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80 lines
2.8 KiB
80 lines
2.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_BUILD_BUG_H |
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#define _LINUX_BUILD_BUG_H |
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#include <linux/compiler.h> |
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#ifdef __CHECKER__ |
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#define BUILD_BUG_ON_ZERO(e) (0) |
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#else /* __CHECKER__ */ |
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/* |
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* Force a compilation error if condition is true, but also produce a |
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* result (of value 0 and type int), so the expression can be used |
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* e.g. in a structure initializer (or where-ever else comma expressions |
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* aren't permitted). |
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*/ |
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#define BUILD_BUG_ON_ZERO(e) ((int)(sizeof(struct { int:(-!!(e)); }))) |
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#endif /* __CHECKER__ */ |
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/* Force a compilation error if a constant expression is not a power of 2 */ |
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#define __BUILD_BUG_ON_NOT_POWER_OF_2(n) \ |
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BUILD_BUG_ON(((n) & ((n) - 1)) != 0) |
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#define BUILD_BUG_ON_NOT_POWER_OF_2(n) \ |
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BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0)) |
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/* |
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* BUILD_BUG_ON_INVALID() permits the compiler to check the validity of the |
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* expression but avoids the generation of any code, even if that expression |
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* has side-effects. |
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*/ |
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#define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e)))) |
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/** |
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* BUILD_BUG_ON_MSG - break compile if a condition is true & emit supplied |
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* error message. |
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* @condition: the condition which the compiler should know is false. |
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* |
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* See BUILD_BUG_ON for description. |
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*/ |
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#define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) |
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/** |
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* BUILD_BUG_ON - break compile if a condition is true. |
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* @condition: the condition which the compiler should know is false. |
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* |
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* If you have some code which relies on certain constants being equal, or |
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* some other compile-time-evaluated condition, you should use BUILD_BUG_ON to |
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* detect if someone changes it. |
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*/ |
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#define BUILD_BUG_ON(condition) \ |
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BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) |
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/** |
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* BUILD_BUG - break compile if used. |
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* |
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* If you have some code that you expect the compiler to eliminate at |
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* build time, you should use BUILD_BUG to detect if it is |
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* unexpectedly used. |
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*/ |
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#define BUILD_BUG() BUILD_BUG_ON_MSG(1, "BUILD_BUG failed") |
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/** |
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* static_assert - check integer constant expression at build time |
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* |
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* static_assert() is a wrapper for the C11 _Static_assert, with a |
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* little macro magic to make the message optional (defaulting to the |
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* stringification of the tested expression). |
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* |
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* Contrary to BUILD_BUG_ON(), static_assert() can be used at global |
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* scope, but requires the expression to be an integer constant |
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* expression (i.e., it is not enough that __builtin_constant_p() is |
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* true for expr). |
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* |
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* Also note that BUILD_BUG_ON() fails the build if the condition is |
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* true, while static_assert() fails the build if the expression is |
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* false. |
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*/ |
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#define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr) |
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#define __static_assert(expr, msg, ...) _Static_assert(expr, msg) |
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#endif /* _LINUX_BUILD_BUG_H */
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