NativeCallableAttribute + AddOf intrinsic

gistfile1.txt

using System;
using System.Runtime.InteropServices;

namespace System.Runtime.InteropServices
{
    [AttributeUsage(AttributeTargets.Method)]
    public sealed class NativeCallableAttribute : Attribute
    {
        public string EntryPoint;
        public CallingConvention CallingConvention;

        public NativeCallableAttribute()
        {
        }
    }

    [AttributeUsage((System.AttributeTargets.Method | System.AttributeTargets.Class))]
    public class McgIntrinsicsAttribute : Attribute
    {
    }

    [McgIntrinsics]
    public static class AddrOfIntrinsics
    {
        // This method is implemented elsewhere in the toolchain
        internal static IntPtr AddrOf<T>(T ftn) { throw new PlatformNotSupportedException(); }
    }
}

internal class Program
{
    [NativeCallable]
    private static void foo()
    {
    }

    private static void Main(string[] args)
    {
        Console.WriteLine(AddrOfIntrinsics.AddrOf(new Action(foo)).ToString("x"));
    }
}