1 /*
2 * Copyright (c) 2001, 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.
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_GC_SHARED_GENOOPCLOSURES_INLINE_HPP
26 #define SHARE_GC_SHARED_GENOOPCLOSURES_INLINE_HPP
27
28 #include "gc/shared/cardTableRS.hpp"
29 #include "gc/shared/genCollectedHeap.hpp"
30 #include "gc/shared/genOopClosures.hpp"
31 #include "gc/shared/generation.hpp"
32 #include "gc/shared/space.hpp"
33 #include "oops/access.inline.hpp"
34 #include "oops/compressedOops.inline.hpp"
35 #include "oops/oop.inline.hpp"
36 #if INCLUDE_SERIALGC
37 #include "gc/serial/defNewGeneration.inline.hpp"
38 #endif
39
40 #if INCLUDE_SERIALGC
41
42 template <typename Derived>
43 inline FastScanClosure<Derived>::FastScanClosure(DefNewGeneration* g) :
44 BasicOopIterateClosure(g->ref_processor()),
45 _young_gen(g),
46 _young_gen_end(g->reserved().end()) {}
47
48 template <typename Derived>
49 template <typename T>
50 inline void FastScanClosure<Derived>::do_oop_work(T* p) {
51 T heap_oop = RawAccess<>::oop_load(p);
52 // Should we copy the obj?
53 if (!CompressedOops::is_null(heap_oop)) {
54 oop obj = CompressedOops::decode_not_null(heap_oop);
55 if (cast_from_oop<HeapWord*>(obj) < _young_gen_end) {
56 assert(!_young_gen->to()->is_in_reserved(obj), "Scanning field twice?");
57 oop new_obj = obj->is_forwarded() ? obj->forwardee()
58 : _young_gen->copy_to_survivor_space(obj);
59 RawAccess<IS_NOT_NULL>::oop_store(p, new_obj);
60
61 static_cast<Derived*>(this)->barrier(p);
62 }
63 }
64 }
65
66 template <typename Derived>
67 inline void FastScanClosure<Derived>::do_oop(oop* p) { do_oop_work(p); }
68 template <typename Derived>
69 inline void FastScanClosure<Derived>::do_oop(narrowOop* p) { do_oop_work(p); }
70
71 inline DefNewYoungerGenClosure::DefNewYoungerGenClosure(DefNewGeneration* young_gen, Generation* old_gen) :
72 FastScanClosure<DefNewYoungerGenClosure>(young_gen),
73 _old_gen(old_gen),
74 _old_gen_start(old_gen->reserved().start()),
75 _rs(GenCollectedHeap::heap()->rem_set()) {}
76
77 template <typename T>
78 void DefNewYoungerGenClosure::barrier(T* p) {
79 assert(_old_gen->is_in_reserved(p), "expected ref in generation");
80 T heap_oop = RawAccess<>::oop_load(p);
81 assert(!CompressedOops::is_null(heap_oop), "expected non-null oop");
82 oop obj = CompressedOops::decode_not_null(heap_oop);
83 // If p points to a younger generation, mark the card.
84 if (cast_from_oop<HeapWord*>(obj) < _old_gen_start) {
85 _rs->inline_write_ref_field_gc(p, obj);
86 }
87 }
88
89 inline DefNewScanClosure::DefNewScanClosure(DefNewGeneration* g) :
90 FastScanClosure<DefNewScanClosure>(g), _scanned_cld(NULL) {}
91
92 template <class T>
93 void DefNewScanClosure::barrier(T* p) {
94 if (_scanned_cld != NULL && !_scanned_cld->has_modified_oops()) {
95 _scanned_cld->record_modified_oops();
96 }
97 }
98
99 #endif // INCLUDE_SERIALGC
100
101 template <class T> void FilteringClosure::do_oop_work(T* p) {
102 T heap_oop = RawAccess<>::oop_load(p);
103 if (!CompressedOops::is_null(heap_oop)) {
104 oop obj = CompressedOops::decode_not_null(heap_oop);
105 if (cast_from_oop<HeapWord*>(obj) < _boundary) {
106 _cl->do_oop(p);
107 }
108 }
109 }
110
111 inline void FilteringClosure::do_oop(oop* p) { FilteringClosure::do_oop_work(p); }
112 inline void FilteringClosure::do_oop(narrowOop* p) { FilteringClosure::do_oop_work(p); }
113
114 #if INCLUDE_SERIALGC
115
116 // Note similarity to FastScanClosure; the difference is that
117 // the barrier set is taken care of outside this closure.
118 template <class T> inline void ScanWeakRefClosure::do_oop_work(T* p) {
119 oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);
120 // weak references are sometimes scanned twice; must check
121 // that to-space doesn't already contain this object
122 if (cast_from_oop<HeapWord*>(obj) < _boundary && !_g->to()->is_in_reserved(obj)) {
123 oop new_obj = obj->is_forwarded() ? obj->forwardee()
124 : _g->copy_to_survivor_space(obj);
125 RawAccess<IS_NOT_NULL>::oop_store(p, new_obj);
126 }
127 }
128
129 inline void ScanWeakRefClosure::do_oop(oop* p) { ScanWeakRefClosure::do_oop_work(p); }
130 inline void ScanWeakRefClosure::do_oop(narrowOop* p) { ScanWeakRefClosure::do_oop_work(p); }
131
132 #endif // INCLUDE_SERIALGC
133
134 #endif // SHARE_GC_SHARED_GENOOPCLOSURES_INLINE_HPP