X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/75f10004fe0e192304073e4f65909aa43439ee79..0fe9720964da510a2b359af390a3053aace65f9f:/lib/ebitset.c
diff --git a/lib/ebitset.c b/lib/ebitset.c
index 11b02c84..77cc7a01 100644
--- a/lib/ebitset.c
+++ b/lib/ebitset.c
@@ -1,10 +1,12 @@
/* Functions to support expandable bitsets.
- Copyright (C) 2002 Free Software Foundation, Inc.
+
+ Copyright (C) 2002-2006, 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,
@@ -13,17 +15,15 @@
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 . */
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+#include
#include "ebitset.h"
+
#include "obstack.h"
#include
+#include
/* This file implements expandable bitsets. These bitsets can be of
arbitrary length and are more efficient than arrays of bits for
@@ -51,14 +51,14 @@
/* Number of bits stored in each element. */
#define EBITSET_ELT_BITS \
- ((unsigned) (EBITSET_ELT_WORDS * BITSET_WORD_BITS))
+ ((unsigned int) (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. */
+ bitset_word words[EBITSET_ELT_WORDS]; /* Bits that are set. */
struct ebitset_elt_struct *next;
}
u;
@@ -75,11 +75,6 @@ typedef ebitset_elt *ebitset_elts;
#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 };
@@ -88,18 +83,20 @@ 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 bool ebitset_obstack_init = false;
+static ebitset_elt *ebitset_free_list; /* Free list of bitset elements. */
+#define EBITSET_N_ELTS(N) (((N) + EBITSET_ELT_BITS - 1) / EBITSET_ELT_BITS)
#define EBITSET_ELTS(BSET) ((BSET)->e.elts)
-#define EBITSET_SIZE(BSET) ((BSET)->e.size)
+#define EBITSET_SIZE(BSET) EBITSET_N_ELTS (BITSET_NBITS_ (BSET))
+#define EBITSET_ASIZE(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)->b.cindex = BITSET_WINDEX_MAX, \
- (BSET)->b.cdata = 0)
+ (BSET)->b.cdata = 0)
#define EBITSET_CACHE_DISABLE(BSET) ((BSET)->b.cindex = BITSET_WINDEX_MAX)
@@ -117,25 +114,65 @@ static ebitset_elt *ebitset_free_list; /* Free list of bitset elements. */
((BSET)->b.cindex = (EINDEX) * EBITSET_ELT_WORDS, \
(BSET)->b.cdata = EBITSET_WORDS (EBITSET_ELTS (BSET) [EINDEX]))
+#undef min
+#undef max
+#define min(a, b) ((a) > (b) ? (b) : (a))
+#define max(a, b) ((a) > (b) ? (a) : (b))
-/* Grow the expandable table for BSET by SIZE elements. */
-static void
-ebitset_elts_grow (bitset bset, bitset_windex size)
+static bitset_bindex
+ebitset_resize (bitset src, bitset_bindex n_bits)
{
bitset_windex oldsize;
bitset_windex newsize;
- oldsize = EBITSET_SIZE (bset);
- newsize = oldsize + size;
+ if (n_bits == BITSET_NBITS_ (src))
+ return n_bits;
- if (BITSET_SIZE_MAX / sizeof (ebitset_elt *) < newsize)
- xalloc_die ();
+ oldsize = EBITSET_SIZE (src);
+ newsize = EBITSET_N_ELTS (n_bits);
- EBITSET_ELTS (bset) = xrealloc (EBITSET_ELTS (bset),
- newsize * sizeof (ebitset_elt *));
- EBITSET_SIZE (bset) = newsize;
+ if (oldsize < newsize)
+ {
+ bitset_windex size;
+
+ /* The bitset needs to grow. If we already have enough memory
+ allocated, then just zero what we need. */
+ if (newsize > EBITSET_ASIZE (src))
+ {
+ /* We need to allocate more memory. When oldsize is
+ non-zero this means that we are changing the size, so
+ grow the bitset 25% larger than requested to reduce
+ number of reallocations. */
+
+ if (oldsize == 0)
+ size = newsize;
+ else
+ size = newsize + newsize / 4;
+
+ EBITSET_ELTS (src)
+ = realloc (EBITSET_ELTS (src), size * sizeof (ebitset_elt *));
+ EBITSET_ASIZE (src) = size;
+ }
+
+ memset (EBITSET_ELTS (src) + oldsize, 0,
+ (newsize - oldsize) * sizeof (ebitset_elt *));
+ }
+ else
+ {
+ /* The bitset needs to shrink. There's no point deallocating
+ the memory unless it is shrinking by a reasonable amount. */
+ if ((oldsize - newsize) >= oldsize / 2)
+ {
+ EBITSET_ELTS (src)
+ = realloc (EBITSET_ELTS (src), newsize * sizeof (ebitset_elt *));
+ EBITSET_ASIZE (src) = newsize;
+ }
+
+ /* Need to prune any excess bits. FIXME. */
+ }
- memset (EBITSET_ELTS (bset) + oldsize, 0, size * sizeof (ebitset_elt *));
+ BITSET_NBITS_ (src) = n_bits;
+ return n_bits;
}
@@ -153,16 +190,16 @@ ebitset_elt_alloc (void)
else
{
if (!ebitset_obstack_init)
- {
- ebitset_obstack_init = 1;
+ {
+ ebitset_obstack_init = true;
- /* Let particular systems override the size of a chunk. */
+ /* 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. */
+ /* Let them override the alloc and free routines too. */
#ifndef OBSTACK_CHUNK_ALLOC
#define OBSTACK_CHUNK_ALLOC xmalloc
@@ -172,22 +209,20 @@ ebitset_elt_alloc (void)
#define OBSTACK_CHUNK_FREE free
#endif
-#if !defined(__GNUC__) || (__GNUC__ < 2)
+#if ! defined __GNUC__ || __GNUC__ < 2
#define __alignof__(type) 0
#endif
- obstack_specify_allocation (&ebitset_obstack, OBSTACK_CHUNK_SIZE,
- __alignof__ (ebitset_elt),
- (void *(*)PARAMS ((long)))
- OBSTACK_CHUNK_ALLOC,
- (void (*)PARAMS ((void *)))
- OBSTACK_CHUNK_FREE);
- }
+ obstack_specify_allocation (&ebitset_obstack, OBSTACK_CHUNK_SIZE,
+ __alignof__ (ebitset_elt),
+ OBSTACK_CHUNK_ALLOC,
+ 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));
+ sizeof (ebitset_elt));
}
return elt;
@@ -242,30 +277,30 @@ ebitset_elt_add (bitset bset, ebitset_elt *elt, bitset_windex eindex)
}
-/* Return nonzero if all bits in an element are zero. */
-static inline int
+/* Are all bits in an element zero? */
+static inline bool
ebitset_elt_zero_p (ebitset_elt *elt)
{
int i;
for (i = 0; i < EBITSET_ELT_WORDS; i++)
if (EBITSET_WORDS (elt)[i])
- return 0;
+ return false;
- return 1;
+ return true;
}
static ebitset_elt *
-ebitset_elt_find (bitset bset, bitset_windex windex,
- enum ebitset_find_mode mode)
+ebitset_elt_find (bitset bset, bitset_bindex bindex,
+ enum ebitset_find_mode mode)
{
ebitset_elt *elt;
bitset_windex size;
bitset_windex eindex;
ebitset_elts *elts;
- eindex = windex / EBITSET_ELT_WORDS;
+ eindex = bindex / EBITSET_ELT_BITS;
elts = EBITSET_ELTS (bset);
size = EBITSET_SIZE (bset);
@@ -273,39 +308,28 @@ ebitset_elt_find (bitset bset, bitset_windex windex,
if (eindex < size)
{
if ((elt = elts[eindex]))
- {
- if (EBITSET_WORDS (elt) == bset->b.cdata)
- return elt;
+ {
+ if (EBITSET_WORDS (elt) == bset->b.cdata)
+ return elt;
- EBITSET_CACHE_SET (bset, eindex);
- return elt;
- }
+ EBITSET_CACHE_SET (bset, eindex);
+ return elt;
+ }
}
/* The element could not be found. */
switch (mode)
{
+ default:
+ abort ();
+
case EBITSET_FIND:
return 0;
case EBITSET_CREATE:
if (eindex >= size)
- {
- bitset_windex extra;
-
- extra = eindex - size + 1;
-
- /* We need to expand the table by EXTRA elements. It may be
- better with large bitsets to grow the number of
- elements by some fraction of the current size otherwise
- we can spend a lot of time slowly increasing the size of the
- bitset. */
- if (extra < EBITSET_GROW_SIZE)
- extra = EBITSET_GROW_SIZE;
-
- ebitset_elts_grow (bset, extra);
- }
+ ebitset_resize (bset, bindex);
/* Create a new element. */
elt = ebitset_elt_calloc ();
@@ -315,25 +339,10 @@ ebitset_elt_find (bitset bset, bitset_windex windex,
case EBITSET_SUBST:
return &ebitset_zero_elts[0];
-
- default:
- abort ();
}
}
-static inline ebitset_elt *
-ebitset_elt_last (bitset bset)
-{
- ebitset_elts *elts;
-
- elts = EBITSET_ELTS (bset);
-
- /* Assume that have at least one element in elts. */
- return elts[EBITSET_SIZE (bset) - 1];
-}
-
-
/* Weed out the zero elements from the elts. */
static inline bitset_windex
ebitset_weed (bitset bset)
@@ -352,22 +361,22 @@ ebitset_weed (bitset bset)
ebitset_elt *elt = elts[j];
if (elt)
- {
- if (elt && ebitset_elt_zero_p (elt))
- {
- ebitset_elt_remove (bset, j);
- count++;
- }
- }
+ {
+ if (ebitset_elt_zero_p (elt))
+ {
+ ebitset_elt_remove (bset, j);
+ count++;
+ }
+ }
else
- count++;
+ count++;
}
count = j - count;
if (!count)
{
/* All the bits are zero. We could shrink the elts.
- For now just mark BSET as known to be zero. */
+ For now just mark BSET as known to be zero. */
EBITSET_ZERO_SET (bset);
}
else
@@ -393,7 +402,7 @@ ebitset_zero (bitset bset)
ebitset_elt *elt = elts[j];
if (elt)
- ebitset_elt_remove (bset, j);
+ ebitset_elt_remove (bset, j);
}
/* All the bits are zero. We could shrink the elts.
@@ -402,7 +411,7 @@ ebitset_zero (bitset bset)
}
-static inline int
+static inline bool
ebitset_equal_p (bitset dst, bitset src)
{
ebitset_elts *selts;
@@ -410,13 +419,13 @@ ebitset_equal_p (bitset dst, bitset src)
bitset_windex j;
if (src == dst)
- return 1;
+ return true;
ebitset_weed (dst);
ebitset_weed (src);
if (EBITSET_SIZE (src) != EBITSET_SIZE (dst))
- return 0;
+ return false;
selts = EBITSET_ELTS (src);
delts = EBITSET_ELTS (dst);
@@ -428,15 +437,15 @@ ebitset_equal_p (bitset dst, bitset src)
ebitset_elt *delt = delts[j];
if (!selt && !delt)
- continue;
+ continue;
if ((selt && !delt) || (!selt && delt))
- return 0;
+ return false;
for (i = 0; i < EBITSET_ELT_WORDS; i++)
- if (EBITSET_WORDS (selt)[i] != EBITSET_WORDS (delt)[i])
- return 0;
+ if (EBITSET_WORDS (selt)[i] != EBITSET_WORDS (delt)[i])
+ return false;
}
- return 1;
+ return true;
}
@@ -453,8 +462,8 @@ ebitset_copy_ (bitset dst, bitset src)
ebitset_zero (dst);
- if (EBITSET_SIZE (dst) < EBITSET_SIZE (src))
- ebitset_elts_grow (dst, EBITSET_SIZE (src) - EBITSET_SIZE (dst));
+ if (BITSET_NBITS_ (dst) != BITSET_NBITS_ (src))
+ ebitset_resize (dst, BITSET_NBITS_ (src));
selts = EBITSET_ELTS (src);
delts = EBITSET_ELTS (dst);
@@ -463,26 +472,26 @@ ebitset_copy_ (bitset dst, bitset src)
ebitset_elt *selt = selts[j];
if (selt)
- {
- ebitset_elt *tmp;
-
- tmp = ebitset_elt_alloc ();
- delts[j] = tmp;
- memcpy (EBITSET_WORDS (tmp), EBITSET_WORDS (selt),
- sizeof (EBITSET_WORDS (selt)));
- }
+ {
+ ebitset_elt *tmp;
+
+ tmp = ebitset_elt_alloc ();
+ delts[j] = tmp;
+ memcpy (EBITSET_WORDS (tmp), EBITSET_WORDS (selt),
+ sizeof (EBITSET_WORDS (selt)));
+ }
}
EBITSET_NONZERO_SET (dst);
}
-/* Copy bits from bitset SRC to bitset DST. Return non-zero if
+/* Copy bits from bitset SRC to bitset DST. Return true if
bitsets different. */
-static inline int
+static inline bool
ebitset_copy_cmp (bitset dst, bitset src)
{
if (src == dst)
- return 0;
+ return false;
if (EBITSET_ZERO_P (dst))
{
@@ -491,19 +500,10 @@ ebitset_copy_cmp (bitset dst, bitset src)
}
if (ebitset_equal_p (dst, src))
- return 0;
+ return false;
ebitset_copy_ (dst, src);
- return 1;
-}
-
-
-/* Return size in bits of bitset SRC. */
-static bitset_bindex
-ebitset_size (bitset src)
-{
- /* Return current size of bitset in bits. */
- return EBITSET_SIZE (src) * EBITSET_ELT_BITS;
+ return true;
}
@@ -513,7 +513,7 @@ ebitset_set (bitset dst, bitset_bindex bitno)
{
bitset_windex windex = bitno / BITSET_WORD_BITS;
- ebitset_elt_find (dst, windex, EBITSET_CREATE);
+ ebitset_elt_find (dst, bitno, EBITSET_CREATE);
dst->b.cdata[windex - dst->b.cindex] |=
(bitset_word) 1 << (bitno % BITSET_WORD_BITS);
@@ -526,7 +526,7 @@ ebitset_reset (bitset dst, bitset_bindex bitno)
{
bitset_windex windex = bitno / BITSET_WORD_BITS;
- if (!ebitset_elt_find (dst, windex, EBITSET_FIND))
+ if (!ebitset_elt_find (dst, bitno, EBITSET_FIND))
return;
dst->b.cdata[windex - dst->b.cindex] &=
@@ -539,16 +539,15 @@ ebitset_reset (bitset dst, bitset_bindex bitno)
/* Test bit BITNO in bitset SRC. */
-static int
+static bool
ebitset_test (bitset src, bitset_bindex bitno)
{
bitset_windex windex = bitno / BITSET_WORD_BITS;
- if (!ebitset_elt_find (src, windex, EBITSET_FIND))
- return 0;
-
- return (src->b.
- cdata[windex - src->b.cindex] >> (bitno % BITSET_WORD_BITS)) & 1;
+ return (ebitset_elt_find (src, bitno, EBITSET_FIND)
+ && ((src->b.cdata[windex - src->b.cindex]
+ >> (bitno % BITSET_WORD_BITS))
+ & 1));
}
@@ -565,7 +564,7 @@ ebitset_free (bitset bset)
found and with *NEXT indicating where search stopped. */
static bitset_bindex
ebitset_list_reverse (bitset bset, bitset_bindex *list,
- bitset_bindex num, bitset_bindex *next)
+ bitset_bindex num, bitset_bindex *next)
{
bitset_bindex n_bits;
bitset_bindex bitno;
@@ -611,33 +610,33 @@ ebitset_list_reverse (bitset bset, bitset_bindex *list,
elt = elts[eindex];
if (elt)
- {
- srcp = EBITSET_WORDS (elt);
-
- do
- {
- bitset_word word;
-
- word = srcp[woffset] << (BITSET_WORD_BITS - 1 - bcount);
-
- for (; word; bcount--)
- {
- if (word & BITSET_MSB)
- {
- list[count++] = boffset + bcount;
- if (count >= num)
- {
- *next = n_bits - (boffset + bcount);
- return count;
- }
- }
- word <<= 1;
- }
- boffset -= BITSET_WORD_BITS;
- bcount = BITSET_WORD_BITS - 1;
- }
- while (woffset--);
- }
+ {
+ srcp = EBITSET_WORDS (elt);
+
+ do
+ {
+ bitset_word word;
+
+ word = srcp[woffset] << (BITSET_WORD_BITS - 1 - bcount);
+
+ for (; word; bcount--)
+ {
+ if (word & BITSET_MSB)
+ {
+ list[count++] = boffset + bcount;
+ if (count >= num)
+ {
+ *next = n_bits - (boffset + bcount);
+ return count;
+ }
+ }
+ word <<= 1;
+ }
+ boffset -= BITSET_WORD_BITS;
+ bcount = BITSET_WORD_BITS - 1;
+ }
+ while (woffset--);
+ }
woffset = EBITSET_ELT_WORDS - 1;
boffset = eindex * EBITSET_ELT_BITS - BITSET_WORD_BITS;
@@ -654,7 +653,7 @@ ebitset_list_reverse (bitset bset, bitset_bindex *list,
found and with *NEXT indicating where search stopped. */
static bitset_bindex
ebitset_list (bitset bset, bitset_bindex *list,
- bitset_bindex num, bitset_bindex *next)
+ bitset_bindex num, bitset_bindex *next)
{
bitset_bindex bitno;
bitset_windex windex;
@@ -681,33 +680,33 @@ ebitset_list (bitset bset, bitset_bindex *list,
elt = elts[eindex];
if (elt)
- {
- bitset_windex woffset;
- bitset_word *srcp = EBITSET_WORDS (elt);
-
- windex = bitno / BITSET_WORD_BITS;
- woffset = eindex * EBITSET_ELT_WORDS;
-
- for (; (windex - woffset) < EBITSET_ELT_WORDS; windex++)
- {
- word = srcp[windex - woffset] >> (bitno % BITSET_WORD_BITS);
-
- for (; word; bitno++)
- {
- if (word & 1)
- {
- list[count++] = bitno;
- if (count >= num)
- {
- *next = bitno + 1;
- return count;
- }
- }
- word >>= 1;
- }
- bitno = (windex + 1) * BITSET_WORD_BITS;
- }
- }
+ {
+ bitset_windex woffset;
+ bitset_word *srcp = EBITSET_WORDS (elt);
+
+ windex = bitno / BITSET_WORD_BITS;
+ woffset = eindex * EBITSET_ELT_WORDS;
+
+ for (; (windex - woffset) < EBITSET_ELT_WORDS; windex++)
+ {
+ word = srcp[windex - woffset] >> (bitno % BITSET_WORD_BITS);
+
+ for (; word; bitno++)
+ {
+ if (word & 1)
+ {
+ list[count++] = bitno;
+ if (count >= num)
+ {
+ *next = bitno + 1;
+ return count;
+ }
+ }
+ word >>= 1;
+ }
+ bitno = (windex + 1) * BITSET_WORD_BITS;
+ }
+ }
/* Skip to next element. */
eindex++;
@@ -723,65 +722,108 @@ ebitset_list (bitset bset, bitset_bindex *list,
elt = elts[eindex];
if (!elt)
- continue;
+ continue;
srcp = EBITSET_WORDS (elt);
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++, windex++)
- {
- bitno = windex * BITSET_WORD_BITS;
-
- word = srcp[i];
- if (word)
- {
- if (!(word & 0xffff))
- {
- word >>= 16;
- bitno += 16;
- }
- if (!(word & 0xff))
- {
- word >>= 8;
- bitno += 8;
- }
- for (; word; bitno++)
- {
- if (word & 1)
- list[count++] = bitno;
- word >>= 1;
- }
- }
- }
- }
+ {
+ /* The coast is clear, plant boot! */
+
+#if EBITSET_ELT_WORDS == 2
+ word = srcp[0];
+ if (word)
+ {
+ if (!(word & 0xffff))
+ {
+ word >>= 16;
+ bitno += 16;
+ }
+ if (!(word & 0xff))
+ {
+ word >>= 8;
+ bitno += 8;
+ }
+ for (; word; bitno++)
+ {
+ if (word & 1)
+ list[count++] = bitno;
+ word >>= 1;
+ }
+ }
+ windex++;
+ bitno = windex * BITSET_WORD_BITS;
+
+ word = srcp[1];
+ if (word)
+ {
+ if (!(word & 0xffff))
+ {
+ word >>= 16;
+ bitno += 16;
+ }
+ for (; word; bitno++)
+ {
+ if (word & 1)
+ list[count++] = bitno;
+ word >>= 1;
+ }
+ }
+ windex++;
+ bitno = windex * BITSET_WORD_BITS;
+#else
+ for (i = 0; i < EBITSET_ELT_WORDS; i++, windex++)
+ {
+ bitno = windex * BITSET_WORD_BITS;
+
+ word = srcp[i];
+ if (word)
+ {
+ if (!(word & 0xffff))
+ {
+ word >>= 16;
+ bitno += 16;
+ }
+ if (!(word & 0xff))
+ {
+ word >>= 8;
+ bitno += 8;
+ }
+ for (; word; bitno++)
+ {
+ if (word & 1)
+ list[count++] = bitno;
+ word >>= 1;
+ }
+ }
+ }
+#endif
+ }
else
- {
- /* Tread more carefully since we need to check
- if array overflows. */
-
- for (i = 0; i < EBITSET_ELT_WORDS; i++, windex++)
- {
- bitno = windex * BITSET_WORD_BITS;
-
- for (word = srcp[i]; word; bitno++)
- {
- if (word & 1)
- {
- list[count++] = bitno;
- if (count >= num)
- {
- *next = bitno + 1;
- return count;
- }
- }
- word >>= 1;
- }
- }
- }
+ {
+ /* Tread more carefully since we need to check
+ if array overflows. */
+
+ for (i = 0; i < EBITSET_ELT_WORDS; i++, windex++)
+ {
+ bitno = windex * BITSET_WORD_BITS;
+
+ for (word = srcp[i]; word; bitno++)
+ {
+ if (word & 1)
+ {
+ list[count++] = bitno;
+ if (count >= num)
+ {
+ *next = bitno + 1;
+ return count;
+ }
+ }
+ word >>= 1;
+ }
+ }
+ }
}
*next = bitno;
@@ -789,29 +831,91 @@ ebitset_list (bitset bset, bitset_bindex *list,
}
+/* Ensure that any unused bits within the last element are clear. */
+static inline void
+ebitset_unused_clear (bitset dst)
+{
+ unsigned int last_bit;
+ bitset_bindex n_bits;
+
+ n_bits = BITSET_NBITS_ (dst);
+ last_bit = n_bits % EBITSET_ELT_BITS;
+
+ if (last_bit)
+ {
+ bitset_windex eindex;
+ ebitset_elts *elts;
+ ebitset_elt *elt;
+
+ elts = EBITSET_ELTS (dst);
+
+ eindex = n_bits / EBITSET_ELT_BITS;
+
+ elt = elts[eindex];
+ if (elt)
+ {
+ bitset_windex windex;
+ bitset_windex woffset;
+ bitset_word *srcp = EBITSET_WORDS (elt);
+
+ windex = n_bits / BITSET_WORD_BITS;
+ woffset = eindex * EBITSET_ELT_WORDS;
+
+ srcp[windex - woffset] &= ((bitset_word) 1 << last_bit) - 1;
+ windex++;
+ for (; (windex - woffset) < EBITSET_ELT_WORDS; windex++)
+ srcp[windex - woffset] = 0;
+ }
+ }
+}
+
+
static void
ebitset_ones (bitset dst)
{
bitset_windex j;
ebitset_elt *elt;
-
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. */
+ we should just add pointers to a ones element? */
elt =
- ebitset_elt_find (dst, j * EBITSET_ELT_WORDS, EBITSET_CREATE);
+ ebitset_elt_find (dst, j * EBITSET_ELT_BITS, EBITSET_CREATE);
memset (EBITSET_WORDS (elt), -1, sizeof (EBITSET_WORDS (elt)));
}
EBITSET_NONZERO_SET (dst);
+ ebitset_unused_clear (dst);
}
-static int
+static bool
ebitset_empty_p (bitset dst)
{
- return !ebitset_weed (dst);
+ ebitset_elts *elts;
+ bitset_windex j;
+
+ if (EBITSET_ZERO_P (dst))
+ return 1;
+
+ elts = EBITSET_ELTS (dst);
+ for (j = 0; j < EBITSET_SIZE (dst); j++)
+ {
+ ebitset_elt *elt = elts[j];
+
+ if (elt)
+ {
+ if (!ebitset_elt_zero_p (elt))
+ return 0;
+ /* Do some weeding as we go. */
+ ebitset_elt_remove (dst, j);
+ }
+ }
+
+ /* All the bits are zero. We could shrink the elts.
+ For now just mark DST as known to be zero. */
+ EBITSET_ZERO_SET (dst);
+ return 1;
}
@@ -823,24 +927,27 @@ ebitset_not (bitset dst, bitset src)
ebitset_elt *delt;
bitset_windex j;
+ ebitset_resize (dst, BITSET_NBITS_ (src));
+
for (j = 0; j < EBITSET_SIZE (src); j++)
{
/* Create new elements for dst if they cannot be found
- or substitute zero elements if src elements not found. */
+ or substitute zero elements if src elements not found. */
selt =
- ebitset_elt_find (dst, j * EBITSET_ELT_WORDS, EBITSET_SUBST);
+ ebitset_elt_find (dst, j * EBITSET_ELT_BITS, EBITSET_SUBST);
delt =
- ebitset_elt_find (dst, j * EBITSET_ELT_WORDS, EBITSET_CREATE);
+ ebitset_elt_find (dst, j * EBITSET_ELT_BITS, EBITSET_CREATE);
for (i = 0; i < EBITSET_ELT_WORDS; i++)
- EBITSET_WORDS (delt)[i] = ~EBITSET_WORDS (selt)[i];
+ EBITSET_WORDS (delt)[i] = ~EBITSET_WORDS (selt)[i];
}
EBITSET_NONZERO_SET (dst);
+ ebitset_unused_clear (dst);
}
-/* Return 1 if DST == DST | SRC. */
-static int
+/* Is DST == DST | SRC? */
+static bool
ebitset_subset_p (bitset dst, bitset src)
{
bitset_windex j;
@@ -865,24 +972,24 @@ ebitset_subset_p (bitset dst, bitset src)
delt = j < dsize ? delts[j] : 0;
if (!selt && !delt)
- continue;
+ continue;
if (!selt)
- selt = &ebitset_zero_elts[0];
+ selt = &ebitset_zero_elts[0];
if (!delt)
- delt = &ebitset_zero_elts[0];
+ 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;
+ if (EBITSET_WORDS (delt)[i]
+ != (EBITSET_WORDS (selt)[i] | EBITSET_WORDS (delt)[i]))
+ return false;
}
- return 1;
+ return true;
}
-/* Return 1 if DST & SRC == 0. */
-static int
+/* Is DST & SRC == 0? */
+static bool
ebitset_disjoint_p (bitset dst, bitset src)
{
bitset_windex j;
@@ -907,18 +1014,18 @@ ebitset_disjoint_p (bitset dst, bitset src)
delt = j < dsize ? delts[j] : 0;
if (!selt || !delt)
- continue;
+ continue;
for (i = 0; i < EBITSET_ELT_WORDS; i++)
- if ((EBITSET_WORDS (selt)[i] & EBITSET_WORDS (delt)[i]))
- return 0;
+ if ((EBITSET_WORDS (selt)[i] & EBITSET_WORDS (delt)[i]))
+ return false;
}
- return 1;
+ return true;
}
-static int
+static bool
ebitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
{
bitset_windex ssize1;
@@ -931,10 +1038,12 @@ ebitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
bitset_word *srcp1;
bitset_word *srcp2;
bitset_word *dstp;
- int changed = 0;
+ bool changed = false;
unsigned int i;
bitset_windex j;
+ ebitset_resize (dst, max (BITSET_NBITS_ (src1), BITSET_NBITS_ (src2)));
+
ssize1 = EBITSET_SIZE (src1);
ssize2 = EBITSET_SIZE (src2);
dsize = EBITSET_SIZE (dst);
@@ -942,9 +1051,6 @@ ebitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
if (size < ssize2)
size = ssize2;
- if (size > dsize)
- ebitset_elts_grow (dst, size - dsize);
-
selts1 = EBITSET_ELTS (src1);
selts2 = EBITSET_ELTS (src2);
delts = EBITSET_ELTS (dst);
@@ -960,93 +1066,93 @@ ebitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
delt = j < dsize ? delts[j] : 0;
if (!selt1 && !selt2)
- {
- if (delt)
- {
- changed = 1;
- ebitset_elt_remove (dst, j);
- }
- continue;
- }
+ {
+ if (delt)
+ {
+ changed = true;
+ ebitset_elt_remove (dst, j);
+ }
+ continue;
+ }
if (!selt1)
- selt1 = &ebitset_zero_elts[0];
+ selt1 = &ebitset_zero_elts[0];
if (!selt2)
- selt2 = &ebitset_zero_elts[0];
+ selt2 = &ebitset_zero_elts[0];
if (!delt)
- delt = ebitset_elt_calloc ();
+ delt = ebitset_elt_calloc ();
else
- delts[j] = 0;
+ delts[j] = 0;
srcp1 = EBITSET_WORDS (selt1);
srcp2 = EBITSET_WORDS (selt2);
dstp = EBITSET_WORDS (delt);
switch (op)
- {
- case BITSET_OP_OR:
- for (i = 0; i < EBITSET_ELT_WORDS; i++, dstp++)
- {
- bitset_word tmp = *srcp1++ | *srcp2++;
-
- if (*dstp != tmp)
- {
- changed = 1;
- *dstp = tmp;
- }
- }
- break;
-
- case BITSET_OP_AND:
- for (i = 0; i < EBITSET_ELT_WORDS; i++, dstp++)
- {
- bitset_word tmp = *srcp1++ & *srcp2++;
-
- if (*dstp != tmp)
- {
- changed = 1;
- *dstp = tmp;
- }
- }
- break;
-
- case BITSET_OP_XOR:
- for (i = 0; i < EBITSET_ELT_WORDS; i++, dstp++)
- {
- bitset_word tmp = *srcp1++ ^ *srcp2++;
-
- if (*dstp != tmp)
- {
- changed = 1;
- *dstp = tmp;
- }
- }
- break;
-
- case BITSET_OP_ANDN:
- for (i = 0; i < EBITSET_ELT_WORDS; i++, dstp++)
- {
- bitset_word tmp = *srcp1++ & ~(*srcp2++);
-
- if (*dstp != tmp)
- {
- changed = 1;
- *dstp = tmp;
- }
- }
- break;
-
- default:
- abort ();
- }
+ {
+ default:
+ abort ();
+
+ case BITSET_OP_OR:
+ for (i = 0; i < EBITSET_ELT_WORDS; i++, dstp++)
+ {
+ bitset_word tmp = *srcp1++ | *srcp2++;
+
+ if (*dstp != tmp)
+ {
+ changed = true;
+ *dstp = tmp;
+ }
+ }
+ break;
+
+ case BITSET_OP_AND:
+ for (i = 0; i < EBITSET_ELT_WORDS; i++, dstp++)
+ {
+ bitset_word tmp = *srcp1++ & *srcp2++;
+
+ if (*dstp != tmp)
+ {
+ changed = true;
+ *dstp = tmp;
+ }
+ }
+ break;
+
+ case BITSET_OP_XOR:
+ for (i = 0; i < EBITSET_ELT_WORDS; i++, dstp++)
+ {
+ bitset_word tmp = *srcp1++ ^ *srcp2++;
+
+ if (*dstp != tmp)
+ {
+ changed = true;
+ *dstp = tmp;
+ }
+ }
+ break;
+
+ case BITSET_OP_ANDN:
+ for (i = 0; i < EBITSET_ELT_WORDS; i++, dstp++)
+ {
+ bitset_word tmp = *srcp1++ & ~(*srcp2++);
+
+ if (*dstp != tmp)
+ {
+ changed = true;
+ *dstp = tmp;
+ }
+ }
+ break;
+ }
if (!ebitset_elt_zero_p (delt))
- {
- ebitset_elt_add (dst, delt, j);
- }
+ {
+ ebitset_elt_add (dst, delt, j);
+ }
else
- {
- ebitset_elt_free (delt);
- }
+ {
+ ebitset_elt_free (delt);
+ }
}
/* If we have elements of DST left over, free them all. */
@@ -1054,12 +1160,12 @@ ebitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
{
ebitset_elt *delt;
- changed = 1;
+ changed = true;
delt = delts[j];
if (delt)
- ebitset_elt_remove (dst, j);
+ ebitset_elt_remove (dst, j);
}
EBITSET_NONZERO_SET (dst);
@@ -1067,10 +1173,10 @@ ebitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
}
-static int
+static bool
ebitset_and_cmp (bitset dst, bitset src1, bitset src2)
{
- int changed;
+ bool changed;
if (EBITSET_ZERO_P (src2))
{
@@ -1097,10 +1203,10 @@ ebitset_and (bitset dst, bitset src1, bitset src2)
}
-static int
+static bool
ebitset_andn_cmp (bitset dst, bitset src1, bitset src2)
{
- int changed;
+ bool changed;
if (EBITSET_ZERO_P (src2))
{
@@ -1124,7 +1230,7 @@ ebitset_andn (bitset dst, bitset src1, bitset src2)
}
-static int
+static bool
ebitset_or_cmp (bitset dst, bitset src1, bitset src2)
{
if (EBITSET_ZERO_P (src2))
@@ -1146,7 +1252,7 @@ ebitset_or (bitset dst, bitset src1, bitset src2)
}
-static int
+static bool
ebitset_xor_cmp (bitset dst, bitset src1, bitset src2)
{
if (EBITSET_ZERO_P (src2))
@@ -1184,7 +1290,8 @@ struct bitset_vtable ebitset_vtable = {
ebitset_reset,
bitset_toggle_,
ebitset_test,
- ebitset_size,
+ ebitset_resize,
+ bitset_size_,
bitset_count_,
ebitset_empty_p,
ebitset_ones,
@@ -1228,20 +1335,15 @@ ebitset_bytes (bitset_bindex n_bits ATTRIBUTE_UNUSED)
bitset
ebitset_init (bitset bset, bitset_bindex n_bits)
{
- bitset_windex size;
-
bset->b.vtable = &ebitset_vtable;
bset->b.csize = EBITSET_ELT_WORDS;
EBITSET_ZERO_SET (bset);
- size = n_bits ? (n_bits + EBITSET_ELT_BITS - 1) / EBITSET_ELT_BITS
- : EBITSET_INITIAL_SIZE;
-
- EBITSET_SIZE (bset) = 0;
+ EBITSET_ASIZE (bset) = 0;
EBITSET_ELTS (bset) = 0;
- ebitset_elts_grow (bset, size);
+ ebitset_resize (bset, n_bits);
return bset;
}
@@ -1253,7 +1355,7 @@ ebitset_release_memory (void)
ebitset_free_list = 0;
if (ebitset_obstack_init)
{
- ebitset_obstack_init = 0;
+ ebitset_obstack_init = false;
obstack_free (&ebitset_obstack, NULL);
}
}