1 /*
2 * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "jimage.hpp"
28 #include "cds/cds_globals.hpp"
29 #include "cds/filemap.hpp"
30 #include "classfile/classFileStream.hpp"
31 #include "classfile/classLoader.inline.hpp"
32 #include "classfile/classLoaderData.inline.hpp"
33 #include "classfile/classLoaderExt.hpp"
34 #include "classfile/classLoadInfo.hpp"
35 #include "classfile/javaClasses.hpp"
36 #include "classfile/moduleEntry.hpp"
37 #include "classfile/modules.hpp"
38 #include "classfile/packageEntry.hpp"
39 #include "classfile/klassFactory.hpp"
40 #include "classfile/symbolTable.hpp"
41 #include "classfile/systemDictionary.hpp"
42 #include "classfile/systemDictionaryShared.hpp"
43 #include "classfile/vmClasses.hpp"
44 #include "classfile/vmSymbols.hpp"
45 #include "compiler/compileBroker.hpp"
46 #include "interpreter/bytecodeStream.hpp"
47 #include "interpreter/oopMapCache.hpp"
48 #include "logging/log.hpp"
49 #include "logging/logStream.hpp"
50 #include "logging/logTag.hpp"
51 #include "memory/allocation.inline.hpp"
52 #include "memory/oopFactory.hpp"
53 #include "memory/resourceArea.hpp"
54 #include "memory/universe.hpp"
55 #include "oops/instanceKlass.hpp"
56 #include "oops/instanceRefKlass.hpp"
57 #include "oops/klass.inline.hpp"
58 #include "oops/method.inline.hpp"
59 #include "oops/objArrayOop.inline.hpp"
60 #include "oops/oop.inline.hpp"
61 #include "oops/symbol.hpp"
62 #include "prims/jvm_misc.hpp"
63 #include "runtime/arguments.hpp"
64 #include "runtime/handles.inline.hpp"
65 #include "runtime/init.hpp"
66 #include "runtime/interfaceSupport.inline.hpp"
67 #include "runtime/java.hpp"
68 #include "runtime/javaCalls.hpp"
69 #include "runtime/os.hpp"
70 #include "runtime/perfData.hpp"
71 #include "runtime/threadCritical.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/classpathStream.hpp"
77 #include "utilities/events.hpp"
78 #include "utilities/macros.hpp"
79 #include "utilities/utf8.hpp"
80
81 // Entry point in java.dll for path canonicalization
82
83 typedef int (*canonicalize_fn_t)(const char *orig, char *out, int len);
84
85 static canonicalize_fn_t CanonicalizeEntry = NULL;
86
87 // Entry points in zip.dll for loading zip/jar file entries
88
89 typedef void * * (*ZipOpen_t)(const char *name, char **pmsg);
90 typedef void (*ZipClose_t)(jzfile *zip);
91 typedef jzentry* (*FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
92 typedef jboolean (*ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
93 typedef jzentry* (*GetNextEntry_t)(jzfile *zip, jint n);
94 typedef jint (*Crc32_t)(jint crc, const jbyte *buf, jint len);
95
96 static ZipOpen_t ZipOpen = NULL;
97 static ZipClose_t ZipClose = NULL;
98 static FindEntry_t FindEntry = NULL;
99 static ReadEntry_t ReadEntry = NULL;
100 static GetNextEntry_t GetNextEntry = NULL;
101 static Crc32_t Crc32 = NULL;
102 int ClassLoader::_libzip_loaded = 0;
103 void* ClassLoader::_zip_handle = NULL;
104
105 // Entry points for jimage.dll for loading jimage file entries
106
107 static JImageOpen_t JImageOpen = NULL;
108 static JImageClose_t JImageClose = NULL;
109 static JImageFindResource_t JImageFindResource = NULL;
110 static JImageGetResource_t JImageGetResource = NULL;
111
112 // JimageFile pointer, or null if exploded JDK build.
113 static JImageFile* JImage_file = NULL;
114
115 // Globals
116
117 PerfCounter* ClassLoader::_perf_accumulated_time = NULL;
118 PerfCounter* ClassLoader::_perf_classes_inited = NULL;
119 PerfCounter* ClassLoader::_perf_class_init_time = NULL;
120 PerfCounter* ClassLoader::_perf_class_init_selftime = NULL;
121 PerfCounter* ClassLoader::_perf_classes_verified = NULL;
122 PerfCounter* ClassLoader::_perf_class_verify_time = NULL;
123 PerfCounter* ClassLoader::_perf_class_verify_selftime = NULL;
124 PerfCounter* ClassLoader::_perf_classes_linked = NULL;
125 PerfCounter* ClassLoader::_perf_class_link_time = NULL;
126 PerfCounter* ClassLoader::_perf_class_link_selftime = NULL;
127 PerfCounter* ClassLoader::_perf_sys_class_lookup_time = NULL;
128 PerfCounter* ClassLoader::_perf_shared_classload_time = NULL;
129 PerfCounter* ClassLoader::_perf_sys_classload_time = NULL;
130 PerfCounter* ClassLoader::_perf_app_classload_time = NULL;
131 PerfCounter* ClassLoader::_perf_app_classload_selftime = NULL;
132 PerfCounter* ClassLoader::_perf_app_classload_count = NULL;
133 PerfCounter* ClassLoader::_perf_define_appclasses = NULL;
134 PerfCounter* ClassLoader::_perf_define_appclass_time = NULL;
135 PerfCounter* ClassLoader::_perf_define_appclass_selftime = NULL;
136 PerfCounter* ClassLoader::_perf_app_classfile_bytes_read = NULL;
137 PerfCounter* ClassLoader::_perf_sys_classfile_bytes_read = NULL;
138 PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL;
139
140 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = NULL;
141 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = NULL;
142 ClassPathEntry* ClassLoader::_jrt_entry = NULL;
143
144 ClassPathEntry* volatile ClassLoader::_first_append_entry_list = NULL;
145 ClassPathEntry* volatile ClassLoader::_last_append_entry = NULL;
146 #if INCLUDE_CDS
147 ClassPathEntry* ClassLoader::_app_classpath_entries = NULL;
148 ClassPathEntry* ClassLoader::_last_app_classpath_entry = NULL;
149 ClassPathEntry* ClassLoader::_module_path_entries = NULL;
150 ClassPathEntry* ClassLoader::_last_module_path_entry = NULL;
151 #endif
152
153 // helper routines
154 bool string_starts_with(const char* str, const char* str_to_find) {
155 size_t str_len = strlen(str);
156 size_t str_to_find_len = strlen(str_to_find);
157 if (str_to_find_len > str_len) {
158 return false;
159 }
160 return (strncmp(str, str_to_find, str_to_find_len) == 0);
161 }
162
163 static const char* get_jimage_version_string() {
164 static char version_string[10] = "";
165 if (version_string[0] == '\0') {
166 jio_snprintf(version_string, sizeof(version_string), "%d.%d",
167 VM_Version::vm_major_version(), VM_Version::vm_minor_version());
168 }
169 return (const char*)version_string;
170 }
171
172 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
173 size_t str_len = strlen(str);
174 size_t str_to_find_len = strlen(str_to_find);
175 if (str_to_find_len > str_len) {
176 return false;
177 }
178 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
179 }
180
181 // Used to obtain the package name from a fully qualified class name.
182 Symbol* ClassLoader::package_from_class_name(const Symbol* name, bool* bad_class_name) {
183 if (name == NULL) {
184 if (bad_class_name != NULL) {
185 *bad_class_name = true;
186 }
187 return NULL;
188 }
189
190 int utf_len = name->utf8_length();
191 const jbyte* base = (const jbyte*)name->base();
192 const jbyte* start = base;
193 const jbyte* end = UTF8::strrchr(start, utf_len, JVM_SIGNATURE_SLASH);
194 if (end == NULL) {
195 return NULL;
196 }
197 // Skip over '['s
198 if (*start == JVM_SIGNATURE_ARRAY) {
199 do {
200 start++;
201 } while (start < end && *start == JVM_SIGNATURE_ARRAY);
202
203 // Fully qualified class names should not contain a 'L'.
204 // Set bad_class_name to true to indicate that the package name
205 // could not be obtained due to an error condition.
206 // In this situation, is_same_class_package returns false.
207 if (*start == JVM_SIGNATURE_CLASS) {
208 if (bad_class_name != NULL) {
209 *bad_class_name = true;
210 }
211 return NULL;
212 }
213 }
214 // A class name could have just the slash character in the name,
215 // in which case start > end
216 if (start >= end) {
217 // No package name
218 if (bad_class_name != NULL) {
219 *bad_class_name = true;
220 }
221 return NULL;
222 }
223 return SymbolTable::new_symbol(name, start - base, end - base);
224 }
225
226 // Given a fully qualified package name, find its defining package in the class loader's
227 // package entry table.
228 PackageEntry* ClassLoader::get_package_entry(Symbol* pkg_name, ClassLoaderData* loader_data) {
229 if (pkg_name == NULL) {
230 return NULL;
231 }
232 PackageEntryTable* pkgEntryTable = loader_data->packages();
233 return pkgEntryTable->lookup_only(pkg_name);
234 }
235
236 const char* ClassPathEntry::copy_path(const char* path) {
237 char* copy = NEW_C_HEAP_ARRAY(char, strlen(path)+1, mtClass);
238 strcpy(copy, path);
239 return copy;
240 }
241
242 ClassFileStream* ClassPathDirEntry::open_stream(JavaThread* current, const char* name) {
243 // construct full path name
244 assert((_dir != NULL) && (name != NULL), "sanity");
245 size_t path_len = strlen(_dir) + strlen(name) + strlen(os::file_separator()) + 1;
246 char* path = NEW_RESOURCE_ARRAY_IN_THREAD(current, char, path_len);
247 int len = jio_snprintf(path, path_len, "%s%s%s", _dir, os::file_separator(), name);
248 assert(len == (int)(path_len - 1), "sanity");
249 // check if file exists
250 struct stat st;
251 if (os::stat(path, &st) == 0) {
252 // found file, open it
253 int file_handle = os::open(path, 0, 0);
254 if (file_handle != -1) {
255 // read contents into resource array
256 u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
257 size_t num_read = ::read(file_handle, (char*) buffer, st.st_size);
258 // close file
259 ::close(file_handle);
260 // construct ClassFileStream
261 if (num_read == (size_t)st.st_size) {
262 if (UsePerfData) {
263 ClassLoader::perf_sys_classfile_bytes_read()->inc(num_read);
264 }
265 FREE_RESOURCE_ARRAY(char, path, path_len);
266 // Resource allocated
267 return new ClassFileStream(buffer,
268 st.st_size,
269 _dir,
270 ClassFileStream::verify);
271 }
272 }
273 }
274 FREE_RESOURCE_ARRAY(char, path, path_len);
275 return NULL;
276 }
277
278 ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name,
279 bool is_boot_append, bool from_class_path_attr) : ClassPathEntry() {
280 _zip = zip;
281 _zip_name = copy_path(zip_name);
282 _from_class_path_attr = from_class_path_attr;
283 }
284
285 ClassPathZipEntry::~ClassPathZipEntry() {
286 (*ZipClose)(_zip);
287 FREE_C_HEAP_ARRAY(char, _zip_name);
288 }
289
290 u1* ClassPathZipEntry::open_entry(JavaThread* current, const char* name, jint* filesize, bool nul_terminate) {
291 // enable call to C land
292 ThreadToNativeFromVM ttn(current);
293 // check whether zip archive contains name
294 jint name_len;
295 jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
296 if (entry == NULL) return NULL;
297 u1* buffer;
298 char name_buf[128];
299 char* filename;
300 if (name_len < 128) {
301 filename = name_buf;
302 } else {
303 filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
304 }
305
306 // read contents into resource array
307 size_t size = (uint32_t)(*filesize);
308 if (nul_terminate) {
309 if (sizeof(size) == sizeof(uint32_t) && size == UINT_MAX) {
310 return NULL; // 32-bit integer overflow will occur.
311 }
312 size++;
313 }
314 buffer = NEW_RESOURCE_ARRAY(u1, size);
315 if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
316
317 // return result
318 if (nul_terminate) {
319 buffer[size - 1] = 0;
320 }
321 return buffer;
322 }
323
324 ClassFileStream* ClassPathZipEntry::open_stream(JavaThread* current, const char* name) {
325 jint filesize;
326 u1* buffer = open_entry(current, name, &filesize, false);
327 if (buffer == NULL) {
328 return NULL;
329 }
330 if (UsePerfData) {
331 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
332 }
333 // Resource allocated
334 return new ClassFileStream(buffer,
335 filesize,
336 _zip_name,
337 ClassFileStream::verify);
338 }
339
340 // invoke function for each entry in the zip file
341 void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
342 JavaThread* thread = JavaThread::current();
343 HandleMark handle_mark(thread);
344 ThreadToNativeFromVM ttn(thread);
345 for (int n = 0; ; n++) {
346 jzentry * ze = ((*GetNextEntry)(_zip, n));
347 if (ze == NULL) break;
348 (*f)(ze->name, context);
349 }
350 }
351
352 DEBUG_ONLY(ClassPathImageEntry* ClassPathImageEntry::_singleton = NULL;)
353
354 JImageFile* ClassPathImageEntry::jimage() const {
355 return JImage_file;
356 }
357
358 JImageFile* ClassPathImageEntry::jimage_non_null() const {
359 assert(ClassLoader::has_jrt_entry(), "must be");
360 assert(jimage() != NULL, "should have been opened by ClassLoader::lookup_vm_options "
361 "and remained throughout normal JVM lifetime");
362 return jimage();
363 }
364
365 void ClassPathImageEntry::close_jimage() {
366 if (jimage() != NULL) {
367 (*JImageClose)(jimage());
368 JImage_file = NULL;
369 }
370 }
371
372 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
373 ClassPathEntry() {
374 guarantee(jimage != NULL, "jimage file is null");
375 guarantee(name != NULL, "jimage file name is null");
376 assert(_singleton == NULL, "VM supports only one jimage");
377 DEBUG_ONLY(_singleton = this);
378 size_t len = strlen(name) + 1;
379 _name = copy_path(name);
380 }
381
382 ClassFileStream* ClassPathImageEntry::open_stream(JavaThread* current, const char* name) {
383 return open_stream_for_loader(current, name, ClassLoaderData::the_null_class_loader_data());
384 }
385
386 // For a class in a named module, look it up in the jimage file using this syntax:
387 // /<module-name>/<package-name>/<base-class>
388 //
389 // Assumptions:
390 // 1. There are no unnamed modules in the jimage file.
391 // 2. A package is in at most one module in the jimage file.
392 //
393 ClassFileStream* ClassPathImageEntry::open_stream_for_loader(JavaThread* current, const char* name, ClassLoaderData* loader_data) {
394 jlong size;
395 JImageLocationRef location = (*JImageFindResource)(jimage_non_null(), "", get_jimage_version_string(), name, &size);
396
397 if (location == 0) {
398 TempNewSymbol class_name = SymbolTable::new_symbol(name);
399 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name);
400
401 if (pkg_name != NULL) {
402 if (!Universe::is_module_initialized()) {
403 location = (*JImageFindResource)(jimage_non_null(), JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
404 } else {
405 PackageEntry* package_entry = ClassLoader::get_package_entry(pkg_name, loader_data);
406 if (package_entry != NULL) {
407 ResourceMark rm(current);
408 // Get the module name
409 ModuleEntry* module = package_entry->module();
410 assert(module != NULL, "Boot classLoader package missing module");
411 assert(module->is_named(), "Boot classLoader package is in unnamed module");
412 const char* module_name = module->name()->as_C_string();
413 if (module_name != NULL) {
414 location = (*JImageFindResource)(jimage_non_null(), module_name, get_jimage_version_string(), name, &size);
415 }
416 }
417 }
418 }
419 }
420 if (location != 0) {
421 if (UsePerfData) {
422 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
423 }
424 char* data = NEW_RESOURCE_ARRAY(char, size);
425 (*JImageGetResource)(jimage_non_null(), location, data, size);
426 // Resource allocated
427 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be");
428 return new ClassFileStream((u1*)data,
429 (int)size,
430 _name,
431 ClassFileStream::verify,
432 true); // from_boot_loader_modules_image
433 }
434
435 return NULL;
436 }
437
438 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
439 const char* module_name,
440 const char* file_name,
441 jlong &size) {
442 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
443 }
444
445 bool ClassPathImageEntry::is_modules_image() const {
446 assert(this == _singleton, "VM supports a single jimage");
447 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be used for jrt entry");
448 return true;
449 }
450
451 #if INCLUDE_CDS
452 void ClassLoader::exit_with_path_failure(const char* error, const char* message) {
453 Arguments::assert_is_dumping_archive();
454 tty->print_cr("Hint: enable -Xlog:class+path=info to diagnose the failure");
455 vm_exit_during_initialization(error, message);
456 }
457 #endif
458
459 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
460 _module_name = module_name;
461 _module_first_entry = NULL;
462 _module_last_entry = NULL;
463 }
464
465 ModuleClassPathList::~ModuleClassPathList() {
466 // Clean out each ClassPathEntry on list
467 ClassPathEntry* e = _module_first_entry;
468 while (e != NULL) {
469 ClassPathEntry* next_entry = e->next();
470 delete e;
471 e = next_entry;
472 }
473 }
474
475 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
476 if (new_entry != NULL) {
477 if (_module_last_entry == NULL) {
478 _module_first_entry = _module_last_entry = new_entry;
479 } else {
480 _module_last_entry->set_next(new_entry);
481 _module_last_entry = new_entry;
482 }
483 }
484 }
485
486 void ClassLoader::trace_class_path(const char* msg, const char* name) {
487 LogTarget(Info, class, path) lt;
488 if (lt.is_enabled()) {
489 LogStream ls(lt);
490 if (msg) {
491 ls.print("%s", msg);
492 }
493 if (name) {
494 if (strlen(name) < 256) {
495 ls.print("%s", name);
496 } else {
497 // For very long paths, we need to print each character separately,
498 // as print_cr() has a length limit
499 while (name[0] != '\0') {
500 ls.print("%c", name[0]);
501 name++;
502 }
503 }
504 }
505 ls.cr();
506 }
507 }
508
509 void ClassLoader::setup_bootstrap_search_path(JavaThread* current) {
510 const char* bootcp = Arguments::get_boot_class_path();
511 assert(bootcp != NULL, "Boot class path must not be NULL");
512 if (PrintSharedArchiveAndExit) {
513 // Don't print bootcp - this is the bootcp of this current VM process, not necessarily
514 // the same as the boot classpath of the shared archive.
515 } else {
516 trace_class_path("bootstrap loader class path=", bootcp);
517 }
518 setup_bootstrap_search_path_impl(current, bootcp);
519 }
520
521 #if INCLUDE_CDS
522 void ClassLoader::setup_app_search_path(JavaThread* current, const char *class_path) {
523 Arguments::assert_is_dumping_archive();
524
525 ResourceMark rm(current);
526 ClasspathStream cp_stream(class_path);
527
528 while (cp_stream.has_next()) {
529 const char* path = cp_stream.get_next();
530 update_class_path_entry_list(current, path, false, false, false);
531 }
532 }
533
534 void ClassLoader::add_to_module_path_entries(const char* path,
535 ClassPathEntry* entry) {
536 assert(entry != NULL, "ClassPathEntry should not be NULL");
537 Arguments::assert_is_dumping_archive();
538
539 // The entry does not exist, add to the list
540 if (_module_path_entries == NULL) {
541 assert(_last_module_path_entry == NULL, "Sanity");
542 _module_path_entries = _last_module_path_entry = entry;
543 } else {
544 _last_module_path_entry->set_next(entry);
545 _last_module_path_entry = entry;
546 }
547 }
548
549 // Add a module path to the _module_path_entries list.
550 void ClassLoader::setup_module_search_path(JavaThread* current, const char* path) {
551 Arguments::assert_is_dumping_archive();
552 struct stat st;
553 if (os::stat(path, &st) != 0) {
554 tty->print_cr("os::stat error %d (%s). CDS dump aborted (path was \"%s\").",
555 errno, os::errno_name(errno), path);
556 vm_exit_during_initialization();
557 }
558 // File or directory found
559 ClassPathEntry* new_entry = NULL;
560 new_entry = create_class_path_entry(current, path, &st,
561 false /*is_boot_append */, false /* from_class_path_attr */);
562 if (new_entry != NULL) {
563 add_to_module_path_entries(path, new_entry);
564 }
565 }
566
567 #endif // INCLUDE_CDS
568
569 void ClassLoader::close_jrt_image() {
570 // Not applicable for exploded builds
571 if (!ClassLoader::has_jrt_entry()) return;
572 _jrt_entry->close_jimage();
573 }
574
575 // Construct the array of module/path pairs as specified to --patch-module
576 // for the boot loader to search ahead of the jimage, if the class being
577 // loaded is defined to a module that has been specified to --patch-module.
578 void ClassLoader::setup_patch_mod_entries() {
579 JavaThread* current = JavaThread::current();
580 GrowableArray<ModulePatchPath*>* patch_mod_args = Arguments::get_patch_mod_prefix();
581 int num_of_entries = patch_mod_args->length();
582
583 // Set up the boot loader's _patch_mod_entries list
584 _patch_mod_entries = new (ResourceObj::C_HEAP, mtModule) GrowableArray<ModuleClassPathList*>(num_of_entries, mtModule);
585
586 for (int i = 0; i < num_of_entries; i++) {
587 const char* module_name = (patch_mod_args->at(i))->module_name();
588 Symbol* const module_sym = SymbolTable::new_symbol(module_name);
589 assert(module_sym != NULL, "Failed to obtain Symbol for module name");
590 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
591
592 char* class_path = (patch_mod_args->at(i))->path_string();
593 ResourceMark rm(current);
594 ClasspathStream cp_stream(class_path);
595
596 while (cp_stream.has_next()) {
597 const char* path = cp_stream.get_next();
598 struct stat st;
599 if (os::stat(path, &st) == 0) {
600 // File or directory found
601 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st, false, false);
602 // If the path specification is valid, enter it into this module's list
603 if (new_entry != NULL) {
604 module_cpl->add_to_list(new_entry);
605 }
606 }
607 }
608
609 // Record the module into the list of --patch-module entries only if
610 // valid ClassPathEntrys have been created
611 if (module_cpl->module_first_entry() != NULL) {
612 _patch_mod_entries->push(module_cpl);
613 }
614 }
615 }
616
617 // Determine whether the module has been patched via the command-line
618 // option --patch-module
619 bool ClassLoader::is_in_patch_mod_entries(Symbol* module_name) {
620 if (_patch_mod_entries != NULL && _patch_mod_entries->is_nonempty()) {
621 int table_len = _patch_mod_entries->length();
622 for (int i = 0; i < table_len; i++) {
623 ModuleClassPathList* patch_mod = _patch_mod_entries->at(i);
624 if (module_name->fast_compare(patch_mod->module_name()) == 0) {
625 return true;
626 }
627 }
628 }
629 return false;
630 }
631
632 // Set up the _jrt_entry if present and boot append path
633 void ClassLoader::setup_bootstrap_search_path_impl(JavaThread* current, const char *class_path) {
634 ResourceMark rm(current);
635 ClasspathStream cp_stream(class_path);
636 bool set_base_piece = true;
637
638 #if INCLUDE_CDS
639 if (Arguments::is_dumping_archive()) {
640 if (!Arguments::has_jimage()) {
641 vm_exit_during_initialization("CDS is not supported in exploded JDK build", NULL);
642 }
643 }
644 #endif
645
646 while (cp_stream.has_next()) {
647 const char* path = cp_stream.get_next();
648
649 if (set_base_piece) {
650 // The first time through the bootstrap_search setup, it must be determined
651 // what the base or core piece of the boot loader search is. Either a java runtime
652 // image is present or this is an exploded module build situation.
653 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
654 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
655 struct stat st;
656 if (os::stat(path, &st) == 0) {
657 // Directory found
658 if (JImage_file != NULL) {
659 assert(Arguments::has_jimage(), "sanity check");
660 const char* canonical_path = get_canonical_path(path, current);
661 assert(canonical_path != NULL, "canonical_path issue");
662
663 _jrt_entry = new ClassPathImageEntry(JImage_file, canonical_path);
664 assert(_jrt_entry != NULL && _jrt_entry->is_modules_image(), "No java runtime image present");
665 assert(_jrt_entry->jimage() != NULL, "No java runtime image");
666 } else {
667 // It's an exploded build.
668 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st, false, false);
669 }
670 } else {
671 // If path does not exist, exit
672 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
673 }
674 set_base_piece = false;
675 } else {
676 // Every entry on the boot class path after the initial base piece,
677 // which is set by os::set_boot_path(), is considered an appended entry.
678 update_class_path_entry_list(current, path, false, true, false);
679 }
680 }
681 }
682
683 // During an exploded modules build, each module defined to the boot loader
684 // will be added to the ClassLoader::_exploded_entries array.
685 void ClassLoader::add_to_exploded_build_list(JavaThread* current, Symbol* module_sym) {
686 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
687 assert(_exploded_entries != NULL, "_exploded_entries was not initialized");
688
689 // Find the module's symbol
690 ResourceMark rm(current);
691 const char *module_name = module_sym->as_C_string();
692 const char *home = Arguments::get_java_home();
693 const char file_sep = os::file_separator()[0];
694 // 10 represents the length of "modules" + 2 file separators + \0
695 size_t len = strlen(home) + strlen(module_name) + 10;
696 char *path = NEW_RESOURCE_ARRAY(char, len);
697 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
698
699 struct stat st;
700 if (os::stat(path, &st) == 0) {
701 // Directory found
702 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st, false, false);
703
704 // If the path specification is valid, enter it into this module's list.
705 // There is no need to check for duplicate modules in the exploded entry list,
706 // since no two modules with the same name can be defined to the boot loader.
707 // This is checked at module definition time in Modules::define_module.
708 if (new_entry != NULL) {
709 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
710 module_cpl->add_to_list(new_entry);
711 {
712 MutexLocker ml(current, Module_lock);
713 _exploded_entries->push(module_cpl);
714 }
715 log_info(class, load)("path: %s", path);
716 }
717 }
718 }
719
720 jzfile* ClassLoader::open_zip_file(const char* canonical_path, char** error_msg, JavaThread* thread) {
721 // enable call to C land
722 ThreadToNativeFromVM ttn(thread);
723 HandleMark hm(thread);
724 load_zip_library_if_needed();
725 return (*ZipOpen)(canonical_path, error_msg);
726 }
727
728 ClassPathEntry* ClassLoader::create_class_path_entry(JavaThread* current,
729 const char *path, const struct stat* st,
730 bool is_boot_append,
731 bool from_class_path_attr) {
732 ClassPathEntry* new_entry = NULL;
733 if ((st->st_mode & S_IFMT) == S_IFREG) {
734 ResourceMark rm(current);
735 // Regular file, should be a zip file
736 // Canonicalized filename
737 const char* canonical_path = get_canonical_path(path, current);
738 if (canonical_path == NULL) {
739 return NULL;
740 }
741 char* error_msg = NULL;
742 jzfile* zip = open_zip_file(canonical_path, &error_msg, current);
743 if (zip != NULL && error_msg == NULL) {
744 new_entry = new ClassPathZipEntry(zip, path, is_boot_append, from_class_path_attr);
745 } else {
746 #if INCLUDE_CDS
747 ClassLoaderExt::set_has_non_jar_in_classpath();
748 #endif
749 return NULL;
750 }
751 log_info(class, path)("opened: %s", path);
752 log_info(class, load)("opened: %s", path);
753 } else {
754 // Directory
755 new_entry = new ClassPathDirEntry(path);
756 log_info(class, load)("path: %s", path);
757 }
758 return new_entry;
759 }
760
761
762 // Create a class path zip entry for a given path (return NULL if not found
763 // or zip/JAR file cannot be opened)
764 ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
765 // check for a regular file
766 struct stat st;
767 if (os::stat(path, &st) == 0) {
768 if ((st.st_mode & S_IFMT) == S_IFREG) {
769 JavaThread* thread = JavaThread::current();
770 ResourceMark rm(thread);
771 const char* canonical_path = get_canonical_path(path, thread);
772 if (canonical_path != NULL) {
773 char* error_msg = NULL;
774 jzfile* zip = open_zip_file(canonical_path, &error_msg, thread);
775 if (zip != NULL && error_msg == NULL) {
776 // create using canonical path
777 return new ClassPathZipEntry(zip, canonical_path, is_boot_append, false);
778 }
779 }
780 }
781 }
782 return NULL;
783 }
784
785 // The boot append entries are added with a lock, and read lock free.
786 void ClassLoader::add_to_boot_append_entries(ClassPathEntry *new_entry) {
787 if (new_entry != NULL) {
788 MutexLocker ml(Bootclasspath_lock, Mutex::_no_safepoint_check_flag);
789 if (_last_append_entry == NULL) {
790 _last_append_entry = new_entry;
791 assert(first_append_entry() == NULL, "boot loader's append class path entry list not empty");
792 Atomic::release_store(&_first_append_entry_list, new_entry);
793 } else {
794 _last_append_entry->set_next(new_entry);
795 _last_append_entry = new_entry;
796 }
797 }
798 }
799
800 // Record the path entries specified in -cp during dump time. The recorded
801 // information will be used at runtime for loading the archived app classes.
802 //
803 // Note that at dump time, ClassLoader::_app_classpath_entries are NOT used for
804 // loading app classes. Instead, the app class are loaded by the
805 // jdk/internal/loader/ClassLoaders$AppClassLoader instance.
806 void ClassLoader::add_to_app_classpath_entries(JavaThread* current,
807 const char* path,
808 ClassPathEntry* entry,
809 bool check_for_duplicates) {
810 #if INCLUDE_CDS
811 assert(entry != NULL, "ClassPathEntry should not be NULL");
812 ClassPathEntry* e = _app_classpath_entries;
813 if (check_for_duplicates) {
814 while (e != NULL) {
815 if (strcmp(e->name(), entry->name()) == 0) {
816 // entry already exists
817 return;
818 }
819 e = e->next();
820 }
821 }
822
823 // The entry does not exist, add to the list
824 if (_app_classpath_entries == NULL) {
825 assert(_last_app_classpath_entry == NULL, "Sanity");
826 _app_classpath_entries = _last_app_classpath_entry = entry;
827 } else {
828 _last_app_classpath_entry->set_next(entry);
829 _last_app_classpath_entry = entry;
830 }
831
832 if (entry->is_jar_file()) {
833 ClassLoaderExt::process_jar_manifest(current, entry, check_for_duplicates);
834 }
835 #endif
836 }
837
838 // Returns true IFF the file/dir exists and the entry was successfully created.
839 bool ClassLoader::update_class_path_entry_list(JavaThread* current,
840 const char *path,
841 bool check_for_duplicates,
842 bool is_boot_append,
843 bool from_class_path_attr) {
844 struct stat st;
845 if (os::stat(path, &st) == 0) {
846 // File or directory found
847 ClassPathEntry* new_entry = NULL;
848 new_entry = create_class_path_entry(current, path, &st, is_boot_append, from_class_path_attr);
849 if (new_entry == NULL) {
850 return false;
851 }
852
853 // Do not reorder the bootclasspath which would break get_system_package().
854 // Add new entry to linked list
855 if (is_boot_append) {
856 add_to_boot_append_entries(new_entry);
857 } else {
858 add_to_app_classpath_entries(current, path, new_entry, check_for_duplicates);
859 }
860 return true;
861 } else {
862 return false;
863 }
864 }
865
866 static void print_module_entry_table(const GrowableArray<ModuleClassPathList*>* const module_list) {
867 ResourceMark rm;
868 int num_of_entries = module_list->length();
869 for (int i = 0; i < num_of_entries; i++) {
870 ClassPathEntry* e;
871 ModuleClassPathList* mpl = module_list->at(i);
872 tty->print("%s=", mpl->module_name()->as_C_string());
873 e = mpl->module_first_entry();
874 while (e != NULL) {
875 tty->print("%s", e->name());
876 e = e->next();
877 if (e != NULL) {
878 tty->print("%s", os::path_separator());
879 }
880 }
881 tty->print(" ;");
882 }
883 }
884
885 void ClassLoader::print_bootclasspath() {
886 ClassPathEntry* e;
887 tty->print("[bootclasspath= ");
888
889 // Print --patch-module module/path specifications first
890 if (_patch_mod_entries != NULL) {
891 print_module_entry_table(_patch_mod_entries);
892 }
893
894 // [jimage | exploded modules build]
895 if (has_jrt_entry()) {
896 // Print the location of the java runtime image
897 tty->print("%s ;", _jrt_entry->name());
898 } else {
899 // Print exploded module build path specifications
900 if (_exploded_entries != NULL) {
901 print_module_entry_table(_exploded_entries);
902 }
903 }
904
905 // appended entries
906 e = first_append_entry();
907 while (e != NULL) {
908 tty->print("%s ;", e->name());
909 e = e->next();
910 }
911 tty->print_cr("]");
912 }
913
914 void* ClassLoader::dll_lookup(void* lib, const char* name, const char* path) {
915 void* func = os::dll_lookup(lib, name);
916 if (func == NULL) {
917 char msg[256] = "";
918 jio_snprintf(msg, sizeof(msg), "Could not resolve \"%s\"", name);
919 vm_exit_during_initialization(msg, path);
920 }
921 return func;
922 }
923
924 void ClassLoader::load_java_library() {
925 assert(CanonicalizeEntry == NULL, "should not load java library twice");
926 void *javalib_handle = os::native_java_library();
927 if (javalib_handle == NULL) {
928 vm_exit_during_initialization("Unable to load java library", NULL);
929 }
930
931 CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, dll_lookup(javalib_handle, "JDK_Canonicalize", NULL));
932 }
933
934 void ClassLoader::release_load_zip_library() {
935 MutexLocker locker(Zip_lock, Monitor::_no_safepoint_check_flag);
936 if (_libzip_loaded == 0) {
937 load_zip_library();
938 Atomic::release_store(&_libzip_loaded, 1);
939 }
940 }
941
942 void ClassLoader::load_zip_library() {
943 assert(ZipOpen == NULL, "should not load zip library twice");
944 char path[JVM_MAXPATHLEN];
945 char ebuf[1024];
946 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
947 _zip_handle = os::dll_load(path, ebuf, sizeof ebuf);
948 }
949 if (_zip_handle == NULL) {
950 vm_exit_during_initialization("Unable to load zip library", path);
951 }
952
953 ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, dll_lookup(_zip_handle, "ZIP_Open", path));
954 ZipClose = CAST_TO_FN_PTR(ZipClose_t, dll_lookup(_zip_handle, "ZIP_Close", path));
955 FindEntry = CAST_TO_FN_PTR(FindEntry_t, dll_lookup(_zip_handle, "ZIP_FindEntry", path));
956 ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, dll_lookup(_zip_handle, "ZIP_ReadEntry", path));
957 GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, dll_lookup(_zip_handle, "ZIP_GetNextEntry", path));
958 Crc32 = CAST_TO_FN_PTR(Crc32_t, dll_lookup(_zip_handle, "ZIP_CRC32", path));
959 }
960
961 void ClassLoader::load_jimage_library() {
962 assert(JImageOpen == NULL, "should not load jimage library twice");
963 char path[JVM_MAXPATHLEN];
964 char ebuf[1024];
965 void* handle = NULL;
966 if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "jimage")) {
967 handle = os::dll_load(path, ebuf, sizeof ebuf);
968 }
969 if (handle == NULL) {
970 vm_exit_during_initialization("Unable to load jimage library", path);
971 }
972
973 JImageOpen = CAST_TO_FN_PTR(JImageOpen_t, dll_lookup(handle, "JIMAGE_Open", path));
974 JImageClose = CAST_TO_FN_PTR(JImageClose_t, dll_lookup(handle, "JIMAGE_Close", path));
975 JImageFindResource = CAST_TO_FN_PTR(JImageFindResource_t, dll_lookup(handle, "JIMAGE_FindResource", path));
976 JImageGetResource = CAST_TO_FN_PTR(JImageGetResource_t, dll_lookup(handle, "JIMAGE_GetResource", path));
977 }
978
979 int ClassLoader::crc32(int crc, const char* buf, int len) {
980 load_zip_library_if_needed();
981 return (*Crc32)(crc, (const jbyte*)buf, len);
982 }
983
984 oop ClassLoader::get_system_package(const char* name, TRAPS) {
985 // Look up the name in the boot loader's package entry table.
986 if (name != NULL) {
987 TempNewSymbol package_sym = SymbolTable::new_symbol(name);
988 // Look for the package entry in the boot loader's package entry table.
989 PackageEntry* package =
990 ClassLoaderData::the_null_class_loader_data()->packages()->lookup_only(package_sym);
991
992 // Return NULL if package does not exist or if no classes in that package
993 // have been loaded.
994 if (package != NULL && package->has_loaded_class()) {
995 ModuleEntry* module = package->module();
996 if (module->location() != NULL) {
997 ResourceMark rm(THREAD);
998 Handle ml = java_lang_String::create_from_str(
999 module->location()->as_C_string(), THREAD);
1000 return ml();
1001 }
1002 // Return entry on boot loader class path.
1003 Handle cph = java_lang_String::create_from_str(
1004 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
1005 return cph();
1006 }
1007 }
1008 return NULL;
1009 }
1010
1011 objArrayOop ClassLoader::get_system_packages(TRAPS) {
1012 ResourceMark rm(THREAD);
1013 // List of pointers to PackageEntrys that have loaded classes.
1014 PackageEntryTable* pe_table =
1015 ClassLoaderData::the_null_class_loader_data()->packages();
1016 GrowableArray<PackageEntry*>* loaded_class_pkgs = pe_table->get_system_packages();
1017
1018 // Allocate objArray and fill with java.lang.String
1019 objArrayOop r = oopFactory::new_objArray(vmClasses::String_klass(),
1020 loaded_class_pkgs->length(), CHECK_NULL);
1021 objArrayHandle result(THREAD, r);
1022 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
1023 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1024 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1025 result->obj_at_put(x, str());
1026 }
1027 return result();
1028 }
1029
1030 // caller needs ResourceMark
1031 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1032 int class_name_len) {
1033 assert(class_name != NULL, "invariant");
1034 assert((int)strlen(class_name) == class_name_len, "invariant");
1035
1036 static const char class_suffix[] = ".class";
1037 size_t class_suffix_len = sizeof(class_suffix);
1038
1039 char* const file_name = NEW_RESOURCE_ARRAY(char,
1040 class_name_len +
1041 class_suffix_len); // includes term NULL
1042
1043 strncpy(file_name, class_name, class_name_len);
1044 strncpy(&file_name[class_name_len], class_suffix, class_suffix_len);
1045
1046 return file_name;
1047 }
1048
1049 ClassPathEntry* find_first_module_cpe(ModuleEntry* mod_entry,
1050 const GrowableArray<ModuleClassPathList*>* const module_list) {
1051 int num_of_entries = module_list->length();
1052 const Symbol* class_module_name = mod_entry->name();
1053
1054 // Loop through all the modules in either the patch-module or exploded entries looking for module
1055 for (int i = 0; i < num_of_entries; i++) {
1056 ModuleClassPathList* module_cpl = module_list->at(i);
1057 Symbol* module_cpl_name = module_cpl->module_name();
1058
1059 if (module_cpl_name->fast_compare(class_module_name) == 0) {
1060 // Class' module has been located.
1061 return module_cpl->module_first_entry();
1062 }
1063 }
1064 return NULL;
1065 }
1066
1067
1068 // Search either the patch-module or exploded build entries for class.
1069 ClassFileStream* ClassLoader::search_module_entries(JavaThread* current,
1070 const GrowableArray<ModuleClassPathList*>* const module_list,
1071 const char* const class_name,
1072 const char* const file_name) {
1073 ClassFileStream* stream = NULL;
1074
1075 // Find the class' defining module in the boot loader's module entry table
1076 TempNewSymbol class_name_symbol = SymbolTable::new_symbol(class_name);
1077 TempNewSymbol pkg_name = package_from_class_name(class_name_symbol);
1078 PackageEntry* pkg_entry = get_package_entry(pkg_name, ClassLoaderData::the_null_class_loader_data());
1079 ModuleEntry* mod_entry = (pkg_entry != NULL) ? pkg_entry->module() : NULL;
1080
1081 // If the module system has not defined java.base yet, then
1082 // classes loaded are assumed to be defined to java.base.
1083 // When java.base is eventually defined by the module system,
1084 // all packages of classes that have been previously loaded
1085 // are verified in ModuleEntryTable::verify_javabase_packages().
1086 if (!Universe::is_module_initialized() &&
1087 !ModuleEntryTable::javabase_defined() &&
1088 mod_entry == NULL) {
1089 mod_entry = ModuleEntryTable::javabase_moduleEntry();
1090 }
1091
1092 // The module must be a named module
1093 ClassPathEntry* e = NULL;
1094 if (mod_entry != NULL && mod_entry->is_named()) {
1095 if (module_list == _exploded_entries) {
1096 // The exploded build entries can be added to at any time so a lock is
1097 // needed when searching them.
1098 assert(!ClassLoader::has_jrt_entry(), "Must be exploded build");
1099 MutexLocker ml(current, Module_lock);
1100 e = find_first_module_cpe(mod_entry, module_list);
1101 } else {
1102 e = find_first_module_cpe(mod_entry, module_list);
1103 }
1104 }
1105
1106 // Try to load the class from the module's ClassPathEntry list.
1107 while (e != NULL) {
1108 stream = e->open_stream(current, file_name);
1109 // No context.check is required since CDS is not supported
1110 // for an exploded modules build or if --patch-module is specified.
1111 if (NULL != stream) {
1112 return stream;
1113 }
1114 e = e->next();
1115 }
1116 // If the module was located, break out even if the class was not
1117 // located successfully from that module's ClassPathEntry list.
1118 // There will not be another valid entry for that module.
1119 return NULL;
1120 }
1121
1122 // Called by the boot classloader to load classes
1123 InstanceKlass* ClassLoader::load_class(Symbol* name, bool search_append_only, TRAPS) {
1124 assert(name != NULL, "invariant");
1125
1126 ResourceMark rm(THREAD);
1127 HandleMark hm(THREAD);
1128
1129 const char* const class_name = name->as_C_string();
1130
1131 EventMarkClassLoading m("Loading class %s", class_name);
1132
1133 const char* const file_name = file_name_for_class_name(class_name,
1134 name->utf8_length());
1135 assert(file_name != NULL, "invariant");
1136
1137 // Lookup stream for parsing .class file
1138 ClassFileStream* stream = NULL;
1139 s2 classpath_index = 0;
1140 ClassPathEntry* e = NULL;
1141
1142 // If search_append_only is true, boot loader visibility boundaries are
1143 // set to be _first_append_entry to the end. This includes:
1144 // [-Xbootclasspath/a]; [jvmti appended entries]
1145 //
1146 // If search_append_only is false, boot loader visibility boundaries are
1147 // set to be the --patch-module entries plus the base piece. This includes:
1148 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1149 //
1150
1151 // Load Attempt #1: --patch-module
1152 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1153 // attempt to load the class from those locations specific to the module.
1154 // Specifications to --patch-module can contain a partial number of classes
1155 // that are part of the overall module definition. So if a particular class is not
1156 // found within its module specification, the search should continue to Load Attempt #2.
1157 // Note: The --patch-module entries are never searched if the boot loader's
1158 // visibility boundary is limited to only searching the append entries.
1159 if (_patch_mod_entries != NULL && !search_append_only) {
1160 // At CDS dump time, the --patch-module entries are ignored. That means a
1161 // class is still loaded from the runtime image even if it might
1162 // appear in the _patch_mod_entries. The runtime shared class visibility
1163 // check will determine if a shared class is visible based on the runtime
1164 // environment, including the runtime --patch-module setting.
1165 //
1166 // DynamicDumpSharedSpaces requires UseSharedSpaces to be enabled. Since --patch-module
1167 // is not supported with UseSharedSpaces, it is not supported with DynamicDumpSharedSpaces.
1168 assert(!DynamicDumpSharedSpaces, "sanity");
1169 if (!DumpSharedSpaces) {
1170 stream = search_module_entries(THREAD, _patch_mod_entries, class_name, file_name);
1171 }
1172 }
1173
1174 // Load Attempt #2: [jimage | exploded build]
1175 if (!search_append_only && (NULL == stream)) {
1176 if (has_jrt_entry()) {
1177 e = _jrt_entry;
1178 stream = _jrt_entry->open_stream(THREAD, file_name);
1179 } else {
1180 // Exploded build - attempt to locate class in its defining module's location.
1181 assert(_exploded_entries != NULL, "No exploded build entries present");
1182 stream = search_module_entries(THREAD, _exploded_entries, class_name, file_name);
1183 }
1184 }
1185
1186 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1187 if (search_append_only && (NULL == stream)) {
1188 // For the boot loader append path search, the starting classpath_index
1189 // for the appended piece is always 1 to account for either the
1190 // _jrt_entry or the _exploded_entries.
1191 assert(classpath_index == 0, "The classpath_index has been incremented incorrectly");
1192 classpath_index = 1;
1193
1194 e = first_append_entry();
1195 while (e != NULL) {
1196 stream = e->open_stream(THREAD, file_name);
1197 if (NULL != stream) {
1198 break;
1199 }
1200 e = e->next();
1201 ++classpath_index;
1202 }
1203 }
1204
1205 if (NULL == stream) {
1206 return NULL;
1207 }
1208
1209 stream->set_verify(ClassLoaderExt::should_verify(classpath_index));
1210
1211 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1212 Handle protection_domain;
1213 ClassLoadInfo cl_info(protection_domain);
1214
1215 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1216 name,
1217 loader_data,
1218 cl_info,
1219 CHECK_NULL);
1220 result->set_classpath_index(classpath_index);
1221 return result;
1222 }
1223
1224 #if INCLUDE_CDS
1225 char* ClassLoader::skip_uri_protocol(char* source) {
1226 if (strncmp(source, "file:", 5) == 0) {
1227 // file: protocol path could start with file:/ or file:///
1228 // locate the char after all the forward slashes
1229 int offset = 5;
1230 while (*(source + offset) == '/') {
1231 offset++;
1232 }
1233 source += offset;
1234 // for non-windows platforms, move back one char as the path begins with a '/'
1235 #ifndef _WINDOWS
1236 source -= 1;
1237 #endif
1238 } else if (strncmp(source, "jrt:/", 5) == 0) {
1239 source += 5;
1240 }
1241 return source;
1242 }
1243
1244 // Record the shared classpath index and loader type for classes loaded
1245 // by the builtin loaders at dump time.
1246 void ClassLoader::record_result(JavaThread* current, InstanceKlass* ik,
1247 const ClassFileStream* stream, bool redefined) {
1248 Arguments::assert_is_dumping_archive();
1249 assert(stream != NULL, "sanity");
1250
1251 if (ik->is_hidden()) {
1252 // We do not archive hidden classes.
1253 return;
1254 }
1255
1256 oop loader = ik->class_loader();
1257 char* src = (char*)stream->source();
1258 if (src == NULL) {
1259 if (loader == NULL) {
1260 // JFR classes
1261 ik->set_shared_classpath_index(0);
1262 ik->set_shared_class_loader_type(ClassLoader::BOOT_LOADER);
1263 }
1264 return;
1265 }
1266
1267 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1268
1269 ResourceMark rm(current);
1270 int classpath_index = -1;
1271 PackageEntry* pkg_entry = ik->package();
1272
1273 if (FileMapInfo::get_number_of_shared_paths() > 0) {
1274 // Save the path from the file: protocol or the module name from the jrt: protocol
1275 // if no protocol prefix is found, path is the same as stream->source(). This path
1276 // must be valid since the class has been successfully parsed.
1277 char* path = skip_uri_protocol(src);
1278 assert(path != NULL, "sanity");
1279 for (int i = 0; i < FileMapInfo::get_number_of_shared_paths(); i++) {
1280 SharedClassPathEntry* ent = FileMapInfo::shared_path(i);
1281 // A shared path has been validated during its creation in ClassLoader::create_class_path_entry(),
1282 // it must be valid here.
1283 assert(ent->name() != NULL, "sanity");
1284 // If the path (from the class stream source) is the same as the shared
1285 // class or module path, then we have a match.
1286 // src may come from the App/Platform class loaders, which would canonicalize
1287 // the file name. We cannot use strcmp to check for equality against ent->name().
1288 // We must use os::same_files (which is faster than canonicalizing ent->name()).
1289 if (os::same_files(ent->name(), path)) {
1290 // NULL pkg_entry and pkg_entry in an unnamed module implies the class
1291 // is from the -cp or boot loader append path which consists of -Xbootclasspath/a
1292 // and jvmti appended entries.
1293 if ((pkg_entry == NULL) || (pkg_entry->in_unnamed_module())) {
1294 // Ensure the index is within the -cp range before assigning
1295 // to the classpath_index.
1296 if (SystemDictionary::is_system_class_loader(loader) &&
1297 (i >= ClassLoaderExt::app_class_paths_start_index()) &&
1298 (i < ClassLoaderExt::app_module_paths_start_index())) {
1299 classpath_index = i;
1300 break;
1301 } else {
1302 if ((i >= 1) &&
1303 (i < ClassLoaderExt::app_class_paths_start_index())) {
1304 // The class must be from boot loader append path which consists of
1305 // -Xbootclasspath/a and jvmti appended entries.
1306 assert(loader == NULL, "sanity");
1307 classpath_index = i;
1308 break;
1309 }
1310 }
1311 } else {
1312 // A class from a named module from the --module-path. Ensure the index is
1313 // within the --module-path range before assigning to the classpath_index.
1314 if ((pkg_entry != NULL) && !(pkg_entry->in_unnamed_module()) && (i > 0)) {
1315 if (i >= ClassLoaderExt::app_module_paths_start_index() &&
1316 i < FileMapInfo::get_number_of_shared_paths()) {
1317 classpath_index = i;
1318 break;
1319 }
1320 }
1321 }
1322 }
1323 // for index 0 and the stream->source() is the modules image or has the jrt: protocol.
1324 // The class must be from the runtime modules image.
1325 if (i == 0 && (stream->from_boot_loader_modules_image() || string_starts_with(src, "jrt:"))) {
1326 classpath_index = i;
1327 break;
1328 }
1329 }
1330
1331 // No path entry found for this class: most likely a shared class loaded by the
1332 // user defined classloader.
1333 if (classpath_index < 0 && !SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
1334 assert(ik->shared_classpath_index() < 0, "not assigned yet");
1335 ik->set_shared_classpath_index(UNREGISTERED_INDEX);
1336 SystemDictionaryShared::set_shared_class_misc_info(ik, (ClassFileStream*)stream);
1337 return;
1338 }
1339 } else {
1340 // The shared path table is set up after module system initialization.
1341 // The path table contains no entry before that. Any classes loaded prior
1342 // to the setup of the shared path table must be from the modules image.
1343 assert(stream->from_boot_loader_modules_image(), "stream must be loaded by boot loader from modules image");
1344 assert(FileMapInfo::get_number_of_shared_paths() == 0, "shared path table must not have been setup");
1345 classpath_index = 0;
1346 }
1347
1348 const char* const class_name = ik->name()->as_C_string();
1349 const char* const file_name = file_name_for_class_name(class_name,
1350 ik->name()->utf8_length());
1351 assert(file_name != NULL, "invariant");
1352
1353 ClassLoaderExt::record_result(classpath_index, ik, redefined);
1354 }
1355 #endif // INCLUDE_CDS
1356
1357 // Initialize the class loader's access to methods in libzip. Parse and
1358 // process the boot classpath into a list ClassPathEntry objects. Once
1359 // this list has been created, it must not change order (see class PackageInfo)
1360 // it can be appended to and is by jvmti.
1361
1362 void ClassLoader::initialize(TRAPS) {
1363 if (UsePerfData) {
1364 // jvmstat performance counters
1365 NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
1366 NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
1367 NEWPERFTICKCOUNTER(_perf_class_init_selftime, SUN_CLS, "classInitTime.self");
1368 NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
1369 NEWPERFTICKCOUNTER(_perf_class_verify_selftime, SUN_CLS, "classVerifyTime.self");
1370 NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
1371 NEWPERFTICKCOUNTER(_perf_class_link_selftime, SUN_CLS, "classLinkedTime.self");
1372 NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
1373 NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
1374 NEWPERFEVENTCOUNTER(_perf_classes_verified, SUN_CLS, "verifiedClasses");
1375
1376 NEWPERFTICKCOUNTER(_perf_sys_class_lookup_time, SUN_CLS, "lookupSysClassTime");
1377 NEWPERFTICKCOUNTER(_perf_shared_classload_time, SUN_CLS, "sharedClassLoadTime");
1378 NEWPERFTICKCOUNTER(_perf_sys_classload_time, SUN_CLS, "sysClassLoadTime");
1379 NEWPERFTICKCOUNTER(_perf_app_classload_time, SUN_CLS, "appClassLoadTime");
1380 NEWPERFTICKCOUNTER(_perf_app_classload_selftime, SUN_CLS, "appClassLoadTime.self");
1381 NEWPERFEVENTCOUNTER(_perf_app_classload_count, SUN_CLS, "appClassLoadCount");
1382 NEWPERFTICKCOUNTER(_perf_define_appclasses, SUN_CLS, "defineAppClasses");
1383 NEWPERFTICKCOUNTER(_perf_define_appclass_time, SUN_CLS, "defineAppClassTime");
1384 NEWPERFTICKCOUNTER(_perf_define_appclass_selftime, SUN_CLS, "defineAppClassTime.self");
1385 NEWPERFBYTECOUNTER(_perf_app_classfile_bytes_read, SUN_CLS, "appClassBytes");
1386 NEWPERFBYTECOUNTER(_perf_sys_classfile_bytes_read, SUN_CLS, "sysClassBytes");
1387
1388 NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS, "unsafeDefineClassCalls");
1389 }
1390
1391 // lookup java library entry points
1392 load_java_library();
1393 // jimage library entry points are loaded below, in lookup_vm_options
1394 setup_bootstrap_search_path(THREAD);
1395 }
1396
1397 char* lookup_vm_resource(JImageFile *jimage, const char *jimage_version, const char *path) {
1398 jlong size;
1399 JImageLocationRef location = (*JImageFindResource)(jimage, "java.base", jimage_version, path, &size);
1400 if (location == 0)
1401 return NULL;
1402 char *val = NEW_C_HEAP_ARRAY(char, size+1, mtClass);
1403 (*JImageGetResource)(jimage, location, val, size);
1404 val[size] = '\0';
1405 return val;
1406 }
1407
1408 // Lookup VM options embedded in the modules jimage file
1409 char* ClassLoader::lookup_vm_options() {
1410 jint error;
1411 char modules_path[JVM_MAXPATHLEN];
1412 const char* fileSep = os::file_separator();
1413
1414 // Initialize jimage library entry points
1415 load_jimage_library();
1416
1417 jio_snprintf(modules_path, JVM_MAXPATHLEN, "%s%slib%smodules", Arguments::get_java_home(), fileSep, fileSep);
1418 JImage_file =(*JImageOpen)(modules_path, &error);
1419 if (JImage_file == NULL) {
1420 return NULL;
1421 }
1422
1423 const char *jimage_version = get_jimage_version_string();
1424 char *options = lookup_vm_resource(JImage_file, jimage_version, "jdk/internal/vm/options");
1425 return options;
1426 }
1427
1428 #if INCLUDE_CDS
1429 void ClassLoader::initialize_shared_path(JavaThread* current) {
1430 if (Arguments::is_dumping_archive()) {
1431 ClassLoaderExt::setup_search_paths(current);
1432 }
1433 }
1434
1435 void ClassLoader::initialize_module_path(TRAPS) {
1436 if (Arguments::is_dumping_archive()) {
1437 ClassLoaderExt::setup_module_paths(THREAD);
1438 FileMapInfo::allocate_shared_path_table(CHECK);
1439 }
1440 }
1441
1442 // Helper function used by CDS code to get the number of module path
1443 // entries during shared classpath setup time.
1444 int ClassLoader::num_module_path_entries() {
1445 Arguments::assert_is_dumping_archive();
1446 int num_entries = 0;
1447 ClassPathEntry* e= ClassLoader::_module_path_entries;
1448 while (e != NULL) {
1449 num_entries ++;
1450 e = e->next();
1451 }
1452 return num_entries;
1453 }
1454 #endif
1455
1456 jlong ClassLoader::classloader_time_ms() {
1457 return UsePerfData ?
1458 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1459 }
1460
1461 jlong ClassLoader::class_init_count() {
1462 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1463 }
1464
1465 jlong ClassLoader::class_init_time_ms() {
1466 return UsePerfData ?
1467 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1468 }
1469
1470 jlong ClassLoader::class_verify_time_ms() {
1471 return UsePerfData ?
1472 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1473 }
1474
1475 jlong ClassLoader::class_link_count() {
1476 return UsePerfData ? _perf_classes_linked->get_value() : -1;
1477 }
1478
1479 jlong ClassLoader::class_link_time_ms() {
1480 return UsePerfData ?
1481 Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
1482 }
1483
1484 int ClassLoader::compute_Object_vtable() {
1485 // hardwired for JDK1.2 -- would need to duplicate class file parsing
1486 // code to determine actual value from file
1487 // Would be value '11' if finals were in vtable
1488 int JDK_1_2_Object_vtable_size = 5;
1489 return JDK_1_2_Object_vtable_size * vtableEntry::size();
1490 }
1491
1492
1493 void classLoader_init1() {
1494 EXCEPTION_MARK;
1495 ClassLoader::initialize(THREAD);
1496 if (HAS_PENDING_EXCEPTION) {
1497 vm_exit_during_initialization("ClassLoader::initialize() failed unexpectedly");
1498 }
1499 }
1500
1501 // Complete the ClassPathEntry setup for the boot loader
1502 void ClassLoader::classLoader_init2(JavaThread* current) {
1503 // Setup the list of module/path pairs for --patch-module processing
1504 // This must be done after the SymbolTable is created in order
1505 // to use fast_compare on module names instead of a string compare.
1506 if (Arguments::get_patch_mod_prefix() != NULL) {
1507 setup_patch_mod_entries();
1508 }
1509
1510 // Create the ModuleEntry for java.base (must occur after setup_patch_mod_entries
1511 // to successfully determine if java.base has been patched)
1512 create_javabase();
1513
1514 // Setup the initial java.base/path pair for the exploded build entries.
1515 // As more modules are defined during module system initialization, more
1516 // entries will be added to the exploded build array.
1517 if (!has_jrt_entry()) {
1518 assert(!DumpSharedSpaces, "DumpSharedSpaces not supported with exploded module builds");
1519 assert(!DynamicDumpSharedSpaces, "DynamicDumpSharedSpaces not supported with exploded module builds");
1520 assert(!UseSharedSpaces, "UsedSharedSpaces not supported with exploded module builds");
1521 // Set up the boot loader's _exploded_entries list. Note that this gets
1522 // done before loading any classes, by the same thread that will
1523 // subsequently do the first class load. So, no lock is needed for this.
1524 assert(_exploded_entries == NULL, "Should only get initialized once");
1525 _exploded_entries = new (ResourceObj::C_HEAP, mtModule)
1526 GrowableArray<ModuleClassPathList*>(EXPLODED_ENTRY_SIZE, mtModule);
1527 add_to_exploded_build_list(current, vmSymbols::java_base());
1528 }
1529 }
1530
1531 char* ClassLoader::get_canonical_path(const char* orig, Thread* thread) {
1532 assert(orig != NULL, "bad arguments");
1533 // caller needs to allocate ResourceMark for the following output buffer
1534 char* canonical_path = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, JVM_MAXPATHLEN);
1535 ResourceMark rm(thread);
1536 // os::native_path writes into orig_copy
1537 char* orig_copy = NEW_RESOURCE_ARRAY_IN_THREAD(thread, char, strlen(orig)+1);
1538 strcpy(orig_copy, orig);
1539 if ((CanonicalizeEntry)(os::native_path(orig_copy), canonical_path, JVM_MAXPATHLEN) < 0) {
1540 return NULL;
1541 }
1542 return canonical_path;
1543 }
1544
1545 void ClassLoader::create_javabase() {
1546 JavaThread* current = JavaThread::current();
1547
1548 // Create java.base's module entry for the boot
1549 // class loader prior to loading j.l.Object.
1550 ClassLoaderData* null_cld = ClassLoaderData::the_null_class_loader_data();
1551
1552 // Get module entry table
1553 ModuleEntryTable* null_cld_modules = null_cld->modules();
1554 if (null_cld_modules == NULL) {
1555 vm_exit_during_initialization("No ModuleEntryTable for the boot class loader");
1556 }
1557
1558 {
1559 MutexLocker ml(current, Module_lock);
1560 if (ModuleEntryTable::javabase_moduleEntry() == NULL) { // may have been inited by CDS.
1561 ModuleEntry* jb_module = null_cld_modules->locked_create_entry(Handle(),
1562 false, vmSymbols::java_base(), NULL, NULL, null_cld);
1563 if (jb_module == NULL) {
1564 vm_exit_during_initialization("Unable to create ModuleEntry for " JAVA_BASE_NAME);
1565 }
1566 ModuleEntryTable::set_javabase_moduleEntry(jb_module);
1567 }
1568 }
1569 }
1570
1571 // Please keep following two functions at end of this file. With them placed at top or in middle of the file,
1572 // they could get inlined by aggressive compiler, an unknown trick, see bug 6966589.
1573 void PerfClassTraceTime::initialize() {
1574 if (!UsePerfData) return;
1575
1576 if (_eventp != NULL) {
1577 // increment the event counter
1578 _eventp->inc();
1579 }
1580
1581 // stop the current active thread-local timer to measure inclusive time
1582 _prev_active_event = -1;
1583 for (int i=0; i < EVENT_TYPE_COUNT; i++) {
1584 if (_timers[i].is_active()) {
1585 assert(_prev_active_event == -1, "should have only one active timer");
1586 _prev_active_event = i;
1587 _timers[i].stop();
1588 }
1589 }
1590
1591 if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
1592 // start the inclusive timer if not recursively called
1593 _t.start();
1594 }
1595
1596 // start thread-local timer of the given event type
1597 if (!_timers[_event_type].is_active()) {
1598 _timers[_event_type].start();
1599 }
1600 }
1601
1602 PerfClassTraceTime::~PerfClassTraceTime() {
1603 if (!UsePerfData) return;
1604
1605 // stop the thread-local timer as the event completes
1606 // and resume the thread-local timer of the event next on the stack
1607 _timers[_event_type].stop();
1608 jlong selftime = _timers[_event_type].ticks();
1609
1610 if (_prev_active_event >= 0) {
1611 _timers[_prev_active_event].start();
1612 }
1613
1614 if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
1615
1616 // increment the counters only on the leaf call
1617 _t.stop();
1618 _timep->inc(_t.ticks());
1619 if (_selftimep != NULL) {
1620 _selftimep->inc(selftime);
1621 }
1622 // add all class loading related event selftime to the accumulated time counter
1623 ClassLoader::perf_accumulated_time()->inc(selftime);
1624
1625 // reset the timer
1626 _timers[_event_type].reset();
1627 }