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