src/basic/macro.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 #pragma once
   3
   4 #include <assert.h>
   5 #include <errno.h>
   6 #include <inttypes.h>
   7 #include <stdbool.h>
   8 #include <sys/param.h>
   9 #include <sys/sysmacros.h>
  10 #include <sys/types.h>
  11
  12 #define _printf_(a, b) __attribute__((__format__(printf, a, b)))
  13 #ifdef __clang__
  14 #  define _alloc_(...)
  15 #else
  16 #  define _alloc_(...) __attribute__((__alloc_size__(__VA_ARGS__)))
  17 #endif
  18 #define _sentinel_ __attribute__((__sentinel__))
  19 #define _section_(x) __attribute__((__section__(x)))
  20 #define _used_ __attribute__((__used__))
  21 #define _unused_ __attribute__((__unused__))
  22 #define _destructor_ __attribute__((__destructor__))
  23 #define _pure_ __attribute__((__pure__))
  24 #define _const_ __attribute__((__const__))
  25 #define _deprecated_ __attribute__((__deprecated__))
  26 #define _packed_ __attribute__((__packed__))
  27 #define _malloc_ __attribute__((__malloc__))
  28 #define _weak_ __attribute__((__weak__))
  29 #define _likely_(x) (__builtin_expect(!!(x), 1))
  30 #define _unlikely_(x) (__builtin_expect(!!(x), 0))
  31 #define _public_ __attribute__((__visibility__("default")))
  32 #define _hidden_ __attribute__((__visibility__("hidden")))
  33 #define _weakref_(x) __attribute__((__weakref__(#x)))
  34 #define _align_(x) __attribute__((__aligned__(x)))
  35 #define _alignas_(x) __attribute__((__aligned__(__alignof(x))))
  36 #define _alignptr_ __attribute__((__aligned__(sizeof(void*))))
  37 #define _cleanup_(x) __attribute__((__cleanup__(x)))
  38 #if __GNUC__ >= 7
  39 #define _fallthrough_ __attribute__((__fallthrough__))
  40 #else
  41 #define _fallthrough_
  42 #endif
  43 /* Define C11 noreturn without <stdnoreturn.h> and even on older gcc
  44  * compiler versions */
  45 #ifndef _noreturn_
  46 #if __STDC_VERSION__ >= 201112L
  47 #define _noreturn_ _Noreturn
  48 #else
  49 #define _noreturn_ __attribute__((__noreturn__))
  50 #endif
  51 #endif
  52
  53 #if !defined(HAS_FEATURE_MEMORY_SANITIZER)
  54 #  if defined(__has_feature)
  55 #    if __has_feature(memory_sanitizer)
  56 #      define HAS_FEATURE_MEMORY_SANITIZER 1
  57 #    endif
  58 #  endif
  59 #  if !defined(HAS_FEATURE_MEMORY_SANITIZER)
  60 #    define HAS_FEATURE_MEMORY_SANITIZER 0
  61 #  endif
  62 #endif
  63
  64 #if !defined(HAS_FEATURE_ADDRESS_SANITIZER)
  65 #  ifdef __SANITIZE_ADDRESS__
  66 #      define HAS_FEATURE_ADDRESS_SANITIZER 1
  67 #  elif defined(__has_feature)
  68 #    if __has_feature(address_sanitizer)
  69 #      define HAS_FEATURE_ADDRESS_SANITIZER 1
  70 #    endif
  71 #  endif
  72 #  if !defined(HAS_FEATURE_ADDRESS_SANITIZER)
  73 #    define HAS_FEATURE_ADDRESS_SANITIZER 0
  74 #  endif
  75 #endif
  76
  77 /* Note: on GCC "no_sanitize_address" is a function attribute only, on llvm it may also be applied to global
  78  * variables. We define a specific macro which knows this. Note that on GCC we don't need this decorator so much, since
  79  * our primary usecase for this attribute is registration structures placed in named ELF sections which shall not be
  80  * padded, but GCC doesn't pad those anyway if AddressSanitizer is enabled. */
  81 #if HAS_FEATURE_ADDRESS_SANITIZER && defined(__clang__)
  82 #define _variable_no_sanitize_address_ __attribute__((__no_sanitize_address__))
  83 #else
  84 #define _variable_no_sanitize_address_
  85 #endif
  86
  87 /* Temporarily disable some warnings */
  88 #define DISABLE_WARNING_FORMAT_NONLITERAL                               \
  89         _Pragma("GCC diagnostic push");                                 \
  90         _Pragma("GCC diagnostic ignored \"-Wformat-nonliteral\"")
  91
  92 #define DISABLE_WARNING_MISSING_PROTOTYPES                              \
  93         _Pragma("GCC diagnostic push");                                 \
  94         _Pragma("GCC diagnostic ignored \"-Wmissing-prototypes\"")
  95
  96 #define DISABLE_WARNING_NONNULL                                         \
  97         _Pragma("GCC diagnostic push");                                 \
  98         _Pragma("GCC diagnostic ignored \"-Wnonnull\"")
  99
 100 #define DISABLE_WARNING_SHADOW                                          \
 101         _Pragma("GCC diagnostic push");                                 \
 102         _Pragma("GCC diagnostic ignored \"-Wshadow\"")
 103
 104 #define DISABLE_WARNING_INCOMPATIBLE_POINTER_TYPES                      \
 105         _Pragma("GCC diagnostic push");                                 \
 106         _Pragma("GCC diagnostic ignored \"-Wincompatible-pointer-types\"")
 107
 108 #if HAVE_WSTRINGOP_TRUNCATION
 109 #  define DISABLE_WARNING_STRINGOP_TRUNCATION                           \
 110         _Pragma("GCC diagnostic push");                                 \
 111         _Pragma("GCC diagnostic ignored \"-Wstringop-truncation\"")
 112 #else
 113 #  define DISABLE_WARNING_STRINGOP_TRUNCATION                           \
 114         _Pragma("GCC diagnostic push")
 115 #endif
 116
 117 #define REENABLE_WARNING                                                \
 118         _Pragma("GCC diagnostic pop")
 119
 120 /* automake test harness */
 121 #define EXIT_TEST_SKIP 77
 122
 123 #define XSTRINGIFY(x) #x
 124 #define STRINGIFY(x) XSTRINGIFY(x)
 125
 126 #define XCONCATENATE(x, y) x ## y
 127 #define CONCATENATE(x, y) XCONCATENATE(x, y)
 128
 129 #define UNIQ_T(x, uniq) CONCATENATE(__unique_prefix_, CONCATENATE(x, uniq))
 130 #define UNIQ __COUNTER__
 131
 132 /* builtins */
 133 #if __SIZEOF_INT__ == 4
 134 #define BUILTIN_FFS_U32(x) __builtin_ffs(x);
 135 #elif __SIZEOF_LONG__ == 4
 136 #define BUILTIN_FFS_U32(x) __builtin_ffsl(x);
 137 #else
 138 #error "neither int nor long are four bytes long?!?"
 139 #endif
 140
 141 /* Rounds up */
 142
 143 #define ALIGN4(l) (((l) + 3) & ~3)
 144 #define ALIGN8(l) (((l) + 7) & ~7)
 145
 146 #if __SIZEOF_POINTER__ == 8
 147 #define ALIGN(l) ALIGN8(l)
 148 #elif __SIZEOF_POINTER__ == 4
 149 #define ALIGN(l) ALIGN4(l)
 150 #else
 151 #error "Wut? Pointers are neither 4 nor 8 bytes long?"
 152 #endif
 153
 154 #define ALIGN_PTR(p) ((void*) ALIGN((unsigned long) (p)))
 155 #define ALIGN4_PTR(p) ((void*) ALIGN4((unsigned long) (p)))
 156 #define ALIGN8_PTR(p) ((void*) ALIGN8((unsigned long) (p)))
 157
 158 static inline size_t ALIGN_TO(size_t l, size_t ali) {
 159         return ((l + ali - 1) & ~(ali - 1));
 160 }
 161
 162 #define ALIGN_TO_PTR(p, ali) ((void*) ALIGN_TO((unsigned long) (p), (ali)))
 163
 164 /* align to next higher power-of-2 (except for: 0 => 0, overflow => 0) */
 165 static inline unsigned long ALIGN_POWER2(unsigned long u) {
 166         /* clz(0) is undefined */
 167         if (u == 1)
 168                 return 1;
 169
 170         /* left-shift overflow is undefined */
 171         if (__builtin_clzl(u - 1UL) < 1)
 172                 return 0;
 173
 174         return 1UL << (sizeof(u) * 8 - __builtin_clzl(u - 1UL));
 175 }
 176
 177 #ifndef __COVERITY__
 178 #  define VOID_0 ((void)0)
 179 #else
 180 #  define VOID_0 ((void*)0)
 181 #endif
 182
 183 #define ELEMENTSOF(x)                                                   \
 184         (__builtin_choose_expr(                                         \
 185                 !__builtin_types_compatible_p(typeof(x), typeof(&*(x))), \
 186                 sizeof(x)/sizeof((x)[0]),                               \
 187                 VOID_0))
 188
 189 /*
 190  * STRLEN - return the length of a string literal, minus the trailing NUL byte.
 191  *          Contrary to strlen(), this is a constant expression.
 192  * @x: a string literal.
 193  */
 194 #define STRLEN(x) (sizeof(""x"") - 1)
 195
 196 /*
 197  * container_of - cast a member of a structure out to the containing structure
 198  * @ptr: the pointer to the member.
 199  * @type: the type of the container struct this is embedded in.
 200  * @member: the name of the member within the struct.
 201  */
 202 #define container_of(ptr, type, member) __container_of(UNIQ, (ptr), type, member)
 203 #define __container_of(uniq, ptr, type, member)                         \
 204         ({                                                              \
 205                 const typeof( ((type*)0)->member ) *UNIQ_T(A, uniq) = (ptr); \
 206                 (type*)( (char *)UNIQ_T(A, uniq) - offsetof(type, member) ); \
 207         })
 208
 209 #undef MAX
 210 #define MAX(a, b) __MAX(UNIQ, (a), UNIQ, (b))
 211 #define __MAX(aq, a, bq, b)                             \
 212         ({                                              \
 213                 const typeof(a) UNIQ_T(A, aq) = (a);    \
 214                 const typeof(b) UNIQ_T(B, bq) = (b);    \
 215                 UNIQ_T(A, aq) > UNIQ_T(B, bq) ? UNIQ_T(A, aq) : UNIQ_T(B, bq); \
 216         })
 217
 218 /* evaluates to (void) if _A or _B are not constant or of different types */
 219 #define CONST_MAX(_A, _B) \
 220         (__builtin_choose_expr(                                         \
 221                 __builtin_constant_p(_A) &&                             \
 222                 __builtin_constant_p(_B) &&                             \
 223                 __builtin_types_compatible_p(typeof(_A), typeof(_B)),   \
 224                 ((_A) > (_B)) ? (_A) : (_B),                            \
 225                 VOID_0))
 226
 227 /* takes two types and returns the size of the larger one */
 228 #define MAXSIZE(A, B) (sizeof(union _packed_ { typeof(A) a; typeof(B) b; }))
 229
 230 #define MAX3(x, y, z)                                   \
 231         ({                                              \
 232                 const typeof(x) _c = MAX(x, y);         \
 233                 MAX(_c, z);                             \
 234         })
 235
 236 #undef MIN
 237 #define MIN(a, b) __MIN(UNIQ, (a), UNIQ, (b))
 238 #define __MIN(aq, a, bq, b)                             \
 239         ({                                              \
 240                 const typeof(a) UNIQ_T(A, aq) = (a);    \
 241                 const typeof(b) UNIQ_T(B, bq) = (b);    \
 242                 UNIQ_T(A, aq) < UNIQ_T(B, bq) ? UNIQ_T(A, aq) : UNIQ_T(B, bq); \
 243         })
 244
 245 #define MIN3(x, y, z)                                   \
 246         ({                                              \
 247                 const typeof(x) _c = MIN(x, y);         \
 248                 MIN(_c, z);                             \
 249         })
 250
 251 #define LESS_BY(a, b) __LESS_BY(UNIQ, (a), UNIQ, (b))
 252 #define __LESS_BY(aq, a, bq, b)                         \
 253         ({                                              \
 254                 const typeof(a) UNIQ_T(A, aq) = (a);    \
 255                 const typeof(b) UNIQ_T(B, bq) = (b);    \
 256                 UNIQ_T(A, aq) > UNIQ_T(B, bq) ? UNIQ_T(A, aq) - UNIQ_T(B, bq) : 0; \
 257         })
 258
 259 #define CMP(a, b) __CMP(UNIQ, (a), UNIQ, (b))
 260 #define __CMP(aq, a, bq, b)                             \
 261         ({                                              \
 262                 const typeof(a) UNIQ_T(A, aq) = (a);    \
 263                 const typeof(b) UNIQ_T(B, bq) = (b);    \
 264                 UNIQ_T(A, aq) < UNIQ_T(B, bq) ? -1 :    \
 265                 UNIQ_T(A, aq) > UNIQ_T(B, bq) ? 1 : 0;  \
 266         })
 267
 268 #undef CLAMP
 269 #define CLAMP(x, low, high) __CLAMP(UNIQ, (x), UNIQ, (low), UNIQ, (high))
 270 #define __CLAMP(xq, x, lowq, low, highq, high)                          \
 271         ({                                                              \
 272                 const typeof(x) UNIQ_T(X, xq) = (x);                    \
 273                 const typeof(low) UNIQ_T(LOW, lowq) = (low);            \
 274                 const typeof(high) UNIQ_T(HIGH, highq) = (high);        \
 275                         UNIQ_T(X, xq) > UNIQ_T(HIGH, highq) ?           \
 276                                 UNIQ_T(HIGH, highq) :                   \
 277                                 UNIQ_T(X, xq) < UNIQ_T(LOW, lowq) ?     \
 278                                         UNIQ_T(LOW, lowq) :             \
 279                                         UNIQ_T(X, xq);                  \
 280         })
 281
 282 /* [(x + y - 1) / y] suffers from an integer overflow, even though the
 283  * computation should be possible in the given type. Therefore, we use
 284  * [x / y + !!(x % y)]. Note that on "Real CPUs" a division returns both the
 285  * quotient and the remainder, so both should be equally fast. */
 286 #define DIV_ROUND_UP(x, y) __DIV_ROUND_UP(UNIQ, (x), UNIQ, (y))
 287 #define __DIV_ROUND_UP(xq, x, yq, y)                                    \
 288         ({                                                              \
 289                 const typeof(x) UNIQ_T(X, xq) = (x);                    \
 290                 const typeof(y) UNIQ_T(Y, yq) = (y);                    \
 291                 (UNIQ_T(X, xq) / UNIQ_T(Y, yq) + !!(UNIQ_T(X, xq) % UNIQ_T(Y, yq))); \
 292         })
 293
 294 #ifdef __COVERITY__
 295
 296 /* Use special definitions of assertion macros in order to prevent
 297  * false positives of ASSERT_SIDE_EFFECT on Coverity static analyzer
 298  * for uses of assert_se() and assert_return().
 299  *
 300  * These definitions make expression go through a (trivial) function
 301  * call to ensure they are not discarded. Also use ! or !! to ensure
 302  * the boolean expressions are seen as such.
 303  *
 304  * This technique has been described and recommended in:
 305  * https://community.synopsys.com/s/question/0D534000046Yuzb/suppressing-assertsideeffect-for-functions-that-allow-for-sideeffects
 306  */
 307
 308 extern void __coverity_panic__(void);
 309
 310 static inline void __coverity_check__(int condition) {
 311         if (!condition)
 312                 __coverity_panic__();
 313 }
 314
 315 static inline int __coverity_check_and_return__(int condition) {
 316         return condition;
 317 }
 318
 319 #define assert_message_se(expr, message) __coverity_check__(!!(expr))
 320
 321 #define assert_log(expr, message) __coverity_check_and_return__(!!(expr))
 322
 323 #else  /* ! __COVERITY__ */
 324
 325 #define assert_message_se(expr, message)                                \
 326         do {                                                            \
 327                 if (_unlikely_(!(expr)))                                \
 328                         log_assert_failed(message, PROJECT_FILE, __LINE__, __PRETTY_FUNCTION__); \
 329         } while (false)
 330
 331 #define assert_log(expr, message) ((_likely_(expr))                     \
 332         ? (true)                                                        \
 333         : (log_assert_failed_return(message, PROJECT_FILE, __LINE__, __PRETTY_FUNCTION__), false))
 334
 335 #endif  /* __COVERITY__ */
 336
 337 #define assert_se(expr) assert_message_se(expr, #expr)
 338
 339 /* We override the glibc assert() here. */
 340 #undef assert
 341 #ifdef NDEBUG
 342 #define assert(expr) do {} while (false)
 343 #else
 344 #define assert(expr) assert_message_se(expr, #expr)
 345 #endif
 346
 347 #define assert_not_reached(t)                                           \
 348         log_assert_failed_unreachable(t, PROJECT_FILE, __LINE__, __PRETTY_FUNCTION__)
 349
 350 #if defined(static_assert)
 351 #define assert_cc(expr)                                                 \
 352         static_assert(expr, #expr)
 353 #else
 354 #define assert_cc(expr)                                                 \
 355         struct CONCATENATE(_assert_struct_, __COUNTER__) {              \
 356                 char x[(expr) ? 0 : -1];                                \
 357         }
 358 #endif
 359
 360 #define assert_return(expr, r)                                          \
 361         do {                                                            \
 362                 if (!assert_log(expr, #expr))                           \
 363                         return (r);                                     \
 364         } while (false)
 365
 366 #define assert_return_errno(expr, r, err)                               \
 367         do {                                                            \
 368                 if (!assert_log(expr, #expr)) {                         \
 369                         errno = err;                                    \
 370                         return (r);                                     \
 371                 }                                                       \
 372         } while (false)
 373
 374 #define return_with_errno(r, err)                     \
 375         do {                                          \
 376                 errno = abs(err);                     \
 377                 return r;                             \
 378         } while (false)
 379
 380 #define PTR_TO_INT(p) ((int) ((intptr_t) (p)))
 381 #define INT_TO_PTR(u) ((void *) ((intptr_t) (u)))
 382 #define PTR_TO_UINT(p) ((unsigned) ((uintptr_t) (p)))
 383 #define UINT_TO_PTR(u) ((void *) ((uintptr_t) (u)))
 384
 385 #define PTR_TO_LONG(p) ((long) ((intptr_t) (p)))
 386 #define LONG_TO_PTR(u) ((void *) ((intptr_t) (u)))
 387 #define PTR_TO_ULONG(p) ((unsigned long) ((uintptr_t) (p)))
 388 #define ULONG_TO_PTR(u) ((void *) ((uintptr_t) (u)))
 389
 390 #define PTR_TO_INT32(p) ((int32_t) ((intptr_t) (p)))
 391 #define INT32_TO_PTR(u) ((void *) ((intptr_t) (u)))
 392 #define PTR_TO_UINT32(p) ((uint32_t) ((uintptr_t) (p)))
 393 #define UINT32_TO_PTR(u) ((void *) ((uintptr_t) (u)))
 394
 395 #define PTR_TO_INT64(p) ((int64_t) ((intptr_t) (p)))
 396 #define INT64_TO_PTR(u) ((void *) ((intptr_t) (u)))
 397 #define PTR_TO_UINT64(p) ((uint64_t) ((uintptr_t) (p)))
 398 #define UINT64_TO_PTR(u) ((void *) ((uintptr_t) (u)))
 399
 400 #define PTR_TO_SIZE(p) ((size_t) ((uintptr_t) (p)))
 401 #define SIZE_TO_PTR(u) ((void *) ((uintptr_t) (u)))
 402
 403 #define CHAR_TO_STR(x) ((char[2]) { x, 0 })
 404
 405 #define char_array_0(x) x[sizeof(x)-1] = 0;
 406
 407 /* Returns the number of chars needed to format variables of the
 408  * specified type as a decimal string. Adds in extra space for a
 409  * negative '-' prefix (hence works correctly on signed
 410  * types). Includes space for the trailing NUL. */
 411 #define DECIMAL_STR_MAX(type)                                           \
 412         (2+(sizeof(type) <= 1 ? 3 :                                     \
 413             sizeof(type) <= 2 ? 5 :                                     \
 414             sizeof(type) <= 4 ? 10 :                                    \
 415             sizeof(type) <= 8 ? 20 : sizeof(int[-2*(sizeof(type) > 8)])))
 416
 417 #define DECIMAL_STR_WIDTH(x)                            \
 418         ({                                              \
 419                 typeof(x) _x_ = (x);                    \
 420                 unsigned ans = 1;                       \
 421                 while ((_x_ /= 10) != 0)                \
 422                         ans++;                          \
 423                 ans;                                    \
 424         })
 425
 426 #define SET_FLAG(v, flag, b) \
 427         (v) = (b) ? ((v) | (flag)) : ((v) & ~(flag))
 428 #define FLAGS_SET(v, flags) \
 429         ((~(v) & (flags)) == 0)
 430
 431 #define CASE_F(X) case X:
 432 #define CASE_F_1(CASE, X) CASE_F(X)
 433 #define CASE_F_2(CASE, X, ...)  CASE(X) CASE_F_1(CASE, __VA_ARGS__)
 434 #define CASE_F_3(CASE, X, ...)  CASE(X) CASE_F_2(CASE, __VA_ARGS__)
 435 #define CASE_F_4(CASE, X, ...)  CASE(X) CASE_F_3(CASE, __VA_ARGS__)
 436 #define CASE_F_5(CASE, X, ...)  CASE(X) CASE_F_4(CASE, __VA_ARGS__)
 437 #define CASE_F_6(CASE, X, ...)  CASE(X) CASE_F_5(CASE, __VA_ARGS__)
 438 #define CASE_F_7(CASE, X, ...)  CASE(X) CASE_F_6(CASE, __VA_ARGS__)
 439 #define CASE_F_8(CASE, X, ...)  CASE(X) CASE_F_7(CASE, __VA_ARGS__)
 440 #define CASE_F_9(CASE, X, ...)  CASE(X) CASE_F_8(CASE, __VA_ARGS__)
 441 #define CASE_F_10(CASE, X, ...) CASE(X) CASE_F_9(CASE, __VA_ARGS__)
 442 #define CASE_F_11(CASE, X, ...) CASE(X) CASE_F_10(CASE, __VA_ARGS__)
 443 #define CASE_F_12(CASE, X, ...) CASE(X) CASE_F_11(CASE, __VA_ARGS__)
 444 #define CASE_F_13(CASE, X, ...) CASE(X) CASE_F_12(CASE, __VA_ARGS__)
 445 #define CASE_F_14(CASE, X, ...) CASE(X) CASE_F_13(CASE, __VA_ARGS__)
 446 #define CASE_F_15(CASE, X, ...) CASE(X) CASE_F_14(CASE, __VA_ARGS__)
 447 #define CASE_F_16(CASE, X, ...) CASE(X) CASE_F_15(CASE, __VA_ARGS__)
 448 #define CASE_F_17(CASE, X, ...) CASE(X) CASE_F_16(CASE, __VA_ARGS__)
 449 #define CASE_F_18(CASE, X, ...) CASE(X) CASE_F_17(CASE, __VA_ARGS__)
 450 #define CASE_F_19(CASE, X, ...) CASE(X) CASE_F_18(CASE, __VA_ARGS__)
 451 #define CASE_F_20(CASE, X, ...) CASE(X) CASE_F_19(CASE, __VA_ARGS__)
 452
 453 #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
 454 #define FOR_EACH_MAKE_CASE(...) \
 455         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, \
 456                                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) \
 457                    (CASE_F,__VA_ARGS__)
 458
 459 #define IN_SET(x, ...)                          \
 460         ({                                      \
 461                 bool _found = false;            \
 462                 /* If the build breaks in the line below, you need to extend the case macros. (We use "long double" as  \
 463                  * type for the array, in the hope that checkers such as ubsan don't complain that the initializers for \
 464                  * the array are not representable by the base type. Ideally we'd use typeof(x) as base type, but that  \
 465                  * doesn't work, as we want to use this on bitfields and gcc refuses typeof() on bitfields.) */         \
 466                 static const long double __assert_in_set[] _unused_ = { __VA_ARGS__ }; \
 467                 assert_cc(ELEMENTSOF(__assert_in_set) <= 20); \
 468                 switch(x) {                     \
 469                 FOR_EACH_MAKE_CASE(__VA_ARGS__) \
 470                         _found = true;          \
 471                         break;                  \
 472                 default:                        \
 473                         break;                  \
 474                 }                               \
 475                 _found;                         \
 476         })
 477
 478 #define SWAP_TWO(x, y) do {                        \
 479                 typeof(x) _t = (x);                \
 480                 (x) = (y);                         \
 481                 (y) = (_t);                        \
 482         } while (false)
 483
 484 /* Define C11 thread_local attribute even on older gcc compiler
 485  * version */
 486 #ifndef thread_local
 487 /*
 488  * Don't break on glibc < 2.16 that doesn't define __STDC_NO_THREADS__
 489  * see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53769
 490  */
 491 #if __STDC_VERSION__ >= 201112L && !(defined(__STDC_NO_THREADS__) || (defined(__GNU_LIBRARY__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 16))
 492 #define thread_local _Thread_local
 493 #else
 494 #define thread_local __thread
 495 #endif
 496 #endif
 497
 498 #define DEFINE_TRIVIAL_DESTRUCTOR(name, type, func)             \
 499         static inline void name(type *p) {                      \
 500                 func(p);                                        \
 501         }
 502
 503 #define DEFINE_TRIVIAL_CLEANUP_FUNC(type, func)                 \
 504         static inline void func##p(type *p) {                   \
 505                 if (*p)                                         \
 506                         func(*p);                               \
 507         }
 508
 509 #define _DEFINE_TRIVIAL_REF_FUNC(type, name, scope)             \
 510         scope type *name##_ref(type *p) {                       \
 511                 if (!p)                                         \
 512                         return NULL;                            \
 513                                                                 \
 514                 assert(p->n_ref > 0);                           \
 515                 p->n_ref++;                                     \
 516                 return p;                                       \
 517         }
 518
 519 #define _DEFINE_TRIVIAL_UNREF_FUNC(type, name, free_func, scope) \
 520         scope type *name##_unref(type *p) {                      \
 521                 if (!p)                                          \
 522                         return NULL;                             \
 523                                                                  \
 524                 assert(p->n_ref > 0);                            \
 525                 p->n_ref--;                                      \
 526                 if (p->n_ref > 0)                                \
 527                         return NULL;                             \
 528                                                                  \
 529                 return free_func(p);                             \
 530         }
 531
 532 #define DEFINE_TRIVIAL_REF_FUNC(type, name)     \
 533         _DEFINE_TRIVIAL_REF_FUNC(type, name,)
 534 #define DEFINE_PRIVATE_TRIVIAL_REF_FUNC(type, name)     \
 535         _DEFINE_TRIVIAL_REF_FUNC(type, name, static)
 536 #define DEFINE_PUBLIC_TRIVIAL_REF_FUNC(type, name)      \
 537         _DEFINE_TRIVIAL_REF_FUNC(type, name, _public_)
 538
 539 #define DEFINE_TRIVIAL_UNREF_FUNC(type, name, free_func)        \
 540         _DEFINE_TRIVIAL_UNREF_FUNC(type, name, free_func,)
 541 #define DEFINE_PRIVATE_TRIVIAL_UNREF_FUNC(type, name, free_func)        \
 542         _DEFINE_TRIVIAL_UNREF_FUNC(type, name, free_func, static)
 543 #define DEFINE_PUBLIC_TRIVIAL_UNREF_FUNC(type, name, free_func)         \
 544         _DEFINE_TRIVIAL_UNREF_FUNC(type, name, free_func, _public_)
 545
 546 #define DEFINE_TRIVIAL_REF_UNREF_FUNC(type, name, free_func)    \
 547         DEFINE_TRIVIAL_REF_FUNC(type, name);                    \
 548         DEFINE_TRIVIAL_UNREF_FUNC(type, name, free_func);
 549
 550 #define DEFINE_PRIVATE_TRIVIAL_REF_UNREF_FUNC(type, name, free_func)    \
 551         DEFINE_PRIVATE_TRIVIAL_REF_FUNC(type, name);                    \
 552         DEFINE_PRIVATE_TRIVIAL_UNREF_FUNC(type, name, free_func);
 553
 554 #define DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(type, name, free_func)    \
 555         DEFINE_PUBLIC_TRIVIAL_REF_FUNC(type, name);                    \
 556         DEFINE_PUBLIC_TRIVIAL_UNREF_FUNC(type, name, free_func);
 557
 558 #include "log.h"