1638 
1639   if (has_overflown()) {
1640     // We can not trust g1_is_alive and the contents of the heap if the marking stack
1641     // overflowed while processing references. Exit the VM.
1642     fatal("Overflow during reference processing, can not continue. Please "
1643           "increase MarkStackSizeMax (current value: " SIZE_FORMAT ") and "
1644           "restart.", MarkStackSizeMax);
1645     return;
1646   }
1647 
1648   assert(_global_mark_stack.is_empty(), "Marking should have completed");
1649 
1650   {
1651     GCTraceTime(Debug, gc, phases) debug("Weak Processing", _gc_timer_cm);
1652     WeakProcessor::weak_oops_do(_g1h->workers(), &g1_is_alive, &do_nothing_cl, 1);
1653   }
1654 
1655   // Unload Klasses, String, Code Cache, etc.
1656   if (ClassUnloadingWithConcurrentMark) {
1657     GCTraceTime(Debug, gc, phases) debug("Class Unloading", _gc_timer_cm);
1658     bool purged_classes = SystemDictionary::do_unloading(_gc_timer_cm, false /* Defer cleaning */);
1659     _g1h->complete_cleaning(&g1_is_alive, purged_classes);
1660   } else {
1661     GCTraceTime(Debug, gc, phases) debug("Cleanup", _gc_timer_cm);
1662     // No need to clean string table as it is treated as strong roots when
1663     // class unloading is disabled.
1664     _g1h->partial_cleaning(&g1_is_alive, false, G1StringDedup::is_enabled());
1665   }
1666 }
1667 
1668 class G1PrecleanYieldClosure : public YieldClosure {
1669   G1ConcurrentMark* _cm;
1670 
1671 public:
1672   G1PrecleanYieldClosure(G1ConcurrentMark* cm) : _cm(cm) { }
1673 
1674   virtual bool should_return() {
1675     return _cm->has_aborted();
1676   }
1677 
1678   virtual bool should_return_fine_grain() {

1638 
1639   if (has_overflown()) {
1640     // We can not trust g1_is_alive and the contents of the heap if the marking stack
1641     // overflowed while processing references. Exit the VM.
1642     fatal("Overflow during reference processing, can not continue. Please "
1643           "increase MarkStackSizeMax (current value: " SIZE_FORMAT ") and "
1644           "restart.", MarkStackSizeMax);
1645     return;
1646   }
1647 
1648   assert(_global_mark_stack.is_empty(), "Marking should have completed");
1649 
1650   {
1651     GCTraceTime(Debug, gc, phases) debug("Weak Processing", _gc_timer_cm);
1652     WeakProcessor::weak_oops_do(_g1h->workers(), &g1_is_alive, &do_nothing_cl, 1);
1653   }
1654 
1655   // Unload Klasses, String, Code Cache, etc.
1656   if (ClassUnloadingWithConcurrentMark) {
1657     GCTraceTime(Debug, gc, phases) debug("Class Unloading", _gc_timer_cm);
1658     bool purged_classes = SystemDictionary::do_unloading(_gc_timer_cm);
1659     _g1h->complete_cleaning(&g1_is_alive, purged_classes);
1660   } else {
1661     GCTraceTime(Debug, gc, phases) debug("Cleanup", _gc_timer_cm);
1662     // No need to clean string table as it is treated as strong roots when
1663     // class unloading is disabled.
1664     _g1h->partial_cleaning(&g1_is_alive, false, G1StringDedup::is_enabled());
1665   }
1666 }
1667 
1668 class G1PrecleanYieldClosure : public YieldClosure {
1669   G1ConcurrentMark* _cm;
1670 
1671 public:
1672   G1PrecleanYieldClosure(G1ConcurrentMark* cm) : _cm(cm) { }
1673 
1674   virtual bool should_return() {
1675     return _cm->has_aborted();
1676   }
1677 
1678   virtual bool should_return_fine_grain() {