1 /*
2 * Copyright (c) 1997, 2024, 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 "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/filemap.hpp"
29 #include "classfile/classFileStream.hpp"
30 #include "classfile/classLoader.inline.hpp"
31 #include "classfile/classLoaderData.inline.hpp"
32 #include "classfile/classLoaderExt.hpp"
33 #include "classfile/classLoadInfo.hpp"
34 #include "classfile/javaClasses.hpp"
35 #include "classfile/moduleEntry.hpp"
36 #include "classfile/modules.hpp"
37 #include "classfile/packageEntry.hpp"
38 #include "classfile/klassFactory.hpp"
39 #include "classfile/symbolTable.hpp"
40 #include "classfile/systemDictionary.hpp"
41 #include "classfile/systemDictionaryShared.hpp"
42 #include "classfile/vmClasses.hpp"
43 #include "classfile/vmSymbols.hpp"
44 #include "compiler/compileBroker.hpp"
45 #include "interpreter/bytecodeStream.hpp"
46 #include "interpreter/oopMapCache.hpp"
47 #include "jimage.hpp"
48 #include "jvm.h"
49 #include "logging/log.hpp"
50 #include "logging/logStream.hpp"
51 #include "logging/logTag.hpp"
52 #include "memory/allocation.inline.hpp"
53 #include "memory/oopFactory.hpp"
54 #include "memory/resourceArea.hpp"
55 #include "memory/universe.hpp"
56 #include "oops/instanceKlass.hpp"
57 #include "oops/instanceRefKlass.hpp"
58 #include "oops/klass.inline.hpp"
59 #include "oops/method.inline.hpp"
60 #include "oops/objArrayOop.inline.hpp"
61 #include "oops/oop.inline.hpp"
62 #include "oops/symbol.hpp"
63 #include "prims/jvm_misc.hpp"
64 #include "runtime/arguments.hpp"
65 #include "runtime/handles.inline.hpp"
66 #include "runtime/init.hpp"
67 #include "runtime/interfaceSupport.inline.hpp"
68 #include "runtime/java.hpp"
69 #include "runtime/javaCalls.hpp"
70 #include "runtime/os.hpp"
71 #include "runtime/perfData.inline.hpp"
72 #include "runtime/threadCritical.hpp"
73 #include "runtime/timer.hpp"
74 #include "runtime/vm_version.hpp"
75 #include "services/management.hpp"
76 #include "services/threadService.hpp"
77 #include "utilities/checkedCast.hpp"
78 #include "utilities/classpathStream.hpp"
79 #include "utilities/events.hpp"
80 #include "utilities/macros.hpp"
81 #include "utilities/utf8.hpp"
82
83 // Entry point in java.dll for path canonicalization
84
85 typedef int (*canonicalize_fn_t)(const char *orig, char *out, int len);
86
87 static canonicalize_fn_t CanonicalizeEntry = nullptr;
88
89 // Entry points for jimage.dll for loading jimage file entries
90
91 static JImageOpen_t JImageOpen = nullptr;
92 static JImageClose_t JImageClose = nullptr;
93 static JImageFindResource_t JImageFindResource = nullptr;
94 static JImageGetResource_t JImageGetResource = nullptr;
95
96 // JimageFile pointer, or null if exploded JDK build.
97 static JImageFile* JImage_file = nullptr;
98
99 // Globals
100
101 PerfCounter* ClassLoader::_perf_accumulated_time = nullptr;
102 PerfCounter* ClassLoader::_perf_classes_inited = nullptr;
103 PerfCounter* ClassLoader::_perf_class_init_time = nullptr;
104 PerfCounter* ClassLoader::_perf_class_init_selftime = nullptr;
105 PerfCounter* ClassLoader::_perf_class_init_bytecodes_count = nullptr;
106 PerfCounter* ClassLoader::_perf_classes_verified = nullptr;
107 PerfCounter* ClassLoader::_perf_class_verify_time = nullptr;
108 PerfCounter* ClassLoader::_perf_class_verify_selftime = nullptr;
109 PerfCounter* ClassLoader::_perf_classes_linked = nullptr;
110 PerfCounter* ClassLoader::_perf_class_link_time = nullptr;
111 PerfCounter* ClassLoader::_perf_class_link_selftime = nullptr;
112 PerfCounter* ClassLoader::_perf_shared_classload_time = nullptr;
113 PerfCounter* ClassLoader::_perf_sys_classload_time = nullptr;
114 PerfCounter* ClassLoader::_perf_app_classload_time = nullptr;
115 PerfCounter* ClassLoader::_perf_app_classload_selftime = nullptr;
116 PerfCounter* ClassLoader::_perf_app_classload_count = nullptr;
117 PerfCounter* ClassLoader::_perf_define_appclasses = nullptr;
118 PerfCounter* ClassLoader::_perf_define_appclass_time = nullptr;
119 PerfCounter* ClassLoader::_perf_define_appclass_selftime = nullptr;
120 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = nullptr;
121 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = nullptr;
122 PerfCounter* ClassLoader::_perf_preload_total_time = nullptr;
123 PerfCounter* ClassLoader::_perf_preload_time = nullptr;
124 PerfCounter* ClassLoader::_perf_prelink_time = nullptr;
125 PerfCounter* ClassLoader::_perf_preinit_time = nullptr;
126 PerfCounter* ClassLoader::_perf_preresolve_time = nullptr;
127 PerfCounter* ClassLoader::_perf_ik_link_methods_time = nullptr;
128 PerfCounter* ClassLoader::_perf_method_adapters_time = nullptr;
129 PerfCounter* ClassLoader::_perf_ik_link_methods_count = nullptr;
130 PerfCounter* ClassLoader::_perf_method_adapters_count = nullptr;
131 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = nullptr;
132 PerfCounter* ClassLoader::_perf_secondary_hash_time = nullptr;
133
134 PerfTickCounters* ClassLoader::_perf_resolve_indy_time = nullptr;
135 PerfTickCounters* ClassLoader::_perf_resolve_invokehandle_time = nullptr;
136 PerfTickCounters* ClassLoader::_perf_resolve_mh_time = nullptr;
137 PerfTickCounters* ClassLoader::_perf_resolve_mt_time = nullptr;
138
139 PerfCounter* ClassLoader::_perf_resolve_indy_count = nullptr;
140 PerfCounter* ClassLoader::_perf_resolve_invokehandle_count = nullptr;
141 PerfCounter* ClassLoader::_perf_resolve_mh_count = nullptr;
142 PerfCounter* ClassLoader::_perf_resolve_mt_count = nullptr;
143
144 void ClassLoader::print_counters() {
145 if (UsePerfData) {
146 LogStreamHandle(Info, init) log;
147 if (log.is_enabled()) {
148 log.print_cr("ClassLoader:");
149 log.print( " clinit: %ldms / %ld events",
150 ClassLoader::class_init_time_ms(), ClassLoader::class_init_count());
151 if (CountBytecodes || CountBytecodesPerThread) {
152 log.print("; executed %ld bytecodes", ClassLoader::class_init_bytecodes_count());
153 }
154 log.cr();
155 log.print_cr(" resolve...");
156 log.print_cr(" invokedynamic: %ldms (elapsed) %ldms (thread) / %ld events",
157 _perf_resolve_indy_time->elapsed_counter_value_ms(),
158 _perf_resolve_indy_time->thread_counter_value_ms(),
159 _perf_resolve_indy_count->get_value());
160 log.print_cr(" invokehandle: %ldms (elapsed) %ldms (thread) / %ld events",
161 _perf_resolve_invokehandle_time->elapsed_counter_value_ms(),
162 _perf_resolve_invokehandle_time->thread_counter_value_ms(),
163 _perf_resolve_invokehandle_count->get_value());
164 log.print_cr(" CP_MethodHandle: %ldms (elapsed) %ldms (thread) / %ld events",
165 _perf_resolve_mh_time->elapsed_counter_value_ms(),
166 _perf_resolve_mh_time->thread_counter_value_ms(),
167 _perf_resolve_mh_count->get_value());
168 log.print_cr(" CP_MethodType: %ldms (elapsed) %ldms (thread) / %ld events",
169 _perf_resolve_mt_time->elapsed_counter_value_ms(),
170 _perf_resolve_mt_time->thread_counter_value_ms(),
171 _perf_resolve_mt_count->get_value());
172 }
173 }
174 }
175
176 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = nullptr;
177 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = nullptr;
178 ClassPathEntry* ClassLoader::_jrt_entry = nullptr;
179
180 ClassPathEntry* volatile ClassLoader::_first_append_entry_list = nullptr;
181 ClassPathEntry* volatile ClassLoader::_last_append_entry = nullptr;
182 #if INCLUDE_CDS
183 ClassPathEntry* ClassLoader::_app_classpath_entries = nullptr;
184 ClassPathEntry* ClassLoader::_last_app_classpath_entry = nullptr;
185 ClassPathEntry* ClassLoader::_module_path_entries = nullptr;
186 ClassPathEntry* ClassLoader::_last_module_path_entry = nullptr;
187 #endif
188
189 // helper routines
190 #if INCLUDE_CDS
191 static bool string_starts_with(const char* str, const char* str_to_find) {
192 size_t str_len = strlen(str);
193 size_t str_to_find_len = strlen(str_to_find);
194 if (str_to_find_len > str_len) {
195 return false;
196 }
197 return (strncmp(str, str_to_find, str_to_find_len) == 0);
198 }
199 #endif
200
201 static const char* get_jimage_version_string() {
202 static char version_string[10] = "";
203 if (version_string[0] == '\0') {
204 jio_snprintf(version_string, sizeof(version_string), "%d.%d",
205 VM_Version::vm_major_version(), VM_Version::vm_minor_version());
206 }
207 return (const char*)version_string;
208 }
209
210 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
211 size_t str_len = strlen(str);
212 size_t str_to_find_len = strlen(str_to_find);
213 if (str_to_find_len > str_len) {
214 return false;
215 }
216 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
217 }
218
219 // Used to obtain the package name from a fully qualified class name.
220 Symbol* ClassLoader::package_from_class_name(const Symbol* name, bool* bad_class_name) {
221 if (name == nullptr) {
222 if (bad_class_name != nullptr) {
223 *bad_class_name = true;
224 }
225 return nullptr;
226 }
227
228 int utf_len = name->utf8_length();
229 const jbyte* base = (const jbyte*)name->base();
230 const jbyte* start = base;
231 const jbyte* end = UTF8::strrchr(start, utf_len, JVM_SIGNATURE_SLASH);
232 if (end == nullptr) {
233 return nullptr;
234 }
235 // Skip over '['s
236 if (*start == JVM_SIGNATURE_ARRAY) {
237 do {
238 start++;
239 } while (start < end && *start == JVM_SIGNATURE_ARRAY);
240
241 // Fully qualified class names should not contain a 'L'.
242 // Set bad_class_name to true to indicate that the package name
243 // could not be obtained due to an error condition.
244 // In this situation, is_same_class_package returns false.
245 if (*start == JVM_SIGNATURE_CLASS) {
246 if (bad_class_name != nullptr) {
247 *bad_class_name = true;
248 }
249 return nullptr;
250 }
251 }
252 // A class name could have just the slash character in the name,
253 // in which case start > end
254 if (start >= end) {
255 // No package name
256 if (bad_class_name != nullptr) {
257 *bad_class_name = true;
258 }
259 return nullptr;
260 }
261 return SymbolTable::new_symbol(name, pointer_delta_as_int(start, base), pointer_delta_as_int(end, base));
262 }
263
264 // Given a fully qualified package name, find its defining package in the class loader's
265 // package entry table.
266 PackageEntry* ClassLoader::get_package_entry(Symbol* pkg_name, ClassLoaderData* loader_data) {
267 if (pkg_name == nullptr) {
268 return nullptr;
269 }
270 PackageEntryTable* pkgEntryTable = loader_data->packages();
271 return pkgEntryTable->lookup_only(pkg_name);
272 }
273
274 const char* ClassPathEntry::copy_path(const char* path) {
275 char* copy = NEW_C_HEAP_ARRAY(char, strlen(path)+1, mtClass);
276 strcpy(copy, path);
277 return copy;
278 }
279
280 ClassPathDirEntry::~ClassPathDirEntry() {
281 FREE_C_HEAP_ARRAY(char, _dir);
282 }
283
284 ClassFileStream* ClassPathDirEntry::open_stream(JavaThread* current, const char* name) {
285 // construct full path name
286 assert((_dir != nullptr) && (name != nullptr), "sanity");
287 size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1;
288 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(current, char, path_len);
289 int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name);
290 assert(len == (int)(path_len - 1), "sanity");
291 // check if file exists
292 struct stat st;
293 if (os::stat(path, &st) == 0) {
294 // found file, open it
295 int file_handle = os::open(path, 0, 0);
296 if (file_handle != -1) {
297 // read contents into resource array
298 u1* buffer = NEW_RESOURCE_ARRAY_IN_THREAD(current, u1, st.st_size);
299 size_t num_read = ::read(file_handle, (char*) buffer, st.st_size);
300 // close file
301 ::close(file_handle);
302 // construct ClassFileStream
303 if (num_read == (size_t)st.st_size) {
304 if (UsePerfData) {
305 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
306 }
307 #ifdef ASSERT
308 // Freeing path is a no-op here as buffer prevents it from being reclaimed. But we keep it for
309 // debug builds so that we guard against use-after-free bugs.
310 FREE_RESOURCE_ARRAY_IN_THREAD(current, char, path, path_len);
311 #endif
312 // We don't verify the length of the classfile stream fits in an int, but this is the
313 // bootloader so we have control of this.
314 // Resource allocated
315 return new ClassFileStream(buffer,
316 checked_cast<int>(st.st_size),
317 _dir,
318 ClassFileStream::verify);
319 }
320 }
321 }
322 FREE_RESOURCE_ARRAY_IN_THREAD(current, char, path, path_len);
323 return nullptr;
324 }
325
326 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name,
327 bool from_class_path_attr) : ClassPathEntry() {
328 _zip = zip;
329 _zip_name = copy_path(zip_name);
330 _from_class_path_attr = from_class_path_attr;
331 }
332
333 ClassPathZipEntry::~ClassPathZipEntry() {
334 ZipLibrary::close(_zip);
335 FREE_C_HEAP_ARRAY(char, _zip_name);
336 }
337
338 bool ClassPathZipEntry::has_entry(JavaThread* current, const char* name) {
339 ThreadToNativeFromVM ttn(current);
340 // check whether zip archive contains name
341 jint name_len;
342 jint filesize;
343 jzentry* entry = ZipLibrary::find_entry(_zip, name, &filesize, &name_len);
344 if (entry == nullptr) {
345 return false;
346 } else {
347 ZipLibrary::free_entry(_zip, entry);
348 return true;
349 }
350 }
351
352 u1* ClassPathZipEntry::open_entry(JavaThread* current, const char* name, jint* filesize, bool nul_terminate) {
353 // enable call to C land
354 ThreadToNativeFromVM ttn(current);
355 // check whether zip archive contains name
356 jint name_len;
357 jzentry* entry = ZipLibrary::find_entry(_zip, name, filesize, &name_len);
358 if (entry == nullptr) return nullptr;
359 u1* buffer;
360 char name_buf[128];
361 char* filename;
362 if (name_len < 128) {
363 filename = name_buf;
364 } else {
365 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
366 }
367
368 // read contents into resource array
369 size_t size = (uint32_t)(*filesize);
370 if (nul_terminate) {
371 if (sizeof(size) == sizeof(uint32_t) && size == UINT_MAX) {
372 return nullptr; // 32-bit integer overflow will occur.
373 }
374 size++;
375 }
376
377 // ZIP_ReadEntry also frees zentry
378 buffer = NEW_RESOURCE_ARRAY(u1, size);
379 if (!ZipLibrary::read_entry(_zip, entry, buffer, filename)) {
380 return nullptr;
381 }
382
383 // return result
384 if (nul_terminate) {
385 buffer[size - 1] = 0;
386 }
387 return buffer;
388 }
389
390 ClassFileStream* ClassPathZipEntry::open_stream(JavaThread* current, const char* name) {
391 jint filesize;
392 u1* buffer = open_entry(current, name, &filesize, false);
393 if (buffer == nullptr) {
394 return nullptr;
395 }
396 if (UsePerfData) {
397 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
398 }
399 // Resource allocated
400 return new ClassFileStream(buffer,
401 filesize,
402 _zip_name,
403 ClassFileStream::verify);
404 }
405
406 DEBUG_ONLY(ClassPathImageEntry* ClassPathImageEntry::_singleton = nullptr;)
407
408 JImageFile* ClassPathImageEntry::jimage() const {
409 return JImage_file;
410 }
411
412 JImageFile* ClassPathImageEntry::jimage_non_null() const {
413 assert(ClassLoader::has_jrt_entry(), "must be");
414 assert(jimage() != nullptr, "should have been opened by ClassLoader::lookup_vm_options "
415 "and remained throughout normal JVM lifetime");
416 return jimage();
417 }
418
419 void ClassPathImageEntry::close_jimage() {
420 if (jimage() != nullptr) {
421 (*JImageClose)(jimage());
422 JImage_file = nullptr;
423 }
424 }
425
426 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
427 ClassPathEntry() {
428 guarantee(jimage != nullptr, "jimage file is null");
429 guarantee(name != nullptr, "jimage file name is null");
430 assert(_singleton == nullptr, "VM supports only one jimage");
431 DEBUG_ONLY(_singleton = this);
432 size_t len = strlen(name) + 1;
433 _name = copy_path(name);
434 }
435
436 ClassFileStream* ClassPathImageEntry::open_stream(JavaThread* current, const char* name) {
437 return open_stream_for_loader(current, name, ClassLoaderData::the_null_class_loader_data());
438 }
439
440 // For a class in a named module, look it up in the jimage file using this syntax:
441 // /<module-name>/<package-name>/<base-class>
442 //
443 // Assumptions:
444 // 1. There are no unnamed modules in the jimage file.
445 // 2. A package is in at most one module in the jimage file.
446 //
447 ClassFileStream* ClassPathImageEntry::open_stream_for_loader(JavaThread* current, const char* name, ClassLoaderData* loader_data) {
448 jlong size;
449 JImageLocationRef location = (*JImageFindResource)(jimage_non_null(), "", get_jimage_version_string(), name, &size);
450
451 if (location == 0) {
452 TempNewSymbol class_name = SymbolTable::new_symbol(name);
453 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name);
454
455 if (pkg_name != nullptr) {
456 if (!Universe::is_module_initialized()) {
457 location = (*JImageFindResource)(jimage_non_null(), JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
458 } else {
459 PackageEntry* package_entry = ClassLoader::get_package_entry(pkg_name, loader_data);
460 if (package_entry != nullptr) {
461 ResourceMark rm(current);
462 // Get the module name
463 ModuleEntry* module = package_entry->module();
464 assert(module != nullptr, "Boot classLoader package missing module");
465 assert(module->is_named(), "Boot classLoader package is in unnamed module");
466 const char* module_name = module->name()->as_C_string();
467 if (module_name != nullptr) {
468 location = (*JImageFindResource)(jimage_non_null(), module_name, get_jimage_version_string(), name, &size);
469 }
470 }
471 }
472 }
473 }
474 if (location != 0) {
475 if (UsePerfData) {
476 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
477 }
478 char* data = NEW_RESOURCE_ARRAY(char, size);
479 (*JImageGetResource)(jimage_non_null(), location, data, size);
480 // Resource allocated
481 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be");
482 return new ClassFileStream((u1*)data,
483 checked_cast<int>(size),
484 _name,
485 ClassFileStream::verify,
486 true); // from_boot_loader_modules_image
487 }
488
489 return nullptr;
490 }
491
492 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
493 const char* module_name,
494 const char* file_name,
495 jlong &size) {
496 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
497 }
498
499 bool ClassPathImageEntry::is_modules_image() const {
500 assert(this == _singleton, "VM supports a single jimage");
501 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be used for jrt entry");
502 return true;
503 }
504
505 #if INCLUDE_CDS
506 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
507 assert(CDSConfig::is_dumping_archive(), "sanity");
508 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
509 vm_exit_during_initialization(error, message);
510 }
511 #endif
512
513 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
514 _module_name = module_name;
515 _module_first_entry = nullptr;
516 _module_last_entry = nullptr;
517 }
518
519 ModuleClassPathList::~ModuleClassPathList() {
520 // Clean out each ClassPathEntry on list
521 ClassPathEntry* e = _module_first_entry;
522 while (e != nullptr) {
523 ClassPathEntry* next_entry = e->next();
524 delete e;
525 e = next_entry;
526 }
527 }
528
529 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
530 if (new_entry != nullptr) {
531 if (_module_last_entry == nullptr) {
532 _module_first_entry = _module_last_entry = new_entry;
533 } else {
534 _module_last_entry->set_next(new_entry);
535 _module_last_entry = new_entry;
536 }
537 }
538 }
539
540 void ClassLoader::trace_class_path(const char* msg, const char* name) {
541 LogTarget(Info, class, path) lt;
542 if (lt.is_enabled()) {
543 LogStream ls(lt);
544 if (msg) {
545 ls.print("%s", msg);
546 }
547 if (name) {
548 if (strlen(name) < 256) {
549 ls.print("%s", name);
550 } else {
551 // For very long paths, we need to print each character separately,
552 // as print_cr() has a length limit
553 while (name[0] != '\0') {
554 ls.print("%c", name[0]);
555 name++;
556 }
557 }
558 }
559 ls.cr();
560 }
561 }
562
563 void ClassLoader::setup_bootstrap_search_path(JavaThread* current) {
564 const char* bootcp = Arguments::get_boot_class_path();
565 assert(bootcp != nullptr, "Boot class path must not be nullptr");
566 if (PrintSharedArchiveAndExit) {
567 // Don't print bootcp - this is the bootcp of this current VM process, not necessarily
568 // the same as the boot classpath of the shared archive.
569 } else {
570 trace_class_path("bootstrap loader class path=", bootcp);
571 }
572 setup_bootstrap_search_path_impl(current, bootcp);
573 }
574
575 #if INCLUDE_CDS
576 void ClassLoader::setup_app_search_path(JavaThread* current, const char *class_path) {
577 assert(CDSConfig::is_dumping_archive(), "sanity");
578
579 ResourceMark rm(current);
580 ClasspathStream cp_stream(class_path);
581
582 while (cp_stream.has_next()) {
583 const char* path = cp_stream.get_next();
584 update_class_path_entry_list(current, path, /* check_for_duplicates */ true,
585 /* is_boot_append */ false, /* from_class_path_attr */ false);
586 }
587 }
588
589 void ClassLoader::add_to_module_path_entries(const char* path,
590 ClassPathEntry* entry) {
591 assert(entry != nullptr, "ClassPathEntry should not be nullptr");
592 assert(CDSConfig::is_dumping_archive(), "sanity");
593
594 // The entry does not exist, add to the list
595 if (_module_path_entries == nullptr) {
596 assert(_last_module_path_entry == nullptr, "Sanity");
597 _module_path_entries = _last_module_path_entry = entry;
598 } else {
599 _last_module_path_entry->set_next(entry);
600 _last_module_path_entry = entry;
601 }
602 }
603
604 // Add a module path to the _module_path_entries list.
605 void ClassLoader::setup_module_search_path(JavaThread* current, const char* path) {
606 assert(CDSConfig::is_dumping_archive(), "sanity");
607 struct stat st;
608 if (os::stat(path, &st) != 0) {
609 tty->print_cr("os::stat error %d (%s). CDS dump aborted (path was \"%s\").",
610 errno, os::errno_name(errno), path);
611 vm_exit_during_initialization();
612 }
613 // File or directory found
614 ClassPathEntry* new_entry = nullptr;
615 new_entry = create_class_path_entry(current, path, &st,
616 false /*is_boot_append */, false /* from_class_path_attr */);
617 if (new_entry != nullptr) {
618 add_to_module_path_entries(path, new_entry);
619 }
620 }
621
622 #endif // INCLUDE_CDS
623
624 void ClassLoader::close_jrt_image() {
625 // Not applicable for exploded builds
626 if (!ClassLoader::has_jrt_entry()) return;
627 _jrt_entry->close_jimage();
628 }
629
630 // Construct the array of module/path pairs as specified to --patch-module
631 // for the boot loader to search ahead of the jimage, if the class being
632 // loaded is defined to a module that has been specified to --patch-module.
633 void ClassLoader::setup_patch_mod_entries() {
634 JavaThread* current = JavaThread::current();
635 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
636 int num_of_entries = patch_mod_args->length();
637
638 // Set up the boot loader's _patch_mod_entries list
639 _patch_mod_entries = new (mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, mtModule);
640
641 for (int i = 0; i < num_of_entries; i++) {
642 const char* module_name = (patch_mod_args->at(i))->module_name();
643 Symbol* const module_sym = SymbolTable::new_symbol(module_name);
644 assert(module_sym != nullptr, "Failed to obtain Symbol for module name");
645 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
646
647 char* class_path = (patch_mod_args->at(i))->path_string();
648 ResourceMark rm(current);
649 ClasspathStream cp_stream(class_path);
650
651 while (cp_stream.has_next()) {
652 const char* path = cp_stream.get_next();
653 struct stat st;
654 if (os::stat(path, &st) == 0) {
655 // File or directory found
656 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st, false, false);
657 // If the path specification is valid, enter it into this module's list
658 if (new_entry != nullptr) {
659 module_cpl->add_to_list(new_entry);
660 }
661 }
662 }
663
664 // Record the module into the list of --patch-module entries only if
665 // valid ClassPathEntrys have been created
666 if (module_cpl->module_first_entry() != nullptr) {
667 _patch_mod_entries->push(module_cpl);
668 }
669 }
670 }
671
672 // Determine whether the module has been patched via the command-line
673 // option --patch-module
674 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
675 if (_patch_mod_entries != nullptr && _patch_mod_entries->is_nonempty()) {
676 int table_len = _patch_mod_entries->length();
677 for (int i = 0; i < table_len; i++) {
678 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
679 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
680 return true;
681 }
682 }
683 }
684 return false;
685 }
686
687 // Set up the _jrt_entry if present and boot append path
688 void ClassLoader::setup_bootstrap_search_path_impl(JavaThread* current, const char *class_path) {
689 ResourceMark rm(current);
690 ClasspathStream cp_stream(class_path);
691 bool set_base_piece = true;
692
693 #if INCLUDE_CDS
694 if (CDSConfig::is_dumping_archive()) {
695 if (!Arguments::has_jimage()) {
696 vm_exit_during_initialization("CDS is not supported in exploded JDK build", nullptr);
697 }
698 }
699 #endif
700
701 while (cp_stream.has_next()) {
702 const char* path = cp_stream.get_next();
703
704 if (set_base_piece) {
705 // The first time through the bootstrap_search setup, it must be determined
706 // what the base or core piece of the boot loader search is. Either a java runtime
707 // image is present or this is an exploded module build situation.
708 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
709 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
710 struct stat st;
711 if (os::stat(path, &st) == 0) {
712 // Directory found
713 if (JImage_file != nullptr) {
714 assert(Arguments::has_jimage(), "sanity check");
715 const char* canonical_path = get_canonical_path(path, current);
716 assert(canonical_path != nullptr, "canonical_path issue");
717
718 _jrt_entry = new ClassPathImageEntry(JImage_file, canonical_path);
719 assert(_jrt_entry != nullptr && _jrt_entry->is_modules_image(), "No java runtime image present");
720 assert(_jrt_entry->jimage() != nullptr, "No java runtime image");
721 } // else it's an exploded build.
722 } else {
723 // If path does not exist, exit
724 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
725 }
726 set_base_piece = false;
727 } else {
728 // Every entry on the boot class path after the initial base piece,
729 // which is set by os::set_boot_path(), is considered an appended entry.
730 update_class_path_entry_list(current, path, /* check_for_duplicates */ false,
731 /* is_boot_append */ true, /* from_class_path_attr */ false);
732 }
733 }
734 }
735
736 // Gets the exploded path for the named module. The memory for the path
737 // is allocated on the C heap if `c_heap` is true otherwise in the resource area.
738 static const char* get_exploded_module_path(const char* module_name, bool c_heap) {
739 const char *home = Arguments::get_java_home();
740 const char file_sep = os::file_separator()[0];
741 // 10 represents the length of "modules" + 2 file separators + \0
742 size_t len = strlen(home) + strlen(module_name) + 10;
743 char *path = c_heap ? NEW_C_HEAP_ARRAY(char, len, mtModule) : NEW_RESOURCE_ARRAY(char, len);
744 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
745 return path;
746 }
747
748 // During an exploded modules build, each module defined to the boot loader
749 // will be added to the ClassLoader::_exploded_entries array.
750 void ClassLoader::add_to_exploded_build_list(JavaThread* current, Symbol* module_sym) {
751 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
752 assert(_exploded_entries != nullptr, "_exploded_entries was not initialized");
753
754 // Find the module's symbol
755 ResourceMark rm(current);
756 const char *module_name = module_sym->as_C_string();
757 const char *path = get_exploded_module_path(module_name, false);
758
759 struct stat st;
760 if (os::stat(path, &st) == 0) {
761 // Directory found
762 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st, false, false);
763
764 // If the path specification is valid, enter it into this module's list.
765 // There is no need to check for duplicate modules in the exploded entry list,
766 // since no two modules with the same name can be defined to the boot loader.
767 // This is checked at module definition time in Modules::define_module.
768 if (new_entry != nullptr) {
769 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
770 module_cpl->add_to_list(new_entry);
771 {
772 MutexLocker ml(current, Module_lock);
773 _exploded_entries->push(module_cpl);
774 }
775 log_info(class, load)("path: %s", path);
776 }
777 }
778 }
779
780 jzfile* ClassLoader::open_zip_file(const char* canonical_path, char** error_msg, JavaThread* thread) {
781 // enable call to C land
782 ThreadToNativeFromVM ttn(thread);
783 HandleMark hm(thread);
784 return ZipLibrary::open(canonical_path, error_msg);
785 }
786
787 ClassPathEntry* ClassLoader::create_class_path_entry(JavaThread* current,
788 const char *path, const struct stat* st,
789 bool is_boot_append,
790 bool from_class_path_attr) {
791 ClassPathEntry* new_entry = nullptr;
792 if ((st->st_mode & S_IFMT) == S_IFREG) {
793 ResourceMark rm(current);
794 // Regular file, should be a zip file
795 // Canonicalized filename
796 const char* canonical_path = get_canonical_path(path, current);
797 if (canonical_path == nullptr) {
798 return nullptr;
799 }
800 char* error_msg = nullptr;
801 jzfile* zip = open_zip_file(canonical_path, &error_msg, current);
802 if (zip != nullptr && error_msg == nullptr) {
803 new_entry = new ClassPathZipEntry(zip, path, from_class_path_attr);
804 } else {
805 #if INCLUDE_CDS
806 ClassLoaderExt::set_has_non_jar_in_classpath();
807 #endif
808 return nullptr;
809 }
810 log_info(class, path)("opened: %s", path);
811 log_info(class, load)("opened: %s", path);
812 } else {
813 // Directory
814 new_entry = new ClassPathDirEntry(path);
815 log_info(class, load)("path: %s", path);
816 }
817 return new_entry;
818 }
819
820
821 // Create a class path zip entry for a given path (return null if not found
822 // or zip/JAR file cannot be opened)
823 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
824 // check for a regular file
825 struct stat st;
826 if (os::stat(path, &st) == 0) {
827 if ((st.st_mode & S_IFMT) == S_IFREG) {
828 JavaThread* thread = JavaThread::current();
829 ResourceMark rm(thread);
830 const char* canonical_path = get_canonical_path(path, thread);
831 if (canonical_path != nullptr) {
832 char* error_msg = nullptr;
833 jzfile* zip = open_zip_file(canonical_path, &error_msg, thread);
834 if (zip != nullptr && error_msg == nullptr) {
835 // create using canonical path
836 return new ClassPathZipEntry(zip, canonical_path, false);
837 }
838 }
839 }
840 }
841 return nullptr;
842 }
843
844 // The boot append entries are added with a lock, and read lock free.
845 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
846 if (new_entry != nullptr) {
847 MutexLocker ml(Bootclasspath_lock, Mutex::_no_safepoint_check_flag);
848 if (_last_append_entry == nullptr) {
849 _last_append_entry = new_entry;
850 assert(first_append_entry() == nullptr, "boot loader's append class path entry list not empty");
851 Atomic::release_store(&_first_append_entry_list, new_entry);
852 } else {
853 _last_append_entry->set_next(new_entry);
854 _last_append_entry = new_entry;
855 }
856 }
857 }
858
859 // Record the path entries specified in -cp during dump time. The recorded
860 // information will be used at runtime for loading the archived app classes.
861 //
862 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for
863 // loading app classes. Instead, the app class are loaded by the
864 // jdk/internal/loader/ClassLoaders$AppClassLoader instance.
865 bool ClassLoader::add_to_app_classpath_entries(JavaThread* current,
866 ClassPathEntry* entry,
867 bool check_for_duplicates) {
868 #if INCLUDE_CDS
869 assert(entry != nullptr, "ClassPathEntry should not be nullptr");
870 ClassPathEntry* e = _app_classpath_entries;
871 if (check_for_duplicates) {
872 while (e != nullptr) {
873 if (strcmp(e->name(), entry->name()) == 0) {
874 // entry already exists
875 return false;
876 }
877 e = e->next();
878 }
879 }
880
881 // The entry does not exist, add to the list
882 if (_app_classpath_entries == nullptr) {
883 assert(_last_app_classpath_entry == nullptr, "Sanity");
884 _app_classpath_entries = _last_app_classpath_entry = entry;
885 } else {
886 _last_app_classpath_entry->set_next(entry);
887 _last_app_classpath_entry = entry;
888 }
889
890 if (entry->is_jar_file()) {
891 ClassLoaderExt::process_jar_manifest(current, entry);
892 }
893 #endif
894 return true;
895 }
896
897 // Returns true IFF the file/dir exists and the entry was successfully created.
898 bool ClassLoader::update_class_path_entry_list(JavaThread* current,
899 const char *path,
900 bool check_for_duplicates,
901 bool is_boot_append,
902 bool from_class_path_attr) {
903 struct stat st;
904 if (os::stat(path, &st) == 0) {
905 // File or directory found
906 ClassPathEntry* new_entry = nullptr;
907 new_entry = create_class_path_entry(current, path, &st, is_boot_append, from_class_path_attr);
908 if (new_entry == nullptr) {
909 return false;
910 }
911
912 // Do not reorder the bootclasspath which would break get_system_package().
913 // Add new entry to linked list
914 if (is_boot_append) {
915 add_to_boot_append_entries(new_entry);
916 } else {
917 if (!add_to_app_classpath_entries(current, new_entry, check_for_duplicates)) {
918 // new_entry is not saved, free it now
919 delete new_entry;
920 }
921 }
922 return true;
923 } else {
924 return false;
925 }
926 }
927
928 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
929 ResourceMark rm;
930 int num_of_entries = module_list->length();
931 for (int i = 0; i < num_of_entries; i++) {
932 ClassPathEntry* e;
933 ModuleClassPathList* mpl = module_list->at(i);
934 tty->print("%s=", mpl->module_name()->as_C_string());
935 e = mpl->module_first_entry();
936 while (e != nullptr) {
937 tty->print("%s", e->name());
938 e = e->next();
939 if (e != nullptr) {
940 tty->print("%s", os::path_separator());
941 }
942 }
943 tty->print(" ;");
944 }
945 }
946
947 void ClassLoader::print_bootclasspath() {
948 ClassPathEntry* e;
949 tty->print("[bootclasspath= ");
950
951 // Print --patch-module module/path specifications first
952 if (_patch_mod_entries != nullptr) {
953 print_module_entry_table(_patch_mod_entries);
954 }
955
956 // [jimage | exploded modules build]
957 if (has_jrt_entry()) {
958 // Print the location of the java runtime image
959 tty->print("%s ;", _jrt_entry->name());
960 } else {
961 // Print exploded module build path specifications
962 if (_exploded_entries != nullptr) {
963 print_module_entry_table(_exploded_entries);
964 }
965 }
966
967 // appended entries
968 e = first_append_entry();
969 while (e != nullptr) {
970 tty->print("%s ;", e->name());
971 e = e->next();
972 }
973 tty->print_cr("]");
974 }
975
976 void* ClassLoader::dll_lookup(void* lib, const char* name, const char* path) {
977 void* func = os::dll_lookup(lib, name);
978 if (func == nullptr) {
979 char msg[256] = "";
980 jio_snprintf(msg, sizeof(msg), "Could not resolve \"%s\"", name);
981 vm_exit_during_initialization(msg, path);
982 }
983 return func;
984 }
985
986 void ClassLoader::load_java_library() {
987 assert(CanonicalizeEntry == nullptr, "should not load java library twice");
988 void *javalib_handle = os::native_java_library();
989 if (javalib_handle == nullptr) {
990 vm_exit_during_initialization("Unable to load java library", nullptr);
991 }
992
993 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, dll_lookup(javalib_handle, "JDK_Canonicalize", nullptr));
994 }
995
996 void ClassLoader::load_jimage_library() {
997 assert(JImageOpen == nullptr, "should not load jimage library twice");
998 char path[JVM_MAXPATHLEN];
999 char ebuf[1024];
1000 void* handle = nullptr;
1001 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1002 handle = os::dll_load(path, ebuf, sizeof ebuf);
1003 }
1004 if (handle == nullptr) {
1005 vm_exit_during_initialization("Unable to load jimage library", path);
1006 }
1007
1008 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, dll_lookup(handle, "JIMAGE_Open", path));
1009 JImageClose = CAST_TO_FN_PTR(JImageClose_t, dll_lookup(handle, "JIMAGE_Close", path));
1010 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, dll_lookup(handle, "JIMAGE_FindResource", path));
1011 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, dll_lookup(handle, "JIMAGE_GetResource", path));
1012 }
1013
1014 int ClassLoader::crc32(int crc, const char* buf, int len) {
1015 return ZipLibrary::crc32(crc, (const jbyte*)buf, len);
1016 }
1017
1018 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1019 // Look up the name in the boot loader's package entry table.
1020 if (name != nullptr) {
1021 TempNewSymbol package_sym = SymbolTable::new_symbol(name);
1022 // Look for the package entry in the boot loader's package entry table.
1023 PackageEntry* package =
1024 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1025
1026 // Return null if package does not exist or if no classes in that package
1027 // have been loaded.
1028 if (package != nullptr && package->has_loaded_class()) {
1029 ModuleEntry* module = package->module();
1030 if (module->location() != nullptr) {
1031 ResourceMark rm(THREAD);
1032 Handle ml = java_lang_String::create_from_str(
1033 module->location()->as_C_string(), THREAD);
1034 return ml();
1035 }
1036 // Return entry on boot loader class path.
1037 Handle cph = java_lang_String::create_from_str(
1038 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1039 return cph();
1040 }
1041 }
1042 return nullptr;
1043 }
1044
1045 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1046 ResourceMark rm(THREAD);
1047 // List of pointers to PackageEntrys that have loaded classes.
1048 PackageEntryTable* pe_table =
1049 ClassLoaderData::the_null_class_loader_data()->packages();
1050 GrowableArray<PackageEntry*>* loaded_class_pkgs = pe_table->get_system_packages();
1051
1052 // Allocate objArray and fill with java.lang.String
1053 objArrayOop r = oopFactory::new_objArray(vmClasses::String_klass(),
1054 loaded_class_pkgs->length(), CHECK_NULL);
1055 objArrayHandle result(THREAD, r);
1056 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1057 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1058 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1059 result->obj_at_put(x, str());
1060 }
1061 return result();
1062 }
1063
1064 // caller needs ResourceMark
1065 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1066 int class_name_len) {
1067 assert(class_name != nullptr, "invariant");
1068 assert((int)strlen(class_name) == class_name_len, "invariant");
1069
1070 static const char class_suffix[] = ".class";
1071 size_t class_suffix_len = sizeof(class_suffix);
1072
1073 char* const file_name = NEW_RESOURCE_ARRAY(char,
1074 class_name_len +
1075 class_suffix_len); // includes term null
1076
1077 strncpy(file_name, class_name, class_name_len);
1078 strncpy(&file_name[class_name_len], class_suffix, class_suffix_len);
1079
1080 return file_name;
1081 }
1082
1083 static ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1084 const GrowableArray<ModuleClassPathList*>* const module_list) {
1085 int num_of_entries = module_list->length();
1086 const Symbol* class_module_name = mod_entry->name();
1087
1088 // Loop through all the modules in either the patch-module or exploded entries looking for module
1089 for (int i = 0; i < num_of_entries; i++) {
1090 ModuleClassPathList* module_cpl = module_list->at(i);
1091 Symbol* module_cpl_name = module_cpl->module_name();
1092
1093 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1094 // Class' module has been located.
1095 return module_cpl->module_first_entry();
1096 }
1097 }
1098 return nullptr;
1099 }
1100
1101
1102 // Search the module list for the class file stream based on the file name and java package
1103 ClassFileStream* ClassLoader::search_module_entries(JavaThread* current,
1104 const GrowableArray<ModuleClassPathList*>* const module_list,
1105 PackageEntry* pkg_entry, // Java package entry derived from the class name
1106 const char* const file_name) {
1107 ClassFileStream* stream = nullptr;
1108
1109 // Find the defining module in the boot loader's module entry table
1110 ModuleEntry* mod_entry = (pkg_entry != nullptr) ? pkg_entry->module() : nullptr;
1111
1112 // If the module system has not defined java.base yet, then
1113 // classes loaded are assumed to be defined to java.base.
1114 // When java.base is eventually defined by the module system,
1115 // all packages of classes that have been previously loaded
1116 // are verified in ModuleEntryTable::verify_javabase_packages().
1117 if (!Universe::is_module_initialized() &&
1118 !ModuleEntryTable::javabase_defined() &&
1119 mod_entry == nullptr) {
1120 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1121 }
1122
1123 // The module must be a named module
1124 ClassPathEntry* e = nullptr;
1125 if (mod_entry != nullptr && mod_entry->is_named()) {
1126 if (module_list == _exploded_entries) {
1127 // The exploded build entries can be added to at any time so a lock is
1128 // needed when searching them.
1129 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1130 MutexLocker ml(current, Module_lock);
1131 e = find_first_module_cpe(mod_entry, module_list);
1132 } else {
1133 e = find_first_module_cpe(mod_entry, module_list);
1134 }
1135 }
1136
1137 // Try to load the class from the module's ClassPathEntry list.
1138 while (e != nullptr) {
1139 stream = e->open_stream(current, file_name);
1140 // No context.check is required since CDS is not supported
1141 // for an exploded modules build or if --patch-module is specified.
1142 if (nullptr != stream) {
1143 return stream;
1144 }
1145 e = e->next();
1146 }
1147 // If the module was located, break out even if the class was not
1148 // located successfully from that module's ClassPathEntry list.
1149 // There will not be another valid entry for that module.
1150 return nullptr;
1151 }
1152
1153 // Called by the boot classloader to load classes
1154 InstanceKlass* ClassLoader::load_class(Symbol* name, PackageEntry* pkg_entry, bool search_append_only, TRAPS) {
1155 assert(name != nullptr, "invariant");
1156
1157 ResourceMark rm(THREAD);
1158 HandleMark hm(THREAD);
1159
1160 const char* const class_name = name->as_C_string();
1161
1162 EventMarkClassLoading m("Loading class %s", class_name);
1163
1164 const char* const file_name = file_name_for_class_name(class_name,
1165 name->utf8_length());
1166 assert(file_name != nullptr, "invariant");
1167
1168 // Lookup stream for parsing .class file
1169 ClassFileStream* stream = nullptr;
1170 s2 classpath_index = 0;
1171 ClassPathEntry* e = nullptr;
1172
1173 // If search_append_only is true, boot loader visibility boundaries are
1174 // set to be _first_append_entry to the end. This includes:
1175 // [-Xbootclasspath/a]; [jvmti appended entries]
1176 //
1177 // If search_append_only is false, boot loader visibility boundaries are
1178 // set to be the --patch-module entries plus the base piece. This includes:
1179 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1180 //
1181
1182 // Load Attempt #1: --patch-module
1183 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1184 // attempt to load the class from those locations specific to the module.
1185 // Specifications to --patch-module can contain a partial number of classes
1186 // that are part of the overall module definition. So if a particular class is not
1187 // found within its module specification, the search should continue to Load Attempt #2.
1188 // Note: The --patch-module entries are never searched if the boot loader's
1189 // visibility boundary is limited to only searching the append entries.
1190 if (_patch_mod_entries != nullptr && !search_append_only) {
1191 assert(!CDSConfig::is_dumping_archive(), "CDS doesn't support --patch-module during dumping");
1192 stream = search_module_entries(THREAD, _patch_mod_entries, pkg_entry, file_name);
1193 }
1194
1195 // Load Attempt #2: [jimage | exploded build]
1196 if (!search_append_only && (nullptr == stream)) {
1197 if (has_jrt_entry()) {
1198 e = _jrt_entry;
1199 stream = _jrt_entry->open_stream(THREAD, file_name);
1200 } else {
1201 // Exploded build - attempt to locate class in its defining module's location.
1202 assert(_exploded_entries != nullptr, "No exploded build entries present");
1203 assert(!CDSConfig::is_dumping_archive(), "CDS dumping doesn't support exploded build");
1204 stream = search_module_entries(THREAD, _exploded_entries, pkg_entry, file_name);
1205 }
1206 }
1207
1208 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1209 if (search_append_only && (nullptr == stream)) {
1210 // For the boot loader append path search, the starting classpath_index
1211 // for the appended piece is always 1 to account for either the
1212 // _jrt_entry or the _exploded_entries.
1213 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1214 classpath_index = 1;
1215
1216 e = first_append_entry();
1217 while (e != nullptr) {
1218 stream = e->open_stream(THREAD, file_name);
1219 if (nullptr != stream) {
1220 break;
1221 }
1222 e = e->next();
1223 ++classpath_index;
1224 }
1225 }
1226
1227 if (nullptr == stream) {
1228 return nullptr;
1229 }
1230
1231 stream->set_verify(ClassLoaderExt::should_verify(classpath_index));
1232
1233 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1234 Handle protection_domain;
1235 ClassLoadInfo cl_info(protection_domain);
1236
1237 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1238 name,
1239 loader_data,
1240 cl_info,
1241 CHECK_NULL);
1242 result->set_classpath_index(classpath_index);
1243 return result;
1244 }
1245
1246 #if INCLUDE_CDS
1247 char* ClassLoader::skip_uri_protocol(char* source) {
1248 if (strncmp(source, "file:", 5) == 0) {
1249 // file: protocol path could start with file:/ or file:///
1250 // locate the char after all the forward slashes
1251 int offset = 5;
1252 while (*(source + offset) == '/') {
1253 offset++;
1254 }
1255 source += offset;
1256 // for non-windows platforms, move back one char as the path begins with a '/'
1257 #ifndef _WINDOWS
1258 source -= 1;
1259 #endif
1260 } else if (strncmp(source, "jrt:/", 5) == 0) {
1261 source += 5;
1262 }
1263 return source;
1264 }
1265
1266 // Record the shared classpath index and loader type for classes loaded
1267 // by the builtin loaders at dump time.
1268 void ClassLoader::record_result(JavaThread* current, InstanceKlass* ik,
1269 const ClassFileStream* stream, bool redefined) {
1270 assert(CDSConfig::is_dumping_archive(), "sanity");
1271 assert(stream != nullptr, "sanity");
1272
1273 if (ik->is_hidden()) {
1274 // We do not archive hidden classes.
1275 return;
1276 }
1277
1278 oop loader = ik->class_loader();
1279 char* src = (char*)stream->source();
1280 if (src == nullptr) {
1281 if (loader == nullptr) {
1282 // JFR classes
1283 ik->set_shared_classpath_index(0);
1284 ik->set_shared_class_loader_type(ClassLoader::BOOT_LOADER);
1285 }
1286 return;
1287 }
1288
1289 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1290
1291 ResourceMark rm(current);
1292 int classpath_index = -1;
1293 PackageEntry* pkg_entry = ik->package();
1294
1295 if (FileMapInfo::get_number_of_shared_paths() > 0) {
1296 // Save the path from the file: protocol or the module name from the jrt: protocol
1297 // if no protocol prefix is found, path is the same as stream->source(). This path
1298 // must be valid since the class has been successfully parsed.
1299 char* path = skip_uri_protocol(src);
1300 assert(path != nullptr, "sanity");
1301 for (int i = 0; i < FileMapInfo::get_number_of_shared_paths(); i++) {
1302 SharedClassPathEntry* ent = FileMapInfo::shared_path(i);
1303 // A shared path has been validated during its creation in ClassLoader::create_class_path_entry(),
1304 // it must be valid here.
1305 assert(ent->name() != nullptr, "sanity");
1306 // If the path (from the class stream source) is the same as the shared
1307 // class or module path, then we have a match.
1308 // src may come from the App/Platform class loaders, which would canonicalize
1309 // the file name. We cannot use strcmp to check for equality against ent->name().
1310 // We must use os::same_files (which is faster than canonicalizing ent->name()).
1311 if (os::same_files(ent->name(), path)) {
1312 // null pkg_entry and pkg_entry in an unnamed module implies the class
1313 // is from the -cp or boot loader append path which consists of -Xbootclasspath/a
1314 // and jvmti appended entries.
1315 if ((pkg_entry == nullptr) || (pkg_entry->in_unnamed_module())) {
1316 // Ensure the index is within the -cp range before assigning
1317 // to the classpath_index.
1318 if (SystemDictionary::is_system_class_loader(loader) &&
1319 (i >= ClassLoaderExt::app_class_paths_start_index()) &&
1320 (i < ClassLoaderExt::app_module_paths_start_index())) {
1321 classpath_index = i;
1322 break;
1323 } else {
1324 if ((i >= 1) &&
1325 (i < ClassLoaderExt::app_class_paths_start_index())) {
1326 // The class must be from boot loader append path which consists of
1327 // -Xbootclasspath/a and jvmti appended entries.
1328 assert(loader == nullptr, "sanity");
1329 classpath_index = i;
1330 break;
1331 }
1332 }
1333 } else {
1334 // A class from a named module from the --module-path. Ensure the index is
1335 // within the --module-path range before assigning to the classpath_index.
1336 if ((pkg_entry != nullptr) && !(pkg_entry->in_unnamed_module()) && (i > 0)) {
1337 if (i >= ClassLoaderExt::app_module_paths_start_index() &&
1338 i < FileMapInfo::get_number_of_shared_paths()) {
1339 classpath_index = i;
1340 break;
1341 }
1342 }
1343 }
1344 }
1345 // for index 0 and the stream->source() is the modules image or has the jrt: protocol.
1346 // The class must be from the runtime modules image.
1347 if (i == 0 && (stream->from_boot_loader_modules_image() || string_starts_with(src, "jrt:"))) {
1348 classpath_index = i;
1349 break;
1350 }
1351 }
1352
1353 // No path entry found for this class: most likely a shared class loaded by the
1354 // user defined classloader.
1355 if (classpath_index < 0 && !SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
1356 assert(ik->shared_classpath_index() < 0, "not assigned yet");
1357 ik->set_shared_classpath_index(UNREGISTERED_INDEX);
1358 SystemDictionaryShared::set_shared_class_misc_info(ik, (ClassFileStream*)stream);
1359 return;
1360 }
1361 } else {
1362 // The shared path table is set up after module system initialization.
1363 // The path table contains no entry before that. Any classes loaded prior
1364 // to the setup of the shared path table must be from the modules image.
1365 assert(stream->from_boot_loader_modules_image(), "stream must be loaded by boot loader from modules image");
1366 assert(FileMapInfo::get_number_of_shared_paths() == 0, "shared path table must not have been setup");
1367 classpath_index = 0;
1368 }
1369
1370 const char* const class_name = ik->name()->as_C_string();
1371 const char* const file_name = file_name_for_class_name(class_name,
1372 ik->name()->utf8_length());
1373 assert(file_name != nullptr, "invariant");
1374 ClassLoaderExt::record_result(checked_cast<s2>(classpath_index), ik, redefined);
1375 }
1376 #endif // INCLUDE_CDS
1377
1378 // Initialize the class loader's access to methods in libzip. Parse and
1379 // process the boot classpath into a list ClassPathEntry objects. Once
1380 // this list has been created, it must not change order (see class PackageInfo)
1381 // it can be appended to and is by jvmti.
1382
1383 void ClassLoader::initialize(TRAPS) {
1384 if (UsePerfData) {
1385 // jvmstat performance counters
1386 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1387 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1388 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1389 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1390 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1391 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1392 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1393 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1394 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1395 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1396 NEWPERFEVENTCOUNTER(_perf_class_init_bytecodes_count, SUN_CLS, "clinitBytecodesCount");
1397
1398 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1399 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1400 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1401 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1402 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1403 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1404 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1405 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1406 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1407 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1408
1409 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, "unsafeDefineClassCalls");
1410 NEWPERFTICKCOUNTER(_perf_secondary_hash_time, SUN_CLS, "secondarySuperHashTime");
1411
1412 NEWPERFTICKCOUNTER(_perf_preload_total_time, SUN_CLS, "preloadTotalTime");
1413 NEWPERFTICKCOUNTER(_perf_preload_time, SUN_CLS, "preloadTime");
1414 NEWPERFTICKCOUNTER(_perf_prelink_time, SUN_CLS, "prelinkTime");
1415 NEWPERFTICKCOUNTER(_perf_preinit_time, SUN_CLS, "preinitTime");
1416 NEWPERFTICKCOUNTER(_perf_preresolve_time, SUN_CLS, "preresolveTime");
1417
1418 NEWPERFTICKCOUNTER(_perf_ik_link_methods_time, SUN_CLS, "linkMethodsTime");
1419 NEWPERFTICKCOUNTER(_perf_method_adapters_time, SUN_CLS, "makeAdaptersTime");
1420 NEWPERFEVENTCOUNTER(_perf_ik_link_methods_count, SUN_CLS, "linkMethodsCount");
1421 NEWPERFEVENTCOUNTER(_perf_method_adapters_count, SUN_CLS, "makeAdaptersCount");
1422
1423 NEWPERFTICKCOUNTERS(_perf_resolve_indy_time, SUN_CLS, "resolve_invokedynamic");
1424 NEWPERFTICKCOUNTERS(_perf_resolve_invokehandle_time, SUN_CLS, "resolve_invokehandle");
1425 NEWPERFTICKCOUNTERS(_perf_resolve_mh_time, SUN_CLS, "resolve_MethodHandle");
1426 NEWPERFTICKCOUNTERS(_perf_resolve_mt_time, SUN_CLS, "resolve_MethodType");
1427
1428 NEWPERFEVENTCOUNTER(_perf_resolve_indy_count, SUN_CLS, "resolve_invokedynamic_count");
1429 NEWPERFEVENTCOUNTER(_perf_resolve_invokehandle_count, SUN_CLS, "resolve_invokehandle_count");
1430 NEWPERFEVENTCOUNTER(_perf_resolve_mh_count, SUN_CLS, "resolve_MethodHandle_count");
1431 NEWPERFEVENTCOUNTER(_perf_resolve_mt_count, SUN_CLS, "resolve_MethodType_count");
1432 }
1433
1434 // lookup java library entry points
1435 load_java_library();
1436 // jimage library entry points are loaded below, in lookup_vm_options
1437 setup_bootstrap_search_path(THREAD);
1438 }
1439
1440 static char* lookup_vm_resource(JImageFile *jimage, const char *jimage_version, const char *path) {
1441 jlong size;
1442 JImageLocationRef location = (*JImageFindResource)(jimage, "java.base", jimage_version, path, &size);
1443 if (location == 0)
1444 return nullptr;
1445 char *val = NEW_C_HEAP_ARRAY(char, size+1, mtClass);
1446 (*JImageGetResource)(jimage, location, val, size);
1447 val[size] = '\0';
1448 return val;
1449 }
1450
1451 // Lookup VM options embedded in the modules jimage file
1452 char* ClassLoader::lookup_vm_options() {
1453 jint error;
1454 char modules_path[JVM_MAXPATHLEN];
1455 const char* fileSep = os::file_separator();
1456
1457 // Initialize jimage library entry points
1458 load_jimage_library();
1459
1460 jio_snprintf(modules_path, JVM_MAXPATHLEN, "%s%slib%smodules", Arguments::get_java_home(), fileSep, fileSep);
1461 JImage_file =(*JImageOpen)(modules_path, &error);
1462 if (JImage_file == nullptr) {
1463 return nullptr;
1464 }
1465
1466 const char *jimage_version = get_jimage_version_string();
1467 char *options = lookup_vm_resource(JImage_file, jimage_version, "jdk/internal/vm/options");
1468 return options;
1469 }
1470
1471 bool ClassLoader::is_module_observable(const char* module_name) {
1472 assert(JImageOpen != nullptr, "jimage library should have been opened");
1473 if (JImage_file == nullptr) {
1474 struct stat st;
1475 const char *path = get_exploded_module_path(module_name, true);
1476 bool res = os::stat(path, &st) == 0;
1477 FREE_C_HEAP_ARRAY(char, path);
1478 return res;
1479 }
1480 jlong size;
1481 const char *jimage_version = get_jimage_version_string();
1482 return (*JImageFindResource)(JImage_file, module_name, jimage_version, "module-info.class", &size) != 0;
1483 }
1484
1485 #if INCLUDE_CDS
1486 void ClassLoader::initialize_shared_path(JavaThread* current) {
1487 if (CDSConfig::is_dumping_archive()) {
1488 ClassLoaderExt::setup_search_paths(current);
1489 }
1490 }
1491
1492 void ClassLoader::initialize_module_path(TRAPS) {
1493 if (CDSConfig::is_dumping_archive()) {
1494 ClassLoaderExt::setup_module_paths(THREAD);
1495 FileMapInfo::allocate_shared_path_table(CHECK);
1496 }
1497 }
1498
1499 // Helper function used by CDS code to get the number of module path
1500 // entries during shared classpath setup time.
1501 int ClassLoader::num_module_path_entries() {
1502 assert(CDSConfig::is_dumping_archive(), "sanity");
1503 int num_entries = 0;
1504 ClassPathEntry* e= ClassLoader::_module_path_entries;
1505 while (e != nullptr) {
1506 num_entries ++;
1507 e = e->next();
1508 }
1509 return num_entries;
1510 }
1511 #endif
1512
1513 jlong ClassLoader::classloader_time_ms() {
1514 return UsePerfData ?
1515 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1516 }
1517
1518 jlong ClassLoader::class_init_bytecodes_count() {
1519 return UsePerfData ? _perf_class_init_bytecodes_count->get_value() : -1;
1520 }
1521
1522 jlong ClassLoader::class_init_count() {
1523 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1524 }
1525
1526 jlong ClassLoader::class_init_time_ms() {
1527 return UsePerfData ?
1528 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1529 }
1530
1531 jlong ClassLoader::class_verify_time_ms() {
1532 return UsePerfData ?
1533 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1534 }
1535
1536 jlong ClassLoader::class_link_count() {
1537 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1538 }
1539
1540 jlong ClassLoader::class_link_time_ms() {
1541 return UsePerfData ?
1542 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1543 }
1544
1545 int ClassLoader::compute_Object_vtable() {
1546 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1547 // code to determine actual value from file
1548 // Would be value '11' if finals were in vtable
1549 int JDK_1_2_Object_vtable_size = 5;
1550 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1551 }
1552
1553
1554 void classLoader_init1() {
1555 EXCEPTION_MARK;
1556 ClassLoader::initialize(THREAD);
1557 if (HAS_PENDING_EXCEPTION) {
1558 vm_exit_during_initialization("ClassLoader::initialize() failed unexpectedly");
1559 }
1560 }
1561
1562 // Complete the ClassPathEntry setup for the boot loader
1563 void ClassLoader::classLoader_init2(JavaThread* current) {
1564 // Setup the list of module/path pairs for --patch-module processing
1565 // This must be done after the SymbolTable is created in order
1566 // to use fast_compare on module names instead of a string compare.
1567 if (Arguments::get_patch_mod_prefix() != nullptr) {
1568 setup_patch_mod_entries();
1569 }
1570
1571 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1572 // to successfully determine if java.base has been patched)
1573 create_javabase();
1574
1575 // Setup the initial java.base/path pair for the exploded build entries.
1576 // As more modules are defined during module system initialization, more
1577 // entries will be added to the exploded build array.
1578 if (!has_jrt_entry()) {
1579 assert(!CDSConfig::is_dumping_archive(), "not supported with exploded module builds");
1580 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1581 // Set up the boot loader's _exploded_entries list. Note that this gets
1582 // done before loading any classes, by the same thread that will
1583 // subsequently do the first class load. So, no lock is needed for this.
1584 assert(_exploded_entries == nullptr, "Should only get initialized once");
1585 _exploded_entries = new (mtModule)
1586 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, mtModule);
1587 add_to_exploded_build_list(current, vmSymbols::java_base());
1588 }
1589 }
1590
1591 char* ClassLoader::get_canonical_path(const char* orig, Thread* thread) {
1592 assert(orig != nullptr, "bad arguments");
1593 // caller needs to allocate ResourceMark for the following output buffer
1594 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
1595 ResourceMark rm(thread);
1596 // os::native_path writes into orig_copy
1597 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(orig)+1);
1598 strcpy(orig_copy, orig);
1599 if ((CanonicalizeEntry)(os::native_path(orig_copy), canonical_path, JVM_MAXPATHLEN) < 0) {
1600 return nullptr;
1601 }
1602 return canonical_path;
1603 }
1604
1605 void ClassLoader::create_javabase() {
1606 JavaThread* current = JavaThread::current();
1607
1608 // Create java.base's module entry for the boot
1609 // class loader prior to loading j.l.Object.
1610 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1611
1612 // Get module entry table
1613 ModuleEntryTable* null_cld_modules = null_cld->modules();
1614 if (null_cld_modules == nullptr) {
1615 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1616 }
1617
1618 {
1619 MutexLocker ml(current, Module_lock);
1620 if (ModuleEntryTable::javabase_moduleEntry() == nullptr) { // may have been inited by CDS.
1621 ModuleEntry* jb_module = null_cld_modules->locked_create_entry(Handle(),
1622 false, vmSymbols::java_base(), nullptr, nullptr, null_cld);
1623 if (jb_module == nullptr) {
1624 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1625 }
1626 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1627 }
1628 }
1629 }
1630
1631 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1632 // they could get inlined by aggressive compiler, an unknown trick, see bug 6966589.
1633 void PerfClassTraceTime::initialize() {
1634 if (!UsePerfData) return;
1635
1636 if (_eventp != nullptr) {
1637 // increment the event counter
1638 _eventp->inc();
1639 }
1640
1641 // stop the current active thread-local timer to measure inclusive time
1642 _prev_active_event = -1;
1643 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1644 if (_timers[i].is_active()) {
1645 assert(_prev_active_event == -1, "should have only one active timer");
1646 _prev_active_event = i;
1647 _timers[i].stop();
1648 }
1649 }
1650
1651 if (_recursion_counters == nullptr || (_recursion_counters[_event_type])++ == 0) {
1652 // start the inclusive timer if not recursively called
1653 _t.start();
1654 }
1655
1656 // start thread-local timer of the given event type
1657 if (!_timers[_event_type].is_active()) {
1658 _timers[_event_type].start();
1659 }
1660 }
1661
1662 PerfClassTraceTime::~PerfClassTraceTime() {
1663 if (!UsePerfData) return;
1664
1665 // stop the thread-local timer as the event completes
1666 // and resume the thread-local timer of the event next on the stack
1667 _timers[_event_type].stop();
1668 jlong selftime = _timers[_event_type].ticks();
1669
1670 if (_prev_active_event >= 0) {
1671 _timers[_prev_active_event].start();
1672 }
1673
1674 if (_recursion_counters != nullptr && --(_recursion_counters[_event_type]) > 0) return;
1675
1676 // increment the counters only on the leaf call
1677 _t.stop();
1678 _timep->inc(_t.ticks());
1679 if (_selftimep != nullptr) {
1680 _selftimep->inc(selftime);
1681 }
1682 // add all class loading related event selftime to the accumulated time counter
1683 ClassLoader::perf_accumulated_time()->inc(selftime);
1684
1685 // reset the timer
1686 _timers[_event_type].reset();
1687 }