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68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
/* Compute look-ahead criteria for bison,
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Copyright (C) 1984, 1986, 1989, 2000, 2002, 2004 Free Software
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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
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it 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,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU 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
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#ifndef LALR_H_
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# define LALR_H_
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# include <bitset.h>
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# include <bitsetv.h>
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/* Import the definition of RULE_T. */
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# include "gram.h"
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/* Import the definition of CORE, TRANSITIONS and REDUCTIONS. */
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# include "state.h"
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/* Compute how to make the finite state machine deterministic; find
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which rules need look-ahead in each state, and which look-ahead
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tokens they accept. */
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void lalr (void);
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/* Release the information related to look-ahead tokens. Can be performed
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once the action tables are computed. */
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void lalr_free (void);
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/* lalr() builds these data structures. */
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/* GOTO_MAP, FROM_STATE and TO_STATE -- record each shift transition
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which accepts a variable (a nonterminal).
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FROM_STATE[T] -- state number which a transition leads from.
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TO_STATE[T] -- state number it leads to.
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All the transitions that accept a particular variable are grouped
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together and GOTO_MAP[I - NTOKENS] is the index in FROM_STATE and
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TO_STATE of the first of them. */
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typedef size_t goto_number;
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# define GOTO_NUMBER_MAXIMUM ((goto_number) -1)
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extern goto_number *goto_map;
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extern state_number *from_state;
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extern state_number *to_state;
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#endif /* !LALR_H_ */
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