1 /*
2 * Copyright (c) 2016, 2020, 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 "classfile/classFileParser.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/javaClasses.hpp"
32 #include "classfile/javaClasses.inline.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/modules.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/stringTable.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "oops/instanceKlass.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/handles.inline.hpp"
46 #include "runtime/javaCalls.hpp"
47 #include "runtime/jniHandles.inline.hpp"
48 #include "runtime/reflection.hpp"
49 #include "utilities/stringUtils.hpp"
50 #include "utilities/utf8.hpp"
51
52 static bool verify_module_name(const char *module_name) {
53 if (module_name == NULL) return false;
54 int len = (int)strlen(module_name);
55 return (len > 0 && len <= Symbol::max_length());
56 }
57
58 bool Modules::verify_package_name(const char* package_name) {
59 if (package_name == NULL) return false;
60 int len = (int)strlen(package_name);
61 return (len > 0 && len <= Symbol::max_length() &&
62 UTF8::is_legal_utf8((const unsigned char *)package_name, len, false) &&
63 ClassFileParser::verify_unqualified_name(package_name, len,
64 ClassFileParser::LegalClass));
65 }
66
67 static char* get_module_name(oop module, TRAPS) {
68 oop name_oop = java_lang_Module::name(module);
69 if (name_oop == NULL) {
70 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(), "Null module name");
71 }
72 char* module_name = java_lang_String::as_utf8_string(name_oop);
73 if (!verify_module_name(module_name)) {
74 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
75 err_msg("Invalid module name: %s",
76 module_name != NULL ? module_name : "NULL"));
77 }
78 return module_name;
79 }
80
81 static const char* get_module_version(jstring version) {
82 if (version == NULL) {
83 return NULL;
84 }
85 return java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(version));
86 }
87
88 ModuleEntryTable* Modules::get_module_entry_table(Handle h_loader) {
89 // This code can be called during start-up, before the classLoader's classLoader data got
90 // created. So, call register_loader() to make sure the classLoader data gets created.
91 ClassLoaderData *loader_cld = SystemDictionary::register_loader(h_loader);
92 return loader_cld->modules();
93 }
94
95 static PackageEntryTable* get_package_entry_table(Handle h_loader) {
96 // This code can be called during start-up, before the classLoader's classLoader data got
97 // created. So, call register_loader() to make sure the classLoader data gets created.
98 ClassLoaderData *loader_cld = SystemDictionary::register_loader(h_loader);
99 return loader_cld->packages();
100 }
101
102 static ModuleEntry* get_module_entry(jobject module, TRAPS) {
103 oop m = JNIHandles::resolve(module);
104 if (!java_lang_Module::is_instance(m)) {
105 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
106 "module is not an instance of type java.lang.Module");
107 }
108 return java_lang_Module::module_entry(m);
109 }
110
111
112 static PackageEntry* get_locked_package_entry(ModuleEntry* module_entry, const char* package_name, TRAPS) {
113 assert(Module_lock->owned_by_self(), "should have the Module_lock");
114 assert(package_name != NULL, "Precondition");
115 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(package_name);
116 PackageEntryTable* package_entry_table = module_entry->loader_data()->packages();
117 assert(package_entry_table != NULL, "Unexpected null package entry table");
118 PackageEntry* package_entry = package_entry_table->locked_lookup_only(pkg_symbol);
119 assert(package_entry == NULL || package_entry->module() == module_entry, "Unexpectedly found a package linked to another module");
120 return package_entry;
121 }
122
123 static PackageEntry* get_package_entry_by_name(Symbol* package,
124 Handle h_loader,
125 TRAPS) {
126 if (package != NULL) {
127 ResourceMark rm(THREAD);
128 if (Modules::verify_package_name(package->as_C_string())) {
129 PackageEntryTable* const package_entry_table =
130 get_package_entry_table(h_loader);
131 assert(package_entry_table != NULL, "Unexpected null package entry table");
132 return package_entry_table->lookup_only(package);
133 }
134 }
135 return NULL;
136 }
137
138 bool Modules::is_package_defined(Symbol* package, Handle h_loader, TRAPS) {
139 PackageEntry* res = get_package_entry_by_name(package, h_loader, CHECK_false);
140 return res != NULL;
141 }
142
143 static void define_javabase_module(jobject module, jstring version,
144 jstring location, const char* const* packages,
145 jsize num_packages, TRAPS) {
146 ResourceMark rm(THREAD);
147
148 Handle module_handle(THREAD, JNIHandles::resolve(module));
149
150 // Obtain java.base's module version
151 const char* module_version = get_module_version(version);
152 TempNewSymbol version_symbol;
153 if (module_version != NULL) {
154 version_symbol = SymbolTable::new_symbol(module_version);
155 } else {
156 version_symbol = NULL;
157 }
158
159 // Obtain java.base's location
160 const char* module_location = NULL;
161 TempNewSymbol location_symbol = NULL;
162 if (location != NULL) {
163 module_location =
164 java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(location));
165 if (module_location != NULL) {
166 location_symbol = SymbolTable::new_symbol(module_location);
167 }
168 }
169
170
171 // Check that the packages are syntactically ok.
172 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
173 for (int x = 0; x < num_packages; x++) {
174 const char *package_name = packages[x];
175 if (!Modules::verify_package_name(package_name)) {
176 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
177 err_msg("Invalid package name: %s for module: " JAVA_BASE_NAME, package_name));
178 }
179 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name);
180 pkg_list->append(pkg_symbol);
181 }
182
183 // Validate java_base's loader is the boot loader.
184 oop loader = java_lang_Module::loader(module_handle());
185 if (loader != NULL) {
186 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
187 "Class loader must be the boot class loader");
188 }
189 Handle h_loader(THREAD, loader);
190
191 // Ensure the boot loader's PackageEntryTable has been created
192 PackageEntryTable* package_table = get_package_entry_table(h_loader);
193 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package_table");
194
195 // Ensure java.base's ModuleEntry has been created
196 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, "No ModuleEntry for " JAVA_BASE_NAME);
197
198 bool duplicate_javabase = false;
199 {
200 MutexLocker m1(THREAD, Module_lock);
201
202 if (ModuleEntryTable::javabase_defined()) {
203 duplicate_javabase = true;
204 } else {
205
206 // Verify that all java.base packages created during bootstrapping are in
207 // pkg_list. If any are not in pkg_list, than a non-java.base class was
208 // loaded erroneously pre java.base module definition.
209 package_table->verify_javabase_packages(pkg_list);
210
211 // loop through and add any new packages for java.base
212 for (int x = 0; x < pkg_list->length(); x++) {
213 // Some of java.base's packages were added early in bootstrapping, ignore duplicates.
214 package_table->locked_create_entry_if_not_exist(pkg_list->at(x),
215 ModuleEntryTable::javabase_moduleEntry());
216 assert(package_table->locked_lookup_only(pkg_list->at(x)) != NULL,
217 "Unable to create a " JAVA_BASE_NAME " package entry");
218 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
219 // the Symbol* that was created above for each package. The refcount was incremented
220 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
221 pkg_list->at(x)->decrement_refcount();
222 }
223
224 // Finish defining java.base's ModuleEntry
225 ModuleEntryTable::finalize_javabase(module_handle, version_symbol, location_symbol);
226 }
227 }
228 if (duplicate_javabase) {
229 THROW_MSG(vmSymbols::java_lang_InternalError(),
230 "Module " JAVA_BASE_NAME " is already defined");
231 }
232
233 // Only the thread that actually defined the base module will get here,
234 // so no locking is needed.
235
236 // Patch any previously loaded class's module field with java.base's java.lang.Module.
237 ModuleEntryTable::patch_javabase_entries(module_handle);
238
239 log_info(module, load)(JAVA_BASE_NAME " location: %s",
240 module_location != NULL ? module_location : "NULL");
241 log_debug(module)("define_javabase_module(): Definition of module: "
242 JAVA_BASE_NAME ", version: %s, location: %s, package #: %d",
243 module_version != NULL ? module_version : "NULL",
244 module_location != NULL ? module_location : "NULL",
245 pkg_list->length());
246
247 // packages defined to java.base
248 if (log_is_enabled(Trace, module)) {
249 for (int x = 0; x < pkg_list->length(); x++) {
250 log_trace(module)("define_javabase_module(): creation of package %s for module " JAVA_BASE_NAME,
251 (pkg_list->at(x))->as_C_string());
252 }
253 }
254 }
255
256 // Caller needs ResourceMark.
257 void throw_dup_pkg_exception(const char* module_name, PackageEntry* package, TRAPS) {
258 const char* package_name = package->name()->as_C_string();
259 if (package->module()->is_named()) {
260 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
261 err_msg("Package %s for module %s is already in another module, %s, defined to the class loader",
262 package_name, module_name, package->module()->name()->as_C_string()));
263 } else {
264 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
265 err_msg("Package %s for module %s is already in the unnamed module defined to the class loader",
266 package_name, module_name));
267 }
268 }
269
270 void Modules::define_module(jobject module, jboolean is_open, jstring version,
271 jstring location, const char* const* packages,
272 jsize num_packages, TRAPS) {
273 ResourceMark rm(THREAD);
274
275 if (module == NULL) {
276 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
277 }
278
279 if (num_packages < 0) {
280 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
281 "num_packages must be >= 0");
282 }
283
284 if (packages == NULL && num_packages > 0) {
285 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
286 "num_packages should be zero if packages is null");
287 }
288
289 Handle module_handle(THREAD, JNIHandles::resolve(module));
290 if (!java_lang_Module::is_instance(module_handle())) {
291 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
292 "module is not an instance of type java.lang.Module");
293 }
294
295 char* module_name = get_module_name(module_handle(), CHECK);
296 if (module_name == NULL) {
297 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
298 "Module name cannot be null");
299 }
300
301 // Special handling of java.base definition
302 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
303 assert(is_open == JNI_FALSE, "java.base module cannot be open");
304 define_javabase_module(module, version, location, packages, num_packages, CHECK);
305 return;
306 }
307
308 const char* module_version = get_module_version(version);
309
310 oop loader = java_lang_Module::loader(module_handle());
311 // Make sure loader is not the jdk.internal.reflect.DelegatingClassLoader.
312 if (loader != java_lang_ClassLoader::non_reflection_class_loader(loader)) {
313 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
314 "Class loader is an invalid delegating class loader");
315 }
316 Handle h_loader = Handle(THREAD, loader);
317 // define_module can be called during start-up, before the class loader's ClassLoaderData
318 // has been created. SystemDictionary::register_loader ensures creation, if needed.
319 ClassLoaderData* loader_data = SystemDictionary::register_loader(h_loader);
320 assert(loader_data != NULL, "class loader data shouldn't be null");
321
322 // Check that the list of packages has no duplicates and that the
323 // packages are syntactically ok.
324 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
325 for (int x = 0; x < num_packages; x++) {
326 const char* package_name = packages[x];
327 if (!verify_package_name(package_name)) {
328 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
329 err_msg("Invalid package name: %s for module: %s",
330 package_name, module_name));
331 }
332
333 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
334 if (!h_loader.is_null() &&
335 !SystemDictionary::is_platform_class_loader(h_loader()) &&
336 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&
337 (package_name[JAVAPKG_LEN] == JVM_SIGNATURE_SLASH || package_name[JAVAPKG_LEN] == '\0'))) {
338 const char* class_loader_name = loader_data->loader_name_and_id();
339 size_t pkg_len = strlen(package_name);
340 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len + 1);
341 strncpy(pkg_name, package_name, pkg_len + 1);
342 StringUtils::replace_no_expand(pkg_name, "/", ".");
343 const char* msg_text1 = "Class loader (instance of): ";
344 const char* msg_text2 = " tried to define prohibited package name: ";
345 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;
346 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
347 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);
348 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);
349 }
350
351 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name);
352 pkg_list->append(pkg_symbol);
353 }
354
355 ModuleEntryTable* module_table = get_module_entry_table(h_loader);
356 assert(module_table != NULL, "module entry table shouldn't be null");
357
358 // Create symbol* entry for module name.
359 TempNewSymbol module_symbol = SymbolTable::new_symbol(module_name);
360
361 bool dupl_modules = false;
362
363 // Create symbol* entry for module version.
364 TempNewSymbol version_symbol;
365 if (module_version != NULL) {
366 version_symbol = SymbolTable::new_symbol(module_version);
367 } else {
368 version_symbol = NULL;
369 }
370
371 // Create symbol* entry for module location.
372 const char* module_location = NULL;
373 TempNewSymbol location_symbol = NULL;
374 if (location != NULL) {
375 module_location =
376 java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(location));
377 if (module_location != NULL) {
378 location_symbol = SymbolTable::new_symbol(module_location);
379 }
380 }
381
382 PackageEntryTable* package_table = NULL;
383 PackageEntry* existing_pkg = NULL;
384 {
385 MutexLocker ml(THREAD, Module_lock);
386
387 if (num_packages > 0) {
388 package_table = get_package_entry_table(h_loader);
389 assert(package_table != NULL, "Missing package_table");
390
391 // Check that none of the packages exist in the class loader's package table.
392 for (int x = 0; x < pkg_list->length(); x++) {
393 existing_pkg = package_table->locked_lookup_only(pkg_list->at(x));
394 if (existing_pkg != NULL) {
395 // This could be because the module was already defined. If so,
396 // report that error instead of the package error.
397 if (module_table->lookup_only(module_symbol) != NULL) {
398 dupl_modules = true;
399 }
400 break;
401 }
402 }
403 } // if (num_packages > 0)...
404
405 // Add the module and its packages.
406 if (!dupl_modules && existing_pkg == NULL) {
407 if (module_table->lookup_only(module_symbol) == NULL) {
408 // Create the entry for this module in the class loader's module entry table.
409 ModuleEntry* module_entry = module_table->locked_create_entry(module_handle,
410 (is_open == JNI_TRUE), module_symbol,
411 version_symbol, location_symbol, loader_data);
412 assert(module_entry != NULL, "module_entry creation failed");
413
414 // Add the packages.
415 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package table");
416 for (int y = 0; y < pkg_list->length(); y++) {
417 package_table->locked_create_entry(pkg_list->at(y), module_entry);
418
419 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
420 // the Symbol* that was created above for each package. The refcount was incremented
421 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
422 pkg_list->at(y)->decrement_refcount();
423 }
424
425 // Store pointer to ModuleEntry record in java.lang.Module object.
426 java_lang_Module::set_module_entry(module_handle(), module_entry);
427 } else {
428 dupl_modules = true;
429 }
430 }
431 } // Release the lock
432
433 // any errors ?
434 if (dupl_modules) {
435 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
436 err_msg("Module %s is already defined", module_name));
437 } else if (existing_pkg != NULL) {
438 throw_dup_pkg_exception(module_name, existing_pkg, CHECK);
439 }
440
441 log_info(module, load)("%s location: %s", module_name,
442 module_location != NULL ? module_location : "NULL");
443 LogTarget(Debug, module) lt;
444 if (lt.is_enabled()) {
445 LogStream ls(lt);
446 ls.print("define_module(): creation of module: %s, version: %s, location: %s, ",
447 module_name, module_version != NULL ? module_version : "NULL",
448 module_location != NULL ? module_location : "NULL");
449 loader_data->print_value_on(&ls);
450 ls.print_cr(", package #: %d", pkg_list->length());
451 for (int y = 0; y < pkg_list->length(); y++) {
452 log_trace(module)("define_module(): creation of package %s for module %s",
453 (pkg_list->at(y))->as_C_string(), module_name);
454 }
455 }
456
457 // If the module is defined to the boot loader and an exploded build is being
458 // used, prepend <java.home>/modules/modules_name to the system boot class path.
459 if (h_loader.is_null() && !ClassLoader::has_jrt_entry()) {
460 ClassLoader::add_to_exploded_build_list(module_symbol, CHECK);
461 }
462 }
463
464 void Modules::set_bootloader_unnamed_module(jobject module, TRAPS) {
465 ResourceMark rm(THREAD);
466
467 if (module == NULL) {
468 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
469 }
470 Handle module_handle(THREAD, JNIHandles::resolve(module));
471 if (!java_lang_Module::is_instance(module_handle())) {
472 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
473 "module is not an instance of type java.lang.Module");
474 }
475
476 // Ensure that this is an unnamed module
477 oop name = java_lang_Module::name(module_handle());
478 if (name != NULL) {
479 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
480 "boot loader's unnamed module's java.lang.Module has a name");
481 }
482
483 // Validate java_base's loader is the boot loader.
484 oop loader = java_lang_Module::loader(module_handle());
485 if (loader != NULL) {
486 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
487 "Class loader must be the boot class loader");
488 }
489 Handle h_loader(THREAD, loader);
490
491 log_debug(module)("set_bootloader_unnamed_module(): recording unnamed module for boot loader");
492
493 // Set java.lang.Module for the boot loader's unnamed module
494 ClassLoaderData* boot_loader_data = ClassLoaderData::the_null_class_loader_data();
495 ModuleEntry* unnamed_module = boot_loader_data->unnamed_module();
496 assert(unnamed_module != NULL, "boot loader's unnamed ModuleEntry not defined");
497 unnamed_module->set_module(boot_loader_data->add_handle(module_handle));
498 // Store pointer to the ModuleEntry in the unnamed module's java.lang.Module object.
499 java_lang_Module::set_module_entry(module_handle(), unnamed_module);
500 }
501
502 void Modules::add_module_exports(jobject from_module, const char* package_name, jobject to_module, TRAPS) {
503 if (package_name == NULL) {
504 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
505 "package is null");
506 }
507 if (from_module == NULL) {
508 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
509 "from_module is null");
510 }
511 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
512 if (from_module_entry == NULL) {
513 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
514 "from_module cannot be found");
515 }
516
517 // All packages in unnamed and open modules are exported by default.
518 if (!from_module_entry->is_named() || from_module_entry->is_open()) return;
519
520 ModuleEntry* to_module_entry;
521 if (to_module == NULL) {
522 to_module_entry = NULL; // It's an unqualified export.
523 } else {
524 to_module_entry = get_module_entry(to_module, CHECK);
525 if (to_module_entry == NULL) {
526 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
527 "to_module is invalid");
528 }
529 }
530
531 PackageEntry* package_entry = NULL;
532 {
533 MutexLocker ml(THREAD, Module_lock);
534 package_entry = get_locked_package_entry(from_module_entry, package_name, CHECK);
535 // Do nothing if modules are the same
536 // If the package is not found we'll throw an exception later
537 if (from_module_entry != to_module_entry &&
538 package_entry != NULL) {
539 package_entry->set_exported(to_module_entry);
540 }
541 }
542
543 // Handle errors and logging outside locked section
544 if (package_entry == NULL) {
545 ResourceMark rm(THREAD);
546 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
547 err_msg("Package %s not found in from_module %s",
548 package_name != NULL ? package_name : "",
549 from_module_entry->name()->as_C_string()));
550 }
551
552 if (log_is_enabled(Debug, module)) {
553 ResourceMark rm(THREAD);
554 log_debug(module)("add_module_exports(): package %s in module %s is exported to module %s",
555 package_entry->name()->as_C_string(),
556 from_module_entry->name()->as_C_string(),
557 to_module_entry == NULL ? "NULL" :
558 to_module_entry->is_named() ?
559 to_module_entry->name()->as_C_string() : UNNAMED_MODULE);
560 }
561 }
562
563
564 void Modules::add_module_exports_qualified(jobject from_module, const char* package,
565 jobject to_module, TRAPS) {
566 if (to_module == NULL) {
567 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
568 "to_module is null");
569 }
570 add_module_exports(from_module, package, to_module, CHECK);
571 }
572
573 void Modules::add_reads_module(jobject from_module, jobject to_module, TRAPS) {
574 if (from_module == NULL) {
575 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
576 "from_module is null");
577 }
578
579 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
580 if (from_module_entry == NULL) {
581 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
582 "from_module is not valid");
583 }
584
585 ModuleEntry* to_module_entry;
586 if (to_module != NULL) {
587 to_module_entry = get_module_entry(to_module, CHECK);
588 if (to_module_entry == NULL) {
589 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
590 "to_module is invalid");
591 }
592 } else {
593 to_module_entry = NULL;
594 }
595
596 ResourceMark rm(THREAD);
597 log_debug(module)("add_reads_module(): Adding read from module %s to module %s",
598 from_module_entry->is_named() ?
599 from_module_entry->name()->as_C_string() : UNNAMED_MODULE,
600 to_module_entry == NULL ? "all unnamed" :
601 (to_module_entry->is_named() ?
602 to_module_entry->name()->as_C_string() : UNNAMED_MODULE));
603
604 // if modules are the same or if from_module is unnamed then no need to add the read.
605 if (from_module_entry != to_module_entry && from_module_entry->is_named()) {
606 from_module_entry->add_read(to_module_entry);
607 }
608 }
609
610 // This method is called by JFR and JNI.
611 jobject Modules::get_module(jclass clazz, TRAPS) {
612 assert(ModuleEntryTable::javabase_defined(),
613 "Attempt to call get_module before " JAVA_BASE_NAME " is defined");
614
615 if (clazz == NULL) {
616 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
617 "class is null", JNI_FALSE);
618 }
619 oop mirror = JNIHandles::resolve_non_null(clazz);
620 if (mirror == NULL) {
621 log_debug(module)("get_module(): no mirror, returning NULL");
622 return NULL;
623 }
624 if (!java_lang_Class::is_instance(mirror)) {
625 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
626 "Invalid class", JNI_FALSE);
627 }
628
629 oop module = java_lang_Class::module(mirror);
630
631 assert(module != NULL, "java.lang.Class module field not set");
632 assert(java_lang_Module::is_instance(module), "module is not an instance of type java.lang.Module");
633
634 LogTarget(Debug,module) lt;
635 if (lt.is_enabled()) {
636 ResourceMark rm(THREAD);
637 LogStream ls(lt);
638 Klass* klass = java_lang_Class::as_Klass(mirror);
639 oop module_name = java_lang_Module::name(module);
640 if (module_name != NULL) {
641 ls.print("get_module(): module ");
642 java_lang_String::print(module_name, tty);
643 } else {
644 ls.print("get_module(): Unamed Module");
645 }
646 if (klass != NULL) {
647 ls.print_cr(" for class %s", klass->external_name());
648 } else {
649 ls.print_cr(" for primitive class");
650 }
651 }
652
653 return JNIHandles::make_local(THREAD, module);
654 }
655
656 jobject Modules::get_named_module(Handle h_loader, const char* package_name, TRAPS) {
657 assert(ModuleEntryTable::javabase_defined(),
658 "Attempt to call get_named_module before " JAVA_BASE_NAME " is defined");
659 assert(h_loader.is_null() || java_lang_ClassLoader::is_subclass(h_loader->klass()),
660 "Class loader is not a subclass of java.lang.ClassLoader");
661 assert(package_name != NULL, "the package_name should not be NULL");
662
663 if (strlen(package_name) == 0) {
664 return NULL;
665 }
666 TempNewSymbol package_sym = SymbolTable::new_symbol(package_name);
667 const PackageEntry* const pkg_entry =
668 get_package_entry_by_name(package_sym, h_loader, THREAD);
669 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
670
671 if (module_entry != NULL && module_entry->module() != NULL && module_entry->is_named()) {
672 return JNIHandles::make_local(THREAD, module_entry->module());
673 }
674 return NULL;
675 }
676
677 // Export package in module to all unnamed modules.
678 void Modules::add_module_exports_to_all_unnamed(jobject module, const char* package_name, TRAPS) {
679 if (module == NULL) {
680 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
681 "module is null");
682 }
683 if (package_name == NULL) {
684 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
685 "package is null");
686 }
687 ModuleEntry* module_entry = get_module_entry(module, CHECK);
688 if (module_entry == NULL) {
689 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
690 "module is invalid");
691 }
692
693 // No-op for unnamed module and open modules
694 if (!module_entry->is_named() || module_entry->is_open())
695 return;
696
697 PackageEntry* package_entry = NULL;
698 {
699 MutexLocker m1(THREAD, Module_lock);
700 package_entry = get_locked_package_entry(module_entry, package_name, CHECK);
701
702 // Mark package as exported to all unnamed modules.
703 if (package_entry != NULL) {
704 package_entry->set_is_exported_allUnnamed();
705 }
706 }
707
708 // Handle errors and logging outside locked section
709 if (package_entry == NULL) {
710 ResourceMark rm(THREAD);
711 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
712 err_msg("Package %s not found in module %s",
713 package_name != NULL ? package_name : "",
714 module_entry->name()->as_C_string()));
715 }
716
717 if (log_is_enabled(Debug, module)) {
718 ResourceMark rm(THREAD);
719 log_debug(module)("add_module_exports_to_all_unnamed(): package %s in module"
720 " %s is exported to all unnamed modules",
721 package_entry->name()->as_C_string(),
722 module_entry->name()->as_C_string());
723 }
724 }