1 /*
2 * Copyright (c) 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.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/classLoaderData.inline.hpp"
27 #include "classfile/classLoaderDataShared.hpp"
28 #include "classfile/moduleEntry.hpp"
29 #include "classfile/packageEntry.hpp"
30 #include "logging/log.hpp"
31 #include "memory/metaspaceShared.hpp"
32 #include "runtime/handles.inline.hpp"
33
34 #if INCLUDE_CDS_JAVA_HEAP
35
36 class ArchivedClassLoaderData {
37 Array<PackageEntry*>* _packages;
38 Array<ModuleEntry*>* _modules;
39
40 void assert_valid(ClassLoaderData* loader_data) {
41 // loader_data may be NULL if the boot layer has loaded no modules for the platform or
42 // system loaders (e.g., if you create a custom JDK image with only java.base).
43 if (loader_data != NULL) {
44 assert(!loader_data->has_class_mirror_holder(),
45 "loaders for non-strong hidden classes or unsafe anonymous classes not supported");
46 }
47 }
48 public:
49 ArchivedClassLoaderData() : _packages(NULL), _modules(NULL) {}
50
51 void iterate_symbols(ClassLoaderData* loader_data, MetaspaceClosure* closure);
52 void allocate(ClassLoaderData* loader_data);
53 void init_archived_entries(ClassLoaderData* loader_data);
54 void init_archived_oops(ClassLoaderData* loader_data);
55
56 void serialize(SerializeClosure* f) {
57 f->do_ptr((void**)&_packages);
58 f->do_ptr((void**)&_modules);
59 }
60
61 void restore(ClassLoaderData* loader_data, bool do_entries, bool do_oops);
62 void clear_archived_oops();
63 };
64
65 static ArchivedClassLoaderData _archived_boot_loader_data;
66 static ArchivedClassLoaderData _archived_platform_loader_data;
67 static ArchivedClassLoaderData _archived_system_loader_data;
68 static ModuleEntry* _archived_javabase_moduleEntry = NULL;
69
70 void ArchivedClassLoaderData::iterate_symbols(ClassLoaderData* loader_data, MetaspaceClosure* closure) {
71 assert(DumpSharedSpaces, "must be");
72 assert_valid(loader_data);
73 if (loader_data != NULL) {
74 loader_data->packages()->iterate_symbols(closure);
75 loader_data->modules() ->iterate_symbols(closure);
76 }
77 }
78
79 void ArchivedClassLoaderData::allocate(ClassLoaderData* loader_data) {
80 assert(DumpSharedSpaces, "must be");
81 assert_valid(loader_data);
82 if (loader_data != NULL) {
83 // We can't create hashtables at dump time because the hashcode depends on the
84 // address of the Symbols, which may be relocated at runtime due to ASLR.
85 // So we store the packages/modules in Arrays. At runtime, we create
86 // the hashtables using these arrays.
87 _packages = loader_data->packages()->allocate_archived_entries();
88 _modules = loader_data->modules() ->allocate_archived_entries();
89 }
90 }
91
92 void ArchivedClassLoaderData::init_archived_entries(ClassLoaderData* loader_data) {
93 assert(DumpSharedSpaces, "must be");
94 assert_valid(loader_data);
95 if (loader_data != NULL) {
96 loader_data->packages()->init_archived_entries(_packages);
97 loader_data->modules() ->init_archived_entries(_modules);
98 }
99 }
100
101 void ArchivedClassLoaderData::init_archived_oops(ClassLoaderData* loader_data) {
102 assert(DumpSharedSpaces, "must be");
103 assert_valid(loader_data);
104 if (loader_data != NULL) {
105 loader_data->modules()->init_archived_oops(_modules);
106 }
107 }
108
109 void ArchivedClassLoaderData::restore(ClassLoaderData* loader_data, bool do_entries, bool do_oops) {
110 assert(UseSharedSpaces, "must be");
111 assert_valid(loader_data);
112 if (_modules != NULL) { // Could be NULL if we have archived no modules for platform/system loaders
113 ModuleEntryTable* modules = loader_data->modules();
114 PackageEntryTable* packages = loader_data->packages();
115
116 MutexLocker m1(Module_lock);
117 if (do_entries) {
118 modules->load_archived_entries(loader_data, _modules);
119 packages->load_archived_entries(_packages);
120 }
121 if (do_oops) {
122 modules->restore_archived_oops(loader_data, _modules);
123 }
124 }
125 }
126
127 void ArchivedClassLoaderData::clear_archived_oops() {
128 assert(UseSharedSpaces, "must be");
129 if (_modules != NULL) {
130 for (int i = 0; i < _modules->length(); i++) {
131 _modules->at(i)->clear_archived_oops();
132 }
133 }
134 }
135
136 // ------------------------------
137
138 static ClassLoaderData* null_class_loader_data() {
139 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
140 assert(loader_data != NULL, "must be");
141 return loader_data;
142 }
143
144 static ClassLoaderData* java_platform_loader_data_or_null() {
145 return ClassLoaderData::class_loader_data_or_null(SystemDictionary::java_platform_loader());
146 }
147
148 static ClassLoaderData* java_system_loader_data_or_null() {
149 return ClassLoaderData::class_loader_data_or_null(SystemDictionary::java_system_loader());
150 }
151
152 void ClassLoaderDataShared::iterate_symbols(MetaspaceClosure* closure) {
153 assert(DumpSharedSpaces && MetaspaceShared::use_full_module_graph(), "must be");
154 _archived_boot_loader_data.iterate_symbols (null_class_loader_data(), closure);
155 _archived_platform_loader_data.iterate_symbols(java_platform_loader_data_or_null(), closure);
156 _archived_system_loader_data.iterate_symbols (java_system_loader_data_or_null(), closure);
157 }
158
159 void ClassLoaderDataShared::allocate_archived_tables() {
160 assert(DumpSharedSpaces && MetaspaceShared::use_full_module_graph(), "must be");
161 _archived_boot_loader_data.allocate (null_class_loader_data());
162 _archived_platform_loader_data.allocate(java_platform_loader_data_or_null());
163 _archived_system_loader_data.allocate (java_system_loader_data_or_null());
164 }
165
166 void ClassLoaderDataShared::init_archived_tables() {
167 assert(DumpSharedSpaces && MetaspaceShared::use_full_module_graph(), "must be");
168 _archived_boot_loader_data.init_archived_entries (null_class_loader_data());
169 _archived_platform_loader_data.init_archived_entries(java_platform_loader_data_or_null());
170 _archived_system_loader_data.init_archived_entries (java_system_loader_data_or_null());
171 _archived_javabase_moduleEntry = ModuleEntry::get_archived_entry(ModuleEntryTable::javabase_moduleEntry());
172 }
173
174 void ClassLoaderDataShared::init_archived_oops() {
175 assert(DumpSharedSpaces && MetaspaceShared::use_full_module_graph(), "must be");
176 _archived_boot_loader_data.init_archived_oops (null_class_loader_data());
177 _archived_platform_loader_data.init_archived_oops(java_platform_loader_data_or_null());
178 _archived_system_loader_data.init_archived_oops (java_system_loader_data_or_null());
179 }
180
181 void ClassLoaderDataShared::serialize(SerializeClosure* f) {
182 _archived_boot_loader_data.serialize(f);
183 _archived_platform_loader_data.serialize(f);
184 _archived_system_loader_data.serialize(f);
185 f->do_ptr((void**)&_archived_javabase_moduleEntry);
186
187 if (f->reading() && MetaspaceShared::use_full_module_graph()) {
188 // Must be done before ClassLoader::create_javabase()
189 _archived_boot_loader_data.restore(null_class_loader_data(), true, false);
190 ModuleEntryTable::set_javabase_moduleEntry(_archived_javabase_moduleEntry);
191 log_info(cds)("use_full_module_graph = true; java.base = " INTPTR_FORMAT,
192 p2i(_archived_javabase_moduleEntry));
193 }
194 }
195
196 void ClassLoaderDataShared::clear_archived_oops() {
197 assert(UseSharedSpaces && !MetaspaceShared::use_full_module_graph(), "must be");
198 _archived_boot_loader_data.clear_archived_oops();
199 _archived_platform_loader_data.clear_archived_oops();
200 _archived_system_loader_data.clear_archived_oops();
201 }
202
203 oop ClassLoaderDataShared::restore_archived_oops_for_null_class_loader_data() {
204 assert(UseSharedSpaces && MetaspaceShared::use_full_module_graph(), "must be");
205 _archived_boot_loader_data.restore(null_class_loader_data(), false, true);
206 return _archived_javabase_moduleEntry->module();
207 }
208
209 void ClassLoaderDataShared::restore_java_platform_loader_from_archive(ClassLoaderData* loader_data) {
210 assert(UseSharedSpaces && MetaspaceShared::use_full_module_graph(), "must be");
211 _archived_platform_loader_data.restore(loader_data, true, true);
212 }
213
214 void ClassLoaderDataShared::restore_java_system_loader_from_archive(ClassLoaderData* loader_data) {
215 assert(UseSharedSpaces && MetaspaceShared::use_full_module_graph(), "must be");
216 _archived_system_loader_data.restore(loader_data, true, true);
217 }
218
219 #endif // INCLUDE_CDS_JAVA_HEAP