2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Berkeley Software Design, Inc.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
34 * @(#)cdefs.h 8.8 (Berkeley) 1/9/95
42 * Testing against Clang-specific extensions.
44 #ifndef __has_attribute
45 #define __has_attribute(x) 0
47 #ifndef __has_extension
48 #define __has_extension __has_feature
51 #define __has_feature(x) 0
54 #define __has_include(x) 0
57 #define __has_builtin(x) 0
60 #if defined(__cplusplus)
61 #define __BEGIN_DECLS extern "C" {
69 * This code has been put in place to help reduce the addition of
70 * compiler specific defines in FreeBSD code. It helps to aid in
71 * having a compiler-agnostic source tree.
74 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
76 #if __GNUC__ >= 3 || defined(__INTEL_COMPILER)
77 #define __GNUCLIKE_ASM 3
78 #define __GNUCLIKE_MATH_BUILTIN_CONSTANTS
80 #define __GNUCLIKE_ASM 2
82 #define __GNUCLIKE___TYPEOF 1
83 #define __GNUCLIKE___OFFSETOF 1
84 #define __GNUCLIKE___SECTION 1
86 #ifndef __INTEL_COMPILER
87 #define __GNUCLIKE_CTOR_SECTION_HANDLING 1
90 #define __GNUCLIKE_BUILTIN_CONSTANT_P 1
91 #if defined(__INTEL_COMPILER) && defined(__cplusplus) && \
92 __INTEL_COMPILER < 800
93 #undef __GNUCLIKE_BUILTIN_CONSTANT_P
96 #if (__GNUC_MINOR__ > 95 || __GNUC__ >= 3)
97 #define __GNUCLIKE_BUILTIN_VARARGS 1
98 #define __GNUCLIKE_BUILTIN_STDARG 1
99 #define __GNUCLIKE_BUILTIN_VAALIST 1
102 #if defined(__GNUC__)
103 #define __GNUC_VA_LIST_COMPATIBILITY 1
107 * Compiler memory barriers, specific to gcc and clang.
109 #if defined(__GNUC__)
110 #define __compiler_membar() __asm __volatile(" " : : : "memory")
113 #ifndef __INTEL_COMPILER
114 #define __GNUCLIKE_BUILTIN_NEXT_ARG 1
115 #define __GNUCLIKE_MATH_BUILTIN_RELOPS
118 #define __GNUCLIKE_BUILTIN_MEMCPY 1
120 /* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */
121 #define __CC_SUPPORTS_INLINE 1
122 #define __CC_SUPPORTS___INLINE 1
123 #define __CC_SUPPORTS___INLINE__ 1
125 #define __CC_SUPPORTS___FUNC__ 1
126 #define __CC_SUPPORTS_WARNING 1
128 #define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
130 #define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
132 #endif /* __GNUC__ || __INTEL_COMPILER */
135 * Macro to test if we're using a specific version of gcc or later.
137 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
138 #define __GNUC_PREREQ__(ma, mi) \
139 (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
141 #define __GNUC_PREREQ__(ma, mi) 0
145 * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
146 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
147 * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
148 * mode -- there must be no spaces between its arguments, and for nested
149 * __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also
150 * concatenate double-quoted strings produced by the __STRING macro, but
151 * this only works with ANSI C.
153 * __XSTRING is like __STRING, but it expands any macros in its argument
154 * first. It is only available with ANSI C.
156 #if defined(__STDC__) || defined(__cplusplus)
157 #define __P(protos) protos /* full-blown ANSI C */
158 #define __CONCAT1(x,y) x ## y
159 #define __CONCAT(x,y) __CONCAT1(x,y)
160 #define __STRING(x) #x /* stringify without expanding x */
161 #define __XSTRING(x) __STRING(x) /* expand x, then stringify */
163 #define __const const /* define reserved names to standard */
164 #define __signed signed
165 #define __volatile volatile
166 #if defined(__cplusplus)
167 #define __inline inline /* convert to C++ keyword */
169 #if !(defined(__CC_SUPPORTS___INLINE))
170 #define __inline /* delete GCC keyword */
171 #endif /* ! __CC_SUPPORTS___INLINE */
172 #endif /* !__cplusplus */
174 #else /* !(__STDC__ || __cplusplus) */
175 #define __P(protos) () /* traditional C preprocessor */
176 #define __CONCAT(x,y) x/**/y
177 #define __STRING(x) "x"
179 #if !defined(__CC_SUPPORTS___INLINE)
180 #define __const /* delete pseudo-ANSI C keywords */
185 * In non-ANSI C environments, new programs will want ANSI-only C keywords
186 * deleted from the program and old programs will want them left alone.
187 * When using a compiler other than gcc, programs using the ANSI C keywords
188 * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
189 * When using "gcc -traditional", we assume that this is the intent; if
190 * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
192 #ifndef NO_ANSI_KEYWORDS
193 #define const /* delete ANSI C keywords */
197 #endif /* !NO_ANSI_KEYWORDS */
198 #endif /* !__CC_SUPPORTS___INLINE */
199 #endif /* !(__STDC__ || __cplusplus) */
202 * Compiler-dependent macros to help declare dead (non-returning) and
203 * pure (no side effects) functions, and unused variables. They are
204 * null except for versions of gcc that are known to support the features
205 * properly (old versions of gcc-2 supported the dead and pure features
206 * in a different (wrong) way). If we do not provide an implementation
207 * for a given compiler, let the compile fail if it is told to use
208 * a feature that we cannot live without.
210 #define __weak_symbol __attribute__((__weak__))
211 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
216 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
217 #define __dead2 __attribute__((__noreturn__))
218 #define __pure2 __attribute__((__const__))
220 /* XXX Find out what to do for __packed, __aligned and __section */
222 #if __GNUC_PREREQ__(2, 7) || defined(__INTEL_COMPILER)
223 #define __dead2 __attribute__((__noreturn__))
224 #define __pure2 __attribute__((__const__))
225 #define __unused __attribute__((__unused__))
226 #define __used __attribute__((__used__))
227 #define __packed __attribute__((__packed__))
228 #define __aligned(x) __attribute__((__aligned__(x)))
229 #define __section(x) __attribute__((__section__(x)))
231 #if __GNUC_PREREQ__(4, 3) || __has_attribute(__alloc_size__)
232 #define __alloc_size(x) __attribute__((__alloc_size__(x)))
234 #define __alloc_size(x)
236 #if __GNUC_PREREQ__(4, 9) || __has_attribute(__alloc_align__)
237 #define __alloc_align(x) __attribute__((__alloc_align__(x)))
239 #define __alloc_align(x)
242 #if !__GNUC_PREREQ__(2, 95)
243 #define __alignof(x) __offsetof(struct { char __a; x __b; }, __b)
247 * Keywords added in C11.
250 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L
252 #if !__has_extension(c_alignas)
253 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
254 __has_extension(cxx_alignas)
255 #define _Alignas(x) alignas(x)
257 /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */
258 #define _Alignas(x) __aligned(x)
262 #if defined(__cplusplus) && __cplusplus >= 201103L
263 #define _Alignof(x) alignof(x)
265 #define _Alignof(x) __alignof(x)
268 #if !defined(__cplusplus) && !__has_extension(c_atomic) && \
269 !__has_extension(cxx_atomic)
271 * No native support for _Atomic(). Place object in structure to prevent
272 * most forms of direct non-atomic access.
274 #define _Atomic(T) struct { T volatile __val; }
277 #if defined(__cplusplus) && __cplusplus >= 201103L
278 #define _Noreturn [[noreturn]]
280 #define _Noreturn __dead2
283 #if !__has_extension(c_static_assert)
284 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
285 __has_extension(cxx_static_assert)
286 #define _Static_assert(x, y) static_assert(x, y)
287 #elif __GNUC_PREREQ__(4,6) && !defined(__cplusplus)
288 /* Nothing, gcc 4.6 and higher has _Static_assert built-in */
289 #elif defined(__COUNTER__)
290 #define _Static_assert(x, y) __Static_assert(x, __COUNTER__)
291 #define __Static_assert(x, y) ___Static_assert(x, y)
292 #define ___Static_assert(x, y) typedef char __assert_ ## y[(x) ? 1 : -1] \
295 #define _Static_assert(x, y) struct __hack
299 #if !__has_extension(c_thread_local)
301 * XXX: Some compilers (Clang 3.3, GCC 4.7) falsely announce C++11 mode
302 * without actually supporting the thread_local keyword. Don't check for
303 * the presence of C++11 when defining _Thread_local.
305 #if /* (defined(__cplusplus) && __cplusplus >= 201103L) || */ \
306 __has_extension(cxx_thread_local)
307 #define _Thread_local thread_local
309 #define _Thread_local __thread
313 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
316 * Emulation of C11 _Generic(). Unlike the previously defined C11
317 * keywords, it is not possible to implement this using exactly the same
318 * syntax. Therefore implement something similar under the name
319 * __generic(). Unlike _Generic(), this macro can only distinguish
320 * between a single type, so it requires nested invocations to
321 * distinguish multiple cases.
324 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
325 __has_extension(c_generic_selections)
326 #define __generic(expr, t, yes, no) \
327 _Generic(expr, t: yes, default: no)
328 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
329 #define __generic(expr, t, yes, no) \
330 __builtin_choose_expr( \
331 __builtin_types_compatible_p(__typeof(expr), t), yes, no)
335 * C99 Static array indices in function parameter declarations. Syntax such as:
336 * void bar(int myArray[static 10]);
337 * is allowed in C99 but not in C++. Define __min_size appropriately so
338 * headers using it can be compiled in either language. Use like this:
339 * void bar(int myArray[__min_size(10)]);
341 #if !defined(__cplusplus) && \
342 (defined(__clang__) || __GNUC_PREREQ__(4, 6)) && \
343 (!defined(__STDC_VERSION__) || (__STDC_VERSION__ >= 199901))
344 #define __min_size(x) static (x)
346 #define __min_size(x) (x)
349 #if __GNUC_PREREQ__(2, 96)
350 #define __malloc_like __attribute__((__malloc__))
351 #define __pure __attribute__((__pure__))
353 #define __malloc_like
357 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
358 #define __always_inline __attribute__((__always_inline__))
360 #define __always_inline
363 #if __GNUC_PREREQ__(3, 1)
364 #define __noinline __attribute__ ((__noinline__))
369 #if __GNUC_PREREQ__(3, 4)
370 #define __fastcall __attribute__((__fastcall__))
371 #define __result_use_check __attribute__((__warn_unused_result__))
374 #define __result_use_check
377 #if __GNUC_PREREQ__(4, 1)
378 #define __returns_twice __attribute__((__returns_twice__))
380 #define __returns_twice
383 #if __GNUC_PREREQ__(4, 6) || __has_builtin(__builtin_unreachable)
384 #define __unreachable() __builtin_unreachable()
386 #define __unreachable() ((void)0)
389 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
390 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
391 #define __func__ NULL
394 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
395 #define __LONG_LONG_SUPPORTED
398 /* C++11 exposes a load of C99 stuff */
399 #if defined(__cplusplus) && __cplusplus >= 201103L
400 #define __LONG_LONG_SUPPORTED
401 #ifndef __STDC_LIMIT_MACROS
402 #define __STDC_LIMIT_MACROS
404 #ifndef __STDC_CONSTANT_MACROS
405 #define __STDC_CONSTANT_MACROS
410 * GCC 2.95 provides `__restrict' as an extension to C90 to support the
411 * C99-specific `restrict' type qualifier. We happen to use `__restrict' as
412 * a way to define the `restrict' type qualifier without disturbing older
413 * software that is unaware of C99 keywords.
415 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
416 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901
419 #define __restrict restrict
424 * GNU C version 2.96 adds explicit branch prediction so that
425 * the CPU back-end can hint the processor and also so that
426 * code blocks can be reordered such that the predicted path
427 * sees a more linear flow, thus improving cache behavior, etc.
429 * The following two macros provide us with a way to utilize this
430 * compiler feature. Use __predict_true() if you expect the expression
431 * to evaluate to true, and __predict_false() if you expect the
432 * expression to evaluate to false.
434 * A few notes about usage:
436 * * Generally, __predict_false() error condition checks (unless
437 * you have some _strong_ reason to do otherwise, in which case
438 * document it), and/or __predict_true() `no-error' condition
439 * checks, assuming you want to optimize for the no-error case.
441 * * Other than that, if you don't know the likelihood of a test
442 * succeeding from empirical or other `hard' evidence, don't
445 * * These are meant to be used in places that are run `a lot'.
446 * It is wasteful to make predictions in code that is run
447 * seldomly (e.g. at subsystem initialization time) as the
448 * basic block reordering that this affects can often generate
451 #if __GNUC_PREREQ__(2, 96)
452 #define __predict_true(exp) __builtin_expect((exp), 1)
453 #define __predict_false(exp) __builtin_expect((exp), 0)
455 #define __predict_true(exp) (exp)
456 #define __predict_false(exp) (exp)
459 #if __GNUC_PREREQ__(4, 0)
460 #define __null_sentinel __attribute__((__sentinel__))
461 #define __exported __attribute__((__visibility__("default")))
462 #define __hidden __attribute__((__visibility__("hidden")))
464 #define __null_sentinel
470 * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
473 #if __GNUC_PREREQ__(4, 1)
474 #define __offsetof(type, field) __builtin_offsetof(type, field)
477 #define __offsetof(type, field) \
478 ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
480 #define __offsetof(type, field) \
481 (__offsetof__ (reinterpret_cast <__size_t> \
482 (&reinterpret_cast <const volatile char &> \
483 (static_cast<type *> (0)->field))))
486 #define __rangeof(type, start, end) \
487 (__offsetof(type, end) - __offsetof(type, start))
490 * Given the pointer x to the member m of the struct s, return
491 * a pointer to the containing structure. When using GCC, we first
492 * assign pointer x to a local variable, to check that its type is
493 * compatible with member m.
495 #if __GNUC_PREREQ__(3, 1)
496 #define __containerof(x, s, m) ({ \
497 const volatile __typeof(((s *)0)->m) *__x = (x); \
498 __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
501 #define __containerof(x, s, m) \
502 __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
506 * Compiler-dependent macros to declare that functions take printf-like
507 * or scanf-like arguments. They are null except for versions of gcc
508 * that are known to support the features properly (old versions of gcc-2
509 * didn't permit keeping the keywords out of the application namespace).
511 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
512 #define __printflike(fmtarg, firstvararg)
513 #define __scanflike(fmtarg, firstvararg)
514 #define __format_arg(fmtarg)
515 #define __strfmonlike(fmtarg, firstvararg)
516 #define __strftimelike(fmtarg, firstvararg)
518 #define __printflike(fmtarg, firstvararg) \
519 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
520 #define __scanflike(fmtarg, firstvararg) \
521 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
522 #define __format_arg(fmtarg) __attribute__((__format_arg__ (fmtarg)))
523 #define __strfmonlike(fmtarg, firstvararg) \
524 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
525 #define __strftimelike(fmtarg, firstvararg) \
526 __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
529 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
530 #if defined(__FreeBSD_cc_version) && __FreeBSD_cc_version >= 300001 && \
531 defined(__GNUC__) && !defined(__INTEL_COMPILER)
532 #define __printf0like(fmtarg, firstvararg) \
533 __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
535 #define __printf0like(fmtarg, firstvararg)
538 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
539 #ifndef __INTEL_COMPILER
540 #define __strong_reference(sym,aliassym) \
541 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
544 #define __weak_reference(sym,alias) \
545 __asm__(".weak " #alias); \
546 __asm__(".equ " #alias ", " #sym)
547 #define __warn_references(sym,msg) \
548 __asm__(".section .gnu.warning." #sym); \
549 __asm__(".asciz \"" msg "\""); \
551 #define __sym_compat(sym,impl,verid) \
552 __asm__(".symver " #impl ", " #sym "@" #verid)
553 #define __sym_default(sym,impl,verid) \
554 __asm__(".symver " #impl ", " #sym "@@" #verid)
556 #define __weak_reference(sym,alias) \
557 __asm__(".weak alias"); \
558 __asm__(".equ alias, sym")
559 #define __warn_references(sym,msg) \
560 __asm__(".section .gnu.warning.sym"); \
561 __asm__(".asciz \"msg\""); \
563 #define __sym_compat(sym,impl,verid) \
564 __asm__(".symver impl, sym@verid")
565 #define __sym_default(impl,sym,verid) \
566 __asm__(".symver impl, sym@@verid")
567 #endif /* __STDC__ */
568 #endif /* __GNUC__ || __INTEL_COMPILER */
570 #define __GLOBL1(sym) __asm__(".globl " #sym)
571 #define __GLOBL(sym) __GLOBL1(sym)
573 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
574 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
577 * The following definition might not work well if used in header files,
578 * but it should be better than nothing. If you want a "do nothing"
579 * version, then it should generate some harmless declaration, such as:
580 * #define __IDSTRING(name,string) struct __hack
582 #define __IDSTRING(name,string) static const char name[] __unused = string
586 * Embed the rcs id of a source file in the resulting library. Note that in
587 * more recent ELF binutils, we use .ident allowing the ID to be stripped.
589 * __FBSDID("$FreeBSD$");
592 #if !defined(lint) && !defined(STRIP_FBSDID)
593 #define __FBSDID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
595 #define __FBSDID(s) struct __hack
601 #define __RCSID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
603 #define __RCSID(s) struct __hack
607 #ifndef __RCSID_SOURCE
608 #ifndef NO__RCSID_SOURCE
609 #define __RCSID_SOURCE(s) __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
611 #define __RCSID_SOURCE(s) struct __hack
617 #define __SCCSID(s) __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
619 #define __SCCSID(s) struct __hack
624 #ifndef NO__COPYRIGHT
625 #define __COPYRIGHT(s) __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
627 #define __COPYRIGHT(s) struct __hack
632 #define __DECONST(type, var) ((type)(__uintptr_t)(const void *)(var))
636 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
640 #define __DEQUALIFY(type, var) ((type)(__uintptr_t)(const volatile void *)(var))
644 * The following definitions are an extension of the behavior originally
645 * implemented in <sys/_posix.h>, but with a different level of granularity.
646 * POSIX.1 requires that the macros we test be defined before any standard
647 * header file is included.
649 * Here's a quick run-down of the versions:
650 * defined(_POSIX_SOURCE) 1003.1-1988
651 * _POSIX_C_SOURCE == 1 1003.1-1990
652 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option
653 * _POSIX_C_SOURCE == 199309 1003.1b-1993
654 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995,
655 * and the omnibus ISO/IEC 9945-1: 1996
656 * _POSIX_C_SOURCE == 200112 1003.1-2001
657 * _POSIX_C_SOURCE == 200809 1003.1-2008
659 * In addition, the X/Open Portability Guide, which is now the Single UNIX
660 * Specification, defines a feature-test macro which indicates the version of
661 * that specification, and which subsumes _POSIX_C_SOURCE.
663 * Our macros begin with two underscores to avoid namespace screwage.
666 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
667 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
668 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
669 #define _POSIX_C_SOURCE 199009
672 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
673 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
674 #undef _POSIX_C_SOURCE
675 #define _POSIX_C_SOURCE 199209
678 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
680 #if _XOPEN_SOURCE - 0 >= 700
681 #define __XSI_VISIBLE 700
682 #undef _POSIX_C_SOURCE
683 #define _POSIX_C_SOURCE 200809
684 #elif _XOPEN_SOURCE - 0 >= 600
685 #define __XSI_VISIBLE 600
686 #undef _POSIX_C_SOURCE
687 #define _POSIX_C_SOURCE 200112
688 #elif _XOPEN_SOURCE - 0 >= 500
689 #define __XSI_VISIBLE 500
690 #undef _POSIX_C_SOURCE
691 #define _POSIX_C_SOURCE 199506
696 * Deal with all versions of POSIX. The ordering relative to the tests above is
699 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
700 #define _POSIX_C_SOURCE 198808
702 #ifdef _POSIX_C_SOURCE
703 #if _POSIX_C_SOURCE >= 200809
704 #define __POSIX_VISIBLE 200809
705 #define __ISO_C_VISIBLE 1999
706 #elif _POSIX_C_SOURCE >= 200112
707 #define __POSIX_VISIBLE 200112
708 #define __ISO_C_VISIBLE 1999
709 #elif _POSIX_C_SOURCE >= 199506
710 #define __POSIX_VISIBLE 199506
711 #define __ISO_C_VISIBLE 1990
712 #elif _POSIX_C_SOURCE >= 199309
713 #define __POSIX_VISIBLE 199309
714 #define __ISO_C_VISIBLE 1990
715 #elif _POSIX_C_SOURCE >= 199209
716 #define __POSIX_VISIBLE 199209
717 #define __ISO_C_VISIBLE 1990
718 #elif _POSIX_C_SOURCE >= 199009
719 #define __POSIX_VISIBLE 199009
720 #define __ISO_C_VISIBLE 1990
722 #define __POSIX_VISIBLE 198808
723 #define __ISO_C_VISIBLE 0
724 #endif /* _POSIX_C_SOURCE */
727 * Deal with _ANSI_SOURCE:
728 * If it is defined, and no other compilation environment is explicitly
729 * requested, then define our internal feature-test macros to zero. This
730 * makes no difference to the preprocessor (undefined symbols in preprocessing
731 * expressions are defined to have value zero), but makes it more convenient for
732 * a test program to print out the values.
734 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
735 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
736 * environment (and in fact we will never get here).
738 #if defined(_ANSI_SOURCE) /* Hide almost everything. */
739 #define __POSIX_VISIBLE 0
740 #define __XSI_VISIBLE 0
741 #define __BSD_VISIBLE 0
742 #define __ISO_C_VISIBLE 1990
743 #define __EXT1_VISIBLE 0
744 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
745 #define __POSIX_VISIBLE 0
746 #define __XSI_VISIBLE 0
747 #define __BSD_VISIBLE 0
748 #define __ISO_C_VISIBLE 1999
749 #define __EXT1_VISIBLE 0
750 #elif defined(_C11_SOURCE) /* Localism to specify strict C11 env. */
751 #define __POSIX_VISIBLE 0
752 #define __XSI_VISIBLE 0
753 #define __BSD_VISIBLE 0
754 #define __ISO_C_VISIBLE 2011
755 #define __EXT1_VISIBLE 0
756 #else /* Default environment: show everything. */
757 #define __POSIX_VISIBLE 200809
758 #define __XSI_VISIBLE 700
759 #define __BSD_VISIBLE 1
760 #define __ISO_C_VISIBLE 2011
761 #define __EXT1_VISIBLE 1
765 /* User override __EXT1_VISIBLE */
766 #if defined(__STDC_WANT_LIB_EXT1__)
767 #undef __EXT1_VISIBLE
768 #if __STDC_WANT_LIB_EXT1__
769 #define __EXT1_VISIBLE 1
771 #define __EXT1_VISIBLE 0
773 #endif /* __STDC_WANT_LIB_EXT1__ */
775 #if defined(__mips) || defined(__powerpc64__) || defined(__riscv)
780 * Old versions of GCC use non-standard ARM arch symbols; acle-compat.h
781 * translates them to __ARM_ARCH and the modern feature symbols defined by ARM.
783 #if defined(__arm__) && !defined(__ARM_ARCH)
784 #include <machine/acle-compat.h>
788 * Nullability qualifiers: currently only supported by Clang.
790 #if !(defined(__clang__) && __has_feature(nullability))
793 #define _Null_unspecified
794 #define __NULLABILITY_PRAGMA_PUSH
795 #define __NULLABILITY_PRAGMA_POP
797 #define __NULLABILITY_PRAGMA_PUSH _Pragma("clang diagnostic push") \
798 _Pragma("clang diagnostic ignored \"-Wnullability-completeness\"")
799 #define __NULLABILITY_PRAGMA_POP _Pragma("clang diagnostic pop")
803 * Type Safety Checking
805 * Clang provides additional attributes to enable checking type safety
806 * properties that cannot be enforced by the C type system.
809 #if __has_attribute(__argument_with_type_tag__) && \
810 __has_attribute(__type_tag_for_datatype__)
811 #define __arg_type_tag(arg_kind, arg_idx, type_tag_idx) \
812 __attribute__((__argument_with_type_tag__(arg_kind, arg_idx, type_tag_idx)))
813 #define __datatype_type_tag(kind, type) \
814 __attribute__((__type_tag_for_datatype__(kind, type)))
816 #define __arg_type_tag(arg_kind, arg_idx, type_tag_idx)
817 #define __datatype_type_tag(kind, type)
823 * Clang provides support for doing basic thread-safety tests at
824 * compile-time, by marking which locks will/should be held when
825 * entering/leaving a functions.
827 * Furthermore, it is also possible to annotate variables and structure
828 * members to enforce that they are only accessed when certain locks are
832 #if __has_extension(c_thread_safety_attributes)
833 #define __lock_annotate(x) __attribute__((x))
835 #define __lock_annotate(x)
838 /* Structure implements a lock. */
839 #define __lockable __lock_annotate(lockable)
841 /* Function acquires an exclusive or shared lock. */
842 #define __locks_exclusive(...) \
843 __lock_annotate(exclusive_lock_function(__VA_ARGS__))
844 #define __locks_shared(...) \
845 __lock_annotate(shared_lock_function(__VA_ARGS__))
847 /* Function attempts to acquire an exclusive or shared lock. */
848 #define __trylocks_exclusive(...) \
849 __lock_annotate(exclusive_trylock_function(__VA_ARGS__))
850 #define __trylocks_shared(...) \
851 __lock_annotate(shared_trylock_function(__VA_ARGS__))
853 /* Function releases a lock. */
854 #define __unlocks(...) __lock_annotate(unlock_function(__VA_ARGS__))
856 /* Function asserts that an exclusive or shared lock is held. */
857 #define __asserts_exclusive(...) \
858 __lock_annotate(assert_exclusive_lock(__VA_ARGS__))
859 #define __asserts_shared(...) \
860 __lock_annotate(assert_shared_lock(__VA_ARGS__))
862 /* Function requires that an exclusive or shared lock is or is not held. */
863 #define __requires_exclusive(...) \
864 __lock_annotate(exclusive_locks_required(__VA_ARGS__))
865 #define __requires_shared(...) \
866 __lock_annotate(shared_locks_required(__VA_ARGS__))
867 #define __requires_unlocked(...) \
868 __lock_annotate(locks_excluded(__VA_ARGS__))
870 /* Function should not be analyzed. */
871 #define __no_lock_analysis __lock_annotate(no_thread_safety_analysis)
873 /* Guard variables and structure members by lock. */
874 #define __guarded_by(x) __lock_annotate(guarded_by(x))
875 #define __pt_guarded_by(x) __lock_annotate(pt_guarded_by(x))
877 #endif /* !_SYS_CDEFS_H_ */