1 /*
2 * Copyright (c) 2014, 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 #ifndef SHARE_CLASSFILE_SYSTEMDICTIONARYSHARED_HPP
26 #define SHARE_CLASSFILE_SYSTEMDICTIONARYSHARED_HPP
27
28 #include "cds/cds_globals.hpp"
29 #include "cds/filemap.hpp"
30 #include "cds/dumpTimeClassInfo.hpp"
31 #include "cds/lambdaProxyClassDictionary.hpp"
32 #include "cds/methodDataDictionary.hpp"
33 #include "cds/runTimeClassInfo.hpp"
34 #include "classfile/classLoaderData.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "oops/klass.hpp"
38 #include "oops/oopHandle.hpp"
39 #include "oops/trainingData.hpp"
40
41
42 /*===============================================================================
43
44 Handling of the classes in the AppCDS archive
45
46 To ensure safety and to simplify the implementation, archived classes are
47 "segregated" into 2 types. The following rules describe how they
48 are stored and looked up.
49
50 [1] Category of archived classes
51
52 There are 2 disjoint groups of classes stored in the AppCDS archive:
53
54 BUILTIN: These classes may be defined ONLY by the BOOT/PLATFORM/APP
55 loaders.
56
57 UNREGISTERED: These classes may be defined ONLY by a ClassLoader
58 instance that's not listed above (using fingerprint matching)
59
60 [2] How classes from different categories are specified in the classlist:
61
62 Starting from JDK9, each class in the classlist may be specified with
63 these keywords: "id", "super", "interfaces", "loader" and "source".
64
65
66 BUILTIN Only the "id" keyword may be (optionally) specified. All other
67 keywords are forbidden.
68
69 The named class is looked up from the jimage and from
70 Xbootclasspath/a and CLASSPATH.
71
72 UNREGISTERED: The "id", "super", and "source" keywords must all be
73 specified.
74
75 The "interfaces" keyword must be specified if the class implements
76 one or more local interfaces. The "interfaces" keyword must not be
77 specified if the class does not implement local interfaces.
78
79 The named class is looked up from the location specified in the
80 "source" keyword.
81
82 Example classlist:
83
84 # BUILTIN
85 java/lang/Object id: 0
86 java/lang/Cloneable id: 1
87 java/lang/String
88
89 # UNREGISTERED
90 Bar id: 3 super: 0 interfaces: 1 source: /foo.jar
91
92
93 [3] Identifying the category of archived classes
94
95 BUILTIN: (C->shared_classpath_index() >= 0)
96 UNREGISTERED: (C->shared_classpath_index() == UNREGISTERED_INDEX (-9999))
97
98 [4] Lookup of archived classes at run time:
99
100 (a) BUILTIN loaders:
101
102 search _builtin_dictionary
103
104 (b) UNREGISTERED loaders:
105
106 search _unregistered_dictionary for an entry that matches the
107 (name, clsfile_len, clsfile_crc32).
108
109 ===============================================================================*/
110 #define UNREGISTERED_INDEX -9999
111
112 class BootstrapInfo;
113 class ClassFileStream;
114 class ConstantPoolCache;
115 class Dictionary;
116 class DumpTimeClassInfo;
117 class DumpTimeSharedClassTable;
118 class LambdaProxyClassDictionary;
119 class RunTimeClassInfo;
120 class RunTimeSharedDictionary;
121 class DumpTimeLambdaProxyClassDictionary;
122 class LambdaProxyClassKey;
123
124 class SharedClassLoadingMark {
125 private:
126 Thread* THREAD;
127 InstanceKlass* _klass;
128 public:
129 SharedClassLoadingMark(Thread* current, InstanceKlass* ik) : THREAD(current), _klass(ik) {}
130 ~SharedClassLoadingMark() {
131 assert(THREAD != nullptr, "Current thread is nullptr");
132 assert(_klass != nullptr, "InstanceKlass is nullptr");
133 if (HAS_PENDING_EXCEPTION) {
134 if (_klass->is_shared()) {
135 _klass->set_shared_loading_failed();
136 }
137 }
138 }
139 };
140
141 class SystemDictionaryShared: public SystemDictionary {
142 friend class ExcludeDumpTimeSharedClasses;
143 friend class CleanupDumpTimeLambdaProxyClassTable;
144
145 struct ArchiveInfo {
146 RunTimeSharedDictionary _builtin_dictionary;
147 RunTimeSharedDictionary _unregistered_dictionary;
148 LambdaProxyClassDictionary _lambda_proxy_class_dictionary;
149 MethodDataInfoDictionary _method_info_dictionary;
150
151 const RunTimeLambdaProxyClassInfo* lookup_lambda_proxy_class(LambdaProxyClassKey* key) {
152 return _lambda_proxy_class_dictionary.lookup(key, key->hash(), 0);
153 }
154
155 const RunTimeMethodDataInfo* lookup_method_info(Method* m) {
156 MethodDataKey key(m);
157 return _method_info_dictionary.lookup(&key, key.hash(), 0);
158 }
159
160 void print_on(const char* prefix, outputStream* st);
161 void print_table_statistics(const char* prefix, outputStream* st);
162 };
163
164 public:
165 enum : char {
166 FROM_FIELD_IS_PROTECTED = 1 << 0,
167 FROM_IS_ARRAY = 1 << 1,
168 FROM_IS_OBJECT = 1 << 2
169 };
170
171 private:
172
173 static DumpTimeSharedClassTable* _dumptime_table;
174 static DumpTimeLambdaProxyClassDictionary* _dumptime_lambda_proxy_class_dictionary;
175
176 static DumpTimeMethodInfoDictionary* _dumptime_method_info_dictionary;
177 static DumpTimeMethodInfoDictionary* _cloned_dumptime_method_info_dictionary;
178
179 static ArchiveInfo _static_archive;
180 static ArchiveInfo _dynamic_archive;
181
182 static ArchiveInfo* get_archive(bool is_static_archive) {
183 return is_static_archive ? &_static_archive : &_dynamic_archive;
184 }
185
186 static InstanceKlass* load_shared_class_for_builtin_loader(
187 Symbol* class_name,
188 Handle class_loader,
189 TRAPS);
190 static InstanceKlass* acquire_class_for_current_thread(
191 InstanceKlass *ik,
192 Handle class_loader,
193 Handle protection_domain,
194 const ClassFileStream* cfs,
195 TRAPS);
196
197 static void write_dictionary(RunTimeSharedDictionary* dictionary,
198 bool is_builtin);
199 static void write_lambda_proxy_class_dictionary(LambdaProxyClassDictionary* dictionary);
200 static void write_method_info_dictionary(MethodDataInfoDictionary* dictionary);
201 static void cleanup_lambda_proxy_class_dictionary();
202 static void cleanup_method_info_dictionary();
203 static void reset_registered_lambda_proxy_class(InstanceKlass* ik);
204 static bool is_registered_lambda_proxy_class(InstanceKlass* ik);
205 static bool check_for_exclusion_impl(InstanceKlass* k);
206 static void remove_dumptime_info(InstanceKlass* k) NOT_CDS_RETURN;
207 static InstanceKlass* retrieve_lambda_proxy_class(const RunTimeLambdaProxyClassInfo* info) NOT_CDS_RETURN_(nullptr);
208
209 DEBUG_ONLY(static bool _class_loading_may_happen;)
210
211 public:
212 // Guaranteed to return non-null value for non-shared classes.
213 // k must not be a shared class.
214 static DumpTimeClassInfo* get_info(InstanceKlass* k);
215 static DumpTimeClassInfo* get_info_locked(InstanceKlass* k);
216 static DumpTimeSharedClassTable* dumptime_table() { return _dumptime_table; }
217
218 static bool has_been_redefined(InstanceKlass* k);
219 static bool is_jfr_event_class(InstanceKlass *k);
220 static bool is_hidden_lambda_proxy(InstanceKlass* ik);
221 static bool is_early_klass(InstanceKlass* k); // Was k loaded while JvmtiExport::is_early_phase()==true
222 static bool has_archived_enum_objs(InstanceKlass* ik);
223 static void set_has_archived_enum_objs(InstanceKlass* ik);
224
225 static InstanceKlass* find_builtin_class(Symbol* class_name);
226
227 static const RunTimeClassInfo* find_record(RunTimeSharedDictionary* static_dict,
228 RunTimeSharedDictionary* dynamic_dict,
229 Symbol* name);
230
231 static bool has_platform_or_app_classes();
232
233 // Called by PLATFORM/APP loader only
234 static InstanceKlass* find_or_load_shared_class(Symbol* class_name,
235 Handle class_loader,
236 TRAPS);
237
238 static void preload_archived_classes(TRAPS);
239
240 static void allocate_shared_data_arrays(int size, TRAPS);
241
242 static bool is_builtin_loader(ClassLoaderData* loader_data);
243
244 static InstanceKlass* lookup_super_for_unregistered_class(Symbol* class_name,
245 Symbol* super_name, bool is_superclass);
246
247 static void initialize() NOT_CDS_RETURN;
248 static void init_dumptime_info(InstanceKlass* k) NOT_CDS_RETURN;
249 static void handle_class_unloading(InstanceKlass* k) NOT_CDS_RETURN;
250
251 static bool can_be_preinited(InstanceKlass* ik);
252 static bool can_be_preinited_locked(InstanceKlass* ik);
253 static void reset_preinit_check();
254
255 static Dictionary* boot_loader_dictionary() {
256 return ClassLoaderData::the_null_class_loader_data()->dictionary();
257 }
258
259 static void update_shared_entry(InstanceKlass* klass, int id);
260 static void set_shared_class_misc_info(InstanceKlass* k, ClassFileStream* cfs);
261
262 static InstanceKlass* lookup_from_stream(Symbol* class_name,
263 Handle class_loader,
264 Handle protection_domain,
265 const ClassFileStream* st,
266 TRAPS);
267 // "verification_constraints" are a set of checks performed by
268 // VerificationType::is_reference_assignable_from when verifying a shared class during
269 // dump time.
270 //
271 // With AppCDS, it is possible to override archived classes by calling
272 // ClassLoader.defineClass() directly. SystemDictionary::load_shared_class() already
273 // ensures that you cannot load a shared class if its super type(s) are changed. However,
274 // we need an additional check to ensure that the verification_constraints did not change
275 // between dump time and runtime.
276 static bool add_verification_constraint(InstanceKlass* k, Symbol* name,
277 Symbol* from_name, bool from_field_is_protected,
278 bool from_is_array, bool from_is_object) NOT_CDS_RETURN_(false);
279 static void check_verification_constraints(InstanceKlass* klass,
280 TRAPS) NOT_CDS_RETURN;
281 static void add_enum_klass_static_field(InstanceKlass* ik, int root_index);
282 static void set_class_has_failed_verification(InstanceKlass* ik) NOT_CDS_RETURN;
283 static bool has_class_failed_verification(InstanceKlass* ik) NOT_CDS_RETURN_(false);
284 static void add_lambda_proxy_class(InstanceKlass* caller_ik,
285 InstanceKlass* lambda_ik,
286 Symbol* invoked_name,
287 Symbol* invoked_type,
288 Symbol* method_type,
289 Method* member_method,
290 Symbol* instantiated_method_type, TRAPS) NOT_CDS_RETURN;
291 static void add_to_dump_time_lambda_proxy_class_dictionary(LambdaProxyClassKey& key,
292 InstanceKlass* proxy_klass) NOT_CDS_RETURN;
293 static InstanceKlass* get_shared_lambda_proxy_class(InstanceKlass* caller_ik,
294 Symbol* invoked_name,
295 Symbol* invoked_type,
296 Symbol* method_type,
297 Method* member_method,
298 Symbol* instantiated_method_type) NOT_CDS_RETURN_(nullptr);
299 static InstanceKlass* get_shared_nest_host(InstanceKlass* lambda_ik) NOT_CDS_RETURN_(nullptr);
300 static InstanceKlass* prepare_shared_lambda_proxy_class(InstanceKlass* lambda_ik,
301 InstanceKlass* caller_ik, TRAPS) NOT_CDS_RETURN_(nullptr);
302 static bool check_linking_constraints(Thread* current, InstanceKlass* klass) NOT_CDS_RETURN_(false);
303 static void record_linking_constraint(Symbol* name, InstanceKlass* klass,
304 Handle loader1, Handle loader2) NOT_CDS_RETURN;
305 static bool is_builtin(const InstanceKlass* k) {
306 return (k->shared_classpath_index() != UNREGISTERED_INDEX);
307 }
308 static bool add_unregistered_class(Thread* current, InstanceKlass* k);
309
310 static void check_excluded_classes();
311 static bool check_for_exclusion(InstanceKlass* k, DumpTimeClassInfo* info);
312 static void validate_before_archiving(InstanceKlass* k);
313 static bool is_excluded_class(InstanceKlass* k);
314 static void set_excluded(InstanceKlass* k);
315 static void set_excluded_locked(InstanceKlass* k);
316 static bool warn_excluded(InstanceKlass* k, const char* reason);
317 static void dumptime_classes_do(class MetaspaceClosure* it);
318 static size_t estimate_size_for_archive();
319 static void write_to_archive(bool is_static_archive = true);
320 static void adjust_lambda_proxy_class_dictionary();
321
322 static void adjust_method_info_dictionary();
323
324 static void serialize_dictionary_headers(class SerializeClosure* soc,
325 bool is_static_archive = true);
326 static void serialize_vm_classes(class SerializeClosure* soc);
327 static void print() { return print_on(tty); }
328 static void print_on(outputStream* st) NOT_CDS_RETURN;
329 static void print_shared_archive(outputStream* st, bool is_static = true) NOT_CDS_RETURN;
330 static void print_table_statistics(outputStream* st) NOT_CDS_RETURN;
331 static bool is_dumptime_table_empty() NOT_CDS_RETURN_(true);
332 static bool is_supported_invokedynamic(BootstrapInfo* bsi) NOT_CDS_RETURN_(false);
333 DEBUG_ONLY(static bool class_loading_may_happen() {return _class_loading_may_happen;})
334
335 static MethodData* lookup_method_data(Method* m) {
336 const RunTimeMethodDataInfo* info = _dynamic_archive.lookup_method_info(m);
337 if (info != nullptr) {
338 return info->method_data();
339 }
340 return nullptr;
341 }
342
343 static MethodCounters* lookup_method_counters(Method* m) {
344 const RunTimeMethodDataInfo* info = _dynamic_archive.lookup_method_info(m);
345 if (info != nullptr) {
346 return info->method_counters();
347 }
348 return nullptr;
349 }
350
351 // Do not archive any new InstanceKlasses that are loaded after this method is called.
352 // This avoids polluting the archive with classes that are only used by GenerateJLIClassesHelper.
353 static void ignore_new_classes();
354
355 #ifdef ASSERT
356 // This object marks a critical period when writing the CDS archive. During this
357 // period, the JVM must not load any new classes, so as to avoid adding new
358 // items in the SystemDictionaryShared::_dumptime_table.
359 class NoClassLoadingMark: public StackObj {
360 public:
361 NoClassLoadingMark() {
362 assert(_class_loading_may_happen, "must not be nested");
363 _class_loading_may_happen = false;
364 }
365 ~NoClassLoadingMark() {
366 _class_loading_may_happen = true;
367 }
368 };
369 #endif
370
371 template <typename T>
372 static unsigned int hash_for_shared_dictionary_quick(T* ptr) {
373 assert(MetaspaceObj::is_shared((const MetaspaceObj*)ptr), "must be");
374 assert(ptr > (T*)SharedBaseAddress, "must be");
375 uintx offset = uintx(ptr) - uintx(SharedBaseAddress);
376 return primitive_hash<uintx>(offset);
377 }
378
379 static unsigned int hash_for_shared_dictionary(address ptr);
380 static const char* class_loader_name_for_shared(Klass* k);
381 static void create_loader_positive_lookup_cache(TRAPS);
382 };
383
384 #endif // SHARE_CLASSFILE_SYSTEMDICTIONARYSHARED_HPP