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

   1 //
   2 // UnaryExpr.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 UnaryExpr<TSymbolicValue> : Expr<TSymbolicValue> where TSymbolicValue : IEquatable<TSymbolicValue> {
  37                 public readonly UnaryOperator Operator;
  38                 public readonly TSymbolicValue Source;
  39                 public readonly bool Unsigned;
  40
  41                 public UnaryExpr (TSymbolicValue source, UnaryOperator op, bool unsigned)
  42                 {
  43                         this.Source = source;
  44                         this.Operator = op;
  45                         this.Unsigned = unsigned;
  46                 }
  47
  48                 #region Overrides of Expression
  49                 public override IEnumerable<TSymbolicValue> Variables
  50                 {
  51                         get { yield return this.Source; }
  52                 }
  53
  54                 public override Result Decode<Data, Result, Visitor> (APC pc, TSymbolicValue dest, Visitor visitor, Data data)
  55                 {
  56                         return visitor.Unary (pc, this.Operator, this.Unsigned, dest, this.Source, data);
  57                 }
  58
  59                 public override Expr<TSymbolicValue> Substitute (IImmutableMap<TSymbolicValue, Sequence<TSymbolicValue>> substitutions)
  60                 {
  61                         if (substitutions.ContainsKey (this.Source))
  62                                 return new UnaryExpr<TSymbolicValue> (substitutions [this.Source].Head, this.Operator, this.Unsigned);
  63
  64                         return null;
  65                 }
  66
  67                 public override bool IsContained (IImmutableSet<TSymbolicValue> candidates)
  68                 {
  69                         return candidates.Contains (this.Source);
  70                 }
  71
  72                 public override bool Contains (TSymbolicValue symbol)
  73                 {
  74                         return symbol.Equals (this.Source);
  75                 }
  76
  77                 public override string ToString ()
  78                 {
  79                         return String.Format ("Unary({0} {1})", this.Operator, this.Source);
  80                 }
  81
  82                 public override bool Equals (Expr<TSymbolicValue> other)
  83                 {
  84                         var unary = other as UnaryExpr<TSymbolicValue>;
  85                         if (unary == null || unary.Operator != this.Operator || unary.Unsigned != this.Unsigned)
  86                                 return false;
  87
  88                         return unary.Source.Equals (this.Source);
  89                 }
  90                 #endregion
  91         }
  92 }