1 /* 2 * Copyright (c) 1997, 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/aotClassLocation.hpp" 26 #include "cds/cds_globals.hpp" 27 #include "cds/cdsConfig.hpp" 28 #include "cds/dynamicArchive.hpp" 29 #include "cds/heapShared.hpp" 30 #include "classfile/classFileStream.hpp" 31 #include "classfile/classLoader.inline.hpp" 32 #include "classfile/classLoaderData.inline.hpp" 33 #include "classfile/classLoadInfo.hpp" 34 #include "classfile/javaClasses.hpp" 35 #include "classfile/klassFactory.hpp" 36 #include "classfile/moduleEntry.hpp" 37 #include "classfile/modules.hpp" 38 #include "classfile/packageEntry.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/timer.hpp" 73 #include "runtime/vm_version.hpp" 74 #include "services/management.hpp" 75 #include "services/threadService.hpp" 76 #include "utilities/checkedCast.hpp" 77 #include "utilities/classpathStream.hpp" 78 #include "utilities/events.hpp" 79 #include "utilities/macros.hpp" 80 #include "utilities/ostream.hpp" 81 #include "utilities/utf8.hpp" 82 83 #include <ctype.h> 84 #include <stdlib.h> 85 86 // Entry point in java.dll for path canonicalization 87 88 typedef int (*canonicalize_fn_t)(const char *orig, char *out, int len); 89 90 static canonicalize_fn_t CanonicalizeEntry = nullptr; 91 92 // Entry points for jimage.dll for loading jimage file entries 93 94 static JImageOpen_t JImageOpen = nullptr; 95 static JImageClose_t JImageClose = nullptr; 96 static JImageFindResource_t JImageFindResource = nullptr; 97 static JImageGetResource_t JImageGetResource = nullptr; 98 99 // JImageFile pointer, or null if exploded JDK build. 100 static JImageFile* JImage_file = nullptr; 101 102 // PreviewMode status to control preview behaviour. JImage_file is unusable 103 // for normal lookup until (Preview_mode != PREVIEW_MODE_UNINITIALIZED). 104 enum PreviewMode { 105 PREVIEW_MODE_UNINITIALIZED = 0, 106 PREVIEW_MODE_DEFAULT = 1, 107 PREVIEW_MODE_ENABLE_PREVIEW = 2 108 }; 109 static PreviewMode Preview_mode = PREVIEW_MODE_UNINITIALIZED; 110 111 // Globals 112 113 PerfCounter* ClassLoader::_perf_accumulated_time = nullptr; 114 PerfCounter* ClassLoader::_perf_classes_inited = nullptr; 115 PerfCounter* ClassLoader::_perf_class_init_time = nullptr; 116 PerfCounter* ClassLoader::_perf_class_init_selftime = nullptr; 117 PerfCounter* ClassLoader::_perf_classes_verified = nullptr; 118 PerfCounter* ClassLoader::_perf_class_verify_time = nullptr; 119 PerfCounter* ClassLoader::_perf_class_verify_selftime = nullptr; 120 PerfCounter* ClassLoader::_perf_classes_linked = nullptr; 121 PerfCounter* ClassLoader::_perf_class_link_time = nullptr; 122 PerfCounter* ClassLoader::_perf_class_link_selftime = nullptr; 123 PerfCounter* ClassLoader::_perf_shared_classload_time = nullptr; 124 PerfCounter* ClassLoader::_perf_sys_classload_time = nullptr; 125 PerfCounter* ClassLoader::_perf_app_classload_time = nullptr; 126 PerfCounter* ClassLoader::_perf_app_classload_selftime = nullptr; 127 PerfCounter* ClassLoader::_perf_app_classload_count = nullptr; 128 PerfCounter* ClassLoader::_perf_define_appclasses = nullptr; 129 PerfCounter* ClassLoader::_perf_define_appclass_time = nullptr; 130 PerfCounter* ClassLoader::_perf_define_appclass_selftime = nullptr; 131 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = nullptr; 132 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = nullptr; 133 PerfCounter* ClassLoader::_perf_ik_link_methods_time = nullptr; 134 PerfCounter* ClassLoader::_perf_method_adapters_time = nullptr; 135 PerfCounter* ClassLoader::_perf_ik_link_methods_count = nullptr; 136 PerfCounter* ClassLoader::_perf_method_adapters_count = nullptr; 137 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = nullptr; 138 PerfCounter* ClassLoader::_perf_secondary_hash_time = nullptr; 139 140 PerfCounter* ClassLoader::_perf_resolve_indy_time = nullptr; 141 PerfCounter* ClassLoader::_perf_resolve_invokehandle_time = nullptr; 142 PerfCounter* ClassLoader::_perf_resolve_mh_time = nullptr; 143 PerfCounter* ClassLoader::_perf_resolve_mt_time = nullptr; 144 145 PerfCounter* ClassLoader::_perf_resolve_indy_count = nullptr; 146 PerfCounter* ClassLoader::_perf_resolve_invokehandle_count = nullptr; 147 PerfCounter* ClassLoader::_perf_resolve_mh_count = nullptr; 148 PerfCounter* ClassLoader::_perf_resolve_mt_count = nullptr; 149 150 void ClassLoader::print_counters(outputStream *st) { 151 st->print_cr("ClassLoader:"); 152 st->print_cr(" clinit: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", ClassLoader::class_init_time_ms(), ClassLoader::class_init_count()); 153 st->print_cr(" link methods: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_ik_link_methods_time->get_value()) , _perf_ik_link_methods_count->get_value()); 154 st->print_cr(" method adapters: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_method_adapters_time->get_value()) , _perf_method_adapters_count->get_value()); 155 st->print_cr(" resolve..."); 156 st->print_cr(" invokedynamic: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_resolve_indy_time->get_value()) , _perf_resolve_indy_count->get_value()); 157 st->print_cr(" invokehandle: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_resolve_invokehandle_time->get_value()) , _perf_resolve_invokehandle_count->get_value()); 158 st->print_cr(" CP_MethodHandle: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_resolve_mh_time->get_value()) , _perf_resolve_mh_count->get_value()); 159 st->print_cr(" CP_MethodType: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_resolve_mt_time->get_value()) , _perf_resolve_mt_count->get_value()); 160 st->cr(); 161 } 162 163 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = nullptr; 164 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = nullptr; 165 ClassPathImageEntry* ClassLoader::_jrt_entry = nullptr; 166 167 ClassPathEntry* volatile ClassLoader::_first_append_entry_list = nullptr; 168 ClassPathEntry* volatile ClassLoader::_last_append_entry = nullptr; 169 170 // helper routines 171 #if INCLUDE_CDS 172 static bool string_starts_with(const char* str, const char* str_to_find) { 173 size_t str_len = strlen(str); 174 size_t str_to_find_len = strlen(str_to_find); 175 if (str_to_find_len > str_len) { 176 return false; 177 } 178 return (strncmp(str, str_to_find, str_to_find_len) == 0); 179 } 180 #endif 181 182 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) { 183 size_t str_len = strlen(str); 184 size_t str_to_find_len = strlen(str_to_find); 185 if (str_to_find_len > str_len) { 186 return false; 187 } 188 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0); 189 } 190 191 // Used to obtain the package name from a fully qualified class name. 192 Symbol* ClassLoader::package_from_class_name(const Symbol* name, bool* bad_class_name) { 193 if (name == nullptr) { 194 if (bad_class_name != nullptr) { 195 *bad_class_name = true; 196 } 197 return nullptr; 198 } 199 200 int utf_len = name->utf8_length(); 201 const jbyte* base = (const jbyte*)name->base(); 202 const jbyte* start = base; 203 const jbyte* end = UTF8::strrchr(start, utf_len, JVM_SIGNATURE_SLASH); 204 if (end == nullptr) { 205 return nullptr; 206 } 207 // Skip over '['s 208 if (*start == JVM_SIGNATURE_ARRAY) { 209 do { 210 start++; 211 } while (start < end && *start == JVM_SIGNATURE_ARRAY); 212 213 // Fully qualified class names should not contain a 'L'. 214 // Set bad_class_name to true to indicate that the package name 215 // could not be obtained due to an error condition. 216 // In this situation, is_same_class_package returns false. 217 if (*start == JVM_SIGNATURE_CLASS) { 218 if (bad_class_name != nullptr) { 219 *bad_class_name = true; 220 } 221 return nullptr; 222 } 223 } 224 // A class name could have just the slash character in the name, 225 // in which case start > end 226 if (start >= end) { 227 // No package name 228 if (bad_class_name != nullptr) { 229 *bad_class_name = true; 230 } 231 return nullptr; 232 } 233 return SymbolTable::new_symbol(name, pointer_delta_as_int(start, base), pointer_delta_as_int(end, base)); 234 } 235 236 // -------------------------------- 237 // The following jimage_xxx static functions encapsulate all JImage_file and Preview_mode access. 238 // This is done to make it easy to reason about the JImage file state (exists vs initialized etc.). 239 240 // Opens the named JImage file and sets the JImage file reference. 241 // Returns true if opening the JImage file was successful (see also jimage_exists()). 242 static bool jimage_open(const char* modules_path) { 243 // Currently 'error' is not set to anything useful, so ignore it here. 244 jint error; 245 JImage_file = (*JImageOpen)(modules_path, &error); 246 return JImage_file != nullptr; 247 } 248 249 // Closes and clears the JImage file reference (this will only be called during shutdown). 250 static void jimage_close() { 251 if (JImage_file != nullptr) { 252 (*JImageClose)(JImage_file); 253 JImage_file = nullptr; 254 } 255 } 256 257 // Returns whether a JImage file was opened (but NOT whether it was initialized yet). 258 static bool jimage_exists() { 259 return JImage_file != nullptr; 260 } 261 262 // Returns the JImage file reference (which may or may not be initialized). 263 static JImageFile* jimage_non_null() { 264 assert(jimage_exists(), "should have been opened by ClassLoader::lookup_vm_options " 265 "and remained throughout normal JVM lifetime"); 266 return JImage_file; 267 } 268 269 // Returns true if jimage_init() has been called. Once the JImage file is initialized, 270 // jimage_is_preview_enabled() can be called to correctly determine the access mode. 271 static bool jimage_is_initialized() { 272 return jimage_exists() && Preview_mode != PREVIEW_MODE_UNINITIALIZED; 273 } 274 275 // Returns the access mode for an initialized JImage file (reflects --enable-preview). 276 static bool is_preview_enabled() { 277 return Preview_mode == PREVIEW_MODE_ENABLE_PREVIEW; 278 } 279 280 // Looks up the location of a named JImage resource. This "raw" lookup function allows 281 // the preview mode to be manually specified, so must not be accessible outside this 282 // class. ClassPathImageEntry manages all calls for resources after startup is complete. 283 static JImageLocationRef jimage_find_resource(const char* module_name, 284 const char* file_name, 285 bool is_preview, 286 jlong *size) { 287 return ((*JImageFindResource)(jimage_non_null(), 288 module_name, 289 file_name, 290 is_preview, 291 size)); 292 } 293 // -------------------------------- 294 295 // Given a fully qualified package name, find its defining package in the class loader's 296 // package entry table. 297 PackageEntry* ClassLoader::get_package_entry(Symbol* pkg_name, ClassLoaderData* loader_data) { 298 if (pkg_name == nullptr) { 299 return nullptr; 300 } 301 PackageEntryTable* pkgEntryTable = loader_data->packages(); 302 return pkgEntryTable->lookup_only(pkg_name); 303 } 304 305 const char* ClassPathEntry::copy_path(const char* path) { 306 char* copy = NEW_C_HEAP_ARRAY(char, strlen(path)+1, mtClass); 307 strcpy(copy, path); 308 return copy; 309 } 310 311 ClassPathDirEntry::~ClassPathDirEntry() { 312 FREE_C_HEAP_ARRAY(char, _dir); 313 } 314 315 ClassFileStream* ClassPathDirEntry::open_stream(JavaThread* current, const char* name) { 316 // construct full path name 317 assert((_dir != nullptr) && (name != nullptr), "sanity"); 318 size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1; 319 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(current, char, path_len); 320 int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name); 321 assert(len == (int)(path_len - 1), "sanity"); 322 // check if file exists 323 struct stat st; 324 if (os::stat(path, &st) == 0) { 325 // found file, open it 326 int file_handle = os::open(path, 0, 0); 327 if (file_handle != -1) { 328 // read contents into resource array 329 u1* buffer = NEW_RESOURCE_ARRAY_IN_THREAD(current, u1, st.st_size); 330 size_t num_read = ::read(file_handle, (char*) buffer, st.st_size); 331 // close file 332 ::close(file_handle); 333 // construct ClassFileStream 334 if (num_read == (size_t)st.st_size) { 335 if (UsePerfData) { 336 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read); 337 } 338 #ifdef ASSERT 339 // Freeing path is a no-op here as buffer prevents it from being reclaimed. But we keep it for 340 // debug builds so that we guard against use-after-free bugs. 341 FREE_RESOURCE_ARRAY_IN_THREAD(current, char, path, path_len); 342 #endif 343 // We don't verify the length of the classfile stream fits in an int, but this is the 344 // bootloader so we have control of this. 345 // Resource allocated 346 return new ClassFileStream(buffer, 347 checked_cast<int>(st.st_size), 348 _dir); 349 } 350 } 351 } 352 FREE_RESOURCE_ARRAY_IN_THREAD(current, char, path, path_len); 353 return nullptr; 354 } 355 356 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() { 357 _zip = zip; 358 _zip_name = copy_path(zip_name); 359 } 360 361 ClassPathZipEntry::~ClassPathZipEntry() { 362 ZipLibrary::close(_zip); 363 FREE_C_HEAP_ARRAY(char, _zip_name); 364 } 365 366 bool ClassPathZipEntry::has_entry(JavaThread* current, const char* name) { 367 ThreadToNativeFromVM ttn(current); 368 // check whether zip archive contains name 369 jint name_len; 370 jint filesize; 371 jzentry* entry = ZipLibrary::find_entry(_zip, name, &filesize, &name_len); 372 if (entry == nullptr) { 373 return false; 374 } else { 375 ZipLibrary::free_entry(_zip, entry); 376 return true; 377 } 378 } 379 380 u1* ClassPathZipEntry::open_entry(JavaThread* current, const char* name, jint* filesize, bool nul_terminate) { 381 // enable call to C land 382 ThreadToNativeFromVM ttn(current); 383 // check whether zip archive contains name 384 jint name_len; 385 jzentry* entry = ZipLibrary::find_entry(_zip, name, filesize, &name_len); 386 if (entry == nullptr) return nullptr; 387 u1* buffer; 388 char name_buf[128]; 389 char* filename; 390 if (name_len < 128) { 391 filename = name_buf; 392 } else { 393 filename = NEW_RESOURCE_ARRAY(char, name_len + 1); 394 } 395 396 // read contents into resource array 397 size_t size = (uint32_t)(*filesize); 398 if (nul_terminate) { 399 if (sizeof(size) == sizeof(uint32_t) && size == UINT_MAX) { 400 return nullptr; // 32-bit integer overflow will occur. 401 } 402 size++; 403 } 404 buffer = NEW_RESOURCE_ARRAY(u1, size); 405 if (!ZipLibrary::read_entry(_zip, entry, buffer, filename)) { 406 return nullptr; 407 } 408 409 // return result 410 if (nul_terminate) { 411 buffer[size - 1] = 0; 412 } 413 return buffer; 414 } 415 416 ClassFileStream* ClassPathZipEntry::open_stream(JavaThread* current, const char* name) { 417 jint filesize; 418 u1* buffer = open_entry(current, name, &filesize, false); 419 if (buffer == nullptr) { 420 return nullptr; 421 } 422 if (UsePerfData) { 423 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize); 424 } 425 // Resource allocated 426 return new ClassFileStream(buffer, 427 filesize, 428 _zip_name); 429 } 430 431 DEBUG_ONLY(ClassPathImageEntry* ClassPathImageEntry::_singleton = nullptr;) 432 433 void ClassPathImageEntry::close_jimage() { 434 jimage_close(); 435 } 436 437 ClassPathImageEntry::ClassPathImageEntry(const char* name) : 438 ClassPathEntry() { 439 guarantee(jimage_is_initialized(), "jimage is not initialized"); 440 guarantee(name != nullptr, "jimage file name is null"); 441 442 assert(_singleton == nullptr, "VM supports only one jimage"); 443 DEBUG_ONLY(_singleton = this); 444 size_t len = strlen(name) + 1; 445 _name = copy_path(name); 446 } 447 448 ClassFileStream* ClassPathImageEntry::open_stream(JavaThread* current, const char* name) { 449 return open_stream_for_loader(current, name, ClassLoaderData::the_null_class_loader_data()); 450 } 451 452 // For a class in a named module, look it up in the jimage file using this syntax: 453 // /<module-name>/<package-name>/<base-class> 454 // 455 // Assumptions: 456 // 1. There are no unnamed modules in the jimage file. 457 // 2. A package is in at most one module in the jimage file. 458 // 459 ClassFileStream* ClassPathImageEntry::open_stream_for_loader(JavaThread* current, const char* name, ClassLoaderData* loader_data) { 460 const bool is_preview = is_preview_enabled(); 461 462 jlong size; 463 JImageLocationRef location = 0; 464 465 TempNewSymbol class_name = SymbolTable::new_symbol(name); 466 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name); 467 468 if (pkg_name != nullptr) { 469 if (!Universe::is_module_initialized()) { 470 location = jimage_find_resource(JAVA_BASE_NAME, name, is_preview, &size); 471 } else { 472 PackageEntry* package_entry = ClassLoader::get_package_entry(pkg_name, loader_data); 473 if (package_entry != nullptr) { 474 ResourceMark rm(current); 475 // Get the module name 476 ModuleEntry* module = package_entry->module(); 477 assert(module != nullptr, "Boot classLoader package missing module"); 478 assert(module->is_named(), "Boot classLoader package is in unnamed module"); 479 const char* module_name = module->name()->as_C_string(); 480 if (module_name != nullptr) { 481 location = jimage_find_resource(module_name, name, is_preview, &size); 482 } 483 } 484 } 485 } 486 487 if (location != 0) { 488 if (UsePerfData) { 489 ClassLoader::perf_sys_classfile_bytes_read()->inc(size); 490 } 491 char* data = NEW_RESOURCE_ARRAY(char, size); 492 (*JImageGetResource)(jimage_non_null(), location, data, size); 493 // Resource allocated 494 assert(this == ClassLoader::get_jrt_entry(), "must be"); 495 return new ClassFileStream((u1*)data, 496 checked_cast<int>(size), 497 _name, 498 true); // from_boot_loader_modules_image 499 } 500 501 return nullptr; 502 } 503 504 bool ClassPathImageEntry::is_modules_image() const { 505 assert(this == _singleton, "VM supports a single jimage"); 506 assert(this == ClassLoader::get_jrt_entry(), "must be used for jrt entry"); 507 return true; 508 } 509 510 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) { 511 _module_name = module_name; 512 _module_first_entry = nullptr; 513 _module_last_entry = nullptr; 514 } 515 516 ModuleClassPathList::~ModuleClassPathList() { 517 // Clean out each ClassPathEntry on list 518 ClassPathEntry* e = _module_first_entry; 519 while (e != nullptr) { 520 ClassPathEntry* next_entry = e->next(); 521 delete e; 522 e = next_entry; 523 } 524 } 525 526 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) { 527 if (new_entry != nullptr) { 528 if (_module_last_entry == nullptr) { 529 _module_first_entry = _module_last_entry = new_entry; 530 } else { 531 _module_last_entry->set_next(new_entry); 532 _module_last_entry = new_entry; 533 } 534 } 535 } 536 537 void ClassLoader::trace_class_path(const char* msg, const char* name) { 538 LogTarget(Info, class, path) lt; 539 if (lt.is_enabled()) { 540 LogStream ls(lt); 541 if (msg) { 542 ls.print("%s", msg); 543 } 544 if (name) { 545 if (strlen(name) < 256) { 546 ls.print("%s", name); 547 } else { 548 // For very long paths, we need to print each character separately, 549 // as print_cr() has a length limit 550 while (name[0] != '\0') { 551 ls.print("%c", name[0]); 552 name++; 553 } 554 } 555 } 556 ls.cr(); 557 } 558 } 559 560 void ClassLoader::setup_bootstrap_search_path(JavaThread* current) { 561 const char* bootcp = Arguments::get_boot_class_path(); 562 assert(bootcp != nullptr, "Boot class path must not be nullptr"); 563 if (PrintSharedArchiveAndExit) { 564 // Don't print bootcp - this is the bootcp of this current VM process, not necessarily 565 // the same as the boot classpath of the shared archive. 566 } else { 567 trace_class_path("bootstrap loader class path=", bootcp); 568 } 569 setup_bootstrap_search_path_impl(current, bootcp); 570 } 571 572 void ClassLoader::close_jrt_image() { 573 // Not applicable for exploded builds 574 if (!ClassLoader::has_jrt_entry()) return; 575 _jrt_entry->close_jimage(); 576 } 577 578 // Construct the array of module/path pairs as specified to --patch-module 579 // for the boot loader to search ahead of the jimage, if the class being 580 // loaded is defined to a module that has been specified to --patch-module. 581 void ClassLoader::setup_patch_mod_entries() { 582 JavaThread* current = JavaThread::current(); 583 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix(); 584 int num_of_entries = patch_mod_args->length(); 585 586 // Set up the boot loader's _patch_mod_entries list 587 _patch_mod_entries = new (mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, mtModule); 588 589 for (int i = 0; i < num_of_entries; i++) { 590 const char* module_name = (patch_mod_args->at(i))->module_name(); 591 Symbol* const module_sym = SymbolTable::new_symbol(module_name); 592 assert(module_sym != nullptr, "Failed to obtain Symbol for module name"); 593 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym); 594 595 char* class_path = (patch_mod_args->at(i))->path_string(); 596 ResourceMark rm(current); 597 ClasspathStream cp_stream(class_path); 598 599 while (cp_stream.has_next()) { 600 const char* path = cp_stream.get_next(); 601 struct stat st; 602 if (os::stat(path, &st) == 0) { 603 // File or directory found 604 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st); 605 // If the path specification is valid, enter it into this module's list 606 if (new_entry != nullptr) { 607 module_cpl->add_to_list(new_entry); 608 } 609 } 610 } 611 612 // Record the module into the list of --patch-module entries only if 613 // valid ClassPathEntrys have been created 614 if (module_cpl->module_first_entry() != nullptr) { 615 _patch_mod_entries->push(module_cpl); 616 } 617 } 618 } 619 620 // Determine whether the module has been patched via the command-line 621 // option --patch-module 622 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) { 623 if (_patch_mod_entries != nullptr && _patch_mod_entries->is_nonempty()) { 624 int table_len = _patch_mod_entries->length(); 625 for (int i = 0; i < table_len; i++) { 626 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i); 627 if (module_name->fast_compare(patch_mod->module_name()) == 0) { 628 return true; 629 } 630 } 631 } 632 return false; 633 } 634 635 // Set up the _jrt_entry if present and boot append path 636 void ClassLoader::setup_bootstrap_search_path_impl(JavaThread* current, const char *class_path) { 637 ResourceMark rm(current); 638 ClasspathStream cp_stream(class_path); 639 bool set_base_piece = true; 640 641 #if INCLUDE_CDS 642 if (CDSConfig::is_dumping_archive()) { 643 if (!Arguments::has_jimage()) { 644 vm_exit_during_initialization("CDS is not supported in exploded JDK build", nullptr); 645 } 646 } 647 #endif 648 649 while (cp_stream.has_next()) { 650 const char* path = cp_stream.get_next(); 651 652 if (set_base_piece) { 653 // The first time through the bootstrap_search setup, it must be determined 654 // what the base or core piece of the boot loader search is. Either a java runtime 655 // image is present or this is an exploded module build situation. 656 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME), 657 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build"); 658 struct stat st; 659 if (os::stat(path, &st) == 0) { 660 // Directory found 661 if (jimage_exists()) { 662 assert(Arguments::has_jimage(), "sanity check"); 663 const char* canonical_path = get_canonical_path(path, current); 664 assert(canonical_path != nullptr, "canonical_path issue"); 665 666 // Hand over lifecycle control of the JImage file to the _jrt_entry singleton 667 // (see ClassPathImageEntry::close_jimage). The image must be initialized by now. 668 _jrt_entry = new ClassPathImageEntry(canonical_path); 669 assert(_jrt_entry != nullptr && _jrt_entry->is_modules_image(), "No java runtime image present"); 670 } // else it's an exploded build. 671 } else { 672 // If path does not exist, exit 673 vm_exit_during_initialization("Unable to establish the boot loader search path", path); 674 } 675 set_base_piece = false; 676 } else { 677 // Every entry on the boot class path after the initial base piece, 678 // which is set by os::set_boot_path(), is considered an appended entry. 679 update_class_path_entry_list(current, path); 680 } 681 } 682 } 683 684 // Gets the exploded path for the named module. The memory for the path 685 // is allocated on the C heap if `c_heap` is true otherwise in the resource area. 686 static const char* get_exploded_module_path(const char* module_name, bool c_heap) { 687 const char *home = Arguments::get_java_home(); 688 const char file_sep = os::file_separator()[0]; 689 // 10 represents the length of "modules" (7) + 2 file separators + \0 690 size_t len = strlen(home) + strlen(module_name) + 10; 691 char *path = c_heap ? NEW_C_HEAP_ARRAY(char, len, mtModule) : NEW_RESOURCE_ARRAY(char, len); 692 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name); 693 return path; 694 } 695 696 // Gets a preview path for a given class path as a resource. 697 static const char* get_preview_path(const char* path) { 698 const char file_sep = os::file_separator()[0]; 699 // 18 represents the length of "META-INF" (8) + "preview" (7) + 2 file separators + \0 700 size_t len = strlen(path) + 18; 701 char *preview_path = NEW_RESOURCE_ARRAY(char, len); 702 jio_snprintf(preview_path, len, "%s%cMETA-INF%cpreview", path, file_sep, file_sep); 703 return preview_path; 704 } 705 706 // During an exploded modules build, each module defined to the boot loader 707 // will be added to the ClassLoader::_exploded_entries array. 708 void ClassLoader::add_to_exploded_build_list(JavaThread* current, Symbol* module_sym) { 709 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable"); 710 assert(_exploded_entries != nullptr, "_exploded_entries was not initialized"); 711 712 // Find the module's symbol 713 ResourceMark rm(current); 714 const char *module_name = module_sym->as_C_string(); 715 const char *path = get_exploded_module_path(module_name, false); 716 717 struct stat st; 718 if (os::stat(path, &st) == 0) { 719 // Directory found 720 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st); 721 // If the path specification is valid, enter it into this module's list. 722 // There is no need to check for duplicate modules in the exploded entry list, 723 // since no two modules with the same name can be defined to the boot loader. 724 // This is checked at module definition time in Modules::define_module. 725 if (new_entry != nullptr) { 726 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym); 727 log_info(class, load)("path: %s", path); 728 729 // If we are in preview mode, attempt to add a preview entry *before* the 730 // new class path entry if a preview path exists. 731 if (is_preview_enabled()) { 732 const char* preview_path = get_preview_path(path); 733 if (os::stat(preview_path, &st) == 0) { 734 ClassPathEntry* preview_entry = create_class_path_entry(current, preview_path, &st); 735 if (preview_entry != nullptr) { 736 module_cpl->add_to_list(preview_entry); 737 log_info(class, load)("preview path: %s", preview_path); 738 } 739 } 740 } 741 742 module_cpl->add_to_list(new_entry); 743 { 744 MutexLocker ml(current, Module_lock); 745 _exploded_entries->push(module_cpl); 746 } 747 } 748 } 749 } 750 751 jzfile* ClassLoader::open_zip_file(const char* canonical_path, char** error_msg, JavaThread* thread) { 752 // enable call to C land 753 ThreadToNativeFromVM ttn(thread); 754 HandleMark hm(thread); 755 return ZipLibrary::open(canonical_path, error_msg); 756 } 757 758 ClassPathEntry* ClassLoader::create_class_path_entry(JavaThread* current, 759 const char *path, const struct stat* st) { 760 ClassPathEntry* new_entry = nullptr; 761 if ((st->st_mode & S_IFMT) == S_IFREG) { 762 ResourceMark rm(current); 763 // Regular file, should be a zip file 764 // Canonicalized filename 765 const char* canonical_path = get_canonical_path(path, current); 766 if (canonical_path == nullptr) { 767 return nullptr; 768 } 769 char* error_msg = nullptr; 770 jzfile* zip = open_zip_file(canonical_path, &error_msg, current); 771 if (zip != nullptr && error_msg == nullptr) { 772 new_entry = new ClassPathZipEntry(zip, path); 773 } else { 774 return nullptr; 775 } 776 log_info(class, path)("opened: %s", path); 777 log_info(class, load)("opened: %s", path); 778 } else { 779 // Directory 780 new_entry = new ClassPathDirEntry(path); 781 log_info(class, load)("path: %s", path); 782 } 783 return new_entry; 784 } 785 786 787 // Create a class path zip entry for a given path (return null if not found 788 // or zip/JAR file cannot be opened) 789 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) { 790 // check for a regular file 791 struct stat st; 792 if (os::stat(path, &st) == 0) { 793 if ((st.st_mode & S_IFMT) == S_IFREG) { 794 JavaThread* thread = JavaThread::current(); 795 ResourceMark rm(thread); 796 const char* canonical_path = get_canonical_path(path, thread); 797 if (canonical_path != nullptr) { 798 char* error_msg = nullptr; 799 jzfile* zip = open_zip_file(canonical_path, &error_msg, thread); 800 if (zip != nullptr && error_msg == nullptr) { 801 // create using canonical path 802 return new ClassPathZipEntry(zip, canonical_path); 803 } 804 } 805 } 806 } 807 return nullptr; 808 } 809 810 // The boot append entries are added with a lock, and read lock free. 811 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) { 812 if (new_entry != nullptr) { 813 MutexLocker ml(Bootclasspath_lock, Mutex::_no_safepoint_check_flag); 814 if (_last_append_entry == nullptr) { 815 _last_append_entry = new_entry; 816 assert(first_append_entry() == nullptr, "boot loader's append class path entry list not empty"); 817 AtomicAccess::release_store(&_first_append_entry_list, new_entry); 818 } else { 819 _last_append_entry->set_next(new_entry); 820 _last_append_entry = new_entry; 821 } 822 } 823 } 824 825 // Returns true IFF the file/dir exists and the entry was successfully created. 826 bool ClassLoader::update_class_path_entry_list(JavaThread* current, const char *path) { 827 struct stat st; 828 if (os::stat(path, &st) == 0) { 829 // File or directory found 830 ClassPathEntry* new_entry = nullptr; 831 new_entry = create_class_path_entry(current, path, &st); 832 if (new_entry == nullptr) { 833 return false; 834 } 835 836 // Do not reorder the bootclasspath which would break get_system_package(). 837 // Add new entry to linked list 838 add_to_boot_append_entries(new_entry); 839 return true; 840 } else { 841 return false; 842 } 843 } 844 845 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) { 846 ResourceMark rm; 847 int num_of_entries = module_list->length(); 848 for (int i = 0; i < num_of_entries; i++) { 849 ClassPathEntry* e; 850 ModuleClassPathList* mpl = module_list->at(i); 851 tty->print("%s=", mpl->module_name()->as_C_string()); 852 e = mpl->module_first_entry(); 853 while (e != nullptr) { 854 tty->print("%s", e->name()); 855 e = e->next(); 856 if (e != nullptr) { 857 tty->print("%s", os::path_separator()); 858 } 859 } 860 tty->print(" ;"); 861 } 862 } 863 864 void ClassLoader::print_bootclasspath() { 865 ClassPathEntry* e; 866 tty->print("[bootclasspath= "); 867 868 // Print --patch-module module/path specifications first 869 if (_patch_mod_entries != nullptr) { 870 print_module_entry_table(_patch_mod_entries); 871 } 872 873 // [jimage | exploded modules build] 874 if (has_jrt_entry()) { 875 // Print the location of the java runtime image 876 tty->print("%s ;", _jrt_entry->name()); 877 } else { 878 // Print exploded module build path specifications 879 if (_exploded_entries != nullptr) { 880 print_module_entry_table(_exploded_entries); 881 } 882 } 883 884 // appended entries 885 e = first_append_entry(); 886 while (e != nullptr) { 887 tty->print("%s ;", e->name()); 888 e = e->next(); 889 } 890 tty->print_cr("]"); 891 } 892 893 void* ClassLoader::dll_lookup(void* lib, const char* name, const char* path) { 894 void* func = os::dll_lookup(lib, name); 895 if (func == nullptr) { 896 char msg[256] = ""; 897 jio_snprintf(msg, sizeof(msg), "Could not resolve \"%s\"", name); 898 vm_exit_during_initialization(msg, path); 899 } 900 return func; 901 } 902 903 void ClassLoader::load_java_library() { 904 assert(CanonicalizeEntry == nullptr, "should not load java library twice"); 905 if (is_vm_statically_linked()) { 906 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::lookup_function("JDK_Canonicalize")); 907 assert(CanonicalizeEntry != nullptr, "could not lookup JDK_Canonicalize"); 908 return; 909 } 910 911 void *javalib_handle = os::native_java_library(); 912 if (javalib_handle == nullptr) { 913 vm_exit_during_initialization("Unable to load java library", nullptr); 914 } 915 916 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, dll_lookup(javalib_handle, "JDK_Canonicalize", nullptr)); 917 assert(CanonicalizeEntry != nullptr, "could not lookup JDK_Canonicalize in java library"); 918 } 919 920 void ClassLoader::load_jimage_library() { 921 assert(JImageOpen == nullptr, "should not load jimage library twice"); 922 923 if (is_vm_statically_linked()) { 924 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::lookup_function("JIMAGE_Open")); 925 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::lookup_function("JIMAGE_Close")); 926 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::lookup_function("JIMAGE_FindResource")); 927 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::lookup_function("JIMAGE_GetResource")); 928 assert(JImageOpen != nullptr && JImageClose != nullptr && 929 JImageFindResource != nullptr && JImageGetResource != nullptr, 930 "could not lookup all jimage library functions"); 931 return; 932 } 933 934 char path[JVM_MAXPATHLEN]; 935 char ebuf[1024]; 936 void* handle = nullptr; 937 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) { 938 handle = os::dll_load(path, ebuf, sizeof ebuf); 939 } 940 if (handle == nullptr) { 941 vm_exit_during_initialization("Unable to load jimage library", path); 942 } 943 944 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, dll_lookup(handle, "JIMAGE_Open", path)); 945 JImageClose = CAST_TO_FN_PTR(JImageClose_t, dll_lookup(handle, "JIMAGE_Close", path)); 946 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, dll_lookup(handle, "JIMAGE_FindResource", path)); 947 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, dll_lookup(handle, "JIMAGE_GetResource", path)); 948 assert(JImageOpen != nullptr && JImageClose != nullptr && 949 JImageFindResource != nullptr && JImageGetResource != nullptr, 950 "could not lookup all jimage library functions in jimage library"); 951 } 952 953 int ClassLoader::crc32(int crc, const char* buf, int len) { 954 return ZipLibrary::crc32(crc, (const jbyte*)buf, len); 955 } 956 957 oop ClassLoader::get_system_package(const char* name, TRAPS) { 958 // Look up the name in the boot loader's package entry table. 959 if (name != nullptr) { 960 TempNewSymbol package_sym = SymbolTable::new_symbol(name); 961 // Look for the package entry in the boot loader's package entry table. 962 PackageEntry* package = 963 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym); 964 965 // Return null if package does not exist or if no classes in that package 966 // have been loaded. 967 if (package != nullptr && package->has_loaded_class()) { 968 ModuleEntry* module = package->module(); 969 if (module->location() != nullptr) { 970 ResourceMark rm(THREAD); 971 Handle ml = java_lang_String::create_from_str( 972 module->location()->as_C_string(), THREAD); 973 return ml(); 974 } 975 // Return entry on boot loader class path. 976 Handle cph = java_lang_String::create_from_str( 977 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD); 978 return cph(); 979 } 980 } 981 return nullptr; 982 } 983 984 objArrayOop ClassLoader::get_system_packages(TRAPS) { 985 ResourceMark rm(THREAD); 986 // List of pointers to PackageEntrys that have loaded classes. 987 PackageEntryTable* pe_table = 988 ClassLoaderData::the_null_class_loader_data()->packages(); 989 GrowableArray<PackageEntry*>* loaded_class_pkgs = pe_table->get_system_packages(); 990 991 // Allocate objArray and fill with java.lang.String 992 objArrayOop r = oopFactory::new_objArray(vmClasses::String_klass(), 993 loaded_class_pkgs->length(), CHECK_NULL); 994 objArrayHandle result(THREAD, r); 995 for (int x = 0; x < loaded_class_pkgs->length(); x++) { 996 PackageEntry* package_entry = loaded_class_pkgs->at(x); 997 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL); 998 result->obj_at_put(x, str()); 999 } 1000 return result(); 1001 } 1002 1003 // caller needs ResourceMark 1004 const char* ClassLoader::file_name_for_class_name(const char* class_name, 1005 int class_name_len) { 1006 assert(class_name != nullptr, "invariant"); 1007 assert((int)strlen(class_name) == class_name_len, "invariant"); 1008 1009 static const char class_suffix[] = ".class"; 1010 size_t class_suffix_len = sizeof(class_suffix); 1011 1012 char* const file_name = NEW_RESOURCE_ARRAY(char, 1013 class_name_len + 1014 class_suffix_len); // includes term null 1015 1016 strncpy(file_name, class_name, class_name_len); 1017 strncpy(&file_name[class_name_len], class_suffix, class_suffix_len); 1018 1019 return file_name; 1020 } 1021 1022 static ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry, 1023 const GrowableArray<ModuleClassPathList*>* const module_list) { 1024 int num_of_entries = module_list->length(); 1025 const Symbol* class_module_name = mod_entry->name(); 1026 1027 // Loop through all the modules in either the patch-module or exploded entries looking for module 1028 for (int i = 0; i < num_of_entries; i++) { 1029 ModuleClassPathList* module_cpl = module_list->at(i); 1030 Symbol* module_cpl_name = module_cpl->module_name(); 1031 1032 if (module_cpl_name->fast_compare(class_module_name) == 0) { 1033 // Class' module has been located. 1034 return module_cpl->module_first_entry(); 1035 } 1036 } 1037 return nullptr; 1038 } 1039 1040 1041 // Search the module list for the class file stream based on the file name and java package 1042 ClassFileStream* ClassLoader::search_module_entries(JavaThread* current, 1043 const GrowableArray<ModuleClassPathList*>* const module_list, 1044 PackageEntry* pkg_entry, // Java package entry derived from the class name 1045 const char* const file_name) { 1046 ClassFileStream* stream = nullptr; 1047 1048 // Find the defining module in the boot loader's module entry table 1049 ModuleEntry* mod_entry = (pkg_entry != nullptr) ? pkg_entry->module() : nullptr; 1050 1051 // If the module system has not defined java.base yet, then 1052 // classes loaded are assumed to be defined to java.base. 1053 // When java.base is eventually defined by the module system, 1054 // all packages of classes that have been previously loaded 1055 // are verified in ModuleEntryTable::verify_javabase_packages(). 1056 if (!Universe::is_module_initialized() && 1057 !ModuleEntryTable::javabase_defined() && 1058 mod_entry == nullptr) { 1059 mod_entry = ModuleEntryTable::javabase_moduleEntry(); 1060 } 1061 1062 // The module must be a named module 1063 ClassPathEntry* e = nullptr; 1064 if (mod_entry != nullptr && mod_entry->is_named()) { 1065 if (module_list == _exploded_entries) { 1066 // The exploded build entries can be added to at any time so a lock is 1067 // needed when searching them. 1068 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build"); 1069 MutexLocker ml(current, Module_lock); 1070 e = find_first_module_cpe(mod_entry, module_list); 1071 } else { 1072 e = find_first_module_cpe(mod_entry, module_list); 1073 } 1074 } 1075 1076 // Try to load the class from the module's ClassPathEntry list. 1077 while (e != nullptr) { 1078 stream = e->open_stream(current, file_name); 1079 // No context.check is required since CDS is not supported 1080 // for an exploded modules build or if --patch-module is specified. 1081 if (nullptr != stream) { 1082 return stream; 1083 } 1084 e = e->next(); 1085 } 1086 // If the module was located, break out even if the class was not 1087 // located successfully from that module's ClassPathEntry list. 1088 // There will not be another valid entry for that module. 1089 return nullptr; 1090 } 1091 1092 // Called by the boot classloader to load classes 1093 InstanceKlass* ClassLoader::load_class(Symbol* name, PackageEntry* pkg_entry, bool search_append_only, TRAPS) { 1094 assert(name != nullptr, "invariant"); 1095 1096 ResourceMark rm(THREAD); 1097 HandleMark hm(THREAD); 1098 1099 const char* const class_name = name->as_C_string(); 1100 1101 EventMarkClassLoading m("Loading class %s", class_name); 1102 1103 const char* const file_name = file_name_for_class_name(class_name, 1104 name->utf8_length()); 1105 assert(file_name != nullptr, "invariant"); 1106 1107 // Lookup stream for parsing .class file 1108 ClassFileStream* stream = nullptr; 1109 s2 classpath_index = 0; 1110 ClassPathEntry* e = nullptr; 1111 bool is_patched = false; 1112 1113 // If search_append_only is true, boot loader visibility boundaries are 1114 // set to be _first_append_entry to the end. This includes: 1115 // [-Xbootclasspath/a]; [jvmti appended entries] 1116 // 1117 // If search_append_only is false, boot loader visibility boundaries are 1118 // set to be the --patch-module entries plus the base piece. This includes: 1119 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build] 1120 // 1121 1122 // Load Attempt #1: --patch-module 1123 // Determine the class' defining module. If it appears in the _patch_mod_entries, 1124 // attempt to load the class from those locations specific to the module. 1125 // Specifications to --patch-module can contain a partial number of classes 1126 // that are part of the overall module definition. So if a particular class is not 1127 // found within its module specification, the search should continue to Load Attempt #2. 1128 // Note: The --patch-module entries are never searched if the boot loader's 1129 // visibility boundary is limited to only searching the append entries. 1130 if (_patch_mod_entries != nullptr && !search_append_only) { 1131 // At CDS dump time, the --patch-module entries are ignored. That means a 1132 // class is still loaded from the runtime image even if it might 1133 // appear in the _patch_mod_entries. The runtime shared class visibility 1134 // check will determine if a shared class is visible based on the runtime 1135 // environment, including the runtime --patch-module setting. 1136 if (!Arguments::is_valhalla_enabled()) { 1137 // Dynamic dumping requires UseSharedSpaces to be enabled. Since --patch-module 1138 // is not supported with UseSharedSpaces, we can never come here during dynamic dumping. 1139 assert(!CDSConfig::is_dumping_archive(), "CDS doesn't support --patch-module during dumping"); 1140 } 1141 if (Arguments::is_valhalla_enabled() || !CDSConfig::is_dumping_static_archive()) { 1142 stream = search_module_entries(THREAD, _patch_mod_entries, pkg_entry, file_name); 1143 if (stream != nullptr) { 1144 is_patched = true; 1145 } 1146 } 1147 } 1148 1149 // Load Attempt #2: [jimage | exploded build] 1150 if (!search_append_only && (nullptr == stream)) { 1151 if (has_jrt_entry()) { 1152 e = _jrt_entry; 1153 stream = _jrt_entry->open_stream(THREAD, file_name); 1154 } else { 1155 // Exploded build - attempt to locate class in its defining module's location. 1156 assert(_exploded_entries != nullptr, "No exploded build entries present"); 1157 assert(!CDSConfig::is_dumping_archive(), "CDS dumping doesn't support exploded build"); 1158 stream = search_module_entries(THREAD, _exploded_entries, pkg_entry, file_name); 1159 } 1160 } 1161 1162 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries] 1163 if (search_append_only && (nullptr == stream)) { 1164 // For the boot loader append path search, the starting classpath_index 1165 // for the appended piece is always 1 to account for either the 1166 // _jrt_entry or the _exploded_entries. 1167 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly"); 1168 classpath_index = 1; 1169 1170 e = first_append_entry(); 1171 while (e != nullptr) { 1172 stream = e->open_stream(THREAD, file_name); 1173 if (nullptr != stream) { 1174 break; 1175 } 1176 e = e->next(); 1177 ++classpath_index; 1178 } 1179 } 1180 1181 if (nullptr == stream) { 1182 return nullptr; 1183 } 1184 1185 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 1186 Handle protection_domain; 1187 ClassLoadInfo cl_info(protection_domain); 1188 1189 InstanceKlass* result = KlassFactory::create_from_stream(stream, 1190 name, 1191 loader_data, 1192 cl_info, 1193 CHECK_NULL); 1194 result->set_classpath_index(classpath_index); 1195 if (is_patched) { 1196 result->set_shared_classpath_index(0); 1197 } 1198 return result; 1199 } 1200 1201 #if INCLUDE_CDS 1202 static const char* skip_uri_protocol(const char* source) { 1203 if (strncmp(source, "file:", 5) == 0) { 1204 // file: protocol path could start with file:/ or file:/// 1205 // locate the char after all the forward slashes 1206 int offset = 5; 1207 while (*(source + offset) == '/') { 1208 offset++; 1209 } 1210 source += offset; 1211 // for non-windows platforms, move back one char as the path begins with a '/' 1212 #ifndef _WINDOWS 1213 source -= 1; 1214 #endif 1215 } else if (strncmp(source, "jrt:/", 5) == 0) { 1216 source += 5; 1217 } 1218 return source; 1219 } 1220 1221 static char decode_percent_encoded(const char *str, size_t& index) { 1222 if (str[index] == '%' 1223 && isxdigit(str[index + 1]) 1224 && isxdigit(str[index + 2])) { 1225 char hex[3]; 1226 hex[0] = str[index + 1]; 1227 hex[1] = str[index + 2]; 1228 hex[2] = '\0'; 1229 index += 2; 1230 return (char) strtol(hex, nullptr, 16); 1231 } 1232 return str[index]; 1233 } 1234 1235 char* ClassLoader::uri_to_path(const char* uri) { 1236 const size_t len = strlen(uri) + 1; 1237 char* path = NEW_RESOURCE_ARRAY(char, len); 1238 1239 uri = skip_uri_protocol(uri); 1240 1241 if (strncmp(uri, "//", 2) == 0) { 1242 // Skip the empty "authority" part 1243 uri += 2; 1244 } 1245 1246 #ifdef _WINDOWS 1247 if (uri[0] == '/') { 1248 // Absolute path name on Windows does not begin with a slash 1249 uri += 1; 1250 } 1251 #endif 1252 1253 size_t path_index = 0; 1254 for (size_t i = 0; i < strlen(uri); ++i) { 1255 char decoded = decode_percent_encoded(uri, i); 1256 path[path_index++] = decoded; 1257 } 1258 path[path_index] = '\0'; 1259 return path; 1260 } 1261 1262 // Record the shared classpath index and loader type for classes loaded 1263 // by the builtin loaders at dump time. 1264 void ClassLoader::record_result(JavaThread* current, InstanceKlass* ik, 1265 const ClassFileStream* stream, bool redefined) { 1266 assert(CDSConfig::is_dumping_archive(), "sanity"); 1267 assert(stream != nullptr, "sanity"); 1268 1269 if (ik->is_hidden()) { 1270 record_hidden_class(ik); 1271 return; 1272 } 1273 1274 if (ik->shared_classpath_index() == 0 && ik->defined_by_boot_loader()) { 1275 return; 1276 } 1277 1278 oop loader = ik->class_loader(); 1279 char* src = (char*)stream->source(); 1280 if (src == nullptr) { 1281 ik->set_shared_classpath_index(-1); // unsupported location 1282 return; 1283 } 1284 1285 if (!SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) { 1286 // A class loaded by a user-defined classloader. 1287 assert(ik->shared_classpath_index() < 0, "not assigned yet"); 1288 ik->set_shared_classpath_index(UNREGISTERED_INDEX); 1289 SystemDictionaryShared::set_shared_class_misc_info(ik, (ClassFileStream*)stream); 1290 return; 1291 } 1292 1293 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build"); 1294 1295 ResourceMark rm(current); 1296 int classpath_index = -1; 1297 bool found_invalid = false; 1298 1299 PackageEntry* pkg_entry = ik->package(); 1300 1301 if (!AOTClassLocationConfig::dumptime_is_ready()) { 1302 // The shared path table is set up after module system initialization. 1303 // The path table contains no entry before that. Any classes loaded prior 1304 // to the setup of the shared path table must be from the modules image. 1305 assert(stream->from_boot_loader_modules_image(), "stream must be loaded by boot loader from modules image"); 1306 classpath_index = 0; 1307 } else { 1308 // Save the path from the file: protocol or the module name from the jrt: protocol 1309 // if no protocol prefix is found, path is the same as stream->source(). This path 1310 // must be valid since the class has been successfully parsed. 1311 const char* path = ClassLoader::uri_to_path(src); 1312 assert(path != nullptr, "sanity"); 1313 AOTClassLocationConfig::dumptime_iterate([&] (AOTClassLocation* cl) { 1314 int i = cl->index(); 1315 // for index 0 and the stream->source() is the modules image or has the jrt: protocol. 1316 // The class must be from the runtime modules image. 1317 if (cl->is_modules_image() && (stream->from_boot_loader_modules_image() || string_starts_with(src, "jrt:"))) { 1318 classpath_index = i; 1319 } else if (os::same_files(cl->path(), path)) { 1320 // If the path (from the class stream source) is the same as the shared 1321 // class or module path, then we have a match. 1322 // src may come from the App/Platform class loaders, which would canonicalize 1323 // the file name. We cannot use strcmp to check for equality against cs->path(). 1324 // We must use os::same_files (which is faster than canonicalizing cs->path()). 1325 1326 // null pkg_entry and pkg_entry in an unnamed module implies the class 1327 // is from the -cp or boot loader append path which consists of -Xbootclasspath/a 1328 // and jvmti appended entries. 1329 if ((pkg_entry == nullptr) || (pkg_entry->in_unnamed_module())) { 1330 // Ensure the index is within the -cp range before assigning 1331 // to the classpath_index. 1332 if (SystemDictionary::is_system_class_loader(loader) && cl->from_app_classpath()) { 1333 classpath_index = i; 1334 } else { 1335 if (cl->from_boot_classpath()) { 1336 if (loader != nullptr) { 1337 // Probably loaded by jdk/internal/loader/ClassLoaders$BootClassLoader. Don't archive 1338 // such classes. 1339 found_invalid = true; 1340 } else { 1341 classpath_index = i; 1342 } 1343 } 1344 } 1345 } else { 1346 // A class from a named module from the --module-path. Ensure the index is 1347 // within the --module-path range before assigning to the classpath_index. 1348 if ((pkg_entry != nullptr) && !(pkg_entry->in_unnamed_module()) && cl->from_module_path()) { 1349 classpath_index = i; 1350 } 1351 } 1352 } 1353 if (classpath_index >= 0 || found_invalid) { 1354 return false; // Break the AOTClassLocationConfig::dumptime_iterate() loop. 1355 } else { 1356 return true; // Keep iterating 1357 } 1358 }); 1359 } 1360 1361 if (found_invalid) { 1362 assert(classpath_index == -1, "sanity"); 1363 } 1364 1365 const char* const class_name = ik->name()->as_C_string(); 1366 const char* const file_name = file_name_for_class_name(class_name, 1367 ik->name()->utf8_length()); 1368 assert(file_name != nullptr, "invariant"); 1369 record_result_for_builtin_loader(checked_cast<s2>(classpath_index), ik, redefined); 1370 } 1371 1372 void ClassLoader::record_result_for_builtin_loader(s2 classpath_index, InstanceKlass* result, bool redefined) { 1373 assert(CDSConfig::is_dumping_archive(), "sanity"); 1374 1375 oop loader = result->class_loader(); 1376 if (SystemDictionary::is_system_class_loader(loader)) { 1377 AOTClassLocationConfig::dumptime_set_has_app_classes(); 1378 } else if (SystemDictionary::is_platform_class_loader(loader)) { 1379 AOTClassLocationConfig::dumptime_set_has_platform_classes(); 1380 } else { 1381 precond(loader == nullptr); 1382 } 1383 1384 if (CDSConfig::is_dumping_preimage_static_archive() || CDSConfig::is_dumping_dynamic_archive()) { 1385 if (!AOTClassLocationConfig::dumptime()->is_valid_classpath_index(classpath_index, result)) { 1386 classpath_index = -1; 1387 } 1388 } 1389 1390 AOTClassLocationConfig::dumptime_update_max_used_index(classpath_index); 1391 result->set_shared_classpath_index(classpath_index); 1392 } 1393 1394 void ClassLoader::record_hidden_class(InstanceKlass* ik) { 1395 assert(ik->is_hidden(), "must be"); 1396 1397 if (ik->defined_by_other_loaders()) { 1398 // We don't archive hidden classes for non-builtin loaders. 1399 return; 1400 } 1401 1402 if (HeapShared::is_lambda_proxy_klass(ik)) { 1403 InstanceKlass* nest_host = ik->nest_host_not_null(); 1404 ik->set_shared_classpath_index(nest_host->shared_classpath_index()); 1405 } else if (HeapShared::is_lambda_form_klass(ik)) { 1406 ik->set_shared_classpath_index(0); 1407 } else { 1408 // Generated invoker classes. 1409 if (ik->defined_by_app_loader()) { 1410 ik->set_shared_classpath_index(AOTClassLocationConfig::dumptime()->app_cp_start_index()); 1411 } else { 1412 ik->set_shared_classpath_index(0); 1413 } 1414 } 1415 } 1416 1417 void ClassLoader::append_boot_classpath(ClassPathEntry* new_entry) { 1418 if (CDSConfig::is_using_archive()) { 1419 warning("Sharing is only supported for boot loader classes because bootstrap classpath has been appended"); 1420 FileMapInfo::current_info()->set_has_platform_or_app_classes(false); 1421 if (DynamicArchive::is_mapped()) { 1422 FileMapInfo::dynamic_info()->set_has_platform_or_app_classes(false); 1423 } 1424 } 1425 add_to_boot_append_entries(new_entry); 1426 } 1427 #endif // INCLUDE_CDS 1428 1429 // Initialize the class loader's access to methods in libzip. Parse and 1430 // process the boot classpath into a list ClassPathEntry objects. Once 1431 // this list has been created, it must not change order (see class PackageInfo) 1432 // it can be appended to and is by jvmti. 1433 1434 void ClassLoader::initialize(TRAPS) { 1435 if (UsePerfData) { 1436 // jvmstat performance counters 1437 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time"); 1438 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime"); 1439 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self"); 1440 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime"); 1441 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self"); 1442 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime"); 1443 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self"); 1444 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses"); 1445 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses"); 1446 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses"); 1447 1448 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime"); 1449 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime"); 1450 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime"); 1451 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self"); 1452 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount"); 1453 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses"); 1454 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime"); 1455 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self"); 1456 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes"); 1457 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes"); 1458 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, "unsafeDefineClassCalls"); 1459 NEWPERFTICKCOUNTER(_perf_secondary_hash_time, SUN_CLS, "secondarySuperHashTime"); 1460 1461 if (log_is_enabled(Info, perf, class, link)) { 1462 NEWPERFTICKCOUNTER(_perf_ik_link_methods_time, SUN_CLS, "linkMethodsTime"); 1463 NEWPERFTICKCOUNTER(_perf_method_adapters_time, SUN_CLS, "makeAdaptersTime"); 1464 NEWPERFEVENTCOUNTER(_perf_ik_link_methods_count, SUN_CLS, "linkMethodsCount"); 1465 NEWPERFEVENTCOUNTER(_perf_method_adapters_count, SUN_CLS, "makeAdaptersCount"); 1466 1467 NEWPERFTICKCOUNTER(_perf_resolve_indy_time, SUN_CLS, "resolve_invokedynamic_time"); 1468 NEWPERFTICKCOUNTER(_perf_resolve_invokehandle_time, SUN_CLS, "resolve_invokehandle_time"); 1469 NEWPERFTICKCOUNTER(_perf_resolve_mh_time, SUN_CLS, "resolve_MethodHandle_time"); 1470 NEWPERFTICKCOUNTER(_perf_resolve_mt_time, SUN_CLS, "resolve_MethodType_time"); 1471 1472 NEWPERFEVENTCOUNTER(_perf_resolve_indy_count, SUN_CLS, "resolve_invokedynamic_count"); 1473 NEWPERFEVENTCOUNTER(_perf_resolve_invokehandle_count, SUN_CLS, "resolve_invokehandle_count"); 1474 NEWPERFEVENTCOUNTER(_perf_resolve_mh_count, SUN_CLS, "resolve_MethodHandle_count"); 1475 NEWPERFEVENTCOUNTER(_perf_resolve_mt_count, SUN_CLS, "resolve_MethodType_count"); 1476 } 1477 } 1478 1479 // lookup java library entry points 1480 load_java_library(); 1481 // jimage library entry points are loaded below, in lookup_vm_options 1482 setup_bootstrap_search_path(THREAD); 1483 } 1484 1485 // Lookup VM options embedded in the modules jimage file 1486 char* ClassLoader::lookup_vm_options() { 1487 char modules_path[JVM_MAXPATHLEN]; 1488 const char* fileSep = os::file_separator(); 1489 1490 // Initialize jimage library entry points 1491 load_jimage_library(); 1492 1493 jio_snprintf(modules_path, JVM_MAXPATHLEN, "%s%slib%smodules", Arguments::get_java_home(), fileSep, fileSep); 1494 if (jimage_open(modules_path)) { 1495 // Special case where we lookup the options string *before* set_preview_mode() is called. 1496 // Since VM arguments have not been parsed, and the ClassPathImageEntry singleton 1497 // has not been created yet, we access the JImage file directly in non-preview mode. 1498 jlong size; 1499 JImageLocationRef location = 1500 jimage_find_resource(JAVA_BASE_NAME, "jdk/internal/vm/options", /* is_preview */ false, &size); 1501 if (location != 0) { 1502 char *options = NEW_C_HEAP_ARRAY(char, size+1, mtClass); 1503 (*JImageGetResource)(jimage_non_null(), location, options, size); 1504 options[size] = '\0'; 1505 return options; 1506 } 1507 } 1508 return nullptr; 1509 } 1510 1511 // Finishes initializing the JImageFile (if present) by setting the access mode. 1512 void ClassLoader::set_preview_mode(bool enable_preview) { 1513 assert(Preview_mode == PREVIEW_MODE_UNINITIALIZED, "set_preview_mode must not be called twice"); 1514 Preview_mode = enable_preview ? PREVIEW_MODE_ENABLE_PREVIEW : PREVIEW_MODE_DEFAULT; 1515 } 1516 1517 bool ClassLoader::is_module_observable(const char* module_name) { 1518 assert(JImageOpen != nullptr, "jimage library should have been opened"); 1519 if (!jimage_exists()) { 1520 struct stat st; 1521 const char *path = get_exploded_module_path(module_name, true); 1522 bool res = os::stat(path, &st) == 0; 1523 FREE_C_HEAP_ARRAY(char, path); 1524 return res; 1525 } 1526 // We don't expect preview mode (i.e. --enable-preview) to affect module visibility. 1527 jlong size; 1528 return jimage_find_resource(module_name, "module-info.class", /* is_preview */ false, &size) != 0; 1529 } 1530 1531 jlong ClassLoader::classloader_time_ms() { 1532 return UsePerfData ? 1533 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1; 1534 } 1535 1536 jlong ClassLoader::class_init_count() { 1537 return UsePerfData ? _perf_classes_inited->get_value() : -1; 1538 } 1539 1540 jlong ClassLoader::class_init_time_ms() { 1541 return UsePerfData ? 1542 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1; 1543 } 1544 1545 jlong ClassLoader::class_verify_time_ms() { 1546 return UsePerfData ? 1547 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1; 1548 } 1549 1550 jlong ClassLoader::class_link_count() { 1551 return UsePerfData ? _perf_classes_linked->get_value() : -1; 1552 } 1553 1554 jlong ClassLoader::class_link_time_ms() { 1555 return UsePerfData ? 1556 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1; 1557 } 1558 1559 int ClassLoader::compute_Object_vtable() { 1560 // hardwired for JDK1.2 -- would need to duplicate class file parsing 1561 // code to determine actual value from file 1562 // Would be value '11' if finals were in vtable 1563 int JDK_1_2_Object_vtable_size = 5; 1564 return JDK_1_2_Object_vtable_size * vtableEntry::size(); 1565 } 1566 1567 1568 void classLoader_init1() { 1569 EXCEPTION_MARK; 1570 ClassLoader::initialize(THREAD); 1571 if (HAS_PENDING_EXCEPTION) { 1572 vm_exit_during_initialization("ClassLoader::initialize() failed unexpectedly"); 1573 } 1574 } 1575 1576 // Complete the ClassPathEntry setup for the boot loader 1577 void ClassLoader::classLoader_init2(JavaThread* current) { 1578 // Setup the list of module/path pairs for --patch-module processing 1579 // This must be done after the SymbolTable is created in order 1580 // to use fast_compare on module names instead of a string compare. 1581 if (Arguments::get_patch_mod_prefix() != nullptr) { 1582 setup_patch_mod_entries(); 1583 } 1584 1585 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries 1586 // to successfully determine if java.base has been patched) 1587 create_javabase(); 1588 1589 // Setup the initial java.base/path pair for the exploded build entries. 1590 // As more modules are defined during module system initialization, more 1591 // entries will be added to the exploded build array. 1592 if (!has_jrt_entry()) { 1593 assert(!CDSConfig::is_dumping_archive(), "not supported with exploded module builds"); 1594 assert(!CDSConfig::is_using_archive(), "UsedSharedSpaces not supported with exploded module builds"); 1595 // Set up the boot loader's _exploded_entries list. Note that this gets 1596 // done before loading any classes, by the same thread that will 1597 // subsequently do the first class load. So, no lock is needed for this. 1598 assert(_exploded_entries == nullptr, "Should only get initialized once"); 1599 _exploded_entries = new (mtModule) 1600 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, mtModule); 1601 add_to_exploded_build_list(current, vmSymbols::java_base()); 1602 } 1603 } 1604 1605 char* ClassLoader::get_canonical_path(const char* orig, Thread* thread) { 1606 assert(orig != nullptr, "bad arguments"); 1607 // caller needs to allocate ResourceMark for the following output buffer 1608 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN); 1609 ResourceMark rm(thread); 1610 // os::native_path writes into orig_copy 1611 char* orig_copy = ResourceArea::strdup(thread, orig); 1612 if ((CanonicalizeEntry)(os::native_path(orig_copy), canonical_path, JVM_MAXPATHLEN) < 0) { 1613 return nullptr; 1614 } 1615 return canonical_path; 1616 } 1617 1618 void ClassLoader::create_javabase() { 1619 JavaThread* current = JavaThread::current(); 1620 1621 // Create java.base's module entry for the boot 1622 // class loader prior to loading j.l.Object. 1623 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 1624 1625 // Get module entry table 1626 ModuleEntryTable* null_cld_modules = null_cld->modules(); 1627 if (null_cld_modules == nullptr) { 1628 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader"); 1629 } 1630 1631 { 1632 MutexLocker ml(current, Module_lock); 1633 if (ModuleEntryTable::javabase_moduleEntry() == nullptr) { // may have been inited by CDS. 1634 ModuleEntry* jb_module = null_cld_modules->locked_create_entry(Handle(), 1635 false, vmSymbols::java_base(), nullptr, nullptr, null_cld); 1636 if (jb_module == nullptr) { 1637 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME); 1638 } 1639 ModuleEntryTable::set_javabase_moduleEntry(jb_module); 1640 } 1641 } 1642 } 1643 1644 // Please keep following two functions at end of this file. With them placed at top or in middle of the file, 1645 // they could get inlined by aggressive compiler, an unknown trick, see bug 6966589. 1646 void PerfClassTraceTime::initialize() { 1647 if (!UsePerfData) return; 1648 1649 if (_eventp != nullptr) { 1650 // increment the event counter 1651 _eventp->inc(); 1652 } 1653 1654 // stop the current active thread-local timer to measure inclusive time 1655 _prev_active_event = -1; 1656 for (int i=0; i < EVENT_TYPE_COUNT; i++) { 1657 if (_timers[i].is_active()) { 1658 assert(_prev_active_event == -1, "should have only one active timer"); 1659 _prev_active_event = i; 1660 _timers[i].stop(); 1661 } 1662 } 1663 1664 if (_recursion_counters == nullptr || (_recursion_counters[_event_type])++ == 0) { 1665 // start the inclusive timer if not recursively called 1666 _t.start(); 1667 } 1668 1669 // start thread-local timer of the given event type 1670 if (!_timers[_event_type].is_active()) { 1671 _timers[_event_type].start(); 1672 } 1673 } 1674 1675 PerfClassTraceTime::~PerfClassTraceTime() { 1676 if (!UsePerfData) return; 1677 1678 // stop the thread-local timer as the event completes 1679 // and resume the thread-local timer of the event next on the stack 1680 _timers[_event_type].stop(); 1681 jlong selftime = _timers[_event_type].ticks(); 1682 1683 if (_prev_active_event >= 0) { 1684 _timers[_prev_active_event].start(); 1685 } 1686 1687 if (_recursion_counters != nullptr && --(_recursion_counters[_event_type]) > 0) return; 1688 1689 // increment the counters only on the leaf call 1690 _t.stop(); 1691 _timep->inc(_t.ticks()); 1692 if (_selftimep != nullptr) { 1693 _selftimep->inc(selftime); 1694 } 1695 // add all class loading related event selftime to the accumulated time counter 1696 ClassLoader::perf_accumulated_time()->inc(selftime); 1697 1698 // reset the timer 1699 _timers[_event_type].reset(); 1700 } --- EOF ---