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