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.g1.G1CollectedHeap;
35 import sun.jvm.hotspot.gc.parallel.ParallelScavengeHeap;
36 import sun.jvm.hotspot.gc.serial.SerialHeap;
37 import sun.jvm.hotspot.gc.shared.CollectedHeap;
38 import sun.jvm.hotspot.gc.z.ZCollectedHeap;
39 import sun.jvm.hotspot.oops.Oop;
40 import sun.jvm.hotspot.runtime.BasicType;
41 import sun.jvm.hotspot.runtime.VM;
42 import sun.jvm.hotspot.runtime.VirtualConstructor;
43 import sun.jvm.hotspot.types.AddressField;
44 import sun.jvm.hotspot.types.CIntegerField;
45 import sun.jvm.hotspot.types.Type;
46 import sun.jvm.hotspot.types.TypeDataBase;
47
48
49 public class Universe {
50 private static AddressField collectedHeapField;
51 private static VirtualConstructor heapConstructor;
52 private static sun.jvm.hotspot.types.OopField mainThreadGroupField;
53 private static sun.jvm.hotspot.types.OopField systemThreadGroupField;
54
55 // single dimensional primitive array klasses
56 private static sun.jvm.hotspot.types.AddressField boolArrayKlassField;
57 private static sun.jvm.hotspot.types.AddressField byteArrayKlassField;
58 private static sun.jvm.hotspot.types.AddressField charArrayKlassField;
59 private static sun.jvm.hotspot.types.AddressField intArrayKlassField;
60 private static sun.jvm.hotspot.types.AddressField shortArrayKlassField;
61 private static sun.jvm.hotspot.types.AddressField longArrayKlassField;
62 private static sun.jvm.hotspot.types.AddressField singleArrayKlassField;
63 private static sun.jvm.hotspot.types.AddressField doubleArrayKlassField;
64
65 private static AddressField narrowOopBaseField;
66 private static CIntegerField narrowOopShiftField;
67 private static AddressField narrowKlassBaseField;
68 private static CIntegerField narrowKlassShiftField;
69
70 public enum NARROW_OOP_MODE {
71 UnscaledNarrowOop,
72 ZeroBasedNarrowOop,
73 HeapBasedNarrowOop
74 }
75
76 static {
77 VM.registerVMInitializedObserver(new Observer() {
78 public void update(Observable o, Object data) {
79 initialize(VM.getVM().getTypeDataBase());
80 }
81 });
82 }
83
84 private static boolean typeExists(TypeDataBase db, String type) {
85 try {
86 db.lookupType(type);
87 } catch (RuntimeException e) {
88 return false;
89 }
90 return true;
91 }
92
93 private static void addHeapTypeIfInDB(TypeDataBase db, Class heapClass) {
94 String heapName = heapClass.getSimpleName();
95 if (typeExists(db, heapName)) {
96 heapConstructor.addMapping(heapName, heapClass);
97 }
98 }
99
100 private static synchronized void initialize(TypeDataBase db) {
101 Type type = db.lookupType("Universe");
102
103 collectedHeapField = type.getAddressField("_collectedHeap");
104
105 heapConstructor = new VirtualConstructor(db);
106 addHeapTypeIfInDB(db, CMSHeap.class);
107 addHeapTypeIfInDB(db, SerialHeap.class);
108 addHeapTypeIfInDB(db, ParallelScavengeHeap.class);
109 addHeapTypeIfInDB(db, G1CollectedHeap.class);
110 addHeapTypeIfInDB(db, ZCollectedHeap.class);
111
112 mainThreadGroupField = type.getOopField("_main_thread_group");
113 systemThreadGroupField = type.getOopField("_system_thread_group");
114
115 boolArrayKlassField = type.getAddressField("_boolArrayKlassObj");
116 byteArrayKlassField = type.getAddressField("_byteArrayKlassObj");
117 charArrayKlassField = type.getAddressField("_charArrayKlassObj");
118 intArrayKlassField = type.getAddressField("_intArrayKlassObj");
119 shortArrayKlassField = type.getAddressField("_shortArrayKlassObj");
120 longArrayKlassField = type.getAddressField("_longArrayKlassObj");
121 singleArrayKlassField = type.getAddressField("_singleArrayKlassObj");
122 doubleArrayKlassField = type.getAddressField("_doubleArrayKlassObj");
123
124 narrowOopBaseField = type.getAddressField("_narrow_oop._base");
125 narrowOopShiftField = type.getCIntegerField("_narrow_oop._shift");
126 narrowKlassBaseField = type.getAddressField("_narrow_klass._base");
127 narrowKlassShiftField = type.getCIntegerField("_narrow_klass._shift");
128
129 UniverseExt.initialize(heapConstructor);
130 }
131
132 public Universe() {
133 }
134 public static String narrowOopModeToString(NARROW_OOP_MODE mode) {
135 switch (mode) {
136 case UnscaledNarrowOop:
137 return "32-bits Oops";
138 case ZeroBasedNarrowOop:
139 return "zero based Compressed Oops";
140 case HeapBasedNarrowOop:
141 return "Compressed Oops with base";
142 }
143 return "";
144 }
145 public CollectedHeap heap() {
146 return (CollectedHeap) heapConstructor.instantiateWrapperFor(collectedHeapField.getValue());
147 }
148
149 public static long getNarrowOopBase() {
150 if (narrowOopBaseField.getValue() == null) {
151 return 0;
152 } else {
153 return narrowOopBaseField.getValue().minus(null);
154 }
155 }
156
157 public static int getNarrowOopShift() {
158 return (int)narrowOopShiftField.getValue();
159 }
160
161 public static long getNarrowKlassBase() {
162 if (narrowKlassBaseField.getValue() == null) {
163 return 0;
164 } else {
165 return narrowKlassBaseField.getValue().minus(null);
166 }
167 }
168
169 public static int getNarrowKlassShift() {
170 return (int)narrowKlassShiftField.getValue();
171 }
172
173
174 /** Returns "TRUE" iff "p" points into the allocated area of the heap. */
175 public boolean isIn(Address p) {
176 return heap().isIn(p);
177 }
178
179 /** Returns "TRUE" iff "p" points into the reserved area of the heap. */
180 public boolean isInReserved(Address p) {
181 return heap().isInReserved(p);
182 }
183
184 private Oop newOop(OopHandle handle) {
185 return VM.getVM().getObjectHeap().newOop(handle);
186 }
187
188 public Oop mainThreadGroup() {
189 return newOop(mainThreadGroupField.getValue());
190 }
191
192 public Oop systemThreadGroup() {
193 return newOop(systemThreadGroupField.getValue());
194 }
195
196
197 public void print() { printOn(System.out); }
198 public void printOn(PrintStream tty) {
199 heap().printOn(tty);
200 }
201
202 // Check whether an element of a typeArrayOop with the given type must be
203 // aligned 0 mod 8. The typeArrayOop itself must be aligned at least this
204 // strongly.
205 public static boolean elementTypeShouldBeAligned(BasicType type) {
206 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG;
207 }
208
209 // Check whether an object field (static/non-static) of the given type must be
210 // aligned 0 mod 8.
211 public static boolean fieldTypeShouldBeAligned(BasicType type) {
212 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG;
213 }
214 }