1 /* 2 * Copyright (c) 1997, 2014, 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/javaClasses.hpp" 32 #if INCLUDE_CDS 33 #include "classfile/sharedPathsMiscInfo.hpp" 34 #include "classfile/sharedClassUtil.hpp" 35 #endif 36 #include "classfile/systemDictionary.hpp" 37 #include "classfile/vmSymbols.hpp" 38 #include "compiler/compileBroker.hpp" 39 #include "gc_interface/collectedHeap.inline.hpp" 40 #include "interpreter/bytecodeStream.hpp" 41 #include "interpreter/oopMapCache.hpp" 42 #include "memory/allocation.inline.hpp" 43 #include "memory/filemap.hpp" 44 #include "memory/generation.hpp" 45 #include "memory/oopFactory.hpp" 46 #include "memory/universe.inline.hpp" 47 #include "oops/instanceKlass.hpp" 48 #include "oops/instanceRefKlass.hpp" 49 #include "oops/oop.inline.hpp" 50 #include "oops/symbol.hpp" 51 #include "prims/jvm_misc.hpp" 52 #include "runtime/arguments.hpp" 53 #include "runtime/compilationPolicy.hpp" 54 #include "runtime/fprofiler.hpp" 55 #include "runtime/handles.hpp" 56 #include "runtime/handles.inline.hpp" 57 #include "runtime/init.hpp" 58 #include "runtime/interfaceSupport.hpp" 59 #include "runtime/java.hpp" 60 #include "runtime/javaCalls.hpp" 61 #include "runtime/threadCritical.hpp" 62 #include "runtime/timer.hpp" 63 #include "services/management.hpp" 64 #include "services/threadService.hpp" 65 #include "utilities/events.hpp" 66 #include "utilities/hashtable.hpp" 67 #include "utilities/hashtable.inline.hpp" 68 #ifdef TARGET_OS_FAMILY_linux 69 # include "os_linux.inline.hpp" 70 #endif 71 #ifdef TARGET_OS_FAMILY_solaris 72 # include "os_solaris.inline.hpp" 73 #endif 74 #ifdef TARGET_OS_FAMILY_windows 75 # include "os_windows.inline.hpp" 76 #endif 77 #ifdef TARGET_OS_FAMILY_aix 78 # include "os_aix.inline.hpp" 79 #endif 80 #ifdef TARGET_OS_FAMILY_bsd 81 # include "os_bsd.inline.hpp" 82 #endif 83 84 85 // Entry points in zip.dll for loading zip/jar file entries 86 87 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg); 88 typedef void (JNICALL *ZipClose_t)(jzfile *zip); 89 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen); 90 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf); 91 typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf); 92 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n); 93 typedef jint (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len); 94 95 static ZipOpen_t ZipOpen = NULL; 96 static ZipClose_t ZipClose = NULL; 97 static FindEntry_t FindEntry = NULL; 98 static ReadEntry_t ReadEntry = NULL; 99 static ReadMappedEntry_t ReadMappedEntry = NULL; 100 static GetNextEntry_t GetNextEntry = NULL; 101 static canonicalize_fn_t CanonicalizeEntry = NULL; 102 static Crc32_t Crc32 = NULL; 103 104 // Globals 105 106 PerfCounter* ClassLoader::_perf_accumulated_time = NULL; 107 PerfCounter* ClassLoader::_perf_classes_inited = NULL; 108 PerfCounter* ClassLoader::_perf_class_init_time = NULL; 109 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL; 110 PerfCounter* ClassLoader::_perf_classes_verified = NULL; 111 PerfCounter* ClassLoader::_perf_class_verify_time = NULL; 112 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL; 113 PerfCounter* ClassLoader::_perf_classes_linked = NULL; 114 PerfCounter* ClassLoader::_perf_class_link_time = NULL; 115 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL; 116 PerfCounter* ClassLoader::_perf_class_parse_time = NULL; 117 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL; 118 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL; 119 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL; 120 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL; 121 PerfCounter* ClassLoader::_perf_app_classload_time = NULL; 122 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL; 123 PerfCounter* ClassLoader::_perf_app_classload_count = NULL; 124 PerfCounter* ClassLoader::_perf_define_appclasses = NULL; 125 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL; 126 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL; 127 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL; 128 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL; 129 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL; 130 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL; 131 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL; 132 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL; 133 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL; 134 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL; 135 PerfCounter* ClassLoader::_isUnsyncloadClass = NULL; 136 PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL; 137 138 ClassPathEntry* ClassLoader::_first_entry = NULL; 139 ClassPathEntry* ClassLoader::_last_entry = NULL; 140 int ClassLoader::_num_entries = 0; 141 PackageHashtable* ClassLoader::_package_hash_table = NULL; 142 143 #if INCLUDE_CDS 144 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL; 145 #endif 146 // helper routines 147 bool string_starts_with(const char* str, const char* str_to_find) { 148 size_t str_len = strlen(str); 149 size_t str_to_find_len = strlen(str_to_find); 150 if (str_to_find_len > str_len) { 151 return false; 152 } 153 return (strncmp(str, str_to_find, str_to_find_len) == 0); 154 } 155 156 bool string_ends_with(const char* str, const char* str_to_find) { 157 size_t str_len = strlen(str); 158 size_t str_to_find_len = strlen(str_to_find); 159 if (str_to_find_len > str_len) { 160 return false; 161 } 162 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0); 163 } 164 165 166 MetaIndex::MetaIndex(char** meta_package_names, int num_meta_package_names) { 167 if (num_meta_package_names == 0) { 168 _meta_package_names = NULL; 169 _num_meta_package_names = 0; 170 } else { 171 _meta_package_names = NEW_C_HEAP_ARRAY(char*, num_meta_package_names, mtClass); 172 _num_meta_package_names = num_meta_package_names; 173 memcpy(_meta_package_names, meta_package_names, num_meta_package_names * sizeof(char*)); 174 } 175 } 176 177 178 MetaIndex::~MetaIndex() { 179 FREE_C_HEAP_ARRAY(char*, _meta_package_names, mtClass); 180 } 181 182 183 bool MetaIndex::may_contain(const char* class_name) { 184 if ( _num_meta_package_names == 0) { 185 return false; 186 } 187 size_t class_name_len = strlen(class_name); 188 for (int i = 0; i < _num_meta_package_names; i++) { 189 char* pkg = _meta_package_names[i]; 190 size_t pkg_len = strlen(pkg); 191 size_t min_len = MIN2(class_name_len, pkg_len); 192 if (!strncmp(class_name, pkg, min_len)) { 193 return true; 194 } 195 } 196 return false; 197 } 198 199 200 ClassPathEntry::ClassPathEntry() { 201 set_next(NULL); 202 } 203 204 205 bool ClassPathEntry::is_lazy() { 206 return false; 207 } 208 209 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() { 210 char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass); 211 strcpy(copy, dir); 212 _dir = copy; 213 } 214 215 216 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) { 217 // construct full path name 218 char path[JVM_MAXPATHLEN]; 219 if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) { 220 return NULL; 221 } 222 // check if file exists 223 struct stat st; 224 if (os::stat(path, &st) == 0) { 225 #if INCLUDE_CDS 226 if (DumpSharedSpaces) { 227 // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so 228 // we should never find a file underneath it -- unless user has added a new file while we are running 229 // the dump, in which case let's quit! 230 ShouldNotReachHere(); 231 } 232 #endif 233 // found file, open it 234 int file_handle = os::open(path, 0, 0); 235 if (file_handle != -1) { 236 // read contents into resource array 237 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size); 238 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size); 239 // close file 240 os::close(file_handle); 241 // construct ClassFileStream 242 if (num_read == (size_t)st.st_size) { 243 if (UsePerfData) { 244 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read); 245 } 246 return new ClassFileStream(buffer, st.st_size, _dir); // Resource allocated 247 } 248 } 249 } 250 return NULL; 251 } 252 253 254 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() { 255 _zip = zip; 256 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass); 257 strcpy(copy, zip_name); 258 _zip_name = copy; 259 } 260 261 ClassPathZipEntry::~ClassPathZipEntry() { 262 if (ZipClose != NULL) { 263 (*ZipClose)(_zip); 264 } 265 FREE_C_HEAP_ARRAY(char, _zip_name, mtClass); 266 } 267 268 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) { 269 // enable call to C land 270 JavaThread* thread = JavaThread::current(); 271 ThreadToNativeFromVM ttn(thread); 272 // check whether zip archive contains name 273 jint name_len; 274 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len); 275 if (entry == NULL) return NULL; 276 u1* buffer; 277 char name_buf[128]; 278 char* filename; 279 if (name_len < 128) { 280 filename = name_buf; 281 } else { 282 filename = NEW_RESOURCE_ARRAY(char, name_len + 1); 283 } 284 285 // file found, get pointer to the entry in mmapped jar file. 286 if (ReadMappedEntry == NULL || 287 !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) { 288 // mmapped access not available, perhaps due to compression, 289 // read contents into resource array 290 int size = (*filesize) + ((nul_terminate) ? 1 : 0); 291 buffer = NEW_RESOURCE_ARRAY(u1, size); 292 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL; 293 } 294 295 // return result 296 if (nul_terminate) { 297 buffer[*filesize] = 0; 298 } 299 return buffer; 300 } 301 302 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) { 303 jint filesize; 304 u1* buffer = open_entry(name, &filesize, false, CHECK_NULL); 305 if (buffer == NULL) { 306 return NULL; 307 } 308 if (UsePerfData) { 309 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize); 310 } 311 return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated 312 } 313 314 // invoke function for each entry in the zip file 315 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) { 316 JavaThread* thread = JavaThread::current(); 317 HandleMark handle_mark(thread); 318 ThreadToNativeFromVM ttn(thread); 319 for (int n = 0; ; n++) { 320 jzentry * ze = ((*GetNextEntry)(_zip, n)); 321 if (ze == NULL) break; 322 (*f)(ze->name, context); 323 } 324 } 325 326 LazyClassPathEntry::LazyClassPathEntry(const char* path, const struct stat* st, bool throw_exception) : ClassPathEntry() { 327 _path = strdup(path); 328 _st = *st; 329 _meta_index = NULL; 330 _resolved_entry = NULL; 331 _has_error = false; 332 _throw_exception = throw_exception; 333 } 334 335 bool LazyClassPathEntry::is_jar_file() { 336 return ((_st.st_mode & S_IFREG) == S_IFREG); 337 } 338 339 ClassPathEntry* LazyClassPathEntry::resolve_entry(TRAPS) { 340 if (_resolved_entry != NULL) { 341 return (ClassPathEntry*) _resolved_entry; 342 } 343 ClassPathEntry* new_entry = NULL; 344 new_entry = ClassLoader::create_class_path_entry(_path, &_st, false, _throw_exception, CHECK_NULL); 345 if (!_throw_exception && new_entry == NULL) { 346 assert(!HAS_PENDING_EXCEPTION, "must be"); 347 return NULL; 348 } 349 { 350 ThreadCritical tc; 351 if (_resolved_entry == NULL) { 352 _resolved_entry = new_entry; 353 return new_entry; 354 } 355 } 356 assert(_resolved_entry != NULL, "bug in MT-safe resolution logic"); 357 delete new_entry; 358 return (ClassPathEntry*) _resolved_entry; 359 } 360 361 ClassFileStream* LazyClassPathEntry::open_stream(const char* name, TRAPS) { 362 if (_meta_index != NULL && 363 !_meta_index->may_contain(name)) { 364 return NULL; 365 } 366 if (_has_error) { 367 return NULL; 368 } 369 ClassPathEntry* cpe = resolve_entry(THREAD); 370 if (cpe == NULL) { 371 _has_error = true; 372 return NULL; 373 } else { 374 return cpe->open_stream(name, THREAD); 375 } 376 } 377 378 bool LazyClassPathEntry::is_lazy() { 379 return true; 380 } 381 382 u1* LazyClassPathEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) { 383 if (_has_error) { 384 return NULL; 385 } 386 ClassPathEntry* cpe = resolve_entry(THREAD); 387 if (cpe == NULL) { 388 _has_error = true; 389 return NULL; 390 } else if (cpe->is_jar_file()) { 391 return ((ClassPathZipEntry*)cpe)->open_entry(name, filesize, nul_terminate,THREAD); 392 } else { 393 ShouldNotReachHere(); 394 *filesize = 0; 395 return NULL; 396 } 397 } 398 399 static void print_meta_index(LazyClassPathEntry* entry, 400 GrowableArray<char*>& meta_packages) { 401 tty->print("[Meta index for %s=", entry->name()); 402 for (int i = 0; i < meta_packages.length(); i++) { 403 if (i > 0) tty->print(" "); 404 tty->print("%s", meta_packages.at(i)); 405 } 406 tty->print_cr("]"); 407 } 408 409 #if INCLUDE_CDS 410 void ClassLoader::exit_with_path_failure(const char* error, const char* message) { 411 assert(DumpSharedSpaces, "only called at dump time"); 412 tty->print_cr("Hint: enable -XX:+TraceClassPaths to diagnose the failure"); 413 vm_exit_during_initialization(error, message); 414 } 415 #endif 416 417 void ClassLoader::trace_class_path(outputStream* out, const char* msg, const char* name) { 418 if (!TraceClassPaths) { 419 return; 420 } 421 422 if (msg) { 423 out->print("%s", msg); 424 } 425 if (name) { 426 if (strlen(name) < 256) { 427 out->print("%s", name); 428 } else { 429 // For very long paths, we need to print each character separately, 430 // as print_cr() has a length limit 431 while (name[0] != '\0') { 432 out->print("%c", name[0]); 433 name++; 434 } 435 } 436 } 437 if (msg && msg[0] == '[') { 438 out->print_cr("]"); 439 } else { 440 out->cr(); 441 } 442 } 443 444 void ClassLoader::setup_bootstrap_meta_index() { 445 // Set up meta index which allows us to open boot jars lazily if 446 // class data sharing is enabled 447 const char* meta_index_path = Arguments::get_meta_index_path(); 448 const char* meta_index_dir = Arguments::get_meta_index_dir(); 449 setup_meta_index(meta_index_path, meta_index_dir, 0); 450 } 451 452 void ClassLoader::setup_meta_index(const char* meta_index_path, const char* meta_index_dir, int start_index) { 453 const char* known_version = "% VERSION 2"; 454 FILE* file = fopen(meta_index_path, "r"); 455 int line_no = 0; 456 #if INCLUDE_CDS 457 if (DumpSharedSpaces) { 458 if (file != NULL) { 459 _shared_paths_misc_info->add_required_file(meta_index_path); 460 } else { 461 _shared_paths_misc_info->add_nonexist_path(meta_index_path); 462 } 463 } 464 #endif 465 if (file != NULL) { 466 ResourceMark rm; 467 LazyClassPathEntry* cur_entry = NULL; 468 GrowableArray<char*> boot_class_path_packages(10); 469 char package_name[256]; 470 bool skipCurrentJar = false; 471 while (fgets(package_name, sizeof(package_name), file) != NULL) { 472 ++line_no; 473 // Remove trailing newline 474 package_name[strlen(package_name) - 1] = '\0'; 475 switch(package_name[0]) { 476 case '%': 477 { 478 if ((line_no == 1) && (strcmp(package_name, known_version) != 0)) { 479 if (TraceClassLoading && Verbose) { 480 tty->print("[Unsupported meta index version]"); 481 } 482 fclose(file); 483 return; 484 } 485 } 486 487 // These directives indicate jar files which contain only 488 // classes, only non-classfile resources, or a combination of 489 // the two. See src/share/classes/sun/misc/MetaIndex.java and 490 // make/tools/MetaIndex/BuildMetaIndex.java in the J2SE 491 // workspace. 492 case '#': 493 case '!': 494 case '@': 495 { 496 // Hand off current packages to current lazy entry (if any) 497 if ((cur_entry != NULL) && 498 (boot_class_path_packages.length() > 0)) { 499 if ((TraceClassLoading || TraceClassPaths) && Verbose) { 500 print_meta_index(cur_entry, boot_class_path_packages); 501 } 502 MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0), 503 boot_class_path_packages.length()); 504 cur_entry->set_meta_index(index); 505 } 506 cur_entry = NULL; 507 boot_class_path_packages.clear(); 508 509 // Find lazy entry corresponding to this jar file 510 int count = 0; 511 for (ClassPathEntry* entry = _first_entry; entry != NULL; entry = entry->next(), count++) { 512 if (count >= start_index && 513 entry->is_lazy() && 514 string_starts_with(entry->name(), meta_index_dir) && 515 string_ends_with(entry->name(), &package_name[2])) { 516 cur_entry = (LazyClassPathEntry*) entry; 517 break; 518 } 519 } 520 521 // If the first character is '@', it indicates the following jar 522 // file is a resource only jar file in which case, we should skip 523 // reading the subsequent entries since the resource loading is 524 // totally handled by J2SE side. 525 if (package_name[0] == '@') { 526 if (cur_entry != NULL) { 527 cur_entry->set_meta_index(new MetaIndex(NULL, 0)); 528 } 529 cur_entry = NULL; 530 skipCurrentJar = true; 531 } else { 532 skipCurrentJar = false; 533 } 534 535 break; 536 } 537 538 default: 539 { 540 if (!skipCurrentJar && cur_entry != NULL) { 541 char* new_name = strdup(package_name); 542 boot_class_path_packages.append(new_name); 543 } 544 } 545 } 546 } 547 // Hand off current packages to current lazy entry (if any) 548 if ((cur_entry != NULL) && 549 (boot_class_path_packages.length() > 0)) { 550 if ((TraceClassLoading || TraceClassPaths) && Verbose) { 551 print_meta_index(cur_entry, boot_class_path_packages); 552 } 553 MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0), 554 boot_class_path_packages.length()); 555 cur_entry->set_meta_index(index); 556 } 557 fclose(file); 558 } 559 } 560 561 #if INCLUDE_CDS 562 void ClassLoader::check_shared_classpath(const char *path) { 563 if (strcmp(path, "") == 0) { 564 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL); 565 } 566 567 struct stat st; 568 if (os::stat(path, &st) == 0) { 569 if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory 570 if (!os::dir_is_empty(path)) { 571 tty->print_cr("Error: non-empty directory '%s'", path); 572 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL); 573 } 574 } 575 } 576 } 577 #endif 578 579 void ClassLoader::setup_bootstrap_search_path() { 580 assert(_first_entry == NULL, "should not setup bootstrap class search path twice"); 581 const char* sys_class_path = Arguments::get_sysclasspath(); 582 if (PrintSharedArchiveAndExit) { 583 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily 584 // the same as the bootcp of the shared archive. 585 } else { 586 trace_class_path(tty, "[Bootstrap loader class path=", sys_class_path); 587 } 588 #if INCLUDE_CDS 589 if (DumpSharedSpaces) { 590 _shared_paths_misc_info->add_boot_classpath(sys_class_path); 591 } 592 #endif 593 setup_search_path(sys_class_path); 594 } 595 596 #if INCLUDE_CDS 597 int ClassLoader::get_shared_paths_misc_info_size() { 598 return _shared_paths_misc_info->get_used_bytes(); 599 } 600 601 void* ClassLoader::get_shared_paths_misc_info() { 602 return _shared_paths_misc_info->buffer(); 603 } 604 605 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) { 606 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size); 607 bool result = checker->check(); 608 delete checker; 609 return result; 610 } 611 #endif 612 613 void ClassLoader::setup_search_path(const char *class_path, bool canonicalize) { 614 int offset = 0; 615 int len = (int)strlen(class_path); 616 int end = 0; 617 618 // Iterate over class path entries 619 for (int start = 0; start < len; start = end) { 620 while (class_path[end] && class_path[end] != os::path_separator()[0]) { 621 end++; 622 } 623 EXCEPTION_MARK; 624 ResourceMark rm(THREAD); 625 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1); 626 strncpy(path, &class_path[start], end - start); 627 path[end - start] = '\0'; 628 if (canonicalize) { 629 char* canonical_path = NEW_RESOURCE_ARRAY(char, JVM_MAXPATHLEN + 1); 630 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 631 path = canonical_path; 632 } 633 } 634 update_class_path_entry_list(path, /*check_for_duplicates=*/canonicalize); 635 #if INCLUDE_CDS 636 if (DumpSharedSpaces) { 637 check_shared_classpath(path); 638 } 639 #endif 640 while (class_path[end] == os::path_separator()[0]) { 641 end++; 642 } 643 } 644 } 645 646 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st, 647 bool lazy, bool throw_exception, TRAPS) { 648 JavaThread* thread = JavaThread::current(); 649 if (lazy) { 650 return new LazyClassPathEntry(path, st, throw_exception); 651 } 652 ClassPathEntry* new_entry = NULL; 653 if ((st->st_mode & S_IFREG) == S_IFREG) { 654 // Regular file, should be a zip file 655 // Canonicalized filename 656 char canonical_path[JVM_MAXPATHLEN]; 657 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 658 // This matches the classic VM 659 if (throw_exception) { 660 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL); 661 } else { 662 return NULL; 663 } 664 } 665 char* error_msg = NULL; 666 jzfile* zip; 667 { 668 // enable call to C land 669 ThreadToNativeFromVM ttn(thread); 670 HandleMark hm(thread); 671 zip = (*ZipOpen)(canonical_path, &error_msg); 672 } 673 if (zip != NULL && error_msg == NULL) { 674 new_entry = new ClassPathZipEntry(zip, path); 675 if (TraceClassLoading || TraceClassPaths) { 676 tty->print_cr("[Opened %s]", path); 677 } 678 } else { 679 ResourceMark rm(thread); 680 char *msg; 681 if (error_msg == NULL) { 682 msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ; 683 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path); 684 } else { 685 int len = (int)(strlen(path) + strlen(error_msg) + 128); 686 msg = NEW_RESOURCE_ARRAY(char, len); ; 687 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path); 688 } 689 if (throw_exception) { 690 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL); 691 } else { 692 return NULL; 693 } 694 } 695 } else { 696 // Directory 697 new_entry = new ClassPathDirEntry(path); 698 if (TraceClassLoading || TraceClassPaths) { 699 tty->print_cr("[Path %s]", path); 700 } 701 } 702 return new_entry; 703 } 704 705 706 // Create a class path zip entry for a given path (return NULL if not found 707 // or zip/JAR file cannot be opened) 708 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) { 709 // check for a regular file 710 struct stat st; 711 if (os::stat(path, &st) == 0) { 712 if ((st.st_mode & S_IFREG) == S_IFREG) { 713 char canonical_path[JVM_MAXPATHLEN]; 714 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 715 char* error_msg = NULL; 716 jzfile* zip; 717 { 718 // enable call to C land 719 JavaThread* thread = JavaThread::current(); 720 ThreadToNativeFromVM ttn(thread); 721 HandleMark hm(thread); 722 zip = (*ZipOpen)(canonical_path, &error_msg); 723 } 724 if (zip != NULL && error_msg == NULL) { 725 // create using canonical path 726 return new ClassPathZipEntry(zip, canonical_path); 727 } 728 } 729 } 730 } 731 return NULL; 732 } 733 734 // returns true if entry already on class path 735 bool ClassLoader::contains_entry(ClassPathEntry *entry) { 736 ClassPathEntry* e = _first_entry; 737 while (e != NULL) { 738 // assume zip entries have been canonicalized 739 if (strcmp(entry->name(), e->name()) == 0) { 740 return true; 741 } 742 e = e->next(); 743 } 744 return false; 745 } 746 747 void ClassLoader::add_to_list(ClassPathEntry *new_entry) { 748 if (new_entry != NULL) { 749 if (_last_entry == NULL) { 750 _first_entry = _last_entry = new_entry; 751 } else { 752 _last_entry->set_next(new_entry); 753 _last_entry = new_entry; 754 } 755 } 756 _num_entries ++; 757 } 758 759 // Returns true IFF the file/dir exists and the entry was successfully created. 760 bool ClassLoader::update_class_path_entry_list(const char *path, 761 bool check_for_duplicates, 762 bool throw_exception) { 763 struct stat st; 764 if (os::stat(path, &st) == 0) { 765 // File or directory found 766 ClassPathEntry* new_entry = NULL; 767 Thread* THREAD = Thread::current(); 768 new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, throw_exception, CHECK_(false)); 769 if (new_entry == NULL) { 770 return false; 771 } 772 // The kernel VM adds dynamically to the end of the classloader path and 773 // doesn't reorder the bootclasspath which would break java.lang.Package 774 // (see PackageInfo). 775 // Add new entry to linked list 776 if (!check_for_duplicates || !contains_entry(new_entry)) { 777 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry); 778 } 779 return true; 780 } else { 781 #if INCLUDE_CDS 782 if (DumpSharedSpaces) { 783 _shared_paths_misc_info->add_nonexist_path(path); 784 } 785 #endif 786 return false; 787 } 788 } 789 790 void ClassLoader::print_bootclasspath() { 791 ClassPathEntry* e = _first_entry; 792 tty->print("[bootclasspath= "); 793 while (e != NULL) { 794 tty->print("%s ;", e->name()); 795 e = e->next(); 796 } 797 tty->print_cr("]"); 798 } 799 800 void ClassLoader::load_zip_library() { 801 assert(ZipOpen == NULL, "should not load zip library twice"); 802 // First make sure native library is loaded 803 os::native_java_library(); 804 // Load zip library 805 char path[JVM_MAXPATHLEN]; 806 char ebuf[1024]; 807 void* handle = NULL; 808 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) { 809 handle = os::dll_load(path, ebuf, sizeof ebuf); 810 } 811 if (handle == NULL) { 812 vm_exit_during_initialization("Unable to load ZIP library", path); 813 } 814 // Lookup zip entry points 815 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open")); 816 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close")); 817 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry")); 818 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry")); 819 ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry")); 820 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry")); 821 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32")); 822 823 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL 824 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL || 825 GetNextEntry == NULL || Crc32 == NULL) { 826 vm_exit_during_initialization("Corrupted ZIP library", path); 827 } 828 829 // Lookup canonicalize entry in libjava.dll 830 void *javalib_handle = os::native_java_library(); 831 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize")); 832 // This lookup only works on 1.3. Do not check for non-null here 833 } 834 835 int ClassLoader::crc32(int crc, const char* buf, int len) { 836 assert(Crc32 != NULL, "ZIP_CRC32 is not found"); 837 return (*Crc32)(crc, (const jbyte*)buf, len); 838 } 839 840 // PackageInfo data exists in order to support the java.lang.Package 841 // class. A Package object provides information about a java package 842 // (version, vendor, etc.) which originates in the manifest of the jar 843 // file supplying the package. For application classes, the ClassLoader 844 // object takes care of this. 845 846 // For system (boot) classes, the Java code in the Package class needs 847 // to be able to identify which source jar file contained the boot 848 // class, so that it can extract the manifest from it. This table 849 // identifies java packages with jar files in the boot classpath. 850 851 // Because the boot classpath cannot change, the classpath index is 852 // sufficient to identify the source jar file or directory. (Since 853 // directories have no manifests, the directory name is not required, 854 // but is available.) 855 856 // When using sharing -- the pathnames of entries in the boot classpath 857 // may not be the same at runtime as they were when the archive was 858 // created (NFS, Samba, etc.). The actual files and directories named 859 // in the classpath must be the same files, in the same order, even 860 // though the exact name is not the same. 861 862 class PackageInfo: public BasicHashtableEntry<mtClass> { 863 public: 864 const char* _pkgname; // Package name 865 int _classpath_index; // Index of directory or JAR file loaded from 866 867 PackageInfo* next() { 868 return (PackageInfo*)BasicHashtableEntry<mtClass>::next(); 869 } 870 871 const char* pkgname() { return _pkgname; } 872 void set_pkgname(char* pkgname) { _pkgname = pkgname; } 873 874 const char* filename() { 875 return ClassLoader::classpath_entry(_classpath_index)->name(); 876 } 877 878 void set_index(int index) { 879 _classpath_index = index; 880 } 881 }; 882 883 884 class PackageHashtable : public BasicHashtable<mtClass> { 885 private: 886 inline unsigned int compute_hash(const char *s, int n) { 887 unsigned int val = 0; 888 while (--n >= 0) { 889 val = *s++ + 31 * val; 890 } 891 return val; 892 } 893 894 PackageInfo* bucket(int index) { 895 return (PackageInfo*)BasicHashtable<mtClass>::bucket(index); 896 } 897 898 PackageInfo* get_entry(int index, unsigned int hash, 899 const char* pkgname, size_t n) { 900 for (PackageInfo* pp = bucket(index); pp != NULL; pp = pp->next()) { 901 if (pp->hash() == hash && 902 strncmp(pkgname, pp->pkgname(), n) == 0 && 903 pp->pkgname()[n] == '\0') { 904 return pp; 905 } 906 } 907 return NULL; 908 } 909 910 public: 911 PackageHashtable(int table_size) 912 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo)) {} 913 914 PackageHashtable(int table_size, HashtableBucket<mtClass>* t, int number_of_entries) 915 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo), t, number_of_entries) {} 916 917 PackageInfo* get_entry(const char* pkgname, int n) { 918 unsigned int hash = compute_hash(pkgname, n); 919 return get_entry(hash_to_index(hash), hash, pkgname, n); 920 } 921 922 PackageInfo* new_entry(char* pkgname, int n) { 923 unsigned int hash = compute_hash(pkgname, n); 924 PackageInfo* pp; 925 pp = (PackageInfo*)BasicHashtable<mtClass>::new_entry(hash); 926 pp->set_pkgname(pkgname); 927 return pp; 928 } 929 930 void add_entry(PackageInfo* pp) { 931 int index = hash_to_index(pp->hash()); 932 BasicHashtable<mtClass>::add_entry(index, pp); 933 } 934 935 void copy_pkgnames(const char** packages) { 936 int n = 0; 937 for (int i = 0; i < table_size(); ++i) { 938 for (PackageInfo* pp = bucket(i); pp != NULL; pp = pp->next()) { 939 packages[n++] = pp->pkgname(); 940 } 941 } 942 assert(n == number_of_entries(), "just checking"); 943 } 944 945 CDS_ONLY(void copy_table(char** top, char* end, PackageHashtable* table);) 946 }; 947 948 #if INCLUDE_CDS 949 void PackageHashtable::copy_table(char** top, char* end, 950 PackageHashtable* table) { 951 // Copy (relocate) the table to the shared space. 952 BasicHashtable<mtClass>::copy_table(top, end); 953 954 // Calculate the space needed for the package name strings. 955 int i; 956 intptr_t* tableSize = (intptr_t*)(*top); 957 *top += sizeof(intptr_t); // For table size 958 char* tableStart = *top; 959 960 for (i = 0; i < table_size(); ++i) { 961 for (PackageInfo* pp = table->bucket(i); 962 pp != NULL; 963 pp = pp->next()) { 964 int n1 = (int)(strlen(pp->pkgname()) + 1); 965 if (*top + n1 >= end) { 966 report_out_of_shared_space(SharedMiscData); 967 } 968 pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1)); 969 *top += n1; 970 } 971 } 972 *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord)); 973 if (*top >= end) { 974 report_out_of_shared_space(SharedMiscData); 975 } 976 977 // Write table size 978 intptr_t len = *top - (char*)tableStart; 979 *tableSize = len; 980 } 981 982 983 void ClassLoader::copy_package_info_buckets(char** top, char* end) { 984 _package_hash_table->copy_buckets(top, end); 985 } 986 987 void ClassLoader::copy_package_info_table(char** top, char* end) { 988 _package_hash_table->copy_table(top, end, _package_hash_table); 989 } 990 #endif 991 992 PackageInfo* ClassLoader::lookup_package(const char *pkgname) { 993 const char *cp = strrchr(pkgname, '/'); 994 if (cp != NULL) { 995 // Package prefix found 996 int n = cp - pkgname + 1; 997 return _package_hash_table->get_entry(pkgname, n); 998 } 999 return NULL; 1000 } 1001 1002 1003 bool ClassLoader::add_package(const char *pkgname, int classpath_index, TRAPS) { 1004 assert(pkgname != NULL, "just checking"); 1005 // Bootstrap loader no longer holds system loader lock obj serializing 1006 // load_instance_class and thereby add_package 1007 { 1008 MutexLocker ml(PackageTable_lock, THREAD); 1009 // First check for previously loaded entry 1010 PackageInfo* pp = lookup_package(pkgname); 1011 if (pp != NULL) { 1012 // Existing entry found, check source of package 1013 pp->set_index(classpath_index); 1014 return true; 1015 } 1016 1017 const char *cp = strrchr(pkgname, '/'); 1018 if (cp != NULL) { 1019 // Package prefix found 1020 int n = cp - pkgname + 1; 1021 1022 char* new_pkgname = NEW_C_HEAP_ARRAY(char, n + 1, mtClass); 1023 if (new_pkgname == NULL) { 1024 return false; 1025 } 1026 1027 memcpy(new_pkgname, pkgname, n); 1028 new_pkgname[n] = '\0'; 1029 pp = _package_hash_table->new_entry(new_pkgname, n); 1030 pp->set_index(classpath_index); 1031 1032 // Insert into hash table 1033 _package_hash_table->add_entry(pp); 1034 } 1035 return true; 1036 } 1037 } 1038 1039 1040 oop ClassLoader::get_system_package(const char* name, TRAPS) { 1041 PackageInfo* pp; 1042 { 1043 MutexLocker ml(PackageTable_lock, THREAD); 1044 pp = lookup_package(name); 1045 } 1046 if (pp == NULL) { 1047 return NULL; 1048 } else { 1049 Handle p = java_lang_String::create_from_str(pp->filename(), THREAD); 1050 return p(); 1051 } 1052 } 1053 1054 1055 objArrayOop ClassLoader::get_system_packages(TRAPS) { 1056 ResourceMark rm(THREAD); 1057 int nof_entries; 1058 const char** packages; 1059 { 1060 MutexLocker ml(PackageTable_lock, THREAD); 1061 // Allocate resource char* array containing package names 1062 nof_entries = _package_hash_table->number_of_entries(); 1063 if ((packages = NEW_RESOURCE_ARRAY(const char*, nof_entries)) == NULL) { 1064 return NULL; 1065 } 1066 _package_hash_table->copy_pkgnames(packages); 1067 } 1068 // Allocate objArray and fill with java.lang.String 1069 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), 1070 nof_entries, CHECK_0); 1071 objArrayHandle result(THREAD, r); 1072 for (int i = 0; i < nof_entries; i++) { 1073 Handle str = java_lang_String::create_from_str(packages[i], CHECK_0); 1074 result->obj_at_put(i, str()); 1075 } 1076 1077 return result(); 1078 } 1079 1080 1081 instanceKlassHandle ClassLoader::load_classfile(Symbol* h_name, TRAPS) { 1082 ResourceMark rm(THREAD); 1083 const char* class_name = h_name->as_C_string(); 1084 EventMark m("loading class %s", class_name); 1085 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion); 1086 1087 stringStream st; 1088 // st.print() uses too much stack space while handling a StackOverflowError 1089 // st.print("%s.class", h_name->as_utf8()); 1090 st.print_raw(h_name->as_utf8()); 1091 st.print_raw(".class"); 1092 const char* file_name = st.as_string(); 1093 ClassLoaderExt::Context context(class_name, file_name, THREAD); 1094 1095 // Lookup stream for parsing .class file 1096 ClassFileStream* stream = NULL; 1097 int classpath_index = 0; 1098 ClassPathEntry* e = NULL; 1099 instanceKlassHandle h; 1100 { 1101 PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(), 1102 ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(), 1103 PerfClassTraceTime::CLASS_LOAD); 1104 e = _first_entry; 1105 while (e != NULL) { 1106 stream = e->open_stream(file_name, CHECK_NULL); 1107 if (!context.check(stream, classpath_index)) { 1108 return h; // NULL 1109 } 1110 if (stream != NULL) { 1111 break; 1112 } 1113 e = e->next(); 1114 ++classpath_index; 1115 } 1116 } 1117 1118 if (stream != NULL) { 1119 // class file found, parse it 1120 ClassFileParser parser(stream); 1121 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 1122 Handle protection_domain; 1123 TempNewSymbol parsed_name = NULL; 1124 instanceKlassHandle result = parser.parseClassFile(h_name, 1125 loader_data, 1126 protection_domain, 1127 parsed_name, 1128 context.should_verify(classpath_index), 1129 THREAD); 1130 if (HAS_PENDING_EXCEPTION) { 1131 ResourceMark rm; 1132 if (DumpSharedSpaces) { 1133 tty->print_cr("Preload Error: Failed to load %s", class_name); 1134 } 1135 return h; 1136 } 1137 h = context.record_result(classpath_index, e, result, THREAD); 1138 } else { 1139 if (DumpSharedSpaces) { 1140 tty->print_cr("Preload Warning: Cannot find %s", class_name); 1141 } 1142 } 1143 1144 return h; 1145 } 1146 1147 1148 void ClassLoader::create_package_info_table(HashtableBucket<mtClass> *t, int length, 1149 int number_of_entries) { 1150 assert(_package_hash_table == NULL, "One package info table allowed."); 1151 assert(length == package_hash_table_size * sizeof(HashtableBucket<mtClass>), 1152 "bad shared package info size."); 1153 _package_hash_table = new PackageHashtable(package_hash_table_size, t, 1154 number_of_entries); 1155 } 1156 1157 1158 void ClassLoader::create_package_info_table() { 1159 assert(_package_hash_table == NULL, "shouldn't have one yet"); 1160 _package_hash_table = new PackageHashtable(package_hash_table_size); 1161 } 1162 1163 1164 // Initialize the class loader's access to methods in libzip. Parse and 1165 // process the boot classpath into a list ClassPathEntry objects. Once 1166 // this list has been created, it must not change order (see class PackageInfo) 1167 // it can be appended to and is by jvmti and the kernel vm. 1168 1169 void ClassLoader::initialize() { 1170 assert(_package_hash_table == NULL, "should have been initialized by now."); 1171 EXCEPTION_MARK; 1172 1173 if (UsePerfData) { 1174 // jvmstat performance counters 1175 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time"); 1176 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime"); 1177 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self"); 1178 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime"); 1179 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self"); 1180 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime"); 1181 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self"); 1182 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses"); 1183 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses"); 1184 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses"); 1185 1186 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime"); 1187 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self"); 1188 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime"); 1189 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime"); 1190 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime"); 1191 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime"); 1192 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self"); 1193 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount"); 1194 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses"); 1195 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime"); 1196 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self"); 1197 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes"); 1198 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes"); 1199 1200 1201 // The following performance counters are added for measuring the impact 1202 // of the bug fix of 6365597. They are mainly focused on finding out 1203 // the behavior of system & user-defined classloader lock, whether 1204 // ClassLoader.loadClass/findClass is being called synchronized or not. 1205 // Also two additional counters are created to see whether 'UnsyncloadClass' 1206 // flag is being set or not and how many times load_instance_class call 1207 // fails with linkageError etc. 1208 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS, 1209 "systemLoaderLockContentionRate"); 1210 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS, 1211 "nonSystemLoaderLockContentionRate"); 1212 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS, 1213 "jvmFindLoadedClassNoLockCalls"); 1214 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS, 1215 "jvmDefineClassNoLockCalls"); 1216 1217 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS, 1218 "jniDefineClassNoLockCalls"); 1219 1220 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, 1221 "unsafeDefineClassCalls"); 1222 1223 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet"); 1224 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS, 1225 "loadInstanceClassFailRate"); 1226 1227 // increment the isUnsyncloadClass counter if UnsyncloadClass is set. 1228 if (UnsyncloadClass) { 1229 _isUnsyncloadClass->inc(); 1230 } 1231 } 1232 1233 // lookup zip library entry points 1234 load_zip_library(); 1235 #if INCLUDE_CDS 1236 // initialize search path 1237 if (DumpSharedSpaces) { 1238 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info(); 1239 } 1240 #endif 1241 setup_bootstrap_search_path(); 1242 if (LazyBootClassLoader) { 1243 // set up meta index which makes boot classpath initialization lazier 1244 setup_bootstrap_meta_index(); 1245 } 1246 } 1247 1248 #if INCLUDE_CDS 1249 void ClassLoader::initialize_shared_path() { 1250 if (DumpSharedSpaces) { 1251 ClassLoaderExt::setup_search_paths(); 1252 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check() 1253 } 1254 } 1255 #endif 1256 1257 jlong ClassLoader::classloader_time_ms() { 1258 return UsePerfData ? 1259 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1; 1260 } 1261 1262 jlong ClassLoader::class_init_count() { 1263 return UsePerfData ? _perf_classes_inited->get_value() : -1; 1264 } 1265 1266 jlong ClassLoader::class_init_time_ms() { 1267 return UsePerfData ? 1268 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1; 1269 } 1270 1271 jlong ClassLoader::class_verify_time_ms() { 1272 return UsePerfData ? 1273 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1; 1274 } 1275 1276 jlong ClassLoader::class_link_count() { 1277 return UsePerfData ? _perf_classes_linked->get_value() : -1; 1278 } 1279 1280 jlong ClassLoader::class_link_time_ms() { 1281 return UsePerfData ? 1282 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1; 1283 } 1284 1285 int ClassLoader::compute_Object_vtable() { 1286 // hardwired for JDK1.2 -- would need to duplicate class file parsing 1287 // code to determine actual value from file 1288 // Would be value '11' if finals were in vtable 1289 int JDK_1_2_Object_vtable_size = 5; 1290 return JDK_1_2_Object_vtable_size * vtableEntry::size(); 1291 } 1292 1293 1294 void classLoader_init() { 1295 ClassLoader::initialize(); 1296 } 1297 1298 1299 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) { 1300 assert(orig != NULL && out != NULL && len > 0, "bad arguments"); 1301 if (CanonicalizeEntry != NULL) { 1302 JavaThread* THREAD = JavaThread::current(); 1303 JNIEnv* env = THREAD->jni_environment(); 1304 ResourceMark rm(THREAD); 1305 1306 // os::native_path writes into orig_copy 1307 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1); 1308 strcpy(orig_copy, orig); 1309 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) { 1310 return false; 1311 } 1312 } else { 1313 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing 1314 strncpy(out, orig, len); 1315 out[len - 1] = '\0'; 1316 } 1317 return true; 1318 } 1319 1320 #ifndef PRODUCT 1321 1322 void ClassLoader::verify() { 1323 _package_hash_table->verify(); 1324 } 1325 1326 1327 // CompileTheWorld 1328 // 1329 // Iterates over all class path entries and forces compilation of all methods 1330 // in all classes found. Currently, only zip/jar archives are searched. 1331 // 1332 // The classes are loaded by the Java level bootstrap class loader, and the 1333 // initializer is called. If DelayCompilationDuringStartup is true (default), 1334 // the interpreter will run the initialization code. Note that forcing 1335 // initialization in this way could potentially lead to initialization order 1336 // problems, in which case we could just force the initialization bit to be set. 1337 1338 1339 // We need to iterate over the contents of a zip/jar file, so we replicate the 1340 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile, 1341 // since jzfile already has a void* definition. 1342 // 1343 // Note that this is only used in debug mode. 1344 // 1345 // HotSpot integration note: 1346 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build 1347 1348 1349 // JDK 1.3 version 1350 typedef struct real_jzentry13 { /* Zip file entry */ 1351 char *name; /* entry name */ 1352 jint time; /* modification time */ 1353 jint size; /* size of uncompressed data */ 1354 jint csize; /* size of compressed data (zero if uncompressed) */ 1355 jint crc; /* crc of uncompressed data */ 1356 char *comment; /* optional zip file comment */ 1357 jbyte *extra; /* optional extra data */ 1358 jint pos; /* position of LOC header (if negative) or data */ 1359 } real_jzentry13; 1360 1361 typedef struct real_jzfile13 { /* Zip file */ 1362 char *name; /* zip file name */ 1363 jint refs; /* number of active references */ 1364 jint fd; /* open file descriptor */ 1365 void *lock; /* read lock */ 1366 char *comment; /* zip file comment */ 1367 char *msg; /* zip error message */ 1368 void *entries; /* array of hash cells */ 1369 jint total; /* total number of entries */ 1370 unsigned short *table; /* Hash chain heads: indexes into entries */ 1371 jint tablelen; /* number of hash eads */ 1372 real_jzfile13 *next; /* next zip file in search list */ 1373 jzentry *cache; /* we cache the most recently freed jzentry */ 1374 /* Information on metadata names in META-INF directory */ 1375 char **metanames; /* array of meta names (may have null names) */ 1376 jint metacount; /* number of slots in metanames array */ 1377 /* If there are any per-entry comments, they are in the comments array */ 1378 char **comments; 1379 } real_jzfile13; 1380 1381 // JDK 1.2 version 1382 typedef struct real_jzentry12 { /* Zip file entry */ 1383 char *name; /* entry name */ 1384 jint time; /* modification time */ 1385 jint size; /* size of uncompressed data */ 1386 jint csize; /* size of compressed data (zero if uncompressed) */ 1387 jint crc; /* crc of uncompressed data */ 1388 char *comment; /* optional zip file comment */ 1389 jbyte *extra; /* optional extra data */ 1390 jint pos; /* position of LOC header (if negative) or data */ 1391 struct real_jzentry12 *next; /* next entry in hash table */ 1392 } real_jzentry12; 1393 1394 typedef struct real_jzfile12 { /* Zip file */ 1395 char *name; /* zip file name */ 1396 jint refs; /* number of active references */ 1397 jint fd; /* open file descriptor */ 1398 void *lock; /* read lock */ 1399 char *comment; /* zip file comment */ 1400 char *msg; /* zip error message */ 1401 real_jzentry12 *entries; /* array of zip entries */ 1402 jint total; /* total number of entries */ 1403 real_jzentry12 **table; /* hash table of entries */ 1404 jint tablelen; /* number of buckets */ 1405 jzfile *next; /* next zip file in search list */ 1406 } real_jzfile12; 1407 1408 1409 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) { 1410 // For now we only compile all methods in all classes in zip/jar files 1411 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir); 1412 tty->cr(); 1413 } 1414 1415 1416 bool ClassPathDirEntry::is_rt_jar() { 1417 return false; 1418 } 1419 1420 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) { 1421 if (JDK_Version::is_jdk12x_version()) { 1422 compile_the_world12(loader, THREAD); 1423 } else { 1424 compile_the_world13(loader, THREAD); 1425 } 1426 if (HAS_PENDING_EXCEPTION) { 1427 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1428 CLEAR_PENDING_EXCEPTION; 1429 tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); 1430 tty->print_cr("Increase class metadata storage if a limit was set"); 1431 } else { 1432 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); 1433 } 1434 } 1435 } 1436 1437 // Version that works for JDK 1.3.x 1438 void ClassPathZipEntry::compile_the_world13(Handle loader, TRAPS) { 1439 real_jzfile13* zip = (real_jzfile13*) _zip; 1440 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name); 1441 tty->cr(); 1442 // Iterate over all entries in zip file 1443 for (int n = 0; ; n++) { 1444 real_jzentry13 * ze = (real_jzentry13 *)((*GetNextEntry)(_zip, n)); 1445 if (ze == NULL) break; 1446 ClassLoader::compile_the_world_in(ze->name, loader, CHECK); 1447 } 1448 } 1449 1450 1451 // Version that works for JDK 1.2.x 1452 void ClassPathZipEntry::compile_the_world12(Handle loader, TRAPS) { 1453 real_jzfile12* zip = (real_jzfile12*) _zip; 1454 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name); 1455 tty->cr(); 1456 // Iterate over all entries in zip file 1457 for (int n = 0; ; n++) { 1458 real_jzentry12 * ze = (real_jzentry12 *)((*GetNextEntry)(_zip, n)); 1459 if (ze == NULL) break; 1460 ClassLoader::compile_the_world_in(ze->name, loader, CHECK); 1461 } 1462 } 1463 1464 bool ClassPathZipEntry::is_rt_jar() { 1465 if (JDK_Version::is_jdk12x_version()) { 1466 return is_rt_jar12(); 1467 } else { 1468 return is_rt_jar13(); 1469 } 1470 } 1471 1472 // JDK 1.3 version 1473 bool ClassPathZipEntry::is_rt_jar13() { 1474 real_jzfile13* zip = (real_jzfile13*) _zip; 1475 int len = (int)strlen(zip->name); 1476 // Check whether zip name ends in "rt.jar" 1477 // This will match other archives named rt.jar as well, but this is 1478 // only used for debugging. 1479 return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0); 1480 } 1481 1482 // JDK 1.2 version 1483 bool ClassPathZipEntry::is_rt_jar12() { 1484 real_jzfile12* zip = (real_jzfile12*) _zip; 1485 int len = (int)strlen(zip->name); 1486 // Check whether zip name ends in "rt.jar" 1487 // This will match other archives named rt.jar as well, but this is 1488 // only used for debugging. 1489 return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0); 1490 } 1491 1492 void LazyClassPathEntry::compile_the_world(Handle loader, TRAPS) { 1493 ClassPathEntry* cpe = resolve_entry(THREAD); 1494 if (cpe != NULL) { 1495 cpe->compile_the_world(loader, CHECK); 1496 } 1497 } 1498 1499 bool LazyClassPathEntry::is_rt_jar() { 1500 Thread* THREAD = Thread::current(); 1501 ClassPathEntry* cpe = resolve_entry(THREAD); 1502 return (cpe != NULL) ? cpe->is_jar_file() : false; 1503 } 1504 1505 void ClassLoader::compile_the_world() { 1506 EXCEPTION_MARK; 1507 HandleMark hm(THREAD); 1508 ResourceMark rm(THREAD); 1509 // Make sure we don't run with background compilation 1510 BackgroundCompilation = false; 1511 // Find bootstrap loader 1512 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader()); 1513 // Iterate over all bootstrap class path entries 1514 ClassPathEntry* e = _first_entry; 1515 jlong start = os::javaTimeMillis(); 1516 while (e != NULL) { 1517 // We stop at rt.jar, unless it is the first bootstrap path entry 1518 if (e->is_rt_jar() && e != _first_entry) break; 1519 e->compile_the_world(system_class_loader, CATCH); 1520 e = e->next(); 1521 } 1522 jlong end = os::javaTimeMillis(); 1523 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)", 1524 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start)); 1525 { 1526 // Print statistics as if before normal exit: 1527 extern void print_statistics(); 1528 print_statistics(); 1529 } 1530 vm_exit(0); 1531 } 1532 1533 int ClassLoader::_compile_the_world_class_counter = 0; 1534 int ClassLoader::_compile_the_world_method_counter = 0; 1535 static int _codecache_sweep_counter = 0; 1536 1537 // Filter out all exceptions except OOMs 1538 static void clear_pending_exception_if_not_oom(TRAPS) { 1539 if (HAS_PENDING_EXCEPTION && 1540 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1541 CLEAR_PENDING_EXCEPTION; 1542 } 1543 // The CHECK at the caller will propagate the exception out 1544 } 1545 1546 /** 1547 * Returns if the given method should be compiled when doing compile-the-world. 1548 * 1549 * TODO: This should be a private method in a CompileTheWorld class. 1550 */ 1551 static bool can_be_compiled(methodHandle m, int comp_level) { 1552 assert(CompileTheWorld, "must be"); 1553 1554 // It's not valid to compile a native wrapper for MethodHandle methods 1555 // that take a MemberName appendix since the bytecode signature is not 1556 // correct. 1557 vmIntrinsics::ID iid = m->intrinsic_id(); 1558 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) { 1559 return false; 1560 } 1561 1562 return CompilationPolicy::can_be_compiled(m, comp_level); 1563 } 1564 1565 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) { 1566 int len = (int)strlen(name); 1567 if (len > 6 && strcmp(".class", name + len - 6) == 0) { 1568 // We have a .class file 1569 char buffer[2048]; 1570 strncpy(buffer, name, len - 6); 1571 buffer[len-6] = 0; 1572 // If the file has a period after removing .class, it's not really a 1573 // valid class file. The class loader will check everything else. 1574 if (strchr(buffer, '.') == NULL) { 1575 _compile_the_world_class_counter++; 1576 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return; 1577 1578 // Construct name without extension 1579 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK); 1580 // Use loader to load and initialize class 1581 Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD); 1582 instanceKlassHandle k (THREAD, ik); 1583 if (k.not_null() && !HAS_PENDING_EXCEPTION) { 1584 k->initialize(THREAD); 1585 } 1586 bool exception_occurred = HAS_PENDING_EXCEPTION; 1587 clear_pending_exception_if_not_oom(CHECK); 1588 if (CompileTheWorldPreloadClasses && k.not_null()) { 1589 ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD); 1590 if (HAS_PENDING_EXCEPTION) { 1591 // If something went wrong in preloading we just ignore it 1592 clear_pending_exception_if_not_oom(CHECK); 1593 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer); 1594 } 1595 } 1596 1597 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) { 1598 if (k.is_null() || exception_occurred) { 1599 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class 1600 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer); 1601 } else { 1602 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer); 1603 // Preload all classes to get around uncommon traps 1604 // Iterate over all methods in class 1605 int comp_level = CompilationPolicy::policy()->initial_compile_level(); 1606 for (int n = 0; n < k->methods()->length(); n++) { 1607 methodHandle m (THREAD, k->methods()->at(n)); 1608 if (can_be_compiled(m, comp_level)) { 1609 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) { 1610 // Give sweeper a chance to keep up with CTW 1611 VM_ForceSafepoint op; 1612 VMThread::execute(&op); 1613 _codecache_sweep_counter = 0; 1614 } 1615 // Force compilation 1616 CompileBroker::compile_method(m, InvocationEntryBci, comp_level, 1617 methodHandle(), 0, "CTW", THREAD); 1618 if (HAS_PENDING_EXCEPTION) { 1619 clear_pending_exception_if_not_oom(CHECK); 1620 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1621 } else { 1622 _compile_the_world_method_counter++; 1623 } 1624 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) { 1625 // Clobber the first compile and force second tier compilation 1626 nmethod* nm = m->code(); 1627 if (nm != NULL && !m->is_method_handle_intrinsic()) { 1628 // Throw out the code so that the code cache doesn't fill up 1629 nm->make_not_entrant(); 1630 } 1631 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization, 1632 methodHandle(), 0, "CTW", THREAD); 1633 if (HAS_PENDING_EXCEPTION) { 1634 clear_pending_exception_if_not_oom(CHECK); 1635 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1636 } else { 1637 _compile_the_world_method_counter++; 1638 } 1639 } 1640 } else { 1641 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1642 } 1643 1644 nmethod* nm = m->code(); 1645 if (nm != NULL && !m->is_method_handle_intrinsic()) { 1646 // Throw out the code so that the code cache doesn't fill up 1647 nm->make_not_entrant(); 1648 } 1649 } 1650 } 1651 } 1652 } 1653 } 1654 } 1655 1656 #endif //PRODUCT 1657 1658 // Please keep following two functions at end of this file. With them placed at top or in middle of the file, 1659 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589. 1660 void PerfClassTraceTime::initialize() { 1661 if (!UsePerfData) return; 1662 1663 if (_eventp != NULL) { 1664 // increment the event counter 1665 _eventp->inc(); 1666 } 1667 1668 // stop the current active thread-local timer to measure inclusive time 1669 _prev_active_event = -1; 1670 for (int i=0; i < EVENT_TYPE_COUNT; i++) { 1671 if (_timers[i].is_active()) { 1672 assert(_prev_active_event == -1, "should have only one active timer"); 1673 _prev_active_event = i; 1674 _timers[i].stop(); 1675 } 1676 } 1677 1678 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) { 1679 // start the inclusive timer if not recursively called 1680 _t.start(); 1681 } 1682 1683 // start thread-local timer of the given event type 1684 if (!_timers[_event_type].is_active()) { 1685 _timers[_event_type].start(); 1686 } 1687 } 1688 1689 PerfClassTraceTime::~PerfClassTraceTime() { 1690 if (!UsePerfData) return; 1691 1692 // stop the thread-local timer as the event completes 1693 // and resume the thread-local timer of the event next on the stack 1694 _timers[_event_type].stop(); 1695 jlong selftime = _timers[_event_type].ticks(); 1696 1697 if (_prev_active_event >= 0) { 1698 _timers[_prev_active_event].start(); 1699 } 1700 1701 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return; 1702 1703 // increment the counters only on the leaf call 1704 _t.stop(); 1705 _timep->inc(_t.ticks()); 1706 if (_selftimep != NULL) { 1707 _selftimep->inc(selftime); 1708 } 1709 // add all class loading related event selftime to the accumulated time counter 1710 ClassLoader::perf_accumulated_time()->inc(selftime); 1711 1712 // reset the timer 1713 _timers[_event_type].reset(); 1714 }