1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "jimage.hpp"
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.inline.hpp"
30 #include "classfile/classLoaderData.inline.hpp"
31 #include "classfile/classLoaderExt.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/modules.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/klassFactory.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/systemDictionaryShared.hpp"
40 #include "classfile/vmSymbols.hpp"
41 #include "compiler/compileBroker.hpp"
42 #include "interpreter/bytecodeStream.hpp"
43 #include "interpreter/oopMapCache.hpp"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "logging/logTag.hpp"
47 #include "memory/allocation.inline.hpp"
48 #include "memory/filemap.hpp"
49 #include "memory/oopFactory.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "oops/instanceKlass.hpp"
53 #include "oops/instanceRefKlass.hpp"
54 #include "oops/method.inline.hpp"
55 #include "oops/objArrayOop.inline.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "oops/symbol.hpp"
58 #include "prims/jvm_misc.hpp"
59 #include "runtime/arguments.hpp"
60 #include "runtime/compilationPolicy.hpp"
61 #include "runtime/handles.inline.hpp"
62 #include "runtime/init.hpp"
63 #include "runtime/interfaceSupport.inline.hpp"
64 #include "runtime/java.hpp"
65 #include "runtime/javaCalls.hpp"
66 #include "runtime/os.inline.hpp"
67 #include "runtime/threadCritical.hpp"
68 #include "runtime/timer.hpp"
69 #include "runtime/vm_version.hpp"
70 #include "services/management.hpp"
71 #include "services/threadService.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/hashtable.inline.hpp"
74 #include "utilities/macros.hpp"
75 #if INCLUDE_CDS
76 #include "classfile/sharedPathsMiscInfo.hpp"
77 #endif
78
79 // Entry points in zip.dll for loading zip/jar file entries
80
81 typedef void * * (*ZipOpen_t)(const char *name, char **pmsg);
82 typedef void (*ZipClose_t)(jzfile *zip);
83 typedef jzentry* (*FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
84 typedef jboolean (*ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
85 typedef jzentry* (*GetNextEntry_t)(jzfile *zip, jint n);
86 typedef jboolean (*ZipInflateFully_t)(void *inBuf, jlong inLen, void *outBuf, jlong outLen, char **pmsg);
87 typedef jint (*Crc32_t)(jint crc, const jbyte *buf, jint len);
88
89 static ZipOpen_t ZipOpen = NULL;
90 static ZipClose_t ZipClose = NULL;
91 static FindEntry_t FindEntry = NULL;
92 static ReadEntry_t ReadEntry = NULL;
93 static GetNextEntry_t GetNextEntry = NULL;
94 static canonicalize_fn_t CanonicalizeEntry = NULL;
95 static ZipInflateFully_t ZipInflateFully = NULL;
96 static Crc32_t Crc32 = NULL;
97
98 // Entry points for jimage.dll for loading jimage file entries
99
100 static JImageOpen_t JImageOpen = NULL;
101 static JImageClose_t JImageClose = NULL;
102 static JImagePackageToModule_t JImagePackageToModule = NULL;
103 static JImageFindResource_t JImageFindResource = NULL;
104 static JImageGetResource_t JImageGetResource = NULL;
105 static JImageResourceIterator_t JImageResourceIterator = NULL;
106
107 // Globals
108
109 PerfCounter* ClassLoader::_perf_accumulated_time = NULL;
110 PerfCounter* ClassLoader::_perf_classes_inited = NULL;
111 PerfCounter* ClassLoader::_perf_class_init_time = NULL;
112 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL;
113 PerfCounter* ClassLoader::_perf_classes_verified = NULL;
114 PerfCounter* ClassLoader::_perf_class_verify_time = NULL;
115 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL;
116 PerfCounter* ClassLoader::_perf_classes_linked = NULL;
117 PerfCounter* ClassLoader::_perf_class_link_time = NULL;
118 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL;
119 PerfCounter* ClassLoader::_perf_class_parse_time = NULL;
120 PerfCounter* ClassLoader::_perf_class_parse_selftime = NULL;
121 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL;
122 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL;
123 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL;
124 PerfCounter* ClassLoader::_perf_app_classload_time = NULL;
125 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL;
126 PerfCounter* ClassLoader::_perf_app_classload_count = NULL;
127 PerfCounter* ClassLoader::_perf_define_appclasses = NULL;
128 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL;
129 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL;
130 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL;
131 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL;
132 PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
133 PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
134 PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
135 PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
136 PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
137 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL;
138
139 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL;
140 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL;
141 ClassPathEntry* ClassLoader::_jrt_entry = NULL;
142 ClassPathEntry* ClassLoader::_first_append_entry = NULL;
143 ClassPathEntry* ClassLoader::_last_append_entry = NULL;
144 #if INCLUDE_CDS
145 ClassPathEntry* ClassLoader::_app_classpath_entries = NULL;
146 ClassPathEntry* ClassLoader::_last_app_classpath_entry = NULL;
147 ClassPathEntry* ClassLoader::_module_path_entries = NULL;
148 ClassPathEntry* ClassLoader::_last_module_path_entry = NULL;
149 SharedPathsMiscInfo* ClassLoader::_shared_paths_misc_info = NULL;
150 #endif
151
152 // helper routines
153 bool string_starts_with(const char* str, const char* str_to_find) {
154 size_t str_len = strlen(str);
155 size_t str_to_find_len = strlen(str_to_find);
156 if (str_to_find_len > str_len) {
157 return false;
158 }
159 return (strncmp(str, str_to_find, str_to_find_len) == 0);
160 }
161
162 static const char* get_jimage_version_string() {
163 static char version_string[10] = "";
164 if (version_string[0] == '\0') {
165 jio_snprintf(version_string, sizeof(version_string), "%d.%d",
166 VM_Version::vm_major_version(), VM_Version::vm_minor_version());
167 }
168 return (const char*)version_string;
169 }
170
171 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
172 size_t str_len = strlen(str);
173 size_t str_to_find_len = strlen(str_to_find);
174 if (str_to_find_len > str_len) {
175 return false;
176 }
177 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
178 }
179
180 // Used to obtain the package name from a fully qualified class name.
181 // It is the responsibility of the caller to establish a ResourceMark.
182 const char* ClassLoader::package_from_name(const char* const class_name, bool* bad_class_name) {
183 if (class_name == NULL) {
184 if (bad_class_name != NULL) {
185 *bad_class_name = true;
186 }
187 return NULL;
188 }
189
190 if (bad_class_name != NULL) {
191 *bad_class_name = false;
192 }
193
194 const char* const last_slash = strrchr(class_name, '/');
195 if (last_slash == NULL) {
196 // No package name
197 return NULL;
198 }
199
200 char* class_name_ptr = (char*) class_name;
201 // Skip over '['s
202 if (*class_name_ptr == '[') {
203 do {
204 class_name_ptr++;
205 } while (*class_name_ptr == '[');
206
207 // Fully qualified class names should not contain a 'L'.
208 // Set bad_class_name to true to indicate that the package name
209 // could not be obtained due to an error condition.
210 // In this situation, is_same_class_package returns false.
211 if (*class_name_ptr == 'L') {
212 if (bad_class_name != NULL) {
213 *bad_class_name = true;
214 }
215 return NULL;
216 }
217 }
218
219 int length = last_slash - class_name_ptr;
220
221 // A class name could have just the slash character in the name.
222 if (length <= 0) {
223 // No package name
224 if (bad_class_name != NULL) {
225 *bad_class_name = true;
226 }
227 return NULL;
228 }
229
230 // drop name after last slash (including slash)
231 // Ex., "java/lang/String.class" => "java/lang"
232 char* pkg_name = NEW_RESOURCE_ARRAY(char, length + 1);
233 strncpy(pkg_name, class_name_ptr, length);
234 *(pkg_name+length) = '\0';
235
236 return (const char *)pkg_name;
237 }
238
239 // Given a fully qualified class name, find its defining package in the class loader's
240 // package entry table.
241 PackageEntry* ClassLoader::get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS) {
242 ResourceMark rm(THREAD);
243 const char *pkg_name = ClassLoader::package_from_name(class_name);
244 if (pkg_name == NULL) {
245 return NULL;
246 }
247 PackageEntryTable* pkgEntryTable = loader_data->packages();
248 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(pkg_name);
249 return pkgEntryTable->lookup_only(pkg_symbol);
250 }
251
252 ClassPathDirEntry::ClassPathDirEntry(const char* dir) : ClassPathEntry() {
253 char* copy = NEW_C_HEAP_ARRAY(char, strlen(dir)+1, mtClass);
254 strcpy(copy, dir);
255 _dir = copy;
256 }
257
258
259 ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
260 // construct full path name
261 assert((_dir != NULL) && (name != NULL), "sanity");
262 size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1;
263 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, path_len);
264 int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name);
265 assert(len == (int)(path_len - 1), "sanity");
266 // check if file exists
267 struct stat st;
268 if (os::stat(path, &st) == 0) {
269 // found file, open it
270 int file_handle = os::open(path, 0, 0);
271 if (file_handle != -1) {
272 // read contents into resource array
273 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
274 size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
275 // close file
276 os::close(file_handle);
277 // construct ClassFileStream
278 if (num_read == (size_t)st.st_size) {
279 if (UsePerfData) {
280 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
281 }
282 FREE_RESOURCE_ARRAY(char, path, path_len);
283 // Resource allocated
284 return new ClassFileStream(buffer,
285 st.st_size,
286 _dir,
287 ClassFileStream::verify);
288 }
289 }
290 }
291 FREE_RESOURCE_ARRAY(char, path, path_len);
292 return NULL;
293 }
294
295 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name,
296 bool is_boot_append, bool from_class_path_attr) : ClassPathEntry() {
297 _zip = zip;
298 char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
299 strcpy(copy, zip_name);
300 _zip_name = copy;
301 _from_class_path_attr = from_class_path_attr;
302 }
303
304 ClassPathZipEntry::~ClassPathZipEntry() {
305 if (ZipClose != NULL) {
306 (*ZipClose)(_zip);
307 }
308 FREE_C_HEAP_ARRAY(char, _zip_name);
309 }
310
311 u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS) {
312 // enable call to C land
313 JavaThread* thread = JavaThread::current();
314 ThreadToNativeFromVM ttn(thread);
315 // check whether zip archive contains name
316 jint name_len;
317 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
318 if (entry == NULL) return NULL;
319 u1* buffer;
320 char name_buf[128];
321 char* filename;
322 if (name_len < 128) {
323 filename = name_buf;
324 } else {
325 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
326 }
327
328 // read contents into resource array
329 int size = (*filesize) + ((nul_terminate) ? 1 : 0);
330 buffer = NEW_RESOURCE_ARRAY(u1, size);
331 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
332
333 // return result
334 if (nul_terminate) {
335 buffer[*filesize] = 0;
336 }
337 return buffer;
338 }
339
340 ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
341 jint filesize;
342 u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
343 if (buffer == NULL) {
344 return NULL;
345 }
346 if (UsePerfData) {
347 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
348 }
349 // Resource allocated
350 return new ClassFileStream(buffer,
351 filesize,
352 _zip_name,
353 ClassFileStream::verify);
354 }
355
356 // invoke function for each entry in the zip file
357 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
358 JavaThread* thread = JavaThread::current();
359 HandleMark handle_mark(thread);
360 ThreadToNativeFromVM ttn(thread);
361 for (int n = 0; ; n++) {
362 jzentry * ze = ((*GetNextEntry)(_zip, n));
363 if (ze == NULL) break;
364 (*f)(ze->name, context);
365 }
366 }
367
368 DEBUG_ONLY(ClassPathImageEntry* ClassPathImageEntry::_singleton = NULL;)
369
370 void ClassPathImageEntry::close_jimage() {
371 if (_jimage != NULL) {
372 (*JImageClose)(_jimage);
373 _jimage = NULL;
374 }
375 }
376
377 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
378 ClassPathEntry(),
379 _jimage(jimage) {
380 guarantee(jimage != NULL, "jimage file is null");
381 guarantee(name != NULL, "jimage file name is null");
382 assert(_singleton == NULL, "VM supports only one jimage");
383 DEBUG_ONLY(_singleton = this);
384 size_t len = strlen(name) + 1;
385 _name = NEW_C_HEAP_ARRAY(const char, len, mtClass);
386 strncpy((char *)_name, name, len);
387 }
388
389 ClassPathImageEntry::~ClassPathImageEntry() {
390 assert(_singleton == this, "must be");
391 DEBUG_ONLY(_singleton = NULL);
392
393 if (_name != NULL) {
394 FREE_C_HEAP_ARRAY(const char, _name);
395 _name = NULL;
396 }
397 if (_jimage != NULL) {
398 (*JImageClose)(_jimage);
399 _jimage = NULL;
400 }
401 }
402
403 ClassFileStream* ClassPathImageEntry::open_stream(const char* name, TRAPS) {
404 return open_stream_for_loader(name, ClassLoaderData::the_null_class_loader_data(), THREAD);
405 }
406
407 // For a class in a named module, look it up in the jimage file using this syntax:
408 // /<module-name>/<package-name>/<base-class>
409 //
410 // Assumptions:
411 // 1. There are no unnamed modules in the jimage file.
412 // 2. A package is in at most one module in the jimage file.
413 //
414 ClassFileStream* ClassPathImageEntry::open_stream_for_loader(const char* name, ClassLoaderData* loader_data, TRAPS) {
415 jlong size;
416 JImageLocationRef location = (*JImageFindResource)(_jimage, "", get_jimage_version_string(), name, &size);
417
418 if (location == 0) {
419 ResourceMark rm;
420 const char* pkg_name = ClassLoader::package_from_name(name);
421
422 if (pkg_name != NULL) {
423 if (!Universe::is_module_initialized()) {
424 location = (*JImageFindResource)(_jimage, JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
425 } else {
426 PackageEntry* package_entry = ClassLoader::get_package_entry(name, loader_data, CHECK_NULL);
427 if (package_entry != NULL) {
428 ResourceMark rm;
429 // Get the module name
430 ModuleEntry* module = package_entry->module();
431 assert(module != NULL, "Boot classLoader package missing module");
432 assert(module->is_named(), "Boot classLoader package is in unnamed module");
433 const char* module_name = module->name()->as_C_string();
434 if (module_name != NULL) {
435 location = (*JImageFindResource)(_jimage, module_name, get_jimage_version_string(), name, &size);
436 }
437 }
438 }
439 }
440 }
441 if (location != 0) {
442 if (UsePerfData) {
443 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
444 }
445 char* data = NEW_RESOURCE_ARRAY(char, size);
446 (*JImageGetResource)(_jimage, location, data, size);
447 // Resource allocated
448 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be");
449 return new ClassFileStream((u1*)data,
450 (int)size,
451 _name,
452 ClassFileStream::verify,
453 true); // from_boot_loader_modules_image
454 }
455
456 return NULL;
457 }
458
459 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
460 const char* module_name,
461 const char* file_name,
462 jlong &size) {
463 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
464 }
465
466 bool ClassPathImageEntry::is_modules_image() const {
467 assert(this == _singleton, "VM supports a single jimage");
468 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be used for jrt entry");
469 return true;
470 }
471
472 #if INCLUDE_CDS
473 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
474 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "only called at dump time");
475 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
476 vm_exit_during_initialization(error, message);
477 }
478 #endif
479
480 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
481 _module_name = module_name;
482 _module_first_entry = NULL;
483 _module_last_entry = NULL;
484 }
485
486 ModuleClassPathList::~ModuleClassPathList() {
487 // Clean out each ClassPathEntry on list
488 ClassPathEntry* e = _module_first_entry;
489 while (e != NULL) {
490 ClassPathEntry* next_entry = e->next();
491 delete e;
492 e = next_entry;
493 }
494 }
495
496 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
497 if (new_entry != NULL) {
498 if (_module_last_entry == NULL) {
499 _module_first_entry = _module_last_entry = new_entry;
500 } else {
501 _module_last_entry->set_next(new_entry);
502 _module_last_entry = new_entry;
503 }
504 }
505 }
506
507 void ClassLoader::trace_class_path(const char* msg, const char* name) {
508 LogTarget(Info, class, path) lt;
509 if (lt.is_enabled()) {
510 LogStream ls(lt);
511 if (msg) {
512 ls.print("%s", msg);
513 }
514 if (name) {
515 if (strlen(name) < 256) {
516 ls.print("%s", name);
517 } else {
518 // For very long paths, we need to print each character separately,
519 // as print_cr() has a length limit
520 while (name[0] != '\0') {
521 ls.print("%c", name[0]);
522 name++;
523 }
524 }
525 }
526 ls.cr();
527 }
528 }
529
530 void ClassLoader::setup_bootstrap_search_path() {
531 const char* sys_class_path = Arguments::get_sysclasspath();
532 assert(sys_class_path != NULL, "System boot class path must not be NULL");
533 if (PrintSharedArchiveAndExit) {
534 // Don't print sys_class_path - this is the bootcp of this current VM process, not necessarily
535 // the same as the bootcp of the shared archive.
536 } else {
537 trace_class_path("bootstrap loader class path=", sys_class_path);
538 }
539 #if INCLUDE_CDS
540 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
541 _shared_paths_misc_info->add_boot_classpath(sys_class_path);
542 }
543 #endif
544 setup_boot_search_path(sys_class_path);
545 }
546
547 #if INCLUDE_CDS
548 int ClassLoader::get_shared_paths_misc_info_size() {
549 return _shared_paths_misc_info->get_used_bytes();
550 }
551
552 void* ClassLoader::get_shared_paths_misc_info() {
553 return _shared_paths_misc_info->buffer();
554 }
555
556 bool ClassLoader::check_shared_paths_misc_info(void *buf, int size, bool is_static) {
557 SharedPathsMiscInfo* checker = new SharedPathsMiscInfo((char*)buf, size);
558 bool result = checker->check(is_static);
559 delete checker;
560 return result;
561 }
562
563 void ClassLoader::setup_app_search_path(const char *class_path) {
564
565 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "Sanity");
566
567 Thread* THREAD = Thread::current();
568 int len = (int)strlen(class_path);
569 int end = 0;
570
571 // Iterate over class path entries
572 for (int start = 0; start < len; start = end) {
573 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
574 end++;
575 }
576 EXCEPTION_MARK;
577 ResourceMark rm(THREAD);
578 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
579 strncpy(path, &class_path[start], end - start);
580 path[end - start] = '\0';
581
582 update_class_path_entry_list(path, false, false, false);
583
584 while (class_path[end] == os::path_separator()[0]) {
585 end++;
586 }
587 }
588 }
589
590 void ClassLoader::add_to_module_path_entries(const char* path,
591 ClassPathEntry* entry) {
592 assert(entry != NULL, "ClassPathEntry should not be NULL");
593 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "dump time only");
594
595 // The entry does not exist, add to the list
596 if (_module_path_entries == NULL) {
597 assert(_last_module_path_entry == NULL, "Sanity");
598 _module_path_entries = _last_module_path_entry = entry;
599 } else {
600 _last_module_path_entry->set_next(entry);
601 _last_module_path_entry = entry;
602 }
603 }
604
605 // Add a module path to the _module_path_entries list.
606 void ClassLoader::update_module_path_entry_list(const char *path, TRAPS) {
607 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "dump time only");
608 struct stat st;
609 if (os::stat(path, &st) != 0) {
610 tty->print_cr("os::stat error %d (%s). CDS dump aborted (path was \"%s\").",
611 errno, os::errno_name(errno), path);
612 vm_exit_during_initialization();
613 }
614 // File or directory found
615 ClassPathEntry* new_entry = NULL;
616 new_entry = create_class_path_entry(path, &st, true /* throw_exception */,
617 false /*is_boot_append */, false /* from_class_path_attr */, CHECK);
618 if (new_entry == NULL) {
619 return;
620 }
621
622 add_to_module_path_entries(path, new_entry);
623 return;
624 }
625
626 void ClassLoader::setup_module_search_path(const char* path, TRAPS) {
627 update_module_path_entry_list(path, THREAD);
628 }
629
630 #endif // INCLUDE_CDS
631
632 void ClassLoader::close_jrt_image() {
633 // Not applicable for exploded builds
634 if (!ClassLoader::has_jrt_entry()) return;
635 _jrt_entry->close_jimage();
636 }
637
638 // Construct the array of module/path pairs as specified to --patch-module
639 // for the boot loader to search ahead of the jimage, if the class being
640 // loaded is defined to a module that has been specified to --patch-module.
641 void ClassLoader::setup_patch_mod_entries() {
642 Thread* THREAD = Thread::current();
643 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
644 int num_of_entries = patch_mod_args->length();
645
646
647 // Set up the boot loader's _patch_mod_entries list
648 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, true);
649
650 for (int i = 0; i < num_of_entries; i++) {
651 const char* module_name = (patch_mod_args->at(i))->module_name();
652 Symbol* const module_sym = SymbolTable::new_symbol(module_name);
653 assert(module_sym != NULL, "Failed to obtain Symbol for module name");
654 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
655
656 char* class_path = (patch_mod_args->at(i))->path_string();
657 int len = (int)strlen(class_path);
658 int end = 0;
659 // Iterate over the module's class path entries
660 for (int start = 0; start < len; start = end) {
661 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
662 end++;
663 }
664 EXCEPTION_MARK;
665 ResourceMark rm(THREAD);
666 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
667 strncpy(path, &class_path[start], end - start);
668 path[end - start] = '\0';
669
670 struct stat st;
671 if (os::stat(path, &st) == 0) {
672 // File or directory found
673 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, false, CHECK);
674 // If the path specification is valid, enter it into this module's list
675 if (new_entry != NULL) {
676 module_cpl->add_to_list(new_entry);
677 }
678 }
679
680 while (class_path[end] == os::path_separator()[0]) {
681 end++;
682 }
683 }
684
685 // Record the module into the list of --patch-module entries only if
686 // valid ClassPathEntrys have been created
687 if (module_cpl->module_first_entry() != NULL) {
688 _patch_mod_entries->push(module_cpl);
689 }
690 }
691 }
692
693 // Determine whether the module has been patched via the command-line
694 // option --patch-module
695 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
696 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
697 int table_len = _patch_mod_entries->length();
698 for (int i = 0; i < table_len; i++) {
699 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
700 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
701 return true;
702 }
703 }
704 }
705 return false;
706 }
707
708 // Set up the _jrt_entry if present and boot append path
709 void ClassLoader::setup_boot_search_path(const char *class_path) {
710 int len = (int)strlen(class_path);
711 int end = 0;
712 bool set_base_piece = true;
713
714 #if INCLUDE_CDS
715 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
716 if (!Arguments::has_jimage()) {
717 vm_exit_during_initialization("CDS is not supported in exploded JDK build", NULL);
718 }
719 }
720 #endif
721
722 // Iterate over class path entries
723 for (int start = 0; start < len; start = end) {
724 while (class_path[end] && class_path[end] != os::path_separator()[0]) {
725 end++;
726 }
727 EXCEPTION_MARK;
728 ResourceMark rm(THREAD);
729 char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
730 strncpy(path, &class_path[start], end - start);
731 path[end - start] = '\0';
732
733 if (set_base_piece) {
734 // The first time through the bootstrap_search setup, it must be determined
735 // what the base or core piece of the boot loader search is. Either a java runtime
736 // image is present or this is an exploded module build situation.
737 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
738 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
739 struct stat st;
740 if (os::stat(path, &st) == 0) {
741 // Directory found
742 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, false, CHECK);
743
744 // Check for a jimage
745 if (Arguments::has_jimage()) {
746 assert(_jrt_entry == NULL, "should not setup bootstrap class search path twice");
747 _jrt_entry = new_entry;
748 assert(new_entry != NULL && new_entry->is_modules_image(), "No java runtime image present");
749 assert(_jrt_entry->jimage() != NULL, "No java runtime image");
750 }
751 } else {
752 // If path does not exist, exit
753 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
754 }
755 set_base_piece = false;
756 } else {
757 // Every entry on the system boot class path after the initial base piece,
758 // which is set by os::set_boot_path(), is considered an appended entry.
759 update_class_path_entry_list(path, false, true, false);
760 }
761
762 while (class_path[end] == os::path_separator()[0]) {
763 end++;
764 }
765 }
766 }
767
768 // During an exploded modules build, each module defined to the boot loader
769 // will be added to the ClassLoader::_exploded_entries array.
770 void ClassLoader::add_to_exploded_build_list(Symbol* module_sym, TRAPS) {
771 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
772 assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
773
774 // Find the module's symbol
775 ResourceMark rm(THREAD);
776 const char *module_name = module_sym->as_C_string();
777 const char *home = Arguments::get_java_home();
778 const char file_sep = os::file_separator()[0];
779 // 10 represents the length of "modules" + 2 file separators + \0
780 size_t len = strlen(home) + strlen(module_name) + 10;
781 char *path = NEW_RESOURCE_ARRAY(char, len);
782 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
783
784 struct stat st;
785 if (os::stat(path, &st) == 0) {
786 // Directory found
787 ClassPathEntry* new_entry = create_class_path_entry(path, &st, false, false, false, CHECK);
788
789 // If the path specification is valid, enter it into this module's list.
790 // There is no need to check for duplicate modules in the exploded entry list,
791 // since no two modules with the same name can be defined to the boot loader.
792 // This is checked at module definition time in Modules::define_module.
793 if (new_entry != NULL) {
794 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
795 module_cpl->add_to_list(new_entry);
796 {
797 MutexLocker ml(Module_lock, THREAD);
798 _exploded_entries->push(module_cpl);
799 }
800 log_info(class, load)("path: %s", path);
801 }
802 }
803 }
804
805 ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
806 bool throw_exception,
807 bool is_boot_append,
808 bool from_class_path_attr,
809 TRAPS) {
810 JavaThread* thread = JavaThread::current();
811 ClassPathEntry* new_entry = NULL;
812 if ((st->st_mode & S_IFMT) == S_IFREG) {
813 ResourceMark rm(thread);
814 // Regular file, should be a zip or jimage file
815 // Canonicalized filename
816 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
817 if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
818 // This matches the classic VM
819 if (throw_exception) {
820 THROW_MSG_(vmSymbols::java_io_IOException(), "Bad pathname", NULL);
821 } else {
822 return NULL;
823 }
824 }
825 jint error;
826 JImageFile* jimage =(*JImageOpen)(canonical_path, &error);
827 if (jimage != NULL) {
828 new_entry = new ClassPathImageEntry(jimage, canonical_path);
829 } else {
830 char* error_msg = NULL;
831 jzfile* zip;
832 {
833 // enable call to C land
834 ThreadToNativeFromVM ttn(thread);
835 HandleMark hm(thread);
836 zip = (*ZipOpen)(canonical_path, &error_msg);
837 }
838 if (zip != NULL && error_msg == NULL) {
839 new_entry = new ClassPathZipEntry(zip, path, is_boot_append, from_class_path_attr);
840 } else {
841 char *msg;
842 if (error_msg == NULL) {
843 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(path) + 128); ;
844 jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
845 } else {
846 int len = (int)(strlen(path) + strlen(error_msg) + 128);
847 msg = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, len); ;
848 jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
849 }
850 // Don't complain about bad jar files added via -Xbootclasspath/a:.
851 if (throw_exception && is_init_completed()) {
852 THROW_MSG_(vmSymbols::java_lang_ClassNotFoundException(), msg, NULL);
853 } else {
854 return NULL;
855 }
856 }
857 }
858 log_info(class, path)("opened: %s", path);
859 log_info(class, load)("opened: %s", path);
860 } else {
861 // Directory
862 new_entry = new ClassPathDirEntry(path);
863 log_info(class, load)("path: %s", path);
864 }
865 return new_entry;
866 }
867
868
869 // Create a class path zip entry for a given path (return NULL if not found
870 // or zip/JAR file cannot be opened)
871 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
872 // check for a regular file
873 struct stat st;
874 if (os::stat(path, &st) == 0) {
875 if ((st.st_mode & S_IFMT) == S_IFREG) {
876 char canonical_path[JVM_MAXPATHLEN];
877 if (get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
878 char* error_msg = NULL;
879 jzfile* zip;
880 {
881 // enable call to C land
882 JavaThread* thread = JavaThread::current();
883 ThreadToNativeFromVM ttn(thread);
884 HandleMark hm(thread);
885 zip = (*ZipOpen)(canonical_path, &error_msg);
886 }
887 if (zip != NULL && error_msg == NULL) {
888 // create using canonical path
889 return new ClassPathZipEntry(zip, canonical_path, is_boot_append, false);
890 }
891 }
892 }
893 }
894 return NULL;
895 }
896
897 // returns true if entry already on class path
898 bool ClassLoader::contains_append_entry(const char* name) {
899 ClassPathEntry* e = _first_append_entry;
900 while (e != NULL) {
901 // assume zip entries have been canonicalized
902 if (strcmp(name, e->name()) == 0) {
903 return true;
904 }
905 e = e->next();
906 }
907 return false;
908 }
909
910 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
911 if (new_entry != NULL) {
912 if (_last_append_entry == NULL) {
913 assert(_first_append_entry == NULL, "boot loader's append class path entry list not empty");
914 _first_append_entry = _last_append_entry = new_entry;
915 } else {
916 _last_append_entry->set_next(new_entry);
917 _last_append_entry = new_entry;
918 }
919 }
920 }
921
922 // Record the path entries specified in -cp during dump time. The recorded
923 // information will be used at runtime for loading the archived app classes.
924 //
925 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for
926 // loading app classes. Instead, the app class are loaded by the
927 // jdk/internal/loader/ClassLoaders$AppClassLoader instance.
928 void ClassLoader::add_to_app_classpath_entries(const char* path,
929 ClassPathEntry* entry,
930 bool check_for_duplicates) {
931 #if INCLUDE_CDS
932 assert(entry != NULL, "ClassPathEntry should not be NULL");
933 ClassPathEntry* e = _app_classpath_entries;
934 if (check_for_duplicates) {
935 while (e != NULL) {
936 if (strcmp(e->name(), entry->name()) == 0) {
937 // entry already exists
938 return;
939 }
940 e = e->next();
941 }
942 }
943
944 // The entry does not exist, add to the list
945 if (_app_classpath_entries == NULL) {
946 assert(_last_app_classpath_entry == NULL, "Sanity");
947 _app_classpath_entries = _last_app_classpath_entry = entry;
948 } else {
949 _last_app_classpath_entry->set_next(entry);
950 _last_app_classpath_entry = entry;
951 }
952
953 if (entry->is_jar_file()) {
954 ClassLoaderExt::process_jar_manifest(entry, check_for_duplicates);
955 }
956 #endif
957 }
958
959 // Returns true IFF the file/dir exists and the entry was successfully created.
960 bool ClassLoader::update_class_path_entry_list(const char *path,
961 bool check_for_duplicates,
962 bool is_boot_append,
963 bool from_class_path_attr,
964 bool throw_exception) {
965 struct stat st;
966 if (os::stat(path, &st) == 0) {
967 // File or directory found
968 ClassPathEntry* new_entry = NULL;
969 Thread* THREAD = Thread::current();
970 new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, from_class_path_attr, CHECK_(false));
971 if (new_entry == NULL) {
972 return false;
973 }
974
975 // Do not reorder the bootclasspath which would break get_system_package().
976 // Add new entry to linked list
977 if (is_boot_append) {
978 add_to_boot_append_entries(new_entry);
979 } else {
980 add_to_app_classpath_entries(path, new_entry, check_for_duplicates);
981 }
982 return true;
983 } else {
984 #if INCLUDE_CDS
985 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
986 _shared_paths_misc_info->add_nonexist_path(path);
987 }
988 #endif
989 return false;
990 }
991 }
992
993 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
994 ResourceMark rm;
995 int num_of_entries = module_list->length();
996 for (int i = 0; i < num_of_entries; i++) {
997 ClassPathEntry* e;
998 ModuleClassPathList* mpl = module_list->at(i);
999 tty->print("%s=", mpl->module_name()->as_C_string());
1000 e = mpl->module_first_entry();
1001 while (e != NULL) {
1002 tty->print("%s", e->name());
1003 e = e->next();
1004 if (e != NULL) {
1005 tty->print("%s", os::path_separator());
1006 }
1007 }
1008 tty->print(" ;");
1009 }
1010 }
1011
1012 void ClassLoader::print_bootclasspath() {
1013 ClassPathEntry* e;
1014 tty->print("[bootclasspath= ");
1015
1016 // Print --patch-module module/path specifications first
1017 if (_patch_mod_entries != NULL) {
1018 print_module_entry_table(_patch_mod_entries);
1019 }
1020
1021 // [jimage | exploded modules build]
1022 if (has_jrt_entry()) {
1023 // Print the location of the java runtime image
1024 tty->print("%s ;", _jrt_entry->name());
1025 } else {
1026 // Print exploded module build path specifications
1027 if (_exploded_entries != NULL) {
1028 print_module_entry_table(_exploded_entries);
1029 }
1030 }
1031
1032 // appended entries
1033 e = _first_append_entry;
1034 while (e != NULL) {
1035 tty->print("%s ;", e->name());
1036 e = e->next();
1037 }
1038 tty->print_cr("]");
1039 }
1040
1041 void ClassLoader::load_zip_library() {
1042 assert(ZipOpen == NULL, "should not load zip library twice");
1043 // First make sure native library is loaded
1044 os::native_java_library();
1045 // Load zip library
1046 char path[JVM_MAXPATHLEN];
1047 char ebuf[1024];
1048 void* handle = NULL;
1049 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
1050 handle = os::dll_load(path, ebuf, sizeof ebuf);
1051 }
1052 if (handle == NULL) {
1053 vm_exit_during_initialization("Unable to load ZIP library", path);
1054 }
1055 // Lookup zip entry points
1056 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, os::dll_lookup(handle, "ZIP_Open"));
1057 ZipClose = CAST_TO_FN_PTR(ZipClose_t, os::dll_lookup(handle, "ZIP_Close"));
1058 FindEntry = CAST_TO_FN_PTR(FindEntry_t, os::dll_lookup(handle, "ZIP_FindEntry"));
1059 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, os::dll_lookup(handle, "ZIP_ReadEntry"));
1060 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, os::dll_lookup(handle, "ZIP_GetNextEntry"));
1061 ZipInflateFully = CAST_TO_FN_PTR(ZipInflateFully_t, os::dll_lookup(handle, "ZIP_InflateFully"));
1062 Crc32 = CAST_TO_FN_PTR(Crc32_t, os::dll_lookup(handle, "ZIP_CRC32"));
1063
1064 // ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
1065 if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL ||
1066 GetNextEntry == NULL || Crc32 == NULL) {
1067 vm_exit_during_initialization("Corrupted ZIP library", path);
1068 }
1069
1070 if (ZipInflateFully == NULL) {
1071 vm_exit_during_initialization("Corrupted ZIP library ZIP_InflateFully missing", path);
1072 }
1073
1074 // Lookup canonicalize entry in libjava.dll
1075 void *javalib_handle = os::native_java_library();
1076 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::dll_lookup(javalib_handle, "Canonicalize"));
1077 // This lookup only works on 1.3. Do not check for non-null here
1078 }
1079
1080 void ClassLoader::load_jimage_library() {
1081 // First make sure native library is loaded
1082 os::native_java_library();
1083 // Load jimage library
1084 char path[JVM_MAXPATHLEN];
1085 char ebuf[1024];
1086 void* handle = NULL;
1087 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1088 handle = os::dll_load(path, ebuf, sizeof ebuf);
1089 }
1090 if (handle == NULL) {
1091 vm_exit_during_initialization("Unable to load jimage library", path);
1092 }
1093
1094 // Lookup jimage entry points
1095 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::dll_lookup(handle, "JIMAGE_Open"));
1096 guarantee(JImageOpen != NULL, "function JIMAGE_Open not found");
1097 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::dll_lookup(handle, "JIMAGE_Close"));
1098 guarantee(JImageClose != NULL, "function JIMAGE_Close not found");
1099 JImagePackageToModule = CAST_TO_FN_PTR(JImagePackageToModule_t, os::dll_lookup(handle, "JIMAGE_PackageToModule"));
1100 guarantee(JImagePackageToModule != NULL, "function JIMAGE_PackageToModule not found");
1101 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::dll_lookup(handle, "JIMAGE_FindResource"));
1102 guarantee(JImageFindResource != NULL, "function JIMAGE_FindResource not found");
1103 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::dll_lookup(handle, "JIMAGE_GetResource"));
1104 guarantee(JImageGetResource != NULL, "function JIMAGE_GetResource not found");
1105 JImageResourceIterator = CAST_TO_FN_PTR(JImageResourceIterator_t, os::dll_lookup(handle, "JIMAGE_ResourceIterator"));
1106 guarantee(JImageResourceIterator != NULL, "function JIMAGE_ResourceIterator not found");
1107 }
1108
1109 jboolean ClassLoader::decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg) {
1110 return (*ZipInflateFully)(in, inSize, out, outSize, pmsg);
1111 }
1112
1113 int ClassLoader::crc32(int crc, const char* buf, int len) {
1114 assert(Crc32 != NULL, "ZIP_CRC32 is not found");
1115 return (*Crc32)(crc, (const jbyte*)buf, len);
1116 }
1117
1118 // Function add_package extracts the package from the fully qualified class name
1119 // and checks if the package is in the boot loader's package entry table. If so,
1120 // then it sets the classpath_index in the package entry record.
1121 //
1122 // The classpath_index field is used to find the entry on the boot loader class
1123 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
1124 // in an unnamed module. It is also used to indicate (for all packages whose
1125 // classes are loaded by the boot loader) that at least one of the package's
1126 // classes has been loaded.
1127 bool ClassLoader::add_package(const char *fullq_class_name, s2 classpath_index, TRAPS) {
1128 assert(fullq_class_name != NULL, "just checking");
1129
1130 // Get package name from fully qualified class name.
1131 ResourceMark rm;
1132 const char *cp = package_from_name(fullq_class_name);
1133 if (cp != NULL) {
1134 PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();
1135 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(cp);
1136 PackageEntry* pkg_entry = pkg_entry_tbl->lookup_only(pkg_symbol);
1137 if (pkg_entry != NULL) {
1138 assert(classpath_index != -1, "Unexpected classpath_index");
1139 pkg_entry->set_classpath_index(classpath_index);
1140 } else {
1141 return false;
1142 }
1143 }
1144 return true;
1145 }
1146
1147 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1148 // Look up the name in the boot loader's package entry table.
1149 if (name != NULL) {
1150 TempNewSymbol package_sym = SymbolTable::new_symbol(name);
1151 // Look for the package entry in the boot loader's package entry table.
1152 PackageEntry* package =
1153 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1154
1155 // Return NULL if package does not exist or if no classes in that package
1156 // have been loaded.
1157 if (package != NULL && package->has_loaded_class()) {
1158 ModuleEntry* module = package->module();
1159 if (module->location() != NULL) {
1160 ResourceMark rm(THREAD);
1161 Handle ml = java_lang_String::create_from_str(
1162 module->location()->as_C_string(), THREAD);
1163 return ml();
1164 }
1165 // Return entry on boot loader class path.
1166 Handle cph = java_lang_String::create_from_str(
1167 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1168 return cph();
1169 }
1170 }
1171 return NULL;
1172 }
1173
1174 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1175 ResourceMark rm(THREAD);
1176 // List of pointers to PackageEntrys that have loaded classes.
1177 GrowableArray<PackageEntry*>* loaded_class_pkgs = new GrowableArray<PackageEntry*>(50);
1178 {
1179 MutexLocker ml(Module_lock, THREAD);
1180
1181 PackageEntryTable* pe_table =
1182 ClassLoaderData::the_null_class_loader_data()->packages();
1183
1184 // Collect the packages that have at least one loaded class.
1185 for (int x = 0; x < pe_table->table_size(); x++) {
1186 for (PackageEntry* package_entry = pe_table->bucket(x);
1187 package_entry != NULL;
1188 package_entry = package_entry->next()) {
1189 if (package_entry->has_loaded_class()) {
1190 loaded_class_pkgs->append(package_entry);
1191 }
1192 }
1193 }
1194 }
1195
1196
1197 // Allocate objArray and fill with java.lang.String
1198 objArrayOop r = oopFactory::new_objArray(SystemDictionary::String_klass(),
1199 loaded_class_pkgs->length(), CHECK_NULL);
1200 objArrayHandle result(THREAD, r);
1201 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1202 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1203 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1204 result->obj_at_put(x, str());
1205 }
1206 return result();
1207 }
1208
1209 // caller needs ResourceMark
1210 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1211 int class_name_len) {
1212 assert(class_name != NULL, "invariant");
1213 assert((int)strlen(class_name) == class_name_len, "invariant");
1214
1215 static const char class_suffix[] = ".class";
1216 size_t class_suffix_len = sizeof(class_suffix);
1217
1218 char* const file_name = NEW_RESOURCE_ARRAY(char,
1219 class_name_len +
1220 class_suffix_len); // includes term NULL
1221
1222 strncpy(file_name, class_name, class_name_len);
1223 strncpy(&file_name[class_name_len], class_suffix, class_suffix_len);
1224
1225 return file_name;
1226 }
1227
1228 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1229 const GrowableArray<ModuleClassPathList*>* const module_list) {
1230 int num_of_entries = module_list->length();
1231 const Symbol* class_module_name = mod_entry->name();
1232
1233 // Loop through all the modules in either the patch-module or exploded entries looking for module
1234 for (int i = 0; i < num_of_entries; i++) {
1235 ModuleClassPathList* module_cpl = module_list->at(i);
1236 Symbol* module_cpl_name = module_cpl->module_name();
1237
1238 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1239 // Class' module has been located.
1240 return module_cpl->module_first_entry();
1241 }
1242 }
1243 return NULL;
1244 }
1245
1246
1247 // Search either the patch-module or exploded build entries for class.
1248 ClassFileStream* ClassLoader::search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
1249 const char* const class_name,
1250 const char* const file_name,
1251 TRAPS) {
1252 ClassFileStream* stream = NULL;
1253
1254 // Find the class' defining module in the boot loader's module entry table
1255 PackageEntry* pkg_entry = get_package_entry(class_name, ClassLoaderData::the_null_class_loader_data(), CHECK_NULL);
1256 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1257
1258 // If the module system has not defined java.base yet, then
1259 // classes loaded are assumed to be defined to java.base.
1260 // When java.base is eventually defined by the module system,
1261 // all packages of classes that have been previously loaded
1262 // are verified in ModuleEntryTable::verify_javabase_packages().
1263 if (!Universe::is_module_initialized() &&
1264 !ModuleEntryTable::javabase_defined() &&
1265 mod_entry == NULL) {
1266 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1267 }
1268
1269 // The module must be a named module
1270 ClassPathEntry* e = NULL;
1271 if (mod_entry != NULL && mod_entry->is_named()) {
1272 if (module_list == _exploded_entries) {
1273 // The exploded build entries can be added to at any time so a lock is
1274 // needed when searching them.
1275 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1276 MutexLocker ml(Module_lock, THREAD);
1277 e = find_first_module_cpe(mod_entry, module_list);
1278 } else {
1279 e = find_first_module_cpe(mod_entry, module_list);
1280 }
1281 }
1282
1283 // Try to load the class from the module's ClassPathEntry list.
1284 while (e != NULL) {
1285 stream = e->open_stream(file_name, CHECK_NULL);
1286 // No context.check is required since CDS is not supported
1287 // for an exploded modules build or if --patch-module is specified.
1288 if (NULL != stream) {
1289 return stream;
1290 }
1291 e = e->next();
1292 }
1293 // If the module was located, break out even if the class was not
1294 // located successfully from that module's ClassPathEntry list.
1295 // There will not be another valid entry for that module.
1296 return NULL;
1297 }
1298
1299 // Called by the boot classloader to load classes
1300 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1301 assert(name != NULL, "invariant");
1302 assert(THREAD->is_Java_thread(), "must be a JavaThread");
1303
1304 ResourceMark rm(THREAD);
1305 HandleMark hm(THREAD);
1306
1307 const char* const class_name = name->as_C_string();
1308
1309 EventMark m("loading class %s", class_name);
1310
1311 const char* const file_name = file_name_for_class_name(class_name,
1312 name->utf8_length());
1313 assert(file_name != NULL, "invariant");
1314
1315 // Lookup stream for parsing .class file
1316 ClassFileStream* stream = NULL;
1317 s2 classpath_index = 0;
1318 ClassPathEntry* e = NULL;
1319
1320 // If search_append_only is true, boot loader visibility boundaries are
1321 // set to be _first_append_entry to the end. This includes:
1322 // [-Xbootclasspath/a]; [jvmti appended entries]
1323 //
1324 // If search_append_only is false, boot loader visibility boundaries are
1325 // set to be the --patch-module entries plus the base piece. This includes:
1326 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1327 //
1328
1329 // Load Attempt #1: --patch-module
1330 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1331 // attempt to load the class from those locations specific to the module.
1332 // Specifications to --patch-module can contain a partial number of classes
1333 // that are part of the overall module definition. So if a particular class is not
1334 // found within its module specification, the search should continue to Load Attempt #2.
1335 // Note: The --patch-module entries are never searched if the boot loader's
1336 // visibility boundary is limited to only searching the append entries.
1337 if (_patch_mod_entries != NULL && !search_append_only) {
1338 // At CDS dump time, the --patch-module entries are ignored. That means a
1339 // class is still loaded from the runtime image even if it might
1340 // appear in the _patch_mod_entries. The runtime shared class visibility
1341 // check will determine if a shared class is visible based on the runtime
1342 // environemnt, including the runtime --patch-module setting.
1343 //
1344 // DynamicDumpSharedSpaces requires UseSharedSpaces to be enabled. Since --patch-module
1345 // is not supported with UseSharedSpaces, it is not supported with DynamicDumpSharedSpaces.
1346 assert(!DynamicDumpSharedSpaces, "sanity");
1347 if (!DumpSharedSpaces) {
1348 stream = search_module_entries(_patch_mod_entries, class_name, file_name, CHECK_NULL);
1349 }
1350 }
1351
1352 // Load Attempt #2: [jimage | exploded build]
1353 if (!search_append_only && (NULL == stream)) {
1354 if (has_jrt_entry()) {
1355 e = _jrt_entry;
1356 stream = _jrt_entry->open_stream(file_name, CHECK_NULL);
1357 } else {
1358 // Exploded build - attempt to locate class in its defining module's location.
1359 assert(_exploded_entries != NULL, "No exploded build entries present");
1360 stream = search_module_entries(_exploded_entries, class_name, file_name, CHECK_NULL);
1361 }
1362 }
1363
1364 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1365 if (search_append_only && (NULL == stream)) {
1366 // For the boot loader append path search, the starting classpath_index
1367 // for the appended piece is always 1 to account for either the
1368 // _jrt_entry or the _exploded_entries.
1369 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1370 classpath_index = 1;
1371
1372 e = _first_append_entry;
1373 while (e != NULL) {
1374 stream = e->open_stream(file_name, CHECK_NULL);
1375 if (NULL != stream) {
1376 break;
1377 }
1378 e = e->next();
1379 ++classpath_index;
1380 }
1381 }
1382
1383 if (NULL == stream) {
1384 return NULL;
1385 }
1386
1387 stream->set_verify(ClassLoaderExt::should_verify(classpath_index));
1388
1389 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1390 Handle protection_domain;
1391
1392 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1393 name,
1394 loader_data,
1395 protection_domain,
1396 NULL, // unsafe_anonymous_host
1397 NULL, // cp_patches
1398 THREAD);
1399 if (HAS_PENDING_EXCEPTION) {
1400 if (DumpSharedSpaces) {
1401 tty->print_cr("Preload Error: Failed to load %s", class_name);
1402 }
1403 return NULL;
1404 }
1405
1406 if (!add_package(file_name, classpath_index, THREAD)) {
1407 return NULL;
1408 }
1409
1410 return result;
1411 }
1412
1413 #if INCLUDE_CDS
1414 char* ClassLoader::skip_uri_protocol(char* source) {
1415 if (strncmp(source, "file:", 5) == 0) {
1416 // file: protocol path could start with file:/ or file:///
1417 // locate the char after all the forward slashes
1418 int offset = 5;
1419 while (*(source + offset) == '/') {
1420 offset++;
1421 }
1422 source += offset;
1423 // for non-windows platforms, move back one char as the path begins with a '/'
1424 #ifndef _WINDOWS
1425 source -= 1;
1426 #endif
1427 } else if (strncmp(source, "jrt:/", 5) == 0) {
1428 source += 5;
1429 }
1430 return source;
1431 }
1432
1433 // Record the shared classpath index and loader type for classes loaded
1434 // by the builtin loaders at dump time.
1435 void ClassLoader::record_result(InstanceKlass* ik, const ClassFileStream* stream, TRAPS) {
1436 assert(DumpSharedSpaces || DynamicDumpSharedSpaces, "sanity");
1437 assert(stream != NULL, "sanity");
1438
1439 if (ik->is_unsafe_anonymous()) {
1440 // We do not archive unsafe anonymous classes.
1441 return;
1442 }
1443
1444 oop loader = ik->class_loader();
1445 char* src = (char*)stream->source();
1446 if (src == NULL) {
1447 if (loader == NULL) {
1448 // JFR classes
1449 ik->set_shared_classpath_index(0);
1450 ik->set_class_loader_type(ClassLoader::BOOT_LOADER);
1451 }
1452 return;
1453 }
1454
1455 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1456
1457 ResourceMark rm(THREAD);
1458 int classpath_index = -1;
1459 PackageEntry* pkg_entry = ik->package();
1460
1461 if (FileMapInfo::get_number_of_shared_paths() > 0) {
1462 char* canonical_path_table_entry = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
1463
1464 // save the path from the file: protocol or the module name from the jrt: protocol
1465 // if no protocol prefix is found, path is the same as stream->source()
1466 char* path = skip_uri_protocol(src);
1467 char* canonical_class_src_path = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, JVM_MAXPATHLEN);
1468 bool success = get_canonical_path(path, canonical_class_src_path, JVM_MAXPATHLEN);
1469 // The path is from the ClassFileStream. Since a ClassFileStream has been created successfully in functions
1470 // such as ClassLoader::load_class(), its source path must be valid.
1471 assert(success, "must be valid path");
1472 for (int i = 0; i < FileMapInfo::get_number_of_shared_paths(); i++) {
1473 SharedClassPathEntry* ent = FileMapInfo::shared_path(i);
1474 success = get_canonical_path(ent->name(), canonical_path_table_entry, JVM_MAXPATHLEN);
1475 // A shared path has been validated during its creation in ClassLoader::create_class_path_entry(),
1476 // it must be valid here.
1477 assert(success, "must be valid path");
1478 // If the path (from the class stream source) is the same as the shared
1479 // class or module path, then we have a match.
1480 if (strcmp(canonical_path_table_entry, canonical_class_src_path) == 0) {
1481 // NULL pkg_entry and pkg_entry in an unnamed module implies the class
1482 // is from the -cp or boot loader append path which consists of -Xbootclasspath/a
1483 // and jvmti appended entries.
1484 if ((pkg_entry == NULL) || (pkg_entry->in_unnamed_module())) {
1485 // Ensure the index is within the -cp range before assigning
1486 // to the classpath_index.
1487 if (SystemDictionary::is_system_class_loader(loader) &&
1488 (i >= ClassLoaderExt::app_class_paths_start_index()) &&
1489 (i < ClassLoaderExt::app_module_paths_start_index())) {
1490 classpath_index = i;
1491 break;
1492 } else {
1493 if ((i >= 1) &&
1494 (i < ClassLoaderExt::app_class_paths_start_index())) {
1495 // The class must be from boot loader append path which consists of
1496 // -Xbootclasspath/a and jvmti appended entries.
1497 assert(loader == NULL, "sanity");
1498 classpath_index = i;
1499 break;
1500 }
1501 }
1502 } else {
1503 // A class from a named module from the --module-path. Ensure the index is
1504 // within the --module-path range before assigning to the classpath_index.
1505 if ((pkg_entry != NULL) && !(pkg_entry->in_unnamed_module()) && (i > 0)) {
1506 if (i >= ClassLoaderExt::app_module_paths_start_index() &&
1507 i < FileMapInfo::get_number_of_shared_paths()) {
1508 classpath_index = i;
1509 break;
1510 }
1511 }
1512 }
1513 }
1514 // for index 0 and the stream->source() is the modules image or has the jrt: protocol.
1515 // The class must be from the runtime modules image.
1516 if (i == 0 && (stream->from_boot_loader_modules_image() || string_starts_with(src, "jrt:"))) {
1517 classpath_index = i;
1518 break;
1519 }
1520 }
1521
1522 // No path entry found for this class. Must be a shared class loaded by the
1523 // user defined classloader.
1524 if (classpath_index < 0) {
1525 assert(ik->shared_classpath_index() < 0, "Sanity");
1526 ik->set_shared_classpath_index(UNREGISTERED_INDEX);
1527 SystemDictionaryShared::set_shared_class_misc_info(ik, (ClassFileStream*)stream);
1528 return;
1529 }
1530 } else {
1531 // The shared path table is set up after module system initialization.
1532 // The path table contains no entry before that. Any classes loaded prior
1533 // to the setup of the shared path table must be from the modules image.
1534 assert(stream->from_boot_loader_modules_image(), "stream must be loaded by boot loader from modules image");
1535 assert(FileMapInfo::get_number_of_shared_paths() == 0, "shared path table must not have been setup");
1536 classpath_index = 0;
1537 }
1538
1539 const char* const class_name = ik->name()->as_C_string();
1540 const char* const file_name = file_name_for_class_name(class_name,
1541 ik->name()->utf8_length());
1542 assert(file_name != NULL, "invariant");
1543
1544 ClassLoaderExt::record_result(classpath_index, ik, THREAD);
1545 }
1546 #endif // INCLUDE_CDS
1547
1548 // Initialize the class loader's access to methods in libzip. Parse and
1549 // process the boot classpath into a list ClassPathEntry objects. Once
1550 // this list has been created, it must not change order (see class PackageInfo)
1551 // it can be appended to and is by jvmti and the kernel vm.
1552
1553 void ClassLoader::initialize() {
1554 EXCEPTION_MARK;
1555
1556 if (UsePerfData) {
1557 // jvmstat performance counters
1558 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1559 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1560 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1561 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1562 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1563 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1564 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1565 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1566 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1567 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1568
1569 NEWPERFTICKCOUNTER(_perf_class_parse_time, SUN_CLS, "parseClassTime");
1570 NEWPERFTICKCOUNTER(_perf_class_parse_selftime, SUN_CLS, "parseClassTime.self");
1571 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1572 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1573 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1574 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1575 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1576 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1577 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1578 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1579 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1580 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1581 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1582
1583
1584 // The following performance counters are added for measuring the impact
1585 // of the bug fix of 6365597. They are mainly focused on finding out
1586 // the behavior of system & user-defined classloader lock, whether
1587 // ClassLoader.loadClass/findClass is being called synchronized or not.
1588 NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
1589 "systemLoaderLockContentionRate");
1590 NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
1591 "nonSystemLoaderLockContentionRate");
1592 NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
1593 "jvmFindLoadedClassNoLockCalls");
1594 NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
1595 "jvmDefineClassNoLockCalls");
1596
1597 NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
1598 "jniDefineClassNoLockCalls");
1599
1600 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
1601 "unsafeDefineClassCalls");
1602 }
1603
1604 // lookup zip library entry points
1605 load_zip_library();
1606 // lookup jimage library entry points
1607 load_jimage_library();
1608 #if INCLUDE_CDS
1609 // initialize search path
1610 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
1611 _shared_paths_misc_info = new SharedPathsMiscInfo();
1612 }
1613 #endif
1614 setup_bootstrap_search_path();
1615 }
1616
1617 #if INCLUDE_CDS
1618 void ClassLoader::initialize_shared_path() {
1619 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
1620 ClassLoaderExt::setup_search_paths();
1621 _shared_paths_misc_info->write_jint(0); // see comments in SharedPathsMiscInfo::check()
1622 }
1623 }
1624
1625 void ClassLoader::initialize_module_path(TRAPS) {
1626 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
1627 ClassLoaderExt::setup_module_paths(THREAD);
1628 FileMapInfo::allocate_shared_path_table();
1629 }
1630 }
1631 #endif
1632
1633 jlong ClassLoader::classloader_time_ms() {
1634 return UsePerfData ?
1635 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1636 }
1637
1638 jlong ClassLoader::class_init_count() {
1639 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1640 }
1641
1642 jlong ClassLoader::class_init_time_ms() {
1643 return UsePerfData ?
1644 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1645 }
1646
1647 jlong ClassLoader::class_verify_time_ms() {
1648 return UsePerfData ?
1649 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1650 }
1651
1652 jlong ClassLoader::class_link_count() {
1653 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1654 }
1655
1656 jlong ClassLoader::class_link_time_ms() {
1657 return UsePerfData ?
1658 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1659 }
1660
1661 int ClassLoader::compute_Object_vtable() {
1662 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1663 // code to determine actual value from file
1664 // Would be value '11' if finals were in vtable
1665 int JDK_1_2_Object_vtable_size = 5;
1666 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1667 }
1668
1669
1670 void classLoader_init1() {
1671 ClassLoader::initialize();
1672 }
1673
1674 // Complete the ClassPathEntry setup for the boot loader
1675 void ClassLoader::classLoader_init2(TRAPS) {
1676 // Setup the list of module/path pairs for --patch-module processing
1677 // This must be done after the SymbolTable is created in order
1678 // to use fast_compare on module names instead of a string compare.
1679 if (Arguments::get_patch_mod_prefix() != NULL) {
1680 setup_patch_mod_entries();
1681 }
1682
1683 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1684 // to successfully determine if java.base has been patched)
1685 create_javabase();
1686
1687 // Setup the initial java.base/path pair for the exploded build entries.
1688 // As more modules are defined during module system initialization, more
1689 // entries will be added to the exploded build array.
1690 if (!has_jrt_entry()) {
1691 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1692 assert(!DynamicDumpSharedSpaces, "DynamicDumpSharedSpaces not supported with exploded module builds");
1693 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1694 // Set up the boot loader's _exploded_entries list. Note that this gets
1695 // done before loading any classes, by the same thread that will
1696 // subsequently do the first class load. So, no lock is needed for this.
1697 assert(_exploded_entries == NULL, "Should only get initialized once");
1698 _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1699 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, true);
1700 add_to_exploded_build_list(vmSymbols::java_base(), CHECK);
1701 }
1702 }
1703
1704
1705 bool ClassLoader::get_canonical_path(const char* orig, char* out, int len) {
1706 assert(orig != NULL && out != NULL && len > 0, "bad arguments");
1707 if (CanonicalizeEntry != NULL) {
1708 JavaThread* THREAD = JavaThread::current();
1709 JNIEnv* env = THREAD->jni_environment();
1710 ResourceMark rm(THREAD);
1711
1712 // os::native_path writes into orig_copy
1713 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, strlen(orig)+1);
1714 strcpy(orig_copy, orig);
1715 if ((CanonicalizeEntry)(env, os::native_path(orig_copy), out, len) < 0) {
1716 return false;
1717 }
1718 } else {
1719 // On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
1720 strncpy(out, orig, len);
1721 out[len - 1] = '\0';
1722 }
1723 return true;
1724 }
1725
1726 void ClassLoader::create_javabase() {
1727 Thread* THREAD = Thread::current();
1728
1729 // Create java.base's module entry for the boot
1730 // class loader prior to loading j.l.Ojbect.
1731 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1732
1733 // Get module entry table
1734 ModuleEntryTable* null_cld_modules = null_cld->modules();
1735 if (null_cld_modules == NULL) {
1736 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1737 }
1738
1739 {
1740 MutexLocker ml(Module_lock, THREAD);
1741 ModuleEntry* jb_module = null_cld_modules->locked_create_entry(Handle(),
1742 false, vmSymbols::java_base(), NULL, NULL, null_cld);
1743 if (jb_module == NULL) {
1744 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1745 }
1746 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1747 }
1748 }
1749
1750 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1751 // they could get inlined by agressive compiler, an unknown trick, see bug 6966589.
1752 void PerfClassTraceTime::initialize() {
1753 if (!UsePerfData) return;
1754
1755 if (_eventp != NULL) {
1756 // increment the event counter
1757 _eventp->inc();
1758 }
1759
1760 // stop the current active thread-local timer to measure inclusive time
1761 _prev_active_event = -1;
1762 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1763 if (_timers[i].is_active()) {
1764 assert(_prev_active_event == -1, "should have only one active timer");
1765 _prev_active_event = i;
1766 _timers[i].stop();
1767 }
1768 }
1769
1770 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1771 // start the inclusive timer if not recursively called
1772 _t.start();
1773 }
1774
1775 // start thread-local timer of the given event type
1776 if (!_timers[_event_type].is_active()) {
1777 _timers[_event_type].start();
1778 }
1779 }
1780
1781 PerfClassTraceTime::~PerfClassTraceTime() {
1782 if (!UsePerfData) return;
1783
1784 // stop the thread-local timer as the event completes
1785 // and resume the thread-local timer of the event next on the stack
1786 _timers[_event_type].stop();
1787 jlong selftime = _timers[_event_type].ticks();
1788
1789 if (_prev_active_event >= 0) {
1790 _timers[_prev_active_event].start();
1791 }
1792
1793 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1794
1795 // increment the counters only on the leaf call
1796 _t.stop();
1797 _timep->inc(_t.ticks());
1798 if (_selftimep != NULL) {
1799 _selftimep->inc(selftime);
1800 }
1801 // add all class loading related event selftime to the accumulated time counter
1802 ClassLoader::perf_accumulated_time()->inc(selftime);
1803
1804 // reset the timer
1805 _timers[_event_type].reset();
1806 }