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 // single dimensional primitive array klasses
58 private static sun.jvm.hotspot.types.AddressField boolArrayKlassField;
59 private static sun.jvm.hotspot.types.AddressField byteArrayKlassField;
60 private static sun.jvm.hotspot.types.AddressField charArrayKlassField;
61 private static sun.jvm.hotspot.types.AddressField intArrayKlassField;
62 private static sun.jvm.hotspot.types.AddressField shortArrayKlassField;
63 private static sun.jvm.hotspot.types.AddressField longArrayKlassField;
64 private static sun.jvm.hotspot.types.AddressField singleArrayKlassField;
65 private static sun.jvm.hotspot.types.AddressField doubleArrayKlassField;
66
67 private static AddressField narrowOopBaseField;
68 private static CIntegerField narrowOopShiftField;
69 private static AddressField narrowKlassBaseField;
70 private static CIntegerField narrowKlassShiftField;
71
72 public enum NARROW_OOP_MODE {
73 UnscaledNarrowOop,
74 ZeroBasedNarrowOop,
75 HeapBasedNarrowOop
76 }
77
78 static {
79 VM.registerVMInitializedObserver(new Observer() {
80 public void update(Observable o, Object data) {
81 initialize(VM.getVM().getTypeDataBase());
82 }
83 });
84 }
85
86 private static boolean typeExists(TypeDataBase db, String type) {
87 try {
88 db.lookupType(type);
89 } catch (RuntimeException e) {
90 return false;
91 }
92 return true;
93 }
94
95 private static void addHeapTypeIfInDB(TypeDataBase db, Class heapClass) {
96 String heapName = heapClass.getSimpleName();
97 if (typeExists(db, heapName)) {
98 heapConstructor.addMapping(heapName, heapClass);
99 }
100 }
101
102 private static synchronized void initialize(TypeDataBase db) {
103 Type type = db.lookupType("Universe");
104
105 collectedHeapField = type.getAddressField("_collectedHeap");
106
107 heapConstructor = new VirtualConstructor(db);
108 addHeapTypeIfInDB(db, CMSHeap.class);
109 addHeapTypeIfInDB(db, SerialHeap.class);
110 addHeapTypeIfInDB(db, ParallelScavengeHeap.class);
111 addHeapTypeIfInDB(db, G1CollectedHeap.class);
112 addHeapTypeIfInDB(db, EpsilonHeap.class);
113 addHeapTypeIfInDB(db, ZCollectedHeap.class);
114 addHeapTypeIfInDB(db, ShenandoahHeap.class);
115
116 mainThreadGroupField = type.getOopField("_main_thread_group");
117 systemThreadGroupField = type.getOopField("_system_thread_group");
118
119 boolArrayKlassField = type.getAddressField("_boolArrayKlassObj");
120 byteArrayKlassField = type.getAddressField("_byteArrayKlassObj");
121 charArrayKlassField = type.getAddressField("_charArrayKlassObj");
122 intArrayKlassField = type.getAddressField("_intArrayKlassObj");
123 shortArrayKlassField = type.getAddressField("_shortArrayKlassObj");
124 longArrayKlassField = type.getAddressField("_longArrayKlassObj");
125 singleArrayKlassField = type.getAddressField("_singleArrayKlassObj");
126 doubleArrayKlassField = type.getAddressField("_doubleArrayKlassObj");
127
128 narrowOopBaseField = type.getAddressField("_narrow_oop._base");
129 narrowOopShiftField = type.getCIntegerField("_narrow_oop._shift");
130 narrowKlassBaseField = type.getAddressField("_narrow_klass._base");
131 narrowKlassShiftField = type.getCIntegerField("_narrow_klass._shift");
132
133 UniverseExt.initialize(heapConstructor);
134 }
135
136 public Universe() {
137 }
138 public static String narrowOopModeToString(NARROW_OOP_MODE mode) {
139 switch (mode) {
140 case UnscaledNarrowOop:
141 return "32-bits Oops";
142 case ZeroBasedNarrowOop:
143 return "zero based Compressed Oops";
144 case HeapBasedNarrowOop:
145 return "Compressed Oops with base";
146 }
147 return "";
148 }
149 public CollectedHeap heap() {
150 return (CollectedHeap) heapConstructor.instantiateWrapperFor(collectedHeapField.getValue());
151 }
152
153 public static long getNarrowOopBase() {
154 if (narrowOopBaseField.getValue() == null) {
155 return 0;
156 } else {
157 return narrowOopBaseField.getValue().minus(null);
158 }
159 }
160
161 public static int getNarrowOopShift() {
162 return (int)narrowOopShiftField.getValue();
163 }
164
165 public static long getNarrowKlassBase() {
166 if (narrowKlassBaseField.getValue() == null) {
167 return 0;
168 } else {
169 return narrowKlassBaseField.getValue().minus(null);
170 }
171 }
172
173 public static int getNarrowKlassShift() {
174 return (int)narrowKlassShiftField.getValue();
175 }
176
177
178 /** Returns "TRUE" iff "p" points into the allocated area of the heap. */
179 public boolean isIn(Address p) {
180 return heap().isIn(p);
181 }
182
183 /** Returns "TRUE" iff "p" points into the reserved area of the heap. */
184 public boolean isInReserved(Address p) {
185 return heap().isInReserved(p);
186 }
187
188 private Oop newOop(OopHandle handle) {
189 return VM.getVM().getObjectHeap().newOop(handle);
190 }
191
192 public Oop mainThreadGroup() {
193 return newOop(mainThreadGroupField.getValue());
194 }
195
196 public Oop systemThreadGroup() {
197 return newOop(systemThreadGroupField.getValue());
198 }
199
200
201 public void print() { printOn(System.out); }
202 public void printOn(PrintStream tty) {
203 heap().printOn(tty);
204 }
205
206 // Check whether an element of a typeArrayOop with the given type must be
207 // aligned 0 mod 8. The typeArrayOop itself must be aligned at least this
208 // strongly.
209 public static boolean elementTypeShouldBeAligned(BasicType type) {
210 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG;
211 }
212
213 // Check whether an object field (static/non-static) of the given type must be
214 // aligned 0 mod 8.
215 public static boolean fieldTypeShouldBeAligned(BasicType type) {
216 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG;
217 }
218 }