1 /*
2 * Copyright (c) 2014, 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/classFileStream.hpp"
27 #include "classfile/classListParser.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/classLoaderDataGraph.hpp"
31 #include "classfile/classLoaderExt.hpp"
32 #include "classfile/dictionary.hpp"
33 #include "classfile/javaClasses.hpp"
34 #include "classfile/symbolTable.hpp"
35 #include "classfile/systemDictionary.hpp"
36 #include "classfile/systemDictionaryShared.hpp"
37 #include "classfile/verificationType.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "logging/log.hpp"
40 #include "memory/allocation.hpp"
41 #include "memory/archiveUtils.hpp"
42 #include "memory/filemap.hpp"
43 #include "memory/metadataFactory.hpp"
44 #include "memory/metaspaceClosure.hpp"
45 #include "memory/oopFactory.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "memory/universe.hpp"
48 #include "memory/dynamicArchive.hpp"
49 #include "oops/instanceKlass.hpp"
50 #include "oops/klass.inline.hpp"
51 #include "oops/objArrayOop.inline.hpp"
52 #include "oops/oop.inline.hpp"
53 #include "oops/typeArrayOop.inline.hpp"
54 #include "runtime/handles.inline.hpp"
55 #include "runtime/java.hpp"
56 #include "runtime/javaCalls.hpp"
57 #include "runtime/mutexLocker.hpp"
58 #include "utilities/hashtable.inline.hpp"
59 #include "utilities/resourceHash.hpp"
60 #include "utilities/stringUtils.hpp"
61
62
63 objArrayOop SystemDictionaryShared::_shared_protection_domains = NULL;
64 objArrayOop SystemDictionaryShared::_shared_jar_urls = NULL;
65 objArrayOop SystemDictionaryShared::_shared_jar_manifests = NULL;
66 DEBUG_ONLY(bool SystemDictionaryShared::_no_class_loading_should_happen = false;)
67
68 class DumpTimeSharedClassInfo: public CHeapObj<mtClass> {
69 bool _excluded;
70 public:
71 struct DTConstraint {
72 Symbol* _name;
73 Symbol* _from_name;
74 DTConstraint() : _name(NULL), _from_name(NULL) {}
75 DTConstraint(Symbol* n, Symbol* fn) : _name(n), _from_name(fn) {}
76 };
77
78 InstanceKlass* _klass;
79 bool _failed_verification;
80 int _id;
81 int _clsfile_size;
82 int _clsfile_crc32;
83 GrowableArray<DTConstraint>* _verifier_constraints;
84 GrowableArray<char>* _verifier_constraint_flags;
85
86 DumpTimeSharedClassInfo() {
87 _klass = NULL;
88 _failed_verification = false;
89 _id = -1;
90 _clsfile_size = -1;
91 _clsfile_crc32 = -1;
92 _excluded = false;
93 _verifier_constraints = NULL;
94 _verifier_constraint_flags = NULL;
95 }
96
97 void add_verification_constraint(InstanceKlass* k, Symbol* name,
98 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object);
99
100 bool is_builtin() {
101 return SystemDictionaryShared::is_builtin(_klass);
102 }
103
104 int num_constraints() {
105 if (_verifier_constraint_flags != NULL) {
106 return _verifier_constraint_flags->length();
107 } else {
108 return 0;
109 }
110 }
111
112 void metaspace_pointers_do(MetaspaceClosure* it) {
113 it->push(&_klass);
114 if (_verifier_constraints != NULL) {
115 for (int i = 0; i < _verifier_constraints->length(); i++) {
116 DTConstraint* cons = _verifier_constraints->adr_at(i);
117 it->push(&cons->_name);
118 it->push(&cons->_from_name);
119 }
120 }
121 }
122
123 void set_excluded() {
124 _excluded = true;
125 }
126
127 bool is_excluded() {
128 // _klass may become NULL due to DynamicArchiveBuilder::set_to_null
129 return _excluded || _failed_verification || _klass == NULL;
130 }
131
132 void set_failed_verification() {
133 _failed_verification = true;
134 }
135
136 bool failed_verification() {
137 return _failed_verification;
138 }
139 };
140
141 class DumpTimeSharedClassTable: public ResourceHashtable<
142 InstanceKlass*,
143 DumpTimeSharedClassInfo,
144 primitive_hash<InstanceKlass*>,
145 primitive_equals<InstanceKlass*>,
146 15889, // prime number
147 ResourceObj::C_HEAP>
148 {
149 int _builtin_count;
150 int _unregistered_count;
151 public:
152 DumpTimeSharedClassInfo* find_or_allocate_info_for(InstanceKlass* k) {
153 DumpTimeSharedClassInfo* p = get(k);
154 if (p == NULL) {
155 assert(!SystemDictionaryShared::no_class_loading_should_happen(),
156 "no new classes can be loaded while dumping archive");
157 put(k, DumpTimeSharedClassInfo());
158 p = get(k);
159 assert(p != NULL, "sanity");
160 p->_klass = k;
161 }
162 return p;
163 }
164
165 class CountClassByCategory : StackObj {
166 DumpTimeSharedClassTable* _table;
167 public:
168 CountClassByCategory(DumpTimeSharedClassTable* table) : _table(table) {}
169 bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) {
170 if (!info.is_excluded()) {
171 if (info.is_builtin()) {
172 ++ _table->_builtin_count;
173 } else {
174 ++ _table->_unregistered_count;
175 }
176 }
177 return true; // keep on iterating
178 }
179 };
180
181 void update_counts() {
182 _builtin_count = 0;
183 _unregistered_count = 0;
184 CountClassByCategory counter(this);
185 iterate(&counter);
186 }
187
188 int count_of(bool is_builtin) const {
189 if (is_builtin) {
190 return _builtin_count;
191 } else {
192 return _unregistered_count;
193 }
194 }
195 };
196
197 class RunTimeSharedClassInfo {
198 public:
199 struct CrcInfo {
200 int _clsfile_size;
201 int _clsfile_crc32;
202 };
203
204 // This is different than DumpTimeSharedClassInfo::DTConstraint. We use
205 // u4 instead of Symbol* to save space on 64-bit CPU.
206 struct RTConstraint {
207 u4 _name;
208 u4 _from_name;
209 };
210
211 InstanceKlass* _klass;
212 int _num_constraints;
213
214 // optional CrcInfo _crc; (only for UNREGISTERED classes)
215 // optional RTConstraint _verifier_constraints[_num_constraints]
216 // optional char _verifier_constraint_flags[_num_constraints]
217
218 private:
219 static size_t header_size_size() {
220 return sizeof(RunTimeSharedClassInfo);
221 }
222 static size_t crc_size(InstanceKlass* klass) {
223 if (!SystemDictionaryShared::is_builtin(klass)) {
224 return sizeof(CrcInfo);
225 } else {
226 return 0;
227 }
228 }
229 static size_t verifier_constraints_size(int num_constraints) {
230 return sizeof(RTConstraint) * num_constraints;
231 }
232 static size_t verifier_constraint_flags_size(int num_constraints) {
233 return sizeof(char) * num_constraints;
234 }
235
236 public:
237 static size_t byte_size(InstanceKlass* klass, int num_constraints) {
238 return header_size_size() +
239 crc_size(klass) +
240 verifier_constraints_size(num_constraints) +
241 verifier_constraint_flags_size(num_constraints);
242 }
243
244 private:
245 size_t crc_offset() const {
246 return header_size_size();
247 }
248 size_t verifier_constraints_offset() const {
249 return crc_offset() + crc_size(_klass);
250 }
251 size_t verifier_constraint_flags_offset() const {
252 return verifier_constraints_offset() + verifier_constraints_size(_num_constraints);
253 }
254
255 void check_constraint_offset(int i) const {
256 assert(0 <= i && i < _num_constraints, "sanity");
257 }
258
259 public:
260 CrcInfo* crc() const {
261 assert(crc_size(_klass) > 0, "must be");
262 return (CrcInfo*)(address(this) + crc_offset());
263 }
264 RTConstraint* verifier_constraints() {
265 assert(_num_constraints > 0, "sanity");
266 return (RTConstraint*)(address(this) + verifier_constraints_offset());
267 }
268 RTConstraint* verifier_constraint_at(int i) {
269 check_constraint_offset(i);
270 return verifier_constraints() + i;
271 }
272
273 char* verifier_constraint_flags() {
274 assert(_num_constraints > 0, "sanity");
275 return (char*)(address(this) + verifier_constraint_flags_offset());
276 }
277
278 static u4 object_delta_u4(Symbol* sym) {
279 if (DynamicDumpSharedSpaces) {
280 sym = DynamicArchive::original_to_target(sym);
281 }
282 return MetaspaceShared::object_delta_u4(sym);
283 }
284
285 void init(DumpTimeSharedClassInfo& info) {
286 _klass = info._klass;
287 if (!SystemDictionaryShared::is_builtin(_klass)) {
288 CrcInfo* c = crc();
289 c->_clsfile_size = info._clsfile_size;
290 c->_clsfile_crc32 = info._clsfile_crc32;
291 }
292 _num_constraints = info.num_constraints();
293 if (_num_constraints > 0) {
294 RTConstraint* constraints = verifier_constraints();
295 char* flags = verifier_constraint_flags();
296 int i;
297 for (i = 0; i < _num_constraints; i++) {
298 constraints[i]._name = object_delta_u4(info._verifier_constraints->at(i)._name);
299 constraints[i]._from_name = object_delta_u4(info._verifier_constraints->at(i)._from_name);
300 }
301 for (i = 0; i < _num_constraints; i++) {
302 flags[i] = info._verifier_constraint_flags->at(i);
303 }
304 }
305 if (DynamicDumpSharedSpaces) {
306 _klass = DynamicArchive::original_to_target(info._klass);
307 }
308 ArchivePtrMarker::mark_pointer(&_klass);
309 }
310
311 bool matches(int clsfile_size, int clsfile_crc32) const {
312 return crc()->_clsfile_size == clsfile_size &&
313 crc()->_clsfile_crc32 == clsfile_crc32;
314 }
315
316 Symbol* get_constraint_name(int i) {
317 return (Symbol*)(SharedBaseAddress + verifier_constraint_at(i)->_name);
318 }
319 Symbol* get_constraint_from_name(int i) {
320 return (Symbol*)(SharedBaseAddress + verifier_constraint_at(i)->_from_name);
321 }
322
323 char get_constraint_flag(int i) {
324 check_constraint_offset(i);
325 return verifier_constraint_flags()[i];
326 }
327
328 private:
329 // ArchiveCompactor::allocate() has reserved a pointer immediately before
330 // archived InstanceKlasses. We can use this slot to do a quick
331 // lookup of InstanceKlass* -> RunTimeSharedClassInfo* without
332 // building a new hashtable.
333 //
334 // info_pointer_addr(klass) --> 0x0100 RunTimeSharedClassInfo*
335 // InstanceKlass* klass --> 0x0108 <C++ vtbl>
336 // 0x0110 fields from Klass ...
337 static RunTimeSharedClassInfo** info_pointer_addr(InstanceKlass* klass) {
338 return &((RunTimeSharedClassInfo**)klass)[-1];
339 }
340
341 public:
342 static RunTimeSharedClassInfo* get_for(InstanceKlass* klass) {
343 return *info_pointer_addr(klass);
344 }
345 static void set_for(InstanceKlass* klass, RunTimeSharedClassInfo* record) {
346 if (DynamicDumpSharedSpaces) {
347 klass = DynamicArchive::original_to_buffer(klass);
348 *info_pointer_addr(klass) = DynamicArchive::buffer_to_target(record);
349 } else {
350 *info_pointer_addr(klass) = record;
351 }
352
353 ArchivePtrMarker::mark_pointer(info_pointer_addr(klass));
354 }
355
356 // Used by RunTimeSharedDictionary to implement OffsetCompactHashtable::EQUALS
357 static inline bool EQUALS(
358 const RunTimeSharedClassInfo* value, Symbol* key, int len_unused) {
359 return (value->_klass->name() == key);
360 }
361 };
362
363 class RunTimeSharedDictionary : public OffsetCompactHashtable<
364 Symbol*,
365 const RunTimeSharedClassInfo*,
366 RunTimeSharedClassInfo::EQUALS> {};
367
368 static DumpTimeSharedClassTable* _dumptime_table = NULL;
369 // SystemDictionaries in the base layer static archive
370 static RunTimeSharedDictionary _builtin_dictionary;
371 static RunTimeSharedDictionary _unregistered_dictionary;
372 // SystemDictionaries in the top layer dynamic archive
373 static RunTimeSharedDictionary _dynamic_builtin_dictionary;
374 static RunTimeSharedDictionary _dynamic_unregistered_dictionary;
375
376 oop SystemDictionaryShared::shared_protection_domain(int index) {
377 return _shared_protection_domains->obj_at(index);
378 }
379
380 oop SystemDictionaryShared::shared_jar_url(int index) {
381 return _shared_jar_urls->obj_at(index);
382 }
383
384 oop SystemDictionaryShared::shared_jar_manifest(int index) {
385 return _shared_jar_manifests->obj_at(index);
386 }
387
388
389 Handle SystemDictionaryShared::get_shared_jar_manifest(int shared_path_index, TRAPS) {
390 Handle manifest ;
391 if (shared_jar_manifest(shared_path_index) == NULL) {
392 SharedClassPathEntry* ent = FileMapInfo::shared_path(shared_path_index);
393 long size = ent->manifest_size();
394 if (size <= 0) {
395 return Handle();
396 }
397
398 // ByteArrayInputStream bais = new ByteArrayInputStream(buf);
399 const char* src = ent->manifest();
400 assert(src != NULL, "No Manifest data");
401 typeArrayOop buf = oopFactory::new_byteArray(size, CHECK_NH);
402 typeArrayHandle bufhandle(THREAD, buf);
403 ArrayAccess<>::arraycopy_from_native(reinterpret_cast<const jbyte*>(src),
404 buf, typeArrayOopDesc::element_offset<jbyte>(0), size);
405
406 Handle bais = JavaCalls::construct_new_instance(SystemDictionary::ByteArrayInputStream_klass(),
407 vmSymbols::byte_array_void_signature(),
408 bufhandle, CHECK_NH);
409
410 // manifest = new Manifest(bais)
411 manifest = JavaCalls::construct_new_instance(SystemDictionary::Jar_Manifest_klass(),
412 vmSymbols::input_stream_void_signature(),
413 bais, CHECK_NH);
414 atomic_set_shared_jar_manifest(shared_path_index, manifest());
415 }
416
417 manifest = Handle(THREAD, shared_jar_manifest(shared_path_index));
418 assert(manifest.not_null(), "sanity");
419 return manifest;
420 }
421
422 Handle SystemDictionaryShared::get_shared_jar_url(int shared_path_index, TRAPS) {
423 Handle url_h;
424 if (shared_jar_url(shared_path_index) == NULL) {
425 JavaValue result(T_OBJECT);
426 const char* path = FileMapInfo::shared_path_name(shared_path_index);
427 Handle path_string = java_lang_String::create_from_str(path, CHECK_(url_h));
428 Klass* classLoaders_klass =
429 SystemDictionary::jdk_internal_loader_ClassLoaders_klass();
430 JavaCalls::call_static(&result, classLoaders_klass,
431 vmSymbols::toFileURL_name(),
432 vmSymbols::toFileURL_signature(),
433 path_string, CHECK_(url_h));
434
435 atomic_set_shared_jar_url(shared_path_index, (oop)result.get_jobject());
436 }
437
438 url_h = Handle(THREAD, shared_jar_url(shared_path_index));
439 assert(url_h.not_null(), "sanity");
440 return url_h;
441 }
442
443 Handle SystemDictionaryShared::get_package_name(Symbol* class_name, TRAPS) {
444 ResourceMark rm(THREAD);
445 Handle pkgname_string;
446 Symbol* pkg = ClassLoader::package_from_class_name(class_name);
447 if (pkg != NULL) { // Package prefix found
448 const char* pkgname = pkg->as_klass_external_name();
449 pkgname_string = java_lang_String::create_from_str(pkgname,
450 CHECK_(pkgname_string));
451 }
452 return pkgname_string;
453 }
454
455 // Define Package for shared app classes from JAR file and also checks for
456 // package sealing (all done in Java code)
457 // See http://docs.oracle.com/javase/tutorial/deployment/jar/sealman.html
458 void SystemDictionaryShared::define_shared_package(Symbol* class_name,
459 Handle class_loader,
460 Handle manifest,
461 Handle url,
462 TRAPS) {
463 assert(SystemDictionary::is_system_class_loader(class_loader()), "unexpected class loader");
464 // get_package_name() returns a NULL handle if the class is in unnamed package
465 Handle pkgname_string = get_package_name(class_name, CHECK);
466 if (pkgname_string.not_null()) {
467 Klass* app_classLoader_klass = SystemDictionary::jdk_internal_loader_ClassLoaders_AppClassLoader_klass();
468 JavaValue result(T_OBJECT);
469 JavaCallArguments args(3);
470 args.set_receiver(class_loader);
471 args.push_oop(pkgname_string);
472 args.push_oop(manifest);
473 args.push_oop(url);
474 JavaCalls::call_virtual(&result, app_classLoader_klass,
475 vmSymbols::defineOrCheckPackage_name(),
476 vmSymbols::defineOrCheckPackage_signature(),
477 &args,
478 CHECK);
479 }
480 }
481
482 // Define Package for shared app/platform classes from named module
483 void SystemDictionaryShared::define_shared_package(Symbol* class_name,
484 Handle class_loader,
485 ModuleEntry* mod_entry,
486 TRAPS) {
487 assert(mod_entry != NULL, "module_entry should not be NULL");
488 Handle module_handle(THREAD, mod_entry->module());
489
490 Handle pkg_name = get_package_name(class_name, CHECK);
491 assert(pkg_name.not_null(), "Package should not be null for class in named module");
492
493 Klass* classLoader_klass;
494 if (SystemDictionary::is_system_class_loader(class_loader())) {
495 classLoader_klass = SystemDictionary::jdk_internal_loader_ClassLoaders_AppClassLoader_klass();
496 } else {
497 assert(SystemDictionary::is_platform_class_loader(class_loader()), "unexpected classloader");
498 classLoader_klass = SystemDictionary::jdk_internal_loader_ClassLoaders_PlatformClassLoader_klass();
499 }
500
501 JavaValue result(T_OBJECT);
502 JavaCallArguments args(2);
503 args.set_receiver(class_loader);
504 args.push_oop(pkg_name);
505 args.push_oop(module_handle);
506 JavaCalls::call_virtual(&result, classLoader_klass,
507 vmSymbols::definePackage_name(),
508 vmSymbols::definePackage_signature(),
509 &args,
510 CHECK);
511 }
512
513 // Get the ProtectionDomain associated with the CodeSource from the classloader.
514 Handle SystemDictionaryShared::get_protection_domain_from_classloader(Handle class_loader,
515 Handle url, TRAPS) {
516 // CodeSource cs = new CodeSource(url, null);
517 Handle cs = JavaCalls::construct_new_instance(SystemDictionary::CodeSource_klass(),
518 vmSymbols::url_code_signer_array_void_signature(),
519 url, Handle(), CHECK_NH);
520
521 // protection_domain = SecureClassLoader.getProtectionDomain(cs);
522 Klass* secureClassLoader_klass = SystemDictionary::SecureClassLoader_klass();
523 JavaValue obj_result(T_OBJECT);
524 JavaCalls::call_virtual(&obj_result, class_loader, secureClassLoader_klass,
525 vmSymbols::getProtectionDomain_name(),
526 vmSymbols::getProtectionDomain_signature(),
527 cs, CHECK_NH);
528 return Handle(THREAD, (oop)obj_result.get_jobject());
529 }
530
531 // Returns the ProtectionDomain associated with the JAR file identified by the url.
532 Handle SystemDictionaryShared::get_shared_protection_domain(Handle class_loader,
533 int shared_path_index,
534 Handle url,
535 TRAPS) {
536 Handle protection_domain;
537 if (shared_protection_domain(shared_path_index) == NULL) {
538 Handle pd = get_protection_domain_from_classloader(class_loader, url, THREAD);
539 atomic_set_shared_protection_domain(shared_path_index, pd());
540 }
541
542 // Acquire from the cache because if another thread beats the current one to
543 // set the shared protection_domain and the atomic_set fails, the current thread
544 // needs to get the updated protection_domain from the cache.
545 protection_domain = Handle(THREAD, shared_protection_domain(shared_path_index));
546 assert(protection_domain.not_null(), "sanity");
547 return protection_domain;
548 }
549
550 // Returns the ProtectionDomain associated with the moduleEntry.
551 Handle SystemDictionaryShared::get_shared_protection_domain(Handle class_loader,
552 ModuleEntry* mod, TRAPS) {
553 ClassLoaderData *loader_data = mod->loader_data();
554 if (mod->shared_protection_domain() == NULL) {
555 Symbol* location = mod->location();
556 if (location != NULL) {
557 Handle location_string = java_lang_String::create_from_symbol(
558 location, CHECK_NH);
559 Handle url;
560 JavaValue result(T_OBJECT);
561 if (location->starts_with("jrt:/")) {
562 url = JavaCalls::construct_new_instance(SystemDictionary::URL_klass(),
563 vmSymbols::string_void_signature(),
564 location_string, CHECK_NH);
565 } else {
566 Klass* classLoaders_klass =
567 SystemDictionary::jdk_internal_loader_ClassLoaders_klass();
568 JavaCalls::call_static(&result, classLoaders_klass, vmSymbols::toFileURL_name(),
569 vmSymbols::toFileURL_signature(),
570 location_string, CHECK_NH);
571 url = Handle(THREAD, (oop)result.get_jobject());
572 }
573
574 Handle pd = get_protection_domain_from_classloader(class_loader, url,
575 CHECK_NH);
576 mod->set_shared_protection_domain(loader_data, pd);
577 }
578 }
579
580 Handle protection_domain(THREAD, mod->shared_protection_domain());
581 assert(protection_domain.not_null(), "sanity");
582 return protection_domain;
583 }
584
585 // Initializes the java.lang.Package and java.security.ProtectionDomain objects associated with
586 // the given InstanceKlass.
587 // Returns the ProtectionDomain for the InstanceKlass.
588 Handle SystemDictionaryShared::init_security_info(Handle class_loader, InstanceKlass* ik, PackageEntry* pkg_entry, TRAPS) {
589 Handle pd;
590
591 if (ik != NULL) {
592 int index = ik->shared_classpath_index();
593 assert(index >= 0, "Sanity");
594 SharedClassPathEntry* ent = FileMapInfo::shared_path(index);
595 Symbol* class_name = ik->name();
596
597 if (ent->is_modules_image()) {
598 // For shared app/platform classes originated from the run-time image:
599 // The ProtectionDomains are cached in the corresponding ModuleEntries
600 // for fast access by the VM.
601 if (pkg_entry != NULL) {
602 ModuleEntry* mod_entry = pkg_entry->module();
603 pd = get_shared_protection_domain(class_loader, mod_entry, THREAD);
604 define_shared_package(class_name, class_loader, mod_entry, CHECK_(pd));
605 }
606 } else {
607 // For shared app/platform classes originated from JAR files on the class path:
608 // Each of the 3 SystemDictionaryShared::_shared_xxx arrays has the same length
609 // as the shared classpath table in the shared archive (see
610 // FileMap::_shared_path_table in filemap.hpp for details).
611 //
612 // If a shared InstanceKlass k is loaded from the class path, let
613 //
614 // index = k->shared_classpath_index():
615 //
616 // FileMap::_shared_path_table[index] identifies the JAR file that contains k.
617 //
618 // k's protection domain is:
619 //
620 // ProtectionDomain pd = _shared_protection_domains[index];
621 //
622 // and k's Package is initialized using
623 //
624 // manifest = _shared_jar_manifests[index];
625 // url = _shared_jar_urls[index];
626 // define_shared_package(class_name, class_loader, manifest, url, CHECK_(pd));
627 //
628 // Note that if an element of these 3 _shared_xxx arrays is NULL, it will be initialized by
629 // the corresponding SystemDictionaryShared::get_shared_xxx() function.
630 Handle manifest = get_shared_jar_manifest(index, CHECK_(pd));
631 Handle url = get_shared_jar_url(index, CHECK_(pd));
632 define_shared_package(class_name, class_loader, manifest, url, CHECK_(pd));
633 pd = get_shared_protection_domain(class_loader, index, url, CHECK_(pd));
634 }
635 }
636 return pd;
637 }
638
639 bool SystemDictionaryShared::is_sharing_possible(ClassLoaderData* loader_data) {
640 oop class_loader = loader_data->class_loader();
641 return (class_loader == NULL ||
642 SystemDictionary::is_system_class_loader(class_loader) ||
643 SystemDictionary::is_platform_class_loader(class_loader));
644 }
645
646 // Currently AppCDS only archives classes from the run-time image, the
647 // -Xbootclasspath/a path, the class path, and the module path.
648 //
649 // Check if a shared class can be loaded by the specific classloader. Following
650 // are the "visible" archived classes for different classloaders.
651 //
652 // NULL classloader:
653 // - see SystemDictionary::is_shared_class_visible()
654 // Platform classloader:
655 // - Module class from runtime image. ModuleEntry must be defined in the
656 // classloader.
657 // App classloader:
658 // - Module Class from runtime image and module path. ModuleEntry must be defined in the
659 // classloader.
660 // - Class from -cp. The class must have no PackageEntry defined in any of the
661 // boot/platform/app classloader, or must be in the unnamed module defined in the
662 // AppClassLoader.
663 bool SystemDictionaryShared::is_shared_class_visible_for_classloader(
664 InstanceKlass* ik,
665 Handle class_loader,
666 Symbol* pkg_name,
667 PackageEntry* pkg_entry,
668 ModuleEntry* mod_entry,
669 TRAPS) {
670 assert(class_loader.not_null(), "Class loader should not be NULL");
671 assert(Universe::is_module_initialized(), "Module system is not initialized");
672 ResourceMark rm(THREAD);
673
674 int path_index = ik->shared_classpath_index();
675 SharedClassPathEntry* ent =
676 (SharedClassPathEntry*)FileMapInfo::shared_path(path_index);
677
678 if (SystemDictionary::is_platform_class_loader(class_loader())) {
679 assert(ent != NULL, "shared class for PlatformClassLoader should have valid SharedClassPathEntry");
680 // The PlatformClassLoader can only load archived class originated from the
681 // run-time image. The class' PackageEntry/ModuleEntry must be
682 // defined by the PlatformClassLoader.
683 if (mod_entry != NULL) {
684 // PackageEntry/ModuleEntry is found in the classloader. Check if the
685 // ModuleEntry's location agrees with the archived class' origination.
686 if (ent->is_modules_image() && mod_entry->location()->starts_with("jrt:")) {
687 return true; // Module class from the runtime image
688 }
689 }
690 } else if (SystemDictionary::is_system_class_loader(class_loader())) {
691 assert(ent != NULL, "shared class for system loader should have valid SharedClassPathEntry");
692 if (pkg_name == NULL) {
693 // The archived class is in the unnamed package. Currently, the boot image
694 // does not contain any class in the unnamed package.
695 assert(!ent->is_modules_image(), "Class in the unnamed package must be from the classpath");
696 if (path_index >= ClassLoaderExt::app_class_paths_start_index()) {
697 assert(path_index < ClassLoaderExt::app_module_paths_start_index(), "invalid path_index");
698 return true;
699 }
700 } else {
701 // Check if this is from a PackageEntry/ModuleEntry defined in the AppClassloader.
702 if (pkg_entry == NULL) {
703 // It's not guaranteed that the class is from the classpath if the
704 // PackageEntry cannot be found from the AppClassloader. Need to check
705 // the boot and platform classloader as well.
706 ClassLoaderData* platform_loader_data =
707 ClassLoaderData::class_loader_data_or_null(SystemDictionary::java_platform_loader()); // can be NULL during bootstrap
708 if ((platform_loader_data == NULL ||
709 ClassLoader::get_package_entry(pkg_name, platform_loader_data) == NULL) &&
710 ClassLoader::get_package_entry(pkg_name, ClassLoaderData::the_null_class_loader_data()) == NULL) {
711 // The PackageEntry is not defined in any of the boot/platform/app classloaders.
712 // The archived class must from -cp path and not from the runtime image.
713 if (!ent->is_modules_image() && path_index >= ClassLoaderExt::app_class_paths_start_index() &&
714 path_index < ClassLoaderExt::app_module_paths_start_index()) {
715 return true;
716 }
717 }
718 } else if (mod_entry != NULL) {
719 // The package/module is defined in the AppClassLoader. We support
720 // archiving application module class from the runtime image or from
721 // a named module from a module path.
722 // Packages from the -cp path are in the unnamed_module.
723 if (ent->is_modules_image() && mod_entry->location()->starts_with("jrt:")) {
724 // shared module class from runtime image
725 return true;
726 } else if (pkg_entry->in_unnamed_module() && path_index >= ClassLoaderExt::app_class_paths_start_index() &&
727 path_index < ClassLoaderExt::app_module_paths_start_index()) {
728 // shared class from -cp
729 DEBUG_ONLY( \
730 ClassLoaderData* loader_data = class_loader_data(class_loader); \
731 assert(mod_entry == loader_data->unnamed_module(), "the unnamed module is not defined in the classloader");)
732 return true;
733 } else {
734 if(!pkg_entry->in_unnamed_module() &&
735 (path_index >= ClassLoaderExt::app_module_paths_start_index())&&
736 (path_index < FileMapInfo::get_number_of_shared_paths()) &&
737 (strcmp(ent->name(), ClassLoader::skip_uri_protocol(mod_entry->location()->as_C_string())) == 0)) {
738 // shared module class from module path
739 return true;
740 } else {
741 assert(path_index < FileMapInfo::get_number_of_shared_paths(), "invalid path_index");
742 }
743 }
744 }
745 }
746 } else {
747 // TEMP: if a shared class can be found by a custom loader, consider it visible now.
748 // FIXME: is this actually correct?
749 return true;
750 }
751 return false;
752 }
753
754 bool SystemDictionaryShared::has_platform_or_app_classes() {
755 if (FileMapInfo::current_info()->has_platform_or_app_classes()) {
756 return true;
757 }
758 if (DynamicArchive::is_mapped() &&
759 FileMapInfo::dynamic_info()->has_platform_or_app_classes()) {
760 return true;
761 }
762 return false;
763 }
764
765 // The following stack shows how this code is reached:
766 //
767 // [0] SystemDictionaryShared::find_or_load_shared_class()
768 // [1] JVM_FindLoadedClass
769 // [2] java.lang.ClassLoader.findLoadedClass0()
770 // [3] java.lang.ClassLoader.findLoadedClass()
771 // [4] jdk.internal.loader.BuiltinClassLoader.loadClassOrNull()
772 // [5] jdk.internal.loader.BuiltinClassLoader.loadClass()
773 // [6] jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(), or
774 // jdk.internal.loader.ClassLoaders$PlatformClassLoader.loadClass()
775 //
776 // AppCDS supports fast class loading for these 2 built-in class loaders:
777 // jdk.internal.loader.ClassLoaders$PlatformClassLoader
778 // jdk.internal.loader.ClassLoaders$AppClassLoader
779 // with the following assumptions (based on the JDK core library source code):
780 //
781 // [a] these two loaders use the BuiltinClassLoader.loadClassOrNull() to
782 // load the named class.
783 // [b] BuiltinClassLoader.loadClassOrNull() first calls findLoadedClass(name).
784 // [c] At this point, if we can find the named class inside the
785 // shared_dictionary, we can perform further checks (see
786 // is_shared_class_visible_for_classloader() to ensure that this class
787 // was loaded by the same class loader during dump time.
788 //
789 // Given these assumptions, we intercept the findLoadedClass() call to invoke
790 // SystemDictionaryShared::find_or_load_shared_class() to load the shared class from
791 // the archive for the 2 built-in class loaders. This way,
792 // we can improve start-up because we avoid decoding the classfile,
793 // and avoid delegating to the parent loader.
794 //
795 // NOTE: there's a lot of assumption about the Java code. If any of that change, this
796 // needs to be redesigned.
797
798 InstanceKlass* SystemDictionaryShared::find_or_load_shared_class(
799 Symbol* name, Handle class_loader, TRAPS) {
800 InstanceKlass* k = NULL;
801 if (UseSharedSpaces) {
802 if (!has_platform_or_app_classes()) {
803 return NULL;
804 }
805
806 if (SystemDictionary::is_system_class_loader(class_loader()) ||
807 SystemDictionary::is_platform_class_loader(class_loader())) {
808 // Fix for 4474172; see evaluation for more details
809 class_loader = Handle(
810 THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader()));
811 ClassLoaderData *loader_data = register_loader(class_loader);
812 Dictionary* dictionary = loader_data->dictionary();
813
814 unsigned int d_hash = dictionary->compute_hash(name);
815
816 bool DoObjectLock = true;
817 if (is_parallelCapable(class_loader)) {
818 DoObjectLock = false;
819 }
820
821 // Make sure we are synchronized on the class loader before we proceed
822 //
823 // Note: currently, find_or_load_shared_class is called only from
824 // JVM_FindLoadedClass and used for PlatformClassLoader and AppClassLoader,
825 // which are parallel-capable loaders, so this lock is NOT taken.
826 Handle lockObject = compute_loader_lock_object(class_loader, THREAD);
827 check_loader_lock_contention(lockObject, THREAD);
828 ObjectLocker ol(lockObject, THREAD, DoObjectLock);
829
830 {
831 MutexLocker mu(THREAD, SystemDictionary_lock);
832 InstanceKlass* check = find_class(d_hash, name, dictionary);
833 if (check != NULL) {
834 return check;
835 }
836 }
837
838 k = load_shared_class_for_builtin_loader(name, class_loader, THREAD);
839 if (k != NULL) {
840 define_instance_class(k, CHECK_NULL);
841 }
842 }
843 }
844 return k;
845 }
846
847 PackageEntry* SystemDictionaryShared::get_package_entry_from_class_name(Handle class_loader, Symbol* class_name) {
848 PackageEntry* pkg_entry = NULL;
849 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name);
850 if (pkg_name != NULL) {
851 pkg_entry = class_loader_data(class_loader)->packages()->lookup_only(pkg_name);
852 }
853 return pkg_entry;
854 }
855
856 InstanceKlass* SystemDictionaryShared::load_shared_class_for_builtin_loader(
857 Symbol* class_name, Handle class_loader, TRAPS) {
858 assert(UseSharedSpaces, "must be");
859 InstanceKlass* ik = find_builtin_class(class_name);
860
861 if (ik != NULL) {
862 if ((ik->is_shared_app_class() &&
863 SystemDictionary::is_system_class_loader(class_loader())) ||
864 (ik->is_shared_platform_class() &&
865 SystemDictionary::is_platform_class_loader(class_loader()))) {
866 PackageEntry* pkg_entry = get_package_entry_from_class_name(class_loader, class_name);
867 Handle protection_domain =
868 SystemDictionaryShared::init_security_info(class_loader, ik, pkg_entry, CHECK_NULL);
869 return load_shared_class(ik, class_loader, protection_domain, NULL, pkg_entry, THREAD);
870 }
871 }
872 return NULL;
873 }
874
875 void SystemDictionaryShared::oops_do(OopClosure* f) {
876 f->do_oop((oop*)&_shared_protection_domains);
877 f->do_oop((oop*)&_shared_jar_urls);
878 f->do_oop((oop*)&_shared_jar_manifests);
879 }
880
881 void SystemDictionaryShared::allocate_shared_protection_domain_array(int size, TRAPS) {
882 if (_shared_protection_domains == NULL) {
883 _shared_protection_domains = oopFactory::new_objArray(
884 SystemDictionary::ProtectionDomain_klass(), size, CHECK);
885 }
886 }
887
888 void SystemDictionaryShared::allocate_shared_jar_url_array(int size, TRAPS) {
889 if (_shared_jar_urls == NULL) {
890 _shared_jar_urls = oopFactory::new_objArray(
891 SystemDictionary::URL_klass(), size, CHECK);
892 }
893 }
894
895 void SystemDictionaryShared::allocate_shared_jar_manifest_array(int size, TRAPS) {
896 if (_shared_jar_manifests == NULL) {
897 _shared_jar_manifests = oopFactory::new_objArray(
898 SystemDictionary::Jar_Manifest_klass(), size, CHECK);
899 }
900 }
901
902 void SystemDictionaryShared::allocate_shared_data_arrays(int size, TRAPS) {
903 allocate_shared_protection_domain_array(size, CHECK);
904 allocate_shared_jar_url_array(size, CHECK);
905 allocate_shared_jar_manifest_array(size, CHECK);
906 }
907
908 // This function is called for loading only UNREGISTERED classes
909 InstanceKlass* SystemDictionaryShared::lookup_from_stream(Symbol* class_name,
910 Handle class_loader,
911 Handle protection_domain,
912 const ClassFileStream* cfs,
913 TRAPS) {
914 if (!UseSharedSpaces) {
915 return NULL;
916 }
917 if (class_name == NULL) { // don't do this for anonymous classes
918 return NULL;
919 }
920 if (class_loader.is_null() ||
921 SystemDictionary::is_system_class_loader(class_loader()) ||
922 SystemDictionary::is_platform_class_loader(class_loader())) {
923 // Do nothing for the BUILTIN loaders.
924 return NULL;
925 }
926
927 const RunTimeSharedClassInfo* record = find_record(&_unregistered_dictionary, &_dynamic_unregistered_dictionary, class_name);
928 if (record == NULL) {
929 return NULL;
930 }
931
932 int clsfile_size = cfs->length();
933 int clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length());
934
935 if (!record->matches(clsfile_size, clsfile_crc32)) {
936 return NULL;
937 }
938
939 return acquire_class_for_current_thread(record->_klass, class_loader,
940 protection_domain, cfs,
941 THREAD);
942 }
943
944 InstanceKlass* SystemDictionaryShared::acquire_class_for_current_thread(
945 InstanceKlass *ik,
946 Handle class_loader,
947 Handle protection_domain,
948 const ClassFileStream *cfs,
949 TRAPS) {
950 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader());
951
952 {
953 MutexLocker mu(THREAD, SharedDictionary_lock);
954 if (ik->class_loader_data() != NULL) {
955 // ik is already loaded (by this loader or by a different loader)
956 // or ik is being loaded by a different thread (by this loader or by a different loader)
957 return NULL;
958 }
959
960 // No other thread has acquired this yet, so give it to *this thread*
961 ik->set_class_loader_data(loader_data);
962 }
963
964 // No longer holding SharedDictionary_lock
965 // No need to lock, as <ik> can be held only by a single thread.
966 loader_data->add_class(ik);
967
968 // Get the package entry.
969 PackageEntry* pkg_entry = get_package_entry_from_class_name(class_loader, ik->name());
970
971 // Load and check super/interfaces, restore unsharable info
972 InstanceKlass* shared_klass = load_shared_class(ik, class_loader, protection_domain,
973 cfs, pkg_entry, THREAD);
974 if (shared_klass == NULL || HAS_PENDING_EXCEPTION) {
975 // TODO: clean up <ik> so it can be used again
976 return NULL;
977 }
978
979 return shared_klass;
980 }
981
982 static ResourceHashtable<
983 Symbol*, bool,
984 primitive_hash<Symbol*>,
985 primitive_equals<Symbol*>,
986 6661, // prime number
987 ResourceObj::C_HEAP> _loaded_unregistered_classes;
988
989 bool SystemDictionaryShared::add_unregistered_class(InstanceKlass* k, TRAPS) {
990 assert(DumpSharedSpaces, "only when dumping");
991
992 Symbol* name = k->name();
993 if (_loaded_unregistered_classes.get(name) != NULL) {
994 // We don't allow duplicated unregistered classes of the same name.
995 return false;
996 } else {
997 bool isnew = _loaded_unregistered_classes.put(name, true);
998 assert(isnew, "sanity");
999 MutexLocker mu_r(THREAD, Compile_lock); // add_to_hierarchy asserts this.
1000 SystemDictionary::add_to_hierarchy(k, CHECK_false);
1001 return true;
1002 }
1003 }
1004
1005 // This function is called to resolve the super/interfaces of shared classes for
1006 // non-built-in loaders. E.g., ChildClass in the below example
1007 // where "super:" (and optionally "interface:") have been specified.
1008 //
1009 // java/lang/Object id: 0
1010 // Interface id: 2 super: 0 source: cust.jar
1011 // ChildClass id: 4 super: 0 interfaces: 2 source: cust.jar
1012 InstanceKlass* SystemDictionaryShared::dump_time_resolve_super_or_fail(
1013 Symbol* child_name, Symbol* class_name, Handle class_loader,
1014 Handle protection_domain, bool is_superclass, TRAPS) {
1015
1016 assert(DumpSharedSpaces, "only when dumping");
1017
1018 ClassListParser* parser = ClassListParser::instance();
1019 if (parser == NULL) {
1020 // We're still loading the well-known classes, before the ClassListParser is created.
1021 return NULL;
1022 }
1023 if (child_name->equals(parser->current_class_name())) {
1024 // When this function is called, all the numbered super and interface types
1025 // must have already been loaded. Hence this function is never recursively called.
1026 if (is_superclass) {
1027 return parser->lookup_super_for_current_class(class_name);
1028 } else {
1029 return parser->lookup_interface_for_current_class(class_name);
1030 }
1031 } else {
1032 // The VM is not trying to resolve a super type of parser->current_class_name().
1033 // Instead, it's resolving an error class (because parser->current_class_name() has
1034 // failed parsing or verification). Don't do anything here.
1035 return NULL;
1036 }
1037 }
1038
1039 DumpTimeSharedClassInfo* SystemDictionaryShared::find_or_allocate_info_for(InstanceKlass* k) {
1040 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
1041 if (_dumptime_table == NULL) {
1042 _dumptime_table = new (ResourceObj::C_HEAP, mtClass)DumpTimeSharedClassTable();
1043 }
1044 return _dumptime_table->find_or_allocate_info_for(k);
1045 }
1046
1047 void SystemDictionaryShared::set_shared_class_misc_info(InstanceKlass* k, ClassFileStream* cfs) {
1048 Arguments::assert_is_dumping_archive();
1049 assert(!is_builtin(k), "must be unregistered class");
1050 DumpTimeSharedClassInfo* info = find_or_allocate_info_for(k);
1051 info->_clsfile_size = cfs->length();
1052 info->_clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length());
1053 }
1054
1055 void SystemDictionaryShared::init_dumptime_info(InstanceKlass* k) {
1056 (void)find_or_allocate_info_for(k);
1057 }
1058
1059 void SystemDictionaryShared::remove_dumptime_info(InstanceKlass* k) {
1060 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag);
1061 DumpTimeSharedClassInfo* p = _dumptime_table->get(k);
1062 if (p == NULL) {
1063 return;
1064 }
1065 if (p->_verifier_constraints != NULL) {
1066 for (int i = 0; i < p->_verifier_constraints->length(); i++) {
1067 DumpTimeSharedClassInfo::DTConstraint constraint = p->_verifier_constraints->at(i);
1068 if (constraint._name != NULL ) {
1069 constraint._name->decrement_refcount();
1070 }
1071 if (constraint._from_name != NULL ) {
1072 constraint._from_name->decrement_refcount();
1073 }
1074 }
1075 FREE_C_HEAP_ARRAY(DTConstraint, p->_verifier_constraints);
1076 p->_verifier_constraints = NULL;
1077 }
1078 FREE_C_HEAP_ARRAY(char, p->_verifier_constraint_flags);
1079 p->_verifier_constraint_flags = NULL;
1080 _dumptime_table->remove(k);
1081 }
1082
1083 bool SystemDictionaryShared::is_jfr_event_class(InstanceKlass *k) {
1084 while (k) {
1085 if (k->name()->equals("jdk/internal/event/Event")) {
1086 return true;
1087 }
1088 k = k->java_super();
1089 }
1090 return false;
1091 }
1092
1093 void SystemDictionaryShared::warn_excluded(InstanceKlass* k, const char* reason) {
1094 ResourceMark rm;
1095 log_warning(cds)("Skipping %s: %s", k->name()->as_C_string(), reason);
1096 }
1097
1098 bool SystemDictionaryShared::should_be_excluded(InstanceKlass* k) {
1099 if (k->class_loader_data()->is_unsafe_anonymous()) {
1100 warn_excluded(k, "Unsafe anonymous class");
1101 return true; // unsafe anonymous classes are not archived, skip
1102 }
1103 if (k->is_in_error_state()) {
1104 warn_excluded(k, "In error state");
1105 return true;
1106 }
1107 if (k->has_been_redefined()) {
1108 warn_excluded(k, "Has been redefined");
1109 return true;
1110 }
1111 if (k->shared_classpath_index() < 0 && is_builtin(k)) {
1112 // These are classes loaded from unsupported locations (such as those loaded by JVMTI native
1113 // agent during dump time).
1114 warn_excluded(k, "Unsupported location");
1115 return true;
1116 }
1117 if (k->signers() != NULL) {
1118 // We cannot include signed classes in the archive because the certificates
1119 // used during dump time may be different than those used during
1120 // runtime (due to expiration, etc).
1121 warn_excluded(k, "Signed JAR");
1122 return true;
1123 }
1124 if (is_jfr_event_class(k)) {
1125 // We cannot include JFR event classes because they need runtime-specific
1126 // instrumentation in order to work with -XX:FlightRecorderOptions=retransform=false.
1127 // There are only a small number of these classes, so it's not worthwhile to
1128 // support them and make CDS more complicated.
1129 warn_excluded(k, "JFR event class");
1130 return true;
1131 }
1132 if (k->init_state() < InstanceKlass::linked) {
1133 // In CDS dumping, we will attempt to link all classes. Those that fail to link will
1134 // be recorded in DumpTimeSharedClassInfo.
1135 Arguments::assert_is_dumping_archive();
1136
1137 // TODO -- rethink how this can be handled.
1138 // We should try to link ik, however, we can't do it here because
1139 // 1. We are at VM exit
1140 // 2. linking a class may cause other classes to be loaded, which means
1141 // a custom ClassLoader.loadClass() may be called, at a point where the
1142 // class loader doesn't expect it.
1143 if (has_class_failed_verification(k)) {
1144 warn_excluded(k, "Failed verification");
1145 } else {
1146 warn_excluded(k, "Not linked");
1147 }
1148 return true;
1149 }
1150 if (k->major_version() < 50 /*JAVA_6_VERSION*/) {
1151 ResourceMark rm;
1152 log_warning(cds)("Pre JDK 6 class not supported by CDS: %u.%u %s",
1153 k->major_version(), k->minor_version(), k->name()->as_C_string());
1154 return true;
1155 }
1156
1157 InstanceKlass* super = k->java_super();
1158 if (super != NULL && should_be_excluded(super)) {
1159 ResourceMark rm;
1160 log_warning(cds)("Skipping %s: super class %s is excluded", k->name()->as_C_string(), super->name()->as_C_string());
1161 return true;
1162 }
1163
1164 Array<InstanceKlass*>* interfaces = k->local_interfaces();
1165 int len = interfaces->length();
1166 for (int i = 0; i < len; i++) {
1167 InstanceKlass* intf = interfaces->at(i);
1168 if (should_be_excluded(intf)) {
1169 log_warning(cds)("Skipping %s: interface %s is excluded", k->name()->as_C_string(), intf->name()->as_C_string());
1170 return true;
1171 }
1172 }
1173
1174 return false;
1175 }
1176
1177 // k is a class before relocating by ArchiveCompactor
1178 void SystemDictionaryShared::validate_before_archiving(InstanceKlass* k) {
1179 ResourceMark rm;
1180 const char* name = k->name()->as_C_string();
1181 DumpTimeSharedClassInfo* info = _dumptime_table->get(k);
1182 assert(_no_class_loading_should_happen, "class loading must be disabled");
1183 guarantee(info != NULL, "Class %s must be entered into _dumptime_table", name);
1184 guarantee(!info->is_excluded(), "Should not attempt to archive excluded class %s", name);
1185 if (is_builtin(k)) {
1186 guarantee(!k->is_shared_unregistered_class(),
1187 "Class loader type must be set for BUILTIN class %s", name);
1188 } else {
1189 guarantee(k->is_shared_unregistered_class(),
1190 "Class loader type must not be set for UNREGISTERED class %s", name);
1191 }
1192 }
1193
1194 class ExcludeDumpTimeSharedClasses : StackObj {
1195 public:
1196 bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) {
1197 if (SystemDictionaryShared::should_be_excluded(k)) {
1198 info.set_excluded();
1199 }
1200 return true; // keep on iterating
1201 }
1202 };
1203
1204 void SystemDictionaryShared::check_excluded_classes() {
1205 ExcludeDumpTimeSharedClasses excl;
1206 _dumptime_table->iterate(&excl);
1207 _dumptime_table->update_counts();
1208 }
1209
1210 bool SystemDictionaryShared::is_excluded_class(InstanceKlass* k) {
1211 assert(_no_class_loading_should_happen, "sanity");
1212 Arguments::assert_is_dumping_archive();
1213 return find_or_allocate_info_for(k)->is_excluded();
1214 }
1215
1216 void SystemDictionaryShared::set_class_has_failed_verification(InstanceKlass* ik) {
1217 Arguments::assert_is_dumping_archive();
1218 find_or_allocate_info_for(ik)->set_failed_verification();
1219 }
1220
1221 bool SystemDictionaryShared::has_class_failed_verification(InstanceKlass* ik) {
1222 Arguments::assert_is_dumping_archive();
1223 if (_dumptime_table == NULL) {
1224 assert(DynamicDumpSharedSpaces, "sanity");
1225 assert(ik->is_shared(), "must be a shared class in the static archive");
1226 return false;
1227 }
1228 DumpTimeSharedClassInfo* p = _dumptime_table->get(ik);
1229 return (p == NULL) ? false : p->failed_verification();
1230 }
1231
1232 class IterateDumpTimeSharedClassTable : StackObj {
1233 MetaspaceClosure *_it;
1234 public:
1235 IterateDumpTimeSharedClassTable(MetaspaceClosure* it) : _it(it) {}
1236
1237 bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) {
1238 if (!info.is_excluded()) {
1239 info.metaspace_pointers_do(_it);
1240 }
1241 return true; // keep on iterating
1242 }
1243 };
1244
1245 void SystemDictionaryShared::dumptime_classes_do(class MetaspaceClosure* it) {
1246 IterateDumpTimeSharedClassTable iter(it);
1247 _dumptime_table->iterate(&iter);
1248 }
1249
1250 bool SystemDictionaryShared::add_verification_constraint(InstanceKlass* k, Symbol* name,
1251 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object) {
1252 Arguments::assert_is_dumping_archive();
1253 DumpTimeSharedClassInfo* info = find_or_allocate_info_for(k);
1254 info->add_verification_constraint(k, name, from_name, from_field_is_protected,
1255 from_is_array, from_is_object);
1256
1257 if (DynamicDumpSharedSpaces) {
1258 // For dynamic dumping, we can resolve all the constraint classes for all class loaders during
1259 // the initial run prior to creating the archive before vm exit. We will also perform verification
1260 // check when running with the archive.
1261 return false;
1262 } else {
1263 if (is_builtin(k)) {
1264 // For builtin class loaders, we can try to complete the verification check at dump time,
1265 // because we can resolve all the constraint classes. We will also perform verification check
1266 // when running with the archive.
1267 return false;
1268 } else {
1269 // For non-builtin class loaders, we cannot complete the verification check at dump time,
1270 // because at dump time we don't know how to resolve classes for such loaders.
1271 return true;
1272 }
1273 }
1274 }
1275
1276 void DumpTimeSharedClassInfo::add_verification_constraint(InstanceKlass* k, Symbol* name,
1277 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object) {
1278 if (_verifier_constraints == NULL) {
1279 _verifier_constraints = new(ResourceObj::C_HEAP, mtClass) GrowableArray<DTConstraint>(4, true, mtClass);
1280 }
1281 if (_verifier_constraint_flags == NULL) {
1282 _verifier_constraint_flags = new(ResourceObj::C_HEAP, mtClass) GrowableArray<char>(4, true, mtClass);
1283 }
1284 GrowableArray<DTConstraint>* vc_array = _verifier_constraints;
1285 for (int i = 0; i < vc_array->length(); i++) {
1286 DTConstraint* p = vc_array->adr_at(i);
1287 if (name == p->_name && from_name == p->_from_name) {
1288 return;
1289 }
1290 }
1291 DTConstraint cons(name, from_name);
1292 vc_array->append(cons);
1293
1294 GrowableArray<char>* vcflags_array = _verifier_constraint_flags;
1295 char c = 0;
1296 c |= from_field_is_protected ? SystemDictionaryShared::FROM_FIELD_IS_PROTECTED : 0;
1297 c |= from_is_array ? SystemDictionaryShared::FROM_IS_ARRAY : 0;
1298 c |= from_is_object ? SystemDictionaryShared::FROM_IS_OBJECT : 0;
1299 vcflags_array->append(c);
1300
1301 if (log_is_enabled(Trace, cds, verification)) {
1302 ResourceMark rm;
1303 log_trace(cds, verification)("add_verification_constraint: %s: %s must be subclass of %s [0x%x]",
1304 k->external_name(), from_name->as_klass_external_name(),
1305 name->as_klass_external_name(), c);
1306 }
1307 }
1308
1309 void SystemDictionaryShared::check_verification_constraints(InstanceKlass* klass,
1310 TRAPS) {
1311 assert(!DumpSharedSpaces && UseSharedSpaces, "called at run time with CDS enabled only");
1312 RunTimeSharedClassInfo* record = RunTimeSharedClassInfo::get_for(klass);
1313
1314 int length = record->_num_constraints;
1315 if (length > 0) {
1316 for (int i = 0; i < length; i++) {
1317 Symbol* name = record->get_constraint_name(i);
1318 Symbol* from_name = record->get_constraint_from_name(i);
1319 char c = record->get_constraint_flag(i);
1320
1321 if (log_is_enabled(Trace, cds, verification)) {
1322 ResourceMark rm(THREAD);
1323 log_trace(cds, verification)("check_verification_constraint: %s: %s must be subclass of %s [0x%x]",
1324 klass->external_name(), from_name->as_klass_external_name(),
1325 name->as_klass_external_name(), c);
1326 }
1327
1328 bool from_field_is_protected = (c & SystemDictionaryShared::FROM_FIELD_IS_PROTECTED) ? true : false;
1329 bool from_is_array = (c & SystemDictionaryShared::FROM_IS_ARRAY) ? true : false;
1330 bool from_is_object = (c & SystemDictionaryShared::FROM_IS_OBJECT) ? true : false;
1331
1332 bool ok = VerificationType::resolve_and_check_assignability(klass, name,
1333 from_name, from_field_is_protected, from_is_array, from_is_object, CHECK);
1334 if (!ok) {
1335 ResourceMark rm(THREAD);
1336 stringStream ss;
1337
1338 ss.print_cr("Bad type on operand stack");
1339 ss.print_cr("Exception Details:");
1340 ss.print_cr(" Location:\n %s", klass->name()->as_C_string());
1341 ss.print_cr(" Reason:\n Type '%s' is not assignable to '%s'",
1342 from_name->as_quoted_ascii(), name->as_quoted_ascii());
1343 THROW_MSG(vmSymbols::java_lang_VerifyError(), ss.as_string());
1344 }
1345 }
1346 }
1347 }
1348
1349 class EstimateSizeForArchive : StackObj {
1350 size_t _shared_class_info_size;
1351 int _num_builtin_klasses;
1352 int _num_unregistered_klasses;
1353
1354 public:
1355 EstimateSizeForArchive() {
1356 _shared_class_info_size = 0;
1357 _num_builtin_klasses = 0;
1358 _num_unregistered_klasses = 0;
1359 }
1360
1361 bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) {
1362 if (!info.is_excluded()) {
1363 size_t byte_size = RunTimeSharedClassInfo::byte_size(info._klass, info.num_constraints());
1364 _shared_class_info_size += align_up(byte_size, BytesPerWord);
1365 }
1366 return true; // keep on iterating
1367 }
1368
1369 size_t total() {
1370 return _shared_class_info_size;
1371 }
1372 };
1373
1374 size_t SystemDictionaryShared::estimate_size_for_archive() {
1375 EstimateSizeForArchive est;
1376 _dumptime_table->iterate(&est);
1377 return est.total() +
1378 CompactHashtableWriter::estimate_size(_dumptime_table->count_of(true)) +
1379 CompactHashtableWriter::estimate_size(_dumptime_table->count_of(false));
1380 }
1381
1382 class CopySharedClassInfoToArchive : StackObj {
1383 CompactHashtableWriter* _writer;
1384 bool _is_builtin;
1385 public:
1386 CopySharedClassInfoToArchive(CompactHashtableWriter* writer,
1387 bool is_builtin,
1388 bool is_static_archive)
1389 : _writer(writer), _is_builtin(is_builtin) {}
1390
1391 bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) {
1392 if (!info.is_excluded() && info.is_builtin() == _is_builtin) {
1393 size_t byte_size = RunTimeSharedClassInfo::byte_size(info._klass, info.num_constraints());
1394 RunTimeSharedClassInfo* record;
1395 record = (RunTimeSharedClassInfo*)MetaspaceShared::read_only_space_alloc(byte_size);
1396 record->init(info);
1397
1398 unsigned int hash;
1399 Symbol* name = info._klass->name();
1400 if (DynamicDumpSharedSpaces) {
1401 name = DynamicArchive::original_to_target(name);
1402 }
1403 hash = SystemDictionaryShared::hash_for_shared_dictionary(name);
1404 u4 delta;
1405 if (DynamicDumpSharedSpaces) {
1406 delta = MetaspaceShared::object_delta_u4(DynamicArchive::buffer_to_target(record));
1407 } else {
1408 delta = MetaspaceShared::object_delta_u4(record);
1409 }
1410 _writer->add(hash, delta);
1411 if (log_is_enabled(Trace, cds, hashtables)) {
1412 ResourceMark rm;
1413 log_trace(cds,hashtables)("%s dictionary: %s", (_is_builtin ? "builtin" : "unregistered"), info._klass->external_name());
1414 }
1415
1416 // Save this for quick runtime lookup of InstanceKlass* -> RunTimeSharedClassInfo*
1417 RunTimeSharedClassInfo::set_for(info._klass, record);
1418 }
1419 return true; // keep on iterating
1420 }
1421 };
1422
1423 void SystemDictionaryShared::write_dictionary(RunTimeSharedDictionary* dictionary,
1424 bool is_builtin,
1425 bool is_static_archive) {
1426 CompactHashtableStats stats;
1427 dictionary->reset();
1428 CompactHashtableWriter writer(_dumptime_table->count_of(is_builtin), &stats);
1429 CopySharedClassInfoToArchive copy(&writer, is_builtin, is_static_archive);
1430 _dumptime_table->iterate(©);
1431 writer.dump(dictionary, is_builtin ? "builtin dictionary" : "unregistered dictionary");
1432 }
1433
1434 void SystemDictionaryShared::write_to_archive(bool is_static_archive) {
1435 if (is_static_archive) {
1436 write_dictionary(&_builtin_dictionary, true);
1437 write_dictionary(&_unregistered_dictionary, false);
1438 } else {
1439 write_dictionary(&_dynamic_builtin_dictionary, true);
1440 write_dictionary(&_dynamic_unregistered_dictionary, false);
1441 }
1442 }
1443
1444 void SystemDictionaryShared::serialize_dictionary_headers(SerializeClosure* soc,
1445 bool is_static_archive) {
1446 if (is_static_archive) {
1447 _builtin_dictionary.serialize_header(soc);
1448 _unregistered_dictionary.serialize_header(soc);
1449 } else {
1450 _dynamic_builtin_dictionary.serialize_header(soc);
1451 _dynamic_unregistered_dictionary.serialize_header(soc);
1452 }
1453 }
1454
1455 void SystemDictionaryShared::serialize_well_known_klasses(SerializeClosure* soc) {
1456 for (int i = FIRST_WKID; i < WKID_LIMIT; i++) {
1457 soc->do_ptr((void**)&_well_known_klasses[i]);
1458 }
1459 }
1460
1461 const RunTimeSharedClassInfo*
1462 SystemDictionaryShared::find_record(RunTimeSharedDictionary* static_dict, RunTimeSharedDictionary* dynamic_dict, Symbol* name) {
1463 if (!UseSharedSpaces || !name->is_shared()) {
1464 // The names of all shared classes must also be a shared Symbol.
1465 return NULL;
1466 }
1467
1468 unsigned int hash = SystemDictionaryShared::hash_for_shared_dictionary(name);
1469 const RunTimeSharedClassInfo* record = NULL;
1470 if (!MetaspaceShared::is_shared_dynamic(name)) {
1471 // The names of all shared classes in the static dict must also be in the
1472 // static archive
1473 record = static_dict->lookup(name, hash, 0);
1474 }
1475
1476 if (record == NULL && DynamicArchive::is_mapped()) {
1477 record = dynamic_dict->lookup(name, hash, 0);
1478 }
1479
1480 return record;
1481 }
1482
1483 InstanceKlass* SystemDictionaryShared::find_builtin_class(Symbol* name) {
1484 const RunTimeSharedClassInfo* record = find_record(&_builtin_dictionary, &_dynamic_builtin_dictionary, name);
1485 if (record != NULL) {
1486 return record->_klass;
1487 } else {
1488 return NULL;
1489 }
1490 }
1491
1492 void SystemDictionaryShared::update_shared_entry(InstanceKlass* k, int id) {
1493 assert(DumpSharedSpaces, "supported only when dumping");
1494 DumpTimeSharedClassInfo* info = find_or_allocate_info_for(k);
1495 info->_id = id;
1496 }
1497
1498 class SharedDictionaryPrinter : StackObj {
1499 outputStream* _st;
1500 int _index;
1501 public:
1502 SharedDictionaryPrinter(outputStream* st) : _st(st), _index(0) {}
1503
1504 void do_value(const RunTimeSharedClassInfo* record) {
1505 ResourceMark rm;
1506 _st->print_cr("%4d: %s", (_index++), record->_klass->external_name());
1507 }
1508 };
1509
1510 void SystemDictionaryShared::print_on(outputStream* st) {
1511 if (UseSharedSpaces) {
1512 st->print_cr("Shared Dictionary");
1513 SharedDictionaryPrinter p(st);
1514 _builtin_dictionary.iterate(&p);
1515 _unregistered_dictionary.iterate(&p);
1516 if (DynamicArchive::is_mapped()) {
1517 _dynamic_builtin_dictionary.iterate(&p);
1518 _unregistered_dictionary.iterate(&p);
1519 }
1520 }
1521 }
1522
1523 void SystemDictionaryShared::print_table_statistics(outputStream* st) {
1524 if (UseSharedSpaces) {
1525 _builtin_dictionary.print_table_statistics(st, "Builtin Shared Dictionary");
1526 _unregistered_dictionary.print_table_statistics(st, "Unregistered Shared Dictionary");
1527 if (DynamicArchive::is_mapped()) {
1528 _dynamic_builtin_dictionary.print_table_statistics(st, "Dynamic Builtin Shared Dictionary");
1529 _dynamic_unregistered_dictionary.print_table_statistics(st, "Unregistered Shared Dictionary");
1530 }
1531 }
1532 }
1533
1534 bool SystemDictionaryShared::empty_dumptime_table() {
1535 if (_dumptime_table == NULL) {
1536 return true;
1537 }
1538 _dumptime_table->update_counts();
1539 if (_dumptime_table->count_of(true) == 0 && _dumptime_table->count_of(false) == 0){
1540 return true;
1541 }
1542 return false;
1543 }