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LibWeb: Report performance based timestamps relative to ESO time origin

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This commit is contained in:
Tim Ledbetter
2025-01-07 10:08:14 +00:00
committed by Alexander Kalenik
parent 8963e62a5e
commit 7488136a51
12 changed files with 248 additions and 28 deletions
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38
Libraries/LibWeb/HighResolutionTime/TimeOrigin.cpp
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@@ -11,23 +11,15 @@
namespace Web::HighResolutionTime {
// https://w3c.github.io/hr-time/#dfn-get-time-origin-timestamp
DOMHighResTimeStamp get_time_origin_timestamp(JS::Object const& global)
// https://w3c.github.io/hr-time/#dfn-estimated-monotonic-time-of-the-unix-epoch
DOMHighResTimeStamp estimated_monotonic_time_of_the_unix_epoch()
{
(void)global;
// To get time origin timestamp, given a global object global, run the following steps, which return a duration:
// FIXME: 1. Let timeOrigin be global's relevant settings object's time origin.
auto time_origin = 0;
// Each group of environment settings objects that could possibly communicate in any way
// has an estimated monotonic time of the Unix epoch, a moment on the monotonic clock,
// whose value is initialized by the following steps:
// !. Let wall time be the wall clock's unsafe current time.
struct timeval tv;
gettimeofday(&tv, nullptr);
auto wall_time = tv.tv_sec * 1000.0 + tv.tv_usec / 1000.0;
// 1. Let wall time be the wall clock's unsafe current time.
auto wall_time = wall_clock_unsafe_current_time();
// 2. Let monotonic time be the monotonic clock's unsafe current time.
auto monotonic_time = unsafe_shared_current_time();
@@ -37,9 +29,18 @@ DOMHighResTimeStamp get_time_origin_timestamp(JS::Object const& global)
// 4. Initialize the estimated monotonic time of the Unix epoch to the result of calling coarsen time with epoch time
auto estimated_monotonic_time = coarsen_time(epoch_time);
return estimated_monotonic_time;
}
// https://w3c.github.io/hr-time/#dfn-get-time-origin-timestamp
DOMHighResTimeStamp get_time_origin_timestamp(JS::Object const& global)
{
// To get time origin timestamp, given a global object global, run the following steps, which return a duration:
// 1. Let timeOrigin be global's relevant settings object's time origin.
auto time_origin = HTML::relevant_principal_settings_object(global).time_origin();
// 2. Return the duration from the estimated monotonic time of the Unix epoch to timeOrigin.
return estimated_monotonic_time - time_origin;
return time_origin - estimated_monotonic_time_of_the_unix_epoch();
}
// https://w3c.github.io/hr-time/#dfn-coarsen-time
@@ -75,8 +76,9 @@ DOMHighResTimeStamp relative_high_resolution_time(DOMHighResTimeStamp time, JS::
// https://w3c.github.io/hr-time/#dfn-relative-high-resolution-coarse-time
DOMHighResTimeStamp relative_high_resolution_coarsen_time(DOMHighResTimeStamp coarsen_time, JS::Object const& global)
{
// The relative high resolution coarse time given a DOMHighResTimeStamp coarseTime and a global object global, is the difference between coarseTime and the result of calling get time origin timestamp with global.
return coarsen_time - get_time_origin_timestamp(global);
// The relative high resolution coarse time given a moment from the monotonic clock coarseTime and a global object global, is the duration from global's relevant settings object's time origin to coarseTime.
auto time_origin = HTML::relevant_principal_settings_object(global).time_origin();
return coarsen_time - time_origin;
}
// https://w3c.github.io/hr-time/#dfn-coarsened-shared-current-time
@@ -86,6 +88,12 @@ DOMHighResTimeStamp coarsened_shared_current_time(bool cross_origin_isolated_cap
return coarsen_time(unsafe_shared_current_time(), cross_origin_isolated_capability);
}
// https://w3c.github.io/hr-time/#wall-clock-unsafe-current-time
DOMHighResTimeStamp wall_clock_unsafe_current_time()
{
return UnixDateTime::now().nanoseconds_since_epoch() / 1.0e6;
}
// https://w3c.github.io/hr-time/#dfn-unsafe-shared-current-time
DOMHighResTimeStamp unsafe_shared_current_time()
{