X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/2f4f028d8bb527ebdab2476f76aac58f07f5b767..0fe9720964da510a2b359af390a3053aace65f9f:/src/closure.c

diff --git a/src/closure.c b/src/closure.c
index eb53ee05..4719c419 100644
--- a/src/closure.c
+++ b/src/closure.c
@@ -1,31 +1,29 @@
 /* Closures for Bison
 
-   Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004 Free Software
-   Foundation, Inc.
+   Copyright (C) 1984, 1989, 2000-2002, 2004-2005, 2007, 2009-2012 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., 51 Franklin Street, Fifth Floor, Boston, MA
-   02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
+#include <config.h>
 #include "system.h"
 
 #include <bitset.h>
 #include <bitsetv-print.h>
 #include <bitsetv.h>
-#include <quotearg.h>
 
 #include "closure.h"
 #include "derives.h"
@@ -36,7 +34,7 @@
 
 /* NITEMSET is the size of the array ITEMSET.  */
 item_number *itemset;
-size_t nritemset;
+size_t nitemset;
 
 static bitset ruleset;
 
@@ -46,7 +44,7 @@ static bitsetv firsts = NULL;
 
 /* Retrieve the FDERIVES/FIRSTS sets of the nonterminals numbered Var.  */
 #define FDERIVES(Var)   fderives[(Var) - ntokens]
-#define   FIRSTS(Var)   firsts[(Var) - ntokens]
+#define FIRSTS(Var)   firsts[(Var) - ntokens]
 
 
 /*-----------------.
@@ -63,7 +61,7 @@ print_closure (char const *title, item_number *array, size_t size)
       item_number *rp;
       fprintf (stderr, "  %2d: .", array[i]);
       for (rp = &ritem[array[i]]; *rp >= 0; ++rp)
-	fprintf (stderr, " %s", symbols[*rp]->tag);
+        fprintf (stderr, " %s", symbols[*rp]->tag);
       fprintf (stderr, "  (rule %d)\n", -*rp - 1);
     }
   fputs ("\n\n", stderr);
@@ -79,12 +77,9 @@ print_firsts (void)
   for (i = ntokens; i < nsyms; i++)
     {
       bitset_iterator iter;
-      fprintf (stderr, "\t%s firsts\n", symbols[i]->tag);
+      fprintf (stderr, "  %s firsts\n", symbols[i]->tag);
       BITSET_FOR_EACH (iter, FIRSTS (i), j, 0)
-	{
-	  fprintf (stderr, "\t\t%s\n",
-		   symbols[j + ntokens]->tag);
-	}
+        fprintf (stderr, "    %s\n", symbols[j + ntokens]->tag);
     }
   fprintf (stderr, "\n\n");
 }
@@ -100,12 +95,13 @@ print_fderives (void)
   for (i = ntokens; i < nsyms; i++)
     {
       bitset_iterator iter;
-      fprintf (stderr, "\t%s derives\n", symbols[i]->tag);
+      fprintf (stderr, "  %s derives\n", symbols[i]->tag);
       BITSET_FOR_EACH (iter, FDERIVES (i), r, 0)
-	{
-	  fprintf (stderr, "\t\t%3d ", r);
-	  rule_rhs_print (&rules[r], stderr);
-	}
+        {
+          fprintf (stderr, "    %3d ", r);
+          rule_rhs_print (&rules[r], stderr);
+          fprintf (stderr, "\n");
+        }
     }
   fprintf (stderr, "\n\n");
 }
@@ -131,9 +127,9 @@ set_firsts (void)
   for (i = ntokens; i < nsyms; i++)
     for (j = 0; derives[i - ntokens][j]; ++j)
       {
-	item_number sym = derives[i - ntokens][j]->rhs[0];
-	if (ISVAR (sym))
-	  bitset_set (FIRSTS (i), sym - ntokens);
+        item_number sym = derives[i - ntokens][j]->rhs[0];
+        if (ISVAR (sym))
+          bitset_set (FIRSTS (i), sym - ntokens);
       }
 
   if (trace_flag & trace_sets)
@@ -169,8 +165,8 @@ 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 - ntokens][k]; ++k)
-	  bitset_set (FDERIVES (i), derives[j - ntokens][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 ();
@@ -212,30 +208,32 @@ closure (item_number *core, size_t 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++;
-	  c++;
-	}
-      itemset[nritemset] = itemno;
-      nritemset++;
+        {
+          itemset[nitemset] = core[c];
+          nitemset++;
+          c++;
+        }
+      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);
 }