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diff --git a/ICSharpCode.Decompiler/CodeMappings.cs b/ICSharpCode.Decompiler/CodeMappings.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 System.Linq;
+using ICSharpCode.Decompiler.ILAst;
+using ICSharpCode.NRefactory;
+using Mono.Cecil;
+
+namespace ICSharpCode.Decompiler
+{
+	/// <summary> Maps method's source code to IL </summary>
+	public class MethodDebugSymbols
+	{
+		public MethodDefinition CecilMethod { get; set; }
+		public List<ILVariable> LocalVariables { get; set; }
+		public List<SequencePoint> SequencePoints { get; set; }
+		public TextLocation StartLocation { get; set; }
+		public TextLocation EndLocation { get; set; }
+		
+		public MethodDebugSymbols(MethodDefinition methodDef)
+		{
+			CecilMethod = methodDef;
+			LocalVariables = new List<ILVariable>();
+			SequencePoints = new List<SequencePoint>();
+		}
+	}
+	
+	public class SequencePoint
+	{
+		public ILRange[] ILRanges { get; set; }
+		public TextLocation StartLocation { get; set; }
+		public TextLocation EndLocation { get; set; }
+		public int ILOffset { get { return ILRanges[0].From; } }
+		
+		public override string ToString()
+		{
+			return string.Join(" ", ILRanges) + " " + StartLocation + "-" + EndLocation;
+		}
+	}
+}