1 /* 2 * Copyright (c) 1997, 2024, 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 "cds/cds_globals.hpp" 27 #include "cds/cdsConfig.hpp" 28 #include "cds/filemap.hpp" 29 #include "classfile/classFileStream.hpp" 30 #include "classfile/classLoader.inline.hpp" 31 #include "classfile/classLoaderData.inline.hpp" 32 #include "classfile/classLoaderExt.hpp" 33 #include "classfile/classLoadInfo.hpp" 34 #include "classfile/javaClasses.hpp" 35 #include "classfile/moduleEntry.hpp" 36 #include "classfile/modules.hpp" 37 #include "classfile/packageEntry.hpp" 38 #include "classfile/klassFactory.hpp" 39 #include "classfile/symbolTable.hpp" 40 #include "classfile/systemDictionary.hpp" 41 #include "classfile/systemDictionaryShared.hpp" 42 #include "classfile/vmClasses.hpp" 43 #include "classfile/vmSymbols.hpp" 44 #include "compiler/compileBroker.hpp" 45 #include "interpreter/bytecodeStream.hpp" 46 #include "interpreter/oopMapCache.hpp" 47 #include "jimage.hpp" 48 #include "jvm.h" 49 #include "logging/log.hpp" 50 #include "logging/logStream.hpp" 51 #include "logging/logTag.hpp" 52 #include "memory/allocation.inline.hpp" 53 #include "memory/oopFactory.hpp" 54 #include "memory/resourceArea.hpp" 55 #include "memory/universe.hpp" 56 #include "oops/instanceKlass.hpp" 57 #include "oops/instanceRefKlass.hpp" 58 #include "oops/klass.inline.hpp" 59 #include "oops/method.inline.hpp" 60 #include "oops/objArrayOop.inline.hpp" 61 #include "oops/oop.inline.hpp" 62 #include "oops/symbol.hpp" 63 #include "prims/jvm_misc.hpp" 64 #include "runtime/arguments.hpp" 65 #include "runtime/handles.inline.hpp" 66 #include "runtime/init.hpp" 67 #include "runtime/interfaceSupport.inline.hpp" 68 #include "runtime/java.hpp" 69 #include "runtime/javaCalls.hpp" 70 #include "runtime/os.hpp" 71 #include "runtime/perfData.hpp" 72 #include "runtime/threadCritical.hpp" 73 #include "runtime/timer.hpp" 74 #include "runtime/vm_version.hpp" 75 #include "services/management.hpp" 76 #include "services/threadService.hpp" 77 #include "utilities/checkedCast.hpp" 78 #include "utilities/classpathStream.hpp" 79 #include "utilities/events.hpp" 80 #include "utilities/macros.hpp" 81 #include "utilities/utf8.hpp" 82 83 // Entry point in java.dll for path canonicalization 84 85 typedef int (*canonicalize_fn_t)(const char *orig, char *out, int len); 86 87 static canonicalize_fn_t CanonicalizeEntry = nullptr; 88 89 // Entry points for jimage.dll for loading jimage file entries 90 91 static JImageOpen_t JImageOpen = nullptr; 92 static JImageClose_t JImageClose = nullptr; 93 static JImageFindResource_t JImageFindResource = nullptr; 94 static JImageGetResource_t JImageGetResource = nullptr; 95 96 // JimageFile pointer, or null if exploded JDK build. 97 static JImageFile* JImage_file = nullptr; 98 99 // Globals 100 101 PerfCounter* ClassLoader::_perf_accumulated_time = nullptr; 102 PerfCounter* ClassLoader::_perf_classes_inited = nullptr; 103 PerfCounter* ClassLoader::_perf_class_init_time = nullptr; 104 PerfCounter* ClassLoader::_perf_class_init_selftime = nullptr; 105 PerfCounter* ClassLoader::_perf_classes_verified = nullptr; 106 PerfCounter* ClassLoader::_perf_class_verify_time = nullptr; 107 PerfCounter* ClassLoader::_perf_class_verify_selftime = nullptr; 108 PerfCounter* ClassLoader::_perf_classes_linked = nullptr; 109 PerfCounter* ClassLoader::_perf_class_link_time = nullptr; 110 PerfCounter* ClassLoader::_perf_class_link_selftime = nullptr; 111 PerfCounter* ClassLoader::_perf_shared_classload_time = nullptr; 112 PerfCounter* ClassLoader::_perf_sys_classload_time = nullptr; 113 PerfCounter* ClassLoader::_perf_app_classload_time = nullptr; 114 PerfCounter* ClassLoader::_perf_app_classload_selftime = nullptr; 115 PerfCounter* ClassLoader::_perf_app_classload_count = nullptr; 116 PerfCounter* ClassLoader::_perf_define_appclasses = nullptr; 117 PerfCounter* ClassLoader::_perf_define_appclass_time = nullptr; 118 PerfCounter* ClassLoader::_perf_define_appclass_selftime = nullptr; 119 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = nullptr; 120 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = nullptr; 121 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = nullptr; 122 123 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = nullptr; 124 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = nullptr; 125 ClassPathEntry* ClassLoader::_jrt_entry = nullptr; 126 127 ClassPathEntry* volatile ClassLoader::_first_append_entry_list = nullptr; 128 ClassPathEntry* volatile ClassLoader::_last_append_entry = nullptr; 129 #if INCLUDE_CDS 130 ClassPathEntry* ClassLoader::_app_classpath_entries = nullptr; 131 ClassPathEntry* ClassLoader::_last_app_classpath_entry = nullptr; 132 ClassPathEntry* ClassLoader::_module_path_entries = nullptr; 133 ClassPathEntry* ClassLoader::_last_module_path_entry = nullptr; 134 #endif 135 136 // helper routines 137 #if INCLUDE_CDS 138 static bool string_starts_with(const char* str, const char* str_to_find) { 139 size_t str_len = strlen(str); 140 size_t str_to_find_len = strlen(str_to_find); 141 if (str_to_find_len > str_len) { 142 return false; 143 } 144 return (strncmp(str, str_to_find, str_to_find_len) == 0); 145 } 146 #endif 147 148 static const char* get_jimage_version_string() { 149 static char version_string[10] = ""; 150 if (version_string[0] == '\0') { 151 jio_snprintf(version_string, sizeof(version_string), "%d.%d", 152 VM_Version::vm_major_version(), VM_Version::vm_minor_version()); 153 } 154 return (const char*)version_string; 155 } 156 157 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) { 158 size_t str_len = strlen(str); 159 size_t str_to_find_len = strlen(str_to_find); 160 if (str_to_find_len > str_len) { 161 return false; 162 } 163 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0); 164 } 165 166 // Used to obtain the package name from a fully qualified class name. 167 Symbol* ClassLoader::package_from_class_name(const Symbol* name, bool* bad_class_name) { 168 if (name == nullptr) { 169 if (bad_class_name != nullptr) { 170 *bad_class_name = true; 171 } 172 return nullptr; 173 } 174 175 int utf_len = name->utf8_length(); 176 const jbyte* base = (const jbyte*)name->base(); 177 const jbyte* start = base; 178 const jbyte* end = UTF8::strrchr(start, utf_len, JVM_SIGNATURE_SLASH); 179 if (end == nullptr) { 180 return nullptr; 181 } 182 // Skip over '['s 183 if (*start == JVM_SIGNATURE_ARRAY) { 184 do { 185 start++; 186 } while (start < end && *start == JVM_SIGNATURE_ARRAY); 187 188 // Fully qualified class names should not contain a 'L'. 189 // Set bad_class_name to true to indicate that the package name 190 // could not be obtained due to an error condition. 191 // In this situation, is_same_class_package returns false. 192 if (*start == JVM_SIGNATURE_CLASS) { 193 if (bad_class_name != nullptr) { 194 *bad_class_name = true; 195 } 196 return nullptr; 197 } 198 } 199 // A class name could have just the slash character in the name, 200 // in which case start > end 201 if (start >= end) { 202 // No package name 203 if (bad_class_name != nullptr) { 204 *bad_class_name = true; 205 } 206 return nullptr; 207 } 208 return SymbolTable::new_symbol(name, pointer_delta_as_int(start, base), pointer_delta_as_int(end, base)); 209 } 210 211 // Given a fully qualified package name, find its defining package in the class loader's 212 // package entry table. 213 PackageEntry* ClassLoader::get_package_entry(Symbol* pkg_name, ClassLoaderData* loader_data) { 214 if (pkg_name == nullptr) { 215 return nullptr; 216 } 217 PackageEntryTable* pkgEntryTable = loader_data->packages(); 218 return pkgEntryTable->lookup_only(pkg_name); 219 } 220 221 const char* ClassPathEntry::copy_path(const char* path) { 222 char* copy = NEW_C_HEAP_ARRAY(char, strlen(path)+1, mtClass); 223 strcpy(copy, path); 224 return copy; 225 } 226 227 ClassPathDirEntry::~ClassPathDirEntry() { 228 FREE_C_HEAP_ARRAY(char, _dir); 229 } 230 231 ClassFileStream* ClassPathDirEntry::open_stream(JavaThread* current, const char* name) { 232 // construct full path name 233 assert((_dir != nullptr) && (name != nullptr), "sanity"); 234 size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1; 235 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(current, char, path_len); 236 int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name); 237 assert(len == (int)(path_len - 1), "sanity"); 238 // check if file exists 239 struct stat st; 240 if (os::stat(path, &st) == 0) { 241 // found file, open it 242 int file_handle = os::open(path, 0, 0); 243 if (file_handle != -1) { 244 // read contents into resource array 245 u1* buffer = NEW_RESOURCE_ARRAY_IN_THREAD(current, u1, st.st_size); 246 size_t num_read = ::read(file_handle, (char*) buffer, st.st_size); 247 // close file 248 ::close(file_handle); 249 // construct ClassFileStream 250 if (num_read == (size_t)st.st_size) { 251 if (UsePerfData) { 252 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read); 253 } 254 #ifdef ASSERT 255 // Freeing path is a no-op here as buffer prevents it from being reclaimed. But we keep it for 256 // debug builds so that we guard against use-after-free bugs. 257 FREE_RESOURCE_ARRAY_IN_THREAD(current, char, path, path_len); 258 #endif 259 // We don't verify the length of the classfile stream fits in an int, but this is the 260 // bootloader so we have control of this. 261 // Resource allocated 262 return new ClassFileStream(buffer, 263 checked_cast<int>(st.st_size), 264 _dir, 265 ClassFileStream::verify); 266 } 267 } 268 } 269 FREE_RESOURCE_ARRAY_IN_THREAD(current, char, path, path_len); 270 return nullptr; 271 } 272 273 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, 274 bool is_boot_append, bool from_class_path_attr) : ClassPathEntry() { 275 _zip = zip; 276 _zip_name = copy_path(zip_name); 277 _from_class_path_attr = from_class_path_attr; 278 } 279 280 ClassPathZipEntry::~ClassPathZipEntry() { 281 ZipLibrary::close(_zip); 282 FREE_C_HEAP_ARRAY(char, _zip_name); 283 } 284 285 u1* ClassPathZipEntry::open_entry(JavaThread* current, const char* name, jint* filesize, bool nul_terminate) { 286 // enable call to C land 287 ThreadToNativeFromVM ttn(current); 288 // check whether zip archive contains name 289 jint name_len; 290 jzentry* entry = ZipLibrary::find_entry(_zip, name, filesize, &name_len); 291 if (entry == nullptr) return nullptr; 292 u1* buffer; 293 char name_buf[128]; 294 char* filename; 295 if (name_len < 128) { 296 filename = name_buf; 297 } else { 298 filename = NEW_RESOURCE_ARRAY(char, name_len + 1); 299 } 300 301 // read contents into resource array 302 size_t size = (uint32_t)(*filesize); 303 if (nul_terminate) { 304 if (sizeof(size) == sizeof(uint32_t) && size == UINT_MAX) { 305 return nullptr; // 32-bit integer overflow will occur. 306 } 307 size++; 308 } 309 buffer = NEW_RESOURCE_ARRAY(u1, size); 310 if (!ZipLibrary::read_entry(_zip, entry, buffer, filename)) { 311 return nullptr; 312 } 313 314 // return result 315 if (nul_terminate) { 316 buffer[size - 1] = 0; 317 } 318 return buffer; 319 } 320 321 ClassFileStream* ClassPathZipEntry::open_stream(JavaThread* current, const char* name) { 322 jint filesize; 323 u1* buffer = open_entry(current, name, &filesize, false); 324 if (buffer == nullptr) { 325 return nullptr; 326 } 327 if (UsePerfData) { 328 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize); 329 } 330 // Resource allocated 331 return new ClassFileStream(buffer, 332 filesize, 333 _zip_name, 334 ClassFileStream::verify); 335 } 336 337 DEBUG_ONLY(ClassPathImageEntry* ClassPathImageEntry::_singleton = nullptr;) 338 339 JImageFile* ClassPathImageEntry::jimage() const { 340 return JImage_file; 341 } 342 343 JImageFile* ClassPathImageEntry::jimage_non_null() const { 344 assert(ClassLoader::has_jrt_entry(), "must be"); 345 assert(jimage() != nullptr, "should have been opened by ClassLoader::lookup_vm_options " 346 "and remained throughout normal JVM lifetime"); 347 return jimage(); 348 } 349 350 void ClassPathImageEntry::close_jimage() { 351 if (jimage() != nullptr) { 352 (*JImageClose)(jimage()); 353 JImage_file = nullptr; 354 } 355 } 356 357 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) : 358 ClassPathEntry() { 359 guarantee(jimage != nullptr, "jimage file is null"); 360 guarantee(name != nullptr, "jimage file name is null"); 361 assert(_singleton == nullptr, "VM supports only one jimage"); 362 DEBUG_ONLY(_singleton = this); 363 size_t len = strlen(name) + 1; 364 _name = copy_path(name); 365 } 366 367 ClassFileStream* ClassPathImageEntry::open_stream(JavaThread* current, const char* name) { 368 return open_stream_for_loader(current, name, ClassLoaderData::the_null_class_loader_data()); 369 } 370 371 // For a class in a named module, look it up in the jimage file using this syntax: 372 // /<module-name>/<package-name>/<base-class> 373 // 374 // Assumptions: 375 // 1. There are no unnamed modules in the jimage file. 376 // 2. A package is in at most one module in the jimage file. 377 // 378 ClassFileStream* ClassPathImageEntry::open_stream_for_loader(JavaThread* current, const char* name, ClassLoaderData* loader_data) { 379 jlong size; 380 JImageLocationRef location = (*JImageFindResource)(jimage_non_null(), "", get_jimage_version_string(), name, &size); 381 382 if (location == 0) { 383 TempNewSymbol class_name = SymbolTable::new_symbol(name); 384 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name); 385 386 if (pkg_name != nullptr) { 387 if (!Universe::is_module_initialized()) { 388 location = (*JImageFindResource)(jimage_non_null(), JAVA_BASE_NAME, get_jimage_version_string(), name, &size); 389 } else { 390 PackageEntry* package_entry = ClassLoader::get_package_entry(pkg_name, loader_data); 391 if (package_entry != nullptr) { 392 ResourceMark rm(current); 393 // Get the module name 394 ModuleEntry* module = package_entry->module(); 395 assert(module != nullptr, "Boot classLoader package missing module"); 396 assert(module->is_named(), "Boot classLoader package is in unnamed module"); 397 const char* module_name = module->name()->as_C_string(); 398 if (module_name != nullptr) { 399 location = (*JImageFindResource)(jimage_non_null(), module_name, get_jimage_version_string(), name, &size); 400 } 401 } 402 } 403 } 404 } 405 if (location != 0) { 406 if (UsePerfData) { 407 ClassLoader::perf_sys_classfile_bytes_read()->inc(size); 408 } 409 char* data = NEW_RESOURCE_ARRAY(char, size); 410 (*JImageGetResource)(jimage_non_null(), location, data, size); 411 // Resource allocated 412 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be"); 413 return new ClassFileStream((u1*)data, 414 checked_cast<int>(size), 415 _name, 416 ClassFileStream::verify, 417 true); // from_boot_loader_modules_image 418 } 419 420 return nullptr; 421 } 422 423 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf, 424 const char* module_name, 425 const char* file_name, 426 jlong &size) { 427 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size)); 428 } 429 430 bool ClassPathImageEntry::is_modules_image() const { 431 assert(this == _singleton, "VM supports a single jimage"); 432 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be used for jrt entry"); 433 return true; 434 } 435 436 #if INCLUDE_CDS 437 void ClassLoader::exit_with_path_failure(const char* error, const char* message) { 438 assert(CDSConfig::is_dumping_archive(), "sanity"); 439 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure"); 440 vm_exit_during_initialization(error, message); 441 } 442 #endif 443 444 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) { 445 _module_name = module_name; 446 _module_first_entry = nullptr; 447 _module_last_entry = nullptr; 448 } 449 450 ModuleClassPathList::~ModuleClassPathList() { 451 // Clean out each ClassPathEntry on list 452 ClassPathEntry* e = _module_first_entry; 453 while (e != nullptr) { 454 ClassPathEntry* next_entry = e->next(); 455 delete e; 456 e = next_entry; 457 } 458 } 459 460 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) { 461 if (new_entry != nullptr) { 462 if (_module_last_entry == nullptr) { 463 _module_first_entry = _module_last_entry = new_entry; 464 } else { 465 _module_last_entry->set_next(new_entry); 466 _module_last_entry = new_entry; 467 } 468 } 469 } 470 471 void ClassLoader::trace_class_path(const char* msg, const char* name) { 472 LogTarget(Info, class, path) lt; 473 if (lt.is_enabled()) { 474 LogStream ls(lt); 475 if (msg) { 476 ls.print("%s", msg); 477 } 478 if (name) { 479 if (strlen(name) < 256) { 480 ls.print("%s", name); 481 } else { 482 // For very long paths, we need to print each character separately, 483 // as print_cr() has a length limit 484 while (name[0] != '\0') { 485 ls.print("%c", name[0]); 486 name++; 487 } 488 } 489 } 490 ls.cr(); 491 } 492 } 493 494 void ClassLoader::setup_bootstrap_search_path(JavaThread* current) { 495 const char* bootcp = Arguments::get_boot_class_path(); 496 assert(bootcp != nullptr, "Boot class path must not be nullptr"); 497 if (PrintSharedArchiveAndExit) { 498 // Don't print bootcp - this is the bootcp of this current VM process, not necessarily 499 // the same as the boot classpath of the shared archive. 500 } else { 501 trace_class_path("bootstrap loader class path=", bootcp); 502 } 503 setup_bootstrap_search_path_impl(current, bootcp); 504 } 505 506 #if INCLUDE_CDS 507 void ClassLoader::setup_app_search_path(JavaThread* current, const char *class_path) { 508 assert(CDSConfig::is_dumping_archive(), "sanity"); 509 510 ResourceMark rm(current); 511 ClasspathStream cp_stream(class_path); 512 513 while (cp_stream.has_next()) { 514 const char* path = cp_stream.get_next(); 515 update_class_path_entry_list(current, path, /* check_for_duplicates */ true, 516 /* is_boot_append */ false, /* from_class_path_attr */ false); 517 } 518 } 519 520 void ClassLoader::add_to_module_path_entries(const char* path, 521 ClassPathEntry* entry) { 522 assert(entry != nullptr, "ClassPathEntry should not be nullptr"); 523 assert(CDSConfig::is_dumping_archive(), "sanity"); 524 525 // The entry does not exist, add to the list 526 if (_module_path_entries == nullptr) { 527 assert(_last_module_path_entry == nullptr, "Sanity"); 528 _module_path_entries = _last_module_path_entry = entry; 529 } else { 530 _last_module_path_entry->set_next(entry); 531 _last_module_path_entry = entry; 532 } 533 } 534 535 // Add a module path to the _module_path_entries list. 536 void ClassLoader::setup_module_search_path(JavaThread* current, const char* path) { 537 assert(CDSConfig::is_dumping_archive(), "sanity"); 538 struct stat st; 539 if (os::stat(path, &st) != 0) { 540 tty->print_cr("os::stat error %d (%s). CDS dump aborted (path was \"%s\").", 541 errno, os::errno_name(errno), path); 542 vm_exit_during_initialization(); 543 } 544 // File or directory found 545 ClassPathEntry* new_entry = nullptr; 546 new_entry = create_class_path_entry(current, path, &st, 547 false /*is_boot_append */, false /* from_class_path_attr */); 548 if (new_entry != nullptr) { 549 add_to_module_path_entries(path, new_entry); 550 } 551 } 552 553 #endif // INCLUDE_CDS 554 555 void ClassLoader::close_jrt_image() { 556 // Not applicable for exploded builds 557 if (!ClassLoader::has_jrt_entry()) return; 558 _jrt_entry->close_jimage(); 559 } 560 561 // Construct the array of module/path pairs as specified to --patch-module 562 // for the boot loader to search ahead of the jimage, if the class being 563 // loaded is defined to a module that has been specified to --patch-module. 564 void ClassLoader::setup_patch_mod_entries() { 565 JavaThread* current = JavaThread::current(); 566 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix(); 567 int num_of_entries = patch_mod_args->length(); 568 569 // Set up the boot loader's _patch_mod_entries list 570 _patch_mod_entries = new (mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, mtModule); 571 572 for (int i = 0; i < num_of_entries; i++) { 573 const char* module_name = (patch_mod_args->at(i))->module_name(); 574 Symbol* const module_sym = SymbolTable::new_symbol(module_name); 575 assert(module_sym != nullptr, "Failed to obtain Symbol for module name"); 576 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym); 577 578 char* class_path = (patch_mod_args->at(i))->path_string(); 579 ResourceMark rm(current); 580 ClasspathStream cp_stream(class_path); 581 582 while (cp_stream.has_next()) { 583 const char* path = cp_stream.get_next(); 584 struct stat st; 585 if (os::stat(path, &st) == 0) { 586 // File or directory found 587 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st, false, false); 588 // If the path specification is valid, enter it into this module's list 589 if (new_entry != nullptr) { 590 module_cpl->add_to_list(new_entry); 591 } 592 } 593 } 594 595 // Record the module into the list of --patch-module entries only if 596 // valid ClassPathEntrys have been created 597 if (module_cpl->module_first_entry() != nullptr) { 598 _patch_mod_entries->push(module_cpl); 599 } 600 } 601 } 602 603 // Determine whether the module has been patched via the command-line 604 // option --patch-module 605 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) { 606 if (_patch_mod_entries != nullptr && _patch_mod_entries->is_nonempty()) { 607 int table_len = _patch_mod_entries->length(); 608 for (int i = 0; i < table_len; i++) { 609 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i); 610 if (module_name->fast_compare(patch_mod->module_name()) == 0) { 611 return true; 612 } 613 } 614 } 615 return false; 616 } 617 618 // Set up the _jrt_entry if present and boot append path 619 void ClassLoader::setup_bootstrap_search_path_impl(JavaThread* current, const char *class_path) { 620 ResourceMark rm(current); 621 ClasspathStream cp_stream(class_path); 622 bool set_base_piece = true; 623 624 #if INCLUDE_CDS 625 if (CDSConfig::is_dumping_archive()) { 626 if (!Arguments::has_jimage()) { 627 vm_exit_during_initialization("CDS is not supported in exploded JDK build", nullptr); 628 } 629 } 630 #endif 631 632 while (cp_stream.has_next()) { 633 const char* path = cp_stream.get_next(); 634 635 if (set_base_piece) { 636 // The first time through the bootstrap_search setup, it must be determined 637 // what the base or core piece of the boot loader search is. Either a java runtime 638 // image is present or this is an exploded module build situation. 639 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME), 640 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build"); 641 struct stat st; 642 if (os::stat(path, &st) == 0) { 643 // Directory found 644 if (JImage_file != nullptr) { 645 assert(Arguments::has_jimage(), "sanity check"); 646 const char* canonical_path = get_canonical_path(path, current); 647 assert(canonical_path != nullptr, "canonical_path issue"); 648 649 _jrt_entry = new ClassPathImageEntry(JImage_file, canonical_path); 650 assert(_jrt_entry != nullptr && _jrt_entry->is_modules_image(), "No java runtime image present"); 651 assert(_jrt_entry->jimage() != nullptr, "No java runtime image"); 652 } // else it's an exploded build. 653 } else { 654 // If path does not exist, exit 655 vm_exit_during_initialization("Unable to establish the boot loader search path", path); 656 } 657 set_base_piece = false; 658 } else { 659 // Every entry on the boot class path after the initial base piece, 660 // which is set by os::set_boot_path(), is considered an appended entry. 661 update_class_path_entry_list(current, path, /* check_for_duplicates */ false, 662 /* is_boot_append */ true, /* from_class_path_attr */ false); 663 } 664 } 665 } 666 667 // Gets the exploded path for the named module. The memory for the path 668 // is allocated on the C heap if `c_heap` is true otherwise in the resource area. 669 static const char* get_exploded_module_path(const char* module_name, bool c_heap) { 670 const char *home = Arguments::get_java_home(); 671 const char file_sep = os::file_separator()[0]; 672 // 10 represents the length of "modules" + 2 file separators + \0 673 size_t len = strlen(home) + strlen(module_name) + 10; 674 char *path = c_heap ? NEW_C_HEAP_ARRAY(char, len, mtModule) : NEW_RESOURCE_ARRAY(char, len); 675 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name); 676 return path; 677 } 678 679 // During an exploded modules build, each module defined to the boot loader 680 // will be added to the ClassLoader::_exploded_entries array. 681 void ClassLoader::add_to_exploded_build_list(JavaThread* current, Symbol* module_sym) { 682 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable"); 683 assert(_exploded_entries != nullptr, "_exploded_entries was not initialized"); 684 685 // Find the module's symbol 686 ResourceMark rm(current); 687 const char *module_name = module_sym->as_C_string(); 688 const char *path = get_exploded_module_path(module_name, false); 689 690 struct stat st; 691 if (os::stat(path, &st) == 0) { 692 // Directory found 693 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st, false, false); 694 695 // If the path specification is valid, enter it into this module's list. 696 // There is no need to check for duplicate modules in the exploded entry list, 697 // since no two modules with the same name can be defined to the boot loader. 698 // This is checked at module definition time in Modules::define_module. 699 if (new_entry != nullptr) { 700 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym); 701 module_cpl->add_to_list(new_entry); 702 { 703 MutexLocker ml(current, Module_lock); 704 _exploded_entries->push(module_cpl); 705 } 706 log_info(class, load)("path: %s", path); 707 } 708 } 709 } 710 711 jzfile* ClassLoader::open_zip_file(const char* canonical_path, char** error_msg, JavaThread* thread) { 712 // enable call to C land 713 ThreadToNativeFromVM ttn(thread); 714 HandleMark hm(thread); 715 return ZipLibrary::open(canonical_path, error_msg); 716 } 717 718 ClassPathEntry* ClassLoader::create_class_path_entry(JavaThread* current, 719 const char *path, const struct stat* st, 720 bool is_boot_append, 721 bool from_class_path_attr) { 722 ClassPathEntry* new_entry = nullptr; 723 if ((st->st_mode & S_IFMT) == S_IFREG) { 724 ResourceMark rm(current); 725 // Regular file, should be a zip file 726 // Canonicalized filename 727 const char* canonical_path = get_canonical_path(path, current); 728 if (canonical_path == nullptr) { 729 return nullptr; 730 } 731 char* error_msg = nullptr; 732 jzfile* zip = open_zip_file(canonical_path, &error_msg, current); 733 if (zip != nullptr && error_msg == nullptr) { 734 new_entry = new ClassPathZipEntry(zip, path, is_boot_append, from_class_path_attr); 735 } else { 736 #if INCLUDE_CDS 737 ClassLoaderExt::set_has_non_jar_in_classpath(); 738 #endif 739 return nullptr; 740 } 741 log_info(class, path)("opened: %s", path); 742 log_info(class, load)("opened: %s", path); 743 } else { 744 // Directory 745 new_entry = new ClassPathDirEntry(path); 746 log_info(class, load)("path: %s", path); 747 } 748 return new_entry; 749 } 750 751 752 // Create a class path zip entry for a given path (return null if not found 753 // or zip/JAR file cannot be opened) 754 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) { 755 // check for a regular file 756 struct stat st; 757 if (os::stat(path, &st) == 0) { 758 if ((st.st_mode & S_IFMT) == S_IFREG) { 759 JavaThread* thread = JavaThread::current(); 760 ResourceMark rm(thread); 761 const char* canonical_path = get_canonical_path(path, thread); 762 if (canonical_path != nullptr) { 763 char* error_msg = nullptr; 764 jzfile* zip = open_zip_file(canonical_path, &error_msg, thread); 765 if (zip != nullptr && error_msg == nullptr) { 766 // create using canonical path 767 return new ClassPathZipEntry(zip, canonical_path, is_boot_append, false); 768 } 769 } 770 } 771 } 772 return nullptr; 773 } 774 775 // The boot append entries are added with a lock, and read lock free. 776 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) { 777 if (new_entry != nullptr) { 778 MutexLocker ml(Bootclasspath_lock, Mutex::_no_safepoint_check_flag); 779 if (_last_append_entry == nullptr) { 780 _last_append_entry = new_entry; 781 assert(first_append_entry() == nullptr, "boot loader's append class path entry list not empty"); 782 Atomic::release_store(&_first_append_entry_list, new_entry); 783 } else { 784 _last_append_entry->set_next(new_entry); 785 _last_append_entry = new_entry; 786 } 787 } 788 } 789 790 // Record the path entries specified in -cp during dump time. The recorded 791 // information will be used at runtime for loading the archived app classes. 792 // 793 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for 794 // loading app classes. Instead, the app class are loaded by the 795 // jdk/internal/loader/ClassLoaders$AppClassLoader instance. 796 bool ClassLoader::add_to_app_classpath_entries(JavaThread* current, 797 ClassPathEntry* entry, 798 bool check_for_duplicates) { 799 #if INCLUDE_CDS 800 assert(entry != nullptr, "ClassPathEntry should not be nullptr"); 801 ClassPathEntry* e = _app_classpath_entries; 802 if (check_for_duplicates) { 803 while (e != nullptr) { 804 if (strcmp(e->name(), entry->name()) == 0) { 805 // entry already exists 806 return false; 807 } 808 e = e->next(); 809 } 810 } 811 812 // The entry does not exist, add to the list 813 if (_app_classpath_entries == nullptr) { 814 assert(_last_app_classpath_entry == nullptr, "Sanity"); 815 _app_classpath_entries = _last_app_classpath_entry = entry; 816 } else { 817 _last_app_classpath_entry->set_next(entry); 818 _last_app_classpath_entry = entry; 819 } 820 821 if (entry->is_jar_file()) { 822 ClassLoaderExt::process_jar_manifest(current, entry); 823 } 824 #endif 825 return true; 826 } 827 828 // Returns true IFF the file/dir exists and the entry was successfully created. 829 bool ClassLoader::update_class_path_entry_list(JavaThread* current, 830 const char *path, 831 bool check_for_duplicates, 832 bool is_boot_append, 833 bool from_class_path_attr) { 834 struct stat st; 835 if (os::stat(path, &st) == 0) { 836 // File or directory found 837 ClassPathEntry* new_entry = nullptr; 838 new_entry = create_class_path_entry(current, path, &st, is_boot_append, from_class_path_attr); 839 if (new_entry == nullptr) { 840 return false; 841 } 842 843 // Do not reorder the bootclasspath which would break get_system_package(). 844 // Add new entry to linked list 845 if (is_boot_append) { 846 add_to_boot_append_entries(new_entry); 847 } else { 848 if (!add_to_app_classpath_entries(current, new_entry, check_for_duplicates)) { 849 // new_entry is not saved, free it now 850 delete new_entry; 851 } 852 } 853 return true; 854 } else { 855 return false; 856 } 857 } 858 859 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) { 860 ResourceMark rm; 861 int num_of_entries = module_list->length(); 862 for (int i = 0; i < num_of_entries; i++) { 863 ClassPathEntry* e; 864 ModuleClassPathList* mpl = module_list->at(i); 865 tty->print("%s=", mpl->module_name()->as_C_string()); 866 e = mpl->module_first_entry(); 867 while (e != nullptr) { 868 tty->print("%s", e->name()); 869 e = e->next(); 870 if (e != nullptr) { 871 tty->print("%s", os::path_separator()); 872 } 873 } 874 tty->print(" ;"); 875 } 876 } 877 878 void ClassLoader::print_bootclasspath() { 879 ClassPathEntry* e; 880 tty->print("[bootclasspath= "); 881 882 // Print --patch-module module/path specifications first 883 if (_patch_mod_entries != nullptr) { 884 print_module_entry_table(_patch_mod_entries); 885 } 886 887 // [jimage | exploded modules build] 888 if (has_jrt_entry()) { 889 // Print the location of the java runtime image 890 tty->print("%s ;", _jrt_entry->name()); 891 } else { 892 // Print exploded module build path specifications 893 if (_exploded_entries != nullptr) { 894 print_module_entry_table(_exploded_entries); 895 } 896 } 897 898 // appended entries 899 e = first_append_entry(); 900 while (e != nullptr) { 901 tty->print("%s ;", e->name()); 902 e = e->next(); 903 } 904 tty->print_cr("]"); 905 } 906 907 void* ClassLoader::dll_lookup(void* lib, const char* name, const char* path) { 908 void* func = os::dll_lookup(lib, name); 909 if (func == nullptr) { 910 char msg[256] = ""; 911 jio_snprintf(msg, sizeof(msg), "Could not resolve \"%s\"", name); 912 vm_exit_during_initialization(msg, path); 913 } 914 return func; 915 } 916 917 void ClassLoader::load_java_library() { 918 assert(CanonicalizeEntry == nullptr, "should not load java library twice"); 919 void *javalib_handle = os::native_java_library(); 920 if (javalib_handle == nullptr) { 921 vm_exit_during_initialization("Unable to load java library", nullptr); 922 } 923 924 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, dll_lookup(javalib_handle, "JDK_Canonicalize", nullptr)); 925 } 926 927 void ClassLoader::load_jimage_library() { 928 assert(JImageOpen == nullptr, "should not load jimage library twice"); 929 char path[JVM_MAXPATHLEN]; 930 char ebuf[1024]; 931 void* handle = nullptr; 932 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) { 933 handle = os::dll_load(path, ebuf, sizeof ebuf); 934 } 935 if (handle == nullptr) { 936 vm_exit_during_initialization("Unable to load jimage library", path); 937 } 938 939 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, dll_lookup(handle, "JIMAGE_Open", path)); 940 JImageClose = CAST_TO_FN_PTR(JImageClose_t, dll_lookup(handle, "JIMAGE_Close", path)); 941 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, dll_lookup(handle, "JIMAGE_FindResource", path)); 942 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, dll_lookup(handle, "JIMAGE_GetResource", path)); 943 } 944 945 int ClassLoader::crc32(int crc, const char* buf, int len) { 946 return ZipLibrary::crc32(crc, (const jbyte*)buf, len); 947 } 948 949 oop ClassLoader::get_system_package(const char* name, TRAPS) { 950 // Look up the name in the boot loader's package entry table. 951 if (name != nullptr) { 952 TempNewSymbol package_sym = SymbolTable::new_symbol(name); 953 // Look for the package entry in the boot loader's package entry table. 954 PackageEntry* package = 955 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym); 956 957 // Return null if package does not exist or if no classes in that package 958 // have been loaded. 959 if (package != nullptr && package->has_loaded_class()) { 960 ModuleEntry* module = package->module(); 961 if (module->location() != nullptr) { 962 ResourceMark rm(THREAD); 963 Handle ml = java_lang_String::create_from_str( 964 module->location()->as_C_string(), THREAD); 965 return ml(); 966 } 967 // Return entry on boot loader class path. 968 Handle cph = java_lang_String::create_from_str( 969 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD); 970 return cph(); 971 } 972 } 973 return nullptr; 974 } 975 976 objArrayOop ClassLoader::get_system_packages(TRAPS) { 977 ResourceMark rm(THREAD); 978 // List of pointers to PackageEntrys that have loaded classes. 979 PackageEntryTable* pe_table = 980 ClassLoaderData::the_null_class_loader_data()->packages(); 981 GrowableArray<PackageEntry*>* loaded_class_pkgs = pe_table->get_system_packages(); 982 983 // Allocate objArray and fill with java.lang.String 984 objArrayOop r = oopFactory::new_objArray(vmClasses::String_klass(), 985 loaded_class_pkgs->length(), CHECK_NULL); 986 objArrayHandle result(THREAD, r); 987 for (int x = 0; x < loaded_class_pkgs->length(); x++) { 988 PackageEntry* package_entry = loaded_class_pkgs->at(x); 989 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL); 990 result->obj_at_put(x, str()); 991 } 992 return result(); 993 } 994 995 // caller needs ResourceMark 996 const char* ClassLoader::file_name_for_class_name(const char* class_name, 997 int class_name_len) { 998 assert(class_name != nullptr, "invariant"); 999 assert((int)strlen(class_name) == class_name_len, "invariant"); 1000 1001 static const char class_suffix[] = ".class"; 1002 size_t class_suffix_len = sizeof(class_suffix); 1003 1004 char* const file_name = NEW_RESOURCE_ARRAY(char, 1005 class_name_len + 1006 class_suffix_len); // includes term null 1007 1008 strncpy(file_name, class_name, class_name_len); 1009 strncpy(&file_name[class_name_len], class_suffix, class_suffix_len); 1010 1011 return file_name; 1012 } 1013 1014 static ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry, 1015 const GrowableArray<ModuleClassPathList*>* const module_list) { 1016 int num_of_entries = module_list->length(); 1017 const Symbol* class_module_name = mod_entry->name(); 1018 1019 // Loop through all the modules in either the patch-module or exploded entries looking for module 1020 for (int i = 0; i < num_of_entries; i++) { 1021 ModuleClassPathList* module_cpl = module_list->at(i); 1022 Symbol* module_cpl_name = module_cpl->module_name(); 1023 1024 if (module_cpl_name->fast_compare(class_module_name) == 0) { 1025 // Class' module has been located. 1026 return module_cpl->module_first_entry(); 1027 } 1028 } 1029 return nullptr; 1030 } 1031 1032 1033 // Search either the patch-module or exploded build entries for class. 1034 ClassFileStream* ClassLoader::search_module_entries(JavaThread* current, 1035 const GrowableArray<ModuleClassPathList*>* const module_list, 1036 const char* const class_name, 1037 const char* const file_name) { 1038 ClassFileStream* stream = nullptr; 1039 1040 // Find the class' defining module in the boot loader's module entry table 1041 TempNewSymbol class_name_symbol = SymbolTable::new_symbol(class_name); 1042 TempNewSymbol pkg_name = package_from_class_name(class_name_symbol); 1043 PackageEntry* pkg_entry = get_package_entry(pkg_name, ClassLoaderData::the_null_class_loader_data()); 1044 ModuleEntry* mod_entry = (pkg_entry != nullptr) ? pkg_entry->module() : nullptr; 1045 1046 // If the module system has not defined java.base yet, then 1047 // classes loaded are assumed to be defined to java.base. 1048 // When java.base is eventually defined by the module system, 1049 // all packages of classes that have been previously loaded 1050 // are verified in ModuleEntryTable::verify_javabase_packages(). 1051 if (!Universe::is_module_initialized() && 1052 !ModuleEntryTable::javabase_defined() && 1053 mod_entry == nullptr) { 1054 mod_entry = ModuleEntryTable::javabase_moduleEntry(); 1055 } 1056 1057 // The module must be a named module 1058 ClassPathEntry* e = nullptr; 1059 if (mod_entry != nullptr && mod_entry->is_named()) { 1060 if (module_list == _exploded_entries) { 1061 // The exploded build entries can be added to at any time so a lock is 1062 // needed when searching them. 1063 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build"); 1064 MutexLocker ml(current, Module_lock); 1065 e = find_first_module_cpe(mod_entry, module_list); 1066 } else { 1067 e = find_first_module_cpe(mod_entry, module_list); 1068 } 1069 } 1070 1071 // Try to load the class from the module's ClassPathEntry list. 1072 while (e != nullptr) { 1073 stream = e->open_stream(current, file_name); 1074 // No context.check is required since CDS is not supported 1075 // for an exploded modules build or if --patch-module is specified. 1076 if (nullptr != stream) { 1077 return stream; 1078 } 1079 e = e->next(); 1080 } 1081 // If the module was located, break out even if the class was not 1082 // located successfully from that module's ClassPathEntry list. 1083 // There will not be another valid entry for that module. 1084 return nullptr; 1085 } 1086 1087 // Called by the boot classloader to load classes 1088 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) { 1089 assert(name != nullptr, "invariant"); 1090 1091 ResourceMark rm(THREAD); 1092 HandleMark hm(THREAD); 1093 1094 const char* const class_name = name->as_C_string(); 1095 1096 EventMarkClassLoading m("Loading class %s", class_name); 1097 1098 const char* const file_name = file_name_for_class_name(class_name, 1099 name->utf8_length()); 1100 assert(file_name != nullptr, "invariant"); 1101 1102 // Lookup stream for parsing .class file 1103 ClassFileStream* stream = nullptr; 1104 s2 classpath_index = 0; 1105 ClassPathEntry* e = nullptr; 1106 bool is_patched = false; 1107 1108 // If search_append_only is true, boot loader visibility boundaries are 1109 // set to be _first_append_entry to the end. This includes: 1110 // [-Xbootclasspath/a]; [jvmti appended entries] 1111 // 1112 // If search_append_only is false, boot loader visibility boundaries are 1113 // set to be the --patch-module entries plus the base piece. This includes: 1114 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build] 1115 // 1116 1117 // Load Attempt #1: --patch-module 1118 // Determine the class' defining module. If it appears in the _patch_mod_entries, 1119 // attempt to load the class from those locations specific to the module. 1120 // Specifications to --patch-module can contain a partial number of classes 1121 // that are part of the overall module definition. So if a particular class is not 1122 // found within its module specification, the search should continue to Load Attempt #2. 1123 // Note: The --patch-module entries are never searched if the boot loader's 1124 // visibility boundary is limited to only searching the append entries. 1125 if (_patch_mod_entries != nullptr && !search_append_only) { 1126 // At CDS dump time, the --patch-module entries are ignored. That means a 1127 // class is still loaded from the runtime image even if it might 1128 // appear in the _patch_mod_entries. The runtime shared class visibility 1129 // check will determine if a shared class is visible based on the runtime 1130 // environment, including the runtime --patch-module setting. 1131 if (!CDSConfig::is_valhalla_preview()) { 1132 // Dynamic dumping requires UseSharedSpaces to be enabled. Since --patch-module 1133 // is not supported with UseSharedSpaces, we can never come here during dynamic dumping. 1134 assert(!CDSConfig::is_dumping_dynamic_archive(), "sanity"); 1135 } 1136 if (CDSConfig::is_valhalla_preview() || !CDSConfig::is_dumping_static_archive()) { 1137 stream = search_module_entries(THREAD, _patch_mod_entries, class_name, file_name); 1138 if (stream != nullptr) { 1139 is_patched = true; 1140 } 1141 } 1142 } 1143 1144 // Load Attempt #2: [jimage | exploded build] 1145 if (!search_append_only && (nullptr == stream)) { 1146 if (has_jrt_entry()) { 1147 e = _jrt_entry; 1148 stream = _jrt_entry->open_stream(THREAD, file_name); 1149 } else { 1150 // Exploded build - attempt to locate class in its defining module's location. 1151 assert(_exploded_entries != nullptr, "No exploded build entries present"); 1152 stream = search_module_entries(THREAD, _exploded_entries, class_name, file_name); 1153 } 1154 } 1155 1156 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries] 1157 if (search_append_only && (nullptr == stream)) { 1158 // For the boot loader append path search, the starting classpath_index 1159 // for the appended piece is always 1 to account for either the 1160 // _jrt_entry or the _exploded_entries. 1161 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly"); 1162 classpath_index = 1; 1163 1164 e = first_append_entry(); 1165 while (e != nullptr) { 1166 stream = e->open_stream(THREAD, file_name); 1167 if (nullptr != stream) { 1168 break; 1169 } 1170 e = e->next(); 1171 ++classpath_index; 1172 } 1173 } 1174 1175 if (nullptr == stream) { 1176 return nullptr; 1177 } 1178 1179 stream->set_verify(ClassLoaderExt::should_verify(classpath_index)); 1180 1181 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 1182 Handle protection_domain; 1183 ClassLoadInfo cl_info(protection_domain); 1184 1185 InstanceKlass* result = KlassFactory::create_from_stream(stream, 1186 name, 1187 loader_data, 1188 cl_info, 1189 CHECK_NULL); 1190 result->set_classpath_index(classpath_index); 1191 if (is_patched) { 1192 result->set_shared_classpath_index(0); 1193 result->set_shared_class_loader_type(ClassLoader::BOOT_LOADER); 1194 } 1195 return result; 1196 } 1197 1198 #if INCLUDE_CDS 1199 char* ClassLoader::skip_uri_protocol(char* source) { 1200 if (strncmp(source, "file:", 5) == 0) { 1201 // file: protocol path could start with file:/ or file:/// 1202 // locate the char after all the forward slashes 1203 int offset = 5; 1204 while (*(source + offset) == '/') { 1205 offset++; 1206 } 1207 source += offset; 1208 // for non-windows platforms, move back one char as the path begins with a '/' 1209 #ifndef _WINDOWS 1210 source -= 1; 1211 #endif 1212 } else if (strncmp(source, "jrt:/", 5) == 0) { 1213 source += 5; 1214 } 1215 return source; 1216 } 1217 1218 // Record the shared classpath index and loader type for classes loaded 1219 // by the builtin loaders at dump time. 1220 void ClassLoader::record_result(JavaThread* current, InstanceKlass* ik, 1221 const ClassFileStream* stream, bool redefined) { 1222 assert(CDSConfig::is_dumping_archive(), "sanity"); 1223 assert(stream != nullptr, "sanity"); 1224 1225 if (ik->is_hidden()) { 1226 // We do not archive hidden classes. 1227 return; 1228 } 1229 1230 if (ik->shared_classpath_index() == 0 && ik->is_shared_boot_class()) { 1231 return; 1232 } 1233 1234 oop loader = ik->class_loader(); 1235 char* src = (char*)stream->source(); 1236 if (src == nullptr) { 1237 if (loader == nullptr) { 1238 // JFR classes 1239 ik->set_shared_classpath_index(0); 1240 ik->set_shared_class_loader_type(ClassLoader::BOOT_LOADER); 1241 } 1242 return; 1243 } 1244 1245 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build"); 1246 1247 ResourceMark rm(current); 1248 int classpath_index = -1; 1249 PackageEntry* pkg_entry = ik->package(); 1250 1251 if (FileMapInfo::get_number_of_shared_paths() > 0) { 1252 // Save the path from the file: protocol or the module name from the jrt: protocol 1253 // if no protocol prefix is found, path is the same as stream->source(). This path 1254 // must be valid since the class has been successfully parsed. 1255 char* path = skip_uri_protocol(src); 1256 assert(path != nullptr, "sanity"); 1257 for (int i = 0; i < FileMapInfo::get_number_of_shared_paths(); i++) { 1258 SharedClassPathEntry* ent = FileMapInfo::shared_path(i); 1259 // A shared path has been validated during its creation in ClassLoader::create_class_path_entry(), 1260 // it must be valid here. 1261 assert(ent->name() != nullptr, "sanity"); 1262 // If the path (from the class stream source) is the same as the shared 1263 // class or module path, then we have a match. 1264 // src may come from the App/Platform class loaders, which would canonicalize 1265 // the file name. We cannot use strcmp to check for equality against ent->name(). 1266 // We must use os::same_files (which is faster than canonicalizing ent->name()). 1267 if (os::same_files(ent->name(), path)) { 1268 // null pkg_entry and pkg_entry in an unnamed module implies the class 1269 // is from the -cp or boot loader append path which consists of -Xbootclasspath/a 1270 // and jvmti appended entries. 1271 if ((pkg_entry == nullptr) || (pkg_entry->in_unnamed_module())) { 1272 // Ensure the index is within the -cp range before assigning 1273 // to the classpath_index. 1274 if (SystemDictionary::is_system_class_loader(loader) && 1275 (i >= ClassLoaderExt::app_class_paths_start_index()) && 1276 (i < ClassLoaderExt::app_module_paths_start_index())) { 1277 classpath_index = i; 1278 break; 1279 } else { 1280 if ((i >= 1) && 1281 (i < ClassLoaderExt::app_class_paths_start_index())) { 1282 // The class must be from boot loader append path which consists of 1283 // -Xbootclasspath/a and jvmti appended entries. 1284 assert(loader == nullptr, "sanity"); 1285 classpath_index = i; 1286 break; 1287 } 1288 } 1289 } else { 1290 // A class from a named module from the --module-path. Ensure the index is 1291 // within the --module-path range before assigning to the classpath_index. 1292 if ((pkg_entry != nullptr) && !(pkg_entry->in_unnamed_module()) && (i > 0)) { 1293 if (i >= ClassLoaderExt::app_module_paths_start_index() && 1294 i < FileMapInfo::get_number_of_shared_paths()) { 1295 classpath_index = i; 1296 break; 1297 } 1298 } 1299 } 1300 } 1301 // for index 0 and the stream->source() is the modules image or has the jrt: protocol. 1302 // The class must be from the runtime modules image. 1303 if (i == 0 && (stream->from_boot_loader_modules_image() || string_starts_with(src, "jrt:"))) { 1304 classpath_index = i; 1305 break; 1306 } 1307 } 1308 1309 // No path entry found for this class: most likely a shared class loaded by the 1310 // user defined classloader. 1311 if (classpath_index < 0 && !SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) { 1312 assert(ik->shared_classpath_index() < 0, "not assigned yet"); 1313 ik->set_shared_classpath_index(UNREGISTERED_INDEX); 1314 SystemDictionaryShared::set_shared_class_misc_info(ik, (ClassFileStream*)stream); 1315 return; 1316 } 1317 } else { 1318 // The shared path table is set up after module system initialization. 1319 // The path table contains no entry before that. Any classes loaded prior 1320 // to the setup of the shared path table must be from the modules image. 1321 if (!CDSConfig::is_valhalla_preview()) { 1322 assert(stream->from_boot_loader_modules_image(), "stream must be loaded by boot loader from modules image"); 1323 } 1324 assert(FileMapInfo::get_number_of_shared_paths() == 0, "shared path table must not have been setup"); 1325 classpath_index = 0; 1326 } 1327 1328 const char* const class_name = ik->name()->as_C_string(); 1329 const char* const file_name = file_name_for_class_name(class_name, 1330 ik->name()->utf8_length()); 1331 assert(file_name != nullptr, "invariant"); 1332 ClassLoaderExt::record_result(checked_cast<s2>(classpath_index), ik, redefined); 1333 } 1334 #endif // INCLUDE_CDS 1335 1336 // Initialize the class loader's access to methods in libzip. Parse and 1337 // process the boot classpath into a list ClassPathEntry objects. Once 1338 // this list has been created, it must not change order (see class PackageInfo) 1339 // it can be appended to and is by jvmti. 1340 1341 void ClassLoader::initialize(TRAPS) { 1342 if (UsePerfData) { 1343 // jvmstat performance counters 1344 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time"); 1345 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime"); 1346 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self"); 1347 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime"); 1348 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self"); 1349 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime"); 1350 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self"); 1351 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses"); 1352 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses"); 1353 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses"); 1354 1355 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime"); 1356 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime"); 1357 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime"); 1358 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self"); 1359 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount"); 1360 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses"); 1361 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime"); 1362 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self"); 1363 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes"); 1364 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes"); 1365 1366 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, "unsafeDefineClassCalls"); 1367 } 1368 1369 // lookup java library entry points 1370 load_java_library(); 1371 // jimage library entry points are loaded below, in lookup_vm_options 1372 setup_bootstrap_search_path(THREAD); 1373 } 1374 1375 static char* lookup_vm_resource(JImageFile *jimage, const char *jimage_version, const char *path) { 1376 jlong size; 1377 JImageLocationRef location = (*JImageFindResource)(jimage, "java.base", jimage_version, path, &size); 1378 if (location == 0) 1379 return nullptr; 1380 char *val = NEW_C_HEAP_ARRAY(char, size+1, mtClass); 1381 (*JImageGetResource)(jimage, location, val, size); 1382 val[size] = '\0'; 1383 return val; 1384 } 1385 1386 // Lookup VM options embedded in the modules jimage file 1387 char* ClassLoader::lookup_vm_options() { 1388 jint error; 1389 char modules_path[JVM_MAXPATHLEN]; 1390 const char* fileSep = os::file_separator(); 1391 1392 // Initialize jimage library entry points 1393 load_jimage_library(); 1394 1395 jio_snprintf(modules_path, JVM_MAXPATHLEN, "%s%slib%smodules", Arguments::get_java_home(), fileSep, fileSep); 1396 JImage_file =(*JImageOpen)(modules_path, &error); 1397 if (JImage_file == nullptr) { 1398 return nullptr; 1399 } 1400 1401 const char *jimage_version = get_jimage_version_string(); 1402 char *options = lookup_vm_resource(JImage_file, jimage_version, "jdk/internal/vm/options"); 1403 return options; 1404 } 1405 1406 bool ClassLoader::is_module_observable(const char* module_name) { 1407 assert(JImageOpen != nullptr, "jimage library should have been opened"); 1408 if (JImage_file == nullptr) { 1409 struct stat st; 1410 const char *path = get_exploded_module_path(module_name, true); 1411 bool res = os::stat(path, &st) == 0; 1412 FREE_C_HEAP_ARRAY(char, path); 1413 return res; 1414 } 1415 jlong size; 1416 const char *jimage_version = get_jimage_version_string(); 1417 return (*JImageFindResource)(JImage_file, module_name, jimage_version, "module-info.class", &size) != 0; 1418 } 1419 1420 #if INCLUDE_CDS 1421 void ClassLoader::initialize_shared_path(JavaThread* current) { 1422 if (CDSConfig::is_dumping_archive()) { 1423 ClassLoaderExt::setup_search_paths(current); 1424 } 1425 } 1426 1427 void ClassLoader::initialize_module_path(TRAPS) { 1428 if (CDSConfig::is_dumping_archive()) { 1429 ClassLoaderExt::setup_module_paths(THREAD); 1430 FileMapInfo::allocate_shared_path_table(CHECK); 1431 } 1432 } 1433 1434 // Helper function used by CDS code to get the number of module path 1435 // entries during shared classpath setup time. 1436 int ClassLoader::num_module_path_entries() { 1437 assert(CDSConfig::is_dumping_archive(), "sanity"); 1438 int num_entries = 0; 1439 ClassPathEntry* e= ClassLoader::_module_path_entries; 1440 while (e != nullptr) { 1441 num_entries ++; 1442 e = e->next(); 1443 } 1444 return num_entries; 1445 } 1446 #endif 1447 1448 jlong ClassLoader::classloader_time_ms() { 1449 return UsePerfData ? 1450 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1; 1451 } 1452 1453 jlong ClassLoader::class_init_count() { 1454 return UsePerfData ? _perf_classes_inited->get_value() : -1; 1455 } 1456 1457 jlong ClassLoader::class_init_time_ms() { 1458 return UsePerfData ? 1459 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1; 1460 } 1461 1462 jlong ClassLoader::class_verify_time_ms() { 1463 return UsePerfData ? 1464 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1; 1465 } 1466 1467 jlong ClassLoader::class_link_count() { 1468 return UsePerfData ? _perf_classes_linked->get_value() : -1; 1469 } 1470 1471 jlong ClassLoader::class_link_time_ms() { 1472 return UsePerfData ? 1473 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1; 1474 } 1475 1476 int ClassLoader::compute_Object_vtable() { 1477 // hardwired for JDK1.2 -- would need to duplicate class file parsing 1478 // code to determine actual value from file 1479 // Would be value '11' if finals were in vtable 1480 int JDK_1_2_Object_vtable_size = 5; 1481 return JDK_1_2_Object_vtable_size * vtableEntry::size(); 1482 } 1483 1484 1485 void classLoader_init1() { 1486 EXCEPTION_MARK; 1487 ClassLoader::initialize(THREAD); 1488 if (HAS_PENDING_EXCEPTION) { 1489 vm_exit_during_initialization("ClassLoader::initialize() failed unexpectedly"); 1490 } 1491 } 1492 1493 // Complete the ClassPathEntry setup for the boot loader 1494 void ClassLoader::classLoader_init2(JavaThread* current) { 1495 // Setup the list of module/path pairs for --patch-module processing 1496 // This must be done after the SymbolTable is created in order 1497 // to use fast_compare on module names instead of a string compare. 1498 if (Arguments::get_patch_mod_prefix() != nullptr) { 1499 setup_patch_mod_entries(); 1500 } 1501 1502 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries 1503 // to successfully determine if java.base has been patched) 1504 create_javabase(); 1505 1506 // Setup the initial java.base/path pair for the exploded build entries. 1507 // As more modules are defined during module system initialization, more 1508 // entries will be added to the exploded build array. 1509 if (!has_jrt_entry()) { 1510 assert(!CDSConfig::is_dumping_archive(), "not supported with exploded module builds"); 1511 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds"); 1512 // Set up the boot loader's _exploded_entries list. Note that this gets 1513 // done before loading any classes, by the same thread that will 1514 // subsequently do the first class load. So, no lock is needed for this. 1515 assert(_exploded_entries == nullptr, "Should only get initialized once"); 1516 _exploded_entries = new (mtModule) 1517 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, mtModule); 1518 add_to_exploded_build_list(current, vmSymbols::java_base()); 1519 } 1520 } 1521 1522 char* ClassLoader::get_canonical_path(const char* orig, Thread* thread) { 1523 assert(orig != nullptr, "bad arguments"); 1524 // caller needs to allocate ResourceMark for the following output buffer 1525 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN); 1526 ResourceMark rm(thread); 1527 // os::native_path writes into orig_copy 1528 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(orig)+1); 1529 strcpy(orig_copy, orig); 1530 if ((CanonicalizeEntry)(os::native_path(orig_copy), canonical_path, JVM_MAXPATHLEN) < 0) { 1531 return nullptr; 1532 } 1533 return canonical_path; 1534 } 1535 1536 void ClassLoader::create_javabase() { 1537 JavaThread* current = JavaThread::current(); 1538 1539 // Create java.base's module entry for the boot 1540 // class loader prior to loading j.l.Object. 1541 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 1542 1543 // Get module entry table 1544 ModuleEntryTable* null_cld_modules = null_cld->modules(); 1545 if (null_cld_modules == nullptr) { 1546 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader"); 1547 } 1548 1549 { 1550 MutexLocker ml(current, Module_lock); 1551 if (ModuleEntryTable::javabase_moduleEntry() == nullptr) { // may have been inited by CDS. 1552 ModuleEntry* jb_module = null_cld_modules->locked_create_entry(Handle(), 1553 false, vmSymbols::java_base(), nullptr, nullptr, null_cld); 1554 if (jb_module == nullptr) { 1555 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME); 1556 } 1557 ModuleEntryTable::set_javabase_moduleEntry(jb_module); 1558 } 1559 } 1560 } 1561 1562 // Please keep following two functions at end of this file. With them placed at top or in middle of the file, 1563 // they could get inlined by aggressive compiler, an unknown trick, see bug 6966589. 1564 void PerfClassTraceTime::initialize() { 1565 if (!UsePerfData) return; 1566 1567 if (_eventp != nullptr) { 1568 // increment the event counter 1569 _eventp->inc(); 1570 } 1571 1572 // stop the current active thread-local timer to measure inclusive time 1573 _prev_active_event = -1; 1574 for (int i=0; i < EVENT_TYPE_COUNT; i++) { 1575 if (_timers[i].is_active()) { 1576 assert(_prev_active_event == -1, "should have only one active timer"); 1577 _prev_active_event = i; 1578 _timers[i].stop(); 1579 } 1580 } 1581 1582 if (_recursion_counters == nullptr || (_recursion_counters[_event_type])++ == 0) { 1583 // start the inclusive timer if not recursively called 1584 _t.start(); 1585 } 1586 1587 // start thread-local timer of the given event type 1588 if (!_timers[_event_type].is_active()) { 1589 _timers[_event_type].start(); 1590 } 1591 } 1592 1593 PerfClassTraceTime::~PerfClassTraceTime() { 1594 if (!UsePerfData) return; 1595 1596 // stop the thread-local timer as the event completes 1597 // and resume the thread-local timer of the event next on the stack 1598 _timers[_event_type].stop(); 1599 jlong selftime = _timers[_event_type].ticks(); 1600 1601 if (_prev_active_event >= 0) { 1602 _timers[_prev_active_event].start(); 1603 } 1604 1605 if (_recursion_counters != nullptr && --(_recursion_counters[_event_type]) > 0) return; 1606 1607 // increment the counters only on the leaf call 1608 _t.stop(); 1609 _timep->inc(_t.ticks()); 1610 if (_selftimep != nullptr) { 1611 _selftimep->inc(selftime); 1612 } 1613 // add all class loading related event selftime to the accumulated time counter 1614 ClassLoader::perf_accumulated_time()->inc(selftime); 1615 1616 // reset the timer 1617 _timers[_event_type].reset(); 1618 }