mcs/class/Mono.CodeContracts/Mono.CodeContracts.Static.Analysis.ExpressionAnalysis/AnalysisDecoder.cs

   1 //
   2 // AnalysisDecoder.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.AST.Visitors;
  32 using Mono.CodeContracts.Static.Analysis.ExpressionAnalysis.Expressions;
  33 using Mono.CodeContracts.Static.ControlFlow;
  34 using Mono.CodeContracts.Static.Lattices;
  35
  36 namespace Mono.CodeContracts.Static.Analysis.ExpressionAnalysis {
  37         class AnalysisDecoder<TSymValue> : ILVisitorBase<APC, TSymValue, TSymValue, ExprDomain<TSymValue>, ExprDomain<TSymValue>>
  38                 where TSymValue : IEquatable<TSymValue> {
  39                 public override ExprDomain<TSymValue> DefaultVisit (APC pc, ExprDomain<TSymValue> data)
  40                 {
  41                         return data;
  42                 }
  43
  44                 public override ExprDomain<TSymValue> Assume (APC pc, EdgeTag tag, TSymValue condition, ExprDomain<TSymValue> data)
  45                 {
  46                         FlatDomain<Expr<TSymValue>> aExpression = data [condition];
  47
  48                         if (aExpression.IsNormal) {
  49                                 bool truth = tag != EdgeTag.False;
  50                                 data = aExpression.Concrete.Decode<ExprDomain<TSymValue>, ExprDomain<TSymValue>, AssumeDecoder<TSymValue>>
  51                                         (pc, condition, new AssumeDecoder<TSymValue> (truth), data);
  52                         }
  53
  54                         return data;
  55                 }
  56
  57                 public override ExprDomain<TSymValue> Assert (APC pc, EdgeTag tag, TSymValue condition, ExprDomain<TSymValue> data)
  58                 {
  59                         FlatDomain<Expr<TSymValue>> expression = data [condition];
  60                         if (expression.IsNormal) {
  61                                 data = expression.Concrete.Decode<ExprDomain<TSymValue>, ExprDomain<TSymValue>, AssumeDecoder<TSymValue>>
  62                                         (pc, condition, new AssumeDecoder<TSymValue> (true), data);
  63                         }
  64
  65                         return data;
  66                 }
  67
  68                 public override ExprDomain<TSymValue> Binary (APC pc, BinaryOperator op, TSymValue dest, TSymValue operand1, TSymValue operand2, ExprDomain<TSymValue> data)
  69                 {
  70                         return data.Add (dest, new BinaryExpr<TSymValue> (operand1, operand2, op));
  71                 }
  72
  73                 public override ExprDomain<TSymValue> Isinst (APC pc, TypeNode type, TSymValue dest, TSymValue obj, ExprDomain<TSymValue> data)
  74                 {
  75                         return data.Add (dest, new IsInstExpr<TSymValue> (obj, type));
  76                 }
  77
  78                 public override ExprDomain<TSymValue> LoadConst (APC pc, TypeNode type, object constant, TSymValue dest, ExprDomain<TSymValue> data)
  79                 {
  80                         return data.Add (dest, new ConstExpr<TSymValue> (type, constant));
  81                 }
  82
  83                 public override ExprDomain<TSymValue> LoadNull (APC pc, TSymValue dest, ExprDomain<TSymValue> polarity)
  84                 {
  85                         return polarity.Add (dest, NullExpr<TSymValue>.Instance);
  86                 }
  87
  88                 public override ExprDomain<TSymValue> Sizeof (APC pc, TypeNode type, TSymValue dest, ExprDomain<TSymValue> data)
  89                 {
  90                         return data.Add (dest, new SizeOfExpr<TSymValue> (type));
  91                 }
  92
  93                 public override ExprDomain<TSymValue> Unary (APC pc, UnaryOperator op, bool unsigned, TSymValue dest, TSymValue source, ExprDomain<TSymValue> data)
  94                 {
  95                         return data.Add (dest, new UnaryExpr<TSymValue> (source, op, unsigned));
  96                 }
  97         }
  98 }