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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;
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)
{
this.Source = source;
this.Target = target;
this.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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