[release/8.0] Fix runtime dispatch to static virtuals on interface types #91440
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We were not generating information about static virtuals on interface types. Information about default interface methods normally goes to the class, but if the T we're dispatching on is an interface, this information wasn't generated. The fix is to put this information into dispatch maps and sealed vtables, same way we do for classes. The test shows what the problem is - if we change `IBar` to be a class, things would work even before this PR.
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Tagging subscribers to this area: @agocke, @MichalStrehovsky, @jkotas Issue DetailsBackport of #91374 to release/8.0 Customer ImpactTestingRiskIMPORTANT: If this backport is for a servicing release, please verify that:
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jkotas
approved these changes
Sep 1, 2023
jeffschwMSFT
approved these changes
Sep 1, 2023
ghost
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Backport of #91374 to release/8.0
/cc @MichalStrehovsky
Customer Impact
This was a customer reported issue at #90333.
It's not possible to resolve certain static virtual interface dispatches at runtime.
Most static virtual interface dispatches get resolved at compile time. But for some forms of dynamic code, we need to be able to compute this at runtime. Logic was missing to do that on interfaces.
Testing
All Native AOT testing, plus targeted tests, plus customer repro.
Risk
Low. We have decent test coverage.
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.