1 /*
2 * Copyright (c) 2016, 2017, 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 "classfile/classFileParser.hpp"
27 #include "classfile/classLoader.hpp"
28 #include "classfile/classLoaderData.inline.hpp"
29 #include "classfile/javaAssertions.hpp"
30 #include "classfile/javaClasses.hpp"
31 #include "classfile/javaClasses.inline.hpp"
32 #include "classfile/moduleEntry.hpp"
33 #include "classfile/modules.hpp"
34 #include "classfile/packageEntry.hpp"
35 #include "classfile/stringTable.hpp"
36 #include "classfile/symbolTable.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "logging/log.hpp"
40 #include "memory/resourceArea.hpp"
41 #include "oops/instanceKlass.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/handles.inline.hpp"
44 #include "runtime/javaCalls.hpp"
45 #include "runtime/reflection.hpp"
46 #include "utilities/stringUtils.hpp"
47 #include "utilities/utf8.hpp"
48
49 static bool verify_module_name(const char *module_name) {
50 if (module_name == NULL) return false;
51 int len = (int)strlen(module_name);
52 return (len > 0 && len <= Symbol::max_length());
53 }
54
55 bool Modules::verify_package_name(const char* package_name) {
56 if (package_name == NULL) return false;
57 int len = (int)strlen(package_name);
58 return (len > 0 && len <= Symbol::max_length() &&
59 UTF8::is_legal_utf8((const unsigned char *)package_name, len, false) &&
60 ClassFileParser::verify_unqualified_name(package_name, len,
61 ClassFileParser::LegalClass));
62 }
63
64 static char* get_module_name(oop module, TRAPS) {
65 oop name_oop = java_lang_Module::name(module);
66 if (name_oop == NULL) {
67 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(), "Null module name");
68 }
69 char* module_name = java_lang_String::as_utf8_string(name_oop);
70 if (!verify_module_name(module_name)) {
71 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
72 err_msg("Invalid module name: %s",
73 module_name != NULL ? module_name : "NULL"));
74 }
75 return module_name;
76 }
77
78 static const char* get_module_version(jstring version) {
79 if (version == NULL) {
80 return NULL;
81 }
82 return java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(version));
83 }
84
85 static ModuleEntryTable* get_module_entry_table(Handle h_loader, TRAPS) {
86 // This code can be called during start-up, before the classLoader's classLoader data got
87 // created. So, call register_loader() to make sure the classLoader data gets created.
88 ClassLoaderData *loader_cld = SystemDictionary::register_loader(h_loader, CHECK_NULL);
89 return loader_cld->modules();
90 }
91
92 static PackageEntryTable* get_package_entry_table(Handle h_loader, TRAPS) {
93 // This code can be called during start-up, before the classLoader's classLoader data got
94 // created. So, call register_loader() to make sure the classLoader data gets created.
95 ClassLoaderData *loader_cld = SystemDictionary::register_loader(h_loader, CHECK_NULL);
96 return loader_cld->packages();
97 }
98
99 static ModuleEntry* get_module_entry(jobject module, TRAPS) {
100 Handle module_h(THREAD, JNIHandles::resolve(module));
101 if (!java_lang_Module::is_instance(module_h())) {
102 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
103 "module is not an instance of type java.lang.Module");
104 }
105 return java_lang_Module::module_entry(module_h(), CHECK_NULL);
106 }
107
108 static PackageEntry* get_package_entry(ModuleEntry* module_entry, const char* package_name, TRAPS) {
109 ResourceMark rm(THREAD);
110 if (package_name == NULL) return NULL;
111 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(package_name, CHECK_NULL);
112 PackageEntryTable* package_entry_table = module_entry->loader_data()->packages();
113 assert(package_entry_table != NULL, "Unexpected null package entry table");
114 return package_entry_table->lookup_only(pkg_symbol);
115 }
116
117 static PackageEntry* get_package_entry_by_name(Symbol* package,
118 Handle h_loader,
119 TRAPS) {
120 if (package != NULL) {
121 ResourceMark rm(THREAD);
122 if (Modules::verify_package_name(package->as_C_string())) {
123 PackageEntryTable* const package_entry_table =
124 get_package_entry_table(h_loader, CHECK_NULL);
125 assert(package_entry_table != NULL, "Unexpected null package entry table");
126 return package_entry_table->lookup_only(package);
127 }
128 }
129 return NULL;
130 }
131
132 bool Modules::is_package_defined(Symbol* package, Handle h_loader, TRAPS) {
133 PackageEntry* res = get_package_entry_by_name(package, h_loader, CHECK_false);
134 return res != NULL;
135 }
136
137 static void define_javabase_module(jobject module, jstring version,
138 jstring location, const char* const* packages,
139 jsize num_packages, TRAPS) {
140 ResourceMark rm(THREAD);
141
142 Handle module_handle(THREAD, JNIHandles::resolve(module));
143
144 // Obtain java.base's module version
145 const char* module_version = get_module_version(version);
146 TempNewSymbol version_symbol;
147 if (module_version != NULL) {
148 version_symbol = SymbolTable::new_symbol(module_version, CHECK);
149 } else {
150 version_symbol = NULL;
151 }
152
153 // Obtain java.base's location
154 const char* module_location = NULL;
155 TempNewSymbol location_symbol = NULL;
156 if (location != NULL) {
157 module_location =
158 java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(location));
159 if (module_location != NULL) {
160 location_symbol = SymbolTable::new_symbol(module_location, CHECK);
161 }
162 }
163
164
165 // Check that the packages are syntactically ok.
166 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
167 for (int x = 0; x < num_packages; x++) {
168 const char *package_name = packages[x];
169 if (!Modules::verify_package_name(package_name)) {
170 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
171 err_msg("Invalid package name: %s for module: " JAVA_BASE_NAME, package_name));
172 }
173 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);
174 pkg_list->append(pkg_symbol);
175 }
176
177 // Validate java_base's loader is the boot loader.
178 oop loader = java_lang_Module::loader(module_handle());
179 if (loader != NULL) {
180 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
181 "Class loader must be the boot class loader");
182 }
183 Handle h_loader(THREAD, loader);
184
185 // Ensure the boot loader's PackageEntryTable has been created
186 PackageEntryTable* package_table = get_package_entry_table(h_loader, CHECK);
187 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package_table");
188
189 // Ensure java.base's ModuleEntry has been created
190 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, "No ModuleEntry for " JAVA_BASE_NAME);
191
192 bool duplicate_javabase = false;
193 {
194 MutexLocker m1(Module_lock, THREAD);
195
196 if (ModuleEntryTable::javabase_defined()) {
197 duplicate_javabase = true;
198 } else {
199
200 // Verify that all java.base packages created during bootstrapping are in
201 // pkg_list. If any are not in pkg_list, than a non-java.base class was
202 // loaded erroneously pre java.base module definition.
203 package_table->verify_javabase_packages(pkg_list);
204
205 // loop through and add any new packages for java.base
206 PackageEntry* pkg;
207 for (int x = 0; x < pkg_list->length(); x++) {
208 // Some of java.base's packages were added early in bootstrapping, ignore duplicates.
209 if (package_table->lookup_only(pkg_list->at(x)) == NULL) {
210 pkg = package_table->locked_create_entry_or_null(pkg_list->at(x), ModuleEntryTable::javabase_moduleEntry());
211 assert(pkg != NULL, "Unable to create a " JAVA_BASE_NAME " package entry");
212 }
213 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
214 // the Symbol* that was created above for each package. The refcount was incremented
215 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
216 pkg_list->at(x)->decrement_refcount();
217 }
218
219 // Finish defining java.base's ModuleEntry
220 ModuleEntryTable::finalize_javabase(module_handle, version_symbol, location_symbol);
221 }
222 }
223 if (duplicate_javabase) {
224 THROW_MSG(vmSymbols::java_lang_InternalError(),
225 "Module " JAVA_BASE_NAME " is already defined");
226 }
227
228 // Only the thread that actually defined the base module will get here,
229 // so no locking is needed.
230
231 // Patch any previously loaded class's module field with java.base's java.lang.Module.
232 ModuleEntryTable::patch_javabase_entries(module_handle);
233
234 log_debug(modules)("define_javabase_module(): Definition of module: "
235 JAVA_BASE_NAME ", version: %s, location: %s, package #: %d",
236 module_version != NULL ? module_version : "NULL",
237 module_location != NULL ? module_location : "NULL",
238 pkg_list->length());
239
240 // packages defined to java.base
241 if (log_is_enabled(Trace, modules)) {
242 for (int x = 0; x < pkg_list->length(); x++) {
243 log_trace(modules)("define_javabase_module(): creation of package %s for module " JAVA_BASE_NAME,
244 (pkg_list->at(x))->as_C_string());
245 }
246 }
247 }
248
249 // Caller needs ResourceMark.
250 void throw_dup_pkg_exception(const char* module_name, PackageEntry* package, TRAPS) {
251 const char* package_name = package->name()->as_C_string();
252 if (package->module()->is_named()) {
253 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
254 err_msg("Package %s for module %s is already in another module, %s, defined to the class loader",
255 package_name, module_name, package->module()->name()->as_C_string()));
256 } else {
257 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
258 err_msg("Package %s for module %s is already in the unnamed module defined to the class loader",
259 package_name, module_name));
260 }
261 }
262
263 void Modules::define_module(jobject module, jboolean is_open, jstring version,
264 jstring location, const char* const* packages,
265 jsize num_packages, TRAPS) {
266 ResourceMark rm(THREAD);
267
268 if (module == NULL) {
269 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
270 }
271
272 if (num_packages < 0) {
273 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
274 "num_packages must be >= 0");
275 }
276
277 if (packages == NULL && num_packages > 0) {
278 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
279 "num_packages should be zero if packages is null");
280 }
281
282 Handle module_handle(THREAD, JNIHandles::resolve(module));
283 if (!java_lang_Module::is_instance(module_handle())) {
284 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
285 "module is not an instance of type java.lang.Module");
286 }
287
288 char* module_name = get_module_name(module_handle(), CHECK);
289 if (module_name == NULL) {
290 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
291 "Module name cannot be null");
292 }
293
294 // Special handling of java.base definition
295 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
296 assert(is_open == JNI_FALSE, "java.base module cannot be open");
297 define_javabase_module(module, version, location, packages, num_packages, CHECK);
298 return;
299 }
300
301 const char* module_version = get_module_version(version);
302
303 oop loader = java_lang_Module::loader(module_handle());
304 // Make sure loader is not the jdk.internal.reflect.DelegatingClassLoader.
305 if (loader != java_lang_ClassLoader::non_reflection_class_loader(loader)) {
306 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
307 "Class loader is an invalid delegating class loader");
308 }
309 Handle h_loader = Handle(THREAD, loader);
310
311 // Check that the list of packages has no duplicates and that the
312 // packages are syntactically ok.
313 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
314 for (int x = 0; x < num_packages; x++) {
315 const char* package_name = packages[x];
316 if (!verify_package_name(package_name)) {
317 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
318 err_msg("Invalid package name: %s for module: %s",
319 package_name, module_name));
320 }
321
322 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
323 if (!h_loader.is_null() &&
324 !SystemDictionary::is_platform_class_loader(h_loader()) &&
325 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&
326 (package_name[JAVAPKG_LEN] == '/' || package_name[JAVAPKG_LEN] == '\0'))) {
327 const char* class_loader_name = SystemDictionary::loader_name(h_loader());
328 size_t pkg_len = strlen(package_name);
329 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len);
330 strncpy(pkg_name, package_name, pkg_len);
331 StringUtils::replace_no_expand(pkg_name, "/", ".");
332 const char* msg_text1 = "Class loader (instance of): ";
333 const char* msg_text2 = " tried to define prohibited package name: ";
334 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;
335 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
336 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);
337 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);
338 }
339
340 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);
341 pkg_list->append(pkg_symbol);
342 }
343
344 ModuleEntryTable* module_table = get_module_entry_table(h_loader, CHECK);
345 assert(module_table != NULL, "module entry table shouldn't be null");
346
347 // Create symbol* entry for module name.
348 TempNewSymbol module_symbol = SymbolTable::new_symbol(module_name, CHECK);
349
350 bool dupl_modules = false;
351
352 // Create symbol* entry for module version.
353 TempNewSymbol version_symbol;
354 if (module_version != NULL) {
355 version_symbol = SymbolTable::new_symbol(module_version, CHECK);
356 } else {
357 version_symbol = NULL;
358 }
359
360 // Create symbol* entry for module location.
361 const char* module_location = NULL;
362 TempNewSymbol location_symbol = NULL;
363 if (location != NULL) {
364 module_location =
365 java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(location));
366 if (module_location != NULL) {
367 location_symbol = SymbolTable::new_symbol(module_location, CHECK);
368 }
369 }
370
371 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data_or_null(h_loader());
372 assert(loader_data != NULL, "class loader data shouldn't be null");
373
374 PackageEntryTable* package_table = NULL;
375 PackageEntry* existing_pkg = NULL;
376 {
377 MutexLocker ml(Module_lock, THREAD);
378
379 if (num_packages > 0) {
380 package_table = get_package_entry_table(h_loader, CHECK);
381 assert(package_table != NULL, "Missing package_table");
382
383 // Check that none of the packages exist in the class loader's package table.
384 for (int x = 0; x < pkg_list->length(); x++) {
385 existing_pkg = package_table->lookup_only(pkg_list->at(x));
386 if (existing_pkg != NULL) {
387 // This could be because the module was already defined. If so,
388 // report that error instead of the package error.
389 if (module_table->lookup_only(module_symbol) != NULL) {
390 dupl_modules = true;
391 }
392 break;
393 }
394 }
395 } // if (num_packages > 0)...
396
397 // Add the module and its packages.
398 if (!dupl_modules && existing_pkg == NULL) {
399 // Create the entry for this module in the class loader's module entry table.
400 ModuleEntry* module_entry = module_table->locked_create_entry_or_null(module_handle,
401 (is_open == JNI_TRUE), module_symbol,
402 version_symbol, location_symbol, loader_data);
403
404 if (module_entry == NULL) {
405 dupl_modules = true;
406 } else {
407 // Add the packages.
408 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package table");
409 PackageEntry* pkg;
410 for (int y = 0; y < pkg_list->length(); y++) {
411 pkg = package_table->locked_create_entry_or_null(pkg_list->at(y), module_entry);
412 assert(pkg != NULL, "Unable to create a module's package entry");
413
414 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
415 // the Symbol* that was created above for each package. The refcount was incremented
416 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
417 pkg_list->at(y)->decrement_refcount();
418 }
419
420 // Store pointer to ModuleEntry record in java.lang.Module object.
421 java_lang_Module::set_module_entry(module_handle(), module_entry);
422 }
423 }
424 } // Release the lock
425
426 // any errors ?
427 if (dupl_modules) {
428 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
429 err_msg("Module %s is already defined", module_name));
430 } else if (existing_pkg != NULL) {
431 throw_dup_pkg_exception(module_name, existing_pkg, CHECK);
432 }
433
434 if (log_is_enabled(Debug, modules)) {
435 outputStream* logst = Log(modules)::debug_stream();
436 logst->print("define_module(): creation of module: %s, version: %s, location: %s, ",
437 module_name, module_version != NULL ? module_version : "NULL",
438 module_location != NULL ? module_location : "NULL");
439 loader_data->print_value_on(logst);
440 logst->print_cr(", package #: %d", pkg_list->length());
441 for (int y = 0; y < pkg_list->length(); y++) {
442 log_trace(modules)("define_module(): creation of package %s for module %s",
443 (pkg_list->at(y))->as_C_string(), module_name);
444 }
445 }
446
447 // If the module is defined to the boot loader and an exploded build is being
448 // used, prepend <java.home>/modules/modules_name, if it exists, to the system boot class path.
449 if (loader == NULL &&
450 !Universe::is_module_initialized() &&
451 !ClassLoader::has_jrt_entry()) {
452 ClassLoader::add_to_exploded_build_list(module_symbol, CHECK);
453 }
454 }
455
456 void Modules::set_bootloader_unnamed_module(jobject module, TRAPS) {
457 ResourceMark rm(THREAD);
458
459 if (module == NULL) {
460 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
461 }
462 Handle module_handle(THREAD, JNIHandles::resolve(module));
463 if (!java_lang_Module::is_instance(module_handle())) {
464 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
465 "module is not an instance of type java.lang.Module");
466 }
467
468 // Ensure that this is an unnamed module
469 oop name = java_lang_Module::name(module_handle());
470 if (name != NULL) {
471 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
472 "boot loader's unnamed module's java.lang.Module has a name");
473 }
474
475 // Validate java_base's loader is the boot loader.
476 oop loader = java_lang_Module::loader(module_handle());
477 if (loader != NULL) {
478 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
479 "Class loader must be the boot class loader");
480 }
481 Handle h_loader(THREAD, loader);
482
483 log_debug(modules)("set_bootloader_unnamed_module(): recording unnamed module for boot loader");
484
485 // Set java.lang.Module for the boot loader's unnamed module
486 ClassLoaderData* boot_loader_data = ClassLoaderData::the_null_class_loader_data();
487 ModuleEntry* unnamed_module = boot_loader_data->unnamed_module();
488 assert(unnamed_module != NULL, "boot loader's unnamed ModuleEntry not defined");
489 unnamed_module->set_module(boot_loader_data->add_handle(module_handle));
490 // Store pointer to the ModuleEntry in the unnamed module's java.lang.Module object.
491 java_lang_Module::set_module_entry(module_handle(), unnamed_module);
492 }
493
494 void Modules::add_module_exports(jobject from_module, const char* package_name, jobject to_module, TRAPS) {
495 if (package_name == NULL) {
496 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
497 "package is null");
498 }
499 if (from_module == NULL) {
500 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
501 "from_module is null");
502 }
503 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
504 if (from_module_entry == NULL) {
505 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
506 "from_module cannot be found");
507 }
508
509 // All packages in unnamed and open modules are exported by default.
510 if (!from_module_entry->is_named() || from_module_entry->is_open()) return;
511
512 ModuleEntry* to_module_entry;
513 if (to_module == NULL) {
514 to_module_entry = NULL; // It's an unqualified export.
515 } else {
516 to_module_entry = get_module_entry(to_module, CHECK);
517 if (to_module_entry == NULL) {
518 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
519 "to_module is invalid");
520 }
521 }
522
523 PackageEntry *package_entry = get_package_entry(from_module_entry, package_name, CHECK);
524 ResourceMark rm(THREAD);
525 if (package_entry == NULL) {
526 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
527 err_msg("Package %s not found in from_module %s",
528 package_name != NULL ? package_name : "",
529 from_module_entry->name()->as_C_string()));
530 }
531 if (package_entry->module() != from_module_entry) {
532 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
533 err_msg("Package: %s found in module %s, not in from_module: %s",
534 package_entry->name()->as_C_string(),
535 package_entry->module()->name()->as_C_string(),
536 from_module_entry->name()->as_C_string()));
537 }
538
539 log_debug(modules)("add_module_exports(): package %s in module %s is exported to module %s",
540 package_entry->name()->as_C_string(),
541 from_module_entry->name()->as_C_string(),
542 to_module_entry == NULL ? "NULL" :
543 to_module_entry->is_named() ?
544 to_module_entry->name()->as_C_string() : UNNAMED_MODULE);
545
546 // Do nothing if modules are the same.
547 if (from_module_entry != to_module_entry) {
548 package_entry->set_exported(to_module_entry);
549 }
550 }
551
552
553 void Modules::add_module_exports_qualified(jobject from_module, const char* package,
554 jobject to_module, TRAPS) {
555 if (to_module == NULL) {
556 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
557 "to_module is null");
558 }
559 add_module_exports(from_module, package, to_module, CHECK);
560 }
561
562 void Modules::add_reads_module(jobject from_module, jobject to_module, TRAPS) {
563 if (from_module == NULL) {
564 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
565 "from_module is null");
566 }
567
568 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
569 if (from_module_entry == NULL) {
570 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
571 "from_module is not valid");
572 }
573
574 ModuleEntry* to_module_entry;
575 if (to_module != NULL) {
576 to_module_entry = get_module_entry(to_module, CHECK);
577 if (to_module_entry == NULL) {
578 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
579 "to_module is invalid");
580 }
581 } else {
582 to_module_entry = NULL;
583 }
584
585 ResourceMark rm(THREAD);
586 log_debug(modules)("add_reads_module(): Adding read from module %s to module %s",
587 from_module_entry->is_named() ?
588 from_module_entry->name()->as_C_string() : UNNAMED_MODULE,
589 to_module_entry == NULL ? "all unnamed" :
590 (to_module_entry->is_named() ?
591 to_module_entry->name()->as_C_string() : UNNAMED_MODULE));
592
593 // if modules are the same or if from_module is unnamed then no need to add the read.
594 if (from_module_entry != to_module_entry && from_module_entry->is_named()) {
595 from_module_entry->add_read(to_module_entry);
596 }
597 }
598
599 // This method is called by JFR and JNI.
600 jobject Modules::get_module(jclass clazz, TRAPS) {
601 assert(ModuleEntryTable::javabase_defined(),
602 "Attempt to call get_module before " JAVA_BASE_NAME " is defined");
603
604 if (clazz == NULL) {
605 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
606 "class is null", JNI_FALSE);
607 }
608 oop mirror = JNIHandles::resolve_non_null(clazz);
609 if (mirror == NULL) {
610 log_debug(modules)("get_module(): no mirror, returning NULL");
611 return NULL;
612 }
613 if (!java_lang_Class::is_instance(mirror)) {
614 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
615 "Invalid class", JNI_FALSE);
616 }
617
618 oop module = java_lang_Class::module(mirror);
619
620 assert(module != NULL, "java.lang.Class module field not set");
621 assert(java_lang_Module::is_instance(module), "module is not an instance of type java.lang.Module");
622
623 if (log_is_enabled(Debug, modules)) {
624 ResourceMark rm(THREAD);
625 outputStream* logst = Log(modules)::debug_stream();
626 Klass* klass = java_lang_Class::as_Klass(mirror);
627 oop module_name = java_lang_Module::name(module);
628 if (module_name != NULL) {
629 logst->print("get_module(): module ");
630 java_lang_String::print(module_name, tty);
631 } else {
632 logst->print("get_module(): Unamed Module");
633 }
634 if (klass != NULL) {
635 logst->print_cr(" for class %s", klass->external_name());
636 } else {
637 logst->print_cr(" for primitive class");
638 }
639 }
640
641 return JNIHandles::make_local(THREAD, module);
642 }
643
644 jobject Modules::get_named_module(Handle h_loader, const char* package_name, TRAPS) {
645 assert(ModuleEntryTable::javabase_defined(),
646 "Attempt to call get_named_module before " JAVA_BASE_NAME " is defined");
647 assert(h_loader.is_null() || java_lang_ClassLoader::is_subclass(h_loader->klass()),
648 "Class loader is not a subclass of java.lang.ClassLoader");
649 assert(package_name != NULL, "the package_name should not be NULL");
650
651 if (strlen(package_name) == 0) {
652 return NULL;
653 }
654 TempNewSymbol package_sym = SymbolTable::new_symbol(package_name, CHECK_NULL);
655 const PackageEntry* const pkg_entry =
656 get_package_entry_by_name(package_sym, h_loader, THREAD);
657 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
658
659 if (module_entry != NULL && module_entry->module() != NULL && module_entry->is_named()) {
660 return JNIHandles::make_local(THREAD, JNIHandles::resolve(module_entry->module()));
661 }
662 return NULL;
663 }
664
665
666 // This method is called by JFR and by the above method.
667 jobject Modules::get_module(Symbol* package_name, Handle h_loader, TRAPS) {
668 const PackageEntry* const pkg_entry =
669 get_package_entry_by_name(package_name, h_loader, THREAD);
670 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
671
672 if (module_entry != NULL &&
673 module_entry->module() != NULL) {
674 return JNIHandles::make_local(THREAD, JNIHandles::resolve(module_entry->module()));
675 }
676
677 return NULL;
678 }
679
680 void Modules::add_module_package(jobject module, const char* package_name, TRAPS) {
681 ResourceMark rm(THREAD);
682
683 if (module == NULL) {
684 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
685 "module is null");
686 }
687 if (package_name == NULL) {
688 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
689 "package is null");
690 }
691 ModuleEntry* module_entry = get_module_entry(module, CHECK);
692 if (module_entry == NULL) {
693 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
694 "module is invalid");
695 }
696 if (!module_entry->is_named()) {
697 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
698 "module cannot be an unnamed module");
699 }
700 if (!verify_package_name(package_name)) {
701 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
702 err_msg("Invalid package name: %s", package_name));
703 }
704
705 ClassLoaderData *loader_data = module_entry->loader_data();
706
707 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
708 if (!loader_data->is_the_null_class_loader_data() &&
709 !loader_data->is_platform_class_loader_data() &&
710 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&
711 (package_name[JAVAPKG_LEN] == '/' || package_name[JAVAPKG_LEN] == '\0'))) {
712 const char* class_loader_name = SystemDictionary::loader_name(loader_data);
713 size_t pkg_len = strlen(package_name);
714 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len);
715 strncpy(pkg_name, package_name, pkg_len);
716 StringUtils::replace_no_expand(pkg_name, "/", ".");
717 const char* msg_text1 = "Class loader (instance of): ";
718 const char* msg_text2 = " tried to define prohibited package name: ";
719 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;
720 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
721 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);
722 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);
723 }
724
725 log_debug(modules)("add_module_package(): Adding package %s to module %s",
726 package_name, module_entry->name()->as_C_string());
727
728 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);
729 PackageEntryTable* package_table = loader_data->packages();
730 assert(package_table != NULL, "Missing package_table");
731
732 PackageEntry* existing_pkg = NULL;
733 {
734 MutexLocker ml(Module_lock, THREAD);
735
736 // Check that the package does not exist in the class loader's package table.
737 existing_pkg = package_table->lookup_only(pkg_symbol);
738 if (existing_pkg == NULL) {
739 PackageEntry* pkg = package_table->locked_create_entry_or_null(pkg_symbol, module_entry);
740 assert(pkg != NULL, "Unable to create a module's package entry");
741 }
742 }
743 if (existing_pkg != NULL) {
744 throw_dup_pkg_exception(module_entry->name()->as_C_string(), existing_pkg, CHECK);
745 }
746 }
747
748 // Export package in module to all unnamed modules.
749 void Modules::add_module_exports_to_all_unnamed(jobject module, const char* package_name, TRAPS) {
750 if (module == NULL) {
751 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
752 "module is null");
753 }
754 if (package_name == NULL) {
755 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
756 "package is null");
757 }
758 ModuleEntry* module_entry = get_module_entry(module, CHECK);
759 if (module_entry == NULL) {
760 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
761 "module is invalid");
762 }
763
764 if (module_entry->is_named()) { // No-op for unnamed module.
765 PackageEntry *package_entry = get_package_entry(module_entry, package_name, CHECK);
766 ResourceMark rm(THREAD);
767 if (package_entry == NULL) {
768 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
769 err_msg("Package %s not found in module %s",
770 package_name != NULL ? package_name : "",
771 module_entry->name()->as_C_string()));
772 }
773 if (package_entry->module() != module_entry) {
774 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
775 err_msg("Package: %s found in module %s, not in module: %s",
776 package_entry->name()->as_C_string(),
777 package_entry->module()->name()->as_C_string(),
778 module_entry->name()->as_C_string()));
779 }
780
781 log_debug(modules)("add_module_exports_to_all_unnamed(): package %s in module"
782 " %s is exported to all unnamed modules",
783 package_entry->name()->as_C_string(),
784 module_entry->name()->as_C_string());
785
786 // Mark package as exported to all unnamed modules.
787 package_entry->set_is_exported_allUnnamed();
788 }
789 }