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/systemDictionary.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "compiler/compileBroker.hpp"
40 #include "interpreter/bytecodeStream.hpp"
41 #include "interpreter/oopMapCache.hpp"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "logging/logTag.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "memory/filemap.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "oops/instanceKlass.hpp"
51 #include "oops/instanceRefKlass.hpp"
52 #include "oops/method.inline.hpp"
53 #include "oops/objArrayOop.inline.hpp"
54 #include "oops/oop.inline.hpp"
55 #include "oops/symbol.hpp"
56 #include "prims/jvm_misc.hpp"
57 #include "runtime/arguments.hpp"
58 #include "runtime/compilationPolicy.hpp"
59 #include "runtime/handles.inline.hpp"
60 #include "runtime/init.hpp"
61 #include "runtime/interfaceSupport.inline.hpp"
62 #include "runtime/java.hpp"
63 #include "runtime/javaCalls.hpp"
64 #include "runtime/os.inline.hpp"
65 #include "runtime/threadCritical.hpp"
66 #include "runtime/timer.hpp"
67 #include "runtime/vm_version.hpp"
68 #include "services/management.hpp"
69 #include "services/threadService.hpp"
70 #include "utilities/events.hpp"
71 #include "utilities/hashtable.inline.hpp"
72 #include "utilities/macros.hpp"
73 #if INCLUDE_CDS
74 #include "classfile/sharedPathsMiscInfo.hpp"
75 #endif
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 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
148 #endif
149
150 // helper routines
151 bool string_starts_with(const char* str, const char* str_to_find) {
152 size_t str_len = strlen(str);
153 size_t str_to_find_len = strlen(str_to_find);
154 if (str_to_find_len > str_len) {
155 return false;
156 }
157 return (strncmp(str, str_to_find, str_to_find_len) == 0);
158 }
159
160 static const char* get_jimage_version_string() {
161 static char version_string[10] = "";
162 if (version_string[0] == '\0') {
163 jio_snprintf(version_string, sizeof(version_string), "%d.%d",
164 VM_Version::vm_major_version(), VM_Version::vm_minor_version());
165 }
166 return (const char*)version_string;
167 }
168
169 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
170 size_t str_len = strlen(str);
171 size_t str_to_find_len = strlen(str_to_find);
172 if (str_to_find_len > str_len) {
173 return false;
174 }
175 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
176 }
177
178 // Used to obtain the package name from a fully qualified class name.
179 // It is the responsibility of the caller to establish a ResourceMark.
180 const char* ClassLoader::package_from_name(const char* const class_name, bool* bad_class_name) {
181 if (class_name == NULL) {
182 if (bad_class_name != NULL) {
183 *bad_class_name = true;
184 }
185 return NULL;
186 }
187
188 if (bad_class_name != NULL) {
189 *bad_class_name = false;
190 }
191
192 const char* const last_slash = strrchr(class_name, '/');
193 if (last_slash == NULL) {
194 // No package name
195 return NULL;
196 }
197
198 char* class_name_ptr = (char*) class_name;
199 // Skip over '['s
200 if (*class_name_ptr == '[') {
201 do {
202 class_name_ptr++;
203 } while (*class_name_ptr == '[');
204
205 // Fully qualified class names should not contain a 'L'.
206 // Set bad_class_name to true to indicate that the package name
207 // could not be obtained due to an error condition.
208 // In this situation, is_same_class_package returns false.
209 if (*class_name_ptr == 'L') {
210 if (bad_class_name != NULL) {
211 *bad_class_name = true;
212 }
213 return NULL;
214 }
215 }
216
217 int length = last_slash - class_name_ptr;
218
219 // A class name could have just the slash character in the name.
220 if (length <= 0) {
221 // No package name
222 if (bad_class_name != NULL) {
223 *bad_class_name = true;
224 }
225 return NULL;
226 }
227
228 // drop name after last slash (including slash)
229 // Ex., "java/lang/String.class" => "java/lang"
230 char* pkg_name = NEW_RESOURCE_ARRAY(char, length + 1);
231 strncpy(pkg_name, class_name_ptr, length);
232 *(pkg_name+length) = '\0';
233
234 return (const char *)pkg_name;
235 }
236
237 // Given a fully qualified class name, find its defining package in the class loader's
238 // package entry table.
239 PackageEntry* ClassLoader::get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS) {
240 ResourceMark rm(THREAD);
241 const char *pkg_name = ClassLoader::package_from_name(class_name);
242 if (pkg_name == NULL) {
243 return NULL;
244 }
245 PackageEntryTable* pkgEntryTable = loader_data->packages();
246 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(pkg_name, CHECK_NULL);
247 return pkgEntryTable->lookup_only(pkg_symbol);
248 }
249
250 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
251 char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
252 strcpy(copy, dir);
253 _dir = copy;
254 }
255
256
257 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
258 // construct full path name
259 assert((_dir != NULL) && (name != NULL), "sanity");
260 size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1;
261 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, path_len);
262 int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name);
263 assert(len == (int)(path_len - 1), "sanity");
264 // check if file exists
265 struct stat st;
266 if (os::stat(path, &st) == 0) {
267 // found file, open it
268 int file_handle = os::open(path, 0, 0);
269 if (file_handle != -1) {
270 // read contents into resource array
271 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
272 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
273 // close file
274 os::close(file_handle);
275 // construct ClassFileStream
276 if (num_read == (size_t)st.st_size) {
277 if (UsePerfData) {
278 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
279 }
280 FREE_RESOURCE_ARRAY(char, path, path_len);
281 // Resource allocated
282 return new ClassFileStream(buffer,
283 st.st_size,
284 _dir,
285 ClassFileStream::verify);
286 }
287 }
288 }
289 FREE_RESOURCE_ARRAY(char, path, path_len);
290 return NULL;
291 }
292
293 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() {
294 _zip = zip;
295 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
296 strcpy(copy, zip_name);
297 _zip_name = copy;
298 }
299
300 ClassPathZipEntry::~ClassPathZipEntry() {
301 if (ZipClose != NULL) {
302 (*ZipClose)(_zip);
303 }
304 FREE_C_HEAP_ARRAY(char, _zip_name);
305 }
306
307 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
308 // enable call to C land
309 JavaThread* thread = JavaThread::current();
310 ThreadToNativeFromVM ttn(thread);
311 // check whether zip archive contains name
312 jint name_len;
313 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
314 if (entry == NULL) return NULL;
315 u1* buffer;
316 char name_buf[128];
317 char* filename;
318 if (name_len < 128) {
319 filename = name_buf;
320 } else {
321 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
322 }
323
324 // read contents into resource array
325 int size = (*filesize) + ((nul_terminate) ? 1 : 0);
326 buffer = NEW_RESOURCE_ARRAY(u1, size);
327 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
328
329 // return result
330 if (nul_terminate) {
331 buffer[*filesize] = 0;
332 }
333 return buffer;
334 }
335
336 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
337 jint filesize;
338 u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
339 if (buffer == NULL) {
340 return NULL;
341 }
342 if (UsePerfData) {
343 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
344 }
345 // Resource allocated
346 return new ClassFileStream(buffer,
347 filesize,
348 _zip_name,
349 ClassFileStream::verify);
350 }
351
352 // invoke function for each entry in the zip file
353 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
354 JavaThread* thread = JavaThread::current();
355 HandleMark handle_mark(thread);
356 ThreadToNativeFromVM ttn(thread);
357 for (int n = 0; ; n++) {
358 jzentry * ze = ((*GetNextEntry)(_zip, n));
359 if (ze == NULL) break;
360 (*f)(ze->name, context);
361 }
362 }
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 size_t len = strlen(name) + 1;
377 _name = NEW_C_HEAP_ARRAY(const char, len, mtClass);
378 strncpy((char *)_name, name, len);
379 }
380
381 ClassPathImageEntry::~ClassPathImageEntry() {
382 if (_name != NULL) {
383 FREE_C_HEAP_ARRAY(const char, _name);
384 _name = NULL;
385 }
386 if (_jimage != NULL) {
387 (*JImageClose)(_jimage);
388 _jimage = NULL;
389 }
390 }
391
392 // For a class in a named module, look it up in the jimage file using this syntax:
393 // /<module-name>/<package-name>/<base-class>
394 //
395 // Assumptions:
396 // 1. There are no unnamed modules in the jimage file.
397 // 2. A package is in at most one module in the jimage file.
398 //
399 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
400 jlong size;
401 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
402
403 if (location == 0) {
404 ResourceMark rm;
405 const char* pkg_name = ClassLoader::package_from_name(name);
406
407 if (pkg_name != NULL) {
408 if (!Universe::is_module_initialized()) {
409 location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
410 #if INCLUDE_CDS
411 // CDS uses the boot class loader to load classes whose packages are in
412 // modules defined for other class loaders. So, for now, get their module
413 // names from the "modules" jimage file.
414 if (DumpSharedSpaces && location == 0) {
415 const char* module_name = (*JImagePackageToModule)(_jimage, pkg_name);
416 if (module_name != NULL) {
417 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
418 }
419 }
420 #endif
421
422 } else {
423 PackageEntry* package_entry = ClassLoader::get_package_entry(name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
424 if (package_entry != NULL) {
425 ResourceMark rm;
426 // Get the module name
427 ModuleEntry* module = package_entry->module();
428 assert(module != NULL, "Boot classLoader package missing module");
429 assert(module->is_named(), "Boot classLoader package is in unnamed module");
430 const char* module_name = module->name()->as_C_string();
431 if (module_name != NULL) {
432 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
433 }
434 }
435 }
436 }
437 }
438 if (location != 0) {
439 if (UsePerfData) {
440 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
441 }
442 char* data = NEW_RESOURCE_ARRAY(char, size);
443 (*JImageGetResource)(_jimage, location, data, size);
444 // Resource allocated
445 return new ClassFileStream((u1*)data,
446 (int)size,
447 _name,
448 ClassFileStream::verify,
449 true); // from_modules_image
450 }
451
452 return NULL;
453 }
454
455 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
456 const char* module_name,
457 const char* file_name,
458 jlong &size) {
459 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
460 }
461
462 #if INCLUDE_CDS
463 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
464 assert(DumpSharedSpaces, "only called at dump time");
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 #if INCLUDE_CDS
530 if (DumpSharedSpaces) {
531 _shared_paths_misc_info->add_boot_classpath(sys_class_path);
532 }
533 #endif
534 setup_boot_search_path(sys_class_path);
535 }
536
537 #if INCLUDE_CDS
538 int ClassLoader::get_shared_paths_misc_info_size() {
539 return _shared_paths_misc_info->get_used_bytes();
540 }
541
542 void* ClassLoader::get_shared_paths_misc_info() {
543 return _shared_paths_misc_info->buffer();
544 }
545
546 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
547 SharedPathsMiscInfo* checker = new SharedPathsMiscInfo((char*)buf, size);
548 bool result = checker->check();
549 delete checker;
550 return result;
551 }
552
553 void ClassLoader::setup_app_search_path(const char *class_path) {
554
555 assert(DumpSharedSpaces, "Sanity");
556
557 Thread* THREAD = Thread::current();
558 int len = (int)strlen(class_path);
559 int end = 0;
560
561 // Iterate over class path entries
562 for (int start = 0; start < len; start = end) {
563 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
564 end++;
565 }
566 EXCEPTION_MARK;
567 ResourceMark rm(THREAD);
568 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
569 strncpy(path, &class_path[start], end - start);
570 path[end - start] = '\0';
571
572 update_class_path_entry_list(path, false, false);
573
574 while (class_path[end] == os::path_separator()[0]) {
575 end++;
576 }
577 }
578 }
579
580 void ClassLoader::add_to_module_path_entries(const char* path,
581 ClassPathEntry* entry) {
582 assert(entry != NULL, "ClassPathEntry should not be NULL");
583 assert(DumpSharedSpaces, "dump time only");
584
585 // The entry does not exist, add to the list
586 if (_module_path_entries == NULL) {
587 assert(_last_module_path_entry == NULL, "Sanity");
588 _module_path_entries = _last_module_path_entry = entry;
589 } else {
590 _last_module_path_entry->set_next(entry);
591 _last_module_path_entry = entry;
592 }
593 }
594
595 // Add a module path to the _module_path_entries list.
596 void ClassLoader::update_module_path_entry_list(const char *path, TRAPS) {
597 assert(DumpSharedSpaces, "dump time only");
598 struct stat st;
599 if (os::stat(path, &st) != 0) {
600 tty->print_cr("os::stat error %d (%s). CDS dump aborted (path was \"%s\").",
601 errno, os::errno_name(errno), path);
602 vm_exit_during_initialization();
603 }
604 // File or directory found
605 ClassPathEntry* new_entry = NULL;
606 new_entry = create_class_path_entry(path, &st, true /* throw_exception */,
607 false /*is_boot_append */, CHECK);
608 if (new_entry == NULL) {
609 return;
610 }
611
612 add_to_module_path_entries(path, new_entry);
613 return;
614 }
615
616 void ClassLoader::setup_module_search_path(const char* path, TRAPS) {
617 update_module_path_entry_list(path, THREAD);
618 }
619
620 void ClassLoader::close_jrt_image() {
621 assert(ClassLoader::has_jrt_entry(), "Not applicable for exploded builds");
622 _jrt_entry->close_jimage();
623 }
624
625 #endif // INCLUDE_CDS
626
627 // Construct the array of module/path pairs as specified to --patch-module
628 // for the boot loader to search ahead of the jimage, if the class being
629 // loaded is defined to a module that has been specified to --patch-module.
630 void ClassLoader::setup_patch_mod_entries() {
631 Thread* THREAD = Thread::current();
632 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
633 int num_of_entries = patch_mod_args->length();
634
635
636 // Set up the boot loader's _patch_mod_entries list
637 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
638
639 for (int i = 0; i < num_of_entries; i++) {
640 const char* module_name = (patch_mod_args->at(i))->module_name();
641 Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK);
642 assert(module_sym != NULL, "Failed to obtain Symbol for module name");
643 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
644
645 char* class_path = (patch_mod_args->at(i))->path_string();
646 int len = (int)strlen(class_path);
647 int end = 0;
648 // Iterate over the module's class path entries
649 for (int start = 0; start < len; start = end) {
650 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
651 end++;
652 }
653 EXCEPTION_MARK;
654 ResourceMark rm(THREAD);
655 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
656 strncpy(path, &class_path[start], end - start);
657 path[end - start] = '\0';
658
659 struct stat st;
660 if (os::stat(path, &st) == 0) {
661 // File or directory found
662 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
663 // If the path specification is valid, enter it into this module's list
664 if (new_entry != NULL) {
665 module_cpl->add_to_list(new_entry);
666 }
667 }
668
669 while (class_path[end] == os::path_separator()[0]) {
670 end++;
671 }
672 }
673
674 // Record the module into the list of --patch-module entries only if
675 // valid ClassPathEntrys have been created
676 if (module_cpl->module_first_entry() != NULL) {
677 _patch_mod_entries->push(module_cpl);
678 }
679 }
680 }
681
682 // Determine whether the module has been patched via the command-line
683 // option --patch-module
684 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
685 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
686 int table_len = _patch_mod_entries->length();
687 for (int i = 0; i < table_len; i++) {
688 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
689 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
690 return true;
691 }
692 }
693 }
694 return false;
695 }
696
697 // Set up the _jrt_entry if present and boot append path
698 void ClassLoader::setup_boot_search_path(const char *class_path) {
699 int len = (int)strlen(class_path);
700 int end = 0;
701 bool set_base_piece = true;
702
703 #if INCLUDE_CDS
704 if (DumpSharedSpaces) {
705 if (!Arguments::has_jimage()) {
706 vm_exit_during_initialization("CDS is not supported in exploded JDK build", NULL);
707 }
708 }
709 #endif
710
711 // Iterate over class path entries
712 for (int start = 0; start < len; start = end) {
713 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
714 end++;
715 }
716 EXCEPTION_MARK;
717 ResourceMark rm(THREAD);
718 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
719 strncpy(path, &class_path[start], end - start);
720 path[end - start] = '\0';
721
722 if (set_base_piece) {
723 // The first time through the bootstrap_search setup, it must be determined
724 // what the base or core piece of the boot loader search is. Either a java runtime
725 // image is present or this is an exploded module build situation.
726 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
727 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
728 struct stat st;
729 if (os::stat(path, &st) == 0) {
730 // Directory found
731 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
732
733 // Check for a jimage
734 if (Arguments::has_jimage()) {
735 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
736 assert(new_entry != NULL && new_entry->is_modules_image(), "No java runtime image present");
737 _jrt_entry = new_entry;
738 assert(_jrt_entry->jimage() != NULL, "No java runtime image");
739 }
740 } else {
741 // If path does not exist, exit
742 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
743 }
744 set_base_piece = false;
745 } else {
746 // Every entry on the system boot class path after the initial base piece,
747 // which is set by os::set_boot_path(), is considered an appended entry.
748 update_class_path_entry_list(path, false, true);
749 }
750
751 while (class_path[end] == os::path_separator()[0]) {
752 end++;
753 }
754 }
755 }
756
757 // During an exploded modules build, each module defined to the boot loader
758 // will be added to the ClassLoader::_exploded_entries array.
759 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
760 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
761 assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
762
763 // Find the module's symbol
764 ResourceMark rm(THREAD);
765 const char *module_name = module_sym->as_C_string();
766 const char *home = Arguments::get_java_home();
767 const char file_sep = os::file_separator()[0];
768 // 10 represents the length of "modules" + 2 file separators + \0
769 size_t len = strlen(home) + strlen(module_name) + 10;
770 char *path = NEW_RESOURCE_ARRAY(char, len);
771 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
772
773 struct stat st;
774 if (os::stat(path, &st) == 0) {
775 // Directory found
776 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
777
778 // If the path specification is valid, enter it into this module's list.
779 // There is no need to check for duplicate modules in the exploded entry list,
780 // since no two modules with the same name can be defined to the boot loader.
781 // This is checked at module definition time in Modules::define_module.
782 if (new_entry != NULL) {
783 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
784 module_cpl->add_to_list(new_entry);
785 {
786 MutexLocker ml(Module_lock, THREAD);
787 _exploded_entries->push(module_cpl);
788 }
789 log_info(class, load)("path: %s", path);
790 }
791 }
792 }
793
794 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
795 bool throw_exception,
796 bool is_boot_append, TRAPS) {
797 JavaThread* thread = JavaThread::current();
798 ClassPathEntry* new_entry = NULL;
799 if ((st->st_mode & S_IFMT) == S_IFREG) {
800 ResourceMark rm(thread);
801 // Regular file, should be a zip or jimage file
802 // Canonicalized filename
803 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
804 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
805 // This matches the classic VM
806 if (throw_exception) {
807 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
808 } else {
809 return NULL;
810 }
811 }
812 jint error;
813 JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
814 if (jimage != NULL) {
815 new_entry = new ClassPathImageEntry(jimage, canonical_path);
816 } else {
817 char* error_msg = NULL;
818 jzfile* zip;
819 {
820 // enable call to C land
821 ThreadToNativeFromVM ttn(thread);
822 HandleMark hm(thread);
823 zip = (*ZipOpen)(canonical_path, &error_msg);
824 }
825 if (zip != NULL && error_msg == NULL) {
826 new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
827 } else {
828 char *msg;
829 if (error_msg == NULL) {
830 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
831 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
832 } else {
833 int len = (int)(strlen(path) + strlen(error_msg) + 128);
834 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
835 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
836 }
837 // Don't complain about bad jar files added via -Xbootclasspath/a:.
838 if (throw_exception && is_init_completed()) {
839 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
840 } else {
841 return NULL;
842 }
843 }
844 }
845 log_info(class, path)("opened: %s", path);
846 log_info(class, load)("opened: %s", path);
847 } else {
848 // Directory
849 new_entry = new ClassPathDirEntry(path);
850 log_info(class, load)("path: %s", path);
851 }
852 return new_entry;
853 }
854
855
856 // Create a class path zip entry for a given path (return NULL if not found
857 // or zip/JAR file cannot be opened)
858 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
859 // check for a regular file
860 struct stat st;
861 if (os::stat(path, &st) == 0) {
862 if ((st.st_mode & S_IFMT) == S_IFREG) {
863 char canonical_path[JVM_MAXPATHLEN];
864 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
865 char* error_msg = NULL;
866 jzfile* zip;
867 {
868 // enable call to C land
869 JavaThread* thread = JavaThread::current();
870 ThreadToNativeFromVM ttn(thread);
871 HandleMark hm(thread);
872 zip = (*ZipOpen)(canonical_path, &error_msg);
873 }
874 if (zip != NULL && error_msg == NULL) {
875 // create using canonical path
876 return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
877 }
878 }
879 }
880 }
881 return NULL;
882 }
883
884 // returns true if entry already on class path
885 bool ClassLoader::contains_append_entry(const char* name) {
886 ClassPathEntry* e = _first_append_entry;
887 while (e != NULL) {
888 // assume zip entries have been canonicalized
889 if (strcmp(name, e->name()) == 0) {
890 return true;
891 }
892 e = e->next();
893 }
894 return false;
895 }
896
897 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
898 if (new_entry != NULL) {
899 if (_last_append_entry == NULL) {
900 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
901 _first_append_entry = _last_append_entry = new_entry;
902 } else {
903 _last_append_entry->set_next(new_entry);
904 _last_append_entry = new_entry;
905 }
906 }
907 }
908
909 // Record the path entries specified in -cp during dump time. The recorded
910 // information will be used at runtime for loading the archived app classes.
911 //
912 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for
913 // loading app classes. Instead, the app class are loaded by the
914 // jdk/internal/loader/ClassLoaders$AppClassLoader instance.
915 void ClassLoader::add_to_app_classpath_entries(const char* path,
916 ClassPathEntry* entry,
917 bool check_for_duplicates) {
918 #if INCLUDE_CDS
919 assert(entry != NULL, "ClassPathEntry should not be NULL");
920 ClassPathEntry* e = _app_classpath_entries;
921 if (check_for_duplicates) {
922 while (e != NULL) {
923 if (strcmp(e->name(), entry->name()) == 0) {
924 // entry already exists
925 return;
926 }
927 e = e->next();
928 }
929 }
930
931 // The entry does not exist, add to the list
932 if (_app_classpath_entries == NULL) {
933 assert(_last_app_classpath_entry == NULL, "Sanity");
934 _app_classpath_entries = _last_app_classpath_entry = entry;
935 } else {
936 _last_app_classpath_entry->set_next(entry);
937 _last_app_classpath_entry = entry;
938 }
939
940 if (entry->is_jar_file()) {
941 ClassLoaderExt::process_jar_manifest(entry, check_for_duplicates);
942 }
943 #endif
944 }
945
946 // Returns true IFF the file/dir exists and the entry was successfully created.
947 bool ClassLoader::update_class_path_entry_list(const char *path,
948 bool check_for_duplicates,
949 bool is_boot_append,
950 bool throw_exception) {
951 struct stat st;
952 if (os::stat(path, &st) == 0) {
953 // File or directory found
954 ClassPathEntry* new_entry = NULL;
955 Thread* THREAD = Thread::current();
956 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
957 if (new_entry == NULL) {
958 return false;
959 }
960
961 // Do not reorder the bootclasspath which would break get_system_package().
962 // Add new entry to linked list
963 if (is_boot_append) {
964 add_to_boot_append_entries(new_entry);
965 } else {
966 add_to_app_classpath_entries(path, new_entry, check_for_duplicates);
967 }
968 return true;
969 } else {
970 #if INCLUDE_CDS
971 if (DumpSharedSpaces) {
972 _shared_paths_misc_info->add_nonexist_path(path);
973 }
974 #endif
975 return false;
976 }
977 }
978
979 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
980 ResourceMark rm;
981 int num_of_entries = module_list->length();
982 for (int i = 0; i < num_of_entries; i++) {
983 ClassPathEntry* e;
984 ModuleClassPathList* mpl = module_list->at(i);
985 tty->print("%s=", mpl->module_name()->as_C_string());
986 e = mpl->module_first_entry();
987 while (e != NULL) {
988 tty->print("%s", e->name());
989 e = e->next();
990 if (e != NULL) {
991 tty->print("%s", os::path_separator());
992 }
993 }
994 tty->print(" ;");
995 }
996 }
997
998 void ClassLoader::print_bootclasspath() {
999 ClassPathEntry* e;
1000 tty->print("[bootclasspath= ");
1001
1002 // Print --patch-module module/path specifications first
1003 if (_patch_mod_entries != NULL) {
1004 print_module_entry_table(_patch_mod_entries);
1005 }
1006
1007 // [jimage | exploded modules build]
1008 if (has_jrt_entry()) {
1009 // Print the location of the java runtime image
1010 tty->print("%s ;", _jrt_entry->name());
1011 } else {
1012 // Print exploded module build path specifications
1013 if (_exploded_entries != NULL) {
1014 print_module_entry_table(_exploded_entries);
1015 }
1016 }
1017
1018 // appended entries
1019 e = _first_append_entry;
1020 while (e != NULL) {
1021 tty->print("%s ;", e->name());
1022 e = e->next();
1023 }
1024 tty->print_cr("]");
1025 }
1026
1027 void ClassLoader::load_zip_library() {
1028 assert(ZipOpen == NULL, "should not load zip library twice");
1029 // First make sure native library is loaded
1030 os::native_java_library();
1031 // Load zip library
1032 char path[JVM_MAXPATHLEN];
1033 char ebuf[1024];
1034 void* handle = NULL;
1035 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
1036 handle = os::dll_load(path, ebuf, sizeof ebuf);
1037 }
1038 if (handle == NULL) {
1039 vm_exit_during_initialization("Unable to load ZIP library", path);
1040 }
1041 // Lookup zip entry points
1042 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
1043 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
1044 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
1045 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
1046 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
1047 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
1048 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
1049
1050 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
1051 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
1052 GetNextEntry == NULL || Crc32 == NULL) {
1053 vm_exit_during_initialization("Corrupted ZIP library", path);
1054 }
1055
1056 if (ZipInflateFully == NULL) {
1057 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
1058 }
1059
1060 // Lookup canonicalize entry in libjava.dll
1061 void *javalib_handle = os::native_java_library();
1062 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1063 // This lookup only works on 1.3. Do not check for non-null here
1064 }
1065
1066 void ClassLoader::load_jimage_library() {
1067 // First make sure native library is loaded
1068 os::native_java_library();
1069 // Load jimage library
1070 char path[JVM_MAXPATHLEN];
1071 char ebuf[1024];
1072 void* handle = NULL;
1073 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1074 handle = os::dll_load(path, ebuf, sizeof ebuf);
1075 }
1076 if (handle == NULL) {
1077 vm_exit_during_initialization("Unable to load jimage library", path);
1078 }
1079
1080 // Lookup jimage entry points
1081 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1082 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1083 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1084 guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1085 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1086 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1087 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1088 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1089 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1090 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1091 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1092 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1093 }
1094
1095 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1096 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1097 }
1098
1099 int ClassLoader::crc32(int crc, const char* buf, int len) {
1100 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1101 return (*Crc32)(crc, (const jbyte*)buf, len);
1102 }
1103
1104 // Function add_package extracts the package from the fully qualified class name
1105 // and checks if the package is in the boot loader's package entry table. If so,
1106 // then it sets the classpath_index in the package entry record.
1107 //
1108 // The classpath_index field is used to find the entry on the boot loader class
1109 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1110 // in an unnamed module. It is also used to indicate (for all packages whose
1111 // classes are loaded by the boot loader) that at least one of the package's
1112 // classes has been loaded.
1113 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1114 assert(fullq_class_name != NULL, "just checking");
1115
1116 // Get package name from fully qualified class name.
1117 ResourceMark rm;
1118 const char *cp = package_from_name(fullq_class_name);
1119 if (cp != NULL) {
1120 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1121 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false);
1122 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1123 if (pkg_entry != NULL) {
1124 assert(classpath_index != -1, "Unexpected classpath_index");
1125 pkg_entry->set_classpath_index(classpath_index);
1126 } else {
1127 return false;
1128 }
1129 }
1130 return true;
1131 }
1132
1133 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1134 // Look up the name in the boot loader's package entry table.
1135 if (name != NULL) {
1136 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL);
1137 // Look for the package entry in the boot loader's package entry table.
1138 PackageEntry* package =
1139 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1140
1141 // Return NULL if package does not exist or if no classes in that package
1142 // have been loaded.
1143 if (package != NULL && package->has_loaded_class()) {
1144 ModuleEntry* module = package->module();
1145 if (module->location() != NULL) {
1146 ResourceMark rm(THREAD);
1147 Handle ml = java_lang_String::create_from_str(
1148 module->location()->as_C_string(), THREAD);
1149 return ml();
1150 }
1151 // Return entry on boot loader class path.
1152 Handle cph = java_lang_String::create_from_str(
1153 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1154 return cph();
1155 }
1156 }
1157 return NULL;
1158 }
1159
1160 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1161 ResourceMark rm(THREAD);
1162 // List of pointers to PackageEntrys that have loaded classes.
1163 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1164 {
1165 MutexLocker ml(Module_lock, THREAD);
1166
1167 PackageEntryTable* pe_table =
1168 ClassLoaderData::the_null_class_loader_data()->packages();
1169
1170 // Collect the packages that have at least one loaded class.
1171 for (int x = 0; x < pe_table->table_size(); x++) {
1172 for (PackageEntry* package_entry = pe_table->bucket(x);
1173 package_entry != NULL;
1174 package_entry = package_entry->next()) {
1175 if (package_entry->has_loaded_class()) {
1176 loaded_class_pkgs->append(package_entry);
1177 }
1178 }
1179 }
1180 }
1181
1182
1183 // Allocate objArray and fill with java.lang.String
1184 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1185 loaded_class_pkgs->length(), CHECK_NULL);
1186 objArrayHandle result(THREAD, r);
1187 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1188 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1189 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1190 result->obj_at_put(x, str());
1191 }
1192 return result();
1193 }
1194
1195 // caller needs ResourceMark
1196 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1197 int class_name_len) {
1198 assert(class_name != NULL, "invariant");
1199 assert((int)strlen(class_name) == class_name_len, "invariant");
1200
1201 static const char class_suffix[] = ".class";
1202 size_t class_suffix_len = sizeof(class_suffix);
1203
1204 char* const file_name = NEW_RESOURCE_ARRAY(char,
1205 class_name_len +
1206 class_suffix_len); // includes term NULL
1207
1208 strncpy(file_name, class_name, class_name_len);
1209 strncpy(&file_name[class_name_len], class_suffix, class_suffix_len);
1210
1211 return file_name;
1212 }
1213
1214 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1215 const GrowableArray<ModuleClassPathList*>* const module_list) {
1216 int num_of_entries = module_list->length();
1217 const Symbol* class_module_name = mod_entry->name();
1218
1219 // Loop through all the modules in either the patch-module or exploded entries looking for module
1220 for (int i = 0; i < num_of_entries; i++) {
1221 ModuleClassPathList* module_cpl = module_list->at(i);
1222 Symbol* module_cpl_name = module_cpl->module_name();
1223
1224 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1225 // Class' module has been located.
1226 return module_cpl->module_first_entry();
1227 }
1228 }
1229 return NULL;
1230 }
1231
1232
1233 // Search either the patch-module or exploded build entries for class.
1234 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1235 const char* const class_name,
1236 const char* const file_name,
1237 TRAPS) {
1238 ClassFileStream* stream = NULL;
1239
1240 // Find the class' defining module in the boot loader's module entry table
1241 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1242 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1243
1244 // If the module system has not defined java.base yet, then
1245 // classes loaded are assumed to be defined to java.base.
1246 // When java.base is eventually defined by the module system,
1247 // all packages of classes that have been previously loaded
1248 // are verified in ModuleEntryTable::verify_javabase_packages().
1249 if (!Universe::is_module_initialized() &&
1250 !ModuleEntryTable::javabase_defined() &&
1251 mod_entry == NULL) {
1252 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1253 }
1254
1255 // The module must be a named module
1256 ClassPathEntry* e = NULL;
1257 if (mod_entry != NULL && mod_entry->is_named()) {
1258 if (module_list == _exploded_entries) {
1259 // The exploded build entries can be added to at any time so a lock is
1260 // needed when searching them.
1261 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1262 MutexLocker ml(Module_lock, THREAD);
1263 e = find_first_module_cpe(mod_entry, module_list);
1264 } else {
1265 e = find_first_module_cpe(mod_entry, module_list);
1266 }
1267 }
1268
1269 // Try to load the class from the module's ClassPathEntry list.
1270 while (e != NULL) {
1271 stream = e->open_stream(file_name, CHECK_NULL);
1272 // No context.check is required since CDS is not supported
1273 // for an exploded modules build or if --patch-module is specified.
1274 if (NULL != stream) {
1275 return stream;
1276 }
1277 e = e->next();
1278 }
1279 // If the module was located, break out even if the class was not
1280 // located successfully from that module's ClassPathEntry list.
1281 // There will not be another valid entry for that module.
1282 return NULL;
1283 }
1284
1285 // Called by the boot classloader to load classes
1286 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1287 assert(name != NULL, "invariant");
1288 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1289
1290 ResourceMark rm(THREAD);
1291 HandleMark hm(THREAD);
1292
1293 const char* const class_name = name->as_C_string();
1294
1295 EventMark m("loading class %s", class_name);
1296
1297 const char* const file_name = file_name_for_class_name(class_name,
1298 name->utf8_length());
1299 assert(file_name != NULL, "invariant");
1300
1301 // Lookup stream for parsing .class file
1302 ClassFileStream* stream = NULL;
1303 s2 classpath_index = 0;
1304 ClassPathEntry* e = NULL;
1305
1306 // If search_append_only is true, boot loader visibility boundaries are
1307 // set to be _first_append_entry to the end. This includes:
1308 // [-Xbootclasspath/a]; [jvmti appended entries]
1309 //
1310 // If search_append_only is false, boot loader visibility boundaries are
1311 // set to be the --patch-module entries plus the base piece. This includes:
1312 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1313 //
1314
1315 // Load Attempt #1: --patch-module
1316 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1317 // attempt to load the class from those locations specific to the module.
1318 // Specifications to --patch-module can contain a partial number of classes
1319 // that are part of the overall module definition. So if a particular class is not
1320 // found within its module specification, the search should continue to Load Attempt #2.
1321 // Note: The --patch-module entries are never searched if the boot loader's
1322 // visibility boundary is limited to only searching the append entries.
1323 if (_patch_mod_entries != NULL && !search_append_only) {
1324 // At CDS dump time, the --patch-module entries are ignored. That means a
1325 // class is still loaded from the runtime image even if it might
1326 // appear in the _patch_mod_entries. The runtime shared class visibility
1327 // check will determine if a shared class is visible based on the runtime
1328 // environemnt, including the runtime --patch-module setting.
1329 if (!DumpSharedSpaces) {
1330 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1331 }
1332 }
1333
1334 // Load Attempt #2: [jimage | exploded build]
1335 if (!search_append_only && (NULL == stream)) {
1336 if (has_jrt_entry()) {
1337 e = _jrt_entry;
1338 stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1339 } else {
1340 // Exploded build - attempt to locate class in its defining module's location.
1341 assert(_exploded_entries != NULL, "No exploded build entries present");
1342 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1343 }
1344 }
1345
1346 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1347 if (search_append_only && (NULL == stream)) {
1348 // For the boot loader append path search, the starting classpath_index
1349 // for the appended piece is always 1 to account for either the
1350 // _jrt_entry or the _exploded_entries.
1351 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1352 classpath_index = 1;
1353
1354 e = _first_append_entry;
1355 while (e != NULL) {
1356 stream = e->open_stream(file_name, CHECK_NULL);
1357 if (NULL != stream) {
1358 break;
1359 }
1360 e = e->next();
1361 ++classpath_index;
1362 }
1363 }
1364
1365 if (NULL == stream) {
1366 return NULL;
1367 }
1368
1369 stream->set_verify(ClassLoaderExt::should_verify(classpath_index));
1370
1371 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1372 Handle protection_domain;
1373
1374 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1375 name,
1376 loader_data,
1377 protection_domain,
1378 NULL, // unsafe_anonymous_host
1379 NULL, // cp_patches
1380 THREAD);
1381 if (HAS_PENDING_EXCEPTION) {
1382 if (DumpSharedSpaces) {
1383 tty->print_cr("Preload Error: Failed to load %s", class_name);
1384 }
1385 return NULL;
1386 }
1387
1388 if (!add_package(file_name, classpath_index, THREAD)) {
1389 return NULL;
1390 }
1391
1392 return result;
1393 }
1394
1395 #if INCLUDE_CDS
1396 char* ClassLoader::skip_uri_protocol(char* source) {
1397 if (strncmp(source, "file:", 5) == 0) {
1398 // file: protocol path could start with file:/ or file:///
1399 // locate the char after all the forward slashes
1400 int offset = 5;
1401 while (*(source + offset) == '/') {
1402 offset++;
1403 }
1404 source += offset;
1405 // for non-windows platforms, move back one char as the path begins with a '/'
1406 #ifndef _WINDOWS
1407 source -= 1;
1408 #endif
1409 } else if (strncmp(source, "jrt:/", 5) == 0) {
1410 source += 5;
1411 }
1412 return source;
1413 }
1414
1415 // Record the shared classpath index and loader type for classes loaded
1416 // by the builtin loaders at dump time.
1417 void ClassLoader::record_result(InstanceKlass* ik, const ClassFileStream* stream, TRAPS) {
1418 assert(DumpSharedSpaces, "sanity");
1419 assert(stream != NULL, "sanity");
1420
1421 if (ik->is_unsafe_anonymous()) {
1422 // We do not archive unsafe anonymous classes.
1423 return;
1424 }
1425
1426 oop loader = ik->class_loader();
1427 char* src = (char*)stream->source();
1428 if (src == NULL) {
1429 if (loader == NULL) {
1430 // JFR classes
1431 ik->set_shared_classpath_index(0);
1432 ik->set_class_loader_type(ClassLoader::BOOT_LOADER);
1433 }
1434 return;
1435 }
1436
1437 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1438
1439 ResourceMark rm(THREAD);
1440 int classpath_index = -1;
1441 PackageEntry* pkg_entry = ik->package();
1442
1443 if (FileMapInfo::get_number_of_shared_paths() > 0) {
1444 char* canonical_path_table_entry = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
1445
1446 // save the path from the file: protocol or the module name from the jrt: protocol
1447 // if no protocol prefix is found, path is the same as stream->source()
1448 char* path = skip_uri_protocol(src);
1449 char* canonical_class_src_path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
1450 bool success = get_canonical_path(path, canonical_class_src_path, JVM_MAXPATHLEN);
1451 // The path is from the ClassFileStream. Since a ClassFileStream has been created successfully in functions
1452 // such as ClassLoader::load_class(), its source path must be valid.
1453 assert(success, "must be valid path");
1454 for (int i = 0; i < FileMapInfo::get_number_of_shared_paths(); i++) {
1455 SharedClassPathEntry* ent = FileMapInfo::shared_path(i);
1456 success = get_canonical_path(ent->name(), canonical_path_table_entry, JVM_MAXPATHLEN);
1457 // A shared path has been validated during its creation in ClassLoader::create_class_path_entry(),
1458 // it must be valid here.
1459 assert(success, "must be valid path");
1460 // If the path (from the class stream source) is the same as the shared
1461 // class or module path, then we have a match.
1462 if (strcmp(canonical_path_table_entry, canonical_class_src_path) == 0) {
1463 // NULL pkg_entry and pkg_entry in an unnamed module implies the class
1464 // is from the -cp or boot loader append path which consists of -Xbootclasspath/a
1465 // and jvmti appended entries.
1466 if ((pkg_entry == NULL) || (pkg_entry->in_unnamed_module())) {
1467 // Ensure the index is within the -cp range before assigning
1468 // to the classpath_index.
1469 if (SystemDictionary::is_system_class_loader(loader) &&
1470 (i >= ClassLoaderExt::app_class_paths_start_index()) &&
1471 (i < ClassLoaderExt::app_module_paths_start_index())) {
1472 classpath_index = i;
1473 break;
1474 } else {
1475 if ((i >= 1) &&
1476 (i < ClassLoaderExt::app_class_paths_start_index())) {
1477 // The class must be from boot loader append path which consists of
1478 // -Xbootclasspath/a and jvmti appended entries.
1479 assert(loader == NULL, "sanity");
1480 classpath_index = i;
1481 break;
1482 }
1483 }
1484 } else {
1485 // A class from a named module from the --module-path. Ensure the index is
1486 // within the --module-path range before assigning to the classpath_index.
1487 if ((pkg_entry != NULL) && !(pkg_entry->in_unnamed_module()) && (i > 0)) {
1488 if (i >= ClassLoaderExt::app_module_paths_start_index() &&
1489 i < FileMapInfo::get_number_of_shared_paths()) {
1490 classpath_index = i;
1491 break;
1492 }
1493 }
1494 }
1495 }
1496 // for index 0 and the stream->source() is the modules image or has the jrt: protocol.
1497 // The class must be from the runtime modules image.
1498 if (i == 0 && (stream->from_modules_image() || string_starts_with(src, "jrt:"))) {
1499 classpath_index = i;
1500 break;
1501 }
1502 }
1503
1504 // No path entry found for this class. Must be a shared class loaded by the
1505 // user defined classloader.
1506 if (classpath_index < 0) {
1507 assert(ik->shared_classpath_index() < 0, "Sanity");
1508 return;
1509 }
1510 } else {
1511 // The shared path table is set up after module system initialization.
1512 // The path table contains no entry before that. Any classes loaded prior
1513 // to the setup of the shared path table must be from the modules image.
1514 assert(stream->from_modules_image(), "stream must be from modules image");
1515 assert(FileMapInfo::get_number_of_shared_paths() == 0, "shared path table must not have been setup");
1516 classpath_index = 0;
1517 }
1518
1519 const char* const class_name = ik->name()->as_C_string();
1520 const char* const file_name = file_name_for_class_name(class_name,
1521 ik->name()->utf8_length());
1522 assert(file_name != NULL, "invariant");
1523
1524 ClassLoaderExt::record_result(classpath_index, ik, THREAD);
1525 }
1526 #endif // INCLUDE_CDS
1527
1528 // Initialize the class loader's access to methods in libzip. Parse and
1529 // process the boot classpath into a list ClassPathEntry objects. Once
1530 // this list has been created, it must not change order (see class PackageInfo)
1531 // it can be appended to and is by jvmti and the kernel vm.
1532
1533 void ClassLoader::initialize() {
1534 EXCEPTION_MARK;
1535
1536 if (UsePerfData) {
1537 // jvmstat performance counters
1538 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1539 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1540 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1541 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1542 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1543 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1544 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1545 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1546 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1547 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1548
1549 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1550 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1551 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1552 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1553 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1554 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1555 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1556 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1557 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1558 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1559 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1560 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1561 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1562
1563
1564 // The following performance counters are added for measuring the impact
1565 // of the bug fix of 6365597. They are mainly focused on finding out
1566 // the behavior of system & user-defined classloader lock, whether
1567 // ClassLoader.loadClass/findClass is being called synchronized or not.
1568 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1569 "systemLoaderLockContentionRate");
1570 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1571 "nonSystemLoaderLockContentionRate");
1572 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1573 "jvmFindLoadedClassNoLockCalls");
1574 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1575 "jvmDefineClassNoLockCalls");
1576
1577 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1578 "jniDefineClassNoLockCalls");
1579
1580 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1581 "unsafeDefineClassCalls");
1582 }
1583
1584 // lookup zip library entry points
1585 load_zip_library();
1586 // lookup jimage library entry points
1587 load_jimage_library();
1588 #if INCLUDE_CDS
1589 // initialize search path
1590 if (DumpSharedSpaces) {
1591 _shared_paths_misc_info = new SharedPathsMiscInfo();
1592 }
1593 #endif
1594 setup_bootstrap_search_path();
1595 }
1596
1597 #if INCLUDE_CDS
1598 void ClassLoader::initialize_shared_path() {
1599 if (DumpSharedSpaces) {
1600 ClassLoaderExt::setup_search_paths();
1601 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1602 }
1603 }
1604
1605 void ClassLoader::initialize_module_path(TRAPS) {
1606 if (DumpSharedSpaces) {
1607 ClassLoaderExt::setup_module_paths(THREAD);
1608 FileMapInfo::allocate_shared_path_table();
1609 }
1610 }
1611 #endif
1612
1613 jlong ClassLoader::classloader_time_ms() {
1614 return UsePerfData ?
1615 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1616 }
1617
1618 jlong ClassLoader::class_init_count() {
1619 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1620 }
1621
1622 jlong ClassLoader::class_init_time_ms() {
1623 return UsePerfData ?
1624 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1625 }
1626
1627 jlong ClassLoader::class_verify_time_ms() {
1628 return UsePerfData ?
1629 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1630 }
1631
1632 jlong ClassLoader::class_link_count() {
1633 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1634 }
1635
1636 jlong ClassLoader::class_link_time_ms() {
1637 return UsePerfData ?
1638 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1639 }
1640
1641 int ClassLoader::compute_Object_vtable() {
1642 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1643 // code to determine actual value from file
1644 // Would be value '11' if finals were in vtable
1645 int JDK_1_2_Object_vtable_size = 5;
1646 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1647 }
1648
1649
1650 void classLoader_init1() {
1651 ClassLoader::initialize();
1652 }
1653
1654 // Complete the ClassPathEntry setup for the boot loader
1655 void ClassLoader::classLoader_init2(TRAPS) {
1656 // Setup the list of module/path pairs for --patch-module processing
1657 // This must be done after the SymbolTable is created in order
1658 // to use fast_compare on module names instead of a string compare.
1659 if (Arguments::get_patch_mod_prefix() != NULL) {
1660 setup_patch_mod_entries();
1661 }
1662
1663 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1664 // to successfully determine if java.base has been patched)
1665 create_javabase();
1666
1667 // Setup the initial java.base/path pair for the exploded build entries.
1668 // As more modules are defined during module system initialization, more
1669 // entries will be added to the exploded build array.
1670 if (!has_jrt_entry()) {
1671 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1672 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1673 // Set up the boot loader's _exploded_entries list. Note that this gets
1674 // done before loading any classes, by the same thread that will
1675 // subsequently do the first class load. So, no lock is needed for this.
1676 assert(_exploded_entries == NULL, "Should only get initialized once");
1677 _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1678 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
1679 add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1680 }
1681 }
1682
1683
1684 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1685 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1686 if (CanonicalizeEntry != NULL) {
1687 JavaThread* THREAD = JavaThread::current();
1688 JNIEnv* env = THREAD->jni_environment();
1689 ResourceMark rm(THREAD);
1690
1691 // os::native_path writes into orig_copy
1692 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1693 strcpy(orig_copy, orig);
1694 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1695 return false;
1696 }
1697 } else {
1698 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1699 strncpy(out, orig, len);
1700 out[len - 1] = '\0';
1701 }
1702 return true;
1703 }
1704
1705 void ClassLoader::create_javabase() {
1706 Thread* THREAD = Thread::current();
1707
1708 // Create java.base's module entry for the boot
1709 // class loader prior to loading j.l.Ojbect.
1710 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1711
1712 // Get module entry table
1713 ModuleEntryTable* null_cld_modules = null_cld->modules();
1714 if (null_cld_modules == NULL) {
1715 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1716 }
1717
1718 {
1719 MutexLocker ml(Module_lock, THREAD);
1720 ModuleEntry* jb_module = null_cld_modules->locked_create_entry(Handle(),
1721 false, vmSymbols::java_base(), NULL, NULL, null_cld);
1722 if (jb_module == NULL) {
1723 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1724 }
1725 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1726 }
1727 }
1728
1729 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1730 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1731 void PerfClassTraceTime::initialize() {
1732 if (!UsePerfData) return;
1733
1734 if (_eventp != NULL) {
1735 // increment the event counter
1736 _eventp->inc();
1737 }
1738
1739 // stop the current active thread-local timer to measure inclusive time
1740 _prev_active_event = -1;
1741 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1742 if (_timers[i].is_active()) {
1743 assert(_prev_active_event == -1, "should have only one active timer");
1744 _prev_active_event = i;
1745 _timers[i].stop();
1746 }
1747 }
1748
1749 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1750 // start the inclusive timer if not recursively called
1751 _t.start();
1752 }
1753
1754 // start thread-local timer of the given event type
1755 if (!_timers[_event_type].is_active()) {
1756 _timers[_event_type].start();
1757 }
1758 }
1759
1760 PerfClassTraceTime::~PerfClassTraceTime() {
1761 if (!UsePerfData) return;
1762
1763 // stop the thread-local timer as the event completes
1764 // and resume the thread-local timer of the event next on the stack
1765 _timers[_event_type].stop();
1766 jlong selftime = _timers[_event_type].ticks();
1767
1768 if (_prev_active_event >= 0) {
1769 _timers[_prev_active_event].start();
1770 }
1771
1772 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1773
1774 // increment the counters only on the leaf call
1775 _t.stop();
1776 _timep->inc(_t.ticks());
1777 if (_selftimep != NULL) {
1778 _selftimep->inc(selftime);
1779 }
1780 // add all class loading related event selftime to the accumulated time counter
1781 ClassLoader::perf_accumulated_time()->inc(selftime);
1782
1783 // reset the timer
1784 _timers[_event_type].reset();
1785 }