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comparison src/share/vm/oops/oop.pcgc.inline.hpp @ 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 2005-2007 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 inline void oopDesc::update_contents(ParCompactionManager* cm) {
26 // The klass field must be updated before anything else
27 // can be done.
28 DEBUG_ONLY(klassOopDesc* original_klass = klass());
29
30 // Can the option to update and/or copy be moved up in the
31 // call chain to avoid calling into here?
32
33 if (PSParallelCompact::should_update_klass(klass())) {
34 update_header();
35 assert(klass()->is_klass(), "Not updated correctly");
36 } else {
37 assert(klass()->is_klass(), "Not updated");
38 }
39
40 Klass* new_klass = blueprint();
41 if (!new_klass->oop_is_typeArray()) {
42 // It might contain oops beyond the header, so take the virtual call.
43 new_klass->oop_update_pointers(cm, this);
44 }
45 // Else skip it. The typeArrayKlass in the header never needs scavenging.
46 }
47
48 inline void oopDesc::update_contents(ParCompactionManager* cm,
49 HeapWord* begin_limit,
50 HeapWord* end_limit) {
51 // The klass field must be updated before anything else
52 // can be done.
53 debug_only(klassOopDesc* original_klass = klass());
54
55 update_contents(cm, klass(), begin_limit, end_limit);
56 }
57
58 inline void oopDesc::update_contents(ParCompactionManager* cm,
59 klassOop old_klass,
60 HeapWord* begin_limit,
61 HeapWord* end_limit) {
62
63 klassOop updated_klass =
64 PSParallelCompact::summary_data().calc_new_klass(old_klass);
65
66 // Needs to be boundary aware for the 64 bit case
67 // update_header();
68 // The klass has moved. Is the location of the klass
69 // within the limits?
70 if ((((HeapWord*)&_klass) >= begin_limit) &&
71 (((HeapWord*)&_klass) < end_limit)) {
72 set_klass(updated_klass);
73 }
74
75 Klass* klass = updated_klass->klass_part();
76 if (!klass->oop_is_typeArray()) {
77 // It might contain oops beyond the header, so take the virtual call.
78 klass->oop_update_pointers(cm, this, begin_limit, end_limit);
79 }
80 // Else skip it. The typeArrayKlass in the header never needs scavenging.
81 }
82
83 inline void oopDesc::follow_contents(ParCompactionManager* cm) {
84 assert (PSParallelCompact::mark_bitmap()->is_marked(this),
85 "should be marked");
86 blueprint()->oop_follow_contents(cm, this);
87 }
88
89 // Used by parallel old GC.
90
91 inline void oopDesc::follow_header(ParCompactionManager* cm) {
92 PSParallelCompact::mark_and_push(cm, (oop*)&_klass);
93 }
94
95 inline oop oopDesc::forward_to_atomic(oop p) {
96 assert(ParNewGeneration::is_legal_forward_ptr(p),
97 "illegal forwarding pointer value.");
98 markOop oldMark = mark();
99 markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p);
100 markOop curMark;
101
102 assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable");
103 assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this.");
104
105 while (!is_forwarded()) {
106 curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark);
107 if (curMark == oldMark) {
108 assert(is_forwarded(), "the CAS should have succeeded.");
109 return NULL;
110 }
111 oldMark = curMark;
112 }
113 return forwardee();
114 }
115
116 inline void oopDesc::update_header() {
117 PSParallelCompact::adjust_pointer((oop*)&_klass);
118 }
119
120 inline void oopDesc::update_header(HeapWord* beg_addr, HeapWord* end_addr) {
121 PSParallelCompact::adjust_pointer((oop*)&_klass, beg_addr, end_addr);
122 }