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 inline OopsInGenClosure::OopsInGenClosure(Generation* gen) :
41 OopIterateClosure(gen->ref_processor()), _orig_gen(gen), _rs(NULL) {
42 set_generation(gen);
43 }
44
45 inline void OopsInGenClosure::set_generation(Generation* gen) {
46 _gen = gen;
47 _gen_boundary = _gen->reserved().start();
48 // Barrier set for the heap, must be set after heap is initialized
49 if (_rs == NULL) {
50 _rs = GenCollectedHeap::heap()->rem_set();
51 }
52 }
53
54 template <class T> inline void OopsInGenClosure::do_barrier(T* p) {
55 assert(generation()->is_in_reserved(p), "expected ref in generation");
56 T heap_oop = RawAccess<>::oop_load(p);
57 assert(!CompressedOops::is_null(heap_oop), "expected non-null oop");
58 oop obj = CompressedOops::decode_not_null(heap_oop);
59 // If p points to a younger generation, mark the card.
60 if ((HeapWord*)obj < _gen_boundary) {
61 _rs->inline_write_ref_field_gc(p, obj);
62 }
63 }
64
65 template <class T> inline void OopsInGenClosure::par_do_barrier(T* p) {
66 assert(generation()->is_in_reserved(p), "expected ref in generation");
67 T heap_oop = RawAccess<>::oop_load(p);
68 assert(!CompressedOops::is_null(heap_oop), "expected non-null oop");
69 oop obj = CompressedOops::decode_not_null(heap_oop);
70 // If p points to a younger generation, mark the card.
71 if ((HeapWord*)obj < gen_boundary()) {
72 rs()->write_ref_field_gc_par(p, obj);
73 }
74 }
75
76 inline BasicOopsInGenClosure::BasicOopsInGenClosure(Generation* gen) : OopsInGenClosure(gen) {
77 }
78
79 inline void OopsInClassLoaderDataOrGenClosure::do_cld_barrier() {
80 assert(_scanned_cld != NULL, "Must be");
81 if (!_scanned_cld->has_modified_oops()) {
82 _scanned_cld->record_modified_oops();
83 }
84 }
85
86 #if INCLUDE_SERIALGC
87
88 // NOTE! Any changes made here should also be made
89 // in FastScanClosure::do_oop_work()
90 template <class T> inline void ScanClosure::do_oop_work(T* p) {
91 T heap_oop = RawAccess<>::oop_load(p);
92 // Should we copy the obj?
93 if (!CompressedOops::is_null(heap_oop)) {
94 oop obj = CompressedOops::decode_not_null(heap_oop);
95 if ((HeapWord*)obj < _boundary) {
96 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?");
97 oop new_obj = obj->is_forwarded() ? obj->forwardee()
98 : _g->copy_to_survivor_space(obj);
99 RawAccess<IS_NOT_NULL>::oop_store(p, new_obj);
100 }
101
102 if (is_scanning_a_cld()) {
103 do_cld_barrier();
104 } else if (_gc_barrier) {
105 // Now call parent closure
106 do_barrier(p);
107 }
108 }
109 }
110
111 inline void ScanClosure::do_oop(oop* p) { ScanClosure::do_oop_work(p); }
112 inline void ScanClosure::do_oop(narrowOop* p) { ScanClosure::do_oop_work(p); }
113
114 // NOTE! Any changes made here should also be made
115 // in ScanClosure::do_oop_work()
116 template <class T> inline void FastScanClosure::do_oop_work(T* p) {
117 T heap_oop = RawAccess<>::oop_load(p);
118 // Should we copy the obj?
119 if (!CompressedOops::is_null(heap_oop)) {
120 oop obj = CompressedOops::decode_not_null(heap_oop);
121 if ((HeapWord*)obj < _boundary) {
122 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?");
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 if (is_scanning_a_cld()) {
127 do_cld_barrier();
128 } else if (_gc_barrier) {
129 // Now call parent closure
130 do_barrier(p);
131 }
132 }
133 }
134 }
135
136 inline void FastScanClosure::do_oop(oop* p) { FastScanClosure::do_oop_work(p); }
137 inline void FastScanClosure::do_oop(narrowOop* p) { FastScanClosure::do_oop_work(p); }
138
139 #endif // INCLUDE_SERIALGC
140
141 template <class T> void FilteringClosure::do_oop_work(T* p) {
142 T heap_oop = RawAccess<>::oop_load(p);
143 if (!CompressedOops::is_null(heap_oop)) {
144 oop obj = CompressedOops::decode_not_null(heap_oop);
145 if ((HeapWord*)obj < _boundary) {
146 _cl->do_oop(p);
147 }
148 }
149 }
150
151 inline void FilteringClosure::do_oop(oop* p) { FilteringClosure::do_oop_work(p); }
152 inline void FilteringClosure::do_oop(narrowOop* p) { FilteringClosure::do_oop_work(p); }
153
154 #if INCLUDE_SERIALGC
155
156 // Note similarity to ScanClosure; the difference is that
157 // the barrier set is taken care of outside this closure.
158 template <class T> inline void ScanWeakRefClosure::do_oop_work(T* p) {
159 oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);
160 // weak references are sometimes scanned twice; must check
161 // that to-space doesn't already contain this object
162 if ((HeapWord*)obj < _boundary && !_g->to()->is_in_reserved(obj)) {
163 oop new_obj = obj->is_forwarded() ? obj->forwardee()
164 : _g->copy_to_survivor_space(obj);
165 RawAccess<IS_NOT_NULL>::oop_store(p, new_obj);
166 }
167 }
168
169 inline void ScanWeakRefClosure::do_oop(oop* p) { ScanWeakRefClosure::do_oop_work(p); }
170 inline void ScanWeakRefClosure::do_oop(narrowOop* p) { ScanWeakRefClosure::do_oop_work(p); }
171
172 #endif // INCLUDE_SERIALGC
173
174 #endif // SHARE_GC_SHARED_GENOOPCLOSURES_INLINE_HPP