include/lttng/ust-tracer.h

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright (C) 2005-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  *
   6  * This contains the core definitions for the Linux Trace Toolkit.
   7  */
   8
   9 #ifndef _LTTNG_UST_TRACER_H
  10 #define _LTTNG_UST_TRACER_H
  11
  12 #include <limits.h>
  13
  14 #if defined (__cplusplus)
  15 #include <type_traits>
  16 #endif
  17
  18 #include <lttng/ust-compiler.h>
  19 #include <lttng/ust-config.h>
  20 #include <lttng/ust-version.h>
  21
  22 #ifndef LTTNG_UST_HAVE_EFFICIENT_UNALIGNED_ACCESS
  23 /* Align data on its natural alignment */
  24 #define RING_BUFFER_ALIGN
  25 #endif
  26
  27 #ifndef CHAR_BIT
  28 #define CHAR_BIT 8
  29 #endif
  30
  31 #ifdef RING_BUFFER_ALIGN
  32 #define lttng_alignof(type)     __alignof__(type)
  33 #else
  34 #define lttng_alignof(type)     1
  35 #endif
  36
  37 #define lttng_is_signed_type(type)           ((type) -1 < (type) 0)
  38
  39 /*
  40  * This macro adds a compilation assertion that CTF arrays and sequences
  41  * declared by the users are of an integral type.
  42  */
  43
  44 #if defined(__cplusplus)
  45 #define _lttng_is_integer(type) (std::is_integral<type>::value)
  46 #else
  47 #define _lttng_is_integer(type) (__builtin_types_compatible_p(type, _Bool) || \
  48                 __builtin_types_compatible_p(type, char) || \
  49                 __builtin_types_compatible_p(type, unsigned char) || \
  50                 __builtin_types_compatible_p(type, short) || \
  51                 __builtin_types_compatible_p(type, unsigned short) || \
  52                 __builtin_types_compatible_p(type, int) || \
  53                 __builtin_types_compatible_p(type, unsigned int) || \
  54                 __builtin_types_compatible_p(type, long) || \
  55                 __builtin_types_compatible_p(type, unsigned long) || \
  56                 __builtin_types_compatible_p(type, long long) || \
  57                 __builtin_types_compatible_p(type, unsigned long long))
  58 #endif
  59
  60 #define _lttng_array_element_type_is_supported(_type, _item) \
  61                 lttng_static_assert(_lttng_is_integer(_type), \
  62                         "Non-integer type `" #_item "` not supported as element of CTF_ARRAY or CTF_SEQUENCE", \
  63                         Non_integer_type__##_item##__not_supported_as_element_of_CTF_ARRAY_or_CTF_SEQUENCE);
  64
  65 #endif /* _LTTNG_UST_TRACER_H */