/// <summary>
/// simplifies the term based on the contents of the term. all
/// </summary>
/// <param name="host"></param>
/// <param name="termManager"></param>
/// <param name="condition"></param>
/// <param name="binOp"></param>
private static Term SimplifyTerm(IPexExplorationComponent host, TermManager termManager, Term condition)
{
Term left, right;
BinaryOperator binOp;
if (!termManager.TryGetBinary(condition, out binOp, out left, out right))
{
return(condition);
}
if (!IsInteger(termManager, left) || !IsInteger(termManager, right))
{
return(condition);
}
//Check whether the term is of the form x > 20, where one side is a constant. then no simplification needs to be done
if (termManager.IsValue(left))
{
//one side is constant. so just return over here
return(condition);
}
if (termManager.IsValue(right))
{
//one side is constant. so just return over here
return(condition);
}
//none of the sides are concrete. both sides are symbolic.
//find out which side can be more controlled based on the variables
//contained on that side
SafeList <Field> allFieldsInLeftCondition = new SafeList <Field>();
SafeList <TypeEx> allFieldTypes = new SafeList <TypeEx>();
SafeDictionary <Field, FieldValueHolder> leftfields = new SafeDictionary <Field, FieldValueHolder>();
VariablesCollector.Collect(termManager, left, leftfields, allFieldsInLeftCondition, allFieldTypes);
//TODO: How to get the concrete value of the other side, could be either left
//or right. and make a term out of the concrete value
int lvalue;
if (termManager.TryGetI4Constant(left, out lvalue))
{
}
int rvalue;
if (termManager.TryGetI4Constant(right, out rvalue))
{
}
return(condition);
}
private void GatherDebuggingInfoFromInsufficiency(IExecutionNode executionNode, TermManager termManager,
Term condition, TypeEx explorableType)
{
var sb = new SafeStringBuilder();
sb.AppendLine("condition:");
sb.AppendLine();
this.tba.ConvertTermToText(new SafeStringWriter(sb), condition, this.ExplorationServices.TermManager);
sb.AppendLine();
var swriter = new TermSExpWriter(termManager, new SafeStringWriter(sb), true, false);
swriter.Write(condition);
sb.AppendLine();
sb.AppendLine("location:");
sb.AppendLine();
sb.AppendLine(executionNode.CodeLocation.ToString());
sb.AppendLine();
sb.AppendLine("properties:");
Term unnegatedCondition;
if (termManager.TryGetInnerLogicallyNegatedValue(condition, out unnegatedCondition))
{
sb.AppendLine("negated");
}
else
{
unnegatedCondition = condition;
}
var targetFieldValues = new SafeDictionary <Field, object>();
Term left, right;
BinaryOperator binOp;
if (termManager.TryGetBinary(unnegatedCondition, out binOp, out left, out right))
{
sb.AppendFormat("binary relation: {0}", binOp);
sb.AppendLine();
if (!termManager.IsValue(left) && !termManager.IsValue(right))
{
sb.AppendLine("No constant on either left side or right side.");
return;
}
Term non_constant_term = null;
Term constant_term = null;
if (termManager.IsValue(left))
{
non_constant_term = right;
constant_term = left;
}
else if (termManager.IsValue(right))
{
non_constant_term = left;
constant_term = right;
}
sb.AppendLine("against constant");
if (constant_term == null || termManager.IsDefaultValue(constant_term))
{
sb.AppendLine("against default value ('null' for references)");
}
int value;
if (constant_term != null && termManager.TryGetI4Constant(constant_term, out value))
{
sb.AppendLine("against integer: " + value);
}
Term objectValue;
ObjectProperty objectProperty;
if (constant_term != null && termManager.TryGetObjectProperty(constant_term, out objectValue, out objectProperty))
{
sb.AppendLine("against object property: object=" + objectValue + ", property=" + objectProperty);
}
sb.AppendLine(" involving fields: ");
SafeDictionary <Field, FieldValueHolder> innerFieldValues;
SafeList <TypeEx> innerFieldTypes;
SafeList <Field> fs = TargetBranchAnalyzer.GetInvolvedFields(this, termManager,
non_constant_term, out innerFieldValues, out innerFieldTypes);
foreach (var f in fs)
{
sb.AppendLine(f.FullName);
}
}
sb.AppendLine("Executed method call sequence");
if (this.pmd.LastExecutedFactoryMethodCallSequence != null)
{
foreach (var m in this.pmd.LastExecutedFactoryMethodCallSequence)
{
sb.AppendLine("\t" + m);
}
}
this.Log.Dump("foo", "insufficiency for " + (explorableType != null ? explorableType.FullName : "?"), sb.ToString());
return;
}
/// <summary>
/// Gets called when an un-explored branch is encountered during program execution
/// </summary>
/// <param name="executionNode"></param>
/// <param name="explorableType"></param>
public void HandleTargetBranch(CodeLocation location, Term condition, TermManager termManager, TypeEx explorableType)
{
var accessedFields = new SafeList <Field>();
if (PexMeConstants.IGNORE_UNCOV_BRANCH_IN_SYSTEM_LIB)
{
if (IsUncoveredLocationInSystemLib(location))
{
this.host.Log.LogWarning(WikiTopics.MissingWikiTopic, "uncoveredlocation",
"Ignoring the uncovered location " + location.ToString() + ", since it is in system library");
return;
}
}
Term unnegatedCondition;
bool bNegated = false;
if (termManager.TryGetInnerLogicallyNegatedValue(condition, out unnegatedCondition))
{
bNegated = true;
}
else
{
unnegatedCondition = condition;
}
var culpritFields = new SafeList <Field>();
Term left, right;
BinaryOperator binOp;
SafeStringBuilder sbTerm = new SafeStringBuilder();
this.ConvertTermToText(new SafeStringWriter(sbTerm), condition, termManager);
//Handling only binary conditions. TODO: Needs to check what are the other conditions
//The related code is in TermSolver function
if (!termManager.TryGetBinary(unnegatedCondition, out binOp, out left, out right))
{
this.host.Log.LogWarning(WikiTopics.MissingWikiTopic, PexMeLogCategories.Term,
"Handling only binary operations in terms");
return;
}
if (PexMeConstants.USE_TERM_SOLVER)
{
//TODO: Temporarily ignoring the scenario where both the sides are symbolic values
if (!termManager.IsValue(left) && !termManager.IsValue(right))
{
this.host.Log.LogWarning(WikiTopics.MissingWikiTopic, PexMeLogCategories.Term,
"Handling only binary operations where atleast one side of the condition is concrete. Current expression has both sides symbolic");
return;
}
SafeDictionary <Field, FieldValueHolder> expectedFieldValues;
SafeDictionary <Field, FieldValueHolder> actualFieldValues;
SafeList <Field> allFieldsInCondition;
SafeList <TypeEx> allFieldTypes;
TermSolver.SolveTerm(this.explorationComponent, condition, binOp,
out actualFieldValues, out expectedFieldValues, out allFieldsInCondition, out allFieldTypes);
//Compute an intersection to identify culprit fields
List <Field> actualKeys = actualFieldValues.Keys.ToList();
List <Field> expectedKeys = expectedFieldValues.Keys.ToList();
AddToCulpritField(allFieldsInCondition, culpritFields);
if (culpritFields.Count == 0)
{
this.host.Log.LogWarning(WikiTopics.MissingWikiTopic, PexMeLogCategories.Term,
"Failed to retrieve culprit fields from the uncovered branch");
}
else
{
foreach (Field field in culpritFields)
{
FieldModificationType fieldfmt;
int fitnessval;
FitnessMeasure.ComputeFitnessValue(field, actualFieldValues[field], expectedFieldValues[field], this.host, out fieldfmt, out fitnessval);
if (fieldfmt == FieldModificationType.UNKNOWN)
{
continue;
}
this.pmd.AddFieldsOfUncoveredCodeLocations(location, allFieldsInCondition, fieldfmt,
condition, sbTerm.ToString(), fitnessval, explorableType, allFieldTypes);
}
}
}
else
{
FieldModificationType fmt;
if (!termManager.IsValue(left) && !termManager.IsValue(right))
{
SafeDictionary <Field, FieldValueHolder> leftFieldValues;
SafeList <TypeEx> leftFieldTypes;
var leftAccessedFields = GetInvolvedFields(this.host, termManager, left, out leftFieldValues, out leftFieldTypes);
if (leftAccessedFields.Count > 0)
{
AddToCulpritField(leftAccessedFields, culpritFields);
}
SafeDictionary <Field, FieldValueHolder> rightFieldValues;
SafeList <TypeEx> rightFieldTypes;
var rightAccessedFields = GetInvolvedFields(this.host, termManager, right, out rightFieldValues, out rightFieldTypes);
if (rightAccessedFields.Count > 0)
{
AddToCulpritField(rightAccessedFields, culpritFields);
}
int fitnessval;
this.handleNoConstantsInTerm(termManager, left, right, binOp, bNegated,
culpritFields, unnegatedCondition, out fmt, out fitnessval);
//TODO: fitnessval can be different from left and right handside terms. Needs to deal with this later
this.pmd.AddFieldsOfUncoveredCodeLocations(location, leftAccessedFields,
fmt, condition, sbTerm.ToString(), fitnessval, explorableType, leftFieldTypes);
this.pmd.AddFieldsOfUncoveredCodeLocations(location, rightAccessedFields,
fmt, condition, sbTerm.ToString(), fitnessval, explorableType, rightFieldTypes);
}
else
{
Term non_constant_term = null;
if (termManager.IsValue(left))
{
non_constant_term = right;
}
else if (termManager.IsValue(right))
{
non_constant_term = left;
}
else
{
SafeDebug.AssumeNotNull(null, "Control should not come here!!!");
}
//Get accessed fields in the uncovered branching condition
SafeDictionary <Field, FieldValueHolder> fieldValues;
SafeList <TypeEx> fieldTypes;
accessedFields = GetInvolvedFields(this.host, termManager, non_constant_term, out fieldValues, out fieldTypes);
if (accessedFields.Count != 0)
{
AddToCulpritField(accessedFields, culpritFields);
}
if (culpritFields.Count == 0)
{
this.host.Log.LogWarning(WikiTopics.MissingWikiTopic, PexMeLogCategories.Term,
"Failed to retrieve culprit fields from the uncovered branch");
}
else
{
int fitnessval;
this.handleAConstantInTerm(termManager, left, right, binOp, bNegated, fieldValues, culpritFields[0], out fmt, out fitnessval);
this.pmd.AddFieldsOfUncoveredCodeLocations(location, accessedFields,
fmt, condition, sbTerm.ToString(), fitnessval, explorableType, fieldTypes);
}
}
}
}
/// <summary>
/// OBSOLETE: Handles a scenario where there is a term in the condition
/// </summary>
/// <param name="left"></param>
/// <param name="right"></param>
/// <param name="binOp"></param>
/// <param name="fmt"></param>
private void handleAConstantInTerm(TermManager termManager, Term left, Term right,
BinaryOperator binOp, bool bNegated, SafeDictionary <Field, FieldValueHolder> fieldValues, Field culpritField,
out FieldModificationType fmt, out int fitnessval)
{
fitnessval = Int32.MaxValue;
fmt = FieldModificationType.UNKNOWN;
Term non_constant_term = null;
Term constant_term = null;
bool bleftRightMaintainted = true;
if (termManager.IsValue(left))
{
non_constant_term = right;
constant_term = left;
bleftRightMaintainted = true;
}
else if (termManager.IsValue(right))
{
non_constant_term = left;
constant_term = right;
bleftRightMaintainted = false;
}
int value;
if (termManager.TryGetI4Constant(constant_term, out value))
{
fmt = FieldModificationType.INCREMENT;
FieldValueHolder fvh;
if (fieldValues.TryGetValue(culpritField, out fvh))
{
int non_constant_field_value = fvh.intValue; //TODO: Assuming that the fieldType is Int32
if (bleftRightMaintainted)
{
fitnessval = FitnessMeasure.ComputeFitnessValue(this.host, binOp, value, non_constant_field_value, bNegated);
}
else
{
fitnessval = FitnessMeasure.ComputeFitnessValue(this.host, binOp, non_constant_field_value, value, bNegated);
}
}
else
{
this.host.Log.LogWarning(WikiTopics.MissingWikiTopic, "fitness measure",
"Failed to retrieve value for field " + culpritField.ToString());
}
}
else if (termManager.IsDefaultValue(constant_term))
{
if (binOp == BinaryOperator.Ceq)
{
if (culpritField.Type.ToString() == "System.Boolean")
{
fmt = bNegated ? FieldModificationType.TRUE_SET : FieldModificationType.FALSE_SET;
}
else
{
fmt = bNegated ? FieldModificationType.NON_NULL_SET : FieldModificationType.NULL_SET;
}
}
}
Term objectValue;
ObjectProperty objectProperty;
if (termManager.TryGetObjectProperty(constant_term, out objectValue, out objectProperty))
{
//TODO??? How to handle this scenario?
}
}
private void GatherDebuggingInfoFromInsufficiency(IExecutionNode executionNode, TermManager termManager,
Term condition, TypeEx explorableType)
{
var sb = new SafeStringBuilder();
sb.AppendLine("condition:");
sb.AppendLine();
this.tba.ConvertTermToText(new SafeStringWriter(sb), condition, this.ExplorationServices.TermManager);
sb.AppendLine();
var swriter = new TermSExpWriter(termManager, new SafeStringWriter(sb), true, false);
swriter.Write(condition);
sb.AppendLine();
sb.AppendLine("location:");
sb.AppendLine();
sb.AppendLine(executionNode.CodeLocation.ToString());
sb.AppendLine();
sb.AppendLine("properties:");
Term unnegatedCondition;
if (termManager.TryGetInnerLogicallyNegatedValue(condition, out unnegatedCondition))
sb.AppendLine("negated");
else
unnegatedCondition = condition;
var targetFieldValues = new SafeDictionary<Field, object>();
Term left, right;
BinaryOperator binOp;
if (termManager.TryGetBinary(unnegatedCondition, out binOp, out left, out right))
{
sb.AppendFormat("binary relation: {0}", binOp);
sb.AppendLine();
if (!termManager.IsValue(left) && !termManager.IsValue(right))
{
sb.AppendLine("No constant on either left side or right side.");
return;
}
Term non_constant_term = null;
Term constant_term = null;
if (termManager.IsValue(left))
{
non_constant_term = right;
constant_term = left;
}
else if (termManager.IsValue(right))
{
non_constant_term = left;
constant_term = right;
}
sb.AppendLine("against constant");
if (constant_term == null || termManager.IsDefaultValue(constant_term))
{
sb.AppendLine("against default value ('null' for references)");
}
int value;
if (constant_term != null && termManager.TryGetI4Constant(constant_term, out value))
{
sb.AppendLine("against integer: " + value);
}
Term objectValue;
ObjectProperty objectProperty;
if (constant_term != null && termManager.TryGetObjectProperty(constant_term, out objectValue, out objectProperty))
{
sb.AppendLine("against object property: object=" + objectValue + ", property=" + objectProperty);
}
sb.AppendLine(" involving fields: ");
SafeDictionary<Field, FieldValueHolder> innerFieldValues;
SafeList<TypeEx> innerFieldTypes;
SafeList<Field> fs = TargetBranchAnalyzer.GetInvolvedFields(this, termManager,
non_constant_term, out innerFieldValues, out innerFieldTypes);
foreach (var f in fs)
{
sb.AppendLine(f.FullName);
}
}
sb.AppendLine("Executed method call sequence");
if(this.pmd.LastExecutedFactoryMethodCallSequence != null)
foreach (var m in this.pmd.LastExecutedFactoryMethodCallSequence)
{
sb.AppendLine("\t" + m);
}
this.Log.Dump("foo", "insufficiency for " + (explorableType != null ? explorableType.FullName : "?"), sb.ToString());
return;
}
/// <summary>
/// OBSOLETE: Handles a scenario where there is a term in the condition
/// </summary>
/// <param name="left"></param>
/// <param name="right"></param>
/// <param name="binOp"></param>
/// <param name="fmt"></param>
private void handleAConstantInTerm(TermManager termManager, Term left, Term right,
BinaryOperator binOp, bool bNegated, SafeDictionary<Field, FieldValueHolder> fieldValues, Field culpritField,
out FieldModificationType fmt, out int fitnessval)
{
fitnessval = Int32.MaxValue;
fmt = FieldModificationType.UNKNOWN;
Term non_constant_term = null;
Term constant_term = null;
bool bleftRightMaintainted = true;
if (termManager.IsValue(left))
{
non_constant_term = right;
constant_term = left;
bleftRightMaintainted = true;
}
else if (termManager.IsValue(right))
{
non_constant_term = left;
constant_term = right;
bleftRightMaintainted = false;
}
int value;
if (termManager.TryGetI4Constant(constant_term, out value))
{
fmt = FieldModificationType.INCREMENT;
FieldValueHolder fvh;
if (fieldValues.TryGetValue(culpritField, out fvh))
{
int non_constant_field_value = fvh.intValue; //TODO: Assuming that the fieldType is Int32
if (bleftRightMaintainted)
fitnessval = FitnessMeasure.ComputeFitnessValue(this.host, binOp, value, non_constant_field_value, bNegated);
else
fitnessval = FitnessMeasure.ComputeFitnessValue(this.host, binOp, non_constant_field_value, value, bNegated);
}
else
this.host.Log.LogWarning(WikiTopics.MissingWikiTopic, "fitness measure",
"Failed to retrieve value for field " + culpritField.ToString());
}
else if (termManager.IsDefaultValue(constant_term))
{
if (binOp == BinaryOperator.Ceq)
{
if (culpritField.Type.ToString() == "System.Boolean")
{
fmt = bNegated ? FieldModificationType.TRUE_SET : FieldModificationType.FALSE_SET;
}
else
fmt = bNegated ? FieldModificationType.NON_NULL_SET : FieldModificationType.NULL_SET;
}
}
Term objectValue;
ObjectProperty objectProperty;
if (termManager.TryGetObjectProperty(constant_term, out objectValue, out objectProperty))
{
//TODO??? How to handle this scenario?
}
}
/// <summary>
/// Gets called when an un-explored branch is encountered during program execution
/// </summary>
/// <param name="executionNode"></param>
/// <param name="explorableType"></param>
public void HandleTargetBranch(CodeLocation location, Term condition, TermManager termManager, TypeEx explorableType)
{
var accessedFields = new SafeList<Field>();
if (PexMeConstants.IGNORE_UNCOV_BRANCH_IN_SYSTEM_LIB)
{
if(IsUncoveredLocationInSystemLib(location))
{
this.host.Log.LogWarning(WikiTopics.MissingWikiTopic, "uncoveredlocation",
"Ignoring the uncovered location " + location.ToString() + ", since it is in system library");
return;
}
}
Term unnegatedCondition;
bool bNegated = false;
if (termManager.TryGetInnerLogicallyNegatedValue(condition, out unnegatedCondition))
bNegated = true;
else
unnegatedCondition = condition;
var culpritFields = new SafeList<Field>();
Term left, right;
BinaryOperator binOp;
SafeStringBuilder sbTerm = new SafeStringBuilder();
this.ConvertTermToText(new SafeStringWriter(sbTerm), condition, termManager);
//Handling only binary conditions. TODO: Needs to check what are the other conditions
//The related code is in TermSolver function
if (!termManager.TryGetBinary(unnegatedCondition, out binOp, out left, out right))
{
this.host.Log.LogWarning(WikiTopics.MissingWikiTopic, PexMeLogCategories.Term,
"Handling only binary operations in terms");
return;
}
if (PexMeConstants.USE_TERM_SOLVER)
{
//TODO: Temporarily ignoring the scenario where both the sides are symbolic values
if (!termManager.IsValue(left) && !termManager.IsValue(right))
{
this.host.Log.LogWarning(WikiTopics.MissingWikiTopic, PexMeLogCategories.Term,
"Handling only binary operations where atleast one side of the condition is concrete. Current expression has both sides symbolic");
return;
}
SafeDictionary<Field, FieldValueHolder> expectedFieldValues;
SafeDictionary<Field, FieldValueHolder> actualFieldValues;
SafeList<Field> allFieldsInCondition;
SafeList<TypeEx> allFieldTypes;
TermSolver.SolveTerm(this.explorationComponent, condition, binOp,
out actualFieldValues, out expectedFieldValues, out allFieldsInCondition, out allFieldTypes);
//Compute an intersection to identify culprit fields
List<Field> actualKeys = actualFieldValues.Keys.ToList();
List<Field> expectedKeys = expectedFieldValues.Keys.ToList();
AddToCulpritField(allFieldsInCondition, culpritFields);
if (culpritFields.Count == 0)
{
this.host.Log.LogWarning(WikiTopics.MissingWikiTopic, PexMeLogCategories.Term,
"Failed to retrieve culprit fields from the uncovered branch");
}
else
{
foreach (Field field in culpritFields)
{
FieldModificationType fieldfmt;
int fitnessval;
FitnessMeasure.ComputeFitnessValue(field, actualFieldValues[field], expectedFieldValues[field], this.host, out fieldfmt, out fitnessval);
if (fieldfmt == FieldModificationType.UNKNOWN)
continue;
this.pmd.AddFieldsOfUncoveredCodeLocations(location, allFieldsInCondition, fieldfmt,
condition, sbTerm.ToString(), fitnessval, explorableType, allFieldTypes);
}
}
}
else
{
FieldModificationType fmt;
if (!termManager.IsValue(left) && !termManager.IsValue(right))
{
SafeDictionary<Field, FieldValueHolder> leftFieldValues;
SafeList<TypeEx> leftFieldTypes;
var leftAccessedFields = GetInvolvedFields(this.host, termManager, left, out leftFieldValues, out leftFieldTypes);
if (leftAccessedFields.Count > 0)
AddToCulpritField(leftAccessedFields, culpritFields);
SafeDictionary<Field, FieldValueHolder> rightFieldValues;
SafeList<TypeEx> rightFieldTypes;
var rightAccessedFields = GetInvolvedFields(this.host, termManager, right, out rightFieldValues, out rightFieldTypes);
if (rightAccessedFields.Count > 0)
AddToCulpritField(rightAccessedFields, culpritFields);
int fitnessval;
this.handleNoConstantsInTerm(termManager, left, right, binOp, bNegated,
culpritFields, unnegatedCondition, out fmt, out fitnessval);
//TODO: fitnessval can be different from left and right handside terms. Needs to deal with this later
this.pmd.AddFieldsOfUncoveredCodeLocations(location, leftAccessedFields,
fmt, condition, sbTerm.ToString(), fitnessval, explorableType, leftFieldTypes);
this.pmd.AddFieldsOfUncoveredCodeLocations(location, rightAccessedFields,
fmt, condition, sbTerm.ToString(), fitnessval, explorableType, rightFieldTypes);
}
else
{
Term non_constant_term = null;
if (termManager.IsValue(left))
non_constant_term = right;
else if (termManager.IsValue(right))
non_constant_term = left;
else
SafeDebug.AssumeNotNull(null, "Control should not come here!!!");
//Get accessed fields in the uncovered branching condition
SafeDictionary<Field, FieldValueHolder> fieldValues;
SafeList<TypeEx> fieldTypes;
accessedFields = GetInvolvedFields(this.host, termManager, non_constant_term, out fieldValues, out fieldTypes);
if (accessedFields.Count != 0)
AddToCulpritField(accessedFields, culpritFields);
if (culpritFields.Count == 0)
{
this.host.Log.LogWarning(WikiTopics.MissingWikiTopic, PexMeLogCategories.Term,
"Failed to retrieve culprit fields from the uncovered branch");
}
else
{
int fitnessval;
this.handleAConstantInTerm(termManager, left, right, binOp, bNegated, fieldValues, culpritFields[0], out fmt, out fitnessval);
this.pmd.AddFieldsOfUncoveredCodeLocations(location, accessedFields,
fmt, condition, sbTerm.ToString(), fitnessval, explorableType, fieldTypes);
}
}
}
}
