1 /*
2 * Copyright (c) 2015, 2025, 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 "cds/aotClassLocation.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/dynamicArchive.hpp"
29 #include "cds/filemap.hpp"
30 #include "cds/heapShared.hpp"
31 #include "classfile/classFileParser.hpp"
32 #include "classfile/classLoader.inline.hpp"
33 #include "classfile/classLoaderExt.hpp"
34 #include "classfile/classLoaderData.inline.hpp"
35 #include "classfile/classLoadInfo.hpp"
36 #include "classfile/klassFactory.hpp"
37 #include "classfile/modules.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "gc/shared/collectedHeap.hpp"
41 #include "logging/log.hpp"
42 #include "memory/allocation.inline.hpp"
43 #include "memory/resourceArea.hpp"
44 #include "oops/instanceKlass.hpp"
45 #include "oops/klass.inline.hpp"
46 #include "oops/oop.inline.hpp"
47 #include "oops/symbol.hpp"
48 #include "runtime/arguments.hpp"
49 #include "runtime/handles.inline.hpp"
50 #include "runtime/java.hpp"
51 #include "runtime/os.hpp"
52 #include "utilities/checkedCast.hpp"
53 #include "utilities/stringUtils.hpp"
54
55 void ClassLoaderExt::append_boot_classpath(ClassPathEntry* new_entry) {
56 if (CDSConfig::is_using_archive()) {
57 warning("Sharing is only supported for boot loader classes because bootstrap classpath has been appended");
58 FileMapInfo::current_info()->set_has_platform_or_app_classes(false);
59 if (DynamicArchive::is_mapped()) {
60 FileMapInfo::dynamic_info()->set_has_platform_or_app_classes(false);
61 }
62 }
63 ClassLoader::add_to_boot_append_entries(new_entry);
64 }
65
66 int ClassLoaderExt::compare_module_names(const char** p1, const char** p2) {
67 return strcmp(*p1, *p2);
68 }
69
70 void ClassLoaderExt::record_result(const s2 classpath_index, InstanceKlass* result, bool redefined) {
71 assert(CDSConfig::is_dumping_archive(), "sanity");
72
73 // We need to remember where the class comes from during dumping.
74 oop loader = result->class_loader();
75 s2 classloader_type = ClassLoader::BOOT_LOADER;
76 if (SystemDictionary::is_system_class_loader(loader)) {
77 classloader_type = ClassLoader::APP_LOADER;
78 AOTClassLocationConfig::dumptime_set_has_app_classes();
79 } else if (SystemDictionary::is_platform_class_loader(loader)) {
80 classloader_type = ClassLoader::PLATFORM_LOADER;
81 AOTClassLocationConfig::dumptime_set_has_platform_classes();
82 }
83 AOTClassLocationConfig::dumptime_update_max_used_index(classpath_index);
84 result->set_shared_classpath_index(classpath_index);
85 result->set_shared_class_loader_type(classloader_type);
86 #if INCLUDE_CDS_JAVA_HEAP
87 if (CDSConfig::is_dumping_heap() && AllowArchivingWithJavaAgent && classloader_type == ClassLoader::BOOT_LOADER &&
88 classpath_index < 0 && redefined) {
89 // When dumping the heap (which happens only during static dump), classes for the built-in
90 // loaders are always loaded from known locations (jimage, classpath or modulepath),
91 // so classpath_index should always be >= 0.
92 // The only exception is when a java agent is used during dump time (for testing
93 // purposes only). If a class is transformed by the agent, the AOTClassLocation of
94 // this class may point to an unknown location. This may break heap object archiving,
95 // which requires all the boot classes to be from known locations. This is an
96 // uncommon scenario (even in test cases). Let's simply disable heap object archiving.
97 ResourceMark rm;
98 log_warning(cds)("CDS heap objects cannot be written because class %s maybe modified by ClassFileLoadHook.",
99 result->external_name());
100 CDSConfig::disable_heap_dumping();
101 }
102 #endif // INCLUDE_CDS_JAVA_HEAP
103 }