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 #endif // INCLUDE_ALL_GCS
41
42 inline void MarkSweep::mark_object(oop obj) {
43 #if INCLUDE_ALL_GCS
44 if (G1StringDedup::is_enabled()) {
45 // We must enqueue the object before it is marked
46 // as we otherwise can't read the object's age.
47 G1StringDedup::enqueue_from_mark(obj);
48 }
49 #endif
50 // some marks may contain information we need to preserve so we store them away
51 // and overwrite the mark. We'll restore it at the end of markSweep.
52 markOop mark = obj->mark();
53 obj->set_mark(markOopDesc::prototype()->set_marked());
54
55 if (mark->must_be_preserved(obj)) {
56 preserve_mark(obj, mark);
57 }
58 }
59
60 inline void MarkSweep::follow_klass(Klass* klass) {
61 oop op = klass->klass_holder();
62 MarkSweep::mark_and_push(&op);
63 }
64
65 inline void MarkSweep::follow_object(oop obj) {
66 assert(obj->is_gc_marked(), "should be marked");
67
68 obj->ms_follow_contents();
69 }
70
71 template <class T> inline void MarkSweep::follow_root(T* p) {
72 assert(!Universe::heap()->is_in_reserved(p),
73 "roots shouldn't be things within the heap");
74 T heap_oop = oopDesc::load_heap_oop(p);
75 if (!oopDesc::is_null(heap_oop)) {
76 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
77 if (!obj->mark()->is_marked()) {
78 mark_object(obj);
79 follow_object(obj);
80 }
81 }
82 follow_stack();
83 }
84
85 template <class T> inline void MarkSweep::mark_and_push(T* p) {
86 // assert(Universe::heap()->is_in_reserved(p), "should be in object space");
87 T heap_oop = oopDesc::load_heap_oop(p);
88 if (!oopDesc::is_null(heap_oop)) {
89 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
90 if (!obj->mark()->is_marked()) {
91 mark_object(obj);
92 _marking_stack.push(obj);
93 }
94 }
95 }
96
97 void MarkSweep::push_objarray(oop obj, size_t index) {
98 ObjArrayTask task(obj, index);
99 assert(task.is_valid(), "bad ObjArrayTask");
100 _objarray_stack.push(task);
101 }
102
103 inline int MarkSweep::adjust_pointers(oop obj) {
104 return obj->ms_adjust_pointers();
105 }
106
107 template <class T> inline void MarkSweep::adjust_pointer(T* p) {
108 T heap_oop = oopDesc::load_heap_oop(p);
109 if (!oopDesc::is_null(heap_oop)) {
110 oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
111 assert(Universe::heap()->is_in(obj), "should be in heap");
112
113 oop new_obj = oop(obj->mark()->decode_pointer());
114 assert(new_obj != NULL || // is forwarding ptr?
115 obj->mark() == markOopDesc::prototype() || // not gc marked?
116 (UseBiasedLocking && obj->mark()->has_bias_pattern()),
117 // not gc marked?
118 "should be forwarded");
119 if (new_obj != NULL) {
120 assert(Universe::heap()->is_in_reserved(new_obj),
121 "should be in object space");
122 oopDesc::encode_store_heap_oop_not_null(p, new_obj);
123 }
124 }
125 }
126
127 template <class T> inline void MarkSweep::KeepAliveClosure::do_oop_work(T* p) {
128 mark_and_push(p);
129 }
130
131 #endif // SHARE_VM_GC_SERIAL_MARKSWEEP_INLINE_HPP