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git.ipfire.org Git - thirdparty/systemd.git/blob - src/basic/macro.h
1 /* SPDX-License-Identifier: LGPL-2.1+ */
7 #include <sys/sysmacros.h>
10 #define _printf_(a, b) __attribute__ ((format (printf, a, b)))
14 # define _alloc_(...) __attribute__ ((alloc_size(__VA_ARGS__)))
16 #define _sentinel_ __attribute__ ((sentinel))
17 #define _unused_ __attribute__ ((unused))
18 #define _destructor_ __attribute__ ((destructor))
19 #define _pure_ __attribute__ ((pure))
20 #define _const_ __attribute__ ((const))
21 #define _deprecated_ __attribute__ ((deprecated))
22 #define _packed_ __attribute__ ((packed))
23 #define _malloc_ __attribute__ ((malloc))
24 #define _weak_ __attribute__ ((weak))
25 #define _likely_(x) (__builtin_expect(!!(x), 1))
26 #define _unlikely_(x) (__builtin_expect(!!(x), 0))
27 #define _public_ __attribute__ ((visibility("default")))
28 #define _hidden_ __attribute__ ((visibility("hidden")))
29 #define _weakref_(x) __attribute__((weakref(#x)))
30 #define _alignas_(x) __attribute__((aligned(__alignof(x))))
31 #define _cleanup_(x) __attribute__((cleanup(x)))
33 #define _fallthrough_ __attribute__((fallthrough))
37 /* Define C11 noreturn without <stdnoreturn.h> and even on older gcc
38 * compiler versions */
40 #if __STDC_VERSION__ >= 201112L
41 #define _noreturn_ _Noreturn
43 #define _noreturn_ __attribute__((noreturn))
47 #if !defined(HAS_FEATURE_MEMORY_SANITIZER)
48 # if defined(__has_feature)
49 # if __has_feature(memory_sanitizer)
50 # define HAS_FEATURE_MEMORY_SANITIZER 1
53 # if !defined(HAS_FEATURE_MEMORY_SANITIZER)
54 # define HAS_FEATURE_MEMORY_SANITIZER 0
58 /* Temporarily disable some warnings */
59 #define DISABLE_WARNING_FORMAT_NONLITERAL \
60 _Pragma("GCC diagnostic push"); \
61 _Pragma("GCC diagnostic ignored \"-Wformat-nonliteral\"")
63 #define DISABLE_WARNING_MISSING_PROTOTYPES \
64 _Pragma("GCC diagnostic push"); \
65 _Pragma("GCC diagnostic ignored \"-Wmissing-prototypes\"")
67 #define DISABLE_WARNING_NONNULL \
68 _Pragma("GCC diagnostic push"); \
69 _Pragma("GCC diagnostic ignored \"-Wnonnull\"")
71 #define DISABLE_WARNING_SHADOW \
72 _Pragma("GCC diagnostic push"); \
73 _Pragma("GCC diagnostic ignored \"-Wshadow\"")
75 #define DISABLE_WARNING_INCOMPATIBLE_POINTER_TYPES \
76 _Pragma("GCC diagnostic push"); \
77 _Pragma("GCC diagnostic ignored \"-Wincompatible-pointer-types\"")
79 #define REENABLE_WARNING \
80 _Pragma("GCC diagnostic pop")
82 /* automake test harness */
83 #define EXIT_TEST_SKIP 77
85 #define XSTRINGIFY(x) #x
86 #define STRINGIFY(x) XSTRINGIFY(x)
88 #define XCONCATENATE(x, y) x ## y
89 #define CONCATENATE(x, y) XCONCATENATE(x, y)
91 #define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq))
92 #define UNIQ __COUNTER__
95 #if __SIZEOF_INT__ == 4
96 #define BUILTIN_FFS_U32(x) __builtin_ffs(x);
97 #elif __SIZEOF_LONG__ == 4
98 #define BUILTIN_FFS_U32(x) __builtin_ffsl(x);
100 #error "neither int nor long are four bytes long?!?"
105 #define ALIGN4(l) (((l) + 3) & ~3)
106 #define ALIGN8(l) (((l) + 7) & ~7)
108 #if __SIZEOF_POINTER__ == 8
109 #define ALIGN(l) ALIGN8(l)
110 #elif __SIZEOF_POINTER__ == 4
111 #define ALIGN(l) ALIGN4(l)
113 #error "Wut? Pointers are neither 4 nor 8 bytes long?"
116 #define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) (p)))
117 #define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) (p)))
118 #define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) (p)))
120 static inline size_t ALIGN_TO(size_t l
, size_t ali
) {
121 return ((l
+ ali
- 1) & ~(ali
- 1));
124 #define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) (p), (ali)))
126 /* align to next higher power-of-2 (except for: 0 => 0, overflow => 0) */
127 static inline unsigned long ALIGN_POWER2(unsigned long u
) {
128 /* clz(0) is undefined */
132 /* left-shift overflow is undefined */
133 if (__builtin_clzl(u
- 1UL) < 1)
136 return 1UL << (sizeof(u
) * 8 - __builtin_clzl(u
- 1UL));
140 # define VOID_0 ((void)0)
142 # define VOID_0 ((void*)0)
145 #define ELEMENTSOF(x) \
146 (__builtin_choose_expr( \
147 !__builtin_types_compatible_p(typeof(x), typeof(&*(x))), \
148 sizeof(x)/sizeof((x)[0]), \
152 * STRLEN - return the length of a string literal, minus the trailing NUL byte.
153 * Contrary to strlen(), this is a constant expression.
154 * @x: a string literal.
156 #define STRLEN(x) (sizeof(""x"") - 1)
159 * container_of - cast a member of a structure out to the containing structure
160 * @ptr: the pointer to the member.
161 * @type: the type of the container struct this is embedded in.
162 * @member: the name of the member within the struct.
164 #define container_of(ptr, type, member) __container_of(UNIQ, (ptr), type, member)
165 #define __container_of(uniq, ptr, type, member) \
167 const typeof( ((type*)0)->member ) *UNIQ_T(A, uniq) = (ptr); \
168 (type*)( (char *)UNIQ_T(A, uniq) - offsetof(type, member) ); \
172 #define MAX(a, b) __MAX(UNIQ, (a), UNIQ, (b))
173 #define __MAX(aq, a, bq, b) \
175 const typeof(a) UNIQ_T(A, aq) = (a); \
176 const typeof(b) UNIQ_T(B, bq) = (b); \
177 UNIQ_T(A, aq) > UNIQ_T(B, bq) ? UNIQ_T(A, aq) : UNIQ_T(B, bq); \
180 /* evaluates to (void) if _A or _B are not constant or of different types */
181 #define CONST_MAX(_A, _B) \
182 (__builtin_choose_expr( \
183 __builtin_constant_p(_A) && \
184 __builtin_constant_p(_B) && \
185 __builtin_types_compatible_p(typeof(_A), typeof(_B)), \
186 ((_A) > (_B)) ? (_A) : (_B), \
189 /* takes two types and returns the size of the larger one */
190 #define MAXSIZE(A, B) (sizeof(union _packed_ { typeof(A) a; typeof(B) b; }))
192 #define MAX3(x, y, z) \
194 const typeof(x) _c = MAX(x, y); \
199 #define MIN(a, b) __MIN(UNIQ, (a), UNIQ, (b))
200 #define __MIN(aq, a, bq, b) \
202 const typeof(a) UNIQ_T(A, aq) = (a); \
203 const typeof(b) UNIQ_T(B, bq) = (b); \
204 UNIQ_T(A, aq) < UNIQ_T(B, bq) ? UNIQ_T(A, aq) : UNIQ_T(B, bq); \
207 #define MIN3(x, y, z) \
209 const typeof(x) _c = MIN(x, y); \
213 #define LESS_BY(a, b) __LESS_BY(UNIQ, (a), UNIQ, (b))
214 #define __LESS_BY(aq, a, bq, b) \
216 const typeof(a) UNIQ_T(A, aq) = (a); \
217 const typeof(b) UNIQ_T(B, bq) = (b); \
218 UNIQ_T(A, aq) > UNIQ_T(B, bq) ? UNIQ_T(A, aq) - UNIQ_T(B, bq) : 0; \
221 #define CMP(a, b) __CMP(UNIQ, (a), UNIQ, (b))
222 #define __CMP(aq, a, bq, b) \
224 const typeof(a) UNIQ_T(A, aq) = (a); \
225 const typeof(b) UNIQ_T(B, bq) = (b); \
226 UNIQ_T(A, aq) < UNIQ_T(B, bq) ? -1 : \
227 UNIQ_T(A, aq) > UNIQ_T(B, bq) ? 1 : 0; \
231 #define CLAMP(x, low, high) __CLAMP(UNIQ, (x), UNIQ, (low), UNIQ, (high))
232 #define __CLAMP(xq, x, lowq, low, highq, high) \
234 const typeof(x) UNIQ_T(X, xq) = (x); \
235 const typeof(low) UNIQ_T(LOW, lowq) = (low); \
236 const typeof(high) UNIQ_T(HIGH, highq) = (high); \
237 UNIQ_T(X, xq) > UNIQ_T(HIGH, highq) ? \
238 UNIQ_T(HIGH, highq) : \
239 UNIQ_T(X, xq) < UNIQ_T(LOW, lowq) ? \
240 UNIQ_T(LOW, lowq) : \
244 /* [(x + y - 1) / y] suffers from an integer overflow, even though the
245 * computation should be possible in the given type. Therefore, we use
246 * [x / y + !!(x % y)]. Note that on "Real CPUs" a division returns both the
247 * quotient and the remainder, so both should be equally fast. */
248 #define DIV_ROUND_UP(_x, _y) \
250 const typeof(_x) __x = (_x); \
251 const typeof(_y) __y = (_y); \
252 (__x / __y + !!(__x % __y)); \
257 /* Use special definitions of assertion macros in order to prevent
258 * false positives of ASSERT_SIDE_EFFECT on Coverity static analyzer
259 * for uses of assert_se() and assert_return().
261 * These definitions make expression go through a (trivial) function
262 * call to ensure they are not discarded. Also use ! or !! to ensure
263 * the boolean expressions are seen as such.
265 * This technique has been described and recommended in:
266 * https://community.synopsys.com/s/question/0D534000046Yuzb/suppressing-assertsideeffect-for-functions-that-allow-for-sideeffects
269 extern void __coverity_panic__(void);
271 static inline int __coverity_check__(int condition
) {
275 #define assert_message_se(expr, message) \
277 if (__coverity_check__(!(expr))) \
278 __coverity_panic__(); \
281 #define assert_log(expr, message) __coverity_check__(!!(expr))
283 #else /* ! __COVERITY__ */
285 #define assert_message_se(expr, message) \
287 if (_unlikely_(!(expr))) \
288 log_assert_failed(message, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
291 #define assert_log(expr, message) ((_likely_(expr)) \
293 : (log_assert_failed_return(message, __FILE__, __LINE__, __PRETTY_FUNCTION__), false))
295 #endif /* __COVERITY__ */
297 #define assert_se(expr) assert_message_se(expr, #expr)
299 /* We override the glibc assert() here. */
302 #define assert(expr) do {} while (false)
304 #define assert(expr) assert_message_se(expr, #expr)
307 #define assert_not_reached(t) \
309 log_assert_failed_unreachable(t, __FILE__, __LINE__, __PRETTY_FUNCTION__); \
312 #if defined(static_assert)
313 #define assert_cc(expr) \
314 static_assert(expr, #expr);
316 #define assert_cc(expr) \
317 struct CONCATENATE(_assert_struct_, __COUNTER__) { \
318 char x[(expr) ? 0 : -1]; \
322 #define assert_return(expr, r) \
324 if (!assert_log(expr, #expr)) \
328 #define assert_return_errno(expr, r, err) \
330 if (!assert_log(expr, #expr)) { \
336 #define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
337 #define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
338 #define PTR_TO_UINT(p) ((unsigned) ((uintptr_t) (p)))
339 #define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
341 #define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
342 #define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
343 #define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
344 #define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))
346 #define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
347 #define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
348 #define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
349 #define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))
351 #define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
352 #define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
353 #define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
354 #define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))
356 #define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p)))
357 #define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u)))
359 #define CHAR_TO_STR(x) ((char[2]) { x, 0 })
361 #define char_array_0(x) x[sizeof(x)-1] = 0;
363 /* Returns the number of chars needed to format variables of the
364 * specified type as a decimal string. Adds in extra space for a
365 * negative '-' prefix (hence works correctly on signed
366 * types). Includes space for the trailing NUL. */
367 #define DECIMAL_STR_MAX(type) \
368 (2+(sizeof(type) <= 1 ? 3 : \
369 sizeof(type) <= 2 ? 5 : \
370 sizeof(type) <= 4 ? 10 : \
371 sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
373 #define DECIMAL_STR_WIDTH(x) \
375 typeof(x) _x_ = (x); \
377 while ((_x_ /= 10) != 0) \
382 #define SET_FLAG(v, flag, b) \
383 (v) = (b) ? ((v) | (flag)) : ((v) & ~(flag))
384 #define FLAGS_SET(v, flags) \
385 (((v) & (flags)) == (flags))
387 #define CASE_F(X) case X:
388 #define CASE_F_1(CASE, X) CASE_F(X)
389 #define CASE_F_2(CASE, X, ...) CASE(X) CASE_F_1(CASE, __VA_ARGS__)
390 #define CASE_F_3(CASE, X, ...) CASE(X) CASE_F_2(CASE, __VA_ARGS__)
391 #define CASE_F_4(CASE, X, ...) CASE(X) CASE_F_3(CASE, __VA_ARGS__)
392 #define CASE_F_5(CASE, X, ...) CASE(X) CASE_F_4(CASE, __VA_ARGS__)
393 #define CASE_F_6(CASE, X, ...) CASE(X) CASE_F_5(CASE, __VA_ARGS__)
394 #define CASE_F_7(CASE, X, ...) CASE(X) CASE_F_6(CASE, __VA_ARGS__)
395 #define CASE_F_8(CASE, X, ...) CASE(X) CASE_F_7(CASE, __VA_ARGS__)
396 #define CASE_F_9(CASE, X, ...) CASE(X) CASE_F_8(CASE, __VA_ARGS__)
397 #define CASE_F_10(CASE, X, ...) CASE(X) CASE_F_9(CASE, __VA_ARGS__)
398 #define CASE_F_11(CASE, X, ...) CASE(X) CASE_F_10(CASE, __VA_ARGS__)
399 #define CASE_F_12(CASE, X, ...) CASE(X) CASE_F_11(CASE, __VA_ARGS__)
400 #define CASE_F_13(CASE, X, ...) CASE(X) CASE_F_12(CASE, __VA_ARGS__)
401 #define CASE_F_14(CASE, X, ...) CASE(X) CASE_F_13(CASE, __VA_ARGS__)
402 #define CASE_F_15(CASE, X, ...) CASE(X) CASE_F_14(CASE, __VA_ARGS__)
403 #define CASE_F_16(CASE, X, ...) CASE(X) CASE_F_15(CASE, __VA_ARGS__)
404 #define CASE_F_17(CASE, X, ...) CASE(X) CASE_F_16(CASE, __VA_ARGS__)
405 #define CASE_F_18(CASE, X, ...) CASE(X) CASE_F_17(CASE, __VA_ARGS__)
406 #define CASE_F_19(CASE, X, ...) CASE(X) CASE_F_18(CASE, __VA_ARGS__)
407 #define CASE_F_20(CASE, X, ...) CASE(X) CASE_F_19(CASE, __VA_ARGS__)
409 #define GET_CASE_F(_1,_2,_3,_4,_5,_6,_7,_8,_9,_10,_11,_12,_13,_14,_15,_16,_17,_18,_19,_20,NAME,...) NAME
410 #define FOR_EACH_MAKE_CASE(...) \
411 GET_CASE_F(__VA_ARGS__,CASE_F_20,CASE_F_19,CASE_F_18,CASE_F_17,CASE_F_16,CASE_F_15,CASE_F_14,CASE_F_13,CASE_F_12,CASE_F_11, \
412 CASE_F_10,CASE_F_9,CASE_F_8,CASE_F_7,CASE_F_6,CASE_F_5,CASE_F_4,CASE_F_3,CASE_F_2,CASE_F_1) \
415 #define IN_SET(x, ...) \
417 bool _found = false; \
418 /* If the build breaks in the line below, you need to extend the case macros. (We use "long double" as \
419 * type for the array, in the hope that checkers such as ubsan don't complain that the initializers for \
420 * the array are not representable by the base type. Ideally we'd use typeof(x) as base type, but that \
421 * doesn't work, as we want to use this on bitfields and gcc refuses typeof() on bitfields.) */ \
422 assert_cc((sizeof((long double[]){__VA_ARGS__})/sizeof(long double)) <= 20); \
424 FOR_EACH_MAKE_CASE(__VA_ARGS__) \
433 #define SWAP_TWO(x, y) do { \
434 typeof(x) _t = (x); \
439 /* Define C11 thread_local attribute even on older gcc compiler
443 * Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__
444 * see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769
446 #if __STDC_VERSION__ >= 201112L && !(defined(__STDC_NO_THREADS__) || (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16))
447 #define thread_local _Thread_local
449 #define thread_local __thread
453 #define DEFINE_TRIVIAL_CLEANUP_FUNC(type, func) \
454 static inline void func##p(type *p) { \
459 #define _DEFINE_TRIVIAL_REF_FUNC(type, name, scope) \
460 scope type *name##_ref(type *p) { \
464 assert(p->n_ref > 0); \
469 #define _DEFINE_TRIVIAL_UNREF_FUNC(type, name, free_func, scope) \
470 scope type *name##_unref(type *p) { \
474 assert(p->n_ref > 0); \
479 return free_func(p); \
482 #define DEFINE_TRIVIAL_REF_FUNC(type, name) \
483 _DEFINE_TRIVIAL_REF_FUNC(type, name,)
484 #define DEFINE_PRIVATE_TRIVIAL_REF_FUNC(type, name) \
485 _DEFINE_TRIVIAL_REF_FUNC(type, name, static)
486 #define DEFINE_PUBLIC_TRIVIAL_REF_FUNC(type, name) \
487 _DEFINE_TRIVIAL_REF_FUNC(type, name, _public_)
489 #define DEFINE_TRIVIAL_UNREF_FUNC(type, name, free_func) \
490 _DEFINE_TRIVIAL_UNREF_FUNC(type, name, free_func,)
491 #define DEFINE_PRIVATE_TRIVIAL_UNREF_FUNC(type, name, free_func) \
492 _DEFINE_TRIVIAL_UNREF_FUNC(type, name, free_func, static)
493 #define DEFINE_PUBLIC_TRIVIAL_UNREF_FUNC(type, name, free_func) \
494 _DEFINE_TRIVIAL_UNREF_FUNC(type, name, free_func, _public_)
496 #define DEFINE_TRIVIAL_REF_UNREF_FUNC(type, name, free_func) \
497 DEFINE_TRIVIAL_REF_FUNC(type, name); \
498 DEFINE_TRIVIAL_UNREF_FUNC(type, name, free_func);
500 #define DEFINE_PRIVATE_TRIVIAL_REF_UNREF_FUNC(type, name, free_func) \
501 DEFINE_PRIVATE_TRIVIAL_REF_FUNC(type, name); \
502 DEFINE_PRIVATE_TRIVIAL_UNREF_FUNC(type, name, free_func);
504 #define DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(type, name, free_func) \
505 DEFINE_PUBLIC_TRIVIAL_REF_FUNC(type, name); \
506 DEFINE_PUBLIC_TRIVIAL_UNREF_FUNC(type, name, free_func);