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.parallel.*; 35 import sun.jvm.hotspot.oops.*; 36 import sun.jvm.hotspot.types.*; 37 import sun.jvm.hotspot.runtime.*; 38 39 40 public class Universe { 41 private static AddressField collectedHeapField; 42 private static VirtualConstructor heapConstructor; 43 private static sun.jvm.hotspot.types.OopField mainThreadGroupField; 44 private static sun.jvm.hotspot.types.OopField systemThreadGroupField; 45 46 // single dimensional primitive array klasses 47 private static sun.jvm.hotspot.types.AddressField boolArrayKlassField; 48 private static sun.jvm.hotspot.types.AddressField byteArrayKlassField; 49 private static sun.jvm.hotspot.types.AddressField charArrayKlassField; 50 private static sun.jvm.hotspot.types.AddressField intArrayKlassField; 51 private static sun.jvm.hotspot.types.AddressField shortArrayKlassField; 52 private static sun.jvm.hotspot.types.AddressField longArrayKlassField; 53 private static sun.jvm.hotspot.types.AddressField singleArrayKlassField; 54 private static sun.jvm.hotspot.types.AddressField doubleArrayKlassField; 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 synchronized void initialize(TypeDataBase db) { 76 Type type = db.lookupType("Universe"); 77 78 collectedHeapField = type.getAddressField("_collectedHeap"); 79 80 heapConstructor = new VirtualConstructor(db); 81 heapConstructor.addMapping("CMSHeap", CMSHeap.class); 82 heapConstructor.addMapping("SerialHeap", SerialHeap.class); 83 heapConstructor.addMapping("ParallelScavengeHeap", ParallelScavengeHeap.class); 84 heapConstructor.addMapping("G1CollectedHeap", G1CollectedHeap.class); 85 86 mainThreadGroupField = type.getOopField("_main_thread_group"); 87 systemThreadGroupField = type.getOopField("_system_thread_group"); 88 89 boolArrayKlassField = type.getAddressField("_boolArrayKlassObj"); 90 byteArrayKlassField = type.getAddressField("_byteArrayKlassObj"); 91 charArrayKlassField = type.getAddressField("_charArrayKlassObj"); 92 intArrayKlassField = type.getAddressField("_intArrayKlassObj"); 93 shortArrayKlassField = type.getAddressField("_shortArrayKlassObj"); 94 longArrayKlassField = type.getAddressField("_longArrayKlassObj"); 95 singleArrayKlassField = type.getAddressField("_singleArrayKlassObj"); 96 doubleArrayKlassField = type.getAddressField("_doubleArrayKlassObj"); 97 98 narrowOopBaseField = type.getAddressField("_narrow_oop._base"); 99 narrowOopShiftField = type.getCIntegerField("_narrow_oop._shift"); 100 narrowKlassBaseField = type.getAddressField("_narrow_klass._base"); 101 narrowKlassShiftField = type.getCIntegerField("_narrow_klass._shift"); 102 103 UniverseExt.initialize(heapConstructor); 104 } 105 106 public Universe() { 107 } 108 public static String narrowOopModeToString(NARROW_OOP_MODE mode) { 109 switch (mode) { 110 case UnscaledNarrowOop: 111 return "32-bits Oops"; 112 case ZeroBasedNarrowOop: 113 return "zero based Compressed Oops"; 114 case HeapBasedNarrowOop: 115 return "Compressed Oops with base"; 116 } 117 return ""; 118 } 119 public CollectedHeap heap() { 120 return (CollectedHeap) heapConstructor.instantiateWrapperFor(collectedHeapField.getValue()); 121 } 122 123 public static long getNarrowOopBase() { 124 if (narrowOopBaseField.getValue() == null) { 125 return 0; 126 } else { 127 return narrowOopBaseField.getValue().minus(null); 128 } 129 } 130 131 public static int getNarrowOopShift() { 132 return (int)narrowOopShiftField.getValue(); 133 } 134 135 public static long getNarrowKlassBase() { 136 if (narrowKlassBaseField.getValue() == null) { 137 return 0; 138 } else { 139 return narrowKlassBaseField.getValue().minus(null); 140 } 141 } 142 143 public static int getNarrowKlassShift() { 144 return (int)narrowKlassShiftField.getValue(); 145 } 146 147 148 /** Returns "TRUE" iff "p" points into the allocated area of the heap. */ 149 public boolean isIn(Address p) { 150 return heap().isIn(p); 151 } 152 153 /** Returns "TRUE" iff "p" points into the reserved area of the heap. */ 154 public boolean isInReserved(Address p) { 155 return heap().isInReserved(p); 156 } 157 158 private Oop newOop(OopHandle handle) { 159 return VM.getVM().getObjectHeap().newOop(handle); 160 } 161 162 public Oop mainThreadGroup() { 163 return newOop(mainThreadGroupField.getValue()); 164 } 165 166 public Oop systemThreadGroup() { 167 return newOop(systemThreadGroupField.getValue()); 168 } 169 170 171 public void print() { printOn(System.out); } 172 public void printOn(PrintStream tty) { 173 heap().printOn(tty); 174 } 175 176 // Check whether an element of a typeArrayOop with the given type must be 177 // aligned 0 mod 8. The typeArrayOop itself must be aligned at least this 178 // strongly. 179 public static boolean elementTypeShouldBeAligned(BasicType type) { 180 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG; 181 } 182 183 // Check whether an object field (static/non-static) of the given type must be 184 // aligned 0 mod 8. 185 public static boolean fieldTypeShouldBeAligned(BasicType type) { 186 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG; 187 } 188 }