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1 /* Top level entry point of bison,
2 Copyright 1984, 1986, 1989, 1992, 1995, 2000
3 Free Software Foundation, Inc.
4
5 This file is part of Bison, the GNU Compiler Compiler.
6
7 Bison is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
10 any later version.
11
12 Bison is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with Bison; see the file COPYING. If not, write to
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
21
22
23 #include "system.h"
24 #include "getargs.h"
25 #include "files.h"
26 #include "complain.h"
27 #include "derives.h"
28 #include "output.h"
29 #include "reader.h"
30 #include "lalr.h"
31 #include "reduce.h"
32 #include "nullable.h"
33 #include "print.h"
34 #include "LR0.h"
35 #include "conflicts.h"
36 #include "print_graph.h"
37
38 /* The name this program was run with, for messages. */
39 char *program_name;
40
41 extern void berror PARAMS((const char *));
42
43 int
44 main (int argc, char *argv[])
45 {
46 program_name = argv[0];
47 setlocale (LC_ALL, "");
48 bindtextdomain (PACKAGE, LOCALEDIR);
49 textdomain (PACKAGE);
50
51 lineno = 0;
52 getargs (argc, argv);
53
54 macro_init ();
55 open_files ();
56
57 /* Read the input. Copy some parts of it to FGUARD, FACTION, FTABLE
58 and FATTRS. In file reader.c. The other parts are recorded in
59 the grammar; see gram.h. */
60 reader ();
61 if (complain_message_count)
62 exit (1);
63
64 /* find useless nonterminals and productions and reduce the grammar. In
65 file reduce.c */
66 reduce_grammar ();
67
68 /* record other info about the grammar. In files derives and nullable. */
69 set_derives ();
70 set_nullable ();
71
72 /* convert to nondeterministic finite state machine. In file LR0.
73 See state.h for more info. */
74 generate_states ();
75
76 /* make it deterministic. In file lalr. */
77 lalr ();
78
79 /* Find and record any conflicts: places where one token of
80 lookahead is not enough to disambiguate the parsing. In file
81 conflicts. Also resolve s/r conflicts based on precedence
82 declarations. */
83 initialize_conflicts ();
84
85 /* Print information about results, if requested. */
86 print_results ();
87
88 /* Output the VCG graph. */
89 print_graph ();
90
91 /* Output the tables and the parser to ftable. In file output. */
92 output ();
93
94 finalize_conflicts ();
95 free_nullable ();
96 free_derives ();
97
98 if (!complain_message_count)
99 output_files ();
100
101 exit (complain_message_count ? 1 : 0);
102 }
103 \f
104 /* Abort for an internal error denoted by string S. */
105
106 void
107 berror (const char *s)
108 {
109 fprintf (stderr, _("%s: internal error: %s\n"), program_name, s);
110 abort ();
111 }