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 #if HAVE_MALLOC_H & HAVE_SYS_TIMES_H
  52 # include <malloc.h>
  53 # include <sys/times.h>
  54 #endif
  55
  56 static void
  57 stage (const char *title)
  58 {
  59 #if HAVE_MALLOC_H & HAVE_SYS_TIMES_H
  60   if (trace_flag)
  61     {
  62       struct mallinfo minfo = mallinfo ();
  63       struct tms tinfo;
  64       times (&tinfo);
  65       fprintf (stderr, "STAGE: %30s: %9d (%9d): %ldu %lds\n",
  66                title,
  67                minfo.uordblks, minfo.arena,
  68                tinfo.tms_utime, tinfo.tms_stime);
  69     }
  70 #endif
  71 }
  72
  73
  74 int
  75 main (int argc, char *argv[])
  76 {
  77   program_name = argv[0];
  78   setlocale (LC_ALL, "");
  79   bindtextdomain (PACKAGE, LOCALEDIR);
  80   textdomain (PACKAGE);
  81
  82   getargs (argc, argv);
  83
  84   if (trace_flag)
  85     bitset_stats_enable ();
  86
  87   muscle_init ();
  88
  89   stage ("initialized muscles");
  90
  91   /* Read the input.  Copy some parts of it to FGUARD, FACTION, FTABLE
  92      and FATTRS.  In file reader.c.  The other parts are recorded in
  93      the grammar; see gram.h.  */
  94   reader ();
  95
  96   stage ("reader");
  97
  98   if (complain_message_count)
  99     exit (1);
 100
 101   /* Find useless nonterminals and productions and reduce the grammar. */
 102   reduce_grammar ();
 103
 104   stage ("reduced grammar");
 105
 106   /* Record other info about the grammar.  In files derives and
 107      nullable.  */
 108   set_derives ();
 109   set_nullable ();
 110
 111   /* Convert to nondeterministic finite state machine.  In file LR0.
 112      See state.h for more info.  */
 113   generate_states ();
 114
 115   stage ("generated states");
 116   /* make it deterministic.  In file lalr.  */
 117   lalr ();
 118
 119   stage ("lalred");
 120   /* Find and record any conflicts: places where one token of
 121      lookahead is not enough to disambiguate the parsing.  In file
 122      conflicts.  Also resolve s/r conflicts based on precedence
 123      declarations.  */
 124   conflicts_solve ();
 125   conflicts_print ();
 126
 127   stage ("solved conflicts");
 128   /* Output file names. */
 129   compute_output_file_names ();
 130
 131   /* Output the detailed report on the grammar.  */
 132   if (report_flag)
 133     print_results ();
 134
 135   stage ("printed results");
 136   /* Stop if there were errors, to avoid trashing previous output
 137      files.  */
 138   if (complain_message_count)
 139     exit (1);
 140
 141   /* Output the VCG graph.  */
 142   if (graph_flag)
 143     print_graph ();
 144
 145   /* Output the tables and the parser to ftable.  In file output.  */
 146   output ();
 147   stage ("made output");
 148
 149   states_free ();
 150   stage ("freed states");
 151   reduce_free ();
 152   stage ("freed reduce");
 153   conflicts_free ();
 154   stage ("freed conflicts");
 155   free_nullable ();
 156   stage ("freed nullable");
 157   free_derives ();
 158   stage ("freed derives");
 159   grammar_free ();
 160   stage ("freed grammar");
 161
 162   /* The scanner memory cannot be released right after parsing, as it
 163      contains things such as user actions, prologue, epilogue etc.  */
 164   scanner_free ();
 165   stage ("freed scanner");
 166   muscle_free ();
 167   stage ("freed muscles");
 168   /* If using alloca.c, flush the alloca'ed memory for the benefit of
 169      people running Bison as a library in IDEs.  */
 170 #if C_ALLOCA
 171   alloca (0);
 172 #endif
 173
 174   if (trace_flag)
 175     bitset_stats_dump (stderr);
 176
 177   return complain_message_count ? EXIT_FAILURE : EXIT_SUCCESS;
 178 }