/* $NetBSD: cdefs.h,v 1.42 2001/11/23 10:19:47 enami Exp $ */ /* * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 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 */ #ifndef _SYS_CDEFS_H_ #define _SYS_CDEFS_H_ /* * Macro to test if we're using a GNU C compiler of a specific vintage * or later, for e.g. features that appeared in a particular version * of GNU C. Usage: * * #if __GNUC_PREREQ__(major, minor) * ...cool feature... * #else * ...delete feature... * #endif */ #ifdef __GNUC__ #define __GNUC_PREREQ__(x, y) \ ((__GNUC__ == (x) && __GNUC_MINOR__ >= (y)) || \ (__GNUC__ > (x))) #else #define __GNUC_PREREQ__(x, y) 0 #endif #include #ifdef __ELF__ #include #else #include #endif #if defined(__cplusplus) #define __BEGIN_DECLS extern "C" { #define __END_DECLS }; #define __static_cast(x,y) static_cast(y) #else #define __BEGIN_DECLS #define __END_DECLS #define __static_cast(x,y) (x)y #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 -- make sure you don't put spaces * in between its arguments. __CONCAT can also concatenate double-quoted * strings produced by the __STRING macro, but this only works with ANSI C. */ #define ___STRING(x) __STRING(x) #define ___CONCAT(x,y) __CONCAT(x,y) #if __STDC__ || defined(__cplusplus) #define __P(protos) protos /* full-blown ANSI C */ #define __CONCAT(x,y) x ## y #define __STRING(x) #x #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(__GNUC__) && !defined(__lint__) #define __inline /* delete GCC keyword */ #endif /* !__GNUC__ && !__lint__ */ #endif /* !__cplusplus */ #else /* !(__STDC__ || __cplusplus) */ #define __P(protos) () /* traditional C preprocessor */ #define __CONCAT(x,y) x/**/y #define __STRING(x) "x" #ifndef __GNUC__ #define __const /* delete pseudo-ANSI C keywords */ #define __inline #define __signed #define __volatile #endif /* !__GNUC__ */ /* * 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. * Programs using the ANSI C keywords const, inline etc. as normal * identifiers should define -DNO_ANSI_KEYWORDS. */ #ifndef NO_ANSI_KEYWORDS #define const __const /* convert ANSI C keywords */ #define inline __inline #define signed __signed #define volatile __volatile #endif /* !NO_ANSI_KEYWORDS */ #endif /* !(__STDC__ || __cplusplus) */ /* * Used for internal auditing of the NetBSD source tree. */ #ifdef __AUDIT__ #define __aconst __const #else #define __aconst #endif /* * GCC2 provides __extension__ to suppress warnings for various GNU C * language extensions under "-ansi -pedantic". */ #if !__GNUC_PREREQ__(2, 0) #define __extension__ /* delete __extension__ if non-gcc or gcc1 */ #endif /* * GCC1 and some versions of GCC2 declare dead (non-returning) and * pure (no side effects) functions using "volatile" and "const"; * unfortunately, these then cause warnings under "-ansi -pedantic". * GCC2 uses a new, peculiar __attribute__((attrs)) style. All of * these work for GNU C++ (modulo a slight glitch in the C++ grammar * in the distribution version of 2.5.5). */ #if !__GNUC_PREREQ__(2, 5) #define __attribute__(x) /* delete __attribute__ if non-gcc or gcc1 */ #if defined(__GNUC__) && !defined(__STRICT_ANSI__) #define __dead __volatile #define __pure __const #endif #endif /* Delete pseudo-keywords wherever they are not available or needed. */ #ifndef __dead #define __dead #define __pure #endif /* * C99 defines the restrict type qualifier keyword, which was made available * in GCC 2.92. */ #if __STDC_VERSION__ >= 199901L #define __restrict restrict #else #if !__GNUC_PREREQ__(2, 92) #define __restrict /* delete __restrict when not supported */ #endif #endif /* * C99 defines __func__ predefined identifier, which was made available * in GCC 2.95. */ #if !(__STDC_VERSION__ >= 199901L) #if __GNUC_PREREQ__(2, 6) #define __func__ __PRETTY_FUNCTION__ #elif __GNUC_PREREQ__(2, 4) #define __func__ __FUNCTION__ #else #define __func__ "" #endif #endif /* !(__STDC_VERSION__ >= 199901L) */ #if defined(_KERNEL) #if defined(NO_KERNEL_RCSIDS) #undef __KERNEL_RCSID #define __KERNEL_RCSID(_n, _s) /* nothing */ #endif /* NO_KERNEL_RCSIDS */ #endif /* _KERNEL */ #if !defined(_STANDALONE) && !defined(_KERNEL) #ifdef __GNUC__ #define __RENAME(x) ___RENAME(x) #else #ifdef __lint__ #define __RENAME(x) __symbolrename(x) #else #error "No function renaming possible" #endif /* __lint__ */ #endif /* __GNUC__ */ #else /* _STANDALONE || _KERNEL */ #define __RENAME(x) no renaming in kernel or standalone environment #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) != 0), 1) #define __predict_false(exp) __builtin_expect(((exp) != 0), 0) #else #define __predict_true(exp) ((exp) != 0) #define __predict_false(exp) ((exp) != 0) #endif #endif /* !_SYS_CDEFS_H_ */