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 <stdio.h>
  12 #include <stdlib.h>
  13 #include <urcu/compiler.h>
  14
  15 #define LTTNG_BUG_ON(condition)                                                                  \
  16         do {                                                                                     \
  17                 if (caa_unlikely(condition)) {                                                   \
  18                         fprintf(stderr, "LTTng BUG in file %s, line %d.\n", __FILE__, __LINE__); \
  19                         exit(EXIT_FAILURE);                                                      \
  20                 }                                                                                \
  21         } while (0)
  22
  23 #define LTTNG_BUILD_BUG_ON(condition) ((void) sizeof(char[-!!(condition)]))
  24
  25 /**
  26  * LTTNG_BUILD_RUNTIME_BUG_ON - check condition at build (if constant) or runtime
  27  * @condition: the condition which should be false.
  28  *
  29  * If the condition is a constant and true, the compiler will generate a build
  30  * error. If the condition is not constant, a BUG will be triggered at runtime
  31  * if the condition is ever true. If the condition is constant and false, no
  32  * code is emitted.
  33  */
  34 #define LTTNG_BUILD_RUNTIME_BUG_ON(condition)          \
  35         do {                                           \
  36                 if (__builtin_constant_p(condition))   \
  37                         LTTNG_BUILD_BUG_ON(condition); \
  38                 else                                   \
  39                         LTTNG_BUG_ON(condition);       \
  40         } while (0)
  41
  42 #endif