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.runtime.VMObjectFactory; 31 import sun.jvm.hotspot.types.Type; 32 import sun.jvm.hotspot.types.TypeDataBase; 33 34 public class ZPageTable extends VMObject { 35 private static long mapFieldOffset; 36 37 static { 38 VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase())); 39 } 40 41 static private synchronized void initialize(TypeDataBase db) { 42 Type type = db.lookupType("ZPageTable"); 43 44 mapFieldOffset = type.getAddressField("_map").getOffset(); 45 } 46 47 public ZPageTable(Address addr) { 48 super(addr); 49 } 50 51 private ZAddressRangeMapForPageTable map() { 52 return (ZAddressRangeMapForPageTable)VMObjectFactory.newObject(ZAddressRangeMapForPageTable.class, addr.addOffsetTo(mapFieldOffset)); 53 } 54 55 private ZPageTableEntry getEntry(Address o) { 56 return new ZPageTableEntry(map().get(o)); 57 } 58 59 ZPage get(Address o) { 60 return getEntry(o).page(); 61 } 62 63 boolean is_relocating(Address o) { 64 return getEntry(o).relocating(); 65 } 66 }