Imported Upstream version 6.4.0.137

Former-commit-id: 943baa9f16a098c33e129777827f3a9d20da00d6

mcs/class/System.Private.CoreLib/System/RuntimeMethodHandle.cs

@@ -0,0 +1,86 @@
+using System.Reflection;
+using System.Runtime.Serialization;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace System
+{
+	[Serializable]
+	public readonly struct RuntimeMethodHandle : ISerializable
+	{
+		readonly IntPtr value;
+
+		internal RuntimeMethodHandle (IntPtr v)
+		{
+			value = v;
+		}
+
+		RuntimeMethodHandle (SerializationInfo info, StreamingContext context)
+		{
+			throw new PlatformNotSupportedException ();
+		}
+
+		public IntPtr Value => value;
+
+		public void GetObjectData (SerializationInfo info, StreamingContext context)
+		{
+			throw new PlatformNotSupportedException ();
+		}
+
+		[MethodImpl (MethodImplOptions.InternalCall)]
+		static extern IntPtr GetFunctionPointer (IntPtr m);
+
+		public IntPtr GetFunctionPointer ()
+		{
+			return GetFunctionPointer (value);
+		}
+
+		public override bool Equals (object? obj)
+		{
+			if (obj == null || GetType () != obj.GetType ())
+				return false;
+
+			return value == ((RuntimeMethodHandle)obj).Value;
+		}
+
+		public bool Equals (RuntimeMethodHandle handle)
+		{
+			return value == handle.Value;
+		}
+
+		public override int GetHashCode ()
+		{
+			return value.GetHashCode ();
+		}
+
+		public static bool operator == (RuntimeMethodHandle left, RuntimeMethodHandle right)
+		{
+			return left.Equals (right);
+		}
+
+		public static bool operator != (RuntimeMethodHandle left, RuntimeMethodHandle right)
+		{
+			return !left.Equals (right);
+		}
+
+		internal static string ConstructInstantiation (RuntimeMethodInfo method, TypeNameFormatFlags format)
+		{
+			var sb = new StringBuilder ();
+			var gen_params = method.GetGenericArguments ();
+			sb.Append ("[");
+			for (int j = 0; j < gen_params.Length; j++) {
+				if (j > 0)
+					sb.Append (",");
+				sb.Append (gen_params [j].Name);
+			}
+			sb.Append ("]");
+			return sb.ToString ();
+		}
+
+		internal bool IsNullHandle ()
+		{
+			return value == IntPtr.Zero;
+		}
+	}
+}