6baf6351a1
For backwards compatibility reasons, the date library does not use the new C++17 uncaught_exception signature, even if compiling under C++17. With GCC 10, libstdc++ marks the old uncaught_exception signature as deprecated, so this causes a compilation error. Fortunately, date library provides a way to select which uncaught_exception version to use, so force using the new version. Signed-off-by: sephiroth99 <sephiroth99@gmail.com>
81 lines
2.9 KiB
C++
81 lines
2.9 KiB
C++
/**
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******************************************************************************
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* Xenia : Xbox 360 Emulator Research Project *
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******************************************************************************
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* Copyright 2020 Ben Vanik. All rights reserved. *
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* Released under the BSD license - see LICENSE in the root for more details. *
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******************************************************************************
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*/
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#ifndef XENIA_KERNEL_XCLOCK_H_
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#define XENIA_KERNEL_XCLOCK_H_
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#include <chrono>
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#include "xenia/base/clock.h"
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// https://github.com/HowardHinnant/date/commit/5ba1c1ad8514362dba596f228eb20eb13f63d948#r33275526
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#define HAS_UNCAUGHT_EXCEPTIONS 1
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#include "third_party/date/include/date/date.h"
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namespace xe {
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namespace kernel {
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struct XClock {
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using rep = int64_t;
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using period = std::ratio_multiply<std::ratio<100>, std::nano>;
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using duration = std::chrono::duration<rep, period>;
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using time_point = std::chrono::time_point<XClock>;
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static constexpr bool is_steady = false;
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static time_point now() noexcept {
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return from_file_time(Clock::QueryGuestSystemTime());
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}
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static uint64_t to_file_time(time_point const& tp) noexcept {
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return static_cast<uint64_t>(tp.time_since_epoch().count());
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}
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static time_point from_file_time(uint64_t const& tp) noexcept {
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return time_point{duration{tp}};
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}
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static std::chrono::system_clock::time_point to_sys(time_point const& tp) {
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// TODO(gibbed): verify behavior under Linux
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using sys_duration = std::chrono::system_clock::duration;
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using sys_time = std::chrono::system_clock::time_point;
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auto dp = tp;
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dp += system_clock_delta();
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auto cdp = std::chrono::time_point_cast<sys_duration>(dp);
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return sys_time{cdp.time_since_epoch()};
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}
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static time_point from_sys(std::chrono::system_clock::time_point const& tp) {
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// TODO(gibbed): verify behavior under Linux
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auto ctp = std::chrono::time_point_cast<duration>(tp);
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auto dp = time_point{ctp.time_since_epoch()};
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dp -= system_clock_delta();
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return dp;
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}
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private:
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// The delta between std::chrono::system_clock (Jan 1 1970) and Xenon file
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// time (Jan 1 1601), in seconds. In the spec std::chrono::system_clock's
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// epoch is undefined, but C++20 cements it as Jan 1 1970.
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static constexpr std::chrono::seconds system_clock_delta() {
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auto filetime_epoch = date::year{1601} / date::month{1} / date::day{1};
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auto system_clock_epoch = date::year{1970} / date::month{1} / date::day{1};
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std::chrono::system_clock::time_point fp{
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static_cast<date::sys_days>(filetime_epoch)};
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std::chrono::system_clock::time_point sp{
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static_cast<date::sys_days>(system_clock_epoch)};
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return std::chrono::floor<std::chrono::seconds>(fp.time_since_epoch() -
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sp.time_since_epoch());
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}
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};
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} // namespace kernel
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} // namespace xe
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#endif // XENIA_KERNEL_XCLOCK_H_
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