xref: /dragonfly/sys/sys/cdefs.h (revision 1bf4b486)
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  * 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.
23  *
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
34  * SUCH DAMAGE.
35  *
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 1.18 2005/07/26 16:45:04 joerg Exp $
39  */
40 
41 #ifndef	_SYS_CDEFS_H_
42 #define	_SYS_CDEFS_H_
43 
44 #if defined(__cplusplus)
45 #define	__BEGIN_DECLS	extern "C" {
46 #define	__END_DECLS	}
47 #else
48 #define	__BEGIN_DECLS
49 #define	__END_DECLS
50 #endif
51 
52 /*
53  * Macro to test if we are using a specific version of gcc or later.
54  */
55 #if defined(__GNUC__) && !defined(__INTEL_COMPILER)
56 #define __GNUC_PREREQ__(ma, mi)	\
57         (__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
58 #else
59 #define __GNUC_PREREQ__(ma, mi) 0
60 #endif
61 
62 /*
63  * The __VM_CACHELINE_SIZE macro defines the common cache line alignment
64  * size that can be found across most recent and somewhat latest Intel
65  * hardware, i.e. L1 cache sizes etc.
66  *
67  * If needed, this value can be TUNED.  Suitable values for this macro
68  * are 32, 64 and 128 bytes.  The unit of measurement for this macro is
69  * bytes.
70  *
71  * XXX: This macro and related macros will eventually move to a MD
72  * header, but currently, we do need such a hierarchy.
73  */
74 #define	__VM_CACHELINE_SIZE	32
75 
76 /*
77  * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
78  * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
79  * The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
80  * mode -- there must be no spaces between its arguments, and for nested
81  * __CONCAT's, all the __CONCAT's must be at the left.  __CONCAT can also
82  * concatenate double-quoted strings produced by the __STRING macro, but
83  * this only works with ANSI C.
84  *
85  * __XSTRING is like __STRING, but it expands any macros in its argument
86  * first.  It is only available with ANSI C.
87  */
88 #if defined(__STDC__) || defined(__cplusplus)
89 #define	__P(protos)	protos		/* full-blown ANSI C */
90 #define	__CONCAT1(x,y)	x ## y
91 #define	__CONCAT(x,y)	__CONCAT1(x,y)
92 #define	__STRING(x)	#x		/* stringify without expanding x */
93 #define	__XSTRING(x)	__STRING(x)	/* expand x, then stringify */
94 
95 #define	__const		const		/* define reserved names to standard */
96 #define	__signed	signed
97 #define	__volatile	volatile
98 #if defined(__cplusplus)
99 #define	__inline	inline		/* convert to C++ keyword */
100 #else
101 #ifndef __GNUC__
102 #define	__inline			/* delete GCC keyword */
103 #endif /* !__GNUC__ */
104 #endif /* !__cplusplus */
105 
106 #else	/* !(__STDC__ || __cplusplus) */
107 #define	__P(protos)	()		/* traditional C preprocessor */
108 #define	__CONCAT(x,y)	x/**/y
109 #define	__STRING(x)	"x"
110 
111 #ifndef __GNUC__
112 #define	__const				/* delete pseudo-ANSI C keywords */
113 #define	__inline
114 #define	__signed
115 #define	__volatile
116 /*
117  * In non-ANSI C environments, new programs will want ANSI-only C keywords
118  * deleted from the program and old programs will want them left alone.
119  * When using a compiler other than gcc, programs using the ANSI C keywords
120  * const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
121  * When using "gcc -traditional", we assume that this is the intent; if
122  * __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
123  */
124 #ifndef	NO_ANSI_KEYWORDS
125 #define	const				/* delete ANSI C keywords */
126 #define	inline
127 #define	signed
128 #define	volatile
129 #endif	/* !NO_ANSI_KEYWORDS */
130 #endif	/* !__GNUC__ */
131 #endif	/* !(__STDC__ || __cplusplus) */
132 
133 /*
134  * Compiler-dependent macros to help declare dead (non-returning) and
135  * pure (no side effects) functions, and unused variables.  They are
136  * null except for versions of gcc that are known to support the features
137  * properly (old versions of gcc-2 supported the dead and pure features
138  * in a different (wrong) way).
139  */
140 #ifdef lint
141 
142 #define __dead2
143 #define	__pure
144 #define __pure2
145 #define __unused
146 #define __packed
147 #define __aligned(x)
148 #define __section(x)
149 #define __always_inline
150 #define __nonnull(x)
151 
152 #else
153 
154 #if !__GNUC_PREREQ__(2, 7)
155 #define __dead2
156 #define __pure2
157 #define __unused
158 #endif
159 
160 #if __GNUC_PREREQ__(2, 7)
161 #define __dead2		__attribute__((__noreturn__))
162 #define __pure2		__attribute__((__const__))
163 #define __unused	__attribute__((__unused__))
164 #define __packed        __attribute__((__packed__))
165 #define __aligned(x)    __attribute__((__aligned__(x)))
166 #define __section(x)    __attribute__((__section__(x)))
167 #endif
168 
169 #if __GNUC_PREREQ__(2, 96)
170 #define	__pure		__attribute__((__pure__))
171 #else
172 #define	__pure		__pure2
173 #endif
174 
175 #if __GNUC_PREREQ__(3, 1)
176 #define __always_inline __attribute__((__always_inline__))
177 #else
178 #define __always_inline
179 #endif
180 
181 #if __GNUC_PREREQ__(3, 3)
182 #define __nonnull(x)    __attribute__((__nonnull__(x)))
183 #define	__used		__attribute__((__used__))
184 #else
185 #define __nonnull(x)
186 #define __used		__unused
187 #endif
188 
189 #endif	/* LINT */
190 
191 #if !__GNUC_PREREQ__(2, 7) && __STDC_VERSION < 199901
192 #define __func__        NULL
193 #endif
194 
195 #if (__GNUC_PREREQ__(2, 0) && !defined(__STRICT_ANSI)) || \
196     __STDC_VERSION__ >= 199901
197 #define	__LONG_LONG_SUPPORTED
198 #endif
199 
200 /*
201  * GCC 2.95 and later provides `__restrict' as an extention to C90 to support
202  * the C99-specific `restrict' type qualifier.  We happen to use `__restrict'
203  * as a way to define the `restrict' type qualifier without disturbing older
204  * software that is unaware of C99 keywords.
205  */
206 #if !__GNUC_PREREQ__(2, 95)
207 #if __STDC_VERSION__ < 199901
208 #define	__restrict
209 #else
210 #define	__restrict	restrict
211 #endif
212 #endif
213 
214 /*
215  * Compiler-dependent macros to declare that functions take printf-like
216  * or scanf-like arguments.  They are null except for versions of gcc
217  * that are known to support the features properly (old versions of gcc-2
218  * didn't permit keeping the keywords out of the application namespace).
219  *
220  * The printf0like macro for GCC 2 uses DragonFly specific compiler extensions.
221  */
222 #if !__GNUC_PREREQ__(2, 7)
223 #define	__printflike(fmtarg, firstvararg)
224 #define	__scanflike(fmtarg, firstvararg)
225 #define	__printf0like(fmtarg, firstvararg)
226 #elif __GNUC_PREREQ__(3, 0)
227 #define	__printflike(fmtarg, firstvararg) \
228             __attribute__((__nonnull__(fmtarg), \
229 			  __format__ (__printf__, fmtarg, firstvararg)))
230 #define	__printf0like(fmtarg, firstvararg) \
231             __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
232 #define	__scanflike(fmtarg, firstvararg) \
233 	    __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
234 
235 #else
236 #define	__printflike(fmtarg, firstvararg) \
237 	    __attribute__((__format__ (__printf__, fmtarg, firstvararg)))
238 #define	__printf0like(fmtarg, firstvararg) \
239 	    __attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
240 #define	__scanflike(fmtarg, firstvararg) \
241 	    __attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
242 #endif
243 
244 #if !__GNUC_PREREQ__(3, 0)
245 #define __ARRAY_ZERO	0
246 #else
247 #define __ARRAY_ZERO
248 #endif
249 
250 /*
251  * Handy GCC based macros:
252  *
253  * 	__cachealign:
254  *
255  * 	The __cachealign macro can be used for cache line aligning structures
256  * 	of small to medium size.  It aligns the particular structure or
257  * 	storage type to a system default cache line alignment, thus giving us
258  * 	a much more better cache utilization by making the hardware work at
259  * 	its best burst speeds.
260  *
261  * 	__usereg:
262  *
263  * 	The __usereg macro can/should be used when a function contains
264  * 	arguments not more than 3.  It can be very useful to us due to the
265  * 	message-passing nature of the kernel.
266  *
267  * !!NOTE - USAGE INFORMATION!!
268  *
269  * The __cachealign macro should not be used for data structures that are
270  * as big struct proc, struct vnode, struct thread, and other structs which
271  * are as big as them; simply because it will be useless in that case.
272  *
273  * The __usereg macro should be used whenever possible, i.e., when a function
274  * does not exceed more than 3 arguments, and should not be used for vararg
275  * type functions.
276  *
277  * In other words, AVOID MISUSE OF THESE MACROS. :-)
278  */
279 #ifdef __GNUC__
280 #define	__cachealign	__attribute__((__aligned__(__VM_CACHELINE_SIZE)))
281 #define	__usereg     	__attribute__((__regparm__(3)))
282 #else
283 #define	__cachealign
284 #define	__usereg
285 #endif
286 
287 #ifdef __GNUC__
288 #define __strong_reference(sym,aliassym)	\
289 	extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)));
290 #define	__weak_reference(sym,alias)	\
291 	__asm__(".weak " #alias);	\
292 	__asm__(".equ "  #alias ", " #sym)
293 #define	__warn_references(sym,msg)	\
294 	__asm__(".section .gnu.warning." #sym);	\
295 	__asm__(".asciz \"" msg "\"");	\
296 	__asm__(".previous")
297 #endif	/* __GNUC__ */
298 
299 #if defined(__GNUC__)
300 #define	__IDSTRING(name,string)	__asm__(".ident\t\"" string "\"")
301 #endif
302 
303 #ifndef	__RCSID
304 #define	__RCSID(s)	__IDSTRING(rcsid,s)
305 #endif
306 
307 #ifndef	__RCSID_SOURCE
308 #define	__RCSID_SOURCE(s) __IDSTRING(rcsid_source,s)
309 #endif
310 
311 #ifndef	__COPYRIGHT
312 #define	__COPYRIGHT(s)	__IDSTRING(copyright,s)
313 #endif
314 
315 #ifndef	__DECONST
316 #define	__DECONST(type, var)	((type)(uintptr_t)(const void *)(var))
317 #endif
318 
319 #ifndef	__DEVOLATILE
320 #define	__DEVOLATILE(type, var)	((type)(uintptr_t)(volatile void *)(var))
321 #endif
322 
323 #ifndef	__DEQUALIFY
324 #define	__DEQUALIFY(type, var)	((type)(uintptr_t)(const volatile void *)(var))
325 #endif
326 
327 /*-
328  * The following definitions are an extension of the behavior originally
329  * implemented in <sys/_posix.h>, but with a different level of granularity.
330  * POSIX.1 requires that the macros we test be defined before any standard
331  * header file is included.
332  *
333  * Here's a quick run-down of the versions:
334  *  defined(_POSIX_SOURCE)		1003.1-1988
335  *  _POSIX_C_SOURCE == 1		1003.1-1990
336  *  _POSIX_C_SOURCE == 2		1003.2-1992 C Language Binding Option
337  *  _POSIX_C_SOURCE == 199309		1003.1b-1993
338  *  _POSIX_C_SOURCE == 199506		1003.1c-1995, 1003.1i-1995,
339  *					and the omnibus ISO/IEC 9945-1: 1996
340  *  _POSIX_C_SOURCE == 200112		1003.1-2001
341  *
342  * In addition, the X/Open Portability Guide, which is now the Single UNIX
343  * Specification, defines a feature-test macro which indicates the version of
344  * that specification, and which subsumes _POSIX_C_SOURCE.
345  *
346  * Our macros begin with two underscores to avoid namespace screwage.
347  */
348 
349 /*
350  * If no special macro was specified, make the DragonFly extensions
351  * available. Also make them available when requested so.
352  */
353 #if (!defined(_POSIX_C_SOURCE) && !defined(_XOPEN_SOURCE) && \
354     !defined(_ANSI_SOURCE) && !defined(_C99_SOURCE)) || \
355     defined(_DRAGONFLY_SOURCE) || defined(_NETBSD_SOURCE)
356 #define __DF_VISIBLE	1
357 #else
358 #define __DF_VISIBLE	0
359 #endif
360 
361 #if defined(_POSIX_C_SOURCE)
362 
363 /* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
364 #if _POSIX_C_SOURCE == 1
365 #undef _POSIX_C_SOURCE		/* Probably illegal, but beyond caring now. */
366 #define	_POSIX_C_SOURCE		199009
367 #endif
368 
369 /* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
370 #if _POSIX_C_SOURCE == 2
371 #undef _POSIX_C_SOURCE
372 #define	_POSIX_C_SOURCE		199209
373 #endif
374 
375 #endif	/* _POSIX_C_SOURCE */
376 
377 /* Deal with various X/Open Portability Guides and Single UNIX Spec. */
378 #ifdef _XOPEN_SOURCE
379 #if _XOPEN_SOURCE - 0 >= 600
380 #define	__XSI_VISIBLE		600
381 #undef _POSIX_C_SOURCE
382 #define	_POSIX_C_SOURCE		200112
383 #elif _XOPEN_SOURCE - 0 >= 500
384 #define	__XSI_VISIBLE		500
385 #undef _POSIX_C_SOURCE
386 #define	_POSIX_C_SOURCE		199506
387 #endif
388 #endif
389 
390 /*
391  * Deal with all versions of POSIX.  The ordering relative to the tests above is
392  * important.
393  */
394 #if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
395 #define	_POSIX_C_SOURCE		198808
396 #endif
397 #ifdef _POSIX_C_SOURCE
398 #if _POSIX_C_SOURCE >= 200112
399 #define	__POSIX_VISIBLE		200112
400 #define	__ISO_C_VISIBLE		1999
401 #elif _POSIX_C_SOURCE >= 199506
402 #define	__POSIX_VISIBLE		199506
403 #define	__ISO_C_VISIBLE		1990
404 #elif _POSIX_C_SOURCE >= 199309
405 #define	__POSIX_VISIBLE		199309
406 #define	__ISO_C_VISIBLE		1990
407 #elif _POSIX_C_SOURCE >= 199209
408 #define	__POSIX_VISIBLE		199209
409 #define	__ISO_C_VISIBLE		1990
410 #elif _POSIX_C_SOURCE >= 199009
411 #define	__POSIX_VISIBLE		199009
412 #define	__ISO_C_VISIBLE		1990
413 #else
414 #define	__POSIX_VISIBLE		198808
415 #define	__ISO_C_VISIBLE		0
416 #endif /* _POSIX_C_SOURCE */
417 #else
418 /*-
419  * Deal with _ANSI_SOURCE:
420  * If it is defined, and no other compilation environment is explicitly
421  * requested, then define our internal feature-test macros to zero.  This
422  * makes no difference to the preprocessor (undefined symbols in preprocessing
423  * expressions are defined to have value zero), but makes it more convenient for
424  * a test program to print out the values.
425  *
426  * If a program mistakenly defines _ANSI_SOURCE and some other macro such as
427  * _POSIX_C_SOURCE, we will assume that it wants the broader compilation
428  * environment (and in fact we will never get here).
429  */
430 #ifdef _ANSI_SOURCE		/* Hide almost everything. */
431 #define	__POSIX_VISIBLE		0
432 #define	__XSI_VISIBLE		0
433 #define	__BSD_VISIBLE		0
434 #define	__ISO_C_VISIBLE		1990
435 #elif defined(_C99_SOURCE)	/* Localism to specify strict C99 env. */
436 #define	__POSIX_VISIBLE		0
437 #define	__XSI_VISIBLE		0
438 #define	__BSD_VISIBLE		0
439 #define	__ISO_C_VISIBLE		1999
440 #else				/* Default environment: show everything. */
441 #define	__POSIX_VISIBLE		200112
442 #define	__XSI_VISIBLE		600
443 #define	__BSD_VISIBLE		1
444 #define	__ISO_C_VISIBLE		1999
445 #endif
446 #endif
447 
448 #endif /* !_SYS_CDEFS_H_ */
449