1/*
2* Copyright (c) 2016, 2019, 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
52static 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
58bool 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
67static 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
81static 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
88ModuleEntryTable* Modules::get_module_entry_table(Handle h_loader) {
89 // This code can be called during start-up, before the classLoader's classLoader data got
90 // created. So, call register_loader() to make sure the classLoader data gets created.
91 ClassLoaderData *loader_cld = SystemDictionary::register_loader(h_loader);
92 return loader_cld->modules();
93}
94
95static 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
102static 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
111static 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);
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
120static 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
135bool 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
140static 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);
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);
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);
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 for (int x = 0; x < pkg_list->length(); x++) {
210 // Some of java.base's packages were added early in bootstrapping, ignore duplicates.
211 package_table->locked_create_entry_if_not_exist(pkg_list->at(x),
212 ModuleEntryTable::javabase_moduleEntry());
213 assert(package_table->locked_lookup_only(pkg_list->at(x)) != NULL,
214 "Unable to create a " JAVA_BASE_NAME " package entry");
215 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
216 // the Symbol* that was created above for each package. The refcount was incremented
217 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
218 pkg_list->at(x)->decrement_refcount();
219 }
220
221 // Finish defining java.base's ModuleEntry
222 ModuleEntryTable::finalize_javabase(module_handle, version_symbol, location_symbol);
223 }
224 }
225 if (duplicate_javabase) {
226 THROW_MSG(vmSymbols::java_lang_InternalError(),
227 "Module " JAVA_BASE_NAME " is already defined");
228 }
229
230 // Only the thread that actually defined the base module will get here,
231 // so no locking is needed.
232
233 // Patch any previously loaded class's module field with java.base's java.lang.Module.
234 ModuleEntryTable::patch_javabase_entries(module_handle);
235
236 log_info(module, load)(JAVA_BASE_NAME " location: %s",
237 module_location != NULL ? module_location : "NULL");
238 log_debug(module)("define_javabase_module(): Definition of module: "
239 JAVA_BASE_NAME ", version: %s, location: %s, package #: %d",
240 module_version != NULL ? module_version : "NULL",
241 module_location != NULL ? module_location : "NULL",
242 pkg_list->length());
243
244 // packages defined to java.base
245 if (log_is_enabled(Trace, module)) {
246 for (int x = 0; x < pkg_list->length(); x++) {
247 log_trace(module)("define_javabase_module(): creation of package %s for module " JAVA_BASE_NAME,
248 (pkg_list->at(x))->as_C_string());
249 }
250 }
251}
252
253// Caller needs ResourceMark.
254void throw_dup_pkg_exception(const char* module_name, PackageEntry* package, TRAPS) {
255 const char* package_name = package->name()->as_C_string();
256 if (package->module()->is_named()) {
257 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
258 err_msg("Package %s for module %s is already in another module, %s, defined to the class loader",
259 package_name, module_name, package->module()->name()->as_C_string()));
260 } else {
261 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
262 err_msg("Package %s for module %s is already in the unnamed module defined to the class loader",
263 package_name, module_name));
264 }
265}
266
267void Modules::define_module(jobject module, jboolean is_open, jstring version,
268 jstring location, const char* const* packages,
269 jsize num_packages, TRAPS) {
270 ResourceMark rm(THREAD);
271
272 if (module == NULL) {
273 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
274 }
275
276 if (num_packages < 0) {
277 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
278 "num_packages must be >= 0");
279 }
280
281 if (packages == NULL && num_packages > 0) {
282 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
283 "num_packages should be zero if packages is null");
284 }
285
286 Handle module_handle(THREAD, JNIHandles::resolve(module));
287 if (!java_lang_Module::is_instance(module_handle())) {
288 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
289 "module is not an instance of type java.lang.Module");
290 }
291
292 char* module_name = get_module_name(module_handle(), CHECK);
293 if (module_name == NULL) {
294 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
295 "Module name cannot be null");
296 }
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, version, location, packages, num_packages, CHECK);
302 return;
303 }
304
305 const char* module_version = get_module_version(version);
306
307 oop loader = java_lang_Module::loader(module_handle());
308 // Make sure loader is not the jdk.internal.reflect.DelegatingClassLoader.
309 if (!oopDesc::equals(loader, java_lang_ClassLoader::non_reflection_class_loader(loader))) {
310 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
311 "Class loader is an invalid delegating class loader");
312 }
313 Handle h_loader = Handle(THREAD, loader);
314 // define_module can be called during start-up, before the class loader's ClassLoaderData
315 // has been created. SystemDictionary::register_loader ensures creation, if needed.
316 ClassLoaderData* loader_data = SystemDictionary::register_loader(h_loader);
317 assert(loader_data != NULL, "class loader data shouldn't be null");
318
319 // Check that the list of packages has no duplicates and that the
320 // packages are syntactically ok.
321 GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);
322 for (int x = 0; x < num_packages; x++) {
323 const char* package_name = packages[x];
324 if (!verify_package_name(package_name)) {
325 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
326 err_msg("Invalid package name: %s for module: %s",
327 package_name, module_name));
328 }
329
330 // Only modules defined to either the boot or platform class loader, can define a "java/" package.
331 if (!h_loader.is_null() &&
332 !SystemDictionary::is_platform_class_loader(h_loader()) &&
333 (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&
334 (package_name[JAVAPKG_LEN] == '/' || package_name[JAVAPKG_LEN] == '\0'))) {
335 const char* class_loader_name = loader_data->loader_name_and_id();
336 size_t pkg_len = strlen(package_name);
337 char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len + 1);
338 strncpy(pkg_name, package_name, pkg_len + 1);
339 StringUtils::replace_no_expand(pkg_name, "/", ".");
340 const char* msg_text1 = "Class loader (instance of): ";
341 const char* msg_text2 = " tried to define prohibited package name: ";
342 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;
343 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
344 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);
345 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);
346 }
347
348 Symbol* pkg_symbol = SymbolTable::new_symbol(package_name);
349 pkg_list->append(pkg_symbol);
350 }
351
352 ModuleEntryTable* module_table = get_module_entry_table(h_loader);
353 assert(module_table != NULL, "module entry table shouldn't be null");
354
355 // Create symbol* entry for module name.
356 TempNewSymbol module_symbol = SymbolTable::new_symbol(module_name);
357
358 bool dupl_modules = false;
359
360 // Create symbol* entry for module version.
361 TempNewSymbol version_symbol;
362 if (module_version != NULL) {
363 version_symbol = SymbolTable::new_symbol(module_version);
364 } else {
365 version_symbol = NULL;
366 }
367
368 // Create symbol* entry for module location.
369 const char* module_location = NULL;
370 TempNewSymbol location_symbol = NULL;
371 if (location != NULL) {
372 module_location =
373 java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(location));
374 if (module_location != NULL) {
375 location_symbol = SymbolTable::new_symbol(module_location);
376 }
377 }
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->locked_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 if (module_table->lookup_only(module_symbol) == NULL) {
405 // Create the entry for this module in the class loader's module entry table.
406 ModuleEntry* module_entry = module_table->locked_create_entry(module_handle,
407 (is_open == JNI_TRUE), module_symbol,
408 version_symbol, location_symbol, loader_data);
409 assert(module_entry != NULL, "module_entry creation failed");
410
411 // Add the packages.
412 assert(pkg_list->length() == 0 || package_table != NULL, "Bad package table");
413 for (int y = 0; y < pkg_list->length(); y++) {
414 package_table->locked_create_entry(pkg_list->at(y), module_entry);
415
416 // Unable to have a GrowableArray of TempNewSymbol. Must decrement the refcount of
417 // the Symbol* that was created above for each package. The refcount was incremented
418 // by SymbolTable::new_symbol and as well by the PackageEntry creation.
419 pkg_list->at(y)->decrement_refcount();
420 }
421
422 // Store pointer to ModuleEntry record in java.lang.Module object.
423 java_lang_Module::set_module_entry(module_handle(), module_entry);
424 } else {
425 dupl_modules = true;
426 }
427 }
428 } // Release the lock
429
430 // any errors ?
431 if (dupl_modules) {
432 THROW_MSG(vmSymbols::java_lang_IllegalStateException(),
433 err_msg("Module %s is already defined", module_name));
434 } else if (existing_pkg != NULL) {
435 throw_dup_pkg_exception(module_name, existing_pkg, CHECK);
436 }
437
438 log_info(module, load)("%s location: %s", module_name,
439 module_location != NULL ? module_location : "NULL");
440 LogTarget(Debug, module) lt;
441 if (lt.is_enabled()) {
442 LogStream ls(lt);
443 ls.print("define_module(): creation of module: %s, version: %s, location: %s, ",
444 module_name, module_version != NULL ? module_version : "NULL",
445 module_location != NULL ? module_location : "NULL");
446 loader_data->print_value_on(&ls);
447 ls.print_cr(", package #: %d", pkg_list->length());
448 for (int y = 0; y < pkg_list->length(); y++) {
449 log_trace(module)("define_module(): creation of package %s for module %s",
450 (pkg_list->at(y))->as_C_string(), module_name);
451 }
452 }
453
454 // If the module is defined to the boot loader and an exploded build is being
455 // used, prepend <java.home>/modules/modules_name to the system boot class path.
456 if (loader == NULL && !ClassLoader::has_jrt_entry()) {
457 ClassLoader::add_to_exploded_build_list(module_symbol, CHECK);
458 }
459}
460
461void Modules::set_bootloader_unnamed_module(jobject module, TRAPS) {
462 ResourceMark rm(THREAD);
463
464 if (module == NULL) {
465 THROW_MSG(vmSymbols::java_lang_NullPointerException(), "Null module object");
466 }
467 Handle module_handle(THREAD, JNIHandles::resolve(module));
468 if (!java_lang_Module::is_instance(module_handle())) {
469 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
470 "module is not an instance of type java.lang.Module");
471 }
472
473 // Ensure that this is an unnamed module
474 oop name = java_lang_Module::name(module_handle());
475 if (name != NULL) {
476 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
477 "boot loader's unnamed module's java.lang.Module has a name");
478 }
479
480 // Validate java_base's loader is the boot loader.
481 oop loader = java_lang_Module::loader(module_handle());
482 if (loader != NULL) {
483 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
484 "Class loader must be the boot class loader");
485 }
486 Handle h_loader(THREAD, loader);
487
488 log_debug(module)("set_bootloader_unnamed_module(): recording unnamed module for boot loader");
489
490 // Set java.lang.Module for the boot loader's unnamed module
491 ClassLoaderData* boot_loader_data = ClassLoaderData::the_null_class_loader_data();
492 ModuleEntry* unnamed_module = boot_loader_data->unnamed_module();
493 assert(unnamed_module != NULL, "boot loader's unnamed ModuleEntry not defined");
494 unnamed_module->set_module(boot_loader_data->add_handle(module_handle));
495 // Store pointer to the ModuleEntry in the unnamed module's java.lang.Module object.
496 java_lang_Module::set_module_entry(module_handle(), unnamed_module);
497}
498
499void Modules::add_module_exports(jobject from_module, const char* package_name, jobject to_module, TRAPS) {
500 if (package_name == NULL) {
501 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
502 "package is null");
503 }
504 if (from_module == NULL) {
505 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
506 "from_module is null");
507 }
508 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
509 if (from_module_entry == NULL) {
510 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
511 "from_module cannot be found");
512 }
513
514 // All packages in unnamed and open modules are exported by default.
515 if (!from_module_entry->is_named() || from_module_entry->is_open()) return;
516
517 ModuleEntry* to_module_entry;
518 if (to_module == NULL) {
519 to_module_entry = NULL; // It's an unqualified export.
520 } else {
521 to_module_entry = get_module_entry(to_module, CHECK);
522 if (to_module_entry == NULL) {
523 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
524 "to_module is invalid");
525 }
526 }
527
528 PackageEntry *package_entry = get_package_entry(from_module_entry, package_name, CHECK);
529 ResourceMark rm(THREAD);
530 if (package_entry == NULL) {
531 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
532 err_msg("Package %s not found in from_module %s",
533 package_name != NULL ? package_name : "",
534 from_module_entry->name()->as_C_string()));
535 }
536 if (package_entry->module() != from_module_entry) {
537 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
538 err_msg("Package: %s found in module %s, not in from_module: %s",
539 package_entry->name()->as_C_string(),
540 package_entry->module()->name()->as_C_string(),
541 from_module_entry->name()->as_C_string()));
542 }
543
544 log_debug(module)("add_module_exports(): package %s in module %s is exported to module %s",
545 package_entry->name()->as_C_string(),
546 from_module_entry->name()->as_C_string(),
547 to_module_entry == NULL ? "NULL" :
548 to_module_entry->is_named() ?
549 to_module_entry->name()->as_C_string() : UNNAMED_MODULE);
550
551 // Do nothing if modules are the same.
552 if (from_module_entry != to_module_entry) {
553 package_entry->set_exported(to_module_entry);
554 }
555}
556
557
558void Modules::add_module_exports_qualified(jobject from_module, const char* package,
559 jobject to_module, TRAPS) {
560 if (to_module == NULL) {
561 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
562 "to_module is null");
563 }
564 add_module_exports(from_module, package, to_module, CHECK);
565}
566
567void Modules::add_reads_module(jobject from_module, jobject to_module, TRAPS) {
568 if (from_module == NULL) {
569 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
570 "from_module is null");
571 }
572
573 ModuleEntry* from_module_entry = get_module_entry(from_module, CHECK);
574 if (from_module_entry == NULL) {
575 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
576 "from_module is not valid");
577 }
578
579 ModuleEntry* to_module_entry;
580 if (to_module != NULL) {
581 to_module_entry = get_module_entry(to_module, CHECK);
582 if (to_module_entry == NULL) {
583 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
584 "to_module is invalid");
585 }
586 } else {
587 to_module_entry = NULL;
588 }
589
590 ResourceMark rm(THREAD);
591 log_debug(module)("add_reads_module(): Adding read from module %s to module %s",
592 from_module_entry->is_named() ?
593 from_module_entry->name()->as_C_string() : UNNAMED_MODULE,
594 to_module_entry == NULL ? "all unnamed" :
595 (to_module_entry->is_named() ?
596 to_module_entry->name()->as_C_string() : UNNAMED_MODULE));
597
598 // if modules are the same or if from_module is unnamed then no need to add the read.
599 if (from_module_entry != to_module_entry && from_module_entry->is_named()) {
600 from_module_entry->add_read(to_module_entry);
601 }
602}
603
604// This method is called by JFR and JNI.
605jobject Modules::get_module(jclass clazz, TRAPS) {
606 assert(ModuleEntryTable::javabase_defined(),
607 "Attempt to call get_module before " JAVA_BASE_NAME " is defined");
608
609 if (clazz == NULL) {
610 THROW_MSG_(vmSymbols::java_lang_NullPointerException(),
611 "class is null", JNI_FALSE);
612 }
613 oop mirror = JNIHandles::resolve_non_null(clazz);
614 if (mirror == NULL) {
615 log_debug(module)("get_module(): no mirror, returning NULL");
616 return NULL;
617 }
618 if (!java_lang_Class::is_instance(mirror)) {
619 THROW_MSG_(vmSymbols::java_lang_IllegalArgumentException(),
620 "Invalid class", JNI_FALSE);
621 }
622
623 oop module = java_lang_Class::module(mirror);
624
625 assert(module != NULL, "java.lang.Class module field not set");
626 assert(java_lang_Module::is_instance(module), "module is not an instance of type java.lang.Module");
627
628 LogTarget(Debug,module) lt;
629 if (lt.is_enabled()) {
630 ResourceMark rm(THREAD);
631 LogStream ls(lt);
632 Klass* klass = java_lang_Class::as_Klass(mirror);
633 oop module_name = java_lang_Module::name(module);
634 if (module_name != NULL) {
635 ls.print("get_module(): module ");
636 java_lang_String::print(module_name, tty);
637 } else {
638 ls.print("get_module(): Unamed Module");
639 }
640 if (klass != NULL) {
641 ls.print_cr(" for class %s", klass->external_name());
642 } else {
643 ls.print_cr(" for primitive class");
644 }
645 }
646
647 return JNIHandles::make_local(THREAD, module);
648}
649
650jobject Modules::get_named_module(Handle h_loader, const char* package_name, TRAPS) {
651 assert(ModuleEntryTable::javabase_defined(),
652 "Attempt to call get_named_module before " JAVA_BASE_NAME " is defined");
653 assert(h_loader.is_null() || java_lang_ClassLoader::is_subclass(h_loader->klass()),
654 "Class loader is not a subclass of java.lang.ClassLoader");
655 assert(package_name != NULL, "the package_name should not be NULL");
656
657 if (strlen(package_name) == 0) {
658 return NULL;
659 }
660 TempNewSymbol package_sym = SymbolTable::new_symbol(package_name);
661 const PackageEntry* const pkg_entry =
662 get_package_entry_by_name(package_sym, h_loader, THREAD);
663 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
664
665 if (module_entry != NULL && module_entry->module() != NULL && module_entry->is_named()) {
666 return JNIHandles::make_local(THREAD, module_entry->module());
667 }
668 return NULL;
669}
670
671
672// This method is called by JFR and by the above method.
673jobject Modules::get_module(Symbol* package_name, Handle h_loader, TRAPS) {
674 const PackageEntry* const pkg_entry =
675 get_package_entry_by_name(package_name, h_loader, THREAD);
676 const ModuleEntry* const module_entry = (pkg_entry != NULL ? pkg_entry->module() : NULL);
677
678 if (module_entry != NULL &&
679 module_entry->module() != NULL) {
680 return JNIHandles::make_local(THREAD, module_entry->module());
681 }
682
683 return NULL;
684}
685
686// Export package in module to all unnamed modules.
687void Modules::add_module_exports_to_all_unnamed(jobject module, const char* package_name, TRAPS) {
688 if (module == NULL) {
689 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
690 "module is null");
691 }
692 if (package_name == NULL) {
693 THROW_MSG(vmSymbols::java_lang_NullPointerException(),
694 "package is null");
695 }
696 ModuleEntry* module_entry = get_module_entry(module, CHECK);
697 if (module_entry == NULL) {
698 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
699 "module is invalid");
700 }
701
702 if (module_entry->is_named()) { // No-op for unnamed module.
703 PackageEntry *package_entry = get_package_entry(module_entry, package_name, CHECK);
704 ResourceMark rm(THREAD);
705 if (package_entry == NULL) {
706 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
707 err_msg("Package %s not found in module %s",
708 package_name != NULL ? package_name : "",
709 module_entry->name()->as_C_string()));
710 }
711 if (package_entry->module() != module_entry) {
712 THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),
713 err_msg("Package: %s found in module %s, not in module: %s",
714 package_entry->name()->as_C_string(),
715 package_entry->module()->name()->as_C_string(),
716 module_entry->name()->as_C_string()));
717 }
718
719 log_debug(module)("add_module_exports_to_all_unnamed(): package %s in module"
720 " %s is exported to all unnamed modules",
721 package_entry->name()->as_C_string(),
722 module_entry->name()->as_C_string());
723
724 // Mark package as exported to all unnamed modules.
725 package_entry->set_is_exported_allUnnamed();
726 }
727}
728