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 ModuleEntry* get_unnamed_module(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->unnamed_module();
97 }
98
99 static PackageEntryTable* get_package_entry_table(Handle h_loader, TRAPS) {
100 // This code can be called during start-up, before the classLoader's classLoader data got
101 // created. So, call register_loader() to make sure the classLoader data gets created.
102 ClassLoaderData *loader_cld = SystemDictionary::register_loader(h_loader, CHECK_NULL);
103 return loader_cld->packages();
104 }
105
106 static ModuleEntry* get_module_entry(jobject module, TRAPS) {
107 Handle module_h(THREAD, JNIHandles::resolve(module));
108 if (!java_lang_reflect_Module::is_instance(module_h())) {
109 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
110 "module is not an instance of type java.lang.reflect.Module");
111 }
112 return java_lang_reflect_Module::module_entry(module_h(), CHECK_NULL);
113 }
114
115 static PackageEntry* get_package_entry(ModuleEntry* module_entry, const char* package_name, TRAPS) {
116 ResourceMark rm(THREAD);
117 if (package_name == NULL) return NULL;
118 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(package_name, CHECK_NULL);
119 PackageEntryTable* package_entry_table = module_entry->loader_data()->packages();
120 assert(package_entry_table != NULL, "Unexpected null package entry table");
121 return package_entry_table->lookup_only(pkg_symbol);
122 }
123
124 static PackageEntry* get_package_entry_by_name(Symbol* package,
125 Handle h_loader,
126 TRAPS) {
127 if (package != NULL) {
128 ResourceMark rm(THREAD);
129 if (Modules::verify_package_name(package->as_C_string())) {
130 PackageEntryTable* const package_entry_table =
131 get_package_entry_table(h_loader, CHECK_NULL);
132 assert(package_entry_table != NULL, "Unexpected null package entry table");
133 return package_entry_table->lookup_only(package);
134 }
135 }
136 return NULL;
137 }
138
139 bool Modules::is_package_defined(Symbol* package, Handle h_loader, TRAPS) {
140 PackageEntry* res = get_package_entry_by_name(package, h_loader, CHECK_false);
141 return res != NULL;
142 }
143
144 static void define_javabase_module(jobject module, jstring version,
145 jstring location, const char* const* packages,
146 jsize num_packages, TRAPS) {
147 ResourceMark rm(THREAD);
148
149 Handle module_handle(THREAD, JNIHandles::resolve(module));
150
151 // Obtain java.base's module version
152 const char* module_version = get_module_version(version);
153 TempNewSymbol version_symbol;
154 if (module_version != NULL) {
155 version_symbol = SymbolTable::new_symbol(module_version, CHECK);
156 } else {
157 version_symbol = NULL;
158 }
159
160 // Obtain java.base's location
161 const char* module_location = NULL;
162 TempNewSymbol location_symbol = NULL;
163 if (location != NULL) {
164 module_location =
165 java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(location));
166 if (module_location != NULL) {
167 location_symbol = SymbolTable::new_symbol(module_location, CHECK);
168 }
169 }
170
171
172 // Check that the packages are syntactically ok.
173 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
174 for (int x = 0; x < num_packages; x++) {
175 const char *package_name = packages[x];
176 if (!Modules::verify_package_name(package_name)) {
177 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
178 err_msg("Invalid package name: %s for module: " JAVA_BASE_NAME, package_name));
179 }
180 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);
181 pkg_list->append(pkg_symbol);
182 }
183
184 // Validate java_base's loader is the boot loader.
185 oop loader = java_lang_reflect_Module::loader(module_handle());
186 if (loader != NULL) {
187 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
188 "Class loader must be the boot class loader");
189 }
190 Handle h_loader(THREAD, loader);
191
192 // Ensure the boot loader's PackageEntryTable has been created
193 PackageEntryTable* package_table = get_package_entry_table(h_loader, CHECK);
194 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package_table");
195
196 // Ensure java.base's ModuleEntry has been created
197 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, "No ModuleEntry for " JAVA_BASE_NAME);
198
199 bool duplicate_javabase = false;
200 {
201 MutexLocker m1(Module_lock, THREAD);
202
203 if (ModuleEntryTable::javabase_defined()) {
204 duplicate_javabase = true;
205 } else {
206
207 // Verify that all java.base packages created during bootstrapping are in
208 // pkg_list. If any are not in pkg_list, than a non-java.base class was
209 // loaded erroneously pre java.base module definition.
210 package_table->verify_javabase_packages(pkg_list);
211
212 // loop through and add any new packages for java.base
213 PackageEntry* pkg;
214 for (int x = 0; x < pkg_list->length(); x++) {
215 // Some of java.base's packages were added early in bootstrapping, ignore duplicates.
216 if (package_table->lookup_only(pkg_list->at(x)) == NULL) {
217 pkg = package_table->locked_create_entry_or_null(pkg_list->at(x), ModuleEntryTable::javabase_moduleEntry());
218 assert(pkg != NULL, "Unable to create a " JAVA_BASE_NAME " package entry");
219 }
220 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
221 // the Symbol* that was created above for each package. The refcount was incremented
222 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
223 pkg_list->at(x)->decrement_refcount();
224 }
225
226 // Finish defining java.base's ModuleEntry
227 ModuleEntryTable::finalize_javabase(module_handle, version_symbol, location_symbol);
228 }
229 }
230 if (duplicate_javabase) {
231 THROW_MSG(vmSymbols::java_lang_InternalError(),
232 "Module " JAVA_BASE_NAME " is already defined");
233 }
234
235 // Only the thread that actually defined the base module will get here,
236 // so no locking is needed.
237
238 // Patch any previously loaded class's module field with java.base's java.lang.reflect.Module.
239 ModuleEntryTable::patch_javabase_entries(module_handle);
240
241 log_debug(modules)("define_javabase_module(): Definition of module: "
242 JAVA_BASE_NAME ", version: %s, location: %s, package #: %d",
243 module_version != NULL ? module_version : "NULL",
244 module_location != NULL ? module_location : "NULL",
245 pkg_list->length());
246
247 // packages defined to java.base
248 for (int x = 0; x < pkg_list->length(); x++) {
249 log_trace(modules)("define_javabase_module(): creation of package %s for module " JAVA_BASE_NAME,
250 (pkg_list->at(x))->as_C_string());
251 }
252 }
253
254 // Caller needs ResourceMark.
255 void throw_dup_pkg_exception(const char* module_name, PackageEntry* package, TRAPS) {
256 const char* package_name = package->name()->as_C_string();
257 if (package->module()->is_named()) {
258 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
259 err_msg("Package %s for module %s is already in another module, %s, defined to the class loader",
260 package_name, module_name, package->module()->name()->as_C_string()));
261 } else {
262 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
263 err_msg("Package %s for module %s is already in the unnamed module defined to the class loader",
264 package_name, module_name));
265 }
266 }
267
268 void Modules::define_module(jobject module, jstring version,
269 jstring location, const char* const* packages,
270 jsize num_packages, TRAPS) {
271 ResourceMark rm(THREAD);
272
273 if (module == NULL) {
274 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
275 }
276
277 if (num_packages < 0) {
278 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
279 "num_packages must be >= 0");
280 }
281
282 if (packages == NULL && num_packages > 0) {
283 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
284 "num_packages should be zero if packages is null");
285 }
286
287 Handle module_handle(THREAD, JNIHandles::resolve(module));
288 if (!java_lang_reflect_Module::is_instance(module_handle())) {
289 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
290 "module is not an instance of type java.lang.reflect.Module");
291 }
292
293 char* module_name = get_module_name(module_handle(), CHECK);
294 if (module_name == NULL) {
295 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
296 "Module name cannot be null");
297 }
298
299 // Special handling of java.base definition
300 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
301 define_javabase_module(module, version, location, packages, num_packages, CHECK);
302 return;
303 }
304
305 const char* module_version = get_module_version(version);
306
307 oop loader = java_lang_reflect_Module::loader(module_handle());
308 // Make sure loader is not the jdk.internal.reflect.DelegatingClassLoader.
309 if (loader != java_lang_ClassLoader::non_reflection_class_loader(loader)) {
310 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
311 "Class loader is an invalid delegating class loader");
312 }
313 Handle h_loader = Handle(THREAD, loader);
314
315 // Check that the list of packages has no duplicates and that the
316 // packages are syntactically ok.
317 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
318 for (int x = 0; x < num_packages; x++) {
319 const char* package_name = packages[x];
320 if (!verify_package_name(package_name)) {
321 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
322 err_msg("Invalid package name: %s for module: %s",
323 package_name, module_name));
324 }
325
326 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
327 if (!h_loader.is_null() &&
328 !SystemDictionary::is_platform_class_loader(h_loader()) &&
329 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&
330 (package_name[JAVAPKG_LEN] == '/' || package_name[JAVAPKG_LEN] == '\0'))) {
331 const char* class_loader_name = SystemDictionary::loader_name(h_loader());
332 size_t pkg_len = strlen(package_name);
333 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len);
334 strncpy(pkg_name, package_name, pkg_len);
335 StringUtils::replace_no_expand(pkg_name, "/", ".");
336 const char* msg_text1 = "Class loader (instance of): ";
337 const char* msg_text2 = " tried to define prohibited package name: ";
338 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;
339 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
340 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);
341 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);
342 }
343
344 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);
345 pkg_list->append(pkg_symbol);
346 }
347
348 ModuleEntryTable* module_table = get_module_entry_table(h_loader, CHECK);
349 assert(module_table != NULL, "module entry table shouldn't be null");
350
351 // Create symbol* entry for module name.
352 TempNewSymbol module_symbol = SymbolTable::new_symbol(module_name, CHECK);
353
354 bool dupl_modules = false;
355
356 // Create symbol* entry for module version.
357 TempNewSymbol version_symbol;
358 if (module_version != NULL) {
359 version_symbol = SymbolTable::new_symbol(module_version, CHECK);
360 } else {
361 version_symbol = NULL;
362 }
363
364 // Create symbol* entry for module location.
365 const char* module_location = NULL;
366 TempNewSymbol location_symbol = NULL;
367 if (location != NULL) {
368 module_location =
369 java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(location));
370 if (module_location != NULL) {
371 location_symbol = SymbolTable::new_symbol(module_location, CHECK);
372 }
373 }
374
375 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data_or_null(h_loader());
376 assert(loader_data != NULL, "class loader data shouldn't be null");
377
378 PackageEntryTable* package_table = NULL;
379 PackageEntry* existing_pkg = NULL;
380 {
381 MutexLocker ml(Module_lock, THREAD);
382
383 if (num_packages > 0) {
384 package_table = get_package_entry_table(h_loader, CHECK);
385 assert(package_table != NULL, "Missing package_table");
386
387 // Check that none of the packages exist in the class loader's package table.
388 for (int x = 0; x < pkg_list->length(); x++) {
389 existing_pkg = package_table->lookup_only(pkg_list->at(x));
390 if (existing_pkg != NULL) {
391 // This could be because the module was already defined. If so,
392 // report that error instead of the package error.
393 if (module_table->lookup_only(module_symbol) != NULL) {
394 dupl_modules = true;
395 }
396 break;
397 }
398 }
399 } // if (num_packages > 0)...
400
401 // Add the module and its packages.
402 if (!dupl_modules && existing_pkg == NULL) {
403 // Create the entry for this module in the class loader's module entry table.
404 ModuleEntry* module_entry = module_table->locked_create_entry_or_null(module_handle, module_symbol,
405 version_symbol, location_symbol, loader_data);
406
407 if (module_entry == NULL) {
408 dupl_modules = true;
409 } else {
410 // Add the packages.
411 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package table");
412 PackageEntry* pkg;
413 for (int y = 0; y < pkg_list->length(); y++) {
414 pkg = package_table->locked_create_entry_or_null(pkg_list->at(y), module_entry);
415 assert(pkg != NULL, "Unable to create a module's package entry");
416
417 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
418 // the Symbol* that was created above for each package. The refcount was incremented
419 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
420 pkg_list->at(y)->decrement_refcount();
421 }
422
423 // Store pointer to ModuleEntry record in java.lang.reflect.Module object.
424 java_lang_reflect_Module::set_module_entry(module_handle(), module_entry);
425 }
426 }
427 } // Release the lock
428
429 // any errors ?
430 if (dupl_modules) {
431 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
432 err_msg("Module %s is already defined", module_name));
433 } else if (existing_pkg != NULL) {
434 throw_dup_pkg_exception(module_name, existing_pkg, CHECK);
435 }
436
437 if (log_is_enabled(Debug, modules)) {
438 outputStream* logst = Log(modules)::debug_stream();
439 logst->print("define_module(): creation of module: %s, version: %s, location: %s, ",
440 module_name, module_version != NULL ? module_version : "NULL",
441 module_location != NULL ? module_location : "NULL");
442 loader_data->print_value_on(logst);
443 logst->print_cr(", package #: %d", pkg_list->length());
444 for (int y = 0; y < pkg_list->length(); y++) {
445 log_trace(modules)("define_module(): creation of package %s for module %s",
446 (pkg_list->at(y))->as_C_string(), module_name);
447 }
448 }
449
450 // If the module is defined to the boot loader and an exploded build is being
451 // used, prepend <java.home>/modules/modules_name, if it exists, to the system boot class path.
452 if (loader == NULL &&
453 !Universe::is_module_initialized() &&
454 !ClassLoader::has_jrt_entry()) {
455 ClassLoader::add_to_exploded_build_list(module_symbol, CHECK);
456 }
457 }
458
459 void Modules::set_bootloader_unnamed_module(jobject module, TRAPS) {
460 ResourceMark rm(THREAD);
461
462 if (module == NULL) {
463 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
464 }
465 Handle module_handle(THREAD, JNIHandles::resolve(module));
466 if (!java_lang_reflect_Module::is_instance(module_handle())) {
467 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
468 "module is not an instance of type java.lang.reflect.Module");
469 }
470
471 // Ensure that this is an unnamed module
472 oop name = java_lang_reflect_Module::name(module_handle());
473 if (name != NULL) {
474 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
475 "boot loader's unnamed module's java.lang.reflect.Module has a name");
476 }
477
478 // Validate java_base's loader is the boot loader.
479 oop loader = java_lang_reflect_Module::loader(module_handle());
480 if (loader != NULL) {
481 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
482 "Class loader must be the boot class loader");
483 }
484 Handle h_loader(THREAD, loader);
485
486 log_debug(modules)("set_bootloader_unnamed_module(): recording unnamed module for boot loader");
487
488 // Set java.lang.Module for the boot loader's unnamed module
489 ModuleEntry* unnamed_module = get_unnamed_module(h_loader, CHECK);
490 assert(unnamed_module != NULL, "boot loader's unnamed ModuleEntry not defined");
491 unnamed_module->set_module(ClassLoaderData::the_null_class_loader_data()->add_handle(module_handle));
492 // Store pointer to the ModuleEntry in the unnamed module's java.lang.reflect.Module object.
493 java_lang_reflect_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 are exported by default.
512 if (!from_module_entry->is_named()) 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(modules)("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(modules)("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(modules)("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_reflect_Module::is_instance(module), "module is not an instance of type java.lang.reflect.Module");
624
625 if (log_is_enabled(Debug, modules)) {
626 ResourceMark rm(THREAD);
627 outputStream* logst = Log(modules)::debug_stream();
628 Klass* klass = java_lang_Class::as_Klass(mirror);
629 oop module_name = java_lang_reflect_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(modules)("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(modules)("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 }