1 /*
2 * Copyright (c) 2021, 2024, 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 "cds/cds_globals.hpp"
27 #include "cds/classListWriter.hpp"
28 #include "cds/lambdaFormInvokers.inline.hpp"
29 #include "classfile/classFileStream.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/classLoaderData.hpp"
32 #include "classfile/classLoaderDataGraph.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/systemDictionaryShared.hpp"
35 #include "memory/resourceArea.hpp"
36 #include "oops/constantPool.inline.hpp"
37 #include "oops/instanceKlass.hpp"
38 #include "runtime/mutexLocker.hpp"
39
40 fileStream* ClassListWriter::_classlist_file = nullptr;
41
42 void ClassListWriter::init() {
43 // For -XX:DumpLoadedClassList=<file> option
44 if (DumpLoadedClassList != nullptr) {
45 const char* list_name = make_log_name(DumpLoadedClassList, nullptr);
46 _classlist_file = new(mtInternal)
47 fileStream(list_name);
48 _classlist_file->print_cr("# NOTE: Do not modify this file.");
49 _classlist_file->print_cr("#");
50 _classlist_file->print_cr("# This file is generated via the -XX:DumpLoadedClassList=<class_list_file> option");
51 _classlist_file->print_cr("# and is used at CDS archive dump time (see -Xshare:dump).");
52 _classlist_file->print_cr("#");
53 FREE_C_HEAP_ARRAY(char, list_name);
54 }
55 }
56
57 void ClassListWriter::write(const InstanceKlass* k, const ClassFileStream* cfs) {
58 assert(is_enabled(), "must be");
59
60 if (!ClassLoader::has_jrt_entry()) {
61 log_warning(cds)("DumpLoadedClassList and CDS are not supported in exploded build");
62 DumpLoadedClassList = nullptr;
63 return;
64 }
65
66 ClassListWriter w;
67 write_to_stream(k, w.stream(), cfs);
68 }
69
70 class ClassListWriter::IDTable : public ResourceHashtable<
71 const InstanceKlass*, int,
72 15889, // prime number
73 AnyObj::C_HEAP> {};
74
75 ClassListWriter::IDTable* ClassListWriter::_id_table = nullptr;
76 int ClassListWriter::_total_ids = 0;
77
78 int ClassListWriter::get_id(const InstanceKlass* k) {
79 assert_locked();
80 if (_id_table == nullptr) {
81 _id_table = new (mtClass)IDTable();
82 }
83 bool created;
84 int* v = _id_table->put_if_absent(k, &created);
85 if (created) {
86 *v = _total_ids++;
87 }
88 return *v;
89 }
90
91 bool ClassListWriter::has_id(const InstanceKlass* k) {
92 assert_locked();
93 if (_id_table != nullptr) {
94 return _id_table->get(k) != nullptr;
95 } else {
96 return false;
97 }
98 }
99
100 void ClassListWriter::handle_class_unloading(const InstanceKlass* klass) {
101 assert_locked();
102 if (_id_table != nullptr) {
103 _id_table->remove(klass);
104 }
105 }
106
107 void ClassListWriter::write_to_stream(const InstanceKlass* k, outputStream* stream, const ClassFileStream* cfs) {
108 assert_locked();
109
110 ClassLoaderData* loader_data = k->class_loader_data();
111 bool is_builtin_loader = SystemDictionaryShared::is_builtin_loader(loader_data);
112 if (!is_builtin_loader) {
113 // class may be loaded from shared archive
114 if (!k->is_shared()) {
115 if (cfs == nullptr || cfs->source() == nullptr) {
116 // CDS static dump only handles unregistered class with known source.
117 return;
118 }
119 if (strncmp(cfs->source(), "file:", 5) != 0) {
120 return;
121 }
122 } else {
123 // Shared unregistered classes are skipped since their real source are not recorded in shared space.
124 return;
125 }
126 if (!SystemDictionaryShared::add_unregistered_class(Thread::current(), (InstanceKlass*)k)) {
127 return;
128 }
129 }
130
131 // filter out java/lang/invoke/BoundMethodHandle$Species...
132 if (cfs != nullptr && cfs->source() != nullptr && strcmp(cfs->source(), "_ClassSpecializer_generateConcreteSpeciesCode") == 0) {
133 return;
134 }
135
136 {
137 InstanceKlass* super = k->java_super();
138 if (super != nullptr && !has_id(super)) {
139 return;
140 }
141
142 Array<InstanceKlass*>* interfaces = k->local_interfaces();
143 int len = interfaces->length();
144 for (int i = 0; i < len; i++) {
145 InstanceKlass* intf = interfaces->at(i);
146 if (!has_id(intf)) {
147 return;
148 }
149 }
150 }
151
152 if (k->is_hidden()) {
153 return;
154 }
155
156 if (k->module()->is_patched()) {
157 return;
158 }
159
160 ResourceMark rm;
161 stream->print("%s id: %d", k->name()->as_C_string(), get_id(k));
162 if (!is_builtin_loader) {
163 InstanceKlass* super = k->java_super();
164 assert(super != nullptr, "must be");
165 stream->print(" super: %d", get_id(super));
166
167 Array<InstanceKlass*>* interfaces = k->local_interfaces();
168 int len = interfaces->length();
169 if (len > 0) {
170 stream->print(" interfaces:");
171 for (int i = 0; i < len; i++) {
172 InstanceKlass* intf = interfaces->at(i);
173 stream->print(" %d", get_id(intf));
174 }
175 }
176
177 #ifdef _WINDOWS
178 // "file:/C:/dir/foo.jar" -> "C:/dir/foo.jar"
179 stream->print(" source: %s", cfs->source() + 6);
180 #else
181 // "file:/dir/foo.jar" -> "/dir/foo.jar"
182 stream->print(" source: %s", cfs->source() + 5);
183 #endif
184 }
185
186 stream->cr();
187 stream->flush();
188 }
189
190 void ClassListWriter::delete_classlist() {
191 if (_classlist_file != nullptr) {
192 delete _classlist_file;
193 }
194 }
195
196 class ClassListWriter::WriteResolveConstantsCLDClosure : public CLDClosure {
197 public:
198 void do_cld(ClassLoaderData* cld) {
199 for (Klass* klass = cld->klasses(); klass != nullptr; klass = klass->next_link()) {
200 if (klass->is_instance_klass()) {
201 InstanceKlass* ik = InstanceKlass::cast(klass);
202 write_resolved_constants_for(ik);
203 }
204 }
205 }
206 };
207
208 void ClassListWriter::write_resolved_constants() {
209 if (!is_enabled()) {
210 return;
211 }
212 MutexLocker lock(ClassLoaderDataGraph_lock);
213 MutexLocker lock2(ClassListFile_lock, Mutex::_no_safepoint_check_flag);
214
215 WriteResolveConstantsCLDClosure closure;
216 ClassLoaderDataGraph::loaded_cld_do(&closure);
217 }
218
219 void ClassListWriter::write_resolved_constants_for(InstanceKlass* ik) {
220 if (!SystemDictionaryShared::is_builtin_loader(ik->class_loader_data()) ||
221 ik->is_hidden()) {
222 return;
223 }
224 if (LambdaFormInvokers::may_be_regenerated_class(ik->name())) {
225 return;
226 }
227 if (ik->name()->equals("jdk/internal/module/SystemModules$all")) {
228 // This class is regenerated during JDK build process, so the classlist
229 // may not match the version that's in the real jdk image.
230 return;
231 }
232
233 if (!has_id(ik)) { // do not resolve CP for classes loaded by custom loaders.
234 return;
235 }
236
237 ResourceMark rm;
238 ConstantPool* cp = ik->constants();
239 GrowableArray<bool> list(cp->length(), cp->length(), false);
240 bool print = false;
241
242 for (int cp_index = 1; cp_index < cp->length(); cp_index++) { // Index 0 is unused
243 switch (cp->tag_at(cp_index).value()) {
244 case JVM_CONSTANT_Class:
245 {
246 Klass* k = cp->resolved_klass_at(cp_index);
247 if (k->is_instance_klass()) {
248 list.at_put(cp_index, true);
249 print = true;
250 }
251 }
252 break;
253 }
254 }
255
256 if (cp->cache() != nullptr) {
257 Array<ResolvedFieldEntry>* field_entries = cp->cache()->resolved_field_entries();
258 if (field_entries != nullptr) {
259 for (int i = 0; i < field_entries->length(); i++) {
260 ResolvedFieldEntry* rfe = field_entries->adr_at(i);
261 if (rfe->is_resolved(Bytecodes::_getfield) ||
262 rfe->is_resolved(Bytecodes::_putfield)) {
263 list.at_put(rfe->constant_pool_index(), true);
264 print = true;
265 }
266 }
267 }
268
269 Array<ResolvedMethodEntry>* method_entries = cp->cache()->resolved_method_entries();
270 if (method_entries != nullptr) {
271 for (int i = 0; i < method_entries->length(); i++) {
272 ResolvedMethodEntry* rme = method_entries->adr_at(i);
273 if (rme->is_resolved(Bytecodes::_invokevirtual) ||
274 rme->is_resolved(Bytecodes::_invokespecial) ||
275 rme->is_resolved(Bytecodes::_invokeinterface)) {
276 list.at_put(rme->constant_pool_index(), true);
277 print = true;
278 }
279 }
280 }
281 }
282
283 if (print) {
284 outputStream* stream = _classlist_file;
285 stream->print("@cp %s", ik->name()->as_C_string());
286 for (int i = 0; i < list.length(); i++) {
287 if (list.at(i)) {
288 constantTag cp_tag = cp->tag_at(i).value();
289 assert(cp_tag.value() == JVM_CONSTANT_Class ||
290 cp_tag.value() == JVM_CONSTANT_Fieldref ||
291 cp_tag.value() == JVM_CONSTANT_Methodref||
292 cp_tag.value() == JVM_CONSTANT_InterfaceMethodref, "sanity");
293 stream->print(" %d", i);
294 }
295 }
296 stream->cr();
297 }
298 }