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 allocate(ClassLoaderData* loader_data);
52 void init_archived_entries(ClassLoaderData* loader_data);
53 void init_archived_oops(ClassLoaderData* loader_data);
54
55 void serialize(SerializeClosure* f) {
56 f->do_ptr((void**)&_packages);
57 f->do_ptr((void**)&_modules);
58 }
59
60 void restore(ClassLoaderData* loader_data, bool do_entries, bool do_oops);
61 };
62
63 static ArchivedClassLoaderData _archived_boot_loader_data;
64 static ArchivedClassLoaderData _archived_platform_loader_data;
65 static ArchivedClassLoaderData _archived_system_loader_data;
66 static ModuleEntry* _archived_javabase_moduleEntry = NULL;
67
68 void ArchivedClassLoaderData::allocate(ClassLoaderData* loader_data) {
69 assert(DumpSharedSpaces, "must be");
70 assert_valid(loader_data);
71 if (loader_data != NULL) {
72 // We can't create a hashtable at dump time because the hashcode dependes on the
73 // address of the Symbols, which may be relocated at run time due to ASLR.
74 _packages = loader_data->packages()->allocate_archived_entries();
75 _modules = loader_data->modules() ->allocate_archived_entries();
76 }
77 }
78
79 void ArchivedClassLoaderData::init_archived_entries(ClassLoaderData* loader_data) {
80 assert(DumpSharedSpaces, "must be");
81 assert_valid(loader_data);
82 if (loader_data != NULL) {
83 loader_data->packages()->init_archived_entries(_packages);
84 loader_data->modules() ->init_archived_entries(_modules);
85 }
86 }
87
88 void ArchivedClassLoaderData::init_archived_oops(ClassLoaderData* loader_data) {
89 assert(DumpSharedSpaces, "must be");
90 assert_valid(loader_data);
91 if (loader_data != NULL) {
92 loader_data->modules()->init_archived_oops(_modules);
93 }
94 }
95
96 void ArchivedClassLoaderData::restore(ClassLoaderData* loader_data, bool do_entries, bool do_oops) {
97 assert(UseSharedSpaces, "must be");
98 assert_valid(loader_data);
99 if (_modules != NULL) { // Could be NULL if we have archived no modules for platform/system loaders
100 ModuleEntryTable* modules = loader_data->modules();
101 PackageEntryTable* packages = loader_data->packages();
102
103 MutexLocker m1(Module_lock);
104 if (do_entries) {
105 modules->load_archived_entries(loader_data, _modules);
106 packages->load_archived_entries(_packages);
107 }
108 if (do_oops) {
109 modules->restore_archived_oops(loader_data, _modules);
110 }
111 }
112 }
113
114 // ------------------------------
115
116 ClassLoaderData* ClassLoaderDataShared::null_class_loader_data() {
117 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
118 assert(loader_data != NULL, "must be");
119 return loader_data;
120 }
121
122 ClassLoaderData* ClassLoaderDataShared::java_platform_loader_data_or_null() {
123 return ClassLoaderData::class_loader_data_or_null(SystemDictionary::java_platform_loader());
124 }
125
126 ClassLoaderData* ClassLoaderDataShared::java_system_loader_data_or_null() {
127 return ClassLoaderData::class_loader_data_or_null(SystemDictionary::java_system_loader());
128 }
129
130 void ClassLoaderDataShared::allocate_archived_tables() {
131 assert(DumpSharedSpaces && MetaspaceShared::use_full_module_graph(), "must be");
132 _archived_boot_loader_data.allocate (null_class_loader_data());
133 _archived_platform_loader_data.allocate(java_platform_loader_data_or_null());
134 _archived_system_loader_data.allocate (java_system_loader_data_or_null());
135 }
136
137 void ClassLoaderDataShared::init_archived_tables() {
138 assert(DumpSharedSpaces && MetaspaceShared::use_full_module_graph(), "must be");
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 void ClassLoaderDataShared::init_archived_oops() {
146 assert(DumpSharedSpaces && MetaspaceShared::use_full_module_graph(), "must be");
147 _archived_boot_loader_data.init_archived_oops (null_class_loader_data());
148 _archived_platform_loader_data.init_archived_oops(java_platform_loader_data_or_null());
149 _archived_system_loader_data.init_archived_oops (java_system_loader_data_or_null());
150 }
151
152 void ClassLoaderDataShared::serialize(class SerializeClosure* f) {
153 _archived_boot_loader_data.serialize(f);
154 _archived_platform_loader_data.serialize(f);
155 _archived_system_loader_data.serialize(f);
156 f->do_ptr((void**)&_archived_javabase_moduleEntry);
157
158 if (f->reading() && MetaspaceShared::use_full_module_graph()) {
159 // Must be done before ClassLoader::create_javabase()
160 _archived_boot_loader_data.restore(null_class_loader_data(), true, false);
161 ModuleEntryTable::set_javabase_moduleEntry(_archived_javabase_moduleEntry);
162 log_info(cds)("use_full_module_graph = true; java.base = " INTPTR_FORMAT,
163 p2i(_archived_javabase_moduleEntry));
164 }
165 }
166
167 oop ClassLoaderDataShared::restore_archived_oops_for_null_class_loader_data() {
168 assert(UseSharedSpaces && MetaspaceShared::use_full_module_graph(), "must be");
169 _archived_boot_loader_data.restore(null_class_loader_data(), false, true);
170 return _archived_javabase_moduleEntry->module();
171 }
172
173 void ClassLoaderDataShared::restore_java_platform_loader_from_archive(ClassLoaderData* loader_data) {
174 assert(UseSharedSpaces && MetaspaceShared::use_full_module_graph(), "must be");
175 _archived_platform_loader_data.restore(loader_data, true, true);
176 }
177
178 void ClassLoaderDataShared::restore_java_system_loader_from_archive(ClassLoaderData* loader_data) {
179 assert(UseSharedSpaces && MetaspaceShared::use_full_module_graph(), "must be");
180 _archived_system_loader_data.restore(loader_data, true, true);
181 }
182
183 #endif // INCLUDE_CDS_JAVA_HEAP