469 lines
15 KiB
C
469 lines
15 KiB
C
/* $NetBSD: cdefs.h,v 1.78 2009/10/02 21:05:28 christos Exp $ */
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/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Berkeley Software Design, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)cdefs.h 8.8 (Berkeley) 1/9/95
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*/
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#ifndef _SYS_CDEFS_H_
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#define _SYS_CDEFS_H_
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/*
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* Macro to test if we're using a GNU C compiler of a specific vintage
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* or later, for e.g. features that appeared in a particular version
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* of GNU C. Usage:
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*
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* #if __GNUC_PREREQ__(major, minor)
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* ...cool feature...
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* #else
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* ...delete feature...
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* #endif
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*/
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#ifdef __GNUC__
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#define __GNUC_PREREQ__(x, y) \
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((__GNUC__ == (x) && __GNUC_MINOR__ >= (y)) || \
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(__GNUC__ > (x)))
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#else
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#define __GNUC_PREREQ__(x, y) 0
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#endif
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#if 0
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#include <machine/cdefs.h>
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#ifdef __ELF__
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#include <sys/cdefs_elf.h>
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#else
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#include <sys/cdefs_aout.h>
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#endif
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#endif
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#if defined(__cplusplus)
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#define __BEGIN_DECLS extern "C" {
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#define __END_DECLS }
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#define __static_cast(x,y) static_cast<x>(y)
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#else
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#define __BEGIN_DECLS
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#define __END_DECLS
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#define __static_cast(x,y) (x)y
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#endif
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/*
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* The __CONCAT macro is used to concatenate parts of symbol names, e.g.
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* with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
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* The __CONCAT macro is a bit tricky -- make sure you don't put spaces
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* in between its arguments. __CONCAT can also concatenate double-quoted
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* strings produced by the __STRING macro, but this only works with ANSI C.
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*/
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#define ___STRING(x) __STRING(x)
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#define ___CONCAT(x,y) __CONCAT(x,y)
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#if __STDC__ || defined(__cplusplus)
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#define __P(protos) protos /* full-blown ANSI C */
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#define __CONCAT(x,y) x ## y
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#define __STRING(x) #x
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#define __const const /* define reserved names to standard */
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#define __signed signed
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#define __volatile volatile
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#if defined(__cplusplus) || defined(__PCC__)
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#define __inline inline /* convert to C++/C99 keyword */
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#else
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#if !defined(__GNUC__) && !defined(__lint__)
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#define __inline /* delete GCC keyword */
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#endif /* !__GNUC__ && !__lint__ */
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#endif /* !__cplusplus */
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#else /* !(__STDC__ || __cplusplus) */
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#define __P(protos) () /* traditional C preprocessor */
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#define __CONCAT(x,y) x/**/y
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#define __STRING(x) "x"
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#ifndef __GNUC__
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#define __const /* delete pseudo-ANSI C keywords */
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#define __inline
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#define __signed
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#define __volatile
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#endif /* !__GNUC__ */
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/*
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* In non-ANSI C environments, new programs will want ANSI-only C keywords
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* deleted from the program and old programs will want them left alone.
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* Programs using the ANSI C keywords const, inline etc. as normal
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* identifiers should define -DNO_ANSI_KEYWORDS.
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*/
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#ifndef NO_ANSI_KEYWORDS
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#define const __const /* convert ANSI C keywords */
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#define inline __inline
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#define signed __signed
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#define volatile __volatile
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#endif /* !NO_ANSI_KEYWORDS */
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#endif /* !(__STDC__ || __cplusplus) */
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/*
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* Used for internal auditing of the NetBSD source tree.
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*/
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#ifdef __AUDIT__
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#define __aconst __const
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#else
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#define __aconst
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#endif
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/*
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* The following macro is used to remove const cast-away warnings
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* from gcc -Wcast-qual; it should be used with caution because it
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* can hide valid errors; in particular most valid uses are in
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* situations where the API requires it, not to cast away string
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* constants. We don't use *intptr_t on purpose here and we are
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* explicit about unsigned long so that we don't have additional
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* dependencies.
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*/
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#define __UNCONST(a) ((void *)(unsigned long)(const void *)(a))
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/*
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* The following macro is used to remove the volatile cast-away warnings
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* from gcc -Wcast-qual; as above it should be used with caution
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* because it can hide valid errors or warnings. Valid uses include
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* making it possible to pass a volatile pointer to memset().
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* For the same reasons as above, we use unsigned long and not intptr_t.
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*/
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#define __UNVOLATILE(a) ((void *)(unsigned long)(volatile void *)(a))
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/*
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* GCC2 provides __extension__ to suppress warnings for various GNU C
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* language extensions under "-ansi -pedantic".
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*/
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#if !__GNUC_PREREQ__(2, 0)
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#define __extension__ /* delete __extension__ if non-gcc or gcc1 */
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#endif
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/*
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* GCC1 and some versions of GCC2 declare dead (non-returning) and
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* pure (no side effects) functions using "volatile" and "const";
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* unfortunately, these then cause warnings under "-ansi -pedantic".
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* GCC2 uses a new, peculiar __attribute__((attrs)) style. All of
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* these work for GNU C++ (modulo a slight glitch in the C++ grammar
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* in the distribution version of 2.5.5).
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*
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* GCC defines a pure function as depending only on its arguments and
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* global variables. Typical examples are strlen and sqrt.
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*
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* GCC defines a const function as depending only on its arguments.
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* Therefore calling a const function again with identical arguments
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* will always produce the same result.
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*
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* Rounding modes for floating point operations are considered global
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* variables and prevent sqrt from being a const function.
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*
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* Calls to const functions can be optimised away and moved around
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* without limitations.
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*/
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#if !__GNUC_PREREQ__(2, 0)
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#define __attribute__(x)
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#endif
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#if __GNUC_PREREQ__(2, 5)
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#define __dead __attribute__((__noreturn__))
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#elif defined(__GNUC__)
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#define __dead __volatile
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#else
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#define __dead
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#endif
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#if __GNUC_PREREQ__(2, 96)
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#define __pure __attribute__((__pure__))
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#elif defined(__GNUC__)
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#define __pure __const
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#else
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#define __pure
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#endif
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#if __GNUC_PREREQ__(2, 5)
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#define __constfunc __attribute__((__const__))
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#else
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#define __constfunc
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#endif
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#if __GNUC_PREREQ__(3, 0)
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#define __noinline __attribute__((__noinline__))
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#else
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#define __noinline /* nothing */
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#endif
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#if __GNUC_PREREQ__(2, 7)
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#define __unused __attribute__((__unused__))
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#else
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#define __unused /* delete */
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#endif
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#if __GNUC_PREREQ__(3, 1)
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#define __used __attribute__((__used__))
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#else
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#define __used __unused
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#endif
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#if defined(__lint__)
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#define __packed __packed
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#define __aligned(x) /* delete */
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#define __section(x) /* delete */
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#elif __GNUC_PREREQ__(2, 7)
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#define __packed __attribute__((__packed__))
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#define __aligned(x) __attribute__((__aligned__(x)))
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#define __section(x) __attribute__((__section__(x)))
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#elif defined(__PCC__)
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#define __packed _Pragma("packed 1")
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#define __aligned(x) _Pragma("aligned " __STRING(x))
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#define __section(x) _Pragma("section " ## x)
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#else
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#define __packed error: no __packed for this compiler
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#define __aligned(x) error: no __aligned for this compiler
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#define __section(x) error: no __section for this compiler
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#endif
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/*
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* C99 defines the restrict type qualifier keyword, which was made available
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* in GCC 2.92.
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*/
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#if defined(__lint__)
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#define __restrict /* delete __restrict when not supported */
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#elif __STDC_VERSION__ >= 199901L
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#define __restrict restrict
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#elif !__GNUC_PREREQ__(2, 92)
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#define __restrict /* delete __restrict when not supported */
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#endif
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/*
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* C99 defines __func__ predefined identifier, which was made available
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* in GCC 2.95.
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*/
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#if !(__STDC_VERSION__ >= 199901L)
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#if __GNUC_PREREQ__(2, 6)
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#define __func__ __PRETTY_FUNCTION__
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#elif __GNUC_PREREQ__(2, 4)
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#define __func__ __FUNCTION__
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#else
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#define __func__ ""
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#endif
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#endif /* !(__STDC_VERSION__ >= 199901L) */
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#if defined(_KERNEL)
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#if defined(NO_KERNEL_RCSIDS)
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#undef __KERNEL_RCSID
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#define __KERNEL_RCSID(_n, _s) /* nothing */
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#endif /* NO_KERNEL_RCSIDS */
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#endif /* _KERNEL */
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#if 0
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#if !defined(_STANDALONE) && !defined(_KERNEL)
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#if defined(__GNUC__) || defined(__PCC__)
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#define __RENAME(x) ___RENAME(x)
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#else
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#ifdef __lint__
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#define __RENAME(x) __symbolrename(x)
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#else
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#error "No function renaming possible"
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#endif /* __lint__ */
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#endif /* __GNUC__ */
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#else /* _STANDALONE || _KERNEL */
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#define __RENAME(x) no renaming in kernel or standalone environment
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#endif
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#endif
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/*
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* A barrier to stop the optimizer from moving code or assume live
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* register values. This is gcc specific, the version is more or less
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* arbitrary, might work with older compilers.
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*/
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#if __GNUC_PREREQ__(2, 95)
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#define __insn_barrier() __asm __volatile("":::"memory")
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#else
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#define __insn_barrier() /* */
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#endif
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/*
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* GNU C version 2.96 adds explicit branch prediction so that
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* the CPU back-end can hint the processor and also so that
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* code blocks can be reordered such that the predicted path
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* sees a more linear flow, thus improving cache behavior, etc.
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*
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* The following two macros provide us with a way to use this
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* compiler feature. Use __predict_true() if you expect the expression
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* to evaluate to true, and __predict_false() if you expect the
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* expression to evaluate to false.
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*
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* A few notes about usage:
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*
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* * Generally, __predict_false() error condition checks (unless
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* you have some _strong_ reason to do otherwise, in which case
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* document it), and/or __predict_true() `no-error' condition
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* checks, assuming you want to optimize for the no-error case.
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*
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* * Other than that, if you don't know the likelihood of a test
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* succeeding from empirical or other `hard' evidence, don't
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* make predictions.
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*
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* * These are meant to be used in places that are run `a lot'.
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* It is wasteful to make predictions in code that is run
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* seldomly (e.g. at subsystem initialization time) as the
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* basic block reordering that this affects can often generate
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* larger code.
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*/
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#if __GNUC_PREREQ__(2, 96)
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#define __predict_true(exp) __builtin_expect((exp) != 0, 1)
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#define __predict_false(exp) __builtin_expect((exp) != 0, 0)
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#else
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#define __predict_true(exp) (exp)
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#define __predict_false(exp) (exp)
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#endif
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/*
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* We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
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* require it.
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*/
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#if __GNUC_PREREQ__(4, 1)
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#define __offsetof(type, field) __builtin_offsetof(type, field)
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#else
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#ifndef __cplusplus
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#define __offsetof(type, field) ((size_t)(&((type *)0)->field))
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#else
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#define __offsetof(type, field) \
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(__offsetof__ (reinterpret_cast <size_t> \
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(&reinterpret_cast <const volatile char &> \
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(static_cast<type *> (0)->field))))
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#endif
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#endif
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#define __rangeof(type, start, end) \
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(__offsetof(type, end) - __offsetof(type, start))
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/*
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* Compiler-dependent macros to declare that functions take printf-like
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* or scanf-like arguments. They are null except for versions of gcc
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* that are known to support the features properly (old versions of gcc-2
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* didn't permit keeping the keywords out of the application namespace).
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*/
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#if __GNUC_PREREQ__(2, 7)
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#define __printflike(fmtarg, firstvararg) \
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__attribute__((__format__ (__printf__, fmtarg, firstvararg)))
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#define __scanflike(fmtarg, firstvararg) \
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__attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
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#define __format_arg(fmtarg) __attribute__((__format_arg__ (fmtarg)))
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#else
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#define __printflike(fmtarg, firstvararg) /* nothing */
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#define __scanflike(fmtarg, firstvararg) /* nothing */
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#define __format_arg(fmtarg) /* nothing */
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#endif
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/*
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* Macros for manipulating "link sets". Link sets are arrays of pointers
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* to objects, which are gathered up by the linker.
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*
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* Object format-specific code has provided us with the following macros:
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*
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* __link_set_add_text(set, sym)
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* Add a reference to the .text symbol `sym' to `set'.
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*
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* __link_set_add_rodata(set, sym)
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* Add a reference to the .rodata symbol `sym' to `set'.
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*
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* __link_set_add_data(set, sym)
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* Add a reference to the .data symbol `sym' to `set'.
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*
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* __link_set_add_bss(set, sym)
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* Add a reference to the .bss symbol `sym' to `set'.
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*
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* __link_set_decl(set, ptype)
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* Provide an extern declaration of the set `set', which
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* contains an array of the pointer type `ptype'. This
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* macro must be used by any code which wishes to reference
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* the elements of a link set.
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*
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* __link_set_start(set)
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* This points to the first slot in the link set.
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*
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* __link_set_end(set)
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* This points to the (non-existent) slot after the last
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* entry in the link set.
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*
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* __link_set_count(set)
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* Count the number of entries in link set `set'.
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*
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* In addition, we provide the following macros for accessing link sets:
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*
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* __link_set_foreach(pvar, set)
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* Iterate over the link set `set'. Because a link set is
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* an array of pointers, pvar must be declared as "type **pvar",
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* and the actual entry accessed as "*pvar".
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*
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* __link_set_entry(set, idx)
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* Access the link set entry at index `idx' from set `set'.
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*/
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#define __link_set_foreach(pvar, set) \
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for (pvar = __link_set_start(set); pvar < __link_set_end(set); pvar++)
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#define __link_set_entry(set, idx) (__link_set_begin(set)[idx])
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/*
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* Return the number of elements in a statically-allocated array,
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* __x.
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*/
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#define __arraycount(__x) (sizeof(__x) / sizeof(__x[0]))
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/* __BIT(n): nth bit, where __BIT(0) == 0x1. */
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#define __BIT(__n) \
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(((uintmax_t)(__n) >= NBBY * sizeof(uintmax_t)) ? 0 : ((uintmax_t)1 << (uintmax_t)(__n)))
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/* __BITS(m, n): bits m through n, m < n. */
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#define __BITS(__m, __n) \
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((__BIT(MAX((__m), (__n)) + 1) - 1) ^ (__BIT(MIN((__m), (__n))) - 1))
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/* find least significant bit that is set */
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#define __LOWEST_SET_BIT(__mask) ((((__mask) - 1) & (__mask)) ^ (__mask))
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#define __PRIuBIT PRIuMAX
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#define __PRIuBITS __PRIuBIT
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#define __PRIxBIT PRIxMAX
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#define __PRIxBITS __PRIxBIT
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#define __SHIFTOUT(__x, __mask) (((__x) & (__mask)) / __LOWEST_SET_BIT(__mask))
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#define __SHIFTIN(__x, __mask) ((__x) * __LOWEST_SET_BIT(__mask))
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#define __SHIFTOUT_MASK(__mask) __SHIFTOUT((__mask), (__mask))
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/*
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* Only to be used in other headers that are included from both c or c++
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* NOT to be used in code.
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*/
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#ifdef __cplusplus
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#define __CAST(__dt, __st) static_cast<__dt>(__st)
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#else
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#define __CAST(__dt, __st) ((__dt)(__st))
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#endif
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#endif /* !_SYS_CDEFS_H_ */
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