[runtime] Pointers are not Objects

[EgorBo]

Steps to Reproduce

using System;
using System.Runtime.CompilerServices;

class Program
{
    static unsafe void Main()
    {
        Console.WriteLine(Test(new int*[0]));
    }

    [MethodImpl(MethodImplOptions.NoInlining)]
    static unsafe bool Test(Array a)
    {
        return a is object[];
    }
}

Current Behavior

True

Expected Behavior

False (CoreCLR)

On which platforms did you notice this

[v] macOS
[ ] Linux
[ ] Windows

Version Used:

6.3.0.120

I guess the fix should be somewhere here https://github.com/mono/mono/blob/master/mono/mini/type-checking.c#L684-L689
Related xunit tests (netcore):

-nomethod System.Tests.ArrayTests.LastIndexOf_ArrayOfPointers_ThrowsNotSupportedException
-nomethod System.Tests.ArrayTests.Reverse_ArrayOfPointers_ThrowsNotSupportedException
-nomethod System.Tests.ArrayTests.IndexOf_ArrayOfPointers_ThrowsNotSupportedException

[marek-safar]

@lambdageek please assign

[lambdageek]

@CoffeeFlux please take a look at this

[filipnavara]

@CoffeeFlux I believe the xunit exclusions were not updated in

mono/netcore/CoreFX.issues.rsp

Lines 545 to 548 in a5a26a2

	# https://github.com/mono/mono/issues/14555 Array of pointers is not array of objects
	-nomethod System.Tests.ArrayTests.LastIndexOf_ArrayOfPointers_ThrowsNotSupportedException
	-nomethod System.Tests.ArrayTests.Reverse_ArrayOfPointers_ThrowsNotSupportedException
	-nomethod System.Tests.ArrayTests.IndexOf_ArrayOfPointers_ThrowsNotSupportedException

[CoffeeFlux]

Ah, yeah, totally forgot about that since I just added my own tests. I'll make a second PR; thanks for the heads-up!