1 /*
2 * Copyright (c) 2000, 2015, 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_VM_GC_SERIAL_MARKSWEEP_INLINE_HPP
26 #define SHARE_VM_GC_SERIAL_MARKSWEEP_INLINE_HPP
27
28 #include "gc/serial/markSweep.hpp"
29 #include "gc/shared/collectedHeap.hpp"
30 #include "oops/instanceClassLoaderKlass.inline.hpp"
31 #include "oops/instanceKlass.inline.hpp"
32 #include "oops/instanceMirrorKlass.inline.hpp"
33 #include "oops/instanceRefKlass.inline.hpp"
34 #include "oops/markOop.inline.hpp"
35 #include "oops/objArrayKlass.inline.hpp"
36 #include "utilities/macros.hpp"
37 #include "utilities/stack.inline.hpp"
38 #if INCLUDE_ALL_GCS
39 #include "gc/g1/g1StringDedup.hpp"
40 #include "gc/g1/g1MarkSweep.hpp"
41 #endif // INCLUDE_ALL_GCS
42
43 inline void MarkSweep::mark_object(oop obj) {
44 #if INCLUDE_ALL_GCS
45 if (G1StringDedup::is_enabled()) {
46 // We must enqueue the object before it is marked
47 // as we otherwise can't read the object's age.
48 G1StringDedup::enqueue_from_mark(obj);
49 }
50 #endif
51 // some marks may contain information we need to preserve so we store them away
52 // and overwrite the mark. We'll restore it at the end of markSweep.
53 markOop mark = obj->mark();
54 obj->set_mark(markOopDesc::prototype()->set_marked());
55
56 if (mark->must_be_preserved(obj)) {
57 preserve_mark(obj, mark);
58 }
59 }
60
61 inline bool MarkSweep::is_archive_object(oop object) {
62 #if INCLUDE_ALL_GCS
63 return (G1MarkSweep::archive_check_enabled() &&
64 G1MarkSweep::in_archive_range(object));
65 #else
66 return false;
67 #endif
68 }
69
70 inline void MarkSweep::follow_klass(Klass* klass) {
71 oop op = klass->klass_holder();
72 MarkSweep::mark_and_push(&op);
73 }
74
75 inline void MarkSweep::follow_cld(ClassLoaderData* cld) {
76 MarkSweep::follow_cld_closure.do_cld(cld);
77 }
78
79 inline void MarkSweep::follow_object(oop obj) {
80 assert(obj->is_gc_marked(), "should be marked");
81
82 obj->oop_iterate(&mark_and_push_closure);
83 }
84
85 template <class T> inline void MarkSweep::follow_root(T* p) {
86 assert(!Universe::heap()->is_in_reserved(p),
87 "roots shouldn't be things within the heap");
88 T heap_oop = oopDesc::load_heap_oop(p);
89 if (!oopDesc::is_null(heap_oop)) {
90 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
91 if (!obj->mark()->is_marked() &&
92 !is_archive_object(obj)) {
93 mark_object(obj);
94 follow_object(obj);
95 }
96 }
97 follow_stack();
98 }
99
100 template <class T> inline void MarkSweep::mark_and_push(T* p) {
101 // assert(Universe::heap()->is_in_reserved(p), "should be in object space");
102 T heap_oop = oopDesc::load_heap_oop(p);
103 if (!oopDesc::is_null(heap_oop)) {
104 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
105 if (!obj->mark()->is_marked() &&
106 !is_archive_object(obj)) {
107 mark_object(obj);
108 _marking_stack.push(obj);
109 }
110 }
111 }
112
113 void MarkSweep::push_objarray(oop obj, size_t index) {
114 ObjArrayTask task(obj, index);
115 assert(task.is_valid(), "bad ObjArrayTask");
116 _objarray_stack.push(task);
117 }
118
119 inline int MarkSweep::adjust_pointers(oop obj) {
120 return obj->ms_adjust_pointers();
121 }
122
123 template <class T> inline void MarkSweep::adjust_pointer(T* p) {
124 T heap_oop = oopDesc::load_heap_oop(p);
125 if (!oopDesc::is_null(heap_oop)) {
126 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
127 assert(Universe::heap()->is_in(obj), "should be in heap");
128
129 oop new_obj = oop(obj->mark()->decode_pointer());
130 assert(is_archive_object(obj) || // no forwarding of archive objects
131 new_obj != NULL || // is forwarding ptr?
132 obj->mark() == markOopDesc::prototype() || // not gc marked?
133 (UseBiasedLocking && obj->mark()->has_bias_pattern()),
134 // not gc marked?
135 "should be forwarded");
136 if (new_obj != NULL) {
137 if (!is_archive_object(obj)) {
138 assert(Universe::heap()->is_in_reserved(new_obj),
139 "should be in object space");
140 oopDesc::encode_store_heap_oop_not_null(p, new_obj);
141 }
142 }
143 }
144 }
145
146 template <class T> inline void MarkSweep::KeepAliveClosure::do_oop_work(T* p) {
147 mark_and_push(p);
148 }
149
150 #endif // SHARE_VM_GC_SERIAL_MARKSWEEP_INLINE_HPP