mcs/class/Mono.CodeContracts/Mono.CodeContracts.Static.Analysis.ExpressionAnalysis.Expressions/IsInstExpr.cs

   1 //
   2 // IsInstExpr.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 System.Collections.Generic;
  31 using Mono.CodeContracts.Static.AST;
  32 using Mono.CodeContracts.Static.ControlFlow;
  33 using Mono.CodeContracts.Static.DataStructures;
  34
  35 namespace Mono.CodeContracts.Static.Analysis.ExpressionAnalysis.Expressions {
  36         class IsInstExpr<TSymbolicValue> : Expr<TSymbolicValue> where TSymbolicValue : IEquatable<TSymbolicValue> {
  37                 public readonly TSymbolicValue Argument;
  38                 public readonly TypeNode Type;
  39
  40                 public IsInstExpr (TSymbolicValue argument, TypeNode type)
  41                 {
  42                         this.Argument = argument;
  43                         this.Type = type;
  44                 }
  45
  46                 #region Overrides of Expression
  47                 public override IEnumerable<TSymbolicValue> Variables
  48                 {
  49                         get { yield return this.Argument; }
  50                 }
  51
  52                 public override Result Decode<Data, Result, Visitor> (APC pc, TSymbolicValue dest, Visitor visitor, Data data)
  53                 {
  54                         return visitor.Isinst (pc, this.Type, dest, this.Argument, data);
  55                 }
  56
  57                 public override Expr<TSymbolicValue> Substitute (IImmutableMap<TSymbolicValue, Sequence<TSymbolicValue>> substitutions)
  58                 {
  59                         if (substitutions.ContainsKey (this.Argument))
  60                                 return new IsInstExpr<TSymbolicValue> (substitutions [this.Argument].Head, this.Type);
  61                         return null;
  62                 }
  63
  64                 public override bool IsContained (IImmutableSet<TSymbolicValue> candidates)
  65                 {
  66                         return candidates.Contains (this.Argument);
  67                 }
  68
  69                 public override bool Contains (TSymbolicValue symbol)
  70                 {
  71                         return this.Argument.Equals (symbol);
  72                 }
  73
  74                 public override string ToString ()
  75                 {
  76                         return String.Format ((string) "IsInst({0} {1})", (object) this.Type, (object) this.Argument);
  77                 }
  78
  79                 public override bool Equals (Expr<TSymbolicValue> other)
  80                 {
  81                         var inst = other as IsInstExpr<TSymbolicValue>;
  82
  83                         return (inst != null && inst.Type.Equals (this.Type) && inst.Argument.Equals (this.Argument));
  84                 }
  85                 #endregion
  86         }
  87 }