1 /* 2 * Copyright (c) 2000, 2017, 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.*; 28 import java.util.*; 29 import sun.jvm.hotspot.debugger.*; 30 import sun.jvm.hotspot.gc.cms.CMSHeap; 31 import sun.jvm.hotspot.gc.serial.SerialHeap; 32 import sun.jvm.hotspot.gc.shared.*; 33 import sun.jvm.hotspot.gc.g1.G1CollectedHeap; 34 import sun.jvm.hotspot.gc.epsilon.EpsilonHeap; 35 import sun.jvm.hotspot.gc.parallel.*; 36 import sun.jvm.hotspot.oops.*; 37 import sun.jvm.hotspot.types.*; 38 import sun.jvm.hotspot.runtime.*; 39 40 41 public class Universe { 42 private static AddressField collectedHeapField; 43 private static VirtualConstructor heapConstructor; 44 private static sun.jvm.hotspot.types.OopField mainThreadGroupField; 45 private static sun.jvm.hotspot.types.OopField systemThreadGroupField; 46 47 // single dimensional primitive array klasses 48 private static sun.jvm.hotspot.types.AddressField boolArrayKlassField; 49 private static sun.jvm.hotspot.types.AddressField byteArrayKlassField; 50 private static sun.jvm.hotspot.types.AddressField charArrayKlassField; 51 private static sun.jvm.hotspot.types.AddressField intArrayKlassField; 52 private static sun.jvm.hotspot.types.AddressField shortArrayKlassField; 53 private static sun.jvm.hotspot.types.AddressField longArrayKlassField; 54 private static sun.jvm.hotspot.types.AddressField singleArrayKlassField; 55 private static sun.jvm.hotspot.types.AddressField doubleArrayKlassField; 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 synchronized void initialize(TypeDataBase db) { 77 Type type = db.lookupType("Universe"); 78 79 collectedHeapField = type.getAddressField("_collectedHeap"); 80 81 heapConstructor = new VirtualConstructor(db); 82 heapConstructor.addMapping("CMSHeap", CMSHeap.class); 83 heapConstructor.addMapping("SerialHeap", SerialHeap.class); 84 heapConstructor.addMapping("ParallelScavengeHeap", ParallelScavengeHeap.class); 85 heapConstructor.addMapping("G1CollectedHeap", G1CollectedHeap.class); 86 heapConstructor.addMapping("EpsilonHeap", EpsilonHeap.class); 87 88 mainThreadGroupField = type.getOopField("_main_thread_group"); 89 systemThreadGroupField = type.getOopField("_system_thread_group"); 90 91 boolArrayKlassField = type.getAddressField("_boolArrayKlassObj"); 92 byteArrayKlassField = type.getAddressField("_byteArrayKlassObj"); 93 charArrayKlassField = type.getAddressField("_charArrayKlassObj"); 94 intArrayKlassField = type.getAddressField("_intArrayKlassObj"); 95 shortArrayKlassField = type.getAddressField("_shortArrayKlassObj"); 96 longArrayKlassField = type.getAddressField("_longArrayKlassObj"); 97 singleArrayKlassField = type.getAddressField("_singleArrayKlassObj"); 98 doubleArrayKlassField = type.getAddressField("_doubleArrayKlassObj"); 99 100 narrowOopBaseField = type.getAddressField("_narrow_oop._base"); 101 narrowOopShiftField = type.getCIntegerField("_narrow_oop._shift"); 102 narrowKlassBaseField = type.getAddressField("_narrow_klass._base"); 103 narrowKlassShiftField = type.getCIntegerField("_narrow_klass._shift"); 104 105 UniverseExt.initialize(heapConstructor); 106 } 107 108 public Universe() { 109 } 110 public static String narrowOopModeToString(NARROW_OOP_MODE mode) { 111 switch (mode) { 112 case UnscaledNarrowOop: 113 return "32-bits Oops"; 114 case ZeroBasedNarrowOop: 115 return "zero based Compressed Oops"; 116 case HeapBasedNarrowOop: 117 return "Compressed Oops with base"; 118 } 119 return ""; 120 } 121 public CollectedHeap heap() { 122 return (CollectedHeap) heapConstructor.instantiateWrapperFor(collectedHeapField.getValue()); 123 } 124 125 public static long getNarrowOopBase() { 126 if (narrowOopBaseField.getValue() == null) { 127 return 0; 128 } else { 129 return narrowOopBaseField.getValue().minus(null); 130 } 131 } 132 133 public static int getNarrowOopShift() { 134 return (int)narrowOopShiftField.getValue(); 135 } 136 137 public static long getNarrowKlassBase() { 138 if (narrowKlassBaseField.getValue() == null) { 139 return 0; 140 } else { 141 return narrowKlassBaseField.getValue().minus(null); 142 } 143 } 144 145 public static int getNarrowKlassShift() { 146 return (int)narrowKlassShiftField.getValue(); 147 } 148 149 150 /** Returns "TRUE" iff "p" points into the allocated area of the heap. */ 151 public boolean isIn(Address p) { 152 return heap().isIn(p); 153 } 154 155 /** Returns "TRUE" iff "p" points into the reserved area of the heap. */ 156 public boolean isInReserved(Address p) { 157 return heap().isInReserved(p); 158 } 159 160 private Oop newOop(OopHandle handle) { 161 return VM.getVM().getObjectHeap().newOop(handle); 162 } 163 164 public Oop mainThreadGroup() { 165 return newOop(mainThreadGroupField.getValue()); 166 } 167 168 public Oop systemThreadGroup() { 169 return newOop(systemThreadGroupField.getValue()); 170 } 171 172 173 public void print() { printOn(System.out); } 174 public void printOn(PrintStream tty) { 175 heap().printOn(tty); 176 } 177 178 // Check whether an element of a typeArrayOop with the given type must be 179 // aligned 0 mod 8. The typeArrayOop itself must be aligned at least this 180 // strongly. 181 public static boolean elementTypeShouldBeAligned(BasicType type) { 182 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG; 183 } 184 185 // Check whether an object field (static/non-static) of the given type must be 186 // aligned 0 mod 8. 187 public static boolean fieldTypeShouldBeAligned(BasicType type) { 188 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG; 189 } 190 }