1 /*
2 * Copyright (c) 2000, 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_SERIAL_MARKSWEEP_INLINE_HPP
26 #define SHARE_GC_SERIAL_MARKSWEEP_INLINE_HPP
27
28 #include "gc/serial/markSweep.hpp"
29
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "gc/shared/slidingForwarding.inline.hpp"
32 #include "memory/universe.hpp"
33 #include "oops/markWord.inline.hpp"
34 #include "oops/access.inline.hpp"
35 #include "oops/compressedOops.inline.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "utilities/align.hpp"
38 #include "utilities/stack.inline.hpp"
39
40 inline void MarkSweep::mark_object(oop obj) {
41 // some marks may contain information we need to preserve so we store them away
42 // and overwrite the mark. We'll restore it at the end of markSweep.
43 markWord mark = obj->mark();
44 obj->set_mark(obj->prototype_mark().set_marked());
45
46 if (obj->mark_must_be_preserved(mark)) {
47 preserve_mark(obj, mark);
48 }
49 }
50
51 template <class T> inline void MarkSweep::mark_and_push(T* p) {
52 T heap_oop = RawAccess<>::oop_load(p);
53 if (!CompressedOops::is_null(heap_oop)) {
54 oop obj = CompressedOops::decode_not_null(heap_oop);
55 if (!obj->mark().is_marked()) {
56 mark_object(obj);
57 _marking_stack.push(obj);
58 }
59 }
60 }
61
62 inline void MarkSweep::follow_klass(Klass* klass) {
63 oop op = klass->class_loader_data()->holder_no_keepalive();
64 MarkSweep::mark_and_push(&op);
65 }
66
67 inline void MarkSweep::follow_cld(ClassLoaderData* cld) {
68 MarkSweep::follow_cld_closure.do_cld(cld);
69 }
70
71 template <typename T>
72 inline void MarkAndPushClosure::do_oop_work(T* p) { MarkSweep::mark_and_push(p); }
73 inline void MarkAndPushClosure::do_oop(oop* p) { do_oop_work(p); }
74 inline void MarkAndPushClosure::do_oop(narrowOop* p) { do_oop_work(p); }
75 inline void MarkAndPushClosure::do_klass(Klass* k) { MarkSweep::follow_klass(k); }
76 inline void MarkAndPushClosure::do_cld(ClassLoaderData* cld) { MarkSweep::follow_cld(cld); }
77
78 template <bool ALT_FWD, class T>
79 inline void MarkSweep::adjust_pointer(T* p) {
80 T heap_oop = RawAccess<>::oop_load(p);
81 if (!CompressedOops::is_null(heap_oop)) {
82 oop obj = CompressedOops::decode_not_null(heap_oop);
83 assert(Universe::heap()->is_in(obj), "should be in heap");
84
85 if (SlidingForwarding::is_forwarded(obj)) {
86 oop new_obj = SlidingForwarding::forwardee<ALT_FWD>(obj);
87 assert(new_obj != NULL, "must be forwarded");
88 assert(is_object_aligned(new_obj), "oop must be aligned");
89 RawAccess<IS_NOT_NULL>::oop_store(p, new_obj);
90 }
91 }
92 }
93
94 template <bool ALT_FWD>
95 template <typename T>
96 void AdjustPointerClosure<ALT_FWD>::do_oop_work(T* p) { MarkSweep::adjust_pointer<ALT_FWD>(p); }
97
98 template <bool ALT_FWD>
99 inline void AdjustPointerClosure<ALT_FWD>::do_oop(oop* p) { do_oop_work(p); }
100
101 template <bool ALT_FWD>
102 inline void AdjustPointerClosure<ALT_FWD>::do_oop(narrowOop* p) { do_oop_work(p); }
103
104 template <bool ALT_FWD>
105 inline int MarkSweep::adjust_pointers(oop obj) {
106 AdjustPointerClosure<ALT_FWD> adjust_pointer_closure;
107 return obj->oop_iterate_size(&adjust_pointer_closure);
108 }
109
110 #endif // SHARE_GC_SERIAL_MARKSWEEP_INLINE_HPP