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/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 "runtime/handles.inline.hpp"
44 #include "runtime/javaCalls.hpp"
45 #include "runtime/jniHandles.inline.hpp"
46 #include "utilities/stringUtils.hpp"
47 #include "utilities/utf8.hpp"
48
49 static bool verify_module_name(const char *module_name, int len) {
50 assert(module_name != NULL, "invariant");
51 return (len > 0 && len <= Symbol::max_length());
52 }
53
54 static bool verify_package_name(const char* package_name, int len) {
55 assert(package_name != NULL, "Package name derived from non-null jstring can't be NULL");
56 return (len > 0 && len <= Symbol::max_length() &&
57 ClassFileParser::verify_unqualified_name(package_name, len,
58 ClassFileParser::LegalClass));
59 }
60
61 static char* get_module_name(oop module, int& len, TRAPS) {
62 oop name_oop = java_lang_Module::name(module);
63 if (name_oop == NULL) {
64 THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(), "Null module name");
65 }
66 char* module_name = java_lang_String::as_utf8_string(name_oop, len);
67 if (!verify_module_name(module_name, len)) {
68 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
69 err_msg("Invalid module name: %s", module_name));
70 }
71 return module_name;
72 }
73
74 static Symbol* as_symbol(jstring str_object) {
75 if (str_object == NULL) {
76 return NULL;
77 }
78 int len;
79 char* str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(str_object), len);
80 return SymbolTable::new_symbol(str, len);
81 }
82
83 ModuleEntryTable* Modules::get_module_entry_table(Handle h_loader) {
84 // This code can be called during start-up, before the classLoader's classLoader data got
85 // created. So, call register_loader() to make sure the classLoader data gets created.
86 ClassLoaderData *loader_cld = SystemDictionary::register_loader(h_loader);
87 return loader_cld->modules();
88 }
89
90 static PackageEntryTable* get_package_entry_table(Handle h_loader) {
91 // This code can be called during start-up, before the classLoader's classLoader data got
92 // created. So, call register_loader() to make sure the classLoader data gets created.
93 ClassLoaderData *loader_cld = SystemDictionary::register_loader(h_loader);
94 return loader_cld->packages();
95 }
96
97 static ModuleEntry* get_module_entry(jobject module, TRAPS) {
98 oop m = JNIHandles::resolve_non_null(module);
99 if (!java_lang_Module::is_instance(m)) {
100 THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),
101 "module is not an instance of type java.lang.Module");
102 }
103 return java_lang_Module::module_entry(m);
104 }
105
106
107 static PackageEntry* get_locked_package_entry(ModuleEntry* module_entry, const char* package_name, int len, TRAPS) {
108 assert(Module_lock->owned_by_self(), "should have the Module_lock");
109 assert(package_name != NULL, "Precondition");
110 TempNewSymbol pkg_symbol = SymbolTable::new_symbol(package_name, len);
111 PackageEntryTable* package_entry_table = module_entry->loader_data()->packages();
112 assert(package_entry_table != NULL, "Unexpected null package entry table");
113 PackageEntry* package_entry = package_entry_table->locked_lookup_only(pkg_symbol);
114 assert(package_entry == NULL || package_entry->module() == module_entry, "Unexpectedly found a package linked to another module");
115 return package_entry;
116 }
117
118 static PackageEntry* get_package_entry_by_name(Symbol* package,
119 Handle h_loader,
120 TRAPS) {
121 if (package != NULL) {
122 PackageEntryTable* const package_entry_table =
123 get_package_entry_table(h_loader);
124 assert(package_entry_table != NULL, "Unexpected null package entry table");
125 return package_entry_table->lookup_only(package);
126 }
127 return NULL;
128 }
129
130 bool Modules::is_package_defined(Symbol* package, Handle h_loader, TRAPS) {
131 PackageEntry* res = get_package_entry_by_name(package, h_loader, CHECK_false);
132 return res != NULL;
133 }
134
135 // Converts the String oop to an internal package
136 // Will use the provided buffer if it's sufficiently large, otherwise allocates
137 // a resource array
138 // The length of the resulting string will be assigned to utf8_len
139 static const char* as_internal_package(oop package_string, char* buf, int buflen, int& utf8_len) {
140 char* package_name = java_lang_String::as_utf8_string_full(package_string, buf, buflen, utf8_len);
141
142 // Turn all '/'s into '.'s
143 for (int index = 0; index < utf8_len; index++) {
144 if (package_name[index] == JVM_SIGNATURE_DOT) {
145 package_name[index] = JVM_SIGNATURE_SLASH;
146 }
147 }
148 return package_name;
149 }
150
151 static void define_javabase_module(Handle module_handle, jstring version, jstring location,
152 objArrayHandle pkgs, int num_packages, TRAPS) {
153 ResourceMark rm(THREAD);
154
155 // Obtain java.base's module version
156 TempNewSymbol version_symbol = as_symbol(version);
157
158 // Obtain java.base's location
159 TempNewSymbol location_symbol = as_symbol(location);
160
161 // Check that the packages are syntactically ok.
162 char buf[128];
163 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
164 for (int x = 0; x < num_packages; x++) {
165 oop pkg_str = pkgs->obj_at(x);
166
167 if (pkg_str == NULL || pkg_str->klass() != SystemDictionary::String_klass()) {
168 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
169 err_msg("Bad package name"));
170 }
171
172 int package_len;
173 const char* package_name = as_internal_package(pkg_str, buf, sizeof(buf), package_len);
174 if (!verify_package_name(package_name, package_len)) {
175 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
176 err_msg("Invalid package name: %s for module: " JAVA_BASE_NAME, package_name));
177 }
178 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, package_len);
179 pkg_list->append(pkg_symbol);
180 }
181
182 // Validate java_base's loader is the boot loader.
183 oop loader = java_lang_Module::loader(module_handle());
184 if (loader != NULL) {
185 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
186 "Class loader must be the boot class loader");
187 }
188 Handle h_loader(THREAD, loader);
189
190 // Ensure the boot loader's PackageEntryTable has been created
191 PackageEntryTable* package_table = get_package_entry_table(h_loader);
192 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package_table");
193
194 // Ensure java.base's ModuleEntry has been created
195 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, "No ModuleEntry for " JAVA_BASE_NAME);
196
197 bool duplicate_javabase = false;
198 {
199 MutexLocker m1(THREAD, Module_lock);
200
201 if (ModuleEntryTable::javabase_defined()) {
202 duplicate_javabase = true;
203 } else {
204
205 // Verify that all java.base packages created during bootstrapping are in
206 // pkg_list. If any are not in pkg_list, than a non-java.base class was
207 // loaded erroneously pre java.base module definition.
208 package_table->verify_javabase_packages(pkg_list);
209
210 // loop through and add any new packages for java.base
211 for (int x = 0; x < pkg_list->length(); x++) {
212 // Some of java.base's packages were added early in bootstrapping, ignore duplicates.
213 package_table->locked_create_entry_if_not_exist(pkg_list->at(x),
214 ModuleEntryTable::javabase_moduleEntry());
215 assert(package_table->locked_lookup_only(pkg_list->at(x)) != NULL,
216 "Unable to create a " JAVA_BASE_NAME " package entry");
217 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
218 // the Symbol* that was created above for each package. The refcount was incremented
219 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
220 pkg_list->at(x)->decrement_refcount();
221 }
222
223 // Finish defining java.base's ModuleEntry
224 ModuleEntryTable::finalize_javabase(module_handle, version_symbol, location_symbol);
225 }
226 }
227 if (duplicate_javabase) {
228 THROW_MSG(vmSymbols::java_lang_InternalError(),
229 "Module " JAVA_BASE_NAME " is already defined");
230 }
231
232 // Only the thread that actually defined the base module will get here,
233 // so no locking is needed.
234
235 // Patch any previously loaded class's module field with java.base's java.lang.Module.
236 ModuleEntryTable::patch_javabase_entries(module_handle);
237
238 log_info(module, load)(JAVA_BASE_NAME " location: %s",
239 location_symbol != NULL ? location_symbol->as_C_string() : "NULL");
240 log_debug(module)("define_javabase_module(): Definition of module: "
241 JAVA_BASE_NAME ", version: %s, location: %s, package #: %d",
242 version_symbol != NULL ? version_symbol->as_C_string() : "NULL",
243 location_symbol != NULL ? location_symbol->as_C_string() : "NULL",
244 pkg_list->length());
245
246 // packages defined to java.base
247 if (log_is_enabled(Trace, module)) {
248 for (int x = 0; x < pkg_list->length(); x++) {
249 log_trace(module)("define_javabase_module(): creation of package %s for module " JAVA_BASE_NAME,
250 (pkg_list->at(x))->as_C_string());
251 }
252 }
253 }
254
255 // Caller needs ResourceMark.
256 void throw_dup_pkg_exception(const char* module_name, PackageEntry* package, TRAPS) {
257 const char* package_name = package->name()->as_C_string();
258 if (package->module()->is_named()) {
259 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
260 err_msg("Package %s for module %s is already in another module, %s, defined to the class loader",
261 package_name, module_name, package->module()->name()->as_C_string()));
262 } else {
263 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
264 err_msg("Package %s for module %s is already in the unnamed module defined to the class loader",
265 package_name, module_name));
266 }
267 }
268
269 void Modules::define_module(jobject module, jboolean is_open, jstring version,
270 jstring location, jobjectArray packages, TRAPS) {
271 ResourceMark rm(THREAD);
272
273 if (module == NULL) {
274 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
275 }
276
277 Handle module_handle(THREAD, JNIHandles::resolve_non_null(module));
278 if (!java_lang_Module::is_instance(module_handle())) {
279 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
280 "module is not an instance of type java.lang.Module");
281 }
282
283 int module_name_len;
284 char* module_name = get_module_name(module_handle(), module_name_len, CHECK);
285 if (module_name == NULL) {
286 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
287 "Module name cannot be null");
288 }
289
290 // Resolve packages
291 objArrayHandle packages_h(THREAD, objArrayOop(JNIHandles::resolve(packages)));
292 int num_packages = (packages_h.is_null() ? 0 : packages_h->length());
293
294 // Special handling of java.base definition
295 if (strcmp(module_name, JAVA_BASE_NAME) == 0) {
296 assert(is_open == JNI_FALSE, "java.base module cannot be open");
297 define_javabase_module(module_handle, version, location, packages_h, num_packages, CHECK);
298 return;
299 }
300
301 oop loader = java_lang_Module::loader(module_handle());
302 // Make sure loader is not the jdk.internal.reflect.DelegatingClassLoader.
303 if (loader != java_lang_ClassLoader::non_reflection_class_loader(loader)) {
304 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
305 "Class loader is an invalid delegating class loader");
306 }
307 Handle h_loader = Handle(THREAD, loader);
308 // define_module can be called during start-up, before the class loader's ClassLoaderData
309 // has been created. SystemDictionary::register_loader ensures creation, if needed.
310 ClassLoaderData* loader_data = SystemDictionary::register_loader(h_loader);
311 assert(loader_data != NULL, "class loader data shouldn't be null");
312
313 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
314 bool java_pkg_disallowed = !h_loader.is_null() &&
315 !SystemDictionary::is_platform_class_loader(h_loader());
316
317 // Check that the list of packages has no duplicates and that the
318 // packages are syntactically ok.
319 char buf[128];
320 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
321 for (int x = 0; x < num_packages; x++) {
322 oop pkg_str = packages_h->obj_at(x);
323 if (pkg_str == NULL || pkg_str->klass() != SystemDictionary::String_klass()) {
324 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
325 err_msg("Bad package name"));
326 }
327
328 int package_len;
329 const char* package_name = as_internal_package(pkg_str, buf, sizeof(buf), package_len);
330 if (!verify_package_name(package_name, package_len)) {
331 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
332 err_msg("Invalid package name: %s for module: %s",
333 package_name, module_name));
334 }
335
336 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
337 if (java_pkg_disallowed &&
338 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&
339 (package_name[JAVAPKG_LEN] == JVM_SIGNATURE_SLASH || package_name[JAVAPKG_LEN] == '\0'))) {
340 const char* class_loader_name = loader_data->loader_name_and_id();
341 size_t pkg_len = strlen(package_name);
342 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len + 1);
343 strncpy(pkg_name, package_name, pkg_len + 1);
344 StringUtils::replace_no_expand(pkg_name, "/", ".");
345 const char* msg_text1 = "Class loader (instance of): ";
346 const char* msg_text2 = " tried to define prohibited package name: ";
347 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;
348 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
349 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);
350 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);
351 }
352
353 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, package_len);
354 pkg_list->append(pkg_symbol);
355 }
356
357 ModuleEntryTable* module_table = get_module_entry_table(h_loader);
358 assert(module_table != NULL, "module entry table shouldn't be null");
359
360 // Create symbol* entry for module name.
361 TempNewSymbol module_symbol = SymbolTable::new_symbol(module_name, module_name_len);
362
363 bool dupl_modules = false;
364
365 // Create symbol for module version.
366 TempNewSymbol version_symbol = as_symbol(version);
367
368 // Create symbol* entry for module location.
369 TempNewSymbol location_symbol = as_symbol(location);
370
371 PackageEntryTable* package_table = NULL;
372 PackageEntry* existing_pkg = NULL;
373 {
374 MutexLocker ml(THREAD, Module_lock);
375
376 if (num_packages > 0) {
377 package_table = get_package_entry_table(h_loader);
378 assert(package_table != NULL, "Missing package_table");
379
380 // Check that none of the packages exist in the class loader's package table.
381 for (int x = 0; x < pkg_list->length(); x++) {
382 existing_pkg = package_table->locked_lookup_only(pkg_list->at(x));
383 if (existing_pkg != NULL) {
384 // This could be because the module was already defined. If so,
385 // report that error instead of the package error.
386 if (module_table->lookup_only(module_symbol) != NULL) {
387 dupl_modules = true;
388 }
389 break;
390 }
391 }
392 } // if (num_packages > 0)...
393
394 // Add the module and its packages.
395 if (!dupl_modules && existing_pkg == NULL) {
396 if (module_table->lookup_only(module_symbol) == NULL) {
397 // Create the entry for this module in the class loader's module entry table.
398 ModuleEntry* module_entry = module_table->locked_create_entry(module_handle,
399 (is_open == JNI_TRUE), module_symbol,
400 version_symbol, location_symbol, loader_data);
401 assert(module_entry != NULL, "module_entry creation failed");
402
403 // Add the packages.
404 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package table");
405 for (int y = 0; y < pkg_list->length(); y++) {
406 package_table->locked_create_entry(pkg_list->at(y), module_entry);
407
408 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
409 // the Symbol* that was created above for each package. The refcount was incremented
410 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
411 pkg_list->at(y)->decrement_refcount();
412 }
413
414 // Store pointer to ModuleEntry record in java.lang.Module object.
415 java_lang_Module::set_module_entry(module_handle(), module_entry);
416 } else {
417 dupl_modules = true;
418 }
419 }
420 } // Release the lock
421
422 // any errors ?
423 if (dupl_modules) {
424 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
425 err_msg("Module %s is already defined", module_name));
426 } else if (existing_pkg != NULL) {
427 throw_dup_pkg_exception(module_name, existing_pkg, CHECK);
428 }
429
430 log_info(module, load)("%s location: %s", module_name,
431 location_symbol != NULL ? location_symbol->as_C_string() : "NULL");
432 LogTarget(Debug, module) lt;
433 if (lt.is_enabled()) {
434 LogStream ls(lt);
435 ls.print("define_module(): creation of module: %s, version: %s, location: %s, ",
436 module_name, version_symbol != NULL ? version_symbol->as_C_string() : "NULL",
437 location_symbol != NULL ? location_symbol->as_C_string() : "NULL");
438 loader_data->print_value_on(&ls);
439 ls.print_cr(", package #: %d", pkg_list->length());
440 for (int y = 0; y < pkg_list->length(); y++) {
441 log_trace(module)("define_module(): creation of package %s for module %s",
442 (pkg_list->at(y))->as_C_string(), module_name);
443 }
444 }
445
446 // If the module is defined to the boot loader and an exploded build is being
447 // used, prepend <java.home>/modules/modules_name to the system boot class path.
448 if (h_loader.is_null() && !ClassLoader::has_jrt_entry()) {
449 ClassLoader::add_to_exploded_build_list(module_symbol, CHECK);
450 }
451 }
452
453 void Modules::set_bootloader_unnamed_module(jobject module, TRAPS) {
454 ResourceMark rm(THREAD);
455
456 if (module == NULL) {
457 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
458 }
459 Handle module_handle(THREAD, JNIHandles::resolve(module));
460 if (!java_lang_Module::is_instance(module_handle())) {
461 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
462 "module is not an instance of type java.lang.Module");
463 }
464
465 // Ensure that this is an unnamed module
466 oop name = java_lang_Module::name(module_handle());
467 if (name != NULL) {
468 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
469 "boot loader's unnamed module's java.lang.Module has a name");
470 }
471
472 // Validate java_base's loader is the boot loader.
473 oop loader = java_lang_Module::loader(module_handle());
474 if (loader != NULL) {
475 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
476 "Class loader must be the boot class loader");
477 }
478
479 log_debug(module)("set_bootloader_unnamed_module(): recording unnamed module for boot loader");
480
481 // Set java.lang.Module for the boot loader's unnamed module
482 ClassLoaderData* boot_loader_data = ClassLoaderData::the_null_class_loader_data();
483 ModuleEntry* unnamed_module = boot_loader_data->unnamed_module();
484 assert(unnamed_module != NULL, "boot loader's unnamed ModuleEntry not defined");
485 unnamed_module->set_module(boot_loader_data->add_handle(module_handle));
486 // Store pointer to the ModuleEntry in the unnamed module's java.lang.Module object.
487 java_lang_Module::set_module_entry(module_handle(), unnamed_module);
488 }
489
490 void Modules::add_module_exports(jobject from_module, jstring package_name, jobject to_module, TRAPS) {
491
492 if (package_name == NULL) {
493 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
494 "package is null");
495 }
496 if (from_module == NULL) {
497 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
498 "from_module is null");
499 }
500 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
501 if (from_module_entry == NULL) {
502 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
503 "from_module cannot be found");
504 }
505
506 // All packages in unnamed and open modules are exported by default.
507 if (!from_module_entry->is_named() || from_module_entry->is_open()) return;
508
509 ModuleEntry* to_module_entry;
510 if (to_module == NULL) {
511 to_module_entry = NULL; // It's an unqualified export.
512 } else {
513 to_module_entry = get_module_entry(to_module, CHECK);
514 if (to_module_entry == NULL) {
515 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
516 "to_module is invalid");
517 }
518 }
519
520 PackageEntry* package_entry = NULL;
521 char buf[128];
522 int package_len;
523
524 ResourceMark rm(THREAD);
525 const char* pkg = as_internal_package(JNIHandles::resolve_non_null(package_name), buf, sizeof(buf), package_len);
526 {
527 MutexLocker ml(THREAD, Module_lock);
528 package_entry = get_locked_package_entry(from_module_entry, pkg, package_len, CHECK);
529 // Do nothing if modules are the same
530 // If the package is not found we'll throw an exception later
531 if (from_module_entry != to_module_entry &&
532 package_entry != NULL) {
533 package_entry->set_exported(to_module_entry);
534 }
535 }
536
537 // Handle errors and logging outside locked section
538 if (package_entry == NULL) {
539 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
540 err_msg("Package %s not found in from_module %s",
541 pkg != NULL ? pkg : "",
542 from_module_entry->name()->as_C_string()));
543 }
544
545 if (log_is_enabled(Debug, module)) {
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 }
554
555
556 void Modules::add_module_exports_qualified(jobject from_module, jstring 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 LogTarget(Debug,module) lt;
627 if (lt.is_enabled()) {
628 ResourceMark rm(THREAD);
629 LogStream ls(lt);
630 Klass* klass = java_lang_Class::as_Klass(mirror);
631 oop module_name = java_lang_Module::name(module);
632 if (module_name != NULL) {
633 ls.print("get_module(): module ");
634 java_lang_String::print(module_name, tty);
635 } else {
636 ls.print("get_module(): Unamed Module");
637 }
638 if (klass != NULL) {
639 ls.print_cr(" for class %s", klass->external_name());
640 } else {
641 ls.print_cr(" for primitive class");
642 }
643 }
644
645 return JNIHandles::make_local(THREAD, module);
646 }
647
648 jobject Modules::get_named_module(Handle h_loader, const char* package_name, TRAPS) {
649 assert(ModuleEntryTable::javabase_defined(),
650 "Attempt to call get_named_module before " JAVA_BASE_NAME " is defined");
651 assert(h_loader.is_null() || java_lang_ClassLoader::is_subclass(h_loader->klass()),
652 "Class loader is not a subclass of java.lang.ClassLoader");
653 assert(package_name != NULL, "the package_name should not be NULL");
654
655 if (strlen(package_name) == 0) {
656 return NULL;
657 }
658 TempNewSymbol package_sym = SymbolTable::new_symbol(package_name);
659 const PackageEntry* const pkg_entry =
660 get_package_entry_by_name(package_sym, h_loader, THREAD);
661 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
662
663 if (module_entry != NULL && module_entry->module() != NULL && module_entry->is_named()) {
664 return JNIHandles::make_local(THREAD, module_entry->module());
665 }
666 return NULL;
667 }
668
669 // Export package in module to all unnamed modules.
670 void Modules::add_module_exports_to_all_unnamed(jobject module, jstring package_name, TRAPS) {
671 if (module == NULL) {
672 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
673 "module is null");
674 }
675 if (package_name == NULL) {
676 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
677 "package is null");
678 }
679 ModuleEntry* module_entry = get_module_entry(module, CHECK);
680 if (module_entry == NULL) {
681 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
682 "module is invalid");
683 }
684
685 // No-op for unnamed module and open modules
686 if (!module_entry->is_named() || module_entry->is_open())
687 return;
688
689 ResourceMark rm(THREAD);
690 char buf[128];
691 int pkg_len;
692 const char* pkg = as_internal_package(JNIHandles::resolve_non_null(package_name), buf, sizeof(buf), pkg_len);
693 PackageEntry* package_entry = NULL;
694 {
695 MutexLocker m1(THREAD, Module_lock);
696 package_entry = get_locked_package_entry(module_entry, pkg, pkg_len, CHECK);
697
698 // Mark package as exported to all unnamed modules.
699 if (package_entry != NULL) {
700 package_entry->set_is_exported_allUnnamed();
701 }
702 }
703
704 // Handle errors and logging outside locked section
705 if (package_entry == NULL) {
706 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
707 err_msg("Package %s not found in module %s",
708 pkg != NULL ? pkg : "",
709 module_entry->name()->as_C_string()));
710 }
711
712 if (log_is_enabled(Debug, module)) {
713 log_debug(module)("add_module_exports_to_all_unnamed(): package %s in module"
714 " %s is exported to all unnamed modules",
715 package_entry->name()->as_C_string(),
716 module_entry->name()->as_C_string());
717 }
718 }