1/*
2 * Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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7 * published by the Free Software Foundation.
8 *
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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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23 */
24
25#ifndef SHARE_GC_G1_G1BARRIERSET_INLINE_HPP
26#define SHARE_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
35template <DecoratorSet decorators, typename T>
36inline void G1BarrierSet::write_ref_field_pre(T* field) {
37 if (HasDecorator<decorators, IS_DEST_UNINITIALIZED>::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
48template <DecoratorSet decorators, typename T>
49inline void G1BarrierSet::write_ref_field_post(T* field, oop new_val) {
50 volatile CardValue* 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
57inline void G1BarrierSet::enqueue_if_weak(DecoratorSet decorators, oop value) {
58 assert((decorators & ON_UNKNOWN_OOP_REF) == 0, "Reference strength must be known");
59 // Loading from a weak or phantom reference needs enqueueing, as
60 // the object may not have been reachable (part of the snapshot)
61 // when marking started.
62 const bool on_strong_oop_ref = (decorators & ON_STRONG_OOP_REF) != 0;
63 const bool peek = (decorators & AS_NO_KEEPALIVE) != 0;
64 const bool needs_enqueue = (!peek && !on_strong_oop_ref);
65
66 if (needs_enqueue && value != NULL) {
67 enqueue(value);
68 }
69}
70
71template <DecoratorSet decorators, typename BarrierSetT>
72template <typename T>
73inline oop G1BarrierSet::AccessBarrier<decorators, BarrierSetT>::
74oop_load_not_in_heap(T* addr) {
75 oop value = ModRef::oop_load_not_in_heap(addr);
76 enqueue_if_weak(decorators, value);
77 return value;
78}
79
80template <DecoratorSet decorators, typename BarrierSetT>
81template <typename T>
82inline oop G1BarrierSet::AccessBarrier<decorators, BarrierSetT>::
83oop_load_in_heap(T* addr) {
84 oop value = ModRef::oop_load_in_heap(addr);
85 enqueue_if_weak(decorators, value);
86 return value;
87}
88
89template <DecoratorSet decorators, typename BarrierSetT>
90inline oop G1BarrierSet::AccessBarrier<decorators, BarrierSetT>::
91oop_load_in_heap_at(oop base, ptrdiff_t offset) {
92 oop value = ModRef::oop_load_in_heap_at(base, offset);
93 enqueue_if_weak(AccessBarrierSupport::resolve_possibly_unknown_oop_ref_strength<decorators>(base, offset), value);
94 return value;
95}
96
97template <DecoratorSet decorators, typename BarrierSetT>
98template <typename T>
99inline void G1BarrierSet::AccessBarrier<decorators, BarrierSetT>::
100oop_store_not_in_heap(T* addr, oop new_value) {
101 // Apply SATB barriers for all non-heap references, to allow
102 // concurrent scanning of such references.
103 G1BarrierSet *bs = barrier_set_cast<G1BarrierSet>(BarrierSet::barrier_set());
104 bs->write_ref_field_pre<decorators>(addr);
105 Raw::oop_store(addr, new_value);
106}
107
108#endif // SHARE_GC_G1_G1BARRIERSET_INLINE_HPP
109