1 /*
2 * Copyright (c) 2016, 2018, 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 "jvm.h"
27 #include "classfile/classFileParser.hpp"
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.inline.hpp"
30 #include "classfile/javaAssertions.hpp"
31 #include "classfile/javaClasses.hpp"
32 #include "classfile/javaClasses.inline.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/modules.hpp"
35 #include "classfile/packageEntry.hpp"
36 #include "classfile/stringTable.hpp"
37 #include "classfile/symbolTable.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "logging/log.hpp"
41 #include "logging/logStream.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "oops/instanceKlass.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/handles.inline.hpp"
46 #include "runtime/javaCalls.hpp"
47 #include "runtime/jniHandles.inline.hpp"
48 #include "runtime/reflection.hpp"
49 #include "utilities/stringUtils.hpp"
50 #include "utilities/utf8.hpp"
51
52 static bool verify_module_name(const char *module_name) {
53 if (module_name == NULL) return false;
54 int len = (int)strlen(module_name);
55 return (len > 0 && len <= Symbol::max_length());
56 }
57
58 bool Modules::verify_package_name(const char* package_name) {
59 if (package_name == NULL) return false;
60 int len = (int)strlen(package_name);
61 return (len > 0 && len <= Symbol::max_length() &&
62 UTF8::is_legal_utf8((const unsigned char *)package_name, len, false) &&
63 ClassFileParser::verify_unqualified_name(package_name, len,
64 ClassFileParser::LegalClass));
65 }
66
67 static char* get_module_name(oop module, TRAPS) {
68 oop name_oop = java_lang_Module::name(module);
69 if (name_oop == NULL) {
70 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(), "Null module name");
71 }
72 char* module_name = java_lang_String::as_utf8_string(name_oop);
73 if (!verify_module_name(module_name)) {
74 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
75 err_msg("Invalid module name: %s",
76 module_name != NULL ? module_name : "NULL"));
77 }
78 return module_name;
79 }
80
81 static const char* get_module_version(jstring version) {
82 if (version == NULL) {
83 return NULL;
84 }
85 return java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(version));
86 }
87
88 ModuleEntryTable* Modules::get_module_entry_table(Handle h_loader) {
89 // This code can be called during start-up, before the classLoader's classLoader data got
90 // created. So, call register_loader() to make sure the classLoader data gets created.
91 ClassLoaderData *loader_cld = SystemDictionary::register_loader(h_loader);
92 return loader_cld->modules();
93 }
94
95 static PackageEntryTable* get_package_entry_table(Handle h_loader) {
96 // This code can be called during start-up, before the classLoader's classLoader data got
97 // created. So, call register_loader() to make sure the classLoader data gets created.
98 ClassLoaderData *loader_cld = SystemDictionary::register_loader(h_loader);
99 return loader_cld->packages();
100 }
101
102 static ModuleEntry* get_module_entry(jobject module, TRAPS) {
103 oop m = JNIHandles::resolve(module);
104 if (!java_lang_Module::is_instance(m)) {
105 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
106 "module is not an instance of type java.lang.Module");
107 }
108 return java_lang_Module::module_entry(m);
109 }
110
111 static PackageEntry* get_package_entry(ModuleEntry* module_entry, const char* package_name, TRAPS) {
112 ResourceMark rm(THREAD);
113 if (package_name == NULL) return NULL;
114 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(package_name, CHECK_NULL);
115 PackageEntryTable* package_entry_table = module_entry->loader_data()->packages();
116 assert(package_entry_table != NULL, "Unexpected null package entry table");
117 return package_entry_table->lookup_only(pkg_symbol);
118 }
119
120 static PackageEntry* get_package_entry_by_name(Symbol* package,
121 Handle h_loader,
122 TRAPS) {
123 if (package != NULL) {
124 ResourceMark rm(THREAD);
125 if (Modules::verify_package_name(package->as_C_string())) {
126 PackageEntryTable* const package_entry_table =
127 get_package_entry_table(h_loader);
128 assert(package_entry_table != NULL, "Unexpected null package entry table");
129 return package_entry_table->lookup_only(package);
130 }
131 }
132 return NULL;
133 }
134
135 bool Modules::is_package_defined(Symbol* package, Handle h_loader, TRAPS) {
136 PackageEntry* res = get_package_entry_by_name(package, h_loader, CHECK_false);
137 return res != NULL;
138 }
139
140 static void define_javabase_module(jobject module, jstring version,
141 jstring location, const char* const* packages,
142 jsize num_packages, TRAPS) {
143 ResourceMark rm(THREAD);
144
145 Handle module_handle(THREAD, JNIHandles::resolve(module));
146
147 // Obtain java.base's module version
148 const char* module_version = get_module_version(version);
149 TempNewSymbol version_symbol;
150 if (module_version != NULL) {
151 version_symbol = SymbolTable::new_symbol(module_version, CHECK);
152 } else {
153 version_symbol = NULL;
154 }
155
156 // Obtain java.base's location
157 const char* module_location = NULL;
158 TempNewSymbol location_symbol = NULL;
159 if (location != NULL) {
160 module_location =
161 java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(location));
162 if (module_location != NULL) {
163 location_symbol = SymbolTable::new_symbol(module_location, CHECK);
164 }
165 }
166
167
168 // Check that the packages are syntactically ok.
169 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
170 for (int x = 0; x < num_packages; x++) {
171 const char *package_name = packages[x];
172 if (!Modules::verify_package_name(package_name)) {
173 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
174 err_msg("Invalid package name: %s for module: " JAVA_BASE_NAME, package_name));
175 }
176 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);
177 pkg_list->append(pkg_symbol);
178 }
179
180 // Validate java_base's loader is the boot loader.
181 oop loader = java_lang_Module::loader(module_handle());
182 if (loader != NULL) {
183 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
184 "Class loader must be the boot class loader");
185 }
186 Handle h_loader(THREAD, loader);
187
188 // Ensure the boot loader's PackageEntryTable has been created
189 PackageEntryTable* package_table = get_package_entry_table(h_loader);
190 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package_table");
191
192 // Ensure java.base's ModuleEntry has been created
193 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, "No ModuleEntry for " JAVA_BASE_NAME);
194
195 bool duplicate_javabase = false;
196 {
197 MutexLocker m1(Module_lock, THREAD);
198
199 if (ModuleEntryTable::javabase_defined()) {
200 duplicate_javabase = true;
201 } else {
202
203 // Verify that all java.base packages created during bootstrapping are in
204 // pkg_list. If any are not in pkg_list, than a non-java.base class was
205 // loaded erroneously pre java.base module definition.
206 package_table->verify_javabase_packages(pkg_list);
207
208 // loop through and add any new packages for java.base
209 PackageEntry* pkg;
210 for (int x = 0; x < pkg_list->length(); x++) {
211 // Some of java.base's packages were added early in bootstrapping, ignore duplicates.
212 if (package_table->lookup_only(pkg_list->at(x)) == NULL) {
213 pkg = package_table->locked_create_entry_or_null(pkg_list->at(x), ModuleEntryTable::javabase_moduleEntry());
214 assert(pkg != NULL, "Unable to create a " JAVA_BASE_NAME " package entry");
215 }
216 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
217 // the Symbol* that was created above for each package. The refcount was incremented
218 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
219 pkg_list->at(x)->decrement_refcount();
220 }
221
222 // Finish defining java.base's ModuleEntry
223 ModuleEntryTable::finalize_javabase(module_handle, version_symbol, location_symbol);
224 }
225 }
226 if (duplicate_javabase) {
227 THROW_MSG(vmSymbols::java_lang_InternalError(),
228 "Module " JAVA_BASE_NAME " is already defined");
229 }
230
231 // Only the thread that actually defined the base module will get here,
232 // so no locking is needed.
233
234 // Patch any previously loaded class's module field with java.base's java.lang.Module.
235 ModuleEntryTable::patch_javabase_entries(module_handle);
236
237 log_info(module, load)(JAVA_BASE_NAME " location: %s",
238 module_location != NULL ? module_location : "NULL");
239 log_debug(module)("define_javabase_module(): Definition of module: "
240 JAVA_BASE_NAME ", version: %s, location: %s, package #: %d",
241 module_version != NULL ? module_version : "NULL",
242 module_location != NULL ? module_location : "NULL",
243 pkg_list->length());
244
245 // packages defined to java.base
246 if (log_is_enabled(Trace, module)) {
247 for (int x = 0; x < pkg_list->length(); x++) {
248 log_trace(module)("define_javabase_module(): creation of package %s for module " JAVA_BASE_NAME,
249 (pkg_list->at(x))->as_C_string());
250 }
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, jboolean is_open, 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_Module::is_instance(module_handle())) {
289 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
290 "module is not an instance of type java.lang.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 assert(is_open == JNI_FALSE, "java.base module cannot be open");
302 define_javabase_module(module, version, location, packages, num_packages, CHECK);
303 return;
304 }
305
306 const char* module_version = get_module_version(version);
307
308 oop loader = java_lang_Module::loader(module_handle());
309 // Make sure loader is not the jdk.internal.reflect.DelegatingClassLoader.
310 if (loader != java_lang_ClassLoader::non_reflection_class_loader(loader)) {
311 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
312 "Class loader is an invalid delegating class loader");
313 }
314 Handle h_loader = Handle(THREAD, loader);
315 // define_module can be called during start-up, before the class loader's ClassLoaderData
316 // has been created. SystemDictionary::register_loader ensures creation, if needed.
317 ClassLoaderData* loader_data = SystemDictionary::register_loader(h_loader);
318 assert(loader_data != NULL, "class loader data shouldn't be null");
319
320 // Check that the list of packages has no duplicates and that the
321 // packages are syntactically ok.
322 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
323 for (int x = 0; x < num_packages; x++) {
324 const char* package_name = packages[x];
325 if (!verify_package_name(package_name)) {
326 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
327 err_msg("Invalid package name: %s for module: %s",
328 package_name, module_name));
329 }
330
331 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
332 if (!h_loader.is_null() &&
333 !SystemDictionary::is_platform_class_loader(h_loader()) &&
334 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&
335 (package_name[JAVAPKG_LEN] == '/' || package_name[JAVAPKG_LEN] == '\0'))) {
336 const char* class_loader_name = loader_data->loader_name();
337 size_t pkg_len = strlen(package_name);
338 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len);
339 strncpy(pkg_name, package_name, pkg_len);
340 StringUtils::replace_no_expand(pkg_name, "/", ".");
341 const char* msg_text1 = "Class loader (instance of): ";
342 const char* msg_text2 = " tried to define prohibited package name: ";
343 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;
344 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
345 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);
346 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);
347 }
348
349 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);
350 pkg_list->append(pkg_symbol);
351 }
352
353 ModuleEntryTable* module_table = get_module_entry_table(h_loader);
354 assert(module_table != NULL, "module entry table shouldn't be null");
355
356 // Create symbol* entry for module name.
357 TempNewSymbol module_symbol = SymbolTable::new_symbol(module_name, CHECK);
358
359 bool dupl_modules = false;
360
361 // Create symbol* entry for module version.
362 TempNewSymbol version_symbol;
363 if (module_version != NULL) {
364 version_symbol = SymbolTable::new_symbol(module_version, CHECK);
365 } else {
366 version_symbol = NULL;
367 }
368
369 // Create symbol* entry for module location.
370 const char* module_location = NULL;
371 TempNewSymbol location_symbol = NULL;
372 if (location != NULL) {
373 module_location =
374 java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(location));
375 if (module_location != NULL) {
376 location_symbol = SymbolTable::new_symbol(module_location, CHECK);
377 }
378 }
379
380 PackageEntryTable* package_table = NULL;
381 PackageEntry* existing_pkg = NULL;
382 {
383 MutexLocker ml(Module_lock, THREAD);
384
385 if (num_packages > 0) {
386 package_table = get_package_entry_table(h_loader);
387 assert(package_table != NULL, "Missing package_table");
388
389 // Check that none of the packages exist in the class loader's package table.
390 for (int x = 0; x < pkg_list->length(); x++) {
391 existing_pkg = package_table->lookup_only(pkg_list->at(x));
392 if (existing_pkg != NULL) {
393 // This could be because the module was already defined. If so,
394 // report that error instead of the package error.
395 if (module_table->lookup_only(module_symbol) != NULL) {
396 dupl_modules = true;
397 }
398 break;
399 }
400 }
401 } // if (num_packages > 0)...
402
403 // Add the module and its packages.
404 if (!dupl_modules && existing_pkg == NULL) {
405 // Create the entry for this module in the class loader's module entry table.
406 ModuleEntry* module_entry = module_table->locked_create_entry_or_null(module_handle,
407 (is_open == JNI_TRUE), module_symbol,
408 version_symbol, location_symbol, loader_data);
409
410 if (module_entry == NULL) {
411 dupl_modules = true;
412 } else {
413 // Add the packages.
414 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package table");
415 PackageEntry* pkg;
416 for (int y = 0; y < pkg_list->length(); y++) {
417 pkg = package_table->locked_create_entry_or_null(pkg_list->at(y), module_entry);
418 assert(pkg != NULL, "Unable to create a module's package entry");
419
420 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
421 // the Symbol* that was created above for each package. The refcount was incremented
422 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
423 pkg_list->at(y)->decrement_refcount();
424 }
425
426 // Store pointer to ModuleEntry record in java.lang.Module object.
427 java_lang_Module::set_module_entry(module_handle(), module_entry);
428 }
429 }
430 } // Release the lock
431
432 // any errors ?
433 if (dupl_modules) {
434 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
435 err_msg("Module %s is already defined", module_name));
436 } else if (existing_pkg != NULL) {
437 throw_dup_pkg_exception(module_name, existing_pkg, CHECK);
438 }
439
440 log_info(module, load)("%s location: %s", module_name,
441 module_location != NULL ? module_location : "NULL");
442 LogTarget(Debug, module) lt;
443 if (lt.is_enabled()) {
444 LogStream ls(lt);
445 ls.print("define_module(): creation of module: %s, version: %s, location: %s, ",
446 module_name, module_version != NULL ? module_version : "NULL",
447 module_location != NULL ? module_location : "NULL");
448 loader_data->print_value_on(&ls);
449 ls.print_cr(", package #: %d", pkg_list->length());
450 for (int y = 0; y < pkg_list->length(); y++) {
451 log_trace(module)("define_module(): creation of package %s for module %s",
452 (pkg_list->at(y))->as_C_string(), module_name);
453 }
454 }
455
456 // If the module is defined to the boot loader and an exploded build is being
457 // used, prepend <java.home>/modules/modules_name to the system boot class path.
458 if (loader == NULL && !ClassLoader::has_jrt_entry()) {
459 ClassLoader::add_to_exploded_build_list(module_symbol, CHECK);
460 }
461 }
462
463 void Modules::set_bootloader_unnamed_module(jobject module, TRAPS) {
464 ResourceMark rm(THREAD);
465
466 if (module == NULL) {
467 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
468 }
469 Handle module_handle(THREAD, JNIHandles::resolve(module));
470 if (!java_lang_Module::is_instance(module_handle())) {
471 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
472 "module is not an instance of type java.lang.Module");
473 }
474
475 // Ensure that this is an unnamed module
476 oop name = java_lang_Module::name(module_handle());
477 if (name != NULL) {
478 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
479 "boot loader's unnamed module's java.lang.Module has a name");
480 }
481
482 // Validate java_base's loader is the boot loader.
483 oop loader = java_lang_Module::loader(module_handle());
484 if (loader != NULL) {
485 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
486 "Class loader must be the boot class loader");
487 }
488 Handle h_loader(THREAD, loader);
489
490 log_debug(module)("set_bootloader_unnamed_module(): recording unnamed module for boot loader");
491
492 // Set java.lang.Module for the boot loader's unnamed module
493 ClassLoaderData* boot_loader_data = ClassLoaderData::the_null_class_loader_data();
494 ModuleEntry* unnamed_module = boot_loader_data->unnamed_module();
495 assert(unnamed_module != NULL, "boot loader's unnamed ModuleEntry not defined");
496 unnamed_module->set_module(boot_loader_data->add_handle(module_handle));
497 // Store pointer to the ModuleEntry in the unnamed module's java.lang.Module object.
498 java_lang_Module::set_module_entry(module_handle(), unnamed_module);
499 }
500
501 void Modules::add_module_exports(jobject from_module, const char* package_name, jobject to_module, TRAPS) {
502 if (package_name == NULL) {
503 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
504 "package is null");
505 }
506 if (from_module == NULL) {
507 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
508 "from_module is null");
509 }
510 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
511 if (from_module_entry == NULL) {
512 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
513 "from_module cannot be found");
514 }
515
516 // All packages in unnamed and open modules are exported by default.
517 if (!from_module_entry->is_named() || from_module_entry->is_open()) return;
518
519 ModuleEntry* to_module_entry;
520 if (to_module == NULL) {
521 to_module_entry = NULL; // It's an unqualified export.
522 } else {
523 to_module_entry = get_module_entry(to_module, CHECK);
524 if (to_module_entry == NULL) {
525 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
526 "to_module is invalid");
527 }
528 }
529
530 PackageEntry *package_entry = get_package_entry(from_module_entry, package_name, CHECK);
531 ResourceMark rm(THREAD);
532 if (package_entry == NULL) {
533 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
534 err_msg("Package %s not found in from_module %s",
535 package_name != NULL ? package_name : "",
536 from_module_entry->name()->as_C_string()));
537 }
538 if (package_entry->module() != from_module_entry) {
539 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
540 err_msg("Package: %s found in module %s, not in from_module: %s",
541 package_entry->name()->as_C_string(),
542 package_entry->module()->name()->as_C_string(),
543 from_module_entry->name()->as_C_string()));
544 }
545
546 log_debug(module)("add_module_exports(): package %s in module %s is exported to module %s",
547 package_entry->name()->as_C_string(),
548 from_module_entry->name()->as_C_string(),
549 to_module_entry == NULL ? "NULL" :
550 to_module_entry->is_named() ?
551 to_module_entry->name()->as_C_string() : UNNAMED_MODULE);
552
553 // Do nothing if modules are the same.
554 if (from_module_entry != to_module_entry) {
555 package_entry->set_exported(to_module_entry);
556 }
557 }
558
559
560 void Modules::add_module_exports_qualified(jobject from_module, const char* package,
561 jobject to_module, TRAPS) {
562 if (to_module == NULL) {
563 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
564 "to_module is null");
565 }
566 add_module_exports(from_module, package, to_module, CHECK);
567 }
568
569 void Modules::add_reads_module(jobject from_module, jobject to_module, TRAPS) {
570 if (from_module == NULL) {
571 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
572 "from_module is null");
573 }
574
575 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
576 if (from_module_entry == NULL) {
577 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
578 "from_module is not valid");
579 }
580
581 ModuleEntry* to_module_entry;
582 if (to_module != NULL) {
583 to_module_entry = get_module_entry(to_module, CHECK);
584 if (to_module_entry == NULL) {
585 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
586 "to_module is invalid");
587 }
588 } else {
589 to_module_entry = NULL;
590 }
591
592 ResourceMark rm(THREAD);
593 log_debug(module)("add_reads_module(): Adding read from module %s to module %s",
594 from_module_entry->is_named() ?
595 from_module_entry->name()->as_C_string() : UNNAMED_MODULE,
596 to_module_entry == NULL ? "all unnamed" :
597 (to_module_entry->is_named() ?
598 to_module_entry->name()->as_C_string() : UNNAMED_MODULE));
599
600 // if modules are the same or if from_module is unnamed then no need to add the read.
601 if (from_module_entry != to_module_entry && from_module_entry->is_named()) {
602 from_module_entry->add_read(to_module_entry);
603 }
604 }
605
606 // This method is called by JFR and JNI.
607 jobject Modules::get_module(jclass clazz, TRAPS) {
608 assert(ModuleEntryTable::javabase_defined(),
609 "Attempt to call get_module before " JAVA_BASE_NAME " is defined");
610
611 if (clazz == NULL) {
612 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
613 "class is null", JNI_FALSE);
614 }
615 oop mirror = JNIHandles::resolve_non_null(clazz);
616 if (mirror == NULL) {
617 log_debug(module)("get_module(): no mirror, returning NULL");
618 return NULL;
619 }
620 if (!java_lang_Class::is_instance(mirror)) {
621 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
622 "Invalid class", JNI_FALSE);
623 }
624
625 oop module = java_lang_Class::module(mirror);
626
627 assert(module != NULL, "java.lang.Class module field not set");
628 assert(java_lang_Module::is_instance(module), "module is not an instance of type java.lang.Module");
629
630 LogTarget(Debug,module) lt;
631 if (lt.is_enabled()) {
632 ResourceMark rm(THREAD);
633 LogStream ls(lt);
634 Klass* klass = java_lang_Class::as_Klass(mirror);
635 oop module_name = java_lang_Module::name(module);
636 if (module_name != NULL) {
637 ls.print("get_module(): module ");
638 java_lang_String::print(module_name, tty);
639 } else {
640 ls.print("get_module(): Unamed Module");
641 }
642 if (klass != NULL) {
643 ls.print_cr(" for class %s", klass->external_name());
644 } else {
645 ls.print_cr(" for primitive class");
646 }
647 }
648
649 return JNIHandles::make_local(THREAD, module);
650 }
651
652 jobject Modules::get_named_module(Handle h_loader, const char* package_name, TRAPS) {
653 assert(ModuleEntryTable::javabase_defined(),
654 "Attempt to call get_named_module before " JAVA_BASE_NAME " is defined");
655 assert(h_loader.is_null() || java_lang_ClassLoader::is_subclass(h_loader->klass()),
656 "Class loader is not a subclass of java.lang.ClassLoader");
657 assert(package_name != NULL, "the package_name should not be NULL");
658
659 if (strlen(package_name) == 0) {
660 return NULL;
661 }
662 TempNewSymbol package_sym = SymbolTable::new_symbol(package_name, CHECK_NULL);
663 const PackageEntry* const pkg_entry =
664 get_package_entry_by_name(package_sym, h_loader, THREAD);
665 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
666
667 if (module_entry != NULL && module_entry->module() != NULL && module_entry->is_named()) {
668 return JNIHandles::make_local(THREAD, module_entry->module());
669 }
670 return NULL;
671 }
672
673
674 // This method is called by JFR and by the above method.
675 jobject Modules::get_module(Symbol* package_name, Handle h_loader, TRAPS) {
676 const PackageEntry* const pkg_entry =
677 get_package_entry_by_name(package_name, h_loader, THREAD);
678 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
679
680 if (module_entry != NULL &&
681 module_entry->module() != NULL) {
682 return JNIHandles::make_local(THREAD, module_entry->module());
683 }
684
685 return NULL;
686 }
687
688 // Export package in module to all unnamed modules.
689 void Modules::add_module_exports_to_all_unnamed(jobject module, const char* package_name, TRAPS) {
690 if (module == NULL) {
691 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
692 "module is null");
693 }
694 if (package_name == NULL) {
695 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
696 "package is null");
697 }
698 ModuleEntry* module_entry = get_module_entry(module, CHECK);
699 if (module_entry == NULL) {
700 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
701 "module is invalid");
702 }
703
704 if (module_entry->is_named()) { // No-op for unnamed module.
705 PackageEntry *package_entry = get_package_entry(module_entry, package_name, CHECK);
706 ResourceMark rm(THREAD);
707 if (package_entry == NULL) {
708 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
709 err_msg("Package %s not found in module %s",
710 package_name != NULL ? package_name : "",
711 module_entry->name()->as_C_string()));
712 }
713 if (package_entry->module() != module_entry) {
714 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
715 err_msg("Package: %s found in module %s, not in module: %s",
716 package_entry->name()->as_C_string(),
717 package_entry->module()->name()->as_C_string(),
718 module_entry->name()->as_C_string()));
719 }
720
721 log_debug(module)("add_module_exports_to_all_unnamed(): package %s in module"
722 " %s is exported to all unnamed modules",
723 package_entry->name()->as_C_string(),
724 module_entry->name()->as_C_string());
725
726 // Mark package as exported to all unnamed modules.
727 package_entry->set_is_exported_allUnnamed();
728 }
729 }