/*

 * Copyright (c) 2015, 2019, 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.

 *

 */

#ifndef SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP

#define SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP

#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/shenandoah/shenandoahSharedVariables.hpp"

#include "memory/iterator.hpp"

class ShenandoahSerialRoot {

public:

  typedef void (*OopsDo)(OopClosure*);

private:

  ShenandoahSharedFlag                      _claimed;

  const OopsDo                              _oops_do;

  const ShenandoahPhaseTimings::GCParPhases _phase;

public:

  ShenandoahSerialRoot(OopsDo oops_do, ShenandoahPhaseTimings::GCParPhases);

  void oops_do(OopClosure* cl, uint worker_id);

};

class ShenandoahSerialRoots {

private:

  ShenandoahSerialRoot  _universe_root;

  ShenandoahSerialRoot  _object_synchronizer_root;

  ShenandoahSerialRoot  _management_root;

  ShenandoahSerialRoot  _system_dictionary_root;

  ShenandoahSerialRoot  _jvmti_root;

public:

  ShenandoahSerialRoots();

  void oops_do(OopClosure* cl, uint worker_id);

};

class ShenandoahWeakSerialRoot {

  typedef void (*WeakOopsDo)(BoolObjectClosure*, OopClosure*);

private:

  ShenandoahSharedFlag                      _claimed;

  const WeakOopsDo                          _weak_oops_do;

  const ShenandoahPhaseTimings::GCParPhases _phase;

public:

  ShenandoahWeakSerialRoot(WeakOopsDo oops_do, ShenandoahPhaseTimings::GCParPhases);

  void weak_oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id);

};

#if INCLUDE_JVMTI

class ShenandoahJVMTIWeakRoot : public ShenandoahWeakSerialRoot {

public:

  ShenandoahJVMTIWeakRoot();

};

#endif // INCLUDE_JVMTI

#if INCLUDE_JFR

class ShenandoahJFRWeakRoot : public ShenandoahWeakSerialRoot {

public:

  ShenandoahJFRWeakRoot();

};

#endif // INCLUDE_JFR

class ShenandoahSerialWeakRoots {

private:

  JVMTI_ONLY(ShenandoahJVMTIWeakRoot _jvmti_weak_roots;)

  JFR_ONLY(ShenandoahJFRWeakRoot     _jfr_weak_roots;)

public:

  void weak_oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id);

  void weak_oops_do(OopClosure* cl, uint worker_id);

};

template <bool CONCURRENT>

private:

  OopStorage::ParState<CONCURRENT, false /* is_const */> _itr;

  const ShenandoahPhaseTimings::GCParPhases _phase;

public:

  template <typename Closure>

  void oops_do(Closure* cl, uint worker_id);

};

template <>

class ShenandoahWeakRoot<false /*concurrent*/> {

private:

  OopStorage::ParState<false /*concurrent*/, false /*is_const*/> _itr;

  const ShenandoahPhaseTimings::GCParPhases _phase;

public:

  ShenandoahWeakRoot(OopStorage* storage, ShenandoahPhaseTimings::GCParPhases phase);

  template <typename IsAliveClosure, typename KeepAliveClosure>

  void weak_oops_do(IsAliveClosure* is_alive, KeepAliveClosure* keep_alive, uint worker_id);

};

template <bool CONCURRENT>

class ShenandoahWeakRoots {

private:

  ShenandoahWeakRoot<CONCURRENT>  _jni_roots;

  ShenandoahWeakRoot<CONCURRENT>  _string_table_roots;

  ShenandoahWeakRoot<CONCURRENT>  _resolved_method_table_roots;

  ShenandoahWeakRoot<CONCURRENT>  _vm_roots;

public:

  ShenandoahWeakRoots();

  template <typename Closure>

  void oops_do(Closure* cl, uint worker_id = 0);

};

template <>

class ShenandoahWeakRoots<false /*concurrent */> {

private:

  ShenandoahWeakRoot<false /*concurrent*/>  _jni_roots;

  ShenandoahWeakRoot<false /*concurrent*/>  _string_table_roots;

  ShenandoahWeakRoot<false /*concurrent*/>  _resolved_method_table_roots;

  ShenandoahWeakRoot<false /*concurrent*/>  _vm_roots;

public:

  ShenandoahWeakRoots();

  template <typename Closure>

  void oops_do(Closure* cl, uint worker_id = 0);

  template <typename IsAliveClosure, typename KeepAliveClosure>

  void weak_oops_do(IsAliveClosure* is_alive, KeepAliveClosure* keep_alive, uint worker_id);

};

template <bool CONCURRENT>

private:

public:

  template <typename T>

  void oops_do(T* cl, uint worker_id = 0);

};

class ShenandoahThreadRoots {

private:

  const bool _is_par;

public:

  ShenandoahThreadRoots(bool is_par);

  ~ShenandoahThreadRoots();

  void oops_do(OopClosure* oops_cl, CodeBlobClosure* code_cl, uint worker_id);

  void threads_do(ThreadClosure* tc, uint worker_id);

};

class ShenandoahStringDedupRoots {

public:

  ShenandoahStringDedupRoots();

  ~ShenandoahStringDedupRoots();

  void oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id);

};

template <typename ITR>

class ShenandoahCodeCacheRoots {

private:

  ITR _coderoots_iterator;

public:

  ShenandoahCodeCacheRoots();

  ~ShenandoahCodeCacheRoots();

  void code_blobs_do(CodeBlobClosure* blob_cl, uint worker_id);

};

template <bool CONCURRENT, bool SINGLE_THREADED>

class ShenandoahClassLoaderDataRoots {

public:

  ShenandoahClassLoaderDataRoots();

  ~ShenandoahClassLoaderDataRoots();

  void always_strong_cld_do(CLDClosure* clds, uint worker_id = 0);

  void cld_do(CLDClosure* clds, uint worker_id = 0);

};

class ShenandoahRootProcessor : public StackObj {

private:

  ShenandoahHeap* const               _heap;

  const ShenandoahPhaseTimings::Phase _phase;

public:

  ShenandoahRootProcessor(ShenandoahPhaseTimings::Phase phase);

  ~ShenandoahRootProcessor();

  ShenandoahHeap* heap() const { return _heap; }

};

template <typename ITR>

class ShenandoahRootScanner : public ShenandoahRootProcessor {

private:

  ShenandoahSerialRoots                                     _serial_roots;

  ShenandoahThreadRoots                                     _thread_roots;

  ShenandoahCodeCacheRoots<ITR>                             _code_roots;

  ShenandoahClassLoaderDataRoots<false /*concurrent*/, false /*single threaded*/>

                                                            _cld_roots;

public:

  ShenandoahRootScanner(uint n_workers, ShenandoahPhaseTimings::Phase phase);

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

  // during class unloading cycle

  void strong_roots_do(uint worker_id, OopClosure* cl);

  void strong_roots_do(uint worker_id, OopClosure* oops, CLDClosure* clds, CodeBlobClosure* code, ThreadClosure* tc = NULL);

  // Apply oops, clds and blobs to all strongly reachable roots and weakly reachable

  // roots when class unloading is disabled during this cycle

  void roots_do(uint worker_id, OopClosure* cl);

  void roots_do(uint worker_id, OopClosure* oops, CLDClosure* clds, CodeBlobClosure* code, ThreadClosure* tc = NULL);

};

typedef ShenandoahRootScanner<ShenandoahAllCodeRootsIterator> ShenandoahAllRootScanner;

typedef ShenandoahRootScanner<ShenandoahCsetCodeRootsIterator> ShenandoahCSetRootScanner;

// This scanner is only for SH::object_iteration() and only supports single-threaded

// root scanning

class ShenandoahHeapIterationRootScanner : public ShenandoahRootProcessor {

private:

  ShenandoahSerialRoots                                    _serial_roots;

  ShenandoahThreadRoots                                    _thread_roots;

  ShenandoahClassLoaderDataRoots<false /*concurrent*/, true /*single threaded*/>

                                                           _cld_roots;

  ShenandoahCodeCacheRoots<ShenandoahAllCodeRootsIterator> _code_roots;

public:

  ShenandoahHeapIterationRootScanner();

  void roots_do(OopClosure* cl);

  void strong_roots_do(OopClosure* cl);

};

// Evacuate all roots at a safepoint

class ShenandoahRootEvacuator : public ShenandoahRootProcessor {

private:

  ShenandoahSerialRoots                                     _serial_roots;

  ShenandoahClassLoaderDataRoots<false /*concurrent*/, false /*single threaded*/>

                                                            _cld_roots;

  ShenandoahThreadRoots                                     _thread_roots;

  ShenandoahSerialWeakRoots                                 _serial_weak_roots;

  ShenandoahWeakRoots<false /*concurrent*/>                 _weak_roots;

  ShenandoahStringDedupRoots                                _dedup_roots;

  ShenandoahCodeCacheRoots<ShenandoahCsetCodeRootsIterator> _code_roots;

  bool                                                      _include_concurrent_roots;

public:

  ShenandoahRootEvacuator(uint n_workers, ShenandoahPhaseTimings::Phase phase, bool include_concurrent_roots);

  void roots_do(uint worker_id, OopClosure* oops);

};

// Update all roots at a safepoint

class ShenandoahRootUpdater : public ShenandoahRootProcessor {

private:

  ShenandoahSerialRoots                                     _serial_roots;

  ShenandoahClassLoaderDataRoots<false /*concurrent*/, false /*single threaded*/>

                                                            _cld_roots;

  ShenandoahThreadRoots                                     _thread_roots;

  ShenandoahSerialWeakRoots                                 _serial_weak_roots;

  ShenandoahWeakRoots<false /*concurrent*/>                 _weak_roots;

  ShenandoahStringDedupRoots                                _dedup_roots;

  ShenandoahCodeCacheRoots<ShenandoahCsetCodeRootsIterator> _code_roots;

  const bool                                                _update_code_cache;

public:

  ShenandoahRootUpdater(uint n_workers, ShenandoahPhaseTimings::Phase phase, bool update_code_cache);

  template<typename IsAlive, typename KeepAlive>

  void roots_do(uint worker_id, IsAlive* is_alive, KeepAlive* keep_alive);

};

// Adjuster all roots at a safepoint during full gc

class ShenandoahRootAdjuster : public ShenandoahRootProcessor {

private:

  ShenandoahSerialRoots                                     _serial_roots;

  ShenandoahClassLoaderDataRoots<false /*concurrent*/, false /*single threaded*/>

                                                            _cld_roots;

  ShenandoahThreadRoots                                     _thread_roots;

  ShenandoahSerialWeakRoots                                 _serial_weak_roots;

  ShenandoahWeakRoots<false /*concurrent*/>                 _weak_roots;

  ShenandoahStringDedupRoots                                _dedup_roots;

  ShenandoahCodeCacheRoots<ShenandoahAllCodeRootsIterator>  _code_roots;

public:

  ShenandoahRootAdjuster(uint n_workers, ShenandoahPhaseTimings::Phase phase);

  void roots_do(uint worker_id, OopClosure* oops);

};

#endif // SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP