Commit graph

4 commits

Author SHA1 Message Date
Andreas Kling
e0493c509e LibJS: Make the forward transition chain weakly cached
Before this patch, every shape would permanently remember every other
shape it had ever transitioned to. This could lead to pathological
accumulation of unused shape objects in some cases.

Fix this by using WeakPtr instead of a strongly visited Shape* in the
the forward transition chain map. This means that we will now miss out
on some shape sharing opportunities, but since this is not required
for correctness it doesn't matter.

Note that the backward transition chain is still strongly cached,
as it's necessary for the reification of property tables.

An interesting future optimization could be to allow property tables
to get garbage collected (by detaching them from the shape object)
and then reconstituted from the backwards transition chain (if needed.)
2021-05-17 21:40:18 +02:00
Andreas Kling
6714cf3631 LibJS: Move Cell.{cpp,h} from Runtime/ to Heap/ 2021-05-17 19:53:00 +02:00
Brian Gianforcaro
1682f0b760 Everything: Move to SPDX license identifiers in all files.
SPDX License Identifiers are a more compact / standardized
way of representing file license information.

See: https://spdx.dev/resources/use/#identifiers

This was done with the `ambr` search and replace tool.

 ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
2021-04-22 11:22:27 +02:00
Andreas Kling
13d7c09125 Libraries: Move to Userland/Libraries/ 2021-01-12 12:17:46 +01:00
Renamed from Libraries/LibJS/Runtime/Shape.h (Browse further)