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LinuxKPI: Add static_assert() macro

Browse source 
And move it along BUILD_BUG family in to
linux/build_bug.h to match Linux.

Sponsored by:	Serenity Cyber Security, LLC
Reviewed by:	manu, bz
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D42800

(cherry picked from commit 31ef29091b0fbadefb4ccfb21e4b30ca7ddca3ed)
This commit is contained in:
Vladimir Kondratyev 2023-12-24 11:19:58 +03:00
parent 8291858235
commit c3a10c2332
2 changed files with 66 additions and 22 deletions
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65
sys/compat/linuxkpi/common/include/linux/build_bug.h Normal file
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@ -0,0 +1,65 @@
/*-
* Copyright (c) 2017 Mark Johnston <markj@FreeBSD.org>
* Copyright (c) 2018 Johannes Lundberg <johalun0@gmail.com>
* Copyright (c) 2021 The FreeBSD Foundation
* Copyright (c) 2021 Vladimir Kondratyev <wulf@FreeBSD.org>
* Copyright (c) 2023 Serenity Cyber Security, LLC
*
* Portions of this software were developed by Bjoern A. Zeeb
* under sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _LINUXKPI_LINUX_BUILD_BUG_H_
#define _LINUXKPI_LINUX_BUILD_BUG_H_
#include <sys/param.h>
#include <linux/compiler.h>
/*
* BUILD_BUG_ON() can happen inside functions where _Static_assert() does not
* seem to work. Use old-schoold-ish CTASSERT from before commit
* a3085588a88fa58eb5b1eaae471999e1995a29cf but also make sure we do not
* end up with an unused typedef or variable. The compiler should optimise
* it away entirely.
*/
#define _O_CTASSERT(x) _O__CTASSERT(x, __LINE__)
#define _O__CTASSERT(x, y) _O___CTASSERT(x, y)
#define _O___CTASSERT(x, y) while (0) { \
typedef char __assert_line_ ## y[(x) ? 1 : -1]; \
__assert_line_ ## y _x; \
_x[0] = '\0'; \
}
#define BUILD_BUG() do { CTASSERT(0); } while (0)
#define BUILD_BUG_ON(x) do { _O_CTASSERT(!(x)) } while (0)
#define BUILD_BUG_ON_MSG(x, msg) BUILD_BUG_ON(x)
#define BUILD_BUG_ON_NOT_POWER_OF_2(x) BUILD_BUG_ON(!powerof2(x))
#define BUILD_BUG_ON_INVALID(expr) while (0) { (void)(expr); }
#define BUILD_BUG_ON_ZERO(x) ((int)sizeof(struct { int:-((x) != 0); }))
#define static_assert(x, ...) __static_assert(x, ##__VA_ARGS__, #x)
#define __static_assert(x, msg, ...) _Static_assert(x, msg)
#endif

23
sys/compat/linuxkpi/common/include/linux/kernel.h
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@ -42,6 +42,7 @@
#include <sys/time.h>
#include <linux/bitops.h>
#include <linux/build_bug.h>
#include <linux/compiler.h>
#include <linux/stringify.h>
#include <linux/errno.h>
@ -91,28 +92,6 @@
#define S64_C(x) x ## LL
#define U64_C(x) x ## ULL
/*
* BUILD_BUG_ON() can happen inside functions where _Static_assert() does not
* seem to work. Use old-schoold-ish CTASSERT from before commit
* a3085588a88fa58eb5b1eaae471999e1995a29cf but also make sure we do not
* end up with an unused typedef or variable. The compiler should optimise
* it away entirely.
*/
#define _O_CTASSERT(x) _O__CTASSERT(x, __LINE__)
#define _O__CTASSERT(x, y) _O___CTASSERT(x, y)
#define _O___CTASSERT(x, y) while (0) { \
typedef char __unused __assert_line_ ## y[(x) ? 1 : -1]; \
__assert_line_ ## y _x; \
_x[0] = '\0'; \
}
#define BUILD_BUG() do { CTASSERT(0); } while (0)
#define BUILD_BUG_ON(x) do { _O_CTASSERT(!(x)) } while (0)
#define BUILD_BUG_ON_MSG(x, msg) BUILD_BUG_ON(x)
#define BUILD_BUG_ON_NOT_POWER_OF_2(x) BUILD_BUG_ON(!powerof2(x))
#define BUILD_BUG_ON_INVALID(expr) while (0) { (void)(expr); }
#define BUILD_BUG_ON_ZERO(x) ((int)sizeof(struct { int:-((x) != 0); }))
#define BUG() panic("BUG at %s:%d", __FILE__, __LINE__)
#define BUG_ON(cond) do { \
if (cond) { \