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9f3cf862e8
PerformanceTiming::monotonic_timestamp_to_wall_time_milliseconds assumes all DocumentLoadTimingInfo values are monotonic timestamps and converts them via wall_time = timestamp - epoch. This is correct for navigation_start_time (a true monotonic timestamp), but wrong for all other timing fields like load_event_end_time, dom_complete_time etc., which are stored as relative timestamps via current_high_resolution_time() (relative to time origin). The computed wall clock value ends up off by navigation_start_time, causing convert_name_to_timestamp() to return wrapped-around u64 values. This broke performance.measure() when using navigation timing attribute names as start/end marks. Add relative_timestamp_to_wall_time_milliseconds which adds back navigation_start_time before the epoch subtraction, producing correct UTC epoch ms for these fields.
63 lines
2.2 KiB
C++
63 lines
2.2 KiB
C++
/*
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* Copyright (c) 2021, Andreas Kling <andreas@ladybird.org>
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* Copyright (c) 2025, Tim Ledbetter <tim.ledbetter@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/Bindings/PerformanceTiming.h>
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#include <LibWeb/HighResolutionTime/TimeOrigin.h>
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#include <LibWeb/NavigationTiming/PerformanceTiming.h>
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namespace Web::NavigationTiming {
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GC_DEFINE_ALLOCATOR(PerformanceTiming);
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PerformanceTiming::PerformanceTiming(JS::Realm& realm)
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: PlatformObject(realm)
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{
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}
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PerformanceTiming::~PerformanceTiming() = default;
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void PerformanceTiming::initialize(JS::Realm& realm)
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{
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WEB_SET_PROTOTYPE_FOR_INTERFACE(PerformanceTiming);
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Base::initialize(realm);
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}
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DOM::DocumentLoadTimingInfo const& PerformanceTiming::document_load_timing_info(JS::Object const& global_object) const
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{
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VERIFY(is<HTML::Window>(global_object));
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auto& window = static_cast<HTML::Window const&>(global_object);
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auto document = window.document();
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return document->load_timing_info();
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}
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u64 PerformanceTiming::monotonic_timestamp_to_wall_time_milliseconds(Function<HighResolutionTime::DOMHighResTimeStamp(DOM::DocumentLoadTimingInfo const&)> selector) const
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{
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auto& global_object = HTML::relevant_global_object(*this);
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auto timestamp = selector(document_load_timing_info(global_object));
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if (timestamp == 0)
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return 0;
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auto wall_time = timestamp - HighResolutionTime::estimated_monotonic_time_of_the_unix_epoch();
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auto coarsened_time = HighResolutionTime::coarsen_time(wall_time);
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return static_cast<u64>(coarsened_time);
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}
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u64 PerformanceTiming::relative_timestamp_to_wall_time_milliseconds(Function<HighResolutionTime::DOMHighResTimeStamp(DOM::DocumentLoadTimingInfo const&)> selector) const
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{
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auto& global_object = HTML::relevant_global_object(*this);
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auto const& load_info = document_load_timing_info(global_object);
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auto relative_timestamp = selector(load_info);
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if (relative_timestamp == 0)
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return 0;
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auto absolute_timestamp = relative_timestamp + load_info.navigation_start_time;
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auto wall_time = absolute_timestamp - HighResolutionTime::estimated_monotonic_time_of_the_unix_epoch();
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auto coarsened_time = HighResolutionTime::coarsen_time(wall_time);
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return static_cast<u64>(coarsened_time);
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}
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}
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