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 "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/log.hpp" 44#include "logging/logStream.hpp" 45#include "logging/logTag.hpp" 46#include "memory/allocation.inline.hpp" 47#include "memory/filemap.hpp" 48#include "memory/oopFactory.hpp" 49#include "memory/resourceArea.hpp" 50#include "memory/universe.inline.hpp" 51#include "oops/instanceKlass.hpp" 52#include "oops/instanceRefKlass.hpp" 53#include "oops/objArrayOop.inline.hpp" 54#include "oops/oop.inline.hpp" 55#include "oops/symbol.hpp" 56#include "prims/jvm.h" 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 82typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg); 83typedef void (JNICALL *ZipClose_t)(jzfile *zip); 84typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen); 85typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf); 86typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n); 87typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg); 88typedef jint (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len); 89 90static ZipOpen_t ZipOpen = NULL; 91static ZipClose_t ZipClose = NULL; 92static FindEntry_t FindEntry = NULL; 93static ReadEntry_t ReadEntry = NULL; 94static GetNextEntry_t GetNextEntry = NULL; 95static canonicalize_fn_t CanonicalizeEntry = NULL; 96static ZipInflateFully_t ZipInflateFully = NULL; 97static Crc32_t Crc32 = NULL; 98 99// Entry points for jimage.dll for loading jimage file entries 100 101static JImageOpen_t JImageOpen = NULL; 102static JImageClose_t JImageClose = NULL; 103static JImagePackageToModule_t JImagePackageToModule = NULL; 104static JImageFindResource_t JImageFindResource = NULL; 105static JImageGetResource_t JImageGetResource = NULL; 106static JImageResourceIterator_t JImageResourceIterator = NULL; 107static JImage_ResourcePath_t JImageResourcePath = NULL; 108 109// Globals 110 111PerfCounter* ClassLoader::_perf_accumulated_time = NULL; 112PerfCounter* ClassLoader::_perf_classes_inited = NULL; 113PerfCounter* ClassLoader::_perf_class_init_time = NULL; 114PerfCounter* ClassLoader::_perf_class_init_selftime = NULL; 115PerfCounter* ClassLoader::_perf_classes_verified = NULL; 116PerfCounter* ClassLoader::_perf_class_verify_time = NULL; 117PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL; 118PerfCounter* ClassLoader::_perf_classes_linked = NULL; 119PerfCounter* ClassLoader::_perf_class_link_time = NULL; 120PerfCounter* ClassLoader::_perf_class_link_selftime = NULL; 121PerfCounter* ClassLoader::_perf_class_parse_time = NULL; 122PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL; 123PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL; 124PerfCounter* ClassLoader::_perf_shared_classload_time = NULL; 125PerfCounter* ClassLoader::_perf_sys_classload_time = NULL; 126PerfCounter* ClassLoader::_perf_app_classload_time = NULL; 127PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL; 128PerfCounter* ClassLoader::_perf_app_classload_count = NULL; 129PerfCounter* ClassLoader::_perf_define_appclasses = NULL; 130PerfCounter* ClassLoader::_perf_define_appclass_time = NULL; 131PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL; 132PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL; 133PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL; 134PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL; 135PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL; 136PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL; 137PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL; 138PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL; 139PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL; 140PerfCounter* ClassLoader::_isUnsyncloadClass = NULL; 141PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL; 142 143GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL; 144GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL; 145ClassPathEntry* ClassLoader::_jrt_entry = NULL; 146ClassPathEntry* ClassLoader::_first_append_entry = NULL; 147ClassPathEntry* ClassLoader::_last_append_entry = NULL; 148int ClassLoader::_num_entries = 0; 149int ClassLoader::_num_boot_entries = -1; 150#if INCLUDE_CDS 151GrowableArray<char*>* ClassLoader::_boot_modules_array = NULL; 152GrowableArray<char*>* ClassLoader::_platform_modules_array = NULL; 153SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL; 154#endif 155 156// helper routines 157bool 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 166static 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 175bool 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. 186const 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. 245PackageEntry* 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 256ClassPathDirEntry::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 263ClassFileStream* 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 307ClassPathZipEntry::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 316ClassPathZipEntry::~ClassPathZipEntry() { 317 if (ZipClose != NULL) { 318 (*ZipClose)(_zip); 319 } 320 FREE_C_HEAP_ARRAY(char, _zip_name); 321} 322 323u1* 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 353u1* 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 409bool 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 429ClassFileStream* 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 449void 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 460ClassPathImageEntry::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 470ClassPathImageEntry::~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// 488ClassFileStream* 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 543JImageLocationRef 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 551bool 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 565void 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 581bool ClassPathImageEntry::is_jrt() { 582 return ClassLoader::is_jrt(name()); 583} 584 585#if INCLUDE_CDS 586void 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 593ModuleClassPathList::ModuleClassPathList(Symbol* module_name) { 594 _module_name = module_name; 595 _module_first_entry = NULL; 596 _module_last_entry = NULL; 597} 598 599ModuleClassPathList::~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 609void 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 620void 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 644void 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 661void 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 680int ClassLoader::get_shared_paths_misc_info_size() { 681 return _shared_paths_misc_info->get_used_bytes(); 682} 683 684void* ClassLoader::get_shared_paths_misc_info() { 685 return _shared_paths_misc_info->buffer(); 686} 687 688bool 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. 699void 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 754bool 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 767void 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_jrt(), "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 ClassLoader::initialize_module_loader_map(jimage); 806 } 807#endif 808 } 809 } else { 810 // If path does not exist, exit 811 vm_exit_during_initialization("Unable to establish the boot loader search path", path); 812 } 813 set_base_piece = false; 814 } else { 815 // Every entry on the system boot class path after the initial base piece, 816 // which is set by os::set_boot_path(), is considered an appended entry. 817 update_class_path_entry_list(path, false, bootstrap_search); 818 } 819 820#if INCLUDE_CDS 821 if (DumpSharedSpaces) { 822 check_shared_classpath(path); 823 } 824#endif 825 while (class_path[end] == os::path_separator()[0]) { 826 end++; 827 } 828 } 829} 830 831// During an exploded modules build, each module defined to the boot loader 832// will be added to the ClassLoader::_exploded_entries array. 833void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) { 834 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable"); 835 assert(_exploded_entries != NULL, "_exploded_entries was not initialized"); 836 837 // Find the module's symbol 838 ResourceMark rm(THREAD); 839 const char *module_name = module_sym->as_C_string(); 840 const char *home = Arguments::get_java_home(); 841 const char file_sep = os::file_separator()[0]; 842 // 10 represents the length of "modules" + 2 file separators + \0 843 size_t len = strlen(home) + strlen(module_name) + 10; 844 char *path = NEW_C_HEAP_ARRAY(char, len, mtModule); 845 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name); 846 847 struct stat st; 848 if (os::stat(path, &st) == 0) { 849 // Directory found 850 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK); 851 852 // If the path specification is valid, enter it into this module's list. 853 // There is no need to check for duplicate modules in the exploded entry list, 854 // since no two modules with the same name can be defined to the boot loader. 855 // This is checked at module definition time in Modules::define_module. 856 if (new_entry != NULL) { 857 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym); 858 module_cpl->add_to_list(new_entry); 859 { 860 MutexLocker ml(Module_lock, THREAD); 861 _exploded_entries->push(module_cpl); 862 } 863 log_info(class, load)("path: %s", path); 864 } 865 } 866 FREE_C_HEAP_ARRAY(char, path); 867} 868 869ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st, 870 bool throw_exception, 871 bool is_boot_append, TRAPS) { 872 JavaThread* thread = JavaThread::current(); 873 ClassPathEntry* new_entry = NULL; 874 if ((st->st_mode & S_IFMT) == S_IFREG) { 875 ResourceMark rm(thread); 876 // Regular file, should be a zip or jimage file 877 // Canonicalized filename 878 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN); 879 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 880 // This matches the classic VM 881 if (throw_exception) { 882 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL); 883 } else { 884 return NULL; 885 } 886 } 887 jint error; 888 JImageFile* jimage =(*JImageOpen)(canonical_path, &error); 889 if (jimage != NULL) { 890 new_entry = new ClassPathImageEntry(jimage, canonical_path); 891 } else { 892 char* error_msg = NULL; 893 jzfile* zip; 894 { 895 // enable call to C land 896 ThreadToNativeFromVM ttn(thread); 897 HandleMark hm(thread); 898 zip = (*ZipOpen)(canonical_path, &error_msg); 899 } 900 if (zip != NULL && error_msg == NULL) { 901 new_entry = new ClassPathZipEntry(zip, path, is_boot_append); 902 } else { 903 char *msg; 904 if (error_msg == NULL) { 905 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ; 906 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path); 907 } else { 908 int len = (int)(strlen(path) + strlen(error_msg) + 128); 909 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ; 910 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path); 911 } 912 // Don't complain about bad jar files added via -Xbootclasspath/a:. 913 if (throw_exception && is_init_completed()) { 914 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL); 915 } else { 916 return NULL; 917 } 918 } 919 } 920 log_info(class, path)("opened: %s", path); 921 log_info(class, load)("opened: %s", path); 922 } else { 923 // Directory 924 new_entry = new ClassPathDirEntry(path); 925 log_info(class, load)("path: %s", path); 926 } 927 return new_entry; 928} 929 930 931// Create a class path zip entry for a given path (return NULL if not found 932// or zip/JAR file cannot be opened) 933ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) { 934 // check for a regular file 935 struct stat st; 936 if (os::stat(path, &st) == 0) { 937 if ((st.st_mode & S_IFMT) == S_IFREG) { 938 char canonical_path[JVM_MAXPATHLEN]; 939 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 940 char* error_msg = NULL; 941 jzfile* zip; 942 { 943 // enable call to C land 944 JavaThread* thread = JavaThread::current(); 945 ThreadToNativeFromVM ttn(thread); 946 HandleMark hm(thread); 947 zip = (*ZipOpen)(canonical_path, &error_msg); 948 } 949 if (zip != NULL && error_msg == NULL) { 950 // create using canonical path 951 return new ClassPathZipEntry(zip, canonical_path, is_boot_append); 952 } 953 } 954 } 955 } 956 return NULL; 957} 958 959// returns true if entry already on class path 960bool ClassLoader::contains_append_entry(const char* name) { 961 ClassPathEntry* e = _first_append_entry; 962 while (e != NULL) { 963 // assume zip entries have been canonicalized 964 if (strcmp(name, e->name()) == 0) { 965 return true; 966 } 967 e = e->next(); 968 } 969 return false; 970} 971 972void ClassLoader::add_to_list(ClassPathEntry *new_entry) { 973 if (new_entry != NULL) { 974 if (_last_append_entry == NULL) { 975 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty"); 976 _first_append_entry = _last_append_entry = new_entry; 977 } else { 978 _last_append_entry->set_next(new_entry); 979 _last_append_entry = new_entry; 980 } 981 } 982 _num_entries++; 983} 984 985void ClassLoader::add_to_list(const char *apath) { 986 update_class_path_entry_list((char*)apath, false, false); 987} 988 989// Returns true IFF the file/dir exists and the entry was successfully created. 990bool ClassLoader::update_class_path_entry_list(const char *path, 991 bool check_for_duplicates, 992 bool is_boot_append, 993 bool throw_exception) { 994 struct stat st; 995 if (os::stat(path, &st) == 0) { 996 // File or directory found 997 ClassPathEntry* new_entry = NULL; 998 Thread* THREAD = Thread::current(); 999 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false)); 1000 if (new_entry == NULL) { 1001 return false; 1002 } 1003 1004 // Do not reorder the bootclasspath which would break get_system_package(). 1005 // Add new entry to linked list 1006 if (!check_for_duplicates || !contains_append_entry(new_entry->name())) { 1007 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry); 1008 } 1009 return true; 1010 } else { 1011#if INCLUDE_CDS 1012 if (DumpSharedSpaces) { 1013 _shared_paths_misc_info->add_nonexist_path(path); 1014 } 1015#endif 1016 return false; 1017 } 1018} 1019 1020static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) { 1021 ResourceMark rm; 1022 int num_of_entries = module_list->length(); 1023 for (int i = 0; i < num_of_entries; i++) { 1024 ClassPathEntry* e; 1025 ModuleClassPathList* mpl = module_list->at(i); 1026 tty->print("%s=", mpl->module_name()->as_C_string()); 1027 e = mpl->module_first_entry(); 1028 while (e != NULL) { 1029 tty->print("%s", e->name()); 1030 e = e->next(); 1031 if (e != NULL) { 1032 tty->print("%s", os::path_separator()); 1033 } 1034 } 1035 tty->print(" ;"); 1036 } 1037} 1038 1039void ClassLoader::print_bootclasspath() { 1040 ClassPathEntry* e; 1041 tty->print("[bootclasspath= "); 1042 1043 // Print --patch-module module/path specifications first 1044 if (_patch_mod_entries != NULL) { 1045 print_module_entry_table(_patch_mod_entries); 1046 } 1047 1048 // [jimage | exploded modules build] 1049 if (has_jrt_entry()) { 1050 // Print the location of the java runtime image 1051 tty->print("%s ;", _jrt_entry->name()); 1052 } else { 1053 // Print exploded module build path specifications 1054 if (_exploded_entries != NULL) { 1055 print_module_entry_table(_exploded_entries); 1056 } 1057 } 1058 1059 // appended entries 1060 e = _first_append_entry; 1061 while (e != NULL) { 1062 tty->print("%s ;", e->name()); 1063 e = e->next(); 1064 } 1065 tty->print_cr("]"); 1066} 1067 1068void ClassLoader::load_zip_library() { 1069 assert(ZipOpen == NULL, "should not load zip library twice"); 1070 // First make sure native library is loaded 1071 os::native_java_library(); 1072 // Load zip library 1073 char path[JVM_MAXPATHLEN]; 1074 char ebuf[1024]; 1075 void* handle = NULL; 1076 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) { 1077 handle = os::dll_load(path, ebuf, sizeof ebuf); 1078 } 1079 if (handle == NULL) { 1080 vm_exit_during_initialization("Unable to load ZIP library", path); 1081 } 1082 // Lookup zip entry points 1083 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open")); 1084 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close")); 1085 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry")); 1086 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry")); 1087 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry")); 1088 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully")); 1089 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32")); 1090 1091 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL 1092 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL || 1093 GetNextEntry == NULL || Crc32 == NULL) { 1094 vm_exit_during_initialization("Corrupted ZIP library", path); 1095 } 1096 1097 if (ZipInflateFully == NULL) { 1098 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path); 1099 } 1100 1101 // Lookup canonicalize entry in libjava.dll 1102 void *javalib_handle = os::native_java_library(); 1103 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize")); 1104 // This lookup only works on 1.3. Do not check for non-null here 1105} 1106 1107void ClassLoader::load_jimage_library() { 1108 // First make sure native library is loaded 1109 os::native_java_library(); 1110 // Load jimage library 1111 char path[JVM_MAXPATHLEN]; 1112 char ebuf[1024]; 1113 void* handle = NULL; 1114 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) { 1115 handle = os::dll_load(path, ebuf, sizeof ebuf); 1116 } 1117 if (handle == NULL) { 1118 vm_exit_during_initialization("Unable to load jimage library", path); 1119 } 1120 1121 // Lookup jimage entry points 1122 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open")); 1123 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found"); 1124 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close")); 1125 guarantee(JImageClose != NULL, "function JIMAGE_Close not found"); 1126 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule")); 1127 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found"); 1128 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource")); 1129 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found"); 1130 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource")); 1131 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found"); 1132 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator")); 1133 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found"); 1134 JImageResourcePath = CAST_TO_FN_PTR(JImage_ResourcePath_t, os::dll_lookup(handle, "JIMAGE_ResourcePath")); 1135 guarantee(JImageResourcePath != NULL, "function JIMAGE_ResourcePath not found"); 1136} 1137 1138jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) { 1139 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg); 1140} 1141 1142int ClassLoader::crc32(int crc, const char* buf, int len) { 1143 assert(Crc32 != NULL, "ZIP_CRC32 is not found"); 1144 return (*Crc32)(crc, (const jbyte*)buf, len); 1145} 1146 1147#if INCLUDE_CDS 1148void ClassLoader::initialize_module_loader_map(JImageFile* jimage) { 1149 if (!DumpSharedSpaces) { 1150 return; // only needed for CDS dump time 1151 } 1152 1153 ResourceMark rm; 1154 jlong size; 1155 JImageLocationRef location = (*JImageFindResource)(jimage, JAVA_BASE_NAME, get_jimage_version_string(), MODULE_LOADER_MAP, &size); 1156 if (location == 0) { 1157 vm_exit_during_initialization( 1158 "Cannot find ModuleLoaderMap location from modules jimage.", NULL); 1159 } 1160 char* buffer = NEW_RESOURCE_ARRAY(char, size + 1); 1161 buffer[size] = '\0'; 1162 jlong read = (*JImageGetResource)(jimage, location, buffer, size); 1163 if (read != size) { 1164 vm_exit_during_initialization( 1165 "Cannot find ModuleLoaderMap resource from modules jimage.", NULL); 1166 } 1167 char* char_buf = (char*)buffer; 1168 int buflen = (int)strlen(char_buf); 1169 char* begin_ptr = char_buf; 1170 char* end_ptr = strchr(begin_ptr, '\n'); 1171 bool process_boot_modules = false; 1172 _boot_modules_array = new (ResourceObj::C_HEAP, mtModule) 1173 GrowableArray<char*>(INITIAL_BOOT_MODULES_ARRAY_SIZE, true); 1174 _platform_modules_array = new (ResourceObj::C_HEAP, mtModule) 1175 GrowableArray<char*>(INITIAL_PLATFORM_MODULES_ARRAY_SIZE, true); 1176 while (end_ptr != NULL && (end_ptr - char_buf) < buflen) { 1177 // Allocate a buffer from the C heap to be appended to the _boot_modules_array 1178 // or the _platform_modules_array. 1179 char* temp_name = NEW_C_HEAP_ARRAY(char, (size_t)(end_ptr - begin_ptr + 1), mtInternal); 1180 strncpy(temp_name, begin_ptr, end_ptr - begin_ptr); 1181 temp_name[end_ptr - begin_ptr] = '\0'; 1182 if (strncmp(temp_name, "BOOT", 4) == 0) { 1183 process_boot_modules = true; 1184 FREE_C_HEAP_ARRAY(char, temp_name); 1185 } else if (strncmp(temp_name, "PLATFORM", 8) == 0) { 1186 process_boot_modules = false; 1187 FREE_C_HEAP_ARRAY(char, temp_name); 1188 } else { 1189 // module name 1190 if (process_boot_modules) { 1191 _boot_modules_array->append(temp_name); 1192 } else { 1193 _platform_modules_array->append(temp_name); 1194 } 1195 } 1196 begin_ptr = ++end_ptr; 1197 end_ptr = strchr(begin_ptr, '\n'); 1198 } 1199} 1200#endif 1201 1202// Function add_package extracts the package from the fully qualified class name 1203// and checks if the package is in the boot loader's package entry table. If so, 1204// then it sets the classpath_index in the package entry record. 1205// 1206// The classpath_index field is used to find the entry on the boot loader class 1207// path for packages with classes loaded by the boot loader from -Xbootclasspath/a 1208// in an unnamed module. It is also used to indicate (for all packages whose 1209// classes are loaded by the boot loader) that at least one of the package's 1210// classes has been loaded. 1211bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) { 1212 assert(fullq_class_name != NULL, "just checking"); 1213 1214 // Get package name from fully qualified class name. 1215 ResourceMark rm; 1216 const char *cp = package_from_name(fullq_class_name); 1217 if (cp != NULL) { 1218 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages(); 1219 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false); 1220 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol); 1221 if (pkg_entry != NULL) { 1222 assert(classpath_index != -1, "Unexpected classpath_index"); 1223 pkg_entry->set_classpath_index(classpath_index); 1224 } else { 1225 return false; 1226 } 1227 } 1228 return true; 1229} 1230 1231oop ClassLoader::get_system_package(const char* name, TRAPS) { 1232 // Look up the name in the boot loader's package entry table. 1233 if (name != NULL) { 1234 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL); 1235 // Look for the package entry in the boot loader's package entry table. 1236 PackageEntry* package = 1237 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym); 1238 1239 // Return NULL if package does not exist or if no classes in that package 1240 // have been loaded. 1241 if (package != NULL && package->has_loaded_class()) { 1242 ModuleEntry* module = package->module(); 1243 if (module->location() != NULL) { 1244 ResourceMark rm(THREAD); 1245 Handle ml = java_lang_String::create_from_str( 1246 module->location()->as_C_string(), THREAD); 1247 return ml(); 1248 } 1249 // Return entry on boot loader class path. 1250 Handle cph = java_lang_String::create_from_str( 1251 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD); 1252 return cph(); 1253 } 1254 } 1255 return NULL; 1256} 1257 1258objArrayOop ClassLoader::get_system_packages(TRAPS) { 1259 ResourceMark rm(THREAD); 1260 // List of pointers to PackageEntrys that have loaded classes. 1261 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50); 1262 { 1263 MutexLocker ml(Module_lock, THREAD); 1264 1265 PackageEntryTable* pe_table = 1266 ClassLoaderData::the_null_class_loader_data()->packages(); 1267 1268 // Collect the packages that have at least one loaded class. 1269 for (int x = 0; x < pe_table->table_size(); x++) { 1270 for (PackageEntry* package_entry = pe_table->bucket(x); 1271 package_entry != NULL; 1272 package_entry = package_entry->next()) { 1273 if (package_entry->has_loaded_class()) { 1274 loaded_class_pkgs->append(package_entry); 1275 } 1276 } 1277 } 1278 } 1279 1280 1281 // Allocate objArray and fill with java.lang.String 1282 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), 1283 loaded_class_pkgs->length(), CHECK_NULL); 1284 objArrayHandle result(THREAD, r); 1285 for (int x = 0; x < loaded_class_pkgs->length(); x++) { 1286 PackageEntry* package_entry = loaded_class_pkgs->at(x); 1287 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL); 1288 result->obj_at_put(x, str()); 1289 } 1290 return result(); 1291} 1292 1293#if INCLUDE_CDS 1294s2 ClassLoader::module_to_classloader(const char* module_name) { 1295 1296 assert(DumpSharedSpaces, "dump time only"); 1297 assert(_boot_modules_array != NULL, "_boot_modules_array is NULL"); 1298 assert(_platform_modules_array != NULL, "_platform_modules_array is NULL"); 1299 1300 int array_size = _boot_modules_array->length(); 1301 for (int i = 0; i < array_size; i++) { 1302 if (strcmp(module_name, _boot_modules_array->at(i)) == 0) { 1303 return BOOT_LOADER; 1304 } 1305 } 1306 1307 array_size = _platform_modules_array->length(); 1308 for (int i = 0; i < array_size; i++) { 1309 if (strcmp(module_name, _platform_modules_array->at(i)) == 0) { 1310 return PLATFORM_LOADER; 1311 } 1312 } 1313 1314 return APP_LOADER; 1315} 1316 1317s2 ClassLoader::classloader_type(Symbol* class_name, ClassPathEntry* e, int classpath_index, TRAPS) { 1318 assert(DumpSharedSpaces, "Only used for CDS dump time"); 1319 1320 // obtain the classloader type based on the class name. 1321 // First obtain the package name based on the class name. Then obtain 1322 // the classloader type based on the package name from the jimage using 1323 // a jimage API. If the classloader type cannot be found from the 1324 // jimage, it is determined by the class path entry. 1325 jshort loader_type = ClassLoader::APP_LOADER; 1326 if (e->is_jrt()) { 1327 ResourceMark rm; 1328 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK_0); 1329 if (pkg_name != NULL) { 1330 const char* pkg_name_C_string = (const char*)(pkg_name->as_C_string()); 1331 ClassPathImageEntry* cpie = (ClassPathImageEntry*)e; 1332 JImageFile* jimage = cpie->jimage(); 1333 char* module_name = (char*)(*JImagePackageToModule)(jimage, pkg_name_C_string); 1334 if (module_name != NULL) { 1335 loader_type = ClassLoader::module_to_classloader(module_name); 1336 } 1337 } 1338 } else if (ClassLoaderExt::is_boot_classpath(classpath_index)) { 1339 loader_type = ClassLoader::BOOT_LOADER; 1340 } 1341 return loader_type; 1342} 1343#endif 1344 1345// caller needs ResourceMark 1346const char* ClassLoader::file_name_for_class_name(const char* class_name, 1347 int class_name_len) { 1348 assert(class_name != NULL, "invariant"); 1349 assert((int)strlen(class_name) == class_name_len, "invariant"); 1350 1351 static const char class_suffix[] = ".class"; 1352 1353 char* const file_name = NEW_RESOURCE_ARRAY(char, 1354 class_name_len + 1355 sizeof(class_suffix)); // includes term NULL 1356 1357 strncpy(file_name, class_name, class_name_len); 1358 strncpy(&file_name[class_name_len], class_suffix, sizeof(class_suffix)); 1359 1360 return file_name; 1361} 1362 1363ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry, 1364 const GrowableArray<ModuleClassPathList*>* const module_list) { 1365 int num_of_entries = module_list->length(); 1366 const Symbol* class_module_name = mod_entry->name(); 1367 1368 // Loop through all the modules in either the patch-module or exploded entries looking for module 1369 for (int i = 0; i < num_of_entries; i++) { 1370 ModuleClassPathList* module_cpl = module_list->at(i); 1371 Symbol* module_cpl_name = module_cpl->module_name(); 1372 1373 if (module_cpl_name->fast_compare(class_module_name) == 0) { 1374 // Class' module has been located. 1375 return module_cpl->module_first_entry(); 1376 } 1377 } 1378 return NULL; 1379} 1380 1381 1382// Search either the patch-module or exploded build entries for class. 1383ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list, 1384 const char* const class_name, 1385 const char* const file_name, 1386 TRAPS) { 1387 ClassFileStream* stream = NULL; 1388 1389 // Find the class' defining module in the boot loader's module entry table 1390 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL); 1391 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL; 1392 1393 // If the module system has not defined java.base yet, then 1394 // classes loaded are assumed to be defined to java.base. 1395 // When java.base is eventually defined by the module system, 1396 // all packages of classes that have been previously loaded 1397 // are verified in ModuleEntryTable::verify_javabase_packages(). 1398 if (!Universe::is_module_initialized() && 1399 !ModuleEntryTable::javabase_defined() && 1400 mod_entry == NULL) { 1401 mod_entry = ModuleEntryTable::javabase_moduleEntry(); 1402 } 1403 1404 // The module must be a named module 1405 ClassPathEntry* e = NULL; 1406 if (mod_entry != NULL && mod_entry->is_named()) { 1407 if (module_list == _exploded_entries) { 1408 // The exploded build entries can be added to at any time so a lock is 1409 // needed when searching them. 1410 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build"); 1411 MutexLocker ml(Module_lock, THREAD); 1412 e = find_first_module_cpe(mod_entry, module_list); 1413 } else { 1414 e = find_first_module_cpe(mod_entry, module_list); 1415 } 1416 } 1417 1418 // Try to load the class from the module's ClassPathEntry list. 1419 while (e != NULL) { 1420 stream = e->open_stream(file_name, CHECK_NULL); 1421 // No context.check is required since CDS is not supported 1422 // for an exploded modules build or if --patch-module is specified. 1423 if (NULL != stream) { 1424 return stream; 1425 } 1426 e = e->next(); 1427 } 1428 // If the module was located, break out even if the class was not 1429 // located successfully from that module's ClassPathEntry list. 1430 // There will not be another valid entry for that module. 1431 return NULL; 1432} 1433 1434InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) { 1435 assert(name != NULL, "invariant"); 1436 assert(THREAD->is_Java_thread(), "must be a JavaThread"); 1437 1438 ResourceMark rm(THREAD); 1439 HandleMark hm(THREAD); 1440 1441 const char* const class_name = name->as_C_string(); 1442 1443 EventMark m("loading class %s", class_name); 1444 1445 const char* const file_name = file_name_for_class_name(class_name, 1446 name->utf8_length()); 1447 assert(file_name != NULL, "invariant"); 1448 1449 ClassLoaderExt::Context context(class_name, file_name, THREAD); 1450 1451 // Lookup stream for parsing .class file 1452 ClassFileStream* stream = NULL; 1453 s2 classpath_index = 0; 1454 ClassPathEntry* e = NULL; 1455 1456 // If DumpSharedSpaces is true boot loader visibility boundaries are set to: 1457 // - [jimage] + [_first_append_entry to _last_append_entry] (all path entries). 1458 // 1459 // If search_append_only is true, boot loader visibility boundaries are 1460 // set to be _first_append_entry to the end. This includes: 1461 // [-Xbootclasspath/a]; [jvmti appended entries] 1462 // 1463 // If both DumpSharedSpaces and search_append_only are false, boot loader 1464 // visibility boundaries are set to be the --patch-module entries plus the base piece. 1465 // This would include: 1466 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build] 1467 // 1468 1469 // Load Attempt #1: --patch-module 1470 // Determine the class' defining module. If it appears in the _patch_mod_entries, 1471 // attempt to load the class from those locations specific to the module. 1472 // Specifications to --patch-module can contain a partial number of classes 1473 // that are part of the overall module definition. So if a particular class is not 1474 // found within its module specification, the search should continue to Load Attempt #2. 1475 // Note: The --patch-module entries are never searched if the boot loader's 1476 // visibility boundary is limited to only searching the append entries. 1477 if (_patch_mod_entries != NULL && !search_append_only) { 1478 // At CDS dump time, the --patch-module entries are ignored. That means a 1479 // class is still loaded from the runtime image even if it might 1480 // appear in the _patch_mod_entries. The runtime shared class visibility 1481 // check will determine if a shared class is visible based on the runtime 1482 // environemnt, including the runtime --patch-module setting. 1483 if (!DumpSharedSpaces) { 1484 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL); 1485 } 1486 } 1487 1488 // Load Attempt #2: [jimage | exploded build] 1489 if (!search_append_only && (NULL == stream)) { 1490 if (has_jrt_entry()) { 1491 e = _jrt_entry; 1492 stream = _jrt_entry->open_stream(file_name, CHECK_NULL); 1493 if (!context.check(stream, classpath_index)) { 1494 return NULL; 1495 } 1496 } else { 1497 // Exploded build - attempt to locate class in its defining module's location. 1498 assert(_exploded_entries != NULL, "No exploded build entries present"); 1499 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL); 1500 } 1501 } 1502 1503 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries] 1504 if ((search_append_only || DumpSharedSpaces) && (NULL == stream)) { 1505 // For the boot loader append path search, the starting classpath_index 1506 // for the appended piece is always 1 to account for either the 1507 // _jrt_entry or the _exploded_entries. 1508 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly"); 1509 classpath_index = 1; 1510 1511 e = _first_append_entry; 1512 while (e != NULL) { 1513 if (DumpSharedSpaces && classpath_index >= _num_boot_entries) { 1514 // Do not load any class from the app classpath using the boot loader. Let 1515 // the built-in app class laoder load them. 1516 break; 1517 } 1518 stream = e->open_stream(file_name, CHECK_NULL); 1519 if (!context.check(stream, classpath_index)) { 1520 return NULL; 1521 } 1522 if (NULL != stream) { 1523 break; 1524 } 1525 e = e->next(); 1526 ++classpath_index; 1527 } 1528 } 1529 1530 if (NULL == stream) { 1531 return NULL; 1532 } 1533 1534 stream->set_verify(context.should_verify(classpath_index)); 1535 1536 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 1537 Handle protection_domain; 1538 1539 InstanceKlass* result = KlassFactory::create_from_stream(stream, 1540 name, 1541 loader_data, 1542 protection_domain, 1543 NULL, // host_klass 1544 NULL, // cp_patches 1545 THREAD); 1546 if (HAS_PENDING_EXCEPTION) { 1547 if (DumpSharedSpaces) { 1548 tty->print_cr("Preload Error: Failed to load %s", class_name); 1549 } 1550 return NULL; 1551 } 1552 1553 return context.record_result(name, e, classpath_index, result, THREAD); 1554} 1555 1556#if INCLUDE_CDS 1557static char* skip_uri_protocol(char* source) { 1558 if (strncmp(source, "file:", 5) == 0) { 1559 // file: protocol path could start with file:/ or file:/// 1560 // locate the char after all the forward slashes 1561 int offset = 5; 1562 while (*(source + offset) == '/') { 1563 offset++; 1564 } 1565 source += offset; 1566 // for non-windows platforms, move back one char as the path begins with a '/' 1567#ifndef _WINDOWS 1568 source -= 1; 1569#endif 1570 } else if (strncmp(source, "jrt:/", 5) == 0) { 1571 source += 5; 1572 } 1573 return source; 1574} 1575 1576void ClassLoader::record_shared_class_loader_type(InstanceKlass* ik, const ClassFileStream* stream) { 1577 assert(DumpSharedSpaces, "sanity"); 1578 assert(stream != NULL, "sanity"); 1579 1580 if (ik->is_anonymous()) { 1581 // We do not archive anonymous classes. 1582 return; 1583 } 1584 1585 if (stream->source() == NULL) { 1586 if (ik->class_loader() == NULL) { 1587 // JFR classes 1588 ik->set_shared_classpath_index(0); 1589 ik->set_class_loader_type(ClassLoader::BOOT_LOADER); 1590 } 1591 return; 1592 } 1593 1594 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build"); 1595 1596 ModuleEntry* module = ik->module(); 1597 ClassPathEntry* e = NULL; 1598 int classpath_index = 0; 1599 1600 // Check if the class is from the runtime image 1601 if (module != NULL && (module->location() != NULL) && 1602 (module->location()->starts_with("jrt:"))) { 1603 e = _jrt_entry; 1604 classpath_index = 0; 1605 } else { 1606 classpath_index = 1; 1607 ResourceMark rm; 1608 char* canonical_path = NEW_RESOURCE_ARRAY(char, JVM_MAXPATHLEN); 1609 for (e = _first_append_entry; e != NULL; e = e->next()) { 1610 if (get_canonical_path(e->name(), canonical_path, JVM_MAXPATHLEN)) { 1611 char* src = (char*)stream->source(); 1612 // save the path from the file: protocol or the module name from the jrt: protocol 1613 // if no protocol prefix is found, src is the same as stream->source() after the following call 1614 src = skip_uri_protocol(src); 1615 if (strcmp(canonical_path, os::native_path((char*)src)) == 0) { 1616 break; 1617 } 1618 classpath_index ++; 1619 } 1620 } 1621 if (e == NULL) { 1622 assert(ik->shared_classpath_index() < 0, 1623 "must be a class from a custom jar which isn't in the class path or boot class path"); 1624 return; 1625 } 1626 } 1627 1628 if (classpath_index < _num_boot_entries) { 1629 // ik is either: 1630 // 1) a boot class loaded from the runtime image during vm initialization (classpath_index = 0); or 1631 // 2) a user's class from -Xbootclasspath/a (classpath_index > 0) 1632 // In the second case, the classpath_index, classloader_type will be recorded via 1633 // context.record_result() in ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS). 1634 if (classpath_index > 0) { 1635 return; 1636 } 1637 } 1638 1639 ResourceMark rm; 1640 const char* const class_name = ik->name()->as_C_string(); 1641 const char* const file_name = file_name_for_class_name(class_name, 1642 ik->name()->utf8_length()); 1643 assert(file_name != NULL, "invariant"); 1644 Thread* THREAD = Thread::current(); 1645 ClassLoaderExt::Context context(class_name, file_name, CATCH); 1646 context.record_result(ik->name(), e, classpath_index, ik, THREAD); 1647} 1648#endif // INCLUDE_CDS 1649 1650// Initialize the class loader's access to methods in libzip. Parse and 1651// process the boot classpath into a list ClassPathEntry objects. Once 1652// this list has been created, it must not change order (see class PackageInfo) 1653// it can be appended to and is by jvmti and the kernel vm. 1654 1655void ClassLoader::initialize() { 1656 EXCEPTION_MARK; 1657 1658 if (UsePerfData) { 1659 // jvmstat performance counters 1660 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time"); 1661 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime"); 1662 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self"); 1663 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime"); 1664 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self"); 1665 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime"); 1666 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self"); 1667 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses"); 1668 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses"); 1669 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses"); 1670 1671 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime"); 1672 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self"); 1673 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime"); 1674 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime"); 1675 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime"); 1676 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime"); 1677 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self"); 1678 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount"); 1679 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses"); 1680 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime"); 1681 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self"); 1682 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes"); 1683 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes"); 1684 1685 1686 // The following performance counters are added for measuring the impact 1687 // of the bug fix of 6365597. They are mainly focused on finding out 1688 // the behavior of system & user-defined classloader lock, whether 1689 // ClassLoader.loadClass/findClass is being called synchronized or not. 1690 // Also two additional counters are created to see whether 'UnsyncloadClass' 1691 // flag is being set or not and how many times load_instance_class call 1692 // fails with linkageError etc. 1693 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS, 1694 "systemLoaderLockContentionRate"); 1695 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS, 1696 "nonSystemLoaderLockContentionRate"); 1697 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS, 1698 "jvmFindLoadedClassNoLockCalls"); 1699 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS, 1700 "jvmDefineClassNoLockCalls"); 1701 1702 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS, 1703 "jniDefineClassNoLockCalls"); 1704 1705 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, 1706 "unsafeDefineClassCalls"); 1707 1708 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet"); 1709 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS, 1710 "loadInstanceClassFailRate"); 1711 1712 // increment the isUnsyncloadClass counter if UnsyncloadClass is set. 1713 if (UnsyncloadClass) { 1714 _isUnsyncloadClass->inc(); 1715 } 1716 } 1717 1718 // lookup zip library entry points 1719 load_zip_library(); 1720 // lookup jimage library entry points 1721 load_jimage_library(); 1722#if INCLUDE_CDS 1723 // initialize search path 1724 if (DumpSharedSpaces) { 1725 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info(); 1726 } 1727#endif 1728 setup_bootstrap_search_path(); 1729} 1730 1731#if INCLUDE_CDS 1732void ClassLoader::initialize_shared_path() { 1733 if (DumpSharedSpaces) { 1734 _num_boot_entries = _num_entries; 1735 ClassLoaderExt::setup_search_paths(); 1736 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check() 1737 } 1738} 1739#endif 1740 1741jlong ClassLoader::classloader_time_ms() { 1742 return UsePerfData ? 1743 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1; 1744} 1745 1746jlong ClassLoader::class_init_count() { 1747 return UsePerfData ? _perf_classes_inited->get_value() : -1; 1748} 1749 1750jlong ClassLoader::class_init_time_ms() { 1751 return UsePerfData ? 1752 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1; 1753} 1754 1755jlong ClassLoader::class_verify_time_ms() { 1756 return UsePerfData ? 1757 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1; 1758} 1759 1760jlong ClassLoader::class_link_count() { 1761 return UsePerfData ? _perf_classes_linked->get_value() : -1; 1762} 1763 1764jlong ClassLoader::class_link_time_ms() { 1765 return UsePerfData ? 1766 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1; 1767} 1768 1769int ClassLoader::compute_Object_vtable() { 1770 // hardwired for JDK1.2 -- would need to duplicate class file parsing 1771 // code to determine actual value from file 1772 // Would be value '11' if finals were in vtable 1773 int JDK_1_2_Object_vtable_size = 5; 1774 return JDK_1_2_Object_vtable_size * vtableEntry::size(); 1775} 1776 1777 1778void classLoader_init1() { 1779 ClassLoader::initialize(); 1780} 1781 1782// Complete the ClassPathEntry setup for the boot loader 1783void ClassLoader::classLoader_init2(TRAPS) { 1784 // Setup the list of module/path pairs for --patch-module processing 1785 // This must be done after the SymbolTable is created in order 1786 // to use fast_compare on module names instead of a string compare. 1787 if (Arguments::get_patch_mod_prefix() != NULL) { 1788 setup_patch_mod_entries(); 1789 } 1790 1791 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries 1792 // to successfully determine if java.base has been patched) 1793 create_javabase(); 1794 1795 // Setup the initial java.base/path pair for the exploded build entries. 1796 // As more modules are defined during module system initialization, more 1797 // entries will be added to the exploded build array. 1798 if (!has_jrt_entry()) { 1799 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds"); 1800 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds"); 1801 // Set up the boot loader's _exploded_entries list. Note that this gets 1802 // done before loading any classes, by the same thread that will 1803 // subsequently do the first class load. So, no lock is needed for this. 1804 assert(_exploded_entries == NULL, "Should only get initialized once"); 1805 _exploded_entries = new (ResourceObj::C_HEAP, mtModule) 1806 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true); 1807 add_to_exploded_build_list(vmSymbols::java_base(), CHECK); 1808 } 1809} 1810 1811 1812bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) { 1813 assert(orig != NULL && out != NULL && len > 0, "bad arguments"); 1814 if (CanonicalizeEntry != NULL) { 1815 JavaThread* THREAD = JavaThread::current(); 1816 JNIEnv* env = THREAD->jni_environment(); 1817 ResourceMark rm(THREAD); 1818 1819 // os::native_path writes into orig_copy 1820 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1); 1821 strcpy(orig_copy, orig); 1822 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) { 1823 return false; 1824 } 1825 } else { 1826 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing 1827 strncpy(out, orig, len); 1828 out[len - 1] = '\0'; 1829 } 1830 return true; 1831} 1832 1833void ClassLoader::create_javabase() { 1834 Thread* THREAD = Thread::current(); 1835 1836 // Create java.base's module entry for the boot 1837 // class loader prior to loading j.l.Ojbect. 1838 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data(); 1839 1840 // Get module entry table 1841 ModuleEntryTable* null_cld_modules = null_cld->modules(); 1842 if (null_cld_modules == NULL) { 1843 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader"); 1844 } 1845 1846 { 1847 MutexLocker ml(Module_lock, THREAD); 1848 ModuleEntry* jb_module = null_cld_modules->locked_create_entry_or_null(Handle(), 1849 false, vmSymbols::java_base(), NULL, NULL, null_cld); 1850 if (jb_module == NULL) { 1851 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME); 1852 } 1853 ModuleEntryTable::set_javabase_moduleEntry(jb_module); 1854 } 1855} 1856 1857#ifndef PRODUCT 1858 1859// CompileTheWorld 1860// 1861// Iterates over all class path entries and forces compilation of all methods 1862// in all classes found. Currently, only zip/jar archives are searched. 1863// 1864// The classes are loaded by the Java level bootstrap class loader, and the 1865// initializer is called. If DelayCompilationDuringStartup is true (default), 1866// the interpreter will run the initialization code. Note that forcing 1867// initialization in this way could potentially lead to initialization order 1868// problems, in which case we could just force the initialization bit to be set. 1869 1870 1871// We need to iterate over the contents of a zip/jar file, so we replicate the 1872// jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile, 1873// since jzfile already has a void* definition. 1874// 1875// Note that this is only used in debug mode. 1876// 1877// HotSpot integration note: 1878// Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build 1879 1880 1881// JDK 1.3 version 1882typedef struct real_jzentry { /* Zip file entry */ 1883 char *name; /* entry name */ 1884 jint time; /* modification time */ 1885 jint size; /* size of uncompressed data */ 1886 jint csize; /* size of compressed data (zero if uncompressed) */ 1887 jint crc; /* crc of uncompressed data */ 1888 char *comment; /* optional zip file comment */ 1889 jbyte *extra; /* optional extra data */ 1890 jint pos; /* position of LOC header (if negative) or data */ 1891} real_jzentry; 1892 1893typedef struct real_jzfile { /* Zip file */ 1894 char *name; /* zip file name */ 1895 jint refs; /* number of active references */ 1896 jint fd; /* open file descriptor */ 1897 void *lock; /* read lock */ 1898 char *comment; /* zip file comment */ 1899 char *msg; /* zip error message */ 1900 void *entries; /* array of hash cells */ 1901 jint total; /* total number of entries */ 1902 unsigned short *table; /* Hash chain heads: indexes into entries */ 1903 jint tablelen; /* number of hash eads */ 1904 real_jzfile *next; /* next zip file in search list */ 1905 jzentry *cache; /* we cache the most recently freed jzentry */ 1906 /* Information on metadata names in META-INF directory */ 1907 char **metanames; /* array of meta names (may have null names) */ 1908 jint metacount; /* number of slots in metanames array */ 1909 /* If there are any per-entry comments, they are in the comments array */ 1910 char **comments; 1911} real_jzfile; 1912 1913void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) { 1914 // For now we only compile all methods in all classes in zip/jar files 1915 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir); 1916 tty->cr(); 1917} 1918 1919void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) { 1920 real_jzfile* zip = (real_jzfile*) _zip; 1921 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name); 1922 tty->cr(); 1923 // Iterate over all entries in zip file 1924 for (int n = 0; ; n++) { 1925 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n)); 1926 if (ze == NULL) break; 1927 ClassLoader::compile_the_world_in(ze->name, loader, CHECK); 1928 } 1929 if (HAS_PENDING_EXCEPTION) { 1930 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1931 CLEAR_PENDING_EXCEPTION; 1932 tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); 1933 tty->print_cr("Increase class metadata storage if a limit was set"); 1934 } else { 1935 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); 1936 } 1937 } 1938} 1939 1940void ClassLoader::compile_the_world() { 1941 EXCEPTION_MARK; 1942 HandleMark hm(THREAD); 1943 ResourceMark rm(THREAD); 1944 1945 assert(has_jrt_entry(), "Compile The World not supported with exploded module build"); 1946 1947 // Find bootstrap loader 1948 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader()); 1949 jlong start = os::javaTimeMillis(); 1950 1951 // Compile the world for the modular java runtime image 1952 _jrt_entry->compile_the_world(system_class_loader, CATCH); 1953 1954 // Iterate over all bootstrap class path appended entries 1955 ClassPathEntry* e = _first_append_entry; 1956 while (e != NULL) { 1957 assert(!e->is_jrt(), "A modular java runtime image is present on the list of appended entries"); 1958 e->compile_the_world(system_class_loader, CATCH); 1959 e = e->next(); 1960 } 1961 jlong end = os::javaTimeMillis(); 1962 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)", 1963 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start)); 1964 { 1965 // Print statistics as if before normal exit: 1966 extern void print_statistics(); 1967 print_statistics(); 1968 } 1969 vm_exit(0); 1970} 1971 1972int ClassLoader::_compile_the_world_class_counter = 0; 1973int ClassLoader::_compile_the_world_method_counter = 0; 1974static int _codecache_sweep_counter = 0; 1975 1976// Filter out all exceptions except OOMs 1977static void clear_pending_exception_if_not_oom(TRAPS) { 1978 if (HAS_PENDING_EXCEPTION && 1979 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1980 CLEAR_PENDING_EXCEPTION; 1981 } 1982 // The CHECK at the caller will propagate the exception out 1983} 1984 1985/** 1986 * Returns if the given method should be compiled when doing compile-the-world. 1987 * 1988 * TODO: This should be a private method in a CompileTheWorld class. 1989 */ 1990static bool can_be_compiled(const methodHandle& m, int comp_level) { 1991 assert(CompileTheWorld, "must be"); 1992 1993 // It's not valid to compile a native wrapper for MethodHandle methods 1994 // that take a MemberName appendix since the bytecode signature is not 1995 // correct. 1996 vmIntrinsics::ID iid = m->intrinsic_id(); 1997 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) { 1998 return false; 1999 } 2000 2001 return CompilationPolicy::can_be_compiled(m, comp_level); 2002} 2003 2004void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) { 2005 if (string_ends_with(name, ".class")) { 2006 // We have a .class file 2007 int len = (int)strlen(name); 2008 char buffer[2048]; 2009 strncpy(buffer, name, len - 6); 2010 buffer[len-6] = 0; 2011 // If the file has a period after removing .class, it's not really a 2012 // valid class file. The class loader will check everything else. 2013 if (strchr(buffer, '.') == NULL) { 2014 _compile_the_world_class_counter++; 2015 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return; 2016 2017 // Construct name without extension 2018 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK); 2019 // Use loader to load and initialize class 2020 Klass* k = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD); 2021 if (k != NULL && !HAS_PENDING_EXCEPTION) { 2022 k->initialize(THREAD); 2023 } 2024 bool exception_occurred = HAS_PENDING_EXCEPTION; 2025 clear_pending_exception_if_not_oom(CHECK); 2026 if (CompileTheWorldPreloadClasses && k != NULL) { 2027 InstanceKlass* ik = InstanceKlass::cast(k); 2028 ConstantPool::preload_and_initialize_all_classes(ik->constants(), THREAD); 2029 if (HAS_PENDING_EXCEPTION) { 2030 // If something went wrong in preloading we just ignore it 2031 clear_pending_exception_if_not_oom(CHECK); 2032 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer); 2033 } 2034 } 2035 2036 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) { 2037 if (k == NULL || exception_occurred) { 2038 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class 2039 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer); 2040 } else { 2041 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer); 2042 // Preload all classes to get around uncommon traps 2043 // Iterate over all methods in class 2044 int comp_level = CompilationPolicy::policy()->initial_compile_level(); 2045 InstanceKlass* ik = InstanceKlass::cast(k); 2046 for (int n = 0; n < ik->methods()->length(); n++) { 2047 methodHandle m (THREAD, ik->methods()->at(n)); 2048 if (can_be_compiled(m, comp_level)) { 2049 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) { 2050 // Give sweeper a chance to keep up with CTW 2051 VM_CTWThreshold op; 2052 VMThread::execute(&op); 2053 _codecache_sweep_counter = 0; 2054 } 2055 // Force compilation 2056 CompileBroker::compile_method(m, InvocationEntryBci, comp_level, 2057 methodHandle(), 0, CompileTask::Reason_CTW, THREAD); 2058 if (HAS_PENDING_EXCEPTION) { 2059 clear_pending_exception_if_not_oom(CHECK); 2060 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 2061 } else { 2062 _compile_the_world_method_counter++; 2063 } 2064 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) { 2065 // Clobber the first compile and force second tier compilation 2066 CompiledMethod* nm = m->code(); 2067 if (nm != NULL && !m->is_method_handle_intrinsic()) { 2068 // Throw out the code so that the code cache doesn't fill up 2069 nm->make_not_entrant(); 2070 } 2071 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization, 2072 methodHandle(), 0, CompileTask::Reason_CTW, THREAD); 2073 if (HAS_PENDING_EXCEPTION) { 2074 clear_pending_exception_if_not_oom(CHECK); 2075 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 2076 } else { 2077 _compile_the_world_method_counter++; 2078 } 2079 } 2080 } else { 2081 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 2082 } 2083 2084 CompiledMethod* nm = m->code(); 2085 if (nm != NULL && !m->is_method_handle_intrinsic()) { 2086 // Throw out the code so that the code cache doesn't fill up 2087 nm->make_not_entrant(); 2088 } 2089 } 2090 } 2091 } 2092 } 2093 } 2094} 2095 2096#endif //PRODUCT 2097 2098// Please keep following two functions at end of this file. With them placed at top or in middle of the file, 2099// they could get inlined by agressive compiler, an unknown trick, see bug 6966589. 2100void PerfClassTraceTime::initialize() { 2101 if (!UsePerfData) return; 2102 2103 if (_eventp != NULL) { 2104 // increment the event counter 2105 _eventp->inc(); 2106 } 2107 2108 // stop the current active thread-local timer to measure inclusive time 2109 _prev_active_event = -1; 2110 for (int i=0; i < EVENT_TYPE_COUNT; i++) { 2111 if (_timers[i].is_active()) { 2112 assert(_prev_active_event == -1, "should have only one active timer"); 2113 _prev_active_event = i; 2114 _timers[i].stop(); 2115 } 2116 } 2117 2118 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) { 2119 // start the inclusive timer if not recursively called 2120 _t.start(); 2121 } 2122 2123 // start thread-local timer of the given event type 2124 if (!_timers[_event_type].is_active()) { 2125 _timers[_event_type].start(); 2126 } 2127} 2128 2129PerfClassTraceTime::~PerfClassTraceTime() { 2130 if (!UsePerfData) return; 2131 2132 // stop the thread-local timer as the event completes 2133 // and resume the thread-local timer of the event next on the stack 2134 _timers[_event_type].stop(); 2135 jlong selftime = _timers[_event_type].ticks(); 2136 2137 if (_prev_active_event >= 0) { 2138 _timers[_prev_active_event].start(); 2139 } 2140 2141 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return; 2142 2143 // increment the counters only on the leaf call 2144 _t.stop(); 2145 _timep->inc(_t.ticks()); 2146 if (_selftimep != NULL) { 2147 _selftimep->inc(selftime); 2148 } 2149 // add all class loading related event selftime to the accumulated time counter 2150 ClassLoader::perf_accumulated_time()->inc(selftime); 2151 2152 // reset the timer 2153 _timers[_event_type].reset(); 2154} 2155