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fe21244b05
The __has_builtin operator is more specific and is supported by GCC and Clang, while __is_identifier() is less specific and only supported by Clang, so we should prefer the former whenever it is available, and only fallback to use the latter when the former is missing and the latter.
261 lines
6.9 KiB
C
261 lines
6.9 KiB
C
/*
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* Copyright © 2004-2006, 2009-2011 Guillem Jover <guillem@hadrons.org>
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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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __has_include
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#define __has_include(x) 1
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#endif
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#ifndef __has_include_next
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#define __has_include_next(x) 1
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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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/* Clang expands this to 1 if an identifier is *not* reserved. */
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#ifndef __is_identifier
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#define __is_identifier(x) 1
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#endif
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#ifndef __has_builtin
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#define __has_builtin(x) !__is_identifier(x)
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#endif
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#ifdef LIBBSD_OVERLAY
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/*
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* Some libc implementations do not have a <sys/cdefs.h>, in particular
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* musl, try to handle this gracefully.
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*/
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#if __has_include_next(<sys/cdefs.h>)
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#include_next <sys/cdefs.h>
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#endif
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#else
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#if __has_include(<sys/cdefs.h>)
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#include <sys/cdefs.h>
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#endif
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#endif
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#ifndef LIBBSD_SYS_CDEFS_H
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#define LIBBSD_SYS_CDEFS_H
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#ifndef __BEGIN_DECLS
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#ifdef __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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#endif
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/*
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* On non-glibc based systems, we cannot unconditionally use the
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* __GLIBC_PREREQ macro as it gets expanded before evaluation.
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*/
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#ifndef __GLIBC_PREREQ
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#define __GLIBC_PREREQ(maj, min) 0
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#endif
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/*
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* Some kFreeBSD headers expect those macros to be set for sanity checks.
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*/
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#ifndef _SYS_CDEFS_H_
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#define _SYS_CDEFS_H_
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#endif
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#ifndef _SYS_CDEFS_H
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#define _SYS_CDEFS_H
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#endif
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#define LIBBSD_CONCAT(x, y) x ## y
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#define LIBBSD_STRING(x) #x
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#ifdef __GNUC__
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#define LIBBSD_GCC_VERSION (__GNUC__ << 8 | __GNUC_MINOR__)
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#else
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#define LIBBSD_GCC_VERSION 0
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#endif
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#if LIBBSD_GCC_VERSION >= 0x0405 || __has_attribute(__deprecated__)
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#define LIBBSD_DEPRECATED(x) __attribute__((__deprecated__(x)))
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#elif LIBBSD_GCC_VERSION >= 0x0301
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#define LIBBSD_DEPRECATED(x) __attribute__((__deprecated__))
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#else
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#define LIBBSD_DEPRECATED(x)
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#endif
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#if LIBBSD_GCC_VERSION >= 0x0200 || defined(__clang__)
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#define LIBBSD_REDIRECT(name, proto, alias) name proto __asm__(LIBBSD_ASMNAME(#alias))
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#endif
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#define LIBBSD_ASMNAME(cname) LIBBSD_ASMNAME_PREFIX(__USER_LABEL_PREFIX__, cname)
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#define LIBBSD_ASMNAME_PREFIX(prefix, cname) LIBBSD_STRING(prefix) cname
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#ifndef __dead2
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# if LIBBSD_GCC_VERSION >= 0x0207 || __has_attribute(__noreturn__)
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# define __dead2 __attribute__((__noreturn__))
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# else
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# define __dead2
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# endif
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#endif
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#ifndef __pure2
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# if LIBBSD_GCC_VERSION >= 0x0207 || __has_attribute(__const__)
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# define __pure2 __attribute__((__const__))
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# else
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# define __pure2
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# endif
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#endif
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#ifndef __packed
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# if LIBBSD_GCC_VERSION >= 0x0207 || __has_attribute(__packed__)
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# define __packed __attribute__((__packed__))
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# else
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# define __packed
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# endif
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#endif
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#ifndef __aligned
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# if LIBBSD_GCC_VERSION >= 0x0207 || __has_attribute(__aligned__)
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# define __aligned(x) __attribute__((__aligned__(x)))
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# else
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# define __aligned(x)
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# endif
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#endif
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/* Linux headers define a struct with a member names __unused.
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* Debian bugs: #522773 (linux), #522774 (libc).
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* Disable for now. */
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#if 0
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#ifndef __unused
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# if LIBBSD_GCC_VERSION >= 0x0300
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# define __unused __attribute__((__unused__))
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# else
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# define __unused
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# endif
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#endif
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#endif
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#ifndef __printflike
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# if LIBBSD_GCC_VERSION >= 0x0300 || __has_attribute(__format__)
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# define __printflike(x, y) __attribute((__format__(__printf__, (x), (y))))
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# else
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# define __printflike(x, y)
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# endif
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#endif
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#ifndef __nonnull
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# if LIBBSD_GCC_VERSION >= 0x0302 || __has_attribute(__nonnull__)
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# define __nonnull(x) __attribute__((__nonnull__(x)))
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# else
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# define __nonnull(x)
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# endif
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#endif
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#ifndef __bounded__
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# define __bounded__(x, y, z)
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#endif
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/*
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* Return the number of elements in a statically-allocated array,
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* __x.
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*/
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#define __arraycount(__x) (sizeof(__x) / sizeof(__x[0]))
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/*
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* We define this here since <stddef.h>, <sys/queue.h>, and <sys/types.h>
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* require it.
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*/
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#ifndef __offsetof
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# if LIBBSD_GCC_VERSION >= 0x0401 || __has_builtin(__builtin_offsetof)
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# define __offsetof(type, field) __builtin_offsetof(type, field)
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# else
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# ifndef __cplusplus
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# define __offsetof(type, field) \
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((size_t)(uintptr_t)((const volatile void *)&((type *)0)->field))
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# else
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# define __offsetof(type, field) \
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(__offsetof__ (reinterpret_cast <size_t> \
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(&reinterpret_cast <const volatile char &> \
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(static_cast<type *> (0)->field))))
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# endif
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# endif
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#endif
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#define __rangeof(type, start, end) \
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(__offsetof(type, end) - __offsetof(type, start))
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/*
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* Given the pointer x to the member m of the struct s, return
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* a pointer to the containing structure. When using GCC, we first
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* assign pointer x to a local variable, to check that its type is
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* compatible with member m.
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*/
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#ifndef __containerof
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# if LIBBSD_GCC_VERSION >= 0x0301 || !__is_identifier(__typeof__)
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# define __containerof(x, s, m) ({ \
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const volatile __typeof__(((s *)0)->m) *__x = (x); \
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__DEQUALIFY(s *, (const volatile char *)__x - __offsetof(s, m)); \
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})
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# else
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# define __containerof(x, s, m) \
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__DEQUALIFY(s *, (const volatile char *)(x) - __offsetof(s, m))
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# endif
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#endif
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#ifndef __RCSID
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# define __RCSID(x)
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#endif
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#ifndef __FBSDID
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# define __FBSDID(x)
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#endif
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#ifndef __RCSID
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# define __RCSID(x)
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#endif
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#ifndef __RCSID_SOURCE
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# define __RCSID_SOURCE(x)
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#endif
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#ifndef __SCCSID
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# define __SCCSID(x)
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#endif
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#ifndef __COPYRIGHT
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# define __COPYRIGHT(x)
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#endif
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#ifndef __DECONST
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#define __DECONST(type, var) ((type)(uintptr_t)(const void *)(var))
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#endif
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#ifndef __DEVOLATILE
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#define __DEVOLATILE(type, var) ((type)(uintptr_t)(volatile void *)(var))
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#endif
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#ifndef __DEQUALIFY
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#define __DEQUALIFY(type, var) ((type)(uintptr_t)(const volatile void *)(var))
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#endif
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#endif
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