1/* 2 * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25package sun.jvm.hotspot.gc.parallel; 26 27import java.io.*; 28import java.util.*; 29 30import sun.jvm.hotspot.debugger.*; 31import sun.jvm.hotspot.memory.*; 32import sun.jvm.hotspot.runtime.*; 33import sun.jvm.hotspot.types.*; 34 35public class MutableSpace extends ImmutableSpace { 36 static { 37 VM.registerVMInitializedObserver(new Observer() { 38 public void update(Observable o, Object data) { 39 initialize(VM.getVM().getTypeDataBase()); 40 } 41 }); 42 } 43 44 private static synchronized void initialize(TypeDataBase db) { 45 Type type = db.lookupType("MutableSpace"); 46 topField = type.getAddressField("_top"); 47 } 48 49 public MutableSpace(Address addr) { 50 super(addr); 51 } 52 53 // Fields 54 private static AddressField topField; 55 56 // Accessors 57 public Address top() { return topField.getValue(addr); } 58 59 /** In bytes */ 60 public long used() { 61 return top().minus(bottom()); 62 } 63 64 /** returns all MemRegions where live objects are */ 65 public List/*<MemRegion>*/ getLiveRegions() { 66 List res = new ArrayList(); 67 res.add(new MemRegion(bottom(), top())); 68 return res; 69 } 70 71 public void printOn(PrintStream tty) { 72 tty.print(" [" + bottom() + "," + 73 top() + "," + end() + "] "); 74 } 75} 76