Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/memory/PlaceholderTable.java @ 12837:82af7d7a0128
8003420: NPG: make new GC root for pd_set
Summary: Move protection domain oops from system dictionary entries into a seperate set; the system dictionary references entries in that set now. This allows fast iteration during non-classunloading garbage collection. Implementation based on initial prototype from Ioi Lam (iklam).
Reviewed-by: coleenp, iklam
author | tschatzl |
---|---|
date | Wed, 09 Oct 2013 10:57:01 +0200 |
parents | c18cbe5936b8 |
children |
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/* * Copyright (c) 2003, 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. * */ package sun.jvm.hotspot.memory; import sun.jvm.hotspot.debugger.*; import sun.jvm.hotspot.oops.*; import sun.jvm.hotspot.runtime.*; import sun.jvm.hotspot.utilities.*; public class PlaceholderTable extends TwoOopHashtable { public PlaceholderTable(Address addr) { super(addr); } // this is overriden here so that Hashtable.bucket will return // object of PlacholderEntry.class protected Class getHashtableEntryClass() { return PlaceholderEntry.class; } /** All array classes of primitive type, and their class loaders */ public void primArrayClassesDo(SystemDictionary.ClassAndLoaderVisitor v) { ObjectHeap heap = VM.getVM().getObjectHeap(); int tblSize = tableSize(); for (int index = 0; index < tblSize; index++) { for (PlaceholderEntry probe = (PlaceholderEntry) bucket(index); probe != null; probe = (PlaceholderEntry) probe.next()) { Symbol sym = probe.klass(); // array of primitive arrays are stored in system dictionary as placeholders FieldType ft = new FieldType(sym); if (ft.isArray()) { FieldType.ArrayInfo info = ft.getArrayInfo(); if (info.elementBasicType() != BasicType.getTObject()) { Klass arrayKlass = heap.typeArrayKlassObj(info.elementBasicType()); arrayKlass = arrayKlass.arrayKlassOrNull(info.dimension()); v.visit(arrayKlass, probe.loader()); } } } } } }