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 CIntegerField tagField; 52 private int tag; 53 54 static { 55 VM.registerVMInitializedObserver(new Observer() { 56 public void update(Observable o, Object data) { 57 initialize(VM.getVM().getTypeDataBase()); 58 } 59 }); 60 } 61 62 private static synchronized void initialize(TypeDataBase db) { 63 Type type = db.lookupType("HeapRegionType"); 64 65 tagField = type.getCIntegerField("_tag"); 66 67 freeTag = db.lookupIntConstant("HeapRegionType::FreeTag"); 68 youngMask = db.lookupIntConstant("HeapRegionType::YoungMask"); 69 edenTag = db.lookupIntConstant("HeapRegionType::EdenTag"); 70 survTag = db.lookupIntConstant("HeapRegionType::SurvTag"); 71 startsHumongousTag = db.lookupIntConstant("HeapRegionType::StartsHumongousTag"); 72 continuesHumongousTag = db.lookupIntConstant("HeapRegionType::ContinuesHumongousTag"); 73 archiveMask = db.lookupIntConstant("HeapRegionType::ArchiveMask"); 74 humongousMask = db.lookupIntConstant("HeapRegionType::HumongousMask"); 75 pinnedMask = db.lookupIntConstant("HeapRegionType::PinnedMask"); 76 oldMask = db.lookupIntConstant("HeapRegionType::OldMask"); 77 } 78 79 public boolean isFree() { 80 return tagField.getValue(addr) == freeTag; 81 } 82 83 public boolean isEden() { 84 return tagField.getValue(addr) == edenTag; 85 } 86 87 public boolean isSurvivor() { 88 return tagField.getValue(addr) == survTag; 89 } 90 91 public boolean isYoung() { 92 return (tagField.getValue(addr) & youngMask) != 0; 93 } 94 95 public boolean isHumongous() { 96 return (tagField.getValue(addr) & humongousMask) != 0; 97 } 98 99 public boolean isStartsHumongous() { 100 return tagField.getValue(addr) == startsHumongousTag; 101 } 102 103 public boolean isContinuesHumongous() { 104 return tagField.getValue(addr) == continuesHumongousTag; 105 } 106 107 public boolean isArchive() { 108 return (tagField.getValue(addr) & archiveMask) != 0; 109 } 110 111 public boolean isPinned() { 112 return (tagField.getValue(addr) & pinnedMask) != 0; 113 } 114 115 public boolean isOld() { 116 return (tagField.getValue(addr) & oldMask) != 0; 117 } 118 119 public HeapRegionType(Address addr) { 120 super(addr); 121 } 122 123 public String typeAnnotation() { 124 if (isFree()) { 125 return "Free"; 126 } 127 if (isEden()) { 128 return "Eden"; 129 } 130 if (isSurvivor()) { 131 return "Survivor"; 132 } 133 if (isStartsHumongous()) { 134 return "StartsHumongous"; 135 } 136 if (isContinuesHumongous()) { 137 return "ContinuesHumongous"; 138 } 139 if (isArchive()) { 140 return "Archive"; 141 } 142 if (isPinned()) { 143 return "Pinned"; 144 } 145 if (isOld()) { 146 return "Old"; 147 } 148 return "Unknown Region Type"; 149 } 150 }