Merge pull request #409 from Alkarex/patch-1
[mono.git] / mcs / class / Mono.CodeContracts / Mono.CodeContracts.Static.Analysis.ExpressionAnalysis.Expressions / ConstExpr.cs
1 // 
2 // ConstExpr.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 ConstExpr<TSymbolicValue> : Expr<TSymbolicValue> where TSymbolicValue : IEquatable<TSymbolicValue> {
37                 public readonly TypeNode Type;
38                 public readonly object value;
39
40                 public ConstExpr (TypeNode type, object value)
41                 {
42                         this.Type = type;
43                         this.value = value;
44                 }
45
46                 #region Overrides of Expression
47                 public override IEnumerable<TSymbolicValue> Variables
48                 {
49                         get { yield break; }
50                 }
51
52                 public override Result Decode<Data, Result, Visitor> (APC pc, TSymbolicValue dest, Visitor visitor, Data data)
53                 {
54                         return visitor.LoadConst (pc, this.Type, this.value, dest, data);
55                 }
56
57                 public override Expr<TSymbolicValue> Substitute (IImmutableMap<TSymbolicValue, Sequence<TSymbolicValue>> substitutions)
58                 {
59                         return this;
60                 }
61
62                 public override bool IsContained (IImmutableSet<TSymbolicValue> candidates)
63                 {
64                         return false;
65                 }
66
67                 public override bool Contains (TSymbolicValue symbol)
68                 {
69                         return false;
70                 }
71
72                 public override string ToString ()
73                 {
74                         return String.Format ("Const({0} {1})", this.Type, this.value);
75                 }
76
77                 public override bool Equals (Expr<TSymbolicValue> other)
78                 {
79                         var constant = other as ConstExpr<TSymbolicValue>;
80
81                         return constant != null && constant.Type.Equals (this.Type) && constant.value.Equals (this.value);
82                 }
83                 #endregion
84         }
85 }