//
// NewExpression.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.Collections.ObjectModel;
using System.Reflection;
using System.Reflection.Emit;
namespace System.Linq.Expressions{
public sealed class NewExpression : Expression {
ConstructorInfo constructor;
ReadOnlyCollection<Expression> arguments;
ReadOnlyCollection<MemberInfo> members;
public ConstructorInfo Constructor {
get { return constructor; }
}
public ReadOnlyCollection<Expression> Arguments {
get { return arguments; }
}
public ReadOnlyCollection<MemberInfo> Members {
get { return members; }
}
internal NewExpression (Type type, ReadOnlyCollection<Expression> arguments)
: base (ExpressionType.New, type)
{
this.arguments = arguments;
}
internal NewExpression (ConstructorInfo constructor, ReadOnlyCollection<Expression> arguments, ReadOnlyCollection<MemberInfo> members)
: base (ExpressionType.New, constructor.DeclaringType)
{
this.constructor = constructor;
this.arguments = arguments;
this.members = members;
}
internal override void Emit (EmitContext ec)
{
var ig = ec.ig;
var type = this.Type;
LocalBuilder local = null;
if (type.IsValueType) {
local = ig.DeclareLocal (type);
ig.Emit (OpCodes.Ldloca, local);
if (constructor == null) {
ig.Emit (OpCodes.Initobj, type);
ig.Emit (OpCodes.Ldloc, local);
return;
}
}
ec.EmitCollection (arguments);
if (type.IsValueType) {
ig.Emit (OpCodes.Call, constructor);
ig.Emit (OpCodes.Ldloc, local);
} else
ig.Emit (OpCodes.Newobj, constructor ?? GetDefaultConstructor (type));
}
static ConstructorInfo GetDefaultConstructor (Type type)
{
return type.GetConstructor (Type.EmptyTypes);
}
}
}
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