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/10.0/sys/sys/cdefs.h 251804 2013-06-16 10:48:47Z ed $
   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_extension
   44 #define __has_extension         __has_feature
   45 #endif
   46 #ifndef __has_feature
   47 #define __has_feature(x)        0
   48 #endif
   49 #ifndef __has_include
   50 #define __has_include(x)        0
   51 #endif
   52 #ifndef __has_builtin
   53 #define __has_builtin(x)        0
   54 #endif
   55 
   56 #if defined(__cplusplus)
   57 #define __BEGIN_DECLS   extern "C" {
   58 #define __END_DECLS     }
   59 #else
   60 #define __BEGIN_DECLS
   61 #define __END_DECLS
   62 #endif
   63 
   64 /*
   65  * This code has been put in place to help reduce the addition of
   66  * compiler specific defines in FreeBSD code.  It helps to aid in
   67  * having a compiler-agnostic source tree.
   68  */
   69 
   70 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
   71 
   72 #if __GNUC__ >= 3 || defined(__INTEL_COMPILER)
   73 #define __GNUCLIKE_ASM 3
   74 #define __GNUCLIKE_MATH_BUILTIN_CONSTANTS
   75 #else
   76 #define __GNUCLIKE_ASM 2
   77 #endif
   78 #define __GNUCLIKE___TYPEOF 1
   79 #define __GNUCLIKE___OFFSETOF 1
   80 #define __GNUCLIKE___SECTION 1
   81 
   82 #ifndef __INTEL_COMPILER
   83 # define __GNUCLIKE_CTOR_SECTION_HANDLING 1
   84 #endif
   85 
   86 #define __GNUCLIKE_BUILTIN_CONSTANT_P 1
   87 # if defined(__INTEL_COMPILER) && defined(__cplusplus) \
   88     && __INTEL_COMPILER < 800
   89 #  undef __GNUCLIKE_BUILTIN_CONSTANT_P
   90 # endif
   91 
   92 #if (__GNUC_MINOR__ > 95 || __GNUC__ >= 3) && !defined(__INTEL_COMPILER)
   93 # define __GNUCLIKE_BUILTIN_VARARGS 1
   94 # define __GNUCLIKE_BUILTIN_STDARG 1
   95 # define __GNUCLIKE_BUILTIN_VAALIST 1
   96 #endif
   97 
   98 #if defined(__GNUC__)
   99 # define __GNUC_VA_LIST_COMPATIBILITY 1
  100 #endif
  101 
  102 /*
  103  * Compiler memory barriers, specific to gcc and clang.
  104  */
  105 #if defined(__GNUC__)
  106 #define __compiler_membar()     __asm __volatile(" " : : : "memory")
  107 #endif
  108 
  109 #ifndef __INTEL_COMPILER
  110 # define __GNUCLIKE_BUILTIN_NEXT_ARG 1
  111 # define __GNUCLIKE_MATH_BUILTIN_RELOPS
  112 #endif
  113 
  114 #define __GNUCLIKE_BUILTIN_MEMCPY 1
  115 
  116 /* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */
  117 #define __CC_SUPPORTS_INLINE 1
  118 #define __CC_SUPPORTS___INLINE 1
  119 #define __CC_SUPPORTS___INLINE__ 1
  120 
  121 #define __CC_SUPPORTS___FUNC__ 1
  122 #define __CC_SUPPORTS_WARNING 1
  123 
  124 #define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
  125 
  126 #define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
  127 
  128 #endif /* __GNUC__ || __INTEL_COMPILER */
  129 
  130 /*
  131  * Macro to test if we're using a specific version of gcc or later.
  132  */
  133 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
  134 #define __GNUC_PREREQ__(ma, mi) \
  135         (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
  136 #else
  137 #define __GNUC_PREREQ__(ma, mi) 0
  138 #endif
  139 
  140 /*
  141  * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
  142  * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
  143  * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
  144  * mode -- there must be no spaces between its arguments, and for nested
  145  * __CONCAT's, all the __CONCAT's must be at the left.  __CONCAT can also
  146  * concatenate double-quoted strings produced by the __STRING macro, but
  147  * this only works with ANSI C.
  148  *
  149  * __XSTRING is like __STRING, but it expands any macros in its argument
  150  * first.  It is only available with ANSI C.
  151  */
  152 #if defined(__STDC__) || defined(__cplusplus)
  153 #define __P(protos)     protos          /* full-blown ANSI C */
  154 #define __CONCAT1(x,y)  x ## y
  155 #define __CONCAT(x,y)   __CONCAT1(x,y)
  156 #define __STRING(x)     #x              /* stringify without expanding x */
  157 #define __XSTRING(x)    __STRING(x)     /* expand x, then stringify */
  158 
  159 #define __const         const           /* define reserved names to standard */
  160 #define __signed        signed
  161 #define __volatile      volatile
  162 #if defined(__cplusplus)
  163 #define __inline        inline          /* convert to C++ keyword */
  164 #else
  165 #if !(defined(__CC_SUPPORTS___INLINE))
  166 #define __inline                        /* delete GCC keyword */
  167 #endif /* ! __CC_SUPPORTS___INLINE */
  168 #endif /* !__cplusplus */
  169 
  170 #else   /* !(__STDC__ || __cplusplus) */
  171 #define __P(protos)     ()              /* traditional C preprocessor */
  172 #define __CONCAT(x,y)   x/**/y
  173 #define __STRING(x)     "x"
  174 
  175 #if !defined(__CC_SUPPORTS___INLINE)
  176 #define __const                         /* delete pseudo-ANSI C keywords */
  177 #define __inline
  178 #define __signed
  179 #define __volatile
  180 /*
  181  * In non-ANSI C environments, new programs will want ANSI-only C keywords
  182  * deleted from the program and old programs will want them left alone.
  183  * When using a compiler other than gcc, programs using the ANSI C keywords
  184  * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
  185  * When using "gcc -traditional", we assume that this is the intent; if
  186  * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
  187  */
  188 #ifndef NO_ANSI_KEYWORDS
  189 #define const                           /* delete ANSI C keywords */
  190 #define inline
  191 #define signed
  192 #define volatile
  193 #endif  /* !NO_ANSI_KEYWORDS */
  194 #endif  /* !__CC_SUPPORTS___INLINE */
  195 #endif  /* !(__STDC__ || __cplusplus) */
  196 
  197 /*
  198  * Compiler-dependent macros to help declare dead (non-returning) and
  199  * pure (no side effects) functions, and unused variables.  They are
  200  * null except for versions of gcc that are known to support the features
  201  * properly (old versions of gcc-2 supported the dead and pure features
  202  * in a different (wrong) way).  If we do not provide an implementation
  203  * for a given compiler, let the compile fail if it is told to use
  204  * a feature that we cannot live without.
  205  */
  206 #ifdef lint
  207 #define __dead2
  208 #define __pure2
  209 #define __unused
  210 #define __packed
  211 #define __aligned(x)
  212 #define __section(x)
  213 #else
  214 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
  215 #define __dead2
  216 #define __pure2
  217 #define __unused
  218 #endif
  219 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
  220 #define __dead2         __attribute__((__noreturn__))
  221 #define __pure2         __attribute__((__const__))
  222 #define __unused
  223 /* XXX Find out what to do for __packed, __aligned and __section */
  224 #endif
  225 #if __GNUC_PREREQ__(2, 7)
  226 #define __dead2         __attribute__((__noreturn__))
  227 #define __pure2         __attribute__((__const__))
  228 #define __unused        __attribute__((__unused__))
  229 #define __used          __attribute__((__used__))
  230 #define __packed        __attribute__((__packed__))
  231 #define __aligned(x)    __attribute__((__aligned__(x)))
  232 #define __section(x)    __attribute__((__section__(x)))
  233 #endif
  234 #if defined(__INTEL_COMPILER)
  235 #define __dead2         __attribute__((__noreturn__))
  236 #define __pure2         __attribute__((__const__))
  237 #define __unused        __attribute__((__unused__))
  238 #define __used          __attribute__((__used__))
  239 #define __packed        __attribute__((__packed__))
  240 #define __aligned(x)    __attribute__((__aligned__(x)))
  241 #define __section(x)    __attribute__((__section__(x)))
  242 #endif
  243 #endif
  244 
  245 #if !__GNUC_PREREQ__(2, 95)
  246 #define __alignof(x)    __offsetof(struct { char __a; x __b; }, __b)
  247 #endif
  248 
  249 /*
  250  * Keywords added in C11.
  251  */
  252 
  253 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L
  254 
  255 #if !__has_extension(c_alignas)
  256 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
  257     __has_extension(cxx_alignas)
  258 #define _Alignas(x)             alignas(x)
  259 #else
  260 /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */
  261 #define _Alignas(x)             __aligned(x)
  262 #endif
  263 #endif
  264 
  265 #if defined(__cplusplus) && __cplusplus >= 201103L
  266 #define _Alignof(x)             alignof(x)
  267 #else
  268 #define _Alignof(x)             __alignof(x)
  269 #endif
  270 
  271 #if !__has_extension(c_atomic) && !__has_extension(cxx_atomic)
  272 /*
  273  * No native support for _Atomic(). Place object in structure to prevent
  274  * most forms of direct non-atomic access.
  275  */
  276 #define _Atomic(T)              struct { T volatile __val; }
  277 #endif
  278 
  279 #if defined(__cplusplus) && __cplusplus >= 201103L
  280 #define _Noreturn               [[noreturn]]
  281 #else
  282 #define _Noreturn               __dead2
  283 #endif
  284 
  285 #if !__has_extension(c_static_assert)
  286 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
  287     __has_extension(cxx_static_assert)
  288 #define _Static_assert(x, y)    static_assert(x, y)
  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]
  293 #else
  294 #define _Static_assert(x, y)    struct __hack
  295 #endif
  296 #endif
  297 
  298 #if !__has_extension(c_thread_local)
  299 /* XXX: Change this to test against C++11 when clang in base supports it. */
  300 #if /* (defined(__cplusplus) && __cplusplus >= 201103L) || */ \
  301     __has_extension(cxx_thread_local)
  302 #define _Thread_local           thread_local
  303 #else
  304 #define _Thread_local           __thread
  305 #endif
  306 #endif
  307 
  308 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
  309 
  310 /*
  311  * Emulation of C11 _Generic().  Unlike the previously defined C11
  312  * keywords, it is not possible to implement this using exactly the same
  313  * syntax.  Therefore implement something similar under the name
  314  * __generic().  Unlike _Generic(), this macro can only distinguish
  315  * between a single type, so it requires nested invocations to
  316  * distinguish multiple cases.
  317  */
  318 
  319 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
  320 #define __generic(expr, t, yes, no)                                     \
  321         _Generic(expr, t: yes, default: no)
  322 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
  323 #define __generic(expr, t, yes, no)                                     \
  324         __builtin_choose_expr(                                          \
  325             __builtin_types_compatible_p(__typeof(expr), t), yes, no)
  326 #endif
  327 
  328 #if __GNUC_PREREQ__(2, 96)
  329 #define __malloc_like   __attribute__((__malloc__))
  330 #define __pure          __attribute__((__pure__))
  331 #else
  332 #define __malloc_like
  333 #define __pure
  334 #endif
  335 
  336 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
  337 #define __always_inline __attribute__((__always_inline__))
  338 #else
  339 #define __always_inline
  340 #endif
  341 
  342 #if __GNUC_PREREQ__(3, 1)
  343 #define __noinline      __attribute__ ((__noinline__))
  344 #else
  345 #define __noinline
  346 #endif
  347 
  348 #if __GNUC_PREREQ__(3, 3)
  349 #define __nonnull(x)    __attribute__((__nonnull__(x)))
  350 #else
  351 #define __nonnull(x)
  352 #endif
  353 
  354 #if __GNUC_PREREQ__(3, 4)
  355 #define __fastcall      __attribute__((__fastcall__))
  356 #else
  357 #define __fastcall
  358 #endif
  359 
  360 #if __GNUC_PREREQ__(4, 1)
  361 #define __returns_twice __attribute__((__returns_twice__))
  362 #else
  363 #define __returns_twice
  364 #endif
  365 
  366 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
  367 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  368 #define __func__        NULL
  369 #endif
  370 
  371 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
  372 #define __LONG_LONG_SUPPORTED
  373 #endif
  374 
  375 /* C++11 exposes a load of C99 stuff */
  376 #if defined(__cplusplus) && __cplusplus >= 201103L
  377 #define __LONG_LONG_SUPPORTED
  378 #ifndef __STDC_LIMIT_MACROS
  379 #define __STDC_LIMIT_MACROS
  380 #endif
  381 #ifndef __STDC_CONSTANT_MACROS
  382 #define __STDC_CONSTANT_MACROS
  383 #endif
  384 #endif
  385 
  386 /*
  387  * GCC 2.95 provides `__restrict' as an extension to C90 to support the
  388  * C99-specific `restrict' type qualifier.  We happen to use `__restrict' as
  389  * a way to define the `restrict' type qualifier without disturbing older
  390  * software that is unaware of C99 keywords.
  391  */
  392 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
  393 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
  394 #define __restrict
  395 #else
  396 #define __restrict      restrict
  397 #endif
  398 #endif
  399 
  400 /*
  401  * GNU C version 2.96 adds explicit branch prediction so that
  402  * the CPU back-end can hint the processor and also so that
  403  * code blocks can be reordered such that the predicted path
  404  * sees a more linear flow, thus improving cache behavior, etc.
  405  *
  406  * The following two macros provide us with a way to utilize this
  407  * compiler feature.  Use __predict_true() if you expect the expression
  408  * to evaluate to true, and __predict_false() if you expect the
  409  * expression to evaluate to false.
  410  *
  411  * A few notes about usage:
  412  *
  413  *      * Generally, __predict_false() error condition checks (unless
  414  *        you have some _strong_ reason to do otherwise, in which case
  415  *        document it), and/or __predict_true() `no-error' condition
  416  *        checks, assuming you want to optimize for the no-error case.
  417  *
  418  *      * Other than that, if you don't know the likelihood of a test
  419  *        succeeding from empirical or other `hard' evidence, don't
  420  *        make predictions.
  421  *
  422  *      * These are meant to be used in places that are run `a lot'.
  423  *        It is wasteful to make predictions in code that is run
  424  *        seldomly (e.g. at subsystem initialization time) as the
  425  *        basic block reordering that this affects can often generate
  426  *        larger code.
  427  */
  428 #if __GNUC_PREREQ__(2, 96)
  429 #define __predict_true(exp)     __builtin_expect((exp), 1)
  430 #define __predict_false(exp)    __builtin_expect((exp), 0)
  431 #else
  432 #define __predict_true(exp)     (exp)
  433 #define __predict_false(exp)    (exp)
  434 #endif
  435 
  436 #if __GNUC_PREREQ__(4, 2)
  437 #define __hidden        __attribute__((__visibility__("hidden")))
  438 #define __exported      __attribute__((__visibility__("default")))
  439 #else
  440 #define __hidden
  441 #define __exported
  442 #endif
  443 
  444 /*
  445  * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
  446  * require it.
  447  */
  448 #if __GNUC_PREREQ__(4, 1)
  449 #define __offsetof(type, field)  __builtin_offsetof(type, field)
  450 #else
  451 #ifndef __cplusplus
  452 #define __offsetof(type, field) \
  453         ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
  454 #else
  455 #define __offsetof(type, field)                                 \
  456   (__offsetof__ (reinterpret_cast <__size_t>                    \
  457                  (&reinterpret_cast <const volatile char &>     \
  458                   (static_cast<type *> (0)->field))))
  459 #endif
  460 #endif
  461 #define __rangeof(type, start, end) \
  462         (__offsetof(type, end) - __offsetof(type, start))
  463 
  464 /*
  465  * Given the pointer x to the member m of the struct s, return
  466  * a pointer to the containing structure.  When using GCC, we first
  467  * assign pointer x to a local variable, to check that its type is
  468  * compatible with member m.
  469  */
  470 #if __GNUC_PREREQ__(3, 1)
  471 #define __containerof(x, s, m) ({                                       \
  472         const volatile __typeof(((s *)0)->m) *__x = (x);                \
  473         __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
  474 })
  475 #else
  476 #define __containerof(x, s, m)                                          \
  477         __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
  478 #endif
  479 
  480 /*
  481  * Compiler-dependent macros to declare that functions take printf-like
  482  * or scanf-like arguments.  They are null except for versions of gcc
  483  * that are known to support the features properly (old versions of gcc-2
  484  * didn't permit keeping the keywords out of the application namespace).
  485  */
  486 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  487 #define __printflike(fmtarg, firstvararg)
  488 #define __scanflike(fmtarg, firstvararg)
  489 #define __format_arg(fmtarg)
  490 #define __strfmonlike(fmtarg, firstvararg)
  491 #define __strftimelike(fmtarg, firstvararg)
  492 #else
  493 #define __printflike(fmtarg, firstvararg) \
  494             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
  495 #define __scanflike(fmtarg, firstvararg) \
  496             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
  497 #define __format_arg(fmtarg)    __attribute__((__format_arg__ (fmtarg)))
  498 #define __strfmonlike(fmtarg, firstvararg) \
  499             __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
  500 #define __strftimelike(fmtarg, firstvararg) \
  501             __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
  502 #endif
  503 
  504 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
  505 #if defined(__FreeBSD_cc_version) && __FreeBSD_cc_version >= 300001 && \
  506     defined(__GNUC__) && !defined(__INTEL_COMPILER)
  507 #define __printf0like(fmtarg, firstvararg) \
  508             __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
  509 #else
  510 #define __printf0like(fmtarg, firstvararg)
  511 #endif
  512 
  513 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  514 #ifndef __INTEL_COMPILER
  515 #define __strong_reference(sym,aliassym)        \
  516         extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
  517 #endif
  518 #ifdef __STDC__
  519 #define __weak_reference(sym,alias)     \
  520         __asm__(".weak " #alias);       \
  521         __asm__(".equ "  #alias ", " #sym)
  522 #define __warn_references(sym,msg)      \
  523         __asm__(".section .gnu.warning." #sym); \
  524         __asm__(".asciz \"" msg "\"");  \
  525         __asm__(".previous")
  526 #define __sym_compat(sym,impl,verid)    \
  527         __asm__(".symver " #impl ", " #sym "@" #verid)
  528 #define __sym_default(sym,impl,verid)   \
  529         __asm__(".symver " #impl ", " #sym "@@" #verid)
  530 #else
  531 #define __weak_reference(sym,alias)     \
  532         __asm__(".weak alias");         \
  533         __asm__(".equ alias, sym")
  534 #define __warn_references(sym,msg)      \
  535         __asm__(".section .gnu.warning.sym"); \
  536         __asm__(".asciz \"msg\"");      \
  537         __asm__(".previous")
  538 #define __sym_compat(sym,impl,verid)    \
  539         __asm__(".symver impl, sym@verid")
  540 #define __sym_default(impl,sym,verid)   \
  541         __asm__(".symver impl, sym@@verid")
  542 #endif  /* __STDC__ */
  543 #endif  /* __GNUC__ || __INTEL_COMPILER */
  544 
  545 #define __GLOBL1(sym)   __asm__(".globl " #sym)
  546 #define __GLOBL(sym)    __GLOBL1(sym)
  547 
  548 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  549 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
  550 #else
  551 /*
  552  * The following definition might not work well if used in header files,
  553  * but it should be better than nothing.  If you want a "do nothing"
  554  * version, then it should generate some harmless declaration, such as:
  555  *    #define __IDSTRING(name,string)   struct __hack
  556  */
  557 #define __IDSTRING(name,string) static const char name[] __unused = string
  558 #endif
  559 
  560 /*
  561  * Embed the rcs id of a source file in the resulting library.  Note that in
  562  * more recent ELF binutils, we use .ident allowing the ID to be stripped.
  563  * Usage:
  564  *      __FBSDID("$FreeBSD: releng/10.0/sys/sys/cdefs.h 251804 2013-06-16 10:48:47Z ed $");
  565  */
  566 #ifndef __FBSDID
  567 #if !defined(lint) && !defined(STRIP_FBSDID)
  568 #define __FBSDID(s)     __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  569 #else
  570 #define __FBSDID(s)     struct __hack
  571 #endif
  572 #endif
  573 
  574 #ifndef __RCSID
  575 #ifndef NO__RCSID
  576 #define __RCSID(s)      __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  577 #else
  578 #define __RCSID(s)      struct __hack
  579 #endif
  580 #endif
  581 
  582 #ifndef __RCSID_SOURCE
  583 #ifndef NO__RCSID_SOURCE
  584 #define __RCSID_SOURCE(s)       __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
  585 #else
  586 #define __RCSID_SOURCE(s)       struct __hack
  587 #endif
  588 #endif
  589 
  590 #ifndef __SCCSID
  591 #ifndef NO__SCCSID
  592 #define __SCCSID(s)     __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
  593 #else
  594 #define __SCCSID(s)     struct __hack
  595 #endif
  596 #endif
  597 
  598 #ifndef __COPYRIGHT
  599 #ifndef NO__COPYRIGHT
  600 #define __COPYRIGHT(s)  __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
  601 #else
  602 #define __COPYRIGHT(s)  struct __hack
  603 #endif
  604 #endif
  605 
  606 #ifndef __DECONST
  607 #define __DECONST(type, var)    ((type)(__uintptr_t)(const void *)(var))
  608 #endif
  609 
  610 #ifndef __DEVOLATILE
  611 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
  612 #endif
  613 
  614 #ifndef __DEQUALIFY
  615 #define __DEQUALIFY(type, var)  ((type)(__uintptr_t)(const volatile void *)(var))
  616 #endif
  617 
  618 /*-
  619  * The following definitions are an extension of the behavior originally
  620  * implemented in <sys/_posix.h>, but with a different level of granularity.
  621  * POSIX.1 requires that the macros we test be defined before any standard
  622  * header file is included.
  623  *
  624  * Here's a quick run-down of the versions:
  625  *  defined(_POSIX_SOURCE)              1003.1-1988
  626  *  _POSIX_C_SOURCE == 1                1003.1-1990
  627  *  _POSIX_C_SOURCE == 2                1003.2-1992 C Language Binding Option
  628  *  _POSIX_C_SOURCE == 199309           1003.1b-1993
  629  *  _POSIX_C_SOURCE == 199506           1003.1c-1995, 1003.1i-1995,
  630  *                                      and the omnibus ISO/IEC 9945-1: 1996
  631  *  _POSIX_C_SOURCE == 200112           1003.1-2001
  632  *  _POSIX_C_SOURCE == 200809           1003.1-2008
  633  *
  634  * In addition, the X/Open Portability Guide, which is now the Single UNIX
  635  * Specification, defines a feature-test macro which indicates the version of
  636  * that specification, and which subsumes _POSIX_C_SOURCE.
  637  *
  638  * Our macros begin with two underscores to avoid namespace screwage.
  639  */
  640 
  641 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
  642 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
  643 #undef _POSIX_C_SOURCE          /* Probably illegal, but beyond caring now. */
  644 #define _POSIX_C_SOURCE         199009
  645 #endif
  646 
  647 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
  648 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
  649 #undef _POSIX_C_SOURCE
  650 #define _POSIX_C_SOURCE         199209
  651 #endif
  652 
  653 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
  654 #ifdef _XOPEN_SOURCE
  655 #if _XOPEN_SOURCE - 0 >= 700
  656 #define __XSI_VISIBLE           700
  657 #undef _POSIX_C_SOURCE
  658 #define _POSIX_C_SOURCE         200809
  659 #elif _XOPEN_SOURCE - 0 >= 600
  660 #define __XSI_VISIBLE           600
  661 #undef _POSIX_C_SOURCE
  662 #define _POSIX_C_SOURCE         200112
  663 #elif _XOPEN_SOURCE - 0 >= 500
  664 #define __XSI_VISIBLE           500
  665 #undef _POSIX_C_SOURCE
  666 #define _POSIX_C_SOURCE         199506
  667 #endif
  668 #endif
  669 
  670 /*
  671  * Deal with all versions of POSIX.  The ordering relative to the tests above is
  672  * important.
  673  */
  674 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
  675 #define _POSIX_C_SOURCE         198808
  676 #endif
  677 #ifdef _POSIX_C_SOURCE
  678 #if _POSIX_C_SOURCE >= 200809
  679 #define __POSIX_VISIBLE         200809
  680 #define __ISO_C_VISIBLE         1999
  681 #elif _POSIX_C_SOURCE >= 200112
  682 #define __POSIX_VISIBLE         200112
  683 #define __ISO_C_VISIBLE         1999
  684 #elif _POSIX_C_SOURCE >= 199506
  685 #define __POSIX_VISIBLE         199506
  686 #define __ISO_C_VISIBLE         1990
  687 #elif _POSIX_C_SOURCE >= 199309
  688 #define __POSIX_VISIBLE         199309
  689 #define __ISO_C_VISIBLE         1990
  690 #elif _POSIX_C_SOURCE >= 199209
  691 #define __POSIX_VISIBLE         199209
  692 #define __ISO_C_VISIBLE         1990
  693 #elif _POSIX_C_SOURCE >= 199009
  694 #define __POSIX_VISIBLE         199009
  695 #define __ISO_C_VISIBLE         1990
  696 #else
  697 #define __POSIX_VISIBLE         198808
  698 #define __ISO_C_VISIBLE         0
  699 #endif /* _POSIX_C_SOURCE */
  700 #else
  701 /*-
  702  * Deal with _ANSI_SOURCE:
  703  * If it is defined, and no other compilation environment is explicitly
  704  * requested, then define our internal feature-test macros to zero.  This
  705  * makes no difference to the preprocessor (undefined symbols in preprocessing
  706  * expressions are defined to have value zero), but makes it more convenient for
  707  * a test program to print out the values.
  708  *
  709  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
  710  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
  711  * environment (and in fact we will never get here).
  712  */
  713 #if defined(_ANSI_SOURCE)       /* Hide almost everything. */
  714 #define __POSIX_VISIBLE         0
  715 #define __XSI_VISIBLE           0
  716 #define __BSD_VISIBLE           0
  717 #define __ISO_C_VISIBLE         1990
  718 #elif defined(_C99_SOURCE)      /* Localism to specify strict C99 env. */
  719 #define __POSIX_VISIBLE         0
  720 #define __XSI_VISIBLE           0
  721 #define __BSD_VISIBLE           0
  722 #define __ISO_C_VISIBLE         1999
  723 #elif defined(_C11_SOURCE)      /* Localism to specify strict C11 env. */
  724 #define __POSIX_VISIBLE         0
  725 #define __XSI_VISIBLE           0
  726 #define __BSD_VISIBLE           0
  727 #define __ISO_C_VISIBLE         2011
  728 #else                           /* Default environment: show everything. */
  729 #define __POSIX_VISIBLE         200809
  730 #define __XSI_VISIBLE           700
  731 #define __BSD_VISIBLE           1
  732 #define __ISO_C_VISIBLE         2011
  733 #endif
  734 #endif
  735 
  736 #if defined(__mips) || defined(__powerpc64__)
  737 #define __NO_TLS 1
  738 #endif
  739 
  740 #endif /* !_SYS_CDEFS_H_ */

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