在Microsoft.Research.Abs​​tractDomains.Numerical.Rational.op_Division处除以零错误

问题描述

 CodeContracts：ClrExtensions40：未捕获异常失败：尝试除以零。 
 CodeContracts：ClrExtensions40：堆栈跟踪：在Microsoft.Research.Abs​​tractDomains.Numerical.Rational.op_Division（Rational r1，Rational r2）
 CodeContracts：ClrExtensions40：at Microsoft.Research.Abs​​tractDomains.Numerical.IntervalEnvironment`2 .HelperFortestTrueLessThan_AxLtK（Polynomial`2 guardInCanonicalForm）
 CodeContracts：ClrExtensions40：at Microsoft.Research.Abs​​tractDomains.Numerical.IntervalEnvironment`2.TestTrueLessThan（Expression left，Expression right）
 CodeContracts：ClrExtensions40：at Microsoft.Research。 AbstractDomains.Numerical.IntervalEnvironment_Base`5.IntervalsTrueTestVisitor.VisitLessThan（表达式左，表达式右，表达式原始，此数据）
 CodeContracts：ClrExtensions40：at Microsoft.Research.Abs​​tractDomains.GenericExpressionVisitor`4.DispatchCompare（CompareVisitor cmp，Expression left ，表达权，表达式原文，在数据中）
 CodeContracts：ClrExtensions40：at Microsoft.Research.Abs​​tractDomains.GenericE xpressionVisitor`4.DispatchVisitNot（Expression exp，In data）
 CodeContracts：ClrExtensions40：at Microsoft.Research.Abs​​tractDomains.GenericExpressionVisitor`4.Visit（Expression exp，In data）
 CodeContracts：ClrExtensions40：at Microsoft。 Research.Abs​​tractDomains.Numerical.IntervalEnvironment_Base`5.IntervalsTrueTestVisitor.Visit（Expression exp，This data）
 CodeContracts：ClrExtensions40：at Microsoft.Research.Abs​​tractDomains.Numerical.IntervalEnvironment_Base`5.TestTrue（Expression guard）
 CodeContracts：ClrExtensions40：at Microsoft.Research.Abs​​tractDomains.Numerical.Pentagons`2.TestTrue（Expression guard）
 CodeContracts：ClrExtensions40：at Microsoft.Research.Abs​​tractDomains.Numerical.PentagonsPlus`2.TestTrue（Expression guard）
 CodeContracts：ClrExtensions40：at Microsoft.Research.Abs​​tractDomains.ReducedNumericalDomains`4.TestTrue（Expression guard）
 CodeContracts：ClrExtensions40：at Microsoft.Research.Abs​​tractDomains.Numerical.NumericalDo mainWithKarr`2.TestTrue（Expression guard）
 CodeContracts：ClrExtensions40：at Microsoft.Research.Abs​​tractDomains.ReducedNumericalDomains`4.TestTrue（Expression guard）
 CodeContracts：ClrExtensions40：at Microsoft.Research.CodeAnalysis.AnalysisWrapper。 TypeBindings`10.AILogicInference`1.CheckIfImplicationHolds（AbstractDomain adomain，FList`1 posAssumptions，FList`1 negAssumptions，BoxedExpression goal）
 CodeContracts：ClrExtensions40：at Microsoft.Research.CodeAnalysis.AnalysisWrapper.TypeBindings`10.AILogicInference`1 .IsTrueImply（APC pc，FList`1 posAssumptions，FList`1 negAssumptions，BoxedExpression goal）
 CodeContracts：ClrExtensions40：at Microsoft.Research.CodeAnalysis.ComposedFactQuery`1.IsTrueImply（APC pc，FList`1 posAssumptions，FList` 1 negAssumptions，BoxedExpression目标）
 CodeContracts：ClrExtensions40：at Microsoft.Research.CodeAnalysis.WeakestPreconditionProver.TypeBinder`11.Exploration.TryProvingTheImplication（Path head）
 CodeContracts： ClrExtensions40：at Microsoft.Research.CodeAnalysis.WeakestPreconditionProver.TypeBinder`11.Exploration.DischargePath（Path head）
 CodeContracts：ClrExtensions40：at Microsoft.Research.CodeAnalysis.WeakestPreconditionProver.TypeBinder`11.Exploration.ExpandPath（Path head， FList`1&安培;路径）
 CodeContracts：ClrExtensions40：at Microsoft.Research.CodeAnalysis.WeakestPreconditionProver.TypeBinder`11.Exploration.DischargePaths（FList`1 paths）
 CodeContracts：ClrExtensions40：at Microsoft.Research.CodeAnalysis.WeakestPreconditionProver.TypeBinder `11.DischargeObligation（IMethodDriver`12 mdriver，IFactQuery`2 fact，Int32 maxPathSize，APC pc，BoxedExpression goalExpression）
 CodeContracts：ClrExtensions40：at Microsoft.Research.CodeAnalysis.WeakestPreconditionProver.TypeBinder`11.DischargeObligation（IMethodDriver`12 mdriver，IFactQuery`2 fact，Int32 maxPathSize，APC pc，Variable goal）
 CodeContracts：ClrExtensions40：at Microsoft.Research.CodeAnalysis.WeakestPreconditionProver.Discharge [Local，Parameter，Method，Field，Property，Type，Attribute，Assembly ，表达式，变量，LogOptions]（APC pc，变量目标，Int32 maxPathSize，IMethodDriver`12 mdriver，IFactQuery`2事实）
 CodeContracts：ClrExtensions40：at Microsoft.Research.CodeAnalysis.Asser tionFinder.TypeBindings`10.ValidateAssertions（IMethodDriver`12 mdriver，FList`1 results，IOutputResults output，AssertionStatistics& assertStats）
 CodeContracts：ClrExtensions40：at Microsoft.Research.CodeAnalysis.AssertionFinder.ValidateAssertions [Local，Parameter，Method，Field，Property，Type，Attribute，Assembly，Expression，Variable]（IMethodDriver`12 driver，FList`1结果，IOutputResults输出，AssertionStatistics& assertStats）
 CodeContracts：ClrExtensions40：at Microsoft.Research.CodeAnalysis.Clousot.TypeBinder`8.AnalyzeNonIteratorMethodInternal（Method method）
 CodeContracts：ClrExtensions40：at Microsoft.Research.CodeAnalysis。 Clousot.TypeBinder`8.AnalyzeMethodInternal（Method method）
 CodeContracts：ClrExtensions40：at Microsoft.Research.CodeAnalysis.Clousot.TypeBinder`8.AnalyzeMethod（Method method）
 CodeContracts：ClrExtensions40：at Microsoft.Research。 CodeAnalysis.Clousot.TypeBinder`8.AnalyzeAssembly（String assemblyName，Set`1 assembliesUnderAnalysis）
 CodeContracts：ClrExtensions40：at Microsoft.Research.CodeAnalysis.Clousot.TypeBinder`8.InternalAnalyze（）
 CodeCo ntracts：ClrExtensions40：at Microsoft.Research.CodeAnalysis.Clousot.TypeBinder`8.Analyze（）
 CodeContracts：ClrExtensions40：
 CodeContracts：ClrExtensions40：完成后台合同分析。 
 

解决方案

CodeContracts: ClrExtensions40: Failed with uncaught exception: Attempted to divide by zero.
CodeContracts: ClrExtensions40: Stack trace:    at Microsoft.Research.AbstractDomains.Numerical.Rational.op_Division(Rational r1, Rational r2)
CodeContracts: ClrExtensions40:    at Microsoft.Research.AbstractDomains.Numerical.IntervalEnvironment`2.HelperFortestTrueLessThan_AxLtK(Polynomial`2 guardInCanonicalForm)
CodeContracts: ClrExtensions40:    at Microsoft.Research.AbstractDomains.Numerical.IntervalEnvironment`2.TestTrueLessThan(Expression left, Expression right)
CodeContracts: ClrExtensions40:    at Microsoft.Research.AbstractDomains.Numerical.IntervalEnvironment_Base`5.IntervalsTrueTestVisitor.VisitLessThan(Expression left, Expression right, Expression original, This data)
CodeContracts: ClrExtensions40:    at Microsoft.Research.AbstractDomains.GenericExpressionVisitor`4.DispatchCompare(CompareVisitor cmp, Expression left, Expression right, Expression original, In data)
CodeContracts: ClrExtensions40:    at Microsoft.Research.AbstractDomains.GenericExpressionVisitor`4.DispatchVisitNot(Expression exp, In data)
CodeContracts: ClrExtensions40:    at Microsoft.Research.AbstractDomains.GenericExpressionVisitor`4.Visit(Expression exp, In data)
CodeContracts: ClrExtensions40:    at Microsoft.Research.AbstractDomains.Numerical.IntervalEnvironment_Base`5.IntervalsTrueTestVisitor.Visit(Expression exp, This data)
CodeContracts: ClrExtensions40:    at Microsoft.Research.AbstractDomains.Numerical.IntervalEnvironment_Base`5.TestTrue(Expression guard)
CodeContracts: ClrExtensions40:    at Microsoft.Research.AbstractDomains.Numerical.Pentagons`2.TestTrue(Expression guard)
CodeContracts: ClrExtensions40:    at Microsoft.Research.AbstractDomains.Numerical.PentagonsPlus`2.TestTrue(Expression guard)
CodeContracts: ClrExtensions40:    at Microsoft.Research.AbstractDomains.ReducedNumericalDomains`4.TestTrue(Expression guard)
CodeContracts: ClrExtensions40:    at Microsoft.Research.AbstractDomains.Numerical.NumericalDomainWithKarr`2.TestTrue(Expression guard)
CodeContracts: ClrExtensions40:    at Microsoft.Research.AbstractDomains.ReducedNumericalDomains`4.TestTrue(Expression guard)
CodeContracts: ClrExtensions40:    at Microsoft.Research.CodeAnalysis.AnalysisWrapper.TypeBindings`10.AILogicInference`1.CheckIfImplicationHolds(AbstractDomain adomain, FList`1 posAssumptions, FList`1 negAssumptions, BoxedExpression goal)
CodeContracts: ClrExtensions40:    at Microsoft.Research.CodeAnalysis.AnalysisWrapper.TypeBindings`10.AILogicInference`1.IsTrueImply(APC pc, FList`1 posAssumptions, FList`1 negAssumptions, BoxedExpression goal)
CodeContracts: ClrExtensions40:    at Microsoft.Research.CodeAnalysis.ComposedFactQuery`1.IsTrueImply(APC pc, FList`1 posAssumptions, FList`1 negAssumptions, BoxedExpression goal)
CodeContracts: ClrExtensions40:    at Microsoft.Research.CodeAnalysis.WeakestPreconditionProver.TypeBinder`11.Exploration.TryProvingTheImplication(Path head)
CodeContracts: ClrExtensions40:    at Microsoft.Research.CodeAnalysis.WeakestPreconditionProver.TypeBinder`11.Exploration.DischargePath(Path head)
CodeContracts: ClrExtensions40:    at Microsoft.Research.CodeAnalysis.WeakestPreconditionProver.TypeBinder`11.Exploration.ExpandPath(Path head, FList`1& paths)
CodeContracts: ClrExtensions40:    at Microsoft.Research.CodeAnalysis.WeakestPreconditionProver.TypeBinder`11.Exploration.DischargePaths(FList`1 paths)
CodeContracts: ClrExtensions40:    at Microsoft.Research.CodeAnalysis.WeakestPreconditionProver.TypeBinder`11.DischargeObligation(IMethodDriver`12 mdriver, IFactQuery`2 facts, Int32 maxPathSize, APC pc, BoxedExpression goalExpression)
CodeContracts: ClrExtensions40:    at Microsoft.Research.CodeAnalysis.WeakestPreconditionProver.TypeBinder`11.DischargeObligation(IMethodDriver`12 mdriver, IFactQuery`2 facts, Int32 maxPathSize, APC pc, Variable goal)
CodeContracts: ClrExtensions40:    at Microsoft.Research.CodeAnalysis.WeakestPreconditionProver.Discharge[Local,Parameter,Method,Field,Property,Type,Attribute,Assembly,Expression,Variable,LogOptions](APC pc, Variable goal, Int32 maxPathSize, IMethodDriver`12 mdriver, IFactQuery`2 facts)
CodeContracts: ClrExtensions40:    at Microsoft.Research.CodeAnalysis.AssertionFinder.TypeBindings`10.ValidateAssertions(IMethodDriver`12 mdriver, FList`1 results, IOutputResults output, AssertionStatistics& assertStats)
CodeContracts: ClrExtensions40:    at Microsoft.Research.CodeAnalysis.AssertionFinder.ValidateAssertions[Local,Parameter,Method,Field,Property,Type,Attribute,Assembly,Expression,Variable](IMethodDriver`12 driver, FList`1 results, IOutputResults output, AssertionStatistics& assertStats)
CodeContracts: ClrExtensions40:    at Microsoft.Research.CodeAnalysis.Clousot.TypeBinder`8.AnalyzeNonIteratorMethodInternal(Method method)
CodeContracts: ClrExtensions40:    at Microsoft.Research.CodeAnalysis.Clousot.TypeBinder`8.AnalyzeMethodInternal(Method method)
CodeContracts: ClrExtensions40:    at Microsoft.Research.CodeAnalysis.Clousot.TypeBinder`8.AnalyzeMethod(Method method)
CodeContracts: ClrExtensions40:    at Microsoft.Research.CodeAnalysis.Clousot.TypeBinder`8.AnalyzeAssembly(String assemblyName, Set`1 assembliesUnderAnalysis)
CodeContracts: ClrExtensions40:    at Microsoft.Research.CodeAnalysis.Clousot.TypeBinder`8.InternalAnalyze()
CodeContracts: ClrExtensions40:    at Microsoft.Research.CodeAnalysis.Clousot.TypeBinder`8.Analyze()
CodeContracts: ClrExtensions40:
CodeContracts: ClrExtensions40: Background contract analysis done.

解决方案

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