/*

 * Copyright (c) 2015, 2018, Red Hat, Inc. All rights reserved.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "code/codeCache.hpp"

#include "gc/shared/oopStorageParState.hpp"

#include "gc/shenandoah/shenandoahCodeRoots.hpp"

#include "gc/shenandoah/shenandoahHeap.hpp"

#include "gc/shenandoah/shenandoahPhaseTimings.hpp"

#include "gc/shared/strongRootsScope.hpp"

#include "gc/shared/workgroup.hpp"

#include "memory/allocation.hpp"

#include "memory/iterator.hpp"

class ParallelCLDRootIterator {

public:

  ParallelCLDRootIterator();

  void root_cld_do(CLDClosure* strong, CLDClosure* weak);

};

enum Shenandoah_process_roots_tasks {

  SHENANDOAH_RP_PS_Universe_oops_do,

  SHENANDOAH_RP_PS_JNIHandles_oops_do,

  SHENANDOAH_RP_PS_JNIHandles_weak_oops_do,

  SHENANDOAH_RP_PS_ObjectSynchronizer_oops_do,

  SHENANDOAH_RP_PS_Management_oops_do,

  SHENANDOAH_RP_PS_SystemDictionary_oops_do,

  SHENANDOAH_RP_PS_jvmti_oops_do,

  // Leave this one last.

  SHENANDOAH_RP_PS_NumElements

};

class ShenandoahRootProcessor : public StackObj {

  SubTasksDone* _process_strong_tasks;

  StrongRootsScope _srs;

  OopStorage::ParState<false, false> _par_state_string;

  ShenandoahPhaseTimings::Phase _phase;

  ParallelCLDRootIterator   _cld_iterator;

  ShenandoahAllCodeRootsIterator _coderoots_all_iterator;

  CodeBlobClosure* _threads_nmethods_cl;

  void process_java_roots(OopClosure* scan_non_heap_roots,

                          CLDClosure* scan_strong_clds,

                          CLDClosure* scan_weak_clds,

                          CodeBlobClosure* scan_strong_code,

                          ThreadClosure* thread_cl,

                          uint worker_i);

  void process_vm_roots(OopClosure* scan_non_heap_roots,

                        OopClosure* scan_non_heap_weak_roots,

                        OopClosure* weak_jni_roots,

                        uint worker_i);

public:

  ShenandoahRootProcessor(ShenandoahHeap* heap, uint n_workers,

                          ShenandoahPhaseTimings::Phase phase);

  ~ShenandoahRootProcessor();

  // Apply oops, clds and blobs to all strongly reachable roots in the system

  void process_strong_roots(OopClosure* oops, OopClosure* weak_oops,

                            CLDClosure* clds,

                            CLDClosure* weak_clds,

                            CodeBlobClosure* blobs,

                            ThreadClosure* thread_cl,

                            uint worker_id);

  // Apply oops, clds and blobs to strongly and weakly reachable roots in the system

  void process_all_roots(OopClosure* oops, OopClosure* weak_oops,

                         CLDClosure* clds,

                         CodeBlobClosure* blobs,

                         ThreadClosure* thread_cl,

                         uint worker_id);

  // For slow debug/verification code

  void process_all_roots_slow(OopClosure* oops);

  // Number of worker threads used by the root processor.

  uint n_workers() const;

};

class ShenandoahRootEvacuator : public StackObj {

  SubTasksDone* _evacuation_tasks;

  StrongRootsScope _srs;

  ShenandoahPhaseTimings::Phase _phase;

  ShenandoahCsetCodeRootsIterator _coderoots_cset_iterator;

  enum Shenandoah_evacuate_roots_tasks {

      SHENANDOAH_EVAC_jvmti_oops_do,

      // Leave this one last.

      SHENANDOAH_EVAC_NumElements

  };

public:

  ShenandoahRootEvacuator(ShenandoahHeap* heap, uint n_workers,

                          ShenandoahPhaseTimings::Phase phase);

  ~ShenandoahRootEvacuator();

  void process_evacuate_roots(OopClosure* oops,

                              CodeBlobClosure* blobs,

                              uint worker_id);

  // Number of worker threads used by the root processor.

  uint n_workers() const;

};