1 /* 2 * Copyright (c) 2000, 2015, 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_interface.*; 31 import sun.jvm.hotspot.gc_implementation.g1.G1CollectedHeap; 32 import sun.jvm.hotspot.gc_implementation.parallelScavenge.*; 33 import sun.jvm.hotspot.oops.*; 34 import sun.jvm.hotspot.types.*; 35 import sun.jvm.hotspot.runtime.*; 36 37 38 public class Universe { 39 private static AddressField collectedHeapField; 40 private static VirtualConstructor heapConstructor; 41 private static sun.jvm.hotspot.types.OopField mainThreadGroupField; 42 private static sun.jvm.hotspot.types.OopField systemThreadGroupField; 43 44 // single dimensional primitive array klasses 45 private static sun.jvm.hotspot.types.AddressField boolArrayKlassField; 46 private static sun.jvm.hotspot.types.AddressField byteArrayKlassField; 47 private static sun.jvm.hotspot.types.AddressField charArrayKlassField; 48 private static sun.jvm.hotspot.types.AddressField intArrayKlassField; 49 private static sun.jvm.hotspot.types.AddressField shortArrayKlassField; 50 private static sun.jvm.hotspot.types.AddressField longArrayKlassField; 51 private static sun.jvm.hotspot.types.AddressField singleArrayKlassField; 52 private static sun.jvm.hotspot.types.AddressField doubleArrayKlassField; 53 54 private static AddressField narrowOopBaseField; 55 private static CIntegerField narrowOopShiftField; 56 private static AddressField narrowKlassBaseField; 57 private static CIntegerField narrowKlassShiftField; 58 59 public enum NARROW_OOP_MODE { 60 UnscaledNarrowOop, 61 ZeroBasedNarrowOop, 62 HeapBasedNarrowOop 63 } 64 65 static { 66 VM.registerVMInitializedObserver(new Observer() { 67 public void update(Observable o, Object data) { 68 initialize(VM.getVM().getTypeDataBase()); 69 } 70 }); 71 } 72 73 private static synchronized void initialize(TypeDataBase db) { 74 Type type = db.lookupType("Universe"); 75 76 collectedHeapField = type.getAddressField("_collectedHeap"); 77 78 heapConstructor = new VirtualConstructor(db); 79 heapConstructor.addMapping("GenCollectedHeap", GenCollectedHeap.class); 80 heapConstructor.addMapping("ParallelScavengeHeap", ParallelScavengeHeap.class); 81 heapConstructor.addMapping("G1CollectedHeap", G1CollectedHeap.class); 82 83 mainThreadGroupField = type.getOopField("_main_thread_group"); 84 systemThreadGroupField = type.getOopField("_system_thread_group"); 85 86 boolArrayKlassField = type.getAddressField("_boolArrayKlassObj"); 87 byteArrayKlassField = type.getAddressField("_byteArrayKlassObj"); 88 charArrayKlassField = type.getAddressField("_charArrayKlassObj"); 89 intArrayKlassField = type.getAddressField("_intArrayKlassObj"); 90 shortArrayKlassField = type.getAddressField("_shortArrayKlassObj"); 91 longArrayKlassField = type.getAddressField("_longArrayKlassObj"); 92 singleArrayKlassField = type.getAddressField("_singleArrayKlassObj"); 93 doubleArrayKlassField = type.getAddressField("_doubleArrayKlassObj"); 94 95 narrowOopBaseField = type.getAddressField("_narrow_oop._base"); 96 narrowOopShiftField = type.getCIntegerField("_narrow_oop._shift"); 97 narrowKlassBaseField = type.getAddressField("_narrow_klass._base"); 98 narrowKlassShiftField = type.getCIntegerField("_narrow_klass._shift"); 99 } 100 101 public Universe() { 102 } 103 public static String narrowOopModeToString(NARROW_OOP_MODE mode) { 104 switch (mode) { 105 case UnscaledNarrowOop: 106 return "32-bits Oops"; 107 case ZeroBasedNarrowOop: 108 return "zero based Compressed Oops"; 109 case HeapBasedNarrowOop: 110 return "Compressed Oops with base"; 111 } 112 return ""; 113 } 114 public CollectedHeap heap() { 115 return (CollectedHeap) heapConstructor.instantiateWrapperFor(collectedHeapField.getValue()); 116 } 117 118 public static long getNarrowOopBase() { 119 if (narrowOopBaseField.getValue() == null) { 120 return 0; 121 } else { 122 return narrowOopBaseField.getValue().minus(null); 123 } 124 } 125 126 public static int getNarrowOopShift() { 127 return (int)narrowOopShiftField.getValue(); 128 } 129 130 public static long getNarrowKlassBase() { 131 if (narrowKlassBaseField.getValue() == null) { 132 return 0; 133 } else { 134 return narrowKlassBaseField.getValue().minus(null); 135 } 136 } 137 138 public static int getNarrowKlassShift() { 139 return (int)narrowKlassShiftField.getValue(); 140 } 141 142 143 /** Returns "TRUE" iff "p" points into the allocated area of the heap. */ 144 public boolean isIn(Address p) { 145 return heap().isIn(p); 146 } 147 148 /** Returns "TRUE" iff "p" points into the reserved area of the heap. */ 149 public boolean isInReserved(Address p) { 150 return heap().isInReserved(p); 151 } 152 153 private Oop newOop(OopHandle handle) { 154 return VM.getVM().getObjectHeap().newOop(handle); 155 } 156 157 public Oop mainThreadGroup() { 158 return newOop(mainThreadGroupField.getValue()); 159 } 160 161 public Oop systemThreadGroup() { 162 return newOop(systemThreadGroupField.getValue()); 163 } 164 165 // iterate through the single dimensional primitive array klasses 166 // refer to basic_type_classes_do(void f(Klass*)) in universe.cpp 167 public void basicTypeClassesDo(SystemDictionary.ClassVisitor visitor) { 168 visitor.visit(new TypeArrayKlass(boolArrayKlassField.getValue())); 169 visitor.visit(new TypeArrayKlass(byteArrayKlassField.getValue())); 170 visitor.visit(new TypeArrayKlass(charArrayKlassField.getValue())); 171 visitor.visit(new TypeArrayKlass(intArrayKlassField.getValue())); 172 visitor.visit(new TypeArrayKlass(shortArrayKlassField.getValue())); 173 visitor.visit(new TypeArrayKlass(longArrayKlassField.getValue())); 174 visitor.visit(new TypeArrayKlass(singleArrayKlassField.getValue())); 175 visitor.visit(new TypeArrayKlass(doubleArrayKlassField.getValue())); 176 } 177 178 public void print() { printOn(System.out); } 179 public void printOn(PrintStream tty) { 180 heap().printOn(tty); 181 } 182 183 // Check whether an element of a typeArrayOop with the given type must be 184 // aligned 0 mod 8. The typeArrayOop itself must be aligned at least this 185 // strongly. 186 public static boolean elementTypeShouldBeAligned(BasicType type) { 187 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG; 188 } 189 190 // Check whether an object field (static/non-static) of the given type must be 191 // aligned 0 mod 8. 192 public static boolean fieldTypeShouldBeAligned(BasicType type) { 193 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG; 194 } 195 }