//
// NewArrayExpression.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.Linq;
using System.Reflection;
using System.Reflection.Emit;
namespace System.Linq.Expressions{
public sealed class NewArrayExpression : Expression {
ReadOnlyCollection<Expression> expressions;
public ReadOnlyCollection<Expression> Expressions {
get { return expressions; }
}
internal NewArrayExpression (ExpressionType et, Type type, ReadOnlyCollection<Expression> expressions)
: base (et, type)
{
this.expressions = expressions;
}
void EmitNewArrayInit (EmitContext ec, Type type)
{
var size = expressions.Count;
ec.ig.Emit (OpCodes.Ldc_I4, size);
ec.ig.Emit (OpCodes.Newarr, type);
for (int i = 0; i < size; i++) {
ec.ig.Emit (OpCodes.Dup);
ec.ig.Emit (OpCodes.Ldc_I4, i);
expressions [i].Emit (ec);
ec.ig.Emit (OpCodes.Stelem, type);
}
}
void EmitNewArrayBounds (EmitContext ec, Type type)
{
int rank = expressions.Count;
ec.EmitCollection (expressions);
if (rank == 1) {
ec.ig.Emit (OpCodes.Newarr, type);
return;
}
ec.ig.Emit(OpCodes.Newobj, GetArrayConstructor (type, rank));
}
static ConstructorInfo GetArrayConstructor (Type type, int rank)
{
return CreateArray (type, rank).GetConstructor (CreateTypeParameters (rank));
}
static Type [] CreateTypeParameters (int rank)
{
return Enumerable.Repeat (typeof (int), rank).ToArray ();
}
static Type CreateArray (Type type, int rank)
{
return type.MakeArrayType (rank);
}
internal override void Emit (EmitContext ec)
{
var type = this.Type.GetElementType ();
switch (this.NodeType) {
case ExpressionType.NewArrayInit:
EmitNewArrayInit (ec, type);
return;
case ExpressionType.NewArrayBounds:
EmitNewArrayBounds (ec, type);
return;
default:
throw new NotSupportedException ();
}
}
}
}
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