1 /*
2 * Copyright (c) 1997, 2019, 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 "jvm.h"
27 #include "jimage.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.inline.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/classLoaderExt.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/modules.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/klassFactory.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/systemDictionaryShared.hpp"
40 #include "classfile/vmSymbols.hpp"
41 #include "compiler/compileBroker.hpp"
42 #include "interpreter/bytecodeStream.hpp"
43 #include "interpreter/oopMapCache.hpp"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "logging/logTag.hpp"
47 #include "memory/allocation.inline.hpp"
48 #include "memory/filemap.hpp"
49 #include "memory/oopFactory.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "oops/instanceKlass.hpp"
53 #include "oops/instanceRefKlass.hpp"
54 #include "oops/method.inline.hpp"
55 #include "oops/objArrayOop.inline.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "oops/symbol.hpp"
58 #include "prims/jvm_misc.hpp"
59 #include "runtime/arguments.hpp"
60 #include "runtime/handles.inline.hpp"
61 #include "runtime/init.hpp"
62 #include "runtime/interfaceSupport.inline.hpp"
63 #include "runtime/java.hpp"
64 #include "runtime/javaCalls.hpp"
65 #include "runtime/os.inline.hpp"
66 #include "runtime/threadCritical.hpp"
67 #include "runtime/timer.hpp"
68 #include "runtime/vm_version.hpp"
69 #include "services/management.hpp"
70 #include "services/threadService.hpp"
71 #include "utilities/classpathStream.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/hashtable.inline.hpp"
74 #include "utilities/macros.hpp"
75
76 // Entry point in java.dll for path canonicalization
77
78 static canonicalize_fn_t CanonicalizeEntry = NULL;
79
80 // Entry points in zip.dll for loading zip/jar file entries
81
82 typedef void * * (*ZipOpen_t)(const char *name, char **pmsg);
83 typedef void (*ZipClose_t)(jzfile *zip);
84 typedef jzentry* (*FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
85 typedef jboolean (*ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
86 typedef jzentry* (*GetNextEntry_t)(jzfile *zip, jint n);
87 typedef jint (*Crc32_t)(jint crc, const jbyte *buf, jint len);
88
89 static ZipOpen_t ZipOpen = NULL;
90 static ZipClose_t ZipClose = NULL;
91 static FindEntry_t FindEntry = NULL;
92 static ReadEntry_t ReadEntry = NULL;
93 static GetNextEntry_t GetNextEntry = NULL;
94 static Crc32_t Crc32 = NULL;
95
96 // Entry points for jimage.dll for loading jimage file entries
97
98 static JImageOpen_t JImageOpen = NULL;
99 static JImageClose_t JImageClose = NULL;
100 static JImagePackageToModule_t JImagePackageToModule = NULL;
101 static JImageFindResource_t JImageFindResource = NULL;
102 static JImageGetResource_t JImageGetResource = NULL;
103 static JImageResourceIterator_t JImageResourceIterator = NULL;
104
105 // Globals
106
107 PerfCounter* ClassLoader::_perf_accumulated_time = NULL;
108 PerfCounter* ClassLoader::_perf_classes_inited = NULL;
109 PerfCounter* ClassLoader::_perf_class_init_time = NULL;
110 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL;
111 PerfCounter* ClassLoader::_perf_classes_verified = NULL;
112 PerfCounter* ClassLoader::_perf_class_verify_time = NULL;
113 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL;
114 PerfCounter* ClassLoader::_perf_classes_linked = NULL;
115 PerfCounter* ClassLoader::_perf_class_link_time = NULL;
116 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL;
117 PerfCounter* ClassLoader::_perf_class_parse_time = NULL;
118 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL;
119 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL;
120 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL;
121 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL;
122 PerfCounter* ClassLoader::_perf_app_classload_time = NULL;
123 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL;
124 PerfCounter* ClassLoader::_perf_app_classload_count = NULL;
125 PerfCounter* ClassLoader::_perf_define_appclasses = NULL;
126 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL;
127 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL;
128 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL;
129 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL;
130 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
131 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
132 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
133 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
134 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
135 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL;
136
137 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL;
138 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL;
139 ClassPathEntry* ClassLoader::_jrt_entry = NULL;
140 ClassPathEntry* ClassLoader::_first_append_entry = NULL;
141 ClassPathEntry* ClassLoader::_last_append_entry = NULL;
142 #if INCLUDE_CDS
143 ClassPathEntry* ClassLoader::_app_classpath_entries = NULL;
144 ClassPathEntry* ClassLoader::_last_app_classpath_entry = NULL;
145 ClassPathEntry* ClassLoader::_module_path_entries = NULL;
146 ClassPathEntry* ClassLoader::_last_module_path_entry = NULL;
147 #endif
148
149 // helper routines
150 bool string_starts_with(const char* str, const char* str_to_find) {
151 size_t str_len = strlen(str);
152 size_t str_to_find_len = strlen(str_to_find);
153 if (str_to_find_len > str_len) {
154 return false;
155 }
156 return (strncmp(str, str_to_find, str_to_find_len) == 0);
157 }
158
159 static const char* get_jimage_version_string() {
160 static char version_string[10] = "";
161 if (version_string[0] == '\0') {
162 jio_snprintf(version_string, sizeof(version_string), "%d.%d",
163 VM_Version::vm_major_version(), VM_Version::vm_minor_version());
164 }
165 return (const char*)version_string;
166 }
167
168 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
169 size_t str_len = strlen(str);
170 size_t str_to_find_len = strlen(str_to_find);
171 if (str_to_find_len > str_len) {
172 return false;
173 }
174 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
175 }
176
177 // Used to obtain the package name from a fully qualified class name.
178 // It is the responsibility of the caller to establish a ResourceMark.
179 const char* ClassLoader::package_from_name(const char* const class_name, bool* bad_class_name) {
180 if (class_name == NULL) {
181 if (bad_class_name != NULL) {
182 *bad_class_name = true;
183 }
184 return NULL;
185 }
186
187 if (bad_class_name != NULL) {
188 *bad_class_name = false;
189 }
190
191 const char* const last_slash = strrchr(class_name, JVM_SIGNATURE_SLASH);
192 if (last_slash == NULL) {
193 // No package name
194 return NULL;
195 }
196
197 char* class_name_ptr = (char*) class_name;
198 // Skip over '['s
199 if (*class_name_ptr == JVM_SIGNATURE_ARRAY) {
200 do {
201 class_name_ptr++;
202 } while (*class_name_ptr == JVM_SIGNATURE_ARRAY);
203
204 // Fully qualified class names should not contain a 'L'.
205 // Set bad_class_name to true to indicate that the package name
206 // could not be obtained due to an error condition.
207 // In this situation, is_same_class_package returns false.
208 if (*class_name_ptr == JVM_SIGNATURE_CLASS) {
209 if (bad_class_name != NULL) {
210 *bad_class_name = true;
211 }
212 return NULL;
213 }
214 }
215
216 int length = last_slash - class_name_ptr;
217
218 // A class name could have just the slash character in the name.
219 if (length <= 0) {
220 // No package name
221 if (bad_class_name != NULL) {
222 *bad_class_name = true;
223 }
224 return NULL;
225 }
226
227 // drop name after last slash (including slash)
228 // Ex., "java/lang/String.class" => "java/lang"
229 char* pkg_name = NEW_RESOURCE_ARRAY(char, length + 1);
230 strncpy(pkg_name, class_name_ptr, length);
231 *(pkg_name+length) = '\0';
232
233 return (const char *)pkg_name;
234 }
235
236 // Given a fully qualified class name, find its defining package in the class loader's
237 // package entry table.
238 PackageEntry* ClassLoader::get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS) {
239 ResourceMark rm(THREAD);
240 const char *pkg_name = ClassLoader::package_from_name(class_name);
241 if (pkg_name == NULL) {
242 return NULL;
243 }
244 PackageEntryTable* pkgEntryTable = loader_data->packages();
245 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(pkg_name);
246 return pkgEntryTable->lookup_only(pkg_symbol);
247 }
248
249 const char* ClassPathEntry::copy_path(const char* path) {
250 char* copy = NEW_C_HEAP_ARRAY(char, strlen(path)+1, mtClass);
251 strcpy(copy, path);
252 return copy;
253 }
254
255 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
256 // construct full path name
257 assert((_dir != NULL) && (name != NULL), "sanity");
258 size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1;
259 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, path_len);
260 int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name);
261 assert(len == (int)(path_len - 1), "sanity");
262 // check if file exists
263 struct stat st;
264 if (os::stat(path, &st) == 0) {
265 // found file, open it
266 int file_handle = os::open(path, 0, 0);
267 if (file_handle != -1) {
268 // read contents into resource array
269 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
270 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
271 // close file
272 os::close(file_handle);
273 // construct ClassFileStream
274 if (num_read == (size_t)st.st_size) {
275 if (UsePerfData) {
276 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
277 }
278 FREE_RESOURCE_ARRAY(char, path, path_len);
279 // Resource allocated
280 return new ClassFileStream(buffer,
281 st.st_size,
282 _dir,
283 ClassFileStream::verify);
284 }
285 }
286 }
287 FREE_RESOURCE_ARRAY(char, path, path_len);
288 return NULL;
289 }
290
291 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name,
292 bool is_boot_append, bool from_class_path_attr) : ClassPathEntry() {
293 _zip = zip;
294 _zip_name = copy_path(zip_name);
295 _from_class_path_attr = from_class_path_attr;
296 }
297
298 ClassPathZipEntry::~ClassPathZipEntry() {
299 (*ZipClose)(_zip);
300 FREE_C_HEAP_ARRAY(char, _zip_name);
301 }
302
303 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
304 // enable call to C land
305 JavaThread* thread = JavaThread::current();
306 ThreadToNativeFromVM ttn(thread);
307 // check whether zip archive contains name
308 jint name_len;
309 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
310 if (entry == NULL) return NULL;
311 u1* buffer;
312 char name_buf[128];
313 char* filename;
314 if (name_len < 128) {
315 filename = name_buf;
316 } else {
317 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
318 }
319
320 // read contents into resource array
321 int size = (*filesize) + ((nul_terminate) ? 1 : 0);
322 buffer = NEW_RESOURCE_ARRAY(u1, size);
323 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
324
325 // return result
326 if (nul_terminate) {
327 buffer[*filesize] = 0;
328 }
329 return buffer;
330 }
331
332 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
333 jint filesize;
334 u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
335 if (buffer == NULL) {
336 return NULL;
337 }
338 if (UsePerfData) {
339 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
340 }
341 // Resource allocated
342 return new ClassFileStream(buffer,
343 filesize,
344 _zip_name,
345 ClassFileStream::verify);
346 }
347
348 // invoke function for each entry in the zip file
349 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
350 JavaThread* thread = JavaThread::current();
351 HandleMark handle_mark(thread);
352 ThreadToNativeFromVM ttn(thread);
353 for (int n = 0; ; n++) {
354 jzentry * ze = ((*GetNextEntry)(_zip, n));
355 if (ze == NULL) break;
356 (*f)(ze->name, context);
357 }
358 }
359
360 DEBUG_ONLY(ClassPathImageEntry* ClassPathImageEntry::_singleton = NULL;)
361
362 void ClassPathImageEntry::close_jimage() {
363 if (_jimage != NULL) {
364 (*JImageClose)(_jimage);
365 _jimage = NULL;
366 }
367 }
368
369 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
370 ClassPathEntry(),
371 _jimage(jimage) {
372 guarantee(jimage != NULL, "jimage file is null");
373 guarantee(name != NULL, "jimage file name is null");
374 assert(_singleton == NULL, "VM supports only one jimage");
375 DEBUG_ONLY(_singleton = this);
376 size_t len = strlen(name) + 1;
377 _name = copy_path(name);
378 }
379
380 ClassPathImageEntry::~ClassPathImageEntry() {
381 assert(_singleton == this, "must be");
382 DEBUG_ONLY(_singleton = NULL);
383
384 FREE_C_HEAP_ARRAY(const char, _name);
385
386 if (_jimage != NULL) {
387 (*JImageClose)(_jimage);
388 _jimage = NULL;
389 }
390 }
391
392 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
393 return open_stream_for_loader(name, ClassLoaderData::the_null_class_loader_data(), THREAD);
394 }
395
396 // For a class in a named module, look it up in the jimage file using this syntax:
397 // /<module-name>/<package-name>/<base-class>
398 //
399 // Assumptions:
400 // 1. There are no unnamed modules in the jimage file.
401 // 2. A package is in at most one module in the jimage file.
402 //
403 ClassFileStream* ClassPathImageEntry::open_stream_for_loader(const char* name, ClassLoaderData* loader_data, TRAPS) {
404 jlong size;
405 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
406
407 if (location == 0) {
408 ResourceMark rm;
409 const char* pkg_name = ClassLoader::package_from_name(name);
410
411 if (pkg_name != NULL) {
412 if (!Universe::is_module_initialized()) {
413 location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
414 } else {
415 PackageEntry* package_entry = ClassLoader::get_package_entry(name, loader_data, CHECK_NULL);
416 if (package_entry != NULL) {
417 ResourceMark rm;
418 // Get the module name
419 ModuleEntry* module = package_entry->module();
420 assert(module != NULL, "Boot classLoader package missing module");
421 assert(module->is_named(), "Boot classLoader package is in unnamed module");
422 const char* module_name = module->name()->as_C_string();
423 if (module_name != NULL) {
424 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
425 }
426 }
427 }
428 }
429 }
430 if (location != 0) {
431 if (UsePerfData) {
432 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
433 }
434 char* data = NEW_RESOURCE_ARRAY(char, size);
435 (*JImageGetResource)(_jimage, location, data, size);
436 // Resource allocated
437 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be");
438 return new ClassFileStream((u1*)data,
439 (int)size,
440 _name,
441 ClassFileStream::verify,
442 true); // from_boot_loader_modules_image
443 }
444
445 return NULL;
446 }
447
448 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
449 const char* module_name,
450 const char* file_name,
451 jlong &size) {
452 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
453 }
454
455 bool ClassPathImageEntry::is_modules_image() const {
456 assert(this == _singleton, "VM supports a single jimage");
457 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be used for jrt entry");
458 return true;
459 }
460
461 #if INCLUDE_CDS
462 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
463 Arguments::assert_is_dumping_archive();
464 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
465 vm_exit_during_initialization(error, message);
466 }
467 #endif
468
469 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
470 _module_name = module_name;
471 _module_first_entry = NULL;
472 _module_last_entry = NULL;
473 }
474
475 ModuleClassPathList::~ModuleClassPathList() {
476 // Clean out each ClassPathEntry on list
477 ClassPathEntry* e = _module_first_entry;
478 while (e != NULL) {
479 ClassPathEntry* next_entry = e->next();
480 delete e;
481 e = next_entry;
482 }
483 }
484
485 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
486 if (new_entry != NULL) {
487 if (_module_last_entry == NULL) {
488 _module_first_entry = _module_last_entry = new_entry;
489 } else {
490 _module_last_entry->set_next(new_entry);
491 _module_last_entry = new_entry;
492 }
493 }
494 }
495
496 void ClassLoader::trace_class_path(const char* msg, const char* name) {
497 LogTarget(Info, class, path) lt;
498 if (lt.is_enabled()) {
499 LogStream ls(lt);
500 if (msg) {
501 ls.print("%s", msg);
502 }
503 if (name) {
504 if (strlen(name) < 256) {
505 ls.print("%s", name);
506 } else {
507 // For very long paths, we need to print each character separately,
508 // as print_cr() has a length limit
509 while (name[0] != '\0') {
510 ls.print("%c", name[0]);
511 name++;
512 }
513 }
514 }
515 ls.cr();
516 }
517 }
518
519 void ClassLoader::setup_bootstrap_search_path() {
520 const char* sys_class_path = Arguments::get_sysclasspath();
521 assert(sys_class_path != NULL, "System boot class path must not be NULL");
522 if (PrintSharedArchiveAndExit) {
523 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
524 // the same as the bootcp of the shared archive.
525 } else {
526 trace_class_path("bootstrap loader class path=", sys_class_path);
527 }
528 setup_boot_search_path(sys_class_path);
529 }
530
531 #if INCLUDE_CDS
532 void ClassLoader::setup_app_search_path(const char *class_path) {
533 Arguments::assert_is_dumping_archive();
534
535 ResourceMark rm;
536 ClasspathStream cp_stream(class_path);
537
538 while (cp_stream.has_next()) {
539 const char* path = cp_stream.get_next();
540 update_class_path_entry_list(path, false, false, false);
541 }
542 }
543
544 void ClassLoader::add_to_module_path_entries(const char* path,
545 ClassPathEntry* entry) {
546 assert(entry != NULL, "ClassPathEntry should not be NULL");
547 Arguments::assert_is_dumping_archive();
548
549 // The entry does not exist, add to the list
550 if (_module_path_entries == NULL) {
551 assert(_last_module_path_entry == NULL, "Sanity");
552 _module_path_entries = _last_module_path_entry = entry;
553 } else {
554 _last_module_path_entry->set_next(entry);
555 _last_module_path_entry = entry;
556 }
557 }
558
559 // Add a module path to the _module_path_entries list.
560 void ClassLoader::update_module_path_entry_list(const char *path, TRAPS) {
561 Arguments::assert_is_dumping_archive();
562 struct stat st;
563 if (os::stat(path, &st) != 0) {
564 tty->print_cr("os::stat error %d (%s). CDS dump aborted (path was \"%s\").",
565 errno, os::errno_name(errno), path);
566 vm_exit_during_initialization();
567 }
568 // File or directory found
569 ClassPathEntry* new_entry = NULL;
570 new_entry = create_class_path_entry(path, &st, true /* throw_exception */,
571 false /*is_boot_append */, false /* from_class_path_attr */, CHECK);
572 if (new_entry == NULL) {
573 return;
574 }
575
576 add_to_module_path_entries(path, new_entry);
577 return;
578 }
579
580 void ClassLoader::setup_module_search_path(const char* path, TRAPS) {
581 update_module_path_entry_list(path, THREAD);
582 }
583
584 #endif // INCLUDE_CDS
585
586 void ClassLoader::close_jrt_image() {
587 // Not applicable for exploded builds
588 if (!ClassLoader::has_jrt_entry()) return;
589 _jrt_entry->close_jimage();
590 }
591
592 // Construct the array of module/path pairs as specified to --patch-module
593 // for the boot loader to search ahead of the jimage, if the class being
594 // loaded is defined to a module that has been specified to --patch-module.
595 void ClassLoader::setup_patch_mod_entries() {
596 Thread* THREAD = Thread::current();
597 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
598 int num_of_entries = patch_mod_args->length();
599
600 // Set up the boot loader's _patch_mod_entries list
601 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
602
603 for (int i = 0; i < num_of_entries; i++) {
604 const char* module_name = (patch_mod_args->at(i))->module_name();
605 Symbol* const module_sym = SymbolTable::new_symbol(module_name);
606 assert(module_sym != NULL, "Failed to obtain Symbol for module name");
607 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
608
609 char* class_path = (patch_mod_args->at(i))->path_string();
610 ResourceMark rm(THREAD);
611 ClasspathStream cp_stream(class_path);
612
613 while (cp_stream.has_next()) {
614 const char* path = cp_stream.get_next();
615 struct stat st;
616 if (os::stat(path, &st) == 0) {
617 // File or directory found
618 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, false, CHECK);
619 // If the path specification is valid, enter it into this module's list
620 if (new_entry != NULL) {
621 module_cpl->add_to_list(new_entry);
622 }
623 }
624 }
625
626 // Record the module into the list of --patch-module entries only if
627 // valid ClassPathEntrys have been created
628 if (module_cpl->module_first_entry() != NULL) {
629 _patch_mod_entries->push(module_cpl);
630 }
631 }
632 }
633
634 // Determine whether the module has been patched via the command-line
635 // option --patch-module
636 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
637 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
638 int table_len = _patch_mod_entries->length();
639 for (int i = 0; i < table_len; i++) {
640 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
641 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
642 return true;
643 }
644 }
645 }
646 return false;
647 }
648
649 // Set up the _jrt_entry if present and boot append path
650 void ClassLoader::setup_boot_search_path(const char *class_path) {
651 EXCEPTION_MARK;
652 ResourceMark rm(THREAD);
653 ClasspathStream cp_stream(class_path);
654 bool set_base_piece = true;
655
656 #if INCLUDE_CDS
657 if (Arguments::is_dumping_archive()) {
658 if (!Arguments::has_jimage()) {
659 vm_exit_during_initialization("CDS is not supported in exploded JDK build", NULL);
660 }
661 }
662 #endif
663
664 while (cp_stream.has_next()) {
665 const char* path = cp_stream.get_next();
666
667 if (set_base_piece) {
668 // The first time through the bootstrap_search setup, it must be determined
669 // what the base or core piece of the boot loader search is. Either a java runtime
670 // image is present or this is an exploded module build situation.
671 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
672 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
673 struct stat st;
674 if (os::stat(path, &st) == 0) {
675 // Directory found
676 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, false, CHECK);
677
678 // Check for a jimage
679 if (Arguments::has_jimage()) {
680 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
681 _jrt_entry = new_entry;
682 assert(new_entry != NULL && new_entry->is_modules_image(), "No java runtime image present");
683 assert(_jrt_entry->jimage() != NULL, "No java runtime image");
684 }
685 } else {
686 // If path does not exist, exit
687 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
688 }
689 set_base_piece = false;
690 } else {
691 // Every entry on the system boot class path after the initial base piece,
692 // which is set by os::set_boot_path(), is considered an appended entry.
693 update_class_path_entry_list(path, false, true, false);
694 }
695 }
696 }
697
698 // During an exploded modules build, each module defined to the boot loader
699 // will be added to the ClassLoader::_exploded_entries array.
700 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
701 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
702 assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
703
704 // Find the module's symbol
705 ResourceMark rm(THREAD);
706 const char *module_name = module_sym->as_C_string();
707 const char *home = Arguments::get_java_home();
708 const char file_sep = os::file_separator()[0];
709 // 10 represents the length of "modules" + 2 file separators + \0
710 size_t len = strlen(home) + strlen(module_name) + 10;
711 char *path = NEW_RESOURCE_ARRAY(char, len);
712 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
713
714 struct stat st;
715 if (os::stat(path, &st) == 0) {
716 // Directory found
717 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, false, CHECK);
718
719 // If the path specification is valid, enter it into this module's list.
720 // There is no need to check for duplicate modules in the exploded entry list,
721 // since no two modules with the same name can be defined to the boot loader.
722 // This is checked at module definition time in Modules::define_module.
723 if (new_entry != NULL) {
724 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
725 module_cpl->add_to_list(new_entry);
726 {
727 MutexLocker ml(Module_lock, THREAD);
728 _exploded_entries->push(module_cpl);
729 }
730 log_info(class, load)("path: %s", path);
731 }
732 }
733 }
734
735 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
736 bool throw_exception,
737 bool is_boot_append,
738 bool from_class_path_attr,
739 TRAPS) {
740 JavaThread* thread = JavaThread::current();
741 ClassPathEntry* new_entry = NULL;
742 if ((st->st_mode & S_IFMT) == S_IFREG) {
743 ResourceMark rm(thread);
744 // Regular file, should be a zip or jimage file
745 // Canonicalized filename
746 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
747 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
748 // This matches the classic VM
749 if (throw_exception) {
750 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
751 } else {
752 return NULL;
753 }
754 }
755 jint error;
756 JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
757 if (jimage != NULL) {
758 new_entry = new ClassPathImageEntry(jimage, canonical_path);
759 } else {
760 char* error_msg = NULL;
761 jzfile* zip;
762 {
763 // enable call to C land
764 ThreadToNativeFromVM ttn(thread);
765 HandleMark hm(thread);
766 zip = (*ZipOpen)(canonical_path, &error_msg);
767 }
768 if (zip != NULL && error_msg == NULL) {
769 new_entry = new ClassPathZipEntry(zip, path, is_boot_append, from_class_path_attr);
770 } else {
771 char *msg;
772 if (error_msg == NULL) {
773 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
774 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
775 } else {
776 int len = (int)(strlen(path) + strlen(error_msg) + 128);
777 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
778 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
779 }
780 // Don't complain about bad jar files added via -Xbootclasspath/a:.
781 if (throw_exception && is_init_completed()) {
782 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
783 } else {
784 return NULL;
785 }
786 }
787 }
788 log_info(class, path)("opened: %s", path);
789 log_info(class, load)("opened: %s", path);
790 } else {
791 // Directory
792 new_entry = new ClassPathDirEntry(path);
793 log_info(class, load)("path: %s", path);
794 }
795 return new_entry;
796 }
797
798
799 // Create a class path zip entry for a given path (return NULL if not found
800 // or zip/JAR file cannot be opened)
801 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
802 // check for a regular file
803 struct stat st;
804 if (os::stat(path, &st) == 0) {
805 if ((st.st_mode & S_IFMT) == S_IFREG) {
806 char canonical_path[JVM_MAXPATHLEN];
807 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
808 char* error_msg = NULL;
809 jzfile* zip;
810 {
811 // enable call to C land
812 JavaThread* thread = JavaThread::current();
813 ThreadToNativeFromVM ttn(thread);
814 HandleMark hm(thread);
815 zip = (*ZipOpen)(canonical_path, &error_msg);
816 }
817 if (zip != NULL && error_msg == NULL) {
818 // create using canonical path
819 return new ClassPathZipEntry(zip, canonical_path, is_boot_append, false);
820 }
821 }
822 }
823 }
824 return NULL;
825 }
826
827 // returns true if entry already on class path
828 bool ClassLoader::contains_append_entry(const char* name) {
829 ClassPathEntry* e = _first_append_entry;
830 while (e != NULL) {
831 // assume zip entries have been canonicalized
832 if (strcmp(name, e->name()) == 0) {
833 return true;
834 }
835 e = e->next();
836 }
837 return false;
838 }
839
840 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
841 if (new_entry != NULL) {
842 if (_last_append_entry == NULL) {
843 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
844 _first_append_entry = _last_append_entry = new_entry;
845 } else {
846 _last_append_entry->set_next(new_entry);
847 _last_append_entry = new_entry;
848 }
849 }
850 }
851
852 // Record the path entries specified in -cp during dump time. The recorded
853 // information will be used at runtime for loading the archived app classes.
854 //
855 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for
856 // loading app classes. Instead, the app class are loaded by the
857 // jdk/internal/loader/ClassLoaders$AppClassLoader instance.
858 void ClassLoader::add_to_app_classpath_entries(const char* path,
859 ClassPathEntry* entry,
860 bool check_for_duplicates) {
861 #if INCLUDE_CDS
862 assert(entry != NULL, "ClassPathEntry should not be NULL");
863 ClassPathEntry* e = _app_classpath_entries;
864 if (check_for_duplicates) {
865 while (e != NULL) {
866 if (strcmp(e->name(), entry->name()) == 0) {
867 // entry already exists
868 return;
869 }
870 e = e->next();
871 }
872 }
873
874 // The entry does not exist, add to the list
875 if (_app_classpath_entries == NULL) {
876 assert(_last_app_classpath_entry == NULL, "Sanity");
877 _app_classpath_entries = _last_app_classpath_entry = entry;
878 } else {
879 _last_app_classpath_entry->set_next(entry);
880 _last_app_classpath_entry = entry;
881 }
882
883 if (entry->is_jar_file()) {
884 ClassLoaderExt::process_jar_manifest(entry, check_for_duplicates);
885 }
886 #endif
887 }
888
889 // Returns true IFF the file/dir exists and the entry was successfully created.
890 bool ClassLoader::update_class_path_entry_list(const char *path,
891 bool check_for_duplicates,
892 bool is_boot_append,
893 bool from_class_path_attr,
894 bool throw_exception) {
895 struct stat st;
896 if (os::stat(path, &st) == 0) {
897 // File or directory found
898 ClassPathEntry* new_entry = NULL;
899 Thread* THREAD = Thread::current();
900 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, from_class_path_attr, CHECK_(false));
901 if (new_entry == NULL) {
902 return false;
903 }
904
905 // Do not reorder the bootclasspath which would break get_system_package().
906 // Add new entry to linked list
907 if (is_boot_append) {
908 add_to_boot_append_entries(new_entry);
909 } else {
910 add_to_app_classpath_entries(path, new_entry, check_for_duplicates);
911 }
912 return true;
913 } else {
914 return false;
915 }
916 }
917
918 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
919 ResourceMark rm;
920 int num_of_entries = module_list->length();
921 for (int i = 0; i < num_of_entries; i++) {
922 ClassPathEntry* e;
923 ModuleClassPathList* mpl = module_list->at(i);
924 tty->print("%s=", mpl->module_name()->as_C_string());
925 e = mpl->module_first_entry();
926 while (e != NULL) {
927 tty->print("%s", e->name());
928 e = e->next();
929 if (e != NULL) {
930 tty->print("%s", os::path_separator());
931 }
932 }
933 tty->print(" ;");
934 }
935 }
936
937 void ClassLoader::print_bootclasspath() {
938 ClassPathEntry* e;
939 tty->print("[bootclasspath= ");
940
941 // Print --patch-module module/path specifications first
942 if (_patch_mod_entries != NULL) {
943 print_module_entry_table(_patch_mod_entries);
944 }
945
946 // [jimage | exploded modules build]
947 if (has_jrt_entry()) {
948 // Print the location of the java runtime image
949 tty->print("%s ;", _jrt_entry->name());
950 } else {
951 // Print exploded module build path specifications
952 if (_exploded_entries != NULL) {
953 print_module_entry_table(_exploded_entries);
954 }
955 }
956
957 // appended entries
958 e = _first_append_entry;
959 while (e != NULL) {
960 tty->print("%s ;", e->name());
961 e = e->next();
962 }
963 tty->print_cr("]");
964 }
965
966 void* ClassLoader::dll_lookup(void* lib, const char* name, const char* path) {
967 void* func = os::dll_lookup(lib, name);
968 if (func == NULL) {
969 char msg[256] = "";
970 jio_snprintf(msg, sizeof(msg), "Could not resolve \"%s\"", name);
971 vm_exit_during_initialization(msg, path);
972 }
973 return func;
974 }
975
976 void ClassLoader::load_java_library() {
977 assert(CanonicalizeEntry == NULL, "should not load java library twice");
978 void *javalib_handle = os::native_java_library();
979 if (javalib_handle == NULL) {
980 vm_exit_during_initialization("Unable to load java library", NULL);
981 }
982
983 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, dll_lookup(javalib_handle, "Canonicalize", NULL));
984 }
985
986 void ClassLoader::load_zip_library() {
987 assert(ZipOpen == NULL, "should not load zip library twice");
988 char path[JVM_MAXPATHLEN];
989 char ebuf[1024];
990 void* handle = NULL;
991 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
992 handle = os::dll_load(path, ebuf, sizeof ebuf);
993 }
994 if (handle == NULL) {
995 vm_exit_during_initialization("Unable to load zip library", path);
996 }
997
998 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, dll_lookup(handle, "ZIP_Open", path));
999 ZipClose = CAST_TO_FN_PTR(ZipClose_t, dll_lookup(handle, "ZIP_Close", path));
1000 FindEntry = CAST_TO_FN_PTR(FindEntry_t, dll_lookup(handle, "ZIP_FindEntry", path));
1001 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, dll_lookup(handle, "ZIP_ReadEntry", path));
1002 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, dll_lookup(handle, "ZIP_GetNextEntry", path));
1003 Crc32 = CAST_TO_FN_PTR(Crc32_t, dll_lookup(handle, "ZIP_CRC32", path));
1004 }
1005
1006 void ClassLoader::load_jimage_library() {
1007 assert(JImageOpen == NULL, "should not load jimage library twice");
1008 char path[JVM_MAXPATHLEN];
1009 char ebuf[1024];
1010 void* handle = NULL;
1011 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1012 handle = os::dll_load(path, ebuf, sizeof ebuf);
1013 }
1014 if (handle == NULL) {
1015 vm_exit_during_initialization("Unable to load jimage library", path);
1016 }
1017
1018 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, dll_lookup(handle, "JIMAGE_Open", path));
1019 JImageClose = CAST_TO_FN_PTR(JImageClose_t, dll_lookup(handle, "JIMAGE_Close", path));
1020 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, dll_lookup(handle, "JIMAGE_PackageToModule", path));
1021 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, dll_lookup(handle, "JIMAGE_FindResource", path));
1022 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, dll_lookup(handle, "JIMAGE_GetResource", path));
1023 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, dll_lookup(handle, "JIMAGE_ResourceIterator", path));
1024 }
1025
1026 int ClassLoader::crc32(int crc, const char* buf, int len) {
1027 return (*Crc32)(crc, (const jbyte*)buf, len);
1028 }
1029
1030 // Function add_package extracts the package from the fully qualified class name
1031 // and checks if the package is in the boot loader's package entry table. If so,
1032 // then it sets the classpath_index in the package entry record.
1033 //
1034 // The classpath_index field is used to find the entry on the boot loader class
1035 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1036 // in an unnamed module. It is also used to indicate (for all packages whose
1037 // classes are loaded by the boot loader) that at least one of the package's
1038 // classes has been loaded.
1039 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1040 assert(fullq_class_name != NULL, "just checking");
1041
1042 // Get package name from fully qualified class name.
1043 ResourceMark rm;
1044 const char *cp = package_from_name(fullq_class_name);
1045 if (cp != NULL) {
1046 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1047 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp);
1048 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1049 if (pkg_entry != NULL) {
1050 assert(classpath_index != -1, "Unexpected classpath_index");
1051 pkg_entry->set_classpath_index(classpath_index);
1052 } else {
1053 return false;
1054 }
1055 }
1056 return true;
1057 }
1058
1059 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1060 // Look up the name in the boot loader's package entry table.
1061 if (name != NULL) {
1062 TempNewSymbol package_sym = SymbolTable::new_symbol(name);
1063 // Look for the package entry in the boot loader's package entry table.
1064 PackageEntry* package =
1065 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1066
1067 // Return NULL if package does not exist or if no classes in that package
1068 // have been loaded.
1069 if (package != NULL && package->has_loaded_class()) {
1070 ModuleEntry* module = package->module();
1071 if (module->location() != NULL) {
1072 ResourceMark rm(THREAD);
1073 Handle ml = java_lang_String::create_from_str(
1074 module->location()->as_C_string(), THREAD);
1075 return ml();
1076 }
1077 // Return entry on boot loader class path.
1078 Handle cph = java_lang_String::create_from_str(
1079 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1080 return cph();
1081 }
1082 }
1083 return NULL;
1084 }
1085
1086 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1087 ResourceMark rm(THREAD);
1088 // List of pointers to PackageEntrys that have loaded classes.
1089 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1090 {
1091 MutexLocker ml(Module_lock, THREAD);
1092
1093 PackageEntryTable* pe_table =
1094 ClassLoaderData::the_null_class_loader_data()->packages();
1095
1096 // Collect the packages that have at least one loaded class.
1097 for (int x = 0; x < pe_table->table_size(); x++) {
1098 for (PackageEntry* package_entry = pe_table->bucket(x);
1099 package_entry != NULL;
1100 package_entry = package_entry->next()) {
1101 if (package_entry->has_loaded_class()) {
1102 loaded_class_pkgs->append(package_entry);
1103 }
1104 }
1105 }
1106 }
1107
1108
1109 // Allocate objArray and fill with java.lang.String
1110 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1111 loaded_class_pkgs->length(), CHECK_NULL);
1112 objArrayHandle result(THREAD, r);
1113 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1114 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1115 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1116 result->obj_at_put(x, str());
1117 }
1118 return result();
1119 }
1120
1121 // caller needs ResourceMark
1122 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1123 int class_name_len) {
1124 assert(class_name != NULL, "invariant");
1125 assert((int)strlen(class_name) == class_name_len, "invariant");
1126
1127 static const char class_suffix[] = ".class";
1128 size_t class_suffix_len = sizeof(class_suffix);
1129
1130 char* const file_name = NEW_RESOURCE_ARRAY(char,
1131 class_name_len +
1132 class_suffix_len); // includes term NULL
1133
1134 strncpy(file_name, class_name, class_name_len);
1135 strncpy(&file_name[class_name_len], class_suffix, class_suffix_len);
1136
1137 return file_name;
1138 }
1139
1140 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1141 const GrowableArray<ModuleClassPathList*>* const module_list) {
1142 int num_of_entries = module_list->length();
1143 const Symbol* class_module_name = mod_entry->name();
1144
1145 // Loop through all the modules in either the patch-module or exploded entries looking for module
1146 for (int i = 0; i < num_of_entries; i++) {
1147 ModuleClassPathList* module_cpl = module_list->at(i);
1148 Symbol* module_cpl_name = module_cpl->module_name();
1149
1150 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1151 // Class' module has been located.
1152 return module_cpl->module_first_entry();
1153 }
1154 }
1155 return NULL;
1156 }
1157
1158
1159 // Search either the patch-module or exploded build entries for class.
1160 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1161 const char* const class_name,
1162 const char* const file_name,
1163 TRAPS) {
1164 ClassFileStream* stream = NULL;
1165
1166 // Find the class' defining module in the boot loader's module entry table
1167 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1168 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1169
1170 // If the module system has not defined java.base yet, then
1171 // classes loaded are assumed to be defined to java.base.
1172 // When java.base is eventually defined by the module system,
1173 // all packages of classes that have been previously loaded
1174 // are verified in ModuleEntryTable::verify_javabase_packages().
1175 if (!Universe::is_module_initialized() &&
1176 !ModuleEntryTable::javabase_defined() &&
1177 mod_entry == NULL) {
1178 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1179 }
1180
1181 // The module must be a named module
1182 ClassPathEntry* e = NULL;
1183 if (mod_entry != NULL && mod_entry->is_named()) {
1184 if (module_list == _exploded_entries) {
1185 // The exploded build entries can be added to at any time so a lock is
1186 // needed when searching them.
1187 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1188 MutexLocker ml(Module_lock, THREAD);
1189 e = find_first_module_cpe(mod_entry, module_list);
1190 } else {
1191 e = find_first_module_cpe(mod_entry, module_list);
1192 }
1193 }
1194
1195 // Try to load the class from the module's ClassPathEntry list.
1196 while (e != NULL) {
1197 stream = e->open_stream(file_name, CHECK_NULL);
1198 // No context.check is required since CDS is not supported
1199 // for an exploded modules build or if --patch-module is specified.
1200 if (NULL != stream) {
1201 return stream;
1202 }
1203 e = e->next();
1204 }
1205 // If the module was located, break out even if the class was not
1206 // located successfully from that module's ClassPathEntry list.
1207 // There will not be another valid entry for that module.
1208 return NULL;
1209 }
1210
1211 // Called by the boot classloader to load classes
1212 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1213 assert(name != NULL, "invariant");
1214 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1215
1216 ResourceMark rm(THREAD);
1217 HandleMark hm(THREAD);
1218
1219 const char* const class_name = name->as_C_string();
1220
1221 EventMark m("loading class %s", class_name);
1222
1223 const char* const file_name = file_name_for_class_name(class_name,
1224 name->utf8_length());
1225 assert(file_name != NULL, "invariant");
1226
1227 // Lookup stream for parsing .class file
1228 ClassFileStream* stream = NULL;
1229 s2 classpath_index = 0;
1230 ClassPathEntry* e = NULL;
1231
1232 // If search_append_only is true, boot loader visibility boundaries are
1233 // set to be _first_append_entry to the end. This includes:
1234 // [-Xbootclasspath/a]; [jvmti appended entries]
1235 //
1236 // If search_append_only is false, boot loader visibility boundaries are
1237 // set to be the --patch-module entries plus the base piece. This includes:
1238 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1239 //
1240
1241 // Load Attempt #1: --patch-module
1242 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1243 // attempt to load the class from those locations specific to the module.
1244 // Specifications to --patch-module can contain a partial number of classes
1245 // that are part of the overall module definition. So if a particular class is not
1246 // found within its module specification, the search should continue to Load Attempt #2.
1247 // Note: The --patch-module entries are never searched if the boot loader's
1248 // visibility boundary is limited to only searching the append entries.
1249 if (_patch_mod_entries != NULL && !search_append_only) {
1250 // At CDS dump time, the --patch-module entries are ignored. That means a
1251 // class is still loaded from the runtime image even if it might
1252 // appear in the _patch_mod_entries. The runtime shared class visibility
1253 // check will determine if a shared class is visible based on the runtime
1254 // environemnt, including the runtime --patch-module setting.
1255 //
1256 // DynamicDumpSharedSpaces requires UseSharedSpaces to be enabled. Since --patch-module
1257 // is not supported with UseSharedSpaces, it is not supported with DynamicDumpSharedSpaces.
1258 assert(!DynamicDumpSharedSpaces, "sanity");
1259 if (!DumpSharedSpaces) {
1260 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1261 }
1262 }
1263
1264 // Load Attempt #2: [jimage | exploded build]
1265 if (!search_append_only && (NULL == stream)) {
1266 if (has_jrt_entry()) {
1267 e = _jrt_entry;
1268 stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1269 } else {
1270 // Exploded build - attempt to locate class in its defining module's location.
1271 assert(_exploded_entries != NULL, "No exploded build entries present");
1272 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1273 }
1274 }
1275
1276 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1277 if (search_append_only && (NULL == stream)) {
1278 // For the boot loader append path search, the starting classpath_index
1279 // for the appended piece is always 1 to account for either the
1280 // _jrt_entry or the _exploded_entries.
1281 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1282 classpath_index = 1;
1283
1284 e = _first_append_entry;
1285 while (e != NULL) {
1286 stream = e->open_stream(file_name, CHECK_NULL);
1287 if (NULL != stream) {
1288 break;
1289 }
1290 e = e->next();
1291 ++classpath_index;
1292 }
1293 }
1294
1295 if (NULL == stream) {
1296 return NULL;
1297 }
1298
1299 stream->set_verify(ClassLoaderExt::should_verify(classpath_index));
1300
1301 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1302 Handle protection_domain;
1303 ClassLoadInfo cl_info(protection_domain);
1304
1305 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1306 name,
1307 loader_data,
1308 cl_info,
1309 THREAD);
1310 if (HAS_PENDING_EXCEPTION) {
1311 if (DumpSharedSpaces) {
1312 log_error(cds)("Preload Error: Failed to load %s", class_name);
1313 }
1314 return NULL;
1315 }
1316
1317 if (!add_package(file_name, classpath_index, THREAD)) {
1318 return NULL;
1319 }
1320
1321 return result;
1322 }
1323
1324 #if INCLUDE_CDS
1325 char* ClassLoader::skip_uri_protocol(char* source) {
1326 if (strncmp(source, "file:", 5) == 0) {
1327 // file: protocol path could start with file:/ or file:///
1328 // locate the char after all the forward slashes
1329 int offset = 5;
1330 while (*(source + offset) == '/') {
1331 offset++;
1332 }
1333 source += offset;
1334 // for non-windows platforms, move back one char as the path begins with a '/'
1335 #ifndef _WINDOWS
1336 source -= 1;
1337 #endif
1338 } else if (strncmp(source, "jrt:/", 5) == 0) {
1339 source += 5;
1340 }
1341 return source;
1342 }
1343
1344 // Record the shared classpath index and loader type for classes loaded
1345 // by the builtin loaders at dump time.
1346 void ClassLoader::record_result(InstanceKlass* ik, const ClassFileStream* stream, TRAPS) {
1347 Arguments::assert_is_dumping_archive();
1348 assert(stream != NULL, "sanity");
1349
1350 if (ik->is_hidden() || ik->is_unsafe_anonymous()) {
1351 // We do not archive hidden or unsafe anonymous classes.
1352 return;
1353 }
1354
1355 oop loader = ik->class_loader();
1356 char* src = (char*)stream->source();
1357 if (src == NULL) {
1358 if (loader == NULL) {
1359 // JFR classes
1360 ik->set_shared_classpath_index(0);
1361 ik->set_class_loader_type(ClassLoader::BOOT_LOADER);
1362 }
1363 return;
1364 }
1365
1366 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1367
1368 ResourceMark rm(THREAD);
1369 int classpath_index = -1;
1370 PackageEntry* pkg_entry = ik->package();
1371
1372 if (FileMapInfo::get_number_of_shared_paths() > 0) {
1373 char* canonical_path_table_entry = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
1374
1375 // save the path from the file: protocol or the module name from the jrt: protocol
1376 // if no protocol prefix is found, path is the same as stream->source()
1377 char* path = skip_uri_protocol(src);
1378 char* canonical_class_src_path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
1379 bool success = get_canonical_path(path, canonical_class_src_path, JVM_MAXPATHLEN);
1380 // The path is from the ClassFileStream. Since a ClassFileStream has been created successfully in functions
1381 // such as ClassLoader::load_class(), its source path must be valid.
1382 assert(success, "must be valid path");
1383 for (int i = 0; i < FileMapInfo::get_number_of_shared_paths(); i++) {
1384 SharedClassPathEntry* ent = FileMapInfo::shared_path(i);
1385 success = get_canonical_path(ent->name(), canonical_path_table_entry, JVM_MAXPATHLEN);
1386 // A shared path has been validated during its creation in ClassLoader::create_class_path_entry(),
1387 // it must be valid here.
1388 assert(success, "must be valid path");
1389 // If the path (from the class stream source) is the same as the shared
1390 // class or module path, then we have a match.
1391 if (strcmp(canonical_path_table_entry, canonical_class_src_path) == 0) {
1392 // NULL pkg_entry and pkg_entry in an unnamed module implies the class
1393 // is from the -cp or boot loader append path which consists of -Xbootclasspath/a
1394 // and jvmti appended entries.
1395 if ((pkg_entry == NULL) || (pkg_entry->in_unnamed_module())) {
1396 // Ensure the index is within the -cp range before assigning
1397 // to the classpath_index.
1398 if (SystemDictionary::is_system_class_loader(loader) &&
1399 (i >= ClassLoaderExt::app_class_paths_start_index()) &&
1400 (i < ClassLoaderExt::app_module_paths_start_index())) {
1401 classpath_index = i;
1402 break;
1403 } else {
1404 if ((i >= 1) &&
1405 (i < ClassLoaderExt::app_class_paths_start_index())) {
1406 // The class must be from boot loader append path which consists of
1407 // -Xbootclasspath/a and jvmti appended entries.
1408 assert(loader == NULL, "sanity");
1409 classpath_index = i;
1410 break;
1411 }
1412 }
1413 } else {
1414 // A class from a named module from the --module-path. Ensure the index is
1415 // within the --module-path range before assigning to the classpath_index.
1416 if ((pkg_entry != NULL) && !(pkg_entry->in_unnamed_module()) && (i > 0)) {
1417 if (i >= ClassLoaderExt::app_module_paths_start_index() &&
1418 i < FileMapInfo::get_number_of_shared_paths()) {
1419 classpath_index = i;
1420 break;
1421 }
1422 }
1423 }
1424 }
1425 // for index 0 and the stream->source() is the modules image or has the jrt: protocol.
1426 // The class must be from the runtime modules image.
1427 if (i == 0 && (stream->from_boot_loader_modules_image() || string_starts_with(src, "jrt:"))) {
1428 classpath_index = i;
1429 break;
1430 }
1431 }
1432
1433 // No path entry found for this class. Must be a shared class loaded by the
1434 // user defined classloader.
1435 if (classpath_index < 0) {
1436 assert(ik->shared_classpath_index() < 0, "Sanity");
1437 ik->set_shared_classpath_index(UNREGISTERED_INDEX);
1438 SystemDictionaryShared::set_shared_class_misc_info(ik, (ClassFileStream*)stream);
1439 return;
1440 }
1441 } else {
1442 // The shared path table is set up after module system initialization.
1443 // The path table contains no entry before that. Any classes loaded prior
1444 // to the setup of the shared path table must be from the modules image.
1445 assert(stream->from_boot_loader_modules_image(), "stream must be loaded by boot loader from modules image");
1446 assert(FileMapInfo::get_number_of_shared_paths() == 0, "shared path table must not have been setup");
1447 classpath_index = 0;
1448 }
1449
1450 const char* const class_name = ik->name()->as_C_string();
1451 const char* const file_name = file_name_for_class_name(class_name,
1452 ik->name()->utf8_length());
1453 assert(file_name != NULL, "invariant");
1454
1455 ClassLoaderExt::record_result(classpath_index, ik, THREAD);
1456 }
1457 #endif // INCLUDE_CDS
1458
1459 // Initialize the class loader's access to methods in libzip. Parse and
1460 // process the boot classpath into a list ClassPathEntry objects. Once
1461 // this list has been created, it must not change order (see class PackageInfo)
1462 // it can be appended to and is by jvmti and the kernel vm.
1463
1464 void ClassLoader::initialize() {
1465 EXCEPTION_MARK;
1466
1467 if (UsePerfData) {
1468 // jvmstat performance counters
1469 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1470 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1471 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1472 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1473 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1474 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1475 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1476 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1477 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1478 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1479
1480 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1481 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1482 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1483 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1484 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1485 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1486 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1487 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1488 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1489 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1490 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1491 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1492 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1493
1494
1495 // The following performance counters are added for measuring the impact
1496 // of the bug fix of 6365597. They are mainly focused on finding out
1497 // the behavior of system & user-defined classloader lock, whether
1498 // ClassLoader.loadClass/findClass is being called synchronized or not.
1499 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1500 "systemLoaderLockContentionRate");
1501 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1502 "nonSystemLoaderLockContentionRate");
1503 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1504 "jvmFindLoadedClassNoLockCalls");
1505 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1506 "jvmDefineClassNoLockCalls");
1507
1508 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1509 "jniDefineClassNoLockCalls");
1510
1511 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1512 "unsafeDefineClassCalls");
1513 }
1514
1515 // lookup java library entry points
1516 load_java_library();
1517 // lookup zip library entry points
1518 load_zip_library();
1519 // jimage library entry points are loaded below, in lookup_vm_options
1520 setup_bootstrap_search_path();
1521 }
1522
1523 char* lookup_vm_resource(JImageFile *jimage, const char *jimage_version, const char *path) {
1524 jlong size;
1525 JImageLocationRef location = (*JImageFindResource)(jimage, "java.base", jimage_version, path, &size);
1526 if (location == 0)
1527 return NULL;
1528 char *val = NEW_C_HEAP_ARRAY(char, size+1, mtClass);
1529 (*JImageGetResource)(jimage, location, val, size);
1530 val[size] = '\0';
1531 return val;
1532 }
1533
1534 // Lookup VM options embedded in the modules jimage file
1535 char* ClassLoader::lookup_vm_options() {
1536 jint error;
1537 char modules_path[JVM_MAXPATHLEN];
1538 const char* fileSep = os::file_separator();
1539
1540 // Initialize jimage library entry points
1541 load_jimage_library();
1542
1543 jio_snprintf(modules_path, JVM_MAXPATHLEN, "%s%slib%smodules", Arguments::get_java_home(), fileSep, fileSep);
1544 JImageFile* jimage =(*JImageOpen)(modules_path, &error);
1545 if (jimage == NULL) {
1546 return NULL;
1547 }
1548
1549 const char *jimage_version = get_jimage_version_string();
1550 char *options = lookup_vm_resource(jimage, jimage_version, "jdk/internal/vm/options");
1551
1552 (*JImageClose)(jimage);
1553 return options;
1554 }
1555
1556 #if INCLUDE_CDS
1557 void ClassLoader::initialize_shared_path() {
1558 if (Arguments::is_dumping_archive()) {
1559 ClassLoaderExt::setup_search_paths();
1560 }
1561 }
1562
1563 void ClassLoader::initialize_module_path(TRAPS) {
1564 if (Arguments::is_dumping_archive()) {
1565 ClassLoaderExt::setup_module_paths(THREAD);
1566 FileMapInfo::allocate_shared_path_table();
1567 }
1568 }
1569 #endif
1570
1571 jlong ClassLoader::classloader_time_ms() {
1572 return UsePerfData ?
1573 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1574 }
1575
1576 jlong ClassLoader::class_init_count() {
1577 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1578 }
1579
1580 jlong ClassLoader::class_init_time_ms() {
1581 return UsePerfData ?
1582 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1583 }
1584
1585 jlong ClassLoader::class_verify_time_ms() {
1586 return UsePerfData ?
1587 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1588 }
1589
1590 jlong ClassLoader::class_link_count() {
1591 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1592 }
1593
1594 jlong ClassLoader::class_link_time_ms() {
1595 return UsePerfData ?
1596 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1597 }
1598
1599 int ClassLoader::compute_Object_vtable() {
1600 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1601 // code to determine actual value from file
1602 // Would be value '11' if finals were in vtable
1603 int JDK_1_2_Object_vtable_size = 5;
1604 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1605 }
1606
1607
1608 void classLoader_init1() {
1609 ClassLoader::initialize();
1610 }
1611
1612 // Complete the ClassPathEntry setup for the boot loader
1613 void ClassLoader::classLoader_init2(TRAPS) {
1614 // Setup the list of module/path pairs for --patch-module processing
1615 // This must be done after the SymbolTable is created in order
1616 // to use fast_compare on module names instead of a string compare.
1617 if (Arguments::get_patch_mod_prefix() != NULL) {
1618 setup_patch_mod_entries();
1619 }
1620
1621 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1622 // to successfully determine if java.base has been patched)
1623 create_javabase();
1624
1625 // Setup the initial java.base/path pair for the exploded build entries.
1626 // As more modules are defined during module system initialization, more
1627 // entries will be added to the exploded build array.
1628 if (!has_jrt_entry()) {
1629 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1630 assert(!DynamicDumpSharedSpaces, "DynamicDumpSharedSpaces not supported with exploded module builds");
1631 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1632 // Set up the boot loader's _exploded_entries list. Note that this gets
1633 // done before loading any classes, by the same thread that will
1634 // subsequently do the first class load. So, no lock is needed for this.
1635 assert(_exploded_entries == NULL, "Should only get initialized once");
1636 _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1637 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
1638 add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1639 }
1640 }
1641
1642 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1643 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1644 JavaThread* THREAD = JavaThread::current();
1645 JNIEnv* env = THREAD->jni_environment();
1646 ResourceMark rm(THREAD);
1647
1648 // os::native_path writes into orig_copy
1649 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1650 strcpy(orig_copy, orig);
1651 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1652 return false;
1653 }
1654 return true;
1655 }
1656
1657 void ClassLoader::create_javabase() {
1658 Thread* THREAD = Thread::current();
1659
1660 // Create java.base's module entry for the boot
1661 // class loader prior to loading j.l.Ojbect.
1662 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1663
1664 // Get module entry table
1665 ModuleEntryTable* null_cld_modules = null_cld->modules();
1666 if (null_cld_modules == NULL) {
1667 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1668 }
1669
1670 {
1671 MutexLocker ml(Module_lock, THREAD);
1672 ModuleEntry* jb_module = null_cld_modules->locked_create_entry(Handle(),
1673 false, vmSymbols::java_base(), NULL, NULL, null_cld);
1674 if (jb_module == NULL) {
1675 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1676 }
1677 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1678 }
1679 }
1680
1681 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1682 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1683 void PerfClassTraceTime::initialize() {
1684 if (!UsePerfData) return;
1685
1686 if (_eventp != NULL) {
1687 // increment the event counter
1688 _eventp->inc();
1689 }
1690
1691 // stop the current active thread-local timer to measure inclusive time
1692 _prev_active_event = -1;
1693 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1694 if (_timers[i].is_active()) {
1695 assert(_prev_active_event == -1, "should have only one active timer");
1696 _prev_active_event = i;
1697 _timers[i].stop();
1698 }
1699 }
1700
1701 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1702 // start the inclusive timer if not recursively called
1703 _t.start();
1704 }
1705
1706 // start thread-local timer of the given event type
1707 if (!_timers[_event_type].is_active()) {
1708 _timers[_event_type].start();
1709 }
1710 }
1711
1712 PerfClassTraceTime::~PerfClassTraceTime() {
1713 if (!UsePerfData) return;
1714
1715 // stop the thread-local timer as the event completes
1716 // and resume the thread-local timer of the event next on the stack
1717 _timers[_event_type].stop();
1718 jlong selftime = _timers[_event_type].ticks();
1719
1720 if (_prev_active_event >= 0) {
1721 _timers[_prev_active_event].start();
1722 }
1723
1724 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1725
1726 // increment the counters only on the leaf call
1727 _t.stop();
1728 _timep->inc(_t.ticks());
1729 if (_selftimep != NULL) {
1730 _selftimep->inc(selftime);
1731 }
1732 // add all class loading related event selftime to the accumulated time counter
1733 ClassLoader::perf_accumulated_time()->inc(selftime);
1734
1735 // reset the timer
1736 _timers[_event_type].reset();
1737 }