mono/mcs/class/System.ServiceModel/Mono.CodeGeneration/CodeOr.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 CodeOr: CodeConditionExpression
	{
		CodeExpression exp1;
		CodeExpression exp2;
		Type t1;
		Type t2;
		
		public CodeOr (CodeExpression exp1, CodeExpression exp2)
		{
			this.exp1 = exp1;
			this.exp2 = exp2;
			
 			if (exp1.GetResultType () != typeof(bool) || exp1.GetResultType () != typeof(bool)) {
				if (t1 != t2)
					throw new InvalidOperationException ("Can't compare values of different primitive types");
			}
		}
		
		public override void Generate (ILGenerator gen)
		{
			Label trueLabel = gen.DefineLabel ();
			Label endLabel = gen.DefineLabel ();
			
			if (exp1 is CodeConditionExpression)
				((CodeConditionExpression)exp1).GenerateForBranch (gen, trueLabel, true);
			else {
				exp1.Generate (gen);
				gen.Emit (OpCodes.Brtrue, trueLabel);
			}
				
			exp2.Generate (gen);
			gen.Emit (OpCodes.Br, endLabel);
			gen.MarkLabel(trueLabel);
			gen.Emit (OpCodes.Ldc_I4_1);
			gen.MarkLabel(endLabel);
		}
		
		public override void GenerateForBranch (ILGenerator gen, Label label, bool branchCase)
		{
			Label endLabel = gen.DefineLabel ();
			exp1.Generate (gen);
			
			if (exp1 is CodeConditionExpression) {
				if (branchCase)
					((CodeConditionExpression)exp1).GenerateForBranch (gen, label, true);
				else
					((CodeConditionExpression)exp1).GenerateForBranch (gen, endLabel, true);
			}
			else {
				exp1.Generate (gen);
				if (branchCase)
					gen.Emit (OpCodes.Brtrue, label);
				else
					gen.Emit (OpCodes.Brtrue, endLabel);
			}

			if (exp2 is CodeConditionExpression) {
				if (branchCase)
					((CodeConditionExpression)exp2).GenerateForBranch (gen, label, true);
				else
					((CodeConditionExpression)exp2).GenerateForBranch (gen, label, false);
			}
			else {
				exp2.Generate (gen);
				if (branchCase)
					gen.Emit (OpCodes.Brtrue, label);
				else
					gen.Emit (OpCodes.Brfalse, label);
			}
			
			gen.MarkLabel(endLabel);
		}
		
		public override void PrintCode (CodeWriter cp)
		{
			cp.Write ("(");
			exp1.PrintCode (cp);
			cp.Write (" || ");
			exp2.PrintCode (cp);
			cp.Write (")");
		}
		
		public override Type GetResultType ()
		{
			return typeof (bool);
		}
	}
}