1347437 - Promises should be run when JS stack is exhausted

Status: NEW

(Core :: DOM: Core & HTML, defect, P3)

Comment 1

[JW Wang [:jwwang] [:jw_wang]]

Attachment: Bug 1347437 - test case.

Review commit: https://reviewboard.mozilla.org/r/120414/diff/#index_header
See other reviews: https://reviewboard.mozilla.org/r/120414/

Comment 2

[JW Wang [:jwwang] [:jw_wang]]

repro steps:
1. apply the patch
2. build
3. ./mach run dom/media/test/test_events.html

expected event sequence:
got preloadedmetadata event.
Promise resolved.
got loadedmetadata event.

actual event sequence:
got preloadedmetadata event.
got loadedmetadata event.
Promise resolved.

Micro tasks should be run between |r1->Run()| and |r2->Run()|.

Comment 3

[Olli Pettay [:smaug][[e-mail]]]

The .cpp code is very odd.
Microtasks should not run between those runs, _if_ there are no event listener which get called.
If event listeners are called
, then microtasks are called when outermost script execution ends, so usually at the end of each event listener.
Our Promises don't use microtasks. I'm still fixing that.

I guess this bug is about Promises, not microtasks.