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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_ */