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
33 class ArchivedClassLoaderData {
34 Array<PackageEntry*>* _packages;
35 Array<ModuleEntry*>* _modules;
36
37 void assert_valid(ClassLoaderData* loader_data) {
38 // loader_data may be NULL if the boot layer has loaded no modules for the platform or
39 // system loaders (e.g., if you create a custom JDK image with only java.base).
40 if (loader_data != NULL) {
41 assert(!loader_data->has_class_mirror_holder(),
42 "loaders for non-strong hidden classes or unsafe anonymous classes not supported");
43 }
44 }
45 public:
46 ArchivedClassLoaderData() : _packages(NULL), _modules(NULL) {}
47
48 void allocate(ClassLoaderData* loader_data);
49 void init_archived_entries(ClassLoaderData* loader_data);
50 void init_archived_oops(ClassLoaderData* loader_data);
51
52 void serialize(SerializeClosure* f) {
53 f->do_ptr((void**)&_packages);
54 f->do_ptr((void**)&_modules);
55 }
56
57 void restore(ClassLoaderData* loader_data, bool do_entries, bool do_oops);
58 };
59
60 static ArchivedClassLoaderData _archived_boot_loader_data;
61 static ArchivedClassLoaderData _archived_platform_loader_data;
62 static ArchivedClassLoaderData _archived_system_loader_data;
63 static ModuleEntry* _archived_javabase_moduleEntry = NULL;
64
65 void ArchivedClassLoaderData::allocate(ClassLoaderData* loader_data) {
66 assert(DumpSharedSpaces, "must be");
67 assert_valid(loader_data);
68 if (loader_data != NULL) {
69 // We can't create a hashtable at dump time because the hashcode dependes on the
70 // address of the Symbols, which may be relocated at run time due to ASLR.
71 _packages = loader_data->packages()->allocate_archived_entries();
72 _modules = loader_data->modules() ->allocate_archived_entries();
73 }
74 }
75
76 void ArchivedClassLoaderData::init_archived_entries(ClassLoaderData* loader_data) {
77 assert(DumpSharedSpaces, "must be");
78 assert_valid(loader_data);
79 if (loader_data != NULL) {
80 loader_data->packages()->init_archived_entries(_packages);
81 loader_data->modules() ->init_archived_entries(_modules);
82 }
83 }
84
85 void ArchivedClassLoaderData::init_archived_oops(ClassLoaderData* loader_data) {
86 assert(DumpSharedSpaces, "must be");
87 assert_valid(loader_data);
88 if (loader_data != NULL) {
89 loader_data->modules()->init_archived_oops(_modules);
90 }
91 }
92
93 void ArchivedClassLoaderData::restore(ClassLoaderData* loader_data, bool do_entries, bool do_oops) {
94 assert(UseSharedSpaces, "must be");
95 assert_valid(loader_data);
96 if (_modules != NULL) { // Could be NULL if we have archived no modules for platform/system loaders
97 ModuleEntryTable* modules = loader_data->modules();
98 PackageEntryTable* packages = loader_data->packages();
99
100 MutexLocker m1(Module_lock);
101 if (do_entries) {
102 modules->load_archived_entries(loader_data, _modules);
103 packages->load_archived_entries(_packages);
104 }
105 if (do_oops) {
106 modules->restore_archived_oops(loader_data, _modules);
107 }
108 }
109 }
110
111 // ------------------------------
112
113 ClassLoaderData* ClassLoaderDataShared::null_class_loader_data() {
114 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
115 assert(loader_data != NULL, "must be");
116 return loader_data;
117 }
118
119 ClassLoaderData* ClassLoaderDataShared::java_platform_loader_data_or_null() {
120 return ClassLoaderData::class_loader_data_or_null(SystemDictionary::java_platform_loader());
121 }
122
123 ClassLoaderData* ClassLoaderDataShared::java_system_loader_data_or_null() {
124 return ClassLoaderData::class_loader_data_or_null(SystemDictionary::java_system_loader());
125 }
126
127 void ClassLoaderDataShared::allocate_archived_tables() {
128 assert(DumpSharedSpaces, "must be");
129 if (MetaspaceShared::use_full_module_graph()) {
130 _archived_boot_loader_data.allocate (null_class_loader_data());
131 _archived_platform_loader_data.allocate(java_platform_loader_data_or_null());
132 _archived_system_loader_data.allocate (java_system_loader_data_or_null());
133 }
134 }
135
136 void ClassLoaderDataShared::init_archived_tables() {
137 assert(DumpSharedSpaces, "must be");
138 if (MetaspaceShared::use_full_module_graph()) {
139 _archived_boot_loader_data.init_archived_entries (null_class_loader_data());
140 _archived_platform_loader_data.init_archived_entries(java_platform_loader_data_or_null());
141 _archived_system_loader_data.init_archived_entries (java_system_loader_data_or_null());
142 _archived_javabase_moduleEntry = ModuleEntry::get_archived_entry(ModuleEntryTable::javabase_moduleEntry());
143 }
144 }
145
146 void ClassLoaderDataShared::init_archived_oops() {
147 assert(DumpSharedSpaces, "must be");
148 if (MetaspaceShared::use_full_module_graph()) {
149 _archived_boot_loader_data.init_archived_oops (null_class_loader_data());
150 _archived_platform_loader_data.init_archived_oops(java_platform_loader_data_or_null());
151 _archived_system_loader_data.init_archived_oops (java_system_loader_data_or_null());
152 }
153 }
154
155 void ClassLoaderDataShared::serialize(class SerializeClosure* f) {
156 _archived_boot_loader_data.serialize(f);
157 _archived_platform_loader_data.serialize(f);
158 _archived_system_loader_data.serialize(f);
159 f->do_ptr((void**)&_archived_javabase_moduleEntry);
160
161 if (f->reading() && MetaspaceShared::use_full_module_graph()) {
162 // Must be done before ClassLoader::create_javabase()
163 _archived_boot_loader_data.restore(null_class_loader_data(), true, false);
164 ModuleEntryTable::set_javabase_moduleEntry(_archived_javabase_moduleEntry);
165 log_info(cds)("use_full_module_graph = true; java.base = " INTPTR_FORMAT,
166 p2i(_archived_javabase_moduleEntry));
167 }
168 }
169
170 void ClassLoaderDataShared::restore_archived_oops_for_null_class_loader_data() {
171 assert(UseSharedSpaces, "must be");
172 if (MetaspaceShared::use_full_module_graph()) {
173 _archived_boot_loader_data.restore(null_class_loader_data(), false, true);
174 }
175 }
176
177 void ClassLoaderDataShared::restore_java_platform_loader_from_archive(ClassLoaderData* loader_data) {
178 assert(UseSharedSpaces, "must be");
179 assert(MetaspaceShared::use_full_module_graph(), "must be");
180 _archived_platform_loader_data.restore(loader_data, true, true);
181 }
182
183 void ClassLoaderDataShared::restore_java_system_loader_from_archive(ClassLoaderData* loader_data) {
184 assert(UseSharedSpaces, "must be");
185 assert(MetaspaceShared::use_full_module_graph(), "must be");
186 _archived_system_loader_data.restore(loader_data, true, true);
187 }