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