/*

 * 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.

 *

 */

#include "precompiled.hpp"

#include "classfile/classLoaderDataGraph.hpp"

#include "classfile/stringTable.hpp"

#include "classfile/systemDictionary.hpp"

#include "code/codeCache.hpp"

#include "gc/shenandoah/shenandoahClosures.inline.hpp"

#include "gc/shenandoah/shenandoahRootProcessor.inline.hpp"

#include "gc/shenandoah/shenandoahHeap.hpp"

#include "gc/shenandoah/shenandoahHeuristics.hpp"

#include "gc/shenandoah/shenandoahPhaseTimings.hpp"

#include "gc/shenandoah/shenandoahStringDedup.hpp"

#include "gc/shenandoah/shenandoahTimingTracker.hpp"

#include "gc/shenandoah/shenandoahVMOperations.hpp"

#include "gc/shared/weakProcessor.inline.hpp"

#include "memory/allocation.inline.hpp"

#include "memory/iterator.hpp"

#include "memory/resourceArea.hpp"

#include "memory/universe.hpp"

#include "runtime/thread.hpp"

#include "services/management.hpp"

ShenandoahSerialRoot::ShenandoahSerialRoot(ShenandoahSerialRoot::OopsDo oops_do, ShenandoahPhaseTimings::GCParPhases phase) :

  _claimed(false), _oops_do(oops_do), _phase(phase) {

}

void ShenandoahSerialRoot::oops_do(OopClosure* cl, uint worker_id) {

  if (!_claimed && Atomic::cmpxchg(true, &_claimed, false) == false) {

    ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();

    ShenandoahWorkerTimingsTracker timer(worker_times, _phase, worker_id);

    _oops_do(cl);

  }

}

ShenandoahSerialRoots::ShenandoahSerialRoots() :

  _universe_root(&Universe::oops_do, ShenandoahPhaseTimings::UniverseRoots),

  _object_synchronizer_root(&ObjectSynchronizer::oops_do, ShenandoahPhaseTimings::ObjectSynchronizerRoots),

  _management_root(&Management::oops_do, ShenandoahPhaseTimings::ManagementRoots),

  _system_dictionary_root(&SystemDictionary::oops_do, ShenandoahPhaseTimings::SystemDictionaryRoots),

  _jvmti_root(&JvmtiExport::oops_do, ShenandoahPhaseTimings::JVMTIRoots) {

}

void ShenandoahSerialRoots::oops_do(OopClosure* cl, uint worker_id) {

  _universe_root.oops_do(cl, worker_id);

  _object_synchronizer_root.oops_do(cl, worker_id);

  _management_root.oops_do(cl, worker_id);

  _system_dictionary_root.oops_do(cl, worker_id);

  _jvmti_root.oops_do(cl, worker_id);

}

ShenandoahThreadRoots::ShenandoahThreadRoots(bool is_par) : _is_par(is_par) {

  Threads::change_thread_claim_token();

}

void ShenandoahThreadRoots::oops_do(OopClosure* oops_cl, CodeBlobClosure* code_cl, uint worker_id) {

  ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();

  ShenandoahWorkerTimingsTracker timer(worker_times, ShenandoahPhaseTimings::ThreadRoots, worker_id);

  ResourceMark rm;

  Threads::possibly_parallel_oops_do(_is_par, oops_cl, code_cl);

}

void ShenandoahThreadRoots::threads_do(ThreadClosure* tc, uint worker_id) {

  ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();

  ShenandoahWorkerTimingsTracker timer(worker_times, ShenandoahPhaseTimings::ThreadRoots, worker_id);

  ResourceMark rm;

  Threads::possibly_parallel_threads_do(_is_par, tc);

}

ShenandoahThreadRoots::~ShenandoahThreadRoots() {

  Threads::assert_all_threads_claimed();

}

ShenandoahWeakRoots::ShenandoahWeakRoots(uint n_workers) :

  _process_timings(n_workers),

  _task(&_process_timings, n_workers) {

}

ShenandoahWeakRoots::~ShenandoahWeakRoots() {

  ShenandoahWorkerTimings* worker_times = ShenandoahHeap::heap()->phase_timings()->worker_times();

  ShenandoahTimingConverter::weak_processing_timing_to_shenandoah_timing(&_process_timings,

                                                                         worker_times);

}

ShenandoahStringDedupRoots::ShenandoahStringDedupRoots() {

  if (ShenandoahStringDedup::is_enabled()) {

    StringDedup::gc_prologue(false);

  }

}

ShenandoahStringDedupRoots::~ShenandoahStringDedupRoots() {

  if (ShenandoahStringDedup::is_enabled()) {

    StringDedup::gc_epilogue();

  }

}

void ShenandoahStringDedupRoots::oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive, uint worker_id) {

  if (ShenandoahStringDedup::is_enabled()) {

    ShenandoahStringDedup::parallel_oops_do(is_alive, keep_alive, worker_id);

  }

}

ShenandoahRootProcessor::ShenandoahRootProcessor(ShenandoahPhaseTimings::Phase phase) :

  _heap(ShenandoahHeap::heap()),

  _phase(phase) {

  assert(SafepointSynchronize::is_at_safepoint(), "Must at safepoint");

  _heap->phase_timings()->record_workers_start(_phase);

}

ShenandoahRootProcessor::~ShenandoahRootProcessor() {

  assert(SafepointSynchronize::is_at_safepoint(), "Must at safepoint");

  _heap->phase_timings()->record_workers_end(_phase);

}

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

  ShenandoahRootProcessor(phase),

  _thread_roots(n_workers > 1),

  _weak_roots(n_workers),

  _include_concurrent_roots(include_concurrent_roots) {

}

void ShenandoahRootEvacuator::roots_do(uint worker_id, OopClosure* oops) {

  MarkingCodeBlobClosure blobsCl(oops, CodeBlobToOopClosure::FixRelocations);

  CLDToOopClosure clds(oops, ClassLoaderData::_claim_strong);

  AlwaysTrueClosure always_true;

  _serial_roots.oops_do(oops, worker_id);

  if (_include_concurrent_roots) {

    _jni_roots.oops_do<OopClosure>(oops, worker_id);

  }

  _thread_roots.oops_do(oops, NULL, worker_id);

  _cld_roots.clds_do(&clds, &clds, worker_id);

  _code_roots.code_blobs_do(&blobsCl, worker_id);

  _weak_roots.oops_do<AlwaysTrueClosure, OopClosure>(&always_true, oops, worker_id);

  _dedup_roots.oops_do(&always_true, oops, worker_id);

}

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

  ShenandoahRootProcessor(phase),

  _thread_roots(n_workers > 1),

  _weak_roots(n_workers),

  _update_code_cache(update_code_cache) {

}

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

  ShenandoahRootProcessor(phase),

  _thread_roots(n_workers > 1),

  _weak_roots(n_workers) {

  assert(ShenandoahHeap::heap()->is_full_gc_in_progress(), "Full GC only");

}

void ShenandoahRootAdjuster::roots_do(uint worker_id, OopClosure* oops) {

  CodeBlobToOopClosure adjust_code_closure(oops, CodeBlobToOopClosure::FixRelocations);

  CLDToOopClosure adjust_cld_closure(oops, ClassLoaderData::_claim_strong);

  AlwaysTrueClosure always_true;

  _serial_roots.oops_do(oops, worker_id);

  _jni_roots.oops_do(oops, worker_id);

  _thread_roots.oops_do(oops, NULL, worker_id);

  _cld_roots.clds_do(&adjust_cld_closure, NULL, worker_id);

  _code_roots.code_blobs_do(&adjust_code_closure, worker_id);

  _weak_roots.oops_do<AlwaysTrueClosure, OopClosure>(&always_true, oops, worker_id);

  _dedup_roots.oops_do(&always_true, oops, worker_id);

}