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.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 // single dimensional primitive array klasses
57 private static sun.jvm.hotspot.types.AddressField boolArrayKlassField;
58 private static sun.jvm.hotspot.types.AddressField byteArrayKlassField;
59 private static sun.jvm.hotspot.types.AddressField charArrayKlassField;
60 private static sun.jvm.hotspot.types.AddressField intArrayKlassField;
61 private static sun.jvm.hotspot.types.AddressField shortArrayKlassField;
62 private static sun.jvm.hotspot.types.AddressField longArrayKlassField;
63 private static sun.jvm.hotspot.types.AddressField singleArrayKlassField;
64 private static sun.jvm.hotspot.types.AddressField doubleArrayKlassField;
65
66 private static AddressField narrowOopBaseField;
67 private static CIntegerField narrowOopShiftField;
68 private static AddressField narrowKlassBaseField;
69 private static CIntegerField narrowKlassShiftField;
70
71 public enum NARROW_OOP_MODE {
72 UnscaledNarrowOop,
73 ZeroBasedNarrowOop,
74 HeapBasedNarrowOop
75 }
76
77 static {
78 VM.registerVMInitializedObserver(new Observer() {
79 public void update(Observable o, Object data) {
80 initialize(VM.getVM().getTypeDataBase());
81 }
82 });
83 }
84
85 private static boolean typeExists(TypeDataBase db, String type) {
86 try {
87 db.lookupType(type);
88 } catch (RuntimeException e) {
89 return false;
90 }
91 return true;
92 }
93
94 private static void addHeapTypeIfInDB(TypeDataBase db, Class heapClass) {
95 String heapName = heapClass.getSimpleName();
96 if (typeExists(db, heapName)) {
97 heapConstructor.addMapping(heapName, heapClass);
98 }
99 }
100
101 private static synchronized void initialize(TypeDataBase db) {
102 Type type = db.lookupType("Universe");
103
104 collectedHeapField = type.getAddressField("_collectedHeap");
105
106 heapConstructor = new VirtualConstructor(db);
107 addHeapTypeIfInDB(db, CMSHeap.class);
108 addHeapTypeIfInDB(db, SerialHeap.class);
109 addHeapTypeIfInDB(db, ParallelScavengeHeap.class);
110 addHeapTypeIfInDB(db, G1CollectedHeap.class);
111 addHeapTypeIfInDB(db, EpsilonHeap.class);
112 addHeapTypeIfInDB(db, ZCollectedHeap.class);
113
114 mainThreadGroupField = type.getOopField("_main_thread_group");
115 systemThreadGroupField = type.getOopField("_system_thread_group");
116
117 boolArrayKlassField = type.getAddressField("_boolArrayKlassObj");
118 byteArrayKlassField = type.getAddressField("_byteArrayKlassObj");
119 charArrayKlassField = type.getAddressField("_charArrayKlassObj");
120 intArrayKlassField = type.getAddressField("_intArrayKlassObj");
121 shortArrayKlassField = type.getAddressField("_shortArrayKlassObj");
122 longArrayKlassField = type.getAddressField("_longArrayKlassObj");
123 singleArrayKlassField = type.getAddressField("_singleArrayKlassObj");
124 doubleArrayKlassField = type.getAddressField("_doubleArrayKlassObj");
125
126 narrowOopBaseField = type.getAddressField("_narrow_oop._base");
127 narrowOopShiftField = type.getCIntegerField("_narrow_oop._shift");
128 narrowKlassBaseField = type.getAddressField("_narrow_klass._base");
129 narrowKlassShiftField = type.getCIntegerField("_narrow_klass._shift");
130
131 UniverseExt.initialize(heapConstructor);
132 }
133
134 public Universe() {
135 }
136 public static String narrowOopModeToString(NARROW_OOP_MODE mode) {
137 switch (mode) {
138 case UnscaledNarrowOop:
139 return "32-bits Oops";
140 case ZeroBasedNarrowOop:
141 return "zero based Compressed Oops";
142 case HeapBasedNarrowOop:
143 return "Compressed Oops with base";
144 }
145 return "";
146 }
147 public CollectedHeap heap() {
148 return (CollectedHeap) heapConstructor.instantiateWrapperFor(collectedHeapField.getValue());
149 }
150
151 public static long getNarrowOopBase() {
152 if (narrowOopBaseField.getValue() == null) {
153 return 0;
154 } else {
155 return narrowOopBaseField.getValue().minus(null);
156 }
157 }
158
159 public static int getNarrowOopShift() {
160 return (int)narrowOopShiftField.getValue();
161 }
162
163 public static long getNarrowKlassBase() {
164 if (narrowKlassBaseField.getValue() == null) {
165 return 0;
166 } else {
167 return narrowKlassBaseField.getValue().minus(null);
168 }
169 }
170
171 public static int getNarrowKlassShift() {
172 return (int)narrowKlassShiftField.getValue();
173 }
174
175
176 /** Returns "TRUE" iff "p" points into the allocated area of the heap. */
177 public boolean isIn(Address p) {
178 return heap().isIn(p);
179 }
180
181 /** Returns "TRUE" iff "p" points into the reserved area of the heap. */
182 public boolean isInReserved(Address p) {
183 return heap().isInReserved(p);
184 }
185
186 private Oop newOop(OopHandle handle) {
187 return VM.getVM().getObjectHeap().newOop(handle);
188 }
189
190 public Oop mainThreadGroup() {
191 return newOop(mainThreadGroupField.getValue());
192 }
193
194 public Oop systemThreadGroup() {
195 return newOop(systemThreadGroupField.getValue());
196 }
197
198
199 public void print() { printOn(System.out); }
200 public void printOn(PrintStream tty) {
201 heap().printOn(tty);
202 }
203
204 // Check whether an element of a typeArrayOop with the given type must be
205 // aligned 0 mod 8. The typeArrayOop itself must be aligned at least this
206 // strongly.
207 public static boolean elementTypeShouldBeAligned(BasicType type) {
208 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG;
209 }
210
211 // Check whether an object field (static/non-static) of the given type must be
212 // aligned 0 mod 8.
213 public static boolean fieldTypeShouldBeAligned(BasicType type) {
214 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG;
215 }
216 }