Ömer Ağacan
14fd3cd1fe
This is another attempt at fixing #62319. See https://dart-review.googlesource.com/c/sdk/+/470100 for the previous attempt. Add new member `bool get isCyclic` to `ClassInfo`: returns whether the class has non-nullable reference cycles. If a class has a cycle via non-nullable references, then it cannot be dummy, because the values will need to have a cycle, but the type won't allow late binding (as the references that form the cycle are non-nullable). In these cases create the locals of these types as `ref null #Top` and use `ref.null` as the dummy values. Generate `unreachable` in the members of un-instantiable classes, as they can't be called. Fixes #62319. Issue: https://github.com/dart-lang/sdk/issues/62319 Change-Id: Iefa1949f0175eb4757fd7cfae3b25a87d17f3e8d Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/471201 Reviewed-by: Martin Kustermann <kustermann@google.com> Commit-Queue: Ömer Ağacan <omersa@google.com>