1 /*
2 * Copyright (c) 2016, 2020, 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/classLoaderDataShared.hpp"
31 #include "classfile/javaAssertions.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/javaClasses.inline.hpp"
34 #include "classfile/moduleEntry.hpp"
35 #include "classfile/modules.hpp"
36 #include "classfile/packageEntry.hpp"
37 #include "classfile/stringTable.hpp"
38 #include "classfile/symbolTable.hpp"
39 #include "classfile/systemDictionary.hpp"
40 #include "classfile/vmSymbols.hpp"
41 #include "logging/log.hpp"
42 #include "logging/logStream.hpp"
43 #include "memory/metaspaceShared.hpp"
44 #include "memory/resourceArea.hpp"
45 #include "runtime/handles.inline.hpp"
46 #include "runtime/javaCalls.hpp"
47 #include "runtime/jniHandles.inline.hpp"
48 #include "utilities/stringUtils.hpp"
49 #include "utilities/utf8.hpp"
50
51 static bool verify_module_name(const char *module_name, int len) {
52 assert(module_name != NULL, "invariant");
53 return (len > 0 && len <= Symbol::max_length());
54 }
55
56 static bool verify_package_name(const char* package_name, int len) {
57 assert(package_name != NULL, "Package name derived from non-null jstring can't be NULL");
58 return (len > 0 && len <= Symbol::max_length() &&
59 ClassFileParser::verify_unqualified_name(package_name, len,
60 ClassFileParser::LegalClass));
61 }
62
63 static char* get_module_name(oop module, int& len, TRAPS) {
64 oop name_oop = java_lang_Module::name(module);
65 if (name_oop == NULL) {
66 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(), "Null module name");
67 }
68 char* module_name = java_lang_String::as_utf8_string(name_oop, len);
69 if (!verify_module_name(module_name, len)) {
70 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
71 err_msg("Invalid module name: %s", module_name));
72 }
73 return module_name;
74 }
75
76 static Symbol* as_symbol(jstring str_object) {
77 if (str_object == NULL) {
78 return NULL;
79 }
80 int len;
81 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(str_object), len);
82 return SymbolTable::new_symbol(str, len);
83 }
84
85 ModuleEntryTable* Modules::get_module_entry_table(Handle h_loader) {
86 // This code can be called during start-up, before the classLoader's classLoader data got
87 // created. So, call register_loader() to make sure the classLoader data gets created.
88 ClassLoaderData *loader_cld = SystemDictionary::register_loader(h_loader);
89 return loader_cld->modules();
90 }
91
92 static PackageEntryTable* get_package_entry_table(Handle h_loader) {
93 // This code can be called during start-up, before the classLoader's classLoader data got
94 // created. So, call register_loader() to make sure the classLoader data gets created.
95 ClassLoaderData *loader_cld = SystemDictionary::register_loader(h_loader);
96 return loader_cld->packages();
97 }
98
99 static ModuleEntry* get_module_entry(jobject module, TRAPS) {
100 oop m = JNIHandles::resolve_non_null(module);
101 if (!java_lang_Module::is_instance(m)) {
102 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
103 "module is not an instance of type java.lang.Module");
104 }
105 return java_lang_Module::module_entry(m);
106 }
107
108
109 static PackageEntry* get_locked_package_entry(ModuleEntry* module_entry, const char* package_name, int len, TRAPS) {
110 assert(Module_lock->owned_by_self(), "should have the Module_lock");
111 assert(package_name != NULL, "Precondition");
112 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(package_name, len);
113 PackageEntryTable* package_entry_table = module_entry->loader_data()->packages();
114 assert(package_entry_table != NULL, "Unexpected null package entry table");
115 PackageEntry* package_entry = package_entry_table->locked_lookup_only(pkg_symbol);
116 assert(package_entry == NULL || package_entry->module() == module_entry, "Unexpectedly found a package linked to another module");
117 return package_entry;
118 }
119
120 static PackageEntry* get_package_entry_by_name(Symbol* package,
121 Handle h_loader,
122 TRAPS) {
123 if (package != NULL) {
124 PackageEntryTable* const package_entry_table =
125 get_package_entry_table(h_loader);
126 assert(package_entry_table != NULL, "Unexpected null package entry table");
127 return package_entry_table->lookup_only(package);
128 }
129 return NULL;
130 }
131
132 bool Modules::is_package_defined(Symbol* package, Handle h_loader, TRAPS) {
133 PackageEntry* res = get_package_entry_by_name(package, h_loader, CHECK_false);
134 return res != NULL;
135 }
136
137 // Converts the String oop to an internal package
138 // Will use the provided buffer if it's sufficiently large, otherwise allocates
139 // a resource array
140 // The length of the resulting string will be assigned to utf8_len
141 static const char* as_internal_package(oop package_string, char* buf, int buflen, int& utf8_len) {
142 char* package_name = java_lang_String::as_utf8_string_full(package_string, buf, buflen, utf8_len);
143
144 // Turn all '/'s into '.'s
145 for (int index = 0; index < utf8_len; index++) {
146 if (package_name[index] == JVM_SIGNATURE_DOT) {
147 package_name[index] = JVM_SIGNATURE_SLASH;
148 }
149 }
150 return package_name;
151 }
152
153 static void define_javabase_module(Handle module_handle, jstring version, jstring location,
154 objArrayHandle pkgs, int num_packages, TRAPS) {
155 ResourceMark rm(THREAD);
156
157 // Obtain java.base's module version
158 TempNewSymbol version_symbol = as_symbol(version);
159
160 // Obtain java.base's location
161 TempNewSymbol location_symbol = as_symbol(location);
162
163 // Check that the packages are syntactically ok.
164 char buf[128];
165 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
166 for (int x = 0; x < num_packages; x++) {
167 oop pkg_str = pkgs->obj_at(x);
168
169 if (pkg_str == NULL || pkg_str->klass() != SystemDictionary::String_klass()) {
170 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
171 err_msg("Bad package name"));
172 }
173
174 int package_len;
175 const char* package_name = as_internal_package(pkg_str, buf, sizeof(buf), package_len);
176 if (!verify_package_name(package_name, package_len)) {
177 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
178 err_msg("Invalid package name: %s for module: " JAVA_BASE_NAME, package_name));
179 }
180 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, package_len);
181 pkg_list->append(pkg_symbol);
182 }
183
184 // Validate java_base's loader is the boot loader.
185 oop loader = java_lang_Module::loader(module_handle());
186 if (loader != NULL) {
187 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
188 "Class loader must be the boot class loader");
189 }
190 Handle h_loader(THREAD, loader);
191
192 // Ensure the boot loader's PackageEntryTable has been created
193 PackageEntryTable* package_table = get_package_entry_table(h_loader);
194 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package_table");
195
196 // Ensure java.base's ModuleEntry has been created
197 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, "No ModuleEntry for " JAVA_BASE_NAME);
198
199 bool duplicate_javabase = false;
200 {
201 MutexLocker m1(THREAD, Module_lock);
202
203 if (ModuleEntryTable::javabase_defined()) {
204 duplicate_javabase = true;
205 } else {
206
207 // Verify that all java.base packages created during bootstrapping are in
208 // pkg_list. If any are not in pkg_list, than a non-java.base class was
209 // loaded erroneously pre java.base module definition.
210 package_table->verify_javabase_packages(pkg_list);
211
212 // loop through and add any new packages for java.base
213 for (int x = 0; x < pkg_list->length(); x++) {
214 // Some of java.base's packages were added early in bootstrapping, ignore duplicates.
215 package_table->locked_create_entry_if_not_exist(pkg_list->at(x),
216 ModuleEntryTable::javabase_moduleEntry());
217 assert(package_table->locked_lookup_only(pkg_list->at(x)) != NULL,
218 "Unable to create a " JAVA_BASE_NAME " package entry");
219 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
220 // the Symbol* that was created above for each package. The refcount was incremented
221 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
222 pkg_list->at(x)->decrement_refcount();
223 }
224
225 // Finish defining java.base's ModuleEntry
226 ModuleEntryTable::finalize_javabase(module_handle, version_symbol, location_symbol);
227 }
228 }
229 if (duplicate_javabase) {
230 THROW_MSG(vmSymbols::java_lang_InternalError(),
231 "Module " JAVA_BASE_NAME " is already defined");
232 }
233
234 // Only the thread that actually defined the base module will get here,
235 // so no locking is needed.
236
237 // Patch any previously loaded class's module field with java.base's java.lang.Module.
238 ModuleEntryTable::patch_javabase_entries(module_handle);
239
240 log_info(module, load)(JAVA_BASE_NAME " location: %s",
241 location_symbol != NULL ? location_symbol->as_C_string() : "NULL");
242 log_debug(module)("define_javabase_module(): Definition of module: "
243 JAVA_BASE_NAME ", version: %s, location: %s, package #: %d",
244 version_symbol != NULL ? version_symbol->as_C_string() : "NULL",
245 location_symbol != NULL ? location_symbol->as_C_string() : "NULL",
246 pkg_list->length());
247
248 // packages defined to java.base
249 if (log_is_enabled(Trace, module)) {
250 for (int x = 0; x < pkg_list->length(); x++) {
251 log_trace(module)("define_javabase_module(): creation of package %s for module " JAVA_BASE_NAME,
252 (pkg_list->at(x))->as_C_string());
253 }
254 }
255 }
256
257 // Caller needs ResourceMark.
258 void throw_dup_pkg_exception(const char* module_name, PackageEntry* package, TRAPS) {
259 const char* package_name = package->name()->as_C_string();
260 if (package->module()->is_named()) {
261 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
262 err_msg("Package %s for module %s is already in another module, %s, defined to the class loader",
263 package_name, module_name, package->module()->name()->as_C_string()));
264 } else {
265 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
266 err_msg("Package %s for module %s is already in the unnamed module defined to the class loader",
267 package_name, module_name));
268 }
269 }
270
271 void Modules::define_module(jobject module, jboolean is_open, jstring version,
272 jstring location, jobjectArray packages, TRAPS) {
273 ResourceMark rm(THREAD);
274
275 if (module == NULL) {
276 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
277 }
278
279 Handle module_handle(THREAD, JNIHandles::resolve_non_null(module));
280 if (!java_lang_Module::is_instance(module_handle())) {
281 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
282 "module is not an instance of type java.lang.Module");
283 }
284
285 int module_name_len;
286 char* module_name = get_module_name(module_handle(), module_name_len, CHECK);
287 if (module_name == NULL) {
288 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
289 "Module name cannot be null");
290 }
291
292 // Resolve packages
293 objArrayHandle packages_h(THREAD, objArrayOop(JNIHandles::resolve(packages)));
294 int num_packages = (packages_h.is_null() ? 0 : packages_h->length());
295
296 // Special handling of java.base definition
297 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
298 assert(is_open == JNI_FALSE, "java.base module cannot be open");
299 define_javabase_module(module_handle, version, location, packages_h, num_packages, CHECK);
300 return;
301 }
302
303 oop loader = java_lang_Module::loader(module_handle());
304 // Make sure loader is not the jdk.internal.reflect.DelegatingClassLoader.
305 if (loader != java_lang_ClassLoader::non_reflection_class_loader(loader)) {
306 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
307 "Class loader is an invalid delegating class loader");
308 }
309 Handle h_loader = Handle(THREAD, loader);
310 // define_module can be called during start-up, before the class loader's ClassLoaderData
311 // has been created. SystemDictionary::register_loader ensures creation, if needed.
312 ClassLoaderData* loader_data = SystemDictionary::register_loader(h_loader);
313 assert(loader_data != NULL, "class loader data shouldn't be null");
314
315 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
316 bool java_pkg_disallowed = !h_loader.is_null() &&
317 !SystemDictionary::is_platform_class_loader(h_loader());
318
319 // Check that the list of packages has no duplicates and that the
320 // packages are syntactically ok.
321 char buf[128];
322 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
323 for (int x = 0; x < num_packages; x++) {
324 oop pkg_str = packages_h->obj_at(x);
325 if (pkg_str == NULL || pkg_str->klass() != SystemDictionary::String_klass()) {
326 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
327 err_msg("Bad package name"));
328 }
329
330 int package_len;
331 const char* package_name = as_internal_package(pkg_str, buf, sizeof(buf), package_len);
332 if (!verify_package_name(package_name, package_len)) {
333 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
334 err_msg("Invalid package name: %s for module: %s",
335 package_name, module_name));
336 }
337
338 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
339 if (java_pkg_disallowed &&
340 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&
341 (package_name[JAVAPKG_LEN] == JVM_SIGNATURE_SLASH || package_name[JAVAPKG_LEN] == '\0'))) {
342 const char* class_loader_name = loader_data->loader_name_and_id();
343 size_t pkg_len = strlen(package_name);
344 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len + 1);
345 strncpy(pkg_name, package_name, pkg_len + 1);
346 StringUtils::replace_no_expand(pkg_name, "/", ".");
347 const char* msg_text1 = "Class loader (instance of): ";
348 const char* msg_text2 = " tried to define prohibited package name: ";
349 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;
350 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
351 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);
352 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);
353 }
354
355 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, package_len);
356 pkg_list->append(pkg_symbol);
357 }
358
359 ModuleEntryTable* module_table = get_module_entry_table(h_loader);
360 assert(module_table != NULL, "module entry table shouldn't be null");
361
362 // Create symbol* entry for module name.
363 TempNewSymbol module_symbol = SymbolTable::new_symbol(module_name, module_name_len);
364
365 bool dupl_modules = false;
366
367 // Create symbol for module version.
368 TempNewSymbol version_symbol = as_symbol(version);
369
370 // Create symbol* entry for module location.
371 TempNewSymbol location_symbol = as_symbol(location);
372
373 PackageEntryTable* package_table = NULL;
374 PackageEntry* existing_pkg = NULL;
375 {
376 MutexLocker ml(THREAD, Module_lock);
377
378 if (num_packages > 0) {
379 package_table = get_package_entry_table(h_loader);
380 assert(package_table != NULL, "Missing package_table");
381
382 // Check that none of the packages exist in the class loader's package table.
383 for (int x = 0; x < pkg_list->length(); x++) {
384 existing_pkg = package_table->locked_lookup_only(pkg_list->at(x));
385 if (existing_pkg != NULL) {
386 // This could be because the module was already defined. If so,
387 // report that error instead of the package error.
388 if (module_table->lookup_only(module_symbol) != NULL) {
389 dupl_modules = true;
390 }
391 break;
392 }
393 }
394 } // if (num_packages > 0)...
395
396 // Add the module and its packages.
397 if (!dupl_modules && existing_pkg == NULL) {
398 if (module_table->lookup_only(module_symbol) == NULL) {
399 // Create the entry for this module in the class loader's module entry table.
400 ModuleEntry* module_entry = module_table->locked_create_entry(module_handle,
401 (is_open == JNI_TRUE), module_symbol,
402 version_symbol, location_symbol, loader_data);
403 assert(module_entry != NULL, "module_entry creation failed");
404
405 // Add the packages.
406 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package table");
407 for (int y = 0; y < pkg_list->length(); y++) {
408 package_table->locked_create_entry(pkg_list->at(y), module_entry);
409
410 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
411 // the Symbol* that was created above for each package. The refcount was incremented
412 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
413 pkg_list->at(y)->decrement_refcount();
414 }
415
416 // Store pointer to ModuleEntry record in java.lang.Module object.
417 java_lang_Module::set_module_entry(module_handle(), module_entry);
418 } else {
419 dupl_modules = true;
420 }
421 }
422 } // Release the lock
423
424 // any errors ?
425 if (dupl_modules) {
426 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
427 err_msg("Module %s is already defined", module_name));
428 } else if (existing_pkg != NULL) {
429 throw_dup_pkg_exception(module_name, existing_pkg, CHECK);
430 }
431
432 log_info(module, load)("%s location: %s", module_name,
433 location_symbol != NULL ? location_symbol->as_C_string() : "NULL");
434 LogTarget(Debug, module) lt;
435 if (lt.is_enabled()) {
436 LogStream ls(lt);
437 ls.print("define_module(): creation of module: %s, version: %s, location: %s, ",
438 module_name, version_symbol != NULL ? version_symbol->as_C_string() : "NULL",
439 location_symbol != NULL ? location_symbol->as_C_string() : "NULL");
440 loader_data->print_value_on(&ls);
441 ls.print_cr(", package #: %d", pkg_list->length());
442 for (int y = 0; y < pkg_list->length(); y++) {
443 log_trace(module)("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 to the system boot class path.
450 if (h_loader.is_null() && !ClassLoader::has_jrt_entry()) {
451 ClassLoader::add_to_exploded_build_list(module_symbol, CHECK);
452 }
453 }
454
455 #if INCLUDE_CDS_JAVA_HEAP
456 void Modules::define_archived_modules(jobject platform_loader, jobject system_loader, TRAPS) {
457 if (platform_loader == NULL) {
458 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null platform loader object");
459 }
460
461 if (system_loader == NULL) {
462 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null system loader object");
463 }
464
465 if (UseSharedSpaces && MetaspaceShared::use_full_module_graph()) {
466 Handle h_platform_loader(THREAD, JNIHandles::resolve_non_null(platform_loader));
467 ClassLoaderData* platform_loader_data = SystemDictionary::register_loader(h_platform_loader);
468 ClassLoaderDataShared::restore_java_platform_loader_from_archive(platform_loader_data);
469
470 Handle h_system_loader(THREAD, JNIHandles::resolve_non_null(system_loader));
471 ClassLoaderData* system_loader_data = SystemDictionary::register_loader(h_system_loader);
472 ClassLoaderDataShared::restore_java_system_loader_from_archive(system_loader_data);
473 }
474 }
475 #endif
476
477 void Modules::set_bootloader_unnamed_module(jobject module, TRAPS) {
478 ResourceMark rm(THREAD);
479
480 if (module == NULL) {
481 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
482 }
483 Handle module_handle(THREAD, JNIHandles::resolve(module));
484 if (!java_lang_Module::is_instance(module_handle())) {
485 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
486 "module is not an instance of type java.lang.Module");
487 }
488
489 // Ensure that this is an unnamed module
490 oop name = java_lang_Module::name(module_handle());
491 if (name != NULL) {
492 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
493 "boot loader's unnamed module's java.lang.Module has a name");
494 }
495
496 // Validate java_base's loader is the boot loader.
497 oop loader = java_lang_Module::loader(module_handle());
498 if (loader != NULL) {
499 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
500 "Class loader must be the boot class loader");
501 }
502
503 log_debug(module)("set_bootloader_unnamed_module(): recording unnamed module for boot loader");
504
505 // Set java.lang.Module for the boot loader's unnamed module
506 ClassLoaderData* boot_loader_data = ClassLoaderData::the_null_class_loader_data();
507 ModuleEntry* unnamed_module = boot_loader_data->unnamed_module();
508 assert(unnamed_module != NULL, "boot loader's unnamed ModuleEntry not defined");
509 unnamed_module->set_module(boot_loader_data->add_handle(module_handle));
510 // Store pointer to the ModuleEntry in the unnamed module's java.lang.Module object.
511 java_lang_Module::set_module_entry(module_handle(), unnamed_module);
512 }
513
514 void Modules::add_module_exports(jobject from_module, jstring package_name, jobject to_module, TRAPS) {
515
516 if (package_name == NULL) {
517 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
518 "package is null");
519 }
520 if (from_module == NULL) {
521 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
522 "from_module is null");
523 }
524 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
525 if (from_module_entry == NULL) {
526 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
527 "from_module cannot be found");
528 }
529
530 // All packages in unnamed and open modules are exported by default.
531 if (!from_module_entry->is_named() || from_module_entry->is_open()) return;
532
533 ModuleEntry* to_module_entry;
534 if (to_module == NULL) {
535 to_module_entry = NULL; // It's an unqualified export.
536 } else {
537 to_module_entry = get_module_entry(to_module, CHECK);
538 if (to_module_entry == NULL) {
539 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
540 "to_module is invalid");
541 }
542 }
543
544 PackageEntry* package_entry = NULL;
545 char buf[128];
546 int package_len;
547
548 ResourceMark rm(THREAD);
549 const char* pkg = as_internal_package(JNIHandles::resolve_non_null(package_name), buf, sizeof(buf), package_len);
550 {
551 MutexLocker ml(THREAD, Module_lock);
552 package_entry = get_locked_package_entry(from_module_entry, pkg, package_len, CHECK);
553 // Do nothing if modules are the same
554 // If the package is not found we'll throw an exception later
555 if (from_module_entry != to_module_entry &&
556 package_entry != NULL) {
557 package_entry->set_exported(to_module_entry);
558 }
559 }
560
561 // Handle errors and logging outside locked section
562 if (package_entry == NULL) {
563 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
564 err_msg("Package %s not found in from_module %s",
565 pkg != NULL ? pkg : "",
566 from_module_entry->name()->as_C_string()));
567 }
568
569 if (log_is_enabled(Debug, module)) {
570 log_debug(module)("add_module_exports(): package %s in module %s is exported to module %s",
571 package_entry->name()->as_C_string(),
572 from_module_entry->name()->as_C_string(),
573 to_module_entry == NULL ? "NULL" :
574 to_module_entry->is_named() ?
575 to_module_entry->name()->as_C_string() : UNNAMED_MODULE);
576 }
577 }
578
579
580 void Modules::add_module_exports_qualified(jobject from_module, jstring package,
581 jobject to_module, TRAPS) {
582 if (to_module == NULL) {
583 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
584 "to_module is null");
585 }
586 add_module_exports(from_module, package, to_module, CHECK);
587 }
588
589 void Modules::add_reads_module(jobject from_module, jobject to_module, TRAPS) {
590 if (from_module == NULL) {
591 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
592 "from_module is null");
593 }
594
595 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
596 if (from_module_entry == NULL) {
597 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
598 "from_module is not valid");
599 }
600
601 ModuleEntry* to_module_entry;
602 if (to_module != NULL) {
603 to_module_entry = get_module_entry(to_module, CHECK);
604 if (to_module_entry == NULL) {
605 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
606 "to_module is invalid");
607 }
608 } else {
609 to_module_entry = NULL;
610 }
611
612 ResourceMark rm(THREAD);
613 log_debug(module)("add_reads_module(): Adding read from module %s to module %s",
614 from_module_entry->is_named() ?
615 from_module_entry->name()->as_C_string() : UNNAMED_MODULE,
616 to_module_entry == NULL ? "all unnamed" :
617 (to_module_entry->is_named() ?
618 to_module_entry->name()->as_C_string() : UNNAMED_MODULE));
619
620 // if modules are the same or if from_module is unnamed then no need to add the read.
621 if (from_module_entry != to_module_entry && from_module_entry->is_named()) {
622 from_module_entry->add_read(to_module_entry);
623 }
624 }
625
626 // This method is called by JFR and JNI.
627 jobject Modules::get_module(jclass clazz, TRAPS) {
628 assert(ModuleEntryTable::javabase_defined(),
629 "Attempt to call get_module before " JAVA_BASE_NAME " is defined");
630
631 if (clazz == NULL) {
632 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
633 "class is null", JNI_FALSE);
634 }
635 oop mirror = JNIHandles::resolve_non_null(clazz);
636 if (mirror == NULL) {
637 log_debug(module)("get_module(): no mirror, returning NULL");
638 return NULL;
639 }
640 if (!java_lang_Class::is_instance(mirror)) {
641 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
642 "Invalid class", JNI_FALSE);
643 }
644
645 oop module = java_lang_Class::module(mirror);
646
647 assert(module != NULL, "java.lang.Class module field not set");
648 assert(java_lang_Module::is_instance(module), "module is not an instance of type java.lang.Module");
649
650 LogTarget(Debug,module) lt;
651 if (lt.is_enabled()) {
652 ResourceMark rm(THREAD);
653 LogStream ls(lt);
654 Klass* klass = java_lang_Class::as_Klass(mirror);
655 oop module_name = java_lang_Module::name(module);
656 if (module_name != NULL) {
657 ls.print("get_module(): module ");
658 java_lang_String::print(module_name, tty);
659 } else {
660 ls.print("get_module(): Unamed Module");
661 }
662 if (klass != NULL) {
663 ls.print_cr(" for class %s", klass->external_name());
664 } else {
665 ls.print_cr(" for primitive class");
666 }
667 }
668
669 return JNIHandles::make_local(THREAD, module);
670 }
671
672 jobject Modules::get_named_module(Handle h_loader, const char* package_name, TRAPS) {
673 assert(ModuleEntryTable::javabase_defined(),
674 "Attempt to call get_named_module before " JAVA_BASE_NAME " is defined");
675 assert(h_loader.is_null() || java_lang_ClassLoader::is_subclass(h_loader->klass()),
676 "Class loader is not a subclass of java.lang.ClassLoader");
677 assert(package_name != NULL, "the package_name should not be NULL");
678
679 if (strlen(package_name) == 0) {
680 return NULL;
681 }
682 TempNewSymbol package_sym = SymbolTable::new_symbol(package_name);
683 const PackageEntry* const pkg_entry =
684 get_package_entry_by_name(package_sym, h_loader, THREAD);
685 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
686
687 if (module_entry != NULL && module_entry->module() != NULL && module_entry->is_named()) {
688 return JNIHandles::make_local(THREAD, module_entry->module());
689 }
690 return NULL;
691 }
692
693 // Export package in module to all unnamed modules.
694 void Modules::add_module_exports_to_all_unnamed(jobject module, jstring package_name, TRAPS) {
695 if (module == NULL) {
696 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
697 "module is null");
698 }
699 if (package_name == NULL) {
700 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
701 "package is null");
702 }
703 ModuleEntry* module_entry = get_module_entry(module, CHECK);
704 if (module_entry == NULL) {
705 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
706 "module is invalid");
707 }
708
709 // No-op for unnamed module and open modules
710 if (!module_entry->is_named() || module_entry->is_open())
711 return;
712
713 ResourceMark rm(THREAD);
714 char buf[128];
715 int pkg_len;
716 const char* pkg = as_internal_package(JNIHandles::resolve_non_null(package_name), buf, sizeof(buf), pkg_len);
717 PackageEntry* package_entry = NULL;
718 {
719 MutexLocker m1(THREAD, Module_lock);
720 package_entry = get_locked_package_entry(module_entry, pkg, pkg_len, CHECK);
721
722 // Mark package as exported to all unnamed modules.
723 if (package_entry != NULL) {
724 package_entry->set_is_exported_allUnnamed();
725 }
726 }
727
728 // Handle errors and logging outside locked section
729 if (package_entry == NULL) {
730 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
731 err_msg("Package %s not found in module %s",
732 pkg != NULL ? pkg : "",
733 module_entry->name()->as_C_string()));
734 }
735
736 if (log_is_enabled(Debug, module)) {
737 log_debug(module)("add_module_exports_to_all_unnamed(): package %s in module"
738 " %s is exported to all unnamed modules",
739 package_entry->name()->as_C_string(),
740 module_entry->name()->as_C_string());
741 }
742 }