322 lines
10 KiB
C++
322 lines
10 KiB
C++
/***
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Copyright (C) 2021 J Reece Wilson (a/k/a "Reece"). All rights reserved.
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File: Clock.cpp
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Date: 2021-6-13
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Author: Reece
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Note: Screw it, std::chrono has been widly shilled at C++11s answer to all these painful macros, asm linkage, and other shit youd have to do to pull clock
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Semantics have changed over time. I remember when, in 2016 or something like this, msvcs implementation of chrono kept breaking things.
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Every platform that remotely pretends to support a C++ toolchain has a chrono high performance clock. Any PC-like platform that uses clang and C++ more than likely uses a vendor hacked libc++ stl.
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Seems portable enough. Worst case scenario, you're on a platform with a platform-specific high res clock function you could hack into here alongside portable timezone-unaware timegm/mktime functions somewhere else.
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There is so much quirky shit one has to deal with when relying on instruction cycle counters and other such instructions, plus cycle to ~time pred, plus forced + direction only, atop non-standard [sometimes inline]
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assembly, it's just not worth it to implement a CNTVCT_EL0 / RDSC / related userland client-app attempt of a high res clock.
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I'll wave the white flag and use the STL in here for.now
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***/
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#include <Source/RuntimeInternal.hpp>
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#include "Clock.hpp"
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#if defined(AURORA_IS_MODERNNT_DERIVED)
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// TODO (Reece): ....
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// benchmarking:
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// https://github.com/microsoft/STL/issues/2085
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struct steady_clock_fast
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{ // wraps QueryPerformanceCounter
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using rep = long long;
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using period = std::nano;
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using duration = std::chrono::nanoseconds;
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using time_point = _CHRONO time_point<steady_clock_fast>;
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static constexpr bool is_steady = true;
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_NODISCARD static time_point now() noexcept
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{ // get current time
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static const long long _Freq = _Query_perf_frequency(); // doesn't change after system boot
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const long long _Ctr = _Query_perf_counter();
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static_assert(period::num == 1, "This assumes period::num == 1.");
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// Instead of just having "(_Ctr * period::den) / _Freq",
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// the algorithm below prevents overflow when _Ctr is sufficiently large.
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// It assumes that _Freq * period::den does not overflow, which is currently true for nano period.
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// It is not realistic for _Ctr to accumulate to large values from zero with this assumption,
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// but the initial value of _Ctr could be large.
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// 10 MHz is a very common QPC frequency on modern PCs. Optimizing for
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// this specific frequency can double the performance of this function by
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// avoiding the expensive frequency conversion path.
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if (_Freq == 10000000)
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{
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return time_point(duration(_Ctr * 100));
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}
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else
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{
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const long long _Whole = (_Ctr / _Freq) * period::den;
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const long long _Part = (_Ctr % _Freq) * period::den / _Freq;
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return time_point(duration(_Whole + _Part));
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}
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}
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};
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// ~3.0741 seconds
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using high_res_clock = steady_clock_fast;
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// holy fuck, we're keeping this
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// ~2x improvement
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#else
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// ~6.07 seconds
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using high_res_clock = std::chrono::high_resolution_clock;
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#endif
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using sys_clock = std::chrono::system_clock;
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#if defined(AURORA_PLATFORM_WIN32)
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#define timegm _mkgmtime
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#endif
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static sys_clock::duration gEpoch;
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static sys_clock::duration gUnixDelta;
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static auto InitEpoch()
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{
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std::tm start{0, 15, 10, 29, 7, 101, 0, 0, 0};
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auto epoch = sys_clock::from_time_t(timegm(&start)).time_since_epoch();
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std::tm unixStart{};
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unixStart.tm_mday = 1;
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unixStart.tm_year = 70;
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// dont care what the spec says, you can't trust some ms stls
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// sys_clock can have its own epoch for all we care
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auto nixEpoch = sys_clock::from_time_t(timegm(&unixStart)).time_since_epoch();
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gUnixDelta = epoch - nixEpoch;
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gEpoch = epoch;
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return 0;
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}
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static auto ___ = InitEpoch();
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template<typename T>
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static inline T NormalizeEpoch(T sysEpoch)
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{
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return sysEpoch - gEpoch;
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}
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template<typename T>
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static inline T DecodeEpoch(T auroraEpoch)
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{
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return auroraEpoch + gEpoch;
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}
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template<typename Clock_t, typename Duration_t>
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static auto TimeFromDurationSinceEpoch(Duration_t in)
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{
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auto duration = std::chrono::duration_cast<typename Clock_t::duration>(in);
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return std::chrono::time_point<Clock_t>(DecodeEpoch(duration));
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}
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template<typename Duration_t>
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static time_t CalculateTimeT(AuUInt64 in)
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{
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return sys_clock::to_time_t(TimeFromDurationSinceEpoch<sys_clock>(Duration_t(in)));
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}
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namespace Aurora::Time
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{
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AUKN_SYM time_t SToCTime(AuInt64 time)
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{
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return CalculateTimeT<std::chrono::seconds>(time);
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}
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AUKN_SYM time_t NSToCTime(AuInt64 time)
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{
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return CalculateTimeT<std::chrono::nanoseconds>(time);
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}
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AUKN_SYM time_t MSToCTime(AuInt64 time)
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{
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return CalculateTimeT<std::chrono::milliseconds>(time);
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}
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AUKN_SYM AuUInt64 CurrentClock()
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{
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return NormalizeEpoch(sys_clock::now().time_since_epoch()).count();
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}
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AUKN_SYM AuUInt64 CurrentClockMS()
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{
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return std::chrono::duration_cast<std::chrono::milliseconds>(NormalizeEpoch(sys_clock::now().time_since_epoch())).count();
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}
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AUKN_SYM AuUInt64 CurrentClockNS()
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{
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return std::chrono::duration_cast<std::chrono::nanoseconds>(NormalizeEpoch(sys_clock::now().time_since_epoch())).count();
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}
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AUKN_SYM AuInt64 CTimeToMS(time_t time)
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{
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return std::chrono::duration_cast<std::chrono::milliseconds>(NormalizeEpoch(sys_clock::from_time_t(time).time_since_epoch())).count();
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}
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AUKN_SYM AuUInt64 CurrentInternalClock()
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{
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return high_res_clock::now().time_since_epoch().count();
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}
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AUKN_SYM AuUInt64 CurrentInternalClockMS()
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{
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return std::chrono::duration_cast<std::chrono::milliseconds>(high_res_clock::now().time_since_epoch()).count();
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}
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AUKN_SYM AuUInt64 CurrentInternalClockNS()
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{
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return std::chrono::duration_cast<std::chrono::nanoseconds>(high_res_clock::now().time_since_epoch()).count();
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}
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AUKN_SYM AuInt64 ConvertAuroraToUnixMS(AuInt64 in)
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{
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return std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::milliseconds(in) + gUnixDelta).count();
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}
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AUKN_SYM AuInt64 ConvertAuroraToUnixNS(AuInt64 in)
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{
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return std::chrono::duration_cast<std::chrono::nanoseconds>(std::chrono::nanoseconds(in) + gUnixDelta).count();
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}
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AUKN_SYM AuInt64 ConvertUnixToAuroraMS(AuInt64 in)
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{
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return std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::milliseconds(in) - gUnixDelta).count();
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}
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AUKN_SYM AuInt64 ConvertUnixToAuroraNS(AuInt64 in)
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{
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return std::chrono::duration_cast<std::chrono::nanoseconds>(std::chrono::nanoseconds(in) - gUnixDelta).count();
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}
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AUKN_SYM AuUInt64 ConvertInternalToAuroraEpochMS(AuUInt64 in)
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{
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static AuInt64 epochDelta = 0;
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if (epochDelta == 0)
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{
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epochDelta = CurrentClockMS() - CurrentInternalClockMS();
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}
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return epochDelta + in;
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}
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AUKN_SYM AuUInt64 ConvertInternalToAuroraEpochNS(AuUInt64 in)
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{
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static AuInt64 epochDelta = 0;
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if (epochDelta == 0)
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{
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epochDelta = CurrentClockNS() - CurrentInternalClockNS();
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}
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return epochDelta + in;
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}
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AUKN_SYM double CPUFrequencyDeltaNS()
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{
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static double frequency = 0;
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if (frequency != 0)
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{
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return frequency;
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}
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return frequency = (static_cast<double>(high_res_clock::period::num) / static_cast<double>(high_res_clock::period::den) * 1'000'000'000.f);
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}
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AUKN_SYM double CPUFrequencyDeltaMS()
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{
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static double frequency = 0;
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if (frequency != 0)
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{
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return frequency;
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}
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return frequency = (static_cast<double>(high_res_clock::period::num) / static_cast<double>(high_res_clock::period::den) * 1'000.f);
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}
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AUKN_SYM AuUInt64 ClockJiffies()
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{
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static AuUInt64 frequency = 0;
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if (frequency != 0)
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{
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return frequency;
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}
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return frequency = static_cast<double>(high_res_clock::period::den) / static_cast<double>(high_res_clock::period::num);
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}
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AUKN_SYM tm ToCivilTime(AuInt64 time, bool UTC)
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{
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std::tm ret {};
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auto timet = MSToCTime(time);
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if (UTC)
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{
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#if defined(AURORA_COMPILER_MSVC)
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auto tm = gmtime_s(&ret, &timet);
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#else
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auto tm = gmtime_r(&timet, &ret);
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#endif
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#if defined(AURORA_COMPILER_MSVC)
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SysAssert(!tm, "couldn't convert civil time");
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#else
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SysAssert(tm, "couldn't convert civil time");
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#endif
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}
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else
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{
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#if defined(AURORA_COMPILER_MSVC)
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if (localtime_s(&ret, &timet))
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#else
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if (!localtime_r(&timet, &ret))
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#endif
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{
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AuLogWarn("Couldn't convert local civil time");
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return ToCivilTime(time, true);
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}
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}
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tm _;
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_.CopyFrom(ret);
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return _;
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}
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AUKN_SYM AuInt64 FromCivilTime(const tm &time, bool UTC)
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{
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::tm tm;
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time_t timet;
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time.CopyTo(tm);
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if (UTC)
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{
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tm.tm_isdst = 0;
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timet = timegm(&tm);
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}
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else
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{
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tm.tm_isdst = -1; // out of the 2 crts i've bothered to check, out of 3, this is legal
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timet = mktime(&tm);
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}
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if ((timet == 0) || (timet == -1))
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{
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return 0;
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}
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return std::chrono::duration_cast<std::chrono::milliseconds>(NormalizeEpoch(std::chrono::system_clock::from_time_t(timet).time_since_epoch())).count();
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}
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AUKN_SYM tm NormalizeCivilTimezone(const Time::tm &time, ETimezoneShift shift)
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{
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if ((time.tm_isdst == 0) && (shift == ETimezoneShift::eUTC))
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{
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return time;
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}
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return ToCivilTime(FromCivilTime(time, shift == ETimezoneShift::eUTC));
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}
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} |