MethodTable.cs

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using System.Runtime.InteropServices;
 
namespace System.Runtime.CompilerServices;
 
[StructLayout(LayoutKind.Explicit)]
internal struct MethodTable
{
    [FieldOffset(0)]
    public ushort ComponentSize;
 
    [FieldOffset(0)]
    private uint Flags;
 
    [FieldOffset(4)]
    public uint BaseSize;
 
    [FieldOffset(14)]
    public ushort InterfaceCount;
 
    [FieldOffset(16)]
    public unsafe MethodTable* ParentMethodTable;
 
    [FieldOffset(48)]
    public unsafe void* ElementType;
 
    [FieldOffset(56)]
    public unsafe MethodTable** InterfaceMap;
 
    public bool HasComponentSize => (Flags & 0x80000000u) != 0;
 
    public bool ContainsGCPointers => (Flags & 0x1000000) != 0;
 
    public bool NonTrivialInterfaceCast => (Flags & 0x406C0000) != 0;
 
    public unsafe bool IsMultiDimensionalArray
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        get
        {
            return BaseSize > (uint)(3 * sizeof(IntPtr));
        }
    }
 
    public unsafe int MultiDimensionalArrayRank
    {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        get
        {
            return (int)((uint)((int)BaseSize - 3 * sizeof(IntPtr)) / 8u);
        }
    }
}