/* Functions to support link list 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
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. */
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include "bbitset.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. */
-#ifndef LBITSET_ELT_WORDS
#define LBITSET_ELT_WORDS 2
-#endif
typedef bitset_word lbitset_word;
/* 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. */
lbitset_elt;
-/* Head of lbitset linked list. */
-typedef struct lbitset_struct
-{
- lbitset_elt *head; /* First element in linked list. */
- lbitset_elt *tail; /* Last element in linked list. */
-}
-*lbitset;
-
-
-struct bitset_struct
-{
- struct bbitset_struct b;
- struct lbitset_struct l;
-};
-
-
enum lbitset_find_mode
{ LBITSET_FIND, LBITSET_CREATE, LBITSET_SUBST };
-static lbitset_elt lbitset_zero_elts[3]; /* Elements of all zero bits. */
+static lbitset_elt lbitset_zero_elts[3]; /* Elements of all zero bits. */
/* 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. */
-static lbitset_elt *lbitset_elt_alloc PARAMS ((void));
-static lbitset_elt *lbitset_elt_calloc PARAMS ((void));
-static void lbitset_elt_link PARAMS ((bitset, lbitset_elt *));
-static void lbitset_elt_unlink PARAMS ((bitset, lbitset_elt *));
-static void lbitset_elt_free PARAMS ((lbitset_elt *));
-static lbitset_elt *lbitset_elt_find PARAMS ((bitset, bitset_windex,
- enum lbitset_find_mode));
-static int lbitset_elt_zero_p PARAMS ((lbitset_elt *));
-
-static void lbitset_prune PARAMS ((bitset, lbitset_elt *));
-static void lbitset_weed PARAMS ((bitset));
-static void lbitset_zero PARAMS ((bitset));
-static int lbitset_equal_p PARAMS ((bitset, bitset));
-static void lbitset_copy PARAMS ((bitset, bitset));
-static int lbitset_copy_compare PARAMS ((bitset, bitset));
-static void lbitset_set PARAMS ((bitset, bitset_bindex));
-static void lbitset_reset PARAMS ((bitset, bitset_bindex));
-static int lbitset_test PARAMS ((bitset, bitset_bindex));
-static int lbitset_size PARAMS ((bitset));
-static int lbitset_op1 PARAMS ((bitset, enum bitset_ops));
-static int lbitset_op2 PARAMS ((bitset, bitset, enum bitset_ops));
-static int lbitset_op3 PARAMS ((bitset, bitset, bitset, enum bitset_ops));
-static int lbitset_list PARAMS ((bitset, bitset_bindex *, bitset_bindex,
- bitset_bindex *));
-static int lbitset_reverse_list
-PARAMS ((bitset, bitset_bindex *, bitset_bindex, bitset_bindex *));
-static void lbitset_free PARAMS ((bitset));
-
-
-#define LBITSET_CURRENT1(X) (lbitset_elt *)((char *)(X) + ((char *)&(((lbitset_elt *)(X))->next) - (char *)&(((lbitset_elt *)(X))->words)))
+extern void debug_lbitset (bitset);
+
+#define LBITSET_CURRENT1(X) \
+ ((lbitset_elt *) (void *) ((char *) (X) - offsetof (lbitset_elt, words)))
#define LBITSET_CURRENT(X) LBITSET_CURRENT1((X)->b.cdata)
/* Allocate a lbitset element. The bits are not cleared. */
static inline lbitset_elt *
-lbitset_elt_alloc ()
+lbitset_elt_alloc (void)
{
lbitset_elt *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 (!lbitset_obstack_init)
{
- lbitset_obstack_init = 1;
+ lbitset_obstack_init = true;
/* Let particular systems override the size of a chunk. */
obstack_specify_allocation (&lbitset_obstack, OBSTACK_CHUNK_SIZE,
__alignof__ (lbitset_elt),
- (void *(*)PARAMS ((long)))
OBSTACK_CHUNK_ALLOC,
- (void (*)PARAMS ((void *)))
OBSTACK_CHUNK_FREE);
}
}
-/* Allocate a lbitset element. The bits are not cleared. */
+/* Allocate a lbitset element. The bits are cleared. */
static inline lbitset_elt *
-lbitset_elt_calloc ()
+lbitset_elt_calloc (void)
{
lbitset_elt *elt;
static inline void
-lbitset_elt_free (elt)
- lbitset_elt *elt;
+lbitset_elt_free (lbitset_elt *elt)
{
elt->next = lbitset_free_list;
lbitset_free_list = elt;
/* Unlink element ELT from bitset BSET. */
static inline void
-lbitset_elt_unlink (bset, elt)
- bitset bset;
- lbitset_elt *elt;
+lbitset_elt_unlink (bitset bset, lbitset_elt *elt)
{
lbitset_elt *next = elt->next;
lbitset_elt *prev = elt->prev;
/* Cut the chain of bitset BSET before element ELT and free the
elements. */
static inline void
-lbitset_prune (bset, elt)
- bitset bset;
- lbitset_elt *elt;
+lbitset_prune (bitset bset, lbitset_elt *elt)
{
lbitset_elt *next;
}
-/* Return nonzero if all bits in an element are zero. */
-static inline int
-lbitset_elt_zero_p (elt)
- lbitset_elt *elt;
+/* 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;
}
/* Link the bitset element into the current bitset linked list. */
static inline void
-lbitset_elt_link (bset, elt)
- bitset bset;
- lbitset_elt *elt;
+lbitset_elt_link (bitset bset, lbitset_elt *elt)
{
- bitset_windex index = elt->index;
+ bitset_windex windex = elt->index;
lbitset_elt *ptr;
lbitset_elt *current;
/* If this index is less than that of the current element, it goes
somewhere before the current element. */
- else if (index < bset->b.cindex)
+ else if (windex < bset->b.cindex)
{
for (ptr = current;
- ptr->prev && ptr->prev->index > index; ptr = ptr->prev)
+ ptr->prev && ptr->prev->index > windex; ptr = ptr->prev)
continue;
if (ptr->prev)
else
{
for (ptr = current;
- ptr->next && ptr->next->index < index; ptr = ptr->next)
+ ptr->next && ptr->next->index < windex; ptr = ptr->next)
continue;
if (ptr->next)
}
/* Set up so this is the first element searched. */
- bset->b.cindex = index;
+ bset->b.cindex = windex;
bset->b.csize = LBITSET_ELT_WORDS;
bset->b.cdata = elt->words;
}
static lbitset_elt *
-lbitset_elt_find (bset, index, mode)
- bitset bset;
- bitset_windex index;
- enum lbitset_find_mode mode;
+lbitset_elt_find (bitset bset, bitset_windex windex,
+ enum lbitset_find_mode mode)
{
lbitset_elt *elt;
lbitset_elt *current;
{
current = LBITSET_CURRENT (bset);
/* Check if element is the cached element. */
- if ((index - bset->b.cindex) < bset->b.csize)
+ if ((windex - bset->b.cindex) < bset->b.csize)
return current;
}
else
if (current)
{
- if (index < bset->b.cindex)
+ if (windex < bset->b.cindex)
{
for (elt = current;
- elt->prev && elt->index > index; elt = elt->prev)
+ elt->prev && elt->index > windex; elt = elt->prev)
continue;
}
else
{
for (elt = current;
- elt->next && (elt->index + LBITSET_ELT_WORDS - 1) < index;
+ elt->next && (elt->index + LBITSET_ELT_WORDS - 1) < windex;
elt = elt->next)
continue;
}
- /* `element' is the nearest to the one we want. If it's not the one
+ /* ELT is the nearest to the one we want. If it's not the one
we want, the one we want does not exist. */
- if (elt && (index - elt->index) < LBITSET_ELT_WORDS)
+ if (elt && (windex - elt->index) < LBITSET_ELT_WORDS)
{
bset->b.cindex = elt->index;
bset->b.csize = LBITSET_ELT_WORDS;
return 0;
case LBITSET_CREATE:
- index = (index / (unsigned) LBITSET_ELT_WORDS) * LBITSET_ELT_WORDS;
+ windex -= windex % LBITSET_ELT_WORDS;
elt = lbitset_elt_calloc ();
- elt->index = index;
+ elt->index = windex;
lbitset_elt_link (bset, elt);
return elt;
/* Weed out the zero elements from the list. */
static inline void
-lbitset_weed (bset)
- bitset bset;
+lbitset_weed (bitset bset)
{
lbitset_elt *elt;
lbitset_elt *next;
/* Set all bits in the bitset to zero. */
-static inline void
-lbitset_zero (bset)
- bitset bset;
+static void
+lbitset_zero (bitset bset)
{
lbitset_elt *head;
}
-static inline int
-lbitset_equal_p (dst, src)
- bitset dst;
- bitset src;
+/* Is DST == SRC? */
+static inline bool
+lbitset_equal_p (bitset dst, bitset src)
{
lbitset_elt *selt;
lbitset_elt *delt;
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. */
static inline void
-lbitset_copy (dst, src)
- bitset dst;
- bitset src;
+lbitset_copy (bitset dst, bitset src)
{
lbitset_elt *elt;
lbitset_elt *head;
}
-/* 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
-lbitset_copy_compare (dst, src)
- bitset dst;
- bitset src;
+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 int
-lbitset_size (src)
- bitset src;
+static bitset_bindex
+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 (dst, bitno)
- bitset dst;
- bitset_bindex bitno;
+lbitset_set (bitset dst, bitset_bindex bitno)
{
- bitset_windex index = bitno / BITSET_WORD_BITS;
+ bitset_windex windex = bitno / BITSET_WORD_BITS;
- lbitset_elt_find (dst, index, LBITSET_CREATE);
+ lbitset_elt_find (dst, windex, LBITSET_CREATE);
- dst->b.cdata[index - dst->b.cindex] |= (1 << (bitno % BITSET_WORD_BITS));
+ dst->b.cdata[windex - dst->b.cindex] |=
+ (bitset_word) 1 << (bitno % BITSET_WORD_BITS);
}
/* Reset bit BITNO in bitset DST. */
static void
-lbitset_reset (dst, bitno)
- bitset dst;
- bitset_bindex bitno;
+lbitset_reset (bitset dst, bitset_bindex bitno)
{
- bitset_windex index = bitno / BITSET_WORD_BITS;
+ bitset_windex windex = bitno / BITSET_WORD_BITS;
- if (!lbitset_elt_find (dst, index, LBITSET_FIND))
+ if (!lbitset_elt_find (dst, windex, LBITSET_FIND))
return;
- dst->b.cdata[index - dst->b.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 unlink it now... */
}
/* Test bit BITNO in bitset SRC. */
-static int
-lbitset_test (src, bitno)
- bitset src;
- bitset_bindex bitno;
+static bool
+lbitset_test (bitset src, bitset_bindex bitno)
{
- bitset_windex index = bitno / BITSET_WORD_BITS;
-
- if (!lbitset_elt_find (src, index, LBITSET_FIND))
- return 0;
+ bitset_windex windex = bitno / BITSET_WORD_BITS;
- return (src->b.
- cdata[index - 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 void
-lbitset_free (bset)
- bitset bset;
+lbitset_free (bitset bset)
{
lbitset_zero (bset);
}
/* 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
-lbitset_reverse_list (bset, list, num, next)
- bitset bset;
- bitset_bindex *list;
- bitset_bindex num;
- bitset_bindex *next;
+static bitset_bindex
+lbitset_list_reverse (bitset bset, bitset_bindex *list,
+ bitset_bindex num, bitset_bindex *next)
{
bitset_bindex rbitno;
bitset_bindex bitno;
- unsigned int bitcnt;
- bitset_bindex bitoff;
- bitset_windex index;
+ unsigned int bcount;
+ bitset_bindex boffset;
+ bitset_windex windex;
bitset_bindex count;
lbitset_elt *elt;
bitset_word word;
bitno = n_bits - (rbitno + 1);
- index = bitno / BITSET_WORD_BITS;
+ windex = bitno / BITSET_WORD_BITS;
/* Skip back to starting element. */
- for (; elt && elt->index > index; elt = elt->prev)
+ for (; elt && elt->index > windex; elt = elt->prev)
continue;
if (!elt)
return 0;
- /* If num is 1, we could speed things up with a binary search
- of the word of interest. */
+ if (windex >= elt->index + LBITSET_ELT_WORDS)
+ {
+ /* We are trying to start in no-mans land so start
+ at end of current elt. */
+ bcount = BITSET_WORD_BITS - 1;
+ windex = elt->index + LBITSET_ELT_WORDS - 1;
+ }
+ else
+ {
+ bcount = bitno % BITSET_WORD_BITS;
+ }
count = 0;
- bitcnt = bitno % BITSET_WORD_BITS;
- bitoff = index * BITSET_WORD_BITS;
+ boffset = windex * BITSET_WORD_BITS;
+
+ /* If num is 1, we could speed things up with a binary search
+ of the word of interest. */
while (elt)
{
bitset_word *srcp = elt->words;
- for (; (index - elt->index) < LBITSET_ELT_WORDS;
- index--, bitoff -= BITSET_WORD_BITS,
- bitcnt = BITSET_WORD_BITS - 1)
+ for (; (windex - elt->index) < LBITSET_ELT_WORDS;
+ windex--, boffset -= BITSET_WORD_BITS,
+ bcount = BITSET_WORD_BITS - 1)
{
word =
- srcp[index - elt->index] << (BITSET_WORD_BITS - 1 - bitcnt);
+ srcp[windex - elt->index] << (BITSET_WORD_BITS - 1 - bcount);
- for (; word; bitcnt--)
+ for (; word; bcount--)
{
if (word & BITSET_MSB)
{
- list[count++] = bitoff + bitcnt;
+ list[count++] = boffset + bcount;
if (count >= num)
{
- *next = n_bits - (bitoff + bitcnt);
+ *next = n_bits - (boffset + bcount);
return count;
}
}
elt = elt->prev;
if (elt)
{
- index = elt->index + LBITSET_ELT_WORDS - 1;
- bitoff = index * BITSET_WORD_BITS;
+ windex = elt->index + LBITSET_ELT_WORDS - 1;
+ boffset = windex * BITSET_WORD_BITS;
}
}
- *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
-lbitset_list (bset, list, num, next)
- bitset bset;
- bitset_bindex *list;
- bitset_bindex num;
- bitset_bindex *next;
+static bitset_bindex
+lbitset_list (bitset bset, bitset_bindex *list,
+ bitset_bindex num, bitset_bindex *next)
{
bitset_bindex bitno;
- bitset_windex index;
+ bitset_windex windex;
bitset_bindex count;
lbitset_elt *elt;
lbitset_elt *head;
/* Start with the first element. */
elt = head;
- index = elt->index;
- bitno = index * BITSET_WORD_BITS;
+ windex = elt->index;
+ bitno = windex * BITSET_WORD_BITS;
}
else
{
- index = bitno / BITSET_WORD_BITS;
+ windex = bitno / BITSET_WORD_BITS;
/* Skip to starting element. */
for (elt = head;
- elt && (elt->index + LBITSET_ELT_WORDS - 1) < index;
+ elt && (elt->index + LBITSET_ELT_WORDS - 1) < windex;
elt = elt->next)
continue;
if (!elt)
return 0;
- if (index < elt->index)
+ if (windex < elt->index)
{
- index = elt->index;
- bitno = index * BITSET_WORD_BITS;
+ windex = elt->index;
+ bitno = windex * BITSET_WORD_BITS;
}
else
{
/* We are starting within an element. */
- for (; (index - elt->index) < LBITSET_ELT_WORDS; index++)
+ for (; (windex - elt->index) < LBITSET_ELT_WORDS; windex++)
{
- word = srcp[index - elt->index] >> (bitno % BITSET_WORD_BITS);
+ word = srcp[windex - elt->index] >> (bitno % BITSET_WORD_BITS);
for (; word; bitno++)
{
}
word >>= 1;
}
- bitno = (index + 1) * BITSET_WORD_BITS;
+ bitno = (windex + 1) * BITSET_WORD_BITS;
}
elt = elt->next;
if (elt)
{
- index = elt->index;
- bitno = index * BITSET_WORD_BITS;
+ windex = elt->index;
+ bitno = windex * BITSET_WORD_BITS;
}
}
}
word >>= 1;
}
}
- index++;
- bitno = index * BITSET_WORD_BITS;
+ windex++;
+ bitno = windex * BITSET_WORD_BITS;
word = srcp[1];
if (word)
word >>= 1;
}
}
- index++;
- bitno = index * BITSET_WORD_BITS;
+ windex++;
+ bitno = windex * BITSET_WORD_BITS;
#else
for (i = 0; i < LBITSET_ELT_WORDS; i++)
{
word >>= 1;
}
}
- index++;
- bitno = index * BITSET_WORD_BITS;
+ windex++;
+ bitno = windex * BITSET_WORD_BITS;
}
#endif
}
}
word >>= 1;
}
- index++;
- bitno = index * BITSET_WORD_BITS;
+ windex++;
+ bitno = windex * BITSET_WORD_BITS;
}
}
elt = elt->next;
if (elt)
{
- index = elt->index;
- bitno = index * BITSET_WORD_BITS;
+ windex = elt->index;
+ bitno = windex * BITSET_WORD_BITS;
}
}
}
-static int
-lbitset_op1 (dst, op)
- bitset dst;
- enum bitset_ops op;
+static bool
+lbitset_empty_p (bitset dst)
{
- unsigned int i;
- bitset_windex index;
lbitset_elt *elt;
+ lbitset_elt *next;
- switch (op)
+ for (elt = LBITSET_HEAD (dst); elt; elt = next)
{
- case BITSET_OP_ZERO:
- lbitset_zero (dst);
- break;
+ next = elt->next;
+ if (!lbitset_elt_zero_p (elt))
+ return 0;
+ /* Weed as we go. */
+ lbitset_elt_unlink (dst, elt);
+ }
+
+ return 1;
+}
+
- case BITSET_OP_ONES:
- /* This is a decidedly unfriendly operation for a linked list
- bitset! */
+/* 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);
- /* Ignore empty set. */
- if (!elt)
- return 0;
+ 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;
+ }
+}
- index = elt->index;
- for (i = 0; i < index; i += LBITSET_ELT_WORDS)
- {
- /* Create new elements if they cannot be found. */
- elt = lbitset_elt_find (dst, i, LBITSET_CREATE);
- memset (elt->words, ~0, sizeof (elt->words));
- }
- break;
- case BITSET_OP_EMPTY_P:
- lbitset_weed (dst);
- if (LBITSET_HEAD (dst))
- return 0;
- break;
+static void
+lbitset_ones (bitset dst)
+{
+ bitset_windex i;
+ bitset_windex windex;
+ lbitset_elt *elt;
- default:
- abort ();
+ /* This is a decidedly unfriendly operation for a linked list
+ 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. */
+
+ 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));
}
- return 1;
+ lbitset_unused_clear (dst);
}
-static int
-lbitset_op2 (dst, src, op)
- bitset dst;
- bitset src;
- enum bitset_ops op;
+static void
+lbitset_not (bitset dst, bitset src)
{
lbitset_elt *elt;
lbitset_elt *selt;
lbitset_elt *delt;
- unsigned int i;
+ bitset_windex i;
unsigned int j;
- bitset_windex index;
+ bitset_windex windex;
- switch (op)
- {
- case BITSET_OP_COPY:
- lbitset_copy (dst, src);
- break;
+ /* This is another unfriendly operation for a linked list
+ bitset! */
+ elt = LBITSET_TAIL (dst);
- case BITSET_OP_NOT:
- /* This is another unfriendly operation for a linked list
- bitset! */
- elt = LBITSET_TAIL (dst);
- /* Ignore empty set. */
- if (!elt)
- return 0;
+ windex = (BITSET_SIZE_ (dst) + BITSET_WORD_BITS - 1) / BITSET_WORD_BITS;
- index = elt->index;
- for (i = 0; i < index; i += LBITSET_ELT_WORDS)
- {
- /* Create new elements for dst if they cannot be found
- or substitute zero elements if src elements not found. */
- selt = lbitset_elt_find (dst, i, LBITSET_SUBST);
- delt = lbitset_elt_find (dst, i, LBITSET_CREATE);
+ for (i = 0; i < windex; i += LBITSET_ELT_WORDS)
+ {
+ /* Create new elements for dst if they cannot be found
+ or substitute zero elements if src elements not found. */
+ selt = lbitset_elt_find (src, i, LBITSET_SUBST);
+ delt = lbitset_elt_find (dst, i, LBITSET_CREATE);
- for (j = 0; j < LBITSET_ELT_WORDS; j++)
- delt->words[j] = ~selt->words[j];
- }
- lbitset_weed (dst);
- break;
+ 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 == SRC. */
- case BITSET_OP_EQUAL_P:
- return lbitset_equal_p (dst, src);
- break;
- /* Return 1 if DST == DST | SRC. */
- case BITSET_OP_SUBSET_P:
- for (selt = LBITSET_HEAD (src), delt = LBITSET_HEAD (dst);
- selt || delt; selt = selt->next, delt = delt->next)
+/* Is DST == DST | SRC? */
+static bool
+lbitset_subset_p (bitset dst, bitset src)
+{
+ lbitset_elt *selt;
+ lbitset_elt *delt;
+ unsigned int j;
+
+ for (selt = LBITSET_HEAD (src), delt = LBITSET_HEAD (dst);
+ selt || delt; selt = selt->next, delt = delt->next)
+ {
+ if (!selt)
+ selt = &lbitset_zero_elts[0];
+ else if (!delt)
+ delt = &lbitset_zero_elts[0];
+ else if (selt->index != delt->index)
{
- if (!selt)
- selt = &lbitset_zero_elts[0];
- else if (!delt)
- delt = &lbitset_zero_elts[0];
- else if (selt->index != delt->index)
+ if (selt->index < delt->index)
{
- if (selt->index < delt->index)
- {
- lbitset_zero_elts[2].next = delt;
- delt = &lbitset_zero_elts[2];
- }
- else
- {
- lbitset_zero_elts[1].next = selt;
- selt = &lbitset_zero_elts[1];
- }
+ lbitset_zero_elts[2].next = delt;
+ delt = &lbitset_zero_elts[2];
+ }
+ else
+ {
+ lbitset_zero_elts[1].next = selt;
+ selt = &lbitset_zero_elts[1];
}
-
- for (j = 0; j < LBITSET_ELT_WORDS; j++)
- if (delt->words[j] != (selt->words[j] | delt->words[j]))
- return 0;
}
- break;
- /* Return 1 if DST & SRC == 0. */
- case BITSET_OP_DISJOINT_P:
- for (selt = LBITSET_HEAD (src), delt = LBITSET_HEAD (dst);
- selt && delt; selt = selt->next, delt = delt->next)
+ for (j = 0; j < LBITSET_ELT_WORDS; j++)
+ if (delt->words[j] != (selt->words[j] | delt->words[j]))
+ return false;
+ }
+ return true;
+}
+
+
+/* Is DST & SRC == 0? */
+static bool
+lbitset_disjoint_p (bitset dst, bitset src)
+{
+ lbitset_elt *selt;
+ lbitset_elt *delt;
+ unsigned int j;
+
+ for (selt = LBITSET_HEAD (src), delt = LBITSET_HEAD (dst);
+ selt && delt; selt = selt->next, delt = delt->next)
+ {
+ if (selt->index != delt->index)
{
- if (selt->index != delt->index)
+ if (selt->index < delt->index)
{
- if (selt->index < delt->index)
- {
- lbitset_zero_elts[2].next = delt;
- delt = &lbitset_zero_elts[2];
- }
- else
- {
- lbitset_zero_elts[1].next = selt;
- selt = &lbitset_zero_elts[1];
- }
+ lbitset_zero_elts[2].next = delt;
+ delt = &lbitset_zero_elts[2];
}
-
- for (j = 0; j < LBITSET_ELT_WORDS; j++)
- if (selt->words[j] & delt->words[j])
- return 0;
+ else
+ {
+ lbitset_zero_elts[1].next = selt;
+ selt = &lbitset_zero_elts[1];
+ }
+ /* Since the elements are different, there is no
+ intersection of these elements. */
+ continue;
}
- break;
- default:
- abort ();
+ for (j = 0; j < LBITSET_ELT_WORDS; j++)
+ if (selt->words[j] & delt->words[j])
+ return false;
}
-
- return 1;
+ return true;
}
-static int
-lbitset_op3 (dst, src1, src2, op)
- bitset dst;
- bitset src1;
- bitset src2;
- enum bitset_ops op;
+static bool
+lbitset_op3_cmp (bitset dst, bitset src1, bitset src2, enum bitset_ops op)
{
lbitset_elt *selt1 = LBITSET_HEAD (src1);
lbitset_elt *selt2 = LBITSET_HEAD (src2);
lbitset_elt *delt = LBITSET_HEAD (dst);
- bitset_windex index1;
- bitset_windex index2;
- bitset_windex index;
+ bitset_windex windex1;
+ bitset_windex windex2;
+ bitset_windex windex;
lbitset_elt *stmp1;
lbitset_elt *stmp2;
lbitset_elt *dtmp;
bitset_word *srcp1;
bitset_word *srcp2;
bitset_word *dstp;
- int changed = 0;
+ bool changed = false;
unsigned int i;
- /* Fast track common, simple cases. */
- if (!selt2)
- {
- if (op == BITSET_OP_AND)
- {
- lbitset_weed (dst);
- changed = !LBITSET_HEAD (dst);
- lbitset_zero (dst);
- return changed;
- }
- else if (op == BITSET_OP_ANDN || op == BITSET_OP_OR
- || op == BITSET_OP_XOR)
- {
- return lbitset_copy_compare (dst, src1);
- }
- }
- else if (!selt1)
- {
- if (op == BITSET_OP_AND || op == BITSET_OP_ANDN)
- {
- lbitset_weed (dst);
- changed = !LBITSET_HEAD (dst);
- lbitset_zero (dst);
- return changed;
- }
- else if (op == BITSET_OP_OR || op == BITSET_OP_XOR)
- {
- return lbitset_copy_compare (dst, src2);
- }
- }
-
LBITSET_HEAD (dst) = 0;
dst->b.csize = 0;
- index1 = (selt1) ? selt1->index : BITSET_INDEX_MAX;
- index2 = (selt2) ? selt2->index : BITSET_INDEX_MAX;
+ windex1 = (selt1) ? selt1->index : BITSET_WINDEX_MAX;
+ windex2 = (selt2) ? selt2->index : BITSET_WINDEX_MAX;
while (selt1 || selt2)
{
/* Figure out whether we need to substitute zero elements for
missing links. */
- if (index1 == index2)
+ if (windex1 == windex2)
{
- index = index1;
+ windex = windex1;
stmp1 = selt1;
stmp2 = selt2;
selt1 = selt1->next;
- index1 = (selt1) ? selt1->index : BITSET_INDEX_MAX;
+ windex1 = (selt1) ? selt1->index : BITSET_WINDEX_MAX;
selt2 = selt2->next;
- index2 = (selt2) ? selt2->index : BITSET_INDEX_MAX;
+ windex2 = (selt2) ? selt2->index : BITSET_WINDEX_MAX;
}
- else if (index1 < index2)
+ else if (windex1 < windex2)
{
- index = index1;
+ windex = windex1;
stmp1 = selt1;
stmp2 = &lbitset_zero_elts[0];
selt1 = selt1->next;
- index1 = (selt1) ? selt1->index : BITSET_INDEX_MAX;
+ windex1 = (selt1) ? selt1->index : BITSET_WINDEX_MAX;
}
else
{
- index = index2;
+ windex = windex2;
stmp1 = &lbitset_zero_elts[0];
stmp2 = selt2;
selt2 = selt2->next;
- index2 = (selt2) ? selt2->index : BITSET_INDEX_MAX;
+ windex2 = (selt2) ? selt2->index : BITSET_WINDEX_MAX;
}
/* Find the appropriate element from DST. Begin by discarding
elements that we've skipped. */
- while (delt && delt->index < index)
+ while (delt && delt->index < windex)
{
- changed = 1;
+ changed = true;
dtmp = delt;
delt = delt->next;
lbitset_elt_free (dtmp);
}
- if (delt && delt->index == index)
+ if (delt && delt->index == windex)
{
dtmp = delt;
delt = delt->next;
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;
- *dstp = tmp;
- }
- }
- break;
-
- case BITSET_OP_ORN:
- for (i = 0; i < LBITSET_ELT_WORDS; i++, dstp++)
- {
- bitset_word tmp = *srcp1++ | ~(*srcp2++);
-
- if (*dstp != tmp)
- {
- changed = 1;
+ changed = true;
*dstp = tmp;
}
}
if (!lbitset_elt_zero_p (dtmp))
{
- dtmp->index = index;
+ dtmp->index = windex;
/* Perhaps this could be optimised... */
lbitset_elt_link (dst, dtmp);
}
/* If we have elements of DST left over, free them all. */
if (delt)
{
- changed = 1;
+ changed = true;
lbitset_prune (dst, delt);
}
}
+static bool
+lbitset_and_cmp (bitset dst, bitset src1, bitset src2)
+{
+ lbitset_elt *selt1 = LBITSET_HEAD (src1);
+ lbitset_elt *selt2 = LBITSET_HEAD (src2);
+ bool changed;
+
+ if (!selt2)
+ {
+ lbitset_weed (dst);
+ changed = !LBITSET_HEAD (dst);
+ lbitset_zero (dst);
+ return changed;
+ }
+ else if (!selt1)
+ {
+ lbitset_weed (dst);
+ changed = !LBITSET_HEAD (dst);
+ lbitset_zero (dst);
+ return changed;
+ }
+ return lbitset_op3_cmp (dst, src1, src2, BITSET_OP_AND);
+}
+
+
+static void
+lbitset_and (bitset dst, bitset src1, bitset src2)
+{
+ lbitset_and_cmp (dst, src1, src2);
+}
+
+
+static bool
+lbitset_andn_cmp (bitset dst, bitset src1, bitset src2)
+{
+ lbitset_elt *selt1 = LBITSET_HEAD (src1);
+ lbitset_elt *selt2 = LBITSET_HEAD (src2);
+ bool changed;
+
+ if (!selt2)
+ {
+ return lbitset_copy_cmp (dst, src1);
+ }
+ else if (!selt1)
+ {
+ lbitset_weed (dst);
+ changed = !LBITSET_HEAD (dst);
+ lbitset_zero (dst);
+ return changed;
+ }
+ return lbitset_op3_cmp (dst, src1, src2, BITSET_OP_ANDN);
+}
+
+
+static void
+lbitset_andn (bitset dst, bitset src1, bitset src2)
+{
+ lbitset_andn_cmp (dst, src1, src2);
+}
+
+
+static bool
+lbitset_or_cmp (bitset dst, bitset src1, bitset src2)
+{
+ lbitset_elt *selt1 = LBITSET_HEAD (src1);
+ lbitset_elt *selt2 = LBITSET_HEAD (src2);
+
+ if (!selt2)
+ {
+ return lbitset_copy_cmp (dst, src1);
+ }
+ else if (!selt1)
+ {
+ return lbitset_copy_cmp (dst, src2);
+ }
+ return lbitset_op3_cmp (dst, src1, src2, BITSET_OP_OR);
+}
+
+
+static void
+lbitset_or (bitset dst, bitset src1, bitset src2)
+{
+ lbitset_or_cmp (dst, src1, src2);
+}
+
+
+static bool
+lbitset_xor_cmp (bitset dst, bitset src1, bitset src2)
+{
+ lbitset_elt *selt1 = LBITSET_HEAD (src1);
+ lbitset_elt *selt2 = LBITSET_HEAD (src2);
+
+ if (!selt2)
+ {
+ return lbitset_copy_cmp (dst, src1);
+ }
+ else if (!selt1)
+ {
+ return lbitset_copy_cmp (dst, src2);
+ }
+ return lbitset_op3_cmp (dst, src1, src2, BITSET_OP_XOR);
+}
+
+
+static void
+lbitset_xor (bitset dst, bitset src1, bitset src2)
+{
+ lbitset_xor_cmp (dst, src1, src2);
+}
+
+
+
/* Vector of operations for linked-list bitsets. */
-struct bitset_ops_struct lbitset_ops = {
+struct bitset_vtable lbitset_vtable = {
lbitset_set,
lbitset_reset,
+ bitset_toggle_,
lbitset_test,
- lbitset_size,
- lbitset_op1,
- lbitset_op2,
- lbitset_op3,
- bitset_op4,
+ lbitset_resize,
+ bitset_size_,
+ bitset_count_,
+ lbitset_empty_p,
+ lbitset_ones,
+ lbitset_zero,
+ lbitset_copy,
+ lbitset_disjoint_p,
+ lbitset_equal_p,
+ lbitset_not,
+ lbitset_subset_p,
+ lbitset_and,
+ lbitset_and_cmp,
+ lbitset_andn,
+ lbitset_andn_cmp,
+ lbitset_or,
+ lbitset_or_cmp,
+ lbitset_xor,
+ lbitset_xor_cmp,
+ bitset_and_or_,
+ bitset_and_or_cmp_,
+ bitset_andn_or_,
+ bitset_andn_or_cmp_,
+ bitset_or_and_,
+ bitset_or_and_cmp_,
lbitset_list,
- lbitset_reverse_list,
+ lbitset_list_reverse,
lbitset_free,
BITSET_LIST
};
/* Return size of initial structure. */
-int
-lbitset_bytes (n_bits)
- bitset_bindex n_bits ATTRIBUTE_UNUSED;
+size_t
+lbitset_bytes (bitset_bindex n_bits ATTRIBUTE_UNUSED)
{
- return sizeof (struct bitset_struct);
+ return sizeof (struct lbitset_struct);
}
/* Initialize a bitset. */
-
bitset
-lbitset_init (bset, n_bits)
- bitset bset;
- bitset_bindex n_bits ATTRIBUTE_UNUSED;
+lbitset_init (bitset bset, bitset_bindex n_bits ATTRIBUTE_UNUSED)
{
- bset->b.ops = &lbitset_ops;
+ BITSET_NBITS_ (bset) = n_bits;
+ bset->b.vtable = &lbitset_vtable;
return bset;
}
void
-lbitset_release_memory ()
+lbitset_release_memory (void)
{
lbitset_free_list = 0;
if (lbitset_obstack_init)
{
- lbitset_obstack_init = 0;
+ lbitset_obstack_init = false;
obstack_free (&lbitset_obstack, NULL);
}
}
+
+
+/* Function to be called from debugger to debug lbitset. */
+void
+debug_lbitset (bitset bset)
+{
+ lbitset_elt *elt;
+ unsigned int i;
+
+ if (!bset)
+ return;
+
+ for (elt = LBITSET_HEAD (bset); elt; elt = elt->next)
+ {
+ fprintf (stderr, "Elt %lu\n", (unsigned long int) elt->index);
+ for (i = 0; i < LBITSET_ELT_WORDS; i++)
+ {
+ unsigned int j;
+ bitset_word word;
+
+ word = elt->words[i];
+
+ fprintf (stderr, " Word %u:", i);
+ for (j = 0; j < LBITSET_WORD_BITS; j++)
+ if ((word & ((bitset_word) 1 << j)))
+ fprintf (stderr, " %u", j);
+ fprintf (stderr, "\n");
+ }
+ }
+}
projects / bison.git / blobdiff