1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
|
/* Base bitset stuff.
Copyright (C) 2002-2004, 2006, 2009-2015, 2018 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 3 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.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef _BBITSET_H
#define _BBITSET_H
#include <limits.h>
#include <stdbool.h>
#include <stddef.h>
#include "xalloc.h"
#ifndef __attribute__
# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8)
# define __attribute__(x)
# endif
#endif
#define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
/* Currently we support five flavours of bitsets:
BITSET_ARRAY: Array of bits (fixed size, fast for dense bitsets).
Memory for bit array and bitset structure allocated
contiguously.
BITSET_LIST: Linked list of arrays of bits (variable size, least storage
for large very sparse sets).
BITSET_TABLE: Expandable table of pointers to arrays of bits
(variable size, less storage for large sparse sets).
Faster than BITSET_LIST for random access.
BITSET_VARRAY: Variable array of bits (variable size, fast for
dense bitsets).
BITSET_STATS: Wrapper bitset for internal use only. Used for gathering
statistics and/or better run-time checking.
*/
enum bitset_type {BITSET_ARRAY, BITSET_LIST, BITSET_TABLE, BITSET_VARRAY,
BITSET_TYPE_NUM, BITSET_STATS};
#define BITSET_TYPE_NAMES {"abitset", "lbitset", "ebitset", "vbitset"}
extern const char * const bitset_type_names[];
enum bitset_alloc_type {BITSET_MALLOC, BITSET_OBALLOC};
/* Data type used to store a word of bits. */
typedef unsigned long bitset_word;
#define BITSET_WORD_BITS ((unsigned) (CHAR_BIT * sizeof (bitset_word)))
/* Bit index. In theory we might need a type wider than size_t, but
in practice we lose at most a factor of CHAR_BIT by going with
size_t, and that is good enough. If this type is changed to be
wider than size_t, the code needs to be modified to check for
overflow when converting bit counts to byte or word counts.
The bit and word index types must be unsigned. */
typedef size_t bitset_bindex;
/* Word index. */
typedef size_t bitset_windex;
/* Maximum values for commonly-used unsigned types. BITSET_SIZE_MAX
always equals SIZE_MAX, but some older systems lack SIZE_MAX. */
#define BITSET_BINDEX_MAX ((bitset_bindex) -1)
/* Limit max word index to the maximum value of a signed integer
to simplify cache disabling. */
#define BITSET_WINDEX_MAX (((bitset_windex) -1) >> 1)
#define BITSET_SIZE_MAX ((size_t) -1)
#define BITSET_MSB ((bitset_word) 1 << (BITSET_WORD_BITS - 1))
#define BITSET_LIST_SIZE 1024
enum bitset_ops {BITSET_OP_ZERO, BITSET_OP_ONES,
BITSET_OP_COPY, BITSET_OP_NOT,
BITSET_OP_EMPTY_P, BITSET_OP_EQUAL_P,
BITSET_OP_SUBSET_P, BITSET_OP_DISJOINT_P,
BITSET_OP_AND, BITSET_OP_OR, BITSET_OP_XOR, BITSET_OP_ANDN,
BITSET_OP_OR_AND, BITSET_OP_AND_OR, BITSET_OP_ANDN_OR};
struct bbitset_struct
{
const struct bitset_vtable *vtable;
bitset_windex cindex; /* Cache word index. */
bitset_windex csize; /* Cache size in words. */
bitset_word *cdata; /* Cache data pointer. */
bitset_bindex n_bits; /* Number of bits. */
/* Perhaps we could sacrifice another word to indicate
that the bitset is known to be zero, that a bit has been set
in the cache, and that a bit has been cleared in the cache.
This would speed up some of the searches but slightly slow down
bit set/reset operations of cached bits. */
};
typedef union bitset_union *bitset;
/* Private accessor macros to bitset structure. */
#define BITSET_VTABLE_(SRC) (SRC)->b.vtable
#define BITSET_CINDEX_(SRC) (SRC)->b.cindex
#define BITSET_CDATA_(SRC) (SRC)->b.cdata
#define BITSET_CSIZE_(SRC) (SRC)->b.csize
#define BITSET_NBITS_(SRC) (SRC)->b.n_bits
/* The contents of this structure should be considered private. */
struct bitset_vtable
{
void (*set) (bitset, bitset_bindex);
void (*reset) (bitset, bitset_bindex);
bool (*toggle) (bitset, bitset_bindex);
bool (*test) (bitset, bitset_bindex);
bitset_bindex (*resize) (bitset, bitset_bindex);
bitset_bindex (*size) (bitset);
bitset_bindex (*count) (bitset);
bool (*empty_p) (bitset);
void (*ones) (bitset);
void (*zero) (bitset);
void (*copy) (bitset, bitset);
bool (*disjoint_p) (bitset, bitset);
bool (*equal_p) (bitset, bitset);
void (*not_) (bitset, bitset);
bool (*subset_p) (bitset, bitset);
void (*and_) (bitset, bitset, bitset);
bool (*and_cmp) (bitset, bitset, bitset);
void (*andn) (bitset, bitset, bitset);
bool (*andn_cmp) (bitset, bitset, bitset);
void (*or_) (bitset, bitset, bitset);
bool (*or_cmp) (bitset, bitset, bitset);
void (*xor_) (bitset, bitset, bitset);
bool (*xor_cmp) (bitset, bitset, bitset);
void (*and_or) (bitset, bitset, bitset, bitset);
bool (*and_or_cmp) (bitset, bitset, bitset, bitset);
void (*andn_or) (bitset, bitset, bitset, bitset);
bool (*andn_or_cmp) (bitset, bitset, bitset, bitset);
void (*or_and) (bitset, bitset, bitset, bitset);
bool (*or_and_cmp) (bitset, bitset, bitset, bitset);
bitset_bindex (*list) (bitset, bitset_bindex *, bitset_bindex,
bitset_bindex *);
bitset_bindex (*list_reverse) (bitset, bitset_bindex *, bitset_bindex,
bitset_bindex *);
void (*free) (bitset);
enum bitset_type type;
};
#define BITSET_COMPATIBLE_(BSET1, BSET2) \
((BSET1)->b.vtable == (BSET2)->b.vtable)
#define BITSET_CHECK2_(DST, SRC) \
if (!BITSET_COMPATIBLE_ (DST, SRC)) abort ();
#define BITSET_CHECK3_(DST, SRC1, SRC2) \
if (!BITSET_COMPATIBLE_ (DST, SRC1) \
|| !BITSET_COMPATIBLE_ (DST, SRC2)) abort ();
#define BITSET_CHECK4_(DST, SRC1, SRC2, SRC3) \
if (!BITSET_COMPATIBLE_ (DST, SRC1) || !BITSET_COMPATIBLE_ (DST, SRC2) \
|| !BITSET_COMPATIBLE_ (DST, SRC3)) abort ();
/* Redefine number of bits in bitset DST. */
#define BITSET_RESIZE_(DST, SIZE) (DST)->b.vtable->resize (DST, SIZE)
/* Return size in bits of bitset SRC. */
#define BITSET_SIZE_(SRC) (SRC)->b.vtable->size (SRC)
/* Return number of bits set in bitset SRC. */
#define BITSET_COUNT_(SRC) (SRC)->b.vtable->count (SRC)
/* Return type of bitset SRC. */
#define BITSET_TYPE_(DST) (DST)->b.vtable->type
/* Set bit BITNO in bitset DST. */
#define BITSET_SET_(DST, BITNO) (DST)->b.vtable->set (DST, BITNO)
/* Reset bit BITNO in bitset DST. */
#define BITSET_RESET_(DST, BITNO) (DST)->b.vtable->reset (DST, BITNO)
/* Toggle bit BITNO in bitset DST. */
#define BITSET_TOGGLE_(DST, BITNO) (DST)->b.vtable->toggle (DST, BITNO)
/* Return non-zero if bit BITNO in bitset SRC is set. */
#define BITSET_TEST_(SRC, BITNO) (SRC)->b.vtable->test (SRC, BITNO)
/* Free bitset SRC. */
#define BITSET_FREE_(SRC)\
((SRC)->b.vtable->free ? (SRC)->b.vtable->free (SRC) :(void)0)
/* Return SRC == 0. */
#define BITSET_EMPTY_P_(SRC) (SRC)->b.vtable->empty_p (SRC)
/* DST = ~0. */
#define BITSET_ONES_(DST) (DST)->b.vtable->ones (DST)
/* DST = 0. */
#define BITSET_ZERO_(DST) (DST)->b.vtable->zero (DST)
/* DST = SRC. */
#define BITSET_COPY_(DST, SRC) (SRC)->b.vtable->copy (DST, SRC)
/* Return DST & SRC == 0. */
#define BITSET_DISJOINT_P_(DST, SRC) (SRC)->b.vtable->disjoint_p (DST, SRC)
/* Return DST == SRC. */
#define BITSET_EQUAL_P_(DST, SRC) (SRC)->b.vtable->equal_p (DST, SRC)
/* DST = ~SRC. */
#define BITSET_NOT_(DST, SRC) (SRC)->b.vtable->not_ (DST, SRC)
/* Return DST == DST | SRC. */
#define BITSET_SUBSET_P_(DST, SRC) (SRC)->b.vtable->subset_p (DST, SRC)
/* DST = SRC1 & SRC2. */
#define BITSET_AND_(DST, SRC1, SRC2) (SRC1)->b.vtable->and_ (DST, SRC1, SRC2)
#define BITSET_AND_CMP_(DST, SRC1, SRC2) (SRC1)->b.vtable->and_cmp (DST, SRC1, SRC2)
/* DST = SRC1 & ~SRC2. */
#define BITSET_ANDN_(DST, SRC1, SRC2) (SRC1)->b.vtable->andn (DST, SRC1, SRC2)
#define BITSET_ANDN_CMP_(DST, SRC1, SRC2) (SRC1)->b.vtable->andn_cmp (DST, SRC1, SRC2)
/* DST = SRC1 | SRC2. */
#define BITSET_OR_(DST, SRC1, SRC2) (SRC1)->b.vtable->or_ (DST, SRC1, SRC2)
#define BITSET_OR_CMP_(DST, SRC1, SRC2) (SRC1)->b.vtable->or_cmp (DST, SRC1, SRC2)
/* DST = SRC1 ^ SRC2. */
#define BITSET_XOR_(DST, SRC1, SRC2) (SRC1)->b.vtable->xor_ (DST, SRC1, SRC2)
#define BITSET_XOR_CMP_(DST, SRC1, SRC2) (SRC1)->b.vtable->xor_cmp (DST, SRC1, SRC2)
/* DST = (SRC1 & SRC2) | SRC3. Return non-zero if
DST != (SRC1 & SRC2) | SRC3. */
#define BITSET_AND_OR_(DST, SRC1, SRC2, SRC3) \
(SRC1)->b.vtable->and_or (DST, SRC1, SRC2, SRC3)
#define BITSET_AND_OR_CMP_(DST, SRC1, SRC2, SRC3) \
(SRC1)->b.vtable->and_or_cmp (DST, SRC1, SRC2, SRC3)
/* DST = (SRC1 & ~SRC2) | SRC3. Return non-zero if
DST != (SRC1 & ~SRC2) | SRC3. */
#define BITSET_ANDN_OR_(DST, SRC1, SRC2, SRC3) \
(SRC1)->b.vtable->andn_or (DST, SRC1, SRC2, SRC3)
#define BITSET_ANDN_OR_CMP_(DST, SRC1, SRC2, SRC3) \
(SRC1)->b.vtable->andn_or_cmp (DST, SRC1, SRC2, SRC3)
/* DST = (SRC1 | SRC2) & SRC3. Return non-zero if
DST != (SRC1 | SRC2) & SRC3. */
#define BITSET_OR_AND_(DST, SRC1, SRC2, SRC3) \
(SRC1)->b.vtable->or_and (DST, SRC1, SRC2, SRC3)
#define BITSET_OR_AND_CMP_(DST, SRC1, SRC2, SRC3) \
(SRC1)->b.vtable->or_and_cmp (DST, SRC1, SRC2, SRC3)
/* Find list of up to NUM bits set in BSET starting from and including
*NEXT. Return with actual number of bits found and with *NEXT
indicating where search stopped. */
#define BITSET_LIST_(BSET, LIST, NUM, NEXT) \
(BSET)->b.vtable->list (BSET, LIST, NUM, NEXT)
/* Find reverse list of up to NUM bits set in BSET starting from and
including NEXT. Return with actual number of bits found and with
*NEXT indicating where search stopped. */
#define BITSET_LIST_REVERSE_(BSET, LIST, NUM, NEXT) \
(BSET)->b.vtable->list_reverse (BSET, LIST, NUM, NEXT)
/* Private functions for bitset implementations. */
bool bitset_toggle_ (bitset, bitset_bindex);
bitset_bindex bitset_count_ (bitset);
bitset_bindex bitset_size_ (bitset);
bool bitset_copy_ (bitset, bitset);
void bitset_and_or_ (bitset, bitset, bitset, bitset);
bool bitset_and_or_cmp_ (bitset, bitset, bitset, bitset);
void bitset_andn_or_ (bitset, bitset, bitset, bitset);
bool bitset_andn_or_cmp_ (bitset, bitset, bitset, bitset);
void bitset_or_and_ (bitset, bitset, bitset, bitset);
bool bitset_or_and_cmp_ (bitset, bitset, bitset, bitset);
#endif /* _BBITSET_H */
|
