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src/hotspot/share/gc/shared/referenceProcessor.cpp

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rev 49890 : imported patch 8201492-properly-implement-non-contiguous-reference-processing
rev 49893 : imported patch 8202021-cleanup-referenceprocessor
rev 49894 : imported patch 8202021-stefanj-review
rev 49895 : imported patch 8202017-reference-processor-remove-enqueue
rev 49896 : imported patch 8202017-kim-review
rev 49897 : [mq]: 8201491-precleaning


 595                     DiscoveredList                refs_lists[],
 596                     bool                         clear_referent,
 597                     bool                          marks_oops_alive,
 598                     ReferenceProcessorPhaseTimes* phase_times)
 599     : ProcessTask(ref_processor, refs_lists, marks_oops_alive, phase_times),
 600       _clear_referent(clear_referent)
 601   { }
 602   virtual void work(unsigned int i, BoolObjectClosure& is_alive,
 603                     OopClosure& keep_alive,
 604                     VoidClosure& complete_gc)
 605   {
 606     RefProcWorkerTimeTracker tt(ReferenceProcessorPhaseTimes::RefPhase3, _phase_times, i);
 607 
 608     _ref_processor.process_phase3(_refs_lists[i], _clear_referent,
 609                                   &is_alive, &keep_alive, &complete_gc);
 610   }
 611 private:
 612   bool _clear_referent;
 613 };
 614 


















 615 #ifndef PRODUCT
 616 void ReferenceProcessor::log_reflist_counts(DiscoveredList ref_lists[], uint active_length, size_t total_refs) {
 617   if (!log_is_enabled(Trace, gc, ref)) {
 618     return;
 619   }
 620 
 621   stringStream st;
 622   for (uint i = 0; i < active_length; ++i) {
 623     st.print(SIZE_FORMAT " ", ref_lists[i].length());
 624   }
 625   log_develop_trace(gc, ref)("%s= " SIZE_FORMAT, st.as_string(), total_refs);
 626 #ifdef ASSERT
 627   for (uint i = active_length; i < _max_num_queues; i++) {
 628     assert(ref_lists[i].length() == 0, SIZE_FORMAT " unexpected References in %u",
 629            ref_lists[i].length(), i);
 630   }
 631 #endif
 632 }
 633 #endif
 634 
 635 void ReferenceProcessor::set_active_mt_degree(uint v) {
 636   _num_queues = v;
 637   _next_id = 0;
 638 }
 639 
 640 // Balances reference queues.
 641 // Move entries from all queues[0, 1, ..., _max_num_q-1] to
 642 // queues[0, 1, ..., _num_q-1] because only the first _num_q
 643 // corresponding to the active workers will be processed.
 644 void ReferenceProcessor::balance_queues(DiscoveredList ref_lists[])
 645 {
 646   // calculate total length
 647   size_t total_refs = 0;
 648   log_develop_trace(gc, ref)("Balance ref_lists ");
 649 


 650   for (uint i = 0; i < _max_num_queues; ++i) {
 651     total_refs += ref_lists[i].length();
 652   }
 653   log_reflist_counts(ref_lists, _max_num_queues, total_refs);
 654   size_t avg_refs = total_refs / _num_queues + 1;
 655   uint to_idx = 0;
 656   for (uint from_idx = 0; from_idx < _max_num_queues; from_idx++) {
 657     bool move_all = false;
 658     if (from_idx >= _num_queues) {
 659       move_all = ref_lists[from_idx].length() > 0;
 660     }
 661     while ((ref_lists[from_idx].length() > avg_refs) ||
 662            move_all) {
 663       assert(to_idx < _num_queues, "Sanity Check!");
 664       if (ref_lists[to_idx].length() < avg_refs) {
 665         // move superfluous refs
 666         size_t refs_to_move;
 667         // Move all the Ref's if the from queue will not be processed.
 668         if (move_all) {
 669           refs_to_move = MIN2(ref_lists[from_idx].length(),
 670                               avg_refs - ref_lists[to_idx].length());
 671         } else {
 672           refs_to_move = MIN2(ref_lists[from_idx].length() - avg_refs,
 673                               avg_refs - ref_lists[to_idx].length());


 694         ref_lists[to_idx].set_head(move_head);
 695         ref_lists[to_idx].inc_length(refs_to_move);
 696 
 697         // Remove the chain from the from list.
 698         if (move_tail == new_head) {
 699           // We found the end of the from list.
 700           ref_lists[from_idx].set_head(NULL);
 701         } else {
 702           ref_lists[from_idx].set_head(new_head);
 703         }
 704         ref_lists[from_idx].dec_length(refs_to_move);
 705         if (ref_lists[from_idx].length() == 0) {
 706           break;
 707         }
 708       } else {
 709         to_idx = (to_idx + 1) % _num_queues;
 710       }
 711     }
 712   }
 713 #ifdef ASSERT

 714   size_t balanced_total_refs = 0;
 715   for (uint i = 0; i < _num_queues; ++i) {
 716     balanced_total_refs += ref_lists[i].length();
 717   }
 718   log_reflist_counts(ref_lists, _num_queues, balanced_total_refs);
 719   assert(total_refs == balanced_total_refs, "Balancing was incomplete");
 720 #endif
 721 }
 722 
 723 void ReferenceProcessor::process_discovered_reflist(
 724   DiscoveredList                refs_lists[],
 725   ReferencePolicy*              policy,
 726   bool                          clear_referent,
 727   BoolObjectClosure*            is_alive,
 728   OopClosure*                   keep_alive,
 729   VoidClosure*                  complete_gc,
 730   AbstractRefProcTaskExecutor*  task_executor,
 731   ReferenceProcessorPhaseTimes* phase_times)
 732 {
 733   bool mt_processing = task_executor != NULL && _processing_is_mt;
 734 
 735   phase_times->set_processing_is_mt(mt_processing);
 736 
 737   if (mt_processing && ParallelRefProcBalancingEnabled) {
 738     RefProcBalanceQueuesTimeTracker tt(phase_times);


1013     RawAccess<>::oop_store(discovered_addr, next_discovered);
1014     list->set_head(obj);
1015     list->inc_length(1);
1016 
1017     log_develop_trace(gc, ref)("Discovered reference (" INTPTR_FORMAT ": %s)", p2i(obj), obj->klass()->internal_name());
1018   }
1019   assert(oopDesc::is_oop(obj), "Discovered a bad reference");
1020   verify_referent(obj);
1021   return true;
1022 }
1023 
1024 bool ReferenceProcessor::has_discovered_references() {
1025   for (uint i = 0; i < _max_num_queues * number_of_subclasses_of_ref(); i++) {
1026     if (!_discovered_refs[i].is_empty()) {
1027       return true;
1028     }
1029   }
1030   return false;
1031 }
1032 
1033 // Preclean the discovered references by removing those
1034 // whose referents are alive, and by marking from those that
1035 // are not active. These lists can be handled here
1036 // in any order and, indeed, concurrently.
1037 void ReferenceProcessor::preclean_discovered_references(
1038   BoolObjectClosure* is_alive,
1039   OopClosure* keep_alive,
1040   VoidClosure* complete_gc,
1041   YieldClosure* yield,
1042   GCTimer* gc_timer) {

1043 
1044   // Soft references
1045   {
1046     GCTraceTime(Debug, gc, ref) tm("Preclean SoftReferences", gc_timer);

1047     for (uint i = 0; i < _max_num_queues; i++) {
1048       if (yield->should_return()) {
1049         return;
1050       }
1051       preclean_discovered_reflist(_discoveredSoftRefs[i], is_alive,
1052                                   keep_alive, complete_gc, yield);



1053     }

1054   }
1055 
1056   // Weak references
1057   {
1058     GCTraceTime(Debug, gc, ref) tm("Preclean WeakReferences", gc_timer);

1059     for (uint i = 0; i < _max_num_queues; i++) {
1060       if (yield->should_return()) {
1061         return;
1062       }
1063       preclean_discovered_reflist(_discoveredWeakRefs[i], is_alive,
1064                                   keep_alive, complete_gc, yield);



1065     }

1066   }
1067 
1068   // Final references
1069   {
1070     GCTraceTime(Debug, gc, ref) tm("Preclean FinalReferences", gc_timer);

1071     for (uint i = 0; i < _max_num_queues; i++) {
1072       if (yield->should_return()) {
1073         return;
1074       }
1075       preclean_discovered_reflist(_discoveredFinalRefs[i], is_alive,
1076                                   keep_alive, complete_gc, yield);



1077     }

1078   }
1079 
1080   // Phantom references
1081   {
1082     GCTraceTime(Debug, gc, ref) tm("Preclean PhantomReferences", gc_timer);

1083     for (uint i = 0; i < _max_num_queues; i++) {
1084       if (yield->should_return()) {
1085         return;
1086       }
1087       preclean_discovered_reflist(_discoveredPhantomRefs[i], is_alive,
1088                                   keep_alive, complete_gc, yield);



1089     }

1090   }
1091 }
1092 
1093 // Walk the given discovered ref list, and remove all reference objects
1094 // whose referents are still alive, whose referents are NULL or which
1095 // are not active (have a non-NULL next field). NOTE: When we are
1096 // thus precleaning the ref lists (which happens single-threaded today),
1097 // we do not disable refs discovery to honor the correct semantics of
1098 // java.lang.Reference. As a result, we need to be careful below
1099 // that ref removal steps interleave safely with ref discovery steps
1100 // (in this thread).
1101 void
1102 ReferenceProcessor::preclean_discovered_reflist(DiscoveredList&    refs_list,
1103                                                 BoolObjectClosure* is_alive,
1104                                                 OopClosure*        keep_alive,
1105                                                 VoidClosure*       complete_gc,
1106                                                 YieldClosure*      yield) {
1107   DiscoveredListIterator iter(refs_list, keep_alive, is_alive);
1108   while (iter.has_next()) {



1109     iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */));
1110     oop obj = iter.obj();
1111     oop next = java_lang_ref_Reference::next(obj);
1112     if (iter.referent() == NULL || iter.is_referent_alive() ||
1113         next != NULL) {
1114       // The referent has been cleared, or is alive, or the Reference is not
1115       // active; we need to trace and mark its cohort.
1116       log_develop_trace(gc, ref)("Precleaning Reference (" INTPTR_FORMAT ": %s)",
1117                                  p2i(iter.obj()), iter.obj()->klass()->internal_name());
1118       // Remove Reference object from list
1119       iter.remove();
1120       // Keep alive its cohort.
1121       iter.make_referent_alive();
1122       if (UseCompressedOops) {
1123         narrowOop* next_addr = (narrowOop*)java_lang_ref_Reference::next_addr_raw(obj);
1124         keep_alive->do_oop(next_addr);
1125       } else {
1126         oop* next_addr = (oop*)java_lang_ref_Reference::next_addr_raw(obj);
1127         keep_alive->do_oop(next_addr);
1128       }
1129       iter.move_to_next();
1130     } else {
1131       iter.next();
1132     }
1133   }
1134   // Close the reachable set
1135   complete_gc->do_void();
1136 
1137   NOT_PRODUCT(
1138     if (iter.processed() > 0) {
1139       log_develop_trace(gc, ref)(" Dropped " SIZE_FORMAT " Refs out of " SIZE_FORMAT " Refs in discovered list " INTPTR_FORMAT,
1140         iter.removed(), iter.processed(), p2i(&refs_list));
1141     }
1142   )

1143 }
1144 
1145 const char* ReferenceProcessor::list_name(uint i) {
1146    assert(i <= _max_num_queues * number_of_subclasses_of_ref(),
1147           "Out of bounds index");
1148 
1149    int j = i / _max_num_queues;
1150    switch (j) {
1151      case 0: return "SoftRef";
1152      case 1: return "WeakRef";
1153      case 2: return "FinalRef";
1154      case 3: return "PhantomRef";
1155    }
1156    ShouldNotReachHere();
1157    return NULL;
1158 }


 595                     DiscoveredList                refs_lists[],
 596                     bool                         clear_referent,
 597                     bool                          marks_oops_alive,
 598                     ReferenceProcessorPhaseTimes* phase_times)
 599     : ProcessTask(ref_processor, refs_lists, marks_oops_alive, phase_times),
 600       _clear_referent(clear_referent)
 601   { }
 602   virtual void work(unsigned int i, BoolObjectClosure& is_alive,
 603                     OopClosure& keep_alive,
 604                     VoidClosure& complete_gc)
 605   {
 606     RefProcWorkerTimeTracker tt(ReferenceProcessorPhaseTimes::RefPhase3, _phase_times, i);
 607 
 608     _ref_processor.process_phase3(_refs_lists[i], _clear_referent,
 609                                   &is_alive, &keep_alive, &complete_gc);
 610   }
 611 private:
 612   bool _clear_referent;
 613 };
 614 
 615 void ReferenceProcessor::log_reflist(const char* prefix, DiscoveredList list[], uint num_active_queues) {
 616   LogTarget(Trace, gc, ref) lt;
 617 
 618   if (!lt.is_enabled()) {
 619     return;
 620   }
 621 
 622   size_t total = 0;
 623 
 624   LogStream ls(lt);
 625   ls.print("%s", prefix);
 626   for (uint i = 0; i < num_active_queues; i++) {
 627     ls.print(SIZE_FORMAT " ", list[i].length());
 628     total += list[i].length();
 629   }
 630   ls.print_cr("(" SIZE_FORMAT ")", total);
 631 }
 632 
 633 #ifndef PRODUCT
 634 void ReferenceProcessor::log_reflist_counts(DiscoveredList ref_lists[], uint num_active_queues) {
 635   if (!log_is_enabled(Trace, gc, ref)) {
 636     return;
 637   }
 638 
 639   log_reflist("", ref_lists, num_active_queues);




 640 #ifdef ASSERT
 641   for (uint i = num_active_queues; i < _max_num_queues; i++) {
 642     assert(ref_lists[i].length() == 0, SIZE_FORMAT " unexpected References in %u",
 643            ref_lists[i].length(), i);
 644   }
 645 #endif
 646 }
 647 #endif
 648 
 649 void ReferenceProcessor::set_active_mt_degree(uint v) {
 650   _num_queues = v;
 651   _next_id = 0;
 652 }
 653 
 654 // Balances reference queues.
 655 // Move entries from all queues[0, 1, ..., _max_num_q-1] to
 656 // queues[0, 1, ..., _num_q-1] because only the first _num_q
 657 // corresponding to the active workers will be processed.
 658 void ReferenceProcessor::balance_queues(DiscoveredList ref_lists[])
 659 {
 660   // calculate total length
 661   size_t total_refs = 0;
 662   log_develop_trace(gc, ref)("Balance ref_lists ");
 663 
 664   log_reflist_counts(ref_lists, _max_num_queues);
 665 
 666   for (uint i = 0; i < _max_num_queues; ++i) {
 667     total_refs += ref_lists[i].length();
 668   }

 669   size_t avg_refs = total_refs / _num_queues + 1;
 670   uint to_idx = 0;
 671   for (uint from_idx = 0; from_idx < _max_num_queues; from_idx++) {
 672     bool move_all = false;
 673     if (from_idx >= _num_queues) {
 674       move_all = ref_lists[from_idx].length() > 0;
 675     }
 676     while ((ref_lists[from_idx].length() > avg_refs) ||
 677            move_all) {
 678       assert(to_idx < _num_queues, "Sanity Check!");
 679       if (ref_lists[to_idx].length() < avg_refs) {
 680         // move superfluous refs
 681         size_t refs_to_move;
 682         // Move all the Ref's if the from queue will not be processed.
 683         if (move_all) {
 684           refs_to_move = MIN2(ref_lists[from_idx].length(),
 685                               avg_refs - ref_lists[to_idx].length());
 686         } else {
 687           refs_to_move = MIN2(ref_lists[from_idx].length() - avg_refs,
 688                               avg_refs - ref_lists[to_idx].length());


 709         ref_lists[to_idx].set_head(move_head);
 710         ref_lists[to_idx].inc_length(refs_to_move);
 711 
 712         // Remove the chain from the from list.
 713         if (move_tail == new_head) {
 714           // We found the end of the from list.
 715           ref_lists[from_idx].set_head(NULL);
 716         } else {
 717           ref_lists[from_idx].set_head(new_head);
 718         }
 719         ref_lists[from_idx].dec_length(refs_to_move);
 720         if (ref_lists[from_idx].length() == 0) {
 721           break;
 722         }
 723       } else {
 724         to_idx = (to_idx + 1) % _num_queues;
 725       }
 726     }
 727   }
 728 #ifdef ASSERT
 729   log_reflist_counts(ref_lists, _num_queues);
 730   size_t balanced_total_refs = 0;
 731   for (uint i = 0; i < _num_queues; ++i) {
 732     balanced_total_refs += ref_lists[i].length();
 733   }

 734   assert(total_refs == balanced_total_refs, "Balancing was incomplete");
 735 #endif
 736 }
 737 
 738 void ReferenceProcessor::process_discovered_reflist(
 739   DiscoveredList                refs_lists[],
 740   ReferencePolicy*              policy,
 741   bool                          clear_referent,
 742   BoolObjectClosure*            is_alive,
 743   OopClosure*                   keep_alive,
 744   VoidClosure*                  complete_gc,
 745   AbstractRefProcTaskExecutor*  task_executor,
 746   ReferenceProcessorPhaseTimes* phase_times)
 747 {
 748   bool mt_processing = task_executor != NULL && _processing_is_mt;
 749 
 750   phase_times->set_processing_is_mt(mt_processing);
 751 
 752   if (mt_processing && ParallelRefProcBalancingEnabled) {
 753     RefProcBalanceQueuesTimeTracker tt(phase_times);


1028     RawAccess<>::oop_store(discovered_addr, next_discovered);
1029     list->set_head(obj);
1030     list->inc_length(1);
1031 
1032     log_develop_trace(gc, ref)("Discovered reference (" INTPTR_FORMAT ": %s)", p2i(obj), obj->klass()->internal_name());
1033   }
1034   assert(oopDesc::is_oop(obj), "Discovered a bad reference");
1035   verify_referent(obj);
1036   return true;
1037 }
1038 
1039 bool ReferenceProcessor::has_discovered_references() {
1040   for (uint i = 0; i < _max_num_queues * number_of_subclasses_of_ref(); i++) {
1041     if (!_discovered_refs[i].is_empty()) {
1042       return true;
1043     }
1044   }
1045   return false;
1046 }
1047 
1048 void ReferenceProcessor::preclean_discovered_references(BoolObjectClosure* is_alive,





1049                                                         OopClosure* keep_alive,
1050                                                         VoidClosure* complete_gc,
1051                                                         YieldClosure* yield,
1052                                                         GCTimer* gc_timer) {
1053   // These lists can be handled here in any order and, indeed, concurrently.
1054     
1055   // Soft references
1056   {
1057     GCTraceTime(Debug, gc, ref) tm("Preclean SoftReferences", gc_timer);
1058     log_reflist("SoftRef before: ", _discoveredSoftRefs, _max_num_queues);
1059     for (uint i = 0; i < _max_num_queues; i++) {
1060       if (yield->should_return()) {
1061         return;
1062       }        
1063       if (preclean_discovered_reflist(_discoveredSoftRefs[i], is_alive,
1064                                       keep_alive, complete_gc, yield)) {
1065         log_reflist("SoftRef abort: ", _discoveredSoftRefs, _max_num_queues);
1066         return;
1067       }
1068     }
1069     log_reflist("SoftRef after: ", _discoveredSoftRefs, _max_num_queues);
1070   }
1071 
1072   // Weak references
1073   {
1074     GCTraceTime(Debug, gc, ref) tm("Preclean WeakReferences", gc_timer);
1075     log_reflist("WeakRef before: ", _discoveredWeakRefs, _max_num_queues);
1076     for (uint i = 0; i < _max_num_queues; i++) {
1077       if (yield->should_return()) {
1078         return;
1079       }
1080       if (preclean_discovered_reflist(_discoveredWeakRefs[i], is_alive,
1081                                       keep_alive, complete_gc, yield)) {
1082         log_reflist("WeakRef abort: ", _discoveredWeakRefs, _max_num_queues);
1083         return;
1084       }
1085     }
1086     log_reflist("WeakRef after: ", _discoveredWeakRefs, _max_num_queues);
1087   }
1088 
1089   // Final references
1090   {
1091     GCTraceTime(Debug, gc, ref) tm("Preclean FinalReferences", gc_timer);
1092     log_reflist("FinalRef before: ", _discoveredFinalRefs, _max_num_queues);
1093     for (uint i = 0; i < _max_num_queues; i++) {
1094       if (yield->should_return()) {
1095         return;
1096       }
1097       if (preclean_discovered_reflist(_discoveredFinalRefs[i], is_alive,
1098                                       keep_alive, complete_gc, yield)) {
1099         log_reflist("FinalRef abort: ", _discoveredFinalRefs, _max_num_queues);
1100         return;
1101       }
1102     }
1103     log_reflist("FinalRef after: ", _discoveredFinalRefs, _max_num_queues);
1104   }
1105 
1106   // Phantom references
1107   {
1108     GCTraceTime(Debug, gc, ref) tm("Preclean PhantomReferences", gc_timer);
1109     log_reflist("PhantomRef before: ", _discoveredPhantomRefs, _max_num_queues);
1110     for (uint i = 0; i < _max_num_queues; i++) {
1111       if (yield->should_return()) {
1112         return;
1113       }
1114       if (preclean_discovered_reflist(_discoveredPhantomRefs[i], is_alive,
1115                                       keep_alive, complete_gc, yield)) {
1116         log_reflist("PhantomRef abort: ", _discoveredPhantomRefs, _max_num_queues);
1117         return;
1118       }
1119     }
1120     log_reflist("PhantomRef after: ", _discoveredPhantomRefs, _max_num_queues);
1121   }
1122 }
1123 
1124 // Walk the given discovered ref list, and remove all reference objects
1125 // whose referents are still alive, whose referents are NULL or which
1126 // are not active (have a non-NULL next field). NOTE: When we are
1127 // thus precleaning the ref lists (which happens single-threaded today),
1128 // we do not disable refs discovery to honor the correct semantics of
1129 // java.lang.Reference. As a result, we need to be careful below
1130 // that ref removal steps interleave safely with ref discovery steps
1131 // (in this thread).
1132 bool ReferenceProcessor::preclean_discovered_reflist(DiscoveredList&    refs_list,

1133                                                      BoolObjectClosure* is_alive,
1134                                                      OopClosure*        keep_alive,
1135                                                      VoidClosure*       complete_gc,
1136                                                      YieldClosure*      yield) {
1137   DiscoveredListIterator iter(refs_list, keep_alive, is_alive);
1138   while (iter.has_next()) {
1139     if (yield->should_return_fine_grain()) {
1140       return true;
1141     }
1142     iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */));
1143     oop obj = iter.obj();
1144     oop next = java_lang_ref_Reference::next(obj);
1145     if (iter.referent() == NULL || iter.is_referent_alive() || next != NULL) {

1146       // The referent has been cleared, or is alive, or the Reference is not
1147       // active; we need to trace and mark its cohort.
1148       log_develop_trace(gc, ref)("Precleaning Reference (" INTPTR_FORMAT ": %s)",
1149                                  p2i(iter.obj()), iter.obj()->klass()->internal_name());
1150       // Remove Reference object from list
1151       iter.remove();
1152       // Keep alive its cohort.
1153       iter.make_referent_alive();
1154       if (UseCompressedOops) {
1155         narrowOop* next_addr = (narrowOop*)java_lang_ref_Reference::next_addr_raw(obj);
1156         keep_alive->do_oop(next_addr);
1157       } else {
1158         oop* next_addr = (oop*)java_lang_ref_Reference::next_addr_raw(obj);
1159         keep_alive->do_oop(next_addr);
1160       }
1161       iter.move_to_next();
1162     } else {
1163       iter.next();
1164     }
1165   }
1166   // Close the reachable set
1167   complete_gc->do_void();
1168 
1169   NOT_PRODUCT(
1170     if (iter.processed() > 0) {
1171       log_develop_trace(gc, ref)(" Dropped " SIZE_FORMAT " Refs out of " SIZE_FORMAT " Refs in discovered list " INTPTR_FORMAT,
1172         iter.removed(), iter.processed(), p2i(&refs_list));
1173     }
1174   )
1175   return false;
1176 }
1177 
1178 const char* ReferenceProcessor::list_name(uint i) {
1179    assert(i <= _max_num_queues * number_of_subclasses_of_ref(),
1180           "Out of bounds index");
1181 
1182    int j = i / _max_num_queues;
1183    switch (j) {
1184      case 0: return "SoftRef";
1185      case 1: return "WeakRef";
1186      case 2: return "FinalRef";
1187      case 3: return "PhantomRef";
1188    }
1189    ShouldNotReachHere();
1190    return NULL;
1191 }
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