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 InlineKlass* InstanceKlass::get_inline_type_field_klass(int idx) const {
67 assert(has_inline_type_fields(), "Sanity checking");
68 assert(idx < java_fields_count(), "IOOB");
69 InlineKlass* k = inline_type_field_klasses_array()->at(idx);
70 assert(k != nullptr, "Should always be set before being read");
71 return k;
72 }
73
74 inline InlineKlass* InstanceKlass::get_inline_type_field_klass_or_null(int idx) const {
75 assert(has_inline_type_fields(), "Sanity checking");
76 assert(idx < java_fields_count(), "IOOB");
77 InlineKlass* k = inline_type_field_klasses_array()->at(idx);
78 return k;
79 }
80
81 inline void InstanceKlass::set_inline_type_field_klass(int idx, InlineKlass* k) {
82 assert(has_inline_type_fields(), "Sanity checking");
83 assert(idx < java_fields_count(), "IOOB");
84 assert(k != nullptr, "Should not be set to nullptr");
85 assert(inline_type_field_klasses_array() != nullptr, "array must have been created");
86 assert(inline_type_field_klasses_array()->at(idx) == nullptr, "Should not be set twice");
87 inline_type_field_klasses_array()->at_put(idx, k);
88 }
89
90 inline void InstanceKlass::reset_inline_type_field_klass(int idx) {
91 assert(has_inline_type_fields(), "Sanity checking");
92 assert(idx < java_fields_count(), "IOOB");
93 inline_type_field_klasses_array()->at_put(idx, nullptr);
94 }
95
96
97 inline ArrayKlass* InstanceKlass::array_klasses_acquire() const {
98 return Atomic::load_acquire(&_array_klasses);
99 }
100
101 inline void InstanceKlass::release_set_array_klasses(ArrayKlass* k) {
102 Atomic::release_store(&_array_klasses, k);
103 }
104
105 inline jmethodID* InstanceKlass::methods_jmethod_ids_acquire() const {
106 return Atomic::load_acquire(&_methods_jmethod_ids);
107 }
108
109 inline void InstanceKlass::release_set_methods_jmethod_ids(jmethodID* jmeths) {
110 Atomic::release_store(&_methods_jmethod_ids, jmeths);
111 }
112
113 // The iteration over the oops in objects is a hot path in the GC code.
114 // By force inlining the following functions, we get similar GC performance
115 // as the previous macro based implementation.
116
117 template <typename T, class OopClosureType>
118 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure) {
119 T* p = obj->field_addr<T>(map->offset());
120 T* const end = p + map->count();
121
122 for (; p < end; ++p) {
123 Devirtualizer::do_oop(closure, p);
124 }
125 }
126
127 template <typename T, class OopClosureType>
128 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure) {
129 T* const start = obj->field_addr<T>(map->offset());
130 T* p = start + map->count();
131
132 while (start < p) {
133 --p;
134 Devirtualizer::do_oop(closure, p);
135 }
136 }
137
138 template <typename T, class OopClosureType>
139 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr) {
140 T* p = obj->field_addr<T>(map->offset());
141 T* end = p + map->count();
142
143 T* const l = (T*)mr.start();
144 T* const h = (T*)mr.end();
145 assert(mask_bits((intptr_t)l, sizeof(T)-1) == 0 &&
146 mask_bits((intptr_t)h, sizeof(T)-1) == 0,
147 "bounded region must be properly aligned");
148
149 if (p < l) {
150 p = l;
151 }
152 if (end > h) {
153 end = h;
154 }
155
156 for (;p < end; ++p) {
157 Devirtualizer::do_oop(closure, p);
158 }
159 }
160
161 template <typename T, class OopClosureType>
162 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure) {
163 OopMapBlock* map = start_of_nonstatic_oop_maps();
164 OopMapBlock* const end_map = map + nonstatic_oop_map_count();
165
166 for (; map < end_map; ++map) {
167 oop_oop_iterate_oop_map<T>(map, obj, closure);
168 }
169 }
170
171 template <typename T, class OopClosureType>
172 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure) {
173 OopMapBlock* const start_map = start_of_nonstatic_oop_maps();
174 OopMapBlock* map = start_map + nonstatic_oop_map_count();
175
176 while (start_map < map) {
177 --map;
178 oop_oop_iterate_oop_map_reverse<T>(map, obj, closure);
179 }
180 }
181
182 template <typename T, class OopClosureType>
183 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr) {
184 OopMapBlock* map = start_of_nonstatic_oop_maps();
185 OopMapBlock* const end_map = map + nonstatic_oop_map_count();
186
187 for (;map < end_map; ++map) {
188 oop_oop_iterate_oop_map_bounded<T>(map, obj, closure, mr);
189 }
190 }
191
192 template <typename T, class OopClosureType>
193 ALWAYSINLINE void InstanceKlass::oop_oop_iterate(oop obj, OopClosureType* closure) {
194 if (Devirtualizer::do_metadata(closure)) {
195 Devirtualizer::do_klass(closure, this);
196 }
197
198 oop_oop_iterate_oop_maps<T>(obj, closure);
199 }
200
201 template <typename T, class OopClosureType>
202 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_reverse(oop obj, OopClosureType* closure) {
203 assert(!Devirtualizer::do_metadata(closure),
204 "Code to handle metadata is not implemented");
205
206 oop_oop_iterate_oop_maps_reverse<T>(obj, closure);
207 }
208
209 template <typename T, class OopClosureType>
210 ALWAYSINLINE void InstanceKlass::oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr) {
211 if (Devirtualizer::do_metadata(closure)) {
212 if (mr.contains(obj)) {
213 Devirtualizer::do_klass(closure, this);
214 }
215 }
216
217 oop_oop_iterate_oop_maps_bounded<T>(obj, closure, mr);
218 }
219
220 #endif // SHARE_OOPS_INSTANCEKLASS_INLINE_HPP