include/lttng/bug.h

   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  *
   9  * Dual LGPL v2.1/GPL v2 license.
  10  */
  11
  12 #define BUILD_BUG_ON(condition)                                 \
  13         ((void) sizeof(char[-!!(condition)]))
  14
  15 /**
  16  * BUILD_RUNTIME_BUG_ON - check condition at build (if constant) or runtime
  17  * @condition: the condition which should be false.
  18  *
  19  * If the condition is a constant and true, the compiler will generate a build
  20  * error. If the condition is not constant, a BUG will be triggered at runtime
  21  * if the condition is ever true. If the condition is constant and false, no
  22  * code is emitted.
  23  */
  24 #define BUILD_RUNTIME_BUG_ON(condition)                         \
  25         do {                                                    \
  26                 if (__builtin_constant_p(condition))            \
  27                         BUILD_BUG_ON(condition);                \
  28                 else                                            \
  29                         BUG_ON(condition);                      \
  30         } while (0)
  31
  32 #endif