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  * 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  *
  18  */
  19
  20 #define BUILD_BUG_ON(condition)                                 \
  21         ((void) sizeof(char[-!!(condition)]))
  22
  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