1 /*
2 * Copyright (c) 2000, 2012, 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_interface.*;
31 import sun.jvm.hotspot.gc_implementation.g1.G1CollectedHeap;
32 import sun.jvm.hotspot.gc_implementation.parallelScavenge.*;
33 import sun.jvm.hotspot.oops.*;
34 import sun.jvm.hotspot.types.*;
35 import sun.jvm.hotspot.runtime.*;
36
37
38 public class Universe {
39 private static AddressField collectedHeapField;
40 private static VirtualConstructor heapConstructor;
41 private static sun.jvm.hotspot.types.OopField mainThreadGroupField;
42 private static sun.jvm.hotspot.types.OopField systemThreadGroupField;
43
44 // single dimensional primitive array klasses
45 private static sun.jvm.hotspot.types.AddressField boolArrayKlassField;
46 private static sun.jvm.hotspot.types.AddressField byteArrayKlassField;
47 private static sun.jvm.hotspot.types.AddressField charArrayKlassField;
48 private static sun.jvm.hotspot.types.AddressField intArrayKlassField;
49 private static sun.jvm.hotspot.types.AddressField shortArrayKlassField;
50 private static sun.jvm.hotspot.types.AddressField longArrayKlassField;
51 private static sun.jvm.hotspot.types.AddressField singleArrayKlassField;
52 private static sun.jvm.hotspot.types.AddressField doubleArrayKlassField;
53
54 private static AddressField narrowOopBaseField;
55 private static CIntegerField narrowOopShiftField;
56 private static AddressField narrowKlassBaseField;
57 private static CIntegerField narrowKlassShiftField;
58
59 public enum NARROW_OOP_MODE {
60 UnscaledNarrowOop,
61 ZeroBasedNarrowOop,
62 HeapBasedNarrowOop
63 }
64
65 static {
66 VM.registerVMInitializedObserver(new Observer() {
67 public void update(Observable o, Object data) {
68 initialize(VM.getVM().getTypeDataBase());
69 }
70 });
71 }
72
73 private static synchronized void initialize(TypeDataBase db) {
74 Type type = db.lookupType("Universe");
75
76 collectedHeapField = type.getAddressField("_collectedHeap");
77
78 heapConstructor = new VirtualConstructor(db);
79 heapConstructor.addMapping("GenCollectedHeap", GenCollectedHeap.class);
80 heapConstructor.addMapping("ParallelScavengeHeap", ParallelScavengeHeap.class);
81 heapConstructor.addMapping("G1CollectedHeap", G1CollectedHeap.class);
82
83 mainThreadGroupField = type.getOopField("_main_thread_group");
84 systemThreadGroupField = type.getOopField("_system_thread_group");
85
86 boolArrayKlassField = type.getAddressField("_boolArrayKlassObj");
87 byteArrayKlassField = type.getAddressField("_byteArrayKlassObj");
88 charArrayKlassField = type.getAddressField("_charArrayKlassObj");
89 intArrayKlassField = type.getAddressField("_intArrayKlassObj");
90 shortArrayKlassField = type.getAddressField("_shortArrayKlassObj");
91 longArrayKlassField = type.getAddressField("_longArrayKlassObj");
92 singleArrayKlassField = type.getAddressField("_singleArrayKlassObj");
93 doubleArrayKlassField = type.getAddressField("_doubleArrayKlassObj");
94
95 narrowOopBaseField = type.getAddressField("_narrow_oop._base");
96 narrowOopShiftField = type.getCIntegerField("_narrow_oop._shift");
97 narrowKlassBaseField = type.getAddressField("_narrow_klass._base");
98 narrowKlassShiftField = type.getCIntegerField("_narrow_klass._shift");
99 }
100
101 public Universe() {
102 }
103 public static String narrowOopModeToString(NARROW_OOP_MODE mode) {
104 switch (mode) {
105 case UnscaledNarrowOop:
106 return "32-bits Oops";
107 case ZeroBasedNarrowOop:
108 return "zero based Compressed Oops";
109 case HeapBasedNarrowOop:
110 return "Compressed Oops with base";
111 }
112 return "";
113 }
114 public CollectedHeap heap() {
115 try {
116 return (CollectedHeap) heapConstructor.instantiateWrapperFor(collectedHeapField.getValue());
117 } catch (WrongTypeException e) {
118 return new CollectedHeap(collectedHeapField.getValue());
119 }
120 }
121
122 public static long getNarrowOopBase() {
123 if (narrowOopBaseField.getValue() == null) {
124 return 0;
125 } else {
126 return narrowOopBaseField.getValue().minus(null);
127 }
128 }
129
130 public static int getNarrowOopShift() {
131 return (int)narrowOopShiftField.getValue();
132 }
133
134 public static long getNarrowKlassBase() {
135 if (narrowKlassBaseField.getValue() == null) {
136 return 0;
137 } else {
138 return narrowKlassBaseField.getValue().minus(null);
139 }
140 }
141
142 public static int getNarrowKlassShift() {
143 return (int)narrowKlassShiftField.getValue();
144 }
145
146
147 /** Returns "TRUE" iff "p" points into the allocated area of the heap. */
148 public boolean isIn(Address p) {
149 return heap().isIn(p);
150 }
151
152 /** Returns "TRUE" iff "p" points into the reserved area of the heap. */
153 public boolean isInReserved(Address p) {
154 return heap().isInReserved(p);
155 }
156
157 private Oop newOop(OopHandle handle) {
158 return VM.getVM().getObjectHeap().newOop(handle);
159 }
160
161 public Oop mainThreadGroup() {
162 return newOop(mainThreadGroupField.getValue());
163 }
164
165 public Oop systemThreadGroup() {
166 return newOop(systemThreadGroupField.getValue());
167 }
168
169 // iterate through the single dimensional primitive array klasses
170 // refer to basic_type_classes_do(void f(Klass*)) in universe.cpp
171 public void basicTypeClassesDo(SystemDictionary.ClassVisitor visitor) {
172 visitor.visit(new TypeArrayKlass(boolArrayKlassField.getValue()));
173 visitor.visit(new TypeArrayKlass(byteArrayKlassField.getValue()));
174 visitor.visit(new TypeArrayKlass(charArrayKlassField.getValue()));
175 visitor.visit(new TypeArrayKlass(intArrayKlassField.getValue()));
176 visitor.visit(new TypeArrayKlass(shortArrayKlassField.getValue()));
177 visitor.visit(new TypeArrayKlass(longArrayKlassField.getValue()));
178 visitor.visit(new TypeArrayKlass(singleArrayKlassField.getValue()));
179 visitor.visit(new TypeArrayKlass(doubleArrayKlassField.getValue()));
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 }