src/cpp-common/bt2/clock-class.hpp

   1 /*
   2  * Copyright (c) 2020 Philippe Proulx <pproulx@efficios.com>
   3  *
   4  * SPDX-License-Identifier: MIT
   5  */
   6
   7 #ifndef BABELTRACE_CPP_COMMON_BT2_CLOCK_CLASS_HPP
   8 #define BABELTRACE_CPP_COMMON_BT2_CLOCK_CLASS_HPP
   9
  10 #include <cstdint>
  11 #include <type_traits>
  12
  13 #include <babeltrace2/babeltrace.h>
  14
  15 #include "cpp-common/bt2c/c-string-view.hpp"
  16 #include "cpp-common/bt2c/uuid.hpp"
  17 #include "cpp-common/bt2s/optional.hpp"
  18
  19 #include "borrowed-object.hpp"
  20 #include "exc.hpp"
  21 #include "internal/utils.hpp"
  22 #include "shared-object.hpp"
  23 #include "value.hpp"
  24
  25 namespace bt2 {
  26 namespace internal {
  27
  28 struct ClockClassRefFuncs final
  29 {
  30     static void get(const bt_clock_class * const libObjPtr) noexcept
  31     {
  32         bt_clock_class_get_ref(libObjPtr);
  33     }
  34
  35     static void put(const bt_clock_class * const libObjPtr) noexcept
  36     {
  37         bt_clock_class_put_ref(libObjPtr);
  38     }
  39 };
  40
  41 template <typename LibObjT>
  42 struct CommonClockClassSpec;
  43
  44 /* Functions specific to mutable clock classes */
  45 template <>
  46 struct CommonClockClassSpec<bt_clock_class> final
  47 {
  48     static bt_value *userAttributes(bt_clock_class * const libObjPtr) noexcept
  49     {
  50         return bt_clock_class_borrow_user_attributes(libObjPtr);
  51     }
  52 };
  53
  54 /* Functions specific to constant clock classes */
  55 template <>
  56 struct CommonClockClassSpec<const bt_clock_class> final
  57 {
  58     static const bt_value *userAttributes(const bt_clock_class * const libObjPtr) noexcept
  59     {
  60         return bt_clock_class_borrow_user_attributes_const(libObjPtr);
  61     }
  62 };
  63
  64 } /* namespace internal */
  65
  66 class ClockClassOffset final
  67 {
  68 public:
  69     explicit ClockClassOffset(const std::int64_t seconds, const std::uint64_t cycles) :
  70         _mSeconds {seconds}, _mCycles {cycles}
  71     {
  72     }
  73
  74     std::int64_t seconds() const noexcept
  75     {
  76         return _mSeconds;
  77     }
  78
  79     std::uint64_t cycles() const noexcept
  80     {
  81         return _mCycles;
  82     }
  83
  84 private:
  85     std::int64_t _mSeconds;
  86     std::uint64_t _mCycles;
  87 };
  88
  89 template <typename LibObjT>
  90 class CommonClockClass final : public BorrowedObject<LibObjT>
  91 {
  92 private:
  93     using typename BorrowedObject<LibObjT>::_ThisBorrowedObject;
  94
  95 public:
  96     using typename BorrowedObject<LibObjT>::LibObjPtr;
  97     using Shared = SharedObject<CommonClockClass, LibObjT, internal::ClockClassRefFuncs>;
  98     using UserAttributes = internal::DepUserAttrs<LibObjT>;
  99
 100     explicit CommonClockClass(const LibObjPtr libObjPtr) noexcept : _ThisBorrowedObject {libObjPtr}
 101     {
 102     }
 103
 104     template <typename OtherLibObjT>
 105     CommonClockClass(const CommonClockClass<OtherLibObjT> clkClass) noexcept :
 106         _ThisBorrowedObject {clkClass}
 107     {
 108     }
 109
 110     template <typename OtherLibObjT>
 111     CommonClockClass& operator=(const CommonClockClass<OtherLibObjT> clkClass) noexcept
 112     {
 113         _ThisBorrowedObject::operator=(clkClass);
 114         return *this;
 115     }
 116
 117     CommonClockClass<const bt_clock_class> asConst() const noexcept
 118     {
 119         return CommonClockClass<const bt_clock_class> {*this};
 120     }
 121
 122     void frequency(const std::uint64_t frequency) const noexcept
 123     {
 124         static_assert(!std::is_const<LibObjT>::value, "Not available with `bt2::ConstClockClass`.");
 125
 126         bt_clock_class_set_frequency(this->libObjPtr(), frequency);
 127     }
 128
 129     std::uint64_t frequency() const noexcept
 130     {
 131         return bt_clock_class_get_frequency(this->libObjPtr());
 132     }
 133
 134     void offset(const ClockClassOffset& offset) const noexcept
 135     {
 136         static_assert(!std::is_const<LibObjT>::value, "Not available with `bt2::ConstClockClass`.");
 137
 138         bt_clock_class_set_offset(this->libObjPtr(), offset.seconds(), offset.cycles());
 139     }
 140
 141     ClockClassOffset offset() const noexcept
 142     {
 143         std::int64_t seconds;
 144         std::uint64_t cycles;
 145
 146         bt_clock_class_get_offset(this->libObjPtr(), &seconds, &cycles);
 147         return ClockClassOffset {seconds, cycles};
 148     }
 149
 150     void precision(const std::uint64_t precision) const noexcept
 151     {
 152         static_assert(!std::is_const<LibObjT>::value, "Not available with `bt2::ConstClockClass`.");
 153
 154         bt_clock_class_set_precision(this->libObjPtr(), precision);
 155     }
 156
 157     std::uint64_t precision() const noexcept
 158     {
 159         return bt_clock_class_get_precision(this->libObjPtr());
 160     }
 161
 162     void originIsUnixEpoch(const bool originIsUnixEpoch) const noexcept
 163     {
 164         static_assert(!std::is_const<LibObjT>::value, "Not available with `bt2::ConstClockClass`.");
 165
 166         bt_clock_class_set_origin_is_unix_epoch(this->libObjPtr(),
 167                                                 static_cast<bt_bool>(originIsUnixEpoch));
 168     }
 169
 170     bool originIsUnixEpoch() const noexcept
 171     {
 172         return static_cast<bool>(bt_clock_class_origin_is_unix_epoch(this->libObjPtr()));
 173     }
 174
 175     void name(const bt2c::CStringView name) const
 176     {
 177         static_assert(!std::is_const<LibObjT>::value, "Not available with `bt2::ConstClockClass`.");
 178
 179         const auto status = bt_clock_class_set_name(this->libObjPtr(), name);
 180
 181         if (status == BT_CLOCK_CLASS_SET_NAME_STATUS_MEMORY_ERROR) {
 182             throw MemoryError {};
 183         }
 184     }
 185
 186     bt2c::CStringView name() const noexcept
 187     {
 188         return bt_clock_class_get_name(this->libObjPtr());
 189     }
 190
 191     void description(const bt2c::CStringView description) const
 192     {
 193         static_assert(!std::is_const<LibObjT>::value, "Not available with `bt2::ConstClockClass`.");
 194
 195         const auto status = bt_clock_class_set_description(this->libObjPtr(), description);
 196
 197         if (status == BT_CLOCK_CLASS_SET_DESCRIPTION_STATUS_MEMORY_ERROR) {
 198             throw MemoryError {};
 199         }
 200     }
 201
 202     bt2c::CStringView description() const noexcept
 203     {
 204         return bt_clock_class_get_description(this->libObjPtr());
 205     }
 206
 207     void uuid(const std::uint8_t * const uuid) const noexcept
 208     {
 209         bt_clock_class_set_uuid(this->libObjPtr(), uuid);
 210     }
 211
 212     bt2s::optional<bt2c::UuidView> uuid() const noexcept
 213     {
 214         const auto uuid = bt_clock_class_get_uuid(this->libObjPtr());
 215
 216         if (uuid) {
 217             return bt2c::UuidView {uuid};
 218         }
 219
 220         return bt2s::nullopt;
 221     }
 222
 223     template <typename LibValT>
 224     void userAttributes(const CommonMapValue<LibValT> userAttrs) const noexcept
 225     {
 226         static_assert(!std::is_const<LibObjT>::value, "Not available with `bt2::ConstClockClass`.");
 227
 228         bt_clock_class_set_user_attributes(this->libObjPtr(), userAttrs.libObjPtr());
 229     }
 230
 231     UserAttributes userAttributes() const noexcept
 232     {
 233         return UserAttributes {
 234             internal::CommonClockClassSpec<LibObjT>::userAttributes(this->libObjPtr())};
 235     }
 236
 237     std::int64_t cyclesToNsFromOrigin(const std::uint64_t value) const
 238     {
 239         std::int64_t nsFromOrigin;
 240         const auto status =
 241             bt_clock_class_cycles_to_ns_from_origin(this->libObjPtr(), value, &nsFromOrigin);
 242
 243         if (status == BT_CLOCK_CLASS_CYCLES_TO_NS_FROM_ORIGIN_STATUS_OVERFLOW_ERROR) {
 244             throw OverflowError {};
 245         }
 246
 247         return nsFromOrigin;
 248     }
 249
 250     Shared shared() const noexcept
 251     {
 252         return Shared::createWithRef(*this);
 253     }
 254 };
 255
 256 using ClockClass = CommonClockClass<bt_clock_class>;
 257 using ConstClockClass = CommonClockClass<const bt_clock_class>;
 258
 259 namespace internal {
 260
 261 struct ClockClassTypeDescr
 262 {
 263     using Const = ConstClockClass;
 264     using NonConst = ClockClass;
 265 };
 266
 267 template <>
 268 struct TypeDescr<ClockClass> : public ClockClassTypeDescr
 269 {
 270 };
 271
 272 template <>
 273 struct TypeDescr<ConstClockClass> : public ClockClassTypeDescr
 274 {
 275 };
 276
 277 } /* namespace internal */
 278 } /* namespace bt2 */
 279
 280 #endif /* BABELTRACE_CPP_COMMON_BT2_CLOCK_CLASS_HPP */