add missing file

ICSharpCode.Decompiler/IL/Instructions/TransformStackIntoVariablesState.cs

@@ -0,0 +1,80 @@
+// Copyright (c) 2014 Daniel Grunwald
+// 
+// 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.Collections.Immutable;
+using System.Diagnostics;
+using System.Linq;
+
+namespace ICSharpCode.Decompiler.IL
+{
+	public class TransformStackIntoVariablesState : IInlineContext
+	{
+		public Stack<ILVariable> Variables { get; set; }
+		public UnionFind<ILVariable> UnionFind { get; set; }
+		public Dictionary<Block, ImmutableArray<ILVariable>> InitialVariables { get; set; }
+		public DecompilerTypeSystem TypeSystem { get; set; }
+
+		public TransformStackIntoVariablesState()
+		{
+			Variables = new Stack<ILVariable>();
+			UnionFind = new UnionFind<ILVariable>();
+			InitialVariables = new Dictionary<Block, ImmutableArray<ILVariable>>();
+		}
+
+		public void MergeVariables(Stack<ILVariable> a, Stack<ILVariable> b)
+		{
+			Debug.Assert(a.Count == b.Count);
+			var enum1 = a.GetEnumerator();
+			var enum2 = b.GetEnumerator();
+			while (enum1.MoveNext() && enum2.MoveNext())
+				UnionFind.Merge(enum1.Current, enum2.Current);
+		}
+
+		ILInstruction IInlineContext.Peek(InstructionFlags flagsBefore)
+		{
+			return new LdLoc(Variables.Peek());
+		}
+
+		ILInstruction IInlineContext.Pop(InstructionFlags flagsBefore)
+		{
+			return new LdLoc(Variables.Pop());
+		}
+	}
+	
+	public static class Extensions
+	{
+		public static Stack<T> Clone<T>(this Stack<T> inst)
+		{
+			if (inst == null)
+				throw new ArgumentNullException("inst");
+			return inst.ToImmutableArray().ToStack();
+		}
+
+		public static Stack<T> ToStack<T>(this ImmutableArray<T> inst)
+		{
+			var copy = new Stack<T>();
+			for (int i = inst.Length - 1; i >= 0; i--)
+				copy.Push(inst[i]);
+			return copy;
+		}
+	}
+}
+
+