1 /*
2 * Copyright (c) 2005, 2010, 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 #ifndef SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP
26 #define SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP
27
28 #ifndef SERIALGC
29 #include "gc_implementation/parNew/parNewGeneration.hpp"
30 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
31 #include "gc_implementation/parallelScavenge/psCompactionManager.hpp"
32 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp"
33 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
34 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
35 #endif
36
37 inline void oopDesc::update_contents(ParCompactionManager* cm) {
38 // The klass field must be updated before anything else
39 // can be done.
40 DEBUG_ONLY(klassOopDesc* original_klass = klass());
41
42 // Can the option to update and/or copy be moved up in the
43 // call chain to avoid calling into here?
44
45 if (PSParallelCompact::should_update_klass(klass())) {
46 update_header();
47 assert(klass()->is_klass(), "Not updated correctly");
48 } else {
49 assert(klass()->is_klass(), "Not updated");
50 }
51
52 Klass* new_klass = blueprint();
53 if (!new_klass->oop_is_typeArray()) {
54 // It might contain oops beyond the header, so take the virtual call.
55 new_klass->oop_update_pointers(cm, this);
56 }
57 // Else skip it. The typeArrayKlass in the header never needs scavenging.
58 }
59
60 inline void oopDesc::update_contents(ParCompactionManager* cm,
61 HeapWord* begin_limit,
62 HeapWord* end_limit) {
63 // The klass field must be updated before anything else
64 // can be done.
65 debug_only(klassOopDesc* original_klass = klass());
66
67 update_contents(cm, klass(), begin_limit, end_limit);
68 }
69
70 inline void oopDesc::update_contents(ParCompactionManager* cm,
71 klassOop old_klass,
72 HeapWord* begin_limit,
73 HeapWord* end_limit) {
74
75 klassOop updated_klass =
76 PSParallelCompact::summary_data().calc_new_klass(old_klass);
77
78 // Needs to be boundary aware for the 64 bit case
79 // update_header();
80 // The klass has moved. Is the location of the klass
81 // within the limits?
82 if ((((HeapWord*)&_metadata._klass) >= begin_limit) &&
83 (((HeapWord*)&_metadata._klass) < end_limit)) {
84 set_klass(updated_klass);
85 }
86
87 Klass* klass = updated_klass->klass_part();
88 if (!klass->oop_is_typeArray()) {
89 // It might contain oops beyond the header, so take the virtual call.
90 klass->oop_update_pointers(cm, this, begin_limit, end_limit);
91 }
92 // Else skip it. The typeArrayKlass in the header never needs scavenging.
93 }
94
95 inline void oopDesc::follow_contents(ParCompactionManager* cm) {
96 assert (PSParallelCompact::mark_bitmap()->is_marked(this),
97 "should be marked");
98 blueprint()->oop_follow_contents(cm, this);
99 }
100
101 // Used by parallel old GC.
102
103 inline void oopDesc::follow_header(ParCompactionManager* cm) {
104 if (UseCompressedOops) {
105 PSParallelCompact::mark_and_push(cm, compressed_klass_addr());
106 } else {
107 PSParallelCompact::mark_and_push(cm, klass_addr());
108 }
109 }
110
111 inline oop oopDesc::forward_to_atomic(oop p) {
112 assert(ParNewGeneration::is_legal_forward_ptr(p),
113 "illegal forwarding pointer value.");
114 markOop oldMark = mark();
115 markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p);
116 markOop curMark;
117
118 assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable");
119 assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this.");
120
121 while (!is_forwarded()) {
122 curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark);
123 if (curMark == oldMark) {
124 assert(is_forwarded(), "the CAS should have succeeded.");
125 return NULL;
126 }
127 oldMark = curMark;
128 }
129 return forwardee();
130 }
131
132 inline void oopDesc::update_header() {
133 if (UseCompressedOops) {
134 PSParallelCompact::adjust_pointer(compressed_klass_addr());
135 } else {
136 PSParallelCompact::adjust_pointer(klass_addr());
137 }
138 }
139
140 inline void oopDesc::update_header(HeapWord* beg_addr, HeapWord* end_addr) {
141 if (UseCompressedOops) {
142 PSParallelCompact::adjust_pointer(compressed_klass_addr(),
143 beg_addr, end_addr);
144 } else {
145 PSParallelCompact::adjust_pointer(klass_addr(), beg_addr, end_addr);
146 }
147 }
148
149 #endif // SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP