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
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
|
/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#pragma once
#include <inttypes.h>
/*! \file isc/util.h
* NOTE:
*
* This file is not to be included from any <isc/???.h> (or other) library
* files.
*
* \brief
* Including this file puts several macros in your name space that are
* not protected (as all the other ISC functions/macros do) by prepending
* ISC_ or isc_ to the name.
*/
/***
*** Clang Compatibility Macros
***/
#if !defined(__has_attribute)
#define __has_attribute(x) 0
#endif /* if !defined(__has_attribute) */
#if !defined(__has_c_attribute)
#define __has_c_attribute(x) 0
#endif /* if !defined(__has_c_attribute) */
#if !defined(__has_feature)
#define __has_feature(x) 0
#endif /* if !defined(__has_feature) */
/***
*** General Macros.
***/
/*%
* Use this to hide unused function arguments.
* \code
* int
* foo(char *bar)
* {
* UNUSED(bar);
* }
* \endcode
*/
#define UNUSED(x) (void)(x)
#if __GNUC__ >= 8 && !defined(__clang__)
#define ISC_NONSTRING __attribute__((nonstring))
#else /* if __GNUC__ >= 8 && !defined(__clang__) */
#define ISC_NONSTRING
#endif /* __GNUC__ */
#if __has_c_attribute(fallthrough)
#define FALLTHROUGH [[fallthrough]]
#elif __GNUC__ >= 7 && !defined(__clang__)
#define FALLTHROUGH __attribute__((fallthrough))
#else
/* clang-format off */
#define FALLTHROUGH do {} while (0) /* FALLTHROUGH */
/* clang-format on */
#endif
#if HAVE_FUNC_ATTRIBUTE_CONSTRUCTOR && HAVE_FUNC_ATTRIBUTE_DESTRUCTOR
#define ISC_CONSTRUCTOR __attribute__((constructor))
#define ISC_DESTRUCTOR __attribute__((destructor))
#else
#define ISC_CONSTRUCTOR
#define ISC_DESTRUCTOR
#endif
/*%
* The opposite: silent warnings about stored values which are never read.
*/
#define POST(x) (void)(x)
#define ISC_MAX(a, b) ((a) > (b) ? (a) : (b))
#define ISC_MIN(a, b) ((a) < (b) ? (a) : (b))
#define ISC_CLAMP(v, x, y) ((v) < (x) ? (x) : ((v) > (y) ? (y) : (v)))
/*%
* Use this to remove the const qualifier of a variable to assign it to
* a non-const variable or pass it as a non-const function argument ...
* but only when you are sure it won't then be changed!
* This is necessary to sometimes shut up some compilers
* (as with gcc -Wcast-qual) when there is just no other good way to avoid the
* situation.
*/
#define DE_CONST(konst, var) \
do { \
union { \
const void *k; \
void *v; \
} _u; \
_u.k = konst; \
var = _u.v; \
} while (0)
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
/*%
* Use this in translation units that would otherwise be empty, to
* suppress compiler warnings.
*/
#define EMPTY_TRANSLATION_UNIT extern int isc__empty;
/*%
* We use macros instead of calling the routines directly because
* the capital letters make the locking stand out.
* We RUNTIME_CHECK for success since in general there's no way
* for us to continue if they fail.
*/
#ifdef ISC_UTIL_TRACEON
#define ISC_UTIL_TRACE(a) a
#include <stdio.h> /* Required for fprintf/stderr when tracing. */
#else /* ifdef ISC_UTIL_TRACEON */
#define ISC_UTIL_TRACE(a)
#endif /* ifdef ISC_UTIL_TRACEON */
#include <isc/result.h> /* Contractual promise. */
#define LOCK(lp) \
do { \
ISC_UTIL_TRACE(fprintf(stderr, "LOCKING %p %s %d\n", (lp), \
__FILE__, __LINE__)); \
RUNTIME_CHECK(isc_mutex_lock((lp)) == ISC_R_SUCCESS); \
ISC_UTIL_TRACE(fprintf(stderr, "LOCKED %p %s %d\n", (lp), \
__FILE__, __LINE__)); \
} while (0)
#define UNLOCK(lp) \
do { \
RUNTIME_CHECK(isc_mutex_unlock((lp)) == ISC_R_SUCCESS); \
ISC_UTIL_TRACE(fprintf(stderr, "UNLOCKED %p %s %d\n", (lp), \
__FILE__, __LINE__)); \
} while (0)
#define BROADCAST(cvp) \
do { \
ISC_UTIL_TRACE(fprintf(stderr, "BROADCAST %p %s %d\n", (cvp), \
__FILE__, __LINE__)); \
RUNTIME_CHECK(isc_condition_broadcast((cvp)) == \
ISC_R_SUCCESS); \
} while (0)
#define SIGNAL(cvp) \
do { \
ISC_UTIL_TRACE(fprintf(stderr, "SIGNAL %p %s %d\n", (cvp), \
__FILE__, __LINE__)); \
RUNTIME_CHECK(isc_condition_signal((cvp)) == ISC_R_SUCCESS); \
} while (0)
#define WAIT(cvp, lp) \
do { \
ISC_UTIL_TRACE(fprintf(stderr, "WAIT %p LOCK %p %s %d\n", \
(cvp), (lp), __FILE__, __LINE__)); \
RUNTIME_CHECK(isc_condition_wait((cvp), (lp)) == \
ISC_R_SUCCESS); \
ISC_UTIL_TRACE(fprintf(stderr, "WAITED %p LOCKED %p %s %d\n", \
(cvp), (lp), __FILE__, __LINE__)); \
} while (0)
/*
* isc_condition_waituntil can return ISC_R_TIMEDOUT, so we
* don't RUNTIME_CHECK the result.
*
* XXX Also, can't really debug this then...
*/
#define WAITUNTIL(cvp, lp, tp) isc_condition_waituntil((cvp), (lp), (tp))
#define RWLOCK(lp, t) \
do { \
ISC_UTIL_TRACE(fprintf(stderr, "RWLOCK %p, %d %s %d\n", (lp), \
(t), __FILE__, __LINE__)); \
RUNTIME_CHECK(isc_rwlock_lock((lp), (t)) == ISC_R_SUCCESS); \
ISC_UTIL_TRACE(fprintf(stderr, "RWLOCKED %p, %d %s %d\n", \
(lp), (t), __FILE__, __LINE__)); \
} while (0)
#define RWUNLOCK(lp, t) \
do { \
ISC_UTIL_TRACE(fprintf(stderr, "RWUNLOCK %p, %d %s %d\n", \
(lp), (t), __FILE__, __LINE__)); \
RUNTIME_CHECK(isc_rwlock_unlock((lp), (t)) == ISC_R_SUCCESS); \
} while (0)
/*
* List Macros.
*/
#include <isc/list.h> /* Contractual promise. */
#define LIST(type) ISC_LIST(type)
#define INIT_LIST(type) ISC_LIST_INIT(type)
#define LINK(type) ISC_LINK(type)
#define INIT_LINK(elt, link) ISC_LINK_INIT(elt, link)
#define HEAD(list) ISC_LIST_HEAD(list)
#define TAIL(list) ISC_LIST_TAIL(list)
#define EMPTY(list) ISC_LIST_EMPTY(list)
#define PREV(elt, link) ISC_LIST_PREV(elt, link)
#define NEXT(elt, link) ISC_LIST_NEXT(elt, link)
#define APPEND(list, elt, link) ISC_LIST_APPEND(list, elt, link)
#define PREPEND(list, elt, link) ISC_LIST_PREPEND(list, elt, link)
#define UNLINK(list, elt, link) ISC_LIST_UNLINK(list, elt, link)
#define ENQUEUE(list, elt, link) ISC_LIST_APPEND(list, elt, link)
#define DEQUEUE(list, elt, link) ISC_LIST_UNLINK(list, elt, link)
#define INSERTBEFORE(li, b, e, ln) ISC_LIST_INSERTBEFORE(li, b, e, ln)
#define INSERTAFTER(li, a, e, ln) ISC_LIST_INSERTAFTER(li, a, e, ln)
#define APPENDLIST(list1, list2, link) ISC_LIST_APPENDLIST(list1, list2, link)
/*%
* Performance
*/
/* GCC defines __SANITIZE_ADDRESS__, so reuse the macro for clang */
#if __has_feature(address_sanitizer)
#define __SANITIZE_ADDRESS__ 1
#endif /* if __has_feature(address_sanitizer) */
#if __has_feature(thread_sanitizer)
#define __SANITIZE_THREAD__ 1
#endif /* if __has_feature(thread_sanitizer) */
#if __SANITIZE_THREAD__
#define ISC_NO_SANITIZE_THREAD __attribute__((no_sanitize("thread")))
#else /* if __SANITIZE_THREAD__ */
#define ISC_NO_SANITIZE_THREAD
#endif /* if __SANITIZE_THREAD__ */
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR >= 6)
#define STATIC_ASSERT(cond, msg) _Static_assert(cond, msg)
#elif __has_feature(c_static_assert)
#define STATIC_ASSERT(cond, msg) _Static_assert(cond, msg)
#else /* if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR >= 6) */
/* Courtesy of Joseph Quinsey: https://godbolt.org/z/K9RvWS */
#define TOKENPASTE(a, b) a##b /* "##" is the "Token Pasting Operator" */
#define EXPAND_THEN_PASTE(a, b) TOKENPASTE(a, b) /* expand then paste */
#define STATIC_ASSERT(x, msg) \
enum { EXPAND_THEN_PASTE(ASSERT_line_, __LINE__) = 1 / ((msg) && (x)) }
#endif /* if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR >= 6) */
#ifdef UNIT_TESTING
extern void
mock_assert(const int result, const char *const expression,
const char *const file, const int line);
/*
* Allow clang to determine that the following code is not reached
* by calling abort() if the condition fails. The abort() will
* never be executed as mock_assert() and _assert_true() longjmp
* or exit if the condition is false.
*/
#define REQUIRE(expression) \
((!(expression)) \
? (mock_assert(0, #expression, __FILE__, __LINE__), abort()) \
: (void)0)
#define ENSURE(expression) \
((!(int)(expression)) \
? (mock_assert(0, #expression, __FILE__, __LINE__), abort()) \
: (void)0)
#define INSIST(expression) \
((!(expression)) \
? (mock_assert(0, #expression, __FILE__, __LINE__), abort()) \
: (void)0)
#define INVARIANT(expression) \
((!(expression)) \
? (mock_assert(0, #expression, __FILE__, __LINE__), abort()) \
: (void)0)
#define UNREACHABLE() \
(mock_assert(0, "unreachable", __FILE__, __LINE__), abort())
#define _assert_true(c, e, f, l) \
((c) ? (void)0 : (_assert_true(0, e, f, l), abort()))
#define _assert_int_equal(a, b, f, l) \
(((a) == (b)) ? (void)0 : (_assert_int_equal(a, b, f, l), abort()))
#define _assert_int_not_equal(a, b, f, l) \
(((a) != (b)) ? (void)0 : (_assert_int_not_equal(a, b, f, l), abort()))
#else /* UNIT_TESTING */
/*
* Assertions
*/
#include <isc/assertions.h> /* Contractual promise. */
/*% Require Assertion */
#define REQUIRE(e) ISC_REQUIRE(e)
/*% Ensure Assertion */
#define ENSURE(e) ISC_ENSURE(e)
/*% Insist Assertion */
#define INSIST(e) ISC_INSIST(e)
/*% Invariant Assertion */
#define INVARIANT(e) ISC_INVARIANT(e)
#define UNREACHABLE() ISC_UNREACHABLE()
#endif /* UNIT_TESTING */
/*
* Errors
*/
#include <isc/error.h> /* Contractual promise. */
#include <isc/strerr.h> /* for ISC_STRERRORSIZE */
#define UNEXPECTED_ERROR(...) \
isc_error_unexpected(__FILE__, __LINE__, __func__, __VA_ARGS__)
#define FATAL_ERROR(...) \
isc_error_fatal(__FILE__, __LINE__, __func__, __VA_ARGS__)
#define REPORT_SYSERROR(report, err, fmt, ...) \
{ \
char strerr[ISC_STRERRORSIZE]; \
strerror_r(err, strerr, sizeof(strerr)); \
report(__FILE__, __LINE__, __func__, fmt ": %s (%d)", \
##__VA_ARGS__, strerr, err); \
}
#define UNEXPECTED_SYSERROR(err, ...) \
REPORT_SYSERROR(isc_error_unexpected, err, __VA_ARGS__)
#define FATAL_SYSERROR(err, ...) \
REPORT_SYSERROR(isc_error_fatal, err, __VA_ARGS__)
#ifdef UNIT_TESTING
#define RUNTIME_CHECK(cond) \
((cond) ? (void)0 \
: (mock_assert(0, #cond, __FILE__, __LINE__), abort()))
#else /* UNIT_TESTING */
#define RUNTIME_CHECK(cond) \
((cond) ? (void)0 : FATAL_ERROR("RUNTIME_CHECK(%s) failed", #cond))
#endif /* UNIT_TESTING */
/*%
* Time
*/
#define TIME_NOW(tp) RUNTIME_CHECK(isc_time_now((tp)) == ISC_R_SUCCESS)
#define TIME_NOW_HIRES(tp) \
RUNTIME_CHECK(isc_time_now_hires((tp)) == ISC_R_SUCCESS)
/*%
* Alignment
*/
#ifdef __GNUC__
#define ISC_ALIGN(x, a) (((x) + (a)-1) & ~((typeof(x))(a)-1))
#else /* ifdef __GNUC__ */
#define ISC_ALIGN(x, a) (((x) + (a)-1) & ~((uintmax_t)(a)-1))
#endif /* ifdef __GNUC__ */
/*%
* Misc
*/
#include <isc/deprecated.h>
/*%
* Swap
*/
#define ISC_SWAP(a, b) \
{ \
typeof(a) __tmp_swap = a; \
a = b; \
b = __tmp_swap; \
}
|
