1/*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Berkeley Software Design, Inc. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)cdefs.h 8.8 (Berkeley) 1/9/95 33 * $FreeBSD: releng/11.0/sys/sys/cdefs.h 300967 2016-05-29 17:32:19Z dim $ 34 */ 35 36#ifndef _SYS_CDEFS_H_ 37#define _SYS_CDEFS_H_ 38 39/* 40 * Testing against Clang-specific extensions. 41 */ 42#ifndef __has_attribute 43#define __has_attribute(x) 0 44#endif 45#ifndef __has_extension 46#define __has_extension __has_feature 47#endif 48#ifndef __has_feature 49#define __has_feature(x) 0 50#endif 51#ifndef __has_include 52#define __has_include(x) 0 53#endif 54#ifndef __has_builtin 55#define __has_builtin(x) 0 56#endif 57 58#if defined(__cplusplus) 59#define __BEGIN_DECLS extern "C" { 60#define __END_DECLS } 61#else 62#define __BEGIN_DECLS 63#define __END_DECLS 64#endif 65 66/* 67 * This code has been put in place to help reduce the addition of 68 * compiler specific defines in FreeBSD code. It helps to aid in 69 * having a compiler-agnostic source tree. 70 */ 71 72#if defined(__GNUC__) || defined(__INTEL_COMPILER) 73 74#if __GNUC__ >= 3 || defined(__INTEL_COMPILER) 75#define __GNUCLIKE_ASM 3 76#define __GNUCLIKE_MATH_BUILTIN_CONSTANTS 77#else 78#define __GNUCLIKE_ASM 2 79#endif 80#define __GNUCLIKE___TYPEOF 1 81#define __GNUCLIKE___OFFSETOF 1 82#define __GNUCLIKE___SECTION 1 83 84#ifndef __INTEL_COMPILER 85#define __GNUCLIKE_CTOR_SECTION_HANDLING 1 86#endif 87 88#define __GNUCLIKE_BUILTIN_CONSTANT_P 1 89#if defined(__INTEL_COMPILER) && defined(__cplusplus) && \ 90 __INTEL_COMPILER < 800 91#undef __GNUCLIKE_BUILTIN_CONSTANT_P 92#endif 93 94#if (__GNUC_MINOR__ > 95 || __GNUC__ >= 3) 95#define __GNUCLIKE_BUILTIN_VARARGS 1 96#define __GNUCLIKE_BUILTIN_STDARG 1 97#define __GNUCLIKE_BUILTIN_VAALIST 1 98#endif 99 100#if defined(__GNUC__) 101#define __GNUC_VA_LIST_COMPATIBILITY 1 102#endif 103 104/* 105 * Compiler memory barriers, specific to gcc and clang. 106 */ 107#if defined(__GNUC__) 108#define __compiler_membar() __asm __volatile(" " : : : "memory") 109#endif 110 111#ifndef __INTEL_COMPILER 112#define __GNUCLIKE_BUILTIN_NEXT_ARG 1 113#define __GNUCLIKE_MATH_BUILTIN_RELOPS 114#endif 115 116#define __GNUCLIKE_BUILTIN_MEMCPY 1 117 118/* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */ 119#define __CC_SUPPORTS_INLINE 1 120#define __CC_SUPPORTS___INLINE 1 121#define __CC_SUPPORTS___INLINE__ 1 122 123#define __CC_SUPPORTS___FUNC__ 1 124#define __CC_SUPPORTS_WARNING 1 125 126#define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */ 127 128#define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1 129 130#endif /* __GNUC__ || __INTEL_COMPILER */ 131 132/* 133 * Macro to test if we're using a specific version of gcc or later. 134 */ 135#if defined(__GNUC__) && !defined(__INTEL_COMPILER) 136#define __GNUC_PREREQ__(ma, mi) \ 137 (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi)) 138#else 139#define __GNUC_PREREQ__(ma, mi) 0 140#endif 141 142/* 143 * The __CONCAT macro is used to concatenate parts of symbol names, e.g. 144 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo. 145 * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI 146 * mode -- there must be no spaces between its arguments, and for nested 147 * __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also 148 * concatenate double-quoted strings produced by the __STRING macro, but 149 * this only works with ANSI C. 150 * 151 * __XSTRING is like __STRING, but it expands any macros in its argument 152 * first. It is only available with ANSI C. 153 */ 154#if defined(__STDC__) || defined(__cplusplus) 155#define __P(protos) protos /* full-blown ANSI C */ 156#define __CONCAT1(x,y) x ## y 157#define __CONCAT(x,y) __CONCAT1(x,y) 158#define __STRING(x) #x /* stringify without expanding x */ 159#define __XSTRING(x) __STRING(x) /* expand x, then stringify */ 160 161#define __const const /* define reserved names to standard */ 162#define __signed signed 163#define __volatile volatile 164#if defined(__cplusplus) 165#define __inline inline /* convert to C++ keyword */ 166#else 167#if !(defined(__CC_SUPPORTS___INLINE)) 168#define __inline /* delete GCC keyword */ 169#endif /* ! __CC_SUPPORTS___INLINE */ 170#endif /* !__cplusplus */ 171 172#else /* !(__STDC__ || __cplusplus) */ 173#define __P(protos) () /* traditional C preprocessor */ 174#define __CONCAT(x,y) x/**/y 175#define __STRING(x) "x" 176 177#if !defined(__CC_SUPPORTS___INLINE) 178#define __const /* delete pseudo-ANSI C keywords */ 179#define __inline 180#define __signed 181#define __volatile 182/* 183 * In non-ANSI C environments, new programs will want ANSI-only C keywords 184 * deleted from the program and old programs will want them left alone. 185 * When using a compiler other than gcc, programs using the ANSI C keywords 186 * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS. 187 * When using "gcc -traditional", we assume that this is the intent; if 188 * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone. 189 */ 190#ifndef NO_ANSI_KEYWORDS 191#define const /* delete ANSI C keywords */ 192#define inline 193#define signed 194#define volatile 195#endif /* !NO_ANSI_KEYWORDS */ 196#endif /* !__CC_SUPPORTS___INLINE */ 197#endif /* !(__STDC__ || __cplusplus) */ 198 199/* 200 * Compiler-dependent macros to help declare dead (non-returning) and 201 * pure (no side effects) functions, and unused variables. They are 202 * null except for versions of gcc that are known to support the features 203 * properly (old versions of gcc-2 supported the dead and pure features 204 * in a different (wrong) way). If we do not provide an implementation 205 * for a given compiler, let the compile fail if it is told to use 206 * a feature that we cannot live without. 207 */ 208#ifdef lint 209#define __dead2 210#define __pure2 211#define __unused 212#define __packed 213#define __aligned(x) 214#define __alloc_align(x) 215#define __alloc_size(x) 216#define __section(x) 217#define __weak_symbol 218#else 219#define __weak_symbol __attribute__((__weak__)) 220#if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER) 221#define __dead2 222#define __pure2 223#define __unused 224#endif 225#if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER) 226#define __dead2 __attribute__((__noreturn__)) 227#define __pure2 __attribute__((__const__)) 228#define __unused 229/* XXX Find out what to do for __packed, __aligned and __section */ 230#endif 231#if __GNUC_PREREQ__(2, 7) || defined(__INTEL_COMPILER) 232#define __dead2 __attribute__((__noreturn__)) 233#define __pure2 __attribute__((__const__)) 234#define __unused __attribute__((__unused__)) 235#define __used __attribute__((__used__)) 236#define __packed __attribute__((__packed__)) 237#define __aligned(x) __attribute__((__aligned__(x))) 238#define __section(x) __attribute__((__section__(x))) 239#endif 240#if __GNUC_PREREQ__(4, 3) || __has_attribute(__alloc_size__) 241#define __alloc_size(x) __attribute__((__alloc_size__(x))) 242#else 243#define __alloc_size(x) 244#endif 245#if __GNUC_PREREQ__(4, 9) || __has_attribute(__alloc_align__) 246#define __alloc_align(x) __attribute__((__alloc_align__(x))) 247#else 248#define __alloc_align(x) 249#endif 250#endif /* lint */ 251 252#if !__GNUC_PREREQ__(2, 95) 253#define __alignof(x) __offsetof(struct { char __a; x __b; }, __b) 254#endif 255 256/* 257 * Keywords added in C11. 258 */ 259 260#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L || defined(lint) 261 262#if !__has_extension(c_alignas) 263#if (defined(__cplusplus) && __cplusplus >= 201103L) || \ 264 __has_extension(cxx_alignas) 265#define _Alignas(x) alignas(x) 266#else 267/* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */ 268#define _Alignas(x) __aligned(x) 269#endif 270#endif 271 272#if defined(__cplusplus) && __cplusplus >= 201103L 273#define _Alignof(x) alignof(x) 274#else 275#define _Alignof(x) __alignof(x) 276#endif 277 278#if !defined(__cplusplus) && !__has_extension(c_atomic) && \ 279 !__has_extension(cxx_atomic) 280/* 281 * No native support for _Atomic(). Place object in structure to prevent 282 * most forms of direct non-atomic access. 283 */ 284#define _Atomic(T) struct { T volatile __val; } 285#endif 286 287#if defined(__cplusplus) && __cplusplus >= 201103L 288#define _Noreturn [[noreturn]] 289#else 290#define _Noreturn __dead2 291#endif 292 293#if !__has_extension(c_static_assert) 294#if (defined(__cplusplus) && __cplusplus >= 201103L) || \ 295 __has_extension(cxx_static_assert) 296#define _Static_assert(x, y) static_assert(x, y) 297#elif __GNUC_PREREQ__(4,6) 298/* Nothing, gcc 4.6 and higher has _Static_assert built-in */ 299#elif defined(__COUNTER__) 300#define _Static_assert(x, y) __Static_assert(x, __COUNTER__) 301#define __Static_assert(x, y) ___Static_assert(x, y) 302#define ___Static_assert(x, y) typedef char __assert_ ## y[(x) ? 1 : -1] \ 303 __unused 304#else 305#define _Static_assert(x, y) struct __hack 306#endif 307#endif 308 309#if !__has_extension(c_thread_local) 310/* 311 * XXX: Some compilers (Clang 3.3, GCC 4.7) falsely announce C++11 mode 312 * without actually supporting the thread_local keyword. Don't check for 313 * the presence of C++11 when defining _Thread_local. 314 */ 315#if /* (defined(__cplusplus) && __cplusplus >= 201103L) || */ \ 316 __has_extension(cxx_thread_local) 317#define _Thread_local thread_local 318#else 319#define _Thread_local __thread 320#endif 321#endif 322 323#endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */ 324 325/* 326 * Emulation of C11 _Generic(). Unlike the previously defined C11 327 * keywords, it is not possible to implement this using exactly the same 328 * syntax. Therefore implement something similar under the name 329 * __generic(). Unlike _Generic(), this macro can only distinguish 330 * between a single type, so it requires nested invocations to 331 * distinguish multiple cases. 332 */ 333 334#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \ 335 __has_extension(c_generic_selections) 336#define __generic(expr, t, yes, no) \ 337 _Generic(expr, t: yes, default: no) 338#elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus) 339#define __generic(expr, t, yes, no) \ 340 __builtin_choose_expr( \ 341 __builtin_types_compatible_p(__typeof(expr), t), yes, no) 342#endif 343 344#if __GNUC_PREREQ__(2, 96) 345#define __malloc_like __attribute__((__malloc__)) 346#define __pure __attribute__((__pure__)) 347#else 348#define __malloc_like 349#define __pure 350#endif 351 352#if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800) 353#define __always_inline __attribute__((__always_inline__)) 354#else 355#define __always_inline 356#endif 357 358#if __GNUC_PREREQ__(3, 1) 359#define __noinline __attribute__ ((__noinline__)) 360#else 361#define __noinline 362#endif 363 364#if __GNUC_PREREQ__(3, 3) 365#define __nonnull(x) __attribute__((__nonnull__(x))) 366#define __nonnull_all __attribute__((__nonnull__)) 367#else 368#define __nonnull(x) 369#define __nonnull_all 370#endif 371 372#if __GNUC_PREREQ__(3, 4) 373#define __fastcall __attribute__((__fastcall__)) 374#define __result_use_check __attribute__((__warn_unused_result__)) 375#else 376#define __fastcall 377#define __result_use_check 378#endif 379 380#if __GNUC_PREREQ__(4, 1) 381#define __returns_twice __attribute__((__returns_twice__)) 382#else 383#define __returns_twice 384#endif 385 386#if __GNUC_PREREQ__(4, 6) || __has_builtin(__builtin_unreachable) 387#define __unreachable() __builtin_unreachable() 388#else 389#define __unreachable() ((void)0) 390#endif 391 392/* XXX: should use `#if __STDC_VERSION__ < 199901'. */ 393#if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER) 394#define __func__ NULL 395#endif 396 397#if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901 398#define __LONG_LONG_SUPPORTED 399#endif 400 401/* C++11 exposes a load of C99 stuff */ 402#if defined(__cplusplus) && __cplusplus >= 201103L 403#define __LONG_LONG_SUPPORTED 404#ifndef __STDC_LIMIT_MACROS 405#define __STDC_LIMIT_MACROS 406#endif 407#ifndef __STDC_CONSTANT_MACROS 408#define __STDC_CONSTANT_MACROS 409#endif 410#endif 411 412/* 413 * GCC 2.95 provides `__restrict' as an extension to C90 to support the 414 * C99-specific `restrict' type qualifier. We happen to use `__restrict' as 415 * a way to define the `restrict' type qualifier without disturbing older 416 * software that is unaware of C99 keywords. 417 */ 418#if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95) 419#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint) 420#define __restrict 421#else 422#define __restrict restrict 423#endif 424#endif 425 426/* 427 * GNU C version 2.96 adds explicit branch prediction so that 428 * the CPU back-end can hint the processor and also so that 429 * code blocks can be reordered such that the predicted path 430 * sees a more linear flow, thus improving cache behavior, etc. 431 * 432 * The following two macros provide us with a way to utilize this 433 * compiler feature. Use __predict_true() if you expect the expression 434 * to evaluate to true, and __predict_false() if you expect the 435 * expression to evaluate to false. 436 * 437 * A few notes about usage: 438 * 439 * * Generally, __predict_false() error condition checks (unless 440 * you have some _strong_ reason to do otherwise, in which case 441 * document it), and/or __predict_true() `no-error' condition 442 * checks, assuming you want to optimize for the no-error case. 443 * 444 * * Other than that, if you don't know the likelihood of a test 445 * succeeding from empirical or other `hard' evidence, don't 446 * make predictions. 447 * 448 * * These are meant to be used in places that are run `a lot'. 449 * It is wasteful to make predictions in code that is run 450 * seldomly (e.g. at subsystem initialization time) as the 451 * basic block reordering that this affects can often generate 452 * larger code. 453 */ 454#if __GNUC_PREREQ__(2, 96) 455#define __predict_true(exp) __builtin_expect((exp), 1) 456#define __predict_false(exp) __builtin_expect((exp), 0) 457#else 458#define __predict_true(exp) (exp) 459#define __predict_false(exp) (exp) 460#endif 461 462#if __GNUC_PREREQ__(4, 0) 463#define __null_sentinel __attribute__((__sentinel__)) 464#define __exported __attribute__((__visibility__("default"))) 465#define __hidden __attribute__((__visibility__("hidden"))) 466#else 467#define __null_sentinel 468#define __exported 469#define __hidden 470#endif 471 472/* 473 * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h> 474 * require it. 475 */ 476#if __GNUC_PREREQ__(4, 1) 477#define __offsetof(type, field) __builtin_offsetof(type, field) 478#else 479#ifndef __cplusplus 480#define __offsetof(type, field) \ 481 ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field)) 482#else 483#define __offsetof(type, field) \ 484 (__offsetof__ (reinterpret_cast <__size_t> \ 485 (&reinterpret_cast <const volatile char &> \ 486 (static_cast<type *> (0)->field)))) 487#endif 488#endif 489#define __rangeof(type, start, end) \ 490 (__offsetof(type, end) - __offsetof(type, start)) 491 492/* 493 * Given the pointer x to the member m of the struct s, return 494 * a pointer to the containing structure. When using GCC, we first 495 * assign pointer x to a local variable, to check that its type is 496 * compatible with member m. 497 */ 498#if __GNUC_PREREQ__(3, 1) 499#define __containerof(x, s, m) ({ \ 500 const volatile __typeof(((s *)0)->m) *__x = (x); \ 501 __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\ 502}) 503#else 504#define __containerof(x, s, m) \ 505 __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m)) 506#endif 507 508/* 509 * Compiler-dependent macros to declare that functions take printf-like 510 * or scanf-like arguments. They are null except for versions of gcc 511 * that are known to support the features properly (old versions of gcc-2 512 * didn't permit keeping the keywords out of the application namespace). 513 */ 514#if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER) 515#define __printflike(fmtarg, firstvararg) 516#define __scanflike(fmtarg, firstvararg) 517#define __format_arg(fmtarg) 518#define __strfmonlike(fmtarg, firstvararg) 519#define __strftimelike(fmtarg, firstvararg) 520#else 521#define __printflike(fmtarg, firstvararg) \ 522 __attribute__((__format__ (__printf__, fmtarg, firstvararg))) 523#define __scanflike(fmtarg, firstvararg) \ 524 __attribute__((__format__ (__scanf__, fmtarg, firstvararg))) 525#define __format_arg(fmtarg) __attribute__((__format_arg__ (fmtarg))) 526#define __strfmonlike(fmtarg, firstvararg) \ 527 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg))) 528#define __strftimelike(fmtarg, firstvararg) \ 529 __attribute__((__format__ (__strftime__, fmtarg, firstvararg))) 530#endif 531 532/* 533 * FORTIFY_SOURCE, and perhaps other compiler-specific features, require 534 * the use of non-standard inlining. In general we should try to avoid 535 * using these but GCC-compatible compilers tend to support the extensions 536 * well enough to use them in limited cases. 537 */ 538#if defined(__GNUC_GNU_INLINE__) || defined(__GNUC_STDC_INLINE__) 539#if __GNUC_PREREQ__(4, 3) || __has_attribute(__artificial__) 540#define __gnu_inline __attribute__((__gnu_inline__, __artificial__)) 541#else 542#define __gnu_inline __attribute__((__gnu_inline__)) 543#endif /* artificial */ 544#else 545#define __gnu_inline 546#endif 547 548/* Compiler-dependent macros that rely on FreeBSD-specific extensions. */ 549#if defined(__FreeBSD_cc_version) && __FreeBSD_cc_version >= 300001 && \ 550 defined(__GNUC__) && !defined(__INTEL_COMPILER) 551#define __printf0like(fmtarg, firstvararg) \ 552 __attribute__((__format__ (__printf0__, fmtarg, firstvararg))) 553#else 554#define __printf0like(fmtarg, firstvararg) 555#endif 556 557#if defined(__GNUC__) || defined(__INTEL_COMPILER) 558#ifndef __INTEL_COMPILER 559#define __strong_reference(sym,aliassym) \ 560 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym))) 561#endif 562#ifdef __STDC__ 563#define __weak_reference(sym,alias) \ 564 __asm__(".weak " #alias); \ 565 __asm__(".equ " #alias ", " #sym) 566#define __warn_references(sym,msg) \ 567 __asm__(".section .gnu.warning." #sym); \ 568 __asm__(".asciz \"" msg "\""); \ 569 __asm__(".previous") 570#define __sym_compat(sym,impl,verid) \ 571 __asm__(".symver " #impl ", " #sym "@" #verid) 572#define __sym_default(sym,impl,verid) \ 573 __asm__(".symver " #impl ", " #sym "@@" #verid) 574#else 575#define __weak_reference(sym,alias) \ 576 __asm__(".weak alias"); \ 577 __asm__(".equ alias, sym") 578#define __warn_references(sym,msg) \ 579 __asm__(".section .gnu.warning.sym"); \ 580 __asm__(".asciz \"msg\""); \ 581 __asm__(".previous") 582#define __sym_compat(sym,impl,verid) \ 583 __asm__(".symver impl, sym@verid") 584#define __sym_default(impl,sym,verid) \ 585 __asm__(".symver impl, sym@@verid") 586#endif /* __STDC__ */ 587#endif /* __GNUC__ || __INTEL_COMPILER */ 588 589#define __GLOBL1(sym) __asm__(".globl " #sym) 590#define __GLOBL(sym) __GLOBL1(sym) 591 592#if defined(__GNUC__) || defined(__INTEL_COMPILER) 593#define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"") 594#else 595/* 596 * The following definition might not work well if used in header files, 597 * but it should be better than nothing. If you want a "do nothing" 598 * version, then it should generate some harmless declaration, such as: 599 * #define __IDSTRING(name,string) struct __hack 600 */ 601#define __IDSTRING(name,string) static const char name[] __unused = string 602#endif 603 604/* 605 * Embed the rcs id of a source file in the resulting library. Note that in 606 * more recent ELF binutils, we use .ident allowing the ID to be stripped. 607 * Usage: 608 * __FBSDID("$FreeBSD: releng/11.0/sys/sys/cdefs.h 300967 2016-05-29 17:32:19Z dim $"); 609 */ 610#ifndef __FBSDID 611#if !defined(lint) && !defined(STRIP_FBSDID) 612#define __FBSDID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s) 613#else 614#define __FBSDID(s) struct __hack 615#endif 616#endif 617 618#ifndef __RCSID 619#ifndef NO__RCSID 620#define __RCSID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s) 621#else 622#define __RCSID(s) struct __hack 623#endif 624#endif 625 626#ifndef __RCSID_SOURCE 627#ifndef NO__RCSID_SOURCE 628#define __RCSID_SOURCE(s) __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s) 629#else 630#define __RCSID_SOURCE(s) struct __hack 631#endif 632#endif 633 634#ifndef __SCCSID 635#ifndef NO__SCCSID 636#define __SCCSID(s) __IDSTRING(__CONCAT(__sccsid_,__LINE__),s) 637#else 638#define __SCCSID(s) struct __hack 639#endif 640#endif 641 642#ifndef __COPYRIGHT 643#ifndef NO__COPYRIGHT 644#define __COPYRIGHT(s) __IDSTRING(__CONCAT(__copyright_,__LINE__),s) 645#else 646#define __COPYRIGHT(s) struct __hack 647#endif 648#endif 649 650#ifndef __DECONST 651#define __DECONST(type, var) ((type)(__uintptr_t)(const void *)(var)) 652#endif 653 654#ifndef __DEVOLATILE 655#define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var)) 656#endif 657 658#ifndef __DEQUALIFY 659#define __DEQUALIFY(type, var) ((type)(__uintptr_t)(const volatile void *)(var)) 660#endif 661 662/*- 663 * The following definitions are an extension of the behavior originally 664 * implemented in <sys/_posix.h>, but with a different level of granularity. 665 * POSIX.1 requires that the macros we test be defined before any standard 666 * header file is included. 667 * 668 * Here's a quick run-down of the versions: 669 * defined(_POSIX_SOURCE) 1003.1-1988 670 * _POSIX_C_SOURCE == 1 1003.1-1990 671 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option 672 * _POSIX_C_SOURCE == 199309 1003.1b-1993 673 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995, 674 * and the omnibus ISO/IEC 9945-1: 1996 675 * _POSIX_C_SOURCE == 200112 1003.1-2001 676 * _POSIX_C_SOURCE == 200809 1003.1-2008 677 * 678 * In addition, the X/Open Portability Guide, which is now the Single UNIX 679 * Specification, defines a feature-test macro which indicates the version of 680 * that specification, and which subsumes _POSIX_C_SOURCE. 681 * 682 * Our macros begin with two underscores to avoid namespace screwage. 683 */ 684 685/* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */ 686#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1 687#undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */ 688#define _POSIX_C_SOURCE 199009 689#endif 690 691/* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */ 692#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2 693#undef _POSIX_C_SOURCE 694#define _POSIX_C_SOURCE 199209 695#endif 696 697/* Deal with various X/Open Portability Guides and Single UNIX Spec. */ 698#ifdef _XOPEN_SOURCE 699#if _XOPEN_SOURCE - 0 >= 700 700#define __XSI_VISIBLE 700 701#undef _POSIX_C_SOURCE 702#define _POSIX_C_SOURCE 200809 703#elif _XOPEN_SOURCE - 0 >= 600 704#define __XSI_VISIBLE 600 705#undef _POSIX_C_SOURCE 706#define _POSIX_C_SOURCE 200112 707#elif _XOPEN_SOURCE - 0 >= 500 708#define __XSI_VISIBLE 500 709#undef _POSIX_C_SOURCE 710#define _POSIX_C_SOURCE 199506 711#endif 712#endif 713 714/* 715 * Deal with all versions of POSIX. The ordering relative to the tests above is 716 * important. 717 */ 718#if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE) 719#define _POSIX_C_SOURCE 198808 720#endif 721#ifdef _POSIX_C_SOURCE 722#if _POSIX_C_SOURCE >= 200809 723#define __POSIX_VISIBLE 200809 724#define __ISO_C_VISIBLE 1999 725#elif _POSIX_C_SOURCE >= 200112 726#define __POSIX_VISIBLE 200112 727#define __ISO_C_VISIBLE 1999 728#elif _POSIX_C_SOURCE >= 199506 729#define __POSIX_VISIBLE 199506 730#define __ISO_C_VISIBLE 1990 731#elif _POSIX_C_SOURCE >= 199309 732#define __POSIX_VISIBLE 199309 733#define __ISO_C_VISIBLE 1990 734#elif _POSIX_C_SOURCE >= 199209 735#define __POSIX_VISIBLE 199209 736#define __ISO_C_VISIBLE 1990 737#elif _POSIX_C_SOURCE >= 199009 738#define __POSIX_VISIBLE 199009 739#define __ISO_C_VISIBLE 1990 740#else 741#define __POSIX_VISIBLE 198808 742#define __ISO_C_VISIBLE 0 743#endif /* _POSIX_C_SOURCE */ 744#else 745/*- 746 * Deal with _ANSI_SOURCE: 747 * If it is defined, and no other compilation environment is explicitly 748 * requested, then define our internal feature-test macros to zero. This 749 * makes no difference to the preprocessor (undefined symbols in preprocessing 750 * expressions are defined to have value zero), but makes it more convenient for 751 * a test program to print out the values. 752 * 753 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as 754 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation 755 * environment (and in fact we will never get here). 756 */ 757#if defined(_ANSI_SOURCE) /* Hide almost everything. */ 758#define __POSIX_VISIBLE 0 759#define __XSI_VISIBLE 0 760#define __BSD_VISIBLE 0 761#define __ISO_C_VISIBLE 1990 762#elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */ 763#define __POSIX_VISIBLE 0 764#define __XSI_VISIBLE 0 765#define __BSD_VISIBLE 0 766#define __ISO_C_VISIBLE 1999 767#elif defined(_C11_SOURCE) /* Localism to specify strict C11 env. */ 768#define __POSIX_VISIBLE 0 769#define __XSI_VISIBLE 0 770#define __BSD_VISIBLE 0 771#define __ISO_C_VISIBLE 2011 772#else /* Default environment: show everything. */ 773#define __POSIX_VISIBLE 200809 774#define __XSI_VISIBLE 700 775#define __BSD_VISIBLE 1 776#define __ISO_C_VISIBLE 2011 777#endif 778#endif 779 780#if defined(__mips) || defined(__powerpc64__) || defined(__riscv__) 781#define __NO_TLS 1 782#endif 783 784/* 785 * Old versions of GCC use non-standard ARM arch symbols; acle-compat.h 786 * translates them to __ARM_ARCH and the modern feature symbols defined by ARM. 787 */ 788#if defined(__arm__) && !defined(__ARM_ARCH) 789#include <machine/acle-compat.h> 790#endif 791 792/* 793 * Type Safety Checking 794 * 795 * Clang provides additional attributes to enable checking type safety 796 * properties that cannot be enforced by the C type system. 797 */ 798 799#if __has_attribute(__argument_with_type_tag__) && \ 800 __has_attribute(__type_tag_for_datatype__) && !defined(lint) 801#define __arg_type_tag(arg_kind, arg_idx, type_tag_idx) \ 802 __attribute__((__argument_with_type_tag__(arg_kind, arg_idx, type_tag_idx))) 803#define __datatype_type_tag(kind, type) \ 804 __attribute__((__type_tag_for_datatype__(kind, type))) 805#else 806#define __arg_type_tag(arg_kind, arg_idx, type_tag_idx) 807#define __datatype_type_tag(kind, type) 808#endif 809 810/* 811 * Lock annotations. 812 * 813 * Clang provides support for doing basic thread-safety tests at 814 * compile-time, by marking which locks will/should be held when 815 * entering/leaving a functions. 816 * 817 * Furthermore, it is also possible to annotate variables and structure 818 * members to enforce that they are only accessed when certain locks are 819 * held. 820 */ 821 822#if __has_extension(c_thread_safety_attributes) 823#define __lock_annotate(x) __attribute__((x)) 824#else 825#define __lock_annotate(x) 826#endif 827 828/* Structure implements a lock. */ 829#define __lockable __lock_annotate(lockable) 830 831/* Function acquires an exclusive or shared lock. */ 832#define __locks_exclusive(...) \ 833 __lock_annotate(exclusive_lock_function(__VA_ARGS__)) 834#define __locks_shared(...) \ 835 __lock_annotate(shared_lock_function(__VA_ARGS__)) 836 837/* Function attempts to acquire an exclusive or shared lock. */ 838#define __trylocks_exclusive(...) \ 839 __lock_annotate(exclusive_trylock_function(__VA_ARGS__)) 840#define __trylocks_shared(...) \ 841 __lock_annotate(shared_trylock_function(__VA_ARGS__)) 842 843/* Function releases a lock. */ 844#define __unlocks(...) __lock_annotate(unlock_function(__VA_ARGS__)) 845 846/* Function asserts that an exclusive or shared lock is held. */ 847#define __asserts_exclusive(...) \ 848 __lock_annotate(assert_exclusive_lock(__VA_ARGS__)) 849#define __asserts_shared(...) \ 850 __lock_annotate(assert_shared_lock(__VA_ARGS__)) 851 852/* Function requires that an exclusive or shared lock is or is not held. */ 853#define __requires_exclusive(...) \ 854 __lock_annotate(exclusive_locks_required(__VA_ARGS__)) 855#define __requires_shared(...) \ 856 __lock_annotate(shared_locks_required(__VA_ARGS__)) 857#define __requires_unlocked(...) \ 858 __lock_annotate(locks_excluded(__VA_ARGS__)) 859 860/* Function should not be analyzed. */ 861#define __no_lock_analysis __lock_annotate(no_thread_safety_analysis) 862 863/* Guard variables and structure members by lock. */ 864#define __guarded_by(x) __lock_annotate(guarded_by(x)) 865#define __pt_guarded_by(x) __lock_annotate(pt_guarded_by(x)) 866 867#endif /* !_SYS_CDEFS_H_ */ 868