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_ */