1 /*
2 * Copyright (c) 1997, 2025, 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 "cds/aotClassLocation.hpp"
26 #include "cds/cds_globals.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/dynamicArchive.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/classLoadInfo.hpp"
34 #include "classfile/javaClasses.hpp"
35 #include "classfile/klassFactory.hpp"
36 #include "classfile/moduleEntry.hpp"
37 #include "classfile/modules.hpp"
38 #include "classfile/packageEntry.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.hpp"
72 #include "runtime/timer.hpp"
73 #include "runtime/vm_version.hpp"
74 #include "services/management.hpp"
75 #include "services/threadService.hpp"
76 #include "utilities/checkedCast.hpp"
77 #include "utilities/classpathStream.hpp"
78 #include "utilities/events.hpp"
79 #include "utilities/macros.hpp"
80 #include "utilities/ostream.hpp"
81 #include "utilities/utf8.hpp"
82
83 #include <ctype.h>
84 #include <stdlib.h>
85
86 // Entry point in java.dll for path canonicalization
87
88 typedef int (*canonicalize_fn_t)(const char *orig, char *out, int len);
89
90 static canonicalize_fn_t CanonicalizeEntry = nullptr;
91
92 // Entry points for jimage.dll for loading jimage file entries
93
94 static JImageOpen_t JImageOpen = nullptr;
95 static JImageClose_t JImageClose = nullptr;
96 static JImageFindResource_t JImageFindResource = nullptr;
97 static JImageGetResource_t JImageGetResource = nullptr;
98
99 // JimageFile pointer, or null if exploded JDK build.
100 static JImageFile* JImage_file = nullptr;
101
102 // Globals
103
104 PerfCounter* ClassLoader::_perf_accumulated_time = nullptr;
105 PerfCounter* ClassLoader::_perf_classes_inited = nullptr;
106 PerfCounter* ClassLoader::_perf_class_init_time = nullptr;
107 PerfCounter* ClassLoader::_perf_class_init_selftime = nullptr;
108 PerfCounter* ClassLoader::_perf_classes_verified = nullptr;
109 PerfCounter* ClassLoader::_perf_class_verify_time = nullptr;
110 PerfCounter* ClassLoader::_perf_class_verify_selftime = nullptr;
111 PerfCounter* ClassLoader::_perf_classes_linked = nullptr;
112 PerfCounter* ClassLoader::_perf_class_link_time = nullptr;
113 PerfCounter* ClassLoader::_perf_class_link_selftime = nullptr;
114 PerfCounter* ClassLoader::_perf_shared_classload_time = nullptr;
115 PerfCounter* ClassLoader::_perf_sys_classload_time = nullptr;
116 PerfCounter* ClassLoader::_perf_app_classload_time = nullptr;
117 PerfCounter* ClassLoader::_perf_app_classload_selftime = nullptr;
118 PerfCounter* ClassLoader::_perf_app_classload_count = nullptr;
119 PerfCounter* ClassLoader::_perf_define_appclasses = nullptr;
120 PerfCounter* ClassLoader::_perf_define_appclass_time = nullptr;
121 PerfCounter* ClassLoader::_perf_define_appclass_selftime = nullptr;
122 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = nullptr;
123 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = nullptr;
124 PerfCounter* ClassLoader::_perf_ik_link_methods_time = nullptr;
125 PerfCounter* ClassLoader::_perf_method_adapters_time = nullptr;
126 PerfCounter* ClassLoader::_perf_ik_link_methods_count = nullptr;
127 PerfCounter* ClassLoader::_perf_method_adapters_count = nullptr;
128 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = nullptr;
129 PerfCounter* ClassLoader::_perf_secondary_hash_time = nullptr;
130
131 PerfCounter* ClassLoader::_perf_resolve_indy_time = nullptr;
132 PerfCounter* ClassLoader::_perf_resolve_invokehandle_time = nullptr;
133 PerfCounter* ClassLoader::_perf_resolve_mh_time = nullptr;
134 PerfCounter* ClassLoader::_perf_resolve_mt_time = nullptr;
135
136 PerfCounter* ClassLoader::_perf_resolve_indy_count = nullptr;
137 PerfCounter* ClassLoader::_perf_resolve_invokehandle_count = nullptr;
138 PerfCounter* ClassLoader::_perf_resolve_mh_count = nullptr;
139 PerfCounter* ClassLoader::_perf_resolve_mt_count = nullptr;
140
141 void ClassLoader::print_counters(outputStream *st) {
142 st->print_cr("ClassLoader:");
143 st->print_cr(" clinit: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", ClassLoader::class_init_time_ms(), ClassLoader::class_init_count());
144 st->print_cr(" link methods: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_ik_link_methods_time->get_value()) , _perf_ik_link_methods_count->get_value());
145 st->print_cr(" method adapters: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_method_adapters_time->get_value()) , _perf_method_adapters_count->get_value());
146 st->print_cr(" resolve...");
147 st->print_cr(" invokedynamic: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_resolve_indy_time->get_value()) , _perf_resolve_indy_count->get_value());
148 st->print_cr(" invokehandle: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_resolve_invokehandle_time->get_value()) , _perf_resolve_invokehandle_count->get_value());
149 st->print_cr(" CP_MethodHandle: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_resolve_mh_time->get_value()) , _perf_resolve_mh_count->get_value());
150 st->print_cr(" CP_MethodType: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_resolve_mt_time->get_value()) , _perf_resolve_mt_count->get_value());
151 st->cr();
152 }
153
154 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = nullptr;
155 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = nullptr;
156 ClassPathEntry* ClassLoader::_jrt_entry = nullptr;
157
158 ClassPathEntry* volatile ClassLoader::_first_append_entry_list = nullptr;
159 ClassPathEntry* volatile ClassLoader::_last_append_entry = nullptr;
160
161 // helper routines
162 #if INCLUDE_CDS
163 static bool string_starts_with(const char* str, const char* str_to_find) {
164 size_t str_len = strlen(str);
165 size_t str_to_find_len = strlen(str_to_find);
166 if (str_to_find_len > str_len) {
167 return false;
168 }
169 return (strncmp(str, str_to_find, str_to_find_len) == 0);
170 }
171 #endif
172
173 static const char* get_jimage_version_string() {
174 static char version_string[10] = "";
175 if (version_string[0] == '\0') {
176 jio_snprintf(version_string, sizeof(version_string), "%d.%d",
177 VM_Version::vm_major_version(), VM_Version::vm_minor_version());
178 }
179 return (const char*)version_string;
180 }
181
182 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
183 size_t str_len = strlen(str);
184 size_t str_to_find_len = strlen(str_to_find);
185 if (str_to_find_len > str_len) {
186 return false;
187 }
188 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
189 }
190
191 // Used to obtain the package name from a fully qualified class name.
192 Symbol* ClassLoader::package_from_class_name(const Symbol* name, bool* bad_class_name) {
193 if (name == nullptr) {
194 if (bad_class_name != nullptr) {
195 *bad_class_name = true;
196 }
197 return nullptr;
198 }
199
200 int utf_len = name->utf8_length();
201 const jbyte* base = (const jbyte*)name->base();
202 const jbyte* start = base;
203 const jbyte* end = UTF8::strrchr(start, utf_len, JVM_SIGNATURE_SLASH);
204 if (end == nullptr) {
205 return nullptr;
206 }
207 // Skip over '['s
208 if (*start == JVM_SIGNATURE_ARRAY) {
209 do {
210 start++;
211 } while (start < end && *start == JVM_SIGNATURE_ARRAY);
212
213 // Fully qualified class names should not contain a 'L'.
214 // Set bad_class_name to true to indicate that the package name
215 // could not be obtained due to an error condition.
216 // In this situation, is_same_class_package returns false.
217 if (*start == JVM_SIGNATURE_CLASS) {
218 if (bad_class_name != nullptr) {
219 *bad_class_name = true;
220 }
221 return nullptr;
222 }
223 }
224 // A class name could have just the slash character in the name,
225 // in which case start > end
226 if (start >= end) {
227 // No package name
228 if (bad_class_name != nullptr) {
229 *bad_class_name = true;
230 }
231 return nullptr;
232 }
233 return SymbolTable::new_symbol(name, pointer_delta_as_int(start, base), pointer_delta_as_int(end, base));
234 }
235
236 // Given a fully qualified package name, find its defining package in the class loader's
237 // package entry table.
238 PackageEntry* ClassLoader::get_package_entry(Symbol* pkg_name, ClassLoaderData* loader_data) {
239 if (pkg_name == nullptr) {
240 return nullptr;
241 }
242 PackageEntryTable* pkgEntryTable = loader_data->packages();
243 return pkgEntryTable->lookup_only(pkg_name);
244 }
245
246 const char* ClassPathEntry::copy_path(const char* path) {
247 char* copy = NEW_C_HEAP_ARRAY(char, strlen(path)+1, mtClass);
248 strcpy(copy, path);
249 return copy;
250 }
251
252 ClassPathDirEntry::~ClassPathDirEntry() {
253 FREE_C_HEAP_ARRAY(char, _dir);
254 }
255
256 ClassFileStream* ClassPathDirEntry::open_stream(JavaThread* current, const char* name) {
257 // construct full path name
258 assert((_dir != nullptr) && (name != nullptr), "sanity");
259 size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1;
260 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(current, char, path_len);
261 int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name);
262 assert(len == (int)(path_len - 1), "sanity");
263 // check if file exists
264 struct stat st;
265 if (os::stat(path, &st) == 0) {
266 // found file, open it
267 int file_handle = os::open(path, 0, 0);
268 if (file_handle != -1) {
269 // read contents into resource array
270 u1* buffer = NEW_RESOURCE_ARRAY_IN_THREAD(current, u1, st.st_size);
271 size_t num_read = ::read(file_handle, (char*) buffer, st.st_size);
272 // close file
273 ::close(file_handle);
274 // construct ClassFileStream
275 if (num_read == (size_t)st.st_size) {
276 if (UsePerfData) {
277 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
278 }
279 #ifdef ASSERT
280 // Freeing path is a no-op here as buffer prevents it from being reclaimed. But we keep it for
281 // debug builds so that we guard against use-after-free bugs.
282 FREE_RESOURCE_ARRAY_IN_THREAD(current, char, path, path_len);
283 #endif
284 // We don't verify the length of the classfile stream fits in an int, but this is the
285 // bootloader so we have control of this.
286 // Resource allocated
287 return new ClassFileStream(buffer,
288 checked_cast<int>(st.st_size),
289 _dir);
290 }
291 }
292 }
293 FREE_RESOURCE_ARRAY_IN_THREAD(current, char, path, path_len);
294 return nullptr;
295 }
296
297 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() {
298 _zip = zip;
299 _zip_name = copy_path(zip_name);
300 }
301
302 ClassPathZipEntry::~ClassPathZipEntry() {
303 ZipLibrary::close(_zip);
304 FREE_C_HEAP_ARRAY(char, _zip_name);
305 }
306
307 bool ClassPathZipEntry::has_entry(JavaThread* current, const char* name) {
308 ThreadToNativeFromVM ttn(current);
309 // check whether zip archive contains name
310 jint name_len;
311 jint filesize;
312 jzentry* entry = ZipLibrary::find_entry(_zip, name, &filesize, &name_len);
313 if (entry == nullptr) {
314 return false;
315 } else {
316 ZipLibrary::free_entry(_zip, entry);
317 return true;
318 }
319 }
320
321 u1* ClassPathZipEntry::open_entry(JavaThread* current, const char* name, jint* filesize, bool nul_terminate) {
322 // enable call to C land
323 ThreadToNativeFromVM ttn(current);
324 // check whether zip archive contains name
325 jint name_len;
326 jzentry* entry = ZipLibrary::find_entry(_zip, name, filesize, &name_len);
327 if (entry == nullptr) return nullptr;
328 u1* buffer;
329 char name_buf[128];
330 char* filename;
331 if (name_len < 128) {
332 filename = name_buf;
333 } else {
334 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
335 }
336
337 // read contents into resource array
338 size_t size = (uint32_t)(*filesize);
339 if (nul_terminate) {
340 if (sizeof(size) == sizeof(uint32_t) && size == UINT_MAX) {
341 return nullptr; // 32-bit integer overflow will occur.
342 }
343 size++;
344 }
345 buffer = NEW_RESOURCE_ARRAY(u1, size);
346 if (!ZipLibrary::read_entry(_zip, entry, buffer, filename)) {
347 return nullptr;
348 }
349
350 // return result
351 if (nul_terminate) {
352 buffer[size - 1] = 0;
353 }
354 return buffer;
355 }
356
357 ClassFileStream* ClassPathZipEntry::open_stream(JavaThread* current, const char* name) {
358 jint filesize;
359 u1* buffer = open_entry(current, name, &filesize, false);
360 if (buffer == nullptr) {
361 return nullptr;
362 }
363 if (UsePerfData) {
364 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
365 }
366 // Resource allocated
367 return new ClassFileStream(buffer,
368 filesize,
369 _zip_name);
370 }
371
372 DEBUG_ONLY(ClassPathImageEntry* ClassPathImageEntry::_singleton = nullptr;)
373
374 JImageFile* ClassPathImageEntry::jimage() const {
375 return JImage_file;
376 }
377
378 JImageFile* ClassPathImageEntry::jimage_non_null() const {
379 assert(ClassLoader::has_jrt_entry(), "must be");
380 assert(jimage() != nullptr, "should have been opened by ClassLoader::lookup_vm_options "
381 "and remained throughout normal JVM lifetime");
382 return jimage();
383 }
384
385 void ClassPathImageEntry::close_jimage() {
386 if (jimage() != nullptr) {
387 (*JImageClose)(jimage());
388 JImage_file = nullptr;
389 }
390 }
391
392 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
393 ClassPathEntry() {
394 guarantee(jimage != nullptr, "jimage file is null");
395 guarantee(name != nullptr, "jimage file name is null");
396 assert(_singleton == nullptr, "VM supports only one jimage");
397 DEBUG_ONLY(_singleton = this);
398 size_t len = strlen(name) + 1;
399 _name = copy_path(name);
400 }
401
402 ClassFileStream* ClassPathImageEntry::open_stream(JavaThread* current, const char* name) {
403 return open_stream_for_loader(current, name, ClassLoaderData::the_null_class_loader_data());
404 }
405
406 // For a class in a named module, look it up in the jimage file using this syntax:
407 // /<module-name>/<package-name>/<base-class>
408 //
409 // Assumptions:
410 // 1. There are no unnamed modules in the jimage file.
411 // 2. A package is in at most one module in the jimage file.
412 //
413 ClassFileStream* ClassPathImageEntry::open_stream_for_loader(JavaThread* current, const char* name, ClassLoaderData* loader_data) {
414 jlong size;
415 JImageLocationRef location = 0;
416
417 TempNewSymbol class_name = SymbolTable::new_symbol(name);
418 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name);
419
420 if (pkg_name != nullptr) {
421 if (!Universe::is_module_initialized()) {
422 location = (*JImageFindResource)(jimage_non_null(), JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
423 } else {
424 PackageEntry* package_entry = ClassLoader::get_package_entry(pkg_name, loader_data);
425 if (package_entry != nullptr) {
426 ResourceMark rm(current);
427 // Get the module name
428 ModuleEntry* module = package_entry->module();
429 assert(module != nullptr, "Boot classLoader package missing module");
430 assert(module->is_named(), "Boot classLoader package is in unnamed module");
431 const char* module_name = module->name()->as_C_string();
432 if (module_name != nullptr) {
433 location = (*JImageFindResource)(jimage_non_null(), module_name, get_jimage_version_string(), name, &size);
434 }
435 }
436 }
437 }
438
439 if (location != 0) {
440 if (UsePerfData) {
441 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
442 }
443 char* data = NEW_RESOURCE_ARRAY(char, size);
444 (*JImageGetResource)(jimage_non_null(), location, data, size);
445 // Resource allocated
446 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be");
447 return new ClassFileStream((u1*)data,
448 checked_cast<int>(size),
449 _name,
450 true); // from_boot_loader_modules_image
451 }
452
453 return nullptr;
454 }
455
456 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
457 const char* module_name,
458 const char* file_name,
459 jlong &size) {
460 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
461 }
462
463 bool ClassPathImageEntry::is_modules_image() const {
464 assert(this == _singleton, "VM supports a single jimage");
465 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be used for jrt entry");
466 return true;
467 }
468
469 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
470 _module_name = module_name;
471 _module_first_entry = nullptr;
472 _module_last_entry = nullptr;
473 }
474
475 ModuleClassPathList::~ModuleClassPathList() {
476 // Clean out each ClassPathEntry on list
477 ClassPathEntry* e = _module_first_entry;
478 while (e != nullptr) {
479 ClassPathEntry* next_entry = e->next();
480 delete e;
481 e = next_entry;
482 }
483 }
484
485 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
486 if (new_entry != nullptr) {
487 if (_module_last_entry == nullptr) {
488 _module_first_entry = _module_last_entry = new_entry;
489 } else {
490 _module_last_entry->set_next(new_entry);
491 _module_last_entry = new_entry;
492 }
493 }
494 }
495
496 void ClassLoader::trace_class_path(const char* msg, const char* name) {
497 LogTarget(Info, class, path) lt;
498 if (lt.is_enabled()) {
499 LogStream ls(lt);
500 if (msg) {
501 ls.print("%s", msg);
502 }
503 if (name) {
504 if (strlen(name) < 256) {
505 ls.print("%s", name);
506 } else {
507 // For very long paths, we need to print each character separately,
508 // as print_cr() has a length limit
509 while (name[0] != '\0') {
510 ls.print("%c", name[0]);
511 name++;
512 }
513 }
514 }
515 ls.cr();
516 }
517 }
518
519 void ClassLoader::setup_bootstrap_search_path(JavaThread* current) {
520 const char* bootcp = Arguments::get_boot_class_path();
521 assert(bootcp != nullptr, "Boot class path must not be nullptr");
522 if (PrintSharedArchiveAndExit) {
523 // Don't print bootcp - this is the bootcp of this current VM process, not necessarily
524 // the same as the boot classpath of the shared archive.
525 } else {
526 trace_class_path("bootstrap loader class path=", bootcp);
527 }
528 setup_bootstrap_search_path_impl(current, bootcp);
529 }
530
531 void ClassLoader::close_jrt_image() {
532 // Not applicable for exploded builds
533 if (!ClassLoader::has_jrt_entry()) return;
534 _jrt_entry->close_jimage();
535 }
536
537 // Construct the array of module/path pairs as specified to --patch-module
538 // for the boot loader to search ahead of the jimage, if the class being
539 // loaded is defined to a module that has been specified to --patch-module.
540 void ClassLoader::setup_patch_mod_entries() {
541 JavaThread* current = JavaThread::current();
542 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
543 int num_of_entries = patch_mod_args->length();
544
545 // Set up the boot loader's _patch_mod_entries list
546 _patch_mod_entries = new (mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, mtModule);
547
548 for (int i = 0; i < num_of_entries; i++) {
549 const char* module_name = (patch_mod_args->at(i))->module_name();
550 Symbol* const module_sym = SymbolTable::new_symbol(module_name);
551 assert(module_sym != nullptr, "Failed to obtain Symbol for module name");
552 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
553
554 char* class_path = (patch_mod_args->at(i))->path_string();
555 ResourceMark rm(current);
556 ClasspathStream cp_stream(class_path);
557
558 while (cp_stream.has_next()) {
559 const char* path = cp_stream.get_next();
560 struct stat st;
561 if (os::stat(path, &st) == 0) {
562 // File or directory found
563 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st);
564 // If the path specification is valid, enter it into this module's list
565 if (new_entry != nullptr) {
566 module_cpl->add_to_list(new_entry);
567 }
568 }
569 }
570
571 // Record the module into the list of --patch-module entries only if
572 // valid ClassPathEntrys have been created
573 if (module_cpl->module_first_entry() != nullptr) {
574 _patch_mod_entries->push(module_cpl);
575 }
576 }
577 }
578
579 // Determine whether the module has been patched via the command-line
580 // option --patch-module
581 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
582 if (_patch_mod_entries != nullptr && _patch_mod_entries->is_nonempty()) {
583 int table_len = _patch_mod_entries->length();
584 for (int i = 0; i < table_len; i++) {
585 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
586 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
587 return true;
588 }
589 }
590 }
591 return false;
592 }
593
594 // Set up the _jrt_entry if present and boot append path
595 void ClassLoader::setup_bootstrap_search_path_impl(JavaThread* current, const char *class_path) {
596 ResourceMark rm(current);
597 ClasspathStream cp_stream(class_path);
598 bool set_base_piece = true;
599
600 #if INCLUDE_CDS
601 if (CDSConfig::is_dumping_archive()) {
602 if (!Arguments::has_jimage()) {
603 vm_exit_during_initialization("CDS is not supported in exploded JDK build", nullptr);
604 }
605 }
606 #endif
607
608 while (cp_stream.has_next()) {
609 const char* path = cp_stream.get_next();
610
611 if (set_base_piece) {
612 // The first time through the bootstrap_search setup, it must be determined
613 // what the base or core piece of the boot loader search is. Either a java runtime
614 // image is present or this is an exploded module build situation.
615 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
616 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
617 struct stat st;
618 if (os::stat(path, &st) == 0) {
619 // Directory found
620 if (JImage_file != nullptr) {
621 assert(Arguments::has_jimage(), "sanity check");
622 const char* canonical_path = get_canonical_path(path, current);
623 assert(canonical_path != nullptr, "canonical_path issue");
624
625 _jrt_entry = new ClassPathImageEntry(JImage_file, canonical_path);
626 assert(_jrt_entry != nullptr && _jrt_entry->is_modules_image(), "No java runtime image present");
627 assert(_jrt_entry->jimage() != nullptr, "No java runtime image");
628 } // else it's an exploded build.
629 } else {
630 // If path does not exist, exit
631 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
632 }
633 set_base_piece = false;
634 } else {
635 // Every entry on the boot class path after the initial base piece,
636 // which is set by os::set_boot_path(), is considered an appended entry.
637 update_class_path_entry_list(current, path);
638 }
639 }
640 }
641
642 // Gets the exploded path for the named module. The memory for the path
643 // is allocated on the C heap if `c_heap` is true otherwise in the resource area.
644 static const char* get_exploded_module_path(const char* module_name, bool c_heap) {
645 const char *home = Arguments::get_java_home();
646 const char file_sep = os::file_separator()[0];
647 // 10 represents the length of "modules" + 2 file separators + \0
648 size_t len = strlen(home) + strlen(module_name) + 10;
649 char *path = c_heap ? NEW_C_HEAP_ARRAY(char, len, mtModule) : NEW_RESOURCE_ARRAY(char, len);
650 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
651 return path;
652 }
653
654 // During an exploded modules build, each module defined to the boot loader
655 // will be added to the ClassLoader::_exploded_entries array.
656 void ClassLoader::add_to_exploded_build_list(JavaThread* current, Symbol* module_sym) {
657 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
658 assert(_exploded_entries != nullptr, "_exploded_entries was not initialized");
659
660 // Find the module's symbol
661 ResourceMark rm(current);
662 const char *module_name = module_sym->as_C_string();
663 const char *path = get_exploded_module_path(module_name, false);
664
665 struct stat st;
666 if (os::stat(path, &st) == 0) {
667 // Directory found
668 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st);
669
670 // If the path specification is valid, enter it into this module's list.
671 // There is no need to check for duplicate modules in the exploded entry list,
672 // since no two modules with the same name can be defined to the boot loader.
673 // This is checked at module definition time in Modules::define_module.
674 if (new_entry != nullptr) {
675 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
676 module_cpl->add_to_list(new_entry);
677 {
678 MutexLocker ml(current, Module_lock);
679 _exploded_entries->push(module_cpl);
680 }
681 log_info(class, load)("path: %s", path);
682 }
683 }
684 }
685
686 jzfile* ClassLoader::open_zip_file(const char* canonical_path, char** error_msg, JavaThread* thread) {
687 // enable call to C land
688 ThreadToNativeFromVM ttn(thread);
689 HandleMark hm(thread);
690 return ZipLibrary::open(canonical_path, error_msg);
691 }
692
693 ClassPathEntry* ClassLoader::create_class_path_entry(JavaThread* current,
694 const char *path, const struct stat* st) {
695 ClassPathEntry* new_entry = nullptr;
696 if ((st->st_mode & S_IFMT) == S_IFREG) {
697 ResourceMark rm(current);
698 // Regular file, should be a zip file
699 // Canonicalized filename
700 const char* canonical_path = get_canonical_path(path, current);
701 if (canonical_path == nullptr) {
702 return nullptr;
703 }
704 char* error_msg = nullptr;
705 jzfile* zip = open_zip_file(canonical_path, &error_msg, current);
706 if (zip != nullptr && error_msg == nullptr) {
707 new_entry = new ClassPathZipEntry(zip, path);
708 } else {
709 return nullptr;
710 }
711 log_info(class, path)("opened: %s", path);
712 log_info(class, load)("opened: %s", path);
713 } else {
714 // Directory
715 new_entry = new ClassPathDirEntry(path);
716 log_info(class, load)("path: %s", path);
717 }
718 return new_entry;
719 }
720
721
722 // Create a class path zip entry for a given path (return null if not found
723 // or zip/JAR file cannot be opened)
724 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
725 // check for a regular file
726 struct stat st;
727 if (os::stat(path, &st) == 0) {
728 if ((st.st_mode & S_IFMT) == S_IFREG) {
729 JavaThread* thread = JavaThread::current();
730 ResourceMark rm(thread);
731 const char* canonical_path = get_canonical_path(path, thread);
732 if (canonical_path != nullptr) {
733 char* error_msg = nullptr;
734 jzfile* zip = open_zip_file(canonical_path, &error_msg, thread);
735 if (zip != nullptr && error_msg == nullptr) {
736 // create using canonical path
737 return new ClassPathZipEntry(zip, canonical_path);
738 }
739 }
740 }
741 }
742 return nullptr;
743 }
744
745 // The boot append entries are added with a lock, and read lock free.
746 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
747 if (new_entry != nullptr) {
748 MutexLocker ml(Bootclasspath_lock, Mutex::_no_safepoint_check_flag);
749 if (_last_append_entry == nullptr) {
750 _last_append_entry = new_entry;
751 assert(first_append_entry() == nullptr, "boot loader's append class path entry list not empty");
752 AtomicAccess::release_store(&_first_append_entry_list, new_entry);
753 } else {
754 _last_append_entry->set_next(new_entry);
755 _last_append_entry = new_entry;
756 }
757 }
758 }
759
760 // Returns true IFF the file/dir exists and the entry was successfully created.
761 bool ClassLoader::update_class_path_entry_list(JavaThread* current, const char *path) {
762 struct stat st;
763 if (os::stat(path, &st) == 0) {
764 // File or directory found
765 ClassPathEntry* new_entry = nullptr;
766 new_entry = create_class_path_entry(current, path, &st);
767 if (new_entry == nullptr) {
768 return false;
769 }
770
771 // Do not reorder the bootclasspath which would break get_system_package().
772 // Add new entry to linked list
773 add_to_boot_append_entries(new_entry);
774 return true;
775 } else {
776 return false;
777 }
778 }
779
780 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
781 ResourceMark rm;
782 int num_of_entries = module_list->length();
783 for (int i = 0; i < num_of_entries; i++) {
784 ClassPathEntry* e;
785 ModuleClassPathList* mpl = module_list->at(i);
786 tty->print("%s=", mpl->module_name()->as_C_string());
787 e = mpl->module_first_entry();
788 while (e != nullptr) {
789 tty->print("%s", e->name());
790 e = e->next();
791 if (e != nullptr) {
792 tty->print("%s", os::path_separator());
793 }
794 }
795 tty->print(" ;");
796 }
797 }
798
799 void ClassLoader::print_bootclasspath() {
800 ClassPathEntry* e;
801 tty->print("[bootclasspath= ");
802
803 // Print --patch-module module/path specifications first
804 if (_patch_mod_entries != nullptr) {
805 print_module_entry_table(_patch_mod_entries);
806 }
807
808 // [jimage | exploded modules build]
809 if (has_jrt_entry()) {
810 // Print the location of the java runtime image
811 tty->print("%s ;", _jrt_entry->name());
812 } else {
813 // Print exploded module build path specifications
814 if (_exploded_entries != nullptr) {
815 print_module_entry_table(_exploded_entries);
816 }
817 }
818
819 // appended entries
820 e = first_append_entry();
821 while (e != nullptr) {
822 tty->print("%s ;", e->name());
823 e = e->next();
824 }
825 tty->print_cr("]");
826 }
827
828 void* ClassLoader::dll_lookup(void* lib, const char* name, const char* path) {
829 void* func = os::dll_lookup(lib, name);
830 if (func == nullptr) {
831 char msg[256] = "";
832 jio_snprintf(msg, sizeof(msg), "Could not resolve \"%s\"", name);
833 vm_exit_during_initialization(msg, path);
834 }
835 return func;
836 }
837
838 void ClassLoader::load_java_library() {
839 assert(CanonicalizeEntry == nullptr, "should not load java library twice");
840 if (is_vm_statically_linked()) {
841 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, os::lookup_function("JDK_Canonicalize"));
842 assert(CanonicalizeEntry != nullptr, "could not lookup JDK_Canonicalize");
843 return;
844 }
845
846 void *javalib_handle = os::native_java_library();
847 if (javalib_handle == nullptr) {
848 vm_exit_during_initialization("Unable to load java library", nullptr);
849 }
850
851 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, dll_lookup(javalib_handle, "JDK_Canonicalize", nullptr));
852 assert(CanonicalizeEntry != nullptr, "could not lookup JDK_Canonicalize in java library");
853 }
854
855 void ClassLoader::load_jimage_library() {
856 assert(JImageOpen == nullptr, "should not load jimage library twice");
857
858 if (is_vm_statically_linked()) {
859 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, os::lookup_function("JIMAGE_Open"));
860 JImageClose = CAST_TO_FN_PTR(JImageClose_t, os::lookup_function("JIMAGE_Close"));
861 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, os::lookup_function("JIMAGE_FindResource"));
862 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, os::lookup_function("JIMAGE_GetResource"));
863 assert(JImageOpen != nullptr && JImageClose != nullptr &&
864 JImageFindResource != nullptr && JImageGetResource != nullptr,
865 "could not lookup all jimage library functions");
866 return;
867 }
868
869 char path[JVM_MAXPATHLEN];
870 char ebuf[1024];
871 void* handle = nullptr;
872 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
873 handle = os::dll_load(path, ebuf, sizeof ebuf);
874 }
875 if (handle == nullptr) {
876 vm_exit_during_initialization("Unable to load jimage library", path);
877 }
878
879 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, dll_lookup(handle, "JIMAGE_Open", path));
880 JImageClose = CAST_TO_FN_PTR(JImageClose_t, dll_lookup(handle, "JIMAGE_Close", path));
881 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, dll_lookup(handle, "JIMAGE_FindResource", path));
882 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, dll_lookup(handle, "JIMAGE_GetResource", path));
883 assert(JImageOpen != nullptr && JImageClose != nullptr &&
884 JImageFindResource != nullptr && JImageGetResource != nullptr,
885 "could not lookup all jimage library functions in jimage library");
886 }
887
888 int ClassLoader::crc32(int crc, const char* buf, int len) {
889 return ZipLibrary::crc32(crc, (const jbyte*)buf, len);
890 }
891
892 oop ClassLoader::get_system_package(const char* name, TRAPS) {
893 // Look up the name in the boot loader's package entry table.
894 if (name != nullptr) {
895 TempNewSymbol package_sym = SymbolTable::new_symbol(name);
896 // Look for the package entry in the boot loader's package entry table.
897 PackageEntry* package =
898 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
899
900 // Return null if package does not exist or if no classes in that package
901 // have been loaded.
902 if (package != nullptr && package->has_loaded_class()) {
903 ModuleEntry* module = package->module();
904 if (module->location() != nullptr) {
905 ResourceMark rm(THREAD);
906 Handle ml = java_lang_String::create_from_str(
907 module->location()->as_C_string(), THREAD);
908 return ml();
909 }
910 // Return entry on boot loader class path.
911 Handle cph = java_lang_String::create_from_str(
912 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
913 return cph();
914 }
915 }
916 return nullptr;
917 }
918
919 objArrayOop ClassLoader::get_system_packages(TRAPS) {
920 ResourceMark rm(THREAD);
921 // List of pointers to PackageEntrys that have loaded classes.
922 PackageEntryTable* pe_table =
923 ClassLoaderData::the_null_class_loader_data()->packages();
924 GrowableArray<PackageEntry*>* loaded_class_pkgs = pe_table->get_system_packages();
925
926 // Allocate objArray and fill with java.lang.String
927 objArrayOop r = oopFactory::new_objArray(vmClasses::String_klass(),
928 loaded_class_pkgs->length(), CHECK_NULL);
929 objArrayHandle result(THREAD, r);
930 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
931 PackageEntry* package_entry = loaded_class_pkgs->at(x);
932 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
933 result->obj_at_put(x, str());
934 }
935 return result();
936 }
937
938 // caller needs ResourceMark
939 const char* ClassLoader::file_name_for_class_name(const char* class_name,
940 int class_name_len) {
941 assert(class_name != nullptr, "invariant");
942 assert((int)strlen(class_name) == class_name_len, "invariant");
943
944 static const char class_suffix[] = ".class";
945 size_t class_suffix_len = sizeof(class_suffix);
946
947 char* const file_name = NEW_RESOURCE_ARRAY(char,
948 class_name_len +
949 class_suffix_len); // includes term null
950
951 strncpy(file_name, class_name, class_name_len);
952 strncpy(&file_name[class_name_len], class_suffix, class_suffix_len);
953
954 return file_name;
955 }
956
957 static ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
958 const GrowableArray<ModuleClassPathList*>* const module_list) {
959 int num_of_entries = module_list->length();
960 const Symbol* class_module_name = mod_entry->name();
961
962 // Loop through all the modules in either the patch-module or exploded entries looking for module
963 for (int i = 0; i < num_of_entries; i++) {
964 ModuleClassPathList* module_cpl = module_list->at(i);
965 Symbol* module_cpl_name = module_cpl->module_name();
966
967 if (module_cpl_name->fast_compare(class_module_name) == 0) {
968 // Class' module has been located.
969 return module_cpl->module_first_entry();
970 }
971 }
972 return nullptr;
973 }
974
975
976 // Search the module list for the class file stream based on the file name and java package
977 ClassFileStream* ClassLoader::search_module_entries(JavaThread* current,
978 const GrowableArray<ModuleClassPathList*>* const module_list,
979 PackageEntry* pkg_entry, // Java package entry derived from the class name
980 const char* const file_name) {
981 ClassFileStream* stream = nullptr;
982
983 // Find the defining module in the boot loader's module entry table
984 ModuleEntry* mod_entry = (pkg_entry != nullptr) ? pkg_entry->module() : nullptr;
985
986 // If the module system has not defined java.base yet, then
987 // classes loaded are assumed to be defined to java.base.
988 // When java.base is eventually defined by the module system,
989 // all packages of classes that have been previously loaded
990 // are verified in ModuleEntryTable::verify_javabase_packages().
991 if (!Universe::is_module_initialized() &&
992 !ModuleEntryTable::javabase_defined() &&
993 mod_entry == nullptr) {
994 mod_entry = ModuleEntryTable::javabase_moduleEntry();
995 }
996
997 // The module must be a named module
998 ClassPathEntry* e = nullptr;
999 if (mod_entry != nullptr && mod_entry->is_named()) {
1000 if (module_list == _exploded_entries) {
1001 // The exploded build entries can be added to at any time so a lock is
1002 // needed when searching them.
1003 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1004 MutexLocker ml(current, Module_lock);
1005 e = find_first_module_cpe(mod_entry, module_list);
1006 } else {
1007 e = find_first_module_cpe(mod_entry, module_list);
1008 }
1009 }
1010
1011 // Try to load the class from the module's ClassPathEntry list.
1012 while (e != nullptr) {
1013 stream = e->open_stream(current, file_name);
1014 // No context.check is required since CDS is not supported
1015 // for an exploded modules build or if --patch-module is specified.
1016 if (nullptr != stream) {
1017 return stream;
1018 }
1019 e = e->next();
1020 }
1021 // If the module was located, break out even if the class was not
1022 // located successfully from that module's ClassPathEntry list.
1023 // There will not be another valid entry for that module.
1024 return nullptr;
1025 }
1026
1027 // Called by the boot classloader to load classes
1028 InstanceKlass* ClassLoader::load_class(Symbol* name, PackageEntry* pkg_entry, bool search_append_only, TRAPS) {
1029 assert(name != nullptr, "invariant");
1030
1031 ResourceMark rm(THREAD);
1032 HandleMark hm(THREAD);
1033
1034 const char* const class_name = name->as_C_string();
1035
1036 EventMarkClassLoading m("Loading class %s", class_name);
1037
1038 const char* const file_name = file_name_for_class_name(class_name,
1039 name->utf8_length());
1040 assert(file_name != nullptr, "invariant");
1041
1042 // Lookup stream for parsing .class file
1043 ClassFileStream* stream = nullptr;
1044 s2 classpath_index = 0;
1045 ClassPathEntry* e = nullptr;
1046
1047 // If search_append_only is true, boot loader visibility boundaries are
1048 // set to be _first_append_entry to the end. This includes:
1049 // [-Xbootclasspath/a]; [jvmti appended entries]
1050 //
1051 // If search_append_only is false, boot loader visibility boundaries are
1052 // set to be the --patch-module entries plus the base piece. This includes:
1053 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1054 //
1055
1056 // Load Attempt #1: --patch-module
1057 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1058 // attempt to load the class from those locations specific to the module.
1059 // Specifications to --patch-module can contain a partial number of classes
1060 // that are part of the overall module definition. So if a particular class is not
1061 // found within its module specification, the search should continue to Load Attempt #2.
1062 // Note: The --patch-module entries are never searched if the boot loader's
1063 // visibility boundary is limited to only searching the append entries.
1064 if (_patch_mod_entries != nullptr && !search_append_only) {
1065 assert(!CDSConfig::is_dumping_archive(), "CDS doesn't support --patch-module during dumping");
1066 stream = search_module_entries(THREAD, _patch_mod_entries, pkg_entry, file_name);
1067 }
1068
1069 // Load Attempt #2: [jimage | exploded build]
1070 if (!search_append_only && (nullptr == stream)) {
1071 if (has_jrt_entry()) {
1072 e = _jrt_entry;
1073 stream = _jrt_entry->open_stream(THREAD, file_name);
1074 } else {
1075 // Exploded build - attempt to locate class in its defining module's location.
1076 assert(_exploded_entries != nullptr, "No exploded build entries present");
1077 assert(!CDSConfig::is_dumping_archive(), "CDS dumping doesn't support exploded build");
1078 stream = search_module_entries(THREAD, _exploded_entries, pkg_entry, file_name);
1079 }
1080 }
1081
1082 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1083 if (search_append_only && (nullptr == stream)) {
1084 // For the boot loader append path search, the starting classpath_index
1085 // for the appended piece is always 1 to account for either the
1086 // _jrt_entry or the _exploded_entries.
1087 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1088 classpath_index = 1;
1089
1090 e = first_append_entry();
1091 while (e != nullptr) {
1092 stream = e->open_stream(THREAD, file_name);
1093 if (nullptr != stream) {
1094 break;
1095 }
1096 e = e->next();
1097 ++classpath_index;
1098 }
1099 }
1100
1101 if (nullptr == stream) {
1102 return nullptr;
1103 }
1104
1105 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1106 Handle protection_domain;
1107 ClassLoadInfo cl_info(protection_domain);
1108
1109 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1110 name,
1111 loader_data,
1112 cl_info,
1113 CHECK_NULL);
1114 result->set_classpath_index(classpath_index);
1115 return result;
1116 }
1117
1118 #if INCLUDE_CDS
1119 static const char* skip_uri_protocol(const char* source) {
1120 if (strncmp(source, "file:", 5) == 0) {
1121 // file: protocol path could start with file:/ or file:///
1122 // locate the char after all the forward slashes
1123 int offset = 5;
1124 while (*(source + offset) == '/') {
1125 offset++;
1126 }
1127 source += offset;
1128 // for non-windows platforms, move back one char as the path begins with a '/'
1129 #ifndef _WINDOWS
1130 source -= 1;
1131 #endif
1132 } else if (strncmp(source, "jrt:/", 5) == 0) {
1133 source += 5;
1134 }
1135 return source;
1136 }
1137
1138 static char decode_percent_encoded(const char *str, size_t& index) {
1139 if (str[index] == '%'
1140 && isxdigit(str[index + 1])
1141 && isxdigit(str[index + 2])) {
1142 char hex[3];
1143 hex[0] = str[index + 1];
1144 hex[1] = str[index + 2];
1145 hex[2] = '\0';
1146 index += 2;
1147 return (char) strtol(hex, nullptr, 16);
1148 }
1149 return str[index];
1150 }
1151
1152 char* ClassLoader::uri_to_path(const char* uri) {
1153 const size_t len = strlen(uri) + 1;
1154 char* path = NEW_RESOURCE_ARRAY(char, len);
1155
1156 uri = skip_uri_protocol(uri);
1157
1158 if (strncmp(uri, "//", 2) == 0) {
1159 // Skip the empty "authority" part
1160 uri += 2;
1161 }
1162
1163 #ifdef _WINDOWS
1164 if (uri[0] == '/') {
1165 // Absolute path name on Windows does not begin with a slash
1166 uri += 1;
1167 }
1168 #endif
1169
1170 size_t path_index = 0;
1171 for (size_t i = 0; i < strlen(uri); ++i) {
1172 char decoded = decode_percent_encoded(uri, i);
1173 path[path_index++] = decoded;
1174 }
1175 path[path_index] = '\0';
1176 return path;
1177 }
1178
1179 // Record the shared classpath index and loader type for classes loaded
1180 // by the builtin loaders at dump time.
1181 void ClassLoader::record_result(JavaThread* current, InstanceKlass* ik,
1182 const ClassFileStream* stream, bool redefined) {
1183 assert(CDSConfig::is_dumping_archive(), "sanity");
1184 assert(stream != nullptr, "sanity");
1185
1186 if (ik->is_hidden()) {
1187 record_hidden_class(ik);
1188 return;
1189 }
1190
1191 oop loader = ik->class_loader();
1192 char* src = (char*)stream->source();
1193 if (src == nullptr) {
1194 ik->set_shared_classpath_index(-1); // unsupported location
1195 return;
1196 }
1197
1198 if (!SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
1199 // A class loaded by a user-defined classloader.
1200 assert(ik->shared_classpath_index() < 0, "not assigned yet");
1201 ik->set_shared_classpath_index(UNREGISTERED_INDEX);
1202 SystemDictionaryShared::set_shared_class_misc_info(ik, (ClassFileStream*)stream);
1203 return;
1204 }
1205
1206 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1207
1208 ResourceMark rm(current);
1209 int classpath_index = -1;
1210 bool found_invalid = false;
1211
1212 PackageEntry* pkg_entry = ik->package();
1213
1214 if (!AOTClassLocationConfig::dumptime_is_ready()) {
1215 // The shared path table is set up after module system initialization.
1216 // The path table contains no entry before that. Any classes loaded prior
1217 // to the setup of the shared path table must be from the modules image.
1218 assert(stream->from_boot_loader_modules_image(), "stream must be loaded by boot loader from modules image");
1219 classpath_index = 0;
1220 } else {
1221 // Save the path from the file: protocol or the module name from the jrt: protocol
1222 // if no protocol prefix is found, path is the same as stream->source(). This path
1223 // must be valid since the class has been successfully parsed.
1224 const char* path = ClassLoader::uri_to_path(src);
1225 assert(path != nullptr, "sanity");
1226 AOTClassLocationConfig::dumptime_iterate([&] (AOTClassLocation* cl) {
1227 int i = cl->index();
1228 // for index 0 and the stream->source() is the modules image or has the jrt: protocol.
1229 // The class must be from the runtime modules image.
1230 if (cl->is_modules_image() && (stream->from_boot_loader_modules_image() || string_starts_with(src, "jrt:"))) {
1231 classpath_index = i;
1232 } else if (os::same_files(cl->path(), path)) {
1233 // If the path (from the class stream source) is the same as the shared
1234 // class or module path, then we have a match.
1235 // src may come from the App/Platform class loaders, which would canonicalize
1236 // the file name. We cannot use strcmp to check for equality against cs->path().
1237 // We must use os::same_files (which is faster than canonicalizing cs->path()).
1238
1239 // null pkg_entry and pkg_entry in an unnamed module implies the class
1240 // is from the -cp or boot loader append path which consists of -Xbootclasspath/a
1241 // and jvmti appended entries.
1242 if ((pkg_entry == nullptr) || (pkg_entry->in_unnamed_module())) {
1243 // Ensure the index is within the -cp range before assigning
1244 // to the classpath_index.
1245 if (SystemDictionary::is_system_class_loader(loader) && cl->from_app_classpath()) {
1246 classpath_index = i;
1247 } else {
1248 if (cl->from_boot_classpath()) {
1249 if (loader != nullptr) {
1250 // Probably loaded by jdk/internal/loader/ClassLoaders$BootClassLoader. Don't archive
1251 // such classes.
1252 found_invalid = true;
1253 } else {
1254 classpath_index = i;
1255 }
1256 }
1257 }
1258 } else {
1259 // A class from a named module from the --module-path. Ensure the index is
1260 // within the --module-path range before assigning to the classpath_index.
1261 if ((pkg_entry != nullptr) && !(pkg_entry->in_unnamed_module()) && cl->from_module_path()) {
1262 classpath_index = i;
1263 }
1264 }
1265 }
1266 if (classpath_index >= 0 || found_invalid) {
1267 return false; // Break the AOTClassLocationConfig::dumptime_iterate() loop.
1268 } else {
1269 return true; // Keep iterating
1270 }
1271 });
1272 }
1273
1274 if (found_invalid) {
1275 assert(classpath_index == -1, "sanity");
1276 }
1277
1278 const char* const class_name = ik->name()->as_C_string();
1279 const char* const file_name = file_name_for_class_name(class_name,
1280 ik->name()->utf8_length());
1281 assert(file_name != nullptr, "invariant");
1282 record_result_for_builtin_loader(checked_cast<s2>(classpath_index), ik, redefined);
1283 }
1284
1285 void ClassLoader::record_result_for_builtin_loader(s2 classpath_index, InstanceKlass* result, bool redefined) {
1286 assert(CDSConfig::is_dumping_archive(), "sanity");
1287
1288 oop loader = result->class_loader();
1289 if (SystemDictionary::is_system_class_loader(loader)) {
1290 AOTClassLocationConfig::dumptime_set_has_app_classes();
1291 } else if (SystemDictionary::is_platform_class_loader(loader)) {
1292 AOTClassLocationConfig::dumptime_set_has_platform_classes();
1293 } else {
1294 precond(loader == nullptr);
1295 }
1296
1297 if (CDSConfig::is_dumping_preimage_static_archive() || CDSConfig::is_dumping_dynamic_archive()) {
1298 if (!AOTClassLocationConfig::dumptime()->is_valid_classpath_index(classpath_index, result)) {
1299 classpath_index = -1;
1300 }
1301 }
1302
1303 AOTClassLocationConfig::dumptime_update_max_used_index(classpath_index);
1304 result->set_shared_classpath_index(classpath_index);
1305 }
1306
1307 void ClassLoader::record_hidden_class(InstanceKlass* ik) {
1308 assert(ik->is_hidden(), "must be");
1309
1310 if (ik->defined_by_other_loaders()) {
1311 // We don't archive hidden classes for non-builtin loaders.
1312 return;
1313 }
1314
1315 if (HeapShared::is_lambda_proxy_klass(ik)) {
1316 InstanceKlass* nest_host = ik->nest_host_not_null();
1317 ik->set_shared_classpath_index(nest_host->shared_classpath_index());
1318 } else if (HeapShared::is_lambda_form_klass(ik)) {
1319 ik->set_shared_classpath_index(0);
1320 } else {
1321 // Generated invoker classes.
1322 if (ik->defined_by_app_loader()) {
1323 ik->set_shared_classpath_index(AOTClassLocationConfig::dumptime()->app_cp_start_index());
1324 } else {
1325 ik->set_shared_classpath_index(0);
1326 }
1327 }
1328 }
1329
1330 void ClassLoader::append_boot_classpath(ClassPathEntry* new_entry) {
1331 if (CDSConfig::is_using_archive()) {
1332 warning("Sharing is only supported for boot loader classes because bootstrap classpath has been appended");
1333 FileMapInfo::current_info()->set_has_platform_or_app_classes(false);
1334 if (DynamicArchive::is_mapped()) {
1335 FileMapInfo::dynamic_info()->set_has_platform_or_app_classes(false);
1336 }
1337 }
1338 add_to_boot_append_entries(new_entry);
1339 }
1340 #endif // INCLUDE_CDS
1341
1342 // Initialize the class loader's access to methods in libzip. Parse and
1343 // process the boot classpath into a list ClassPathEntry objects. Once
1344 // this list has been created, it must not change order (see class PackageInfo)
1345 // it can be appended to and is by jvmti.
1346
1347 void ClassLoader::initialize(TRAPS) {
1348 if (UsePerfData) {
1349 // jvmstat performance counters
1350 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1351 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1352 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1353 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1354 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1355 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1356 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1357 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1358 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1359 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1360
1361 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1362 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1363 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1364 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1365 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1366 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1367 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1368 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1369 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1370 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1371 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, "unsafeDefineClassCalls");
1372 NEWPERFTICKCOUNTER(_perf_secondary_hash_time, SUN_CLS, "secondarySuperHashTime");
1373
1374 if (log_is_enabled(Info, perf, class, link)) {
1375 NEWPERFTICKCOUNTER(_perf_ik_link_methods_time, SUN_CLS, "linkMethodsTime");
1376 NEWPERFTICKCOUNTER(_perf_method_adapters_time, SUN_CLS, "makeAdaptersTime");
1377 NEWPERFEVENTCOUNTER(_perf_ik_link_methods_count, SUN_CLS, "linkMethodsCount");
1378 NEWPERFEVENTCOUNTER(_perf_method_adapters_count, SUN_CLS, "makeAdaptersCount");
1379
1380 NEWPERFTICKCOUNTER(_perf_resolve_indy_time, SUN_CLS, "resolve_invokedynamic_time");
1381 NEWPERFTICKCOUNTER(_perf_resolve_invokehandle_time, SUN_CLS, "resolve_invokehandle_time");
1382 NEWPERFTICKCOUNTER(_perf_resolve_mh_time, SUN_CLS, "resolve_MethodHandle_time");
1383 NEWPERFTICKCOUNTER(_perf_resolve_mt_time, SUN_CLS, "resolve_MethodType_time");
1384
1385 NEWPERFEVENTCOUNTER(_perf_resolve_indy_count, SUN_CLS, "resolve_invokedynamic_count");
1386 NEWPERFEVENTCOUNTER(_perf_resolve_invokehandle_count, SUN_CLS, "resolve_invokehandle_count");
1387 NEWPERFEVENTCOUNTER(_perf_resolve_mh_count, SUN_CLS, "resolve_MethodHandle_count");
1388 NEWPERFEVENTCOUNTER(_perf_resolve_mt_count, SUN_CLS, "resolve_MethodType_count");
1389 }
1390 }
1391
1392 // lookup java library entry points
1393 load_java_library();
1394 // jimage library entry points are loaded below, in lookup_vm_options
1395 setup_bootstrap_search_path(THREAD);
1396 }
1397
1398 static char* lookup_vm_resource(JImageFile *jimage, const char *jimage_version, const char *path) {
1399 jlong size;
1400 JImageLocationRef location = (*JImageFindResource)(jimage, "java.base", jimage_version, path, &size);
1401 if (location == 0)
1402 return nullptr;
1403 char *val = NEW_C_HEAP_ARRAY(char, size+1, mtClass);
1404 (*JImageGetResource)(jimage, location, val, size);
1405 val[size] = '\0';
1406 return val;
1407 }
1408
1409 // Lookup VM options embedded in the modules jimage file
1410 char* ClassLoader::lookup_vm_options() {
1411 jint error;
1412 char modules_path[JVM_MAXPATHLEN];
1413 const char* fileSep = os::file_separator();
1414
1415 // Initialize jimage library entry points
1416 load_jimage_library();
1417
1418 jio_snprintf(modules_path, JVM_MAXPATHLEN, "%s%slib%smodules", Arguments::get_java_home(), fileSep, fileSep);
1419 JImage_file =(*JImageOpen)(modules_path, &error);
1420 if (JImage_file == nullptr) {
1421 return nullptr;
1422 }
1423
1424 const char *jimage_version = get_jimage_version_string();
1425 char *options = lookup_vm_resource(JImage_file, jimage_version, "jdk/internal/vm/options");
1426 return options;
1427 }
1428
1429 bool ClassLoader::is_module_observable(const char* module_name) {
1430 assert(JImageOpen != nullptr, "jimage library should have been opened");
1431 if (JImage_file == nullptr) {
1432 struct stat st;
1433 const char *path = get_exploded_module_path(module_name, true);
1434 bool res = os::stat(path, &st) == 0;
1435 FREE_C_HEAP_ARRAY(char, path);
1436 return res;
1437 }
1438 jlong size;
1439 const char *jimage_version = get_jimage_version_string();
1440 return (*JImageFindResource)(JImage_file, module_name, jimage_version, "module-info.class", &size) != 0;
1441 }
1442
1443 jlong ClassLoader::classloader_time_ms() {
1444 return UsePerfData ?
1445 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1446 }
1447
1448 jlong ClassLoader::class_init_count() {
1449 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1450 }
1451
1452 jlong ClassLoader::class_init_time_ms() {
1453 return UsePerfData ?
1454 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1455 }
1456
1457 jlong ClassLoader::class_verify_time_ms() {
1458 return UsePerfData ?
1459 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1460 }
1461
1462 jlong ClassLoader::class_link_count() {
1463 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1464 }
1465
1466 jlong ClassLoader::class_link_time_ms() {
1467 return UsePerfData ?
1468 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1469 }
1470
1471 int ClassLoader::compute_Object_vtable() {
1472 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1473 // code to determine actual value from file
1474 // Would be value '11' if finals were in vtable
1475 int JDK_1_2_Object_vtable_size = 5;
1476 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1477 }
1478
1479
1480 void classLoader_init1() {
1481 EXCEPTION_MARK;
1482 ClassLoader::initialize(THREAD);
1483 if (HAS_PENDING_EXCEPTION) {
1484 vm_exit_during_initialization("ClassLoader::initialize() failed unexpectedly");
1485 }
1486 }
1487
1488 // Complete the ClassPathEntry setup for the boot loader
1489 void ClassLoader::classLoader_init2(JavaThread* current) {
1490 // Setup the list of module/path pairs for --patch-module processing
1491 // This must be done after the SymbolTable is created in order
1492 // to use fast_compare on module names instead of a string compare.
1493 if (Arguments::get_patch_mod_prefix() != nullptr) {
1494 setup_patch_mod_entries();
1495 }
1496
1497 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1498 // to successfully determine if java.base has been patched)
1499 create_javabase();
1500
1501 // Setup the initial java.base/path pair for the exploded build entries.
1502 // As more modules are defined during module system initialization, more
1503 // entries will be added to the exploded build array.
1504 if (!has_jrt_entry()) {
1505 assert(!CDSConfig::is_dumping_archive(), "not supported with exploded module builds");
1506 assert(!CDSConfig::is_using_archive(), "UsedSharedSpaces not supported with exploded module builds");
1507 // Set up the boot loader's _exploded_entries list. Note that this gets
1508 // done before loading any classes, by the same thread that will
1509 // subsequently do the first class load. So, no lock is needed for this.
1510 assert(_exploded_entries == nullptr, "Should only get initialized once");
1511 _exploded_entries = new (mtModule)
1512 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, mtModule);
1513 add_to_exploded_build_list(current, vmSymbols::java_base());
1514 }
1515 }
1516
1517 char* ClassLoader::get_canonical_path(const char* orig, Thread* thread) {
1518 assert(orig != nullptr, "bad arguments");
1519 // caller needs to allocate ResourceMark for the following output buffer
1520 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
1521 ResourceMark rm(thread);
1522 // os::native_path writes into orig_copy
1523 char* orig_copy = ResourceArea::strdup(thread, orig);
1524 if ((CanonicalizeEntry)(os::native_path(orig_copy), canonical_path, JVM_MAXPATHLEN) < 0) {
1525 return nullptr;
1526 }
1527 return canonical_path;
1528 }
1529
1530 void ClassLoader::create_javabase() {
1531 JavaThread* current = JavaThread::current();
1532
1533 // Create java.base's module entry for the boot
1534 // class loader prior to loading j.l.Object.
1535 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1536
1537 // Get module entry table
1538 ModuleEntryTable* null_cld_modules = null_cld->modules();
1539 if (null_cld_modules == nullptr) {
1540 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1541 }
1542
1543 {
1544 MutexLocker ml(current, Module_lock);
1545 if (ModuleEntryTable::javabase_moduleEntry() == nullptr) { // may have been inited by CDS.
1546 ModuleEntry* jb_module = null_cld_modules->locked_create_entry(Handle(),
1547 false, vmSymbols::java_base(), nullptr, nullptr, null_cld);
1548 if (jb_module == nullptr) {
1549 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1550 }
1551 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1552 }
1553 }
1554 }
1555
1556 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1557 // they could get inlined by aggressive compiler, an unknown trick, see bug 6966589.
1558 void PerfClassTraceTime::initialize() {
1559 if (!UsePerfData) return;
1560
1561 if (_eventp != nullptr) {
1562 // increment the event counter
1563 _eventp->inc();
1564 }
1565
1566 // stop the current active thread-local timer to measure inclusive time
1567 _prev_active_event = -1;
1568 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1569 if (_timers[i].is_active()) {
1570 assert(_prev_active_event == -1, "should have only one active timer");
1571 _prev_active_event = i;
1572 _timers[i].stop();
1573 }
1574 }
1575
1576 if (_recursion_counters == nullptr || (_recursion_counters[_event_type])++ == 0) {
1577 // start the inclusive timer if not recursively called
1578 _t.start();
1579 }
1580
1581 // start thread-local timer of the given event type
1582 if (!_timers[_event_type].is_active()) {
1583 _timers[_event_type].start();
1584 }
1585 }
1586
1587 PerfClassTraceTime::~PerfClassTraceTime() {
1588 if (!UsePerfData) return;
1589
1590 // stop the thread-local timer as the event completes
1591 // and resume the thread-local timer of the event next on the stack
1592 _timers[_event_type].stop();
1593 jlong selftime = _timers[_event_type].ticks();
1594
1595 if (_prev_active_event >= 0) {
1596 _timers[_prev_active_event].start();
1597 }
1598
1599 if (_recursion_counters != nullptr && --(_recursion_counters[_event_type]) > 0) return;
1600
1601 // increment the counters only on the leaf call
1602 _t.stop();
1603 _timep->inc(_t.ticks());
1604 if (_selftimep != nullptr) {
1605 _selftimep->inc(selftime);
1606 }
1607 // add all class loading related event selftime to the accumulated time counter
1608 ClassLoader::perf_accumulated_time()->inc(selftime);
1609
1610 // reset the timer
1611 _timers[_event_type].reset();
1612 }