xref: /freebsd/sys/sys/bitset.h (revision e17f5b1d)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2008, Jeffrey Roberson <jeff@freebsd.org>
5  * All rights reserved.
6  *
7  * Copyright (c) 2008 Nokia Corporation
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice unmodified, this list of conditions, and the following
15  *    disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30  *
31  * $FreeBSD$
32  */
33 
34 #ifndef _SYS_BITSET_H_
35 #define	_SYS_BITSET_H_
36 
37 /*
38  * Whether expr is both constant and true.  Result is itself constant.
39  * Used to enable optimizations for sets with a known small size.
40  */
41 #define	__constexpr_cond(expr)	(__builtin_constant_p((expr)) && (expr))
42 
43 #define	__bitset_mask(_s, n)						\
44 	(1UL << (__constexpr_cond(__bitset_words((_s)) == 1) ?		\
45 	    (__size_t)(n) : ((n) % _BITSET_BITS)))
46 
47 #define	__bitset_word(_s, n)						\
48 	(__constexpr_cond(__bitset_words((_s)) == 1) ?			\
49 	 0 : ((n) / _BITSET_BITS))
50 
51 #define	BIT_CLR(_s, n, p)						\
52 	((p)->__bits[__bitset_word(_s, n)] &= ~__bitset_mask((_s), (n)))
53 
54 #define	BIT_COPY(_s, f, t)	(void)(*(t) = *(f))
55 
56 #define	BIT_ISSET(_s, n, p)						\
57 	((((p)->__bits[__bitset_word(_s, n)] & __bitset_mask((_s), (n))) != 0))
58 
59 #define	BIT_SET(_s, n, p)						\
60 	((p)->__bits[__bitset_word(_s, n)] |= __bitset_mask((_s), (n)))
61 
62 #define	BIT_ZERO(_s, p) do {						\
63 	__size_t __i;							\
64 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
65 		(p)->__bits[__i] = 0L;					\
66 } while (0)
67 
68 #define	BIT_FILL(_s, p) do {						\
69 	__size_t __i;							\
70 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
71 		(p)->__bits[__i] = -1L;					\
72 } while (0)
73 
74 #define	BIT_SETOF(_s, n, p) do {					\
75 	BIT_ZERO(_s, p);						\
76 	(p)->__bits[__bitset_word(_s, n)] = __bitset_mask((_s), (n));	\
77 } while (0)
78 
79 /* Is p empty. */
80 #define	BIT_EMPTY(_s, p) __extension__ ({				\
81 	__size_t __i;							\
82 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
83 		if ((p)->__bits[__i])					\
84 			break;						\
85 	__i == __bitset_words((_s));					\
86 })
87 
88 /* Is p full set. */
89 #define	BIT_ISFULLSET(_s, p) __extension__ ({				\
90 	__size_t __i;							\
91 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
92 		if ((p)->__bits[__i] != (long)-1)			\
93 			break;						\
94 	__i == __bitset_words((_s));					\
95 })
96 
97 /* Is c a subset of p. */
98 #define	BIT_SUBSET(_s, p, c) __extension__ ({				\
99 	__size_t __i;							\
100 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
101 		if (((c)->__bits[__i] &					\
102 		    (p)->__bits[__i]) !=				\
103 		    (c)->__bits[__i])					\
104 			break;						\
105 	__i == __bitset_words((_s));					\
106 })
107 
108 /* Are there any common bits between b & c? */
109 #define	BIT_OVERLAP(_s, p, c) __extension__ ({				\
110 	__size_t __i;							\
111 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
112 		if (((c)->__bits[__i] &					\
113 		    (p)->__bits[__i]) != 0)				\
114 			break;						\
115 	__i != __bitset_words((_s));					\
116 })
117 
118 /* Compare two sets, returns 0 if equal 1 otherwise. */
119 #define	BIT_CMP(_s, p, c) __extension__ ({				\
120 	__size_t __i;							\
121 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
122 		if (((c)->__bits[__i] !=				\
123 		    (p)->__bits[__i]))					\
124 			break;						\
125 	__i != __bitset_words((_s));					\
126 })
127 
128 #define	BIT_OR(_s, d, s) do {						\
129 	__size_t __i;							\
130 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
131 		(d)->__bits[__i] |= (s)->__bits[__i];			\
132 } while (0)
133 
134 #define	BIT_OR2(_s, d, s1, s2) do {					\
135 	__size_t __i;							\
136 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
137 		(d)->__bits[__i] = (s1)->__bits[__i] | (s2)->__bits[__i];\
138 } while (0)
139 
140 #define	BIT_AND(_s, d, s) do {						\
141 	__size_t __i;							\
142 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
143 		(d)->__bits[__i] &= (s)->__bits[__i];			\
144 } while (0)
145 
146 #define	BIT_AND2(_s, d, s1, s2) do {					\
147 	__size_t __i;							\
148 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
149 		(d)->__bits[__i] = (s1)->__bits[__i] & (s2)->__bits[__i];\
150 } while (0)
151 
152 #define	BIT_ANDNOT(_s, d, s) do {					\
153 	__size_t __i;							\
154 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
155 		(d)->__bits[__i] &= ~(s)->__bits[__i];			\
156 } while (0)
157 
158 #define	BIT_ANDNOT2(_s, d, s1, s2) do {					\
159 	__size_t __i;							\
160 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
161 		(d)->__bits[__i] = (s1)->__bits[__i] & ~(s2)->__bits[__i];\
162 } while (0)
163 
164 #define	BIT_XOR(_s, d, s) do {						\
165 	__size_t __i;							\
166 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
167 		(d)->__bits[__i] ^= (s)->__bits[__i];			\
168 } while (0)
169 
170 #define	BIT_XOR2(_s, d, s1, s2) do {					\
171 	__size_t __i;							\
172 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
173 		(d)->__bits[__i] = (s1)->__bits[__i] ^ (s2)->__bits[__i];\
174 } while (0)
175 
176 #define	BIT_CLR_ATOMIC(_s, n, p)					\
177 	atomic_clear_long(&(p)->__bits[__bitset_word(_s, n)],		\
178 	    __bitset_mask((_s), n))
179 
180 #define	BIT_SET_ATOMIC(_s, n, p)					\
181 	atomic_set_long(&(p)->__bits[__bitset_word(_s, n)],		\
182 	    __bitset_mask((_s), n))
183 
184 #define	BIT_SET_ATOMIC_ACQ(_s, n, p)					\
185 	atomic_set_acq_long(&(p)->__bits[__bitset_word(_s, n)],		\
186 	    __bitset_mask((_s), n))
187 
188 /* Convenience functions catering special cases. */
189 #define	BIT_AND_ATOMIC(_s, d, s) do {					\
190 	__size_t __i;							\
191 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
192 		atomic_clear_long(&(d)->__bits[__i],			\
193 		    ~(s)->__bits[__i]);					\
194 } while (0)
195 
196 #define	BIT_OR_ATOMIC(_s, d, s) do {					\
197 	__size_t __i;							\
198 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
199 		atomic_set_long(&(d)->__bits[__i],			\
200 		    (s)->__bits[__i]);					\
201 } while (0)
202 
203 #define	BIT_COPY_STORE_REL(_s, f, t) do {				\
204 	__size_t __i;							\
205 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
206 		atomic_store_rel_long(&(t)->__bits[__i],		\
207 		    (f)->__bits[__i]);					\
208 } while (0)
209 
210 #define	BIT_FFS(_s, p) __extension__ ({					\
211 	__size_t __i;							\
212 	int __bit;							\
213 									\
214 	__bit = 0;							\
215 	for (__i = 0; __i < __bitset_words((_s)); __i++) {		\
216 		if ((p)->__bits[__i] != 0) {				\
217 			__bit = ffsl((p)->__bits[__i]);			\
218 			__bit += __i * _BITSET_BITS;			\
219 			break;						\
220 		}							\
221 	}								\
222 	__bit;								\
223 })
224 
225 #define	BIT_FLS(_s, p) __extension__ ({					\
226 	__size_t __i;							\
227 	int __bit;							\
228 									\
229 	__bit = 0;							\
230 	for (__i = __bitset_words((_s)); __i > 0; __i--) {		\
231 		if ((p)->__bits[__i - 1] != 0) {			\
232 			__bit = flsl((p)->__bits[__i - 1]);		\
233 			__bit += (__i - 1) * _BITSET_BITS;		\
234 			break;						\
235 		}							\
236 	}								\
237 	__bit;								\
238 })
239 
240 #define	BIT_COUNT(_s, p) __extension__ ({				\
241 	__size_t __i;							\
242 	int __count;							\
243 									\
244 	__count = 0;							\
245 	for (__i = 0; __i < __bitset_words((_s)); __i++)		\
246 		__count += __bitcountl((p)->__bits[__i]);		\
247 	__count;							\
248 })
249 
250 #define	BITSET_T_INITIALIZER(x)						\
251 	{ .__bits = { x } }
252 
253 #define	BITSET_FSET(n)							\
254 	[ 0 ... ((n) - 1) ] = (-1L)
255 
256 #define	BITSET_SIZE(_s)	(__bitset_words((_s)) * sizeof(long))
257 
258 /*
259  * Dynamically allocate a bitset.
260  */
261 #define BITSET_ALLOC(_s, mt, mf)	malloc(BITSET_SIZE((_s)), mt, (mf))
262 
263 #endif /* !_SYS_BITSET_H_ */
264