src/gram.c

   1 /* Allocate input grammar variables for Bison.
   2
   3    Copyright (C) 1984, 1986, 1989, 2001-2003, 2005-2013 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 const *r)
  51 {
  52   return r->number < nrules;
  53 }
  54
  55 bool
  56 rule_useless_in_grammar_p (rule const *r)
  57 {
  58   return !rule_useful_in_grammar_p (r);
  59 }
  60
  61 bool
  62 rule_useless_in_parser_p (rule const *r)
  63 {
  64   return !r->useful && rule_useful_in_grammar_p (r);
  65 }
  66
  67 void
  68 rule_lhs_print (rule const *r, symbol const *previous_lhs, FILE *out)
  69 {
  70   fprintf (out, "  %3d ", r->number);
  71   if (previous_lhs != r->lhs)
  72     fprintf (out, "%s:", r->lhs->tag);
  73   else
  74     fprintf (out, "%*s|", (int) strlen (previous_lhs->tag), "");
  75 }
  76
  77 void
  78 rule_lhs_print_xml (rule const *r, FILE *out, int level)
  79 {
  80   xml_printf (out, level, "<lhs>%s</lhs>", r->lhs->tag);
  81 }
  82
  83 size_t
  84 rule_rhs_length (rule const *r)
  85 {
  86   size_t res = 0;
  87   item_number *rhsp;
  88   for (rhsp = r->rhs; *rhsp >= 0; ++rhsp)
  89     ++res;
  90   return res;
  91 }
  92
  93 void
  94 rule_rhs_print (rule const *r, FILE *out)
  95 {
  96   if (*r->rhs >= 0)
  97     {
  98       item_number *rp;
  99       for (rp = r->rhs; *rp >= 0; rp++)
 100         fprintf (out, " %s", symbols[*rp]->tag);
 101     }
 102   else
 103     {
 104       fprintf (out, " /* %s */", _("empty"));
 105     }
 106 }
 107
 108 static void
 109 rule_rhs_print_xml (rule const *r, FILE *out, int level)
 110 {
 111   if (*r->rhs >= 0)
 112     {
 113       item_number *rp;
 114       xml_puts (out, level, "<rhs>");
 115       for (rp = r->rhs; *rp >= 0; rp++)
 116         xml_printf (out, level + 1, "<symbol>%s</symbol>",
 117                     xml_escape (symbols[*rp]->tag));
 118       xml_puts (out, level, "</rhs>");
 119     }
 120   else
 121     {
 122       xml_puts (out, level, "<rhs>");
 123       xml_puts (out, level + 1, "<empty/>");
 124       xml_puts (out, level, "</rhs>");
 125     }
 126 }
 127
 128 static void
 129 rule_print (rule const *r, FILE *out)
 130 {
 131   fprintf (out, "%s:", r->lhs->tag);
 132   rule_rhs_print (r, out);
 133 }
 134
 135 void
 136 ritem_print (FILE *out)
 137 {
 138   unsigned int i;
 139   fputs ("RITEM\n", out);
 140   for (i = 0; i < nritems; ++i)
 141     if (ritem[i] >= 0)
 142       fprintf (out, "  %s", symbols[ritem[i]]->tag);
 143     else
 144       fprintf (out, "  (rule %d)\n", item_number_as_rule_number (ritem[i]));
 145   fputs ("\n\n", out);
 146 }
 147
 148 size_t
 149 ritem_longest_rhs (void)
 150 {
 151   int max = 0;
 152   rule_number r;
 153
 154   for (r = 0; r < nrules; ++r)
 155     {
 156       int length = rule_rhs_length (&rules[r]);
 157       if (length > max)
 158         max = length;
 159     }
 160
 161   return max;
 162 }
 163
 164 void
 165 grammar_rules_partial_print (FILE *out, const char *title,
 166                              rule_filter filter)
 167 {
 168   rule_number r;
 169   bool first = true;
 170   symbol *previous_lhs = NULL;
 171
 172   /* rule # : LHS -> RHS */
 173   for (r = 0; r < nrules + nuseless_productions; r++)
 174     {
 175       if (filter && !filter (&rules[r]))
 176         continue;
 177       if (first)
 178         fprintf (out, "%s\n\n", title);
 179       else if (previous_lhs && previous_lhs != rules[r].lhs)
 180         fputc ('\n', out);
 181       first = false;
 182       rule_lhs_print (&rules[r], previous_lhs, out);
 183       rule_rhs_print (&rules[r], out);
 184       fprintf (out, "\n");
 185       previous_lhs = rules[r].lhs;
 186     }
 187   if (!first)
 188     fputs ("\n\n", out);
 189 }
 190
 191 void
 192 grammar_rules_print (FILE *out)
 193 {
 194   grammar_rules_partial_print (out, _("Grammar"), rule_useful_in_grammar_p);
 195 }
 196
 197 void
 198 grammar_rules_print_xml (FILE *out, int level)
 199 {
 200   rule_number r;
 201   bool first = true;
 202
 203   for (r = 0; r < nrules + nuseless_productions; r++)
 204     {
 205       if (first)
 206         xml_puts (out, level + 1, "<rules>");
 207       first = false;
 208       {
 209         char const *usefulness;
 210         if (rule_useless_in_grammar_p (&rules[r]))
 211           usefulness = "useless-in-grammar";
 212         else if (rule_useless_in_parser_p (&rules[r]))
 213           usefulness = "useless-in-parser";
 214         else
 215           usefulness = "useful";
 216         xml_indent (out, level + 2);
 217         fprintf (out, "<rule number=\"%d\" usefulness=\"%s\"",
 218                  rules[r].number, usefulness);
 219         if (rules[r].precsym)
 220           fprintf (out, " percent_prec=\"%s\"",
 221                    xml_escape (rules[r].precsym->tag));
 222         fputs (">\n", out);
 223       }
 224       rule_lhs_print_xml (&rules[r], out, level + 3);
 225       rule_rhs_print_xml (&rules[r], out, level + 3);
 226       xml_puts (out, level + 2, "</rule>");
 227     }
 228   if (!first)
 229     xml_puts (out, level + 1, "</rules>");
 230   else
 231    xml_puts (out, level + 1, "<rules/>");
 232 }
 233
 234 void
 235 grammar_dump (FILE *out, const char *title)
 236 {
 237   fprintf (out, "%s\n\n", title);
 238   fprintf (out,
 239            "ntokens = %d, nvars = %d, nsyms = %d, nrules = %d, nritems = %d\n\n",
 240            ntokens, nvars, nsyms, nrules, nritems);
 241
 242
 243   fprintf (out, "Variables\n---------\n\n");
 244   {
 245     symbol_number i;
 246     fprintf (out, "Value  Sprec  Sassoc  Tag\n");
 247
 248     for (i = ntokens; i < nsyms; i++)
 249       fprintf (out, "%5d  %5d   %5d  %s\n",
 250                i,
 251                symbols[i]->prec, symbols[i]->assoc,
 252                symbols[i]->tag);
 253     fprintf (out, "\n\n");
 254   }
 255
 256   fprintf (out, "Rules\n-----\n\n");
 257   {
 258     rule_number i;
 259     fprintf (out,
 260              "Num (Prec, Assoc, Useful, Ritem Range) Lhs"
 261              " -> Rhs (Ritem range) [Num]\n");
 262     for (i = 0; i < nrules + nuseless_productions; i++)
 263       {
 264         rule const *rule_i = &rules[i];
 265         item_number *rp = NULL;
 266         unsigned int rhs_itemno = rule_i->rhs - ritem;
 267         unsigned int rhs_count = 0;
 268         /* Find the last RHS index in ritems. */
 269         for (rp = rule_i->rhs; *rp >= 0; ++rp)
 270           ++rhs_count;
 271         fprintf (out, "%3d (%2d, %2d, %2d, %2u-%2u)   %2d ->",
 272                  i,
 273                  rule_i->prec ? rule_i->prec->prec : 0,
 274                  rule_i->prec ? rule_i->prec->assoc : 0,
 275                  rule_i->useful,
 276                  rhs_itemno,
 277                  rhs_itemno + rhs_count - 1,
 278                  rule_i->lhs->number);
 279         /* Dumped the RHS. */
 280         for (rp = rule_i->rhs; *rp >= 0; rp++)
 281           fprintf (out, " %3d", *rp);
 282         fprintf (out, "  [%d]\n", item_number_as_rule_number (*rp));
 283       }
 284   }
 285   fprintf (out, "\n\n");
 286
 287   fprintf (out, "Rules interpreted\n-----------------\n\n");
 288   {
 289     rule_number r;
 290     for (r = 0; r < nrules + nuseless_productions; r++)
 291       {
 292         fprintf (out, "%-5d  ", r);
 293         rule_print (&rules[r], out);
 294         fprintf (out, "\n");
 295       }
 296   }
 297   fprintf (out, "\n\n");
 298 }
 299
 300 void
 301 grammar_rules_useless_report (const char *message)
 302 {
 303   warnings w = Wother;
 304   if (warnings_flag & w)
 305     {
 306       rule_number r;
 307       for (r = 0; r < nrules ; ++r)
 308         if (!rules[r].useful)
 309           {
 310             if (feature_flag & feature_caret)
 311               complain (&rules[r].location, w, "%s", message);
 312             else
 313               {
 314                 complain (&rules[r].location, w | silent, "%s: ", message);
 315                 rule_print (&rules[r], stderr);
 316                 warnings_print_categories (w);
 317                 fprintf (stderr, "\n");
 318               }
 319           }
 320     }
 321 }
 322
 323 void
 324 grammar_free (void)
 325 {
 326   if (ritem)
 327     free (ritem - 1);
 328   free (rules);
 329   free (token_translations);
 330   /* Free the symbol table data structure.  */
 331   symbols_free ();
 332   free_merger_functions ();
 333 }