1 /* 2 * Copyright (c) 1997, 2016, 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 "classfile/classFileStream.hpp" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/classLoaderData.inline.hpp" 29 #include "classfile/classLoaderExt.hpp" 30 #include "classfile/javaClasses.hpp" 31 #include "classfile/jimage.hpp" 32 #include "classfile/moduleEntry.hpp" 33 #include "classfile/modules.hpp" 34 #include "classfile/packageEntry.hpp" 35 #include "classfile/klassFactory.hpp" 36 #include "classfile/systemDictionary.hpp" 37 #include "classfile/vmSymbols.hpp" 38 #include "compiler/compileBroker.hpp" 39 #include "gc/shared/collectedHeap.inline.hpp" 40 #include "gc/shared/generation.hpp" 41 #include "interpreter/bytecodeStream.hpp" 42 #include "interpreter/oopMapCache.hpp" 43 #include "logging/logTag.hpp" 44 #include "memory/allocation.inline.hpp" 45 #include "memory/filemap.hpp" 46 #include "memory/oopFactory.hpp" 47 #include "memory/resourceArea.hpp" 48 #include "memory/universe.inline.hpp" 49 #include "oops/instanceKlass.hpp" 50 #include "oops/instanceRefKlass.hpp" 51 #include "oops/objArrayOop.inline.hpp" 52 #include "oops/oop.inline.hpp" 53 #include "oops/symbol.hpp" 54 #include "prims/jvm_misc.hpp" 55 #include "runtime/arguments.hpp" 56 #include "runtime/compilationPolicy.hpp" 57 #include "runtime/fprofiler.hpp" 58 #include "runtime/handles.hpp" 59 #include "runtime/handles.inline.hpp" 60 #include "runtime/init.hpp" 61 #include "runtime/interfaceSupport.hpp" 62 #include "runtime/java.hpp" 63 #include "runtime/javaCalls.hpp" 64 #include "runtime/os.hpp" 65 #include "runtime/threadCritical.hpp" 66 #include "runtime/timer.hpp" 67 #include "runtime/vm_version.hpp" 68 #include "services/management.hpp" 69 #include "services/threadService.hpp" 70 #include "utilities/events.hpp" 71 #include "utilities/hashtable.inline.hpp" 72 #include "utilities/macros.hpp" 73 #if INCLUDE_CDS 74 #include "classfile/sharedClassUtil.hpp" 75 #include "classfile/sharedPathsMiscInfo.hpp" 76 #endif 77 78 // Entry points in zip.dll for loading zip/jar file entries 79 80 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg); 81 typedef void (JNICALL *ZipClose_t)(jzfile *zip); 82 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen); 83 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf); 84 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n); 85 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg); 86 typedef jint (JNICALL *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 PerfCounter* ClassLoader::_isUnsyncloadClass = NULL; 139 PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL; 140 141 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL; 142 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL; 143 ClassPathEntry* ClassLoader::_jrt_entry = NULL; 144 ClassPathEntry* ClassLoader::_first_append_entry = NULL; 145 ClassPathEntry* ClassLoader::_last_append_entry = NULL; 146 int ClassLoader::_num_entries = 0; 147 #if INCLUDE_CDS 148 GrowableArray<char*>* ClassLoader::_boot_modules_array = NULL; 149 GrowableArray<char*>* ClassLoader::_platform_modules_array = NULL; 150 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL; 151 #endif 152 153 // helper routines 154 bool string_starts_with(const char* str, const char* str_to_find) { 155 size_t str_len = strlen(str); 156 size_t str_to_find_len = strlen(str_to_find); 157 if (str_to_find_len > str_len) { 158 return false; 159 } 160 return (strncmp(str, str_to_find, str_to_find_len) == 0); 161 } 162 163 static const char* get_jimage_version_string() { 164 static char version_string[10] = ""; 165 if (version_string[0] == '\0') { 166 jio_snprintf(version_string, sizeof(version_string), "%d.%d", 167 Abstract_VM_Version::vm_major_version(), Abstract_VM_Version::vm_minor_version()); 168 } 169 return (const char*)version_string; 170 } 171 172 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) { 173 size_t str_len = strlen(str); 174 size_t str_to_find_len = strlen(str_to_find); 175 if (str_to_find_len > str_len) { 176 return false; 177 } 178 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0); 179 } 180 181 // Used to obtain the package name from a fully qualified class name. 182 // It is the responsibility of the caller to establish a ResourceMark. 183 const char* ClassLoader::package_from_name(const char* const class_name, bool* bad_class_name) { 184 if (class_name == NULL) { 185 if (bad_class_name != NULL) { 186 *bad_class_name = true; 187 } 188 return NULL; 189 } 190 191 if (bad_class_name != NULL) { 192 *bad_class_name = false; 193 } 194 195 const char* const last_slash = strrchr(class_name, '/'); 196 if (last_slash == NULL) { 197 // No package name 198 return NULL; 199 } 200 201 char* class_name_ptr = (char*) class_name; 202 // Skip over '['s 203 if (*class_name_ptr == '[') { 204 do { 205 class_name_ptr++; 206 } while (*class_name_ptr == '['); 207 208 // Fully qualified class names should not contain a 'L'. 209 // Set bad_class_name to true to indicate that the package name 210 // could not be obtained due to an error condition. 211 // In this situation, is_same_class_package returns false. 212 if (*class_name_ptr == 'L') { 213 if (bad_class_name != NULL) { 214 *bad_class_name = true; 215 } 216 return NULL; 217 } 218 } 219 220 int length = last_slash - class_name_ptr; 221 222 // A class name could have just the slash character in the name. 223 if (length <= 0) { 224 // No package name 225 if (bad_class_name != NULL) { 226 *bad_class_name = true; 227 } 228 return NULL; 229 } 230 231 // drop name after last slash (including slash) 232 // Ex., "java/lang/String.class" => "java/lang" 233 char* pkg_name = NEW_RESOURCE_ARRAY(char, length + 1); 234 strncpy(pkg_name, class_name_ptr, length); 235 *(pkg_name+length) = '\0'; 236 237 return (const char *)pkg_name; 238 } 239 240 // Given a fully qualified class name, find its defining package in the class loader's 241 // package entry table. 242 static PackageEntry* get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS) { 243 ResourceMark rm(THREAD); 244 const char *pkg_name = ClassLoader::package_from_name(class_name); 245 if (pkg_name == NULL) { 246 return NULL; 247 } 248 PackageEntryTable* pkgEntryTable = loader_data->packages(); 249 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(pkg_name, CHECK_NULL); 250 return pkgEntryTable->lookup_only(pkg_symbol); 251 } 252 253 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() { 254 char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass); 255 strcpy(copy, dir); 256 _dir = copy; 257 } 258 259 260 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) { 261 // construct full path name 262 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN); 263 if (jio_snprintf(path, JVM_MAXPATHLEN, "%s%s%s", _dir, os::file_separator(), name) == -1) { 264 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN); 265 return NULL; 266 } 267 // check if file exists 268 struct stat st; 269 if (os::stat(path, &st) == 0) { 270 #if INCLUDE_CDS 271 if (DumpSharedSpaces) { 272 // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so 273 // we should never find a file underneath it -- unless user has added a new file while we are running 274 // the dump, in which case let's quit! 275 ShouldNotReachHere(); 276 } 277 #endif 278 // found file, open it 279 int file_handle = os::open(path, 0, 0); 280 if (file_handle != -1) { 281 // read contents into resource array 282 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size); 283 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size); 284 // close file 285 os::close(file_handle); 286 // construct ClassFileStream 287 if (num_read == (size_t)st.st_size) { 288 if (UsePerfData) { 289 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read); 290 } 291 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN); 292 // Resource allocated 293 return new ClassFileStream(buffer, 294 st.st_size, 295 _dir, 296 ClassFileStream::verify); 297 } 298 } 299 } 300 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN); 301 return NULL; 302 } 303 304 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() { 305 _zip = zip; 306 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass); 307 strcpy(copy, zip_name); 308 _zip_name = copy; 309 _is_boot_append = is_boot_append; 310 _multi_versioned = _unknown; 311 } 312 313 ClassPathZipEntry::~ClassPathZipEntry() { 314 if (ZipClose != NULL) { 315 (*ZipClose)(_zip); 316 } 317 FREE_C_HEAP_ARRAY(char, _zip_name); 318 } 319 320 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) { 321 // enable call to C land 322 JavaThread* thread = JavaThread::current(); 323 ThreadToNativeFromVM ttn(thread); 324 // check whether zip archive contains name 325 jint name_len; 326 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len); 327 if (entry == NULL) return NULL; 328 u1* buffer; 329 char name_buf[128]; 330 char* filename; 331 if (name_len < 128) { 332 filename = name_buf; 333 } else { 334 filename = NEW_RESOURCE_ARRAY(char, name_len + 1); 335 } 336 337 // read contents into resource array 338 int size = (*filesize) + ((nul_terminate) ? 1 : 0); 339 buffer = NEW_RESOURCE_ARRAY(u1, size); 340 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL; 341 342 // return result 343 if (nul_terminate) { 344 buffer[*filesize] = 0; 345 } 346 return buffer; 347 } 348 349 #if INCLUDE_CDS 350 u1* ClassPathZipEntry::open_versioned_entry(const char* name, jint* filesize, TRAPS) { 351 u1* buffer = NULL; 352 if (DumpSharedSpaces && !_is_boot_append) { 353 // We presume default is multi-release enabled 354 const char* multi_ver = Arguments::get_property("jdk.util.jar.enableMultiRelease"); 355 const char* verstr = Arguments::get_property("jdk.util.jar.version"); 356 bool is_multi_ver = (multi_ver == NULL || 357 strcmp(multi_ver, "true") == 0 || 358 strcmp(multi_ver, "force") == 0) && 359 is_multiple_versioned(THREAD); 360 // command line version setting 361 int version = 0; 362 const int base_version = 8; // JDK8 363 int cur_ver = JDK_Version::current().major_version(); 364 if (verstr != NULL) { 365 version = atoi(verstr); 366 if (version < base_version || version > cur_ver) { 367 is_multi_ver = false; 368 // print out warning, do not use assertion here since it will continue to look 369 // for proper version. 370 warning("JDK%d is not supported in multiple version jars", version); 371 } 372 } 373 374 if (is_multi_ver) { 375 int n; 376 char* entry_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN); 377 if (version > 0) { 378 n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", version, name); 379 entry_name[n] = '\0'; 380 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL); 381 if (buffer == NULL) { 382 warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name); 383 } 384 } 385 if (buffer == NULL) { 386 for (int i = cur_ver; i >= base_version; i--) { 387 n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", i, name); 388 entry_name[n] = '\0'; 389 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL); 390 if (buffer != NULL) { 391 break; 392 } 393 } 394 } 395 FREE_RESOURCE_ARRAY(char, entry_name, JVM_MAXPATHLEN); 396 } 397 } 398 return buffer; 399 } 400 401 bool ClassPathZipEntry::is_multiple_versioned(TRAPS) { 402 assert(DumpSharedSpaces, "called only at dump time"); 403 if (_multi_versioned != _unknown) { 404 return (_multi_versioned == _yes) ? true : false; 405 } 406 jint size; 407 char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, true, CHECK_false); 408 if (buffer != NULL) { 409 char* p = buffer; 410 for ( ; *p; ++p) *p = tolower(*p); 411 if (strstr(buffer, "multi-release: true") != NULL) { 412 _multi_versioned = _yes; 413 return true; 414 } 415 } 416 _multi_versioned = _no; 417 return false; 418 } 419 #endif // INCLUDE_CDS 420 421 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) { 422 jint filesize; 423 u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL); 424 if (buffer == NULL) { 425 buffer = open_entry(name, &filesize, false, CHECK_NULL); 426 if (buffer == NULL) { 427 return NULL; 428 } 429 } 430 if (UsePerfData) { 431 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize); 432 } 433 // Resource allocated 434 return new ClassFileStream(buffer, 435 filesize, 436 _zip_name, 437 ClassFileStream::verify); 438 } 439 440 // invoke function for each entry in the zip file 441 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) { 442 JavaThread* thread = JavaThread::current(); 443 HandleMark handle_mark(thread); 444 ThreadToNativeFromVM ttn(thread); 445 for (int n = 0; ; n++) { 446 jzentry * ze = ((*GetNextEntry)(_zip, n)); 447 if (ze == NULL) break; 448 (*f)(ze->name, context); 449 } 450 } 451 452 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) : 453 ClassPathEntry(), 454 _jimage(jimage) { 455 guarantee(jimage != NULL, "jimage file is null"); 456 guarantee(name != NULL, "jimage file name is null"); 457 size_t len = strlen(name) + 1; 458 _name = NEW_C_HEAP_ARRAY(const char, len, mtClass); 459 strncpy((char *)_name, name, len); 460 } 461 462 ClassPathImageEntry::~ClassPathImageEntry() { 463 if (_name != NULL) { 464 FREE_C_HEAP_ARRAY(const char, _name); 465 _name = NULL; 466 } 467 if (_jimage != NULL) { 468 (*JImageClose)(_jimage); 469 _jimage = NULL; 470 } 471 } 472 473 // For a class in a named module, look it up in the jimage file using this syntax: 474 // /<module-name>/<package-name>/<base-class> 475 // 476 // Assumptions: 477 // 1. There are no unnamed modules in the jimage file. 478 // 2. A package is in at most one module in the jimage file. 479 // 480 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) { 481 jlong size; 482 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size); 483 484 if (location == 0) { 485 ResourceMark rm; 486 const char* pkg_name = ClassLoader::package_from_name(name); 487 488 if (pkg_name != NULL) { 489 if (!Universe::is_module_initialized()) { 490 location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size); 491 #if INCLUDE_CDS 492 // CDS uses the boot class loader to load classes whose packages are in 493 // modules defined for other class loaders. So, for now, get their module 494 // names from the "modules" jimage file. 495 if (DumpSharedSpaces && location == 0) { 496 const char* module_name = (*JImagePackageToModule)(_jimage, pkg_name); 497 if (module_name != NULL) { 498 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size); 499 } 500 } 501 #endif 502 503 } else { 504 PackageEntry* package_entry = get_package_entry(name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL); 505 if (package_entry != NULL) { 506 ResourceMark rm; 507 // Get the module name 508 ModuleEntry* module = package_entry->module(); 509 assert(module != NULL, "Boot classLoader package missing module"); 510 assert(module->is_named(), "Boot classLoader package is in unnamed module"); 511 const char* module_name = module->name()->as_C_string(); 512 if (module_name != NULL) { 513 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size); 514 } 515 } 516 } 517 } 518 } 519 if (location != 0) { 520 if (UsePerfData) { 521 ClassLoader::perf_sys_classfile_bytes_read()->inc(size); 522 } 523 char* data = NEW_RESOURCE_ARRAY(char, size); 524 (*JImageGetResource)(_jimage, location, data, size); 525 // Resource allocated 526 return new ClassFileStream((u1*)data, 527 (int)size, 528 _name, 529 ClassFileStream::verify); 530 } 531 532 return NULL; 533 } 534 535 #ifndef PRODUCT 536 bool ctw_visitor(JImageFile* jimage, 537 const char* module_name, const char* version, const char* package, 538 const char* name, const char* extension, void* arg) { 539 if (strcmp(extension, "class") == 0) { 540 Thread* THREAD = Thread::current(); 541 ResourceMark rm(THREAD); 542 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JIMAGE_MAX_PATH); 543 jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name); 544 ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD); 545 return !HAS_PENDING_EXCEPTION; 546 } 547 return true; 548 } 549 550 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) { 551 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name()); 552 tty->cr(); 553 (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader); 554 if (HAS_PENDING_EXCEPTION) { 555 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 556 CLEAR_PENDING_EXCEPTION; 557 tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); 558 tty->print_cr("Increase class metadata storage if a limit was set"); 559 } else { 560 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); 561 } 562 } 563 } 564 #endif 565 566 bool ClassPathImageEntry::is_jrt() { 567 return ClassLoader::is_jrt(name()); 568 } 569 570 #if INCLUDE_CDS 571 void ClassLoader::exit_with_path_failure(const char* error, const char* message) { 572 assert(DumpSharedSpaces, "only called at dump time"); 573 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure"); 574 vm_exit_during_initialization(error, message); 575 } 576 #endif 577 578 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) { 579 _module_name = module_name; 580 _module_first_entry = NULL; 581 _module_last_entry = NULL; 582 } 583 584 ModuleClassPathList::~ModuleClassPathList() { 585 // Clean out each ClassPathEntry on list 586 ClassPathEntry* e = _module_first_entry; 587 while (e != NULL) { 588 ClassPathEntry* next_entry = e->next(); 589 delete e; 590 e = next_entry; 591 } 592 } 593 594 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) { 595 if (new_entry != NULL) { 596 if (_module_last_entry == NULL) { 597 _module_first_entry = _module_last_entry = new_entry; 598 } else { 599 _module_last_entry->set_next(new_entry); 600 _module_last_entry = new_entry; 601 } 602 } 603 } 604 605 void ClassLoader::trace_class_path(const char* msg, const char* name) { 606 if (log_is_enabled(Info, class, path)) { 607 ResourceMark rm; 608 outputStream* out = Log(class, path)::info_stream(); 609 if (msg) { 610 out->print("%s", msg); 611 } 612 if (name) { 613 if (strlen(name) < 256) { 614 out->print("%s", name); 615 } else { 616 // For very long paths, we need to print each character separately, 617 // as print_cr() has a length limit 618 while (name[0] != '\0') { 619 out->print("%c", name[0]); 620 name++; 621 } 622 } 623 } 624 out->cr(); 625 } 626 } 627 628 #if INCLUDE_CDS 629 void ClassLoader::check_shared_classpath(const char *path) { 630 if (strcmp(path, "") == 0) { 631 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL); 632 } 633 634 struct stat st; 635 if (os::stat(path, &st) == 0) { 636 if ((st.st_mode & S_IFMT) != S_IFREG) { // is not a regular file 637 if (!os::dir_is_empty(path)) { 638 tty->print_cr("Error: non-empty directory '%s'", path); 639 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL); 640 } 641 } 642 } 643 } 644 #endif 645 646 void ClassLoader::setup_bootstrap_search_path() { 647 const char* sys_class_path = Arguments::get_sysclasspath(); 648 const char* java_class_path = Arguments::get_appclasspath(); 649 if (PrintSharedArchiveAndExit) { 650 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily 651 // the same as the bootcp of the shared archive. 652 } else { 653 trace_class_path("bootstrap loader class path=", sys_class_path); 654 trace_class_path("classpath: ", java_class_path); 655 } 656 #if INCLUDE_CDS 657 if (DumpSharedSpaces) { 658 _shared_paths_misc_info->add_boot_classpath(sys_class_path); 659 } 660 #endif 661 setup_search_path(sys_class_path, true); 662 } 663 664 #if INCLUDE_CDS 665 int ClassLoader::get_shared_paths_misc_info_size() { 666 return _shared_paths_misc_info->get_used_bytes(); 667 } 668 669 void* ClassLoader::get_shared_paths_misc_info() { 670 return _shared_paths_misc_info->buffer(); 671 } 672 673 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) { 674 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size); 675 bool result = checker->check(); 676 delete checker; 677 return result; 678 } 679 #endif 680 681 // Construct the array of module/path pairs as specified to --patch-module 682 // for the boot loader to search ahead of the jimage, if the class being 683 // loaded is defined to a module that has been specified to --patch-module. 684 void ClassLoader::setup_patch_mod_entries() { 685 Thread* THREAD = Thread::current(); 686 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix(); 687 int num_of_entries = patch_mod_args->length(); 688 689 690 // Set up the boot loader's _patch_mod_entries list 691 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true); 692 693 for (int i = 0; i < num_of_entries; i++) { 694 const char* module_name = (patch_mod_args->at(i))->module_name(); 695 Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK); 696 assert(module_sym != NULL, "Failed to obtain Symbol for module name"); 697 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym); 698 699 char* class_path = (patch_mod_args->at(i))->path_string(); 700 int len = (int)strlen(class_path); 701 int end = 0; 702 // Iterate over the module's class path entries 703 for (int start = 0; start < len; start = end) { 704 while (class_path[end] && class_path[end] != os::path_separator()[0]) { 705 end++; 706 } 707 EXCEPTION_MARK; 708 ResourceMark rm(THREAD); 709 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1); 710 strncpy(path, &class_path[start], end - start); 711 path[end - start] = '\0'; 712 713 struct stat st; 714 if (os::stat(path, &st) == 0) { 715 // File or directory found 716 Thread* THREAD = Thread::current(); 717 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK); 718 // If the path specification is valid, enter it into this module's list 719 if (new_entry != NULL) { 720 module_cpl->add_to_list(new_entry); 721 } 722 } 723 724 while (class_path[end] == os::path_separator()[0]) { 725 end++; 726 } 727 } 728 729 // Record the module into the list of --patch-module entries only if 730 // valid ClassPathEntrys have been created 731 if (module_cpl->module_first_entry() != NULL) { 732 _patch_mod_entries->push(module_cpl); 733 } 734 } 735 } 736 737 // Determine whether the module has been patched via the command-line 738 // option --patch-module 739 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) { 740 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) { 741 int table_len = _patch_mod_entries->length(); 742 for (int i = 0; i < table_len; i++) { 743 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i); 744 if (module_name->fast_compare(patch_mod->module_name()) == 0) { 745 return true; 746 } 747 } 748 } 749 return false; 750 } 751 752 void ClassLoader::setup_search_path(const char *class_path, bool bootstrap_search) { 753 int len = (int)strlen(class_path); 754 int end = 0; 755 bool set_base_piece = bootstrap_search; 756 757 // Iterate over class path entries 758 for (int start = 0; start < len; start = end) { 759 while (class_path[end] && class_path[end] != os::path_separator()[0]) { 760 end++; 761 } 762 EXCEPTION_MARK; 763 ResourceMark rm(THREAD); 764 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1); 765 strncpy(path, &class_path[start], end - start); 766 path[end - start] = '\0'; 767 768 // The first time through the bootstrap_search setup, it must be determined 769 // what the base or core piece of the boot loader search is. Either a java runtime 770 // image is present or this is an exploded module build situation. 771 if (set_base_piece) { 772 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME), 773 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build"); 774 struct stat st; 775 if (os::stat(path, &st) == 0) { 776 // Directory found 777 Thread* THREAD = Thread::current(); 778 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK); 779 780 // Check for a jimage 781 if (Arguments::has_jimage()) { 782 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice"); 783 assert(new_entry != NULL && new_entry->is_jrt(), "No java runtime image present"); 784 _jrt_entry = new_entry; 785 ++_num_entries; 786 #if INCLUDE_CDS 787 if (DumpSharedSpaces) { 788 JImageFile *jimage = _jrt_entry->jimage(); 789 assert(jimage != NULL, "No java runtime image file present"); 790 ClassLoader::initialize_module_loader_map(jimage); 791 } 792 #endif 793 } 794 } else { 795 // If path does not exist, exit 796 vm_exit_during_initialization("Unable to establish the boot loader search path", path); 797 } 798 set_base_piece = false; 799 } else { 800 // Every entry on the system boot class path after the initial base piece, 801 // which is set by os::set_boot_path(), is considered an appended entry. 802 update_class_path_entry_list(path, false, bootstrap_search); 803 } 804 805 #if INCLUDE_CDS 806 if (DumpSharedSpaces) { 807 check_shared_classpath(path); 808 } 809 #endif 810 while (class_path[end] == os::path_separator()[0]) { 811 end++; 812 } 813 } 814 } 815 816 // During an exploded modules build, each module defined to the boot loader 817 // will be added to the ClassLoader::_exploded_entries array. 818 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) { 819 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable"); 820 821 // Set up the boot loader's _exploded_entries list 822 if (_exploded_entries == NULL) { 823 _exploded_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true); 824 } 825 826 // Find the module's symbol 827 ResourceMark rm(THREAD); 828 const char *module_name = module_sym->as_C_string(); 829 const char *home = Arguments::get_java_home(); 830 const char file_sep = os::file_separator()[0]; 831 // 10 represents the length of "modules" + 2 file separators + \0 832 size_t len = strlen(home) + strlen(module_name) + 10; 833 char *path = NEW_C_HEAP_ARRAY(char, len, mtModule); 834 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name); 835 836 struct stat st; 837 if (os::stat(path, &st) == 0) { 838 // Directory found 839 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK); 840 841 // If the path specification is valid, enter it into this module's list. 842 // There is no need to check for duplicate modules in the exploded entry list, 843 // since no two modules with the same name can be defined to the boot loader. 844 // This is checked at module definition time in Modules::define_module. 845 if (new_entry != NULL) { 846 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym); 847 module_cpl->add_to_list(new_entry); 848 _exploded_entries->push(module_cpl); 849 log_info(class, load)("path: %s", path); 850 } 851 } 852 FREE_C_HEAP_ARRAY(char, path); 853 } 854 855 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st, 856 bool throw_exception, 857 bool is_boot_append, TRAPS) { 858 JavaThread* thread = JavaThread::current(); 859 ClassPathEntry* new_entry = NULL; 860 if ((st->st_mode & S_IFMT) == S_IFREG) { 861 ResourceMark rm(thread); 862 // Regular file, should be a zip or jimage file 863 // Canonicalized filename 864 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN); 865 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 866 // This matches the classic VM 867 if (throw_exception) { 868 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL); 869 } else { 870 return NULL; 871 } 872 } 873 jint error; 874 JImageFile* jimage =(*JImageOpen)(canonical_path, &error); 875 if (jimage != NULL) { 876 new_entry = new ClassPathImageEntry(jimage, canonical_path); 877 } else { 878 char* error_msg = NULL; 879 jzfile* zip; 880 { 881 // enable call to C land 882 ThreadToNativeFromVM ttn(thread); 883 HandleMark hm(thread); 884 zip = (*ZipOpen)(canonical_path, &error_msg); 885 } 886 if (zip != NULL && error_msg == NULL) { 887 new_entry = new ClassPathZipEntry(zip, path, is_boot_append); 888 } else { 889 char *msg; 890 if (error_msg == NULL) { 891 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ; 892 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path); 893 } else { 894 int len = (int)(strlen(path) + strlen(error_msg) + 128); 895 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ; 896 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path); 897 } 898 // Don't complain about bad jar files added via -Xbootclasspath/a:. 899 if (throw_exception && is_init_completed()) { 900 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL); 901 } else { 902 return NULL; 903 } 904 } 905 } 906 log_info(class, path)("opened: %s", path); 907 log_info(class, load)("opened: %s", path); 908 } else { 909 // Directory 910 new_entry = new ClassPathDirEntry(path); 911 log_info(class, load)("path: %s", path); 912 } 913 return new_entry; 914 } 915 916 917 // Create a class path zip entry for a given path (return NULL if not found 918 // or zip/JAR file cannot be opened) 919 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) { 920 // check for a regular file 921 struct stat st; 922 if (os::stat(path, &st) == 0) { 923 if ((st.st_mode & S_IFMT) == S_IFREG) { 924 char canonical_path[JVM_MAXPATHLEN]; 925 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 926 char* error_msg = NULL; 927 jzfile* zip; 928 { 929 // enable call to C land 930 JavaThread* thread = JavaThread::current(); 931 ThreadToNativeFromVM ttn(thread); 932 HandleMark hm(thread); 933 zip = (*ZipOpen)(canonical_path, &error_msg); 934 } 935 if (zip != NULL && error_msg == NULL) { 936 // create using canonical path 937 return new ClassPathZipEntry(zip, canonical_path, is_boot_append); 938 } 939 } 940 } 941 } 942 return NULL; 943 } 944 945 // returns true if entry already on class path 946 bool ClassLoader::contains_append_entry(const char* name) { 947 ClassPathEntry* e = _first_append_entry; 948 while (e != NULL) { 949 // assume zip entries have been canonicalized 950 if (strcmp(name, e->name()) == 0) { 951 return true; 952 } 953 e = e->next(); 954 } 955 return false; 956 } 957 958 void ClassLoader::add_to_list(ClassPathEntry *new_entry) { 959 if (new_entry != NULL) { 960 if (_last_append_entry == NULL) { 961 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty"); 962 _first_append_entry = _last_append_entry = new_entry; 963 } else { 964 _last_append_entry->set_next(new_entry); 965 _last_append_entry = new_entry; 966 } 967 } 968 _num_entries++; 969 } 970 971 void ClassLoader::add_to_list(const char *apath) { 972 update_class_path_entry_list((char*)apath, false, false); 973 } 974 975 // Returns true IFF the file/dir exists and the entry was successfully created. 976 bool ClassLoader::update_class_path_entry_list(const char *path, 977 bool check_for_duplicates, 978 bool is_boot_append, 979 bool throw_exception) { 980 struct stat st; 981 if (os::stat(path, &st) == 0) { 982 // File or directory found 983 ClassPathEntry* new_entry = NULL; 984 Thread* THREAD = Thread::current(); 985 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false)); 986 if (new_entry == NULL) { 987 return false; 988 } 989 990 // Do not reorder the bootclasspath which would break get_system_package(). 991 // Add new entry to linked list 992 if (!check_for_duplicates || !contains_append_entry(new_entry->name())) { 993 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry); 994 } 995 return true; 996 } else { 997 #if INCLUDE_CDS 998 if (DumpSharedSpaces) { 999 _shared_paths_misc_info->add_nonexist_path(path); 1000 } 1001 #endif 1002 return false; 1003 } 1004 } 1005 1006 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) { 1007 ResourceMark rm; 1008 int num_of_entries = module_list->length(); 1009 for (int i = 0; i < num_of_entries; i++) { 1010 ClassPathEntry* e; 1011 ModuleClassPathList* mpl = module_list->at(i); 1012 tty->print("%s=", mpl->module_name()->as_C_string()); 1013 e = mpl->module_first_entry(); 1014 while (e != NULL) { 1015 tty->print("%s", e->name()); 1016 e = e->next(); 1017 if (e != NULL) { 1018 tty->print("%s", os::path_separator()); 1019 } 1020 } 1021 tty->print(" ;"); 1022 } 1023 } 1024 1025 void ClassLoader::print_bootclasspath() { 1026 ClassPathEntry* e; 1027 tty->print("[bootclasspath= "); 1028 1029 // Print --patch-module module/path specifications first 1030 if (_patch_mod_entries != NULL) { 1031 print_module_entry_table(_patch_mod_entries); 1032 } 1033 1034 // [jimage | exploded modules build] 1035 if (has_jrt_entry()) { 1036 // Print the location of the java runtime image 1037 tty->print("%s ;", _jrt_entry->name()); 1038 } else { 1039 // Print exploded module build path specifications 1040 if (_exploded_entries != NULL) { 1041 print_module_entry_table(_exploded_entries); 1042 } 1043 } 1044 1045 // appended entries 1046 e = _first_append_entry; 1047 while (e != NULL) { 1048 tty->print("%s ;", e->name()); 1049 e = e->next(); 1050 } 1051 tty->print_cr("]"); 1052 } 1053 1054 void ClassLoader::load_zip_library() { 1055 assert(ZipOpen == NULL, "should not load zip library twice"); 1056 // First make sure native library is loaded 1057 os::native_java_library(); 1058 // Load zip library 1059 char path[JVM_MAXPATHLEN]; 1060 char ebuf[1024]; 1061 void* handle = NULL; 1062 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) { 1063 handle = os::dll_load(path, ebuf, sizeof ebuf); 1064 } 1065 if (handle == NULL) { 1066 vm_exit_during_initialization("Unable to load ZIP library", path); 1067 } 1068 // Lookup zip entry points 1069 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open")); 1070 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close")); 1071 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry")); 1072 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry")); 1073 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry")); 1074 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully")); 1075 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32")); 1076 1077 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL 1078 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL || 1079 GetNextEntry == NULL || Crc32 == NULL) { 1080 vm_exit_during_initialization("Corrupted ZIP library", path); 1081 } 1082 1083 if (ZipInflateFully == NULL) { 1084 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path); 1085 } 1086 1087 // Lookup canonicalize entry in libjava.dll 1088 void *javalib_handle = os::native_java_library(); 1089 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize")); 1090 // This lookup only works on 1.3. Do not check for non-null here 1091 } 1092 1093 void ClassLoader::load_jimage_library() { 1094 // First make sure native library is loaded 1095 os::native_java_library(); 1096 // Load jimage library 1097 char path[JVM_MAXPATHLEN]; 1098 char ebuf[1024]; 1099 void* handle = NULL; 1100 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) { 1101 handle = os::dll_load(path, ebuf, sizeof ebuf); 1102 } 1103 if (handle == NULL) { 1104 vm_exit_during_initialization("Unable to load jimage library", path); 1105 } 1106 1107 // Lookup jimage entry points 1108 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open")); 1109 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found"); 1110 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close")); 1111 guarantee(JImageClose != NULL, "function JIMAGE_Close not found"); 1112 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule")); 1113 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found"); 1114 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource")); 1115 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found"); 1116 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource")); 1117 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found"); 1118 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator")); 1119 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found"); 1120 JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath")); 1121 guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found"); 1122 } 1123 1124 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) { 1125 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg); 1126 } 1127 1128 int ClassLoader::crc32(int crc, const char* buf, int len) { 1129 assert(Crc32 != NULL, "ZIP_CRC32 is not found"); 1130 return (*Crc32)(crc, (const jbyte*)buf, len); 1131 } 1132 1133 #if INCLUDE_CDS 1134 void ClassLoader::initialize_module_loader_map(JImageFile* jimage) { 1135 if (!DumpSharedSpaces) { 1136 return; // only needed for CDS dump time 1137 } 1138 1139 ResourceMark rm; 1140 jlong size; 1141 JImageLocationRef location = (*JImageFindResource)(jimage, JAVA_BASE_NAME, get_jimage_version_string(), MODULE_LOADER_MAP, &size); 1142 if (location == 0) { 1143 vm_exit_during_initialization( 1144 "Cannot find ModuleLoaderMap location from modules jimage.", NULL); 1145 } 1146 char* buffer = NEW_RESOURCE_ARRAY(char, size + 1); 1147 buffer[size] = '\0'; 1148 jlong read = (*JImageGetResource)(jimage, location, buffer, size); 1149 if (read != size) { 1150 vm_exit_during_initialization( 1151 "Cannot find ModuleLoaderMap resource from modules jimage.", NULL); 1152 } 1153 char* char_buf = (char*)buffer; 1154 int buflen = (int)strlen(char_buf); 1155 char* begin_ptr = char_buf; 1156 char* end_ptr = strchr(begin_ptr, '\n'); 1157 bool process_boot_modules = false; 1158 _boot_modules_array = new (ResourceObj::C_HEAP, mtModule) 1159 GrowableArray<char*>(INITIAL_BOOT_MODULES_ARRAY_SIZE, true); 1160 _platform_modules_array = new (ResourceObj::C_HEAP, mtModule) 1161 GrowableArray<char*>(INITIAL_PLATFORM_MODULES_ARRAY_SIZE, true); 1162 while (end_ptr != NULL && (end_ptr - char_buf) < buflen) { 1163 // Allocate a buffer from the C heap to be appended to the _boot_modules_array 1164 // or the _platform_modules_array. 1165 char* temp_name = NEW_C_HEAP_ARRAY(char, (size_t)(end_ptr - begin_ptr + 1), mtInternal); 1166 strncpy(temp_name, begin_ptr, end_ptr - begin_ptr); 1167 temp_name[end_ptr - begin_ptr] = '\0'; 1168 if (strncmp(temp_name, "BOOT", 4) == 0) { 1169 process_boot_modules = true; 1170 FREE_C_HEAP_ARRAY(char, temp_name); 1171 } else if (strncmp(temp_name, "PLATFORM", 8) == 0) { 1172 process_boot_modules = false; 1173 FREE_C_HEAP_ARRAY(char, temp_name); 1174 } else { 1175 // module name 1176 if (process_boot_modules) { 1177 _boot_modules_array->append(temp_name); 1178 } else { 1179 _platform_modules_array->append(temp_name); 1180 } 1181 } 1182 begin_ptr = ++end_ptr; 1183 end_ptr = strchr(begin_ptr, '\n'); 1184 } 1185 } 1186 #endif 1187 1188 // Function add_package extracts the package from the fully qualified class name 1189 // and checks if the package is in the boot loader's package entry table. If so, 1190 // then it sets the classpath_index in the package entry record. 1191 // 1192 // The classpath_index field is used to find the entry on the boot loader class 1193 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a 1194 // in an unnamed module. It is also used to indicate (for all packages whose 1195 // classes are loaded by the boot loader) that at least one of the package's 1196 // classes has been loaded. 1197 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) { 1198 assert(fullq_class_name != NULL, "just checking"); 1199 1200 // Get package name from fully qualified class name. 1201 ResourceMark rm; 1202 const char *cp = package_from_name(fullq_class_name); 1203 if (cp != NULL) { 1204 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages(); 1205 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false); 1206 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol); 1207 if (pkg_entry != NULL) { 1208 assert(classpath_index != -1, "Unexpected classpath_index"); 1209 pkg_entry->set_classpath_index(classpath_index); 1210 } else { 1211 return false; 1212 } 1213 } 1214 return true; 1215 } 1216 1217 oop ClassLoader::get_system_package(const char* name, TRAPS) { 1218 // Look up the name in the boot loader's package entry table. 1219 if (name != NULL) { 1220 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL); 1221 // Look for the package entry in the boot loader's package entry table. 1222 PackageEntry* package = 1223 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym); 1224 1225 // Return NULL if package does not exist or if no classes in that package 1226 // have been loaded. 1227 if (package != NULL && package->has_loaded_class()) { 1228 ModuleEntry* module = package->module(); 1229 if (module->location() != NULL) { 1230 ResourceMark rm(THREAD); 1231 Handle ml = java_lang_String::create_from_str( 1232 module->location()->as_C_string(), THREAD); 1233 return ml(); 1234 } 1235 // Return entry on boot loader class path. 1236 Handle cph = java_lang_String::create_from_str( 1237 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD); 1238 return cph(); 1239 } 1240 } 1241 return NULL; 1242 } 1243 1244 objArrayOop ClassLoader::get_system_packages(TRAPS) { 1245 ResourceMark rm(THREAD); 1246 // List of pointers to PackageEntrys that have loaded classes. 1247 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50); 1248 { 1249 MutexLocker ml(Module_lock, THREAD); 1250 1251 PackageEntryTable* pe_table = 1252 ClassLoaderData::the_null_class_loader_data()->packages(); 1253 1254 // Collect the packages that have at least one loaded class. 1255 for (int x = 0; x < pe_table->table_size(); x++) { 1256 for (PackageEntry* package_entry = pe_table->bucket(x); 1257 package_entry != NULL; 1258 package_entry = package_entry->next()) { 1259 if (package_entry->has_loaded_class()) { 1260 loaded_class_pkgs->append(package_entry); 1261 } 1262 } 1263 } 1264 } 1265 1266 1267 // Allocate objArray and fill with java.lang.String 1268 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), 1269 loaded_class_pkgs->length(), CHECK_NULL); 1270 objArrayHandle result(THREAD, r); 1271 for (int x = 0; x < loaded_class_pkgs->length(); x++) { 1272 PackageEntry* package_entry = loaded_class_pkgs->at(x); 1273 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL); 1274 result->obj_at_put(x, str()); 1275 } 1276 return result(); 1277 } 1278 1279 #if INCLUDE_CDS 1280 s2 ClassLoader::module_to_classloader(const char* module_name) { 1281 1282 assert(DumpSharedSpaces, "dump time only"); 1283 assert(_boot_modules_array != NULL, "_boot_modules_array is NULL"); 1284 assert(_platform_modules_array != NULL, "_platform_modules_array is NULL"); 1285 1286 int array_size = _boot_modules_array->length(); 1287 for (int i = 0; i < array_size; i++) { 1288 if (strcmp(module_name, _boot_modules_array->at(i)) == 0) { 1289 return BOOT_LOADER; 1290 } 1291 } 1292 1293 array_size = _platform_modules_array->length(); 1294 for (int i = 0; i < array_size; i++) { 1295 if (strcmp(module_name, _platform_modules_array->at(i)) == 0) { 1296 return PLATFORM_LOADER; 1297 } 1298 } 1299 1300 return APP_LOADER; 1301 } 1302 1303 s2 ClassLoader::classloader_type(Symbol* class_name, ClassPathEntry* e, int classpath_index, TRAPS) { 1304 assert(DumpSharedSpaces, "Only used for CDS dump time"); 1305 1306 // obtain the classloader type based on the class name. 1307 // First obtain the package name based on the class name. Then obtain 1308 // the classloader type based on the package name from the jimage using 1309 // a jimage API. If the classloader type cannot be found from the 1310 // jimage, it is determined by the class path entry. 1311 jshort loader_type = ClassLoader::APP_LOADER; 1312 if (e->is_jrt()) { 1313 ResourceMark rm; 1314 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK_0); 1315 if (pkg_name != NULL) { 1316 const char* pkg_name_C_string = (const char*)(pkg_name->as_C_string()); 1317 ClassPathImageEntry* cpie = (ClassPathImageEntry*)e; 1318 JImageFile* jimage = cpie->jimage(); 1319 char* module_name = (char*)(*JImagePackageToModule)(jimage, pkg_name_C_string); 1320 if (module_name != NULL) { 1321 loader_type = ClassLoader::module_to_classloader(module_name); 1322 } 1323 } 1324 } else if (ClassLoaderExt::is_boot_classpath(classpath_index)) { 1325 loader_type = ClassLoader::BOOT_LOADER; 1326 } 1327 return loader_type; 1328 } 1329 #endif 1330 1331 // caller needs ResourceMark 1332 const char* ClassLoader::file_name_for_class_name(const char* class_name, 1333 int class_name_len) { 1334 assert(class_name != NULL, "invariant"); 1335 assert((int)strlen(class_name) == class_name_len, "invariant"); 1336 1337 static const char class_suffix[] = ".class"; 1338 1339 char* const file_name = NEW_RESOURCE_ARRAY(char, 1340 class_name_len + 1341 sizeof(class_suffix)); // includes term NULL 1342 1343 strncpy(file_name, class_name, class_name_len); 1344 strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix)); 1345 1346 return file_name; 1347 } 1348 1349 // Search either the patch-module or exploded build entries for class 1350 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list, 1351 const char* const class_name, const char* const file_name, TRAPS) { 1352 ClassFileStream* stream = NULL; 1353 1354 // Find the class' defining module in the boot loader's module entry table 1355 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL); 1356 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL; 1357 1358 // If the module system has not defined java.base yet, then 1359 // classes loaded are assumed to be defined to java.base. 1360 // When java.base is eventually defined by the module system, 1361 // all packages of classes that have been previously loaded 1362 // are verified in ModuleEntryTable::verify_javabase_packages(). 1363 if (!Universe::is_module_initialized() && 1364 !ModuleEntryTable::javabase_defined() && 1365 mod_entry == NULL) { 1366 mod_entry = ModuleEntryTable::javabase_moduleEntry(); 1367 } 1368 1369 // The module must be a named module 1370 if (mod_entry != NULL && mod_entry->is_named()) { 1371 int num_of_entries = module_list->length(); 1372 const Symbol* class_module_name = mod_entry->name(); 1373 1374 // Loop through all the modules in either the patch-module or exploded entries looking for module 1375 for (int i = 0; i < num_of_entries; i++) { 1376 ModuleClassPathList* module_cpl = module_list->at(i); 1377 Symbol* module_cpl_name = module_cpl->module_name(); 1378 1379 if (module_cpl_name->fast_compare(class_module_name) == 0) { 1380 // Class' module has been located, attempt to load 1381 // the class from the module's ClassPathEntry list. 1382 ClassPathEntry* e = module_cpl->module_first_entry(); 1383 while (e != NULL) { 1384 stream = e->open_stream(file_name, CHECK_NULL); 1385 // No context.check is required since CDS is not supported 1386 // for an exploded modules build or if --patch-module is specified. 1387 if (NULL != stream) { 1388 return stream; 1389 } 1390 e = e->next(); 1391 } 1392 // If the module was located, break out even if the class was not 1393 // located successfully from that module's ClassPathEntry list. 1394 // There will not be another valid entry for that module. 1395 return NULL; 1396 } 1397 } 1398 } 1399 1400 return NULL; 1401 } 1402 1403 instanceKlassHandle ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) { 1404 assert(name != NULL, "invariant"); 1405 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 1406 1407 ResourceMark rm(THREAD); 1408 HandleMark hm(THREAD); 1409 1410 const char* const class_name = name->as_C_string(); 1411 1412 EventMark m("loading class %s", class_name); 1413 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion); 1414 1415 const char* const file_name = file_name_for_class_name(class_name, 1416 name->utf8_length()); 1417 assert(file_name != NULL, "invariant"); 1418 1419 ClassLoaderExt::Context context(class_name, file_name, THREAD); 1420 1421 // Lookup stream for parsing .class file 1422 ClassFileStream* stream = NULL; 1423 s2 classpath_index = 0; 1424 ClassPathEntry* e = NULL; 1425 1426 // If DumpSharedSpaces is true boot loader visibility boundaries are set to: 1427 // - [jimage] + [_first_append_entry to _last_append_entry] (all path entries). 1428 // 1429 // If search_append_only is true, boot loader visibility boundaries are 1430 // set to be _first_append_entry to the end. This includes: 1431 // [-Xbootclasspath/a]; [jvmti appended entries] 1432 // 1433 // If both DumpSharedSpaces and search_append_only are false, boot loader 1434 // visibility boundaries are set to be the --patch-module entries plus the base piece. 1435 // This would include: 1436 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build] 1437 // 1438 // DumpSharedSpaces and search_append_only are mutually exclusive and cannot 1439 // be true at the same time. 1440 assert(!(DumpSharedSpaces && search_append_only), "DumpSharedSpaces and search_append_only are both true"); 1441 1442 // Load Attempt #1: --patch-module 1443 // Determine the class' defining module. If it appears in the _patch_mod_entries, 1444 // attempt to load the class from those locations specific to the module. 1445 // Specifications to --patch-module can contain a partial number of classes 1446 // that are part of the overall module definition. So if a particular class is not 1447 // found within its module specification, the search should continue to Load Attempt #2. 1448 // Note: The --patch-module entries are never searched if the boot loader's 1449 // visibility boundary is limited to only searching the append entries. 1450 if (_patch_mod_entries != NULL && !search_append_only) { 1451 // At CDS dump time, the --patch-module entries are ignored. That means a 1452 // class is still loaded from the [jimage|exploded build] even if it might 1453 // appear in the _patch_mod_entries. The runtime shared class visibility 1454 // check will determine if a shared class is visible based on the runtime 1455 // environemnt, including the runtime --patch-module setting. 1456 if (!DumpSharedSpaces) { 1457 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL); 1458 } 1459 } 1460 1461 // Load Attempt #2: [jimage | exploded build] 1462 if (!search_append_only && (NULL == stream)) { 1463 if (has_jrt_entry()) { 1464 e = _jrt_entry; 1465 stream = _jrt_entry->open_stream(file_name, CHECK_NULL); 1466 if (!context.check(stream, classpath_index)) { 1467 return NULL; 1468 } 1469 } else { 1470 // Exploded build - attempt to locate class in its defining module's location. 1471 assert(_exploded_entries != NULL, "No exploded build entries present"); 1472 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL); 1473 } 1474 } 1475 1476 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries] 1477 if ((search_append_only || DumpSharedSpaces) && (NULL == stream)) { 1478 // For the boot loader append path search, the starting classpath_index 1479 // for the appended piece is always 1 to account for either the 1480 // _jrt_entry or the _exploded_entries. 1481 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly"); 1482 classpath_index = 1; 1483 1484 e = _first_append_entry; 1485 while (e != NULL) { 1486 stream = e->open_stream(file_name, CHECK_NULL); 1487 if (!context.check(stream, classpath_index)) { 1488 return NULL; 1489 } 1490 if (NULL != stream) { 1491 break; 1492 } 1493 e = e->next(); 1494 ++classpath_index; 1495 } 1496 } 1497 1498 if (NULL == stream) { 1499 if (DumpSharedSpaces) { 1500 tty->print_cr("Preload Warning: Cannot find %s", class_name); 1501 } 1502 return NULL; 1503 } 1504 1505 stream->set_verify(context.should_verify(classpath_index)); 1506 1507 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 1508 Handle protection_domain; 1509 1510 instanceKlassHandle result = KlassFactory::create_from_stream(stream, 1511 name, 1512 loader_data, 1513 protection_domain, 1514 NULL, // host_klass 1515 NULL, // cp_patches 1516 THREAD); 1517 if (HAS_PENDING_EXCEPTION) { 1518 if (DumpSharedSpaces) { 1519 tty->print_cr("Preload Error: Failed to load %s", class_name); 1520 } 1521 return NULL; 1522 } 1523 1524 return context.record_result(name, e, classpath_index, result, THREAD); 1525 } 1526 1527 // Initialize the class loader's access to methods in libzip. Parse and 1528 // process the boot classpath into a list ClassPathEntry objects. Once 1529 // this list has been created, it must not change order (see class PackageInfo) 1530 // it can be appended to and is by jvmti and the kernel vm. 1531 1532 void ClassLoader::initialize() { 1533 EXCEPTION_MARK; 1534 1535 if (UsePerfData) { 1536 // jvmstat performance counters 1537 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time"); 1538 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime"); 1539 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self"); 1540 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime"); 1541 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self"); 1542 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime"); 1543 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self"); 1544 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses"); 1545 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses"); 1546 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses"); 1547 1548 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime"); 1549 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self"); 1550 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime"); 1551 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime"); 1552 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime"); 1553 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime"); 1554 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self"); 1555 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount"); 1556 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses"); 1557 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime"); 1558 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self"); 1559 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes"); 1560 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes"); 1561 1562 1563 // The following performance counters are added for measuring the impact 1564 // of the bug fix of 6365597. They are mainly focused on finding out 1565 // the behavior of system & user-defined classloader lock, whether 1566 // ClassLoader.loadClass/findClass is being called synchronized or not. 1567 // Also two additional counters are created to see whether 'UnsyncloadClass' 1568 // flag is being set or not and how many times load_instance_class call 1569 // fails with linkageError etc. 1570 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS, 1571 "systemLoaderLockContentionRate"); 1572 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS, 1573 "nonSystemLoaderLockContentionRate"); 1574 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS, 1575 "jvmFindLoadedClassNoLockCalls"); 1576 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS, 1577 "jvmDefineClassNoLockCalls"); 1578 1579 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS, 1580 "jniDefineClassNoLockCalls"); 1581 1582 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, 1583 "unsafeDefineClassCalls"); 1584 1585 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet"); 1586 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS, 1587 "loadInstanceClassFailRate"); 1588 1589 // increment the isUnsyncloadClass counter if UnsyncloadClass is set. 1590 if (UnsyncloadClass) { 1591 _isUnsyncloadClass->inc(); 1592 } 1593 } 1594 1595 // lookup zip library entry points 1596 load_zip_library(); 1597 // lookup jimage library entry points 1598 load_jimage_library(); 1599 #if INCLUDE_CDS 1600 // initialize search path 1601 if (DumpSharedSpaces) { 1602 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info(); 1603 } 1604 #endif 1605 setup_bootstrap_search_path(); 1606 } 1607 1608 #if INCLUDE_CDS 1609 void ClassLoader::initialize_shared_path() { 1610 if (DumpSharedSpaces) { 1611 ClassLoaderExt::setup_search_paths(); 1612 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check() 1613 } 1614 } 1615 #endif 1616 1617 jlong ClassLoader::classloader_time_ms() { 1618 return UsePerfData ? 1619 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1; 1620 } 1621 1622 jlong ClassLoader::class_init_count() { 1623 return UsePerfData ? _perf_classes_inited->get_value() : -1; 1624 } 1625 1626 jlong ClassLoader::class_init_time_ms() { 1627 return UsePerfData ? 1628 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1; 1629 } 1630 1631 jlong ClassLoader::class_verify_time_ms() { 1632 return UsePerfData ? 1633 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1; 1634 } 1635 1636 jlong ClassLoader::class_link_count() { 1637 return UsePerfData ? _perf_classes_linked->get_value() : -1; 1638 } 1639 1640 jlong ClassLoader::class_link_time_ms() { 1641 return UsePerfData ? 1642 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1; 1643 } 1644 1645 int ClassLoader::compute_Object_vtable() { 1646 // hardwired for JDK1.2 -- would need to duplicate class file parsing 1647 // code to determine actual value from file 1648 // Would be value '11' if finals were in vtable 1649 int JDK_1_2_Object_vtable_size = 5; 1650 return JDK_1_2_Object_vtable_size * vtableEntry::size(); 1651 } 1652 1653 1654 void classLoader_init1() { 1655 ClassLoader::initialize(); 1656 } 1657 1658 // Complete the ClassPathEntry setup for the boot loader 1659 void ClassLoader::classLoader_init2(TRAPS) { 1660 // Setup the list of module/path pairs for --patch-module processing 1661 // This must be done after the SymbolTable is created in order 1662 // to use fast_compare on module names instead of a string compare. 1663 if (Arguments::get_patch_mod_prefix() != NULL) { 1664 setup_patch_mod_entries(); 1665 } 1666 1667 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries 1668 // to successfully determine if java.base has been patched) 1669 create_javabase(); 1670 1671 // Setup the initial java.base/path pair for the exploded build entries. 1672 // As more modules are defined during module system initialization, more 1673 // entries will be added to the exploded build array. 1674 if (!has_jrt_entry()) { 1675 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds"); 1676 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds"); 1677 add_to_exploded_build_list(vmSymbols::java_base(), CHECK); 1678 } 1679 } 1680 1681 1682 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) { 1683 assert(orig != NULL && out != NULL && len > 0, "bad arguments"); 1684 if (CanonicalizeEntry != NULL) { 1685 JavaThread* THREAD = JavaThread::current(); 1686 JNIEnv* env = THREAD->jni_environment(); 1687 ResourceMark rm(THREAD); 1688 1689 // os::native_path writes into orig_copy 1690 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1); 1691 strcpy(orig_copy, orig); 1692 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) { 1693 return false; 1694 } 1695 } else { 1696 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing 1697 strncpy(out, orig, len); 1698 out[len - 1] = '\0'; 1699 } 1700 return true; 1701 } 1702 1703 void ClassLoader::create_javabase() { 1704 Thread* THREAD = Thread::current(); 1705 1706 // Create java.base's module entry for the boot 1707 // class loader prior to loading j.l.Ojbect. 1708 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 1709 1710 // Get module entry table 1711 ModuleEntryTable* null_cld_modules = null_cld->modules(); 1712 if (null_cld_modules == NULL) { 1713 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader"); 1714 } 1715 1716 { 1717 MutexLocker ml(Module_lock, THREAD); 1718 ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(NULL), vmSymbols::java_base(), NULL, NULL, null_cld); 1719 if (jb_module == NULL) { 1720 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME); 1721 } 1722 ModuleEntryTable::set_javabase_moduleEntry(jb_module); 1723 } 1724 } 1725 1726 #ifndef PRODUCT 1727 1728 // CompileTheWorld 1729 // 1730 // Iterates over all class path entries and forces compilation of all methods 1731 // in all classes found. Currently, only zip/jar archives are searched. 1732 // 1733 // The classes are loaded by the Java level bootstrap class loader, and the 1734 // initializer is called. If DelayCompilationDuringStartup is true (default), 1735 // the interpreter will run the initialization code. Note that forcing 1736 // initialization in this way could potentially lead to initialization order 1737 // problems, in which case we could just force the initialization bit to be set. 1738 1739 1740 // We need to iterate over the contents of a zip/jar file, so we replicate the 1741 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile, 1742 // since jzfile already has a void* definition. 1743 // 1744 // Note that this is only used in debug mode. 1745 // 1746 // HotSpot integration note: 1747 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build 1748 1749 1750 // JDK 1.3 version 1751 typedef struct real_jzentry { /* Zip file entry */ 1752 char *name; /* entry name */ 1753 jint time; /* modification time */ 1754 jint size; /* size of uncompressed data */ 1755 jint csize; /* size of compressed data (zero if uncompressed) */ 1756 jint crc; /* crc of uncompressed data */ 1757 char *comment; /* optional zip file comment */ 1758 jbyte *extra; /* optional extra data */ 1759 jint pos; /* position of LOC header (if negative) or data */ 1760 } real_jzentry; 1761 1762 typedef struct real_jzfile { /* Zip file */ 1763 char *name; /* zip file name */ 1764 jint refs; /* number of active references */ 1765 jint fd; /* open file descriptor */ 1766 void *lock; /* read lock */ 1767 char *comment; /* zip file comment */ 1768 char *msg; /* zip error message */ 1769 void *entries; /* array of hash cells */ 1770 jint total; /* total number of entries */ 1771 unsigned short *table; /* Hash chain heads: indexes into entries */ 1772 jint tablelen; /* number of hash eads */ 1773 real_jzfile *next; /* next zip file in search list */ 1774 jzentry *cache; /* we cache the most recently freed jzentry */ 1775 /* Information on metadata names in META-INF directory */ 1776 char **metanames; /* array of meta names (may have null names) */ 1777 jint metacount; /* number of slots in metanames array */ 1778 /* If there are any per-entry comments, they are in the comments array */ 1779 char **comments; 1780 } real_jzfile; 1781 1782 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) { 1783 // For now we only compile all methods in all classes in zip/jar files 1784 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir); 1785 tty->cr(); 1786 } 1787 1788 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) { 1789 real_jzfile* zip = (real_jzfile*) _zip; 1790 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name); 1791 tty->cr(); 1792 // Iterate over all entries in zip file 1793 for (int n = 0; ; n++) { 1794 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n)); 1795 if (ze == NULL) break; 1796 ClassLoader::compile_the_world_in(ze->name, loader, CHECK); 1797 } 1798 if (HAS_PENDING_EXCEPTION) { 1799 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1800 CLEAR_PENDING_EXCEPTION; 1801 tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); 1802 tty->print_cr("Increase class metadata storage if a limit was set"); 1803 } else { 1804 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); 1805 } 1806 } 1807 } 1808 1809 void ClassLoader::compile_the_world() { 1810 EXCEPTION_MARK; 1811 HandleMark hm(THREAD); 1812 ResourceMark rm(THREAD); 1813 1814 assert(has_jrt_entry(), "Compile The World not supported with exploded module build"); 1815 1816 // Find bootstrap loader 1817 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader()); 1818 jlong start = os::javaTimeMillis(); 1819 1820 // Compile the world for the modular java runtime image 1821 _jrt_entry->compile_the_world(system_class_loader, CATCH); 1822 1823 // Iterate over all bootstrap class path appended entries 1824 ClassPathEntry* e = _first_append_entry; 1825 while (e != NULL) { 1826 assert(!e->is_jrt(), "A modular java runtime image is present on the list of appended entries"); 1827 e->compile_the_world(system_class_loader, CATCH); 1828 e = e->next(); 1829 } 1830 jlong end = os::javaTimeMillis(); 1831 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)", 1832 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start)); 1833 { 1834 // Print statistics as if before normal exit: 1835 extern void print_statistics(); 1836 print_statistics(); 1837 } 1838 vm_exit(0); 1839 } 1840 1841 int ClassLoader::_compile_the_world_class_counter = 0; 1842 int ClassLoader::_compile_the_world_method_counter = 0; 1843 static int _codecache_sweep_counter = 0; 1844 1845 // Filter out all exceptions except OOMs 1846 static void clear_pending_exception_if_not_oom(TRAPS) { 1847 if (HAS_PENDING_EXCEPTION && 1848 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1849 CLEAR_PENDING_EXCEPTION; 1850 } 1851 // The CHECK at the caller will propagate the exception out 1852 } 1853 1854 /** 1855 * Returns if the given method should be compiled when doing compile-the-world. 1856 * 1857 * TODO: This should be a private method in a CompileTheWorld class. 1858 */ 1859 static bool can_be_compiled(methodHandle m, int comp_level) { 1860 assert(CompileTheWorld, "must be"); 1861 1862 // It's not valid to compile a native wrapper for MethodHandle methods 1863 // that take a MemberName appendix since the bytecode signature is not 1864 // correct. 1865 vmIntrinsics::ID iid = m->intrinsic_id(); 1866 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) { 1867 return false; 1868 } 1869 1870 return CompilationPolicy::can_be_compiled(m, comp_level); 1871 } 1872 1873 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) { 1874 if (string_ends_with(name, ".class")) { 1875 // We have a .class file 1876 int len = (int)strlen(name); 1877 char buffer[2048]; 1878 strncpy(buffer, name, len - 6); 1879 buffer[len-6] = 0; 1880 // If the file has a period after removing .class, it's not really a 1881 // valid class file. The class loader will check everything else. 1882 if (strchr(buffer, '.') == NULL) { 1883 _compile_the_world_class_counter++; 1884 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return; 1885 1886 // Construct name without extension 1887 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK); 1888 // Use loader to load and initialize class 1889 Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD); 1890 instanceKlassHandle k (THREAD, ik); 1891 if (k.not_null() && !HAS_PENDING_EXCEPTION) { 1892 k->initialize(THREAD); 1893 } 1894 bool exception_occurred = HAS_PENDING_EXCEPTION; 1895 clear_pending_exception_if_not_oom(CHECK); 1896 if (CompileTheWorldPreloadClasses && k.not_null()) { 1897 ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD); 1898 if (HAS_PENDING_EXCEPTION) { 1899 // If something went wrong in preloading we just ignore it 1900 clear_pending_exception_if_not_oom(CHECK); 1901 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer); 1902 } 1903 } 1904 1905 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) { 1906 if (k.is_null() || exception_occurred) { 1907 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class 1908 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer); 1909 } else { 1910 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer); 1911 // Preload all classes to get around uncommon traps 1912 // Iterate over all methods in class 1913 int comp_level = CompilationPolicy::policy()->initial_compile_level(); 1914 for (int n = 0; n < k->methods()->length(); n++) { 1915 methodHandle m (THREAD, k->methods()->at(n)); 1916 if (can_be_compiled(m, comp_level)) { 1917 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) { 1918 // Give sweeper a chance to keep up with CTW 1919 VM_ForceSafepoint op; 1920 VMThread::execute(&op); 1921 _codecache_sweep_counter = 0; 1922 } 1923 // Force compilation 1924 CompileBroker::compile_method(m, InvocationEntryBci, comp_level, 1925 methodHandle(), 0, CompileTask::Reason_CTW, THREAD); 1926 if (HAS_PENDING_EXCEPTION) { 1927 clear_pending_exception_if_not_oom(CHECK); 1928 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1929 } else { 1930 _compile_the_world_method_counter++; 1931 } 1932 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) { 1933 // Clobber the first compile and force second tier compilation 1934 CompiledMethod* nm = m->code(); 1935 if (nm != NULL && !m->is_method_handle_intrinsic()) { 1936 // Throw out the code so that the code cache doesn't fill up 1937 nm->make_not_entrant(); 1938 } 1939 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization, 1940 methodHandle(), 0, CompileTask::Reason_CTW, THREAD); 1941 if (HAS_PENDING_EXCEPTION) { 1942 clear_pending_exception_if_not_oom(CHECK); 1943 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1944 } else { 1945 _compile_the_world_method_counter++; 1946 } 1947 } 1948 } else { 1949 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1950 } 1951 1952 CompiledMethod* nm = m->code(); 1953 if (nm != NULL && !m->is_method_handle_intrinsic()) { 1954 // Throw out the code so that the code cache doesn't fill up 1955 nm->make_not_entrant(); 1956 } 1957 } 1958 } 1959 } 1960 } 1961 } 1962 } 1963 1964 #endif //PRODUCT 1965 1966 // Please keep following two functions at end of this file. With them placed at top or in middle of the file, 1967 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589. 1968 void PerfClassTraceTime::initialize() { 1969 if (!UsePerfData) return; 1970 1971 if (_eventp != NULL) { 1972 // increment the event counter 1973 _eventp->inc(); 1974 } 1975 1976 // stop the current active thread-local timer to measure inclusive time 1977 _prev_active_event = -1; 1978 for (int i=0; i < EVENT_TYPE_COUNT; i++) { 1979 if (_timers[i].is_active()) { 1980 assert(_prev_active_event == -1, "should have only one active timer"); 1981 _prev_active_event = i; 1982 _timers[i].stop(); 1983 } 1984 } 1985 1986 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) { 1987 // start the inclusive timer if not recursively called 1988 _t.start(); 1989 } 1990 1991 // start thread-local timer of the given event type 1992 if (!_timers[_event_type].is_active()) { 1993 _timers[_event_type].start(); 1994 } 1995 } 1996 1997 PerfClassTraceTime::~PerfClassTraceTime() { 1998 if (!UsePerfData) return; 1999 2000 // stop the thread-local timer as the event completes 2001 // and resume the thread-local timer of the event next on the stack 2002 _timers[_event_type].stop(); 2003 jlong selftime = _timers[_event_type].ticks(); 2004 2005 if (_prev_active_event >= 0) { 2006 _timers[_prev_active_event].start(); 2007 } 2008 2009 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return; 2010 2011 // increment the counters only on the leaf call 2012 _t.stop(); 2013 _timep->inc(_t.ticks()); 2014 if (_selftimep != NULL) { 2015 _selftimep->inc(selftime); 2016 } 2017 // add all class loading related event selftime to the accumulated time counter 2018 ClassLoader::perf_accumulated_time()->inc(selftime); 2019 2020 // reset the timer 2021 _timers[_event_type].reset(); 2022 }