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1 | /* Top level entry point of Bison. | |
2 | ||
3 | Copyright (C) 1984, 1986, 1989, 1992, 1995, 2000, 2001, 2002, 2004, | |
4 | 2005, 2006, 2007 Free Software 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 | #include <config.h> | |
24 | #include "system.h" | |
25 | ||
26 | #include <bitset_stats.h> | |
27 | #include <bitset.h> | |
28 | #include <configmake.h> | |
29 | #include <quotearg.h> | |
30 | #include <timevar.h> | |
31 | ||
32 | #include "LR0.h" | |
33 | #include "complain.h" | |
34 | #include "conflicts.h" | |
35 | #include "derives.h" | |
36 | #include "files.h" | |
37 | #include "getargs.h" | |
38 | #include "gram.h" | |
39 | #include "lalr.h" | |
40 | #include "muscle_tab.h" | |
41 | #include "nullable.h" | |
42 | #include "output.h" | |
43 | #include "print.h" | |
44 | #include "print_graph.h" | |
45 | #include "reader.h" | |
46 | #include "reduce.h" | |
47 | #include "scan-code.h" | |
48 | #include "scan-gram.h" | |
49 | #include "scan-skel.h" | |
50 | #include "symtab.h" | |
51 | #include "tables.h" | |
52 | #include "uniqstr.h" | |
53 | ||
54 | ||
55 | ||
56 | int | |
57 | main (int argc, char *argv[]) | |
58 | { | |
59 | program_name = argv[0]; | |
60 | setlocale (LC_ALL, ""); | |
61 | (void) bindtextdomain (PACKAGE, LOCALEDIR); | |
62 | (void) bindtextdomain ("bison-runtime", LOCALEDIR); | |
63 | (void) textdomain (PACKAGE); | |
64 | ||
65 | uniqstrs_new (); | |
66 | ||
67 | getargs (argc, argv); | |
68 | ||
69 | timevar_report = trace_flag & trace_time; | |
70 | init_timevar (); | |
71 | timevar_start (TV_TOTAL); | |
72 | ||
73 | if (trace_flag & trace_bitsets) | |
74 | bitset_stats_enable (); | |
75 | ||
76 | muscle_init (); | |
77 | ||
78 | /* Read the input. Copy some parts of it to FGUARD, FACTION, FTABLE | |
79 | and FATTRS. In file reader.c. The other parts are recorded in | |
80 | the grammar; see gram.h. */ | |
81 | ||
82 | timevar_push (TV_READER); | |
83 | reader (); | |
84 | timevar_pop (TV_READER); | |
85 | ||
86 | if (complaint_issued) | |
87 | goto finish; | |
88 | ||
89 | /* Find useless nonterminals and productions and reduce the grammar. */ | |
90 | timevar_push (TV_REDUCE); | |
91 | reduce_grammar (); | |
92 | timevar_pop (TV_REDUCE); | |
93 | ||
94 | /* Record other info about the grammar. In files derives and | |
95 | nullable. */ | |
96 | timevar_push (TV_SETS); | |
97 | derives_compute (); | |
98 | nullable_compute (); | |
99 | timevar_pop (TV_SETS); | |
100 | ||
101 | /* Convert to nondeterministic finite state machine. In file LR0. | |
102 | See state.h for more info. */ | |
103 | timevar_push (TV_LR0); | |
104 | generate_states (); | |
105 | timevar_pop (TV_LR0); | |
106 | ||
107 | /* make it deterministic. In file lalr. */ | |
108 | timevar_push (TV_LALR); | |
109 | lalr (); | |
110 | timevar_pop (TV_LALR); | |
111 | ||
112 | /* Find and record any conflicts: places where one token of | |
113 | lookahead is not enough to disambiguate the parsing. In file | |
114 | conflicts. Also resolve s/r conflicts based on precedence | |
115 | declarations. */ | |
116 | timevar_push (TV_CONFLICTS); | |
117 | conflicts_solve (); | |
118 | { | |
119 | state_number *old_to_new = xnmalloc (nstates, sizeof *old_to_new); | |
120 | state_number nstates_old = nstates; | |
121 | state_remove_unreachable_states (old_to_new); | |
122 | lalr_update_state_numbers (old_to_new, nstates_old); | |
123 | conflicts_update_state_numbers (old_to_new, nstates_old); | |
124 | free (old_to_new); | |
125 | } | |
126 | conflicts_print (); | |
127 | timevar_pop (TV_CONFLICTS); | |
128 | ||
129 | /* Compute the parser tables. */ | |
130 | timevar_push (TV_ACTIONS); | |
131 | tables_generate (); | |
132 | timevar_pop (TV_ACTIONS); | |
133 | ||
134 | grammar_rules_never_reduced_report | |
135 | (_("rule never reduced because of conflicts")); | |
136 | ||
137 | /* Output file names. */ | |
138 | compute_output_file_names (); | |
139 | ||
140 | /* Output the detailed report on the grammar. */ | |
141 | if (report_flag) | |
142 | { | |
143 | timevar_push (TV_REPORT); | |
144 | print_results (); | |
145 | timevar_pop (TV_REPORT); | |
146 | } | |
147 | ||
148 | /* Output the graph. */ | |
149 | if (graph_flag) | |
150 | { | |
151 | timevar_push (TV_GRAPH); | |
152 | print_graph (); | |
153 | timevar_pop (TV_GRAPH); | |
154 | } | |
155 | ||
156 | /* Stop if there were errors, to avoid trashing previous output | |
157 | files. */ | |
158 | if (complaint_issued) | |
159 | goto finish; | |
160 | ||
161 | /* Lookahead tokens are no longer needed. */ | |
162 | timevar_push (TV_FREE); | |
163 | lalr_free (); | |
164 | timevar_pop (TV_FREE); | |
165 | ||
166 | /* Output the tables and the parser to ftable. In file output. */ | |
167 | timevar_push (TV_PARSER); | |
168 | output (); | |
169 | timevar_pop (TV_PARSER); | |
170 | ||
171 | timevar_push (TV_FREE); | |
172 | nullable_free (); | |
173 | derives_free (); | |
174 | tables_free (); | |
175 | states_free (); | |
176 | reduce_free (); | |
177 | conflicts_free (); | |
178 | grammar_free (); | |
179 | output_file_names_free (); | |
180 | ||
181 | /* The scanner memory cannot be released right after parsing, as it | |
182 | contains things such as user actions, prologue, epilogue etc. */ | |
183 | gram_scanner_free (); | |
184 | muscle_free (); | |
185 | uniqstrs_free (); | |
186 | code_scanner_free (); | |
187 | skel_scanner_free (); | |
188 | quotearg_free (); | |
189 | timevar_pop (TV_FREE); | |
190 | ||
191 | if (trace_flag & trace_bitsets) | |
192 | bitset_stats_dump (stderr); | |
193 | ||
194 | finish: | |
195 | ||
196 | /* Stop timing and print the times. */ | |
197 | timevar_stop (TV_TOTAL); | |
198 | timevar_print (stderr); | |
199 | ||
200 | return complaint_issued ? EXIT_FAILURE : EXIT_SUCCESS; | |
201 | } |