Document how `%define "var" "value"' is not M4-friendly.

[bison.git] / src / main.c

diff --git a/src/main.c b/src/main.c
index d64f92194d6e14aad00126130bd75c3f42d1d4c3..ed0893fdf3e7ec29a95067435f10afcafc647c79 100644 (file)
--- a/src/main.c
+++ b/src/main.c
@@ -1,24 +1,22 @@
 /* Top level entry point of Bison.
 
    Copyright (C) 1984, 1986, 1989, 1992, 1995, 2000, 2001, 2002, 2004,
-   2005, 2006, 2007 Free Software Foundation, Inc.
+   2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
-   Bison is free software; you can redistribute it and/or modify
+   This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
 
-   Bison is distributed in the hope that it will be useful,
+   This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with Bison; see the file COPYING.  If not, write to
-   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include <config.h>
 #include "system.h"
@@ -37,11 +35,13 @@
 #include "getargs.h"
 #include "gram.h"
 #include "lalr.h"
-#include "muscle_tab.h"
+#include "ielr.h"
+#include "muscle-tab.h"
 #include "nullable.h"
 #include "output.h"
 #include "print.h"
 #include "print_graph.h"
+#include "print-xml.h"
 #include "reader.h"
 #include "reduce.h"
 #include "scan-code.h"
@@ -63,6 +63,7 @@ main (int argc, char *argv[])
   (void) textdomain (PACKAGE);
 
   uniqstrs_new ();
+  muscle_init ();
 
   getargs (argc, argv);
 
@@ -73,8 +74,6 @@ main (int argc, char *argv[])
   if (trace_flag & trace_bitsets)
     bitset_stats_enable ();
 
-  muscle_init ();
-
   /* Read the input.  Copy some parts of it to FGUARD, FACTION, FTABLE
      and FATTRS.  In file reader.c.  The other parts are recorded in
      the grammar; see gram.h.  */
@@ -104,10 +103,10 @@ main (int argc, char *argv[])
   generate_states ();
   timevar_pop (TV_LR0);
 
-  /* make it deterministic.  In file lalr.  */
-  timevar_push (TV_LALR);
-  lalr ();
-  timevar_pop (TV_LALR);
+  /* Make it deterministic by computing lookahead sets.  Except when LALR(1) is
+     requested, split states to eliminate LR(1)-relative inadequacies.  In file
+     lalr and ielr.  */
+  ielr ();
 
   /* Find and record any conflicts: places where one token of
      lookahead is not enough to disambiguate the parsing.  In file
@@ -115,6 +114,16 @@ main (int argc, char *argv[])
      declarations.  */
   timevar_push (TV_CONFLICTS);
   conflicts_solve ();
+  muscle_percent_define_default ("lr.keep_unreachable_states", "false");
+  if (!muscle_percent_define_flag_if ("lr.keep_unreachable_states"))
+    {
+      state_number *old_to_new = xnmalloc (nstates, sizeof *old_to_new);
+      state_number nstates_old = nstates;
+      state_remove_unreachable_states (old_to_new);
+      lalr_update_state_numbers (old_to_new, nstates_old);
+      conflicts_update_state_numbers (old_to_new, nstates_old);
+      free (old_to_new);
+    }
   conflicts_print ();
   timevar_pop (TV_CONFLICTS);
 
@@ -123,8 +132,8 @@ main (int argc, char *argv[])
   tables_generate ();
   timevar_pop (TV_ACTIONS);
 
-  grammar_rules_never_reduced_report
-    (_("rule never reduced because of conflicts"));
+  grammar_rules_useless_report
+    (_("rule useless in parser due to conflicts"));
 
   /* Output file names. */
   compute_output_file_names ();
@@ -145,6 +154,14 @@ main (int argc, char *argv[])
       timevar_pop (TV_GRAPH);
     }
 
+  /* Output xml.  */
+  if (xml_flag)
+    {
+      timevar_push (TV_XML);
+      print_xml ();
+      timevar_pop (TV_XML);
+    }
+
   /* Stop if there were errors, to avoid trashing previous output
      files.  */
   if (complaint_issued)