doc: clean up references to `Tracking Locations'.

[bison.git] / src / nullable.c

diff --git a/src/nullable.c b/src/nullable.c
index 497ec0ad0ad171a5bb03f486dc56efa25032e45f..c11aa53493e5358e3390325dbecf6286b28b28d7 100644 (file)
--- a/src/nullable.c
+++ b/src/nullable.c
@@ -1,30 +1,29 @@
 /* Calculate which nonterminals can expand into the null string for Bison.
 
-   Copyright (C) 1984, 1989, 2000, 2001, 2002, 2003, 2004 Free
-   Software Foundation, Inc.
+   Copyright (C) 1984, 1989, 2000-2006, 2009-2011 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., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 
 /* Set up NULLABLE, a vector saying which nonterminals can expand into
    the null string.  NULLABLE[I - NTOKENS] is nonzero if symbol I can
    do so.  */
 
+#include <config.h>
 #include "system.h"
 
 #include "getargs.h"
@@ -61,16 +60,16 @@ nullable_compute (void)
   symbol_number *s2;
   rule_list *p;
 
-  symbol_number *squeue = CALLOC (squeue, nvars);
-  short int *rcount = CALLOC (rcount, nrules);
+  symbol_number *squeue = xnmalloc (nvars, sizeof *squeue);
+  size_t *rcount = xcalloc (nrules, sizeof *rcount);
   /* RITEM contains all the rules, including useless productions.
      Hence we must allocate room for useless nonterminals too.  */
-  rule_list **rsets = CALLOC (rsets, nvars);
+  rule_list **rsets = xcalloc (nvars, sizeof *rsets);
   /* This is said to be more elements than we actually use.
      Supposedly NRITEMS - NRULES is enough.  But why take the risk?  */
-  rule_list *relts = CALLOC (relts, nritems + nvars + 1);
+  rule_list *relts = xnmalloc (nritems + nvars + 1, sizeof *relts);
 
-  CALLOC (nullable, nvars);
+  nullable = xcalloc (nvars, sizeof *nullable);
 
   s1 = s2 = squeue;
   p = relts;
@@ -103,8 +102,8 @@ nullable_compute (void)
        else
          {
            /* This rule has an empty RHS. */
-           if (item_number_as_rule_number (rules_ruleno->rhs[0]) != ruleno)
-             abort ();
+           aver (item_number_as_rule_number (rules_ruleno->rhs[0])
+                 == ruleno);
            if (rules_ruleno->useful
                && ! nullable[rules_ruleno->lhs->number - ntokens])
              {