1/*
2 * Copyright (c) 2015, 2019, 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.
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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
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22 */
23
24#ifndef SHARE_GC_Z_ZOOPCLOSURES_INLINE_HPP
25#define SHARE_GC_Z_ZOOPCLOSURES_INLINE_HPP
26
27#include "classfile/classLoaderData.hpp"
28#include "gc/z/zBarrier.inline.hpp"
29#include "gc/z/zHeap.inline.hpp"
30#include "gc/z/zOop.inline.hpp"
31#include "gc/z/zOopClosures.hpp"
32#include "oops/oop.inline.hpp"
33#include "runtime/atomic.hpp"
34#include "utilities/debug.hpp"
35
36inline void ZLoadBarrierOopClosure::do_oop(oop* p) {
37 ZBarrier::load_barrier_on_oop_field(p);
38}
39
40inline void ZLoadBarrierOopClosure::do_oop(narrowOop* p) {
41 ShouldNotReachHere();
42}
43
44inline void ZNMethodOopClosure::do_oop(oop* p) {
45 if (ZResurrection::is_blocked()) {
46 ZBarrier::keep_alive_barrier_on_phantom_root_oop_field(p);
47 } else {
48 ZBarrier::load_barrier_on_root_oop_field(p);
49 }
50}
51
52inline void ZNMethodOopClosure::do_oop(narrowOop* p) {
53 ShouldNotReachHere();
54}
55
56template <bool finalizable>
57inline ZMarkBarrierOopClosure<finalizable>::ZMarkBarrierOopClosure() :
58 ClaimMetadataVisitingOopIterateClosure(finalizable
59 ? ClassLoaderData::_claim_finalizable
60 : ClassLoaderData::_claim_strong,
61 finalizable
62 ? NULL
63 : ZHeap::heap()->reference_discoverer()) {}
64
65template <bool finalizable>
66inline void ZMarkBarrierOopClosure<finalizable>::do_oop(oop* p) {
67 ZBarrier::mark_barrier_on_oop_field(p, finalizable);
68}
69
70template <bool finalizable>
71inline void ZMarkBarrierOopClosure<finalizable>::do_oop(narrowOop* p) {
72 ShouldNotReachHere();
73}
74
75inline bool ZPhantomIsAliveObjectClosure::do_object_b(oop o) {
76 return ZBarrier::is_alive_barrier_on_phantom_oop(o);
77}
78
79inline void ZPhantomKeepAliveOopClosure::do_oop(oop* p) {
80 ZBarrier::keep_alive_barrier_on_phantom_oop_field(p);
81}
82
83inline void ZPhantomKeepAliveOopClosure::do_oop(narrowOop* p) {
84 ShouldNotReachHere();
85}
86
87inline void ZPhantomCleanOopClosure::do_oop(oop* p) {
88 // Read the oop once, to make sure the liveness check
89 // and the later clearing uses the same value.
90 const oop obj = *(volatile oop*)p;
91 if (ZBarrier::is_alive_barrier_on_phantom_oop(obj)) {
92 ZBarrier::keep_alive_barrier_on_phantom_oop_field(p);
93 } else {
94 // The destination could have been modified/reused, in which case
95 // we don't want to clear it. However, no one could write the same
96 // oop here again (the object would be strongly live and we would
97 // not consider clearing such oops), so therefore we don't have an
98 // ABA problem here.
99 Atomic::cmpxchg(oop(NULL), p, obj);
100 }
101}
102
103inline void ZPhantomCleanOopClosure::do_oop(narrowOop* p) {
104 ShouldNotReachHere();
105}
106
107#endif // SHARE_GC_Z_ZOOPCLOSURES_INLINE_HPP
108