include/lttng/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  * 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 #include <urcu/compiler.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22
  23 #define LTTNG_BUG_ON(condition)                                         \
  24         do {                                                            \
  25                 if (caa_unlikely(condition)) {                          \
  26                         fprintf(stderr,                                 \
  27                                 "LTTng BUG in file %s, line %d.\n",     \
  28                                 __FILE__, __LINE__);                    \
  29                         exit(EXIT_FAILURE);                             \
  30                 }                                                       \
  31         } while (0)
  32
  33 #define LTTNG_BUILD_BUG_ON(condition)                                   \
  34         ((void) sizeof(char[-!!(condition)]))
  35
  36 /**
  37  * LTTNG_BUILD_RUNTIME_BUG_ON - check condition at build (if constant) or runtime
  38  * @condition: the condition which should be false.
  39  *
  40  * If the condition is a constant and true, the compiler will generate a build
  41  * error. If the condition is not constant, a BUG will be triggered at runtime
  42  * if the condition is ever true. If the condition is constant and false, no
  43  * code is emitted.
  44  */
  45 #define LTTNG_BUILD_RUNTIME_BUG_ON(condition)                   \
  46         do {                                                    \
  47                 if (__builtin_constant_p(condition))            \
  48                         LTTNG_BUILD_BUG_ON(condition);          \
  49                 else                                            \
  50                         LTTNG_BUG_ON(condition);                \
  51         } while (0)
  52
  53 #endif