2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Berkeley Software Design, Inc.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
32 * @(#)cdefs.h 8.8 (Berkeley) 1/9/95
40 * Testing against Clang-specific extensions.
43 #ifndef __has_attribute
44 #define __has_attribute(x) 0
46 #ifndef __has_extension
47 #define __has_extension __has_feature
50 #define __has_feature(x) 0
53 #define __has_include(x) 0
56 #define __has_builtin(x) 0
59 #if defined(__cplusplus)
60 #define __BEGIN_DECLS extern "C" {
68 * This code has been put in place to help reduce the addition of
69 * compiler specific defines in FreeBSD code. It helps to aid in
70 * having a compiler-agnostic source tree.
73 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
75 #if __GNUC__ >= 3 || defined(__INTEL_COMPILER)
76 #define __GNUCLIKE_ASM 3
77 #define __GNUCLIKE_MATH_BUILTIN_CONSTANTS
79 #define __GNUCLIKE_ASM 2
81 #define __GNUCLIKE___TYPEOF 1
82 #define __GNUCLIKE___OFFSETOF 1
83 #define __GNUCLIKE___SECTION 1
85 #ifndef __INTEL_COMPILER
86 #define __GNUCLIKE_CTOR_SECTION_HANDLING 1
89 #define __GNUCLIKE_BUILTIN_CONSTANT_P 1
90 #if defined(__INTEL_COMPILER) && defined(__cplusplus) && \
91 __INTEL_COMPILER < 800
92 #undef __GNUCLIKE_BUILTIN_CONSTANT_P
95 #if (__GNUC_MINOR__ > 95 || __GNUC__ >= 3)
96 #define __GNUCLIKE_BUILTIN_VARARGS 1
97 #define __GNUCLIKE_BUILTIN_STDARG 1
98 #define __GNUCLIKE_BUILTIN_VAALIST 1
101 #if defined(__GNUC__)
102 #define __GNUC_VA_LIST_COMPATIBILITY 1
106 * Compiler memory barriers, specific to gcc and clang.
108 #if defined(__GNUC__)
109 #define __compiler_membar() __asm __volatile(" " : : : "memory")
112 #ifndef __INTEL_COMPILER
113 #define __GNUCLIKE_BUILTIN_NEXT_ARG 1
114 #define __GNUCLIKE_MATH_BUILTIN_RELOPS
117 #define __GNUCLIKE_BUILTIN_MEMCPY 1
119 /* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */
120 #define __CC_SUPPORTS_INLINE 1
121 #define __CC_SUPPORTS___INLINE 1
122 #define __CC_SUPPORTS___INLINE__ 1
124 #define __CC_SUPPORTS___FUNC__ 1
125 #define __CC_SUPPORTS_WARNING 1
127 #define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
129 #define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
131 #endif /* __GNUC__ || __INTEL_COMPILER */
134 * Macro to test if we're using a specific version of gcc or later.
136 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
137 #define __GNUC_PREREQ__(ma, mi) \
138 (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
140 #define __GNUC_PREREQ__(ma, mi) 0
144 * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
145 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
146 * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
147 * mode -- there must be no spaces between its arguments, and for nested
148 * __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also
149 * concatenate double-quoted strings produced by the __STRING macro, but
150 * this only works with ANSI C.
152 * __XSTRING is like __STRING, but it expands any macros in its argument
153 * first. It is only available with ANSI C.
155 #if defined(__STDC__) || defined(__cplusplus)
156 #define __P(protos) protos /* full-blown ANSI C */
157 #define __CONCAT1(x,y) x ## y
158 #define __CONCAT(x,y) __CONCAT1(x,y)
159 #define __STRING(x) #x /* stringify without expanding x */
160 #define __XSTRING(x) __STRING(x) /* expand x, then stringify */
162 #define __const const /* define reserved names to standard */
163 #define __signed signed
164 #define __volatile volatile
165 #if defined(__cplusplus)
166 #define __inline inline /* convert to C++ keyword */
168 #if !(defined(__CC_SUPPORTS___INLINE))
169 #define __inline /* delete GCC keyword */
170 #endif /* ! __CC_SUPPORTS___INLINE */
171 #endif /* !__cplusplus */
173 #else /* !(__STDC__ || __cplusplus) */
174 #define __P(protos) () /* traditional C preprocessor */
175 #define __CONCAT(x,y) x/**/y
176 #define __STRING(x) "x"
178 #if !defined(__CC_SUPPORTS___INLINE)
179 #define __const /* delete pseudo-ANSI C keywords */
184 * In non-ANSI C environments, new programs will want ANSI-only C keywords
185 * deleted from the program and old programs will want them left alone.
186 * When using a compiler other than gcc, programs using the ANSI C keywords
187 * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
188 * When using "gcc -traditional", we assume that this is the intent; if
189 * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
191 #ifndef NO_ANSI_KEYWORDS
192 #define const /* delete ANSI C keywords */
196 #endif /* !NO_ANSI_KEYWORDS */
197 #endif /* !__CC_SUPPORTS___INLINE */
198 #endif /* !(__STDC__ || __cplusplus) */
201 * Compiler-dependent macros to help declare dead (non-returning) and
202 * pure (no side effects) functions, and unused variables. They are
203 * null except for versions of gcc that are known to support the features
204 * properly (old versions of gcc-2 supported the dead and pure features
205 * in a different (wrong) way). If we do not provide an implementation
206 * for a given compiler, let the compile fail if it is told to use
207 * a feature that we cannot live without.
216 #define __weak_symbol
218 #define __weak_symbol __attribute__((__weak__))
219 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
224 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
225 #define __dead2 __attribute__((__noreturn__))
226 #define __pure2 __attribute__((__const__))
228 /* XXX Find out what to do for __packed, __aligned and __section */
230 #if __GNUC_PREREQ__(2, 7)
231 #define __dead2 __attribute__((__noreturn__))
232 #define __pure2 __attribute__((__const__))
233 #define __unused __attribute__((__unused__))
234 #define __used __attribute__((__used__))
235 #define __packed __attribute__((__packed__))
236 #define __aligned(x) __attribute__((__aligned__(x)))
237 #define __section(x) __attribute__((__section__(x)))
239 #if defined(__INTEL_COMPILER)
240 #define __dead2 __attribute__((__noreturn__))
241 #define __pure2 __attribute__((__const__))
242 #define __unused __attribute__((__unused__))
243 #define __used __attribute__((__used__))
244 #define __packed __attribute__((__packed__))
245 #define __aligned(x) __attribute__((__aligned__(x)))
246 #define __section(x) __attribute__((__section__(x)))
250 #if !__GNUC_PREREQ__(2, 95)
251 #define __alignof(x) __offsetof(struct { char __a; x __b; }, __b)
255 * Keywords added in C11.
258 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L || defined(lint)
260 #if !__has_extension(c_alignas)
261 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
262 __has_extension(cxx_alignas)
263 #define _Alignas(x) alignas(x)
265 /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */
266 #define _Alignas(x) __aligned(x)
270 #if defined(__cplusplus) && __cplusplus >= 201103L
271 #define _Alignof(x) alignof(x)
273 #define _Alignof(x) __alignof(x)
276 #if !__has_extension(c_atomic) && !__has_extension(cxx_atomic)
278 * No native support for _Atomic(). Place object in structure to prevent
279 * most forms of direct non-atomic access.
281 #define _Atomic(T) struct { T volatile __val; }
284 #if defined(__cplusplus) && __cplusplus >= 201103L
285 #define _Noreturn [[noreturn]]
287 #define _Noreturn __dead2
290 #if !__has_extension(c_static_assert)
291 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
292 __has_extension(cxx_static_assert)
293 #define _Static_assert(x, y) static_assert(x, y)
294 #elif __GNUC_PREREQ__(4,6)
295 /* Nothing, gcc 4.6 and higher has _Static_assert built-in */
296 #elif defined(__COUNTER__)
297 #define _Static_assert(x, y) __Static_assert(x, __COUNTER__)
298 #define __Static_assert(x, y) ___Static_assert(x, y)
299 #define ___Static_assert(x, y) typedef char __assert_ ## y[(x) ? 1 : -1] \
302 #define _Static_assert(x, y) struct __hack
306 #if !__has_extension(c_thread_local)
308 * XXX: Some compilers (Clang 3.3, GCC 4.7) falsely announce C++11 mode
309 * without actually supporting the thread_local keyword. Don't check for
310 * the presence of C++11 when defining _Thread_local.
312 #if /* (defined(__cplusplus) && __cplusplus >= 201103L) || */ \
313 __has_extension(cxx_thread_local)
314 #define _Thread_local thread_local
316 #define _Thread_local __thread
320 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
323 * Emulation of C11 _Generic(). Unlike the previously defined C11
324 * keywords, it is not possible to implement this using exactly the same
325 * syntax. Therefore implement something similar under the name
326 * __generic(). Unlike _Generic(), this macro can only distinguish
327 * between a single type, so it requires nested invocations to
328 * distinguish multiple cases.
331 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
332 __has_extension(c_generic_selections)
333 #define __generic(expr, t, yes, no) \
334 _Generic(expr, t: yes, default: no)
335 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
336 #define __generic(expr, t, yes, no) \
337 __builtin_choose_expr( \
338 __builtin_types_compatible_p(__typeof(expr), t), yes, no)
341 #if __GNUC_PREREQ__(2, 96)
342 #define __malloc_like __attribute__((__malloc__))
343 #define __pure __attribute__((__pure__))
345 #define __malloc_like
349 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
350 #define __always_inline __attribute__((__always_inline__))
352 #define __always_inline
355 #if __GNUC_PREREQ__(3, 1)
356 #define __noinline __attribute__ ((__noinline__))
361 #if __GNUC_PREREQ__(3, 3)
362 #define __nonnull(x) __attribute__((__nonnull__(x)))
363 #define __nonnull_all __attribute__((__nonnull__))
366 #define __nonnull_all
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 __has_attribute(alloc_size) || __GNUC_PREREQ__(4, 3)
384 #define __alloc_size(x) __attribute__((__alloc_size__(x)))
386 #define __alloc_size(x)
389 #if __has_builtin(__builtin_unreachable) || __GNUC_PREREQ__(4, 6)
390 #define __unreachable() __builtin_unreachable()
392 #define __unreachable() ((void)0)
395 #if __has_attribute(alloc_align) || __GNUC_PREREQ__(4, 9)
396 #define __alloc_align(x) __attribute__((__alloc_align__(x)))
398 #define __alloc_align(x)
401 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
402 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
403 #define __func__ NULL
406 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
407 #define __LONG_LONG_SUPPORTED
410 /* C++11 exposes a load of C99 stuff */
411 #if defined(__cplusplus) && __cplusplus >= 201103L
412 #define __LONG_LONG_SUPPORTED
413 #ifndef __STDC_LIMIT_MACROS
414 #define __STDC_LIMIT_MACROS
416 #ifndef __STDC_CONSTANT_MACROS
417 #define __STDC_CONSTANT_MACROS
422 * GCC 2.95 provides `__restrict' as an extension to C90 to support the
423 * C99-specific `restrict' type qualifier. We happen to use `__restrict' as
424 * a way to define the `restrict' type qualifier without disturbing older
425 * software that is unaware of C99 keywords.
427 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
428 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
431 #define __restrict restrict
436 * GNU C version 2.96 adds explicit branch prediction so that
437 * the CPU back-end can hint the processor and also so that
438 * code blocks can be reordered such that the predicted path
439 * sees a more linear flow, thus improving cache behavior, etc.
441 * The following two macros provide us with a way to utilize this
442 * compiler feature. Use __predict_true() if you expect the expression
443 * to evaluate to true, and __predict_false() if you expect the
444 * expression to evaluate to false.
446 * A few notes about usage:
448 * * Generally, __predict_false() error condition checks (unless
449 * you have some _strong_ reason to do otherwise, in which case
450 * document it), and/or __predict_true() `no-error' condition
451 * checks, assuming you want to optimize for the no-error case.
453 * * Other than that, if you don't know the likelihood of a test
454 * succeeding from empirical or other `hard' evidence, don't
457 * * These are meant to be used in places that are run `a lot'.
458 * It is wasteful to make predictions in code that is run
459 * seldomly (e.g. at subsystem initialization time) as the
460 * basic block reordering that this affects can often generate
463 #if __GNUC_PREREQ__(2, 96)
464 #define __predict_true(exp) __builtin_expect((exp), 1)
465 #define __predict_false(exp) __builtin_expect((exp), 0)
467 #define __predict_true(exp) (exp)
468 #define __predict_false(exp) (exp)
471 #if __GNUC_PREREQ__(4, 0)
472 #define __sentinel __attribute__((__sentinel__))
473 #define __exported __attribute__((__visibility__("default")))
474 #define __hidden __attribute__((__visibility__("hidden")))
482 * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
485 #if __GNUC_PREREQ__(4, 1)
486 #define __offsetof(type, field) __builtin_offsetof(type, field)
489 #define __offsetof(type, field) \
490 ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
492 #define __offsetof(type, field) \
493 (__offsetof__ (reinterpret_cast <__size_t> \
494 (&reinterpret_cast <const volatile char &> \
495 (static_cast<type *> (0)->field))))
498 #define __rangeof(type, start, end) \
499 (__offsetof(type, end) - __offsetof(type, start))
502 * Given the pointer x to the member m of the struct s, return
503 * a pointer to the containing structure. When using GCC, we first
504 * assign pointer x to a local variable, to check that its type is
505 * compatible with member m.
507 #if __GNUC_PREREQ__(3, 1)
508 #define __containerof(x, s, m) ({ \
509 const volatile __typeof(((s *)0)->m) *__x = (x); \
510 __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
513 #define __containerof(x, s, m) \
514 __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
518 * Compiler-dependent macros to declare that functions take printf-like
519 * or scanf-like arguments. They are null except for versions of gcc
520 * that are known to support the features properly (old versions of gcc-2
521 * didn't permit keeping the keywords out of the application namespace).
523 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
524 #define __printflike(fmtarg, firstvararg)
525 #define __scanflike(fmtarg, firstvararg)
526 #define __format_arg(fmtarg)
527 #define __strfmonlike(fmtarg, firstvararg)
528 #define __strftimelike(fmtarg, firstvararg)
530 #define __printflike(fmtarg, firstvararg) \
531 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
532 #define __scanflike(fmtarg, firstvararg) \
533 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
534 #define __format_arg(fmtarg) __attribute__((__format_arg__ (fmtarg)))
535 #define __strfmonlike(fmtarg, firstvararg) \
536 __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
537 #define __strftimelike(fmtarg, firstvararg) \
538 __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
542 * FORTIFY_SOURCE, and perhaps other compiler-specific features, require
543 * the use of non-standard inlining. In general we should try to avoid
544 * using these but GCC-compatible compilers tend to support the extensions
545 * well enough to use them in limited cases.
547 #if defined(__GNUC_GNU_INLINE__) || defined(__GNUC_STDC_INLINE__)
548 #if __has_attribute(artificial) || __GNUC_PREREQ__(4, 3)
549 #define __gnu_inline __attribute__((__gnu_inline__, __artificial__))
551 #define __gnu_inline __attribute__((__gnu_inline__))
552 #endif /* artificial */
557 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
558 #if defined(__FreeBSD_cc_version) && __FreeBSD_cc_version >= 300001 && \
559 defined(__GNUC__) && !defined(__INTEL_COMPILER)
560 #define __printf0like(fmtarg, firstvararg) \
561 __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
563 #define __printf0like(fmtarg, firstvararg)
566 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
567 #ifndef __INTEL_COMPILER
568 #define __strong_reference(sym,aliassym) \
569 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
572 #define __weak_reference(sym,alias) \
573 __asm__(".weak " #alias); \
574 __asm__(".equ " #alias ", " #sym)
575 #define __warn_references(sym,msg) \
576 __asm__(".section .gnu.warning." #sym); \
577 __asm__(".asciz \"" msg "\""); \
579 #define __sym_compat(sym,impl,verid) \
580 __asm__(".symver " #impl ", " #sym "@" #verid)
581 #define __sym_default(sym,impl,verid) \
582 __asm__(".symver " #impl ", " #sym "@@" #verid)
584 #define __weak_reference(sym,alias) \
585 __asm__(".weak alias"); \
586 __asm__(".equ alias, sym")
587 #define __warn_references(sym,msg) \
588 __asm__(".section .gnu.warning.sym"); \
589 __asm__(".asciz \"msg\""); \
591 #define __sym_compat(sym,impl,verid) \
592 __asm__(".symver impl, sym@verid")
593 #define __sym_default(impl,sym,verid) \
594 __asm__(".symver impl, sym@@verid")
595 #endif /* __STDC__ */
596 #endif /* __GNUC__ || __INTEL_COMPILER */
598 #define __GLOBL1(sym) __asm__(".globl " #sym)
599 #define __GLOBL(sym) __GLOBL1(sym)
601 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
602 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
605 * The following definition might not work well if used in header files,
606 * but it should be better than nothing. If you want a "do nothing"
607 * version, then it should generate some harmless declaration, such as:
608 * #define __IDSTRING(name,string) struct __hack
610 #define __IDSTRING(name,string) static const char name[] __unused = string
614 * Embed the rcs id of a source file in the resulting library. Note that in
615 * more recent ELF binutils, we use .ident allowing the ID to be stripped.
617 * __FBSDID("$FreeBSD$");
620 #if !defined(lint) && !defined(STRIP_FBSDID)
621 #define __FBSDID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
623 #define __FBSDID(s) struct __hack
629 #define __RCSID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
631 #define __RCSID(s) struct __hack
635 #ifndef __RCSID_SOURCE
636 #ifndef NO__RCSID_SOURCE
637 #define __RCSID_SOURCE(s) __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
639 #define __RCSID_SOURCE(s) struct __hack
645 #define __SCCSID(s) __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
647 #define __SCCSID(s) struct __hack
652 #ifndef NO__COPYRIGHT
653 #define __COPYRIGHT(s) __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
655 #define __COPYRIGHT(s) struct __hack
660 #define __DECONST(type, var) ((type)(__uintptr_t)(const void *)(var))
664 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
668 #define __DEQUALIFY(type, var) ((type)(__uintptr_t)(const volatile void *)(var))
672 * The following definitions are an extension of the behavior originally
673 * implemented in <sys/_posix.h>, but with a different level of granularity.
674 * POSIX.1 requires that the macros we test be defined before any standard
675 * header file is included.
677 * Here's a quick run-down of the versions:
678 * defined(_POSIX_SOURCE) 1003.1-1988
679 * _POSIX_C_SOURCE == 1 1003.1-1990
680 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option
681 * _POSIX_C_SOURCE == 199309 1003.1b-1993
682 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995,
683 * and the omnibus ISO/IEC 9945-1: 1996
684 * _POSIX_C_SOURCE == 200112 1003.1-2001
685 * _POSIX_C_SOURCE == 200809 1003.1-2008
687 * In addition, the X/Open Portability Guide, which is now the Single UNIX
688 * Specification, defines a feature-test macro which indicates the version of
689 * that specification, and which subsumes _POSIX_C_SOURCE.
691 * Our macros begin with two underscores to avoid namespace screwage.
694 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
695 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
696 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
697 #define _POSIX_C_SOURCE 199009
700 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
701 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
702 #undef _POSIX_C_SOURCE
703 #define _POSIX_C_SOURCE 199209
706 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
708 #if _XOPEN_SOURCE - 0 >= 700
709 #define __XSI_VISIBLE 700
710 #undef _POSIX_C_SOURCE
711 #define _POSIX_C_SOURCE 200809
712 #elif _XOPEN_SOURCE - 0 >= 600
713 #define __XSI_VISIBLE 600
714 #undef _POSIX_C_SOURCE
715 #define _POSIX_C_SOURCE 200112
716 #elif _XOPEN_SOURCE - 0 >= 500
717 #define __XSI_VISIBLE 500
718 #undef _POSIX_C_SOURCE
719 #define _POSIX_C_SOURCE 199506
724 * Deal with all versions of POSIX. The ordering relative to the tests above is
727 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
728 #define _POSIX_C_SOURCE 198808
730 #ifdef _POSIX_C_SOURCE
731 #if _POSIX_C_SOURCE >= 200809
732 #define __POSIX_VISIBLE 200809
733 #define __ISO_C_VISIBLE 1999
734 #elif _POSIX_C_SOURCE >= 200112
735 #define __POSIX_VISIBLE 200112
736 #define __ISO_C_VISIBLE 1999
737 #elif _POSIX_C_SOURCE >= 199506
738 #define __POSIX_VISIBLE 199506
739 #define __ISO_C_VISIBLE 1990
740 #elif _POSIX_C_SOURCE >= 199309
741 #define __POSIX_VISIBLE 199309
742 #define __ISO_C_VISIBLE 1990
743 #elif _POSIX_C_SOURCE >= 199209
744 #define __POSIX_VISIBLE 199209
745 #define __ISO_C_VISIBLE 1990
746 #elif _POSIX_C_SOURCE >= 199009
747 #define __POSIX_VISIBLE 199009
748 #define __ISO_C_VISIBLE 1990
750 #define __POSIX_VISIBLE 198808
751 #define __ISO_C_VISIBLE 0
752 #endif /* _POSIX_C_SOURCE */
755 * Deal with _ANSI_SOURCE:
756 * If it is defined, and no other compilation environment is explicitly
757 * requested, then define our internal feature-test macros to zero. This
758 * makes no difference to the preprocessor (undefined symbols in preprocessing
759 * expressions are defined to have value zero), but makes it more convenient for
760 * a test program to print out the values.
762 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
763 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
764 * environment (and in fact we will never get here).
766 #if defined(_ANSI_SOURCE) /* Hide almost everything. */
767 #define __POSIX_VISIBLE 0
768 #define __XSI_VISIBLE 0
769 #define __BSD_VISIBLE 0
770 #define __ISO_C_VISIBLE 1990
771 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
772 #define __POSIX_VISIBLE 0
773 #define __XSI_VISIBLE 0
774 #define __BSD_VISIBLE 0
775 #define __ISO_C_VISIBLE 1999
776 #elif defined(_C11_SOURCE) /* Localism to specify strict C11 env. */
777 #define __POSIX_VISIBLE 0
778 #define __XSI_VISIBLE 0
779 #define __BSD_VISIBLE 0
780 #define __ISO_C_VISIBLE 2011
781 #else /* Default environment: show everything. */
782 #define __POSIX_VISIBLE 200809
783 #define __XSI_VISIBLE 700
784 #define __BSD_VISIBLE 1
785 #define __ISO_C_VISIBLE 2011
789 #if defined(__mips) || defined(__powerpc64__)
794 * Type Safety Checking
796 * Clang provides additional attributes to enable checking type safety
797 * properties that cannot be enforced by the C type system.
800 #if __has_attribute(argument_with_type_tag) && \
801 __has_attribute(type_tag_for_datatype) && !defined(lint)
802 #define __arg_type_tag(arg_kind, arg_idx, type_tag_idx) \
803 __attribute__((__argument_with_type_tag__(arg_kind, arg_idx, type_tag_idx)))
804 #define __datatype_type_tag(kind, type) \
805 __attribute__((__type_tag_for_datatype__(kind, type)))
807 #define __arg_type_tag(arg_kind, arg_idx, type_tag_idx)
808 #define __datatype_type_tag(kind, type)
814 * Clang provides support for doing basic thread-safety tests at
815 * compile-time, by marking which locks will/should be held when
816 * entering/leaving a functions.
818 * Furthermore, it is also possible to annotate variables and structure
819 * members to enforce that they are only accessed when certain locks are
823 #if __has_extension(c_thread_safety_attributes)
824 #define __lock_annotate(x) __attribute__((x))
826 #define __lock_annotate(x)
829 /* Structure implements a lock. */
830 #define __lockable __lock_annotate(lockable)
832 /* Function acquires an exclusive or shared lock. */
833 #define __locks_exclusive(...) \
834 __lock_annotate(exclusive_lock_function(__VA_ARGS__))
835 #define __locks_shared(...) \
836 __lock_annotate(shared_lock_function(__VA_ARGS__))
838 /* Function attempts to acquire an exclusive or shared lock. */
839 #define __trylocks_exclusive(...) \
840 __lock_annotate(exclusive_trylock_function(__VA_ARGS__))
841 #define __trylocks_shared(...) \
842 __lock_annotate(shared_trylock_function(__VA_ARGS__))
844 /* Function releases a lock. */
845 #define __unlocks(...) __lock_annotate(unlock_function(__VA_ARGS__))
847 /* Function asserts that an exclusive or shared lock is held. */
848 #define __asserts_exclusive(...) \
849 __lock_annotate(assert_exclusive_lock(__VA_ARGS__))
850 #define __asserts_shared(...) \
851 __lock_annotate(assert_shared_lock(__VA_ARGS__))
853 /* Function requires that an exclusive or shared lock is or is not held. */
854 #define __requires_exclusive(...) \
855 __lock_annotate(exclusive_locks_required(__VA_ARGS__))
856 #define __requires_shared(...) \
857 __lock_annotate(shared_locks_required(__VA_ARGS__))
858 #define __requires_unlocked(...) \
859 __lock_annotate(locks_excluded(__VA_ARGS__))
861 /* Function should not be analyzed. */
862 #define __no_lock_analysis __lock_annotate(no_thread_safety_analysis)
864 /* Guard variables and structure members by lock. */
865 #define __guarded_by(x) __lock_annotate(guarded_by(x))
866 #define __pt_guarded_by(x) __lock_annotate(pt_guarded_by(x))
868 #endif /* !_SYS_CDEFS_H_ */