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