9eb3ae122f
It's a dangerous pain in the ass, and we're only using it in one place, and that's a mistake too. Change-Id: Ida1d1286aaa1343bdee95fa092fcb45ff3258f77
356 lines
12 KiB
C
356 lines
12 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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#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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#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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#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 __always_inline __attribute__((__always_inline__))
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#define __dead __attribute__((__noreturn__))
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#define __noreturn __attribute__((__noreturn__))
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#define __mallocfunc __attribute__((malloc))
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#define __packed __attribute__((__packed__))
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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 __purefunc __attribute__((pure))
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#define __unused __attribute__((__unused__))
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#define __used __attribute__((__used__))
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/*
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* _Nonnull is similar to the nonnull attribute in that it will instruct
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* compilers to warn the user if it can prove that a null argument is being
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* passed. Unlike the nonnull attribute, this annotation indicated that a value
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* *should not* be null, not that it *cannot* be null, or even that the behavior
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* is undefined. The important distinction is that the optimizer will perform
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* surprising optimizations like the following:
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*
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* void foo(void*) __attribute__(nonnull, 1);
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*
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* int bar(int* p) {
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* foo(p);
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*
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* // The following null check will be elided because nonnull attribute
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* // means that, since we call foo with p, p can be assumed to not be
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* // null. Thus this will crash if we are called with a null pointer.
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* if (p != NULL) {
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* return *p;
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* }
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* return 0;
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* }
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*
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* int main() {
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* return bar(NULL);
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* }
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*
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* http://clang.llvm.org/docs/AttributeReference.html#nonnull
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*/
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#if !(defined(__clang__) && __has_feature(nullability))
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#define _Nonnull
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#endif
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#define __printflike(x, y) __attribute__((__format__(printf, x, y)))
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#define __scanflike(x, y) __attribute__((__format__(scanf, x, y)))
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/*
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* GNU C version 2.96 added 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 __wur __attribute__((__warn_unused_result__))
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#ifdef __clang__
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#define __errorattr(msg) __attribute__((unavailable(msg)))
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#else
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#define __errorattr(msg) __attribute__((__error__(msg)))
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#endif
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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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* With bionic, you always get all C and POSIX API.
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*
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* If you want BSD and/or GNU extensions, _BSD_SOURCE and/or _GNU_SOURCE are
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* expected to be defined by callers before *any* standard header file is
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* included.
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*
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* In our header files we test against __USE_BSD and __USE_GNU.
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*/
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#if defined(_GNU_SOURCE)
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# define __USE_BSD 1
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# define __USE_GNU 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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/* _FILE_OFFSET_BITS 64 support. */
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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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/* C99 added the `restrict` type qualifier keyword. Before then, `__restrict` is a GNU extension. */
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#if __STDC_VERSION__ >= 199901L
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#define __restrict restrict
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#endif
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/* C99 added the `__func__` predefined identifier. */
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#if __STDC_VERSION__ < 199901L
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#define __func__ __PRETTY_FUNCTION__
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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 __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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#if __ANDROID_API__ < 21
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#define __BIONIC_LEGACY_INLINE static __inline
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#else
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#define __BIONIC_LEGACY_INLINE extern
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#endif
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#ifdef __clang__
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#define __AVAILABILITY(...) __attribute__((availability(android,__VA_ARGS__)))
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#else
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#define __AVAILABILITY(...)
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#endif
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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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#define __INTRODUCED_IN_FUTURE __INTRODUCED_IN(10000)
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#if __LP64__
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#define __INTRODUCED_IN_32(api_level)
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#define __INTRODUCED_IN_64 __INTRODUCED_IN
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#else
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#define __INTRODUCED_IN_32 __INTRODUCED_IN
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#define __INTRODUCED_IN_64(api_level)
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#endif
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#if defined(__arm__)
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#define __INTRODUCED_IN_ARM __INTRODUCED_IN
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#else
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#define __INTRODUCED_IN_ARM(x)
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#endif
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#if defined(__i386__)
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#define __INTRODUCED_IN_X86 __INTRODUCED_IN
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#else
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#define __INTRODUCED_IN_X86(x)
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#endif
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#if defined(__mips__)
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#define __INTRODUCED_IN_MIPS __INTRODUCED_IN
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#else
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#define __INTRODUCED_IN_MIPS(x)
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#endif
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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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extern __inline__ __always_inline __attribute__((gnu_inline))
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int __size_mul_overflow(__SIZE_TYPE__ a, __SIZE_TYPE__ b, __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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