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 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("ZAddressRangeMapForPageTable"); 43 44 mapField = type.getAddressField("_map"); 45 } 46 47 public ZAddressRangeMapForPageTable(Address addr) { 48 super(addr); 49 } 50 51 private Address map() { 52 return mapField.getValue(addr); 53 } 54 55 public long size() { 56 return ZGlobals.ZAddressOffsetMax >> ZGlobals.ZGranuleSizeShift; 57 } 58 59 private long index_for_addr(Address addr) { 60 long index = ZAddress.offset(addr) >> ZGlobals.ZGranuleSizeShift; 61 62 return index; 63 } 64 65 Address at(long index) { 66 return map().getAddressAt(index * VM.getVM().getBytesPerLong()); 67 } 68 69 Address get(Address addr) { 70 long index = index_for_addr(addr); 71 return at(index); 72 } 73 74 public class Iterator { 75 private long next = 0; 76 77 boolean hasNext() { 78 return next < size(); 79 } 80 81 Address next() { 82 if (next >= size()) { 83 throw new RuntimeException("OOIBE"); 84 } 85 86 return at(next++); 87 } 88 } 89 }