79 #include "utilities/events.hpp"
80 #include "utilities/macros.hpp"
81 #include "utilities/ostream.hpp"
82 #include "utilities/utf8.hpp"
83
84 #include <ctype.h>
85
86 // Entry point in java.dll for path canonicalization
87
88 typedef int (*canonicalize_fn_t)(const char *orig, char *out, int len);
89
90 static canonicalize_fn_t CanonicalizeEntry = nullptr;
91
92 // Entry points for jimage.dll for loading jimage file entries
93
94 static JImageOpen_t JImageOpen = nullptr;
95 static JImageClose_t JImageClose = nullptr;
96 static JImageFindResource_t JImageFindResource = nullptr;
97 static JImageGetResource_t JImageGetResource = nullptr;
98
99 // JimageFile pointer, or null if exploded JDK build.
100 static JImageFile* JImage_file = nullptr;
101
102 // Globals
103
104 PerfCounter* ClassLoader::_perf_accumulated_time = nullptr;
105 PerfCounter* ClassLoader::_perf_classes_inited = nullptr;
106 PerfCounter* ClassLoader::_perf_class_init_time = nullptr;
107 PerfCounter* ClassLoader::_perf_class_init_selftime = nullptr;
108 PerfCounter* ClassLoader::_perf_classes_verified = nullptr;
109 PerfCounter* ClassLoader::_perf_class_verify_time = nullptr;
110 PerfCounter* ClassLoader::_perf_class_verify_selftime = nullptr;
111 PerfCounter* ClassLoader::_perf_classes_linked = nullptr;
112 PerfCounter* ClassLoader::_perf_class_link_time = nullptr;
113 PerfCounter* ClassLoader::_perf_class_link_selftime = nullptr;
114 PerfCounter* ClassLoader::_perf_shared_classload_time = nullptr;
115 PerfCounter* ClassLoader::_perf_sys_classload_time = nullptr;
116 PerfCounter* ClassLoader::_perf_app_classload_time = nullptr;
117 PerfCounter* ClassLoader::_perf_app_classload_selftime = nullptr;
118 PerfCounter* ClassLoader::_perf_app_classload_count = nullptr;
119 PerfCounter* ClassLoader::_perf_define_appclasses = nullptr;
120 PerfCounter* ClassLoader::_perf_define_appclass_time = nullptr;
121 PerfCounter* ClassLoader::_perf_define_appclass_selftime = nullptr;
137 PerfCounter* ClassLoader::_perf_resolve_indy_count = nullptr;
138 PerfCounter* ClassLoader::_perf_resolve_invokehandle_count = nullptr;
139 PerfCounter* ClassLoader::_perf_resolve_mh_count = nullptr;
140 PerfCounter* ClassLoader::_perf_resolve_mt_count = nullptr;
141
142 void ClassLoader::print_counters(outputStream *st) {
143 st->print_cr("ClassLoader:");
144 st->print_cr(" clinit: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", ClassLoader::class_init_time_ms(), ClassLoader::class_init_count());
145 st->print_cr(" link methods: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_ik_link_methods_time->get_value()) , _perf_ik_link_methods_count->get_value());
146 st->print_cr(" method adapters: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_method_adapters_time->get_value()) , _perf_method_adapters_count->get_value());
147 st->print_cr(" resolve...");
148 st->print_cr(" invokedynamic: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_resolve_indy_time->get_value()) , _perf_resolve_indy_count->get_value());
149 st->print_cr(" invokehandle: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_resolve_invokehandle_time->get_value()) , _perf_resolve_invokehandle_count->get_value());
150 st->print_cr(" CP_MethodHandle: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_resolve_mh_time->get_value()) , _perf_resolve_mh_count->get_value());
151 st->print_cr(" CP_MethodType: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_resolve_mt_time->get_value()) , _perf_resolve_mt_count->get_value());
152 st->cr();
153 }
154
155 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = nullptr;
156 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = nullptr;
157 ClassPathEntry* ClassLoader::_jrt_entry = nullptr;
158
159 ClassPathEntry* volatile ClassLoader::_first_append_entry_list = nullptr;
160 ClassPathEntry* volatile ClassLoader::_last_append_entry = nullptr;
161
162 // helper routines
163 #if INCLUDE_CDS
164 static bool string_starts_with(const char* str, const char* str_to_find) {
165 size_t str_len = strlen(str);
166 size_t str_to_find_len = strlen(str_to_find);
167 if (str_to_find_len > str_len) {
168 return false;
169 }
170 return (strncmp(str, str_to_find, str_to_find_len) == 0);
171 }
172 #endif
173
174 static const char* get_jimage_version_string() {
175 static char version_string[10] = "";
176 if (version_string[0] == '\0') {
177 jio_snprintf(version_string, sizeof(version_string), "%d.%d",
178 VM_Version::vm_major_version(), VM_Version::vm_minor_version());
179 }
180 return (const char*)version_string;
181 }
182
183 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
184 size_t str_len = strlen(str);
185 size_t str_to_find_len = strlen(str_to_find);
186 if (str_to_find_len > str_len) {
187 return false;
188 }
189 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
190 }
191
192 // Used to obtain the package name from a fully qualified class name.
193 Symbol* ClassLoader::package_from_class_name(const Symbol* name, bool* bad_class_name) {
194 if (name == nullptr) {
195 if (bad_class_name != nullptr) {
196 *bad_class_name = true;
197 }
198 return nullptr;
199 }
200
201 int utf_len = name->utf8_length();
202 const jbyte* base = (const jbyte*)name->base();
217 // In this situation, is_same_class_package returns false.
218 if (*start == JVM_SIGNATURE_CLASS) {
219 if (bad_class_name != nullptr) {
220 *bad_class_name = true;
221 }
222 return nullptr;
223 }
224 }
225 // A class name could have just the slash character in the name,
226 // in which case start > end
227 if (start >= end) {
228 // No package name
229 if (bad_class_name != nullptr) {
230 *bad_class_name = true;
231 }
232 return nullptr;
233 }
234 return SymbolTable::new_symbol(name, pointer_delta_as_int(start, base), pointer_delta_as_int(end, base));
235 }
236
237 // Given a fully qualified package name, find its defining package in the class loader's
238 // package entry table.
239 PackageEntry* ClassLoader::get_package_entry(Symbol* pkg_name, ClassLoaderData* loader_data) {
240 if (pkg_name == nullptr) {
241 return nullptr;
242 }
243 PackageEntryTable* pkgEntryTable = loader_data->packages();
244 return pkgEntryTable->lookup_only(pkg_name);
245 }
246
247 const char* ClassPathEntry::copy_path(const char* path) {
248 char* copy = NEW_C_HEAP_ARRAY(char, strlen(path)+1, mtClass);
249 strcpy(copy, path);
250 return copy;
251 }
252
253 ClassPathDirEntry::~ClassPathDirEntry() {
254 FREE_C_HEAP_ARRAY(_dir);
255 }
256
355 return buffer;
356 }
357
358 ClassFileStream* ClassPathZipEntry::open_stream(JavaThread* current, const char* name) {
359 jint filesize;
360 u1* buffer = open_entry(current, name, &filesize, false);
361 if (buffer == nullptr) {
362 return nullptr;
363 }
364 if (UsePerfData) {
365 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
366 }
367 // Resource allocated
368 return new ClassFileStream(buffer,
369 filesize,
370 _zip_name);
371 }
372
373 DEBUG_ONLY(ClassPathImageEntry* ClassPathImageEntry::_singleton = nullptr;)
374
375 JImageFile* ClassPathImageEntry::jimage() const {
376 return JImage_file;
377 }
378
379 JImageFile* ClassPathImageEntry::jimage_non_null() const {
380 assert(ClassLoader::has_jrt_entry(), "must be");
381 assert(jimage() != nullptr, "should have been opened by ClassLoader::lookup_vm_options "
382 "and remained throughout normal JVM lifetime");
383 return jimage();
384 }
385
386 void ClassPathImageEntry::close_jimage() {
387 if (jimage() != nullptr) {
388 (*JImageClose)(jimage());
389 JImage_file = nullptr;
390 }
391 }
392
393 ClassPathImageEntry::ClassPathImageEntry(JImageFile* jimage, const char* name) :
394 ClassPathEntry() {
395 guarantee(jimage != nullptr, "jimage file is null");
396 guarantee(name != nullptr, "jimage file name is null");
397 assert(_singleton == nullptr, "VM supports only one jimage");
398 DEBUG_ONLY(_singleton = this);
399 size_t len = strlen(name) + 1;
400 _name = copy_path(name);
401 }
402
403 ClassFileStream* ClassPathImageEntry::open_stream(JavaThread* current, const char* name) {
404 return open_stream_for_loader(current, name, ClassLoaderData::the_null_class_loader_data());
405 }
406
407 // For a class in a named module, look it up in the jimage file using this syntax:
408 // /<module-name>/<package-name>/<base-class>
409 //
410 // Assumptions:
411 // 1. There are no unnamed modules in the jimage file.
412 // 2. A package is in at most one module in the jimage file.
413 //
414 ClassFileStream* ClassPathImageEntry::open_stream_for_loader(JavaThread* current, const char* name, ClassLoaderData* loader_data) {
415 jlong size;
416 JImageLocationRef location = 0;
417
418 TempNewSymbol class_name = SymbolTable::new_symbol(name);
419 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name);
420
421 if (pkg_name != nullptr) {
422 if (!Universe::is_module_initialized()) {
423 location = (*JImageFindResource)(jimage_non_null(), JAVA_BASE_NAME, get_jimage_version_string(), name, &size);
424 } else {
425 PackageEntry* package_entry = ClassLoader::get_package_entry(pkg_name, loader_data);
426 if (package_entry != nullptr) {
427 ResourceMark rm(current);
428 // Get the module name
429 ModuleEntry* module = package_entry->module();
430 assert(module != nullptr, "Boot classLoader package missing module");
431 assert(module->is_named(), "Boot classLoader package is in unnamed module");
432 const char* module_name = module->name()->as_C_string();
433 if (module_name != nullptr) {
434 location = (*JImageFindResource)(jimage_non_null(), module_name, get_jimage_version_string(), name, &size);
435 }
436 }
437 }
438 }
439
440 if (location != 0) {
441 if (UsePerfData) {
442 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
443 }
444 char* data = NEW_RESOURCE_ARRAY(char, size);
445 (*JImageGetResource)(jimage_non_null(), location, data, size);
446 // Resource allocated
447 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be");
448 return new ClassFileStream((u1*)data,
449 checked_cast<int>(size),
450 _name,
451 true); // from_boot_loader_modules_image
452 }
453
454 return nullptr;
455 }
456
457 JImageLocationRef ClassLoader::jimage_find_resource(JImageFile* jf,
458 const char* module_name,
459 const char* file_name,
460 jlong &size) {
461 return ((*JImageFindResource)(jf, module_name, get_jimage_version_string(), file_name, &size));
462 }
463
464 bool ClassPathImageEntry::is_modules_image() const {
465 assert(this == _singleton, "VM supports a single jimage");
466 assert(this == (ClassPathImageEntry*)ClassLoader::get_jrt_entry(), "must be used for jrt entry");
467 return true;
468 }
469
470 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
471 _module_name = module_name;
472 _module_first_entry = nullptr;
473 _module_last_entry = nullptr;
474 }
475
476 ModuleClassPathList::~ModuleClassPathList() {
477 // Clean out each ClassPathEntry on list
478 ClassPathEntry* e = _module_first_entry;
479 while (e != nullptr) {
480 ClassPathEntry* next_entry = e->next();
481 delete e;
482 e = next_entry;
483 }
484 }
485
486 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
601 #if INCLUDE_CDS
602 if (CDSConfig::is_dumping_archive()) {
603 if (!Arguments::has_jimage()) {
604 vm_exit_during_initialization("CDS is not supported in exploded JDK build", nullptr);
605 }
606 }
607 #endif
608
609 while (cp_stream.has_next()) {
610 const char* path = cp_stream.get_next();
611
612 if (set_base_piece) {
613 // The first time through the bootstrap_search setup, it must be determined
614 // what the base or core piece of the boot loader search is. Either a java runtime
615 // image is present or this is an exploded module build situation.
616 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
617 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
618 struct stat st;
619 if (os::stat(path, &st) == 0) {
620 // Directory found
621 if (JImage_file != nullptr) {
622 assert(Arguments::has_jimage(), "sanity check");
623 const char* canonical_path = get_canonical_path(path, current);
624 assert(canonical_path != nullptr, "canonical_path issue");
625
626 _jrt_entry = new ClassPathImageEntry(JImage_file, canonical_path);
627 assert(_jrt_entry != nullptr && _jrt_entry->is_modules_image(), "No java runtime image present");
628 assert(_jrt_entry->jimage() != nullptr, "No java runtime image");
629 } // else it's an exploded build.
630 } else {
631 // If path does not exist, exit
632 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
633 }
634 set_base_piece = false;
635 } else {
636 // Every entry on the boot class path after the initial base piece,
637 // which is set by os::set_boot_path(), is considered an appended entry.
638 update_class_path_entry_list(current, path);
639 }
640 }
641 }
642
643 // Gets the exploded path for the named module. The memory for the path
644 // is allocated on the C heap if `c_heap` is true otherwise in the resource area.
645 static const char* get_exploded_module_path(const char* module_name, bool c_heap) {
646 const char *home = Arguments::get_java_home();
647 const char file_sep = os::file_separator()[0];
648 // 10 represents the length of "modules" + 2 file separators + \0
649 size_t len = strlen(home) + strlen(module_name) + 10;
650 char *path = c_heap ? NEW_C_HEAP_ARRAY(char, len, mtModule) : NEW_RESOURCE_ARRAY(char, len);
651 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
652 return path;
653 }
654
655 // During an exploded modules build, each module defined to the boot loader
656 // will be added to the ClassLoader::_exploded_entries array.
657 void ClassLoader::add_to_exploded_build_list(JavaThread* current, Symbol* module_sym) {
658 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
659 assert(_exploded_entries != nullptr, "_exploded_entries was not initialized");
660
661 // Find the module's symbol
662 ResourceMark rm(current);
663 const char *module_name = module_sym->as_C_string();
664 const char *path = get_exploded_module_path(module_name, false);
665
666 struct stat st;
667 if (os::stat(path, &st) == 0) {
668 // Directory found
669 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st);
670
671 // If the path specification is valid, enter it into this module's list.
672 // There is no need to check for duplicate modules in the exploded entry list,
673 // since no two modules with the same name can be defined to the boot loader.
674 // This is checked at module definition time in Modules::define_module.
675 if (new_entry != nullptr) {
676 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
677 module_cpl->add_to_list(new_entry);
678 {
679 MutexLocker ml(current, Module_lock);
680 _exploded_entries->push(module_cpl);
681 }
682 log_info(class, load)("path: %s", path);
683 }
684 }
685 }
686
687 jzfile* ClassLoader::open_zip_file(const char* canonical_path, char** error_msg, JavaThread* thread) {
688 // enable call to C land
689 ThreadToNativeFromVM ttn(thread);
690 HandleMark hm(thread);
691 return ZipLibrary::open(canonical_path, error_msg);
692 }
693
694 ClassPathEntry* ClassLoader::create_class_path_entry(JavaThread* current,
695 const char *path, const struct stat* st) {
696 ClassPathEntry* new_entry = nullptr;
697 if ((st->st_mode & S_IFMT) == S_IFREG) {
698 ResourceMark rm(current);
699 // Regular file, should be a zip file
700 // Canonicalized filename
701 const char* canonical_path = get_canonical_path(path, current);
702 if (canonical_path == nullptr) {
901
902 // Return null if package does not exist or if no classes in that package
903 // have been loaded.
904 if (package != nullptr && package->has_loaded_class()) {
905 ModuleEntry* module = package->module();
906 if (module->location() != nullptr) {
907 ResourceMark rm(THREAD);
908 Handle ml = java_lang_String::create_from_str(
909 module->location()->as_C_string(), THREAD);
910 return ml();
911 }
912 // Return entry on boot loader class path.
913 Handle cph = java_lang_String::create_from_str(
914 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
915 return cph();
916 }
917 }
918 return nullptr;
919 }
920
921 objArrayOop ClassLoader::get_system_packages(TRAPS) {
922 ResourceMark rm(THREAD);
923 // List of pointers to PackageEntrys that have loaded classes.
924 PackageEntryTable* pe_table =
925 ClassLoaderData::the_null_class_loader_data()->packages();
926 GrowableArray<PackageEntry*>* loaded_class_pkgs = pe_table->get_system_packages();
927
928 // Allocate objArray and fill with java.lang.String
929 objArrayOop r = oopFactory::new_objArray(vmClasses::String_klass(),
930 loaded_class_pkgs->length(), CHECK_NULL);
931 objArrayHandle result(THREAD, r);
932 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
933 PackageEntry* package_entry = loaded_class_pkgs->at(x);
934 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
935 result->obj_at_put(x, str());
936 }
937 return result();
938 }
939
940 // caller needs ResourceMark
941 const char* ClassLoader::file_name_for_class_name(const char* class_name,
942 int class_name_len) {
943 assert(class_name != nullptr, "invariant");
944 assert((int)strlen(class_name) == class_name_len, "invariant");
945
946 static const char class_suffix[] = ".class";
947 size_t class_suffix_len = sizeof(class_suffix);
948
949 char* const file_name = NEW_RESOURCE_ARRAY(char,
950 class_name_len +
951 class_suffix_len); // includes term null
1028
1029 // Called by the boot classloader to load classes
1030 InstanceKlass* ClassLoader::load_class(Symbol* name, PackageEntry* pkg_entry, bool search_append_only, TRAPS) {
1031 assert(name != nullptr, "invariant");
1032
1033 ResourceMark rm(THREAD);
1034 HandleMark hm(THREAD);
1035
1036 const char* const class_name = name->as_C_string();
1037
1038 EventMarkClassLoading m("Loading class %s", class_name);
1039
1040 const char* const file_name = file_name_for_class_name(class_name,
1041 name->utf8_length());
1042 assert(file_name != nullptr, "invariant");
1043
1044 // Lookup stream for parsing .class file
1045 ClassFileStream* stream = nullptr;
1046 s2 classpath_index = 0;
1047 ClassPathEntry* e = nullptr;
1048
1049 // If search_append_only is true, boot loader visibility boundaries are
1050 // set to be _first_append_entry to the end. This includes:
1051 // [-Xbootclasspath/a]; [jvmti appended entries]
1052 //
1053 // If search_append_only is false, boot loader visibility boundaries are
1054 // set to be the --patch-module entries plus the base piece. This includes:
1055 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1056 //
1057
1058 // Load Attempt #1: --patch-module
1059 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1060 // attempt to load the class from those locations specific to the module.
1061 // Specifications to --patch-module can contain a partial number of classes
1062 // that are part of the overall module definition. So if a particular class is not
1063 // found within its module specification, the search should continue to Load Attempt #2.
1064 // Note: The --patch-module entries are never searched if the boot loader's
1065 // visibility boundary is limited to only searching the append entries.
1066 if (_patch_mod_entries != nullptr && !search_append_only) {
1067 assert(!CDSConfig::is_dumping_archive(), "CDS doesn't support --patch-module during dumping");
1068 stream = search_module_entries(THREAD, _patch_mod_entries, pkg_entry, file_name);
1069 }
1070
1071 // Load Attempt #2: [jimage | exploded build]
1072 if (!search_append_only && (nullptr == stream)) {
1073 if (has_jrt_entry()) {
1074 e = _jrt_entry;
1075 stream = _jrt_entry->open_stream(THREAD, file_name);
1076 } else {
1077 // Exploded build - attempt to locate class in its defining module's location.
1078 assert(_exploded_entries != nullptr, "No exploded build entries present");
1079 assert(!CDSConfig::is_dumping_archive(), "CDS dumping doesn't support exploded build");
1080 stream = search_module_entries(THREAD, _exploded_entries, pkg_entry, file_name);
1081 }
1082 }
1083
1084 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1085 if (search_append_only && (nullptr == stream)) {
1086 // For the boot loader append path search, the starting classpath_index
1087 // for the appended piece is always 1 to account for either the
1088 // _jrt_entry or the _exploded_entries.
1097 }
1098 e = e->next();
1099 ++classpath_index;
1100 }
1101 }
1102
1103 if (nullptr == stream) {
1104 return nullptr;
1105 }
1106
1107 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1108 Handle protection_domain;
1109 ClassLoadInfo cl_info(protection_domain);
1110
1111 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1112 name,
1113 loader_data,
1114 cl_info,
1115 CHECK_NULL);
1116 result->set_classpath_index(classpath_index);
1117 return result;
1118 }
1119
1120 #if INCLUDE_CDS
1121 static const char* skip_uri_protocol(const char* source) {
1122 if (strncmp(source, "file:", 5) == 0) {
1123 // file: protocol path could start with file:/ or file:///
1124 // locate the char after all the forward slashes
1125 int offset = 5;
1126 while (*(source + offset) == '/') {
1127 offset++;
1128 }
1129 source += offset;
1130 // for non-windows platforms, move back one char as the path begins with a '/'
1131 #ifndef _WINDOWS
1132 source -= 1;
1133 #endif
1134 } else if (strncmp(source, "jrt:/", 5) == 0) {
1135 source += 5;
1136 }
1173 for (size_t i = 0; i < strlen(uri); ++i) {
1174 char decoded = decode_percent_encoded(uri, i);
1175 path[path_index++] = decoded;
1176 }
1177 path[path_index] = '\0';
1178 return path;
1179 }
1180
1181 // Record the shared classpath index and loader type for classes loaded
1182 // by the builtin loaders at dump time.
1183 void ClassLoader::record_result(JavaThread* current, InstanceKlass* ik,
1184 const ClassFileStream* stream, bool redefined) {
1185 assert(CDSConfig::is_dumping_archive(), "sanity");
1186 assert(stream != nullptr, "sanity");
1187
1188 if (ik->is_hidden()) {
1189 record_hidden_class(ik);
1190 return;
1191 }
1192
1193 oop loader = ik->class_loader();
1194 char* src = (char*)stream->source();
1195 if (src == nullptr) {
1196 ik->set_shared_classpath_index(-1); // unsupported location
1197 return;
1198 }
1199
1200 if (!SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
1201 // A class loaded by a user-defined classloader.
1202 assert(ik->shared_classpath_index() < 0, "not assigned yet");
1203 ik->set_shared_classpath_index(UNREGISTERED_INDEX);
1204 SystemDictionaryShared::set_shared_class_misc_info(ik, (ClassFileStream*)stream);
1205 return;
1206 }
1207
1208 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1209
1210 ResourceMark rm(current);
1211 int classpath_index = -1;
1212 bool found_invalid = false;
1381 NEWPERFEVENTCOUNTER(_perf_method_adapters_count, SUN_CLS, "makeAdaptersCount");
1382
1383 NEWPERFTICKCOUNTER(_perf_resolve_indy_time, SUN_CLS, "resolve_invokedynamic_time");
1384 NEWPERFTICKCOUNTER(_perf_resolve_invokehandle_time, SUN_CLS, "resolve_invokehandle_time");
1385 NEWPERFTICKCOUNTER(_perf_resolve_mh_time, SUN_CLS, "resolve_MethodHandle_time");
1386 NEWPERFTICKCOUNTER(_perf_resolve_mt_time, SUN_CLS, "resolve_MethodType_time");
1387
1388 NEWPERFEVENTCOUNTER(_perf_resolve_indy_count, SUN_CLS, "resolve_invokedynamic_count");
1389 NEWPERFEVENTCOUNTER(_perf_resolve_invokehandle_count, SUN_CLS, "resolve_invokehandle_count");
1390 NEWPERFEVENTCOUNTER(_perf_resolve_mh_count, SUN_CLS, "resolve_MethodHandle_count");
1391 NEWPERFEVENTCOUNTER(_perf_resolve_mt_count, SUN_CLS, "resolve_MethodType_count");
1392 }
1393 }
1394
1395 // lookup java library entry points
1396 load_java_library();
1397 // jimage library entry points are loaded below, in lookup_vm_options
1398 setup_bootstrap_search_path(THREAD);
1399 }
1400
1401 static char* lookup_vm_resource(JImageFile *jimage, const char *jimage_version, const char *path) {
1402 jlong size;
1403 JImageLocationRef location = (*JImageFindResource)(jimage, "java.base", jimage_version, path, &size);
1404 if (location == 0)
1405 return nullptr;
1406 char *val = NEW_C_HEAP_ARRAY(char, size+1, mtClass);
1407 (*JImageGetResource)(jimage, location, val, size);
1408 val[size] = '\0';
1409 return val;
1410 }
1411
1412 // Lookup VM options embedded in the modules jimage file
1413 char* ClassLoader::lookup_vm_options() {
1414 jint error;
1415 char modules_path[JVM_MAXPATHLEN];
1416 const char* fileSep = os::file_separator();
1417
1418 // Initialize jimage library entry points
1419 load_jimage_library();
1420
1421 jio_snprintf(modules_path, JVM_MAXPATHLEN, "%s%slib%smodules", Arguments::get_java_home(), fileSep, fileSep);
1422 JImage_file =(*JImageOpen)(modules_path, &error);
1423 if (JImage_file == nullptr) {
1424 if (Arguments::has_jimage()) {
1425 // The modules file exists but is unreadable or corrupt
1426 vm_exit_during_initialization(err_msg("Unable to load %s", modules_path));
1427 }
1428 return nullptr;
1429 }
1430
1431 const char *jimage_version = get_jimage_version_string();
1432 char *options = lookup_vm_resource(JImage_file, jimage_version, "jdk/internal/vm/options");
1433 return options;
1434 }
1435
1436 bool ClassLoader::is_module_observable(const char* module_name) {
1437 assert(JImageOpen != nullptr, "jimage library should have been opened");
1438 if (JImage_file == nullptr) {
1439 struct stat st;
1440 const char *path = get_exploded_module_path(module_name, true);
1441 bool res = os::stat(path, &st) == 0;
1442 FREE_C_HEAP_ARRAY(path);
1443 return res;
1444 }
1445 jlong size;
1446 const char *jimage_version = get_jimage_version_string();
1447 return (*JImageFindResource)(JImage_file, module_name, jimage_version, "module-info.class", &size) != 0;
1448 }
1449
1450 jlong ClassLoader::classloader_time_ms() {
1451 return UsePerfData ?
1452 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1453 }
1454
1455 jlong ClassLoader::class_init_count() {
1456 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1457 }
1458
1459 jlong ClassLoader::class_init_time_ms() {
1460 return UsePerfData ?
1461 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1462 }
1463
1464 jlong ClassLoader::class_verify_time_ms() {
1465 return UsePerfData ?
1466 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1467 }
|
79 #include "utilities/events.hpp"
80 #include "utilities/macros.hpp"
81 #include "utilities/ostream.hpp"
82 #include "utilities/utf8.hpp"
83
84 #include <ctype.h>
85
86 // Entry point in java.dll for path canonicalization
87
88 typedef int (*canonicalize_fn_t)(const char *orig, char *out, int len);
89
90 static canonicalize_fn_t CanonicalizeEntry = nullptr;
91
92 // Entry points for jimage.dll for loading jimage file entries
93
94 static JImageOpen_t JImageOpen = nullptr;
95 static JImageClose_t JImageClose = nullptr;
96 static JImageFindResource_t JImageFindResource = nullptr;
97 static JImageGetResource_t JImageGetResource = nullptr;
98
99 // JImageFile pointer, or null if exploded JDK build.
100 static JImageFile* JImage_file = nullptr;
101
102 // PreviewMode status to control preview behaviour. JImage_file is unusable
103 // for normal lookup until (Preview_mode != PREVIEW_MODE_UNINITIALIZED).
104 enum PreviewMode {
105 PREVIEW_MODE_UNINITIALIZED = 0,
106 PREVIEW_MODE_DEFAULT = 1,
107 PREVIEW_MODE_ENABLE_PREVIEW = 2
108 };
109 static PreviewMode Preview_mode = PREVIEW_MODE_UNINITIALIZED;
110
111 // Globals
112
113 PerfCounter* ClassLoader::_perf_accumulated_time = nullptr;
114 PerfCounter* ClassLoader::_perf_classes_inited = nullptr;
115 PerfCounter* ClassLoader::_perf_class_init_time = nullptr;
116 PerfCounter* ClassLoader::_perf_class_init_selftime = nullptr;
117 PerfCounter* ClassLoader::_perf_classes_verified = nullptr;
118 PerfCounter* ClassLoader::_perf_class_verify_time = nullptr;
119 PerfCounter* ClassLoader::_perf_class_verify_selftime = nullptr;
120 PerfCounter* ClassLoader::_perf_classes_linked = nullptr;
121 PerfCounter* ClassLoader::_perf_class_link_time = nullptr;
122 PerfCounter* ClassLoader::_perf_class_link_selftime = nullptr;
123 PerfCounter* ClassLoader::_perf_shared_classload_time = nullptr;
124 PerfCounter* ClassLoader::_perf_sys_classload_time = nullptr;
125 PerfCounter* ClassLoader::_perf_app_classload_time = nullptr;
126 PerfCounter* ClassLoader::_perf_app_classload_selftime = nullptr;
127 PerfCounter* ClassLoader::_perf_app_classload_count = nullptr;
128 PerfCounter* ClassLoader::_perf_define_appclasses = nullptr;
129 PerfCounter* ClassLoader::_perf_define_appclass_time = nullptr;
130 PerfCounter* ClassLoader::_perf_define_appclass_selftime = nullptr;
146 PerfCounter* ClassLoader::_perf_resolve_indy_count = nullptr;
147 PerfCounter* ClassLoader::_perf_resolve_invokehandle_count = nullptr;
148 PerfCounter* ClassLoader::_perf_resolve_mh_count = nullptr;
149 PerfCounter* ClassLoader::_perf_resolve_mt_count = nullptr;
150
151 void ClassLoader::print_counters(outputStream *st) {
152 st->print_cr("ClassLoader:");
153 st->print_cr(" clinit: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", ClassLoader::class_init_time_ms(), ClassLoader::class_init_count());
154 st->print_cr(" link methods: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_ik_link_methods_time->get_value()) , _perf_ik_link_methods_count->get_value());
155 st->print_cr(" method adapters: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_method_adapters_time->get_value()) , _perf_method_adapters_count->get_value());
156 st->print_cr(" resolve...");
157 st->print_cr(" invokedynamic: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_resolve_indy_time->get_value()) , _perf_resolve_indy_count->get_value());
158 st->print_cr(" invokehandle: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_resolve_invokehandle_time->get_value()) , _perf_resolve_invokehandle_count->get_value());
159 st->print_cr(" CP_MethodHandle: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_resolve_mh_time->get_value()) , _perf_resolve_mh_count->get_value());
160 st->print_cr(" CP_MethodType: " JLONG_FORMAT "ms / " JLONG_FORMAT " events", Management::ticks_to_ms(_perf_resolve_mt_time->get_value()) , _perf_resolve_mt_count->get_value());
161 st->cr();
162 }
163
164 GrowableArray<ModuleClassPathList*>* ClassLoader::_patch_mod_entries = nullptr;
165 GrowableArray<ModuleClassPathList*>* ClassLoader::_exploded_entries = nullptr;
166 ClassPathImageEntry* ClassLoader::_jrt_entry = nullptr;
167
168 ClassPathEntry* volatile ClassLoader::_first_append_entry_list = nullptr;
169 ClassPathEntry* volatile ClassLoader::_last_append_entry = nullptr;
170
171 // helper routines
172 #if INCLUDE_CDS
173 static bool string_starts_with(const char* str, const char* str_to_find) {
174 size_t str_len = strlen(str);
175 size_t str_to_find_len = strlen(str_to_find);
176 if (str_to_find_len > str_len) {
177 return false;
178 }
179 return (strncmp(str, str_to_find, str_to_find_len) == 0);
180 }
181 #endif
182
183 bool ClassLoader::string_ends_with(const char* str, const char* str_to_find) {
184 size_t str_len = strlen(str);
185 size_t str_to_find_len = strlen(str_to_find);
186 if (str_to_find_len > str_len) {
187 return false;
188 }
189 return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
190 }
191
192 // Used to obtain the package name from a fully qualified class name.
193 Symbol* ClassLoader::package_from_class_name(const Symbol* name, bool* bad_class_name) {
194 if (name == nullptr) {
195 if (bad_class_name != nullptr) {
196 *bad_class_name = true;
197 }
198 return nullptr;
199 }
200
201 int utf_len = name->utf8_length();
202 const jbyte* base = (const jbyte*)name->base();
217 // In this situation, is_same_class_package returns false.
218 if (*start == JVM_SIGNATURE_CLASS) {
219 if (bad_class_name != nullptr) {
220 *bad_class_name = true;
221 }
222 return nullptr;
223 }
224 }
225 // A class name could have just the slash character in the name,
226 // in which case start > end
227 if (start >= end) {
228 // No package name
229 if (bad_class_name != nullptr) {
230 *bad_class_name = true;
231 }
232 return nullptr;
233 }
234 return SymbolTable::new_symbol(name, pointer_delta_as_int(start, base), pointer_delta_as_int(end, base));
235 }
236
237 // --------------------------------
238 // The following jimage_xxx static functions encapsulate all JImage_file and Preview_mode access.
239 // This is done to make it easy to reason about the JImage file state (exists vs initialized etc.).
240
241 // Opens the named JImage file and sets the JImage file reference.
242 // Returns true if opening the JImage file was successful (see also jimage_exists()).
243 static bool jimage_open(const char* modules_path) {
244 // Currently 'error' is not set to anything useful, so ignore it here.
245 jint error;
246 JImage_file = (*JImageOpen)(modules_path, &error);
247 return JImage_file != nullptr;
248 }
249
250 // Closes and clears the JImage file reference (this will only be called during shutdown).
251 static void jimage_close() {
252 if (JImage_file != nullptr) {
253 (*JImageClose)(JImage_file);
254 JImage_file = nullptr;
255 }
256 }
257
258 // Returns whether a JImage file was opened (but NOT whether it was initialized yet).
259 static bool jimage_exists() {
260 return JImage_file != nullptr;
261 }
262
263 // Returns the JImage file reference (which may or may not be initialized).
264 static JImageFile* jimage_non_null() {
265 assert(jimage_exists(), "should have been opened by ClassLoader::lookup_vm_options "
266 "and remained throughout normal JVM lifetime");
267 return JImage_file;
268 }
269
270 // Returns true if jimage_init() has been called. Once the JImage file is initialized,
271 // jimage_is_preview_enabled() can be called to correctly determine the access mode.
272 static bool jimage_is_initialized() {
273 return jimage_exists() && Preview_mode != PREVIEW_MODE_UNINITIALIZED;
274 }
275
276 // Returns the access mode for an initialized JImage file (reflects --enable-preview).
277 static bool is_preview_enabled() {
278 return Preview_mode == PREVIEW_MODE_ENABLE_PREVIEW;
279 }
280
281 // Looks up the location of a named JImage resource. This "raw" lookup function allows
282 // the preview mode to be manually specified, so must not be accessible outside this
283 // class. ClassPathImageEntry manages all calls for resources after startup is complete.
284 static JImageLocationRef jimage_find_resource(const char* module_name,
285 const char* file_name,
286 bool is_preview,
287 jlong *size) {
288 return ((*JImageFindResource)(jimage_non_null(),
289 module_name,
290 file_name,
291 is_preview,
292 size));
293 }
294 // --------------------------------
295
296 // Given a fully qualified package name, find its defining package in the class loader's
297 // package entry table.
298 PackageEntry* ClassLoader::get_package_entry(Symbol* pkg_name, ClassLoaderData* loader_data) {
299 if (pkg_name == nullptr) {
300 return nullptr;
301 }
302 PackageEntryTable* pkgEntryTable = loader_data->packages();
303 return pkgEntryTable->lookup_only(pkg_name);
304 }
305
306 const char* ClassPathEntry::copy_path(const char* path) {
307 char* copy = NEW_C_HEAP_ARRAY(char, strlen(path)+1, mtClass);
308 strcpy(copy, path);
309 return copy;
310 }
311
312 ClassPathDirEntry::~ClassPathDirEntry() {
313 FREE_C_HEAP_ARRAY(_dir);
314 }
315
414 return buffer;
415 }
416
417 ClassFileStream* ClassPathZipEntry::open_stream(JavaThread* current, const char* name) {
418 jint filesize;
419 u1* buffer = open_entry(current, name, &filesize, false);
420 if (buffer == nullptr) {
421 return nullptr;
422 }
423 if (UsePerfData) {
424 ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
425 }
426 // Resource allocated
427 return new ClassFileStream(buffer,
428 filesize,
429 _zip_name);
430 }
431
432 DEBUG_ONLY(ClassPathImageEntry* ClassPathImageEntry::_singleton = nullptr;)
433
434 void ClassPathImageEntry::close_jimage() {
435 jimage_close();
436 }
437
438 ClassPathImageEntry::ClassPathImageEntry(const char* name) :
439 ClassPathEntry() {
440 guarantee(jimage_is_initialized(), "jimage is not initialized");
441 guarantee(name != nullptr, "jimage file name is null");
442
443 assert(_singleton == nullptr, "VM supports only one jimage");
444 DEBUG_ONLY(_singleton = this);
445 size_t len = strlen(name) + 1;
446 _name = copy_path(name);
447 }
448
449 ClassFileStream* ClassPathImageEntry::open_stream(JavaThread* current, const char* name) {
450 return open_stream_for_loader(current, name, ClassLoaderData::the_null_class_loader_data());
451 }
452
453 // For a class in a named module, look it up in the jimage file using this syntax:
454 // /<module-name>/<package-name>/<base-class>
455 //
456 // Assumptions:
457 // 1. There are no unnamed modules in the jimage file.
458 // 2. A package is in at most one module in the jimage file.
459 //
460 ClassFileStream* ClassPathImageEntry::open_stream_for_loader(JavaThread* current, const char* name, ClassLoaderData* loader_data) {
461 const bool is_preview = is_preview_enabled();
462
463 jlong size;
464 JImageLocationRef location = 0;
465
466 TempNewSymbol class_name = SymbolTable::new_symbol(name);
467 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name);
468
469 if (pkg_name != nullptr) {
470 if (!Universe::is_module_initialized()) {
471 location = jimage_find_resource(JAVA_BASE_NAME, name, is_preview, &size);
472 } else {
473 PackageEntry* package_entry = ClassLoader::get_package_entry(pkg_name, loader_data);
474 if (package_entry != nullptr) {
475 ResourceMark rm(current);
476 // Get the module name
477 ModuleEntry* module = package_entry->module();
478 assert(module != nullptr, "Boot classLoader package missing module");
479 assert(module->is_named(), "Boot classLoader package is in unnamed module");
480 const char* module_name = module->name()->as_C_string();
481 if (module_name != nullptr) {
482 location = jimage_find_resource(module_name, name, is_preview, &size);
483 }
484 }
485 }
486 }
487
488 if (location != 0) {
489 if (UsePerfData) {
490 ClassLoader::perf_sys_classfile_bytes_read()->inc(size);
491 }
492 char* data = NEW_RESOURCE_ARRAY(char, size);
493 (*JImageGetResource)(jimage_non_null(), location, data, size);
494 // Resource allocated
495 assert(this == ClassLoader::get_jrt_entry(), "must be");
496 return new ClassFileStream((u1*)data,
497 checked_cast<int>(size),
498 _name,
499 true); // from_boot_loader_modules_image
500 }
501
502 return nullptr;
503 }
504
505 bool ClassPathImageEntry::is_modules_image() const {
506 assert(this == _singleton, "VM supports a single jimage");
507 assert(this == ClassLoader::get_jrt_entry(), "must be used for jrt entry");
508 return true;
509 }
510
511 ModuleClassPathList::ModuleClassPathList(Symbol* module_name) {
512 _module_name = module_name;
513 _module_first_entry = nullptr;
514 _module_last_entry = nullptr;
515 }
516
517 ModuleClassPathList::~ModuleClassPathList() {
518 // Clean out each ClassPathEntry on list
519 ClassPathEntry* e = _module_first_entry;
520 while (e != nullptr) {
521 ClassPathEntry* next_entry = e->next();
522 delete e;
523 e = next_entry;
524 }
525 }
526
527 void ModuleClassPathList::add_to_list(ClassPathEntry* new_entry) {
642 #if INCLUDE_CDS
643 if (CDSConfig::is_dumping_archive()) {
644 if (!Arguments::has_jimage()) {
645 vm_exit_during_initialization("CDS is not supported in exploded JDK build", nullptr);
646 }
647 }
648 #endif
649
650 while (cp_stream.has_next()) {
651 const char* path = cp_stream.get_next();
652
653 if (set_base_piece) {
654 // The first time through the bootstrap_search setup, it must be determined
655 // what the base or core piece of the boot loader search is. Either a java runtime
656 // image is present or this is an exploded module build situation.
657 assert(string_ends_with(path, MODULES_IMAGE_NAME) || string_ends_with(path, JAVA_BASE_NAME),
658 "Incorrect boot loader search path, no java runtime image or " JAVA_BASE_NAME " exploded build");
659 struct stat st;
660 if (os::stat(path, &st) == 0) {
661 // Directory found
662 if (jimage_exists()) {
663 assert(Arguments::has_jimage(), "sanity check");
664 const char* canonical_path = get_canonical_path(path, current);
665 assert(canonical_path != nullptr, "canonical_path issue");
666
667 // Hand over lifecycle control of the JImage file to the _jrt_entry singleton
668 // (see ClassPathImageEntry::close_jimage). The image must be initialized by now.
669 _jrt_entry = new ClassPathImageEntry(canonical_path);
670 assert(_jrt_entry != nullptr && _jrt_entry->is_modules_image(), "No java runtime image present");
671 } // else it's an exploded build.
672 } else {
673 // If path does not exist, exit
674 vm_exit_during_initialization("Unable to establish the boot loader search path", path);
675 }
676 set_base_piece = false;
677 } else {
678 // Every entry on the boot class path after the initial base piece,
679 // which is set by os::set_boot_path(), is considered an appended entry.
680 update_class_path_entry_list(current, path);
681 }
682 }
683 }
684
685 // Gets the exploded path for the named module. The memory for the path
686 // is allocated on the C heap if `c_heap` is true otherwise in the resource area.
687 static const char* get_exploded_module_path(const char* module_name, bool c_heap) {
688 const char *home = Arguments::get_java_home();
689 const char file_sep = os::file_separator()[0];
690 // 10 represents the length of "modules" (7) + 2 file separators + \0
691 size_t len = strlen(home) + strlen(module_name) + 10;
692 char *path = c_heap ? NEW_C_HEAP_ARRAY(char, len, mtModule) : NEW_RESOURCE_ARRAY(char, len);
693 jio_snprintf(path, len, "%s%cmodules%c%s", home, file_sep, file_sep, module_name);
694 return path;
695 }
696
697 // Gets a preview path for a given class path as a resource.
698 static const char* get_preview_path(const char* path) {
699 const char file_sep = os::file_separator()[0];
700 // 18 represents the length of "META-INF" (8) + "preview" (7) + 2 file separators + \0
701 size_t len = strlen(path) + 18;
702 char *preview_path = NEW_RESOURCE_ARRAY(char, len);
703 jio_snprintf(preview_path, len, "%s%cMETA-INF%cpreview", path, file_sep, file_sep);
704 return preview_path;
705 }
706
707 // During an exploded modules build, each module defined to the boot loader
708 // will be added to the ClassLoader::_exploded_entries array.
709 void ClassLoader::add_to_exploded_build_list(JavaThread* current, Symbol* module_sym) {
710 assert(!ClassLoader::has_jrt_entry(), "Exploded build not applicable");
711 assert(_exploded_entries != nullptr, "_exploded_entries was not initialized");
712
713 // Find the module's symbol
714 ResourceMark rm(current);
715 const char *module_name = module_sym->as_C_string();
716 const char *path = get_exploded_module_path(module_name, false);
717
718 struct stat st;
719 if (os::stat(path, &st) == 0) {
720 // Directory found
721 ClassPathEntry* new_entry = create_class_path_entry(current, path, &st);
722 // If the path specification is valid, enter it into this module's list.
723 // There is no need to check for duplicate modules in the exploded entry list,
724 // since no two modules with the same name can be defined to the boot loader.
725 // This is checked at module definition time in Modules::define_module.
726 if (new_entry != nullptr) {
727 ModuleClassPathList* module_cpl = new ModuleClassPathList(module_sym);
728 log_info(class, load)("path: %s", path);
729
730 // If we are in preview mode, attempt to add a preview entry *before* the
731 // new class path entry if a preview path exists.
732 if (is_preview_enabled()) {
733 const char* preview_path = get_preview_path(path);
734 if (os::stat(preview_path, &st) == 0) {
735 ClassPathEntry* preview_entry = create_class_path_entry(current, preview_path, &st);
736 if (preview_entry != nullptr) {
737 module_cpl->add_to_list(preview_entry);
738 log_info(class, load)("preview path: %s", preview_path);
739 }
740 }
741 }
742
743 module_cpl->add_to_list(new_entry);
744 {
745 MutexLocker ml(current, Module_lock);
746 _exploded_entries->push(module_cpl);
747 }
748 }
749 }
750 }
751
752 jzfile* ClassLoader::open_zip_file(const char* canonical_path, char** error_msg, JavaThread* thread) {
753 // enable call to C land
754 ThreadToNativeFromVM ttn(thread);
755 HandleMark hm(thread);
756 return ZipLibrary::open(canonical_path, error_msg);
757 }
758
759 ClassPathEntry* ClassLoader::create_class_path_entry(JavaThread* current,
760 const char *path, const struct stat* st) {
761 ClassPathEntry* new_entry = nullptr;
762 if ((st->st_mode & S_IFMT) == S_IFREG) {
763 ResourceMark rm(current);
764 // Regular file, should be a zip file
765 // Canonicalized filename
766 const char* canonical_path = get_canonical_path(path, current);
767 if (canonical_path == nullptr) {
966
967 // Return null if package does not exist or if no classes in that package
968 // have been loaded.
969 if (package != nullptr && package->has_loaded_class()) {
970 ModuleEntry* module = package->module();
971 if (module->location() != nullptr) {
972 ResourceMark rm(THREAD);
973 Handle ml = java_lang_String::create_from_str(
974 module->location()->as_C_string(), THREAD);
975 return ml();
976 }
977 // Return entry on boot loader class path.
978 Handle cph = java_lang_String::create_from_str(
979 ClassLoader::classpath_entry(package->classpath_index())->name(), THREAD);
980 return cph();
981 }
982 }
983 return nullptr;
984 }
985
986 refArrayOop ClassLoader::get_system_packages(TRAPS) {
987 ResourceMark rm(THREAD);
988 // List of pointers to PackageEntrys that have loaded classes.
989 PackageEntryTable* pe_table =
990 ClassLoaderData::the_null_class_loader_data()->packages();
991 GrowableArray<PackageEntry*>* loaded_class_pkgs = pe_table->get_system_packages();
992
993 // Allocate objArray and fill with java.lang.String
994 refArrayOop r = oopFactory::new_refArray(vmClasses::String_klass(),
995 loaded_class_pkgs->length(),
996 CHECK_NULL);
997 refArrayHandle result(THREAD, r);
998 for (int x = 0; x < loaded_class_pkgs->length(); x++) {
999 PackageEntry* package_entry = loaded_class_pkgs->at(x);
1000 Handle str = java_lang_String::create_from_symbol(package_entry->name(), CHECK_NULL);
1001 result->obj_at_put(x, str());
1002 }
1003 return result();
1004 }
1005
1006 // caller needs ResourceMark
1007 const char* ClassLoader::file_name_for_class_name(const char* class_name,
1008 int class_name_len) {
1009 assert(class_name != nullptr, "invariant");
1010 assert((int)strlen(class_name) == class_name_len, "invariant");
1011
1012 static const char class_suffix[] = ".class";
1013 size_t class_suffix_len = sizeof(class_suffix);
1014
1015 char* const file_name = NEW_RESOURCE_ARRAY(char,
1016 class_name_len +
1017 class_suffix_len); // includes term null
1094
1095 // Called by the boot classloader to load classes
1096 InstanceKlass* ClassLoader::load_class(Symbol* name, PackageEntry* pkg_entry, bool search_append_only, TRAPS) {
1097 assert(name != nullptr, "invariant");
1098
1099 ResourceMark rm(THREAD);
1100 HandleMark hm(THREAD);
1101
1102 const char* const class_name = name->as_C_string();
1103
1104 EventMarkClassLoading m("Loading class %s", class_name);
1105
1106 const char* const file_name = file_name_for_class_name(class_name,
1107 name->utf8_length());
1108 assert(file_name != nullptr, "invariant");
1109
1110 // Lookup stream for parsing .class file
1111 ClassFileStream* stream = nullptr;
1112 s2 classpath_index = 0;
1113 ClassPathEntry* e = nullptr;
1114 bool is_patched = false;
1115
1116 // If search_append_only is true, boot loader visibility boundaries are
1117 // set to be _first_append_entry to the end. This includes:
1118 // [-Xbootclasspath/a]; [jvmti appended entries]
1119 //
1120 // If search_append_only is false, boot loader visibility boundaries are
1121 // set to be the --patch-module entries plus the base piece. This includes:
1122 // [--patch-module=<module>=<file>(<pathsep><file>)*]; [jimage | exploded module build]
1123 //
1124
1125 // Load Attempt #1: --patch-module
1126 // Determine the class' defining module. If it appears in the _patch_mod_entries,
1127 // attempt to load the class from those locations specific to the module.
1128 // Specifications to --patch-module can contain a partial number of classes
1129 // that are part of the overall module definition. So if a particular class is not
1130 // found within its module specification, the search should continue to Load Attempt #2.
1131 // Note: The --patch-module entries are never searched if the boot loader's
1132 // visibility boundary is limited to only searching the append entries.
1133 if (_patch_mod_entries != nullptr && !search_append_only) {
1134 // At CDS dump time, the --patch-module entries are ignored. That means a
1135 // class is still loaded from the runtime image even if it might
1136 // appear in the _patch_mod_entries. The runtime shared class visibility
1137 // check will determine if a shared class is visible based on the runtime
1138 // environment, including the runtime --patch-module setting.
1139 if (!Arguments::is_valhalla_enabled()) {
1140 // Dynamic dumping requires UseSharedSpaces to be enabled. Since --patch-module
1141 // is not supported with UseSharedSpaces, we can never come here during dynamic dumping.
1142 assert(!CDSConfig::is_dumping_archive(), "CDS doesn't support --patch-module during dumping");
1143 }
1144 if (Arguments::is_valhalla_enabled() || !CDSConfig::is_dumping_static_archive()) {
1145 stream = search_module_entries(THREAD, _patch_mod_entries, pkg_entry, file_name);
1146 if (stream != nullptr) {
1147 is_patched = true;
1148 }
1149 }
1150 }
1151
1152 // Load Attempt #2: [jimage | exploded build]
1153 if (!search_append_only && (nullptr == stream)) {
1154 if (has_jrt_entry()) {
1155 e = _jrt_entry;
1156 stream = _jrt_entry->open_stream(THREAD, file_name);
1157 } else {
1158 // Exploded build - attempt to locate class in its defining module's location.
1159 assert(_exploded_entries != nullptr, "No exploded build entries present");
1160 assert(!CDSConfig::is_dumping_archive(), "CDS dumping doesn't support exploded build");
1161 stream = search_module_entries(THREAD, _exploded_entries, pkg_entry, file_name);
1162 }
1163 }
1164
1165 // Load Attempt #3: [-Xbootclasspath/a]; [jvmti appended entries]
1166 if (search_append_only && (nullptr == stream)) {
1167 // For the boot loader append path search, the starting classpath_index
1168 // for the appended piece is always 1 to account for either the
1169 // _jrt_entry or the _exploded_entries.
1178 }
1179 e = e->next();
1180 ++classpath_index;
1181 }
1182 }
1183
1184 if (nullptr == stream) {
1185 return nullptr;
1186 }
1187
1188 ClassLoaderData* loader_data = ClassLoaderData::the_null_class_loader_data();
1189 Handle protection_domain;
1190 ClassLoadInfo cl_info(protection_domain);
1191
1192 InstanceKlass* result = KlassFactory::create_from_stream(stream,
1193 name,
1194 loader_data,
1195 cl_info,
1196 CHECK_NULL);
1197 result->set_classpath_index(classpath_index);
1198 if (is_patched) {
1199 result->set_shared_classpath_index(0);
1200 }
1201 return result;
1202 }
1203
1204 #if INCLUDE_CDS
1205 static const char* skip_uri_protocol(const char* source) {
1206 if (strncmp(source, "file:", 5) == 0) {
1207 // file: protocol path could start with file:/ or file:///
1208 // locate the char after all the forward slashes
1209 int offset = 5;
1210 while (*(source + offset) == '/') {
1211 offset++;
1212 }
1213 source += offset;
1214 // for non-windows platforms, move back one char as the path begins with a '/'
1215 #ifndef _WINDOWS
1216 source -= 1;
1217 #endif
1218 } else if (strncmp(source, "jrt:/", 5) == 0) {
1219 source += 5;
1220 }
1257 for (size_t i = 0; i < strlen(uri); ++i) {
1258 char decoded = decode_percent_encoded(uri, i);
1259 path[path_index++] = decoded;
1260 }
1261 path[path_index] = '\0';
1262 return path;
1263 }
1264
1265 // Record the shared classpath index and loader type for classes loaded
1266 // by the builtin loaders at dump time.
1267 void ClassLoader::record_result(JavaThread* current, InstanceKlass* ik,
1268 const ClassFileStream* stream, bool redefined) {
1269 assert(CDSConfig::is_dumping_archive(), "sanity");
1270 assert(stream != nullptr, "sanity");
1271
1272 if (ik->is_hidden()) {
1273 record_hidden_class(ik);
1274 return;
1275 }
1276
1277 if (ik->shared_classpath_index() == 0 && ik->defined_by_boot_loader()) {
1278 return;
1279 }
1280
1281 oop loader = ik->class_loader();
1282 char* src = (char*)stream->source();
1283 if (src == nullptr) {
1284 ik->set_shared_classpath_index(-1); // unsupported location
1285 return;
1286 }
1287
1288 if (!SystemDictionaryShared::is_builtin_loader(ik->class_loader_data())) {
1289 // A class loaded by a user-defined classloader.
1290 assert(ik->shared_classpath_index() < 0, "not assigned yet");
1291 ik->set_shared_classpath_index(UNREGISTERED_INDEX);
1292 SystemDictionaryShared::set_shared_class_misc_info(ik, (ClassFileStream*)stream);
1293 return;
1294 }
1295
1296 assert(has_jrt_entry(), "CDS dumping does not support exploded JDK build");
1297
1298 ResourceMark rm(current);
1299 int classpath_index = -1;
1300 bool found_invalid = false;
1469 NEWPERFEVENTCOUNTER(_perf_method_adapters_count, SUN_CLS, "makeAdaptersCount");
1470
1471 NEWPERFTICKCOUNTER(_perf_resolve_indy_time, SUN_CLS, "resolve_invokedynamic_time");
1472 NEWPERFTICKCOUNTER(_perf_resolve_invokehandle_time, SUN_CLS, "resolve_invokehandle_time");
1473 NEWPERFTICKCOUNTER(_perf_resolve_mh_time, SUN_CLS, "resolve_MethodHandle_time");
1474 NEWPERFTICKCOUNTER(_perf_resolve_mt_time, SUN_CLS, "resolve_MethodType_time");
1475
1476 NEWPERFEVENTCOUNTER(_perf_resolve_indy_count, SUN_CLS, "resolve_invokedynamic_count");
1477 NEWPERFEVENTCOUNTER(_perf_resolve_invokehandle_count, SUN_CLS, "resolve_invokehandle_count");
1478 NEWPERFEVENTCOUNTER(_perf_resolve_mh_count, SUN_CLS, "resolve_MethodHandle_count");
1479 NEWPERFEVENTCOUNTER(_perf_resolve_mt_count, SUN_CLS, "resolve_MethodType_count");
1480 }
1481 }
1482
1483 // lookup java library entry points
1484 load_java_library();
1485 // jimage library entry points are loaded below, in lookup_vm_options
1486 setup_bootstrap_search_path(THREAD);
1487 }
1488
1489 // Lookup VM options embedded in the modules jimage file
1490 char* ClassLoader::lookup_vm_options() {
1491 char modules_path[JVM_MAXPATHLEN];
1492 const char* fileSep = os::file_separator();
1493
1494 // Initialize jimage library entry points
1495 load_jimage_library();
1496
1497 jio_snprintf(modules_path, JVM_MAXPATHLEN, "%s%slib%smodules", Arguments::get_java_home(), fileSep, fileSep);
1498 if (jimage_open(modules_path)) {
1499 // Special case where we lookup the options string *before* set_preview_mode() is called.
1500 // Since VM arguments have not been parsed, and the ClassPathImageEntry singleton
1501 // has not been created yet, we access the JImage file directly in non-preview mode.
1502 jlong size;
1503 JImageLocationRef location =
1504 jimage_find_resource(JAVA_BASE_NAME, "jdk/internal/vm/options", /* is_preview */ false, &size);
1505 if (location != 0) {
1506 char *options = NEW_C_HEAP_ARRAY(char, size+1, mtClass);
1507 (*JImageGetResource)(jimage_non_null(), location, options, size);
1508 options[size] = '\0';
1509 return options;
1510 }
1511 }
1512 return nullptr;
1513 }
1514
1515 // Finishes initializing the JImageFile (if present) by setting the access mode.
1516 void ClassLoader::set_preview_mode(bool enable_preview) {
1517 assert(Preview_mode == PREVIEW_MODE_UNINITIALIZED, "set_preview_mode must not be called twice");
1518 Preview_mode = enable_preview ? PREVIEW_MODE_ENABLE_PREVIEW : PREVIEW_MODE_DEFAULT;
1519 }
1520
1521 bool ClassLoader::is_module_observable(const char* module_name) {
1522 assert(JImageOpen != nullptr, "jimage library should have been opened");
1523 if (!jimage_exists()) {
1524 struct stat st;
1525 const char *path = get_exploded_module_path(module_name, true);
1526 bool res = os::stat(path, &st) == 0;
1527 FREE_C_HEAP_ARRAY(path);
1528 return res;
1529 }
1530 // We don't expect preview mode (i.e. --enable-preview) to affect module visibility.
1531 jlong size;
1532 return jimage_find_resource(module_name, "module-info.class", /* is_preview */ false, &size) != 0;
1533 }
1534
1535 jlong ClassLoader::classloader_time_ms() {
1536 return UsePerfData ?
1537 Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
1538 }
1539
1540 jlong ClassLoader::class_init_count() {
1541 return UsePerfData ? _perf_classes_inited->get_value() : -1;
1542 }
1543
1544 jlong ClassLoader::class_init_time_ms() {
1545 return UsePerfData ?
1546 Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
1547 }
1548
1549 jlong ClassLoader::class_verify_time_ms() {
1550 return UsePerfData ?
1551 Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
1552 }
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