Don't use m4_divert since it makes m4_divert_push and m4_divert_pop

[bison.git] / src / reduce.c

diff --git a/src/reduce.c b/src/reduce.c
index 57a408b6a5b1f987a496eb1d8a6baa9e287dcfff..1bb40f01bf5f0f34c142fc1e6e150ed97093eaaa 100644 (file)
--- a/src/reduce.c
+++ b/src/reduce.c
@@ -1,5 +1,7 @@
 /* Grammar reduction for Bison.
 /* Grammar reduction for Bison.

-   Copyright (C) 1988, 1989, 2000, 2001, 2002  Free Software Foundation, Inc.
+
+   Copyright (C) 1988, 1989, 2000, 2001, 2002, 2003, 2005, 2006 Free
+   Software Foundation, Inc.

 
    This file is part of Bison, the GNU Compiler Compiler.
 
 
    This file is part of Bison, the GNU Compiler Compiler.
 


@@ -15,8 +17,8 @@
 
    You should have received a copy of the GNU General Public License
    along with Bison; see the file COPYING.  If not, write to
 
    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., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
+   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.  */

 
 
 /* Reduce the grammar: Find and eliminate unreachable terminals,
 
 
 /* Reduce the grammar: Find and eliminate unreachable terminals,


@@ -25,17 +27,19 @@
 /* Don't eliminate unreachable terminals: They may be used by the
    user's parser.  */
 
 /* Don't eliminate unreachable terminals: They may be used by the
    user's parser.  */
 

+#include <config.h>

 #include "system.h"
 #include "system.h"

-#include "quotearg.h"
-#include "getargs.h"
+
+#include <bitset.h>
+#include <quotearg.h>
+
+#include "complain.h"

 #include "files.h"
 #include "files.h"

-#include "symtab.h"
+#include "getargs.h"

 #include "gram.h"
 #include "gram.h"

-#include "complain.h"
-#include "reduce.h"

 #include "reader.h"
 #include "reader.h"

-#include "getargs.h"
-#include "bitset.h"
+#include "reduce.h"
+#include "symtab.h"

 
 /* Set of all nonterminals which are not useless.  */
 static bitset N;
 
 /* Set of all nonterminals which are not useless.  */
 static bitset N;


@@ -50,10 +54,10 @@ static bitset V;
    `useless', but no warning should be issued).  */
 static bitset V1;
 
    `useless', but no warning should be issued).  */
 static bitset V1;
 

-static rule_number_t nuseful_productions;
-rule_number_t nuseless_productions;
+static rule_number nuseful_productions;
+rule_number nuseless_productions;

 static int nuseful_nonterminals;
 static int nuseful_nonterminals;

-symbol_number_t nuseless_nonterminals;
+symbol_number nuseless_nonterminals;

 \f
 /*-------------------------------------------------------------------.
 | Another way to do this would be with a set for each production and |
 \f
 /*-------------------------------------------------------------------.
 | Another way to do this would be with a set for each production and |


@@ -62,17 +66,17 @@ symbol_number_t nuseless_nonterminals;
 `-------------------------------------------------------------------*/
 
 static bool
 `-------------------------------------------------------------------*/
 
 static bool

-useful_production (rule_number_t r, bitset N0)
+useful_production (rule_number r, bitset N0)

 {
 {

-  item_number_t *rhsp;
+  item_number *rhsp;

 
   /* A production is useful if all of the nonterminals in its appear
      in the set of useful nonterminals.  */
 
   for (rhsp = rules[r].rhs; *rhsp >= 0; ++rhsp)
     if (ISVAR (*rhsp) && !bitset_test (N0, *rhsp - ntokens))
 
   /* A production is useful if all of the nonterminals in its appear
      in the set of useful nonterminals.  */
 
   for (rhsp = rules[r].rhs; *rhsp >= 0; ++rhsp)
     if (ISVAR (*rhsp) && !bitset_test (N0, *rhsp - ntokens))

-      return FALSE;
-  return TRUE;
+      return false;
+  return true;

 }
 
 
 }
 
 


@@ -84,7 +88,7 @@ static void
 useless_nonterminals (void)
 {
   bitset Np, Ns;
 useless_nonterminals (void)
 {
   bitset Np, Ns;

-  rule_number_t r;
+  rule_number r;

 
   /* N is set as built.  Np is set being built this iteration. P is
      set of all productions which have a RHS all in N.  */
 
   /* N is set as built.  Np is set being built this iteration. P is
      set of all productions which have a RHS all in N.  */


@@ -167,7 +171,7 @@ inaccessable_symbols (void)
 
       while (1)
        {
 
       while (1)
        {

-         rule_number_t r;
+         rule_number r;

          bitset_copy (Vp, V);
          for (r = 0; r < nrules; r++)
            {
          bitset_copy (Vp, V);
          for (r = 0; r < nrules; r++)
            {


@@ -175,7 +179,7 @@ inaccessable_symbols (void)
                  && bitset_test (P, r)
                  && bitset_test (V, rules[r].lhs->number))
                {
                  && bitset_test (P, r)
                  && bitset_test (V, rules[r].lhs->number))
                {

-                 item_number_t *rhsp;
+                 item_number *rhsp;

                  for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++)
                    if (ISTOKEN (*rhsp) || bitset_test (N, *rhsp - ntokens))
                      bitset_set (Vp, *rhsp);
                  for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++)
                    if (ISTOKEN (*rhsp) || bitset_test (N, *rhsp - ntokens))
                      bitset_set (Vp, *rhsp);


@@ -206,7 +210,7 @@ inaccessable_symbols (void)
 
   nuseful_nonterminals = 0;
   {
 
   nuseful_nonterminals = 0;
   {

-    symbol_number_t i;
+    symbol_number i;

     for (i = ntokens; i < nsyms; i++)
       if (bitset_test (V, i))
        nuseful_nonterminals++;
     for (i = ntokens; i < nsyms; i++)
       if (bitset_test (V, i))
        nuseful_nonterminals++;


@@ -215,7 +219,7 @@ inaccessable_symbols (void)
 
   /* A token that was used in %prec should not be warned about.  */
   {
 
   /* A token that was used in %prec should not be warned about.  */
   {

-    rule_number_t r;
+    rule_number r;

     for (r = 0; r < nrules; ++r)
       if (rules[r].precsym != 0)
        bitset_set (V1, rules[r].precsym->number);
     for (r = 0; r < nrules; ++r)
       if (rules[r].precsym != 0)
        bitset_set (V1, rules[r].precsym->number);


@@ -233,17 +237,10 @@ reduce_grammar_tables (void)
 {
   /* Report and flag useless productions.  */
   {
 {
   /* Report and flag useless productions.  */
   {

-    rule_number_t r;
+    rule_number r;

     for (r = 0; r < nrules; r++)
     for (r = 0; r < nrules; r++)

-      {
-       rules[r].useful = bitset_test (P, r);
-       if (!rules[r].useful)
-         {
-           LOCATION_PRINT (stderr, rules[r].location);
-           fprintf (stderr, ": %s: %s: ", _("warning"), _("useless rule"));
-           rule_print (&rules[r], stderr);
-         }
-      }
+      rules[r].useful = bitset_test (P, r);
+    grammar_rules_never_reduced_report (_("useless rule"));

   }
 
   /* Map the nonterminals to their new index: useful first, useless
   }
 
   /* Map the nonterminals to their new index: useful first, useless


@@ -251,8 +248,8 @@ reduce_grammar_tables (void)
   {
     int useful = 0;
     int useless = nrules - nuseless_productions;
   {
     int useful = 0;
     int useless = nrules - nuseless_productions;

-    rule_t *rules_sorted = XMALLOC (rule_t, nrules);
-    rule_number_t r;
+    rule *rules_sorted = xnmalloc (nrules, sizeof *rules_sorted);
+    rule_number r;

     for (r = 0; r < nrules; ++r)
       rules_sorted[rules[r].useful ? useful++ : useless++] = rules[r];
     free (rules);
     for (r = 0; r < nrules; ++r)
       rules_sorted[rules[r].useful ? useful++ : useless++] = rules[r];
     free (rules);


@@ -261,7 +258,7 @@ reduce_grammar_tables (void)
     /* Renumber the rules markers in RITEMS.  */
     for (r = 0; r < nrules; ++r)
       {
     /* Renumber the rules markers in RITEMS.  */
     for (r = 0; r < nrules; ++r)
       {

-       item_number_t *rhsp = rules[r].rhs;
+       item_number *rhsp = rules[r].rhs;

        for (/* Nothing. */; *rhsp >= 0; ++rhsp)
          /* Nothing. */;
        *rhsp = rule_number_as_item_number (r);
        for (/* Nothing. */; *rhsp >= 0; ++rhsp)
          /* Nothing. */;
        *rhsp = rule_number_as_item_number (r);


@@ -272,7 +269,7 @@ reduce_grammar_tables (void)
 
   /* Adjust NRITEMS.  */
   {
 
   /* Adjust NRITEMS.  */
   {

-    int r;
+    rule_number r;

     int length;
     for (r = nrules; r < nrules + nuseless_productions; ++r)
       {
     int length;
     for (r = nrules; r < nrules + nuseless_productions; ++r)
       {


@@ -290,56 +287,55 @@ reduce_grammar_tables (void)
 static void
 nonterminals_reduce (void)
 {
 static void
 nonterminals_reduce (void)
 {

-  symbol_number_t i, n;
+  symbol_number i, n;

 
   /* Map the nonterminals to their new index: useful first, useless
      afterwards.  Kept for later report.  */
 
 
   /* Map the nonterminals to their new index: useful first, useless
      afterwards.  Kept for later report.  */
 

-  symbol_number_t *nontermmap = XCALLOC (symbol_number_t, nvars) - ntokens;
+  symbol_number *nontermmap = xnmalloc (nvars, sizeof *nontermmap);

   n = ntokens;
   for (i = ntokens; i < nsyms; i++)
     if (bitset_test (V, i))
   n = ntokens;
   for (i = ntokens; i < nsyms; i++)
     if (bitset_test (V, i))

-      nontermmap[i] = n++;
+      nontermmap[i - ntokens] = n++;

   for (i = ntokens; i < nsyms; i++)
     if (!bitset_test (V, i))
       {
   for (i = ntokens; i < nsyms; i++)
     if (!bitset_test (V, i))
       {

-       nontermmap[i] = n++;
-       LOCATION_PRINT (stderr, symbols[i]->location);
-       fprintf (stderr, ": %s: %s: %s\n",
-                _("warning"), _("useless nonterminal"),
+       nontermmap[i - ntokens] = n++;
+       warn_at (symbols[i]->location, _("useless nonterminal: %s"),

                 symbols[i]->tag);
       }
 
 
   /* Shuffle elements of tables indexed by symbol number.  */
   {
                 symbols[i]->tag);
       }
 
 
   /* Shuffle elements of tables indexed by symbol number.  */
   {

-    symbol_t **symbols_sorted = XMALLOC (symbol_t *, nvars) - ntokens;
+    symbol **symbols_sorted = xnmalloc (nvars, sizeof *symbols_sorted);

 
     for (i = ntokens; i < nsyms; i++)
 
     for (i = ntokens; i < nsyms; i++)

-      symbols[i]->number = nontermmap[i];
+      symbols[i]->number = nontermmap[i - ntokens];

     for (i = ntokens; i < nsyms; i++)
     for (i = ntokens; i < nsyms; i++)

-      symbols_sorted[nontermmap[i]] = symbols[i];
+      symbols_sorted[nontermmap[i - ntokens] - ntokens] = symbols[i];

     for (i = ntokens; i < nsyms; i++)
     for (i = ntokens; i < nsyms; i++)

-      symbols[i] = symbols_sorted[i];
-    free (symbols_sorted + ntokens);
+      symbols[i] = symbols_sorted[i - ntokens];
+    free (symbols_sorted);

   }
 
   {
   }
 
   {

-    rule_number_t r;
+    rule_number r;

     for (r = 0; r < nrules; ++r)
       {
     for (r = 0; r < nrules; ++r)
       {

-       item_number_t *rhsp;
+       item_number *rhsp;

        for (rhsp = rules[r].rhs; *rhsp >= 0; ++rhsp)
          if (ISVAR (*rhsp))
        for (rhsp = rules[r].rhs; *rhsp >= 0; ++rhsp)
          if (ISVAR (*rhsp))

-           *rhsp =  symbol_number_as_item_number (nontermmap[*rhsp]);
+           *rhsp =  symbol_number_as_item_number (nontermmap[*rhsp
+                                                             - ntokens]);

       }
       }

-    accept->number = nontermmap[accept->number];
+    accept->number = nontermmap[accept->number - ntokens];

   }
 
   nsyms -= nuseless_nonterminals;
   nvars -= nuseless_nonterminals;
 
   }
 
   nsyms -= nuseless_nonterminals;
   nvars -= nuseless_nonterminals;
 

-  free (nontermmap + ntokens);
+  free (nontermmap);

 }
 
 
 }
 
 


@@ -353,21 +349,21 @@ reduce_output (FILE *out)
   if (nuseless_nonterminals > 0)
     {
       int i;
   if (nuseless_nonterminals > 0)
     {
       int i;

-      fprintf (out, "%s\n\n", _("Useless nonterminals:"));
+      fprintf (out, "%s\n\n", _("Useless nonterminals"));

       for (i = 0; i < nuseless_nonterminals; ++i)
        fprintf (out, "   %s\n", symbols[nsyms + i]->tag);
       fputs ("\n\n", out);
     }
 
   {
       for (i = 0; i < nuseless_nonterminals; ++i)
        fprintf (out, "   %s\n", symbols[nsyms + i]->tag);
       fputs ("\n\n", out);
     }
 
   {

-    bool b = FALSE;
+    bool b = false;

     int i;
     for (i = 0; i < ntokens; i++)
       if (!bitset_test (V, i) && !bitset_test (V1, i))
        {
          if (!b)
     int i;
     for (i = 0; i < ntokens; i++)
       if (!bitset_test (V, i) && !bitset_test (V1, i))
        {
          if (!b)

-           fprintf (out, "%s\n\n", _("Terminals which are not used:"));
-         b = TRUE;
+           fprintf (out, "%s\n\n", _("Terminals which are not used"));
+         b = true;

          fprintf (out, "   %s\n", symbols[i]->tag);
        }
     if (b)
          fprintf (out, "   %s\n", symbols[i]->tag);
        }
     if (b)


@@ -376,8 +372,7 @@ reduce_output (FILE *out)
 
   if (nuseless_productions > 0)
     grammar_rules_partial_print (out, _("Useless rules"),
 
   if (nuseless_productions > 0)
     grammar_rules_partial_print (out, _("Useless rules"),

-                                nrules,
-                                nrules + nuseless_productions);
+                                rule_useless_p);

 }
 \f
 
 }
 \f
 


@@ -397,7 +392,7 @@ reduce_print (void)
                               nuseless_productions),
             nuseless_productions);
 
                               nuseless_productions),
             nuseless_productions);
 

-  fprintf (stderr, "%s: %s: ", infile, _("warning"));
+  fprintf (stderr, "%s: %s: ", grammar_file, _("warning"));

 
   if (nuseless_nonterminals > 0)
     fprintf (stderr, ngettext ("%d useless nonterminal",
 
   if (nuseless_nonterminals > 0)
     fprintf (stderr, ngettext ("%d useless nonterminal",


@@ -414,7 +409,6 @@ reduce_print (void)
                               nuseless_productions),
             nuseless_productions);
   fprintf (stderr, "\n");
                               nuseless_productions),
             nuseless_productions);
   fprintf (stderr, "\n");

-  fflush (stderr);

 }
 \f
 void
 }
 \f
 void


@@ -432,7 +426,7 @@ reduce_grammar (void)
   useless_nonterminals ();
   inaccessable_symbols ();
 
   useless_nonterminals ();
   inaccessable_symbols ();
 

-  reduced = (bool) (nuseless_nonterminals + nuseless_productions > 0);
+  reduced = (nuseless_nonterminals + nuseless_productions > 0);

   if (!reduced)
     return;
 
   if (!reduced)
     return;
 


@@ -451,13 +445,13 @@ reduce_grammar (void)
   if (nuseless_productions > 0)
     reduce_grammar_tables ();
 
   if (nuseless_productions > 0)
     reduce_grammar_tables ();
 

-  if (trace_flag)
+  if (trace_flag & trace_grammar)

     {
       grammar_dump (stderr, "Reduced Grammar");
 
       fprintf (stderr, "reduced %s defines %d terminals, %d nonterminals\
 , and %d productions.\n",
     {
       grammar_dump (stderr, "Reduced Grammar");
 
       fprintf (stderr, "reduced %s defines %d terminals, %d nonterminals\
 , and %d productions.\n",

-              infile, ntokens, nvars, nrules);
+              grammar_file, ntokens, nvars, nrules);

     }
 }
 
     }
 }