1 /*
2 * Copyright (c) 2000, 2018, 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.shenandoah.ShenandoahHeap;
40 import sun.jvm.hotspot.gc.z.ZCollectedHeap;
41 import sun.jvm.hotspot.oops.Oop;
42 import sun.jvm.hotspot.runtime.BasicType;
43 import sun.jvm.hotspot.runtime.VM;
44 import sun.jvm.hotspot.runtime.VirtualConstructor;
45 import sun.jvm.hotspot.types.AddressField;
46 import sun.jvm.hotspot.types.CIntegerField;
47 import sun.jvm.hotspot.types.Type;
48 import sun.jvm.hotspot.types.TypeDataBase;
49
50
51 public class Universe {
52 private static AddressField collectedHeapField;
53 private static VirtualConstructor heapConstructor;
54 private static sun.jvm.hotspot.types.OopField mainThreadGroupField;
55 private static sun.jvm.hotspot.types.OopField systemThreadGroupField;
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 boolean typeExists(TypeDataBase db, String type) {
77 try {
78 db.lookupType(type);
79 } catch (RuntimeException e) {
80 return false;
81 }
82 return true;
83 }
84
85 private static void addHeapTypeIfInDB(TypeDataBase db, Class heapClass) {
86 String heapName = heapClass.getSimpleName();
87 if (typeExists(db, heapName)) {
88 heapConstructor.addMapping(heapName, heapClass);
89 }
90 }
91
92 private static synchronized void initialize(TypeDataBase db) {
93 Type type = db.lookupType("Universe");
94
95 collectedHeapField = type.getAddressField("_collectedHeap");
96
97 heapConstructor = new VirtualConstructor(db);
98 addHeapTypeIfInDB(db, CMSHeap.class);
99 addHeapTypeIfInDB(db, SerialHeap.class);
100 addHeapTypeIfInDB(db, ParallelScavengeHeap.class);
101 addHeapTypeIfInDB(db, G1CollectedHeap.class);
102 addHeapTypeIfInDB(db, EpsilonHeap.class);
103 addHeapTypeIfInDB(db, ZCollectedHeap.class);
104 addHeapTypeIfInDB(db, ShenandoahHeap.class);
105
106 mainThreadGroupField = type.getOopField("_main_thread_group");
107 systemThreadGroupField = type.getOopField("_system_thread_group");
108
109 narrowOopBaseField = type.getAddressField("_narrow_oop._base");
110 narrowOopShiftField = type.getCIntegerField("_narrow_oop._shift");
111 narrowKlassBaseField = type.getAddressField("_narrow_klass._base");
112 narrowKlassShiftField = type.getCIntegerField("_narrow_klass._shift");
113
114 UniverseExt.initialize(heapConstructor);
115 }
116
117 public Universe() {
118 }
119 public static String narrowOopModeToString(NARROW_OOP_MODE mode) {
120 switch (mode) {
121 case UnscaledNarrowOop:
122 return "32-bits Oops";
123 case ZeroBasedNarrowOop:
124 return "zero based Compressed Oops";
125 case HeapBasedNarrowOop:
126 return "Compressed Oops with base";
127 }
128 return "";
129 }
130 public CollectedHeap heap() {
131 return (CollectedHeap) heapConstructor.instantiateWrapperFor(collectedHeapField.getValue());
132 }
133
134 public static long getNarrowOopBase() {
135 if (narrowOopBaseField.getValue() == null) {
136 return 0;
137 } else {
138 return narrowOopBaseField.getValue().minus(null);
139 }
140 }
141
142 public static int getNarrowOopShift() {
143 return (int)narrowOopShiftField.getValue();
144 }
145
146 public static long getNarrowKlassBase() {
147 if (narrowKlassBaseField.getValue() == null) {
148 return 0;
149 } else {
150 return narrowKlassBaseField.getValue().minus(null);
151 }
152 }
153
154 public static int getNarrowKlassShift() {
155 return (int)narrowKlassShiftField.getValue();
156 }
157
158
159 /** Returns "TRUE" iff "p" points into the allocated area of the heap. */
160 public boolean isIn(Address p) {
161 return heap().isIn(p);
162 }
163
164 /** Returns "TRUE" iff "p" points into the reserved area of the heap. */
165 public boolean isInReserved(Address p) {
166 return heap().isInReserved(p);
167 }
168
169 private Oop newOop(OopHandle handle) {
170 return VM.getVM().getObjectHeap().newOop(handle);
171 }
172
173 public Oop mainThreadGroup() {
174 return newOop(mainThreadGroupField.getValue());
175 }
176
177 public Oop systemThreadGroup() {
178 return newOop(systemThreadGroupField.getValue());
179 }
180
181
182 public void print() { printOn(System.out); }
183 public void printOn(PrintStream tty) {
184 heap().printOn(tty);
185 }
186
187 // Check whether an element of a typeArrayOop with the given type must be
188 // aligned 0 mod 8. The typeArrayOop itself must be aligned at least this
189 // strongly.
190 public static boolean elementTypeShouldBeAligned(BasicType type) {
191 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG;
192 }
193
194 // Check whether an object field (static/non-static) of the given type must be
195 // aligned 0 mod 8.
196 public static boolean fieldTypeShouldBeAligned(BasicType type) {
197 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG;
198 }
199 }