1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Berkeley Software Design, Inc. 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, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)cdefs.h 8.8 (Berkeley) 1/9/95 35 */ 36 37 #ifndef _SYS_CDEFS_H_ 38 #define _SYS_CDEFS_H_ 39 40 #if defined(_KERNEL) && defined(_STANDALONE) 41 #error "_KERNEL and _STANDALONE are mutually exclusive" 42 #endif 43 44 /* 45 * Testing against Clang-specific extensions. 46 */ 47 #ifndef __has_attribute 48 #define __has_attribute(x) 0 49 #endif 50 #ifndef __has_extension 51 #define __has_extension __has_feature 52 #endif 53 #ifndef __has_feature 54 #define __has_feature(x) 0 55 #endif 56 #ifndef __has_include 57 #define __has_include(x) 0 58 #endif 59 #ifndef __has_builtin 60 #define __has_builtin(x) 0 61 #endif 62 63 #if defined(__cplusplus) 64 #define __BEGIN_DECLS extern "C" { 65 #define __END_DECLS } 66 #else 67 #define __BEGIN_DECLS 68 #define __END_DECLS 69 #endif 70 71 /* 72 * This code has been put in place to help reduce the addition of 73 * compiler specific defines in FreeBSD code. It helps to aid in 74 * having a compiler-agnostic source tree. 75 */ 76 77 #if defined(__GNUC__) 78 79 #if __GNUC__ >= 3 80 #define __GNUCLIKE_ASM 3 81 #define __GNUCLIKE_MATH_BUILTIN_CONSTANTS 82 #else 83 #define __GNUCLIKE_ASM 2 84 #endif 85 #define __GNUCLIKE___TYPEOF 1 86 #define __GNUCLIKE___OFFSETOF 1 87 #define __GNUCLIKE___SECTION 1 88 89 #define __GNUCLIKE_CTOR_SECTION_HANDLING 1 90 91 #define __GNUCLIKE_BUILTIN_CONSTANT_P 1 92 93 #if (__GNUC_MINOR__ > 95 || __GNUC__ >= 3) 94 #define __GNUCLIKE_BUILTIN_VARARGS 1 95 #define __GNUCLIKE_BUILTIN_STDARG 1 96 #define __GNUCLIKE_BUILTIN_VAALIST 1 97 #endif 98 99 #define __GNUC_VA_LIST_COMPATIBILITY 1 100 101 /* 102 * Compiler memory barriers, specific to gcc and clang. 103 */ 104 #define __compiler_membar() __asm __volatile(" " : : : "memory") 105 106 #define __GNUCLIKE_BUILTIN_NEXT_ARG 1 107 #define __GNUCLIKE_MATH_BUILTIN_RELOPS 108 109 #define __GNUCLIKE_BUILTIN_MEMCPY 1 110 111 /* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */ 112 #define __CC_SUPPORTS_INLINE 1 113 #define __CC_SUPPORTS___INLINE 1 114 #define __CC_SUPPORTS___INLINE__ 1 115 116 #define __CC_SUPPORTS___FUNC__ 1 117 #define __CC_SUPPORTS_WARNING 1 118 119 #define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */ 120 121 #define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1 122 123 #endif /* __GNUC__ */ 124 125 /* 126 * Macro to test if we're using a specific version of gcc or later. 127 */ 128 #if defined(__GNUC__) 129 #define __GNUC_PREREQ__(ma, mi) \ 130 (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi)) 131 #else 132 #define __GNUC_PREREQ__(ma, mi) 0 133 #endif 134 135 /* 136 * The __CONCAT macro is used to concatenate parts of symbol names, e.g. 137 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo. 138 * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI 139 * mode -- there must be no spaces between its arguments, and for nested 140 * __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also 141 * concatenate double-quoted strings produced by the __STRING macro, but 142 * this only works with ANSI C. 143 * 144 * __XSTRING is like __STRING, but it expands any macros in its argument 145 * first. It is only available with ANSI C. 146 */ 147 #if defined(__STDC__) || defined(__cplusplus) 148 #define __P(protos) protos /* full-blown ANSI C */ 149 #define __CONCAT1(x,y) x ## y 150 #define __CONCAT(x,y) __CONCAT1(x,y) 151 #define __STRING(x) #x /* stringify without expanding x */ 152 #define __XSTRING(x) __STRING(x) /* expand x, then stringify */ 153 154 #define __const const /* define reserved names to standard */ 155 #define __signed signed 156 #define __volatile volatile 157 #if defined(__cplusplus) 158 #define __inline inline /* convert to C++ keyword */ 159 #else 160 #if !(defined(__CC_SUPPORTS___INLINE)) 161 #define __inline /* delete GCC keyword */ 162 #endif /* ! __CC_SUPPORTS___INLINE */ 163 #endif /* !__cplusplus */ 164 165 #else /* !(__STDC__ || __cplusplus) */ 166 #define __P(protos) () /* traditional C preprocessor */ 167 #define __CONCAT(x,y) x/**/y 168 #define __STRING(x) "x" 169 170 #if !defined(__CC_SUPPORTS___INLINE) 171 #define __const /* delete pseudo-ANSI C keywords */ 172 #define __inline 173 #define __signed 174 #define __volatile 175 /* 176 * In non-ANSI C environments, new programs will want ANSI-only C keywords 177 * deleted from the program and old programs will want them left alone. 178 * When using a compiler other than gcc, programs using the ANSI C keywords 179 * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS. 180 * When using "gcc -traditional", we assume that this is the intent; if 181 * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone. 182 */ 183 #ifndef NO_ANSI_KEYWORDS 184 #define const /* delete ANSI C keywords */ 185 #define inline 186 #define signed 187 #define volatile 188 #endif /* !NO_ANSI_KEYWORDS */ 189 #endif /* !__CC_SUPPORTS___INLINE */ 190 #endif /* !(__STDC__ || __cplusplus) */ 191 192 /* 193 * Compiler-dependent macros to help declare dead (non-returning) and 194 * pure (no side effects) functions, and unused variables. They are 195 * null except for versions of gcc that are known to support the features 196 * properly (old versions of gcc-2 supported the dead and pure features 197 * in a different (wrong) way). If we do not provide an implementation 198 * for a given compiler, let the compile fail if it is told to use 199 * a feature that we cannot live without. 200 */ 201 #define __weak_symbol __attribute__((__weak__)) 202 #if !__GNUC_PREREQ__(2, 5) 203 #define __dead2 204 #define __pure2 205 #define __unused 206 #endif 207 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 208 #define __dead2 __attribute__((__noreturn__)) 209 #define __pure2 __attribute__((__const__)) 210 #define __unused 211 /* XXX Find out what to do for __packed, __aligned and __section */ 212 #endif 213 #if __GNUC_PREREQ__(2, 7) 214 #define __dead2 __attribute__((__noreturn__)) 215 #define __pure2 __attribute__((__const__)) 216 #define __unused __attribute__((__unused__)) 217 #define __used __attribute__((__used__)) 218 #define __packed __attribute__((__packed__)) 219 #define __aligned(x) __attribute__((__aligned__(x))) 220 #define __section(x) __attribute__((__section__(x))) 221 #endif 222 #if __GNUC_PREREQ__(4, 3) || __has_attribute(__alloc_size__) 223 #define __alloc_size(x) __attribute__((__alloc_size__(x))) 224 #define __alloc_size2(n, x) __attribute__((__alloc_size__(n, x))) 225 #else 226 #define __alloc_size(x) 227 #define __alloc_size2(n, x) 228 #endif 229 #if __GNUC_PREREQ__(4, 9) || __has_attribute(__alloc_align__) 230 #define __alloc_align(x) __attribute__((__alloc_align__(x))) 231 #else 232 #define __alloc_align(x) 233 #endif 234 235 #if !__GNUC_PREREQ__(2, 95) 236 #define __alignof(x) __offsetof(struct { char __a; x __b; }, __b) 237 #endif 238 239 /* 240 * Keywords added in C11. 241 */ 242 243 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L 244 245 #if !__has_extension(c_alignas) 246 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \ 247 __has_extension(cxx_alignas) 248 #define _Alignas(x) alignas(x) 249 #else 250 /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */ 251 #define _Alignas(x) __aligned(x) 252 #endif 253 #endif 254 255 #if defined(__cplusplus) && __cplusplus >= 201103L 256 #define _Alignof(x) alignof(x) 257 #else 258 #define _Alignof(x) __alignof(x) 259 #endif 260 261 #if !defined(__cplusplus) && !__has_extension(c_atomic) && \ 262 !__has_extension(cxx_atomic) && !__GNUC_PREREQ__(4, 7) 263 /* 264 * No native support for _Atomic(). Place object in structure to prevent 265 * most forms of direct non-atomic access. 266 */ 267 #define _Atomic(T) struct { T volatile __val; } 268 #endif 269 270 #if !__has_extension(c_static_assert) 271 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \ 272 __has_extension(cxx_static_assert) 273 #define _Static_assert(x, y) static_assert(x, y) 274 #elif __GNUC_PREREQ__(4,6) && !defined(__cplusplus) 275 /* Nothing, gcc 4.6 and higher has _Static_assert built-in */ 276 #elif defined(__COUNTER__) 277 #define _Static_assert(x, y) __Static_assert(x, __COUNTER__) 278 #define __Static_assert(x, y) ___Static_assert(x, y) 279 #define ___Static_assert(x, y) typedef char __assert_ ## y[(x) ? 1 : -1] \ 280 __unused 281 #else 282 #define _Static_assert(x, y) struct __hack 283 #endif 284 #endif 285 286 #if !__has_extension(c_thread_local) 287 /* 288 * XXX: Some compilers (Clang 3.3, GCC 4.7) falsely announce C++11 mode 289 * without actually supporting the thread_local keyword. Don't check for 290 * the presence of C++11 when defining _Thread_local. 291 */ 292 #if /* (defined(__cplusplus) && __cplusplus >= 201103L) || */ \ 293 __has_extension(cxx_thread_local) 294 #define _Thread_local thread_local 295 #else 296 #define _Thread_local __thread 297 #endif 298 #endif 299 300 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */ 301 302 /* 303 * Emulation of C11 _Generic(). Unlike the previously defined C11 304 * keywords, it is not possible to implement this using exactly the same 305 * syntax. Therefore implement something similar under the name 306 * __generic(). Unlike _Generic(), this macro can only distinguish 307 * between a single type, so it requires nested invocations to 308 * distinguish multiple cases. 309 * 310 * Note that the comma operator is used to force expr to decay in 311 * order to match _Generic(). 312 */ 313 314 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \ 315 __has_extension(c_generic_selections) 316 #define __generic(expr, t, yes, no) \ 317 _Generic(expr, t: yes, default: no) 318 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus) 319 #define __generic(expr, t, yes, no) \ 320 __builtin_choose_expr( \ 321 __builtin_types_compatible_p(__typeof((0, (expr))), t), yes, no) 322 #endif 323 324 /* 325 * C99 Static array indices in function parameter declarations. Syntax such as: 326 * void bar(int myArray[static 10]); 327 * is allowed in C99 but not in C++. Define __min_size appropriately so 328 * headers using it can be compiled in either language. Use like this: 329 * void bar(int myArray[__min_size(10)]); 330 */ 331 #if !defined(__cplusplus) && \ 332 (defined(__clang__) || __GNUC_PREREQ__(4, 6)) && \ 333 (!defined(__STDC_VERSION__) || (__STDC_VERSION__ >= 199901)) 334 #define __min_size(x) static (x) 335 #else 336 #define __min_size(x) (x) 337 #endif 338 339 #if __GNUC_PREREQ__(2, 96) 340 #define __malloc_like __attribute__((__malloc__)) 341 #define __pure __attribute__((__pure__)) 342 #else 343 #define __malloc_like 344 #define __pure 345 #endif 346 347 #if __GNUC_PREREQ__(3, 1) 348 #define __always_inline __attribute__((__always_inline__)) 349 #else 350 #define __always_inline 351 #endif 352 353 #if __GNUC_PREREQ__(3, 1) 354 #define __noinline __attribute__ ((__noinline__)) 355 #else 356 #define __noinline 357 #endif 358 359 #if __GNUC_PREREQ__(3, 4) 360 #define __fastcall __attribute__((__fastcall__)) 361 #define __result_use_check __attribute__((__warn_unused_result__)) 362 #else 363 #define __fastcall 364 #define __result_use_check 365 #endif 366 367 #if __GNUC_PREREQ__(4, 1) 368 #define __returns_twice __attribute__((__returns_twice__)) 369 #else 370 #define __returns_twice 371 #endif 372 373 #if __GNUC_PREREQ__(4, 6) || __has_builtin(__builtin_unreachable) 374 #define __unreachable() __builtin_unreachable() 375 #else 376 #define __unreachable() ((void)0) 377 #endif 378 379 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */ 380 #if !__GNUC_PREREQ__(2, 7) 381 #define __func__ NULL 382 #endif 383 384 #if (defined(__GNUC__) && __GNUC__ >= 2) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901 385 #define __LONG_LONG_SUPPORTED 386 #endif 387 388 /* C++11 exposes a load of C99 stuff */ 389 #if defined(__cplusplus) && __cplusplus >= 201103L 390 #define __LONG_LONG_SUPPORTED 391 #ifndef __STDC_LIMIT_MACROS 392 #define __STDC_LIMIT_MACROS 393 #endif 394 #ifndef __STDC_CONSTANT_MACROS 395 #define __STDC_CONSTANT_MACROS 396 #endif 397 #endif 398 399 /* 400 * We use `__restrict' as a way to define the `restrict' type qualifier 401 * without disturbing older software that is unaware of C99 keywords. 402 * GCC also provides `__restrict' as an extension to support C99-style 403 * restricted pointers in other language modes. 404 */ 405 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901 406 #define __restrict restrict 407 #elif !__GNUC_PREREQ__(2, 95) 408 #define __restrict 409 #endif 410 411 /* 412 * GNU C version 2.96 adds explicit branch prediction so that 413 * the CPU back-end can hint the processor and also so that 414 * code blocks can be reordered such that the predicted path 415 * sees a more linear flow, thus improving cache behavior, etc. 416 * 417 * The following two macros provide us with a way to utilize this 418 * compiler feature. Use __predict_true() if you expect the expression 419 * to evaluate to true, and __predict_false() if you expect the 420 * expression to evaluate to false. 421 * 422 * A few notes about usage: 423 * 424 * * Generally, __predict_false() error condition checks (unless 425 * you have some _strong_ reason to do otherwise, in which case 426 * document it), and/or __predict_true() `no-error' condition 427 * checks, assuming you want to optimize for the no-error case. 428 * 429 * * Other than that, if you don't know the likelihood of a test 430 * succeeding from empirical or other `hard' evidence, don't 431 * make predictions. 432 * 433 * * These are meant to be used in places that are run `a lot'. 434 * It is wasteful to make predictions in code that is run 435 * seldomly (e.g. at subsystem initialization time) as the 436 * basic block reordering that this affects can often generate 437 * larger code. 438 */ 439 #if __GNUC_PREREQ__(2, 96) 440 #define __predict_true(exp) __builtin_expect((exp), 1) 441 #define __predict_false(exp) __builtin_expect((exp), 0) 442 #else 443 #define __predict_true(exp) (exp) 444 #define __predict_false(exp) (exp) 445 #endif 446 447 #if __GNUC_PREREQ__(4, 0) 448 #define __null_sentinel __attribute__((__sentinel__)) 449 #define __exported __attribute__((__visibility__("default"))) 450 #define __hidden __attribute__((__visibility__("hidden"))) 451 #else 452 #define __null_sentinel 453 #define __exported 454 #define __hidden 455 #endif 456 457 /* 458 * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h> 459 * require it. 460 */ 461 #if __GNUC_PREREQ__(4, 1) 462 #define __offsetof(type, field) __builtin_offsetof(type, field) 463 #else 464 #ifndef __cplusplus 465 #define __offsetof(type, field) \ 466 ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field)) 467 #else 468 #define __offsetof(type, field) \ 469 (__offsetof__ (reinterpret_cast <__size_t> \ 470 (&reinterpret_cast <const volatile char &> \ 471 (static_cast<type *> (0)->field)))) 472 #endif 473 #endif 474 #define __rangeof(type, start, end) \ 475 (__offsetof(type, end) - __offsetof(type, start)) 476 477 /* 478 * Given the pointer x to the member m of the struct s, return 479 * a pointer to the containing structure. When using GCC, we first 480 * assign pointer x to a local variable, to check that its type is 481 * compatible with member m. 482 */ 483 #if __GNUC_PREREQ__(3, 1) 484 #define __containerof(x, s, m) ({ \ 485 const volatile __typeof(((s *)0)->m) *__x = (x); \ 486 __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\ 487 }) 488 #else 489 #define __containerof(x, s, m) \ 490 __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m)) 491 #endif 492 493 /* 494 * Compiler-dependent macros to declare that functions take printf-like 495 * or scanf-like arguments. They are null except for versions of gcc 496 * that are known to support the features properly (old versions of gcc-2 497 * didn't permit keeping the keywords out of the application namespace). 498 */ 499 #if !__GNUC_PREREQ__(2, 7) 500 #define __printflike(fmtarg, firstvararg) 501 #define __scanflike(fmtarg, firstvararg) 502 #define __format_arg(fmtarg) 503 #define __strfmonlike(fmtarg, firstvararg) 504 #define __strftimelike(fmtarg, firstvararg) 505 #else 506 #define __printflike(fmtarg, firstvararg) \ 507 __attribute__((__format__ (__printf__, fmtarg, firstvararg))) 508 #define __scanflike(fmtarg, firstvararg) \ 509 __attribute__((__format__ (__scanf__, fmtarg, firstvararg))) 510 #define __format_arg(fmtarg) __attribute__((__format_arg__ (fmtarg))) 511 #define __strfmonlike(fmtarg, firstvararg) \ 512 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg))) 513 #define __strftimelike(fmtarg, firstvararg) \ 514 __attribute__((__format__ (__strftime__, fmtarg, firstvararg))) 515 #endif 516 517 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */ 518 #if defined(__FreeBSD_cc_version) && __FreeBSD_cc_version >= 300001 && \ 519 defined(__GNUC__) 520 #define __printf0like(fmtarg, firstvararg) \ 521 __attribute__((__format__ (__printf0__, fmtarg, firstvararg))) 522 #else 523 #define __printf0like(fmtarg, firstvararg) 524 #endif 525 526 #if defined(__GNUC__) 527 #define __strong_reference(sym,aliassym) \ 528 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym))) 529 #ifdef __STDC__ 530 #define __weak_reference(sym,alias) \ 531 __asm__(".weak " #alias); \ 532 __asm__(".equ " #alias ", " #sym) 533 #define __warn_references(sym,msg) \ 534 __asm__(".section .gnu.warning." #sym); \ 535 __asm__(".asciz \"" msg "\""); \ 536 __asm__(".previous") 537 #define __sym_compat(sym,impl,verid) \ 538 __asm__(".symver " #impl ", " #sym "@" #verid) 539 #define __sym_default(sym,impl,verid) \ 540 __asm__(".symver " #impl ", " #sym "@@@" #verid) 541 #else 542 #define __weak_reference(sym,alias) \ 543 __asm__(".weak alias"); \ 544 __asm__(".equ alias, sym") 545 #define __warn_references(sym,msg) \ 546 __asm__(".section .gnu.warning.sym"); \ 547 __asm__(".asciz \"msg\""); \ 548 __asm__(".previous") 549 #define __sym_compat(sym,impl,verid) \ 550 __asm__(".symver impl, sym@verid") 551 #define __sym_default(impl,sym,verid) \ 552 __asm__(".symver impl, sym@@@verid") 553 #endif /* __STDC__ */ 554 #endif /* __GNUC__ */ 555 556 #define __GLOBL(sym) __asm__(".globl " __XSTRING(sym)) 557 #define __WEAK(sym) __asm__(".weak " __XSTRING(sym)) 558 559 #if defined(__GNUC__) 560 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"") 561 #else 562 /* 563 * The following definition might not work well if used in header files, 564 * but it should be better than nothing. If you want a "do nothing" 565 * version, then it should generate some harmless declaration, such as: 566 * #define __IDSTRING(name,string) struct __hack 567 */ 568 #define __IDSTRING(name,string) static const char name[] __unused = string 569 #endif 570 571 /* 572 * Embed the rcs id of a source file in the resulting library. Note that in 573 * more recent ELF binutils, we use .ident allowing the ID to be stripped. 574 * Usage: 575 */ 576 #ifndef __FBSDID 577 #if !defined(STRIP_FBSDID) 578 #define __FBSDID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s) 579 #else 580 #define __FBSDID(s) struct __hack 581 #endif 582 #endif 583 584 #ifndef __RCSID 585 #ifndef NO__RCSID 586 #define __RCSID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s) 587 #else 588 #define __RCSID(s) struct __hack 589 #endif 590 #endif 591 592 #ifndef __RCSID_SOURCE 593 #ifndef NO__RCSID_SOURCE 594 #define __RCSID_SOURCE(s) __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s) 595 #else 596 #define __RCSID_SOURCE(s) struct __hack 597 #endif 598 #endif 599 600 #ifndef __SCCSID 601 #ifndef NO__SCCSID 602 #define __SCCSID(s) __IDSTRING(__CONCAT(__sccsid_,__LINE__),s) 603 #else 604 #define __SCCSID(s) struct __hack 605 #endif 606 #endif 607 608 #ifndef __COPYRIGHT 609 #ifndef NO__COPYRIGHT 610 #define __COPYRIGHT(s) __IDSTRING(__CONCAT(__copyright_,__LINE__),s) 611 #else 612 #define __COPYRIGHT(s) struct __hack 613 #endif 614 #endif 615 616 #ifndef __DECONST 617 #define __DECONST(type, var) ((type)(uintptr_t)(const void *)(var)) 618 #endif 619 620 #ifndef __DEVOLATILE 621 #define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var)) 622 #endif 623 624 #ifndef __DEQUALIFY 625 #define __DEQUALIFY(type, var) ((type)(uintptr_t)(const volatile void *)(var)) 626 #endif 627 628 /*- 629 * The following definitions are an extension of the behavior originally 630 * implemented in <sys/_posix.h>, but with a different level of granularity. 631 * POSIX.1 requires that the macros we test be defined before any standard 632 * header file is included. 633 * 634 * Here's a quick run-down of the versions: 635 * defined(_POSIX_SOURCE) 1003.1-1988 636 * _POSIX_C_SOURCE == 1 1003.1-1990 637 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option 638 * _POSIX_C_SOURCE == 199309 1003.1b-1993 639 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995, 640 * and the omnibus ISO/IEC 9945-1: 1996 641 * _POSIX_C_SOURCE == 200112 1003.1-2001 642 * _POSIX_C_SOURCE == 200809 1003.1-2008 643 * 644 * In addition, the X/Open Portability Guide, which is now the Single UNIX 645 * Specification, defines a feature-test macro which indicates the version of 646 * that specification, and which subsumes _POSIX_C_SOURCE. 647 * 648 * Our macros begin with two underscores to avoid namespace screwage. 649 */ 650 651 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */ 652 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1 653 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */ 654 #define _POSIX_C_SOURCE 199009 655 #endif 656 657 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */ 658 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2 659 #undef _POSIX_C_SOURCE 660 #define _POSIX_C_SOURCE 199209 661 #endif 662 663 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */ 664 #ifdef _XOPEN_SOURCE 665 #if _XOPEN_SOURCE - 0 >= 700 666 #define __XSI_VISIBLE 700 667 #undef _POSIX_C_SOURCE 668 #define _POSIX_C_SOURCE 200809 669 #elif _XOPEN_SOURCE - 0 >= 600 670 #define __XSI_VISIBLE 600 671 #undef _POSIX_C_SOURCE 672 #define _POSIX_C_SOURCE 200112 673 #elif _XOPEN_SOURCE - 0 >= 500 674 #define __XSI_VISIBLE 500 675 #undef _POSIX_C_SOURCE 676 #define _POSIX_C_SOURCE 199506 677 #endif 678 #endif 679 680 /* 681 * Deal with all versions of POSIX. The ordering relative to the tests above is 682 * important. 683 */ 684 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE) 685 #define _POSIX_C_SOURCE 198808 686 #endif 687 #ifdef _POSIX_C_SOURCE 688 #if _POSIX_C_SOURCE >= 200809 689 #define __POSIX_VISIBLE 200809 690 #define __ISO_C_VISIBLE 1999 691 #elif _POSIX_C_SOURCE >= 200112 692 #define __POSIX_VISIBLE 200112 693 #define __ISO_C_VISIBLE 1999 694 #elif _POSIX_C_SOURCE >= 199506 695 #define __POSIX_VISIBLE 199506 696 #define __ISO_C_VISIBLE 1990 697 #elif _POSIX_C_SOURCE >= 199309 698 #define __POSIX_VISIBLE 199309 699 #define __ISO_C_VISIBLE 1990 700 #elif _POSIX_C_SOURCE >= 199209 701 #define __POSIX_VISIBLE 199209 702 #define __ISO_C_VISIBLE 1990 703 #elif _POSIX_C_SOURCE >= 199009 704 #define __POSIX_VISIBLE 199009 705 #define __ISO_C_VISIBLE 1990 706 #else 707 #define __POSIX_VISIBLE 198808 708 #define __ISO_C_VISIBLE 0 709 #endif /* _POSIX_C_SOURCE */ 710 /* 711 * Both glibc and OpenBSD enable c11 features when _ISOC11_SOURCE is defined, or 712 * when compiling with -stdc=c11. A strict reading of the standard would suggest 713 * doing it only for the former. However, a strict reading also requires C99 714 * mode only, so building with C11 is already undefined. Follow glibc's and 715 * OpenBSD's lead for this non-standard configuration for maximum compatibility. 716 */ 717 #if _ISOC11_SOURCE || (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) 718 #undef __ISO_C_VISIBLE 719 #define __ISO_C_VISIBLE 2011 720 #endif 721 #else 722 /*- 723 * Deal with _ANSI_SOURCE: 724 * If it is defined, and no other compilation environment is explicitly 725 * requested, then define our internal feature-test macros to zero. This 726 * makes no difference to the preprocessor (undefined symbols in preprocessing 727 * expressions are defined to have value zero), but makes it more convenient for 728 * a test program to print out the values. 729 * 730 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as 731 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation 732 * environment (and in fact we will never get here). 733 */ 734 #if defined(_ANSI_SOURCE) /* Hide almost everything. */ 735 #define __POSIX_VISIBLE 0 736 #define __XSI_VISIBLE 0 737 #define __BSD_VISIBLE 0 738 #define __ISO_C_VISIBLE 1990 739 #define __EXT1_VISIBLE 0 740 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */ 741 #define __POSIX_VISIBLE 0 742 #define __XSI_VISIBLE 0 743 #define __BSD_VISIBLE 0 744 #define __ISO_C_VISIBLE 1999 745 #define __EXT1_VISIBLE 0 746 #elif defined(_C11_SOURCE) /* Localism to specify strict C11 env. */ 747 #define __POSIX_VISIBLE 0 748 #define __XSI_VISIBLE 0 749 #define __BSD_VISIBLE 0 750 #define __ISO_C_VISIBLE 2011 751 #define __EXT1_VISIBLE 0 752 #else /* Default environment: show everything. */ 753 #define __POSIX_VISIBLE 200809 754 #define __XSI_VISIBLE 700 755 #define __BSD_VISIBLE 1 756 #define __ISO_C_VISIBLE 2011 757 #define __EXT1_VISIBLE 1 758 #endif 759 #endif 760 761 /* User override __EXT1_VISIBLE */ 762 #if defined(__STDC_WANT_LIB_EXT1__) 763 #undef __EXT1_VISIBLE 764 #if __STDC_WANT_LIB_EXT1__ 765 #define __EXT1_VISIBLE 1 766 #else 767 #define __EXT1_VISIBLE 0 768 #endif 769 #endif /* __STDC_WANT_LIB_EXT1__ */ 770 771 /* 772 * Old versions of GCC use non-standard ARM arch symbols; acle-compat.h 773 * translates them to __ARM_ARCH and the modern feature symbols defined by ARM. 774 */ 775 #if defined(__arm__) && !defined(__ARM_ARCH) 776 #include <machine/acle-compat.h> 777 #endif 778 779 /* 780 * Nullability qualifiers: currently only supported by Clang. 781 */ 782 #if !(defined(__clang__) && __has_feature(nullability)) 783 #define _Nonnull 784 #define _Nullable 785 #define _Null_unspecified 786 #define __NULLABILITY_PRAGMA_PUSH 787 #define __NULLABILITY_PRAGMA_POP 788 #else 789 #define __NULLABILITY_PRAGMA_PUSH _Pragma("clang diagnostic push") \ 790 _Pragma("clang diagnostic ignored \"-Wnullability-completeness\"") 791 #define __NULLABILITY_PRAGMA_POP _Pragma("clang diagnostic pop") 792 #endif 793 794 /* 795 * Type Safety Checking 796 * 797 * Clang provides additional attributes to enable checking type safety 798 * properties that cannot be enforced by the C type system. 799 */ 800 801 #if __has_attribute(__argument_with_type_tag__) && \ 802 __has_attribute(__type_tag_for_datatype__) 803 #define __arg_type_tag(arg_kind, arg_idx, type_tag_idx) \ 804 __attribute__((__argument_with_type_tag__(arg_kind, arg_idx, type_tag_idx))) 805 #define __datatype_type_tag(kind, type) \ 806 __attribute__((__type_tag_for_datatype__(kind, type))) 807 #else 808 #define __arg_type_tag(arg_kind, arg_idx, type_tag_idx) 809 #define __datatype_type_tag(kind, type) 810 #endif 811 812 /* 813 * Lock annotations. 814 * 815 * Clang provides support for doing basic thread-safety tests at 816 * compile-time, by marking which locks will/should be held when 817 * entering/leaving a functions. 818 * 819 * Furthermore, it is also possible to annotate variables and structure 820 * members to enforce that they are only accessed when certain locks are 821 * held. 822 */ 823 824 #if __has_extension(c_thread_safety_attributes) 825 #define __lock_annotate(x) __attribute__((x)) 826 #else 827 #define __lock_annotate(x) 828 #endif 829 830 /* Structure implements a lock. */ 831 #define __lockable __lock_annotate(lockable) 832 833 /* Function acquires an exclusive or shared lock. */ 834 #define __locks_exclusive(...) \ 835 __lock_annotate(exclusive_lock_function(__VA_ARGS__)) 836 #define __locks_shared(...) \ 837 __lock_annotate(shared_lock_function(__VA_ARGS__)) 838 839 /* Function attempts to acquire an exclusive or shared lock. */ 840 #define __trylocks_exclusive(...) \ 841 __lock_annotate(exclusive_trylock_function(__VA_ARGS__)) 842 #define __trylocks_shared(...) \ 843 __lock_annotate(shared_trylock_function(__VA_ARGS__)) 844 845 /* Function releases a lock. */ 846 #define __unlocks(...) __lock_annotate(unlock_function(__VA_ARGS__)) 847 848 /* Function asserts that an exclusive or shared lock is held. */ 849 #define __asserts_exclusive(...) \ 850 __lock_annotate(assert_exclusive_lock(__VA_ARGS__)) 851 #define __asserts_shared(...) \ 852 __lock_annotate(assert_shared_lock(__VA_ARGS__)) 853 854 /* Function requires that an exclusive or shared lock is or is not held. */ 855 #define __requires_exclusive(...) \ 856 __lock_annotate(exclusive_locks_required(__VA_ARGS__)) 857 #define __requires_shared(...) \ 858 __lock_annotate(shared_locks_required(__VA_ARGS__)) 859 #define __requires_unlocked(...) \ 860 __lock_annotate(locks_excluded(__VA_ARGS__)) 861 862 /* Function should not be analyzed. */ 863 #define __no_lock_analysis __lock_annotate(no_thread_safety_analysis) 864 865 /* 866 * Function or variable should not be sanitized, e.g., by AddressSanitizer. 867 * GCC has the nosanitize attribute, but as a function attribute only, and 868 * warns on use as a variable attribute. 869 */ 870 #if __has_attribute(no_sanitize) && defined(__clang__) 871 #ifdef _KERNEL 872 #define __nosanitizeaddress __attribute__((no_sanitize("kernel-address"))) 873 #define __nosanitizememory __attribute__((no_sanitize("kernel-memory"))) 874 #else 875 #define __nosanitizeaddress __attribute__((no_sanitize("address"))) 876 #define __nosanitizememory __attribute__((no_sanitize("memory"))) 877 #endif 878 #define __nosanitizethread __attribute__((no_sanitize("thread"))) 879 #else 880 #define __nosanitizeaddress 881 #define __nosanitizememory 882 #define __nosanitizethread 883 #endif 884 885 /* Guard variables and structure members by lock. */ 886 #define __guarded_by(x) __lock_annotate(guarded_by(x)) 887 #define __pt_guarded_by(x) __lock_annotate(pt_guarded_by(x)) 888 889 /* Alignment builtins for better type checking and improved code generation. */ 890 /* Provide fallback versions for other compilers (GCC/Clang < 10): */ 891 #if !__has_builtin(__builtin_is_aligned) 892 #define __builtin_is_aligned(x, align) \ 893 (((__uintptr_t)x & ((align) - 1)) == 0) 894 #endif 895 #if !__has_builtin(__builtin_align_up) 896 #define __builtin_align_up(x, align) \ 897 ((__typeof__(x))(((__uintptr_t)(x)+((align)-1))&(~((align)-1)))) 898 #endif 899 #if !__has_builtin(__builtin_align_down) 900 #define __builtin_align_down(x, align) \ 901 ((__typeof__(x))((x)&(~((align)-1)))) 902 #endif 903 904 #define __align_up(x, y) __builtin_align_up(x, y) 905 #define __align_down(x, y) __builtin_align_down(x, y) 906 #define __is_aligned(x, y) __builtin_is_aligned(x, y) 907 908 #ifdef LOSCFG_LIBC_NEWLIB 909 #undef _SYS_CDEFS_H_ 910 #include_next <sys/cdefs.h> 911 #endif 912 913 #endif /* !_SYS_CDEFS_H_ */ 914