src/print.c

   1 /* Print information on generated parser, for bison,
   2    Copyright 1984, 1986, 1989, 2000, 2001 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 "files.h"
  24 #include "gram.h"
  25 #include "LR0.h"
  26 #include "lalr.h"
  27 #include "conflicts.h"
  28 #include "getargs.h"
  29 #include "state.h"
  30 #include "reader.h"
  31 #include "print.h"
  32 #include "reduce.h"
  33 #include "closure.h"
  34
  35 #if 0
  36 static void
  37 print_token (int extnum, int token)
  38 {
  39   fprintf (out, _(" type %d is %s\n"), extnum, tags[token]);
  40 }
  41 #endif
  42
  43 \f
  44 /*--------------------------------.
  45 | Report information on a state.  |
  46 `--------------------------------*/
  47
  48 static void
  49 print_core (FILE *out, int state)
  50 {
  51   int i;
  52   short *sitems = state_table[state]->items;
  53   int snitems   = state_table[state]->nitems;
  54
  55   /* New experimental feature: if TRACE_FLAGS output all the items of
  56      a state, not only its kernel.  */
  57   if (trace_flag)
  58     {
  59       closure (sitems, snitems);
  60       sitems = itemset;
  61       snitems = nitemset;
  62     }
  63
  64   if (snitems)
  65     {
  66       for (i = 0; i < snitems; i++)
  67         {
  68           short *sp;
  69           short *sp1;
  70           int rule;
  71
  72           sp1 = sp = ritem + sitems[i];
  73
  74           while (*sp > 0)
  75             sp++;
  76
  77           rule = -(*sp);
  78           fprintf (out, "    %s  ->  ", tags[rule_table[rule].lhs]);
  79
  80           for (sp = ritem + rule_table[rule].rhs; sp < sp1; sp++)
  81             fprintf (out, "%s ", tags[*sp]);
  82
  83           fputc ('.', out);
  84
  85           for (/* Nothing */; *sp > 0; ++sp)
  86             fprintf (out, " %s", tags[*sp]);
  87
  88           fprintf (out, _("   (rule %d)"), rule);
  89           fputc ('\n', out);
  90         }
  91
  92       fputc ('\n', out);
  93     }
  94 }
  95
  96 static void
  97 print_actions (FILE *out, int state)
  98 {
  99   int i;
 100
 101   shifts   *shiftp = state_table[state]->shifts;
 102   reductions *redp = state_table[state]->reductions;
 103   errs       *errp = state_table[state]->errs;
 104
 105   if (!shiftp->nshifts && !redp)
 106     {
 107       if (final_state == state)
 108         fprintf (out, _("    $default\taccept\n"));
 109       else
 110         fprintf (out, _("    NO ACTIONS\n"));
 111       return;
 112     }
 113
 114   for (i = 0; i < shiftp->nshifts && SHIFT_IS_SHIFT (shiftp, i); i++)
 115     if (!SHIFT_IS_DISABLED (shiftp, i))
 116       {
 117         int state1 = shiftp->shifts[i];
 118         int symbol = state_table[state1]->accessing_symbol;
 119         fprintf (out,
 120                  _("    %-4s\tshift, and go to state %d\n"),
 121                  tags[symbol], state1);
 122       }
 123
 124   if (i > 0)
 125     fputc ('\n', out);
 126
 127   if (errp)
 128     {
 129       int j;
 130       for (j = 0; j < errp->nerrs; j++)
 131         {
 132           int symbol = errp->errs[j];
 133           if (!symbol)
 134             continue;
 135           fprintf (out, _("    %-4s\terror (nonassociative)\n"),
 136                    tags[symbol]);
 137         }
 138
 139       if (j > 0)
 140         fputc ('\n', out);
 141     }
 142
 143   if (state_table[state]->consistent && redp)
 144     {
 145       int rule = redp->rules[0];
 146       int symbol = rule_table[rule].lhs;
 147       fprintf (out, _("    $default\treduce using rule %d (%s)\n\n"),
 148                rule, tags[symbol]);
 149     }
 150   else if (redp)
 151     {
 152       print_reductions (out, state);
 153     }
 154
 155   if (i < shiftp->nshifts)
 156     {
 157       for (; i < shiftp->nshifts; i++)
 158         if (!SHIFT_IS_DISABLED (shiftp, i))
 159           {
 160             int state1 = shiftp->shifts[i];
 161             int symbol = state_table[state1]->accessing_symbol;
 162             fprintf (out, _("    %-4s\tgo to state %d\n"),
 163                      tags[symbol], state1);
 164           }
 165
 166       fputc ('\n', out);
 167     }
 168 }
 169
 170 static void
 171 print_state (FILE *out, int state)
 172 {
 173   fprintf (out, _("state %d"), state);
 174   fputs ("\n\n", out);
 175   print_core (out, state);
 176   print_actions (out, state);
 177   fputs ("\n\n", out);
 178 }
 179 \f
 180 /*-----------------------------------------.
 181 | Print information on the whole grammar.  |
 182 `-----------------------------------------*/
 183
 184 #define END_TEST(End)                           \
 185 do {                                            \
 186   if (column + strlen(buffer) > (End))          \
 187     {                                           \
 188       fprintf (out, "%s\n   ", buffer);         \
 189       column = 3;                               \
 190       buffer[0] = 0;                            \
 191     }                                           \
 192 } while (0)
 193
 194
 195 static void
 196 print_grammar (FILE *out)
 197 {
 198   int i, j;
 199   short *rule;
 200   char buffer[90];
 201   int column = 0;
 202
 203   /* rule # : LHS -> RHS */
 204   fprintf (out, "%s\n\n", _("Grammar"));
 205   fprintf (out, "  %s\n", _("Number, Line, Rule"));
 206   for (i = 1; i <= nrules; i++)
 207     /* Don't print rules disabled in reduce_grammar_tables.  */
 208     if (rule_table[i].useful)
 209       {
 210         fprintf (out, _("  %3d %3d %s ->"),
 211                  i, rule_table[i].line, tags[rule_table[i].lhs]);
 212         rule = &ritem[rule_table[i].rhs];
 213         if (*rule > 0)
 214           while (*rule > 0)
 215             fprintf (out, " %s", tags[*rule++]);
 216         else
 217           fprintf (out, " /* %s */", _("empty"));
 218         fputc ('\n', out);
 219       }
 220   fputs ("\n\n", out);
 221
 222
 223   /* TERMINAL (type #) : rule #s terminal is on RHS */
 224   fprintf (out, "%s\n\n", _("Terminals, with rules where they appear"));
 225   fprintf (out, "%s (-1)\n", tags[0]);
 226
 227   for (i = 0; i <= max_user_token_number; i++)
 228     if (token_translations[i] != 2)
 229       {
 230         buffer[0] = 0;
 231         column = strlen (tags[token_translations[i]]);
 232         fputs (tags[token_translations[i]], out);
 233         END_TEST (50);
 234         sprintf (buffer, " (%d)", i);
 235
 236         for (j = 1; j <= nrules; j++)
 237           for (rule = &ritem[rule_table[j].rhs]; *rule > 0; rule++)
 238             if (*rule == token_translations[i])
 239               {
 240                 END_TEST (65);
 241                 sprintf (buffer + strlen (buffer), " %d", j);
 242                 break;
 243               }
 244         fprintf (out, "%s\n", buffer);
 245       }
 246   fputs ("\n\n", out);
 247
 248
 249   fprintf (out, "%s\n\n", _("Nonterminals, with rules where they appear"));
 250   for (i = ntokens; i <= nsyms - 1; i++)
 251     {
 252       int left_count = 0, right_count = 0;
 253
 254       for (j = 1; j <= nrules; j++)
 255         {
 256           if (rule_table[j].lhs == i)
 257             left_count++;
 258           for (rule = &ritem[rule_table[j].rhs]; *rule > 0; rule++)
 259             if (*rule == i)
 260               {
 261                 right_count++;
 262                 break;
 263               }
 264         }
 265
 266       buffer[0] = 0;
 267       fputs (tags[i], out);
 268       column = strlen (tags[i]);
 269       sprintf (buffer, " (%d)", i);
 270       END_TEST (0);
 271
 272       if (left_count > 0)
 273         {
 274           END_TEST (50);
 275           sprintf (buffer + strlen (buffer), _(" on left:"));
 276
 277           for (j = 1; j <= nrules; j++)
 278             {
 279               END_TEST (65);
 280               if (rule_table[j].lhs == i)
 281                 sprintf (buffer + strlen (buffer), " %d", j);
 282             }
 283         }
 284
 285       if (right_count > 0)
 286         {
 287           if (left_count > 0)
 288             sprintf (buffer + strlen (buffer), ",");
 289           END_TEST (50);
 290           sprintf (buffer + strlen (buffer), _(" on right:"));
 291           for (j = 1; j <= nrules; j++)
 292             {
 293               for (rule = &ritem[rule_table[j].rhs]; *rule > 0; rule++)
 294                 if (*rule == i)
 295                   {
 296                     END_TEST (65);
 297                     sprintf (buffer + strlen (buffer), " %d", j);
 298                     break;
 299                   }
 300             }
 301         }
 302       fprintf (out, "%s\n", buffer);
 303     }
 304   fputs ("\n\n", out);
 305 }
 306 \f
 307 void
 308 print_results (void)
 309 {
 310   int i;
 311
 312   /* We used to use just .out if SPEC_NAME_PREFIX (-p) was used, but
 313      that conflicts with Posix.  */
 314   FILE *out = xfopen (spec_verbose_file, "w");
 315
 316   size_t size = obstack_object_size (&output_obstack);
 317   fwrite (obstack_finish (&output_obstack), 1, size, out);
 318   obstack_free (&output_obstack, NULL);
 319
 320   if (size)
 321     fputs ("\n\n", out);
 322
 323   reduce_output (out);
 324   conflicts_output (out);
 325
 326   print_grammar (out);
 327
 328   /* New experimental feature: output all the items of a state,
 329      not only its kernel.  Requires to run closure, which need
 330      memory allocation/deallocation.  */
 331   if (trace_flag)
 332     new_closure (nitems);
 333   for (i = 0; i < nstates; i++)
 334     print_state (out, i);
 335   if (trace_flag)
 336     free_closure ();
 337
 338   xfclose (out);
 339 }