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 jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf); 85 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n); 86 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg); 87 typedef jint (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len); 88 89 static ZipOpen_t ZipOpen = NULL; 90 static ZipClose_t ZipClose = NULL; 91 static FindEntry_t FindEntry = NULL; 92 static ReadEntry_t ReadEntry = NULL; 93 static ReadMappedEntry_t ReadMappedEntry = NULL; 94 static GetNextEntry_t GetNextEntry = NULL; 95 static canonicalize_fn_t CanonicalizeEntry = NULL; 96 static ZipInflateFully_t ZipInflateFully = NULL; 97 static Crc32_t Crc32 = NULL; 98 99 // Entry points for jimage.dll for loading jimage file entries 100 101 static JImageOpen_t JImageOpen = NULL; 102 static JImageClose_t JImageClose = NULL; 103 static JImagePackageToModule_t JImagePackageToModule = NULL; 104 static JImageFindResource_t JImageFindResource = NULL; 105 static JImageGetResource_t JImageGetResource = NULL; 106 static JImageResourceIterator_t JImageResourceIterator = NULL; 107 static JImage_ResourcePath_t JImageResourcePath = NULL; 108 109 // Globals 110 111 PerfCounter* ClassLoader::_perf_accumulated_time = NULL; 112 PerfCounter* ClassLoader::_perf_classes_inited = NULL; 113 PerfCounter* ClassLoader::_perf_class_init_time = NULL; 114 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL; 115 PerfCounter* ClassLoader::_perf_classes_verified = NULL; 116 PerfCounter* ClassLoader::_perf_class_verify_time = NULL; 117 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL; 118 PerfCounter* ClassLoader::_perf_classes_linked = NULL; 119 PerfCounter* ClassLoader::_perf_class_link_time = NULL; 120 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL; 121 PerfCounter* ClassLoader::_perf_class_parse_time = NULL; 122 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL; 123 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL; 124 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL; 125 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL; 126 PerfCounter* ClassLoader::_perf_app_classload_time = NULL; 127 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL; 128 PerfCounter* ClassLoader::_perf_app_classload_count = NULL; 129 PerfCounter* ClassLoader::_perf_define_appclasses = NULL; 130 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL; 131 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL; 132 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL; 133 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL; 134 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL; 135 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL; 136 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL; 137 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL; 138 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL; 139 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL; 140 PerfCounter* ClassLoader::_isUnsyncloadClass = NULL; 141 PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL; 142 143 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL; 144 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL; 145 ClassPathEntry* ClassLoader::_jrt_entry = NULL; 146 ClassPathEntry* ClassLoader::_first_append_entry = NULL; 147 ClassPathEntry* ClassLoader::_last_append_entry = NULL; 148 int ClassLoader::_num_entries = 0; 149 #if INCLUDE_CDS 150 GrowableArray<char*>* ClassLoader::_boot_modules_array = NULL; 151 GrowableArray<char*>* ClassLoader::_platform_modules_array = NULL; 152 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL; 153 #endif 154 155 // helper routines 156 bool string_starts_with(const char* str, const char* str_to_find) { 157 size_t str_len = strlen(str); 158 size_t str_to_find_len = strlen(str_to_find); 159 if (str_to_find_len > str_len) { 160 return false; 161 } 162 return (strncmp(str, str_to_find, str_to_find_len) == 0); 163 } 164 165 static const char* get_jimage_version_string() { 166 static char version_string[10] = ""; 167 if (version_string[0] == '\0') { 168 jio_snprintf(version_string, sizeof(version_string), "%d.%d", 169 Abstract_VM_Version::vm_major_version(), Abstract_VM_Version::vm_minor_version()); 170 } 171 return (const char*)version_string; 172 } 173 174 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) { 175 size_t str_len = strlen(str); 176 size_t str_to_find_len = strlen(str_to_find); 177 if (str_to_find_len > str_len) { 178 return false; 179 } 180 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0); 181 } 182 183 // Used to obtain the package name from a fully qualified class name. 184 // It is the responsibility of the caller to establish a ResourceMark. 185 const char* ClassLoader::package_from_name(const char* const class_name, bool* bad_class_name) { 186 if (class_name == NULL) { 187 if (bad_class_name != NULL) { 188 *bad_class_name = true; 189 } 190 return NULL; 191 } 192 193 if (bad_class_name != NULL) { 194 *bad_class_name = false; 195 } 196 197 const char* const last_slash = strrchr(class_name, '/'); 198 if (last_slash == NULL) { 199 // No package name 200 return NULL; 201 } 202 203 char* class_name_ptr = (char*) class_name; 204 // Skip over '['s 205 if (*class_name_ptr == '[') { 206 do { 207 class_name_ptr++; 208 } while (*class_name_ptr == '['); 209 210 // Fully qualified class names should not contain a 'L'. 211 // Set bad_class_name to true to indicate that the package name 212 // could not be obtained due to an error condition. 213 // In this situation, is_same_class_package returns false. 214 if (*class_name_ptr == 'L') { 215 if (bad_class_name != NULL) { 216 *bad_class_name = true; 217 } 218 return NULL; 219 } 220 } 221 222 int length = last_slash - class_name_ptr; 223 224 // A class name could have just the slash character in the name. 225 if (length <= 0) { 226 // No package name 227 if (bad_class_name != NULL) { 228 *bad_class_name = true; 229 } 230 return NULL; 231 } 232 233 // drop name after last slash (including slash) 234 // Ex., "java/lang/String.class" => "java/lang" 235 char* pkg_name = NEW_RESOURCE_ARRAY(char, length + 1); 236 strncpy(pkg_name, class_name_ptr, length); 237 *(pkg_name+length) = '\0'; 238 239 return (const char *)pkg_name; 240 } 241 242 // Given a fully qualified class name, find its defining package in the class loader's 243 // package entry table. 244 static PackageEntry* get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS) { 245 ResourceMark rm(THREAD); 246 const char *pkg_name = ClassLoader::package_from_name(class_name); 247 if (pkg_name == NULL) { 248 return NULL; 249 } 250 PackageEntryTable* pkgEntryTable = loader_data->packages(); 251 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(pkg_name, CHECK_NULL); 252 return pkgEntryTable->lookup_only(pkg_symbol); 253 } 254 255 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() { 256 char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass); 257 strcpy(copy, dir); 258 _dir = copy; 259 } 260 261 262 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) { 263 // construct full path name 264 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN); 265 if (jio_snprintf(path, JVM_MAXPATHLEN, "%s%s%s", _dir, os::file_separator(), name) == -1) { 266 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN); 267 return NULL; 268 } 269 // check if file exists 270 struct stat st; 271 if (os::stat(path, &st) == 0) { 272 #if INCLUDE_CDS 273 if (DumpSharedSpaces) { 274 // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so 275 // we should never find a file underneath it -- unless user has added a new file while we are running 276 // the dump, in which case let's quit! 277 ShouldNotReachHere(); 278 } 279 #endif 280 // found file, open it 281 int file_handle = os::open(path, 0, 0); 282 if (file_handle != -1) { 283 // read contents into resource array 284 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size); 285 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size); 286 // close file 287 os::close(file_handle); 288 // construct ClassFileStream 289 if (num_read == (size_t)st.st_size) { 290 if (UsePerfData) { 291 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read); 292 } 293 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN); 294 // Resource allocated 295 return new ClassFileStream(buffer, 296 st.st_size, 297 _dir, 298 ClassFileStream::verify); 299 } 300 } 301 } 302 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN); 303 return NULL; 304 } 305 306 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() { 307 _zip = zip; 308 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass); 309 strcpy(copy, zip_name); 310 _zip_name = copy; 311 _is_boot_append = is_boot_append; 312 _multi_versioned = _unknown; 313 } 314 315 ClassPathZipEntry::~ClassPathZipEntry() { 316 if (ZipClose != NULL) { 317 (*ZipClose)(_zip); 318 } 319 FREE_C_HEAP_ARRAY(char, _zip_name); 320 } 321 322 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) { 323 // enable call to C land 324 JavaThread* thread = JavaThread::current(); 325 ThreadToNativeFromVM ttn(thread); 326 // check whether zip archive contains name 327 jint name_len; 328 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len); 329 if (entry == NULL) return NULL; 330 u1* buffer; 331 char name_buf[128]; 332 char* filename; 333 if (name_len < 128) { 334 filename = name_buf; 335 } else { 336 filename = NEW_RESOURCE_ARRAY(char, name_len + 1); 337 } 338 339 // file found, get pointer to the entry in mmapped jar file. 340 if (ReadMappedEntry == NULL || 341 !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) { 342 // mmapped access not available, perhaps due to compression, 343 // read contents into resource array 344 int size = (*filesize) + ((nul_terminate) ? 1 : 0); 345 buffer = NEW_RESOURCE_ARRAY(u1, size); 346 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL; 347 } 348 349 // return result 350 if (nul_terminate) { 351 buffer[*filesize] = 0; 352 } 353 return buffer; 354 } 355 356 #if INCLUDE_CDS 357 u1* ClassPathZipEntry::open_versioned_entry(const char* name, jint* filesize, TRAPS) { 358 u1* buffer = NULL; 359 if (DumpSharedSpaces && !_is_boot_append) { 360 // We presume default is multi-release enabled 361 const char* multi_ver = Arguments::get_property("jdk.util.jar.enableMultiRelease"); 362 const char* verstr = Arguments::get_property("jdk.util.jar.version"); 363 bool is_multi_ver = (multi_ver == NULL || 364 strcmp(multi_ver, "true") == 0 || 365 strcmp(multi_ver, "force") == 0) && 366 is_multiple_versioned(THREAD); 367 // command line version setting 368 int version = 0; 369 const int base_version = 8; // JDK8 370 int cur_ver = JDK_Version::current().major_version(); 371 if (verstr != NULL) { 372 version = atoi(verstr); 373 if (version < base_version || version > cur_ver) { 374 is_multi_ver = false; 375 // print out warning, do not use assertion here since it will continue to look 376 // for proper version. 377 warning("JDK%d is not supported in multiple version jars", version); 378 } 379 } 380 381 if (is_multi_ver) { 382 int n; 383 char* entry_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN); 384 if (version > 0) { 385 n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", version, name); 386 entry_name[n] = '\0'; 387 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL); 388 if (buffer == NULL) { 389 warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name); 390 } 391 } 392 if (buffer == NULL) { 393 for (int i = cur_ver; i >= base_version; i--) { 394 n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", i, name); 395 entry_name[n] = '\0'; 396 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL); 397 if (buffer != NULL) { 398 break; 399 } 400 } 401 } 402 FREE_RESOURCE_ARRAY(char, entry_name, JVM_MAXPATHLEN); 403 } 404 } 405 return buffer; 406 } 407 408 bool ClassPathZipEntry::is_multiple_versioned(TRAPS) { 409 assert(DumpSharedSpaces, "called only at dump time"); 410 if (_multi_versioned != _unknown) { 411 return (_multi_versioned == _yes) ? true : false; 412 } 413 jint size; 414 char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, true, CHECK_false); 415 if (buffer != NULL) { 416 char* p = buffer; 417 for ( ; *p; ++p) *p = tolower(*p); 418 if (strstr(buffer, "multi-release: true") != NULL) { 419 _multi_versioned = _yes; 420 return true; 421 } 422 } 423 _multi_versioned = _no; 424 return false; 425 } 426 #endif // INCLUDE_CDS 427 428 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) { 429 jint filesize; 430 u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL); 431 if (buffer == NULL) { 432 buffer = open_entry(name, &filesize, false, CHECK_NULL); 433 if (buffer == NULL) { 434 return NULL; 435 } 436 } 437 if (UsePerfData) { 438 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize); 439 } 440 // Resource allocated 441 return new ClassFileStream(buffer, 442 filesize, 443 _zip_name, 444 ClassFileStream::verify); 445 } 446 447 // invoke function for each entry in the zip file 448 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) { 449 JavaThread* thread = JavaThread::current(); 450 HandleMark handle_mark(thread); 451 ThreadToNativeFromVM ttn(thread); 452 for (int n = 0; ; n++) { 453 jzentry * ze = ((*GetNextEntry)(_zip, n)); 454 if (ze == NULL) break; 455 (*f)(ze->name, context); 456 } 457 } 458 459 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) : 460 ClassPathEntry(), 461 _jimage(jimage) { 462 guarantee(jimage != NULL, "jimage file is null"); 463 guarantee(name != NULL, "jimage file name is null"); 464 size_t len = strlen(name) + 1; 465 _name = NEW_C_HEAP_ARRAY(const char, len, mtClass); 466 strncpy((char *)_name, name, len); 467 } 468 469 ClassPathImageEntry::~ClassPathImageEntry() { 470 if (_name != NULL) { 471 FREE_C_HEAP_ARRAY(const char, _name); 472 _name = NULL; 473 } 474 if (_jimage != NULL) { 475 (*JImageClose)(_jimage); 476 _jimage = NULL; 477 } 478 } 479 480 // For a class in a named module, look it up in the jimage file using this syntax: 481 // /<module-name>/<package-name>/<base-class> 482 // 483 // Assumptions: 484 // 1. There are no unnamed modules in the jimage file. 485 // 2. A package is in at most one module in the jimage file. 486 // 487 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) { 488 jlong size; 489 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size); 490 491 if (location == 0) { 492 ResourceMark rm; 493 const char* pkg_name = ClassLoader::package_from_name(name); 494 495 if (pkg_name != NULL) { 496 if (!Universe::is_module_initialized()) { 497 location = (*JImageFindResource)(_jimage, "java.base", get_jimage_version_string(), name, &size); 498 #if INCLUDE_CDS 499 // CDS uses the boot class loader to load classes whose packages are in 500 // modules defined for other class loaders. So, for now, get their module 501 // names from the "modules" jimage file. 502 if (DumpSharedSpaces && location == 0) { 503 const char* module_name = (*JImagePackageToModule)(_jimage, pkg_name); 504 if (module_name != NULL) { 505 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size); 506 } 507 } 508 #endif 509 510 } else { 511 PackageEntry* package_entry = get_package_entry(name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL); 512 if (package_entry != NULL) { 513 ResourceMark rm; 514 // Get the module name 515 ModuleEntry* module = package_entry->module(); 516 assert(module != NULL, "Boot classLoader package missing module"); 517 assert(module->is_named(), "Boot classLoader package is in unnamed module"); 518 const char* module_name = module->name()->as_C_string(); 519 if (module_name != NULL) { 520 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size); 521 } 522 } 523 } 524 } 525 } 526 if (location != 0) { 527 if (UsePerfData) { 528 ClassLoader::perf_sys_classfile_bytes_read()->inc(size); 529 } 530 char* data = NEW_RESOURCE_ARRAY(char, size); 531 (*JImageGetResource)(_jimage, location, data, size); 532 // Resource allocated 533 return new ClassFileStream((u1*)data, 534 (int)size, 535 _name, 536 ClassFileStream::verify); 537 } 538 539 return NULL; 540 } 541 542 #ifndef PRODUCT 543 bool ctw_visitor(JImageFile* jimage, 544 const char* module_name, const char* version, const char* package, 545 const char* name, const char* extension, void* arg) { 546 if (strcmp(extension, "class") == 0) { 547 Thread* THREAD = Thread::current(); 548 ResourceMark rm(THREAD); 549 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JIMAGE_MAX_PATH); 550 jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name); 551 ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD); 552 return !HAS_PENDING_EXCEPTION; 553 } 554 return true; 555 } 556 557 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) { 558 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name()); 559 tty->cr(); 560 (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader); 561 if (HAS_PENDING_EXCEPTION) { 562 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 563 CLEAR_PENDING_EXCEPTION; 564 tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); 565 tty->print_cr("Increase class metadata storage if a limit was set"); 566 } else { 567 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); 568 } 569 } 570 } 571 #endif 572 573 bool ClassPathImageEntry::is_jrt() { 574 return ClassLoader::is_jrt(name()); 575 } 576 577 #if INCLUDE_CDS 578 void ClassLoader::exit_with_path_failure(const char* error, const char* message) { 579 assert(DumpSharedSpaces, "only called at dump time"); 580 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure"); 581 vm_exit_during_initialization(error, message); 582 } 583 #endif 584 585 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) { 586 _module_name = module_name; 587 _module_first_entry = NULL; 588 _module_last_entry = NULL; 589 } 590 591 ModuleClassPathList::~ModuleClassPathList() { 592 // Clean out each ClassPathEntry on list 593 ClassPathEntry* e = _module_first_entry; 594 while (e != NULL) { 595 ClassPathEntry* next_entry = e->next(); 596 delete e; 597 e = next_entry; 598 } 599 } 600 601 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) { 602 if (new_entry != NULL) { 603 if (_module_last_entry == NULL) { 604 _module_first_entry = _module_last_entry = new_entry; 605 } else { 606 _module_last_entry->set_next(new_entry); 607 _module_last_entry = new_entry; 608 } 609 } 610 } 611 612 void ClassLoader::trace_class_path(const char* msg, const char* name) { 613 if (log_is_enabled(Info, class, path)) { 614 ResourceMark rm; 615 outputStream* out = Log(class, path)::info_stream(); 616 if (msg) { 617 out->print("%s", msg); 618 } 619 if (name) { 620 if (strlen(name) < 256) { 621 out->print("%s", name); 622 } else { 623 // For very long paths, we need to print each character separately, 624 // as print_cr() has a length limit 625 while (name[0] != '\0') { 626 out->print("%c", name[0]); 627 name++; 628 } 629 } 630 } 631 out->cr(); 632 } 633 } 634 635 #if INCLUDE_CDS 636 void ClassLoader::check_shared_classpath(const char *path) { 637 if (strcmp(path, "") == 0) { 638 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL); 639 } 640 641 struct stat st; 642 if (os::stat(path, &st) == 0) { 643 if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory 644 if (!os::dir_is_empty(path)) { 645 tty->print_cr("Error: non-empty directory '%s'", path); 646 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL); 647 } 648 } 649 } 650 } 651 #endif 652 653 void ClassLoader::setup_bootstrap_search_path() { 654 const char* sys_class_path = Arguments::get_sysclasspath(); 655 const char* java_class_path = Arguments::get_appclasspath(); 656 if (PrintSharedArchiveAndExit) { 657 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily 658 // the same as the bootcp of the shared archive. 659 } else { 660 trace_class_path("bootstrap loader class path=", sys_class_path); 661 trace_class_path("classpath: ", java_class_path); 662 } 663 #if INCLUDE_CDS 664 if (DumpSharedSpaces) { 665 _shared_paths_misc_info->add_boot_classpath(sys_class_path); 666 } 667 #endif 668 setup_search_path(sys_class_path, true); 669 } 670 671 #if INCLUDE_CDS 672 int ClassLoader::get_shared_paths_misc_info_size() { 673 return _shared_paths_misc_info->get_used_bytes(); 674 } 675 676 void* ClassLoader::get_shared_paths_misc_info() { 677 return _shared_paths_misc_info->buffer(); 678 } 679 680 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) { 681 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size); 682 bool result = checker->check(); 683 delete checker; 684 return result; 685 } 686 #endif 687 688 // Construct the array of module/path pairs as specified to --patch-module 689 // for the boot loader to search ahead of the jimage, if the class being 690 // loaded is defined to a module that has been specified to --patch-module. 691 void ClassLoader::setup_patch_mod_entries() { 692 Thread* THREAD = Thread::current(); 693 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix(); 694 int num_of_entries = patch_mod_args->length(); 695 696 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with --patch-module"); 697 assert(!UseSharedSpaces, "UseSharedSpaces not supported with --patch-module"); 698 699 // Set up the boot loader's _patch_mod_entries list 700 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true); 701 702 for (int i = 0; i < num_of_entries; i++) { 703 const char* module_name = (patch_mod_args->at(i))->module_name(); 704 Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK); 705 assert(module_sym != NULL, "Failed to obtain Symbol for module name"); 706 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym); 707 708 char* class_path = (patch_mod_args->at(i))->path_string(); 709 int len = (int)strlen(class_path); 710 int end = 0; 711 // Iterate over the module's class path entries 712 for (int start = 0; start < len; start = end) { 713 while (class_path[end] && class_path[end] != os::path_separator()[0]) { 714 end++; 715 } 716 EXCEPTION_MARK; 717 ResourceMark rm(THREAD); 718 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1); 719 strncpy(path, &class_path[start], end - start); 720 path[end - start] = '\0'; 721 722 struct stat st; 723 if (os::stat(path, &st) == 0) { 724 // File or directory found 725 Thread* THREAD = Thread::current(); 726 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK); 727 // If the path specification is valid, enter it into this module's list 728 if (new_entry != NULL) { 729 module_cpl->add_to_list(new_entry); 730 } 731 } 732 733 while (class_path[end] == os::path_separator()[0]) { 734 end++; 735 } 736 } 737 738 // Record the module into the list of --patch-module entries only if 739 // valid ClassPathEntrys have been created 740 if (module_cpl->module_first_entry() != NULL) { 741 _patch_mod_entries->push(module_cpl); 742 } 743 } 744 } 745 746 void ClassLoader::setup_search_path(const char *class_path, bool bootstrap_search) { 747 int len = (int)strlen(class_path); 748 int end = 0; 749 bool set_base_piece = bootstrap_search; 750 751 // Iterate over class path entries 752 for (int start = 0; start < len; start = end) { 753 while (class_path[end] && class_path[end] != os::path_separator()[0]) { 754 end++; 755 } 756 EXCEPTION_MARK; 757 ResourceMark rm(THREAD); 758 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1); 759 strncpy(path, &class_path[start], end - start); 760 path[end - start] = '\0'; 761 762 // The first time through the bootstrap_search setup, it must be determined 763 // what the base or core piece of the boot loader search is. Either a java runtime 764 // image is present or this is an exploded module build situation. 765 if (set_base_piece) { 766 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, "java.base"), 767 "Incorrect boot loader search path, no java runtime image or java.base exploded build"); 768 struct stat st; 769 if (os::stat(path, &st) == 0) { 770 // Directory found 771 Thread* THREAD = Thread::current(); 772 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK); 773 774 // Check for a jimage 775 if (Arguments::has_jimage()) { 776 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice"); 777 assert(new_entry != NULL && new_entry->is_jrt(), "No java runtime image present"); 778 _jrt_entry = new_entry; 779 ++_num_entries; 780 #if INCLUDE_CDS 781 if (DumpSharedSpaces) { 782 JImageFile *jimage = _jrt_entry->jimage(); 783 assert(jimage != NULL, "No java runtime image file present"); 784 ClassLoader::initialize_module_loader_map(jimage); 785 } 786 #endif 787 } 788 } else { 789 // If path does not exist, exit 790 vm_exit_during_initialization("Unable to establish the boot loader search path", path); 791 } 792 set_base_piece = false; 793 } else { 794 // Every entry on the system boot class path after the initial base piece, 795 // which is set by os::set_boot_path(), is considered an appended entry. 796 update_class_path_entry_list(path, false, bootstrap_search); 797 } 798 799 #if INCLUDE_CDS 800 if (DumpSharedSpaces) { 801 check_shared_classpath(path); 802 } 803 #endif 804 while (class_path[end] == os::path_separator()[0]) { 805 end++; 806 } 807 } 808 } 809 810 // During an exploded modules build, each module defined to the boot loader 811 // will be added to the ClassLoader::_exploded_entries array. 812 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) { 813 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable"); 814 815 // Set up the boot loader's _exploded_entries list 816 if (_exploded_entries == NULL) { 817 _exploded_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true); 818 } 819 820 // Find the module's symbol 821 ResourceMark rm(THREAD); 822 const char *module_name = module_sym->as_C_string(); 823 const char *home = Arguments::get_java_home(); 824 const char file_sep = os::file_separator()[0]; 825 // 10 represents the length of "modules" + 2 file separators + \0 826 size_t len = strlen(home) + strlen(module_name) + 10; 827 char *path = NEW_C_HEAP_ARRAY(char, len, mtModule); 828 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name); 829 830 struct stat st; 831 if (os::stat(path, &st) == 0) { 832 // Directory found 833 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK); 834 835 // If the path specification is valid, enter it into this module's list. 836 // There is no need to check for duplicate modules in the exploded entry list, 837 // since no two modules with the same name can be defined to the boot loader. 838 // This is checked at module definition time in Modules::define_module. 839 if (new_entry != NULL) { 840 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym); 841 module_cpl->add_to_list(new_entry); 842 _exploded_entries->push(module_cpl); 843 log_info(class, load)("path: %s", path); 844 } 845 } 846 FREE_C_HEAP_ARRAY(char, path); 847 } 848 849 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st, 850 bool throw_exception, 851 bool is_boot_append, TRAPS) { 852 JavaThread* thread = JavaThread::current(); 853 ClassPathEntry* new_entry = NULL; 854 if ((st->st_mode & S_IFREG) == S_IFREG) { 855 ResourceMark rm(thread); 856 // Regular file, should be a zip or jimage file 857 // Canonicalized filename 858 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN); 859 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 860 // This matches the classic VM 861 if (throw_exception) { 862 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL); 863 } else { 864 return NULL; 865 } 866 } 867 jint error; 868 JImageFile* jimage =(*JImageOpen)(canonical_path, &error); 869 if (jimage != NULL) { 870 new_entry = new ClassPathImageEntry(jimage, canonical_path); 871 } else { 872 char* error_msg = NULL; 873 jzfile* zip; 874 { 875 // enable call to C land 876 ThreadToNativeFromVM ttn(thread); 877 HandleMark hm(thread); 878 zip = (*ZipOpen)(canonical_path, &error_msg); 879 } 880 if (zip != NULL && error_msg == NULL) { 881 new_entry = new ClassPathZipEntry(zip, path, is_boot_append); 882 } else { 883 char *msg; 884 if (error_msg == NULL) { 885 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ; 886 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path); 887 } else { 888 int len = (int)(strlen(path) + strlen(error_msg) + 128); 889 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ; 890 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path); 891 } 892 // Don't complain about bad jar files added via -Xbootclasspath/a:. 893 if (throw_exception && is_init_completed()) { 894 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL); 895 } else { 896 return NULL; 897 } 898 } 899 } 900 log_info(class, path)("opened: %s", path); 901 log_info(class, load)("opened: %s", path); 902 } else { 903 // Directory 904 new_entry = new ClassPathDirEntry(path); 905 log_info(class, load)("path: %s", path); 906 } 907 return new_entry; 908 } 909 910 911 // Create a class path zip entry for a given path (return NULL if not found 912 // or zip/JAR file cannot be opened) 913 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) { 914 // check for a regular file 915 struct stat st; 916 if (os::stat(path, &st) == 0) { 917 if ((st.st_mode & S_IFREG) == S_IFREG) { 918 char canonical_path[JVM_MAXPATHLEN]; 919 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 920 char* error_msg = NULL; 921 jzfile* zip; 922 { 923 // enable call to C land 924 JavaThread* thread = JavaThread::current(); 925 ThreadToNativeFromVM ttn(thread); 926 HandleMark hm(thread); 927 zip = (*ZipOpen)(canonical_path, &error_msg); 928 } 929 if (zip != NULL && error_msg == NULL) { 930 // create using canonical path 931 return new ClassPathZipEntry(zip, canonical_path, is_boot_append); 932 } 933 } 934 } 935 } 936 return NULL; 937 } 938 939 // returns true if entry already on class path 940 bool ClassLoader::contains_entry(ClassPathEntry *entry) { 941 ClassPathEntry* e = _first_append_entry; 942 while (e != NULL) { 943 // assume zip entries have been canonicalized 944 if (strcmp(entry->name(), e->name()) == 0) { 945 return true; 946 } 947 e = e->next(); 948 } 949 return false; 950 } 951 952 void ClassLoader::add_to_list(ClassPathEntry *new_entry) { 953 if (new_entry != NULL) { 954 if (_last_append_entry == NULL) { 955 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty"); 956 _first_append_entry = _last_append_entry = new_entry; 957 } else { 958 _last_append_entry->set_next(new_entry); 959 _last_append_entry = new_entry; 960 } 961 } 962 _num_entries++; 963 } 964 965 void ClassLoader::add_to_list(const char *apath) { 966 update_class_path_entry_list((char*)apath, false, false); 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 (!check_for_duplicates || !contains_entry(new_entry)) { 987 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry); 988 } 989 return true; 990 } else { 991 #if INCLUDE_CDS 992 if (DumpSharedSpaces) { 993 _shared_paths_misc_info->add_nonexist_path(path); 994 } 995 #endif 996 return false; 997 } 998 } 999 1000 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) { 1001 ResourceMark rm; 1002 int num_of_entries = module_list->length(); 1003 for (int i = 0; i < num_of_entries; i++) { 1004 ClassPathEntry* e; 1005 ModuleClassPathList* mpl = module_list->at(i); 1006 tty->print("%s=", mpl->module_name()->as_C_string()); 1007 e = mpl->module_first_entry(); 1008 while (e != NULL) { 1009 tty->print("%s", e->name()); 1010 e = e->next(); 1011 if (e != NULL) { 1012 tty->print("%s", os::path_separator()); 1013 } 1014 } 1015 tty->print(" ;"); 1016 } 1017 } 1018 1019 void ClassLoader::print_bootclasspath() { 1020 ClassPathEntry* e; 1021 tty->print("[bootclasspath= "); 1022 1023 // Print --patch-module module/path specifications first 1024 if (_patch_mod_entries != NULL) { 1025 print_module_entry_table(_patch_mod_entries); 1026 } 1027 1028 // [jimage | exploded modules build] 1029 if (has_jrt_entry()) { 1030 // Print the location of the java runtime image 1031 tty->print("%s ;", _jrt_entry->name()); 1032 } else { 1033 // Print exploded module build path specifications 1034 if (_exploded_entries != NULL) { 1035 print_module_entry_table(_exploded_entries); 1036 } 1037 } 1038 1039 // appended entries 1040 e = _first_append_entry; 1041 while (e != NULL) { 1042 tty->print("%s ;", e->name()); 1043 e = e->next(); 1044 } 1045 tty->print_cr("]"); 1046 } 1047 1048 void ClassLoader::load_zip_library() { 1049 assert(ZipOpen == NULL, "should not load zip library twice"); 1050 // First make sure native library is loaded 1051 os::native_java_library(); 1052 // Load zip library 1053 char path[JVM_MAXPATHLEN]; 1054 char ebuf[1024]; 1055 void* handle = NULL; 1056 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) { 1057 handle = os::dll_load(path, ebuf, sizeof ebuf); 1058 } 1059 if (handle == NULL) { 1060 vm_exit_during_initialization("Unable to load ZIP library", path); 1061 } 1062 // Lookup zip entry points 1063 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open")); 1064 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close")); 1065 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry")); 1066 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry")); 1067 ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry")); 1068 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry")); 1069 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully")); 1070 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32")); 1071 1072 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL 1073 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL || 1074 GetNextEntry == NULL || Crc32 == NULL) { 1075 vm_exit_during_initialization("Corrupted ZIP library", path); 1076 } 1077 1078 if (ZipInflateFully == NULL) { 1079 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path); 1080 } 1081 1082 // Lookup canonicalize entry in libjava.dll 1083 void *javalib_handle = os::native_java_library(); 1084 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize")); 1085 // This lookup only works on 1.3. Do not check for non-null here 1086 } 1087 1088 void ClassLoader::load_jimage_library() { 1089 // First make sure native library is loaded 1090 os::native_java_library(); 1091 // Load jimage library 1092 char path[JVM_MAXPATHLEN]; 1093 char ebuf[1024]; 1094 void* handle = NULL; 1095 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) { 1096 handle = os::dll_load(path, ebuf, sizeof ebuf); 1097 } 1098 if (handle == NULL) { 1099 vm_exit_during_initialization("Unable to load jimage library", path); 1100 } 1101 1102 // Lookup jimage entry points 1103 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open")); 1104 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found"); 1105 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close")); 1106 guarantee(JImageClose != NULL, "function JIMAGE_Close not found"); 1107 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule")); 1108 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found"); 1109 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource")); 1110 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found"); 1111 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource")); 1112 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found"); 1113 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator")); 1114 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found"); 1115 JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath")); 1116 guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found"); 1117 } 1118 1119 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) { 1120 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg); 1121 } 1122 1123 int ClassLoader::crc32(int crc, const char* buf, int len) { 1124 assert(Crc32 != NULL, "ZIP_CRC32 is not found"); 1125 return (*Crc32)(crc, (const jbyte*)buf, len); 1126 } 1127 1128 #if INCLUDE_CDS 1129 void ClassLoader::initialize_module_loader_map(JImageFile* jimage) { 1130 if (!DumpSharedSpaces) { 1131 return; // only needed for CDS dump time 1132 } 1133 1134 ResourceMark rm; 1135 jlong size; 1136 JImageLocationRef location = (*JImageFindResource)(jimage, "java.base", get_jimage_version_string(), MODULE_LOADER_MAP, &size); 1137 if (location == 0) { 1138 vm_exit_during_initialization( 1139 "Cannot find ModuleLoaderMap location from modules jimage.", NULL); 1140 } 1141 char* buffer = NEW_RESOURCE_ARRAY(char, size + 1); 1142 buffer[size] = '\0'; 1143 jlong read = (*JImageGetResource)(jimage, location, buffer, size); 1144 if (read != size) { 1145 vm_exit_during_initialization( 1146 "Cannot find ModuleLoaderMap resource from modules jimage.", NULL); 1147 } 1148 char* char_buf = (char*)buffer; 1149 int buflen = (int)strlen(char_buf); 1150 char* begin_ptr = char_buf; 1151 char* end_ptr = strchr(begin_ptr, '\n'); 1152 bool process_boot_modules = false; 1153 _boot_modules_array = new (ResourceObj::C_HEAP, mtModule) 1154 GrowableArray<char*>(INITIAL_BOOT_MODULES_ARRAY_SIZE, true); 1155 _platform_modules_array = new (ResourceObj::C_HEAP, mtModule) 1156 GrowableArray<char*>(INITIAL_PLATFORM_MODULES_ARRAY_SIZE, true); 1157 while (end_ptr != NULL && (end_ptr - char_buf) < buflen) { 1158 // Allocate a buffer from the C heap to be appended to the _boot_modules_array 1159 // or the _platform_modules_array. 1160 char* temp_name = NEW_C_HEAP_ARRAY(char, (size_t)(end_ptr - begin_ptr + 1), mtInternal); 1161 strncpy(temp_name, begin_ptr, end_ptr - begin_ptr); 1162 temp_name[end_ptr - begin_ptr] = '\0'; 1163 if (strncmp(temp_name, "BOOT", 4) == 0) { 1164 process_boot_modules = true; 1165 FREE_C_HEAP_ARRAY(char, temp_name); 1166 } else if (strncmp(temp_name, "PLATFORM", 8) == 0) { 1167 process_boot_modules = false; 1168 FREE_C_HEAP_ARRAY(char, temp_name); 1169 } else { 1170 // module name 1171 if (process_boot_modules) { 1172 _boot_modules_array->append(temp_name); 1173 } else { 1174 _platform_modules_array->append(temp_name); 1175 } 1176 } 1177 begin_ptr = ++end_ptr; 1178 end_ptr = strchr(begin_ptr, '\n'); 1179 } 1180 } 1181 #endif 1182 1183 // Function add_package extracts the package from the fully qualified class name 1184 // and checks if the package is in the boot loader's package entry table. If so, 1185 // then it sets the classpath_index in the package entry record. 1186 // 1187 // The classpath_index field is used to find the entry on the boot loader class 1188 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a 1189 // in an unnamed module. It is also used to indicate (for all packages whose 1190 // classes are loaded by the boot loader) that at least one of the package's 1191 // classes has been loaded. 1192 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) { 1193 assert(fullq_class_name != NULL, "just checking"); 1194 1195 // Get package name from fully qualified class name. 1196 ResourceMark rm; 1197 const char *cp = package_from_name(fullq_class_name); 1198 if (cp != NULL) { 1199 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages(); 1200 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false); 1201 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol); 1202 if (pkg_entry != NULL) { 1203 assert(classpath_index != -1, "Unexpected classpath_index"); 1204 pkg_entry->set_classpath_index(classpath_index); 1205 } else { 1206 return false; 1207 } 1208 } 1209 return true; 1210 } 1211 1212 oop ClassLoader::get_system_package(const char* name, TRAPS) { 1213 // Look up the name in the boot loader's package entry table. 1214 if (name != NULL) { 1215 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL); 1216 // Look for the package entry in the boot loader's package entry table. 1217 PackageEntry* package = 1218 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym); 1219 1220 // Return NULL if package does not exist or if no classes in that package 1221 // have been loaded. 1222 if (package != NULL && package->has_loaded_class()) { 1223 ModuleEntry* module = package->module(); 1224 if (module->location() != NULL) { 1225 ResourceMark rm(THREAD); 1226 Handle ml = java_lang_String::create_from_str( 1227 module->location()->as_C_string(), THREAD); 1228 return ml(); 1229 } 1230 // Return entry on boot loader class path. 1231 Handle cph = java_lang_String::create_from_str( 1232 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD); 1233 return cph(); 1234 } 1235 } 1236 return NULL; 1237 } 1238 1239 objArrayOop ClassLoader::get_system_packages(TRAPS) { 1240 ResourceMark rm(THREAD); 1241 // List of pointers to PackageEntrys that have loaded classes. 1242 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50); 1243 { 1244 MutexLocker ml(Module_lock, THREAD); 1245 1246 PackageEntryTable* pe_table = 1247 ClassLoaderData::the_null_class_loader_data()->packages(); 1248 1249 // Collect the packages that have at least one loaded class. 1250 for (int x = 0; x < pe_table->table_size(); x++) { 1251 for (PackageEntry* package_entry = pe_table->bucket(x); 1252 package_entry != NULL; 1253 package_entry = package_entry->next()) { 1254 if (package_entry->has_loaded_class()) { 1255 loaded_class_pkgs->append(package_entry); 1256 } 1257 } 1258 } 1259 } 1260 1261 1262 // Allocate objArray and fill with java.lang.String 1263 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), 1264 loaded_class_pkgs->length(), CHECK_NULL); 1265 objArrayHandle result(THREAD, r); 1266 for (int x = 0; x < loaded_class_pkgs->length(); x++) { 1267 PackageEntry* package_entry = loaded_class_pkgs->at(x); 1268 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL); 1269 result->obj_at_put(x, str()); 1270 } 1271 return result(); 1272 } 1273 1274 #if INCLUDE_CDS 1275 s2 ClassLoader::module_to_classloader(const char* module_name) { 1276 1277 assert(DumpSharedSpaces, "dump time only"); 1278 assert(_boot_modules_array != NULL, "_boot_modules_array is NULL"); 1279 assert(_platform_modules_array != NULL, "_platform_modules_array is NULL"); 1280 1281 int array_size = _boot_modules_array->length(); 1282 for (int i = 0; i < array_size; i++) { 1283 if (strcmp(module_name, _boot_modules_array->at(i)) == 0) { 1284 return BOOT_LOADER; 1285 } 1286 } 1287 1288 array_size = _platform_modules_array->length(); 1289 for (int i = 0; i < array_size; i++) { 1290 if (strcmp(module_name, _platform_modules_array->at(i)) == 0) { 1291 return PLATFORM_LOADER; 1292 } 1293 } 1294 1295 return APP_LOADER; 1296 } 1297 1298 s2 ClassLoader::classloader_type(Symbol* class_name, ClassPathEntry* e, int classpath_index, TRAPS) { 1299 assert(DumpSharedSpaces, "Only used for CDS dump time"); 1300 1301 // obtain the classloader type based on the class name. 1302 // First obtain the package name based on the class name. Then obtain 1303 // the classloader type based on the package name from the jimage using 1304 // a jimage API. If the classloader type cannot be found from the 1305 // jimage, it is determined by the class path entry. 1306 jshort loader_type = ClassLoader::APP_LOADER; 1307 if (e->is_jrt()) { 1308 ResourceMark rm; 1309 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK_0); 1310 if (pkg_name != NULL) { 1311 const char* pkg_name_C_string = (const char*)(pkg_name->as_C_string()); 1312 ClassPathImageEntry* cpie = (ClassPathImageEntry*)e; 1313 JImageFile* jimage = cpie->jimage(); 1314 char* module_name = (char*)(*JImagePackageToModule)(jimage, pkg_name_C_string); 1315 if (module_name != NULL) { 1316 loader_type = ClassLoader::module_to_classloader(module_name); 1317 } 1318 } 1319 } else if (ClassLoaderExt::is_boot_classpath(classpath_index)) { 1320 loader_type = ClassLoader::BOOT_LOADER; 1321 } 1322 return loader_type; 1323 } 1324 #endif 1325 1326 // caller needs ResourceMark 1327 const char* ClassLoader::file_name_for_class_name(const char* class_name, 1328 int class_name_len) { 1329 assert(class_name != NULL, "invariant"); 1330 assert((int)strlen(class_name) == class_name_len, "invariant"); 1331 1332 static const char class_suffix[] = ".class"; 1333 1334 char* const file_name = NEW_RESOURCE_ARRAY(char, 1335 class_name_len + 1336 sizeof(class_suffix)); // includes term NULL 1337 1338 strncpy(file_name, class_name, class_name_len); 1339 strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix)); 1340 1341 return file_name; 1342 } 1343 1344 // Search either the patch-module or exploded build entries for class 1345 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list, 1346 const char* const class_name, const char* const file_name, TRAPS) { 1347 ClassFileStream* stream = NULL; 1348 1349 // Find the class' defining module in the boot loader's module entry table 1350 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL); 1351 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL; 1352 1353 // If the module system has not defined java.base yet, then 1354 // classes loaded are assumed to be defined to java.base. 1355 // When java.base is eventually defined by the module system, 1356 // all packages of classes that have been previously loaded 1357 // are verified in ModuleEntryTable::verify_javabase_packages(). 1358 if (!Universe::is_module_initialized() && 1359 !ModuleEntryTable::javabase_defined() && 1360 mod_entry == NULL) { 1361 mod_entry = ModuleEntryTable::javabase_moduleEntry(); 1362 } 1363 1364 // The module must be a named module 1365 if (mod_entry != NULL && mod_entry->is_named()) { 1366 int num_of_entries = module_list->length(); 1367 const Symbol* class_module_name = mod_entry->name(); 1368 1369 // Loop through all the modules in either the patch-module or exploded entries looking for module 1370 for (int i = 0; i < num_of_entries; i++) { 1371 ModuleClassPathList* module_cpl = module_list->at(i); 1372 Symbol* module_cpl_name = module_cpl->module_name(); 1373 1374 if (module_cpl_name->fast_compare(class_module_name) == 0) { 1375 // Class' module has been located, attempt to load 1376 // the class from the module's ClassPathEntry list. 1377 ClassPathEntry* e = module_cpl->module_first_entry(); 1378 while (e != NULL) { 1379 stream = e->open_stream(file_name, CHECK_NULL); 1380 // No context.check is required since CDS is not supported 1381 // for an exploded modules build or if --patch-module is specified. 1382 if (NULL != stream) { 1383 return stream; 1384 } 1385 e = e->next(); 1386 } 1387 // If the module was located, break out even if the class was not 1388 // located successfully from that module's ClassPathEntry list. 1389 // There will not be another valid entry for that module. 1390 return NULL; 1391 } 1392 } 1393 } 1394 1395 return NULL; 1396 } 1397 1398 instanceKlassHandle ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) { 1399 assert(name != NULL, "invariant"); 1400 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 1401 1402 ResourceMark rm(THREAD); 1403 HandleMark hm(THREAD); 1404 1405 const char* const class_name = name->as_C_string(); 1406 1407 EventMark m("loading class %s", class_name); 1408 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion); 1409 1410 const char* const file_name = file_name_for_class_name(class_name, 1411 name->utf8_length()); 1412 assert(file_name != NULL, "invariant"); 1413 1414 ClassLoaderExt::Context context(class_name, file_name, THREAD); 1415 1416 // Lookup stream for parsing .class file 1417 ClassFileStream* stream = NULL; 1418 s2 classpath_index = 0; 1419 ClassPathEntry* e = NULL; 1420 1421 // If DumpSharedSpaces is true boot loader visibility boundaries are set to: 1422 // - [jimage] + [_first_append_entry to _last_append_entry] (all path entries). 1423 // No --patch-module entries or exploded module builds are included since CDS 1424 // is not supported if --patch-module or exploded module builds are used. 1425 // 1426 // If search_append_only is true, boot loader visibility boundaries are 1427 // set to be _first_append_entry to the end. This includes: 1428 // [-Xbootclasspath/a]; [jvmti appended entries] 1429 // 1430 // If both DumpSharedSpaces and search_append_only are false, boot loader 1431 // visibility boundaries are set to be the --patch-module entries plus the base piece. 1432 // This would include: 1433 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build] 1434 // 1435 // DumpSharedSpaces and search_append_only are mutually exclusive and cannot 1436 // be true at the same time. 1437 assert(!(DumpSharedSpaces && search_append_only), "DumpSharedSpaces and search_append_only are both true"); 1438 1439 // Load Attempt #1: --patch-module 1440 // Determine the class' defining module. If it appears in the _patch_mod_entries, 1441 // attempt to load the class from those locations specific to the module. 1442 // Specifications to --patch-module can contain a partial number of classes 1443 // that are part of the overall module definition. So if a particular class is not 1444 // found within its module specification, the search should continue to Load Attempt #2. 1445 // Note: The --patch-module entries are never searched if the boot loader's 1446 // visibility boundary is limited to only searching the append entries. 1447 if (_patch_mod_entries != NULL && !search_append_only && !DumpSharedSpaces) { 1448 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL); 1449 } 1450 1451 // Load Attempt #2: [jimage | exploded build] 1452 if (!search_append_only && (NULL == stream)) { 1453 if (has_jrt_entry()) { 1454 e = _jrt_entry; 1455 stream = _jrt_entry->open_stream(file_name, CHECK_NULL); 1456 if (!context.check(stream, classpath_index)) { 1457 return NULL; 1458 } 1459 } else { 1460 // Exploded build - attempt to locate class in its defining module's location. 1461 assert(_exploded_entries != NULL, "No exploded build entries present"); 1462 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL); 1463 } 1464 } 1465 1466 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries] 1467 if ((search_append_only || DumpSharedSpaces) && (NULL == stream)) { 1468 // For the boot loader append path search, the starting classpath_index 1469 // for the appended piece is always 1 to account for either the 1470 // _jrt_entry or the _exploded_entries. 1471 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly"); 1472 classpath_index = 1; 1473 1474 e = _first_append_entry; 1475 while (e != NULL) { 1476 stream = e->open_stream(file_name, CHECK_NULL); 1477 if (!context.check(stream, classpath_index)) { 1478 return NULL; 1479 } 1480 if (NULL != stream) { 1481 break; 1482 } 1483 e = e->next(); 1484 ++classpath_index; 1485 } 1486 } 1487 1488 if (NULL == stream) { 1489 if (DumpSharedSpaces) { 1490 tty->print_cr("Preload Warning: Cannot find %s", class_name); 1491 } 1492 return NULL; 1493 } 1494 1495 stream->set_verify(context.should_verify(classpath_index)); 1496 1497 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 1498 Handle protection_domain; 1499 1500 instanceKlassHandle result = KlassFactory::create_from_stream(stream, 1501 name, 1502 loader_data, 1503 protection_domain, 1504 NULL, // host_klass 1505 NULL, // cp_patches 1506 THREAD); 1507 if (HAS_PENDING_EXCEPTION) { 1508 if (DumpSharedSpaces) { 1509 tty->print_cr("Preload Error: Failed to load %s", class_name); 1510 } 1511 return NULL; 1512 } 1513 1514 return context.record_result(name, e, classpath_index, result, THREAD); 1515 } 1516 1517 // Initialize the class loader's access to methods in libzip. Parse and 1518 // process the boot classpath into a list ClassPathEntry objects. Once 1519 // this list has been created, it must not change order (see class PackageInfo) 1520 // it can be appended to and is by jvmti and the kernel vm. 1521 1522 void ClassLoader::initialize() { 1523 EXCEPTION_MARK; 1524 1525 if (UsePerfData) { 1526 // jvmstat performance counters 1527 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time"); 1528 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime"); 1529 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self"); 1530 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime"); 1531 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self"); 1532 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime"); 1533 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self"); 1534 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses"); 1535 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses"); 1536 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses"); 1537 1538 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime"); 1539 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self"); 1540 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime"); 1541 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime"); 1542 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime"); 1543 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime"); 1544 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self"); 1545 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount"); 1546 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses"); 1547 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime"); 1548 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self"); 1549 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes"); 1550 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes"); 1551 1552 1553 // The following performance counters are added for measuring the impact 1554 // of the bug fix of 6365597. They are mainly focused on finding out 1555 // the behavior of system & user-defined classloader lock, whether 1556 // ClassLoader.loadClass/findClass is being called synchronized or not. 1557 // Also two additional counters are created to see whether 'UnsyncloadClass' 1558 // flag is being set or not and how many times load_instance_class call 1559 // fails with linkageError etc. 1560 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS, 1561 "systemLoaderLockContentionRate"); 1562 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS, 1563 "nonSystemLoaderLockContentionRate"); 1564 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS, 1565 "jvmFindLoadedClassNoLockCalls"); 1566 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS, 1567 "jvmDefineClassNoLockCalls"); 1568 1569 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS, 1570 "jniDefineClassNoLockCalls"); 1571 1572 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, 1573 "unsafeDefineClassCalls"); 1574 1575 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet"); 1576 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS, 1577 "loadInstanceClassFailRate"); 1578 1579 // increment the isUnsyncloadClass counter if UnsyncloadClass is set. 1580 if (UnsyncloadClass) { 1581 _isUnsyncloadClass->inc(); 1582 } 1583 } 1584 1585 // lookup zip library entry points 1586 load_zip_library(); 1587 // lookup jimage library entry points 1588 load_jimage_library(); 1589 #if INCLUDE_CDS 1590 // initialize search path 1591 if (DumpSharedSpaces) { 1592 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info(); 1593 } 1594 #endif 1595 setup_bootstrap_search_path(); 1596 } 1597 1598 #if INCLUDE_CDS 1599 void ClassLoader::initialize_shared_path() { 1600 if (DumpSharedSpaces) { 1601 ClassLoaderExt::setup_search_paths(); 1602 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check() 1603 } 1604 } 1605 #endif 1606 1607 jlong ClassLoader::classloader_time_ms() { 1608 return UsePerfData ? 1609 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1; 1610 } 1611 1612 jlong ClassLoader::class_init_count() { 1613 return UsePerfData ? _perf_classes_inited->get_value() : -1; 1614 } 1615 1616 jlong ClassLoader::class_init_time_ms() { 1617 return UsePerfData ? 1618 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1; 1619 } 1620 1621 jlong ClassLoader::class_verify_time_ms() { 1622 return UsePerfData ? 1623 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1; 1624 } 1625 1626 jlong ClassLoader::class_link_count() { 1627 return UsePerfData ? _perf_classes_linked->get_value() : -1; 1628 } 1629 1630 jlong ClassLoader::class_link_time_ms() { 1631 return UsePerfData ? 1632 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1; 1633 } 1634 1635 int ClassLoader::compute_Object_vtable() { 1636 // hardwired for JDK1.2 -- would need to duplicate class file parsing 1637 // code to determine actual value from file 1638 // Would be value '11' if finals were in vtable 1639 int JDK_1_2_Object_vtable_size = 5; 1640 return JDK_1_2_Object_vtable_size * vtableEntry::size(); 1641 } 1642 1643 1644 void classLoader_init1() { 1645 ClassLoader::initialize(); 1646 } 1647 1648 // Complete the ClassPathEntry setup for the boot loader 1649 void ClassLoader::classLoader_init2(TRAPS) { 1650 // Create the moduleEntry for java.base 1651 create_javabase(); 1652 1653 // Setup the list of module/path pairs for --patch-module processing 1654 // This must be done after the SymbolTable is created in order 1655 // to use fast_compare on module names instead of a string compare. 1656 if (Arguments::get_patch_mod_prefix() != NULL) { 1657 setup_patch_mod_entries(); 1658 } 1659 1660 // Setup the initial java.base/path pair for the exploded build entries. 1661 // As more modules are defined during module system initialization, more 1662 // entries will be added to the exploded build array. 1663 if (!has_jrt_entry()) { 1664 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds"); 1665 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds"); 1666 add_to_exploded_build_list(vmSymbols::java_base(), CHECK); 1667 } 1668 } 1669 1670 1671 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) { 1672 assert(orig != NULL && out != NULL && len > 0, "bad arguments"); 1673 if (CanonicalizeEntry != NULL) { 1674 JavaThread* THREAD = JavaThread::current(); 1675 JNIEnv* env = THREAD->jni_environment(); 1676 ResourceMark rm(THREAD); 1677 1678 // os::native_path writes into orig_copy 1679 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1); 1680 strcpy(orig_copy, orig); 1681 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) { 1682 return false; 1683 } 1684 } else { 1685 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing 1686 strncpy(out, orig, len); 1687 out[len - 1] = '\0'; 1688 } 1689 return true; 1690 } 1691 1692 void ClassLoader::create_javabase() { 1693 Thread* THREAD = Thread::current(); 1694 1695 // Create java.base's module entry for the boot 1696 // class loader prior to loading j.l.Ojbect. 1697 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 1698 1699 // Get module entry table 1700 ModuleEntryTable* null_cld_modules = null_cld->modules(); 1701 if (null_cld_modules == NULL) { 1702 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader"); 1703 } 1704 1705 { 1706 MutexLocker ml(Module_lock, THREAD); 1707 ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(NULL), vmSymbols::java_base(), NULL, NULL, null_cld); 1708 if (jb_module == NULL) { 1709 vm_exit_during_initialization("Unable to create ModuleEntry for java.base"); 1710 } 1711 ModuleEntryTable::set_javabase_moduleEntry(jb_module); 1712 } 1713 } 1714 1715 #ifndef PRODUCT 1716 1717 // CompileTheWorld 1718 // 1719 // Iterates over all class path entries and forces compilation of all methods 1720 // in all classes found. Currently, only zip/jar archives are searched. 1721 // 1722 // The classes are loaded by the Java level bootstrap class loader, and the 1723 // initializer is called. If DelayCompilationDuringStartup is true (default), 1724 // the interpreter will run the initialization code. Note that forcing 1725 // initialization in this way could potentially lead to initialization order 1726 // problems, in which case we could just force the initialization bit to be set. 1727 1728 1729 // We need to iterate over the contents of a zip/jar file, so we replicate the 1730 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile, 1731 // since jzfile already has a void* definition. 1732 // 1733 // Note that this is only used in debug mode. 1734 // 1735 // HotSpot integration note: 1736 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build 1737 1738 1739 // JDK 1.3 version 1740 typedef struct real_jzentry { /* Zip file entry */ 1741 char *name; /* entry name */ 1742 jint time; /* modification time */ 1743 jint size; /* size of uncompressed data */ 1744 jint csize; /* size of compressed data (zero if uncompressed) */ 1745 jint crc; /* crc of uncompressed data */ 1746 char *comment; /* optional zip file comment */ 1747 jbyte *extra; /* optional extra data */ 1748 jint pos; /* position of LOC header (if negative) or data */ 1749 } real_jzentry; 1750 1751 typedef struct real_jzfile { /* Zip file */ 1752 char *name; /* zip file name */ 1753 jint refs; /* number of active references */ 1754 jint fd; /* open file descriptor */ 1755 void *lock; /* read lock */ 1756 char *comment; /* zip file comment */ 1757 char *msg; /* zip error message */ 1758 void *entries; /* array of hash cells */ 1759 jint total; /* total number of entries */ 1760 unsigned short *table; /* Hash chain heads: indexes into entries */ 1761 jint tablelen; /* number of hash eads */ 1762 real_jzfile *next; /* next zip file in search list */ 1763 jzentry *cache; /* we cache the most recently freed jzentry */ 1764 /* Information on metadata names in META-INF directory */ 1765 char **metanames; /* array of meta names (may have null names) */ 1766 jint metacount; /* number of slots in metanames array */ 1767 /* If there are any per-entry comments, they are in the comments array */ 1768 char **comments; 1769 } real_jzfile; 1770 1771 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) { 1772 // For now we only compile all methods in all classes in zip/jar files 1773 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir); 1774 tty->cr(); 1775 } 1776 1777 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) { 1778 real_jzfile* zip = (real_jzfile*) _zip; 1779 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name); 1780 tty->cr(); 1781 // Iterate over all entries in zip file 1782 for (int n = 0; ; n++) { 1783 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n)); 1784 if (ze == NULL) break; 1785 ClassLoader::compile_the_world_in(ze->name, loader, CHECK); 1786 } 1787 if (HAS_PENDING_EXCEPTION) { 1788 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1789 CLEAR_PENDING_EXCEPTION; 1790 tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); 1791 tty->print_cr("Increase class metadata storage if a limit was set"); 1792 } else { 1793 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); 1794 } 1795 } 1796 } 1797 1798 void ClassLoader::compile_the_world() { 1799 EXCEPTION_MARK; 1800 HandleMark hm(THREAD); 1801 ResourceMark rm(THREAD); 1802 1803 assert(has_jrt_entry(), "Compile The World not supported with exploded module build"); 1804 1805 // Find bootstrap loader 1806 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader()); 1807 jlong start = os::javaTimeMillis(); 1808 1809 // Compile the world for the modular java runtime image 1810 _jrt_entry->compile_the_world(system_class_loader, CATCH); 1811 1812 // Iterate over all bootstrap class path appended entries 1813 ClassPathEntry* e = _first_append_entry; 1814 while (e != NULL) { 1815 assert(!e->is_jrt(), "A modular java runtime image is present on the list of appended entries"); 1816 e->compile_the_world(system_class_loader, CATCH); 1817 e = e->next(); 1818 } 1819 jlong end = os::javaTimeMillis(); 1820 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)", 1821 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start)); 1822 { 1823 // Print statistics as if before normal exit: 1824 extern void print_statistics(); 1825 print_statistics(); 1826 } 1827 vm_exit(0); 1828 } 1829 1830 int ClassLoader::_compile_the_world_class_counter = 0; 1831 int ClassLoader::_compile_the_world_method_counter = 0; 1832 static int _codecache_sweep_counter = 0; 1833 1834 // Filter out all exceptions except OOMs 1835 static void clear_pending_exception_if_not_oom(TRAPS) { 1836 if (HAS_PENDING_EXCEPTION && 1837 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1838 CLEAR_PENDING_EXCEPTION; 1839 } 1840 // The CHECK at the caller will propagate the exception out 1841 } 1842 1843 /** 1844 * Returns if the given method should be compiled when doing compile-the-world. 1845 * 1846 * TODO: This should be a private method in a CompileTheWorld class. 1847 */ 1848 static bool can_be_compiled(methodHandle m, int comp_level) { 1849 assert(CompileTheWorld, "must be"); 1850 1851 // It's not valid to compile a native wrapper for MethodHandle methods 1852 // that take a MemberName appendix since the bytecode signature is not 1853 // correct. 1854 vmIntrinsics::ID iid = m->intrinsic_id(); 1855 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) { 1856 return false; 1857 } 1858 1859 return CompilationPolicy::can_be_compiled(m, comp_level); 1860 } 1861 1862 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) { 1863 if (string_ends_with(name, ".class")) { 1864 // We have a .class file 1865 int len = (int)strlen(name); 1866 char buffer[2048]; 1867 strncpy(buffer, name, len - 6); 1868 buffer[len-6] = 0; 1869 // If the file has a period after removing .class, it's not really a 1870 // valid class file. The class loader will check everything else. 1871 if (strchr(buffer, '.') == NULL) { 1872 _compile_the_world_class_counter++; 1873 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return; 1874 1875 // Construct name without extension 1876 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK); 1877 // Use loader to load and initialize class 1878 Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD); 1879 instanceKlassHandle k (THREAD, ik); 1880 if (k.not_null() && !HAS_PENDING_EXCEPTION) { 1881 k->initialize(THREAD); 1882 } 1883 bool exception_occurred = HAS_PENDING_EXCEPTION; 1884 clear_pending_exception_if_not_oom(CHECK); 1885 if (CompileTheWorldPreloadClasses && k.not_null()) { 1886 ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD); 1887 if (HAS_PENDING_EXCEPTION) { 1888 // If something went wrong in preloading we just ignore it 1889 clear_pending_exception_if_not_oom(CHECK); 1890 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer); 1891 } 1892 } 1893 1894 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) { 1895 if (k.is_null() || exception_occurred) { 1896 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class 1897 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer); 1898 } else { 1899 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer); 1900 // Preload all classes to get around uncommon traps 1901 // Iterate over all methods in class 1902 int comp_level = CompilationPolicy::policy()->initial_compile_level(); 1903 for (int n = 0; n < k->methods()->length(); n++) { 1904 methodHandle m (THREAD, k->methods()->at(n)); 1905 if (can_be_compiled(m, comp_level)) { 1906 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) { 1907 // Give sweeper a chance to keep up with CTW 1908 VM_ForceSafepoint op; 1909 VMThread::execute(&op); 1910 _codecache_sweep_counter = 0; 1911 } 1912 // Force compilation 1913 CompileBroker::compile_method(m, InvocationEntryBci, comp_level, 1914 methodHandle(), 0, CompileTask::Reason_CTW, THREAD); 1915 if (HAS_PENDING_EXCEPTION) { 1916 clear_pending_exception_if_not_oom(CHECK); 1917 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1918 } else { 1919 _compile_the_world_method_counter++; 1920 } 1921 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) { 1922 // Clobber the first compile and force second tier compilation 1923 CompiledMethod* nm = m->code(); 1924 if (nm != NULL && !m->is_method_handle_intrinsic()) { 1925 // Throw out the code so that the code cache doesn't fill up 1926 nm->make_not_entrant(); 1927 m->clear_code(); 1928 } 1929 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization, 1930 methodHandle(), 0, CompileTask::Reason_CTW, THREAD); 1931 if (HAS_PENDING_EXCEPTION) { 1932 clear_pending_exception_if_not_oom(CHECK); 1933 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1934 } else { 1935 _compile_the_world_method_counter++; 1936 } 1937 } 1938 } else { 1939 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1940 } 1941 1942 CompiledMethod* nm = m->code(); 1943 if (nm != NULL && !m->is_method_handle_intrinsic()) { 1944 // Throw out the code so that the code cache doesn't fill up 1945 nm->make_not_entrant(); 1946 m->clear_code(); 1947 } 1948 } 1949 } 1950 } 1951 } 1952 } 1953 } 1954 1955 #endif //PRODUCT 1956 1957 // Please keep following two functions at end of this file. With them placed at top or in middle of the file, 1958 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589. 1959 void PerfClassTraceTime::initialize() { 1960 if (!UsePerfData) return; 1961 1962 if (_eventp != NULL) { 1963 // increment the event counter 1964 _eventp->inc(); 1965 } 1966 1967 // stop the current active thread-local timer to measure inclusive time 1968 _prev_active_event = -1; 1969 for (int i=0; i < EVENT_TYPE_COUNT; i++) { 1970 if (_timers[i].is_active()) { 1971 assert(_prev_active_event == -1, "should have only one active timer"); 1972 _prev_active_event = i; 1973 _timers[i].stop(); 1974 } 1975 } 1976 1977 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) { 1978 // start the inclusive timer if not recursively called 1979 _t.start(); 1980 } 1981 1982 // start thread-local timer of the given event type 1983 if (!_timers[_event_type].is_active()) { 1984 _timers[_event_type].start(); 1985 } 1986 } 1987 1988 PerfClassTraceTime::~PerfClassTraceTime() { 1989 if (!UsePerfData) return; 1990 1991 // stop the thread-local timer as the event completes 1992 // and resume the thread-local timer of the event next on the stack 1993 _timers[_event_type].stop(); 1994 jlong selftime = _timers[_event_type].ticks(); 1995 1996 if (_prev_active_event >= 0) { 1997 _timers[_prev_active_event].start(); 1998 } 1999 2000 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return; 2001 2002 // increment the counters only on the leaf call 2003 _t.stop(); 2004 _timep->inc(_t.ticks()); 2005 if (_selftimep != NULL) { 2006 _selftimep->inc(selftime); 2007 } 2008 // add all class loading related event selftime to the accumulated time counter 2009 ClassLoader::perf_accumulated_time()->inc(selftime); 2010 2011 // reset the timer 2012 _timers[_event_type].reset(); 2013 }