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 "prims/jvmtiExport.hpp"
46 #include "runtime/handles.inline.hpp"
47 #include "runtime/javaCalls.hpp"
48 #include "runtime/jniHandles.inline.hpp"
49 #include "utilities/stringUtils.hpp"
50 #include "utilities/utf8.hpp"
51
52 static bool verify_module_name(const char *module_name, int len) {
53 assert(module_name != NULL, "invariant");
54 return (len > 0 && len <= Symbol::max_length());
55 }
56
57 static bool verify_package_name(const char* package_name, int len) {
58 assert(package_name != NULL, "Package name derived from non-null jstring can't be NULL");
59 return (len > 0 && len <= Symbol::max_length() &&
60 ClassFileParser::verify_unqualified_name(package_name, len,
61 ClassFileParser::LegalClass));
62 }
63
64 static char* get_module_name(oop module, int& len, TRAPS) {
65 oop name_oop = java_lang_Module::name(module);
66 if (name_oop == NULL) {
67 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(), "Null module name");
68 }
69 char* module_name = java_lang_String::as_utf8_string(name_oop, len);
70 if (!verify_module_name(module_name, len)) {
71 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
72 err_msg("Invalid module name: %s", module_name));
73 }
74 return module_name;
75 }
76
77 static Symbol* as_symbol(jstring str_object) {
78 if (str_object == NULL) {
79 return NULL;
80 }
81 int len;
82 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(str_object), len);
83 return SymbolTable::new_symbol(str, len);
84 }
85
86 ModuleEntryTable* Modules::get_module_entry_table(Handle h_loader) {
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);
90 return loader_cld->modules();
91 }
92
93 static PackageEntryTable* get_package_entry_table(Handle h_loader) {
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);
97 return loader_cld->packages();
98 }
99
100 static ModuleEntry* get_module_entry(jobject module, TRAPS) {
101 oop m = JNIHandles::resolve_non_null(module);
102 if (!java_lang_Module::is_instance(m)) {
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(m);
107 }
108
109
110 static PackageEntry* get_locked_package_entry(ModuleEntry* module_entry, const char* package_name, int len, TRAPS) {
111 assert(Module_lock->owned_by_self(), "should have the Module_lock");
112 assert(package_name != NULL, "Precondition");
113 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(package_name, len);
114 PackageEntryTable* package_entry_table = module_entry->loader_data()->packages();
115 assert(package_entry_table != NULL, "Unexpected null package entry table");
116 PackageEntry* package_entry = package_entry_table->locked_lookup_only(pkg_symbol);
117 assert(package_entry == NULL || package_entry->module() == module_entry, "Unexpectedly found a package linked to another module");
118 return package_entry;
119 }
120
121 static PackageEntry* get_package_entry_by_name(Symbol* package,
122 Handle h_loader,
123 TRAPS) {
124 if (package != NULL) {
125 PackageEntryTable* const package_entry_table =
126 get_package_entry_table(h_loader);
127 assert(package_entry_table != NULL, "Unexpected null package entry table");
128 return package_entry_table->lookup_only(package);
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 // Converts the String oop to an internal package
139 // Will use the provided buffer if it's sufficiently large, otherwise allocates
140 // a resource array
141 // The length of the resulting string will be assigned to utf8_len
142 static const char* as_internal_package(oop package_string, char* buf, int buflen, int& utf8_len) {
143 char* package_name = java_lang_String::as_utf8_string_full(package_string, buf, buflen, utf8_len);
144
145 // Turn all '/'s into '.'s
146 for (int index = 0; index < utf8_len; index++) {
147 if (package_name[index] == JVM_SIGNATURE_DOT) {
148 package_name[index] = JVM_SIGNATURE_SLASH;
149 }
150 }
151 return package_name;
152 }
153
154 static void define_javabase_module(Handle module_handle, jstring version, jstring location,
155 objArrayHandle pkgs, int num_packages, TRAPS) {
156 ResourceMark rm(THREAD);
157
158 // Obtain java.base's module version
159 TempNewSymbol version_symbol = as_symbol(version);
160
161 // Obtain java.base's location
162 TempNewSymbol location_symbol = as_symbol(location);
163
164 // Check that the packages are syntactically ok.
165 char buf[128];
166 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
167 for (int x = 0; x < num_packages; x++) {
168 oop pkg_str = pkgs->obj_at(x);
169
170 if (pkg_str == NULL || pkg_str->klass() != SystemDictionary::String_klass()) {
171 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
172 err_msg("Bad package name"));
173 }
174
175 int package_len;
176 const char* package_name = as_internal_package(pkg_str, buf, sizeof(buf), package_len);
177 if (!verify_package_name(package_name, package_len)) {
178 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
179 err_msg("Invalid package name: %s for module: " JAVA_BASE_NAME, package_name));
180 }
181 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, package_len);
182 pkg_list->append(pkg_symbol);
183 }
184
185 // Validate java_base's loader is the boot loader.
186 oop loader = java_lang_Module::loader(module_handle());
187 if (loader != NULL) {
188 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
189 "Class loader must be the boot class loader");
190 }
191 Handle h_loader(THREAD, loader);
192
193 // Ensure the boot loader's PackageEntryTable has been created
194 PackageEntryTable* package_table = get_package_entry_table(h_loader);
195 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package_table");
196
197 // Ensure java.base's ModuleEntry has been created
198 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, "No ModuleEntry for " JAVA_BASE_NAME);
199
200 bool duplicate_javabase = false;
201 {
202 MutexLocker m1(THREAD, Module_lock);
203
204 if (ModuleEntryTable::javabase_defined()) {
205 duplicate_javabase = true;
206 } else {
207
208 // Verify that all java.base packages created during bootstrapping are in
209 // pkg_list. If any are not in pkg_list, than a non-java.base class was
210 // loaded erroneously pre java.base module definition.
211 package_table->verify_javabase_packages(pkg_list);
212
213 // loop through and add any new packages for java.base
214 for (int x = 0; x < pkg_list->length(); x++) {
215 // Some of java.base's packages were added early in bootstrapping, ignore duplicates.
216 package_table->locked_create_entry_if_not_exist(pkg_list->at(x),
217 ModuleEntryTable::javabase_moduleEntry());
218 assert(package_table->locked_lookup_only(pkg_list->at(x)) != NULL,
219 "Unable to create a " JAVA_BASE_NAME " package entry");
220 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
221 // the Symbol* that was created above for each package. The refcount was incremented
222 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
223 pkg_list->at(x)->decrement_refcount();
224 }
225
226 // Finish defining java.base's ModuleEntry
227 ModuleEntryTable::finalize_javabase(module_handle, version_symbol, location_symbol);
228 }
229 }
230 if (duplicate_javabase) {
231 THROW_MSG(vmSymbols::java_lang_InternalError(),
232 "Module " JAVA_BASE_NAME " is already defined");
233 }
234
235 // Only the thread that actually defined the base module will get here,
236 // so no locking is needed.
237
238 // Patch any previously loaded class's module field with java.base's java.lang.Module.
239 ModuleEntryTable::patch_javabase_entries(module_handle);
240
241 log_info(module, load)(JAVA_BASE_NAME " location: %s",
242 location_symbol != NULL ? location_symbol->as_C_string() : "NULL");
243 log_debug(module)("define_javabase_module(): Definition of module: "
244 JAVA_BASE_NAME ", version: %s, location: %s, package #: %d",
245 version_symbol != NULL ? version_symbol->as_C_string() : "NULL",
246 location_symbol != NULL ? location_symbol->as_C_string() : "NULL",
247 pkg_list->length());
248
249 // packages defined to java.base
250 if (log_is_enabled(Trace, module)) {
251 for (int x = 0; x < pkg_list->length(); x++) {
252 log_trace(module)("define_javabase_module(): creation of package %s for module " JAVA_BASE_NAME,
253 (pkg_list->at(x))->as_C_string());
254 }
255 }
256 }
257
258 // Caller needs ResourceMark.
259 void throw_dup_pkg_exception(const char* module_name, PackageEntry* package, TRAPS) {
260 const char* package_name = package->name()->as_C_string();
261 if (package->module()->is_named()) {
262 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
263 err_msg("Package %s for module %s is already in another module, %s, defined to the class loader",
264 package_name, module_name, package->module()->name()->as_C_string()));
265 } else {
266 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
267 err_msg("Package %s for module %s is already in the unnamed module defined to the class loader",
268 package_name, module_name));
269 }
270 }
271
272 void Modules::define_module(jobject module, jboolean is_open, jstring version,
273 jstring location, jobjectArray packages, TRAPS) {
274 check_cds_restrictions(CHECK);
275 ResourceMark rm(THREAD);
276
277 if (module == NULL) {
278 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
279 }
280
281 Handle module_handle(THREAD, JNIHandles::resolve_non_null(module));
282 if (!java_lang_Module::is_instance(module_handle())) {
283 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
284 "module is not an instance of type java.lang.Module");
285 }
286
287 int module_name_len;
288 char* module_name = get_module_name(module_handle(), module_name_len, CHECK);
289 if (module_name == NULL) {
290 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
291 "Module name cannot be null");
292 }
293
294 // Resolve packages
295 objArrayHandle packages_h(THREAD, objArrayOop(JNIHandles::resolve(packages)));
296 int num_packages = (packages_h.is_null() ? 0 : packages_h->length());
297
298 // Special handling of java.base definition
299 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
300 assert(is_open == JNI_FALSE, "java.base module cannot be open");
301 define_javabase_module(module_handle, version, location, packages_h, num_packages, CHECK);
302 return;
303 }
304
305 oop loader = java_lang_Module::loader(module_handle());
306 // Make sure loader is not the jdk.internal.reflect.DelegatingClassLoader.
307 if (loader != java_lang_ClassLoader::non_reflection_class_loader(loader)) {
308 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
309 "Class loader is an invalid delegating class loader");
310 }
311 Handle h_loader = Handle(THREAD, loader);
312 // define_module can be called during start-up, before the class loader's ClassLoaderData
313 // has been created. SystemDictionary::register_loader ensures creation, if needed.
314 ClassLoaderData* loader_data = SystemDictionary::register_loader(h_loader);
315 assert(loader_data != NULL, "class loader data shouldn't be null");
316
317 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
318 bool java_pkg_disallowed = !h_loader.is_null() &&
319 !SystemDictionary::is_platform_class_loader(h_loader());
320
321 // Check that the list of packages has no duplicates and that the
322 // packages are syntactically ok.
323 char buf[128];
324 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
325 for (int x = 0; x < num_packages; x++) {
326 oop pkg_str = packages_h->obj_at(x);
327 if (pkg_str == NULL || pkg_str->klass() != SystemDictionary::String_klass()) {
328 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
329 err_msg("Bad package name"));
330 }
331
332 int package_len;
333 const char* package_name = as_internal_package(pkg_str, buf, sizeof(buf), package_len);
334 if (!verify_package_name(package_name, package_len)) {
335 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
336 err_msg("Invalid package name: %s for module: %s",
337 package_name, module_name));
338 }
339
340 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
341 if (java_pkg_disallowed &&
342 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&
343 (package_name[JAVAPKG_LEN] == JVM_SIGNATURE_SLASH || package_name[JAVAPKG_LEN] == '\0'))) {
344 const char* class_loader_name = loader_data->loader_name_and_id();
345 size_t pkg_len = strlen(package_name);
346 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len + 1);
347 strncpy(pkg_name, package_name, pkg_len + 1);
348 StringUtils::replace_no_expand(pkg_name, "/", ".");
349 const char* msg_text1 = "Class loader (instance of): ";
350 const char* msg_text2 = " tried to define prohibited package name: ";
351 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;
352 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
353 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);
354 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);
355 }
356
357 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, package_len);
358 pkg_list->append(pkg_symbol);
359 }
360
361 ModuleEntryTable* module_table = get_module_entry_table(h_loader);
362 assert(module_table != NULL, "module entry table shouldn't be null");
363
364 // Create symbol* entry for module name.
365 TempNewSymbol module_symbol = SymbolTable::new_symbol(module_name, module_name_len);
366
367 bool dupl_modules = false;
368
369 // Create symbol for module version.
370 TempNewSymbol version_symbol = as_symbol(version);
371
372 // Create symbol* entry for module location.
373 TempNewSymbol location_symbol = as_symbol(location);
374
375 PackageEntryTable* package_table = NULL;
376 PackageEntry* existing_pkg = NULL;
377 {
378 MutexLocker ml(THREAD, Module_lock);
379
380 if (num_packages > 0) {
381 package_table = get_package_entry_table(h_loader);
382 assert(package_table != NULL, "Missing package_table");
383
384 // Check that none of the packages exist in the class loader's package table.
385 for (int x = 0; x < pkg_list->length(); x++) {
386 existing_pkg = package_table->locked_lookup_only(pkg_list->at(x));
387 if (existing_pkg != NULL) {
388 // This could be because the module was already defined. If so,
389 // report that error instead of the package error.
390 if (module_table->lookup_only(module_symbol) != NULL) {
391 dupl_modules = true;
392 }
393 break;
394 }
395 }
396 } // if (num_packages > 0)...
397
398 // Add the module and its packages.
399 if (!dupl_modules && existing_pkg == NULL) {
400 if (module_table->lookup_only(module_symbol) == NULL) {
401 // Create the entry for this module in the class loader's module entry table.
402 ModuleEntry* module_entry = module_table->locked_create_entry(module_handle,
403 (is_open == JNI_TRUE), module_symbol,
404 version_symbol, location_symbol, loader_data);
405 assert(module_entry != NULL, "module_entry creation failed");
406
407 // Add the packages.
408 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package table");
409 for (int y = 0; y < pkg_list->length(); y++) {
410 package_table->locked_create_entry(pkg_list->at(y), module_entry);
411
412 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
413 // the Symbol* that was created above for each package. The refcount was incremented
414 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
415 pkg_list->at(y)->decrement_refcount();
416 }
417
418 // Store pointer to ModuleEntry record in java.lang.Module object.
419 java_lang_Module::set_module_entry(module_handle(), module_entry);
420 } else {
421 dupl_modules = true;
422 }
423 }
424 } // Release the lock
425
426 // any errors ?
427 if (dupl_modules) {
428 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
429 err_msg("Module %s is already defined", module_name));
430 } else if (existing_pkg != NULL) {
431 throw_dup_pkg_exception(module_name, existing_pkg, CHECK);
432 }
433
434 log_info(module, load)("%s location: %s", module_name,
435 location_symbol != NULL ? location_symbol->as_C_string() : "NULL");
436 LogTarget(Debug, module) lt;
437 if (lt.is_enabled()) {
438 LogStream ls(lt);
439 ls.print("define_module(): creation of module: %s, version: %s, location: %s, ",
440 module_name, version_symbol != NULL ? version_symbol->as_C_string() : "NULL",
441 location_symbol != NULL ? location_symbol->as_C_string() : "NULL");
442 loader_data->print_value_on(&ls);
443 ls.print_cr(", package #: %d", pkg_list->length());
444 for (int y = 0; y < pkg_list->length(); y++) {
445 log_trace(module)("define_module(): creation of package %s for module %s",
446 (pkg_list->at(y))->as_C_string(), module_name);
447 }
448 }
449
450 // If the module is defined to the boot loader and an exploded build is being
451 // used, prepend <java.home>/modules/modules_name to the system boot class path.
452 if (h_loader.is_null() && !ClassLoader::has_jrt_entry()) {
453 ClassLoader::add_to_exploded_build_list(module_symbol, CHECK);
454 }
455 }
456
457 #if INCLUDE_CDS_JAVA_HEAP
458 void Modules::define_archived_modules(jobject platform_loader, jobject system_loader, TRAPS) {
459 assert(UseSharedSpaces && MetaspaceShared::use_full_module_graph(), "must be");
460
461 // We don't want the classes used by the archived full module graph to be redefined by JVMTI.
462 // Luckily, such classes are loaded in the JVMTI "early" phase, and CDS is disable if a JVMTI
463 // agent wants to redefine classes in this phase.
464 JVMTI_ONLY(assert(JvmtiExport::is_early_phase(), "must be"));
465 assert(!(JvmtiExport::should_post_class_file_load_hook() && JvmtiExport::has_early_class_hook_env()),
466 "CDS should be disabled if early class hooks are enabled");
467
468 Handle java_base_module(THREAD, ClassLoaderDataShared::restore_archived_oops_for_null_class_loader_data());
469 // Patch any previously loaded class's module field with java.base's java.lang.Module.
470 ModuleEntryTable::patch_javabase_entries(java_base_module);
471
472 if (platform_loader == NULL) {
473 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null platform loader object");
474 }
475
476 if (system_loader == NULL) {
477 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null system loader object");
478 }
479
480 Handle h_platform_loader(THREAD, JNIHandles::resolve_non_null(platform_loader));
481 ClassLoaderData* platform_loader_data = SystemDictionary::register_loader(h_platform_loader);
482 ClassLoaderDataShared::restore_java_platform_loader_from_archive(platform_loader_data);
483
484 Handle h_system_loader(THREAD, JNIHandles::resolve_non_null(system_loader));
485 ClassLoaderData* system_loader_data = SystemDictionary::register_loader(h_system_loader);
486 ClassLoaderDataShared::restore_java_system_loader_from_archive(system_loader_data);
487 }
488
489 void Modules::check_cds_restrictions(TRAPS) {
490 if (DumpSharedSpaces && Universe::is_module_initialized() && MetaspaceShared::use_full_module_graph()) {
491 THROW_MSG(vmSymbols::java_lang_UnsupportedOperationException(),
492 "During -Xshare:dump, module system cannot be modified after it's initialized");
493 }
494 }
495 #endif
496
497 void Modules::set_bootloader_unnamed_module(jobject module, TRAPS) {
498 ResourceMark rm(THREAD);
499
500 if (module == NULL) {
501 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
502 }
503 Handle module_handle(THREAD, JNIHandles::resolve(module));
504 if (!java_lang_Module::is_instance(module_handle())) {
505 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
506 "module is not an instance of type java.lang.Module");
507 }
508
509 // Ensure that this is an unnamed module
510 oop name = java_lang_Module::name(module_handle());
511 if (name != NULL) {
512 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
513 "boot loader's unnamed module's java.lang.Module has a name");
514 }
515
516 // Validate java_base's loader is the boot loader.
517 oop loader = java_lang_Module::loader(module_handle());
518 if (loader != NULL) {
519 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
520 "Class loader must be the boot class loader");
521 }
522
523 log_debug(module)("set_bootloader_unnamed_module(): recording unnamed module for boot loader");
524
525 // Set java.lang.Module for the boot loader's unnamed module
526 ClassLoaderData* boot_loader_data = ClassLoaderData::the_null_class_loader_data();
527 ModuleEntry* unnamed_module = boot_loader_data->unnamed_module();
528 assert(unnamed_module != NULL, "boot loader's unnamed ModuleEntry not defined");
529 unnamed_module->set_module(boot_loader_data->add_handle(module_handle));
530 // Store pointer to the ModuleEntry in the unnamed module's java.lang.Module object.
531 java_lang_Module::set_module_entry(module_handle(), unnamed_module);
532 }
533
534 void Modules::add_module_exports(jobject from_module, jstring package_name, jobject to_module, TRAPS) {
535 check_cds_restrictions(CHECK);
536
537 if (package_name == NULL) {
538 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
539 "package is null");
540 }
541 if (from_module == NULL) {
542 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
543 "from_module is null");
544 }
545 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
546 if (from_module_entry == NULL) {
547 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
548 "from_module cannot be found");
549 }
550
551 // All packages in unnamed and open modules are exported by default.
552 if (!from_module_entry->is_named() || from_module_entry->is_open()) return;
553
554 ModuleEntry* to_module_entry;
555 if (to_module == NULL) {
556 to_module_entry = NULL; // It's an unqualified export.
557 } else {
558 to_module_entry = get_module_entry(to_module, CHECK);
559 if (to_module_entry == NULL) {
560 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
561 "to_module is invalid");
562 }
563 }
564
565 PackageEntry* package_entry = NULL;
566 char buf[128];
567 int package_len;
568
569 ResourceMark rm(THREAD);
570 const char* pkg = as_internal_package(JNIHandles::resolve_non_null(package_name), buf, sizeof(buf), package_len);
571 {
572 MutexLocker ml(THREAD, Module_lock);
573 package_entry = get_locked_package_entry(from_module_entry, pkg, package_len, CHECK);
574 // Do nothing if modules are the same
575 // If the package is not found we'll throw an exception later
576 if (from_module_entry != to_module_entry &&
577 package_entry != NULL) {
578 package_entry->set_exported(to_module_entry);
579 }
580 }
581
582 // Handle errors and logging outside locked section
583 if (package_entry == NULL) {
584 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
585 err_msg("Package %s not found in from_module %s",
586 pkg != NULL ? pkg : "",
587 from_module_entry->name()->as_C_string()));
588 }
589
590 if (log_is_enabled(Debug, module)) {
591 log_debug(module)("add_module_exports(): package %s in module %s is exported to module %s",
592 package_entry->name()->as_C_string(),
593 from_module_entry->name()->as_C_string(),
594 to_module_entry == NULL ? "NULL" :
595 to_module_entry->is_named() ?
596 to_module_entry->name()->as_C_string() : UNNAMED_MODULE);
597 }
598 }
599
600
601 void Modules::add_module_exports_qualified(jobject from_module, jstring package,
602 jobject to_module, TRAPS) {
603 check_cds_restrictions(CHECK);
604 if (to_module == NULL) {
605 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
606 "to_module is null");
607 }
608 add_module_exports(from_module, package, to_module, CHECK);
609 }
610
611 void Modules::add_reads_module(jobject from_module, jobject to_module, TRAPS) {
612 check_cds_restrictions(CHECK);
613 if (from_module == NULL) {
614 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
615 "from_module is null");
616 }
617
618 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
619 if (from_module_entry == NULL) {
620 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
621 "from_module is not valid");
622 }
623
624 ModuleEntry* to_module_entry;
625 if (to_module != NULL) {
626 to_module_entry = get_module_entry(to_module, CHECK);
627 if (to_module_entry == NULL) {
628 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
629 "to_module is invalid");
630 }
631 } else {
632 to_module_entry = NULL;
633 }
634
635 ResourceMark rm(THREAD);
636 log_debug(module)("add_reads_module(): Adding read from module %s to module %s",
637 from_module_entry->is_named() ?
638 from_module_entry->name()->as_C_string() : UNNAMED_MODULE,
639 to_module_entry == NULL ? "all unnamed" :
640 (to_module_entry->is_named() ?
641 to_module_entry->name()->as_C_string() : UNNAMED_MODULE));
642
643 // if modules are the same or if from_module is unnamed then no need to add the read.
644 if (from_module_entry != to_module_entry && from_module_entry->is_named()) {
645 from_module_entry->add_read(to_module_entry);
646 }
647 }
648
649 // This method is called by JFR and JNI.
650 jobject Modules::get_module(jclass clazz, TRAPS) {
651 assert(ModuleEntryTable::javabase_defined(),
652 "Attempt to call get_module before " JAVA_BASE_NAME " is defined");
653
654 if (clazz == NULL) {
655 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
656 "class is null", JNI_FALSE);
657 }
658 oop mirror = JNIHandles::resolve_non_null(clazz);
659 if (mirror == NULL) {
660 log_debug(module)("get_module(): no mirror, returning NULL");
661 return NULL;
662 }
663 if (!java_lang_Class::is_instance(mirror)) {
664 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
665 "Invalid class", JNI_FALSE);
666 }
667
668 oop module = java_lang_Class::module(mirror);
669
670 assert(module != NULL, "java.lang.Class module field not set");
671 assert(java_lang_Module::is_instance(module), "module is not an instance of type java.lang.Module");
672
673 LogTarget(Debug,module) lt;
674 if (lt.is_enabled()) {
675 ResourceMark rm(THREAD);
676 LogStream ls(lt);
677 Klass* klass = java_lang_Class::as_Klass(mirror);
678 oop module_name = java_lang_Module::name(module);
679 if (module_name != NULL) {
680 ls.print("get_module(): module ");
681 java_lang_String::print(module_name, tty);
682 } else {
683 ls.print("get_module(): Unamed Module");
684 }
685 if (klass != NULL) {
686 ls.print_cr(" for class %s", klass->external_name());
687 } else {
688 ls.print_cr(" for primitive class");
689 }
690 }
691
692 return JNIHandles::make_local(THREAD, module);
693 }
694
695 jobject Modules::get_named_module(Handle h_loader, const char* package_name, TRAPS) {
696 assert(ModuleEntryTable::javabase_defined(),
697 "Attempt to call get_named_module before " JAVA_BASE_NAME " is defined");
698 assert(h_loader.is_null() || java_lang_ClassLoader::is_subclass(h_loader->klass()),
699 "Class loader is not a subclass of java.lang.ClassLoader");
700 assert(package_name != NULL, "the package_name should not be NULL");
701
702 if (strlen(package_name) == 0) {
703 return NULL;
704 }
705 TempNewSymbol package_sym = SymbolTable::new_symbol(package_name);
706 const PackageEntry* const pkg_entry =
707 get_package_entry_by_name(package_sym, h_loader, THREAD);
708 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
709
710 if (module_entry != NULL && module_entry->module() != NULL && module_entry->is_named()) {
711 return JNIHandles::make_local(THREAD, module_entry->module());
712 }
713 return NULL;
714 }
715
716 // Export package in module to all unnamed modules.
717 void Modules::add_module_exports_to_all_unnamed(jobject module, jstring package_name, TRAPS) {
718 check_cds_restrictions(CHECK);
719 if (module == NULL) {
720 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
721 "module is null");
722 }
723 if (package_name == NULL) {
724 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
725 "package is null");
726 }
727 ModuleEntry* module_entry = get_module_entry(module, CHECK);
728 if (module_entry == NULL) {
729 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
730 "module is invalid");
731 }
732
733 // No-op for unnamed module and open modules
734 if (!module_entry->is_named() || module_entry->is_open())
735 return;
736
737 ResourceMark rm(THREAD);
738 char buf[128];
739 int pkg_len;
740 const char* pkg = as_internal_package(JNIHandles::resolve_non_null(package_name), buf, sizeof(buf), pkg_len);
741 PackageEntry* package_entry = NULL;
742 {
743 MutexLocker m1(THREAD, Module_lock);
744 package_entry = get_locked_package_entry(module_entry, pkg, pkg_len, CHECK);
745
746 // Mark package as exported to all unnamed modules.
747 if (package_entry != NULL) {
748 package_entry->set_is_exported_allUnnamed();
749 }
750 }
751
752 // Handle errors and logging outside locked section
753 if (package_entry == NULL) {
754 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
755 err_msg("Package %s not found in module %s",
756 pkg != NULL ? pkg : "",
757 module_entry->name()->as_C_string()));
758 }
759
760 if (log_is_enabled(Debug, module)) {
761 log_debug(module)("add_module_exports_to_all_unnamed(): package %s in module"
762 " %s is exported to all unnamed modules",
763 package_entry->name()->as_C_string(),
764 module_entry->name()->as_C_string());
765 }
766 }