X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/7086e7071e8bfa2012e9134530a158c88a832ba6..4654b0c0a8a355e7a8fcdf51b1a5eb6c485126f1:/lib/bitset.h

diff --git a/lib/bitset.h b/lib/bitset.h
index 4afbbf4f..3e52940c 100644
--- a/lib/bitset.h
+++ b/lib/bitset.h
@@ -1,395 +1,391 @@
 /* Generic bitsets.
-   Copyright (C) 2002 Free Software Foundation, Inc.
+   Copyright (C) 2002, 2003, 2004 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
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, 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.
 
-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.
+   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 this program; if not, write to the Free Software
-Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #ifndef _BITSET_H
 #define _BITSET_H
 
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+/* This file is the public interface to the bitset abstract data type.
+   Only use the functions and macros defined in this file.  */
 
-#define BITSET_STATS 1
-
-# ifndef PARAMS
-#  if defined PROTOTYPES || (defined __STDC__ && __STDC__)
-#   define PARAMS(Args) Args
-#  else
-#   define PARAMS(Args) ()
-#  endif
-# endif
-
-# ifndef __attribute__
-#  if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
-#   define __attribute__(x)
-#  endif
-# endif
-
-# ifndef ATTRIBUTE_NORETURN
-#  define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
-# endif
-
-# ifndef ATTRIBUTE_UNUSED
-#  define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
-# endif
-
-#include "bitset-int.h"
-#include "sbitset.h"
-#include "lbitset.h"
-#include "ebitset.h"
+#include "bbitset.h"
 #include "obstack.h"
 #include <stdio.h>
-#include "xalloc.h"
 
+#if USE_UNLOCKED_IO
+# include "unlocked-io.h"
+#endif
+
+/* Attributes used to select a bitset implementation.  */
 enum bitset_attr {BITSET_FIXED = 1,    /* Bitset size fixed.  */
 		  BITSET_VARIABLE = 2, /* Bitset size variable.  */
 		  BITSET_DENSE = 4,    /* Bitset dense.  */
 		  BITSET_SPARSE = 8,   /* Bitset sparse.  */
 		  BITSET_FRUGAL = 16,  /* Prefer most compact.  */
-		  BITSET_GREEDY = 32}; /* Prefer fastest.  */
+		  BITSET_GREEDY = 32}; /* Prefer fastest at memory expense.  */
 
 typedef unsigned int bitset_attrs;
 
-/* The elements of these structures should be considered
-   to be private.  */
-typedef struct bitset_struct
+/* The contents of the union should be considered to be private.
+   While I would like to make this union opaque, it needs to be
+   visible for the inline bit set/test functions, and for delegation
+   to the proper implementation.  */
+union bitset_union
 {
-  struct bitset_ops_struct *ops;
-  bitset_windex cindex;		/* Cache word index.  */
-  bitset_windex csize;		/* Cache size in words.  */
-  bitset_word *cdata;		/* Cache data pointer.  */
-  union bitset_data
+  /* This must be the first member of every other structure that is a
+     member of this union.  */
+  struct bbitset_struct b;	        /* Base bitset data.  */
+
+  struct abitset_struct
+  {
+    struct bbitset_struct b;
+    bitset_word words[1];		/* The array of bits.  */
+  } a;
+
+  struct ebitset_struct
   {
-    struct sbitset_struct s;
-    struct lbitset_struct l;
-    struct ebitset_struct e;
-  } u;
-} *bitset;
+    struct bbitset_struct b;
+    bitset_windex size;			/* Number of elements.  */
+    struct ebitset_elt_struct **elts;	/* Expanding array of ptrs to elts.  */
+  } e;
 
+  struct lbitset_struct
+  {
+    struct bbitset_struct b;
+    struct lbitset_elt_struct *head;	/* First element in linked list.  */
+    struct lbitset_elt_struct *tail;	/* Last element in linked list.  */
+  } l;
+
+  struct bitset_stats_struct
+  {
+    struct bbitset_struct b;
+    bitset bset;
+  } s;
+
+  struct vbitset_struct
+  {
+    struct bbitset_struct b;
+    bitset_windex size;			/* Allocated size of array.  */
+  } v;
 
-/* The contents of this structure should be considered private.  */
-struct bitset_ops_struct
-{
-  void (*set) PARAMS ((struct bitset_struct *, bitset_bindex));
-  void (*reset) PARAMS ((struct bitset_struct *, bitset_bindex));
-  int (*test) PARAMS ((struct bitset_struct *, bitset_bindex));
-  int (*size) PARAMS ((struct bitset_struct *));
-  int (*op1) PARAMS ((struct bitset_struct *, enum bitset_ops));
-  int (*op2) PARAMS ((struct bitset_struct *, struct bitset_struct *,
-		      enum bitset_ops));
-  int (*op3) PARAMS ((struct bitset_struct *, struct bitset_struct *,
-		      struct bitset_struct *, enum bitset_ops));
-  int (*op4) PARAMS ((struct bitset_struct *, struct bitset_struct *,
-		      struct bitset_struct *, struct bitset_struct *,
-		      enum bitset_ops));
-  int (*list) PARAMS ((struct bitset_struct *, bitset_bindex *,
-		       bitset_bindex, bitset_bindex *));
-  int (*reverse_list) PARAMS ((struct bitset_struct *, bitset_bindex *,
-			       bitset_bindex, bitset_bindex *));
-  void (*free) PARAMS ((struct bitset_struct *));
-  enum bitset_type type;
 };
 
 
+/* The contents of this structure should be considered private.
+   It is used for iterating over set bits.  */
+typedef struct
+{
+  bitset_bindex list[BITSET_LIST_SIZE];
+  bitset_bindex next;
+  bitset_bindex num;
+  bitset_bindex i;
+} bitset_iterator;
+
+
 /* Return bytes required for bitset of desired type and size.  */
-extern int bitset_bytes PARAMS ((enum bitset_type, bitset_bindex));
+extern size_t bitset_bytes (enum bitset_type, bitset_bindex);
 
 /* Initialise a bitset with desired type and size.  */
-extern bitset bitset_init PARAMS ((bitset, bitset_bindex, enum bitset_type));
+extern bitset bitset_init (bitset, bitset_bindex, enum bitset_type);
 
-extern enum bitset_type bitset_type_choose PARAMS ((bitset_bindex,
-						    bitset_attrs));
+/* Select an implementation type based on the desired bitset size
+   and attributes.  */
+extern enum bitset_type bitset_type_choose (bitset_bindex, bitset_attrs);
 
-/* Create a bitset of desired type and size.  */
-extern bitset bitset_alloc PARAMS ((bitset_bindex, enum bitset_type));
+/* Create a bitset of desired type and size.  The bitset is zeroed.  */
+extern bitset bitset_alloc (bitset_bindex, enum bitset_type);
 
 /* Free bitset.  */
-extern void bitset_free PARAMS ((bitset));
+extern void bitset_free (bitset);
 
-/* Create a bitset of desired type and size using obstack.  */
-extern bitset bitset_obstack_alloc PARAMS ((struct obstack *bobstack,
-					    bitset_bindex, enum bitset_type));
+/* Create a bitset of desired type and size using an obstack.  The
+   bitset is zeroed.  */
+extern bitset bitset_obstack_alloc (struct obstack *bobstack,
+				    bitset_bindex, enum bitset_type);
 
 /* Free bitset allocated on obstack.  */
-extern void bitset_obstack_free PARAMS ((bitset));
+extern void bitset_obstack_free (bitset);
 
-/* Create a bitset of desired size and attributes.  */
-extern bitset bitset_create PARAMS ((bitset_bindex, bitset_attrs));
+/* Create a bitset of desired size and attributes.  The bitset is zeroed.  */
+extern bitset bitset_create (bitset_bindex, bitset_attrs);
 
-/* Return size in bits of bitset SRC.  */
-extern int bitset_size PARAMS ((bitset));
+/* Return bitset type.  */
+extern enum bitset_type bitset_type_get (bitset);
+
+/* Return bitset type name.  */
+extern const char *bitset_type_name_get (bitset);
 
-#if BITSET_CACHE && BITSET_INLINE
-static inline void bitset_set PARAMS ((bitset, bitset_bindex));
-static inline void bitset_reset PARAMS ((bitset, bitset_bindex));
-static inline int bitset_test PARAMS ((bitset, bitset_bindex));
 
 /* Set bit BITNO in bitset BSET.  */
-static inline void bitset_set (bset, bitno)
-    bitset bset;
-    bitset_bindex bitno;
+static inline void
+bitset_set (bitset bset, bitset_bindex bitno)
 {
-  bitset_windex index = bitno / BITSET_WORD_BITS;
-  bitset_windex offset = index - bset->cindex;
+  bitset_windex windex = bitno / BITSET_WORD_BITS;
+  bitset_windex offset = windex - bset->b.cindex;
 
-  if (offset < bset->csize)
-    bset->cdata[offset] |= (1 << (bitno % BITSET_WORD_BITS));
+  if (offset < bset->b.csize)
+    bset->b.cdata[offset] |= ((bitset_word) 1 << (bitno % BITSET_WORD_BITS));
   else
-    BITSET__SET (bset, bitno);
+    BITSET_SET_ (bset, bitno);
 }
 
 
 /* Reset bit BITNO in bitset BSET.  */
-static inline void bitset_reset (bset, bitno)
-    bitset bset;
-    bitset_bindex bitno;
+static inline void
+bitset_reset (bitset bset, bitset_bindex bitno)
 {
-  bitset_windex index = bitno / BITSET_WORD_BITS;
-  bitset_windex offset = index - bset->cindex;
+  bitset_windex windex = bitno / BITSET_WORD_BITS;
+  bitset_windex offset = windex - bset->b.cindex;
 
-  if (offset < bset->csize)
-    bset->cdata[offset] &= ~(1 << (bitno % BITSET_WORD_BITS));
+  if (offset < bset->b.csize)
+    bset->b.cdata[offset] &= ~((bitset_word) 1 << (bitno % BITSET_WORD_BITS));
   else
-    BITSET__RESET (bset, bitno);
+    BITSET_RESET_ (bset, bitno);
 }
 
 
 /* Test bit BITNO in bitset BSET.  */
-static inline int bitset_test (bset, bitno)
-    bitset bset;
-    bitset_bindex bitno;
+static inline bool
+bitset_test (bitset bset, bitset_bindex bitno)
 {
-  bitset_windex index = bitno / BITSET_WORD_BITS;
-  bitset_windex offset = index - bset->cindex;
+  bitset_windex windex = bitno / BITSET_WORD_BITS;
+  bitset_windex offset = windex - bset->b.cindex;
 
-  if (offset < bset->csize)
-    return (bset->cdata[offset] >> (bitno % BITSET_WORD_BITS)) & 1;
+  if (offset < bset->b.csize)
+    return (bset->b.cdata[offset] >> (bitno % BITSET_WORD_BITS)) & 1;
   else
-    return BITSET__TEST (bset, bitno);
+    return BITSET_TEST_ (bset, bitno);
 }
-#endif
 
-#if BITSET_CACHE && ! BITSET_INLINE
-
-/* Set bit BITNO in bitset BSET.  */
-#define bitset_set(bset, bitno)					\
-do   								\
-{    								\
-  bitset_bindex _bitno = (bitno);				\
-  bitset_windex _index = _bitno / BITSET_WORD_BITS; 		\
-  bitset_windex _offset = _index - (bset)->cindex;		\
-  								\
-  if (_offset < (bset)->csize)					\
-    (bset)->cdata[_offset] |= (1 << (_bitno % BITSET_WORD_BITS)); 	\
-  else  							\
-    BITSET__SET ((bset), _bitno);				\
-} while (0)
 
+/* Toggle bit BITNO in bitset BSET and return non-zero if now set.  */
+#define bitset_toggle(bset, bitno) BITSET_TOGGLE_ (bset, bitno)
 
-/* Reset bit BITNO in bitset BSET.  */
-#define bitset_reset(bset, bitno)				\
-do   								\
-{    								\
-  bitset_bindex _bitno = (bitno);				\
-  bitset_windex _index = _bitno / BITSET_WORD_BITS; 		\
-  bitset_windex _offset = _index - (bset)->cindex;		\
-  								\
-  if (_offset < (bset)->csize)					\
-    (bset)->cdata[_offset] &= ~(1 << (_bitno % BITSET_WORD_BITS)); 	\
-  else  							\
-    BITSET__RESET ((bset), _bitno);				\
-} while (0)
+/* Return size in bits of bitset SRC.  */
+#define bitset_size(SRC) BITSET_SIZE_ (SRC)
 
+/* Change size of bitset.  */
+extern void bitset_resize (bitset, bitset_bindex);
 
-/* Test bit BITNO in bitset BSET.  */
-#define bitset_test(bset, bitno) \
-(((((bitno) / BITSET_WORD_BITS) - (bset)->cindex) < (bset)->csize) \
-  ? ((bset)->cdata[(((bitno) / BITSET_WORD_BITS) - (bset)->cindex)] \
-     >> ((bitno) % BITSET_WORD_BITS)) & 1 \
-  : (unsigned int) BITSET__TEST ((bset), (bitno)))
-#endif
+/* Return number of bits set in bitset SRC.  */
+#define bitset_count(SRC) BITSET_COUNT_ (SRC)
 
-#if ! BITSET_CACHE
-/* Set bit BITNO in bitset SRC.  */
-#define bitset_set(SRC, BITNO) BITSET__SET (SRC, BITNO)
 
-/* Reset bit BITNO in bitset SRC.  */
-#define bitset_reset(SRC, BITNO) BITSET__RESET (SRC, BITNO)
+/* Return SRC == 0.  */
+#define bitset_empty_p(SRC) BITSET_EMPTY_P_ (SRC)
 
-/* Return non-zero if bit BITNO in bitset SRC is set.  */
-#define bitset_test(SRC, BITNO) BITSET__TEST (SRC, BITNO)
-#endif
+/* DST = ~0.  */
+#define bitset_ones(DST) BITSET_ONES_ (DST)
 
 /* DST = 0.  */
-extern int bitset_zero PARAMS ((bitset));
+#define bitset_zero(DST) BITSET_ZERO_ (DST)
 
-/* DST = ~0.  */
-extern int bitset_ones PARAMS ((bitset));
 
-/* Return non-zero if all bits in bitset SRC are reset.  */
-extern int bitset_empty_p PARAMS ((bitset));
 
-/* Return DST == DST | SRC.  */
-extern int bitset_subset_p PARAMS ((bitset, bitset));
+/* DST = SRC.  */
+#define bitset_copy(DST, SRC) BITSET_COPY_ (DST, SRC)
 
-/* Return DST == SRC.  */
-extern int bitset_equal_p PARAMS ((bitset, bitset));
+/* Return DST & SRC == 0.  */
+#define bitset_disjoint_p(DST, SRC) BITSET_DISJOINT_P_ (DST, SRC)
 
-/* DST == SRC.  */
-extern int bitset_copy PARAMS ((bitset, bitset));
+/* Return DST == SRC.  */
+#define bitset_equal_p(DST, SRC) BITSET_EQUAL_P_ (DST, SRC)
 
 /* DST = ~SRC.  */
-extern int bitset_not PARAMS ((bitset, bitset));
+#define bitset_not(DST, SRC) BITSET_NOT_ (DST, SRC)
+
+/* Return DST == DST | SRC.  */
+#define bitset_subset_p(DST, SRC) BITSET_SUBSET_P_ (DST, SRC)
 
-/* DST = SRC1 | SRC2.  Return non-zero if DST != SRC1 | SRC2.  */
-extern int bitset_or PARAMS ((bitset, bitset, bitset));
+
+
+/* DST = SRC1 & SRC2.  */
+#define bitset_and(DST, SRC1, SRC2) BITSET_AND_ (DST, SRC1, SRC2)
 
 /* DST = SRC1 & SRC2.  Return non-zero if DST != SRC1 & SRC2.  */
-extern int bitset_and PARAMS ((bitset, bitset, bitset));
+#define bitset_and_cmp(DST, SRC1, SRC2) BITSET_AND_CMP_ (DST, SRC1, SRC2)
 
-/* DST = SRC1 ^ SRC2.  Return non-zero if DST != SRC1 ^ SRC2.  */
-extern int bitset_xor PARAMS ((bitset, bitset, bitset));
+/* DST = SRC1 & ~SRC2.  */
+#define bitset_andn(DST, SRC1, SRC2) BITSET_ANDN_ (DST, SRC1, SRC2)
 
 /* DST = SRC1 & ~SRC2.  Return non-zero if DST != SRC1 & ~SRC2.  */
-extern int bitset_andn PARAMS ((bitset, bitset, bitset));
+#define bitset_andn_cmp(DST, SRC1, SRC2) BITSET_ANDN_CMP_ (DST, SRC1, SRC2)
 
-/* DST = SRC1 | ~SRC2.  Return non-zero if DST != SRC1 | ~SRC2.  */
-extern int bitset_orn PARAMS ((bitset, bitset, bitset));
+/* DST = SRC1 | SRC2.  */
+#define bitset_or(DST, SRC1, SRC2) BITSET_OR_ (DST, SRC1, SRC2)
+
+/* DST = SRC1 | SRC2.  Return non-zero if DST != SRC1 | SRC2.  */
+#define bitset_or_cmp(DST, SRC1, SRC2) BITSET_OR_CMP_ (DST, SRC1, SRC2)
+
+/* DST = SRC1 ^ SRC2.  */
+#define bitset_xor(DST, SRC1, SRC2) BITSET_XOR_ (DST, SRC1, SRC2)
+
+/* DST = SRC1 ^ SRC2.  Return non-zero if DST != SRC1 ^ SRC2.  */
+#define bitset_xor_cmp(DST, SRC1, SRC2) BITSET_XOR_CMP_ (DST, SRC1, SRC2)
 
-/* DST = (SRC1 | SRC2) & SRC3.  Return non-zero if
-   DST != (SRC1 | SRC2) & SRC3.  */
-extern int bitset_or_and PARAMS ((bitset, bitset, bitset, bitset));
+
+
+/* DST = (SRC1 & SRC2) | SRC3.  */
+#define bitset_and_or(DST, SRC1, SRC2, SRC3) \
+ BITSET_AND_OR_ (DST, SRC1, SRC2, SRC3)
 
 /* DST = (SRC1 & SRC2) | SRC3.  Return non-zero if
    DST != (SRC1 & SRC2) | SRC3.  */
-extern int bitset_and_or PARAMS ((bitset, bitset, bitset, bitset));
+#define bitset_and_or_cmp(DST, SRC1, SRC2, SRC3) \
+ BITSET_AND_OR_CMP_ (DST, SRC1, SRC2, SRC3)
+
+/* DST = (SRC1 & ~SRC2) | SRC3.  */
+#define bitset_andn_or(DST, SRC1, SRC2, SRC3) \
+ BITSET_ANDN_OR_ (DST, SRC1, SRC2, SRC3)
 
 /* DST = (SRC1 & ~SRC2) | SRC3.  Return non-zero if
    DST != (SRC1 & ~SRC2) | SRC3.  */
-#define bitset_andn_or(DST, SRC1, SRC2, SRC3) \
+#define bitset_andn_or_cmp(DST, SRC1, SRC2, SRC3) \
+ BITSET_ANDN_OR_CMP_ (DST, SRC1, SRC2, SRC3)
 
-/* Find next bit set in BSET starting from and including BITNO.  */
-extern int bitset_next PARAMS ((bitset, bitset_bindex));
+/* DST = (SRC1 | SRC2) & SRC3.  */
+#define bitset_or_and(DST, SRC1, SRC2, SRC3)\
+ BITSET_OR_AND_ (DST, SRC1, SRC2, SRC3)
 
-/* Find previous bit set in BSET starting from and including BITNO.  */
-extern int bitset_prev PARAMS ((bitset, bitset_bindex));
+/* DST = (SRC1 | SRC2) & SRC3.  Return non-zero if
+   DST != (SRC1 | SRC2) & SRC3.  */
+#define bitset_or_and_cmp(DST, SRC1, SRC2, SRC3)\
+ BITSET_OR_AND_CMP_ (DST, SRC1, SRC2, SRC3)
 
 /* Find list of up to NUM bits set in BSET starting from and including
    *NEXT.  Return with actual number of bits found and with *NEXT
    indicating where search stopped.  */
-#if BITSET_STATS
-extern int bitset_list PARAMS ((bitset, bitset_bindex *, bitset_bindex,
-				bitset_bindex *));
-#else
 #define bitset_list(BSET, LIST, NUM, NEXT) \
-BITSET__LIST (BSET, LIST, NUM, NEXT)
-#endif
+ BITSET_LIST_ (BSET, LIST, NUM, NEXT)
 
 /* Find reverse list of up to NUM bits set in BSET starting from and
    including NEXT.  Return with actual number of bits found and with
    *NEXT indicating where search stopped.  */
-#define bitset_reverse_list(BSET, LIST, NUM, NEXT) \
-BITSET__REVERSE_LIST (BSET, LIST, NUM, NEXT)
+#define bitset_list_reverse(BSET, LIST, NUM, NEXT) \
+ BITSET_LIST_REVERSE_ (BSET, LIST, NUM, NEXT)
+
+/* Return true if both bitsets are of the same type and size.  */
+extern bool bitset_compatible_p (bitset bset1, bitset bset2);
+
+/* Find next set bit from the given bit index.  */
+extern bitset_bindex bitset_next (bitset, bitset_bindex);
+
+/* Find previous set bit from the given bit index.  */
+extern bitset_bindex bitset_prev (bitset, bitset_bindex);
 
 /* Find first set bit.  */
-extern int bitset_first PARAMS ((bitset));
+extern bitset_bindex bitset_first (bitset);
 
 /* Find last set bit.  */
-extern int bitset_last PARAMS ((bitset));
+extern bitset_bindex bitset_last (bitset);
+
+/* Return nonzero if this is the only set bit.  */
+extern bool bitset_only_set_p (bitset, bitset_bindex);
 
 /* Dump bitset.  */
-extern void bitset_dump PARAMS ((FILE *, bitset));
-
-/* Loop over all elements of BSET, starting with MIN, executing CODE.  */
-#define BITSET_EXECUTE(BSET, MIN, N, CODE)				\
-do {									\
-  bitset_bindex _list[BITSET_LIST_SIZE];				\
-  bitset_bindex _next = (MIN);						\
-  int _num;								\
-    									\
-  while ((_num = bitset_list ((BSET), _list, BITSET_LIST_SIZE, &_next)))\
-    {									\
-       int _i;								\
-									\
-       for (_i = 0; _i < _num; _i++)					\
-	 {								\
-	    (N) = _list[_i];						\
-            CODE;							\
-	 }								\
-       if (_num < BITSET_LIST_SIZE)					\
-         break;								\
-    }									\
-} while (0)
+extern void bitset_dump (FILE *, bitset);
+
+/* Loop over all elements of BSET, starting with MIN, setting INDEX
+   to the index of each set bit.  For example, the following will print
+   the bits set in a bitset:
+
+   bitset_bindex i;
+   bitset_iterator iter;
+
+   BITSET_FOR_EACH (iter, src, i, 0)
+   {
+      printf ("%lu ", (unsigned long int) i);
+   };
+*/
+#define BITSET_FOR_EACH(ITER, BSET, INDEX, MIN)				      \
+  for (ITER.next = (MIN), ITER.num = BITSET_LIST_SIZE;			      \
+       (ITER.num == BITSET_LIST_SIZE)					      \
+       && (ITER.num = bitset_list (BSET, ITER.list,			      \
+				   BITSET_LIST_SIZE, &ITER.next));)	      \
+    for (ITER.i = 0;							      \
+	 ITER.i < ITER.num && ((INDEX) = ITER.list[ITER.i], 1);		      \
+	 ITER.i++)
 
 
 /* Loop over all elements of BSET, in reverse order starting with
-   MIN, executing CODE.  */
-#define BITSET_REVERSE_EXECUTE(BSET, MIN, N, CODE)			\
-do {									\
-  bitset_bindex _list[BITSET_LIST_SIZE];				\
-  bitset_bindex _next = (MIN);						\
-  int _num;								\
-    									\
-  while ((_num = bitset_reverse_list ((BSET), _list, 			\
-                                      BITSET_LIST_SIZE, &_next)))	\
-    {									\
-       int _i;								\
-									\
-       for (_i = 0; _i < _num; _i++)					\
-	 {								\
-	    (N) = _list[_i];						\
-            CODE;							\
-	 }								\
-       if (_num < BITSET_LIST_SIZE)					\
-         break;								\
-    }									\
-} while (0)
-
-
-/* Define set operations in terms of bit operations.  */
-
-#define bitset_diff(DST, SRC1, SRC2)  bitset_andn (DST, SRC1, SRC2)
-
-#define bitset_intersection(DST, SRC1, SRC2)  bitset_and (DST, SRC1, SRC2)
-
-#define bitset_union(DST, SRC1, SRC2)  bitset_or (DST, SRC1, SRC2)
+   MIN, setting INDEX to the index of each set bit.  For example, the
+   following will print the bits set in a bitset in reverse order:
+
+   bitset_bindex i;
+   bitset_iterator iter;
+
+   BITSET_FOR_EACH_REVERSE (iter, src, i, 0)
+   {
+      printf ("%lu ", (unsigned long int) i);
+   };
+*/
+#define BITSET_FOR_EACH_REVERSE(ITER, BSET, INDEX, MIN)			      \
+  for (ITER.next = (MIN), ITER.num = BITSET_LIST_SIZE;			      \
+       (ITER.num == BITSET_LIST_SIZE)					      \
+       && (ITER.num = bitset_list_reverse (BSET, ITER.list,		      \
+					   BITSET_LIST_SIZE, &ITER.next));)   \
+    for (ITER.i = 0;							      \
+	 ITER.i < ITER.num && ((INDEX) = ITER.list[ITER.i], 1);		      \
+	 ITER.i++)
+
+
+/* Define set operations in terms of logical operations.  */
+
+#define bitset_diff(DST, SRC1, SRC2) bitset_andn (DST, SRC1, SRC2)
+#define bitset_diff_cmp(DST, SRC1, SRC2) bitset_andn_cmp (DST, SRC1, SRC2)
+
+#define bitset_intersection(DST, SRC1, SRC2) bitset_and (DST, SRC1, SRC2)
+#define bitset_intersection_cmp(DST, SRC1, SRC2) bitset_and_cmp (DST, SRC1, SRC2)
 
+#define bitset_union(DST, SRC1, SRC2) bitset_or (DST, SRC1, SRC2)
+#define bitset_union_cmp(DST, SRC1, SRC2) bitset_or_cmp (DST, SRC1, SRC2)
+
+/* Symmetrical difference.  */
+#define bitset_symdiff(DST, SRC1, SRC2) bitset_xor (DST, SRC1, SRC2)
+#define bitset_symdiff_cmp(DST, SRC1, SRC2) bitset_xor_cmp (DST, SRC1, SRC2)
+
+/* Union of difference.  */
 #define bitset_diff_union(DST, SRC1, SRC2, SRC3) \
-bitset_andn_or (DST, SRC1, SRC2, SRC3)
+  bitset_andn_or (DST, SRC1, SRC2, SRC3)
+#define bitset_diff_union_cmp(DST, SRC1, SRC2, SRC3) \
+  bitset_andn_or_cmp (DST, SRC1, SRC2, SRC3)
+
 
 /* Release any memory tied up with bitsets.  */
-extern void bitset_release_memory PARAMS ((void));
+extern void bitset_release_memory (void);
 
-/* Initialise bitset stats.  */
-extern void bitset_stats_init PARAMS ((void));
+/* Enable bitset stats gathering.  */
+extern void bitset_stats_enable (void);
 
-/* Dump bitset stats.  */
-extern void bitset_stats_dump PARAMS ((FILE *));
+/* Disable bitset stats gathering.  */
+extern void bitset_stats_disable (void);
 
-/* Function to debug bitset from debugger.  */
-extern void debug_bitset PARAMS ((bitset));
+/* Read bitset stats file of accummulated stats.  */
+void bitset_stats_read (const char *file_name);
 
-/* Function to debug bitset stats from debugger.  */
-extern void debug_bitset_stats PARAMS ((void));
+/* Write bitset stats file of accummulated stats.  */
+void bitset_stats_write (const char *file_name);
 
-extern bitset sbitset_init PARAMS ((bitset, bitset_bindex));
+/* Dump bitset stats.  */
+extern void bitset_stats_dump (FILE *);
 
-extern bitset lbitset_init PARAMS ((bitset, bitset_bindex));
+/* Function to debug bitset from debugger.  */
+extern void debug_bitset (bitset);
 
-extern bitset ebitset_init PARAMS ((bitset, bitset_bindex));
+/* Function to debug bitset stats from debugger.  */
+extern void debug_bitset_stats (void);
 
 #endif /* _BITSET_H  */