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/* Subroutines for bison
Copyright (C) 1984, 1989, 2000 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., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#ifndef CLOSURE_H_
# define CLOSURE_H_
/* Subroutines of file LR0.c. */
/* Allocates the itemset and ruleset vectors, and precomputes useful
data so that closure can be called. n is the number of elements to
allocate for itemset. */
void new_closure PARAMS ((int n));
/* Given a vector of item numbers ITEMS, of length N, set up ruleset
and itemset to indicate what rules could be run and which items
could be accepted when those items are the active ones.
ruleset contains a bit for each rule. closure sets the bits for
all rules which could potentially describe the next input to be
read.
itemset is a vector of item numbers; itemsetend points to just
beyond the end of the part of it that is significant. closure
places there the indices of all items which represent units of
input that could arrive next. */
void closure PARAMS ((short *items, int n));
/* Frees itemset, ruleset and internal data. */
void free_closure PARAMS ((void));
extern short *itemset;
extern short *itemsetend;
#endif /* !CLOSURE_H_ */
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