tree 0d48704e3fa721779da11960514cff4b398328ea
parent 90262cf840b98fa2f12fe753bbb36355897bf0d8
author Michael Lippautz <mlippautz@chromium.org> 1626269475 +0000
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> 1626269475 +0000

EventTargetData: Avoid inlining a GarbageCollected object

Use a combination of a mixin, private inheritance, and a separate
object to allocate to avoid the GC_PLUGIN_IGNORE.

In addition, having a proper mixin interface actually allows for the
EventTargetData reference to actually escape onto the stack or heap,
which would otherwise be hard to check and enforce.

The only trade off is that this approach minmally regressed tracing
performance of EventTargetDataMap because the GC has to lookup the
header of a mixin object.

Bug: 513199, 1229149
Change-Id: I304655f4805810c38304b49526fb01b6d2eb87d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3026825
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#901470}