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