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/compilationPolicy.hpp"
61 #include "runtime/handles.inline.hpp"
62 #include "runtime/init.hpp"
63 #include "runtime/interfaceSupport.inline.hpp"
64 #include "runtime/java.hpp"
65 #include "runtime/javaCalls.hpp"
66 #include "runtime/os.inline.hpp"
67 #include "runtime/threadCritical.hpp"
68 #include "runtime/timer.hpp"
69 #include "runtime/vm_version.hpp"
70 #include "services/management.hpp"
71 #include "services/threadService.hpp"
72 #include "utilities/classpathStream.hpp"
73 #include "utilities/events.hpp"
74 #include "utilities/hashtable.inline.hpp"
75 #include "utilities/macros.hpp"
76
77 // Entry points in zip.dll for loading zip/jar file entries
78
79 typedef void * * (*ZipOpen_t)(const char *name, char **pmsg);
80 typedef void (*ZipClose_t)(jzfile *zip);
81 typedef jzentry* (*FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
82 typedef jboolean (*ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
83 typedef jzentry* (*GetNextEntry_t)(jzfile *zip, jint n);
84 typedef jboolean (*ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
85 typedef jint (*Crc32_t)(jint crc, const jbyte *buf, jint len);
86
87 static ZipOpen_t ZipOpen = NULL;
88 static ZipClose_t ZipClose = NULL;
89 static FindEntry_t FindEntry = NULL;
90 static ReadEntry_t ReadEntry = NULL;
91 static GetNextEntry_t GetNextEntry = NULL;
92 static canonicalize_fn_t CanonicalizeEntry = NULL;
93 static ZipInflateFully_t ZipInflateFully = 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, '/');
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 == '[') {
200 do {
201 class_name_ptr++;
202 } while (*class_name_ptr == '[');
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 == 'L') {
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 if (ZipClose != NULL) {
300 (*ZipClose)(_zip);
301 }
302 FREE_C_HEAP_ARRAY(char, _zip_name);
303 }
304
305 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
306 // enable call to C land
307 JavaThread* thread = JavaThread::current();
308 ThreadToNativeFromVM ttn(thread);
309 // check whether zip archive contains name
310 jint name_len;
311 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
312 if (entry == NULL) return NULL;
313 u1* buffer;
314 char name_buf[128];
315 char* filename;
316 if (name_len < 128) {
317 filename = name_buf;
318 } else {
319 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
320 }
321
322 // read contents into resource array
323 int size = (*filesize) + ((nul_terminate) ? 1 : 0);
324 buffer = NEW_RESOURCE_ARRAY(u1, size);
325 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
326
327 // return result
328 if (nul_terminate) {
329 buffer[*filesize] = 0;
330 }
331 return buffer;
332 }
333
334 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
335 jint filesize;
336 u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
337 if (buffer == NULL) {
338 return NULL;
339 }
340 if (UsePerfData) {
341 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
342 }
343 // Resource allocated
344 return new ClassFileStream(buffer,
345 filesize,
346 _zip_name,
347 ClassFileStream::verify);
348 }
349
350 // invoke function for each entry in the zip file
351 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
352 JavaThread* thread = JavaThread::current();
353 HandleMark handle_mark(thread);
354 ThreadToNativeFromVM ttn(thread);
355 for (int n = 0; ; n++) {
356 jzentry * ze = ((*GetNextEntry)(_zip, n));
357 if (ze == NULL) break;
358 (*f)(ze->name, context);
359 }
360 }
361
362 DEBUG_ONLY(ClassPathImageEntry* ClassPathImageEntry::_singleton = NULL;)
363
364 void ClassPathImageEntry::close_jimage() {
365 if (_jimage != NULL) {
366 (*JImageClose)(_jimage);
367 _jimage = NULL;
368 }
369 }
370
371 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
372 ClassPathEntry(),
373 _jimage(jimage) {
374 guarantee(jimage != NULL, "jimage file is null");
375 guarantee(name != NULL, "jimage file name is null");
376 assert(_singleton == NULL, "VM supports only one jimage");
377 DEBUG_ONLY(_singleton = this);
378 size_t len = strlen(name) + 1;
379 _name = copy_path(name);
380 }
381
382 ClassPathImageEntry::~ClassPathImageEntry() {
383 assert(_singleton == this, "must be");
384 DEBUG_ONLY(_singleton = NULL);
385
386 if (_name != NULL) {
387 FREE_C_HEAP_ARRAY(const char, _name);
388 _name = NULL;
389 }
390 if (_jimage != NULL) {
391 (*JImageClose)(_jimage);
392 _jimage = NULL;
393 }
394 }
395
396 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
397 return open_stream_for_loader(name, ClassLoaderData::the_null_class_loader_data(), THREAD);
398 }
399
400 // For a class in a named module, look it up in the jimage file using this syntax:
401 // /<module-name>/<package-name>/<base-class>
402 //
403 // Assumptions:
404 // 1. There are no unnamed modules in the jimage file.
405 // 2. A package is in at most one module in the jimage file.
406 //
407 ClassFileStream* ClassPathImageEntry::open_stream_for_loader(const char* name, ClassLoaderData* loader_data, TRAPS) {
408 jlong size;
409 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
410
411 if (location == 0) {
412 ResourceMark rm;
413 const char* pkg_name = ClassLoader::package_from_name(name);
414
415 if (pkg_name != NULL) {
416 if (!Universe::is_module_initialized()) {
417 location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
418 } else {
419 PackageEntry* package_entry = ClassLoader::get_package_entry(name, loader_data, CHECK_NULL);
420 if (package_entry != NULL) {
421 ResourceMark rm;
422 // Get the module name
423 ModuleEntry* module = package_entry->module();
424 assert(module != NULL, "Boot classLoader package missing module");
425 assert(module->is_named(), "Boot classLoader package is in unnamed module");
426 const char* module_name = module->name()->as_C_string();
427 if (module_name != NULL) {
428 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
429 }
430 }
431 }
432 }
433 }
434 if (location != 0) {
435 if (UsePerfData) {
436 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
437 }
438 char* data = NEW_RESOURCE_ARRAY(char, size);
439 (*JImageGetResource)(_jimage, location, data, size);
440 // Resource allocated
441 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be");
442 return new ClassFileStream((u1*)data,
443 (int)size,
444 _name,
445 ClassFileStream::verify,
446 true); // from_boot_loader_modules_image
447 }
448
449 return NULL;
450 }
451
452 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
453 const char* module_name,
454 const char* file_name,
455 jlong &size) {
456 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
457 }
458
459 bool ClassPathImageEntry::is_modules_image() const {
460 assert(this == _singleton, "VM supports a single jimage");
461 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be used for jrt entry");
462 return true;
463 }
464
465 #if INCLUDE_CDS
466 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
467 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "only called at dump time");
468 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
469 vm_exit_during_initialization(error, message);
470 }
471 #endif
472
473 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
474 _module_name = module_name;
475 _module_first_entry = NULL;
476 _module_last_entry = NULL;
477 }
478
479 ModuleClassPathList::~ModuleClassPathList() {
480 // Clean out each ClassPathEntry on list
481 ClassPathEntry* e = _module_first_entry;
482 while (e != NULL) {
483 ClassPathEntry* next_entry = e->next();
484 delete e;
485 e = next_entry;
486 }
487 }
488
489 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
490 if (new_entry != NULL) {
491 if (_module_last_entry == NULL) {
492 _module_first_entry = _module_last_entry = new_entry;
493 } else {
494 _module_last_entry->set_next(new_entry);
495 _module_last_entry = new_entry;
496 }
497 }
498 }
499
500 void ClassLoader::trace_class_path(const char* msg, const char* name) {
501 LogTarget(Info, class, path) lt;
502 if (lt.is_enabled()) {
503 LogStream ls(lt);
504 if (msg) {
505 ls.print("%s", msg);
506 }
507 if (name) {
508 if (strlen(name) < 256) {
509 ls.print("%s", name);
510 } else {
511 // For very long paths, we need to print each character separately,
512 // as print_cr() has a length limit
513 while (name[0] != '\0') {
514 ls.print("%c", name[0]);
515 name++;
516 }
517 }
518 }
519 ls.cr();
520 }
521 }
522
523 void ClassLoader::setup_bootstrap_search_path() {
524 const char* sys_class_path = Arguments::get_sysclasspath();
525 assert(sys_class_path != NULL, "System boot class path must not be NULL");
526 if (PrintSharedArchiveAndExit) {
527 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
528 // the same as the bootcp of the shared archive.
529 } else {
530 trace_class_path("bootstrap loader class path=", sys_class_path);
531 }
532 setup_boot_search_path(sys_class_path);
533 }
534
535 #if INCLUDE_CDS
536 void ClassLoader::setup_app_search_path(const char *class_path) {
537 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "Sanity");
538
539 ResourceMark rm;
540 ClasspathStream cp_stream(class_path);
541
542 while (cp_stream.has_next()) {
543 const char* path = cp_stream.get_next();
544 update_class_path_entry_list(path, false, false, false);
545 }
546 }
547
548 void ClassLoader::add_to_module_path_entries(const char* path,
549 ClassPathEntry* entry) {
550 assert(entry != NULL, "ClassPathEntry should not be NULL");
551 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "dump time only");
552
553 // The entry does not exist, add to the list
554 if (_module_path_entries == NULL) {
555 assert(_last_module_path_entry == NULL, "Sanity");
556 _module_path_entries = _last_module_path_entry = entry;
557 } else {
558 _last_module_path_entry->set_next(entry);
559 _last_module_path_entry = entry;
560 }
561 }
562
563 // Add a module path to the _module_path_entries list.
564 void ClassLoader::update_module_path_entry_list(const char *path, TRAPS) {
565 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "dump time only");
566 struct stat st;
567 if (os::stat(path, &st) != 0) {
568 tty->print_cr("os::stat error %d (%s). CDS dump aborted (path was \"%s\").",
569 errno, os::errno_name(errno), path);
570 vm_exit_during_initialization();
571 }
572 // File or directory found
573 ClassPathEntry* new_entry = NULL;
574 new_entry = create_class_path_entry(path, &st, true /* throw_exception */,
575 false /*is_boot_append */, false /* from_class_path_attr */, CHECK);
576 if (new_entry == NULL) {
577 return;
578 }
579
580 add_to_module_path_entries(path, new_entry);
581 return;
582 }
583
584 void ClassLoader::setup_module_search_path(const char* path, TRAPS) {
585 update_module_path_entry_list(path, THREAD);
586 }
587
588 #endif // INCLUDE_CDS
589
590 void ClassLoader::close_jrt_image() {
591 // Not applicable for exploded builds
592 if (!ClassLoader::has_jrt_entry()) return;
593 _jrt_entry->close_jimage();
594 }
595
596 // Construct the array of module/path pairs as specified to --patch-module
597 // for the boot loader to search ahead of the jimage, if the class being
598 // loaded is defined to a module that has been specified to --patch-module.
599 void ClassLoader::setup_patch_mod_entries() {
600 Thread* THREAD = Thread::current();
601 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
602 int num_of_entries = patch_mod_args->length();
603
604 // Set up the boot loader's _patch_mod_entries list
605 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
606
607 for (int i = 0; i < num_of_entries; i++) {
608 const char* module_name = (patch_mod_args->at(i))->module_name();
609 Symbol* const module_sym = SymbolTable::new_symbol(module_name);
610 assert(module_sym != NULL, "Failed to obtain Symbol for module name");
611 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
612
613 char* class_path = (patch_mod_args->at(i))->path_string();
614 ResourceMark rm(THREAD);
615 ClasspathStream cp_stream(class_path);
616
617 while (cp_stream.has_next()) {
618 const char* path = cp_stream.get_next();
619 struct stat st;
620 if (os::stat(path, &st) == 0) {
621 // File or directory found
622 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, false, CHECK);
623 // If the path specification is valid, enter it into this module's list
624 if (new_entry != NULL) {
625 module_cpl->add_to_list(new_entry);
626 }
627 }
628 }
629
630 // Record the module into the list of --patch-module entries only if
631 // valid ClassPathEntrys have been created
632 if (module_cpl->module_first_entry() != NULL) {
633 _patch_mod_entries->push(module_cpl);
634 }
635 }
636 }
637
638 // Determine whether the module has been patched via the command-line
639 // option --patch-module
640 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
641 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
642 int table_len = _patch_mod_entries->length();
643 for (int i = 0; i < table_len; i++) {
644 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
645 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
646 return true;
647 }
648 }
649 }
650 return false;
651 }
652
653 // Set up the _jrt_entry if present and boot append path
654 void ClassLoader::setup_boot_search_path(const char *class_path) {
655 EXCEPTION_MARK;
656 ResourceMark rm(THREAD);
657 ClasspathStream cp_stream(class_path);
658 bool set_base_piece = true;
659
660 #if INCLUDE_CDS
661 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
662 if (!Arguments::has_jimage()) {
663 vm_exit_during_initialization("CDS is not supported in exploded JDK build", NULL);
664 }
665 }
666 #endif
667
668 while (cp_stream.has_next()) {
669 const char* path = cp_stream.get_next();
670
671 if (set_base_piece) {
672 // The first time through the bootstrap_search setup, it must be determined
673 // what the base or core piece of the boot loader search is. Either a java runtime
674 // image is present or this is an exploded module build situation.
675 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
676 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
677 struct stat st;
678 if (os::stat(path, &st) == 0) {
679 // Directory found
680 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, false, CHECK);
681
682 // Check for a jimage
683 if (Arguments::has_jimage()) {
684 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
685 _jrt_entry = new_entry;
686 assert(new_entry != NULL && new_entry->is_modules_image(), "No java runtime image present");
687 assert(_jrt_entry->jimage() != NULL, "No java runtime image");
688 }
689 } else {
690 // If path does not exist, exit
691 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
692 }
693 set_base_piece = false;
694 } else {
695 // Every entry on the system boot class path after the initial base piece,
696 // which is set by os::set_boot_path(), is considered an appended entry.
697 update_class_path_entry_list(path, false, true, false);
698 }
699 }
700 }
701
702 // During an exploded modules build, each module defined to the boot loader
703 // will be added to the ClassLoader::_exploded_entries array.
704 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
705 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
706 assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
707
708 // Find the module's symbol
709 ResourceMark rm(THREAD);
710 const char *module_name = module_sym->as_C_string();
711 const char *home = Arguments::get_java_home();
712 const char file_sep = os::file_separator()[0];
713 // 10 represents the length of "modules" + 2 file separators + \0
714 size_t len = strlen(home) + strlen(module_name) + 10;
715 char *path = NEW_RESOURCE_ARRAY(char, len);
716 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
717
718 struct stat st;
719 if (os::stat(path, &st) == 0) {
720 // Directory found
721 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, false, CHECK);
722
723 // If the path specification is valid, enter it into this module's list.
724 // There is no need to check for duplicate modules in the exploded entry list,
725 // since no two modules with the same name can be defined to the boot loader.
726 // This is checked at module definition time in Modules::define_module.
727 if (new_entry != NULL) {
728 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
729 module_cpl->add_to_list(new_entry);
730 {
731 MutexLocker ml(Module_lock, THREAD);
732 _exploded_entries->push(module_cpl);
733 }
734 log_info(class, load)("path: %s", path);
735 }
736 }
737 }
738
739 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
740 bool throw_exception,
741 bool is_boot_append,
742 bool from_class_path_attr,
743 TRAPS) {
744 JavaThread* thread = JavaThread::current();
745 ClassPathEntry* new_entry = NULL;
746 if ((st->st_mode & S_IFMT) == S_IFREG) {
747 ResourceMark rm(thread);
748 // Regular file, should be a zip or jimage file
749 // Canonicalized filename
750 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
751 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
752 // This matches the classic VM
753 if (throw_exception) {
754 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
755 } else {
756 return NULL;
757 }
758 }
759 jint error;
760 JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
761 if (jimage != NULL) {
762 new_entry = new ClassPathImageEntry(jimage, canonical_path);
763 } else {
764 char* error_msg = NULL;
765 jzfile* zip;
766 {
767 // enable call to C land
768 ThreadToNativeFromVM ttn(thread);
769 HandleMark hm(thread);
770 zip = (*ZipOpen)(canonical_path, &error_msg);
771 }
772 if (zip != NULL && error_msg == NULL) {
773 new_entry = new ClassPathZipEntry(zip, path, is_boot_append, from_class_path_attr);
774 } else {
775 char *msg;
776 if (error_msg == NULL) {
777 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
778 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
779 } else {
780 int len = (int)(strlen(path) + strlen(error_msg) + 128);
781 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
782 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
783 }
784 // Don't complain about bad jar files added via -Xbootclasspath/a:.
785 if (throw_exception && is_init_completed()) {
786 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
787 } else {
788 return NULL;
789 }
790 }
791 }
792 log_info(class, path)("opened: %s", path);
793 log_info(class, load)("opened: %s", path);
794 } else {
795 // Directory
796 new_entry = new ClassPathDirEntry(path);
797 log_info(class, load)("path: %s", path);
798 }
799 return new_entry;
800 }
801
802
803 // Create a class path zip entry for a given path (return NULL if not found
804 // or zip/JAR file cannot be opened)
805 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
806 // check for a regular file
807 struct stat st;
808 if (os::stat(path, &st) == 0) {
809 if ((st.st_mode & S_IFMT) == S_IFREG) {
810 char canonical_path[JVM_MAXPATHLEN];
811 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
812 char* error_msg = NULL;
813 jzfile* zip;
814 {
815 // enable call to C land
816 JavaThread* thread = JavaThread::current();
817 ThreadToNativeFromVM ttn(thread);
818 HandleMark hm(thread);
819 zip = (*ZipOpen)(canonical_path, &error_msg);
820 }
821 if (zip != NULL && error_msg == NULL) {
822 // create using canonical path
823 return new ClassPathZipEntry(zip, canonical_path, is_boot_append, false);
824 }
825 }
826 }
827 }
828 return NULL;
829 }
830
831 // returns true if entry already on class path
832 bool ClassLoader::contains_append_entry(const char* name) {
833 ClassPathEntry* e = _first_append_entry;
834 while (e != NULL) {
835 // assume zip entries have been canonicalized
836 if (strcmp(name, e->name()) == 0) {
837 return true;
838 }
839 e = e->next();
840 }
841 return false;
842 }
843
844 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
845 if (new_entry != NULL) {
846 if (_last_append_entry == NULL) {
847 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
848 _first_append_entry = _last_append_entry = new_entry;
849 } else {
850 _last_append_entry->set_next(new_entry);
851 _last_append_entry = new_entry;
852 }
853 }
854 }
855
856 // Record the path entries specified in -cp during dump time. The recorded
857 // information will be used at runtime for loading the archived app classes.
858 //
859 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for
860 // loading app classes. Instead, the app class are loaded by the
861 // jdk/internal/loader/ClassLoaders$AppClassLoader instance.
862 void ClassLoader::add_to_app_classpath_entries(const char* path,
863 ClassPathEntry* entry,
864 bool check_for_duplicates) {
865 #if INCLUDE_CDS
866 assert(entry != NULL, "ClassPathEntry should not be NULL");
867 ClassPathEntry* e = _app_classpath_entries;
868 if (check_for_duplicates) {
869 while (e != NULL) {
870 if (strcmp(e->name(), entry->name()) == 0) {
871 // entry already exists
872 return;
873 }
874 e = e->next();
875 }
876 }
877
878 // The entry does not exist, add to the list
879 if (_app_classpath_entries == NULL) {
880 assert(_last_app_classpath_entry == NULL, "Sanity");
881 _app_classpath_entries = _last_app_classpath_entry = entry;
882 } else {
883 _last_app_classpath_entry->set_next(entry);
884 _last_app_classpath_entry = entry;
885 }
886
887 if (entry->is_jar_file()) {
888 ClassLoaderExt::process_jar_manifest(entry, check_for_duplicates);
889 }
890 #endif
891 }
892
893 // Returns true IFF the file/dir exists and the entry was successfully created.
894 bool ClassLoader::update_class_path_entry_list(const char *path,
895 bool check_for_duplicates,
896 bool is_boot_append,
897 bool from_class_path_attr,
898 bool throw_exception) {
899 struct stat st;
900 if (os::stat(path, &st) == 0) {
901 // File or directory found
902 ClassPathEntry* new_entry = NULL;
903 Thread* THREAD = Thread::current();
904 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, from_class_path_attr, CHECK_(false));
905 if (new_entry == NULL) {
906 return false;
907 }
908
909 // Do not reorder the bootclasspath which would break get_system_package().
910 // Add new entry to linked list
911 if (is_boot_append) {
912 add_to_boot_append_entries(new_entry);
913 } else {
914 add_to_app_classpath_entries(path, new_entry, check_for_duplicates);
915 }
916 return true;
917 } else {
918 return false;
919 }
920 }
921
922 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
923 ResourceMark rm;
924 int num_of_entries = module_list->length();
925 for (int i = 0; i < num_of_entries; i++) {
926 ClassPathEntry* e;
927 ModuleClassPathList* mpl = module_list->at(i);
928 tty->print("%s=", mpl->module_name()->as_C_string());
929 e = mpl->module_first_entry();
930 while (e != NULL) {
931 tty->print("%s", e->name());
932 e = e->next();
933 if (e != NULL) {
934 tty->print("%s", os::path_separator());
935 }
936 }
937 tty->print(" ;");
938 }
939 }
940
941 void ClassLoader::print_bootclasspath() {
942 ClassPathEntry* e;
943 tty->print("[bootclasspath= ");
944
945 // Print --patch-module module/path specifications first
946 if (_patch_mod_entries != NULL) {
947 print_module_entry_table(_patch_mod_entries);
948 }
949
950 // [jimage | exploded modules build]
951 if (has_jrt_entry()) {
952 // Print the location of the java runtime image
953 tty->print("%s ;", _jrt_entry->name());
954 } else {
955 // Print exploded module build path specifications
956 if (_exploded_entries != NULL) {
957 print_module_entry_table(_exploded_entries);
958 }
959 }
960
961 // appended entries
962 e = _first_append_entry;
963 while (e != NULL) {
964 tty->print("%s ;", e->name());
965 e = e->next();
966 }
967 tty->print_cr("]");
968 }
969
970 void ClassLoader::load_zip_library() {
971 assert(ZipOpen == NULL, "should not load zip library twice");
972 // First make sure native library is loaded
973 os::native_java_library();
974 // Load zip library
975 char path[JVM_MAXPATHLEN];
976 char ebuf[1024];
977 void* handle = NULL;
978 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
979 handle = os::dll_load(path, ebuf, sizeof ebuf);
980 }
981 if (handle == NULL) {
982 vm_exit_during_initialization("Unable to load ZIP library", path);
983 }
984 // Lookup zip entry points
985 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
986 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
987 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
988 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
989 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
990 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
991 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
992
993 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
994 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
995 GetNextEntry == NULL || Crc32 == NULL) {
996 vm_exit_during_initialization("Corrupted ZIP library", path);
997 }
998
999 if (ZipInflateFully == NULL) {
1000 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
1001 }
1002
1003 // Lookup canonicalize entry in libjava.dll
1004 void *javalib_handle = os::native_java_library();
1005 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1006 // This lookup only works on 1.3. Do not check for non-null here
1007 }
1008
1009 void ClassLoader::load_jimage_library() {
1010 // First make sure native library is loaded
1011 os::native_java_library();
1012 // Load jimage library
1013 char path[JVM_MAXPATHLEN];
1014 char ebuf[1024];
1015 void* handle = NULL;
1016 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1017 handle = os::dll_load(path, ebuf, sizeof ebuf);
1018 }
1019 if (handle == NULL) {
1020 vm_exit_during_initialization("Unable to load jimage library", path);
1021 }
1022
1023 // Lookup jimage entry points
1024 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1025 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1026 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1027 guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1028 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1029 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1030 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1031 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1032 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1033 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1034 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1035 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1036 }
1037
1038 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1039 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1040 }
1041
1042 int ClassLoader::crc32(int crc, const char* buf, int len) {
1043 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1044 return (*Crc32)(crc, (const jbyte*)buf, len);
1045 }
1046
1047 // Function add_package extracts the package from the fully qualified class name
1048 // and checks if the package is in the boot loader's package entry table. If so,
1049 // then it sets the classpath_index in the package entry record.
1050 //
1051 // The classpath_index field is used to find the entry on the boot loader class
1052 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1053 // in an unnamed module. It is also used to indicate (for all packages whose
1054 // classes are loaded by the boot loader) that at least one of the package's
1055 // classes has been loaded.
1056 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1057 assert(fullq_class_name != NULL, "just checking");
1058
1059 // Get package name from fully qualified class name.
1060 ResourceMark rm;
1061 const char *cp = package_from_name(fullq_class_name);
1062 if (cp != NULL) {
1063 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1064 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp);
1065 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1066 if (pkg_entry != NULL) {
1067 assert(classpath_index != -1, "Unexpected classpath_index");
1068 pkg_entry->set_classpath_index(classpath_index);
1069 } else {
1070 return false;
1071 }
1072 }
1073 return true;
1074 }
1075
1076 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1077 // Look up the name in the boot loader's package entry table.
1078 if (name != NULL) {
1079 TempNewSymbol package_sym = SymbolTable::new_symbol(name);
1080 // Look for the package entry in the boot loader's package entry table.
1081 PackageEntry* package =
1082 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1083
1084 // Return NULL if package does not exist or if no classes in that package
1085 // have been loaded.
1086 if (package != NULL && package->has_loaded_class()) {
1087 ModuleEntry* module = package->module();
1088 if (module->location() != NULL) {
1089 ResourceMark rm(THREAD);
1090 Handle ml = java_lang_String::create_from_str(
1091 module->location()->as_C_string(), THREAD);
1092 return ml();
1093 }
1094 // Return entry on boot loader class path.
1095 Handle cph = java_lang_String::create_from_str(
1096 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1097 return cph();
1098 }
1099 }
1100 return NULL;
1101 }
1102
1103 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1104 ResourceMark rm(THREAD);
1105 // List of pointers to PackageEntrys that have loaded classes.
1106 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1107 {
1108 MutexLocker ml(Module_lock, THREAD);
1109
1110 PackageEntryTable* pe_table =
1111 ClassLoaderData::the_null_class_loader_data()->packages();
1112
1113 // Collect the packages that have at least one loaded class.
1114 for (int x = 0; x < pe_table->table_size(); x++) {
1115 for (PackageEntry* package_entry = pe_table->bucket(x);
1116 package_entry != NULL;
1117 package_entry = package_entry->next()) {
1118 if (package_entry->has_loaded_class()) {
1119 loaded_class_pkgs->append(package_entry);
1120 }
1121 }
1122 }
1123 }
1124
1125
1126 // Allocate objArray and fill with java.lang.String
1127 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1128 loaded_class_pkgs->length(), CHECK_NULL);
1129 objArrayHandle result(THREAD, r);
1130 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1131 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1132 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1133 result->obj_at_put(x, str());
1134 }
1135 return result();
1136 }
1137
1138 // caller needs ResourceMark
1139 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1140 int class_name_len) {
1141 assert(class_name != NULL, "invariant");
1142 assert((int)strlen(class_name) == class_name_len, "invariant");
1143
1144 static const char class_suffix[] = ".class";
1145 size_t class_suffix_len = sizeof(class_suffix);
1146
1147 char* const file_name = NEW_RESOURCE_ARRAY(char,
1148 class_name_len +
1149 class_suffix_len); // includes term NULL
1150
1151 strncpy(file_name, class_name, class_name_len);
1152 strncpy(&file_name[class_name_len], class_suffix, class_suffix_len);
1153
1154 return file_name;
1155 }
1156
1157 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1158 const GrowableArray<ModuleClassPathList*>* const module_list) {
1159 int num_of_entries = module_list->length();
1160 const Symbol* class_module_name = mod_entry->name();
1161
1162 // Loop through all the modules in either the patch-module or exploded entries looking for module
1163 for (int i = 0; i < num_of_entries; i++) {
1164 ModuleClassPathList* module_cpl = module_list->at(i);
1165 Symbol* module_cpl_name = module_cpl->module_name();
1166
1167 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1168 // Class' module has been located.
1169 return module_cpl->module_first_entry();
1170 }
1171 }
1172 return NULL;
1173 }
1174
1175
1176 // Search either the patch-module or exploded build entries for class.
1177 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1178 const char* const class_name,
1179 const char* const file_name,
1180 TRAPS) {
1181 ClassFileStream* stream = NULL;
1182
1183 // Find the class' defining module in the boot loader's module entry table
1184 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1185 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1186
1187 // If the module system has not defined java.base yet, then
1188 // classes loaded are assumed to be defined to java.base.
1189 // When java.base is eventually defined by the module system,
1190 // all packages of classes that have been previously loaded
1191 // are verified in ModuleEntryTable::verify_javabase_packages().
1192 if (!Universe::is_module_initialized() &&
1193 !ModuleEntryTable::javabase_defined() &&
1194 mod_entry == NULL) {
1195 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1196 }
1197
1198 // The module must be a named module
1199 ClassPathEntry* e = NULL;
1200 if (mod_entry != NULL && mod_entry->is_named()) {
1201 if (module_list == _exploded_entries) {
1202 // The exploded build entries can be added to at any time so a lock is
1203 // needed when searching them.
1204 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1205 MutexLocker ml(Module_lock, THREAD);
1206 e = find_first_module_cpe(mod_entry, module_list);
1207 } else {
1208 e = find_first_module_cpe(mod_entry, module_list);
1209 }
1210 }
1211
1212 // Try to load the class from the module's ClassPathEntry list.
1213 while (e != NULL) {
1214 stream = e->open_stream(file_name, CHECK_NULL);
1215 // No context.check is required since CDS is not supported
1216 // for an exploded modules build or if --patch-module is specified.
1217 if (NULL != stream) {
1218 return stream;
1219 }
1220 e = e->next();
1221 }
1222 // If the module was located, break out even if the class was not
1223 // located successfully from that module's ClassPathEntry list.
1224 // There will not be another valid entry for that module.
1225 return NULL;
1226 }
1227
1228 // Called by the boot classloader to load classes
1229 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1230 assert(name != NULL, "invariant");
1231 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1232
1233 ResourceMark rm(THREAD);
1234 HandleMark hm(THREAD);
1235
1236 const char* const class_name = name->as_C_string();
1237
1238 EventMark m("loading class %s", class_name);
1239
1240 const char* const file_name = file_name_for_class_name(class_name,
1241 name->utf8_length());
1242 assert(file_name != NULL, "invariant");
1243
1244 // Lookup stream for parsing .class file
1245 ClassFileStream* stream = NULL;
1246 s2 classpath_index = 0;
1247 ClassPathEntry* e = NULL;
1248
1249 // If search_append_only is true, boot loader visibility boundaries are
1250 // set to be _first_append_entry to the end. This includes:
1251 // [-Xbootclasspath/a]; [jvmti appended entries]
1252 //
1253 // If search_append_only is false, boot loader visibility boundaries are
1254 // set to be the --patch-module entries plus the base piece. This includes:
1255 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1256 //
1257
1258 // Load Attempt #1: --patch-module
1259 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1260 // attempt to load the class from those locations specific to the module.
1261 // Specifications to --patch-module can contain a partial number of classes
1262 // that are part of the overall module definition. So if a particular class is not
1263 // found within its module specification, the search should continue to Load Attempt #2.
1264 // Note: The --patch-module entries are never searched if the boot loader's
1265 // visibility boundary is limited to only searching the append entries.
1266 if (_patch_mod_entries != NULL && !search_append_only) {
1267 // At CDS dump time, the --patch-module entries are ignored. That means a
1268 // class is still loaded from the runtime image even if it might
1269 // appear in the _patch_mod_entries. The runtime shared class visibility
1270 // check will determine if a shared class is visible based on the runtime
1271 // environemnt, including the runtime --patch-module setting.
1272 //
1273 // DynamicDumpSharedSpaces requires UseSharedSpaces to be enabled. Since --patch-module
1274 // is not supported with UseSharedSpaces, it is not supported with DynamicDumpSharedSpaces.
1275 assert(!DynamicDumpSharedSpaces, "sanity");
1276 if (!DumpSharedSpaces) {
1277 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1278 }
1279 }
1280
1281 // Load Attempt #2: [jimage | exploded build]
1282 if (!search_append_only && (NULL == stream)) {
1283 if (has_jrt_entry()) {
1284 e = _jrt_entry;
1285 stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1286 } else {
1287 // Exploded build - attempt to locate class in its defining module's location.
1288 assert(_exploded_entries != NULL, "No exploded build entries present");
1289 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1290 }
1291 }
1292
1293 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1294 if (search_append_only && (NULL == stream)) {
1295 // For the boot loader append path search, the starting classpath_index
1296 // for the appended piece is always 1 to account for either the
1297 // _jrt_entry or the _exploded_entries.
1298 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1299 classpath_index = 1;
1300
1301 e = _first_append_entry;
1302 while (e != NULL) {
1303 stream = e->open_stream(file_name, CHECK_NULL);
1304 if (NULL != stream) {
1305 break;
1306 }
1307 e = e->next();
1308 ++classpath_index;
1309 }
1310 }
1311
1312 if (NULL == stream) {
1313 return NULL;
1314 }
1315
1316 stream->set_verify(ClassLoaderExt::should_verify(classpath_index));
1317
1318 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1319 Handle protection_domain;
1320
1321 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1322 name,
1323 loader_data,
1324 protection_domain,
1325 NULL, // unsafe_anonymous_host
1326 NULL, // cp_patches
1327 THREAD);
1328 if (HAS_PENDING_EXCEPTION) {
1329 if (DumpSharedSpaces) {
1330 tty->print_cr("Preload Error: Failed to load %s", class_name);
1331 }
1332 return NULL;
1333 }
1334
1335 if (!add_package(file_name, classpath_index, THREAD)) {
1336 return NULL;
1337 }
1338
1339 return result;
1340 }
1341
1342 #if INCLUDE_CDS
1343 char* ClassLoader::skip_uri_protocol(char* source) {
1344 if (strncmp(source, "file:", 5) == 0) {
1345 // file: protocol path could start with file:/ or file:///
1346 // locate the char after all the forward slashes
1347 int offset = 5;
1348 while (*(source + offset) == '/') {
1349 offset++;
1350 }
1351 source += offset;
1352 // for non-windows platforms, move back one char as the path begins with a '/'
1353 #ifndef _WINDOWS
1354 source -= 1;
1355 #endif
1356 } else if (strncmp(source, "jrt:/", 5) == 0) {
1357 source += 5;
1358 }
1359 return source;
1360 }
1361
1362 // Record the shared classpath index and loader type for classes loaded
1363 // by the builtin loaders at dump time.
1364 void ClassLoader::record_result(InstanceKlass* ik, const ClassFileStream* stream, TRAPS) {
1365 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "sanity");
1366 assert(stream != NULL, "sanity");
1367
1368 if (ik->is_unsafe_anonymous()) {
1369 // We do not archive unsafe anonymous classes.
1370 return;
1371 }
1372
1373 oop loader = ik->class_loader();
1374 char* src = (char*)stream->source();
1375 if (src == NULL) {
1376 if (loader == NULL) {
1377 // JFR classes
1378 ik->set_shared_classpath_index(0);
1379 ik->set_class_loader_type(ClassLoader::BOOT_LOADER);
1380 }
1381 return;
1382 }
1383
1384 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1385
1386 ResourceMark rm(THREAD);
1387 int classpath_index = -1;
1388 PackageEntry* pkg_entry = ik->package();
1389
1390 if (FileMapInfo::get_number_of_shared_paths() > 0) {
1391 char* canonical_path_table_entry = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
1392
1393 // save the path from the file: protocol or the module name from the jrt: protocol
1394 // if no protocol prefix is found, path is the same as stream->source()
1395 char* path = skip_uri_protocol(src);
1396 char* canonical_class_src_path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
1397 bool success = get_canonical_path(path, canonical_class_src_path, JVM_MAXPATHLEN);
1398 // The path is from the ClassFileStream. Since a ClassFileStream has been created successfully in functions
1399 // such as ClassLoader::load_class(), its source path must be valid.
1400 assert(success, "must be valid path");
1401 for (int i = 0; i < FileMapInfo::get_number_of_shared_paths(); i++) {
1402 SharedClassPathEntry* ent = FileMapInfo::shared_path(i);
1403 success = get_canonical_path(ent->name(), canonical_path_table_entry, JVM_MAXPATHLEN);
1404 // A shared path has been validated during its creation in ClassLoader::create_class_path_entry(),
1405 // it must be valid here.
1406 assert(success, "must be valid path");
1407 // If the path (from the class stream source) is the same as the shared
1408 // class or module path, then we have a match.
1409 if (strcmp(canonical_path_table_entry, canonical_class_src_path) == 0) {
1410 // NULL pkg_entry and pkg_entry in an unnamed module implies the class
1411 // is from the -cp or boot loader append path which consists of -Xbootclasspath/a
1412 // and jvmti appended entries.
1413 if ((pkg_entry == NULL) || (pkg_entry->in_unnamed_module())) {
1414 // Ensure the index is within the -cp range before assigning
1415 // to the classpath_index.
1416 if (SystemDictionary::is_system_class_loader(loader) &&
1417 (i >= ClassLoaderExt::app_class_paths_start_index()) &&
1418 (i < ClassLoaderExt::app_module_paths_start_index())) {
1419 classpath_index = i;
1420 break;
1421 } else {
1422 if ((i >= 1) &&
1423 (i < ClassLoaderExt::app_class_paths_start_index())) {
1424 // The class must be from boot loader append path which consists of
1425 // -Xbootclasspath/a and jvmti appended entries.
1426 assert(loader == NULL, "sanity");
1427 classpath_index = i;
1428 break;
1429 }
1430 }
1431 } else {
1432 // A class from a named module from the --module-path. Ensure the index is
1433 // within the --module-path range before assigning to the classpath_index.
1434 if ((pkg_entry != NULL) && !(pkg_entry->in_unnamed_module()) && (i > 0)) {
1435 if (i >= ClassLoaderExt::app_module_paths_start_index() &&
1436 i < FileMapInfo::get_number_of_shared_paths()) {
1437 classpath_index = i;
1438 break;
1439 }
1440 }
1441 }
1442 }
1443 // for index 0 and the stream->source() is the modules image or has the jrt: protocol.
1444 // The class must be from the runtime modules image.
1445 if (i == 0 && (stream->from_boot_loader_modules_image() || string_starts_with(src, "jrt:"))) {
1446 classpath_index = i;
1447 break;
1448 }
1449 }
1450
1451 // No path entry found for this class. Must be a shared class loaded by the
1452 // user defined classloader.
1453 if (classpath_index < 0) {
1454 assert(ik->shared_classpath_index() < 0, "Sanity");
1455 ik->set_shared_classpath_index(UNREGISTERED_INDEX);
1456 SystemDictionaryShared::set_shared_class_misc_info(ik, (ClassFileStream*)stream);
1457 return;
1458 }
1459 } else {
1460 // The shared path table is set up after module system initialization.
1461 // The path table contains no entry before that. Any classes loaded prior
1462 // to the setup of the shared path table must be from the modules image.
1463 assert(stream->from_boot_loader_modules_image(), "stream must be loaded by boot loader from modules image");
1464 assert(FileMapInfo::get_number_of_shared_paths() == 0, "shared path table must not have been setup");
1465 classpath_index = 0;
1466 }
1467
1468 const char* const class_name = ik->name()->as_C_string();
1469 const char* const file_name = file_name_for_class_name(class_name,
1470 ik->name()->utf8_length());
1471 assert(file_name != NULL, "invariant");
1472
1473 ClassLoaderExt::record_result(classpath_index, ik, THREAD);
1474 }
1475 #endif // INCLUDE_CDS
1476
1477 // Initialize the class loader's access to methods in libzip. Parse and
1478 // process the boot classpath into a list ClassPathEntry objects. Once
1479 // this list has been created, it must not change order (see class PackageInfo)
1480 // it can be appended to and is by jvmti and the kernel vm.
1481
1482 void ClassLoader::initialize() {
1483 EXCEPTION_MARK;
1484
1485 if (UsePerfData) {
1486 // jvmstat performance counters
1487 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1488 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1489 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1490 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1491 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1492 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1493 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1494 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1495 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1496 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1497
1498 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1499 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1500 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1501 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1502 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1503 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1504 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1505 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1506 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1507 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1508 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1509 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1510 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1511
1512
1513 // The following performance counters are added for measuring the impact
1514 // of the bug fix of 6365597. They are mainly focused on finding out
1515 // the behavior of system & user-defined classloader lock, whether
1516 // ClassLoader.loadClass/findClass is being called synchronized or not.
1517 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1518 "systemLoaderLockContentionRate");
1519 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1520 "nonSystemLoaderLockContentionRate");
1521 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1522 "jvmFindLoadedClassNoLockCalls");
1523 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1524 "jvmDefineClassNoLockCalls");
1525
1526 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1527 "jniDefineClassNoLockCalls");
1528
1529 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1530 "unsafeDefineClassCalls");
1531 }
1532
1533 // lookup zip library entry points
1534 load_zip_library();
1535 // lookup jimage library entry points
1536 load_jimage_library();
1537
1538 setup_bootstrap_search_path();
1539 }
1540
1541 #if INCLUDE_CDS
1542 void ClassLoader::initialize_shared_path() {
1543 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
1544 ClassLoaderExt::setup_search_paths();
1545 }
1546 }
1547
1548 void ClassLoader::initialize_module_path(TRAPS) {
1549 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
1550 ClassLoaderExt::setup_module_paths(THREAD);
1551 FileMapInfo::allocate_shared_path_table();
1552 }
1553 }
1554 #endif
1555
1556 jlong ClassLoader::classloader_time_ms() {
1557 return UsePerfData ?
1558 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1559 }
1560
1561 jlong ClassLoader::class_init_count() {
1562 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1563 }
1564
1565 jlong ClassLoader::class_init_time_ms() {
1566 return UsePerfData ?
1567 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1568 }
1569
1570 jlong ClassLoader::class_verify_time_ms() {
1571 return UsePerfData ?
1572 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1573 }
1574
1575 jlong ClassLoader::class_link_count() {
1576 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1577 }
1578
1579 jlong ClassLoader::class_link_time_ms() {
1580 return UsePerfData ?
1581 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1582 }
1583
1584 int ClassLoader::compute_Object_vtable() {
1585 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1586 // code to determine actual value from file
1587 // Would be value '11' if finals were in vtable
1588 int JDK_1_2_Object_vtable_size = 5;
1589 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1590 }
1591
1592
1593 void classLoader_init1() {
1594 ClassLoader::initialize();
1595 }
1596
1597 // Complete the ClassPathEntry setup for the boot loader
1598 void ClassLoader::classLoader_init2(TRAPS) {
1599 // Setup the list of module/path pairs for --patch-module processing
1600 // This must be done after the SymbolTable is created in order
1601 // to use fast_compare on module names instead of a string compare.
1602 if (Arguments::get_patch_mod_prefix() != NULL) {
1603 setup_patch_mod_entries();
1604 }
1605
1606 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1607 // to successfully determine if java.base has been patched)
1608 create_javabase();
1609
1610 // Setup the initial java.base/path pair for the exploded build entries.
1611 // As more modules are defined during module system initialization, more
1612 // entries will be added to the exploded build array.
1613 if (!has_jrt_entry()) {
1614 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1615 assert(!DynamicDumpSharedSpaces, "DynamicDumpSharedSpaces not supported with exploded module builds");
1616 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1617 // Set up the boot loader's _exploded_entries list. Note that this gets
1618 // done before loading any classes, by the same thread that will
1619 // subsequently do the first class load. So, no lock is needed for this.
1620 assert(_exploded_entries == NULL, "Should only get initialized once");
1621 _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1622 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
1623 add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1624 }
1625 }
1626
1627
1628 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1629 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1630 if (CanonicalizeEntry != NULL) {
1631 JavaThread* THREAD = JavaThread::current();
1632 JNIEnv* env = THREAD->jni_environment();
1633 ResourceMark rm(THREAD);
1634
1635 // os::native_path writes into orig_copy
1636 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1637 strcpy(orig_copy, orig);
1638 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1639 return false;
1640 }
1641 } else {
1642 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1643 strncpy(out, orig, len);
1644 out[len - 1] = '\0';
1645 }
1646 return true;
1647 }
1648
1649 void ClassLoader::create_javabase() {
1650 Thread* THREAD = Thread::current();
1651
1652 // Create java.base's module entry for the boot
1653 // class loader prior to loading j.l.Ojbect.
1654 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1655
1656 // Get module entry table
1657 ModuleEntryTable* null_cld_modules = null_cld->modules();
1658 if (null_cld_modules == NULL) {
1659 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1660 }
1661
1662 {
1663 MutexLocker ml(Module_lock, THREAD);
1664 ModuleEntry* jb_module = null_cld_modules->locked_create_entry(Handle(),
1665 false, vmSymbols::java_base(), NULL, NULL, null_cld);
1666 if (jb_module == NULL) {
1667 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1668 }
1669 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1670 }
1671 }
1672
1673 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1674 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1675 void PerfClassTraceTime::initialize() {
1676 if (!UsePerfData) return;
1677
1678 if (_eventp != NULL) {
1679 // increment the event counter
1680 _eventp->inc();
1681 }
1682
1683 // stop the current active thread-local timer to measure inclusive time
1684 _prev_active_event = -1;
1685 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1686 if (_timers[i].is_active()) {
1687 assert(_prev_active_event == -1, "should have only one active timer");
1688 _prev_active_event = i;
1689 _timers[i].stop();
1690 }
1691 }
1692
1693 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1694 // start the inclusive timer if not recursively called
1695 _t.start();
1696 }
1697
1698 // start thread-local timer of the given event type
1699 if (!_timers[_event_type].is_active()) {
1700 _timers[_event_type].start();
1701 }
1702 }
1703
1704 PerfClassTraceTime::~PerfClassTraceTime() {
1705 if (!UsePerfData) return;
1706
1707 // stop the thread-local timer as the event completes
1708 // and resume the thread-local timer of the event next on the stack
1709 _timers[_event_type].stop();
1710 jlong selftime = _timers[_event_type].ticks();
1711
1712 if (_prev_active_event >= 0) {
1713 _timers[_prev_active_event].start();
1714 }
1715
1716 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1717
1718 // increment the counters only on the leaf call
1719 _t.stop();
1720 _timep->inc(_t.ticks());
1721 if (_selftimep != NULL) {
1722 _selftimep->inc(selftime);
1723 }
1724 // add all class loading related event selftime to the accumulated time counter
1725 ClassLoader::perf_accumulated_time()->inc(selftime);
1726
1727 // reset the timer
1728 _timers[_event_type].reset();
1729 }