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comparison agent/src/share/classes/sun/jvm/hotspot/types/basic/BasicNarrowOopField.java @ 113:ba764ed4b6f2

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6420645: Create a vm that uses compressed oops for up to 32gb heapsizes Summary: Compressed oops in instances, arrays, and headers. Code contributors are coleenp, phh, never, swamyv Reviewed-by: jmasa, kamg, acorn, tbell, kvn, rasbold
author coleenp
date Sun, 13 Apr 2008 17:43:42 -0400
parents
children c18cbe5936b8
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110:a49a647afe9a 113:ba764ed4b6f2
1 /*
2 * Copyright 2008 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.types.basic;
26
27 import sun.jvm.hotspot.debugger.*;
28 import sun.jvm.hotspot.types.*;
29
30 /** A specialization of BasicField which represents a field containing
31 an oop value and which adds typechecked getValue() routines
32 returning OopHandles. */
33
34 public class BasicNarrowOopField extends BasicOopField implements NarrowOopField {
35
36 private static final boolean DEBUG = false;
37
38 public BasicNarrowOopField (OopField oopf) {
39 super(oopf);
40 }
41
42 public BasicNarrowOopField(BasicTypeDataBase db, Type containingType, String name, Type type,
43 boolean isStatic, long offset, Address staticFieldAddress) {
44 super(db, containingType, name, type, isStatic, offset, staticFieldAddress);
45
46 if (DEBUG) {
47 System.out.println(" name " + name + " type " + type + " isStatic " + isStatic + " offset " + offset + " static addr " + staticFieldAddress);
48 }
49 if (!type.isOopType()) {
50 throw new WrongTypeException("Type of a BasicOopField must be an oop type");
51 }
52 }
53
54 /** The field must be nonstatic and the type of the field must be a
55 Java oop, or a WrongTypeException will be thrown. */
56 public OopHandle getValue(Address addr) throws UnmappedAddressException, UnalignedAddressException, WrongTypeException {
57 return getNarrowOopHandle(addr);
58 }
59
60 /** The field must be static and the type of the field must be a
61 Java oop, or a WrongTypeException will be thrown. */
62 public OopHandle getValue() throws UnmappedAddressException, UnalignedAddressException, WrongTypeException {
63 return getNarrowOopHandle();
64 }
65 }