1 /*
2 * Copyright (c) 1997, 2024, 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 "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/filemap.hpp"
29 #include "cds/heapShared.hpp"
30 #include "classfile/classFileStream.hpp"
31 #include "classfile/classLoader.inline.hpp"
32 #include "classfile/classLoaderData.inline.hpp"
33 #include "classfile/classLoaderExt.hpp"
34 #include "classfile/classLoadInfo.hpp"
35 #include "classfile/javaClasses.hpp"
36 #include "classfile/klassFactory.hpp"
37 #include "classfile/moduleEntry.hpp"
38 #include "classfile/modules.hpp"
39 #include "classfile/packageEntry.hpp"
40 #include "classfile/symbolTable.hpp"
41 #include "classfile/systemDictionary.hpp"
42 #include "classfile/systemDictionaryShared.hpp"
43 #include "classfile/vmClasses.hpp"
44 #include "classfile/vmSymbols.hpp"
45 #include "compiler/compileBroker.hpp"
46 #include "interpreter/bytecodeStream.hpp"
47 #include "interpreter/oopMapCache.hpp"
48 #include "jimage.hpp"
49 #include "jvm.h"
50 #include "logging/log.hpp"
51 #include "logging/logStream.hpp"
52 #include "logging/logTag.hpp"
53 #include "memory/allocation.inline.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/resourceArea.hpp"
56 #include "memory/universe.hpp"
57 #include "oops/instanceKlass.hpp"
58 #include "oops/instanceRefKlass.hpp"
59 #include "oops/klass.inline.hpp"
60 #include "oops/method.inline.hpp"
61 #include "oops/objArrayOop.inline.hpp"
62 #include "oops/oop.inline.hpp"
63 #include "oops/symbol.hpp"
64 #include "prims/jvm_misc.hpp"
65 #include "runtime/arguments.hpp"
66 #include "runtime/handles.inline.hpp"
67 #include "runtime/init.hpp"
68 #include "runtime/interfaceSupport.inline.hpp"
69 #include "runtime/java.hpp"
70 #include "runtime/javaCalls.hpp"
71 #include "runtime/os.hpp"
72 #include "runtime/perfData.inline.hpp"
73 #include "runtime/threadCritical.hpp"
74 #include "runtime/timer.hpp"
75 #include "runtime/vm_version.hpp"
76 #include "services/management.hpp"
77 #include "services/threadService.hpp"
78 #include "utilities/checkedCast.hpp"
79 #include "utilities/classpathStream.hpp"
80 #include "utilities/events.hpp"
81 #include "utilities/macros.hpp"
82 #include "utilities/ostream.hpp"
83 #include "utilities/utf8.hpp"
84
85 #include <stdlib.h>
86 #include <ctype.h>
87
88 // Entry point in java.dll for path canonicalization
89
90 typedef int (*canonicalize_fn_t)(const char *orig, char *out, int len);
91
92 static canonicalize_fn_t CanonicalizeEntry = nullptr;
93
94 // Entry points for jimage.dll for loading jimage file entries
95
96 static JImageOpen_t JImageOpen = nullptr;
97 static JImageClose_t JImageClose = nullptr;
98 static JImageFindResource_t JImageFindResource = nullptr;
99 static JImageGetResource_t JImageGetResource = nullptr;
100
101 // JimageFile pointer, or null if exploded JDK build.
102 static JImageFile* JImage_file = nullptr;
103
104 // Globals
105
106 PerfCounter* ClassLoader::_perf_accumulated_time = nullptr;
107 PerfCounter* ClassLoader::_perf_classes_inited = nullptr;
108 PerfCounter* ClassLoader::_perf_class_init_time = nullptr;
109 PerfCounter* ClassLoader::_perf_class_init_selftime = nullptr;
110 PerfCounter* ClassLoader::_perf_class_init_bytecodes_count = nullptr;
111 PerfCounter* ClassLoader::_perf_classes_verified = nullptr;
112 PerfCounter* ClassLoader::_perf_class_verify_time = nullptr;
113 PerfCounter* ClassLoader::_perf_class_verify_selftime = nullptr;
114 PerfCounter* ClassLoader::_perf_classes_linked = nullptr;
115 PerfCounter* ClassLoader::_perf_class_link_time = nullptr;
116 PerfCounter* ClassLoader::_perf_class_link_selftime = nullptr;
117 PerfCounter* ClassLoader::_perf_shared_classload_time = nullptr;
118 PerfCounter* ClassLoader::_perf_sys_classload_time = nullptr;
119 PerfCounter* ClassLoader::_perf_app_classload_time = nullptr;
120 PerfCounter* ClassLoader::_perf_app_classload_selftime = nullptr;
121 PerfCounter* ClassLoader::_perf_app_classload_count = nullptr;
122 PerfCounter* ClassLoader::_perf_define_appclasses = nullptr;
123 PerfCounter* ClassLoader::_perf_define_appclass_time = nullptr;
124 PerfCounter* ClassLoader::_perf_define_appclass_selftime = nullptr;
125 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = nullptr;
126 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = nullptr;
127 PerfCounter* ClassLoader::_perf_preload_total_time = nullptr;
128 PerfCounter* ClassLoader::_perf_preload_time = nullptr;
129 PerfCounter* ClassLoader::_perf_prelink_time = nullptr;
130 PerfCounter* ClassLoader::_perf_preinit_time = nullptr;
131 PerfCounter* ClassLoader::_perf_preresolve_time = nullptr;
132 PerfCounter* ClassLoader::_perf_ik_link_methods_time = nullptr;
133 PerfCounter* ClassLoader::_perf_method_adapters_time = nullptr;
134 PerfCounter* ClassLoader::_perf_ik_link_methods_count = nullptr;
135 PerfCounter* ClassLoader::_perf_method_adapters_count = nullptr;
136 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = nullptr;
137 PerfCounter* ClassLoader::_perf_secondary_hash_time = nullptr;
138
139 PerfTickCounters* ClassLoader::_perf_resolve_indy_time = nullptr;
140 PerfTickCounters* ClassLoader::_perf_resolve_invokehandle_time = nullptr;
141 PerfTickCounters* ClassLoader::_perf_resolve_mh_time = nullptr;
142 PerfTickCounters* ClassLoader::_perf_resolve_mt_time = nullptr;
143
144 PerfCounter* ClassLoader::_perf_resolve_indy_count = nullptr;
145 PerfCounter* ClassLoader::_perf_resolve_invokehandle_count = nullptr;
146 PerfCounter* ClassLoader::_perf_resolve_mh_count = nullptr;
147 PerfCounter* ClassLoader::_perf_resolve_mt_count = nullptr;
148
149 void ClassLoader::print_counters(outputStream *st) {
150 st->print_cr("ClassLoader:");
151 st->print_cr( " clinit: " JLONG_FORMAT_W(6) "us / " JLONG_FORMAT " events",
152 ClassLoader::class_init_time_ms(), ClassLoader::class_init_count());
153 st->print_cr(" link methods: " JLONG_FORMAT_W(6) "us / " JLONG_FORMAT " events",
154 Management::ticks_to_us(_perf_ik_link_methods_time->get_value()) , _perf_ik_link_methods_count->get_value());
155 st->print_cr(" method adapters: " JLONG_FORMAT_W(6) "us / " JLONG_FORMAT " events",
156 Management::ticks_to_us(_perf_method_adapters_time->get_value()) , _perf_method_adapters_count->get_value());
157 if (CountBytecodes || CountBytecodesPerThread) {
158 st->print_cr("; executed " JLONG_FORMAT " bytecodes", ClassLoader::class_init_bytecodes_count());
159 }
160 st->print_cr(" resolve...");
161 st->print_cr(" invokedynamic: " JLONG_FORMAT_W(6) "us (elapsed) " JLONG_FORMAT_W(6) "us (thread) / " JLONG_FORMAT_W(5) " events",
162 _perf_resolve_indy_time->elapsed_counter_value_us(),
163 _perf_resolve_indy_time->thread_counter_value_us(),
164 _perf_resolve_indy_count->get_value());
165 st->print_cr(" invokehandle: " JLONG_FORMAT_W(6) "us (elapsed) " JLONG_FORMAT_W(6) "us (thread) / " JLONG_FORMAT_W(5) " events",
166 _perf_resolve_invokehandle_time->elapsed_counter_value_us(),
167 _perf_resolve_invokehandle_time->thread_counter_value_us(),
168 _perf_resolve_invokehandle_count->get_value());
169 st->print_cr(" CP_MethodHandle: " JLONG_FORMAT_W(6) "us (elapsed) " JLONG_FORMAT_W(6) "us (thread) / " JLONG_FORMAT_W(5) " events",
170 _perf_resolve_mh_time->elapsed_counter_value_us(),
171 _perf_resolve_mh_time->thread_counter_value_us(),
172 _perf_resolve_mh_count->get_value());
173 st->print_cr(" CP_MethodType: " JLONG_FORMAT_W(6) "us (elapsed) " JLONG_FORMAT_W(6) "us (thread) / " JLONG_FORMAT_W(5) " events",
174 _perf_resolve_mt_time->elapsed_counter_value_us(),
175 _perf_resolve_mt_time->thread_counter_value_us(),
176 _perf_resolve_mt_count->get_value());
177 }
178
179 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = nullptr;
180 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = nullptr;
181 ClassPathEntry* ClassLoader::_jrt_entry = nullptr;
182
183 ClassPathEntry* volatile ClassLoader::_first_append_entry_list = nullptr;
184 ClassPathEntry* volatile ClassLoader::_last_append_entry = nullptr;
185 #if INCLUDE_CDS
186 ClassPathEntry* ClassLoader::_app_classpath_entries = nullptr;
187 ClassPathEntry* ClassLoader::_last_app_classpath_entry = nullptr;
188 ClassPathEntry* ClassLoader::_module_path_entries = nullptr;
189 ClassPathEntry* ClassLoader::_last_module_path_entry = nullptr;
190 #endif
191
192 // helper routines
193 #if INCLUDE_CDS
194 static bool string_starts_with(const char* str, const char* str_to_find) {
195 size_t str_len = strlen(str);
196 size_t str_to_find_len = strlen(str_to_find);
197 if (str_to_find_len > str_len) {
198 return false;
199 }
200 return (strncmp(str, str_to_find, str_to_find_len) == 0);
201 }
202 #endif
203
204 static const char* get_jimage_version_string() {
205 static char version_string[10] = "";
206 if (version_string[0] == '\0') {
207 jio_snprintf(version_string, sizeof(version_string), "%d.%d",
208 VM_Version::vm_major_version(), VM_Version::vm_minor_version());
209 }
210 return (const char*)version_string;
211 }
212
213 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
214 size_t str_len = strlen(str);
215 size_t str_to_find_len = strlen(str_to_find);
216 if (str_to_find_len > str_len) {
217 return false;
218 }
219 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
220 }
221
222 // Used to obtain the package name from a fully qualified class name.
223 Symbol* ClassLoader::package_from_class_name(const Symbol* name, bool* bad_class_name) {
224 if (name == nullptr) {
225 if (bad_class_name != nullptr) {
226 *bad_class_name = true;
227 }
228 return nullptr;
229 }
230
231 int utf_len = name->utf8_length();
232 const jbyte* base = (const jbyte*)name->base();
233 const jbyte* start = base;
234 const jbyte* end = UTF8::strrchr(start, utf_len, JVM_SIGNATURE_SLASH);
235 if (end == nullptr) {
236 return nullptr;
237 }
238 // Skip over '['s
239 if (*start == JVM_SIGNATURE_ARRAY) {
240 do {
241 start++;
242 } while (start < end && *start == JVM_SIGNATURE_ARRAY);
243
244 // Fully qualified class names should not contain a 'L'.
245 // Set bad_class_name to true to indicate that the package name
246 // could not be obtained due to an error condition.
247 // In this situation, is_same_class_package returns false.
248 if (*start == JVM_SIGNATURE_CLASS) {
249 if (bad_class_name != nullptr) {
250 *bad_class_name = true;
251 }
252 return nullptr;
253 }
254 }
255 // A class name could have just the slash character in the name,
256 // in which case start > end
257 if (start >= end) {
258 // No package name
259 if (bad_class_name != nullptr) {
260 *bad_class_name = true;
261 }
262 return nullptr;
263 }
264 return SymbolTable::new_symbol(name, pointer_delta_as_int(start, base), pointer_delta_as_int(end, base));
265 }
266
267 // Given a fully qualified package name, find its defining package in the class loader's
268 // package entry table.
269 PackageEntry* ClassLoader::get_package_entry(Symbol* pkg_name, ClassLoaderData* loader_data) {
270 if (pkg_name == nullptr) {
271 return nullptr;
272 }
273 PackageEntryTable* pkgEntryTable = loader_data->packages();
274 return pkgEntryTable->lookup_only(pkg_name);
275 }
276
277 const char* ClassPathEntry::copy_path(const char* path) {
278 char* copy = NEW_C_HEAP_ARRAY(char, strlen(path)+1, mtClass);
279 strcpy(copy, path);
280 return copy;
281 }
282
283 ClassPathDirEntry::~ClassPathDirEntry() {
284 FREE_C_HEAP_ARRAY(char, _dir);
285 }
286
287 ClassFileStream* ClassPathDirEntry::open_stream(JavaThread* current, const char* name) {
288 // construct full path name
289 assert((_dir != nullptr) && (name != nullptr), "sanity");
290 size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1;
291 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(current, char, path_len);
292 int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name);
293 assert(len == (int)(path_len - 1), "sanity");
294 // check if file exists
295 struct stat st;
296 if (os::stat(path, &st) == 0) {
297 // found file, open it
298 int file_handle = os::open(path, 0, 0);
299 if (file_handle != -1) {
300 // read contents into resource array
301 u1* buffer = NEW_RESOURCE_ARRAY_IN_THREAD(current, u1, st.st_size);
302 size_t num_read = ::read(file_handle, (char*) buffer, st.st_size);
303 // close file
304 ::close(file_handle);
305 // construct ClassFileStream
306 if (num_read == (size_t)st.st_size) {
307 if (UsePerfData) {
308 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
309 }
310 #ifdef ASSERT
311 // Freeing path is a no-op here as buffer prevents it from being reclaimed. But we keep it for
312 // debug builds so that we guard against use-after-free bugs.
313 FREE_RESOURCE_ARRAY_IN_THREAD(current, char, path, path_len);
314 #endif
315 // We don't verify the length of the classfile stream fits in an int, but this is the
316 // bootloader so we have control of this.
317 // Resource allocated
318 return new ClassFileStream(buffer,
319 checked_cast<int>(st.st_size),
320 _dir);
321 }
322 }
323 }
324 FREE_RESOURCE_ARRAY_IN_THREAD(current, char, path, path_len);
325 return nullptr;
326 }
327
328 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name,
329 bool from_class_path_attr) : ClassPathEntry() {
330 _zip = zip;
331 _zip_name = copy_path(zip_name);
332 _from_class_path_attr = from_class_path_attr;
333 }
334
335 ClassPathZipEntry::~ClassPathZipEntry() {
336 ZipLibrary::close(_zip);
337 FREE_C_HEAP_ARRAY(char, _zip_name);
338 }
339
340 bool ClassPathZipEntry::has_entry(JavaThread* current, const char* name) {
341 ThreadToNativeFromVM ttn(current);
342 // check whether zip archive contains name
343 jint name_len;
344 jint filesize;
345 jzentry* entry = ZipLibrary::find_entry(_zip, name, &filesize, &name_len);
346 if (entry == nullptr) {
347 return false;
348 } else {
349 ZipLibrary::free_entry(_zip, entry);
350 return true;
351 }
352 }
353
354 u1* ClassPathZipEntry::open_entry(JavaThread* current, const char* name, jint* filesize, bool nul_terminate) {
355 // enable call to C land
356 ThreadToNativeFromVM ttn(current);
357 // check whether zip archive contains name
358 jint name_len;
359 jzentry* entry = ZipLibrary::find_entry(_zip, name, filesize, &name_len);
360 if (entry == nullptr) return nullptr;
361 u1* buffer;
362 char name_buf[128];
363 char* filename;
364 if (name_len < 128) {
365 filename = name_buf;
366 } else {
367 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
368 }
369
370 // read contents into resource array
371 size_t size = (uint32_t)(*filesize);
372 if (nul_terminate) {
373 if (sizeof(size) == sizeof(uint32_t) && size == UINT_MAX) {
374 return nullptr; // 32-bit integer overflow will occur.
375 }
376 size++;
377 }
378
379 // ZIP_ReadEntry also frees zentry
380 buffer = NEW_RESOURCE_ARRAY(u1, size);
381 if (!ZipLibrary::read_entry(_zip, entry, buffer, filename)) {
382 return nullptr;
383 }
384
385 // return result
386 if (nul_terminate) {
387 buffer[size - 1] = 0;
388 }
389 return buffer;
390 }
391
392 ClassFileStream* ClassPathZipEntry::open_stream(JavaThread* current, const char* name) {
393 jint filesize;
394 u1* buffer = open_entry(current, name, &filesize, false);
395 if (buffer == nullptr) {
396 return nullptr;
397 }
398 if (UsePerfData) {
399 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
400 }
401 // Resource allocated
402 return new ClassFileStream(buffer,
403 filesize,
404 _zip_name);
405 }
406
407 DEBUG_ONLY(ClassPathImageEntry* ClassPathImageEntry::_singleton = nullptr;)
408
409 JImageFile* ClassPathImageEntry::jimage() const {
410 return JImage_file;
411 }
412
413 JImageFile* ClassPathImageEntry::jimage_non_null() const {
414 assert(ClassLoader::has_jrt_entry(), "must be");
415 assert(jimage() != nullptr, "should have been opened by ClassLoader::lookup_vm_options "
416 "and remained throughout normal JVM lifetime");
417 return jimage();
418 }
419
420 void ClassPathImageEntry::close_jimage() {
421 if (jimage() != nullptr) {
422 (*JImageClose)(jimage());
423 JImage_file = nullptr;
424 }
425 }
426
427 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
428 ClassPathEntry() {
429 guarantee(jimage != nullptr, "jimage file is null");
430 guarantee(name != nullptr, "jimage file name is null");
431 assert(_singleton == nullptr, "VM supports only one jimage");
432 DEBUG_ONLY(_singleton = this);
433 size_t len = strlen(name) + 1;
434 _name = copy_path(name);
435 }
436
437 ClassFileStream* ClassPathImageEntry::open_stream(JavaThread* current, const char* name) {
438 return open_stream_for_loader(current, name, ClassLoaderData::the_null_class_loader_data());
439 }
440
441 // For a class in a named module, look it up in the jimage file using this syntax:
442 // /<module-name>/<package-name>/<base-class>
443 //
444 // Assumptions:
445 // 1. There are no unnamed modules in the jimage file.
446 // 2. A package is in at most one module in the jimage file.
447 //
448 ClassFileStream* ClassPathImageEntry::open_stream_for_loader(JavaThread* current, const char* name, ClassLoaderData* loader_data) {
449 jlong size;
450 JImageLocationRef location = (*JImageFindResource)(jimage_non_null(), "", get_jimage_version_string(), name, &size);
451
452 if (location == 0) {
453 TempNewSymbol class_name = SymbolTable::new_symbol(name);
454 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name);
455
456 if (pkg_name != nullptr) {
457 if (!Universe::is_module_initialized()) {
458 location = (*JImageFindResource)(jimage_non_null(), JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
459 } else {
460 PackageEntry* package_entry = ClassLoader::get_package_entry(pkg_name, loader_data);
461 if (package_entry != nullptr) {
462 ResourceMark rm(current);
463 // Get the module name
464 ModuleEntry* module = package_entry->module();
465 assert(module != nullptr, "Boot classLoader package missing module");
466 assert(module->is_named(), "Boot classLoader package is in unnamed module");
467 const char* module_name = module->name()->as_C_string();
468 if (module_name != nullptr) {
469 location = (*JImageFindResource)(jimage_non_null(), module_name, get_jimage_version_string(), name, &size);
470 }
471 }
472 }
473 }
474 }
475 if (location != 0) {
476 if (UsePerfData) {
477 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
478 }
479 char* data = NEW_RESOURCE_ARRAY(char, size);
480 (*JImageGetResource)(jimage_non_null(), location, data, size);
481 // Resource allocated
482 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be");
483 return new ClassFileStream((u1*)data,
484 checked_cast<int>(size),
485 _name,
486 true); // from_boot_loader_modules_image
487 }
488
489 return nullptr;
490 }
491
492 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
493 const char* module_name,
494 const char* file_name,
495 jlong &size) {
496 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
497 }
498
499 bool ClassPathImageEntry::is_modules_image() const {
500 assert(this == _singleton, "VM supports a single jimage");
501 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be used for jrt entry");
502 return true;
503 }
504
505 #if INCLUDE_CDS
506 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
507 assert(CDSConfig::is_dumping_archive(), "sanity");
508 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
509 vm_exit_during_cds_dumping(error, message);
510 }
511 #endif
512
513 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
514 _module_name = module_name;
515 _module_first_entry = nullptr;
516 _module_last_entry = nullptr;
517 }
518
519 ModuleClassPathList::~ModuleClassPathList() {
520 // Clean out each ClassPathEntry on list
521 ClassPathEntry* e = _module_first_entry;
522 while (e != nullptr) {
523 ClassPathEntry* next_entry = e->next();
524 delete e;
525 e = next_entry;
526 }
527 }
528
529 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
530 if (new_entry != nullptr) {
531 if (_module_last_entry == nullptr) {
532 _module_first_entry = _module_last_entry = new_entry;
533 } else {
534 _module_last_entry->set_next(new_entry);
535 _module_last_entry = new_entry;
536 }
537 }
538 }
539
540 void ClassLoader::trace_class_path(const char* msg, const char* name) {
541 LogTarget(Info, class, path) lt;
542 if (lt.is_enabled()) {
543 LogStream ls(lt);
544 if (msg) {
545 ls.print("%s", msg);
546 }
547 if (name) {
548 if (strlen(name) < 256) {
549 ls.print("%s", name);
550 } else {
551 // For very long paths, we need to print each character separately,
552 // as print_cr() has a length limit
553 while (name[0] != '\0') {
554 ls.print("%c", name[0]);
555 name++;
556 }
557 }
558 }
559 ls.cr();
560 }
561 }
562
563 void ClassLoader::setup_bootstrap_search_path(JavaThread* current) {
564 const char* bootcp = Arguments::get_boot_class_path();
565 assert(bootcp != nullptr, "Boot class path must not be nullptr");
566 if (PrintSharedArchiveAndExit) {
567 // Don't print bootcp - this is the bootcp of this current VM process, not necessarily
568 // the same as the boot classpath of the shared archive.
569 } else {
570 trace_class_path("bootstrap loader class path=", bootcp);
571 }
572 setup_bootstrap_search_path_impl(current, bootcp);
573 }
574
575 #if INCLUDE_CDS
576 void ClassLoader::setup_app_search_path(JavaThread* current, const char *class_path) {
577 assert(CDSConfig::is_dumping_archive(), "sanity");
578
579 ResourceMark rm(current);
580 ClasspathStream cp_stream(class_path);
581
582 int exclusion_start_index = INT_MAX;
583 size_t limit = SIZE_MAX;
584 if (CacheOnlyClassesIn != nullptr) {
585 char* appclasspath = Arguments::get_appclasspath();
586 bool bad = false;
587 if (strstr(appclasspath, CacheOnlyClassesIn) != appclasspath) {
588 bad = true;
589 } else {
590 limit = strlen(CacheOnlyClassesIn);
591 if (limit > 0 && limit < strlen(appclasspath)
592 && CacheOnlyClassesIn[limit-1] != os::path_separator()[0]
593 && appclasspath[limit] != os::path_separator()[0]) {
594 bad = true;
595 }
596 }
597 if (bad) {
598 vm_exit_during_initialization(err_msg("CacheOnlyClassesIn \"%s\" must be a proper prefix of the CLASSPATH \"%s\"",
599 CacheOnlyClassesIn, appclasspath));
600 }
601 }
602
603 while (cp_stream.has_next()) {
604 if (cp_stream.num_chars_consumed() >= limit && exclusion_start_index == INT_MAX) {
605 exclusion_start_index = num_boot_classpath_entries() + num_app_classpath_entries();
606 }
607 const char* path = cp_stream.get_next();
608 update_class_path_entry_list(current, path, /* check_for_duplicates */ true,
609 /* is_boot_append */ false, /* from_class_path_attr */ false);
610 }
611
612 ClassLoaderExt::set_app_class_exclusion_start_path_index(exclusion_start_index);
613 if (exclusion_start_index != INT_MAX) {
614 log_info(cds)("Exclude all app classes whose shared_classpath_index is greater than %d", exclusion_start_index);
615 }
616 }
617
618 void ClassLoader::add_to_module_path_entries(const char* path,
619 ClassPathEntry* entry) {
620 assert(entry != nullptr, "ClassPathEntry should not be nullptr");
621 assert(CDSConfig::is_dumping_archive(), "sanity");
622
623 // The entry does not exist, add to the list
624 if (_module_path_entries == nullptr) {
625 assert(_last_module_path_entry == nullptr, "Sanity");
626 _module_path_entries = _last_module_path_entry = entry;
627 } else {
628 _last_module_path_entry->set_next(entry);
629 _last_module_path_entry = entry;
630 }
631 }
632
633 // Add a module path to the _module_path_entries list.
634 void ClassLoader::setup_module_search_path(JavaThread* current, const char* path) {
635 assert(CDSConfig::is_dumping_archive(), "sanity");
636 struct stat st;
637 if (os::stat(path, &st) != 0) {
638 tty->print_cr("os::stat error %d (%s). CDS dump aborted (path was \"%s\").",
639 errno, os::errno_name(errno), path);
640 vm_exit_during_initialization();
641 }
642 // File or directory found
643 ClassPathEntry* new_entry = nullptr;
644 new_entry = create_class_path_entry(current, path, &st,
645 false /*is_boot_append */, false /* from_class_path_attr */);
646 if (new_entry != nullptr) {
647 // ClassLoaderExt::process_module_table() filters out non-jar entries before calling this function.
648 assert(new_entry->is_jar_file(), "module path entry %s is not a jar file", new_entry->name());
649 add_to_module_path_entries(path, new_entry);
650 }
651 }
652
653 #endif // INCLUDE_CDS
654
655 void ClassLoader::close_jrt_image() {
656 // Not applicable for exploded builds
657 if (!ClassLoader::has_jrt_entry()) return;
658 _jrt_entry->close_jimage();
659 }
660
661 // Construct the array of module/path pairs as specified to --patch-module
662 // for the boot loader to search ahead of the jimage, if the class being
663 // loaded is defined to a module that has been specified to --patch-module.
664 void ClassLoader::setup_patch_mod_entries() {
665 JavaThread* current = JavaThread::current();
666 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
667 int num_of_entries = patch_mod_args->length();
668
669 // Set up the boot loader's _patch_mod_entries list
670 _patch_mod_entries = new (mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, mtModule);
671
672 for (int i = 0; i < num_of_entries; i++) {
673 const char* module_name = (patch_mod_args->at(i))->module_name();
674 Symbol* const module_sym = SymbolTable::new_symbol(module_name);
675 assert(module_sym != nullptr, "Failed to obtain Symbol for module name");
676 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
677
678 char* class_path = (patch_mod_args->at(i))->path_string();
679 ResourceMark rm(current);
680 ClasspathStream cp_stream(class_path);
681
682 while (cp_stream.has_next()) {
683 const char* path = cp_stream.get_next();
684 struct stat st;
685 if (os::stat(path, &st) == 0) {
686 // File or directory found
687 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st, false, false);
688 // If the path specification is valid, enter it into this module's list
689 if (new_entry != nullptr) {
690 module_cpl->add_to_list(new_entry);
691 }
692 }
693 }
694
695 // Record the module into the list of --patch-module entries only if
696 // valid ClassPathEntrys have been created
697 if (module_cpl->module_first_entry() != nullptr) {
698 _patch_mod_entries->push(module_cpl);
699 }
700 }
701 }
702
703 // Determine whether the module has been patched via the command-line
704 // option --patch-module
705 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
706 if (_patch_mod_entries != nullptr && _patch_mod_entries->is_nonempty()) {
707 int table_len = _patch_mod_entries->length();
708 for (int i = 0; i < table_len; i++) {
709 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
710 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
711 return true;
712 }
713 }
714 }
715 return false;
716 }
717
718 // Set up the _jrt_entry if present and boot append path
719 void ClassLoader::setup_bootstrap_search_path_impl(JavaThread* current, const char *class_path) {
720 ResourceMark rm(current);
721 ClasspathStream cp_stream(class_path);
722 bool set_base_piece = true;
723
724 #if INCLUDE_CDS
725 if (CDSConfig::is_dumping_archive()) {
726 if (!Arguments::has_jimage()) {
727 vm_exit_during_initialization("CDS is not supported in exploded JDK build", nullptr);
728 }
729 }
730 #endif
731
732 while (cp_stream.has_next()) {
733 const char* path = cp_stream.get_next();
734
735 if (set_base_piece) {
736 // The first time through the bootstrap_search setup, it must be determined
737 // what the base or core piece of the boot loader search is. Either a java runtime
738 // image is present or this is an exploded module build situation.
739 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
740 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
741 struct stat st;
742 if (os::stat(path, &st) == 0) {
743 // Directory found
744 if (JImage_file != nullptr) {
745 assert(Arguments::has_jimage(), "sanity check");
746 const char* canonical_path = get_canonical_path(path, current);
747 assert(canonical_path != nullptr, "canonical_path issue");
748
749 _jrt_entry = new ClassPathImageEntry(JImage_file, canonical_path);
750 assert(_jrt_entry != nullptr && _jrt_entry->is_modules_image(), "No java runtime image present");
751 assert(_jrt_entry->jimage() != nullptr, "No java runtime image");
752 } // else it's an exploded build.
753 } else {
754 // If path does not exist, exit
755 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
756 }
757 set_base_piece = false;
758 } else {
759 // Every entry on the boot class path after the initial base piece,
760 // which is set by os::set_boot_path(), is considered an appended entry.
761 update_class_path_entry_list(current, path, /* check_for_duplicates */ false,
762 /* is_boot_append */ true, /* from_class_path_attr */ false);
763 }
764 }
765 }
766
767 // Gets the exploded path for the named module. The memory for the path
768 // is allocated on the C heap if `c_heap` is true otherwise in the resource area.
769 static const char* get_exploded_module_path(const char* module_name, bool c_heap) {
770 const char *home = Arguments::get_java_home();
771 const char file_sep = os::file_separator()[0];
772 // 10 represents the length of "modules" + 2 file separators + \0
773 size_t len = strlen(home) + strlen(module_name) + 10;
774 char *path = c_heap ? NEW_C_HEAP_ARRAY(char, len, mtModule) : NEW_RESOURCE_ARRAY(char, len);
775 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
776 return path;
777 }
778
779 // During an exploded modules build, each module defined to the boot loader
780 // will be added to the ClassLoader::_exploded_entries array.
781 void ClassLoader::add_to_exploded_build_list(JavaThread* current, Symbol* module_sym) {
782 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
783 assert(_exploded_entries != nullptr, "_exploded_entries was not initialized");
784
785 // Find the module's symbol
786 ResourceMark rm(current);
787 const char *module_name = module_sym->as_C_string();
788 const char *path = get_exploded_module_path(module_name, false);
789
790 struct stat st;
791 if (os::stat(path, &st) == 0) {
792 // Directory found
793 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st, false, false);
794
795 // If the path specification is valid, enter it into this module's list.
796 // There is no need to check for duplicate modules in the exploded entry list,
797 // since no two modules with the same name can be defined to the boot loader.
798 // This is checked at module definition time in Modules::define_module.
799 if (new_entry != nullptr) {
800 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
801 module_cpl->add_to_list(new_entry);
802 {
803 MutexLocker ml(current, Module_lock);
804 _exploded_entries->push(module_cpl);
805 }
806 log_info(class, load)("path: %s", path);
807 }
808 }
809 }
810
811 jzfile* ClassLoader::open_zip_file(const char* canonical_path, char** error_msg, JavaThread* thread) {
812 // enable call to C land
813 ThreadToNativeFromVM ttn(thread);
814 HandleMark hm(thread);
815 return ZipLibrary::open(canonical_path, error_msg);
816 }
817
818 ClassPathEntry* ClassLoader::create_class_path_entry(JavaThread* current,
819 const char *path, const struct stat* st,
820 bool is_boot_append,
821 bool from_class_path_attr) {
822 ClassPathEntry* new_entry = nullptr;
823 if ((st->st_mode & S_IFMT) == S_IFREG) {
824 ResourceMark rm(current);
825 // Regular file, should be a zip file
826 // Canonicalized filename
827 const char* canonical_path = get_canonical_path(path, current);
828 if (canonical_path == nullptr) {
829 return nullptr;
830 }
831 char* error_msg = nullptr;
832 jzfile* zip = open_zip_file(canonical_path, &error_msg, current);
833 if (zip != nullptr && error_msg == nullptr) {
834 new_entry = new ClassPathZipEntry(zip, path, from_class_path_attr);
835 } else {
836 #if INCLUDE_CDS
837 ClassLoaderExt::set_has_non_jar_in_classpath();
838 #endif
839 return nullptr;
840 }
841 log_info(class, path)("opened: %s", path);
842 log_info(class, load)("opened: %s", path);
843 } else {
844 // Directory
845 new_entry = new ClassPathDirEntry(path);
846 log_info(class, load)("path: %s", path);
847 }
848 return new_entry;
849 }
850
851
852 // Create a class path zip entry for a given path (return null if not found
853 // or zip/JAR file cannot be opened)
854 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
855 // check for a regular file
856 struct stat st;
857 if (os::stat(path, &st) == 0) {
858 if ((st.st_mode & S_IFMT) == S_IFREG) {
859 JavaThread* thread = JavaThread::current();
860 ResourceMark rm(thread);
861 const char* canonical_path = get_canonical_path(path, thread);
862 if (canonical_path != nullptr) {
863 char* error_msg = nullptr;
864 jzfile* zip = open_zip_file(canonical_path, &error_msg, thread);
865 if (zip != nullptr && error_msg == nullptr) {
866 // create using canonical path
867 return new ClassPathZipEntry(zip, canonical_path, false);
868 }
869 }
870 }
871 }
872 return nullptr;
873 }
874
875 // The boot append entries are added with a lock, and read lock free.
876 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
877 if (new_entry != nullptr) {
878 MutexLocker ml(Bootclasspath_lock, Mutex::_no_safepoint_check_flag);
879 if (_last_append_entry == nullptr) {
880 _last_append_entry = new_entry;
881 assert(first_append_entry() == nullptr, "boot loader's append class path entry list not empty");
882 Atomic::release_store(&_first_append_entry_list, new_entry);
883 } else {
884 _last_append_entry->set_next(new_entry);
885 _last_append_entry = new_entry;
886 }
887 }
888 }
889
890 // Record the path entries specified in -cp during dump time. The recorded
891 // information will be used at runtime for loading the archived app classes.
892 //
893 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for
894 // loading app classes. Instead, the app class are loaded by the
895 // jdk/internal/loader/ClassLoaders$AppClassLoader instance.
896 bool ClassLoader::add_to_app_classpath_entries(JavaThread* current,
897 ClassPathEntry* entry,
898 bool check_for_duplicates) {
899 #if INCLUDE_CDS
900 assert(entry != nullptr, "ClassPathEntry should not be nullptr");
901 ClassPathEntry* e = _app_classpath_entries;
902 if (check_for_duplicates) {
903 while (e != nullptr) {
904 if (strcmp(e->name(), entry->name()) == 0 &&
905 e->from_class_path_attr() == entry->from_class_path_attr()) {
906 // entry already exists
907 return false;
908 }
909 e = e->next();
910 }
911 }
912
913 // The entry does not exist, add to the list
914 if (_app_classpath_entries == nullptr) {
915 assert(_last_app_classpath_entry == nullptr, "Sanity");
916 _app_classpath_entries = _last_app_classpath_entry = entry;
917 } else {
918 _last_app_classpath_entry->set_next(entry);
919 _last_app_classpath_entry = entry;
920 }
921
922 if (entry->is_jar_file()) {
923 ClassLoaderExt::process_jar_manifest(current, entry);
924 }
925 #endif
926 return true;
927 }
928
929 // Returns true IFF the file/dir exists and the entry was successfully created.
930 bool ClassLoader::update_class_path_entry_list(JavaThread* current,
931 const char *path,
932 bool check_for_duplicates,
933 bool is_boot_append,
934 bool from_class_path_attr) {
935 struct stat st;
936 if (os::stat(path, &st) == 0) {
937 // File or directory found
938 ClassPathEntry* new_entry = nullptr;
939 new_entry = create_class_path_entry(current, path, &st, is_boot_append, from_class_path_attr);
940 if (new_entry == nullptr) {
941 return false;
942 }
943
944 // Do not reorder the bootclasspath which would break get_system_package().
945 // Add new entry to linked list
946 if (is_boot_append) {
947 add_to_boot_append_entries(new_entry);
948 } else {
949 if (!add_to_app_classpath_entries(current, new_entry, check_for_duplicates)) {
950 // new_entry is not saved, free it now
951 delete new_entry;
952 }
953 }
954 return true;
955 } else {
956 return false;
957 }
958 }
959
960 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
961 ResourceMark rm;
962 int num_of_entries = module_list->length();
963 for (int i = 0; i < num_of_entries; i++) {
964 ClassPathEntry* e;
965 ModuleClassPathList* mpl = module_list->at(i);
966 tty->print("%s=", mpl->module_name()->as_C_string());
967 e = mpl->module_first_entry();
968 while (e != nullptr) {
969 tty->print("%s", e->name());
970 e = e->next();
971 if (e != nullptr) {
972 tty->print("%s", os::path_separator());
973 }
974 }
975 tty->print(" ;");
976 }
977 }
978
979 void ClassLoader::print_bootclasspath() {
980 ClassPathEntry* e;
981 tty->print("[bootclasspath= ");
982
983 // Print --patch-module module/path specifications first
984 if (_patch_mod_entries != nullptr) {
985 print_module_entry_table(_patch_mod_entries);
986 }
987
988 // [jimage | exploded modules build]
989 if (has_jrt_entry()) {
990 // Print the location of the java runtime image
991 tty->print("%s ;", _jrt_entry->name());
992 } else {
993 // Print exploded module build path specifications
994 if (_exploded_entries != nullptr) {
995 print_module_entry_table(_exploded_entries);
996 }
997 }
998
999 // appended entries
1000 e = first_append_entry();
1001 while (e != nullptr) {
1002 tty->print("%s ;", e->name());
1003 e = e->next();
1004 }
1005 tty->print_cr("]");
1006 }
1007
1008 void* ClassLoader::dll_lookup(void* lib, const char* name, const char* path) {
1009 void* func = os::dll_lookup(lib, name);
1010 if (func == nullptr) {
1011 char msg[256] = "";
1012 jio_snprintf(msg, sizeof(msg), "Could not resolve \"%s\"", name);
1013 vm_exit_during_initialization(msg, path);
1014 }
1015 return func;
1016 }
1017
1018 void ClassLoader::load_java_library() {
1019 assert(CanonicalizeEntry == nullptr, "should not load java library twice");
1020 void *javalib_handle = os::native_java_library();
1021 if (javalib_handle == nullptr) {
1022 vm_exit_during_initialization("Unable to load java library", nullptr);
1023 }
1024
1025 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, dll_lookup(javalib_handle, "JDK_Canonicalize", nullptr));
1026 }
1027
1028 void ClassLoader::load_jimage_library() {
1029 assert(JImageOpen == nullptr, "should not load jimage library twice");
1030 char path[JVM_MAXPATHLEN];
1031 char ebuf[1024];
1032 void* handle = nullptr;
1033 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1034 handle = os::dll_load(path, ebuf, sizeof ebuf);
1035 }
1036 if (handle == nullptr) {
1037 vm_exit_during_initialization("Unable to load jimage library", path);
1038 }
1039
1040 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, dll_lookup(handle, "JIMAGE_Open", path));
1041 JImageClose = CAST_TO_FN_PTR(JImageClose_t, dll_lookup(handle, "JIMAGE_Close", path));
1042 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, dll_lookup(handle, "JIMAGE_FindResource", path));
1043 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, dll_lookup(handle, "JIMAGE_GetResource", path));
1044 }
1045
1046 int ClassLoader::crc32(int crc, const char* buf, int len) {
1047 return ZipLibrary::crc32(crc, (const jbyte*)buf, len);
1048 }
1049
1050 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1051 // Look up the name in the boot loader's package entry table.
1052 if (name != nullptr) {
1053 TempNewSymbol package_sym = SymbolTable::new_symbol(name);
1054 // Look for the package entry in the boot loader's package entry table.
1055 PackageEntry* package =
1056 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1057
1058 // Return null if package does not exist or if no classes in that package
1059 // have been loaded.
1060 if (package != nullptr && package->has_loaded_class()) {
1061 ModuleEntry* module = package->module();
1062 if (module->location() != nullptr) {
1063 ResourceMark rm(THREAD);
1064 Handle ml = java_lang_String::create_from_str(
1065 module->location()->as_C_string(), THREAD);
1066 return ml();
1067 }
1068 // Return entry on boot loader class path.
1069 Handle cph = java_lang_String::create_from_str(
1070 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1071 return cph();
1072 }
1073 }
1074 return nullptr;
1075 }
1076
1077 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1078 ResourceMark rm(THREAD);
1079 // List of pointers to PackageEntrys that have loaded classes.
1080 PackageEntryTable* pe_table =
1081 ClassLoaderData::the_null_class_loader_data()->packages();
1082 GrowableArray<PackageEntry*>* loaded_class_pkgs = pe_table->get_system_packages();
1083
1084 // Allocate objArray and fill with java.lang.String
1085 objArrayOop r = oopFactory::new_objArray(vmClasses::String_klass(),
1086 loaded_class_pkgs->length(), CHECK_NULL);
1087 objArrayHandle result(THREAD, r);
1088 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1089 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1090 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1091 result->obj_at_put(x, str());
1092 }
1093 return result();
1094 }
1095
1096 // caller needs ResourceMark
1097 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1098 int class_name_len) {
1099 assert(class_name != nullptr, "invariant");
1100 assert((int)strlen(class_name) == class_name_len, "invariant");
1101
1102 static const char class_suffix[] = ".class";
1103 size_t class_suffix_len = sizeof(class_suffix);
1104
1105 char* const file_name = NEW_RESOURCE_ARRAY(char,
1106 class_name_len +
1107 class_suffix_len); // includes term null
1108
1109 strncpy(file_name, class_name, class_name_len);
1110 strncpy(&file_name[class_name_len], class_suffix, class_suffix_len);
1111
1112 return file_name;
1113 }
1114
1115 static ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1116 const GrowableArray<ModuleClassPathList*>* const module_list) {
1117 int num_of_entries = module_list->length();
1118 const Symbol* class_module_name = mod_entry->name();
1119
1120 // Loop through all the modules in either the patch-module or exploded entries looking for module
1121 for (int i = 0; i < num_of_entries; i++) {
1122 ModuleClassPathList* module_cpl = module_list->at(i);
1123 Symbol* module_cpl_name = module_cpl->module_name();
1124
1125 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1126 // Class' module has been located.
1127 return module_cpl->module_first_entry();
1128 }
1129 }
1130 return nullptr;
1131 }
1132
1133
1134 // Search the module list for the class file stream based on the file name and java package
1135 ClassFileStream* ClassLoader::search_module_entries(JavaThread* current,
1136 const GrowableArray<ModuleClassPathList*>* const module_list,
1137 PackageEntry* pkg_entry, // Java package entry derived from the class name
1138 const char* const file_name) {
1139 ClassFileStream* stream = nullptr;
1140
1141 // Find the defining module in the boot loader's module entry table
1142 ModuleEntry* mod_entry = (pkg_entry != nullptr) ? pkg_entry->module() : nullptr;
1143
1144 // If the module system has not defined java.base yet, then
1145 // classes loaded are assumed to be defined to java.base.
1146 // When java.base is eventually defined by the module system,
1147 // all packages of classes that have been previously loaded
1148 // are verified in ModuleEntryTable::verify_javabase_packages().
1149 if (!Universe::is_module_initialized() &&
1150 !ModuleEntryTable::javabase_defined() &&
1151 mod_entry == nullptr) {
1152 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1153 }
1154
1155 // The module must be a named module
1156 ClassPathEntry* e = nullptr;
1157 if (mod_entry != nullptr && mod_entry->is_named()) {
1158 if (module_list == _exploded_entries) {
1159 // The exploded build entries can be added to at any time so a lock is
1160 // needed when searching them.
1161 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1162 MutexLocker ml(current, Module_lock);
1163 e = find_first_module_cpe(mod_entry, module_list);
1164 } else {
1165 e = find_first_module_cpe(mod_entry, module_list);
1166 }
1167 }
1168
1169 // Try to load the class from the module's ClassPathEntry list.
1170 while (e != nullptr) {
1171 stream = e->open_stream(current, file_name);
1172 // No context.check is required since CDS is not supported
1173 // for an exploded modules build or if --patch-module is specified.
1174 if (nullptr != stream) {
1175 return stream;
1176 }
1177 e = e->next();
1178 }
1179 // If the module was located, break out even if the class was not
1180 // located successfully from that module's ClassPathEntry list.
1181 // There will not be another valid entry for that module.
1182 return nullptr;
1183 }
1184
1185 // Called by the boot classloader to load classes
1186 InstanceKlass* ClassLoader::load_class(Symbol* name, PackageEntry* pkg_entry, bool search_append_only, TRAPS) {
1187 assert(name != nullptr, "invariant");
1188
1189 ResourceMark rm(THREAD);
1190 HandleMark hm(THREAD);
1191
1192 const char* const class_name = name->as_C_string();
1193
1194 EventMarkClassLoading m("Loading class %s", class_name);
1195
1196 const char* const file_name = file_name_for_class_name(class_name,
1197 name->utf8_length());
1198 assert(file_name != nullptr, "invariant");
1199
1200 // Lookup stream for parsing .class file
1201 ClassFileStream* stream = nullptr;
1202 s2 classpath_index = 0;
1203 ClassPathEntry* e = nullptr;
1204
1205 // If search_append_only is true, boot loader visibility boundaries are
1206 // set to be _first_append_entry to the end. This includes:
1207 // [-Xbootclasspath/a]; [jvmti appended entries]
1208 //
1209 // If search_append_only is false, boot loader visibility boundaries are
1210 // set to be the --patch-module entries plus the base piece. This includes:
1211 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1212 //
1213
1214 // Load Attempt #1: --patch-module
1215 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1216 // attempt to load the class from those locations specific to the module.
1217 // Specifications to --patch-module can contain a partial number of classes
1218 // that are part of the overall module definition. So if a particular class is not
1219 // found within its module specification, the search should continue to Load Attempt #2.
1220 // Note: The --patch-module entries are never searched if the boot loader's
1221 // visibility boundary is limited to only searching the append entries.
1222 if (_patch_mod_entries != nullptr && !search_append_only) {
1223 assert(!CDSConfig::is_dumping_archive(), "CDS doesn't support --patch-module during dumping");
1224 stream = search_module_entries(THREAD, _patch_mod_entries, pkg_entry, file_name);
1225 }
1226
1227 // Load Attempt #2: [jimage | exploded build]
1228 if (!search_append_only && (nullptr == stream)) {
1229 if (has_jrt_entry()) {
1230 e = _jrt_entry;
1231 stream = _jrt_entry->open_stream(THREAD, file_name);
1232 } else {
1233 // Exploded build - attempt to locate class in its defining module's location.
1234 assert(_exploded_entries != nullptr, "No exploded build entries present");
1235 assert(!CDSConfig::is_dumping_archive(), "CDS dumping doesn't support exploded build");
1236 stream = search_module_entries(THREAD, _exploded_entries, pkg_entry, file_name);
1237 }
1238 }
1239
1240 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1241 if (search_append_only && (nullptr == stream)) {
1242 // For the boot loader append path search, the starting classpath_index
1243 // for the appended piece is always 1 to account for either the
1244 // _jrt_entry or the _exploded_entries.
1245 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1246 classpath_index = 1;
1247
1248 e = first_append_entry();
1249 while (e != nullptr) {
1250 stream = e->open_stream(THREAD, file_name);
1251 if (nullptr != stream) {
1252 break;
1253 }
1254 e = e->next();
1255 ++classpath_index;
1256 }
1257 }
1258
1259 if (nullptr == stream) {
1260 return nullptr;
1261 }
1262
1263 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1264 Handle protection_domain;
1265 ClassLoadInfo cl_info(protection_domain);
1266
1267 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1268 name,
1269 loader_data,
1270 cl_info,
1271 CHECK_NULL);
1272 result->set_classpath_index(classpath_index);
1273 return result;
1274 }
1275
1276 #if INCLUDE_CDS
1277 static const char* skip_uri_protocol(const char* source) {
1278 if (strncmp(source, "file:", 5) == 0) {
1279 // file: protocol path could start with file:/ or file:///
1280 // locate the char after all the forward slashes
1281 int offset = 5;
1282 while (*(source + offset) == '/') {
1283 offset++;
1284 }
1285 source += offset;
1286 // for non-windows platforms, move back one char as the path begins with a '/'
1287 #ifndef _WINDOWS
1288 source -= 1;
1289 #endif
1290 } else if (strncmp(source, "jrt:/", 5) == 0) {
1291 source += 5;
1292 }
1293 return source;
1294 }
1295
1296 static char decode_percent_encoded(const char *str, size_t& index) {
1297 if (str[index] == '%'
1298 && isxdigit(str[index + 1])
1299 && isxdigit(str[index + 2])) {
1300 char hex[3];
1301 hex[0] = str[index + 1];
1302 hex[1] = str[index + 2];
1303 hex[2] = '\0';
1304 index += 2;
1305 return (char) strtol(hex, nullptr, 16);
1306 }
1307 return str[index];
1308 }
1309
1310 char* ClassLoader::uri_to_path(const char* uri) {
1311 const size_t len = strlen(uri) + 1;
1312 char* path = NEW_RESOURCE_ARRAY(char, len);
1313
1314 uri = skip_uri_protocol(uri);
1315
1316 if (strncmp(uri, "//", 2) == 0) {
1317 // Skip the empty "authority" part
1318 uri += 2;
1319 }
1320
1321 #ifdef _WINDOWS
1322 if (uri[0] == '/') {
1323 // Absolute path name on Windows does not begin with a slash
1324 uri += 1;
1325 }
1326 #endif
1327
1328 size_t path_index = 0;
1329 for (size_t i = 0; i < strlen(uri); ++i) {
1330 char decoded = decode_percent_encoded(uri, i);
1331 path[path_index++] = decoded;
1332 }
1333 path[path_index] = '\0';
1334 return path;
1335 }
1336
1337 // Record the shared classpath index and loader type for classes loaded
1338 // by the builtin loaders at dump time.
1339 void ClassLoader::record_result(JavaThread* current, InstanceKlass* ik,
1340 const ClassFileStream* stream, bool redefined) {
1341 assert(CDSConfig::is_dumping_archive(), "sanity");
1342 assert(stream != nullptr, "sanity");
1343
1344 if (ik->is_hidden()) {
1345 record_hidden_class(ik);
1346 return;
1347 }
1348
1349 oop loader = ik->class_loader();
1350 char* src = (char*)stream->source();
1351 if (src == nullptr) {
1352 if (loader == nullptr) {
1353 // JFR classes
1354 ik->set_shared_classpath_index(0);
1355 ik->set_shared_class_loader_type(ClassLoader::BOOT_LOADER);
1356 }
1357 return;
1358 }
1359
1360 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1361
1362 ResourceMark rm(current);
1363 int classpath_index = -1;
1364 PackageEntry* pkg_entry = ik->package();
1365
1366 if (FileMapInfo::get_number_of_shared_paths() > 0) {
1367 // Save the path from the file: protocol or the module name from the jrt: protocol
1368 // if no protocol prefix is found, path is the same as stream->source(). This path
1369 // must be valid since the class has been successfully parsed.
1370 const char* path = ClassLoader::uri_to_path(src);
1371 assert(path != nullptr, "sanity");
1372 for (int i = 0; i < FileMapInfo::get_number_of_shared_paths(); i++) {
1373 SharedClassPathEntry* ent = FileMapInfo::shared_path(i);
1374 // A shared path has been validated during its creation in ClassLoader::create_class_path_entry(),
1375 // it must be valid here.
1376 assert(ent->name() != nullptr, "sanity");
1377 // If the path (from the class stream source) is the same as the shared
1378 // class or module path, then we have a match.
1379 // src may come from the App/Platform class loaders, which would canonicalize
1380 // the file name. We cannot use strcmp to check for equality against ent->name().
1381 // We must use os::same_files (which is faster than canonicalizing ent->name()).
1382 if (os::same_files(ent->name(), path)) {
1383 // null pkg_entry and pkg_entry in an unnamed module implies the class
1384 // is from the -cp or boot loader append path which consists of -Xbootclasspath/a
1385 // and jvmti appended entries.
1386 if ((pkg_entry == nullptr) || (pkg_entry->in_unnamed_module())) {
1387 // Ensure the index is within the -cp range before assigning
1388 // to the classpath_index.
1389 if (SystemDictionary::is_system_class_loader(loader) &&
1390 (i >= ClassLoaderExt::app_class_paths_start_index()) &&
1391 (i < ClassLoaderExt::app_module_paths_start_index())) {
1392 classpath_index = i;
1393 break;
1394 } else {
1395 if ((i >= 1) &&
1396 (i < ClassLoaderExt::app_class_paths_start_index())) {
1397 // The class must be from boot loader append path which consists of
1398 // -Xbootclasspath/a and jvmti appended entries.
1399 assert(loader == nullptr, "sanity");
1400 classpath_index = i;
1401 break;
1402 }
1403 }
1404 } else {
1405 // A class from a named module from the --module-path. Ensure the index is
1406 // within the --module-path range before assigning to the classpath_index.
1407 if ((pkg_entry != nullptr) && !(pkg_entry->in_unnamed_module()) && (i > 0)) {
1408 if (i >= ClassLoaderExt::app_module_paths_start_index() &&
1409 i < FileMapInfo::get_number_of_shared_paths()) {
1410 classpath_index = i;
1411 break;
1412 }
1413 }
1414 }
1415 }
1416 // for index 0 and the stream->source() is the modules image or has the jrt: protocol.
1417 // The class must be from the runtime modules image.
1418 if (i == 0 && (stream->from_boot_loader_modules_image() || string_starts_with(src, "jrt:"))) {
1419 classpath_index = i;
1420 break;
1421 }
1422 }
1423
1424 // No path entry found for this class: most likely a shared class loaded by the
1425 // user defined classloader.
1426 if (classpath_index < 0 && !SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
1427 assert(ik->shared_classpath_index() < 0, "not assigned yet");
1428 ik->set_shared_classpath_index(UNREGISTERED_INDEX);
1429 SystemDictionaryShared::set_shared_class_misc_info(ik, (ClassFileStream*)stream);
1430 return;
1431 }
1432 } else {
1433 // The shared path table is set up after module system initialization.
1434 // The path table contains no entry before that. Any classes loaded prior
1435 // to the setup of the shared path table must be from the modules image.
1436 assert(stream->from_boot_loader_modules_image(), "stream must be loaded by boot loader from modules image");
1437 assert(FileMapInfo::get_number_of_shared_paths() == 0, "shared path table must not have been setup");
1438 classpath_index = 0;
1439 }
1440
1441 const char* const class_name = ik->name()->as_C_string();
1442 const char* const file_name = file_name_for_class_name(class_name,
1443 ik->name()->utf8_length());
1444 assert(file_name != nullptr, "invariant");
1445 ClassLoaderExt::record_result(checked_cast<s2>(classpath_index), ik, redefined);
1446 }
1447
1448 void ClassLoader::record_hidden_class(InstanceKlass* ik) {
1449 assert(ik->is_hidden(), "must be");
1450
1451 s2 classloader_type;
1452 if (HeapShared::is_lambda_form_klass(ik)) {
1453 classloader_type = ClassLoader::BOOT_LOADER;
1454 } else {
1455 oop loader = ik->class_loader();
1456
1457 if (loader == nullptr) {
1458 classloader_type = ClassLoader::BOOT_LOADER;
1459 } else if (SystemDictionary::is_platform_class_loader(loader)) {
1460 classloader_type = ClassLoader::PLATFORM_LOADER;
1461 } else if (SystemDictionary::is_system_class_loader(loader)) {
1462 classloader_type = ClassLoader::APP_LOADER;
1463 } else {
1464 // This class won't be archived, so no need to update its
1465 // classloader_type/classpath_index.
1466 return;
1467 }
1468 }
1469 ik->set_shared_class_loader_type(classloader_type);
1470
1471 if (HeapShared::is_lambda_proxy_klass(ik)) {
1472 InstanceKlass* nest_host = ik->nest_host_not_null();
1473 ik->set_shared_classpath_index(nest_host->shared_classpath_index());
1474 } else if (HeapShared::is_lambda_form_klass(ik)) {
1475 ik->set_shared_classpath_index(0);
1476 } else {
1477 // Generated invoker classes.
1478 if (classloader_type == ClassLoader::APP_LOADER) {
1479 ik->set_shared_classpath_index(ClassLoaderExt::app_class_paths_start_index());
1480 } else {
1481 ik->set_shared_classpath_index(0);
1482 }
1483 }
1484 }
1485 #endif // INCLUDE_CDS
1486
1487 // Initialize the class loader's access to methods in libzip. Parse and
1488 // process the boot classpath into a list ClassPathEntry objects. Once
1489 // this list has been created, it must not change order (see class PackageInfo)
1490 // it can be appended to and is by jvmti.
1491
1492 void ClassLoader::initialize(TRAPS) {
1493 if (UsePerfData) {
1494 // jvmstat performance counters
1495 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1496 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1497 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1498 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1499 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1500 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1501 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1502 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1503 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1504 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1505 NEWPERFEVENTCOUNTER(_perf_class_init_bytecodes_count, SUN_CLS, "clinitBytecodesCount");
1506
1507 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1508 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1509 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1510 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1511 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1512 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1513 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1514 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1515 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1516 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1517 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, "unsafeDefineClassCalls");
1518 NEWPERFTICKCOUNTER(_perf_secondary_hash_time, SUN_CLS, "secondarySuperHashTime");
1519
1520 if (log_is_enabled(Info, perf, class, link) || log_is_enabled(Info, init)) {
1521 NEWPERFTICKCOUNTER(_perf_preload_total_time, SUN_CLS, "preloadTotalTime");
1522 NEWPERFTICKCOUNTER(_perf_preload_time, SUN_CLS, "preloadTime");
1523 NEWPERFTICKCOUNTER(_perf_prelink_time, SUN_CLS, "prelinkTime");
1524 NEWPERFTICKCOUNTER(_perf_preinit_time, SUN_CLS, "preinitTime");
1525 NEWPERFTICKCOUNTER(_perf_preresolve_time, SUN_CLS, "preresolveTime");
1526
1527 NEWPERFTICKCOUNTER(_perf_ik_link_methods_time, SUN_CLS, "linkMethodsTime");
1528 NEWPERFTICKCOUNTER(_perf_method_adapters_time, SUN_CLS, "makeAdaptersTime");
1529 NEWPERFEVENTCOUNTER(_perf_ik_link_methods_count, SUN_CLS, "linkMethodsCount");
1530 NEWPERFEVENTCOUNTER(_perf_method_adapters_count, SUN_CLS, "makeAdaptersCount");
1531
1532 NEWPERFTICKCOUNTERS(_perf_resolve_indy_time, SUN_CLS, "resolve_invokedynamic_time");
1533 NEWPERFTICKCOUNTERS(_perf_resolve_invokehandle_time, SUN_CLS, "resolve_invokehandle_time");
1534 NEWPERFTICKCOUNTERS(_perf_resolve_mh_time, SUN_CLS, "resolve_MethodHandle_time");
1535 NEWPERFTICKCOUNTERS(_perf_resolve_mt_time, SUN_CLS, "resolve_MethodType_time");
1536
1537 NEWPERFEVENTCOUNTER(_perf_resolve_indy_count, SUN_CLS, "resolve_invokedynamic_count");
1538 NEWPERFEVENTCOUNTER(_perf_resolve_invokehandle_count, SUN_CLS, "resolve_invokehandle_count");
1539 NEWPERFEVENTCOUNTER(_perf_resolve_mh_count, SUN_CLS, "resolve_MethodHandle_count");
1540 NEWPERFEVENTCOUNTER(_perf_resolve_mt_count, SUN_CLS, "resolve_MethodType_count");
1541 }
1542 }
1543
1544 // lookup java library entry points
1545 load_java_library();
1546 // jimage library entry points are loaded below, in lookup_vm_options
1547 setup_bootstrap_search_path(THREAD);
1548 }
1549
1550 static char* lookup_vm_resource(JImageFile *jimage, const char *jimage_version, const char *path) {
1551 jlong size;
1552 JImageLocationRef location = (*JImageFindResource)(jimage, "java.base", jimage_version, path, &size);
1553 if (location == 0)
1554 return nullptr;
1555 char *val = NEW_C_HEAP_ARRAY(char, size+1, mtClass);
1556 (*JImageGetResource)(jimage, location, val, size);
1557 val[size] = '\0';
1558 return val;
1559 }
1560
1561 // Lookup VM options embedded in the modules jimage file
1562 char* ClassLoader::lookup_vm_options() {
1563 jint error;
1564 char modules_path[JVM_MAXPATHLEN];
1565 const char* fileSep = os::file_separator();
1566
1567 // Initialize jimage library entry points
1568 load_jimage_library();
1569
1570 jio_snprintf(modules_path, JVM_MAXPATHLEN, "%s%slib%smodules", Arguments::get_java_home(), fileSep, fileSep);
1571 JImage_file =(*JImageOpen)(modules_path, &error);
1572 if (JImage_file == nullptr) {
1573 return nullptr;
1574 }
1575
1576 const char *jimage_version = get_jimage_version_string();
1577 char *options = lookup_vm_resource(JImage_file, jimage_version, "jdk/internal/vm/options");
1578 return options;
1579 }
1580
1581 bool ClassLoader::is_module_observable(const char* module_name) {
1582 assert(JImageOpen != nullptr, "jimage library should have been opened");
1583 if (JImage_file == nullptr) {
1584 struct stat st;
1585 const char *path = get_exploded_module_path(module_name, true);
1586 bool res = os::stat(path, &st) == 0;
1587 FREE_C_HEAP_ARRAY(char, path);
1588 return res;
1589 }
1590 jlong size;
1591 const char *jimage_version = get_jimage_version_string();
1592 return (*JImageFindResource)(JImage_file, module_name, jimage_version, "module-info.class", &size) != 0;
1593 }
1594
1595 #if INCLUDE_CDS
1596 void ClassLoader::initialize_shared_path(JavaThread* current) {
1597 if (CDSConfig::is_dumping_archive()) {
1598 ClassLoaderExt::setup_search_paths(current);
1599 }
1600 }
1601
1602 void ClassLoader::initialize_module_path(TRAPS) {
1603 if (CDSConfig::is_dumping_archive()) {
1604 ClassLoaderExt::setup_module_paths(THREAD);
1605 FileMapInfo::allocate_shared_path_table(CHECK);
1606 }
1607 }
1608
1609 // Helper function used by CDS code to get the number of module path
1610 // entries during shared classpath setup time.
1611 int ClassLoader::num_module_path_entries() {
1612 assert(CDSConfig::is_dumping_archive(), "sanity");
1613 int num_entries = 0;
1614 ClassPathEntry* e= ClassLoader::_module_path_entries;
1615 while (e != nullptr) {
1616 num_entries ++;
1617 e = e->next();
1618 }
1619 return num_entries;
1620 }
1621 #endif
1622
1623 jlong ClassLoader::classloader_time_ms() {
1624 return UsePerfData ?
1625 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1626 }
1627
1628 jlong ClassLoader::class_init_bytecodes_count() {
1629 return UsePerfData ? _perf_class_init_bytecodes_count->get_value() : -1;
1630 }
1631
1632 jlong ClassLoader::class_init_count() {
1633 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1634 }
1635
1636 jlong ClassLoader::class_init_time_ms() {
1637 return UsePerfData ?
1638 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1639 }
1640
1641 jlong ClassLoader::class_verify_time_ms() {
1642 return UsePerfData ?
1643 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1644 }
1645
1646 jlong ClassLoader::class_link_count() {
1647 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1648 }
1649
1650 jlong ClassLoader::class_link_time_ms() {
1651 return UsePerfData ?
1652 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1653 }
1654
1655 int ClassLoader::compute_Object_vtable() {
1656 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1657 // code to determine actual value from file
1658 // Would be value '11' if finals were in vtable
1659 int JDK_1_2_Object_vtable_size = 5;
1660 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1661 }
1662
1663
1664 void classLoader_init1() {
1665 EXCEPTION_MARK;
1666 ClassLoader::initialize(THREAD);
1667 if (HAS_PENDING_EXCEPTION) {
1668 vm_exit_during_initialization("ClassLoader::initialize() failed unexpectedly");
1669 }
1670 }
1671
1672 // Complete the ClassPathEntry setup for the boot loader
1673 void ClassLoader::classLoader_init2(JavaThread* current) {
1674 // Setup the list of module/path pairs for --patch-module processing
1675 // This must be done after the SymbolTable is created in order
1676 // to use fast_compare on module names instead of a string compare.
1677 if (Arguments::get_patch_mod_prefix() != nullptr) {
1678 setup_patch_mod_entries();
1679 }
1680
1681 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1682 // to successfully determine if java.base has been patched)
1683 create_javabase();
1684
1685 // Setup the initial java.base/path pair for the exploded build entries.
1686 // As more modules are defined during module system initialization, more
1687 // entries will be added to the exploded build array.
1688 if (!has_jrt_entry()) {
1689 assert(!CDSConfig::is_dumping_archive(), "not supported with exploded module builds");
1690 assert(!CDSConfig::is_using_archive(), "UsedSharedSpaces not supported with exploded module builds");
1691 // Set up the boot loader's _exploded_entries list. Note that this gets
1692 // done before loading any classes, by the same thread that will
1693 // subsequently do the first class load. So, no lock is needed for this.
1694 assert(_exploded_entries == nullptr, "Should only get initialized once");
1695 _exploded_entries = new (mtModule)
1696 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, mtModule);
1697 add_to_exploded_build_list(current, vmSymbols::java_base());
1698 }
1699 }
1700
1701 char* ClassLoader::get_canonical_path(const char* orig, Thread* thread) {
1702 assert(orig != nullptr, "bad arguments");
1703 // caller needs to allocate ResourceMark for the following output buffer
1704 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
1705 ResourceMark rm(thread);
1706 // os::native_path writes into orig_copy
1707 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(orig)+1);
1708 strcpy(orig_copy, orig);
1709 if ((CanonicalizeEntry)(os::native_path(orig_copy), canonical_path, JVM_MAXPATHLEN) < 0) {
1710 return nullptr;
1711 }
1712 return canonical_path;
1713 }
1714
1715 void ClassLoader::create_javabase() {
1716 JavaThread* current = JavaThread::current();
1717
1718 // Create java.base's module entry for the boot
1719 // class loader prior to loading j.l.Object.
1720 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1721
1722 // Get module entry table
1723 ModuleEntryTable* null_cld_modules = null_cld->modules();
1724 if (null_cld_modules == nullptr) {
1725 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1726 }
1727
1728 {
1729 MutexLocker ml(current, Module_lock);
1730 if (ModuleEntryTable::javabase_moduleEntry() == nullptr) { // may have been inited by CDS.
1731 ModuleEntry* jb_module = null_cld_modules->locked_create_entry(Handle(),
1732 false, vmSymbols::java_base(), nullptr, nullptr, null_cld);
1733 if (jb_module == nullptr) {
1734 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1735 }
1736 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1737 }
1738 }
1739 }
1740
1741 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1742 // they could get inlined by aggressive compiler, an unknown trick, see bug 6966589.
1743 void PerfClassTraceTime::initialize() {
1744 if (!UsePerfData) return;
1745
1746 if (_eventp != nullptr) {
1747 // increment the event counter
1748 _eventp->inc();
1749 }
1750
1751 // stop the current active thread-local timer to measure inclusive time
1752 _prev_active_event = -1;
1753 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1754 if (_timers[i].is_active()) {
1755 assert(_prev_active_event == -1, "should have only one active timer");
1756 _prev_active_event = i;
1757 _timers[i].stop();
1758 }
1759 }
1760
1761 if (_recursion_counters == nullptr || (_recursion_counters[_event_type])++ == 0) {
1762 // start the inclusive timer if not recursively called
1763 _t.start();
1764 }
1765
1766 // start thread-local timer of the given event type
1767 if (!_timers[_event_type].is_active()) {
1768 _timers[_event_type].start();
1769 }
1770 }
1771
1772 PerfClassTraceTime::~PerfClassTraceTime() {
1773 if (!UsePerfData) return;
1774
1775 // stop the thread-local timer as the event completes
1776 // and resume the thread-local timer of the event next on the stack
1777 _timers[_event_type].stop();
1778 jlong selftime = _timers[_event_type].ticks();
1779
1780 if (_prev_active_event >= 0) {
1781 _timers[_prev_active_event].start();
1782 }
1783
1784 if (_recursion_counters != nullptr && --(_recursion_counters[_event_type]) > 0) return;
1785
1786 // increment the counters only on the leaf call
1787 _t.stop();
1788 _timep->inc(_t.ticks());
1789 if (_selftimep != nullptr) {
1790 _selftimep->inc(selftime);
1791 }
1792 // add all class loading related event selftime to the accumulated time counter
1793 ClassLoader::perf_accumulated_time()->inc(selftime);
1794
1795 // reset the timer
1796 _timers[_event_type].reset();
1797 }