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-arch.h>
  19 #include <lttng/ust-compiler.h>
  20 #include <lttng/ust-config.h>
  21 #include <lttng/ust-version.h>
  22
  23 #ifndef LTTNG_UST_ARCH_HAS_EFFICIENT_UNALIGNED_ACCESS
  24 /* Align data on its natural alignment */
  25 #define RING_BUFFER_ALIGN
  26 #endif
  27
  28 #ifndef CHAR_BIT
  29 #define CHAR_BIT 8
  30 #endif
  31
  32 #ifdef RING_BUFFER_ALIGN
  33 #define lttng_alignof(type)     __alignof__(type)
  34 #else
  35 #define lttng_alignof(type)     1
  36 #endif
  37
  38 #define lttng_is_signed_type(type)           ((type) -1 < (type) 0)
  39
  40 /*
  41  * This macro adds a compilation assertion that CTF arrays and sequences
  42  * declared by the users are of an integral type.
  43  */
  44
  45 #if defined(__cplusplus)
  46 #define _lttng_is_integer(type) (std::is_integral<type>::value)
  47 #else
  48 #define _lttng_is_integer(type) (__builtin_types_compatible_p(type, _Bool) || \
  49                 __builtin_types_compatible_p(type, char) || \
  50                 __builtin_types_compatible_p(type, unsigned char) || \
  51                 __builtin_types_compatible_p(type, short) || \
  52                 __builtin_types_compatible_p(type, unsigned short) || \
  53                 __builtin_types_compatible_p(type, int) || \
  54                 __builtin_types_compatible_p(type, unsigned int) || \
  55                 __builtin_types_compatible_p(type, long) || \
  56                 __builtin_types_compatible_p(type, unsigned long) || \
  57                 __builtin_types_compatible_p(type, long long) || \
  58                 __builtin_types_compatible_p(type, unsigned long long))
  59 #endif
  60
  61 #define _lttng_array_element_type_is_supported(_type, _item) \
  62                 lttng_static_assert(_lttng_is_integer(_type), \
  63                         "Non-integer type `" #_item "` not supported as element of CTF_ARRAY or CTF_SEQUENCE", \
  64                         Non_integer_type__##_item##__not_supported_as_element_of_CTF_ARRAY_or_CTF_SEQUENCE);
  65
  66 #endif /* _LTTNG_UST_TRACER_H */