2 // NewArrayExpression.cs
5 // Jb Evain (jbevain@novell.com)
7 // (C) 2008 Novell, Inc. (http://www.novell.com)
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
30 using System.Collections.ObjectModel;
32 using System.Reflection;
33 using System.Reflection.Emit;
35 namespace System.Linq.Expressions {
37 public sealed class NewArrayExpression : Expression {
39 ReadOnlyCollection<Expression> expressions;
41 public ReadOnlyCollection<Expression> Expressions {
42 get { return expressions; }
45 internal NewArrayExpression (ExpressionType et, Type type, ReadOnlyCollection<Expression> expressions)
48 this.expressions = expressions;
52 void EmitNewArrayInit (EmitContext ec, Type type)
54 var size = expressions.Count;
56 ec.ig.Emit (OpCodes.Ldc_I4, size);
57 ec.ig.Emit (OpCodes.Newarr, type);
59 for (int i = 0; i < size; i++) {
60 ec.ig.Emit (OpCodes.Dup);
61 ec.ig.Emit (OpCodes.Ldc_I4, i);
62 expressions [i].Emit (ec);
63 ec.ig.Emit (OpCodes.Stelem, type);
67 void EmitNewArrayBounds (EmitContext ec, Type type)
69 int rank = expressions.Count;
71 ec.EmitCollection (expressions);
74 ec.ig.Emit (OpCodes.Newarr, type);
78 ec.ig.Emit(OpCodes.Newobj, GetArrayConstructor (type, rank));
81 static ConstructorInfo GetArrayConstructor (Type type, int rank)
83 return CreateArray (type, rank).GetConstructor (CreateTypeParameters (rank));
86 static Type [] CreateTypeParameters (int rank)
88 return Enumerable.Repeat (typeof (int), rank).ToArray ();
91 static Type CreateArray (Type type, int rank)
93 return type.MakeArrayType (rank);
96 internal override void Emit (EmitContext ec)
98 var type = this.Type.GetElementType ();
100 switch (this.NodeType) {
101 case ExpressionType.NewArrayInit:
102 EmitNewArrayInit (ec, type);
104 case ExpressionType.NewArrayBounds:
105 EmitNewArrayBounds (ec, type);
108 throw new NotSupportedException ();