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//
// ConditionalExpression.cs
//
// Author:
// Jb Evain (jbevain@novell.com)
//
// (C) 2008 Novell, Inc. (http://www.novell.com)
//
// 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;
using System.Reflection.Emit;
namespace System.Linq.Expressions {
public sealed class ConditionalExpression : Expression {
Expression test;
Expression if_true;
Expression if_false;
public Expression Test {
get { return test; }
}
public Expression IfTrue {
get { return if_true; }
}
public Expression IfFalse {
get { return if_false; }
}
internal ConditionalExpression (Expression test, Expression if_true, Expression if_false)
: base (ExpressionType.Conditional, if_true.Type)
{
this.test = test;
this.if_true = if_true;
this.if_false = if_false;
}
internal override void Emit (EmitContext ec)
{
var ig = ec.ig;
var false_target = ig.DefineLabel ();
var end_target = ig.DefineLabel ();
test.Emit (ec);
ig.Emit (OpCodes.Brfalse, false_target);
if_true.Emit (ec);
ig.Emit (OpCodes.Br, end_target);
ig.MarkLabel (false_target);
if_false.Emit (ec);
ig.MarkLabel (end_target);
}
}
}
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