1 /*

     2 * Copyright (c) 2016, 2017, 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 "classfile/classFileParser.hpp"

    27 #include "classfile/classLoader.hpp"

    28 #include "classfile/classLoaderData.inline.hpp"

    29 #include "classfile/javaAssertions.hpp"

    30 #include "classfile/javaClasses.hpp"

    31 #include "classfile/javaClasses.inline.hpp"

    32 #include "classfile/moduleEntry.hpp"

    33 #include "classfile/modules.hpp"

    34 #include "classfile/packageEntry.hpp"

    35 #include "classfile/stringTable.hpp"

    36 #include "classfile/symbolTable.hpp"

    37 #include "classfile/systemDictionary.hpp"

    38 #include "classfile/vmSymbols.hpp"

    39 #include "logging/log.hpp"

    40 #include "logging/logStream.hpp"

    41 #include "memory/resourceArea.hpp"

    42 #include "oops/instanceKlass.hpp"

    43 #include "prims/jvm.h"

    44 #include "runtime/arguments.hpp"

    45 #include "runtime/handles.inline.hpp"

    46 #include "runtime/javaCalls.hpp"

    47 #include "runtime/reflection.hpp"

    48 #include "utilities/stringUtils.hpp"

    49 #include "utilities/utf8.hpp"

    50 

    51 static bool verify_module_name(const char *module_name) {

    52   if (module_name == NULL) return false;

    53   int len = (int)strlen(module_name);

    54   return (len > 0 && len <= Symbol::max_length());

    55 }

    56 

    57 bool Modules::verify_package_name(const char* package_name) {

    58   if (package_name == NULL) return false;

    59   int len = (int)strlen(package_name);

    60   return (len > 0 && len <= Symbol::max_length() &&

    61     UTF8::is_legal_utf8((const unsigned char *)package_name, len, false) &&

    62     ClassFileParser::verify_unqualified_name(package_name, len,

    63     ClassFileParser::LegalClass));

    64 }

    65 

    66 static char* get_module_name(oop module, TRAPS) {

    67   oop name_oop = java_lang_Module::name(module);

    68   if (name_oop == NULL) {

    69     THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(), "Null module name");

    70   }

    71   char* module_name = java_lang_String::as_utf8_string(name_oop);

    72   if (!verify_module_name(module_name)) {

    73     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),

    74                    err_msg("Invalid module name: %s",

    75                            module_name != NULL ? module_name : "NULL"));

    76   }

    77   return module_name;

    78 }

    79 

    80 static const char* get_module_version(jstring version) {

    81   if (version == NULL) {

    82     return NULL;

    83   }

    84   return java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(version));

    85 }

    86 

    87 static ModuleEntryTable* get_module_entry_table(Handle h_loader, TRAPS) {

    88   // This code can be called during start-up, before the classLoader's classLoader data got

    89   // created.  So, call register_loader() to make sure the classLoader data gets created.

    90   ClassLoaderData *loader_cld = SystemDictionary::register_loader(h_loader, CHECK_NULL);

    91   return loader_cld->modules();

    92 }

    93 

    94 static PackageEntryTable* get_package_entry_table(Handle h_loader, TRAPS) {

    95   // This code can be called during start-up, before the classLoader's classLoader data got

    96   // created.  So, call register_loader() to make sure the classLoader data gets created.

    97   ClassLoaderData *loader_cld = SystemDictionary::register_loader(h_loader, CHECK_NULL);

    98   return loader_cld->packages();

    99 }

   100 

   101 static ModuleEntry* get_module_entry(jobject module, TRAPS) {

   102   Handle module_h(THREAD, JNIHandles::resolve(module));

   103   if (!java_lang_Module::is_instance(module_h())) {

   104     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(),

   105                    "module is not an instance of type java.lang.Module");

   106   }

   107   return java_lang_Module::module_entry(module_h(), CHECK_NULL);

   108 }

   109 

   110 static PackageEntry* get_package_entry(ModuleEntry* module_entry, const char* package_name, TRAPS) {

   111   ResourceMark rm(THREAD);

   112   if (package_name == NULL) return NULL;

   113   TempNewSymbol pkg_symbol = SymbolTable::new_symbol(package_name, CHECK_NULL);

   114   PackageEntryTable* package_entry_table = module_entry->loader_data()->packages();

   115   assert(package_entry_table != NULL, "Unexpected null package entry table");

   116   return package_entry_table->lookup_only(pkg_symbol);

   117 }

   118 

   119 static PackageEntry* get_package_entry_by_name(Symbol* package,

   120                                                Handle h_loader,

   121                                                TRAPS) {

   122   if (package != NULL) {

   123     ResourceMark rm(THREAD);

   124     if (Modules::verify_package_name(package->as_C_string())) {

   125       PackageEntryTable* const package_entry_table =

   126         get_package_entry_table(h_loader, CHECK_NULL);

   127       assert(package_entry_table != NULL, "Unexpected null package entry table");

   128       return package_entry_table->lookup_only(package);

   129     }

   130   }

   131   return NULL;

   132 }

   133 

   134 bool Modules::is_package_defined(Symbol* package, Handle h_loader, TRAPS) {

   135   PackageEntry* res = get_package_entry_by_name(package, h_loader, CHECK_false);

   136   return res != NULL;

   137 }

   138 

   139 static void define_javabase_module(jobject module, jstring version,

   140                                    jstring location, const char* const* packages,

   141                                    jsize num_packages, TRAPS) {

   142   ResourceMark rm(THREAD);

   143 

   144   Handle module_handle(THREAD, JNIHandles::resolve(module));

   145 

   146   // Obtain java.base's module version

   147   const char* module_version = get_module_version(version);

   148   TempNewSymbol version_symbol;

   149   if (module_version != NULL) {

   150     version_symbol = SymbolTable::new_symbol(module_version, CHECK);

   151   } else {

   152     version_symbol = NULL;

   153   }

   154 

   155   // Obtain java.base's location

   156   const char* module_location = NULL;

   157   TempNewSymbol location_symbol = NULL;

   158   if (location != NULL) {

   159     module_location =

   160       java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(location));

   161     if (module_location != NULL) {

   162       location_symbol = SymbolTable::new_symbol(module_location, CHECK);

   163     }

   164   }

   165 

   166 

   167   // Check that the packages are syntactically ok.

   168   GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);

   169   for (int x = 0; x < num_packages; x++) {

   170     const char *package_name = packages[x];

   171     if (!Modules::verify_package_name(package_name)) {

   172       THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),

   173                 err_msg("Invalid package name: %s for module: " JAVA_BASE_NAME, package_name));

   174     }

   175     Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);

   176     pkg_list->append(pkg_symbol);

   177   }

   178 

   179   // Validate java_base's loader is the boot loader.

   180   oop loader = java_lang_Module::loader(module_handle());

   181   if (loader != NULL) {

   182     THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),

   183               "Class loader must be the boot class loader");

   184   }

   185   Handle h_loader(THREAD, loader);

   186 

   187   // Ensure the boot loader's PackageEntryTable has been created

   188   PackageEntryTable* package_table = get_package_entry_table(h_loader, CHECK);

   189   assert(pkg_list->length() == 0 || package_table != NULL, "Bad package_table");

   190 

   191   // Ensure java.base's ModuleEntry has been created

   192   assert(ModuleEntryTable::javabase_moduleEntry() != NULL, "No ModuleEntry for " JAVA_BASE_NAME);

   193 

   194   bool duplicate_javabase = false;

   195   {

   196     MutexLocker m1(Module_lock, THREAD);

   197 

   198     if (ModuleEntryTable::javabase_defined()) {

   199       duplicate_javabase = true;

   200     } else {

   201 

   202       // Verify that all java.base packages created during bootstrapping are in

   203       // pkg_list.  If any are not in pkg_list, than a non-java.base class was

   204       // loaded erroneously pre java.base module definition.

   205       package_table->verify_javabase_packages(pkg_list);

   206 

   207       // loop through and add any new packages for java.base

   208       PackageEntry* pkg;

   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         if (package_table->lookup_only(pkg_list->at(x)) == NULL) {

   212           pkg = package_table->locked_create_entry_or_null(pkg_list->at(x), ModuleEntryTable::javabase_moduleEntry());

   213           assert(pkg != NULL, "Unable to create a " JAVA_BASE_NAME " package entry");

   214         }

   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.

   254 void 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 

   267 void 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 (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 

   315   // Check that the list of packages has no duplicates and that the

   316   // packages are syntactically ok.

   317   GrowableArray<Symbol*>* pkg_list = new GrowableArray<Symbol*>(num_packages);

   318   for (int x = 0; x < num_packages; x++) {

   319     const char* package_name = packages[x];

   320     if (!verify_package_name(package_name)) {

   321       THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(),

   322                 err_msg("Invalid package name: %s for module: %s",

   323                         package_name, module_name));

   324     }

   325 

   326     // Only modules defined to either the boot or platform class loader, can define a "java/" package.

   327     if (!h_loader.is_null() &&

   328         !SystemDictionary::is_platform_class_loader(h_loader()) &&

   329         (strncmp(package_name, JAVAPKG, JAVAPKG_LEN) == 0 &&

   330           (package_name[JAVAPKG_LEN] == '/' || package_name[JAVAPKG_LEN] == '\0'))) {

   331       const char* class_loader_name = SystemDictionary::loader_name(h_loader());

   332       size_t pkg_len = strlen(package_name);

   333       char* pkg_name = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, pkg_len);

   334       strncpy(pkg_name, package_name, pkg_len);

   335       StringUtils::replace_no_expand(pkg_name, "/", ".");

   336       const char* msg_text1 = "Class loader (instance of): ";

   337       const char* msg_text2 = " tried to define prohibited package name: ";

   338       size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + pkg_len + 1;

   339       char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);

   340       jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, pkg_name);

   341       THROW_MSG(vmSymbols::java_lang_IllegalArgumentException(), message);

   342     }

   343 

   344     Symbol* pkg_symbol = SymbolTable::new_symbol(package_name, CHECK);

   345     pkg_list->append(pkg_symbol);

   346   }

   347 

   348   ModuleEntryTable* module_table = get_module_entry_table(h_loader, CHECK);

   349   assert(module_table != NULL, "module entry table shouldn't be null");

   350 

   351   // Create symbol* entry for module name.

   352   TempNewSymbol module_symbol = SymbolTable::new_symbol(module_name, CHECK);

   353 

   354   bool dupl_modules = false;

   355 

   356   // Create symbol* entry for module version.

   357   TempNewSymbol version_symbol;

   358   if (module_version != NULL) {

   359     version_symbol = SymbolTable::new_symbol(module_version, CHECK);

   360   } else {

   361     version_symbol = NULL;

   362   }

   363 

   364   // Create symbol* entry for module location.

   365   const char* module_location = NULL;

   366   TempNewSymbol location_symbol = NULL;

   367   if (location != NULL) {

   368     module_location =

   369       java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(location));

   370     if (module_location != NULL) {

   371       location_symbol = SymbolTable::new_symbol(module_location, CHECK);

   372     }

   373   }

   374 

   375   ClassLoaderData* loader_data = ClassLoaderData::class_loader_data_or_null(h_loader());

   376   assert(loader_data != NULL, "class loader data shouldn't be null");

   377 

   378   PackageEntryTable* package_table = NULL;

   379   PackageEntry* existing_pkg = NULL;

   380   {

   381     MutexLocker ml(Module_lock, THREAD);

   382 

   383     if (num_packages > 0) {

   384       package_table = get_package_entry_table(h_loader, CHECK);

   385       assert(package_table != NULL, "Missing package_table");

   386 

   387       // Check that none of the packages exist in the class loader's package table.

   388       for (int x = 0; x < pkg_list->length(); x++) {

   389         existing_pkg = package_table->lookup_only(pkg_list->at(x));

   390         if (existing_pkg != NULL) {

   391           // This could be because the module was already defined.  If so,

   392           // report that error instead of the package error.

   393           if (module_table->lookup_only(module_symbol) != NULL) {

   394             dupl_modules = true;

   395           }

   396           break;

   397         }

   398       }

   399     }  // if (num_packages > 0)...

   400 

   401     // Add the module and its packages.

   402     if (!dupl_modules && existing_pkg == NULL) {

   403       // Create the entry for this module in the class loader's module entry table.

   404       ModuleEntry* module_entry = module_table->locked_create_entry_or_null(module_handle,

   405                                     (is_open == JNI_TRUE), module_symbol,

   406                                     version_symbol, location_symbol, loader_data);

   407 

   408       if (module_entry == NULL) {

   409         dupl_modules = true;

   410       } else {

   411         // Add the packages.

   412         assert(pkg_list->length() == 0 || package_table != NULL, "Bad package table");

   413         PackageEntry* pkg;

   414         for (int y = 0; y < pkg_list->length(); y++) {

   415           pkg = package_table->locked_create_entry_or_null(pkg_list->at(y), module_entry);

   416           assert(pkg != NULL, "Unable to create a module's package entry");

   417 

   418           // Unable to have a GrowableArray of TempNewSymbol.  Must decrement the refcount of

   419           // the Symbol* that was created above for each package. The refcount was incremented

   420           // by SymbolTable::new_symbol and as well by the PackageEntry creation.

   421           pkg_list->at(y)->decrement_refcount();

   422         }

   423 

   424         // Store pointer to ModuleEntry record in java.lang.Module object.

   425         java_lang_Module::set_module_entry(module_handle(), module_entry);

   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 

   461 void 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 

   499 void 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 

   558 void 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 

   567 void 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.

   605 jobject 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 

   650 jobject 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, CHECK_NULL);

   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.

   673 jobject 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.

   687 void 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 }