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1 | #ifndef _LTTNG_BUG_H |
2 | #define _LTTNG_BUG_H | |
3 | ||
4 | /* | |
5 | * lib/bug.h | |
6 | * | |
7 | * (C) Copyright 2010-2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
8 | * | |
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9 | * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED |
10 | * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. | |
11 | * | |
12 | * Permission is hereby granted to use or copy this program | |
13 | * for any purpose, provided the above notices are retained on all copies. | |
14 | * Permission to modify the code and to distribute modified code is granted, | |
15 | * provided the above notices are retained, and a notice that the code was | |
16 | * modified is included with the above copyright notice. | |
17 | * | |
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18 | */ |
19 | ||
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20 | #define BUILD_BUG_ON(condition) \ |
21 | ((void) sizeof(char[-!!(condition)])) | |
22 | ||
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23 | /** |
24 | * BUILD_RUNTIME_BUG_ON - check condition at build (if constant) or runtime | |
25 | * @condition: the condition which should be false. | |
26 | * | |
27 | * If the condition is a constant and true, the compiler will generate a build | |
28 | * error. If the condition is not constant, a BUG will be triggered at runtime | |
29 | * if the condition is ever true. If the condition is constant and false, no | |
30 | * code is emitted. | |
31 | */ | |
32 | #define BUILD_RUNTIME_BUG_ON(condition) \ | |
33 | do { \ | |
34 | if (__builtin_constant_p(condition)) \ | |
35 | BUILD_BUG_ON(condition); \ | |
36 | else \ | |
37 | BUG_ON(condition); \ | |
38 | } while (0) | |
39 | ||
40 | #endif |