1 /* 2 * Copyright (c) 1997, 2015, 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/classFileParser.hpp" 27 #include "classfile/classFileStream.hpp" 28 #include "classfile/classLoader.hpp" 29 #include "classfile/classLoaderExt.hpp" 30 #include "classfile/classLoaderData.inline.hpp" 31 #include "classfile/imageFile.hpp" 32 #include "classfile/javaClasses.hpp" 33 #include "classfile/systemDictionary.hpp" 34 #include "classfile/vmSymbols.hpp" 35 #include "compiler/compileBroker.hpp" 36 #include "gc_interface/collectedHeap.inline.hpp" 37 #include "interpreter/bytecodeStream.hpp" 38 #include "interpreter/oopMapCache.hpp" 39 #include "memory/allocation.inline.hpp" 40 #include "memory/filemap.hpp" 41 #include "memory/generation.hpp" 42 #include "memory/oopFactory.hpp" 43 #include "memory/universe.inline.hpp" 44 #include "oops/instanceKlass.hpp" 45 #include "oops/instanceRefKlass.hpp" 46 #include "oops/oop.inline.hpp" 47 #include "oops/symbol.hpp" 48 #include "prims/jvm_misc.hpp" 49 #include "runtime/arguments.hpp" 50 #include "runtime/compilationPolicy.hpp" 51 #include "runtime/fprofiler.hpp" 52 #include "runtime/handles.hpp" 53 #include "runtime/handles.inline.hpp" 54 #include "runtime/init.hpp" 55 #include "runtime/interfaceSupport.hpp" 56 #include "runtime/java.hpp" 57 #include "runtime/javaCalls.hpp" 58 #include "runtime/os.hpp" 59 #include "runtime/threadCritical.hpp" 60 #include "runtime/timer.hpp" 61 #include "services/management.hpp" 62 #include "services/threadService.hpp" 63 #include "utilities/events.hpp" 64 #include "utilities/hashtable.inline.hpp" 65 #include "utilities/macros.hpp" 66 #if INCLUDE_CDS 67 #include "classfile/sharedPathsMiscInfo.hpp" 68 #include "classfile/sharedClassUtil.hpp" 69 #endif 70 71 72 // Entry points in zip.dll for loading zip/jar file entries and image file entries 73 74 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg); 75 typedef void (JNICALL *ZipClose_t)(jzfile *zip); 76 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen); 77 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf); 78 typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf); 79 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n); 80 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg); 81 typedef jint (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len); 82 83 static ZipOpen_t ZipOpen = NULL; 84 static ZipClose_t ZipClose = NULL; 85 static FindEntry_t FindEntry = NULL; 86 static ReadEntry_t ReadEntry = NULL; 87 static ReadMappedEntry_t ReadMappedEntry = NULL; 88 static GetNextEntry_t GetNextEntry = NULL; 89 static canonicalize_fn_t CanonicalizeEntry = NULL; 90 static ZipInflateFully_t ZipInflateFully = NULL; 91 static Crc32_t Crc32 = NULL; 92 93 // Globals 94 95 PerfCounter* ClassLoader::_perf_accumulated_time = NULL; 96 PerfCounter* ClassLoader::_perf_classes_inited = NULL; 97 PerfCounter* ClassLoader::_perf_class_init_time = NULL; 98 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL; 99 PerfCounter* ClassLoader::_perf_classes_verified = NULL; 100 PerfCounter* ClassLoader::_perf_class_verify_time = NULL; 101 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL; 102 PerfCounter* ClassLoader::_perf_classes_linked = NULL; 103 PerfCounter* ClassLoader::_perf_class_link_time = NULL; 104 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL; 105 PerfCounter* ClassLoader::_perf_class_parse_time = NULL; 106 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL; 107 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL; 108 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL; 109 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL; 110 PerfCounter* ClassLoader::_perf_app_classload_time = NULL; 111 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL; 112 PerfCounter* ClassLoader::_perf_app_classload_count = NULL; 113 PerfCounter* ClassLoader::_perf_define_appclasses = NULL; 114 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL; 115 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL; 116 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL; 117 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL; 118 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL; 119 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL; 120 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL; 121 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL; 122 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL; 123 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL; 124 PerfCounter* ClassLoader::_isUnsyncloadClass = NULL; 125 PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL; 126 127 ClassPathEntry* ClassLoader::_first_entry = NULL; 128 ClassPathEntry* ClassLoader::_last_entry = NULL; 129 int ClassLoader::_num_entries = 0; 130 PackageHashtable* ClassLoader::_package_hash_table = NULL; 131 132 #if INCLUDE_CDS 133 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL; 134 #endif 135 // helper routines 136 bool string_starts_with(const char* str, const char* str_to_find) { 137 size_t str_len = strlen(str); 138 size_t str_to_find_len = strlen(str_to_find); 139 if (str_to_find_len > str_len) { 140 return false; 141 } 142 return (strncmp(str, str_to_find, str_to_find_len) == 0); 143 } 144 145 bool string_ends_with(const char* str, const char* str_to_find) { 146 size_t str_len = strlen(str); 147 size_t str_to_find_len = strlen(str_to_find); 148 if (str_to_find_len > str_len) { 149 return false; 150 } 151 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0); 152 } 153 154 155 ClassPathEntry::ClassPathEntry() { 156 set_next(NULL); 157 } 158 159 160 bool ClassPathEntry::is_lazy() { 161 return false; 162 } 163 164 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() { 165 char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass); 166 strcpy(copy, dir); 167 _dir = copy; 168 } 169 170 171 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) { 172 // construct full path name 173 char path[JVM_MAXPATHLEN]; 174 if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) { 175 return NULL; 176 } 177 // check if file exists 178 struct stat st; 179 if (os::stat(path, &st) == 0) { 180 #if INCLUDE_CDS 181 if (DumpSharedSpaces) { 182 // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so 183 // we should never find a file underneath it -- unless user has added a new file while we are running 184 // the dump, in which case let's quit! 185 ShouldNotReachHere(); 186 } 187 #endif 188 // found file, open it 189 int file_handle = os::open(path, 0, 0); 190 if (file_handle != -1) { 191 // read contents into resource array 192 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size); 193 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size); 194 // close file 195 os::close(file_handle); 196 // construct ClassFileStream 197 if (num_read == (size_t)st.st_size) { 198 if (UsePerfData) { 199 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read); 200 } 201 return new ClassFileStream(buffer, st.st_size, _dir); // Resource allocated 202 } 203 } 204 } 205 return NULL; 206 } 207 208 209 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() { 210 _zip = zip; 211 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass); 212 strcpy(copy, zip_name); 213 _zip_name = copy; 214 } 215 216 ClassPathZipEntry::~ClassPathZipEntry() { 217 if (ZipClose != NULL) { 218 (*ZipClose)(_zip); 219 } 220 FREE_C_HEAP_ARRAY(char, _zip_name); 221 } 222 223 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) { 224 // enable call to C land 225 JavaThread* thread = JavaThread::current(); 226 ThreadToNativeFromVM ttn(thread); 227 // check whether zip archive contains name 228 jint name_len; 229 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len); 230 if (entry == NULL) return NULL; 231 u1* buffer; 232 char name_buf[128]; 233 char* filename; 234 if (name_len < 128) { 235 filename = name_buf; 236 } else { 237 filename = NEW_RESOURCE_ARRAY(char, name_len + 1); 238 } 239 240 // file found, get pointer to the entry in mmapped jar file. 241 if (ReadMappedEntry == NULL || 242 !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) { 243 // mmapped access not available, perhaps due to compression, 244 // read contents into resource array 245 int size = (*filesize) + ((nul_terminate) ? 1 : 0); 246 buffer = NEW_RESOURCE_ARRAY(u1, size); 247 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL; 248 } 249 250 // return result 251 if (nul_terminate) { 252 buffer[*filesize] = 0; 253 } 254 return buffer; 255 } 256 257 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) { 258 jint filesize; 259 u1* buffer = open_entry(name, &filesize, false, CHECK_NULL); 260 if (buffer == NULL) { 261 return NULL; 262 } 263 if (UsePerfData) { 264 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize); 265 } 266 return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated 267 } 268 269 // invoke function for each entry in the zip file 270 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) { 271 JavaThread* thread = JavaThread::current(); 272 HandleMark handle_mark(thread); 273 ThreadToNativeFromVM ttn(thread); 274 for (int n = 0; ; n++) { 275 jzentry * ze = ((*GetNextEntry)(_zip, n)); 276 if (ze == NULL) break; 277 (*f)(ze->name, context); 278 } 279 } 280 281 LazyClassPathEntry::LazyClassPathEntry(const char* path, const struct stat* st, bool throw_exception) : ClassPathEntry() { 282 _path = os::strdup_check_oom(path); 283 _st = *st; 284 _resolved_entry = NULL; 285 _has_error = false; 286 _throw_exception = throw_exception; 287 } 288 289 LazyClassPathEntry::~LazyClassPathEntry() { 290 os::free((void*)_path); 291 } 292 293 bool LazyClassPathEntry::is_jar_file() { 294 size_t len = strlen(_path); 295 if (len < 4 || strcmp(_path + len - 4, ".jar") != 0) return false; 296 return ((_st.st_mode & S_IFREG) == S_IFREG); 297 } 298 299 ClassPathEntry* LazyClassPathEntry::resolve_entry(TRAPS) { 300 if (_resolved_entry != NULL) { 301 return (ClassPathEntry*) _resolved_entry; 302 } 303 ClassPathEntry* new_entry = NULL; 304 new_entry = ClassLoader::create_class_path_entry(_path, &_st, false, _throw_exception, CHECK_NULL); 305 if (!_throw_exception && new_entry == NULL) { 306 assert(!HAS_PENDING_EXCEPTION, "must be"); 307 return NULL; 308 } 309 { 310 ThreadCritical tc; 311 if (_resolved_entry == NULL) { 312 _resolved_entry = new_entry; 313 return new_entry; 314 } 315 } 316 assert(_resolved_entry != NULL, "bug in MT-safe resolution logic"); 317 delete new_entry; 318 return (ClassPathEntry*) _resolved_entry; 319 } 320 321 ClassFileStream* LazyClassPathEntry::open_stream(const char* name, TRAPS) { 322 if (_has_error) { 323 return NULL; 324 } 325 ClassPathEntry* cpe = resolve_entry(THREAD); 326 if (cpe == NULL) { 327 _has_error = true; 328 return NULL; 329 } else { 330 return cpe->open_stream(name, THREAD); 331 } 332 } 333 334 bool LazyClassPathEntry::is_lazy() { 335 return true; 336 } 337 338 u1* LazyClassPathEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) { 339 if (_has_error) { 340 return NULL; 341 } 342 ClassPathEntry* cpe = resolve_entry(THREAD); 343 if (cpe == NULL) { 344 _has_error = true; 345 return NULL; 346 } else if (cpe->is_jar_file()) { 347 return ((ClassPathZipEntry*)cpe)->open_entry(name, filesize, nul_terminate,THREAD); 348 } else { 349 ShouldNotReachHere(); 350 *filesize = 0; 351 return NULL; 352 } 353 } 354 355 ClassPathImageEntry::ClassPathImageEntry(char* name) : ClassPathEntry(), _image(new ImageFile(name)) { 356 bool opened = _image->open(); 357 if (!opened) { 358 _image = NULL; 359 } 360 } 361 362 ClassPathImageEntry::~ClassPathImageEntry() { 363 if (_image) { 364 _image->close(); 365 _image = NULL; 366 } 367 } 368 369 const char* ClassPathImageEntry::name() { 370 return _image ? _image->name() : ""; 371 } 372 373 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) { 374 u1* buffer; 375 u8 size; 376 _image->get_resource(name, buffer, size); 377 378 if (buffer) { 379 if (UsePerfData) { 380 ClassLoader::perf_sys_classfile_bytes_read()->inc(size); 381 } 382 return new ClassFileStream(buffer, (int)size, (char*)name); // Resource allocated 383 } 384 385 return NULL; 386 } 387 388 #ifndef PRODUCT 389 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) { 390 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name()); 391 tty->cr(); 392 const ImageStrings strings = _image->get_strings(); 393 // Retrieve each path component string. 394 u4 count = _image->get_location_count(); 395 for (u4 i = 0; i < count; i++) { 396 u1* location_data = _image->get_location_data(i); 397 398 if (location_data) { 399 ImageLocation location(location_data); 400 const char* parent = location.get_attribute(ImageLocation::ATTRIBUTE_PARENT, strings); 401 const char* base = location.get_attribute(ImageLocation::ATTRIBUTE_BASE, strings); 402 const char* extension = location.get_attribute(ImageLocation::ATTRIBUTE_EXTENSION, strings); 403 assert((strlen(parent) + strlen(base) + strlen(extension)) < JVM_MAXPATHLEN, "path exceeds buffer"); 404 char path[JVM_MAXPATHLEN]; 405 strcpy(path, parent); 406 strcat(path, base); 407 strcat(path, extension); 408 ClassLoader::compile_the_world_in(path, loader, CHECK); 409 } 410 } 411 if (HAS_PENDING_EXCEPTION) { 412 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 413 CLEAR_PENDING_EXCEPTION; 414 tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); 415 tty->print_cr("Increase class metadata storage if a limit was set"); 416 } else { 417 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); 418 } 419 } 420 } 421 422 bool ClassPathImageEntry::is_jrt() { 423 return string_ends_with(name(), "bootmodules.jimage"); 424 } 425 #endif 426 427 #if INCLUDE_CDS 428 void ClassLoader::exit_with_path_failure(const char* error, const char* message) { 429 assert(DumpSharedSpaces, "only called at dump time"); 430 tty->print_cr("Hint: enable -XX:+TraceClassPaths to diagnose the failure"); 431 vm_exit_during_initialization(error, message); 432 } 433 #endif 434 435 void ClassLoader::trace_class_path(const char* msg, const char* name) { 436 if (!TraceClassPaths) { 437 return; 438 } 439 440 if (msg) { 441 tty->print("%s", msg); 442 } 443 if (name) { 444 if (strlen(name) < 256) { 445 tty->print("%s", name); 446 } else { 447 // For very long paths, we need to print each character separately, 448 // as print_cr() has a length limit 449 while (name[0] != '\0') { 450 tty->print("%c", name[0]); 451 name++; 452 } 453 } 454 } 455 if (msg && msg[0] == '[') { 456 tty->print_cr("]"); 457 } else { 458 tty->cr(); 459 } 460 } 461 462 #if INCLUDE_CDS 463 void ClassLoader::check_shared_classpath(const char *path) { 464 if (strcmp(path, "") == 0) { 465 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL); 466 } 467 468 struct stat st; 469 if (os::stat(path, &st) == 0) { 470 if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory 471 if (!os::dir_is_empty(path)) { 472 tty->print_cr("Error: non-empty directory '%s'", path); 473 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL); 474 } 475 } 476 } 477 } 478 #endif 479 480 void ClassLoader::setup_bootstrap_search_path() { 481 assert(_first_entry == NULL, "should not setup bootstrap class search path twice"); 482 const char* sys_class_path = Arguments::get_sysclasspath(); 483 if (PrintSharedArchiveAndExit) { 484 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily 485 // the same as the bootcp of the shared archive. 486 } else { 487 trace_class_path("[Bootstrap loader class path=", sys_class_path); 488 } 489 #if INCLUDE_CDS 490 if (DumpSharedSpaces) { 491 _shared_paths_misc_info->add_boot_classpath(sys_class_path); 492 } 493 #endif 494 setup_search_path(sys_class_path); 495 } 496 497 #if INCLUDE_CDS 498 int ClassLoader::get_shared_paths_misc_info_size() { 499 return _shared_paths_misc_info->get_used_bytes(); 500 } 501 502 void* ClassLoader::get_shared_paths_misc_info() { 503 return _shared_paths_misc_info->buffer(); 504 } 505 506 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) { 507 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size); 508 bool result = checker->check(); 509 delete checker; 510 return result; 511 } 512 #endif 513 514 void ClassLoader::setup_search_path(const char *class_path) { 515 int offset = 0; 516 int len = (int)strlen(class_path); 517 int end = 0; 518 519 // Iterate over class path entries 520 for (int start = 0; start < len; start = end) { 521 while (class_path[end] && class_path[end] != os::path_separator()[0]) { 522 end++; 523 } 524 EXCEPTION_MARK; 525 ResourceMark rm(THREAD); 526 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1); 527 strncpy(path, &class_path[start], end - start); 528 path[end - start] = '\0'; 529 update_class_path_entry_list(path, false); 530 #if INCLUDE_CDS 531 if (DumpSharedSpaces) { 532 check_shared_classpath(path); 533 } 534 #endif 535 while (class_path[end] == os::path_separator()[0]) { 536 end++; 537 } 538 } 539 } 540 541 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st, 542 bool lazy, bool throw_exception, TRAPS) { 543 JavaThread* thread = JavaThread::current(); 544 if (lazy) { 545 return new LazyClassPathEntry(path, st, throw_exception); 546 } 547 ClassPathEntry* new_entry = NULL; 548 if ((st->st_mode & S_IFREG) == S_IFREG) { 549 // Regular file, should be a zip or image file 550 // Canonicalized filename 551 char canonical_path[JVM_MAXPATHLEN]; 552 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 553 // This matches the classic VM 554 if (throw_exception) { 555 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL); 556 } else { 557 return NULL; 558 } 559 } 560 // TODO - add proper criteria for selecting image file 561 ClassPathImageEntry* entry = new ClassPathImageEntry(canonical_path); 562 if (entry->is_open()) { 563 new_entry = entry; 564 } else { 565 char* error_msg = NULL; 566 jzfile* zip; 567 { 568 // enable call to C land 569 ThreadToNativeFromVM ttn(thread); 570 HandleMark hm(thread); 571 zip = (*ZipOpen)(canonical_path, &error_msg); 572 } 573 if (zip != NULL && error_msg == NULL) { 574 new_entry = new ClassPathZipEntry(zip, path); 575 } else { 576 ResourceMark rm(thread); 577 char *msg; 578 if (error_msg == NULL) { 579 msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ; 580 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path); 581 } else { 582 int len = (int)(strlen(path) + strlen(error_msg) + 128); 583 msg = NEW_RESOURCE_ARRAY(char, len); ; 584 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path); 585 } 586 if (throw_exception) { 587 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL); 588 } else { 589 return NULL; 590 } 591 } 592 } 593 if (TraceClassLoading || TraceClassPaths) { 594 tty->print_cr("[Opened %s]", path); 595 } 596 } else { 597 // Directory 598 new_entry = new ClassPathDirEntry(path); 599 if (TraceClassLoading) { 600 tty->print_cr("[Path %s]", path); 601 } 602 } 603 return new_entry; 604 } 605 606 607 // Create a class path zip entry for a given path (return NULL if not found 608 // or zip/JAR file cannot be opened) 609 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) { 610 // check for a regular file 611 struct stat st; 612 if (os::stat(path, &st) == 0) { 613 if ((st.st_mode & S_IFREG) == S_IFREG) { 614 char canonical_path[JVM_MAXPATHLEN]; 615 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 616 char* error_msg = NULL; 617 jzfile* zip; 618 { 619 // enable call to C land 620 JavaThread* thread = JavaThread::current(); 621 ThreadToNativeFromVM ttn(thread); 622 HandleMark hm(thread); 623 zip = (*ZipOpen)(canonical_path, &error_msg); 624 } 625 if (zip != NULL && error_msg == NULL) { 626 // create using canonical path 627 return new ClassPathZipEntry(zip, canonical_path); 628 } 629 } 630 } 631 } 632 return NULL; 633 } 634 635 // returns true if entry already on class path 636 bool ClassLoader::contains_entry(ClassPathEntry *entry) { 637 ClassPathEntry* e = _first_entry; 638 while (e != NULL) { 639 // assume zip entries have been canonicalized 640 if (strcmp(entry->name(), e->name()) == 0) { 641 return true; 642 } 643 e = e->next(); 644 } 645 return false; 646 } 647 648 void ClassLoader::add_to_list(ClassPathEntry *new_entry) { 649 if (new_entry != NULL) { 650 if (_last_entry == NULL) { 651 _first_entry = _last_entry = new_entry; 652 } else { 653 _last_entry->set_next(new_entry); 654 _last_entry = new_entry; 655 } 656 } 657 _num_entries ++; 658 } 659 660 // Returns true IFF the file/dir exists and the entry was successfully created. 661 bool ClassLoader::update_class_path_entry_list(const char *path, 662 bool check_for_duplicates, 663 bool throw_exception) { 664 struct stat st; 665 if (os::stat(path, &st) == 0) { 666 // File or directory found 667 ClassPathEntry* new_entry = NULL; 668 Thread* THREAD = Thread::current(); 669 new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, throw_exception, CHECK_(false)); 670 if (new_entry == NULL) { 671 return false; 672 } 673 // The kernel VM adds dynamically to the end of the classloader path and 674 // doesn't reorder the bootclasspath which would break java.lang.Package 675 // (see PackageInfo). 676 // Add new entry to linked list 677 if (!check_for_duplicates || !contains_entry(new_entry)) { 678 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry); 679 } 680 return true; 681 } else { 682 #if INCLUDE_CDS 683 if (DumpSharedSpaces) { 684 _shared_paths_misc_info->add_nonexist_path(path); 685 } 686 #endif 687 return false; 688 } 689 } 690 691 void ClassLoader::print_bootclasspath() { 692 ClassPathEntry* e = _first_entry; 693 tty->print("[bootclasspath= "); 694 while (e != NULL) { 695 tty->print("%s ;", e->name()); 696 e = e->next(); 697 } 698 tty->print_cr("]"); 699 } 700 701 void ClassLoader::load_zip_library() { 702 assert(ZipOpen == NULL, "should not load zip library twice"); 703 // First make sure native library is loaded 704 os::native_java_library(); 705 // Load zip library 706 char path[JVM_MAXPATHLEN]; 707 char ebuf[1024]; 708 void* handle = NULL; 709 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) { 710 handle = os::dll_load(path, ebuf, sizeof ebuf); 711 } 712 if (handle == NULL) { 713 vm_exit_during_initialization("Unable to load ZIP library", path); 714 } 715 // Lookup zip entry points 716 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open")); 717 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close")); 718 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry")); 719 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry")); 720 ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry")); 721 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry")); 722 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully")); 723 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32")); 724 725 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL 726 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL || 727 GetNextEntry == NULL || Crc32 == NULL) { 728 vm_exit_during_initialization("Corrupted ZIP library", path); 729 } 730 731 if (ZipInflateFully == NULL) { 732 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path); 733 } 734 735 // Lookup canonicalize entry in libjava.dll 736 void *javalib_handle = os::native_java_library(); 737 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize")); 738 // This lookup only works on 1.3. Do not check for non-null here 739 } 740 741 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) { 742 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg); 743 } 744 745 int ClassLoader::crc32(int crc, const char* buf, int len) { 746 assert(Crc32 != NULL, "ZIP_CRC32 is not found"); 747 return (*Crc32)(crc, (const jbyte*)buf, len); 748 } 749 750 // PackageInfo data exists in order to support the java.lang.Package 751 // class. A Package object provides information about a java package 752 // (version, vendor, etc.) which originates in the manifest of the jar 753 // file supplying the package. For application classes, the ClassLoader 754 // object takes care of this. 755 756 // For system (boot) classes, the Java code in the Package class needs 757 // to be able to identify which source jar file contained the boot 758 // class, so that it can extract the manifest from it. This table 759 // identifies java packages with jar files in the boot classpath. 760 761 // Because the boot classpath cannot change, the classpath index is 762 // sufficient to identify the source jar file or directory. (Since 763 // directories have no manifests, the directory name is not required, 764 // but is available.) 765 766 // When using sharing -- the pathnames of entries in the boot classpath 767 // may not be the same at runtime as they were when the archive was 768 // created (NFS, Samba, etc.). The actual files and directories named 769 // in the classpath must be the same files, in the same order, even 770 // though the exact name is not the same. 771 772 class PackageInfo: public BasicHashtableEntry<mtClass> { 773 public: 774 const char* _pkgname; // Package name 775 int _classpath_index; // Index of directory or JAR file loaded from 776 777 PackageInfo* next() { 778 return (PackageInfo*)BasicHashtableEntry<mtClass>::next(); 779 } 780 781 const char* pkgname() { return _pkgname; } 782 void set_pkgname(char* pkgname) { _pkgname = pkgname; } 783 784 const char* filename() { 785 return ClassLoader::classpath_entry(_classpath_index)->name(); 786 } 787 788 void set_index(int index) { 789 _classpath_index = index; 790 } 791 }; 792 793 794 class PackageHashtable : public BasicHashtable<mtClass> { 795 private: 796 inline unsigned int compute_hash(const char *s, int n) { 797 unsigned int val = 0; 798 while (--n >= 0) { 799 val = *s++ + 31 * val; 800 } 801 return val; 802 } 803 804 PackageInfo* bucket(int index) { 805 return (PackageInfo*)BasicHashtable<mtClass>::bucket(index); 806 } 807 808 PackageInfo* get_entry(int index, unsigned int hash, 809 const char* pkgname, size_t n) { 810 for (PackageInfo* pp = bucket(index); pp != NULL; pp = pp->next()) { 811 if (pp->hash() == hash && 812 strncmp(pkgname, pp->pkgname(), n) == 0 && 813 pp->pkgname()[n] == '\0') { 814 return pp; 815 } 816 } 817 return NULL; 818 } 819 820 public: 821 PackageHashtable(int table_size) 822 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo)) {} 823 824 PackageHashtable(int table_size, HashtableBucket<mtClass>* t, int number_of_entries) 825 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo), t, number_of_entries) {} 826 827 PackageInfo* get_entry(const char* pkgname, int n) { 828 unsigned int hash = compute_hash(pkgname, n); 829 return get_entry(hash_to_index(hash), hash, pkgname, n); 830 } 831 832 PackageInfo* new_entry(char* pkgname, int n) { 833 unsigned int hash = compute_hash(pkgname, n); 834 PackageInfo* pp; 835 pp = (PackageInfo*)BasicHashtable<mtClass>::new_entry(hash); 836 pp->set_pkgname(pkgname); 837 return pp; 838 } 839 840 void add_entry(PackageInfo* pp) { 841 int index = hash_to_index(pp->hash()); 842 BasicHashtable<mtClass>::add_entry(index, pp); 843 } 844 845 void copy_pkgnames(const char** packages) { 846 int n = 0; 847 for (int i = 0; i < table_size(); ++i) { 848 for (PackageInfo* pp = bucket(i); pp != NULL; pp = pp->next()) { 849 packages[n++] = pp->pkgname(); 850 } 851 } 852 assert(n == number_of_entries(), "just checking"); 853 } 854 855 CDS_ONLY(void copy_table(char** top, char* end, PackageHashtable* table);) 856 }; 857 858 #if INCLUDE_CDS 859 void PackageHashtable::copy_table(char** top, char* end, 860 PackageHashtable* table) { 861 // Copy (relocate) the table to the shared space. 862 BasicHashtable<mtClass>::copy_table(top, end); 863 864 // Calculate the space needed for the package name strings. 865 int i; 866 intptr_t* tableSize = (intptr_t*)(*top); 867 *top += sizeof(intptr_t); // For table size 868 char* tableStart = *top; 869 870 for (i = 0; i < table_size(); ++i) { 871 for (PackageInfo* pp = table->bucket(i); 872 pp != NULL; 873 pp = pp->next()) { 874 int n1 = (int)(strlen(pp->pkgname()) + 1); 875 if (*top + n1 >= end) { 876 report_out_of_shared_space(SharedMiscData); 877 } 878 pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1)); 879 *top += n1; 880 } 881 } 882 *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord)); 883 if (*top >= end) { 884 report_out_of_shared_space(SharedMiscData); 885 } 886 887 // Write table size 888 intptr_t len = *top - (char*)tableStart; 889 *tableSize = len; 890 } 891 892 893 void ClassLoader::copy_package_info_buckets(char** top, char* end) { 894 _package_hash_table->copy_buckets(top, end); 895 } 896 897 void ClassLoader::copy_package_info_table(char** top, char* end) { 898 _package_hash_table->copy_table(top, end, _package_hash_table); 899 } 900 #endif 901 902 PackageInfo* ClassLoader::lookup_package(const char *pkgname) { 903 const char *cp = strrchr(pkgname, '/'); 904 if (cp != NULL) { 905 // Package prefix found 906 int n = cp - pkgname + 1; 907 return _package_hash_table->get_entry(pkgname, n); 908 } 909 return NULL; 910 } 911 912 913 bool ClassLoader::add_package(const char *pkgname, int classpath_index, TRAPS) { 914 assert(pkgname != NULL, "just checking"); 915 // Bootstrap loader no longer holds system loader lock obj serializing 916 // load_instance_class and thereby add_package 917 { 918 MutexLocker ml(PackageTable_lock, THREAD); 919 // First check for previously loaded entry 920 PackageInfo* pp = lookup_package(pkgname); 921 if (pp != NULL) { 922 // Existing entry found, check source of package 923 pp->set_index(classpath_index); 924 return true; 925 } 926 927 const char *cp = strrchr(pkgname, '/'); 928 if (cp != NULL) { 929 // Package prefix found 930 int n = cp - pkgname + 1; 931 932 char* new_pkgname = NEW_C_HEAP_ARRAY(char, n + 1, mtClass); 933 if (new_pkgname == NULL) { 934 return false; 935 } 936 937 memcpy(new_pkgname, pkgname, n); 938 new_pkgname[n] = '\0'; 939 pp = _package_hash_table->new_entry(new_pkgname, n); 940 pp->set_index(classpath_index); 941 942 // Insert into hash table 943 _package_hash_table->add_entry(pp); 944 } 945 return true; 946 } 947 } 948 949 950 oop ClassLoader::get_system_package(const char* name, TRAPS) { 951 PackageInfo* pp; 952 { 953 MutexLocker ml(PackageTable_lock, THREAD); 954 pp = lookup_package(name); 955 } 956 if (pp == NULL) { 957 return NULL; 958 } else { 959 Handle p = java_lang_String::create_from_str(pp->filename(), THREAD); 960 return p(); 961 } 962 } 963 964 965 objArrayOop ClassLoader::get_system_packages(TRAPS) { 966 ResourceMark rm(THREAD); 967 int nof_entries; 968 const char** packages; 969 { 970 MutexLocker ml(PackageTable_lock, THREAD); 971 // Allocate resource char* array containing package names 972 nof_entries = _package_hash_table->number_of_entries(); 973 if ((packages = NEW_RESOURCE_ARRAY(const char*, nof_entries)) == NULL) { 974 return NULL; 975 } 976 _package_hash_table->copy_pkgnames(packages); 977 } 978 // Allocate objArray and fill with java.lang.String 979 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), 980 nof_entries, CHECK_0); 981 objArrayHandle result(THREAD, r); 982 for (int i = 0; i < nof_entries; i++) { 983 Handle str = java_lang_String::create_from_str(packages[i], CHECK_0); 984 result->obj_at_put(i, str()); 985 } 986 987 return result(); 988 } 989 990 991 instanceKlassHandle ClassLoader::load_classfile(Symbol* h_name, TRAPS) { 992 ResourceMark rm(THREAD); 993 const char* class_name = h_name->as_C_string(); 994 EventMark m("loading class %s", class_name); 995 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion); 996 997 stringStream st; 998 // st.print() uses too much stack space while handling a StackOverflowError 999 // st.print("%s.class", h_name->as_utf8()); 1000 st.print_raw(h_name->as_utf8()); 1001 st.print_raw(".class"); 1002 const char* file_name = st.as_string(); 1003 ClassLoaderExt::Context context(class_name, file_name, THREAD); 1004 1005 // Lookup stream for parsing .class file 1006 ClassFileStream* stream = NULL; 1007 int classpath_index = 0; 1008 ClassPathEntry* e = NULL; 1009 instanceKlassHandle h; 1010 { 1011 PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(), 1012 ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(), 1013 PerfClassTraceTime::CLASS_LOAD); 1014 e = _first_entry; 1015 while (e != NULL) { 1016 stream = e->open_stream(file_name, CHECK_NULL); 1017 if (!context.check(stream, classpath_index)) { 1018 return h; // NULL 1019 } 1020 if (stream != NULL) { 1021 break; 1022 } 1023 e = e->next(); 1024 ++classpath_index; 1025 } 1026 } 1027 1028 if (stream != NULL) { 1029 // class file found, parse it 1030 ClassFileParser parser(stream); 1031 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 1032 Handle protection_domain; 1033 TempNewSymbol parsed_name = NULL; 1034 instanceKlassHandle result = parser.parseClassFile(h_name, 1035 loader_data, 1036 protection_domain, 1037 parsed_name, 1038 context.should_verify(classpath_index), 1039 THREAD); 1040 if (HAS_PENDING_EXCEPTION) { 1041 ResourceMark rm; 1042 if (DumpSharedSpaces) { 1043 tty->print_cr("Preload Error: Failed to load %s", class_name); 1044 } 1045 return h; 1046 } 1047 h = context.record_result(classpath_index, e, result, THREAD); 1048 } else { 1049 if (DumpSharedSpaces) { 1050 tty->print_cr("Preload Warning: Cannot find %s", class_name); 1051 } 1052 } 1053 1054 return h; 1055 } 1056 1057 1058 void ClassLoader::create_package_info_table(HashtableBucket<mtClass> *t, int length, 1059 int number_of_entries) { 1060 assert(_package_hash_table == NULL, "One package info table allowed."); 1061 assert(length == package_hash_table_size * sizeof(HashtableBucket<mtClass>), 1062 "bad shared package info size."); 1063 _package_hash_table = new PackageHashtable(package_hash_table_size, t, 1064 number_of_entries); 1065 } 1066 1067 1068 void ClassLoader::create_package_info_table() { 1069 assert(_package_hash_table == NULL, "shouldn't have one yet"); 1070 _package_hash_table = new PackageHashtable(package_hash_table_size); 1071 } 1072 1073 1074 // Initialize the class loader's access to methods in libzip. Parse and 1075 // process the boot classpath into a list ClassPathEntry objects. Once 1076 // this list has been created, it must not change order (see class PackageInfo) 1077 // it can be appended to and is by jvmti and the kernel vm. 1078 1079 void ClassLoader::initialize() { 1080 assert(_package_hash_table == NULL, "should have been initialized by now."); 1081 EXCEPTION_MARK; 1082 1083 if (UsePerfData) { 1084 // jvmstat performance counters 1085 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time"); 1086 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime"); 1087 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self"); 1088 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime"); 1089 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self"); 1090 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime"); 1091 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self"); 1092 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses"); 1093 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses"); 1094 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses"); 1095 1096 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime"); 1097 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self"); 1098 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime"); 1099 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime"); 1100 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime"); 1101 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime"); 1102 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self"); 1103 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount"); 1104 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses"); 1105 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime"); 1106 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self"); 1107 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes"); 1108 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes"); 1109 1110 1111 // The following performance counters are added for measuring the impact 1112 // of the bug fix of 6365597. They are mainly focused on finding out 1113 // the behavior of system & user-defined classloader lock, whether 1114 // ClassLoader.loadClass/findClass is being called synchronized or not. 1115 // Also two additional counters are created to see whether 'UnsyncloadClass' 1116 // flag is being set or not and how many times load_instance_class call 1117 // fails with linkageError etc. 1118 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS, 1119 "systemLoaderLockContentionRate"); 1120 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS, 1121 "nonSystemLoaderLockContentionRate"); 1122 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS, 1123 "jvmFindLoadedClassNoLockCalls"); 1124 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS, 1125 "jvmDefineClassNoLockCalls"); 1126 1127 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS, 1128 "jniDefineClassNoLockCalls"); 1129 1130 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, 1131 "unsafeDefineClassCalls"); 1132 1133 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet"); 1134 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS, 1135 "loadInstanceClassFailRate"); 1136 1137 // increment the isUnsyncloadClass counter if UnsyncloadClass is set. 1138 if (UnsyncloadClass) { 1139 _isUnsyncloadClass->inc(); 1140 } 1141 } 1142 1143 // lookup zip library entry points 1144 load_zip_library(); 1145 #if INCLUDE_CDS 1146 // initialize search path 1147 if (DumpSharedSpaces) { 1148 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info(); 1149 } 1150 #endif 1151 setup_bootstrap_search_path(); 1152 } 1153 1154 #if INCLUDE_CDS 1155 void ClassLoader::initialize_shared_path() { 1156 if (DumpSharedSpaces) { 1157 ClassLoaderExt::setup_search_paths(); 1158 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check() 1159 } 1160 } 1161 #endif 1162 1163 jlong ClassLoader::classloader_time_ms() { 1164 return UsePerfData ? 1165 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1; 1166 } 1167 1168 jlong ClassLoader::class_init_count() { 1169 return UsePerfData ? _perf_classes_inited->get_value() : -1; 1170 } 1171 1172 jlong ClassLoader::class_init_time_ms() { 1173 return UsePerfData ? 1174 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1; 1175 } 1176 1177 jlong ClassLoader::class_verify_time_ms() { 1178 return UsePerfData ? 1179 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1; 1180 } 1181 1182 jlong ClassLoader::class_link_count() { 1183 return UsePerfData ? _perf_classes_linked->get_value() : -1; 1184 } 1185 1186 jlong ClassLoader::class_link_time_ms() { 1187 return UsePerfData ? 1188 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1; 1189 } 1190 1191 int ClassLoader::compute_Object_vtable() { 1192 // hardwired for JDK1.2 -- would need to duplicate class file parsing 1193 // code to determine actual value from file 1194 // Would be value '11' if finals were in vtable 1195 int JDK_1_2_Object_vtable_size = 5; 1196 return JDK_1_2_Object_vtable_size * vtableEntry::size(); 1197 } 1198 1199 1200 void classLoader_init() { 1201 ClassLoader::initialize(); 1202 } 1203 1204 1205 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) { 1206 assert(orig != NULL && out != NULL && len > 0, "bad arguments"); 1207 if (CanonicalizeEntry != NULL) { 1208 JavaThread* THREAD = JavaThread::current(); 1209 JNIEnv* env = THREAD->jni_environment(); 1210 ResourceMark rm(THREAD); 1211 1212 // os::native_path writes into orig_copy 1213 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1); 1214 strcpy(orig_copy, orig); 1215 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) { 1216 return false; 1217 } 1218 } else { 1219 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing 1220 strncpy(out, orig, len); 1221 out[len - 1] = '\0'; 1222 } 1223 return true; 1224 } 1225 1226 #ifndef PRODUCT 1227 1228 void ClassLoader::verify() { 1229 _package_hash_table->verify(); 1230 } 1231 1232 1233 // CompileTheWorld 1234 // 1235 // Iterates over all class path entries and forces compilation of all methods 1236 // in all classes found. Currently, only zip/jar archives are searched. 1237 // 1238 // The classes are loaded by the Java level bootstrap class loader, and the 1239 // initializer is called. If DelayCompilationDuringStartup is true (default), 1240 // the interpreter will run the initialization code. Note that forcing 1241 // initialization in this way could potentially lead to initialization order 1242 // problems, in which case we could just force the initialization bit to be set. 1243 1244 1245 // We need to iterate over the contents of a zip/jar file, so we replicate the 1246 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile, 1247 // since jzfile already has a void* definition. 1248 // 1249 // Note that this is only used in debug mode. 1250 // 1251 // HotSpot integration note: 1252 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build 1253 1254 1255 // JDK 1.3 version 1256 typedef struct real_jzentry { /* Zip file entry */ 1257 char *name; /* entry name */ 1258 jint time; /* modification time */ 1259 jint size; /* size of uncompressed data */ 1260 jint csize; /* size of compressed data (zero if uncompressed) */ 1261 jint crc; /* crc of uncompressed data */ 1262 char *comment; /* optional zip file comment */ 1263 jbyte *extra; /* optional extra data */ 1264 jint pos; /* position of LOC header (if negative) or data */ 1265 } real_jzentry; 1266 1267 typedef struct real_jzfile { /* Zip file */ 1268 char *name; /* zip file name */ 1269 jint refs; /* number of active references */ 1270 jint fd; /* open file descriptor */ 1271 void *lock; /* read lock */ 1272 char *comment; /* zip file comment */ 1273 char *msg; /* zip error message */ 1274 void *entries; /* array of hash cells */ 1275 jint total; /* total number of entries */ 1276 unsigned short *table; /* Hash chain heads: indexes into entries */ 1277 jint tablelen; /* number of hash eads */ 1278 real_jzfile *next; /* next zip file in search list */ 1279 jzentry *cache; /* we cache the most recently freed jzentry */ 1280 /* Information on metadata names in META-INF directory */ 1281 char **metanames; /* array of meta names (may have null names) */ 1282 jint metacount; /* number of slots in metanames array */ 1283 /* If there are any per-entry comments, they are in the comments array */ 1284 char **comments; 1285 } real_jzfile; 1286 1287 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) { 1288 // For now we only compile all methods in all classes in zip/jar files 1289 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir); 1290 tty->cr(); 1291 } 1292 1293 bool ClassPathDirEntry::is_jrt() { 1294 return false; 1295 } 1296 1297 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) { 1298 real_jzfile* zip = (real_jzfile*) _zip; 1299 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name); 1300 tty->cr(); 1301 // Iterate over all entries in zip file 1302 for (int n = 0; ; n++) { 1303 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n)); 1304 if (ze == NULL) break; 1305 ClassLoader::compile_the_world_in(ze->name, loader, CHECK); 1306 } 1307 if (HAS_PENDING_EXCEPTION) { 1308 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1309 CLEAR_PENDING_EXCEPTION; 1310 tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); 1311 tty->print_cr("Increase class metadata storage if a limit was set"); 1312 } else { 1313 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); 1314 } 1315 } 1316 } 1317 1318 bool ClassPathZipEntry::is_jrt() { 1319 return false; 1320 } 1321 1322 void LazyClassPathEntry::compile_the_world(Handle loader, TRAPS) { 1323 ClassPathEntry* cpe = resolve_entry(THREAD); 1324 if (cpe != NULL) { 1325 cpe->compile_the_world(loader, CHECK); 1326 } 1327 } 1328 1329 bool LazyClassPathEntry::is_jrt() { 1330 Thread* THREAD = Thread::current(); 1331 ClassPathEntry* cpe = resolve_entry(THREAD); 1332 return (cpe != NULL) ? cpe->is_jar_file() : false; 1333 } 1334 1335 void ClassLoader::compile_the_world() { 1336 EXCEPTION_MARK; 1337 HandleMark hm(THREAD); 1338 ResourceMark rm(THREAD); 1339 // Make sure we don't run with background compilation 1340 BackgroundCompilation = false; 1341 // Find bootstrap loader 1342 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader()); 1343 // Iterate over all bootstrap class path entries 1344 ClassPathEntry* e = _first_entry; 1345 jlong start = os::javaTimeMillis(); 1346 while (e != NULL) { 1347 // We stop at bootmodules.jimage, unless it is the first bootstrap path entry 1348 if (e->is_jrt() && e != _first_entry) break; 1349 e->compile_the_world(system_class_loader, CATCH); 1350 e = e->next(); 1351 } 1352 jlong end = os::javaTimeMillis(); 1353 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)", 1354 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start)); 1355 { 1356 // Print statistics as if before normal exit: 1357 extern void print_statistics(); 1358 print_statistics(); 1359 } 1360 vm_exit(0); 1361 } 1362 1363 int ClassLoader::_compile_the_world_class_counter = 0; 1364 int ClassLoader::_compile_the_world_method_counter = 0; 1365 static int _codecache_sweep_counter = 0; 1366 1367 // Filter out all exceptions except OOMs 1368 static void clear_pending_exception_if_not_oom(TRAPS) { 1369 if (HAS_PENDING_EXCEPTION && 1370 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1371 CLEAR_PENDING_EXCEPTION; 1372 } 1373 // The CHECK at the caller will propagate the exception out 1374 } 1375 1376 /** 1377 * Returns if the given method should be compiled when doing compile-the-world. 1378 * 1379 * TODO: This should be a private method in a CompileTheWorld class. 1380 */ 1381 static bool can_be_compiled(methodHandle m, int comp_level) { 1382 assert(CompileTheWorld, "must be"); 1383 1384 // It's not valid to compile a native wrapper for MethodHandle methods 1385 // that take a MemberName appendix since the bytecode signature is not 1386 // correct. 1387 vmIntrinsics::ID iid = m->intrinsic_id(); 1388 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) { 1389 return false; 1390 } 1391 1392 return CompilationPolicy::can_be_compiled(m, comp_level); 1393 } 1394 1395 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) { 1396 if (string_ends_with(name, ".class")) { 1397 // We have a .class file 1398 int len = (int)strlen(name); 1399 char buffer[2048]; 1400 strncpy(buffer, name, len - 6); 1401 buffer[len-6] = 0; 1402 // If the file has a period after removing .class, it's not really a 1403 // valid class file. The class loader will check everything else. 1404 if (strchr(buffer, '.') == NULL) { 1405 _compile_the_world_class_counter++; 1406 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return; 1407 1408 // Construct name without extension 1409 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK); 1410 // Use loader to load and initialize class 1411 Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD); 1412 instanceKlassHandle k (THREAD, ik); 1413 if (k.not_null() && !HAS_PENDING_EXCEPTION) { 1414 k->initialize(THREAD); 1415 } 1416 bool exception_occurred = HAS_PENDING_EXCEPTION; 1417 clear_pending_exception_if_not_oom(CHECK); 1418 if (CompileTheWorldPreloadClasses && k.not_null()) { 1419 ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD); 1420 if (HAS_PENDING_EXCEPTION) { 1421 // If something went wrong in preloading we just ignore it 1422 clear_pending_exception_if_not_oom(CHECK); 1423 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer); 1424 } 1425 } 1426 1427 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) { 1428 if (k.is_null() || exception_occurred) { 1429 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class 1430 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer); 1431 } else { 1432 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer); 1433 // Preload all classes to get around uncommon traps 1434 // Iterate over all methods in class 1435 int comp_level = CompilationPolicy::policy()->initial_compile_level(); 1436 for (int n = 0; n < k->methods()->length(); n++) { 1437 methodHandle m (THREAD, k->methods()->at(n)); 1438 if (can_be_compiled(m, comp_level)) { 1439 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) { 1440 // Give sweeper a chance to keep up with CTW 1441 VM_ForceSafepoint op; 1442 VMThread::execute(&op); 1443 _codecache_sweep_counter = 0; 1444 } 1445 // Force compilation 1446 CompileBroker::compile_method(m, InvocationEntryBci, comp_level, 1447 methodHandle(), 0, "CTW", THREAD); 1448 if (HAS_PENDING_EXCEPTION) { 1449 clear_pending_exception_if_not_oom(CHECK); 1450 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1451 } else { 1452 _compile_the_world_method_counter++; 1453 } 1454 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) { 1455 // Clobber the first compile and force second tier compilation 1456 nmethod* nm = m->code(); 1457 if (nm != NULL && !m->is_method_handle_intrinsic()) { 1458 // Throw out the code so that the code cache doesn't fill up 1459 nm->make_not_entrant(); 1460 m->clear_code(); 1461 } 1462 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization, 1463 methodHandle(), 0, "CTW", THREAD); 1464 if (HAS_PENDING_EXCEPTION) { 1465 clear_pending_exception_if_not_oom(CHECK); 1466 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1467 } else { 1468 _compile_the_world_method_counter++; 1469 } 1470 } 1471 } else { 1472 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1473 } 1474 1475 nmethod* nm = m->code(); 1476 if (nm != NULL && !m->is_method_handle_intrinsic()) { 1477 // Throw out the code so that the code cache doesn't fill up 1478 nm->make_not_entrant(); 1479 m->clear_code(); 1480 } 1481 } 1482 } 1483 } 1484 } 1485 } 1486 } 1487 1488 #endif //PRODUCT 1489 1490 // Please keep following two functions at end of this file. With them placed at top or in middle of the file, 1491 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589. 1492 void PerfClassTraceTime::initialize() { 1493 if (!UsePerfData) return; 1494 1495 if (_eventp != NULL) { 1496 // increment the event counter 1497 _eventp->inc(); 1498 } 1499 1500 // stop the current active thread-local timer to measure inclusive time 1501 _prev_active_event = -1; 1502 for (int i=0; i < EVENT_TYPE_COUNT; i++) { 1503 if (_timers[i].is_active()) { 1504 assert(_prev_active_event == -1, "should have only one active timer"); 1505 _prev_active_event = i; 1506 _timers[i].stop(); 1507 } 1508 } 1509 1510 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) { 1511 // start the inclusive timer if not recursively called 1512 _t.start(); 1513 } 1514 1515 // start thread-local timer of the given event type 1516 if (!_timers[_event_type].is_active()) { 1517 _timers[_event_type].start(); 1518 } 1519 } 1520 1521 PerfClassTraceTime::~PerfClassTraceTime() { 1522 if (!UsePerfData) return; 1523 1524 // stop the thread-local timer as the event completes 1525 // and resume the thread-local timer of the event next on the stack 1526 _timers[_event_type].stop(); 1527 jlong selftime = _timers[_event_type].ticks(); 1528 1529 if (_prev_active_event >= 0) { 1530 _timers[_prev_active_event].start(); 1531 } 1532 1533 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return; 1534 1535 // increment the counters only on the leaf call 1536 _t.stop(); 1537 _timep->inc(_t.ticks()); 1538 if (_selftimep != NULL) { 1539 _selftimep->inc(selftime); 1540 } 1541 // add all class loading related event selftime to the accumulated time counter 1542 ClassLoader::perf_accumulated_time()->inc(selftime); 1543 1544 // reset the timer 1545 _timers[_event_type].reset(); 1546 }