Mercurial > hg > graal-jvmci-8
view agent/src/share/classes/sun/jvm/hotspot/gc_implementation/g1/HeapRegion.java @ 24234:ea6f94ab283b default tip
Added tag jvmci-0.36 for changeset 8128b98d4736
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Mon, 18 Sep 2017 18:49:45 +0200 |
parents | 1526a938e670 |
children |
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/* * Copyright (c) 2011, 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.ArrayList; import java.util.List; import java.util.Observable; import java.util.Observer; import sun.jvm.hotspot.debugger.Address; import sun.jvm.hotspot.memory.CompactibleSpace; import sun.jvm.hotspot.memory.MemRegion; import sun.jvm.hotspot.runtime.VM; 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 HeapRegion. Currently we don't actually include // any of its fields but only iterate over it. public class HeapRegion extends CompactibleSpace { // static int GrainBytes; static private CIntegerField grainBytesField; static private AddressField topField; 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("HeapRegion"); grainBytesField = type.getCIntegerField("GrainBytes"); topField = type.getAddressField("_top"); } static public long grainBytes() { return grainBytesField.getValue(); } public HeapRegion(Address addr) { super(addr); } public Address top() { return topField.getValue(addr); } @Override public List getLiveRegions() { List res = new ArrayList(); res.add(new MemRegion(bottom(), top())); return res; } @Override public long used() { return top().minus(bottom()); } @Override public long free() { return end().minus(top()); } }