629          "save marks have not been newly set.");
 630 
 631   {
 632     // DefNew needs to run with n_threads == 0, to make sure the serial
 633     // version of the card table scanning code is used.
 634     // See: CardTableRS::non_clean_card_iterate_possibly_parallel.
 635     StrongRootsScope srs(0);
 636 
 637     gch->young_process_roots(&srs,
 638                              &fsc_with_no_gc_barrier,
 639                              &fsc_with_gc_barrier,
 640                              &cld_scan_closure);
 641   }
 642 
 643   // "evacuate followers".
 644   evacuate_followers.do_void();
 645 
 646   FastKeepAliveClosure keep_alive(this, &scan_weak_ref);
 647   ReferenceProcessor* rp = ref_processor();
 648   rp->setup_policy(clear_all_soft_refs);
 649   ReferenceProcessorPhaseTimes pt(_gc_timer, rp->num_q());
 650   const ReferenceProcessorStats& stats =
 651   rp->process_discovered_references(&is_alive, &keep_alive, &evacuate_followers,
 652                                     NULL, &pt);
 653   gc_tracer.report_gc_reference_stats(stats);
 654   gc_tracer.report_tenuring_threshold(tenuring_threshold());
 655   pt.print_all_references();
 656 
 657   assert(gch->no_allocs_since_save_marks(), "save marks have not been newly set.");
 658 
 659   WeakProcessor::weak_oops_do(&is_alive, &keep_alive);
 660 
 661   // Verify that the usage of keep_alive didn't copy any objects.
 662   assert(gch->no_allocs_since_save_marks(), "save marks have not been newly set.");
 663 
 664   if (!_promotion_failed) {
 665     // Swap the survivor spaces.
 666     eden()->clear(SpaceDecorator::Mangle);
 667     from()->clear(SpaceDecorator::Mangle);
 668     if (ZapUnusedHeapArea) {
 669       // This is now done here because of the piece-meal mangling which

 629          "save marks have not been newly set.");
 630 
 631   {
 632     // DefNew needs to run with n_threads == 0, to make sure the serial
 633     // version of the card table scanning code is used.
 634     // See: CardTableRS::non_clean_card_iterate_possibly_parallel.
 635     StrongRootsScope srs(0);
 636 
 637     gch->young_process_roots(&srs,
 638                              &fsc_with_no_gc_barrier,
 639                              &fsc_with_gc_barrier,
 640                              &cld_scan_closure);
 641   }
 642 
 643   // "evacuate followers".
 644   evacuate_followers.do_void();
 645 
 646   FastKeepAliveClosure keep_alive(this, &scan_weak_ref);
 647   ReferenceProcessor* rp = ref_processor();
 648   rp->setup_policy(clear_all_soft_refs);
 649   ReferenceProcessorPhaseTimes pt(_gc_timer, rp->num_queues());
 650   const ReferenceProcessorStats& stats =
 651   rp->process_discovered_references(&is_alive, &keep_alive, &evacuate_followers,
 652                                     NULL, &pt);
 653   gc_tracer.report_gc_reference_stats(stats);
 654   gc_tracer.report_tenuring_threshold(tenuring_threshold());
 655   pt.print_all_references();
 656 
 657   assert(gch->no_allocs_since_save_marks(), "save marks have not been newly set.");
 658 
 659   WeakProcessor::weak_oops_do(&is_alive, &keep_alive);
 660 
 661   // Verify that the usage of keep_alive didn't copy any objects.
 662   assert(gch->no_allocs_since_save_marks(), "save marks have not been newly set.");
 663 
 664   if (!_promotion_failed) {
 665     // Swap the survivor spaces.
 666     eden()->clear(SpaceDecorator::Mangle);
 667     from()->clear(SpaceDecorator::Mangle);
 668     if (ZapUnusedHeapArea) {
 669       // This is now done here because of the piece-meal mangling which