style: use %code for local function declarations in our parser

[bison.git] / src / reduce.c

diff --git a/src/reduce.c b/src/reduce.c
index b9b6a3dde45d64ed5b985875f61a918adda359ee..eea11b1e20345158c318f2403b2a33f039ce20a1 100644 (file)
--- a/src/reduce.c
+++ b/src/reduce.c
@@ -1,24 +1,22 @@
 /* Grammar reduction for Bison.
 
 /* Grammar reduction for Bison.
 

-   Copyright (C) 1988, 1989, 2000, 2001, 2002, 2003 Free Software
+   Copyright (C) 1988-1989, 2000-2003, 2005-2013 Free Software

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


@@ -27,15 +25,16 @@
 /* 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 <bitset.h>
 #include "system.h"
 
 #include <bitset.h>

-#include <quotearg.h>

 
 #include "complain.h"
 #include "files.h"
 #include "getargs.h"
 #include "gram.h"
 
 #include "complain.h"
 #include "files.h"
 #include "getargs.h"
 #include "gram.h"

+#include "print-xml.h"

 #include "reader.h"
 #include "reduce.h"
 #include "symtab.h"
 #include "reader.h"
 #include "reduce.h"
 #include "symtab.h"


@@ -50,7 +49,7 @@ static bitset P;
 static bitset V;
 
 /* Set of symbols used to define rule precedence (so they are
 static bitset V;
 
 /* Set of symbols used to define rule precedence (so they are

-   `useless', but no warning should be issued).  */
+   'useless', but no warning should be issued).  */

 static bitset V1;
 
 static rule_number nuseful_productions;
 static bitset V1;
 
 static rule_number nuseful_productions;


@@ -115,14 +114,14 @@ useless_nonterminals (void)
     {
       bitset_copy (Np, N);
       for (r = 0; r < nrules; r++)
     {
       bitset_copy (Np, N);
       for (r = 0; r < nrules; r++)

-       if (!bitset_test (P, r)
-           && useful_production (r, N))
-         {
-           bitset_set (Np, rules[r].lhs->number - ntokens);
-           bitset_set (P, r);
-         }
+        if (!bitset_test (P, r)
+            && useful_production (r, N))
+          {
+            bitset_set (Np, rules[r].lhs->number - ntokens);
+            bitset_set (P, r);
+          }

       if (bitset_equal_p (N, Np))
       if (bitset_equal_p (N, Np))

-       break;
+        break;

       Ns = Np;
       Np = N;
       N = Ns;
       Ns = Np;
       Np = N;
       N = Ns;


@@ -169,37 +168,37 @@ inaccessable_symbols (void)
       bitset_set (V, accept->number);
 
       while (1)
       bitset_set (V, accept->number);
 
       while (1)

-       {
-         rule_number r;
-         bitset_copy (Vp, V);
-         for (r = 0; r < nrules; r++)
-           {
-             if (!bitset_test (Pp, r)
-                 && bitset_test (P, r)
-                 && bitset_test (V, rules[r].lhs->number))
-               {
-                 item_number *rhsp;
-                 for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++)
-                   if (ISTOKEN (*rhsp) || bitset_test (N, *rhsp - ntokens))
-                     bitset_set (Vp, *rhsp);
-                 bitset_set (Pp, r);
-               }
-           }
-         if (bitset_equal_p (V, Vp))
-           break;
-         Vs = Vp;
-         Vp = V;
-         V = Vs;
-       }
+        {
+          rule_number r;
+          bitset_copy (Vp, V);
+          for (r = 0; r < nrules; r++)
+            {
+              if (!bitset_test (Pp, r)
+                  && bitset_test (P, r)
+                  && bitset_test (V, rules[r].lhs->number))
+                {
+                  item_number *rhsp;
+                  for (rhsp = rules[r].rhs; *rhsp >= 0; rhsp++)
+                    if (ISTOKEN (*rhsp) || bitset_test (N, *rhsp - ntokens))
+                      bitset_set (Vp, *rhsp);
+                  bitset_set (Pp, r);
+                }
+            }
+          if (bitset_equal_p (V, Vp))
+            break;
+          Vs = Vp;
+          Vp = V;
+          V = Vs;
+        }

     }
 
   bitset_free (V);
   V = Vp;
 
   /* Tokens 0, 1, and 2 are internal to Bison.  Consider them useful. */
     }
 
   bitset_free (V);
   V = Vp;
 
   /* Tokens 0, 1, and 2 are internal to Bison.  Consider them useful. */

-  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, endtoken->number);             /* end-of-input token */
+  bitset_set (V, errtoken->number);             /* error token */
+  bitset_set (V, undeftoken->number);           /* some undefined token */

 
   bitset_free (P);
   P = Pp;
 
   bitset_free (P);
   P = Pp;


@@ -212,7 +211,7 @@ inaccessable_symbols (void)
     symbol_number i;
     for (i = ntokens; i < nsyms; i++)
       if (bitset_test (V, i))
     symbol_number i;
     for (i = ntokens; i < nsyms; i++)
       if (bitset_test (V, i))

-       nuseful_nonterminals++;
+        nuseful_nonterminals++;

   }
   nuseless_nonterminals = nvars - nuseful_nonterminals;
 
   }
   nuseless_nonterminals = nvars - nuseful_nonterminals;
 


@@ -221,7 +220,7 @@ inaccessable_symbols (void)
     rule_number r;
     for (r = 0; r < nrules; ++r)
       if (rules[r].precsym != 0)
     rule_number r;
     for (r = 0; r < nrules; ++r)
       if (rules[r].precsym != 0)

-       bitset_set (V1, rules[r].precsym->number);
+        bitset_set (V1, rules[r].precsym->number);

   }
 }
 
   }
 }
 


@@ -239,7 +238,7 @@ reduce_grammar_tables (void)
     rule_number r;
     for (r = 0; r < nrules; r++)
       rules[r].useful = bitset_test (P, r);
     rule_number r;
     for (r = 0; r < nrules; r++)
       rules[r].useful = bitset_test (P, r);

-    grammar_rules_never_reduced_report (_("useless rule"));
+    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


@@ -247,7 +246,7 @@ reduce_grammar_tables (void)
   {
     int useful = 0;
     int useless = nrules - nuseless_productions;
   {
     int useful = 0;
     int useless = nrules - nuseless_productions;

-    rule *rules_sorted = MALLOC (rules_sorted, nrules);
+    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];
     rule_number r;
     for (r = 0; r < nrules; ++r)
       rules_sorted[rules[r].useful ? useful++ : useless++] = rules[r];


@@ -257,11 +256,11 @@ 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 *rhsp = rules[r].rhs;
-       for (/* Nothing. */; *rhsp >= 0; ++rhsp)
-         /* Nothing. */;
-       *rhsp = rule_number_as_item_number (r);
-       rules[r].number = r;
+        item_number *rhsp = rules[r].rhs;
+        for (/* Nothing. */; *rhsp >= 0; ++rhsp)
+          /* Nothing. */;
+        *rhsp = rule_number_as_item_number (r);
+        rules[r].number = r;

       }
     nrules -= nuseless_productions;
   }
       }
     nrules -= nuseless_productions;
   }


@@ -272,8 +271,8 @@ reduce_grammar_tables (void)
     int length;
     for (r = nrules; r < nrules + nuseless_productions; ++r)
       {
     int length;
     for (r = nrules; r < nrules + nuseless_productions; ++r)
       {

-       length = rule_rhs_length (&rules[r]);
-       nritems -= length + 1;
+        length = rule_rhs_length (&rules[r]);
+        nritems -= length + 1;

       }
   }
 }
       }
   }
 }


@@ -286,28 +285,29 @@ reduce_grammar_tables (void)
 static void
 nonterminals_reduce (void)
 {
 static void
 nonterminals_reduce (void)
 {

-  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 *nontermmap = CALLOC (nontermmap, nvars);
-  n = ntokens;
+  symbol_number *nontermmap = xnmalloc (nvars, sizeof *nontermmap);
+  symbol_number n = ntokens;
+  symbol_number i;

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

-       nontermmap[i - ntokens] = n++;
-       warn_at (symbols[i]->location, _("useless nonterminal: %s"),
-                symbols[i]->tag);
+        nontermmap[i - ntokens] = n++;
+        if (symbols[i]->status != used)
+          complain (&symbols[i]->location, Wother,
+                    _("nonterminal useless in grammar: %s"),
+                    symbols[i]->tag);

       }
 
 
   /* Shuffle elements of tables indexed by symbol number.  */
   {
       }
 
 
   /* Shuffle elements of tables indexed by symbol number.  */
   {

-    symbol **symbols_sorted = MALLOC (symbols_sorted, nvars);
+    symbol **symbols_sorted = xnmalloc (nvars, sizeof *symbols_sorted);

 
     for (i = ntokens; i < nsyms; i++)
       symbols[i]->number = nontermmap[i - ntokens];
 
     for (i = ntokens; i < nsyms; i++)
       symbols[i]->number = nontermmap[i - ntokens];


@@ -322,11 +322,11 @@ nonterminals_reduce (void)
     rule_number r;
     for (r = 0; r < nrules; ++r)
       {
     rule_number r;
     for (r = 0; r < nrules; ++r)
       {

-       item_number *rhsp;
-       for (rhsp = rules[r].rhs; *rhsp >= 0; ++rhsp)
-         if (ISVAR (*rhsp))
-           *rhsp =  symbol_number_as_item_number (nontermmap[*rhsp
-                                                             - ntokens]);
+        item_number *rhsp;
+        for (rhsp = rules[r].rhs; *rhsp >= 0; ++rhsp)
+          if (ISVAR (*rhsp))
+            *rhsp =  symbol_number_as_item_number (nontermmap[*rhsp
+                                                              - ntokens]);

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


@@ -348,9 +348,9 @@ 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)
       for (i = 0; i < nuseless_nonterminals; ++i)

-       fprintf (out, "   %s\n", symbols[nsyms + i]->tag);
+        fprintf (out, "   %s\n", symbols[nsyms + i]->tag);

       fputs ("\n\n", out);
     }
 
       fputs ("\n\n", out);
     }
 


@@ -358,26 +358,23 @@ reduce_output (FILE *out)
     bool b = false;
     int i;
     for (i = 0; i < ntokens; i++)
     bool b = false;
     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", symbols[i]->tag);
-       }
+      if (reduce_token_unused_in_grammar (i))
+        {
+          if (!b)
+            fprintf (out, "%s\n\n", _("Terminals unused in grammar"));
+          b = true;
+          fprintf (out, "   %s\n", symbols[i]->tag);
+        }

     if (b)
       fputs ("\n\n", out);
   }
 
   if (nuseless_productions > 0)
     if (b)
       fputs ("\n\n", out);
   }
 
   if (nuseless_productions > 0)

-    grammar_rules_partial_print (out, _("Useless rules"),
-                                rule_useless_p);
+    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.  |
 `-------------------------------*/


@@ -385,29 +382,16 @@ 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: ", grammar_file, _("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 "));
-
+    complain (NULL, Wother, 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");
+    complain (NULL, Wother, ngettext ("%d rule useless in grammar",
+                                      "%d rules useless in grammar",
+                                      nuseless_productions),
+              nuseless_productions);

 }
 \f
 void
 }
 \f
 void


@@ -425,16 +409,16 @@ 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 (!bitset_test (N, accept->number - ntokens))
   if (!reduced)
     return;
 
   reduce_print ();
 
   if (!bitset_test (N, accept->number - ntokens))

-    fatal_at (startsymbol_location,
-             _("start symbol %s does not derive any sentence"),
-             startsymbol->tag);
+    complain (&startsymbol_location, fatal,
+              _("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


@@ -448,12 +432,25 @@ reduce_grammar (void)
     {
       grammar_dump (stderr, "Reduced Grammar");
 
     {
       grammar_dump (stderr, "Reduced Grammar");
 

-      fprintf (stderr, "reduced %s defines %d terminals, %d nonterminals\
-, and %d productions.\n",
-              grammar_file, ntokens, nvars, nrules);
+      fprintf (stderr, "reduced %s defines %d terminals, %d nonterminals"
+               ", and %d productions.\n",
+               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.  |