1 /* 2 * Copyright (c) 2017, 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.g1; 26 27 import java.util.Observable; 28 import java.util.Observer; 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.types.CIntegerField; 33 import sun.jvm.hotspot.types.Type; 34 import sun.jvm.hotspot.types.TypeDataBase; 35 36 // Mirror class for HeapRegionType. Currently we don't actually include 37 // any of its fields but only iterate over it. 38 39 public class HeapRegionType extends VMObject { 40 41 private static int freeTag; 42 private static int youngMask; 43 private static int edenTag; 44 private static int survTag; 45 private static int humongousMask; 46 private static int startsHumongousTag; 47 private static int continuesHumongousTag; 48 private static int pinnedMask; 49 private static int archiveMask; 50 private static int oldMask; 51 private static int preMatureOldMask; 52 private static CIntegerField tagField; 53 private int tag; 54 55 static { 56 VM.registerVMInitializedObserver(new Observer() { 57 public void update(Observable o, Object data) { 58 initialize(VM.getVM().getTypeDataBase()); 59 } 60 }); 61 } 62 63 private static synchronized void initialize(TypeDataBase db) { 64 Type type = db.lookupType("HeapRegionType"); 65 66 tagField = type.getCIntegerField("_tag"); 67 68 freeTag = db.lookupIntConstant("HeapRegionType::FreeTag"); 69 youngMask = db.lookupIntConstant("HeapRegionType::YoungMask"); 70 edenTag = db.lookupIntConstant("HeapRegionType::EdenTag"); 71 survTag = db.lookupIntConstant("HeapRegionType::SurvTag"); 72 startsHumongousTag = db.lookupIntConstant("HeapRegionType::StartsHumongousTag"); 73 continuesHumongousTag = db.lookupIntConstant("HeapRegionType::ContinuesHumongousTag"); 74 archiveMask = db.lookupIntConstant("HeapRegionType::ArchiveMask"); 75 humongousMask = db.lookupIntConstant("HeapRegionType::HumongousMask"); 76 pinnedMask = db.lookupIntConstant("HeapRegionType::PinnedMask"); 77 oldMask = db.lookupIntConstant("HeapRegionType::OldMask"); 78 preMatureOldMask = db.lookupIntConstant("HeapRegionType::PreMatureOldMask"); 79 } 80 81 public boolean isFree() { 82 return tagField.getValue(addr) == freeTag; 83 } 84 85 public boolean isEden() { 86 return tagField.getValue(addr) == edenTag; 87 } 88 89 public boolean isSurvivor() { 90 return tagField.getValue(addr) == survTag; 91 } 92 93 public boolean isYoung() { 94 return (tagField.getValue(addr) & youngMask) != 0; 95 } 96 97 public boolean isHumongous() { 98 return (tagField.getValue(addr) & humongousMask) != 0; 99 } 100 101 public boolean isStartsHumongous() { 102 return tagField.getValue(addr) == startsHumongousTag; 103 } 104 105 public boolean isContinuesHumongous() { 106 return tagField.getValue(addr) == continuesHumongousTag; 107 } 108 109 public boolean isArchive() { 110 return (tagField.getValue(addr) & archiveMask) != 0; 111 } 112 113 public boolean isPinned() { 114 return (tagField.getValue(addr) & pinnedMask) != 0; 115 } 116 117 public boolean isOld() { 118 return (tagField.getValue(addr) & oldMask) != 0; 119 } 120 121 public boolean isPreMatureOld() { 122 return (tagField.getValue(addr) & preMatureOldMask) != 0; 123 } 124 125 public HeapRegionType(Address addr) { 126 super(addr); 127 } 128 129 public String typeAnnotation() { 130 if (isFree()) { 131 return "Free"; 132 } 133 if (isEden()) { 134 return "Eden"; 135 } 136 if (isSurvivor()) { 137 return "Survivor"; 138 } 139 if (isStartsHumongous()) { 140 return "StartsHumongous"; 141 } 142 if (isContinuesHumongous()) { 143 return "ContinuesHumongous"; 144 } 145 if (isArchive()) { 146 return "Archive"; 147 } 148 if (isPinned()) { 149 return "Pinned"; 150 } 151 if (isOld()) { 152 return "Old"; 153 } 154 if (isPreMatureOld()) { 155 return "PreMature Old"; 156 } 157 return "Unknown Region Type"; 158 } 159 }