[release/9.0-staging] Fix obtaining type handles of IDynamicInterfaceCastableImplementation #109909
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Fixes #109496. We try to optimize away type handles (MethodTables) of types that are only needed due to metadata. Trying to grab type handle of such type throws. This fixes it by unconditionally generating type handles of IDynamicInterfaceCastableImplementation.
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Tagging subscribers to this area: @agocke, @MichalStrehovsky, @jkotas |
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Backport of #109875 to release/9.0-staging
/cc @MichalStrehovsky
Customer Impact
Hit by a 1st party in #109496. Users using CsWinRT might run into an issue where the compiler optimized away a part of a type that is necessary for execution.
Regression
Not a regression, this was broken since 7.0, but nobody was building WinUI apps with native AOT because CsWinRT didn't support it.
Testing
This requires a bit of bad luck to hit. The compiler will only optimize this away if the only thing that references the type in the entire app is a custom attribute. We now have a targeted test for this situation.
Risk
Low risk, this just suppresses an optimization.
IMPORTANT: If this backport is for a servicing release, please verify that:
The PR target branch is
release/X.0-staging, notrelease/X.0.If the change touches code that ships in a NuGet package, you have added the necessary package authoring and gotten it explicitly reviewed.