1 /* 2 * Copyright (c) 1997, 2026, 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 "cppstdlib/cstdlib.hpp" 46 #include "interpreter/bytecodeStream.hpp" 47 #include "interpreter/oopMapCache.hpp" 48 #include "jimage.hpp" 49 #include "jvm.h" 50 #include "logging/log.hpp" 51 #include "logging/logStream.hpp" 52 #include "logging/logTag.hpp" 53 #include "memory/allocation.inline.hpp" 54 #include "memory/oopFactory.hpp" 55 #include "memory/resourceArea.hpp" 56 #include "memory/universe.hpp" 57 #include "oops/instanceKlass.hpp" 58 #include "oops/instanceRefKlass.hpp" 59 #include "oops/klass.inline.hpp" 60 #include "oops/method.inline.hpp" 61 #include "oops/objArrayOop.inline.hpp" 62 #include "oops/oop.inline.hpp" 63 #include "oops/symbol.hpp" 64 #include "prims/jvm_misc.hpp" 65 #include "runtime/arguments.hpp" 66 #include "runtime/handles.inline.hpp" 67 #include "runtime/init.hpp" 68 #include "runtime/interfaceSupport.inline.hpp" 69 #include "runtime/java.hpp" 70 #include "runtime/javaCalls.hpp" 71 #include "runtime/os.hpp" 72 #include "runtime/perfData.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/ostream.hpp" 82 #include "utilities/utf8.hpp" 83 84 #include <ctype.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 PerfCounter* ClassLoader::_perf_change_wx_time = nullptr; 140 141 PerfCounter* ClassLoader::_perf_resolve_indy_time = nullptr; 142 PerfCounter* ClassLoader::_perf_resolve_invokehandle_time = nullptr; 143 PerfCounter* ClassLoader::_perf_resolve_mh_time = nullptr; 144 PerfCounter* ClassLoader::_perf_resolve_mt_time = nullptr; 145 146 PerfCounter* ClassLoader::_perf_resolve_indy_count = nullptr; 147 PerfCounter* ClassLoader::_perf_resolve_invokehandle_count = nullptr; 148 PerfCounter* ClassLoader::_perf_resolve_mh_count = nullptr; 149 PerfCounter* ClassLoader::_perf_resolve_mt_count = nullptr; 150 151 void ClassLoader::print_counters(outputStream *st) { 152 st->print_cr("ClassLoader:"); 153 st->print_cr(" clinit: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", ClassLoader::class_init_time_ms(), ClassLoader::class_init_count()); 154 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()); 155 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()); 156 st->print_cr(" resolve..."); 157 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()); 158 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()); 159 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()); 160 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()); 161 st->cr(); 162 } 163 164 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = nullptr; 165 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = nullptr; 166 ClassPathImageEntry* ClassLoader::_jrt_entry = nullptr; 167 168 ClassPathEntry* volatile ClassLoader::_first_append_entry_list = nullptr; 169 ClassPathEntry* volatile ClassLoader::_last_append_entry = nullptr; 170 171 // helper routines 172 #if INCLUDE_CDS 173 static bool string_starts_with(const char* str, const char* str_to_find) { 174 size_t str_len = strlen(str); 175 size_t str_to_find_len = strlen(str_to_find); 176 if (str_to_find_len > str_len) { 177 return false; 178 } 179 return (strncmp(str, str_to_find, str_to_find_len) == 0); 180 } 181 #endif 182 183 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) { 184 size_t str_len = strlen(str); 185 size_t str_to_find_len = strlen(str_to_find); 186 if (str_to_find_len > str_len) { 187 return false; 188 } 189 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0); 190 } 191 192 // Used to obtain the package name from a fully qualified class name. 193 Symbol* ClassLoader::package_from_class_name(const Symbol* name, bool* bad_class_name) { 194 if (name == nullptr) { 195 if (bad_class_name != nullptr) { 196 *bad_class_name = true; 197 } 198 return nullptr; 199 } 200 201 int utf_len = name->utf8_length(); 202 const jbyte* base = (const jbyte*)name->base(); 203 const jbyte* start = base; 204 const jbyte* end = UTF8::strrchr(start, utf_len, JVM_SIGNATURE_SLASH); 205 if (end == nullptr) { 206 return nullptr; 207 } 208 // Skip over '['s 209 if (*start == JVM_SIGNATURE_ARRAY) { 210 do { 211 start++; 212 } while (start < end && *start == JVM_SIGNATURE_ARRAY); 213 214 // Fully qualified class names should not contain a 'L'. 215 // Set bad_class_name to true to indicate that the package name 216 // could not be obtained due to an error condition. 217 // In this situation, is_same_class_package returns false. 218 if (*start == JVM_SIGNATURE_CLASS) { 219 if (bad_class_name != nullptr) { 220 *bad_class_name = true; 221 } 222 return nullptr; 223 } 224 } 225 // A class name could have just the slash character in the name, 226 // in which case start > end 227 if (start >= end) { 228 // No package name 229 if (bad_class_name != nullptr) { 230 *bad_class_name = true; 231 } 232 return nullptr; 233 } 234 return SymbolTable::new_symbol(name, pointer_delta_as_int(start, base), pointer_delta_as_int(end, base)); 235 } 236 237 // -------------------------------- 238 // The following jimage_xxx static functions encapsulate all JImage_file and Preview_mode access. 239 // This is done to make it easy to reason about the JImage file state (exists vs initialized etc.). 240 241 // Opens the named JImage file and sets the JImage file reference. 242 // Returns true if opening the JImage file was successful (see also jimage_exists()). 243 static bool jimage_open(const char* modules_path) { 244 // Currently 'error' is not set to anything useful, so ignore it here. 245 jint error; 246 JImage_file = (*JImageOpen)(modules_path, &error); 247 return JImage_file != nullptr; 248 } 249 250 // Closes and clears the JImage file reference (this will only be called during shutdown). 251 static void jimage_close() { 252 if (JImage_file != nullptr) { 253 (*JImageClose)(JImage_file); 254 JImage_file = nullptr; 255 } 256 } 257 258 // Returns whether a JImage file was opened (but NOT whether it was initialized yet). 259 static bool jimage_exists() { 260 return JImage_file != nullptr; 261 } 262 263 // Returns the JImage file reference (which may or may not be initialized). 264 static JImageFile* jimage_non_null() { 265 assert(jimage_exists(), "should have been opened by ClassLoader::lookup_vm_options " 266 "and remained throughout normal JVM lifetime"); 267 return JImage_file; 268 } 269 270 // Returns true if jimage_init() has been called. Once the JImage file is initialized, 271 // jimage_is_preview_enabled() can be called to correctly determine the access mode. 272 static bool jimage_is_initialized() { 273 return jimage_exists() && Preview_mode != PREVIEW_MODE_UNINITIALIZED; 274 } 275 276 // Returns the access mode for an initialized JImage file (reflects --enable-preview). 277 static bool is_preview_enabled() { 278 return Preview_mode == PREVIEW_MODE_ENABLE_PREVIEW; 279 } 280 281 // Looks up the location of a named JImage resource. This "raw" lookup function allows 282 // the preview mode to be manually specified, so must not be accessible outside this 283 // class. ClassPathImageEntry manages all calls for resources after startup is complete. 284 static JImageLocationRef jimage_find_resource(const char* module_name, 285 const char* file_name, 286 bool is_preview, 287 jlong *size) { 288 return ((*JImageFindResource)(jimage_non_null(), 289 module_name, 290 file_name, 291 is_preview, 292 size)); 293 } 294 // -------------------------------- 295 296 // Given a fully qualified package name, find its defining package in the class loader's 297 // package entry table. 298 PackageEntry* ClassLoader::get_package_entry(Symbol* pkg_name, ClassLoaderData* loader_data) { 299 if (pkg_name == nullptr) { 300 return nullptr; 301 } 302 PackageEntryTable* pkgEntryTable = loader_data->packages(); 303 return pkgEntryTable->lookup_only(pkg_name); 304 } 305 306 const char* ClassPathEntry::copy_path(const char* path) { 307 char* copy = NEW_C_HEAP_ARRAY(char, strlen(path)+1, mtClass); 308 strcpy(copy, path); 309 return copy; 310 } 311 312 ClassPathDirEntry::~ClassPathDirEntry() { 313 FREE_C_HEAP_ARRAY(char, _dir); 314 } 315 316 ClassFileStream* ClassPathDirEntry::open_stream(JavaThread* current, const char* name) { 317 // construct full path name 318 assert((_dir != nullptr) && (name != nullptr), "sanity"); 319 size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1; 320 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(current, char, path_len); 321 int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name); 322 assert(len == (int)(path_len - 1), "sanity"); 323 // check if file exists 324 struct stat st; 325 if (os::stat(path, &st) == 0) { 326 // found file, open it 327 int file_handle = os::open(path, 0, 0); 328 if (file_handle != -1) { 329 // read contents into resource array 330 u1* buffer = NEW_RESOURCE_ARRAY_IN_THREAD(current, u1, st.st_size); 331 size_t num_read = ::read(file_handle, (char*) buffer, st.st_size); 332 // close file 333 ::close(file_handle); 334 // construct ClassFileStream 335 if (num_read == (size_t)st.st_size) { 336 if (UsePerfData) { 337 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read); 338 } 339 #ifdef ASSERT 340 // Freeing path is a no-op here as buffer prevents it from being reclaimed. But we keep it for 341 // debug builds so that we guard against use-after-free bugs. 342 FREE_RESOURCE_ARRAY_IN_THREAD(current, char, path, path_len); 343 #endif 344 // We don't verify the length of the classfile stream fits in an int, but this is the 345 // bootloader so we have control of this. 346 // Resource allocated 347 return new ClassFileStream(buffer, 348 checked_cast<int>(st.st_size), 349 _dir); 350 } 351 } 352 } 353 FREE_RESOURCE_ARRAY_IN_THREAD(current, char, path, path_len); 354 return nullptr; 355 } 356 357 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() { 358 _zip = zip; 359 _zip_name = copy_path(zip_name); 360 } 361 362 ClassPathZipEntry::~ClassPathZipEntry() { 363 ZipLibrary::close(_zip); 364 FREE_C_HEAP_ARRAY(char, _zip_name); 365 } 366 367 bool ClassPathZipEntry::has_entry(JavaThread* current, const char* name) { 368 ThreadToNativeFromVM ttn(current); 369 // check whether zip archive contains name 370 jint name_len; 371 jint filesize; 372 jzentry* entry = ZipLibrary::find_entry(_zip, name, &filesize, &name_len); 373 if (entry == nullptr) { 374 return false; 375 } else { 376 ZipLibrary::free_entry(_zip, entry); 377 return true; 378 } 379 } 380 381 u1* ClassPathZipEntry::open_entry(JavaThread* current, const char* name, jint* filesize, bool nul_terminate) { 382 // enable call to C land 383 ThreadToNativeFromVM ttn(current); 384 // check whether zip archive contains name 385 jint name_len; 386 jzentry* entry = ZipLibrary::find_entry(_zip, name, filesize, &name_len); 387 if (entry == nullptr) return nullptr; 388 u1* buffer; 389 char name_buf[128]; 390 char* filename; 391 if (name_len < 128) { 392 filename = name_buf; 393 } else { 394 filename = NEW_RESOURCE_ARRAY(char, name_len + 1); 395 } 396 397 // read contents into resource array 398 size_t size = (uint32_t)(*filesize); 399 if (nul_terminate) { 400 if (sizeof(size) == sizeof(uint32_t) && size == UINT_MAX) { 401 return nullptr; // 32-bit integer overflow will occur. 402 } 403 size++; 404 } 405 buffer = NEW_RESOURCE_ARRAY(u1, size); 406 if (!ZipLibrary::read_entry(_zip, entry, buffer, filename)) { 407 return nullptr; 408 } 409 410 // return result 411 if (nul_terminate) { 412 buffer[size - 1] = 0; 413 } 414 return buffer; 415 } 416 417 ClassFileStream* ClassPathZipEntry::open_stream(JavaThread* current, const char* name) { 418 jint filesize; 419 u1* buffer = open_entry(current, name, &filesize, false); 420 if (buffer == nullptr) { 421 return nullptr; 422 } 423 if (UsePerfData) { 424 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize); 425 } 426 // Resource allocated 427 return new ClassFileStream(buffer, 428 filesize, 429 _zip_name); 430 } 431 432 DEBUG_ONLY(ClassPathImageEntry* ClassPathImageEntry::_singleton = nullptr;) 433 434 void ClassPathImageEntry::close_jimage() { 435 jimage_close(); 436 } 437 438 ClassPathImageEntry::ClassPathImageEntry(const char* name) : 439 ClassPathEntry() { 440 guarantee(jimage_is_initialized(), "jimage is not initialized"); 441 guarantee(name != nullptr, "jimage file name is null"); 442 443 assert(_singleton == nullptr, "VM supports only one jimage"); 444 DEBUG_ONLY(_singleton = this); 445 size_t len = strlen(name) + 1; 446 _name = copy_path(name); 447 } 448 449 ClassFileStream* ClassPathImageEntry::open_stream(JavaThread* current, const char* name) { 450 return open_stream_for_loader(current, name, ClassLoaderData::the_null_class_loader_data()); 451 } 452 453 // For a class in a named module, look it up in the jimage file using this syntax: 454 // /<module-name>/<package-name>/<base-class> 455 // 456 // Assumptions: 457 // 1. There are no unnamed modules in the jimage file. 458 // 2. A package is in at most one module in the jimage file. 459 // 460 ClassFileStream* ClassPathImageEntry::open_stream_for_loader(JavaThread* current, const char* name, ClassLoaderData* loader_data) { 461 const bool is_preview = is_preview_enabled(); 462 463 jlong size; 464 JImageLocationRef location = 0; 465 466 TempNewSymbol class_name = SymbolTable::new_symbol(name); 467 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name); 468 469 if (pkg_name != nullptr) { 470 if (!Universe::is_module_initialized()) { 471 location = jimage_find_resource(JAVA_BASE_NAME, name, is_preview, &size); 472 } else { 473 PackageEntry* package_entry = ClassLoader::get_package_entry(pkg_name, loader_data); 474 if (package_entry != nullptr) { 475 ResourceMark rm(current); 476 // Get the module name 477 ModuleEntry* module = package_entry->module(); 478 assert(module != nullptr, "Boot classLoader package missing module"); 479 assert(module->is_named(), "Boot classLoader package is in unnamed module"); 480 const char* module_name = module->name()->as_C_string(); 481 if (module_name != nullptr) { 482 location = jimage_find_resource(module_name, name, is_preview, &size); 483 } 484 } 485 } 486 } 487 488 if (location != 0) { 489 if (UsePerfData) { 490 ClassLoader::perf_sys_classfile_bytes_read()->inc(size); 491 } 492 char* data = NEW_RESOURCE_ARRAY(char, size); 493 (*JImageGetResource)(jimage_non_null(), location, data, size); 494 // Resource allocated 495 assert(this == ClassLoader::get_jrt_entry(), "must be"); 496 return new ClassFileStream((u1*)data, 497 checked_cast<int>(size), 498 _name, 499 true); // from_boot_loader_modules_image 500 } 501 502 return nullptr; 503 } 504 505 bool ClassPathImageEntry::is_modules_image() const { 506 assert(this == _singleton, "VM supports a single jimage"); 507 assert(this == ClassLoader::get_jrt_entry(), "must be used for jrt entry"); 508 return true; 509 } 510 511 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) { 512 _module_name = module_name; 513 _module_first_entry = nullptr; 514 _module_last_entry = nullptr; 515 } 516 517 ModuleClassPathList::~ModuleClassPathList() { 518 // Clean out each ClassPathEntry on list 519 ClassPathEntry* e = _module_first_entry; 520 while (e != nullptr) { 521 ClassPathEntry* next_entry = e->next(); 522 delete e; 523 e = next_entry; 524 } 525 } 526 527 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) { 528 if (new_entry != nullptr) { 529 if (_module_last_entry == nullptr) { 530 _module_first_entry = _module_last_entry = new_entry; 531 } else { 532 _module_last_entry->set_next(new_entry); 533 _module_last_entry = new_entry; 534 } 535 } 536 } 537 538 void ClassLoader::trace_class_path(const char* msg, const char* name) { 539 LogTarget(Info, class, path) lt; 540 if (lt.is_enabled()) { 541 LogStream ls(lt); 542 if (msg) { 543 ls.print("%s", msg); 544 } 545 if (name) { 546 if (strlen(name) < 256) { 547 ls.print("%s", name); 548 } else { 549 // For very long paths, we need to print each character separately, 550 // as print_cr() has a length limit 551 while (name[0] != '\0') { 552 ls.print("%c", name[0]); 553 name++; 554 } 555 } 556 } 557 ls.cr(); 558 } 559 } 560 561 void ClassLoader::setup_bootstrap_search_path(JavaThread* current) { 562 const char* bootcp = Arguments::get_boot_class_path(); 563 assert(bootcp != nullptr, "Boot class path must not be nullptr"); 564 if (PrintSharedArchiveAndExit) { 565 // Don't print bootcp - this is the bootcp of this current VM process, not necessarily 566 // the same as the boot classpath of the shared archive. 567 } else { 568 trace_class_path("bootstrap loader class path=", bootcp); 569 } 570 setup_bootstrap_search_path_impl(current, bootcp); 571 } 572 573 void ClassLoader::close_jrt_image() { 574 // Not applicable for exploded builds 575 if (!ClassLoader::has_jrt_entry()) return; 576 _jrt_entry->close_jimage(); 577 } 578 579 // Construct the array of module/path pairs as specified to --patch-module 580 // for the boot loader to search ahead of the jimage, if the class being 581 // loaded is defined to a module that has been specified to --patch-module. 582 void ClassLoader::setup_patch_mod_entries() { 583 JavaThread* current = JavaThread::current(); 584 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix(); 585 int num_of_entries = patch_mod_args->length(); 586 587 // Set up the boot loader's _patch_mod_entries list 588 _patch_mod_entries = new (mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, mtModule); 589 590 for (int i = 0; i < num_of_entries; i++) { 591 const char* module_name = (patch_mod_args->at(i))->module_name(); 592 Symbol* const module_sym = SymbolTable::new_symbol(module_name); 593 assert(module_sym != nullptr, "Failed to obtain Symbol for module name"); 594 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym); 595 596 char* class_path = (patch_mod_args->at(i))->path_string(); 597 ResourceMark rm(current); 598 ClasspathStream cp_stream(class_path); 599 600 while (cp_stream.has_next()) { 601 const char* path = cp_stream.get_next(); 602 struct stat st; 603 if (os::stat(path, &st) == 0) { 604 // File or directory found 605 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st); 606 // If the path specification is valid, enter it into this module's list 607 if (new_entry != nullptr) { 608 module_cpl->add_to_list(new_entry); 609 } 610 } 611 } 612 613 // Record the module into the list of --patch-module entries only if 614 // valid ClassPathEntrys have been created 615 if (module_cpl->module_first_entry() != nullptr) { 616 _patch_mod_entries->push(module_cpl); 617 } 618 } 619 } 620 621 // Determine whether the module has been patched via the command-line 622 // option --patch-module 623 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) { 624 if (_patch_mod_entries != nullptr && _patch_mod_entries->is_nonempty()) { 625 int table_len = _patch_mod_entries->length(); 626 for (int i = 0; i < table_len; i++) { 627 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i); 628 if (module_name->fast_compare(patch_mod->module_name()) == 0) { 629 return true; 630 } 631 } 632 } 633 return false; 634 } 635 636 // Set up the _jrt_entry if present and boot append path 637 void ClassLoader::setup_bootstrap_search_path_impl(JavaThread* current, const char *class_path) { 638 ResourceMark rm(current); 639 ClasspathStream cp_stream(class_path); 640 bool set_base_piece = true; 641 642 #if INCLUDE_CDS 643 if (CDSConfig::is_dumping_archive()) { 644 if (!Arguments::has_jimage()) { 645 vm_exit_during_initialization("CDS is not supported in exploded JDK build", nullptr); 646 } 647 } 648 #endif 649 650 while (cp_stream.has_next()) { 651 const char* path = cp_stream.get_next(); 652 653 if (set_base_piece) { 654 // The first time through the bootstrap_search setup, it must be determined 655 // what the base or core piece of the boot loader search is. Either a java runtime 656 // image is present or this is an exploded module build situation. 657 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME), 658 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build"); 659 struct stat st; 660 if (os::stat(path, &st) == 0) { 661 // Directory found 662 if (jimage_exists()) { 663 assert(Arguments::has_jimage(), "sanity check"); 664 const char* canonical_path = get_canonical_path(path, current); 665 assert(canonical_path != nullptr, "canonical_path issue"); 666 667 // Hand over lifecycle control of the JImage file to the _jrt_entry singleton 668 // (see ClassPathImageEntry::close_jimage). The image must be initialized by now. 669 _jrt_entry = new ClassPathImageEntry(canonical_path); 670 assert(_jrt_entry != nullptr && _jrt_entry->is_modules_image(), "No java runtime image present"); 671 } // else it's an exploded build. 672 } else { 673 // If path does not exist, exit 674 vm_exit_during_initialization("Unable to establish the boot loader search path", path); 675 } 676 set_base_piece = false; 677 } else { 678 // Every entry on the boot class path after the initial base piece, 679 // which is set by os::set_boot_path(), is considered an appended entry. 680 update_class_path_entry_list(current, path); 681 } 682 } 683 } 684 685 // Gets the exploded path for the named module. The memory for the path 686 // is allocated on the C heap if `c_heap` is true otherwise in the resource area. 687 static const char* get_exploded_module_path(const char* module_name, bool c_heap) { 688 const char *home = Arguments::get_java_home(); 689 const char file_sep = os::file_separator()[0]; 690 // 10 represents the length of "modules" (7) + 2 file separators + \0 691 size_t len = strlen(home) + strlen(module_name) + 10; 692 char *path = c_heap ? NEW_C_HEAP_ARRAY(char, len, mtModule) : NEW_RESOURCE_ARRAY(char, len); 693 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name); 694 return path; 695 } 696 697 // Gets a preview path for a given class path as a resource. 698 static const char* get_preview_path(const char* path) { 699 const char file_sep = os::file_separator()[0]; 700 // 18 represents the length of "META-INF" (8) + "preview" (7) + 2 file separators + \0 701 size_t len = strlen(path) + 18; 702 char *preview_path = NEW_RESOURCE_ARRAY(char, len); 703 jio_snprintf(preview_path, len, "%s%cMETA-INF%cpreview", path, file_sep, file_sep); 704 return preview_path; 705 } 706 707 // During an exploded modules build, each module defined to the boot loader 708 // will be added to the ClassLoader::_exploded_entries array. 709 void ClassLoader::add_to_exploded_build_list(JavaThread* current, Symbol* module_sym) { 710 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable"); 711 assert(_exploded_entries != nullptr, "_exploded_entries was not initialized"); 712 713 // Find the module's symbol 714 ResourceMark rm(current); 715 const char *module_name = module_sym->as_C_string(); 716 const char *path = get_exploded_module_path(module_name, false); 717 718 struct stat st; 719 if (os::stat(path, &st) == 0) { 720 // Directory found 721 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st); 722 // If the path specification is valid, enter it into this module's list. 723 // There is no need to check for duplicate modules in the exploded entry list, 724 // since no two modules with the same name can be defined to the boot loader. 725 // This is checked at module definition time in Modules::define_module. 726 if (new_entry != nullptr) { 727 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym); 728 log_info(class, load)("path: %s", path); 729 730 // If we are in preview mode, attempt to add a preview entry *before* the 731 // new class path entry if a preview path exists. 732 if (is_preview_enabled()) { 733 const char* preview_path = get_preview_path(path); 734 if (os::stat(preview_path, &st) == 0) { 735 ClassPathEntry* preview_entry = create_class_path_entry(current, preview_path, &st); 736 if (preview_entry != nullptr) { 737 module_cpl->add_to_list(preview_entry); 738 log_info(class, load)("preview path: %s", preview_path); 739 } 740 } 741 } 742 743 module_cpl->add_to_list(new_entry); 744 { 745 MutexLocker ml(current, Module_lock); 746 _exploded_entries->push(module_cpl); 747 } 748 } 749 } 750 } 751 752 jzfile* ClassLoader::open_zip_file(const char* canonical_path, char** error_msg, JavaThread* thread) { 753 // enable call to C land 754 ThreadToNativeFromVM ttn(thread); 755 HandleMark hm(thread); 756 return ZipLibrary::open(canonical_path, error_msg); 757 } 758 759 ClassPathEntry* ClassLoader::create_class_path_entry(JavaThread* current, 760 const char *path, const struct stat* st) { 761 ClassPathEntry* new_entry = nullptr; 762 if ((st->st_mode & S_IFMT) == S_IFREG) { 763 ResourceMark rm(current); 764 // Regular file, should be a zip file 765 // Canonicalized filename 766 const char* canonical_path = get_canonical_path(path, current); 767 if (canonical_path == nullptr) { 768 return nullptr; 769 } 770 char* error_msg = nullptr; 771 jzfile* zip = open_zip_file(canonical_path, &error_msg, current); 772 if (zip != nullptr && error_msg == nullptr) { 773 new_entry = new ClassPathZipEntry(zip, path); 774 } else { 775 return nullptr; 776 } 777 log_info(class, path)("opened: %s", path); 778 log_info(class, load)("opened: %s", path); 779 } else { 780 // Directory 781 new_entry = new ClassPathDirEntry(path); 782 log_info(class, load)("path: %s", path); 783 } 784 return new_entry; 785 } 786 787 788 // Create a class path zip entry for a given path (return null if not found 789 // or zip/JAR file cannot be opened) 790 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) { 791 // check for a regular file 792 struct stat st; 793 if (os::stat(path, &st) == 0) { 794 if ((st.st_mode & S_IFMT) == S_IFREG) { 795 JavaThread* thread = JavaThread::current(); 796 ResourceMark rm(thread); 797 const char* canonical_path = get_canonical_path(path, thread); 798 if (canonical_path != nullptr) { 799 char* error_msg = nullptr; 800 jzfile* zip = open_zip_file(canonical_path, &error_msg, thread); 801 if (zip != nullptr && error_msg == nullptr) { 802 // create using canonical path 803 return new ClassPathZipEntry(zip, canonical_path); 804 } 805 } 806 } 807 } 808 return nullptr; 809 } 810 811 // The boot append entries are added with a lock, and read lock free. 812 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) { 813 if (new_entry != nullptr) { 814 MutexLocker ml(Bootclasspath_lock, Mutex::_no_safepoint_check_flag); 815 if (_last_append_entry == nullptr) { 816 _last_append_entry = new_entry; 817 assert(first_append_entry() == nullptr, "boot loader's append class path entry list not empty"); 818 AtomicAccess::release_store(&_first_append_entry_list, new_entry); 819 } else { 820 _last_append_entry->set_next(new_entry); 821 _last_append_entry = new_entry; 822 } 823 } 824 } 825 826 // Returns true IFF the file/dir exists and the entry was successfully created. 827 bool ClassLoader::update_class_path_entry_list(JavaThread* current, const char *path) { 828 struct stat st; 829 if (os::stat(path, &st) == 0) { 830 // File or directory found 831 ClassPathEntry* new_entry = nullptr; 832 new_entry = create_class_path_entry(current, path, &st); 833 if (new_entry == nullptr) { 834 return false; 835 } 836 837 // Do not reorder the bootclasspath which would break get_system_package(). 838 // Add new entry to linked list 839 add_to_boot_append_entries(new_entry); 840 return true; 841 } else { 842 return false; 843 } 844 } 845 846 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) { 847 ResourceMark rm; 848 int num_of_entries = module_list->length(); 849 for (int i = 0; i < num_of_entries; i++) { 850 ClassPathEntry* e; 851 ModuleClassPathList* mpl = module_list->at(i); 852 tty->print("%s=", mpl->module_name()->as_C_string()); 853 e = mpl->module_first_entry(); 854 while (e != nullptr) { 855 tty->print("%s", e->name()); 856 e = e->next(); 857 if (e != nullptr) { 858 tty->print("%s", os::path_separator()); 859 } 860 } 861 tty->print(" ;"); 862 } 863 } 864 865 void ClassLoader::print_bootclasspath() { 866 ClassPathEntry* e; 867 tty->print("[bootclasspath= "); 868 869 // Print --patch-module module/path specifications first 870 if (_patch_mod_entries != nullptr) { 871 print_module_entry_table(_patch_mod_entries); 872 } 873 874 // [jimage | exploded modules build] 875 if (has_jrt_entry()) { 876 // Print the location of the java runtime image 877 tty->print("%s ;", _jrt_entry->name()); 878 } else { 879 // Print exploded module build path specifications 880 if (_exploded_entries != nullptr) { 881 print_module_entry_table(_exploded_entries); 882 } 883 } 884 885 // appended entries 886 e = first_append_entry(); 887 while (e != nullptr) { 888 tty->print("%s ;", e->name()); 889 e = e->next(); 890 } 891 tty->print_cr("]"); 892 } 893 894 void* ClassLoader::dll_lookup(void* lib, const char* name, const char* path) { 895 void* func = os::dll_lookup(lib, name); 896 if (func == nullptr) { 897 char msg[256] = ""; 898 jio_snprintf(msg, sizeof(msg), "Could not resolve \"%s\"", name); 899 vm_exit_during_initialization(msg, path); 900 } 901 return func; 902 } 903 904 void ClassLoader::load_java_library() { 905 assert(CanonicalizeEntry == nullptr, "should not load java library twice"); 906 if (is_vm_statically_linked()) { 907 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::lookup_function("JDK_Canonicalize")); 908 assert(CanonicalizeEntry != nullptr, "could not lookup JDK_Canonicalize"); 909 return; 910 } 911 912 void *javalib_handle = os::native_java_library(); 913 if (javalib_handle == nullptr) { 914 vm_exit_during_initialization("Unable to load java library", nullptr); 915 } 916 917 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, dll_lookup(javalib_handle, "JDK_Canonicalize", nullptr)); 918 assert(CanonicalizeEntry != nullptr, "could not lookup JDK_Canonicalize in java library"); 919 } 920 921 void ClassLoader::load_jimage_library() { 922 assert(JImageOpen == nullptr, "should not load jimage library twice"); 923 924 if (is_vm_statically_linked()) { 925 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::lookup_function("JIMAGE_Open")); 926 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::lookup_function("JIMAGE_Close")); 927 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::lookup_function("JIMAGE_FindResource")); 928 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::lookup_function("JIMAGE_GetResource")); 929 assert(JImageOpen != nullptr && JImageClose != nullptr && 930 JImageFindResource != nullptr && JImageGetResource != nullptr, 931 "could not lookup all jimage library functions"); 932 return; 933 } 934 935 char path[JVM_MAXPATHLEN]; 936 char ebuf[1024]; 937 void* handle = nullptr; 938 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) { 939 handle = os::dll_load(path, ebuf, sizeof ebuf); 940 } 941 if (handle == nullptr) { 942 vm_exit_during_initialization("Unable to load jimage library", path); 943 } 944 945 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, dll_lookup(handle, "JIMAGE_Open", path)); 946 JImageClose = CAST_TO_FN_PTR(JImageClose_t, dll_lookup(handle, "JIMAGE_Close", path)); 947 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, dll_lookup(handle, "JIMAGE_FindResource", path)); 948 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, dll_lookup(handle, "JIMAGE_GetResource", path)); 949 assert(JImageOpen != nullptr && JImageClose != nullptr && 950 JImageFindResource != nullptr && JImageGetResource != nullptr, 951 "could not lookup all jimage library functions in jimage library"); 952 } 953 954 int ClassLoader::crc32(int crc, const char* buf, int len) { 955 return ZipLibrary::crc32(crc, (const jbyte*)buf, len); 956 } 957 958 oop ClassLoader::get_system_package(const char* name, TRAPS) { 959 // Look up the name in the boot loader's package entry table. 960 if (name != nullptr) { 961 TempNewSymbol package_sym = SymbolTable::new_symbol(name); 962 // Look for the package entry in the boot loader's package entry table. 963 PackageEntry* package = 964 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym); 965 966 // Return null if package does not exist or if no classes in that package 967 // have been loaded. 968 if (package != nullptr && package->has_loaded_class()) { 969 ModuleEntry* module = package->module(); 970 if (module->location() != nullptr) { 971 ResourceMark rm(THREAD); 972 Handle ml = java_lang_String::create_from_str( 973 module->location()->as_C_string(), THREAD); 974 return ml(); 975 } 976 // Return entry on boot loader class path. 977 Handle cph = java_lang_String::create_from_str( 978 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD); 979 return cph(); 980 } 981 } 982 return nullptr; 983 } 984 985 refArrayOop ClassLoader::get_system_packages(TRAPS) { 986 ResourceMark rm(THREAD); 987 // List of pointers to PackageEntrys that have loaded classes. 988 PackageEntryTable* pe_table = 989 ClassLoaderData::the_null_class_loader_data()->packages(); 990 GrowableArray<PackageEntry*>* loaded_class_pkgs = pe_table->get_system_packages(); 991 992 // Allocate objArray and fill with java.lang.String 993 refArrayOop r = oopFactory::new_refArray(vmClasses::String_klass(), 994 loaded_class_pkgs->length(), 995 CHECK_NULL); 996 refArrayHandle result(THREAD, r); 997 for (int x = 0; x < loaded_class_pkgs->length(); x++) { 998 PackageEntry* package_entry = loaded_class_pkgs->at(x); 999 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL); 1000 result->obj_at_put(x, str()); 1001 } 1002 return result(); 1003 } 1004 1005 // caller needs ResourceMark 1006 const char* ClassLoader::file_name_for_class_name(const char* class_name, 1007 int class_name_len) { 1008 assert(class_name != nullptr, "invariant"); 1009 assert((int)strlen(class_name) == class_name_len, "invariant"); 1010 1011 static const char class_suffix[] = ".class"; 1012 size_t class_suffix_len = sizeof(class_suffix); 1013 1014 char* const file_name = NEW_RESOURCE_ARRAY(char, 1015 class_name_len + 1016 class_suffix_len); // includes term null 1017 1018 strncpy(file_name, class_name, class_name_len); 1019 strncpy(&file_name[class_name_len], class_suffix, class_suffix_len); 1020 1021 return file_name; 1022 } 1023 1024 static ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry, 1025 const GrowableArray<ModuleClassPathList*>* const module_list) { 1026 int num_of_entries = module_list->length(); 1027 const Symbol* class_module_name = mod_entry->name(); 1028 1029 // Loop through all the modules in either the patch-module or exploded entries looking for module 1030 for (int i = 0; i < num_of_entries; i++) { 1031 ModuleClassPathList* module_cpl = module_list->at(i); 1032 Symbol* module_cpl_name = module_cpl->module_name(); 1033 1034 if (module_cpl_name->fast_compare(class_module_name) == 0) { 1035 // Class' module has been located. 1036 return module_cpl->module_first_entry(); 1037 } 1038 } 1039 return nullptr; 1040 } 1041 1042 1043 // Search the module list for the class file stream based on the file name and java package 1044 ClassFileStream* ClassLoader::search_module_entries(JavaThread* current, 1045 const GrowableArray<ModuleClassPathList*>* const module_list, 1046 PackageEntry* pkg_entry, // Java package entry derived from the class name 1047 const char* const file_name) { 1048 ClassFileStream* stream = nullptr; 1049 1050 // Find the defining module in the boot loader's module entry table 1051 ModuleEntry* mod_entry = (pkg_entry != nullptr) ? pkg_entry->module() : nullptr; 1052 1053 // If the module system has not defined java.base yet, then 1054 // classes loaded are assumed to be defined to java.base. 1055 // When java.base is eventually defined by the module system, 1056 // all packages of classes that have been previously loaded 1057 // are verified in ModuleEntryTable::verify_javabase_packages(). 1058 if (!Universe::is_module_initialized() && 1059 !ModuleEntryTable::javabase_defined() && 1060 mod_entry == nullptr) { 1061 mod_entry = ModuleEntryTable::javabase_moduleEntry(); 1062 } 1063 1064 // The module must be a named module 1065 ClassPathEntry* e = nullptr; 1066 if (mod_entry != nullptr && mod_entry->is_named()) { 1067 if (module_list == _exploded_entries) { 1068 // The exploded build entries can be added to at any time so a lock is 1069 // needed when searching them. 1070 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build"); 1071 MutexLocker ml(current, Module_lock); 1072 e = find_first_module_cpe(mod_entry, module_list); 1073 } else { 1074 e = find_first_module_cpe(mod_entry, module_list); 1075 } 1076 } 1077 1078 // Try to load the class from the module's ClassPathEntry list. 1079 while (e != nullptr) { 1080 stream = e->open_stream(current, file_name); 1081 // No context.check is required since CDS is not supported 1082 // for an exploded modules build or if --patch-module is specified. 1083 if (nullptr != stream) { 1084 return stream; 1085 } 1086 e = e->next(); 1087 } 1088 // If the module was located, break out even if the class was not 1089 // located successfully from that module's ClassPathEntry list. 1090 // There will not be another valid entry for that module. 1091 return nullptr; 1092 } 1093 1094 // Called by the boot classloader to load classes 1095 InstanceKlass* ClassLoader::load_class(Symbol* name, PackageEntry* pkg_entry, bool search_append_only, TRAPS) { 1096 assert(name != nullptr, "invariant"); 1097 1098 ResourceMark rm(THREAD); 1099 HandleMark hm(THREAD); 1100 1101 const char* const class_name = name->as_C_string(); 1102 1103 EventMarkClassLoading m("Loading class %s", class_name); 1104 1105 const char* const file_name = file_name_for_class_name(class_name, 1106 name->utf8_length()); 1107 assert(file_name != nullptr, "invariant"); 1108 1109 // Lookup stream for parsing .class file 1110 ClassFileStream* stream = nullptr; 1111 s2 classpath_index = 0; 1112 ClassPathEntry* e = nullptr; 1113 bool is_patched = false; 1114 1115 // If search_append_only is true, boot loader visibility boundaries are 1116 // set to be _first_append_entry to the end. This includes: 1117 // [-Xbootclasspath/a]; [jvmti appended entries] 1118 // 1119 // If search_append_only is false, boot loader visibility boundaries are 1120 // set to be the --patch-module entries plus the base piece. This includes: 1121 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build] 1122 // 1123 1124 // Load Attempt #1: --patch-module 1125 // Determine the class' defining module. If it appears in the _patch_mod_entries, 1126 // attempt to load the class from those locations specific to the module. 1127 // Specifications to --patch-module can contain a partial number of classes 1128 // that are part of the overall module definition. So if a particular class is not 1129 // found within its module specification, the search should continue to Load Attempt #2. 1130 // Note: The --patch-module entries are never searched if the boot loader's 1131 // visibility boundary is limited to only searching the append entries. 1132 if (_patch_mod_entries != nullptr && !search_append_only) { 1133 // At CDS dump time, the --patch-module entries are ignored. That means a 1134 // class is still loaded from the runtime image even if it might 1135 // appear in the _patch_mod_entries. The runtime shared class visibility 1136 // check will determine if a shared class is visible based on the runtime 1137 // environment, including the runtime --patch-module setting. 1138 if (!Arguments::is_valhalla_enabled()) { 1139 // Dynamic dumping requires UseSharedSpaces to be enabled. Since --patch-module 1140 // is not supported with UseSharedSpaces, we can never come here during dynamic dumping. 1141 assert(!CDSConfig::is_dumping_archive(), "CDS doesn't support --patch-module during dumping"); 1142 } 1143 if (Arguments::is_valhalla_enabled() || !CDSConfig::is_dumping_static_archive()) { 1144 stream = search_module_entries(THREAD, _patch_mod_entries, pkg_entry, file_name); 1145 if (stream != nullptr) { 1146 is_patched = true; 1147 } 1148 } 1149 } 1150 1151 // Load Attempt #2: [jimage | exploded build] 1152 if (!search_append_only && (nullptr == stream)) { 1153 if (has_jrt_entry()) { 1154 e = _jrt_entry; 1155 stream = _jrt_entry->open_stream(THREAD, file_name); 1156 } else { 1157 // Exploded build - attempt to locate class in its defining module's location. 1158 assert(_exploded_entries != nullptr, "No exploded build entries present"); 1159 assert(!CDSConfig::is_dumping_archive(), "CDS dumping doesn't support exploded build"); 1160 stream = search_module_entries(THREAD, _exploded_entries, pkg_entry, file_name); 1161 } 1162 } 1163 1164 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries] 1165 if (search_append_only && (nullptr == stream)) { 1166 // For the boot loader append path search, the starting classpath_index 1167 // for the appended piece is always 1 to account for either the 1168 // _jrt_entry or the _exploded_entries. 1169 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly"); 1170 classpath_index = 1; 1171 1172 e = first_append_entry(); 1173 while (e != nullptr) { 1174 stream = e->open_stream(THREAD, file_name); 1175 if (nullptr != stream) { 1176 break; 1177 } 1178 e = e->next(); 1179 ++classpath_index; 1180 } 1181 } 1182 1183 if (nullptr == stream) { 1184 return nullptr; 1185 } 1186 1187 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 1188 Handle protection_domain; 1189 ClassLoadInfo cl_info(protection_domain); 1190 1191 InstanceKlass* result = KlassFactory::create_from_stream(stream, 1192 name, 1193 loader_data, 1194 cl_info, 1195 CHECK_NULL); 1196 result->set_classpath_index(classpath_index); 1197 if (is_patched) { 1198 result->set_shared_classpath_index(0); 1199 } 1200 return result; 1201 } 1202 1203 #if INCLUDE_CDS 1204 static const char* skip_uri_protocol(const char* source) { 1205 if (strncmp(source, "file:", 5) == 0) { 1206 // file: protocol path could start with file:/ or file:/// 1207 // locate the char after all the forward slashes 1208 int offset = 5; 1209 while (*(source + offset) == '/') { 1210 offset++; 1211 } 1212 source += offset; 1213 // for non-windows platforms, move back one char as the path begins with a '/' 1214 #ifndef _WINDOWS 1215 source -= 1; 1216 #endif 1217 } else if (strncmp(source, "jrt:/", 5) == 0) { 1218 source += 5; 1219 } 1220 return source; 1221 } 1222 1223 static char decode_percent_encoded(const char *str, size_t& index) { 1224 if (str[index] == '%' 1225 && isxdigit(str[index + 1]) 1226 && isxdigit(str[index + 2])) { 1227 char hex[3]; 1228 hex[0] = str[index + 1]; 1229 hex[1] = str[index + 2]; 1230 hex[2] = '\0'; 1231 index += 2; 1232 return (char) strtol(hex, nullptr, 16); 1233 } 1234 return str[index]; 1235 } 1236 1237 char* ClassLoader::uri_to_path(const char* uri) { 1238 const size_t len = strlen(uri) + 1; 1239 char* path = NEW_RESOURCE_ARRAY(char, len); 1240 1241 uri = skip_uri_protocol(uri); 1242 1243 if (strncmp(uri, "//", 2) == 0) { 1244 // Skip the empty "authority" part 1245 uri += 2; 1246 } 1247 1248 #ifdef _WINDOWS 1249 if (uri[0] == '/') { 1250 // Absolute path name on Windows does not begin with a slash 1251 uri += 1; 1252 } 1253 #endif 1254 1255 size_t path_index = 0; 1256 for (size_t i = 0; i < strlen(uri); ++i) { 1257 char decoded = decode_percent_encoded(uri, i); 1258 path[path_index++] = decoded; 1259 } 1260 path[path_index] = '\0'; 1261 return path; 1262 } 1263 1264 // Record the shared classpath index and loader type for classes loaded 1265 // by the builtin loaders at dump time. 1266 void ClassLoader::record_result(JavaThread* current, InstanceKlass* ik, 1267 const ClassFileStream* stream, bool redefined) { 1268 assert(CDSConfig::is_dumping_archive(), "sanity"); 1269 assert(stream != nullptr, "sanity"); 1270 1271 if (ik->is_hidden()) { 1272 record_hidden_class(ik); 1273 return; 1274 } 1275 1276 if (ik->shared_classpath_index() == 0 && ik->defined_by_boot_loader()) { 1277 return; 1278 } 1279 1280 oop loader = ik->class_loader(); 1281 char* src = (char*)stream->source(); 1282 if (src == nullptr) { 1283 ik->set_shared_classpath_index(-1); // unsupported location 1284 return; 1285 } 1286 1287 if (!SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) { 1288 // A class loaded by a user-defined classloader. 1289 assert(ik->shared_classpath_index() < 0, "not assigned yet"); 1290 ik->set_shared_classpath_index(UNREGISTERED_INDEX); 1291 SystemDictionaryShared::set_shared_class_misc_info(ik, (ClassFileStream*)stream); 1292 return; 1293 } 1294 1295 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build"); 1296 1297 ResourceMark rm(current); 1298 int classpath_index = -1; 1299 bool found_invalid = false; 1300 1301 PackageEntry* pkg_entry = ik->package(); 1302 1303 if (!AOTClassLocationConfig::dumptime_is_ready()) { 1304 // The shared path table is set up after module system initialization. 1305 // The path table contains no entry before that. Any classes loaded prior 1306 // to the setup of the shared path table must be from the modules image. 1307 assert(stream->from_boot_loader_modules_image(), "stream must be loaded by boot loader from modules image"); 1308 classpath_index = 0; 1309 } else { 1310 // Save the path from the file: protocol or the module name from the jrt: protocol 1311 // if no protocol prefix is found, path is the same as stream->source(). This path 1312 // must be valid since the class has been successfully parsed. 1313 const char* path = ClassLoader::uri_to_path(src); 1314 assert(path != nullptr, "sanity"); 1315 AOTClassLocationConfig::dumptime_iterate([&] (AOTClassLocation* cl) { 1316 int i = cl->index(); 1317 // for index 0 and the stream->source() is the modules image or has the jrt: protocol. 1318 // The class must be from the runtime modules image. 1319 if (cl->is_modules_image() && (stream->from_boot_loader_modules_image() || string_starts_with(src, "jrt:"))) { 1320 classpath_index = i; 1321 } else if (os::same_files(cl->path(), path)) { 1322 // If the path (from the class stream source) is the same as the shared 1323 // class or module path, then we have a match. 1324 // src may come from the App/Platform class loaders, which would canonicalize 1325 // the file name. We cannot use strcmp to check for equality against cs->path(). 1326 // We must use os::same_files (which is faster than canonicalizing cs->path()). 1327 1328 // null pkg_entry and pkg_entry in an unnamed module implies the class 1329 // is from the -cp or boot loader append path which consists of -Xbootclasspath/a 1330 // and jvmti appended entries. 1331 if ((pkg_entry == nullptr) || (pkg_entry->in_unnamed_module())) { 1332 // Ensure the index is within the -cp range before assigning 1333 // to the classpath_index. 1334 if (SystemDictionary::is_system_class_loader(loader) && cl->from_app_classpath()) { 1335 classpath_index = i; 1336 } else { 1337 if (cl->from_boot_classpath()) { 1338 if (loader != nullptr) { 1339 // Probably loaded by jdk/internal/loader/ClassLoaders$BootClassLoader. Don't archive 1340 // such classes. 1341 found_invalid = true; 1342 } else { 1343 classpath_index = i; 1344 } 1345 } 1346 } 1347 } else { 1348 // A class from a named module from the --module-path. Ensure the index is 1349 // within the --module-path range before assigning to the classpath_index. 1350 if ((pkg_entry != nullptr) && !(pkg_entry->in_unnamed_module()) && cl->from_module_path()) { 1351 classpath_index = i; 1352 } 1353 } 1354 } 1355 if (classpath_index >= 0 || found_invalid) { 1356 return false; // Break the AOTClassLocationConfig::dumptime_iterate() loop. 1357 } else { 1358 return true; // Keep iterating 1359 } 1360 }); 1361 } 1362 1363 if (found_invalid) { 1364 assert(classpath_index == -1, "sanity"); 1365 } 1366 1367 const char* const class_name = ik->name()->as_C_string(); 1368 const char* const file_name = file_name_for_class_name(class_name, 1369 ik->name()->utf8_length()); 1370 assert(file_name != nullptr, "invariant"); 1371 record_result_for_builtin_loader(checked_cast<s2>(classpath_index), ik, redefined); 1372 } 1373 1374 void ClassLoader::record_result_for_builtin_loader(s2 classpath_index, InstanceKlass* result, bool redefined) { 1375 assert(CDSConfig::is_dumping_archive(), "sanity"); 1376 1377 oop loader = result->class_loader(); 1378 if (SystemDictionary::is_system_class_loader(loader)) { 1379 AOTClassLocationConfig::dumptime_set_has_app_classes(); 1380 } else if (SystemDictionary::is_platform_class_loader(loader)) { 1381 AOTClassLocationConfig::dumptime_set_has_platform_classes(); 1382 } else { 1383 precond(loader == nullptr); 1384 } 1385 1386 if (CDSConfig::is_dumping_preimage_static_archive() || CDSConfig::is_dumping_dynamic_archive()) { 1387 if (!AOTClassLocationConfig::dumptime()->is_valid_classpath_index(classpath_index, result)) { 1388 classpath_index = -1; 1389 } 1390 } 1391 1392 AOTClassLocationConfig::dumptime_update_max_used_index(classpath_index); 1393 result->set_shared_classpath_index(classpath_index); 1394 } 1395 1396 void ClassLoader::record_hidden_class(InstanceKlass* ik) { 1397 assert(ik->is_hidden(), "must be"); 1398 1399 if (ik->defined_by_other_loaders()) { 1400 // We don't archive hidden classes for non-builtin loaders. 1401 return; 1402 } 1403 1404 if (HeapShared::is_lambda_proxy_klass(ik)) { 1405 InstanceKlass* nest_host = ik->nest_host_not_null(); 1406 ik->set_shared_classpath_index(nest_host->shared_classpath_index()); 1407 } else if (HeapShared::is_lambda_form_klass(ik)) { 1408 ik->set_shared_classpath_index(0); 1409 } else { 1410 // Generated invoker classes. 1411 if (ik->defined_by_app_loader()) { 1412 ik->set_shared_classpath_index(AOTClassLocationConfig::dumptime()->app_cp_start_index()); 1413 } else { 1414 ik->set_shared_classpath_index(0); 1415 } 1416 } 1417 } 1418 1419 void ClassLoader::append_boot_classpath(ClassPathEntry* new_entry) { 1420 if (CDSConfig::is_using_archive()) { 1421 warning("Sharing is only supported for boot loader classes because bootstrap classpath has been appended"); 1422 FileMapInfo::current_info()->set_has_platform_or_app_classes(false); 1423 if (DynamicArchive::is_mapped()) { 1424 FileMapInfo::dynamic_info()->set_has_platform_or_app_classes(false); 1425 } 1426 } 1427 add_to_boot_append_entries(new_entry); 1428 } 1429 #endif // INCLUDE_CDS 1430 1431 // Initialize the class loader's access to methods in libzip. Parse and 1432 // process the boot classpath into a list ClassPathEntry objects. Once 1433 // this list has been created, it must not change order (see class PackageInfo) 1434 // it can be appended to and is by jvmti. 1435 1436 void ClassLoader::initialize(TRAPS) { 1437 if (UsePerfData) { 1438 // jvmstat performance counters 1439 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time"); 1440 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime"); 1441 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self"); 1442 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime"); 1443 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self"); 1444 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime"); 1445 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self"); 1446 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses"); 1447 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses"); 1448 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses"); 1449 1450 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime"); 1451 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime"); 1452 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime"); 1453 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self"); 1454 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount"); 1455 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses"); 1456 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime"); 1457 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self"); 1458 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes"); 1459 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes"); 1460 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, "unsafeDefineClassCalls"); 1461 NEWPERFTICKCOUNTER(_perf_secondary_hash_time, SUN_CLS, "secondarySuperHashTime"); 1462 NEWPERFTICKCOUNTER(_perf_change_wx_time, SUN_CLS, "changeWXTime"); 1463 1464 if (log_is_enabled(Info, perf, class, link)) { 1465 NEWPERFTICKCOUNTER(_perf_ik_link_methods_time, SUN_CLS, "linkMethodsTime"); 1466 NEWPERFTICKCOUNTER(_perf_method_adapters_time, SUN_CLS, "makeAdaptersTime"); 1467 NEWPERFEVENTCOUNTER(_perf_ik_link_methods_count, SUN_CLS, "linkMethodsCount"); 1468 NEWPERFEVENTCOUNTER(_perf_method_adapters_count, SUN_CLS, "makeAdaptersCount"); 1469 1470 NEWPERFTICKCOUNTER(_perf_resolve_indy_time, SUN_CLS, "resolve_invokedynamic_time"); 1471 NEWPERFTICKCOUNTER(_perf_resolve_invokehandle_time, SUN_CLS, "resolve_invokehandle_time"); 1472 NEWPERFTICKCOUNTER(_perf_resolve_mh_time, SUN_CLS, "resolve_MethodHandle_time"); 1473 NEWPERFTICKCOUNTER(_perf_resolve_mt_time, SUN_CLS, "resolve_MethodType_time"); 1474 1475 NEWPERFEVENTCOUNTER(_perf_resolve_indy_count, SUN_CLS, "resolve_invokedynamic_count"); 1476 NEWPERFEVENTCOUNTER(_perf_resolve_invokehandle_count, SUN_CLS, "resolve_invokehandle_count"); 1477 NEWPERFEVENTCOUNTER(_perf_resolve_mh_count, SUN_CLS, "resolve_MethodHandle_count"); 1478 NEWPERFEVENTCOUNTER(_perf_resolve_mt_count, SUN_CLS, "resolve_MethodType_count"); 1479 } 1480 } 1481 1482 // lookup java library entry points 1483 load_java_library(); 1484 // jimage library entry points are loaded below, in lookup_vm_options 1485 setup_bootstrap_search_path(THREAD); 1486 } 1487 1488 // Lookup VM options embedded in the modules jimage file 1489 char* ClassLoader::lookup_vm_options() { 1490 char modules_path[JVM_MAXPATHLEN]; 1491 const char* fileSep = os::file_separator(); 1492 1493 // Initialize jimage library entry points 1494 load_jimage_library(); 1495 1496 jio_snprintf(modules_path, JVM_MAXPATHLEN, "%s%slib%smodules", Arguments::get_java_home(), fileSep, fileSep); 1497 if (jimage_open(modules_path)) { 1498 // Special case where we lookup the options string *before* set_preview_mode() is called. 1499 // Since VM arguments have not been parsed, and the ClassPathImageEntry singleton 1500 // has not been created yet, we access the JImage file directly in non-preview mode. 1501 jlong size; 1502 JImageLocationRef location = 1503 jimage_find_resource(JAVA_BASE_NAME, "jdk/internal/vm/options", /* is_preview */ false, &size); 1504 if (location != 0) { 1505 char *options = NEW_C_HEAP_ARRAY(char, size+1, mtClass); 1506 (*JImageGetResource)(jimage_non_null(), location, options, size); 1507 options[size] = '\0'; 1508 return options; 1509 } 1510 } 1511 return nullptr; 1512 } 1513 1514 // Finishes initializing the JImageFile (if present) by setting the access mode. 1515 void ClassLoader::set_preview_mode(bool enable_preview) { 1516 assert(Preview_mode == PREVIEW_MODE_UNINITIALIZED, "set_preview_mode must not be called twice"); 1517 Preview_mode = enable_preview ? PREVIEW_MODE_ENABLE_PREVIEW : PREVIEW_MODE_DEFAULT; 1518 } 1519 1520 bool ClassLoader::is_module_observable(const char* module_name) { 1521 assert(JImageOpen != nullptr, "jimage library should have been opened"); 1522 if (!jimage_exists()) { 1523 struct stat st; 1524 const char *path = get_exploded_module_path(module_name, true); 1525 bool res = os::stat(path, &st) == 0; 1526 FREE_C_HEAP_ARRAY(char, path); 1527 return res; 1528 } 1529 // We don't expect preview mode (i.e. --enable-preview) to affect module visibility. 1530 jlong size; 1531 return jimage_find_resource(module_name, "module-info.class", /* is_preview */ false, &size) != 0; 1532 } 1533 1534 jlong ClassLoader::classloader_time_ms() { 1535 return UsePerfData ? 1536 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1; 1537 } 1538 1539 jlong ClassLoader::class_init_count() { 1540 return UsePerfData ? _perf_classes_inited->get_value() : -1; 1541 } 1542 1543 jlong ClassLoader::class_init_time_ms() { 1544 return UsePerfData ? 1545 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1; 1546 } 1547 1548 jlong ClassLoader::class_verify_time_ms() { 1549 return UsePerfData ? 1550 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1; 1551 } 1552 1553 jlong ClassLoader::class_link_count() { 1554 return UsePerfData ? _perf_classes_linked->get_value() : -1; 1555 } 1556 1557 jlong ClassLoader::class_link_time_ms() { 1558 return UsePerfData ? 1559 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1; 1560 } 1561 1562 int ClassLoader::compute_Object_vtable() { 1563 // hardwired for JDK1.2 -- would need to duplicate class file parsing 1564 // code to determine actual value from file 1565 // Would be value '11' if finals were in vtable 1566 int JDK_1_2_Object_vtable_size = 5; 1567 return JDK_1_2_Object_vtable_size * vtableEntry::size(); 1568 } 1569 1570 1571 void classLoader_init1() { 1572 EXCEPTION_MARK; 1573 ClassLoader::initialize(THREAD); 1574 if (HAS_PENDING_EXCEPTION) { 1575 vm_exit_during_initialization("ClassLoader::initialize() failed unexpectedly"); 1576 } 1577 } 1578 1579 // Complete the ClassPathEntry setup for the boot loader 1580 void ClassLoader::classLoader_init2(JavaThread* current) { 1581 // Setup the list of module/path pairs for --patch-module processing 1582 // This must be done after the SymbolTable is created in order 1583 // to use fast_compare on module names instead of a string compare. 1584 if (Arguments::get_patch_mod_prefix() != nullptr) { 1585 setup_patch_mod_entries(); 1586 } 1587 1588 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries 1589 // to successfully determine if java.base has been patched) 1590 create_javabase(); 1591 1592 // Setup the initial java.base/path pair for the exploded build entries. 1593 // As more modules are defined during module system initialization, more 1594 // entries will be added to the exploded build array. 1595 if (!has_jrt_entry()) { 1596 assert(!CDSConfig::is_dumping_archive(), "not supported with exploded module builds"); 1597 assert(!CDSConfig::is_using_archive(), "UsedSharedSpaces not supported with exploded module builds"); 1598 // Set up the boot loader's _exploded_entries list. Note that this gets 1599 // done before loading any classes, by the same thread that will 1600 // subsequently do the first class load. So, no lock is needed for this. 1601 assert(_exploded_entries == nullptr, "Should only get initialized once"); 1602 _exploded_entries = new (mtModule) 1603 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, mtModule); 1604 add_to_exploded_build_list(current, vmSymbols::java_base()); 1605 } 1606 } 1607 1608 char* ClassLoader::get_canonical_path(const char* orig, Thread* thread) { 1609 assert(orig != nullptr, "bad arguments"); 1610 // caller needs to allocate ResourceMark for the following output buffer 1611 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN); 1612 ResourceMark rm(thread); 1613 // os::native_path writes into orig_copy 1614 char* orig_copy = ResourceArea::strdup(thread, orig); 1615 if ((CanonicalizeEntry)(os::native_path(orig_copy), canonical_path, JVM_MAXPATHLEN) < 0) { 1616 return nullptr; 1617 } 1618 return canonical_path; 1619 } 1620 1621 void ClassLoader::create_javabase() { 1622 JavaThread* current = JavaThread::current(); 1623 1624 // Create java.base's module entry for the boot 1625 // class loader prior to loading j.l.Object. 1626 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 1627 1628 // Get module entry table 1629 ModuleEntryTable* null_cld_modules = null_cld->modules(); 1630 if (null_cld_modules == nullptr) { 1631 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader"); 1632 } 1633 1634 { 1635 MutexLocker ml(current, Module_lock); 1636 if (ModuleEntryTable::javabase_moduleEntry() == nullptr) { // may have been inited by CDS. 1637 ModuleEntry* jb_module = null_cld_modules->locked_create_entry(Handle(), 1638 false, vmSymbols::java_base(), nullptr, nullptr, null_cld); 1639 if (jb_module == nullptr) { 1640 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME); 1641 } 1642 ModuleEntryTable::set_javabase_moduleEntry(jb_module); 1643 } 1644 } 1645 } 1646 1647 // Please keep following two functions at end of this file. With them placed at top or in middle of the file, 1648 // they could get inlined by aggressive compiler, an unknown trick, see bug 6966589. 1649 void PerfClassTraceTime::initialize() { 1650 if (!UsePerfData) return; 1651 1652 if (_eventp != nullptr) { 1653 // increment the event counter 1654 _eventp->inc(); 1655 } 1656 1657 // stop the current active thread-local timer to measure inclusive time 1658 _prev_active_event = -1; 1659 for (int i=0; i < EVENT_TYPE_COUNT; i++) { 1660 if (_timers[i].is_active()) { 1661 assert(_prev_active_event == -1, "should have only one active timer"); 1662 _prev_active_event = i; 1663 _timers[i].stop(); 1664 } 1665 } 1666 1667 if (_recursion_counters == nullptr || (_recursion_counters[_event_type])++ == 0) { 1668 // start the inclusive timer if not recursively called 1669 _t.start(); 1670 } 1671 1672 // start thread-local timer of the given event type 1673 if (!_timers[_event_type].is_active()) { 1674 _timers[_event_type].start(); 1675 } 1676 } 1677 1678 PerfClassTraceTime::~PerfClassTraceTime() { 1679 if (!UsePerfData) return; 1680 1681 // stop the thread-local timer as the event completes 1682 // and resume the thread-local timer of the event next on the stack 1683 _timers[_event_type].stop(); 1684 jlong selftime = _timers[_event_type].ticks(); 1685 1686 if (_prev_active_event >= 0) { 1687 _timers[_prev_active_event].start(); 1688 } 1689 1690 if (_recursion_counters != nullptr && --(_recursion_counters[_event_type]) > 0) return; 1691 1692 // increment the counters only on the leaf call 1693 _t.stop(); 1694 _timep->inc(_t.ticks()); 1695 if (_selftimep != nullptr) { 1696 _selftimep->inc(selftime); 1697 } 1698 // add all class loading related event selftime to the accumulated time counter 1699 ClassLoader::perf_accumulated_time()->inc(selftime); 1700 1701 // reset the timer 1702 _timers[_event_type].reset(); 1703 } --- EOF ---