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, bool multi_release) : ClassPathEntry() {
330 _zip = zip;
331 _zip_name = copy_path(zip_name);
332 _from_class_path_attr = from_class_path_attr;
333 _multi_release = multi_release;
334 }
335
336 ClassPathZipEntry::~ClassPathZipEntry() {
337 ZipLibrary::close(_zip);
338 FREE_C_HEAP_ARRAY(char, _zip_name);
339 }
340
341 bool ClassPathZipEntry::has_entry(JavaThread* current, const char* name) {
342 ThreadToNativeFromVM ttn(current);
343 // check whether zip archive contains name
344 jint name_len;
345 jint filesize;
346 jzentry* entry = ZipLibrary::find_entry(_zip, name, &filesize, &name_len);
347 if (entry == nullptr) {
348 return false;
349 } else {
350 ZipLibrary::free_entry(_zip, entry);
351 return true;
352 }
353 }
354
355 u1* ClassPathZipEntry::open_entry(JavaThread* current, const char* name, jint* filesize, bool nul_terminate) {
356 // enable call to C land
357 ThreadToNativeFromVM ttn(current);
358 // check whether zip archive contains name
359 jint name_len;
360 jzentry* entry = ZipLibrary::find_entry(_zip, name, filesize, &name_len);
361 if (entry == nullptr) return nullptr;
362 u1* buffer;
363 char name_buf[128];
364 char* filename;
365 if (name_len < 128) {
366 filename = name_buf;
367 } else {
368 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
369 }
370
371 // read contents into resource array
372 size_t size = (uint32_t)(*filesize);
373 if (nul_terminate) {
374 if (sizeof(size) == sizeof(uint32_t) && size == UINT_MAX) {
375 return nullptr; // 32-bit integer overflow will occur.
376 }
377 size++;
378 }
379
380 // ZIP_ReadEntry also frees zentry
381 buffer = NEW_RESOURCE_ARRAY(u1, size);
382 if (!ZipLibrary::read_entry(_zip, entry, buffer, filename)) {
383 return nullptr;
384 }
385
386 // return result
387 if (nul_terminate) {
388 buffer[size - 1] = 0;
389 }
390 return buffer;
391 }
392
393 ClassFileStream* ClassPathZipEntry::open_stream(JavaThread* current, const char* name) {
394 jint filesize;
395 u1* buffer = open_entry(current, name, &filesize, false);
396 if (buffer == nullptr) {
397 return nullptr;
398 }
399 if (UsePerfData) {
400 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
401 }
402 // Resource allocated
403 return new ClassFileStream(buffer,
404 filesize,
405 _zip_name);
406 }
407
408 DEBUG_ONLY(ClassPathImageEntry* ClassPathImageEntry::_singleton = nullptr;)
409
410 JImageFile* ClassPathImageEntry::jimage() const {
411 return JImage_file;
412 }
413
414 JImageFile* ClassPathImageEntry::jimage_non_null() const {
415 assert(ClassLoader::has_jrt_entry(), "must be");
416 assert(jimage() != nullptr, "should have been opened by ClassLoader::lookup_vm_options "
417 "and remained throughout normal JVM lifetime");
418 return jimage();
419 }
420
421 void ClassPathImageEntry::close_jimage() {
422 if (jimage() != nullptr) {
423 (*JImageClose)(jimage());
424 JImage_file = nullptr;
425 }
426 }
427
428 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
429 ClassPathEntry() {
430 guarantee(jimage != nullptr, "jimage file is null");
431 guarantee(name != nullptr, "jimage file name is null");
432 assert(_singleton == nullptr, "VM supports only one jimage");
433 DEBUG_ONLY(_singleton = this);
434 size_t len = strlen(name) + 1;
435 _name = copy_path(name);
436 }
437
438 ClassFileStream* ClassPathImageEntry::open_stream(JavaThread* current, const char* name) {
439 return open_stream_for_loader(current, name, ClassLoaderData::the_null_class_loader_data());
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(JavaThread* current, const char* name, ClassLoaderData* loader_data) {
450 jlong size;
451 JImageLocationRef location = (*JImageFindResource)(jimage_non_null(), "", get_jimage_version_string(), name, &size);
452
453 if (location == 0) {
454 TempNewSymbol class_name = SymbolTable::new_symbol(name);
455 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name);
456
457 if (pkg_name != nullptr) {
458 if (!Universe::is_module_initialized()) {
459 location = (*JImageFindResource)(jimage_non_null(), JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
460 } else {
461 PackageEntry* package_entry = ClassLoader::get_package_entry(pkg_name, loader_data);
462 if (package_entry != nullptr) {
463 ResourceMark rm(current);
464 // Get the module name
465 ModuleEntry* module = package_entry->module();
466 assert(module != nullptr, "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 != nullptr) {
470 location = (*JImageFindResource)(jimage_non_null(), 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_non_null(), location, data, size);
482 // Resource allocated
483 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be");
484 return new ClassFileStream((u1*)data,
485 checked_cast<int>(size),
486 _name,
487 true); // from_boot_loader_modules_image
488 }
489
490 return nullptr;
491 }
492
493 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
494 const char* module_name,
495 const char* file_name,
496 jlong &size) {
497 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
498 }
499
500 bool ClassPathImageEntry::is_modules_image() const {
501 assert(this == _singleton, "VM supports a single jimage");
502 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be used for jrt entry");
503 return true;
504 }
505
506 #if INCLUDE_CDS
507 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
508 assert(CDSConfig::is_dumping_archive(), "sanity");
509 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
510 vm_exit_during_cds_dumping(error, message);
511 }
512 #endif
513
514 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
515 _module_name = module_name;
516 _module_first_entry = nullptr;
517 _module_last_entry = nullptr;
518 }
519
520 ModuleClassPathList::~ModuleClassPathList() {
521 // Clean out each ClassPathEntry on list
522 ClassPathEntry* e = _module_first_entry;
523 while (e != nullptr) {
524 ClassPathEntry* next_entry = e->next();
525 delete e;
526 e = next_entry;
527 }
528 }
529
530 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
531 if (new_entry != nullptr) {
532 if (_module_last_entry == nullptr) {
533 _module_first_entry = _module_last_entry = new_entry;
534 } else {
535 _module_last_entry->set_next(new_entry);
536 _module_last_entry = new_entry;
537 }
538 }
539 }
540
541 void ClassLoader::trace_class_path(const char* msg, const char* name) {
542 LogTarget(Info, class, path) lt;
543 if (lt.is_enabled()) {
544 LogStream ls(lt);
545 if (msg) {
546 ls.print("%s", msg);
547 }
548 if (name) {
549 if (strlen(name) < 256) {
550 ls.print("%s", name);
551 } else {
552 // For very long paths, we need to print each character separately,
553 // as print_cr() has a length limit
554 while (name[0] != '\0') {
555 ls.print("%c", name[0]);
556 name++;
557 }
558 }
559 }
560 ls.cr();
561 }
562 }
563
564 void ClassLoader::setup_bootstrap_search_path(JavaThread* current) {
565 const char* bootcp = Arguments::get_boot_class_path();
566 assert(bootcp != nullptr, "Boot class path must not be nullptr");
567 if (PrintSharedArchiveAndExit) {
568 // Don't print bootcp - this is the bootcp of this current VM process, not necessarily
569 // the same as the boot classpath of the shared archive.
570 } else {
571 trace_class_path("bootstrap loader class path=", bootcp);
572 }
573 setup_bootstrap_search_path_impl(current, bootcp);
574 }
575
576 #if INCLUDE_CDS
577 void ClassLoader::setup_app_search_path(JavaThread* current, const char *class_path) {
578 assert(CDSConfig::is_dumping_archive(), "sanity");
579
580 ResourceMark rm(current);
581 ClasspathStream cp_stream(class_path);
582
583 int exclusion_start_index = INT_MAX;
584 size_t limit = SIZE_MAX;
585 if (CacheOnlyClassesIn != nullptr) {
586 char* appclasspath = Arguments::get_appclasspath();
587 bool bad = false;
588 if (strstr(appclasspath, CacheOnlyClassesIn) != appclasspath) {
589 bad = true;
590 } else {
591 limit = strlen(CacheOnlyClassesIn);
592 if (limit > 0 && limit < strlen(appclasspath)
593 && CacheOnlyClassesIn[limit-1] != os::path_separator()[0]
594 && appclasspath[limit] != os::path_separator()[0]) {
595 bad = true;
596 }
597 }
598 if (bad) {
599 vm_exit_during_initialization(err_msg("CacheOnlyClassesIn \"%s\" must be a proper prefix of the CLASSPATH \"%s\"",
600 CacheOnlyClassesIn, appclasspath));
601 }
602 }
603
604 while (cp_stream.has_next()) {
605 if (cp_stream.num_chars_consumed() >= limit && exclusion_start_index == INT_MAX) {
606 exclusion_start_index = num_boot_classpath_entries() + num_app_classpath_entries();
607 }
608 const char* path = cp_stream.get_next();
609 update_class_path_entry_list(current, path, /* check_for_duplicates */ true,
610 /* is_boot_append */ false, /* from_class_path_attr */ false);
611 }
612
613 ClassLoaderExt::set_app_class_exclusion_start_path_index(exclusion_start_index);
614 if (exclusion_start_index != INT_MAX) {
615 log_info(cds)("Exclude all app classes whose shared_classpath_index is greater than %d", exclusion_start_index);
616 }
617 }
618
619 void ClassLoader::add_to_module_path_entries(const char* path,
620 ClassPathEntry* entry) {
621 assert(entry != nullptr, "ClassPathEntry should not be nullptr");
622 assert(CDSConfig::is_dumping_archive(), "sanity");
623
624 // The entry does not exist, add to the list
625 if (_module_path_entries == nullptr) {
626 assert(_last_module_path_entry == nullptr, "Sanity");
627 _module_path_entries = _last_module_path_entry = entry;
628 } else {
629 _last_module_path_entry->set_next(entry);
630 _last_module_path_entry = entry;
631 }
632 }
633
634 // Add a module path to the _module_path_entries list.
635 void ClassLoader::setup_module_search_path(JavaThread* current, const char* path) {
636 assert(CDSConfig::is_dumping_archive(), "sanity");
637 struct stat st;
638 if (os::stat(path, &st) != 0) {
639 tty->print_cr("os::stat error %d (%s). CDS dump aborted (path was \"%s\").",
640 errno, os::errno_name(errno), path);
641 vm_exit_during_initialization();
642 }
643 // File or directory found
644 ClassPathEntry* new_entry = nullptr;
645 new_entry = create_class_path_entry(current, path, &st,
646 false /*is_boot_append */, false /* from_class_path_attr */);
647 if (new_entry != nullptr) {
648 // ClassLoaderExt::process_module_table() filters out non-jar entries before calling this function.
649 assert(new_entry->is_jar_file(), "module path entry %s is not a jar file", new_entry->name());
650 add_to_module_path_entries(path, new_entry);
651 }
652 }
653
654 #endif // INCLUDE_CDS
655
656 void ClassLoader::close_jrt_image() {
657 // Not applicable for exploded builds
658 if (!ClassLoader::has_jrt_entry()) return;
659 _jrt_entry->close_jimage();
660 }
661
662 // Construct the array of module/path pairs as specified to --patch-module
663 // for the boot loader to search ahead of the jimage, if the class being
664 // loaded is defined to a module that has been specified to --patch-module.
665 void ClassLoader::setup_patch_mod_entries() {
666 JavaThread* current = JavaThread::current();
667 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
668 int num_of_entries = patch_mod_args->length();
669
670 // Set up the boot loader's _patch_mod_entries list
671 _patch_mod_entries = new (mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, mtModule);
672
673 for (int i = 0; i < num_of_entries; i++) {
674 const char* module_name = (patch_mod_args->at(i))->module_name();
675 Symbol* const module_sym = SymbolTable::new_symbol(module_name);
676 assert(module_sym != nullptr, "Failed to obtain Symbol for module name");
677 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
678
679 char* class_path = (patch_mod_args->at(i))->path_string();
680 ResourceMark rm(current);
681 ClasspathStream cp_stream(class_path);
682
683 while (cp_stream.has_next()) {
684 const char* path = cp_stream.get_next();
685 struct stat st;
686 if (os::stat(path, &st) == 0) {
687 // File or directory found
688 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st, false, false);
689 // If the path specification is valid, enter it into this module's list
690 if (new_entry != nullptr) {
691 module_cpl->add_to_list(new_entry);
692 }
693 }
694 }
695
696 // Record the module into the list of --patch-module entries only if
697 // valid ClassPathEntrys have been created
698 if (module_cpl->module_first_entry() != nullptr) {
699 _patch_mod_entries->push(module_cpl);
700 }
701 }
702 }
703
704 // Determine whether the module has been patched via the command-line
705 // option --patch-module
706 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
707 if (_patch_mod_entries != nullptr && _patch_mod_entries->is_nonempty()) {
708 int table_len = _patch_mod_entries->length();
709 for (int i = 0; i < table_len; i++) {
710 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
711 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
712 return true;
713 }
714 }
715 }
716 return false;
717 }
718
719 // Set up the _jrt_entry if present and boot append path
720 void ClassLoader::setup_bootstrap_search_path_impl(JavaThread* current, const char *class_path) {
721 ResourceMark rm(current);
722 ClasspathStream cp_stream(class_path);
723 bool set_base_piece = true;
724
725 #if INCLUDE_CDS
726 if (CDSConfig::is_dumping_archive()) {
727 if (!Arguments::has_jimage()) {
728 vm_exit_during_initialization("CDS is not supported in exploded JDK build", nullptr);
729 }
730 }
731 #endif
732
733 while (cp_stream.has_next()) {
734 const char* path = cp_stream.get_next();
735
736 if (set_base_piece) {
737 // The first time through the bootstrap_search setup, it must be determined
738 // what the base or core piece of the boot loader search is. Either a java runtime
739 // image is present or this is an exploded module build situation.
740 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
741 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
742 struct stat st;
743 if (os::stat(path, &st) == 0) {
744 // Directory found
745 if (JImage_file != nullptr) {
746 assert(Arguments::has_jimage(), "sanity check");
747 const char* canonical_path = get_canonical_path(path, current);
748 assert(canonical_path != nullptr, "canonical_path issue");
749
750 _jrt_entry = new ClassPathImageEntry(JImage_file, canonical_path);
751 assert(_jrt_entry != nullptr && _jrt_entry->is_modules_image(), "No java runtime image present");
752 assert(_jrt_entry->jimage() != nullptr, "No java runtime image");
753 } // else it's an exploded build.
754 } else {
755 // If path does not exist, exit
756 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
757 }
758 set_base_piece = false;
759 } else {
760 // Every entry on the boot class path after the initial base piece,
761 // which is set by os::set_boot_path(), is considered an appended entry.
762 update_class_path_entry_list(current, path, /* check_for_duplicates */ false,
763 /* is_boot_append */ true, /* from_class_path_attr */ false);
764 }
765 }
766 }
767
768 // Gets the exploded path for the named module. The memory for the path
769 // is allocated on the C heap if `c_heap` is true otherwise in the resource area.
770 static const char* get_exploded_module_path(const char* module_name, bool c_heap) {
771 const char *home = Arguments::get_java_home();
772 const char file_sep = os::file_separator()[0];
773 // 10 represents the length of "modules" + 2 file separators + \0
774 size_t len = strlen(home) + strlen(module_name) + 10;
775 char *path = c_heap ? NEW_C_HEAP_ARRAY(char, len, mtModule) : NEW_RESOURCE_ARRAY(char, len);
776 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
777 return path;
778 }
779
780 // During an exploded modules build, each module defined to the boot loader
781 // will be added to the ClassLoader::_exploded_entries array.
782 void ClassLoader::add_to_exploded_build_list(JavaThread* current, Symbol* module_sym) {
783 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
784 assert(_exploded_entries != nullptr, "_exploded_entries was not initialized");
785
786 // Find the module's symbol
787 ResourceMark rm(current);
788 const char *module_name = module_sym->as_C_string();
789 const char *path = get_exploded_module_path(module_name, false);
790
791 struct stat st;
792 if (os::stat(path, &st) == 0) {
793 // Directory found
794 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st, false, false);
795
796 // If the path specification is valid, enter it into this module's list.
797 // There is no need to check for duplicate modules in the exploded entry list,
798 // since no two modules with the same name can be defined to the boot loader.
799 // This is checked at module definition time in Modules::define_module.
800 if (new_entry != nullptr) {
801 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
802 module_cpl->add_to_list(new_entry);
803 {
804 MutexLocker ml(current, Module_lock);
805 _exploded_entries->push(module_cpl);
806 }
807 log_info(class, load)("path: %s", path);
808 }
809 }
810 }
811
812 jzfile* ClassLoader::open_zip_file(const char* canonical_path, char** error_msg, JavaThread* thread) {
813 // enable call to C land
814 ThreadToNativeFromVM ttn(thread);
815 HandleMark hm(thread);
816 return ZipLibrary::open(canonical_path, error_msg);
817 }
818
819 ClassPathEntry* ClassLoader::create_class_path_entry(JavaThread* current,
820 const char *path, const struct stat* st,
821 bool is_boot_append,
822 bool from_class_path_attr,
823 bool is_multi_release) {
824 ClassPathEntry* new_entry = nullptr;
825 if ((st->st_mode & S_IFMT) == S_IFREG) {
826 ResourceMark rm(current);
827 // Regular file, should be a zip file
828 // Canonicalized filename
829 const char* canonical_path = get_canonical_path(path, current);
830 if (canonical_path == nullptr) {
831 return nullptr;
832 }
833 char* error_msg = nullptr;
834 jzfile* zip = open_zip_file(canonical_path, &error_msg, current);
835 if (zip != nullptr && error_msg == nullptr) {
836 new_entry = new ClassPathZipEntry(zip, path, from_class_path_attr, is_multi_release);
837 } else {
838 #if INCLUDE_CDS
839 ClassLoaderExt::set_has_non_jar_in_classpath();
840 #endif
841 return nullptr;
842 }
843 log_info(class, path)("opened: %s", path);
844 log_info(class, load)("opened: %s", path);
845 } else {
846 // Directory
847 new_entry = new ClassPathDirEntry(path);
848 log_info(class, load)("path: %s", path);
849 }
850 return new_entry;
851 }
852
853
854 // Create a class path zip entry for a given path (return null if not found
855 // or zip/JAR file cannot be opened)
856 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
857 // check for a regular file
858 struct stat st;
859 if (os::stat(path, &st) == 0) {
860 if ((st.st_mode & S_IFMT) == S_IFREG) {
861 JavaThread* thread = JavaThread::current();
862 ResourceMark rm(thread);
863 const char* canonical_path = get_canonical_path(path, thread);
864 if (canonical_path != nullptr) {
865 char* error_msg = nullptr;
866 jzfile* zip = open_zip_file(canonical_path, &error_msg, thread);
867 if (zip != nullptr && error_msg == nullptr) {
868 // create using canonical path
869 return new ClassPathZipEntry(zip, canonical_path, false, false);
870 }
871 }
872 }
873 }
874 return nullptr;
875 }
876
877 // The boot append entries are added with a lock, and read lock free.
878 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
879 if (new_entry != nullptr) {
880 MutexLocker ml(Bootclasspath_lock, Mutex::_no_safepoint_check_flag);
881 if (_last_append_entry == nullptr) {
882 _last_append_entry = new_entry;
883 assert(first_append_entry() == nullptr, "boot loader's append class path entry list not empty");
884 Atomic::release_store(&_first_append_entry_list, new_entry);
885 } else {
886 _last_append_entry->set_next(new_entry);
887 _last_append_entry = new_entry;
888 }
889 }
890 }
891
892 // Record the path entries specified in -cp during dump time. The recorded
893 // information will be used at runtime for loading the archived app classes.
894 //
895 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for
896 // loading app classes. Instead, the app class are loaded by the
897 // jdk/internal/loader/ClassLoaders$AppClassLoader instance.
898 bool ClassLoader::add_to_app_classpath_entries(JavaThread* current,
899 ClassPathEntry* entry,
900 bool check_for_duplicates) {
901 #if INCLUDE_CDS
902 assert(entry != nullptr, "ClassPathEntry should not be nullptr");
903 ClassPathEntry* e = _app_classpath_entries;
904 if (check_for_duplicates) {
905 while (e != nullptr) {
906 if (strcmp(e->name(), entry->name()) == 0 &&
907 e->from_class_path_attr() == entry->from_class_path_attr()) {
908 // entry already exists
909 return false;
910 }
911 e = e->next();
912 }
913 }
914
915 // The entry does not exist, add to the list
916 if (_app_classpath_entries == nullptr) {
917 assert(_last_app_classpath_entry == nullptr, "Sanity");
918 _app_classpath_entries = _last_app_classpath_entry = entry;
919 } else {
920 _last_app_classpath_entry->set_next(entry);
921 _last_app_classpath_entry = entry;
922 }
923
924 if (entry->is_jar_file()) {
925 ClassLoaderExt::process_jar_manifest(current, entry);
926 }
927 #endif
928 return true;
929 }
930
931 // Returns true IFF the file/dir exists and the entry was successfully created.
932 bool ClassLoader::update_class_path_entry_list(JavaThread* current,
933 const char *path,
934 bool check_for_duplicates,
935 bool is_boot_append,
936 bool from_class_path_attr) {
937 struct stat st;
938 if (os::stat(path, &st) == 0) {
939 // File or directory found
940 ClassPathEntry* new_entry = nullptr;
941 new_entry = create_class_path_entry(current, path, &st, is_boot_append, from_class_path_attr);
942 if (new_entry == nullptr) {
943 return false;
944 }
945
946 // Do not reorder the bootclasspath which would break get_system_package().
947 // Add new entry to linked list
948 if (is_boot_append) {
949 add_to_boot_append_entries(new_entry);
950 } else {
951 if (!add_to_app_classpath_entries(current, new_entry, check_for_duplicates)) {
952 // new_entry is not saved, free it now
953 delete new_entry;
954 }
955 }
956 return true;
957 } else {
958 return false;
959 }
960 }
961
962 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
963 ResourceMark rm;
964 int num_of_entries = module_list->length();
965 for (int i = 0; i < num_of_entries; i++) {
966 ClassPathEntry* e;
967 ModuleClassPathList* mpl = module_list->at(i);
968 tty->print("%s=", mpl->module_name()->as_C_string());
969 e = mpl->module_first_entry();
970 while (e != nullptr) {
971 tty->print("%s", e->name());
972 e = e->next();
973 if (e != nullptr) {
974 tty->print("%s", os::path_separator());
975 }
976 }
977 tty->print(" ;");
978 }
979 }
980
981 void ClassLoader::print_bootclasspath() {
982 ClassPathEntry* e;
983 tty->print("[bootclasspath= ");
984
985 // Print --patch-module module/path specifications first
986 if (_patch_mod_entries != nullptr) {
987 print_module_entry_table(_patch_mod_entries);
988 }
989
990 // [jimage | exploded modules build]
991 if (has_jrt_entry()) {
992 // Print the location of the java runtime image
993 tty->print("%s ;", _jrt_entry->name());
994 } else {
995 // Print exploded module build path specifications
996 if (_exploded_entries != nullptr) {
997 print_module_entry_table(_exploded_entries);
998 }
999 }
1000
1001 // appended entries
1002 e = first_append_entry();
1003 while (e != nullptr) {
1004 tty->print("%s ;", e->name());
1005 e = e->next();
1006 }
1007 tty->print_cr("]");
1008 }
1009
1010 void* ClassLoader::dll_lookup(void* lib, const char* name, const char* path) {
1011 void* func = os::dll_lookup(lib, name);
1012 if (func == nullptr) {
1013 char msg[256] = "";
1014 jio_snprintf(msg, sizeof(msg), "Could not resolve \"%s\"", name);
1015 vm_exit_during_initialization(msg, path);
1016 }
1017 return func;
1018 }
1019
1020 void ClassLoader::load_java_library() {
1021 assert(CanonicalizeEntry == nullptr, "should not load java library twice");
1022 if (is_vm_statically_linked()) {
1023 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::lookup_function("JDK_Canonicalize"));
1024 assert(CanonicalizeEntry != nullptr, "could not lookup JDK_Canonicalize");
1025 return;
1026 }
1027
1028 void *javalib_handle = os::native_java_library();
1029 if (javalib_handle == nullptr) {
1030 vm_exit_during_initialization("Unable to load java library", nullptr);
1031 }
1032
1033 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, dll_lookup(javalib_handle, "JDK_Canonicalize", nullptr));
1034 assert(CanonicalizeEntry != nullptr, "could not lookup JDK_Canonicalize in java library");
1035 }
1036
1037 void ClassLoader::load_jimage_library() {
1038 assert(JImageOpen == nullptr, "should not load jimage library twice");
1039
1040 if (is_vm_statically_linked()) {
1041 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::lookup_function("JIMAGE_Open"));
1042 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::lookup_function("JIMAGE_Close"));
1043 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::lookup_function("JIMAGE_FindResource"));
1044 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::lookup_function("JIMAGE_GetResource"));
1045 assert(JImageOpen != nullptr && JImageClose != nullptr &&
1046 JImageFindResource != nullptr && JImageGetResource != nullptr,
1047 "could not lookup all jimage library functions");
1048 return;
1049 }
1050
1051 char path[JVM_MAXPATHLEN];
1052 char ebuf[1024];
1053 void* handle = nullptr;
1054 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
1055 handle = os::dll_load(path, ebuf, sizeof ebuf);
1056 }
1057 if (handle == nullptr) {
1058 vm_exit_during_initialization("Unable to load jimage library", path);
1059 }
1060
1061 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, dll_lookup(handle, "JIMAGE_Open", path));
1062 JImageClose = CAST_TO_FN_PTR(JImageClose_t, dll_lookup(handle, "JIMAGE_Close", path));
1063 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, dll_lookup(handle, "JIMAGE_FindResource", path));
1064 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, dll_lookup(handle, "JIMAGE_GetResource", path));
1065 assert(JImageOpen != nullptr && JImageClose != nullptr &&
1066 JImageFindResource != nullptr && JImageGetResource != nullptr,
1067 "could not lookup all jimage library functions in jimage library");
1068 }
1069
1070 int ClassLoader::crc32(int crc, const char* buf, int len) {
1071 return ZipLibrary::crc32(crc, (const jbyte*)buf, len);
1072 }
1073
1074 oop ClassLoader::get_system_package(const char* name, TRAPS) {
1075 // Look up the name in the boot loader's package entry table.
1076 if (name != nullptr) {
1077 TempNewSymbol package_sym = SymbolTable::new_symbol(name);
1078 // Look for the package entry in the boot loader's package entry table.
1079 PackageEntry* package =
1080 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
1081
1082 // Return null if package does not exist or if no classes in that package
1083 // have been loaded.
1084 if (package != nullptr && package->has_loaded_class()) {
1085 ModuleEntry* module = package->module();
1086 if (module->location() != nullptr) {
1087 ResourceMark rm(THREAD);
1088 Handle ml = java_lang_String::create_from_str(
1089 module->location()->as_C_string(), THREAD);
1090 return ml();
1091 }
1092 // Return entry on boot loader class path.
1093 Handle cph = java_lang_String::create_from_str(
1094 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1095 return cph();
1096 }
1097 }
1098 return nullptr;
1099 }
1100
1101 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1102 ResourceMark rm(THREAD);
1103 // List of pointers to PackageEntrys that have loaded classes.
1104 PackageEntryTable* pe_table =
1105 ClassLoaderData::the_null_class_loader_data()->packages();
1106 GrowableArray<PackageEntry*>* loaded_class_pkgs = pe_table->get_system_packages();
1107
1108 // Allocate objArray and fill with java.lang.String
1109 objArrayOop r = oopFactory::new_objArray(vmClasses::String_klass(),
1110 loaded_class_pkgs->length(), CHECK_NULL);
1111 objArrayHandle result(THREAD, r);
1112 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1113 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1114 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1115 result->obj_at_put(x, str());
1116 }
1117 return result();
1118 }
1119
1120 // caller needs ResourceMark
1121 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1122 int class_name_len) {
1123 assert(class_name != nullptr, "invariant");
1124 assert((int)strlen(class_name) == class_name_len, "invariant");
1125
1126 static const char class_suffix[] = ".class";
1127 size_t class_suffix_len = sizeof(class_suffix);
1128
1129 char* const file_name = NEW_RESOURCE_ARRAY(char,
1130 class_name_len +
1131 class_suffix_len); // includes term null
1132
1133 strncpy(file_name, class_name, class_name_len);
1134 strncpy(&file_name[class_name_len], class_suffix, class_suffix_len);
1135
1136 return file_name;
1137 }
1138
1139 static ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1140 const GrowableArray<ModuleClassPathList*>* const module_list) {
1141 int num_of_entries = module_list->length();
1142 const Symbol* class_module_name = mod_entry->name();
1143
1144 // Loop through all the modules in either the patch-module or exploded entries looking for module
1145 for (int i = 0; i < num_of_entries; i++) {
1146 ModuleClassPathList* module_cpl = module_list->at(i);
1147 Symbol* module_cpl_name = module_cpl->module_name();
1148
1149 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1150 // Class' module has been located.
1151 return module_cpl->module_first_entry();
1152 }
1153 }
1154 return nullptr;
1155 }
1156
1157
1158 // Search the module list for the class file stream based on the file name and java package
1159 ClassFileStream* ClassLoader::search_module_entries(JavaThread* current,
1160 const GrowableArray<ModuleClassPathList*>* const module_list,
1161 PackageEntry* pkg_entry, // Java package entry derived from the class name
1162 const char* const file_name) {
1163 ClassFileStream* stream = nullptr;
1164
1165 // Find the defining module in the boot loader's module entry table
1166 ModuleEntry* mod_entry = (pkg_entry != nullptr) ? pkg_entry->module() : nullptr;
1167
1168 // If the module system has not defined java.base yet, then
1169 // classes loaded are assumed to be defined to java.base.
1170 // When java.base is eventually defined by the module system,
1171 // all packages of classes that have been previously loaded
1172 // are verified in ModuleEntryTable::verify_javabase_packages().
1173 if (!Universe::is_module_initialized() &&
1174 !ModuleEntryTable::javabase_defined() &&
1175 mod_entry == nullptr) {
1176 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1177 }
1178
1179 // The module must be a named module
1180 ClassPathEntry* e = nullptr;
1181 if (mod_entry != nullptr && mod_entry->is_named()) {
1182 if (module_list == _exploded_entries) {
1183 // The exploded build entries can be added to at any time so a lock is
1184 // needed when searching them.
1185 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1186 MutexLocker ml(current, Module_lock);
1187 e = find_first_module_cpe(mod_entry, module_list);
1188 } else {
1189 e = find_first_module_cpe(mod_entry, module_list);
1190 }
1191 }
1192
1193 // Try to load the class from the module's ClassPathEntry list.
1194 while (e != nullptr) {
1195 stream = e->open_stream(current, file_name);
1196 // No context.check is required since CDS is not supported
1197 // for an exploded modules build or if --patch-module is specified.
1198 if (nullptr != stream) {
1199 return stream;
1200 }
1201 e = e->next();
1202 }
1203 // If the module was located, break out even if the class was not
1204 // located successfully from that module's ClassPathEntry list.
1205 // There will not be another valid entry for that module.
1206 return nullptr;
1207 }
1208
1209 // Called by the boot classloader to load classes
1210 InstanceKlass* ClassLoader::load_class(Symbol* name, PackageEntry* pkg_entry, bool search_append_only, TRAPS) {
1211 assert(name != nullptr, "invariant");
1212
1213 ResourceMark rm(THREAD);
1214 HandleMark hm(THREAD);
1215
1216 const char* const class_name = name->as_C_string();
1217
1218 EventMarkClassLoading m("Loading class %s", class_name);
1219
1220 const char* const file_name = file_name_for_class_name(class_name,
1221 name->utf8_length());
1222 assert(file_name != nullptr, "invariant");
1223
1224 // Lookup stream for parsing .class file
1225 ClassFileStream* stream = nullptr;
1226 s2 classpath_index = 0;
1227 ClassPathEntry* e = nullptr;
1228
1229 // If search_append_only is true, boot loader visibility boundaries are
1230 // set to be _first_append_entry to the end. This includes:
1231 // [-Xbootclasspath/a]; [jvmti appended entries]
1232 //
1233 // If search_append_only is false, boot loader visibility boundaries are
1234 // set to be the --patch-module entries plus the base piece. This includes:
1235 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1236 //
1237
1238 // Load Attempt #1: --patch-module
1239 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1240 // attempt to load the class from those locations specific to the module.
1241 // Specifications to --patch-module can contain a partial number of classes
1242 // that are part of the overall module definition. So if a particular class is not
1243 // found within its module specification, the search should continue to Load Attempt #2.
1244 // Note: The --patch-module entries are never searched if the boot loader's
1245 // visibility boundary is limited to only searching the append entries.
1246 if (_patch_mod_entries != nullptr && !search_append_only) {
1247 assert(!CDSConfig::is_dumping_archive(), "CDS doesn't support --patch-module during dumping");
1248 stream = search_module_entries(THREAD, _patch_mod_entries, pkg_entry, file_name);
1249 }
1250
1251 // Load Attempt #2: [jimage | exploded build]
1252 if (!search_append_only && (nullptr == stream)) {
1253 if (has_jrt_entry()) {
1254 e = _jrt_entry;
1255 stream = _jrt_entry->open_stream(THREAD, file_name);
1256 } else {
1257 // Exploded build - attempt to locate class in its defining module's location.
1258 assert(_exploded_entries != nullptr, "No exploded build entries present");
1259 assert(!CDSConfig::is_dumping_archive(), "CDS dumping doesn't support exploded build");
1260 stream = search_module_entries(THREAD, _exploded_entries, pkg_entry, file_name);
1261 }
1262 }
1263
1264 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1265 if (search_append_only && (nullptr == stream)) {
1266 // For the boot loader append path search, the starting classpath_index
1267 // for the appended piece is always 1 to account for either the
1268 // _jrt_entry or the _exploded_entries.
1269 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1270 classpath_index = 1;
1271
1272 e = first_append_entry();
1273 while (e != nullptr) {
1274 stream = e->open_stream(THREAD, file_name);
1275 if (nullptr != stream) {
1276 break;
1277 }
1278 e = e->next();
1279 ++classpath_index;
1280 }
1281 }
1282
1283 if (nullptr == stream) {
1284 return nullptr;
1285 }
1286
1287 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1288 Handle protection_domain;
1289 ClassLoadInfo cl_info(protection_domain);
1290
1291 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1292 name,
1293 loader_data,
1294 cl_info,
1295 CHECK_NULL);
1296 result->set_classpath_index(classpath_index);
1297 return result;
1298 }
1299
1300 #if INCLUDE_CDS
1301 static const char* skip_uri_protocol(const char* source) {
1302 if (strncmp(source, "file:", 5) == 0) {
1303 // file: protocol path could start with file:/ or file:///
1304 // locate the char after all the forward slashes
1305 int offset = 5;
1306 while (*(source + offset) == '/') {
1307 offset++;
1308 }
1309 source += offset;
1310 // for non-windows platforms, move back one char as the path begins with a '/'
1311 #ifndef _WINDOWS
1312 source -= 1;
1313 #endif
1314 } else if (strncmp(source, "jrt:/", 5) == 0) {
1315 source += 5;
1316 }
1317 return source;
1318 }
1319
1320 static char decode_percent_encoded(const char *str, size_t& index) {
1321 if (str[index] == '%'
1322 && isxdigit(str[index + 1])
1323 && isxdigit(str[index + 2])) {
1324 char hex[3];
1325 hex[0] = str[index + 1];
1326 hex[1] = str[index + 2];
1327 hex[2] = '\0';
1328 index += 2;
1329 return (char) strtol(hex, nullptr, 16);
1330 }
1331 return str[index];
1332 }
1333
1334 char* ClassLoader::uri_to_path(const char* uri) {
1335 const size_t len = strlen(uri) + 1;
1336 char* path = NEW_RESOURCE_ARRAY(char, len);
1337
1338 uri = skip_uri_protocol(uri);
1339
1340 if (strncmp(uri, "//", 2) == 0) {
1341 // Skip the empty "authority" part
1342 uri += 2;
1343 }
1344
1345 #ifdef _WINDOWS
1346 if (uri[0] == '/') {
1347 // Absolute path name on Windows does not begin with a slash
1348 uri += 1;
1349 }
1350 #endif
1351
1352 size_t path_index = 0;
1353 for (size_t i = 0; i < strlen(uri); ++i) {
1354 char decoded = decode_percent_encoded(uri, i);
1355 path[path_index++] = decoded;
1356 }
1357 path[path_index] = '\0';
1358 return path;
1359 }
1360
1361 // Record the shared classpath index and loader type for classes loaded
1362 // by the builtin loaders at dump time.
1363 void ClassLoader::record_result(JavaThread* current, InstanceKlass* ik,
1364 const ClassFileStream* stream, bool redefined) {
1365 assert(CDSConfig::is_dumping_archive(), "sanity");
1366 assert(stream != nullptr, "sanity");
1367
1368 if (ik->is_hidden()) {
1369 record_hidden_class(ik);
1370 return;
1371 }
1372
1373 oop loader = ik->class_loader();
1374 char* src = (char*)stream->source();
1375 if (src == nullptr) {
1376 if (loader == nullptr) {
1377 // JFR classes
1378 ik->set_shared_classpath_index(0);
1379 ik->set_shared_class_loader_type(ClassLoader::BOOT_LOADER);
1380 }
1381 return;
1382 }
1383
1384 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1385
1386 ResourceMark rm(current);
1387 int classpath_index = -1;
1388 PackageEntry* pkg_entry = ik->package();
1389
1390 if (FileMapInfo::get_number_of_shared_paths() > 0) {
1391 // Save the path from the file: protocol or the module name from the jrt: protocol
1392 // if no protocol prefix is found, path is the same as stream->source(). This path
1393 // must be valid since the class has been successfully parsed.
1394 const char* path = ClassLoader::uri_to_path(src);
1395 assert(path != nullptr, "sanity");
1396 for (int i = 0; i < FileMapInfo::get_number_of_shared_paths(); i++) {
1397 SharedClassPathEntry* ent = FileMapInfo::shared_path(i);
1398 // A shared path has been validated during its creation in ClassLoader::create_class_path_entry(),
1399 // it must be valid here.
1400 assert(ent->name() != nullptr, "sanity");
1401 // If the path (from the class stream source) is the same as the shared
1402 // class or module path, then we have a match.
1403 // src may come from the App/Platform class loaders, which would canonicalize
1404 // the file name. We cannot use strcmp to check for equality against ent->name().
1405 // We must use os::same_files (which is faster than canonicalizing ent->name()).
1406 if (os::same_files(ent->name(), path)) {
1407 // null pkg_entry and pkg_entry in an unnamed module implies the class
1408 // is from the -cp or boot loader append path which consists of -Xbootclasspath/a
1409 // and jvmti appended entries.
1410 if ((pkg_entry == nullptr) || (pkg_entry->in_unnamed_module())) {
1411 // Ensure the index is within the -cp range before assigning
1412 // to the classpath_index.
1413 if (SystemDictionary::is_system_class_loader(loader) &&
1414 (i >= ClassLoaderExt::app_class_paths_start_index()) &&
1415 (i < ClassLoaderExt::app_module_paths_start_index())) {
1416 classpath_index = i;
1417 break;
1418 } else {
1419 if ((i >= 1) &&
1420 (i < ClassLoaderExt::app_class_paths_start_index())) {
1421 // The class must be from boot loader append path which consists of
1422 // -Xbootclasspath/a and jvmti appended entries.
1423 assert(loader == nullptr, "sanity");
1424 classpath_index = i;
1425 break;
1426 }
1427 }
1428 } else {
1429 // A class from a named module from the --module-path. Ensure the index is
1430 // within the --module-path range before assigning to the classpath_index.
1431 if ((pkg_entry != nullptr) && !(pkg_entry->in_unnamed_module()) && (i > 0)) {
1432 if (i >= ClassLoaderExt::app_module_paths_start_index() &&
1433 i < FileMapInfo::get_number_of_shared_paths()) {
1434 classpath_index = i;
1435 break;
1436 }
1437 }
1438 }
1439 }
1440 // for index 0 and the stream->source() is the modules image or has the jrt: protocol.
1441 // The class must be from the runtime modules image.
1442 if (i == 0 && (stream->from_boot_loader_modules_image() || string_starts_with(src, "jrt:"))) {
1443 classpath_index = i;
1444 break;
1445 }
1446 }
1447
1448 // No path entry found for this class: most likely a shared class loaded by the
1449 // user defined classloader.
1450 if (classpath_index < 0 && !SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
1451 assert(ik->shared_classpath_index() < 0, "not assigned yet");
1452 ik->set_shared_classpath_index(UNREGISTERED_INDEX);
1453 SystemDictionaryShared::set_shared_class_misc_info(ik, (ClassFileStream*)stream);
1454 return;
1455 }
1456 } else {
1457 // The shared path table is set up after module system initialization.
1458 // The path table contains no entry before that. Any classes loaded prior
1459 // to the setup of the shared path table must be from the modules image.
1460 assert(stream->from_boot_loader_modules_image(), "stream must be loaded by boot loader from modules image");
1461 assert(FileMapInfo::get_number_of_shared_paths() == 0, "shared path table must not have been setup");
1462 classpath_index = 0;
1463 }
1464
1465 const char* const class_name = ik->name()->as_C_string();
1466 const char* const file_name = file_name_for_class_name(class_name,
1467 ik->name()->utf8_length());
1468 assert(file_name != nullptr, "invariant");
1469 ClassLoaderExt::record_result(checked_cast<s2>(classpath_index), ik, redefined);
1470 }
1471
1472 void ClassLoader::record_hidden_class(InstanceKlass* ik) {
1473 assert(ik->is_hidden(), "must be");
1474
1475 s2 classloader_type;
1476 if (HeapShared::is_lambda_form_klass(ik)) {
1477 classloader_type = ClassLoader::BOOT_LOADER;
1478 } else {
1479 oop loader = ik->class_loader();
1480
1481 if (loader == nullptr) {
1482 classloader_type = ClassLoader::BOOT_LOADER;
1483 } else if (SystemDictionary::is_platform_class_loader(loader)) {
1484 classloader_type = ClassLoader::PLATFORM_LOADER;
1485 } else if (SystemDictionary::is_system_class_loader(loader)) {
1486 classloader_type = ClassLoader::APP_LOADER;
1487 } else {
1488 // This class won't be archived, so no need to update its
1489 // classloader_type/classpath_index.
1490 return;
1491 }
1492 }
1493 ik->set_shared_class_loader_type(classloader_type);
1494
1495 if (HeapShared::is_lambda_proxy_klass(ik)) {
1496 InstanceKlass* nest_host = ik->nest_host_not_null();
1497 ik->set_shared_classpath_index(nest_host->shared_classpath_index());
1498 } else if (HeapShared::is_lambda_form_klass(ik)) {
1499 ik->set_shared_classpath_index(0);
1500 } else {
1501 // Generated invoker classes.
1502 if (classloader_type == ClassLoader::APP_LOADER) {
1503 ik->set_shared_classpath_index(ClassLoaderExt::app_class_paths_start_index());
1504 } else {
1505 ik->set_shared_classpath_index(0);
1506 }
1507 }
1508 }
1509 #endif // INCLUDE_CDS
1510
1511 // Initialize the class loader's access to methods in libzip. Parse and
1512 // process the boot classpath into a list ClassPathEntry objects. Once
1513 // this list has been created, it must not change order (see class PackageInfo)
1514 // it can be appended to and is by jvmti.
1515
1516 void ClassLoader::initialize(TRAPS) {
1517 if (UsePerfData) {
1518 // jvmstat performance counters
1519 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1520 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1521 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1522 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1523 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1524 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1525 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1526 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1527 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1528 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1529 NEWPERFEVENTCOUNTER(_perf_class_init_bytecodes_count, SUN_CLS, "clinitBytecodesCount");
1530
1531 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1532 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1533 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1534 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1535 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1536 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1537 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1538 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1539 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1540 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1541 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, "unsafeDefineClassCalls");
1542 NEWPERFTICKCOUNTER(_perf_secondary_hash_time, SUN_CLS, "secondarySuperHashTime");
1543
1544 if (log_is_enabled(Info, perf, class, link) || log_is_enabled(Info, init)) {
1545 NEWPERFTICKCOUNTER(_perf_preload_total_time, SUN_CLS, "preloadTotalTime");
1546 NEWPERFTICKCOUNTER(_perf_preload_time, SUN_CLS, "preloadTime");
1547 NEWPERFTICKCOUNTER(_perf_prelink_time, SUN_CLS, "prelinkTime");
1548 NEWPERFTICKCOUNTER(_perf_preinit_time, SUN_CLS, "preinitTime");
1549 NEWPERFTICKCOUNTER(_perf_preresolve_time, SUN_CLS, "preresolveTime");
1550
1551 NEWPERFTICKCOUNTER(_perf_ik_link_methods_time, SUN_CLS, "linkMethodsTime");
1552 NEWPERFTICKCOUNTER(_perf_method_adapters_time, SUN_CLS, "makeAdaptersTime");
1553 NEWPERFEVENTCOUNTER(_perf_ik_link_methods_count, SUN_CLS, "linkMethodsCount");
1554 NEWPERFEVENTCOUNTER(_perf_method_adapters_count, SUN_CLS, "makeAdaptersCount");
1555
1556 NEWPERFTICKCOUNTERS(_perf_resolve_indy_time, SUN_CLS, "resolve_invokedynamic_time");
1557 NEWPERFTICKCOUNTERS(_perf_resolve_invokehandle_time, SUN_CLS, "resolve_invokehandle_time");
1558 NEWPERFTICKCOUNTERS(_perf_resolve_mh_time, SUN_CLS, "resolve_MethodHandle_time");
1559 NEWPERFTICKCOUNTERS(_perf_resolve_mt_time, SUN_CLS, "resolve_MethodType_time");
1560
1561 NEWPERFEVENTCOUNTER(_perf_resolve_indy_count, SUN_CLS, "resolve_invokedynamic_count");
1562 NEWPERFEVENTCOUNTER(_perf_resolve_invokehandle_count, SUN_CLS, "resolve_invokehandle_count");
1563 NEWPERFEVENTCOUNTER(_perf_resolve_mh_count, SUN_CLS, "resolve_MethodHandle_count");
1564 NEWPERFEVENTCOUNTER(_perf_resolve_mt_count, SUN_CLS, "resolve_MethodType_count");
1565 }
1566 }
1567
1568 // lookup java library entry points
1569 load_java_library();
1570 // jimage library entry points are loaded below, in lookup_vm_options
1571 setup_bootstrap_search_path(THREAD);
1572 }
1573
1574 static char* lookup_vm_resource(JImageFile *jimage, const char *jimage_version, const char *path) {
1575 jlong size;
1576 JImageLocationRef location = (*JImageFindResource)(jimage, "java.base", jimage_version, path, &size);
1577 if (location == 0)
1578 return nullptr;
1579 char *val = NEW_C_HEAP_ARRAY(char, size+1, mtClass);
1580 (*JImageGetResource)(jimage, location, val, size);
1581 val[size] = '\0';
1582 return val;
1583 }
1584
1585 // Lookup VM options embedded in the modules jimage file
1586 char* ClassLoader::lookup_vm_options() {
1587 jint error;
1588 char modules_path[JVM_MAXPATHLEN];
1589 const char* fileSep = os::file_separator();
1590
1591 // Initialize jimage library entry points
1592 load_jimage_library();
1593
1594 jio_snprintf(modules_path, JVM_MAXPATHLEN, "%s%slib%smodules", Arguments::get_java_home(), fileSep, fileSep);
1595 JImage_file =(*JImageOpen)(modules_path, &error);
1596 if (JImage_file == nullptr) {
1597 return nullptr;
1598 }
1599
1600 const char *jimage_version = get_jimage_version_string();
1601 char *options = lookup_vm_resource(JImage_file, jimage_version, "jdk/internal/vm/options");
1602 return options;
1603 }
1604
1605 bool ClassLoader::is_module_observable(const char* module_name) {
1606 assert(JImageOpen != nullptr, "jimage library should have been opened");
1607 if (JImage_file == nullptr) {
1608 struct stat st;
1609 const char *path = get_exploded_module_path(module_name, true);
1610 bool res = os::stat(path, &st) == 0;
1611 FREE_C_HEAP_ARRAY(char, path);
1612 return res;
1613 }
1614 jlong size;
1615 const char *jimage_version = get_jimage_version_string();
1616 return (*JImageFindResource)(JImage_file, module_name, jimage_version, "module-info.class", &size) != 0;
1617 }
1618
1619 #if INCLUDE_CDS
1620 void ClassLoader::initialize_shared_path(JavaThread* current) {
1621 if (CDSConfig::is_dumping_archive()) {
1622 ClassLoaderExt::setup_search_paths(current);
1623 }
1624 }
1625
1626 void ClassLoader::initialize_module_path(TRAPS) {
1627 if (CDSConfig::is_dumping_archive()) {
1628 ClassLoaderExt::setup_module_paths(THREAD);
1629 FileMapInfo::allocate_shared_path_table(CHECK);
1630 }
1631 }
1632
1633 // Helper function used by CDS code to get the number of module path
1634 // entries during shared classpath setup time.
1635 int ClassLoader::num_module_path_entries() {
1636 assert(CDSConfig::is_dumping_archive(), "sanity");
1637 int num_entries = 0;
1638 ClassPathEntry* e= ClassLoader::_module_path_entries;
1639 while (e != nullptr) {
1640 num_entries ++;
1641 e = e->next();
1642 }
1643 return num_entries;
1644 }
1645 #endif
1646
1647 jlong ClassLoader::classloader_time_ms() {
1648 return UsePerfData ?
1649 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1650 }
1651
1652 jlong ClassLoader::class_init_bytecodes_count() {
1653 return UsePerfData ? _perf_class_init_bytecodes_count->get_value() : -1;
1654 }
1655
1656 jlong ClassLoader::class_init_count() {
1657 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1658 }
1659
1660 jlong ClassLoader::class_init_time_ms() {
1661 return UsePerfData ?
1662 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1663 }
1664
1665 jlong ClassLoader::class_verify_time_ms() {
1666 return UsePerfData ?
1667 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1668 }
1669
1670 jlong ClassLoader::class_link_count() {
1671 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1672 }
1673
1674 jlong ClassLoader::class_link_time_ms() {
1675 return UsePerfData ?
1676 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1677 }
1678
1679 int ClassLoader::compute_Object_vtable() {
1680 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1681 // code to determine actual value from file
1682 // Would be value '11' if finals were in vtable
1683 int JDK_1_2_Object_vtable_size = 5;
1684 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1685 }
1686
1687
1688 void classLoader_init1() {
1689 EXCEPTION_MARK;
1690 ClassLoader::initialize(THREAD);
1691 if (HAS_PENDING_EXCEPTION) {
1692 vm_exit_during_initialization("ClassLoader::initialize() failed unexpectedly");
1693 }
1694 }
1695
1696 // Complete the ClassPathEntry setup for the boot loader
1697 void ClassLoader::classLoader_init2(JavaThread* current) {
1698 // Setup the list of module/path pairs for --patch-module processing
1699 // This must be done after the SymbolTable is created in order
1700 // to use fast_compare on module names instead of a string compare.
1701 if (Arguments::get_patch_mod_prefix() != nullptr) {
1702 setup_patch_mod_entries();
1703 }
1704
1705 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1706 // to successfully determine if java.base has been patched)
1707 create_javabase();
1708
1709 // Setup the initial java.base/path pair for the exploded build entries.
1710 // As more modules are defined during module system initialization, more
1711 // entries will be added to the exploded build array.
1712 if (!has_jrt_entry()) {
1713 assert(!CDSConfig::is_dumping_archive(), "not supported with exploded module builds");
1714 assert(!CDSConfig::is_using_archive(), "UsedSharedSpaces not supported with exploded module builds");
1715 // Set up the boot loader's _exploded_entries list. Note that this gets
1716 // done before loading any classes, by the same thread that will
1717 // subsequently do the first class load. So, no lock is needed for this.
1718 assert(_exploded_entries == nullptr, "Should only get initialized once");
1719 _exploded_entries = new (mtModule)
1720 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, mtModule);
1721 add_to_exploded_build_list(current, vmSymbols::java_base());
1722 }
1723 }
1724
1725 char* ClassLoader::get_canonical_path(const char* orig, Thread* thread) {
1726 assert(orig != nullptr, "bad arguments");
1727 // caller needs to allocate ResourceMark for the following output buffer
1728 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
1729 ResourceMark rm(thread);
1730 // os::native_path writes into orig_copy
1731 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(orig)+1);
1732 strcpy(orig_copy, orig);
1733 if ((CanonicalizeEntry)(os::native_path(orig_copy), canonical_path, JVM_MAXPATHLEN) < 0) {
1734 return nullptr;
1735 }
1736 return canonical_path;
1737 }
1738
1739 void ClassLoader::create_javabase() {
1740 JavaThread* current = JavaThread::current();
1741
1742 // Create java.base's module entry for the boot
1743 // class loader prior to loading j.l.Object.
1744 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1745
1746 // Get module entry table
1747 ModuleEntryTable* null_cld_modules = null_cld->modules();
1748 if (null_cld_modules == nullptr) {
1749 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1750 }
1751
1752 {
1753 MutexLocker ml(current, Module_lock);
1754 if (ModuleEntryTable::javabase_moduleEntry() == nullptr) { // may have been inited by CDS.
1755 ModuleEntry* jb_module = null_cld_modules->locked_create_entry(Handle(),
1756 false, vmSymbols::java_base(), nullptr, nullptr, null_cld);
1757 if (jb_module == nullptr) {
1758 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1759 }
1760 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1761 }
1762 }
1763 }
1764
1765 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1766 // they could get inlined by aggressive compiler, an unknown trick, see bug 6966589.
1767 void PerfClassTraceTime::initialize() {
1768 if (!UsePerfData) return;
1769
1770 if (_eventp != nullptr) {
1771 // increment the event counter
1772 _eventp->inc();
1773 }
1774
1775 // stop the current active thread-local timer to measure inclusive time
1776 _prev_active_event = -1;
1777 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1778 if (_timers[i].is_active()) {
1779 assert(_prev_active_event == -1, "should have only one active timer");
1780 _prev_active_event = i;
1781 _timers[i].stop();
1782 }
1783 }
1784
1785 if (_recursion_counters == nullptr || (_recursion_counters[_event_type])++ == 0) {
1786 // start the inclusive timer if not recursively called
1787 _t.start();
1788 }
1789
1790 // start thread-local timer of the given event type
1791 if (!_timers[_event_type].is_active()) {
1792 _timers[_event_type].start();
1793 }
1794 }
1795
1796 PerfClassTraceTime::~PerfClassTraceTime() {
1797 if (!UsePerfData) return;
1798
1799 // stop the thread-local timer as the event completes
1800 // and resume the thread-local timer of the event next on the stack
1801 _timers[_event_type].stop();
1802 jlong selftime = _timers[_event_type].ticks();
1803
1804 if (_prev_active_event >= 0) {
1805 _timers[_prev_active_event].start();
1806 }
1807
1808 if (_recursion_counters != nullptr && --(_recursion_counters[_event_type]) > 0) return;
1809
1810 // increment the counters only on the leaf call
1811 _t.stop();
1812 _timep->inc(_t.ticks());
1813 if (_selftimep != nullptr) {
1814 _selftimep->inc(selftime);
1815 }
1816 // add all class loading related event selftime to the accumulated time counter
1817 ClassLoader::perf_accumulated_time()->inc(selftime);
1818
1819 // reset the timer
1820 _timers[_event_type].reset();
1821 }