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/access.inline.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/handles.inline.hpp"
45 #include "runtime/javaCalls.hpp"
46 #include "runtime/reflection.hpp"
47 #include "utilities/stringUtils.hpp"
48 #include "utilities/utf8.hpp"
49
50 static bool verify_module_name(const char *module_name) {
51 if (module_name == NULL) return false;
52 int len = (int)strlen(module_name);
53 return (len > 0 && len <= Symbol::max_length());
54 }
55
56 bool Modules::verify_package_name(const char* package_name) {
57 if (package_name == NULL) return false;
58 int len = (int)strlen(package_name);
59 return (len > 0 && len <= Symbol::max_length() &&
60 UTF8::is_legal_utf8((const unsigned char *)package_name, len, false) &&
61 ClassFileParser::verify_unqualified_name(package_name, len,
62 ClassFileParser::LegalClass));
63 }
64
65 static char* get_module_name(oop module, TRAPS) {
66 oop name_oop = java_lang_Module::name(module);
67 if (name_oop == NULL) {
68 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(), "Null module name");
69 }
70 char* module_name = java_lang_String::as_utf8_string(name_oop);
71 if (!verify_module_name(module_name)) {
72 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
73 err_msg("Invalid module name: %s",
74 module_name != NULL ? module_name : "NULL"));
75 }
76 return module_name;
77 }
78
79 static const char* get_module_version(jstring version) {
80 if (version == NULL) {
81 return NULL;
82 }
83 return java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(version));
84 }
85
86 static ModuleEntryTable* get_module_entry_table(Handle h_loader, TRAPS) {
87 // This code can be called during start-up, before the classLoader's classLoader data got
88 // created. So, call register_loader() to make sure the classLoader data gets created.
89 ClassLoaderData *loader_cld = SystemDictionary::register_loader(h_loader, CHECK_NULL);
90 return loader_cld->modules();
91 }
92
93 static PackageEntryTable* get_package_entry_table(Handle h_loader, TRAPS) {
94 // This code can be called during start-up, before the classLoader's classLoader data got
95 // created. So, call register_loader() to make sure the classLoader data gets created.
96 ClassLoaderData *loader_cld = SystemDictionary::register_loader(h_loader, CHECK_NULL);
97 return loader_cld->packages();
98 }
99
100 static ModuleEntry* get_module_entry(jobject module, TRAPS) {
101 Handle module_h(THREAD, JNIHandles::resolve(module));
102 if (!java_lang_Module::is_instance(module_h())) {
103 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
104 "module is not an instance of type java.lang.Module");
105 }
106 return java_lang_Module::module_entry(module_h(), CHECK_NULL);
107 }
108
109 static PackageEntry* get_package_entry(ModuleEntry* module_entry, const char* package_name, TRAPS) {
110 ResourceMark rm(THREAD);
111 if (package_name == NULL) return NULL;
112 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(package_name, CHECK_NULL);
113 PackageEntryTable* package_entry_table = module_entry->loader_data()->packages();
114 assert(package_entry_table != NULL, "Unexpected null package entry table");
115 return package_entry_table->lookup_only(pkg_symbol);
116 }
117
118 static PackageEntry* get_package_entry_by_name(Symbol* package,
119 Handle h_loader,
120 TRAPS) {
121 if (package != NULL) {
122 ResourceMark rm(THREAD);
123 if (Modules::verify_package_name(package->as_C_string())) {
124 PackageEntryTable* const package_entry_table =
125 get_package_entry_table(h_loader, CHECK_NULL);
126 assert(package_entry_table != NULL, "Unexpected null package entry table");
127 return package_entry_table->lookup_only(package);
128 }
129 }
130 return NULL;
131 }
132
133 bool Modules::is_package_defined(Symbol* package, Handle h_loader, TRAPS) {
134 PackageEntry* res = get_package_entry_by_name(package, h_loader, CHECK_false);
135 return res != NULL;
136 }
137
138 static void define_javabase_module(jobject module, jstring version,
139 jstring location, const char* const* packages,
140 jsize num_packages, TRAPS) {
141 ResourceMark rm(THREAD);
142
143 Handle module_handle(THREAD, JNIHandles::resolve(module));
144
145 // Obtain java.base's module version
146 const char* module_version = get_module_version(version);
147 TempNewSymbol version_symbol;
148 if (module_version != NULL) {
149 version_symbol = SymbolTable::new_symbol(module_version, CHECK);
150 } else {
151 version_symbol = NULL;
152 }
153
154 // Obtain java.base's location
155 const char* module_location = NULL;
156 TempNewSymbol location_symbol = NULL;
157 if (location != NULL) {
158 module_location =
159 java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(location));
160 if (module_location != NULL) {
161 location_symbol = SymbolTable::new_symbol(module_location, CHECK);
162 }
163 }
164
165
166 // Check that the packages are syntactically ok.
167 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
168 for (int x = 0; x < num_packages; x++) {
169 const char *package_name = packages[x];
170 if (!Modules::verify_package_name(package_name)) {
171 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
172 err_msg("Invalid package name: %s for module: " JAVA_BASE_NAME, package_name));
173 }
174 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);
175 pkg_list->append(pkg_symbol);
176 }
177
178 // Validate java_base's loader is the boot loader.
179 oop loader = java_lang_Module::loader(module_handle());
180 if (loader != NULL) {
181 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
182 "Class loader must be the boot class loader");
183 }
184 Handle h_loader(THREAD, loader);
185
186 // Ensure the boot loader's PackageEntryTable has been created
187 PackageEntryTable* package_table = get_package_entry_table(h_loader, CHECK);
188 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package_table");
189
190 // Ensure java.base's ModuleEntry has been created
191 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, "No ModuleEntry for " JAVA_BASE_NAME);
192
193 bool duplicate_javabase = false;
194 {
195 MutexLocker m1(Module_lock, THREAD);
196
197 if (ModuleEntryTable::javabase_defined()) {
198 duplicate_javabase = true;
199 } else {
200
201 // Verify that all java.base packages created during bootstrapping are in
202 // pkg_list. If any are not in pkg_list, than a non-java.base class was
203 // loaded erroneously pre java.base module definition.
204 package_table->verify_javabase_packages(pkg_list);
205
206 // loop through and add any new packages for java.base
207 PackageEntry* pkg;
208 for (int x = 0; x < pkg_list->length(); x++) {
209 // Some of java.base's packages were added early in bootstrapping, ignore duplicates.
210 if (package_table->lookup_only(pkg_list->at(x)) == NULL) {
211 pkg = package_table->locked_create_entry_or_null(pkg_list->at(x), ModuleEntryTable::javabase_moduleEntry());
212 assert(pkg != NULL, "Unable to create a " JAVA_BASE_NAME " package entry");
213 }
214 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
215 // the Symbol* that was created above for each package. The refcount was incremented
216 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
217 pkg_list->at(x)->decrement_refcount();
218 }
219
220 // Finish defining java.base's ModuleEntry
221 ModuleEntryTable::finalize_javabase(module_handle, version_symbol, location_symbol);
222 }
223 }
224 if (duplicate_javabase) {
225 THROW_MSG(vmSymbols::java_lang_InternalError(),
226 "Module " JAVA_BASE_NAME " is already defined");
227 }
228
229 // Only the thread that actually defined the base module will get here,
230 // so no locking is needed.
231
232 // Patch any previously loaded class's module field with java.base's java.lang.Module.
233 ModuleEntryTable::patch_javabase_entries(module_handle);
234
235 log_debug(modules)("define_javabase_module(): Definition of module: "
236 JAVA_BASE_NAME ", version: %s, location: %s, package #: %d",
237 module_version != NULL ? module_version : "NULL",
238 module_location != NULL ? module_location : "NULL",
239 pkg_list->length());
240
241 // packages defined to java.base
242 if (log_is_enabled(Trace, modules)) {
243 for (int x = 0; x < pkg_list->length(); x++) {
244 log_trace(modules)("define_javabase_module(): creation of package %s for module " JAVA_BASE_NAME,
245 (pkg_list->at(x))->as_C_string());
246 }
247 }
248 }
249
250 // Caller needs ResourceMark.
251 void throw_dup_pkg_exception(const char* module_name, PackageEntry* package, TRAPS) {
252 const char* package_name = package->name()->as_C_string();
253 if (package->module()->is_named()) {
254 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
255 err_msg("Package %s for module %s is already in another module, %s, defined to the class loader",
256 package_name, module_name, package->module()->name()->as_C_string()));
257 } else {
258 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
259 err_msg("Package %s for module %s is already in the unnamed module defined to the class loader",
260 package_name, module_name));
261 }
262 }
263
264 void Modules::define_module(jobject module, jboolean is_open, jstring version,
265 jstring location, const char* const* packages,
266 jsize num_packages, TRAPS) {
267 ResourceMark rm(THREAD);
268
269 if (module == NULL) {
270 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
271 }
272
273 if (num_packages < 0) {
274 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
275 "num_packages must be >= 0");
276 }
277
278 if (packages == NULL && num_packages > 0) {
279 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
280 "num_packages should be zero if packages is null");
281 }
282
283 Handle module_handle(THREAD, JNIHandles::resolve(module));
284 if (!java_lang_Module::is_instance(module_handle())) {
285 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
286 "module is not an instance of type java.lang.Module");
287 }
288
289 char* module_name = get_module_name(module_handle(), CHECK);
290 if (module_name == NULL) {
291 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
292 "Module name cannot be null");
293 }
294
295 // Special handling of java.base definition
296 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
297 assert(is_open == JNI_FALSE, "java.base module cannot be open");
298 define_javabase_module(module, version, location, packages, num_packages, CHECK);
299 return;
300 }
301
302 const char* module_version = get_module_version(version);
303
304 oop loader = java_lang_Module::loader(module_handle());
305 // Make sure loader is not the jdk.internal.reflect.DelegatingClassLoader.
306 if (loader != java_lang_ClassLoader::non_reflection_class_loader(loader)) {
307 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
308 "Class loader is an invalid delegating class loader");
309 }
310 Handle h_loader = Handle(THREAD, loader);
311
312 // Check that the list of packages has no duplicates and that the
313 // packages are syntactically ok.
314 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
315 for (int x = 0; x < num_packages; x++) {
316 const char* package_name = packages[x];
317 if (!verify_package_name(package_name)) {
318 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
319 err_msg("Invalid package name: %s for module: %s",
320 package_name, module_name));
321 }
322
323 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
324 if (!h_loader.is_null() &&
325 !SystemDictionary::is_platform_class_loader(h_loader()) &&
326 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&
327 (package_name[JAVAPKG_LEN] == '/' || package_name[JAVAPKG_LEN] == '\0'))) {
328 const char* class_loader_name = SystemDictionary::loader_name(h_loader());
329 size_t pkg_len = strlen(package_name);
330 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len);
331 strncpy(pkg_name, package_name, pkg_len);
332 StringUtils::replace_no_expand(pkg_name, "/", ".");
333 const char* msg_text1 = "Class loader (instance of): ";
334 const char* msg_text2 = " tried to define prohibited package name: ";
335 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;
336 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
337 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);
338 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);
339 }
340
341 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);
342 pkg_list->append(pkg_symbol);
343 }
344
345 ModuleEntryTable* module_table = get_module_entry_table(h_loader, CHECK);
346 assert(module_table != NULL, "module entry table shouldn't be null");
347
348 // Create symbol* entry for module name.
349 TempNewSymbol module_symbol = SymbolTable::new_symbol(module_name, CHECK);
350
351 bool dupl_modules = false;
352
353 // Create symbol* entry for module version.
354 TempNewSymbol version_symbol;
355 if (module_version != NULL) {
356 version_symbol = SymbolTable::new_symbol(module_version, CHECK);
357 } else {
358 version_symbol = NULL;
359 }
360
361 // Create symbol* entry for module location.
362 const char* module_location = NULL;
363 TempNewSymbol location_symbol = NULL;
364 if (location != NULL) {
365 module_location =
366 java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(location));
367 if (module_location != NULL) {
368 location_symbol = SymbolTable::new_symbol(module_location, CHECK);
369 }
370 }
371
372 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data_or_null(h_loader());
373 assert(loader_data != NULL, "class loader data shouldn't be null");
374
375 PackageEntryTable* package_table = NULL;
376 PackageEntry* existing_pkg = NULL;
377 {
378 MutexLocker ml(Module_lock, THREAD);
379
380 if (num_packages > 0) {
381 package_table = get_package_entry_table(h_loader, CHECK);
382 assert(package_table != NULL, "Missing package_table");
383
384 // Check that none of the packages exist in the class loader's package table.
385 for (int x = 0; x < pkg_list->length(); x++) {
386 existing_pkg = package_table->lookup_only(pkg_list->at(x));
387 if (existing_pkg != NULL) {
388 // This could be because the module was already defined. If so,
389 // report that error instead of the package error.
390 if (module_table->lookup_only(module_symbol) != NULL) {
391 dupl_modules = true;
392 }
393 break;
394 }
395 }
396 } // if (num_packages > 0)...
397
398 // Add the module and its packages.
399 if (!dupl_modules && existing_pkg == NULL) {
400 // Create the entry for this module in the class loader's module entry table.
401 ModuleEntry* module_entry = module_table->locked_create_entry_or_null(module_handle,
402 (is_open == JNI_TRUE), module_symbol,
403 version_symbol, location_symbol, loader_data);
404
405 if (module_entry == NULL) {
406 dupl_modules = true;
407 } else {
408 // Add the packages.
409 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package table");
410 PackageEntry* pkg;
411 for (int y = 0; y < pkg_list->length(); y++) {
412 pkg = package_table->locked_create_entry_or_null(pkg_list->at(y), module_entry);
413 assert(pkg != NULL, "Unable to create a module's package entry");
414
415 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
416 // the Symbol* that was created above for each package. The refcount was incremented
417 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
418 pkg_list->at(y)->decrement_refcount();
419 }
420
421 // Store pointer to ModuleEntry record in java.lang.Module object.
422 java_lang_Module::set_module_entry(module_handle(), module_entry);
423 }
424 }
425 } // Release the lock
426
427 // any errors ?
428 if (dupl_modules) {
429 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
430 err_msg("Module %s is already defined", module_name));
431 } else if (existing_pkg != NULL) {
432 throw_dup_pkg_exception(module_name, existing_pkg, CHECK);
433 }
434
435 if (log_is_enabled(Debug, modules)) {
436 outputStream* logst = Log(modules)::debug_stream();
437 logst->print("define_module(): creation of module: %s, version: %s, location: %s, ",
438 module_name, module_version != NULL ? module_version : "NULL",
439 module_location != NULL ? module_location : "NULL");
440 loader_data->print_value_on(logst);
441 logst->print_cr(", package #: %d", pkg_list->length());
442 for (int y = 0; y < pkg_list->length(); y++) {
443 log_trace(modules)("define_module(): creation of package %s for module %s",
444 (pkg_list->at(y))->as_C_string(), module_name);
445 }
446 }
447
448 // If the module is defined to the boot loader and an exploded build is being
449 // used, prepend <java.home>/modules/modules_name, if it exists, to the system boot class path.
450 if (loader == NULL &&
451 !Universe::is_module_initialized() &&
452 !ClassLoader::has_jrt_entry()) {
453 ClassLoader::add_to_exploded_build_list(module_symbol, CHECK);
454 }
455 }
456
457 void Modules::set_bootloader_unnamed_module(jobject module, TRAPS) {
458 ResourceMark rm(THREAD);
459
460 if (module == NULL) {
461 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
462 }
463 Handle module_handle(THREAD, JNIHandles::resolve(module));
464 if (!java_lang_Module::is_instance(module_handle())) {
465 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
466 "module is not an instance of type java.lang.Module");
467 }
468
469 // Ensure that this is an unnamed module
470 oop name = java_lang_Module::name(module_handle());
471 if (name != NULL) {
472 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
473 "boot loader's unnamed module's java.lang.Module has a name");
474 }
475
476 // Validate java_base's loader is the boot loader.
477 oop loader = java_lang_Module::loader(module_handle());
478 if (loader != NULL) {
479 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
480 "Class loader must be the boot class loader");
481 }
482 Handle h_loader(THREAD, loader);
483
484 log_debug(modules)("set_bootloader_unnamed_module(): recording unnamed module for boot loader");
485
486 // Set java.lang.Module for the boot loader's unnamed module
487 ClassLoaderData* boot_loader_data = ClassLoaderData::the_null_class_loader_data();
488 ModuleEntry* unnamed_module = boot_loader_data->unnamed_module();
489 assert(unnamed_module != NULL, "boot loader's unnamed ModuleEntry not defined");
490 unnamed_module->set_module(boot_loader_data->add_handle(module_handle));
491 // Store pointer to the ModuleEntry in the unnamed module's java.lang.Module object.
492 java_lang_Module::set_module_entry(module_handle(), unnamed_module);
493 }
494
495 void Modules::add_module_exports(jobject from_module, const char* package_name, jobject to_module, TRAPS) {
496 if (package_name == NULL) {
497 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
498 "package is null");
499 }
500 if (from_module == NULL) {
501 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
502 "from_module is null");
503 }
504 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
505 if (from_module_entry == NULL) {
506 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
507 "from_module cannot be found");
508 }
509
510 // All packages in unnamed and open modules are exported by default.
511 if (!from_module_entry->is_named() || from_module_entry->is_open()) return;
512
513 ModuleEntry* to_module_entry;
514 if (to_module == NULL) {
515 to_module_entry = NULL; // It's an unqualified export.
516 } else {
517 to_module_entry = get_module_entry(to_module, CHECK);
518 if (to_module_entry == NULL) {
519 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
520 "to_module is invalid");
521 }
522 }
523
524 PackageEntry *package_entry = get_package_entry(from_module_entry, package_name, CHECK);
525 ResourceMark rm(THREAD);
526 if (package_entry == NULL) {
527 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
528 err_msg("Package %s not found in from_module %s",
529 package_name != NULL ? package_name : "",
530 from_module_entry->name()->as_C_string()));
531 }
532 if (package_entry->module() != from_module_entry) {
533 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
534 err_msg("Package: %s found in module %s, not in from_module: %s",
535 package_entry->name()->as_C_string(),
536 package_entry->module()->name()->as_C_string(),
537 from_module_entry->name()->as_C_string()));
538 }
539
540 log_debug(modules)("add_module_exports(): package %s in module %s is exported to module %s",
541 package_entry->name()->as_C_string(),
542 from_module_entry->name()->as_C_string(),
543 to_module_entry == NULL ? "NULL" :
544 to_module_entry->is_named() ?
545 to_module_entry->name()->as_C_string() : UNNAMED_MODULE);
546
547 // Do nothing if modules are the same.
548 if (from_module_entry != to_module_entry) {
549 package_entry->set_exported(to_module_entry);
550 }
551 }
552
553
554 void Modules::add_module_exports_qualified(jobject from_module, const char* package,
555 jobject to_module, TRAPS) {
556 if (to_module == NULL) {
557 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
558 "to_module is null");
559 }
560 add_module_exports(from_module, package, to_module, CHECK);
561 }
562
563 void Modules::add_reads_module(jobject from_module, jobject to_module, TRAPS) {
564 if (from_module == NULL) {
565 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
566 "from_module is null");
567 }
568
569 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
570 if (from_module_entry == NULL) {
571 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
572 "from_module is not valid");
573 }
574
575 ModuleEntry* to_module_entry;
576 if (to_module != NULL) {
577 to_module_entry = get_module_entry(to_module, CHECK);
578 if (to_module_entry == NULL) {
579 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
580 "to_module is invalid");
581 }
582 } else {
583 to_module_entry = NULL;
584 }
585
586 ResourceMark rm(THREAD);
587 log_debug(modules)("add_reads_module(): Adding read from module %s to module %s",
588 from_module_entry->is_named() ?
589 from_module_entry->name()->as_C_string() : UNNAMED_MODULE,
590 to_module_entry == NULL ? "all unnamed" :
591 (to_module_entry->is_named() ?
592 to_module_entry->name()->as_C_string() : UNNAMED_MODULE));
593
594 // if modules are the same or if from_module is unnamed then no need to add the read.
595 if (from_module_entry != to_module_entry && from_module_entry->is_named()) {
596 from_module_entry->add_read(to_module_entry);
597 }
598 }
599
600 // This method is called by JFR and JNI.
601 jobject Modules::get_module(jclass clazz, TRAPS) {
602 assert(ModuleEntryTable::javabase_defined(),
603 "Attempt to call get_module before " JAVA_BASE_NAME " is defined");
604
605 if (clazz == NULL) {
606 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
607 "class is null", JNI_FALSE);
608 }
609 oop mirror = JNIHandles::resolve_non_null(clazz);
610 if (mirror == NULL) {
611 log_debug(modules)("get_module(): no mirror, returning NULL");
612 return NULL;
613 }
614 if (!java_lang_Class::is_instance(mirror)) {
615 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
616 "Invalid class", JNI_FALSE);
617 }
618
619 oop module = java_lang_Class::module(mirror);
620
621 assert(module != NULL, "java.lang.Class module field not set");
622 assert(java_lang_Module::is_instance(module), "module is not an instance of type java.lang.Module");
623
624 if (log_is_enabled(Debug, modules)) {
625 ResourceMark rm(THREAD);
626 outputStream* logst = Log(modules)::debug_stream();
627 Klass* klass = java_lang_Class::as_Klass(mirror);
628 oop module_name = java_lang_Module::name(module);
629 if (module_name != NULL) {
630 logst->print("get_module(): module ");
631 java_lang_String::print(module_name, tty);
632 } else {
633 logst->print("get_module(): Unamed Module");
634 }
635 if (klass != NULL) {
636 logst->print_cr(" for class %s", klass->external_name());
637 } else {
638 logst->print_cr(" for primitive class");
639 }
640 }
641
642 return JNIHandles::make_local(THREAD, module);
643 }
644
645 jobject Modules::get_named_module(Handle h_loader, const char* package_name, TRAPS) {
646 assert(ModuleEntryTable::javabase_defined(),
647 "Attempt to call get_named_module before " JAVA_BASE_NAME " is defined");
648 assert(h_loader.is_null() || java_lang_ClassLoader::is_subclass(h_loader->klass()),
649 "Class loader is not a subclass of java.lang.ClassLoader");
650 assert(package_name != NULL, "the package_name should not be NULL");
651
652 if (strlen(package_name) == 0) {
653 return NULL;
654 }
655 TempNewSymbol package_sym = SymbolTable::new_symbol(package_name, CHECK_NULL);
656 const PackageEntry* const pkg_entry =
657 get_package_entry_by_name(package_sym, h_loader, THREAD);
658 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
659
660 if (module_entry != NULL && module_entry->module() != NULL && module_entry->is_named()) {
661 return JNIHandles::make_local(THREAD, JNIHandles::resolve(module_entry->module()));
662 }
663 return NULL;
664 }
665
666
667 // This method is called by JFR and by the above method.
668 jobject Modules::get_module(Symbol* package_name, Handle h_loader, TRAPS) {
669 const PackageEntry* const pkg_entry =
670 get_package_entry_by_name(package_name, h_loader, THREAD);
671 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
672
673 if (module_entry != NULL &&
674 module_entry->module() != NULL) {
675 return JNIHandles::make_local(THREAD, JNIHandles::resolve(module_entry->module()));
676 }
677
678 return NULL;
679 }
680
681 void Modules::add_module_package(jobject module, const char* package_name, TRAPS) {
682 ResourceMark rm(THREAD);
683
684 if (module == NULL) {
685 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
686 "module is null");
687 }
688 if (package_name == NULL) {
689 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
690 "package is null");
691 }
692 ModuleEntry* module_entry = get_module_entry(module, CHECK);
693 if (module_entry == NULL) {
694 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
695 "module is invalid");
696 }
697 if (!module_entry->is_named()) {
698 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
699 "module cannot be an unnamed module");
700 }
701 if (!verify_package_name(package_name)) {
702 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
703 err_msg("Invalid package name: %s", package_name));
704 }
705
706 ClassLoaderData *loader_data = module_entry->loader_data();
707
708 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
709 if (!loader_data->is_the_null_class_loader_data() &&
710 !loader_data->is_platform_class_loader_data() &&
711 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&
712 (package_name[JAVAPKG_LEN] == '/' || package_name[JAVAPKG_LEN] == '\0'))) {
713 const char* class_loader_name = SystemDictionary::loader_name(loader_data);
714 size_t pkg_len = strlen(package_name);
715 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len);
716 strncpy(pkg_name, package_name, pkg_len);
717 StringUtils::replace_no_expand(pkg_name, "/", ".");
718 const char* msg_text1 = "Class loader (instance of): ";
719 const char* msg_text2 = " tried to define prohibited package name: ";
720 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;
721 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
722 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);
723 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);
724 }
725
726 log_debug(modules)("add_module_package(): Adding package %s to module %s",
727 package_name, module_entry->name()->as_C_string());
728
729 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);
730 PackageEntryTable* package_table = loader_data->packages();
731 assert(package_table != NULL, "Missing package_table");
732
733 PackageEntry* existing_pkg = NULL;
734 {
735 MutexLocker ml(Module_lock, THREAD);
736
737 // Check that the package does not exist in the class loader's package table.
738 existing_pkg = package_table->lookup_only(pkg_symbol);
739 if (existing_pkg == NULL) {
740 PackageEntry* pkg = package_table->locked_create_entry_or_null(pkg_symbol, module_entry);
741 assert(pkg != NULL, "Unable to create a module's package entry");
742 }
743 }
744 if (existing_pkg != NULL) {
745 throw_dup_pkg_exception(module_entry->name()->as_C_string(), existing_pkg, CHECK);
746 }
747 }
748
749 // Export package in module to all unnamed modules.
750 void Modules::add_module_exports_to_all_unnamed(jobject module, const char* package_name, TRAPS) {
751 if (module == NULL) {
752 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
753 "module is null");
754 }
755 if (package_name == NULL) {
756 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
757 "package is null");
758 }
759 ModuleEntry* module_entry = get_module_entry(module, CHECK);
760 if (module_entry == NULL) {
761 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
762 "module is invalid");
763 }
764
765 if (module_entry->is_named()) { // No-op for unnamed module.
766 PackageEntry *package_entry = get_package_entry(module_entry, package_name, CHECK);
767 ResourceMark rm(THREAD);
768 if (package_entry == NULL) {
769 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
770 err_msg("Package %s not found in module %s",
771 package_name != NULL ? package_name : "",
772 module_entry->name()->as_C_string()));
773 }
774 if (package_entry->module() != module_entry) {
775 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
776 err_msg("Package: %s found in module %s, not in module: %s",
777 package_entry->name()->as_C_string(),
778 package_entry->module()->name()->as_C_string(),
779 module_entry->name()->as_C_string()));
780 }
781
782 log_debug(modules)("add_module_exports_to_all_unnamed(): package %s in module"
783 " %s is exported to all unnamed modules",
784 package_entry->name()->as_C_string(),
785 module_entry->name()->as_C_string());
786
787 // Mark package as exported to all unnamed modules.
788 package_entry->set_is_exported_allUnnamed();
789 }
790 }