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
  43 /* The name this program was run with, for messages.  */
  44 char *program_name;
  45
  46
  47 /*--------------------------.
  48 | Tracking space and time.  |
  49 `--------------------------*/
  50
  51 static void
  52 stage (const char *title)
  53 {
  54 #if HAVE_MALLINFO && HAVE_STRUCT_MALLINFO & HAVE_TIMES & HAVE_STRUCT_TMS
  55   if (trace_flag & trace_resource)
  56     {
  57       struct mallinfo minfo = mallinfo ();
  58       struct tms tinfo;
  59       times (&tinfo);
  60       fprintf (stderr, "STAGE: %30s: %9d (%9d): %ldu %lds\n",
  61                title,
  62                minfo.uordblks, minfo.arena,
  63                tinfo.tms_utime, tinfo.tms_stime);
  64     }
  65 #endif
  66 }
  67
  68
  69 int
  70 main (int argc, char *argv[])
  71 {
  72   program_name = argv[0];
  73   setlocale (LC_ALL, "");
  74   bindtextdomain (PACKAGE, LOCALEDIR);
  75   textdomain (PACKAGE);
  76
  77   getargs (argc, argv);
  78
  79   if (trace_flag & trace_bitsets)
  80     bitset_stats_enable ();
  81
  82   muscle_init ();
  83
  84   stage ("initialized muscles");
  85
  86   /* Read the input.  Copy some parts of it to FGUARD, FACTION, FTABLE
  87      and FATTRS.  In file reader.c.  The other parts are recorded in
  88      the grammar; see gram.h.  */
  89   reader ();
  90
  91   stage ("reader");
  92
  93   if (complain_message_count)
  94     exit (1);
  95
  96   /* Find useless nonterminals and productions and reduce the grammar. */
  97   reduce_grammar ();
  98
  99   stage ("reduced grammar");
 100
 101   /* Record other info about the grammar.  In files derives and
 102      nullable.  */
 103   set_derives ();
 104   set_nullable ();
 105
 106   /* Convert to nondeterministic finite state machine.  In file LR0.
 107      See state.h for more info.  */
 108   generate_states ();
 109
 110   stage ("generated states");
 111   /* make it deterministic.  In file lalr.  */
 112   lalr ();
 113
 114   stage ("lalred");
 115   /* Find and record any conflicts: places where one token of
 116      lookahead is not enough to disambiguate the parsing.  In file
 117      conflicts.  Also resolve s/r conflicts based on precedence
 118      declarations.  */
 119   conflicts_solve ();
 120   conflicts_print ();
 121
 122   stage ("solved conflicts");
 123   /* Output file names. */
 124   compute_output_file_names ();
 125
 126   /* Output the detailed report on the grammar.  */
 127   if (report_flag)
 128     print_results ();
 129
 130   stage ("printed results");
 131   /* Stop if there were errors, to avoid trashing previous output
 132      files.  */
 133   if (complain_message_count)
 134     exit (1);
 135
 136   /* Output the VCG graph.  */
 137   if (graph_flag)
 138     print_graph ();
 139
 140   /* Output the tables and the parser to ftable.  In file output.  */
 141   output ();
 142   stage ("made output");
 143
 144   states_free ();
 145   stage ("freed states");
 146   reduce_free ();
 147   stage ("freed reduce");
 148   conflicts_free ();
 149   stage ("freed conflicts");
 150   free_nullable ();
 151   stage ("freed nullable");
 152   free_derives ();
 153   stage ("freed derives");
 154   grammar_free ();
 155   stage ("freed grammar");
 156
 157   /* The scanner memory cannot be released right after parsing, as it
 158      contains things such as user actions, prologue, epilogue etc.  */
 159   scanner_free ();
 160   stage ("freed scanner");
 161   muscle_free ();
 162   stage ("freed muscles");
 163   /* If using alloca.c, flush the alloca'ed memory for the benefit of
 164      people running Bison as a library in IDEs.  */
 165 #if C_ALLOCA
 166   alloca (0);
 167 #endif
 168
 169   if (trace_flag & trace_bitsets)
 170     bitset_stats_dump (stderr);
 171
 172   return complain_message_count ? EXIT_FAILURE : EXIT_SUCCESS;
 173 }