1 /* 2 * Copyright (c) 2000, 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.memory; 26 27 import java.io.PrintStream; 28 import java.util.Observable; 29 import java.util.Observer; 30 31 import sun.jvm.hotspot.debugger.Address; 32 import sun.jvm.hotspot.debugger.OopHandle; 33 import sun.jvm.hotspot.gc.cms.CMSHeap; 34 import sun.jvm.hotspot.gc.epsilon.EpsilonHeap; 35 import sun.jvm.hotspot.gc.g1.G1CollectedHeap; 36 import sun.jvm.hotspot.gc.parallel.ParallelScavengeHeap; 37 import sun.jvm.hotspot.gc.serial.SerialHeap; 38 import sun.jvm.hotspot.gc.shared.CollectedHeap; 39 import sun.jvm.hotspot.gc.shenandoah.ShenandoahHeap; 40 import sun.jvm.hotspot.gc.z.ZCollectedHeap; 41 import sun.jvm.hotspot.oops.Oop; 42 import sun.jvm.hotspot.runtime.BasicType; 43 import sun.jvm.hotspot.runtime.VM; 44 import sun.jvm.hotspot.runtime.VirtualConstructor; 45 import sun.jvm.hotspot.types.AddressField; 46 import sun.jvm.hotspot.types.CIntegerField; 47 import sun.jvm.hotspot.types.Type; 48 import sun.jvm.hotspot.types.TypeDataBase; 49 50 51 public class Universe { 52 private static AddressField collectedHeapField; 53 private static VirtualConstructor heapConstructor; 54 private static sun.jvm.hotspot.types.OopField mainThreadGroupField; 55 private static sun.jvm.hotspot.types.OopField systemThreadGroupField; 56 57 private static AddressField narrowOopBaseField; 58 private static CIntegerField narrowOopShiftField; 59 private static AddressField narrowKlassBaseField; 60 private static CIntegerField narrowKlassShiftField; 61 62 public enum NARROW_OOP_MODE { 63 UnscaledNarrowOop, 64 ZeroBasedNarrowOop, 65 HeapBasedNarrowOop 66 } 67 68 static { 69 VM.registerVMInitializedObserver(new Observer() { 70 public void update(Observable o, Object data) { 71 initialize(VM.getVM().getTypeDataBase()); 72 } 73 }); 74 } 75 76 private static boolean typeExists(TypeDataBase db, String type) { 77 try { 78 db.lookupType(type); 79 } catch (RuntimeException e) { 80 return false; 81 } 82 return true; 83 } 84 85 private static void addHeapTypeIfInDB(TypeDataBase db, Class heapClass) { 86 String heapName = heapClass.getSimpleName(); 87 if (typeExists(db, heapName)) { 88 heapConstructor.addMapping(heapName, heapClass); 89 } 90 } 91 92 private static synchronized void initialize(TypeDataBase db) { 93 Type type = db.lookupType("Universe"); 94 95 collectedHeapField = type.getAddressField("_collectedHeap"); 96 97 heapConstructor = new VirtualConstructor(db); 98 addHeapTypeIfInDB(db, CMSHeap.class); 99 addHeapTypeIfInDB(db, SerialHeap.class); 100 addHeapTypeIfInDB(db, ParallelScavengeHeap.class); 101 addHeapTypeIfInDB(db, G1CollectedHeap.class); 102 addHeapTypeIfInDB(db, EpsilonHeap.class); 103 addHeapTypeIfInDB(db, ZCollectedHeap.class); 104 addHeapTypeIfInDB(db, ShenandoahHeap.class); 105 106 mainThreadGroupField = type.getOopField("_main_thread_group"); 107 systemThreadGroupField = type.getOopField("_system_thread_group"); 108 109 narrowOopBaseField = type.getAddressField("_narrow_oop._base"); 110 narrowOopShiftField = type.getCIntegerField("_narrow_oop._shift"); 111 narrowKlassBaseField = type.getAddressField("_narrow_klass._base"); 112 narrowKlassShiftField = type.getCIntegerField("_narrow_klass._shift"); 113 114 UniverseExt.initialize(heapConstructor); 115 } 116 117 public Universe() { 118 } 119 public static String narrowOopModeToString(NARROW_OOP_MODE mode) { 120 switch (mode) { 121 case UnscaledNarrowOop: 122 return "32-bits Oops"; 123 case ZeroBasedNarrowOop: 124 return "zero based Compressed Oops"; 125 case HeapBasedNarrowOop: 126 return "Compressed Oops with base"; 127 } 128 return ""; 129 } 130 public CollectedHeap heap() { 131 return (CollectedHeap) heapConstructor.instantiateWrapperFor(collectedHeapField.getValue()); 132 } 133 134 public static long getNarrowOopBase() { 135 if (narrowOopBaseField.getValue() == null) { 136 return 0; 137 } else { 138 return narrowOopBaseField.getValue().minus(null); 139 } 140 } 141 142 public static int getNarrowOopShift() { 143 return (int)narrowOopShiftField.getValue(); 144 } 145 146 public static long getNarrowKlassBase() { 147 if (narrowKlassBaseField.getValue() == null) { 148 return 0; 149 } else { 150 return narrowKlassBaseField.getValue().minus(null); 151 } 152 } 153 154 public static int getNarrowKlassShift() { 155 return (int)narrowKlassShiftField.getValue(); 156 } 157 158 159 /** Returns "TRUE" iff "p" points into the allocated area of the heap. */ 160 public boolean isIn(Address p) { 161 return heap().isIn(p); 162 } 163 164 /** Returns "TRUE" iff "p" points into the reserved area of the heap. */ 165 public boolean isInReserved(Address p) { 166 return heap().isInReserved(p); 167 } 168 169 private Oop newOop(OopHandle handle) { 170 return VM.getVM().getObjectHeap().newOop(handle); 171 } 172 173 public Oop mainThreadGroup() { 174 return newOop(mainThreadGroupField.getValue()); 175 } 176 177 public Oop systemThreadGroup() { 178 return newOop(systemThreadGroupField.getValue()); 179 } 180 181 182 public void print() { printOn(System.out); } 183 public void printOn(PrintStream tty) { 184 heap().printOn(tty); 185 } 186 187 // Check whether an element of a typeArrayOop with the given type must be 188 // aligned 0 mod 8. The typeArrayOop itself must be aligned at least this 189 // strongly. 190 public static boolean elementTypeShouldBeAligned(BasicType type) { 191 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG; 192 } 193 194 // Check whether an object field (static/non-static) of the given type must be 195 // aligned 0 mod 8. 196 public static boolean fieldTypeShouldBeAligned(BasicType type) { 197 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG; 198 } 199 }