[release/8.0-staging] [mono][interp] Resolve virtual method on delegates created by compiled code #101290
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…d code Creating a delegate would normally end up calling into the runtime via ves_icall_mono_delegate_ctor. However, jit/aot backand have a fastpath where the delegate is not fully initialized (relying on the delegate trampoline to resolve the actual method to be called when the delegate is first called). Interp delegate initialization therefore doesn't take place. If this is the case and the delegate method is virtual, we would need to resolve it based on the target object.
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@simonrozsival could you please fill in the PR description? |
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@vitek-karas the template was filled out and Vlad reviewed it. If this is ready, please send the email to Tactics requesting approval and add the |
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Backport of #101168 to release/8.0-staging
/cc @simonrozsival @BrzVlad
Customer Impact
This issue caused customer's MacCatalyst app to crash. Because of this issue, delegates are potentially broken when mixing aot and interpreted code. Delegates created in aot-code that contain a virtual method on a target object are not invoked properly in the interpreter because we don't resolve the virtual method on the object.
Regression
Testing
Manual testing. This change only affects calls from code that is compiled with Mono AOT and code that is using the Mono Interpreter. This is a configuration that is sometimes used in iOS and Mac Catalyst apps and it is hard to test with automated tests. The fix was verified in the context of a Mac Catalyst repro app (#101074).
Risk
Low