cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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build_bug.h (2823B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _LINUX_BUILD_BUG_H
      3#define _LINUX_BUILD_BUG_H
      4
      5#include <linux/compiler.h>
      6
      7#ifdef __CHECKER__
      8#define BUILD_BUG_ON_ZERO(e) (0)
      9#else /* __CHECKER__ */
     10/*
     11 * Force a compilation error if condition is true, but also produce a
     12 * result (of value 0 and type int), so the expression can be used
     13 * e.g. in a structure initializer (or where-ever else comma expressions
     14 * aren't permitted).
     15 */
     16#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); })))
     17#endif /* __CHECKER__ */
     18
     19/* Force a compilation error if a constant expression is not a power of 2 */
     20#define __BUILD_BUG_ON_NOT_POWER_OF_2(n)	\
     21	BUILD_BUG_ON(((n) & ((n) - 1)) != 0)
     22#define BUILD_BUG_ON_NOT_POWER_OF_2(n)			\
     23	BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
     24
     25/*
     26 * BUILD_BUG_ON_INVALID() permits the compiler to check the validity of the
     27 * expression but avoids the generation of any code, even if that expression
     28 * has side-effects.
     29 */
     30#define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e))))
     31
     32/**
     33 * BUILD_BUG_ON_MSG - break compile if a condition is true & emit supplied
     34 *		      error message.
     35 * @condition: the condition which the compiler should know is false.
     36 *
     37 * See BUILD_BUG_ON for description.
     38 */
     39#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
     40
     41/**
     42 * BUILD_BUG_ON - break compile if a condition is true.
     43 * @condition: the condition which the compiler should know is false.
     44 *
     45 * If you have some code which relies on certain constants being equal, or
     46 * some other compile-time-evaluated condition, you should use BUILD_BUG_ON to
     47 * detect if someone changes it.
     48 */
     49#define BUILD_BUG_ON(condition) \
     50	BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
     51
     52/**
     53 * BUILD_BUG - break compile if used.
     54 *
     55 * If you have some code that you expect the compiler to eliminate at
     56 * build time, you should use BUILD_BUG to detect if it is
     57 * unexpectedly used.
     58 */
     59#define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed")
     60
     61/**
     62 * static_assert - check integer constant expression at build time
     63 *
     64 * static_assert() is a wrapper for the C11 _Static_assert, with a
     65 * little macro magic to make the message optional (defaulting to the
     66 * stringification of the tested expression).
     67 *
     68 * Contrary to BUILD_BUG_ON(), static_assert() can be used at global
     69 * scope, but requires the expression to be an integer constant
     70 * expression (i.e., it is not enough that __builtin_constant_p() is
     71 * true for expr).
     72 *
     73 * Also note that BUILD_BUG_ON() fails the build if the condition is
     74 * true, while static_assert() fails the build if the expression is
     75 * false.
     76 */
     77#define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
     78#define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
     79
     80#endif	/* _LINUX_BUILD_BUG_H */