mcs/class/Mono.CodeContracts/Mono.CodeContracts.Static.Analysis.ExpressionAnalysis.Decoding/VisitorForIsInst.cs

   1 //
   2 // VisitorForIsInst.cs
   3 //
   4 // Authors:
   5 //      Alexander Chebaturkin (chebaturkin@gmail.com)
   6 //
   7 // Copyright (C) 2011 Alexander Chebaturkin
   8 //
   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:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  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.
  27 //
  28
  29 using System;
  30 using Mono.CodeContracts.Static.AST;
  31 using Mono.CodeContracts.Static.DataStructures;
  32
  33 namespace Mono.CodeContracts.Static.Analysis.ExpressionAnalysis.Decoding {
  34         class VisitorForIsInst<V, E> : QueryVisitor<V, E>
  35                 where V : IEquatable<V>
  36                 where E : IEquatable<E> {
  37
  38                 private E argument;
  39                 private TypeNode type;
  40
  41                 public static bool IsIsInst (E expr, out TypeNode type, out E arg, FullExpressionDecoder<V,E> decoder)
  42                 {
  43                         VisitorForIsInst<V, E> v = decoder.IsInstVisitor;
  44                         bool res = Decode (expr, v, decoder);
  45
  46                         arg = v.argument;
  47                         type = v.type;
  48                         return res;
  49                 }
  50
  51                 public override bool Isinst (E pc, TypeNode type, V dest, E obj, Dummy data)
  52                 {
  53                         this.type = type;
  54                         this.argument = obj;
  55                         return true;
  56                 }
  57         }
  58 }