src/common/bug.hpp

   1 /*
   2  * Copyright (C) 2010-2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   3  *
   4  * SPDX-License-Identifier: MIT
   5  *
   6  */
   7
   8 #ifndef _LTTNG_BUG_H
   9 #define _LTTNG_BUG_H
  10
  11 #include <urcu/compiler.h>
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14
  15 #define LTTNG_BUG_ON(condition)                                         \
  16         do {                                                            \
  17                 if (caa_unlikely(condition)) {                          \
  18                         fprintf(stderr,                                 \
  19                                 "LTTng BUG in file %s, line %d.\n",     \
  20                                 __FILE__, __LINE__);                    \
  21                         exit(EXIT_FAILURE);                             \
  22                 }                                                       \
  23         } while (0)
  24
  25 #define LTTNG_BUILD_BUG_ON(condition)                                   \
  26         ((void) sizeof(char[-!!(condition)]))
  27
  28 /**
  29  * LTTNG_BUILD_RUNTIME_BUG_ON - check condition at build (if constant) or runtime
  30  * @condition: the condition which should be false.
  31  *
  32  * If the condition is a constant and true, the compiler will generate a build
  33  * error. If the condition is not constant, a BUG will be triggered at runtime
  34  * if the condition is ever true. If the condition is constant and false, no
  35  * code is emitted.
  36  */
  37 #define LTTNG_BUILD_RUNTIME_BUG_ON(condition)                   \
  38         do {                                                    \
  39                 if (__builtin_constant_p(condition))            \
  40                         LTTNG_BUILD_BUG_ON(condition);          \
  41                 else                                            \
  42                         LTTNG_BUG_ON(condition);                \
  43         } while (0)
  44
  45 #endif