author | jgeorge |
Tue, 20 Mar 2018 11:24:32 +0530 | |
changeset 49463 | ccb003941743 |
parent 47216 | 71c04702a3d5 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2000, 2015, 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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package sun.jvm.hotspot.gc.shared; |
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import java.util.*; |
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import sun.jvm.hotspot.debugger.*; |
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import sun.jvm.hotspot.runtime.*; |
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import sun.jvm.hotspot.types.*; |
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/** A space that supports compaction operations. This is usually, but |
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not necessarily, a space that is normally contiguous. But, for |
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example, a free-list-based space whose normal collection is a |
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mark-sweep without compaction could still support compaction in |
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full GC's. */ |
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public abstract class CompactibleSpace extends Space { |
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private static AddressField compactionTopField; |
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static { |
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VM.registerVMInitializedObserver(new Observer() { |
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public void update(Observable o, Object data) { |
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initialize(VM.getVM().getTypeDataBase()); |
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} |
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}); |
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} |
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private static synchronized void initialize(TypeDataBase db) { |
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Type type = db.lookupType("CompactibleSpace"); |
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compactionTopField = type.getAddressField("_compaction_top"); |
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} |
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public CompactibleSpace(Address addr) { |
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super(addr); |
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} |
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/** May be used temporarily during a compaction phase. */ |
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public Address compactionTop() { |
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return compactionTopField.getValue(addr); |
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} |
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} |