47 #include "logging/logStream.hpp"
48 #include "memory/allocation.inline.hpp"
49 #include "memory/heapInspection.hpp"
50 #include "memory/iterator.inline.hpp"
51 #include "memory/metadataFactory.hpp"
52 #include "memory/metaspaceClosure.hpp"
53 #include "memory/metaspaceShared.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/resourceArea.hpp"
56 #include "memory/universe.hpp"
57 #include "oops/fieldStreams.hpp"
58 #include "oops/constantPool.hpp"
59 #include "oops/instanceClassLoaderKlass.hpp"
60 #include "oops/instanceKlass.inline.hpp"
61 #include "oops/instanceMirrorKlass.hpp"
62 #include "oops/instanceOop.hpp"
63 #include "oops/klass.inline.hpp"
64 #include "oops/method.hpp"
65 #include "oops/oop.inline.hpp"
66 #include "oops/symbol.hpp"
67 #include "prims/jvmtiExport.hpp"
68 #include "prims/jvmtiRedefineClasses.hpp"
69 #include "prims/jvmtiThreadState.hpp"
70 #include "prims/methodComparator.hpp"
71 #include "runtime/atomic.hpp"
72 #include "runtime/fieldDescriptor.inline.hpp"
73 #include "runtime/handles.inline.hpp"
74 #include "runtime/javaCalls.hpp"
75 #include "runtime/mutexLocker.hpp"
76 #include "runtime/orderAccess.hpp"
77 #include "runtime/thread.inline.hpp"
78 #include "services/classLoadingService.hpp"
79 #include "services/threadService.hpp"
80 #include "utilities/dtrace.hpp"
81 #include "utilities/events.hpp"
82 #include "utilities/macros.hpp"
83 #include "utilities/stringUtils.hpp"
84 #ifdef COMPILER1
85 #include "c1/c1_Compiler.hpp"
86 #endif
355
356 bool access = (cur_host == k_nest_host);
357
358 if (log_is_enabled(Trace, class, nestmates)) {
359 ResourceMark rm(THREAD);
360 log_trace(class, nestmates)("Class %s does %shave nestmate access to %s",
361 this->external_name(),
362 access ? "" : "NOT ",
363 k->external_name());
364 }
365
366 return access;
367 }
368
369 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) {
370 const int size = InstanceKlass::size(parser.vtable_size(),
371 parser.itable_size(),
372 nonstatic_oop_map_size(parser.total_oop_map_count()),
373 parser.is_interface(),
374 parser.is_unsafe_anonymous(),
375 should_store_fingerprint(parser.is_unsafe_anonymous()));
376
377 const Symbol* const class_name = parser.class_name();
378 assert(class_name != NULL, "invariant");
379 ClassLoaderData* loader_data = parser.loader_data();
380 assert(loader_data != NULL, "invariant");
381
382 InstanceKlass* ik;
383
384 // Allocation
385 if (REF_NONE == parser.reference_type()) {
386 if (class_name == vmSymbols::java_lang_Class()) {
387 // mirror
388 ik = new (loader_data, size, THREAD) InstanceMirrorKlass(parser);
389 }
390 else if (is_class_loader(class_name, parser)) {
391 // class loader
392 ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser);
393 } else {
394 // normal
395 ik = new (loader_data, size, THREAD) InstanceKlass(parser, InstanceKlass::_misc_kind_other);
396 }
397 } else {
398 // reference
399 ik = new (loader_data, size, THREAD) InstanceRefKlass(parser);
400 }
401
402 // Check for pending exception before adding to the loader data and incrementing
403 // class count. Can get OOM here.
404 if (HAS_PENDING_EXCEPTION) {
405 return NULL;
406 }
407
408 return ik;
409 }
410
411
412 // copy method ordering from resource area to Metaspace
413 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) {
414 if (m != NULL) {
415 // allocate a new array and copy contents (memcpy?)
416 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
417 for (int i = 0; i < m->length(); i++) {
418 _method_ordering->at_put(i, m->at(i));
419 }
420 } else {
421 _method_ordering = Universe::the_empty_int_array();
422 }
423 }
424
425 // create a new array of vtable_indices for default methods
426 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
427 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
428 assert(default_vtable_indices() == NULL, "only create once");
429 set_default_vtable_indices(vtable_indices);
430 return vtable_indices;
431 }
432
433 InstanceKlass::InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id) :
434 Klass(id),
435 _nest_members(NULL),
436 _nest_host_index(0),
437 _nest_host(NULL),
438 _static_field_size(parser.static_field_size()),
439 _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())),
440 _itable_len(parser.itable_size()),
441 _init_thread(NULL),
442 _init_state(allocated),
443 _reference_type(parser.reference_type())
444 {
445 set_vtable_length(parser.vtable_size());
446 set_kind(kind);
447 set_access_flags(parser.access_flags());
448 set_is_unsafe_anonymous(parser.is_unsafe_anonymous());
449 set_layout_helper(Klass::instance_layout_helper(parser.layout_size(),
450 false));
451
452 assert(NULL == _methods, "underlying memory not zeroed?");
453 assert(is_instance_klass(), "is layout incorrect?");
454 assert(size_helper() == parser.layout_size(), "incorrect size_helper?");
455
456 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
457 SystemDictionaryShared::init_dumptime_info(this);
458 }
459 }
460
461 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
462 Array<Method*>* methods) {
463 if (methods != NULL && methods != Universe::the_empty_method_array() &&
464 !methods->is_shared()) {
465 for (int i = 0; i < methods->length(); i++) {
466 Method* method = methods->at(i);
467 if (method == NULL) continue; // maybe null if error processing
468 // Only want to delete methods that are not executing for RedefineClasses.
469 // The previous version will point to them so they're not totally dangling
470 assert (!method->on_stack(), "shouldn't be called with methods on stack");
471 MetadataFactory::free_metadata(loader_data, method);
472 }
473 MetadataFactory::free_array<Method*>(loader_data, methods);
474 }
475 }
476
477 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
478 const Klass* super_klass,
776 vmSymbols::java_lang_IncompatibleClassChangeError(),
777 "class %s has interface %s as super class",
778 external_name(),
779 super_klass->external_name()
780 );
781 return false;
782 }
783
784 InstanceKlass* ik_super = InstanceKlass::cast(super_klass);
785 ik_super->link_class_impl(CHECK_false);
786 }
787
788 // link all interfaces implemented by this class before linking this class
789 Array<InstanceKlass*>* interfaces = local_interfaces();
790 int num_interfaces = interfaces->length();
791 for (int index = 0; index < num_interfaces; index++) {
792 InstanceKlass* interk = interfaces->at(index);
793 interk->link_class_impl(CHECK_false);
794 }
795
796 // in case the class is linked in the process of linking its superclasses
797 if (is_linked()) {
798 return true;
799 }
800
801 // trace only the link time for this klass that includes
802 // the verification time
803 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
804 ClassLoader::perf_class_link_selftime(),
805 ClassLoader::perf_classes_linked(),
806 jt->get_thread_stat()->perf_recursion_counts_addr(),
807 jt->get_thread_stat()->perf_timers_addr(),
808 PerfClassTraceTime::CLASS_LINK);
809
810 // verification & rewriting
811 {
812 HandleMark hm(THREAD);
813 Handle h_init_lock(THREAD, init_lock());
814 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
815 // rewritten will have been set if loader constraint error found
845 // Initialize the vtable and interface table after
846 // methods have been rewritten since rewrite may
847 // fabricate new Method*s.
848 // also does loader constraint checking
849 //
850 // initialize_vtable and initialize_itable need to be rerun for
851 // a shared class if the class is not loaded by the NULL classloader.
852 ClassLoaderData * loader_data = class_loader_data();
853 if (!(is_shared() &&
854 loader_data->is_the_null_class_loader_data())) {
855 vtable().initialize_vtable(true, CHECK_false);
856 itable().initialize_itable(true, CHECK_false);
857 }
858 #ifdef ASSERT
859 else {
860 vtable().verify(tty, true);
861 // In case itable verification is ever added.
862 // itable().verify(tty, true);
863 }
864 #endif
865 set_init_state(linked);
866 if (JvmtiExport::should_post_class_prepare()) {
867 Thread *thread = THREAD;
868 assert(thread->is_Java_thread(), "thread->is_Java_thread()");
869 JvmtiExport::post_class_prepare((JavaThread *) thread, this);
870 }
871 }
872 }
873 return true;
874 }
875
876 // Rewrite the byte codes of all of the methods of a class.
877 // The rewriter must be called exactly once. Rewriting must happen after
878 // verification but before the first method of the class is executed.
879 void InstanceKlass::rewrite_class(TRAPS) {
880 assert(is_loaded(), "must be loaded");
881 if (is_rewritten()) {
882 assert(is_shared(), "rewriting an unshared class?");
883 return;
884 }
998 // having a superinterface that declares, non-static, concrete methods
999 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) {
1000 initialize_super_interfaces(THREAD);
1001 }
1002
1003 // If any exceptions, complete abruptly, throwing the same exception as above.
1004 if (HAS_PENDING_EXCEPTION) {
1005 Handle e(THREAD, PENDING_EXCEPTION);
1006 CLEAR_PENDING_EXCEPTION;
1007 {
1008 EXCEPTION_MARK;
1009 // Locks object, set state, and notify all waiting threads
1010 set_initialization_state_and_notify(initialization_error, THREAD);
1011 CLEAR_PENDING_EXCEPTION;
1012 }
1013 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait);
1014 THROW_OOP(e());
1015 }
1016 }
1017
1018
1019 // Look for aot compiled methods for this klass, including class initializer.
1020 AOTLoader::load_for_klass(this, THREAD);
1021
1022 // Step 8
1023 {
1024 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
1025 // Timer includes any side effects of class initialization (resolution,
1026 // etc), but not recursive entry into call_class_initializer().
1027 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
1028 ClassLoader::perf_class_init_selftime(),
1029 ClassLoader::perf_classes_inited(),
1030 jt->get_thread_stat()->perf_recursion_counts_addr(),
1031 jt->get_thread_stat()->perf_timers_addr(),
1032 PerfClassTraceTime::CLASS_CLINIT);
1033 call_class_initializer(THREAD);
1034 }
1035
1036 // Step 9
1037 if (!HAS_PENDING_EXCEPTION) {
1038 set_initialization_state_and_notify(fully_initialized, CHECK);
1039 {
1040 debug_only(vtable().verify(tty, true);)
1041 }
1042 }
1043 else {
1044 // Step 10 and 11
1045 Handle e(THREAD, PENDING_EXCEPTION);
1046 CLEAR_PENDING_EXCEPTION;
1047 // JVMTI has already reported the pending exception
1048 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1049 JvmtiExport::clear_detected_exception(jt);
1050 {
1051 EXCEPTION_MARK;
1052 set_initialization_state_and_notify(initialization_error, THREAD);
1053 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below
1054 // JVMTI has already reported the pending exception
1055 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1056 JvmtiExport::clear_detected_exception(jt);
1057 }
1058 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
1059 if (e->is_a(SystemDictionary::Error_klass())) {
1060 THROW_OOP(e());
1061 } else {
1062 JavaCallArguments args(e);
1063 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
1064 vmSymbols::throwable_void_signature(),
1274 return i;
1275 }
1276
1277 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) {
1278 return instanceHandle(THREAD, allocate_instance(THREAD));
1279 }
1280
1281 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1282 if (is_interface() || is_abstract()) {
1283 ResourceMark rm(THREAD);
1284 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1285 : vmSymbols::java_lang_InstantiationException(), external_name());
1286 }
1287 if (this == SystemDictionary::Class_klass()) {
1288 ResourceMark rm(THREAD);
1289 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1290 : vmSymbols::java_lang_IllegalAccessException(), external_name());
1291 }
1292 }
1293
1294 Klass* InstanceKlass::array_klass_impl(bool or_null, int n, TRAPS) {
1295 // Need load-acquire for lock-free read
1296 if (array_klasses_acquire() == NULL) {
1297 if (or_null) return NULL;
1298
1299 ResourceMark rm;
1300 JavaThread *jt = (JavaThread *)THREAD;
1301 {
1302 // Atomic creation of array_klasses
1303 MutexLocker ma(MultiArray_lock, THREAD);
1304
1305 // Check if update has already taken place
1306 if (array_klasses() == NULL) {
1307 Klass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this, CHECK_NULL);
1308 // use 'release' to pair with lock-free load
1309 release_set_array_klasses(k);
1310 }
1311 }
1312 }
1313 // _this will always be set at this point
1314 ObjArrayKlass* oak = (ObjArrayKlass*)array_klasses();
1315 if (or_null) {
1316 return oak->array_klass_or_null(n);
1317 }
1318 return oak->array_klass(n, THREAD);
1319 }
1320
1321 Klass* InstanceKlass::array_klass_impl(bool or_null, TRAPS) {
1322 return array_klass_impl(or_null, 1, THREAD);
1323 }
1324
1325 static int call_class_initializer_counter = 0; // for debugging
1326
1327 Method* InstanceKlass::class_initializer() const {
1328 Method* clinit = find_method(
1329 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1330 if (clinit != NULL && clinit->has_valid_initializer_flags()) {
1331 return clinit;
1332 }
1333 return NULL;
1334 }
1335
1336 void InstanceKlass::call_class_initializer(TRAPS) {
1337 if (ReplayCompiles &&
1338 (ReplaySuppressInitializers == 1 ||
1339 (ReplaySuppressInitializers >= 2 && class_loader() != NULL))) {
1340 // Hide the existence of the initializer for the purpose of replaying the compile
1341 return;
1342 }
1343
1344 methodHandle h_method(THREAD, class_initializer());
1345 assert(!is_initialized(), "we cannot initialize twice");
1346 LogTarget(Info, class, init) lt;
1347 if (lt.is_enabled()) {
1348 ResourceMark rm;
1349 LogStream ls(lt);
1350 ls.print("%d Initializing ", call_class_initializer_counter++);
1351 name()->print_value_on(&ls);
1352 ls.print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", p2i(this));
1353 }
1354 if (h_method() != NULL) {
1355 JavaCallArguments args; // No arguments
1356 JavaValue result(T_VOID);
1357 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1358 }
1359 }
1360
1361
1362 void InstanceKlass::mask_for(const methodHandle& method, int bci,
1363 InterpreterOopMap* entry_for) {
1364 // Lazily create the _oop_map_cache at first request
1365 // Lock-free access requires load_acquire.
1366 OopMapCache* oop_map_cache = OrderAccess::load_acquire(&_oop_map_cache);
1367 if (oop_map_cache == NULL) {
1368 MutexLocker x(OopMapCacheAlloc_lock);
1369 // Check if _oop_map_cache was allocated while we were waiting for this lock
1370 if ((oop_map_cache = _oop_map_cache) == NULL) {
1371 oop_map_cache = new OopMapCache();
1372 // Ensure _oop_map_cache is stable, since it is examined without a lock
1373 OrderAccess::release_store(&_oop_map_cache, oop_map_cache);
1374 }
1375 }
1376 // _oop_map_cache is constant after init; lookup below does its own locking.
1377 oop_map_cache->lookup(method, bci, entry_for);
1378 }
1379
1380
1381 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1382 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1383 Symbol* f_name = fs.name();
1384 Symbol* f_sig = fs.signature();
1385 if (f_name == name && f_sig == sig) {
1386 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1387 return true;
1388 }
1527 if (!fd.is_static()) {
1528 fields_sorted[j + 0] = fd.offset();
1529 fields_sorted[j + 1] = i;
1530 j += 2;
1531 }
1532 }
1533 if (j > 0) {
1534 length = j;
1535 // _sort_Fn is defined in growableArray.hpp.
1536 qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset);
1537 for (int i = 0; i < length; i += 2) {
1538 fd.reinitialize(this, fields_sorted[i + 1]);
1539 assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields");
1540 cl->do_field(&fd);
1541 }
1542 }
1543 FREE_C_HEAP_ARRAY(int, fields_sorted);
1544 }
1545
1546
1547 void InstanceKlass::array_klasses_do(void f(Klass* k, TRAPS), TRAPS) {
1548 if (array_klasses() != NULL)
1549 ArrayKlass::cast(array_klasses())->array_klasses_do(f, THREAD);
1550 }
1551
1552 void InstanceKlass::array_klasses_do(void f(Klass* k)) {
1553 if (array_klasses() != NULL)
1554 ArrayKlass::cast(array_klasses())->array_klasses_do(f);
1555 }
1556
1557 #ifdef ASSERT
1558 static int linear_search(const Array<Method*>* methods,
1559 const Symbol* name,
1560 const Symbol* signature) {
1561 const int len = methods->length();
1562 for (int index = 0; index < len; index++) {
1563 const Method* const m = methods->at(index);
1564 assert(m->is_method(), "must be method");
1565 if (m->signature() == signature && m->name() == name) {
1566 return index;
1567 }
1568 }
1569 return -1;
1570 }
1571 #endif
1789 }
1790
1791 // uncached_lookup_method searches both the local class methods array and all
1792 // superclasses methods arrays, skipping any overpass methods in superclasses,
1793 // and possibly skipping private methods.
1794 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
1795 const Symbol* signature,
1796 OverpassLookupMode overpass_mode,
1797 PrivateLookupMode private_mode) const {
1798 OverpassLookupMode overpass_local_mode = overpass_mode;
1799 const Klass* klass = this;
1800 while (klass != NULL) {
1801 Method* const method = InstanceKlass::cast(klass)->find_method_impl(name,
1802 signature,
1803 overpass_local_mode,
1804 find_static,
1805 private_mode);
1806 if (method != NULL) {
1807 return method;
1808 }
1809 klass = klass->super();
1810 overpass_local_mode = skip_overpass; // Always ignore overpass methods in superclasses
1811 }
1812 return NULL;
1813 }
1814
1815 #ifdef ASSERT
1816 // search through class hierarchy and return true if this class or
1817 // one of the superclasses was redefined
1818 bool InstanceKlass::has_redefined_this_or_super() const {
1819 const Klass* klass = this;
1820 while (klass != NULL) {
1821 if (InstanceKlass::cast(klass)->has_been_redefined()) {
1822 return true;
1823 }
1824 klass = klass->super();
1825 }
1826 return false;
1827 }
1828 #endif
2529
2530 #if INCLUDE_JVMTI
2531 // Deallocate breakpoint records
2532 if (breakpoints() != 0x0) {
2533 methods_do(clear_all_breakpoints);
2534 assert(breakpoints() == 0x0, "should have cleared breakpoints");
2535 }
2536
2537 // deallocate the cached class file
2538 if (_cached_class_file != NULL) {
2539 os::free(_cached_class_file);
2540 _cached_class_file = NULL;
2541 }
2542 #endif
2543
2544 // Decrement symbol reference counts associated with the unloaded class.
2545 if (_name != NULL) _name->decrement_refcount();
2546 // unreference array name derived from this class name (arrays of an unloaded
2547 // class can't be referenced anymore).
2548 if (_array_name != NULL) _array_name->decrement_refcount();
2549 if (_source_debug_extension != NULL) FREE_C_HEAP_ARRAY(char, _source_debug_extension);
2550 }
2551
2552 void InstanceKlass::set_source_debug_extension(const char* array, int length) {
2553 if (array == NULL) {
2554 _source_debug_extension = NULL;
2555 } else {
2556 // Adding one to the attribute length in order to store a null terminator
2557 // character could cause an overflow because the attribute length is
2558 // already coded with an u4 in the classfile, but in practice, it's
2559 // unlikely to happen.
2560 assert((length+1) > length, "Overflow checking");
2561 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
2562 for (int i = 0; i < length; i++) {
2563 sde[i] = array[i];
2564 }
2565 sde[length] = '\0';
2566 _source_debug_extension = sde;
2567 }
2568 }
2569
2570 const char* InstanceKlass::signature_name() const {
2571 int hash_len = 0;
2572 char hash_buf[40];
2573
2574 // If this is an unsafe anonymous class, append a hash to make the name unique
2575 if (is_unsafe_anonymous()) {
2576 intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0;
2577 jio_snprintf(hash_buf, sizeof(hash_buf), "/" UINTX_FORMAT, (uintx)hash);
2578 hash_len = (int)strlen(hash_buf);
2579 }
2580
2581 // Get the internal name as a c string
2582 const char* src = (const char*) (name()->as_C_string());
2583 const int src_length = (int)strlen(src);
2584
2585 char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3);
2586
2587 // Add L as type indicator
2588 int dest_index = 0;
2589 dest[dest_index++] = 'L';
2590
2591 // Add the actual class name
2592 for (int src_index = 0; src_index < src_length; ) {
2593 dest[dest_index++] = src[src_index++];
2594 }
2595
2596 // If we have a hash, append it
2597 for (int hash_index = 0; hash_index < hash_len; ) {
2598 dest[dest_index++] = hash_buf[hash_index++];
2599 }
2600
2601 // Add the semicolon and the NULL
2602 dest[dest_index++] = ';';
2603 dest[dest_index] = '\0';
2604 return dest;
2605 }
2606
2607 // Used to obtain the package name from a fully qualified class name.
2608 Symbol* InstanceKlass::package_from_name(const Symbol* name, TRAPS) {
2609 if (name == NULL) {
3100 }
3101
3102 assert(match_level == false || best == NULL, "shouldn't pick up anything if match_level is set");
3103 if (best != NULL && best->comp_level() >= comp_level) {
3104 return best;
3105 }
3106 return NULL;
3107 }
3108
3109 // -----------------------------------------------------------------------------------------------------
3110 // Printing
3111
3112 #ifndef PRODUCT
3113
3114 #define BULLET " - "
3115
3116 static const char* state_names[] = {
3117 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
3118 };
3119
3120 static void print_vtable(intptr_t* start, int len, outputStream* st) {
3121 for (int i = 0; i < len; i++) {
3122 intptr_t e = start[i];
3123 st->print("%d : " INTPTR_FORMAT, i, e);
3124 if (MetaspaceObj::is_valid((Metadata*)e)) {
3125 st->print(" ");
3126 ((Metadata*)e)->print_value_on(st);
3127 }
3128 st->cr();
3129 }
3130 }
3131
3132 static void print_vtable(vtableEntry* start, int len, outputStream* st) {
3133 return print_vtable(reinterpret_cast<intptr_t*>(start), len, st);
3134 }
3135
3136 void InstanceKlass::print_on(outputStream* st) const {
3137 assert(is_klass(), "must be klass");
3138 Klass::print_on(st);
3139
3140 st->print(BULLET"instance size: %d", size_helper()); st->cr();
3141 st->print(BULLET"klass size: %d", size()); st->cr();
3142 st->print(BULLET"access: "); access_flags().print_on(st); st->cr();
3143 st->print(BULLET"state: "); st->print_cr("%s", state_names[_init_state]);
3144 st->print(BULLET"name: "); name()->print_value_on(st); st->cr();
3145 st->print(BULLET"super: "); Metadata::print_value_on_maybe_null(st, super()); st->cr();
3146 st->print(BULLET"sub: ");
3147 Klass* sub = subklass();
3148 int n;
3149 for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) {
3150 if (n < MaxSubklassPrintSize) {
3151 sub->print_value_on(st);
3152 st->print(" ");
3153 }
3154 }
3155 if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize);
3156 st->cr();
3157
3158 if (is_interface()) {
3159 st->print_cr(BULLET"nof implementors: %d", nof_implementors());
3160 if (nof_implementors() == 1) {
3161 st->print_cr(BULLET"implementor: ");
3162 st->print(" ");
3163 implementor()->print_value_on(st);
3164 st->cr();
3165 }
3166 }
3167
3168 st->print(BULLET"arrays: "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr();
3169 st->print(BULLET"methods: "); methods()->print_value_on(st); st->cr();
3170 if (Verbose || WizardMode) {
3171 Array<Method*>* method_array = methods();
3172 for (int i = 0; i < method_array->length(); i++) {
3173 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3174 }
3175 }
3176 st->print(BULLET"method ordering: "); method_ordering()->print_value_on(st); st->cr();
3177 st->print(BULLET"default_methods: "); default_methods()->print_value_on(st); st->cr();
3178 if (Verbose && default_methods() != NULL) {
3179 Array<Method*>* method_array = default_methods();
3180 for (int i = 0; i < method_array->length(); i++) {
3181 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3182 }
3183 }
3184 if (default_vtable_indices() != NULL) {
3185 st->print(BULLET"default vtable indices: "); default_vtable_indices()->print_value_on(st); st->cr();
3186 }
3187 st->print(BULLET"local interfaces: "); local_interfaces()->print_value_on(st); st->cr();
3188 st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr();
3189 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr();
3190 if (class_loader_data() != NULL) {
3191 st->print(BULLET"class loader data: ");
3192 class_loader_data()->print_value_on(st);
3193 st->cr();
3194 }
3195 st->print(BULLET"unsafe anonymous host class: "); Metadata::print_value_on_maybe_null(st, unsafe_anonymous_host()); st->cr();
3196 if (source_file_name() != NULL) {
3197 st->print(BULLET"source file: ");
3198 source_file_name()->print_value_on(st);
3199 st->cr();
3200 }
3201 if (source_debug_extension() != NULL) {
3202 st->print(BULLET"source debug extension: ");
3203 st->print("%s", source_debug_extension());
3204 st->cr();
3205 }
3206 st->print(BULLET"class annotations: "); class_annotations()->print_value_on(st); st->cr();
3207 st->print(BULLET"class type annotations: "); class_type_annotations()->print_value_on(st); st->cr();
3208 st->print(BULLET"field annotations: "); fields_annotations()->print_value_on(st); st->cr();
3221 if (have_pv) st->cr();
3222 }
3223
3224 if (generic_signature() != NULL) {
3225 st->print(BULLET"generic signature: ");
3226 generic_signature()->print_value_on(st);
3227 st->cr();
3228 }
3229 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr();
3230 st->print(BULLET"nest members: "); nest_members()->print_value_on(st); st->cr();
3231 if (java_mirror() != NULL) {
3232 st->print(BULLET"java mirror: ");
3233 java_mirror()->print_value_on(st);
3234 st->cr();
3235 } else {
3236 st->print_cr(BULLET"java mirror: NULL");
3237 }
3238 st->print(BULLET"vtable length %d (start addr: " INTPTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
3239 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st);
3240 st->print(BULLET"itable length %d (start addr: " INTPTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
3241 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_itable(), itable_length(), st);
3242 st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
3243 FieldPrinter print_static_field(st);
3244 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
3245 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
3246 FieldPrinter print_nonstatic_field(st);
3247 InstanceKlass* ik = const_cast<InstanceKlass*>(this);
3248 ik->do_nonstatic_fields(&print_nonstatic_field);
3249
3250 st->print(BULLET"non-static oop maps: ");
3251 OopMapBlock* map = start_of_nonstatic_oop_maps();
3252 OopMapBlock* end_map = map + nonstatic_oop_map_count();
3253 while (map < end_map) {
3254 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
3255 map++;
3256 }
3257 st->cr();
3258 }
3259
3260 #endif //PRODUCT
3261
4003 if (holder == NULL) {
4004 return NULL; // The version of klass is gone, no method is found
4005 }
4006 Method* method = holder->method_with_orig_idnum(idnum);
4007 return method;
4008 }
4009
4010 #if INCLUDE_JVMTI
4011 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() {
4012 return _cached_class_file;
4013 }
4014
4015 jint InstanceKlass::get_cached_class_file_len() {
4016 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
4017 }
4018
4019 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
4020 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
4021 }
4022 #endif
|
47 #include "logging/logStream.hpp"
48 #include "memory/allocation.inline.hpp"
49 #include "memory/heapInspection.hpp"
50 #include "memory/iterator.inline.hpp"
51 #include "memory/metadataFactory.hpp"
52 #include "memory/metaspaceClosure.hpp"
53 #include "memory/metaspaceShared.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/resourceArea.hpp"
56 #include "memory/universe.hpp"
57 #include "oops/fieldStreams.hpp"
58 #include "oops/constantPool.hpp"
59 #include "oops/instanceClassLoaderKlass.hpp"
60 #include "oops/instanceKlass.inline.hpp"
61 #include "oops/instanceMirrorKlass.hpp"
62 #include "oops/instanceOop.hpp"
63 #include "oops/klass.inline.hpp"
64 #include "oops/method.hpp"
65 #include "oops/oop.inline.hpp"
66 #include "oops/symbol.hpp"
67 #include "oops/valueKlass.hpp"
68 #include "prims/jvmtiExport.hpp"
69 #include "prims/jvmtiRedefineClasses.hpp"
70 #include "prims/jvmtiThreadState.hpp"
71 #include "prims/methodComparator.hpp"
72 #include "runtime/atomic.hpp"
73 #include "runtime/fieldDescriptor.inline.hpp"
74 #include "runtime/handles.inline.hpp"
75 #include "runtime/javaCalls.hpp"
76 #include "runtime/mutexLocker.hpp"
77 #include "runtime/orderAccess.hpp"
78 #include "runtime/thread.inline.hpp"
79 #include "services/classLoadingService.hpp"
80 #include "services/threadService.hpp"
81 #include "utilities/dtrace.hpp"
82 #include "utilities/events.hpp"
83 #include "utilities/macros.hpp"
84 #include "utilities/stringUtils.hpp"
85 #ifdef COMPILER1
86 #include "c1/c1_Compiler.hpp"
87 #endif
356
357 bool access = (cur_host == k_nest_host);
358
359 if (log_is_enabled(Trace, class, nestmates)) {
360 ResourceMark rm(THREAD);
361 log_trace(class, nestmates)("Class %s does %shave nestmate access to %s",
362 this->external_name(),
363 access ? "" : "NOT ",
364 k->external_name());
365 }
366
367 return access;
368 }
369
370 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) {
371 const int size = InstanceKlass::size(parser.vtable_size(),
372 parser.itable_size(),
373 nonstatic_oop_map_size(parser.total_oop_map_count()),
374 parser.is_interface(),
375 parser.is_unsafe_anonymous(),
376 should_store_fingerprint(parser.is_unsafe_anonymous()),
377 parser.has_flattenable_fields() ? parser.java_fields_count() : 0,
378 parser.is_value_type());
379
380 const Symbol* const class_name = parser.class_name();
381 assert(class_name != NULL, "invariant");
382 ClassLoaderData* loader_data = parser.loader_data();
383 assert(loader_data != NULL, "invariant");
384
385 InstanceKlass* ik;
386
387 // Allocation
388 if (REF_NONE == parser.reference_type()) {
389 if (class_name == vmSymbols::java_lang_Class()) {
390 // mirror
391 ik = new (loader_data, size, THREAD) InstanceMirrorKlass(parser);
392 } else if (is_class_loader(class_name, parser)) {
393 // class loader
394 ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser);
395 } else if (parser.is_value_type()) {
396 // value type
397 ik = new (loader_data, size, THREAD) ValueKlass(parser);
398 } else {
399 // normal
400 ik = new (loader_data, size, THREAD) InstanceKlass(parser, InstanceKlass::_misc_kind_other);
401 }
402 } else {
403 // reference
404 ik = new (loader_data, size, THREAD) InstanceRefKlass(parser);
405 }
406
407 // Check for pending exception before adding to the loader data and incrementing
408 // class count. Can get OOM here.
409 if (HAS_PENDING_EXCEPTION) {
410 return NULL;
411 }
412
413 #ifdef ASSERT
414 assert(ik->size() == size, "");
415 ik->bounds_check((address) ik->start_of_vtable(), false, size);
416 ik->bounds_check((address) ik->start_of_itable(), false, size);
417 ik->bounds_check((address) ik->end_of_itable(), true, size);
418 ik->bounds_check((address) ik->end_of_nonstatic_oop_maps(), true, size);
419 #endif //ASSERT
420 return ik;
421 }
422
423 #ifndef PRODUCT
424 bool InstanceKlass::bounds_check(address addr, bool edge_ok, intptr_t size_in_bytes) const {
425 const char* bad = NULL;
426 address end = NULL;
427 if (addr < (address)this) {
428 bad = "before";
429 } else if (addr == (address)this) {
430 if (edge_ok) return true;
431 bad = "just before";
432 } else if (addr == (end = (address)this + sizeof(intptr_t) * (size_in_bytes < 0 ? size() : size_in_bytes))) {
433 if (edge_ok) return true;
434 bad = "just after";
435 } else if (addr > end) {
436 bad = "after";
437 } else {
438 return true;
439 }
440 tty->print_cr("%s object bounds: " INTPTR_FORMAT " [" INTPTR_FORMAT ".." INTPTR_FORMAT "]",
441 bad, (intptr_t)addr, (intptr_t)this, (intptr_t)end);
442 Verbose = WizardMode = true; this->print(); //@@
443 return false;
444 }
445 #endif //PRODUCT
446
447 // copy method ordering from resource area to Metaspace
448 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) {
449 if (m != NULL) {
450 // allocate a new array and copy contents (memcpy?)
451 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
452 for (int i = 0; i < m->length(); i++) {
453 _method_ordering->at_put(i, m->at(i));
454 }
455 } else {
456 _method_ordering = Universe::the_empty_int_array();
457 }
458 }
459
460 // create a new array of vtable_indices for default methods
461 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
462 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
463 assert(default_vtable_indices() == NULL, "only create once");
464 set_default_vtable_indices(vtable_indices);
465 return vtable_indices;
466 }
467
468 InstanceKlass::InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id) :
469 Klass(id),
470 _nest_members(NULL),
471 _nest_host_index(0),
472 _nest_host(NULL),
473 _static_field_size(parser.static_field_size()),
474 _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())),
475 _itable_len(parser.itable_size()),
476 _extra_flags(0),
477 _init_thread(NULL),
478 _init_state(allocated),
479 _reference_type(parser.reference_type()),
480 _adr_valueklass_fixed_block(NULL)
481 {
482 set_vtable_length(parser.vtable_size());
483 set_kind(kind);
484 set_access_flags(parser.access_flags());
485 set_is_unsafe_anonymous(parser.is_unsafe_anonymous());
486 set_layout_helper(Klass::instance_layout_helper(parser.layout_size(),
487 false));
488 if (parser.has_flattenable_fields()) {
489 set_has_value_fields();
490 }
491 _java_fields_count = parser.java_fields_count();
492
493 assert(NULL == _methods, "underlying memory not zeroed?");
494 assert(is_instance_klass(), "is layout incorrect?");
495 assert(size_helper() == parser.layout_size(), "incorrect size_helper?");
496
497 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
498 SystemDictionaryShared::init_dumptime_info(this);
499 }
500 }
501
502 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
503 Array<Method*>* methods) {
504 if (methods != NULL && methods != Universe::the_empty_method_array() &&
505 !methods->is_shared()) {
506 for (int i = 0; i < methods->length(); i++) {
507 Method* method = methods->at(i);
508 if (method == NULL) continue; // maybe null if error processing
509 // Only want to delete methods that are not executing for RedefineClasses.
510 // The previous version will point to them so they're not totally dangling
511 assert (!method->on_stack(), "shouldn't be called with methods on stack");
512 MetadataFactory::free_metadata(loader_data, method);
513 }
514 MetadataFactory::free_array<Method*>(loader_data, methods);
515 }
516 }
517
518 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
519 const Klass* super_klass,
817 vmSymbols::java_lang_IncompatibleClassChangeError(),
818 "class %s has interface %s as super class",
819 external_name(),
820 super_klass->external_name()
821 );
822 return false;
823 }
824
825 InstanceKlass* ik_super = InstanceKlass::cast(super_klass);
826 ik_super->link_class_impl(CHECK_false);
827 }
828
829 // link all interfaces implemented by this class before linking this class
830 Array<InstanceKlass*>* interfaces = local_interfaces();
831 int num_interfaces = interfaces->length();
832 for (int index = 0; index < num_interfaces; index++) {
833 InstanceKlass* interk = interfaces->at(index);
834 interk->link_class_impl(CHECK_false);
835 }
836
837
838 // If a class declares a method that uses a value class as an argument
839 // type or return value type, this value class must be loaded during the
840 // linking of this class because size and properties of the value class
841 // must be known in order to be able to perform value type optimizations.
842 // The implementation below is an approximation of this rule, the code
843 // iterates over all methods of the current class (including overridden
844 // methods), not only the methods declared by this class. This
845 // approximation makes the code simpler, and doesn't change the semantic
846 // because classes declaring methods overridden by the current class are
847 // linked (and have performed their own pre-loading) before the linking
848 // of the current class.
849 // This is also the moment to detect potential mismatch between the
850 // ValueTypes attribute and the kind of the class effectively loaded.
851
852
853 // Note:
854 // Value class types used for flattenable fields are loaded during
855 // the loading phase (see ClassFileParser::post_process_parsed_stream()).
856 // Value class types used as element types for array creation
857 // are not pre-loaded. Their loading is triggered by either anewarray
858 // or multianewarray bytecodes.
859
860 // Could it be possible to do the following processing only if the
861 // class uses value types?
862 {
863 ResourceMark rm(THREAD);
864 for (int i = 0; i < methods()->length(); i++) {
865 Method* m = methods()->at(i);
866 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
867 Symbol* sig = ss.as_symbol();
868 if (ss.is_object()) {
869 Symbol* symb = sig;
870 if (ss.is_array()) {
871 int i=0;
872 while (sig->char_at(i) == '[') i++;
873 if (i == sig->utf8_length() - 1 ) continue; // primitive array
874 symb = SymbolTable::new_symbol(sig->as_C_string() + i + 1,
875 sig->utf8_length() - 3);
876 }
877 if (ss.type() == T_VALUETYPE) {
878 oop loader = class_loader();
879 oop protection_domain = this->protection_domain();
880 Klass* klass = SystemDictionary::resolve_or_fail(symb,
881 Handle(THREAD, loader), Handle(THREAD, protection_domain), true,
882 CHECK_false);
883 if (symb != sig) {
884 symb->decrement_refcount();
885 }
886 if (klass == NULL) {
887 THROW_(vmSymbols::java_lang_LinkageError(), false);
888 }
889 if (!klass->is_value()) {
890 THROW_(vmSymbols::java_lang_IncompatibleClassChangeError(), false);
891 }
892 }
893 }
894 }
895 }
896 }
897
898 // in case the class is linked in the process of linking its superclasses
899 if (is_linked()) {
900 return true;
901 }
902
903 // trace only the link time for this klass that includes
904 // the verification time
905 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
906 ClassLoader::perf_class_link_selftime(),
907 ClassLoader::perf_classes_linked(),
908 jt->get_thread_stat()->perf_recursion_counts_addr(),
909 jt->get_thread_stat()->perf_timers_addr(),
910 PerfClassTraceTime::CLASS_LINK);
911
912 // verification & rewriting
913 {
914 HandleMark hm(THREAD);
915 Handle h_init_lock(THREAD, init_lock());
916 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
917 // rewritten will have been set if loader constraint error found
947 // Initialize the vtable and interface table after
948 // methods have been rewritten since rewrite may
949 // fabricate new Method*s.
950 // also does loader constraint checking
951 //
952 // initialize_vtable and initialize_itable need to be rerun for
953 // a shared class if the class is not loaded by the NULL classloader.
954 ClassLoaderData * loader_data = class_loader_data();
955 if (!(is_shared() &&
956 loader_data->is_the_null_class_loader_data())) {
957 vtable().initialize_vtable(true, CHECK_false);
958 itable().initialize_itable(true, CHECK_false);
959 }
960 #ifdef ASSERT
961 else {
962 vtable().verify(tty, true);
963 // In case itable verification is ever added.
964 // itable().verify(tty, true);
965 }
966 #endif
967
968 set_init_state(linked);
969 if (JvmtiExport::should_post_class_prepare()) {
970 Thread *thread = THREAD;
971 assert(thread->is_Java_thread(), "thread->is_Java_thread()");
972 JvmtiExport::post_class_prepare((JavaThread *) thread, this);
973 }
974 }
975 }
976 return true;
977 }
978
979 // Rewrite the byte codes of all of the methods of a class.
980 // The rewriter must be called exactly once. Rewriting must happen after
981 // verification but before the first method of the class is executed.
982 void InstanceKlass::rewrite_class(TRAPS) {
983 assert(is_loaded(), "must be loaded");
984 if (is_rewritten()) {
985 assert(is_shared(), "rewriting an unshared class?");
986 return;
987 }
1101 // having a superinterface that declares, non-static, concrete methods
1102 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) {
1103 initialize_super_interfaces(THREAD);
1104 }
1105
1106 // If any exceptions, complete abruptly, throwing the same exception as above.
1107 if (HAS_PENDING_EXCEPTION) {
1108 Handle e(THREAD, PENDING_EXCEPTION);
1109 CLEAR_PENDING_EXCEPTION;
1110 {
1111 EXCEPTION_MARK;
1112 // Locks object, set state, and notify all waiting threads
1113 set_initialization_state_and_notify(initialization_error, THREAD);
1114 CLEAR_PENDING_EXCEPTION;
1115 }
1116 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait);
1117 THROW_OOP(e());
1118 }
1119 }
1120
1121 // Step 8
1122 // Initialize classes of flattenable fields
1123 {
1124 for (AllFieldStream fs(this); !fs.done(); fs.next()) {
1125 if (fs.is_flattenable()) {
1126 Klass* klass = this->get_value_field_klass_or_null(fs.index());
1127 if (klass == NULL) {
1128 assert(fs.access_flags().is_static() && fs.access_flags().is_flattenable(),
1129 "Otherwise should have been pre-loaded");
1130 klass = SystemDictionary::resolve_or_fail(field_signature(fs.index())->fundamental_name(THREAD),
1131 Handle(THREAD, class_loader()),
1132 Handle(THREAD, protection_domain()),
1133 true, CHECK);
1134 if (klass == NULL) {
1135 THROW(vmSymbols::java_lang_NoClassDefFoundError());
1136 }
1137 if (!klass->is_value()) {
1138 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
1139 }
1140 this->set_value_field_klass(fs.index(), klass);
1141 }
1142 InstanceKlass::cast(klass)->initialize(CHECK);
1143 if (fs.access_flags().is_static()) {
1144 java_mirror()->obj_field_put(fs.offset(), ValueKlass::cast(klass)->default_value());
1145 }
1146 }
1147 }
1148 }
1149
1150
1151 // Look for aot compiled methods for this klass, including class initializer.
1152 AOTLoader::load_for_klass(this, THREAD);
1153
1154 // Step 9
1155 {
1156 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
1157 // Timer includes any side effects of class initialization (resolution,
1158 // etc), but not recursive entry into call_class_initializer().
1159 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
1160 ClassLoader::perf_class_init_selftime(),
1161 ClassLoader::perf_classes_inited(),
1162 jt->get_thread_stat()->perf_recursion_counts_addr(),
1163 jt->get_thread_stat()->perf_timers_addr(),
1164 PerfClassTraceTime::CLASS_CLINIT);
1165 call_class_initializer(THREAD);
1166 }
1167
1168 // Step 10
1169 if (!HAS_PENDING_EXCEPTION) {
1170 set_initialization_state_and_notify(fully_initialized, CHECK);
1171 {
1172 debug_only(vtable().verify(tty, true);)
1173 }
1174 }
1175 else {
1176 // Step 11 and 12
1177 Handle e(THREAD, PENDING_EXCEPTION);
1178 CLEAR_PENDING_EXCEPTION;
1179 // JVMTI has already reported the pending exception
1180 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1181 JvmtiExport::clear_detected_exception(jt);
1182 {
1183 EXCEPTION_MARK;
1184 set_initialization_state_and_notify(initialization_error, THREAD);
1185 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below
1186 // JVMTI has already reported the pending exception
1187 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1188 JvmtiExport::clear_detected_exception(jt);
1189 }
1190 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
1191 if (e->is_a(SystemDictionary::Error_klass())) {
1192 THROW_OOP(e());
1193 } else {
1194 JavaCallArguments args(e);
1195 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
1196 vmSymbols::throwable_void_signature(),
1406 return i;
1407 }
1408
1409 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) {
1410 return instanceHandle(THREAD, allocate_instance(THREAD));
1411 }
1412
1413 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1414 if (is_interface() || is_abstract()) {
1415 ResourceMark rm(THREAD);
1416 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1417 : vmSymbols::java_lang_InstantiationException(), external_name());
1418 }
1419 if (this == SystemDictionary::Class_klass()) {
1420 ResourceMark rm(THREAD);
1421 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1422 : vmSymbols::java_lang_IllegalAccessException(), external_name());
1423 }
1424 }
1425
1426 Klass* InstanceKlass::array_klass_impl(ArrayStorageProperties storage_props, bool or_null, int n, TRAPS) {
1427 assert(storage_props.is_empty(), "Unexpected");
1428 // Need load-acquire for lock-free read
1429 if (array_klasses_acquire() == NULL) {
1430 if (or_null) return NULL;
1431
1432 ResourceMark rm;
1433 {
1434 // Atomic creation of array_klasses
1435 MutexLocker ma(MultiArray_lock, THREAD);
1436
1437 // Check if update has already taken place
1438 if (array_klasses() == NULL) {
1439 Klass* k = ObjArrayKlass::allocate_objArray_klass(storage_props, 1, this, CHECK_NULL);
1440 // use 'release' to pair with lock-free load
1441 release_set_array_klasses(k);
1442 }
1443 }
1444 }
1445 // _this will always be set at this point
1446 ObjArrayKlass* oak = (ObjArrayKlass*)array_klasses();
1447 if (or_null) {
1448 return oak->array_klass_or_null(storage_props, n);
1449 }
1450 return oak->array_klass(storage_props, n, THREAD);
1451 }
1452
1453 Klass* InstanceKlass::array_klass_impl(ArrayStorageProperties storage_props, bool or_null, TRAPS) {
1454 return array_klass_impl(storage_props, or_null, 1, THREAD);
1455 }
1456
1457 static int call_class_initializer_counter = 0; // for debugging
1458
1459 Method* InstanceKlass::class_initializer() const {
1460 Method* clinit = find_method(
1461 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1462 if (clinit != NULL && clinit->is_class_initializer()) {
1463 return clinit;
1464 }
1465 return NULL;
1466 }
1467
1468 void InstanceKlass::call_class_initializer(TRAPS) {
1469 if (ReplayCompiles &&
1470 (ReplaySuppressInitializers == 1 ||
1471 (ReplaySuppressInitializers >= 2 && class_loader() != NULL))) {
1472 // Hide the existence of the initializer for the purpose of replaying the compile
1473 return;
1474 }
1475
1476 methodHandle h_method(THREAD, class_initializer());
1477 assert(!is_initialized(), "we cannot initialize twice");
1478 LogTarget(Info, class, init) lt;
1479 if (lt.is_enabled()) {
1480 ResourceMark rm;
1481 LogStream ls(lt);
1482 ls.print("%d Initializing ", call_class_initializer_counter++);
1483 name()->print_value_on(&ls);
1484 ls.print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", p2i(this));
1485 }
1486 if (h_method() != NULL) {
1487 JavaCallArguments args; // No arguments
1488 JavaValue result(T_VOID);
1489 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1490 }
1491 }
1492
1493
1494 void InstanceKlass::mask_for(const methodHandle& method, int bci,
1495 InterpreterOopMap* entry_for) {
1496 // Lazily create the _oop_map_cache at first request
1497 // Lock-free access requires load_acquire.
1498 OopMapCache* oop_map_cache = OrderAccess::load_acquire(&_oop_map_cache);
1499 if (oop_map_cache == NULL) {
1500 MutexLocker x(OopMapCacheAlloc_lock, Mutex::_no_safepoint_check_flag);
1501 // Check if _oop_map_cache was allocated while we were waiting for this lock
1502 if ((oop_map_cache = _oop_map_cache) == NULL) {
1503 oop_map_cache = new OopMapCache();
1504 // Ensure _oop_map_cache is stable, since it is examined without a lock
1505 OrderAccess::release_store(&_oop_map_cache, oop_map_cache);
1506 }
1507 }
1508 // _oop_map_cache is constant after init; lookup below does its own locking.
1509 oop_map_cache->lookup(method, bci, entry_for);
1510 }
1511
1512
1513 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1514 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1515 Symbol* f_name = fs.name();
1516 Symbol* f_sig = fs.signature();
1517 if (f_name == name && f_sig == sig) {
1518 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1519 return true;
1520 }
1659 if (!fd.is_static()) {
1660 fields_sorted[j + 0] = fd.offset();
1661 fields_sorted[j + 1] = i;
1662 j += 2;
1663 }
1664 }
1665 if (j > 0) {
1666 length = j;
1667 // _sort_Fn is defined in growableArray.hpp.
1668 qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset);
1669 for (int i = 0; i < length; i += 2) {
1670 fd.reinitialize(this, fields_sorted[i + 1]);
1671 assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields");
1672 cl->do_field(&fd);
1673 }
1674 }
1675 FREE_C_HEAP_ARRAY(int, fields_sorted);
1676 }
1677
1678
1679 void InstanceKlass::array_klasses_do(void f(Klass* k)) {
1680 if (array_klasses() != NULL)
1681 ArrayKlass::cast(array_klasses())->array_klasses_do(f);
1682 }
1683
1684 #ifdef ASSERT
1685 static int linear_search(const Array<Method*>* methods,
1686 const Symbol* name,
1687 const Symbol* signature) {
1688 const int len = methods->length();
1689 for (int index = 0; index < len; index++) {
1690 const Method* const m = methods->at(index);
1691 assert(m->is_method(), "must be method");
1692 if (m->signature() == signature && m->name() == name) {
1693 return index;
1694 }
1695 }
1696 return -1;
1697 }
1698 #endif
1916 }
1917
1918 // uncached_lookup_method searches both the local class methods array and all
1919 // superclasses methods arrays, skipping any overpass methods in superclasses,
1920 // and possibly skipping private methods.
1921 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
1922 const Symbol* signature,
1923 OverpassLookupMode overpass_mode,
1924 PrivateLookupMode private_mode) const {
1925 OverpassLookupMode overpass_local_mode = overpass_mode;
1926 const Klass* klass = this;
1927 while (klass != NULL) {
1928 Method* const method = InstanceKlass::cast(klass)->find_method_impl(name,
1929 signature,
1930 overpass_local_mode,
1931 find_static,
1932 private_mode);
1933 if (method != NULL) {
1934 return method;
1935 }
1936 if (name == vmSymbols::object_initializer_name()) {
1937 break; // <init> is never inherited, not even as a static factory
1938 }
1939 klass = klass->super();
1940 overpass_local_mode = skip_overpass; // Always ignore overpass methods in superclasses
1941 }
1942 return NULL;
1943 }
1944
1945 #ifdef ASSERT
1946 // search through class hierarchy and return true if this class or
1947 // one of the superclasses was redefined
1948 bool InstanceKlass::has_redefined_this_or_super() const {
1949 const Klass* klass = this;
1950 while (klass != NULL) {
1951 if (InstanceKlass::cast(klass)->has_been_redefined()) {
1952 return true;
1953 }
1954 klass = klass->super();
1955 }
1956 return false;
1957 }
1958 #endif
2659
2660 #if INCLUDE_JVMTI
2661 // Deallocate breakpoint records
2662 if (breakpoints() != 0x0) {
2663 methods_do(clear_all_breakpoints);
2664 assert(breakpoints() == 0x0, "should have cleared breakpoints");
2665 }
2666
2667 // deallocate the cached class file
2668 if (_cached_class_file != NULL) {
2669 os::free(_cached_class_file);
2670 _cached_class_file = NULL;
2671 }
2672 #endif
2673
2674 // Decrement symbol reference counts associated with the unloaded class.
2675 if (_name != NULL) _name->decrement_refcount();
2676 // unreference array name derived from this class name (arrays of an unloaded
2677 // class can't be referenced anymore).
2678 if (_array_name != NULL) _array_name->decrement_refcount();
2679 if (_value_types != NULL) {
2680 for (int i = 0; i < _value_types->length(); i++) {
2681 Symbol* s = _value_types->at(i)._class_name;
2682 if (s != NULL) {
2683 s->decrement_refcount();
2684 }
2685 }
2686 }
2687 if (_source_debug_extension != NULL) FREE_C_HEAP_ARRAY(char, _source_debug_extension);
2688 }
2689
2690 void InstanceKlass::set_source_debug_extension(const char* array, int length) {
2691 if (array == NULL) {
2692 _source_debug_extension = NULL;
2693 } else {
2694 // Adding one to the attribute length in order to store a null terminator
2695 // character could cause an overflow because the attribute length is
2696 // already coded with an u4 in the classfile, but in practice, it's
2697 // unlikely to happen.
2698 assert((length+1) > length, "Overflow checking");
2699 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
2700 for (int i = 0; i < length; i++) {
2701 sde[i] = array[i];
2702 }
2703 sde[length] = '\0';
2704 _source_debug_extension = sde;
2705 }
2706 }
2707
2708 const char* InstanceKlass::signature_name() const {
2709 return signature_name_of(is_value() ? 'Q' : 'L');
2710 }
2711
2712 const char* InstanceKlass::signature_name_of(char c) const {
2713 int hash_len = 0;
2714 char hash_buf[40];
2715
2716 // If this is an unsafe anonymous class, append a hash to make the name unique
2717 if (is_unsafe_anonymous()) {
2718 intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0;
2719 jio_snprintf(hash_buf, sizeof(hash_buf), "/" UINTX_FORMAT, (uintx)hash);
2720 hash_len = (int)strlen(hash_buf);
2721 }
2722
2723 // Get the internal name as a c string
2724 const char* src = (const char*) (name()->as_C_string());
2725 const int src_length = (int)strlen(src);
2726
2727 char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3);
2728
2729 // Add L or Q as type indicator
2730 int dest_index = 0;
2731 dest[dest_index++] = c;
2732
2733 // Add the actual class name
2734 for (int src_index = 0; src_index < src_length; ) {
2735 dest[dest_index++] = src[src_index++];
2736 }
2737
2738 // If we have a hash, append it
2739 for (int hash_index = 0; hash_index < hash_len; ) {
2740 dest[dest_index++] = hash_buf[hash_index++];
2741 }
2742
2743 // Add the semicolon and the NULL
2744 dest[dest_index++] = ';';
2745 dest[dest_index] = '\0';
2746 return dest;
2747 }
2748
2749 // Used to obtain the package name from a fully qualified class name.
2750 Symbol* InstanceKlass::package_from_name(const Symbol* name, TRAPS) {
2751 if (name == NULL) {
3242 }
3243
3244 assert(match_level == false || best == NULL, "shouldn't pick up anything if match_level is set");
3245 if (best != NULL && best->comp_level() >= comp_level) {
3246 return best;
3247 }
3248 return NULL;
3249 }
3250
3251 // -----------------------------------------------------------------------------------------------------
3252 // Printing
3253
3254 #ifndef PRODUCT
3255
3256 #define BULLET " - "
3257
3258 static const char* state_names[] = {
3259 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
3260 };
3261
3262 static void print_vtable(address self, intptr_t* start, int len, outputStream* st) {
3263 ResourceMark rm;
3264 int* forward_refs = NEW_RESOURCE_ARRAY(int, len);
3265 for (int i = 0; i < len; i++) forward_refs[i] = 0;
3266 for (int i = 0; i < len; i++) {
3267 intptr_t e = start[i];
3268 st->print("%d : " INTPTR_FORMAT, i, e);
3269 if (forward_refs[i] != 0) {
3270 int from = forward_refs[i];
3271 int off = (int) start[from];
3272 st->print(" (offset %d <= [%d])", off, from);
3273 }
3274 if (MetaspaceObj::is_valid((Metadata*)e)) {
3275 st->print(" ");
3276 ((Metadata*)e)->print_value_on(st);
3277 } else if (self != NULL && e > 0 && e < 0x10000) {
3278 address location = self + e;
3279 int index = (int)((intptr_t*)location - start);
3280 st->print(" (offset %d => [%d])", (int)e, index);
3281 if (index >= 0 && index < len)
3282 forward_refs[index] = i;
3283 }
3284 st->cr();
3285 }
3286 }
3287
3288 static void print_vtable(vtableEntry* start, int len, outputStream* st) {
3289 return print_vtable(NULL, reinterpret_cast<intptr_t*>(start), len, st);
3290 }
3291
3292 template<typename T>
3293 static void print_array_on(outputStream* st, Array<T>* array) {
3294 if (array == NULL) { st->print_cr("NULL"); return; }
3295 array->print_value_on(st); st->cr();
3296 if (Verbose || WizardMode) {
3297 for (int i = 0; i < array->length(); i++) {
3298 st->print("%d : ", i); array->at(i)->print_value_on(st); st->cr();
3299 }
3300 }
3301 }
3302
3303 static void print_array_on(outputStream* st, Array<int>* array) {
3304 if (array == NULL) { st->print_cr("NULL"); return; }
3305 array->print_value_on(st); st->cr();
3306 if (Verbose || WizardMode) {
3307 for (int i = 0; i < array->length(); i++) {
3308 st->print("%d : %d", i, array->at(i)); st->cr();
3309 }
3310 }
3311 }
3312
3313 void InstanceKlass::print_on(outputStream* st) const {
3314 assert(is_klass(), "must be klass");
3315 Klass::print_on(st);
3316
3317 st->print(BULLET"instance size: %d", size_helper()); st->cr();
3318 st->print(BULLET"klass size: %d", size()); st->cr();
3319 st->print(BULLET"access: "); access_flags().print_on(st); st->cr();
3320 st->print(BULLET"misc flags: 0x%x", _misc_flags); st->cr();
3321 st->print(BULLET"state: "); st->print_cr("%s", state_names[_init_state]);
3322 st->print(BULLET"name: "); name()->print_value_on(st); st->cr();
3323 st->print(BULLET"super: "); Metadata::print_value_on_maybe_null(st, super()); st->cr();
3324 st->print(BULLET"sub: ");
3325 Klass* sub = subklass();
3326 int n;
3327 for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) {
3328 if (n < MaxSubklassPrintSize) {
3329 sub->print_value_on(st);
3330 st->print(" ");
3331 }
3332 }
3333 if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize);
3334 st->cr();
3335
3336 if (is_interface()) {
3337 st->print_cr(BULLET"nof implementors: %d", nof_implementors());
3338 if (nof_implementors() == 1) {
3339 st->print_cr(BULLET"implementor: ");
3340 st->print(" ");
3341 implementor()->print_value_on(st);
3342 st->cr();
3343 }
3344 }
3345
3346 st->print(BULLET"arrays: "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr();
3347 st->print(BULLET"methods: "); print_array_on(st, methods());
3348 st->print(BULLET"method ordering: "); print_array_on(st, method_ordering());
3349 st->print(BULLET"default_methods: "); print_array_on(st, default_methods());
3350 if (default_vtable_indices() != NULL) {
3351 st->print(BULLET"default vtable indices: "); print_array_on(st, default_vtable_indices());
3352 }
3353 st->print(BULLET"local interfaces: "); print_array_on(st, local_interfaces());
3354 st->print(BULLET"trans. interfaces: "); print_array_on(st, transitive_interfaces());
3355 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr();
3356 if (class_loader_data() != NULL) {
3357 st->print(BULLET"class loader data: ");
3358 class_loader_data()->print_value_on(st);
3359 st->cr();
3360 }
3361 st->print(BULLET"unsafe anonymous host class: "); Metadata::print_value_on_maybe_null(st, unsafe_anonymous_host()); st->cr();
3362 if (source_file_name() != NULL) {
3363 st->print(BULLET"source file: ");
3364 source_file_name()->print_value_on(st);
3365 st->cr();
3366 }
3367 if (source_debug_extension() != NULL) {
3368 st->print(BULLET"source debug extension: ");
3369 st->print("%s", source_debug_extension());
3370 st->cr();
3371 }
3372 st->print(BULLET"class annotations: "); class_annotations()->print_value_on(st); st->cr();
3373 st->print(BULLET"class type annotations: "); class_type_annotations()->print_value_on(st); st->cr();
3374 st->print(BULLET"field annotations: "); fields_annotations()->print_value_on(st); st->cr();
3387 if (have_pv) st->cr();
3388 }
3389
3390 if (generic_signature() != NULL) {
3391 st->print(BULLET"generic signature: ");
3392 generic_signature()->print_value_on(st);
3393 st->cr();
3394 }
3395 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr();
3396 st->print(BULLET"nest members: "); nest_members()->print_value_on(st); st->cr();
3397 if (java_mirror() != NULL) {
3398 st->print(BULLET"java mirror: ");
3399 java_mirror()->print_value_on(st);
3400 st->cr();
3401 } else {
3402 st->print_cr(BULLET"java mirror: NULL");
3403 }
3404 st->print(BULLET"vtable length %d (start addr: " INTPTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
3405 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st);
3406 st->print(BULLET"itable length %d (start addr: " INTPTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
3407 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(NULL, start_of_itable(), itable_length(), st);
3408 st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
3409 FieldPrinter print_static_field(st);
3410 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
3411 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
3412 FieldPrinter print_nonstatic_field(st);
3413 InstanceKlass* ik = const_cast<InstanceKlass*>(this);
3414 ik->do_nonstatic_fields(&print_nonstatic_field);
3415
3416 st->print(BULLET"non-static oop maps: ");
3417 OopMapBlock* map = start_of_nonstatic_oop_maps();
3418 OopMapBlock* end_map = map + nonstatic_oop_map_count();
3419 while (map < end_map) {
3420 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
3421 map++;
3422 }
3423 st->cr();
3424 }
3425
3426 #endif //PRODUCT
3427
4169 if (holder == NULL) {
4170 return NULL; // The version of klass is gone, no method is found
4171 }
4172 Method* method = holder->method_with_orig_idnum(idnum);
4173 return method;
4174 }
4175
4176 #if INCLUDE_JVMTI
4177 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() {
4178 return _cached_class_file;
4179 }
4180
4181 jint InstanceKlass::get_cached_class_file_len() {
4182 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
4183 }
4184
4185 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
4186 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
4187 }
4188 #endif
4189
4190 #define THROW_DVT_ERROR(s) \
4191 Exceptions::fthrow(THREAD_AND_LOCATION, vmSymbols::java_lang_IncompatibleClassChangeError(), \
4192 "ValueCapableClass class '%s' %s", external_name(),(s)); \
4193 return
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