ILSpy/ICSharpCode.Decompiler/IL/Instructions/ThreeValuedLogicInstructions.cs

// Copyright (c) 2017 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
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// 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
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using System.Diagnostics;

namespace ICSharpCode.Decompiler.IL
{
	// Note: The comp instruction also supports three-valued logic via ComparisonLiftingKind.ThreeValuedLogic.
	// comp.i4.lifted[3VL](x == ldc.i4 0) is used to represent a lifted logic.not.

	partial class ThreeValuedLogicAnd : ILiftableInstruction
	{
		bool ILiftableInstruction.IsLifted => true;
		StackType ILiftableInstruction.UnderlyingResultType => StackType.I4;

		internal override void CheckInvariant(ILPhase phase)
		{
			base.CheckInvariant(phase);
			Debug.Assert(Left.ResultType == StackType.I4 || Left.ResultType == StackType.O);
		}
	}

	partial class ThreeValuedLogicOr : ILiftableInstruction
	{
		bool ILiftableInstruction.IsLifted => true;
		StackType ILiftableInstruction.UnderlyingResultType => StackType.I4;

		internal override void CheckInvariant(ILPhase phase)
		{
			base.CheckInvariant(phase);
			Debug.Assert(Left.ResultType == StackType.I4 || Left.ResultType == StackType.O);
		}
	}
}