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' || *class_name_ptr == 'Q') {
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 }
450
451 return NULL;
452 }
453
454 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
455 const char* module_name,
456 const char* file_name,
457 jlong &size) {
458 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
459 }
460
461 bool ClassPathImageEntry::is_modules_image() const {
462 return ClassLoader::is_modules_image(name());
463 }
464
465 #if INCLUDE_CDS
466 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
467 assert(DumpSharedSpaces, "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 #if INCLUDE_CDS
533 if (DumpSharedSpaces) {
534 _shared_paths_misc_info->add_boot_classpath(sys_class_path);
535 }
536 #endif
537 setup_boot_search_path(sys_class_path);
538 }
539
540 #if INCLUDE_CDS
541 int ClassLoader::get_shared_paths_misc_info_size() {
542 return _shared_paths_misc_info->get_used_bytes();
543 }
544
545 void* ClassLoader::get_shared_paths_misc_info() {
546 return _shared_paths_misc_info->buffer();
547 }
548
549 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size) {
550 SharedPathsMiscInfo* checker = new SharedPathsMiscInfo((char*)buf, size);
551 bool result = checker->check();
552 delete checker;
553 return result;
554 }
555
556 void ClassLoader::setup_app_search_path(const char *class_path) {
557
558 assert(DumpSharedSpaces, "Sanity");
559
560 Thread* THREAD = Thread::current();
561 int len = (int)strlen(class_path);
562 int end = 0;
563
564 // Iterate over class path entries
565 for (int start = 0; start < len; start = end) {
566 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
567 end++;
568 }
569 EXCEPTION_MARK;
570 ResourceMark rm(THREAD);
571 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
572 strncpy(path, &class_path[start], end - start);
573 path[end - start] = '\0';
574
575 update_class_path_entry_list(path, false, false);
576
577 while (class_path[end] == os::path_separator()[0]) {
578 end++;
579 }
580 }
581 }
582
583 void ClassLoader::add_to_module_path_entries(const char* path,
584 ClassPathEntry* entry) {
585 assert(entry != NULL, "ClassPathEntry should not be NULL");
586 assert(DumpSharedSpaces, "dump time only");
587
588 // The entry does not exist, add to the list
589 if (_module_path_entries == NULL) {
590 assert(_last_module_path_entry == NULL, "Sanity");
591 _module_path_entries = _last_module_path_entry = entry;
592 } else {
593 _last_module_path_entry->set_next(entry);
594 _last_module_path_entry = entry;
595 }
596 }
597
598 // Add a module path to the _module_path_entries list.
599 void ClassLoader::update_module_path_entry_list(const char *path, TRAPS) {
600 assert(DumpSharedSpaces, "dump time only");
601 struct stat st;
602 if (os::stat(path, &st) != 0) {
603 tty->print_cr("os::stat error %d (%s). CDS dump aborted (path was \"%s\").",
604 errno, os::errno_name(errno), path);
605 vm_exit_during_initialization();
606 }
607 // File or directory found
608 ClassPathEntry* new_entry = NULL;
609 new_entry = create_class_path_entry(path, &st, true /* throw_exception */,
610 false /*is_boot_append */, CHECK);
611 if (new_entry == NULL) {
612 return;
613 }
614
615 add_to_module_path_entries(path, new_entry);
616 return;
617 }
618
619 void ClassLoader::setup_module_search_path(const char* path, TRAPS) {
620 update_module_path_entry_list(path, THREAD);
621 }
622
623 #endif // INCLUDE_CDS
624
625 void ClassLoader::close_jrt_image() {
626 // Not applicable for exploded builds
627 if (!ClassLoader::has_jrt_entry()) return;
628 _jrt_entry->close_jimage();
629 }
630
631 // Construct the array of module/path pairs as specified to --patch-module
632 // for the boot loader to search ahead of the jimage, if the class being
633 // loaded is defined to a module that has been specified to --patch-module.
634 void ClassLoader::setup_patch_mod_entries() {
635 Thread* THREAD = Thread::current();
636 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
637 int num_of_entries = patch_mod_args->length();
638
639
640 // Set up the boot loader's _patch_mod_entries list
641 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
642
643 for (int i = 0; i < num_of_entries; i++) {
644 const char* module_name = (patch_mod_args->at(i))->module_name();
645 Symbol* const module_sym = SymbolTable::lookup(module_name, (int)strlen(module_name), CHECK);
646 assert(module_sym != NULL, "Failed to obtain Symbol for module name");
647 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
648
649 char* class_path = (patch_mod_args->at(i))->path_string();
650 int len = (int)strlen(class_path);
651 int end = 0;
652 // Iterate over the module's class path entries
653 for (int start = 0; start < len; start = end) {
654 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
655 end++;
656 }
657 EXCEPTION_MARK;
658 ResourceMark rm(THREAD);
659 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
660 strncpy(path, &class_path[start], end - start);
661 path[end - start] = '\0';
662
663 struct stat st;
664 if (os::stat(path, &st) == 0) {
665 // File or directory found
666 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
667 // If the path specification is valid, enter it into this module's list
668 if (new_entry != NULL) {
669 module_cpl->add_to_list(new_entry);
670 }
671 }
672
673 while (class_path[end] == os::path_separator()[0]) {
674 end++;
675 }
676 }
677
678 // Record the module into the list of --patch-module entries only if
679 // valid ClassPathEntrys have been created
680 if (module_cpl->module_first_entry() != NULL) {
681 _patch_mod_entries->push(module_cpl);
682 }
683 }
684 }
685
686 // Determine whether the module has been patched via the command-line
687 // option --patch-module
688 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
689 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
690 int table_len = _patch_mod_entries->length();
691 for (int i = 0; i < table_len; i++) {
692 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
693 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
694 return true;
695 }
696 }
697 }
698 return false;
699 }
700
701 // Set up the _jrt_entry if present and boot append path
702 void ClassLoader::setup_boot_search_path(const char *class_path) {
703 int len = (int)strlen(class_path);
704 int end = 0;
705 bool set_base_piece = true;
706
707 #if INCLUDE_CDS
708 if (DumpSharedSpaces) {
709 if (!Arguments::has_jimage()) {
710 vm_exit_during_initialization("CDS is not supported in exploded JDK build", NULL);
711 }
712 }
713 #endif
714
715 // Iterate over class path entries
716 for (int start = 0; start < len; start = end) {
717 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
718 end++;
719 }
720 EXCEPTION_MARK;
721 ResourceMark rm(THREAD);
722 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
723 strncpy(path, &class_path[start], end - start);
724 path[end - start] = '\0';
725
726 if (set_base_piece) {
727 // The first time through the bootstrap_search setup, it must be determined
728 // what the base or core piece of the boot loader search is. Either a java runtime
729 // image is present or this is an exploded module build situation.
730 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
731 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
732 struct stat st;
733 if (os::stat(path, &st) == 0) {
734 // Directory found
735 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
736
737 // Check for a jimage
738 if (Arguments::has_jimage()) {
739 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
740 assert(new_entry != NULL && new_entry->is_modules_image(), "No java runtime image present");
741 _jrt_entry = new_entry;
742 assert(_jrt_entry->jimage() != NULL, "No java runtime image");
743 }
744 } else {
745 // If path does not exist, exit
746 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
747 }
748 set_base_piece = false;
749 } else {
750 // Every entry on the system boot class path after the initial base piece,
751 // which is set by os::set_boot_path(), is considered an appended entry.
752 update_class_path_entry_list(path, false, true);
753 }
754
755 while (class_path[end] == os::path_separator()[0]) {
756 end++;
757 }
758 }
759 }
760
761 // During an exploded modules build, each module defined to the boot loader
762 // will be added to the ClassLoader::_exploded_entries array.
763 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
764 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
765 assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
766
767 // Find the module's symbol
768 ResourceMark rm(THREAD);
769 const char *module_name = module_sym->as_C_string();
770 const char *home = Arguments::get_java_home();
771 const char file_sep = os::file_separator()[0];
772 // 10 represents the length of "modules" + 2 file separators + \0
773 size_t len = strlen(home) + strlen(module_name) + 10;
774 char *path = NEW_RESOURCE_ARRAY(char, len);
775 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
776
777 struct stat st;
778 if (os::stat(path, &st) == 0) {
779 // Directory found
780 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, CHECK);
781
782 // If the path specification is valid, enter it into this module's list.
783 // There is no need to check for duplicate modules in the exploded entry list,
784 // since no two modules with the same name can be defined to the boot loader.
785 // This is checked at module definition time in Modules::define_module.
786 if (new_entry != NULL) {
787 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
788 module_cpl->add_to_list(new_entry);
789 {
790 MutexLocker ml(Module_lock, THREAD);
791 _exploded_entries->push(module_cpl);
792 }
793 log_info(class, load)("path: %s", path);
794 }
795 }
796 }
797
798 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
799 bool throw_exception,
800 bool is_boot_append, TRAPS) {
801 JavaThread* thread = JavaThread::current();
802 ClassPathEntry* new_entry = NULL;
803 if ((st->st_mode & S_IFMT) == S_IFREG) {
804 ResourceMark rm(thread);
805 // Regular file, should be a zip or jimage file
806 // Canonicalized filename
807 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
808 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
809 // This matches the classic VM
810 if (throw_exception) {
811 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
812 } else {
813 return NULL;
814 }
815 }
816 jint error;
817 JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
818 if (jimage != NULL) {
819 new_entry = new ClassPathImageEntry(jimage, canonical_path);
820 } else {
821 char* error_msg = NULL;
822 jzfile* zip;
823 {
824 // enable call to C land
825 ThreadToNativeFromVM ttn(thread);
826 HandleMark hm(thread);
827 zip = (*ZipOpen)(canonical_path, &error_msg);
828 }
829 if (zip != NULL && error_msg == NULL) {
830 new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
831 } else {
832 char *msg;
833 if (error_msg == NULL) {
834 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
835 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
836 } else {
837 int len = (int)(strlen(path) + strlen(error_msg) + 128);
838 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
839 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
840 }
841 // Don't complain about bad jar files added via -Xbootclasspath/a:.
842 if (throw_exception && is_init_completed()) {
843 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
844 } else {
845 return NULL;
846 }
847 }
848 }
849 log_info(class, path)("opened: %s", path);
850 log_info(class, load)("opened: %s", path);
851 } else {
852 // Directory
853 new_entry = new ClassPathDirEntry(path);
854 log_info(class, load)("path: %s", path);
855 }
856 return new_entry;
857 }
858
859
860 // Create a class path zip entry for a given path (return NULL if not found
861 // or zip/JAR file cannot be opened)
862 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
863 // check for a regular file
864 struct stat st;
865 if (os::stat(path, &st) == 0) {
866 if ((st.st_mode & S_IFMT) == S_IFREG) {
867 char canonical_path[JVM_MAXPATHLEN];
868 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
869 char* error_msg = NULL;
870 jzfile* zip;
871 {
872 // enable call to C land
873 JavaThread* thread = JavaThread::current();
874 ThreadToNativeFromVM ttn(thread);
875 HandleMark hm(thread);
876 zip = (*ZipOpen)(canonical_path, &error_msg);
877 }
878 if (zip != NULL && error_msg == NULL) {
879 // create using canonical path
880 return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
881 }
882 }
883 }
884 }
885 return NULL;
886 }
887
888 // returns true if entry already on class path
889 bool ClassLoader::contains_append_entry(const char* name) {
890 ClassPathEntry* e = _first_append_entry;
891 while (e != NULL) {
892 // assume zip entries have been canonicalized
893 if (strcmp(name, e->name()) == 0) {
894 return true;
895 }
896 e = e->next();
897 }
898 return false;
899 }
900
901 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
902 if (new_entry != NULL) {
903 if (_last_append_entry == NULL) {
904 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
905 _first_append_entry = _last_append_entry = new_entry;
906 } else {
907 _last_append_entry->set_next(new_entry);
908 _last_append_entry = new_entry;
909 }
910 }
911 }
912
913 // Record the path entries specified in -cp during dump time. The recorded
914 // information will be used at runtime for loading the archived app classes.
915 //
916 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for
917 // loading app classes. Instead, the app class are loaded by the
918 // jdk/internal/loader/ClassLoaders$AppClassLoader instance.
919 void ClassLoader::add_to_app_classpath_entries(const char* path,
920 ClassPathEntry* entry,
921 bool check_for_duplicates) {
922 #if INCLUDE_CDS
923 assert(entry != NULL, "ClassPathEntry should not be NULL");
924 ClassPathEntry* e = _app_classpath_entries;
925 if (check_for_duplicates) {
926 while (e != NULL) {
927 if (strcmp(e->name(), entry->name()) == 0) {
928 // entry already exists
929 return;
930 }
931 e = e->next();
932 }
933 }
934
935 // The entry does not exist, add to the list
936 if (_app_classpath_entries == NULL) {
937 assert(_last_app_classpath_entry == NULL, "Sanity");
938 _app_classpath_entries = _last_app_classpath_entry = entry;
939 } else {
940 _last_app_classpath_entry->set_next(entry);
941 _last_app_classpath_entry = entry;
942 }
943
944 if (entry->is_jar_file()) {
945 ClassLoaderExt::process_jar_manifest(entry, check_for_duplicates);
946 }
947 #endif
948 }
949
950 // Returns true IFF the file/dir exists and the entry was successfully created.
951 bool ClassLoader::update_class_path_entry_list(const char *path,
952 bool check_for_duplicates,
953 bool is_boot_append,
954 bool throw_exception) {
955 struct stat st;
956 if (os::stat(path, &st) == 0) {
957 // File or directory found
958 ClassPathEntry* new_entry = NULL;
959 Thread* THREAD = Thread::current();
960 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
961 if (new_entry == NULL) {
962 return false;
963 }
964
965 // Do not reorder the bootclasspath which would break get_system_package().
966 // Add new entry to linked list
967 if (is_boot_append) {
968 add_to_boot_append_entries(new_entry);
969 } else {
970 add_to_app_classpath_entries(path, new_entry, check_for_duplicates);
971 }
972 return true;
973 } else {
974 #if INCLUDE_CDS
975 if (DumpSharedSpaces) {
976 _shared_paths_misc_info->add_nonexist_path(path);
977 }
978 #endif
979 return false;
980 }
981 }
982
983 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
984 ResourceMark rm;
985 int num_of_entries = module_list->length();
986 for (int i = 0; i < num_of_entries; i++) {
987 ClassPathEntry* e;
988 ModuleClassPathList* mpl = module_list->at(i);
989 tty->print("%s=", mpl->module_name()->as_C_string());
990 e = mpl->module_first_entry();
991 while (e != NULL) {
992 tty->print("%s", e->name());
993 e = e->next();
994 if (e != NULL) {
995 tty->print("%s", os::path_separator());
996 }
997 }
998 tty->print(" ;");
999 }
1000 }
1001
1002 void ClassLoader::print_bootclasspath() {
1003 ClassPathEntry* e;
1004 tty->print("[bootclasspath= ");
1005
1006 // Print --patch-module module/path specifications first
1007 if (_patch_mod_entries != NULL) {
1008 print_module_entry_table(_patch_mod_entries);
1009 }
1010
1011 // [jimage | exploded modules build]
1012 if (has_jrt_entry()) {
1013 // Print the location of the java runtime image
1014 tty->print("%s ;", _jrt_entry->name());
1015 } else {
1016 // Print exploded module build path specifications
1017 if (_exploded_entries != NULL) {
1018 print_module_entry_table(_exploded_entries);
1019 }
1020 }
1021
1022 // appended entries
1023 e = _first_append_entry;
1024 while (e != NULL) {
1025 tty->print("%s ;", e->name());
1026 e = e->next();
1027 }
1028 tty->print_cr("]");
1029 }
1030
1031 void ClassLoader::load_zip_library() {
1032 assert(ZipOpen == NULL, "should not load zip library twice");
1033 // First make sure native library is loaded
1034 os::native_java_library();
1035 // Load zip library
1036 char path[JVM_MAXPATHLEN];
1037 char ebuf[1024];
1038 void* handle = NULL;
1039 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
1040 handle = os::dll_load(path, ebuf, sizeof ebuf);
1041 }
1042 if (handle == NULL) {
1043 vm_exit_during_initialization("Unable to load ZIP library", path);
1044 }
1045 // Lookup zip entry points
1046 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
1047 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
1048 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
1049 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
1050 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
1051 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
1052 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
1053
1054 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
1055 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
1056 GetNextEntry == NULL || Crc32 == NULL) {
1057 vm_exit_during_initialization("Corrupted ZIP library", path);
1058 }
1059
1060 if (ZipInflateFully == NULL) {
1061 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
1062 }
1063
1064 // Lookup canonicalize entry in libjava.dll
1065 void *javalib_handle = os::native_java_library();
1066 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1067 // This lookup only works on 1.3. Do not check for non-null here
1068 }
1069
1070 void ClassLoader::load_jimage_library() {
1071 // First make sure native library is loaded
1072 os::native_java_library();
1073 // Load jimage library
1074 char path[JVM_MAXPATHLEN];
1075 char ebuf[1024];
1076 void* handle = NULL;
1077 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1078 handle = os::dll_load(path, ebuf, sizeof ebuf);
1079 }
1080 if (handle == NULL) {
1081 vm_exit_during_initialization("Unable to load jimage library", path);
1082 }
1083
1084 // Lookup jimage entry points
1085 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1086 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1087 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1088 guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1089 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1090 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1091 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1092 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1093 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1094 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1095 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1096 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1097 }
1098
1099 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1100 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1101 }
1102
1103 int ClassLoader::crc32(int crc, const char* buf, int len) {
1104 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1105 return (*Crc32)(crc, (const jbyte*)buf, len);
1106 }
1107
1108 // Function add_package extracts the package from the fully qualified class name
1109 // and checks if the package is in the boot loader's package entry table. If so,
1110 // then it sets the classpath_index in the package entry record.
1111 //
1112 // The classpath_index field is used to find the entry on the boot loader class
1113 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1114 // in an unnamed module. It is also used to indicate (for all packages whose
1115 // classes are loaded by the boot loader) that at least one of the package's
1116 // classes has been loaded.
1117 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1118 assert(fullq_class_name != NULL, "just checking");
1119
1120 // Get package name from fully qualified class name.
1121 ResourceMark rm;
1122 const char *cp = package_from_name(fullq_class_name);
1123 if (cp != NULL) {
1124 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1125 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp, CHECK_false);
1126 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1127 if (pkg_entry != NULL) {
1128 assert(classpath_index != -1, "Unexpected classpath_index");
1129 pkg_entry->set_classpath_index(classpath_index);
1130 } else {
1131 return false;
1132 }
1133 }
1134 return true;
1135 }
1136
1137 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1138 // Look up the name in the boot loader's package entry table.
1139 if (name != NULL) {
1140 TempNewSymbol package_sym = SymbolTable::new_symbol(name, (int)strlen(name), CHECK_NULL);
1141 // Look for the package entry in the boot loader's package entry table.
1142 PackageEntry* package =
1143 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1144
1145 // Return NULL if package does not exist or if no classes in that package
1146 // have been loaded.
1147 if (package != NULL && package->has_loaded_class()) {
1148 ModuleEntry* module = package->module();
1149 if (module->location() != NULL) {
1150 ResourceMark rm(THREAD);
1151 Handle ml = java_lang_String::create_from_str(
1152 module->location()->as_C_string(), THREAD);
1153 return ml();
1154 }
1155 // Return entry on boot loader class path.
1156 Handle cph = java_lang_String::create_from_str(
1157 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1158 return cph();
1159 }
1160 }
1161 return NULL;
1162 }
1163
1164 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1165 ResourceMark rm(THREAD);
1166 // List of pointers to PackageEntrys that have loaded classes.
1167 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1168 {
1169 MutexLocker ml(Module_lock, THREAD);
1170
1171 PackageEntryTable* pe_table =
1172 ClassLoaderData::the_null_class_loader_data()->packages();
1173
1174 // Collect the packages that have at least one loaded class.
1175 for (int x = 0; x < pe_table->table_size(); x++) {
1176 for (PackageEntry* package_entry = pe_table->bucket(x);
1177 package_entry != NULL;
1178 package_entry = package_entry->next()) {
1179 if (package_entry->has_loaded_class()) {
1180 loaded_class_pkgs->append(package_entry);
1181 }
1182 }
1183 }
1184 }
1185
1186
1187 // Allocate objArray and fill with java.lang.String
1188 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1189 loaded_class_pkgs->length(), CHECK_NULL);
1190 objArrayHandle result(THREAD, r);
1191 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1192 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1193 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1194 result->obj_at_put(x, str());
1195 }
1196 return result();
1197 }
1198
1199 // caller needs ResourceMark
1200 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1201 int class_name_len) {
1202 assert(class_name != NULL, "invariant");
1203 assert((int)strlen(class_name) == class_name_len, "invariant");
1204
1205 static const char class_suffix[] = ".class";
1206 size_t class_suffix_len = sizeof(class_suffix);
1207
1208 char* const file_name = NEW_RESOURCE_ARRAY(char,
1209 class_name_len +
1210 class_suffix_len); // includes term NULL
1211
1212 strncpy(file_name, class_name, class_name_len);
1213 strncpy(&file_name[class_name_len], class_suffix, class_suffix_len);
1214
1215 return file_name;
1216 }
1217
1218 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1219 const GrowableArray<ModuleClassPathList*>* const module_list) {
1220 int num_of_entries = module_list->length();
1221 const Symbol* class_module_name = mod_entry->name();
1222
1223 // Loop through all the modules in either the patch-module or exploded entries looking for module
1224 for (int i = 0; i < num_of_entries; i++) {
1225 ModuleClassPathList* module_cpl = module_list->at(i);
1226 Symbol* module_cpl_name = module_cpl->module_name();
1227
1228 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1229 // Class' module has been located.
1230 return module_cpl->module_first_entry();
1231 }
1232 }
1233 return NULL;
1234 }
1235
1236
1237 // Search either the patch-module or exploded build entries for class.
1238 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1239 const char* const class_name,
1240 const char* const file_name,
1241 TRAPS) {
1242 ClassFileStream* stream = NULL;
1243
1244 // Find the class' defining module in the boot loader's module entry table
1245 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1246 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1247
1248 // If the module system has not defined java.base yet, then
1249 // classes loaded are assumed to be defined to java.base.
1250 // When java.base is eventually defined by the module system,
1251 // all packages of classes that have been previously loaded
1252 // are verified in ModuleEntryTable::verify_javabase_packages().
1253 if (!Universe::is_module_initialized() &&
1254 !ModuleEntryTable::javabase_defined() &&
1255 mod_entry == NULL) {
1256 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1257 }
1258
1259 // The module must be a named module
1260 ClassPathEntry* e = NULL;
1261 if (mod_entry != NULL && mod_entry->is_named()) {
1262 if (module_list == _exploded_entries) {
1263 // The exploded build entries can be added to at any time so a lock is
1264 // needed when searching them.
1265 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1266 MutexLocker ml(Module_lock, THREAD);
1267 e = find_first_module_cpe(mod_entry, module_list);
1268 } else {
1269 e = find_first_module_cpe(mod_entry, module_list);
1270 }
1271 }
1272
1273 // Try to load the class from the module's ClassPathEntry list.
1274 while (e != NULL) {
1275 stream = e->open_stream(file_name, CHECK_NULL);
1276 // No context.check is required since CDS is not supported
1277 // for an exploded modules build or if --patch-module is specified.
1278 if (NULL != stream) {
1279 return stream;
1280 }
1281 e = e->next();
1282 }
1283 // If the module was located, break out even if the class was not
1284 // located successfully from that module's ClassPathEntry list.
1285 // There will not be another valid entry for that module.
1286 return NULL;
1287 }
1288
1289 // Called by the boot classloader to load classes
1290 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1291 assert(name != NULL, "invariant");
1292 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1293
1294 ResourceMark rm(THREAD);
1295 HandleMark hm(THREAD);
1296
1297 const char* const class_name = name->as_C_string();
1298
1299 EventMark m("loading class %s", class_name);
1300
1301 const char* const file_name = file_name_for_class_name(class_name,
1302 name->utf8_length());
1303 assert(file_name != NULL, "invariant");
1304
1305 // Lookup stream for parsing .class file
1306 ClassFileStream* stream = NULL;
1307 s2 classpath_index = 0;
1308 ClassPathEntry* e = NULL;
1309
1310 // If search_append_only is true, boot loader visibility boundaries are
1311 // set to be _first_append_entry to the end. This includes:
1312 // [-Xbootclasspath/a]; [jvmti appended entries]
1313 //
1314 // If search_append_only is false, boot loader visibility boundaries are
1315 // set to be the --patch-module entries plus the base piece. This includes:
1316 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1317 //
1318
1319 // Load Attempt #1: --patch-module
1320 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1321 // attempt to load the class from those locations specific to the module.
1322 // Specifications to --patch-module can contain a partial number of classes
1323 // that are part of the overall module definition. So if a particular class is not
1324 // found within its module specification, the search should continue to Load Attempt #2.
1325 // Note: The --patch-module entries are never searched if the boot loader's
1326 // visibility boundary is limited to only searching the append entries.
1327 if (_patch_mod_entries != NULL && !search_append_only) {
1328 // At CDS dump time, the --patch-module entries are ignored. That means a
1329 // class is still loaded from the runtime image even if it might
1330 // appear in the _patch_mod_entries. The runtime shared class visibility
1331 // check will determine if a shared class is visible based on the runtime
1332 // environemnt, including the runtime --patch-module setting.
1333 if (!DumpSharedSpaces) {
1334 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1335 }
1336 }
1337
1338 // Load Attempt #2: [jimage | exploded build]
1339 if (!search_append_only && (NULL == stream)) {
1340 if (has_jrt_entry()) {
1341 e = _jrt_entry;
1342 stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1343 } else {
1344 // Exploded build - attempt to locate class in its defining module's location.
1345 assert(_exploded_entries != NULL, "No exploded build entries present");
1346 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1347 }
1348 }
1349
1350 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1351 if (search_append_only && (NULL == stream)) {
1352 // For the boot loader append path search, the starting classpath_index
1353 // for the appended piece is always 1 to account for either the
1354 // _jrt_entry or the _exploded_entries.
1355 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1356 classpath_index = 1;
1357
1358 e = _first_append_entry;
1359 while (e != NULL) {
1360 stream = e->open_stream(file_name, CHECK_NULL);
1361 if (NULL != stream) {
1362 break;
1363 }
1364 e = e->next();
1365 ++classpath_index;
1366 }
1367 }
1368
1369 if (NULL == stream) {
1370 return NULL;
1371 }
1372
1373 stream->set_verify(ClassLoaderExt::should_verify(classpath_index));
1374
1375 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1376 Handle protection_domain;
1377
1378 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1379 name,
1380 loader_data,
1381 protection_domain,
1382 NULL, // unsafe_anonymous_host
1383 NULL, // cp_patches
1384 THREAD);
1385 if (HAS_PENDING_EXCEPTION) {
1386 if (DumpSharedSpaces) {
1387 tty->print_cr("Preload Error: Failed to load %s", class_name);
1388 }
1389 return NULL;
1390 }
1391
1392 if (!add_package(file_name, classpath_index, THREAD)) {
1393 return NULL;
1394 }
1395
1396 return result;
1397 }
1398
1399 #if INCLUDE_CDS
1400 char* ClassLoader::skip_uri_protocol(char* source) {
1401 if (strncmp(source, "file:", 5) == 0) {
1402 // file: protocol path could start with file:/ or file:///
1403 // locate the char after all the forward slashes
1404 int offset = 5;
1405 while (*(source + offset) == '/') {
1406 offset++;
1407 }
1408 source += offset;
1409 // for non-windows platforms, move back one char as the path begins with a '/'
1410 #ifndef _WINDOWS
1411 source -= 1;
1412 #endif
1413 } else if (strncmp(source, "jrt:/", 5) == 0) {
1414 source += 5;
1415 }
1416 return source;
1417 }
1418
1419 // Record the shared classpath index and loader type for classes loaded
1420 // by the builtin loaders at dump time.
1421 void ClassLoader::record_result(InstanceKlass* ik, const ClassFileStream* stream, TRAPS) {
1422 assert(DumpSharedSpaces, "sanity");
1423 assert(stream != NULL, "sanity");
1424
1425 if (ik->is_unsafe_anonymous()) {
1426 // We do not archive unsafe anonymous classes.
1427 return;
1428 }
1429
1430 oop loader = ik->class_loader();
1431 char* src = (char*)stream->source();
1432 if (src == NULL) {
1433 if (loader == NULL) {
1434 // JFR classes
1435 ik->set_shared_classpath_index(0);
1436 ik->set_class_loader_type(ClassLoader::BOOT_LOADER);
1437 }
1438 return;
1439 }
1440
1441 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1442
1443 ResourceMark rm(THREAD);
1444 int classpath_index = -1;
1445 PackageEntry* pkg_entry = ik->package();
1446
1447 if (FileMapInfo::get_number_of_shared_paths() > 0) {
1448 char* canonical_path_table_entry = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
1449
1450 // save the path from the file: protocol or the module name from the jrt: protocol
1451 // if no protocol prefix is found, path is the same as stream->source()
1452 char* path = skip_uri_protocol(src);
1453 char* canonical_class_src_path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
1454 bool success = get_canonical_path(path, canonical_class_src_path, JVM_MAXPATHLEN);
1455 // The path is from the ClassFileStream. Since a ClassFileStream has been created successfully in functions
1456 // such as ClassLoader::load_class(), its source path must be valid.
1457 assert(success, "must be valid path");
1458 for (int i = 0; i < FileMapInfo::get_number_of_shared_paths(); i++) {
1459 SharedClassPathEntry* ent = FileMapInfo::shared_path(i);
1460 success = get_canonical_path(ent->name(), canonical_path_table_entry, JVM_MAXPATHLEN);
1461 // A shared path has been validated during its creation in ClassLoader::create_class_path_entry(),
1462 // it must be valid here.
1463 assert(success, "must be valid path");
1464 // If the path (from the class stream source) is the same as the shared
1465 // class or module path, then we have a match.
1466 if (strcmp(canonical_path_table_entry, canonical_class_src_path) == 0) {
1467 // NULL pkg_entry and pkg_entry in an unnamed module implies the class
1468 // is from the -cp or boot loader append path which consists of -Xbootclasspath/a
1469 // and jvmti appended entries.
1470 if ((pkg_entry == NULL) || (pkg_entry->in_unnamed_module())) {
1471 // Ensure the index is within the -cp range before assigning
1472 // to the classpath_index.
1473 if (SystemDictionary::is_system_class_loader(loader) &&
1474 (i >= ClassLoaderExt::app_class_paths_start_index()) &&
1475 (i < ClassLoaderExt::app_module_paths_start_index())) {
1476 classpath_index = i;
1477 break;
1478 } else {
1479 if ((i >= 1) &&
1480 (i < ClassLoaderExt::app_class_paths_start_index())) {
1481 // The class must be from boot loader append path which consists of
1482 // -Xbootclasspath/a and jvmti appended entries.
1483 assert(loader == NULL, "sanity");
1484 classpath_index = i;
1485 break;
1486 }
1487 }
1488 } else {
1489 // A class from a named module from the --module-path. Ensure the index is
1490 // within the --module-path range before assigning to the classpath_index.
1491 if ((pkg_entry != NULL) && !(pkg_entry->in_unnamed_module()) && (i > 0)) {
1492 if (i >= ClassLoaderExt::app_module_paths_start_index() &&
1493 i < FileMapInfo::get_number_of_shared_paths()) {
1494 classpath_index = i;
1495 break;
1496 }
1497 }
1498 }
1499 }
1500 // for index 0 and the stream->source() is the modules image or has the jrt: protocol.
1501 // The class must be from the runtime modules image.
1502 if (i == 0 && (is_modules_image(src) || string_starts_with(src, "jrt:"))) {
1503 classpath_index = i;
1504 break;
1505 }
1506 }
1507
1508 // No path entry found for this class. Must be a shared class loaded by the
1509 // user defined classloader.
1510 if (classpath_index < 0) {
1511 assert(ik->shared_classpath_index() < 0, "Sanity");
1512 return;
1513 }
1514 } else {
1515 // The shared path table is set up after module system initialization.
1516 // The path table contains no entry before that. Any classes loaded prior
1517 // to the setup of the shared path table must be from the modules image.
1518 assert(is_modules_image(src), "stream must be from modules image");
1519 assert(FileMapInfo::get_number_of_shared_paths() == 0, "shared path table must not have been setup");
1520 classpath_index = 0;
1521 }
1522
1523 const char* const class_name = ik->name()->as_C_string();
1524 const char* const file_name = file_name_for_class_name(class_name,
1525 ik->name()->utf8_length());
1526 assert(file_name != NULL, "invariant");
1527
1528 ClassLoaderExt::record_result(classpath_index, ik, THREAD);
1529 }
1530 #endif // INCLUDE_CDS
1531
1532 // Initialize the class loader's access to methods in libzip. Parse and
1533 // process the boot classpath into a list ClassPathEntry objects. Once
1534 // this list has been created, it must not change order (see class PackageInfo)
1535 // it can be appended to and is by jvmti and the kernel vm.
1536
1537 void ClassLoader::initialize() {
1538 EXCEPTION_MARK;
1539
1540 if (UsePerfData) {
1541 // jvmstat performance counters
1542 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1543 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1544 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1545 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1546 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1547 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1548 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1549 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1550 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1551 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1552
1553 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1554 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1555 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1556 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1557 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1558 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1559 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1560 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1561 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1562 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1563 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1564 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1565 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1566
1567
1568 // The following performance counters are added for measuring the impact
1569 // of the bug fix of 6365597. They are mainly focused on finding out
1570 // the behavior of system & user-defined classloader lock, whether
1571 // ClassLoader.loadClass/findClass is being called synchronized or not.
1572 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1573 "systemLoaderLockContentionRate");
1574 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1575 "nonSystemLoaderLockContentionRate");
1576 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1577 "jvmFindLoadedClassNoLockCalls");
1578 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1579 "jvmDefineClassNoLockCalls");
1580
1581 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1582 "jniDefineClassNoLockCalls");
1583
1584 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1585 "unsafeDefineClassCalls");
1586 }
1587
1588 // lookup zip library entry points
1589 load_zip_library();
1590 // lookup jimage library entry points
1591 load_jimage_library();
1592 #if INCLUDE_CDS
1593 // initialize search path
1594 if (DumpSharedSpaces) {
1595 _shared_paths_misc_info = new SharedPathsMiscInfo();
1596 }
1597 #endif
1598 setup_bootstrap_search_path();
1599 }
1600
1601 #if INCLUDE_CDS
1602 void ClassLoader::initialize_shared_path() {
1603 if (DumpSharedSpaces) {
1604 ClassLoaderExt::setup_search_paths();
1605 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1606 }
1607 }
1608
1609 void ClassLoader::initialize_module_path(TRAPS) {
1610 if (DumpSharedSpaces) {
1611 ClassLoaderExt::setup_module_paths(THREAD);
1612 FileMapInfo::allocate_shared_path_table();
1613 }
1614 }
1615 #endif
1616
1617 jlong ClassLoader::classloader_time_ms() {
1618 return UsePerfData ?
1619 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1620 }
1621
1622 jlong ClassLoader::class_init_count() {
1623 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1624 }
1625
1626 jlong ClassLoader::class_init_time_ms() {
1627 return UsePerfData ?
1628 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1629 }
1630
1631 jlong ClassLoader::class_verify_time_ms() {
1632 return UsePerfData ?
1633 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1634 }
1635
1636 jlong ClassLoader::class_link_count() {
1637 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1638 }
1639
1640 jlong ClassLoader::class_link_time_ms() {
1641 return UsePerfData ?
1642 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1643 }
1644
1645 int ClassLoader::compute_Object_vtable() {
1646 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1647 // code to determine actual value from file
1648 // Would be value '11' if finals were in vtable
1649 int JDK_1_2_Object_vtable_size = 5;
1650 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1651 }
1652
1653
1654 void classLoader_init1() {
1655 ClassLoader::initialize();
1656 }
1657
1658 // Complete the ClassPathEntry setup for the boot loader
1659 void ClassLoader::classLoader_init2(TRAPS) {
1660 // Setup the list of module/path pairs for --patch-module processing
1661 // This must be done after the SymbolTable is created in order
1662 // to use fast_compare on module names instead of a string compare.
1663 if (Arguments::get_patch_mod_prefix() != NULL) {
1664 setup_patch_mod_entries();
1665 }
1666
1667 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1668 // to successfully determine if java.base has been patched)
1669 create_javabase();
1670
1671 // Setup the initial java.base/path pair for the exploded build entries.
1672 // As more modules are defined during module system initialization, more
1673 // entries will be added to the exploded build array.
1674 if (!has_jrt_entry()) {
1675 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1676 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1677 // Set up the boot loader's _exploded_entries list. Note that this gets
1678 // done before loading any classes, by the same thread that will
1679 // subsequently do the first class load. So, no lock is needed for this.
1680 assert(_exploded_entries == NULL, "Should only get initialized once");
1681 _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1682 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
1683 add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1684 }
1685 }
1686
1687
1688 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1689 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1690 if (CanonicalizeEntry != NULL) {
1691 JavaThread* THREAD = JavaThread::current();
1692 JNIEnv* env = THREAD->jni_environment();
1693 ResourceMark rm(THREAD);
1694
1695 // os::native_path writes into orig_copy
1696 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1697 strcpy(orig_copy, orig);
1698 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1699 return false;
1700 }
1701 } else {
1702 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1703 strncpy(out, orig, len);
1704 out[len - 1] = '\0';
1705 }
1706 return true;
1707 }
1708
1709 void ClassLoader::create_javabase() {
1710 Thread* THREAD = Thread::current();
1711
1712 // Create java.base's module entry for the boot
1713 // class loader prior to loading j.l.Ojbect.
1714 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1715
1716 // Get module entry table
1717 ModuleEntryTable* null_cld_modules = null_cld->modules();
1718 if (null_cld_modules == NULL) {
1719 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1720 }
1721
1722 {
1723 MutexLocker ml(Module_lock, THREAD);
1724 ModuleEntry* jb_module = null_cld_modules->locked_create_entry(Handle(),
1725 false, vmSymbols::java_base(), NULL, NULL, null_cld);
1726 if (jb_module == NULL) {
1727 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1728 }
1729 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1730 }
1731 }
1732
1733 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1734 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1735 void PerfClassTraceTime::initialize() {
1736 if (!UsePerfData) return;
1737
1738 if (_eventp != NULL) {
1739 // increment the event counter
1740 _eventp->inc();
1741 }
1742
1743 // stop the current active thread-local timer to measure inclusive time
1744 _prev_active_event = -1;
1745 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1746 if (_timers[i].is_active()) {
1747 assert(_prev_active_event == -1, "should have only one active timer");
1748 _prev_active_event = i;
1749 _timers[i].stop();
1750 }
1751 }
1752
1753 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1754 // start the inclusive timer if not recursively called
1755 _t.start();
1756 }
1757
1758 // start thread-local timer of the given event type
1759 if (!_timers[_event_type].is_active()) {
1760 _timers[_event_type].start();
1761 }
1762 }
1763
1764 PerfClassTraceTime::~PerfClassTraceTime() {
1765 if (!UsePerfData) return;
1766
1767 // stop the thread-local timer as the event completes
1768 // and resume the thread-local timer of the event next on the stack
1769 _timers[_event_type].stop();
1770 jlong selftime = _timers[_event_type].ticks();
1771
1772 if (_prev_active_event >= 0) {
1773 _timers[_prev_active_event].start();
1774 }
1775
1776 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1777
1778 // increment the counters only on the leaf call
1779 _t.stop();
1780 _timep->inc(_t.ticks());
1781 if (_selftimep != NULL) {
1782 _selftimep->inc(selftime);
1783 }
1784 // add all class loading related event selftime to the accumulated time counter
1785 ClassLoader::perf_accumulated_time()->inc(selftime);
1786
1787 // reset the timer
1788 _timers[_event_type].reset();
1789 }