1764796 - Use the store buffer to trace preserved nursery wrappers in minor GC

Status: RESOLVED FIXED

(Core :: XPCOM, task, P3)

Description

[Jon Coppeard (:jonco)]

Currently CycleCollectedJSRuntime maintains a list of preserved nursery wrappers to make sure these survive a minor GC. However it's simpler and more efficient to use the store buffer to do this.

Comment 1

[Jon Coppeard (:jonco)]

Attachment: Bug 1764796 - Use the store buffer to trace preserved nursery wrappers in a minor GC r?mccr8

HeapObjectPostWriteBarrier adds or removes a store buffer entry for a change in
the GC graph entry based on the second and third arguments which are the target
of the edge before and after the change.

This patch also removes the store buffer entry in
nsWrapperCache::ReleaseWrapper which didn't happen before. This should help
keep less garbage alive unnecessarily.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/2e65ce5913e3
Use the store buffer to trace preserved nursery wrappers in a minor GC r=mccr8

Comment 3

[Sandor Molnar[:smolnar]]

https://hg.mozilla.org/mozilla-central/rev/2e65ce5913e3