Wed, 03 Sep 2014 09:25:44 +0200
Merge
1 /*
2 * Copyright (c) 2005, 2013, 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 */
25 #ifndef SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP
26 #define SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP
28 #include "utilities/macros.hpp"
29 #if INCLUDE_ALL_GCS
30 #include "gc_implementation/parNew/parNewGeneration.hpp"
31 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
32 #include "gc_implementation/parallelScavenge/psCompactionManager.hpp"
33 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp"
34 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
35 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
36 #endif // INCLUDE_ALL_GCS
38 inline void oopDesc::update_contents(ParCompactionManager* cm) {
39 // The klass field must be updated before anything else
40 // can be done.
41 DEBUG_ONLY(Klass* original_klass = klass());
43 Klass* new_klass = klass();
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 }
51 inline void oopDesc::follow_contents(ParCompactionManager* cm) {
52 assert (PSParallelCompact::mark_bitmap()->is_marked(this),
53 "should be marked");
54 klass()->oop_follow_contents(cm, this);
55 }
57 inline oop oopDesc::forward_to_atomic(oop p) {
58 assert(ParNewGeneration::is_legal_forward_ptr(p),
59 "illegal forwarding pointer value.");
60 markOop oldMark = mark();
61 markOop forwardPtrMark = markOopDesc::encode_pointer_as_mark(p);
62 markOop curMark;
64 assert(forwardPtrMark->decode_pointer() == p, "encoding must be reversable");
65 assert(sizeof(markOop) == sizeof(intptr_t), "CAS below requires this.");
67 while (!oldMark->is_marked()) {
68 curMark = (markOop)Atomic::cmpxchg_ptr(forwardPtrMark, &_mark, oldMark);
69 assert(is_forwarded(), "object should have been forwarded");
70 if (curMark == oldMark) {
71 return NULL;
72 }
73 // If the CAS was unsuccessful then curMark->is_marked()
74 // should return true as another thread has CAS'd in another
75 // forwarding pointer.
76 oldMark = curMark;
77 }
78 return forwardee();
79 }
81 #endif // SHARE_VM_OOPS_OOP_PCGC_INLINE_HPP