2 // Permission is hereby granted, free of charge, to any person obtaining
3 // a copy of this software and associated documentation files (the
4 // "Software"), to deal in the Software without restriction, including
5 // without limitation the rights to use, copy, modify, merge, publish,
6 // distribute, sublicense, and/or sell copies of the Software, and to
7 // permit persons to whom the Software is furnished to do so, subject to
8 // the following conditions:
10 // The above copyright notice and this permission notice shall be
11 // included in all copies or substantial portions of the Software.
13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
14 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
15 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
16 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
17 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
18 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
19 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21 // Copyright (C) Lluis Sanchez Gual, 2004
26 using System.Reflection;
27 using System.Reflection.Emit;
28 using Mono.CodeGeneration;
30 namespace Mono.CodeGeneration
32 public class CodeIs: CodeConditionExpression
37 public CodeIs (Type type, CodeExpression exp)
43 public override void Generate (ILGenerator gen)
45 Type typeObj = exp.GetResultType ();
47 if (type.IsAssignableFrom (typeObj)) {
48 gen.Emit (OpCodes.Ldc_I4_1);
51 else if (!typeObj.IsAssignableFrom (type)) {
52 gen.Emit (OpCodes.Ldc_I4_0);
57 gen.Emit (OpCodes.Isinst, type);
58 gen.Emit (OpCodes.Ldnull);
59 gen.Emit (OpCodes.Cgt_Un);
62 public override void GenerateForBranch (ILGenerator gen, Label label, bool branchCase)
64 Type typeObj = exp.GetResultType ();
66 if (type.IsAssignableFrom (typeObj)) {
68 gen.Emit (OpCodes.Br, label);
71 else if (!typeObj.IsAssignableFrom (type)) {
73 gen.Emit (OpCodes.Br, label);
78 gen.Emit (OpCodes.Isinst, type);
80 gen.Emit (OpCodes.Brtrue, label);
82 gen.Emit (OpCodes.Brfalse, label);
85 public override void PrintCode (CodeWriter cp)
89 cp.Write (type.FullName);
92 public override Type GetResultType ()