| /* |
| * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * 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/classLoaderData.hpp" |
| #include "memory/cardTableRS.hpp" |
| #include "memory/genRemSet.hpp" |
| |
| // This kind of "BarrierSet" allows a "CollectedHeap" to detect and |
| // enumerate ref fields that have been modified (since the last |
| // enumeration.) |
| |
| uintx GenRemSet::max_alignment_constraint(Name nm) { |
| assert(nm == GenRemSet::CardTable, "Unrecognized GenRemSet type."); |
| return CardTableRS::ct_max_alignment_constraint(); |
| } |
| |
| class HasAccumulatedModifiedOopsClosure : public KlassClosure { |
| bool _found; |
| public: |
| HasAccumulatedModifiedOopsClosure() : _found(false) {} |
| void do_klass(Klass* klass) { |
| if (_found) { |
| return; |
| } |
| |
| if (klass->has_accumulated_modified_oops()) { |
| _found = true; |
| } |
| } |
| bool found() { |
| return _found; |
| } |
| }; |
| |
| bool KlassRemSet::mod_union_is_clear() { |
| HasAccumulatedModifiedOopsClosure closure; |
| ClassLoaderDataGraph::classes_do(&closure); |
| |
| return !closure.found(); |
| } |
| |
| |
| class ClearKlassModUnionClosure : public KlassClosure { |
| public: |
| void do_klass(Klass* klass) { |
| if (klass->has_accumulated_modified_oops()) { |
| klass->clear_accumulated_modified_oops(); |
| } |
| } |
| }; |
| |
| void KlassRemSet::clear_mod_union() { |
| ClearKlassModUnionClosure closure; |
| ClassLoaderDataGraph::classes_do(&closure); |
| } |