2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Berkeley Software Design, Inc.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)cdefs.h 8.8 (Berkeley) 1/9/95
37 * $FreeBSD: src/sys/sys/cdefs.h,v 1.28.2.8 2002/09/18 04:05:13 mikeh Exp $
38 * $DragonFly: src/sys/sys/cdefs.h,v 1.20 2008/11/20 11:27:24 hasso Exp $
45 #define __exported __attribute__((__visibility__("default")))
50 #if defined(__cplusplus)
51 #define __BEGIN_DECLS extern "C" {
59 * Macro to test if we are using a specific version of gcc or later.
61 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
62 #define __GNUC_PREREQ__(ma, mi) \
63 (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
65 #define __GNUC_PREREQ__(ma, mi) 0
69 * The __VM_CACHELINE_SIZE macro defines the common cache line alignment
70 * size that can be found across most recent and somewhat latest Intel
71 * hardware, i.e. L1 cache sizes etc.
73 * If needed, this value can be TUNED. Suitable values for this macro
74 * are 32, 64 and 128 bytes. The unit of measurement for this macro is
77 * XXX: This macro and related macros will eventually move to a MD
78 * header, but currently, we do need such a hierarchy.
80 #define __VM_CACHELINE_SIZE 64
81 #define __VM_CACHELINE_ALIGN(n) \
82 (((n) + __VM_CACHELINE_SIZE - 1) / __VM_CACHELINE_SIZE)
85 * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
86 * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
87 * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
88 * mode -- there must be no spaces between its arguments, and for nested
89 * __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also
90 * concatenate double-quoted strings produced by the __STRING macro, but
91 * this only works with ANSI C.
93 * __XSTRING is like __STRING, but it expands any macros in its argument
94 * first. It is only available with ANSI C.
96 #if defined(__STDC__) || defined(__cplusplus)
97 #define __P(protos) protos /* full-blown ANSI C */
98 #define __CONCAT1(x,y) x ## y
99 #define __CONCAT(x,y) __CONCAT1(x,y)
100 #define __STRING(x) #x /* stringify without expanding x */
101 #define __XSTRING(x) __STRING(x) /* expand x, then stringify */
103 #define __const const /* define reserved names to standard */
104 #define __signed signed
105 #define __volatile volatile
106 #if defined(__cplusplus)
107 #define __inline inline /* convert to C++ keyword */
110 #define __inline /* delete GCC keyword */
111 #endif /* !__GNUC__ */
112 #endif /* !__cplusplus */
114 #else /* !(__STDC__ || __cplusplus) */
115 #define __P(protos) () /* traditional C preprocessor */
116 #define __CONCAT(x,y) x/**/y
117 #define __STRING(x) "x"
120 #define __const /* delete pseudo-ANSI C keywords */
125 * In non-ANSI C environments, new programs will want ANSI-only C keywords
126 * deleted from the program and old programs will want them left alone.
127 * When using a compiler other than gcc, programs using the ANSI C keywords
128 * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
129 * When using "gcc -traditional", we assume that this is the intent; if
130 * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
132 #ifndef NO_ANSI_KEYWORDS
133 #define const /* delete ANSI C keywords */
137 #endif /* !NO_ANSI_KEYWORDS */
138 #endif /* !__GNUC__ */
139 #endif /* !(__STDC__ || __cplusplus) */
142 * Compiler-dependent macros to help declare dead (non-returning) and
143 * pure (no side effects) functions, and unused variables. They are
144 * null except for versions of gcc that are known to support the features
145 * properly (old versions of gcc-2 supported the dead and pure features
146 * in a different (wrong) way).
157 #define __always_inline
162 #if !__GNUC_PREREQ__(2, 7)
168 #if __GNUC_PREREQ__(2, 7)
169 #define __dead2 __attribute__((__noreturn__))
170 #define __pure2 __attribute__((__const__))
171 #define __unused __attribute__((__unused__))
172 #define __packed __attribute__((__packed__))
173 #define __aligned(x) __attribute__((__aligned__(x)))
174 #define __section(x) __attribute__((__section__(x)))
177 #if __GNUC_PREREQ__(2, 96)
178 #define __pure __attribute__((__pure__))
180 #define __pure __pure2
183 #if __GNUC_PREREQ__(3, 1)
184 #define __always_inline __attribute__((__always_inline__))
185 #define __noinline __attribute__((__noinline__))
187 #define __always_inline
191 #if __GNUC_PREREQ__(3, 3)
192 #define __nonnull(x) __attribute__((__nonnull__(x)))
193 #define __used __attribute__((__used__))
196 #define __used __unused
201 #if !__GNUC_PREREQ__(2, 7) && __STDC_VERSION < 199901
202 #define __func__ NULL
205 #if (__GNUC_PREREQ__(2, 0) && !defined(__STRICT_ANSI)) || \
206 __STDC_VERSION__ >= 199901
207 #define __LONG_LONG_SUPPORTED
211 * GNU C version 2.96 adds explicit branch prediction so that
212 * the CPU back-end can hint the processor and also so that
213 * code blocks can be reordered such that the predicted path
214 * sees a more linear flow, thus improving cache behavior, etc.
216 * The following two macros provide us with a way to utilize this
217 * compiler feature. Use __predict_true() if you expect the expression
218 * to evaluate to true, and __predict_false() if you expect the
219 * expression to evaluate to false.
221 * A few notes about usage:
223 * * Generally, __predict_false() error condition checks (unless
224 * you have some _strong_ reason to do otherwise, in which case
225 * document it), and/or __predict_true() `no-error' condition
226 * checks, assuming you want to optimize for the no-error case.
228 * * Other than that, if you don't know the likelihood of a test
229 * succeeding from empirical or other `hard' evidence, don't
232 * * These are meant to be used in places that are run `a lot'.
233 * It is wasteful to make predictions in code that is run
234 * seldomly (e.g. at subsystem initialization time) as the
235 * basic block reordering that this affects can often generate
238 #if __GNUC_PREREQ__(2, 96)
239 #define __predict_true(exp) __builtin_expect((exp), 1)
240 #define __predict_false(exp) __builtin_expect((exp), 0)
242 #define __predict_true(exp) (exp)
243 #define __predict_false(exp) (exp)
247 * GCC 2.95 and later provides `__restrict' as an extention to C90 to support
248 * the C99-specific `restrict' type qualifier. We happen to use `__restrict'
249 * as a way to define the `restrict' type qualifier without disturbing older
250 * software that is unaware of C99 keywords.
252 #if !__GNUC_PREREQ__(2, 95)
253 #if __STDC_VERSION__ < 199901
256 #define __restrict restrict
261 * Compiler-dependent macros to declare that functions take printf-like
262 * or scanf-like arguments. They are null except for versions of gcc
263 * that are known to support the features properly (old versions of gcc-2
264 * didn't permit keeping the keywords out of the application namespace).
266 * The printf0like macro for GCC 2 uses DragonFly specific compiler extensions.
268 #if !__GNUC_PREREQ__(2, 7)
269 #define __printflike(fmtarg, firstvararg)
270 #define __scanflike(fmtarg, firstvararg)
271 #define __printf0like(fmtarg, firstvararg)
272 #define __format_arg(fmtarg)
273 #elif __GNUC_PREREQ__(3, 0)
274 #define __printflike(fmtarg, firstvararg) \
275 __attribute__((__nonnull__(fmtarg), \
276 __format__ (__printf__, fmtarg, firstvararg)))
277 #define __printf0like(fmtarg, firstvararg) \
278 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
279 #define __scanflike(fmtarg, firstvararg) \
280 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
281 #define __format_arg(fmtarg) \
282 __attribute__((__format_arg__ (fmtarg)))
285 #define __printflike(fmtarg, firstvararg) \
286 __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
287 #define __printf0like(fmtarg, firstvararg) \
288 __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
289 #define __scanflike(fmtarg, firstvararg) \
290 __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
291 #define __format_arg(fmtarg) \
292 __attribute__((__format_arg__ (fmtarg)))
296 #if !__GNUC_PREREQ__(3, 0)
297 #define __ARRAY_ZERO 0
303 * A convenient constructor macro, GCC 4.3.0 added priority support to
304 * constructors, provide a compatible interface for both.
306 #if __GNUC_PREREQ__(4, 3)
307 #define __constructor(prio) __attribute__((constructor(prio)))
309 #define __constructor(prio) __attribute__((constructor))
313 * Handy GCC based macros:
317 * The __cachealign macro can be used for cache line aligning structures
318 * of small to medium size. It aligns the particular structure or
319 * storage type to a system default cache line alignment, thus giving us
320 * a much more better cache utilization by making the hardware work at
321 * its best burst speeds.
325 * The __usereg macro can/should be used when a function contains
326 * arguments not more than 3. It can be very useful to us due to the
327 * message-passing nature of the kernel.
329 * !!NOTE - USAGE INFORMATION!!
331 * The __cachealign macro should not be used for data structures that are
332 * as big struct proc, struct vnode, struct thread, and other structs which
333 * are as big as them; simply because it will be useless in that case.
335 * The __usereg macro should be used whenever possible, i.e., when a function
336 * does not exceed more than 3 arguments, and should not be used for vararg
339 * In other words, AVOID MISUSE OF THESE MACROS. :-)
342 #define __cachealign __attribute__((__aligned__(__VM_CACHELINE_SIZE)))
343 #define __usereg __attribute__((__regparm__(3)))
350 #define __strong_reference(sym,aliassym) \
351 extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)));
352 #define __weak_reference(sym,alias) \
353 __asm__(".weak " #alias); \
354 __asm__(".equ " #alias ", " #sym)
355 #define __warn_references(sym,msg) \
356 __asm__(".section .gnu.warning." #sym); \
357 __asm__(".asciz \"" msg "\""); \
359 #endif /* __GNUC__ */
361 #if defined(__GNUC__)
362 #define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
366 #define __RCSID(s) __IDSTRING(rcsid,s)
369 #ifndef __RCSID_SOURCE
370 #define __RCSID_SOURCE(s) __IDSTRING(rcsid_source,s)
374 #define __COPYRIGHT(s) __IDSTRING(copyright,s)
378 #define __DECONST(type, var) ((type)(uintptr_t)(const void *)(var))
382 #define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var))
386 #define __DEQUALIFY(type, var) ((type)(uintptr_t)(const volatile void *)(var))
390 * The following definitions are an extension of the behavior originally
391 * implemented in <sys/_posix.h>, but with a different level of granularity.
392 * POSIX.1 requires that the macros we test be defined before any standard
393 * header file is included.
395 * Here's a quick run-down of the versions:
396 * defined(_POSIX_SOURCE) 1003.1-1988
397 * _POSIX_C_SOURCE == 1 1003.1-1990
398 * _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option
399 * _POSIX_C_SOURCE == 199309 1003.1b-1993
400 * _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995,
401 * and the omnibus ISO/IEC 9945-1: 1996
402 * _POSIX_C_SOURCE == 200112 1003.1-2001
403 * _POSIX_C_SOURCE == 200809 1003.1-2008
405 * In addition, the X/Open Portability Guide, which is now the Single UNIX
406 * Specification, defines a feature-test macro which indicates the version of
407 * that specification, and which subsumes _POSIX_C_SOURCE.
409 * Our macros begin with two underscores to avoid namespace screwage.
413 * If no special macro was specified, make the DragonFly extensions
414 * available. Also make them available when requested so.
416 #if (!defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE) && \
417 !defined(_ANSI_SOURCE) && !defined(_C99_SOURCE)) || \
418 defined(_DRAGONFLY_SOURCE) || defined(_NETBSD_SOURCE)
419 #define __DF_VISIBLE 1
421 #define __DF_VISIBLE 0
424 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
425 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 1
426 #undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
427 #define _POSIX_C_SOURCE 199009
430 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
431 #if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE - 0) == 2
432 #undef _POSIX_C_SOURCE
433 #define _POSIX_C_SOURCE 199209
436 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
438 #if _XOPEN_SOURCE - 0 >= 700
439 #define __XSI_VISIBLE 700
440 #undef _POSIX_C_SOURCE
441 #define _POSIX_C_SOURCE 200809
442 #elif _XOPEN_SOURCE - 0 >= 600
443 #define __XSI_VISIBLE 600
444 #undef _POSIX_C_SOURCE
445 #define _POSIX_C_SOURCE 200112
446 #elif _XOPEN_SOURCE - 0 >= 500
447 #define __XSI_VISIBLE 500
448 #undef _POSIX_C_SOURCE
449 #define _POSIX_C_SOURCE 199506
454 * Deal with all versions of POSIX. The ordering relative to the tests above is
457 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
458 #define _POSIX_C_SOURCE 198808
460 #ifdef _POSIX_C_SOURCE
461 #if (_POSIX_C_SOURCE - 0) >= 200809
462 #define __POSIX_VISIBLE 200809
463 #define __ISO_C_VISIBLE 1999
464 #elif (_POSIX_C_SOURCE - 0) >= 200112
465 #define __POSIX_VISIBLE 200112
466 #define __ISO_C_VISIBLE 1999
467 #elif (_POSIX_C_SOURCE - 0) >= 199506
468 #define __POSIX_VISIBLE 199506
469 #define __ISO_C_VISIBLE 1990
470 #elif (_POSIX_C_SOURCE - 0) >= 199309
471 #define __POSIX_VISIBLE 199309
472 #define __ISO_C_VISIBLE 1990
473 #elif (_POSIX_C_SOURCE - 0) >= 199209
474 #define __POSIX_VISIBLE 199209
475 #define __ISO_C_VISIBLE 1990
476 #elif (_POSIX_C_SOURCE - 0) >= 199009
477 #define __POSIX_VISIBLE 199009
478 #define __ISO_C_VISIBLE 1990
480 #define __POSIX_VISIBLE 198808
481 #define __ISO_C_VISIBLE 0
482 #endif /* _POSIX_C_SOURCE */
485 * Deal with _ANSI_SOURCE:
486 * If it is defined, and no other compilation environment is explicitly
487 * requested, then define our internal feature-test macros to zero. This
488 * makes no difference to the preprocessor (undefined symbols in preprocessing
489 * expressions are defined to have value zero), but makes it more convenient for
490 * a test program to print out the values.
492 * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
493 * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
494 * environment (and in fact we will never get here).
496 #ifdef _ANSI_SOURCE /* Hide almost everything. */
497 #define __POSIX_VISIBLE 0
498 #define __XSI_VISIBLE 0
499 #define __BSD_VISIBLE 0
500 #define __ISO_C_VISIBLE 1990
501 #elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
502 #define __POSIX_VISIBLE 0
503 #define __XSI_VISIBLE 0
504 #define __BSD_VISIBLE 0
505 #define __ISO_C_VISIBLE 1999
506 #else /* Default environment: show everything. */
507 #define __POSIX_VISIBLE 200112
508 #define __XSI_VISIBLE 600
509 #define __BSD_VISIBLE 1
510 #define __ISO_C_VISIBLE 1999
515 * GLOBL macro exists to preserve __start_set_* and __stop_set_* sections
516 * of kernel modules which are discarded from binutils 2.17.50+ otherwise.
519 #define __GLOBL1(sym) __asm__(".globl " #sym)
520 #define __GLOBL(sym) __GLOBL1(sym)
522 #endif /* !_SYS_CDEFS_H_ */