1 /*
2 * Copyright (c) 2000, 2024, 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 sun.jvm.hotspot.utilities.Observable;
29 import sun.jvm.hotspot.utilities.Observer;
30
31 import sun.jvm.hotspot.debugger.Address;
32 import sun.jvm.hotspot.debugger.OopHandle;
33 import sun.jvm.hotspot.gc.epsilon.EpsilonHeap;
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.shenandoah.ShenandoahHeap;
39 import sun.jvm.hotspot.gc.z.ZCollectedHeap;
40 import sun.jvm.hotspot.oops.Oop;
41 import sun.jvm.hotspot.runtime.BasicType;
42 import sun.jvm.hotspot.runtime.VM;
43 import sun.jvm.hotspot.runtime.VMObject;
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
55 static {
56 VM.registerVMInitializedObserver(new Observer() {
57 public void update(Observable o, Object data) {
58 initialize(VM.getVM().getTypeDataBase());
59 }
60 });
61 }
62
63 private static boolean typeExists(TypeDataBase db, String type) {
64 try {
65 db.lookupType(type);
66 } catch (RuntimeException e) {
67 return false;
68 }
69 return true;
70 }
71
72 private static void addHeapTypeIfInDB(TypeDataBase db, Class<? extends VMObject> heapClass) {
73 String heapName = heapClass.getSimpleName();
74 if (typeExists(db, heapName)) {
75 heapConstructor.addMapping(heapName, heapClass);
76 }
77 }
78
79 private static synchronized void initialize(TypeDataBase db) {
80 Type type = db.lookupType("Universe");
81
82 collectedHeapField = type.getAddressField("_collectedHeap");
83
84 heapConstructor = new VirtualConstructor(db);
85 addHeapTypeIfInDB(db, SerialHeap.class);
86 addHeapTypeIfInDB(db, ParallelScavengeHeap.class);
87 addHeapTypeIfInDB(db, G1CollectedHeap.class);
88 addHeapTypeIfInDB(db, EpsilonHeap.class);
89 addHeapTypeIfInDB(db, ZCollectedHeap.class);
90 addHeapTypeIfInDB(db, ShenandoahHeap.class);
91
92 UniverseExt.initialize(heapConstructor);
93 }
94
95 public Universe() {
96 }
97 public CollectedHeap heap() {
98 return (CollectedHeap) heapConstructor.instantiateWrapperFor(collectedHeapField.getValue());
99 }
100
101
102 /** Returns "TRUE" iff "p" points into the allocated area of the heap. */
103 public boolean isIn(Address p) {
104 return heap().isIn(p);
105 }
106
107 /** Returns "TRUE" iff "p" points into the reserved area of the heap. */
108 public boolean isInReserved(Address p) {
109 return heap().isInReserved(p);
110 }
111
112 public void print() { printOn(System.out); }
113 public void printOn(PrintStream tty) {
114 heap().printOn(tty);
115 }
116
117 // Check whether an object field (static/non-static) of the given type must be
118 // aligned 0 mod 8.
119 public static boolean fieldTypeShouldBeAligned(BasicType type) {
120 return type == BasicType.T_DOUBLE || type == BasicType.T_LONG;
121 }
122 }