1/*
2 * Copyright (c) 2015, 2018, Red Hat, Inc. All rights reserved.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This code is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
11 * version 2 for more details (a copy is included in the LICENSE file that
12 * accompanied this code).
13 *
14 * You should have received a copy of the GNU General Public License version
15 * 2 along with this work; if not, write to the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
19 * or visit www.oracle.com if you need additional information or have any
20 * questions.
21 *
22 */
23
24#ifndef SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_INLINE_HPP
25#define SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_INLINE_HPP
26
27#include "gc/shenandoah/shenandoahAsserts.hpp"
28#include "gc/shenandoah/shenandoahForwarding.hpp"
29#include "oops/markOop.inline.hpp"
30#include "runtime/atomic.hpp"
31
32inline HeapWord* ShenandoahForwarding::get_forwardee_raw(oop obj) {
33 shenandoah_assert_in_heap(NULL, obj);
34 return get_forwardee_raw_unchecked(obj);
35}
36
37inline HeapWord* ShenandoahForwarding::get_forwardee_raw_unchecked(oop obj) {
38 markOop mark = obj->mark_raw();
39 if (mark->is_marked()) {
40 return (HeapWord*) mark->clear_lock_bits();
41 } else {
42 return (HeapWord*) obj;
43 }
44}
45
46inline oop ShenandoahForwarding::get_forwardee(oop obj) {
47 shenandoah_assert_correct(NULL, obj);
48 return oop(get_forwardee_raw_unchecked(obj));
49}
50
51inline bool ShenandoahForwarding::is_forwarded(oop obj) {
52 return obj->mark_raw()->is_marked();
53}
54
55inline oop ShenandoahForwarding::try_update_forwardee(oop obj, oop update) {
56 markOop old_mark = obj->mark_raw();
57 if (old_mark->is_marked()) {
58 return (oop) old_mark->clear_lock_bits();
59 }
60
61 markOop new_mark = markOopDesc::encode_pointer_as_mark(update);
62 markOop prev_mark = obj->cas_set_mark_raw(new_mark, old_mark);
63 if (prev_mark == old_mark) {
64 return update;
65 } else {
66 return (oop) prev_mark->clear_lock_bits();
67 }
68}
69
70#endif // SHARE_GC_SHENANDOAH_SHENANDOAHFORWARDING_INLINE_HPP
71