Imported Upstream version 5.0.0.42

Former-commit-id: fd56571888259555122d8a0f58c68838229cea2b

external/linker/cecil/Mono.Cecil/Modifiers.cs

@@ -0,0 +1,119 @@
+//
+// Author:
+//   Jb Evain (jbevain@gmail.com)
+//
+// Copyright (c) 2008 - 2015 Jb Evain
+// Copyright (c) 2008 - 2011 Novell, Inc.
+//
+// Licensed under the MIT/X11 license.
+//
+
+using System;
+
+using MD = Mono.Cecil.Metadata;
+
+namespace Mono.Cecil {
+
+	public interface IModifierType {
+		TypeReference ModifierType { get; }
+		TypeReference ElementType { get; }
+	}
+
+	public sealed class OptionalModifierType : TypeSpecification, IModifierType {
+
+		TypeReference modifier_type;
+
+		public TypeReference ModifierType {
+			get { return modifier_type; }
+			set { modifier_type = value; }
+		}
+
+		public override string Name {
+			get { return base.Name + Suffix; }
+		}
+
+		public override string FullName {
+			get { return base.FullName + Suffix; }
+		}
+
+		string Suffix {
+			get { return " modopt(" + modifier_type + ")"; }
+		}
+
+		public override bool IsValueType {
+			get { return false; }
+			set { throw new InvalidOperationException (); }
+		}
+
+		public override bool IsOptionalModifier {
+			get { return true; }
+		}
+
+		public override bool ContainsGenericParameter {
+			get { return modifier_type.ContainsGenericParameter || base.ContainsGenericParameter; }
+		}
+
+		public OptionalModifierType (TypeReference modifierType, TypeReference type)
+			: base (type)
+		{
+			Mixin.CheckModifier (modifierType, type);
+			this.modifier_type = modifierType;
+			this.etype = MD.ElementType.CModOpt;
+		}
+	}
+
+	public sealed class RequiredModifierType : TypeSpecification, IModifierType {
+
+		TypeReference modifier_type;
+
+		public TypeReference ModifierType {
+			get { return modifier_type; }
+			set { modifier_type = value; }
+		}
+
+		public override string Name {
+			get { return base.Name + Suffix; }
+		}
+
+		public override string FullName {
+			get { return base.FullName + Suffix; }
+		}
+
+		string Suffix {
+			get { return " modreq(" + modifier_type + ")"; }
+		}
+
+		public override bool IsValueType {
+			get { return false; }
+			set { throw new InvalidOperationException (); }
+		}
+
+		public override bool IsRequiredModifier {
+			get { return true; }
+		}
+
+		public override bool ContainsGenericParameter {
+			get { return modifier_type.ContainsGenericParameter || base.ContainsGenericParameter; }
+		}
+
+		public RequiredModifierType (TypeReference modifierType, TypeReference type)
+			: base (type)
+		{
+			Mixin.CheckModifier (modifierType, type);
+			this.modifier_type = modifierType;
+			this.etype = MD.ElementType.CModReqD;
+		}
+
+	}
+
+	static partial class Mixin {
+
+		public static void CheckModifier (TypeReference modifierType, TypeReference type)
+		{
+			if (modifierType == null)
+				throw new ArgumentNullException ("modifierType");
+			if (type == null)
+				throw new ArgumentNullException ("type");
+		}
+	}
+}