src/lalr.h

/* Compute look-ahead criteria for bison,
   Copyright (C) 1984, 1986, 1989, 2000, 2002 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 LALR_H_
# define LALR_H_

# include <bitset.h>
# include <bitsetv.h>

/* Import the definition of RULE_T. */
# include "gram.h"

/* Import the definition of CORE, TRANSITIONS and REDUCTIONS. */
# include "state.h"

/* Compute how to make the finite state machine deterministic; find
   which rules need lookahead in each state, and which lookahead
   tokens they accept.  */

void lalr (void);

/* Release the information related to lookaheads.  Can be performed
   once the action tables are computed.  */

void lalr_free (void);


/* lalr() builds these data structures. */

/* GOTO_MAP, FROM_STATE and TO_STATE -- record each shift transition
   which accepts a variable (a nonterminal).

   FROM_STATE[T] -- state number which a transition leads from.
   TO_STATE[T] -- state number it leads to.

   All the transitions that accept a particular variable are grouped
   together and GOTO_MAP[I - NTOKENS] is the index in FROM_STATE and
   TO_STATE of the first of them.  */

typedef short goto_number;
# define GOTO_NUMBER_MAXIMUM SHRT_MAX

extern goto_number *goto_map;
extern state_number *from_state;
extern state_number *to_state;


#endif /* !LALR_H_ */
Commit	Line	Data
	1	/* Compute look-ahead criteria for bison,
	2	Copyright (C) 1984, 1986, 1989, 2000, 2002 Free Software Foundation, Inc.
	3
	4	This file is part of Bison, the GNU Compiler Compiler.
	5
	6	Bison is free software; you can redistribute it and/or modify
	7	it under the terms of the GNU General Public License as published by
	8	the Free Software Foundation; either version 2, or (at your option)
	9	any later version.
	10
	11	Bison is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	GNU General Public License for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with Bison; see the file COPYING. If not, write to
	18	the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	19	Boston, MA 02111-1307, USA. */
	20
	21	#ifndef LALR_H_
	22	# define LALR_H_
	23
	24	# include <bitset.h>
	25	# include <bitsetv.h>
	26
	27	/* Import the definition of RULE_T. */
	28	# include "gram.h"
	29
	30	/* Import the definition of CORE, TRANSITIONS and REDUCTIONS. */
	31	# include "state.h"
	32
	33	/* Compute how to make the finite state machine deterministic; find
	34	which rules need lookahead in each state, and which lookahead
	35	tokens they accept. */
	36
	37	void lalr (void);
	38
	39	/* Release the information related to lookaheads. Can be performed
	40	once the action tables are computed. */
	41
	42	void lalr_free (void);
	43
	44
	45	/* lalr() builds these data structures. */
	46
	47	/* GOTO_MAP, FROM_STATE and TO_STATE -- record each shift transition
	48	which accepts a variable (a nonterminal).
	49
	50	FROM_STATE[T] -- state number which a transition leads from.
	51	TO_STATE[T] -- state number it leads to.
	52
	53	All the transitions that accept a particular variable are grouped
	54	together and GOTO_MAP[I - NTOKENS] is the index in FROM_STATE and
	55	TO_STATE of the first of them. */
	56
	57	typedef short goto_number;
	58	# define GOTO_NUMBER_MAXIMUM SHRT_MAX
	59
	60	extern goto_number *goto_map;
	61	extern state_number *from_state;
	62	extern state_number *to_state;
	63
	64
	65	#endif /* !LALR_H_ */