/*
* Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.
* 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.epsilon;
import java.io.*;
import java.util.*;
import sun.jvm.hotspot.gc.shared.CollectedHeap;
import sun.jvm.hotspot.gc.shared.CollectedHeapName;
import sun.jvm.hotspot.code.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.memory.*;
public class EpsilonHeap extends CollectedHeap {
private static Field spaceField;
private VirtualSpace space;
static {
VM.registerVMInitializedObserver(new Observer() {
public void update(Observable o, Object data) {
initialize(VM.getVM().getTypeDataBase());
}
});
}
private static void initialize(TypeDataBase db) {
Type type = db.lookupType("EpsilonHeap");
spaceField = type.getField("_virtual_space");
}
public EpsilonHeap(Address addr) {
super(addr);
space = new VirtualSpace(addr.addOffsetTo(spaceField.getOffset()));
}
@Override
public CollectedHeapName kind() {
return CollectedHeapName.EPSILON;
}
public VirtualSpace space() {
return space;
}
@Override
public void printOn(PrintStream tty) {
MemRegion mr = reservedRegion();
tty.println("Epsilon heap");
tty.println(" reserved: [" + mr.start() + ", " + mr.end() + "]");
tty.println(" committed: [" + space.low() + ", " + space.high() + "]");
}
}