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  * 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  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  22  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  25  * SOFTWARE.
  26  */
  27
  28 #include <urcu/compiler.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31
  32 #define LTTNG_BUG_ON(condition)                                         \
  33         do {                                                            \
  34                 if (caa_unlikely(condition)) {                          \
  35                         fprintf(stderr,                                 \
  36                                 "LTTng BUG in file %s, line %d.\n",     \
  37                                 __FILE__, __LINE__);                    \
  38                         exit(EXIT_FAILURE);                             \
  39                 }                                                       \
  40         } while (0)
  41
  42 #define LTTNG_BUILD_BUG_ON(condition)                                   \
  43         ((void) sizeof(char[-!!(condition)]))
  44
  45 /**
  46  * LTTNG_BUILD_RUNTIME_BUG_ON - check condition at build (if constant) or runtime
  47  * @condition: the condition which should be false.
  48  *
  49  * If the condition is a constant and true, the compiler will generate a build
  50  * error. If the condition is not constant, a BUG will be triggered at runtime
  51  * if the condition is ever true. If the condition is constant and false, no
  52  * code is emitted.
  53  */
  54 #define LTTNG_BUILD_RUNTIME_BUG_ON(condition)                   \
  55         do {                                                    \
  56                 if (__builtin_constant_p(condition))            \
  57                         LTTNG_BUILD_BUG_ON(condition);          \
  58                 else                                            \
  59                         LTTNG_BUG_ON(condition);                \
  60         } while (0)
  61
  62 #endif