[release/8.0-staging] [mono] [imt] Don't increment vt_slot for non-virtual generic methods #94469
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Nov 7, 2023
Interfaces can have static generic methods, for example. They don't have a vt_slot. When building an IMT slot, we need to collect all the interface methods that map to a particular IMT slot along with their implementing vtable entries. To do that, vt_slot starts at the interface offset of a particular interface and keeps incrementing as we iterate over the methods of the interface. It is crtitical that vt_slot is accurate - otherwise we may dispatch the interface call to the wrong virtual method.
the extra_interfaces argument was used to implement additional interfaces on cross-domain transparent proxy objects.
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This was referenced Nov 7, 2023
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Backport of #94437 to release/8.0-staging
/cc @lambdageek
Customer Impact
Customers using code that includes rich inheritance hierarchies of interfaces along with static methods in interfaces are able to call interface methods correctly.
Customers utilizing EF Core 8.0 on mobile and WebAssembly platforms are able to run their apps without crashing.
Testing
CI and manual testing
Risk
Low
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.