src/common/bug.h

   1 #ifndef _LTTNG_BUG_H
   2 #define _LTTNG_BUG_H
   3
   4 /*
   5  * lttng/bug.h
   6  *
   7  * (C) Copyright 2010-2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  */
  19
  20 #include <urcu/compiler.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23
  24 #define LTTNG_BUG_ON(condition)                                         \
  25         do {                                                            \
  26                 if (caa_unlikely(condition)) {                          \
  27                         fprintf(stderr,                                 \
  28                                 "LTTng BUG in file %s, line %d.\n",     \
  29                                 __FILE__, __LINE__);                    \
  30                         exit(EXIT_FAILURE);                             \
  31                 }                                                       \
  32         } while (0)
  33
  34 #define LTTNG_BUILD_BUG_ON(condition)                                   \
  35         ((void) sizeof(char[-!!(condition)]))
  36
  37 /**
  38  * LTTNG_BUILD_RUNTIME_BUG_ON - check condition at build (if constant) or runtime
  39  * @condition: the condition which should be false.
  40  *
  41  * If the condition is a constant and true, the compiler will generate a build
  42  * error. If the condition is not constant, a BUG will be triggered at runtime
  43  * if the condition is ever true. If the condition is constant and false, no
  44  * code is emitted.
  45  */
  46 #define LTTNG_BUILD_RUNTIME_BUG_ON(condition)                   \
  47         do {                                                    \
  48                 if (__builtin_constant_p(condition))            \
  49                         LTTNG_BUILD_BUG_ON(condition);          \
  50                 else                                            \
  51                         LTTNG_BUG_ON(condition);                \
  52         } while (0)
  53
  54 #endif