1 /* Grammar reduction for Bison.
3 Copyright (C) 2000-2002, 2007, 2009-2015, 2018-2022 Free Software
6 This file is part of Bison, the GNU Compiler Compiler.
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.
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.
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/>. */
24 void reduce_grammar (void);
25 void reduce_output (FILE *out
);
26 bool reduce_token_unused_in_grammar (symbol_number i
);
28 /** Whether symbol \a i is useless in the grammar.
29 * \pre reduce_grammar was called before.
31 bool reduce_nonterminal_useless_in_grammar (const sym_content
*sym
);
33 void reduce_free (void);
35 /** Map initial nterm numbers to the new ones. Built by
36 * reduce_grammar. Size nnterms + nuseless_nonterminals. */
37 extern symbol_number
*nterm_map
;
39 extern int nuseless_nonterminals
;
40 extern int nuseless_productions
;
42 #endif /* !REDUCE_H_ */