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 "memory/universe.hpp" 47 #include "memory/dynamicArchive.hpp" 48 #include "oops/instanceKlass.hpp" 49 #include "oops/klass.inline.hpp" 50 #include "oops/objArrayOop.inline.hpp" 51 #include "oops/oop.inline.hpp" 52 #include "oops/typeArrayOop.inline.hpp" 53 #include "runtime/handles.inline.hpp" 54 #include "runtime/java.hpp" 55 #include "runtime/javaCalls.hpp" 56 #include "runtime/mutexLocker.hpp" 57 #include "utilities/hashtable.inline.hpp" 58 #include "utilities/resourceHash.hpp" 59 #include "utilities/stringUtils.hpp" 60 61 62 objArrayOop SystemDictionaryShared::_shared_protection_domains = NULL; 63 objArrayOop SystemDictionaryShared::_shared_jar_urls = NULL; 64 objArrayOop SystemDictionaryShared::_shared_jar_manifests = NULL; 65 DEBUG_ONLY(bool SystemDictionaryShared::_no_class_loading_should_happen = false;) 66 67 class DumpTimeSharedClassInfo: public CHeapObj<mtClass> { 68 bool _excluded; 69 public: 70 struct DTConstraint { 71 Symbol* _name; 72 Symbol* _from_name; 73 DTConstraint() : _name(NULL), _from_name(NULL) {} 74 DTConstraint(Symbol* n, Symbol* fn) : _name(n), _from_name(fn) {} 75 }; 76 77 InstanceKlass* _klass; 78 int _id; 79 int _clsfile_size; 80 int _clsfile_crc32; 81 GrowableArray<DTConstraint>* _verifier_constraints; 82 GrowableArray<char>* _verifier_constraint_flags; 83 84 DumpTimeSharedClassInfo() { 85 _klass = NULL; 86 _id = -1; 87 _clsfile_size = -1; 88 _clsfile_crc32 = -1; 89 _excluded = false; 90 _verifier_constraints = NULL; 91 _verifier_constraint_flags = NULL; 92 } 93 94 void add_verification_constraint(InstanceKlass* k, Symbol* name, 95 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object); 96 97 bool is_builtin() { 98 return SystemDictionaryShared::is_builtin(_klass); 99 } 100 101 int num_constraints() { 102 if (_verifier_constraint_flags != NULL) { 103 return _verifier_constraint_flags->length(); 104 } else { 105 return 0; 106 } 107 } 108 109 void metaspace_pointers_do(MetaspaceClosure* it) { 110 it->push(&_klass); 111 if (_verifier_constraints != NULL) { 112 for (int i = 0; i < _verifier_constraints->length(); i++) { 113 DTConstraint* cons = _verifier_constraints->adr_at(i); 114 it->push(&cons->_name); 115 it->push(&cons->_from_name); 116 } 117 } 118 } 119 120 void set_excluded() { 121 _excluded = true; 122 } 123 124 bool is_excluded() { 125 // _klass may become NULL due to DynamicArchiveBuilder::set_to_null 126 return _excluded || _klass == NULL; 127 } 128 }; 129 130 class DumpTimeSharedClassTable: public ResourceHashtable< 131 InstanceKlass*, 132 DumpTimeSharedClassInfo, 133 primitive_hash<InstanceKlass*>, 134 primitive_equals<InstanceKlass*>, 135 15889, // prime number 136 ResourceObj::C_HEAP> 137 { 138 int _builtin_count; 139 int _unregistered_count; 140 public: 141 DumpTimeSharedClassInfo* find_or_allocate_info_for(InstanceKlass* k) { 142 DumpTimeSharedClassInfo* p = get(k); 143 if (p == NULL) { 144 assert(!SystemDictionaryShared::no_class_loading_should_happen(), 145 "no new classes can be loaded while dumping archive"); 146 put(k, DumpTimeSharedClassInfo()); 147 p = get(k); 148 assert(p != NULL, "sanity"); 149 p->_klass = k; 150 } 151 return p; 152 } 153 154 class CountClassByCategory : StackObj { 155 DumpTimeSharedClassTable* _table; 156 public: 157 CountClassByCategory(DumpTimeSharedClassTable* table) : _table(table) {} 158 bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) { 159 if (!info.is_excluded()) { 160 if (info.is_builtin()) { 161 ++ _table->_builtin_count; 162 } else { 163 ++ _table->_unregistered_count; 164 } 165 } 166 return true; // keep on iterating 167 } 168 }; 169 170 void update_counts() { 171 _builtin_count = 0; 172 _unregistered_count = 0; 173 CountClassByCategory counter(this); 174 iterate(&counter); 175 } 176 177 int count_of(bool is_builtin) const { 178 if (is_builtin) { 179 return _builtin_count; 180 } else { 181 return _unregistered_count; 182 } 183 } 184 }; 185 186 class RunTimeSharedClassInfo { 187 public: 188 struct CrcInfo { 189 int _clsfile_size; 190 int _clsfile_crc32; 191 }; 192 193 // This is different than DumpTimeSharedClassInfo::DTConstraint. We use 194 // u4 instead of Symbol* to save space on 64-bit CPU. 195 struct RTConstraint { 196 u4 _name; 197 u4 _from_name; 198 }; 199 200 InstanceKlass* _klass; 201 int _num_constraints; 202 203 // optional CrcInfo _crc; (only for UNREGISTERED classes) 204 // optional RTConstraint _verifier_constraints[_num_constraints] 205 // optional char _verifier_constraint_flags[_num_constraints] 206 207 private: 208 static size_t header_size_size() { 209 return sizeof(RunTimeSharedClassInfo); 210 } 211 static size_t crc_size(InstanceKlass* klass) { 212 if (!SystemDictionaryShared::is_builtin(klass)) { 213 return sizeof(CrcInfo); 214 } else { 215 return 0; 216 } 217 } 218 static size_t verifier_constraints_size(int num_constraints) { 219 return sizeof(RTConstraint) * num_constraints; 220 } 221 static size_t verifier_constraint_flags_size(int num_constraints) { 222 return sizeof(char) * num_constraints; 223 } 224 225 public: 226 static size_t byte_size(InstanceKlass* klass, int num_constraints) { 227 return header_size_size() + 228 crc_size(klass) + 229 verifier_constraints_size(num_constraints) + 230 verifier_constraint_flags_size(num_constraints); 231 } 232 233 private: 234 size_t crc_offset() const { 235 return header_size_size(); 236 } 237 size_t verifier_constraints_offset() const { 238 return crc_offset() + crc_size(_klass); 239 } 240 size_t verifier_constraint_flags_offset() const { 241 return verifier_constraints_offset() + verifier_constraints_size(_num_constraints); 242 } 243 244 void check_constraint_offset(int i) const { 245 assert(0 <= i && i < _num_constraints, "sanity"); 246 } 247 248 public: 249 CrcInfo* crc() const { 250 assert(crc_size(_klass) > 0, "must be"); 251 return (CrcInfo*)(address(this) + crc_offset()); 252 } 253 RTConstraint* verifier_constraints() { 254 assert(_num_constraints > 0, "sanity"); 255 return (RTConstraint*)(address(this) + verifier_constraints_offset()); 256 } 257 RTConstraint* verifier_constraint_at(int i) { 258 check_constraint_offset(i); 259 return verifier_constraints() + i; 260 } 261 262 char* verifier_constraint_flags() { 263 assert(_num_constraints > 0, "sanity"); 264 return (char*)(address(this) + verifier_constraint_flags_offset()); 265 } 266 267 static u4 object_delta_u4(Symbol* sym) { 268 if (DynamicDumpSharedSpaces) { 269 sym = DynamicArchive::original_to_target(sym); 270 } 271 return MetaspaceShared::object_delta_u4(sym); 272 } 273 274 void init(DumpTimeSharedClassInfo& info) { 275 _klass = info._klass; 276 if (!SystemDictionaryShared::is_builtin(_klass)) { 277 CrcInfo* c = crc(); 278 c->_clsfile_size = info._clsfile_size; 279 c->_clsfile_crc32 = info._clsfile_crc32; 280 } 281 _num_constraints = info.num_constraints(); 282 if (_num_constraints > 0) { 283 RTConstraint* constraints = verifier_constraints(); 284 char* flags = verifier_constraint_flags(); 285 int i; 286 for (i = 0; i < _num_constraints; i++) { 287 constraints[i]._name = object_delta_u4(info._verifier_constraints->at(i)._name); 288 constraints[i]._from_name = object_delta_u4(info._verifier_constraints->at(i)._from_name); 289 } 290 for (i = 0; i < _num_constraints; i++) { 291 flags[i] = info._verifier_constraint_flags->at(i); 292 } 293 } 294 if (DynamicDumpSharedSpaces) { 295 _klass = DynamicArchive::original_to_target(info._klass); 296 } 297 } 298 299 bool matches(int clsfile_size, int clsfile_crc32) const { 300 return crc()->_clsfile_size == clsfile_size && 301 crc()->_clsfile_crc32 == clsfile_crc32; 302 } 303 304 Symbol* get_constraint_name(int i) { 305 return (Symbol*)(SharedBaseAddress + verifier_constraint_at(i)->_name); 306 } 307 Symbol* get_constraint_from_name(int i) { 308 return (Symbol*)(SharedBaseAddress + verifier_constraint_at(i)->_from_name); 309 } 310 311 char get_constraint_flag(int i) { 312 check_constraint_offset(i); 313 return verifier_constraint_flags()[i]; 314 } 315 316 private: 317 // ArchiveCompactor::allocate() has reserved a pointer immediately before 318 // archived InstanceKlasses. We can use this slot to do a quick 319 // lookup of InstanceKlass* -> RunTimeSharedClassInfo* without 320 // building a new hashtable. 321 // 322 // info_pointer_addr(klass) --> 0x0100 RunTimeSharedClassInfo* 323 // InstanceKlass* klass --> 0x0108 <C++ vtbl> 324 // 0x0110 fields from Klass ... 325 static RunTimeSharedClassInfo** info_pointer_addr(InstanceKlass* klass) { 326 return &((RunTimeSharedClassInfo**)klass)[-1]; 327 } 328 329 public: 330 static RunTimeSharedClassInfo* get_for(InstanceKlass* klass) { 331 return *info_pointer_addr(klass); 332 } 333 static void set_for(InstanceKlass* klass, RunTimeSharedClassInfo* record) { 334 if (DynamicDumpSharedSpaces) { 335 klass = DynamicArchive::original_to_buffer(klass); 336 *info_pointer_addr(klass) = DynamicArchive::buffer_to_target(record); 337 } else { 338 *info_pointer_addr(klass) = record; 339 } 340 } 341 342 // Used by RunTimeSharedDictionary to implement OffsetCompactHashtable::EQUALS 343 static inline bool EQUALS( 344 const RunTimeSharedClassInfo* value, Symbol* key, int len_unused) { 345 return (value->_klass->name() == key); 346 } 347 }; 348 349 class RunTimeSharedDictionary : public OffsetCompactHashtable< 350 Symbol*, 351 const RunTimeSharedClassInfo*, 352 RunTimeSharedClassInfo::EQUALS> {}; 353 354 static DumpTimeSharedClassTable* _dumptime_table = NULL; 355 // SystemDictionaries in the base layer static archive 356 static RunTimeSharedDictionary _builtin_dictionary; 357 static RunTimeSharedDictionary _unregistered_dictionary; 358 // SystemDictionaries in the top layer dynamic archive 359 static RunTimeSharedDictionary _dynamic_builtin_dictionary; 360 static RunTimeSharedDictionary _dynamic_unregistered_dictionary; 361 362 oop SystemDictionaryShared::shared_protection_domain(int index) { 363 return _shared_protection_domains->obj_at(index); 364 } 365 366 oop SystemDictionaryShared::shared_jar_url(int index) { 367 return _shared_jar_urls->obj_at(index); 368 } 369 370 oop SystemDictionaryShared::shared_jar_manifest(int index) { 371 return _shared_jar_manifests->obj_at(index); 372 } 373 374 375 Handle SystemDictionaryShared::get_shared_jar_manifest(int shared_path_index, TRAPS) { 376 Handle manifest ; 377 if (shared_jar_manifest(shared_path_index) == NULL) { 378 SharedClassPathEntry* ent = FileMapInfo::shared_path(shared_path_index); 379 long size = ent->manifest_size(); 380 if (size <= 0) { 381 return Handle(); 382 } 383 384 // ByteArrayInputStream bais = new ByteArrayInputStream(buf); 385 const char* src = ent->manifest(); 386 assert(src != NULL, "No Manifest data"); 387 typeArrayOop buf = oopFactory::new_byteArray(size, CHECK_NH); 388 typeArrayHandle bufhandle(THREAD, buf); 389 ArrayAccess<>::arraycopy_from_native(reinterpret_cast<const jbyte*>(src), 390 buf, typeArrayOopDesc::element_offset<jbyte>(0), size); 391 392 Handle bais = JavaCalls::construct_new_instance(SystemDictionary::ByteArrayInputStream_klass(), 393 vmSymbols::byte_array_void_signature(), 394 bufhandle, CHECK_NH); 395 396 // manifest = new Manifest(bais) 397 manifest = JavaCalls::construct_new_instance(SystemDictionary::Jar_Manifest_klass(), 398 vmSymbols::input_stream_void_signature(), 399 bais, CHECK_NH); 400 atomic_set_shared_jar_manifest(shared_path_index, manifest()); 401 } 402 403 manifest = Handle(THREAD, shared_jar_manifest(shared_path_index)); 404 assert(manifest.not_null(), "sanity"); 405 return manifest; 406 } 407 408 Handle SystemDictionaryShared::get_shared_jar_url(int shared_path_index, TRAPS) { 409 Handle url_h; 410 if (shared_jar_url(shared_path_index) == NULL) { 411 JavaValue result(T_OBJECT); 412 const char* path = FileMapInfo::shared_path_name(shared_path_index); 413 Handle path_string = java_lang_String::create_from_str(path, CHECK_(url_h)); 414 Klass* classLoaders_klass = 415 SystemDictionary::jdk_internal_loader_ClassLoaders_klass(); 416 JavaCalls::call_static(&result, classLoaders_klass, 417 vmSymbols::toFileURL_name(), 418 vmSymbols::toFileURL_signature(), 419 path_string, CHECK_(url_h)); 420 421 atomic_set_shared_jar_url(shared_path_index, (oop)result.get_jobject()); 422 } 423 424 url_h = Handle(THREAD, shared_jar_url(shared_path_index)); 425 assert(url_h.not_null(), "sanity"); 426 return url_h; 427 } 428 429 Handle SystemDictionaryShared::get_package_name(Symbol* class_name, TRAPS) { 430 ResourceMark rm(THREAD); 431 Handle pkgname_string; 432 char* pkgname = (char*) ClassLoader::package_from_name((const char*) class_name->as_C_string()); 433 if (pkgname != NULL) { // Package prefix found 434 StringUtils::replace_no_expand(pkgname, "/", "."); 435 pkgname_string = java_lang_String::create_from_str(pkgname, 436 CHECK_(pkgname_string)); 437 } 438 return pkgname_string; 439 } 440 441 // Define Package for shared app classes from JAR file and also checks for 442 // package sealing (all done in Java code) 443 // See http://docs.oracle.com/javase/tutorial/deployment/jar/sealman.html 444 void SystemDictionaryShared::define_shared_package(Symbol* class_name, 445 Handle class_loader, 446 Handle manifest, 447 Handle url, 448 TRAPS) { 449 assert(SystemDictionary::is_system_class_loader(class_loader()), "unexpected class loader"); 450 // get_package_name() returns a NULL handle if the class is in unnamed package 451 Handle pkgname_string = get_package_name(class_name, CHECK); 452 if (pkgname_string.not_null()) { 453 Klass* app_classLoader_klass = SystemDictionary::jdk_internal_loader_ClassLoaders_AppClassLoader_klass(); 454 JavaValue result(T_OBJECT); 455 JavaCallArguments args(3); 456 args.set_receiver(class_loader); 457 args.push_oop(pkgname_string); 458 args.push_oop(manifest); 459 args.push_oop(url); 460 JavaCalls::call_virtual(&result, app_classLoader_klass, 461 vmSymbols::defineOrCheckPackage_name(), 462 vmSymbols::defineOrCheckPackage_signature(), 463 &args, 464 CHECK); 465 } 466 } 467 468 // Define Package for shared app/platform classes from named module 469 void SystemDictionaryShared::define_shared_package(Symbol* class_name, 470 Handle class_loader, 471 ModuleEntry* mod_entry, 472 TRAPS) { 473 assert(mod_entry != NULL, "module_entry should not be NULL"); 474 Handle module_handle(THREAD, mod_entry->module()); 475 476 Handle pkg_name = get_package_name(class_name, CHECK); 477 assert(pkg_name.not_null(), "Package should not be null for class in named module"); 478 479 Klass* classLoader_klass; 480 if (SystemDictionary::is_system_class_loader(class_loader())) { 481 classLoader_klass = SystemDictionary::jdk_internal_loader_ClassLoaders_AppClassLoader_klass(); 482 } else { 483 assert(SystemDictionary::is_platform_class_loader(class_loader()), "unexpected classloader"); 484 classLoader_klass = SystemDictionary::jdk_internal_loader_ClassLoaders_PlatformClassLoader_klass(); 485 } 486 487 JavaValue result(T_OBJECT); 488 JavaCallArguments args(2); 489 args.set_receiver(class_loader); 490 args.push_oop(pkg_name); 491 args.push_oop(module_handle); 492 JavaCalls::call_virtual(&result, classLoader_klass, 493 vmSymbols::definePackage_name(), 494 vmSymbols::definePackage_signature(), 495 &args, 496 CHECK); 497 } 498 499 // Get the ProtectionDomain associated with the CodeSource from the classloader. 500 Handle SystemDictionaryShared::get_protection_domain_from_classloader(Handle class_loader, 501 Handle url, TRAPS) { 502 // CodeSource cs = new CodeSource(url, null); 503 Handle cs = JavaCalls::construct_new_instance(SystemDictionary::CodeSource_klass(), 504 vmSymbols::url_code_signer_array_void_signature(), 505 url, Handle(), CHECK_NH); 506 507 // protection_domain = SecureClassLoader.getProtectionDomain(cs); 508 Klass* secureClassLoader_klass = SystemDictionary::SecureClassLoader_klass(); 509 JavaValue obj_result(T_OBJECT); 510 JavaCalls::call_virtual(&obj_result, class_loader, secureClassLoader_klass, 511 vmSymbols::getProtectionDomain_name(), 512 vmSymbols::getProtectionDomain_signature(), 513 cs, CHECK_NH); 514 return Handle(THREAD, (oop)obj_result.get_jobject()); 515 } 516 517 // Returns the ProtectionDomain associated with the JAR file identified by the url. 518 Handle SystemDictionaryShared::get_shared_protection_domain(Handle class_loader, 519 int shared_path_index, 520 Handle url, 521 TRAPS) { 522 Handle protection_domain; 523 if (shared_protection_domain(shared_path_index) == NULL) { 524 Handle pd = get_protection_domain_from_classloader(class_loader, url, THREAD); 525 atomic_set_shared_protection_domain(shared_path_index, pd()); 526 } 527 528 // Acquire from the cache because if another thread beats the current one to 529 // set the shared protection_domain and the atomic_set fails, the current thread 530 // needs to get the updated protection_domain from the cache. 531 protection_domain = Handle(THREAD, shared_protection_domain(shared_path_index)); 532 assert(protection_domain.not_null(), "sanity"); 533 return protection_domain; 534 } 535 536 // Returns the ProtectionDomain associated with the moduleEntry. 537 Handle SystemDictionaryShared::get_shared_protection_domain(Handle class_loader, 538 ModuleEntry* mod, TRAPS) { 539 ClassLoaderData *loader_data = mod->loader_data(); 540 if (mod->shared_protection_domain() == NULL) { 541 Symbol* location = mod->location(); 542 if (location != NULL) { 543 Handle location_string = java_lang_String::create_from_symbol( 544 location, CHECK_NH); 545 Handle url; 546 JavaValue result(T_OBJECT); 547 if (location->starts_with("jrt:/")) { 548 url = JavaCalls::construct_new_instance(SystemDictionary::URL_klass(), 549 vmSymbols::string_void_signature(), 550 location_string, CHECK_NH); 551 } else { 552 Klass* classLoaders_klass = 553 SystemDictionary::jdk_internal_loader_ClassLoaders_klass(); 554 JavaCalls::call_static(&result, classLoaders_klass, vmSymbols::toFileURL_name(), 555 vmSymbols::toFileURL_signature(), 556 location_string, CHECK_NH); 557 url = Handle(THREAD, (oop)result.get_jobject()); 558 } 559 560 Handle pd = get_protection_domain_from_classloader(class_loader, url, 561 CHECK_NH); 562 mod->set_shared_protection_domain(loader_data, pd); 563 } 564 } 565 566 Handle protection_domain(THREAD, mod->shared_protection_domain()); 567 assert(protection_domain.not_null(), "sanity"); 568 return protection_domain; 569 } 570 571 // Initializes the java.lang.Package and java.security.ProtectionDomain objects associated with 572 // the given InstanceKlass. 573 // Returns the ProtectionDomain for the InstanceKlass. 574 Handle SystemDictionaryShared::init_security_info(Handle class_loader, InstanceKlass* ik, TRAPS) { 575 Handle pd; 576 577 if (ik != NULL) { 578 int index = ik->shared_classpath_index(); 579 assert(index >= 0, "Sanity"); 580 SharedClassPathEntry* ent = FileMapInfo::shared_path(index); 581 Symbol* class_name = ik->name(); 582 583 if (ent->is_modules_image()) { 584 // For shared app/platform classes originated from the run-time image: 585 // The ProtectionDomains are cached in the corresponding ModuleEntries 586 // for fast access by the VM. 587 ResourceMark rm; 588 ClassLoaderData *loader_data = 589 ClassLoaderData::class_loader_data(class_loader()); 590 PackageEntryTable* pkgEntryTable = loader_data->packages(); 591 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK_(pd)); 592 if (pkg_name != NULL) { 593 PackageEntry* pkg_entry = pkgEntryTable->lookup_only(pkg_name); 594 if (pkg_entry != NULL) { 595 ModuleEntry* mod_entry = pkg_entry->module(); 596 pd = get_shared_protection_domain(class_loader, mod_entry, THREAD); 597 define_shared_package(class_name, class_loader, mod_entry, CHECK_(pd)); 598 } 599 } 600 } else { 601 // For shared app/platform classes originated from JAR files on the class path: 602 // Each of the 3 SystemDictionaryShared::_shared_xxx arrays has the same length 603 // as the shared classpath table in the shared archive (see 604 // FileMap::_shared_path_table in filemap.hpp for details). 605 // 606 // If a shared InstanceKlass k is loaded from the class path, let 607 // 608 // index = k->shared_classpath_index(): 609 // 610 // FileMap::_shared_path_table[index] identifies the JAR file that contains k. 611 // 612 // k's protection domain is: 613 // 614 // ProtectionDomain pd = _shared_protection_domains[index]; 615 // 616 // and k's Package is initialized using 617 // 618 // manifest = _shared_jar_manifests[index]; 619 // url = _shared_jar_urls[index]; 620 // define_shared_package(class_name, class_loader, manifest, url, CHECK_(pd)); 621 // 622 // Note that if an element of these 3 _shared_xxx arrays is NULL, it will be initialized by 623 // the corresponding SystemDictionaryShared::get_shared_xxx() function. 624 Handle manifest = get_shared_jar_manifest(index, CHECK_(pd)); 625 Handle url = get_shared_jar_url(index, CHECK_(pd)); 626 define_shared_package(class_name, class_loader, manifest, url, CHECK_(pd)); 627 pd = get_shared_protection_domain(class_loader, index, url, CHECK_(pd)); 628 } 629 } 630 return pd; 631 } 632 633 bool SystemDictionaryShared::is_sharing_possible(ClassLoaderData* loader_data) { 634 oop class_loader = loader_data->class_loader(); 635 return (class_loader == NULL || 636 SystemDictionary::is_system_class_loader(class_loader) || 637 SystemDictionary::is_platform_class_loader(class_loader)); 638 } 639 640 // Currently AppCDS only archives classes from the run-time image, the 641 // -Xbootclasspath/a path, the class path, and the module path. 642 // 643 // Check if a shared class can be loaded by the specific classloader. Following 644 // are the "visible" archived classes for different classloaders. 645 // 646 // NULL classloader: 647 // - see SystemDictionary::is_shared_class_visible() 648 // Platform classloader: 649 // - Module class from runtime image. ModuleEntry must be defined in the 650 // classloader. 651 // App classloader: 652 // - Module Class from runtime image and module path. ModuleEntry must be defined in the 653 // classloader. 654 // - Class from -cp. The class must have no PackageEntry defined in any of the 655 // boot/platform/app classloader, or must be in the unnamed module defined in the 656 // AppClassLoader. 657 bool SystemDictionaryShared::is_shared_class_visible_for_classloader( 658 InstanceKlass* ik, 659 Handle class_loader, 660 const char* pkg_string, 661 Symbol* pkg_name, 662 PackageEntry* pkg_entry, 663 ModuleEntry* mod_entry, 664 TRAPS) { 665 assert(class_loader.not_null(), "Class loader should not be NULL"); 666 assert(Universe::is_module_initialized(), "Module system is not initialized"); 667 ResourceMark rm(THREAD); 668 669 int path_index = ik->shared_classpath_index(); 670 SharedClassPathEntry* ent = 671 (SharedClassPathEntry*)FileMapInfo::shared_path(path_index); 672 673 if (SystemDictionary::is_platform_class_loader(class_loader())) { 674 assert(ent != NULL, "shared class for PlatformClassLoader should have valid SharedClassPathEntry"); 675 // The PlatformClassLoader can only load archived class originated from the 676 // run-time image. The class' PackageEntry/ModuleEntry must be 677 // defined by the PlatformClassLoader. 678 if (mod_entry != NULL) { 679 // PackageEntry/ModuleEntry is found in the classloader. Check if the 680 // ModuleEntry's location agrees with the archived class' origination. 681 if (ent->is_modules_image() && mod_entry->location()->starts_with("jrt:")) { 682 return true; // Module class from the runtime image 683 } 684 } 685 } else if (SystemDictionary::is_system_class_loader(class_loader())) { 686 assert(ent != NULL, "shared class for system loader should have valid SharedClassPathEntry"); 687 if (pkg_string == NULL) { 688 // The archived class is in the unnamed package. Currently, the boot image 689 // does not contain any class in the unnamed package. 690 assert(!ent->is_modules_image(), "Class in the unnamed package must be from the classpath"); 691 if (path_index >= ClassLoaderExt::app_class_paths_start_index()) { 692 assert(path_index < ClassLoaderExt::app_module_paths_start_index(), "invalid path_index"); 693 return true; 694 } 695 } else { 696 // Check if this is from a PackageEntry/ModuleEntry defined in the AppClassloader. 697 if (pkg_entry == NULL) { 698 // It's not guaranteed that the class is from the classpath if the 699 // PackageEntry cannot be found from the AppClassloader. Need to check 700 // the boot and platform classloader as well. 701 if (get_package_entry(pkg_name, ClassLoaderData::class_loader_data_or_null(SystemDictionary::java_platform_loader())) == NULL && 702 get_package_entry(pkg_name, ClassLoaderData::the_null_class_loader_data()) == NULL) { 703 // The PackageEntry is not defined in any of the boot/platform/app classloaders. 704 // The archived class must from -cp path and not from the runtime image. 705 if (!ent->is_modules_image() && path_index >= ClassLoaderExt::app_class_paths_start_index() && 706 path_index < ClassLoaderExt::app_module_paths_start_index()) { 707 return true; 708 } 709 } 710 } else if (mod_entry != NULL) { 711 // The package/module is defined in the AppClassLoader. We support 712 // archiving application module class from the runtime image or from 713 // a named module from a module path. 714 // Packages from the -cp path are in the unnamed_module. 715 if (ent->is_modules_image() && mod_entry->location()->starts_with("jrt:")) { 716 // shared module class from runtime image 717 return true; 718 } else if (pkg_entry->in_unnamed_module() && path_index >= ClassLoaderExt::app_class_paths_start_index() && 719 path_index < ClassLoaderExt::app_module_paths_start_index()) { 720 // shared class from -cp 721 DEBUG_ONLY( \ 722 ClassLoaderData* loader_data = class_loader_data(class_loader); \ 723 assert(mod_entry == loader_data->unnamed_module(), "the unnamed module is not defined in the classloader");) 724 return true; 725 } else { 726 if(!pkg_entry->in_unnamed_module() && 727 (path_index >= ClassLoaderExt::app_module_paths_start_index())&& 728 (path_index < FileMapInfo::get_number_of_shared_paths()) && 729 (strcmp(ent->name(), ClassLoader::skip_uri_protocol(mod_entry->location()->as_C_string())) == 0)) { 730 // shared module class from module path 731 return true; 732 } else { 733 assert(path_index < FileMapInfo::get_number_of_shared_paths(), "invalid path_index"); 734 } 735 } 736 } 737 } 738 } else { 739 // TEMP: if a shared class can be found by a custom loader, consider it visible now. 740 // FIXME: is this actually correct? 741 return true; 742 } 743 return false; 744 } 745 746 bool SystemDictionaryShared::has_platform_or_app_classes() { 747 if (FileMapInfo::current_info()->has_platform_or_app_classes()) { 748 return true; 749 } 750 if (DynamicArchive::is_mapped() && 751 FileMapInfo::dynamic_info()->has_platform_or_app_classes()) { 752 return true; 753 } 754 return false; 755 } 756 757 // The following stack shows how this code is reached: 758 // 759 // [0] SystemDictionaryShared::find_or_load_shared_class() 760 // [1] JVM_FindLoadedClass 761 // [2] java.lang.ClassLoader.findLoadedClass0() 762 // [3] java.lang.ClassLoader.findLoadedClass() 763 // [4] jdk.internal.loader.BuiltinClassLoader.loadClassOrNull() 764 // [5] jdk.internal.loader.BuiltinClassLoader.loadClass() 765 // [6] jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(), or 766 // jdk.internal.loader.ClassLoaders$PlatformClassLoader.loadClass() 767 // 768 // AppCDS supports fast class loading for these 2 built-in class loaders: 769 // jdk.internal.loader.ClassLoaders$PlatformClassLoader 770 // jdk.internal.loader.ClassLoaders$AppClassLoader 771 // with the following assumptions (based on the JDK core library source code): 772 // 773 // [a] these two loaders use the BuiltinClassLoader.loadClassOrNull() to 774 // load the named class. 775 // [b] BuiltinClassLoader.loadClassOrNull() first calls findLoadedClass(name). 776 // [c] At this point, if we can find the named class inside the 777 // shared_dictionary, we can perform further checks (see 778 // is_shared_class_visible_for_classloader() to ensure that this class 779 // was loaded by the same class loader during dump time. 780 // 781 // Given these assumptions, we intercept the findLoadedClass() call to invoke 782 // SystemDictionaryShared::find_or_load_shared_class() to load the shared class from 783 // the archive for the 2 built-in class loaders. This way, 784 // we can improve start-up because we avoid decoding the classfile, 785 // and avoid delegating to the parent loader. 786 // 787 // NOTE: there's a lot of assumption about the Java code. If any of that change, this 788 // needs to be redesigned. 789 790 InstanceKlass* SystemDictionaryShared::find_or_load_shared_class( 791 Symbol* name, Handle class_loader, TRAPS) { 792 InstanceKlass* k = NULL; 793 if (UseSharedSpaces) { 794 if (!has_platform_or_app_classes()) { 795 return NULL; 796 } 797 798 if (SystemDictionary::is_system_class_loader(class_loader()) || 799 SystemDictionary::is_platform_class_loader(class_loader())) { 800 // Fix for 4474172; see evaluation for more details 801 class_loader = Handle( 802 THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); 803 ClassLoaderData *loader_data = register_loader(class_loader); 804 Dictionary* dictionary = loader_data->dictionary(); 805 806 unsigned int d_hash = dictionary->compute_hash(name); 807 808 bool DoObjectLock = true; 809 if (is_parallelCapable(class_loader)) { 810 DoObjectLock = false; 811 } 812 813 // Make sure we are synchronized on the class loader before we proceed 814 // 815 // Note: currently, find_or_load_shared_class is called only from 816 // JVM_FindLoadedClass and used for PlatformClassLoader and AppClassLoader, 817 // which are parallel-capable loaders, so this lock is NOT taken. 818 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); 819 check_loader_lock_contention(lockObject, THREAD); 820 ObjectLocker ol(lockObject, THREAD, DoObjectLock); 821 822 { 823 MutexLocker mu(SystemDictionary_lock, THREAD); 824 InstanceKlass* check = find_class(d_hash, name, dictionary); 825 if (check != NULL) { 826 return check; 827 } 828 } 829 830 k = load_shared_class_for_builtin_loader(name, class_loader, THREAD); 831 if (k != NULL) { 832 define_instance_class(k, CHECK_NULL); 833 } 834 } 835 } 836 return k; 837 } 838 839 InstanceKlass* SystemDictionaryShared::load_shared_class_for_builtin_loader( 840 Symbol* class_name, Handle class_loader, TRAPS) { 841 assert(UseSharedSpaces, "must be"); 842 InstanceKlass* ik = find_builtin_class(class_name); 843 844 if (ik != NULL) { 845 if ((ik->is_shared_app_class() && 846 SystemDictionary::is_system_class_loader(class_loader())) || 847 (ik->is_shared_platform_class() && 848 SystemDictionary::is_platform_class_loader(class_loader()))) { 849 Handle protection_domain = 850 SystemDictionaryShared::init_security_info(class_loader, ik, CHECK_NULL); 851 return load_shared_class(ik, class_loader, protection_domain, NULL, THREAD); 852 } 853 } 854 return NULL; 855 } 856 857 void SystemDictionaryShared::oops_do(OopClosure* f) { 858 f->do_oop((oop*)&_shared_protection_domains); 859 f->do_oop((oop*)&_shared_jar_urls); 860 f->do_oop((oop*)&_shared_jar_manifests); 861 } 862 863 void SystemDictionaryShared::allocate_shared_protection_domain_array(int size, TRAPS) { 864 if (_shared_protection_domains == NULL) { 865 _shared_protection_domains = oopFactory::new_objArray( 866 SystemDictionary::ProtectionDomain_klass(), size, CHECK); 867 } 868 } 869 870 void SystemDictionaryShared::allocate_shared_jar_url_array(int size, TRAPS) { 871 if (_shared_jar_urls == NULL) { 872 _shared_jar_urls = oopFactory::new_objArray( 873 SystemDictionary::URL_klass(), size, CHECK); 874 } 875 } 876 877 void SystemDictionaryShared::allocate_shared_jar_manifest_array(int size, TRAPS) { 878 if (_shared_jar_manifests == NULL) { 879 _shared_jar_manifests = oopFactory::new_objArray( 880 SystemDictionary::Jar_Manifest_klass(), size, CHECK); 881 } 882 } 883 884 void SystemDictionaryShared::allocate_shared_data_arrays(int size, TRAPS) { 885 allocate_shared_protection_domain_array(size, CHECK); 886 allocate_shared_jar_url_array(size, CHECK); 887 allocate_shared_jar_manifest_array(size, CHECK); 888 } 889 890 // This function is called for loading only UNREGISTERED classes 891 InstanceKlass* SystemDictionaryShared::lookup_from_stream(Symbol* class_name, 892 Handle class_loader, 893 Handle protection_domain, 894 const ClassFileStream* cfs, 895 TRAPS) { 896 if (!UseSharedSpaces) { 897 return NULL; 898 } 899 if (class_name == NULL) { // don't do this for anonymous classes 900 return NULL; 901 } 902 if (class_loader.is_null() || 903 SystemDictionary::is_system_class_loader(class_loader()) || 904 SystemDictionary::is_platform_class_loader(class_loader())) { 905 // Do nothing for the BUILTIN loaders. 906 return NULL; 907 } 908 909 const RunTimeSharedClassInfo* record = find_record(&_unregistered_dictionary, class_name); 910 if (record == NULL) { 911 if (DynamicArchive::is_mapped()) { 912 record = find_record(&_dynamic_unregistered_dictionary, class_name); 913 } 914 if (record == NULL) { 915 return NULL; 916 } 917 } 918 919 int clsfile_size = cfs->length(); 920 int clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length()); 921 922 if (!record->matches(clsfile_size, clsfile_crc32)) { 923 return NULL; 924 } 925 926 return acquire_class_for_current_thread(record->_klass, class_loader, 927 protection_domain, cfs, 928 THREAD); 929 } 930 931 InstanceKlass* SystemDictionaryShared::acquire_class_for_current_thread( 932 InstanceKlass *ik, 933 Handle class_loader, 934 Handle protection_domain, 935 const ClassFileStream *cfs, 936 TRAPS) { 937 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader()); 938 939 { 940 MutexLocker mu(SharedDictionary_lock, THREAD); 941 if (ik->class_loader_data() != NULL) { 942 // ik is already loaded (by this loader or by a different loader) 943 // or ik is being loaded by a different thread (by this loader or by a different loader) 944 return NULL; 945 } 946 947 // No other thread has acquired this yet, so give it to *this thread* 948 ik->set_class_loader_data(loader_data); 949 } 950 951 // No longer holding SharedDictionary_lock 952 // No need to lock, as <ik> can be held only by a single thread. 953 loader_data->add_class(ik); 954 955 // Load and check super/interfaces, restore unsharable info 956 InstanceKlass* shared_klass = load_shared_class(ik, class_loader, protection_domain, 957 cfs, THREAD); 958 if (shared_klass == NULL || HAS_PENDING_EXCEPTION) { 959 // TODO: clean up <ik> so it can be used again 960 return NULL; 961 } 962 963 return shared_klass; 964 } 965 966 static ResourceHashtable< 967 Symbol*, bool, 968 primitive_hash<Symbol*>, 969 primitive_equals<Symbol*>, 970 6661, // prime number 971 ResourceObj::C_HEAP> _loaded_unregistered_classes; 972 973 bool SystemDictionaryShared::add_unregistered_class(InstanceKlass* k, TRAPS) { 974 assert(DumpSharedSpaces, "only when dumping"); 975 976 Symbol* name = k->name(); 977 if (_loaded_unregistered_classes.get(name) != NULL) { 978 // We don't allow duplicated unregistered classes of the same name. 979 return false; 980 } else { 981 bool isnew = _loaded_unregistered_classes.put(name, true); 982 assert(isnew, "sanity"); 983 MutexLocker mu_r(Compile_lock, THREAD); // add_to_hierarchy asserts this. 984 SystemDictionary::add_to_hierarchy(k, CHECK_0); 985 return true; 986 } 987 } 988 989 // This function is called to resolve the super/interfaces of shared classes for 990 // non-built-in loaders. E.g., ChildClass in the below example 991 // where "super:" (and optionally "interface:") have been specified. 992 // 993 // java/lang/Object id: 0 994 // Interface id: 2 super: 0 source: cust.jar 995 // ChildClass id: 4 super: 0 interfaces: 2 source: cust.jar 996 InstanceKlass* SystemDictionaryShared::dump_time_resolve_super_or_fail( 997 Symbol* child_name, Symbol* class_name, Handle class_loader, 998 Handle protection_domain, bool is_superclass, TRAPS) { 999 1000 assert(DumpSharedSpaces, "only when dumping"); 1001 1002 ClassListParser* parser = ClassListParser::instance(); 1003 if (parser == NULL) { 1004 // We're still loading the well-known classes, before the ClassListParser is created. 1005 return NULL; 1006 } 1007 if (child_name->equals(parser->current_class_name())) { 1008 // When this function is called, all the numbered super and interface types 1009 // must have already been loaded. Hence this function is never recursively called. 1010 if (is_superclass) { 1011 return parser->lookup_super_for_current_class(class_name); 1012 } else { 1013 return parser->lookup_interface_for_current_class(class_name); 1014 } 1015 } else { 1016 // The VM is not trying to resolve a super type of parser->current_class_name(). 1017 // Instead, it's resolving an error class (because parser->current_class_name() has 1018 // failed parsing or verification). Don't do anything here. 1019 return NULL; 1020 } 1021 } 1022 1023 DumpTimeSharedClassInfo* SystemDictionaryShared::find_or_allocate_info_for(InstanceKlass* k) { 1024 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag); 1025 if (_dumptime_table == NULL) { 1026 _dumptime_table = new (ResourceObj::C_HEAP, mtClass)DumpTimeSharedClassTable(); 1027 } 1028 return _dumptime_table->find_or_allocate_info_for(k); 1029 } 1030 1031 void SystemDictionaryShared::set_shared_class_misc_info(InstanceKlass* k, ClassFileStream* cfs) { 1032 Arguments::assert_is_dumping_archive(); 1033 assert(!is_builtin(k), "must be unregistered class"); 1034 DumpTimeSharedClassInfo* info = find_or_allocate_info_for(k); 1035 info->_clsfile_size = cfs->length(); 1036 info->_clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length()); 1037 } 1038 1039 void SystemDictionaryShared::init_dumptime_info(InstanceKlass* k) { 1040 (void)find_or_allocate_info_for(k); 1041 } 1042 1043 void SystemDictionaryShared::remove_dumptime_info(InstanceKlass* k) { 1044 MutexLocker ml(DumpTimeTable_lock, Mutex::_no_safepoint_check_flag); 1045 DumpTimeSharedClassInfo* p = _dumptime_table->get(k); 1046 if (p == NULL) { 1047 return; 1048 } 1049 if (p->_verifier_constraints != NULL) { 1050 for (int i = 0; i < p->_verifier_constraints->length(); i++) { 1051 DumpTimeSharedClassInfo::DTConstraint constraint = p->_verifier_constraints->at(i); 1052 if (constraint._name != NULL ) { 1053 constraint._name->decrement_refcount(); 1054 } 1055 if (constraint._from_name != NULL ) { 1056 constraint._from_name->decrement_refcount(); 1057 } 1058 } 1059 FREE_C_HEAP_ARRAY(DTConstraint, p->_verifier_constraints); 1060 p->_verifier_constraints = NULL; 1061 } 1062 FREE_C_HEAP_ARRAY(char, p->_verifier_constraint_flags); 1063 p->_verifier_constraint_flags = NULL; 1064 _dumptime_table->remove(k); 1065 } 1066 1067 bool SystemDictionaryShared::is_jfr_event_class(InstanceKlass *k) { 1068 while (k) { 1069 if (k->name()->equals("jdk/internal/event/Event")) { 1070 return true; 1071 } 1072 k = k->java_super(); 1073 } 1074 return false; 1075 } 1076 1077 void SystemDictionaryShared::warn_excluded(InstanceKlass* k, const char* reason) { 1078 ResourceMark rm; 1079 log_warning(cds)("Skipping %s: %s", k->name()->as_C_string(), reason); 1080 } 1081 1082 bool SystemDictionaryShared::should_be_excluded(InstanceKlass* k) { 1083 if (k->class_loader_data()->is_unsafe_anonymous()) { 1084 warn_excluded(k, "Unsafe anonymous class"); 1085 return true; // unsafe anonymous classes are not archived, skip 1086 } 1087 if (k->is_in_error_state()) { 1088 warn_excluded(k, "In error state"); 1089 return true; 1090 } 1091 if (k->shared_classpath_index() < 0 && is_builtin(k)) { 1092 // These are classes loaded from unsupported locations (such as those loaded by JVMTI native 1093 // agent during dump time). 1094 warn_excluded(k, "Unsupported location"); 1095 return true; 1096 } 1097 if (k->signers() != NULL) { 1098 // We cannot include signed classes in the archive because the certificates 1099 // used during dump time may be different than those used during 1100 // runtime (due to expiration, etc). 1101 warn_excluded(k, "Signed JAR"); 1102 return true; 1103 } 1104 if (is_jfr_event_class(k)) { 1105 // We cannot include JFR event classes because they need runtime-specific 1106 // instrumentation in order to work with -XX:FlightRecorderOptions=retransform=false. 1107 // There are only a small number of these classes, so it's not worthwhile to 1108 // support them and make CDS more complicated. 1109 warn_excluded(k, "JFR event class"); 1110 return true; 1111 } 1112 if (k->init_state() < InstanceKlass::linked) { 1113 // In static dumping, we will attempt to link all classes. Those that fail to link will 1114 // be marked as in error state. 1115 assert(DynamicDumpSharedSpaces, "must be"); 1116 1117 // TODO -- rethink how this can be handled. 1118 // We should try to link ik, however, we can't do it here because 1119 // 1. We are at VM exit 1120 // 2. linking a class may cause other classes to be loaded, which means 1121 // a custom ClassLoader.loadClass() may be called, at a point where the 1122 // class loader doesn't expect it. 1123 warn_excluded(k, "Not linked"); 1124 return true; 1125 } 1126 if (k->major_version() < 50 /*JAVA_6_VERSION*/) { 1127 ResourceMark rm; 1128 log_warning(cds)("Pre JDK 6 class not supported by CDS: %u.%u %s", 1129 k->major_version(), k->minor_version(), k->name()->as_C_string()); 1130 return true; 1131 } 1132 1133 InstanceKlass* super = k->java_super(); 1134 if (super != NULL && should_be_excluded(super)) { 1135 ResourceMark rm; 1136 log_warning(cds)("Skipping %s: super class %s is excluded", k->name()->as_C_string(), super->name()->as_C_string()); 1137 return true; 1138 } 1139 1140 Array<InstanceKlass*>* interfaces = k->local_interfaces(); 1141 int len = interfaces->length(); 1142 for (int i = 0; i < len; i++) { 1143 InstanceKlass* intf = interfaces->at(i); 1144 if (should_be_excluded(intf)) { 1145 log_warning(cds)("Skipping %s: interface %s is excluded", k->name()->as_C_string(), intf->name()->as_C_string()); 1146 return true; 1147 } 1148 } 1149 1150 return false; 1151 } 1152 1153 // k is a class before relocating by ArchiveCompactor 1154 void SystemDictionaryShared::validate_before_archiving(InstanceKlass* k) { 1155 ResourceMark rm; 1156 const char* name = k->name()->as_C_string(); 1157 DumpTimeSharedClassInfo* info = _dumptime_table->get(k); 1158 assert(_no_class_loading_should_happen, "class loading must be disabled"); 1159 guarantee(info != NULL, "Class %s must be entered into _dumptime_table", name); 1160 guarantee(!info->is_excluded(), "Should not attempt to archive excluded class %s", name); 1161 if (is_builtin(k)) { 1162 guarantee(k->loader_type() != 0, 1163 "Class loader type must be set for BUILTIN class %s", name); 1164 } else { 1165 guarantee(k->loader_type() == 0, 1166 "Class loader type must not be set for UNREGISTERED class %s", name); 1167 } 1168 } 1169 1170 class ExcludeDumpTimeSharedClasses : StackObj { 1171 public: 1172 bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) { 1173 if (SystemDictionaryShared::should_be_excluded(k)) { 1174 info.set_excluded(); 1175 } 1176 return true; // keep on iterating 1177 } 1178 }; 1179 1180 void SystemDictionaryShared::check_excluded_classes() { 1181 ExcludeDumpTimeSharedClasses excl; 1182 _dumptime_table->iterate(&excl); 1183 _dumptime_table->update_counts(); 1184 } 1185 1186 bool SystemDictionaryShared::is_excluded_class(InstanceKlass* k) { 1187 assert(_no_class_loading_should_happen, "sanity"); 1188 Arguments::assert_is_dumping_archive(); 1189 return find_or_allocate_info_for(k)->is_excluded(); 1190 } 1191 1192 class IterateDumpTimeSharedClassTable : StackObj { 1193 MetaspaceClosure *_it; 1194 public: 1195 IterateDumpTimeSharedClassTable(MetaspaceClosure* it) : _it(it) {} 1196 1197 bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) { 1198 if (!info.is_excluded()) { 1199 info.metaspace_pointers_do(_it); 1200 } 1201 return true; // keep on iterating 1202 } 1203 }; 1204 1205 void SystemDictionaryShared::dumptime_classes_do(class MetaspaceClosure* it) { 1206 IterateDumpTimeSharedClassTable iter(it); 1207 _dumptime_table->iterate(&iter); 1208 } 1209 1210 bool SystemDictionaryShared::add_verification_constraint(InstanceKlass* k, Symbol* name, 1211 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object) { 1212 Arguments::assert_is_dumping_archive(); 1213 DumpTimeSharedClassInfo* info = find_or_allocate_info_for(k); 1214 info->add_verification_constraint(k, name, from_name, from_field_is_protected, 1215 from_is_array, from_is_object); 1216 1217 if (DynamicDumpSharedSpaces) { 1218 // For dynamic dumping, we can resolve all the constraint classes for all class loaders during 1219 // the initial run prior to creating the archive before vm exit. We will also perform verification 1220 // check when running with the archive. 1221 return false; 1222 } else { 1223 if (is_builtin(k)) { 1224 // For builtin class loaders, we can try to complete the verification check at dump time, 1225 // because we can resolve all the constraint classes. We will also perform verification check 1226 // when running with the archive. 1227 return false; 1228 } else { 1229 // For non-builtin class loaders, we cannot complete the verification check at dump time, 1230 // because at dump time we don't know how to resolve classes for such loaders. 1231 return true; 1232 } 1233 } 1234 } 1235 1236 void DumpTimeSharedClassInfo::add_verification_constraint(InstanceKlass* k, Symbol* name, 1237 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object) { 1238 if (_verifier_constraints == NULL) { 1239 _verifier_constraints = new(ResourceObj::C_HEAP, mtClass) GrowableArray<DTConstraint>(4, true, mtClass); 1240 } 1241 if (_verifier_constraint_flags == NULL) { 1242 _verifier_constraint_flags = new(ResourceObj::C_HEAP, mtClass) GrowableArray<char>(4, true, mtClass); 1243 } 1244 GrowableArray<DTConstraint>* vc_array = _verifier_constraints; 1245 for (int i = 0; i < vc_array->length(); i++) { 1246 DTConstraint* p = vc_array->adr_at(i); 1247 if (name == p->_name && from_name == p->_from_name) { 1248 return; 1249 } 1250 } 1251 DTConstraint cons(name, from_name); 1252 vc_array->append(cons); 1253 1254 GrowableArray<char>* vcflags_array = _verifier_constraint_flags; 1255 char c = 0; 1256 c |= from_field_is_protected ? SystemDictionaryShared::FROM_FIELD_IS_PROTECTED : 0; 1257 c |= from_is_array ? SystemDictionaryShared::FROM_IS_ARRAY : 0; 1258 c |= from_is_object ? SystemDictionaryShared::FROM_IS_OBJECT : 0; 1259 vcflags_array->append(c); 1260 1261 if (log_is_enabled(Trace, cds, verification)) { 1262 ResourceMark rm; 1263 log_trace(cds, verification)("add_verification_constraint: %s: %s must be subclass of %s [0x%x]", 1264 k->external_name(), from_name->as_klass_external_name(), 1265 name->as_klass_external_name(), c); 1266 } 1267 } 1268 1269 void SystemDictionaryShared::check_verification_constraints(InstanceKlass* klass, 1270 TRAPS) { 1271 assert(!DumpSharedSpaces && UseSharedSpaces, "called at run time with CDS enabled only"); 1272 RunTimeSharedClassInfo* record = RunTimeSharedClassInfo::get_for(klass); 1273 1274 int length = record->_num_constraints; 1275 if (length > 0) { 1276 for (int i = 0; i < length; i++) { 1277 Symbol* name = record->get_constraint_name(i); 1278 Symbol* from_name = record->get_constraint_from_name(i); 1279 char c = record->get_constraint_flag(i); 1280 1281 if (log_is_enabled(Trace, cds, verification)) { 1282 ResourceMark rm(THREAD); 1283 log_trace(cds, verification)("check_verification_constraint: %s: %s must be subclass of %s [0x%x]", 1284 klass->external_name(), from_name->as_klass_external_name(), 1285 name->as_klass_external_name(), c); 1286 } 1287 1288 bool from_field_is_protected = (c & SystemDictionaryShared::FROM_FIELD_IS_PROTECTED) ? true : false; 1289 bool from_is_array = (c & SystemDictionaryShared::FROM_IS_ARRAY) ? true : false; 1290 bool from_is_object = (c & SystemDictionaryShared::FROM_IS_OBJECT) ? true : false; 1291 1292 bool ok = VerificationType::resolve_and_check_assignability(klass, name, 1293 from_name, from_field_is_protected, from_is_array, from_is_object, CHECK); 1294 if (!ok) { 1295 ResourceMark rm(THREAD); 1296 stringStream ss; 1297 1298 ss.print_cr("Bad type on operand stack"); 1299 ss.print_cr("Exception Details:"); 1300 ss.print_cr(" Location:\n %s", klass->name()->as_C_string()); 1301 ss.print_cr(" Reason:\n Type '%s' is not assignable to '%s'", 1302 from_name->as_quoted_ascii(), name->as_quoted_ascii()); 1303 THROW_MSG(vmSymbols::java_lang_VerifyError(), ss.as_string()); 1304 } 1305 } 1306 } 1307 } 1308 1309 class EstimateSizeForArchive : StackObj { 1310 size_t _shared_class_info_size; 1311 int _num_builtin_klasses; 1312 int _num_unregistered_klasses; 1313 1314 public: 1315 EstimateSizeForArchive() { 1316 _shared_class_info_size = 0; 1317 _num_builtin_klasses = 0; 1318 _num_unregistered_klasses = 0; 1319 } 1320 1321 bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) { 1322 if (!info.is_excluded()) { 1323 size_t byte_size = RunTimeSharedClassInfo::byte_size(info._klass, info.num_constraints()); 1324 _shared_class_info_size += align_up(byte_size, BytesPerWord); 1325 } 1326 return true; // keep on iterating 1327 } 1328 1329 size_t total() { 1330 return _shared_class_info_size; 1331 } 1332 }; 1333 1334 size_t SystemDictionaryShared::estimate_size_for_archive() { 1335 EstimateSizeForArchive est; 1336 _dumptime_table->iterate(&est); 1337 return est.total() + 1338 CompactHashtableWriter::estimate_size(_dumptime_table->count_of(true)) + 1339 CompactHashtableWriter::estimate_size(_dumptime_table->count_of(false)); 1340 } 1341 1342 class CopySharedClassInfoToArchive : StackObj { 1343 CompactHashtableWriter* _writer; 1344 bool _is_builtin; 1345 public: 1346 CopySharedClassInfoToArchive(CompactHashtableWriter* writer, 1347 bool is_builtin, 1348 bool is_static_archive) 1349 : _writer(writer), _is_builtin(is_builtin) {} 1350 1351 bool do_entry(InstanceKlass* k, DumpTimeSharedClassInfo& info) { 1352 if (!info.is_excluded() && info.is_builtin() == _is_builtin) { 1353 size_t byte_size = RunTimeSharedClassInfo::byte_size(info._klass, info.num_constraints()); 1354 RunTimeSharedClassInfo* record; 1355 record = (RunTimeSharedClassInfo*)MetaspaceShared::read_only_space_alloc(byte_size); 1356 record->init(info); 1357 1358 unsigned int hash; 1359 Symbol* name = info._klass->name(); 1360 if (DynamicDumpSharedSpaces) { 1361 name = DynamicArchive::original_to_target(name); 1362 } 1363 hash = primitive_hash<Symbol*>(name); 1364 u4 delta; 1365 if (DynamicDumpSharedSpaces) { 1366 delta = MetaspaceShared::object_delta_u4(DynamicArchive::buffer_to_target(record)); 1367 } else { 1368 delta = MetaspaceShared::object_delta_u4(record); 1369 } 1370 _writer->add(hash, delta); 1371 if (log_is_enabled(Trace, cds, hashtables)) { 1372 ResourceMark rm; 1373 log_trace(cds,hashtables)("%s dictionary: %s", (_is_builtin ? "builtin" : "unregistered"), info._klass->external_name()); 1374 } 1375 1376 // Save this for quick runtime lookup of InstanceKlass* -> RunTimeSharedClassInfo* 1377 RunTimeSharedClassInfo::set_for(info._klass, record); 1378 } 1379 return true; // keep on iterating 1380 } 1381 }; 1382 1383 void SystemDictionaryShared::write_dictionary(RunTimeSharedDictionary* dictionary, 1384 bool is_builtin, 1385 bool is_static_archive) { 1386 CompactHashtableStats stats; 1387 dictionary->reset(); 1388 CompactHashtableWriter writer(_dumptime_table->count_of(is_builtin), &stats); 1389 CopySharedClassInfoToArchive copy(&writer, is_builtin, is_static_archive); 1390 _dumptime_table->iterate(©); 1391 writer.dump(dictionary, is_builtin ? "builtin dictionary" : "unregistered dictionary"); 1392 } 1393 1394 void SystemDictionaryShared::write_to_archive(bool is_static_archive) { 1395 if (is_static_archive) { 1396 write_dictionary(&_builtin_dictionary, true); 1397 write_dictionary(&_unregistered_dictionary, false); 1398 } else { 1399 write_dictionary(&_dynamic_builtin_dictionary, true); 1400 write_dictionary(&_dynamic_unregistered_dictionary, false); 1401 } 1402 } 1403 1404 void SystemDictionaryShared::serialize_dictionary_headers(SerializeClosure* soc, 1405 bool is_static_archive) { 1406 if (is_static_archive) { 1407 _builtin_dictionary.serialize_header(soc); 1408 _unregistered_dictionary.serialize_header(soc); 1409 } else { 1410 _dynamic_builtin_dictionary.serialize_header(soc); 1411 _dynamic_unregistered_dictionary.serialize_header(soc); 1412 } 1413 } 1414 1415 const RunTimeSharedClassInfo* 1416 SystemDictionaryShared::find_record(RunTimeSharedDictionary* dict, Symbol* name) { 1417 if (UseSharedSpaces) { 1418 unsigned int hash = primitive_hash<Symbol*>(name); 1419 return dict->lookup(name, hash, 0); 1420 } else { 1421 return NULL; 1422 } 1423 } 1424 1425 InstanceKlass* SystemDictionaryShared::find_builtin_class(Symbol* name) { 1426 const RunTimeSharedClassInfo* record = find_record(&_builtin_dictionary, name); 1427 if (record) { 1428 return record->_klass; 1429 } 1430 1431 if (DynamicArchive::is_mapped()) { 1432 record = find_record(&_dynamic_builtin_dictionary, name); 1433 if (record) { 1434 return record->_klass; 1435 } 1436 } 1437 1438 return NULL; 1439 } 1440 1441 void SystemDictionaryShared::update_shared_entry(InstanceKlass* k, int id) { 1442 assert(DumpSharedSpaces, "supported only when dumping"); 1443 DumpTimeSharedClassInfo* info = find_or_allocate_info_for(k); 1444 info->_id = id; 1445 } 1446 1447 class SharedDictionaryPrinter : StackObj { 1448 outputStream* _st; 1449 int _index; 1450 public: 1451 SharedDictionaryPrinter(outputStream* st) : _st(st), _index(0) {} 1452 1453 void do_value(const RunTimeSharedClassInfo* record) { 1454 ResourceMark rm; 1455 _st->print_cr("%4d: %s", (_index++), record->_klass->external_name()); 1456 } 1457 }; 1458 1459 void SystemDictionaryShared::print_on(outputStream* st) { 1460 if (UseSharedSpaces) { 1461 st->print_cr("Shared Dictionary"); 1462 SharedDictionaryPrinter p(st); 1463 _builtin_dictionary.iterate(&p); 1464 _unregistered_dictionary.iterate(&p); 1465 if (DynamicArchive::is_mapped()) { 1466 _dynamic_builtin_dictionary.iterate(&p); 1467 _unregistered_dictionary.iterate(&p); 1468 } 1469 } 1470 } 1471 1472 void SystemDictionaryShared::print_table_statistics(outputStream* st) { 1473 if (UseSharedSpaces) { 1474 _builtin_dictionary.print_table_statistics(st, "Builtin Shared Dictionary"); 1475 _unregistered_dictionary.print_table_statistics(st, "Unregistered Shared Dictionary"); 1476 if (DynamicArchive::is_mapped()) { 1477 _dynamic_builtin_dictionary.print_table_statistics(st, "Dynamic Builtin Shared Dictionary"); 1478 _dynamic_unregistered_dictionary.print_table_statistics(st, "Unregistered Shared Dictionary"); 1479 } 1480 } 1481 } 1482 1483 bool SystemDictionaryShared::empty_dumptime_table() { 1484 if (_dumptime_table == NULL) { 1485 return true; 1486 } 1487 _dumptime_table->update_counts(); 1488 if (_dumptime_table->count_of(true) == 0 && _dumptime_table->count_of(false) == 0){ 1489 return true; 1490 } 1491 return false; 1492 }