1 /* 2 * Copyright (c) 2018, 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.gc.z; 26 27 import sun.jvm.hotspot.debugger.Address; 28 import sun.jvm.hotspot.runtime.VM; 29 import sun.jvm.hotspot.runtime.VMObject; 30 import sun.jvm.hotspot.types.CIntegerField; 31 import sun.jvm.hotspot.types.Type; 32 import sun.jvm.hotspot.types.TypeDataBase; 33 34 public class ZVirtualMemory extends VMObject { 35 private static CIntegerField startField; 36 private static CIntegerField endField; 37 38 static { 39 VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase())); 40 } 41 42 static private synchronized void initialize(TypeDataBase db) { 43 Type type = db.lookupType("ZVirtualMemory"); 44 45 startField = type.getCIntegerField("_start"); 46 endField = type.getCIntegerField("_end"); 47 } 48 49 public ZVirtualMemory(Address addr) { 50 super(addr); 51 } 52 53 long start() { 54 return startField.getJLong(addr); 55 } 56 57 long end() { 58 return endField.getJLong(addr); 59 } 60 }