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

   1 //
   2 // ValueAnalysis.cs
   3 //
   4 // Authors:
   5 //      Alexander Chebaturkin (chebaturkin@gmail.com)
   6 //
   7 // Copyright (C) 2012 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.IO;
  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.DataFlowAnalysis;
  35 using Mono.CodeContracts.Static.DataStructures;
  36 using Mono.CodeContracts.Static.Lattices;
  37
  38 namespace Mono.CodeContracts.Static.Analysis.ExpressionAnalysis {
  39         class ValueAnalysis<SymbolicValue, Context, EdgeData> : IAnalysis<APC, ExprDomain<SymbolicValue>,
  40                                                                          IILVisitor<APC, SymbolicValue, SymbolicValue, ExprDomain<SymbolicValue>, ExprDomain<SymbolicValue>>, EdgeData>
  41                         where SymbolicValue : IEquatable<SymbolicValue>
  42                         where Context : IValueContextProvider<SymbolicValue>
  43                         where EdgeData : IImmutableMap<SymbolicValue, Sequence<SymbolicValue>> {
  44                 private readonly ExpressionAnalysisFacade<SymbolicValue, Context, EdgeData> parent;
  45
  46                 public ValueAnalysis (ExpressionAnalysisFacade<SymbolicValue, Context, EdgeData> parent)
  47                 {
  48                         this.parent = parent;
  49                 }
  50
  51                 #region Implementation of IAnalysis<APC,ExpressionAnalysis<Local,Parameter,Method,Field,Property,Event,Type,Attribute,Assembly,SymbolicValue,contextProvider,EdgeData>.Domain,IILVisitor<APC,Local,Parameter,Method,Field,Type,SymbolicValue,SymbolicValue,ExpressionAnalysis<Local,Parameter,Method,Field,Property,Event,Type,Attribute,Assembly,SymbolicValue,contextProvider,EdgeData>.Domain,ExpressionAnalysis<Local,Parameter,Method,Field,Property,Event,Type,Attribute,Assembly,SymbolicValue,contextProvider,EdgeData>.Domain>,EdgeData>
  52                 public ExprDomain<SymbolicValue> EdgeConversion (APC @from, APC to, bool isJoinPoint, EdgeData sourceTargetMap, ExprDomain<SymbolicValue> originalState)
  53                 {
  54                         if (sourceTargetMap == null)
  55                                 return originalState;
  56
  57                         if (DebugOptions.Debug)
  58                         {
  59                                 Console.WriteLine ("====Expression analysis Parallel assign====");
  60                                 DumpMap (sourceTargetMap);
  61                                 DumpExpressions ("original expressions", originalState);
  62                         }
  63
  64                         ExprDomain<SymbolicValue> result = originalState.Empty ();
  65                         ExprDomain<SymbolicValue> domain = originalState.Empty ();
  66
  67                         foreach (SymbolicValue sv in originalState.Keys) {
  68                                 Expr<SymbolicValue> expression = originalState [sv].Value.Substitute (sourceTargetMap);
  69                                 if (expression != null)
  70                                         domain = domain.Add (sv, expression);
  71                         }
  72
  73                         foreach (SymbolicValue sv in sourceTargetMap.Keys) {
  74                                 FlatDomain<Expr<SymbolicValue>> expressionDomain = domain [sv];
  75                                 if (expressionDomain.IsNormal()) {
  76                                         Expr<SymbolicValue> expression = expressionDomain.Value;
  77                                         foreach (SymbolicValue sub in sourceTargetMap [sv].AsEnumerable ())
  78                                                 result = result.Add (sub, expression);
  79                                 }
  80                         }
  81
  82                         if (DebugOptions.Debug)
  83                         {
  84                                 DumpExpressions ("new expressions", result);
  85                         }
  86                         return result;
  87                 }
  88
  89                 public IILVisitor<APC, SymbolicValue, SymbolicValue, ExprDomain<SymbolicValue>, ExprDomain<SymbolicValue>> GetVisitor ()
  90                 {
  91                         return new AnalysisDecoder<SymbolicValue> ();
  92                 }
  93
  94                 public ExprDomain<SymbolicValue> Join (Pair<APC, APC> edge, ExprDomain<SymbolicValue> newstate, ExprDomain<SymbolicValue> prevstate, out bool weaker, bool widen)
  95                 {
  96                         return prevstate.Join (newstate, widen, out weaker);
  97                 }
  98
  99                 public ExprDomain<SymbolicValue> ImmutableVersion (ExprDomain<SymbolicValue> arg)
 100                 {
 101                         return arg;
 102                 }
 103
 104                 public ExprDomain<SymbolicValue> MutableVersion (ExprDomain<SymbolicValue> arg)
 105                 {
 106                         return arg;
 107                 }
 108
 109                 public bool IsBottom (APC pc, ExprDomain<SymbolicValue> state)
 110                 {
 111                         return state.IsBottom;
 112                 }
 113
 114                 public Predicate<APC> SaveFixPointInfo (IFixPointInfo<APC, ExprDomain<SymbolicValue>> fixPointInfo)
 115                 {
 116                         this.parent.SaveFixPointInfo (fixPointInfo);
 117                         return pc => true;
 118                 }
 119
 120                 public void Dump (Pair<ExprDomain<SymbolicValue>, TextWriter> pair)
 121                 {
 122                         pair.Key.Dump (pair.Value);
 123                 }
 124
 125                 private void DumpMap (IImmutableMap<SymbolicValue, Sequence<SymbolicValue>> sourceTargetMap)
 126                 {
 127                         Console.WriteLine ("Source-Target assignment");
 128                         foreach (SymbolicValue key in sourceTargetMap.Keys) {
 129                                 foreach (SymbolicValue value in sourceTargetMap [key].AsEnumerable ())
 130                                         Console.Write ("{0} ", value);
 131                                 Console.WriteLine (" := {0}", key);
 132                         }
 133                 }
 134
 135                 private void DumpExpressions (string header, ExprDomain<SymbolicValue> state)
 136                 {
 137                         Console.WriteLine ("--- {0} ---", header);
 138                         foreach (SymbolicValue index in state.Keys) {
 139                                 FlatDomain<Expr<SymbolicValue>> domain = state [index];
 140                                 if (domain.IsNormal())
 141                                         Console.WriteLine ("{0} -> {1}", index, domain.Value);
 142                                 else if (domain.IsTop)
 143                                         Console.WriteLine ("{0} -> (Top)", index);
 144                                 else if (domain.IsBottom)
 145                                         Console.WriteLine ("{0} -> (Bot)", index);
 146                         }
 147                 }
 148                 #endregion
 149         }
 150 }