From 17fdde66d94155fc62a034fa6658995bef6fd6e5 Mon Sep 17 00:00:00 2001
From: Jason Smith <jason.smith@xamarin.com>
Date: Tue, 22 Mar 2016 13:02:25 -0700
Subject: Initial import

---
 .../FlowAnalysis/ControlFlowEdge.cs                | 78 ++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 ICSharpCode.Decompiler/FlowAnalysis/ControlFlowEdge.cs

(limited to 'ICSharpCode.Decompiler/FlowAnalysis/ControlFlowEdge.cs')

diff --git a/ICSharpCode.Decompiler/FlowAnalysis/ControlFlowEdge.cs b/ICSharpCode.Decompiler/FlowAnalysis/ControlFlowEdge.cs
new file mode 100644
index 00000000..98bd4399
--- /dev/null
+++ b/ICSharpCode.Decompiler/FlowAnalysis/ControlFlowEdge.cs
@@ -0,0 +1,78 @@
+// 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;
+
+namespace ICSharpCode.Decompiler.FlowAnalysis
+{
+	/// <summary>
+	/// Describes the type of a control flow egde.
+	/// </summary>
+	public enum JumpType
+	{
+		/// <summary>
+		/// A regular control flow edge.
+		/// </summary>
+		Normal,
+		/// <summary>
+		/// Jump to exception handler (an exception occurred)
+		/// </summary>
+		JumpToExceptionHandler,
+		/// <summary>
+		/// Jump from try block to leave target:
+		/// This is not a real jump, as the finally handler is executed first!
+		/// </summary>
+		LeaveTry,
+		/// <summary>
+		/// Jump at endfinally (to any of the potential leave targets).
+		/// For any leave-instruction, control flow enters the finally block - the edge to the leave target (LeaveTry) is not a real control flow edge.
+		/// EndFinally edges are inserted at the end of the finally block, jumping to any of the targets of the leave instruction.
+		/// This edge type is only used when copying of finally blocks is disabled (with copying, a normal deterministic edge is used at each copy of the endfinally node).
+		/// </summary>
+		EndFinally
+	}
+	
+	/// <summary>
+	/// Represents an edge in the control flow graph, pointing from Source to Target.
+	/// </summary>
+	public sealed class ControlFlowEdge
+	{
+		public readonly ControlFlowNode Source;
+		public readonly ControlFlowNode Target;
+		public readonly JumpType Type;
+		
+		public ControlFlowEdge(ControlFlowNode source, ControlFlowNode target, JumpType type)
+		{
+			Source = source;
+			Target = target;
+			Type = type;
+		}
+		
+		public override string ToString()
+		{
+			switch (Type) {
+				case JumpType.Normal:
+					return "#" + Target.BlockIndex;
+				case JumpType.JumpToExceptionHandler:
+					return "e:#" + Target.BlockIndex;
+				default:
+					return Type.ToString() + ":#" + Target.BlockIndex;
+			}
+		}
+	}
+}
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