X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/613f5e1a895b0742c9b6c5e9461e4cf3f7389d7e..e8b1fb9b991d72f290e69aaeb5a2b58caa8b5349:/src/closure.c

diff --git a/src/closure.c b/src/closure.c
index 02d275a7..ff3109ca 100644
--- a/src/closure.c
+++ b/src/closure.c
@@ -1,38 +1,41 @@
-/* Subroutines for bison
-   Copyright (C) 1984, 1989, 2000, 2001, 2002 Free Software Foundation, Inc.
+/* Closures for Bison
+
+   Copyright (C) 1984, 1989, 2000, 2001, 2002, 2004, 2005, 2007 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 "quotearg.h"
-#include "bitset.h"
-#include "bitsetv.h"
-#include "bitsetv-print.h"
+
+#include <bitset.h>
+#include <bitsetv-print.h>
+#include <bitsetv.h>
+#include <quotearg.h>
+
+#include "closure.h"
+#include "derives.h"
 #include "getargs.h"
-#include "symtab.h"
 #include "gram.h"
 #include "reader.h"
-#include "closure.h"
-#include "derives.h"
+#include "symtab.h"
 
 /* NITEMSET is the size of the array ITEMSET.  */
-item_number_t *itemset;
-int nritemset;
+item_number *itemset;
+size_t nitemset;
 
 static bitset ruleset;
 
@@ -50,13 +53,13 @@ static bitsetv firsts = NULL;
 `-----------------*/
 
 static void
-print_closure (const char *title, item_number_t *array, size_t size)
+print_closure (char const *title, item_number *array, size_t size)
 {
   size_t i;
   fprintf (stderr, "Closure: %s\n", title);
   for (i = 0; i < size; ++i)
     {
-      item_number_t *rp;
+      item_number *rp;
       fprintf (stderr, "  %2d: .", array[i]);
       for (rp = &ritem[array[i]]; *rp >= 0; ++rp)
 	fprintf (stderr, " %s", symbols[*rp]->tag);
@@ -69,7 +72,7 @@ print_closure (const char *title, item_number_t *array, size_t size)
 static void
 print_firsts (void)
 {
-  symbol_number_t i, j;
+  symbol_number i, j;
 
   fprintf (stderr, "FIRSTS\n");
   for (i = ntokens; i < nsyms; i++)
@@ -90,7 +93,7 @@ static void
 print_fderives (void)
 {
   int i;
-  rule_number_t r;
+  rule_number r;
 
   fprintf (stderr, "FDERIVES\n");
   for (i = ntokens; i < nsyms; i++)
@@ -99,11 +102,8 @@ print_fderives (void)
       fprintf (stderr, "\t%s derives\n", symbols[i]->tag);
       BITSET_FOR_EACH (iter, FDERIVES (i), r, 0)
 	{
-	  item_number_t *rhsp = NULL;
-	  fprintf (stderr, "\t\t%d:", r - 1);
-	  for (rhsp = rules[r].rhs; *rhsp >= 0; ++rhsp)
-	    fprintf (stderr, " %s", symbols[*rhsp]->tag);
-	  fputc ('\n', stderr);
+	  fprintf (stderr, "\t\t%3d ", r);
+	  rule_rhs_print (&rules[r], stderr);
 	}
     }
   fprintf (stderr, "\n\n");
@@ -123,25 +123,25 @@ print_fderives (void)
 static void
 set_firsts (void)
 {
-  symbol_number_t i, j;
+  symbol_number i, j;
 
   firsts = bitsetv_create (nvars, nvars, BITSET_FIXED);
 
   for (i = ntokens; i < nsyms; i++)
-    for (j = 0; derives[i][j] >= 0; ++j)
+    for (j = 0; derives[i - ntokens][j]; ++j)
       {
-	int symbol = rules[derives[i][j]].rhs[0];
-	if (ISVAR (symbol))
-	  bitset_set (FIRSTS (i), symbol - ntokens);
+	item_number sym = derives[i - ntokens][j]->rhs[0];
+	if (ISVAR (sym))
+	  bitset_set (FIRSTS (i), sym - ntokens);
       }
 
-  if (trace_flag)
+  if (trace_flag & trace_sets)
     bitsetv_matrix_dump (stderr, "RTC: Firsts Input", firsts);
   bitsetv_reflexive_transitive_closure (firsts);
-  if (trace_flag)
+  if (trace_flag & trace_sets)
     bitsetv_matrix_dump (stderr, "RTC: Firsts Output", firsts);
 
-  if (trace_flag)
+  if (trace_flag & trace_sets)
     print_firsts ();
 }
 
@@ -158,20 +158,20 @@ set_firsts (void)
 static void
 set_fderives (void)
 {
-  symbol_number_t i, j;
-  rule_number_t k;
+  symbol_number i, j;
+  rule_number k;
 
-  fderives = bitsetv_create (nvars, nrules + 1, BITSET_FIXED);
+  fderives = bitsetv_create (nvars, nrules, BITSET_FIXED);
 
   set_firsts ();
 
   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] > 0; ++k)
-	  bitset_set (FDERIVES (i), derives[j][k]);
+	for (k = 0; derives[j - ntokens][k]; ++k)
+	  bitset_set (FDERIVES (i), derives[j - ntokens][k]->number);
 
-  if (trace_flag)
+  if (trace_flag & trace_sets)
     print_fderives ();
 
   bitsetv_free (firsts);
@@ -180,11 +180,11 @@ set_fderives (void)
 
 
 void
-new_closure (int n)
+new_closure (unsigned int n)
 {
-  itemset = XCALLOC (item_number_t, n);
+  itemset = xnmalloc (n, sizeof *itemset);
 
-  ruleset = bitset_create (nrules + 1, BITSET_FIXED);
+  ruleset = bitset_create (nrules, BITSET_FIXED);
 
   set_fderives ();
 }
@@ -192,17 +192,17 @@ new_closure (int n)
 
 
 void
-closure (item_number_t *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_t ruleno;
+  rule_number ruleno;
 
   bitset_iterator iter;
 
-  if (trace_flag)
+  if (trace_flag & trace_sets)
     print_closure ("input", core, n);
 
   bitset_zero (ruleset);
@@ -211,37 +211,39 @@ closure (item_number_t *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_t itemno = rules[ruleno].rhs - ritem;
+      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)
-    print_closure ("output", itemset, nritemset);
+  if (trace_flag & trace_sets)
+    print_closure ("output", itemset, nitemset);
 }
 
 
 void
 free_closure (void)
 {
-  XFREE (itemset);
+  free (itemset);
   bitset_free (ruleset);
   bitsetv_free (fderives);
 }