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