1033   abandon_collection_set(collection_set());
1034 
1035   tear_down_region_sets(false /* free_list_only */);
1036 
1037   hrm()->prepare_for_full_collection_start();
1038 }
1039 
1040 void G1CollectedHeap::verify_before_full_collection(bool explicit_gc) {
1041   assert(!GCCause::is_user_requested_gc(gc_cause()) || explicit_gc, "invariant");
1042   assert_used_and_recalculate_used_equal(this);
1043   _verifier->verify_region_sets_optional();
1044   _verifier->verify_before_gc(G1HeapVerifier::G1VerifyFull);
1045   _verifier->check_bitmaps("Full GC Start");
1046 }
1047 
1048 void G1CollectedHeap::prepare_heap_for_mutators() {
1049   hrm()->prepare_for_full_collection_end();
1050 
1051   // Delete metaspaces for unloaded class loaders and clean up loader_data graph
1052   ClassLoaderDataGraph::purge();
1053   MetaspaceUtils::verify_metrics();
1054 
1055   // Prepare heap for normal collections.
1056   assert(num_free_regions() == 0, "we should not have added any free regions");
1057   rebuild_region_sets(false /* free_list_only */);
1058   abort_refinement();
1059   resize_heap_if_necessary();
1060 
1061   // Rebuild the strong code root lists for each region
1062   rebuild_strong_code_roots();
1063 
1064   // Purge code root memory
1065   purge_code_root_memory();
1066 
1067   // Start a new incremental collection set for the next pause
1068   start_new_collection_set();
1069 
1070   _allocator->init_mutator_alloc_region();
1071 
1072   // Post collection state updates.
1073   MetaspaceGC::compute_new_size();

1033   abandon_collection_set(collection_set());
1034 
1035   tear_down_region_sets(false /* free_list_only */);
1036 
1037   hrm()->prepare_for_full_collection_start();
1038 }
1039 
1040 void G1CollectedHeap::verify_before_full_collection(bool explicit_gc) {
1041   assert(!GCCause::is_user_requested_gc(gc_cause()) || explicit_gc, "invariant");
1042   assert_used_and_recalculate_used_equal(this);
1043   _verifier->verify_region_sets_optional();
1044   _verifier->verify_before_gc(G1HeapVerifier::G1VerifyFull);
1045   _verifier->check_bitmaps("Full GC Start");
1046 }
1047 
1048 void G1CollectedHeap::prepare_heap_for_mutators() {
1049   hrm()->prepare_for_full_collection_end();
1050 
1051   // Delete metaspaces for unloaded class loaders and clean up loader_data graph
1052   ClassLoaderDataGraph::purge();
1053   DEBUG_ONLY(MetaspaceUtils::verify(false);)
1054 
1055   // Prepare heap for normal collections.
1056   assert(num_free_regions() == 0, "we should not have added any free regions");
1057   rebuild_region_sets(false /* free_list_only */);
1058   abort_refinement();
1059   resize_heap_if_necessary();
1060 
1061   // Rebuild the strong code root lists for each region
1062   rebuild_strong_code_roots();
1063 
1064   // Purge code root memory
1065   purge_code_root_memory();
1066 
1067   // Start a new incremental collection set for the next pause
1068   start_new_collection_set();
1069 
1070   _allocator->init_mutator_alloc_region();
1071 
1072   // Post collection state updates.
1073   MetaspaceGC::compute_new_size();