1 /*
2 * Copyright (c) 2016, 2026, 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/aotGrowableArray.inline.hpp"
27 #include "cds/archiveBuilder.hpp"
28 #include "cds/archiveUtils.hpp"
29 #include "cds/cdsConfig.hpp"
30 #include "cds/heapShared.hpp"
31 #include "classfile/classLoader.hpp"
32 #include "classfile/classLoaderData.inline.hpp"
33 #include "classfile/classLoaderDataShared.hpp"
34 #include "classfile/javaClasses.inline.hpp"
35 #include "classfile/moduleEntry.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/systemDictionaryShared.hpp"
38 #include "jni.h"
39 #include "logging/log.hpp"
40 #include "logging/logStream.hpp"
41 #include "memory/metadataFactory.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "memory/universe.hpp"
44 #include "oops/oopHandle.inline.hpp"
45 #include "oops/symbol.hpp"
46 #include "runtime/handles.inline.hpp"
47 #include "runtime/safepoint.hpp"
48 #include "utilities/events.hpp"
49 #include "utilities/hashTable.hpp"
50 #include "utilities/ostream.hpp"
51 #include "utilities/quickSort.hpp"
52
53 ModuleEntry* ModuleEntryTable::_javabase_module = nullptr;
54
55 oop ModuleEntry::module_oop() const { return _module_handle.resolve(); }
56
57 void ModuleEntry::set_location(Symbol* location) {
58 // _location symbol's refcounts are managed by ModuleEntry,
59 // must decrement the old one before updating.
60 Symbol::maybe_decrement_refcount(_location);
61
62 _location = location;
63
64 if (location != nullptr) {
65 location->increment_refcount();
66 CDS_ONLY(if (CDSConfig::is_using_archive()) {
67 _shared_path_index = AOTClassLocationConfig::runtime()->get_module_shared_path_index(_location);
68 });
69 }
70 }
71
72 // Return true if the module's version should be displayed in error messages,
73 // logging, etc.
74 // Return false if the module's version is null, if it is unnamed, or if the
75 // module is not an upgradeable module.
76 // Detect if the module is not upgradeable by checking:
77 // 1. Module location is "jrt:/java." and its loader is boot or platform
78 // 2. Module location is "jrt:/jdk.", its loader is one of the builtin loaders
79 // and its version is the same as module java.base's version
80 // The above check is imprecise but should work in almost all cases.
81 bool ModuleEntry::should_show_version() {
82 if (version() == nullptr || !is_named()) return false;
83
84 if (location() != nullptr) {
85 ResourceMark rm;
86 const char* loc = location()->as_C_string();
87 ClassLoaderData* cld = loader_data();
88
89 assert(!cld->has_class_mirror_holder(), "module's cld should have a ClassLoader holder not a Class holder");
90 if ((cld->is_the_null_class_loader_data() || cld->is_platform_class_loader_data()) &&
91 (strncmp(loc, "jrt:/java.", 10) == 0)) {
92 return false;
93 }
94 if ((ModuleEntryTable::javabase_moduleEntry()->version()->fast_compare(version()) == 0) &&
95 cld->is_permanent_class_loader_data() && (strncmp(loc, "jrt:/jdk.", 9) == 0)) {
96 return false;
97 }
98 }
99 return true;
100 }
101
102 void ModuleEntry::set_version(Symbol* version) {
103 // _version symbol's refcounts are managed by ModuleEntry,
104 // must decrement the old one before updating.
105 Symbol::maybe_decrement_refcount(_version);
106
107 _version = version;
108
109 Symbol::maybe_increment_refcount(version);
110 }
111
112 // Returns the shared ProtectionDomain
113 oop ModuleEntry::shared_protection_domain() {
114 return _shared_pd.resolve();
115 }
116
117 // Set the shared ProtectionDomain atomically
118 void ModuleEntry::set_shared_protection_domain(ClassLoaderData *loader_data,
119 Handle pd_h) {
120 // Create a handle for the shared ProtectionDomain and save it atomically.
121 // init_handle_locked checks if someone beats us setting the _shared_pd cache.
122 loader_data->init_handle_locked(_shared_pd, pd_h);
123 }
124
125 // Returns true if this module can read module m
126 bool ModuleEntry::can_read(ModuleEntry* m) const {
127 assert(m != nullptr, "No module to lookup in this module's reads list");
128
129 // Unnamed modules read everyone and all modules
130 // read java.base. If either of these conditions
131 // hold, readability has been established.
132 if (!this->is_named() ||
133 (m == ModuleEntryTable::javabase_moduleEntry())) {
134 return true;
135 }
136
137 MutexLocker m1(Module_lock);
138 // This is a guard against possible race between agent threads that redefine
139 // or retransform classes in this module. Only one of them is adding the
140 // default read edges to the unnamed modules of the boot and app class loaders
141 // with an upcall to jdk.internal.module.Modules.transformedByAgent.
142 // At the same time, another thread can instrument the module classes by
143 // injecting dependencies that require the default read edges for resolution.
144 if (this->has_default_read_edges() && !m->is_named()) {
145 ClassLoaderData* cld = m->loader_data();
146 assert(!cld->has_class_mirror_holder(), "module's cld should have a ClassLoader holder not a Class holder");
147 if (cld->is_the_null_class_loader_data() || cld->is_system_class_loader_data()) {
148 return true; // default read edge
149 }
150 }
151 if (!has_reads_list()) {
152 return false;
153 } else {
154 return reads()->contains(m);
155 }
156 }
157
158 // Add a new module to this module's reads list
159 void ModuleEntry::add_read(ModuleEntry* m) {
160 // Unnamed module is special cased and can read all modules
161 if (!is_named()) {
162 return;
163 }
164
165 MutexLocker m1(Module_lock);
166 if (m == nullptr) {
167 set_can_read_all_unnamed();
168 } else {
169 if (reads() == nullptr) {
170 // Lazily create a module's reads list
171 AOTGrowableArray<ModuleEntry*>* new_reads = new (mtModule) AOTGrowableArray<ModuleEntry*>(MODULE_READS_SIZE, mtModule);
172 set_reads(new_reads);
173 }
174
175 // Determine, based on this newly established read edge to module m,
176 // if this module's read list should be walked at a GC safepoint.
177 set_read_walk_required(m->loader_data());
178
179 // Establish readability to module m
180 reads()->append_if_missing(m);
181 }
182 }
183
184 // If the module's loader, that a read edge is being established to, is
185 // not the same loader as this module's and is not one of the 3 builtin
186 // class loaders, then this module's reads list must be walked at GC
187 // safepoint. Modules have the same life cycle as their defining class
188 // loaders and should be removed if dead.
189 void ModuleEntry::set_read_walk_required(ClassLoaderData* m_loader_data) {
190 assert(is_named(), "Cannot call set_read_walk_required on unnamed module");
191 assert_locked_or_safepoint(Module_lock);
192 if (!_must_walk_reads &&
193 loader_data() != m_loader_data &&
194 !m_loader_data->is_builtin_class_loader_data()) {
195 _must_walk_reads = true;
196 if (log_is_enabled(Trace, module)) {
197 ResourceMark rm;
198 log_trace(module)("ModuleEntry::set_read_walk_required(): module %s reads list must be walked",
199 (name() != nullptr) ? name()->as_C_string() : UNNAMED_MODULE);
200 }
201 }
202 }
203
204 // Set whether the module is open, i.e. all its packages are unqualifiedly exported
205 void ModuleEntry::set_is_open(bool is_open) {
206 assert_lock_strong(Module_lock);
207 _is_open = is_open;
208 }
209
210 // Returns true if the module has a non-empty reads list. As such, the unnamed
211 // module will return false.
212 bool ModuleEntry::has_reads_list() const {
213 assert_locked_or_safepoint(Module_lock);
214 return ((reads() != nullptr) && !reads()->is_empty());
215 }
216
217 // Purge dead module entries out of reads list.
218 void ModuleEntry::purge_reads() {
219 assert_locked_or_safepoint(Module_lock);
220
221 if (_must_walk_reads && has_reads_list()) {
222 // This module's _must_walk_reads flag will be reset based
223 // on the remaining live modules on the reads list.
224 _must_walk_reads = false;
225
226 if (log_is_enabled(Trace, module)) {
227 ResourceMark rm;
228 log_trace(module)("ModuleEntry::purge_reads(): module %s reads list being walked",
229 (name() != nullptr) ? name()->as_C_string() : UNNAMED_MODULE);
230 }
231
232 // Go backwards because this removes entries that are dead.
233 int len = reads()->length();
234 for (int idx = len - 1; idx >= 0; idx--) {
235 ModuleEntry* module_idx = reads()->at(idx);
236 ClassLoaderData* cld_idx = module_idx->loader_data();
237 if (cld_idx->is_unloading()) {
238 reads()->delete_at(idx);
239 } else {
240 // Update the need to walk this module's reads based on live modules
241 set_read_walk_required(cld_idx);
242 }
243 }
244 }
245 }
246
247 void ModuleEntry::module_reads_do(ModuleClosure* f) {
248 assert_locked_or_safepoint(Module_lock);
249 assert(f != nullptr, "invariant");
250
251 if (has_reads_list()) {
252 int reads_len = reads()->length();
253 for (ModuleEntry* m : *reads()) {
254 f->do_module(m);
255 }
256 }
257 }
258
259 void ModuleEntry::delete_reads() {
260 delete reads();
261 _reads = nullptr;
262 }
263
264 ModuleEntry::ModuleEntry(Handle module_handle,
265 bool is_open, Symbol* name,
266 Symbol* version, Symbol* location,
267 ClassLoaderData* loader_data) :
268 _name(name),
269 _loader_data(loader_data),
270 _reads(nullptr),
271 _version(nullptr),
272 _location(nullptr),
273 CDS_ONLY(_shared_path_index(-1) COMMA)
274 _can_read_all_unnamed(false),
275 _has_default_read_edges(false),
276 _must_walk_reads(false),
277 _is_open(is_open),
278 _is_patched(false) {
279
280 // Initialize fields specific to a ModuleEntry
281 if (_name == nullptr) {
282 // Unnamed modules can read all other unnamed modules.
283 set_can_read_all_unnamed();
284 } else {
285 _name->increment_refcount();
286 }
287
288 if (!module_handle.is_null()) {
289 _module_handle = loader_data->add_handle(module_handle);
290 }
291
292 set_version(version);
293
294 // may need to add CDS info
295 set_location(location);
296
297 if (name != nullptr && ClassLoader::is_in_patch_mod_entries(name)) {
298 set_is_patched();
299 if (log_is_enabled(Trace, module, patch)) {
300 ResourceMark rm;
301 log_trace(module, patch)("Marked module %s as patched from --patch-module",
302 name != nullptr ? name->as_C_string() : UNNAMED_MODULE);
303 }
304 }
305
306 JFR_ONLY(INIT_ID(this);)
307 }
308
309 ModuleEntry::~ModuleEntry() {
310 // Clean out the C heap allocated reads list first before freeing the entry
311 delete_reads();
312 Symbol::maybe_decrement_refcount(_name);
313 Symbol::maybe_decrement_refcount(_version);
314 Symbol::maybe_decrement_refcount(_location);
315 }
316
317 ModuleEntry* ModuleEntry::create_unnamed_module(ClassLoaderData* cld) {
318 // The java.lang.Module for this loader's
319 // corresponding unnamed module can be found in the java.lang.ClassLoader object.
320 oop module = java_lang_ClassLoader::unnamedModule(cld->class_loader());
321
322 #if INCLUDE_CDS_JAVA_HEAP
323 ModuleEntry* archived_unnamed_module = ClassLoaderDataShared::archived_unnamed_module(cld);
324 if (archived_unnamed_module != nullptr) {
325 archived_unnamed_module->load_from_archive(cld);
326 archived_unnamed_module->restore_archived_oops(cld);
327 return archived_unnamed_module;
328 }
329 #endif
330
331 // Ensure that the unnamed module was correctly set when the class loader was constructed.
332 // Guarantee will cause a recognizable crash if the user code has circumvented calling the ClassLoader constructor.
333 ResourceMark rm;
334 guarantee(java_lang_Module::is_instance(module),
335 "The unnamed module for ClassLoader %s, is null or not an instance of java.lang.Module. The class loader has not been initialized correctly.",
336 cld->loader_name_and_id());
337
338 ModuleEntry* unnamed_module = new_unnamed_module_entry(Handle(Thread::current(), module), cld);
339
340 // Store pointer to the ModuleEntry in the unnamed module's java.lang.Module object.
341 java_lang_Module::set_module_entry(module, unnamed_module);
342
343 return unnamed_module;
344 }
345
346 ModuleEntry* ModuleEntry::create_boot_unnamed_module(ClassLoaderData* cld) {
347 #if INCLUDE_CDS_JAVA_HEAP
348 ModuleEntry* archived_unnamed_module = ClassLoaderDataShared::archived_boot_unnamed_module();
349 if (archived_unnamed_module != nullptr) {
350 archived_unnamed_module->load_from_archive(cld);
351 // It's too early to call archived_unnamed_module->restore_archived_oops(cld).
352 // We will do it inside Modules::set_bootloader_unnamed_module()
353 return archived_unnamed_module;
354 }
355 #endif
356
357 // For the boot loader, the java.lang.Module for the unnamed module
358 // is not known until a call to JVM_SetBootLoaderUnnamedModule is made. At
359 // this point initially create the ModuleEntry for the unnamed module.
360 ModuleEntry* unnamed_module = new_unnamed_module_entry(Handle(), cld);
361 assert(unnamed_module != nullptr, "boot loader unnamed module should not be null");
362 return unnamed_module;
363 }
364
365 // When creating an unnamed module, this is called without holding the Module_lock.
366 // This is okay because the unnamed module gets created before the ClassLoaderData
367 // is available to other threads.
368 ModuleEntry* ModuleEntry::new_unnamed_module_entry(Handle module_handle, ClassLoaderData* cld) {
369 ModuleEntry* entry = new ModuleEntry(module_handle, /*is_open*/true, /*name*/nullptr,
370 /*version*/ nullptr, /*location*/ nullptr,
371 cld);
372 // Unnamed modules can read all other unnamed modules.
373 assert(entry->can_read_all_unnamed(), "constructor set that");
374 return entry;
375 }
376
377 ModuleEntryTable::ModuleEntryTable() { }
378
379 ModuleEntryTable::~ModuleEntryTable() {
380 class ModuleEntryTableDeleter : public StackObj {
381 public:
382 bool do_entry(const SymbolHandle& name, ModuleEntry*& entry) {
383 if (log_is_enabled(Info, module, unload) || log_is_enabled(Debug, module)) {
384 ResourceMark rm;
385 const char* str = name->as_C_string();
386 log_info(module, unload)("unloading module %s", str);
387 log_debug(module)("ModuleEntryTable: deleting module: %s", str);
388 }
389 delete entry;
390 return true;
391 }
392 };
393
394 ModuleEntryTableDeleter deleter;
395 _table.unlink(&deleter);
396 assert(_table.number_of_entries() == 0, "should have removed all entries");
397 }
398
399 void ModuleEntry::set_loader_data(ClassLoaderData* cld) {
400 assert(!cld->has_class_mirror_holder(), "Unexpected has_class_mirror_holder cld");
401 _loader_data = cld;
402 }
403
404 void ModuleEntry::metaspace_pointers_do(MetaspaceClosure* it) {
405 it->push(&_name);
406 it->push(&_reads);
407 it->push(&_version);
408 it->push(&_location);
409 }
410
411 #if INCLUDE_CDS_JAVA_HEAP
412 bool ModuleEntry::should_be_archived() const {
413 return SystemDictionaryShared::is_builtin_loader(loader_data());
414 }
415
416 void ModuleEntry::remove_unshareable_info() {
417 _archived_module_index = HeapShared::append_root(module_oop());
418
419 if (_reads != nullptr) {
420 _reads->set_in_aot_cache();
421 }
422
423 // Clear handles and restore at run time. Handles cannot be archived.
424 if (CDSConfig::is_dumping_final_static_archive()) {
425 OopHandle null_handle;
426 _shared_pd = null_handle;
427 } else {
428 assert(shared_protection_domain() == nullptr, "never set during -Xshare:dump");
429 }
430
431 OopHandle null_handle;
432 _module_handle = null_handle;
433
434 _loader_data = nullptr; // re-init at runtime
435 if (name() != nullptr) {
436 Symbol* src_location = ArchiveBuilder::current()->get_source_addr(_location);
437 _shared_path_index = AOTClassLocationConfig::dumptime()->get_module_shared_path_index(src_location);
438 } else {
439 // _shared_path_index is used only by SystemDictionary::is_shared_class_visible_impl()
440 // for checking classes in named modules.
441 _shared_path_index = -1;
442 }
443 JFR_ONLY(set_trace_id(0);) // re-init at runtime
444 }
445
446 void ModuleEntry::load_from_archive(ClassLoaderData* loader_data) {
447 assert(CDSConfig::is_using_archive(), "runtime only");
448 set_loader_data(loader_data);
449 JFR_ONLY(INIT_ID(this);)
450 }
451
452 void ModuleEntry::preload_archived_oops() {
453 (void)HeapShared::get_root(_archived_module_index, false /* clear */);
454 }
455
456 void ModuleEntry::restore_archived_oops(ClassLoaderData* loader_data) {
457 assert(CDSConfig::is_using_archive(), "runtime only");
458 Handle module_handle(Thread::current(), HeapShared::get_root(_archived_module_index, /*clear=*/true));
459 assert(module_handle.not_null(), "huh");
460 set_module_handle(loader_data->add_handle(module_handle));
461
462 // This was cleared to zero during dump time -- we didn't save the value
463 // because it may be affected by archive relocation.
464 java_lang_Module::set_module_entry(module_handle(), this);
465
466 assert(java_lang_Module::loader(module_handle()) == loader_data->class_loader(),
467 "must be set in dump time");
468
469 if (log_is_enabled(Info, aot, module)) {
470 ResourceMark rm;
471 LogStream ls(Log(aot, module)::info());
472 ls.print("Restored from archive: ");
473 print(&ls);
474 }
475 }
476
477 void ModuleEntry::clear_archived_oops() {
478 assert(CDSConfig::is_using_archive(), "runtime only");
479 HeapShared::clear_root(_archived_module_index);
480 }
481
482 static int compare_module_by_name(ModuleEntry* a, ModuleEntry* b) {
483 assert(a == b || a->name() != b->name(), "no duplicated names");
484 return a->name()->fast_compare(b->name());
485 }
486
487 Array<ModuleEntry*>* ModuleEntryTable::build_aot_table(ClassLoaderData* loader_data, TRAPS) {
488 Array<ModuleEntry*>* aot_table =
489 MetadataFactory::new_array<ModuleEntry*>(loader_data, _table.number_of_entries(), nullptr, CHECK_NULL);
490 int n = 0;
491 auto grab = [&] (const SymbolHandle& key, ModuleEntry*& m) {
492 m->pack_reads();
493 aot_table->at_put(n++, m);
494 if (log_is_enabled(Info, aot, module)) {
495 ResourceMark rm;
496 LogStream ls(Log(aot, module)::info());
497 ls.print("Stored in archive: ");
498 m->print(&ls);
499 }
500 };
501 _table.iterate_all(grab);
502
503 if (n > 1) {
504 // Always allocate in the same order to produce deterministic archive.
505 QuickSort::sort(aot_table->data(), n, compare_module_by_name);
506 }
507
508 return aot_table;
509 }
510
511 void ModuleEntryTable::load_archived_entries(ClassLoaderData* loader_data,
512 Array<ModuleEntry*>* archived_modules) {
513 assert(CDSConfig::is_using_archive(), "runtime only");
514
515 for (int i = 0; i < archived_modules->length(); i++) {
516 ModuleEntry* archived_entry = archived_modules->at(i);
517 archived_entry->load_from_archive(loader_data);
518 _table.put(archived_entry->name(), archived_entry);
519 }
520 }
521
522 void ModuleEntryTable::restore_archived_oops(ClassLoaderData* loader_data, Array<ModuleEntry*>* archived_modules) {
523 assert(CDSConfig::is_using_archive(), "runtime only");
524 for (int i = 0; i < archived_modules->length(); i++) {
525 ModuleEntry* archived_entry = archived_modules->at(i);
526 archived_entry->restore_archived_oops(loader_data);
527 }
528 }
529 #endif // INCLUDE_CDS_JAVA_HEAP
530
531 // Create an entry in the class loader's module_entry_table. It is the
532 // caller's responsibility to ensure that the entry has not already been
533 // created.
534 ModuleEntry* ModuleEntryTable::locked_create_entry(Handle module_handle,
535 bool is_open,
536 Symbol* module_name,
537 Symbol* module_version,
538 Symbol* module_location,
539 ClassLoaderData* loader_data) {
540 assert(module_name != nullptr, "ModuleEntryTable locked_create_entry should never be called for unnamed module.");
541 assert(Module_lock->owned_by_self(), "should have the Module_lock");
542 assert(lookup_only(module_name) == nullptr, "Module already exists");
543 ModuleEntry* entry = new ModuleEntry(module_handle, is_open, module_name,
544 module_version, module_location, loader_data);
545 bool created = _table.put(module_name, entry);
546 assert(created, "should be");
547 return entry;
548 }
549
550 // lookup_only by Symbol* to find a ModuleEntry.
551 ModuleEntry* ModuleEntryTable::lookup_only(Symbol* name) {
552 assert_locked_or_safepoint(Module_lock);
553 assert(name != nullptr, "name cannot be nullptr");
554 ModuleEntry** entry = _table.get(name);
555 return (entry == nullptr) ? nullptr : *entry;
556 }
557
558 // Remove dead modules from all other alive modules' reads list.
559 // This should only occur at class unloading.
560 void ModuleEntryTable::purge_all_module_reads() {
561 assert_locked_or_safepoint(Module_lock);
562 auto purge = [&] (const SymbolHandle& key, ModuleEntry*& entry) {
563 entry->purge_reads();
564 };
565 _table.iterate_all(purge);
566 }
567
568 void ModuleEntryTable::finalize_javabase(Handle module_handle, Symbol* version, Symbol* location) {
569 assert(Module_lock->owned_by_self(), "should have the Module_lock");
570 ClassLoaderData* boot_loader_data = ClassLoaderData::the_null_class_loader_data();
571 ModuleEntryTable* module_table = boot_loader_data->modules();
572
573 assert(module_table != nullptr, "boot loader's ModuleEntryTable not defined");
574
575 if (module_handle.is_null()) {
576 fatal("Unable to finalize module definition for " JAVA_BASE_NAME);
577 }
578
579 // Set java.lang.Module, version and location for java.base
580 ModuleEntry* jb_module = javabase_moduleEntry();
581 assert(jb_module != nullptr, JAVA_BASE_NAME " ModuleEntry not defined");
582 jb_module->set_version(version);
583 jb_module->set_location(location);
584 // Once java.base's ModuleEntry _module field is set with the known
585 // java.lang.Module, java.base is considered "defined" to the VM.
586 jb_module->set_module_handle(boot_loader_data->add_handle(module_handle));
587
588 // Store pointer to the ModuleEntry for java.base in the java.lang.Module object.
589 java_lang_Module::set_module_entry(module_handle(), jb_module);
590 }
591
592 // Within java.lang.Class instances there is a java.lang.Module field that must
593 // be set with the defining module. During startup, prior to java.base's definition,
594 // classes needing their module field set are added to the fixup_module_list.
595 // Their module field is set once java.base's java.lang.Module is known to the VM.
596 void ModuleEntryTable::patch_javabase_entries(JavaThread* current, Handle module_handle) {
597 assert(!CDSConfig::is_using_aot_linked_classes(), "patching is not necessary with AOT-linked classes");
598
599 if (module_handle.is_null()) {
600 fatal("Unable to patch the module field of classes loaded prior to "
601 JAVA_BASE_NAME "'s definition, invalid java.lang.Module");
602 }
603
604 // Do the fixups for the basic primitive types
605 java_lang_Class::set_module(Universe::int_mirror(), module_handle());
606 java_lang_Class::set_module(Universe::float_mirror(), module_handle());
607 java_lang_Class::set_module(Universe::double_mirror(), module_handle());
608 java_lang_Class::set_module(Universe::byte_mirror(), module_handle());
609 java_lang_Class::set_module(Universe::bool_mirror(), module_handle());
610 java_lang_Class::set_module(Universe::char_mirror(), module_handle());
611 java_lang_Class::set_module(Universe::long_mirror(), module_handle());
612 java_lang_Class::set_module(Universe::short_mirror(), module_handle());
613 java_lang_Class::set_module(Universe::void_mirror(), module_handle());
614
615 // Do the fixups for classes that have already been created.
616 GrowableArray <Klass*>* list = java_lang_Class::fixup_module_field_list();
617 int list_length = list->length();
618 for (int i = 0; i < list_length; i++) {
619 Klass* k = list->at(i);
620 assert(k->is_klass(), "List should only hold classes");
621 #ifndef PRODUCT
622 if (HeapShared::is_a_test_class_in_unnamed_module(k)) {
623 // We allow -XX:ArchiveHeapTestClass to archive additional classes
624 // into the CDS heap, but these must be in the unnamed module.
625 ModuleEntry* unnamed_module = ClassLoaderData::the_null_class_loader_data()->unnamed_module();
626 Handle unnamed_module_handle(current, unnamed_module->module_oop());
627 java_lang_Class::fixup_module_field(k, unnamed_module_handle);
628 } else
629 #endif
630 {
631 java_lang_Class::fixup_module_field(k, module_handle);
632 }
633 k->class_loader_data()->dec_keep_alive_ref_count();
634 }
635
636 delete java_lang_Class::fixup_module_field_list();
637 java_lang_Class::set_fixup_module_field_list(nullptr);
638 }
639
640 void ModuleEntryTable::print(outputStream* st) {
641 ResourceMark rm;
642 auto printer = [&] (const SymbolHandle& name, ModuleEntry*& entry) {
643 entry->print(st);
644 };
645 st->print_cr("Module Entry Table (table_size=%d, entries=%d)",
646 _table.table_size(), _table.number_of_entries());
647 assert_locked_or_safepoint(Module_lock);
648 _table.iterate_all(printer);
649 }
650
651 void ModuleEntryTable::modules_do(void f(ModuleEntry*)) {
652 auto do_f = [&] (const SymbolHandle& key, ModuleEntry*& entry) {
653 f(entry);
654 };
655 assert_lock_strong(Module_lock);
656 _table.iterate_all(do_f);
657 }
658
659 void ModuleEntryTable::modules_do(ModuleClosure* closure) {
660 auto do_f = [&] (const SymbolHandle& key, ModuleEntry*& entry) {
661 closure->do_module(entry);
662 };
663 assert_lock_strong(Module_lock);
664 _table.iterate_all(do_f);
665 }
666
667 void ModuleEntry::print(outputStream* st) const {
668 st->print_cr("entry " PTR_FORMAT " name %s module " PTR_FORMAT " loader %s version %s location %s strict %s",
669 p2i(this),
670 name_as_C_string(),
671 p2i(module_oop()),
672 loader_data()->loader_name_and_id(),
673 version() != nullptr ? version()->as_C_string() : "nullptr",
674 location() != nullptr ? location()->as_C_string() : "nullptr",
675 BOOL_TO_STR(!can_read_all_unnamed()));
676 }
677
678 void ModuleEntryTable::verify() {
679 auto do_f = [&] (const SymbolHandle& key, ModuleEntry*& entry) {
680 entry->verify();
681 };
682 assert_locked_or_safepoint(Module_lock);
683 _table.iterate_all(do_f);
684 }
685
686 void ModuleEntry::verify() {
687 guarantee(loader_data() != nullptr, "A module entry must be associated with a loader.");
688 }