classLoader.cpp revision 9607:c8e212fb27d0
1/* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#include "precompiled.hpp" 26#include "classfile/classFileParser.hpp" 27#include "classfile/classFileStream.hpp" 28#include "classfile/classLoader.hpp" 29#include "classfile/classLoaderData.inline.hpp" 30#include "classfile/classLoaderExt.hpp" 31#include "classfile/javaClasses.hpp" 32#include "classfile/jimage.hpp" 33#include "classfile/systemDictionary.hpp" 34#include "classfile/vmSymbols.hpp" 35#include "compiler/compileBroker.hpp" 36#include "gc/shared/collectedHeap.inline.hpp" 37#include "gc/shared/generation.hpp" 38#include "interpreter/bytecodeStream.hpp" 39#include "interpreter/oopMapCache.hpp" 40#include "memory/allocation.inline.hpp" 41#include "memory/filemap.hpp" 42#include "memory/oopFactory.hpp" 43#include "memory/universe.inline.hpp" 44#include "oops/instanceKlass.hpp" 45#include "oops/instanceRefKlass.hpp" 46#include "oops/oop.inline.hpp" 47#include "oops/symbol.hpp" 48#include "prims/jvm_misc.hpp" 49#include "runtime/arguments.hpp" 50#include "runtime/compilationPolicy.hpp" 51#include "runtime/fprofiler.hpp" 52#include "runtime/handles.hpp" 53#include "runtime/handles.inline.hpp" 54#include "runtime/init.hpp" 55#include "runtime/interfaceSupport.hpp" 56#include "runtime/java.hpp" 57#include "runtime/javaCalls.hpp" 58#include "runtime/os.hpp" 59#include "runtime/threadCritical.hpp" 60#include "runtime/timer.hpp" 61#include "runtime/vm_version.hpp" 62#include "services/management.hpp" 63#include "services/threadService.hpp" 64#include "utilities/events.hpp" 65#include "utilities/hashtable.inline.hpp" 66#include "utilities/macros.hpp" 67#if INCLUDE_CDS 68#include "classfile/sharedClassUtil.hpp" 69#include "classfile/sharedPathsMiscInfo.hpp" 70#endif 71 72// Entry points in zip.dll for loading zip/jar file entries 73 74typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg); 75typedef void (JNICALL *ZipClose_t)(jzfile *zip); 76typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen); 77typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf); 78typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf); 79typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n); 80typedef jboolean (JNICALL *ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg); 81typedef jint (JNICALL *Crc32_t)(jint crc, const jbyte *buf, jint len); 82 83static ZipOpen_t ZipOpen = NULL; 84static ZipClose_t ZipClose = NULL; 85static FindEntry_t FindEntry = NULL; 86static ReadEntry_t ReadEntry = NULL; 87static ReadMappedEntry_t ReadMappedEntry = NULL; 88static GetNextEntry_t GetNextEntry = NULL; 89static canonicalize_fn_t CanonicalizeEntry = NULL; 90static ZipInflateFully_t ZipInflateFully = NULL; 91static Crc32_t Crc32 = NULL; 92 93// Entry points for jimage.dll for loading jimage file entries 94 95static JImageOpen_t JImageOpen = NULL; 96static JImageClose_t JImageClose = NULL; 97static JImagePackageToModule_t JImagePackageToModule = NULL; 98static JImageFindResource_t JImageFindResource = NULL; 99static JImageGetResource_t JImageGetResource = NULL; 100static JImageResourceIterator_t JImageResourceIterator = NULL; 101 102// Globals 103 104PerfCounter* ClassLoader::_perf_accumulated_time = NULL; 105PerfCounter* ClassLoader::_perf_classes_inited = NULL; 106PerfCounter* ClassLoader::_perf_class_init_time = NULL; 107PerfCounter* ClassLoader::_perf_class_init_selftime = NULL; 108PerfCounter* ClassLoader::_perf_classes_verified = NULL; 109PerfCounter* ClassLoader::_perf_class_verify_time = NULL; 110PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL; 111PerfCounter* ClassLoader::_perf_classes_linked = NULL; 112PerfCounter* ClassLoader::_perf_class_link_time = NULL; 113PerfCounter* ClassLoader::_perf_class_link_selftime = NULL; 114PerfCounter* ClassLoader::_perf_class_parse_time = NULL; 115PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL; 116PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL; 117PerfCounter* ClassLoader::_perf_shared_classload_time = NULL; 118PerfCounter* ClassLoader::_perf_sys_classload_time = NULL; 119PerfCounter* ClassLoader::_perf_app_classload_time = NULL; 120PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL; 121PerfCounter* ClassLoader::_perf_app_classload_count = NULL; 122PerfCounter* ClassLoader::_perf_define_appclasses = NULL; 123PerfCounter* ClassLoader::_perf_define_appclass_time = NULL; 124PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL; 125PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL; 126PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL; 127PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL; 128PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL; 129PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL; 130PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL; 131PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL; 132PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL; 133PerfCounter* ClassLoader::_isUnsyncloadClass = NULL; 134PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL; 135 136ClassPathEntry* ClassLoader::_first_entry = NULL; 137ClassPathEntry* ClassLoader::_last_entry = NULL; 138int ClassLoader::_num_entries = 0; 139PackageHashtable* ClassLoader::_package_hash_table = NULL; 140 141#if INCLUDE_CDS 142SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL; 143#endif 144// helper routines 145bool string_starts_with(const char* str, const char* str_to_find) { 146 size_t str_len = strlen(str); 147 size_t str_to_find_len = strlen(str_to_find); 148 if (str_to_find_len > str_len) { 149 return false; 150 } 151 return (strncmp(str, str_to_find, str_to_find_len) == 0); 152} 153 154static const char* get_jimage_version_string() { 155 static char version_string[10] = ""; 156 if (version_string[0] == '\0') { 157 jio_snprintf(version_string, sizeof(version_string), "%d.%d", 158 Abstract_VM_Version::vm_major_version(), Abstract_VM_Version::vm_minor_version()); 159 } 160 return (const char*)version_string; 161} 162 163bool string_ends_with(const char* str, const char* str_to_find) { 164 size_t str_len = strlen(str); 165 size_t str_to_find_len = strlen(str_to_find); 166 if (str_to_find_len > str_len) { 167 return false; 168 } 169 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0); 170} 171 172 173ClassPathEntry::ClassPathEntry() { 174 set_next(NULL); 175} 176 177 178ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() { 179 char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass); 180 strcpy(copy, dir); 181 _dir = copy; 182} 183 184ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) { 185 // construct full path name 186 char path[JVM_MAXPATHLEN]; 187 if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) { 188 return NULL; 189 } 190 // check if file exists 191 struct stat st; 192 if (os::stat(path, &st) == 0) { 193#if INCLUDE_CDS 194 if (DumpSharedSpaces) { 195 // We have already check in ClassLoader::check_shared_classpath() that the directory is empty, so 196 // we should never find a file underneath it -- unless user has added a new file while we are running 197 // the dump, in which case let's quit! 198 ShouldNotReachHere(); 199 } 200#endif 201 // found file, open it 202 int file_handle = os::open(path, 0, 0); 203 if (file_handle != -1) { 204 // read contents into resource array 205 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size); 206 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size); 207 // close file 208 os::close(file_handle); 209 // construct ClassFileStream 210 if (num_read == (size_t)st.st_size) { 211 if (UsePerfData) { 212 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read); 213 } 214 return new ClassFileStream(buffer, st.st_size, _dir); // Resource allocated 215 } 216 } 217 } 218 return NULL; 219} 220 221 222ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() { 223 _zip = zip; 224 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass); 225 strcpy(copy, zip_name); 226 _zip_name = copy; 227} 228 229ClassPathZipEntry::~ClassPathZipEntry() { 230 if (ZipClose != NULL) { 231 (*ZipClose)(_zip); 232 } 233 FREE_C_HEAP_ARRAY(char, _zip_name); 234} 235 236u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) { 237 // enable call to C land 238 JavaThread* thread = JavaThread::current(); 239 ThreadToNativeFromVM ttn(thread); 240 // check whether zip archive contains name 241 jint name_len; 242 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len); 243 if (entry == NULL) return NULL; 244 u1* buffer; 245 char name_buf[128]; 246 char* filename; 247 if (name_len < 128) { 248 filename = name_buf; 249 } else { 250 filename = NEW_RESOURCE_ARRAY(char, name_len + 1); 251 } 252 253 // file found, get pointer to the entry in mmapped jar file. 254 if (ReadMappedEntry == NULL || 255 !(*ReadMappedEntry)(_zip, entry, &buffer, filename)) { 256 // mmapped access not available, perhaps due to compression, 257 // read contents into resource array 258 int size = (*filesize) + ((nul_terminate) ? 1 : 0); 259 buffer = NEW_RESOURCE_ARRAY(u1, size); 260 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL; 261 } 262 263 // return result 264 if (nul_terminate) { 265 buffer[*filesize] = 0; 266 } 267 return buffer; 268} 269 270ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) { 271 jint filesize; 272 u1* buffer = open_entry(name, &filesize, false, CHECK_NULL); 273 if (buffer == NULL) { 274 return NULL; 275 } 276 if (UsePerfData) { 277 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize); 278 } 279 return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated 280} 281 282// invoke function for each entry in the zip file 283void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) { 284 JavaThread* thread = JavaThread::current(); 285 HandleMark handle_mark(thread); 286 ThreadToNativeFromVM ttn(thread); 287 for (int n = 0; ; n++) { 288 jzentry * ze = ((*GetNextEntry)(_zip, n)); 289 if (ze == NULL) break; 290 (*f)(ze->name, context); 291 } 292} 293 294ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) : 295 ClassPathEntry(), 296 _jimage(jimage) { 297 guarantee(jimage != NULL, "jimage file is null"); 298 guarantee(name != NULL, "jimage file name is null"); 299 size_t len = strlen(name) + 1; 300 _name = NEW_C_HEAP_ARRAY(const char, len, mtClass); 301 strncpy((char *)_name, name, len); 302} 303 304ClassPathImageEntry::~ClassPathImageEntry() { 305 if (_name != NULL) { 306 FREE_C_HEAP_ARRAY(const char, _name); 307 _name = NULL; 308 } 309 if (_jimage != NULL) { 310 (*JImageClose)(_jimage); 311 _jimage = NULL; 312 } 313} 314 315void ClassPathImageEntry::name_to_package(const char* name, char* buffer, int length) { 316 const char *pslash = strrchr(name, '/'); 317 if (pslash == NULL) { 318 buffer[0] = '\0'; 319 return; 320 } 321 int len = pslash - name; 322#if INCLUDE_CDS 323 if (len <= 0 && DumpSharedSpaces) { 324 buffer[0] = '\0'; 325 return; 326 } 327#endif 328 assert(len > 0, "Bad length for package name"); 329 if (len >= length) { 330 buffer[0] = '\0'; 331 return; 332 } 333 // drop name after last slash (including slash) 334 // Ex., "java/lang/String.class" => "java/lang" 335 strncpy(buffer, name, len); 336 // ensure string termination (strncpy does not guarantee) 337 buffer[len] = '\0'; 338} 339 340// For a class in a named module, look it up in the jimage file using this syntax: 341// /<module-name>/<package-name>/<base-class> 342// 343// Assumptions: 344// 1. There are no unnamed modules in the jimage file. 345// 2. A package is in at most one module in the jimage file. 346// 347ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) { 348 jlong size; 349 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size); 350 351 if (location == 0) { 352 char package[JIMAGE_MAX_PATH]; 353 name_to_package(name, package, JIMAGE_MAX_PATH); 354 if (package[0] != '\0') { 355 const char* module = (*JImagePackageToModule)(_jimage, package); 356 if (module == NULL) { 357 module = "java.base"; 358 } 359 location = (*JImageFindResource)(_jimage, module, get_jimage_version_string(), name, &size); 360 } 361 } 362 363 if (location != 0) { 364 if (UsePerfData) { 365 ClassLoader::perf_sys_classfile_bytes_read()->inc(size); 366 } 367 char* data = NEW_RESOURCE_ARRAY(char, size); 368 (*JImageGetResource)(_jimage, location, data, size); 369 return new ClassFileStream((u1*)data, (int)size, _name); // Resource allocated 370 } 371 372 return NULL; 373} 374 375#ifndef PRODUCT 376bool ctw_visitor(JImageFile* jimage, 377 const char* module_name, const char* version, const char* package, 378 const char* name, const char* extension, void* arg) { 379 if (strcmp(extension, "class") == 0) { 380 Thread* THREAD = Thread::current(); 381 char path[JIMAGE_MAX_PATH]; 382 jio_snprintf(path, JIMAGE_MAX_PATH - 1, "%s/%s.class", package, name); 383 ClassLoader::compile_the_world_in(path, *(Handle*)arg, THREAD); 384 return !HAS_PENDING_EXCEPTION; 385 } 386 return true; 387} 388 389void ClassPathImageEntry::compile_the_world(Handle loader, TRAPS) { 390 tty->print_cr("CompileTheWorld : Compiling all classes in %s", name()); 391 tty->cr(); 392 (*JImageResourceIterator)(_jimage, (JImageResourceVisitor_t)ctw_visitor, (void *)&loader); 393 if (HAS_PENDING_EXCEPTION) { 394 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 395 CLEAR_PENDING_EXCEPTION; 396 tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); 397 tty->print_cr("Increase class metadata storage if a limit was set"); 398 } else { 399 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); 400 } 401 } 402} 403 404bool ClassPathImageEntry::is_jrt() { 405 return string_ends_with(name(), BOOT_IMAGE_NAME); 406} 407#endif 408 409#if INCLUDE_CDS 410void 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 417void 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#if INCLUDE_CDS 445void ClassLoader::check_shared_classpath(const char *path) { 446 if (strcmp(path, "") == 0) { 447 exit_with_path_failure("Cannot have empty path in archived classpaths", NULL); 448 } 449 450 struct stat st; 451 if (os::stat(path, &st) == 0) { 452 if ((st.st_mode & S_IFREG) != S_IFREG) { // is directory 453 if (!os::dir_is_empty(path)) { 454 tty->print_cr("Error: non-empty directory '%s'", path); 455 exit_with_path_failure("CDS allows only empty directories in archived classpaths", NULL); 456 } 457 } 458 } 459} 460#endif 461 462void ClassLoader::setup_bootstrap_search_path() { 463 assert(_first_entry == NULL, "should not setup bootstrap class search path twice"); 464 const char* sys_class_path = Arguments::get_sysclasspath(); 465 if (PrintSharedArchiveAndExit) { 466 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily 467 // the same as the bootcp of the shared archive. 468 } else { 469 trace_class_path(tty, "[Bootstrap loader class path=", sys_class_path); 470 } 471#if INCLUDE_CDS 472 if (DumpSharedSpaces) { 473 _shared_paths_misc_info->add_boot_classpath(sys_class_path); 474 } 475#endif 476 setup_search_path(sys_class_path); 477} 478 479#if INCLUDE_CDS 480int ClassLoader::get_shared_paths_misc_info_size() { 481 return _shared_paths_misc_info->get_used_bytes(); 482} 483 484void* ClassLoader::get_shared_paths_misc_info() { 485 return _shared_paths_misc_info->buffer(); 486} 487 488bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) { 489 SharedPathsMiscInfo* checker = SharedClassUtil::allocate_shared_paths_misc_info((char*)buf, size); 490 bool result = checker->check(); 491 delete checker; 492 return result; 493} 494#endif 495 496void ClassLoader::setup_search_path(const char *class_path) { 497 int offset = 0; 498 int len = (int)strlen(class_path); 499 int end = 0; 500 501 // Iterate over class path entries 502 for (int start = 0; start < len; start = end) { 503 while (class_path[end] && class_path[end] != os::path_separator()[0]) { 504 end++; 505 } 506 EXCEPTION_MARK; 507 ResourceMark rm(THREAD); 508 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1); 509 strncpy(path, &class_path[start], end - start); 510 path[end - start] = '\0'; 511 update_class_path_entry_list(path, false); 512#if INCLUDE_CDS 513 if (DumpSharedSpaces) { 514 check_shared_classpath(path); 515 } 516#endif 517 while (class_path[end] == os::path_separator()[0]) { 518 end++; 519 } 520 } 521} 522 523ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st, 524 bool throw_exception, TRAPS) { 525 JavaThread* thread = JavaThread::current(); 526 ClassPathEntry* new_entry = NULL; 527 if ((st->st_mode & S_IFREG) == S_IFREG) { 528 // Regular file, should be a zip or jimage file 529 // Canonicalized filename 530 char canonical_path[JVM_MAXPATHLEN]; 531 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 532 // This matches the classic VM 533 if (throw_exception) { 534 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL); 535 } else { 536 return NULL; 537 } 538 } 539 jint error; 540 JImageFile* jimage =(*JImageOpen)(canonical_path, &error); 541 if (jimage != NULL) { 542 new_entry = new ClassPathImageEntry(jimage, canonical_path); 543 } else { 544 char* error_msg = NULL; 545 jzfile* zip; 546 { 547 // enable call to C land 548 ThreadToNativeFromVM ttn(thread); 549 HandleMark hm(thread); 550 zip = (*ZipOpen)(canonical_path, &error_msg); 551 } 552 if (zip != NULL && error_msg == NULL) { 553 new_entry = new ClassPathZipEntry(zip, path); 554 } else { 555 ResourceMark rm(thread); 556 char *msg; 557 if (error_msg == NULL) { 558 msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ; 559 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path); 560 } else { 561 int len = (int)(strlen(path) + strlen(error_msg) + 128); 562 msg = NEW_RESOURCE_ARRAY(char, len); ; 563 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path); 564 } 565 // Don't complain about bad jar files added via -Xbootclasspath/a:. 566 if (throw_exception && is_init_completed()) { 567 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL); 568 } else { 569 return NULL; 570 } 571 } 572 } 573 if (TraceClassLoading || TraceClassPaths) { 574 tty->print_cr("[Opened %s]", path); 575 } 576 } else { 577 // Directory 578 new_entry = new ClassPathDirEntry(path); 579 if (TraceClassLoading) { 580 tty->print_cr("[Path %s]", path); 581 } 582 } 583 return new_entry; 584} 585 586 587// Create a class path zip entry for a given path (return NULL if not found 588// or zip/JAR file cannot be opened) 589ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) { 590 // check for a regular file 591 struct stat st; 592 if (os::stat(path, &st) == 0) { 593 if ((st.st_mode & S_IFREG) == S_IFREG) { 594 char canonical_path[JVM_MAXPATHLEN]; 595 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) { 596 char* error_msg = NULL; 597 jzfile* zip; 598 { 599 // enable call to C land 600 JavaThread* thread = JavaThread::current(); 601 ThreadToNativeFromVM ttn(thread); 602 HandleMark hm(thread); 603 zip = (*ZipOpen)(canonical_path, &error_msg); 604 } 605 if (zip != NULL && error_msg == NULL) { 606 // create using canonical path 607 return new ClassPathZipEntry(zip, canonical_path); 608 } 609 } 610 } 611 } 612 return NULL; 613} 614 615// returns true if entry already on class path 616bool ClassLoader::contains_entry(ClassPathEntry *entry) { 617 ClassPathEntry* e = _first_entry; 618 while (e != NULL) { 619 // assume zip entries have been canonicalized 620 if (strcmp(entry->name(), e->name()) == 0) { 621 return true; 622 } 623 e = e->next(); 624 } 625 return false; 626} 627 628void ClassLoader::add_to_list(ClassPathEntry *new_entry) { 629 if (new_entry != NULL) { 630 if (_last_entry == NULL) { 631 _first_entry = _last_entry = new_entry; 632 } else { 633 _last_entry->set_next(new_entry); 634 _last_entry = new_entry; 635 } 636 } 637 _num_entries ++; 638} 639 640// Returns true IFF the file/dir exists and the entry was successfully created. 641bool ClassLoader::update_class_path_entry_list(const char *path, 642 bool check_for_duplicates, 643 bool throw_exception) { 644 struct stat st; 645 if (os::stat(path, &st) == 0) { 646 // File or directory found 647 ClassPathEntry* new_entry = NULL; 648 Thread* THREAD = Thread::current(); 649 new_entry = create_class_path_entry(path, &st, throw_exception, CHECK_(false)); 650 if (new_entry == NULL) { 651 return false; 652 } 653 // The kernel VM adds dynamically to the end of the classloader path and 654 // doesn't reorder the bootclasspath which would break java.lang.Package 655 // (see PackageInfo). 656 // Add new entry to linked list 657 if (!check_for_duplicates || !contains_entry(new_entry)) { 658 ClassLoaderExt::add_class_path_entry(path, check_for_duplicates, new_entry); 659 } 660 return true; 661 } else { 662#if INCLUDE_CDS 663 if (DumpSharedSpaces) { 664 _shared_paths_misc_info->add_nonexist_path(path); 665 } 666#endif 667 return false; 668 } 669} 670 671void ClassLoader::print_bootclasspath() { 672 ClassPathEntry* e = _first_entry; 673 tty->print("[bootclasspath= "); 674 while (e != NULL) { 675 tty->print("%s ;", e->name()); 676 e = e->next(); 677 } 678 tty->print_cr("]"); 679} 680 681void ClassLoader::load_zip_library() { 682 assert(ZipOpen == NULL, "should not load zip library twice"); 683 // First make sure native library is loaded 684 os::native_java_library(); 685 // Load zip library 686 char path[JVM_MAXPATHLEN]; 687 char ebuf[1024]; 688 void* handle = NULL; 689 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip")) { 690 handle = os::dll_load(path, ebuf, sizeof ebuf); 691 } 692 if (handle == NULL) { 693 vm_exit_during_initialization("Unable to load ZIP library", path); 694 } 695 // Lookup zip entry points 696 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open")); 697 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close")); 698 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry")); 699 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry")); 700 ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, os::dll_lookup(handle, "ZIP_ReadMappedEntry")); 701 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry")); 702 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully")); 703 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32")); 704 705 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL 706 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL || 707 GetNextEntry == NULL || Crc32 == NULL) { 708 vm_exit_during_initialization("Corrupted ZIP library", path); 709 } 710 711 if (ZipInflateFully == NULL) { 712 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path); 713 } 714 715 // Lookup canonicalize entry in libjava.dll 716 void *javalib_handle = os::native_java_library(); 717 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize")); 718 // This lookup only works on 1.3. Do not check for non-null here 719} 720 721void ClassLoader::load_jimage_library() { 722 // First make sure native library is loaded 723 os::native_java_library(); 724 // Load jimage library 725 char path[JVM_MAXPATHLEN]; 726 char ebuf[1024]; 727 void* handle = NULL; 728 if (os::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) { 729 handle = os::dll_load(path, ebuf, sizeof ebuf); 730 } 731 if (handle == NULL) { 732 vm_exit_during_initialization("Unable to load jimage library", path); 733 } 734 735 // Lookup jimage entry points 736 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open")); 737 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found"); 738 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close")); 739 guarantee(JImageClose != NULL, "function JIMAGE_Close not found"); 740 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule")); 741 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found"); 742 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource")); 743 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found"); 744 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource")); 745 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found"); 746 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator")); 747 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found"); 748} 749 750jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) { 751 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg); 752} 753 754int ClassLoader::crc32(int crc, const char* buf, int len) { 755 assert(Crc32 != NULL, "ZIP_CRC32 is not found"); 756 return (*Crc32)(crc, (const jbyte*)buf, len); 757} 758 759// PackageInfo data exists in order to support the java.lang.Package 760// class. A Package object provides information about a java package 761// (version, vendor, etc.) which originates in the manifest of the jar 762// file supplying the package. For application classes, the ClassLoader 763// object takes care of this. 764 765// For system (boot) classes, the Java code in the Package class needs 766// to be able to identify which source jar file contained the boot 767// class, so that it can extract the manifest from it. This table 768// identifies java packages with jar files in the boot classpath. 769 770// Because the boot classpath cannot change, the classpath index is 771// sufficient to identify the source jar file or directory. (Since 772// directories have no manifests, the directory name is not required, 773// but is available.) 774 775// When using sharing -- the pathnames of entries in the boot classpath 776// may not be the same at runtime as they were when the archive was 777// created (NFS, Samba, etc.). The actual files and directories named 778// in the classpath must be the same files, in the same order, even 779// though the exact name is not the same. 780 781class PackageInfo: public BasicHashtableEntry<mtClass> { 782public: 783 const char* _pkgname; // Package name 784 int _classpath_index; // Index of directory or JAR file loaded from 785 786 PackageInfo* next() { 787 return (PackageInfo*)BasicHashtableEntry<mtClass>::next(); 788 } 789 790 const char* pkgname() { return _pkgname; } 791 void set_pkgname(char* pkgname) { _pkgname = pkgname; } 792 793 const char* filename() { 794 return ClassLoader::classpath_entry(_classpath_index)->name(); 795 } 796 797 void set_index(int index) { 798 _classpath_index = index; 799 } 800}; 801 802 803class PackageHashtable : public BasicHashtable<mtClass> { 804private: 805 inline unsigned int compute_hash(const char *s, int n) { 806 unsigned int val = 0; 807 while (--n >= 0) { 808 val = *s++ + 31 * val; 809 } 810 return val; 811 } 812 813 PackageInfo* bucket(int index) { 814 return (PackageInfo*)BasicHashtable<mtClass>::bucket(index); 815 } 816 817 PackageInfo* get_entry(int index, unsigned int hash, 818 const char* pkgname, size_t n) { 819 for (PackageInfo* pp = bucket(index); pp != NULL; pp = pp->next()) { 820 if (pp->hash() == hash && 821 strncmp(pkgname, pp->pkgname(), n) == 0 && 822 pp->pkgname()[n] == '\0') { 823 return pp; 824 } 825 } 826 return NULL; 827 } 828 829public: 830 PackageHashtable(int table_size) 831 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo)) {} 832 833 PackageHashtable(int table_size, HashtableBucket<mtClass>* t, int number_of_entries) 834 : BasicHashtable<mtClass>(table_size, sizeof(PackageInfo), t, number_of_entries) {} 835 836 PackageInfo* get_entry(const char* pkgname, int n) { 837 unsigned int hash = compute_hash(pkgname, n); 838 return get_entry(hash_to_index(hash), hash, pkgname, n); 839 } 840 841 PackageInfo* new_entry(char* pkgname, int n) { 842 unsigned int hash = compute_hash(pkgname, n); 843 PackageInfo* pp; 844 pp = (PackageInfo*)BasicHashtable<mtClass>::new_entry(hash); 845 pp->set_pkgname(pkgname); 846 return pp; 847 } 848 849 void add_entry(PackageInfo* pp) { 850 int index = hash_to_index(pp->hash()); 851 BasicHashtable<mtClass>::add_entry(index, pp); 852 } 853 854 void copy_pkgnames(const char** packages) { 855 int n = 0; 856 for (int i = 0; i < table_size(); ++i) { 857 for (PackageInfo* pp = bucket(i); pp != NULL; pp = pp->next()) { 858 packages[n++] = pp->pkgname(); 859 } 860 } 861 assert(n == number_of_entries(), "just checking"); 862 } 863 864 CDS_ONLY(void copy_table(char** top, char* end, PackageHashtable* table);) 865}; 866 867#if INCLUDE_CDS 868void PackageHashtable::copy_table(char** top, char* end, 869 PackageHashtable* table) { 870 // Copy (relocate) the table to the shared space. 871 BasicHashtable<mtClass>::copy_table(top, end); 872 873 // Calculate the space needed for the package name strings. 874 int i; 875 intptr_t* tableSize = (intptr_t*)(*top); 876 *top += sizeof(intptr_t); // For table size 877 char* tableStart = *top; 878 879 for (i = 0; i < table_size(); ++i) { 880 for (PackageInfo* pp = table->bucket(i); 881 pp != NULL; 882 pp = pp->next()) { 883 int n1 = (int)(strlen(pp->pkgname()) + 1); 884 if (*top + n1 >= end) { 885 report_out_of_shared_space(SharedMiscData); 886 } 887 pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1)); 888 *top += n1; 889 } 890 } 891 *top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord)); 892 if (*top >= end) { 893 report_out_of_shared_space(SharedMiscData); 894 } 895 896 // Write table size 897 intptr_t len = *top - (char*)tableStart; 898 *tableSize = len; 899} 900 901 902void ClassLoader::copy_package_info_buckets(char** top, char* end) { 903 _package_hash_table->copy_buckets(top, end); 904} 905 906void ClassLoader::copy_package_info_table(char** top, char* end) { 907 _package_hash_table->copy_table(top, end, _package_hash_table); 908} 909#endif 910 911PackageInfo* ClassLoader::lookup_package(const char *pkgname) { 912 const char *cp = strrchr(pkgname, '/'); 913 if (cp != NULL) { 914 // Package prefix found 915 int n = cp - pkgname + 1; 916 return _package_hash_table->get_entry(pkgname, n); 917 } 918 return NULL; 919} 920 921 922bool ClassLoader::add_package(const char *pkgname, int classpath_index, TRAPS) { 923 assert(pkgname != NULL, "just checking"); 924 // Bootstrap loader no longer holds system loader lock obj serializing 925 // load_instance_class and thereby add_package 926 { 927 MutexLocker ml(PackageTable_lock, THREAD); 928 // First check for previously loaded entry 929 PackageInfo* pp = lookup_package(pkgname); 930 if (pp != NULL) { 931 // Existing entry found, check source of package 932 pp->set_index(classpath_index); 933 return true; 934 } 935 936 const char *cp = strrchr(pkgname, '/'); 937 if (cp != NULL) { 938 // Package prefix found 939 int n = cp - pkgname + 1; 940 941 char* new_pkgname = NEW_C_HEAP_ARRAY(char, n + 1, mtClass); 942 if (new_pkgname == NULL) { 943 return false; 944 } 945 946 memcpy(new_pkgname, pkgname, n); 947 new_pkgname[n] = '\0'; 948 pp = _package_hash_table->new_entry(new_pkgname, n); 949 pp->set_index(classpath_index); 950 951 // Insert into hash table 952 _package_hash_table->add_entry(pp); 953 } 954 return true; 955 } 956} 957 958 959oop ClassLoader::get_system_package(const char* name, TRAPS) { 960 PackageInfo* pp; 961 { 962 MutexLocker ml(PackageTable_lock, THREAD); 963 pp = lookup_package(name); 964 } 965 if (pp == NULL) { 966 return NULL; 967 } else { 968 Handle p = java_lang_String::create_from_str(pp->filename(), THREAD); 969 return p(); 970 } 971} 972 973 974objArrayOop ClassLoader::get_system_packages(TRAPS) { 975 ResourceMark rm(THREAD); 976 int nof_entries; 977 const char** packages; 978 { 979 MutexLocker ml(PackageTable_lock, THREAD); 980 // Allocate resource char* array containing package names 981 nof_entries = _package_hash_table->number_of_entries(); 982 if ((packages = NEW_RESOURCE_ARRAY(const char*, nof_entries)) == NULL) { 983 return NULL; 984 } 985 _package_hash_table->copy_pkgnames(packages); 986 } 987 // Allocate objArray and fill with java.lang.String 988 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(), 989 nof_entries, CHECK_0); 990 objArrayHandle result(THREAD, r); 991 for (int i = 0; i < nof_entries; i++) { 992 Handle str = java_lang_String::create_from_str(packages[i], CHECK_0); 993 result->obj_at_put(i, str()); 994 } 995 996 return result(); 997} 998 999 1000instanceKlassHandle ClassLoader::load_classfile(Symbol* h_name, TRAPS) { 1001 ResourceMark rm(THREAD); 1002 const char* class_name = h_name->as_C_string(); 1003 EventMark m("loading class %s", class_name); 1004 ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion); 1005 1006 stringStream st; 1007 // st.print() uses too much stack space while handling a StackOverflowError 1008 // st.print("%s.class", h_name->as_utf8()); 1009 st.print_raw(h_name->as_utf8()); 1010 st.print_raw(".class"); 1011 const char* file_name = st.as_string(); 1012 ClassLoaderExt::Context context(class_name, file_name, THREAD); 1013 1014 // Lookup stream for parsing .class file 1015 ClassFileStream* stream = NULL; 1016 int classpath_index = 0; 1017 ClassPathEntry* e = NULL; 1018 instanceKlassHandle h; 1019 { 1020 PerfClassTraceTime vmtimer(perf_sys_class_lookup_time(), 1021 ((JavaThread*) THREAD)->get_thread_stat()->perf_timers_addr(), 1022 PerfClassTraceTime::CLASS_LOAD); 1023 e = _first_entry; 1024 while (e != NULL) { 1025 stream = e->open_stream(file_name, CHECK_NULL); 1026 if (!context.check(stream, classpath_index)) { 1027 return h; // NULL 1028 } 1029 if (stream != NULL) { 1030 break; 1031 } 1032 e = e->next(); 1033 ++classpath_index; 1034 } 1035 } 1036 1037 if (stream != NULL) { 1038 // class file found, parse it 1039 ClassFileParser parser(stream); 1040 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data(); 1041 Handle protection_domain; 1042 TempNewSymbol parsed_name = NULL; 1043 instanceKlassHandle result = parser.parseClassFile(h_name, 1044 loader_data, 1045 protection_domain, 1046 parsed_name, 1047 context.should_verify(classpath_index), 1048 THREAD); 1049 if (HAS_PENDING_EXCEPTION) { 1050 ResourceMark rm; 1051 if (DumpSharedSpaces) { 1052 tty->print_cr("Preload Error: Failed to load %s", class_name); 1053 } 1054 return h; 1055 } 1056 h = context.record_result(classpath_index, e, result, THREAD); 1057 } else { 1058 if (DumpSharedSpaces) { 1059 tty->print_cr("Preload Warning: Cannot find %s", class_name); 1060 } 1061 } 1062 1063 return h; 1064} 1065 1066 1067void ClassLoader::create_package_info_table(HashtableBucket<mtClass> *t, int length, 1068 int number_of_entries) { 1069 assert(_package_hash_table == NULL, "One package info table allowed."); 1070 assert(length == package_hash_table_size * sizeof(HashtableBucket<mtClass>), 1071 "bad shared package info size."); 1072 _package_hash_table = new PackageHashtable(package_hash_table_size, t, 1073 number_of_entries); 1074} 1075 1076 1077void ClassLoader::create_package_info_table() { 1078 assert(_package_hash_table == NULL, "shouldn't have one yet"); 1079 _package_hash_table = new PackageHashtable(package_hash_table_size); 1080} 1081 1082 1083// Initialize the class loader's access to methods in libzip. Parse and 1084// process the boot classpath into a list ClassPathEntry objects. Once 1085// this list has been created, it must not change order (see class PackageInfo) 1086// it can be appended to and is by jvmti and the kernel vm. 1087 1088void ClassLoader::initialize() { 1089 assert(_package_hash_table == NULL, "should have been initialized by now."); 1090 EXCEPTION_MARK; 1091 1092 if (UsePerfData) { 1093 // jvmstat performance counters 1094 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time"); 1095 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime"); 1096 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self"); 1097 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime"); 1098 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self"); 1099 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime"); 1100 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self"); 1101 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses"); 1102 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses"); 1103 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses"); 1104 1105 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime"); 1106 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self"); 1107 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime"); 1108 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime"); 1109 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime"); 1110 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime"); 1111 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self"); 1112 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount"); 1113 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses"); 1114 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime"); 1115 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self"); 1116 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes"); 1117 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes"); 1118 1119 1120 // The following performance counters are added for measuring the impact 1121 // of the bug fix of 6365597. They are mainly focused on finding out 1122 // the behavior of system & user-defined classloader lock, whether 1123 // ClassLoader.loadClass/findClass is being called synchronized or not. 1124 // Also two additional counters are created to see whether 'UnsyncloadClass' 1125 // flag is being set or not and how many times load_instance_class call 1126 // fails with linkageError etc. 1127 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS, 1128 "systemLoaderLockContentionRate"); 1129 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS, 1130 "nonSystemLoaderLockContentionRate"); 1131 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS, 1132 "jvmFindLoadedClassNoLockCalls"); 1133 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS, 1134 "jvmDefineClassNoLockCalls"); 1135 1136 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS, 1137 "jniDefineClassNoLockCalls"); 1138 1139 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, 1140 "unsafeDefineClassCalls"); 1141 1142 NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet"); 1143 NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS, 1144 "loadInstanceClassFailRate"); 1145 1146 // increment the isUnsyncloadClass counter if UnsyncloadClass is set. 1147 if (UnsyncloadClass) { 1148 _isUnsyncloadClass->inc(); 1149 } 1150 } 1151 1152 // lookup zip library entry points 1153 load_zip_library(); 1154 // lookup jimage library entry points 1155 load_jimage_library(); 1156#if INCLUDE_CDS 1157 // initialize search path 1158 if (DumpSharedSpaces) { 1159 _shared_paths_misc_info = SharedClassUtil::allocate_shared_paths_misc_info(); 1160 } 1161#endif 1162 setup_bootstrap_search_path(); 1163} 1164 1165#if INCLUDE_CDS 1166void ClassLoader::initialize_shared_path() { 1167 if (DumpSharedSpaces) { 1168 ClassLoaderExt::setup_search_paths(); 1169 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check() 1170 } 1171} 1172#endif 1173 1174jlong ClassLoader::classloader_time_ms() { 1175 return UsePerfData ? 1176 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1; 1177} 1178 1179jlong ClassLoader::class_init_count() { 1180 return UsePerfData ? _perf_classes_inited->get_value() : -1; 1181} 1182 1183jlong ClassLoader::class_init_time_ms() { 1184 return UsePerfData ? 1185 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1; 1186} 1187 1188jlong ClassLoader::class_verify_time_ms() { 1189 return UsePerfData ? 1190 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1; 1191} 1192 1193jlong ClassLoader::class_link_count() { 1194 return UsePerfData ? _perf_classes_linked->get_value() : -1; 1195} 1196 1197jlong ClassLoader::class_link_time_ms() { 1198 return UsePerfData ? 1199 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1; 1200} 1201 1202int ClassLoader::compute_Object_vtable() { 1203 // hardwired for JDK1.2 -- would need to duplicate class file parsing 1204 // code to determine actual value from file 1205 // Would be value '11' if finals were in vtable 1206 int JDK_1_2_Object_vtable_size = 5; 1207 return JDK_1_2_Object_vtable_size * vtableEntry::size(); 1208} 1209 1210 1211void classLoader_init() { 1212 ClassLoader::initialize(); 1213} 1214 1215 1216bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) { 1217 assert(orig != NULL && out != NULL && len > 0, "bad arguments"); 1218 if (CanonicalizeEntry != NULL) { 1219 JavaThread* THREAD = JavaThread::current(); 1220 JNIEnv* env = THREAD->jni_environment(); 1221 ResourceMark rm(THREAD); 1222 1223 // os::native_path writes into orig_copy 1224 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1); 1225 strcpy(orig_copy, orig); 1226 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) { 1227 return false; 1228 } 1229 } else { 1230 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing 1231 strncpy(out, orig, len); 1232 out[len - 1] = '\0'; 1233 } 1234 return true; 1235} 1236 1237#ifndef PRODUCT 1238 1239void ClassLoader::verify() { 1240 _package_hash_table->verify(); 1241} 1242 1243 1244// CompileTheWorld 1245// 1246// Iterates over all class path entries and forces compilation of all methods 1247// in all classes found. Currently, only zip/jar archives are searched. 1248// 1249// The classes are loaded by the Java level bootstrap class loader, and the 1250// initializer is called. If DelayCompilationDuringStartup is true (default), 1251// the interpreter will run the initialization code. Note that forcing 1252// initialization in this way could potentially lead to initialization order 1253// problems, in which case we could just force the initialization bit to be set. 1254 1255 1256// We need to iterate over the contents of a zip/jar file, so we replicate the 1257// jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile, 1258// since jzfile already has a void* definition. 1259// 1260// Note that this is only used in debug mode. 1261// 1262// HotSpot integration note: 1263// Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build 1264 1265 1266// JDK 1.3 version 1267typedef struct real_jzentry { /* Zip file entry */ 1268 char *name; /* entry name */ 1269 jint time; /* modification time */ 1270 jint size; /* size of uncompressed data */ 1271 jint csize; /* size of compressed data (zero if uncompressed) */ 1272 jint crc; /* crc of uncompressed data */ 1273 char *comment; /* optional zip file comment */ 1274 jbyte *extra; /* optional extra data */ 1275 jint pos; /* position of LOC header (if negative) or data */ 1276} real_jzentry; 1277 1278typedef struct real_jzfile { /* Zip file */ 1279 char *name; /* zip file name */ 1280 jint refs; /* number of active references */ 1281 jint fd; /* open file descriptor */ 1282 void *lock; /* read lock */ 1283 char *comment; /* zip file comment */ 1284 char *msg; /* zip error message */ 1285 void *entries; /* array of hash cells */ 1286 jint total; /* total number of entries */ 1287 unsigned short *table; /* Hash chain heads: indexes into entries */ 1288 jint tablelen; /* number of hash eads */ 1289 real_jzfile *next; /* next zip file in search list */ 1290 jzentry *cache; /* we cache the most recently freed jzentry */ 1291 /* Information on metadata names in META-INF directory */ 1292 char **metanames; /* array of meta names (may have null names) */ 1293 jint metacount; /* number of slots in metanames array */ 1294 /* If there are any per-entry comments, they are in the comments array */ 1295 char **comments; 1296} real_jzfile; 1297 1298void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) { 1299 // For now we only compile all methods in all classes in zip/jar files 1300 tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir); 1301 tty->cr(); 1302} 1303 1304bool ClassPathDirEntry::is_jrt() { 1305 return false; 1306} 1307 1308void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) { 1309 real_jzfile* zip = (real_jzfile*) _zip; 1310 tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name); 1311 tty->cr(); 1312 // Iterate over all entries in zip file 1313 for (int n = 0; ; n++) { 1314 real_jzentry * ze = (real_jzentry *)((*GetNextEntry)(_zip, n)); 1315 if (ze == NULL) break; 1316 ClassLoader::compile_the_world_in(ze->name, loader, CHECK); 1317 } 1318 if (HAS_PENDING_EXCEPTION) { 1319 if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1320 CLEAR_PENDING_EXCEPTION; 1321 tty->print_cr("\nCompileTheWorld : Ran out of memory\n"); 1322 tty->print_cr("Increase class metadata storage if a limit was set"); 1323 } else { 1324 tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n"); 1325 } 1326 } 1327} 1328 1329bool ClassPathZipEntry::is_jrt() { 1330 return false; 1331} 1332 1333void ClassLoader::compile_the_world() { 1334 EXCEPTION_MARK; 1335 HandleMark hm(THREAD); 1336 ResourceMark rm(THREAD); 1337 // Make sure we don't run with background compilation 1338 BackgroundCompilation = false; 1339 // Find bootstrap loader 1340 Handle system_class_loader (THREAD, SystemDictionary::java_system_loader()); 1341 // Iterate over all bootstrap class path entries 1342 ClassPathEntry* e = _first_entry; 1343 jlong start = os::javaTimeMillis(); 1344 while (e != NULL) { 1345 // We stop at bootmodules.jimage, unless it is the first bootstrap path entry 1346 if (e->is_jrt() && e != _first_entry) break; 1347 e->compile_the_world(system_class_loader, CATCH); 1348 e = e->next(); 1349 } 1350 jlong end = os::javaTimeMillis(); 1351 tty->print_cr("CompileTheWorld : Done (%d classes, %d methods, " JLONG_FORMAT " ms)", 1352 _compile_the_world_class_counter, _compile_the_world_method_counter, (end - start)); 1353 { 1354 // Print statistics as if before normal exit: 1355 extern void print_statistics(); 1356 print_statistics(); 1357 } 1358 vm_exit(0); 1359} 1360 1361int ClassLoader::_compile_the_world_class_counter = 0; 1362int ClassLoader::_compile_the_world_method_counter = 0; 1363static int _codecache_sweep_counter = 0; 1364 1365// Filter out all exceptions except OOMs 1366static void clear_pending_exception_if_not_oom(TRAPS) { 1367 if (HAS_PENDING_EXCEPTION && 1368 !PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) { 1369 CLEAR_PENDING_EXCEPTION; 1370 } 1371 // The CHECK at the caller will propagate the exception out 1372} 1373 1374/** 1375 * Returns if the given method should be compiled when doing compile-the-world. 1376 * 1377 * TODO: This should be a private method in a CompileTheWorld class. 1378 */ 1379static bool can_be_compiled(methodHandle m, int comp_level) { 1380 assert(CompileTheWorld, "must be"); 1381 1382 // It's not valid to compile a native wrapper for MethodHandle methods 1383 // that take a MemberName appendix since the bytecode signature is not 1384 // correct. 1385 vmIntrinsics::ID iid = m->intrinsic_id(); 1386 if (MethodHandles::is_signature_polymorphic(iid) && MethodHandles::has_member_arg(iid)) { 1387 return false; 1388 } 1389 1390 return CompilationPolicy::can_be_compiled(m, comp_level); 1391} 1392 1393void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) { 1394 if (string_ends_with(name, ".class")) { 1395 // We have a .class file 1396 int len = (int)strlen(name); 1397 char buffer[2048]; 1398 strncpy(buffer, name, len - 6); 1399 buffer[len-6] = 0; 1400 // If the file has a period after removing .class, it's not really a 1401 // valid class file. The class loader will check everything else. 1402 if (strchr(buffer, '.') == NULL) { 1403 _compile_the_world_class_counter++; 1404 if (_compile_the_world_class_counter > CompileTheWorldStopAt) return; 1405 1406 // Construct name without extension 1407 TempNewSymbol sym = SymbolTable::new_symbol(buffer, CHECK); 1408 // Use loader to load and initialize class 1409 Klass* ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD); 1410 instanceKlassHandle k (THREAD, ik); 1411 if (k.not_null() && !HAS_PENDING_EXCEPTION) { 1412 k->initialize(THREAD); 1413 } 1414 bool exception_occurred = HAS_PENDING_EXCEPTION; 1415 clear_pending_exception_if_not_oom(CHECK); 1416 if (CompileTheWorldPreloadClasses && k.not_null()) { 1417 ConstantPool::preload_and_initialize_all_classes(k->constants(), THREAD); 1418 if (HAS_PENDING_EXCEPTION) { 1419 // If something went wrong in preloading we just ignore it 1420 clear_pending_exception_if_not_oom(CHECK); 1421 tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_class_counter, buffer); 1422 } 1423 } 1424 1425 if (_compile_the_world_class_counter >= CompileTheWorldStartAt) { 1426 if (k.is_null() || exception_occurred) { 1427 // If something went wrong (e.g. ExceptionInInitializerError) we skip this class 1428 tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_class_counter, buffer); 1429 } else { 1430 tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_class_counter, buffer); 1431 // Preload all classes to get around uncommon traps 1432 // Iterate over all methods in class 1433 int comp_level = CompilationPolicy::policy()->initial_compile_level(); 1434 for (int n = 0; n < k->methods()->length(); n++) { 1435 methodHandle m (THREAD, k->methods()->at(n)); 1436 if (can_be_compiled(m, comp_level)) { 1437 if (++_codecache_sweep_counter == CompileTheWorldSafepointInterval) { 1438 // Give sweeper a chance to keep up with CTW 1439 VM_ForceSafepoint op; 1440 VMThread::execute(&op); 1441 _codecache_sweep_counter = 0; 1442 } 1443 // Force compilation 1444 CompileBroker::compile_method(m, InvocationEntryBci, comp_level, 1445 methodHandle(), 0, "CTW", THREAD); 1446 if (HAS_PENDING_EXCEPTION) { 1447 clear_pending_exception_if_not_oom(CHECK); 1448 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1449 } else { 1450 _compile_the_world_method_counter++; 1451 } 1452 if (TieredCompilation && TieredStopAtLevel >= CompLevel_full_optimization) { 1453 // Clobber the first compile and force second tier compilation 1454 nmethod* nm = m->code(); 1455 if (nm != NULL && !m->is_method_handle_intrinsic()) { 1456 // Throw out the code so that the code cache doesn't fill up 1457 nm->make_not_entrant(); 1458 m->clear_code(); 1459 } 1460 CompileBroker::compile_method(m, InvocationEntryBci, CompLevel_full_optimization, 1461 methodHandle(), 0, "CTW", THREAD); 1462 if (HAS_PENDING_EXCEPTION) { 1463 clear_pending_exception_if_not_oom(CHECK); 1464 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1465 } else { 1466 _compile_the_world_method_counter++; 1467 } 1468 } 1469 } else { 1470 tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_class_counter, m->name_and_sig_as_C_string()); 1471 } 1472 1473 nmethod* nm = m->code(); 1474 if (nm != NULL && !m->is_method_handle_intrinsic()) { 1475 // Throw out the code so that the code cache doesn't fill up 1476 nm->make_not_entrant(); 1477 m->clear_code(); 1478 } 1479 } 1480 } 1481 } 1482 } 1483 } 1484} 1485 1486#endif //PRODUCT 1487 1488// Please keep following two functions at end of this file. With them placed at top or in middle of the file, 1489// they could get inlined by agressive compiler, an unknown trick, see bug 6966589. 1490void PerfClassTraceTime::initialize() { 1491 if (!UsePerfData) return; 1492 1493 if (_eventp != NULL) { 1494 // increment the event counter 1495 _eventp->inc(); 1496 } 1497 1498 // stop the current active thread-local timer to measure inclusive time 1499 _prev_active_event = -1; 1500 for (int i=0; i < EVENT_TYPE_COUNT; i++) { 1501 if (_timers[i].is_active()) { 1502 assert(_prev_active_event == -1, "should have only one active timer"); 1503 _prev_active_event = i; 1504 _timers[i].stop(); 1505 } 1506 } 1507 1508 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) { 1509 // start the inclusive timer if not recursively called 1510 _t.start(); 1511 } 1512 1513 // start thread-local timer of the given event type 1514 if (!_timers[_event_type].is_active()) { 1515 _timers[_event_type].start(); 1516 } 1517} 1518 1519PerfClassTraceTime::~PerfClassTraceTime() { 1520 if (!UsePerfData) return; 1521 1522 // stop the thread-local timer as the event completes 1523 // and resume the thread-local timer of the event next on the stack 1524 _timers[_event_type].stop(); 1525 jlong selftime = _timers[_event_type].ticks(); 1526 1527 if (_prev_active_event >= 0) { 1528 _timers[_prev_active_event].start(); 1529 } 1530 1531 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return; 1532 1533 // increment the counters only on the leaf call 1534 _t.stop(); 1535 _timep->inc(_t.ticks()); 1536 if (_selftimep != NULL) { 1537 _selftimep->inc(selftime); 1538 } 1539 // add all class loading related event selftime to the accumulated time counter 1540 ClassLoader::perf_accumulated_time()->inc(selftime); 1541 1542 // reset the timer 1543 _timers[_event_type].reset(); 1544} 1545