include/side/macros.h

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright 2022 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  */
   5
   6 #ifndef _SIDE_MACROS_H
   7 #define _SIDE_MACROS_H
   8
   9 /* Helper macros */
  10
  11 #define SIDE_ARRAY_SIZE(arr)    (sizeof(arr) / sizeof((arr)[0]))
  12
  13 /*
  14  * Compound literals with static storage are needed by SIDE
  15  * instrumentation.
  16  * Compound literals are part of the C99 and C11 standards, but not
  17  * part of the C++ standards. They are supported by most C++ compilers
  18  * though.
  19  *
  20  * Example use:
  21  * static struct mystruct *var = LTTNG_UST_COMPOUND_LITERAL(struct mystruct, { 1, 2, 3 });
  22  */
  23 #define SIDE_COMPOUND_LITERAL(type, ...)   (type[]) { __VA_ARGS__ }
  24
  25 #define side_likely(x)          __builtin_expect(!!(x), 1)
  26 #define side_unlikely(x)        __builtin_expect(!!(x), 0)
  27
  28 #define SIDE_PARAM(...) __VA_ARGS__
  29
  30 #endif /* _SIDE_MACROS_H */