ICorDebugObjectValue.GetFieldValue returning incorrect ICorDebugValue for Struct with two FieldOffset(0)

[WardenGnaw]

Source Code

using System;
using System.Runtime.InteropServices;

namespace ConsoleApp2
{
    [StructLayout(LayoutKind.Explicit, Pack = 1)]
    struct Union
    {
        [FieldOffset(0)]
        public byte[] Bytes;
        [FieldOffset(0)]
        public int[] Ints;
    }
    class Program
    {
        static void Main(string[] args)
        {
            var union = new Union();
            union.Bytes = new byte[64];
            union.Bytes[0] = 1;
            union.Bytes[1] = 2;

            Console.WriteLine("Int: " + union.Ints[0] + " " + union.Ints[1]);
        }
    }
}

When calling ICorDebugObjectValue.GetFieldValue, with the correct ICorDebugClass for the Union struct and with the MetadataToken for Ints, the return ICorDebugValue's ICorDebugType ends up with the wrong type being bytes[] (instead of int[])

However, this works correctly when given the MetadataToken for Bytes.

We use ICorDebugValue2.GetExactType to get the type.

If you look at the locals or watch union in the EE window, both Bytes and Ints are displayed as byte[].

[tommcdon]

@hoyosjs

[dotnet-policy-service]

Due to lack of recent activity, this issue has been marked as a candidate for backlog cleanup. It will be closed if no further activity occurs within 14 more days. Any new comment (by anyone, not necessarily the author) will undo this process.

This process is part of our issue cleanup automation.

[dotnet-policy-service]

This issue will now be closed since it had been marked no-recent-activity but received no further activity in the past 14 days. It is still possible to reopen or comment on the issue, but please note that the issue will be locked if it remains inactive for another 30 days.