1 /* 2 * Copyright (c) 2000, 2002, 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 25 package sun.jvm.hotspot.runtime; 26 27 import java.util.*; 28 import sun.jvm.hotspot.debugger.*; 29 import sun.jvm.hotspot.types.*; 30 31 public class VirtualSpace extends VMObject { 32 private static AddressField lowField; 33 private static AddressField highField; 34 private static AddressField lowBoundaryField; 35 private static AddressField highBoundaryField; 36 37 static { 38 VM.registerVMInitializedObserver(new Observer() { 39 public void update(Observable o, Object data) { 40 initialize(VM.getVM().getTypeDataBase()); 41 } 42 }); 43 } 44 45 private static synchronized void initialize(TypeDataBase db) { 46 Type type = db.lookupType("VirtualSpace"); 47 48 lowField = type.getAddressField("_low"); 49 highField = type.getAddressField("_high"); 50 lowBoundaryField = type.getAddressField("_low_boundary"); 51 highBoundaryField = type.getAddressField("_high_boundary"); 52 } 53 54 public VirtualSpace(Address addr) { 55 super(addr); 56 } 57 58 public Address low() { return lowField.getValue(addr); } 59 public Address high() { return highField.getValue(addr); } 60 public Address lowBoundary() { return lowBoundaryField.getValue(addr); } 61 public Address highBoundary() { return highBoundaryField.getValue(addr); } 62 63 /** Testers (all sizes are byte sizes) */ 64 public long committedSize() { return high().minus(low()); } 65 public long reservedSize() { return highBoundary().minus(lowBoundary()); } 66 public long uncommittedSize() { return reservedSize() - committedSize(); } 67 public boolean contains(Address addr) { return (low().lessThanOrEqual(addr) && addr.lessThan(high())); } 68 }