src/nullable.h

   1 /* Part of the bison parser generator,
   2
   3    Copyright (C) 2000, 2002, 2009-2015, 2018-2021 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 <https://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_ */