1 #ifdef USE_PRAGMA_IDENT_HDR
2 #pragma ident "@(#)oop.pcgc.inline.hpp 1.16 07/05/29 09:44:24 JVM"
3 #endif
4 /*
5 * Copyright 2005-2008 Sun Microsystems, Inc. All Rights Reserved.
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7 *
8 * This code is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 only, as
10 * published by the Free Software Foundation.
11 *
12 * This code is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * version 2 for more details (a copy is included in the LICENSE file that
16 * accompanied this code).
17 *
18 * You should have received a copy of the GNU General Public License version
19 * 2 along with this work; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21 *
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
24 * have any questions.
25 *
26 */
27
28 inline void oopDesc::update_contents(ParCompactionManager* cm) {
29 // The klass field must be updated before anything else
30 // can be done.
31 DEBUG_ONLY(klassOopDesc* original_klass = klass());
32
33 // Can the option to update and/or copy be moved up in the
34 // call chain to avoid calling into here?
35
36 if (PSParallelCompact::should_update_klass(klass())) {
37 update_header();
38 assert(klass()->is_klass(), "Not updated correctly");
39 } else {
40 assert(klass()->is_klass(), "Not updated");
41 }
42
43 Klass* new_klass = blueprint();
44 if (!new_klass->oop_is_typeArray()) {
45 // It might contain oops beyond the header, so take the virtual call.
46 new_klass->oop_update_pointers(cm, this);
47 }
48 // Else skip it. The typeArrayKlass in the header never needs scavenging.
49 }
50
51 inline void oopDesc::update_contents(ParCompactionManager* cm,
52 HeapWord* begin_limit,
53 HeapWord* end_limit) {
54 // The klass field must be updated before anything else
55 // can be done.
56 debug_only(klassOopDesc* original_klass = klass());
57
58 update_contents(cm, klass(), begin_limit, end_limit);
59 }
60
61 inline void oopDesc::update_contents(ParCompactionManager* cm,
62 klassOop old_klass,
63 HeapWord* begin_limit,
64 HeapWord* end_limit) {
65
66 klassOop updated_klass =
67 PSParallelCompact::summary_data().calc_new_klass(old_klass);
68
69 // Needs to be boundary aware for the 64 bit case
70 // update_header();
71 // The klass has moved. Is the location of the klass
72 // within the limits?
73 if ((((HeapWord*)&_metadata._klass) >= begin_limit) &&
74 (((HeapWord*)&_metadata._klass) < end_limit)) {
75 set_klass(updated_klass);
76 }
77
78 Klass* klass = updated_klass->klass_part();
79 if (!klass->oop_is_typeArray()) {
80 // It might contain oops beyond the header, so take the virtual call.
81 klass->oop_update_pointers(cm, this, begin_limit, end_limit);
82 }
83 // Else skip it. The typeArrayKlass in the header never needs scavenging.
84 }
85
86 inline void oopDesc::follow_contents(ParCompactionManager* cm) {
87 assert (PSParallelCompact::mark_bitmap()->is_marked(this),
88 "should be marked");
89 blueprint()->oop_follow_contents(cm, this);
90 }
91
92 // Used by parallel old GC.
93
94 inline void oopDesc::follow_header(ParCompactionManager* cm) {
95 if (UseCompressedOops) {
96 PSParallelCompact::mark_and_push(cm, compressed_klass_addr());
97 } else {
98 PSParallelCompact::mark_and_push(cm, klass_addr());
99 }
100 }
101
102 inline oop oopDesc::forward_to_atomic(oop p) {
103 assert(ParNewGeneration::is_legal_forward_ptr(p),
104 "illegal forwarding pointer value.");
105 markOop oldMark = mark();
106 markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p);
107 markOop curMark;
108
109 assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable");
110 assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this.");
111
112 while (!is_forwarded()) {
113 curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark);
114 if (curMark == oldMark) {
115 assert(is_forwarded(), "the CAS should have succeeded.");
116 return NULL;
117 }
118 oldMark = curMark;
119 }
120 return forwardee();
121 }
122
123 inline void oopDesc::update_header() {
124 if (UseCompressedOops) {
125 PSParallelCompact::adjust_pointer(compressed_klass_addr());
126 } else {
127 PSParallelCompact::adjust_pointer(klass_addr());
128 }
129 }
130
131 inline void oopDesc::update_header(HeapWord* beg_addr, HeapWord* end_addr) {
132 if (UseCompressedOops) {
133 PSParallelCompact::adjust_pointer(compressed_klass_addr(),
134 beg_addr, end_addr);
135 } else {
136 PSParallelCompact::adjust_pointer(klass_addr(), beg_addr, end_addr);
137 }
138 }