1 /* Top level entry point of Bison.
3 Copyright (C) 1984, 1986, 1989, 1992, 1995, 2000-2002, 2004-2012 Free
4 Software Foundation, Inc.
6 This file is part of Bison, the GNU Compiler Compiler.
8 This program 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 3 of the License, or
11 (at your option) any later version.
13 This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
24 #include <bitset_stats.h>
26 #include <configmake.h>
34 #include "conflicts.h"
41 #include "muscle-tab.h"
45 #include "print_graph.h"
46 #include "print-xml.h"
50 #include "scan-code.h"
51 #include "scan-gram.h"
52 #include "scan-skel.h"
59 main (int argc
, char *argv
[])
61 set_program_name (argv
[0]);
62 setlocale (LC_ALL
, "");
63 (void) bindtextdomain (PACKAGE
, LOCALEDIR
);
64 (void) bindtextdomain ("bison-runtime", LOCALEDIR
);
65 (void) textdomain (PACKAGE
);
68 char const *cp
= getenv ("LC_CTYPE");
69 if (cp
&& STREQ (cp
, "C"))
70 set_custom_quoting ("e_quoting_options
, "'", "'");
72 set_quoting_style ("e_quoting_options
, locale_quoting_style
);
75 atexit (close_stdout
);
82 timevar_report
= trace_flag
& trace_time
;
84 timevar_start (TV_TOTAL
);
86 if (trace_flag
& trace_bitsets
)
87 bitset_stats_enable ();
89 /* Read the input. Copy some parts of it to FGUARD, FACTION, FTABLE
90 and FATTRS. In file reader.c. The other parts are recorded in
91 the grammar; see gram.h. */
93 timevar_push (TV_READER
);
95 timevar_pop (TV_READER
);
100 /* Find useless nonterminals and productions and reduce the grammar. */
101 timevar_push (TV_REDUCE
);
103 timevar_pop (TV_REDUCE
);
105 /* Record other info about the grammar. In files derives and
107 timevar_push (TV_SETS
);
110 timevar_pop (TV_SETS
);
112 /* Compute LR(0) parser states. See state.h for more info. */
113 timevar_push (TV_LR0
);
115 timevar_pop (TV_LR0
);
117 /* Add lookahead sets to parser states. Except when LALR(1) is
118 requested, split states to eliminate LR(1)-relative
122 /* Find and record any conflicts: places where one token of
123 lookahead is not enough to disambiguate the parsing. In file
124 conflicts. Also resolve s/r conflicts based on precedence
126 timevar_push (TV_CONFLICTS
);
128 if (!muscle_percent_define_flag_if ("lr.keep-unreachable-states"))
130 state_number
*old_to_new
= xnmalloc (nstates
, sizeof *old_to_new
);
131 state_number nstates_old
= nstates
;
132 state_remove_unreachable_states (old_to_new
);
133 lalr_update_state_numbers (old_to_new
, nstates_old
);
134 conflicts_update_state_numbers (old_to_new
, nstates_old
);
138 timevar_pop (TV_CONFLICTS
);
140 /* Compute the parser tables. */
141 timevar_push (TV_ACTIONS
);
143 timevar_pop (TV_ACTIONS
);
145 grammar_rules_useless_report (_("rule useless in parser due to conflicts"));
147 /* Output file names. */
148 compute_output_file_names ();
150 /* Output the detailed report on the grammar. */
153 timevar_push (TV_REPORT
);
155 timevar_pop (TV_REPORT
);
158 /* Output the graph. */
161 timevar_push (TV_GRAPH
);
163 timevar_pop (TV_GRAPH
);
169 timevar_push (TV_XML
);
171 timevar_pop (TV_XML
);
174 /* Stop if there were errors, to avoid trashing previous output
176 if (complaint_issued
)
179 /* Lookahead tokens are no longer needed. */
180 timevar_push (TV_FREE
);
182 timevar_pop (TV_FREE
);
184 /* Output the tables and the parser to ftable. In file output. */
185 timevar_push (TV_PARSER
);
187 timevar_pop (TV_PARSER
);
189 timevar_push (TV_FREE
);
197 output_file_names_free ();
199 /* The scanner memory cannot be released right after parsing, as it
200 contains things such as user actions, prologue, epilogue etc. */
201 gram_scanner_free ();
204 code_scanner_free ();
205 skel_scanner_free ();
207 timevar_pop (TV_FREE
);
209 if (trace_flag
& trace_bitsets
)
210 bitset_stats_dump (stderr
);
214 /* Stop timing and print the times. */
215 timevar_stop (TV_TOTAL
);
216 timevar_print (stderr
);
218 return complaint_issued
? EXIT_FAILURE
: EXIT_SUCCESS
;