Work towards shared generics support in IDynamicIntefaceCastable

src/coreclr/nativeaot/System.Private.CoreLib/src/Internal/Runtime/CompilerHelpers/SharedCodeHelpers.cs

@@ -15,5 +15,12 @@ internal static class SharedCodeHelpers
             Debug.Assert(interfaceIndex <= pType->NumInterfaces);
             return pType->InterfaceMap[interfaceIndex].InterfaceType;
         }
+
+        public static unsafe MethodTable* GetCurrentSharedThunkContext()
+        {
+            // TODO: We should return the current context from the ThunkPool
+            // https://github.com/dotnet/runtimelab/issues/1442
+            return null;
+        }
     }
 }

src/coreclr/tools/Common/TypeSystem/Common/MetadataVirtualMethodAlgorithm.cs

@@ -752,7 +752,7 @@ private static DefaultInterfaceMethodResolution ResolveInterfaceMethodToDefaultI
                 // If we're asking about an interface, include the interface in the list.
                 consideredInterfaces = new DefType[currentType.RuntimeInterfaces.Length + 1];
                 Array.Copy(currentType.RuntimeInterfaces, consideredInterfaces, currentType.RuntimeInterfaces.Length);
-                consideredInterfaces[consideredInterfaces.Length - 1] = currentType;
+                consideredInterfaces[consideredInterfaces.Length - 1] = (DefType)currentType.InstantiateAsOpen();
             }
 
             foreach (MetadataType runtimeInterface in consideredInterfaces)

src/coreclr/tools/aot/ILCompiler.Compiler/Compiler/CompilerTypeSystemContext.IntefaceThunks.cs

@@ -64,6 +64,8 @@ namespace ILCompiler
     // Contains functionality related to instantiating thunks for default interface methods
     partial class CompilerTypeSystemContext
     {
+        private const int UseContextFromRuntime = -1;
+
         /// <summary>
         /// For a shared (canonical) default interface method, gets a method that can be used to call the
         /// method on a specific implementing class.
@@ -76,8 +78,17 @@ public MethodDesc GetDefaultInterfaceMethodImplementationThunk(MethodDesc target
             Debug.Assert(interfaceOnDefinition.GetTypeDefinition() == targetMethod.OwningType.GetTypeDefinition());
             Debug.Assert(targetMethod.OwningType.IsInterface);
 
-            int interfaceIndex = Array.IndexOf(implementingClass.GetTypeDefinition().RuntimeInterfaces, interfaceOnDefinition);
-            Debug.Assert(interfaceIndex >= 0);
+            int interfaceIndex;
+            if (implementingClass.IsInterface)
+            {
+                Debug.Assert(((MetadataType)implementingClass).IsDynamicInterfaceCastableImplementation());
+                interfaceIndex = UseContextFromRuntime;
+            }
+            else
+            {
+                interfaceIndex = Array.IndexOf(implementingClass.GetTypeDefinition().RuntimeInterfaces, interfaceOnDefinition);
+                Debug.Assert(interfaceIndex >= 0);
+            }
 
             // Get a method that will inject the appropriate instantiation context to the
             // target default interface method.
@@ -197,15 +208,23 @@ public override MethodIL EmitIL()
 
                 FieldDesc eeTypeField = Context.GetWellKnownType(WellKnownType.Object).GetKnownField("m_pEEType");
                 MethodDesc getOrdinalInterfaceMethod = Context.GetHelperEntryPoint("SharedCodeHelpers", "GetOrdinalInterface");
+                MethodDesc getCurrentContext = Context.GetHelperEntryPoint("SharedCodeHelpers", "GetCurrentSharedThunkContext");
 
                 // Load "this"
                 codeStream.EmitLdArg(0);
 
                 // Load the instantiating argument.
-                codeStream.EmitLdArg(0);
-                codeStream.Emit(ILOpcode.ldfld, emit.NewToken(eeTypeField));
-                codeStream.EmitLdc(_interfaceIndex);
-                codeStream.Emit(ILOpcode.call, emit.NewToken(getOrdinalInterfaceMethod));
+                if (_interfaceIndex == UseContextFromRuntime)
+                {
+                    codeStream.Emit(ILOpcode.call, emit.NewToken(getCurrentContext));
+                }
+                else
+                {
+                    codeStream.EmitLdArg(0);
+                    codeStream.Emit(ILOpcode.ldfld, emit.NewToken(eeTypeField));
+                    codeStream.EmitLdc(_interfaceIndex);
+                    codeStream.Emit(ILOpcode.call, emit.NewToken(getOrdinalInterfaceMethod));
+                }
 
                 // Load rest of the arguments
                 for (int i = 0; i < _targetMethod.Signature.Length; i++)

src/coreclr/tools/aot/ILCompiler.Compiler/Compiler/DependencyAnalysis/EETypeNode.cs

@@ -422,8 +422,7 @@ public sealed override IEnumerable<CombinedDependencyListEntry> GetConditionalSt
                             if (resolution == DefaultInterfaceMethodResolution.DefaultImplementation)
                             {
                                 DefType providingInterfaceDefinitionType = (DefType)implMethod.OwningType;
-                                if (!interfaceType.IsTypeDefinition)
-                                    implMethod = implMethod.InstantiateSignature(defType.Instantiation, Instantiation.Empty);
+                                implMethod = implMethod.InstantiateSignature(defType.Instantiation, Instantiation.Empty);
 
                                 MethodDesc defaultIntfMethod = implMethod.GetCanonMethodTarget(CanonicalFormKind.Specific);
                                 if (defaultIntfMethod.IsCanonicalMethod(CanonicalFormKind.Any))

src/coreclr/tools/aot/ILCompiler.Compiler/Compiler/DependencyAnalysis/InterfaceDispatchMapNode.cs

@@ -195,9 +195,7 @@ void EmitDispatchMap(ref ObjectDataBuilder builder, NodeFactory factory)
                         if (result == DefaultInterfaceMethodResolution.DefaultImplementation)
                         {
                             DefType providingInterfaceDefinitionType = (DefType)implMethod.OwningType;
-                            if (interfaceType != interfaceDefinitionType)
-                                implMethod = implMethod.InstantiateSignature(declType.Instantiation, Instantiation.Empty);
-
+                            implMethod = implMethod.InstantiateSignature(declType.Instantiation, Instantiation.Empty);
                             implSlot = VirtualMethodSlotHelper.GetDefaultInterfaceMethodSlot(factory, implMethod, declType, providingInterfaceDefinitionType);
                         }
                         else if (result == DefaultInterfaceMethodResolution.Reabstraction)

src/coreclr/tools/aot/ILCompiler.Compiler/Compiler/DependencyAnalysis/SealedVTableNode.cs

@@ -174,9 +174,7 @@ public bool BuildSealedVTableSlots(NodeFactory factory, bool relocsOnly)
                         if (resolution == DefaultInterfaceMethodResolution.DefaultImplementation)
                         {
                             DefType providingInterfaceDefinitionType = (DefType)implMethod.OwningType;
-                            if (interfaceType != interfaceDefinitionType)
-                                implMethod = implMethod.InstantiateSignature(declType.Instantiation, Instantiation.Empty);
-
+                            implMethod = implMethod.InstantiateSignature(declType.Instantiation, Instantiation.Empty);
                             _sealedVTableEntries.Add(SealedVTableEntry.FromDefaultInterfaceMethod(implMethod, providingInterfaceDefinitionType));
                         }
                     }

src/tests/issues.targets

@@ -1022,9 +1022,6 @@
         <ExcludeList Include="$(XunitTestBinBase)/Interop/ICustomMarshaler/Primitives/ICustomMarshaler_TargetWindows/*">
             <Issue>https://github.com/dotnet/runtimelab/issues/160</Issue>
         </ExcludeList>
-        <ExcludeList Include="$(XunitTestBinBase)/Interop/IDynamicInterfaceCastable/IDynamicInterfaceCastable/*">
-            <Issue>https://github.com/dotnet/runtimelab/issues/162</Issue>
-        </ExcludeList>
         <ExcludeList Include="$(XunitTestBinBase)/Interop/IJW/**/*">
             <Issue>https://github.com/dotnet/runtimelab/issues/155: C++/CLI</Issue>
         </ExcludeList>

src/tests/nativeaot/SmokeTests/Interfaces/Interfaces.cs

@@ -756,6 +756,12 @@ interface IInterfaceCastableImpl : IInterface
             string IInterface.GetCookie() => "IInterfaceCastableImpl";
         }
 
+        [DynamicInterfaceCastableImplementation]
+        interface IInterfaceCastableImpl<T> : IInterface
+        {
+            string IInterface.GetCookie() => typeof(T).Name;
+        }
+
         interface IInterfaceImpl : IInterface
         {
             string IInterface.GetCookie() => "IInterfaceImpl";
@@ -794,6 +800,12 @@ public static void Run()
                 if (o.GetCookie() != "IInterfaceImpl")
                     throw new Exception();
             }
+
+            {
+                IInterface o = (IInterface)new CastableClass<IInterface, IInterfaceCastableImpl<int>>();
+                if (o.GetCookie() != "Int32")
+                    throw new Exception();
+            }
         }
     }
 }