src/lalr.h

/* Compute lookahead criteria for bison,

   Copyright (C) 1984, 1986, 1989, 2000, 2002, 2004, 2006 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"


/** Build the LALR(1) automaton.

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

   Builds:
   - #goto_map
   - #from_state
   - #to_state
*/
void lalr (void);


/** Release the information related to lookahead tokens.

   Can be performed once the action tables are computed.  */
void lalr_free (void);


typedef size_t goto_number;
# define GOTO_NUMBER_MAXIMUM ((goto_number) -1)

/** Index into #from_state and #to_state.

   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.  */
extern goto_number *goto_map;

/** State number which a transition leads from. */
extern state_number *from_state;

/** State number it leads to.  */
extern state_number *to_state;


#endif /* !LALR_H_ */
Commit	Line	Data
	1	/* Compute lookahead criteria for bison,
	2
	3	Copyright (C) 1984, 1986, 1989, 2000, 2002, 2004, 2006 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
	36	/** Build the LALR(1) automaton.
	37
	38	Compute how to make the finite state machine deterministic; find
	39	which rules need lookahead in each state, and which lookahead
	40	tokens they accept.
	41
	42	Builds:
	43	- #goto_map
	44	- #from_state
	45	- #to_state
	46	*/
	47	void lalr (void);
	48
	49
	50	/** Release the information related to lookahead tokens.
	51
	52	Can be performed once the action tables are computed. */
	53	void lalr_free (void);
	54
	55
	56	typedef size_t goto_number;
	57	# define GOTO_NUMBER_MAXIMUM ((goto_number) -1)
	58
	59	/** Index into #from_state and #to_state.
	60
	61	All the transitions that accept a particular variable are grouped
	62	together and GOTO_MAP[I - NTOKENS] is the index in FROM_STATE and
	63	TO_STATE of the first of them. */
	64	extern goto_number *goto_map;
	65
	66	/** State number which a transition leads from. */
	67	extern state_number *from_state;
	68
	69	/** State number it leads to. */
	70	extern state_number *to_state;
	71
	72
	73	#endif /* !LALR_H_ */