Imported Upstream version 6.4.0.137

Former-commit-id: 943baa9f16a098c33e129777827f3a9d20da00d6

mcs/class/System.Private.CoreLib/System.Reflection/FieldInfo.cs

@@ -0,0 +1,105 @@
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+namespace System.Reflection
+{
+	partial class FieldInfo
+	{
+		[MethodImplAttribute(MethodImplOptions.InternalCall)]
+		private static extern FieldInfo internal_from_handle_type (IntPtr field_handle, IntPtr type_handle);
+
+		public static FieldInfo GetFieldFromHandle (RuntimeFieldHandle handle)
+		{
+			if (handle.IsNullHandle ())
+				throw new ArgumentException (SR.Argument_InvalidHandle);
+			return internal_from_handle_type (handle.Value, IntPtr.Zero);
+		}
+
+		public static FieldInfo GetFieldFromHandle (RuntimeFieldHandle handle, RuntimeTypeHandle declaringType)
+		{
+			if (handle.IsNullHandle ())
+				throw new ArgumentException (SR.Argument_InvalidHandle);
+			FieldInfo fi = internal_from_handle_type (handle.Value, declaringType.Value);
+			if (fi == null)
+				throw new ArgumentException ("The field handle and the type handle are incompatible.");
+			return fi;
+		}
+
+		internal virtual int GetFieldOffset ()
+		{
+			throw NotImplemented.ByDesign;
+		}
+
+		[MethodImplAttribute(MethodImplOptions.InternalCall)]
+		private extern MarshalAsAttribute get_marshal_info ();
+
+		internal object[] GetPseudoCustomAttributes ()
+		{
+			int count = 0;
+
+			if (IsNotSerialized)
+				count ++;
+
+			if (DeclaringType.IsExplicitLayout)
+				count ++;
+
+			MarshalAsAttribute marshalAs = get_marshal_info ();
+			if (marshalAs != null)
+				count ++;
+
+			if (count == 0)
+				return null;
+			object[] attrs = new object [count];
+			count = 0;
+
+			if (IsNotSerialized)
+				attrs [count ++] = new NonSerializedAttribute ();
+			if (DeclaringType.IsExplicitLayout)
+				attrs [count ++] = new FieldOffsetAttribute (GetFieldOffset ());
+			if (marshalAs != null)
+				attrs [count ++] = marshalAs;
+
+			return attrs;
+		}
+
+		internal CustomAttributeData[] GetPseudoCustomAttributesData ()
+		{
+			int count = 0;
+
+			if (IsNotSerialized)
+				count++;
+
+			if (DeclaringType.IsExplicitLayout)
+				count++;
+
+			MarshalAsAttribute marshalAs = get_marshal_info ();
+			if (marshalAs != null)
+				count++;
+
+			if (count == 0)
+				return null;
+			CustomAttributeData[] attrsData = new CustomAttributeData [count];
+			count = 0;
+
+			if (IsNotSerialized)
+				attrsData [count++] = new CustomAttributeData ((typeof (NonSerializedAttribute)).GetConstructor (Type.EmptyTypes));
+			if (DeclaringType.IsExplicitLayout) {
+				var ctorArgs = new CustomAttributeTypedArgument[] { new CustomAttributeTypedArgument (typeof (int), GetFieldOffset ()) };
+				attrsData [count++] = new CustomAttributeData (
+					(typeof (FieldOffsetAttribute)).GetConstructor (new[] { typeof (int) }),
+					ctorArgs,
+					Array.Empty<CustomAttributeNamedArgument> ());
+			}
+
+			if (marshalAs != null) {
+				var ctorArgs = new CustomAttributeTypedArgument[] { new CustomAttributeTypedArgument (typeof (UnmanagedType), marshalAs.Value) };
+				attrsData [count++] = new CustomAttributeData (
+					(typeof (MarshalAsAttribute)).GetConstructor (new[] { typeof (UnmanagedType) }),
+					ctorArgs,
+					Array.Empty<CustomAttributeNamedArgument> ());//FIXME Get named params
+			}
+
+			return attrsData;
+		}
+	}
+}