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 points in zip.dll for loading zip/jar file entries
77
78 typedef void * * (*ZipOpen_t)(const char *name, char **pmsg);
79 typedef void (*ZipClose_t)(jzfile *zip);
80 typedef jzentry* (*FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
81 typedef jboolean (*ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
82 typedef jzentry* (*GetNextEntry_t)(jzfile *zip, jint n);
83 typedef jboolean (*ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
84 typedef jint (*Crc32_t)(jint crc, const jbyte *buf, jint len);
85
86 static ZipOpen_t ZipOpen = NULL;
87 static ZipClose_t ZipClose = NULL;
88 static FindEntry_t FindEntry = NULL;
89 static ReadEntry_t ReadEntry = NULL;
90 static GetNextEntry_t GetNextEntry = NULL;
91 static canonicalize_fn_t CanonicalizeEntry = NULL;
92 static ZipInflateFully_t ZipInflateFully = NULL;
93 static Crc32_t Crc32 = NULL;
94
95 // Entry points for jimage.dll for loading jimage file entries
96
97 static JImageOpen_t JImageOpen = NULL;
98 static JImageClose_t JImageClose = NULL;
99 static JImagePackageToModule_t JImagePackageToModule = NULL;
100 static JImageFindResource_t JImageFindResource = NULL;
101 static JImageGetResource_t JImageGetResource = NULL;
102 static JImageResourceIterator_t JImageResourceIterator = NULL;
103
104 // Globals
105
106 PerfCounter* ClassLoader::_perf_accumulated_time = NULL;
107 PerfCounter* ClassLoader::_perf_classes_inited = NULL;
108 PerfCounter* ClassLoader::_perf_class_init_time = NULL;
109 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL;
110 PerfCounter* ClassLoader::_perf_classes_verified = NULL;
111 PerfCounter* ClassLoader::_perf_class_verify_time = NULL;
112 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL;
113 PerfCounter* ClassLoader::_perf_classes_linked = NULL;
114 PerfCounter* ClassLoader::_perf_class_link_time = NULL;
115 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL;
116 PerfCounter* ClassLoader::_perf_class_parse_time = NULL;
117 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL;
118 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL;
119 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL;
120 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL;
121 PerfCounter* ClassLoader::_perf_app_classload_time = NULL;
122 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL;
123 PerfCounter* ClassLoader::_perf_app_classload_count = NULL;
124 PerfCounter* ClassLoader::_perf_define_appclasses = NULL;
125 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL;
126 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL;
127 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL;
128 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL;
129 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
130 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
131 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
132 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
133 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
134 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL;
135
136 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL;
137 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL;
138 ClassPathEntry* ClassLoader::_jrt_entry = NULL;
139 ClassPathEntry* ClassLoader::_first_append_entry = NULL;
140 ClassPathEntry* ClassLoader::_last_append_entry = NULL;
141 #if INCLUDE_CDS
142 ClassPathEntry* ClassLoader::_app_classpath_entries = NULL;
143 ClassPathEntry* ClassLoader::_last_app_classpath_entry = NULL;
144 ClassPathEntry* ClassLoader::_module_path_entries = NULL;
145 ClassPathEntry* ClassLoader::_last_module_path_entry = NULL;
146 #endif
147
148 // helper routines
149 bool string_starts_with(const char* str, const char* str_to_find) {
150 size_t str_len = strlen(str);
151 size_t str_to_find_len = strlen(str_to_find);
152 if (str_to_find_len > str_len) {
153 return false;
154 }
155 return (strncmp(str, str_to_find, str_to_find_len) == 0);
156 }
157
158 static const char* get_jimage_version_string() {
159 static char version_string[10] = "";
160 if (version_string[0] == '\0') {
161 jio_snprintf(version_string, sizeof(version_string), "%d.%d",
162 VM_Version::vm_major_version(), VM_Version::vm_minor_version());
163 }
164 return (const char*)version_string;
165 }
166
167 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
168 size_t str_len = strlen(str);
169 size_t str_to_find_len = strlen(str_to_find);
170 if (str_to_find_len > str_len) {
171 return false;
172 }
173 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
174 }
175
176 // Used to obtain the package name from a fully qualified class name.
177 // It is the responsibility of the caller to establish a ResourceMark.
178 const char* ClassLoader::package_from_name(const char* const class_name, bool* bad_class_name) {
179 if (class_name == NULL) {
180 if (bad_class_name != NULL) {
181 *bad_class_name = true;
182 }
183 return NULL;
184 }
185
186 if (bad_class_name != NULL) {
187 *bad_class_name = false;
188 }
189
190 const char* const last_slash = strrchr(class_name, '/');
191 if (last_slash == NULL) {
192 // No package name
193 return NULL;
194 }
195
196 char* class_name_ptr = (char*) class_name;
197 // Skip over '['s
198 if (*class_name_ptr == '[') {
199 do {
200 class_name_ptr++;
201 } while (*class_name_ptr == '[');
202
203 // Fully qualified class names should not contain a 'L'.
204 // Set bad_class_name to true to indicate that the package name
205 // could not be obtained due to an error condition.
206 // In this situation, is_same_class_package returns false.
207 if (*class_name_ptr == 'L') {
208 if (bad_class_name != NULL) {
209 *bad_class_name = true;
210 }
211 return NULL;
212 }
213 }
214
215 int length = last_slash - class_name_ptr;
216
217 // A class name could have just the slash character in the name.
218 if (length <= 0) {
219 // No package name
220 if (bad_class_name != NULL) {
221 *bad_class_name = true;
222 }
223 return NULL;
224 }
225
226 // drop name after last slash (including slash)
227 // Ex., "java/lang/String.class" => "java/lang"
228 char* pkg_name = NEW_RESOURCE_ARRAY(char, length + 1);
229 strncpy(pkg_name, class_name_ptr, length);
230 *(pkg_name+length) = '\0';
231
232 return (const char *)pkg_name;
233 }
234
235 // Given a fully qualified class name, find its defining package in the class loader's
236 // package entry table.
237 PackageEntry* ClassLoader::get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS) {
238 ResourceMark rm(THREAD);
239 const char *pkg_name = ClassLoader::package_from_name(class_name);
240 if (pkg_name == NULL) {
241 return NULL;
242 }
243 PackageEntryTable* pkgEntryTable = loader_data->packages();
244 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(pkg_name);
245 return pkgEntryTable->lookup_only(pkg_symbol);
246 }
247
248 const char* ClassPathEntry::copy_path(const char* path) {
249 char* copy = NEW_C_HEAP_ARRAY(char, strlen(path)+1, mtClass);
250 strcpy(copy, path);
251 return copy;
252 }
253
254 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
255 // construct full path name
256 assert((_dir != NULL) && (name != NULL), "sanity");
257 size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1;
258 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, path_len);
259 int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name);
260 assert(len == (int)(path_len - 1), "sanity");
261 // check if file exists
262 struct stat st;
263 if (os::stat(path, &st) == 0) {
264 // found file, open it
265 int file_handle = os::open(path, 0, 0);
266 if (file_handle != -1) {
267 // read contents into resource array
268 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
269 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
270 // close file
271 os::close(file_handle);
272 // construct ClassFileStream
273 if (num_read == (size_t)st.st_size) {
274 if (UsePerfData) {
275 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
276 }
277 FREE_RESOURCE_ARRAY(char, path, path_len);
278 // Resource allocated
279 return new ClassFileStream(buffer,
280 st.st_size,
281 _dir,
282 ClassFileStream::verify);
283 }
284 }
285 }
286 FREE_RESOURCE_ARRAY(char, path, path_len);
287 return NULL;
288 }
289
290 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name,
291 bool is_boot_append, bool from_class_path_attr) : ClassPathEntry() {
292 _zip = zip;
293 _zip_name = copy_path(zip_name);
294 _from_class_path_attr = from_class_path_attr;
295 }
296
297 ClassPathZipEntry::~ClassPathZipEntry() {
298 if (ZipClose != NULL) {
299 (*ZipClose)(_zip);
300 }
301 FREE_C_HEAP_ARRAY(char, _zip_name);
302 }
303
304 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
305 // enable call to C land
306 JavaThread* thread = JavaThread::current();
307 ThreadToNativeFromVM ttn(thread);
308 // check whether zip archive contains name
309 jint name_len;
310 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
311 if (entry == NULL) return NULL;
312 u1* buffer;
313 char name_buf[128];
314 char* filename;
315 if (name_len < 128) {
316 filename = name_buf;
317 } else {
318 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
319 }
320
321 // read contents into resource array
322 int size = (*filesize) + ((nul_terminate) ? 1 : 0);
323 buffer = NEW_RESOURCE_ARRAY(u1, size);
324 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
325
326 // return result
327 if (nul_terminate) {
328 buffer[*filesize] = 0;
329 }
330 return buffer;
331 }
332
333 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
334 jint filesize;
335 u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
336 if (buffer == NULL) {
337 return NULL;
338 }
339 if (UsePerfData) {
340 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
341 }
342 // Resource allocated
343 return new ClassFileStream(buffer,
344 filesize,
345 _zip_name,
346 ClassFileStream::verify);
347 }
348
349 // invoke function for each entry in the zip file
350 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
351 JavaThread* thread = JavaThread::current();
352 HandleMark handle_mark(thread);
353 ThreadToNativeFromVM ttn(thread);
354 for (int n = 0; ; n++) {
355 jzentry * ze = ((*GetNextEntry)(_zip, n));
356 if (ze == NULL) break;
357 (*f)(ze->name, context);
358 }
359 }
360
361 DEBUG_ONLY(ClassPathImageEntry* ClassPathImageEntry::_singleton = NULL;)
362
363 void ClassPathImageEntry::close_jimage() {
364 if (_jimage != NULL) {
365 (*JImageClose)(_jimage);
366 _jimage = NULL;
367 }
368 }
369
370 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
371 ClassPathEntry(),
372 _jimage(jimage) {
373 guarantee(jimage != NULL, "jimage file is null");
374 guarantee(name != NULL, "jimage file name is null");
375 assert(_singleton == NULL, "VM supports only one jimage");
376 DEBUG_ONLY(_singleton = this);
377 size_t len = strlen(name) + 1;
378 _name = copy_path(name);
379 }
380
381 ClassPathImageEntry::~ClassPathImageEntry() {
382 assert(_singleton == this, "must be");
383 DEBUG_ONLY(_singleton = NULL);
384
385 FREE_C_HEAP_ARRAY(const char, _name);
386
387 if (_jimage != NULL) {
388 (*JImageClose)(_jimage);
389 _jimage = NULL;
390 }
391 }
392
393 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
394 return open_stream_for_loader(name, ClassLoaderData::the_null_class_loader_data(), THREAD);
395 }
396
397 // For a class in a named module, look it up in the jimage file using this syntax:
398 // /<module-name>/<package-name>/<base-class>
399 //
400 // Assumptions:
401 // 1. There are no unnamed modules in the jimage file.
402 // 2. A package is in at most one module in the jimage file.
403 //
404 ClassFileStream* ClassPathImageEntry::open_stream_for_loader(const char* name, ClassLoaderData* loader_data, TRAPS) {
405 jlong size;
406 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
407
408 if (location == 0) {
409 ResourceMark rm;
410 const char* pkg_name = ClassLoader::package_from_name(name);
411
412 if (pkg_name != NULL) {
413 if (!Universe::is_module_initialized()) {
414 location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
415 } else {
416 PackageEntry* package_entry = ClassLoader::get_package_entry(name, loader_data, CHECK_NULL);
417 if (package_entry != NULL) {
418 ResourceMark rm;
419 // Get the module name
420 ModuleEntry* module = package_entry->module();
421 assert(module != NULL, "Boot classLoader package missing module");
422 assert(module->is_named(), "Boot classLoader package is in unnamed module");
423 const char* module_name = module->name()->as_C_string();
424 if (module_name != NULL) {
425 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
426 }
427 }
428 }
429 }
430 }
431 if (location != 0) {
432 if (UsePerfData) {
433 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
434 }
435 char* data = NEW_RESOURCE_ARRAY(char, size);
436 (*JImageGetResource)(_jimage, location, data, size);
437 // Resource allocated
438 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be");
439 return new ClassFileStream((u1*)data,
440 (int)size,
441 _name,
442 ClassFileStream::verify,
443 true); // from_boot_loader_modules_image
444 }
445
446 return NULL;
447 }
448
449 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
450 const char* module_name,
451 const char* file_name,
452 jlong &size) {
453 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
454 }
455
456 bool ClassPathImageEntry::is_modules_image() const {
457 assert(this == _singleton, "VM supports a single jimage");
458 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be used for jrt entry");
459 return true;
460 }
461
462 #if INCLUDE_CDS
463 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
464 Arguments::assert_is_dumping_archive();
465 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
466 vm_exit_during_initialization(error, message);
467 }
468 #endif
469
470 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
471 _module_name = module_name;
472 _module_first_entry = NULL;
473 _module_last_entry = NULL;
474 }
475
476 ModuleClassPathList::~ModuleClassPathList() {
477 // Clean out each ClassPathEntry on list
478 ClassPathEntry* e = _module_first_entry;
479 while (e != NULL) {
480 ClassPathEntry* next_entry = e->next();
481 delete e;
482 e = next_entry;
483 }
484 }
485
486 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
487 if (new_entry != NULL) {
488 if (_module_last_entry == NULL) {
489 _module_first_entry = _module_last_entry = new_entry;
490 } else {
491 _module_last_entry->set_next(new_entry);
492 _module_last_entry = new_entry;
493 }
494 }
495 }
496
497 void ClassLoader::trace_class_path(const char* msg, const char* name) {
498 LogTarget(Info, class, path) lt;
499 if (lt.is_enabled()) {
500 LogStream ls(lt);
501 if (msg) {
502 ls.print("%s", msg);
503 }
504 if (name) {
505 if (strlen(name) < 256) {
506 ls.print("%s", name);
507 } else {
508 // For very long paths, we need to print each character separately,
509 // as print_cr() has a length limit
510 while (name[0] != '\0') {
511 ls.print("%c", name[0]);
512 name++;
513 }
514 }
515 }
516 ls.cr();
517 }
518 }
519
520 void ClassLoader::setup_bootstrap_search_path() {
521 const char* sys_class_path = Arguments::get_sysclasspath();
522 assert(sys_class_path != NULL, "System boot class path must not be NULL");
523 if (PrintSharedArchiveAndExit) {
524 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
525 // the same as the bootcp of the shared archive.
526 } else {
527 trace_class_path("bootstrap loader class path=", sys_class_path);
528 }
529 setup_boot_search_path(sys_class_path);
530 }
531
532 #if INCLUDE_CDS
533 void ClassLoader::setup_app_search_path(const char *class_path) {
534 Arguments::assert_is_dumping_archive();
535
536 ResourceMark rm;
537 ClasspathStream cp_stream(class_path);
538
539 while (cp_stream.has_next()) {
540 const char* path = cp_stream.get_next();
541 update_class_path_entry_list(path, false, false, false);
542 }
543 }
544
545 void ClassLoader::add_to_module_path_entries(const char* path,
546 ClassPathEntry* entry) {
547 assert(entry != NULL, "ClassPathEntry should not be NULL");
548 Arguments::assert_is_dumping_archive();
549
550 // The entry does not exist, add to the list
551 if (_module_path_entries == NULL) {
552 assert(_last_module_path_entry == NULL, "Sanity");
553 _module_path_entries = _last_module_path_entry = entry;
554 } else {
555 _last_module_path_entry->set_next(entry);
556 _last_module_path_entry = entry;
557 }
558 }
559
560 // Add a module path to the _module_path_entries list.
561 void ClassLoader::update_module_path_entry_list(const char *path, TRAPS) {
562 Arguments::assert_is_dumping_archive();
563 struct stat st;
564 if (os::stat(path, &st) != 0) {
565 tty->print_cr("os::stat error %d (%s). CDS dump aborted (path was \"%s\").",
566 errno, os::errno_name(errno), path);
567 vm_exit_during_initialization();
568 }
569 // File or directory found
570 ClassPathEntry* new_entry = NULL;
571 new_entry = create_class_path_entry(path, &st, true /* throw_exception */,
572 false /*is_boot_append */, false /* from_class_path_attr */, CHECK);
573 if (new_entry == NULL) {
574 return;
575 }
576
577 add_to_module_path_entries(path, new_entry);
578 return;
579 }
580
581 void ClassLoader::setup_module_search_path(const char* path, TRAPS) {
582 update_module_path_entry_list(path, THREAD);
583 }
584
585 #endif // INCLUDE_CDS
586
587 void ClassLoader::close_jrt_image() {
588 // Not applicable for exploded builds
589 if (!ClassLoader::has_jrt_entry()) return;
590 _jrt_entry->close_jimage();
591 }
592
593 // Construct the array of module/path pairs as specified to --patch-module
594 // for the boot loader to search ahead of the jimage, if the class being
595 // loaded is defined to a module that has been specified to --patch-module.
596 void ClassLoader::setup_patch_mod_entries() {
597 Thread* THREAD = Thread::current();
598 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
599 int num_of_entries = patch_mod_args->length();
600
601 // Set up the boot loader's _patch_mod_entries list
602 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
603
604 for (int i = 0; i < num_of_entries; i++) {
605 const char* module_name = (patch_mod_args->at(i))->module_name();
606 Symbol* const module_sym = SymbolTable::new_symbol(module_name);
607 assert(module_sym != NULL, "Failed to obtain Symbol for module name");
608 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
609
610 char* class_path = (patch_mod_args->at(i))->path_string();
611 ResourceMark rm(THREAD);
612 ClasspathStream cp_stream(class_path);
613
614 while (cp_stream.has_next()) {
615 const char* path = cp_stream.get_next();
616 struct stat st;
617 if (os::stat(path, &st) == 0) {
618 // File or directory found
619 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, false, CHECK);
620 // If the path specification is valid, enter it into this module's list
621 if (new_entry != NULL) {
622 module_cpl->add_to_list(new_entry);
623 }
624 }
625 }
626
627 // Record the module into the list of --patch-module entries only if
628 // valid ClassPathEntrys have been created
629 if (module_cpl->module_first_entry() != NULL) {
630 _patch_mod_entries->push(module_cpl);
631 }
632 }
633 }
634
635 // Determine whether the module has been patched via the command-line
636 // option --patch-module
637 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
638 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
639 int table_len = _patch_mod_entries->length();
640 for (int i = 0; i < table_len; i++) {
641 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
642 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
643 return true;
644 }
645 }
646 }
647 return false;
648 }
649
650 // Set up the _jrt_entry if present and boot append path
651 void ClassLoader::setup_boot_search_path(const char *class_path) {
652 EXCEPTION_MARK;
653 ResourceMark rm(THREAD);
654 ClasspathStream cp_stream(class_path);
655 bool set_base_piece = true;
656
657 #if INCLUDE_CDS
658 if (Arguments::is_dumping_archive()) {
659 if (!Arguments::has_jimage()) {
660 vm_exit_during_initialization("CDS is not supported in exploded JDK build", NULL);
661 }
662 }
663 #endif
664
665 while (cp_stream.has_next()) {
666 const char* path = cp_stream.get_next();
667
668 if (set_base_piece) {
669 // The first time through the bootstrap_search setup, it must be determined
670 // what the base or core piece of the boot loader search is. Either a java runtime
671 // image is present or this is an exploded module build situation.
672 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
673 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
674 struct stat st;
675 if (os::stat(path, &st) == 0) {
676 // Directory found
677 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, false, CHECK);
678
679 // Check for a jimage
680 if (Arguments::has_jimage()) {
681 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
682 _jrt_entry = new_entry;
683 assert(new_entry != NULL && new_entry->is_modules_image(), "No java runtime image present");
684 assert(_jrt_entry->jimage() != NULL, "No java runtime image");
685 }
686 } else {
687 // If path does not exist, exit
688 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
689 }
690 set_base_piece = false;
691 } else {
692 // Every entry on the system boot class path after the initial base piece,
693 // which is set by os::set_boot_path(), is considered an appended entry.
694 update_class_path_entry_list(path, false, true, false);
695 }
696 }
697 }
698
699 // During an exploded modules build, each module defined to the boot loader
700 // will be added to the ClassLoader::_exploded_entries array.
701 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
702 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
703 assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
704
705 // Find the module's symbol
706 ResourceMark rm(THREAD);
707 const char *module_name = module_sym->as_C_string();
708 const char *home = Arguments::get_java_home();
709 const char file_sep = os::file_separator()[0];
710 // 10 represents the length of "modules" + 2 file separators + \0
711 size_t len = strlen(home) + strlen(module_name) + 10;
712 char *path = NEW_RESOURCE_ARRAY(char, len);
713 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
714
715 struct stat st;
716 if (os::stat(path, &st) == 0) {
717 // Directory found
718 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, false, CHECK);
719
720 // If the path specification is valid, enter it into this module's list.
721 // There is no need to check for duplicate modules in the exploded entry list,
722 // since no two modules with the same name can be defined to the boot loader.
723 // This is checked at module definition time in Modules::define_module.
724 if (new_entry != NULL) {
725 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
726 module_cpl->add_to_list(new_entry);
727 {
728 MutexLocker ml(Module_lock, THREAD);
729 _exploded_entries->push(module_cpl);
730 }
731 log_info(class, load)("path: %s", path);
732 }
733 }
734 }
735
736 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
737 bool throw_exception,
738 bool is_boot_append,
739 bool from_class_path_attr,
740 TRAPS) {
741 JavaThread* thread = JavaThread::current();
742 ClassPathEntry* new_entry = NULL;
743 if ((st->st_mode & S_IFMT) == S_IFREG) {
744 ResourceMark rm(thread);
745 // Regular file, should be a zip or jimage file
746 // Canonicalized filename
747 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
748 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
749 // This matches the classic VM
750 if (throw_exception) {
751 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
752 } else {
753 return NULL;
754 }
755 }
756 jint error;
757 JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
758 if (jimage != NULL) {
759 new_entry = new ClassPathImageEntry(jimage, canonical_path);
760 } else {
761 char* error_msg = NULL;
762 jzfile* zip;
763 {
764 // enable call to C land
765 ThreadToNativeFromVM ttn(thread);
766 HandleMark hm(thread);
767 zip = (*ZipOpen)(canonical_path, &error_msg);
768 }
769 if (zip != NULL && error_msg == NULL) {
770 new_entry = new ClassPathZipEntry(zip, path, is_boot_append, from_class_path_attr);
771 } else {
772 char *msg;
773 if (error_msg == NULL) {
774 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
775 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
776 } else {
777 int len = (int)(strlen(path) + strlen(error_msg) + 128);
778 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
779 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
780 }
781 // Don't complain about bad jar files added via -Xbootclasspath/a:.
782 if (throw_exception && is_init_completed()) {
783 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
784 } else {
785 return NULL;
786 }
787 }
788 }
789 log_info(class, path)("opened: %s", path);
790 log_info(class, load)("opened: %s", path);
791 } else {
792 // Directory
793 new_entry = new ClassPathDirEntry(path);
794 log_info(class, load)("path: %s", path);
795 }
796 return new_entry;
797 }
798
799
800 // Create a class path zip entry for a given path (return NULL if not found
801 // or zip/JAR file cannot be opened)
802 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
803 // check for a regular file
804 struct stat st;
805 if (os::stat(path, &st) == 0) {
806 if ((st.st_mode & S_IFMT) == S_IFREG) {
807 char canonical_path[JVM_MAXPATHLEN];
808 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
809 char* error_msg = NULL;
810 jzfile* zip;
811 {
812 // enable call to C land
813 JavaThread* thread = JavaThread::current();
814 ThreadToNativeFromVM ttn(thread);
815 HandleMark hm(thread);
816 zip = (*ZipOpen)(canonical_path, &error_msg);
817 }
818 if (zip != NULL && error_msg == NULL) {
819 // create using canonical path
820 return new ClassPathZipEntry(zip, canonical_path, is_boot_append, false);
821 }
822 }
823 }
824 }
825 return NULL;
826 }
827
828 // returns true if entry already on class path
829 bool ClassLoader::contains_append_entry(const char* name) {
830 ClassPathEntry* e = _first_append_entry;
831 while (e != NULL) {
832 // assume zip entries have been canonicalized
833 if (strcmp(name, e->name()) == 0) {
834 return true;
835 }
836 e = e->next();
837 }
838 return false;
839 }
840
841 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
842 if (new_entry != NULL) {
843 if (_last_append_entry == NULL) {
844 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
845 _first_append_entry = _last_append_entry = new_entry;
846 } else {
847 _last_append_entry->set_next(new_entry);
848 _last_append_entry = new_entry;
849 }
850 }
851 }
852
853 // Record the path entries specified in -cp during dump time. The recorded
854 // information will be used at runtime for loading the archived app classes.
855 //
856 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for
857 // loading app classes. Instead, the app class are loaded by the
858 // jdk/internal/loader/ClassLoaders$AppClassLoader instance.
859 void ClassLoader::add_to_app_classpath_entries(const char* path,
860 ClassPathEntry* entry,
861 bool check_for_duplicates) {
862 #if INCLUDE_CDS
863 assert(entry != NULL, "ClassPathEntry should not be NULL");
864 ClassPathEntry* e = _app_classpath_entries;
865 if (check_for_duplicates) {
866 while (e != NULL) {
867 if (strcmp(e->name(), entry->name()) == 0) {
868 // entry already exists
869 return;
870 }
871 e = e->next();
872 }
873 }
874
875 // The entry does not exist, add to the list
876 if (_app_classpath_entries == NULL) {
877 assert(_last_app_classpath_entry == NULL, "Sanity");
878 _app_classpath_entries = _last_app_classpath_entry = entry;
879 } else {
880 _last_app_classpath_entry->set_next(entry);
881 _last_app_classpath_entry = entry;
882 }
883
884 if (entry->is_jar_file()) {
885 ClassLoaderExt::process_jar_manifest(entry, check_for_duplicates);
886 }
887 #endif
888 }
889
890 // Returns true IFF the file/dir exists and the entry was successfully created.
891 bool ClassLoader::update_class_path_entry_list(const char *path,
892 bool check_for_duplicates,
893 bool is_boot_append,
894 bool from_class_path_attr,
895 bool throw_exception) {
896 struct stat st;
897 if (os::stat(path, &st) == 0) {
898 // File or directory found
899 ClassPathEntry* new_entry = NULL;
900 Thread* THREAD = Thread::current();
901 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, from_class_path_attr, CHECK_(false));
902 if (new_entry == NULL) {
903 return false;
904 }
905
906 // Do not reorder the bootclasspath which would break get_system_package().
907 // Add new entry to linked list
908 if (is_boot_append) {
909 add_to_boot_append_entries(new_entry);
910 } else {
911 add_to_app_classpath_entries(path, new_entry, check_for_duplicates);
912 }
913 return true;
914 } else {
915 return false;
916 }
917 }
918
919 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
920 ResourceMark rm;
921 int num_of_entries = module_list->length();
922 for (int i = 0; i < num_of_entries; i++) {
923 ClassPathEntry* e;
924 ModuleClassPathList* mpl = module_list->at(i);
925 tty->print("%s=", mpl->module_name()->as_C_string());
926 e = mpl->module_first_entry();
927 while (e != NULL) {
928 tty->print("%s", e->name());
929 e = e->next();
930 if (e != NULL) {
931 tty->print("%s", os::path_separator());
932 }
933 }
934 tty->print(" ;");
935 }
936 }
937
938 void ClassLoader::print_bootclasspath() {
939 ClassPathEntry* e;
940 tty->print("[bootclasspath= ");
941
942 // Print --patch-module module/path specifications first
943 if (_patch_mod_entries != NULL) {
944 print_module_entry_table(_patch_mod_entries);
945 }
946
947 // [jimage | exploded modules build]
948 if (has_jrt_entry()) {
949 // Print the location of the java runtime image
950 tty->print("%s ;", _jrt_entry->name());
951 } else {
952 // Print exploded module build path specifications
953 if (_exploded_entries != NULL) {
954 print_module_entry_table(_exploded_entries);
955 }
956 }
957
958 // appended entries
959 e = _first_append_entry;
960 while (e != NULL) {
961 tty->print("%s ;", e->name());
962 e = e->next();
963 }
964 tty->print_cr("]");
965 }
966
967 void ClassLoader::load_zip_library() {
968 assert(ZipOpen == NULL, "should not load zip library twice");
969 // First make sure native library is loaded
970 os::native_java_library();
971 // Load zip library
972 char path[JVM_MAXPATHLEN];
973 char ebuf[1024];
974 void* handle = NULL;
975 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
976 handle = os::dll_load(path, ebuf, sizeof ebuf);
977 }
978 if (handle == NULL) {
979 vm_exit_during_initialization("Unable to load ZIP library", path);
980 }
981 // Lookup zip entry points
982 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
983 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
984 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
985 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
986 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
987 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
988 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
989
990 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
991 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
992 GetNextEntry == NULL || Crc32 == NULL) {
993 vm_exit_during_initialization("Corrupted ZIP library", path);
994 }
995
996 if (ZipInflateFully == NULL) {
997 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
998 }
999
1000 // Lookup canonicalize entry in libjava.dll
1001 void *javalib_handle = os::native_java_library();
1002 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1003 // This lookup only works on 1.3. Do not check for non-null here
1004 }
1005
1006 void ClassLoader::load_jimage_library() {
1007 // First make sure native library is loaded
1008 os::native_java_library();
1009 // Load jimage library
1010 char path[JVM_MAXPATHLEN];
1011 char ebuf[1024];
1012 void* handle = NULL;
1013 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1014 handle = os::dll_load(path, ebuf, sizeof ebuf);
1015 }
1016 if (handle == NULL) {
1017 vm_exit_during_initialization("Unable to load jimage library", path);
1018 }
1019
1020 // Lookup jimage entry points
1021 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1022 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1023 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1024 guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1025 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1026 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1027 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1028 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1029 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1030 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1031 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1032 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1033 }
1034
1035 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1036 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1037 }
1038
1039 int ClassLoader::crc32(int crc, const char* buf, int len) {
1040 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1041 return (*Crc32)(crc, (const jbyte*)buf, len);
1042 }
1043
1044 // Function add_package extracts the package from the fully qualified class name
1045 // and checks if the package is in the boot loader's package entry table. If so,
1046 // then it sets the classpath_index in the package entry record.
1047 //
1048 // The classpath_index field is used to find the entry on the boot loader class
1049 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1050 // in an unnamed module. It is also used to indicate (for all packages whose
1051 // classes are loaded by the boot loader) that at least one of the package's
1052 // classes has been loaded.
1053 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1054 assert(fullq_class_name != NULL, "just checking");
1055
1056 // Get package name from fully qualified class name.
1057 ResourceMark rm;
1058 const char *cp = package_from_name(fullq_class_name);
1059 if (cp != NULL) {
1060 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1061 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp);
1062 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1063 if (pkg_entry != NULL) {
1064 assert(classpath_index != -1, "Unexpected classpath_index");
1065 pkg_entry->set_classpath_index(classpath_index);
1066 } else {
1067 return false;
1068 }
1069 }
1070 return true;
1071 }
1072
1073 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1074 // Look up the name in the boot loader's package entry table.
1075 if (name != NULL) {
1076 TempNewSymbol package_sym = SymbolTable::new_symbol(name);
1077 // Look for the package entry in the boot loader's package entry table.
1078 PackageEntry* package =
1079 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1080
1081 // Return NULL if package does not exist or if no classes in that package
1082 // have been loaded.
1083 if (package != NULL && package->has_loaded_class()) {
1084 ModuleEntry* module = package->module();
1085 if (module->location() != NULL) {
1086 ResourceMark rm(THREAD);
1087 Handle ml = java_lang_String::create_from_str(
1088 module->location()->as_C_string(), THREAD);
1089 return ml();
1090 }
1091 // Return entry on boot loader class path.
1092 Handle cph = java_lang_String::create_from_str(
1093 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1094 return cph();
1095 }
1096 }
1097 return NULL;
1098 }
1099
1100 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1101 ResourceMark rm(THREAD);
1102 // List of pointers to PackageEntrys that have loaded classes.
1103 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1104 {
1105 MutexLocker ml(Module_lock, THREAD);
1106
1107 PackageEntryTable* pe_table =
1108 ClassLoaderData::the_null_class_loader_data()->packages();
1109
1110 // Collect the packages that have at least one loaded class.
1111 for (int x = 0; x < pe_table->table_size(); x++) {
1112 for (PackageEntry* package_entry = pe_table->bucket(x);
1113 package_entry != NULL;
1114 package_entry = package_entry->next()) {
1115 if (package_entry->has_loaded_class()) {
1116 loaded_class_pkgs->append(package_entry);
1117 }
1118 }
1119 }
1120 }
1121
1122
1123 // Allocate objArray and fill with java.lang.String
1124 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1125 loaded_class_pkgs->length(), CHECK_NULL);
1126 objArrayHandle result(THREAD, r);
1127 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1128 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1129 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1130 result->obj_at_put(x, str());
1131 }
1132 return result();
1133 }
1134
1135 // caller needs ResourceMark
1136 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1137 int class_name_len) {
1138 assert(class_name != NULL, "invariant");
1139 assert((int)strlen(class_name) == class_name_len, "invariant");
1140
1141 static const char class_suffix[] = ".class";
1142 size_t class_suffix_len = sizeof(class_suffix);
1143
1144 char* const file_name = NEW_RESOURCE_ARRAY(char,
1145 class_name_len +
1146 class_suffix_len); // includes term NULL
1147
1148 strncpy(file_name, class_name, class_name_len);
1149 strncpy(&file_name[class_name_len], class_suffix, class_suffix_len);
1150
1151 return file_name;
1152 }
1153
1154 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1155 const GrowableArray<ModuleClassPathList*>* const module_list) {
1156 int num_of_entries = module_list->length();
1157 const Symbol* class_module_name = mod_entry->name();
1158
1159 // Loop through all the modules in either the patch-module or exploded entries looking for module
1160 for (int i = 0; i < num_of_entries; i++) {
1161 ModuleClassPathList* module_cpl = module_list->at(i);
1162 Symbol* module_cpl_name = module_cpl->module_name();
1163
1164 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1165 // Class' module has been located.
1166 return module_cpl->module_first_entry();
1167 }
1168 }
1169 return NULL;
1170 }
1171
1172
1173 // Search either the patch-module or exploded build entries for class.
1174 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1175 const char* const class_name,
1176 const char* const file_name,
1177 TRAPS) {
1178 ClassFileStream* stream = NULL;
1179
1180 // Find the class' defining module in the boot loader's module entry table
1181 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1182 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1183
1184 // If the module system has not defined java.base yet, then
1185 // classes loaded are assumed to be defined to java.base.
1186 // When java.base is eventually defined by the module system,
1187 // all packages of classes that have been previously loaded
1188 // are verified in ModuleEntryTable::verify_javabase_packages().
1189 if (!Universe::is_module_initialized() &&
1190 !ModuleEntryTable::javabase_defined() &&
1191 mod_entry == NULL) {
1192 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1193 }
1194
1195 // The module must be a named module
1196 ClassPathEntry* e = NULL;
1197 if (mod_entry != NULL && mod_entry->is_named()) {
1198 if (module_list == _exploded_entries) {
1199 // The exploded build entries can be added to at any time so a lock is
1200 // needed when searching them.
1201 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1202 MutexLocker ml(Module_lock, THREAD);
1203 e = find_first_module_cpe(mod_entry, module_list);
1204 } else {
1205 e = find_first_module_cpe(mod_entry, module_list);
1206 }
1207 }
1208
1209 // Try to load the class from the module's ClassPathEntry list.
1210 while (e != NULL) {
1211 stream = e->open_stream(file_name, CHECK_NULL);
1212 // No context.check is required since CDS is not supported
1213 // for an exploded modules build or if --patch-module is specified.
1214 if (NULL != stream) {
1215 return stream;
1216 }
1217 e = e->next();
1218 }
1219 // If the module was located, break out even if the class was not
1220 // located successfully from that module's ClassPathEntry list.
1221 // There will not be another valid entry for that module.
1222 return NULL;
1223 }
1224
1225 // Called by the boot classloader to load classes
1226 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1227 assert(name != NULL, "invariant");
1228 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1229
1230 ResourceMark rm(THREAD);
1231 HandleMark hm(THREAD);
1232
1233 const char* const class_name = name->as_C_string();
1234
1235 EventMark m("loading class %s", class_name);
1236
1237 const char* const file_name = file_name_for_class_name(class_name,
1238 name->utf8_length());
1239 assert(file_name != NULL, "invariant");
1240
1241 // Lookup stream for parsing .class file
1242 ClassFileStream* stream = NULL;
1243 s2 classpath_index = 0;
1244 ClassPathEntry* e = NULL;
1245
1246 // If search_append_only is true, boot loader visibility boundaries are
1247 // set to be _first_append_entry to the end. This includes:
1248 // [-Xbootclasspath/a]; [jvmti appended entries]
1249 //
1250 // If search_append_only is false, boot loader visibility boundaries are
1251 // set to be the --patch-module entries plus the base piece. This includes:
1252 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1253 //
1254
1255 // Load Attempt #1: --patch-module
1256 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1257 // attempt to load the class from those locations specific to the module.
1258 // Specifications to --patch-module can contain a partial number of classes
1259 // that are part of the overall module definition. So if a particular class is not
1260 // found within its module specification, the search should continue to Load Attempt #2.
1261 // Note: The --patch-module entries are never searched if the boot loader's
1262 // visibility boundary is limited to only searching the append entries.
1263 if (_patch_mod_entries != NULL && !search_append_only) {
1264 // At CDS dump time, the --patch-module entries are ignored. That means a
1265 // class is still loaded from the runtime image even if it might
1266 // appear in the _patch_mod_entries. The runtime shared class visibility
1267 // check will determine if a shared class is visible based on the runtime
1268 // environemnt, including the runtime --patch-module setting.
1269 //
1270 // DynamicDumpSharedSpaces requires UseSharedSpaces to be enabled. Since --patch-module
1271 // is not supported with UseSharedSpaces, it is not supported with DynamicDumpSharedSpaces.
1272 assert(!DynamicDumpSharedSpaces, "sanity");
1273 if (!DumpSharedSpaces) {
1274 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1275 }
1276 }
1277
1278 // Load Attempt #2: [jimage | exploded build]
1279 if (!search_append_only && (NULL == stream)) {
1280 if (has_jrt_entry()) {
1281 e = _jrt_entry;
1282 stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1283 } else {
1284 // Exploded build - attempt to locate class in its defining module's location.
1285 assert(_exploded_entries != NULL, "No exploded build entries present");
1286 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1287 }
1288 }
1289
1290 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1291 if (search_append_only && (NULL == stream)) {
1292 // For the boot loader append path search, the starting classpath_index
1293 // for the appended piece is always 1 to account for either the
1294 // _jrt_entry or the _exploded_entries.
1295 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1296 classpath_index = 1;
1297
1298 e = _first_append_entry;
1299 while (e != NULL) {
1300 stream = e->open_stream(file_name, CHECK_NULL);
1301 if (NULL != stream) {
1302 break;
1303 }
1304 e = e->next();
1305 ++classpath_index;
1306 }
1307 }
1308
1309 if (NULL == stream) {
1310 return NULL;
1311 }
1312
1313 stream->set_verify(ClassLoaderExt::should_verify(classpath_index));
1314
1315 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1316 Handle protection_domain;
1317
1318 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1319 name,
1320 loader_data,
1321 protection_domain,
1322 NULL, // unsafe_anonymous_host
1323 NULL, // cp_patches
1324 THREAD);
1325 if (HAS_PENDING_EXCEPTION) {
1326 if (DumpSharedSpaces) {
1327 log_error(cds)("Preload Error: Failed to load %s", class_name);
1328 }
1329 return NULL;
1330 }
1331
1332 if (!add_package(file_name, classpath_index, THREAD)) {
1333 return NULL;
1334 }
1335
1336 return result;
1337 }
1338
1339 #if INCLUDE_CDS
1340 char* ClassLoader::skip_uri_protocol(char* source) {
1341 if (strncmp(source, "file:", 5) == 0) {
1342 // file: protocol path could start with file:/ or file:///
1343 // locate the char after all the forward slashes
1344 int offset = 5;
1345 while (*(source + offset) == '/') {
1346 offset++;
1347 }
1348 source += offset;
1349 // for non-windows platforms, move back one char as the path begins with a '/'
1350 #ifndef _WINDOWS
1351 source -= 1;
1352 #endif
1353 } else if (strncmp(source, "jrt:/", 5) == 0) {
1354 source += 5;
1355 }
1356 return source;
1357 }
1358
1359 // Record the shared classpath index and loader type for classes loaded
1360 // by the builtin loaders at dump time.
1361 void ClassLoader::record_result(InstanceKlass* ik, const ClassFileStream* stream, TRAPS) {
1362 Arguments::assert_is_dumping_archive();
1363 assert(stream != NULL, "sanity");
1364
1365 if (ik->is_unsafe_anonymous()) {
1366 // We do not archive unsafe anonymous classes.
1367 return;
1368 }
1369
1370 oop loader = ik->class_loader();
1371 char* src = (char*)stream->source();
1372 if (src == NULL) {
1373 if (loader == NULL) {
1374 // JFR classes
1375 ik->set_shared_classpath_index(0);
1376 ik->set_class_loader_type(ClassLoader::BOOT_LOADER);
1377 }
1378 return;
1379 }
1380
1381 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1382
1383 ResourceMark rm(THREAD);
1384 int classpath_index = -1;
1385 PackageEntry* pkg_entry = ik->package();
1386
1387 if (FileMapInfo::get_number_of_shared_paths() > 0) {
1388 char* canonical_path_table_entry = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
1389
1390 // save the path from the file: protocol or the module name from the jrt: protocol
1391 // if no protocol prefix is found, path is the same as stream->source()
1392 char* path = skip_uri_protocol(src);
1393 char* canonical_class_src_path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
1394 bool success = get_canonical_path(path, canonical_class_src_path, JVM_MAXPATHLEN);
1395 // The path is from the ClassFileStream. Since a ClassFileStream has been created successfully in functions
1396 // such as ClassLoader::load_class(), its source path must be valid.
1397 assert(success, "must be valid path");
1398 for (int i = 0; i < FileMapInfo::get_number_of_shared_paths(); i++) {
1399 SharedClassPathEntry* ent = FileMapInfo::shared_path(i);
1400 success = get_canonical_path(ent->name(), canonical_path_table_entry, JVM_MAXPATHLEN);
1401 // A shared path has been validated during its creation in ClassLoader::create_class_path_entry(),
1402 // it must be valid here.
1403 assert(success, "must be valid path");
1404 // If the path (from the class stream source) is the same as the shared
1405 // class or module path, then we have a match.
1406 if (strcmp(canonical_path_table_entry, canonical_class_src_path) == 0) {
1407 // NULL pkg_entry and pkg_entry in an unnamed module implies the class
1408 // is from the -cp or boot loader append path which consists of -Xbootclasspath/a
1409 // and jvmti appended entries.
1410 if ((pkg_entry == NULL) || (pkg_entry->in_unnamed_module())) {
1411 // Ensure the index is within the -cp range before assigning
1412 // to the classpath_index.
1413 if (SystemDictionary::is_system_class_loader(loader) &&
1414 (i >= ClassLoaderExt::app_class_paths_start_index()) &&
1415 (i < ClassLoaderExt::app_module_paths_start_index())) {
1416 classpath_index = i;
1417 break;
1418 } else {
1419 if ((i >= 1) &&
1420 (i < ClassLoaderExt::app_class_paths_start_index())) {
1421 // The class must be from boot loader append path which consists of
1422 // -Xbootclasspath/a and jvmti appended entries.
1423 assert(loader == NULL, "sanity");
1424 classpath_index = i;
1425 break;
1426 }
1427 }
1428 } else {
1429 // A class from a named module from the --module-path. Ensure the index is
1430 // within the --module-path range before assigning to the classpath_index.
1431 if ((pkg_entry != NULL) && !(pkg_entry->in_unnamed_module()) && (i > 0)) {
1432 if (i >= ClassLoaderExt::app_module_paths_start_index() &&
1433 i < FileMapInfo::get_number_of_shared_paths()) {
1434 classpath_index = i;
1435 break;
1436 }
1437 }
1438 }
1439 }
1440 // for index 0 and the stream->source() is the modules image or has the jrt: protocol.
1441 // The class must be from the runtime modules image.
1442 if (i == 0 && (stream->from_boot_loader_modules_image() || string_starts_with(src, "jrt:"))) {
1443 classpath_index = i;
1444 break;
1445 }
1446 }
1447
1448 // No path entry found for this class. Must be a shared class loaded by the
1449 // user defined classloader.
1450 if (classpath_index < 0) {
1451 assert(ik->shared_classpath_index() < 0, "Sanity");
1452 ik->set_shared_classpath_index(UNREGISTERED_INDEX);
1453 SystemDictionaryShared::set_shared_class_misc_info(ik, (ClassFileStream*)stream);
1454 return;
1455 }
1456 } else {
1457 // The shared path table is set up after module system initialization.
1458 // The path table contains no entry before that. Any classes loaded prior
1459 // to the setup of the shared path table must be from the modules image.
1460 assert(stream->from_boot_loader_modules_image(), "stream must be loaded by boot loader from modules image");
1461 assert(FileMapInfo::get_number_of_shared_paths() == 0, "shared path table must not have been setup");
1462 classpath_index = 0;
1463 }
1464
1465 const char* const class_name = ik->name()->as_C_string();
1466 const char* const file_name = file_name_for_class_name(class_name,
1467 ik->name()->utf8_length());
1468 assert(file_name != NULL, "invariant");
1469
1470 ClassLoaderExt::record_result(classpath_index, ik, THREAD);
1471 }
1472 #endif // INCLUDE_CDS
1473
1474 // Initialize the class loader's access to methods in libzip. Parse and
1475 // process the boot classpath into a list ClassPathEntry objects. Once
1476 // this list has been created, it must not change order (see class PackageInfo)
1477 // it can be appended to and is by jvmti and the kernel vm.
1478
1479 void ClassLoader::initialize() {
1480 EXCEPTION_MARK;
1481
1482 if (UsePerfData) {
1483 // jvmstat performance counters
1484 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1485 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1486 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1487 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1488 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1489 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1490 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1491 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1492 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1493 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1494
1495 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1496 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1497 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1498 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1499 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1500 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1501 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1502 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1503 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1504 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1505 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1506 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1507 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1508
1509
1510 // The following performance counters are added for measuring the impact
1511 // of the bug fix of 6365597. They are mainly focused on finding out
1512 // the behavior of system & user-defined classloader lock, whether
1513 // ClassLoader.loadClass/findClass is being called synchronized or not.
1514 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1515 "systemLoaderLockContentionRate");
1516 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1517 "nonSystemLoaderLockContentionRate");
1518 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1519 "jvmFindLoadedClassNoLockCalls");
1520 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1521 "jvmDefineClassNoLockCalls");
1522
1523 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1524 "jniDefineClassNoLockCalls");
1525
1526 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1527 "unsafeDefineClassCalls");
1528 }
1529
1530 // lookup zip library entry points
1531 load_zip_library();
1532 // lookup jimage library entry points
1533 load_jimage_library();
1534 setup_bootstrap_search_path();
1535 }
1536
1537 #if INCLUDE_CDS
1538 void ClassLoader::initialize_shared_path() {
1539 if (Arguments::is_dumping_archive()) {
1540 ClassLoaderExt::setup_search_paths();
1541 }
1542 }
1543
1544 void ClassLoader::initialize_module_path(TRAPS) {
1545 if (Arguments::is_dumping_archive()) {
1546 ClassLoaderExt::setup_module_paths(THREAD);
1547 FileMapInfo::allocate_shared_path_table();
1548 }
1549 }
1550 #endif
1551
1552 jlong ClassLoader::classloader_time_ms() {
1553 return UsePerfData ?
1554 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1555 }
1556
1557 jlong ClassLoader::class_init_count() {
1558 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1559 }
1560
1561 jlong ClassLoader::class_init_time_ms() {
1562 return UsePerfData ?
1563 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1564 }
1565
1566 jlong ClassLoader::class_verify_time_ms() {
1567 return UsePerfData ?
1568 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1569 }
1570
1571 jlong ClassLoader::class_link_count() {
1572 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1573 }
1574
1575 jlong ClassLoader::class_link_time_ms() {
1576 return UsePerfData ?
1577 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1578 }
1579
1580 int ClassLoader::compute_Object_vtable() {
1581 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1582 // code to determine actual value from file
1583 // Would be value '11' if finals were in vtable
1584 int JDK_1_2_Object_vtable_size = 5;
1585 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1586 }
1587
1588
1589 void classLoader_init1() {
1590 ClassLoader::initialize();
1591 }
1592
1593 // Complete the ClassPathEntry setup for the boot loader
1594 void ClassLoader::classLoader_init2(TRAPS) {
1595 // Setup the list of module/path pairs for --patch-module processing
1596 // This must be done after the SymbolTable is created in order
1597 // to use fast_compare on module names instead of a string compare.
1598 if (Arguments::get_patch_mod_prefix() != NULL) {
1599 setup_patch_mod_entries();
1600 }
1601
1602 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1603 // to successfully determine if java.base has been patched)
1604 create_javabase();
1605
1606 // Setup the initial java.base/path pair for the exploded build entries.
1607 // As more modules are defined during module system initialization, more
1608 // entries will be added to the exploded build array.
1609 if (!has_jrt_entry()) {
1610 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1611 assert(!DynamicDumpSharedSpaces, "DynamicDumpSharedSpaces not supported with exploded module builds");
1612 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1613 // Set up the boot loader's _exploded_entries list. Note that this gets
1614 // done before loading any classes, by the same thread that will
1615 // subsequently do the first class load. So, no lock is needed for this.
1616 assert(_exploded_entries == NULL, "Should only get initialized once");
1617 _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1618 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
1619 add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1620 }
1621 }
1622
1623
1624 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1625 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1626 if (CanonicalizeEntry != NULL) {
1627 JavaThread* THREAD = JavaThread::current();
1628 JNIEnv* env = THREAD->jni_environment();
1629 ResourceMark rm(THREAD);
1630
1631 // os::native_path writes into orig_copy
1632 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1633 strcpy(orig_copy, orig);
1634 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1635 return false;
1636 }
1637 } else {
1638 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1639 strncpy(out, orig, len);
1640 out[len - 1] = '\0';
1641 }
1642 return true;
1643 }
1644
1645 void ClassLoader::create_javabase() {
1646 Thread* THREAD = Thread::current();
1647
1648 // Create java.base's module entry for the boot
1649 // class loader prior to loading j.l.Ojbect.
1650 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1651
1652 // Get module entry table
1653 ModuleEntryTable* null_cld_modules = null_cld->modules();
1654 if (null_cld_modules == NULL) {
1655 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1656 }
1657
1658 {
1659 MutexLocker ml(Module_lock, THREAD);
1660 ModuleEntry* jb_module = null_cld_modules->locked_create_entry(Handle(),
1661 false, vmSymbols::java_base(), NULL, NULL, null_cld);
1662 if (jb_module == NULL) {
1663 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1664 }
1665 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1666 }
1667 }
1668
1669 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1670 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1671 void PerfClassTraceTime::initialize() {
1672 if (!UsePerfData) return;
1673
1674 if (_eventp != NULL) {
1675 // increment the event counter
1676 _eventp->inc();
1677 }
1678
1679 // stop the current active thread-local timer to measure inclusive time
1680 _prev_active_event = -1;
1681 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1682 if (_timers[i].is_active()) {
1683 assert(_prev_active_event == -1, "should have only one active timer");
1684 _prev_active_event = i;
1685 _timers[i].stop();
1686 }
1687 }
1688
1689 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1690 // start the inclusive timer if not recursively called
1691 _t.start();
1692 }
1693
1694 // start thread-local timer of the given event type
1695 if (!_timers[_event_type].is_active()) {
1696 _timers[_event_type].start();
1697 }
1698 }
1699
1700 PerfClassTraceTime::~PerfClassTraceTime() {
1701 if (!UsePerfData) return;
1702
1703 // stop the thread-local timer as the event completes
1704 // and resume the thread-local timer of the event next on the stack
1705 _timers[_event_type].stop();
1706 jlong selftime = _timers[_event_type].ticks();
1707
1708 if (_prev_active_event >= 0) {
1709 _timers[_prev_active_event].start();
1710 }
1711
1712 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1713
1714 // increment the counters only on the leaf call
1715 _t.stop();
1716 _timep->inc(_t.ticks());
1717 if (_selftimep != NULL) {
1718 _selftimep->inc(selftime);
1719 }
1720 // add all class loading related event selftime to the accumulated time counter
1721 ClassLoader::perf_accumulated_time()->inc(selftime);
1722
1723 // reset the timer
1724 _timers[_event_type].reset();
1725 }