nullable.h revision cea198a11f15a2eb071d98491ca9a8bc8cebfbc4 
1/* Part of the bison parser generator,
2   Copyright (C) 2000, 2002 Free Software Foundation, Inc.
3
4   This file is part of Bison, the GNU Compiler Compiler.
5
6   Bison is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 2, or (at your option)
9   any later version.
10
11   Bison is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with Bison; see the file COPYING.  If not, write to
18   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19   Boston, MA 02110-1301, USA.  */
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