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/imageFile.hpp" 32 #include "classfile/javaClasses.hpp" 33 #if INCLUDE_CDS 34 #include "classfile/sharedPathsMiscInfo.hpp" 35 #include "classfile/sharedClassUtil.hpp" 36 #endif 37 #include "classfile/systemDictionary.hpp" 38 #include "classfile/vmSymbols.hpp" 39 #include "compiler/compileBroker.hpp" 40 #include "gc_interface/collectedHeap.inline.hpp" 41 #include "interpreter/bytecodeStream.hpp" 42 #include "interpreter/oopMapCache.hpp" 43 #include "memory/allocation.inline.hpp" 44 #include "memory/filemap.hpp" 45 #include "memory/generation.hpp" 46 #include "memory/oopFactory.hpp" 47 #include "memory/universe.inline.hpp" 48 #include "oops/instanceKlass.hpp" 49 #include "oops/instanceRefKlass.hpp" 50 #include "oops/oop.inline.hpp" 51 #include "oops/symbol.hpp" 52 #include "prims/jvm_misc.hpp" 53 #include "runtime/arguments.hpp" 54 #include "runtime/compilationPolicy.hpp" 55 #include "runtime/fprofiler.hpp" 56 #include "runtime/handles.hpp" 57 #include "runtime/handles.inline.hpp" 58 #include "runtime/init.hpp" 59 #include "runtime/interfaceSupport.hpp" 60 #include "runtime/java.hpp" 61 #include "runtime/javaCalls.hpp" 62 #include "runtime/os.hpp" 63 #include "runtime/threadCritical.hpp" 64 #include "runtime/timer.hpp" 65 #include "services/management.hpp" 66 #include "services/threadService.hpp" 67 #include "utilities/events.hpp" 68 #include "utilities/hashtable.hpp" 69 #include "utilities/hashtable.inline.hpp" 70 71 // Entry points in zip.dll for loading zip/jar file entries and image file entries 72 73 typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg); 74 typedef void (JNICALL *ZipClose_t)(jzfile *zip); 75 typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen); 76 typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf); 77 typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf); 78 typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n); 79 typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg); 80 typedef jint (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len); 81 82 static ZipOpen_t ZipOpen = NULL; 83 static ZipClose_t ZipClose = NULL; 84 static FindEntry_t FindEntry = NULL; 85 static ReadEntry_t ReadEntry = NULL; 86 static ReadMappedEntry_t ReadMappedEntry = NULL; 87 static GetNextEntry_t GetNextEntry = NULL; 88 static canonicalize_fn_t CanonicalizeEntry = NULL; 89 static ZipInflateFully_t ZipInflateFully = NULL; 90 static Crc32_t Crc32 = NULL; 91 92 // Globals 93 94 PerfCounter* ClassLoader::_perf_accumulated_time = NULL; 95 PerfCounter* ClassLoader::_perf_classes_inited = NULL; 96 PerfCounter* ClassLoader::_perf_class_init_time = NULL; 97 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL; 98 PerfCounter* ClassLoader::_perf_classes_verified = NULL; 99 PerfCounter* ClassLoader::_perf_class_verify_time = NULL; 100 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL; 101 PerfCounter* ClassLoader::_perf_classes_linked = NULL; 102 PerfCounter* ClassLoader::_perf_class_link_time = NULL; 103 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL; 104 PerfCounter* ClassLoader::_perf_class_parse_time = NULL; 105 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL; 106 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL; 107 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL; 108 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL; 109 PerfCounter* ClassLoader::_perf_app_classload_time = NULL; 110 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL; 111 PerfCounter* ClassLoader::_perf_app_classload_count = NULL; 112 PerfCounter* ClassLoader::_perf_define_appclasses = NULL; 113 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL; 114 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL; 115 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL; 116 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL; 117 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL; 118 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL; 119 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL; 120 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL; 121 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL; 122 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL; 123 PerfCounter* ClassLoader::_isUnsyncloadClass = NULL; 124 PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL; 125 126 ClassPathEntry* ClassLoader::_first_entry = NULL; 127 ClassPathEntry* ClassLoader::_last_entry = NULL; 128 int ClassLoader::_num_entries = 0; 129 PackageHashtable* ClassLoader::_package_hash_table = NULL; 130 131 #if INCLUDE_CDS 132 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL; 133 #endif 134 // helper routines 135 bool string_starts_with(const char* str, const char* str_to_find) { 136 size_t str_len = strlen(str); 137 size_t str_to_find_len = strlen(str_to_find); 138 if (str_to_find_len > str_len) { 139 return false; 140 } 141 return (strncmp(str, str_to_find, str_to_find_len) == 0); 142 } 143 144 bool string_ends_with(const char* str, const char* str_to_find) { 145 size_t str_len = strlen(str); 146 size_t str_to_find_len = strlen(str_to_find); 147 if (str_to_find_len > str_len) { 148 return false; 149 } 150 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0); 151 } 152 153 154 MetaIndex::MetaIndex(char** meta_package_names, int num_meta_package_names) { 155 if (num_meta_package_names == 0) { 156 _meta_package_names = NULL; 157 _num_meta_package_names = 0; 158 } else { 159 _meta_package_names = NEW_C_HEAP_ARRAY(char*, num_meta_package_names, mtClass); 160 _num_meta_package_names = num_meta_package_names; 161 memcpy(_meta_package_names, meta_package_names, num_meta_package_names * sizeof(char*)); 162 } 163 } 164 165 166 MetaIndex::~MetaIndex() { 167 FREE_C_HEAP_ARRAY(char*, _meta_package_names, mtClass); 168 } 169 170 171 bool MetaIndex::may_contain(const char* class_name) { 172 if ( _num_meta_package_names == 0) { 173 return false; 174 } 175 size_t class_name_len = strlen(class_name); 176 for (int i = 0; i < _num_meta_package_names; i++) { 177 char* pkg = _meta_package_names[i]; 178 size_t pkg_len = strlen(pkg); 179 size_t min_len = MIN2(class_name_len, pkg_len); 180 if (!strncmp(class_name, pkg, min_len)) { 181 return true; 182 } 183 } 184 return false; 185 } 186 187 188 ClassPathEntry::ClassPathEntry() { 189 set_next(NULL); 190 } 191 192 193 bool ClassPathEntry::is_lazy() { 194 return false; 195 } 196 197 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() { 198 char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass); 199 strcpy(copy, dir); 200 _dir = copy; 201 } 202 203 204 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) { 205 // construct full path name 206 char path[JVM_MAXPATHLEN]; 207 if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) { 208 return NULL; 209 } 210 // check if file exists 211 struct stat st; 212 if (os::stat(path, &st) == 0) { 213 #if INCLUDE_CDS 214 if (DumpSharedSpaces) { 215 // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so 216 // we should never find a file underneath it -- unless user has added a new file while we are running 217 // the dump, in which case let's quit! 218 ShouldNotReachHere(); 219 } 220 #endif 221 // found file, open it 222 int file_handle = os::open(path, 0, 0); 223 if (file_handle != -1) { 224 // read contents into resource array 225 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size); 226 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size); 227 // close file 228 os::close(file_handle); 229 // construct ClassFileStream 230 if (num_read == (size_t)st.st_size) { 231 if (UsePerfData) { 232 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read); 233 } 234 return new ClassFileStream(buffer, st.st_size, _dir); // Resource allocated 235 } 236 } 237 } 238 return NULL; 239 } 240 241 242 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() { 243 _zip = zip; 244 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass); 245 strcpy(copy, zip_name); 246 _zip_name = copy; 247 } 248 249 ClassPathZipEntry::~ClassPathZipEntry() { 250 if (ZipClose != NULL) { 251 (*ZipClose)(_zip); 252 } 253 FREE_C_HEAP_ARRAY(char, _zip_name, mtClass); 254 } 255 256 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) { 257 // enable call to C land 258 JavaThread* thread = JavaThread::current(); 259 ThreadToNativeFromVM ttn(thread); 260 // check whether zip archive contains name 261 jint name_len; 262 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len); 263 if (entry == NULL) return NULL; 264 u1* buffer; 265 char name_buf[128]; 266 char* filename; 267 if (name_len < 128) { 268 filename = name_buf; 269 } else { 270 filename = NEW_RESOURCE_ARRAY(char, name_len + 1); 271 } 272 273 // file found, get pointer to the entry in mmapped jar file. 274 if (ReadMappedEntry == NULL || 275 !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) { 276 // mmapped access not available, perhaps due to compression, 277 // read contents into resource array 278 int size = (*filesize) + ((nul_terminate) ? 1 : 0); 279 buffer = NEW_RESOURCE_ARRAY(u1, size); 280 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL; 281 } 282 283 // return result 284 if (nul_terminate) { 285 buffer[*filesize] = 0; 286 } 287 return buffer; 288 } 289 290 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) { 291 jint filesize; 292 u1* buffer = open_entry(name, &filesize, false, CHECK_NULL); 293 if (buffer == NULL) { 294 return NULL; 295 } 296 if (UsePerfData) { 297 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize); 298 } 299 return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated 300 } 301 302 // invoke function for each entry in the zip file 303 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) { 304 JavaThread* thread = JavaThread::current(); 305 HandleMark handle_mark(thread); 306 ThreadToNativeFromVM ttn(thread); 307 for (int n = 0; ; n++) { 308 jzentry * ze = ((*GetNextEntry)(_zip, n)); 309 if (ze == NULL) break; 310 (*f)(ze->name, context); 311 } 312 } 313 314 LazyClassPathEntry::LazyClassPathEntry(const char* path, const struct stat* st, bool throw_exception) : ClassPathEntry() { 315 _path = os::strdup_check_oom(path); 316 _st = *st; 317 _meta_index = NULL; 318 _resolved_entry = NULL; 319 _has_error = false; 320 _throw_exception = throw_exception; 321 } 322 323 LazyClassPathEntry::~LazyClassPathEntry() { 324 os::free((void*)_path); 325 } 326 327 bool LazyClassPathEntry::is_jar_file() { 328 size_t len = strlen(_path); 329 if (len < 4 || strcmp(_path + len - 4, ".jar") != 0) return false; 330 return ((_st.st_mode & S_IFREG) == S_IFREG); 331 } 332 333 ClassPathEntry* LazyClassPathEntry::resolve_entry(TRAPS) { 334 if (_resolved_entry != NULL) { 335 return (ClassPathEntry*) _resolved_entry; 336 } 337 ClassPathEntry* new_entry = NULL; 338 new_entry = ClassLoader::create_class_path_entry(_path, &_st, false, _throw_exception, CHECK_NULL); 339 if (!_throw_exception && new_entry == NULL) { 340 assert(!HAS_PENDING_EXCEPTION, "must be"); 341 return NULL; 342 } 343 { 344 ThreadCritical tc; 345 if (_resolved_entry == NULL) { 346 _resolved_entry = new_entry; 347 return new_entry; 348 } 349 } 350 assert(_resolved_entry != NULL, "bug in MT-safe resolution logic"); 351 delete new_entry; 352 return (ClassPathEntry*) _resolved_entry; 353 } 354 355 ClassFileStream* LazyClassPathEntry::open_stream(const char* name, TRAPS) { 356 if (_meta_index != NULL && 357 !_meta_index->may_contain(name)) { 358 return NULL; 359 } 360 if (_has_error) { 361 return NULL; 362 } 363 ClassPathEntry* cpe = resolve_entry(THREAD); 364 if (cpe == NULL) { 365 _has_error = true; 366 return NULL; 367 } else { 368 return cpe->open_stream(name, THREAD); 369 } 370 } 371 372 bool LazyClassPathEntry::is_lazy() { 373 return true; 374 } 375 376 u1* LazyClassPathEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) { 377 if (_has_error) { 378 return NULL; 379 } 380 ClassPathEntry* cpe = resolve_entry(THREAD); 381 if (cpe == NULL) { 382 _has_error = true; 383 return NULL; 384 } else if (cpe->is_jar_file()) { 385 return ((ClassPathZipEntry*)cpe)->open_entry(name, filesize, nul_terminate,THREAD); 386 } else { 387 ShouldNotReachHere(); 388 *filesize = 0; 389 return NULL; 390 } 391 } 392 393 ClassPathImageEntry::ClassPathImageEntry(char* name) : ClassPathEntry(), _image(new ImageFile(name)) { 394 bool opened = _image->open(); 395 if (!opened) { 396 _image = NULL; 397 } 398 } 399 400 ClassPathImageEntry::~ClassPathImageEntry() { 401 if (_image) { 402 _image->close(); 403 _image = NULL; 404 } 405 } 406 407 const char* ClassPathImageEntry::name() { 408 return _image ? _image->name() : ""; 409 } 410 411 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) { 412 u1* buffer; 413 u8 size; 414 _image->get_resource(name, buffer, size); 415 416 if (buffer) { 417 if (UsePerfData) { 418 ClassLoader::perf_sys_classfile_bytes_read()->inc(size); 419 } 420 return new ClassFileStream(buffer, (int)size, (char*)name); // Resource allocated 421 } 422 423 return NULL; 424 } 425 426 #ifndef PRODUCT 427 void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) { 428 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name()); 429 tty->cr(); 430 const ImageStrings strings = _image->get_strings(); 431 // Retrieve each path component string. 432 u4 count = _image->get_location_count(); 433 for (u4 i = 0; i < count; i++) { 434 u1* location_data = _image->get_location_data(i); 435 436 if (location_data) { 437 ImageLocation location(location_data); 438 const char* parent = location.get_attribute(ImageLocation::ATTRIBUTE_PARENT, strings); 439 const char* base = location.get_attribute(ImageLocation::ATTRIBUTE_BASE, strings); 440 const char* extension = location.get_attribute(ImageLocation::ATTRIBUTE_EXTENSION, strings); 441 assert((strlen(parent) + strlen(base) + strlen(extension)) < JVM_MAXPATHLEN, "path exceeds buffer"); 442 char path[JVM_MAXPATHLEN]; 443 strcpy(path, parent); 444 strcat(path, base); 445 strcat(path, extension); 446 ClassLoader::compile_the_world_in(path, loader, CHECK); 447 } 448 } 449 if (HAS_PENDING_EXCEPTION) { 450 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 451 CLEAR_PENDING_EXCEPTION; 452 tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); 453 tty->print_cr("Increase class metadata storage if a limit was set"); 454 } else { 455 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); 456 } 457 } 458 } 459 460 bool ClassPathImageEntry::is_jrt() { 461 return string_ends_with(name(), "bootmodules.jimage"); 462 } 463 #endif 464 465 static void print_meta_index(LazyClassPathEntry* entry, 466 GrowableArray<char*>& meta_packages) { 467 tty->print("[Meta index for %s=", entry->name()); 468 for (int i = 0; i < meta_packages.length(); i++) { 469 if (i > 0) tty->print(" "); 470 tty->print("%s", meta_packages.at(i)); 471 } 472 tty->print_cr("]"); 473 } 474 475 #if INCLUDE_CDS 476 void ClassLoader::exit_with_path_failure(const char* error, const char* message) { 477 assert(DumpSharedSpaces, "only called at dump time"); 478 tty->print_cr("Hint: enable -XX:+TraceClassPaths to diagnose the failure"); 479 vm_exit_during_initialization(error, message); 480 } 481 #endif 482 483 void ClassLoader::trace_class_path(const char* msg, const char* name) { 484 if (!TraceClassPaths) { 485 return; 486 } 487 488 if (msg) { 489 tty->print("%s", msg); 490 } 491 if (name) { 492 if (strlen(name) < 256) { 493 tty->print("%s", name); 494 } else { 495 // For very long paths, we need to print each character separately, 496 // as print_cr() has a length limit 497 while (name[0] != '\0') { 498 tty->print("%c", name[0]); 499 name++; 500 } 501 } 502 } 503 if (msg && msg[0] == '[') { 504 tty->print_cr("]"); 505 } else { 506 tty->cr(); 507 } 508 } 509 510 void ClassLoader::setup_bootstrap_meta_index() { 511 // Set up meta index which allows us to open boot jars lazily if 512 // class data sharing is enabled 513 const char* meta_index_path = Arguments::get_meta_index_path(); 514 const char* meta_index_dir = Arguments::get_meta_index_dir(); 515 setup_meta_index(meta_index_path, meta_index_dir, 0); 516 } 517 518 void ClassLoader::setup_meta_index(const char* meta_index_path, const char* meta_index_dir, int start_index) { 519 const char* known_version = "% VERSION 2"; 520 FILE* file = fopen(meta_index_path, "r"); 521 int line_no = 0; 522 #if INCLUDE_CDS 523 if (DumpSharedSpaces) { 524 if (file != NULL) { 525 _shared_paths_misc_info->add_required_file(meta_index_path); 526 } else { 527 _shared_paths_misc_info->add_nonexist_path(meta_index_path); 528 } 529 } 530 #endif 531 if (file != NULL) { 532 ResourceMark rm; 533 LazyClassPathEntry* cur_entry = NULL; 534 GrowableArray<char*> boot_class_path_packages(10); 535 char package_name[256]; 536 bool skipCurrentJar = false; 537 while (fgets(package_name, sizeof(package_name), file) != NULL) { 538 ++line_no; 539 // Remove trailing newline 540 package_name[strlen(package_name) - 1] = '\0'; 541 switch(package_name[0]) { 542 case '%': 543 { 544 if ((line_no == 1) && (strcmp(package_name, known_version) != 0)) { 545 if (TraceClassLoading && Verbose) { 546 tty->print("[Unsupported meta index version]"); 547 } 548 fclose(file); 549 return; 550 } 551 } 552 553 // These directives indicate jar files which contain only 554 // classes, only non-classfile resources, or a combination of 555 // the two. See src/share/classes/sun/misc/MetaIndex.java and 556 // make/tools/MetaIndex/BuildMetaIndex.java in the J2SE 557 // workspace. 558 case '#': 559 case '!': 560 case '@': 561 { 562 // Hand off current packages to current lazy entry (if any) 563 if ((cur_entry != NULL) && 564 (boot_class_path_packages.length() > 0)) { 565 if ((TraceClassLoading || TraceClassPaths) && Verbose) { 566 print_meta_index(cur_entry, boot_class_path_packages); 567 } 568 MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0), 569 boot_class_path_packages.length()); 570 cur_entry->set_meta_index(index); 571 } 572 cur_entry = NULL; 573 boot_class_path_packages.clear(); 574 575 // Find lazy entry corresponding to this jar file 576 int count = 0; 577 for (ClassPathEntry* entry = _first_entry; entry != NULL; entry = entry->next(), count++) { 578 if (count >= start_index && 579 entry->is_lazy() && 580 string_starts_with(entry->name(), meta_index_dir) && 581 string_ends_with(entry->name(), &package_name[2])) { 582 cur_entry = (LazyClassPathEntry*) entry; 583 break; 584 } 585 } 586 587 // If the first character is '@', it indicates the following jar 588 // file is a resource only jar file in which case, we should skip 589 // reading the subsequent entries since the resource loading is 590 // totally handled by J2SE side. 591 if (package_name[0] == '@') { 592 if (cur_entry != NULL) { 593 cur_entry->set_meta_index(new MetaIndex(NULL, 0)); 594 } 595 cur_entry = NULL; 596 skipCurrentJar = true; 597 } else { 598 skipCurrentJar = false; 599 } 600 601 break; 602 } 603 604 default: 605 { 606 if (!skipCurrentJar && cur_entry != NULL) { 607 char* new_name = os::strdup_check_oom(package_name); 608 boot_class_path_packages.append(new_name); 609 } 610 } 611 } 612 } 613 // Hand off current packages to current lazy entry (if any) 614 if ((cur_entry != NULL) && 615 (boot_class_path_packages.length() > 0)) { 616 if ((TraceClassLoading || TraceClassPaths) && Verbose) { 617 print_meta_index(cur_entry, boot_class_path_packages); 618 } 619 MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0), 620 boot_class_path_packages.length()); 621 cur_entry->set_meta_index(index); 622 } 623 fclose(file); 624 } 625 } 626 627 #if INCLUDE_CDS 628 void ClassLoader::check_shared_classpath(const char *path) { 629 if (strcmp(path, "") == 0) { 630 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL); 631 } 632 633 struct stat st; 634 if (os::stat(path, &st) == 0) { 635 if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory 636 if (!os::dir_is_empty(path)) { 637 tty->print_cr("Error: non-empty directory '%s'", path); 638 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL); 639 } 640 } 641 } 642 } 643 #endif 644 645 void ClassLoader::setup_bootstrap_search_path() { 646 assert(_first_entry == NULL, "should not setup bootstrap class search path twice"); 647 const char* sys_class_path = Arguments::get_sysclasspath(); 648 if (PrintSharedArchiveAndExit) { 649 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily 650 // the same as the bootcp of the shared archive. 651 } else { 652 trace_class_path("[Bootstrap loader class path=", sys_class_path); 653 } 654 #if INCLUDE_CDS 655 if (DumpSharedSpaces) { 656 _shared_paths_misc_info->add_boot_classpath(sys_class_path); 657 } 658 #endif 659 setup_search_path(sys_class_path); 660 } 661 662 #if INCLUDE_CDS 663 int ClassLoader::get_shared_paths_misc_info_size() { 664 return _shared_paths_misc_info->get_used_bytes(); 665 } 666 667 void* ClassLoader::get_shared_paths_misc_info() { 668 return _shared_paths_misc_info->buffer(); 669 } 670 671 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) { 672 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size); 673 bool result = checker->check(); 674 delete checker; 675 return result; 676 } 677 #endif 678 679 void ClassLoader::setup_search_path(const char *class_path) { 680 int offset = 0; 681 int len = (int)strlen(class_path); 682 int end = 0; 683 684 // Iterate over class path entries 685 for (int start = 0; start < len; start = end) { 686 while (class_path[end] && class_path[end] != os::path_separator()[0]) { 687 end++; 688 } 689 EXCEPTION_MARK; 690 ResourceMark rm(THREAD); 691 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1); 692 strncpy(path, &class_path[start], end - start); 693 path[end - start] = '\0'; 694 update_class_path_entry_list(path, false); 695 #if INCLUDE_CDS 696 if (DumpSharedSpaces) { 697 check_shared_classpath(path); 698 } 699 #endif 700 while (class_path[end] == os::path_separator()[0]) { 701 end++; 702 } 703 } 704 } 705 706 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st, 707 bool lazy, bool throw_exception, TRAPS) { 708 JavaThread* thread = JavaThread::current(); 709 if (lazy) { 710 return new LazyClassPathEntry(path, st, throw_exception); 711 } 712 ClassPathEntry* new_entry = NULL; 713 if ((st->st_mode & S_IFREG) == S_IFREG) { 714 // Regular file, should be a zip or image file 715 // Canonicalized filename 716 char canonical_path[JVM_MAXPATHLEN]; 717 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 718 // This matches the classic VM 719 if (throw_exception) { 720 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL); 721 } else { 722 return NULL; 723 } 724 } 725 // TODO - add proper criteria for selecting image file 726 ClassPathImageEntry* entry = new ClassPathImageEntry(canonical_path); 727 if (entry->is_open()) { 728 new_entry = entry; 729 } else { 730 char* error_msg = NULL; 731 jzfile* zip; 732 { 733 // enable call to C land 734 ThreadToNativeFromVM ttn(thread); 735 HandleMark hm(thread); 736 zip = (*ZipOpen)(canonical_path, &error_msg); 737 } 738 if (zip != NULL && error_msg == NULL) { 739 new_entry = new ClassPathZipEntry(zip, path); 740 } else { 741 ResourceMark rm(thread); 742 char *msg; 743 if (error_msg == NULL) { 744 msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ; 745 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path); 746 } else { 747 int len = (int)(strlen(path) + strlen(error_msg) + 128); 748 msg = NEW_RESOURCE_ARRAY(char, len); ; 749 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path); 750 } 751 if (throw_exception) { 752 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL); 753 } else { 754 return NULL; 755 } 756 } 757 } 758 if (TraceClassLoading || TraceClassPaths) { 759 tty->print_cr("[Opened %s]", path); 760 } 761 } else { 762 // Directory 763 new_entry = new ClassPathDirEntry(path); 764 if (TraceClassLoading) { 765 tty->print_cr("[Path %s]", path); 766 } 767 } 768 return new_entry; 769 } 770 771 772 // Create a class path zip entry for a given path (return NULL if not found 773 // or zip/JAR file cannot be opened) 774 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) { 775 // check for a regular file 776 struct stat st; 777 if (os::stat(path, &st) == 0) { 778 if ((st.st_mode & S_IFREG) == S_IFREG) { 779 char canonical_path[JVM_MAXPATHLEN]; 780 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 781 char* error_msg = NULL; 782 jzfile* zip; 783 { 784 // enable call to C land 785 JavaThread* thread = JavaThread::current(); 786 ThreadToNativeFromVM ttn(thread); 787 HandleMark hm(thread); 788 zip = (*ZipOpen)(canonical_path, &error_msg); 789 } 790 if (zip != NULL && error_msg == NULL) { 791 // create using canonical path 792 return new ClassPathZipEntry(zip, canonical_path); 793 } 794 } 795 } 796 } 797 return NULL; 798 } 799 800 // returns true if entry already on class path 801 bool ClassLoader::contains_entry(ClassPathEntry *entry) { 802 ClassPathEntry* e = _first_entry; 803 while (e != NULL) { 804 // assume zip entries have been canonicalized 805 if (strcmp(entry->name(), e->name()) == 0) { 806 return true; 807 } 808 e = e->next(); 809 } 810 return false; 811 } 812 813 void ClassLoader::add_to_list(ClassPathEntry *new_entry) { 814 if (new_entry != NULL) { 815 if (_last_entry == NULL) { 816 _first_entry = _last_entry = new_entry; 817 } else { 818 _last_entry->set_next(new_entry); 819 _last_entry = new_entry; 820 } 821 } 822 _num_entries ++; 823 } 824 825 // Returns true IFF the file/dir exists and the entry was successfully created. 826 bool ClassLoader::update_class_path_entry_list(const char *path, 827 bool check_for_duplicates, 828 bool throw_exception) { 829 struct stat st; 830 if (os::stat(path, &st) == 0) { 831 // File or directory found 832 ClassPathEntry* new_entry = NULL; 833 Thread* THREAD = Thread::current(); 834 new_entry = create_class_path_entry(path, &st, LazyBootClassLoader, throw_exception, CHECK_(false)); 835 if (new_entry == NULL) { 836 return false; 837 } 838 // The kernel VM adds dynamically to the end of the classloader path and 839 // doesn't reorder the bootclasspath which would break java.lang.Package 840 // (see PackageInfo). 841 // Add new entry to linked list 842 if (!check_for_duplicates || !contains_entry(new_entry)) { 843 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry); 844 } 845 return true; 846 } else { 847 #if INCLUDE_CDS 848 if (DumpSharedSpaces) { 849 _shared_paths_misc_info->add_nonexist_path(path); 850 } 851 #endif 852 return false; 853 } 854 } 855 856 void ClassLoader::print_bootclasspath() { 857 ClassPathEntry* e = _first_entry; 858 tty->print("[bootclasspath= "); 859 while (e != NULL) { 860 tty->print("%s ;", e->name()); 861 e = e->next(); 862 } 863 tty->print_cr("]"); 864 } 865 866 void ClassLoader::load_zip_library() { 867 assert(ZipOpen == NULL, "should not load zip library twice"); 868 // First make sure native library is loaded 869 os::native_java_library(); 870 // Load zip library 871 char path[JVM_MAXPATHLEN]; 872 char ebuf[1024]; 873 void* handle = NULL; 874 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) { 875 handle = os::dll_load(path, ebuf, sizeof ebuf); 876 } 877 if (handle == NULL) { 878 vm_exit_during_initialization("Unable to load ZIP library", path); 879 } 880 // Lookup zip entry points 881 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open")); 882 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close")); 883 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry")); 884 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry")); 885 ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry")); 886 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry")); 887 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully")); 888 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32")); 889 890 891 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL 892 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL || 893 GetNextEntry == NULL || Crc32 == NULL) { 894 vm_exit_during_initialization("Corrupted ZIP library", path); 895 } 896 897 if (ZipInflateFully == NULL) { 898 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path); 899 } 900 901 // Lookup canonicalize entry in libjava.dll 902 void *javalib_handle = os::native_java_library(); 903 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize")); 904 // This lookup only works on 1.3. Do not check for non-null here 905 } 906 907 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) { 908 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg); 909 } 910 911 int ClassLoader::crc32(int crc, const char* buf, int len) { 912 assert(Crc32 != NULL, "ZIP_CRC32 is not found"); 913 return (*Crc32)(crc, (const jbyte*)buf, len); 914 } 915 916 // PackageInfo data exists in order to support the java.lang.Package 917 // class. A Package object provides information about a java package 918 // (version, vendor, etc.) which originates in the manifest of the jar 919 // file supplying the package. For application classes, the ClassLoader 920 // object takes care of this. 921 922 // For system (boot) classes, the Java code in the Package class needs 923 // to be able to identify which source jar file contained the boot 924 // class, so that it can extract the manifest from it. This table 925 // identifies java packages with jar files in the boot classpath. 926 927 // Because the boot classpath cannot change, the classpath index is 928 // sufficient to identify the source jar file or directory. (Since 929 // directories have no manifests, the directory name is not required, 930 // but is available.) 931 932 // When using sharing -- the pathnames of entries in the boot classpath 933 // may not be the same at runtime as they were when the archive was 934 // created (NFS, Samba, etc.). The actual files and directories named 935 // in the classpath must be the same files, in the same order, even 936 // though the exact name is not the same. 937 938 class PackageInfo: public BasicHashtableEntry<mtClass> { 939 public: 940 const char* _pkgname; // Package name 941 int _classpath_index; // Index of directory or JAR file loaded from 942 943 PackageInfo* next() { 944 return (PackageInfo*)BasicHashtableEntry<mtClass>::next(); 945 } 946 947 const char* pkgname() { return _pkgname; } 948 void set_pkgname(char* pkgname) { _pkgname = pkgname; } 949 950 const char* filename() { 951 return ClassLoader::classpath_entry(_classpath_index)->name(); 952 } 953 954 void set_index(int index) { 955 _classpath_index = index; 956 } 957 }; 958 959 960 class PackageHashtable : public BasicHashtable<mtClass> { 961 private: 962 inline unsigned int compute_hash(const char *s, int n) { 963 unsigned int val = 0; 964 while (--n >= 0) { 965 val = *s++ + 31 * val; 966 } 967 return val; 968 } 969 970 PackageInfo* bucket(int index) { 971 return (PackageInfo*)BasicHashtable<mtClass>::bucket(index); 972 } 973 974 PackageInfo* get_entry(int index, unsigned int hash, 975 const char* pkgname, size_t n) { 976 for (PackageInfo* pp = bucket(index); pp != NULL; pp = pp->next()) { 977 if (pp->hash() == hash && 978 strncmp(pkgname, pp->pkgname(), n) == 0 && 979 pp->pkgname()[n] == '\0') { 980 return pp; 981 } 982 } 983 return NULL; 984 } 985 986 public: 987 PackageHashtable(int table_size) 988 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo)) {} 989 990 PackageHashtable(int table_size, HashtableBucket<mtClass>* t, int number_of_entries) 991 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo), t, number_of_entries) {} 992 993 PackageInfo* get_entry(const char* pkgname, int n) { 994 unsigned int hash = compute_hash(pkgname, n); 995 return get_entry(hash_to_index(hash), hash, pkgname, n); 996 } 997 998 PackageInfo* new_entry(char* pkgname, int n) { 999 unsigned int hash = compute_hash(pkgname, n); 1000 PackageInfo* pp; 1001 pp = (PackageInfo*)BasicHashtable<mtClass>::new_entry(hash); 1002 pp->set_pkgname(pkgname); 1003 return pp; 1004 } 1005 1006 void add_entry(PackageInfo* pp) { 1007 int index = hash_to_index(pp->hash()); 1008 BasicHashtable<mtClass>::add_entry(index, pp); 1009 } 1010 1011 void copy_pkgnames(const char** packages) { 1012 int n = 0; 1013 for (int i = 0; i < table_size(); ++i) { 1014 for (PackageInfo* pp = bucket(i); pp != NULL; pp = pp->next()) { 1015 packages[n++] = pp->pkgname(); 1016 } 1017 } 1018 assert(n == number_of_entries(), "just checking"); 1019 } 1020 1021 CDS_ONLY(void copy_table(char** top, char* end, PackageHashtable* table);) 1022 }; 1023 1024 #if INCLUDE_CDS 1025 void PackageHashtable::copy_table(char** top, char* end, 1026 PackageHashtable* table) { 1027 // Copy (relocate) the table to the shared space. 1028 BasicHashtable<mtClass>::copy_table(top, end); 1029 1030 // Calculate the space needed for the package name strings. 1031 int i; 1032 intptr_t* tableSize = (intptr_t*)(*top); 1033 *top += sizeof(intptr_t); // For table size 1034 char* tableStart = *top; 1035 1036 for (i = 0; i < table_size(); ++i) { 1037 for (PackageInfo* pp = table->bucket(i); 1038 pp != NULL; 1039 pp = pp->next()) { 1040 int n1 = (int)(strlen(pp->pkgname()) + 1); 1041 if (*top + n1 >= end) { 1042 report_out_of_shared_space(SharedMiscData); 1043 } 1044 pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1)); 1045 *top += n1; 1046 } 1047 } 1048 *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord)); 1049 if (*top >= end) { 1050 report_out_of_shared_space(SharedMiscData); 1051 } 1052 1053 // Write table size 1054 intptr_t len = *top - (char*)tableStart; 1055 *tableSize = len; 1056 } 1057 1058 1059 void ClassLoader::copy_package_info_buckets(char** top, char* end) { 1060 _package_hash_table->copy_buckets(top, end); 1061 } 1062 1063 void ClassLoader::copy_package_info_table(char** top, char* end) { 1064 _package_hash_table->copy_table(top, end, _package_hash_table); 1065 } 1066 #endif 1067 1068 PackageInfo* ClassLoader::lookup_package(const char *pkgname) { 1069 const char *cp = strrchr(pkgname, '/'); 1070 if (cp != NULL) { 1071 // Package prefix found 1072 int n = cp - pkgname + 1; 1073 return _package_hash_table->get_entry(pkgname, n); 1074 } 1075 return NULL; 1076 } 1077 1078 1079 bool ClassLoader::add_package(const char *pkgname, int classpath_index, TRAPS) { 1080 assert(pkgname != NULL, "just checking"); 1081 // Bootstrap loader no longer holds system loader lock obj serializing 1082 // load_instance_class and thereby add_package 1083 { 1084 MutexLocker ml(PackageTable_lock, THREAD); 1085 // First check for previously loaded entry 1086 PackageInfo* pp = lookup_package(pkgname); 1087 if (pp != NULL) { 1088 // Existing entry found, check source of package 1089 pp->set_index(classpath_index); 1090 return true; 1091 } 1092 1093 const char *cp = strrchr(pkgname, '/'); 1094 if (cp != NULL) { 1095 // Package prefix found 1096 int n = cp - pkgname + 1; 1097 1098 char* new_pkgname = NEW_C_HEAP_ARRAY(char, n + 1, mtClass); 1099 if (new_pkgname == NULL) { 1100 return false; 1101 } 1102 1103 memcpy(new_pkgname, pkgname, n); 1104 new_pkgname[n] = '\0'; 1105 pp = _package_hash_table->new_entry(new_pkgname, n); 1106 pp->set_index(classpath_index); 1107 1108 // Insert into hash table 1109 _package_hash_table->add_entry(pp); 1110 } 1111 return true; 1112 } 1113 } 1114 1115 1116 oop ClassLoader::get_system_package(const char* name, TRAPS) { 1117 PackageInfo* pp; 1118 { 1119 MutexLocker ml(PackageTable_lock, THREAD); 1120 pp = lookup_package(name); 1121 } 1122 if (pp == NULL) { 1123 return NULL; 1124 } else { 1125 Handle p = java_lang_String::create_from_str(pp->filename(), THREAD); 1126 return p(); 1127 } 1128 } 1129 1130 1131 objArrayOop ClassLoader::get_system_packages(TRAPS) { 1132 ResourceMark rm(THREAD); 1133 int nof_entries; 1134 const char** packages; 1135 { 1136 MutexLocker ml(PackageTable_lock, THREAD); 1137 // Allocate resource char* array containing package names 1138 nof_entries = _package_hash_table->number_of_entries(); 1139 if ((packages = NEW_RESOURCE_ARRAY(const char*, nof_entries)) == NULL) { 1140 return NULL; 1141 } 1142 _package_hash_table->copy_pkgnames(packages); 1143 } 1144 // Allocate objArray and fill with java.lang.String 1145 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), 1146 nof_entries, CHECK_0); 1147 objArrayHandle result(THREAD, r); 1148 for (int i = 0; i < nof_entries; i++) { 1149 Handle str = java_lang_String::create_from_str(packages[i], CHECK_0); 1150 result->obj_at_put(i, str()); 1151 } 1152 1153 return result(); 1154 } 1155 1156 1157 instanceKlassHandle ClassLoader::load_classfile(Symbol* h_name, TRAPS) { 1158 ResourceMark rm(THREAD); 1159 const char* class_name = h_name->as_C_string(); 1160 EventMark m("loading class %s", class_name); 1161 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion); 1162 1163 stringStream st; 1164 // st.print() uses too much stack space while handling a StackOverflowError 1165 // st.print("%s.class", h_name->as_utf8()); 1166 st.print_raw(h_name->as_utf8()); 1167 st.print_raw(".class"); 1168 const char* file_name = st.as_string(); 1169 ClassLoaderExt::Context context(class_name, file_name, THREAD); 1170 1171 // Lookup stream for parsing .class file 1172 ClassFileStream* stream = NULL; 1173 int classpath_index = 0; 1174 ClassPathEntry* e = NULL; 1175 instanceKlassHandle h; 1176 { 1177 PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(), 1178 ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(), 1179 PerfClassTraceTime::CLASS_LOAD); 1180 e = _first_entry; 1181 while (e != NULL) { 1182 stream = e->open_stream(file_name, CHECK_NULL); 1183 if (!context.check(stream, classpath_index)) { 1184 return h; // NULL 1185 } 1186 if (stream != NULL) { 1187 break; 1188 } 1189 e = e->next(); 1190 ++classpath_index; 1191 } 1192 } 1193 1194 if (stream != NULL) { 1195 // class file found, parse it 1196 ClassFileParser parser(stream); 1197 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 1198 Handle protection_domain; 1199 TempNewSymbol parsed_name = NULL; 1200 instanceKlassHandle result = parser.parseClassFile(h_name, 1201 loader_data, 1202 protection_domain, 1203 parsed_name, 1204 context.should_verify(classpath_index), 1205 THREAD); 1206 if (HAS_PENDING_EXCEPTION) { 1207 ResourceMark rm; 1208 if (DumpSharedSpaces) { 1209 tty->print_cr("Preload Error: Failed to load %s", class_name); 1210 } 1211 return h; 1212 } 1213 h = context.record_result(classpath_index, e, result, THREAD); 1214 } else { 1215 if (DumpSharedSpaces) { 1216 tty->print_cr("Preload Error: Cannot find %s", class_name); 1217 } 1218 } 1219 1220 return h; 1221 } 1222 1223 1224 void ClassLoader::create_package_info_table(HashtableBucket<mtClass> *t, int length, 1225 int number_of_entries) { 1226 assert(_package_hash_table == NULL, "One package info table allowed."); 1227 assert(length == package_hash_table_size * sizeof(HashtableBucket<mtClass>), 1228 "bad shared package info size."); 1229 _package_hash_table = new PackageHashtable(package_hash_table_size, t, 1230 number_of_entries); 1231 } 1232 1233 1234 void ClassLoader::create_package_info_table() { 1235 assert(_package_hash_table == NULL, "shouldn't have one yet"); 1236 _package_hash_table = new PackageHashtable(package_hash_table_size); 1237 } 1238 1239 1240 // Initialize the class loader's access to methods in libzip. Parse and 1241 // process the boot classpath into a list ClassPathEntry objects. Once 1242 // this list has been created, it must not change order (see class PackageInfo) 1243 // it can be appended to and is by jvmti and the kernel vm. 1244 1245 void ClassLoader::initialize() { 1246 assert(_package_hash_table == NULL, "should have been initialized by now."); 1247 EXCEPTION_MARK; 1248 1249 if (UsePerfData) { 1250 // jvmstat performance counters 1251 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time"); 1252 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime"); 1253 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self"); 1254 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime"); 1255 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self"); 1256 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime"); 1257 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self"); 1258 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses"); 1259 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses"); 1260 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses"); 1261 1262 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime"); 1263 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self"); 1264 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime"); 1265 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime"); 1266 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime"); 1267 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime"); 1268 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self"); 1269 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount"); 1270 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses"); 1271 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime"); 1272 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self"); 1273 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes"); 1274 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes"); 1275 1276 1277 // The following performance counters are added for measuring the impact 1278 // of the bug fix of 6365597. They are mainly focused on finding out 1279 // the behavior of system & user-defined classloader lock, whether 1280 // ClassLoader.loadClass/findClass is being called synchronized or not. 1281 // Also two additional counters are created to see whether 'UnsyncloadClass' 1282 // flag is being set or not and how many times load_instance_class call 1283 // fails with linkageError etc. 1284 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS, 1285 "systemLoaderLockContentionRate"); 1286 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS, 1287 "nonSystemLoaderLockContentionRate"); 1288 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS, 1289 "jvmFindLoadedClassNoLockCalls"); 1290 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS, 1291 "jvmDefineClassNoLockCalls"); 1292 1293 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS, 1294 "jniDefineClassNoLockCalls"); 1295 1296 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, 1297 "unsafeDefineClassCalls"); 1298 1299 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet"); 1300 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS, 1301 "loadInstanceClassFailRate"); 1302 1303 // increment the isUnsyncloadClass counter if UnsyncloadClass is set. 1304 if (UnsyncloadClass) { 1305 _isUnsyncloadClass->inc(); 1306 } 1307 } 1308 1309 // lookup zip library entry points 1310 load_zip_library(); 1311 #if INCLUDE_CDS 1312 // initialize search path 1313 if (DumpSharedSpaces) { 1314 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info(); 1315 } 1316 #endif 1317 setup_bootstrap_search_path(); 1318 if (LazyBootClassLoader) { 1319 // set up meta index which makes boot classpath initialization lazier 1320 setup_bootstrap_meta_index(); 1321 } 1322 } 1323 1324 #if INCLUDE_CDS 1325 void ClassLoader::initialize_shared_path() { 1326 if (DumpSharedSpaces) { 1327 ClassLoaderExt::setup_search_paths(); 1328 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check() 1329 } 1330 } 1331 #endif 1332 1333 jlong ClassLoader::classloader_time_ms() { 1334 return UsePerfData ? 1335 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1; 1336 } 1337 1338 jlong ClassLoader::class_init_count() { 1339 return UsePerfData ? _perf_classes_inited->get_value() : -1; 1340 } 1341 1342 jlong ClassLoader::class_init_time_ms() { 1343 return UsePerfData ? 1344 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1; 1345 } 1346 1347 jlong ClassLoader::class_verify_time_ms() { 1348 return UsePerfData ? 1349 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1; 1350 } 1351 1352 jlong ClassLoader::class_link_count() { 1353 return UsePerfData ? _perf_classes_linked->get_value() : -1; 1354 } 1355 1356 jlong ClassLoader::class_link_time_ms() { 1357 return UsePerfData ? 1358 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1; 1359 } 1360 1361 int ClassLoader::compute_Object_vtable() { 1362 // hardwired for JDK1.2 -- would need to duplicate class file parsing 1363 // code to determine actual value from file 1364 // Would be value '11' if finals were in vtable 1365 int JDK_1_2_Object_vtable_size = 5; 1366 return JDK_1_2_Object_vtable_size * vtableEntry::size(); 1367 } 1368 1369 1370 void classLoader_init() { 1371 ClassLoader::initialize(); 1372 } 1373 1374 1375 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) { 1376 assert(orig != NULL && out != NULL && len > 0, "bad arguments"); 1377 if (CanonicalizeEntry != NULL) { 1378 JavaThread* THREAD = JavaThread::current(); 1379 JNIEnv* env = THREAD->jni_environment(); 1380 ResourceMark rm(THREAD); 1381 1382 // os::native_path writes into orig_copy 1383 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1); 1384 strcpy(orig_copy, orig); 1385 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) { 1386 return false; 1387 } 1388 } else { 1389 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing 1390 strncpy(out, orig, len); 1391 out[len - 1] = '\0'; 1392 } 1393 return true; 1394 } 1395 1396 #ifndef PRODUCT 1397 1398 void ClassLoader::verify() { 1399 _package_hash_table->verify(); 1400 } 1401 1402 1403 // CompileTheWorld 1404 // 1405 // Iterates over all class path entries and forces compilation of all methods 1406 // in all classes found. Currently, only zip/jar archives are searched. 1407 // 1408 // The classes are loaded by the Java level bootstrap class loader, and the 1409 // initializer is called. If DelayCompilationDuringStartup is true (default), 1410 // the interpreter will run the initialization code. Note that forcing 1411 // initialization in this way could potentially lead to initialization order 1412 // problems, in which case we could just force the initialization bit to be set. 1413 1414 1415 // We need to iterate over the contents of a zip/jar file, so we replicate the 1416 // jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile, 1417 // since jzfile already has a void* definition. 1418 // 1419 // Note that this is only used in debug mode. 1420 // 1421 // HotSpot integration note: 1422 // Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build 1423 1424 1425 // JDK 1.3 version 1426 typedef struct real_jzentry { /* Zip file entry */ 1427 char *name; /* entry name */ 1428 jint time; /* modification time */ 1429 jint size; /* size of uncompressed data */ 1430 jint csize; /* size of compressed data (zero if uncompressed) */ 1431 jint crc; /* crc of uncompressed data */ 1432 char *comment; /* optional zip file comment */ 1433 jbyte *extra; /* optional extra data */ 1434 jint pos; /* position of LOC header (if negative) or data */ 1435 } real_jzentry; 1436 1437 typedef struct real_jzfile { /* Zip file */ 1438 char *name; /* zip file name */ 1439 jint refs; /* number of active references */ 1440 jint fd; /* open file descriptor */ 1441 void *lock; /* read lock */ 1442 char *comment; /* zip file comment */ 1443 char *msg; /* zip error message */ 1444 void *entries; /* array of hash cells */ 1445 jint total; /* total number of entries */ 1446 unsigned short *table; /* Hash chain heads: indexes into entries */ 1447 jint tablelen; /* number of hash eads */ 1448 real_jzfile *next; /* next zip file in search list */ 1449 jzentry *cache; /* we cache the most recently freed jzentry */ 1450 /* Information on metadata names in META-INF directory */ 1451 char **metanames; /* array of meta names (may have null names) */ 1452 jint metacount; /* number of slots in metanames array */ 1453 /* If there are any per-entry comments, they are in the comments array */ 1454 char **comments; 1455 } real_jzfile; 1456 1457 void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) { 1458 // For now we only compile all methods in all classes in zip/jar files 1459 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir); 1460 tty->cr(); 1461 } 1462 1463 1464 bool ClassPathDirEntry::is_jrt() { 1465 return false; 1466 } 1467 1468 void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) { 1469 real_jzfile* zip = (real_jzfile*) _zip; 1470 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name); 1471 tty->cr(); 1472 // Iterate over all entries in zip file 1473 for (int n = 0; ; n++) { 1474 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n)); 1475 if (ze == NULL) break; 1476 ClassLoader::compile_the_world_in(ze->name, loader, CHECK); 1477 } 1478 if (HAS_PENDING_EXCEPTION) { 1479 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1480 CLEAR_PENDING_EXCEPTION; 1481 tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); 1482 tty->print_cr("Increase class metadata storage if a limit was set"); 1483 } else { 1484 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); 1485 } 1486 } 1487 } 1488 1489 bool ClassPathZipEntry::is_jrt() { 1490 real_jzfile* zip = (real_jzfile*) _zip; 1491 int len = (int)strlen(zip->name); 1492 // Check whether zip name ends in "rt.jar" 1493 // This will match other archives named rt.jar as well, but this is 1494 // only used for debugging. 1495 return string_ends_with(zip->name, "rt.jar"); 1496 } 1497 1498 void LazyClassPathEntry::compile_the_world(Handle loader, TRAPS) { 1499 ClassPathEntry* cpe = resolve_entry(THREAD); 1500 if (cpe != NULL) { 1501 cpe->compile_the_world(loader, CHECK); 1502 } 1503 } 1504 1505 bool LazyClassPathEntry::is_jrt() { 1506 Thread* THREAD = Thread::current(); 1507 ClassPathEntry* cpe = resolve_entry(THREAD); 1508 return (cpe != NULL) ? cpe->is_jar_file() : false; 1509 } 1510 1511 void ClassLoader::compile_the_world() { 1512 EXCEPTION_MARK; 1513 HandleMark hm(THREAD); 1514 ResourceMark rm(THREAD); 1515 // Make sure we don't run with background compilation 1516 BackgroundCompilation = false; 1517 // Find bootstrap loader 1518 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader()); 1519 // Iterate over all bootstrap class path entries 1520 ClassPathEntry* e = _first_entry; 1521 jlong start = os::javaTimeMillis(); 1522 while (e != NULL) { 1523 // We stop at rt.jar, unless it is the first bootstrap path entry 1524 if (e->is_jrt() && e != _first_entry) break; 1525 e->compile_the_world(system_class_loader, CATCH); 1526 e = e->next(); 1527 } 1528 jlong end = os::javaTimeMillis(); 1529 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)", 1530 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start)); 1531 { 1532 // Print statistics as if before normal exit: 1533 extern void print_statistics(); 1534 print_statistics(); 1535 } 1536 vm_exit(0); 1537 } 1538 1539 int ClassLoader::_compile_the_world_class_counter = 0; 1540 int ClassLoader::_compile_the_world_method_counter = 0; 1541 static int _codecache_sweep_counter = 0; 1542 1543 // Filter out all exceptions except OOMs 1544 static void clear_pending_exception_if_not_oom(TRAPS) { 1545 if (HAS_PENDING_EXCEPTION && 1546 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1547 CLEAR_PENDING_EXCEPTION; 1548 } 1549 // The CHECK at the caller will propagate the exception out 1550 } 1551 1552 /** 1553 * Returns if the given method should be compiled when doing compile-the-world. 1554 * 1555 * TODO: This should be a private method in a CompileTheWorld class. 1556 */ 1557 static bool can_be_compiled(methodHandle m, int comp_level) { 1558 assert(CompileTheWorld, "must be"); 1559 1560 // It's not valid to compile a native wrapper for MethodHandle methods 1561 // that take a MemberName appendix since the bytecode signature is not 1562 // correct. 1563 vmIntrinsics::ID iid = m->intrinsic_id(); 1564 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) { 1565 return false; 1566 } 1567 1568 return CompilationPolicy::can_be_compiled(m, comp_level); 1569 } 1570 1571 void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) { 1572 if (string_ends_with(name, ".class")) { 1573 // We have a .class file 1574 int len = (int)strlen(name); 1575 char buffer[2048]; 1576 strncpy(buffer, name, len - 6); 1577 buffer[len-6] = 0; 1578 // If the file has a period after removing .class, it's not really a 1579 // valid class file. The class loader will check everything else. 1580 if (strchr(buffer, '.') == NULL) { 1581 _compile_the_world_class_counter++; 1582 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return; 1583 1584 // Construct name without extension 1585 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK); 1586 // Use loader to load and initialize class 1587 Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD); 1588 instanceKlassHandle k (THREAD, ik); 1589 if (k.not_null() && !HAS_PENDING_EXCEPTION) { 1590 k->initialize(THREAD); 1591 } 1592 bool exception_occurred = HAS_PENDING_EXCEPTION; 1593 clear_pending_exception_if_not_oom(CHECK); 1594 if (CompileTheWorldPreloadClasses && k.not_null()) { 1595 ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD); 1596 if (HAS_PENDING_EXCEPTION) { 1597 // If something went wrong in preloading we just ignore it 1598 clear_pending_exception_if_not_oom(CHECK); 1599 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer); 1600 } 1601 } 1602 1603 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) { 1604 if (k.is_null() || exception_occurred) { 1605 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class 1606 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer); 1607 } else { 1608 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer); 1609 // Preload all classes to get around uncommon traps 1610 // Iterate over all methods in class 1611 int comp_level = CompilationPolicy::policy()->initial_compile_level(); 1612 for (int n = 0; n < k->methods()->length(); n++) { 1613 methodHandle m (THREAD, k->methods()->at(n)); 1614 if (can_be_compiled(m, comp_level)) { 1615 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) { 1616 // Give sweeper a chance to keep up with CTW 1617 VM_ForceSafepoint op; 1618 VMThread::execute(&op); 1619 _codecache_sweep_counter = 0; 1620 } 1621 // Force compilation 1622 CompileBroker::compile_method(m, InvocationEntryBci, comp_level, 1623 methodHandle(), 0, "CTW", THREAD); 1624 if (HAS_PENDING_EXCEPTION) { 1625 clear_pending_exception_if_not_oom(CHECK); 1626 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1627 } else { 1628 _compile_the_world_method_counter++; 1629 } 1630 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) { 1631 // Clobber the first compile and force second tier compilation 1632 nmethod* nm = m->code(); 1633 if (nm != NULL && !m->is_method_handle_intrinsic()) { 1634 // Throw out the code so that the code cache doesn't fill up 1635 nm->make_not_entrant(); 1636 m->clear_code(); 1637 } 1638 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization, 1639 methodHandle(), 0, "CTW", THREAD); 1640 if (HAS_PENDING_EXCEPTION) { 1641 clear_pending_exception_if_not_oom(CHECK); 1642 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1643 } else { 1644 _compile_the_world_method_counter++; 1645 } 1646 } 1647 } else { 1648 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1649 } 1650 1651 nmethod* nm = m->code(); 1652 if (nm != NULL && !m->is_method_handle_intrinsic()) { 1653 // Throw out the code so that the code cache doesn't fill up 1654 nm->make_not_entrant(); 1655 m->clear_code(); 1656 } 1657 } 1658 } 1659 } 1660 } 1661 } 1662 } 1663 1664 #endif //PRODUCT 1665 1666 // Please keep following two functions at end of this file. With them placed at top or in middle of the file, 1667 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589. 1668 void PerfClassTraceTime::initialize() { 1669 if (!UsePerfData) return; 1670 1671 if (_eventp != NULL) { 1672 // increment the event counter 1673 _eventp->inc(); 1674 } 1675 1676 // stop the current active thread-local timer to measure inclusive time 1677 _prev_active_event = -1; 1678 for (int i=0; i < EVENT_TYPE_COUNT; i++) { 1679 if (_timers[i].is_active()) { 1680 assert(_prev_active_event == -1, "should have only one active timer"); 1681 _prev_active_event = i; 1682 _timers[i].stop(); 1683 } 1684 } 1685 1686 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) { 1687 // start the inclusive timer if not recursively called 1688 _t.start(); 1689 } 1690 1691 // start thread-local timer of the given event type 1692 if (!_timers[_event_type].is_active()) { 1693 _timers[_event_type].start(); 1694 } 1695 } 1696 1697 PerfClassTraceTime::~PerfClassTraceTime() { 1698 if (!UsePerfData) return; 1699 1700 // stop the thread-local timer as the event completes 1701 // and resume the thread-local timer of the event next on the stack 1702 _timers[_event_type].stop(); 1703 jlong selftime = _timers[_event_type].ticks(); 1704 1705 if (_prev_active_event >= 0) { 1706 _timers[_prev_active_event].start(); 1707 } 1708 1709 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return; 1710 1711 // increment the counters only on the leaf call 1712 _t.stop(); 1713 _timep->inc(_t.ticks()); 1714 if (_selftimep != NULL) { 1715 _selftimep->inc(selftime); 1716 } 1717 // add all class loading related event selftime to the accumulated time counter 1718 ClassLoader::perf_accumulated_time()->inc(selftime); 1719 1720 // reset the timer 1721 _timers[_event_type].reset(); 1722 } --- EOF ---