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.
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22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
30 using System.Collections.ObjectModel;
31 using System.Reflection;
32 using System.Reflection.Emit;
34 namespace System.Linq.Expressions {
36 public sealed class NewArrayExpression : Expression {
38 ReadOnlyCollection<Expression> expressions;
40 public ReadOnlyCollection<Expression> Expressions {
41 get { return expressions; }
44 internal NewArrayExpression (ExpressionType et, Type type, ReadOnlyCollection<Expression> expressions)
47 this.expressions = expressions;
50 void EmitNewArrayInit (EmitContext ec, Type type)
52 var size = expressions.Count;
54 ec.ig.Emit (OpCodes.Ldc_I4, size);
55 ec.ig.Emit (OpCodes.Newarr, type);
57 for (int i = 0; i < size; i++) {
58 ec.ig.Emit (OpCodes.Dup);
59 ec.ig.Emit (OpCodes.Ldc_I4, i);
60 expressions [i].Emit (ec);
61 ec.ig.Emit (OpCodes.Stelem, type);
65 void EmitNewArrayBounds (EmitContext ec, Type type)
67 int rank = expressions.Count;
69 ec.EmitCollection (expressions);
72 ec.ig.Emit (OpCodes.Newarr, type);
76 ec.ig.Emit(OpCodes.Newobj, GetArrayConstructor (type, rank));
79 static ConstructorInfo GetArrayConstructor (Type type, int rank)
81 return CreateArray (type, rank).GetConstructor (CreateTypeParameters (rank));
84 static Type [] CreateTypeParameters (int rank)
86 var types = new Type [rank];
87 for (int i = 0; i < rank; i++)
88 types [i] = typeof (int);
93 static Type CreateArray (Type type, int rank)
95 return type.MakeArrayType (rank);
98 internal override void Emit (EmitContext ec)
100 var type = this.Type.GetElementType ();
102 switch (this.NodeType) {
103 case ExpressionType.NewArrayInit:
104 EmitNewArrayInit (ec, type);
106 case ExpressionType.NewArrayBounds:
107 EmitNewArrayBounds (ec, type);
110 throw new NotSupportedException ();