1 /* 2 * Copyright (c) 2018, 2019, 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.AddressField; 31 import sun.jvm.hotspot.types.Type; 32 import sun.jvm.hotspot.types.TypeDataBase; 33 34 public class ZAddressRangeMapForPageTable extends VMObject { 35 private static AddressField mapField; 36 37 private static long AddressRangeShift = ZGlobals.ZPageSizeMinShift; 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("ZAddressRangeMapForPageTable"); 45 46 mapField = type.getAddressField("_map"); 47 } 48 49 public ZAddressRangeMapForPageTable(Address addr) { 50 super(addr); 51 } 52 53 private Address map() { 54 return mapField.getValue(addr); 55 } 56 57 public long size() { 58 return ZGlobals.ZAddressOffsetMax >> AddressRangeShift; 59 } 60 61 private long index_for_addr(Address addr) { 62 long index = ZAddress.offset(addr) >> AddressRangeShift; 63 64 return index; 65 } 66 67 Address at(long index) { 68 return map().getAddressAt(index * VM.getVM().getBytesPerLong()); 69 } 70 71 Address get(Address addr) { 72 long index = index_for_addr(addr); 73 return at(index); 74 } 75 76 public class Iterator { 77 private long next = 0; 78 79 boolean hasNext() { 80 return next < size(); 81 } 82 83 Address next() { 84 if (next >= size()) { 85 throw new RuntimeException("OOIBE"); 86 } 87 88 return at(next++); 89 } 90 } 91 }