forked from M-Labs/artiq-zynq
717 lines
23 KiB
C
717 lines
23 KiB
C
/* libc/sys/linux/sys/cdefs.h - Helper macros for K&R vs. ANSI C compat. */
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/* Written 2000 by Werner Almesberger */
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/*-
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* SPDX-License-Identifier: BSD-3-Clause
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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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* $FreeBSD$
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*/
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#ifndef _SYS_CDEFS_H_
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#define _SYS_CDEFS_H_
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#include <machine/_default_types.h>
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#include <sys/features.h>
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#include <stddef.h>
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#define __PMT(args) args
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#define __DOTS , ...
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#define __THROW
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#ifdef __GNUC__
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# define __ASMNAME(cname) __XSTRING (__USER_LABEL_PREFIX__) cname
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#endif
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#define __ptr_t void *
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#define __long_double_t long double
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#define __attribute_malloc__
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#define __attribute_pure__
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#define __attribute_format_strfmon__(a,b)
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#define __flexarr [0]
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#ifndef __BOUNDED_POINTERS__
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# define __bounded /* nothing */
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# define __unbounded /* nothing */
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# define __ptrvalue /* nothing */
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#endif
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/*
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* Testing against Clang-specific extensions.
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*/
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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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#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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#if defined(__cplusplus)
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#define __BEGIN_DECLS extern "C" {
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#define __END_DECLS }
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#else
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#define __BEGIN_DECLS
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#define __END_DECLS
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#endif
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/*
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* This code has been put in place to help reduce the addition of
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* compiler specific defines in FreeBSD code. It helps to aid in
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* having a compiler-agnostic source tree.
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*/
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#if defined(__GNUC__) || defined(__INTEL_COMPILER)
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#if __GNUC__ >= 3 || defined(__INTEL_COMPILER)
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#define __GNUCLIKE_ASM 3
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#define __GNUCLIKE_MATH_BUILTIN_CONSTANTS
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#else
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#define __GNUCLIKE_ASM 2
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#endif
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#define __GNUCLIKE___TYPEOF 1
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#define __GNUCLIKE___OFFSETOF 1
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#define __GNUCLIKE___SECTION 1
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#ifndef __INTEL_COMPILER
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#define __GNUCLIKE_CTOR_SECTION_HANDLING 1
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#endif
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#define __GNUCLIKE_BUILTIN_CONSTANT_P 1
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#if defined(__INTEL_COMPILER) && defined(__cplusplus) && \
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__INTEL_COMPILER < 800
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#undef __GNUCLIKE_BUILTIN_CONSTANT_P
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#endif
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#if (__GNUC_MINOR__ > 95 || __GNUC__ >= 3)
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#define __GNUCLIKE_BUILTIN_VARARGS 1
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#define __GNUCLIKE_BUILTIN_STDARG 1
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#define __GNUCLIKE_BUILTIN_VAALIST 1
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#endif
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#if defined(__GNUC__)
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#define __GNUC_VA_LIST_COMPATIBILITY 1
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#endif
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/*
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* Compiler memory barriers, specific to gcc and clang.
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*/
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#if defined(__GNUC__)
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#define __compiler_membar() __asm __volatile(" " : : : "memory")
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#endif
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#ifndef __INTEL_COMPILER
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#define __GNUCLIKE_BUILTIN_NEXT_ARG 1
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#define __GNUCLIKE_MATH_BUILTIN_RELOPS
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#endif
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#define __GNUCLIKE_BUILTIN_MEMCPY 1
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/* XXX: if __GNUC__ >= 2: not tested everywhere originally, where replaced */
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#define __CC_SUPPORTS_INLINE 1
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#define __CC_SUPPORTS___INLINE 1
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#define __CC_SUPPORTS___INLINE__ 1
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#define __CC_SUPPORTS___FUNC__ 1
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#define __CC_SUPPORTS_WARNING 1
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#define __CC_SUPPORTS_VARADIC_XXX 1 /* see varargs.h */
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#define __CC_SUPPORTS_DYNAMIC_ARRAY_INIT 1
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#endif /* __GNUC__ || __INTEL_COMPILER */
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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 to use if it must work in non-ANSI
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* mode -- there must be no spaces between its arguments, and for nested
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* __CONCAT's, all the __CONCAT's must be at the left. __CONCAT can also
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* concatenate double-quoted strings produced by the __STRING macro, but
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* this only works with ANSI C.
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*
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* __XSTRING is like __STRING, but it expands any macros in its argument
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* first. It is only available with ANSI C.
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*/
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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 __CONCAT1(x,y) x ## y
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#define __CONCAT(x,y) __CONCAT1(x,y)
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#define __STRING(x) #x /* stringify without expanding x */
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#define __XSTRING(x) __STRING(x) /* expand x, then stringify */
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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(__CC_SUPPORTS___INLINE))
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#define __inline /* delete GCC keyword */
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#endif /* ! __CC_SUPPORTS___INLINE */
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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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#if !defined(__CC_SUPPORTS___INLINE)
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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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/*
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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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* When using a compiler other than gcc, programs using the ANSI C keywords
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* const, inline etc. as normal identifiers should define -DNO_ANSI_KEYWORDS.
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* When using "gcc -traditional", we assume that this is the intent; if
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* __GNUC__ is defined but __STDC__ is not, we leave the new keywords alone.
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*/
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#ifndef NO_ANSI_KEYWORDS
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#define const /* delete 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 /* !NO_ANSI_KEYWORDS */
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#endif /* !__CC_SUPPORTS___INLINE */
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#endif /* !(__STDC__ || __cplusplus) */
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/*
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* Compiler-dependent macros to help declare dead (non-returning) and
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* pure (no side effects) functions, and unused variables. They are
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* null except for versions of gcc that are known to support the features
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* properly (old versions of gcc-2 supported the dead and pure features
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* in a different (wrong) way). If we do not provide an implementation
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* for a given compiler, let the compile fail if it is told to use
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* a feature that we cannot live without.
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*/
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#define __weak_symbol __attribute__((__weak__))
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#if !__GNUC_PREREQ__(2, 5) && !defined(__INTEL_COMPILER)
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#define __dead2
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#define __pure2
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#define __unused
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#endif
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#if __GNUC__ == 2 && __GNUC_MINOR__ >= 5 && __GNUC_MINOR__ < 7 && !defined(__INTEL_COMPILER)
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#define __dead2 __attribute__((__noreturn__))
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#define __pure2 __attribute__((__const__))
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#define __unused
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/* XXX Find out what to do for __packed, __aligned and __section */
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#endif
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#if __GNUC_PREREQ__(2, 7) || defined(__INTEL_COMPILER)
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#define __dead2 __attribute__((__noreturn__))
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#define __pure2 __attribute__((__const__))
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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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#endif
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#if __GNUC_PREREQ__(4, 3) || __has_attribute(__alloc_size__)
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#define __alloc_size(x) __attribute__((__alloc_size__(x)))
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#define __alloc_size2(n, x) __attribute__((__alloc_size__(n, x)))
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#else
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#define __alloc_size(x)
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#define __alloc_size2(n, x)
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#endif
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#if __GNUC_PREREQ__(4, 9) || __has_attribute(__alloc_align__)
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#define __alloc_align(x) __attribute__((__alloc_align__(x)))
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#else
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#define __alloc_align(x)
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#endif
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#if !__GNUC_PREREQ__(2, 95)
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#define __alignof(x) __offsetof(struct { char __a; x __b; }, __b)
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#endif
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/*
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* Keywords added in C11.
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*/
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#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 201112L
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#if !__has_extension(c_alignas)
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#if (defined(__cplusplus) && __cplusplus >= 201103L) || \
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__has_extension(cxx_alignas)
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#define _Alignas(x) alignas(x)
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#else
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/* XXX: Only emulates _Alignas(constant-expression); not _Alignas(type-name). */
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#define _Alignas(x) __aligned(x)
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#endif
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#endif
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#if defined(__cplusplus) && __cplusplus >= 201103L
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#define _Alignof(x) alignof(x)
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#else
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#define _Alignof(x) __alignof(x)
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#endif
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#if !defined(__cplusplus) && !__has_extension(c_atomic) && \
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!__has_extension(cxx_atomic)
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/*
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* No native support for _Atomic(). Place object in structure to prevent
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* most forms of direct non-atomic access.
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*/
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#define _Atomic(T) struct { T volatile __val; }
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#endif
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#if defined(__cplusplus) && __cplusplus >= 201103L
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#define _Noreturn [[noreturn]]
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#else
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#define _Noreturn __dead2
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#endif
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#if !__has_extension(c_static_assert)
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#if (defined(__cplusplus) && __cplusplus >= 201103L) || \
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__has_extension(cxx_static_assert)
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#define _Static_assert(x, y) static_assert(x, y)
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#elif __GNUC_PREREQ__(4,6) && !defined(__cplusplus)
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/* Nothing, gcc 4.6 and higher has _Static_assert built-in */
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#elif defined(__COUNTER__)
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#define _Static_assert(x, y) __Static_assert(x, __COUNTER__)
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#define __Static_assert(x, y) ___Static_assert(x, y)
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#define ___Static_assert(x, y) typedef char __assert_ ## y[(x) ? 1 : -1] \
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__unused
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#else
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#define _Static_assert(x, y) struct __hack
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#endif
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#endif
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#if !__has_extension(c_thread_local)
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/*
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* XXX: Some compilers (Clang 3.3, GCC 4.7) falsely announce C++11 mode
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* without actually supporting the thread_local keyword. Don't check for
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* the presence of C++11 when defining _Thread_local.
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*/
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#if /* (defined(__cplusplus) && __cplusplus >= 201103L) || */ \
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__has_extension(cxx_thread_local)
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#define _Thread_local thread_local
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#else
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#define _Thread_local __thread
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#endif
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#endif
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#endif /* __STDC_VERSION__ || __STDC_VERSION__ < 201112L */
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/*
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* Emulation of C11 _Generic(). Unlike the previously defined C11
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* keywords, it is not possible to implement this using exactly the same
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* syntax. Therefore implement something similar under the name
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* __generic(). Unlike _Generic(), this macro can only distinguish
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* between a single type, so it requires nested invocations to
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* distinguish multiple cases.
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*/
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#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
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__has_extension(c_generic_selections)
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#define __generic(expr, t, yes, no) \
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_Generic(expr, t: yes, default: no)
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#elif __GNUC_PREREQ__(3, 1) && !defined(__cplusplus)
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#define __generic(expr, t, yes, no) \
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__builtin_choose_expr( \
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__builtin_types_compatible_p(__typeof(expr), t), yes, no)
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#endif
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/*
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* C99 Static array indices in function parameter declarations. Syntax such as:
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* void bar(int myArray[static 10]);
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* is allowed in C99 but not in C++. Define __min_size appropriately so
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* headers using it can be compiled in either language. Use like this:
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* void bar(int myArray[__min_size(10)]);
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*/
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#if !defined(__cplusplus) && \
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(defined(__clang__) || __GNUC_PREREQ__(4, 6)) && \
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(!defined(__STDC_VERSION__) || (__STDC_VERSION__ >= 199901))
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#define __min_size(x) static (x)
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#else
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#define __min_size(x) (x)
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#endif
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#if __GNUC_PREREQ__(2, 96)
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#define __malloc_like __attribute__((__malloc__))
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#define __pure __attribute__((__pure__))
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#else
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#define __malloc_like
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#define __pure
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#endif
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#if __GNUC_PREREQ__(3, 1) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 800)
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#define __always_inline __inline__ __attribute__((__always_inline__))
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#else
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#define __always_inline
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#endif
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#if __GNUC_PREREQ__(3, 1)
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#define __noinline __attribute__ ((__noinline__))
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#else
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#define __noinline
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#endif
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#if __GNUC_PREREQ__(3, 3)
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#define __nonnull(x) __attribute__((__nonnull__ x))
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#define __nonnull_all __attribute__((__nonnull__))
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#else
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#define __nonnull(x)
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#define __nonnull_all
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#endif
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#if __GNUC_PREREQ__(3, 4)
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#define __fastcall __attribute__((__fastcall__))
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#define __result_use_check __attribute__((__warn_unused_result__))
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#else
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#define __fastcall
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#define __result_use_check
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#endif
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#if __GNUC_PREREQ__(4, 1)
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#define __returns_twice __attribute__((__returns_twice__))
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#else
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#define __returns_twice
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#endif
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#if __GNUC_PREREQ__(4, 6) || __has_builtin(__builtin_unreachable)
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#define __unreachable() __builtin_unreachable()
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#else
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#define __unreachable() ((void)0)
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#endif
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/* XXX: should use `#if __STDC_VERSION__ < 199901'. */
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#if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
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#define __func__ NULL
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#endif
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/*
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* GCC 2.95 provides `__restrict' as an extension to C90 to support the
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* C99-specific `restrict' type qualifier. We happen to use `__restrict' as
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* a way to define the `restrict' type qualifier without disturbing older
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* software that is unaware of C99 keywords.
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*/
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#if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
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#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901
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#define __restrict
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#else
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#define __restrict restrict
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#endif
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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 utilize 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), 1)
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#define __predict_false(exp) __builtin_expect((exp), 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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|
|
|
#if __GNUC_PREREQ__(4, 0)
|
|
#define __null_sentinel __attribute__((__sentinel__))
|
|
#define __exported __attribute__((__visibility__("default")))
|
|
/* Only default visibility is supported on PE/COFF targets. */
|
|
#ifndef __CYGWIN__
|
|
#define __hidden __attribute__((__visibility__("hidden")))
|
|
#else
|
|
#define __hidden
|
|
#endif
|
|
#else
|
|
#define __null_sentinel
|
|
#define __exported
|
|
#define __hidden
|
|
#endif
|
|
|
|
#define __offsetof(type, field) offsetof(type, field)
|
|
#define __rangeof(type, start, end) \
|
|
(__offsetof(type, end) - __offsetof(type, start))
|
|
|
|
/*
|
|
* Given the pointer x to the member m of the struct s, return
|
|
* a pointer to the containing structure. When using GCC, we first
|
|
* assign pointer x to a local variable, to check that its type is
|
|
* compatible with member m.
|
|
*/
|
|
#if __GNUC_PREREQ__(3, 1)
|
|
#define __containerof(x, s, m) ({ \
|
|
const volatile __typeof(((s *)0)->m) *__x = (x); \
|
|
__DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m));\
|
|
})
|
|
#else
|
|
#define __containerof(x, s, m) \
|
|
__DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
|
|
#endif
|
|
|
|
/*
|
|
* Compiler-dependent macros to declare that functions take printf-like
|
|
* or scanf-like arguments. They are null except for versions of gcc
|
|
* that are known to support the features properly (old versions of gcc-2
|
|
* didn't permit keeping the keywords out of the application namespace).
|
|
*/
|
|
#if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
|
|
#define __printflike(fmtarg, firstvararg)
|
|
#define __scanflike(fmtarg, firstvararg)
|
|
#define __format_arg(fmtarg)
|
|
#define __strfmonlike(fmtarg, firstvararg)
|
|
#define __strftimelike(fmtarg, firstvararg)
|
|
#else
|
|
#define __printflike(fmtarg, firstvararg) \
|
|
__attribute__((__format__ (__printf__, fmtarg, firstvararg)))
|
|
#define __scanflike(fmtarg, firstvararg) \
|
|
__attribute__((__format__ (__scanf__, fmtarg, firstvararg)))
|
|
#define __format_arg(fmtarg) __attribute__((__format_arg__ (fmtarg)))
|
|
#define __strfmonlike(fmtarg, firstvararg) \
|
|
__attribute__((__format__ (__strfmon__, fmtarg, firstvararg)))
|
|
#define __strftimelike(fmtarg, firstvararg) \
|
|
__attribute__((__format__ (__strftime__, fmtarg, firstvararg)))
|
|
#endif
|
|
|
|
/* Compiler-dependent macros that rely on FreeBSD-specific extensions. */
|
|
#if defined(__FreeBSD_cc_version) && __FreeBSD_cc_version >= 300001 && \
|
|
defined(__GNUC__) && !defined(__INTEL_COMPILER)
|
|
#define __printf0like(fmtarg, firstvararg) \
|
|
__attribute__((__format__ (__printf0__, fmtarg, firstvararg)))
|
|
#else
|
|
#define __printf0like(fmtarg, firstvararg)
|
|
#endif
|
|
|
|
#if defined(__GNUC__) || defined(__INTEL_COMPILER)
|
|
#ifndef __INTEL_COMPILER
|
|
#define __strong_reference(sym,aliassym) \
|
|
extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
|
|
#endif
|
|
#ifdef __ELF__
|
|
#ifdef __STDC__
|
|
#define __weak_reference(sym,alias) \
|
|
__asm__(".weak " #alias); \
|
|
__asm__(".equ " #alias ", " #sym)
|
|
#define __warn_references(sym,msg) \
|
|
__asm__(".section .gnu.warning." #sym); \
|
|
__asm__(".asciz \"" msg "\""); \
|
|
__asm__(".previous")
|
|
#define __sym_compat(sym,impl,verid) \
|
|
__asm__(".symver " #impl ", " #sym "@" #verid)
|
|
#define __sym_default(sym,impl,verid) \
|
|
__asm__(".symver " #impl ", " #sym "@@" #verid)
|
|
#else
|
|
#define __weak_reference(sym,alias) \
|
|
__asm__(".weak alias"); \
|
|
__asm__(".equ alias, sym")
|
|
#define __warn_references(sym,msg) \
|
|
__asm__(".section .gnu.warning.sym"); \
|
|
__asm__(".asciz \"msg\""); \
|
|
__asm__(".previous")
|
|
#define __sym_compat(sym,impl,verid) \
|
|
__asm__(".symver impl, sym@verid")
|
|
#define __sym_default(impl,sym,verid) \
|
|
__asm__(".symver impl, sym@@verid")
|
|
#endif /* __STDC__ */
|
|
#else /* !__ELF__ */
|
|
#ifdef __STDC__
|
|
#define __weak_reference(sym,alias) \
|
|
__asm__(".stabs \"_" #alias "\",11,0,0,0"); \
|
|
__asm__(".stabs \"_" #sym "\",1,0,0,0")
|
|
#define __warn_references(sym,msg) \
|
|
__asm__(".stabs \"" msg "\",30,0,0,0"); \
|
|
__asm__(".stabs \"_" #sym "\",1,0,0,0")
|
|
#else
|
|
#define __weak_reference(sym,alias) \
|
|
__asm__(".stabs \"_/**/alias\",11,0,0,0"); \
|
|
__asm__(".stabs \"_/**/sym\",1,0,0,0")
|
|
#define __warn_references(sym,msg) \
|
|
__asm__(".stabs msg,30,0,0,0"); \
|
|
__asm__(".stabs \"_/**/sym\",1,0,0,0")
|
|
#endif /* __STDC__ */
|
|
#endif /* __ELF__ */
|
|
#endif /* __GNUC__ || __INTEL_COMPILER */
|
|
|
|
#ifndef __FBSDID
|
|
#define __FBSDID(s) struct __hack
|
|
#endif
|
|
|
|
#ifndef __RCSID
|
|
#define __RCSID(s) struct __hack
|
|
#endif
|
|
|
|
#ifndef __RCSID_SOURCE
|
|
#define __RCSID_SOURCE(s) struct __hack
|
|
#endif
|
|
|
|
#ifndef __SCCSID
|
|
#define __SCCSID(s) struct __hack
|
|
#endif
|
|
|
|
#ifndef __COPYRIGHT
|
|
#define __COPYRIGHT(s) struct __hack
|
|
#endif
|
|
|
|
#ifndef __DECONST
|
|
#define __DECONST(type, var) ((type)(__uintptr_t)(const void *)(var))
|
|
#endif
|
|
|
|
#ifndef __DEVOLATILE
|
|
#define __DEVOLATILE(type, var) ((type)(__uintptr_t)(volatile void *)(var))
|
|
#endif
|
|
|
|
#ifndef __DEQUALIFY
|
|
#define __DEQUALIFY(type, var) ((type)(__uintptr_t)(const volatile void *)(var))
|
|
#endif
|
|
|
|
/*
|
|
* Nullability qualifiers: currently only supported by Clang.
|
|
*/
|
|
#if !(defined(__clang__) && __has_feature(nullability))
|
|
#define _Nonnull
|
|
#define _Nullable
|
|
#define _Null_unspecified
|
|
#define __NULLABILITY_PRAGMA_PUSH
|
|
#define __NULLABILITY_PRAGMA_POP
|
|
#else
|
|
#define __NULLABILITY_PRAGMA_PUSH _Pragma("clang diagnostic push") \
|
|
_Pragma("clang diagnostic ignored \"-Wnullability-completeness\"")
|
|
#define __NULLABILITY_PRAGMA_POP _Pragma("clang diagnostic pop")
|
|
#endif
|
|
|
|
/*
|
|
* Type Safety Checking
|
|
*
|
|
* Clang provides additional attributes to enable checking type safety
|
|
* properties that cannot be enforced by the C type system.
|
|
*/
|
|
|
|
#if __has_attribute(__argument_with_type_tag__) && \
|
|
__has_attribute(__type_tag_for_datatype__)
|
|
#define __arg_type_tag(arg_kind, arg_idx, type_tag_idx) \
|
|
__attribute__((__argument_with_type_tag__(arg_kind, arg_idx, type_tag_idx)))
|
|
#define __datatype_type_tag(kind, type) \
|
|
__attribute__((__type_tag_for_datatype__(kind, type)))
|
|
#else
|
|
#define __arg_type_tag(arg_kind, arg_idx, type_tag_idx)
|
|
#define __datatype_type_tag(kind, type)
|
|
#endif
|
|
|
|
/*
|
|
* Lock annotations.
|
|
*
|
|
* Clang provides support for doing basic thread-safety tests at
|
|
* compile-time, by marking which locks will/should be held when
|
|
* entering/leaving a functions.
|
|
*
|
|
* Furthermore, it is also possible to annotate variables and structure
|
|
* members to enforce that they are only accessed when certain locks are
|
|
* held.
|
|
*/
|
|
|
|
#if __has_extension(c_thread_safety_attributes)
|
|
#define __lock_annotate(x) __attribute__((x))
|
|
#else
|
|
#define __lock_annotate(x)
|
|
#endif
|
|
|
|
/* Structure implements a lock. */
|
|
/* FIXME: Use __lockable__, etc. to avoid colliding with user namespace macros,
|
|
* once clang is fixed: https://bugs.llvm.org/show_bug.cgi?id=34319 */
|
|
#define __lockable __lock_annotate(lockable)
|
|
|
|
/* Function acquires an exclusive or shared lock. */
|
|
#define __locks_exclusive(...) \
|
|
__lock_annotate(exclusive_lock_function(__VA_ARGS__))
|
|
#define __locks_shared(...) \
|
|
__lock_annotate(shared_lock_function(__VA_ARGS__))
|
|
|
|
/* Function attempts to acquire an exclusive or shared lock. */
|
|
#define __trylocks_exclusive(...) \
|
|
__lock_annotate(exclusive_trylock_function(__VA_ARGS__))
|
|
#define __trylocks_shared(...) \
|
|
__lock_annotate(shared_trylock_function(__VA_ARGS__))
|
|
|
|
/* Function releases a lock. */
|
|
#define __unlocks(...) __lock_annotate(unlock_function(__VA_ARGS__))
|
|
|
|
/* Function asserts that an exclusive or shared lock is held. */
|
|
#define __asserts_exclusive(...) \
|
|
__lock_annotate(assert_exclusive_lock(__VA_ARGS__))
|
|
#define __asserts_shared(...) \
|
|
__lock_annotate(assert_shared_lock(__VA_ARGS__))
|
|
|
|
/* Function requires that an exclusive or shared lock is or is not held. */
|
|
#define __requires_exclusive(...) \
|
|
__lock_annotate(exclusive_locks_required(__VA_ARGS__))
|
|
#define __requires_shared(...) \
|
|
__lock_annotate(shared_locks_required(__VA_ARGS__))
|
|
#define __requires_unlocked(...) \
|
|
__lock_annotate(locks_excluded(__VA_ARGS__))
|
|
|
|
/* Function should not be analyzed. */
|
|
#define __no_lock_analysis __lock_annotate(no_thread_safety_analysis)
|
|
|
|
/* Guard variables and structure members by lock. */
|
|
#define __guarded_by(x) __lock_annotate(guarded_by(x))
|
|
#define __pt_guarded_by(x) __lock_annotate(pt_guarded_by(x))
|
|
|
|
#endif /* !_SYS_CDEFS_H_ */
|