Virtual static interface methods analyzis API

[syrompetka]

I'm trying to analyze following code:

namespace ConsoleApp5
{
    internal class Program
    {
        static void DoWrapper<T>() where T : IStaticVirtual => T.Do();

        static void Main()
        {
            DoWrapper<StaticVirtualImplementation>();
        }


        private interface IStaticVirtual
        {
            public static virtual void Do() => Console.WriteLine(nameof(IStaticVirtual));
        }

        private class StaticVirtualBase : IStaticVirtual
        {
            public static void Do() => Console.WriteLine(nameof(StaticVirtualBase));
        }

        private class StaticVirtualImplementation : StaticVirtualBase { }
    }
}

How can I identify which implementation of virtual static method will be invoked from Main?

Looks like there was no API added to do that when feature was implemented.

[CyrusNajmabadi]

How can I identify which implementation of virtual static method will be invoked from Main?

From inside Main you can use the semantic model to ask about DoWrapper<StaticVirtualImplementation>(); It will tell you that you are invoking the DoWrapper<T> method where T is StaticVirtualImplementation. See .ConstructedFrom on the DoWrapper<StaticVirtualImplementation> method symbol you get to get bacck to the DoWrapper<T> method.

Now that you have this information, you can analyze DoWrapper<>. Inside of that you will see that .Do is a call to IStaticVirtual.Do through T. Knowing that T is the ITypeSymbol StaticVirtualImplementation you can use FindImplementationForInterfaceMember on it with the interface member IStaticVirtual.Do to get back StaticVirtualBase.Do.

[CyrusNajmabadi]

Looks like there was no API added to do that when feature was implemented.

The existing Semantic, IOperation and Symbol models should be sufficient to figure this out :)

[CyrusNajmabadi]

I also recommend our discord channel (https://discord.com/invite/tGJvv88, #roslyn) for questions like this.