lib/bug.h

   1 #ifndef _LTTNG_BUG_H
   2 #define _LTTNG_BUG_H
   3
   4 /*
   5  * lib/bug.h
   6  *
   7  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; only
  12  * version 2.1 of the License.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 /**
  25  * BUILD_RUNTIME_BUG_ON - check condition at build (if constant) or runtime
  26  * @condition: the condition which should be false.
  27  *
  28  * If the condition is a constant and true, the compiler will generate a build
  29  * error. If the condition is not constant, a BUG will be triggered at runtime
  30  * if the condition is ever true. If the condition is constant and false, no
  31  * code is emitted.
  32  */
  33 #define BUILD_RUNTIME_BUG_ON(condition)                         \
  34         do {                                                    \
  35                 if (__builtin_constant_p(condition))            \
  36                         BUILD_BUG_ON(condition);                \
  37                 else                                            \
  38                         BUG_ON(condition);                      \
  39         } while (0)
  40
  41 #endif