maint: update gnu-web-doc-update.

[bison.git] / src / reduce.c

diff --git a/src/reduce.c b/src/reduce.c
index 154e63bf404af9d6279b2dde8044a3268fae58d8..5338393c312be029a027ec3dc1cef1d04a97a77d 100644 (file)
--- a/src/reduce.c
+++ b/src/reduce.c
@@ -1,22 +1,22 @@
 /* Grammar reduction for Bison.
 /* Grammar reduction for Bison.

-   Copyright (C) 1988, 1989, 2000, 2001, 2002  Free Software Foundation, Inc.
+
+   Copyright (C) 1988-1989, 2000-2003, 2005-2012 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., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

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


@@ -25,17 +25,19 @@
 /* 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 "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 "print-xml.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 +52,10 @@ 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 +64,17 @@ 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 +86,7 @@ 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.  */


@@ -161,13 +163,13 @@ inaccessable_symbols (void)
   Pp = bitset_create (nrules, BITSET_FIXED);
 
   /* If the start symbol isn't useful, then nothing will be useful. */
   Pp = bitset_create (nrules, BITSET_FIXED);
 
   /* If the start symbol isn't useful, then nothing will be useful. */

-  if (bitset_test (N, axiom->number - ntokens))
+  if (bitset_test (N, accept->number - ntokens))

     {
     {

-      bitset_set (V, axiom->number);
+      bitset_set (V, accept->number);

 
       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 +177,7 @@ 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);


@@ -194,7 +196,7 @@ inaccessable_symbols (void)
   V = Vp;
 
   /* Tokens 0, 1, and 2 are internal to Bison.  Consider them useful. */
   V = Vp;
 
   /* Tokens 0, 1, and 2 are internal to Bison.  Consider them useful. */

-  bitset_set (V, eoftoken->number);            /* end-of-input token */
+  bitset_set (V, endtoken->number);            /* end-of-input token */

   bitset_set (V, errtoken->number);            /* error token */
   bitset_set (V, undeftoken->number);          /* some undefined token */
 
   bitset_set (V, errtoken->number);            /* error token */
   bitset_set (V, undeftoken->number);          /* some undefined token */
 


@@ -206,7 +208,7 @@ 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 +217,7 @@ 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 +235,10 @@ 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_useless_report (_("rule useless in grammar"));

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


@@ -251,8 +246,8 @@ 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 +256,7 @@ 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 +267,7 @@ 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 +285,55 @@ 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, _("nonterminal useless in grammar: %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]);

       }
       }

-    axiom->number = nontermmap[axiom->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 +347,21 @@ 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", _("Nonterminals useless in grammar"));

       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++)
     int i;
     for (i = 0; i < ntokens; i++)

-      if (!bitset_test (V, i) && !bitset_test (V1, i))
+      if (reduce_token_unused_in_grammar (i))

        {
          if (!b)
        {
          if (!b)

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

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


@@ -375,15 +369,11 @@ reduce_output (FILE *out)
   }
 
   if (nuseless_productions > 0)
   }
 
   if (nuseless_productions > 0)

-    grammar_rules_partial_print (out, _("Useless rules"),
-                                nrules,
-                                nrules + nuseless_productions);
+    grammar_rules_partial_print (out, _("Rules useless in grammar"),
+                                rule_useless_in_grammar_p);

 }
 \f
 
 }
 \f
 

-
-
-

 /*-------------------------------.
 | Report the results to STDERR.  |
 `-------------------------------*/
 /*-------------------------------.
 | Report the results to STDERR.  |
 `-------------------------------*/


@@ -391,30 +381,16 @@ reduce_output (FILE *out)
 static void
 reduce_print (void)
 {
 static void
 reduce_print (void)
 {

-  if (yacc_flag && nuseless_productions)
-    fprintf (stderr, ngettext ("%d rule never reduced\n",
-                              "%d rules never reduced\n",
-                              nuseless_productions),
-            nuseless_productions);
-
-  fprintf (stderr, "%s: %s: ", infile, _("warning"));
-

   if (nuseless_nonterminals > 0)
   if (nuseless_nonterminals > 0)

-    fprintf (stderr, ngettext ("%d useless nonterminal",
-                              "%d useless nonterminals",
-                              nuseless_nonterminals),
-            nuseless_nonterminals);
-
-  if (nuseless_nonterminals > 0 && nuseless_productions > 0)
-    fprintf (stderr, _(" and "));
-
+    warn (ngettext ("%d nonterminal useless in grammar",
+                    "%d nonterminals useless in grammar",
+                    nuseless_nonterminals),
+          nuseless_nonterminals);

   if (nuseless_productions > 0)
   if (nuseless_productions > 0)

-    fprintf (stderr, ngettext ("%d useless rule",
-                              "%d useless rules",
-                              nuseless_productions),
-            nuseless_productions);
-  fprintf (stderr, "\n");
-  fflush (stderr);
+    warn (ngettext ("%d rule useless in grammar",
+                    "%d rules useless in grammar",
+                    nuseless_productions),
+          nuseless_productions);

 }
 \f
 void
 }
 \f
 void


@@ -432,15 +408,16 @@ 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;
 
   reduce_print ();
 
   if (!reduced)
     return;
 
   reduce_print ();
 

-  if (!bitset_test (N, axiom->number - ntokens))
-    fatal (_("Start symbol %s does not derive any sentence"),
-          symbols[axiom->number]->tag);
+  if (!bitset_test (N, accept->number - ntokens))
+    fatal_at (startsymbol_location,
+             _("start symbol %s does not derive any sentence"),
+             startsymbol->tag);

 
   /* First reduce the nonterminals, as they renumber themselves in the
      whole grammar.  If you change the order, nonterms would be
 
   /* First reduce the nonterminals, as they renumber themselves in the
      whole grammar.  If you change the order, nonterms would be


@@ -450,16 +427,29 @@ 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);

     }
 }
 
     }
 }
 

+bool
+reduce_token_unused_in_grammar (symbol_number i)
+{
+  aver (i < ntokens);
+  return !bitset_test (V, i) && !bitset_test (V1, i);
+}
+
+bool
+reduce_nonterminal_useless_in_grammar (symbol_number i)
+{
+  aver (ntokens <= i && i < nsyms + nuseless_nonterminals);
+  return nsyms <= i;
+}

 
 /*-----------------------------------------------------------.
 | Free the global sets used to compute the reduced grammar.  |
 
 /*-----------------------------------------------------------.
 | Free the global sets used to compute the reduced grammar.  |