If conflict resolution makes states unreachable, remove those states,

[bison.git] / src / conflicts.h

/* Find and resolve or report lookahead conflicts for bison,
   Copyright (C) 2000, 2001, 2002, 2004 Free Software Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.

   Bison is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   Bison is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with Bison; see the file COPYING.  If not, write to the Free
   Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.  */

#ifndef CONFLICTS_H_
# define CONFLICTS_H_
# include "state.h"

void conflicts_solve (void);

/**
 * Update state numbers recorded in internal arrays such that:
 *   - \c nstates_old is the old number of states.
 *   - Where \c i is the old state number, <tt>old_to_new[i]</tt> is either:
 *     - \c nstates_old if state \c i is removed because it is unreachable.
 *     - The new state number.
 *   - The highest new state number is the number of remaining states - 1.
 *   - The numerical order of the remaining states has not changed.
 */
void conflicts_update_state_numbers (state_number old_to_new[],
                                     state_number nstates_old);

void conflicts_print (void);
int conflicts_total_count (void);
void conflicts_output (FILE *out);
void conflicts_free (void);

/* Were there conflicts? */
extern int expected_sr_conflicts;
extern int expected_rr_conflicts;
#endif /* !CONFLICTS_H_ */