1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "jvm.h" 27 #include "classfile/classFileStream.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/classLoaderData.inline.hpp" 30 #include "classfile/classLoaderExt.hpp" 31 #include "classfile/javaClasses.hpp" 32 #include "classfile/jimage.hpp" 33 #include "classfile/moduleEntry.hpp" 34 #include "classfile/modules.hpp" 35 #include "classfile/packageEntry.hpp" 36 #include "classfile/klassFactory.hpp" 37 #include "classfile/systemDictionary.hpp" 38 #include "classfile/vmSymbols.hpp" 39 #include "compiler/compileBroker.hpp" 40 #include "gc/shared/collectedHeap.inline.hpp" 41 #include "gc/shared/generation.hpp" 42 #include "interpreter/bytecodeStream.hpp" 43 #include "interpreter/oopMapCache.hpp" 44 #include "logging/log.hpp" 45 #include "logging/logStream.hpp" 46 #include "logging/logTag.hpp" 47 #include "memory/allocation.inline.hpp" 48 #include "memory/filemap.hpp" 49 #include "memory/oopFactory.hpp" 50 #include "memory/resourceArea.hpp" 51 #include "memory/universe.inline.hpp" 52 #include "oops/instanceKlass.hpp" 53 #include "oops/instanceRefKlass.hpp" 54 #include "oops/objArrayOop.inline.hpp" 55 #include "oops/oop.inline.hpp" 56 #include "oops/symbol.hpp" 57 #include "prims/jvm_misc.hpp" 58 #include "runtime/arguments.hpp" 59 #include "runtime/compilationPolicy.hpp" 60 #include "runtime/handles.hpp" 61 #include "runtime/handles.inline.hpp" 62 #include "runtime/init.hpp" 63 #include "runtime/interfaceSupport.hpp" 64 #include "runtime/java.hpp" 65 #include "runtime/javaCalls.hpp" 66 #include "runtime/os.hpp" 67 #include "runtime/threadCritical.hpp" 68 #include "runtime/timer.hpp" 69 #include "runtime/vm_version.hpp" 70 #include "services/management.hpp" 71 #include "services/threadService.hpp" 72 #include "utilities/events.hpp" 73 #include "utilities/hashtable.inline.hpp" 74 #include "utilities/macros.hpp" 75 #if INCLUDE_CDS 76 #include "classfile/sharedClassUtil.hpp" 77 #include "classfile/sharedPathsMiscInfo.hpp" 78 #endif 79 80 // Entry points in zip.dll for loading zip/jar file entries 81 82 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg); 83 typedef void (JNICALL *ZipClose_t)(jzfile *zip); 84 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen); 85 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf); 86 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n); 87 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg); 88 typedef jint (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len); 89 90 static ZipOpen_t ZipOpen = NULL; 91 static ZipClose_t ZipClose = NULL; 92 static FindEntry_t FindEntry = NULL; 93 static ReadEntry_t ReadEntry = 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 int ClassLoader::_num_boot_entries = -1; 150 #if INCLUDE_CDS 151 GrowableArray<char*>* ClassLoader::_boot_modules_array = NULL; 152 GrowableArray<char*>* ClassLoader::_platform_modules_array = NULL; 153 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL; 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 PackageEntry* ClassLoader::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 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) { 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; 329 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len); 330 if (entry == NULL) return NULL; 331 u1* buffer; 332 char name_buf[128]; 333 char* filename; 334 if (name_len < 128) { 335 filename = name_buf; 336 } else { 337 filename = NEW_RESOURCE_ARRAY(char, name_len + 1); 338 } 339 340 // read contents into resource array 341 int size = (*filesize) + ((nul_terminate) ? 1 : 0); 342 buffer = NEW_RESOURCE_ARRAY(u1, size); 343 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL; 344 345 // return result 346 if (nul_terminate) { 347 buffer[*filesize] = 0; 348 } 349 return buffer; 350 } 351 352 #if INCLUDE_CDS 353 u1* ClassPathZipEntry::open_versioned_entry(const char* name, jint* filesize, TRAPS) { 354 u1* buffer = NULL; 355 if (DumpSharedSpaces && !_is_boot_append) { 356 // We presume default is multi-release enabled 357 const char* multi_ver = Arguments::get_property("jdk.util.jar.enableMultiRelease"); 358 const char* verstr = Arguments::get_property("jdk.util.jar.version"); 359 bool is_multi_ver = (multi_ver == NULL || 360 strcmp(multi_ver, "true") == 0 || 361 strcmp(multi_ver, "force") == 0) && 362 is_multiple_versioned(THREAD); 363 // command line version setting 364 int version = 0; 365 const int base_version = 8; // JDK8 366 int cur_ver = JDK_Version::current().major_version(); 367 if (verstr != NULL) { 368 version = atoi(verstr); 369 if (version < base_version || version > cur_ver) { 370 // If the specified version is lower than the base version, the base 371 // entry will be used; if the version is higher than the current 372 // jdk version, the highest versioned entry will be used. 373 if (version < base_version) { 374 is_multi_ver = false; 375 } 376 // print out warning, do not use assertion here since it will continue to look 377 // for proper version. 378 warning("JDK%d is not supported in multiple version jars", version); 379 } 380 } 381 382 if (is_multi_ver) { 383 int n; 384 char* entry_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN); 385 if (version > 0) { 386 n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", version, name); 387 entry_name[n] = '\0'; 388 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL); 389 if (buffer == NULL) { 390 warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name); 391 } 392 } 393 if (buffer == NULL) { 394 for (int i = cur_ver; i >= base_version; i--) { 395 n = jio_snprintf(entry_name, JVM_MAXPATHLEN, "META-INF/versions/%d/%s", i, name); 396 entry_name[n] = '\0'; 397 buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL); 398 if (buffer != NULL) { 399 break; 400 } 401 } 402 } 403 FREE_RESOURCE_ARRAY(char, entry_name, JVM_MAXPATHLEN); 404 } 405 } 406 return buffer; 407 } 408 409 bool ClassPathZipEntry::is_multiple_versioned(TRAPS) { 410 assert(DumpSharedSpaces, "called only at dump time"); 411 if (_multi_versioned != _unknown) { 412 return (_multi_versioned == _yes) ? true : false; 413 } 414 jint size; 415 char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, true, CHECK_false); 416 if (buffer != NULL) { 417 char* p = buffer; 418 for ( ; *p; ++p) *p = tolower(*p); 419 if (strstr(buffer, "multi-release: true") != NULL) { 420 _multi_versioned = _yes; 421 return true; 422 } 423 } 424 _multi_versioned = _no; 425 return false; 426 } 427 #endif // INCLUDE_CDS 428 429 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) { 430 jint filesize; 431 u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL); 432 if (buffer == NULL) { 433 buffer = open_entry(name, &filesize, false, CHECK_NULL); 434 if (buffer == NULL) { 435 return NULL; 436 } 437 } 438 if (UsePerfData) { 439 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize); 440 } 441 // Resource allocated 442 return new ClassFileStream(buffer, 443 filesize, 444 _zip_name, 445 ClassFileStream::verify); 446 } 447 448 // invoke function for each entry in the zip file 449 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) { 450 JavaThread* thread = JavaThread::current(); 451 HandleMark handle_mark(thread); 452 ThreadToNativeFromVM ttn(thread); 453 for (int n = 0; ; n++) { 454 jzentry * ze = ((*GetNextEntry)(_zip, n)); 455 if (ze == NULL) break; 456 (*f)(ze->name, context); 457 } 458 } 459 460 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) : 461 ClassPathEntry(), 462 _jimage(jimage) { 463 guarantee(jimage != NULL, "jimage file is null"); 464 guarantee(name != NULL, "jimage file name is null"); 465 size_t len = strlen(name) + 1; 466 _name = NEW_C_HEAP_ARRAY(const char, len, mtClass); 467 strncpy((char *)_name, name, len); 468 } 469 470 ClassPathImageEntry::~ClassPathImageEntry() { 471 if (_name != NULL) { 472 FREE_C_HEAP_ARRAY(const char, _name); 473 _name = NULL; 474 } 475 if (_jimage != NULL) { 476 (*JImageClose)(_jimage); 477 _jimage = NULL; 478 } 479 } 480 481 // For a class in a named module, look it up in the jimage file using this syntax: 482 // /<module-name>/<package-name>/<base-class> 483 // 484 // Assumptions: 485 // 1. There are no unnamed modules in the jimage file. 486 // 2. A package is in at most one module in the jimage file. 487 // 488 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) { 489 jlong size; 490 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size); 491 492 if (location == 0) { 493 ResourceMark rm; 494 const char* pkg_name = ClassLoader::package_from_name(name); 495 496 if (pkg_name != NULL) { 497 if (!Universe::is_module_initialized()) { 498 location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size); 499 #if INCLUDE_CDS 500 // CDS uses the boot class loader to load classes whose packages are in 501 // modules defined for other class loaders. So, for now, get their module 502 // names from the "modules" jimage file. 503 if (DumpSharedSpaces && location == 0) { 504 const char* module_name = (*JImagePackageToModule)(_jimage, pkg_name); 505 if (module_name != NULL) { 506 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size); 507 } 508 } 509 #endif 510 511 } else { 512 PackageEntry* package_entry = ClassLoader::get_package_entry(name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL); 513 if (package_entry != NULL) { 514 ResourceMark rm; 515 // Get the module name 516 ModuleEntry* module = package_entry->module(); 517 assert(module != NULL, "Boot classLoader package missing module"); 518 assert(module->is_named(), "Boot classLoader package is in unnamed module"); 519 const char* module_name = module->name()->as_C_string(); 520 if (module_name != NULL) { 521 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size); 522 } 523 } 524 } 525 } 526 } 527 if (location != 0) { 528 if (UsePerfData) { 529 ClassLoader::perf_sys_classfile_bytes_read()->inc(size); 530 } 531 char* data = NEW_RESOURCE_ARRAY(char, size); 532 (*JImageGetResource)(_jimage, location, data, size); 533 // Resource allocated 534 return new ClassFileStream((u1*)data, 535 (int)size, 536 _name, 537 ClassFileStream::verify); 538 } 539 540 return NULL; 541 } 542 543 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf, 544 const char* module_name, 545 const char* file_name, 546 jlong &size) { 547 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size)); 548 } 549 550 #ifndef PRODUCT 551 bool ctw_visitor(JImageFile* jimage, 552 const char* module_name, const char* version, const char* package, 553 const char* name, const char* extension, void* arg) { 554 if (strcmp(extension, "class") == 0) { 555 Thread* THREAD = Thread::current(); 556 ResourceMark rm(THREAD); 557 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JIMAGE_MAX_PATH); 558 jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name); 559 ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD); 560 return !HAS_PENDING_EXCEPTION; 561 } 562 return true; 563 } 564 565 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) { 566 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name()); 567 tty->cr(); 568 (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader); 569 if (HAS_PENDING_EXCEPTION) { 570 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 571 CLEAR_PENDING_EXCEPTION; 572 tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); 573 tty->print_cr("Increase class metadata storage if a limit was set"); 574 } else { 575 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); 576 } 577 } 578 } 579 #endif 580 581 bool ClassPathImageEntry::is_modules_image() const { 582 return ClassLoader::is_modules_image(name()); 583 } 584 585 #if INCLUDE_CDS 586 void ClassLoader::exit_with_path_failure(const char* error, const char* message) { 587 assert(DumpSharedSpaces, "only called at dump time"); 588 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure"); 589 vm_exit_during_initialization(error, message); 590 } 591 #endif 592 593 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) { 594 _module_name = module_name; 595 _module_first_entry = NULL; 596 _module_last_entry = NULL; 597 } 598 599 ModuleClassPathList::~ModuleClassPathList() { 600 // Clean out each ClassPathEntry on list 601 ClassPathEntry* e = _module_first_entry; 602 while (e != NULL) { 603 ClassPathEntry* next_entry = e->next(); 604 delete e; 605 e = next_entry; 606 } 607 } 608 609 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) { 610 if (new_entry != NULL) { 611 if (_module_last_entry == NULL) { 612 _module_first_entry = _module_last_entry = new_entry; 613 } else { 614 _module_last_entry->set_next(new_entry); 615 _module_last_entry = new_entry; 616 } 617 } 618 } 619 620 void ClassLoader::trace_class_path(const char* msg, const char* name) { 621 LogTarget(Info, class, path) lt; 622 if (lt.is_enabled()) { 623 LogStream ls(lt); 624 if (msg) { 625 ls.print("%s", msg); 626 } 627 if (name) { 628 if (strlen(name) < 256) { 629 ls.print("%s", name); 630 } else { 631 // For very long paths, we need to print each character separately, 632 // as print_cr() has a length limit 633 while (name[0] != '\0') { 634 ls.print("%c", name[0]); 635 name++; 636 } 637 } 638 } 639 ls.cr(); 640 } 641 } 642 643 #if INCLUDE_CDS 644 void ClassLoader::check_shared_classpath(const char *path) { 645 if (strcmp(path, "") == 0) { 646 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL); 647 } 648 649 struct stat st; 650 if (os::stat(path, &st) == 0) { 651 if ((st.st_mode & S_IFMT) != S_IFREG) { // is not a regular file 652 if (!os::dir_is_empty(path)) { 653 tty->print_cr("Error: non-empty directory '%s'", path); 654 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL); 655 } 656 } 657 } 658 } 659 #endif 660 661 void ClassLoader::setup_bootstrap_search_path() { 662 const char* sys_class_path = Arguments::get_sysclasspath(); 663 const char* java_class_path = Arguments::get_appclasspath(); 664 if (PrintSharedArchiveAndExit) { 665 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily 666 // the same as the bootcp of the shared archive. 667 } else { 668 trace_class_path("bootstrap loader class path=", sys_class_path); 669 trace_class_path("classpath: ", java_class_path); 670 } 671 #if INCLUDE_CDS 672 if (DumpSharedSpaces) { 673 _shared_paths_misc_info->add_boot_classpath(sys_class_path); 674 } 675 #endif 676 setup_search_path(sys_class_path, true); 677 } 678 679 #if INCLUDE_CDS 680 int ClassLoader::get_shared_paths_misc_info_size() { 681 return _shared_paths_misc_info->get_used_bytes(); 682 } 683 684 void* ClassLoader::get_shared_paths_misc_info() { 685 return _shared_paths_misc_info->buffer(); 686 } 687 688 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) { 689 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size); 690 bool result = checker->check(); 691 delete checker; 692 return result; 693 } 694 #endif 695 696 // Construct the array of module/path pairs as specified to --patch-module 697 // for the boot loader to search ahead of the jimage, if the class being 698 // loaded is defined to a module that has been specified to --patch-module. 699 void ClassLoader::setup_patch_mod_entries() { 700 Thread* THREAD = Thread::current(); 701 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix(); 702 int num_of_entries = patch_mod_args->length(); 703 704 705 // Set up the boot loader's _patch_mod_entries list 706 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true); 707 708 for (int i = 0; i < num_of_entries; i++) { 709 const char* module_name = (patch_mod_args->at(i))->module_name(); 710 Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK); 711 assert(module_sym != NULL, "Failed to obtain Symbol for module name"); 712 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym); 713 714 char* class_path = (patch_mod_args->at(i))->path_string(); 715 int len = (int)strlen(class_path); 716 int end = 0; 717 // Iterate over the module's class path entries 718 for (int start = 0; start < len; start = end) { 719 while (class_path[end] && class_path[end] != os::path_separator()[0]) { 720 end++; 721 } 722 EXCEPTION_MARK; 723 ResourceMark rm(THREAD); 724 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1); 725 strncpy(path, &class_path[start], end - start); 726 path[end - start] = '\0'; 727 728 struct stat st; 729 if (os::stat(path, &st) == 0) { 730 // File or directory found 731 Thread* THREAD = Thread::current(); 732 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK); 733 // If the path specification is valid, enter it into this module's list 734 if (new_entry != NULL) { 735 module_cpl->add_to_list(new_entry); 736 } 737 } 738 739 while (class_path[end] == os::path_separator()[0]) { 740 end++; 741 } 742 } 743 744 // Record the module into the list of --patch-module entries only if 745 // valid ClassPathEntrys have been created 746 if (module_cpl->module_first_entry() != NULL) { 747 _patch_mod_entries->push(module_cpl); 748 } 749 } 750 } 751 752 // Determine whether the module has been patched via the command-line 753 // option --patch-module 754 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) { 755 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) { 756 int table_len = _patch_mod_entries->length(); 757 for (int i = 0; i < table_len; i++) { 758 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i); 759 if (module_name->fast_compare(patch_mod->module_name()) == 0) { 760 return true; 761 } 762 } 763 } 764 return false; 765 } 766 767 void ClassLoader::setup_search_path(const char *class_path, bool bootstrap_search) { 768 int len = (int)strlen(class_path); 769 int end = 0; 770 bool set_base_piece = bootstrap_search; 771 772 // Iterate over class path entries 773 for (int start = 0; start < len; start = end) { 774 while (class_path[end] && class_path[end] != os::path_separator()[0]) { 775 end++; 776 } 777 EXCEPTION_MARK; 778 ResourceMark rm(THREAD); 779 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1); 780 strncpy(path, &class_path[start], end - start); 781 path[end - start] = '\0'; 782 783 // The first time through the bootstrap_search setup, it must be determined 784 // what the base or core piece of the boot loader search is. Either a java runtime 785 // image is present or this is an exploded module build situation. 786 if (set_base_piece) { 787 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME), 788 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build"); 789 struct stat st; 790 if (os::stat(path, &st) == 0) { 791 // Directory found 792 Thread* THREAD = Thread::current(); 793 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK); 794 795 // Check for a jimage 796 if (Arguments::has_jimage()) { 797 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice"); 798 assert(new_entry != NULL && new_entry->is_modules_image(), "No java runtime image present"); 799 _jrt_entry = new_entry; 800 ++_num_entries; 801 #if INCLUDE_CDS 802 if (DumpSharedSpaces) { 803 JImageFile *jimage = _jrt_entry->jimage(); 804 assert(jimage != NULL, "No java runtime image file present"); 805 } 806 #endif 807 } 808 } else { 809 // If path does not exist, exit 810 vm_exit_during_initialization("Unable to establish the boot loader search path", path); 811 } 812 set_base_piece = false; 813 } else { 814 // Every entry on the system boot class path after the initial base piece, 815 // which is set by os::set_boot_path(), is considered an appended entry. 816 update_class_path_entry_list(path, false, bootstrap_search); 817 } 818 819 #if INCLUDE_CDS 820 if (DumpSharedSpaces) { 821 check_shared_classpath(path); 822 } 823 #endif 824 while (class_path[end] == os::path_separator()[0]) { 825 end++; 826 } 827 } 828 } 829 830 // During an exploded modules build, each module defined to the boot loader 831 // will be added to the ClassLoader::_exploded_entries array. 832 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) { 833 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable"); 834 assert(_exploded_entries != NULL, "_exploded_entries was not initialized"); 835 836 // Find the module's symbol 837 ResourceMark rm(THREAD); 838 const char *module_name = module_sym->as_C_string(); 839 const char *home = Arguments::get_java_home(); 840 const char file_sep = os::file_separator()[0]; 841 // 10 represents the length of "modules" + 2 file separators + \0 842 size_t len = strlen(home) + strlen(module_name) + 10; 843 char *path = NEW_C_HEAP_ARRAY(char, len, mtModule); 844 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name); 845 846 struct stat st; 847 if (os::stat(path, &st) == 0) { 848 // Directory found 849 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK); 850 851 // If the path specification is valid, enter it into this module's list. 852 // There is no need to check for duplicate modules in the exploded entry list, 853 // since no two modules with the same name can be defined to the boot loader. 854 // This is checked at module definition time in Modules::define_module. 855 if (new_entry != NULL) { 856 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym); 857 module_cpl->add_to_list(new_entry); 858 { 859 MutexLocker ml(Module_lock, THREAD); 860 _exploded_entries->push(module_cpl); 861 } 862 log_info(class, load)("path: %s", path); 863 } 864 } 865 FREE_C_HEAP_ARRAY(char, path); 866 } 867 868 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st, 869 bool throw_exception, 870 bool is_boot_append, TRAPS) { 871 JavaThread* thread = JavaThread::current(); 872 ClassPathEntry* new_entry = NULL; 873 if ((st->st_mode & S_IFMT) == S_IFREG) { 874 ResourceMark rm(thread); 875 // Regular file, should be a zip or jimage file 876 // Canonicalized filename 877 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN); 878 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 879 // This matches the classic VM 880 if (throw_exception) { 881 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL); 882 } else { 883 return NULL; 884 } 885 } 886 jint error; 887 JImageFile* jimage =(*JImageOpen)(canonical_path, &error); 888 if (jimage != NULL) { 889 new_entry = new ClassPathImageEntry(jimage, canonical_path); 890 } else { 891 char* error_msg = NULL; 892 jzfile* zip; 893 { 894 // enable call to C land 895 ThreadToNativeFromVM ttn(thread); 896 HandleMark hm(thread); 897 zip = (*ZipOpen)(canonical_path, &error_msg); 898 } 899 if (zip != NULL && error_msg == NULL) { 900 new_entry = new ClassPathZipEntry(zip, path, is_boot_append); 901 } else { 902 char *msg; 903 if (error_msg == NULL) { 904 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ; 905 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path); 906 } else { 907 int len = (int)(strlen(path) + strlen(error_msg) + 128); 908 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ; 909 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path); 910 } 911 // Don't complain about bad jar files added via -Xbootclasspath/a:. 912 if (throw_exception && is_init_completed()) { 913 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL); 914 } else { 915 return NULL; 916 } 917 } 918 } 919 log_info(class, path)("opened: %s", path); 920 log_info(class, load)("opened: %s", path); 921 } else { 922 // Directory 923 new_entry = new ClassPathDirEntry(path); 924 log_info(class, load)("path: %s", path); 925 } 926 return new_entry; 927 } 928 929 930 // Create a class path zip entry for a given path (return NULL if not found 931 // or zip/JAR file cannot be opened) 932 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) { 933 // check for a regular file 934 struct stat st; 935 if (os::stat(path, &st) == 0) { 936 if ((st.st_mode & S_IFMT) == S_IFREG) { 937 char canonical_path[JVM_MAXPATHLEN]; 938 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 939 char* error_msg = NULL; 940 jzfile* zip; 941 { 942 // enable call to C land 943 JavaThread* thread = JavaThread::current(); 944 ThreadToNativeFromVM ttn(thread); 945 HandleMark hm(thread); 946 zip = (*ZipOpen)(canonical_path, &error_msg); 947 } 948 if (zip != NULL && error_msg == NULL) { 949 // create using canonical path 950 return new ClassPathZipEntry(zip, canonical_path, is_boot_append); 951 } 952 } 953 } 954 } 955 return NULL; 956 } 957 958 // returns true if entry already on class path 959 bool ClassLoader::contains_append_entry(const char* name) { 960 ClassPathEntry* e = _first_append_entry; 961 while (e != NULL) { 962 // assume zip entries have been canonicalized 963 if (strcmp(name, e->name()) == 0) { 964 return true; 965 } 966 e = e->next(); 967 } 968 return false; 969 } 970 971 void ClassLoader::add_to_list(ClassPathEntry *new_entry) { 972 if (new_entry != NULL) { 973 if (_last_append_entry == NULL) { 974 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty"); 975 _first_append_entry = _last_append_entry = new_entry; 976 } else { 977 _last_append_entry->set_next(new_entry); 978 _last_append_entry = new_entry; 979 } 980 } 981 _num_entries++; 982 } 983 984 void ClassLoader::add_to_list(const char *apath) { 985 update_class_path_entry_list((char*)apath, false, false); 986 } 987 988 // Returns true IFF the file/dir exists and the entry was successfully created. 989 bool ClassLoader::update_class_path_entry_list(const char *path, 990 bool check_for_duplicates, 991 bool is_boot_append, 992 bool throw_exception) { 993 struct stat st; 994 if (os::stat(path, &st) == 0) { 995 // File or directory found 996 ClassPathEntry* new_entry = NULL; 997 Thread* THREAD = Thread::current(); 998 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false)); 999 if (new_entry == NULL) { 1000 return false; 1001 } 1002 1003 // Do not reorder the bootclasspath which would break get_system_package(). 1004 // Add new entry to linked list 1005 if (!check_for_duplicates || !contains_append_entry(new_entry->name())) { 1006 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry); 1007 } 1008 return true; 1009 } else { 1010 #if INCLUDE_CDS 1011 if (DumpSharedSpaces) { 1012 _shared_paths_misc_info->add_nonexist_path(path); 1013 } 1014 #endif 1015 return false; 1016 } 1017 } 1018 1019 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) { 1020 ResourceMark rm; 1021 int num_of_entries = module_list->length(); 1022 for (int i = 0; i < num_of_entries; i++) { 1023 ClassPathEntry* e; 1024 ModuleClassPathList* mpl = module_list->at(i); 1025 tty->print("%s=", mpl->module_name()->as_C_string()); 1026 e = mpl->module_first_entry(); 1027 while (e != NULL) { 1028 tty->print("%s", e->name()); 1029 e = e->next(); 1030 if (e != NULL) { 1031 tty->print("%s", os::path_separator()); 1032 } 1033 } 1034 tty->print(" ;"); 1035 } 1036 } 1037 1038 void ClassLoader::print_bootclasspath() { 1039 ClassPathEntry* e; 1040 tty->print("[bootclasspath= "); 1041 1042 // Print --patch-module module/path specifications first 1043 if (_patch_mod_entries != NULL) { 1044 print_module_entry_table(_patch_mod_entries); 1045 } 1046 1047 // [jimage | exploded modules build] 1048 if (has_jrt_entry()) { 1049 // Print the location of the java runtime image 1050 tty->print("%s ;", _jrt_entry->name()); 1051 } else { 1052 // Print exploded module build path specifications 1053 if (_exploded_entries != NULL) { 1054 print_module_entry_table(_exploded_entries); 1055 } 1056 } 1057 1058 // appended entries 1059 e = _first_append_entry; 1060 while (e != NULL) { 1061 tty->print("%s ;", e->name()); 1062 e = e->next(); 1063 } 1064 tty->print_cr("]"); 1065 } 1066 1067 void ClassLoader::load_zip_library() { 1068 assert(ZipOpen == NULL, "should not load zip library twice"); 1069 // First make sure native library is loaded 1070 os::native_java_library(); 1071 // Load zip library 1072 char path[JVM_MAXPATHLEN]; 1073 char ebuf[1024]; 1074 void* handle = NULL; 1075 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) { 1076 handle = os::dll_load(path, ebuf, sizeof ebuf); 1077 } 1078 if (handle == NULL) { 1079 vm_exit_during_initialization("Unable to load ZIP library", path); 1080 } 1081 // Lookup zip entry points 1082 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open")); 1083 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close")); 1084 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry")); 1085 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry")); 1086 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry")); 1087 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully")); 1088 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32")); 1089 1090 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL 1091 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL || 1092 GetNextEntry == NULL || Crc32 == NULL) { 1093 vm_exit_during_initialization("Corrupted ZIP library", path); 1094 } 1095 1096 if (ZipInflateFully == NULL) { 1097 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path); 1098 } 1099 1100 // Lookup canonicalize entry in libjava.dll 1101 void *javalib_handle = os::native_java_library(); 1102 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize")); 1103 // This lookup only works on 1.3. Do not check for non-null here 1104 } 1105 1106 void ClassLoader::load_jimage_library() { 1107 // First make sure native library is loaded 1108 os::native_java_library(); 1109 // Load jimage library 1110 char path[JVM_MAXPATHLEN]; 1111 char ebuf[1024]; 1112 void* handle = NULL; 1113 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) { 1114 handle = os::dll_load(path, ebuf, sizeof ebuf); 1115 } 1116 if (handle == NULL) { 1117 vm_exit_during_initialization("Unable to load jimage library", path); 1118 } 1119 1120 // Lookup jimage entry points 1121 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open")); 1122 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found"); 1123 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close")); 1124 guarantee(JImageClose != NULL, "function JIMAGE_Close not found"); 1125 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule")); 1126 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found"); 1127 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource")); 1128 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found"); 1129 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource")); 1130 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found"); 1131 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator")); 1132 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found"); 1133 JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath")); 1134 guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found"); 1135 } 1136 1137 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) { 1138 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg); 1139 } 1140 1141 int ClassLoader::crc32(int crc, const char* buf, int len) { 1142 assert(Crc32 != NULL, "ZIP_CRC32 is not found"); 1143 return (*Crc32)(crc, (const jbyte*)buf, len); 1144 } 1145 1146 // Function add_package extracts the package from the fully qualified class name 1147 // and checks if the package is in the boot loader's package entry table. If so, 1148 // then it sets the classpath_index in the package entry record. 1149 // 1150 // The classpath_index field is used to find the entry on the boot loader class 1151 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a 1152 // in an unnamed module. It is also used to indicate (for all packages whose 1153 // classes are loaded by the boot loader) that at least one of the package's 1154 // classes has been loaded. 1155 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) { 1156 assert(fullq_class_name != NULL, "just checking"); 1157 1158 // Get package name from fully qualified class name. 1159 ResourceMark rm; 1160 const char *cp = package_from_name(fullq_class_name); 1161 if (cp != NULL) { 1162 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages(); 1163 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false); 1164 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol); 1165 if (pkg_entry != NULL) { 1166 assert(classpath_index != -1, "Unexpected classpath_index"); 1167 pkg_entry->set_classpath_index(classpath_index); 1168 } else { 1169 return false; 1170 } 1171 } 1172 return true; 1173 } 1174 1175 oop ClassLoader::get_system_package(const char* name, TRAPS) { 1176 // Look up the name in the boot loader's package entry table. 1177 if (name != NULL) { 1178 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL); 1179 // Look for the package entry in the boot loader's package entry table. 1180 PackageEntry* package = 1181 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym); 1182 1183 // Return NULL if package does not exist or if no classes in that package 1184 // have been loaded. 1185 if (package != NULL && package->has_loaded_class()) { 1186 ModuleEntry* module = package->module(); 1187 if (module->location() != NULL) { 1188 ResourceMark rm(THREAD); 1189 Handle ml = java_lang_String::create_from_str( 1190 module->location()->as_C_string(), THREAD); 1191 return ml(); 1192 } 1193 // Return entry on boot loader class path. 1194 Handle cph = java_lang_String::create_from_str( 1195 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD); 1196 return cph(); 1197 } 1198 } 1199 return NULL; 1200 } 1201 1202 objArrayOop ClassLoader::get_system_packages(TRAPS) { 1203 ResourceMark rm(THREAD); 1204 // List of pointers to PackageEntrys that have loaded classes. 1205 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50); 1206 { 1207 MutexLocker ml(Module_lock, THREAD); 1208 1209 PackageEntryTable* pe_table = 1210 ClassLoaderData::the_null_class_loader_data()->packages(); 1211 1212 // Collect the packages that have at least one loaded class. 1213 for (int x = 0; x < pe_table->table_size(); x++) { 1214 for (PackageEntry* package_entry = pe_table->bucket(x); 1215 package_entry != NULL; 1216 package_entry = package_entry->next()) { 1217 if (package_entry->has_loaded_class()) { 1218 loaded_class_pkgs->append(package_entry); 1219 } 1220 } 1221 } 1222 } 1223 1224 1225 // Allocate objArray and fill with java.lang.String 1226 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), 1227 loaded_class_pkgs->length(), CHECK_NULL); 1228 objArrayHandle result(THREAD, r); 1229 for (int x = 0; x < loaded_class_pkgs->length(); x++) { 1230 PackageEntry* package_entry = loaded_class_pkgs->at(x); 1231 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL); 1232 result->obj_at_put(x, str()); 1233 } 1234 return result(); 1235 } 1236 1237 // caller needs ResourceMark 1238 const char* ClassLoader::file_name_for_class_name(const char* class_name, 1239 int class_name_len) { 1240 assert(class_name != NULL, "invariant"); 1241 assert((int)strlen(class_name) == class_name_len, "invariant"); 1242 1243 static const char class_suffix[] = ".class"; 1244 1245 char* const file_name = NEW_RESOURCE_ARRAY(char, 1246 class_name_len + 1247 sizeof(class_suffix)); // includes term NULL 1248 1249 strncpy(file_name, class_name, class_name_len); 1250 strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix)); 1251 1252 return file_name; 1253 } 1254 1255 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry, 1256 const GrowableArray<ModuleClassPathList*>* const module_list) { 1257 int num_of_entries = module_list->length(); 1258 const Symbol* class_module_name = mod_entry->name(); 1259 1260 // Loop through all the modules in either the patch-module or exploded entries looking for module 1261 for (int i = 0; i < num_of_entries; i++) { 1262 ModuleClassPathList* module_cpl = module_list->at(i); 1263 Symbol* module_cpl_name = module_cpl->module_name(); 1264 1265 if (module_cpl_name->fast_compare(class_module_name) == 0) { 1266 // Class' module has been located. 1267 return module_cpl->module_first_entry(); 1268 } 1269 } 1270 return NULL; 1271 } 1272 1273 1274 // Search either the patch-module or exploded build entries for class. 1275 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list, 1276 const char* const class_name, 1277 const char* const file_name, 1278 TRAPS) { 1279 ClassFileStream* stream = NULL; 1280 1281 // Find the class' defining module in the boot loader's module entry table 1282 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL); 1283 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL; 1284 1285 // If the module system has not defined java.base yet, then 1286 // classes loaded are assumed to be defined to java.base. 1287 // When java.base is eventually defined by the module system, 1288 // all packages of classes that have been previously loaded 1289 // are verified in ModuleEntryTable::verify_javabase_packages(). 1290 if (!Universe::is_module_initialized() && 1291 !ModuleEntryTable::javabase_defined() && 1292 mod_entry == NULL) { 1293 mod_entry = ModuleEntryTable::javabase_moduleEntry(); 1294 } 1295 1296 // The module must be a named module 1297 ClassPathEntry* e = NULL; 1298 if (mod_entry != NULL && mod_entry->is_named()) { 1299 if (module_list == _exploded_entries) { 1300 // The exploded build entries can be added to at any time so a lock is 1301 // needed when searching them. 1302 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build"); 1303 MutexLocker ml(Module_lock, THREAD); 1304 e = find_first_module_cpe(mod_entry, module_list); 1305 } else { 1306 e = find_first_module_cpe(mod_entry, module_list); 1307 } 1308 } 1309 1310 // Try to load the class from the module's ClassPathEntry list. 1311 while (e != NULL) { 1312 stream = e->open_stream(file_name, CHECK_NULL); 1313 // No context.check is required since CDS is not supported 1314 // for an exploded modules build or if --patch-module is specified. 1315 if (NULL != stream) { 1316 return stream; 1317 } 1318 e = e->next(); 1319 } 1320 // If the module was located, break out even if the class was not 1321 // located successfully from that module's ClassPathEntry list. 1322 // There will not be another valid entry for that module. 1323 return NULL; 1324 } 1325 1326 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) { 1327 assert(name != NULL, "invariant"); 1328 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 1329 1330 ResourceMark rm(THREAD); 1331 HandleMark hm(THREAD); 1332 1333 const char* const class_name = name->as_C_string(); 1334 1335 EventMark m("loading class %s", class_name); 1336 1337 const char* const file_name = file_name_for_class_name(class_name, 1338 name->utf8_length()); 1339 assert(file_name != NULL, "invariant"); 1340 1341 ClassLoaderExt::Context context(class_name, file_name, THREAD); 1342 1343 // Lookup stream for parsing .class file 1344 ClassFileStream* stream = NULL; 1345 s2 classpath_index = 0; 1346 ClassPathEntry* e = NULL; 1347 1348 // If DumpSharedSpaces is true boot loader visibility boundaries are set to: 1349 // - [jimage] + [_first_append_entry to _last_append_entry] (all path entries). 1350 // 1351 // If search_append_only is true, boot loader visibility boundaries are 1352 // set to be _first_append_entry to the end. This includes: 1353 // [-Xbootclasspath/a]; [jvmti appended entries] 1354 // 1355 // If both DumpSharedSpaces and search_append_only are false, boot loader 1356 // visibility boundaries are set to be the --patch-module entries plus the base piece. 1357 // This would include: 1358 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build] 1359 // 1360 1361 // Load Attempt #1: --patch-module 1362 // Determine the class' defining module. If it appears in the _patch_mod_entries, 1363 // attempt to load the class from those locations specific to the module. 1364 // Specifications to --patch-module can contain a partial number of classes 1365 // that are part of the overall module definition. So if a particular class is not 1366 // found within its module specification, the search should continue to Load Attempt #2. 1367 // Note: The --patch-module entries are never searched if the boot loader's 1368 // visibility boundary is limited to only searching the append entries. 1369 if (_patch_mod_entries != NULL && !search_append_only) { 1370 // At CDS dump time, the --patch-module entries are ignored. That means a 1371 // class is still loaded from the runtime image even if it might 1372 // appear in the _patch_mod_entries. The runtime shared class visibility 1373 // check will determine if a shared class is visible based on the runtime 1374 // environemnt, including the runtime --patch-module setting. 1375 if (!DumpSharedSpaces) { 1376 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL); 1377 } 1378 } 1379 1380 // Load Attempt #2: [jimage | exploded build] 1381 if (!search_append_only && (NULL == stream)) { 1382 if (has_jrt_entry()) { 1383 e = _jrt_entry; 1384 stream = _jrt_entry->open_stream(file_name, CHECK_NULL); 1385 if (!context.check(stream, classpath_index)) { 1386 return NULL; 1387 } 1388 } else { 1389 // Exploded build - attempt to locate class in its defining module's location. 1390 assert(_exploded_entries != NULL, "No exploded build entries present"); 1391 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL); 1392 } 1393 } 1394 1395 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries] 1396 if ((search_append_only || DumpSharedSpaces) && (NULL == stream)) { 1397 // For the boot loader append path search, the starting classpath_index 1398 // for the appended piece is always 1 to account for either the 1399 // _jrt_entry or the _exploded_entries. 1400 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly"); 1401 classpath_index = 1; 1402 1403 e = _first_append_entry; 1404 while (e != NULL) { 1405 if (DumpSharedSpaces && classpath_index >= _num_boot_entries) { 1406 // Do not load any class from the app classpath using the boot loader. Let 1407 // the built-in app class laoder load them. 1408 break; 1409 } 1410 stream = e->open_stream(file_name, CHECK_NULL); 1411 if (!context.check(stream, classpath_index)) { 1412 return NULL; 1413 } 1414 if (NULL != stream) { 1415 break; 1416 } 1417 e = e->next(); 1418 ++classpath_index; 1419 } 1420 } 1421 1422 if (NULL == stream) { 1423 return NULL; 1424 } 1425 1426 stream->set_verify(context.should_verify(classpath_index)); 1427 1428 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 1429 Handle protection_domain; 1430 1431 InstanceKlass* result = KlassFactory::create_from_stream(stream, 1432 name, 1433 loader_data, 1434 protection_domain, 1435 NULL, // host_klass 1436 NULL, // cp_patches 1437 THREAD); 1438 if (HAS_PENDING_EXCEPTION) { 1439 if (DumpSharedSpaces) { 1440 tty->print_cr("Preload Error: Failed to load %s", class_name); 1441 } 1442 return NULL; 1443 } 1444 1445 return context.record_result(name, e, classpath_index, result, THREAD); 1446 } 1447 1448 #if INCLUDE_CDS 1449 static char* skip_uri_protocol(char* source) { 1450 if (strncmp(source, "file:", 5) == 0) { 1451 // file: protocol path could start with file:/ or file:/// 1452 // locate the char after all the forward slashes 1453 int offset = 5; 1454 while (*(source + offset) == '/') { 1455 offset++; 1456 } 1457 source += offset; 1458 // for non-windows platforms, move back one char as the path begins with a '/' 1459 #ifndef _WINDOWS 1460 source -= 1; 1461 #endif 1462 } else if (strncmp(source, "jrt:/", 5) == 0) { 1463 source += 5; 1464 } 1465 return source; 1466 } 1467 1468 void ClassLoader::record_shared_class_loader_type(InstanceKlass* ik, const ClassFileStream* stream) { 1469 assert(DumpSharedSpaces, "sanity"); 1470 assert(stream != NULL, "sanity"); 1471 1472 if (ik->is_anonymous()) { 1473 // We do not archive anonymous classes. 1474 return; 1475 } 1476 1477 if (stream->source() == NULL) { 1478 if (ik->class_loader() == NULL) { 1479 // JFR classes 1480 ik->set_shared_classpath_index(0); 1481 ik->set_class_loader_type(ClassLoader::BOOT_LOADER); 1482 } 1483 return; 1484 } 1485 1486 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build"); 1487 1488 ModuleEntry* module = ik->module(); 1489 ClassPathEntry* e = NULL; 1490 int classpath_index = 0; 1491 1492 // Check if the class is from the runtime image 1493 if (module != NULL && (module->location() != NULL) && 1494 (module->location()->starts_with("jrt:"))) { 1495 e = _jrt_entry; 1496 classpath_index = 0; 1497 } else { 1498 classpath_index = 1; 1499 ResourceMark rm; 1500 char* canonical_path = NEW_RESOURCE_ARRAY(char, JVM_MAXPATHLEN); 1501 for (e = _first_append_entry; e != NULL; e = e->next()) { 1502 if (get_canonical_path(e->name(), canonical_path, JVM_MAXPATHLEN)) { 1503 char* src = (char*)stream->source(); 1504 // save the path from the file: protocol or the module name from the jrt: protocol 1505 // if no protocol prefix is found, src is the same as stream->source() after the following call 1506 src = skip_uri_protocol(src); 1507 if (strcmp(canonical_path, os::native_path((char*)src)) == 0) { 1508 break; 1509 } 1510 classpath_index ++; 1511 } 1512 } 1513 if (e == NULL) { 1514 assert(ik->shared_classpath_index() < 0, 1515 "must be a class from a custom jar which isn't in the class path or boot class path"); 1516 return; 1517 } 1518 } 1519 1520 if (classpath_index < _num_boot_entries) { 1521 // ik is either: 1522 // 1) a boot class loaded from the runtime image during vm initialization (classpath_index = 0); or 1523 // 2) a user's class from -Xbootclasspath/a (classpath_index > 0) 1524 // In the second case, the classpath_index, classloader_type will be recorded via 1525 // context.record_result() in ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS). 1526 if (classpath_index > 0) { 1527 return; 1528 } 1529 } 1530 1531 ResourceMark rm; 1532 const char* const class_name = ik->name()->as_C_string(); 1533 const char* const file_name = file_name_for_class_name(class_name, 1534 ik->name()->utf8_length()); 1535 assert(file_name != NULL, "invariant"); 1536 Thread* THREAD = Thread::current(); 1537 ClassLoaderExt::Context context(class_name, file_name, CATCH); 1538 context.record_result(ik->name(), e, classpath_index, ik, THREAD); 1539 } 1540 #endif // INCLUDE_CDS 1541 1542 // Initialize the class loader's access to methods in libzip. Parse and 1543 // process the boot classpath into a list ClassPathEntry objects. Once 1544 // this list has been created, it must not change order (see class PackageInfo) 1545 // it can be appended to and is by jvmti and the kernel vm. 1546 1547 void ClassLoader::initialize() { 1548 EXCEPTION_MARK; 1549 1550 if (UsePerfData) { 1551 // jvmstat performance counters 1552 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time"); 1553 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime"); 1554 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self"); 1555 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime"); 1556 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self"); 1557 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime"); 1558 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self"); 1559 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses"); 1560 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses"); 1561 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses"); 1562 1563 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime"); 1564 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self"); 1565 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime"); 1566 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime"); 1567 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime"); 1568 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime"); 1569 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self"); 1570 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount"); 1571 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses"); 1572 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime"); 1573 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self"); 1574 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes"); 1575 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes"); 1576 1577 1578 // The following performance counters are added for measuring the impact 1579 // of the bug fix of 6365597. They are mainly focused on finding out 1580 // the behavior of system & user-defined classloader lock, whether 1581 // ClassLoader.loadClass/findClass is being called synchronized or not. 1582 // Also two additional counters are created to see whether 'UnsyncloadClass' 1583 // flag is being set or not and how many times load_instance_class call 1584 // fails with linkageError etc. 1585 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS, 1586 "systemLoaderLockContentionRate"); 1587 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS, 1588 "nonSystemLoaderLockContentionRate"); 1589 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS, 1590 "jvmFindLoadedClassNoLockCalls"); 1591 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS, 1592 "jvmDefineClassNoLockCalls"); 1593 1594 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS, 1595 "jniDefineClassNoLockCalls"); 1596 1597 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, 1598 "unsafeDefineClassCalls"); 1599 1600 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet"); 1601 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS, 1602 "loadInstanceClassFailRate"); 1603 1604 // increment the isUnsyncloadClass counter if UnsyncloadClass is set. 1605 if (UnsyncloadClass) { 1606 _isUnsyncloadClass->inc(); 1607 } 1608 } 1609 1610 // lookup zip library entry points 1611 load_zip_library(); 1612 // lookup jimage library entry points 1613 load_jimage_library(); 1614 #if INCLUDE_CDS 1615 // initialize search path 1616 if (DumpSharedSpaces) { 1617 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info(); 1618 } 1619 #endif 1620 setup_bootstrap_search_path(); 1621 } 1622 1623 #if INCLUDE_CDS 1624 void ClassLoader::initialize_shared_path() { 1625 if (DumpSharedSpaces) { 1626 _num_boot_entries = _num_entries; 1627 ClassLoaderExt::setup_search_paths(); 1628 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check() 1629 } 1630 } 1631 #endif 1632 1633 jlong ClassLoader::classloader_time_ms() { 1634 return UsePerfData ? 1635 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1; 1636 } 1637 1638 jlong ClassLoader::class_init_count() { 1639 return UsePerfData ? _perf_classes_inited->get_value() : -1; 1640 } 1641 1642 jlong ClassLoader::class_init_time_ms() { 1643 return UsePerfData ? 1644 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1; 1645 } 1646 1647 jlong ClassLoader::class_verify_time_ms() { 1648 return UsePerfData ? 1649 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1; 1650 } 1651 1652 jlong ClassLoader::class_link_count() { 1653 return UsePerfData ? _perf_classes_linked->get_value() : -1; 1654 } 1655 1656 jlong ClassLoader::class_link_time_ms() { 1657 return UsePerfData ? 1658 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1; 1659 } 1660 1661 int ClassLoader::compute_Object_vtable() { 1662 // hardwired for JDK1.2 -- would need to duplicate class file parsing 1663 // code to determine actual value from file 1664 // Would be value '11' if finals were in vtable 1665 int JDK_1_2_Object_vtable_size = 5; 1666 return JDK_1_2_Object_vtable_size * vtableEntry::size(); 1667 } 1668 1669 1670 void classLoader_init1() { 1671 ClassLoader::initialize(); 1672 } 1673 1674 // Complete the ClassPathEntry setup for the boot loader 1675 void ClassLoader::classLoader_init2(TRAPS) { 1676 // Setup the list of module/path pairs for --patch-module processing 1677 // This must be done after the SymbolTable is created in order 1678 // to use fast_compare on module names instead of a string compare. 1679 if (Arguments::get_patch_mod_prefix() != NULL) { 1680 setup_patch_mod_entries(); 1681 } 1682 1683 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries 1684 // to successfully determine if java.base has been patched) 1685 create_javabase(); 1686 1687 // Setup the initial java.base/path pair for the exploded build entries. 1688 // As more modules are defined during module system initialization, more 1689 // entries will be added to the exploded build array. 1690 if (!has_jrt_entry()) { 1691 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds"); 1692 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds"); 1693 // Set up the boot loader's _exploded_entries list. Note that this gets 1694 // done before loading any classes, by the same thread that will 1695 // subsequently do the first class load. So, no lock is needed for this. 1696 assert(_exploded_entries == NULL, "Should only get initialized once"); 1697 _exploded_entries = new (ResourceObj::C_HEAP, mtModule) 1698 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true); 1699 add_to_exploded_build_list(vmSymbols::java_base(), CHECK); 1700 } 1701 } 1702 1703 1704 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) { 1705 assert(orig != NULL && out != NULL && len > 0, "bad arguments"); 1706 if (CanonicalizeEntry != NULL) { 1707 JavaThread* THREAD = JavaThread::current(); 1708 JNIEnv* env = THREAD->jni_environment(); 1709 ResourceMark rm(THREAD); 1710 1711 // os::native_path writes into orig_copy 1712 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1); 1713 strcpy(orig_copy, orig); 1714 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) { 1715 return false; 1716 } 1717 } else { 1718 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing 1719 strncpy(out, orig, len); 1720 out[len - 1] = '\0'; 1721 } 1722 return true; 1723 } 1724 1725 void ClassLoader::create_javabase() { 1726 Thread* THREAD = Thread::current(); 1727 1728 // Create java.base's module entry for the boot 1729 // class loader prior to loading j.l.Ojbect. 1730 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 1731 1732 // Get module entry table 1733 ModuleEntryTable* null_cld_modules = null_cld->modules(); 1734 if (null_cld_modules == NULL) { 1735 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader"); 1736 } 1737 1738 { 1739 MutexLocker ml(Module_lock, THREAD); 1740 ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(), 1741 false, vmSymbols::java_base(), NULL, NULL, null_cld); 1742 if (jb_module == NULL) { 1743 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME); 1744 } 1745 ModuleEntryTable::set_javabase_moduleEntry(jb_module); 1746 } 1747 } 1748 1749 #ifndef PRODUCT 1750 1751 // CompileTheWorld 1752 // 1753 // Iterates over all class path entries and forces compilation of all methods 1754 // in all classes found. Currently, only zip/jar archives are searched. 1755 // 1756 // The classes are loaded by the Java level bootstrap class loader, and the 1757 // initializer is called. If DelayCompilationDuringStartup is true (default), 1758 // the interpreter will run the initialization code. Note that forcing 1759 // initialization in this way could potentially lead to initialization order 1760 // problems, in which case we could just force the initialization bit to be set. 1761 1762 1763 // We need to iterate over the contents of a zip/jar file, so we replicate the 1764 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile, 1765 // since jzfile already has a void* definition. 1766 // 1767 // Note that this is only used in debug mode. 1768 // 1769 // HotSpot integration note: 1770 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build 1771 1772 1773 // JDK 1.3 version 1774 typedef struct real_jzentry { /* Zip file entry */ 1775 char *name; /* entry name */ 1776 jint time; /* modification time */ 1777 jint size; /* size of uncompressed data */ 1778 jint csize; /* size of compressed data (zero if uncompressed) */ 1779 jint crc; /* crc of uncompressed data */ 1780 char *comment; /* optional zip file comment */ 1781 jbyte *extra; /* optional extra data */ 1782 jint pos; /* position of LOC header (if negative) or data */ 1783 } real_jzentry; 1784 1785 typedef struct real_jzfile { /* Zip file */ 1786 char *name; /* zip file name */ 1787 jint refs; /* number of active references */ 1788 jint fd; /* open file descriptor */ 1789 void *lock; /* read lock */ 1790 char *comment; /* zip file comment */ 1791 char *msg; /* zip error message */ 1792 void *entries; /* array of hash cells */ 1793 jint total; /* total number of entries */ 1794 unsigned short *table; /* Hash chain heads: indexes into entries */ 1795 jint tablelen; /* number of hash eads */ 1796 real_jzfile *next; /* next zip file in search list */ 1797 jzentry *cache; /* we cache the most recently freed jzentry */ 1798 /* Information on metadata names in META-INF directory */ 1799 char **metanames; /* array of meta names (may have null names) */ 1800 jint metacount; /* number of slots in metanames array */ 1801 /* If there are any per-entry comments, they are in the comments array */ 1802 char **comments; 1803 } real_jzfile; 1804 1805 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) { 1806 // For now we only compile all methods in all classes in zip/jar files 1807 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir); 1808 tty->cr(); 1809 } 1810 1811 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) { 1812 real_jzfile* zip = (real_jzfile*) _zip; 1813 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name); 1814 tty->cr(); 1815 // Iterate over all entries in zip file 1816 for (int n = 0; ; n++) { 1817 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n)); 1818 if (ze == NULL) break; 1819 ClassLoader::compile_the_world_in(ze->name, loader, CHECK); 1820 } 1821 if (HAS_PENDING_EXCEPTION) { 1822 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1823 CLEAR_PENDING_EXCEPTION; 1824 tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); 1825 tty->print_cr("Increase class metadata storage if a limit was set"); 1826 } else { 1827 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); 1828 } 1829 } 1830 } 1831 1832 void ClassLoader::compile_the_world() { 1833 EXCEPTION_MARK; 1834 HandleMark hm(THREAD); 1835 ResourceMark rm(THREAD); 1836 1837 assert(has_jrt_entry(), "Compile The World not supported with exploded module build"); 1838 1839 // Find bootstrap loader 1840 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader()); 1841 jlong start = os::javaTimeMillis(); 1842 1843 // Compile the world for the modular java runtime image 1844 _jrt_entry->compile_the_world(system_class_loader, CATCH); 1845 1846 // Iterate over all bootstrap class path appended entries 1847 ClassPathEntry* e = _first_append_entry; 1848 while (e != NULL) { 1849 assert(!e->is_modules_image(), "A modular java runtime image is present on the list of appended entries"); 1850 e->compile_the_world(system_class_loader, CATCH); 1851 e = e->next(); 1852 } 1853 jlong end = os::javaTimeMillis(); 1854 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)", 1855 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start)); 1856 { 1857 // Print statistics as if before normal exit: 1858 extern void print_statistics(); 1859 print_statistics(); 1860 } 1861 vm_exit(0); 1862 } 1863 1864 int ClassLoader::_compile_the_world_class_counter = 0; 1865 int ClassLoader::_compile_the_world_method_counter = 0; 1866 static int _codecache_sweep_counter = 0; 1867 1868 // Filter out all exceptions except OOMs 1869 static void clear_pending_exception_if_not_oom(TRAPS) { 1870 if (HAS_PENDING_EXCEPTION && 1871 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1872 CLEAR_PENDING_EXCEPTION; 1873 } 1874 // The CHECK at the caller will propagate the exception out 1875 } 1876 1877 /** 1878 * Returns if the given method should be compiled when doing compile-the-world. 1879 * 1880 * TODO: This should be a private method in a CompileTheWorld class. 1881 */ 1882 static bool can_be_compiled(const methodHandle& m, int comp_level) { 1883 assert(CompileTheWorld, "must be"); 1884 1885 // It's not valid to compile a native wrapper for MethodHandle methods 1886 // that take a MemberName appendix since the bytecode signature is not 1887 // correct. 1888 vmIntrinsics::ID iid = m->intrinsic_id(); 1889 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) { 1890 return false; 1891 } 1892 1893 return CompilationPolicy::can_be_compiled(m, comp_level); 1894 } 1895 1896 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) { 1897 if (string_ends_with(name, ".class")) { 1898 // We have a .class file 1899 int len = (int)strlen(name); 1900 char buffer[2048]; 1901 strncpy(buffer, name, len - 6); 1902 buffer[len-6] = 0; 1903 // If the file has a period after removing .class, it's not really a 1904 // valid class file. The class loader will check everything else. 1905 if (strchr(buffer, '.') == NULL) { 1906 _compile_the_world_class_counter++; 1907 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return; 1908 1909 // Construct name without extension 1910 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK); 1911 // Use loader to load and initialize class 1912 Klass* k = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD); 1913 if (k != NULL && !HAS_PENDING_EXCEPTION) { 1914 k->initialize(THREAD); 1915 } 1916 bool exception_occurred = HAS_PENDING_EXCEPTION; 1917 clear_pending_exception_if_not_oom(CHECK); 1918 if (CompileTheWorldPreloadClasses && k != NULL) { 1919 InstanceKlass* ik = InstanceKlass::cast(k); 1920 ConstantPool::preload_and_initialize_all_classes(ik->constants(), THREAD); 1921 if (HAS_PENDING_EXCEPTION) { 1922 // If something went wrong in preloading we just ignore it 1923 clear_pending_exception_if_not_oom(CHECK); 1924 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer); 1925 } 1926 } 1927 1928 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) { 1929 if (k == NULL || exception_occurred) { 1930 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class 1931 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer); 1932 } else { 1933 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer); 1934 // Preload all classes to get around uncommon traps 1935 // Iterate over all methods in class 1936 int comp_level = CompilationPolicy::policy()->initial_compile_level(); 1937 InstanceKlass* ik = InstanceKlass::cast(k); 1938 for (int n = 0; n < ik->methods()->length(); n++) { 1939 methodHandle m (THREAD, ik->methods()->at(n)); 1940 if (can_be_compiled(m, comp_level)) { 1941 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) { 1942 // Give sweeper a chance to keep up with CTW 1943 VM_CTWThreshold op; 1944 VMThread::execute(&op); 1945 _codecache_sweep_counter = 0; 1946 } 1947 // Force compilation 1948 CompileBroker::compile_method(m, InvocationEntryBci, comp_level, 1949 methodHandle(), 0, CompileTask::Reason_CTW, THREAD); 1950 if (HAS_PENDING_EXCEPTION) { 1951 clear_pending_exception_if_not_oom(CHECK); 1952 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1953 } else { 1954 _compile_the_world_method_counter++; 1955 } 1956 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) { 1957 // Clobber the first compile and force second tier compilation 1958 CompiledMethod* nm = m->code(); 1959 if (nm != NULL && !m->is_method_handle_intrinsic()) { 1960 // Throw out the code so that the code cache doesn't fill up 1961 nm->make_not_entrant(); 1962 } 1963 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization, 1964 methodHandle(), 0, CompileTask::Reason_CTW, THREAD); 1965 if (HAS_PENDING_EXCEPTION) { 1966 clear_pending_exception_if_not_oom(CHECK); 1967 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1968 } else { 1969 _compile_the_world_method_counter++; 1970 } 1971 } 1972 } else { 1973 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1974 } 1975 1976 CompiledMethod* nm = m->code(); 1977 if (nm != NULL && !m->is_method_handle_intrinsic()) { 1978 // Throw out the code so that the code cache doesn't fill up 1979 nm->make_not_entrant(); 1980 } 1981 } 1982 } 1983 } 1984 } 1985 } 1986 } 1987 1988 #endif //PRODUCT 1989 1990 // Please keep following two functions at end of this file. With them placed at top or in middle of the file, 1991 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589. 1992 void PerfClassTraceTime::initialize() { 1993 if (!UsePerfData) return; 1994 1995 if (_eventp != NULL) { 1996 // increment the event counter 1997 _eventp->inc(); 1998 } 1999 2000 // stop the current active thread-local timer to measure inclusive time 2001 _prev_active_event = -1; 2002 for (int i=0; i < EVENT_TYPE_COUNT; i++) { 2003 if (_timers[i].is_active()) { 2004 assert(_prev_active_event == -1, "should have only one active timer"); 2005 _prev_active_event = i; 2006 _timers[i].stop(); 2007 } 2008 } 2009 2010 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) { 2011 // start the inclusive timer if not recursively called 2012 _t.start(); 2013 } 2014 2015 // start thread-local timer of the given event type 2016 if (!_timers[_event_type].is_active()) { 2017 _timers[_event_type].start(); 2018 } 2019 } 2020 2021 PerfClassTraceTime::~PerfClassTraceTime() { 2022 if (!UsePerfData) return; 2023 2024 // stop the thread-local timer as the event completes 2025 // and resume the thread-local timer of the event next on the stack 2026 _timers[_event_type].stop(); 2027 jlong selftime = _timers[_event_type].ticks(); 2028 2029 if (_prev_active_event >= 0) { 2030 _timers[_prev_active_event].start(); 2031 } 2032 2033 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return; 2034 2035 // increment the counters only on the leaf call 2036 _t.stop(); 2037 _timep->inc(_t.ticks()); 2038 if (_selftimep != NULL) { 2039 _selftimep->inc(selftime); 2040 } 2041 // add all class loading related event selftime to the accumulated time counter 2042 ClassLoader::perf_accumulated_time()->inc(selftime); 2043 2044 // reset the timer 2045 _timers[_event_type].reset(); 2046 }