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comparison agent/src/share/classes/sun/jvm/hotspot/oops/Array.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children ba764ed4b6f2
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2000-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.oops;
26
27 import java.util.*;
28 import sun.jvm.hotspot.debugger.*;
29 import sun.jvm.hotspot.memory.*;
30 import sun.jvm.hotspot.runtime.*;
31 import sun.jvm.hotspot.types.*;
32
33 // Array is an abstract superclass for TypeArray and ObjArray
34
35 public class Array extends Oop {
36 static {
37 VM.registerVMInitializedObserver(new Observer() {
38 public void update(Observable o, Object data) {
39 initialize(VM.getVM().getTypeDataBase());
40 }
41 });
42 }
43
44 Array(OopHandle handle, ObjectHeap heap) {
45 super(handle, heap);
46 }
47
48 private static void initialize(TypeDataBase db) throws WrongTypeException {
49 Type type = db.lookupType("arrayOopDesc");
50 length = new CIntField(type.getCIntegerField("_length"), 0);
51 headerSize = type.getSize();
52 }
53
54 // Size of the arrayOopDesc
55 private static long headerSize;
56
57 // Fields
58 private static CIntField length;
59
60 // Accessors for declared fields
61 public long getLength() { return length.getValue(this); }
62
63 public long getObjectSize() {
64 ArrayKlass klass = (ArrayKlass) getKlass();
65 // We have to fetch the length of the array, shift (multiply) it
66 // appropriately, up to wordSize, add the header, and align to
67 // object size.
68 long s = getLength() << klass.getLog2ElementSize();
69 s += klass.getArrayHeaderInBytes();
70 s = Oop.alignObjectSize(s);
71 return s;
72 }
73
74 public static long baseOffsetInBytes(BasicType type) {
75 if (Universe.elementTypeShouldBeAligned(type)) {
76 return (VM.getVM().isLP64()) ? alignObjectSize(headerSize)
77 : VM.getVM().alignUp(headerSize, 8);
78 } else {
79 return headerSize;
80 }
81 }
82
83 public boolean isArray() { return true; }
84
85 public void iterateFields(OopVisitor visitor, boolean doVMFields) {
86 super.iterateFields(visitor, doVMFields);
87 if (doVMFields) {
88 visitor.doCInt(length, true);
89 }
90 }
91 }