Provide an additional sub-message for clarity.

[bison.git] / src / print.c

diff --git a/src/print.c b/src/print.c
index 07fd1d04c1c01afcd81680315518a98dee0648f6..4f362f8c3a049bac1e58d87f03b5b133d22b1a47 100644 (file)
--- a/src/print.c
+++ b/src/print.c
@@ -1,24 +1,22 @@
 /* Print information on generated parser, for bison,
 
 /* Print information on generated parser, for bison,
 

-   Copyright (C) 1984, 1986, 1989, 2000, 2001, 2002, 2003, 2004, 2005, 2007
-   Free Software Foundation, Inc.
+   Copyright (C) 1984, 1986, 1989, 2000, 2001, 2002, 2003, 2004, 2005,
+   2007, 2009 Free Software Foundation, Inc.

 
    This file is part of Bison, the GNU Compiler Compiler.
 
 
    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
    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
    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"
 
 #include <config.h>
 #include "system.h"


@@ -33,6 +31,7 @@
 #include "getargs.h"
 #include "gram.h"
 #include "lalr.h"
 #include "getargs.h"
 #include "gram.h"
 #include "lalr.h"

+#include "muscle-tab.h"

 #include "print.h"
 #include "reader.h"
 #include "reduce.h"
 #include "print.h"
 #include "reader.h"
 #include "reduce.h"


@@ -112,7 +111,8 @@ print_core (FILE *out, state *s)
        fprintf (out, " %s", symbols[*sp]->tag);
 
       /* Display the lookahead tokens?  */
        fprintf (out, " %s", symbols[*sp]->tag);
 
       /* Display the lookahead tokens?  */

-      if (report_flag & report_lookahead_tokens)
+      if (report_flag & report_lookahead_tokens
+          && item_number_is_rule_number (*sp1))

        state_rule_lookahead_tokens_print (s, &rules[r], out);
 
       fputc ('\n', out);
        state_rule_lookahead_tokens_print (s, &rules[r], out);
 
       fputc ('\n', out);


@@ -242,15 +242,16 @@ print_reductions (FILE *out, state *s)
 {
   transitions *trans = s->transitions;
   reductions *reds = s->reductions;
 {
   transitions *trans = s->transitions;
   reductions *reds = s->reductions;

-  rule *default_rule = NULL;
+  rule *default_reduction = NULL;

   size_t width = 0;
   int i, j;
   size_t width = 0;
   int i, j;

+  bool default_reduction_only = true;

 
   if (reds->num == 0)
     return;
 
   if (yydefact[s->number] != 0)
 
   if (reds->num == 0)
     return;
 
   if (yydefact[s->number] != 0)

-    default_rule = &rules[yydefact[s->number] - 1];
+    default_reduction = &rules[yydefact[s->number] - 1];

 
   bitset_zero (no_reduce_set);
   FOR_EACH_SHIFT (trans, i)
 
   bitset_zero (no_reduce_set);
   FOR_EACH_SHIFT (trans, i)


@@ -260,7 +261,7 @@ print_reductions (FILE *out, state *s)
       bitset_set (no_reduce_set, s->errs->symbols[i]->number);
 
   /* Compute the width of the lookahead token column.  */
       bitset_set (no_reduce_set, s->errs->symbols[i]->number);
 
   /* Compute the width of the lookahead token column.  */

-  if (default_rule)
+  if (default_reduction)

     width = strlen (_("$default"));
 
   if (reds->lookahead_tokens)
     width = strlen (_("$default"));
 
   if (reds->lookahead_tokens)


@@ -273,7 +274,7 @@ print_reductions (FILE *out, state *s)
            {
              if (! count)
                {
            {
              if (! count)
                {

-                 if (reds->rules[j] != default_rule)
+                 if (reds->rules[j] != default_reduction)

                    max_length (&width, symbols[i]->tag);
                  count = true;
                }
                    max_length (&width, symbols[i]->tag);
                  count = true;
                }


@@ -297,26 +298,32 @@ print_reductions (FILE *out, state *s)
       {
        bool defaulted = false;
        bool count = bitset_test (no_reduce_set, i);
       {
        bool defaulted = false;
        bool count = bitset_test (no_reduce_set, i);

+        if (count)
+          default_reduction_only = false;

 
        for (j = 0; j < reds->num; ++j)
          if (bitset_test (reds->lookahead_tokens[j], i))
            {
              if (! count)
                {
 
        for (j = 0; j < reds->num; ++j)
          if (bitset_test (reds->lookahead_tokens[j], i))
            {
              if (! count)
                {

-                 if (reds->rules[j] != default_rule)
-                   print_reduction (out, width,
-                                    symbols[i]->tag,
-                                    reds->rules[j], true);
+                 if (reds->rules[j] != default_reduction)
+                    {
+                      default_reduction_only = false;
+                      print_reduction (out, width,
+                                       symbols[i]->tag,
+                                       reds->rules[j], true);
+                    }

                  else
                    defaulted = true;
                  count = true;
                }
              else
                {
                  else
                    defaulted = true;
                  count = true;
                }
              else
                {

+                  default_reduction_only = false;

                  if (defaulted)
                    print_reduction (out, width,
                                     symbols[i]->tag,
                  if (defaulted)
                    print_reduction (out, width,
                                     symbols[i]->tag,

-                                    default_rule, true);
+                                    default_reduction, true);

                  defaulted = false;
                  print_reduction (out, width,
                                   symbols[i]->tag,
                  defaulted = false;
                  print_reduction (out, width,
                                   symbols[i]->tag,


@@ -325,9 +332,17 @@ print_reductions (FILE *out, state *s)
            }
       }
 
            }
       }
 

-  if (default_rule)
-    print_reduction (out, width,
-                    _("$default"), default_rule, true);
+  if (default_reduction)
+    {
+      char *default_reductions =
+        muscle_percent_define_get ("lr.default-reductions");
+      print_reduction (out, width, _("$default"), default_reduction, true);
+      aver (0 == strcmp (default_reductions, "all")
+            || (0 == strcmp (default_reductions, "consistent")
+                && default_reduction_only)
+            || (reds->num == 1 && reds->rules[0]->number == 0));
+      free (default_reductions);
+    }

 }
 
 
 }
 
 


@@ -371,15 +386,15 @@ print_state (FILE *out, state *s)
 | Print information on the whole grammar.  |
 `-----------------------------------------*/
 
 | Print information on the whole grammar.  |
 `-----------------------------------------*/
 

-#define END_TEST(End)                          \
-do {                                           \
-  if (column + strlen(buffer) > (End))         \
-    {                                          \
-      fprintf (out, "%s\n   ", buffer);                \
-      column = 3;                              \
-      buffer[0] = 0;                           \
-    }                                          \
-} while (0)
+#define END_TEST(End)                           \
+  do {                                          \
+    if (column + strlen (buffer) > (End))       \
+      {                                         \
+        fprintf (out, "%s\n   ", buffer);       \
+        column = 3;                             \
+        buffer[0] = 0;                          \
+      }                                         \
+  } while (0)

 
 
 static void
 
 
 static void


@@ -403,7 +418,7 @@ print_grammar (FILE *out)
        buffer[0] = 0;
        column = strlen (tag);
        fputs (tag, out);
        buffer[0] = 0;
        column = strlen (tag);
        fputs (tag, out);

-       END_TEST (50);
+       END_TEST (65);

        sprintf (buffer, " (%d)", i);
 
        for (r = 0; r < nrules; r++)
        sprintf (buffer, " (%d)", i);
 
        for (r = 0; r < nrules; r++)


@@ -447,14 +462,16 @@ print_grammar (FILE *out)
 
       if (left_count > 0)
        {
 
       if (left_count > 0)
        {

-         END_TEST (50);
+         END_TEST (65);

          sprintf (buffer + strlen (buffer), _(" on left:"));
 
          for (r = 0; r < nrules; r++)
            {
          sprintf (buffer + strlen (buffer), _(" on left:"));
 
          for (r = 0; r < nrules; r++)
            {

-             END_TEST (65);

              if (rules[r].lhs->number == i)
              if (rules[r].lhs->number == i)

-               sprintf (buffer + strlen (buffer), " %d", r);
+               {
+                 END_TEST (65);
+                 sprintf (buffer + strlen (buffer), " %d", r);
+               }

            }
        }
 
            }
        }
 


@@ -462,7 +479,7 @@ print_grammar (FILE *out)
        {
          if (left_count > 0)
            sprintf (buffer + strlen (buffer), ",");
        {
          if (left_count > 0)
            sprintf (buffer + strlen (buffer), ",");

-         END_TEST (50);
+         END_TEST (65);

          sprintf (buffer + strlen (buffer), _(" on right:"));
          for (r = 0; r < nrules; r++)
            {
          sprintf (buffer + strlen (buffer), _(" on right:"));
          for (r = 0; r < nrules; r++)
            {


@@ -491,7 +508,8 @@ print_results (void)
 
   reduce_output (out);
   grammar_rules_partial_print (out,
 
   reduce_output (out);
   grammar_rules_partial_print (out,

-                              _("Rules never reduced"), rule_never_reduced_p);
+                              _("Rules useless in parser due to conflicts"),
+                                 rule_useless_in_parser_p);

   conflicts_output (out);
 
   print_grammar (out);
   conflicts_output (out);
 
   print_grammar (out);