1 /* Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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23
24 #ifndef SHARE_OOPS_INSTANCEMIRRORKLASS_INLINE_HPP
25 #define SHARE_OOPS_INSTANCEMIRRORKLASS_INLINE_HPP
26
27 #include "classfile/javaClasses.hpp"
28 #include "oops/instanceKlass.inline.hpp"
29 #include "oops/instanceMirrorKlass.hpp"
30 #include "oops/klass.hpp"
31 #include "oops/oop.inline.hpp"
32 #include "utilities/debug.hpp"
33 #include "utilities/globalDefinitions.hpp"
34 #include "utilities/macros.hpp"
35
36 template <typename T, class OopClosureType>
37 void InstanceMirrorKlass::oop_oop_iterate_statics(oop obj, OopClosureType* closure) {
38 T* p = (T*)start_of_static_fields(obj);
39 T* const end = p + java_lang_Class::static_oop_field_count_raw(obj);
40
41 for (; p < end; ++p) {
42 Devirtualizer::do_oop(closure, p);
43 }
44 }
45
46 template <typename T, class OopClosureType>
47 void InstanceMirrorKlass::oop_oop_iterate(oop obj, OopClosureType* closure) {
48 InstanceKlass::oop_oop_iterate<T>(obj, closure);
49
50 if (Devirtualizer::do_metadata(closure)) {
51 Klass* klass = java_lang_Class::as_Klass_raw(obj);
52 // We'll get NULL for primitive mirrors.
53 if (klass != NULL) {
54 if (klass->is_instance_klass() && klass->class_loader_data()->is_shortlived()) {
55 // A weak hidden or an unsafe anonymous class doesn't have its own class loader,
56 // so when handling the java mirror for the class we need to make sure its class
57 // loader data is claimed, this is done by calling do_cld explicitly.
58 // For non-anonymous classes the call to do_cld is made when the class
59 // loader itself is handled.
60 Devirtualizer::do_cld(closure, klass->class_loader_data());
61 } else {
62 Devirtualizer::do_klass(closure, klass);
63 }
64 } else {
65 // We would like to assert here (as below) that if klass has been NULL, then
66 // this has been a mirror for a primitive type that we do not need to follow
67 // as they are always strong roots.
68 // However, we might get across a klass that just changed during CMS concurrent
69 // marking if allocation occurred in the old generation.
70 // This is benign here, as we keep alive all CLDs that were loaded during the
71 // CMS concurrent phase in the class loading, i.e. they will be iterated over
72 // and kept alive during remark.
73 // assert(java_lang_Class::is_primitive(obj), "Sanity check");
74 }
75 }
76
77 oop_oop_iterate_statics<T>(obj, closure);
78 }
79
80 template <typename T, class OopClosureType>
81 void InstanceMirrorKlass::oop_oop_iterate_reverse(oop obj, OopClosureType* closure) {
82 InstanceKlass::oop_oop_iterate_reverse<T>(obj, closure);
83
84 InstanceMirrorKlass::oop_oop_iterate_statics<T>(obj, closure);
85 }
86
87 template <typename T, class OopClosureType>
88 void InstanceMirrorKlass::oop_oop_iterate_statics_bounded(oop obj,
89 OopClosureType* closure,
90 MemRegion mr) {
91 T* p = (T*)start_of_static_fields(obj);
92 T* end = p + java_lang_Class::static_oop_field_count_raw(obj);
93
94 T* const l = (T*)mr.start();
95 T* const h = (T*)mr.end();
96 assert(mask_bits((intptr_t)l, sizeof(T)-1) == 0 &&
97 mask_bits((intptr_t)h, sizeof(T)-1) == 0,
98 "bounded region must be properly aligned");
99
100 if (p < l) {
101 p = l;
102 }
103 if (end > h) {
104 end = h;
105 }
106
107 for (;p < end; ++p) {
108 Devirtualizer::do_oop(closure, p);
109 }
110 }
111
112 template <typename T, class OopClosureType>
113 void InstanceMirrorKlass::oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr) {
114 InstanceKlass::oop_oop_iterate_bounded<T>(obj, closure, mr);
115
116 if (Devirtualizer::do_metadata(closure)) {
117 if (mr.contains(obj)) {
118 Klass* klass = java_lang_Class::as_Klass_raw(obj);
119 // We'll get NULL for primitive mirrors.
120 if (klass != NULL) {
121 Devirtualizer::do_klass(closure, klass);
122 }
123 }
124 }
125
126 oop_oop_iterate_statics_bounded<T>(obj, closure, mr);
127 }
128
129 #endif // SHARE_OOPS_INSTANCEMIRRORKLASS_INLINE_HPP