127 lines
4.0 KiB
C++
127 lines
4.0 KiB
C++
/*
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* Copyright (c) 2017, 2020, Red Hat, Inc. 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_SHENANDOAH_SHENANDOAHSTRDEDUPQUEUE_INLINE_HPP
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#define SHARE_GC_SHENANDOAH_SHENANDOAHSTRDEDUPQUEUE_INLINE_HPP
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#include "gc/shenandoah/shenandoahStrDedupQueue.hpp"
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#include "oops/access.hpp"
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#include "runtime/atomic.hpp"
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// With concurrent string dedup cleaning up, GC worker threads
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// may see oops just enqueued, so release_store and load_acquire
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// relationship needs to be established between enqueuing threads
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// and GC workers.
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// For example, when GC sees a slot (index), there must be a valid
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// (dead or live) oop.
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// Note: There is no concern if GC misses newly enqueued oops,
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// since LRB ensures they are in to-space.
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template <uint buffer_size>
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ShenandoahOopBuffer<buffer_size>::ShenandoahOopBuffer() :
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_index(0), _next(NULL) {
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}
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template <uint buffer_size>
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bool ShenandoahOopBuffer<buffer_size>::is_full() const {
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return index_acquire() >= buffer_size;
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}
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template <uint buffer_size>
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bool ShenandoahOopBuffer<buffer_size>::is_empty() const {
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return index_acquire() == 0;
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}
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template <uint buffer_size>
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uint ShenandoahOopBuffer<buffer_size>::size() const {
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return index_acquire();
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}
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template <uint buffer_size>
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void ShenandoahOopBuffer<buffer_size>::push(oop obj) {
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assert(!is_full(), "Buffer is full");
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uint idx = index_acquire();
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RawAccess<IS_NOT_NULL>::oop_store(&_buf[idx], obj);
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set_index_release(idx + 1);
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}
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template <uint buffer_size>
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oop ShenandoahOopBuffer<buffer_size>::pop() {
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assert(!is_empty(), "Buffer is empty");
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uint idx = index_acquire() - 1;
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oop value = NativeAccess<ON_PHANTOM_OOP_REF | AS_NO_KEEPALIVE | MO_ACQUIRE>::oop_load(&_buf[idx]);
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set_index_release(idx);
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return value;
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}
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template <uint buffer_size>
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void ShenandoahOopBuffer<buffer_size>::set_next(ShenandoahOopBuffer<buffer_size>* next) {
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_next = next;
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}
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template <uint buffer_size>
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ShenandoahOopBuffer<buffer_size>* ShenandoahOopBuffer<buffer_size>::next() const {
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return _next;
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}
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template <uint buffer_size>
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void ShenandoahOopBuffer<buffer_size>::reset() {
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_index = 0;
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_next = NULL;
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}
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template <uint buffer_size>
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uint ShenandoahOopBuffer<buffer_size>::index_acquire() const {
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return Atomic::load_acquire(&_index);
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}
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template <uint buffer_size>
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void ShenandoahOopBuffer<buffer_size>::set_index_release(uint index) {
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return Atomic::release_store(&_index, index);
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}
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template <uint buffer_size>
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void ShenandoahOopBuffer<buffer_size>::unlink_or_oops_do(StringDedupUnlinkOrOopsDoClosure* cl) {
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uint len = size();
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for (uint index = 0; index < len; index ++) {
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oop* obj_addr = &_buf[index];
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if (*obj_addr != NULL) {
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if (cl->is_alive(*obj_addr)) {
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cl->keep_alive(obj_addr);
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} else {
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RawAccess<MO_RELEASE>::oop_store(&_buf[index], oop());
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}
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}
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}
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}
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template <uint buffer_size>
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void ShenandoahOopBuffer<buffer_size>::oops_do(OopClosure* cl) {
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uint len = size();
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for (uint index = 0; index < len; index ++) {
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cl->do_oop(&_buf[index]);
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}
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}
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#endif // SHARE_GC_SHENANDOAH_SHENANDOAHSTRDEDUPQUEUE_INLINE_HPP
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