src/hotspot/share/gc/shenandoah/shenandoahRootProcessor.hpp
author zgu
Thu, 28 Mar 2019 13:53:41 -0400
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permissions -rw-r--r--
8221629: Shenandoah: Cleanup class unloading logic Reviewed-by: rkennke
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/*
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 * Copyright (c) 2015, 2019, Red Hat, Inc. All rights reserved.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP
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#define SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP
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#include "code/codeCache.hpp"
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#include "gc/shared/oopStorageParState.hpp"
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#include "gc/shenandoah/shenandoahCodeRoots.hpp"
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#include "gc/shenandoah/shenandoahHeap.hpp"
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#include "gc/shenandoah/shenandoahPhaseTimings.hpp"
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#include "gc/shared/strongRootsScope.hpp"
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#include "gc/shared/weakProcessor.hpp"
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#include "gc/shared/weakProcessorPhaseTimes.hpp"
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#include "gc/shared/workgroup.hpp"
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#include "memory/allocation.hpp"
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#include "memory/iterator.hpp"
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class ParallelCLDRootIterator {
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  ParallelCLDRootIterator();
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  void root_cld_do(CLDClosure* strong, CLDClosure* weak);
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};
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enum Shenandoah_process_roots_tasks {
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  SHENANDOAH_RP_PS_Universe_oops_do,
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  SHENANDOAH_RP_PS_JNIHandles_oops_do,
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  SHENANDOAH_RP_PS_ObjectSynchronizer_oops_do,
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  SHENANDOAH_RP_PS_Management_oops_do,
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  SHENANDOAH_RP_PS_SystemDictionary_oops_do,
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  SHENANDOAH_RP_PS_jvmti_oops_do,
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  // Leave this one last.
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  SHENANDOAH_RP_PS_NumElements
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};
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class ShenandoahRootProcessor : public StackObj {
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  SubTasksDone* _process_strong_tasks;
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  StrongRootsScope _srs;
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  OopStorage::ParState<false, false> _par_state_string;
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  ShenandoahPhaseTimings::Phase _phase;
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  ParallelCLDRootIterator   _cld_iterator;
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  ShenandoahAllCodeRootsIterator _coderoots_all_iterator;
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  CodeBlobClosure* _threads_nmethods_cl;
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  WeakProcessorPhaseTimes _weak_processor_timings;
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  WeakProcessor::Task     _weak_processor_task;
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  bool                    _processed_weak_roots;
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  void process_java_roots(OopClosure* scan_non_heap_roots,
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                          CLDClosure* scan_strong_clds,
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                          CLDClosure* scan_weak_clds,
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                          CodeBlobClosure* scan_strong_code,
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                          ThreadClosure* thread_cl,
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                          uint worker_i);
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  void process_vm_roots(OopClosure* scan_non_heap_roots,
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                        uint worker_i);
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  void weak_processor_timing_to_shenandoah_timing(const WeakProcessorPhases::Phase wpp,
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                                                  const ShenandoahPhaseTimings::GCParPhases spp,
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                                                  ShenandoahWorkerTimings* worker_times) const;
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  ShenandoahRootProcessor(ShenandoahHeap* heap, uint n_workers,
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                          ShenandoahPhaseTimings::Phase phase);
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  ~ShenandoahRootProcessor();
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  // Apply oops, clds and blobs to all strongly reachable roots in the system.
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  // Optionally, apply class loader closure to weak clds, depending on class unloading
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  // for the particular GC cycles.
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  void process_strong_roots(OopClosure* oops,
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                            CLDClosure* clds,
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                            CodeBlobClosure* blobs,
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                            ThreadClosure* thread_cl,
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                            uint worker_id);
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  // Apply oops, clds and blobs to strongly reachable roots in the system
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  void process_all_roots(OopClosure* oops,
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                         CLDClosure* clds,
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                         CodeBlobClosure* blobs,
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                         ThreadClosure* thread_cl,
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                         uint worker_id);
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  // Apply oops, clds and blobs to strongly and weakly reachable roots in the system
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  template <typename IsAlive>
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  void update_all_roots(OopClosure* oops,
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                        CLDClosure* clds,
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                        CodeBlobClosure* blobs,
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                        ThreadClosure* thread_cl,
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                        uint worker_id);
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  // For slow debug/verification code
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  void process_all_roots_slow(OopClosure* oops);
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  // Number of worker threads used by the root processor.
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  uint n_workers() const;
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};
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class ShenandoahRootEvacuator : public StackObj {
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  SubTasksDone* _evacuation_tasks;
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  StrongRootsScope _srs;
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  ShenandoahPhaseTimings::Phase _phase;
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  ShenandoahCsetCodeRootsIterator _coderoots_cset_iterator;
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  enum Shenandoah_evacuate_roots_tasks {
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      SHENANDOAH_EVAC_jvmti_oops_do,
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      // Leave this one last.
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      SHENANDOAH_EVAC_NumElements
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  };
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public:
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  ShenandoahRootEvacuator(ShenandoahHeap* heap, uint n_workers,
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                          ShenandoahPhaseTimings::Phase phase);
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  ~ShenandoahRootEvacuator();
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  void process_evacuate_roots(OopClosure* oops,
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                              CodeBlobClosure* blobs,
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                              uint worker_id);
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  // Number of worker threads used by the root processor.
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  uint n_workers() const;
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};
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#endif // SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP