src/reduce.h

   1 /* Grammar reduction for Bison.
   2
   3    Copyright (C) 2000-2002, 2007, 2009-2015, 2018-2021 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 <https://www.gnu.org/licenses/>.  */
  20
  21 #ifndef REDUCE_H_
  22 # define REDUCE_H_
  23
  24 void reduce_grammar (void);
  25 void reduce_output (FILE *out);
  26 bool reduce_token_unused_in_grammar (symbol_number i);
  27
  28 /** Whether symbol \a i is useless in the grammar.
  29  * \pre  reduce_grammar was called before.
  30  */
  31 bool reduce_nonterminal_useless_in_grammar (const sym_content *sym);
  32
  33 void reduce_free (void);
  34
  35 /** Map initial nterm numbers to the new ones.  Built by
  36  * reduce_grammar.  Size nnterms + nuseless_nonterminals.  */
  37 extern symbol_number *nterm_map;
  38
  39 extern int nuseless_nonterminals;
  40 extern int nuseless_productions;
  41
  42 #endif /* !REDUCE_H_ */