X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/d6eba4239f3ba24daba6aff6974df8e1d61aa22e..3eb4f1a3e62807125a815dc572da9204b5b51865:/lib/abitset.c

diff --git a/lib/abitset.c b/lib/abitset.c
index f3c32ef4..be96862e 100644
--- a/lib/abitset.c
+++ b/lib/abitset.c
@@ -1,10 +1,13 @@
 /* Array bitsets.
-   Copyright (C) 2002 Free Software Foundation, Inc.
+
+   Copyright (C) 2002-2003, 2006, 2009-2012 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,
@@ -13,77 +16,38 @@
    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>
 #include <stdlib.h>
 #include <string.h>
 
 /* This file implements fixed size bitsets stored as an array
    of words.  Any unused bits in the last word must be zero.  */
 
-typedef struct abitset_struct
-{
-  unsigned int n_bits;	/* Number of bits.  */
-  bitset_word words[1];	/* The array of bits.  */
-}
-*abitset;
-
-
-struct bitset_struct
-{
-  struct bbitset_struct b;
-  struct abitset_struct a;
-};
-
-static void abitset_unused_clear PARAMS ((bitset));
-
-static int abitset_small_list PARAMS ((bitset, bitset_bindex *, bitset_bindex,
-				       bitset_bindex *));
-
-static void abitset_set PARAMS ((bitset, bitset_bindex));
-static void abitset_reset PARAMS ((bitset, bitset_bindex));
-static int abitset_test PARAMS ((bitset, bitset_bindex));
-static int abitset_size PARAMS ((bitset));
-static int abitset_op1 PARAMS ((bitset, enum bitset_ops));
-static int abitset_op2 PARAMS ((bitset, bitset, enum bitset_ops));
-static int abitset_op3 PARAMS ((bitset, bitset, bitset, enum bitset_ops));
-static int abitset_op4 PARAMS ((bitset, bitset, bitset, bitset,
-				enum bitset_ops));
-static int abitset_list PARAMS ((bitset, bitset_bindex *, bitset_bindex,
-				 bitset_bindex *));
-static int abitset_reverse_list
-PARAMS ((bitset, bitset_bindex *, bitset_bindex, bitset_bindex *));
-
 #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 int
-abitset_size (src)
-     bitset src;
+static bitset_bindex
+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
  found and with *NEXT indicating where search stopped.  */
-static int
-abitset_small_list (src, list, num, next)
-     bitset src;
-     bitset_bindex *list;
-     bitset_bindex num;
-     bitset_bindex *next;
+static bitset_bindex
+abitset_small_list (bitset src, bitset_bindex *list,
+                    bitset_bindex num, bitset_bindex *next)
 {
   bitset_bindex bitno;
   bitset_bindex count;
@@ -96,7 +60,7 @@ abitset_small_list (src, list, num, next)
   if (!word)
     return 0;
 
-  size = ABITSET_N_BITS (src);
+  size = BITSET_SIZE_ (src);
   bitno = *next;
   if (bitno >= size)
     return 0;
@@ -109,27 +73,27 @@ abitset_small_list (src, list, num, next)
   if (num >= BITSET_WORD_BITS)
     {
       for (count = 0; word; bitno++)
-	{
-	  if (word & 1)
-	    list[count++] = bitno;
-	  word >>= 1;
-	}
+        {
+          if (word & 1)
+            list[count++] = bitno;
+          word >>= 1;
+        }
     }
   else
     {
       for (count = 0; word; bitno++)
-	{
-	  if (word & 1)
-	    {
-	      list[count++] = bitno;
-	      if (count >= num)
-		{
-		  bitno++;
-		  break;
-		}
-	    }
-	  word >>= 1;
-	}
+        {
+          if (word & 1)
+            {
+              list[count++] = bitno;
+              if (count >= num)
+                {
+                  bitno++;
+                  break;
+                }
+            }
+          word >>= 1;
+        }
     }
 
   *next = bitno;
@@ -139,35 +103,34 @@ abitset_small_list (src, list, num, next)
 
 /* Set bit BITNO in bitset DST.  */
 static void
-abitset_set (dst, bitno)
-     bitset dst ATTRIBUTE_UNUSED;
-     bitset_bindex bitno ATTRIBUTE_UNUSED;
+abitset_set (bitset dst ATTRIBUTE_UNUSED, bitset_bindex bitno ATTRIBUTE_UNUSED)
 {
-  /* This should never occur for abitsets.  */
+  /* 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 ();
 }
 
 
 /* Reset bit BITNO in bitset DST.  */
 static void
-abitset_reset (dst, bitno)
-     bitset dst ATTRIBUTE_UNUSED;
-     bitset_bindex bitno ATTRIBUTE_UNUSED;
+abitset_reset (bitset dst ATTRIBUTE_UNUSED,
+               bitset_bindex bitno ATTRIBUTE_UNUSED)
 {
-  /* This should never occur for abitsets.  */
-  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.  */
 }
 
 
 /* Test bit BITNO in bitset SRC.  */
-static int
-abitset_test (src, bitno)
-     bitset src ATTRIBUTE_UNUSED;
-     bitset_bindex bitno ATTRIBUTE_UNUSED;
+static bool
+abitset_test (bitset src ATTRIBUTE_UNUSED,
+              bitset_bindex bitno ATTRIBUTE_UNUSED)
 {
-  /* This should never occur for abitsets.  */
-  abort ();
-  return 0;
+  /* This should never occur for abitsets since we should always
+     hit the cache.  */
+  return false;
 }
 
 
@@ -175,12 +138,9 @@ abitset_test (src, bitno)
    from and including NEXT and store in array LIST.  Return with
    actual number of bits found and with *NEXT indicating where search
    stopped.  */
-static int
-abitset_reverse_list (src, list, num, next)
-     bitset src;
-     bitset_bindex *list;
-     bitset_bindex num;
-     bitset_bindex *next;
+static bitset_bindex
+abitset_list_reverse (bitset src, bitset_bindex *list,
+                      bitset_bindex num, bitset_bindex *next)
 {
   bitset_bindex bitno;
   bitset_bindex rbitno;
@@ -188,9 +148,8 @@ abitset_reverse_list (src, list, num, next)
   bitset_windex windex;
   unsigned int bitcnt;
   bitset_bindex bitoff;
-  bitset_word word;
   bitset_word *srcp = ABITSET_WORDS (src);
-  bitset_bindex n_bits = ABITSET_N_BITS (src);
+  bitset_bindex n_bits = BITSET_SIZE_ (src);
 
   rbitno = *next;
 
@@ -210,20 +169,22 @@ abitset_reverse_list (src, list, num, next)
 
   do
     {
+      bitset_word word;
+
       word = srcp[windex] << (BITSET_WORD_BITS - 1 - bitcnt);
       for (; word; bitcnt--)
-	{
-	  if (word & BITSET_MSB)
-	    {
-	      list[count++] = bitoff + bitcnt;
-	      if (count >= num)
-		{
-		  *next = n_bits - (bitoff + bitcnt);
-		  return count;
-		}
-	    }
-	  word <<= 1;
-	}
+        {
+          if (word & BITSET_MSB)
+            {
+              list[count++] = bitoff + bitcnt;
+              if (count >= num)
+                {
+                  *next = n_bits - (bitoff + bitcnt);
+                  return count;
+                }
+            }
+          word <<= 1;
+        }
       bitoff -= BITSET_WORD_BITS;
       bitcnt = BITSET_WORD_BITS - 1;
     }
@@ -237,12 +198,9 @@ abitset_reverse_list (src, list, num, next)
 /* 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
  found and with *NEXT indicating where search stopped.  */
-static int
-abitset_list (src, list, num, next)
-     bitset src;
-     bitset_bindex *list;
-     bitset_bindex num;
-     bitset_bindex *next;
+static bitset_bindex
+abitset_list (bitset src, bitset_bindex *list,
+              bitset_bindex num, bitset_bindex *next)
 {
   bitset_bindex bitno;
   bitset_bindex count;
@@ -259,80 +217,80 @@ abitset_list (src, list, num, next)
     {
       /* Many bitsets are zero, so make this common case fast.  */
       for (windex = 0; windex < size && !srcp[windex]; windex++)
-	continue;
+        continue;
       if (windex >= size)
-	return 0;
+        return 0;
 
       /* If num is 1, we could speed things up with a binary search
-	 of the current word.  */
+         of the current word.  */
 
       bitoff = windex * BITSET_WORD_BITS;
     }
   else
     {
-      if (bitno >= ABITSET_N_BITS (src))
-	return 0;
+      if (bitno >= BITSET_SIZE_ (src))
+        return 0;
 
       windex = bitno / BITSET_WORD_BITS;
       bitno = bitno % BITSET_WORD_BITS;
 
       if (bitno)
-	{
-	  /* Handle the case where we start within a word.
-	     Most often, this is executed with large bitsets
-	     with many set bits where we filled the array
-	     on the previous call to this function.  */
-
-	  bitoff = windex * BITSET_WORD_BITS;
-	  word = srcp[windex] >> bitno;
-	  for (bitno = bitoff + bitno; word; bitno++)
-	    {
-	      if (word & 1)
-		{
-		  list[count++] = bitno;
-		  if (count >= num)
-		    {
-		      *next = bitno + 1;
-		      return count;
-		    }
-		}
-	      word >>= 1;
-	    }
-	  windex++;
-	}
+        {
+          /* Handle the case where we start within a word.
+             Most often, this is executed with large bitsets
+             with many set bits where we filled the array
+             on the previous call to this function.  */
+
+          bitoff = windex * BITSET_WORD_BITS;
+          word = srcp[windex] >> bitno;
+          for (bitno = bitoff + bitno; word; bitno++)
+            {
+              if (word & 1)
+                {
+                  list[count++] = bitno;
+                  if (count >= num)
+                    {
+                      *next = bitno + 1;
+                      return count;
+                    }
+                }
+              word >>= 1;
+            }
+          windex++;
+        }
       bitoff = windex * BITSET_WORD_BITS;
     }
 
   for (; windex < size; windex++, bitoff += BITSET_WORD_BITS)
     {
       if (!(word = srcp[windex]))
-	continue;
+        continue;
 
       if ((count + BITSET_WORD_BITS) < num)
-	{
-	  for (bitno = bitoff; word; bitno++)
-	    {
-	      if (word & 1)
-		list[count++] = bitno;
-	      word >>= 1;
-	    }
-	}
+        {
+          for (bitno = bitoff; word; bitno++)
+            {
+              if (word & 1)
+                list[count++] = bitno;
+              word >>= 1;
+            }
+        }
       else
-	{
-	  for (bitno = bitoff; word; bitno++)
-	    {
-	      if (word & 1)
-		{
-		  list[count++] = bitno;
-		  if (count >= num)
-		    {
-		      *next = bitno + 1;
-		      return count;
-		    }
-		}
-	      word >>= 1;
-	    }
-	}
+        {
+          for (bitno = bitoff; word; bitno++)
+            {
+              if (word & 1)
+                {
+                  list[count++] = bitno;
+                  if (count >= num)
+                    {
+                      *next = bitno + 1;
+                      return count;
+                    }
+                }
+              word >>= 1;
+            }
+        }
     }
 
   *next = bitoff;
@@ -342,309 +300,526 @@ abitset_list (src, list, num, next)
 
 /* Ensure that any unused bits within the last word are clear.  */
 static inline void
-abitset_unused_clear (dst)
-     bitset dst;
+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;
 }
 
 
-static int
-abitset_op1 (dst, op)
-     bitset dst;
-     enum bitset_ops op;
+static void
+abitset_ones (bitset dst)
+{
+  bitset_word *dstp = ABITSET_WORDS (dst);
+  size_t bytes;
+
+  bytes = sizeof (bitset_word) * dst->b.csize;
+
+  memset (dstp, -1, bytes);
+  abitset_unused_clear (dst);
+}
+
+
+static void
+abitset_zero (bitset dst)
 {
-  unsigned int i;
   bitset_word *dstp = ABITSET_WORDS (dst);
-  unsigned int bytes;
+  size_t bytes;
 
   bytes = sizeof (bitset_word) * dst->b.csize;
 
-  switch (op)
+  memset (dstp, 0, bytes);
+}
+
+
+static bool
+abitset_empty_p (bitset dst)
+{
+  bitset_windex i;
+  bitset_word *dstp = ABITSET_WORDS (dst);
+
+  for (i = 0; i < dst->b.csize; i++)
+    if (dstp[i])
+      return false;
+
+  return true;
+}
+
+
+static void
+abitset_copy1 (bitset dst, bitset src)
+{
+  bitset_word *srcp = ABITSET_WORDS (src);
+  bitset_word *dstp = ABITSET_WORDS (dst);
+  bitset_windex size = dst->b.csize;
+
+  if (srcp == dstp)
+      return;
+  memcpy (dstp, srcp, sizeof (bitset_word) * size);
+}
+
+
+static void
+abitset_not (bitset dst, bitset src)
+{
+  bitset_windex i;
+  bitset_word *srcp = ABITSET_WORDS (src);
+  bitset_word *dstp = ABITSET_WORDS (dst);
+  bitset_windex size = dst->b.csize;
+
+  for (i = 0; i < size; i++)
+      *dstp++ = ~(*srcp++);
+  abitset_unused_clear (dst);
+}
+
+
+static bool
+abitset_equal_p (bitset dst, bitset src)
+{
+  bitset_windex i;
+  bitset_word *srcp = ABITSET_WORDS (src);
+  bitset_word *dstp = ABITSET_WORDS (dst);
+  bitset_windex size = dst->b.csize;
+
+  for (i = 0; i < size; i++)
+      if (*srcp++ != *dstp++)
+          return false;
+  return true;
+}
+
+
+static bool
+abitset_subset_p (bitset dst, bitset src)
+{
+  bitset_windex i;
+  bitset_word *srcp = ABITSET_WORDS (src);
+  bitset_word *dstp = ABITSET_WORDS (dst);
+  bitset_windex size = dst->b.csize;
+
+  for (i = 0; i < size; i++, dstp++, srcp++)
+      if (*dstp != (*srcp | *dstp))
+          return false;
+  return true;
+}
+
+
+static bool
+abitset_disjoint_p (bitset dst, bitset src)
+{
+  bitset_windex i;
+  bitset_word *srcp = ABITSET_WORDS (src);
+  bitset_word *dstp = ABITSET_WORDS (dst);
+  bitset_windex size = dst->b.csize;
+
+  for (i = 0; i < size; i++)
+      if (*srcp++ & *dstp++)
+          return false;
+
+  return true;
+}
+
+
+static void
+abitset_and (bitset dst, bitset src1, bitset src2)
+{
+  bitset_windex i;
+  bitset_word *src1p = ABITSET_WORDS (src1);
+  bitset_word *src2p = ABITSET_WORDS (src2);
+  bitset_word *dstp = ABITSET_WORDS (dst);
+  bitset_windex size = dst->b.csize;
+
+  for (i = 0; i < size; i++)
+      *dstp++ = *src1p++ & *src2p++;
+}
+
+
+static bool
+abitset_and_cmp (bitset dst, bitset src1, bitset src2)
+{
+  bitset_windex i;
+  bool changed = false;
+  bitset_word *src1p = ABITSET_WORDS (src1);
+  bitset_word *src2p = ABITSET_WORDS (src2);
+  bitset_word *dstp = ABITSET_WORDS (dst);
+  bitset_windex size = dst->b.csize;
+
+  for (i = 0; i < size; i++, dstp++)
     {
-    case BITSET_OP_ZERO:
-      memset (dstp, 0, bytes);
-      break;
-
-    case BITSET_OP_ONES:
-      memset (dstp, -1, bytes);
-      abitset_unused_clear (dst);
-      break;
-
-    case BITSET_OP_EMPTY_P:
-      for (i = 0; i < dst->b.csize; i++)
-	if (dstp[i])
-	  return 0;
-      break;
-
-    default:
-      abort ();
+      bitset_word tmp = *src1p++ & *src2p++;
+
+      if (*dstp != tmp)
+        {
+          changed = true;
+          *dstp = tmp;
+        }
     }
+  return changed;
+}
+
 
-  return 1;
+static void
+abitset_andn (bitset dst, bitset src1, bitset src2)
+{
+  bitset_windex i;
+  bitset_word *src1p = ABITSET_WORDS (src1);
+  bitset_word *src2p = ABITSET_WORDS (src2);
+  bitset_word *dstp = ABITSET_WORDS (dst);
+  bitset_windex size = dst->b.csize;
+
+  for (i = 0; i < size; i++)
+      *dstp++ = *src1p++ & ~(*src2p++);
 }
 
 
-static int
-abitset_op2 (dst, src, op)
-     bitset dst;
-     bitset src;
-     enum bitset_ops op;
+static bool
+abitset_andn_cmp (bitset dst, bitset src1, bitset src2)
 {
-  unsigned int i;
-  bitset_word *srcp = ABITSET_WORDS (src);
+  bitset_windex i;
+  bool changed = false;
+  bitset_word *src1p = ABITSET_WORDS (src1);
+  bitset_word *src2p = ABITSET_WORDS (src2);
   bitset_word *dstp = ABITSET_WORDS (dst);
   bitset_windex size = dst->b.csize;
 
-  switch (op)
+  for (i = 0; i < size; i++, dstp++)
     {
-    case BITSET_OP_COPY:
-      if (srcp == dstp)
-	break;
-      memcpy (dstp, srcp, sizeof (bitset_word) * size);
-      break;
-
-    case BITSET_OP_NOT:
-      for (i = 0; i < size; i++)
-	*dstp++ = ~(*srcp++);
-      abitset_unused_clear (dst);
-      break;
-
-    case BITSET_OP_EQUAL_P:
-      for (i = 0; i < size; i++)
-	if (*srcp++ != *dstp++)
-	  return 0;
-      break;
-      
-    case BITSET_OP_SUBSET_P:
-      for (i = 0; i < size; i++, dstp++, srcp++)
-	if (*dstp != (*srcp | *dstp))
-	  return 0;
-      break;
-      
-    case BITSET_OP_DISJOINT_P:
-      for (i = 0; i < size; i++)
-	if (*srcp++ & *dstp++)
-	  return 0;
-      break;
-      
-    default:
-      abort ();
+      bitset_word tmp = *src1p++ & ~(*src2p++);
+
+      if (*dstp != tmp)
+        {
+          changed = true;
+          *dstp = tmp;
+        }
     }
+  return changed;
+}
+
+
+static void
+abitset_or (bitset dst, bitset src1, bitset src2)
+{
+  bitset_windex i;
+  bitset_word *src1p = ABITSET_WORDS (src1);
+  bitset_word *src2p = ABITSET_WORDS (src2);
+  bitset_word *dstp = ABITSET_WORDS (dst);
+  bitset_windex size = dst->b.csize;
 
-  return 1;
+  for (i = 0; i < size; i++)
+      *dstp++ = *src1p++ | *src2p++;
 }
 
 
-static int
-abitset_op3 (dst, src1, src2, op)
-     bitset dst;
-     bitset src1;
-     bitset src2;
-     enum bitset_ops op;
+static bool
+abitset_or_cmp (bitset dst, bitset src1, bitset src2)
 {
-  unsigned int i;
-  int changed = 0;
+  bitset_windex i;
+  bool changed = false;
   bitset_word *src1p = ABITSET_WORDS (src1);
   bitset_word *src2p = ABITSET_WORDS (src2);
   bitset_word *dstp = ABITSET_WORDS (dst);
   bitset_windex size = dst->b.csize;
 
-  switch (op)
+  for (i = 0; i < size; i++, dstp++)
     {
-    case BITSET_OP_OR:
-      for (i = 0; i < size; i++, dstp++)
-	{
-	  bitset_word tmp = *src1p++ | *src2p++;
-
-	  if (*dstp != tmp)
-	    {
-	      changed = 1;
-	      *dstp = tmp;
-	    }
-	}
-      break;
-
-    case BITSET_OP_AND:
-      for (i = 0; i < size; i++, dstp++)
-	{
-	  bitset_word tmp = *src1p++ & *src2p++;
-
-	  if (*dstp != tmp)
-	    {
-	      changed = 1;
-	      *dstp = tmp;
-	    }
-	}
-      break;
-
-    case BITSET_OP_XOR:
-      for (i = 0; i < size; i++, dstp++)
-	{
-	  bitset_word tmp = *src1p++ ^ *src2p++;
-
-	  if (*dstp != tmp)
-	    {
-	      changed = 1;
-	      *dstp = tmp;
-	    }
-	}
-      break;
-
-    case BITSET_OP_ANDN:
-      for (i = 0; i < size; i++, dstp++)
-	{
-	  bitset_word tmp = *src1p++ & ~(*src2p++);
-
-	  if (*dstp != tmp)
-	    {
-	      changed = 1;
-	      *dstp = tmp;
-	    }
-	}
-      break;
-
-    default:
-      abort ();
+      bitset_word tmp = *src1p++ | *src2p++;
+
+      if (*dstp != tmp)
+        {
+          changed = true;
+          *dstp = tmp;
+        }
     }
+  return changed;
+}
+
+
+static void
+abitset_xor (bitset dst, bitset src1, bitset src2)
+{
+  bitset_windex i;
+  bitset_word *src1p = ABITSET_WORDS (src1);
+  bitset_word *src2p = ABITSET_WORDS (src2);
+  bitset_word *dstp = ABITSET_WORDS (dst);
+  bitset_windex size = dst->b.csize;
+
+  for (i = 0; i < size; i++)
+      *dstp++ = *src1p++ ^ *src2p++;
+}
+
 
+static bool
+abitset_xor_cmp (bitset dst, bitset src1, bitset src2)
+{
+  bitset_windex i;
+  bool changed = false;
+  bitset_word *src1p = ABITSET_WORDS (src1);
+  bitset_word *src2p = ABITSET_WORDS (src2);
+  bitset_word *dstp = ABITSET_WORDS (dst);
+  bitset_windex size = dst->b.csize;
+
+  for (i = 0; i < size; i++, dstp++)
+    {
+      bitset_word tmp = *src1p++ ^ *src2p++;
+
+      if (*dstp != tmp)
+        {
+          changed = true;
+          *dstp = tmp;
+        }
+    }
   return changed;
 }
 
 
-static int
-abitset_op4 (dst, src1, src2, src3, op)
-     bitset dst;
-     bitset src1;
-     bitset src2;
-     bitset src3;
-     enum bitset_ops op;
+static void
+abitset_and_or (bitset dst, bitset src1, bitset src2, bitset src3)
 {
-  unsigned int i;
-  int changed = 0;
+  bitset_windex i;
   bitset_word *src1p = ABITSET_WORDS (src1);
   bitset_word *src2p = ABITSET_WORDS (src2);
   bitset_word *src3p = ABITSET_WORDS (src3);
   bitset_word *dstp = ABITSET_WORDS (dst);
   bitset_windex size = dst->b.csize;
 
-  switch (op)
+  for (i = 0; i < size; i++)
+      *dstp++ = (*src1p++ & *src2p++) | *src3p++;
+}
+
+
+static bool
+abitset_and_or_cmp (bitset dst, bitset src1, bitset src2, bitset src3)
+{
+  bitset_windex i;
+  bool changed = false;
+  bitset_word *src1p = ABITSET_WORDS (src1);
+  bitset_word *src2p = ABITSET_WORDS (src2);
+  bitset_word *src3p = ABITSET_WORDS (src3);
+  bitset_word *dstp = ABITSET_WORDS (dst);
+  bitset_windex size = dst->b.csize;
+
+  for (i = 0; i < size; i++, dstp++)
     {
-    case BITSET_OP_OR_AND:
-      for (i = 0; i < size; i++, dstp++)
-	{
-	  bitset_word tmp = (*src1p++ | *src2p++) & *src3p++;
-
-	  if (*dstp != tmp)
-	    {
-	      changed = 1;
-	      *dstp = tmp;
-	    }
-	}
-      break;
-
-    case BITSET_OP_AND_OR:
-      for (i = 0; i < size; i++, dstp++)
-	{
-	  bitset_word tmp = (*src1p++ & *src2p++) | *src3p++;
-
-	  if (*dstp != tmp)
-	    {
-	      changed = 1;
-	      *dstp = tmp;
-	    }
-	}
-      break;
-
-    case BITSET_OP_ANDN_OR:
-      for (i = 0; i < size; i++, dstp++)
-	{
-	  bitset_word tmp = (*src1p++ & ~(*src2p++)) | *src3p++;
-
-	  if (*dstp != tmp)
-	    {
-	      changed = 1;
-	      *dstp = tmp;
-	    }
-	}
-      break;
-
-    default:
-      abort ();
+      bitset_word tmp = (*src1p++ & *src2p++) | *src3p++;
+
+      if (*dstp != tmp)
+        {
+          changed = true;
+          *dstp = tmp;
+        }
+    }
+  return changed;
+}
+
+
+static void
+abitset_andn_or (bitset dst, bitset src1, bitset src2, bitset src3)
+{
+  bitset_windex i;
+  bitset_word *src1p = ABITSET_WORDS (src1);
+  bitset_word *src2p = ABITSET_WORDS (src2);
+  bitset_word *src3p = ABITSET_WORDS (src3);
+  bitset_word *dstp = ABITSET_WORDS (dst);
+  bitset_windex size = dst->b.csize;
+
+  for (i = 0; i < size; i++)
+      *dstp++ = (*src1p++ & ~(*src2p++)) | *src3p++;
+}
+
+
+static bool
+abitset_andn_or_cmp (bitset dst, bitset src1, bitset src2, bitset src3)
+{
+  bitset_windex i;
+  bool changed = false;
+  bitset_word *src1p = ABITSET_WORDS (src1);
+  bitset_word *src2p = ABITSET_WORDS (src2);
+  bitset_word *src3p = ABITSET_WORDS (src3);
+  bitset_word *dstp = ABITSET_WORDS (dst);
+  bitset_windex size = dst->b.csize;
+
+  for (i = 0; i < size; i++, dstp++)
+    {
+      bitset_word tmp = (*src1p++ & ~(*src2p++)) | *src3p++;
+
+      if (*dstp != tmp)
+        {
+          changed = true;
+          *dstp = tmp;
+        }
     }
+  return changed;
+}
+
 
+static void
+abitset_or_and (bitset dst, bitset src1, bitset src2, bitset src3)
+{
+  bitset_windex i;
+  bitset_word *src1p = ABITSET_WORDS (src1);
+  bitset_word *src2p = ABITSET_WORDS (src2);
+  bitset_word *src3p = ABITSET_WORDS (src3);
+  bitset_word *dstp = ABITSET_WORDS (dst);
+  bitset_windex size = dst->b.csize;
+
+  for (i = 0; i < size; i++)
+      *dstp++ = (*src1p++ | *src2p++) & *src3p++;
+}
+
+
+static bool
+abitset_or_and_cmp (bitset dst, bitset src1, bitset src2, bitset src3)
+{
+  bitset_windex i;
+  bool changed = false;
+  bitset_word *src1p = ABITSET_WORDS (src1);
+  bitset_word *src2p = ABITSET_WORDS (src2);
+  bitset_word *src3p = ABITSET_WORDS (src3);
+  bitset_word *dstp = ABITSET_WORDS (dst);
+  bitset_windex size = dst->b.csize;
+
+  for (i = 0; i < size; i++, dstp++)
+    {
+      bitset_word tmp = (*src1p++ | *src2p++) & *src3p++;
+
+      if (*dstp != tmp)
+        {
+          changed = true;
+          *dstp = tmp;
+        }
+    }
   return changed;
 }
 
 
+static void
+abitset_copy (bitset dst, bitset src)
+{
+  if (BITSET_COMPATIBLE_ (dst, src))
+      abitset_copy1 (dst, src);
+  else
+      bitset_copy_ (dst, src);
+}
+
+
 /* Vector of operations for single word bitsets.  */
-struct bitset_ops_struct abitset_small_ops = {
+struct bitset_vtable abitset_small_vtable = {
   abitset_set,
   abitset_reset,
+  bitset_toggle_,
   abitset_test,
-  abitset_size,
-  abitset_op1,
-  abitset_op2,
-  abitset_op3,
-  abitset_op4,
+  abitset_resize,
+  bitset_size_,
+  bitset_count_,
+  abitset_empty_p,
+  abitset_ones,
+  abitset_zero,
+  abitset_copy,
+  abitset_disjoint_p,
+  abitset_equal_p,
+  abitset_not,
+  abitset_subset_p,
+  abitset_and,
+  abitset_and_cmp,
+  abitset_andn,
+  abitset_andn_cmp,
+  abitset_or,
+  abitset_or_cmp,
+  abitset_xor,
+  abitset_xor_cmp,
+  abitset_and_or,
+  abitset_and_or_cmp,
+  abitset_andn_or,
+  abitset_andn_or_cmp,
+  abitset_or_and,
+  abitset_or_and_cmp,
   abitset_small_list,
-  abitset_reverse_list,
+  abitset_list_reverse,
   NULL,
   BITSET_ARRAY
 };
 
 
 /* Vector of operations for multiple word bitsets.  */
-struct bitset_ops_struct abitset_ops = {
+struct bitset_vtable abitset_vtable = {
   abitset_set,
   abitset_reset,
+  bitset_toggle_,
   abitset_test,
-  abitset_size,
-  abitset_op1,
-  abitset_op2,
-  abitset_op3,
-  abitset_op4,
+  abitset_resize,
+  bitset_size_,
+  bitset_count_,
+  abitset_empty_p,
+  abitset_ones,
+  abitset_zero,
+  abitset_copy,
+  abitset_disjoint_p,
+  abitset_equal_p,
+  abitset_not,
+  abitset_subset_p,
+  abitset_and,
+  abitset_and_cmp,
+  abitset_andn,
+  abitset_andn_cmp,
+  abitset_or,
+  abitset_or_cmp,
+  abitset_xor,
+  abitset_xor_cmp,
+  abitset_and_or,
+  abitset_and_or_cmp,
+  abitset_andn_or,
+  abitset_andn_or_cmp,
+  abitset_or_and,
+  abitset_or_and_cmp,
   abitset_list,
-  abitset_reverse_list,
+  abitset_list_reverse,
   NULL,
   BITSET_ARRAY
 };
 
 
-int
-abitset_bytes (n_bits)
-     bitset_bindex n_bits;
+size_t
+abitset_bytes (bitset_bindex n_bits)
 {
-  unsigned int bytes, size;
+  bitset_windex size;
+  size_t bytes;
+  size_t header_size = offsetof (union bitset_union, a.words);
+  struct bitset_align_struct { char a; union bitset_union b; };
+  size_t bitset_alignment = offsetof (struct bitset_align_struct, b);
 
   size = ABITSET_N_WORDS (n_bits);
-  bytes = size * sizeof (bitset_word);
-  return sizeof (struct bitset_struct) + bytes - sizeof (bitset_word);
+  bytes = header_size + size * sizeof (bitset_word);
+
+  /* Align the size properly for a vector of abitset objects.  */
+  if (header_size % bitset_alignment != 0
+      || sizeof (bitset_word) % bitset_alignment != 0)
+    {
+      bytes += bitset_alignment - 1;
+      bytes -= bytes % bitset_alignment;
+    }
+
+  return bytes;
 }
 
 
 bitset
-abitset_init (bset, n_bits)
-     bitset bset;
-     bitset_bindex n_bits;
+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
      the small bitset will always fit in the cache.  */
   if (size == 1)
-    bset->b.ops = &abitset_small_ops;
+    bset->b.vtable = &abitset_small_vtable;
   else
-    bset->b.ops = &abitset_ops;
+    bset->b.vtable = &abitset_vtable;
 
   bset->b.cindex = 0;
   bset->b.csize = size;