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/11.1/sys/sys/cdefs.h 317342 2017-04-23 20:32:46Z kib $
   34  */
   35 
   36 #ifndef _SYS_CDEFS_H_
   37 #define _SYS_CDEFS_H_
   38 
   39 /*
   40  * Testing against Clang-specific extensions.
   41  */
   42 #ifndef __has_attribute
   43 #define __has_attribute(x)      0
   44 #endif
   45 #ifndef __has_extension
   46 #define __has_extension         __has_feature
   47 #endif
   48 #ifndef __has_feature
   49 #define __has_feature(x)        0
   50 #endif
   51 #ifndef __has_include
   52 #define __has_include(x)        0
   53 #endif
   54 #ifndef __has_builtin
   55 #define __has_builtin(x)        0
   56 #endif
   57 
   58 #if defined(__cplusplus)
   59 #define __BEGIN_DECLS   extern "C" {
   60 #define __END_DECLS     }
   61 #else
   62 #define __BEGIN_DECLS
   63 #define __END_DECLS
   64 #endif
   65 
   66 /*
   67  * This code has been put in place to help reduce the addition of
   68  * compiler specific defines in FreeBSD code.  It helps to aid in
   69  * having a compiler-agnostic source tree.
   70  */
   71 
   72 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
   73 
   74 #if __GNUC__ >= 3 || defined(__INTEL_COMPILER)
   75 #define __GNUCLIKE_ASM 3
   76 #define __GNUCLIKE_MATH_BUILTIN_CONSTANTS
   77 #else
   78 #define __GNUCLIKE_ASM 2
   79 #endif
   80 #define __GNUCLIKE___TYPEOF 1
   81 #define __GNUCLIKE___OFFSETOF 1
   82 #define __GNUCLIKE___SECTION 1
   83 
   84 #ifndef __INTEL_COMPILER
   85 #define __GNUCLIKE_CTOR_SECTION_HANDLING 1
   86 #endif
   87 
   88 #define __GNUCLIKE_BUILTIN_CONSTANT_P 1
   89 #if defined(__INTEL_COMPILER) && defined(__cplusplus) && \
   90    __INTEL_COMPILER < 800
   91 #undef __GNUCLIKE_BUILTIN_CONSTANT_P
   92 #endif
   93 
   94 #if (__GNUC_MINOR__ > 95 || __GNUC__ >= 3)
   95 #define __GNUCLIKE_BUILTIN_VARARGS 1
   96 #define __GNUCLIKE_BUILTIN_STDARG 1
   97 #define __GNUCLIKE_BUILTIN_VAALIST 1
   98 #endif
   99 
  100 #if defined(__GNUC__)
  101 #define __GNUC_VA_LIST_COMPATIBILITY 1
  102 #endif
  103 
  104 /*
  105  * Compiler memory barriers, specific to gcc and clang.
  106  */
  107 #if defined(__GNUC__)
  108 #define __compiler_membar()     __asm __volatile(" " : : : "memory")
  109 #endif
  110 
  111 #ifndef __INTEL_COMPILER
  112 #define __GNUCLIKE_BUILTIN_NEXT_ARG 1
  113 #define __GNUCLIKE_MATH_BUILTIN_RELOPS
  114 #endif
  115 
  116 #define __GNUCLIKE_BUILTIN_MEMCPY 1
  117 
  118 /* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */
  119 #define __CC_SUPPORTS_INLINE 1
  120 #define __CC_SUPPORTS___INLINE 1
  121 #define __CC_SUPPORTS___INLINE__ 1
  122 
  123 #define __CC_SUPPORTS___FUNC__ 1
  124 #define __CC_SUPPORTS_WARNING 1
  125 
  126 #define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
  127 
  128 #define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
  129 
  130 #endif /* __GNUC__ || __INTEL_COMPILER */
  131 
  132 /*
  133  * Macro to test if we're using a specific version of gcc or later.
  134  */
  135 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
  136 #define __GNUC_PREREQ__(ma, mi) \
  137         (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
  138 #else
  139 #define __GNUC_PREREQ__(ma, mi) 0
  140 #endif
  141 
  142 /*
  143  * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
  144  * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
  145  * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
  146  * mode -- there must be no spaces between its arguments, and for nested
  147  * __CONCAT's, all the __CONCAT's must be at the left.  __CONCAT can also
  148  * concatenate double-quoted strings produced by the __STRING macro, but
  149  * this only works with ANSI C.
  150  *
  151  * __XSTRING is like __STRING, but it expands any macros in its argument
  152  * first.  It is only available with ANSI C.
  153  */
  154 #if defined(__STDC__) || defined(__cplusplus)
  155 #define __P(protos)     protos          /* full-blown ANSI C */
  156 #define __CONCAT1(x,y)  x ## y
  157 #define __CONCAT(x,y)   __CONCAT1(x,y)
  158 #define __STRING(x)     #x              /* stringify without expanding x */
  159 #define __XSTRING(x)    __STRING(x)     /* expand x, then stringify */
  160 
  161 #define __const         const           /* define reserved names to standard */
  162 #define __signed        signed
  163 #define __volatile      volatile
  164 #if defined(__cplusplus)
  165 #define __inline        inline          /* convert to C++ keyword */
  166 #else
  167 #if !(defined(__CC_SUPPORTS___INLINE))
  168 #define __inline                        /* delete GCC keyword */
  169 #endif /* ! __CC_SUPPORTS___INLINE */
  170 #endif /* !__cplusplus */
  171 
  172 #else   /* !(__STDC__ || __cplusplus) */
  173 #define __P(protos)     ()              /* traditional C preprocessor */
  174 #define __CONCAT(x,y)   x/**/y
  175 #define __STRING(x)     "x"
  176 
  177 #if !defined(__CC_SUPPORTS___INLINE)
  178 #define __const                         /* delete pseudo-ANSI C keywords */
  179 #define __inline
  180 #define __signed
  181 #define __volatile
  182 /*
  183  * In non-ANSI C environments, new programs will want ANSI-only C keywords
  184  * deleted from the program and old programs will want them left alone.
  185  * When using a compiler other than gcc, programs using the ANSI C keywords
  186  * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
  187  * When using "gcc -traditional", we assume that this is the intent; if
  188  * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
  189  */
  190 #ifndef NO_ANSI_KEYWORDS
  191 #define const                           /* delete ANSI C keywords */
  192 #define inline
  193 #define signed
  194 #define volatile
  195 #endif  /* !NO_ANSI_KEYWORDS */
  196 #endif  /* !__CC_SUPPORTS___INLINE */
  197 #endif  /* !(__STDC__ || __cplusplus) */
  198 
  199 /*
  200  * Compiler-dependent macros to help declare dead (non-returning) and
  201  * pure (no side effects) functions, and unused variables.  They are
  202  * null except for versions of gcc that are known to support the features
  203  * properly (old versions of gcc-2 supported the dead and pure features
  204  * in a different (wrong) way).  If we do not provide an implementation
  205  * for a given compiler, let the compile fail if it is told to use
  206  * a feature that we cannot live without.
  207  */
  208 #ifdef lint
  209 #define __dead2
  210 #define __pure2
  211 #define __unused
  212 #define __packed
  213 #define __aligned(x)
  214 #define __alloc_align(x)
  215 #define __alloc_size(x)
  216 #define __section(x)
  217 #define __weak_symbol
  218 #else
  219 #define __weak_symbol   __attribute__((__weak__))
  220 #if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
  221 #define __dead2
  222 #define __pure2
  223 #define __unused
  224 #endif
  225 #if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
  226 #define __dead2         __attribute__((__noreturn__))
  227 #define __pure2         __attribute__((__const__))
  228 #define __unused
  229 /* XXX Find out what to do for __packed, __aligned and __section */
  230 #endif
  231 #if __GNUC_PREREQ__(2, 7) || defined(__INTEL_COMPILER)
  232 #define __dead2         __attribute__((__noreturn__))
  233 #define __pure2         __attribute__((__const__))
  234 #define __unused        __attribute__((__unused__))
  235 #define __used          __attribute__((__used__))
  236 #define __packed        __attribute__((__packed__))
  237 #define __aligned(x)    __attribute__((__aligned__(x)))
  238 #define __section(x)    __attribute__((__section__(x)))
  239 #endif
  240 #if __GNUC_PREREQ__(4, 3) || __has_attribute(__alloc_size__)
  241 #define __alloc_size(x) __attribute__((__alloc_size__(x)))
  242 #else
  243 #define __alloc_size(x)
  244 #endif
  245 #if __GNUC_PREREQ__(4, 9) || __has_attribute(__alloc_align__)
  246 #define __alloc_align(x)        __attribute__((__alloc_align__(x)))
  247 #else
  248 #define __alloc_align(x)
  249 #endif
  250 #endif /* lint */
  251 
  252 #if !__GNUC_PREREQ__(2, 95)
  253 #define __alignof(x)    __offsetof(struct { char __a; x __b; }, __b)
  254 #endif
  255 
  256 /*
  257  * Keywords added in C11.
  258  */
  259 
  260 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L || defined(lint)
  261 
  262 #if !__has_extension(c_alignas)
  263 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
  264     __has_extension(cxx_alignas)
  265 #define _Alignas(x)             alignas(x)
  266 #else
  267 /* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */
  268 #define _Alignas(x)             __aligned(x)
  269 #endif
  270 #endif
  271 
  272 #if defined(__cplusplus) && __cplusplus >= 201103L
  273 #define _Alignof(x)             alignof(x)
  274 #else
  275 #define _Alignof(x)             __alignof(x)
  276 #endif
  277 
  278 #if !defined(__cplusplus) && !__has_extension(c_atomic) && \
  279     !__has_extension(cxx_atomic)
  280 /*
  281  * No native support for _Atomic(). Place object in structure to prevent
  282  * most forms of direct non-atomic access.
  283  */
  284 #define _Atomic(T)              struct { T volatile __val; }
  285 #endif
  286 
  287 #if defined(__cplusplus) && __cplusplus >= 201103L
  288 #define _Noreturn               [[noreturn]]
  289 #else
  290 #define _Noreturn               __dead2
  291 #endif
  292 
  293 #if !__has_extension(c_static_assert)
  294 #if (defined(__cplusplus) && __cplusplus >= 201103L) || \
  295     __has_extension(cxx_static_assert)
  296 #define _Static_assert(x, y)    static_assert(x, y)
  297 #elif __GNUC_PREREQ__(4,6)
  298 /* Nothing, gcc 4.6 and higher has _Static_assert built-in */
  299 #elif defined(__COUNTER__)
  300 #define _Static_assert(x, y)    __Static_assert(x, __COUNTER__)
  301 #define __Static_assert(x, y)   ___Static_assert(x, y)
  302 #define ___Static_assert(x, y)  typedef char __assert_ ## y[(x) ? 1 : -1] \
  303                                 __unused
  304 #else
  305 #define _Static_assert(x, y)    struct __hack
  306 #endif
  307 #endif
  308 
  309 #if !__has_extension(c_thread_local)
  310 /*
  311  * XXX: Some compilers (Clang 3.3, GCC 4.7) falsely announce C++11 mode
  312  * without actually supporting the thread_local keyword. Don't check for
  313  * the presence of C++11 when defining _Thread_local.
  314  */
  315 #if /* (defined(__cplusplus) && __cplusplus >= 201103L) || */ \
  316     __has_extension(cxx_thread_local)
  317 #define _Thread_local           thread_local
  318 #else
  319 #define _Thread_local           __thread
  320 #endif
  321 #endif
  322 
  323 #endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
  324 
  325 /*
  326  * Emulation of C11 _Generic().  Unlike the previously defined C11
  327  * keywords, it is not possible to implement this using exactly the same
  328  * syntax.  Therefore implement something similar under the name
  329  * __generic().  Unlike _Generic(), this macro can only distinguish
  330  * between a single type, so it requires nested invocations to
  331  * distinguish multiple cases.
  332  */
  333 
  334 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
  335     __has_extension(c_generic_selections)
  336 #define __generic(expr, t, yes, no)                                     \
  337         _Generic(expr, t: yes, default: no)
  338 #elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
  339 #define __generic(expr, t, yes, no)                                     \
  340         __builtin_choose_expr(                                          \
  341             __builtin_types_compatible_p(__typeof(expr), t), yes, no)
  342 #endif
  343 
  344 /*
  345  * C99 Static array indices in function parameter declarations.  Syntax such as:
  346  * void bar(int myArray[static 10]);
  347  * is allowed in C99 but not in C++.  Define __min_size appropriately so
  348  * headers using it can be compiled in either language.  Use like this:
  349  * void bar(int myArray[__min_size(10)]);
  350  */
  351 #if !defined(__cplusplus) && \
  352     (defined(__clang__) || __GNUC_PREREQ__(4, 6)) && \
  353     (!defined(__STDC_VERSION__) || (__STDC_VERSION__ >= 199901))
  354 #define __min_size(x)   static (x)
  355 #else
  356 #define __min_size(x)   (x)
  357 #endif
  358 
  359 #if __GNUC_PREREQ__(2, 96)
  360 #define __malloc_like   __attribute__((__malloc__))
  361 #define __pure          __attribute__((__pure__))
  362 #else
  363 #define __malloc_like
  364 #define __pure
  365 #endif
  366 
  367 #if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
  368 #define __always_inline __attribute__((__always_inline__))
  369 #else
  370 #define __always_inline
  371 #endif
  372 
  373 #if __GNUC_PREREQ__(3, 1)
  374 #define __noinline      __attribute__ ((__noinline__))
  375 #else
  376 #define __noinline
  377 #endif
  378 
  379 #if __GNUC_PREREQ__(3, 3)
  380 #define __nonnull(x)    __attribute__((__nonnull__(x)))
  381 #define __nonnull_all   __attribute__((__nonnull__))
  382 #else
  383 #define __nonnull(x)
  384 #define __nonnull_all
  385 #endif
  386 
  387 #if __GNUC_PREREQ__(3, 4)
  388 #define __fastcall      __attribute__((__fastcall__))
  389 #define __result_use_check      __attribute__((__warn_unused_result__))
  390 #else
  391 #define __fastcall
  392 #define __result_use_check
  393 #endif
  394 
  395 #if __GNUC_PREREQ__(4, 1)
  396 #define __returns_twice __attribute__((__returns_twice__))
  397 #else
  398 #define __returns_twice
  399 #endif
  400 
  401 #if __GNUC_PREREQ__(4, 6) || __has_builtin(__builtin_unreachable)
  402 #define __unreachable() __builtin_unreachable()
  403 #else
  404 #define __unreachable() ((void)0)
  405 #endif
  406 
  407 /* XXX: should use `#if __STDC_VERSION__ < 199901'. */
  408 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  409 #define __func__        NULL
  410 #endif
  411 
  412 #if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
  413 #define __LONG_LONG_SUPPORTED
  414 #endif
  415 
  416 /* C++11 exposes a load of C99 stuff */
  417 #if defined(__cplusplus) && __cplusplus >= 201103L
  418 #define __LONG_LONG_SUPPORTED
  419 #ifndef __STDC_LIMIT_MACROS
  420 #define __STDC_LIMIT_MACROS
  421 #endif
  422 #ifndef __STDC_CONSTANT_MACROS
  423 #define __STDC_CONSTANT_MACROS
  424 #endif
  425 #endif
  426 
  427 /*
  428  * GCC 2.95 provides `__restrict' as an extension to C90 to support the
  429  * C99-specific `restrict' type qualifier.  We happen to use `__restrict' as
  430  * a way to define the `restrict' type qualifier without disturbing older
  431  * software that is unaware of C99 keywords.
  432  */
  433 #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
  434 #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 || defined(lint)
  435 #define __restrict
  436 #else
  437 #define __restrict      restrict
  438 #endif
  439 #endif
  440 
  441 /*
  442  * GNU C version 2.96 adds explicit branch prediction so that
  443  * the CPU back-end can hint the processor and also so that
  444  * code blocks can be reordered such that the predicted path
  445  * sees a more linear flow, thus improving cache behavior, etc.
  446  *
  447  * The following two macros provide us with a way to utilize this
  448  * compiler feature.  Use __predict_true() if you expect the expression
  449  * to evaluate to true, and __predict_false() if you expect the
  450  * expression to evaluate to false.
  451  *
  452  * A few notes about usage:
  453  *
  454  *      * Generally, __predict_false() error condition checks (unless
  455  *        you have some _strong_ reason to do otherwise, in which case
  456  *        document it), and/or __predict_true() `no-error' condition
  457  *        checks, assuming you want to optimize for the no-error case.
  458  *
  459  *      * Other than that, if you don't know the likelihood of a test
  460  *        succeeding from empirical or other `hard' evidence, don't
  461  *        make predictions.
  462  *
  463  *      * These are meant to be used in places that are run `a lot'.
  464  *        It is wasteful to make predictions in code that is run
  465  *        seldomly (e.g. at subsystem initialization time) as the
  466  *        basic block reordering that this affects can often generate
  467  *        larger code.
  468  */
  469 #if __GNUC_PREREQ__(2, 96)
  470 #define __predict_true(exp)     __builtin_expect((exp), 1)
  471 #define __predict_false(exp)    __builtin_expect((exp), 0)
  472 #else
  473 #define __predict_true(exp)     (exp)
  474 #define __predict_false(exp)    (exp)
  475 #endif
  476 
  477 #if __GNUC_PREREQ__(4, 0)
  478 #define __null_sentinel __attribute__((__sentinel__))
  479 #define __exported      __attribute__((__visibility__("default")))
  480 #define __hidden        __attribute__((__visibility__("hidden")))
  481 #else
  482 #define __null_sentinel
  483 #define __exported
  484 #define __hidden
  485 #endif
  486 
  487 /*
  488  * We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
  489  * require it.
  490  */
  491 #if __GNUC_PREREQ__(4, 1)
  492 #define __offsetof(type, field)  __builtin_offsetof(type, field)
  493 #else
  494 #ifndef __cplusplus
  495 #define __offsetof(type, field) \
  496         ((__size_t)(__uintptr_t)((const volatile void *)&((type *)0)->field))
  497 #else
  498 #define __offsetof(type, field)                                 \
  499   (__offsetof__ (reinterpret_cast <__size_t>                    \
  500                  (&reinterpret_cast <const volatile char &>     \
  501                   (static_cast<type *> (0)->field))))
  502 #endif
  503 #endif
  504 #define __rangeof(type, start, end) \
  505         (__offsetof(type, end) - __offsetof(type, start))
  506 
  507 /*
  508  * Given the pointer x to the member m of the struct s, return
  509  * a pointer to the containing structure.  When using GCC, we first
  510  * assign pointer x to a local variable, to check that its type is
  511  * compatible with member m.
  512  */
  513 #if __GNUC_PREREQ__(3, 1)
  514 #define __containerof(x, s, m) ({                                       \
  515         const volatile __typeof(((s *)0)->m) *__x = (x);                \
  516         __DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
  517 })
  518 #else
  519 #define __containerof(x, s, m)                                          \
  520         __DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
  521 #endif
  522 
  523 /*
  524  * Compiler-dependent macros to declare that functions take printf-like
  525  * or scanf-like arguments.  They are null except for versions of gcc
  526  * that are known to support the features properly (old versions of gcc-2
  527  * didn't permit keeping the keywords out of the application namespace).
  528  */
  529 #if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
  530 #define __printflike(fmtarg, firstvararg)
  531 #define __scanflike(fmtarg, firstvararg)
  532 #define __format_arg(fmtarg)
  533 #define __strfmonlike(fmtarg, firstvararg)
  534 #define __strftimelike(fmtarg, firstvararg)
  535 #else
  536 #define __printflike(fmtarg, firstvararg) \
  537             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
  538 #define __scanflike(fmtarg, firstvararg) \
  539             __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
  540 #define __format_arg(fmtarg)    __attribute__((__format_arg__ (fmtarg)))
  541 #define __strfmonlike(fmtarg, firstvararg) \
  542             __attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
  543 #define __strftimelike(fmtarg, firstvararg) \
  544             __attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
  545 #endif
  546 
  547 /* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
  548 #if defined(__FreeBSD_cc_version) && __FreeBSD_cc_version >= 300001 && \
  549     defined(__GNUC__) && !defined(__INTEL_COMPILER)
  550 #define __printf0like(fmtarg, firstvararg) \
  551             __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
  552 #else
  553 #define __printf0like(fmtarg, firstvararg)
  554 #endif
  555 
  556 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  557 #ifndef __INTEL_COMPILER
  558 #define __strong_reference(sym,aliassym)        \
  559         extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
  560 #endif
  561 #ifdef __STDC__
  562 #define __weak_reference(sym,alias)     \
  563         __asm__(".weak " #alias);       \
  564         __asm__(".equ "  #alias ", " #sym)
  565 #define __warn_references(sym,msg)      \
  566         __asm__(".section .gnu.warning." #sym); \
  567         __asm__(".asciz \"" msg "\"");  \
  568         __asm__(".previous")
  569 #define __sym_compat(sym,impl,verid)    \
  570         __asm__(".symver " #impl ", " #sym "@" #verid)
  571 #define __sym_default(sym,impl,verid)   \
  572         __asm__(".symver " #impl ", " #sym "@@" #verid)
  573 #else
  574 #define __weak_reference(sym,alias)     \
  575         __asm__(".weak alias");         \
  576         __asm__(".equ alias, sym")
  577 #define __warn_references(sym,msg)      \
  578         __asm__(".section .gnu.warning.sym"); \
  579         __asm__(".asciz \"msg\"");      \
  580         __asm__(".previous")
  581 #define __sym_compat(sym,impl,verid)    \
  582         __asm__(".symver impl, sym@verid")
  583 #define __sym_default(impl,sym,verid)   \
  584         __asm__(".symver impl, sym@@verid")
  585 #endif  /* __STDC__ */
  586 #endif  /* __GNUC__ || __INTEL_COMPILER */
  587 
  588 #define __GLOBL1(sym)   __asm__(".globl " #sym)
  589 #define __GLOBL(sym)    __GLOBL1(sym)
  590 
  591 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  592 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
  593 #else
  594 /*
  595  * The following definition might not work well if used in header files,
  596  * but it should be better than nothing.  If you want a "do nothing"
  597  * version, then it should generate some harmless declaration, such as:
  598  *    #define   __IDSTRING(name,string) struct __hack
  599  */
  600 #define __IDSTRING(name,string) static const char name[] __unused = string
  601 #endif
  602 
  603 /*
  604  * Embed the rcs id of a source file in the resulting library.  Note that in
  605  * more recent ELF binutils, we use .ident allowing the ID to be stripped.
  606  * Usage:
  607  *      __FBSDID("$FreeBSD: releng/11.1/sys/sys/cdefs.h 317342 2017-04-23 20:32:46Z kib $");
  608  */
  609 #ifndef __FBSDID
  610 #if !defined(lint) && !defined(STRIP_FBSDID)
  611 #define __FBSDID(s)     __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  612 #else
  613 #define __FBSDID(s)     struct __hack
  614 #endif
  615 #endif
  616 
  617 #ifndef __RCSID
  618 #ifndef NO__RCSID
  619 #define __RCSID(s)      __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
  620 #else
  621 #define __RCSID(s)      struct __hack
  622 #endif
  623 #endif
  624 
  625 #ifndef __RCSID_SOURCE
  626 #ifndef NO__RCSID_SOURCE
  627 #define __RCSID_SOURCE(s)       __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
  628 #else
  629 #define __RCSID_SOURCE(s)       struct __hack
  630 #endif
  631 #endif
  632 
  633 #ifndef __SCCSID
  634 #ifndef NO__SCCSID
  635 #define __SCCSID(s)     __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
  636 #else
  637 #define __SCCSID(s)     struct __hack
  638 #endif
  639 #endif
  640 
  641 #ifndef __COPYRIGHT
  642 #ifndef NO__COPYRIGHT
  643 #define __COPYRIGHT(s)  __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
  644 #else
  645 #define __COPYRIGHT(s)  struct __hack
  646 #endif
  647 #endif
  648 
  649 #ifndef __DECONST
  650 #define __DECONST(type, var)    ((type)(__uintptr_t)(const void *)(var))
  651 #endif
  652 
  653 #ifndef __DEVOLATILE
  654 #define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
  655 #endif
  656 
  657 #ifndef __DEQUALIFY
  658 #define __DEQUALIFY(type, var)  ((type)(__uintptr_t)(const volatile void *)(var))
  659 #endif
  660 
  661 /*-
  662  * The following definitions are an extension of the behavior originally
  663  * implemented in <sys/_posix.h>, but with a different level of granularity.
  664  * POSIX.1 requires that the macros we test be defined before any standard
  665  * header file is included.
  666  *
  667  * Here's a quick run-down of the versions:
  668  *  defined(_POSIX_SOURCE)              1003.1-1988
  669  *  _POSIX_C_SOURCE == 1                1003.1-1990
  670  *  _POSIX_C_SOURCE == 2                1003.2-1992 C Language Binding Option
  671  *  _POSIX_C_SOURCE == 199309           1003.1b-1993
  672  *  _POSIX_C_SOURCE == 199506           1003.1c-1995, 1003.1i-1995,
  673  *                                      and the omnibus ISO/IEC 9945-1: 1996
  674  *  _POSIX_C_SOURCE == 200112           1003.1-2001
  675  *  _POSIX_C_SOURCE == 200809           1003.1-2008
  676  *
  677  * In addition, the X/Open Portability Guide, which is now the Single UNIX
  678  * Specification, defines a feature-test macro which indicates the version of
  679  * that specification, and which subsumes _POSIX_C_SOURCE.
  680  *
  681  * Our macros begin with two underscores to avoid namespace screwage.
  682  */
  683 
  684 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
  685 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
  686 #undef _POSIX_C_SOURCE          /* Probably illegal, but beyond caring now. */
  687 #define _POSIX_C_SOURCE         199009
  688 #endif
  689 
  690 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
  691 #if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
  692 #undef _POSIX_C_SOURCE
  693 #define _POSIX_C_SOURCE         199209
  694 #endif
  695 
  696 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
  697 #ifdef _XOPEN_SOURCE
  698 #if _XOPEN_SOURCE - 0 >= 700
  699 #define __XSI_VISIBLE           700
  700 #undef _POSIX_C_SOURCE
  701 #define _POSIX_C_SOURCE         200809
  702 #elif _XOPEN_SOURCE - 0 >= 600
  703 #define __XSI_VISIBLE           600
  704 #undef _POSIX_C_SOURCE
  705 #define _POSIX_C_SOURCE         200112
  706 #elif _XOPEN_SOURCE - 0 >= 500
  707 #define __XSI_VISIBLE           500
  708 #undef _POSIX_C_SOURCE
  709 #define _POSIX_C_SOURCE         199506
  710 #endif
  711 #endif
  712 
  713 /*
  714  * Deal with all versions of POSIX.  The ordering relative to the tests above is
  715  * important.
  716  */
  717 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
  718 #define _POSIX_C_SOURCE         198808
  719 #endif
  720 #ifdef _POSIX_C_SOURCE
  721 #if _POSIX_C_SOURCE >= 200809
  722 #define __POSIX_VISIBLE         200809
  723 #define __ISO_C_VISIBLE         1999
  724 #elif _POSIX_C_SOURCE >= 200112
  725 #define __POSIX_VISIBLE         200112
  726 #define __ISO_C_VISIBLE         1999
  727 #elif _POSIX_C_SOURCE >= 199506
  728 #define __POSIX_VISIBLE         199506
  729 #define __ISO_C_VISIBLE         1990
  730 #elif _POSIX_C_SOURCE >= 199309
  731 #define __POSIX_VISIBLE         199309
  732 #define __ISO_C_VISIBLE         1990
  733 #elif _POSIX_C_SOURCE >= 199209
  734 #define __POSIX_VISIBLE         199209
  735 #define __ISO_C_VISIBLE         1990
  736 #elif _POSIX_C_SOURCE >= 199009
  737 #define __POSIX_VISIBLE         199009
  738 #define __ISO_C_VISIBLE         1990
  739 #else
  740 #define __POSIX_VISIBLE         198808
  741 #define __ISO_C_VISIBLE         0
  742 #endif /* _POSIX_C_SOURCE */
  743 #else
  744 /*-
  745  * Deal with _ANSI_SOURCE:
  746  * If it is defined, and no other compilation environment is explicitly
  747  * requested, then define our internal feature-test macros to zero.  This
  748  * makes no difference to the preprocessor (undefined symbols in preprocessing
  749  * expressions are defined to have value zero), but makes it more convenient for
  750  * a test program to print out the values.
  751  *
  752  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
  753  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
  754  * environment (and in fact we will never get here).
  755  */
  756 #if defined(_ANSI_SOURCE)       /* Hide almost everything. */
  757 #define __POSIX_VISIBLE         0
  758 #define __XSI_VISIBLE           0
  759 #define __BSD_VISIBLE           0
  760 #define __ISO_C_VISIBLE         1990
  761 #define __EXT1_VISIBLE          0
  762 #elif defined(_C99_SOURCE)      /* Localism to specify strict C99 env. */
  763 #define __POSIX_VISIBLE         0
  764 #define __XSI_VISIBLE           0
  765 #define __BSD_VISIBLE           0
  766 #define __ISO_C_VISIBLE         1999
  767 #define __EXT1_VISIBLE          0
  768 #elif defined(_C11_SOURCE)      /* Localism to specify strict C11 env. */
  769 #define __POSIX_VISIBLE         0
  770 #define __XSI_VISIBLE           0
  771 #define __BSD_VISIBLE           0
  772 #define __ISO_C_VISIBLE         2011
  773 #define __EXT1_VISIBLE          0
  774 #else                           /* Default environment: show everything. */
  775 #define __POSIX_VISIBLE         200809
  776 #define __XSI_VISIBLE           700
  777 #define __BSD_VISIBLE           1
  778 #define __ISO_C_VISIBLE         2011
  779 #define __EXT1_VISIBLE          1
  780 #endif
  781 #endif
  782 
  783 /* User override __EXT1_VISIBLE */
  784 #if defined(__STDC_WANT_LIB_EXT1__)
  785 #undef  __EXT1_VISIBLE
  786 #if __STDC_WANT_LIB_EXT1__
  787 #define __EXT1_VISIBLE          1
  788 #else
  789 #define __EXT1_VISIBLE          0
  790 #endif
  791 #endif /* __STDC_WANT_LIB_EXT1__ */
  792 
  793 #if defined(__mips) || defined(__powerpc64__) || defined(__riscv__)
  794 #define __NO_TLS 1
  795 #endif
  796 
  797 /*
  798  * Old versions of GCC use non-standard ARM arch symbols; acle-compat.h
  799  * translates them to __ARM_ARCH and the modern feature symbols defined by ARM.
  800  */
  801 #if defined(__arm__) && !defined(__ARM_ARCH)
  802 #include <machine/acle-compat.h>
  803 #endif
  804 
  805 /*
  806  * Nullability qualifiers: currently only supported by Clang.
  807  */
  808 #if !(defined(__clang__) && __has_feature(nullability))
  809 #define _Nonnull
  810 #define _Nullable
  811 #define _Null_unspecified
  812 #define __NULLABILITY_PRAGMA_PUSH
  813 #define __NULLABILITY_PRAGMA_POP
  814 #else
  815 #define __NULLABILITY_PRAGMA_PUSH _Pragma("clang diagnostic push")      \
  816         _Pragma("clang diagnostic ignored \"-Wnullability-completeness\"")
  817 #define __NULLABILITY_PRAGMA_POP _Pragma("clang diagnostic pop")
  818 #endif
  819 
  820 /*
  821  * Type Safety Checking
  822  *
  823  * Clang provides additional attributes to enable checking type safety
  824  * properties that cannot be enforced by the C type system. 
  825  */
  826 
  827 #if __has_attribute(__argument_with_type_tag__) && \
  828     __has_attribute(__type_tag_for_datatype__) && !defined(lint)
  829 #define __arg_type_tag(arg_kind, arg_idx, type_tag_idx) \
  830             __attribute__((__argument_with_type_tag__(arg_kind, arg_idx, type_tag_idx)))
  831 #define __datatype_type_tag(kind, type) \
  832             __attribute__((__type_tag_for_datatype__(kind, type)))
  833 #else
  834 #define __arg_type_tag(arg_kind, arg_idx, type_tag_idx)
  835 #define __datatype_type_tag(kind, type)
  836 #endif
  837 
  838 /*
  839  * Lock annotations.
  840  *
  841  * Clang provides support for doing basic thread-safety tests at
  842  * compile-time, by marking which locks will/should be held when
  843  * entering/leaving a functions.
  844  *
  845  * Furthermore, it is also possible to annotate variables and structure
  846  * members to enforce that they are only accessed when certain locks are
  847  * held.
  848  */
  849 
  850 #if __has_extension(c_thread_safety_attributes)
  851 #define __lock_annotate(x)      __attribute__((x))
  852 #else
  853 #define __lock_annotate(x)
  854 #endif
  855 
  856 /* Structure implements a lock. */
  857 #define __lockable              __lock_annotate(lockable)
  858 
  859 /* Function acquires an exclusive or shared lock. */
  860 #define __locks_exclusive(...) \
  861         __lock_annotate(exclusive_lock_function(__VA_ARGS__))
  862 #define __locks_shared(...) \
  863         __lock_annotate(shared_lock_function(__VA_ARGS__))
  864 
  865 /* Function attempts to acquire an exclusive or shared lock. */
  866 #define __trylocks_exclusive(...) \
  867         __lock_annotate(exclusive_trylock_function(__VA_ARGS__))
  868 #define __trylocks_shared(...) \
  869         __lock_annotate(shared_trylock_function(__VA_ARGS__))
  870 
  871 /* Function releases a lock. */
  872 #define __unlocks(...)          __lock_annotate(unlock_function(__VA_ARGS__))
  873 
  874 /* Function asserts that an exclusive or shared lock is held. */
  875 #define __asserts_exclusive(...) \
  876         __lock_annotate(assert_exclusive_lock(__VA_ARGS__))
  877 #define __asserts_shared(...) \
  878         __lock_annotate(assert_shared_lock(__VA_ARGS__))
  879 
  880 /* Function requires that an exclusive or shared lock is or is not held. */
  881 #define __requires_exclusive(...) \
  882         __lock_annotate(exclusive_locks_required(__VA_ARGS__))
  883 #define __requires_shared(...) \
  884         __lock_annotate(shared_locks_required(__VA_ARGS__))
  885 #define __requires_unlocked(...) \
  886         __lock_annotate(locks_excluded(__VA_ARGS__))
  887 
  888 /* Function should not be analyzed. */
  889 #define __no_lock_analysis      __lock_annotate(no_thread_safety_analysis)
  890 
  891 /* Guard variables and structure members by lock. */
  892 #define __guarded_by(x)         __lock_annotate(guarded_by(x))
  893 #define __pt_guarded_by(x)      __lock_annotate(pt_guarded_by(x))
  894 
  895 #endif /* !_SYS_CDEFS_H_ */

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