/* Functions to support link list bitsets.
- Copyright (C) 2002 Free Software Foundation, Inc.
+
+ Copyright (C) 2002, 2003, 2004, 2006, 2009, 2010 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,
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 "lbitset.h"
+
#include "obstack.h"
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
+#include <string.h>
/* This file implements linked-list bitsets. These bitsets can be of
arbitrary length and are more efficient than arrays of bits for
/* Number of words to use for each element. The larger the value the
greater the size of the cache and the shorter the time to find a given bit
but the more memory wasted for sparse bitsets and the longer the time
- to search for set bits. */
+ to search for set bits.
+
+ The routines that dominate timing profiles are lbitset_elt_find
+ and lbitset_elt_link, especially when accessing the bits randomly. */
#define LBITSET_ELT_WORDS 2
/* Number of bits stored in each element. */
#define LBITSET_ELT_BITS \
- ((unsigned) (LBITSET_ELT_WORDS * LBITSET_WORD_BITS))
+ ((unsigned int) (LBITSET_ELT_WORDS * LBITSET_WORD_BITS))
/* Lbitset element. We use an array of bits for each element.
These are linked together in a doubly-linked list. */
/* Obstack to allocate bitset elements from. */
static struct obstack lbitset_obstack;
-static int lbitset_obstack_init = 0;
+static bool lbitset_obstack_init = false;
static lbitset_elt *lbitset_free_list; /* Free list of bitset elements. */
-extern void debug_lbitset PARAMS ((bitset));
+extern void debug_lbitset (bitset);
#define LBITSET_CURRENT1(X) \
((lbitset_elt *) (void *) ((char *) (X) - offsetof (lbitset_elt, words)))
{
if (!lbitset_obstack_init)
{
- lbitset_obstack_init = 1;
+ lbitset_obstack_init = true;
/* Let particular systems override the size of a chunk. */
#define OBSTACK_CHUNK_FREE free
#endif
-#if !defined(__GNUC__) || (__GNUC__ < 2)
+#if ! defined __GNUC__ || __GNUC__ < 2
#define __alignof__(type) 0
#endif
obstack_specify_allocation (&lbitset_obstack, OBSTACK_CHUNK_SIZE,
__alignof__ (lbitset_elt),
- (void *(*)PARAMS ((long)))
OBSTACK_CHUNK_ALLOC,
- (void (*)PARAMS ((void *)))
OBSTACK_CHUNK_FREE);
}
}
-/* Return nonzero if all bits in an element are zero. */
-static inline int
+/* Are all bits in an element zero? */
+static inline bool
lbitset_elt_zero_p (lbitset_elt *elt)
{
int i;
for (i = 0; i < LBITSET_ELT_WORDS; i++)
if (elt->words[i])
- return 0;
+ return false;
- return 1;
+ return true;
}
switch (mode)
{
+ default:
+ abort ();
+
case LBITSET_FIND:
return 0;
case LBITSET_SUBST:
return &lbitset_zero_elts[0];
-
- default:
- abort ();
}
}
}
-/* Return 1 if DST == SRC. */
-static inline int
+/* Is DST == SRC? */
+static inline bool
lbitset_equal_p (bitset dst, bitset src)
{
lbitset_elt *selt;
int j;
if (src == dst)
- return 1;
+ return true;
lbitset_weed (src);
lbitset_weed (dst);
selt && delt; selt = selt->next, delt = delt->next)
{
if (selt->index != delt->index)
- return 0;
+ return false;
for (j = 0; j < LBITSET_ELT_WORDS; j++)
if (delt->words[j] != selt->words[j])
- return 0;
+ return false;
}
return !selt && !delt;
}
}
-/* 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
lbitset_copy_cmp (bitset dst, bitset src)
{
if (src == dst)
- return 0;
+ return false;
if (!LBITSET_HEAD (dst))
{
}
if (lbitset_equal_p (dst, src))
- return 0;
+ return false;
lbitset_copy (dst, src);
- return 1;
+ return true;
}
-/* Return size in bits of bitset SRC. */
static bitset_bindex
-lbitset_size (bitset src)
+lbitset_resize (bitset src, bitset_bindex size)
{
- lbitset_elt *elt;
-
- elt = LBITSET_TAIL (src);
- if (!elt)
- return 0;
+ BITSET_NBITS_ (src) = size;
- /* Return current size of bitset in bits. */
- return (elt->index + LBITSET_ELT_WORDS) * BITSET_WORD_BITS;
+ /* Need to prune any excess bits. FIXME. */
+ return size;
}
-
/* Set bit BITNO in bitset DST. */
static void
lbitset_set (bitset dst, bitset_bindex bitno)
/* Test bit BITNO in bitset SRC. */
-static int
+static bool
lbitset_test (bitset src, bitset_bindex bitno)
{
bitset_windex windex = bitno / BITSET_WORD_BITS;
- if (!lbitset_elt_find (src, windex, LBITSET_FIND))
- return 0;
-
- return (src->b.cdata[windex - src->b.cindex]
- >> (bitno % BITSET_WORD_BITS)) & 1;
+ return (lbitset_elt_find (src, windex, LBITSET_FIND)
+ && ((src->b.cdata[windex - src->b.cindex]
+ >> (bitno % BITSET_WORD_BITS))
+ & 1));
}
}
-static int
+static bool
lbitset_empty_p (bitset dst)
{
- lbitset_weed (dst);
- if (LBITSET_HEAD (dst))
- return 0;
+ lbitset_elt *elt;
+ lbitset_elt *next;
+
+ for (elt = LBITSET_HEAD (dst); elt; elt = next)
+ {
+ next = elt->next;
+ if (!lbitset_elt_zero_p (elt))
+ return 0;
+ /* Weed as we go. */
+ lbitset_elt_unlink (dst, elt);
+ }
+
return 1;
}
+/* Ensure that any unused bits within the last element are clear. */
+static inline void
+lbitset_unused_clear (bitset dst)
+{
+ unsigned int last_bit;
+ bitset_bindex n_bits;
+
+ n_bits = BITSET_SIZE_ (dst);
+ last_bit = n_bits % LBITSET_ELT_BITS;
+
+ if (last_bit)
+ {
+ lbitset_elt *elt;
+ bitset_windex windex;
+ bitset_word *srcp;
+
+ elt = LBITSET_TAIL (dst);
+ srcp = elt->words;
+ windex = n_bits / BITSET_WORD_BITS;
+
+ srcp[windex - elt->index] &= ((bitset_word) 1 << last_bit) - 1;
+ windex++;
+
+ for (; (windex - elt->index) < LBITSET_ELT_WORDS; windex++)
+ srcp[windex - elt->index] = 0;
+ }
+}
+
+
static void
lbitset_ones (bitset dst)
{
bitset! It makes a sparse bitset become dense. An alternative
is to have a flag that indicates that the bitset stores the
complement of what it indicates. */
- elt = LBITSET_TAIL (dst);
- /* Ignore empty set. */
- if (!elt)
- return;
- windex = elt->index;
+ windex = (BITSET_SIZE_ (dst) + BITSET_WORD_BITS - 1) / BITSET_WORD_BITS;
+
for (i = 0; i < windex; i += LBITSET_ELT_WORDS)
{
/* Create new elements if they cannot be found. */
elt = lbitset_elt_find (dst, i, LBITSET_CREATE);
memset (elt->words, -1, sizeof (elt->words));
}
+
+ lbitset_unused_clear (dst);
}
/* This is another unfriendly operation for a linked list
bitset! */
elt = LBITSET_TAIL (dst);
- /* Ignore empty set. */
- if (!elt)
- return;
- windex = elt->index;
+ windex = (BITSET_SIZE_ (dst) + BITSET_WORD_BITS - 1) / BITSET_WORD_BITS;
+
for (i = 0; i < windex; i += LBITSET_ELT_WORDS)
{
/* Create new elements for dst if they cannot be found
for (j = 0; j < LBITSET_ELT_WORDS; j++)
delt->words[j] = ~selt->words[j];
}
+ lbitset_unused_clear (dst);
lbitset_weed (dst);
return;
}
-/* Return 1 if DST == DST | SRC. */
-static int
+/* Is DST == DST | SRC? */
+static bool
lbitset_subset_p (bitset dst, bitset src)
{
lbitset_elt *selt;
for (j = 0; j < LBITSET_ELT_WORDS; j++)
if (delt->words[j] != (selt->words[j] | delt->words[j]))
- return 0;
+ return false;
}
- return 1;
+ return true;
}
-/* Return 1 if DST & SRC == 0. */
-static int
+/* Is DST & SRC == 0? */
+static bool
lbitset_disjoint_p (bitset dst, bitset src)
{
lbitset_elt *selt;
for (j = 0; j < LBITSET_ELT_WORDS; j++)
if (selt->words[j] & delt->words[j])
- return 0;
+ return false;
}
- return 1;
+ return true;
}
-static int
+static bool
lbitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
{
lbitset_elt *selt1 = LBITSET_HEAD (src1);
bitset_word *srcp1;
bitset_word *srcp2;
bitset_word *dstp;
- int changed = 0;
+ bool changed = false;
unsigned int i;
LBITSET_HEAD (dst) = 0;
elements that we've skipped. */
while (delt && delt->index < windex)
{
- changed = 1;
+ changed = true;
dtmp = delt;
delt = delt->next;
lbitset_elt_free (dtmp);
dstp = dtmp->words;
switch (op)
{
+ default:
+ abort ();
+
case BITSET_OP_OR:
for (i = 0; i < LBITSET_ELT_WORDS; i++, dstp++)
{
if (*dstp != tmp)
{
- changed = 1;
+ changed = true;
*dstp = tmp;
}
}
if (*dstp != tmp)
{
- changed = 1;
+ changed = true;
*dstp = tmp;
}
}
if (*dstp != tmp)
{
- changed = 1;
+ changed = true;
*dstp = tmp;
}
}
if (*dstp != tmp)
{
- changed = 1;
+ changed = true;
*dstp = tmp;
}
}
break;
-
- default:
- abort ();
}
if (!lbitset_elt_zero_p (dtmp))
/* If we have elements of DST left over, free them all. */
if (delt)
{
- changed = 1;
+ changed = true;
lbitset_prune (dst, delt);
}
}
-static int
+static bool
lbitset_and_cmp (bitset dst, bitset src1, bitset src2)
{
lbitset_elt *selt1 = LBITSET_HEAD (src1);
lbitset_elt *selt2 = LBITSET_HEAD (src2);
- int changed;
+ bool changed;
if (!selt2)
{
}
-static int
+static bool
lbitset_andn_cmp (bitset dst, bitset src1, bitset src2)
{
lbitset_elt *selt1 = LBITSET_HEAD (src1);
lbitset_elt *selt2 = LBITSET_HEAD (src2);
- int changed;
+ bool changed;
if (!selt2)
{
}
-static int
+static bool
lbitset_or_cmp (bitset dst, bitset src1, bitset src2)
{
lbitset_elt *selt1 = LBITSET_HEAD (src1);
}
-static int
+static bool
lbitset_xor_cmp (bitset dst, bitset src1, bitset src2)
{
lbitset_elt *selt1 = LBITSET_HEAD (src1);
lbitset_reset,
bitset_toggle_,
lbitset_test,
- lbitset_size,
+ lbitset_resize,
+ bitset_size_,
bitset_count_,
lbitset_empty_p,
lbitset_ones,
bitset
lbitset_init (bitset bset, bitset_bindex n_bits ATTRIBUTE_UNUSED)
{
+ BITSET_NBITS_ (bset) = n_bits;
bset->b.vtable = &lbitset_vtable;
return bset;
}
lbitset_free_list = 0;
if (lbitset_obstack_init)
{
- lbitset_obstack_init = 0;
+ lbitset_obstack_init = false;
obstack_free (&lbitset_obstack, NULL);
}
}
for (elt = LBITSET_HEAD (bset); elt; elt = elt->next)
{
- fprintf (stderr, "Elt %lu\n", (unsigned long) elt->index);
+ fprintf (stderr, "Elt %lu\n", (unsigned long int) elt->index);
for (i = 0; i < LBITSET_ELT_WORDS; i++)
{
unsigned int j;
projects / bison.git / blobdiff