/*
* 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
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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);
}
}