[Temporal] Implement `with` method for PlainMonthDay #52251

catamorphism · 2025-10-13T18:29:20Z

`f37c4da`

[Temporal] Implement `with` method for PlainMonthDay

https://bugs.webkit.org/show_bug.cgi?id=300640

Reviewed by Yusuke Suzuki.

with() calls TemporalCalendar::monthDayFromFields(), which calls
TemporalCalendar::isoDateFromFields() -- hence the changes to the type
signature of isoDateFromFields(), which also change the type signatures
of various from() methods.

* JSTests/stress/temporal-plainmonthday.js:
(shouldBe):
* JSTests/test262/config.yaml:
* JSTests/test262/expectations.yaml:
* Source/JavaScriptCore/runtime/ISO8601.cpp:
(JSC::ISO8601::parseMonthCode):
(JSC::ISO8601::validMonthCode):
(JSC::ISO8601::monthFromCode): Deleted.
* Source/JavaScriptCore/runtime/ISO8601.h:
* Source/JavaScriptCore/runtime/TemporalCalendar.cpp:
(JSC::calendarResolveFields):
(JSC::TemporalCalendar::isoDateFromFields):
(JSC::TemporalCalendar::monthDayFromFields):
* Source/JavaScriptCore/runtime/TemporalCalendar.h:
* Source/JavaScriptCore/runtime/TemporalCalendarPrototype.cpp:
(JSC::JSC_DEFINE_HOST_FUNCTION):
* Source/JavaScriptCore/runtime/TemporalDuration.cpp:
(JSC::getEpochNanosecondsFor):
* Source/JavaScriptCore/runtime/TemporalDuration.h:
* Source/JavaScriptCore/runtime/TemporalObject.cpp:
(JSC::getMonthCode):
* Source/JavaScriptCore/runtime/TemporalObject.h:
* Source/JavaScriptCore/runtime/TemporalPlainDate.cpp:
(JSC::TemporalPlainDate::from):
(JSC::TemporalPlainDate::toPartialDate):
(JSC::TemporalPlainDate::with):
* Source/JavaScriptCore/runtime/TemporalPlainDate.h:
* Source/JavaScriptCore/runtime/TemporalPlainDateConstructor.cpp:
(JSC::JSC_DEFINE_HOST_FUNCTION):
* Source/JavaScriptCore/runtime/TemporalPlainDatePrototype.cpp:
(JSC::JSC_DEFINE_HOST_FUNCTION):
* Source/JavaScriptCore/runtime/TemporalPlainDateTime.cpp:
(JSC::TemporalPlainDateTime::from):
(JSC::TemporalPlainDateTime::with):
* Source/JavaScriptCore/runtime/TemporalPlainDateTime.h:
* Source/JavaScriptCore/runtime/TemporalPlainDateTimeConstructor.cpp:
(JSC::JSC_DEFINE_HOST_FUNCTION):
* Source/JavaScriptCore/runtime/TemporalPlainMonthDay.cpp:
(JSC::TemporalPlainMonthDay::with):
* Source/JavaScriptCore/runtime/TemporalPlainMonthDay.h:
* Source/JavaScriptCore/runtime/TemporalPlainMonthDayConstructor.cpp:
(JSC::JSC_DEFINE_HOST_FUNCTION):
* Source/JavaScriptCore/runtime/TemporalPlainMonthDayPrototype.cpp:
(JSC::JSC_DEFINE_HOST_FUNCTION):
(JSC::JSC_DEFINE_CUSTOM_GETTER):

Canonical link: https://commits.webkit.org/303360@main

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webkit-early-warning-system · 2025-10-13T18:29:28Z

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✅ 🧪 webkitperl	⏳ 🧪 ios-wk2	✅ 🧪 api-mac	⏳ 🧪 api-wpe
	⏳ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	⏳ 🛠 wpe-cairo
✅ 🛠 🧪 jsc	⏳ 🧪 api-ios	✅ 🧪 mac-wk2	⏳ 🛠 gtk
✅ 🛠 🧪 jsc-arm64	⏳ 🛠 vision	~~🧪 mac-AS-debug-wk2~~	⏳ 🧪 gtk-wk2
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	⏳ 🧪 api-gtk
	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2	⏳ 🛠 playstation
	⏳ 🛠 tv	✅ 🛠 mac-safer-cpp	✅ 🛠 jsc-armv7
	⏳ 🛠 tv-sim		~~🧪 jsc-armv7-tests~~
	⏳ 🛠 watch
	⏳ 🛠 watch-sim

Source/JavaScriptCore/runtime/ISO8601.cpp

Source/JavaScriptCore/runtime/ISO8601.h

Source/JavaScriptCore/runtime/TemporalCalendar.cpp

Source/JavaScriptCore/runtime/TemporalObject.cpp

webkit-early-warning-system · 2025-10-13T19:25:31Z

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✅ 🛠 🧪 jsc-arm64	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
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	✅ 🛠 watch
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Constellation

Overall, I'm very concerning about these double year / month / day.
It is very inefficient.
Can you provide what part of the spec makes it double instead of using integers?

catamorphism · 2025-10-14T18:42:36Z

Overall, I'm very concerning about these double year / month / day. It is very inefficient. Can you provide what part of the spec makes it double instead of using integers?

@Constellation In the spec, Calendar Fields Records ( https://tc39.es/proposal-temporal/#sec-temporal-calendar-fields-records ) have integer fields; these are mathematical integers and not 32-bit integers.

In the code, isoDateFromFields (the overload that takes a JSObject* as the second argument) gets the year, month and day values directly from the JSObject, by calling toIntegerOrInfinity(), which returns a double. These double values are eventually converted to either int32_t or unsigned when the PlainDate (or PlainMonthDay, etc.) constructor is called, but I don't see a drawback to re-using these values so we can follow the spec in terms of exactly when validation is performed. No calculations are done on these double values; they're just passed around.

I can move the validation earlier if absolutely necessary, so that the doubles returned by toIntegerOrInfinity() are converted earlier, but I'm concerned about potential code duplication, potentially breaking tests that rely on checks being performed in a particular order, and departing (further) from the spec.

webkit-early-warning-system · 2025-10-18T21:09:30Z

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❌ 🛠 🧪 jsc	❌ 🧪 api-ios	❌ 🧪 mac-wk2	❌ 🛠 gtk
❌ 🛠 🧪 jsc-arm64	❌ 🛠 vision	❌ 🧪 mac-AS-debug-wk2	❌ 🧪 gtk-wk2
	❌ 🛠 vision-sim	❌ 🧪 mac-wk2-stress	❌ 🧪 api-gtk
	⏳ 🧪 vision-wk2	❌ 🧪 mac-intel-wk2	⏳ 🛠 playstation
	❌ 🛠 tv	❌ 🛠 mac-safer-cpp	❌ 🛠 jsc-armv7
	❌ 🛠 tv-sim		❌ 🧪 jsc-armv7-tests
	❌ 🛠 watch
	❌ 🛠 watch-sim

catamorphism · 2025-10-18T21:11:01Z

@Constellation In 68c64c7 I changed the functions in questions to take int32_t / unsigned instead of double for year/month/day values. There's some code duplication, but not as much as I had thought there would be. Please take a look when you get a chance.

webkit-early-warning-system · 2025-10-18T21:51:24Z

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✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 wpe-cairo
✅ 🛠 🧪 jsc	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
✅ 🛠 🧪 jsc-arm64	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2	~~🛠 playstation~~
	✅ 🛠 tv	✅ 🛠 mac-safer-cpp	✅ 🛠 jsc-armv7
	✅ 🛠 tv-sim		✅ 🧪 jsc-armv7-tests
	✅ 🛠 watch
	✅ 🛠 watch-sim

Constellation

Commented. Please check all error cases are annotated as [[unlikely]] and checking whether there is missing error cases.

Source/JavaScriptCore/runtime/TemporalCalendar.cpp

Source/JavaScriptCore/runtime/TemporalPlainMonthDay.cpp

Source/JavaScriptCore/runtime/TemporalPlainMonthDayPrototype.cpp

Source/JavaScriptCore/runtime/TemporalPlainDate.cpp

Source/JavaScriptCore/runtime/TemporalCalendar.cpp

webkit-early-warning-system · 2025-10-27T17:14:28Z

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	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	~~🧪 wpe-wk2~~	~~🧪 win-tests~~
✅ 🧪 webkitperl	~~🧪 ios-wk2~~	~~🧪 api-mac~~	~~🧪 api-wpe~~
	~~🧪 ios-wk2-wpt~~	~~🧪 mac-wk1~~	⏳ 🛠 wpe-cairo
~~🛠 🧪 jsc~~	~~🧪 api-ios~~	~~🧪 mac-wk2~~	⏳ 🛠 gtk
✅ 🛠 🧪 jsc-arm64	✅ 🛠 vision	~~🧪 mac-AS-debug-wk2~~	⏳ 🧪 gtk-wk2
	✅ 🛠 vision-sim	~~🧪 mac-wk2-stress~~	⏳ 🧪 api-gtk
	~~🧪 vision-wk2~~	~~🧪 mac-intel-wk2~~	~~🛠 playstation~~
	✅ 🛠 tv	✅ 🛠 mac-safer-cpp	✅ 🛠 jsc-armv7
	✅ 🛠 tv-sim		~~🧪 jsc-armv7-tests~~
	⏳ 🛠 watch
	⏳ 🛠 watch-sim

webkit-early-warning-system · 2025-10-27T17:17:51Z

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	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	❌ 🧪 win-tests
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 wpe-cairo
✅ 🛠 🧪 jsc	❌ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
✅ 🛠 🧪 jsc-arm64	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2	~~🛠 playstation~~
	✅ 🛠 tv	✅ 🛠 mac-safer-cpp	✅ 🛠 jsc-armv7
	✅ 🛠 tv-sim		✅ 🧪 jsc-armv7-tests
	✅ 🛠 watch
	✅ 🛠 watch-sim

webkit-early-warning-system · 2025-11-14T01:49:50Z

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	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	✅ 🧪 win-tests
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe
	✅ 🧪 ios-wk2-wpt	⏳ 🧪 api-mac-debug	✅ 🛠 wpe-cairo
✅ 🛠 🧪 jsc	✅ 🧪 api-ios	❌ 🧪 mac-wk1	✅ 🛠 gtk
✅ 🛠 🧪 jsc-arm64	✅ 🛠 vision	✅ 🧪 mac-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision-sim	❌ 🧪 mac-AS-debug-wk2	✅ 🧪 api-gtk
	✅ 🧪 vision-wk2	✅ 🧪 mac-wk2-stress	~~🛠 playstation~~
	✅ 🛠 tv	✅ 🧪 mac-intel-wk2	✅ 🛠 jsc-armv7
	✅ 🛠 tv-sim	✅ 🛠 mac-safer-cpp	✅ 🧪 jsc-armv7-tests
	✅ 🛠 watch
	✅ 🛠 watch-sim

webkit-early-warning-system · 2025-11-20T20:17:32Z

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	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	~~🧪 win-tests~~
✅ 🧪 webkitperl	~~🧪 ios-wk2~~	✅ 🧪 api-mac	✅ 🧪 api-wpe
	~~🧪 ios-wk2-wpt~~	~~🧪 api-mac-debug~~	✅ 🛠 wpe-cairo
✅ 🛠 🧪 jsc	✅ 🧪 api-ios	✅ 🧪 mac-wk1	✅ 🛠 gtk
✅ 🛠 🧪 jsc-arm64	✅ 🛠 vision	✅ 🧪 mac-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision-sim	~~🧪 mac-AS-debug-wk2~~	✅ 🧪 api-gtk
✅ 🛠 🧪 merge	✅ 🧪 vision-wk2	✅ 🧪 mac-wk2-stress	~~🛠 playstation~~
	✅ 🛠 tv	✅ 🧪 mac-intel-wk2	✅ 🛠 jsc-armv7
	✅ 🛠 tv-sim	✅ 🛠 mac-safer-cpp	✅ 🧪 jsc-armv7-tests
	✅ 🛠 watch
	✅ 🛠 watch-sim

catamorphism · 2025-11-20T20:17:59Z

Squashed and rebased.

https://bugs.webkit.org/show_bug.cgi?id=300640 Reviewed by Yusuke Suzuki. with() calls TemporalCalendar::monthDayFromFields(), which calls TemporalCalendar::isoDateFromFields() -- hence the changes to the type signature of isoDateFromFields(), which also change the type signatures of various from() methods. * JSTests/stress/temporal-plainmonthday.js: (shouldBe): * JSTests/test262/config.yaml: * JSTests/test262/expectations.yaml: * Source/JavaScriptCore/runtime/ISO8601.cpp: (JSC::ISO8601::parseMonthCode): (JSC::ISO8601::validMonthCode): (JSC::ISO8601::monthFromCode): Deleted. * Source/JavaScriptCore/runtime/ISO8601.h: * Source/JavaScriptCore/runtime/TemporalCalendar.cpp: (JSC::calendarResolveFields): (JSC::TemporalCalendar::isoDateFromFields): (JSC::TemporalCalendar::monthDayFromFields): * Source/JavaScriptCore/runtime/TemporalCalendar.h: * Source/JavaScriptCore/runtime/TemporalCalendarPrototype.cpp: (JSC::JSC_DEFINE_HOST_FUNCTION): * Source/JavaScriptCore/runtime/TemporalDuration.cpp: (JSC::getEpochNanosecondsFor): * Source/JavaScriptCore/runtime/TemporalDuration.h: * Source/JavaScriptCore/runtime/TemporalObject.cpp: (JSC::getMonthCode): * Source/JavaScriptCore/runtime/TemporalObject.h: * Source/JavaScriptCore/runtime/TemporalPlainDate.cpp: (JSC::TemporalPlainDate::from): (JSC::TemporalPlainDate::toPartialDate): (JSC::TemporalPlainDate::with): * Source/JavaScriptCore/runtime/TemporalPlainDate.h: * Source/JavaScriptCore/runtime/TemporalPlainDateConstructor.cpp: (JSC::JSC_DEFINE_HOST_FUNCTION): * Source/JavaScriptCore/runtime/TemporalPlainDatePrototype.cpp: (JSC::JSC_DEFINE_HOST_FUNCTION): * Source/JavaScriptCore/runtime/TemporalPlainDateTime.cpp: (JSC::TemporalPlainDateTime::from): (JSC::TemporalPlainDateTime::with): * Source/JavaScriptCore/runtime/TemporalPlainDateTime.h: * Source/JavaScriptCore/runtime/TemporalPlainDateTimeConstructor.cpp: (JSC::JSC_DEFINE_HOST_FUNCTION): * Source/JavaScriptCore/runtime/TemporalPlainMonthDay.cpp: (JSC::TemporalPlainMonthDay::with): * Source/JavaScriptCore/runtime/TemporalPlainMonthDay.h: * Source/JavaScriptCore/runtime/TemporalPlainMonthDayConstructor.cpp: (JSC::JSC_DEFINE_HOST_FUNCTION): * Source/JavaScriptCore/runtime/TemporalPlainMonthDayPrototype.cpp: (JSC::JSC_DEFINE_HOST_FUNCTION): (JSC::JSC_DEFINE_CUSTOM_GETTER): Canonical link: https://commits.webkit.org/303360@main

webkit-commit-queue · 2025-11-20T23:53:49Z

Committed 303360@main (f37c4da): https://commits.webkit.org/303360@main

Reviewed commits have been landed. Closing PR #52251 and removing active labels.

catamorphism requested a review from a team as a code owner October 13, 2025 18:29

catamorphism self-assigned this Oct 13, 2025

catamorphism added the JavaScriptCore For bugs in JavaScriptCore, the JS engine used by WebKit, other than kxmlcore issues. label Oct 13, 2025

Constellation requested changes Oct 13, 2025

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Constellation requested changes Oct 14, 2025

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webkit-ews-buildbot added the merging-blocked Applied to prevent a change from being merged label Oct 18, 2025

catamorphism force-pushed the plainmonthday-plainyearmonth-part-4 branch from 68c64c7 to 89e2078 Compare October 18, 2025 21:51

Constellation reviewed Oct 23, 2025

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catamorphism force-pushed the plainmonthday-plainyearmonth-part-4 branch from 3c4d9d5 to 88d508b Compare November 14, 2025 01:49

Constellation approved these changes Nov 20, 2025

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catamorphism force-pushed the plainmonthday-plainyearmonth-part-4 branch from 88d508b to dce8c5b Compare November 20, 2025 20:17

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webkit-commit-queue merged commit f37c4da into WebKit:main Nov 20, 2025

[Temporal] Implement with method for PlainMonthDay #52251

[Temporal] Implement with method for PlainMonthDay #52251

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[Temporal] Implement `with` method for PlainMonthDay #52251

[Temporal] Implement `with` method for PlainMonthDay #52251

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