1 /* Top level entry point of Bison.
3 Copyright (C) 1984, 1986, 1989, 1992, 1995, 2000, 2001, 2002, 2004,
4 2005, 2006 Free Software Foundation, Inc.
6 This file is part of Bison, the GNU Compiler Compiler.
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)
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.
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. */
26 #include <bitset_stats.h>
28 #include <configmake.h>
34 #include "conflicts.h"
40 #include "muscle_tab.h"
44 #include "print_graph.h"
47 #include "scan-code.h"
48 #include "scan-gram.h"
53 /* The name this program was run with, for messages. */
59 main (int argc
, char *argv
[])
61 program_name
= argv
[0];
62 setlocale (LC_ALL
, "");
63 (void) bindtextdomain (PACKAGE
, LOCALEDIR
);
64 (void) bindtextdomain ("bison-runtime", LOCALEDIR
);
65 (void) textdomain (PACKAGE
);
71 timevar_report
= trace_flag
& trace_time
;
73 timevar_start (TV_TOTAL
);
75 if (trace_flag
& trace_bitsets
)
76 bitset_stats_enable ();
80 /* Read the input. Copy some parts of it to FGUARD, FACTION, FTABLE
81 and FATTRS. In file reader.c. The other parts are recorded in
82 the grammar; see gram.h. */
84 timevar_push (TV_READER
);
86 timevar_pop (TV_READER
);
91 /* Find useless nonterminals and productions and reduce the grammar. */
92 timevar_push (TV_REDUCE
);
94 timevar_pop (TV_REDUCE
);
96 /* Record other info about the grammar. In files derives and
98 timevar_push (TV_SETS
);
101 timevar_pop (TV_SETS
);
103 /* Convert to nondeterministic finite state machine. In file LR0.
104 See state.h for more info. */
105 timevar_push (TV_LR0
);
107 timevar_pop (TV_LR0
);
109 /* make it deterministic. In file lalr. */
110 timevar_push (TV_LALR
);
112 timevar_pop (TV_LALR
);
114 /* Find and record any conflicts: places where one token of
115 lookahead is not enough to disambiguate the parsing. In file
116 conflicts. Also resolve s/r conflicts based on precedence
118 timevar_push (TV_CONFLICTS
);
121 timevar_pop (TV_CONFLICTS
);
123 /* Compute the parser tables. */
124 timevar_push (TV_ACTIONS
);
126 timevar_pop (TV_ACTIONS
);
128 grammar_rules_never_reduced_report
129 (_("rule never reduced because of conflicts"));
131 /* Output file names. */
132 compute_output_file_names ();
134 /* Output the detailed report on the grammar. */
137 timevar_push (TV_REPORT
);
139 timevar_pop (TV_REPORT
);
142 /* Output the graph. */
145 timevar_push (TV_GRAPH
);
147 timevar_pop (TV_GRAPH
);
150 /* Stop if there were errors, to avoid trashing previous output
152 if (complaint_issued
)
155 /* Lookahead tokens are no longer needed. */
156 timevar_push (TV_FREE
);
158 timevar_pop (TV_FREE
);
160 /* Output the tables and the parser to ftable. In file output. */
161 timevar_push (TV_PARSER
);
163 timevar_pop (TV_PARSER
);
165 timevar_push (TV_FREE
);
173 output_file_names_free ();
175 /* The scanner memory cannot be released right after parsing, as it
176 contains things such as user actions, prologue, epilogue etc. */
177 gram_scanner_free ();
180 code_scanner_free ();
182 timevar_pop (TV_FREE
);
184 if (trace_flag
& trace_bitsets
)
185 bitset_stats_dump (stderr
);
189 /* Stop timing and print the times. */
190 timevar_stop (TV_TOTAL
);
191 timevar_print (stderr
);
193 return complaint_issued
? EXIT_FAILURE
: EXIT_SUCCESS
;