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 static ModuleEntryTable* 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
316 // Check that the list of packages has no duplicates and that the
317 // packages are syntactically ok.
318 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
319 for (int x = 0; x < num_packages; x++) {
320 const char* package_name = packages[x];
321 if (!verify_package_name(package_name)) {
322 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
323 err_msg("Invalid package name: %s for module: %s",
324 package_name, module_name));
325 }
326
327 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
328 if (!h_loader.is_null() &&
329 !SystemDictionary::is_platform_class_loader(h_loader()) &&
330 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&
331 (package_name[JAVAPKG_LEN] == '/' || package_name[JAVAPKG_LEN] == '\0'))) {
332 const char* class_loader_name = SystemDictionary::loader_name(h_loader());
333 size_t pkg_len = strlen(package_name);
334 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len);
335 strncpy(pkg_name, package_name, pkg_len);
336 StringUtils::replace_no_expand(pkg_name, "/", ".");
337 const char* msg_text1 = "Class loader (instance of): ";
338 const char* msg_text2 = " tried to define prohibited package name: ";
339 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;
340 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
341 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);
342 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);
343 }
344
345 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);
346 pkg_list->append(pkg_symbol);
347 }
348
349 ModuleEntryTable* module_table = get_module_entry_table(h_loader);
350 assert(module_table != NULL, "module entry table shouldn't be null");
351
352 // Create symbol* entry for module name.
353 TempNewSymbol module_symbol = SymbolTable::new_symbol(module_name, CHECK);
354
355 bool dupl_modules = false;
356
357 // Create symbol* entry for module version.
358 TempNewSymbol version_symbol;
359 if (module_version != NULL) {
360 version_symbol = SymbolTable::new_symbol(module_version, CHECK);
361 } else {
362 version_symbol = NULL;
363 }
364
365 // Create symbol* entry for module location.
366 const char* module_location = NULL;
367 TempNewSymbol location_symbol = NULL;
368 if (location != NULL) {
369 module_location =
370 java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(location));
371 if (module_location != NULL) {
372 location_symbol = SymbolTable::new_symbol(module_location, CHECK);
373 }
374 }
375
376 ClassLoaderData* loader_data = ClassLoaderData::class_loader_data_or_null(h_loader());
377 assert(loader_data != NULL, "class loader data shouldn't be null");
378
379 PackageEntryTable* package_table = NULL;
380 PackageEntry* existing_pkg = NULL;
381 {
382 MutexLocker ml(Module_lock, THREAD);
383
384 if (num_packages > 0) {
385 package_table = get_package_entry_table(h_loader);
386 assert(package_table != NULL, "Missing package_table");
387
388 // Check that none of the packages exist in the class loader's package table.
389 for (int x = 0; x < pkg_list->length(); x++) {
390 existing_pkg = package_table->lookup_only(pkg_list->at(x));
391 if (existing_pkg != NULL) {
392 // This could be because the module was already defined. If so,
393 // report that error instead of the package error.
394 if (module_table->lookup_only(module_symbol) != NULL) {
395 dupl_modules = true;
396 }
397 break;
398 }
399 }
400 } // if (num_packages > 0)...
401
402 // Add the module and its packages.
403 if (!dupl_modules && existing_pkg == NULL) {
404 // Create the entry for this module in the class loader's module entry table.
405 ModuleEntry* module_entry = module_table->locked_create_entry_or_null(module_handle,
406 (is_open == JNI_TRUE), module_symbol,
407 version_symbol, location_symbol, loader_data);
408
409 if (module_entry == NULL) {
410 dupl_modules = true;
411 } else {
412 // Add the packages.
413 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package table");
414 PackageEntry* pkg;
415 for (int y = 0; y < pkg_list->length(); y++) {
416 pkg = package_table->locked_create_entry_or_null(pkg_list->at(y), module_entry);
417 assert(pkg != NULL, "Unable to create a module's package entry");
418
419 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
420 // the Symbol* that was created above for each package. The refcount was incremented
421 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
422 pkg_list->at(y)->decrement_refcount();
423 }
424
425 // Store pointer to ModuleEntry record in java.lang.Module object.
426 java_lang_Module::set_module_entry(module_handle(), module_entry);
427 }
428 }
429 } // Release the lock
430
431 // any errors ?
432 if (dupl_modules) {
433 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
434 err_msg("Module %s is already defined", module_name));
435 } else if (existing_pkg != NULL) {
436 throw_dup_pkg_exception(module_name, existing_pkg, CHECK);
437 }
438
439 log_info(module, load)("%s location: %s", module_name,
440 module_location != NULL ? module_location : "NULL");
441 LogTarget(Debug, module) lt;
442 if (lt.is_enabled()) {
443 LogStream ls(lt);
444 ls.print("define_module(): creation of module: %s, version: %s, location: %s, ",
445 module_name, module_version != NULL ? module_version : "NULL",
446 module_location != NULL ? module_location : "NULL");
447 loader_data->print_value_on(&ls);
448 ls.print_cr(", package #: %d", pkg_list->length());
449 for (int y = 0; y < pkg_list->length(); y++) {
450 log_trace(module)("define_module(): creation of package %s for module %s",
451 (pkg_list->at(y))->as_C_string(), module_name);
452 }
453 }
454
455 // If the module is defined to the boot loader and an exploded build is being
456 // used, prepend <java.home>/modules/modules_name to the system boot class path.
457 if (loader == NULL && !ClassLoader::has_jrt_entry()) {
458 ClassLoader::add_to_exploded_build_list(module_symbol, CHECK);
459 }
460 }
461
462 void Modules::set_bootloader_unnamed_module(jobject module, TRAPS) {
463 ResourceMark rm(THREAD);
464
465 if (module == NULL) {
466 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
467 }
468 Handle module_handle(THREAD, JNIHandles::resolve(module));
469 if (!java_lang_Module::is_instance(module_handle())) {
470 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
471 "module is not an instance of type java.lang.Module");
472 }
473
474 // Ensure that this is an unnamed module
475 oop name = java_lang_Module::name(module_handle());
476 if (name != NULL) {
477 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
478 "boot loader's unnamed module's java.lang.Module has a name");
479 }
480
481 // Validate java_base's loader is the boot loader.
482 oop loader = java_lang_Module::loader(module_handle());
483 if (loader != NULL) {
484 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
485 "Class loader must be the boot class loader");
486 }
487 Handle h_loader(THREAD, loader);
488
489 log_debug(module)("set_bootloader_unnamed_module(): recording unnamed module for boot loader");
490
491 // Set java.lang.Module for the boot loader's unnamed module
492 ClassLoaderData* boot_loader_data = ClassLoaderData::the_null_class_loader_data();
493 ModuleEntry* unnamed_module = boot_loader_data->unnamed_module();
494 assert(unnamed_module != NULL, "boot loader's unnamed ModuleEntry not defined");
495 unnamed_module->set_module(boot_loader_data->add_handle(module_handle));
496 // Store pointer to the ModuleEntry in the unnamed module's java.lang.Module object.
497 java_lang_Module::set_module_entry(module_handle(), unnamed_module);
498 }
499
500 void Modules::add_module_exports(jobject from_module, const char* package_name, jobject to_module, TRAPS) {
501 if (package_name == NULL) {
502 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
503 "package is null");
504 }
505 if (from_module == NULL) {
506 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
507 "from_module is null");
508 }
509 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
510 if (from_module_entry == NULL) {
511 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
512 "from_module cannot be found");
513 }
514
515 // All packages in unnamed and open modules are exported by default.
516 if (!from_module_entry->is_named() || from_module_entry->is_open()) return;
517
518 ModuleEntry* to_module_entry;
519 if (to_module == NULL) {
520 to_module_entry = NULL; // It's an unqualified export.
521 } else {
522 to_module_entry = get_module_entry(to_module, CHECK);
523 if (to_module_entry == NULL) {
524 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
525 "to_module is invalid");
526 }
527 }
528
529 PackageEntry *package_entry = get_package_entry(from_module_entry, package_name, CHECK);
530 ResourceMark rm(THREAD);
531 if (package_entry == NULL) {
532 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
533 err_msg("Package %s not found in from_module %s",
534 package_name != NULL ? package_name : "",
535 from_module_entry->name()->as_C_string()));
536 }
537 if (package_entry->module() != from_module_entry) {
538 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
539 err_msg("Package: %s found in module %s, not in from_module: %s",
540 package_entry->name()->as_C_string(),
541 package_entry->module()->name()->as_C_string(),
542 from_module_entry->name()->as_C_string()));
543 }
544
545 log_debug(module)("add_module_exports(): package %s in module %s is exported to module %s",
546 package_entry->name()->as_C_string(),
547 from_module_entry->name()->as_C_string(),
548 to_module_entry == NULL ? "NULL" :
549 to_module_entry->is_named() ?
550 to_module_entry->name()->as_C_string() : UNNAMED_MODULE);
551
552 // Do nothing if modules are the same.
553 if (from_module_entry != to_module_entry) {
554 package_entry->set_exported(to_module_entry);
555 }
556 }
557
558
559 void Modules::add_module_exports_qualified(jobject from_module, const char* package,
560 jobject to_module, TRAPS) {
561 if (to_module == NULL) {
562 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
563 "to_module is null");
564 }
565 add_module_exports(from_module, package, to_module, CHECK);
566 }
567
568 void Modules::add_reads_module(jobject from_module, jobject to_module, TRAPS) {
569 if (from_module == NULL) {
570 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
571 "from_module is null");
572 }
573
574 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
575 if (from_module_entry == NULL) {
576 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
577 "from_module is not valid");
578 }
579
580 ModuleEntry* to_module_entry;
581 if (to_module != NULL) {
582 to_module_entry = get_module_entry(to_module, CHECK);
583 if (to_module_entry == NULL) {
584 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
585 "to_module is invalid");
586 }
587 } else {
588 to_module_entry = NULL;
589 }
590
591 ResourceMark rm(THREAD);
592 log_debug(module)("add_reads_module(): Adding read from module %s to module %s",
593 from_module_entry->is_named() ?
594 from_module_entry->name()->as_C_string() : UNNAMED_MODULE,
595 to_module_entry == NULL ? "all unnamed" :
596 (to_module_entry->is_named() ?
597 to_module_entry->name()->as_C_string() : UNNAMED_MODULE));
598
599 // if modules are the same or if from_module is unnamed then no need to add the read.
600 if (from_module_entry != to_module_entry && from_module_entry->is_named()) {
601 from_module_entry->add_read(to_module_entry);
602 }
603 }
604
605 // This method is called by JFR and JNI.
606 jobject Modules::get_module(jclass clazz, TRAPS) {
607 assert(ModuleEntryTable::javabase_defined(),
608 "Attempt to call get_module before " JAVA_BASE_NAME " is defined");
609
610 if (clazz == NULL) {
611 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
612 "class is null", JNI_FALSE);
613 }
614 oop mirror = JNIHandles::resolve_non_null(clazz);
615 if (mirror == NULL) {
616 log_debug(module)("get_module(): no mirror, returning NULL");
617 return NULL;
618 }
619 if (!java_lang_Class::is_instance(mirror)) {
620 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
621 "Invalid class", JNI_FALSE);
622 }
623
624 oop module = java_lang_Class::module(mirror);
625
626 assert(module != NULL, "java.lang.Class module field not set");
627 assert(java_lang_Module::is_instance(module), "module is not an instance of type java.lang.Module");
628
629 LogTarget(Debug,module) lt;
630 if (lt.is_enabled()) {
631 ResourceMark rm(THREAD);
632 LogStream ls(lt);
633 Klass* klass = java_lang_Class::as_Klass(mirror);
634 oop module_name = java_lang_Module::name(module);
635 if (module_name != NULL) {
636 ls.print("get_module(): module ");
637 java_lang_String::print(module_name, tty);
638 } else {
639 ls.print("get_module(): Unamed Module");
640 }
641 if (klass != NULL) {
642 ls.print_cr(" for class %s", klass->external_name());
643 } else {
644 ls.print_cr(" for primitive class");
645 }
646 }
647
648 return JNIHandles::make_local(THREAD, module);
649 }
650
651 jobject Modules::get_named_module(Handle h_loader, const char* package_name, TRAPS) {
652 assert(ModuleEntryTable::javabase_defined(),
653 "Attempt to call get_named_module before " JAVA_BASE_NAME " is defined");
654 assert(h_loader.is_null() || java_lang_ClassLoader::is_subclass(h_loader->klass()),
655 "Class loader is not a subclass of java.lang.ClassLoader");
656 assert(package_name != NULL, "the package_name should not be NULL");
657
658 if (strlen(package_name) == 0) {
659 return NULL;
660 }
661 TempNewSymbol package_sym = SymbolTable::new_symbol(package_name, CHECK_NULL);
662 const PackageEntry* const pkg_entry =
663 get_package_entry_by_name(package_sym, h_loader, THREAD);
664 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
665
666 if (module_entry != NULL && module_entry->module() != NULL && module_entry->is_named()) {
667 return JNIHandles::make_local(THREAD, module_entry->module());
668 }
669 return NULL;
670 }
671
672
673 // This method is called by JFR and by the above method.
674 jobject Modules::get_module(Symbol* package_name, Handle h_loader, TRAPS) {
675 const PackageEntry* const pkg_entry =
676 get_package_entry_by_name(package_name, h_loader, THREAD);
677 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
678
679 if (module_entry != NULL &&
680 module_entry->module() != NULL) {
681 return JNIHandles::make_local(THREAD, module_entry->module());
682 }
683
684 return NULL;
685 }
686
687 // Export package in module to all unnamed modules.
688 void Modules::add_module_exports_to_all_unnamed(jobject module, const char* package_name, TRAPS) {
689 if (module == NULL) {
690 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
691 "module is null");
692 }
693 if (package_name == NULL) {
694 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
695 "package is null");
696 }
697 ModuleEntry* module_entry = get_module_entry(module, CHECK);
698 if (module_entry == NULL) {
699 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
700 "module is invalid");
701 }
702
703 if (module_entry->is_named()) { // No-op for unnamed module.
704 PackageEntry *package_entry = get_package_entry(module_entry, package_name, CHECK);
705 ResourceMark rm(THREAD);
706 if (package_entry == NULL) {
707 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
708 err_msg("Package %s not found in module %s",
709 package_name != NULL ? package_name : "",
710 module_entry->name()->as_C_string()));
711 }
712 if (package_entry->module() != module_entry) {
713 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
714 err_msg("Package: %s found in module %s, not in module: %s",
715 package_entry->name()->as_C_string(),
716 package_entry->module()->name()->as_C_string(),
717 module_entry->name()->as_C_string()));
718 }
719
720 log_debug(module)("add_module_exports_to_all_unnamed(): package %s in module"
721 " %s is exported to all unnamed modules",
722 package_entry->name()->as_C_string(),
723 module_entry->name()->as_C_string());
724
725 // Mark package as exported to all unnamed modules.
726 package_entry->set_is_exported_allUnnamed();
727 }
728 }