src/main.c

   1 /* Top level entry point of Bison.
   2
   3    Copyright (C) 1984, 1986, 1989, 1992, 1995, 2000-2002, 2004-2015 Free
   4    Software Foundation, Inc.
   5
   6    This file is part of Bison, the GNU Compiler Compiler.
   7
   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.
  12
  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.
  17
  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/>.  */
  20
  21 #include <config.h>
  22 #include "system.h"
  23
  24 #include <bitset_stats.h>
  25 #include <bitset.h>
  26 #include <configmake.h>
  27 #include <progname.h>
  28 #include <quotearg.h>
  29 #include <timevar.h>
  30
  31 #include "LR0.h"
  32 #include "closeout.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 "ielr.h"
  41 #include "muscle-tab.h"
  42 #include "nullable.h"
  43 #include "output.h"
  44 #include "print.h"
  45 #include "print_graph.h"
  46 #include "print-xml.h"
  47 #include <quote.h>
  48 #include "reader.h"
  49 #include "reduce.h"
  50 #include "scan-code.h"
  51 #include "scan-gram.h"
  52 #include "scan-skel.h"
  53 #include "symtab.h"
  54 #include "tables.h"
  55 #include "uniqstr.h"
  56
  57
  58 int
  59 main (int argc, char *argv[])
  60 {
  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);
  66
  67   {
  68     char const *cp = getenv ("LC_CTYPE");
  69     if (cp && STREQ (cp, "C"))
  70       set_custom_quoting (&quote_quoting_options, "'", "'");
  71     else
  72       set_quoting_style (&quote_quoting_options, locale_quoting_style);
  73   }
  74
  75   atexit (close_stdout);
  76
  77   uniqstrs_new ();
  78   muscle_init ();
  79   complain_init ();
  80
  81   getargs (argc, argv);
  82
  83   timevar_report = trace_flag & trace_time;
  84   init_timevar ();
  85   timevar_start (TV_TOTAL);
  86
  87   if (trace_flag & trace_bitsets)
  88     bitset_stats_enable ();
  89
  90   /* Read the input.  Copy some parts of it to FGUARD, FACTION, FTABLE
  91      and FATTRS.  In file reader.c.  The other parts are recorded in
  92      the grammar; see gram.h.  */
  93
  94   timevar_push (TV_READER);
  95   reader ();
  96   timevar_pop (TV_READER);
  97
  98   if (complaint_status == status_complaint)
  99     goto finish;
 100
 101   /* Find useless nonterminals and productions and reduce the grammar. */
 102   timevar_push (TV_REDUCE);
 103   reduce_grammar ();
 104   timevar_pop (TV_REDUCE);
 105
 106   /* Record other info about the grammar.  In files derives and
 107      nullable.  */
 108   timevar_push (TV_SETS);
 109   derives_compute ();
 110   nullable_compute ();
 111   timevar_pop (TV_SETS);
 112
 113   /* Compute LR(0) parser states.  See state.h for more info.  */
 114   timevar_push (TV_LR0);
 115   generate_states ();
 116   timevar_pop (TV_LR0);
 117
 118   /* Add lookahead sets to parser states.  Except when LALR(1) is
 119      requested, split states to eliminate LR(1)-relative
 120      inadequacies.  */
 121   ielr ();
 122
 123   /* Find and record any conflicts: places where one token of
 124      lookahead is not enough to disambiguate the parsing.  In file
 125      conflicts.  Also resolve s/r conflicts based on precedence
 126      declarations.  */
 127   timevar_push (TV_CONFLICTS);
 128   conflicts_solve ();
 129   if (!muscle_percent_define_flag_if ("lr.keep-unreachable-state"))
 130     {
 131       state_number *old_to_new = xnmalloc (nstates, sizeof *old_to_new);
 132       state_number nstates_old = nstates;
 133       state_remove_unreachable_states (old_to_new);
 134       lalr_update_state_numbers (old_to_new, nstates_old);
 135       conflicts_update_state_numbers (old_to_new, nstates_old);
 136       free (old_to_new);
 137     }
 138   conflicts_print ();
 139   timevar_pop (TV_CONFLICTS);
 140
 141   /* Compute the parser tables.  */
 142   timevar_push (TV_ACTIONS);
 143   tables_generate ();
 144   timevar_pop (TV_ACTIONS);
 145
 146   grammar_rules_useless_report (_("rule useless in parser due to conflicts"));
 147
 148   print_precedence_warnings ();
 149
 150   /* Output file names. */
 151   compute_output_file_names ();
 152
 153   /* Output the detailed report on the grammar.  */
 154   if (report_flag)
 155     {
 156       timevar_push (TV_REPORT);
 157       print_results ();
 158       timevar_pop (TV_REPORT);
 159     }
 160
 161   /* Output the graph.  */
 162   if (graph_flag)
 163     {
 164       timevar_push (TV_GRAPH);
 165       print_graph ();
 166       timevar_pop (TV_GRAPH);
 167     }
 168
 169   /* Output xml.  */
 170   if (xml_flag)
 171     {
 172       timevar_push (TV_XML);
 173       print_xml ();
 174       timevar_pop (TV_XML);
 175     }
 176
 177   /* Stop if there were errors, to avoid trashing previous output
 178      files.  */
 179   if (complaint_status == status_complaint)
 180     goto finish;
 181
 182   /* Lookahead tokens are no longer needed. */
 183   timevar_push (TV_FREE);
 184   lalr_free ();
 185   timevar_pop (TV_FREE);
 186
 187   /* Output the tables and the parser to ftable.  In file output.  */
 188   timevar_push (TV_PARSER);
 189   output ();
 190   timevar_pop (TV_PARSER);
 191
 192   timevar_push (TV_FREE);
 193   nullable_free ();
 194   derives_free ();
 195   tables_free ();
 196   states_free ();
 197   reduce_free ();
 198   conflicts_free ();
 199   grammar_free ();
 200   output_file_names_free ();
 201
 202   /* The scanner memory cannot be released right after parsing, as it
 203      contains things such as user actions, prologue, epilogue etc.  */
 204   gram_scanner_free ();
 205   muscle_free ();
 206   uniqstrs_free ();
 207   code_scanner_free ();
 208   skel_scanner_free ();
 209   quotearg_free ();
 210   timevar_pop (TV_FREE);
 211
 212   if (trace_flag & trace_bitsets)
 213     bitset_stats_dump (stderr);
 214
 215  finish:
 216
 217   /* Stop timing and print the times.  */
 218   timevar_stop (TV_TOTAL);
 219   timevar_print (stderr);
 220
 221   cleanup_caret ();
 222
 223   return complaint_status ? EXIT_FAILURE : EXIT_SUCCESS;
 224 }