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diff --git a/Mono.Cecil/ParameterDefinition.cs b/Mono.Cecil/ParameterDefinition.cs
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+//
+// ParameterDefinition.cs
+//
+// Author:
+//   Jb Evain (jbevain@gmail.com)
+//
+// Copyright (c) 2008 - 2010 Jb Evain
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+using Mono.Collections.Generic;
+
+namespace Mono.Cecil {
+
+	public sealed class ParameterDefinition : ParameterReference, ICustomAttributeProvider, IConstantProvider, IMarshalInfoProvider {
+
+		ushort attributes;
+
+		internal IMethodSignature method;
+
+		object constant = Mixin.NotResolved;
+		Collection<CustomAttribute> custom_attributes;
+		MarshalInfo marshal_info;
+
+		public ParameterAttributes Attributes {
+			get { return (ParameterAttributes) attributes; }
+			set { attributes = (ushort) value; }
+		}
+
+		public IMethodSignature Method {
+			get { return method; }
+		}
+
+		public bool HasConstant {
+			get {
+				ResolveConstant ();
+
+				return constant != Mixin.NoValue;
+			}
+			set { if (!value) constant = Mixin.NoValue; }
+		}
+
+		public object Constant {
+			get { return HasConstant ? constant : null;	}
+			set { constant = value; }
+		}
+
+		void ResolveConstant ()
+		{
+			if (constant != Mixin.NotResolved)
+				return;
+
+			this.ResolveConstant (ref constant, parameter_type.Module);
+		}
+
+		internal bool HasImage {
+			get { return parameter_type != null && parameter_type.Module != null && parameter_type.Module.HasImage; }
+		}
+
+		public bool HasCustomAttributes {
+			get {
+				if (custom_attributes != null)
+					return custom_attributes.Count > 0;
+
+				return this.GetHasCustomAttributes (parameter_type.Module);
+			}
+		}
+
+		public Collection<CustomAttribute> CustomAttributes {
+			get {
+				if (custom_attributes != null)
+					return custom_attributes;
+
+				return this.GetCustomAttributes (ref custom_attributes, parameter_type.Module);
+			}
+		}
+
+		public bool HasMarshalInfo {
+			get {
+				if (marshal_info != null)
+					return true;
+
+				return this.GetHasMarshalInfo (parameter_type.Module);
+			}
+		}
+
+		public MarshalInfo MarshalInfo {
+			get {
+				if (marshal_info != null)
+					return marshal_info;
+
+				return this.GetMarshalInfo (ref marshal_info, parameter_type.Module);
+			}
+			set { marshal_info = value; }
+		}
+
+		#region ParameterAttributes
+
+		public bool IsIn {
+			get { return attributes.GetAttributes ((ushort) ParameterAttributes.In); }
+			set { attributes = attributes.SetAttributes ((ushort) ParameterAttributes.In, value); }
+		}
+
+		public bool IsOut {
+			get { return attributes.GetAttributes ((ushort) ParameterAttributes.Out); }
+			set { attributes = attributes.SetAttributes ((ushort) ParameterAttributes.Out, value); }
+		}
+
+		public bool IsOptional {
+			get { return attributes.GetAttributes ((ushort) ParameterAttributes.Optional); }
+			set { attributes = attributes.SetAttributes ((ushort) ParameterAttributes.Optional, value); }
+		}
+
+		public bool HasDefault {
+			get { return attributes.GetAttributes ((ushort) ParameterAttributes.HasDefault); }
+			set { attributes = attributes.SetAttributes ((ushort) ParameterAttributes.HasDefault, value); }
+		}
+
+		#endregion
+
+		public ParameterDefinition (TypeReference parameterType)
+			: this (string.Empty, ParameterAttributes.None, parameterType)
+		{
+		}
+
+		public ParameterDefinition (string name, ParameterAttributes attributes, TypeReference parameterType)
+			: base (name, parameterType)
+		{
+			this.attributes = (ushort) attributes;
+			this.token = new MetadataToken (TokenType.Param);
+		}
+
+		public override ParameterDefinition Resolve ()
+		{
+			return this;
+		}
+	}
+}