1 /* 2 * Copyright (c) 2016, 2025, 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 "cds/aotLogging.hpp" 26 #include "cds/archiveBuilder.hpp" 27 #include "cds/cdsConfig.hpp" 28 #include "cds/metaspaceShared.hpp" 29 #include "classfile/classFileParser.hpp" 30 #include "classfile/classLoader.hpp" 31 #include "classfile/classLoaderData.inline.hpp" 32 #include "classfile/classLoaderDataShared.hpp" 33 #include "classfile/classLoaderExt.hpp" 34 #include "classfile/javaAssertions.hpp" 35 #include "classfile/javaClasses.hpp" 36 #include "classfile/javaClasses.inline.hpp" 37 #include "classfile/moduleEntry.hpp" 38 #include "classfile/modules.hpp" 39 #include "classfile/packageEntry.hpp" 40 #include "classfile/stringTable.hpp" 41 #include "classfile/symbolTable.hpp" 42 #include "classfile/systemDictionary.hpp" 43 #include "classfile/vmClasses.hpp" 44 #include "classfile/vmSymbols.hpp" 45 #include "jvm.h" 46 #include "logging/log.hpp" 47 #include "logging/logStream.hpp" 48 #include "memory/resourceArea.hpp" 49 #include "prims/jvmtiExport.hpp" 50 #include "runtime/arguments.hpp" 51 #include "runtime/globals_extension.hpp" 52 #include "runtime/handles.inline.hpp" 53 #include "runtime/javaCalls.hpp" 54 #include "runtime/jniHandles.inline.hpp" 55 #include "utilities/formatBuffer.hpp" 56 #include "utilities/stringUtils.hpp" 57 #include "utilities/utf8.hpp" 58 59 static bool verify_module_name(const char *module_name, int len) { 60 assert(module_name != nullptr, "invariant"); 61 return (len > 0 && len <= Symbol::max_length()); 62 } 63 64 static bool verify_package_name(const char* package_name, int len) { 65 assert(package_name != nullptr, "Package name derived from non-null jstring can't be null"); 66 return (len > 0 && len <= Symbol::max_length() && 67 ClassFileParser::verify_unqualified_name(package_name, len, 68 ClassFileParser::LegalClass)); 69 } 70 71 static char* get_module_name(oop module, int& len, TRAPS) { 72 oop name_oop = java_lang_Module::name(module); 73 if (name_oop == nullptr) { 74 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(), "Null module name"); 75 } 76 size_t utf8_len; 77 char* module_name = java_lang_String::as_utf8_string(name_oop, utf8_len); 78 len = checked_cast<int>(utf8_len); // module names are < 64K 79 if (!verify_module_name(module_name, len)) { 80 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 81 err_msg("Invalid module name: %s", module_name)); 82 } 83 return module_name; 84 } 85 86 static Symbol* as_symbol(jstring str_object) { 87 if (str_object == nullptr) { 88 return nullptr; 89 } 90 size_t len; 91 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(str_object), len); 92 return SymbolTable::new_symbol(str, checked_cast<int>(len)); 93 } 94 95 ModuleEntryTable* Modules::get_module_entry_table(Handle h_loader) { 96 // This code can be called during start-up, before the classLoader's classLoader data got 97 // created. So, call register_loader() to make sure the classLoader data gets created. 98 ClassLoaderData *loader_cld = SystemDictionary::register_loader(h_loader); 99 return loader_cld->modules(); 100 } 101 102 static PackageEntryTable* get_package_entry_table(Handle h_loader) { 103 // This code can be called during start-up, before the classLoader's classLoader data got 104 // created. So, call register_loader() to make sure the classLoader data gets created. 105 ClassLoaderData *loader_cld = SystemDictionary::register_loader(h_loader); 106 return loader_cld->packages(); 107 } 108 109 static ModuleEntry* get_module_entry(Handle module, TRAPS) { 110 if (!java_lang_Module::is_instance(module())) { 111 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), 112 "module is not an instance of type java.lang.Module"); 113 } 114 return java_lang_Module::module_entry(module()); 115 } 116 117 118 static PackageEntry* get_locked_package_entry(ModuleEntry* module_entry, const char* package_name, int len) { 119 assert(Module_lock->owned_by_self(), "should have the Module_lock"); 120 assert(package_name != nullptr, "Precondition"); 121 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(package_name, len); 122 PackageEntryTable* package_entry_table = module_entry->loader_data()->packages(); 123 assert(package_entry_table != nullptr, "Unexpected null package entry table"); 124 PackageEntry* package_entry = package_entry_table->locked_lookup_only(pkg_symbol); 125 assert(package_entry == nullptr || package_entry->module() == module_entry, "Unexpectedly found a package linked to another module"); 126 return package_entry; 127 } 128 129 static PackageEntry* get_package_entry_by_name(Symbol* package, Handle h_loader) { 130 if (package != nullptr) { 131 PackageEntryTable* const package_entry_table = 132 get_package_entry_table(h_loader); 133 assert(package_entry_table != nullptr, "Unexpected null package entry table"); 134 return package_entry_table->lookup_only(package); 135 } 136 return nullptr; 137 } 138 139 bool Modules::is_package_defined(Symbol* package, Handle h_loader) { 140 PackageEntry* res = get_package_entry_by_name(package, h_loader); 141 return res != nullptr; 142 } 143 144 // Converts the String oop to an internal package 145 // Will use the provided buffer if it's sufficiently large, otherwise allocates 146 // a resource array 147 // The length of the resulting string will be assigned to utf8_len 148 static const char* as_internal_package(oop package_string, char* buf, size_t buflen, int& utf8_len) { 149 size_t full_utf8_len; 150 char* package_name = java_lang_String::as_utf8_string_full(package_string, buf, buflen, full_utf8_len); 151 utf8_len = checked_cast<int>(full_utf8_len); // package names are < 64K 152 153 // Turn all '/'s into '.'s 154 for (int index = 0; index < utf8_len; index++) { 155 if (package_name[index] == JVM_SIGNATURE_DOT) { 156 package_name[index] = JVM_SIGNATURE_SLASH; 157 } 158 } 159 return package_name; 160 } 161 162 static void define_javabase_module(Handle module_handle, jstring version, jstring location, 163 objArrayHandle pkgs, int num_packages, TRAPS) { 164 ResourceMark rm(THREAD); 165 166 // Obtain java.base's module version 167 TempNewSymbol version_symbol = as_symbol(version); 168 169 // Obtain java.base's location 170 TempNewSymbol location_symbol = as_symbol(location); 171 172 // Check that the packages are syntactically ok. 173 char buf[128]; 174 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages); 175 for (int x = 0; x < num_packages; x++) { 176 oop pkg_str = pkgs->obj_at(x); 177 178 if (pkg_str == nullptr || pkg_str->klass() != vmClasses::String_klass()) { 179 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 180 err_msg("Bad package name")); 181 } 182 183 int package_len; 184 const char* package_name = as_internal_package(pkg_str, buf, sizeof(buf), package_len); 185 if (!verify_package_name(package_name, package_len)) { 186 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 187 err_msg("Invalid package name: %s for module: " JAVA_BASE_NAME, package_name)); 188 } 189 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, package_len); 190 pkg_list->append(pkg_symbol); 191 } 192 193 // Validate java_base's loader is the boot loader. 194 oop loader = java_lang_Module::loader(module_handle()); 195 if (loader != nullptr) { 196 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 197 "Class loader must be the boot class loader"); 198 } 199 Handle h_loader(THREAD, loader); 200 201 // Ensure the boot loader's PackageEntryTable has been created 202 PackageEntryTable* package_table = get_package_entry_table(h_loader); 203 assert(pkg_list->length() == 0 || package_table != nullptr, "Bad package_table"); 204 205 // Ensure java.base's ModuleEntry has been created 206 assert(ModuleEntryTable::javabase_moduleEntry() != nullptr, "No ModuleEntry for " JAVA_BASE_NAME); 207 208 bool duplicate_javabase = false; 209 { 210 MutexLocker m1(THREAD, Module_lock); 211 212 if (ModuleEntryTable::javabase_defined()) { 213 duplicate_javabase = true; 214 } else { 215 216 // Verify that all java.base packages created during bootstrapping are in 217 // pkg_list. If any are not in pkg_list, than a non-java.base class was 218 // loaded erroneously pre java.base module definition. 219 package_table->verify_javabase_packages(pkg_list); 220 221 // loop through and add any new packages for java.base 222 for (int x = 0; x < pkg_list->length(); x++) { 223 // Some of java.base's packages were added early in bootstrapping, ignore duplicates. 224 package_table->locked_create_entry_if_absent(pkg_list->at(x), 225 ModuleEntryTable::javabase_moduleEntry()); 226 assert(package_table->locked_lookup_only(pkg_list->at(x)) != nullptr, 227 "Unable to create a " JAVA_BASE_NAME " package entry"); 228 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of 229 // the Symbol* that was created above for each package. The refcount was incremented 230 // by SymbolTable::new_symbol and as well by the PackageEntry creation. 231 pkg_list->at(x)->decrement_refcount(); 232 } 233 234 // Finish defining java.base's ModuleEntry 235 ModuleEntryTable::finalize_javabase(module_handle, version_symbol, location_symbol); 236 } 237 } 238 if (duplicate_javabase) { 239 THROW_MSG(vmSymbols::java_lang_InternalError(), 240 "Module " JAVA_BASE_NAME " is already defined"); 241 } 242 243 // Only the thread that actually defined the base module will get here, 244 // so no locking is needed. 245 246 // Patch any previously loaded class's module field with java.base's java.lang.Module. 247 ModuleEntryTable::patch_javabase_entries(THREAD, module_handle); 248 249 log_info(module, load)(JAVA_BASE_NAME " location: %s", 250 location_symbol != nullptr ? location_symbol->as_C_string() : "nullptr"); 251 log_debug(module)("define_javabase_module(): Definition of module: " 252 JAVA_BASE_NAME ", version: %s, location: %s, package #: %d", 253 version_symbol != nullptr ? version_symbol->as_C_string() : "nullptr", 254 location_symbol != nullptr ? location_symbol->as_C_string() : "nullptr", 255 pkg_list->length()); 256 257 // packages defined to java.base 258 if (log_is_enabled(Trace, module)) { 259 for (int x = 0; x < pkg_list->length(); x++) { 260 log_trace(module)("define_javabase_module(): creation of package %s for module " JAVA_BASE_NAME, 261 (pkg_list->at(x))->as_C_string()); 262 } 263 } 264 } 265 266 // Caller needs ResourceMark. 267 static void throw_dup_pkg_exception(const char* module_name, PackageEntry* package, TRAPS) { 268 const char* package_name = package->name()->as_C_string(); 269 if (package->module()->is_named()) { 270 THROW_MSG(vmSymbols::java_lang_IllegalStateException(), 271 err_msg("Package %s for module %s is already in another module, %s, defined to the class loader", 272 package_name, module_name, package->module()->name()->as_C_string())); 273 } else { 274 THROW_MSG(vmSymbols::java_lang_IllegalStateException(), 275 err_msg("Package %s for module %s is already in the unnamed module defined to the class loader", 276 package_name, module_name)); 277 } 278 } 279 280 void Modules::define_module(Handle module, jboolean is_open, jstring version, 281 jstring location, jobjectArray packages, TRAPS) { 282 check_cds_restrictions(CHECK); 283 ResourceMark rm(THREAD); 284 285 if (module.is_null()) { 286 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object"); 287 } 288 289 if (!java_lang_Module::is_instance(module())) { 290 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 291 "module is not an instance of type java.lang.Module"); 292 } 293 294 int module_name_len; 295 char* module_name = get_module_name(module(), module_name_len, CHECK); 296 if (module_name == nullptr) { 297 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 298 "Module name cannot be null"); 299 } 300 301 // Resolve packages 302 objArrayHandle packages_h(THREAD, objArrayOop(JNIHandles::resolve(packages))); 303 int num_packages = (packages_h.is_null() ? 0 : packages_h->length()); 304 305 // Special handling of java.base definition 306 if (strcmp(module_name, JAVA_BASE_NAME) == 0) { 307 assert(is_open == JNI_FALSE, "java.base module cannot be open"); 308 define_javabase_module(module, version, location, packages_h, num_packages, CHECK); 309 return; 310 } 311 312 oop loader = java_lang_Module::loader(module()); 313 Handle h_loader = Handle(THREAD, loader); 314 // define_module can be called during start-up, before the class loader's ClassLoaderData 315 // has been created. SystemDictionary::register_loader ensures creation, if needed. 316 ClassLoaderData* loader_data = SystemDictionary::register_loader(h_loader); 317 assert(loader_data != nullptr, "class loader data shouldn't be null"); 318 319 // Only modules defined to either the boot or platform class loader, can define a "java/" package. 320 bool java_pkg_disallowed = !h_loader.is_null() && 321 !SystemDictionary::is_platform_class_loader(h_loader()); 322 323 // Check that the list of packages has no duplicates and that the 324 // packages are syntactically ok. 325 char buf[128]; 326 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages); 327 for (int x = 0; x < num_packages; x++) { 328 oop pkg_str = packages_h->obj_at(x); 329 if (pkg_str == nullptr || pkg_str->klass() != vmClasses::String_klass()) { 330 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 331 err_msg("Bad package name")); 332 } 333 334 int package_len; 335 const char* package_name = as_internal_package(pkg_str, buf, sizeof(buf), package_len); 336 if (!verify_package_name(package_name, package_len)) { 337 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 338 err_msg("Invalid package name: %s for module: %s", 339 package_name, module_name)); 340 } 341 342 // Only modules defined to either the boot or platform class loader, can define a "java/" package. 343 if (java_pkg_disallowed && 344 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 && 345 (package_name[JAVAPKG_LEN] == JVM_SIGNATURE_SLASH || package_name[JAVAPKG_LEN] == '\0'))) { 346 const char* class_loader_name = loader_data->loader_name_and_id(); 347 size_t pkg_len = strlen(package_name); 348 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len + 1); 349 strncpy(pkg_name, package_name, pkg_len + 1); 350 StringUtils::replace_no_expand(pkg_name, "/", "."); 351 const char* msg_text1 = "Class loader (instance of): "; 352 const char* msg_text2 = " tried to define prohibited package name: "; 353 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1; 354 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len); 355 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name); 356 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message); 357 } 358 359 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, package_len); 360 pkg_list->append(pkg_symbol); 361 } 362 363 ModuleEntryTable* module_table = get_module_entry_table(h_loader); 364 assert(module_table != nullptr, "module entry table shouldn't be null"); 365 366 // Create symbol* entry for module name. 367 TempNewSymbol module_symbol = SymbolTable::new_symbol(module_name, module_name_len); 368 369 bool dupl_modules = false; 370 371 // Create symbol for module version. 372 TempNewSymbol version_symbol = as_symbol(version); 373 374 // Create symbol* entry for module location. 375 TempNewSymbol location_symbol = as_symbol(location); 376 377 PackageEntryTable* package_table = nullptr; 378 PackageEntry* existing_pkg = nullptr; 379 { 380 MutexLocker ml(THREAD, Module_lock); 381 382 if (num_packages > 0) { 383 package_table = get_package_entry_table(h_loader); 384 assert(package_table != nullptr, "Missing package_table"); 385 386 // Check that none of the packages exist in the class loader's package table. 387 for (int x = 0; x < pkg_list->length(); x++) { 388 existing_pkg = package_table->locked_lookup_only(pkg_list->at(x)); 389 if (existing_pkg != nullptr) { 390 // This could be because the module was already defined. If so, 391 // report that error instead of the package error. 392 if (module_table->lookup_only(module_symbol) != nullptr) { 393 dupl_modules = true; 394 } 395 break; 396 } 397 } 398 } // if (num_packages > 0)... 399 400 // Add the module and its packages. 401 if (!dupl_modules && existing_pkg == nullptr) { 402 if (module_table->lookup_only(module_symbol) == nullptr) { 403 // Create the entry for this module in the class loader's module entry table. 404 ModuleEntry* module_entry = module_table->locked_create_entry(module, 405 (is_open == JNI_TRUE), module_symbol, 406 version_symbol, location_symbol, loader_data); 407 assert(module_entry != nullptr, "module_entry creation failed"); 408 409 // Add the packages. 410 assert(pkg_list->length() == 0 || package_table != nullptr, "Bad package table"); 411 for (int y = 0; y < pkg_list->length(); y++) { 412 package_table->locked_create_entry(pkg_list->at(y), module_entry); 413 414 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of 415 // the Symbol* that was created above for each package. The refcount was incremented 416 // by SymbolTable::new_symbol and as well by the PackageEntry creation. 417 pkg_list->at(y)->decrement_refcount(); 418 } 419 420 // Store pointer to ModuleEntry record in java.lang.Module object. 421 java_lang_Module::set_module_entry(module(), module_entry); 422 } else { 423 dupl_modules = true; 424 } 425 } 426 } // Release the lock 427 428 // any errors ? 429 if (dupl_modules) { 430 THROW_MSG(vmSymbols::java_lang_IllegalStateException(), 431 err_msg("Module %s is already defined", module_name)); 432 } else if (existing_pkg != nullptr) { 433 throw_dup_pkg_exception(module_name, existing_pkg, CHECK); 434 } 435 436 log_info(module, load)("%s location: %s", module_name, 437 location_symbol != nullptr ? location_symbol->as_C_string() : "null"); 438 LogTarget(Debug, module) lt; 439 if (lt.is_enabled()) { 440 LogStream ls(lt); 441 ls.print("define_module(): creation of module: %s, version: %s, location: %s, ", 442 module_name, version_symbol != nullptr ? version_symbol->as_C_string() : "null", 443 location_symbol != nullptr ? location_symbol->as_C_string() : "null"); 444 loader_data->print_value_on(&ls); 445 ls.print_cr(", package #: %d", pkg_list->length()); 446 for (int y = 0; y < pkg_list->length(); y++) { 447 log_trace(module)("define_module(): creation of package %s for module %s", 448 (pkg_list->at(y))->as_C_string(), module_name); 449 } 450 } 451 452 // If the module is defined to the boot loader and an exploded build is being 453 // used, prepend <java.home>/modules/modules_name to the boot class path. 454 if (h_loader.is_null() && !ClassLoader::has_jrt_entry()) { 455 ClassLoader::add_to_exploded_build_list(THREAD, module_symbol); 456 } 457 458 #if COMPILER2_OR_JVMCI 459 // Special handling of jdk.incubator.vector 460 if (strcmp(module_name, "jdk.incubator.vector") == 0) { 461 if (FLAG_IS_DEFAULT(EnableVectorSupport)) { 462 FLAG_SET_DEFAULT(EnableVectorSupport, true); 463 } 464 if (EnableVectorSupport && FLAG_IS_DEFAULT(EnableVectorReboxing)) { 465 FLAG_SET_DEFAULT(EnableVectorReboxing, true); 466 } 467 if (EnableVectorSupport && EnableVectorReboxing && FLAG_IS_DEFAULT(EnableVectorAggressiveReboxing)) { 468 FLAG_SET_DEFAULT(EnableVectorAggressiveReboxing, true); 469 } 470 log_info(compilation)("EnableVectorSupport=%s", (EnableVectorSupport ? "true" : "false")); 471 log_info(compilation)("EnableVectorReboxing=%s", (EnableVectorReboxing ? "true" : "false")); 472 log_info(compilation)("EnableVectorAggressiveReboxing=%s", (EnableVectorAggressiveReboxing ? "true" : "false")); 473 } 474 #endif // COMPILER2_OR_JVMCI 475 } 476 477 #if INCLUDE_CDS_JAVA_HEAP 478 static bool _seen_platform_unnamed_module = false; 479 static bool _seen_system_unnamed_module = false; 480 481 // Validate the states of an java.lang.Module oop to be archived. 482 void Modules::check_archived_module_oop(oop orig_module_obj) { 483 assert(CDSConfig::is_dumping_full_module_graph(), "must be"); 484 assert(java_lang_Module::is_instance(orig_module_obj), "must be"); 485 486 ModuleEntry* orig_module_ent = java_lang_Module::module_entry_raw(orig_module_obj); 487 if (orig_module_ent == nullptr) { 488 // These special java.lang.Module oops are created in Java code. They are not 489 // defined via Modules::define_module(), so they don't have a ModuleEntry: 490 // java.lang.Module::ALL_UNNAMED_MODULE 491 // java.lang.Module::EVERYONE_MODULE 492 // jdk.internal.loader.ClassLoaders$BootClassLoader::unnamedModule 493 log_info(aot, module)("Archived java.lang.Module oop " PTR_FORMAT " with no ModuleEntry*", p2i(orig_module_obj)); 494 assert(java_lang_Module::name(orig_module_obj) == nullptr, "must be unnamed"); 495 } else { 496 // This java.lang.Module oop has an ModuleEntry*. Check if the latter is archived. 497 if (log_is_enabled(Info, aot, module)) { 498 ResourceMark rm; 499 LogStream ls(Log(aot, module)::info()); 500 ls.print("Archived java.lang.Module oop " PTR_FORMAT " for ", p2i(orig_module_obj)); 501 orig_module_ent->print(&ls); 502 } 503 504 // We only archive the default module graph, which should contain only java.lang.Module oops 505 // for the 3 built-in loaders (boot/platform/system) 506 ClassLoaderData* loader_data = orig_module_ent->loader_data(); 507 assert(loader_data->is_builtin_class_loader_data(), "must be"); 508 509 if (orig_module_ent->name() != nullptr) { 510 // For each named module, we archive both the java.lang.Module oop and the ModuleEntry. 511 assert(orig_module_ent->has_been_archived(), "sanity"); 512 } else { 513 // We only archive two unnamed module oops (for platform and system loaders). These do NOT have an archived 514 // ModuleEntry. 515 // 516 // At runtime, these oops are fetched from java_lang_ClassLoader::unnamedModule(loader) and 517 // are initialized in ClassLoaderData::ClassLoaderData() => ModuleEntry::create_unnamed_module(), where 518 // a new ModuleEntry is allocated. 519 assert(!loader_data->is_boot_class_loader_data(), "unnamed module for boot loader should be not archived"); 520 assert(!orig_module_ent->has_been_archived(), "sanity"); 521 522 if (SystemDictionary::is_platform_class_loader(loader_data->class_loader())) { 523 assert(!_seen_platform_unnamed_module, "only once"); 524 _seen_platform_unnamed_module = true; 525 } else if (SystemDictionary::is_system_class_loader(loader_data->class_loader())) { 526 assert(!_seen_system_unnamed_module, "only once"); 527 _seen_system_unnamed_module = true; 528 } else { 529 // The java.lang.Module oop and ModuleEntry of the unnamed module of the boot loader are 530 // not in the archived module graph. These are always allocated at runtime. 531 ShouldNotReachHere(); 532 } 533 } 534 } 535 } 536 537 void Modules::verify_archived_modules() { 538 ModuleEntry::verify_archived_module_entries(); 539 } 540 541 class Modules::ArchivedProperty { 542 const char* _prop; 543 const bool _numbered; 544 const char* _archived_value; 545 546 const char* get_flattened_value() const { 547 if (_numbered) { 548 return get_numbered_property_as_sorted_string(); 549 } else { 550 return Arguments::get_property(_prop); 551 } 552 } 553 554 void runtime_check() const; 555 const char* get_numbered_property_as_sorted_string() const; 556 557 public: 558 ArchivedProperty(const char* prop, bool numbered) 559 : _prop(prop), _numbered(numbered), _archived_value(nullptr) {} 560 561 void dump() { 562 ResourceMark rm; 563 const char* str = get_flattened_value(); 564 if (str != nullptr) { 565 _archived_value = ArchiveBuilder::current()->ro_strdup(str); 566 } 567 } 568 569 void serialize(SerializeClosure* soc) { 570 soc->do_ptr(&_archived_value); 571 if (soc->reading()) { 572 runtime_check(); 573 // Don't hold onto the pointer, in case we might decide to unmap the archive. 574 _archived_value = nullptr; 575 } 576 } 577 }; 578 579 Modules::ArchivedProperty Modules::_archived_props[] = { 580 // non-numbered 581 {"jdk.module.main", false}, 582 583 // numbered 584 {"jdk.module.addexports", true}, // --add-exports 585 {"jdk.module.addmods", true}, // --add-modules 586 {"jdk.module.enable.native.access", true}, // --enable-native-access 587 {"jdk.module.addopens", true}, // --add-opens 588 {"jdk.module.addreads", true}, // --add-reads 589 }; 590 591 constexpr size_t Modules::num_archived_props() { 592 return sizeof(_archived_props) / sizeof(_archived_props[0]); 593 } 594 595 Modules::ArchivedProperty& Modules::archived_prop(size_t i) { 596 assert(i < num_archived_props(), "oob"); 597 return _archived_props[i]; 598 } 599 600 void Modules::ArchivedProperty::runtime_check() const { 601 ResourceMark rm; 602 const char* runtime_value = get_flattened_value(); 603 aot_log_info(aot)("archived module property %s: %s", _prop, 604 _archived_value != nullptr ? _archived_value : "(null)"); 605 606 bool disable = false; 607 if (runtime_value == nullptr) { 608 if (_archived_value != nullptr) { 609 MetaspaceShared::report_loading_error("Mismatched values for property %s: %s specified during dump time but not during runtime", _prop, _archived_value); 610 disable = true; 611 } 612 } else { 613 if (_archived_value == nullptr) { 614 MetaspaceShared::report_loading_error("Mismatched values for property %s: %s specified during runtime but not during dump time", _prop, runtime_value); 615 disable = true; 616 } else if (strcmp(runtime_value, _archived_value) != 0) { 617 MetaspaceShared::report_loading_error("Mismatched values for property %s: runtime %s dump time %s", _prop, runtime_value, _archived_value); 618 disable = true; 619 } 620 } 621 622 if (disable) { 623 MetaspaceShared::report_loading_error("Disabling optimized module handling"); 624 CDSConfig::stop_using_optimized_module_handling(); 625 } 626 } 627 628 // Caller needs ResourceMark 629 const char* Modules::ArchivedProperty::get_numbered_property_as_sorted_string() const { 630 assert(_numbered, "sanity"); 631 // theoretical string size limit for decimal int, but the following loop will end much sooner due to 632 // OS command-line size limit. 633 const int max_digits = 10; 634 const int extra_symbols_count = 2; // includes '.', '\0' 635 size_t prop_len = strlen(_prop) + max_digits + extra_symbols_count; 636 char* prop_name = resource_allocate_bytes(prop_len); 637 GrowableArray<const char*> list; 638 for (unsigned int i = 0;; i++) { 639 jio_snprintf(prop_name, prop_len, "%s.%d", _prop, i); 640 const char* prop_value = Arguments::get_property(prop_name); 641 if (prop_value == nullptr) { 642 break; 643 } 644 char* p = ResourceArea::strdup(prop_value); 645 while (*p == ',') p++; // skip leading commas 646 while (*p) { 647 char* next = strchr(p, ','); 648 if (next == nullptr) { 649 // no more commas, p is the last element 650 list.append(p); 651 break; 652 } else { 653 *next = 0; 654 list.append(p); 655 p = next + 1; 656 } 657 } 658 } 659 660 // Example: 661 // --add-modules=java.compiler --add-modules=java.base,java.base,, 662 // 663 // list[0] = "java.compiler" 664 // list[1] = "java.base" 665 // list[2] = "java.base" 666 // list[3] = "" 667 // list[4] = "" 668 list.sort(ClassLoaderExt::compare_module_names); 669 670 const char* prefix = ""; 671 stringStream st; 672 const char* last_string = ""; // This also filters out all empty strings 673 for (int i = 0; i < list.length(); i++) { 674 const char* m = list.at(i); 675 if (strcmp(m, last_string) != 0) { // filter out duplicates 676 st.print("%s%s", prefix, m); 677 last_string = m; 678 prefix = ","; 679 } 680 } 681 682 return (st.size() > 0) ? st.as_string() : nullptr; // Example: "java.base,java.compiler" 683 } 684 685 void Modules::dump_archived_module_info() { 686 for (size_t i = 0; i < num_archived_props(); i++) { 687 archived_prop(i).dump(); 688 } 689 } 690 691 void Modules::serialize_archived_module_info(SerializeClosure* soc) { 692 for (size_t i = 0; i < num_archived_props(); i++) { 693 archived_prop(i).serialize(soc); 694 } 695 if (soc->reading()) { 696 aot_log_info(aot)("optimized module handling: %s", CDSConfig::is_using_optimized_module_handling() ? "enabled" : "disabled"); 697 aot_log_info(aot)("full module graph: %s", CDSConfig::is_using_full_module_graph() ? "enabled" : "disabled"); 698 } 699 } 700 701 void Modules::define_archived_modules(Handle h_platform_loader, Handle h_system_loader, TRAPS) { 702 assert(CDSConfig::is_using_full_module_graph(), "must be"); 703 704 // We don't want the classes used by the archived full module graph to be redefined by JVMTI. 705 // Luckily, such classes are loaded in the JVMTI "early" phase, and CDS is disabled if a JVMTI 706 // agent wants to redefine classes in this phase. 707 JVMTI_ONLY(assert(JvmtiExport::is_early_phase(), "must be")); 708 assert(!(JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()), 709 "CDS should be disabled if early class hooks are enabled"); 710 711 Handle java_base_module(THREAD, ClassLoaderDataShared::restore_archived_oops_for_null_class_loader_data()); 712 // Patch any previously loaded class's module field with java.base's java.lang.Module. 713 ModuleEntryTable::patch_javabase_entries(THREAD, java_base_module); 714 715 if (h_platform_loader.is_null()) { 716 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null platform loader object"); 717 } 718 719 if (h_system_loader.is_null()) { 720 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null system loader object"); 721 } 722 723 ClassLoaderData* platform_loader_data = SystemDictionary::register_loader(h_platform_loader); 724 SystemDictionary::set_platform_loader(platform_loader_data); 725 ClassLoaderDataShared::restore_java_platform_loader_from_archive(platform_loader_data); 726 727 ClassLoaderData* system_loader_data = SystemDictionary::register_loader(h_system_loader); 728 SystemDictionary::set_system_loader(system_loader_data); 729 // system_loader_data here is always an instance of jdk.internal.loader.ClassLoader$AppClassLoader. 730 // However, if -Djava.system.class.loader=xxx is specified, java_platform_loader() would 731 // be an instance of a user-defined class, so make sure this never happens. 732 assert(Arguments::get_property("java.system.class.loader") == nullptr, 733 "archived full module should have been disabled if -Djava.system.class.loader is specified"); 734 ClassLoaderDataShared::restore_java_system_loader_from_archive(system_loader_data); 735 } 736 737 void Modules::check_cds_restrictions(TRAPS) { 738 if (CDSConfig::is_dumping_full_module_graph() && Universe::is_module_initialized()) { 739 THROW_MSG(vmSymbols::java_lang_UnsupportedOperationException(), 740 "During -Xshare:dump, module system cannot be modified after it's initialized"); 741 } 742 } 743 #endif // INCLUDE_CDS_JAVA_HEAP 744 745 void Modules::set_bootloader_unnamed_module(Handle module, TRAPS) { 746 ResourceMark rm(THREAD); 747 748 if (module.is_null()) { 749 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object"); 750 } 751 if (!java_lang_Module::is_instance(module())) { 752 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 753 "module is not an instance of type java.lang.Module"); 754 } 755 756 // Ensure that this is an unnamed module 757 oop name = java_lang_Module::name(module()); 758 if (name != nullptr) { 759 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 760 "boot loader's unnamed module's java.lang.Module has a name"); 761 } 762 763 // Validate java_base's loader is the boot loader. 764 oop loader = java_lang_Module::loader(module()); 765 if (loader != nullptr) { 766 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 767 "Class loader must be the boot class loader"); 768 } 769 770 log_debug(module)("set_bootloader_unnamed_module(): recording unnamed module for boot loader"); 771 772 // Set java.lang.Module for the boot loader's unnamed module 773 ClassLoaderData* boot_loader_data = ClassLoaderData::the_null_class_loader_data(); 774 ModuleEntry* unnamed_module = boot_loader_data->unnamed_module(); 775 assert(unnamed_module != nullptr, "boot loader's unnamed ModuleEntry not defined"); 776 unnamed_module->set_module(boot_loader_data->add_handle(module)); 777 // Store pointer to the ModuleEntry in the unnamed module's java.lang.Module object. 778 java_lang_Module::set_module_entry(module(), unnamed_module); 779 } 780 781 void Modules::add_module_exports(Handle from_module, jstring package_name, Handle to_module, TRAPS) { 782 check_cds_restrictions(CHECK); 783 784 if (package_name == nullptr) { 785 THROW_MSG(vmSymbols::java_lang_NullPointerException(), 786 "package is null"); 787 } 788 if (from_module.is_null()) { 789 THROW_MSG(vmSymbols::java_lang_NullPointerException(), 790 "from_module is null"); 791 } 792 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK); 793 if (from_module_entry == nullptr) { 794 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 795 "from_module cannot be found"); 796 } 797 798 // All packages in unnamed and open modules are exported by default. 799 if (!from_module_entry->is_named() || from_module_entry->is_open()) return; 800 801 ModuleEntry* to_module_entry; 802 if (to_module.is_null()) { 803 to_module_entry = nullptr; // It's an unqualified export. 804 } else { 805 to_module_entry = get_module_entry(to_module, CHECK); 806 if (to_module_entry == nullptr) { 807 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 808 "to_module is invalid"); 809 } 810 } 811 812 PackageEntry* package_entry = nullptr; 813 char buf[128]; 814 int package_len; 815 816 ResourceMark rm(THREAD); 817 const char* pkg = as_internal_package(JNIHandles::resolve_non_null(package_name), buf, sizeof(buf), package_len); 818 { 819 MutexLocker ml(THREAD, Module_lock); 820 package_entry = get_locked_package_entry(from_module_entry, pkg, package_len); 821 // Do nothing if modules are the same 822 // If the package is not found we'll throw an exception later 823 if (from_module_entry != to_module_entry && 824 package_entry != nullptr) { 825 package_entry->set_exported(to_module_entry); 826 } 827 } 828 829 // Handle errors and logging outside locked section 830 if (package_entry == nullptr) { 831 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 832 err_msg("Package %s not found in from_module %s", 833 pkg != nullptr ? pkg : "", 834 from_module_entry->name()->as_C_string())); 835 } 836 837 if (log_is_enabled(Debug, module)) { 838 log_debug(module)("add_module_exports(): package %s in module %s is exported to module %s", 839 package_entry->name()->as_C_string(), 840 from_module_entry->name()->as_C_string(), 841 to_module_entry == nullptr ? "null" : 842 to_module_entry->is_named() ? 843 to_module_entry->name()->as_C_string() : UNNAMED_MODULE); 844 } 845 } 846 847 848 void Modules::add_module_exports_qualified(Handle from_module, jstring package, 849 Handle to_module, TRAPS) { 850 check_cds_restrictions(CHECK); 851 if (to_module.is_null()) { 852 THROW_MSG(vmSymbols::java_lang_NullPointerException(), 853 "to_module is null"); 854 } 855 add_module_exports(from_module, package, to_module, CHECK); 856 } 857 858 void Modules::add_reads_module(Handle from_module, Handle to_module, TRAPS) { 859 check_cds_restrictions(CHECK); 860 if (from_module.is_null()) { 861 THROW_MSG(vmSymbols::java_lang_NullPointerException(), 862 "from_module is null"); 863 } 864 865 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK); 866 if (from_module_entry == nullptr) { 867 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 868 "from_module is not valid"); 869 } 870 871 ModuleEntry* to_module_entry; 872 if (!to_module.is_null()) { 873 to_module_entry = get_module_entry(to_module, CHECK); 874 if (to_module_entry == nullptr) { 875 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 876 "to_module is invalid"); 877 } 878 } else { 879 to_module_entry = nullptr; 880 } 881 882 ResourceMark rm(THREAD); 883 log_debug(module)("add_reads_module(): Adding read from module %s to module %s", 884 from_module_entry->is_named() ? 885 from_module_entry->name()->as_C_string() : UNNAMED_MODULE, 886 to_module_entry == nullptr ? "all unnamed" : 887 (to_module_entry->is_named() ? 888 to_module_entry->name()->as_C_string() : UNNAMED_MODULE)); 889 890 // if modules are the same or if from_module is unnamed then no need to add the read. 891 if (from_module_entry != to_module_entry && from_module_entry->is_named()) { 892 from_module_entry->add_read(to_module_entry); 893 } 894 } 895 896 // This method is called by JFR and JNI. 897 jobject Modules::get_module(jclass clazz, TRAPS) { 898 assert(ModuleEntryTable::javabase_defined(), 899 "Attempt to call get_module before " JAVA_BASE_NAME " is defined"); 900 901 if (clazz == nullptr) { 902 THROW_MSG_(vmSymbols::java_lang_NullPointerException(), 903 "class is null", nullptr); 904 } 905 oop mirror = JNIHandles::resolve_non_null(clazz); 906 if (mirror == nullptr) { 907 log_debug(module)("get_module(): no mirror, returning nullptr"); 908 return nullptr; 909 } 910 if (!java_lang_Class::is_instance(mirror)) { 911 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(), 912 "Invalid class", nullptr); 913 } 914 915 oop module = java_lang_Class::module(mirror); 916 917 assert(module != nullptr, "java.lang.Class module field not set"); 918 assert(java_lang_Module::is_instance(module), "module is not an instance of type java.lang.Module"); 919 920 LogTarget(Debug,module) lt; 921 if (lt.is_enabled()) { 922 LogStream ls(lt); 923 Klass* klass = java_lang_Class::as_Klass(mirror); 924 oop module_name = java_lang_Module::name(module); 925 if (module_name != nullptr) { 926 ls.print("get_module(): module "); 927 java_lang_String::print(module_name, tty); 928 } else { 929 ls.print("get_module(): Unnamed Module"); 930 } 931 if (klass != nullptr) { 932 ResourceMark rm(THREAD); 933 ls.print_cr(" for class %s", klass->external_name()); 934 } else { 935 ls.print_cr(" for primitive class"); 936 } 937 } 938 939 return JNIHandles::make_local(THREAD, module); 940 } 941 942 oop Modules::get_named_module(Handle h_loader, const char* package_name) { 943 assert(ModuleEntryTable::javabase_defined(), 944 "Attempt to call get_named_module before " JAVA_BASE_NAME " is defined"); 945 assert(h_loader.is_null() || java_lang_ClassLoader::is_subclass(h_loader->klass()), 946 "Class loader is not a subclass of java.lang.ClassLoader"); 947 assert(package_name != nullptr, "the package_name should not be null"); 948 949 if (strlen(package_name) == 0) { 950 return nullptr; 951 } 952 TempNewSymbol package_sym = SymbolTable::new_symbol(package_name); 953 const PackageEntry* const pkg_entry = 954 get_package_entry_by_name(package_sym, h_loader); 955 const ModuleEntry* const module_entry = (pkg_entry != nullptr ? pkg_entry->module() : nullptr); 956 957 if (module_entry != nullptr && module_entry->module() != nullptr && module_entry->is_named()) { 958 return module_entry->module(); 959 } 960 return nullptr; 961 } 962 963 // Export package in module to all unnamed modules. 964 void Modules::add_module_exports_to_all_unnamed(Handle module, jstring package_name, TRAPS) { 965 check_cds_restrictions(CHECK); 966 if (module.is_null()) { 967 THROW_MSG(vmSymbols::java_lang_NullPointerException(), 968 "module is null"); 969 } 970 if (package_name == nullptr) { 971 THROW_MSG(vmSymbols::java_lang_NullPointerException(), 972 "package is null"); 973 } 974 ModuleEntry* module_entry = get_module_entry(module, CHECK); 975 if (module_entry == nullptr) { 976 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 977 "module is invalid"); 978 } 979 980 // No-op for unnamed module and open modules 981 if (!module_entry->is_named() || module_entry->is_open()) 982 return; 983 984 ResourceMark rm(THREAD); 985 char buf[128]; 986 int pkg_len; 987 const char* pkg = as_internal_package(JNIHandles::resolve_non_null(package_name), buf, sizeof(buf), pkg_len); 988 PackageEntry* package_entry = nullptr; 989 { 990 MutexLocker m1(THREAD, Module_lock); 991 package_entry = get_locked_package_entry(module_entry, pkg, pkg_len); 992 993 // Mark package as exported to all unnamed modules. 994 if (package_entry != nullptr) { 995 package_entry->set_is_exported_allUnnamed(); 996 } 997 } 998 999 // Handle errors and logging outside locked section 1000 if (package_entry == nullptr) { 1001 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), 1002 err_msg("Package %s not found in module %s", 1003 pkg != nullptr ? pkg : "", 1004 module_entry->name()->as_C_string())); 1005 } 1006 1007 if (log_is_enabled(Debug, module)) { 1008 log_debug(module)("add_module_exports_to_all_unnamed(): package %s in module" 1009 " %s is exported to all unnamed modules", 1010 package_entry->name()->as_C_string(), 1011 module_entry->name()->as_C_string()); 1012 } 1013 }