101 lines
3.9 KiB
C#
101 lines
3.9 KiB
C#
//
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// AssumeDecoder.cs
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//
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// Authors:
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// Alexander Chebaturkin (chebaturkin@gmail.com)
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//
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// Copyright (C) 2011 Alexander Chebaturkin
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using Mono.CodeContracts.Static.AST;
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using Mono.CodeContracts.Static.AST.Visitors;
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using Mono.CodeContracts.Static.Analysis.ExpressionAnalysis.Expressions;
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using Mono.CodeContracts.Static.ControlFlow;
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using Mono.CodeContracts.Static.Lattices;
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namespace Mono.CodeContracts.Static.Analysis.ExpressionAnalysis {
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struct AssumeDecoder<SymbolicValue> : IExpressionILVisitor<APC, SymbolicValue, SymbolicValue, ExprDomain<SymbolicValue>, ExprDomain<SymbolicValue>>
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where SymbolicValue : IEquatable<SymbolicValue> {
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private readonly bool truth;
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public AssumeDecoder (bool truth)
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{
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this.truth = truth;
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}
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#region IExpressionILVisitor<APC,SymbolicValue,SymbolicValue,ExprDomain<SymbolicValue>,ExprDomain<SymbolicValue>> Members
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public ExprDomain<SymbolicValue> Binary (APC pc, BinaryOperator op, SymbolicValue dest, SymbolicValue s1, SymbolicValue s2, ExprDomain<SymbolicValue> data)
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{
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if (this.truth && op.IsEqualityOperator ()) {
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if (!data.HasRefinement (s1)) {
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FlatDomain<Expr<SymbolicValue>> expression2 = data [s2];
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if (expression2.IsNormal() && !data.IsReachableFrom (s2, s1))
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return data.Add (s1, expression2.Value);
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} else if (!data.HasRefinement (s2)) {
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FlatDomain<Expr<SymbolicValue>> expression1 = data [s1];
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if (expression1.IsNormal() && !data.IsReachableFrom (s1, s2))
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return data.Add (s2, expression1.Value);
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}
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}
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if (!this.truth && op == BinaryOperator.Cne_Un) {
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if (!data.HasRefinement (s1)) {
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FlatDomain<Expr<SymbolicValue>> expression2 = data [s2];
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if (expression2.IsNormal() && !data.IsReachableFrom (s2, s1))
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return data.Add (s1, expression2.Value);
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} else if (!data.HasRefinement (s2)) {
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FlatDomain<Expr<SymbolicValue>> expression1 = data [s1];
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if (expression1.IsNormal() && !data.IsReachableFrom (s1, s2))
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return data.Add (s2, expression1.Value);
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}
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}
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return data;
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}
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public ExprDomain<SymbolicValue> Isinst (APC pc, TypeNode type, SymbolicValue dest, SymbolicValue obj, ExprDomain<SymbolicValue> data)
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{
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return data;
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}
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public ExprDomain<SymbolicValue> LoadNull (APC pc, SymbolicValue dest, ExprDomain<SymbolicValue> polarity)
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{
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return polarity;
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}
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public ExprDomain<SymbolicValue> LoadConst (APC pc, TypeNode type, object constant, SymbolicValue dest, ExprDomain<SymbolicValue> data)
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{
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return data;
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}
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public ExprDomain<SymbolicValue> Sizeof (APC pc, TypeNode type, SymbolicValue dest, ExprDomain<SymbolicValue> data)
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{
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return data;
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}
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public ExprDomain<SymbolicValue> Unary (APC pc, UnaryOperator op, bool unsigned, SymbolicValue dest, SymbolicValue source, ExprDomain<SymbolicValue> data)
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{
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return data;
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}
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#endregion
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}
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}
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