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 typedef void (JNICALL *FreeEntry_t)(jzfile *zip, jzentry *entry); 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 GetNextEntry_t GetNextEntry = NULL; 94 static canonicalize_fn_t CanonicalizeEntry = NULL; 95 static ZipInflateFully_t ZipInflateFully = NULL; 96 static Crc32_t Crc32 = NULL; 97 static FreeEntry_t FreeEntry = 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 int ClassLoader::_num_patch_mod_prefixes = 0; 154 #endif 155 156 // helper routines 157 bool string_starts_with(const char* str, const char* str_to_find) { 158 size_t str_len = strlen(str); 159 size_t str_to_find_len = strlen(str_to_find); 160 if (str_to_find_len > str_len) { 161 return false; 162 } 163 return (strncmp(str, str_to_find, str_to_find_len) == 0); 164 } 165 166 static const char* get_jimage_version_string() { 167 static char version_string[10] = ""; 168 if (version_string[0] == '\0') { 169 jio_snprintf(version_string, sizeof(version_string), "%d.%d", 170 Abstract_VM_Version::vm_major_version(), Abstract_VM_Version::vm_minor_version()); 171 } 172 return (const char*)version_string; 173 } 174 175 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) { 176 size_t str_len = strlen(str); 177 size_t str_to_find_len = strlen(str_to_find); 178 if (str_to_find_len > str_len) { 179 return false; 180 } 181 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0); 182 } 183 184 // Used to obtain the package name from a fully qualified class name. 185 // It is the responsibility of the caller to establish a ResourceMark. 186 const char* ClassLoader::package_from_name(const char* const class_name, bool* bad_class_name) { 187 if (class_name == NULL) { 188 if (bad_class_name != NULL) { 189 *bad_class_name = true; 190 } 191 return NULL; 192 } 193 194 if (bad_class_name != NULL) { 195 *bad_class_name = false; 196 } 197 198 const char* const last_slash = strrchr(class_name, '/'); 199 if (last_slash == NULL) { 200 // No package name 201 return NULL; 202 } 203 204 char* class_name_ptr = (char*) class_name; 205 // Skip over '['s 206 if (*class_name_ptr == '[') { 207 do { 208 class_name_ptr++; 209 } while (*class_name_ptr == '['); 210 211 // Fully qualified class names should not contain a 'L'. 212 // Set bad_class_name to true to indicate that the package name 213 // could not be obtained due to an error condition. 214 // In this situation, is_same_class_package returns false. 215 if (*class_name_ptr == 'L') { 216 if (bad_class_name != NULL) { 217 *bad_class_name = true; 218 } 219 return NULL; 220 } 221 } 222 223 int length = last_slash - class_name_ptr; 224 225 // A class name could have just the slash character in the name. 226 if (length <= 0) { 227 // No package name 228 if (bad_class_name != NULL) { 229 *bad_class_name = true; 230 } 231 return NULL; 232 } 233 234 // drop name after last slash (including slash) 235 // Ex., "java/lang/String.class" => "java/lang" 236 char* pkg_name = NEW_RESOURCE_ARRAY(char, length + 1); 237 strncpy(pkg_name, class_name_ptr, length); 238 *(pkg_name+length) = '\0'; 239 240 return (const char *)pkg_name; 241 } 242 243 // Given a fully qualified class name, find its defining package in the class loader's 244 // package entry table. 245 static PackageEntry* get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS) { 246 ResourceMark rm(THREAD); 247 const char *pkg_name = ClassLoader::package_from_name(class_name); 248 if (pkg_name == NULL) { 249 return NULL; 250 } 251 PackageEntryTable* pkgEntryTable = loader_data->packages(); 252 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(pkg_name, CHECK_NULL); 253 return pkgEntryTable->lookup_only(pkg_symbol); 254 } 255 256 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() { 257 char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass); 258 strcpy(copy, dir); 259 _dir = copy; 260 } 261 262 263 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) { 264 // construct full path name 265 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN); 266 if (jio_snprintf(path, JVM_MAXPATHLEN, "%s%s%s", _dir, os::file_separator(), name) == -1) { 267 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN); 268 return NULL; 269 } 270 // check if file exists 271 struct stat st; 272 if (os::stat(path, &st) == 0) { 273 #if INCLUDE_CDS 274 if (DumpSharedSpaces) { 275 // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so 276 // we should never find a file underneath it -- unless user has added a new file while we are running 277 // the dump, in which case let's quit! 278 ShouldNotReachHere(); 279 } 280 #endif 281 // found file, open it 282 int file_handle = os::open(path, 0, 0); 283 if (file_handle != -1) { 284 // read contents into resource array 285 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size); 286 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size); 287 // close file 288 os::close(file_handle); 289 // construct ClassFileStream 290 if (num_read == (size_t)st.st_size) { 291 if (UsePerfData) { 292 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read); 293 } 294 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN); 295 // Resource allocated 296 return new ClassFileStream(buffer, 297 st.st_size, 298 _dir, 299 ClassFileStream::verify); 300 } 301 } 302 } 303 FREE_RESOURCE_ARRAY(char, path, JVM_MAXPATHLEN); 304 return NULL; 305 } 306 307 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() { 308 _zip = zip; 309 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass); 310 strcpy(copy, zip_name); 311 _zip_name = copy; 312 _is_boot_append = is_boot_append; 313 _multi_versioned = _unknown; 314 } 315 316 ClassPathZipEntry::~ClassPathZipEntry() { 317 if (ZipClose != NULL) { 318 (*ZipClose)(_zip); 319 } 320 FREE_C_HEAP_ARRAY(char, _zip_name); 321 } 322 323 bool ClassPathZipEntry::stream_exists(const char* name) { 324 // enable call to C land 325 JavaThread* thread = JavaThread::current(); 326 ThreadToNativeFromVM ttn(thread); 327 // check whether zip archive contains name 328 jint name_len, filesize; 329 jzentry* entry = (*FindEntry)(_zip, name, &filesize, &name_len); 330 if (entry != NULL) { 331 (*FreeEntry)(_zip, entry); 332 return true; 333 } 334 return false; 335 } 336 337 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) { 338 // enable call to C land 339 JavaThread* thread = JavaThread::current(); 340 ThreadToNativeFromVM ttn(thread); 341 // check whether zip archive contains name 342 jint name_len; 343 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len); 344 if (entry == NULL) return NULL; 345 u1* buffer; 346 char name_buf[128]; 347 char* filename; 348 if (name_len < 128) { 349 filename = name_buf; 350 } else { 351 filename = NEW_RESOURCE_ARRAY(char, name_len + 1); 352 } 353 354 // read contents into resource array 355 int size = (*filesize) + ((nul_terminate) ? 1 : 0); 356 buffer = NEW_RESOURCE_ARRAY(u1, size); 357 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL; 358 359 // return result 360 if (nul_terminate) { 361 buffer[*filesize] = 0; 362 } 363 return buffer; 364 } 365 366 #if INCLUDE_CDS 367 u1* ClassPathZipEntry::open_versioned_entry(const char* name, jint* filesize, TRAPS) { 368 u1* buffer = NULL; 369 if (DumpSharedSpaces && !_is_boot_append) { 370 // We presume default is multi-release enabled 371 const char* multi_ver = Arguments::get_property("jdk.util.jar.enableMultiRelease"); 372 const char* verstr = Arguments::get_property("jdk.util.jar.version"); 373 bool is_multi_ver = (multi_ver == NULL || 374 strcmp(multi_ver, "true") == 0 || 375 strcmp(multi_ver, "force") == 0) && 376 is_multiple_versioned(THREAD); 377 // command line version setting 378 int version = 0; 379 const int base_version = 8; // JDK8 380 int cur_ver = JDK_Version::current().major_version(); 381 if (verstr != NULL) { 382 version = atoi(verstr); 383 if (version < base_version || version > cur_ver) { 384 is_multi_ver = false; 385 // print out warning, do not use assertion here since it will continue to look 386 // for proper version. 387 warning("JDK%d is not supported in multiple version jars", version); 388 } 389 } 390 391 if (is_multi_ver) { 392 int n; 393 char* entry_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN); 394 if (version > 0) { 395 n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", version, name); 396 entry_name[n] = '\0'; 397 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL); 398 if (buffer == NULL) { 399 warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name); 400 } 401 } 402 if (buffer == NULL) { 403 for (int i = cur_ver; i >= base_version; i--) { 404 n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", i, name); 405 entry_name[n] = '\0'; 406 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL); 407 if (buffer != NULL) { 408 break; 409 } 410 } 411 } 412 FREE_RESOURCE_ARRAY(char, entry_name, JVM_MAXPATHLEN); 413 } 414 } 415 return buffer; 416 } 417 418 bool ClassPathZipEntry::is_multiple_versioned(TRAPS) { 419 assert(DumpSharedSpaces, "called only at dump time"); 420 if (_multi_versioned != _unknown) { 421 return (_multi_versioned == _yes) ? true : false; 422 } 423 jint size; 424 char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, true, CHECK_false); 425 if (buffer != NULL) { 426 char* p = buffer; 427 for ( ; *p; ++p) *p = tolower(*p); 428 if (strstr(buffer, "multi-release: true") != NULL) { 429 _multi_versioned = _yes; 430 return true; 431 } 432 } 433 _multi_versioned = _no; 434 return false; 435 } 436 #endif // INCLUDE_CDS 437 438 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) { 439 jint filesize; 440 u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL); 441 if (buffer == NULL) { 442 buffer = open_entry(name, &filesize, false, CHECK_NULL); 443 if (buffer == NULL) { 444 return NULL; 445 } 446 } 447 if (UsePerfData) { 448 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize); 449 } 450 // Resource allocated 451 return new ClassFileStream(buffer, 452 filesize, 453 _zip_name, 454 ClassFileStream::verify); 455 } 456 457 // invoke function for each entry in the zip file 458 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) { 459 JavaThread* thread = JavaThread::current(); 460 HandleMark handle_mark(thread); 461 ThreadToNativeFromVM ttn(thread); 462 for (int n = 0; ; n++) { 463 jzentry * ze = ((*GetNextEntry)(_zip, n)); 464 if (ze == NULL) break; 465 (*f)(ze->name, context); 466 } 467 } 468 469 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) : 470 ClassPathEntry(), 471 _jimage(jimage) { 472 guarantee(jimage != NULL, "jimage file is null"); 473 guarantee(name != NULL, "jimage file name is null"); 474 size_t len = strlen(name) + 1; 475 _name = NEW_C_HEAP_ARRAY(const char, len, mtClass); 476 strncpy((char *)_name, name, len); 477 } 478 479 ClassPathImageEntry::~ClassPathImageEntry() { 480 if (_name != NULL) { 481 FREE_C_HEAP_ARRAY(const char, _name); 482 _name = NULL; 483 } 484 if (_jimage != NULL) { 485 (*JImageClose)(_jimage); 486 _jimage = NULL; 487 } 488 } 489 490 // For a class in a named module, look it up in the jimage file using this syntax: 491 // /<module-name>/<package-name>/<base-class> 492 // 493 // Assumptions: 494 // 1. There are no unnamed modules in the jimage file. 495 // 2. A package is in at most one module in the jimage file. 496 // 497 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) { 498 jlong size; 499 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size); 500 501 if (location == 0) { 502 ResourceMark rm; 503 const char* pkg_name = ClassLoader::package_from_name(name); 504 505 if (pkg_name != NULL) { 506 if (!Universe::is_module_initialized()) { 507 location = (*JImageFindResource)(_jimage, "java.base", get_jimage_version_string(), name, &size); 508 #if INCLUDE_CDS 509 // CDS uses the boot class loader to load classes whose packages are in 510 // modules defined for other class loaders. So, for now, get their module 511 // names from the "modules" jimage file. 512 if (DumpSharedSpaces && location == 0) { 513 const char* module_name = (*JImagePackageToModule)(_jimage, pkg_name); 514 if (module_name != NULL) { 515 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size); 516 } 517 } 518 #endif 519 520 } else { 521 PackageEntry* package_entry = get_package_entry(name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL); 522 if (package_entry != NULL) { 523 ResourceMark rm; 524 // Get the module name 525 ModuleEntry* module = package_entry->module(); 526 assert(module != NULL, "Boot classLoader package missing module"); 527 assert(module->is_named(), "Boot classLoader package is in unnamed module"); 528 const char* module_name = module->name()->as_C_string(); 529 if (module_name != NULL) { 530 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size); 531 } 532 } 533 } 534 } 535 } 536 if (location != 0) { 537 if (UsePerfData) { 538 ClassLoader::perf_sys_classfile_bytes_read()->inc(size); 539 } 540 char* data = NEW_RESOURCE_ARRAY(char, size); 541 (*JImageGetResource)(_jimage, location, data, size); 542 // Resource allocated 543 return new ClassFileStream((u1*)data, 544 (int)size, 545 _name, 546 ClassFileStream::verify); 547 } 548 549 return NULL; 550 } 551 552 #ifndef PRODUCT 553 bool ctw_visitor(JImageFile* jimage, 554 const char* module_name, const char* version, const char* package, 555 const char* name, const char* extension, void* arg) { 556 if (strcmp(extension, "class") == 0) { 557 Thread* THREAD = Thread::current(); 558 ResourceMark rm(THREAD); 559 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JIMAGE_MAX_PATH); 560 jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name); 561 ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD); 562 return !HAS_PENDING_EXCEPTION; 563 } 564 return true; 565 } 566 567 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) { 568 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name()); 569 tty->cr(); 570 (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader); 571 if (HAS_PENDING_EXCEPTION) { 572 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 573 CLEAR_PENDING_EXCEPTION; 574 tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); 575 tty->print_cr("Increase class metadata storage if a limit was set"); 576 } else { 577 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); 578 } 579 } 580 } 581 #endif 582 583 bool ClassPathImageEntry::is_jrt() { 584 return ClassLoader::is_jrt(name()); 585 } 586 587 #if INCLUDE_CDS 588 void ClassLoader::exit_with_path_failure(const char* error, const char* message) { 589 assert(DumpSharedSpaces, "only called at dump time"); 590 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure"); 591 vm_exit_during_initialization(error, message); 592 } 593 #endif 594 595 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) { 596 _module_name = module_name; 597 _module_first_entry = NULL; 598 _module_last_entry = NULL; 599 } 600 601 ModuleClassPathList::~ModuleClassPathList() { 602 // Clean out each ClassPathEntry on list 603 ClassPathEntry* e = _module_first_entry; 604 while (e != NULL) { 605 ClassPathEntry* next_entry = e->next(); 606 delete e; 607 e = next_entry; 608 } 609 } 610 611 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) { 612 if (new_entry != NULL) { 613 if (_module_last_entry == NULL) { 614 _module_first_entry = _module_last_entry = new_entry; 615 } else { 616 _module_last_entry->set_next(new_entry); 617 _module_last_entry = new_entry; 618 } 619 } 620 } 621 622 void ClassLoader::trace_class_path(const char* msg, const char* name) { 623 if (log_is_enabled(Info, class, path)) { 624 ResourceMark rm; 625 outputStream* out = Log(class, path)::info_stream(); 626 if (msg) { 627 out->print("%s", msg); 628 } 629 if (name) { 630 if (strlen(name) < 256) { 631 out->print("%s", name); 632 } else { 633 // For very long paths, we need to print each character separately, 634 // as print_cr() has a length limit 635 while (name[0] != '\0') { 636 out->print("%c", name[0]); 637 name++; 638 } 639 } 640 } 641 out->cr(); 642 } 643 } 644 645 #if INCLUDE_CDS 646 void ClassLoader::check_shared_classpath(const char *path) { 647 if (strcmp(path, "") == 0) { 648 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL); 649 } 650 651 struct stat st; 652 if (os::stat(path, &st) == 0) { 653 if ((st.st_mode & S_IFMT) != S_IFREG) { // is not a regular file 654 if (!os::dir_is_empty(path)) { 655 tty->print_cr("Error: non-empty directory '%s'", path); 656 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL); 657 } 658 } 659 } 660 } 661 #endif 662 663 void ClassLoader::setup_bootstrap_search_path() { 664 const char* sys_class_path = Arguments::get_sysclasspath(); 665 const char* java_class_path = Arguments::get_appclasspath(); 666 if (PrintSharedArchiveAndExit) { 667 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily 668 // the same as the bootcp of the shared archive. 669 } else { 670 trace_class_path("bootstrap loader class path=", sys_class_path); 671 trace_class_path("classpath: ", java_class_path); 672 } 673 #if INCLUDE_CDS 674 if (DumpSharedSpaces) { 675 _shared_paths_misc_info->add_boot_classpath(sys_class_path); 676 } 677 #endif 678 setup_search_path(sys_class_path, true); 679 } 680 681 #if INCLUDE_CDS 682 int ClassLoader::get_shared_paths_misc_info_size() { 683 return _shared_paths_misc_info->get_used_bytes(); 684 } 685 686 void* ClassLoader::get_shared_paths_misc_info() { 687 return _shared_paths_misc_info->buffer(); 688 } 689 690 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) { 691 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size); 692 bool result = checker->check(); 693 delete checker; 694 return result; 695 } 696 #endif 697 698 // Construct the array of module/path pairs as specified to --patch-module 699 // for the boot loader to search ahead of the jimage, if the class being 700 // loaded is defined to a module that has been specified to --patch-module. 701 void ClassLoader::setup_patch_mod_entries() { 702 Thread* THREAD = Thread::current(); 703 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix(); 704 int num_of_entries = patch_mod_args->length(); 705 706 707 // Set up the boot loader's _patch_mod_entries list 708 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true); 709 710 for (int i = 0; i < num_of_entries; i++) { 711 const char* module_name = (patch_mod_args->at(i))->module_name(); 712 Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK); 713 assert(module_sym != NULL, "Failed to obtain Symbol for module name"); 714 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym); 715 716 char* class_path = (patch_mod_args->at(i))->path_string(); 717 int len = (int)strlen(class_path); 718 int end = 0; 719 // Iterate over the module's class path entries 720 for (int start = 0; start < len; start = end) { 721 while (class_path[end] && class_path[end] != os::path_separator()[0]) { 722 end++; 723 } 724 EXCEPTION_MARK; 725 ResourceMark rm(THREAD); 726 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1); 727 strncpy(path, &class_path[start], end - start); 728 path[end - start] = '\0'; 729 730 struct stat st; 731 if (os::stat(path, &st) == 0) { 732 // File or directory found 733 Thread* THREAD = Thread::current(); 734 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK); 735 // If the path specification is valid, enter it into this module's list 736 if (new_entry != NULL) { 737 module_cpl->add_to_list(new_entry); 738 } 739 } 740 741 while (class_path[end] == os::path_separator()[0]) { 742 end++; 743 } 744 } 745 746 // Record the module into the list of --patch-module entries only if 747 // valid ClassPathEntrys have been created 748 if (module_cpl->module_first_entry() != NULL) { 749 _patch_mod_entries->push(module_cpl); 750 } 751 } 752 } 753 754 // Determine whether the module has been patched via the command-line 755 // option --patch-module 756 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) { 757 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) { 758 int table_len = _patch_mod_entries->length(); 759 for (int i = 0; i < table_len; i++) { 760 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i); 761 if (module_name->fast_compare(patch_mod->module_name()) == 0) { 762 return true; 763 } 764 } 765 } 766 return false; 767 } 768 769 void ClassLoader::setup_search_path(const char *class_path, bool bootstrap_search) { 770 int len = (int)strlen(class_path); 771 int end = 0; 772 bool set_base_piece = bootstrap_search; 773 774 // Iterate over class path entries 775 for (int start = 0; start < len; start = end) { 776 while (class_path[end] && class_path[end] != os::path_separator()[0]) { 777 end++; 778 } 779 EXCEPTION_MARK; 780 ResourceMark rm(THREAD); 781 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1); 782 strncpy(path, &class_path[start], end - start); 783 path[end - start] = '\0'; 784 785 // The first time through the bootstrap_search setup, it must be determined 786 // what the base or core piece of the boot loader search is. Either a java runtime 787 // image is present or this is an exploded module build situation. 788 if (set_base_piece) { 789 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, "java.base"), 790 "Incorrect boot loader search path, no java runtime image or java.base exploded build"); 791 struct stat st; 792 if (os::stat(path, &st) == 0) { 793 // Directory found 794 Thread* THREAD = Thread::current(); 795 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK); 796 797 // Check for a jimage 798 if (Arguments::has_jimage()) { 799 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice"); 800 assert(new_entry != NULL && new_entry->is_jrt(), "No java runtime image present"); 801 _jrt_entry = new_entry; 802 ++_num_entries; 803 #if INCLUDE_CDS 804 if (DumpSharedSpaces) { 805 JImageFile *jimage = _jrt_entry->jimage(); 806 assert(jimage != NULL, "No java runtime image file present"); 807 ClassLoader::initialize_module_loader_map(jimage); 808 } 809 #endif 810 } 811 } else { 812 // If path does not exist, exit 813 vm_exit_during_initialization("Unable to establish the boot loader search path", path); 814 } 815 set_base_piece = false; 816 } else { 817 // Every entry on the system boot class path after the initial base piece, 818 // which is set by os::set_boot_path(), is considered an appended entry. 819 update_class_path_entry_list(path, false, bootstrap_search); 820 } 821 822 #if INCLUDE_CDS 823 if (DumpSharedSpaces) { 824 check_shared_classpath(path); 825 } 826 #endif 827 while (class_path[end] == os::path_separator()[0]) { 828 end++; 829 } 830 } 831 } 832 833 // During an exploded modules build, each module defined to the boot loader 834 // will be added to the ClassLoader::_exploded_entries array. 835 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) { 836 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable"); 837 838 // Set up the boot loader's _exploded_entries list 839 if (_exploded_entries == NULL) { 840 _exploded_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true); 841 } 842 843 // Find the module's symbol 844 ResourceMark rm(THREAD); 845 const char *module_name = module_sym->as_C_string(); 846 const char *home = Arguments::get_java_home(); 847 const char file_sep = os::file_separator()[0]; 848 // 10 represents the length of "modules" + 2 file separators + \0 849 size_t len = strlen(home) + strlen(module_name) + 10; 850 char *path = NEW_C_HEAP_ARRAY(char, len, mtModule); 851 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name); 852 853 struct stat st; 854 if (os::stat(path, &st) == 0) { 855 // Directory found 856 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK); 857 858 // If the path specification is valid, enter it into this module's list. 859 // There is no need to check for duplicate modules in the exploded entry list, 860 // since no two modules with the same name can be defined to the boot loader. 861 // This is checked at module definition time in Modules::define_module. 862 if (new_entry != NULL) { 863 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym); 864 module_cpl->add_to_list(new_entry); 865 _exploded_entries->push(module_cpl); 866 log_info(class, load)("path: %s", path); 867 } 868 } 869 FREE_C_HEAP_ARRAY(char, path); 870 } 871 872 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st, 873 bool throw_exception, 874 bool is_boot_append, TRAPS) { 875 JavaThread* thread = JavaThread::current(); 876 ClassPathEntry* new_entry = NULL; 877 if ((st->st_mode & S_IFMT) == S_IFREG) { 878 ResourceMark rm(thread); 879 // Regular file, should be a zip or jimage file 880 // Canonicalized filename 881 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN); 882 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 883 // This matches the classic VM 884 if (throw_exception) { 885 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL); 886 } else { 887 return NULL; 888 } 889 } 890 jint error; 891 JImageFile* jimage =(*JImageOpen)(canonical_path, &error); 892 if (jimage != NULL) { 893 new_entry = new ClassPathImageEntry(jimage, canonical_path); 894 } else { 895 char* error_msg = NULL; 896 jzfile* zip; 897 { 898 // enable call to C land 899 ThreadToNativeFromVM ttn(thread); 900 HandleMark hm(thread); 901 zip = (*ZipOpen)(canonical_path, &error_msg); 902 } 903 if (zip != NULL && error_msg == NULL) { 904 new_entry = new ClassPathZipEntry(zip, path, is_boot_append); 905 } else { 906 char *msg; 907 if (error_msg == NULL) { 908 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ; 909 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path); 910 } else { 911 int len = (int)(strlen(path) + strlen(error_msg) + 128); 912 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ; 913 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path); 914 } 915 // Don't complain about bad jar files added via -Xbootclasspath/a:. 916 if (throw_exception && is_init_completed()) { 917 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL); 918 } else { 919 return NULL; 920 } 921 } 922 } 923 log_info(class, path)("opened: %s", path); 924 log_info(class, load)("opened: %s", path); 925 } else { 926 // Directory 927 new_entry = new ClassPathDirEntry(path); 928 log_info(class, load)("path: %s", path); 929 } 930 return new_entry; 931 } 932 933 934 // Create a class path zip entry for a given path (return NULL if not found 935 // or zip/JAR file cannot be opened) 936 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) { 937 // check for a regular file 938 struct stat st; 939 if (os::stat(path, &st) == 0) { 940 if ((st.st_mode & S_IFMT) == S_IFREG) { 941 char canonical_path[JVM_MAXPATHLEN]; 942 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 943 char* error_msg = NULL; 944 jzfile* zip; 945 { 946 // enable call to C land 947 JavaThread* thread = JavaThread::current(); 948 ThreadToNativeFromVM ttn(thread); 949 HandleMark hm(thread); 950 zip = (*ZipOpen)(canonical_path, &error_msg); 951 } 952 if (zip != NULL && error_msg == NULL) { 953 // create using canonical path 954 return new ClassPathZipEntry(zip, canonical_path, is_boot_append); 955 } 956 } 957 } 958 } 959 return NULL; 960 } 961 962 // returns true if entry already on class path 963 bool ClassLoader::contains_append_entry(const char* name) { 964 ClassPathEntry* e = _first_append_entry; 965 while (e != NULL) { 966 // assume zip entries have been canonicalized 967 if (strcmp(name, e->name()) == 0) { 968 return true; 969 } 970 e = e->next(); 971 } 972 return false; 973 } 974 975 void ClassLoader::add_to_list(ClassPathEntry *new_entry) { 976 if (new_entry != NULL) { 977 if (_last_append_entry == NULL) { 978 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty"); 979 _first_append_entry = _last_append_entry = new_entry; 980 } else { 981 _last_append_entry->set_next(new_entry); 982 _last_append_entry = new_entry; 983 } 984 } 985 _num_entries++; 986 } 987 988 void ClassLoader::add_to_list(const char *apath) { 989 update_class_path_entry_list((char*)apath, false, false); 990 } 991 992 // Returns true IFF the file/dir exists and the entry was successfully created. 993 bool ClassLoader::update_class_path_entry_list(const char *path, 994 bool check_for_duplicates, 995 bool is_boot_append, 996 bool throw_exception) { 997 struct stat st; 998 if (os::stat(path, &st) == 0) { 999 // File or directory found 1000 ClassPathEntry* new_entry = NULL; 1001 Thread* THREAD = Thread::current(); 1002 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false)); 1003 if (new_entry == NULL) { 1004 return false; 1005 } 1006 1007 // Do not reorder the bootclasspath which would break get_system_package(). 1008 // Add new entry to linked list 1009 if (!check_for_duplicates || !contains_append_entry(new_entry->name())) { 1010 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry); 1011 } 1012 return true; 1013 } else { 1014 #if INCLUDE_CDS 1015 if (DumpSharedSpaces) { 1016 _shared_paths_misc_info->add_nonexist_path(path); 1017 } 1018 #endif 1019 return false; 1020 } 1021 } 1022 1023 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) { 1024 ResourceMark rm; 1025 int num_of_entries = module_list->length(); 1026 for (int i = 0; i < num_of_entries; i++) { 1027 ClassPathEntry* e; 1028 ModuleClassPathList* mpl = module_list->at(i); 1029 tty->print("%s=", mpl->module_name()->as_C_string()); 1030 e = mpl->module_first_entry(); 1031 while (e != NULL) { 1032 tty->print("%s", e->name()); 1033 e = e->next(); 1034 if (e != NULL) { 1035 tty->print("%s", os::path_separator()); 1036 } 1037 } 1038 tty->print(" ;"); 1039 } 1040 } 1041 1042 void ClassLoader::print_bootclasspath() { 1043 ClassPathEntry* e; 1044 tty->print("[bootclasspath= "); 1045 1046 // Print --patch-module module/path specifications first 1047 if (_patch_mod_entries != NULL) { 1048 print_module_entry_table(_patch_mod_entries); 1049 } 1050 1051 // [jimage | exploded modules build] 1052 if (has_jrt_entry()) { 1053 // Print the location of the java runtime image 1054 tty->print("%s ;", _jrt_entry->name()); 1055 } else { 1056 // Print exploded module build path specifications 1057 if (_exploded_entries != NULL) { 1058 print_module_entry_table(_exploded_entries); 1059 } 1060 } 1061 1062 // appended entries 1063 e = _first_append_entry; 1064 while (e != NULL) { 1065 tty->print("%s ;", e->name()); 1066 e = e->next(); 1067 } 1068 tty->print_cr("]"); 1069 } 1070 1071 void ClassLoader::load_zip_library() { 1072 assert(ZipOpen == NULL, "should not load zip library twice"); 1073 // First make sure native library is loaded 1074 os::native_java_library(); 1075 // Load zip library 1076 char path[JVM_MAXPATHLEN]; 1077 char ebuf[1024]; 1078 void* handle = NULL; 1079 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) { 1080 handle = os::dll_load(path, ebuf, sizeof ebuf); 1081 } 1082 if (handle == NULL) { 1083 vm_exit_during_initialization("Unable to load ZIP library", path); 1084 } 1085 // Lookup zip entry points 1086 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open")); 1087 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close")); 1088 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry")); 1089 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry")); 1090 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry")); 1091 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully")); 1092 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32")); 1093 FreeEntry = CAST_TO_FN_PTR(FreeEntry_t, os::dll_lookup(handle, "ZIP_FreeEntry")); 1094 1095 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL 1096 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL || 1097 GetNextEntry == NULL || Crc32 == NULL) { 1098 vm_exit_during_initialization("Corrupted ZIP library", path); 1099 } 1100 1101 if (ZipInflateFully == NULL) { 1102 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path); 1103 } 1104 1105 // Lookup canonicalize entry in libjava.dll 1106 void *javalib_handle = os::native_java_library(); 1107 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize")); 1108 // This lookup only works on 1.3. Do not check for non-null here 1109 } 1110 1111 void ClassLoader::load_jimage_library() { 1112 // First make sure native library is loaded 1113 os::native_java_library(); 1114 // Load jimage library 1115 char path[JVM_MAXPATHLEN]; 1116 char ebuf[1024]; 1117 void* handle = NULL; 1118 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) { 1119 handle = os::dll_load(path, ebuf, sizeof ebuf); 1120 } 1121 if (handle == NULL) { 1122 vm_exit_during_initialization("Unable to load jimage library", path); 1123 } 1124 1125 // Lookup jimage entry points 1126 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open")); 1127 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found"); 1128 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close")); 1129 guarantee(JImageClose != NULL, "function JIMAGE_Close not found"); 1130 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule")); 1131 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found"); 1132 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource")); 1133 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found"); 1134 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource")); 1135 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found"); 1136 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator")); 1137 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found"); 1138 JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath")); 1139 guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found"); 1140 } 1141 1142 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) { 1143 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg); 1144 } 1145 1146 int ClassLoader::crc32(int crc, const char* buf, int len) { 1147 assert(Crc32 != NULL, "ZIP_CRC32 is not found"); 1148 return (*Crc32)(crc, (const jbyte*)buf, len); 1149 } 1150 1151 #if INCLUDE_CDS 1152 void ClassLoader::initialize_module_loader_map(JImageFile* jimage) { 1153 if (!DumpSharedSpaces) { 1154 return; // only needed for CDS dump time 1155 } 1156 1157 ResourceMark rm; 1158 jlong size; 1159 JImageLocationRef location = (*JImageFindResource)(jimage, "java.base", get_jimage_version_string(), MODULE_LOADER_MAP, &size); 1160 if (location == 0) { 1161 vm_exit_during_initialization( 1162 "Cannot find ModuleLoaderMap location from modules jimage.", NULL); 1163 } 1164 char* buffer = NEW_RESOURCE_ARRAY(char, size + 1); 1165 buffer[size] = '\0'; 1166 jlong read = (*JImageGetResource)(jimage, location, buffer, size); 1167 if (read != size) { 1168 vm_exit_during_initialization( 1169 "Cannot find ModuleLoaderMap resource from modules jimage.", NULL); 1170 } 1171 char* char_buf = (char*)buffer; 1172 int buflen = (int)strlen(char_buf); 1173 char* begin_ptr = char_buf; 1174 char* end_ptr = strchr(begin_ptr, '\n'); 1175 bool process_boot_modules = false; 1176 _boot_modules_array = new (ResourceObj::C_HEAP, mtModule) 1177 GrowableArray<char*>(INITIAL_BOOT_MODULES_ARRAY_SIZE, true); 1178 _platform_modules_array = new (ResourceObj::C_HEAP, mtModule) 1179 GrowableArray<char*>(INITIAL_PLATFORM_MODULES_ARRAY_SIZE, true); 1180 while (end_ptr != NULL && (end_ptr - char_buf) < buflen) { 1181 // Allocate a buffer from the C heap to be appended to the _boot_modules_array 1182 // or the _platform_modules_array. 1183 char* temp_name = NEW_C_HEAP_ARRAY(char, (size_t)(end_ptr - begin_ptr + 1), mtInternal); 1184 strncpy(temp_name, begin_ptr, end_ptr - begin_ptr); 1185 temp_name[end_ptr - begin_ptr] = '\0'; 1186 if (strncmp(temp_name, "BOOT", 4) == 0) { 1187 process_boot_modules = true; 1188 FREE_C_HEAP_ARRAY(char, temp_name); 1189 } else if (strncmp(temp_name, "PLATFORM", 8) == 0) { 1190 process_boot_modules = false; 1191 FREE_C_HEAP_ARRAY(char, temp_name); 1192 } else { 1193 // module name 1194 if (process_boot_modules) { 1195 _boot_modules_array->append(temp_name); 1196 } else { 1197 _platform_modules_array->append(temp_name); 1198 } 1199 } 1200 begin_ptr = ++end_ptr; 1201 end_ptr = strchr(begin_ptr, '\n'); 1202 } 1203 } 1204 #endif 1205 1206 // Function add_package extracts the package from the fully qualified class name 1207 // and checks if the package is in the boot loader's package entry table. If so, 1208 // then it sets the classpath_index in the package entry record. 1209 // 1210 // The classpath_index field is used to find the entry on the boot loader class 1211 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a 1212 // in an unnamed module. It is also used to indicate (for all packages whose 1213 // classes are loaded by the boot loader) that at least one of the package's 1214 // classes has been loaded. 1215 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) { 1216 assert(fullq_class_name != NULL, "just checking"); 1217 1218 // Get package name from fully qualified class name. 1219 ResourceMark rm; 1220 const char *cp = package_from_name(fullq_class_name); 1221 if (cp != NULL) { 1222 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages(); 1223 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false); 1224 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol); 1225 if (pkg_entry != NULL) { 1226 assert(classpath_index != -1, "Unexpected classpath_index"); 1227 pkg_entry->set_classpath_index(classpath_index); 1228 } else { 1229 return false; 1230 } 1231 } 1232 return true; 1233 } 1234 1235 oop ClassLoader::get_system_package(const char* name, TRAPS) { 1236 // Look up the name in the boot loader's package entry table. 1237 if (name != NULL) { 1238 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL); 1239 // Look for the package entry in the boot loader's package entry table. 1240 PackageEntry* package = 1241 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym); 1242 1243 // Return NULL if package does not exist or if no classes in that package 1244 // have been loaded. 1245 if (package != NULL && package->has_loaded_class()) { 1246 ModuleEntry* module = package->module(); 1247 if (module->location() != NULL) { 1248 ResourceMark rm(THREAD); 1249 Handle ml = java_lang_String::create_from_str( 1250 module->location()->as_C_string(), THREAD); 1251 return ml(); 1252 } 1253 // Return entry on boot loader class path. 1254 Handle cph = java_lang_String::create_from_str( 1255 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD); 1256 return cph(); 1257 } 1258 } 1259 return NULL; 1260 } 1261 1262 objArrayOop ClassLoader::get_system_packages(TRAPS) { 1263 ResourceMark rm(THREAD); 1264 // List of pointers to PackageEntrys that have loaded classes. 1265 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50); 1266 { 1267 MutexLocker ml(Module_lock, THREAD); 1268 1269 PackageEntryTable* pe_table = 1270 ClassLoaderData::the_null_class_loader_data()->packages(); 1271 1272 // Collect the packages that have at least one loaded class. 1273 for (int x = 0; x < pe_table->table_size(); x++) { 1274 for (PackageEntry* package_entry = pe_table->bucket(x); 1275 package_entry != NULL; 1276 package_entry = package_entry->next()) { 1277 if (package_entry->has_loaded_class()) { 1278 loaded_class_pkgs->append(package_entry); 1279 } 1280 } 1281 } 1282 } 1283 1284 1285 // Allocate objArray and fill with java.lang.String 1286 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), 1287 loaded_class_pkgs->length(), CHECK_NULL); 1288 objArrayHandle result(THREAD, r); 1289 for (int x = 0; x < loaded_class_pkgs->length(); x++) { 1290 PackageEntry* package_entry = loaded_class_pkgs->at(x); 1291 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL); 1292 result->obj_at_put(x, str()); 1293 } 1294 return result(); 1295 } 1296 1297 #if INCLUDE_CDS 1298 s2 ClassLoader::module_to_classloader(const char* module_name) { 1299 1300 assert(DumpSharedSpaces, "dump time only"); 1301 assert(_boot_modules_array != NULL, "_boot_modules_array is NULL"); 1302 assert(_platform_modules_array != NULL, "_platform_modules_array is NULL"); 1303 1304 int array_size = _boot_modules_array->length(); 1305 for (int i = 0; i < array_size; i++) { 1306 if (strcmp(module_name, _boot_modules_array->at(i)) == 0) { 1307 return BOOT_LOADER; 1308 } 1309 } 1310 1311 array_size = _platform_modules_array->length(); 1312 for (int i = 0; i < array_size; i++) { 1313 if (strcmp(module_name, _platform_modules_array->at(i)) == 0) { 1314 return PLATFORM_LOADER; 1315 } 1316 } 1317 1318 return APP_LOADER; 1319 } 1320 1321 s2 ClassLoader::classloader_type(Symbol* class_name, ClassPathEntry* e, int classpath_index, TRAPS) { 1322 assert(DumpSharedSpaces, "Only used for CDS dump time"); 1323 1324 // obtain the classloader type based on the class name. 1325 // First obtain the package name based on the class name. Then obtain 1326 // the classloader type based on the package name from the jimage using 1327 // a jimage API. If the classloader type cannot be found from the 1328 // jimage, it is determined by the class path entry. 1329 jshort loader_type = ClassLoader::APP_LOADER; 1330 if (e->is_jrt()) { 1331 ResourceMark rm; 1332 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK_0); 1333 if (pkg_name != NULL) { 1334 const char* pkg_name_C_string = (const char*)(pkg_name->as_C_string()); 1335 ClassPathImageEntry* cpie = (ClassPathImageEntry*)e; 1336 JImageFile* jimage = cpie->jimage(); 1337 char* module_name = (char*)(*JImagePackageToModule)(jimage, pkg_name_C_string); 1338 if (module_name != NULL) { 1339 loader_type = ClassLoader::module_to_classloader(module_name); 1340 } 1341 } 1342 } else if (ClassLoaderExt::is_boot_classpath(classpath_index)) { 1343 loader_type = ClassLoader::BOOT_LOADER; 1344 } 1345 return loader_type; 1346 } 1347 #endif 1348 1349 // caller needs ResourceMark 1350 const char* ClassLoader::file_name_for_class_name(const char* class_name, 1351 int class_name_len) { 1352 assert(class_name != NULL, "invariant"); 1353 assert((int)strlen(class_name) == class_name_len, "invariant"); 1354 1355 static const char class_suffix[] = ".class"; 1356 1357 char* const file_name = NEW_RESOURCE_ARRAY(char, 1358 class_name_len + 1359 sizeof(class_suffix)); // includes term NULL 1360 1361 strncpy(file_name, class_name, class_name_len); 1362 strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix)); 1363 1364 return file_name; 1365 } 1366 1367 // Search either the patch-module or exploded build entries for class 1368 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list, 1369 const char* const class_name, const char* const file_name, TRAPS) { 1370 ClassFileStream* stream = NULL; 1371 1372 // Find the class' defining module in the boot loader's module entry table 1373 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL); 1374 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL; 1375 1376 // If the module system has not defined java.base yet, then 1377 // classes loaded are assumed to be defined to java.base. 1378 // When java.base is eventually defined by the module system, 1379 // all packages of classes that have been previously loaded 1380 // are verified in ModuleEntryTable::verify_javabase_packages(). 1381 if (!Universe::is_module_initialized() && 1382 !ModuleEntryTable::javabase_defined() && 1383 mod_entry == NULL) { 1384 mod_entry = ModuleEntryTable::javabase_moduleEntry(); 1385 } 1386 1387 // The module must be a named module 1388 if (mod_entry != NULL && mod_entry->is_named()) { 1389 int num_of_entries = module_list->length(); 1390 const Symbol* class_module_name = mod_entry->name(); 1391 1392 // Loop through all the modules in either the patch-module or exploded entries looking for module 1393 for (int i = 0; i < num_of_entries; i++) { 1394 ModuleClassPathList* module_cpl = module_list->at(i); 1395 Symbol* module_cpl_name = module_cpl->module_name(); 1396 1397 if (module_cpl_name->fast_compare(class_module_name) == 0) { 1398 // Class' module has been located, attempt to load 1399 // the class from the module's ClassPathEntry list. 1400 ClassPathEntry* e = module_cpl->module_first_entry(); 1401 while (e != NULL) { 1402 stream = e->open_stream(file_name, CHECK_NULL); 1403 // No context.check is required since CDS is not supported 1404 // for an exploded modules build or if --patch-module is specified. 1405 if (NULL != stream) { 1406 return stream; 1407 } 1408 e = e->next(); 1409 } 1410 // If the module was located, break out even if the class was not 1411 // located successfully from that module's ClassPathEntry list. 1412 // There will not be another valid entry for that module. 1413 return NULL; 1414 } 1415 } 1416 } 1417 1418 return NULL; 1419 } 1420 1421 #if INCLUDE_CDS 1422 // The following function is only used during CDS dump time. 1423 // It checks if a class can be found in the jar entries of the _patch_mod_entries. 1424 // It does not support non-jar entries. 1425 bool ClassLoader::is_in_patch_module(const char* const file_name) { 1426 assert(DumpSharedSpaces, "dump time only"); 1427 if (_patch_mod_entries == NULL) { 1428 return false; 1429 } 1430 1431 int num_of_entries = _patch_mod_entries->length(); 1432 char* class_module_name = NULL; 1433 ResourceMark rm; 1434 const char *pkg_name = package_from_name(file_name); 1435 // Using the jimage to obtain the class' module name. 1436 // The ModuleEntryTable cannot be used at this point during dump time 1437 // because the module system hasn't been initialized yet. 1438 if (pkg_name != NULL) { 1439 JImageFile *jimage = _jrt_entry->jimage(); 1440 class_module_name = (char*)(*JImagePackageToModule)(jimage, pkg_name); 1441 } 1442 1443 if (class_module_name == NULL) { 1444 return false; 1445 } 1446 1447 // Loop through all the patch module entries looking for module 1448 for (int i = 0; i < num_of_entries; i++) { 1449 ModuleClassPathList* module_cpl = _patch_mod_entries->at(i); 1450 Symbol* module_cpl_name = module_cpl->module_name(); 1451 1452 if (strcmp(module_cpl_name->as_C_string(), class_module_name) == 0) { 1453 // Class' module has been located, attempt to locate 1454 // the class from the module's ClassPathEntry list. 1455 ClassPathEntry* e = module_cpl->module_first_entry(); 1456 while (e != NULL) { 1457 if (e->is_jar_file()) { 1458 if (e->stream_exists(file_name)) { 1459 return true; 1460 } else { 1461 e = e->next(); 1462 } 1463 } 1464 } 1465 } 1466 } 1467 1468 return false; 1469 } 1470 #endif // INCLUDE_CDS 1471 1472 instanceKlassHandle ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) { 1473 assert(name != NULL, "invariant"); 1474 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 1475 1476 ResourceMark rm(THREAD); 1477 HandleMark hm(THREAD); 1478 1479 const char* const class_name = name->as_C_string(); 1480 1481 EventMark m("loading class %s", class_name); 1482 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion); 1483 1484 const char* const file_name = file_name_for_class_name(class_name, 1485 name->utf8_length()); 1486 assert(file_name != NULL, "invariant"); 1487 1488 ClassLoaderExt::Context context(class_name, file_name, THREAD); 1489 1490 // Lookup stream for parsing .class file 1491 ClassFileStream* stream = NULL; 1492 s2 classpath_index = 0; 1493 ClassPathEntry* e = NULL; 1494 1495 // If DumpSharedSpaces is true boot loader visibility boundaries are set to: 1496 // - [jimage] + [_first_append_entry to _last_append_entry] (all path entries). 1497 // If a class is found in the --patch-module entries, the class will not be included in the 1498 // CDS archive. Also, CDS is not supported if exploded module builds are used. 1499 // 1500 // If search_append_only is true, boot loader visibility boundaries are 1501 // set to be _first_append_entry to the end. This includes: 1502 // [-Xbootclasspath/a]; [jvmti appended entries] 1503 // 1504 // If both DumpSharedSpaces and search_append_only are false, boot loader 1505 // visibility boundaries are set to be the --patch-module entries plus the base piece. 1506 // This would include: 1507 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build] 1508 // 1509 // DumpSharedSpaces and search_append_only are mutually exclusive and cannot 1510 // be true at the same time. 1511 assert(!(DumpSharedSpaces && search_append_only), "DumpSharedSpaces and search_append_only are both true"); 1512 1513 // Load Attempt #1: --patch-module 1514 // Determine the class' defining module. If it appears in the _patch_mod_entries, 1515 // attempt to load the class from those locations specific to the module. 1516 // Specifications to --patch-module can contain a partial number of classes 1517 // that are part of the overall module definition. So if a particular class is not 1518 // found within its module specification, the search should continue to Load Attempt #2. 1519 // Note: The --patch-module entries are never searched if the boot loader's 1520 // visibility boundary is limited to only searching the append entries. 1521 if (_patch_mod_entries != NULL && !search_append_only) { 1522 if (!DumpSharedSpaces) { 1523 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL); 1524 } else { 1525 #if INCLUDE_CDS 1526 if (is_in_patch_module(file_name)) { 1527 tty->print_cr("Preload Warning: Skip archiving class %s found in --patch-module entry", class_name); 1528 return NULL; 1529 } 1530 #endif 1531 } 1532 } 1533 1534 // Load Attempt #2: [jimage | exploded build] 1535 if (!search_append_only && (NULL == stream)) { 1536 if (has_jrt_entry()) { 1537 e = _jrt_entry; 1538 stream = _jrt_entry->open_stream(file_name, CHECK_NULL); 1539 if (!context.check(stream, classpath_index)) { 1540 return NULL; 1541 } 1542 } else { 1543 // Exploded build - attempt to locate class in its defining module's location. 1544 assert(_exploded_entries != NULL, "No exploded build entries present"); 1545 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL); 1546 } 1547 } 1548 1549 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries] 1550 if ((search_append_only || DumpSharedSpaces) && (NULL == stream)) { 1551 // For the boot loader append path search, the starting classpath_index 1552 // for the appended piece is always 1 to account for either the 1553 // _jrt_entry or the _exploded_entries. 1554 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly"); 1555 classpath_index = 1; 1556 1557 e = _first_append_entry; 1558 while (e != NULL) { 1559 stream = e->open_stream(file_name, CHECK_NULL); 1560 if (!context.check(stream, classpath_index)) { 1561 return NULL; 1562 } 1563 if (NULL != stream) { 1564 break; 1565 } 1566 e = e->next(); 1567 ++classpath_index; 1568 } 1569 } 1570 1571 if (NULL == stream) { 1572 if (DumpSharedSpaces) { 1573 tty->print_cr("Preload Warning: Cannot find %s", class_name); 1574 } 1575 return NULL; 1576 } 1577 1578 stream->set_verify(context.should_verify(classpath_index)); 1579 1580 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 1581 Handle protection_domain; 1582 1583 instanceKlassHandle result = KlassFactory::create_from_stream(stream, 1584 name, 1585 loader_data, 1586 protection_domain, 1587 NULL, // host_klass 1588 NULL, // cp_patches 1589 THREAD); 1590 if (HAS_PENDING_EXCEPTION) { 1591 if (DumpSharedSpaces) { 1592 tty->print_cr("Preload Error: Failed to load %s", class_name); 1593 } 1594 return NULL; 1595 } 1596 1597 return context.record_result(name, e, classpath_index, result, THREAD); 1598 } 1599 1600 // Initialize the class loader's access to methods in libzip. Parse and 1601 // process the boot classpath into a list ClassPathEntry objects. Once 1602 // this list has been created, it must not change order (see class PackageInfo) 1603 // it can be appended to and is by jvmti and the kernel vm. 1604 1605 void ClassLoader::initialize() { 1606 EXCEPTION_MARK; 1607 1608 if (UsePerfData) { 1609 // jvmstat performance counters 1610 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time"); 1611 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime"); 1612 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self"); 1613 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime"); 1614 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self"); 1615 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime"); 1616 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self"); 1617 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses"); 1618 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses"); 1619 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses"); 1620 1621 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime"); 1622 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self"); 1623 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime"); 1624 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime"); 1625 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime"); 1626 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime"); 1627 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self"); 1628 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount"); 1629 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses"); 1630 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime"); 1631 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self"); 1632 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes"); 1633 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes"); 1634 1635 1636 // The following performance counters are added for measuring the impact 1637 // of the bug fix of 6365597. They are mainly focused on finding out 1638 // the behavior of system & user-defined classloader lock, whether 1639 // ClassLoader.loadClass/findClass is being called synchronized or not. 1640 // Also two additional counters are created to see whether 'UnsyncloadClass' 1641 // flag is being set or not and how many times load_instance_class call 1642 // fails with linkageError etc. 1643 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS, 1644 "systemLoaderLockContentionRate"); 1645 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS, 1646 "nonSystemLoaderLockContentionRate"); 1647 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS, 1648 "jvmFindLoadedClassNoLockCalls"); 1649 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS, 1650 "jvmDefineClassNoLockCalls"); 1651 1652 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS, 1653 "jniDefineClassNoLockCalls"); 1654 1655 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, 1656 "unsafeDefineClassCalls"); 1657 1658 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet"); 1659 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS, 1660 "loadInstanceClassFailRate"); 1661 1662 // increment the isUnsyncloadClass counter if UnsyncloadClass is set. 1663 if (UnsyncloadClass) { 1664 _isUnsyncloadClass->inc(); 1665 } 1666 } 1667 1668 // lookup zip library entry points 1669 load_zip_library(); 1670 // lookup jimage library entry points 1671 load_jimage_library(); 1672 #if INCLUDE_CDS 1673 // initialize search path 1674 if (DumpSharedSpaces) { 1675 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info(); 1676 } 1677 #endif 1678 setup_bootstrap_search_path(); 1679 } 1680 1681 #if INCLUDE_CDS 1682 // Capture all the --patch-module entries specified during CDS dump time. 1683 // It also captures the non-existing path(s) and the required file(s) during inspecting 1684 // the entries. 1685 void ClassLoader::setup_patch_mod_path() { 1686 assert(DumpSharedSpaces, "only used with -Xshare:dump"); 1687 ResourceMark rm; 1688 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix(); 1689 if (patch_mod_args != NULL) { 1690 int num_of_entries = patch_mod_args->length(); 1691 for (int i = 0; i < num_of_entries; i++) { 1692 const char* module_name = (patch_mod_args->at(i))->module_name(); 1693 const char* module_path = (patch_mod_args->at(i))->path_string(); 1694 int path_len = (int)strlen(module_path); 1695 int name_len = (int)strlen(module_name); 1696 int buf_len = name_len + path_len + 2; // add 2 for the '=' and NULL terminator 1697 int end = 0; 1698 char* buf = NEW_C_HEAP_ARRAY(char, buf_len, mtInternal); 1699 // Iterate over the module's class path entries 1700 for (int start = 0; start < path_len; start = end) { 1701 while (module_path[end] && module_path[end] != os::path_separator()[0]) { 1702 end++; 1703 } 1704 strncpy(buf, &module_path[start], end - start); 1705 buf[end - start] = '\0'; 1706 struct stat st; 1707 if (os::stat(buf, &st) != 0) { 1708 // File not found 1709 _shared_paths_misc_info->add_nonexist_path(buf); 1710 } else { 1711 if ((st.st_mode & S_IFMT) != S_IFREG) { // is not a regular file 1712 vm_exit_during_initialization( 1713 "--patch-module requires a regular file during dumping", buf); 1714 } else { 1715 _shared_paths_misc_info->add_required_file(buf); 1716 } 1717 } 1718 while (module_path[end] == os::path_separator()[0]) { 1719 end++; 1720 } 1721 }; 1722 jio_snprintf(buf, buf_len, "%s=%s", module_name, module_path); 1723 _shared_paths_misc_info->add_patch_mod_classpath((const char*)buf); 1724 _num_patch_mod_prefixes++; 1725 FREE_C_HEAP_ARRAY(char, buf); 1726 } 1727 } 1728 } 1729 1730 void ClassLoader::initialize_shared_path() { 1731 if (DumpSharedSpaces) { 1732 setup_patch_mod_path(); 1733 ClassLoaderExt::setup_search_paths(); 1734 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check() 1735 } 1736 } 1737 #endif 1738 1739 jlong ClassLoader::classloader_time_ms() { 1740 return UsePerfData ? 1741 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1; 1742 } 1743 1744 jlong ClassLoader::class_init_count() { 1745 return UsePerfData ? _perf_classes_inited->get_value() : -1; 1746 } 1747 1748 jlong ClassLoader::class_init_time_ms() { 1749 return UsePerfData ? 1750 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1; 1751 } 1752 1753 jlong ClassLoader::class_verify_time_ms() { 1754 return UsePerfData ? 1755 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1; 1756 } 1757 1758 jlong ClassLoader::class_link_count() { 1759 return UsePerfData ? _perf_classes_linked->get_value() : -1; 1760 } 1761 1762 jlong ClassLoader::class_link_time_ms() { 1763 return UsePerfData ? 1764 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1; 1765 } 1766 1767 int ClassLoader::compute_Object_vtable() { 1768 // hardwired for JDK1.2 -- would need to duplicate class file parsing 1769 // code to determine actual value from file 1770 // Would be value '11' if finals were in vtable 1771 int JDK_1_2_Object_vtable_size = 5; 1772 return JDK_1_2_Object_vtable_size * vtableEntry::size(); 1773 } 1774 1775 1776 void classLoader_init1() { 1777 ClassLoader::initialize(); 1778 } 1779 1780 // Complete the ClassPathEntry setup for the boot loader 1781 void ClassLoader::classLoader_init2(TRAPS) { 1782 // Setup the list of module/path pairs for --patch-module processing 1783 // This must be done after the SymbolTable is created in order 1784 // to use fast_compare on module names instead of a string compare. 1785 if (Arguments::get_patch_mod_prefix() != NULL) { 1786 setup_patch_mod_entries(); 1787 } 1788 1789 // Create the ModuleEntry for java.base 1790 create_javabase(); 1791 1792 // Setup the initial java.base/path pair for the exploded build entries. 1793 // As more modules are defined during module system initialization, more 1794 // entries will be added to the exploded build array. 1795 if (!has_jrt_entry()) { 1796 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds"); 1797 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds"); 1798 add_to_exploded_build_list(vmSymbols::java_base(), CHECK); 1799 } 1800 } 1801 1802 1803 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) { 1804 assert(orig != NULL && out != NULL && len > 0, "bad arguments"); 1805 if (CanonicalizeEntry != NULL) { 1806 JavaThread* THREAD = JavaThread::current(); 1807 JNIEnv* env = THREAD->jni_environment(); 1808 ResourceMark rm(THREAD); 1809 1810 // os::native_path writes into orig_copy 1811 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1); 1812 strcpy(orig_copy, orig); 1813 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) { 1814 return false; 1815 } 1816 } else { 1817 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing 1818 strncpy(out, orig, len); 1819 out[len - 1] = '\0'; 1820 } 1821 return true; 1822 } 1823 1824 void ClassLoader::create_javabase() { 1825 Thread* THREAD = Thread::current(); 1826 1827 // Create java.base's module entry for the boot 1828 // class loader prior to loading j.l.Ojbect. 1829 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 1830 1831 // Get module entry table 1832 ModuleEntryTable* null_cld_modules = null_cld->modules(); 1833 if (null_cld_modules == NULL) { 1834 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader"); 1835 } 1836 1837 { 1838 MutexLocker ml(Module_lock, THREAD); 1839 ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(NULL), vmSymbols::java_base(), NULL, NULL, null_cld); 1840 if (jb_module == NULL) { 1841 vm_exit_during_initialization("Unable to create ModuleEntry for java.base"); 1842 } 1843 ModuleEntryTable::set_javabase_moduleEntry(jb_module); 1844 } 1845 } 1846 1847 #ifndef PRODUCT 1848 1849 // CompileTheWorld 1850 // 1851 // Iterates over all class path entries and forces compilation of all methods 1852 // in all classes found. Currently, only zip/jar archives are searched. 1853 // 1854 // The classes are loaded by the Java level bootstrap class loader, and the 1855 // initializer is called. If DelayCompilationDuringStartup is true (default), 1856 // the interpreter will run the initialization code. Note that forcing 1857 // initialization in this way could potentially lead to initialization order 1858 // problems, in which case we could just force the initialization bit to be set. 1859 1860 1861 // We need to iterate over the contents of a zip/jar file, so we replicate the 1862 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile, 1863 // since jzfile already has a void* definition. 1864 // 1865 // Note that this is only used in debug mode. 1866 // 1867 // HotSpot integration note: 1868 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build 1869 1870 1871 // JDK 1.3 version 1872 typedef struct real_jzentry { /* Zip file entry */ 1873 char *name; /* entry name */ 1874 jint time; /* modification time */ 1875 jint size; /* size of uncompressed data */ 1876 jint csize; /* size of compressed data (zero if uncompressed) */ 1877 jint crc; /* crc of uncompressed data */ 1878 char *comment; /* optional zip file comment */ 1879 jbyte *extra; /* optional extra data */ 1880 jint pos; /* position of LOC header (if negative) or data */ 1881 } real_jzentry; 1882 1883 typedef struct real_jzfile { /* Zip file */ 1884 char *name; /* zip file name */ 1885 jint refs; /* number of active references */ 1886 jint fd; /* open file descriptor */ 1887 void *lock; /* read lock */ 1888 char *comment; /* zip file comment */ 1889 char *msg; /* zip error message */ 1890 void *entries; /* array of hash cells */ 1891 jint total; /* total number of entries */ 1892 unsigned short *table; /* Hash chain heads: indexes into entries */ 1893 jint tablelen; /* number of hash eads */ 1894 real_jzfile *next; /* next zip file in search list */ 1895 jzentry *cache; /* we cache the most recently freed jzentry */ 1896 /* Information on metadata names in META-INF directory */ 1897 char **metanames; /* array of meta names (may have null names) */ 1898 jint metacount; /* number of slots in metanames array */ 1899 /* If there are any per-entry comments, they are in the comments array */ 1900 char **comments; 1901 } real_jzfile; 1902 1903 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) { 1904 // For now we only compile all methods in all classes in zip/jar files 1905 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir); 1906 tty->cr(); 1907 } 1908 1909 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) { 1910 real_jzfile* zip = (real_jzfile*) _zip; 1911 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name); 1912 tty->cr(); 1913 // Iterate over all entries in zip file 1914 for (int n = 0; ; n++) { 1915 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n)); 1916 if (ze == NULL) break; 1917 ClassLoader::compile_the_world_in(ze->name, loader, CHECK); 1918 } 1919 if (HAS_PENDING_EXCEPTION) { 1920 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1921 CLEAR_PENDING_EXCEPTION; 1922 tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); 1923 tty->print_cr("Increase class metadata storage if a limit was set"); 1924 } else { 1925 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); 1926 } 1927 } 1928 } 1929 1930 void ClassLoader::compile_the_world() { 1931 EXCEPTION_MARK; 1932 HandleMark hm(THREAD); 1933 ResourceMark rm(THREAD); 1934 1935 assert(has_jrt_entry(), "Compile The World not supported with exploded module build"); 1936 1937 // Find bootstrap loader 1938 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader()); 1939 jlong start = os::javaTimeMillis(); 1940 1941 // Compile the world for the modular java runtime image 1942 _jrt_entry->compile_the_world(system_class_loader, CATCH); 1943 1944 // Iterate over all bootstrap class path appended entries 1945 ClassPathEntry* e = _first_append_entry; 1946 while (e != NULL) { 1947 assert(!e->is_jrt(), "A modular java runtime image is present on the list of appended entries"); 1948 e->compile_the_world(system_class_loader, CATCH); 1949 e = e->next(); 1950 } 1951 jlong end = os::javaTimeMillis(); 1952 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)", 1953 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start)); 1954 { 1955 // Print statistics as if before normal exit: 1956 extern void print_statistics(); 1957 print_statistics(); 1958 } 1959 vm_exit(0); 1960 } 1961 1962 int ClassLoader::_compile_the_world_class_counter = 0; 1963 int ClassLoader::_compile_the_world_method_counter = 0; 1964 static int _codecache_sweep_counter = 0; 1965 1966 // Filter out all exceptions except OOMs 1967 static void clear_pending_exception_if_not_oom(TRAPS) { 1968 if (HAS_PENDING_EXCEPTION && 1969 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1970 CLEAR_PENDING_EXCEPTION; 1971 } 1972 // The CHECK at the caller will propagate the exception out 1973 } 1974 1975 /** 1976 * Returns if the given method should be compiled when doing compile-the-world. 1977 * 1978 * TODO: This should be a private method in a CompileTheWorld class. 1979 */ 1980 static bool can_be_compiled(methodHandle m, int comp_level) { 1981 assert(CompileTheWorld, "must be"); 1982 1983 // It's not valid to compile a native wrapper for MethodHandle methods 1984 // that take a MemberName appendix since the bytecode signature is not 1985 // correct. 1986 vmIntrinsics::ID iid = m->intrinsic_id(); 1987 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) { 1988 return false; 1989 } 1990 1991 return CompilationPolicy::can_be_compiled(m, comp_level); 1992 } 1993 1994 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) { 1995 if (string_ends_with(name, ".class")) { 1996 // We have a .class file 1997 int len = (int)strlen(name); 1998 char buffer[2048]; 1999 strncpy(buffer, name, len - 6); 2000 buffer[len-6] = 0; 2001 // If the file has a period after removing .class, it's not really a 2002 // valid class file. The class loader will check everything else. 2003 if (strchr(buffer, '.') == NULL) { 2004 _compile_the_world_class_counter++; 2005 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return; 2006 2007 // Construct name without extension 2008 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK); 2009 // Use loader to load and initialize class 2010 Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD); 2011 instanceKlassHandle k (THREAD, ik); 2012 if (k.not_null() && !HAS_PENDING_EXCEPTION) { 2013 k->initialize(THREAD); 2014 } 2015 bool exception_occurred = HAS_PENDING_EXCEPTION; 2016 clear_pending_exception_if_not_oom(CHECK); 2017 if (CompileTheWorldPreloadClasses && k.not_null()) { 2018 ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD); 2019 if (HAS_PENDING_EXCEPTION) { 2020 // If something went wrong in preloading we just ignore it 2021 clear_pending_exception_if_not_oom(CHECK); 2022 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer); 2023 } 2024 } 2025 2026 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) { 2027 if (k.is_null() || exception_occurred) { 2028 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class 2029 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer); 2030 } else { 2031 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer); 2032 // Preload all classes to get around uncommon traps 2033 // Iterate over all methods in class 2034 int comp_level = CompilationPolicy::policy()->initial_compile_level(); 2035 for (int n = 0; n < k->methods()->length(); n++) { 2036 methodHandle m (THREAD, k->methods()->at(n)); 2037 if (can_be_compiled(m, comp_level)) { 2038 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) { 2039 // Give sweeper a chance to keep up with CTW 2040 VM_ForceSafepoint op; 2041 VMThread::execute(&op); 2042 _codecache_sweep_counter = 0; 2043 } 2044 // Force compilation 2045 CompileBroker::compile_method(m, InvocationEntryBci, comp_level, 2046 methodHandle(), 0, CompileTask::Reason_CTW, THREAD); 2047 if (HAS_PENDING_EXCEPTION) { 2048 clear_pending_exception_if_not_oom(CHECK); 2049 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 2050 } else { 2051 _compile_the_world_method_counter++; 2052 } 2053 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) { 2054 // Clobber the first compile and force second tier compilation 2055 CompiledMethod* nm = m->code(); 2056 if (nm != NULL && !m->is_method_handle_intrinsic()) { 2057 // Throw out the code so that the code cache doesn't fill up 2058 nm->make_not_entrant(); 2059 } 2060 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization, 2061 methodHandle(), 0, CompileTask::Reason_CTW, THREAD); 2062 if (HAS_PENDING_EXCEPTION) { 2063 clear_pending_exception_if_not_oom(CHECK); 2064 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 2065 } else { 2066 _compile_the_world_method_counter++; 2067 } 2068 } 2069 } else { 2070 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 2071 } 2072 2073 CompiledMethod* nm = m->code(); 2074 if (nm != NULL && !m->is_method_handle_intrinsic()) { 2075 // Throw out the code so that the code cache doesn't fill up 2076 nm->make_not_entrant(); 2077 } 2078 } 2079 } 2080 } 2081 } 2082 } 2083 } 2084 2085 #endif //PRODUCT 2086 2087 // Please keep following two functions at end of this file. With them placed at top or in middle of the file, 2088 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589. 2089 void PerfClassTraceTime::initialize() { 2090 if (!UsePerfData) return; 2091 2092 if (_eventp != NULL) { 2093 // increment the event counter 2094 _eventp->inc(); 2095 } 2096 2097 // stop the current active thread-local timer to measure inclusive time 2098 _prev_active_event = -1; 2099 for (int i=0; i < EVENT_TYPE_COUNT; i++) { 2100 if (_timers[i].is_active()) { 2101 assert(_prev_active_event == -1, "should have only one active timer"); 2102 _prev_active_event = i; 2103 _timers[i].stop(); 2104 } 2105 } 2106 2107 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) { 2108 // start the inclusive timer if not recursively called 2109 _t.start(); 2110 } 2111 2112 // start thread-local timer of the given event type 2113 if (!_timers[_event_type].is_active()) { 2114 _timers[_event_type].start(); 2115 } 2116 } 2117 2118 PerfClassTraceTime::~PerfClassTraceTime() { 2119 if (!UsePerfData) return; 2120 2121 // stop the thread-local timer as the event completes 2122 // and resume the thread-local timer of the event next on the stack 2123 _timers[_event_type].stop(); 2124 jlong selftime = _timers[_event_type].ticks(); 2125 2126 if (_prev_active_event >= 0) { 2127 _timers[_prev_active_event].start(); 2128 } 2129 2130 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return; 2131 2132 // increment the counters only on the leaf call 2133 _t.stop(); 2134 _timep->inc(_t.ticks()); 2135 if (_selftimep != NULL) { 2136 _selftimep->inc(selftime); 2137 } 2138 // add all class loading related event selftime to the accumulated time counter 2139 ClassLoader::perf_accumulated_time()->inc(selftime); 2140 2141 // reset the timer 2142 _timers[_event_type].reset(); 2143 }