1/* Grammar reduction for Bison.
2
3 Copyright (C) 2000-2002, 2007, 2009-2015, 2018-2019 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#ifndef REDUCE_H_
22# define REDUCE_H_
23
24void reduce_grammar (void);
25void reduce_output (FILE *out);
26bool 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 */
31bool reduce_nonterminal_useless_in_grammar (const sym_content *sym);
32
33void reduce_free (void);
34
35/** Map initial nterm numbers to the new ones. Built by
36 * reduce_grammar. Size nvars + nuseless_nonterminals. */
37extern symbol_number *nterm_map;
38
39extern unsigned nuseless_nonterminals;
40extern unsigned nuseless_productions;
41
42#endif /* !REDUCE_H_ */
43