void (DominatorTreeExceptionFilter filter) { for (Integer head : new HashSet<>(mapExtPostdominators.keySet())) { FastFixedSet<Integer> set = mapExtPostdominators.get(head); for (Iterator<Integer> it = set.iterator(); it.hasNext(); ) { if (!filter.acceptStatementPair(head, it.next())) { it.remove(); } } if (set.isEmpty()) { mapExtPostdominators.remove(head); } } }