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_ */