protected void updateARG(PredicatePrecision pNewPrecision, ARGState pRefinementRoot)
throws InterruptedException {
argUpdate.start();
List<Precision> precisions = new ArrayList<>(2);
List<Predicate<? super Precision>> precisionTypes = new ArrayList<>(2);
precisions.add(pNewPrecision);
precisionTypes.add(Predicates.instanceOf(PredicatePrecision.class));
UnmodifiableReachedSet unmodifiableReached = reached.asReachedSet();
if (isValuePrecisionAvailable(pRefinementRoot)) {
precisions.add(mergeAllValuePrecisionsFromSubgraph(pRefinementRoot, unmodifiableReached));
precisionTypes.add(VariableTrackingPrecision.isMatchingCPAClass(ValueAnalysisCPA.class));
}
reached.removeSubtree(pRefinementRoot, precisions, precisionTypes);
if (sharePredicates) {
reached.updatePrecisionGlobally(
pNewPrecision, Predicates.instanceOf(PredicatePrecision.class));
}
argUpdate.stop();
}
/**
* After a path was strengthened, we need to take care of the coverage relation. We also remove
* the infeasible part from the ARG, and re-establish the coverage invariant (i.e., that states on
* the path are either covered or cannot be covered).
*/
@Override
protected void finishRefinementOfPath(
ARGState infeasiblePartOfART,
List<ARGState> changedElements,
ARGReachedSet pReached,
boolean pRepeatedCounterexample)
throws CPAException, InterruptedException {
checkState(lastAbstraction != null);
lastAbstraction = null;
stats.argUpdate.start();
for (ARGState w : changedElements) {
pReached.removeCoverageOf(w);
}
pReached.removeInfeasiblePartofARG(infeasiblePartOfART);
stats.argUpdate.stop();
// optimization: instead of closing all ancestors of v,
// close only those that were strengthened during refine
stats.coverTime.start();
try {
for (ARGState w : changedElements) {
if (pReached.tryToCover(w)) {
break; // all further elements are covered anyway
}
}
} finally {
stats.coverTime.stop();
}
}
private boolean isValuePrecisionAvailable(ARGState root) {
if (!reached.asReachedSet().contains(root)) {
return false;
}
return Precisions.extractPrecisionByType(
reached.asReachedSet().getPrecision(root), VariableTrackingPrecision.class)
!= null;
}
private void refineRelevantPredicatesComputer(List<ARGState> pPath, ARGReachedSet pReached) {
UnmodifiableReachedSet reached = pReached.asReachedSet();
Precision oldPrecision = reached.getPrecision(reached.getLastState());
PredicatePrecision oldPredicatePrecision =
Precisions.extractPrecisionByType(oldPrecision, PredicatePrecision.class);
BlockPartitioning partitioning = predicateCpa.getPartitioning();
Deque<Block> openBlocks = new ArrayDeque<>();
openBlocks.push(partitioning.getMainBlock());
for (ARGState pathElement : pPath) {
CFANode currentNode = AbstractStates.extractLocation(pathElement);
Integer currentNodeInstance =
getPredicateState(pathElement).getAbstractionLocationsOnPath().get(currentNode);
if (partitioning.isCallNode(currentNode)) {
openBlocks.push(partitioning.getBlockForCallNode(currentNode));
}
Collection<AbstractionPredicate> localPreds =
oldPredicatePrecision.getPredicates(currentNode, currentNodeInstance);
for (Block block : openBlocks) {
for (AbstractionPredicate pred : localPreds) {
relevantPredicatesComputer.considerPredicateAsRelevant(block, pred);
}
}
while (openBlocks.peek().isReturnNode(currentNode)) {
openBlocks.pop();
}
}
}
protected final PredicatePrecision extractPredicatePrecision(
final ARGReachedSet pReached, ARGState state) {
return (PredicatePrecision)
Precisions.asIterable(pReached.asReachedSet().getPrecision(state))
.filter(Predicates.instanceOf(PredicatePrecision.class))
.get(0);
}
private VariableTrackingPrecision extractValuePrecision(
final ARGReachedSet pReached, ARGState state) {
return (VariableTrackingPrecision)
Precisions.asIterable(pReached.asReachedSet().getPrecision(state))
.filter(VariableTrackingPrecision.isMatchingCPAClass(ValueAnalysisCPA.class))
.get(0);
}
private final PredicatePrecision computeNewPrecision() {
// get previous precision
UnmodifiableReachedSet unmodifiableReached = reached.asReachedSet();
logger.log(Level.FINEST, "Removing everything below", refinementRoot, "from ARG.");
// now create new precision
precisionUpdate.start();
PredicatePrecision basePrecision =
findAllPredicatesFromSubgraph(refinementRoot, unmodifiableReached);
logger.log(Level.ALL, "Old predicate map is", basePrecision);
logger.log(Level.ALL, "New predicates are", newPredicates);
PredicatePrecision newPrecision = basePrecision.addLocalPredicates(newPredicates.entries());
logger.log(Level.ALL, "Predicate map now is", newPrecision);
assert basePrecision.calculateDifferenceTo(newPrecision) == 0
: "We forgot predicates during refinement!";
precisionUpdate.stop();
return newPrecision;
}
/**
* Merge all predicate precisions in the subgraph below the refinement root into a new predicate
* precision
*
* @return a new predicate precision containing all predicate precision from the subgraph below
* the refinement root.
*/
private PredicatePrecision mergePredicatePrecisionsForSubgraph(
final ARGState pRefinementRoot, final ARGReachedSet pReached) {
UnmodifiableReachedSet reached = pReached.asReachedSet();
return PredicatePrecision.unionOf(
from(pRefinementRoot.getSubgraph())
.filter(not(ARGState::isCovered))
.transform(reached::getPrecision));
}
@Override
protected void refineUsingInterpolants(
final ARGReachedSet pReached,
final InterpolationTree<ValueAnalysisState, ValueAnalysisInterpolant> pInterpolationTree)
throws InterruptedException {
final boolean predicatePrecisionIsAvailable = isPredicatePrecisionAvailable(pReached);
Map<ARGState, List<Precision>> refinementInformation = new HashMap<>();
Collection<ARGState> refinementRoots =
pInterpolationTree.obtainRefinementRoots(restartStrategy);
for (ARGState root : refinementRoots) {
shutdownNotifier.shutdownIfNecessary();
root = relocateRefinementRoot(root, predicatePrecisionIsAvailable);
if (refinementRoots.size() == 1
&& isSimilarRepeatedRefinement(
pInterpolationTree.extractPrecisionIncrement(root).values())) {
root = relocateRepeatedRefinementRoot(root);
}
List<Precision> precisions = new ArrayList<>(2);
// merge the value precisions of the subtree, and refine it
precisions.add(
mergeValuePrecisionsForSubgraph(root, pReached)
.withIncrement(pInterpolationTree.extractPrecisionIncrement(root)));
// merge the predicate precisions of the subtree, if available
if (predicatePrecisionIsAvailable) {
precisions.add(mergePredicatePrecisionsForSubgraph(root, pReached));
}
refinementInformation.put(root, precisions);
}
for (Entry<ARGState, List<Precision>> info : refinementInformation.entrySet()) {
shutdownNotifier.shutdownIfNecessary();
List<Predicate<? super Precision>> precisionTypes = new ArrayList<>(2);
precisionTypes.add(VariableTrackingPrecision.isMatchingCPAClass(ValueAnalysisCPA.class));
if (predicatePrecisionIsAvailable) {
precisionTypes.add(Predicates.instanceOf(PredicatePrecision.class));
}
pReached.removeSubtree(info.getKey(), info.getValue(), precisionTypes);
}
}
/**
* After a path was strengthened, we need to take care of the coverage relation. We also remove
* the infeasible part from the ARG, and re-establish the coverage invariant (i.e., that states on
* the path are either covered or cannot be covered).
*/
@Override
protected void finishRefinementOfPath(
ARGState infeasiblePartOfART,
List<ARGState> changedElements,
ARGReachedSet pReached,
boolean pRepeatedCounterexample)
throws CPAException, InterruptedException {
// only thing to do here is adding the false predicate for unreacheable states
newPredicates.put(extractLocation(infeasiblePartOfART), predAbsMgr.makeFalsePredicate());
changedElements.add(infeasiblePartOfART);
if (restartAfterRefinement) {
refinementRoot = (ARGState) reached.asReachedSet().getFirstState();
} else if (refinementRoot == null) {
refinementRoot = changedElements.get(0);
// search parent of both refinement roots and use this as the new
// refinement root
} else {
PathIterator firstPath = ARGUtils.getOnePathTo(refinementRoot).pathIterator();
PathIterator secondPath = ARGUtils.getOnePathTo(changedElements.get(0)).pathIterator();
// TODO should they be equal or identical?
while (firstPath.getAbstractState().equals(secondPath.getAbstractState())) {
refinementRoot = firstPath.getAbstractState();
if (firstPath.hasNext() && secondPath.hasNext()) {
firstPath.advance();
secondPath.advance();
} else {
break;
}
}
}
}
private boolean isPredicatePrecisionAvailable(final ARGReachedSet pReached) {
return Precisions.extractPrecisionByType(
pReached.asReachedSet().getPrecision(pReached.asReachedSet().getFirstState()),
PredicatePrecision.class)
!= null;
}