The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/sys/cdefs.h

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    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/10.2/sys/sys/cdefs.h 284948 2015-06-30 08:40:15Z tijl $
   34  */
   35 
   36 #ifndef _SYS_CDEFS_H_
   37 #define _SYS_CDEFS_H_
   38 
   39 /*
   40  * Testing against Clang-specific extensions.
   41  */
   42 
   43 #ifndef __has_attribute
   44 #define __has_attribute(x)      0
   45 #endif
   46 #ifndef __has_extension
   47 #define __has_extension         __has_feature
   48 #endif
   49 #ifndef __has_feature
   50 #define __has_feature(x)        0
   51 #endif
   52 #ifndef __has_include
   53 #define __has_include(x)        0
   54 #endif
   55 #ifndef __has_builtin
   56 #define __has_builtin(x)        0
   57 #endif
   58 
   59 #if defined(__cplusplus)
   60 #define __BEGIN_DECLS   extern "C" {
   61 #define __END_DECLS     }
   62 #else
   63 #define __BEGIN_DECLS
   64 #define __END_DECLS
   65 #endif
   66 
   67 /*
   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.
   71  */
   72 
   73 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
   74 
   75 #if __GNUC__ >= 3 || defined(__INTEL_COMPILER)
   76 #define __GNUCLIKE_ASM 3
   77 #define __GNUCLIKE_MATH_BUILTIN_CONSTANTS
   78 #else
   79 #define __GNUCLIKE_ASM 2
   80 #endif
   81 #define __GNUCLIKE___TYPEOF 1
   82 #define __GNUCLIKE___OFFSETOF 1
   83 #define __GNUCLIKE___SECTION 1
   84 
   85 #ifndef __INTEL_COMPILER
   86 # define __GNUCLIKE_CTOR_SECTION_HANDLING 1
   87 #endif
   88 
   89 #define __GNUCLIKE_BUILTIN_CONSTANT_P 1
   90 # if defined(__INTEL_COMPILER) && defined(__cplusplus) \
   91     && __INTEL_COMPILER < 800
   92 #  undef __GNUCLIKE_BUILTIN_CONSTANT_P
   93 # endif
   94 
   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
   99 #endif
  100 
  101 #if defined(__GNUC__)
  102 # define __GNUC_VA_LIST_COMPATIBILITY 1
  103 #endif
  104 
  105 /*
  106  * Compiler memory barriers, specific to gcc and clang.
  107  */
  108 #if defined(__GNUC__)
  109 #define __compiler_membar()     __asm __volatile(" " : : : "memory")
  110 #endif
  111 
  112 #ifndef __INTEL_COMPILER
  113 # define __GNUCLIKE_BUILTIN_NEXT_ARG 1
  114 # define __GNUCLIKE_MATH_BUILTIN_RELOPS
  115 #endif
  116 
  117 #define __GNUCLIKE_BUILTIN_MEMCPY 1
  118 
  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
  123 
  124 #define __CC_SUPPORTS___FUNC__ 1
  125 #define __CC_SUPPORTS_WARNING 1
  126 
  127 #define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
  128 
  129 #define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
  130 
  131 #endif /* __GNUC__ || __INTEL_COMPILER */
  132 
  133 /*
  134  * Macro to test if we're using a specific version of gcc or later.
  135  */
  136 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
  137 #define __GNUC_PREREQ__(ma, mi) \
  138         (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
  139 #else
  140 #define __GNUC_PREREQ__(ma, mi) 0
  141 #endif
  142 
  143 /*
  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.
  151  *
  152  * __XSTRING is like __STRING, but it expands any macros in its argument
  153  * first.  It is only available with ANSI C.
  154  */
  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 */
  161 
  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 */
  167 #else
  168 #if !(defined(__CC_SUPPORTS___INLINE))
  169 #define __inline                        /* delete GCC keyword */
  170 #endif /* ! __CC_SUPPORTS___INLINE */
  171 #endif /* !__cplusplus */
  172 
  173 #else   /* !(__STDC__ || __cplusplus) */
  174 #define __P(protos)     ()              /* traditional C preprocessor */
  175 #define __CONCAT(x,y)   x/**/y
  176 #define __STRING(x)     "x"
  177 
  178 #if !defined(__CC_SUPPORTS___INLINE)
  179 #define __const                         /* delete pseudo-ANSI C keywords */
  180 #define __inline
  181 #define __signed
  182 #define __volatile
  183 /*
  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.
  190  */
  191 #ifndef NO_ANSI_KEYWORDS
  192 #define const                           /* delete ANSI C keywords */
  193 #define inline
  194 #define signed
  195 #define volatile
  196 #endif  /* !NO_ANSI_KEYWORDS */
  197 #endif  /* !__CC_SUPPORTS___INLINE */
  198 #endif  /* !(__STDC__ || __cplusplus) */
  199 
  200 /*
  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.
  208  */
  209 #ifdef lint
  210 #define __dead2
  211 #define __pure2
  212 #define __unused
  213 #define __packed
  214 #define __aligned(x)
  215 #define __section(x)
  216 #define __weak_symbol
  217 #else
  218 #define __weak_symbol   __attribute__((__weak__))
  219 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
  220 #define __dead2
  221 #define __pure2
  222 #define __unused
  223 #endif
  224 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
  225 #define __dead2         __attribute__((__noreturn__))
  226 #define __pure2         __attribute__((__const__))
  227 #define __unused
  228 /* XXX Find out what to do for __packed, __aligned and __section */
  229 #endif
  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)))
  238 #endif
  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)))
  247 #endif
  248 #endif /* lint */
  249 
  250 #if !__GNUC_PREREQ__(2, 95)
  251 #define __alignof(x)    __offsetof(struct { char __a; x __b; }, __b)
  252 #endif
  253 
  254 /*
  255  * Keywords added in C11.
  256  */
  257 
  258 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L || defined(lint)
  259 
  260 #if !__has_extension(c_alignas)
  261 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
  262     __has_extension(cxx_alignas)
  263 #define _Alignas(x)             alignas(x)
  264 #else
  265 /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */
  266 #define _Alignas(x)             __aligned(x)
  267 #endif
  268 #endif
  269 
  270 #if defined(__cplusplus) && __cplusplus >= 201103L
  271 #define _Alignof(x)             alignof(x)
  272 #else
  273 #define _Alignof(x)             __alignof(x)
  274 #endif
  275 
  276 #if !__has_extension(c_atomic) && !__has_extension(cxx_atomic)
  277 /*
  278  * No native support for _Atomic(). Place object in structure to prevent
  279  * most forms of direct non-atomic access.
  280  */
  281 #define _Atomic(T)              struct { T volatile __val; }
  282 #endif
  283 
  284 #if defined(__cplusplus) && __cplusplus >= 201103L
  285 #define _Noreturn               [[noreturn]]
  286 #else
  287 #define _Noreturn               __dead2
  288 #endif
  289 
  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 defined(__COUNTER__)
  295 #define _Static_assert(x, y)    __Static_assert(x, __COUNTER__)
  296 #define __Static_assert(x, y)   ___Static_assert(x, y)
  297 #define ___Static_assert(x, y)  typedef char __assert_ ## y[(x) ? 1 : -1] \
  298                                 __unused
  299 #else
  300 #define _Static_assert(x, y)    struct __hack
  301 #endif
  302 #endif
  303 
  304 #if !__has_extension(c_thread_local)
  305 /* XXX: Change this to test against C++11 when clang in base supports it. */
  306 #if /* (defined(__cplusplus) && __cplusplus >= 201103L) || */ \
  307     __has_extension(cxx_thread_local)
  308 #define _Thread_local           thread_local
  309 #else
  310 #define _Thread_local           __thread
  311 #endif
  312 #endif
  313 
  314 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
  315 
  316 /*
  317  * Emulation of C11 _Generic().  Unlike the previously defined C11
  318  * keywords, it is not possible to implement this using exactly the same
  319  * syntax.  Therefore implement something similar under the name
  320  * __generic().  Unlike _Generic(), this macro can only distinguish
  321  * between a single type, so it requires nested invocations to
  322  * distinguish multiple cases.
  323  */
  324 
  325 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
  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)
  332 #endif
  333 
  334 #if __GNUC_PREREQ__(2, 96)
  335 #define __malloc_like   __attribute__((__malloc__))
  336 #define __pure          __attribute__((__pure__))
  337 #else
  338 #define __malloc_like
  339 #define __pure
  340 #endif
  341 
  342 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
  343 #define __always_inline __attribute__((__always_inline__))
  344 #else
  345 #define __always_inline
  346 #endif
  347 
  348 #if __GNUC_PREREQ__(3, 1)
  349 #define __noinline      __attribute__ ((__noinline__))
  350 #else
  351 #define __noinline
  352 #endif
  353 
  354 #if __GNUC_PREREQ__(3, 3)
  355 #define __nonnull(x)    __attribute__((__nonnull__(x)))
  356 #else
  357 #define __nonnull(x)
  358 #endif
  359 
  360 #if __GNUC_PREREQ__(3, 4)
  361 #define __fastcall      __attribute__((__fastcall__))
  362 #define __result_use_check      __attribute__((__warn_unused_result__))
  363 #else
  364 #define __fastcall
  365 #define __result_use_check
  366 #endif
  367 
  368 #if __GNUC_PREREQ__(4, 1)
  369 #define __returns_twice __attribute__((__returns_twice__))
  370 #else
  371 #define __returns_twice
  372 #endif
  373 
  374 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
  375 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  376 #define __func__        NULL
  377 #endif
  378 
  379 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
  380 #define __LONG_LONG_SUPPORTED
  381 #endif
  382 
  383 /* C++11 exposes a load of C99 stuff */
  384 #if defined(__cplusplus) && __cplusplus >= 201103L
  385 #define __LONG_LONG_SUPPORTED
  386 #ifndef __STDC_LIMIT_MACROS
  387 #define __STDC_LIMIT_MACROS
  388 #endif
  389 #ifndef __STDC_CONSTANT_MACROS
  390 #define __STDC_CONSTANT_MACROS
  391 #endif
  392 #endif
  393 
  394 /*
  395  * GCC 2.95 provides `__restrict' as an extension to C90 to support the
  396  * C99-specific `restrict' type qualifier.  We happen to use `__restrict' as
  397  * a way to define the `restrict' type qualifier without disturbing older
  398  * software that is unaware of C99 keywords.
  399  */
  400 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
  401 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
  402 #define __restrict
  403 #else
  404 #define __restrict      restrict
  405 #endif
  406 #endif
  407 
  408 /*
  409  * GNU C version 2.96 adds explicit branch prediction so that
  410  * the CPU back-end can hint the processor and also so that
  411  * code blocks can be reordered such that the predicted path
  412  * sees a more linear flow, thus improving cache behavior, etc.
  413  *
  414  * The following two macros provide us with a way to utilize this
  415  * compiler feature.  Use __predict_true() if you expect the expression
  416  * to evaluate to true, and __predict_false() if you expect the
  417  * expression to evaluate to false.
  418  *
  419  * A few notes about usage:
  420  *
  421  *      * Generally, __predict_false() error condition checks (unless
  422  *        you have some _strong_ reason to do otherwise, in which case
  423  *        document it), and/or __predict_true() `no-error' condition
  424  *        checks, assuming you want to optimize for the no-error case.
  425  *
  426  *      * Other than that, if you don't know the likelihood of a test
  427  *        succeeding from empirical or other `hard' evidence, don't
  428  *        make predictions.
  429  *
  430  *      * These are meant to be used in places that are run `a lot'.
  431  *        It is wasteful to make predictions in code that is run
  432  *        seldomly (e.g. at subsystem initialization time) as the
  433  *        basic block reordering that this affects can often generate
  434  *        larger code.
  435  */
  436 #if __GNUC_PREREQ__(2, 96)
  437 #define __predict_true(exp)     __builtin_expect((exp), 1)
  438 #define __predict_false(exp)    __builtin_expect((exp), 0)
  439 #else
  440 #define __predict_true(exp)     (exp)
  441 #define __predict_false(exp)    (exp)
  442 #endif
  443 
  444 #if __GNUC_PREREQ__(4, 0)
  445 #define __hidden        __attribute__((__visibility__("hidden")))
  446 #define __exported      __attribute__((__visibility__("default")))
  447 #else
  448 #define __hidden
  449 #define __exported
  450 #endif
  451 
  452 /*
  453  * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
  454  * require it.
  455  */
  456 #if __GNUC_PREREQ__(4, 1)
  457 #define __offsetof(type, field)  __builtin_offsetof(type, field)
  458 #else
  459 #ifndef __cplusplus
  460 #define __offsetof(type, field) \
  461         ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
  462 #else
  463 #define __offsetof(type, field)                                 \
  464   (__offsetof__ (reinterpret_cast <__size_t>                    \
  465                  (&reinterpret_cast <const volatile char &>     \
  466                   (static_cast<type *> (0)->field))))
  467 #endif
  468 #endif
  469 #define __rangeof(type, start, end) \
  470         (__offsetof(type, end) - __offsetof(type, start))
  471 
  472 /*
  473  * Given the pointer x to the member m of the struct s, return
  474  * a pointer to the containing structure.  When using GCC, we first
  475  * assign pointer x to a local variable, to check that its type is
  476  * compatible with member m.
  477  */
  478 #if __GNUC_PREREQ__(3, 1)
  479 #define __containerof(x, s, m) ({                                       \
  480         const volatile __typeof(((s *)0)->m) *__x = (x);                \
  481         __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
  482 })
  483 #else
  484 #define __containerof(x, s, m)                                          \
  485         __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
  486 #endif
  487 
  488 /*
  489  * Compiler-dependent macros to declare that functions take printf-like
  490  * or scanf-like arguments.  They are null except for versions of gcc
  491  * that are known to support the features properly (old versions of gcc-2
  492  * didn't permit keeping the keywords out of the application namespace).
  493  */
  494 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  495 #define __printflike(fmtarg, firstvararg)
  496 #define __scanflike(fmtarg, firstvararg)
  497 #define __format_arg(fmtarg)
  498 #define __strfmonlike(fmtarg, firstvararg)
  499 #define __strftimelike(fmtarg, firstvararg)
  500 #else
  501 #define __printflike(fmtarg, firstvararg) \
  502             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
  503 #define __scanflike(fmtarg, firstvararg) \
  504             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
  505 #define __format_arg(fmtarg)    __attribute__((__format_arg__ (fmtarg)))
  506 #define __strfmonlike(fmtarg, firstvararg) \
  507             __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
  508 #define __strftimelike(fmtarg, firstvararg) \
  509             __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
  510 #endif
  511 
  512 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
  513 #if defined(__FreeBSD_cc_version) && __FreeBSD_cc_version >= 300001 && \
  514     defined(__GNUC__) && !defined(__INTEL_COMPILER)
  515 #define __printf0like(fmtarg, firstvararg) \
  516             __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
  517 #else
  518 #define __printf0like(fmtarg, firstvararg)
  519 #endif
  520 
  521 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  522 #ifndef __INTEL_COMPILER
  523 #define __strong_reference(sym,aliassym)        \
  524         extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
  525 #endif
  526 #ifdef __STDC__
  527 #define __weak_reference(sym,alias)     \
  528         __asm__(".weak " #alias);       \
  529         __asm__(".equ "  #alias ", " #sym)
  530 #define __warn_references(sym,msg)      \
  531         __asm__(".section .gnu.warning." #sym); \
  532         __asm__(".asciz \"" msg "\"");  \
  533         __asm__(".previous")
  534 #define __sym_compat(sym,impl,verid)    \
  535         __asm__(".symver " #impl ", " #sym "@" #verid)
  536 #define __sym_default(sym,impl,verid)   \
  537         __asm__(".symver " #impl ", " #sym "@@" #verid)
  538 #else
  539 #define __weak_reference(sym,alias)     \
  540         __asm__(".weak alias");         \
  541         __asm__(".equ alias, sym")
  542 #define __warn_references(sym,msg)      \
  543         __asm__(".section .gnu.warning.sym"); \
  544         __asm__(".asciz \"msg\"");      \
  545         __asm__(".previous")
  546 #define __sym_compat(sym,impl,verid)    \
  547         __asm__(".symver impl, sym@verid")
  548 #define __sym_default(impl,sym,verid)   \
  549         __asm__(".symver impl, sym@@verid")
  550 #endif  /* __STDC__ */
  551 #endif  /* __GNUC__ || __INTEL_COMPILER */
  552 
  553 #define __GLOBL1(sym)   __asm__(".globl " #sym)
  554 #define __GLOBL(sym)    __GLOBL1(sym)
  555 
  556 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  557 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
  558 #else
  559 /*
  560  * The following definition might not work well if used in header files,
  561  * but it should be better than nothing.  If you want a "do nothing"
  562  * version, then it should generate some harmless declaration, such as:
  563  *    #define __IDSTRING(name,string)   struct __hack
  564  */
  565 #define __IDSTRING(name,string) static const char name[] __unused = string
  566 #endif
  567 
  568 /*
  569  * Embed the rcs id of a source file in the resulting library.  Note that in
  570  * more recent ELF binutils, we use .ident allowing the ID to be stripped.
  571  * Usage:
  572  *      __FBSDID("$FreeBSD: releng/10.2/sys/sys/cdefs.h 284948 2015-06-30 08:40:15Z tijl $");
  573  */
  574 #ifndef __FBSDID
  575 #if !defined(lint) && !defined(STRIP_FBSDID)
  576 #define __FBSDID(s)     __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  577 #else
  578 #define __FBSDID(s)     struct __hack
  579 #endif
  580 #endif
  581 
  582 #ifndef __RCSID
  583 #ifndef NO__RCSID
  584 #define __RCSID(s)      __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  585 #else
  586 #define __RCSID(s)      struct __hack
  587 #endif
  588 #endif
  589 
  590 #ifndef __RCSID_SOURCE
  591 #ifndef NO__RCSID_SOURCE
  592 #define __RCSID_SOURCE(s)       __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
  593 #else
  594 #define __RCSID_SOURCE(s)       struct __hack
  595 #endif
  596 #endif
  597 
  598 #ifndef __SCCSID
  599 #ifndef NO__SCCSID
  600 #define __SCCSID(s)     __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
  601 #else
  602 #define __SCCSID(s)     struct __hack
  603 #endif
  604 #endif
  605 
  606 #ifndef __COPYRIGHT
  607 #ifndef NO__COPYRIGHT
  608 #define __COPYRIGHT(s)  __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
  609 #else
  610 #define __COPYRIGHT(s)  struct __hack
  611 #endif
  612 #endif
  613 
  614 #ifndef __DECONST
  615 #define __DECONST(type, var)    ((type)(__uintptr_t)(const void *)(var))
  616 #endif
  617 
  618 #ifndef __DEVOLATILE
  619 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
  620 #endif
  621 
  622 #ifndef __DEQUALIFY
  623 #define __DEQUALIFY(type, var)  ((type)(__uintptr_t)(const volatile void *)(var))
  624 #endif
  625 
  626 /*-
  627  * The following definitions are an extension of the behavior originally
  628  * implemented in <sys/_posix.h>, but with a different level of granularity.
  629  * POSIX.1 requires that the macros we test be defined before any standard
  630  * header file is included.
  631  *
  632  * Here's a quick run-down of the versions:
  633  *  defined(_POSIX_SOURCE)              1003.1-1988
  634  *  _POSIX_C_SOURCE == 1                1003.1-1990
  635  *  _POSIX_C_SOURCE == 2                1003.2-1992 C Language Binding Option
  636  *  _POSIX_C_SOURCE == 199309           1003.1b-1993
  637  *  _POSIX_C_SOURCE == 199506           1003.1c-1995, 1003.1i-1995,
  638  *                                      and the omnibus ISO/IEC 9945-1: 1996
  639  *  _POSIX_C_SOURCE == 200112           1003.1-2001
  640  *  _POSIX_C_SOURCE == 200809           1003.1-2008
  641  *
  642  * In addition, the X/Open Portability Guide, which is now the Single UNIX
  643  * Specification, defines a feature-test macro which indicates the version of
  644  * that specification, and which subsumes _POSIX_C_SOURCE.
  645  *
  646  * Our macros begin with two underscores to avoid namespace screwage.
  647  */
  648 
  649 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
  650 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
  651 #undef _POSIX_C_SOURCE          /* Probably illegal, but beyond caring now. */
  652 #define _POSIX_C_SOURCE         199009
  653 #endif
  654 
  655 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
  656 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
  657 #undef _POSIX_C_SOURCE
  658 #define _POSIX_C_SOURCE         199209
  659 #endif
  660 
  661 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
  662 #ifdef _XOPEN_SOURCE
  663 #if _XOPEN_SOURCE - 0 >= 700
  664 #define __XSI_VISIBLE           700
  665 #undef _POSIX_C_SOURCE
  666 #define _POSIX_C_SOURCE         200809
  667 #elif _XOPEN_SOURCE - 0 >= 600
  668 #define __XSI_VISIBLE           600
  669 #undef _POSIX_C_SOURCE
  670 #define _POSIX_C_SOURCE         200112
  671 #elif _XOPEN_SOURCE - 0 >= 500
  672 #define __XSI_VISIBLE           500
  673 #undef _POSIX_C_SOURCE
  674 #define _POSIX_C_SOURCE         199506
  675 #endif
  676 #endif
  677 
  678 /*
  679  * Deal with all versions of POSIX.  The ordering relative to the tests above is
  680  * important.
  681  */
  682 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
  683 #define _POSIX_C_SOURCE         198808
  684 #endif
  685 #ifdef _POSIX_C_SOURCE
  686 #if _POSIX_C_SOURCE >= 200809
  687 #define __POSIX_VISIBLE         200809
  688 #define __ISO_C_VISIBLE         1999
  689 #elif _POSIX_C_SOURCE >= 200112
  690 #define __POSIX_VISIBLE         200112
  691 #define __ISO_C_VISIBLE         1999
  692 #elif _POSIX_C_SOURCE >= 199506
  693 #define __POSIX_VISIBLE         199506
  694 #define __ISO_C_VISIBLE         1990
  695 #elif _POSIX_C_SOURCE >= 199309
  696 #define __POSIX_VISIBLE         199309
  697 #define __ISO_C_VISIBLE         1990
  698 #elif _POSIX_C_SOURCE >= 199209
  699 #define __POSIX_VISIBLE         199209
  700 #define __ISO_C_VISIBLE         1990
  701 #elif _POSIX_C_SOURCE >= 199009
  702 #define __POSIX_VISIBLE         199009
  703 #define __ISO_C_VISIBLE         1990
  704 #else
  705 #define __POSIX_VISIBLE         198808
  706 #define __ISO_C_VISIBLE         0
  707 #endif /* _POSIX_C_SOURCE */
  708 #else
  709 /*-
  710  * Deal with _ANSI_SOURCE:
  711  * If it is defined, and no other compilation environment is explicitly
  712  * requested, then define our internal feature-test macros to zero.  This
  713  * makes no difference to the preprocessor (undefined symbols in preprocessing
  714  * expressions are defined to have value zero), but makes it more convenient for
  715  * a test program to print out the values.
  716  *
  717  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
  718  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
  719  * environment (and in fact we will never get here).
  720  */
  721 #if defined(_ANSI_SOURCE)       /* Hide almost everything. */
  722 #define __POSIX_VISIBLE         0
  723 #define __XSI_VISIBLE           0
  724 #define __BSD_VISIBLE           0
  725 #define __ISO_C_VISIBLE         1990
  726 #elif defined(_C99_SOURCE)      /* Localism to specify strict C99 env. */
  727 #define __POSIX_VISIBLE         0
  728 #define __XSI_VISIBLE           0
  729 #define __BSD_VISIBLE           0
  730 #define __ISO_C_VISIBLE         1999
  731 #elif defined(_C11_SOURCE)      /* Localism to specify strict C11 env. */
  732 #define __POSIX_VISIBLE         0
  733 #define __XSI_VISIBLE           0
  734 #define __BSD_VISIBLE           0
  735 #define __ISO_C_VISIBLE         2011
  736 #else                           /* Default environment: show everything. */
  737 #define __POSIX_VISIBLE         200809
  738 #define __XSI_VISIBLE           700
  739 #define __BSD_VISIBLE           1
  740 #define __ISO_C_VISIBLE         2011
  741 #endif
  742 #endif
  743 
  744 #if defined(__mips) || defined(__powerpc64__)
  745 #define __NO_TLS 1
  746 #endif
  747 
  748 #endif /* !_SYS_CDEFS_H_ */

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