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

// 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;

namespace ICSharpCode.Decompiler.IL
{
	partial class Loop
	{
		public override void WriteTo(ITextOutput output)
		{
			output.Write("loop ");
			body.WriteTo(output);
		}
		
		protected override InstructionFlags ComputeFlags()
		{
			return Block.Phase1Boundary(body.Flags)
				| InstructionFlags.EndPointUnreachable
				| InstructionFlags.SideEffect; // an infinite loop is a side effect
		}
		
		internal override ILInstruction Inline(InstructionFlags flagsBefore, IInlineContext context)
		{
			return this;
		}
		
		internal override void TransformStackIntoVariables(TransformStackIntoVariablesState state)
		{
			var initialVariables = state.Variables.Clone();
			Body = Body.Inline(InstructionFlags.None, state);
			Body.TransformStackIntoVariables(state);
			state.MergeVariables(initialVariables, state.Variables);
		}
	}
}