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 "prims/jvm.h"
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_info(module, load)(JAVA_BASE_NAME " location: %s",
236 module_location != NULL ? module_location : "NULL");
237 log_debug(module)("define_javabase_module(): Definition of module: "
238 JAVA_BASE_NAME ", version: %s, location: %s, package #: %d",
239 module_version != NULL ? module_version : "NULL",
240 module_location != NULL ? module_location : "NULL",
241 pkg_list->length());
242
243 // packages defined to java.base
244 if (log_is_enabled(Trace, module)) {
245 for (int x = 0; x < pkg_list->length(); x++) {
246 log_trace(module)("define_javabase_module(): creation of package %s for module " JAVA_BASE_NAME,
247 (pkg_list->at(x))->as_C_string());
248 }
249 }
250 }
251
252 // Caller needs ResourceMark.
253 void throw_dup_pkg_exception(const char* module_name, PackageEntry* package, TRAPS) {
254 const char* package_name = package->name()->as_C_string();
255 if (package->module()->is_named()) {
256 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
257 err_msg("Package %s for module %s is already in another module, %s, defined to the class loader",
258 package_name, module_name, package->module()->name()->as_C_string()));
259 } else {
260 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
261 err_msg("Package %s for module %s is already in the unnamed module defined to the class loader",
262 package_name, module_name));
263 }
264 }
265
266 void Modules::define_module(jobject module, jboolean is_open, jstring version,
267 jstring location, const char* const* packages,
268 jsize num_packages, TRAPS) {
269 ResourceMark rm(THREAD);
270
271 if (module == NULL) {
272 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
273 }
274
275 if (num_packages < 0) {
276 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
277 "num_packages must be >= 0");
278 }
279
280 if (packages == NULL && num_packages > 0) {
281 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
282 "num_packages should be zero if packages is null");
283 }
284
285 Handle module_handle(THREAD, JNIHandles::resolve(module));
286 if (!java_lang_Module::is_instance(module_handle())) {
287 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
288 "module is not an instance of type java.lang.Module");
289 }
290
291 char* module_name = get_module_name(module_handle(), CHECK);
292 if (module_name == NULL) {
293 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
294 "Module name cannot be null");
295 }
296
297 // Special handling of java.base definition
298 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
299 assert(is_open == JNI_FALSE, "java.base module cannot be open");
300 define_javabase_module(module, version, location, packages, num_packages, CHECK);
301 return;
302 }
303
304 const char* module_version = get_module_version(version);
305
306 oop loader = java_lang_Module::loader(module_handle());
307 // Make sure loader is not the jdk.internal.reflect.DelegatingClassLoader.
308 if (loader != java_lang_ClassLoader::non_reflection_class_loader(loader)) {
309 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
310 "Class loader is an invalid delegating class loader");
311 }
312 Handle h_loader = Handle(THREAD, loader);
313
314 // Check that the list of packages has no duplicates and that the
315 // packages are syntactically ok.
316 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
317 for (int x = 0; x < num_packages; x++) {
318 const char* package_name = packages[x];
319 if (!verify_package_name(package_name)) {
320 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
321 err_msg("Invalid package name: %s for module: %s",
322 package_name, module_name));
323 }
324
325 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
326 if (!h_loader.is_null() &&
327 !SystemDictionary::is_platform_class_loader(h_loader()) &&
328 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&
329 (package_name[JAVAPKG_LEN] == '/' || package_name[JAVAPKG_LEN] == '\0'))) {
330 const char* class_loader_name = SystemDictionary::loader_name(h_loader());
331 size_t pkg_len = strlen(package_name);
332 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len);
333 strncpy(pkg_name, package_name, pkg_len);
334 StringUtils::replace_no_expand(pkg_name, "/", ".");
335 const char* msg_text1 = "Class loader (instance of): ";
336 const char* msg_text2 = " tried to define prohibited package name: ";
337 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;
338 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
339 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);
340 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);
341 }
342
343 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);
344 pkg_list->append(pkg_symbol);
345 }
346
347 ModuleEntryTable* module_table = get_module_entry_table(h_loader, CHECK);
348 assert(module_table != NULL, "module entry table shouldn't be null");
349
350 // Create symbol* entry for module name.
351 TempNewSymbol module_symbol = SymbolTable::new_symbol(module_name, CHECK);
352
353 bool dupl_modules = false;
354
355 // Create symbol* entry for module version.
356 TempNewSymbol version_symbol;
357 if (module_version != NULL) {
358 version_symbol = SymbolTable::new_symbol(module_version, CHECK);
359 } else {
360 version_symbol = NULL;
361 }
362
363 // Create symbol* entry for module location.
364 const char* module_location = NULL;
365 TempNewSymbol location_symbol = NULL;
366 if (location != NULL) {
367 module_location =
368 java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(location));
369 if (module_location != NULL) {
370 location_symbol = SymbolTable::new_symbol(module_location, CHECK);
371 }
372 }
373
374 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data_or_null(h_loader());
375 assert(loader_data != NULL, "class loader data shouldn't be null");
376
377 PackageEntryTable* package_table = NULL;
378 PackageEntry* existing_pkg = NULL;
379 {
380 MutexLocker ml(Module_lock, THREAD);
381
382 if (num_packages > 0) {
383 package_table = get_package_entry_table(h_loader, CHECK);
384 assert(package_table != NULL, "Missing package_table");
385
386 // Check that none of the packages exist in the class loader's package table.
387 for (int x = 0; x < pkg_list->length(); x++) {
388 existing_pkg = package_table->lookup_only(pkg_list->at(x));
389 if (existing_pkg != NULL) {
390 // This could be because the module was already defined. If so,
391 // report that error instead of the package error.
392 if (module_table->lookup_only(module_symbol) != NULL) {
393 dupl_modules = true;
394 }
395 break;
396 }
397 }
398 } // if (num_packages > 0)...
399
400 // Add the module and its packages.
401 if (!dupl_modules && existing_pkg == NULL) {
402 // Create the entry for this module in the class loader's module entry table.
403 ModuleEntry* module_entry = module_table->locked_create_entry_or_null(module_handle,
404 (is_open == JNI_TRUE), 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.Module object.
424 java_lang_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 log_info(module, load)("%s location: %s", module_name,
438 module_location != NULL ? module_location : "NULL");
439 if (log_is_enabled(Debug, module)) {
440 outputStream* logst = Log(module)::debug_stream();
441 logst->print("define_module(): creation of module: %s, version: %s, location: %s, ",
442 module_name, module_version != NULL ? module_version : "NULL",
443 module_location != NULL ? module_location : "NULL");
444 loader_data->print_value_on(logst);
445 logst->print_cr(", package #: %d", pkg_list->length());
446 for (int y = 0; y < pkg_list->length(); y++) {
447 log_trace(module)("define_module(): creation of package %s for module %s",
448 (pkg_list->at(y))->as_C_string(), module_name);
449 }
450 }
451
452 // If the module is defined to the boot loader and an exploded build is being
453 // used, prepend <java.home>/modules/modules_name to the system boot class path.
454 if (loader == NULL && !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_Module::is_instance(module_handle())) {
467 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
468 "module is not an instance of type java.lang.Module");
469 }
470
471 // Ensure that this is an unnamed module
472 oop name = java_lang_Module::name(module_handle());
473 if (name != NULL) {
474 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
475 "boot loader's unnamed module's java.lang.Module has a name");
476 }
477
478 // Validate java_base's loader is the boot loader.
479 oop loader = java_lang_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(module)("set_bootloader_unnamed_module(): recording unnamed module for boot loader");
487
488 // Set java.lang.Module for the boot loader's unnamed module
489 ClassLoaderData* boot_loader_data = ClassLoaderData::the_null_class_loader_data();
490 ModuleEntry* unnamed_module = boot_loader_data->unnamed_module();
491 assert(unnamed_module != NULL, "boot loader's unnamed ModuleEntry not defined");
492 unnamed_module->set_module(boot_loader_data->add_handle(module_handle));
493 // Store pointer to the ModuleEntry in the unnamed module's java.lang.Module object.
494 java_lang_Module::set_module_entry(module_handle(), unnamed_module);
495 }
496
497 void Modules::add_module_exports(jobject from_module, const char* package_name, jobject to_module, TRAPS) {
498 if (package_name == NULL) {
499 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
500 "package is null");
501 }
502 if (from_module == NULL) {
503 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
504 "from_module is null");
505 }
506 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
507 if (from_module_entry == NULL) {
508 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
509 "from_module cannot be found");
510 }
511
512 // All packages in unnamed and open modules are exported by default.
513 if (!from_module_entry->is_named() || from_module_entry->is_open()) return;
514
515 ModuleEntry* to_module_entry;
516 if (to_module == NULL) {
517 to_module_entry = NULL; // It's an unqualified export.
518 } else {
519 to_module_entry = get_module_entry(to_module, CHECK);
520 if (to_module_entry == NULL) {
521 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
522 "to_module is invalid");
523 }
524 }
525
526 PackageEntry *package_entry = get_package_entry(from_module_entry, package_name, CHECK);
527 ResourceMark rm(THREAD);
528 if (package_entry == NULL) {
529 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
530 err_msg("Package %s not found in from_module %s",
531 package_name != NULL ? package_name : "",
532 from_module_entry->name()->as_C_string()));
533 }
534 if (package_entry->module() != from_module_entry) {
535 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
536 err_msg("Package: %s found in module %s, not in from_module: %s",
537 package_entry->name()->as_C_string(),
538 package_entry->module()->name()->as_C_string(),
539 from_module_entry->name()->as_C_string()));
540 }
541
542 log_debug(module)("add_module_exports(): package %s in module %s is exported to module %s",
543 package_entry->name()->as_C_string(),
544 from_module_entry->name()->as_C_string(),
545 to_module_entry == NULL ? "NULL" :
546 to_module_entry->is_named() ?
547 to_module_entry->name()->as_C_string() : UNNAMED_MODULE);
548
549 // Do nothing if modules are the same.
550 if (from_module_entry != to_module_entry) {
551 package_entry->set_exported(to_module_entry);
552 }
553 }
554
555
556 void Modules::add_module_exports_qualified(jobject from_module, const char* package,
557 jobject to_module, TRAPS) {
558 if (to_module == NULL) {
559 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
560 "to_module is null");
561 }
562 add_module_exports(from_module, package, to_module, CHECK);
563 }
564
565 void Modules::add_reads_module(jobject from_module, jobject to_module, TRAPS) {
566 if (from_module == NULL) {
567 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
568 "from_module is null");
569 }
570
571 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
572 if (from_module_entry == NULL) {
573 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
574 "from_module is not valid");
575 }
576
577 ModuleEntry* to_module_entry;
578 if (to_module != NULL) {
579 to_module_entry = get_module_entry(to_module, CHECK);
580 if (to_module_entry == NULL) {
581 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
582 "to_module is invalid");
583 }
584 } else {
585 to_module_entry = NULL;
586 }
587
588 ResourceMark rm(THREAD);
589 log_debug(module)("add_reads_module(): Adding read from module %s to module %s",
590 from_module_entry->is_named() ?
591 from_module_entry->name()->as_C_string() : UNNAMED_MODULE,
592 to_module_entry == NULL ? "all unnamed" :
593 (to_module_entry->is_named() ?
594 to_module_entry->name()->as_C_string() : UNNAMED_MODULE));
595
596 // if modules are the same or if from_module is unnamed then no need to add the read.
597 if (from_module_entry != to_module_entry && from_module_entry->is_named()) {
598 from_module_entry->add_read(to_module_entry);
599 }
600 }
601
602 // This method is called by JFR and JNI.
603 jobject Modules::get_module(jclass clazz, TRAPS) {
604 assert(ModuleEntryTable::javabase_defined(),
605 "Attempt to call get_module before " JAVA_BASE_NAME " is defined");
606
607 if (clazz == NULL) {
608 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
609 "class is null", JNI_FALSE);
610 }
611 oop mirror = JNIHandles::resolve_non_null(clazz);
612 if (mirror == NULL) {
613 log_debug(module)("get_module(): no mirror, returning NULL");
614 return NULL;
615 }
616 if (!java_lang_Class::is_instance(mirror)) {
617 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
618 "Invalid class", JNI_FALSE);
619 }
620
621 oop module = java_lang_Class::module(mirror);
622
623 assert(module != NULL, "java.lang.Class module field not set");
624 assert(java_lang_Module::is_instance(module), "module is not an instance of type java.lang.Module");
625
626 if (log_is_enabled(Debug, module)) {
627 ResourceMark rm(THREAD);
628 outputStream* logst = Log(module)::debug_stream();
629 Klass* klass = java_lang_Class::as_Klass(mirror);
630 oop module_name = java_lang_Module::name(module);
631 if (module_name != NULL) {
632 logst->print("get_module(): module ");
633 java_lang_String::print(module_name, tty);
634 } else {
635 logst->print("get_module(): Unamed Module");
636 }
637 if (klass != NULL) {
638 logst->print_cr(" for class %s", klass->external_name());
639 } else {
640 logst->print_cr(" for primitive class");
641 }
642 }
643
644 return JNIHandles::make_local(THREAD, module);
645 }
646
647 jobject Modules::get_named_module(Handle h_loader, const char* package_name, TRAPS) {
648 assert(ModuleEntryTable::javabase_defined(),
649 "Attempt to call get_named_module before " JAVA_BASE_NAME " is defined");
650 assert(h_loader.is_null() || java_lang_ClassLoader::is_subclass(h_loader->klass()),
651 "Class loader is not a subclass of java.lang.ClassLoader");
652 assert(package_name != NULL, "the package_name should not be NULL");
653
654 if (strlen(package_name) == 0) {
655 return NULL;
656 }
657 TempNewSymbol package_sym = SymbolTable::new_symbol(package_name, CHECK_NULL);
658 const PackageEntry* const pkg_entry =
659 get_package_entry_by_name(package_sym, h_loader, THREAD);
660 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
661
662 if (module_entry != NULL && module_entry->module() != NULL && module_entry->is_named()) {
663 return JNIHandles::make_local(THREAD, JNIHandles::resolve(module_entry->module()));
664 }
665 return NULL;
666 }
667
668
669 // This method is called by JFR and by the above method.
670 jobject Modules::get_module(Symbol* package_name, Handle h_loader, TRAPS) {
671 const PackageEntry* const pkg_entry =
672 get_package_entry_by_name(package_name, h_loader, THREAD);
673 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
674
675 if (module_entry != NULL &&
676 module_entry->module() != NULL) {
677 return JNIHandles::make_local(THREAD, JNIHandles::resolve(module_entry->module()));
678 }
679
680 return NULL;
681 }
682
683 void Modules::add_module_package(jobject module, const char* package_name, TRAPS) {
684 ResourceMark rm(THREAD);
685
686 if (module == NULL) {
687 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
688 "module is null");
689 }
690 if (package_name == NULL) {
691 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
692 "package is null");
693 }
694 ModuleEntry* module_entry = get_module_entry(module, CHECK);
695 if (module_entry == NULL) {
696 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
697 "module is invalid");
698 }
699 if (!module_entry->is_named()) {
700 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
701 "module cannot be an unnamed module");
702 }
703 if (!verify_package_name(package_name)) {
704 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
705 err_msg("Invalid package name: %s", package_name));
706 }
707
708 ClassLoaderData *loader_data = module_entry->loader_data();
709
710 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
711 if (!loader_data->is_the_null_class_loader_data() &&
712 !loader_data->is_platform_class_loader_data() &&
713 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&
714 (package_name[JAVAPKG_LEN] == '/' || package_name[JAVAPKG_LEN] == '\0'))) {
715 const char* class_loader_name = SystemDictionary::loader_name(loader_data);
716 size_t pkg_len = strlen(package_name);
717 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len);
718 strncpy(pkg_name, package_name, pkg_len);
719 StringUtils::replace_no_expand(pkg_name, "/", ".");
720 const char* msg_text1 = "Class loader (instance of): ";
721 const char* msg_text2 = " tried to define prohibited package name: ";
722 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;
723 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
724 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);
725 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);
726 }
727
728 log_debug(module)("add_module_package(): Adding package %s to module %s",
729 package_name, module_entry->name()->as_C_string());
730
731 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);
732 PackageEntryTable* package_table = loader_data->packages();
733 assert(package_table != NULL, "Missing package_table");
734
735 PackageEntry* existing_pkg = NULL;
736 {
737 MutexLocker ml(Module_lock, THREAD);
738
739 // Check that the package does not exist in the class loader's package table.
740 existing_pkg = package_table->lookup_only(pkg_symbol);
741 if (existing_pkg == NULL) {
742 PackageEntry* pkg = package_table->locked_create_entry_or_null(pkg_symbol, module_entry);
743 assert(pkg != NULL, "Unable to create a module's package entry");
744 }
745 }
746 if (existing_pkg != NULL) {
747 throw_dup_pkg_exception(module_entry->name()->as_C_string(), existing_pkg, CHECK);
748 }
749 }
750
751 // Export package in module to all unnamed modules.
752 void Modules::add_module_exports_to_all_unnamed(jobject module, const char* package_name, TRAPS) {
753 if (module == NULL) {
754 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
755 "module is null");
756 }
757 if (package_name == NULL) {
758 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
759 "package is null");
760 }
761 ModuleEntry* module_entry = get_module_entry(module, CHECK);
762 if (module_entry == NULL) {
763 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
764 "module is invalid");
765 }
766
767 if (module_entry->is_named()) { // No-op for unnamed module.
768 PackageEntry *package_entry = get_package_entry(module_entry, package_name, CHECK);
769 ResourceMark rm(THREAD);
770 if (package_entry == NULL) {
771 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
772 err_msg("Package %s not found in module %s",
773 package_name != NULL ? package_name : "",
774 module_entry->name()->as_C_string()));
775 }
776 if (package_entry->module() != module_entry) {
777 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
778 err_msg("Package: %s found in module %s, not in module: %s",
779 package_entry->name()->as_C_string(),
780 package_entry->module()->name()->as_C_string(),
781 module_entry->name()->as_C_string()));
782 }
783
784 log_debug(module)("add_module_exports_to_all_unnamed(): package %s in module"
785 " %s is exported to all unnamed modules",
786 package_entry->name()->as_C_string(),
787 module_entry->name()->as_C_string());
788
789 // Mark package as exported to all unnamed modules.
790 package_entry->set_is_exported_allUnnamed();
791 }
792 }