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