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