1 /*
2 * Copyright (c) 2015, 2020, 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.
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23 */
24
25 #ifndef SHARE_OOPS_INSTANCEMIRRORKLASS_INLINE_HPP
26 #define SHARE_OOPS_INSTANCEMIRRORKLASS_INLINE_HPP
27
28 #include "classfile/javaClasses.hpp"
29 #include "oops/instanceKlass.inline.hpp"
30 #include "oops/instanceMirrorKlass.hpp"
31 #include "oops/klass.hpp"
32 #include "oops/oop.inline.hpp"
33 #include "utilities/debug.hpp"
34 #include "utilities/globalDefinitions.hpp"
35 #include "utilities/macros.hpp"
36
37 template <typename T, class OopClosureType>
38 void InstanceMirrorKlass::oop_oop_iterate_statics(oop obj, OopClosureType* closure) {
39 T* p = (T*)start_of_static_fields(obj);
40 T* const end = p + java_lang_Class::static_oop_field_count_raw(obj);
41
42 for (; p < end; ++p) {
43 Devirtualizer::do_oop(closure, p);
44 }
45 }
46
47 template <typename T, class OopClosureType>
48 void InstanceMirrorKlass::oop_oop_iterate(oop obj, OopClosureType* closure) {
49 InstanceKlass::oop_oop_iterate<T>(obj, closure);
50
51 if (Devirtualizer::do_metadata(closure)) {
52 Klass* klass = java_lang_Class::as_Klass_raw(obj);
53 // We'll get NULL for primitive mirrors.
54 if (klass != NULL) {
55 if (klass->is_instance_klass() && klass->class_loader_data()->has_class_mirror_holder()) {
56 // A non-strong hidden class or an unsafe anonymous class doesn't have its own class loader,
57 // so when handling the java mirror for the class we need to make sure its class
58 // loader data is claimed, this is done by calling do_cld explicitly.
59 // For non-anonymous classes the call to do_cld is made when the class
60 // loader itself is handled.
61 Devirtualizer::do_cld(closure, klass->class_loader_data());
62 } else {
63 Devirtualizer::do_klass(closure, klass);
64 }
65 } else {
66 // We would like to assert here (as below) that if klass has been NULL, then
67 // this has been a mirror for a primitive type that we do not need to follow
68 // as they are always strong roots.
69 // However, we might get across a klass that just changed during CMS concurrent
70 // marking if allocation occurred in the old generation.
71 // This is benign here, as we keep alive all CLDs that were loaded during the
72 // CMS concurrent phase in the class loading, i.e. they will be iterated over
73 // and kept alive during remark.
74 // assert(java_lang_Class::is_primitive(obj), "Sanity check");
75 }
76 }
77
78 oop_oop_iterate_statics<T>(obj, closure);
79 }
80
81 template <typename T, class OopClosureType>
82 void InstanceMirrorKlass::oop_oop_iterate_reverse(oop obj, OopClosureType* closure) {
83 InstanceKlass::oop_oop_iterate_reverse<T>(obj, closure);
84
85 InstanceMirrorKlass::oop_oop_iterate_statics<T>(obj, closure);
86 }
87
88 template <typename T, class OopClosureType>
89 void InstanceMirrorKlass::oop_oop_iterate_statics_bounded(oop obj,
90 OopClosureType* closure,
91 MemRegion mr) {
92 T* p = (T*)start_of_static_fields(obj);
93 T* end = p + java_lang_Class::static_oop_field_count_raw(obj);
94
95 T* const l = (T*)mr.start();
96 T* const h = (T*)mr.end();
97 assert(mask_bits((intptr_t)l, sizeof(T)-1) == 0 &&
98 mask_bits((intptr_t)h, sizeof(T)-1) == 0,
99 "bounded region must be properly aligned");
100
101 if (p < l) {
102 p = l;
103 }
104 if (end > h) {
105 end = h;
106 }
107
108 for (;p < end; ++p) {
109 Devirtualizer::do_oop(closure, p);
110 }
111 }
112
113 template <typename T, class OopClosureType>
114 void InstanceMirrorKlass::oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr) {
115 InstanceKlass::oop_oop_iterate_bounded<T>(obj, closure, mr);
116
117 if (Devirtualizer::do_metadata(closure)) {
118 if (mr.contains(obj)) {
119 Klass* klass = java_lang_Class::as_Klass_raw(obj);
120 // We'll get NULL for primitive mirrors.
121 if (klass != NULL) {
122 Devirtualizer::do_klass(closure, klass);
123 }
124 }
125 }
126
127 oop_oop_iterate_statics_bounded<T>(obj, closure, mr);
128 }
129
130 #endif // SHARE_OOPS_INSTANCEMIRRORKLASS_INLINE_HPP