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

   1 //
   2 // ExpressionPrinterFactory.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.Text;
  31 using Mono.CodeContracts.Static.AST;
  32 using Mono.CodeContracts.Static.AST.Visitors;
  33 using Mono.CodeContracts.Static.Analysis.Drivers;
  34 using Mono.CodeContracts.Static.Analysis.HeapAnalysis;
  35 using Mono.CodeContracts.Static.ControlFlow;
  36 using Mono.CodeContracts.Static.DataStructures;
  37
  38 namespace Mono.CodeContracts.Static.Analysis.ExpressionAnalysis {
  39         static class ExpressionPrinterFactory {
  40                 public static Func<LabeledSymbol<APC, SymbolicValue>, string> Printer<SymbolicValue>
  41                         (IExpressionContextProvider<LabeledSymbol<APC, SymbolicValue>, SymbolicValue> contextProvider,
  42                          IMethodDriver<LabeledSymbol<APC, SymbolicValue>, SymbolicValue> methodDriver)
  43                         where SymbolicValue : IEquatable<SymbolicValue>
  44                 {
  45                         return new PrinterImpl<SymbolicValue> (contextProvider, methodDriver).PrintAt;
  46                 }
  47
  48                 #region Nested type: PrinterImpl
  49                 private class PrinterImpl<SymbolicValue> :
  50                         ISymbolicExpressionVisitor<LabeledSymbol<APC, SymbolicValue>, LabeledSymbol<APC, SymbolicValue>, SymbolicValue, StringBuilder, Dummy>
  51                         where SymbolicValue : IEquatable<SymbolicValue> {
  52                         private readonly IExpressionContextProvider<LabeledSymbol<APC, SymbolicValue>, SymbolicValue> context_provider;
  53                         private readonly IMethodDriver<LabeledSymbol<APC, SymbolicValue>, SymbolicValue> method_driver;
  54
  55                         public PrinterImpl (IExpressionContextProvider<LabeledSymbol<APC, SymbolicValue>, SymbolicValue> contextProvider,
  56                                             IMethodDriver<LabeledSymbol<APC, SymbolicValue>, SymbolicValue> methodDriver)
  57                         {
  58                                 this.context_provider = contextProvider;
  59                                 this.method_driver = methodDriver;
  60                         }
  61
  62                         public string PrintAt (LabeledSymbol<APC, SymbolicValue> expr)
  63                         {
  64                                 var sb = new StringBuilder ();
  65                                 Recurse (sb, expr);
  66                                 return sb.ToString ();
  67                         }
  68
  69                         private void Recurse (StringBuilder sb, LabeledSymbol<APC, SymbolicValue> expr)
  70                         {
  71                                 if (expr.Symbol.Equals (default(SymbolicValue)))
  72                                         sb.Append ("<!null!>");
  73                                 else
  74                                         this.context_provider.ExpressionContext.Decode<StringBuilder, Dummy, PrinterImpl<SymbolicValue>> (expr, this, sb);
  75                         }
  76
  77                         #region Implementation of IExpressionILVisitor<ExternalExpression<APC,SymbolicValue>,ExternalExpression<APC,SymbolicValue>,SymbolicValue,StringBuilder,Dummy>
  78                         public Dummy Binary (LabeledSymbol<APC, SymbolicValue> pc, BinaryOperator op, SymbolicValue dest, LabeledSymbol<APC, SymbolicValue> operand1, LabeledSymbol<APC, SymbolicValue> operand2,
  79                                              StringBuilder data)
  80                         {
  81                                 data.Append ('(');
  82                                 Recurse (data, operand1);
  83                                 data.AppendFormat (" {0} ", op);
  84                                 Recurse (data, operand2);
  85                                 data.Append (')');
  86                                 return Dummy.Value;
  87                         }
  88
  89                         public Dummy Isinst (LabeledSymbol<APC, SymbolicValue> pc, TypeNode type, SymbolicValue dest, LabeledSymbol<APC, SymbolicValue> obj, StringBuilder data)
  90                         {
  91                                 data.AppendFormat ("IsInst({0}) ", this.method_driver.MetaDataProvider.FullName (type));
  92                                 Recurse (data, obj);
  93                                 return Dummy.Value;
  94                         }
  95
  96                         public Dummy LoadNull (LabeledSymbol<APC, SymbolicValue> pc, SymbolicValue dest, StringBuilder polarity)
  97                         {
  98                                 polarity.Append ("NULL");
  99                                 return Dummy.Value;
 100                         }
 101
 102                         public Dummy LoadConst (LabeledSymbol<APC, SymbolicValue> pc, TypeNode type, object constant, SymbolicValue dest, StringBuilder data)
 103                         {
 104                                 data.Append (constant.ToString ());
 105                                 return Dummy.Value;
 106                         }
 107
 108                         public Dummy Sizeof (LabeledSymbol<APC, SymbolicValue> pc, TypeNode type, SymbolicValue dest, StringBuilder data)
 109                         {
 110                                 data.AppendFormat ("sizeof({0})", this.method_driver.MetaDataProvider.FullName (type));
 111                                 return Dummy.Value;
 112                         }
 113
 114                         public Dummy Unary (LabeledSymbol<APC, SymbolicValue> pc, UnaryOperator op, bool unsigned, SymbolicValue dest, LabeledSymbol<APC, SymbolicValue> source, StringBuilder data)
 115                         {
 116                                 data.AppendFormat ("{0} ", op.ToString ());
 117                                 Recurse (data, source);
 118                                 return Dummy.Value;
 119                         }
 120                         #endregion
 121
 122                         #region Implementation of ISymbolicExpressionVisitor<ExternalExpression<APC,SymbolicValue>,ExternalExpression<APC,SymbolicValue>,SymbolicValue,StringBuilder,Dummy>
 123                         public Dummy SymbolicConstant (LabeledSymbol<APC, SymbolicValue> pc, SymbolicValue variable, StringBuilder data)
 124                         {
 125                                 data.Append (variable.ToString ());
 126                                 return Dummy.Value;
 127                         }
 128                         #endregion
 129                 }
 130                 #endregion
 131         }
 132 }