dart-lang / native / 8527392497

90%

push

github

Enable sharing `JObject`s across isolates (#1060)

We use a `FinalizableHandle` which is for an entire isolate group as opposed to a `NativeFinalizer` which belongs to a single isolate. This way we can use `@pragma('vm:deeply-immutable')` on `JReference` to share the reference object between multiple isolates while the finalizable handle takes care of the global reference deletion.

The guarantees we provide:
* use-after-free will throw from Dart
* use-on-isolate-b-after-free-on-isolate-a will throw from Dart
* double-free will throw from Dart
* free-on-isolate-b-after-free-on-isolate-a will throw from Dart

In general, if we're not eagerly freeing via `.release()`, things work.

44 of 49 new or added lines in 3 files covered. (89.8%)

8836 of 9604 relevant lines covered (92.0%)

17.64 hits per line