src/main.c

   1 /* Top level entry point of bison,
   2    Copyright 1984, 1986, 1989, 1992, 1995, 2000, 2001, 2002
   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 "bitset_stats.h"
  25 #include "bitset.h"
  26 #include "getargs.h"
  27 #include "symtab.h"
  28 #include "gram.h"
  29 #include "files.h"
  30 #include "complain.h"
  31 #include "derives.h"
  32 #include "output.h"
  33 #include "reader.h"
  34 #include "lalr.h"
  35 #include "reduce.h"
  36 #include "nullable.h"
  37 #include "print.h"
  38 #include "LR0.h"
  39 #include "conflicts.h"
  40 #include "print_graph.h"
  41 #include "muscle_tab.h"
  42 #include <malloc.h>
  43 #include <sys/times.h>
  44
  45 /* The name this program was run with, for messages.  */
  46 char *program_name;
  47
  48 static void
  49 stage (const char *title)
  50 {
  51   struct mallinfo minfo = mallinfo ();
  52   struct tms tinfo;
  53   times (&tinfo);
  54   fprintf (stderr, "STAGE: %30s: %9d (%9d): %ldu %lds\n",
  55            title,
  56            minfo.uordblks, minfo.arena,
  57            tinfo.tms_utime, tinfo.tms_stime);
  58 }
  59
  60 int
  61 main (int argc, char *argv[])
  62 {
  63   program_name = argv[0];
  64   setlocale (LC_ALL, "");
  65   bindtextdomain (PACKAGE, LOCALEDIR);
  66   textdomain (PACKAGE);
  67
  68   getargs (argc, argv);
  69
  70   if (trace_flag)
  71     bitset_stats_enable ();
  72
  73   muscle_init ();
  74
  75   stage ("initialized muscles");
  76
  77   /* Read the input.  Copy some parts of it to FGUARD, FACTION, FTABLE
  78      and FATTRS.  In file reader.c.  The other parts are recorded in
  79      the grammar; see gram.h.  */
  80   reader ();
  81
  82   stage ("reader");
  83
  84   if (complain_message_count)
  85     exit (1);
  86
  87   /* Find useless nonterminals and productions and reduce the grammar. */
  88   reduce_grammar ();
  89
  90   stage ("reduced grammar");
  91
  92   /* Record other info about the grammar.  In files derives and
  93      nullable.  */
  94   set_derives ();
  95   set_nullable ();
  96
  97   /* Convert to nondeterministic finite state machine.  In file LR0.
  98      See state.h for more info.  */
  99   generate_states ();
 100
 101   stage ("generated states");
 102   /* make it deterministic.  In file lalr.  */
 103   lalr ();
 104
 105   stage ("lalred");
 106   /* Find and record any conflicts: places where one token of
 107      lookahead is not enough to disambiguate the parsing.  In file
 108      conflicts.  Also resolve s/r conflicts based on precedence
 109      declarations.  */
 110   conflicts_solve ();
 111   conflicts_print ();
 112
 113   stage ("solved conflicts");
 114   /* Output file names. */
 115   compute_output_file_names ();
 116
 117   /* Output the detailed report on the grammar.  */
 118   if (report_flag)
 119     print_results ();
 120
 121   stage ("printed results");
 122   /* Stop if there were errors, to avoid trashing previous output
 123      files.  */
 124   if (complain_message_count)
 125     exit (1);
 126
 127   /* Output the VCG graph.  */
 128   if (graph_flag)
 129     print_graph ();
 130
 131   /* Output the tables and the parser to ftable.  In file output.  */
 132   output ();
 133   stage ("made output");
 134
 135   states_free ();
 136   stage ("freed states");
 137   reduce_free ();
 138   stage ("freed reduce");
 139   conflicts_free ();
 140   stage ("freed conflicts");
 141   free_nullable ();
 142   stage ("freed nullable");
 143   free_derives ();
 144   stage ("freed derives");
 145   grammar_free ();
 146   stage ("freed grammar");
 147
 148   /* The scanner memory cannot be released right after parsing, as it
 149      contains things such as user actions, prologue, epilogue etc.  */
 150   scanner_free ();
 151   stage ("freed scanner");
 152   muscle_free ();
 153   stage ("freed muscles");
 154   /* If using alloca.c, flush the alloca'ed memory for the benefit of
 155      people running Bison as a library in IDEs.  */
 156 #if C_ALLOCA
 157   alloca (0);
 158 #endif
 159
 160   if (trace_flag)
 161     bitset_stats_dump (stderr);
 162
 163   return complain_message_count ? EXIT_FAILURE : EXIT_SUCCESS;
 164 }