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 java.util.function.Consumer; 28 29 import sun.jvm.hotspot.debugger.Address; 30 import sun.jvm.hotspot.runtime.VM; 31 import sun.jvm.hotspot.runtime.VMObject; 32 import sun.jvm.hotspot.runtime.VMObjectFactory; 33 import sun.jvm.hotspot.types.Type; 34 import sun.jvm.hotspot.types.TypeDataBase; 35 36 public class ZPageTable extends VMObject { 37 private static long mapFieldOffset; 38 39 static { 40 VM.registerVMInitializedObserver((o, d) -> initialize(VM.getVM().getTypeDataBase())); 41 } 42 43 static private synchronized void initialize(TypeDataBase db) { 44 Type type = db.lookupType("ZPageTable"); 45 46 mapFieldOffset = type.getAddressField("_map").getOffset(); 47 } 48 49 public ZPageTable(Address addr) { 50 super(addr); 51 } 52 53 private ZAddressRangeMapForPageTable map() { 54 return (ZAddressRangeMapForPageTable)VMObjectFactory.newObject(ZAddressRangeMapForPageTable.class, addr.addOffsetTo(mapFieldOffset)); 55 } 56 57 private ZPageTableEntry getEntry(Address o) { 58 return new ZPageTableEntry(map().get(o)); 59 } 60 61 private ZPageTableEntry getEntry(long index) { 62 return new ZPageTableEntry(map().get(index)); 63 } 64 65 ZPage get(Address o) { 66 return getEntry(o).page(); 67 } 68 69 boolean is_relocating(Address o) { 70 return getEntry(o).relocating(); 71 } 72 73 public void pageTableIterate(Consumer<ZPage> consumer) { 74 ZPage prev = null; 75 for (long index = 0L; index < map().size(); index++) { 76 var pageEntry = getEntry(index); 77 if (pageEntry.entry != null) { 78 var page = pageEntry.page(); 79 if (!page.equals(prev)) { 80 consumer.accept(page); 81 prev = page; 82 } 83 } 84 } 85 } 86 }