1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "jimage.hpp" 28 #include "classfile/classFileStream.hpp" 29 #include "classfile/classLoader.inline.hpp" 30 #include "classfile/classLoaderData.inline.hpp" 31 #include "classfile/classLoaderExt.hpp" 32 #include "classfile/javaClasses.hpp" 33 #include "classfile/moduleEntry.hpp" 34 #include "classfile/modules.hpp" 35 #include "classfile/packageEntry.hpp" 36 #include "classfile/klassFactory.hpp" 37 #include "classfile/systemDictionary.hpp" 38 #include "classfile/vmSymbols.hpp" 39 #include "compiler/compileBroker.hpp" 40 #include "interpreter/bytecodeStream.hpp" 41 #include "interpreter/oopMapCache.hpp" 42 #include "logging/log.hpp" 43 #include "logging/logStream.hpp" 44 #include "logging/logTag.hpp" 45 #include "memory/allocation.inline.hpp" 46 #include "memory/filemap.hpp" 47 #include "memory/oopFactory.hpp" 48 #include "memory/resourceArea.hpp" 49 #include "memory/universe.hpp" 50 #include "oops/instanceKlass.hpp" 51 #include "oops/instanceRefKlass.hpp" 52 #include "oops/method.inline.hpp" 53 #include "oops/objArrayOop.inline.hpp" 54 #include "oops/oop.inline.hpp" 55 #include "oops/symbol.hpp" 56 #include "prims/jvm_misc.hpp" 57 #include "runtime/arguments.hpp" 58 #include "runtime/compilationPolicy.hpp" 59 #include "runtime/handles.hpp" 60 #include "runtime/handles.inline.hpp" 61 #include "runtime/init.hpp" 62 #include "runtime/interfaceSupport.inline.hpp" 63 #include "runtime/java.hpp" 64 #include "runtime/javaCalls.hpp" 65 #include "runtime/os.inline.hpp" 66 #include "runtime/threadCritical.hpp" 67 #include "runtime/timer.hpp" 68 #include "runtime/vm_version.hpp" 69 #include "services/management.hpp" 70 #include "services/threadService.hpp" 71 #include "utilities/events.hpp" 72 #include "utilities/hashtable.inline.hpp" 73 #include "utilities/macros.hpp" 74 #if INCLUDE_CDS 75 #include "classfile/sharedPathsMiscInfo.hpp" 76 #endif 77 78 // Entry points in zip.dll for loading zip/jar file entries 79 80 typedef void * * (*ZipOpen_t)(const char *name, char **pmsg); 81 typedef void (*ZipClose_t)(jzfile *zip); 82 typedef jzentry* (*FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen); 83 typedef jboolean (*ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf); 84 typedef jzentry* (*GetNextEntry_t)(jzfile *zip, jint n); 85 typedef jboolean (*ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg); 86 typedef jint (*Crc32_t)(jint crc, const jbyte *buf, jint len); 87 88 static ZipOpen_t ZipOpen = NULL; 89 static ZipClose_t ZipClose = NULL; 90 static FindEntry_t FindEntry = NULL; 91 static ReadEntry_t ReadEntry = NULL; 92 static GetNextEntry_t GetNextEntry = NULL; 93 static canonicalize_fn_t CanonicalizeEntry = NULL; 94 static ZipInflateFully_t ZipInflateFully = NULL; 95 static Crc32_t Crc32 = NULL; 96 97 // Entry points for jimage.dll for loading jimage file entries 98 99 static JImageOpen_t JImageOpen = NULL; 100 static JImageClose_t JImageClose = NULL; 101 static JImagePackageToModule_t JImagePackageToModule = NULL; 102 static JImageFindResource_t JImageFindResource = NULL; 103 static JImageGetResource_t JImageGetResource = NULL; 104 static JImageResourceIterator_t JImageResourceIterator = NULL; 105 static JImage_ResourcePath_t JImageResourcePath = NULL; 106 107 // Globals 108 109 PerfCounter* ClassLoader::_perf_accumulated_time = NULL; 110 PerfCounter* ClassLoader::_perf_classes_inited = NULL; 111 PerfCounter* ClassLoader::_perf_class_init_time = NULL; 112 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL; 113 PerfCounter* ClassLoader::_perf_classes_verified = NULL; 114 PerfCounter* ClassLoader::_perf_class_verify_time = NULL; 115 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL; 116 PerfCounter* ClassLoader::_perf_classes_linked = NULL; 117 PerfCounter* ClassLoader::_perf_class_link_time = NULL; 118 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL; 119 PerfCounter* ClassLoader::_perf_class_parse_time = NULL; 120 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL; 121 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL; 122 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL; 123 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL; 124 PerfCounter* ClassLoader::_perf_app_classload_time = NULL; 125 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL; 126 PerfCounter* ClassLoader::_perf_app_classload_count = NULL; 127 PerfCounter* ClassLoader::_perf_define_appclasses = NULL; 128 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL; 129 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL; 130 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL; 131 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL; 132 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL; 133 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL; 134 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL; 135 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL; 136 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL; 137 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL; 138 139 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL; 140 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL; 141 ClassPathEntry* ClassLoader::_jrt_entry = NULL; 142 ClassPathEntry* ClassLoader::_first_append_entry = NULL; 143 ClassPathEntry* ClassLoader::_last_append_entry = NULL; 144 #if INCLUDE_CDS 145 ClassPathEntry* ClassLoader::_app_classpath_entries = NULL; 146 ClassPathEntry* ClassLoader::_last_app_classpath_entry = NULL; 147 ClassPathEntry* ClassLoader::_module_path_entries = NULL; 148 ClassPathEntry* ClassLoader::_last_module_path_entry = NULL; 149 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL; 150 #endif 151 152 // helper routines 153 bool string_starts_with(const char* str, const char* str_to_find) { 154 size_t str_len = strlen(str); 155 size_t str_to_find_len = strlen(str_to_find); 156 if (str_to_find_len > str_len) { 157 return false; 158 } 159 return (strncmp(str, str_to_find, str_to_find_len) == 0); 160 } 161 162 static const char* get_jimage_version_string() { 163 static char version_string[10] = ""; 164 if (version_string[0] == '\0') { 165 jio_snprintf(version_string, sizeof(version_string), "%d.%d", 166 VM_Version::vm_major_version(), VM_Version::vm_minor_version()); 167 } 168 return (const char*)version_string; 169 } 170 171 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) { 172 size_t str_len = strlen(str); 173 size_t str_to_find_len = strlen(str_to_find); 174 if (str_to_find_len > str_len) { 175 return false; 176 } 177 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0); 178 } 179 180 // Used to obtain the package name from a fully qualified class name. 181 // It is the responsibility of the caller to establish a ResourceMark. 182 const char* ClassLoader::package_from_name(const char* const class_name, bool* bad_class_name) { 183 if (class_name == NULL) { 184 if (bad_class_name != NULL) { 185 *bad_class_name = true; 186 } 187 return NULL; 188 } 189 190 if (bad_class_name != NULL) { 191 *bad_class_name = false; 192 } 193 194 const char* const last_slash = strrchr(class_name, '/'); 195 if (last_slash == NULL) { 196 // No package name 197 return NULL; 198 } 199 200 char* class_name_ptr = (char*) class_name; 201 // Skip over '['s 202 if (*class_name_ptr == '[') { 203 do { 204 class_name_ptr++; 205 } while (*class_name_ptr == '['); 206 207 // Fully qualified class names should not contain a 'L'. 208 // Set bad_class_name to true to indicate that the package name 209 // could not be obtained due to an error condition. 210 // In this situation, is_same_class_package returns false. 211 if (*class_name_ptr == 'L') { 212 if (bad_class_name != NULL) { 213 *bad_class_name = true; 214 } 215 return NULL; 216 } 217 } 218 219 int length = last_slash - class_name_ptr; 220 221 // A class name could have just the slash character in the name. 222 if (length <= 0) { 223 // No package name 224 if (bad_class_name != NULL) { 225 *bad_class_name = true; 226 } 227 return NULL; 228 } 229 230 // drop name after last slash (including slash) 231 // Ex., "java/lang/String.class" => "java/lang" 232 char* pkg_name = NEW_RESOURCE_ARRAY(char, length + 1); 233 strncpy(pkg_name, class_name_ptr, length); 234 *(pkg_name+length) = '\0'; 235 236 return (const char *)pkg_name; 237 } 238 239 // Given a fully qualified class name, find its defining package in the class loader's 240 // package entry table. 241 PackageEntry* ClassLoader::get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS) { 242 ResourceMark rm(THREAD); 243 const char *pkg_name = ClassLoader::package_from_name(class_name); 244 if (pkg_name == NULL) { 245 return NULL; 246 } 247 PackageEntryTable* pkgEntryTable = loader_data->packages(); 248 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(pkg_name, CHECK_NULL); 249 return pkgEntryTable->lookup_only(pkg_symbol); 250 } 251 252 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() { 253 char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass); 254 strcpy(copy, dir); 255 _dir = copy; 256 } 257 258 259 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) { 260 // construct full path name 261 assert((_dir != NULL) && (name != NULL), "sanity"); 262 size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1; 263 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, path_len); 264 int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name); 265 assert(len == (int)(path_len - 1), "sanity"); 266 // check if file exists 267 struct stat st; 268 if (os::stat(path, &st) == 0) { 269 // found file, open it 270 int file_handle = os::open(path, 0, 0); 271 if (file_handle != -1) { 272 // read contents into resource array 273 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size); 274 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size); 275 // close file 276 os::close(file_handle); 277 // construct ClassFileStream 278 if (num_read == (size_t)st.st_size) { 279 if (UsePerfData) { 280 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read); 281 } 282 FREE_RESOURCE_ARRAY(char, path, path_len); 283 // Resource allocated 284 return new ClassFileStream(buffer, 285 st.st_size, 286 _dir, 287 ClassFileStream::verify); 288 } 289 } 290 } 291 FREE_RESOURCE_ARRAY(char, path, path_len); 292 return NULL; 293 } 294 295 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() { 296 _zip = zip; 297 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass); 298 strcpy(copy, zip_name); 299 _zip_name = copy; 300 } 301 302 ClassPathZipEntry::~ClassPathZipEntry() { 303 if (ZipClose != NULL) { 304 (*ZipClose)(_zip); 305 } 306 FREE_C_HEAP_ARRAY(char, _zip_name); 307 } 308 309 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) { 310 // enable call to C land 311 JavaThread* thread = JavaThread::current(); 312 ThreadToNativeFromVM ttn(thread); 313 // check whether zip archive contains name 314 jint name_len; 315 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len); 316 if (entry == NULL) return NULL; 317 u1* buffer; 318 char name_buf[128]; 319 char* filename; 320 if (name_len < 128) { 321 filename = name_buf; 322 } else { 323 filename = NEW_RESOURCE_ARRAY(char, name_len + 1); 324 } 325 326 // read contents into resource array 327 int size = (*filesize) + ((nul_terminate) ? 1 : 0); 328 buffer = NEW_RESOURCE_ARRAY(u1, size); 329 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL; 330 331 // return result 332 if (nul_terminate) { 333 buffer[*filesize] = 0; 334 } 335 return buffer; 336 } 337 338 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) { 339 jint filesize; 340 u1* buffer = open_entry(name, &filesize, false, CHECK_NULL); 341 if (buffer == NULL) { 342 return NULL; 343 } 344 if (UsePerfData) { 345 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize); 346 } 347 // Resource allocated 348 return new ClassFileStream(buffer, 349 filesize, 350 _zip_name, 351 ClassFileStream::verify); 352 } 353 354 // invoke function for each entry in the zip file 355 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) { 356 JavaThread* thread = JavaThread::current(); 357 HandleMark handle_mark(thread); 358 ThreadToNativeFromVM ttn(thread); 359 for (int n = 0; ; n++) { 360 jzentry * ze = ((*GetNextEntry)(_zip, n)); 361 if (ze == NULL) break; 362 (*f)(ze->name, context); 363 } 364 } 365 366 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) : 367 ClassPathEntry(), 368 _jimage(jimage) { 369 guarantee(jimage != NULL, "jimage file is null"); 370 guarantee(name != NULL, "jimage file name is null"); 371 size_t len = strlen(name) + 1; 372 _name = NEW_C_HEAP_ARRAY(const char, len, mtClass); 373 strncpy((char *)_name, name, len); 374 } 375 376 ClassPathImageEntry::~ClassPathImageEntry() { 377 if (_name != NULL) { 378 FREE_C_HEAP_ARRAY(const char, _name); 379 _name = NULL; 380 } 381 if (_jimage != NULL) { 382 (*JImageClose)(_jimage); 383 _jimage = NULL; 384 } 385 } 386 387 // For a class in a named module, look it up in the jimage file using this syntax: 388 // /<module-name>/<package-name>/<base-class> 389 // 390 // Assumptions: 391 // 1. There are no unnamed modules in the jimage file. 392 // 2. A package is in at most one module in the jimage file. 393 // 394 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) { 395 jlong size; 396 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size); 397 398 if (location == 0) { 399 ResourceMark rm; 400 const char* pkg_name = ClassLoader::package_from_name(name); 401 402 if (pkg_name != NULL) { 403 if (!Universe::is_module_initialized()) { 404 location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size); 405 #if INCLUDE_CDS 406 // CDS uses the boot class loader to load classes whose packages are in 407 // modules defined for other class loaders. So, for now, get their module 408 // names from the "modules" jimage file. 409 if (DumpSharedSpaces && location == 0) { 410 const char* module_name = (*JImagePackageToModule)(_jimage, pkg_name); 411 if (module_name != NULL) { 412 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size); 413 } 414 } 415 #endif 416 417 } else { 418 PackageEntry* package_entry = ClassLoader::get_package_entry(name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL); 419 if (package_entry != NULL) { 420 ResourceMark rm; 421 // Get the module name 422 ModuleEntry* module = package_entry->module(); 423 assert(module != NULL, "Boot classLoader package missing module"); 424 assert(module->is_named(), "Boot classLoader package is in unnamed module"); 425 const char* module_name = module->name()->as_C_string(); 426 if (module_name != NULL) { 427 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size); 428 } 429 } 430 } 431 } 432 } 433 if (location != 0) { 434 if (UsePerfData) { 435 ClassLoader::perf_sys_classfile_bytes_read()->inc(size); 436 } 437 char* data = NEW_RESOURCE_ARRAY(char, size); 438 (*JImageGetResource)(_jimage, location, data, size); 439 // Resource allocated 440 return new ClassFileStream((u1*)data, 441 (int)size, 442 _name, 443 ClassFileStream::verify); 444 } 445 446 return NULL; 447 } 448 449 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf, 450 const char* module_name, 451 const char* file_name, 452 jlong &size) { 453 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size)); 454 } 455 456 #ifndef PRODUCT 457 bool ctw_visitor(JImageFile* jimage, 458 const char* module_name, const char* version, const char* package, 459 const char* name, const char* extension, void* arg) { 460 if (strcmp(extension, "class") == 0) { 461 Thread* THREAD = Thread::current(); 462 ResourceMark rm(THREAD); 463 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JIMAGE_MAX_PATH); 464 jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name); 465 ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD); 466 return !HAS_PENDING_EXCEPTION; 467 } 468 return true; 469 } 470 471 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) { 472 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name()); 473 tty->cr(); 474 (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader); 475 if (HAS_PENDING_EXCEPTION) { 476 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 477 CLEAR_PENDING_EXCEPTION; 478 tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); 479 tty->print_cr("Increase class metadata storage if a limit was set"); 480 } else { 481 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); 482 } 483 } 484 } 485 #endif 486 487 bool ClassPathImageEntry::is_modules_image() const { 488 return ClassLoader::is_modules_image(name()); 489 } 490 491 #if INCLUDE_CDS 492 void ClassLoader::exit_with_path_failure(const char* error, const char* message) { 493 assert(DumpSharedSpaces, "only called at dump time"); 494 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure"); 495 vm_exit_during_initialization(error, message); 496 } 497 #endif 498 499 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) { 500 _module_name = module_name; 501 _module_first_entry = NULL; 502 _module_last_entry = NULL; 503 } 504 505 ModuleClassPathList::~ModuleClassPathList() { 506 // Clean out each ClassPathEntry on list 507 ClassPathEntry* e = _module_first_entry; 508 while (e != NULL) { 509 ClassPathEntry* next_entry = e->next(); 510 delete e; 511 e = next_entry; 512 } 513 } 514 515 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) { 516 if (new_entry != NULL) { 517 if (_module_last_entry == NULL) { 518 _module_first_entry = _module_last_entry = new_entry; 519 } else { 520 _module_last_entry->set_next(new_entry); 521 _module_last_entry = new_entry; 522 } 523 } 524 } 525 526 void ClassLoader::trace_class_path(const char* msg, const char* name) { 527 LogTarget(Info, class, path) lt; 528 if (lt.is_enabled()) { 529 LogStream ls(lt); 530 if (msg) { 531 ls.print("%s", msg); 532 } 533 if (name) { 534 if (strlen(name) < 256) { 535 ls.print("%s", name); 536 } else { 537 // For very long paths, we need to print each character separately, 538 // as print_cr() has a length limit 539 while (name[0] != '\0') { 540 ls.print("%c", name[0]); 541 name++; 542 } 543 } 544 } 545 ls.cr(); 546 } 547 } 548 549 void ClassLoader::setup_bootstrap_search_path() { 550 const char* sys_class_path = Arguments::get_sysclasspath(); 551 assert(sys_class_path != NULL, "System boot class path must not be NULL"); 552 if (PrintSharedArchiveAndExit) { 553 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily 554 // the same as the bootcp of the shared archive. 555 } else { 556 trace_class_path("bootstrap loader class path=", sys_class_path); 557 } 558 #if INCLUDE_CDS 559 if (DumpSharedSpaces) { 560 _shared_paths_misc_info->add_boot_classpath(sys_class_path); 561 } 562 #endif 563 setup_boot_search_path(sys_class_path); 564 } 565 566 #if INCLUDE_CDS 567 int ClassLoader::get_shared_paths_misc_info_size() { 568 return _shared_paths_misc_info->get_used_bytes(); 569 } 570 571 void* ClassLoader::get_shared_paths_misc_info() { 572 return _shared_paths_misc_info->buffer(); 573 } 574 575 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) { 576 SharedPathsMiscInfo* checker = new SharedPathsMiscInfo((char*)buf, size); 577 bool result = checker->check(); 578 delete checker; 579 return result; 580 } 581 582 void ClassLoader::setup_app_search_path(const char *class_path) { 583 584 assert(DumpSharedSpaces, "Sanity"); 585 586 Thread* THREAD = Thread::current(); 587 int len = (int)strlen(class_path); 588 int end = 0; 589 590 // Iterate over class path entries 591 for (int start = 0; start < len; start = end) { 592 while (class_path[end] && class_path[end] != os::path_separator()[0]) { 593 end++; 594 } 595 EXCEPTION_MARK; 596 ResourceMark rm(THREAD); 597 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1); 598 strncpy(path, &class_path[start], end - start); 599 path[end - start] = '\0'; 600 601 update_class_path_entry_list(path, false, false); 602 603 while (class_path[end] == os::path_separator()[0]) { 604 end++; 605 } 606 } 607 } 608 609 void ClassLoader::add_to_module_path_entries(const char* path, 610 ClassPathEntry* entry) { 611 assert(entry != NULL, "ClassPathEntry should not be NULL"); 612 assert(DumpSharedSpaces, "dump time only"); 613 614 // The entry does not exist, add to the list 615 if (_module_path_entries == NULL) { 616 assert(_last_module_path_entry == NULL, "Sanity"); 617 _module_path_entries = _last_module_path_entry = entry; 618 } else { 619 _last_module_path_entry->set_next(entry); 620 _last_module_path_entry = entry; 621 } 622 } 623 624 // Add a module path to the _module_path_entries list. 625 void ClassLoader::update_module_path_entry_list(const char *path, TRAPS) { 626 assert(DumpSharedSpaces, "dump time only"); 627 struct stat st; 628 if (os::stat(path, &st) != 0) { 629 tty->print_cr("os::stat error %d (%s). CDS dump aborted (path was \"%s\").", 630 errno, os::errno_name(errno), path); 631 vm_exit_during_initialization(); 632 } 633 // File or directory found 634 ClassPathEntry* new_entry = NULL; 635 new_entry = create_class_path_entry(path, &st, true /* throw_exception */, 636 false /*is_boot_append */, CHECK); 637 if (new_entry == NULL) { 638 return; 639 } 640 641 add_to_module_path_entries(path, new_entry); 642 return; 643 } 644 645 void ClassLoader::setup_module_search_path(const char* path, TRAPS) { 646 update_module_path_entry_list(path, THREAD); 647 } 648 #endif // INCLUDE_CDS 649 650 // Construct the array of module/path pairs as specified to --patch-module 651 // for the boot loader to search ahead of the jimage, if the class being 652 // loaded is defined to a module that has been specified to --patch-module. 653 void ClassLoader::setup_patch_mod_entries() { 654 Thread* THREAD = Thread::current(); 655 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix(); 656 int num_of_entries = patch_mod_args->length(); 657 658 659 // Set up the boot loader's _patch_mod_entries list 660 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true); 661 662 for (int i = 0; i < num_of_entries; i++) { 663 const char* module_name = (patch_mod_args->at(i))->module_name(); 664 Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK); 665 assert(module_sym != NULL, "Failed to obtain Symbol for module name"); 666 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym); 667 668 char* class_path = (patch_mod_args->at(i))->path_string(); 669 int len = (int)strlen(class_path); 670 int end = 0; 671 // Iterate over the module's class path entries 672 for (int start = 0; start < len; start = end) { 673 while (class_path[end] && class_path[end] != os::path_separator()[0]) { 674 end++; 675 } 676 EXCEPTION_MARK; 677 ResourceMark rm(THREAD); 678 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1); 679 strncpy(path, &class_path[start], end - start); 680 path[end - start] = '\0'; 681 682 struct stat st; 683 if (os::stat(path, &st) == 0) { 684 // File or directory found 685 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK); 686 // If the path specification is valid, enter it into this module's list 687 if (new_entry != NULL) { 688 module_cpl->add_to_list(new_entry); 689 } 690 } 691 692 while (class_path[end] == os::path_separator()[0]) { 693 end++; 694 } 695 } 696 697 // Record the module into the list of --patch-module entries only if 698 // valid ClassPathEntrys have been created 699 if (module_cpl->module_first_entry() != NULL) { 700 _patch_mod_entries->push(module_cpl); 701 } 702 } 703 } 704 705 // Determine whether the module has been patched via the command-line 706 // option --patch-module 707 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) { 708 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) { 709 int table_len = _patch_mod_entries->length(); 710 for (int i = 0; i < table_len; i++) { 711 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i); 712 if (module_name->fast_compare(patch_mod->module_name()) == 0) { 713 return true; 714 } 715 } 716 } 717 return false; 718 } 719 720 // Set up the _jrt_entry if present and boot append path 721 void ClassLoader::setup_boot_search_path(const char *class_path) { 722 int len = (int)strlen(class_path); 723 int end = 0; 724 bool set_base_piece = true; 725 726 #if INCLUDE_CDS 727 if (DumpSharedSpaces) { 728 if (!Arguments::has_jimage()) { 729 vm_exit_during_initialization("CDS is not supported in exploded JDK build", NULL); 730 } 731 } 732 #endif 733 734 // Iterate over class path entries 735 for (int start = 0; start < len; start = end) { 736 while (class_path[end] && class_path[end] != os::path_separator()[0]) { 737 end++; 738 } 739 EXCEPTION_MARK; 740 ResourceMark rm(THREAD); 741 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1); 742 strncpy(path, &class_path[start], end - start); 743 path[end - start] = '\0'; 744 745 if (set_base_piece) { 746 // The first time through the bootstrap_search setup, it must be determined 747 // what the base or core piece of the boot loader search is. Either a java runtime 748 // image is present or this is an exploded module build situation. 749 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME), 750 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build"); 751 struct stat st; 752 if (os::stat(path, &st) == 0) { 753 // Directory found 754 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK); 755 756 // Check for a jimage 757 if (Arguments::has_jimage()) { 758 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice"); 759 assert(new_entry != NULL && new_entry->is_modules_image(), "No java runtime image present"); 760 _jrt_entry = new_entry; 761 assert(_jrt_entry->jimage() != NULL, "No java runtime image"); 762 } 763 } else { 764 // If path does not exist, exit 765 vm_exit_during_initialization("Unable to establish the boot loader search path", path); 766 } 767 set_base_piece = false; 768 } else { 769 // Every entry on the system boot class path after the initial base piece, 770 // which is set by os::set_boot_path(), is considered an appended entry. 771 update_class_path_entry_list(path, false, true); 772 } 773 774 while (class_path[end] == os::path_separator()[0]) { 775 end++; 776 } 777 } 778 } 779 780 // During an exploded modules build, each module defined to the boot loader 781 // will be added to the ClassLoader::_exploded_entries array. 782 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) { 783 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable"); 784 assert(_exploded_entries != NULL, "_exploded_entries was not initialized"); 785 786 // Find the module's symbol 787 ResourceMark rm(THREAD); 788 const char *module_name = module_sym->as_C_string(); 789 const char *home = Arguments::get_java_home(); 790 const char file_sep = os::file_separator()[0]; 791 // 10 represents the length of "modules" + 2 file separators + \0 792 size_t len = strlen(home) + strlen(module_name) + 10; 793 char *path = NEW_RESOURCE_ARRAY(char, len); 794 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name); 795 796 struct stat st; 797 if (os::stat(path, &st) == 0) { 798 // Directory found 799 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK); 800 801 // If the path specification is valid, enter it into this module's list. 802 // There is no need to check for duplicate modules in the exploded entry list, 803 // since no two modules with the same name can be defined to the boot loader. 804 // This is checked at module definition time in Modules::define_module. 805 if (new_entry != NULL) { 806 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym); 807 module_cpl->add_to_list(new_entry); 808 { 809 MutexLocker ml(Module_lock, THREAD); 810 _exploded_entries->push(module_cpl); 811 } 812 log_info(class, load)("path: %s", path); 813 } 814 } 815 } 816 817 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st, 818 bool throw_exception, 819 bool is_boot_append, TRAPS) { 820 JavaThread* thread = JavaThread::current(); 821 ClassPathEntry* new_entry = NULL; 822 if ((st->st_mode & S_IFMT) == S_IFREG) { 823 ResourceMark rm(thread); 824 // Regular file, should be a zip or jimage file 825 // Canonicalized filename 826 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN); 827 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 828 // This matches the classic VM 829 if (throw_exception) { 830 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL); 831 } else { 832 return NULL; 833 } 834 } 835 jint error; 836 JImageFile* jimage =(*JImageOpen)(canonical_path, &error); 837 if (jimage != NULL) { 838 new_entry = new ClassPathImageEntry(jimage, canonical_path); 839 } else { 840 char* error_msg = NULL; 841 jzfile* zip; 842 { 843 // enable call to C land 844 ThreadToNativeFromVM ttn(thread); 845 HandleMark hm(thread); 846 zip = (*ZipOpen)(canonical_path, &error_msg); 847 } 848 if (zip != NULL && error_msg == NULL) { 849 new_entry = new ClassPathZipEntry(zip, path, is_boot_append); 850 } else { 851 char *msg; 852 if (error_msg == NULL) { 853 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ; 854 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path); 855 } else { 856 int len = (int)(strlen(path) + strlen(error_msg) + 128); 857 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ; 858 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path); 859 } 860 // Don't complain about bad jar files added via -Xbootclasspath/a:. 861 if (throw_exception && is_init_completed()) { 862 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL); 863 } else { 864 return NULL; 865 } 866 } 867 } 868 log_info(class, path)("opened: %s", path); 869 log_info(class, load)("opened: %s", path); 870 } else { 871 // Directory 872 new_entry = new ClassPathDirEntry(path); 873 log_info(class, load)("path: %s", path); 874 } 875 return new_entry; 876 } 877 878 879 // Create a class path zip entry for a given path (return NULL if not found 880 // or zip/JAR file cannot be opened) 881 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) { 882 // check for a regular file 883 struct stat st; 884 if (os::stat(path, &st) == 0) { 885 if ((st.st_mode & S_IFMT) == S_IFREG) { 886 char canonical_path[JVM_MAXPATHLEN]; 887 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 888 char* error_msg = NULL; 889 jzfile* zip; 890 { 891 // enable call to C land 892 JavaThread* thread = JavaThread::current(); 893 ThreadToNativeFromVM ttn(thread); 894 HandleMark hm(thread); 895 zip = (*ZipOpen)(canonical_path, &error_msg); 896 } 897 if (zip != NULL && error_msg == NULL) { 898 // create using canonical path 899 return new ClassPathZipEntry(zip, canonical_path, is_boot_append); 900 } 901 } 902 } 903 } 904 return NULL; 905 } 906 907 // returns true if entry already on class path 908 bool ClassLoader::contains_append_entry(const char* name) { 909 ClassPathEntry* e = _first_append_entry; 910 while (e != NULL) { 911 // assume zip entries have been canonicalized 912 if (strcmp(name, e->name()) == 0) { 913 return true; 914 } 915 e = e->next(); 916 } 917 return false; 918 } 919 920 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) { 921 if (new_entry != NULL) { 922 if (_last_append_entry == NULL) { 923 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty"); 924 _first_append_entry = _last_append_entry = new_entry; 925 } else { 926 _last_append_entry->set_next(new_entry); 927 _last_append_entry = new_entry; 928 } 929 } 930 } 931 932 // Record the path entries specified in -cp during dump time. The recorded 933 // information will be used at runtime for loading the archived app classes. 934 // 935 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for 936 // loading app classes. Instead, the app class are loaded by the 937 // jdk/internal/loader/ClassLoaders$AppClassLoader instance. 938 void ClassLoader::add_to_app_classpath_entries(const char* path, 939 ClassPathEntry* entry, 940 bool check_for_duplicates) { 941 #if INCLUDE_CDS 942 assert(entry != NULL, "ClassPathEntry should not be NULL"); 943 ClassPathEntry* e = _app_classpath_entries; 944 if (check_for_duplicates) { 945 while (e != NULL) { 946 if (strcmp(e->name(), entry->name()) == 0) { 947 // entry already exists 948 return; 949 } 950 e = e->next(); 951 } 952 } 953 954 // The entry does not exist, add to the list 955 if (_app_classpath_entries == NULL) { 956 assert(_last_app_classpath_entry == NULL, "Sanity"); 957 _app_classpath_entries = _last_app_classpath_entry = entry; 958 } else { 959 _last_app_classpath_entry->set_next(entry); 960 _last_app_classpath_entry = entry; 961 } 962 963 if (entry->is_jar_file()) { 964 ClassLoaderExt::process_jar_manifest(entry, check_for_duplicates); 965 } 966 #endif 967 } 968 969 // Returns true IFF the file/dir exists and the entry was successfully created. 970 bool ClassLoader::update_class_path_entry_list(const char *path, 971 bool check_for_duplicates, 972 bool is_boot_append, 973 bool throw_exception) { 974 struct stat st; 975 if (os::stat(path, &st) == 0) { 976 // File or directory found 977 ClassPathEntry* new_entry = NULL; 978 Thread* THREAD = Thread::current(); 979 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false)); 980 if (new_entry == NULL) { 981 return false; 982 } 983 984 // Do not reorder the bootclasspath which would break get_system_package(). 985 // Add new entry to linked list 986 if (is_boot_append) { 987 add_to_boot_append_entries(new_entry); 988 } else { 989 add_to_app_classpath_entries(path, new_entry, check_for_duplicates); 990 } 991 return true; 992 } else { 993 #if INCLUDE_CDS 994 if (DumpSharedSpaces) { 995 _shared_paths_misc_info->add_nonexist_path(path); 996 } 997 #endif 998 return false; 999 } 1000 } 1001 1002 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) { 1003 ResourceMark rm; 1004 int num_of_entries = module_list->length(); 1005 for (int i = 0; i < num_of_entries; i++) { 1006 ClassPathEntry* e; 1007 ModuleClassPathList* mpl = module_list->at(i); 1008 tty->print("%s=", mpl->module_name()->as_C_string()); 1009 e = mpl->module_first_entry(); 1010 while (e != NULL) { 1011 tty->print("%s", e->name()); 1012 e = e->next(); 1013 if (e != NULL) { 1014 tty->print("%s", os::path_separator()); 1015 } 1016 } 1017 tty->print(" ;"); 1018 } 1019 } 1020 1021 void ClassLoader::print_bootclasspath() { 1022 ClassPathEntry* e; 1023 tty->print("[bootclasspath= "); 1024 1025 // Print --patch-module module/path specifications first 1026 if (_patch_mod_entries != NULL) { 1027 print_module_entry_table(_patch_mod_entries); 1028 } 1029 1030 // [jimage | exploded modules build] 1031 if (has_jrt_entry()) { 1032 // Print the location of the java runtime image 1033 tty->print("%s ;", _jrt_entry->name()); 1034 } else { 1035 // Print exploded module build path specifications 1036 if (_exploded_entries != NULL) { 1037 print_module_entry_table(_exploded_entries); 1038 } 1039 } 1040 1041 // appended entries 1042 e = _first_append_entry; 1043 while (e != NULL) { 1044 tty->print("%s ;", e->name()); 1045 e = e->next(); 1046 } 1047 tty->print_cr("]"); 1048 } 1049 1050 void ClassLoader::load_zip_library() { 1051 assert(ZipOpen == NULL, "should not load zip library twice"); 1052 // First make sure native library is loaded 1053 os::native_java_library(); 1054 // Load zip library 1055 char path[JVM_MAXPATHLEN]; 1056 char ebuf[1024]; 1057 void* handle = NULL; 1058 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) { 1059 handle = os::dll_load(path, ebuf, sizeof ebuf); 1060 } 1061 if (handle == NULL) { 1062 vm_exit_during_initialization("Unable to load ZIP library", path); 1063 } 1064 // Lookup zip entry points 1065 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open")); 1066 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close")); 1067 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry")); 1068 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry")); 1069 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry")); 1070 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully")); 1071 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32")); 1072 1073 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL 1074 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL || 1075 GetNextEntry == NULL || Crc32 == NULL) { 1076 vm_exit_during_initialization("Corrupted ZIP library", path); 1077 } 1078 1079 if (ZipInflateFully == NULL) { 1080 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path); 1081 } 1082 1083 // Lookup canonicalize entry in libjava.dll 1084 void *javalib_handle = os::native_java_library(); 1085 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize")); 1086 // This lookup only works on 1.3. Do not check for non-null here 1087 } 1088 1089 void ClassLoader::load_jimage_library() { 1090 // First make sure native library is loaded 1091 os::native_java_library(); 1092 // Load jimage library 1093 char path[JVM_MAXPATHLEN]; 1094 char ebuf[1024]; 1095 void* handle = NULL; 1096 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) { 1097 handle = os::dll_load(path, ebuf, sizeof ebuf); 1098 } 1099 if (handle == NULL) { 1100 vm_exit_during_initialization("Unable to load jimage library", path); 1101 } 1102 1103 // Lookup jimage entry points 1104 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open")); 1105 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found"); 1106 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close")); 1107 guarantee(JImageClose != NULL, "function JIMAGE_Close not found"); 1108 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule")); 1109 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found"); 1110 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource")); 1111 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found"); 1112 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource")); 1113 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found"); 1114 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator")); 1115 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found"); 1116 JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath")); 1117 guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found"); 1118 } 1119 1120 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) { 1121 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg); 1122 } 1123 1124 int ClassLoader::crc32(int crc, const char* buf, int len) { 1125 assert(Crc32 != NULL, "ZIP_CRC32 is not found"); 1126 return (*Crc32)(crc, (const jbyte*)buf, len); 1127 } 1128 1129 // Function add_package extracts the package from the fully qualified class name 1130 // and checks if the package is in the boot loader's package entry table. If so, 1131 // then it sets the classpath_index in the package entry record. 1132 // 1133 // The classpath_index field is used to find the entry on the boot loader class 1134 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a 1135 // in an unnamed module. It is also used to indicate (for all packages whose 1136 // classes are loaded by the boot loader) that at least one of the package's 1137 // classes has been loaded. 1138 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) { 1139 assert(fullq_class_name != NULL, "just checking"); 1140 1141 // Get package name from fully qualified class name. 1142 ResourceMark rm; 1143 const char *cp = package_from_name(fullq_class_name); 1144 if (cp != NULL) { 1145 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages(); 1146 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false); 1147 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol); 1148 if (pkg_entry != NULL) { 1149 assert(classpath_index != -1, "Unexpected classpath_index"); 1150 pkg_entry->set_classpath_index(classpath_index); 1151 } else { 1152 return false; 1153 } 1154 } 1155 return true; 1156 } 1157 1158 oop ClassLoader::get_system_package(const char* name, TRAPS) { 1159 // Look up the name in the boot loader's package entry table. 1160 if (name != NULL) { 1161 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL); 1162 // Look for the package entry in the boot loader's package entry table. 1163 PackageEntry* package = 1164 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym); 1165 1166 // Return NULL if package does not exist or if no classes in that package 1167 // have been loaded. 1168 if (package != NULL && package->has_loaded_class()) { 1169 ModuleEntry* module = package->module(); 1170 if (module->location() != NULL) { 1171 ResourceMark rm(THREAD); 1172 Handle ml = java_lang_String::create_from_str( 1173 module->location()->as_C_string(), THREAD); 1174 return ml(); 1175 } 1176 // Return entry on boot loader class path. 1177 Handle cph = java_lang_String::create_from_str( 1178 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD); 1179 return cph(); 1180 } 1181 } 1182 return NULL; 1183 } 1184 1185 objArrayOop ClassLoader::get_system_packages(TRAPS) { 1186 ResourceMark rm(THREAD); 1187 // List of pointers to PackageEntrys that have loaded classes. 1188 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50); 1189 { 1190 MutexLocker ml(Module_lock, THREAD); 1191 1192 PackageEntryTable* pe_table = 1193 ClassLoaderData::the_null_class_loader_data()->packages(); 1194 1195 // Collect the packages that have at least one loaded class. 1196 for (int x = 0; x < pe_table->table_size(); x++) { 1197 for (PackageEntry* package_entry = pe_table->bucket(x); 1198 package_entry != NULL; 1199 package_entry = package_entry->next()) { 1200 if (package_entry->has_loaded_class()) { 1201 loaded_class_pkgs->append(package_entry); 1202 } 1203 } 1204 } 1205 } 1206 1207 1208 // Allocate objArray and fill with java.lang.String 1209 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), 1210 loaded_class_pkgs->length(), CHECK_NULL); 1211 objArrayHandle result(THREAD, r); 1212 for (int x = 0; x < loaded_class_pkgs->length(); x++) { 1213 PackageEntry* package_entry = loaded_class_pkgs->at(x); 1214 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL); 1215 result->obj_at_put(x, str()); 1216 } 1217 return result(); 1218 } 1219 1220 // caller needs ResourceMark 1221 const char* ClassLoader::file_name_for_class_name(const char* class_name, 1222 int class_name_len) { 1223 assert(class_name != NULL, "invariant"); 1224 assert((int)strlen(class_name) == class_name_len, "invariant"); 1225 1226 static const char class_suffix[] = ".class"; 1227 1228 char* const file_name = NEW_RESOURCE_ARRAY(char, 1229 class_name_len + 1230 sizeof(class_suffix)); // includes term NULL 1231 1232 strncpy(file_name, class_name, class_name_len); 1233 strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix)); 1234 1235 return file_name; 1236 } 1237 1238 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry, 1239 const GrowableArray<ModuleClassPathList*>* const module_list) { 1240 int num_of_entries = module_list->length(); 1241 const Symbol* class_module_name = mod_entry->name(); 1242 1243 // Loop through all the modules in either the patch-module or exploded entries looking for module 1244 for (int i = 0; i < num_of_entries; i++) { 1245 ModuleClassPathList* module_cpl = module_list->at(i); 1246 Symbol* module_cpl_name = module_cpl->module_name(); 1247 1248 if (module_cpl_name->fast_compare(class_module_name) == 0) { 1249 // Class' module has been located. 1250 return module_cpl->module_first_entry(); 1251 } 1252 } 1253 return NULL; 1254 } 1255 1256 1257 // Search either the patch-module or exploded build entries for class. 1258 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list, 1259 const char* const class_name, 1260 const char* const file_name, 1261 TRAPS) { 1262 ClassFileStream* stream = NULL; 1263 1264 // Find the class' defining module in the boot loader's module entry table 1265 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL); 1266 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL; 1267 1268 // If the module system has not defined java.base yet, then 1269 // classes loaded are assumed to be defined to java.base. 1270 // When java.base is eventually defined by the module system, 1271 // all packages of classes that have been previously loaded 1272 // are verified in ModuleEntryTable::verify_javabase_packages(). 1273 if (!Universe::is_module_initialized() && 1274 !ModuleEntryTable::javabase_defined() && 1275 mod_entry == NULL) { 1276 mod_entry = ModuleEntryTable::javabase_moduleEntry(); 1277 } 1278 1279 // The module must be a named module 1280 ClassPathEntry* e = NULL; 1281 if (mod_entry != NULL && mod_entry->is_named()) { 1282 if (module_list == _exploded_entries) { 1283 // The exploded build entries can be added to at any time so a lock is 1284 // needed when searching them. 1285 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build"); 1286 MutexLocker ml(Module_lock, THREAD); 1287 e = find_first_module_cpe(mod_entry, module_list); 1288 } else { 1289 e = find_first_module_cpe(mod_entry, module_list); 1290 } 1291 } 1292 1293 // Try to load the class from the module's ClassPathEntry list. 1294 while (e != NULL) { 1295 stream = e->open_stream(file_name, CHECK_NULL); 1296 // No context.check is required since CDS is not supported 1297 // for an exploded modules build or if --patch-module is specified. 1298 if (NULL != stream) { 1299 return stream; 1300 } 1301 e = e->next(); 1302 } 1303 // If the module was located, break out even if the class was not 1304 // located successfully from that module's ClassPathEntry list. 1305 // There will not be another valid entry for that module. 1306 return NULL; 1307 } 1308 1309 // Called by the boot classloader to load classes 1310 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) { 1311 assert(name != NULL, "invariant"); 1312 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 1313 1314 ResourceMark rm(THREAD); 1315 HandleMark hm(THREAD); 1316 1317 const char* const class_name = name->as_C_string(); 1318 1319 EventMark m("loading class %s", class_name); 1320 1321 const char* const file_name = file_name_for_class_name(class_name, 1322 name->utf8_length()); 1323 assert(file_name != NULL, "invariant"); 1324 1325 // Lookup stream for parsing .class file 1326 ClassFileStream* stream = NULL; 1327 s2 classpath_index = 0; 1328 ClassPathEntry* e = NULL; 1329 1330 // If search_append_only is true, boot loader visibility boundaries are 1331 // set to be _first_append_entry to the end. This includes: 1332 // [-Xbootclasspath/a]; [jvmti appended entries] 1333 // 1334 // If search_append_only is false, boot loader visibility boundaries are 1335 // set to be the --patch-module entries plus the base piece. This includes: 1336 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build] 1337 // 1338 1339 // Load Attempt #1: --patch-module 1340 // Determine the class' defining module. If it appears in the _patch_mod_entries, 1341 // attempt to load the class from those locations specific to the module. 1342 // Specifications to --patch-module can contain a partial number of classes 1343 // that are part of the overall module definition. So if a particular class is not 1344 // found within its module specification, the search should continue to Load Attempt #2. 1345 // Note: The --patch-module entries are never searched if the boot loader's 1346 // visibility boundary is limited to only searching the append entries. 1347 if (_patch_mod_entries != NULL && !search_append_only) { 1348 // At CDS dump time, the --patch-module entries are ignored. That means a 1349 // class is still loaded from the runtime image even if it might 1350 // appear in the _patch_mod_entries. The runtime shared class visibility 1351 // check will determine if a shared class is visible based on the runtime 1352 // environemnt, including the runtime --patch-module setting. 1353 if (!DumpSharedSpaces) { 1354 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL); 1355 } 1356 } 1357 1358 // Load Attempt #2: [jimage | exploded build] 1359 if (!search_append_only && (NULL == stream)) { 1360 if (has_jrt_entry()) { 1361 e = _jrt_entry; 1362 stream = _jrt_entry->open_stream(file_name, CHECK_NULL); 1363 } else { 1364 // Exploded build - attempt to locate class in its defining module's location. 1365 assert(_exploded_entries != NULL, "No exploded build entries present"); 1366 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL); 1367 } 1368 } 1369 1370 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries] 1371 if (search_append_only && (NULL == stream)) { 1372 // For the boot loader append path search, the starting classpath_index 1373 // for the appended piece is always 1 to account for either the 1374 // _jrt_entry or the _exploded_entries. 1375 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly"); 1376 classpath_index = 1; 1377 1378 e = _first_append_entry; 1379 while (e != NULL) { 1380 stream = e->open_stream(file_name, CHECK_NULL); 1381 if (NULL != stream) { 1382 break; 1383 } 1384 e = e->next(); 1385 ++classpath_index; 1386 } 1387 } 1388 1389 if (NULL == stream) { 1390 return NULL; 1391 } 1392 1393 stream->set_verify(ClassLoaderExt::should_verify(classpath_index)); 1394 1395 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 1396 Handle protection_domain; 1397 1398 InstanceKlass* result = KlassFactory::create_from_stream(stream, 1399 name, 1400 loader_data, 1401 protection_domain, 1402 NULL, // unsafe_anonymous_host 1403 NULL, // cp_patches 1404 THREAD); 1405 if (HAS_PENDING_EXCEPTION) { 1406 if (DumpSharedSpaces) { 1407 tty->print_cr("Preload Error: Failed to load %s", class_name); 1408 } 1409 return NULL; 1410 } 1411 1412 if (!add_package(file_name, classpath_index, THREAD)) { 1413 return NULL; 1414 } 1415 1416 return result; 1417 } 1418 1419 #if INCLUDE_CDS 1420 char* ClassLoader::skip_uri_protocol(char* source) { 1421 if (strncmp(source, "file:", 5) == 0) { 1422 // file: protocol path could start with file:/ or file:/// 1423 // locate the char after all the forward slashes 1424 int offset = 5; 1425 while (*(source + offset) == '/') { 1426 offset++; 1427 } 1428 source += offset; 1429 // for non-windows platforms, move back one char as the path begins with a '/' 1430 #ifndef _WINDOWS 1431 source -= 1; 1432 #endif 1433 } else if (strncmp(source, "jrt:/", 5) == 0) { 1434 source += 5; 1435 } 1436 return source; 1437 } 1438 1439 // Record the shared classpath index and loader type for classes loaded 1440 // by the builtin loaders at dump time. 1441 void ClassLoader::record_result(InstanceKlass* ik, const ClassFileStream* stream, TRAPS) { 1442 assert(DumpSharedSpaces, "sanity"); 1443 assert(stream != NULL, "sanity"); 1444 1445 if (ik->is_unsafe_anonymous()) { 1446 // We do not archive unsafe anonymous classes. 1447 return; 1448 } 1449 1450 oop loader = ik->class_loader(); 1451 char* src = (char*)stream->source(); 1452 if (src == NULL) { 1453 if (loader == NULL) { 1454 // JFR classes 1455 ik->set_shared_classpath_index(0); 1456 ik->set_class_loader_type(ClassLoader::BOOT_LOADER); 1457 } 1458 return; 1459 } 1460 1461 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build"); 1462 1463 ResourceMark rm(THREAD); 1464 int classpath_index = -1; 1465 PackageEntry* pkg_entry = ik->package(); 1466 1467 if (FileMapInfo::get_number_of_shared_paths() > 0) { 1468 char* canonical_path_table_entry = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN); 1469 1470 // save the path from the file: protocol or the module name from the jrt: protocol 1471 // if no protocol prefix is found, path is the same as stream->source() 1472 char* path = skip_uri_protocol(src); 1473 char* canonical_class_src_path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN); 1474 bool path_stat = get_canonical_path(path, canonical_class_src_path, JVM_MAXPATHLEN); 1475 assert(path_stat, "Bad src path"); 1476 for (int i = 0; i < FileMapInfo::get_number_of_shared_paths(); i++) { 1477 SharedClassPathEntry* ent = FileMapInfo::shared_path(i); 1478 path_stat = get_canonical_path(ent->name(), canonical_path_table_entry, JVM_MAXPATHLEN); 1479 assert(path_stat, "Bad shared path"); 1480 // If the path (from the class stream source) is the same as the shared 1481 // class or module path, then we have a match. 1482 if (strcmp(canonical_path_table_entry, canonical_class_src_path) == 0) { 1483 // NULL pkg_entry and pkg_entry in an unnamed module implies the class 1484 // is from the -cp or boot loader append path which consists of -Xbootclasspath/a 1485 // and jvmti appended entries. 1486 if ((pkg_entry == NULL) || (pkg_entry->in_unnamed_module())) { 1487 // Ensure the index is within the -cp range before assigning 1488 // to the classpath_index. 1489 if (SystemDictionary::is_system_class_loader(loader) && 1490 (i >= ClassLoaderExt::app_class_paths_start_index()) && 1491 (i < ClassLoaderExt::app_module_paths_start_index())) { 1492 classpath_index = i; 1493 break; 1494 } else { 1495 if ((i >= 1) && 1496 (i < ClassLoaderExt::app_class_paths_start_index())) { 1497 // The class must be from boot loader append path which consists of 1498 // -Xbootclasspath/a and jvmti appended entries. 1499 assert(loader == NULL, "sanity"); 1500 classpath_index = i; 1501 break; 1502 } 1503 } 1504 } else { 1505 // A class from a named module from the --module-path. Ensure the index is 1506 // within the --module-path range before assigning to the classpath_index. 1507 if ((pkg_entry != NULL) && !(pkg_entry->in_unnamed_module()) && (i > 0)) { 1508 if (i >= ClassLoaderExt::app_module_paths_start_index() && 1509 i < FileMapInfo::get_number_of_shared_paths()) { 1510 classpath_index = i; 1511 break; 1512 } 1513 } 1514 } 1515 } 1516 // for index 0 and the stream->source() is the modules image or has the jrt: protocol. 1517 // The class must be from the runtime modules image. 1518 if (i == 0 && (is_modules_image(src) || string_starts_with(src, "jrt:"))) { 1519 classpath_index = i; 1520 break; 1521 } 1522 } 1523 1524 // No path entry found for this class. Must be a shared class loaded by the 1525 // user defined classloader. 1526 if (classpath_index < 0) { 1527 assert(ik->shared_classpath_index() < 0, "Sanity"); 1528 return; 1529 } 1530 } else { 1531 // The shared path table is set up after module system initialization. 1532 // The path table contains no entry before that. Any classes loaded prior 1533 // to the setup of the shared path table must be from the modules image. 1534 assert(is_modules_image(src), "stream must be from modules image"); 1535 assert(FileMapInfo::get_number_of_shared_paths() == 0, "shared path table must not have been setup"); 1536 classpath_index = 0; 1537 } 1538 1539 const char* const class_name = ik->name()->as_C_string(); 1540 const char* const file_name = file_name_for_class_name(class_name, 1541 ik->name()->utf8_length()); 1542 assert(file_name != NULL, "invariant"); 1543 1544 ClassLoaderExt::record_result(classpath_index, ik, THREAD); 1545 } 1546 #endif // INCLUDE_CDS 1547 1548 // Initialize the class loader's access to methods in libzip. Parse and 1549 // process the boot classpath into a list ClassPathEntry objects. Once 1550 // this list has been created, it must not change order (see class PackageInfo) 1551 // it can be appended to and is by jvmti and the kernel vm. 1552 1553 void ClassLoader::initialize() { 1554 EXCEPTION_MARK; 1555 1556 if (UsePerfData) { 1557 // jvmstat performance counters 1558 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time"); 1559 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime"); 1560 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self"); 1561 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime"); 1562 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self"); 1563 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime"); 1564 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self"); 1565 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses"); 1566 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses"); 1567 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses"); 1568 1569 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime"); 1570 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self"); 1571 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime"); 1572 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime"); 1573 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime"); 1574 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime"); 1575 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self"); 1576 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount"); 1577 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses"); 1578 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime"); 1579 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self"); 1580 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes"); 1581 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes"); 1582 1583 1584 // The following performance counters are added for measuring the impact 1585 // of the bug fix of 6365597. They are mainly focused on finding out 1586 // the behavior of system & user-defined classloader lock, whether 1587 // ClassLoader.loadClass/findClass is being called synchronized or not. 1588 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS, 1589 "systemLoaderLockContentionRate"); 1590 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS, 1591 "nonSystemLoaderLockContentionRate"); 1592 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS, 1593 "jvmFindLoadedClassNoLockCalls"); 1594 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS, 1595 "jvmDefineClassNoLockCalls"); 1596 1597 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS, 1598 "jniDefineClassNoLockCalls"); 1599 1600 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, 1601 "unsafeDefineClassCalls"); 1602 } 1603 1604 // lookup zip library entry points 1605 load_zip_library(); 1606 // lookup jimage library entry points 1607 load_jimage_library(); 1608 #if INCLUDE_CDS 1609 // initialize search path 1610 if (DumpSharedSpaces) { 1611 _shared_paths_misc_info = new SharedPathsMiscInfo(); 1612 } 1613 #endif 1614 setup_bootstrap_search_path(); 1615 } 1616 1617 #if INCLUDE_CDS 1618 void ClassLoader::initialize_shared_path() { 1619 if (DumpSharedSpaces) { 1620 ClassLoaderExt::setup_search_paths(); 1621 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check() 1622 } 1623 } 1624 1625 void ClassLoader::initialize_module_path(TRAPS) { 1626 if (DumpSharedSpaces) { 1627 ClassLoaderExt::setup_module_paths(THREAD); 1628 FileMapInfo::allocate_shared_path_table(); 1629 } 1630 } 1631 #endif 1632 1633 jlong ClassLoader::classloader_time_ms() { 1634 return UsePerfData ? 1635 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1; 1636 } 1637 1638 jlong ClassLoader::class_init_count() { 1639 return UsePerfData ? _perf_classes_inited->get_value() : -1; 1640 } 1641 1642 jlong ClassLoader::class_init_time_ms() { 1643 return UsePerfData ? 1644 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1; 1645 } 1646 1647 jlong ClassLoader::class_verify_time_ms() { 1648 return UsePerfData ? 1649 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1; 1650 } 1651 1652 jlong ClassLoader::class_link_count() { 1653 return UsePerfData ? _perf_classes_linked->get_value() : -1; 1654 } 1655 1656 jlong ClassLoader::class_link_time_ms() { 1657 return UsePerfData ? 1658 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1; 1659 } 1660 1661 int ClassLoader::compute_Object_vtable() { 1662 // hardwired for JDK1.2 -- would need to duplicate class file parsing 1663 // code to determine actual value from file 1664 // Would be value '11' if finals were in vtable 1665 int JDK_1_2_Object_vtable_size = 5; 1666 return JDK_1_2_Object_vtable_size * vtableEntry::size(); 1667 } 1668 1669 1670 void classLoader_init1() { 1671 ClassLoader::initialize(); 1672 } 1673 1674 // Complete the ClassPathEntry setup for the boot loader 1675 void ClassLoader::classLoader_init2(TRAPS) { 1676 // Setup the list of module/path pairs for --patch-module processing 1677 // This must be done after the SymbolTable is created in order 1678 // to use fast_compare on module names instead of a string compare. 1679 if (Arguments::get_patch_mod_prefix() != NULL) { 1680 setup_patch_mod_entries(); 1681 } 1682 1683 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries 1684 // to successfully determine if java.base has been patched) 1685 create_javabase(); 1686 1687 // Setup the initial java.base/path pair for the exploded build entries. 1688 // As more modules are defined during module system initialization, more 1689 // entries will be added to the exploded build array. 1690 if (!has_jrt_entry()) { 1691 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds"); 1692 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds"); 1693 // Set up the boot loader's _exploded_entries list. Note that this gets 1694 // done before loading any classes, by the same thread that will 1695 // subsequently do the first class load. So, no lock is needed for this. 1696 assert(_exploded_entries == NULL, "Should only get initialized once"); 1697 _exploded_entries = new (ResourceObj::C_HEAP, mtModule) 1698 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true); 1699 add_to_exploded_build_list(vmSymbols::java_base(), CHECK); 1700 } 1701 } 1702 1703 1704 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) { 1705 assert(orig != NULL && out != NULL && len > 0, "bad arguments"); 1706 if (CanonicalizeEntry != NULL) { 1707 JavaThread* THREAD = JavaThread::current(); 1708 JNIEnv* env = THREAD->jni_environment(); 1709 ResourceMark rm(THREAD); 1710 1711 // os::native_path writes into orig_copy 1712 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1); 1713 strcpy(orig_copy, orig); 1714 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) { 1715 return false; 1716 } 1717 } else { 1718 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing 1719 strncpy(out, orig, len); 1720 out[len - 1] = '\0'; 1721 } 1722 return true; 1723 } 1724 1725 void ClassLoader::create_javabase() { 1726 Thread* THREAD = Thread::current(); 1727 1728 // Create java.base's module entry for the boot 1729 // class loader prior to loading j.l.Ojbect. 1730 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 1731 1732 // Get module entry table 1733 ModuleEntryTable* null_cld_modules = null_cld->modules(); 1734 if (null_cld_modules == NULL) { 1735 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader"); 1736 } 1737 1738 { 1739 MutexLocker ml(Module_lock, THREAD); 1740 ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(), 1741 false, vmSymbols::java_base(), NULL, NULL, null_cld); 1742 if (jb_module == NULL) { 1743 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME); 1744 } 1745 ModuleEntryTable::set_javabase_moduleEntry(jb_module); 1746 } 1747 } 1748 1749 #ifndef PRODUCT 1750 1751 // CompileTheWorld 1752 // 1753 // Iterates over all class path entries and forces compilation of all methods 1754 // in all classes found. Currently, only zip/jar archives are searched. 1755 // 1756 // The classes are loaded by the Java level bootstrap class loader, and the 1757 // initializer is called. If DelayCompilationDuringStartup is true (default), 1758 // the interpreter will run the initialization code. Note that forcing 1759 // initialization in this way could potentially lead to initialization order 1760 // problems, in which case we could just force the initialization bit to be set. 1761 1762 1763 // We need to iterate over the contents of a zip/jar file, so we replicate the 1764 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile, 1765 // since jzfile already has a void* definition. 1766 // 1767 // Note that this is only used in debug mode. 1768 // 1769 // HotSpot integration note: 1770 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build 1771 1772 1773 // JDK 1.3 version 1774 typedef struct real_jzentry { /* Zip file entry */ 1775 char *name; /* entry name */ 1776 jint time; /* modification time */ 1777 jint size; /* size of uncompressed data */ 1778 jint csize; /* size of compressed data (zero if uncompressed) */ 1779 jint crc; /* crc of uncompressed data */ 1780 char *comment; /* optional zip file comment */ 1781 jbyte *extra; /* optional extra data */ 1782 jint pos; /* position of LOC header (if negative) or data */ 1783 } real_jzentry; 1784 1785 typedef struct real_jzfile { /* Zip file */ 1786 char *name; /* zip file name */ 1787 jint refs; /* number of active references */ 1788 jint fd; /* open file descriptor */ 1789 void *lock; /* read lock */ 1790 char *comment; /* zip file comment */ 1791 char *msg; /* zip error message */ 1792 void *entries; /* array of hash cells */ 1793 jint total; /* total number of entries */ 1794 unsigned short *table; /* Hash chain heads: indexes into entries */ 1795 jint tablelen; /* number of hash eads */ 1796 real_jzfile *next; /* next zip file in search list */ 1797 jzentry *cache; /* we cache the most recently freed jzentry */ 1798 /* Information on metadata names in META-INF directory */ 1799 char **metanames; /* array of meta names (may have null names) */ 1800 jint metacount; /* number of slots in metanames array */ 1801 /* If there are any per-entry comments, they are in the comments array */ 1802 char **comments; 1803 } real_jzfile; 1804 1805 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) { 1806 // For now we only compile all methods in all classes in zip/jar files 1807 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir); 1808 tty->cr(); 1809 } 1810 1811 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) { 1812 real_jzfile* zip = (real_jzfile*) _zip; 1813 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name); 1814 tty->cr(); 1815 // Iterate over all entries in zip file 1816 for (int n = 0; ; n++) { 1817 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n)); 1818 if (ze == NULL) break; 1819 ClassLoader::compile_the_world_in(ze->name, loader, CHECK); 1820 } 1821 if (HAS_PENDING_EXCEPTION) { 1822 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1823 CLEAR_PENDING_EXCEPTION; 1824 tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); 1825 tty->print_cr("Increase class metadata storage if a limit was set"); 1826 } else { 1827 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); 1828 } 1829 } 1830 } 1831 1832 void ClassLoader::compile_the_world() { 1833 EXCEPTION_MARK; 1834 HandleMark hm(THREAD); 1835 ResourceMark rm(THREAD); 1836 1837 assert(has_jrt_entry(), "Compile The World not supported with exploded module build"); 1838 1839 // Find bootstrap loader 1840 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader()); 1841 jlong start = os::javaTimeMillis(); 1842 1843 // Compile the world for the modular java runtime image 1844 _jrt_entry->compile_the_world(system_class_loader, CATCH); 1845 1846 // Iterate over all bootstrap class path appended entries 1847 ClassPathEntry* e = _first_append_entry; 1848 while (e != NULL) { 1849 assert(!e->is_modules_image(), "A modular java runtime image is present on the list of appended entries"); 1850 e->compile_the_world(system_class_loader, CATCH); 1851 e = e->next(); 1852 } 1853 jlong end = os::javaTimeMillis(); 1854 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)", 1855 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start)); 1856 { 1857 // Print statistics as if before normal exit: 1858 extern void print_statistics(); 1859 print_statistics(); 1860 } 1861 vm_exit(0); 1862 } 1863 1864 int ClassLoader::_compile_the_world_class_counter = 0; 1865 int ClassLoader::_compile_the_world_method_counter = 0; 1866 static int _codecache_sweep_counter = 0; 1867 1868 // Filter out all exceptions except OOMs 1869 static void clear_pending_exception_if_not_oom(TRAPS) { 1870 if (HAS_PENDING_EXCEPTION && 1871 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1872 CLEAR_PENDING_EXCEPTION; 1873 } 1874 // The CHECK at the caller will propagate the exception out 1875 } 1876 1877 /** 1878 * Returns if the given method should be compiled when doing compile-the-world. 1879 * 1880 * TODO: This should be a private method in a CompileTheWorld class. 1881 */ 1882 static bool can_be_compiled(const methodHandle& m, int comp_level) { 1883 assert(CompileTheWorld, "must be"); 1884 1885 // It's not valid to compile a native wrapper for MethodHandle methods 1886 // that take a MemberName appendix since the bytecode signature is not 1887 // correct. 1888 vmIntrinsics::ID iid = m->intrinsic_id(); 1889 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) { 1890 return false; 1891 } 1892 1893 return CompilationPolicy::can_be_compiled(m, comp_level); 1894 } 1895 1896 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) { 1897 if (string_ends_with(name, ".class")) { 1898 // We have a .class file 1899 int len = (int)strlen(name); 1900 char buffer[2048]; 1901 strncpy(buffer, name, len - 6); 1902 buffer[len-6] = 0; 1903 // If the file has a period after removing .class, it's not really a 1904 // valid class file. The class loader will check everything else. 1905 if (strchr(buffer, '.') == NULL) { 1906 _compile_the_world_class_counter++; 1907 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return; 1908 1909 // Construct name without extension 1910 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK); 1911 // Use loader to load and initialize class 1912 Klass* k = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD); 1913 if (k != NULL && !HAS_PENDING_EXCEPTION) { 1914 k->initialize(THREAD); 1915 } 1916 bool exception_occurred = HAS_PENDING_EXCEPTION; 1917 clear_pending_exception_if_not_oom(CHECK); 1918 if (CompileTheWorldPreloadClasses && k != NULL) { 1919 InstanceKlass* ik = InstanceKlass::cast(k); 1920 ConstantPool::preload_and_initialize_all_classes(ik->constants(), THREAD); 1921 if (HAS_PENDING_EXCEPTION) { 1922 // If something went wrong in preloading we just ignore it 1923 clear_pending_exception_if_not_oom(CHECK); 1924 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer); 1925 } 1926 } 1927 1928 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) { 1929 if (k == NULL || exception_occurred) { 1930 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class 1931 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer); 1932 } else { 1933 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer); 1934 // Preload all classes to get around uncommon traps 1935 // Iterate over all methods in class 1936 int comp_level = CompilationPolicy::policy()->initial_compile_level(); 1937 InstanceKlass* ik = InstanceKlass::cast(k); 1938 for (int n = 0; n < ik->methods()->length(); n++) { 1939 methodHandle m (THREAD, ik->methods()->at(n)); 1940 if (can_be_compiled(m, comp_level)) { 1941 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) { 1942 // Give sweeper a chance to keep up with CTW 1943 VM_CTWThreshold op; 1944 VMThread::execute(&op); 1945 _codecache_sweep_counter = 0; 1946 } 1947 // Force compilation 1948 CompileBroker::compile_method(m, InvocationEntryBci, comp_level, 1949 methodHandle(), 0, CompileTask::Reason_CTW, THREAD); 1950 if (HAS_PENDING_EXCEPTION) { 1951 clear_pending_exception_if_not_oom(CHECK); 1952 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1953 } else { 1954 _compile_the_world_method_counter++; 1955 } 1956 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) { 1957 // Clobber the first compile and force second tier compilation 1958 CompiledMethod* nm = m->code(); 1959 if (nm != NULL && !m->is_method_handle_intrinsic()) { 1960 // Throw out the code so that the code cache doesn't fill up 1961 nm->make_not_entrant(); 1962 } 1963 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization, 1964 methodHandle(), 0, CompileTask::Reason_CTW, THREAD); 1965 if (HAS_PENDING_EXCEPTION) { 1966 clear_pending_exception_if_not_oom(CHECK); 1967 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1968 } else { 1969 _compile_the_world_method_counter++; 1970 } 1971 } 1972 } else { 1973 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1974 } 1975 1976 CompiledMethod* nm = m->code(); 1977 if (nm != NULL && !m->is_method_handle_intrinsic()) { 1978 // Throw out the code so that the code cache doesn't fill up 1979 nm->make_not_entrant(); 1980 } 1981 } 1982 } 1983 } 1984 } 1985 } 1986 } 1987 1988 #endif //PRODUCT 1989 1990 // Please keep following two functions at end of this file. With them placed at top or in middle of the file, 1991 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589. 1992 void PerfClassTraceTime::initialize() { 1993 if (!UsePerfData) return; 1994 1995 if (_eventp != NULL) { 1996 // increment the event counter 1997 _eventp->inc(); 1998 } 1999 2000 // stop the current active thread-local timer to measure inclusive time 2001 _prev_active_event = -1; 2002 for (int i=0; i < EVENT_TYPE_COUNT; i++) { 2003 if (_timers[i].is_active()) { 2004 assert(_prev_active_event == -1, "should have only one active timer"); 2005 _prev_active_event = i; 2006 _timers[i].stop(); 2007 } 2008 } 2009 2010 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) { 2011 // start the inclusive timer if not recursively called 2012 _t.start(); 2013 } 2014 2015 // start thread-local timer of the given event type 2016 if (!_timers[_event_type].is_active()) { 2017 _timers[_event_type].start(); 2018 } 2019 } 2020 2021 PerfClassTraceTime::~PerfClassTraceTime() { 2022 if (!UsePerfData) return; 2023 2024 // stop the thread-local timer as the event completes 2025 // and resume the thread-local timer of the event next on the stack 2026 _timers[_event_type].stop(); 2027 jlong selftime = _timers[_event_type].ticks(); 2028 2029 if (_prev_active_event >= 0) { 2030 _timers[_prev_active_event].start(); 2031 } 2032 2033 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return; 2034 2035 // increment the counters only on the leaf call 2036 _t.stop(); 2037 _timep->inc(_t.ticks()); 2038 if (_selftimep != NULL) { 2039 _selftimep->inc(selftime); 2040 } 2041 // add all class loading related event selftime to the accumulated time counter 2042 ClassLoader::perf_accumulated_time()->inc(selftime); 2043 2044 // reset the timer 2045 _timers[_event_type].reset(); 2046 }