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 (cast_from_oop<HeapWord*>(obj) < _gen_boundary) {
61 _rs->inline_write_ref_field_gc(p, obj);
62 }
63 }
64
65 inline BasicOopsInGenClosure::BasicOopsInGenClosure(Generation* gen) : OopsInGenClosure(gen) {
66 }
67
68 inline void OopsInClassLoaderDataOrGenClosure::do_cld_barrier() {
69 assert(_scanned_cld != NULL, "Must be");
70 if (!_scanned_cld->has_modified_oops()) {
71 _scanned_cld->record_modified_oops();
72 }
73 }
74
75 #if INCLUDE_SERIALGC
76
77 template <class T> inline void FastScanClosure::do_oop_work(T* p) {
78 T heap_oop = RawAccess<>::oop_load(p);
79 // Should we copy the obj?
80 if (!CompressedOops::is_null(heap_oop)) {
81 oop obj = CompressedOops::decode_not_null(heap_oop);
82 if (cast_from_oop<HeapWord*>(obj) < _boundary) {
83 assert(!_g->to()->is_in_reserved(obj), "Scanning field twice?");
84 oop new_obj = obj->is_forwarded() ? obj->forwardee()
85 : _g->copy_to_survivor_space(obj);
86 RawAccess<IS_NOT_NULL>::oop_store(p, new_obj);
87 if (is_scanning_a_cld()) {
88 do_cld_barrier();
89 } else if (_gc_barrier) {
90 // Now call parent closure
91 do_barrier(p);
92 }
93 }
94 }
95 }
96
97 inline void FastScanClosure::do_oop(oop* p) { FastScanClosure::do_oop_work(p); }
98 inline void FastScanClosure::do_oop(narrowOop* p) { FastScanClosure::do_oop_work(p); }
99
100 #endif // INCLUDE_SERIALGC
101
102 template <class T> void FilteringClosure::do_oop_work(T* p) {
103 T heap_oop = RawAccess<>::oop_load(p);
104 if (!CompressedOops::is_null(heap_oop)) {
105 oop obj = CompressedOops::decode_not_null(heap_oop);
106 if (cast_from_oop<HeapWord*>(obj) < _boundary) {
107 _cl->do_oop(p);
108 }
109 }
110 }
111
112 inline void FilteringClosure::do_oop(oop* p) { FilteringClosure::do_oop_work(p); }
113 inline void FilteringClosure::do_oop(narrowOop* p) { FilteringClosure::do_oop_work(p); }
114
115 #if INCLUDE_SERIALGC
116
117 // Note similarity to FastScanClosure; the difference is that
118 // the barrier set is taken care of outside this closure.
119 template <class T> inline void ScanWeakRefClosure::do_oop_work(T* p) {
120 oop obj = RawAccess<IS_NOT_NULL>::oop_load(p);
121 // weak references are sometimes scanned twice; must check
122 // that to-space doesn't already contain this object
123 if (cast_from_oop<HeapWord*>(obj) < _boundary && !_g->to()->is_in_reserved(obj)) {
124 oop new_obj = obj->is_forwarded() ? obj->forwardee()
125 : _g->copy_to_survivor_space(obj);
126 RawAccess<IS_NOT_NULL>::oop_store(p, new_obj);
127 }
128 }
129
130 inline void ScanWeakRefClosure::do_oop(oop* p) { ScanWeakRefClosure::do_oop_work(p); }
131 inline void ScanWeakRefClosure::do_oop(narrowOop* p) { ScanWeakRefClosure::do_oop_work(p); }
132
133 #endif // INCLUDE_SERIALGC
134
135 #endif // SHARE_GC_SHARED_GENOOPCLOSURES_INLINE_HPP