1 | /* Part of the bison parser generator, |
2 | |
3 | Copyright (C) 2000, 2002, 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 NULLABLE_H_ |
22 | # define NULLABLE_H_ |
23 | |
24 | /* A vector saying which nonterminals can expand into the null string. |
25 | NULLABLE[I - NTOKENS] is nonzero if symbol I can do so. */ |
26 | extern bool *nullable; |
27 | |
28 | /* Set up NULLABLE. */ |
29 | extern void nullable_compute (void); |
30 | |
31 | /* Free NULLABLE. */ |
32 | extern void nullable_free (void); |
33 | #endif /* !NULLABLE_H_ */ |
34 | |