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_reflect_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_reflect_Module::is_instance(module_h())) {
102 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
103 "module is not an instance of type java.lang.reflect.Module");
104 }
105 return java_lang_reflect_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_reflect_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.reflect.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 for (int x = 0; x < pkg_list->length(); x++) {
242 log_trace(modules)("define_javabase_module(): creation of package %s for module " JAVA_BASE_NAME,
243 (pkg_list->at(x))->as_C_string());
244 }
245 }
246
247 // Caller needs ResourceMark.
248 void throw_dup_pkg_exception(const char* module_name, PackageEntry* package, TRAPS) {
249 const char* package_name = package->name()->as_C_string();
250 if (package->module()->is_named()) {
251 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
252 err_msg("Package %s for module %s is already in another module, %s, defined to the class loader",
253 package_name, module_name, package->module()->name()->as_C_string()));
254 } else {
255 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
256 err_msg("Package %s for module %s is already in the unnamed module defined to the class loader",
257 package_name, module_name));
258 }
259 }
260
261 void Modules::define_module(jobject module, jstring version,
262 jstring location, const char* const* packages,
263 jsize num_packages, TRAPS) {
264 ResourceMark rm(THREAD);
265
266 if (module == NULL) {
267 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
268 }
269
270 if (num_packages < 0) {
271 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
272 "num_packages must be >= 0");
273 }
274
275 if (packages == NULL && num_packages > 0) {
276 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
277 "num_packages should be zero if packages is null");
278 }
279
280 Handle module_handle(THREAD, JNIHandles::resolve(module));
281 if (!java_lang_reflect_Module::is_instance(module_handle())) {
282 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
283 "module is not an instance of type java.lang.reflect.Module");
284 }
285
286 char* module_name = get_module_name(module_handle(), CHECK);
287 if (module_name == NULL) {
288 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
289 "Module name cannot be null");
290 }
291
292 // Special handling of java.base definition
293 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
294 define_javabase_module(module, version, location, packages, num_packages, CHECK);
295 return;
296 }
297
298 const char* module_version = get_module_version(version);
299
300 oop loader = java_lang_reflect_Module::loader(module_handle());
301 // Make sure loader is not the jdk.internal.reflect.DelegatingClassLoader.
302 if (loader != java_lang_ClassLoader::non_reflection_class_loader(loader)) {
303 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
304 "Class loader is an invalid delegating class loader");
305 }
306 Handle h_loader = Handle(THREAD, loader);
307
308 // Check that the list of packages has no duplicates and that the
309 // packages are syntactically ok.
310 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
311 for (int x = 0; x < num_packages; x++) {
312 const char* package_name = packages[x];
313 if (!verify_package_name(package_name)) {
314 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
315 err_msg("Invalid package name: %s for module: %s",
316 package_name, module_name));
317 }
318
319 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
320 if (!h_loader.is_null() &&
321 !SystemDictionary::is_platform_class_loader(h_loader()) &&
322 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&
323 (package_name[JAVAPKG_LEN] == '/' || package_name[JAVAPKG_LEN] == '\0'))) {
324 const char* class_loader_name = SystemDictionary::loader_name(h_loader());
325 size_t pkg_len = strlen(package_name);
326 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len);
327 strncpy(pkg_name, package_name, pkg_len);
328 StringUtils::replace_no_expand(pkg_name, "/", ".");
329 const char* msg_text1 = "Class loader (instance of): ";
330 const char* msg_text2 = " tried to define prohibited package name: ";
331 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;
332 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
333 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);
334 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);
335 }
336
337 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);
338 pkg_list->append(pkg_symbol);
339 }
340
341 ModuleEntryTable* module_table = get_module_entry_table(h_loader, CHECK);
342 assert(module_table != NULL, "module entry table shouldn't be null");
343
344 // Create symbol* entry for module name.
345 TempNewSymbol module_symbol = SymbolTable::new_symbol(module_name, CHECK);
346
347 bool dupl_modules = false;
348
349 // Create symbol* entry for module version.
350 TempNewSymbol version_symbol;
351 if (module_version != NULL) {
352 version_symbol = SymbolTable::new_symbol(module_version, CHECK);
353 } else {
354 version_symbol = NULL;
355 }
356
357 // Create symbol* entry for module location.
358 const char* module_location = NULL;
359 TempNewSymbol location_symbol = NULL;
360 if (location != NULL) {
361 module_location =
362 java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(location));
363 if (module_location != NULL) {
364 location_symbol = SymbolTable::new_symbol(module_location, CHECK);
365 }
366 }
367
368 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data_or_null(h_loader());
369 assert(loader_data != NULL, "class loader data shouldn't be null");
370
371 PackageEntryTable* package_table = NULL;
372 PackageEntry* existing_pkg = NULL;
373 {
374 MutexLocker ml(Module_lock, THREAD);
375
376 if (num_packages > 0) {
377 package_table = get_package_entry_table(h_loader, CHECK);
378 assert(package_table != NULL, "Missing package_table");
379
380 // Check that none of the packages exist in the class loader's package table.
381 for (int x = 0; x < pkg_list->length(); x++) {
382 existing_pkg = package_table->lookup_only(pkg_list->at(x));
383 if (existing_pkg != NULL) {
384 // This could be because the module was already defined. If so,
385 // report that error instead of the package error.
386 if (module_table->lookup_only(module_symbol) != NULL) {
387 dupl_modules = true;
388 }
389 break;
390 }
391 }
392 } // if (num_packages > 0)...
393
394 // Add the module and its packages.
395 if (!dupl_modules && existing_pkg == NULL) {
396 // Create the entry for this module in the class loader's module entry table.
397 ModuleEntry* module_entry = module_table->locked_create_entry_or_null(module_handle, module_symbol,
398 version_symbol, location_symbol, loader_data);
399
400 if (module_entry == NULL) {
401 dupl_modules = true;
402 } else {
403 // Add the packages.
404 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package table");
405 PackageEntry* pkg;
406 for (int y = 0; y < pkg_list->length(); y++) {
407 pkg = package_table->locked_create_entry_or_null(pkg_list->at(y), module_entry);
408 assert(pkg != NULL, "Unable to create a module's package entry");
409
410 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
411 // the Symbol* that was created above for each package. The refcount was incremented
412 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
413 pkg_list->at(y)->decrement_refcount();
414 }
415
416 // Store pointer to ModuleEntry record in java.lang.reflect.Module object.
417 java_lang_reflect_Module::set_module_entry(module_handle(), module_entry);
418 }
419 }
420 } // Release the lock
421
422 // any errors ?
423 if (dupl_modules) {
424 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
425 err_msg("Module %s is already defined", module_name));
426 } else if (existing_pkg != NULL) {
427 throw_dup_pkg_exception(module_name, existing_pkg, CHECK);
428 }
429
430 if (log_is_enabled(Debug, modules)) {
431 outputStream* logst = Log(modules)::debug_stream();
432 logst->print("define_module(): creation of module: %s, version: %s, location: %s, ",
433 module_name, module_version != NULL ? module_version : "NULL",
434 module_location != NULL ? module_location : "NULL");
435 loader_data->print_value_on(logst);
436 logst->print_cr(", package #: %d", pkg_list->length());
437 for (int y = 0; y < pkg_list->length(); y++) {
438 log_trace(modules)("define_module(): creation of package %s for module %s",
439 (pkg_list->at(y))->as_C_string(), module_name);
440 }
441 }
442
443 // If the module is defined to the boot loader and an exploded build is being
444 // used, prepend <java.home>/modules/modules_name, if it exists, to the system boot class path.
445 if (loader == NULL &&
446 !Universe::is_module_initialized() &&
447 !ClassLoader::has_jrt_entry()) {
448 ClassLoader::add_to_exploded_build_list(module_symbol, CHECK);
449 }
450 }
451
452 void Modules::set_bootloader_unnamed_module(jobject module, TRAPS) {
453 ResourceMark rm(THREAD);
454
455 if (module == NULL) {
456 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
457 }
458 Handle module_handle(THREAD, JNIHandles::resolve(module));
459 if (!java_lang_reflect_Module::is_instance(module_handle())) {
460 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
461 "module is not an instance of type java.lang.reflect.Module");
462 }
463
464 // Ensure that this is an unnamed module
465 oop name = java_lang_reflect_Module::name(module_handle());
466 if (name != NULL) {
467 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
468 "boot loader's unnamed module's java.lang.reflect.Module has a name");
469 }
470
471 // Validate java_base's loader is the boot loader.
472 oop loader = java_lang_reflect_Module::loader(module_handle());
473 if (loader != NULL) {
474 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
475 "Class loader must be the boot class loader");
476 }
477 Handle h_loader(THREAD, loader);
478
479 log_debug(modules)("set_bootloader_unnamed_module(): recording unnamed module for boot loader");
480
481 // Ensure the boot loader's PackageEntryTable has been created
482 ModuleEntryTable* module_table = get_module_entry_table(h_loader, CHECK);
483
484 // Set java.lang.reflect.Module for the boot loader's unnamed module
485 ModuleEntry* unnamed_module = module_table->unnamed_module();
486 assert(unnamed_module != NULL, "boot loader's unnamed ModuleEntry not defined");
487 unnamed_module->set_module(ClassLoaderData::the_null_class_loader_data()->add_handle(module_handle));
488 // Store pointer to the ModuleEntry in the unnamed module's java.lang.reflect.Module object.
489 java_lang_reflect_Module::set_module_entry(module_handle(), unnamed_module);
490 }
491
492 void Modules::add_module_exports(jobject from_module, const char* package_name, jobject to_module, TRAPS) {
493 if (package_name == NULL) {
494 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
495 "package is null");
496 }
497 if (from_module == NULL) {
498 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
499 "from_module is null");
500 }
501 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
502 if (from_module_entry == NULL) {
503 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
504 "from_module cannot be found");
505 }
506
507 // All packages in unnamed are exported by default.
508 if (!from_module_entry->is_named()) return;
509
510 ModuleEntry* to_module_entry;
511 if (to_module == NULL) {
512 to_module_entry = NULL; // It's an unqualified export.
513 } else {
514 to_module_entry = get_module_entry(to_module, CHECK);
515 if (to_module_entry == NULL) {
516 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
517 "to_module is invalid");
518 }
519 }
520
521 PackageEntry *package_entry = get_package_entry(from_module_entry, package_name, CHECK);
522 ResourceMark rm(THREAD);
523 if (package_entry == NULL) {
524 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
525 err_msg("Package %s not found in from_module %s",
526 package_name != NULL ? package_name : "",
527 from_module_entry->name()->as_C_string()));
528 }
529 if (package_entry->module() != from_module_entry) {
530 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
531 err_msg("Package: %s found in module %s, not in from_module: %s",
532 package_entry->name()->as_C_string(),
533 package_entry->module()->name()->as_C_string(),
534 from_module_entry->name()->as_C_string()));
535 }
536
537 log_debug(modules)("add_module_exports(): package %s in module %s is exported to module %s",
538 package_entry->name()->as_C_string(),
539 from_module_entry->name()->as_C_string(),
540 to_module_entry == NULL ? "NULL" :
541 to_module_entry->is_named() ?
542 to_module_entry->name()->as_C_string() : UNNAMED_MODULE);
543
544 // Do nothing if modules are the same.
545 if (from_module_entry != to_module_entry) {
546 package_entry->set_exported(to_module_entry);
547 }
548 }
549
550
551 void Modules::add_module_exports_qualified(jobject from_module, const char* package,
552 jobject to_module, TRAPS) {
553 if (to_module == NULL) {
554 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
555 "to_module is null");
556 }
557 add_module_exports(from_module, package, to_module, CHECK);
558 }
559
560 void Modules::add_reads_module(jobject from_module, jobject to_module, TRAPS) {
561 if (from_module == NULL) {
562 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
563 "from_module is null");
564 }
565
566 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
567 if (from_module_entry == NULL) {
568 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
569 "from_module is not valid");
570 }
571
572 ModuleEntry* to_module_entry;
573 if (to_module != NULL) {
574 to_module_entry = get_module_entry(to_module, CHECK);
575 if (to_module_entry == NULL) {
576 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
577 "to_module is invalid");
578 }
579 } else {
580 to_module_entry = NULL;
581 }
582
583 ResourceMark rm(THREAD);
584 log_debug(modules)("add_reads_module(): Adding read from module %s to module %s",
585 from_module_entry->is_named() ?
586 from_module_entry->name()->as_C_string() : UNNAMED_MODULE,
587 to_module_entry == NULL ? "all unnamed" :
588 (to_module_entry->is_named() ?
589 to_module_entry->name()->as_C_string() : UNNAMED_MODULE));
590
591 // if modules are the same or if from_module is unnamed then no need to add the read.
592 if (from_module_entry != to_module_entry && from_module_entry->is_named()) {
593 from_module_entry->add_read(to_module_entry);
594 }
595 }
596
597 // This method is called by JFR and JNI.
598 jobject Modules::get_module(jclass clazz, TRAPS) {
599 assert(ModuleEntryTable::javabase_defined(),
600 "Attempt to call get_module before " JAVA_BASE_NAME " is defined");
601
602 if (clazz == NULL) {
603 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
604 "class is null", JNI_FALSE);
605 }
606 oop mirror = JNIHandles::resolve_non_null(clazz);
607 if (mirror == NULL) {
608 log_debug(modules)("get_module(): no mirror, returning NULL");
609 return NULL;
610 }
611 if (!java_lang_Class::is_instance(mirror)) {
612 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
613 "Invalid class", JNI_FALSE);
614 }
615
616 oop module = java_lang_Class::module(mirror);
617
618 assert(module != NULL, "java.lang.Class module field not set");
619 assert(java_lang_reflect_Module::is_instance(module), "module is not an instance of type java.lang.reflect.Module");
620
621 if (log_is_enabled(Debug, modules)) {
622 ResourceMark rm(THREAD);
623 outputStream* logst = Log(modules)::debug_stream();
624 Klass* klass = java_lang_Class::as_Klass(mirror);
625 oop module_name = java_lang_reflect_Module::name(module);
626 if (module_name != NULL) {
627 logst->print("get_module(): module ");
628 java_lang_String::print(module_name, tty);
629 } else {
630 logst->print("get_module(): Unamed Module");
631 }
632 if (klass != NULL) {
633 logst->print_cr(" for class %s", klass->external_name());
634 } else {
635 logst->print_cr(" for primitive class");
636 }
637 }
638
639 return JNIHandles::make_local(THREAD, module);
640 }
641
642 jobject Modules::get_named_module(Handle h_loader, const char* package_name, TRAPS) {
643 assert(ModuleEntryTable::javabase_defined(),
644 "Attempt to call get_named_module before " JAVA_BASE_NAME " is defined");
645 assert(h_loader.is_null() || java_lang_ClassLoader::is_subclass(h_loader->klass()),
646 "Class loader is not a subclass of java.lang.ClassLoader");
647 assert(package_name != NULL, "the package_name should not be NULL");
648
649 if (strlen(package_name) == 0) {
650 return NULL;
651 }
652 TempNewSymbol package_sym = SymbolTable::new_symbol(package_name, CHECK_NULL);
653 const PackageEntry* const pkg_entry =
654 get_package_entry_by_name(package_sym, h_loader, THREAD);
655 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
656
657 if (module_entry != NULL && module_entry->module() != NULL && module_entry->is_named()) {
658 return JNIHandles::make_local(THREAD, JNIHandles::resolve(module_entry->module()));
659 }
660 return NULL;
661 }
662
663
664 // This method is called by JFR and by the above method.
665 jobject Modules::get_module(Symbol* package_name, Handle h_loader, TRAPS) {
666 const PackageEntry* const pkg_entry =
667 get_package_entry_by_name(package_name, h_loader, THREAD);
668 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
669
670 if (module_entry != NULL &&
671 module_entry->module() != NULL) {
672 return JNIHandles::make_local(THREAD, JNIHandles::resolve(module_entry->module()));
673 }
674
675 return NULL;
676 }
677
678 void Modules::add_module_package(jobject module, const char* package_name, TRAPS) {
679 ResourceMark rm(THREAD);
680
681 if (module == NULL) {
682 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
683 "module is null");
684 }
685 if (package_name == NULL) {
686 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
687 "package is null");
688 }
689 ModuleEntry* module_entry = get_module_entry(module, CHECK);
690 if (module_entry == NULL) {
691 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
692 "module is invalid");
693 }
694 if (!module_entry->is_named()) {
695 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
696 "module cannot be an unnamed module");
697 }
698 if (!verify_package_name(package_name)) {
699 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
700 err_msg("Invalid package name: %s", package_name));
701 }
702
703 ClassLoaderData *loader_data = module_entry->loader_data();
704
705 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
706 if (!loader_data->is_the_null_class_loader_data() &&
707 !loader_data->is_platform_class_loader_data() &&
708 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&
709 (package_name[JAVAPKG_LEN] == '/' || package_name[JAVAPKG_LEN] == '\0'))) {
710 const char* class_loader_name = SystemDictionary::loader_name(loader_data);
711 size_t pkg_len = strlen(package_name);
712 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len);
713 strncpy(pkg_name, package_name, pkg_len);
714 StringUtils::replace_no_expand(pkg_name, "/", ".");
715 const char* msg_text1 = "Class loader (instance of): ";
716 const char* msg_text2 = " tried to define prohibited package name: ";
717 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;
718 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
719 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);
720 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);
721 }
722
723 log_debug(modules)("add_module_package(): Adding package %s to module %s",
724 package_name, module_entry->name()->as_C_string());
725
726 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);
727 PackageEntryTable* package_table = loader_data->packages();
728 assert(package_table != NULL, "Missing package_table");
729
730 PackageEntry* existing_pkg = NULL;
731 {
732 MutexLocker ml(Module_lock, THREAD);
733
734 // Check that the package does not exist in the class loader's package table.
735 existing_pkg = package_table->lookup_only(pkg_symbol);
736 if (existing_pkg == NULL) {
737 PackageEntry* pkg = package_table->locked_create_entry_or_null(pkg_symbol, module_entry);
738 assert(pkg != NULL, "Unable to create a module's package entry");
739 }
740 }
741 if (existing_pkg != NULL) {
742 throw_dup_pkg_exception(module_entry->name()->as_C_string(), existing_pkg, CHECK);
743 }
744 }
745
746 // Export package in module to all unnamed modules.
747 void Modules::add_module_exports_to_all_unnamed(jobject module, const char* package_name, TRAPS) {
748 if (module == NULL) {
749 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
750 "module is null");
751 }
752 if (package_name == NULL) {
753 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
754 "package is null");
755 }
756 ModuleEntry* module_entry = get_module_entry(module, CHECK);
757 if (module_entry == NULL) {
758 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
759 "module is invalid");
760 }
761
762 if (module_entry->is_named()) { // No-op for unnamed module.
763 PackageEntry *package_entry = get_package_entry(module_entry, package_name, CHECK);
764 ResourceMark rm(THREAD);
765 if (package_entry == NULL) {
766 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
767 err_msg("Package %s not found in module %s",
768 package_name != NULL ? package_name : "",
769 module_entry->name()->as_C_string()));
770 }
771 if (package_entry->module() != module_entry) {
772 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
773 err_msg("Package: %s found in module %s, not in module: %s",
774 package_entry->name()->as_C_string(),
775 package_entry->module()->name()->as_C_string(),
776 module_entry->name()->as_C_string()));
777 }
778
779 log_debug(modules)("add_module_exports_to_all_unnamed(): package %s in module"
780 " %s is exported to all unnamed modules",
781 package_entry->name()->as_C_string(),
782 module_entry->name()->as_C_string());
783
784 // Mark package as exported to all unnamed modules.
785 package_entry->set_is_exported_allUnnamed();
786 }
787 }