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[bison.git] / lib / abitset.c

diff --git a/lib/abitset.c b/lib/abitset.c
index 99c1c2f107d76a822926ed1aa0c17595da2440c2..b03ff1208aae82bc390df758815f8d8c3ea76319 100644 (file)
--- a/lib/abitset.c
+++ b/lib/abitset.c
@@ -1,10 +1,10 @@
 /* Array bitsets.
-   Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+   Copyright (C) 2002, 2003, 2006 Free Software Foundation, Inc.
    Contributed by Michael Hayes (m.hayes@elec.canterbury.ac.nz).
 
-   This program 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 of the License, or
+   the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
@@ -13,13 +13,9 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; 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/>.  */
 
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+#include <config.h>
 
 #include "abitset.h"
 #include <stddef.h>
@@ -31,16 +27,17 @@
 
 #define ABITSET_N_WORDS(N) (((N) + BITSET_WORD_BITS - 1) / BITSET_WORD_BITS)
 #define ABITSET_WORDS(X) ((X)->a.words)
-#define ABITSET_N_BITS(X) ((X)->a.n_bits)
 
 
-/* Return size in bits of bitset SRC.  */
 static bitset_bindex
-abitset_size (bitset src)
+abitset_resize (bitset src, bitset_bindex size)
 {
-  return ABITSET_N_BITS (src);
-}
+    /* These bitsets have a fixed size.  */
+    if (BITSET_SIZE_ (src) != size)
+      abort ();
 
+    return size;
+}
 
 /* Find list of up to NUM bits set in BSET starting from and including
  *NEXT and store in array LIST.  Return with actual number of bits
@@ -60,7 +57,7 @@ abitset_small_list (bitset src, bitset_bindex *list,
   if (!word)
     return 0;
 
-  size = ABITSET_N_BITS (src);
+  size = BITSET_SIZE_ (src);
   bitno = *next;
   if (bitno >= size)
     return 0;
@@ -105,8 +102,9 @@ abitset_small_list (bitset src, bitset_bindex *list,
 static void
 abitset_set (bitset dst ATTRIBUTE_UNUSED, bitset_bindex bitno ATTRIBUTE_UNUSED)
 {
-  /* This should never occur for abitsets since we should always
-     hit the cache.  */
+  /* This should never occur for abitsets since we should always hit
+     the cache.  It is likely someone is trying to access outside the
+     bounds of the bitset.  */
   abort ();
 }
 
@@ -116,9 +114,9 @@ static void
 abitset_reset (bitset dst ATTRIBUTE_UNUSED,
               bitset_bindex bitno ATTRIBUTE_UNUSED)
 {
-  /* This should never occur for abitsets since we should always
-     hit the cache.  */
-  abort ();
+  /* This should never occur for abitsets since we should always hit
+     the cache.  It is likely someone is trying to access outside the
+     bounds of the bitset.  Since the bit is zero anyway, let it pass.  */
 }
 
 
@@ -129,7 +127,6 @@ abitset_test (bitset src ATTRIBUTE_UNUSED,
 {
   /* This should never occur for abitsets since we should always
      hit the cache.  */
-  abort ();
   return false;
 }
 
@@ -149,7 +146,7 @@ abitset_list_reverse (bitset src, bitset_bindex *list,
   unsigned int bitcnt;
   bitset_bindex bitoff;
   bitset_word *srcp = ABITSET_WORDS (src);
-  bitset_bindex n_bits = ABITSET_N_BITS (src);
+  bitset_bindex n_bits = BITSET_SIZE_ (src);
 
   rbitno = *next;
 
@@ -228,7 +225,7 @@ abitset_list (bitset src, bitset_bindex *list,
     }
   else
     {
-      if (bitno >= ABITSET_N_BITS (src))
+      if (bitno >= BITSET_SIZE_ (src))
        return 0;
 
       windex = bitno / BITSET_WORD_BITS;
@@ -304,7 +301,7 @@ abitset_unused_clear (bitset dst)
 {
   unsigned int last_bit;
 
-  last_bit = ABITSET_N_BITS (dst) % BITSET_WORD_BITS;
+  last_bit = BITSET_SIZE_ (dst) % BITSET_WORD_BITS;
   if (last_bit)
     ABITSET_WORDS (dst)[dst->b.csize - 1] &=
       ((bitset_word) 1 << last_bit) - 1;
@@ -711,7 +708,8 @@ struct bitset_vtable abitset_small_vtable = {
   abitset_reset,
   bitset_toggle_,
   abitset_test,
-  abitset_size,
+  abitset_resize,
+  bitset_size_,
   bitset_count_,
   abitset_empty_p,
   abitset_ones,
@@ -748,7 +746,8 @@ struct bitset_vtable abitset_vtable = {
   abitset_reset,
   bitset_toggle_,
   abitset_test,
-  abitset_size,
+  abitset_resize,
+  bitset_size_,
   bitset_count_,
   abitset_empty_p,
   abitset_ones,
@@ -809,7 +808,7 @@ abitset_init (bitset bset, bitset_bindex n_bits)
   bitset_windex size;
 
   size = ABITSET_N_WORDS (n_bits);
-  ABITSET_N_BITS (bset) = n_bits;
+  BITSET_NBITS_ (bset) = n_bits;
 
   /* Use optimized routines if bitset fits within a single word.
      There is probably little merit if using caching since