#include "lbitset.h"
#include "obstack.h"
#include <stdlib.h>
+#include <stdio.h>
/* This file implements linked-list bitsets. These bitsets can be of
arbitrary length and are more efficient than arrays of bits for
};
+typedef void(*PFV)();
+
+
enum lbitset_find_mode
{ LBITSET_FIND, LBITSET_CREATE, LBITSET_SUBST };
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 int lbitset_copy_cmp 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
+static bitset_bindex lbitset_size PARAMS ((bitset));
+static int lbitset_op3_cmp PARAMS ((bitset, bitset, bitset, enum bitset_ops));
+static bitset_bindex lbitset_list PARAMS ((bitset, bitset_bindex *,
+ bitset_bindex, bitset_bindex *));
+static bitset_bindex lbitset_list_reverse
PARAMS ((bitset, bitset_bindex *, bitset_bindex, bitset_bindex *));
static void lbitset_free PARAMS ((bitset));
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 && (windex - elt->index) < LBITSET_ELT_WORDS)
{
return 0;
case LBITSET_CREATE:
- windex = (windex / (unsigned) LBITSET_ELT_WORDS) * LBITSET_ELT_WORDS;
+ windex -= windex % LBITSET_ELT_WORDS;
elt = lbitset_elt_calloc ();
elt->index = windex;
/* Set all bits in the bitset to zero. */
-static inline void
+static void
lbitset_zero (bset)
bitset bset;
{
}
+/* Return 1 if DST == SRC. */
static inline int
lbitset_equal_p (dst, src)
bitset dst;
/* Copy bits from bitset SRC to bitset DST. Return non-zero if
bitsets different. */
static inline int
-lbitset_copy_compare (dst, src)
+lbitset_copy_cmp (dst, src)
bitset dst;
bitset src;
{
/* Return size in bits of bitset SRC. */
-static int
+static bitset_bindex
lbitset_size (src)
bitset src;
{
lbitset_elt_find (dst, windex, LBITSET_CREATE);
- dst->b.cdata[windex - dst->b.cindex] |= (1 << (bitno % BITSET_WORD_BITS));
+ dst->b.cdata[windex - dst->b.cindex] |=
+ (bitset_word) 1 << (bitno % BITSET_WORD_BITS);
}
if (!lbitset_elt_find (dst, windex, LBITSET_FIND))
return;
- dst->b.cdata[windex - 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... */
}
/* 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)
+static bitset_bindex
+lbitset_list_reverse (bset, list, num, next)
bitset bset;
bitset_bindex *list;
bitset_bindex num;
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;
- bcount = bitno % 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;
/* 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
+static bitset_bindex
lbitset_list (bset, list, num, next)
bitset bset;
bitset_bindex *list;
static int
-lbitset_op1 (dst, op)
+lbitset_empty_p (dst)
bitset dst;
- enum bitset_ops op;
{
- unsigned int i;
+ lbitset_weed (dst);
+ if (LBITSET_HEAD (dst))
+ return 0;
+ return 1;
+}
+
+
+static void
+lbitset_ones (dst)
+ bitset dst;
+{
+ bitset_windex i;
bitset_windex windex;
lbitset_elt *elt;
- switch (op)
+ /* 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. */
+ elt = LBITSET_TAIL (dst);
+ /* Ignore empty set. */
+ if (!elt)
+ return;
+
+ windex = elt->index;
+ for (i = 0; i < windex; i += LBITSET_ELT_WORDS)
{
- case BITSET_OP_ZERO:
- lbitset_zero (dst);
- break;
-
- case BITSET_OP_ONES:
- /* This is a decidedly unfriendly operation for a linked list
- bitset! */
- elt = LBITSET_TAIL (dst);
- /* Ignore empty set. */
- if (!elt)
- return 0;
-
- windex = elt->index;
- 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, ~0, sizeof (elt->words));
- }
- break;
-
- case BITSET_OP_EMPTY_P:
- lbitset_weed (dst);
- if (LBITSET_HEAD (dst))
- return 0;
- break;
-
- default:
- abort ();
+ /* 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;
}
-static int
-lbitset_op2 (dst, src, op)
+static void
+lbitset_not (dst, src)
bitset dst;
bitset src;
- enum bitset_ops op;
{
lbitset_elt *elt;
lbitset_elt *selt;
lbitset_elt *delt;
- unsigned int i;
+ bitset_windex i;
unsigned int j;
bitset_windex windex;
- switch (op)
+ /* This is another unfriendly operation for a linked list
+ bitset! */
+ elt = LBITSET_TAIL (dst);
+ /* Ignore empty set. */
+ if (!elt)
+ return;
+
+ windex = elt->index;
+ for (i = 0; i < windex; i += LBITSET_ELT_WORDS)
{
- case BITSET_OP_COPY:
- lbitset_copy (dst, src);
- break;
-
- 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 = elt->index;
- 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 (dst, i, LBITSET_SUBST);
- delt = lbitset_elt_find (dst, i, LBITSET_CREATE);
+ /* 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);
+ return;
+}
- for (j = 0; j < LBITSET_ELT_WORDS; j++)
- delt->words[j] = ~selt->words[j];
- }
- lbitset_weed (dst);
- break;
- /* Return 1 if DST == SRC. */
- case BITSET_OP_EQUAL_P:
- return lbitset_equal_p (dst, src);
- break;
+/* Return 1 if DST == DST | SRC. */
+static int
+lbitset_subset_p (dst, src)
+ bitset dst;
+ bitset src;
+{
+ lbitset_elt *selt;
+ lbitset_elt *delt;
+ unsigned int j;
- /* 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)
+ 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;
+
+ for (j = 0; j < LBITSET_ELT_WORDS; j++)
+ if (delt->words[j] != (selt->words[j] | delt->words[j]))
+ return 0;
+ }
+ return 1;
+}
+
+
+/* Return 1 if DST & SRC == 0. */
+static int
+lbitset_disjoint_p (dst, src)
+ bitset dst;
+ bitset src;
+{
+ lbitset_elt *selt;
+ lbitset_elt *delt;
+ unsigned int j;
- /* 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 (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];
- }
- /* Since the elements are different, there is no
- intersection of these elements. */
- continue;
+ 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 0;
}
-
return 1;
}
static int
-lbitset_op3 (dst, src1, src2, op)
+lbitset_op3_cmp (dst, src1, src2, op)
bitset dst;
bitset src1;
bitset src2;
int changed = 0;
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;
- windex1 = (selt1) ? selt1->index : BITSET_INDEX_MAX;
- windex2 = (selt2) ? selt2->index : BITSET_INDEX_MAX;
+ windex1 = (selt1) ? selt1->index : BITSET_WINDEX_MAX;
+ windex2 = (selt2) ? selt2->index : BITSET_WINDEX_MAX;
while (selt1 || selt2)
{
stmp1 = selt1;
stmp2 = selt2;
selt1 = selt1->next;
- windex1 = (selt1) ? selt1->index : BITSET_INDEX_MAX;
+ windex1 = (selt1) ? selt1->index : BITSET_WINDEX_MAX;
selt2 = selt2->next;
- windex2 = (selt2) ? selt2->index : BITSET_INDEX_MAX;
+ windex2 = (selt2) ? selt2->index : BITSET_WINDEX_MAX;
}
else if (windex1 < windex2)
{
stmp1 = selt1;
stmp2 = &lbitset_zero_elts[0];
selt1 = selt1->next;
- windex1 = (selt1) ? selt1->index : BITSET_INDEX_MAX;
+ windex1 = (selt1) ? selt1->index : BITSET_WINDEX_MAX;
}
else
{
stmp1 = &lbitset_zero_elts[0];
stmp2 = selt2;
selt2 = selt2->next;
- windex2 = (selt2) ? selt2->index : BITSET_INDEX_MAX;
+ windex2 = (selt2) ? selt2->index : BITSET_WINDEX_MAX;
}
/* Find the appropriate element from DST. Begin by discarding
}
+static int
+lbitset_and_cmp (dst, src1, src2)
+ bitset dst;
+ bitset src1;
+ bitset src2;
+{
+ lbitset_elt *selt1 = LBITSET_HEAD (src1);
+ lbitset_elt *selt2 = LBITSET_HEAD (src2);
+ int 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 int
+lbitset_andn_cmp (dst, src1, src2)
+ bitset dst;
+ bitset src1;
+ bitset src2;
+{
+ lbitset_elt *selt1 = LBITSET_HEAD (src1);
+ lbitset_elt *selt2 = LBITSET_HEAD (src2);
+ int 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 int
+lbitset_or_cmp (dst, src1, src2)
+ 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 int
+lbitset_xor_cmp (dst, src1, src2)
+ 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);
+}
+
+
+
/* 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,
+ bitset_count_,
+ lbitset_empty_p,
+ lbitset_ones,
+ lbitset_zero,
+ lbitset_copy,
+ lbitset_disjoint_p,
+ lbitset_equal_p,
+ lbitset_not,
+ lbitset_subset_p,
+ (PFV) lbitset_and_cmp,
+ lbitset_and_cmp,
+ (PFV) lbitset_andn_cmp,
+ lbitset_andn_cmp,
+ (PFV) lbitset_or_cmp,
+ lbitset_or_cmp,
+ (PFV) lbitset_xor_cmp,
+ lbitset_xor_cmp,
+ (PFV) bitset_and_or_cmp_,
+ bitset_and_or_cmp_,
+ (PFV) bitset_andn_or_cmp_,
+ bitset_andn_or_cmp_,
+ (PFV) bitset_or_and_cmp_,
+ bitset_or_and_cmp_,
lbitset_list,
- lbitset_reverse_list,
+ lbitset_list_reverse,
lbitset_free,
BITSET_LIST
};
/* Return size of initial structure. */
-int
+size_t
lbitset_bytes (n_bits)
bitset_bindex n_bits ATTRIBUTE_UNUSED;
{
/* Initialize a bitset. */
-
bitset
lbitset_init (bset, n_bits)
bitset bset;
bitset_bindex n_bits ATTRIBUTE_UNUSED;
{
- bset->b.ops = &lbitset_ops;
+ bset->b.vtable = &lbitset_vtable;
return bset;
}
obstack_free (&lbitset_obstack, NULL);
}
}
+
+
+/* Function to be called from debugger to debug lbitset. */
+void
+debug_lbitset (bset)
+ 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) 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