include/lttng/bug.h

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