Missing method override

Based on #84, it seems that we are not emitting the IL that encodes the overriding behavior of a method.

@vermorel I observed interface implementation are handled with current codebase and ILDASM shows .override keyword in generated assemblies. Relevant parts:

ILPack/src/AssemblyGenerator.Methods.cs

Lines 48 to 73 in 427f215

    
           // Explicit interface implementations need to be marked with method implementation 
        
           // (This is the equivalent of .Override in msil) 
        
           if (method.IsPrivate) 
        
           { 
        
               // Go through all the implemented interfaces and all their methods 
        
               // looking for methods that this method implements and mark accordingly. 
        
               // NB: This is not super efficient.  Should probably create a map somewhere 
        
               //     for faster lookup, but this will do for now. 
        
               var type = method.DeclaringType; 
        
               foreach (var itf in type.GetInterfaces()) 
        
               { 
        
                   var itfMap = type.GetInterfaceMap(itf); 
        
                   for (int i = 0; i < itfMap.TargetMethods.Length; i++) 
        
                   { 
        
                       var m = itfMap.TargetMethods[i]; 
        
                       if (m == method) 
        
                       { 
        
                           var itfImpl = itfMap.InterfaceMethods[i]; 
        
                           _metadata.Builder.AddMethodImplementation((TypeDefinitionHandle)_metadata.GetTypeHandle(method.DeclaringType), handle, _metadata.GetMethodHandle(itfImpl)); 
        
                       } 
        
                   } 
        
               } 
        
           }

Could you clarify if it's something different, please?

I put this in to get explicit interface method implementations working. I did a couple of quick tests with the C# compiler and abstract/virtual methods and didn't see the .override directive. I didn't test method overrides though as figured I'd get back to it at a later date.

@toptensoftware Yes, I confirm that .override is only generated for interface implementations. Abstract/virtual methods do not cause to generate .override.

Test cases for this in PR #90. I also checked the ildasm, and couldn't see C# compiler generating .overrides for any of these.

Excellent!

	// Explicit interface implementations need to be marked with method implementation
	// (This is the equivalent of .Override in msil)
	if (method.IsPrivate)
	{
	// Go through all the implemented interfaces and all their methods
	// looking for methods that this method implements and mark accordingly.

	// NB: This is not super efficient. Should probably create a map somewhere
	// for faster lookup, but this will do for now.

	var type = method.DeclaringType;
	foreach (var itf in type.GetInterfaces())
	{
	var itfMap = type.GetInterfaceMap(itf);
	for (int i = 0; i < itfMap.TargetMethods.Length; i++)
	{
	var m = itfMap.TargetMethods[i];
	if (m == method)
	{
	var itfImpl = itfMap.InterfaceMethods[i];
	_metadata.Builder.AddMethodImplementation((TypeDefinitionHandle)_metadata.GetTypeHandle(method.DeclaringType), handle, _metadata.GetMethodHandle(itfImpl));

	}
	}
	}
	}