Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/gc_implementation/g1/HeapRegionSeq.java @ 11997:cd25d3be91c5
8012144: multiple SIGSEGVs fails on staxf
Summary: Forward port of 7u change to add additional fence() on RMO platforms, with a load_acquire on all platforms
Reviewed-by: dholmes, kvn
author | vladidan |
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date | Tue, 06 Aug 2013 20:01:40 -0400 |
parents | 720b6a76dd9d |
children | 9e5fadad7fdf |
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/* * Copyright (c) 2011, 2012, 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.gc_implementation.g1; import java.util.Iterator; import java.util.Observable; import java.util.Observer; import sun.jvm.hotspot.debugger.Address; import sun.jvm.hotspot.runtime.VM; import sun.jvm.hotspot.runtime.VMObject; import sun.jvm.hotspot.runtime.VMObjectFactory; import sun.jvm.hotspot.types.AddressField; import sun.jvm.hotspot.types.CIntegerField; import sun.jvm.hotspot.types.Type; import sun.jvm.hotspot.types.TypeDataBase; // Mirror class for HeapRegionSeq. It's essentially an index -> HeapRegion map. public class HeapRegionSeq extends VMObject { // HeapRegion** _regions; static private AddressField regionsField; // uint _length; static private CIntegerField lengthField; static { VM.registerVMInitializedObserver(new Observer() { public void update(Observable o, Object data) { initialize(VM.getVM().getTypeDataBase()); } }); } static private synchronized void initialize(TypeDataBase db) { Type type = db.lookupType("HeapRegionSeq"); regionsField = type.getAddressField("_regions"); lengthField = type.getCIntegerField("_length"); } private HeapRegion at(long index) { Address arrayAddr = regionsField.getValue(addr); // Offset of &_region[index] long offset = index * VM.getVM().getAddressSize(); Address regionAddr = arrayAddr.getAddressAt(offset); return (HeapRegion) VMObjectFactory.newObject(HeapRegion.class, regionAddr); } public long length() { return lengthField.getValue(addr); } private class HeapRegionIterator implements Iterator<HeapRegion> { private long index; private long length; @Override public boolean hasNext() { return index < length; } @Override public HeapRegion next() { return at(index++); } @Override public void remove() { /* not supported */ } HeapRegionIterator(Address addr) { index = 0; length = length(); } } public Iterator<HeapRegion> heapRegionIterator() { return new HeapRegionIterator(addr); } public HeapRegionSeq(Address addr) { super(addr); } }