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