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/10.4/sys/sys/cdefs.h 314494 2017-03-01 13:47:36Z avg $
   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 !defined(__cplusplus) && !__has_extension(c_atomic) && \
  277     !__has_extension(cxx_atomic)
  278 /*
  279  * No native support for _Atomic(). Place object in structure to prevent
  280  * most forms of direct non-atomic access.
  281  */
  282 #define _Atomic(T)              struct { T volatile __val; }
  283 #endif
  284 
  285 #if defined(__cplusplus) && __cplusplus >= 201103L
  286 #define _Noreturn               [[noreturn]]
  287 #else
  288 #define _Noreturn               __dead2
  289 #endif
  290 
  291 #if !__has_extension(c_static_assert)
  292 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
  293     __has_extension(cxx_static_assert)
  294 #define _Static_assert(x, y)    static_assert(x, y)
  295 #elif defined(__COUNTER__)
  296 #define _Static_assert(x, y)    __Static_assert(x, __COUNTER__)
  297 #define __Static_assert(x, y)   ___Static_assert(x, y)
  298 #define ___Static_assert(x, y)  typedef char __assert_ ## y[(x) ? 1 : -1] \
  299                                 __unused
  300 #else
  301 #define _Static_assert(x, y)    struct __hack
  302 #endif
  303 #endif
  304 
  305 #if !__has_extension(c_thread_local)
  306 /* XXX: Change this to test against C++11 when clang in base supports it. */
  307 #if /* (defined(__cplusplus) && __cplusplus >= 201103L) || */ \
  308     __has_extension(cxx_thread_local)
  309 #define _Thread_local           thread_local
  310 #else
  311 #define _Thread_local           __thread
  312 #endif
  313 #endif
  314 
  315 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
  316 
  317 /*
  318  * Emulation of C11 _Generic().  Unlike the previously defined C11
  319  * keywords, it is not possible to implement this using exactly the same
  320  * syntax.  Therefore implement something similar under the name
  321  * __generic().  Unlike _Generic(), this macro can only distinguish
  322  * between a single type, so it requires nested invocations to
  323  * distinguish multiple cases.
  324  */
  325 
  326 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
  327 #define __generic(expr, t, yes, no)                                     \
  328         _Generic(expr, t: yes, default: no)
  329 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
  330 #define __generic(expr, t, yes, no)                                     \
  331         __builtin_choose_expr(                                          \
  332             __builtin_types_compatible_p(__typeof(expr), t), yes, no)
  333 #endif
  334 
  335 /*
  336  * C99 Static array indices in function parameter declarations.  Syntax such as:
  337  * void bar(int myArray[static 10]);
  338  * is allowed in C99 but not in C++.  Define __min_size appropriately so
  339  * headers using it can be compiled in either language.  Use like this:
  340  * void bar(int myArray[__min_size(10)]);
  341  */
  342 #if !defined(__cplusplus) && \
  343     (defined(__clang__) || __GNUC_PREREQ__(4, 6)) && \
  344     (!defined(__STDC_VERSION__) || (__STDC_VERSION__ >= 199901))
  345 #define __min_size(x)   static (x)
  346 #else
  347 #define __min_size(x)   (x)
  348 #endif
  349 
  350 #if __GNUC_PREREQ__(2, 96)
  351 #define __malloc_like   __attribute__((__malloc__))
  352 #define __pure          __attribute__((__pure__))
  353 #else
  354 #define __malloc_like
  355 #define __pure
  356 #endif
  357 
  358 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
  359 #define __always_inline __attribute__((__always_inline__))
  360 #else
  361 #define __always_inline
  362 #endif
  363 
  364 #if __GNUC_PREREQ__(3, 1)
  365 #define __noinline      __attribute__ ((__noinline__))
  366 #else
  367 #define __noinline
  368 #endif
  369 
  370 #if __GNUC_PREREQ__(3, 3)
  371 #define __nonnull(x)    __attribute__((__nonnull__(x)))
  372 #else
  373 #define __nonnull(x)
  374 #endif
  375 
  376 #if __GNUC_PREREQ__(3, 4)
  377 #define __fastcall      __attribute__((__fastcall__))
  378 #define __result_use_check      __attribute__((__warn_unused_result__))
  379 #else
  380 #define __fastcall
  381 #define __result_use_check
  382 #endif
  383 
  384 #if __GNUC_PREREQ__(4, 1)
  385 #define __returns_twice __attribute__((__returns_twice__))
  386 #else
  387 #define __returns_twice
  388 #endif
  389 
  390 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
  391 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  392 #define __func__        NULL
  393 #endif
  394 
  395 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
  396 #define __LONG_LONG_SUPPORTED
  397 #endif
  398 
  399 /* C++11 exposes a load of C99 stuff */
  400 #if defined(__cplusplus) && __cplusplus >= 201103L
  401 #define __LONG_LONG_SUPPORTED
  402 #ifndef __STDC_LIMIT_MACROS
  403 #define __STDC_LIMIT_MACROS
  404 #endif
  405 #ifndef __STDC_CONSTANT_MACROS
  406 #define __STDC_CONSTANT_MACROS
  407 #endif
  408 #endif
  409 
  410 /*
  411  * GCC 2.95 provides `__restrict' as an extension to C90 to support the
  412  * C99-specific `restrict' type qualifier.  We happen to use `__restrict' as
  413  * a way to define the `restrict' type qualifier without disturbing older
  414  * software that is unaware of C99 keywords.
  415  */
  416 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
  417 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
  418 #define __restrict
  419 #else
  420 #define __restrict      restrict
  421 #endif
  422 #endif
  423 
  424 /*
  425  * GNU C version 2.96 adds explicit branch prediction so that
  426  * the CPU back-end can hint the processor and also so that
  427  * code blocks can be reordered such that the predicted path
  428  * sees a more linear flow, thus improving cache behavior, etc.
  429  *
  430  * The following two macros provide us with a way to utilize this
  431  * compiler feature.  Use __predict_true() if you expect the expression
  432  * to evaluate to true, and __predict_false() if you expect the
  433  * expression to evaluate to false.
  434  *
  435  * A few notes about usage:
  436  *
  437  *      * Generally, __predict_false() error condition checks (unless
  438  *        you have some _strong_ reason to do otherwise, in which case
  439  *        document it), and/or __predict_true() `no-error' condition
  440  *        checks, assuming you want to optimize for the no-error case.
  441  *
  442  *      * Other than that, if you don't know the likelihood of a test
  443  *        succeeding from empirical or other `hard' evidence, don't
  444  *        make predictions.
  445  *
  446  *      * These are meant to be used in places that are run `a lot'.
  447  *        It is wasteful to make predictions in code that is run
  448  *        seldomly (e.g. at subsystem initialization time) as the
  449  *        basic block reordering that this affects can often generate
  450  *        larger code.
  451  */
  452 #if __GNUC_PREREQ__(2, 96)
  453 #define __predict_true(exp)     __builtin_expect((exp), 1)
  454 #define __predict_false(exp)    __builtin_expect((exp), 0)
  455 #else
  456 #define __predict_true(exp)     (exp)
  457 #define __predict_false(exp)    (exp)
  458 #endif
  459 
  460 #if __GNUC_PREREQ__(4, 0)
  461 #define __hidden        __attribute__((__visibility__("hidden")))
  462 #define __exported      __attribute__((__visibility__("default")))
  463 #else
  464 #define __hidden
  465 #define __exported
  466 #endif
  467 
  468 /*
  469  * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
  470  * require it.
  471  */
  472 #if __GNUC_PREREQ__(4, 1)
  473 #define __offsetof(type, field)  __builtin_offsetof(type, field)
  474 #else
  475 #ifndef __cplusplus
  476 #define __offsetof(type, field) \
  477         ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
  478 #else
  479 #define __offsetof(type, field)                                 \
  480   (__offsetof__ (reinterpret_cast <__size_t>                    \
  481                  (&reinterpret_cast <const volatile char &>     \
  482                   (static_cast<type *> (0)->field))))
  483 #endif
  484 #endif
  485 #define __rangeof(type, start, end) \
  486         (__offsetof(type, end) - __offsetof(type, start))
  487 
  488 /*
  489  * Given the pointer x to the member m of the struct s, return
  490  * a pointer to the containing structure.  When using GCC, we first
  491  * assign pointer x to a local variable, to check that its type is
  492  * compatible with member m.
  493  */
  494 #if __GNUC_PREREQ__(3, 1)
  495 #define __containerof(x, s, m) ({                                       \
  496         const volatile __typeof(((s *)0)->m) *__x = (x);                \
  497         __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
  498 })
  499 #else
  500 #define __containerof(x, s, m)                                          \
  501         __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
  502 #endif
  503 
  504 /*
  505  * Compiler-dependent macros to declare that functions take printf-like
  506  * or scanf-like arguments.  They are null except for versions of gcc
  507  * that are known to support the features properly (old versions of gcc-2
  508  * didn't permit keeping the keywords out of the application namespace).
  509  */
  510 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  511 #define __printflike(fmtarg, firstvararg)
  512 #define __scanflike(fmtarg, firstvararg)
  513 #define __format_arg(fmtarg)
  514 #define __strfmonlike(fmtarg, firstvararg)
  515 #define __strftimelike(fmtarg, firstvararg)
  516 #else
  517 #define __printflike(fmtarg, firstvararg) \
  518             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
  519 #define __scanflike(fmtarg, firstvararg) \
  520             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
  521 #define __format_arg(fmtarg)    __attribute__((__format_arg__ (fmtarg)))
  522 #define __strfmonlike(fmtarg, firstvararg) \
  523             __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
  524 #define __strftimelike(fmtarg, firstvararg) \
  525             __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
  526 #endif
  527 
  528 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
  529 #if defined(__FreeBSD_cc_version) && __FreeBSD_cc_version >= 300001 && \
  530     defined(__GNUC__) && !defined(__INTEL_COMPILER)
  531 #define __printf0like(fmtarg, firstvararg) \
  532             __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
  533 #else
  534 #define __printf0like(fmtarg, firstvararg)
  535 #endif
  536 
  537 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  538 #ifndef __INTEL_COMPILER
  539 #define __strong_reference(sym,aliassym)        \
  540         extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
  541 #endif
  542 #ifdef __STDC__
  543 #define __weak_reference(sym,alias)     \
  544         __asm__(".weak " #alias);       \
  545         __asm__(".equ "  #alias ", " #sym)
  546 #define __warn_references(sym,msg)      \
  547         __asm__(".section .gnu.warning." #sym); \
  548         __asm__(".asciz \"" msg "\"");  \
  549         __asm__(".previous")
  550 #define __sym_compat(sym,impl,verid)    \
  551         __asm__(".symver " #impl ", " #sym "@" #verid)
  552 #define __sym_default(sym,impl,verid)   \
  553         __asm__(".symver " #impl ", " #sym "@@" #verid)
  554 #else
  555 #define __weak_reference(sym,alias)     \
  556         __asm__(".weak alias");         \
  557         __asm__(".equ alias, sym")
  558 #define __warn_references(sym,msg)      \
  559         __asm__(".section .gnu.warning.sym"); \
  560         __asm__(".asciz \"msg\"");      \
  561         __asm__(".previous")
  562 #define __sym_compat(sym,impl,verid)    \
  563         __asm__(".symver impl, sym@verid")
  564 #define __sym_default(impl,sym,verid)   \
  565         __asm__(".symver impl, sym@@verid")
  566 #endif  /* __STDC__ */
  567 #endif  /* __GNUC__ || __INTEL_COMPILER */
  568 
  569 #define __GLOBL1(sym)   __asm__(".globl " #sym)
  570 #define __GLOBL(sym)    __GLOBL1(sym)
  571 
  572 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  573 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
  574 #else
  575 /*
  576  * The following definition might not work well if used in header files,
  577  * but it should be better than nothing.  If you want a "do nothing"
  578  * version, then it should generate some harmless declaration, such as:
  579  *    #define __IDSTRING(name,string)   struct __hack
  580  */
  581 #define __IDSTRING(name,string) static const char name[] __unused = string
  582 #endif
  583 
  584 /*
  585  * Embed the rcs id of a source file in the resulting library.  Note that in
  586  * more recent ELF binutils, we use .ident allowing the ID to be stripped.
  587  * Usage:
  588  *      __FBSDID("$FreeBSD: releng/10.4/sys/sys/cdefs.h 314494 2017-03-01 13:47:36Z avg $");
  589  */
  590 #ifndef __FBSDID
  591 #if !defined(lint) && !defined(STRIP_FBSDID)
  592 #define __FBSDID(s)     __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  593 #else
  594 #define __FBSDID(s)     struct __hack
  595 #endif
  596 #endif
  597 
  598 #ifndef __RCSID
  599 #ifndef NO__RCSID
  600 #define __RCSID(s)      __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  601 #else
  602 #define __RCSID(s)      struct __hack
  603 #endif
  604 #endif
  605 
  606 #ifndef __RCSID_SOURCE
  607 #ifndef NO__RCSID_SOURCE
  608 #define __RCSID_SOURCE(s)       __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
  609 #else
  610 #define __RCSID_SOURCE(s)       struct __hack
  611 #endif
  612 #endif
  613 
  614 #ifndef __SCCSID
  615 #ifndef NO__SCCSID
  616 #define __SCCSID(s)     __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
  617 #else
  618 #define __SCCSID(s)     struct __hack
  619 #endif
  620 #endif
  621 
  622 #ifndef __COPYRIGHT
  623 #ifndef NO__COPYRIGHT
  624 #define __COPYRIGHT(s)  __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
  625 #else
  626 #define __COPYRIGHT(s)  struct __hack
  627 #endif
  628 #endif
  629 
  630 #ifndef __DECONST
  631 #define __DECONST(type, var)    ((type)(__uintptr_t)(const void *)(var))
  632 #endif
  633 
  634 #ifndef __DEVOLATILE
  635 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
  636 #endif
  637 
  638 #ifndef __DEQUALIFY
  639 #define __DEQUALIFY(type, var)  ((type)(__uintptr_t)(const volatile void *)(var))
  640 #endif
  641 
  642 /*-
  643  * The following definitions are an extension of the behavior originally
  644  * implemented in <sys/_posix.h>, but with a different level of granularity.
  645  * POSIX.1 requires that the macros we test be defined before any standard
  646  * header file is included.
  647  *
  648  * Here's a quick run-down of the versions:
  649  *  defined(_POSIX_SOURCE)              1003.1-1988
  650  *  _POSIX_C_SOURCE == 1                1003.1-1990
  651  *  _POSIX_C_SOURCE == 2                1003.2-1992 C Language Binding Option
  652  *  _POSIX_C_SOURCE == 199309           1003.1b-1993
  653  *  _POSIX_C_SOURCE == 199506           1003.1c-1995, 1003.1i-1995,
  654  *                                      and the omnibus ISO/IEC 9945-1: 1996
  655  *  _POSIX_C_SOURCE == 200112           1003.1-2001
  656  *  _POSIX_C_SOURCE == 200809           1003.1-2008
  657  *
  658  * In addition, the X/Open Portability Guide, which is now the Single UNIX
  659  * Specification, defines a feature-test macro which indicates the version of
  660  * that specification, and which subsumes _POSIX_C_SOURCE.
  661  *
  662  * Our macros begin with two underscores to avoid namespace screwage.
  663  */
  664 
  665 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
  666 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
  667 #undef _POSIX_C_SOURCE          /* Probably illegal, but beyond caring now. */
  668 #define _POSIX_C_SOURCE         199009
  669 #endif
  670 
  671 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
  672 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
  673 #undef _POSIX_C_SOURCE
  674 #define _POSIX_C_SOURCE         199209
  675 #endif
  676 
  677 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
  678 #ifdef _XOPEN_SOURCE
  679 #if _XOPEN_SOURCE - 0 >= 700
  680 #define __XSI_VISIBLE           700
  681 #undef _POSIX_C_SOURCE
  682 #define _POSIX_C_SOURCE         200809
  683 #elif _XOPEN_SOURCE - 0 >= 600
  684 #define __XSI_VISIBLE           600
  685 #undef _POSIX_C_SOURCE
  686 #define _POSIX_C_SOURCE         200112
  687 #elif _XOPEN_SOURCE - 0 >= 500
  688 #define __XSI_VISIBLE           500
  689 #undef _POSIX_C_SOURCE
  690 #define _POSIX_C_SOURCE         199506
  691 #endif
  692 #endif
  693 
  694 /*
  695  * Deal with all versions of POSIX.  The ordering relative to the tests above is
  696  * important.
  697  */
  698 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
  699 #define _POSIX_C_SOURCE         198808
  700 #endif
  701 #ifdef _POSIX_C_SOURCE
  702 #if _POSIX_C_SOURCE >= 200809
  703 #define __POSIX_VISIBLE         200809
  704 #define __ISO_C_VISIBLE         1999
  705 #elif _POSIX_C_SOURCE >= 200112
  706 #define __POSIX_VISIBLE         200112
  707 #define __ISO_C_VISIBLE         1999
  708 #elif _POSIX_C_SOURCE >= 199506
  709 #define __POSIX_VISIBLE         199506
  710 #define __ISO_C_VISIBLE         1990
  711 #elif _POSIX_C_SOURCE >= 199309
  712 #define __POSIX_VISIBLE         199309
  713 #define __ISO_C_VISIBLE         1990
  714 #elif _POSIX_C_SOURCE >= 199209
  715 #define __POSIX_VISIBLE         199209
  716 #define __ISO_C_VISIBLE         1990
  717 #elif _POSIX_C_SOURCE >= 199009
  718 #define __POSIX_VISIBLE         199009
  719 #define __ISO_C_VISIBLE         1990
  720 #else
  721 #define __POSIX_VISIBLE         198808
  722 #define __ISO_C_VISIBLE         0
  723 #endif /* _POSIX_C_SOURCE */
  724 #else
  725 /*-
  726  * Deal with _ANSI_SOURCE:
  727  * If it is defined, and no other compilation environment is explicitly
  728  * requested, then define our internal feature-test macros to zero.  This
  729  * makes no difference to the preprocessor (undefined symbols in preprocessing
  730  * expressions are defined to have value zero), but makes it more convenient for
  731  * a test program to print out the values.
  732  *
  733  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
  734  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
  735  * environment (and in fact we will never get here).
  736  */
  737 #if defined(_ANSI_SOURCE)       /* Hide almost everything. */
  738 #define __POSIX_VISIBLE         0
  739 #define __XSI_VISIBLE           0
  740 #define __BSD_VISIBLE           0
  741 #define __ISO_C_VISIBLE         1990
  742 #elif defined(_C99_SOURCE)      /* Localism to specify strict C99 env. */
  743 #define __POSIX_VISIBLE         0
  744 #define __XSI_VISIBLE           0
  745 #define __BSD_VISIBLE           0
  746 #define __ISO_C_VISIBLE         1999
  747 #elif defined(_C11_SOURCE)      /* Localism to specify strict C11 env. */
  748 #define __POSIX_VISIBLE         0
  749 #define __XSI_VISIBLE           0
  750 #define __BSD_VISIBLE           0
  751 #define __ISO_C_VISIBLE         2011
  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 #endif
  758 #endif
  759 
  760 #if defined(__mips) || defined(__powerpc64__)
  761 #define __NO_TLS 1
  762 #endif
  763 
  764 #endif /* !_SYS_CDEFS_H_ */

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