1 //
2 // VisitorForUnderlyingVariable.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 VisitorForUnderlyingVariable<V,E> : QueryVisitor<V, E>
35 		where V : IEquatable<V>
36 		where E : IEquatable<E> {
37 		private V Variable;
38 
IsUnderlyingVariable(E expr, FullExpressionDecoder<V, E> decoder)39 		public static V IsUnderlyingVariable (E expr, FullExpressionDecoder<V, E> decoder)
40 		{
41 			VisitorForUnderlyingVariable<V, E> visitor = decoder.UnderlyingVariableVisitor;
42 			Decode (expr, visitor, decoder);
43 			return visitor.Variable;
44 		}
45 
Binary(E pc, BinaryOperator op, V dest, E operand1, E operand2, Dummy data)46 		public override bool Binary (E pc, BinaryOperator op, V dest, E operand1, E operand2, Dummy data)
47 		{
48 			this.Variable = dest;
49 			return true;
50 		}
51 
Isinst(E pc, TypeNode type, V dest, E obj, Dummy data)52 		public override bool Isinst (E pc, TypeNode type, V dest, E obj, Dummy data)
53 		{
54 			this.Variable = dest;
55 			return true;
56 		}
57 
LoadConst(E pc, TypeNode type, object constant, V dest, Dummy data)58 		public override bool LoadConst (E pc, TypeNode type, object constant, V dest, Dummy data)
59 		{
60 			this.Variable = dest;
61 			return true;
62 		}
63 
LoadNull(E pc, V dest, Dummy polarity)64 		public override bool LoadNull (E pc, V dest, Dummy polarity)
65 		{
66 			this.Variable = dest;
67 			return true;
68 		}
69 
Sizeof(E pc, TypeNode type, V dest, Dummy data)70 		public override bool Sizeof (E pc, TypeNode type, V dest, Dummy data)
71 		{
72 			this.Variable = dest;
73 			return true;
74 		}
75 
SymbolicConstant(E pc, V variable, Dummy data)76 		public override bool SymbolicConstant (E pc, V variable, Dummy data)
77 		{
78 			this.Variable = variable;
79 			return true;
80 		}
81 
Unary(E pc, UnaryOperator op, bool unsigned, V dest, E source, Dummy data)82 		public override bool Unary (E pc, UnaryOperator op, bool unsigned, V dest, E source, Dummy data)
83 		{
84 			this.Variable = dest;
85 			return true;
86 		}
87 	}
88 }