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77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
/*
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* Copyright (c) 2001, 2013, 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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#include "precompiled.hpp"
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#include "classfile/classLoaderData.hpp"
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#include "memory/cardTableRS.hpp"
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#include "memory/genRemSet.hpp"
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// This kind of "BarrierSet" allows a "CollectedHeap" to detect and
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// enumerate ref fields that have been modified (since the last
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// enumeration.)
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uintx GenRemSet::max_alignment_constraint() {
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return CardTableRS::ct_max_alignment_constraint();
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}
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class HasAccumulatedModifiedOopsClosure : public KlassClosure {
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bool _found;
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public:
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HasAccumulatedModifiedOopsClosure() : _found(false) {}
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void do_klass(Klass* klass) {
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if (_found) {
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return;
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}
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if (klass->has_accumulated_modified_oops()) {
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_found = true;
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}
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}
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bool found() {
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return _found;
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}
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};
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bool KlassRemSet::mod_union_is_clear() {
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HasAccumulatedModifiedOopsClosure closure;
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ClassLoaderDataGraph::classes_do(&closure);
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return !closure.found();
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}
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class ClearKlassModUnionClosure : public KlassClosure {
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public:
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void do_klass(Klass* klass) {
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if (klass->has_accumulated_modified_oops()) {
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klass->clear_accumulated_modified_oops();
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}
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}
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};
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void KlassRemSet::clear_mod_union() {
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ClearKlassModUnionClosure closure;
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ClassLoaderDataGraph::classes_do(&closure);
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}
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