;
 276         fprintf (out, "%3d (%2d, %2d, %2d, %2u-%2u)   %2d ->",
 277                  i,
 278                  rule_i->prec ? rule_i->prec->prec : 0,
 279                  rule_i->prec ? rule_i->prec->assoc : 0,
 280                  rule_i->useful,
 281                  rhs_itemno,
 282                  rhs_itemno + rhs_count - 1,
 283                  rule_i->lhs->number);
 284         /* Dumped the RHS. */
 285         for (rp = rule_i->rhs; *rp >= 0; rp++)
 286           fprintf (out, " %3d", *rp);
 287         fprintf (out, "  [%d]\n", item_number_as_rule_number (*rp));
 288       }
 289   }
 290   fprintf (out, "\n\n");
 291
 292   fprintf (out, "Rules interpreted\n-----------------\n\n");
 293   {
 294     rule_number r;
 295     for (r = 0; r < nrules + nuseless_productions; r++)
 296       {
 297         fprintf (out, "%-5d  ", r);
 298         rule_print (&rules[r], out);
 299       }
 300   }
 301   fprintf (out, "\n\n");
 302 }
 303
 304 void
 305 grammar_rules_useless_report (const char *message)
 306 {
 307   rule_number r;
 308   for (r = 0; r < nrules ; ++r)
 309     if (!rules[r].useful)
 310       {
 311         warn_at (rules[r].location, "%s: ", message);
 312         if (warnings_flag & warnings_other)
 313           {
 314             rule_print (&rules[r], stderr);
 315             fflush (stderr);
 316           }
 317       }
 318 }
 319
 320 void
 321 grammar_free (void)
 322 {
 323   if (ritem)
 324     free (ritem - 1);
 325   free (rules);
 326   free (token_translations);
 327   /* Free the symbol table data structure.  */
 328   symbols_free ();
 329   free_merger_functions ();
 330 }