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104 lines
3.8 KiB
C++
104 lines
3.8 KiB
C++
/*
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* Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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_SHARED_WEAKPROCESSOR_HPP
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#define SHARE_GC_SHARED_WEAKPROCESSOR_HPP
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#include "gc/shared/oopStorageParState.hpp"
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#include "gc/shared/oopStorageSetParState.hpp"
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#include "gc/shared/workgroup.hpp"
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#include "memory/allocation.hpp"
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class WeakProcessorPhaseTimes;
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class WorkGang;
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// Helper class to aid in root scanning and cleaning of weak oops in the VM.
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//
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// New containers of weak oops added to this class will automatically
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// be cleaned by all GCs, including the young generation GCs.
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class WeakProcessor : AllStatic {
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public:
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// Visit all oop*s and apply the keep_alive closure if the referenced
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// object is considered alive by the is_alive closure, otherwise do some
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// container specific cleanup of element holding the oop.
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static void weak_oops_do(BoolObjectClosure* is_alive, OopClosure* keep_alive);
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// Visit all oop*s and apply the given closure.
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static void oops_do(OopClosure* closure);
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// Parallel version. Uses ergo_workers() to determine the number of
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// threads to use, limited by the total workers and phase_times'
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// max_threads.
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// IsAlive must be derived from BoolObjectClosure.
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// KeepAlive must be derived from OopClosure.
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template<typename IsAlive, typename KeepAlive>
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static void weak_oops_do(WorkGang* workers,
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IsAlive* is_alive,
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KeepAlive* keep_alive,
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WeakProcessorPhaseTimes* phase_times);
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// Convenience parallel version. Uses ergo_workers() to determine the
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// number of threads to use, limited by the total workers. Implicitly
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// logs phase times.
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// IsAlive must be derived from BoolObjectClosure.
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// KeepAlive must be derived from OopClosure.
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template<typename IsAlive, typename KeepAlive>
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static void weak_oops_do(WorkGang* workers,
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IsAlive* is_alive,
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KeepAlive* keep_alive,
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uint indent_log);
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// Uses the total number of weak references and ReferencesPerThread to
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// determine the number of threads to use, limited by max_workers.
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static uint ergo_workers(uint max_workers);
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class Task;
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private:
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template<typename IsAlive, typename KeepAlive>
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class CountingClosure;
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class GangTask;
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};
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class WeakProcessor::Task {
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typedef OopStorage::ParState<false, false> StorageState;
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WeakProcessorPhaseTimes* _phase_times;
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uint _nworkers;
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OopStorageSetWeakParState<false, false> _storage_states;
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void initialize();
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public:
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Task(uint nworkers); // No time tracking.
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Task(WeakProcessorPhaseTimes* phase_times, uint nworkers);
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template<typename IsAlive, typename KeepAlive>
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void work(uint worker_id, IsAlive* is_alive, KeepAlive* keep_alive);
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void report_num_dead();
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};
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#endif // SHARE_GC_SHARED_WEAKPROCESSOR_HPP
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