mcs/class/Mono.CodeContracts/Mono.CodeContracts.Static.AST.Visitors/CodeVisitor.cs

   1 //
   2 // CodeVisitor.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.Analysis;
  32 using Mono.CodeContracts.Static.ControlFlow;
  33 using Mono.CodeContracts.Static.DataFlowAnalysis;
  34 using Mono.CodeContracts.Static.DataStructures;
  35 using Mono.CodeContracts.Static.Providers;
  36
  37 namespace Mono.CodeContracts.Static.AST.Visitors {
  38         class CodeVisitor<Variable, Expression, ContextData, EdgeData>
  39                 : ILVisitorBase<APC, Expression, Variable, bool, bool>,
  40                   IAnalysis<APC, bool, IILVisitor<APC, Expression, Variable, bool, bool>, EdgeData>
  41                 where ContextData : IMethodContextProvider {
  42                 private ICodeLayer<Expression, Variable, ContextData, EdgeData> codeLayer;
  43
  44                 public ContextData Context
  45                 {
  46                         get { return this.codeLayer.ILDecoder.ContextProvider; }
  47                 }
  48
  49                 protected IMetaDataProvider MetaDataProvider
  50                 {
  51                         get { return this.codeLayer.MetaDataProvider; }
  52                 }
  53
  54                 public void Run (ICodeLayer<Expression, Variable, ContextData, EdgeData> codeLayer)
  55                 {
  56                         this.codeLayer = codeLayer;
  57                         codeLayer.CreateForward (this) (true);
  58                 }
  59
  60                 #region Overrides of ILVisitorBase<APC,Expression,Variable,bool,bool>
  61                 public override bool DefaultVisit (APC pc, bool data)
  62                 {
  63                         return data;
  64                 }
  65                 #endregion
  66
  67                 #region Implementation of IAnalysis<APC,bool,IILVisitor<APC,Expression,Variable,bool,bool>,EdgeData>
  68                 public IILVisitor<APC, Expression, Variable, bool, bool> GetVisitor ()
  69                 {
  70                         return this;
  71                 }
  72
  73                 public virtual bool Join (Pair<APC, APC> edge, bool newstate, bool prevstate, out bool weaker, bool widen)
  74                 {
  75                         weaker = false;
  76                         return true;
  77                 }
  78
  79                 public bool ImmutableVersion (bool arg)
  80                 {
  81                         return arg;
  82                 }
  83
  84                 public bool MutableVersion (bool arg)
  85                 {
  86                         return arg;
  87                 }
  88
  89                 public bool EdgeConversion (APC @from, APC to, bool isJoinPoint, EdgeData data, bool state)
  90                 {
  91                         return state;
  92                 }
  93
  94                 public bool IsBottom (APC pc, bool state)
  95                 {
  96                         return !state;
  97                 }
  98
  99                 public Predicate<APC> SaveFixPointInfo (IFixPointInfo<APC, bool> fixPointInfo)
 100                 {
 101                         return null;
 102                 }
 103
 104                 public void Dump (Pair<bool, TextWriter> pair)
 105                 {
 106                 }
 107                 #endregion
 108         }
 109 }