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freebsd-dev/sys/sys/cdefs.h
Alexander Kabaev fa034a084b Use __builtin_offsetof for GCC 4.1.
2006-09-21 01:38:58 +00:00

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/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Berkeley Software Design, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)cdefs.h 8.8 (Berkeley) 1/9/95
* $FreeBSD$
*/
#ifndef _SYS_CDEFS_H_
#define _SYS_CDEFS_H_
#if defined(__cplusplus)
#define __BEGIN_DECLS extern "C" {
#define __END_DECLS }
#else
#define __BEGIN_DECLS
#define __END_DECLS
#endif
/*
* This code has been put in place to help reduce the addition of
* compiler specific defines in FreeBSD code. It helps to aid in
* having a compiler-agnostic source tree.
*/
#if defined(__GNUC__) || defined(__INTEL_COMPILER)
#if __GNUC__ >= 3 || defined(__INTEL_COMPILER)
#define __GNUCLIKE_ASM 3
#define __GNUCLIKE_MATH_BUILTIN_CONSTANTS
#else
#define __GNUCLIKE_ASM 2
#endif
#define __GNUCLIKE___TYPEOF 1
#define __GNUCLIKE___OFFSETOF 1
#define __GNUCLIKE___SECTION 1
#define __GNUCLIKE_ATTRIBUTE_MODE_DI 1
#ifndef __INTEL_COMPILER
# define __GNUCLIKE_CTOR_SECTION_HANDLING 1
#endif
#define __GNUCLIKE_BUILTIN_CONSTANT_P 1
# if defined(__INTEL_COMPILER) && defined(__cplusplus) \
&& __INTEL_COMPILER < 800
# undef __GNUCLIKE_BUILTIN_CONSTANT_P
# endif
#if (__GNUC_MINOR__ > 95 || __GNUC__ >= 3) && !defined(__INTEL_COMPILER)
# define __GNUCLIKE_BUILTIN_VARARGS 1
# define __GNUCLIKE_BUILTIN_STDARG 1
# define __GNUCLIKE_BUILTIN_VAALIST 1
#endif
#if defined(__GNUC__)
# define __GNUC_VA_LIST_COMPATIBILITY 1
#endif
#ifndef __INTEL_COMPILER
# define __GNUCLIKE_BUILTIN_NEXT_ARG 1
# define __GNUCLIKE_MATH_BUILTIN_RELOPS
#endif
#define __GNUCLIKE_BUILTIN_MEMCPY 1
/* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */
#define __CC_SUPPORTS_INLINE 1
#define __CC_SUPPORTS___INLINE 1
#define __CC_SUPPORTS___INLINE__ 1
#define __CC_SUPPORTS___FUNC__ 1
#define __CC_SUPPORTS_WARNING 1
#define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
#define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
/* XXX: sys/dev/mpt/mpilib/mpi_type.h uses it, someone should review it */
#define __CC_INT_IS_32BIT 1
#endif /* __GNUC__ || __INTEL_COMPILER */
/*
* Macro to test if we're using a specific version of gcc or later.
*/
#if defined(__GNUC__) && !defined(__INTEL_COMPILER)
#define __GNUC_PREREQ__(ma, mi) \
(__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
#else
#define __GNUC_PREREQ__(ma, mi) 0
#endif
/*
* The __CONCAT macro is used to concatenate parts of symbol names, e.g.
* with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
* The __CONCAT macro is a bit tricky to use if it must work in non-ANSI
* mode -- there must be no spaces between its arguments, and for nested
* __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also
* concatenate double-quoted strings produced by the __STRING macro, but
* this only works with ANSI C.
*
* __XSTRING is like __STRING, but it expands any macros in its argument
* first. It is only available with ANSI C.
*/
#if defined(__STDC__) || defined(__cplusplus)
#define __P(protos) protos /* full-blown ANSI C */
#define __CONCAT1(x,y) x ## y
#define __CONCAT(x,y) __CONCAT1(x,y)
#define __STRING(x) #x /* stringify without expanding x */
#define __XSTRING(x) __STRING(x) /* expand x, then stringify */
#define __const const /* define reserved names to standard */
#define __signed signed
#define __volatile volatile
#if defined(__cplusplus)
#define __inline inline /* convert to C++ keyword */
#else
#if !(defined(__CC_SUPPORTS___INLINE))
#define __inline /* delete GCC keyword */
#endif /* ! __CC_SUPPORTS___INLINE */
#endif /* !__cplusplus */
#else /* !(__STDC__ || __cplusplus) */
#define __P(protos) () /* traditional C preprocessor */
#define __CONCAT(x,y) x/**/y
#define __STRING(x) "x"
#if !defined(__CC_SUPPORTS___INLINE)
#define __const /* delete pseudo-ANSI C keywords */
#define __inline
#define __signed
#define __volatile
/*
* In non-ANSI C environments, new programs will want ANSI-only C keywords
* deleted from the program and old programs will want them left alone.
* When using a compiler other than gcc, programs using the ANSI C keywords
* const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
* When using "gcc -traditional", we assume that this is the intent; if
* __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
*/
#ifndef NO_ANSI_KEYWORDS
#define const /* delete ANSI C keywords */
#define inline
#define signed
#define volatile
#endif /* !NO_ANSI_KEYWORDS */
#endif /* !__CC_SUPPORTS___INLINE */
#endif /* !(__STDC__ || __cplusplus) */
/*
* Compiler-dependent macros to help declare dead (non-returning) and
* pure (no side effects) functions, and unused variables. They are
* null except for versions of gcc that are known to support the features
* properly (old versions of gcc-2 supported the dead and pure features
* in a different (wrong) way). If we do not provide an implementation
* for a given compiler, let the compile fail if it is told to use
* a feature that we cannot live without.
*/
#ifdef lint
#define __dead2
#define __pure2
#define __unused
#define __packed
#define __aligned(x)
#define __section(x)
#else
#if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
#define __dead2
#define __pure2
#define __unused
#endif
#if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
#define __dead2 __attribute__((__noreturn__))
#define __pure2 __attribute__((__const__))
#define __unused
/* XXX Find out what to do for __packed, __aligned and __section */
#endif
#if __GNUC_PREREQ__(2, 7)
#define __dead2 __attribute__((__noreturn__))
#define __pure2 __attribute__((__const__))
#define __unused __attribute__((__unused__))
#define __used __attribute__((__used__))
#define __packed __attribute__((__packed__))
#define __aligned(x) __attribute__((__aligned__(x)))
#define __section(x) __attribute__((__section__(x)))
#endif
#if defined(__INTEL_COMPILER)
#define __dead2 __attribute__((__noreturn__))
#define __pure2 __attribute__((__const__))
#define __unused __attribute__((__unused__))
#define __used __attribute__((__used__))
#define __packed __attribute__((__packed__))
#define __aligned(x) __attribute__((__aligned__(x)))
#define __section(x) __attribute__((__section__(x)))
#endif
#endif
#if __GNUC_PREREQ__(2, 96)
#define __pure __attribute__((__pure__))
#else
#define __pure
#endif
#if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
#define __always_inline __attribute__((__always_inline__))
#else
#define __always_inline
#endif
#if __GNUC_PREREQ__(3, 3)
#define __nonnull(x) __attribute__((__nonnull__(x)))
#else
#define __nonnull(x)
#endif
/* XXX: should use `#if __STDC_VERSION__ < 199901'. */
#if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
#define __func__ NULL
#endif
#if (defined(__INTEL_COMPILER) || (defined(__GNUC__) && __GNUC__ >= 2)) && !defined(__STRICT_ANSI__) || __STDC_VERSION__ >= 199901
#define __LONG_LONG_SUPPORTED
#endif
/*
* GCC 2.95 provides `__restrict' as an extension to C90 to support the
* C99-specific `restrict' type qualifier. We happen to use `__restrict' as
* a way to define the `restrict' type qualifier without disturbing older
* software that is unaware of C99 keywords.
*/
#if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901
#define __restrict
#else
#define __restrict restrict
#endif
#endif
/*
* GNU C version 2.96 adds explicit branch prediction so that
* the CPU back-end can hint the processor and also so that
* code blocks can be reordered such that the predicted path
* sees a more linear flow, thus improving cache behavior, etc.
*
* The following two macros provide us with a way to utilize this
* compiler feature. Use __predict_true() if you expect the expression
* to evaluate to true, and __predict_false() if you expect the
* expression to evaluate to false.
*
* A few notes about usage:
*
* * Generally, __predict_false() error condition checks (unless
* you have some _strong_ reason to do otherwise, in which case
* document it), and/or __predict_true() `no-error' condition
* checks, assuming you want to optimize for the no-error case.
*
* * Other than that, if you don't know the likelihood of a test
* succeeding from empirical or other `hard' evidence, don't
* make predictions.
*
* * These are meant to be used in places that are run `a lot'.
* It is wasteful to make predictions in code that is run
* seldomly (e.g. at subsystem initialization time) as the
* basic block reordering that this affects can often generate
* larger code.
*/
#if __GNUC_PREREQ__(2, 96)
#define __predict_true(exp) __builtin_expect((exp), 1)
#define __predict_false(exp) __builtin_expect((exp), 0)
#else
#define __predict_true(exp) (exp)
#define __predict_false(exp) (exp)
#endif
/*
* We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
* require it.
*/
#if __GNUC_PREREQ__(4, 1)
#define __offsetof(type, field) __builtin_offsetof(type, field)
#else
#ifndef __cplusplus
#define __offsetof(type, field) ((size_t)(&((type *)0)->field))
#else
#define __offsetof(type, field) \
(__offsetof__ (reinterpret_cast <size_t> \
(&reinterpret_cast <const volatile char &> \
(static_cast<type *> (0)->field))))
#endif
#endif
#define __rangeof(type, start, end) \
(__offsetof(type, end) - __offsetof(type, start))
/*
* Compiler-dependent macros to declare that functions take printf-like
* or scanf-like arguments. They are null except for versions of gcc
* that are known to support the features properly (old versions of gcc-2
* didn't permit keeping the keywords out of the application namespace).
*/
#if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
#define __printflike(fmtarg, firstvararg)
#define __scanflike(fmtarg, firstvararg)
#define __format_arg(fmtarg)
#else
#define __printflike(fmtarg, firstvararg) \
__attribute__((__format__ (__printf__, fmtarg, firstvararg)))
#define __scanflike(fmtarg, firstvararg) \
__attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
#define __format_arg(fmtarg) __attribute__((__format_arg__ (fmtarg)))
#endif
/* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
#if __FreeBSD_cc_version >= 300001 && defined(__GNUC__) && !defined(__INTEL_COMPILER)
#define __printf0like(fmtarg, firstvararg) \
__attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
#else
#define __printf0like(fmtarg, firstvararg)
#endif
#if defined(__GNUC__) || defined(__INTEL_COMPILER)
#ifndef __INTEL_COMPILER
#define __strong_reference(sym,aliassym) \
extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
#endif
#ifdef __STDC__
#define __weak_reference(sym,alias) \
__asm__(".weak " #alias); \
__asm__(".equ " #alias ", " #sym)
#define __warn_references(sym,msg) \
__asm__(".section .gnu.warning." #sym); \
__asm__(".asciz \"" msg "\""); \
__asm__(".previous")
#define __sym_compat(sym,impl,verid) \
__asm__(".symver " #impl ", " #sym "@" #verid)
#define __sym_default(sym,impl,verid) \
__asm__(".symver " #impl ", " #sym "@@" #verid)
#else
#define __weak_reference(sym,alias) \
__asm__(".weak alias"); \
__asm__(".equ alias, sym")
#define __warn_references(sym,msg) \
__asm__(".section .gnu.warning.sym"); \
__asm__(".asciz \"msg\""); \
__asm__(".previous")
#define __sym_compat(sym,impl,verid) \
__asm__(".symver impl, sym@verid")
#define __sym_default(impl,sym,verid) \
__asm__(".symver impl, sym@@verid")
#endif /* __STDC__ */
#endif /* __GNUC__ || __INTEL_COMPILER */
#if defined(__GNUC__) || defined(__INTEL_COMPILER)
#define __IDSTRING(name,string) __asm__(".ident\t\"" string "\"")
#else
/*
* The following definition might not work well if used in header files,
* but it should be better than nothing. If you want a "do nothing"
* version, then it should generate some harmless declaration, such as:
* #define __IDSTRING(name,string) struct __hack
*/
#define __IDSTRING(name,string) static const char name[] __unused = string
#endif
/*
* Embed the rcs id of a source file in the resulting library. Note that in
* more recent ELF binutils, we use .ident allowing the ID to be stripped.
* Usage:
* __FBSDID("$FreeBSD$");
*/
#ifndef __FBSDID
#if !defined(lint) && !defined(STRIP_FBSDID)
#define __FBSDID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
#else
#define __FBSDID(s) struct __hack
#endif
#endif
#ifndef __RCSID
#ifndef NO__RCSID
#define __RCSID(s) __IDSTRING(__CONCAT(__rcsid_,__LINE__),s)
#else
#define __RCSID(s) struct __hack
#endif
#endif
#ifndef __RCSID_SOURCE
#ifndef NO__RCSID_SOURCE
#define __RCSID_SOURCE(s) __IDSTRING(__CONCAT(__rcsid_source_,__LINE__),s)
#else
#define __RCSID_SOURCE(s) struct __hack
#endif
#endif
#ifndef __SCCSID
#ifndef NO__SCCSID
#define __SCCSID(s) __IDSTRING(__CONCAT(__sccsid_,__LINE__),s)
#else
#define __SCCSID(s) struct __hack
#endif
#endif
#ifndef __COPYRIGHT
#ifndef NO__COPYRIGHT
#define __COPYRIGHT(s) __IDSTRING(__CONCAT(__copyright_,__LINE__),s)
#else
#define __COPYRIGHT(s) struct __hack
#endif
#endif
#ifndef __DECONST
#define __DECONST(type, var) ((type)(uintptr_t)(const void *)(var))
#endif
#ifndef __DEVOLATILE
#define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var))
#endif
#ifndef __DEQUALIFY
#define __DEQUALIFY(type, var) ((type)(uintptr_t)(const volatile void *)(var))
#endif
/*-
* The following definitions are an extension of the behavior originally
* implemented in <sys/_posix.h>, but with a different level of granularity.
* POSIX.1 requires that the macros we test be defined before any standard
* header file is included.
*
* Here's a quick run-down of the versions:
* defined(_POSIX_SOURCE) 1003.1-1988
* _POSIX_C_SOURCE == 1 1003.1-1990
* _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option
* _POSIX_C_SOURCE == 199309 1003.1b-1993
* _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995,
* and the omnibus ISO/IEC 9945-1: 1996
* _POSIX_C_SOURCE == 200112 1003.1-2001
*
* In addition, the X/Open Portability Guide, which is now the Single UNIX
* Specification, defines a feature-test macro which indicates the version of
* that specification, and which subsumes _POSIX_C_SOURCE.
*
* Our macros begin with two underscores to avoid namespace screwage.
*/
/* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
#undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
#define _POSIX_C_SOURCE 199009
#endif
/* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
#undef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 199209
#endif
/* Deal with various X/Open Portability Guides and Single UNIX Spec. */
#ifdef _XOPEN_SOURCE
#if _XOPEN_SOURCE - 0 >= 600
#define __XSI_VISIBLE 600
#undef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 200112
#elif _XOPEN_SOURCE - 0 >= 500
#define __XSI_VISIBLE 500
#undef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 199506
#endif
#endif
/*
* Deal with all versions of POSIX. The ordering relative to the tests above is
* important.
*/
#if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
#define _POSIX_C_SOURCE 198808
#endif
#ifdef _POSIX_C_SOURCE
#if _POSIX_C_SOURCE >= 200112
#define __POSIX_VISIBLE 200112
#define __ISO_C_VISIBLE 1999
#elif _POSIX_C_SOURCE >= 199506
#define __POSIX_VISIBLE 199506
#define __ISO_C_VISIBLE 1990
#elif _POSIX_C_SOURCE >= 199309
#define __POSIX_VISIBLE 199309
#define __ISO_C_VISIBLE 1990
#elif _POSIX_C_SOURCE >= 199209
#define __POSIX_VISIBLE 199209
#define __ISO_C_VISIBLE 1990
#elif _POSIX_C_SOURCE >= 199009
#define __POSIX_VISIBLE 199009
#define __ISO_C_VISIBLE 1990
#else
#define __POSIX_VISIBLE 198808
#define __ISO_C_VISIBLE 0
#endif /* _POSIX_C_SOURCE */
#else
/*-
* Deal with _ANSI_SOURCE:
* If it is defined, and no other compilation environment is explicitly
* requested, then define our internal feature-test macros to zero. This
* makes no difference to the preprocessor (undefined symbols in preprocessing
* expressions are defined to have value zero), but makes it more convenient for
* a test program to print out the values.
*
* If a program mistakenly defines _ANSI_SOURCE and some other macro such as
* _POSIX_C_SOURCE, we will assume that it wants the broader compilation
* environment (and in fact we will never get here).
*/
#if defined(_ANSI_SOURCE) /* Hide almost everything. */
#define __POSIX_VISIBLE 0
#define __XSI_VISIBLE 0
#define __BSD_VISIBLE 0
#define __ISO_C_VISIBLE 1990
#elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
#define __POSIX_VISIBLE 0
#define __XSI_VISIBLE 0
#define __BSD_VISIBLE 0
#define __ISO_C_VISIBLE 1999
#else /* Default environment: show everything. */
#define __POSIX_VISIBLE 200112
#define __XSI_VISIBLE 600
#define __BSD_VISIBLE 1
#define __ISO_C_VISIBLE 1999
#endif
#endif
#endif /* !_SYS_CDEFS_H_ */
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