1 /* 2 * Copyright (c) 2014, 2018, 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/classLoaderExt.hpp" 31 #include "classfile/compactHashtable.inline.hpp" 32 #include "classfile/dictionary.hpp" 33 #include "classfile/javaClasses.hpp" 34 #include "classfile/sharedClassUtil.hpp" 35 #include "classfile/symbolTable.hpp" 36 #include "classfile/systemDictionary.hpp" 37 #include "classfile/systemDictionaryShared.hpp" 38 #include "classfile/verificationType.hpp" 39 #include "classfile/vmSymbols.hpp" 40 #include "logging/log.hpp" 41 #include "memory/allocation.hpp" 42 #include "memory/filemap.hpp" 43 #include "memory/metadataFactory.hpp" 44 #include "memory/metaspaceClosure.hpp" 45 #include "memory/oopFactory.hpp" 46 #include "memory/resourceArea.hpp" 47 #include "oops/instanceKlass.hpp" 48 #include "oops/klass.inline.hpp" 49 #include "oops/objArrayOop.inline.hpp" 50 #include "oops/oop.inline.hpp" 51 #include "oops/typeArrayOop.inline.hpp" 52 #include "runtime/handles.inline.hpp" 53 #include "runtime/java.hpp" 54 #include "runtime/javaCalls.hpp" 55 #include "runtime/mutexLocker.hpp" 56 #include "utilities/hashtable.inline.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 64 static Mutex* SharedDictionary_lock = NULL; 65 66 void SystemDictionaryShared::initialize(TRAPS) { 67 if (_java_system_loader != NULL) { 68 SharedDictionary_lock = new Mutex(Mutex::leaf, "SharedDictionary_lock", true); 69 70 // These classes need to be initialized before calling get_shared_jar_manifest(), etc. 71 SystemDictionary::ByteArrayInputStream_klass()->initialize(CHECK); 72 SystemDictionary::File_klass()->initialize(CHECK); 73 SystemDictionary::Jar_Manifest_klass()->initialize(CHECK); 74 SystemDictionary::CodeSource_klass()->initialize(CHECK); 75 } 76 } 77 78 oop SystemDictionaryShared::shared_protection_domain(int index) { 79 return _shared_protection_domains->obj_at(index); 80 } 81 82 oop SystemDictionaryShared::shared_jar_url(int index) { 83 return _shared_jar_urls->obj_at(index); 84 } 85 86 oop SystemDictionaryShared::shared_jar_manifest(int index) { 87 return _shared_jar_manifests->obj_at(index); 88 } 89 90 91 Handle SystemDictionaryShared::get_shared_jar_manifest(int shared_path_index, TRAPS) { 92 Handle empty; 93 Handle manifest ; 94 if (shared_jar_manifest(shared_path_index) == NULL) { 95 SharedClassPathEntryExt* ent = (SharedClassPathEntryExt*)FileMapInfo::shared_classpath(shared_path_index); 96 long size = ent->manifest_size(); 97 if (size <= 0) { 98 return empty; // No manifest - return NULL handle 99 } 100 101 // ByteArrayInputStream bais = new ByteArrayInputStream(buf); 102 InstanceKlass* bais_klass = SystemDictionary::ByteArrayInputStream_klass(); 103 Handle bais = bais_klass->allocate_instance_handle(CHECK_(empty)); 104 { 105 const char* src = ent->manifest(); 106 assert(src != NULL, "No Manifest data"); 107 typeArrayOop buf = oopFactory::new_byteArray(size, CHECK_(empty)); 108 typeArrayHandle bufhandle(THREAD, buf); 109 char* dst = (char*)(buf->byte_at_addr(0)); 110 memcpy(dst, src, (size_t)size); 111 112 JavaValue result(T_VOID); 113 JavaCalls::call_special(&result, bais, bais_klass, 114 vmSymbols::object_initializer_name(), 115 vmSymbols::byte_array_void_signature(), 116 bufhandle, CHECK_(empty)); 117 } 118 119 // manifest = new Manifest(bais) 120 InstanceKlass* manifest_klass = SystemDictionary::Jar_Manifest_klass(); 121 manifest = manifest_klass->allocate_instance_handle(CHECK_(empty)); 122 { 123 JavaValue result(T_VOID); 124 JavaCalls::call_special(&result, manifest, manifest_klass, 125 vmSymbols::object_initializer_name(), 126 vmSymbols::input_stream_void_signature(), 127 bais, CHECK_(empty)); 128 } 129 atomic_set_shared_jar_manifest(shared_path_index, manifest()); 130 } 131 132 manifest = Handle(THREAD, shared_jar_manifest(shared_path_index)); 133 assert(manifest.not_null(), "sanity"); 134 return manifest; 135 } 136 137 Handle SystemDictionaryShared::get_shared_jar_url(int shared_path_index, TRAPS) { 138 Handle url_h; 139 if (shared_jar_url(shared_path_index) == NULL) { 140 JavaValue result(T_OBJECT); 141 const char* path = FileMapInfo::shared_classpath_name(shared_path_index); 142 Handle path_string = java_lang_String::create_from_str(path, CHECK_(url_h)); 143 Klass* classLoaders_klass = 144 SystemDictionary::jdk_internal_loader_ClassLoaders_klass(); 145 JavaCalls::call_static(&result, classLoaders_klass, 146 vmSymbols::toFileURL_name(), 147 vmSymbols::toFileURL_signature(), 148 path_string, CHECK_(url_h)); 149 150 atomic_set_shared_jar_url(shared_path_index, (oop)result.get_jobject()); 151 } 152 153 url_h = Handle(THREAD, shared_jar_url(shared_path_index)); 154 assert(url_h.not_null(), "sanity"); 155 return url_h; 156 } 157 158 Handle SystemDictionaryShared::get_package_name(Symbol* class_name, TRAPS) { 159 ResourceMark rm(THREAD); 160 Handle pkgname_string; 161 char* pkgname = (char*) ClassLoader::package_from_name((const char*) class_name->as_C_string()); 162 if (pkgname != NULL) { // Package prefix found 163 StringUtils::replace_no_expand(pkgname, "/", "."); 164 pkgname_string = java_lang_String::create_from_str(pkgname, 165 CHECK_(pkgname_string)); 166 } 167 return pkgname_string; 168 } 169 170 // Define Package for shared app classes from JAR file and also checks for 171 // package sealing (all done in Java code) 172 // See http://docs.oracle.com/javase/tutorial/deployment/jar/sealman.html 173 void SystemDictionaryShared::define_shared_package(Symbol* class_name, 174 Handle class_loader, 175 Handle manifest, 176 Handle url, 177 TRAPS) { 178 assert(class_loader == _java_system_loader, "unexpected class loader"); 179 // get_package_name() returns a NULL handle if the class is in unnamed package 180 Handle pkgname_string = get_package_name(class_name, CHECK); 181 if (pkgname_string.not_null()) { 182 Klass* app_classLoader_klass = SystemDictionary::jdk_internal_loader_ClassLoaders_AppClassLoader_klass(); 183 JavaValue result(T_OBJECT); 184 JavaCallArguments args(3); 185 args.set_receiver(class_loader); 186 args.push_oop(pkgname_string); 187 args.push_oop(manifest); 188 args.push_oop(url); 189 JavaCalls::call_virtual(&result, app_classLoader_klass, 190 vmSymbols::defineOrCheckPackage_name(), 191 vmSymbols::defineOrCheckPackage_signature(), 192 &args, 193 CHECK); 194 } 195 } 196 197 // Define Package for shared app/platform classes from named module 198 void SystemDictionaryShared::define_shared_package(Symbol* class_name, 199 Handle class_loader, 200 ModuleEntry* mod_entry, 201 TRAPS) { 202 assert(mod_entry != NULL, "module_entry should not be NULL"); 203 Handle module_handle(THREAD, mod_entry->module()); 204 205 Handle pkg_name = get_package_name(class_name, CHECK); 206 assert(pkg_name.not_null(), "Package should not be null for class in named module"); 207 208 Klass* classLoader_klass; 209 if (SystemDictionary::is_system_class_loader(class_loader())) { 210 classLoader_klass = SystemDictionary::jdk_internal_loader_ClassLoaders_AppClassLoader_klass(); 211 } else { 212 assert(SystemDictionary::is_platform_class_loader(class_loader()), "unexpected classloader"); 213 classLoader_klass = SystemDictionary::jdk_internal_loader_ClassLoaders_PlatformClassLoader_klass(); 214 } 215 216 JavaValue result(T_OBJECT); 217 JavaCallArguments args(2); 218 args.set_receiver(class_loader); 219 args.push_oop(pkg_name); 220 args.push_oop(module_handle); 221 JavaCalls::call_virtual(&result, classLoader_klass, 222 vmSymbols::definePackage_name(), 223 vmSymbols::definePackage_signature(), 224 &args, 225 CHECK); 226 } 227 228 // Get the ProtectionDomain associated with the CodeSource from the classloader. 229 Handle SystemDictionaryShared::get_protection_domain_from_classloader(Handle class_loader, 230 Handle url, TRAPS) { 231 // CodeSource cs = new CodeSource(url, null); 232 InstanceKlass* cs_klass = SystemDictionary::CodeSource_klass(); 233 Handle cs = cs_klass->allocate_instance_handle(CHECK_NH); 234 JavaValue void_result(T_VOID); 235 JavaCalls::call_special(&void_result, cs, cs_klass, 236 vmSymbols::object_initializer_name(), 237 vmSymbols::url_code_signer_array_void_signature(), 238 url, Handle(), CHECK_NH); 239 240 // protection_domain = SecureClassLoader.getProtectionDomain(cs); 241 Klass* secureClassLoader_klass = SystemDictionary::SecureClassLoader_klass(); 242 JavaValue obj_result(T_OBJECT); 243 JavaCalls::call_virtual(&obj_result, class_loader, secureClassLoader_klass, 244 vmSymbols::getProtectionDomain_name(), 245 vmSymbols::getProtectionDomain_signature(), 246 cs, CHECK_NH); 247 return Handle(THREAD, (oop)obj_result.get_jobject()); 248 } 249 250 // Returns the ProtectionDomain associated with the JAR file identified by the url. 251 Handle SystemDictionaryShared::get_shared_protection_domain(Handle class_loader, 252 int shared_path_index, 253 Handle url, 254 TRAPS) { 255 Handle protection_domain; 256 if (shared_protection_domain(shared_path_index) == NULL) { 257 Handle pd = get_protection_domain_from_classloader(class_loader, url, THREAD); 258 atomic_set_shared_protection_domain(shared_path_index, pd()); 259 } 260 261 // Acquire from the cache because if another thread beats the current one to 262 // set the shared protection_domain and the atomic_set fails, the current thread 263 // needs to get the updated protection_domain from the cache. 264 protection_domain = Handle(THREAD, shared_protection_domain(shared_path_index)); 265 assert(protection_domain.not_null(), "sanity"); 266 return protection_domain; 267 } 268 269 // Returns the ProtectionDomain associated with the moduleEntry. 270 Handle SystemDictionaryShared::get_shared_protection_domain(Handle class_loader, 271 ModuleEntry* mod, TRAPS) { 272 ClassLoaderData *loader_data = mod->loader_data(); 273 Handle protection_domain; 274 if (mod->shared_protection_domain() == NULL) { 275 Symbol* location = mod->location(); 276 if (location != NULL) { 277 Handle url_string = java_lang_String::create_from_symbol( 278 location, CHECK_(protection_domain)); 279 JavaValue result(T_OBJECT); 280 Klass* classLoaders_klass = 281 SystemDictionary::jdk_internal_loader_ClassLoaders_klass(); 282 JavaCalls::call_static(&result, classLoaders_klass, vmSymbols::toFileURL_name(), 283 vmSymbols::toFileURL_signature(), 284 url_string, CHECK_(protection_domain)); 285 Handle url = Handle(THREAD, (oop)result.get_jobject()); 286 287 Handle pd = get_protection_domain_from_classloader(class_loader, url, THREAD); 288 mod->set_shared_protection_domain(loader_data, pd); 289 } 290 } 291 292 protection_domain = Handle(THREAD, mod->shared_protection_domain()); 293 assert(protection_domain.not_null(), "sanity"); 294 return protection_domain; 295 } 296 297 // Initializes the java.lang.Package and java.security.ProtectionDomain objects associated with 298 // the given InstanceKlass. 299 // Returns the ProtectionDomain for the InstanceKlass. 300 Handle SystemDictionaryShared::init_security_info(Handle class_loader, InstanceKlass* ik, TRAPS) { 301 Handle pd; 302 303 if (ik != NULL) { 304 int index = ik->shared_classpath_index(); 305 assert(index >= 0, "Sanity"); 306 SharedClassPathEntryExt* ent = 307 (SharedClassPathEntryExt*)FileMapInfo::shared_classpath(index); 308 Symbol* class_name = ik->name(); 309 310 if (ent->is_modules_image()) { 311 // For shared app/platform classes originated from the run-time image: 312 // The ProtectionDomains are cached in the corresponding ModuleEntries 313 // for fast access by the VM. 314 ResourceMark rm; 315 ClassLoaderData *loader_data = 316 ClassLoaderData::class_loader_data(class_loader()); 317 PackageEntryTable* pkgEntryTable = loader_data->packages(); 318 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK_(pd)); 319 if (pkg_name != NULL) { 320 PackageEntry* pkg_entry = pkgEntryTable->lookup_only(pkg_name); 321 if (pkg_entry != NULL) { 322 ModuleEntry* mod_entry = pkg_entry->module(); 323 pd = get_shared_protection_domain(class_loader, mod_entry, THREAD); 324 define_shared_package(class_name, class_loader, mod_entry, CHECK_(pd)); 325 } 326 } 327 } else { 328 // For shared app/platform classes originated from JAR files on the class path: 329 // Each of the 3 SystemDictionaryShared::_shared_xxx arrays has the same length 330 // as the shared classpath table in the shared archive (see 331 // FileMap::_classpath_entry_table in filemap.hpp for details). 332 // 333 // If a shared InstanceKlass k is loaded from the class path, let 334 // 335 // index = k->shared_classpath_index(): 336 // 337 // FileMap::_classpath_entry_table[index] identifies the JAR file that contains k. 338 // 339 // k's protection domain is: 340 // 341 // ProtectionDomain pd = _shared_protection_domains[index]; 342 // 343 // and k's Package is initialized using 344 // 345 // manifest = _shared_jar_manifests[index]; 346 // url = _shared_jar_urls[index]; 347 // define_shared_package(class_name, class_loader, manifest, url, CHECK_(pd)); 348 // 349 // Note that if an element of these 3 _shared_xxx arrays is NULL, it will be initialized by 350 // the corresponding SystemDictionaryShared::get_shared_xxx() function. 351 Handle manifest = get_shared_jar_manifest(index, CHECK_(pd)); 352 Handle url = get_shared_jar_url(index, CHECK_(pd)); 353 define_shared_package(class_name, class_loader, manifest, url, CHECK_(pd)); 354 pd = get_shared_protection_domain(class_loader, index, url, CHECK_(pd)); 355 } 356 } 357 return pd; 358 } 359 360 // Currently AppCDS only archives classes from the run-time image, the 361 // -Xbootclasspath/a path, and the class path. The following rules need to be 362 // revised when AppCDS is changed to archive classes from other code sources 363 // in the future, for example the module path (specified by -p). 364 // 365 // Check if a shared class can be loaded by the specific classloader. Following 366 // are the "visible" archived classes for different classloaders. 367 // 368 // NULL classloader: 369 // - see SystemDictionary::is_shared_class_visible() 370 // Platform classloader: 371 // - Module class from "modules" jimage. ModuleEntry must be defined in the 372 // classloader. 373 // App Classloader: 374 // - Module class from "modules" jimage. ModuleEntry must be defined in the 375 // classloader. 376 // - Class from -cp. The class must have no PackageEntry defined in any of the 377 // boot/platform/app classloader, or must be in the unnamed module defined in the 378 // AppClassLoader. 379 bool SystemDictionaryShared::is_shared_class_visible_for_classloader( 380 InstanceKlass* ik, 381 Handle class_loader, 382 const char* pkg_string, 383 Symbol* pkg_name, 384 PackageEntry* pkg_entry, 385 ModuleEntry* mod_entry, 386 TRAPS) { 387 assert(class_loader.not_null(), "Class loader should not be NULL"); 388 assert(Universe::is_module_initialized(), "Module system is not initialized"); 389 390 int path_index = ik->shared_classpath_index(); 391 SharedClassPathEntry* ent = 392 (SharedClassPathEntry*)FileMapInfo::shared_classpath(path_index); 393 394 if (SystemDictionary::is_platform_class_loader(class_loader())) { 395 assert(ent != NULL, "shared class for PlatformClassLoader should have valid SharedClassPathEntry"); 396 // The PlatformClassLoader can only load archived class originated from the 397 // run-time image. The class' PackageEntry/ModuleEntry must be 398 // defined by the PlatformClassLoader. 399 if (mod_entry != NULL) { 400 // PackageEntry/ModuleEntry is found in the classloader. Check if the 401 // ModuleEntry's location agrees with the archived class' origination. 402 if (ent->is_modules_image() && mod_entry->location()->starts_with("jrt:")) { 403 return true; // Module class from the "modules" jimage 404 } 405 } 406 } else if (SystemDictionary::is_system_class_loader(class_loader())) { 407 assert(ent != NULL, "shared class for system loader should have valid SharedClassPathEntry"); 408 if (pkg_string == NULL) { 409 // The archived class is in the unnamed package. Currently, the boot image 410 // does not contain any class in the unnamed package. 411 assert(!ent->is_modules_image(), "Class in the unnamed package must be from the classpath"); 412 if (path_index >= ClassLoaderExt::app_paths_start_index()) { 413 return true; 414 } 415 } else { 416 // Check if this is from a PackageEntry/ModuleEntry defined in the AppClassloader. 417 if (pkg_entry == NULL) { 418 // It's not guaranteed that the class is from the classpath if the 419 // PackageEntry cannot be found from the AppClassloader. Need to check 420 // the boot and platform classloader as well. 421 if (get_package_entry(pkg_name, ClassLoaderData::class_loader_data_or_null(SystemDictionary::java_platform_loader())) == NULL && 422 get_package_entry(pkg_name, ClassLoaderData::the_null_class_loader_data()) == NULL) { 423 // The PackageEntry is not defined in any of the boot/platform/app classloaders. 424 // The archived class must from -cp path and not from the run-time image. 425 if (!ent->is_modules_image() && path_index >= ClassLoaderExt::app_paths_start_index()) { 426 return true; 427 } 428 } 429 } else if (mod_entry != NULL) { 430 // The package/module is defined in the AppClassLoader. Currently we only 431 // support archiving application module class from the run-time image. 432 // Packages from the -cp path are in the unnamed_module. 433 if ((ent->is_modules_image() && mod_entry->location()->starts_with("jrt:")) || 434 (pkg_entry->in_unnamed_module() && path_index >= ClassLoaderExt::app_paths_start_index())) { 435 DEBUG_ONLY( \ 436 ClassLoaderData* loader_data = class_loader_data(class_loader); \ 437 if (pkg_entry->in_unnamed_module()) \ 438 assert(mod_entry == loader_data->unnamed_module(), "the unnamed module is not defined in the classloader");) 439 440 return true; 441 } 442 } 443 } 444 } else { 445 // TEMP: if a shared class can be found by a custom loader, consider it visible now. 446 // FIXME: is this actually correct? 447 return true; 448 } 449 return false; 450 } 451 452 // The following stack shows how this code is reached: 453 // 454 // [0] SystemDictionaryShared::find_or_load_shared_class() 455 // [1] JVM_FindLoadedClass 456 // [2] java.lang.ClassLoader.findLoadedClass0() 457 // [3] java.lang.ClassLoader.findLoadedClass() 458 // [4] java.lang.ClassLoader.loadClass() 459 // [5] jdk.internal.loader.ClassLoaders$AppClassLoader_klass.loadClass() 460 // 461 // Because AppCDS supports only the PlatformClassLoader and AppClassLoader, we make the following 462 // assumptions (based on the JDK 8.0 source code): 463 // 464 // [a] these two loaders use the default implementation of 465 // ClassLoader.loadClass(String name, boolean resolve), which 466 // [b] calls findLoadedClass(name), immediately followed by parent.loadClass(), 467 // immediately followed by findClass(name). 468 // [c] If the requested class is a shared class of the current class loader, parent.loadClass() 469 // always returns null, and 470 // [d] if AppCDS is not enabled, the class would be loaded by findClass() by decoding it from a 471 // JAR file and then parsed. 472 // 473 // Given these assumptions, we intercept the findLoadedClass() call to invoke 474 // SystemDictionaryShared::find_or_load_shared_class() to load the shared class from 475 // the archive. The reasons are: 476 // 477 // + Because AppCDS is a commercial feature, we want to hide the implementation. There 478 // is currently no easy way to hide Java code, so we did it with native code. 479 // + Start-up is improved because we avoid decoding the JAR file, and avoid delegating 480 // to the parent (since we know the parent will not find this class). 481 // 482 // NOTE: there's a lot of assumption about the Java code. If any of that change, this 483 // needs to be redesigned. 484 // 485 // An alternative is to modify the Java code of AppClassLoader.loadClass(). 486 // 487 InstanceKlass* SystemDictionaryShared::find_or_load_shared_class( 488 Symbol* name, Handle class_loader, TRAPS) { 489 if (DumpSharedSpaces) { 490 return NULL; 491 } 492 493 InstanceKlass* k = NULL; 494 if (shared_dictionary() != NULL && 495 UseAppCDS && (SystemDictionary::is_system_class_loader(class_loader()) || 496 SystemDictionary::is_platform_class_loader(class_loader()))) { 497 498 // Fix for 4474172; see evaluation for more details 499 class_loader = Handle( 500 THREAD, java_lang_ClassLoader::non_reflection_class_loader(class_loader())); 501 ClassLoaderData *loader_data = register_loader(class_loader); 502 Dictionary* dictionary = loader_data->dictionary(); 503 504 unsigned int d_hash = dictionary->compute_hash(name); 505 506 bool DoObjectLock = true; 507 if (is_parallelCapable(class_loader)) { 508 DoObjectLock = false; 509 } 510 511 // Make sure we are synchronized on the class loader before we proceed 512 // 513 // Note: currently, find_or_load_shared_class is called only from 514 // JVM_FindLoadedClass and used for PlatformClassLoader and AppClassLoader, 515 // which are parallel-capable loaders, so this lock is NOT taken. 516 Handle lockObject = compute_loader_lock_object(class_loader, THREAD); 517 check_loader_lock_contention(lockObject, THREAD); 518 ObjectLocker ol(lockObject, THREAD, DoObjectLock); 519 520 { 521 MutexLocker mu(SystemDictionary_lock, THREAD); 522 Klass* check = find_class(d_hash, name, dictionary); 523 if (check != NULL) { 524 return InstanceKlass::cast(check); 525 } 526 } 527 528 k = load_shared_class_for_builtin_loader(name, class_loader, THREAD); 529 if (k != NULL) { 530 define_instance_class(k, CHECK_NULL); 531 } 532 } 533 534 return k; 535 } 536 537 InstanceKlass* SystemDictionaryShared::load_shared_class_for_builtin_loader( 538 Symbol* class_name, Handle class_loader, TRAPS) { 539 assert(UseAppCDS && shared_dictionary() != NULL, "already checked"); 540 Klass* k = shared_dictionary()->find_class_for_builtin_loader(class_name); 541 542 if (k != NULL) { 543 InstanceKlass* ik = InstanceKlass::cast(k); 544 if ((ik->is_shared_app_class() && 545 SystemDictionary::is_system_class_loader(class_loader())) || 546 (ik->is_shared_platform_class() && 547 SystemDictionary::is_platform_class_loader(class_loader()))) { 548 Handle protection_domain = 549 SystemDictionaryShared::init_security_info(class_loader, ik, CHECK_NULL); 550 return load_shared_class(ik, class_loader, protection_domain, THREAD); 551 } 552 } 553 554 return NULL; 555 } 556 557 void SystemDictionaryShared::oops_do(OopClosure* f) { 558 f->do_oop((oop*)&_shared_protection_domains); 559 f->do_oop((oop*)&_shared_jar_urls); 560 f->do_oop((oop*)&_shared_jar_manifests); 561 } 562 563 void SystemDictionaryShared::allocate_shared_protection_domain_array(int size, TRAPS) { 564 if (_shared_protection_domains == NULL) { 565 _shared_protection_domains = oopFactory::new_objArray( 566 SystemDictionary::ProtectionDomain_klass(), size, CHECK); 567 } 568 } 569 570 void SystemDictionaryShared::allocate_shared_jar_url_array(int size, TRAPS) { 571 if (_shared_jar_urls == NULL) { 572 _shared_jar_urls = oopFactory::new_objArray( 573 SystemDictionary::URL_klass(), size, CHECK); 574 } 575 } 576 577 void SystemDictionaryShared::allocate_shared_jar_manifest_array(int size, TRAPS) { 578 if (_shared_jar_manifests == NULL) { 579 _shared_jar_manifests = oopFactory::new_objArray( 580 SystemDictionary::Jar_Manifest_klass(), size, CHECK); 581 } 582 } 583 584 void SystemDictionaryShared::allocate_shared_data_arrays(int size, TRAPS) { 585 allocate_shared_protection_domain_array(size, CHECK); 586 allocate_shared_jar_url_array(size, CHECK); 587 allocate_shared_jar_manifest_array(size, CHECK); 588 } 589 590 591 InstanceKlass* SystemDictionaryShared::lookup_from_stream(const Symbol* class_name, 592 Handle class_loader, 593 Handle protection_domain, 594 const ClassFileStream* cfs, 595 TRAPS) { 596 if (!UseAppCDS || shared_dictionary() == NULL) { 597 return NULL; 598 } 599 if (class_name == NULL) { // don't do this for anonymous classes 600 return NULL; 601 } 602 if (class_loader.is_null() || 603 SystemDictionary::is_system_class_loader(class_loader()) || 604 SystemDictionary::is_platform_class_loader(class_loader())) { 605 // This function is called for loading only UNREGISTERED classes. 606 // Do nothing for the BUILTIN loaders. 607 return NULL; 608 } 609 610 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader()); 611 Klass* k; 612 613 { // UNREGISTERED loader 614 if (!shared_dictionary()->class_exists_for_unregistered_loader(class_name)) { 615 // No classes of this name for unregistered loaders. 616 return NULL; 617 } 618 619 int clsfile_size = cfs->length(); 620 int clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length()); 621 622 k = shared_dictionary()->find_class_for_unregistered_loader(class_name, 623 clsfile_size, clsfile_crc32); 624 } 625 626 if (k == NULL) { // not archived 627 return NULL; 628 } 629 630 return acquire_class_for_current_thread(InstanceKlass::cast(k), class_loader, 631 protection_domain, THREAD); 632 } 633 634 InstanceKlass* SystemDictionaryShared::acquire_class_for_current_thread( 635 InstanceKlass *ik, 636 Handle class_loader, 637 Handle protection_domain, 638 TRAPS) { 639 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data(class_loader()); 640 641 { 642 MutexLocker mu(SharedDictionary_lock, THREAD); 643 if (ik->class_loader_data() != NULL) { 644 // ik is already loaded (by this loader or by a different loader) 645 // or ik is being loaded by a different thread (by this loader or by a different loader) 646 return NULL; 647 } 648 649 // No other thread has acquired this yet, so give it to *this thread* 650 ik->set_class_loader_data(loader_data); 651 } 652 653 // No longer holding SharedDictionary_lock 654 // No need to lock, as <ik> can be held only by a single thread. 655 loader_data->add_class(ik); 656 657 // Load and check super/interfaces, restore unsharable info 658 InstanceKlass* shared_klass = load_shared_class(ik, class_loader, protection_domain, THREAD); 659 if (shared_klass == NULL || HAS_PENDING_EXCEPTION) { 660 // TODO: clean up <ik> so it can be used again 661 return NULL; 662 } 663 664 return shared_klass; 665 } 666 667 bool SystemDictionaryShared::add_non_builtin_klass(Symbol* name, ClassLoaderData* loader_data, 668 InstanceKlass* k, 669 TRAPS) { 670 assert(DumpSharedSpaces, "only when dumping"); 671 assert(UseAppCDS && boot_loader_dictionary() != NULL, "must be"); 672 673 if (boot_loader_dictionary()->add_non_builtin_klass(name, loader_data, k)) { 674 MutexLocker mu_r(Compile_lock, THREAD); // not really necessary, but add_to_hierarchy asserts this. 675 add_to_hierarchy(k, CHECK_0); 676 return true; 677 } 678 return false; 679 } 680 681 // This function is called to resolve the super/interfaces of shared classes for 682 // non-built-in loaders. E.g., ChildClass in the below example 683 // where "super:" (and optionally "interface:") have been specified. 684 // 685 // java/lang/Object id: 0 686 // Interface id: 2 super: 0 source: cust.jar 687 // ChildClass id: 4 super: 0 interfaces: 2 source: cust.jar 688 Klass* SystemDictionaryShared::dump_time_resolve_super_or_fail( 689 Symbol* child_name, Symbol* class_name, Handle class_loader, 690 Handle protection_domain, bool is_superclass, TRAPS) { 691 692 assert(DumpSharedSpaces, "only when dumping"); 693 694 ClassListParser* parser = ClassListParser::instance(); 695 if (parser == NULL) { 696 // We're still loading the well-known classes, before the ClassListParser is created. 697 return NULL; 698 } 699 if (child_name->equals(parser->current_class_name())) { 700 // When this function is called, all the numbered super and interface types 701 // must have already been loaded. Hence this function is never recursively called. 702 if (is_superclass) { 703 return parser->lookup_super_for_current_class(class_name); 704 } else { 705 return parser->lookup_interface_for_current_class(class_name); 706 } 707 } else { 708 // The VM is not trying to resolve a super type of parser->current_class_name(). 709 // Instead, it's resolving an error class (because parser->current_class_name() has 710 // failed parsing or verification). Don't do anything here. 711 return NULL; 712 } 713 } 714 715 struct SharedMiscInfo { 716 Klass* _klass; 717 int _clsfile_size; 718 int _clsfile_crc32; 719 }; 720 721 static GrowableArray<SharedMiscInfo>* misc_info_array = NULL; 722 723 void SystemDictionaryShared::set_shared_class_misc_info(Klass* k, ClassFileStream* cfs) { 724 assert(DumpSharedSpaces, "only when dumping"); 725 int clsfile_size = cfs->length(); 726 int clsfile_crc32 = ClassLoader::crc32(0, (const char*)cfs->buffer(), cfs->length()); 727 728 if (misc_info_array == NULL) { 729 misc_info_array = new (ResourceObj::C_HEAP, mtClass) GrowableArray<SharedMiscInfo>(20, /*c heap*/ true); 730 } 731 732 SharedMiscInfo misc_info; 733 DEBUG_ONLY({ 734 for (int i=0; i<misc_info_array->length(); i++) { 735 misc_info = misc_info_array->at(i); 736 assert(misc_info._klass != k, "cannot call set_shared_class_misc_info twice for the same class"); 737 } 738 }); 739 740 misc_info._klass = k; 741 misc_info._clsfile_size = clsfile_size; 742 misc_info._clsfile_crc32 = clsfile_crc32; 743 744 misc_info_array->append(misc_info); 745 } 746 747 void SystemDictionaryShared::init_shared_dictionary_entry(Klass* k, DictionaryEntry* ent) { 748 SharedDictionaryEntry* entry = (SharedDictionaryEntry*)ent; 749 entry->_id = -1; 750 entry->_clsfile_size = -1; 751 entry->_clsfile_crc32 = -1; 752 entry->_verifier_constraints = NULL; 753 entry->_verifier_constraint_flags = NULL; 754 755 if (misc_info_array != NULL) { 756 for (int i=0; i<misc_info_array->length(); i++) { 757 SharedMiscInfo misc_info = misc_info_array->at(i); 758 if (misc_info._klass == k) { 759 entry->_clsfile_size = misc_info._clsfile_size; 760 entry->_clsfile_crc32 = misc_info._clsfile_crc32; 761 misc_info_array->remove_at(i); 762 return; 763 } 764 } 765 } 766 } 767 768 bool SystemDictionaryShared::add_verification_constraint(Klass* k, Symbol* name, 769 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object) { 770 assert(DumpSharedSpaces, "called at dump time only"); 771 772 // Skip anonymous classes, which are not archived as they are not in 773 // dictionary (see assert_no_anonymoys_classes_in_dictionaries() in 774 // VM_PopulateDumpSharedSpace::doit()). 775 if (k->class_loader_data()->is_anonymous()) { 776 return true; // anonymous classes are not archived, skip 777 } 778 779 SharedDictionaryEntry* entry = ((SharedDictionary*)(k->class_loader_data()->dictionary()))->find_entry_for(k); 780 ResourceMark rm; 781 // Lambda classes are not archived and will be regenerated at runtime. 782 if (entry == NULL && strstr(k->name()->as_C_string(), "Lambda$") != NULL) { 783 return true; 784 } 785 assert(entry != NULL, "class should be in dictionary before being verified"); 786 entry->add_verification_constraint(name, from_name, from_field_is_protected, 787 from_is_array, from_is_object); 788 if (entry->is_builtin()) { 789 // For builtin class loaders, we can try to complete the verification check at dump time, 790 // because we can resolve all the constraint classes. 791 return false; 792 } else { 793 // For non-builtin class loaders, we cannot complete the verification check at dump time, 794 // because at dump time we don't know how to resolve classes for such loaders. 795 return true; 796 } 797 } 798 799 void SystemDictionaryShared::finalize_verification_constraints() { 800 boot_loader_dictionary()->finalize_verification_constraints(); 801 } 802 803 void SystemDictionaryShared::check_verification_constraints(InstanceKlass* klass, 804 TRAPS) { 805 assert(!DumpSharedSpaces && UseSharedSpaces, "called at run time with CDS enabled only"); 806 SharedDictionaryEntry* entry = shared_dictionary()->find_entry_for(klass); 807 assert(entry != NULL, "call this only for shared classes"); 808 entry->check_verification_constraints(klass, THREAD); 809 } 810 811 SharedDictionaryEntry* SharedDictionary::find_entry_for(Klass* klass) { 812 Symbol* class_name = klass->name(); 813 unsigned int hash = compute_hash(class_name); 814 int index = hash_to_index(hash); 815 816 for (SharedDictionaryEntry* entry = bucket(index); 817 entry != NULL; 818 entry = entry->next()) { 819 if (entry->hash() == hash && entry->literal() == klass) { 820 return entry; 821 } 822 } 823 824 return NULL; 825 } 826 827 void SharedDictionary::finalize_verification_constraints() { 828 int bytes = 0, count = 0; 829 for (int index = 0; index < table_size(); index++) { 830 for (SharedDictionaryEntry *probe = bucket(index); 831 probe != NULL; 832 probe = probe->next()) { 833 int n = probe->finalize_verification_constraints(); 834 if (n > 0) { 835 bytes += n; 836 count ++; 837 } 838 } 839 } 840 if (log_is_enabled(Info, cds, verification)) { 841 double avg = 0; 842 if (count > 0) { 843 avg = double(bytes) / double(count); 844 } 845 log_info(cds, verification)("Recorded verification constraints for %d classes = %d bytes (avg = %.2f bytes) ", count, bytes, avg); 846 } 847 } 848 849 void SharedDictionaryEntry::add_verification_constraint(Symbol* name, 850 Symbol* from_name, bool from_field_is_protected, bool from_is_array, bool from_is_object) { 851 if (_verifier_constraints == NULL) { 852 _verifier_constraints = new(ResourceObj::C_HEAP, mtClass) GrowableArray<Symbol*>(8, true, mtClass); 853 } 854 if (_verifier_constraint_flags == NULL) { 855 _verifier_constraint_flags = new(ResourceObj::C_HEAP, mtClass) GrowableArray<char>(4, true, mtClass); 856 } 857 GrowableArray<Symbol*>* vc_array = (GrowableArray<Symbol*>*)_verifier_constraints; 858 for (int i=0; i<vc_array->length(); i+= 2) { 859 if (name == vc_array->at(i) && 860 from_name == vc_array->at(i+1)) { 861 return; 862 } 863 } 864 vc_array->append(name); 865 vc_array->append(from_name); 866 867 GrowableArray<char>* vcflags_array = (GrowableArray<char>*)_verifier_constraint_flags; 868 char c = 0; 869 c |= from_field_is_protected ? FROM_FIELD_IS_PROTECTED : 0; 870 c |= from_is_array ? FROM_IS_ARRAY : 0; 871 c |= from_is_object ? FROM_IS_OBJECT : 0; 872 vcflags_array->append(c); 873 874 if (log_is_enabled(Trace, cds, verification)) { 875 ResourceMark rm; 876 log_trace(cds, verification)("add_verification_constraint: %s: %s must be subclass of %s", 877 instance_klass()->external_name(), from_name->as_klass_external_name(), 878 name->as_klass_external_name()); 879 } 880 } 881 882 int SharedDictionaryEntry::finalize_verification_constraints() { 883 assert(DumpSharedSpaces, "called at dump time only"); 884 Thread* THREAD = Thread::current(); 885 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 886 GrowableArray<Symbol*>* vc_array = (GrowableArray<Symbol*>*)_verifier_constraints; 887 GrowableArray<char>* vcflags_array = (GrowableArray<char>*)_verifier_constraint_flags; 888 889 if (vc_array != NULL) { 890 if (log_is_enabled(Trace, cds, verification)) { 891 ResourceMark rm; 892 log_trace(cds, verification)("finalize_verification_constraint: %s", 893 literal()->external_name()); 894 } 895 896 // Copy the constraints from C_HEAP-alloced GrowableArrays to Metaspace-alloced 897 // Arrays 898 int size = 0; 899 { 900 // FIXME: change this to be done after relocation, so we can use symbol offset?? 901 int length = vc_array->length(); 902 Array<Symbol*>* out = MetadataFactory::new_array<Symbol*>(loader_data, length, 0, THREAD); 903 assert(out != NULL, "Dump time allocation failure would have aborted VM"); 904 for (int i=0; i<length; i++) { 905 out->at_put(i, vc_array->at(i)); 906 } 907 _verifier_constraints = out; 908 size += out->size() * BytesPerWord; 909 delete vc_array; 910 } 911 { 912 int length = vcflags_array->length(); 913 Array<char>* out = MetadataFactory::new_array<char>(loader_data, length, 0, THREAD); 914 assert(out != NULL, "Dump time allocation failure would have aborted VM"); 915 for (int i=0; i<length; i++) { 916 out->at_put(i, vcflags_array->at(i)); 917 } 918 _verifier_constraint_flags = out; 919 size += out->size() * BytesPerWord; 920 delete vcflags_array; 921 } 922 923 return size; 924 } 925 return 0; 926 } 927 928 void SharedDictionaryEntry::check_verification_constraints(InstanceKlass* klass, TRAPS) { 929 Array<Symbol*>* vc_array = (Array<Symbol*>*)_verifier_constraints; 930 Array<char>* vcflags_array = (Array<char>*)_verifier_constraint_flags; 931 932 if (vc_array != NULL) { 933 int length = vc_array->length(); 934 for (int i=0; i<length; i+=2) { 935 Symbol* name = vc_array->at(i); 936 Symbol* from_name = vc_array->at(i+1); 937 char c = vcflags_array->at(i/2); 938 939 bool from_field_is_protected = (c & FROM_FIELD_IS_PROTECTED) ? true : false; 940 bool from_is_array = (c & FROM_IS_ARRAY) ? true : false; 941 bool from_is_object = (c & FROM_IS_OBJECT) ? true : false; 942 943 bool ok = VerificationType::resolve_and_check_assignability(klass, name, 944 from_name, from_field_is_protected, from_is_array, from_is_object, CHECK); 945 if (!ok) { 946 ResourceMark rm(THREAD); 947 stringStream ss; 948 949 ss.print_cr("Bad type on operand stack"); 950 ss.print_cr("Exception Details:"); 951 ss.print_cr(" Location:\n %s", klass->name()->as_C_string()); 952 ss.print_cr(" Reason:\n Type '%s' is not assignable to '%s'", 953 from_name->as_quoted_ascii(), name->as_quoted_ascii()); 954 THROW_MSG(vmSymbols::java_lang_VerifyError(), ss.as_string()); 955 } 956 } 957 } 958 } 959 960 void SharedDictionaryEntry::metaspace_pointers_do(MetaspaceClosure* it) { 961 it->push((Array<Symbol*>**)&_verifier_constraints); 962 it->push((Array<char>**)&_verifier_constraint_flags); 963 } 964 965 bool SharedDictionary::add_non_builtin_klass(const Symbol* class_name, 966 ClassLoaderData* loader_data, 967 InstanceKlass* klass) { 968 969 assert(DumpSharedSpaces, "supported only when dumping"); 970 assert(klass != NULL, "adding NULL klass"); 971 assert(klass->name() == class_name, "sanity check on name"); 972 assert(klass->shared_classpath_index() < 0, 973 "the shared classpath index should not be set for shared class loaded by the custom loaders"); 974 975 // Add an entry for a non-builtin class. 976 // For a shared class for custom class loaders, SystemDictionary::resolve_or_null will 977 // not find this class, because is_builtin() is false. 978 unsigned int hash = compute_hash(class_name); 979 int index = hash_to_index(hash); 980 981 for (SharedDictionaryEntry* entry = bucket(index); 982 entry != NULL; 983 entry = entry->next()) { 984 if (entry->hash() == hash) { 985 Klass* klass = (Klass*)entry->literal(); 986 if (klass->name() == class_name && klass->class_loader_data() == loader_data) { 987 // There is already a class defined with the same name 988 return false; 989 } 990 } 991 } 992 993 assert(Dictionary::entry_size() >= sizeof(SharedDictionaryEntry), "must be big enough"); 994 SharedDictionaryEntry* entry = (SharedDictionaryEntry*)new_entry(hash, klass); 995 add_entry(index, entry); 996 997 assert(entry->is_unregistered(), "sanity"); 998 assert(!entry->is_builtin(), "sanity"); 999 return true; 1000 } 1001 1002 1003 //----------------- 1004 // SharedDictionary 1005 //----------------- 1006 1007 1008 Klass* SharedDictionary::find_class_for_builtin_loader(const Symbol* name) const { 1009 SharedDictionaryEntry* entry = get_entry_for_builtin_loader(name); 1010 return entry != NULL ? entry->instance_klass() : (Klass*)NULL; 1011 } 1012 1013 Klass* SharedDictionary::find_class_for_unregistered_loader(const Symbol* name, 1014 int clsfile_size, 1015 int clsfile_crc32) const { 1016 1017 const SharedDictionaryEntry* entry = get_entry_for_unregistered_loader(name, 1018 clsfile_size, 1019 clsfile_crc32); 1020 return entry != NULL ? entry->instance_klass() : (Klass*)NULL; 1021 } 1022 1023 void SharedDictionary::update_entry(Klass* klass, int id) { 1024 assert(DumpSharedSpaces, "supported only when dumping"); 1025 Symbol* class_name = klass->name(); 1026 unsigned int hash = compute_hash(class_name); 1027 int index = hash_to_index(hash); 1028 1029 for (SharedDictionaryEntry* entry = bucket(index); 1030 entry != NULL; 1031 entry = entry->next()) { 1032 if (entry->hash() == hash && entry->literal() == klass) { 1033 entry->_id = id; 1034 return; 1035 } 1036 } 1037 1038 ShouldNotReachHere(); 1039 } 1040 1041 SharedDictionaryEntry* SharedDictionary::get_entry_for_builtin_loader(const Symbol* class_name) const { 1042 assert(!DumpSharedSpaces, "supported only when at runtime"); 1043 unsigned int hash = compute_hash(class_name); 1044 const int index = hash_to_index(hash); 1045 1046 for (SharedDictionaryEntry* entry = bucket(index); 1047 entry != NULL; 1048 entry = entry->next()) { 1049 if (entry->hash() == hash && entry->equals(class_name)) { 1050 if (entry->is_builtin()) { 1051 return entry; 1052 } 1053 } 1054 } 1055 return NULL; 1056 } 1057 1058 SharedDictionaryEntry* SharedDictionary::get_entry_for_unregistered_loader(const Symbol* class_name, 1059 int clsfile_size, 1060 int clsfile_crc32) const { 1061 assert(!DumpSharedSpaces, "supported only when at runtime"); 1062 unsigned int hash = compute_hash(class_name); 1063 int index = hash_to_index(hash); 1064 1065 for (SharedDictionaryEntry* entry = bucket(index); 1066 entry != NULL; 1067 entry = entry->next()) { 1068 if (entry->hash() == hash && entry->equals(class_name)) { 1069 if (entry->is_unregistered()) { 1070 if (clsfile_size == -1) { 1071 // We're called from class_exists_for_unregistered_loader. At run time, we want to 1072 // compute the CRC of a ClassFileStream only if there is an UNREGISTERED class 1073 // with the matching name. 1074 return entry; 1075 } else { 1076 // We're called from find_class_for_unregistered_loader 1077 if (entry->_clsfile_size && clsfile_crc32 == entry->_clsfile_crc32) { 1078 return entry; 1079 } 1080 } 1081 1082 // There can be only 1 class with this name for unregistered loaders. 1083 return NULL; 1084 } 1085 } 1086 } 1087 return NULL; 1088 }