src/print.c

   1 /* Print information on generated parser, for bison,
   2    Copyright 1984, 1986, 1989, 2000 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
  22 #include "system.h"
  23 #include "xalloc.h"
  24 #include "files.h"
  25 #include "gram.h"
  26 #include "LR0.h"
  27 #include "lalr.h"
  28 #include "conflicts.h"
  29 #include "getargs.h"
  30 #include "state.h"
  31 #include "reader.h"
  32 #include "print.h"
  33
  34 #if 0
  35 static void
  36 print_token (int extnum, int token)
  37 {
  38   obstack_fgrow2 (&output_obstack, _(" type %d is %s\n"), extnum, tags[token]);
  39 }
  40 #endif
  41
  42 \f
  43 /*================================\
  44 | Report information on a state.  |
  45 \================================*/
  46
  47 static void
  48 print_core (int state)
  49 {
  50   int i;
  51   int k;
  52   int rule;
  53   core *statep;
  54   short *sp;
  55   short *sp1;
  56
  57   statep = state_table[state];
  58   k = statep->nitems;
  59
  60   if (k == 0)
  61     return;
  62
  63   for (i = 0; i < k; i++)
  64     {
  65       sp1 = sp = ritem + statep->items[i];
  66
  67       while (*sp > 0)
  68         sp++;
  69
  70       rule = -(*sp);
  71       obstack_fgrow1 (&output_obstack, "    %s  ->  ", tags[rlhs[rule]]);
  72
  73       for (sp = ritem + rrhs[rule]; sp < sp1; sp++)
  74         {
  75           obstack_fgrow1 (&output_obstack, "%s ", tags[*sp]);
  76         }
  77
  78       obstack_1grow (&output_obstack, '.');
  79
  80       while (*sp > 0)
  81         {
  82           obstack_fgrow1 (&output_obstack, " %s", tags[*sp]);
  83           sp++;
  84         }
  85
  86       obstack_fgrow1 (&output_obstack, _("   (rule %d)"), rule);
  87       obstack_1grow (&output_obstack, '\n');
  88     }
  89
  90   obstack_1grow (&output_obstack, '\n');
  91 }
  92
  93 static void
  94 print_actions (int state)
  95 {
  96   int i;
  97   int k;
  98   int state1;
  99   int symbol;
 100   shifts *shiftp;
 101   errs *errp;
 102   reductions *redp;
 103   int rule;
 104
 105   shiftp = shift_table[state];
 106   redp = reduction_table[state];
 107   errp = err_table[state];
 108
 109   if (!shiftp && !redp)
 110     {
 111       if (final_state == state)
 112         obstack_sgrow (&output_obstack, _("    $default\taccept\n"));
 113       else
 114         obstack_sgrow (&output_obstack, _("    NO ACTIONS\n"));
 115       return;
 116     }
 117
 118   if (shiftp)
 119     {
 120       k = shiftp->nshifts;
 121
 122       for (i = 0; i < k; i++)
 123         {
 124           if (!shiftp->shifts[i])
 125             continue;
 126           state1 = shiftp->shifts[i];
 127           symbol = accessing_symbol[state1];
 128           /* The following line used to be turned off.  */
 129           if (ISVAR (symbol))
 130             break;
 131           if (symbol == 0)      /* I.e. strcmp(tags[symbol],"$")==0 */
 132             obstack_fgrow1 (&output_obstack,
 133                             _("    $   \tgo to state %d\n"), state1);
 134           else
 135             obstack_fgrow2 (&output_obstack,
 136                             _("    %-4s\tshift, and go to state %d\n"),
 137                             tags[symbol], state1);
 138         }
 139
 140       if (i > 0)
 141         obstack_1grow (&output_obstack, '\n');
 142     }
 143   else
 144     {
 145       i = 0;
 146       k = 0;
 147     }
 148
 149   if (errp)
 150     {
 151       int j, nerrs;
 152
 153       nerrs = errp->nerrs;
 154
 155       for (j = 0; j < nerrs; j++)
 156         {
 157           if (!errp->errs[j])
 158             continue;
 159           symbol = errp->errs[j];
 160           obstack_fgrow1 (&output_obstack, _("    %-4s\terror (nonassociative)\n"),
 161                    tags[symbol]);
 162         }
 163
 164       if (j > 0)
 165         obstack_1grow (&output_obstack, '\n');
 166     }
 167
 168   if (consistent[state] && redp)
 169     {
 170       rule = redp->rules[0];
 171       symbol = rlhs[rule];
 172       obstack_fgrow2 (&output_obstack,
 173                       _("    $default\treduce using rule %d (%s)\n\n"),
 174                       rule, tags[symbol]);
 175     }
 176   else if (redp)
 177     {
 178       print_reductions (state);
 179     }
 180
 181   if (i < k)
 182     {
 183       for (; i < k; i++)
 184         {
 185           if (!shiftp->shifts[i])
 186             continue;
 187           state1 = shiftp->shifts[i];
 188           symbol = accessing_symbol[state1];
 189           obstack_fgrow2 (&output_obstack,
 190                           _("    %-4s\tgo to state %d\n"),
 191                           tags[symbol], state1);
 192         }
 193
 194       obstack_1grow (&output_obstack, '\n');
 195     }
 196 }
 197
 198 static void
 199 print_state (int state)
 200 {
 201   obstack_sgrow (&output_obstack, "\n\n");
 202   obstack_fgrow1 (&output_obstack, _("state %d"), state);
 203   obstack_sgrow (&output_obstack, "\n\n");
 204   print_core (state);
 205   print_actions (state);
 206 }
 207 \f
 208 /*-----------------------------------------.
 209 | Print information on the whole grammar.  |
 210 `-----------------------------------------*/
 211
 212 #define END_TEST(End)                                           \
 213 do {                                                            \
 214   if (column + strlen(buffer) > (End))                          \
 215     {                                                           \
 216       obstack_fgrow1 (&output_obstack, "%s\n   ", buffer);      \
 217       column = 3;                                               \
 218       buffer[0] = 0;                                            \
 219     }                                                           \
 220 } while (0)
 221
 222
 223 static void
 224 print_grammar (void)
 225 {
 226   int i, j;
 227   short *rule;
 228   char buffer[90];
 229   int column = 0;
 230
 231   /* rule # : LHS -> RHS */
 232   obstack_1grow (&output_obstack, '\n');
 233   obstack_sgrow (&output_obstack, _("Grammar"));
 234   obstack_1grow (&output_obstack, '\n');
 235   for (i = 1; i <= nrules; i++)
 236     /* Don't print rules disabled in reduce_grammar_tables.  */
 237     if (rlhs[i] >= 0)
 238       {
 239         obstack_fgrow2 (&output_obstack,
 240                         _("rule %-4d %s ->"), i, tags[rlhs[i]]);
 241         rule = &ritem[rrhs[i]];
 242         if (*rule > 0)
 243           while (*rule > 0)
 244             obstack_fgrow1 (&output_obstack, " %s", tags[*rule++]);
 245         else
 246           obstack_sgrow (&output_obstack, _("           /* empty */"));
 247         obstack_1grow (&output_obstack, '\n');
 248       }
 249
 250   /* TERMINAL (type #) : rule #s terminal is on RHS */
 251   obstack_sgrow (&output_obstack, "\n");
 252   obstack_sgrow (&output_obstack,
 253                  _("Terminals, with rules where they appear"));
 254   obstack_sgrow (&output_obstack, "\n\n");
 255   obstack_fgrow1 (&output_obstack, "%s (-1)\n", tags[0]);
 256
 257   for (i = 0; i <= max_user_token_number; i++)
 258     if (token_translations[i] != 2)
 259       {
 260         buffer[0] = 0;
 261         column = strlen (tags[token_translations[i]]);
 262         obstack_sgrow (&output_obstack, tags[token_translations[i]]);
 263         END_TEST (50);
 264         sprintf (buffer, " (%d)", i);
 265
 266         for (j = 1; j <= nrules; j++)
 267           for (rule = &ritem[rrhs[j]]; *rule > 0; rule++)
 268             if (*rule == token_translations[i])
 269               {
 270                 END_TEST (65);
 271                 sprintf (buffer + strlen (buffer), " %d", j);
 272                 break;
 273               }
 274         obstack_fgrow1 (&output_obstack, "%s\n", buffer);
 275       }
 276
 277   obstack_sgrow (&output_obstack, "\n");
 278   obstack_sgrow (&output_obstack,
 279                  _("Nonterminals, with rules where they appear"));
 280   obstack_sgrow (&output_obstack, "\n\n");
 281   for (i = ntokens; i <= nsyms - 1; i++)
 282     {
 283       int left_count = 0, right_count = 0;
 284
 285       for (j = 1; j <= nrules; j++)
 286         {
 287           if (rlhs[j] == i)
 288             left_count++;
 289           for (rule = &ritem[rrhs[j]]; *rule > 0; rule++)
 290             if (*rule == i)
 291               {
 292                 right_count++;
 293                 break;
 294               }
 295         }
 296
 297       buffer[0] = 0;
 298       obstack_sgrow (&output_obstack, tags[i]);
 299       column = strlen (tags[i]);
 300       sprintf (buffer, " (%d)", i);
 301       END_TEST (0);
 302
 303       if (left_count > 0)
 304         {
 305           END_TEST (50);
 306           sprintf (buffer + strlen (buffer), _(" on left:"));
 307
 308           for (j = 1; j <= nrules; j++)
 309             {
 310               END_TEST (65);
 311               if (rlhs[j] == i)
 312                 sprintf (buffer + strlen (buffer), " %d", j);
 313             }
 314         }
 315
 316       if (right_count > 0)
 317         {
 318           if (left_count > 0)
 319             sprintf (buffer + strlen (buffer), ",");
 320           END_TEST (50);
 321           sprintf (buffer + strlen (buffer), _(" on right:"));
 322           for (j = 1; j <= nrules; j++)
 323             {
 324               for (rule = &ritem[rrhs[j]]; *rule > 0; rule++)
 325                 if (*rule == i)
 326                   {
 327                     END_TEST (65);
 328                     sprintf (buffer + strlen (buffer), " %d", j);
 329                     break;
 330                   }
 331             }
 332         }
 333       obstack_fgrow1 (&output_obstack, "%s\n", buffer);
 334     }
 335 }
 336 \f
 337 void
 338 print_results (void)
 339 {
 340   int i;
 341
 342   if (any_conflicts)
 343     print_conflicts ();
 344
 345   if (verbose_flag)
 346     print_grammar ();
 347
 348   if (verbose_flag)
 349     for (i = 0; i < nstates; i++)
 350       print_state (i);
 351 }