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diff --git a/ICSharpCode.Decompiler/FlowAnalysis/SsaVariable.cs b/ICSharpCode.Decompiler/FlowAnalysis/SsaVariable.cs
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+++ b/ICSharpCode.Decompiler/FlowAnalysis/SsaVariable.cs
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+// Copyright (c) 2011 AlphaSierraPapa for the SharpDevelop Team
+// 
+// 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 System;
+using System.Collections.Generic;
+using Mono.Cecil;
+using Mono.Cecil.Cil;
+
+namespace ICSharpCode.Decompiler.FlowAnalysis
+{
+	/// <summary>
+	/// Represents a variable used with the SsaInstruction register-based instructions.
+	/// Despite what the name suggests, the variable is not necessarily in single-assignment form - take a look at "bool IsSingleAssignment".
+	/// </summary>
+	public sealed class SsaVariable
+	{
+		public int OriginalVariableIndex;
+		public readonly string Name;
+		public readonly bool IsStackLocation;
+		
+		public readonly ParameterDefinition Parameter;
+		public readonly VariableDefinition Variable;
+		
+		public SsaVariable(ParameterDefinition p)
+		{
+			Name = string.IsNullOrEmpty(p.Name) ? "param" + p.Index : p.Name;
+			Parameter = p;
+		}
+		
+		public SsaVariable(VariableDefinition v)
+		{
+			Name = string.IsNullOrEmpty(v.Name) ? "V_" + v.Index : v.Name;
+			Variable = v;
+		}
+		
+		public SsaVariable(int stackLocation)
+		{
+			Name = "stack" + stackLocation;
+			IsStackLocation = true;
+		}
+		
+		public SsaVariable(SsaVariable original, string newName)
+		{
+			Name = newName;
+			IsStackLocation = original.IsStackLocation;
+			OriginalVariableIndex = original.OriginalVariableIndex;
+			Parameter = original.Parameter;
+			Variable = original.Variable;
+		}
+		
+		public override string ToString()
+		{
+			return Name;
+		}
+		
+		/// <summary>
+		/// Gets whether this variable has only a single assignment.
+		/// This field is initialized in TransformToSsa step.
+		/// </summary>
+		/// <remarks>Not all variables can be transformed to single assignment form: variables that have their address taken
+		/// cannot be represented in SSA (although SimplifyByRefCalls will get rid of the address-taking instruction in almost all cases)</remarks>
+		public bool IsSingleAssignment;
+		
+		/// <summary>
+		/// Gets the instruction defining the variable.
+		/// This field is initialized in TransformToSsa step. It is only set for variables with a single assignment.
+		/// </summary>
+		public SsaInstruction Definition;
+		
+		/// <summary>
+		/// Gets the places where a variable is used.
+		/// If a single instruction reads a variable 2 times (e.g. adding to itself), then it must be included 2 times in this list!
+		/// </summary>
+		public List<SsaInstruction> Usage;
+	}
+}