2 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
20 #include <arpa/inet.h>
29 #include "openvswitch/util.h"
31 extern char *program_name;
33 #define __ARRAY_SIZE_NOCHECK(ARRAY) (sizeof(ARRAY) / sizeof((ARRAY)[0]))
35 /* return 0 for array types, 1 otherwise */
36 #define __ARRAY_CHECK(ARRAY) \
37 !__builtin_types_compatible_p(typeof(ARRAY), typeof(&ARRAY[0]))
39 /* compile-time fail if not array */
40 #define __ARRAY_FAIL(ARRAY) (sizeof(char[-2*!__ARRAY_CHECK(ARRAY)]))
41 #define __ARRAY_SIZE(ARRAY) \
42 __builtin_choose_expr(__ARRAY_CHECK(ARRAY), \
43 __ARRAY_SIZE_NOCHECK(ARRAY), __ARRAY_FAIL(ARRAY))
45 #define __ARRAY_SIZE(ARRAY) __ARRAY_SIZE_NOCHECK(ARRAY)
49 /* This system's cache line size, in bytes.
50 * Being wrong hurts performance but not correctness. */
51 #define CACHE_LINE_SIZE 64
52 BUILD_ASSERT_DECL(IS_POW2(CACHE_LINE_SIZE));
55 ovs_prefetch_range(const void *start, size_t size)
57 const char *addr = (const char *)start;
60 for (ofs = 0; ofs < size; ofs += CACHE_LINE_SIZE) {
61 OVS_PREFETCH(addr + ofs);
66 #define MIN(X, Y) ((X) < (Y) ? (X) : (Y))
70 #define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
73 #define OVS_NOT_REACHED() abort()
75 /* Use "%"PRIuSIZE to format size_t with printf(). */
93 typedef uint32_t HANDLE;
100 #define set_program_name(name) \
101 ovs_set_program_name(name, OVS_PACKAGE_VERSION)
103 const char *get_subprogram_name(void);
104 void set_subprogram_name(const char *);
106 void ovs_print_version(uint8_t min_ofp, uint8_t max_ofp);
108 OVS_NO_RETURN void out_of_memory(void);
109 void *xmalloc(size_t) MALLOC_LIKE;
110 void *xcalloc(size_t, size_t) MALLOC_LIKE;
111 void *xzalloc(size_t) MALLOC_LIKE;
112 void *xrealloc(void *, size_t);
113 void *xmemdup(const void *, size_t) MALLOC_LIKE;
114 char *xmemdup0(const char *, size_t) MALLOC_LIKE;
115 char *xstrdup(const char *) MALLOC_LIKE;
116 char *nullable_xstrdup(const char *) MALLOC_LIKE;
117 bool nullable_string_is_equal(const char *a, const char *b);
118 char *xasprintf(const char *format, ...) OVS_PRINTF_FORMAT(1, 2) MALLOC_LIKE;
119 char *xvasprintf(const char *format, va_list) OVS_PRINTF_FORMAT(1, 0) MALLOC_LIKE;
120 void *x2nrealloc(void *p, size_t *n, size_t s);
122 void *xmalloc_cacheline(size_t) MALLOC_LIKE;
123 void *xzalloc_cacheline(size_t) MALLOC_LIKE;
124 void free_cacheline(void *);
126 void ovs_strlcpy(char *dst, const char *src, size_t size);
127 void ovs_strzcpy(char *dst, const char *src, size_t size);
129 OVS_NO_RETURN void ovs_abort(int err_no, const char *format, ...)
130 OVS_PRINTF_FORMAT(2, 3);
131 OVS_NO_RETURN void ovs_abort_valist(int err_no, const char *format, va_list)
132 OVS_PRINTF_FORMAT(2, 0);
133 OVS_NO_RETURN void ovs_fatal(int err_no, const char *format, ...)
134 OVS_PRINTF_FORMAT(2, 3);
135 OVS_NO_RETURN void ovs_fatal_valist(int err_no, const char *format, va_list)
136 OVS_PRINTF_FORMAT(2, 0);
137 void ovs_error(int err_no, const char *format, ...) OVS_PRINTF_FORMAT(2, 3);
138 void ovs_error_valist(int err_no, const char *format, va_list)
139 OVS_PRINTF_FORMAT(2, 0);
140 const char *ovs_retval_to_string(int);
141 const char *ovs_strerror(int);
142 void ovs_hex_dump(FILE *, const void *, size_t, uintptr_t offset, bool ascii);
144 bool str_to_int(const char *, int base, int *);
145 bool str_to_long(const char *, int base, long *);
146 bool str_to_llong(const char *, int base, long long *);
147 bool str_to_uint(const char *, int base, unsigned int *);
149 bool ovs_scan(const char *s, const char *format, ...) OVS_SCANF_FORMAT(2, 3);
150 bool ovs_scan_len(const char *s, int *n, const char *format, ...);
152 bool str_to_double(const char *, double *);
154 int hexit_value(int c);
155 uintmax_t hexits_value(const char *s, size_t n, bool *ok);
157 int parse_int_string(const char *s, uint8_t *valuep, int field_width,
160 const char *english_list_delimiter(size_t index, size_t total);
164 char *dir_name(const char *file_name);
165 char *base_name(const char *file_name);
167 char *abs_file_name(const char *dir, const char *file_name);
169 char *follow_symlinks(const char *filename);
171 void ignore(bool x OVS_UNUSED);
175 /* Returns the number of trailing 0-bits in 'n'. Undefined if 'n' == 0. */
180 /* With GCC 4.7 on 32-bit x86, if a 32-bit integer is passed as 'n', using
181 * a plain __builtin_ctzll() here always generates an out-of-line function
182 * call. The test below helps it to emit a single 'bsf' instruction. */
183 return (__builtin_constant_p(n <= UINT32_MAX) && n <= UINT32_MAX
185 : __builtin_ctzll(n));
189 raw_clz64(uint64_t n)
191 return __builtin_clzll(n);
199 _BitScanForward64(&r, n);
202 unsigned long low = n, high, r = 0;
203 if (_BitScanForward(&r, low)) {
207 _BitScanForward(&r, high);
213 raw_clz64(uint64_t n)
217 _BitScanReverse64(&r, n);
220 unsigned long low, high = n >> 32, r = 0;
221 if (_BitScanReverse(&r, high)) {
225 _BitScanReverse(&r, low);
230 /* Defined in util.c. */
231 int raw_ctz(uint64_t n);
232 int raw_clz64(uint64_t n);
235 /* Returns the number of trailing 0-bits in 'n', or 32 if 'n' is 0. */
239 return n ? raw_ctz(n) : 32;
242 /* Returns the number of trailing 0-bits in 'n', or 64 if 'n' is 0. */
246 return n ? raw_ctz(n) : 64;
249 /* Returns the number of leading 0-bits in 'n', or 32 if 'n' is 0. */
253 return n ? raw_clz64(n) - 32 : 32;
256 /* Returns the number of leading 0-bits in 'n', or 64 if 'n' is 0. */
260 return n ? raw_clz64(n) : 64;
263 /* Given a word 'n', calculates floor(log_2('n')). This is equivalent
264 * to finding the bit position of the most significant one bit in 'n'. It is
265 * an error to call this function with 'n' == 0. */
267 log_2_floor(uint64_t n)
269 return 63 - raw_clz64(n);
272 /* Given a word 'n', calculates ceil(log_2('n')). It is an error to
273 * call this function with 'n' == 0. */
275 log_2_ceil(uint64_t n)
277 return log_2_floor(n) + !is_pow2(n);
280 /* unsigned int count_1bits(uint64_t x):
282 * Returns the number of 1-bits in 'x', between 0 and 64 inclusive. */
283 #if UINTPTR_MAX == UINT64_MAX
284 static inline unsigned int
285 count_1bits(uint64_t x)
287 #if __GNUC__ >= 4 && __POPCNT__
288 return __builtin_popcountll(x);
290 /* This portable implementation is the fastest one we know of for 64
291 * bits, and about 3x faster than GCC 4.7 __builtin_popcountll(). */
292 const uint64_t h55 = UINT64_C(0x5555555555555555);
293 const uint64_t h33 = UINT64_C(0x3333333333333333);
294 const uint64_t h0F = UINT64_C(0x0F0F0F0F0F0F0F0F);
295 const uint64_t h01 = UINT64_C(0x0101010101010101);
296 x -= (x >> 1) & h55; /* Count of each 2 bits in-place. */
297 x = (x & h33) + ((x >> 2) & h33); /* Count of each 4 bits in-place. */
298 x = (x + (x >> 4)) & h0F; /* Count of each 8 bits in-place. */
299 return (x * h01) >> 56; /* Sum of all bytes. */
302 #else /* Not 64-bit. */
303 #if __GNUC__ >= 4 && __POPCNT__
304 static inline unsigned int
305 count_1bits_32__(uint32_t x)
307 return __builtin_popcount(x);
310 #define NEED_COUNT_1BITS_8 1
311 extern const uint8_t count_1bits_8[256];
312 static inline unsigned int
313 count_1bits_32__(uint32_t x)
315 /* This portable implementation is the fastest one we know of for 32 bits,
316 * and faster than GCC __builtin_popcount(). */
317 return (count_1bits_8[x & 0xff] +
318 count_1bits_8[(x >> 8) & 0xff] +
319 count_1bits_8[(x >> 16) & 0xff] +
320 count_1bits_8[x >> 24]);
323 static inline unsigned int
324 count_1bits(uint64_t x)
326 return count_1bits_32__(x) + count_1bits_32__(x >> 32);
330 /* Returns the rightmost 1-bit in 'x' (e.g. 01011000 => 00001000), or 0 if 'x'
332 static inline uintmax_t
333 rightmost_1bit(uintmax_t x)
338 /* Returns 'x' with its rightmost 1-bit changed to a zero (e.g. 01011000 =>
339 * 01010000), or 0 if 'x' is 0. */
340 static inline uintmax_t
341 zero_rightmost_1bit(uintmax_t x)
346 /* Returns the index of the rightmost 1-bit in 'x' (e.g. 01011000 => 3), or an
347 * undefined value if 'x' is 0. */
349 rightmost_1bit_idx(uint64_t x)
354 /* Returns the index of the leftmost 1-bit in 'x' (e.g. 01011000 => 6), or an
355 * undefined value if 'x' is 0. */
356 static inline uint32_t
357 leftmost_1bit_idx(uint64_t x)
359 return log_2_floor(x);
362 /* Return a ovs_be32 prefix in network byte order with 'plen' highest bits set.
363 * Shift with 32 is undefined behavior, but we rather use 64-bit shift than
365 static inline ovs_be32 be32_prefix_mask(int plen)
367 return htonl((uint64_t)UINT32_MAX << (32 - plen));
370 bool is_all_zeros(const void *, size_t);
371 bool is_all_ones(const void *, size_t);
372 void bitwise_copy(const void *src, unsigned int src_len, unsigned int src_ofs,
373 void *dst, unsigned int dst_len, unsigned int dst_ofs,
374 unsigned int n_bits);
375 void bitwise_zero(void *dst_, unsigned int dst_len, unsigned dst_ofs,
376 unsigned int n_bits);
377 void bitwise_one(void *dst_, unsigned int dst_len, unsigned dst_ofs,
378 unsigned int n_bits);
379 bool bitwise_is_all_zeros(const void *, unsigned int len, unsigned int ofs,
380 unsigned int n_bits);
381 unsigned int bitwise_scan(const void *, unsigned int len,
382 bool target, unsigned int start, unsigned int end);
383 int bitwise_rscan(const void *, unsigned int len, bool target,
385 void bitwise_put(uint64_t value,
386 void *dst, unsigned int dst_len, unsigned int dst_ofs,
387 unsigned int n_bits);
388 uint64_t bitwise_get(const void *src, unsigned int src_len,
389 unsigned int src_ofs, unsigned int n_bits);
390 bool bitwise_get_bit(const void *src, unsigned int len, unsigned int ofs);
391 void bitwise_put0(void *dst, unsigned int len, unsigned int ofs);
392 void bitwise_put1(void *dst, unsigned int len, unsigned int ofs);
393 void bitwise_put_bit(void *dst, unsigned int len, unsigned int ofs, bool);
394 void bitwise_toggle_bit(void *dst, unsigned int len, unsigned int ofs);
396 /* Returns non-zero if the parameters have equal value. */
398 ovs_u128_equals(const ovs_u128 a, const ovs_u128 b)
400 return (a.u64.hi == b.u64.hi) && (a.u64.lo == b.u64.lo);
403 /* Returns true if 'val' is 0. */
405 ovs_u128_is_zero(const ovs_u128 val)
407 return !(val.u64.hi || val.u64.lo);
410 /* Returns true if 'val' is all ones. */
412 ovs_u128_is_ones(const ovs_u128 val)
414 return ovs_u128_equals(val, OVS_U128_MAX);
417 /* Returns non-zero if the parameters have equal value. */
419 ovs_be128_equals(const ovs_be128 a, const ovs_be128 b)
421 return (a.be64.hi == b.be64.hi) && (a.be64.lo == b.be64.lo);
424 /* Returns true if 'val' is 0. */
426 ovs_be128_is_zero(const ovs_be128 val)
428 return !(val.be64.hi || val.be64.lo);
431 static inline ovs_u128
432 ovs_u128_and(const ovs_u128 a, const ovs_u128 b)
436 dst.u64.hi = a.u64.hi & b.u64.hi;
437 dst.u64.lo = a.u64.lo & b.u64.lo;
442 void xsleep(unsigned int seconds);
444 bool is_stdout_a_tty(void);
448 char *ovs_format_message(int error);
449 char *ovs_lasterror_to_string(void);
450 int ftruncate(int fd, off_t length);