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. */
26extern bool *nullable;
27
28/* Set up NULLABLE. */
29extern void nullable_compute (void);
30
31/* Free NULLABLE. */
32extern void nullable_free (void);
33#endif /* !NULLABLE_H_ */
34