39 lines
1.4 KiB
C++
39 lines
1.4 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#pragma once
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#include <cassert>
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#include <react/timing/primitives.h>
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namespace facebook::react::jsinspector_modern::tracing {
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// The Tracing Clock time origin is the steady_clock epoch. This is mostly done
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// to replicate Chromium's behavior, but also saves us from aligning custom
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// DOMHighResTimeStamps that can be specified in performance.mark /
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// performance.measure calls: these should not extend the timeline window, this
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// is the current approach in Chromium.
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constexpr HighResTimeStamp TRACING_TIME_ORIGIN =
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HighResTimeStamp::fromChronoSteadyClockTimePoint(std::chrono::steady_clock::time_point());
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// Tracing timestamps are represented a time value in microseconds since
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// arbitrary time origin (epoch) with no fractional part.
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inline uint64_t highResTimeStampToTracingClockTimeStamp(HighResTimeStamp timestamp)
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{
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assert(timestamp >= TRACING_TIME_ORIGIN && "Provided timestamp is before time origin");
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auto duration = timestamp - TRACING_TIME_ORIGIN;
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return static_cast<uint64_t>(static_cast<double>(duration.toNanoseconds()) / 1e3);
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}
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inline int64_t highResDurationToTracingClockDuration(HighResDuration duration)
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{
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return static_cast<int64_t>(static_cast<double>(duration.toNanoseconds()) / 1e3);
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}
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} // namespace facebook::react::jsinspector_modern::tracing
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