8221435: Shenandoah should not mark through weak roots
Reviewed-by: rkennke, shade
/*
* 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
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*/
#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/shared/strongRootsScope.hpp"
#include "gc/shared/weakProcessor.hpp"
#include "gc/shared/weakProcessorPhaseTimes.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_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;
WeakProcessorPhaseTimes _weak_processor_timings;
WeakProcessor::Task _weak_processor_task;
bool _processed_weak_roots;
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,
uint worker_i);
void weak_processor_timing_to_shenandoah_timing(const WeakProcessorPhases::Phase wpp,
const ShenandoahPhaseTimings::GCParPhases spp,
ShenandoahWorkerTimings* worker_times) const;
public:
ShenandoahRootProcessor(ShenandoahHeap* heap, uint n_workers,
ShenandoahPhaseTimings::Phase phase);
~ShenandoahRootProcessor();
// Apply oops, clds and blobs to all strongly reachable roots in the system.
// Optionally, apply class loader closure to weak clds, depending on class unloading
// for the particular GC cycles.
void process_strong_roots(OopClosure* oops,
CLDClosure* clds,
CLDClosure* weak_clds,
CodeBlobClosure* blobs,
ThreadClosure* thread_cl,
uint worker_id);
// Apply oops, clds and blobs to strongly reachable roots in the system
void process_all_roots(OopClosure* oops,
CLDClosure* clds,
CodeBlobClosure* blobs,
ThreadClosure* thread_cl,
uint worker_id);
// Apply oops, clds and blobs to strongly and weakly reachable roots in the system
void update_all_roots(OopClosure* oops,
CLDClosure* clds,
CodeBlobClosure* blobs,
ThreadClosure* thread_cl,
uint worker_id);
// Apply oops, clds and blobs to strongly and weakly reachable roots in the system
// during traversal GC.
// It cleans up and updates weak roots in one iteration.
void traversal_update_all_roots(OopClosure* 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;
};
#endif // SHARE_GC_SHENANDOAH_SHENANDOAHROOTPROCESSOR_HPP