mono/mcs/class/System.ServiceModel/Mono.CodeGeneration/CodeUnaryOperation.cs

//
// 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.
//
// Copyright (C) Lluis Sanchez Gual, 2004
//

using System;
using System.Reflection;
using System.Reflection.Emit;

namespace Mono.CodeGeneration
{
	public class CodeNeg: CodeExpression
	{
		CodeExpression exp;
		
		public CodeNeg (CodeExpression exp)
		{
			this.exp = exp;
			if (!exp.IsNumber)
				throw new InvalidOperationException ("Operator '-' cannot be applied to operand of type '" + exp.GetResultType().FullName + "'");
		}
		
		public override void Generate (ILGenerator gen)
		{
			exp.Generate (gen);
			gen.Emit (OpCodes.Neg);
		}
		
		public override void PrintCode (CodeWriter cp)
		{
			cp.Write ("-");
			exp.PrintCode (cp);
		}
		
		public override Type GetResultType ()
		{
			return exp.GetResultType();
		}
	}
	
	public class CodeNot: CodeConditionExpression
	{
		CodeExpression exp;
		
		public CodeNot (CodeExpression exp)
		{
			this.exp = exp;
			if (exp.GetResultType() != typeof(bool))
				throw new InvalidOperationException ("Operator '!' cannot be applied to operand of type '" + exp.GetResultType().FullName + "'");
		}
		
		public override void Generate (ILGenerator gen)
		{
			exp.Generate (gen);
			gen.Emit (OpCodes.Ldc_I4_0);
			gen.Emit (OpCodes.Ceq);
		}
		
		public override void GenerateForBranch (ILGenerator gen, Label label, bool branchCase)
		{
			if (exp is CodeConditionExpression) {
				((CodeConditionExpression)exp).GenerateForBranch (gen, label, !branchCase);
			}
			else {
				exp.Generate (gen);
				if (branchCase)
					gen.Emit (OpCodes.Brfalse, label);
				else
					gen.Emit (OpCodes.Brtrue, label);
			}
		}
		
		public override void PrintCode (CodeWriter cp)
		{
			cp.Write ("!");
			exp.PrintCode (cp);
		}
		
		public override Type GetResultType ()
		{
			return typeof(bool);
		}
	}
}