-/* Functions to support efficient bitsets.
+/* Functions to support expandable bitsets.
Copyright (C) 2002 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 2 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, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include "bitset.h"
+#include "ebitset.h"
#include "obstack.h"
#include <stdlib.h>
-# if WITH_DMALLOC
-# define DMALLOC_FUNC_CHECK
-# include <dmalloc.h>
-# endif /* WITH_DMALLOC */
-
-/* This file implements linked-list bitsets. These bitsets can be of
+/* This file implements expandable bitsets. These bitsets can be of
arbitrary length and are more efficient than arrays of bits for
large sparse sets.
- Usually if all the bits in an element are zero we remove the element
- from the list. However, a side effect of the bit caching is that we
- do not always notice when an element becomes zero. Hence the
- ebitset_weed function which removes zero elements.
-
Empty elements are represented by a NULL pointer in the table of
element pointers. An alternative is to point to a special zero
element. Similarly, we could represent an all 1's element with
Bitsets are commonly empty so we need to ensure that this special
case is fast. A zero bitset is indicated when cdata is 0. This is
conservative since cdata may be non zero and the bitset may still
- be zero.
+ be zero.
The bitset cache can be disabled either by setting cindex to
- some large number or by setting csize to 0. Here
+ BITSET_WINDEX_MAX or by setting csize to 0. Here
we use the former approach since cindex needs to be updated whenever
- cdata is changed.
+ cdata is changed.
*/
+
+/* Number of words to use for each element. */
+#define EBITSET_ELT_WORDS 2
+
+/* Number of bits stored in each element. */
+#define EBITSET_ELT_BITS \
+ ((unsigned) (EBITSET_ELT_WORDS * BITSET_WORD_BITS))
+
+/* Ebitset element. We use an array of bits. */
+typedef struct ebitset_elt_struct
+{
+ union
+ {
+ bitset_word words[EBITSET_ELT_WORDS]; /* Bits that are set. */
+ struct ebitset_elt_struct *next;
+ }
+ u;
+}
+ebitset_elt;
+
+
+typedef ebitset_elt *ebitset_elts;
+
+
/* Number of elements to initially allocate. */
+
#ifndef EBITSET_INITIAL_SIZE
#define EBITSET_INITIAL_SIZE 2
#endif
/* Minimum number of elements to grow table. */
+
#ifndef EBITSET_GROW_SIZE
#define EBITSET_GROW_SIZE 4
#endif
-
-enum ebitset_find_mode {EBITSET_FIND, EBITSET_CREATE, EBITSET_SUBST};
+enum ebitset_find_mode
+ { EBITSET_FIND, EBITSET_CREATE, EBITSET_SUBST };
+typedef int enum_ebitset_find_mode;
static ebitset_elt ebitset_zero_elts[1]; /* Elements of all zero bits. */
/* Obstack to allocate bitset elements from. */
static struct obstack ebitset_obstack;
static int ebitset_obstack_init = 0;
-static ebitset_elt *ebitset_free_list; /* Free list of bitset elements. */
+static ebitset_elt *ebitset_free_list; /* Free list of bitset elements. */
-static void ebitset_elts_grow PARAMS ((bitset, unsigned int));
+static void ebitset_elts_grow PARAMS ((bitset, bitset_windex));
static ebitset_elt *ebitset_elt_alloc PARAMS ((void));
static ebitset_elt *ebitset_elt_calloc PARAMS ((void));
-static void ebitset_elt_add PARAMS ((bitset, ebitset_elt *, unsigned int));
-static void ebitset_elt_remove PARAMS ((bitset, unsigned int));
+static void ebitset_elt_add PARAMS ((bitset, ebitset_elt *, bitset_windex));
+static void ebitset_elt_remove PARAMS ((bitset, bitset_windex));
static void ebitset_elt_free PARAMS ((ebitset_elt *));
static ebitset_elt *ebitset_elt_find PARAMS ((bitset, bitset_windex,
- enum ebitset_find_mode));
+ enum_ebitset_find_mode));
static ebitset_elt *ebitset_elt_last PARAMS ((bitset));
static int ebitset_elt_zero_p PARAMS ((ebitset_elt *));
-static int ebitset_weed PARAMS ((bitset));
-static void ebitset_zero PARAMS((bitset));
-static int ebitset_equal_p PARAMS((bitset, bitset));
-static void ebitset_copy PARAMS((bitset, bitset));
-static int ebitset_copy_compare PARAMS((bitset, bitset));
-static void ebitset_set PARAMS((bitset, bitset_bindex));
-static void ebitset_reset PARAMS((bitset, bitset_bindex));
-static int ebitset_test PARAMS((bitset, bitset_bindex));
-static int ebitset_size PARAMS((bitset));
-static int ebitset_op1 PARAMS((bitset, enum bitset_ops));
-static int ebitset_op2 PARAMS((bitset, bitset, enum bitset_ops));
-static int ebitset_op3 PARAMS((bitset, bitset, bitset, enum bitset_ops));
-static int ebitset_op4 PARAMS((bitset, bitset, bitset, bitset,
- enum bitset_ops));
-static int ebitset_list PARAMS((bitset, bitset_bindex *, bitset_bindex,
- bitset_bindex *));
-static int ebitset_reverse_list PARAMS((bitset, bitset_bindex *, bitset_bindex,
- bitset_bindex *));
-static void ebitset_free PARAMS((bitset));
-
-
-#define EBITSET_ELTS(BSET) ((BSET)->u.e.elts)
-#define EBITSET_SIZE(BSET) ((BSET)->u.e.size)
+static bitset_windex ebitset_weed PARAMS ((bitset));
+static void ebitset_zero PARAMS ((bitset));
+static void ebitset_copy_ PARAMS ((bitset, bitset));
+static int ebitset_copy_cmp PARAMS ((bitset, bitset));
+static void ebitset_set PARAMS ((bitset, bitset_bindex));
+static void ebitset_reset PARAMS ((bitset, bitset_bindex));
+static int ebitset_test PARAMS ((bitset, bitset_bindex));
+static bitset_bindex ebitset_size PARAMS ((bitset));
+static int ebitset_disjoint_p PARAMS ((bitset, bitset));
+static int ebitset_equal_p PARAMS ((bitset, bitset));
+static void ebitset_not PARAMS ((bitset, bitset));
+static int ebitset_subset_p PARAMS ((bitset, bitset));
+static int ebitset_op3_cmp PARAMS ((bitset, bitset, bitset, enum_bitset_ops));
+static void ebitset_and PARAMS ((bitset, bitset, bitset));
+static int ebitset_and_cmp PARAMS ((bitset, bitset, bitset));
+static void ebitset_andn PARAMS ((bitset, bitset, bitset));
+static int ebitset_andn_cmp PARAMS ((bitset, bitset, bitset));
+static void ebitset_or PARAMS ((bitset, bitset, bitset));
+static int ebitset_or_cmp PARAMS ((bitset, bitset, bitset));
+static void ebitset_xor PARAMS ((bitset, bitset, bitset));
+static int ebitset_xor_cmp PARAMS ((bitset, bitset, bitset));
+static void ebitset_copy PARAMS ((bitset, bitset));
+static bitset_bindex ebitset_list PARAMS ((bitset, bitset_bindex *,
+ bitset_bindex, bitset_bindex *));
+static bitset_bindex ebitset_list_reverse
+PARAMS ((bitset, bitset_bindex *, bitset_bindex, bitset_bindex *));
+static void ebitset_ones PARAMS ((bitset));
+static int ebitset_empty_p PARAMS ((bitset));
+static void ebitset_free PARAMS ((bitset));
+
+#define EBITSET_ELTS(BSET) ((BSET)->e.elts)
+#define EBITSET_SIZE(BSET) ((BSET)->e.size)
#define EBITSET_NEXT(ELT) ((ELT)->u.next)
#define EBITSET_WORDS(ELT) ((ELT)->u.words)
/* Disable bitset cache and mark BSET as being zero. */
-#define EBITSET_ZERO_SET(BSET) ((BSET)->cindex = BITSET_INDEX_MAX, \
- (BSET)->cdata = 0)
+#define EBITSET_ZERO_SET(BSET) ((BSET)->b.cindex = BITSET_WINDEX_MAX, \
+ (BSET)->b.cdata = 0)
-#define EBITSET_CACHE_DISABLE(BSET) ((BSET)->cindex = BITSET_INDEX_MAX)
+#define EBITSET_CACHE_DISABLE(BSET) ((BSET)->b.cindex = BITSET_WINDEX_MAX)
/* Disable bitset cache and mark BSET as being possibly non-zero. */
#define EBITSET_NONZERO_SET(BSET) \
- (EBITSET_CACHE_DISABLE (BSET), (BSET)->cdata = (bitset_word *)~0)
+ (EBITSET_CACHE_DISABLE (BSET), (BSET)->b.cdata = (bitset_word *)~0)
/* A conservative estimate of whether the bitset is zero.
This is non-zero only if we know for sure that the bitset is zero. */
-#define EBITSET_ZERO_P(BSET) ((BSET)->cdata == 0)
+#define EBITSET_ZERO_P(BSET) ((BSET)->b.cdata == 0)
-/* Enable cache to point to element with table index EINDEX.
+/* Enable cache to point to element with table index EINDEX.
The element must exist. */
#define EBITSET_CACHE_SET(BSET, EINDEX) \
- ((BSET)->cindex = (EINDEX) * EBITSET_ELT_WORDS, \
- (BSET)->cdata = EBITSET_WORDS (EBITSET_ELTS (BSET) [EINDEX]))
+ ((BSET)->b.cindex = (EINDEX) * EBITSET_ELT_WORDS, \
+ (BSET)->b.cdata = EBITSET_WORDS (EBITSET_ELTS (BSET) [EINDEX]))
/* Grow the expandable table for BSET by SIZE elements. */
static void
ebitset_elts_grow (bset, size)
- bitset bset;
- unsigned int size;
+ bitset bset;
+ bitset_windex size;
{
- unsigned int oldsize;
- unsigned int newsize;
+ bitset_windex oldsize;
+ bitset_windex newsize;
oldsize = EBITSET_SIZE (bset);
newsize = oldsize + size;
+ if (BITSET_SIZE_MAX / sizeof (ebitset_elt *) < newsize)
+ xalloc_die ();
+
EBITSET_ELTS (bset) = xrealloc (EBITSET_ELTS (bset),
- newsize * sizeof (ebitset_elt *));
+ newsize * sizeof (ebitset_elt *));
EBITSET_SIZE (bset) = newsize;
memset (EBITSET_ELTS (bset) + oldsize, 0, size * sizeof (ebitset_elt *));
}
else
{
- /* We can't use gcc_obstack_init to initialize the obstack since
- print-rtl.c now calls bitset functions, and bitset is linked
- into the gen* functions. */
if (!ebitset_obstack_init)
{
ebitset_obstack_init = 1;
/* Let particular systems override the size of a chunk. */
+
#ifndef OBSTACK_CHUNK_SIZE
#define OBSTACK_CHUNK_SIZE 0
#endif
+
/* Let them override the alloc and free routines too. */
+
#ifndef OBSTACK_CHUNK_ALLOC
#define OBSTACK_CHUNK_ALLOC xmalloc
#endif
+
#ifndef OBSTACK_CHUNK_FREE
#define OBSTACK_CHUNK_FREE free
#endif
obstack_specify_allocation (&ebitset_obstack, OBSTACK_CHUNK_SIZE,
__alignof__ (ebitset_elt),
- (void *(*) PARAMS ((long))) OBSTACK_CHUNK_ALLOC,
- (void (*) PARAMS ((void *))) OBSTACK_CHUNK_FREE);
+ (void *(*)PARAMS ((long)))
+ OBSTACK_CHUNK_ALLOC,
+ (void (*)PARAMS ((void *)))
+ OBSTACK_CHUNK_FREE);
}
/* Perhaps we should add a number of new elements to the free
- list. */
+ list. */
elt = (ebitset_elt *) obstack_alloc (&ebitset_obstack,
sizeof (ebitset_elt));
}
}
-/* Allocate a ebitset element. The bits are not cleared. */
+/* Allocate a ebitset element. The bits are cleared. */
static inline ebitset_elt *
ebitset_elt_calloc ()
{
static inline void
ebitset_elt_remove (bset, eindex)
bitset bset;
- unsigned int eindex;
+ bitset_windex eindex;
{
ebitset_elts *elts;
ebitset_elt *elt;
ebitset_elt_add (bset, elt, eindex)
bitset bset;
ebitset_elt *elt;
- unsigned int eindex;
+ bitset_windex eindex;
{
ebitset_elts *elts;
static ebitset_elt *
-ebitset_elt_find (bset, index, mode)
+ebitset_elt_find (bset, windex, mode)
bitset bset;
- bitset_windex index;
- enum ebitset_find_mode mode;
+ bitset_windex windex;
+ enum_ebitset_find_mode mode;
{
ebitset_elt *elt;
bitset_windex size;
- unsigned int eindex;
+ bitset_windex eindex;
ebitset_elts *elts;
- eindex = index / EBITSET_ELT_WORDS;
+ eindex = windex / EBITSET_ELT_WORDS;
elts = EBITSET_ELTS (bset);
size = EBITSET_SIZE (bset);
if (eindex < size)
{
- ebitset_elt *elt;
-
if ((elt = elts[eindex]))
{
- if (EBITSET_WORDS (elt) == bset->cdata)
+ if (EBITSET_WORDS (elt) == bset->b.cdata)
return elt;
EBITSET_CACHE_SET (bset, eindex);
case EBITSET_CREATE:
if (eindex >= size)
{
- unsigned int extra;
+ bitset_windex extra;
extra = eindex - size + 1;
/* Weed out the zero elements from the elts. */
-static inline int
+static inline bitset_windex
ebitset_weed (bset)
bitset bset;
{
ebitset_elts *elts;
bitset_windex j;
- int count;
+ bitset_windex count;
if (EBITSET_ZERO_P (bset))
return 0;
count = j - count;
if (!count)
{
- /* All the bits are zero. We could shrink the elts.
+ /* All the bits are zero. We could shrink the elts.
For now just mark BSET as known to be zero. */
EBITSET_ZERO_SET (bset);
}
else
EBITSET_NONZERO_SET (bset);
- return count;
+ return count;
}
ebitset_elt_remove (bset, j);
}
- /* All the bits are zero. We could shrink the elts.
+ /* All the bits are zero. We could shrink the elts.
For now just mark BSET as known to be zero. */
EBITSET_ZERO_SET (bset);
}
ebitset_elt *selt = selts[j];
ebitset_elt *delt = delts[j];
- if (! selt && ! delt)
+ if (!selt && !delt)
continue;
- if ((selt && ! delt) || (!selt && delt))
+ if ((selt && !delt) || (!selt && delt))
return 0;
for (i = 0; i < EBITSET_ELT_WORDS; i++)
/* Copy bits from bitset SRC to bitset DST. */
static inline void
-ebitset_copy (dst, src)
+ebitset_copy_ (dst, src)
bitset dst;
bitset src;
{
/* Copy bits from bitset SRC to bitset DST. Return non-zero if
bitsets different. */
static inline int
-ebitset_copy_compare (dst, src)
+ebitset_copy_cmp (dst, src)
bitset dst;
bitset src;
{
if (EBITSET_ZERO_P (dst))
{
- ebitset_copy (dst, src);
- return ! EBITSET_ZERO_P (src);
+ ebitset_copy_ (dst, src);
+ return !EBITSET_ZERO_P (src);
}
if (ebitset_equal_p (dst, src))
return 0;
- ebitset_copy (dst, src);
+ ebitset_copy_ (dst, src);
return 1;
}
/* Return size in bits of bitset SRC. */
-static int
+static bitset_bindex
ebitset_size (src)
bitset src;
{
bitset dst;
bitset_bindex bitno;
{
- bitset_windex index = bitno / BITSET_WORD_BITS;
+ bitset_windex windex = bitno / BITSET_WORD_BITS;
- ebitset_elt_find (dst, index, EBITSET_CREATE);
+ ebitset_elt_find (dst, windex, EBITSET_CREATE);
- dst->cdata[index - dst->cindex] |= (1 << (bitno % BITSET_WORD_BITS));
+ dst->b.cdata[windex - dst->b.cindex] |=
+ (bitset_word) 1 << (bitno % BITSET_WORD_BITS);
}
bitset dst;
bitset_bindex bitno;
{
- bitset_windex index = bitno / BITSET_WORD_BITS;
+ bitset_windex windex = bitno / BITSET_WORD_BITS;
- if (!ebitset_elt_find (dst, index, EBITSET_FIND))
- return;
+ if (!ebitset_elt_find (dst, windex, EBITSET_FIND))
+ return;
- dst->cdata[index - dst->cindex] &= ~(1 << (bitno % BITSET_WORD_BITS));
+ dst->b.cdata[windex - dst->b.cindex] &=
+ ~((bitset_word) 1 << (bitno % BITSET_WORD_BITS));
- /* If all the data is zero, perhaps we should remove it now...
- However, there could be a good chance that the element will be needed
+ /* If all the data is zero, perhaps we should remove it now...
+ However, there is a good chance that the element will be needed
again soon. */
}
bitset src;
bitset_bindex bitno;
{
- bitset_windex index = bitno / BITSET_WORD_BITS;
+ bitset_windex windex = bitno / BITSET_WORD_BITS;
- if (!ebitset_elt_find (src, index, EBITSET_FIND))
+ if (!ebitset_elt_find (src, windex, EBITSET_FIND))
return 0;
- return (src->cdata[index - src->cindex] >> (bitno % BITSET_WORD_BITS)) & 1;
+ return (src->b.
+ cdata[windex - src->b.cindex] >> (bitno % BITSET_WORD_BITS)) & 1;
}
/* 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
-ebitset_reverse_list (bset, list, num, next)
+ *NEXT and store in array LIST. Return with actual number of bits
+ found and with *NEXT indicating where search stopped. */
+static bitset_bindex
+ebitset_list_reverse (bset, list, num, next)
bitset bset;
bitset_bindex *list;
bitset_bindex num;
bitset_bindex n_bits;
bitset_bindex bitno;
bitset_bindex rbitno;
- unsigned int bitcnt;
- bitset_bindex bitoff;
- bitset_windex index;
- unsigned int eindex;
+ unsigned int bcount;
+ bitset_bindex boffset;
bitset_windex windex;
+ bitset_windex eindex;
+ bitset_windex woffset;
bitset_bindex count;
bitset_windex size;
- bitset_word word;
ebitset_elts *elts;
if (EBITSET_ZERO_P (bset))
rbitno = *next;
if (rbitno >= n_bits)
- return 0;
+ return 0;
elts = EBITSET_ELTS (bset);
bitno = n_bits - (rbitno + 1);
- index = bitno / BITSET_WORD_BITS;
+ windex = bitno / BITSET_WORD_BITS;
eindex = bitno / EBITSET_ELT_BITS;
- windex = index - eindex * EBITSET_ELT_WORDS;
+ woffset = windex - eindex * EBITSET_ELT_WORDS;
/* If num is 1, we could speed things up with a binary search
of the word of interest. */
count = 0;
- bitcnt = bitno % BITSET_WORD_BITS;
- bitoff = index * BITSET_WORD_BITS;
+ bcount = bitno % BITSET_WORD_BITS;
+ boffset = windex * BITSET_WORD_BITS;
- for (; eindex != ~0U; eindex--)
+ do
{
ebitset_elt *elt;
bitset_word *srcp;
-
+
elt = elts[eindex];
- if (!elt)
- continue;
-
- srcp = EBITSET_WORDS (elt);
-
- for (; windex != ~0U; windex--, bitoff -= BITSET_WORD_BITS,
- bitcnt = BITSET_WORD_BITS - 1)
- {
- word = srcp[windex] << (BITSET_WORD_BITS - 1 - bitcnt);
-
- for (; word; bitcnt--)
+ if (elt)
+ {
+ srcp = EBITSET_WORDS (elt);
+
+ do
{
- if (word & BITSET_MSB)
+ bitset_word word;
+
+ word = srcp[woffset] << (BITSET_WORD_BITS - 1 - bcount);
+
+ for (; word; bcount--)
{
- list[count++] = bitoff + bitcnt;
- if (count >= num)
+ if (word & BITSET_MSB)
{
- *next = n_bits - (bitoff + bitcnt);
- return count;
+ list[count++] = boffset + bcount;
+ if (count >= num)
+ {
+ *next = n_bits - (boffset + bcount);
+ return count;
+ }
}
+ word <<= 1;
}
- word <<= 1;
+ boffset -= BITSET_WORD_BITS;
+ bcount = BITSET_WORD_BITS - 1;
}
+ while (woffset--);
}
- windex = EBITSET_ELT_WORDS;
+ woffset = EBITSET_ELT_WORDS - 1;
+ boffset = eindex * EBITSET_ELT_BITS - BITSET_WORD_BITS;
}
+ while (eindex--);
- *next = n_bits - (bitoff + 1);
+ *next = n_bits - (boffset + 1);
return count;
}
/* 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
+ *NEXT and store in array LIST. Return with actual number of bits
+ found and with *NEXT indicating where search stopped. */
+static bitset_bindex
ebitset_list (bset, list, num, next)
bitset bset;
bitset_bindex *list;
bitset_bindex *next;
{
bitset_bindex bitno;
- bitset_windex index;
- unsigned int eindex;
+ bitset_windex windex;
+ bitset_windex eindex;
bitset_bindex count;
bitset_windex size;
ebitset_elt *elt;
elt = elts[eindex];
if (elt)
{
- bitset_windex windex;
+ bitset_windex woffset;
bitset_word *srcp = EBITSET_WORDS (elt);
- index = bitno / BITSET_WORD_BITS;
- windex = eindex / EBITSET_ELT_WORDS;
+ windex = bitno / BITSET_WORD_BITS;
+ woffset = eindex * EBITSET_ELT_WORDS;
- for (; (index - windex) < EBITSET_ELT_WORDS; index++)
+ for (; (windex - woffset) < EBITSET_ELT_WORDS; windex++)
{
- word = srcp[index - windex] >> (bitno % BITSET_WORD_BITS);
+ word = srcp[windex - woffset] >> (bitno % BITSET_WORD_BITS);
for (; word; bitno++)
{
}
word >>= 1;
}
- bitno = (index + 1) * BITSET_WORD_BITS;
+ bitno = (windex + 1) * BITSET_WORD_BITS;
}
}
for (; eindex < size; eindex++)
{
int i;
- ebitset_elt *elt;
bitset_word *srcp;
elt = elts[eindex];
continue;
srcp = EBITSET_WORDS (elt);
- index = eindex * EBITSET_ELT_WORDS;
+ windex = eindex * EBITSET_ELT_WORDS;
if ((count + EBITSET_ELT_BITS) < num)
{
/* The coast is clear, plant boot! */
- for (i = 0; i < EBITSET_ELT_WORDS; i++, index++)
+ for (i = 0; i < EBITSET_ELT_WORDS; i++, windex++)
{
- bitno = index * BITSET_WORD_BITS;
+ bitno = windex * BITSET_WORD_BITS;
word = srcp[i];
if (word)
{
- if (! (word & 0xffff))
+ if (!(word & 0xffff))
{
word >>= 16;
bitno += 16;
}
- if (! (word & 0xff))
+ if (!(word & 0xff))
{
word >>= 8;
bitno += 8;
/* Tread more carefully since we need to check
if array overflows. */
- for (i = 0; i < EBITSET_ELT_WORDS; i++, index++)
+ for (i = 0; i < EBITSET_ELT_WORDS; i++, windex++)
{
- bitno = index * BITSET_WORD_BITS;
+ bitno = windex * BITSET_WORD_BITS;
for (word = srcp[i]; word; bitno++)
{
}
-static int
-ebitset_op1 (dst, op)
+static void
+ebitset_ones (dst)
bitset dst;
- enum bitset_ops op;
{
bitset_windex j;
ebitset_elt *elt;
- switch (op)
- {
- case BITSET_ZERO:
- ebitset_zero (dst);
- return 1;
- case BITSET_ONES:
- for (j = 0; j < EBITSET_SIZE (dst); j++)
- {
- /* Create new elements if they cannot be found. Perhaps
- we should just add pointers to a ones element. */
- elt = ebitset_elt_find (dst, j * EBITSET_ELT_WORDS, EBITSET_CREATE);
- memset (EBITSET_WORDS (elt), ~0, sizeof (EBITSET_WORDS (elt)));
- }
- break;
-
- case BITSET_EMPTY_P:
- return ! ebitset_weed (dst);
-
- default:
- abort ();
+ for (j = 0; j < EBITSET_SIZE (dst); j++)
+ {
+ /* Create new elements if they cannot be found. Perhaps
+ we should just add pointers to a ones element. */
+ elt =
+ ebitset_elt_find (dst, j * EBITSET_ELT_WORDS, EBITSET_CREATE);
+ memset (EBITSET_WORDS (elt), -1, sizeof (EBITSET_WORDS (elt)));
}
-
EBITSET_NONZERO_SET (dst);
- return 1;
}
static int
-ebitset_op2 (dst, src, op)
+ebitset_empty_p (dst)
+ bitset dst;
+{
+ return !ebitset_weed (dst);
+}
+
+
+static void
+ebitset_not (dst, src)
bitset dst;
bitset src;
- enum bitset_ops op;
{
+ unsigned int i;
ebitset_elt *selt;
ebitset_elt *delt;
- unsigned int i;
bitset_windex j;
- switch (op)
+ for (j = 0; j < EBITSET_SIZE (src); j++)
{
- case BITSET_COPY:
- ebitset_copy (dst, src);
- break;
-
- case BITSET_NOT:
- for (j = 0; j < EBITSET_SIZE (src); j++)
- {
- /* Create new elements for dst if they cannot be found
+ /* Create new elements for dst if they cannot be found
or substitute zero elements if src elements not found. */
- selt = ebitset_elt_find (dst, j * EBITSET_ELT_WORDS, EBITSET_SUBST);
- delt = ebitset_elt_find (dst, j * EBITSET_ELT_WORDS, EBITSET_CREATE);
+ selt =
+ ebitset_elt_find (dst, j * EBITSET_ELT_WORDS, EBITSET_SUBST);
+ delt =
+ ebitset_elt_find (dst, j * EBITSET_ELT_WORDS, EBITSET_CREATE);
- for (i = 0; i < EBITSET_ELT_WORDS; i++)
- EBITSET_WORDS (delt)[i] = ~EBITSET_WORDS (selt)[i];
- }
- break;
-
- case BITSET_EQUAL_P:
- return ebitset_equal_p (dst, src);
-
- /* Return 1 if DST == DST | SRC. */
- case BITSET_SUBSET_P:
- {
- ebitset_elts *selts;
- ebitset_elts *delts;
- bitset_windex ssize;
- bitset_windex dsize;
-
- selts = EBITSET_ELTS (src);
- delts = EBITSET_ELTS (dst);
-
- ssize = EBITSET_SIZE (src);
- dsize = EBITSET_SIZE (dst);
-
- for (j = 0; j < ssize; j++)
- {
- ebitset_elt *selt;
- ebitset_elt *delt;
-
- selt = j < ssize ? selts[j] : 0;
- delt = j < dsize ? delts[j] : 0;
-
- if (! selt && ! delt)
- continue;
-
- if (!selt)
- selt = &ebitset_zero_elts[0];
- if (!delt)
- delt = &ebitset_zero_elts[0];
-
- for (i = 0; i < EBITSET_ELT_WORDS; i++)
- if (EBITSET_WORDS (delt)[i]
- != (EBITSET_WORDS (selt)[i] | EBITSET_WORDS (delt)[i]))
- return 0;
- }
- return 1;
- }
- break;
+ for (i = 0; i < EBITSET_ELT_WORDS; i++)
+ EBITSET_WORDS (delt)[i] = ~EBITSET_WORDS (selt)[i];
+ }
+ EBITSET_NONZERO_SET (dst);
+}
- default:
- abort ();
+
+/* Return 1 if DST == DST | SRC. */
+static int
+ebitset_subset_p (dst, src)
+ bitset dst;
+ bitset src;
+{
+ bitset_windex j;
+ ebitset_elts *selts;
+ ebitset_elts *delts;
+ bitset_windex ssize;
+ bitset_windex dsize;
+
+ selts = EBITSET_ELTS (src);
+ delts = EBITSET_ELTS (dst);
+
+ ssize = EBITSET_SIZE (src);
+ dsize = EBITSET_SIZE (dst);
+
+ for (j = 0; j < ssize; j++)
+ {
+ unsigned int i;
+ ebitset_elt *selt;
+ ebitset_elt *delt;
+
+ selt = j < ssize ? selts[j] : 0;
+ delt = j < dsize ? delts[j] : 0;
+
+ if (!selt && !delt)
+ continue;
+
+ if (!selt)
+ selt = &ebitset_zero_elts[0];
+ if (!delt)
+ delt = &ebitset_zero_elts[0];
+
+ for (i = 0; i < EBITSET_ELT_WORDS; i++)
+ if (EBITSET_WORDS (delt)[i]
+ != (EBITSET_WORDS (selt)[i] | EBITSET_WORDS (delt)[i]))
+ return 0;
}
+ return 1;
+}
- EBITSET_NONZERO_SET (dst);
+
+/* Return 1 if DST & SRC == 0. */
+static int
+ebitset_disjoint_p (dst, src)
+ bitset dst;
+ bitset src;
+{
+ bitset_windex j;
+ ebitset_elts *selts;
+ ebitset_elts *delts;
+ bitset_windex ssize;
+ bitset_windex dsize;
+
+ selts = EBITSET_ELTS (src);
+ delts = EBITSET_ELTS (dst);
+
+ ssize = EBITSET_SIZE (src);
+ dsize = EBITSET_SIZE (dst);
+
+ for (j = 0; j < ssize; j++)
+ {
+ unsigned int i;
+ ebitset_elt *selt;
+ ebitset_elt *delt;
+
+ selt = j < ssize ? selts[j] : 0;
+ delt = j < dsize ? delts[j] : 0;
+
+ if (!selt || !delt)
+ continue;
+
+ for (i = 0; i < EBITSET_ELT_WORDS; i++)
+ if ((EBITSET_WORDS (selt)[i] & EBITSET_WORDS (delt)[i]))
+ return 0;
+ }
return 1;
}
+
static int
-ebitset_op3 (dst, src1, src2, op)
+ebitset_op3_cmp (dst, src1, src2, op)
bitset dst;
bitset src1;
bitset src2;
- enum bitset_ops op;
+ enum_bitset_ops op;
{
bitset_windex ssize1;
bitset_windex ssize2;
unsigned int i;
bitset_windex j;
- /* Fast track common, simple cases. */
- if (EBITSET_ZERO_P (src2))
- {
- if (op == BITSET_AND)
- {
- ebitset_weed (dst);
- changed = EBITSET_ZERO_P (dst);
- ebitset_zero (dst);
- return changed;
- }
- else if (op == BITSET_ANDN || op == BITSET_OR || op == BITSET_XOR)
- {
- return ebitset_copy_compare (dst, src1);
- }
- }
- else if (EBITSET_ZERO_P (src1))
- {
- if (op == BITSET_AND || op == BITSET_ANDN)
- {
- ebitset_weed (dst);
- changed = EBITSET_ZERO_P (dst);
- ebitset_zero (dst);
- return changed;
- }
- else if (op == BITSET_OR || op == BITSET_XOR)
- {
- return ebitset_copy_compare (dst, src2);
- }
- }
-
ssize1 = EBITSET_SIZE (src1);
ssize2 = EBITSET_SIZE (src2);
dsize = EBITSET_SIZE (dst);
size = ssize2;
if (size > dsize)
- ebitset_elts_grow (dst, size - dsize);
+ ebitset_elts_grow (dst, size - dsize);
selts1 = EBITSET_ELTS (src1);
selts2 = EBITSET_ELTS (src2);
selt2 = j < ssize2 ? selts2[j] : 0;
delt = j < dsize ? delts[j] : 0;
- if (! selt1 && ! selt2)
+ if (!selt1 && !selt2)
{
if (delt)
{
dstp = EBITSET_WORDS (delt);
switch (op)
{
- case BITSET_OR:
+ case BITSET_OP_OR:
for (i = 0; i < EBITSET_ELT_WORDS; i++, dstp++)
{
bitset_word tmp = *srcp1++ | *srcp2++;
}
break;
- case BITSET_AND:
+ case BITSET_OP_AND:
for (i = 0; i < EBITSET_ELT_WORDS; i++, dstp++)
{
bitset_word tmp = *srcp1++ & *srcp2++;
}
break;
- case BITSET_XOR:
+ case BITSET_OP_XOR:
for (i = 0; i < EBITSET_ELT_WORDS; i++, dstp++)
{
bitset_word tmp = *srcp1++ ^ *srcp2++;
}
break;
- case BITSET_ANDN:
+ case BITSET_OP_ANDN:
for (i = 0; i < EBITSET_ELT_WORDS; i++, dstp++)
{
bitset_word tmp = *srcp1++ & ~(*srcp2++);
}
break;
- case BITSET_ORN:
- for (i = 0; i < EBITSET_ELT_WORDS; i++, dstp++)
- {
- bitset_word tmp = *srcp1++ | ~(*srcp2++);
-
- if (*dstp != tmp)
- {
- changed = 1;
- *dstp = tmp;
- }
- }
- break;
-
default:
abort ();
}
- if (! ebitset_elt_zero_p (delt))
+ if (!ebitset_elt_zero_p (delt))
{
ebitset_elt_add (dst, delt, j);
}
}
+static void
+ebitset_and (dst, src1, src2)
+ bitset dst;
+ bitset src1;
+ bitset src2;
+{
+ ebitset_and_cmp (dst, src1, src2);
+}
+
+
static int
-ebitset_op4 (dst, src1, src2, src3, op)
+ebitset_and_cmp (dst, src1, src2)
bitset dst;
bitset src1;
bitset src2;
- bitset src3;
- enum bitset_ops op;
{
- int changed = 0;
- bitset tmp;
+ int changed;
+
+ if (EBITSET_ZERO_P (src2))
+ {
+ ebitset_weed (dst);
+ changed = EBITSET_ZERO_P (dst);
+ ebitset_zero (dst);
+ return changed;
+ }
+ else if (EBITSET_ZERO_P (src1))
+ {
+ ebitset_weed (dst);
+ changed = EBITSET_ZERO_P (dst);
+ ebitset_zero (dst);
+ return changed;
+ }
+ return ebitset_op3_cmp (dst, src1, src2, BITSET_OP_AND);
+}
+
+
+static void
+ebitset_andn (dst, src1, src2)
+ bitset dst;
+ bitset src1;
+ bitset src2;
+{
+ ebitset_andn_cmp (dst, src1, src2);
+}
+
+
+static int
+ebitset_andn_cmp (dst, src1, src2)
+ bitset dst;
+ bitset src1;
+ bitset src2;
+{
+ int changed;
+
+ if (EBITSET_ZERO_P (src2))
+ {
+ return ebitset_copy_cmp (dst, src1);
+ }
+ else if (EBITSET_ZERO_P (src1))
+ {
+ ebitset_weed (dst);
+ changed = EBITSET_ZERO_P (dst);
+ ebitset_zero (dst);
+ return changed;
+ }
+ return ebitset_op3_cmp (dst, src1, src2, BITSET_OP_ANDN);
+}
- tmp = bitset_create (BITSET_LIST, 0);
- switch (op)
+static void
+ebitset_or (dst, src1, src2)
+ bitset dst;
+ bitset src1;
+ bitset src2;
+{
+ ebitset_or_cmp (dst, src1, src2);
+}
+
+
+static int
+ebitset_or_cmp (dst, src1, src2)
+ bitset dst;
+ bitset src1;
+ bitset src2;
+{
+ if (EBITSET_ZERO_P (src2))
+ {
+ return ebitset_copy_cmp (dst, src1);
+ }
+ else if (EBITSET_ZERO_P (src1))
{
- case BITSET_OR_AND:
- bitset_or (tmp, src1, src2);
- changed = bitset_and (dst, src3, tmp);
- break;
+ return ebitset_copy_cmp (dst, src2);
+ }
+ return ebitset_op3_cmp (dst, src1, src2, BITSET_OP_OR);
+}
- case BITSET_AND_OR:
- bitset_and (tmp, src1, src2);
- changed = bitset_or (dst, src3, tmp);
- break;
- case BITSET_ANDN_OR:
- bitset_andn (tmp, src1, src2);
- changed = bitset_or (dst, src3, tmp);
- break;
+static void
+ebitset_xor (dst, src1, src2)
+ bitset dst;
+ bitset src1;
+ bitset src2;
+{
+ ebitset_xor_cmp (dst, src1, src2);
+}
- default:
- abort ();
+
+static int
+ebitset_xor_cmp (dst, src1, src2)
+ bitset dst;
+ bitset src1;
+ bitset src2;
+{
+ if (EBITSET_ZERO_P (src2))
+ {
+ return ebitset_copy_cmp (dst, src1);
}
+ else if (EBITSET_ZERO_P (src1))
+ {
+ return ebitset_copy_cmp (dst, src2);
+ }
+ return ebitset_op3_cmp (dst, src1, src2, BITSET_OP_XOR);
+}
- bitset_free (tmp);
- EBITSET_NONZERO_SET (dst);
- return changed;
+
+static void
+ebitset_copy (dst, src)
+ bitset dst;
+ bitset src;
+{
+ if (BITSET_COMPATIBLE_ (dst, src))
+ ebitset_copy_ (dst, src);
+ else
+ bitset_copy_ (dst, src);
}
/* Vector of operations for linked-list bitsets. */
-struct bitset_ops_struct ebitset_ops =
- {
- ebitset_set,
- ebitset_reset,
- ebitset_test,
- ebitset_size,
- ebitset_op1,
- ebitset_op2,
- ebitset_op3,
- ebitset_op4,
- ebitset_list,
- ebitset_reverse_list,
- ebitset_free,
- BITSET_TABLE
- };
+struct bitset_vtable ebitset_vtable = {
+ ebitset_set,
+ ebitset_reset,
+ bitset_toggle_,
+ ebitset_test,
+ ebitset_size,
+ bitset_count_,
+ ebitset_empty_p,
+ ebitset_ones,
+ ebitset_zero,
+ ebitset_copy,
+ ebitset_disjoint_p,
+ ebitset_equal_p,
+ ebitset_not,
+ ebitset_subset_p,
+ ebitset_and,
+ ebitset_and_cmp,
+ ebitset_andn,
+ ebitset_andn_cmp,
+ ebitset_or,
+ ebitset_or_cmp,
+ ebitset_xor,
+ ebitset_xor_cmp,
+ bitset_and_or_,
+ bitset_and_or_cmp_,
+ bitset_andn_or_,
+ bitset_andn_or_cmp_,
+ bitset_or_and_,
+ bitset_or_and_cmp_,
+ ebitset_list,
+ ebitset_list_reverse,
+ ebitset_free,
+ BITSET_TABLE
+};
/* Return size of initial structure. */
-int
+size_t
ebitset_bytes (n_bits)
bitset_bindex n_bits ATTRIBUTE_UNUSED;
{
- return sizeof (struct bitset_struct);
+ return sizeof (struct ebitset_struct);
}
bitset bset;
bitset_bindex n_bits;
{
- unsigned int size;
+ bitset_windex size;
- bset->ops = &ebitset_ops;
+ bset->b.vtable = &ebitset_vtable;
- bset->csize = EBITSET_ELT_WORDS;
+ bset->b.csize = EBITSET_ELT_WORDS;
EBITSET_ZERO_SET (bset);
projects / bison.git / blobdiff