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 | |
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 nvars + nuseless_nonterminals. */ |
37 | extern symbol_number *nterm_map; |
38 | |
39 | extern unsigned nuseless_nonterminals; |
40 | extern unsigned nuseless_productions; |
41 | |
42 | #endif /* !REDUCE_H_ */ |
43 | |