83 lines
4.0 KiB
C#
83 lines
4.0 KiB
C#
//
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// IntervalAssumeFalseVisitor.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) 2012 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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namespace Mono.CodeContracts.Static.Analysis.Numerical {
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class IntervalAssumeFalseVisitor<TVar, TExpr, TInterval, TNumeric> :
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AssumeFalseVisitor<IntervalEnvironmentBase<TVar, TExpr, TInterval, TNumeric>, TVar, TExpr>
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where TInterval : IntervalBase<TInterval, TNumeric>
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where TVar : IEquatable<TVar> {
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public IntervalAssumeFalseVisitor (IExpressionDecoder<TVar, TExpr> decoder)
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: base (decoder)
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{
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}
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public override IntervalEnvironmentBase<TVar, TExpr, TInterval, TNumeric> Visit (TExpr expr,
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IntervalEnvironmentBase
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<TVar, TExpr,
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TInterval,
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TNumeric> data)
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{
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var res = base.Visit (expr, data);
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if (!Decoder.IsBinaryExpression (expr))
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return res;
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var left = Decoder.LeftExpressionFor (expr);
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var right = Decoder.RightExpressionFor (expr);
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var intv = data.Eval (right);
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if (intv.IsBottom)
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return data.Bottom;
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if (!intv.IsSinglePoint)
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return res;
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switch (Decoder.OperatorFor (expr)) {
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case ExpressionOperator.LessThan: {
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var leftVar = Decoder.UnderlyingVariable (left);
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return res.Assumer.AssumeLessEqualThan (intv, leftVar, res);
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}
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case ExpressionOperator.LessEqualThan: {
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var leftVar = Decoder.UnderlyingVariable (left);
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return res.Assumer.AssumeLessThan (intv, leftVar, res);
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}
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}
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return data;
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}
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protected override IntervalEnvironmentBase<TVar, TExpr, TInterval, TNumeric> DispatchCompare (
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CompareVisitor cmp, TExpr left, TExpr right, TExpr original,
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IntervalEnvironmentBase<TVar, TExpr, TInterval, TNumeric> data)
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{
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data = cmp (left, right, original, data);
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return base.DispatchCompare (cmp, left, right, original, data);
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}
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}
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} |