1 /*
2 * Copyright (c) 2015, 2023, 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_OOPS_INSTANCEKLASS_INLINE_HPP
26 #define SHARE_OOPS_INSTANCEKLASS_INLINE_HPP
27
28 #include "oops/instanceKlass.hpp"
29
30 #include "memory/memRegion.hpp"
31 #include "oops/fieldInfo.inline.hpp"
32 #include "oops/klass.inline.hpp"
33 #include "oops/oop.inline.hpp"
34 #include "runtime/atomic.hpp"
35 #include "utilities/devirtualizer.inline.hpp"
36 #include "utilities/globalDefinitions.hpp"
37
38 inline intptr_t* InstanceKlass::start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
39 inline intptr_t* InstanceKlass::end_of_itable() const { return start_of_itable() + itable_length(); }
40
41 inline oop InstanceKlass::static_field_base_raw() { return java_mirror(); }
42
43 inline Symbol* InstanceKlass::field_name(int index) const { return field(index).name(constants()); }
44 inline Symbol* InstanceKlass::field_signature(int index) const { return field(index).signature(constants()); }
45
46 inline int InstanceKlass::java_fields_count() const { return FieldInfoStream::num_java_fields(fieldinfo_stream()); }
47 inline int InstanceKlass::total_fields_count() const { return FieldInfoStream::num_total_fields(fieldinfo_stream()); }
48
49 inline OopMapBlock* InstanceKlass::start_of_nonstatic_oop_maps() const {
50 return (OopMapBlock*)(start_of_itable() + itable_length());
51 }
52
53 inline Klass** InstanceKlass::end_of_nonstatic_oop_maps() const {
54 return (Klass**)(start_of_nonstatic_oop_maps() +
55 nonstatic_oop_map_count());
56 }
57
58 inline InstanceKlass* volatile* InstanceKlass::adr_implementor() const {
59 if (is_interface()) {
60 return (InstanceKlass* volatile*)end_of_nonstatic_oop_maps();
61 } else {
62 return nullptr;
63 }
64 }
65
66 inline ObjArrayKlass* InstanceKlass::array_klasses_acquire() const {
67 return Atomic::load_acquire(&_array_klasses);
68 }
69
70 inline void InstanceKlass::release_set_array_klasses(ObjArrayKlass* k) {
71 Atomic::release_store(&_array_klasses, k);
72 }
73
74 inline jmethodID* InstanceKlass::methods_jmethod_ids_acquire() const {
75 return Atomic::load_acquire(&_methods_jmethod_ids);
76 }
77
78 inline void InstanceKlass::release_set_methods_jmethod_ids(jmethodID* jmeths) {
79 Atomic::release_store(&_methods_jmethod_ids, jmeths);
80 }
81
82 // The iteration over the oops in objects is a hot path in the GC code.
83 // By force inlining the following functions, we get similar GC performance
84 // as the previous macro based implementation.
85
86 template <typename T, class OopClosureType>
87 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure) {
88 T* p = obj->field_addr<T>(map->offset());
89 T* const end = p + map->count();
90
91 for (; p < end; ++p) {
92 Devirtualizer::do_oop(closure, p);
93 }
94 }
95
96 template <typename T, class OopClosureType>
97 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure) {
98 T* const start = obj->field_addr<T>(map->offset());
99 T* p = start + map->count();
100
101 while (start < p) {
102 --p;
103 Devirtualizer::do_oop(closure, p);
104 }
105 }
106
107 template <typename T, class OopClosureType>
108 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr) {
109 T* p = obj->field_addr<T>(map->offset());
110 T* end = p + map->count();
111
112 T* const l = (T*)mr.start();
113 T* const h = (T*)mr.end();
114 assert(mask_bits((intptr_t)l, sizeof(T)-1) == 0 &&
115 mask_bits((intptr_t)h, sizeof(T)-1) == 0,
116 "bounded region must be properly aligned");
117
118 if (p < l) {
119 p = l;
120 }
121 if (end > h) {
122 end = h;
123 }
124
125 for (;p < end; ++p) {
126 Devirtualizer::do_oop(closure, p);
127 }
128 }
129
130 template <typename T, class OopClosureType>
131 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure) {
132 OopMapBlock* map = start_of_nonstatic_oop_maps();
133 OopMapBlock* const end_map = map + nonstatic_oop_map_count();
134
135 for (; map < end_map; ++map) {
136 oop_oop_iterate_oop_map<T>(map, obj, closure);
137 }
138 }
139
140 template <typename T, class OopClosureType>
141 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure) {
142 OopMapBlock* const start_map = start_of_nonstatic_oop_maps();
143 OopMapBlock* map = start_map + nonstatic_oop_map_count();
144
145 while (start_map < map) {
146 --map;
147 oop_oop_iterate_oop_map_reverse<T>(map, obj, closure);
148 }
149 }
150
151 template <typename T, class OopClosureType>
152 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr) {
153 OopMapBlock* map = start_of_nonstatic_oop_maps();
154 OopMapBlock* const end_map = map + nonstatic_oop_map_count();
155
156 for (;map < end_map; ++map) {
157 oop_oop_iterate_oop_map_bounded<T>(map, obj, closure, mr);
158 }
159 }
160
161 template <typename T, class OopClosureType>
162 ALWAYSINLINE void InstanceKlass::oop_oop_iterate(oop obj, OopClosureType* closure) {
163 if (Devirtualizer::do_metadata(closure)) {
164 Devirtualizer::do_klass(closure, this);
165 }
166
167 oop_oop_iterate_oop_maps<T>(obj, closure);
168 }
169
170 template <typename T, class OopClosureType>
171 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_reverse(oop obj, OopClosureType* closure) {
172 assert(!Devirtualizer::do_metadata(closure),
173 "Code to handle metadata is not implemented");
174
175 oop_oop_iterate_oop_maps_reverse<T>(obj, closure);
176 }
177
178 template <typename T, class OopClosureType>
179 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr) {
180 if (Devirtualizer::do_metadata(closure)) {
181 if (mr.contains(obj)) {
182 Devirtualizer::do_klass(closure, this);
183 }
184 }
185
186 oop_oop_iterate_oop_maps_bounded<T>(obj, closure, mr);
187 }
188
189 #endif // SHARE_OOPS_INSTANCEKLASS_INLINE_HPP