doc: clean up references to `Tracking Locations'.

[bison.git] / src / closure.c

diff --git a/src/closure.c b/src/closure.c
index 618846dc8d40b92a233256b72bc76aebae7a5a13..0904f3a6f5e408308d408b698954dc92a755447c 100644 (file)
--- a/src/closure.c
+++ b/src/closure.c
@@ -1,24 +1,24 @@
 /* Closures for Bison
 
-   Copyright (C) 1984, 1989, 2000, 2001, 2002 Free Software Foundation, Inc.
+   Copyright (C) 1984, 1989, 2000-2002, 2004-2005, 2007, 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 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.
+   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 3 of the License, or
+   (at your option) any later version.
 
-   Bison 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.
+   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/>.  */
 
+#include <config.h>
 #include "system.h"
 
 #include <bitset.h>
@@ -35,7 +35,7 @@
 
 /* NITEMSET is the size of the array ITEMSET.  */
 item_number *itemset;
-int nritemset;
+size_t nitemset;
 
 static bitset ruleset;
 
@@ -128,9 +128,9 @@ set_firsts (void)
   firsts = bitsetv_create (nvars, nvars, BITSET_FIXED);
 
   for (i = ntokens; i < nsyms; i++)
-    for (j = 0; derives[i][j]; ++j)
+    for (j = 0; derives[i - ntokens][j]; ++j)
       {
-       item_number sym = derives[i][j]->rhs[0];
+       item_number sym = derives[i - ntokens][j]->rhs[0];
        if (ISVAR (sym))
          bitset_set (FIRSTS (i), sym - ntokens);
       }
@@ -168,8 +168,8 @@ set_fderives (void)
   for (i = ntokens; i < nsyms; ++i)
     for (j = ntokens; j < nsyms; ++j)
       if (bitset_test (FIRSTS (i), j - ntokens))
-       for (k = 0; derives[j][k]; ++k)
-         bitset_set (FDERIVES (i), derives[j][k]->number);
+       for (k = 0; derives[j - ntokens][k]; ++k)
+         bitset_set (FDERIVES (i), derives[j - ntokens][k]->number);
 
   if (trace_flag & trace_sets)
     print_fderives ();
@@ -180,9 +180,9 @@ set_fderives (void)
 \f
 
 void
-new_closure (int n)
+new_closure (unsigned int n)
 {
-  itemset = XCALLOC (item_number, n);
+  itemset = xnmalloc (n, sizeof *itemset);
 
   ruleset = bitset_create (nrules, BITSET_FIXED);
 
@@ -192,10 +192,10 @@ new_closure (int n)
 
 
 void
-closure (item_number *core, int n)
+closure (item_number *core, size_t n)
 {
   /* Index over CORE. */
-  int c;
+  size_t c;
 
   /* A bit index over RULESET. */
   rule_number ruleno;
@@ -211,37 +211,39 @@ closure (item_number *core, int n)
     if (ISVAR (ritem[core[c]]))
       bitset_or (ruleset, ruleset, FDERIVES (ritem[core[c]]));
 
-  nritemset = 0;
+  /* core is sorted on item index in ritem, which is sorted on rule number.
+     Compute itemset with the same sort.  */
+  nitemset = 0;
   c = 0;
   BITSET_FOR_EACH (iter, ruleset, ruleno, 0)
     {
       item_number itemno = rules[ruleno].rhs - ritem;
       while (c < n && core[c] < itemno)
        {
-         itemset[nritemset] = core[c];
-         nritemset++;
+         itemset[nitemset] = core[c];
+         nitemset++;
          c++;
        }
-      itemset[nritemset] = itemno;
-      nritemset++;
+      itemset[nitemset] = itemno;
+      nitemset++;
     };
 
   while (c < n)
     {
-      itemset[nritemset] = core[c];
-      nritemset++;
+      itemset[nitemset] = core[c];
+      nitemset++;
       c++;
     }
 
   if (trace_flag & trace_sets)
-    print_closure ("output", itemset, nritemset);
+    print_closure ("output", itemset, nitemset);
 }
 
 
 void
 free_closure (void)
 {
-  XFREE (itemset);
+  free (itemset);
   bitset_free (ruleset);
   bitsetv_free (fderives);
 }