src/lalr.h

/* Compute look-ahead criteria for bison,

   Copyright (C) 1984, 1986, 1989, 2000, 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 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 look-ahead in each state, and which look-ahead
   tokens they accept.  */

void lalr (void);

/* Release the information related to look-ahead tokens.  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 size_t goto_number;
# define GOTO_NUMBER_MAXIMUM ((goto_number) -1)

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
	3	Copyright (C) 1984, 1986, 1989, 2000, 2002, 2004 Free Software
	4	Foundation, Inc.
	5
	6	This file is part of Bison, the GNU Compiler Compiler.
	7
	8	Bison is free software; you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2, or (at your option)
	11	any later version.
	12
	13	Bison is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with Bison; see the file COPYING. If not, write to
	20	the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
	21	Boston, MA 02110-1301, USA. */
	22
	23	#ifndef LALR_H_
	24	# define LALR_H_
	25
	26	# include <bitset.h>
	27	# include <bitsetv.h>
	28
	29	/* Import the definition of RULE_T. */
	30	# include "gram.h"
	31
	32	/* Import the definition of CORE, TRANSITIONS and REDUCTIONS. */
	33	# include "state.h"
	34
	35	/* Compute how to make the finite state machine deterministic; find
	36	which rules need look-ahead in each state, and which look-ahead
	37	tokens they accept. */
	38
	39	void lalr (void);
	40
	41	/* Release the information related to look-ahead tokens. Can be performed
	42	once the action tables are computed. */
	43
	44	void lalr_free (void);
	45
	46
	47	/* lalr() builds these data structures. */
	48
	49	/* GOTO_MAP, FROM_STATE and TO_STATE -- record each shift transition
	50	which accepts a variable (a nonterminal).
	51
	52	FROM_STATE[T] -- state number which a transition leads from.
	53	TO_STATE[T] -- state number it leads to.
	54
	55	All the transitions that accept a particular variable are grouped
	56	together and GOTO_MAP[I - NTOKENS] is the index in FROM_STATE and
	57	TO_STATE of the first of them. */
	58
	59	typedef size_t goto_number;
	60	# define GOTO_NUMBER_MAXIMUM ((goto_number) -1)
	61
	62	extern goto_number *goto_map;
	63	extern state_number *from_state;
	64	extern state_number *to_state;
	65
	66
	67	#endif /* !LALR_H_ */