Fix virtual static dispatch for variant interfaces when using default implementations #88639
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…ike variant interface default method dispatch
…plementationException
| if (!canonicalEquivalentFound) | ||
| { | ||
| // Search for match on a per-level in the type hierarchy | ||
| for (MethodTable* pMT = this; pMT != nullptr; pMT = pMT->GetParentMethodTable()) |
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Shouldn't this parent type descent also be in a 2-pass loop over allowVariance = FALSE, TRUE when allowVariantMatches is set i.o.w. shouldn't it also be in the below loop used for default interface resolution?
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Hmm, after getting my head around the tests I take it back, the variant lookup should take place before descending into parent.
| // Variant or equivalent matching interface found | ||
| // Attempt to resolve on variance matched interface | ||
| pMD = pMT->TryResolveVirtualStaticMethodOnThisType(pItfInMap, pInterfaceMD, verifyImplemented, level); | ||
| pMD = pMT->TryResolveVirtualStaticMethodOnThisType(pItfInMap, pInterfaceMD, verifyImplemented, /*allowVariance*/ FALSE, level); |
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Shouldn't we be setting allowVariance to TRUE (or perhaps to allowVariantMatches) here? Otherwise I don't see where we are supposed to be performing the variant resolution in this method; can you please explain to me what am I missing?
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Alternatively, if it's the case that in practice all variant resolution is only limited to the default interface implementation case (which is probably correct), why do we need this additional pass over the interface map in this place?
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@davidwrighton I didn't see the new test run with Mono - I think there might be some issue with the pipeline triggers when only a test changed. Could you touch some file in |
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Fixes #78621