1 /*
2 * Copyright (c) 2016, 2018, 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_GC_G1_G1BARRIERSET_INLINE_HPP
26 #define SHARE_VM_GC_G1_G1BARRIERSET_INLINE_HPP
27
28 #include "gc/g1/g1BarrierSet.hpp"
29 #include "gc/g1/g1CardTable.hpp"
30 #include "gc/shared/accessBarrierSupport.inline.hpp"
31 #include "oops/access.inline.hpp"
32 #include "oops/compressedOops.inline.hpp"
33 #include "oops/oop.hpp"
34
35 template <DecoratorSet decorators, typename T>
36 inline void G1BarrierSet::write_ref_field_pre(T* field) {
37 if (HasDecorator<decorators, AS_DEST_NOT_INITIALIZED>::value ||
38 HasDecorator<decorators, AS_NO_KEEPALIVE>::value) {
39 return;
40 }
41
42 T heap_oop = RawAccess<MO_VOLATILE>::oop_load(field);
43 if (!CompressedOops::is_null(heap_oop)) {
44 enqueue(CompressedOops::decode_not_null(heap_oop));
45 }
46 }
47
48 template <DecoratorSet decorators, typename T>
49 inline void G1BarrierSet::write_ref_field_post(T* field, oop new_val) {
50 volatile jbyte* byte = _card_table->byte_for(field);
51 if (*byte != G1CardTable::g1_young_card_val()) {
52 // Take a slow path for cards in old
53 write_ref_field_post_slow(byte);
54 }
55 }
56
57 inline void G1BarrierSet::enqueue_if_weak_or_archive(DecoratorSet decorators, oop value) {
58 assert((decorators & ON_UNKNOWN_OOP_REF) == 0, "Reference strength must be known");
59 // Archive roots need to be enqueued since they add subgraphs to the
60 // Java heap that were not there at the snapshot when marking started.
61 // Weak and phantom references also need enqueueing for similar reasons.
62 const bool in_archive_root = (decorators & IN_ARCHIVE_ROOT) != 0;
63 const bool on_strong_oop_ref = (decorators & ON_STRONG_OOP_REF) != 0;
64 const bool peek = (decorators & AS_NO_KEEPALIVE) != 0;
65 const bool needs_enqueue = in_archive_root || (!peek && !on_strong_oop_ref);
66
67 if (needs_enqueue && value != NULL) {
68 enqueue(value);
69 }
70 }
71
72 template <DecoratorSet decorators, typename BarrierSetT>
73 template <typename T>
74 inline oop G1BarrierSet::AccessBarrier<decorators, BarrierSetT>::
75 oop_load_not_in_heap(T* addr) {
76 oop value = ModRef::oop_load_not_in_heap(addr);
77 enqueue_if_weak_or_archive(decorators, value);
78 return value;
79 }
80
81 template <DecoratorSet decorators, typename BarrierSetT>
82 template <typename T>
83 inline oop G1BarrierSet::AccessBarrier<decorators, BarrierSetT>::
84 oop_load_in_heap(T* addr) {
85 oop value = ModRef::oop_load_in_heap(addr);
86 enqueue_if_weak_or_archive(decorators, value);
87 return value;
88 }
89
90 template <DecoratorSet decorators, typename BarrierSetT>
91 inline oop G1BarrierSet::AccessBarrier<decorators, BarrierSetT>::
92 oop_load_in_heap_at(oop base, ptrdiff_t offset) {
93 oop value = ModRef::oop_load_in_heap_at(base, offset);
94 enqueue_if_weak_or_archive(AccessBarrierSupport::resolve_possibly_unknown_oop_ref_strength<decorators>(base, offset), value);
95 return value;
96 }
97
98 template <DecoratorSet decorators, typename BarrierSetT>
99 template <typename T>
100 inline void G1BarrierSet::AccessBarrier<decorators, BarrierSetT>::
101 oop_store_not_in_heap(T* addr, oop new_value) {
102 if (HasDecorator<decorators, IN_CONCURRENT_ROOT>::value) {
103 // For roots not scanned in a safepoint, we have to apply SATB barriers
104 // even for roots.
105 G1BarrierSet *bs = barrier_set_cast<G1BarrierSet>(BarrierSet::barrier_set());
106 bs->write_ref_field_pre<decorators>(addr);
107 }
108 Raw::oop_store(addr, new_value);
109 }
110
111 #endif // SHARE_VM_GC_G1_G1BARRIERSET_INLINE_HPP