473 lines
15 KiB
C
473 lines
15 KiB
C
/* $NetBSD: cdefs.h,v 1.58 2004/12/11 05:59:00 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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* Testing against Clang-specific extensions.
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*/
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#ifndef __has_extension
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#define __has_extension __has_feature
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#endif
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#ifndef __has_feature
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#define __has_feature(x) 0
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#endif
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#ifndef __has_include
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#define __has_include(x) 0
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#endif
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#ifndef __has_builtin
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#define __has_builtin(x) 0
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#endif
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#ifndef __has_attribute
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#define __has_attribute(x) 0
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#endif
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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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#define __strong_alias(alias, sym) \
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__asm__(".global " #alias "\n" \
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#alias " = " #sym);
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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 defined(__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)
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#define __inline inline /* convert to C++ 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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#endif /* !(__STDC__ || __cplusplus) */
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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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#define __dead __attribute__((__noreturn__))
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#define __pure __attribute__((__const__))
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#define __pure2 __attribute__((__const__)) /* Android-added: used by FreeBSD libm */
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#define __unused __attribute__((__unused__))
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#define __used __attribute__((__used__))
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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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#define __statement(x) __extension__(x)
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#define __nonnull(args) __attribute__((__nonnull__ args))
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#define __printflike(x, y) __attribute__((__format__(printf, x, y))) __nonnull((x))
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#define __scanflike(x, y) __attribute__((__format__(scanf, x, y))) __nonnull((x))
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/*
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* C99 defines the restrict type qualifier keyword.
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*/
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#if defined(__STDC__VERSION__) && __STDC_VERSION__ >= 199901L
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#define __restrict restrict
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#endif
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/*
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* C99 defines __func__ predefined identifier.
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*/
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#if !defined(__STDC_VERSION__) || !(__STDC_VERSION__ >= 199901L)
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#define __func__ __PRETTY_FUNCTION__
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#endif /* !(__STDC_VERSION__ >= 199901L) */
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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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#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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#define __noreturn __attribute__((__noreturn__))
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#define __mallocfunc __attribute__((malloc))
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#define __purefunc __attribute__((pure))
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#define __always_inline __attribute__((__always_inline__))
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#define __wur __attribute__((__warn_unused_result__))
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#define __errorattr(msg) __attribute__((__error__(msg)))
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#define __warnattr(msg) __attribute__((__warning__(msg)))
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#define __errordecl(name, msg) extern void name(void) __errorattr(msg)
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/*
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* Some BSD source needs these macros.
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* Originally they embedded the rcs versions of each source file
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* in the generated binary. We strip strings during build anyway,.
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*/
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#define __IDSTRING(_prefix,_s) /* nothing */
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#define __COPYRIGHT(_s) /* nothing */
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#define __FBSDID(_s) /* nothing */
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#define __RCSID(_s) /* nothing */
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#define __SCCSID(_s) /* nothing */
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/*
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* _BSD_SOURCE and _GNU_SOURCE are expected to be defined by callers before
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* any standard header file is included. In those header files we test
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* against __USE_BSD and __USE_GNU. glibc does this in <features.h> but we
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* do it in <sys/cdefs.h> instead because that's where our existing
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* _POSIX_C_SOURCE tests were, and we're already confident that <sys/cdefs.h>
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* is included everywhere it should be.
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*
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* The _GNU_SOURCE test needs to come before any _BSD_SOURCE or _POSIX* tests
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* because _GNU_SOURCE implies everything else.
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*/
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#if defined(_GNU_SOURCE)
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# define __USE_GNU 1
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# undef _POSIX_SOURCE
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# define _POSIX_SOURCE 1
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# undef _POSIX_C_SOURCE
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# define _POSIX_C_SOURCE 200809L
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# undef _BSD_SOURCE
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# define _BSD_SOURCE 1
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#endif
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#if defined(_BSD_SOURCE)
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# define __USE_BSD 1
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#endif
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/*
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* _FILE_OFFSET_BITS 64 support.
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*/
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#if !defined(__LP64__) && defined(_FILE_OFFSET_BITS)
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#if _FILE_OFFSET_BITS == 64
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#define __USE_FILE_OFFSET64 1
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#endif
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#endif
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/*-
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* POSIX.1 requires that the macros we test be defined before any standard
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* header file is included.
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*
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* Here's a quick run-down of the versions:
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* defined(_POSIX_SOURCE) 1003.1-1988
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* _POSIX_C_SOURCE == 1 1003.1-1990
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* _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option
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* _POSIX_C_SOURCE == 199309 1003.1b-1993
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* _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995,
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* and the omnibus ISO/IEC 9945-1: 1996
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* _POSIX_C_SOURCE == 200112 1003.1-2001
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* _POSIX_C_SOURCE == 200809 1003.1-2008
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*
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* In addition, the X/Open Portability Guide, which is now the Single UNIX
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* Specification, defines a feature-test macro which indicates the version of
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* that specification, and which subsumes _POSIX_C_SOURCE.
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*
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* Our macros begin with two underscores to avoid namespace screwage.
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*/
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/* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
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#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
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#undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
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#define _POSIX_C_SOURCE 199009
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#endif
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/* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
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#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
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#undef _POSIX_C_SOURCE
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#define _POSIX_C_SOURCE 199209
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#endif
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/* Deal with various X/Open Portability Guides and Single UNIX Spec. */
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#ifdef _XOPEN_SOURCE
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#if _XOPEN_SOURCE - 0 >= 700
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#define __XSI_VISIBLE 700
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#undef _POSIX_C_SOURCE
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#define _POSIX_C_SOURCE 200809
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#elif _XOPEN_SOURCE - 0 >= 600
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#define __XSI_VISIBLE 600
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#undef _POSIX_C_SOURCE
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#define _POSIX_C_SOURCE 200112
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#elif _XOPEN_SOURCE - 0 >= 500
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#define __XSI_VISIBLE 500
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#undef _POSIX_C_SOURCE
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#define _POSIX_C_SOURCE 199506
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#endif
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#endif
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/*
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* Deal with all versions of POSIX. The ordering relative to the tests above is
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* important.
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*/
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#if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
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#define _POSIX_C_SOURCE 198808
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#endif
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#ifdef _POSIX_C_SOURCE
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#if _POSIX_C_SOURCE >= 200809
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#define __POSIX_VISIBLE 200809
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#define __ISO_C_VISIBLE 1999
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#elif _POSIX_C_SOURCE >= 200112
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#define __POSIX_VISIBLE 200112
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#define __ISO_C_VISIBLE 1999
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#elif _POSIX_C_SOURCE >= 199506
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#define __POSIX_VISIBLE 199506
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#define __ISO_C_VISIBLE 1990
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#elif _POSIX_C_SOURCE >= 199309
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#define __POSIX_VISIBLE 199309
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#define __ISO_C_VISIBLE 1990
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#elif _POSIX_C_SOURCE >= 199209
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#define __POSIX_VISIBLE 199209
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#define __ISO_C_VISIBLE 1990
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#elif _POSIX_C_SOURCE >= 199009
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#define __POSIX_VISIBLE 199009
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#define __ISO_C_VISIBLE 1990
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#else
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#define __POSIX_VISIBLE 198808
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#define __ISO_C_VISIBLE 0
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#endif /* _POSIX_C_SOURCE */
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#else
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/*-
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* Deal with _ANSI_SOURCE:
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* If it is defined, and no other compilation environment is explicitly
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* requested, then define our internal feature-test macros to zero. This
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* makes no difference to the preprocessor (undefined symbols in preprocessing
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* expressions are defined to have value zero), but makes it more convenient for
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* a test program to print out the values.
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*
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* If a program mistakenly defines _ANSI_SOURCE and some other macro such as
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* _POSIX_C_SOURCE, we will assume that it wants the broader compilation
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* environment (and in fact we will never get here).
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*/
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#if defined(_ANSI_SOURCE) /* Hide almost everything. */
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#define __POSIX_VISIBLE 0
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#define __XSI_VISIBLE 0
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#define __BSD_VISIBLE 0
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#define __ISO_C_VISIBLE 1990
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#elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
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#define __POSIX_VISIBLE 0
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#define __XSI_VISIBLE 0
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#define __BSD_VISIBLE 0
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#define __ISO_C_VISIBLE 1999
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#else /* Default environment: show everything. */
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#define __POSIX_VISIBLE 200809
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#define __XSI_VISIBLE 700
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#define __BSD_VISIBLE 1
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#define __ISO_C_VISIBLE 1999
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#endif
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#endif
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/*
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* Default values.
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*/
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#ifndef __XPG_VISIBLE
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# define __XPG_VISIBLE 700
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#endif
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#ifndef __POSIX_VISIBLE
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# define __POSIX_VISIBLE 200809
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#endif
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#ifndef __ISO_C_VISIBLE
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# define __ISO_C_VISIBLE 1999
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#endif
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#ifndef __BSD_VISIBLE
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# define __BSD_VISIBLE 1
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#endif
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#define __BIONIC__ 1
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#include <android/api-level.h>
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/* glibc compatibility. */
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#if __POSIX_VISIBLE >= 200809
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#define __USE_ISOC99 1
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#define __USE_XOPEN2K 1
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#define __USE_XOPEN2K8 1
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#endif
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#if __LP64__
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#define __WORDSIZE 64
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#else
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#define __WORDSIZE 32
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#endif
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/*
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* When _FORTIFY_SOURCE is defined, automatic bounds checking is
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* added to commonly used libc functions. If a buffer overrun is
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* detected, the program is safely aborted.
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*
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* See
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* http://gcc.gnu.org/onlinedocs/gcc/Object-Size-Checking.html for details.
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*/
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#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && defined(__OPTIMIZE__) && __OPTIMIZE__ > 0
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# define __BIONIC_FORTIFY 1
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# if _FORTIFY_SOURCE == 2
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# define __bos(s) __builtin_object_size((s), 1)
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# else
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# define __bos(s) __builtin_object_size((s), 0)
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# endif
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# define __bos0(s) __builtin_object_size((s), 0)
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# define __BIONIC_FORTIFY_INLINE extern __inline__ __always_inline __attribute__((gnu_inline)) __attribute__((__artificial__))
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#endif
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#define __BIONIC_FORTIFY_UNKNOWN_SIZE ((size_t) -1)
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/* Used to tag non-static symbols that are private and never exposed by the shared library. */
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#define __LIBC_HIDDEN__ __attribute__((visibility("hidden")))
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/* Like __LIBC_HIDDEN__, but preserves binary compatibility for LP32. */
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#ifdef __LP64__
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#define __LIBC32_LEGACY_PUBLIC__ __LIBC_HIDDEN__
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#else
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#define __LIBC32_LEGACY_PUBLIC__ __LIBC_ABI_PUBLIC__
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#endif
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/* Used to tag non-static symbols that are public and exposed by the shared library. */
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#define __LIBC_ABI_PUBLIC__ __attribute__((visibility ("default")))
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/* Used to rename functions so that the compiler emits a call to 'x' rather than the function this was applied to. */
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#define __RENAME(x) __asm__(#x)
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#ifdef __clang__
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#define __AVAILABILITY(...) __attribute__((availability(android,__VA_ARGS__)))
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#define __INTRODUCED_IN(api_level) __AVAILABILITY(introduced=api_level)
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#define __DEPRECATED_IN(api_level) __AVAILABILITY(deprecated=api_level)
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#define __REMOVED_IN(api_level) __AVAILABILITY(obsoleted=api_level)
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#else
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#define __AVAILABILITY(...)
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#define __INTRODUCED_IN(api_level)
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#define __DEPRECATED_IN(api_level)
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#define __REMOVED_IN(api_level)
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#endif // __clang__
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#if __has_builtin(__builtin_umul_overflow) || __GNUC__ >= 5
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#if __LP64__
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#define __size_mul_overflow(a, b, result) __builtin_umull_overflow(a, b, result)
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#else
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#define __size_mul_overflow(a, b, result) __builtin_umul_overflow(a, b, result)
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#endif
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#else
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static __inline__ __always_inline int __size_mul_overflow(__SIZE_TYPE__ a, __SIZE_TYPE__ b,
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__SIZE_TYPE__ *result) {
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*result = a * b;
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static const __SIZE_TYPE__ mul_no_overflow = 1UL << (sizeof(__SIZE_TYPE__) * 4);
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return (a >= mul_no_overflow || b >= mul_no_overflow) && a > 0 && (__SIZE_TYPE__)-1 / a < b;
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}
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#endif
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#endif /* !_SYS_CDEFS_H_ */
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