1 /* Part of the bison parser generator,
2 
3    Copyright (C) 2000, 2002, 2009-2012 Free Software Foundation, Inc.
4 
5    This file is part of Bison, the GNU Compiler Compiler.
6 
7    This program is free software: you can redistribute it and/or modify
8    it under the terms of the GNU General Public License as published by
9    the Free Software Foundation, either version 3 of the License, or
10    (at your option) any later version.
11 
12    This program is distributed in the hope that it will be useful,
13    but WITHOUT ANY WARRANTY; without even the implied warranty of
14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15    GNU General Public License for more details.
16 
17    You should have received a copy of the GNU General Public License
18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
19 
20 #ifndef NULLABLE_H_
21 # define NULLABLE_H_
22 
23 /* A vector saying which nonterminals can expand into the null string.
24    NULLABLE[I - NTOKENS] is nonzero if symbol I can do so.  */
25 extern bool *nullable;
26 
27 /* Set up NULLABLE. */
28 extern void nullable_compute (void);
29 
30 /* Free NULLABLE. */
31 extern void nullable_free (void);
32 #endif /* !NULLABLE_H_ */
33