private void continueTraversal(int pValue, SMGSingleLinkedListCandidate pCandidate) {
SMGEdgePointsTo pt = smg.getPointer(pValue);
SMGObject object = pt.getObject();
if (!candidates.containsKey(object)) {
startTraversal(object);
}
if (inboundPointers.get(pValue) > 1) {
return;
}
Map<Integer, SMGSingleLinkedListCandidate> objectCandidates = candidates.get(object);
Integer offset = pCandidate.getOffset();
if (!objectCandidates.containsKey(offset)) {
// try to infer a pointer presence: either NULL, or uninitialized
if (smg.isCoveredByNullifiedBlocks(object, offset, AnonymousTypes.dummyPointer)) {
objectCandidates.put(offset, new SMGSingleLinkedListCandidate(object, offset, 1));
}
}
if (objectCandidates.containsKey(offset)) {
SMGSingleLinkedListCandidate myCandidate = objectCandidates.get(offset);
if (pCandidate.isCompatibleWith(myCandidate)) {
objectCandidates.remove(offset);
pCandidate.addLength(myCandidate.getLength());
}
}
}
@Test
public void simpleListTest() {
CLangSMG smg = new CLangSMG(MachineModel.LINUX64);
SMGEdgeHasValue root = TestHelpers.createGlobalList(smg, 5, 16, 8, "pointer");
SMGSingleLinkedListFinder finder = new SMGSingleLinkedListFinder(1);
Set<SMGAbstractionCandidate> candidates = finder.traverse(smg);
Assert.assertEquals(1, candidates.size());
SMGAbstractionCandidate candidate = Iterables.getOnlyElement(candidates);
Assert.assertTrue(candidate instanceof SMGSingleLinkedListCandidate);
SMGSingleLinkedListCandidate sllCandidate = (SMGSingleLinkedListCandidate) candidate;
Assert.assertEquals(5, sllCandidate.getLength());
Assert.assertEquals(8, sllCandidate.getOffset());
SMGRegion expectedStart = (SMGRegion) smg.getPointer(root.getValue()).getObject();
Assert.assertSame(expectedStart, sllCandidate.getStart());
}
