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_info(module, load)(JAVA_BASE_NAME " location: %s",
235 module_location != NULL ? module_location : "NULL");
236 log_debug(module)("define_javabase_module(): Definition of module: "
237 JAVA_BASE_NAME ", version: %s, location: %s, package #: %d",
238 module_version != NULL ? module_version : "NULL",
239 module_location != NULL ? module_location : "NULL",
240 pkg_list->length());
241
242 // packages defined to java.base
243 if (log_is_enabled(Trace, module)) {
244 for (int x = 0; x < pkg_list->length(); x++) {
245 log_trace(module)("define_javabase_module(): creation of package %s for module " JAVA_BASE_NAME,
246 (pkg_list->at(x))->as_C_string());
247 }
248 }
249 }
250
251 // Caller needs ResourceMark.
252 void throw_dup_pkg_exception(const char* module_name, PackageEntry* package, TRAPS) {
253 const char* package_name = package->name()->as_C_string();
254 if (package->module()->is_named()) {
255 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
256 err_msg("Package %s for module %s is already in another module, %s, defined to the class loader",
257 package_name, module_name, package->module()->name()->as_C_string()));
258 } else {
259 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
260 err_msg("Package %s for module %s is already in the unnamed module defined to the class loader",
261 package_name, module_name));
262 }
263 }
264
265 void Modules::define_module(jobject module, jboolean is_open, jstring version,
266 jstring location, const char* const* packages,
267 jsize num_packages, TRAPS) {
268 ResourceMark rm(THREAD);
269
270 if (module == NULL) {
271 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
272 }
273
274 if (num_packages < 0) {
275 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
276 "num_packages must be >= 0");
277 }
278
279 if (packages == NULL && num_packages > 0) {
280 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
281 "num_packages should be zero if packages is null");
282 }
283
284 Handle module_handle(THREAD, JNIHandles::resolve(module));
285 if (!java_lang_Module::is_instance(module_handle())) {
286 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
287 "module is not an instance of type java.lang.Module");
288 }
289
290 char* module_name = get_module_name(module_handle(), CHECK);
291 if (module_name == NULL) {
292 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
293 "Module name cannot be null");
294 }
295
296 // Special handling of java.base definition
297 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
298 assert(is_open == JNI_FALSE, "java.base module cannot be open");
299 define_javabase_module(module, version, location, packages, num_packages, CHECK);
300 return;
301 }
302
303 const char* module_version = get_module_version(version);
304
305 oop loader = java_lang_Module::loader(module_handle());
306 // Make sure loader is not the jdk.internal.reflect.DelegatingClassLoader.
307 if (loader != java_lang_ClassLoader::non_reflection_class_loader(loader)) {
308 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
309 "Class loader is an invalid delegating class loader");
310 }
311 Handle h_loader = Handle(THREAD, loader);
312
313 // Check that the list of packages has no duplicates and that the
314 // packages are syntactically ok.
315 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
316 for (int x = 0; x < num_packages; x++) {
317 const char* package_name = packages[x];
318 if (!verify_package_name(package_name)) {
319 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
320 err_msg("Invalid package name: %s for module: %s",
321 package_name, module_name));
322 }
323
324 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
325 if (!h_loader.is_null() &&
326 !SystemDictionary::is_platform_class_loader(h_loader()) &&
327 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&
328 (package_name[JAVAPKG_LEN] == '/' || package_name[JAVAPKG_LEN] == '\0'))) {
329 const char* class_loader_name = SystemDictionary::loader_name(h_loader());
330 size_t pkg_len = strlen(package_name);
331 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len);
332 strncpy(pkg_name, package_name, pkg_len);
333 StringUtils::replace_no_expand(pkg_name, "/", ".");
334 const char* msg_text1 = "Class loader (instance of): ";
335 const char* msg_text2 = " tried to define prohibited package name: ";
336 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;
337 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
338 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);
339 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);
340 }
341
342 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);
343 pkg_list->append(pkg_symbol);
344 }
345
346 ModuleEntryTable* module_table = get_module_entry_table(h_loader, CHECK);
347 assert(module_table != NULL, "module entry table shouldn't be null");
348
349 // Create symbol* entry for module name.
350 TempNewSymbol module_symbol = SymbolTable::new_symbol(module_name, CHECK);
351
352 bool dupl_modules = false;
353
354 // Create symbol* entry for module version.
355 TempNewSymbol version_symbol;
356 if (module_version != NULL) {
357 version_symbol = SymbolTable::new_symbol(module_version, CHECK);
358 } else {
359 version_symbol = NULL;
360 }
361
362 // Create symbol* entry for module location.
363 const char* module_location = NULL;
364 TempNewSymbol location_symbol = NULL;
365 if (location != NULL) {
366 module_location =
367 java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(location));
368 if (module_location != NULL) {
369 location_symbol = SymbolTable::new_symbol(module_location, CHECK);
370 }
371 }
372
373 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data_or_null(h_loader());
374 assert(loader_data != NULL, "class loader data shouldn't be null");
375
376 PackageEntryTable* package_table = NULL;
377 PackageEntry* existing_pkg = NULL;
378 {
379 MutexLocker ml(Module_lock, THREAD);
380
381 if (num_packages > 0) {
382 package_table = get_package_entry_table(h_loader, CHECK);
383 assert(package_table != NULL, "Missing package_table");
384
385 // Check that none of the packages exist in the class loader's package table.
386 for (int x = 0; x < pkg_list->length(); x++) {
387 existing_pkg = package_table->lookup_only(pkg_list->at(x));
388 if (existing_pkg != NULL) {
389 // This could be because the module was already defined. If so,
390 // report that error instead of the package error.
391 if (module_table->lookup_only(module_symbol) != NULL) {
392 dupl_modules = true;
393 }
394 break;
395 }
396 }
397 } // if (num_packages > 0)...
398
399 // Add the module and its packages.
400 if (!dupl_modules && existing_pkg == NULL) {
401 // Create the entry for this module in the class loader's module entry table.
402 ModuleEntry* module_entry = module_table->locked_create_entry_or_null(module_handle,
403 (is_open == JNI_TRUE), module_symbol,
404 version_symbol, location_symbol, loader_data);
405
406 if (module_entry == NULL) {
407 dupl_modules = true;
408 } else {
409 // Add the packages.
410 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package table");
411 PackageEntry* pkg;
412 for (int y = 0; y < pkg_list->length(); y++) {
413 pkg = package_table->locked_create_entry_or_null(pkg_list->at(y), module_entry);
414 assert(pkg != NULL, "Unable to create a module's package entry");
415
416 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
417 // the Symbol* that was created above for each package. The refcount was incremented
418 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
419 pkg_list->at(y)->decrement_refcount();
420 }
421
422 // Store pointer to ModuleEntry record in java.lang.Module object.
423 java_lang_Module::set_module_entry(module_handle(), module_entry);
424 }
425 }
426 } // Release the lock
427
428 // any errors ?
429 if (dupl_modules) {
430 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
431 err_msg("Module %s is already defined", module_name));
432 } else if (existing_pkg != NULL) {
433 throw_dup_pkg_exception(module_name, existing_pkg, CHECK);
434 }
435
436 log_info(module, load)("%s location: %s", module_name,
437 module_location != NULL ? module_location : "NULL");
438 if (log_is_enabled(Debug, module)) {
439 outputStream* logst = Log(module)::debug_stream();
440 logst->print("define_module(): creation of module: %s, version: %s, location: %s, ",
441 module_name, module_version != NULL ? module_version : "NULL",
442 module_location != NULL ? module_location : "NULL");
443 loader_data->print_value_on(logst);
444 logst->print_cr(", package #: %d", pkg_list->length());
445 for (int y = 0; y < pkg_list->length(); y++) {
446 log_trace(module)("define_module(): creation of package %s for module %s",
447 (pkg_list->at(y))->as_C_string(), module_name);
448 }
449 }
450
451 // If the module is defined to the boot loader and an exploded build is being
452 // used, prepend <java.home>/modules/modules_name to the system boot class path.
453 if (loader == NULL && !ClassLoader::has_jrt_entry()) {
454 ClassLoader::add_to_exploded_build_list(module_symbol, CHECK);
455 }
456 }
457
458 void Modules::set_bootloader_unnamed_module(jobject module, TRAPS) {
459 ResourceMark rm(THREAD);
460
461 if (module == NULL) {
462 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
463 }
464 Handle module_handle(THREAD, JNIHandles::resolve(module));
465 if (!java_lang_Module::is_instance(module_handle())) {
466 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
467 "module is not an instance of type java.lang.Module");
468 }
469
470 // Ensure that this is an unnamed module
471 oop name = java_lang_Module::name(module_handle());
472 if (name != NULL) {
473 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
474 "boot loader's unnamed module's java.lang.Module has a name");
475 }
476
477 // Validate java_base's loader is the boot loader.
478 oop loader = java_lang_Module::loader(module_handle());
479 if (loader != NULL) {
480 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
481 "Class loader must be the boot class loader");
482 }
483 Handle h_loader(THREAD, loader);
484
485 log_debug(module)("set_bootloader_unnamed_module(): recording unnamed module for boot loader");
486
487 // Set java.lang.Module for the boot loader's unnamed module
488 ClassLoaderData* boot_loader_data = ClassLoaderData::the_null_class_loader_data();
489 ModuleEntry* unnamed_module = boot_loader_data->unnamed_module();
490 assert(unnamed_module != NULL, "boot loader's unnamed ModuleEntry not defined");
491 unnamed_module->set_module(boot_loader_data->add_handle(module_handle));
492 // Store pointer to the ModuleEntry in the unnamed module's java.lang.Module object.
493 java_lang_Module::set_module_entry(module_handle(), unnamed_module);
494 }
495
496 void Modules::add_module_exports(jobject from_module, const char* package_name, jobject to_module, TRAPS) {
497 if (package_name == NULL) {
498 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
499 "package is null");
500 }
501 if (from_module == NULL) {
502 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
503 "from_module is null");
504 }
505 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
506 if (from_module_entry == NULL) {
507 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
508 "from_module cannot be found");
509 }
510
511 // All packages in unnamed and open modules are exported by default.
512 if (!from_module_entry->is_named() || from_module_entry->is_open()) return;
513
514 ModuleEntry* to_module_entry;
515 if (to_module == NULL) {
516 to_module_entry = NULL; // It's an unqualified export.
517 } else {
518 to_module_entry = get_module_entry(to_module, CHECK);
519 if (to_module_entry == NULL) {
520 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
521 "to_module is invalid");
522 }
523 }
524
525 PackageEntry *package_entry = get_package_entry(from_module_entry, package_name, CHECK);
526 ResourceMark rm(THREAD);
527 if (package_entry == NULL) {
528 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
529 err_msg("Package %s not found in from_module %s",
530 package_name != NULL ? package_name : "",
531 from_module_entry->name()->as_C_string()));
532 }
533 if (package_entry->module() != from_module_entry) {
534 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
535 err_msg("Package: %s found in module %s, not in from_module: %s",
536 package_entry->name()->as_C_string(),
537 package_entry->module()->name()->as_C_string(),
538 from_module_entry->name()->as_C_string()));
539 }
540
541 log_debug(module)("add_module_exports(): package %s in module %s is exported to module %s",
542 package_entry->name()->as_C_string(),
543 from_module_entry->name()->as_C_string(),
544 to_module_entry == NULL ? "NULL" :
545 to_module_entry->is_named() ?
546 to_module_entry->name()->as_C_string() : UNNAMED_MODULE);
547
548 // Do nothing if modules are the same.
549 if (from_module_entry != to_module_entry) {
550 package_entry->set_exported(to_module_entry);
551 }
552 }
553
554
555 void Modules::add_module_exports_qualified(jobject from_module, const char* package,
556 jobject to_module, TRAPS) {
557 if (to_module == NULL) {
558 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
559 "to_module is null");
560 }
561 add_module_exports(from_module, package, to_module, CHECK);
562 }
563
564 void Modules::add_reads_module(jobject from_module, jobject to_module, TRAPS) {
565 if (from_module == NULL) {
566 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
567 "from_module is null");
568 }
569
570 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
571 if (from_module_entry == NULL) {
572 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
573 "from_module is not valid");
574 }
575
576 ModuleEntry* to_module_entry;
577 if (to_module != NULL) {
578 to_module_entry = get_module_entry(to_module, CHECK);
579 if (to_module_entry == NULL) {
580 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
581 "to_module is invalid");
582 }
583 } else {
584 to_module_entry = NULL;
585 }
586
587 ResourceMark rm(THREAD);
588 log_debug(module)("add_reads_module(): Adding read from module %s to module %s",
589 from_module_entry->is_named() ?
590 from_module_entry->name()->as_C_string() : UNNAMED_MODULE,
591 to_module_entry == NULL ? "all unnamed" :
592 (to_module_entry->is_named() ?
593 to_module_entry->name()->as_C_string() : UNNAMED_MODULE));
594
595 // if modules are the same or if from_module is unnamed then no need to add the read.
596 if (from_module_entry != to_module_entry && from_module_entry->is_named()) {
597 from_module_entry->add_read(to_module_entry);
598 }
599 }
600
601 // This method is called by JFR and JNI.
602 jobject Modules::get_module(jclass clazz, TRAPS) {
603 assert(ModuleEntryTable::javabase_defined(),
604 "Attempt to call get_module before " JAVA_BASE_NAME " is defined");
605
606 if (clazz == NULL) {
607 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
608 "class is null", JNI_FALSE);
609 }
610 oop mirror = JNIHandles::resolve_non_null(clazz);
611 if (mirror == NULL) {
612 log_debug(module)("get_module(): no mirror, returning NULL");
613 return NULL;
614 }
615 if (!java_lang_Class::is_instance(mirror)) {
616 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
617 "Invalid class", JNI_FALSE);
618 }
619
620 oop module = java_lang_Class::module(mirror);
621
622 assert(module != NULL, "java.lang.Class module field not set");
623 assert(java_lang_Module::is_instance(module), "module is not an instance of type java.lang.Module");
624
625 if (log_is_enabled(Debug, module)) {
626 ResourceMark rm(THREAD);
627 outputStream* logst = Log(module)::debug_stream();
628 Klass* klass = java_lang_Class::as_Klass(mirror);
629 oop module_name = java_lang_Module::name(module);
630 if (module_name != NULL) {
631 logst->print("get_module(): module ");
632 java_lang_String::print(module_name, tty);
633 } else {
634 logst->print("get_module(): Unamed Module");
635 }
636 if (klass != NULL) {
637 logst->print_cr(" for class %s", klass->external_name());
638 } else {
639 logst->print_cr(" for primitive class");
640 }
641 }
642
643 return JNIHandles::make_local(THREAD, module);
644 }
645
646 jobject Modules::get_named_module(Handle h_loader, const char* package_name, TRAPS) {
647 assert(ModuleEntryTable::javabase_defined(),
648 "Attempt to call get_named_module before " JAVA_BASE_NAME " is defined");
649 assert(h_loader.is_null() || java_lang_ClassLoader::is_subclass(h_loader->klass()),
650 "Class loader is not a subclass of java.lang.ClassLoader");
651 assert(package_name != NULL, "the package_name should not be NULL");
652
653 if (strlen(package_name) == 0) {
654 return NULL;
655 }
656 TempNewSymbol package_sym = SymbolTable::new_symbol(package_name, CHECK_NULL);
657 const PackageEntry* const pkg_entry =
658 get_package_entry_by_name(package_sym, h_loader, THREAD);
659 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
660
661 if (module_entry != NULL && module_entry->module() != NULL && module_entry->is_named()) {
662 return JNIHandles::make_local(THREAD, JNIHandles::resolve(module_entry->module()));
663 }
664 return NULL;
665 }
666
667
668 // This method is called by JFR and by the above method.
669 jobject Modules::get_module(Symbol* package_name, Handle h_loader, TRAPS) {
670 const PackageEntry* const pkg_entry =
671 get_package_entry_by_name(package_name, h_loader, THREAD);
672 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
673
674 if (module_entry != NULL &&
675 module_entry->module() != NULL) {
676 return JNIHandles::make_local(THREAD, JNIHandles::resolve(module_entry->module()));
677 }
678
679 return NULL;
680 }
681
682 void Modules::add_module_package(jobject module, const char* package_name, TRAPS) {
683 ResourceMark rm(THREAD);
684
685 if (module == NULL) {
686 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
687 "module is null");
688 }
689 if (package_name == NULL) {
690 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
691 "package is null");
692 }
693 ModuleEntry* module_entry = get_module_entry(module, CHECK);
694 if (module_entry == NULL) {
695 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
696 "module is invalid");
697 }
698 if (!module_entry->is_named()) {
699 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
700 "module cannot be an unnamed module");
701 }
702 if (!verify_package_name(package_name)) {
703 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
704 err_msg("Invalid package name: %s", package_name));
705 }
706
707 ClassLoaderData *loader_data = module_entry->loader_data();
708
709 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
710 if (!loader_data->is_the_null_class_loader_data() &&
711 !loader_data->is_platform_class_loader_data() &&
712 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&
713 (package_name[JAVAPKG_LEN] == '/' || package_name[JAVAPKG_LEN] == '\0'))) {
714 const char* class_loader_name = SystemDictionary::loader_name(loader_data);
715 size_t pkg_len = strlen(package_name);
716 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len);
717 strncpy(pkg_name, package_name, pkg_len);
718 StringUtils::replace_no_expand(pkg_name, "/", ".");
719 const char* msg_text1 = "Class loader (instance of): ";
720 const char* msg_text2 = " tried to define prohibited package name: ";
721 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;
722 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
723 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);
724 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);
725 }
726
727 log_debug(module)("add_module_package(): Adding package %s to module %s",
728 package_name, module_entry->name()->as_C_string());
729
730 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);
731 PackageEntryTable* package_table = loader_data->packages();
732 assert(package_table != NULL, "Missing package_table");
733
734 PackageEntry* existing_pkg = NULL;
735 {
736 MutexLocker ml(Module_lock, THREAD);
737
738 // Check that the package does not exist in the class loader's package table.
739 existing_pkg = package_table->lookup_only(pkg_symbol);
740 if (existing_pkg == NULL) {
741 PackageEntry* pkg = package_table->locked_create_entry_or_null(pkg_symbol, module_entry);
742 assert(pkg != NULL, "Unable to create a module's package entry");
743 }
744 }
745 if (existing_pkg != NULL) {
746 throw_dup_pkg_exception(module_entry->name()->as_C_string(), existing_pkg, CHECK);
747 }
748 }
749
750 // Export package in module to all unnamed modules.
751 void Modules::add_module_exports_to_all_unnamed(jobject module, const char* package_name, TRAPS) {
752 if (module == NULL) {
753 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
754 "module is null");
755 }
756 if (package_name == NULL) {
757 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
758 "package is null");
759 }
760 ModuleEntry* module_entry = get_module_entry(module, CHECK);
761 if (module_entry == NULL) {
762 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
763 "module is invalid");
764 }
765
766 if (module_entry->is_named()) { // No-op for unnamed module.
767 PackageEntry *package_entry = get_package_entry(module_entry, package_name, CHECK);
768 ResourceMark rm(THREAD);
769 if (package_entry == NULL) {
770 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
771 err_msg("Package %s not found in module %s",
772 package_name != NULL ? package_name : "",
773 module_entry->name()->as_C_string()));
774 }
775 if (package_entry->module() != module_entry) {
776 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
777 err_msg("Package: %s found in module %s, not in module: %s",
778 package_entry->name()->as_C_string(),
779 package_entry->module()->name()->as_C_string(),
780 module_entry->name()->as_C_string()));
781 }
782
783 log_debug(module)("add_module_exports_to_all_unnamed(): package %s in module"
784 " %s is exported to all unnamed modules",
785 package_entry->name()->as_C_string(),
786 module_entry->name()->as_C_string());
787
788 // Mark package as exported to all unnamed modules.
789 package_entry->set_is_exported_allUnnamed();
790 }
791 }