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57 lines
1.9 KiB
C
57 lines
1.9 KiB
C
/* Subroutines for bison
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Copyright 1984, 1989, 2000 Free Software Foundation, Inc.
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This file is part of Bison, the GNU Compiler Compiler.
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Bison is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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Bison is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bison; see the file COPYING. If not, write to the Free
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Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#ifndef CLOSURE_H_
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# define CLOSURE_H_
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/* Subroutines of file LR0.c. */
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/* Allocates the itemset and ruleset vectors, and precomputes useful
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data so that closure can be called. n is the number of elements to
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allocate for itemset. */
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void new_closure PARAMS ((int n));
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/* Given a vector of item numbers ITEMS, of length N, set up ruleset
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and itemset to indicate what rules could be run and which items
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could be accepted when those items are the active ones.
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ruleset contains a bit for each rule. closure sets the bits for
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all rules which could potentially describe the next input to be
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read.
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itemset is a vector of item numbers; itemsetend points to just
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beyond the end of the part of it that is significant. closure
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places there the indices of all items which represent units of
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input that could arrive next. */
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void closure PARAMS ((short *items, int n));
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/* Frees itemset, ruleset and internal data. */
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void free_closure PARAMS ((void));
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extern short *itemset;
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extern short *itemsetend;
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#endif /* !CLOSURE_H_ */
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