1 /*
2 * Copyright (c) 2014, 2019, 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/filemap.hpp"
42 #include "memory/metadataFactory.hpp"
43 #include "memory/metaspaceClosure.hpp"
44 #include "memory/oopFactory.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "oops/instanceKlass.hpp"
47 #include "oops/klass.inline.hpp"
48 #include "oops/objArrayOop.inline.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "oops/typeArrayOop.inline.hpp"
51 #include "runtime/handles.inline.hpp"
52 #include "runtime/java.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/mutexLocker.hpp"
55 #include "utilities/hashtable.inline.hpp"
56 #include "utilities/resourceHash.hpp"
57 #include "utilities/stringUtils.hpp"
58
59
60 objArrayOop SystemDictionaryShared::_shared_protection_domains = NULL;
61 objArrayOop SystemDictionaryShared::_shared_jar_urls = NULL;
62 objArrayOop SystemDictionaryShared::_shared_jar_manifests = NULL;
63 DEBUG_ONLY(bool SystemDictionaryShared::_checked_excluded_classes = false;)
64
65 class DumpTimeSharedClassInfo: public CHeapObj<mtClass> {
66 public:
67 struct DTConstraint {
68 Symbol* _name;
69 Symbol* _from_name;
70 DTConstraint() : _name(NULL), _from_name(NULL) {}
71 DTConstraint(Symbol* n, Symbol* fn) : _name(n), _from_name(fn) {}
72 };
73
74 InstanceKlass* _klass;
75 int _id;
76 int _clsfile_size;
77 int _clsfile_crc32;
78 bool _excluded;
79 GrowableArray<DTConstraint>* _verifier_constraints;
80 GrowableArray<char>* _verifier_constraint_flags;
81
82 DumpTimeSharedClassInfo() {
83 _klass = NULL;
84 _id = -1;
85 _clsfile_size = -1;
86 _clsfile_crc32 = -1;
87 _excluded = false;
88 _verifier_constraints = NULL;
89 _verifier_constraint_flags = NULL;
90 }
91
92 void add_verification_constraint(InstanceKlass* k, Symbol* name,
93 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object);
94
95 bool is_builtin() {
96 return SystemDictionaryShared::is_builtin(_klass);
97 }
98
99 int num_constraints() {
100 if (_verifier_constraint_flags != NULL) {
101 return _verifier_constraint_flags->length();
102 } else {
103 return 0;
104 }
105 }
106
107 void metaspace_pointers_do(MetaspaceClosure* it) {
108 it->push(&_klass);
109 if (_verifier_constraints != NULL) {
110 for (int i = 0; i < _verifier_constraints->length(); i++) {
111 DTConstraint* cons = _verifier_constraints->adr_at(i);
112 it->push(&cons->_name);
113 it->push(&cons->_from_name);
114 }
115 }
116 }
117 };
118
119 class DumpTimeSharedClassTable: public ResourceHashtable<
120 InstanceKlass*,
121 DumpTimeSharedClassInfo,
122 primitive_hash<InstanceKlass*>,
123 primitive_equals<InstanceKlass*>,
124 15889, // prime number
125 ResourceObj::C_HEAP>
126 {
127 int _builtin_count;
128 int _unregistered_count;
129 public:
130 DumpTimeSharedClassInfo* find_or_allocate_info_for(InstanceKlass* k) {
131 DumpTimeSharedClassInfo* p = get(k);
132 if (p == NULL) {
133 assert(!SystemDictionaryShared::checked_excluded_classes(),
134 "no new classes can be added after check_excluded_classes");
135 put(k, DumpTimeSharedClassInfo());
136 p = get(k);
137 assert(p != NULL, "sanity");
138 p->_klass = k;
139 }
140 return p;
141 }
142
143 class CountClassByCategory : StackObj {
144 DumpTimeSharedClassTable* _table;
145 public:
146 CountClassByCategory(DumpTimeSharedClassTable* table) : _table(table) {}
147 bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) {
148 if (SystemDictionaryShared::is_builtin(k)) {
149 ++ _table->_builtin_count;
150 } else {
151 ++ _table->_unregistered_count;
152 }
153 return true; // keep on iterating
154 }
155 };
156
157 void update_counts() {
158 CountClassByCategory counter(this);
159 iterate(&counter);
160 }
161
162 int count_of(bool is_builtin) const {
163 if (is_builtin) {
164 return _builtin_count;
165 } else {
166 return _unregistered_count;
167 }
168 }
169 };
170
171 class RunTimeSharedClassInfo {
172 public:
173 struct CrcInfo {
174 int _clsfile_size;
175 int _clsfile_crc32;
176 };
177
178 // This is different than DumpTimeSharedClassInfo::DTConstraint. We use
179 // u4 instead of Symbol* to save space on 64-bit CPU.
180 struct RTConstraint {
181 u4 _name;
182 u4 _from_name;
183 };
184
185 InstanceKlass* _klass;
186 int _num_constraints;
187
188 // optional CrcInfo _crc; (only for UNREGISTERED classes)
189 // optional RTConstraint _verifier_constraints[_num_constraints]
190 // optional char _verifier_constraint_flags[_num_constraints]
191
192 private:
193 static size_t header_size_size() {
194 return sizeof(RunTimeSharedClassInfo);
195 }
196 static size_t crc_size(InstanceKlass* klass) {
197 if (!SystemDictionaryShared::is_builtin(klass)) {
198 return sizeof(CrcInfo);
199 } else {
200 return 0;
201 }
202 }
203 static size_t verifier_constraints_size(int num_constraints) {
204 return sizeof(RTConstraint) * num_constraints;
205 }
206 static size_t verifier_constraint_flags_size(int num_constraints) {
207 return sizeof(char) * num_constraints;
208 }
209
210 public:
211 static size_t byte_size(InstanceKlass* klass, int num_constraints) {
212 return header_size_size() +
213 crc_size(klass) +
214 verifier_constraints_size(num_constraints) +
215 verifier_constraint_flags_size(num_constraints);
216 }
217
218 private:
219 size_t crc_offset() const {
220 return header_size_size();
221 }
222 size_t verifier_constraints_offset() const {
223 return crc_offset() + crc_size(_klass);
224 }
225 size_t verifier_constraint_flags_offset() const {
226 return verifier_constraints_offset() + verifier_constraints_size(_num_constraints);
227 }
228
229 void check_constraint_offset(int i) const {
230 assert(0 <= i && i < _num_constraints, "sanity");
231 }
232
233 public:
234 CrcInfo* crc() const {
235 assert(crc_size(_klass) > 0, "must be");
236 return (CrcInfo*)(address(this) + crc_offset());
237 }
238 RTConstraint* verifier_constraints() {
239 assert(_num_constraints > 0, "sanity");
240 return (RTConstraint*)(address(this) + verifier_constraints_offset());
241 }
242 RTConstraint* verifier_constraint_at(int i) {
243 check_constraint_offset(i);
244 return verifier_constraints() + i;
245 }
246
247 char* verifier_constraint_flags() {
248 assert(_num_constraints > 0, "sanity");
249 return (char*)(address(this) + verifier_constraint_flags_offset());
250 }
251
252 void init(DumpTimeSharedClassInfo& info) {
253 _klass = info._klass;
254 _num_constraints = info.num_constraints();
255 if (!SystemDictionaryShared::is_builtin(_klass)) {
256 CrcInfo* c = crc();
257 c->_clsfile_size = info._clsfile_size;
258 c->_clsfile_crc32 = info._clsfile_crc32;
259 }
260 if (_num_constraints > 0) {
261 RTConstraint* constraints = verifier_constraints();
262 char* flags = verifier_constraint_flags();
263 int i;
264 for (i = 0; i < _num_constraints; i++) {
265 constraints[i]._name = MetaspaceShared::object_delta_u4(info._verifier_constraints->at(i)._name);
266 constraints[i]._from_name = MetaspaceShared::object_delta_u4(info._verifier_constraints->at(i)._from_name);
267 }
268 for (i = 0; i < _num_constraints; i++) {
269 flags[i] = info._verifier_constraint_flags->at(i);
270 }
271 }
272 }
273
274 bool matches(int clsfile_size, int clsfile_crc32) const {
275 return crc()->_clsfile_size == clsfile_size &&
276 crc()->_clsfile_crc32 == clsfile_crc32;
277 }
278
279 Symbol* get_constraint_name(int i) {
280 return (Symbol*)(SharedBaseAddress + verifier_constraint_at(i)->_name);
281 }
282 Symbol* get_constraint_from_name(int i) {
283 return (Symbol*)(SharedBaseAddress + verifier_constraint_at(i)->_from_name);
284 }
285
286 char get_constraint_flag(int i) {
287 check_constraint_offset(i);
288 return verifier_constraint_flags()[i];
289 }
290
291 private:
292 // ArchiveCompactor::allocate() has reserved a pointer immediately before
293 // archived InstanceKlasses. We can use this slot to do a quick
294 // lookup of InstanceKlass* -> RunTimeSharedClassInfo* without
295 // building a new hashtable.
296 //
297 // info_pointer_addr(klass) --> 0x0100 RunTimeSharedClassInfo*
298 // InstanceKlass* klass --> 0x0108 <C++ vtbl>
299 // 0x0110 fields from Klass ...
300 static RunTimeSharedClassInfo** info_pointer_addr(InstanceKlass* klass) {
301 return &((RunTimeSharedClassInfo**)klass)[-1];
302 }
303
304 public:
305 static RunTimeSharedClassInfo* get_for(InstanceKlass* klass) {
306 return *info_pointer_addr(klass);
307 }
308 static void set_for(InstanceKlass* klass, RunTimeSharedClassInfo* record) {
309 *info_pointer_addr(klass) = record;
310 }
311
312 // Used by RunTimeSharedDictionary to implement OffsetCompactHashtable::EQUALS
313 static inline bool EQUALS(
314 const RunTimeSharedClassInfo* value, Symbol* key, int len_unused) {
315 return (value->_klass->name() == key);
316 }
317 };
318
319 class RunTimeSharedDictionary : public OffsetCompactHashtable<
320 Symbol*,
321 const RunTimeSharedClassInfo*,
322 RunTimeSharedClassInfo::EQUALS> {};
323
324 static DumpTimeSharedClassTable* _dumptime_table = NULL;
325 static RunTimeSharedDictionary _builtin_dictionary;
326 static RunTimeSharedDictionary _unregistered_dictionary;
327
328 oop SystemDictionaryShared::shared_protection_domain(int index) {
329 return _shared_protection_domains->obj_at(index);
330 }
331
332 oop SystemDictionaryShared::shared_jar_url(int index) {
333 return _shared_jar_urls->obj_at(index);
334 }
335
336 oop SystemDictionaryShared::shared_jar_manifest(int index) {
337 return _shared_jar_manifests->obj_at(index);
338 }
339
340
341 Handle SystemDictionaryShared::get_shared_jar_manifest(int shared_path_index, TRAPS) {
342 Handle manifest ;
343 if (shared_jar_manifest(shared_path_index) == NULL) {
344 SharedClassPathEntry* ent = FileMapInfo::shared_path(shared_path_index);
345 long size = ent->manifest_size();
346 if (size <= 0) {
347 return Handle();
348 }
349
350 // ByteArrayInputStream bais = new ByteArrayInputStream(buf);
351 const char* src = ent->manifest();
352 assert(src != NULL, "No Manifest data");
353 typeArrayOop buf = oopFactory::new_byteArray(size, CHECK_NH);
354 typeArrayHandle bufhandle(THREAD, buf);
355 ArrayAccess<>::arraycopy_from_native(reinterpret_cast<const jbyte*>(src),
356 buf, typeArrayOopDesc::element_offset<jbyte>(0), size);
357
358 Handle bais = JavaCalls::construct_new_instance(SystemDictionary::ByteArrayInputStream_klass(),
359 vmSymbols::byte_array_void_signature(),
360 bufhandle, CHECK_NH);
361
362 // manifest = new Manifest(bais)
363 manifest = JavaCalls::construct_new_instance(SystemDictionary::Jar_Manifest_klass(),
364 vmSymbols::input_stream_void_signature(),
365 bais, CHECK_NH);
366 atomic_set_shared_jar_manifest(shared_path_index, manifest());
367 }
368
369 manifest = Handle(THREAD, shared_jar_manifest(shared_path_index));
370 assert(manifest.not_null(), "sanity");
371 return manifest;
372 }
373
374 Handle SystemDictionaryShared::get_shared_jar_url(int shared_path_index, TRAPS) {
375 Handle url_h;
376 if (shared_jar_url(shared_path_index) == NULL) {
377 JavaValue result(T_OBJECT);
378 const char* path = FileMapInfo::shared_path_name(shared_path_index);
379 Handle path_string = java_lang_String::create_from_str(path, CHECK_(url_h));
380 Klass* classLoaders_klass =
381 SystemDictionary::jdk_internal_loader_ClassLoaders_klass();
382 JavaCalls::call_static(&result, classLoaders_klass,
383 vmSymbols::toFileURL_name(),
384 vmSymbols::toFileURL_signature(),
385 path_string, CHECK_(url_h));
386
387 atomic_set_shared_jar_url(shared_path_index, (oop)result.get_jobject());
388 }
389
390 url_h = Handle(THREAD, shared_jar_url(shared_path_index));
391 assert(url_h.not_null(), "sanity");
392 return url_h;
393 }
394
395 Handle SystemDictionaryShared::get_package_name(Symbol* class_name, TRAPS) {
396 ResourceMark rm(THREAD);
397 Handle pkgname_string;
398 char* pkgname = (char*) ClassLoader::package_from_name((const char*) class_name->as_C_string());
399 if (pkgname != NULL) { // Package prefix found
400 StringUtils::replace_no_expand(pkgname, "/", ".");
401 pkgname_string = java_lang_String::create_from_str(pkgname,
402 CHECK_(pkgname_string));
403 }
404 return pkgname_string;
405 }
406
407 // Define Package for shared app classes from JAR file and also checks for
408 // package sealing (all done in Java code)
409 // See http://docs.oracle.com/javase/tutorial/deployment/jar/sealman.html
410 void SystemDictionaryShared::define_shared_package(Symbol* class_name,
411 Handle class_loader,
412 Handle manifest,
413 Handle url,
414 TRAPS) {
415 assert(SystemDictionary::is_system_class_loader(class_loader()), "unexpected class loader");
416 // get_package_name() returns a NULL handle if the class is in unnamed package
417 Handle pkgname_string = get_package_name(class_name, CHECK);
418 if (pkgname_string.not_null()) {
419 Klass* app_classLoader_klass = SystemDictionary::jdk_internal_loader_ClassLoaders_AppClassLoader_klass();
420 JavaValue result(T_OBJECT);
421 JavaCallArguments args(3);
422 args.set_receiver(class_loader);
423 args.push_oop(pkgname_string);
424 args.push_oop(manifest);
425 args.push_oop(url);
426 JavaCalls::call_virtual(&result, app_classLoader_klass,
427 vmSymbols::defineOrCheckPackage_name(),
428 vmSymbols::defineOrCheckPackage_signature(),
429 &args,
430 CHECK);
431 }
432 }
433
434 // Define Package for shared app/platform classes from named module
435 void SystemDictionaryShared::define_shared_package(Symbol* class_name,
436 Handle class_loader,
437 ModuleEntry* mod_entry,
438 TRAPS) {
439 assert(mod_entry != NULL, "module_entry should not be NULL");
440 Handle module_handle(THREAD, mod_entry->module());
441
442 Handle pkg_name = get_package_name(class_name, CHECK);
443 assert(pkg_name.not_null(), "Package should not be null for class in named module");
444
445 Klass* classLoader_klass;
446 if (SystemDictionary::is_system_class_loader(class_loader())) {
447 classLoader_klass = SystemDictionary::jdk_internal_loader_ClassLoaders_AppClassLoader_klass();
448 } else {
449 assert(SystemDictionary::is_platform_class_loader(class_loader()), "unexpected classloader");
450 classLoader_klass = SystemDictionary::jdk_internal_loader_ClassLoaders_PlatformClassLoader_klass();
451 }
452
453 JavaValue result(T_OBJECT);
454 JavaCallArguments args(2);
455 args.set_receiver(class_loader);
456 args.push_oop(pkg_name);
457 args.push_oop(module_handle);
458 JavaCalls::call_virtual(&result, classLoader_klass,
459 vmSymbols::definePackage_name(),
460 vmSymbols::definePackage_signature(),
461 &args,
462 CHECK);
463 }
464
465 // Get the ProtectionDomain associated with the CodeSource from the classloader.
466 Handle SystemDictionaryShared::get_protection_domain_from_classloader(Handle class_loader,
467 Handle url, TRAPS) {
468 // CodeSource cs = new CodeSource(url, null);
469 Handle cs = JavaCalls::construct_new_instance(SystemDictionary::CodeSource_klass(),
470 vmSymbols::url_code_signer_array_void_signature(),
471 url, Handle(), CHECK_NH);
472
473 // protection_domain = SecureClassLoader.getProtectionDomain(cs);
474 Klass* secureClassLoader_klass = SystemDictionary::SecureClassLoader_klass();
475 JavaValue obj_result(T_OBJECT);
476 JavaCalls::call_virtual(&obj_result, class_loader, secureClassLoader_klass,
477 vmSymbols::getProtectionDomain_name(),
478 vmSymbols::getProtectionDomain_signature(),
479 cs, CHECK_NH);
480 return Handle(THREAD, (oop)obj_result.get_jobject());
481 }
482
483 // Returns the ProtectionDomain associated with the JAR file identified by the url.
484 Handle SystemDictionaryShared::get_shared_protection_domain(Handle class_loader,
485 int shared_path_index,
486 Handle url,
487 TRAPS) {
488 Handle protection_domain;
489 if (shared_protection_domain(shared_path_index) == NULL) {
490 Handle pd = get_protection_domain_from_classloader(class_loader, url, THREAD);
491 atomic_set_shared_protection_domain(shared_path_index, pd());
492 }
493
494 // Acquire from the cache because if another thread beats the current one to
495 // set the shared protection_domain and the atomic_set fails, the current thread
496 // needs to get the updated protection_domain from the cache.
497 protection_domain = Handle(THREAD, shared_protection_domain(shared_path_index));
498 assert(protection_domain.not_null(), "sanity");
499 return protection_domain;
500 }
501
502 // Returns the ProtectionDomain associated with the moduleEntry.
503 Handle SystemDictionaryShared::get_shared_protection_domain(Handle class_loader,
504 ModuleEntry* mod, TRAPS) {
505 ClassLoaderData *loader_data = mod->loader_data();
506 if (mod->shared_protection_domain() == NULL) {
507 Symbol* location = mod->location();
508 if (location != NULL) {
509 Handle location_string = java_lang_String::create_from_symbol(
510 location, CHECK_NH);
511 Handle url;
512 JavaValue result(T_OBJECT);
513 if (location->starts_with("jrt:/")) {
514 url = JavaCalls::construct_new_instance(SystemDictionary::URL_klass(),
515 vmSymbols::string_void_signature(),
516 location_string, CHECK_NH);
517 } else {
518 Klass* classLoaders_klass =
519 SystemDictionary::jdk_internal_loader_ClassLoaders_klass();
520 JavaCalls::call_static(&result, classLoaders_klass, vmSymbols::toFileURL_name(),
521 vmSymbols::toFileURL_signature(),
522 location_string, CHECK_NH);
523 url = Handle(THREAD, (oop)result.get_jobject());
524 }
525
526 Handle pd = get_protection_domain_from_classloader(class_loader, url,
527 CHECK_NH);
528 mod->set_shared_protection_domain(loader_data, pd);
529 }
530 }
531
532 Handle protection_domain(THREAD, mod->shared_protection_domain());
533 assert(protection_domain.not_null(), "sanity");
534 return protection_domain;
535 }
536
537 // Initializes the java.lang.Package and java.security.ProtectionDomain objects associated with
538 // the given InstanceKlass.
539 // Returns the ProtectionDomain for the InstanceKlass.
540 Handle SystemDictionaryShared::init_security_info(Handle class_loader, InstanceKlass* ik, TRAPS) {
541 Handle pd;
542
543 if (ik != NULL) {
544 int index = ik->shared_classpath_index();
545 assert(index >= 0, "Sanity");
546 SharedClassPathEntry* ent = FileMapInfo::shared_path(index);
547 Symbol* class_name = ik->name();
548
549 if (ent->is_modules_image()) {
550 // For shared app/platform classes originated from the run-time image:
551 // The ProtectionDomains are cached in the corresponding ModuleEntries
552 // for fast access by the VM.
553 ResourceMark rm;
554 ClassLoaderData *loader_data =
555 ClassLoaderData::class_loader_data(class_loader());
556 PackageEntryTable* pkgEntryTable = loader_data->packages();
557 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK_(pd));
558 if (pkg_name != NULL) {
559 PackageEntry* pkg_entry = pkgEntryTable->lookup_only(pkg_name);
560 if (pkg_entry != NULL) {
561 ModuleEntry* mod_entry = pkg_entry->module();
562 pd = get_shared_protection_domain(class_loader, mod_entry, THREAD);
563 define_shared_package(class_name, class_loader, mod_entry, CHECK_(pd));
564 }
565 }
566 } else {
567 // For shared app/platform classes originated from JAR files on the class path:
568 // Each of the 3 SystemDictionaryShared::_shared_xxx arrays has the same length
569 // as the shared classpath table in the shared archive (see
570 // FileMap::_shared_path_table in filemap.hpp for details).
571 //
572 // If a shared InstanceKlass k is loaded from the class path, let
573 //
574 // index = k->shared_classpath_index():
575 //
576 // FileMap::_shared_path_table[index] identifies the JAR file that contains k.
577 //
578 // k's protection domain is:
579 //
580 // ProtectionDomain pd = _shared_protection_domains[index];
581 //
582 // and k's Package is initialized using
583 //
584 // manifest = _shared_jar_manifests[index];
585 // url = _shared_jar_urls[index];
586 // define_shared_package(class_name, class_loader, manifest, url, CHECK_(pd));
587 //
588 // Note that if an element of these 3 _shared_xxx arrays is NULL, it will be initialized by
589 // the corresponding SystemDictionaryShared::get_shared_xxx() function.
590 Handle manifest = get_shared_jar_manifest(index, CHECK_(pd));
591 Handle url = get_shared_jar_url(index, CHECK_(pd));
592 define_shared_package(class_name, class_loader, manifest, url, CHECK_(pd));
593 pd = get_shared_protection_domain(class_loader, index, url, CHECK_(pd));
594 }
595 }
596 return pd;
597 }
598
599 bool SystemDictionaryShared::is_sharing_possible(ClassLoaderData* loader_data) {
600 oop class_loader = loader_data->class_loader();
601 return (class_loader == NULL ||
602 SystemDictionary::is_system_class_loader(class_loader) ||
603 SystemDictionary::is_platform_class_loader(class_loader));
604 }
605
606 // Currently AppCDS only archives classes from the run-time image, the
607 // -Xbootclasspath/a path, the class path, and the module path.
608 //
609 // Check if a shared class can be loaded by the specific classloader. Following
610 // are the "visible" archived classes for different classloaders.
611 //
612 // NULL classloader:
613 // - see SystemDictionary::is_shared_class_visible()
614 // Platform classloader:
615 // - Module class from runtime image. ModuleEntry must be defined in the
616 // classloader.
617 // App classloader:
618 // - Module Class from runtime image and module path. ModuleEntry must be defined in the
619 // classloader.
620 // - Class from -cp. The class must have no PackageEntry defined in any of the
621 // boot/platform/app classloader, or must be in the unnamed module defined in the
622 // AppClassLoader.
623 bool SystemDictionaryShared::is_shared_class_visible_for_classloader(
624 InstanceKlass* ik,
625 Handle class_loader,
626 const char* pkg_string,
627 Symbol* pkg_name,
628 PackageEntry* pkg_entry,
629 ModuleEntry* mod_entry,
630 TRAPS) {
631 assert(class_loader.not_null(), "Class loader should not be NULL");
632 assert(Universe::is_module_initialized(), "Module system is not initialized");
633 ResourceMark rm(THREAD);
634
635 int path_index = ik->shared_classpath_index();
636 SharedClassPathEntry* ent =
637 (SharedClassPathEntry*)FileMapInfo::shared_path(path_index);
638
639 if (SystemDictionary::is_platform_class_loader(class_loader())) {
640 assert(ent != NULL, "shared class for PlatformClassLoader should have valid SharedClassPathEntry");
641 // The PlatformClassLoader can only load archived class originated from the
642 // run-time image. The class' PackageEntry/ModuleEntry must be
643 // defined by the PlatformClassLoader.
644 if (mod_entry != NULL) {
645 // PackageEntry/ModuleEntry is found in the classloader. Check if the
646 // ModuleEntry's location agrees with the archived class' origination.
647 if (ent->is_modules_image() && mod_entry->location()->starts_with("jrt:")) {
648 return true; // Module class from the runtime image
649 }
650 }
651 } else if (SystemDictionary::is_system_class_loader(class_loader())) {
652 assert(ent != NULL, "shared class for system loader should have valid SharedClassPathEntry");
653 if (pkg_string == NULL) {
654 // The archived class is in the unnamed package. Currently, the boot image
655 // does not contain any class in the unnamed package.
656 assert(!ent->is_modules_image(), "Class in the unnamed package must be from the classpath");
657 if (path_index >= ClassLoaderExt::app_class_paths_start_index()) {
658 assert(path_index < ClassLoaderExt::app_module_paths_start_index(), "invalid path_index");
659 return true;
660 }
661 } else {
662 // Check if this is from a PackageEntry/ModuleEntry defined in the AppClassloader.
663 if (pkg_entry == NULL) {
664 // It's not guaranteed that the class is from the classpath if the
665 // PackageEntry cannot be found from the AppClassloader. Need to check
666 // the boot and platform classloader as well.
667 if (get_package_entry(pkg_name, ClassLoaderData::class_loader_data_or_null(SystemDictionary::java_platform_loader())) == NULL &&
668 get_package_entry(pkg_name, ClassLoaderData::the_null_class_loader_data()) == NULL) {
669 // The PackageEntry is not defined in any of the boot/platform/app classloaders.
670 // The archived class must from -cp path and not from the runtime image.
671 if (!ent->is_modules_image() && path_index >= ClassLoaderExt::app_class_paths_start_index() &&
672 path_index < ClassLoaderExt::app_module_paths_start_index()) {
673 return true;
674 }
675 }
676 } else if (mod_entry != NULL) {
677 // The package/module is defined in the AppClassLoader. We support
678 // archiving application module class from the runtime image or from
679 // a named module from a module path.
680 // Packages from the -cp path are in the unnamed_module.
681 if (ent->is_modules_image() && mod_entry->location()->starts_with("jrt:")) {
682 // shared module class from runtime image
683 return true;
684 } else if (pkg_entry->in_unnamed_module() && path_index >= ClassLoaderExt::app_class_paths_start_index() &&
685 path_index < ClassLoaderExt::app_module_paths_start_index()) {
686 // shared class from -cp
687 DEBUG_ONLY( \
688 ClassLoaderData* loader_data = class_loader_data(class_loader); \
689 assert(mod_entry == loader_data->unnamed_module(), "the unnamed module is not defined in the classloader");)
690 return true;
691 } else {
692 if(!pkg_entry->in_unnamed_module() &&
693 (path_index >= ClassLoaderExt::app_module_paths_start_index())&&
694 (path_index < FileMapInfo::get_number_of_shared_paths()) &&
695 (strcmp(ent->name(), ClassLoader::skip_uri_protocol(mod_entry->location()->as_C_string())) == 0)) {
696 // shared module class from module path
697 return true;
698 } else {
699 assert(path_index < FileMapInfo::get_number_of_shared_paths(), "invalid path_index");
700 }
701 }
702 }
703 }
704 } else {
705 // TEMP: if a shared class can be found by a custom loader, consider it visible now.
706 // FIXME: is this actually correct?
707 return true;
708 }
709 return false;
710 }
711
712 // The following stack shows how this code is reached:
713 //
714 // [0] SystemDictionaryShared::find_or_load_shared_class()
715 // [1] JVM_FindLoadedClass
716 // [2] java.lang.ClassLoader.findLoadedClass0()
717 // [3] java.lang.ClassLoader.findLoadedClass()
718 // [4] jdk.internal.loader.BuiltinClassLoader.loadClassOrNull()
719 // [5] jdk.internal.loader.BuiltinClassLoader.loadClass()
720 // [6] jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(), or
721 // jdk.internal.loader.ClassLoaders$PlatformClassLoader.loadClass()
722 //
723 // AppCDS supports fast class loading for these 2 built-in class loaders:
724 // jdk.internal.loader.ClassLoaders$PlatformClassLoader
725 // jdk.internal.loader.ClassLoaders$AppClassLoader
726 // with the following assumptions (based on the JDK core library source code):
727 //
728 // [a] these two loaders use the BuiltinClassLoader.loadClassOrNull() to
729 // load the named class.
730 // [b] BuiltinClassLoader.loadClassOrNull() first calls findLoadedClass(name).
731 // [c] At this point, if we can find the named class inside the
732 // shared_dictionary, we can perform further checks (see
733 // is_shared_class_visible_for_classloader() to ensure that this class
734 // was loaded by the same class loader during dump time.
735 //
736 // Given these assumptions, we intercept the findLoadedClass() call to invoke
737 // SystemDictionaryShared::find_or_load_shared_class() to load the shared class from
738 // the archive for the 2 built-in class loaders. This way,
739 // we can improve start-up because we avoid decoding the classfile,
740 // and avoid delegating to the parent loader.
741 //
742 // NOTE: there's a lot of assumption about the Java code. If any of that change, this
743 // needs to be redesigned.
744
745 InstanceKlass* SystemDictionaryShared::find_or_load_shared_class(
746 Symbol* name, Handle class_loader, TRAPS) {
747 InstanceKlass* k = NULL;
748 if (UseSharedSpaces) {
749 if (!FileMapInfo::current_info()->header()->has_platform_or_app_classes()) {
750 return NULL;
751 }
752
753 if (SystemDictionary::is_system_class_loader(class_loader()) ||
754 SystemDictionary::is_platform_class_loader(class_loader())) {
755 // Fix for 4474172; see evaluation for more details
756 class_loader = Handle(
757 THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader()));
758 ClassLoaderData *loader_data = register_loader(class_loader);
759 Dictionary* dictionary = loader_data->dictionary();
760
761 unsigned int d_hash = dictionary->compute_hash(name);
762
763 bool DoObjectLock = true;
764 if (is_parallelCapable(class_loader)) {
765 DoObjectLock = false;
766 }
767
768 // Make sure we are synchronized on the class loader before we proceed
769 //
770 // Note: currently, find_or_load_shared_class is called only from
771 // JVM_FindLoadedClass and used for PlatformClassLoader and AppClassLoader,
772 // which are parallel-capable loaders, so this lock is NOT taken.
773 Handle lockObject = compute_loader_lock_object(class_loader, THREAD);
774 check_loader_lock_contention(lockObject, THREAD);
775 ObjectLocker ol(lockObject, THREAD, DoObjectLock);
776
777 {
778 MutexLocker mu(SystemDictionary_lock, THREAD);
779 InstanceKlass* check = find_class(d_hash, name, dictionary);
780 if (check != NULL) {
781 return check;
782 }
783 }
784
785 k = load_shared_class_for_builtin_loader(name, class_loader, THREAD);
786 if (k != NULL) {
787 define_instance_class(k, CHECK_NULL);
788 }
789 }
790 }
791 return k;
792 }
793
794 InstanceKlass* SystemDictionaryShared::load_shared_class_for_builtin_loader(
795 Symbol* class_name, Handle class_loader, TRAPS) {
796 assert(UseSharedSpaces, "must be");
797 InstanceKlass* ik = find_builtin_class(class_name);
798
799 if (ik != NULL) {
800 if ((ik->is_shared_app_class() &&
801 SystemDictionary::is_system_class_loader(class_loader())) ||
802 (ik->is_shared_platform_class() &&
803 SystemDictionary::is_platform_class_loader(class_loader()))) {
804 Handle protection_domain =
805 SystemDictionaryShared::init_security_info(class_loader, ik, CHECK_NULL);
806 return load_shared_class(ik, class_loader, protection_domain, NULL, THREAD);
807 }
808 }
809 return NULL;
810 }
811
812 void SystemDictionaryShared::oops_do(OopClosure* f) {
813 f->do_oop((oop*)&_shared_protection_domains);
814 f->do_oop((oop*)&_shared_jar_urls);
815 f->do_oop((oop*)&_shared_jar_manifests);
816 }
817
818 void SystemDictionaryShared::allocate_shared_protection_domain_array(int size, TRAPS) {
819 if (_shared_protection_domains == NULL) {
820 _shared_protection_domains = oopFactory::new_objArray(
821 SystemDictionary::ProtectionDomain_klass(), size, CHECK);
822 }
823 }
824
825 void SystemDictionaryShared::allocate_shared_jar_url_array(int size, TRAPS) {
826 if (_shared_jar_urls == NULL) {
827 _shared_jar_urls = oopFactory::new_objArray(
828 SystemDictionary::URL_klass(), size, CHECK);
829 }
830 }
831
832 void SystemDictionaryShared::allocate_shared_jar_manifest_array(int size, TRAPS) {
833 if (_shared_jar_manifests == NULL) {
834 _shared_jar_manifests = oopFactory::new_objArray(
835 SystemDictionary::Jar_Manifest_klass(), size, CHECK);
836 }
837 }
838
839 void SystemDictionaryShared::allocate_shared_data_arrays(int size, TRAPS) {
840 allocate_shared_protection_domain_array(size, CHECK);
841 allocate_shared_jar_url_array(size, CHECK);
842 allocate_shared_jar_manifest_array(size, CHECK);
843 }
844
845 // This function is called for loading only UNREGISTERED classes
846 InstanceKlass* SystemDictionaryShared::lookup_from_stream(Symbol* class_name,
847 Handle class_loader,
848 Handle protection_domain,
849 const ClassFileStream* cfs,
850 TRAPS) {
851 if (!UseSharedSpaces) {
852 return NULL;
853 }
854 if (class_name == NULL) { // don't do this for anonymous classes
855 return NULL;
856 }
857 if (class_loader.is_null() ||
858 SystemDictionary::is_system_class_loader(class_loader()) ||
859 SystemDictionary::is_platform_class_loader(class_loader())) {
860 // Do nothing for the BUILTIN loaders.
861 return NULL;
862 }
863
864 const RunTimeSharedClassInfo* record = find_record(&_unregistered_dictionary, class_name);
865 if (record == NULL) {
866 return NULL;
867 }
868
869 int clsfile_size = cfs->length();
870 int clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length());
871 if (!record->matches(clsfile_size, clsfile_crc32)) {
872 return NULL;
873 }
874
875 return acquire_class_for_current_thread(record->_klass, class_loader,
876 protection_domain, cfs,
877 THREAD);
878 }
879
880 InstanceKlass* SystemDictionaryShared::acquire_class_for_current_thread(
881 InstanceKlass *ik,
882 Handle class_loader,
883 Handle protection_domain,
884 const ClassFileStream *cfs,
885 TRAPS) {
886 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader());
887
888 {
889 MutexLocker mu(SharedDictionary_lock, THREAD);
890 if (ik->class_loader_data() != NULL) {
891 // ik is already loaded (by this loader or by a different loader)
892 // or ik is being loaded by a different thread (by this loader or by a different loader)
893 return NULL;
894 }
895
896 // No other thread has acquired this yet, so give it to *this thread*
897 ik->set_class_loader_data(loader_data);
898 }
899
900 // No longer holding SharedDictionary_lock
901 // No need to lock, as <ik> can be held only by a single thread.
902 loader_data->add_class(ik);
903
904 // Load and check super/interfaces, restore unsharable info
905 InstanceKlass* shared_klass = load_shared_class(ik, class_loader, protection_domain,
906 cfs, THREAD);
907 if (shared_klass == NULL || HAS_PENDING_EXCEPTION) {
908 // TODO: clean up <ik> so it can be used again
909 return NULL;
910 }
911
912 return shared_klass;
913 }
914
915 static ResourceHashtable<
916 Symbol*, bool,
917 primitive_hash<Symbol*>,
918 primitive_equals<Symbol*>,
919 6661, // prime number
920 ResourceObj::C_HEAP> _loaded_unregistered_classes;
921
922 bool SystemDictionaryShared::add_unregistered_class(InstanceKlass* k, TRAPS) {
923 assert(DumpSharedSpaces, "only when dumping");
924
925 Symbol* name = k->name();
926 if (_loaded_unregistered_classes.get(name) != NULL) {
927 // We don't allow duplicated unregistered classes of the same name.
928 return false;
929 } else {
930 bool isnew = _loaded_unregistered_classes.put(name, true);
931 assert(isnew, "sanity");
932 MutexLocker mu_r(Compile_lock, THREAD); // add_to_hierarchy asserts this.
933 SystemDictionary::add_to_hierarchy(k, CHECK_0);
934 return true;
935 }
936 }
937
938 // This function is called to resolve the super/interfaces of shared classes for
939 // non-built-in loaders. E.g., ChildClass in the below example
940 // where "super:" (and optionally "interface:") have been specified.
941 //
942 // java/lang/Object id: 0
943 // Interface id: 2 super: 0 source: cust.jar
944 // ChildClass id: 4 super: 0 interfaces: 2 source: cust.jar
945 InstanceKlass* SystemDictionaryShared::dump_time_resolve_super_or_fail(
946 Symbol* child_name, Symbol* class_name, Handle class_loader,
947 Handle protection_domain, bool is_superclass, TRAPS) {
948
949 assert(DumpSharedSpaces, "only when dumping");
950
951 ClassListParser* parser = ClassListParser::instance();
952 if (parser == NULL) {
953 // We're still loading the well-known classes, before the ClassListParser is created.
954 return NULL;
955 }
956 if (child_name->equals(parser->current_class_name())) {
957 // When this function is called, all the numbered super and interface types
958 // must have already been loaded. Hence this function is never recursively called.
959 if (is_superclass) {
960 return parser->lookup_super_for_current_class(class_name);
961 } else {
962 return parser->lookup_interface_for_current_class(class_name);
963 }
964 } else {
965 // The VM is not trying to resolve a super type of parser->current_class_name().
966 // Instead, it's resolving an error class (because parser->current_class_name() has
967 // failed parsing or verification). Don't do anything here.
968 return NULL;
969 }
970 }
971
972 DumpTimeSharedClassInfo* SystemDictionaryShared::find_or_allocate_info_for(InstanceKlass* k) {
973 if (_dumptime_table == NULL) {
974 _dumptime_table = new (ResourceObj::C_HEAP, mtClass)DumpTimeSharedClassTable();
975 }
976 return _dumptime_table->find_or_allocate_info_for(k);
977 }
978
979 void SystemDictionaryShared::set_shared_class_misc_info(InstanceKlass* k, ClassFileStream* cfs) {
980 assert(DumpSharedSpaces, "only when dumping");
981 assert(!is_builtin(k), "must be unregistered class");
982 DumpTimeSharedClassInfo* info = find_or_allocate_info_for(k);
983 info->_clsfile_size = cfs->length();
984 info->_clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length());
985 }
986
987 void SystemDictionaryShared::init_dumptime_info(InstanceKlass* k) {
988 (void)find_or_allocate_info_for(k);
989 }
990
991 void SystemDictionaryShared::remove_dumptime_info(InstanceKlass* k) {
992 _dumptime_table->remove(k);
993 }
994
995 bool SystemDictionaryShared::is_jfr_event_class(InstanceKlass *k) {
996 while (k) {
997 if (k->name()->equals("jdk/internal/event/Event")) {
998 return true;
999 }
1000 k = k->java_super();
1001 }
1002 return false;
1003 }
1004
1005 void SystemDictionaryShared::warn_excluded(InstanceKlass* k, const char* reason) {
1006 ResourceMark rm;
1007 log_warning(cds)("Skipping %s: %s", k->name()->as_C_string(), reason);
1008 }
1009
1010 bool SystemDictionaryShared::should_be_excluded(InstanceKlass* k) {
1011 if (k->class_loader_data()->is_unsafe_anonymous()) {
1012 return true; // unsafe anonymous classes are not archived, skip
1013 }
1014 if (k->is_in_error_state()) {
1015 return true;
1016 }
1017 if (k->shared_classpath_index() < 0 && is_builtin(k)) {
1018 // These are classes loaded from unsupported locations (such as those loaded by JVMTI native
1019 // agent during dump time).
1020 warn_excluded(k, "Unsupported location");
1021 return true;
1022 }
1023 if (k->signers() != NULL) {
1024 // We cannot include signed classes in the archive because the certificates
1025 // used during dump time may be different than those used during
1026 // runtime (due to expiration, etc).
1027 warn_excluded(k, "Signed JAR");
1028 return true;
1029 }
1030 if (is_jfr_event_class(k)) {
1031 // We cannot include JFR event classes because they need runtime-specific
1032 // instrumentation in order to work with -XX:FlightRecorderOptions=retransform=false.
1033 // There are only a small number of these classes, so it's not worthwhile to
1034 // support them and make CDS more complicated.
1035 warn_excluded(k, "JFR event class");
1036 return true;
1037 }
1038 return false;
1039 }
1040
1041 // k is a class before relocating by ArchiveCompactor
1042 void SystemDictionaryShared::validate_before_archiving(InstanceKlass* k) {
1043 ResourceMark rm;
1044 const char* name = k->name()->as_C_string();
1045 DumpTimeSharedClassInfo* info = _dumptime_table->get(k);
1046 guarantee(info != NULL, "Class %s must be entered into _dumptime_table", name);
1047 guarantee(!info->_excluded, "Should not attempt to archive excluded class %s", name);
1048 if (is_builtin(k)) {
1049 guarantee(k->loader_type() != 0,
1050 "Class loader type must be set for BUILTIN class %s", name);
1051 } else {
1052 guarantee(k->loader_type() == 0,
1053 "Class loader type must not be set for UNREGISTERED class %s", name);
1054 }
1055 }
1056
1057 class ExcludeDumpTimeSharedClasses : StackObj {
1058 public:
1059 bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) {
1060 if (SystemDictionaryShared::should_be_excluded(k)) {
1061 info._excluded = true;
1062 }
1063 return true; // keep on iterating
1064 }
1065 };
1066
1067 void SystemDictionaryShared::check_excluded_classes() {
1068 ExcludeDumpTimeSharedClasses excl;
1069 _dumptime_table->iterate(&excl);
1070 DEBUG_ONLY(_checked_excluded_classes = true;)
1071 }
1072
1073 bool SystemDictionaryShared::is_excluded_class(InstanceKlass* k) {
1074 assert(_checked_excluded_classes, "sanity");
1075 assert(DumpSharedSpaces, "only when dumping");
1076 return find_or_allocate_info_for(k)->_excluded;
1077 }
1078
1079 class IterateDumpTimeSharedClassTable : StackObj {
1080 MetaspaceClosure *_it;
1081 public:
1082 IterateDumpTimeSharedClassTable(MetaspaceClosure* it) : _it(it) {}
1083
1084 bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) {
1085 if (!info._excluded) {
1086 info.metaspace_pointers_do(_it);
1087 }
1088 return true; // keep on iterating
1089 }
1090 };
1091
1092 void SystemDictionaryShared::dumptime_classes_do(class MetaspaceClosure* it) {
1093 IterateDumpTimeSharedClassTable iter(it);
1094 _dumptime_table->iterate(&iter);
1095 }
1096
1097 bool SystemDictionaryShared::add_verification_constraint(InstanceKlass* k, Symbol* name,
1098 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object) {
1099 assert(DumpSharedSpaces, "called at dump time only");
1100 DumpTimeSharedClassInfo* info = find_or_allocate_info_for(k);
1101 info->add_verification_constraint(k, name, from_name, from_field_is_protected,
1102 from_is_array, from_is_object);
1103 if (is_builtin(k)) {
1104 // For builtin class loaders, we can try to complete the verification check at dump time,
1105 // because we can resolve all the constraint classes.
1106 return false;
1107 } else {
1108 // For non-builtin class loaders, we cannot complete the verification check at dump time,
1109 // because at dump time we don't know how to resolve classes for such loaders.
1110 return true;
1111 }
1112 }
1113
1114 void DumpTimeSharedClassInfo::add_verification_constraint(InstanceKlass* k, Symbol* name,
1115 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object) {
1116 if (_verifier_constraints == NULL) {
1117 _verifier_constraints = new(ResourceObj::C_HEAP, mtClass) GrowableArray<DTConstraint>(4, true, mtClass);
1118 }
1119 if (_verifier_constraint_flags == NULL) {
1120 _verifier_constraint_flags = new(ResourceObj::C_HEAP, mtClass) GrowableArray<char>(4, true, mtClass);
1121 }
1122 GrowableArray<DTConstraint>* vc_array = _verifier_constraints;
1123 for (int i = 0; i < vc_array->length(); i++) {
1124 DTConstraint* p = vc_array->adr_at(i);
1125 if (name == p->_name && from_name == p->_from_name) {
1126 return;
1127 }
1128 }
1129 DTConstraint cons(name, from_name);
1130 vc_array->append(cons);
1131
1132 GrowableArray<char>* vcflags_array = _verifier_constraint_flags;
1133 char c = 0;
1134 c |= from_field_is_protected ? SystemDictionaryShared::FROM_FIELD_IS_PROTECTED : 0;
1135 c |= from_is_array ? SystemDictionaryShared::FROM_IS_ARRAY : 0;
1136 c |= from_is_object ? SystemDictionaryShared::FROM_IS_OBJECT : 0;
1137 vcflags_array->append(c);
1138
1139 if (log_is_enabled(Trace, cds, verification)) {
1140 ResourceMark rm;
1141 log_trace(cds, verification)("add_verification_constraint: %s: %s must be subclass of %s",
1142 k->external_name(), from_name->as_klass_external_name(),
1143 name->as_klass_external_name());
1144 }
1145 }
1146
1147 void SystemDictionaryShared::check_verification_constraints(InstanceKlass* klass,
1148 TRAPS) {
1149 assert(!DumpSharedSpaces && UseSharedSpaces, "called at run time with CDS enabled only");
1150 RunTimeSharedClassInfo* record = RunTimeSharedClassInfo::get_for(klass);
1151
1152 int length = record->_num_constraints;
1153 if (length > 0) {
1154 for (int i = 0; i < length; i++) {
1155 Symbol* name = record->get_constraint_name(i);
1156 Symbol* from_name = record->get_constraint_from_name(i);
1157 char c = record->get_constraint_flag(i);
1158
1159 bool from_field_is_protected = (c & SystemDictionaryShared::FROM_FIELD_IS_PROTECTED) ? true : false;
1160 bool from_is_array = (c & SystemDictionaryShared::FROM_IS_ARRAY) ? true : false;
1161 bool from_is_object = (c & SystemDictionaryShared::FROM_IS_OBJECT) ? true : false;
1162
1163 bool ok = VerificationType::resolve_and_check_assignability(klass, name,
1164 from_name, from_field_is_protected, from_is_array, from_is_object, CHECK);
1165 if (!ok) {
1166 ResourceMark rm(THREAD);
1167 stringStream ss;
1168
1169 ss.print_cr("Bad type on operand stack");
1170 ss.print_cr("Exception Details:");
1171 ss.print_cr(" Location:\n %s", klass->name()->as_C_string());
1172 ss.print_cr(" Reason:\n Type '%s' is not assignable to '%s'",
1173 from_name->as_quoted_ascii(), name->as_quoted_ascii());
1174 THROW_MSG(vmSymbols::java_lang_VerifyError(), ss.as_string());
1175 }
1176 }
1177 }
1178 }
1179
1180 class CopySharedClassInfoToArchive : StackObj {
1181 CompactHashtableWriter* _writer;
1182 bool _is_builtin;
1183 public:
1184 CopySharedClassInfoToArchive(CompactHashtableWriter* writer, bool is_builtin)
1185 : _writer(writer), _is_builtin(is_builtin) {}
1186
1187 bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) {
1188 if (!info._excluded && info.is_builtin() == _is_builtin) {
1189 size_t byte_size = RunTimeSharedClassInfo::byte_size(info._klass, info.num_constraints());
1190 RunTimeSharedClassInfo* record =
1191 (RunTimeSharedClassInfo*)MetaspaceShared::read_only_space_alloc(byte_size);
1192 record->init(info);
1193
1194 unsigned int hash = primitive_hash<Symbol*>(info._klass->name());
1195 _writer->add(hash, MetaspaceShared::object_delta_u4(record));
1196
1197 // Save this for quick runtime lookup of InstanceKlass* -> RunTimeSharedClassInfo*
1198 RunTimeSharedClassInfo::set_for(info._klass, record);
1199 }
1200 return true; // keep on iterating
1201 }
1202 };
1203
1204 void SystemDictionaryShared::write_dictionary(RunTimeSharedDictionary* dictionary, bool is_builtin) {
1205 CompactHashtableStats stats;
1206 dictionary->reset();
1207 int num_buckets = CompactHashtableWriter::default_num_buckets(_dumptime_table->count_of(is_builtin));
1208 CompactHashtableWriter writer(num_buckets, &stats);
1209 CopySharedClassInfoToArchive copy(&writer, is_builtin);
1210 _dumptime_table->iterate(©);
1211 writer.dump(dictionary, is_builtin ? "builtin dictionary" : "unregistered dictionary");
1212 }
1213
1214 void SystemDictionaryShared::write_to_archive() {
1215 _dumptime_table->update_counts();
1216 write_dictionary(&_builtin_dictionary, true);
1217 write_dictionary(&_unregistered_dictionary, false);
1218 }
1219
1220 void SystemDictionaryShared::serialize_dictionary_headers(SerializeClosure* soc) {
1221 _builtin_dictionary.serialize_header(soc);
1222 _unregistered_dictionary.serialize_header(soc);
1223 }
1224
1225 const RunTimeSharedClassInfo*
1226 SystemDictionaryShared::find_record(RunTimeSharedDictionary* dict, Symbol* name) {
1227 if (UseSharedSpaces) {
1228 unsigned int hash = primitive_hash<Symbol*>(name);
1229 return dict->lookup(name, hash, 0);
1230 } else {
1231 return NULL;
1232 }
1233 }
1234
1235 InstanceKlass* SystemDictionaryShared::find_builtin_class(Symbol* name) {
1236 const RunTimeSharedClassInfo* record = find_record(&_builtin_dictionary, name);
1237 if (record) {
1238 return record->_klass;
1239 } else {
1240 return NULL;
1241 }
1242 }
1243
1244 void SystemDictionaryShared::update_shared_entry(InstanceKlass* k, int id) {
1245 assert(DumpSharedSpaces, "supported only when dumping");
1246 DumpTimeSharedClassInfo* info = find_or_allocate_info_for(k);
1247 info->_id = id;
1248 }
1249
1250 class SharedDictionaryPrinter : StackObj {
1251 outputStream* _st;
1252 int _index;
1253 public:
1254 SharedDictionaryPrinter(outputStream* st) : _st(st), _index(0) {}
1255
1256 void do_value(const RunTimeSharedClassInfo* record) {
1257 ResourceMark rm;
1258 _st->print_cr("%4d: %s", (_index++), record->_klass->external_name());
1259 }
1260 };
1261
1262 void SystemDictionaryShared::print_on(outputStream* st) {
1263 if (UseSharedSpaces) {
1264 st->print_cr("Shared Dictionary");
1265 SharedDictionaryPrinter p(st);
1266 _builtin_dictionary.iterate(&p);
1267 _unregistered_dictionary.iterate(&p);
1268 }
1269 }
1270
1271 void SystemDictionaryShared::print_table_statistics(outputStream* st) {
1272 if (UseSharedSpaces) {
1273 _builtin_dictionary.print_table_statistics(st, "Builtin Shared Dictionary");
1274 _unregistered_dictionary.print_table_statistics(st, "Unregistered Shared Dictionary");
1275 }
1276 }