1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotClassInitializer.hpp"
26 #include "cds/aotMetaspace.hpp"
27 #include "cds/archiveUtils.hpp"
28 #include "cds/cdsConfig.hpp"
29 #include "cds/cdsEnumKlass.hpp"
30 #include "cds/classListWriter.hpp"
31 #include "cds/heapShared.hpp"
32 #include "classfile/classFileParser.hpp"
33 #include "classfile/classFileStream.hpp"
34 #include "classfile/classLoader.hpp"
35 #include "classfile/classLoaderData.inline.hpp"
36 #include "classfile/javaClasses.hpp"
37 #include "classfile/moduleEntry.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/systemDictionaryShared.hpp"
40 #include "classfile/verifier.hpp"
41 #include "classfile/vmClasses.hpp"
42 #include "classfile/vmSymbols.hpp"
43 #include "code/codeCache.hpp"
44 #include "code/dependencyContext.hpp"
45 #include "compiler/compilationPolicy.hpp"
46 #include "compiler/compileBroker.hpp"
47 #include "gc/shared/collectedHeap.inline.hpp"
48 #include "interpreter/bytecodeHistogram.hpp"
49 #include "interpreter/bytecodeStream.hpp"
50 #include "interpreter/oopMapCache.hpp"
51 #include "interpreter/rewriter.hpp"
52 #include "jvm.h"
53 #include "jvmtifiles/jvmti.h"
54 #include "klass.inline.hpp"
55 #include "logging/log.hpp"
56 #include "logging/logMessage.hpp"
57 #include "logging/logStream.hpp"
58 #include "memory/allocation.inline.hpp"
59 #include "memory/iterator.inline.hpp"
60 #include "memory/metadataFactory.hpp"
61 #include "memory/metaspaceClosure.hpp"
62 #include "memory/oopFactory.hpp"
63 #include "memory/resourceArea.hpp"
64 #include "memory/universe.hpp"
65 #include "oops/constantPool.hpp"
66 #include "oops/fieldStreams.inline.hpp"
67 #include "oops/instanceClassLoaderKlass.hpp"
68 #include "oops/instanceKlass.inline.hpp"
69 #include "oops/instanceMirrorKlass.hpp"
70 #include "oops/instanceOop.hpp"
71 #include "oops/instanceStackChunkKlass.hpp"
72 #include "oops/klass.inline.hpp"
73 #include "oops/method.hpp"
74 #include "oops/oop.inline.hpp"
75 #include "oops/recordComponent.hpp"
76 #include "oops/symbol.hpp"
77 #include "prims/jvmtiExport.hpp"
78 #include "prims/jvmtiRedefineClasses.hpp"
79 #include "prims/jvmtiThreadState.hpp"
80 #include "prims/methodComparator.hpp"
81 #include "runtime/arguments.hpp"
82 #include "runtime/atomic.hpp"
83 #include "runtime/deoptimization.hpp"
84 #include "runtime/fieldDescriptor.inline.hpp"
85 #include "runtime/handles.inline.hpp"
86 #include "runtime/javaCalls.hpp"
87 #include "runtime/javaThread.inline.hpp"
88 #include "runtime/mutexLocker.hpp"
89 #include "runtime/orderAccess.hpp"
90 #include "runtime/os.inline.hpp"
91 #include "runtime/reflection.hpp"
92 #include "runtime/runtimeUpcalls.hpp"
93 #include "runtime/synchronizer.hpp"
94 #include "runtime/threads.hpp"
95 #include "services/classLoadingService.hpp"
96 #include "services/finalizerService.hpp"
97 #include "services/threadService.hpp"
98 #include "utilities/dtrace.hpp"
99 #include "utilities/events.hpp"
100 #include "utilities/macros.hpp"
101 #include "utilities/nativeStackPrinter.hpp"
102 #include "utilities/stringUtils.hpp"
103 #ifdef COMPILER1
104 #include "c1/c1_Compiler.hpp"
105 #endif
106 #if INCLUDE_JFR
107 #include "jfr/jfrEvents.hpp"
108 #endif
109
110 #ifdef DTRACE_ENABLED
111
112
113 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED
114 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE
115 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT
116 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS
117 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED
118 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT
119 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR
120 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END
121 #define DTRACE_CLASSINIT_PROBE(type, thread_type) \
122 { \
123 char* data = nullptr; \
124 int len = 0; \
125 Symbol* clss_name = name(); \
126 if (clss_name != nullptr) { \
127 data = (char*)clss_name->bytes(); \
128 len = clss_name->utf8_length(); \
129 } \
130 HOTSPOT_CLASS_INITIALIZATION_##type( \
131 data, len, (void*)class_loader(), thread_type); \
132 }
133
134 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) \
135 { \
136 char* data = nullptr; \
137 int len = 0; \
138 Symbol* clss_name = name(); \
139 if (clss_name != nullptr) { \
140 data = (char*)clss_name->bytes(); \
141 len = clss_name->utf8_length(); \
142 } \
143 HOTSPOT_CLASS_INITIALIZATION_##type( \
144 data, len, (void*)class_loader(), thread_type, wait); \
145 }
146
147 #else // ndef DTRACE_ENABLED
148
149 #define DTRACE_CLASSINIT_PROBE(type, thread_type)
150 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait)
151
152 #endif // ndef DTRACE_ENABLED
153
154 bool InstanceKlass::_finalization_enabled = true;
155
156 static inline bool is_class_loader(const Symbol* class_name,
157 const ClassFileParser& parser) {
158 assert(class_name != nullptr, "invariant");
159
160 if (class_name == vmSymbols::java_lang_ClassLoader()) {
161 return true;
162 }
163
164 if (vmClasses::ClassLoader_klass_loaded()) {
165 const Klass* const super_klass = parser.super_klass();
166 if (super_klass != nullptr) {
167 if (super_klass->is_subtype_of(vmClasses::ClassLoader_klass())) {
168 return true;
169 }
170 }
171 }
172 return false;
173 }
174
175 static inline bool is_stack_chunk_class(const Symbol* class_name,
176 const ClassLoaderData* loader_data) {
177 return (class_name == vmSymbols::jdk_internal_vm_StackChunk() &&
178 loader_data->is_the_null_class_loader_data());
179 }
180
181 // private: called to verify that k is a static member of this nest.
182 // We know that k is an instance class in the same package and hence the
183 // same classloader.
184 bool InstanceKlass::has_nest_member(JavaThread* current, InstanceKlass* k) const {
185 assert(!is_hidden(), "unexpected hidden class");
186 if (_nest_members == nullptr || _nest_members == Universe::the_empty_short_array()) {
187 if (log_is_enabled(Trace, class, nestmates)) {
188 ResourceMark rm(current);
189 log_trace(class, nestmates)("Checked nest membership of %s in non-nest-host class %s",
190 k->external_name(), this->external_name());
191 }
192 return false;
193 }
194
195 if (log_is_enabled(Trace, class, nestmates)) {
196 ResourceMark rm(current);
197 log_trace(class, nestmates)("Checking nest membership of %s in %s",
198 k->external_name(), this->external_name());
199 }
200
201 // Check for the named class in _nest_members.
202 // We don't resolve, or load, any classes.
203 for (int i = 0; i < _nest_members->length(); i++) {
204 int cp_index = _nest_members->at(i);
205 Symbol* name = _constants->klass_name_at(cp_index);
206 if (name == k->name()) {
207 log_trace(class, nestmates)("- named class found at nest_members[%d] => cp[%d]", i, cp_index);
208 return true;
209 }
210 }
211 log_trace(class, nestmates)("- class is NOT a nest member!");
212 return false;
213 }
214
215 // Called to verify that k is a permitted subclass of this class.
216 // The incoming stringStream is used to format the messages for error logging and for the caller
217 // to use for exception throwing.
218 bool InstanceKlass::has_as_permitted_subclass(const InstanceKlass* k, stringStream& ss) const {
219 Thread* current = Thread::current();
220 assert(k != nullptr, "sanity check");
221 assert(_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array(),
222 "unexpected empty _permitted_subclasses array");
223
224 if (log_is_enabled(Trace, class, sealed)) {
225 ResourceMark rm(current);
226 log_trace(class, sealed)("Checking for permitted subclass %s in %s",
227 k->external_name(), this->external_name());
228 }
229
230 // Check that the class and its super are in the same module.
231 if (k->module() != this->module()) {
232 ss.print("Failed same module check: subclass %s is in module '%s' with loader %s, "
233 "and sealed class %s is in module '%s' with loader %s",
234 k->external_name(),
235 k->module()->name_as_C_string(),
236 k->module()->loader_data()->loader_name_and_id(),
237 this->external_name(),
238 this->module()->name_as_C_string(),
239 this->module()->loader_data()->loader_name_and_id());
240 log_trace(class, sealed)(" - %s", ss.as_string());
241 return false;
242 }
243
244 if (!k->is_public() && !is_same_class_package(k)) {
245 ss.print("Failed same package check: non-public subclass %s is in package '%s' with classloader %s, "
246 "and sealed class %s is in package '%s' with classloader %s",
247 k->external_name(),
248 k->package() != nullptr ? k->package()->name()->as_C_string() : "unnamed",
249 k->module()->loader_data()->loader_name_and_id(),
250 this->external_name(),
251 this->package() != nullptr ? this->package()->name()->as_C_string() : "unnamed",
252 this->module()->loader_data()->loader_name_and_id());
253 log_trace(class, sealed)(" - %s", ss.as_string());
254 return false;
255 }
256
257 for (int i = 0; i < _permitted_subclasses->length(); i++) {
258 int cp_index = _permitted_subclasses->at(i);
259 Symbol* name = _constants->klass_name_at(cp_index);
260 if (name == k->name()) {
261 log_trace(class, sealed)("- Found it at permitted_subclasses[%d] => cp[%d]", i, cp_index);
262 return true;
263 }
264 }
265
266 ss.print("Failed listed permitted subclass check: class %s is not a permitted subclass of %s",
267 k->external_name(), this->external_name());
268 log_trace(class, sealed)(" - %s", ss.as_string());
269 return false;
270 }
271
272 // Return nest-host class, resolving, validating and saving it if needed.
273 // In cases where this is called from a thread that cannot do classloading
274 // (such as a native JIT thread) then we simply return null, which in turn
275 // causes the access check to return false. Such code will retry the access
276 // from a more suitable environment later. Otherwise the _nest_host is always
277 // set once this method returns.
278 // Any errors from nest-host resolution must be preserved so they can be queried
279 // from higher-level access checking code, and reported as part of access checking
280 // exceptions.
281 // VirtualMachineErrors are propagated with a null return.
282 // Under any conditions where the _nest_host can be set to non-null the resulting
283 // value of it and, if applicable, the nest host resolution/validation error,
284 // are idempotent.
285 InstanceKlass* InstanceKlass::nest_host(TRAPS) {
286 InstanceKlass* nest_host_k = _nest_host;
287 if (nest_host_k != nullptr) {
288 return nest_host_k;
289 }
290
291 ResourceMark rm(THREAD);
292
293 // need to resolve and save our nest-host class.
294 if (_nest_host_index != 0) { // we have a real nest_host
295 // Before trying to resolve check if we're in a suitable context
296 bool can_resolve = THREAD->can_call_java();
297 if (!can_resolve && !_constants->tag_at(_nest_host_index).is_klass()) {
298 log_trace(class, nestmates)("Rejected resolution of nest-host of %s in unsuitable thread",
299 this->external_name());
300 return nullptr; // sentinel to say "try again from a different context"
301 }
302
303 log_trace(class, nestmates)("Resolving nest-host of %s using cp entry for %s",
304 this->external_name(),
305 _constants->klass_name_at(_nest_host_index)->as_C_string());
306
307 Klass* k = _constants->klass_at(_nest_host_index, THREAD);
308 if (HAS_PENDING_EXCEPTION) {
309 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
310 return nullptr; // propagate VMEs
311 }
312 stringStream ss;
313 char* target_host_class = _constants->klass_name_at(_nest_host_index)->as_C_string();
314 ss.print("Nest host resolution of %s with host %s failed: ",
315 this->external_name(), target_host_class);
316 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
317 const char* msg = ss.as_string(true /* on C-heap */);
318 constantPoolHandle cph(THREAD, constants());
319 SystemDictionary::add_nest_host_error(cph, _nest_host_index, msg);
320 CLEAR_PENDING_EXCEPTION;
321
322 log_trace(class, nestmates)("%s", msg);
323 } else {
324 // A valid nest-host is an instance class in the current package that lists this
325 // class as a nest member. If any of these conditions are not met the class is
326 // its own nest-host.
327 const char* error = nullptr;
328
329 // JVMS 5.4.4 indicates package check comes first
330 if (is_same_class_package(k)) {
331 // Now check actual membership. We can't be a member if our "host" is
332 // not an instance class.
333 if (k->is_instance_klass()) {
334 nest_host_k = InstanceKlass::cast(k);
335 bool is_member = nest_host_k->has_nest_member(THREAD, this);
336 if (is_member) {
337 _nest_host = nest_host_k; // save resolved nest-host value
338
339 log_trace(class, nestmates)("Resolved nest-host of %s to %s",
340 this->external_name(), k->external_name());
341 return nest_host_k;
342 } else {
343 error = "current type is not listed as a nest member";
344 }
345 } else {
346 error = "host is not an instance class";
347 }
348 } else {
349 error = "types are in different packages";
350 }
351
352 // something went wrong, so record what and log it
353 {
354 stringStream ss;
355 ss.print("Type %s (loader: %s) is not a nest member of type %s (loader: %s): %s",
356 this->external_name(),
357 this->class_loader_data()->loader_name_and_id(),
358 k->external_name(),
359 k->class_loader_data()->loader_name_and_id(),
360 error);
361 const char* msg = ss.as_string(true /* on C-heap */);
362 constantPoolHandle cph(THREAD, constants());
363 SystemDictionary::add_nest_host_error(cph, _nest_host_index, msg);
364 log_trace(class, nestmates)("%s", msg);
365 }
366 }
367 } else {
368 log_trace(class, nestmates)("Type %s is not part of a nest: setting nest-host to self",
369 this->external_name());
370 }
371
372 // Either not in an explicit nest, or else an error occurred, so
373 // the nest-host is set to `this`. Any thread that sees this assignment
374 // will also see any setting of nest_host_error(), if applicable.
375 return (_nest_host = this);
376 }
377
378 // Dynamic nest member support: set this class's nest host to the given class.
379 // This occurs as part of the class definition, as soon as the instanceKlass
380 // has been created and doesn't require further resolution. The code:
381 // lookup().defineHiddenClass(bytes_for_X, NESTMATE);
382 // results in:
383 // class_of_X.set_nest_host(lookup().lookupClass().getNestHost())
384 // If it has an explicit _nest_host_index or _nest_members, these will be ignored.
385 // We also know the "host" is a valid nest-host in the same package so we can
386 // assert some of those facts.
387 void InstanceKlass::set_nest_host(InstanceKlass* host) {
388 assert(is_hidden(), "must be a hidden class");
389 assert(host != nullptr, "null nest host specified");
390 assert(_nest_host == nullptr, "current class has resolved nest-host");
391 assert(nest_host_error() == nullptr, "unexpected nest host resolution error exists: %s",
392 nest_host_error());
393 assert((host->_nest_host == nullptr && host->_nest_host_index == 0) ||
394 (host->_nest_host == host), "proposed host is not a valid nest-host");
395 // Can't assert this as package is not set yet:
396 // assert(is_same_class_package(host), "proposed host is in wrong package");
397
398 if (log_is_enabled(Trace, class, nestmates)) {
399 ResourceMark rm;
400 const char* msg = "";
401 // a hidden class does not expect a statically defined nest-host
402 if (_nest_host_index > 0) {
403 msg = "(the NestHost attribute in the current class is ignored)";
404 } else if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
405 msg = "(the NestMembers attribute in the current class is ignored)";
406 }
407 log_trace(class, nestmates)("Injected type %s into the nest of %s %s",
408 this->external_name(),
409 host->external_name(),
410 msg);
411 }
412 // set dynamic nest host
413 _nest_host = host;
414 // Record dependency to keep nest host from being unloaded before this class.
415 ClassLoaderData* this_key = class_loader_data();
416 assert(this_key != nullptr, "sanity");
417 this_key->record_dependency(host);
418 }
419
420 // check if 'this' and k are nestmates (same nest_host), or k is our nest_host,
421 // or we are k's nest_host - all of which is covered by comparing the two
422 // resolved_nest_hosts.
423 // Any exceptions (i.e. VMEs) are propagated.
424 bool InstanceKlass::has_nestmate_access_to(InstanceKlass* k, TRAPS) {
425
426 assert(this != k, "this should be handled by higher-level code");
427
428 // Per JVMS 5.4.4 we first resolve and validate the current class, then
429 // the target class k.
430
431 InstanceKlass* cur_host = nest_host(CHECK_false);
432 if (cur_host == nullptr) {
433 return false;
434 }
435
436 Klass* k_nest_host = k->nest_host(CHECK_false);
437 if (k_nest_host == nullptr) {
438 return false;
439 }
440
441 bool access = (cur_host == k_nest_host);
442
443 ResourceMark rm(THREAD);
444 log_trace(class, nestmates)("Class %s does %shave nestmate access to %s",
445 this->external_name(),
446 access ? "" : "NOT ",
447 k->external_name());
448 return access;
449 }
450
451 const char* InstanceKlass::nest_host_error() {
452 if (_nest_host_index == 0) {
453 return nullptr;
454 } else {
455 constantPoolHandle cph(Thread::current(), constants());
456 return SystemDictionary::find_nest_host_error(cph, (int)_nest_host_index);
457 }
458 }
459
460 void* InstanceKlass::operator new(size_t size, ClassLoaderData* loader_data, size_t word_size,
461 bool use_class_space, TRAPS) throw() {
462 return Metaspace::allocate(loader_data, word_size, ClassType, use_class_space, THREAD);
463 }
464
465 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) {
466 const int size = InstanceKlass::size(parser.vtable_size(),
467 parser.itable_size(),
468 nonstatic_oop_map_size(parser.total_oop_map_count()),
469 parser.is_interface());
470
471 const Symbol* const class_name = parser.class_name();
472 assert(class_name != nullptr, "invariant");
473 ClassLoaderData* loader_data = parser.loader_data();
474 assert(loader_data != nullptr, "invariant");
475
476 InstanceKlass* ik;
477 const bool use_class_space = UseClassMetaspaceForAllClasses || parser.klass_needs_narrow_id();
478
479 // Allocation
480 if (parser.is_instance_ref_klass()) {
481 // java.lang.ref.Reference
482 ik = new (loader_data, size, use_class_space, THREAD) InstanceRefKlass(parser);
483 } else if (class_name == vmSymbols::java_lang_Class()) {
484 // mirror - java.lang.Class
485 ik = new (loader_data, size, use_class_space, THREAD) InstanceMirrorKlass(parser);
486 } else if (is_stack_chunk_class(class_name, loader_data)) {
487 // stack chunk
488 ik = new (loader_data, size, use_class_space, THREAD) InstanceStackChunkKlass(parser);
489 } else if (is_class_loader(class_name, parser)) {
490 // class loader - java.lang.ClassLoader
491 ik = new (loader_data, size, use_class_space, THREAD) InstanceClassLoaderKlass(parser);
492 } else {
493 // normal
494 ik = new (loader_data, size, use_class_space, THREAD) InstanceKlass(parser);
495 }
496
497 if (ik != nullptr && UseCompressedClassPointers && use_class_space) {
498 assert(CompressedKlassPointers::is_encodable(ik),
499 "Klass " PTR_FORMAT "needs a narrow Klass ID, but is not encodable", p2i(ik));
500 }
501
502 // Check for pending exception before adding to the loader data and incrementing
503 // class count. Can get OOM here.
504 if (HAS_PENDING_EXCEPTION) {
505 return nullptr;
506 }
507
508 return ik;
509 }
510
511
512 // copy method ordering from resource area to Metaspace
513 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) {
514 if (m != nullptr) {
515 // allocate a new array and copy contents (memcpy?)
516 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
517 for (int i = 0; i < m->length(); i++) {
518 _method_ordering->at_put(i, m->at(i));
519 }
520 } else {
521 _method_ordering = Universe::the_empty_int_array();
522 }
523 }
524
525 // create a new array of vtable_indices for default methods
526 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
527 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
528 assert(default_vtable_indices() == nullptr, "only create once");
529 set_default_vtable_indices(vtable_indices);
530 return vtable_indices;
531 }
532
533
534 InstanceKlass::InstanceKlass() {
535 assert(CDSConfig::is_dumping_static_archive() || CDSConfig::is_using_archive(), "only for CDS");
536 }
537
538 InstanceKlass::InstanceKlass(const ClassFileParser& parser, KlassKind kind, ReferenceType reference_type) :
539 Klass(kind),
540 _nest_members(nullptr),
541 _nest_host(nullptr),
542 _permitted_subclasses(nullptr),
543 _record_components(nullptr),
544 _static_field_size(parser.static_field_size()),
545 _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())),
546 _itable_len(parser.itable_size()),
547 _nest_host_index(0),
548 _init_state(allocated),
549 _reference_type(reference_type),
550 _init_thread(nullptr)
551 {
552 set_vtable_length(parser.vtable_size());
553 set_access_flags(parser.access_flags());
554 if (parser.is_hidden()) set_is_hidden();
555 set_layout_helper(Klass::instance_layout_helper(parser.layout_size(),
556 false));
557
558 assert(nullptr == _methods, "underlying memory not zeroed?");
559 assert(is_instance_klass(), "is layout incorrect?");
560 assert(size_helper() == parser.layout_size(), "incorrect size_helper?");
561 }
562
563 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
564 Array<Method*>* methods) {
565 if (methods != nullptr && methods != Universe::the_empty_method_array() &&
566 !methods->in_aot_cache()) {
567 for (int i = 0; i < methods->length(); i++) {
568 Method* method = methods->at(i);
569 if (method == nullptr) continue; // maybe null if error processing
570 // Only want to delete methods that are not executing for RedefineClasses.
571 // The previous version will point to them so they're not totally dangling
572 assert (!method->on_stack(), "shouldn't be called with methods on stack");
573 MetadataFactory::free_metadata(loader_data, method);
574 }
575 MetadataFactory::free_array<Method*>(loader_data, methods);
576 }
577 }
578
579 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
580 const InstanceKlass* super_klass,
581 Array<InstanceKlass*>* local_interfaces,
582 Array<InstanceKlass*>* transitive_interfaces) {
583 // Only deallocate transitive interfaces if not empty, same as super class
584 // or same as local interfaces. See code in parseClassFile.
585 Array<InstanceKlass*>* ti = transitive_interfaces;
586 if (ti != Universe::the_empty_instance_klass_array() && ti != local_interfaces) {
587 // check that the interfaces don't come from super class
588 Array<InstanceKlass*>* sti = (super_klass == nullptr) ? nullptr :
589 super_klass->transitive_interfaces();
590 if (ti != sti && ti != nullptr && !ti->in_aot_cache()) {
591 MetadataFactory::free_array<InstanceKlass*>(loader_data, ti);
592 }
593 }
594
595 // local interfaces can be empty
596 if (local_interfaces != Universe::the_empty_instance_klass_array() &&
597 local_interfaces != nullptr && !local_interfaces->in_aot_cache()) {
598 MetadataFactory::free_array<InstanceKlass*>(loader_data, local_interfaces);
599 }
600 }
601
602 void InstanceKlass::deallocate_record_components(ClassLoaderData* loader_data,
603 Array<RecordComponent*>* record_components) {
604 if (record_components != nullptr && !record_components->in_aot_cache()) {
605 for (int i = 0; i < record_components->length(); i++) {
606 RecordComponent* record_component = record_components->at(i);
607 MetadataFactory::free_metadata(loader_data, record_component);
608 }
609 MetadataFactory::free_array<RecordComponent*>(loader_data, record_components);
610 }
611 }
612
613 // This function deallocates the metadata and C heap pointers that the
614 // InstanceKlass points to.
615 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
616 // Orphan the mirror first, CMS thinks it's still live.
617 if (java_mirror() != nullptr) {
618 java_lang_Class::set_klass(java_mirror(), nullptr);
619 }
620
621 // Also remove mirror from handles
622 loader_data->remove_handle(_java_mirror);
623
624 // Need to take this class off the class loader data list.
625 loader_data->remove_class(this);
626
627 // The array_klass for this class is created later, after error handling.
628 // For class redefinition, we keep the original class so this scratch class
629 // doesn't have an array class. Either way, assert that there is nothing
630 // to deallocate.
631 assert(array_klasses() == nullptr, "array classes shouldn't be created for this class yet");
632
633 // Release C heap allocated data that this points to, which includes
634 // reference counting symbol names.
635 // Can't release the constant pool or MethodData C heap data here because the constant
636 // pool can be deallocated separately from the InstanceKlass for default methods and
637 // redefine classes. MethodData can also be released separately.
638 release_C_heap_structures(/* release_sub_metadata */ false);
639
640 deallocate_methods(loader_data, methods());
641 set_methods(nullptr);
642
643 deallocate_record_components(loader_data, record_components());
644 set_record_components(nullptr);
645
646 if (method_ordering() != nullptr &&
647 method_ordering() != Universe::the_empty_int_array() &&
648 !method_ordering()->in_aot_cache()) {
649 MetadataFactory::free_array<int>(loader_data, method_ordering());
650 }
651 set_method_ordering(nullptr);
652
653 // default methods can be empty
654 if (default_methods() != nullptr &&
655 default_methods() != Universe::the_empty_method_array() &&
656 !default_methods()->in_aot_cache()) {
657 MetadataFactory::free_array<Method*>(loader_data, default_methods());
658 }
659 // Do NOT deallocate the default methods, they are owned by superinterfaces.
660 set_default_methods(nullptr);
661
662 // default methods vtable indices can be empty
663 if (default_vtable_indices() != nullptr &&
664 !default_vtable_indices()->in_aot_cache()) {
665 MetadataFactory::free_array<int>(loader_data, default_vtable_indices());
666 }
667 set_default_vtable_indices(nullptr);
668
669
670 // This array is in Klass, but remove it with the InstanceKlass since
671 // this place would be the only caller and it can share memory with transitive
672 // interfaces.
673 if (secondary_supers() != nullptr &&
674 secondary_supers() != Universe::the_empty_klass_array() &&
675 // see comments in compute_secondary_supers about the following cast
676 (address)(secondary_supers()) != (address)(transitive_interfaces()) &&
677 !secondary_supers()->in_aot_cache()) {
678 MetadataFactory::free_array<Klass*>(loader_data, secondary_supers());
679 }
680 set_secondary_supers(nullptr, SECONDARY_SUPERS_BITMAP_EMPTY);
681
682 deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces());
683 set_transitive_interfaces(nullptr);
684 set_local_interfaces(nullptr);
685
686 if (fieldinfo_stream() != nullptr && !fieldinfo_stream()->in_aot_cache()) {
687 MetadataFactory::free_array<u1>(loader_data, fieldinfo_stream());
688 }
689 set_fieldinfo_stream(nullptr);
690
691 if (fieldinfo_search_table() != nullptr && !fieldinfo_search_table()->in_aot_cache()) {
692 MetadataFactory::free_array<u1>(loader_data, fieldinfo_search_table());
693 }
694 set_fieldinfo_search_table(nullptr);
695
696 if (fields_status() != nullptr && !fields_status()->in_aot_cache()) {
697 MetadataFactory::free_array<FieldStatus>(loader_data, fields_status());
698 }
699 set_fields_status(nullptr);
700
701 // If a method from a redefined class is using this constant pool, don't
702 // delete it, yet. The new class's previous version will point to this.
703 if (constants() != nullptr) {
704 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack");
705 if (!constants()->in_aot_cache()) {
706 MetadataFactory::free_metadata(loader_data, constants());
707 }
708 // Delete any cached resolution errors for the constant pool
709 SystemDictionary::delete_resolution_error(constants());
710
711 set_constants(nullptr);
712 }
713
714 if (inner_classes() != nullptr &&
715 inner_classes() != Universe::the_empty_short_array() &&
716 !inner_classes()->in_aot_cache()) {
717 MetadataFactory::free_array<jushort>(loader_data, inner_classes());
718 }
719 set_inner_classes(nullptr);
720
721 if (nest_members() != nullptr &&
722 nest_members() != Universe::the_empty_short_array() &&
723 !nest_members()->in_aot_cache()) {
724 MetadataFactory::free_array<jushort>(loader_data, nest_members());
725 }
726 set_nest_members(nullptr);
727
728 if (permitted_subclasses() != nullptr &&
729 permitted_subclasses() != Universe::the_empty_short_array() &&
730 !permitted_subclasses()->in_aot_cache()) {
731 MetadataFactory::free_array<jushort>(loader_data, permitted_subclasses());
732 }
733 set_permitted_subclasses(nullptr);
734
735 // We should deallocate the Annotations instance if it's not in shared spaces.
736 if (annotations() != nullptr && !annotations()->in_aot_cache()) {
737 MetadataFactory::free_metadata(loader_data, annotations());
738 }
739 set_annotations(nullptr);
740
741 SystemDictionaryShared::handle_class_unloading(this);
742
743 #if INCLUDE_CDS_JAVA_HEAP
744 if (CDSConfig::is_dumping_heap()) {
745 HeapShared::remove_scratch_objects(this);
746 }
747 #endif
748 }
749
750 bool InstanceKlass::is_record() const {
751 return _record_components != nullptr &&
752 is_final() &&
753 super() == vmClasses::Record_klass();
754 }
755
756 bool InstanceKlass::is_sealed() const {
757 return _permitted_subclasses != nullptr &&
758 _permitted_subclasses != Universe::the_empty_short_array();
759 }
760
761 // JLS 8.9: An enum class is either implicitly final and derives
762 // from java.lang.Enum, or else is implicitly sealed to its
763 // anonymous subclasses. This query detects both kinds.
764 // It does not validate the finality or
765 // sealing conditions: it merely checks for a super of Enum.
766 // This is sufficient for recognizing well-formed enums.
767 bool InstanceKlass::is_enum_subclass() const {
768 InstanceKlass* s = super();
769 return (s == vmClasses::Enum_klass() ||
770 (s != nullptr && s->super() == vmClasses::Enum_klass()));
771 }
772
773 bool InstanceKlass::should_be_initialized() const {
774 return !is_initialized();
775 }
776
777 klassItable InstanceKlass::itable() const {
778 return klassItable(const_cast<InstanceKlass*>(this));
779 }
780
781 // JVMTI spec thinks there are signers and protection domain in the
782 // instanceKlass. These accessors pretend these fields are there.
783 // The hprof specification also thinks these fields are in InstanceKlass.
784 oop InstanceKlass::protection_domain() const {
785 // return the protection_domain from the mirror
786 return java_lang_Class::protection_domain(java_mirror());
787 }
788
789 objArrayOop InstanceKlass::signers() const {
790 // return the signers from the mirror
791 return java_lang_Class::signers(java_mirror());
792 }
793
794 oop InstanceKlass::init_lock() const {
795 // return the init lock from the mirror
796 oop lock = java_lang_Class::init_lock(java_mirror());
797 // Prevent reordering with any access of initialization state
798 OrderAccess::loadload();
799 assert(lock != nullptr || !is_not_initialized(), // initialized or in_error state
800 "only fully initialized state can have a null lock");
801 return lock;
802 }
803
804 // Set the initialization lock to null so the object can be GC'ed. Any racing
805 // threads to get this lock will see a null lock and will not lock.
806 // That's okay because they all check for initialized state after getting
807 // the lock and return.
808 void InstanceKlass::fence_and_clear_init_lock() {
809 // make sure previous stores are all done, notably the init_state.
810 OrderAccess::storestore();
811 java_lang_Class::clear_init_lock(java_mirror());
812 assert(!is_not_initialized(), "class must be initialized now");
813 }
814
815
816 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization
817 // process. The step comments refers to the procedure described in that section.
818 // Note: implementation moved to static method to expose the this pointer.
819 void InstanceKlass::initialize(TRAPS) {
820 if (this->should_be_initialized()) {
821 initialize_impl(CHECK);
822 // Note: at this point the class may be initialized
823 // OR it may be in the state of being initialized
824 // in case of recursive initialization!
825 } else {
826 assert(is_initialized(), "sanity check");
827 }
828 }
829
830 #ifdef ASSERT
831 void InstanceKlass::assert_no_clinit_will_run_for_aot_initialized_class() const {
832 assert(has_aot_initialized_mirror(), "must be");
833
834 InstanceKlass* s = super();
835 if (s != nullptr) {
836 DEBUG_ONLY(ResourceMark rm);
837 assert(s->is_initialized(), "super class %s of aot-inited class %s must have been initialized",
838 s->external_name(), external_name());
839 s->assert_no_clinit_will_run_for_aot_initialized_class();
840 }
841
842 Array<InstanceKlass*>* interfaces = local_interfaces();
843 int len = interfaces->length();
844 for (int i = 0; i < len; i++) {
845 InstanceKlass* intf = interfaces->at(i);
846 if (!intf->is_initialized()) {
847 ResourceMark rm;
848 // Note: an interface needs to be marked as is_initialized() only if
849 // - it has a <clinit>
850 // - it has declared a default method.
851 assert(!intf->interface_needs_clinit_execution_as_super(/*also_check_supers*/false),
852 "uninitialized super interface %s of aot-inited class %s must not have <clinit>",
853 intf->external_name(), external_name());
854 }
855 }
856 }
857 #endif
858
859 #if INCLUDE_CDS
860 void InstanceKlass::initialize_with_aot_initialized_mirror(TRAPS) {
861 assert(has_aot_initialized_mirror(), "must be");
862 assert(CDSConfig::is_loading_heap(), "must be");
863 assert(CDSConfig::is_using_aot_linked_classes(), "must be");
864 assert_no_clinit_will_run_for_aot_initialized_class();
865
866 if (is_initialized()) {
867 return;
868 }
869
870 if (is_runtime_setup_required()) {
871 // Need to take the slow path, which will call the runtimeSetup() function instead
872 // of <clinit>
873 initialize(CHECK);
874 return;
875 }
876 if (log_is_enabled(Info, aot, init)) {
877 ResourceMark rm;
878 log_info(aot, init)("%s (aot-inited)", external_name());
879 }
880
881 link_class(CHECK);
882
883 #ifdef ASSERT
884 {
885 Handle h_init_lock(THREAD, init_lock());
886 ObjectLocker ol(h_init_lock, THREAD);
887 assert(!is_initialized(), "sanity");
888 assert(!is_being_initialized(), "sanity");
889 assert(!is_in_error_state(), "sanity");
890 }
891 #endif
892
893 set_init_thread(THREAD);
894 set_initialization_state_and_notify(fully_initialized, CHECK);
895 }
896 #endif
897
898 bool InstanceKlass::verify_code(TRAPS) {
899 // 1) Verify the bytecodes
900 return Verifier::verify(this, should_verify_class(), THREAD);
901 }
902
903 void InstanceKlass::link_class(TRAPS) {
904 assert(is_loaded(), "must be loaded");
905 if (!is_linked()) {
906 link_class_impl(CHECK);
907 }
908 }
909
910 // Called to verify that a class can link during initialization, without
911 // throwing a VerifyError.
912 bool InstanceKlass::link_class_or_fail(TRAPS) {
913 assert(is_loaded(), "must be loaded");
914 if (!is_linked()) {
915 link_class_impl(CHECK_false);
916 }
917 return is_linked();
918 }
919
920 bool InstanceKlass::link_class_impl(TRAPS) {
921 if (CDSConfig::is_dumping_static_archive() && SystemDictionaryShared::has_class_failed_verification(this)) {
922 // This is for CDS static dump only -- we use the in_error_state to indicate that
923 // the class has failed verification. Throwing the NoClassDefFoundError here is just
924 // a convenient way to stop repeat attempts to verify the same (bad) class.
925 //
926 // Note that the NoClassDefFoundError is not part of the JLS, and should not be thrown
927 // if we are executing Java code. This is not a problem for CDS dumping phase since
928 // it doesn't execute any Java code.
929 ResourceMark rm(THREAD);
930 // Names are all known to be < 64k so we know this formatted message is not excessively large.
931 Exceptions::fthrow(THREAD_AND_LOCATION,
932 vmSymbols::java_lang_NoClassDefFoundError(),
933 "Class %s, or one of its supertypes, failed class initialization",
934 external_name());
935 return false;
936 }
937 // return if already verified
938 if (is_linked()) {
939 return true;
940 }
941
942 // Timing
943 // timer handles recursion
944 JavaThread* jt = THREAD;
945
946 // link super class before linking this class
947 InstanceKlass* super_klass = super();
948 if (super_klass != nullptr) {
949 if (super_klass->is_interface()) { // check if super class is an interface
950 ResourceMark rm(THREAD);
951 // Names are all known to be < 64k so we know this formatted message is not excessively large.
952 Exceptions::fthrow(
953 THREAD_AND_LOCATION,
954 vmSymbols::java_lang_IncompatibleClassChangeError(),
955 "class %s has interface %s as super class",
956 external_name(),
957 super_klass->external_name()
958 );
959 return false;
960 }
961
962 super_klass->link_class_impl(CHECK_false);
963 }
964
965 // link all interfaces implemented by this class before linking this class
966 Array<InstanceKlass*>* interfaces = local_interfaces();
967 int num_interfaces = interfaces->length();
968 for (int index = 0; index < num_interfaces; index++) {
969 InstanceKlass* interk = interfaces->at(index);
970 interk->link_class_impl(CHECK_false);
971 }
972
973 // in case the class is linked in the process of linking its superclasses
974 if (is_linked()) {
975 return true;
976 }
977
978 // trace only the link time for this klass that includes
979 // the verification time
980 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
981 ClassLoader::perf_class_link_selftime(),
982 ClassLoader::perf_classes_linked(),
983 jt->get_thread_stat()->perf_recursion_counts_addr(),
984 jt->get_thread_stat()->perf_timers_addr(),
985 PerfClassTraceTime::CLASS_LINK);
986
987 // verification & rewriting
988 {
989 HandleMark hm(THREAD);
990 Handle h_init_lock(THREAD, init_lock());
991 ObjectLocker ol(h_init_lock, jt);
992 // rewritten will have been set if loader constraint error found
993 // on an earlier link attempt
994 // don't verify or rewrite if already rewritten
995 //
996
997 if (!is_linked()) {
998 if (!is_rewritten()) {
999 if (in_aot_cache()) {
1000 assert(!verified_at_dump_time(), "must be");
1001 }
1002 {
1003 bool verify_ok = verify_code(THREAD);
1004 if (!verify_ok) {
1005 return false;
1006 }
1007 }
1008
1009 // Just in case a side-effect of verify linked this class already
1010 // (which can sometimes happen since the verifier loads classes
1011 // using custom class loaders, which are free to initialize things)
1012 if (is_linked()) {
1013 return true;
1014 }
1015
1016 // also sets rewritten
1017 rewrite_class(CHECK_false);
1018 } else if (in_aot_cache()) {
1019 SystemDictionaryShared::check_verification_constraints(this, CHECK_false);
1020 }
1021
1022 // relocate jsrs and link methods after they are all rewritten
1023 link_methods(CHECK_false);
1024
1025 // Initialize the vtable and interface table after
1026 // methods have been rewritten since rewrite may
1027 // fabricate new Method*s.
1028 // also does loader constraint checking
1029 //
1030 // initialize_vtable and initialize_itable need to be rerun
1031 // for a shared class if
1032 // 1) the class is loaded by custom class loader or
1033 // 2) the class is loaded by built-in class loader but failed to add archived loader constraints or
1034 // 3) the class was not verified during dump time
1035 bool need_init_table = true;
1036 if (in_aot_cache() && verified_at_dump_time() &&
1037 SystemDictionaryShared::check_linking_constraints(THREAD, this)) {
1038 need_init_table = false;
1039 }
1040 if (need_init_table) {
1041 vtable().initialize_vtable_and_check_constraints(CHECK_false);
1042 itable().initialize_itable_and_check_constraints(CHECK_false);
1043 }
1044 #ifdef ASSERT
1045 vtable().verify(tty, true);
1046 // In case itable verification is ever added.
1047 // itable().verify(tty, true);
1048 #endif
1049 if (Universe::is_fully_initialized()) {
1050 DeoptimizationScope deopt_scope;
1051 {
1052 // Now mark all code that assumes the class is not linked.
1053 // Set state under the Compile_lock also.
1054 MutexLocker ml(THREAD, Compile_lock);
1055
1056 set_init_state(linked);
1057 CodeCache::mark_dependents_on(&deopt_scope, this);
1058 }
1059 // Perform the deopt handshake outside Compile_lock.
1060 deopt_scope.deoptimize_marked();
1061 } else {
1062 set_init_state(linked);
1063 }
1064 if (JvmtiExport::should_post_class_prepare()) {
1065 JvmtiExport::post_class_prepare(THREAD, this);
1066 }
1067 }
1068 }
1069 return true;
1070 }
1071
1072 // Rewrite the byte codes of all of the methods of a class.
1073 // The rewriter must be called exactly once. Rewriting must happen after
1074 // verification but before the first method of the class is executed.
1075 void InstanceKlass::rewrite_class(TRAPS) {
1076 assert(is_loaded(), "must be loaded");
1077 if (is_rewritten()) {
1078 assert(in_aot_cache(), "rewriting an unshared class?");
1079 return;
1080 }
1081 Rewriter::rewrite(this, CHECK);
1082 set_rewritten();
1083 }
1084
1085 // Now relocate and link method entry points after class is rewritten.
1086 // This is outside is_rewritten flag. In case of an exception, it can be
1087 // executed more than once.
1088 void InstanceKlass::link_methods(TRAPS) {
1089 PerfTraceElapsedTime timer(ClassLoader::perf_ik_link_methods_time());
1090
1091 int len = methods()->length();
1092 for (int i = len-1; i >= 0; i--) {
1093 methodHandle m(THREAD, methods()->at(i));
1094 RuntimeUpcalls::install_upcalls(m);
1095
1096 // Set up method entry points for compiler and interpreter .
1097 m->link_method(m, CHECK);
1098 }
1099 }
1100
1101 // Eagerly initialize superinterfaces that declare default methods (concrete instance: any access)
1102 void InstanceKlass::initialize_super_interfaces(TRAPS) {
1103 assert (has_nonstatic_concrete_methods(), "caller should have checked this");
1104 for (int i = 0; i < local_interfaces()->length(); ++i) {
1105 InstanceKlass* ik = local_interfaces()->at(i);
1106
1107 // Initialization is depth first search ie. we start with top of the inheritance tree
1108 // has_nonstatic_concrete_methods drives searching superinterfaces since it
1109 // means has_nonstatic_concrete_methods in its superinterface hierarchy
1110 if (ik->has_nonstatic_concrete_methods()) {
1111 ik->initialize_super_interfaces(CHECK);
1112 }
1113
1114 // Only initialize() interfaces that "declare" concrete methods.
1115 if (ik->should_be_initialized() && ik->declares_nonstatic_concrete_methods()) {
1116 ik->initialize(CHECK);
1117 }
1118 }
1119 }
1120
1121 using InitializationErrorTable = HashTable<const InstanceKlass*, OopHandle, 107, AnyObj::C_HEAP, mtClass>;
1122 static InitializationErrorTable* _initialization_error_table;
1123
1124 void InstanceKlass::add_initialization_error(JavaThread* current, Handle exception) {
1125 // Create the same exception with a message indicating the thread name,
1126 // and the StackTraceElements.
1127 Handle init_error = java_lang_Throwable::create_initialization_error(current, exception);
1128 ResourceMark rm(current);
1129 if (init_error.is_null()) {
1130 log_trace(class, init)("Unable to create the desired initialization error for class %s", external_name());
1131
1132 // We failed to create the new exception, most likely due to either out-of-memory or
1133 // a stackoverflow error. If the original exception was either of those then we save
1134 // the shared, pre-allocated, stackless, instance of that exception.
1135 if (exception->klass() == vmClasses::StackOverflowError_klass()) {
1136 log_debug(class, init)("Using shared StackOverflowError as initialization error for class %s", external_name());
1137 init_error = Handle(current, Universe::class_init_stack_overflow_error());
1138 } else if (exception->klass() == vmClasses::OutOfMemoryError_klass()) {
1139 log_debug(class, init)("Using shared OutOfMemoryError as initialization error for class %s", external_name());
1140 init_error = Handle(current, Universe::class_init_out_of_memory_error());
1141 } else {
1142 return;
1143 }
1144 }
1145
1146 MutexLocker ml(current, ClassInitError_lock);
1147 OopHandle elem = OopHandle(Universe::vm_global(), init_error());
1148 bool created;
1149 if (_initialization_error_table == nullptr) {
1150 _initialization_error_table = new (mtClass) InitializationErrorTable();
1151 }
1152 _initialization_error_table->put_if_absent(this, elem, &created);
1153 assert(created, "Initialization is single threaded");
1154 log_trace(class, init)("Initialization error added for class %s", external_name());
1155 }
1156
1157 oop InstanceKlass::get_initialization_error(JavaThread* current) {
1158 MutexLocker ml(current, ClassInitError_lock);
1159 if (_initialization_error_table == nullptr) {
1160 return nullptr;
1161 }
1162 OopHandle* h = _initialization_error_table->get(this);
1163 return (h != nullptr) ? h->resolve() : nullptr;
1164 }
1165
1166 // Need to remove entries for unloaded classes.
1167 void InstanceKlass::clean_initialization_error_table() {
1168 struct InitErrorTableCleaner {
1169 bool do_entry(const InstanceKlass* ik, OopHandle h) {
1170 if (!ik->is_loader_alive()) {
1171 h.release(Universe::vm_global());
1172 return true;
1173 } else {
1174 return false;
1175 }
1176 }
1177 };
1178
1179 assert_locked_or_safepoint(ClassInitError_lock);
1180 InitErrorTableCleaner cleaner;
1181 if (_initialization_error_table != nullptr) {
1182 _initialization_error_table->unlink(&cleaner);
1183 }
1184 }
1185
1186 void InstanceKlass::initialize_impl(TRAPS) {
1187 HandleMark hm(THREAD);
1188
1189 // Make sure klass is linked (verified) before initialization
1190 // A class could already be verified, since it has been reflected upon.
1191 link_class(CHECK);
1192
1193 DTRACE_CLASSINIT_PROBE(required, -1);
1194
1195 bool wait = false;
1196
1197 JavaThread* jt = THREAD;
1198
1199 if (ForceProfiling) {
1200 // Preallocate MDOs.
1201 for (int i = 0; i < methods()->length(); i++) {
1202 assert(!HAS_PENDING_EXCEPTION, "");
1203 methodHandle m(THREAD, methods()->at(i));
1204 Method::build_profiling_method_data(m, THREAD);
1205 if (HAS_PENDING_EXCEPTION) {
1206 ResourceMark rm;
1207 log_warning(cds)("MDO preallocation failed for %s", external_name());
1208 CLEAR_PENDING_EXCEPTION;
1209 break;
1210 }
1211 }
1212 }
1213
1214 bool debug_logging_enabled = log_is_enabled(Debug, class, init);
1215
1216 // refer to the JVM book page 47 for description of steps
1217 // Step 1
1218 {
1219 Handle h_init_lock(THREAD, init_lock());
1220 ObjectLocker ol(h_init_lock, jt);
1221
1222 // Step 2
1223 // If we were to use wait() instead of waitInterruptibly() then
1224 // we might end up throwing IE from link/symbol resolution sites
1225 // that aren't expected to throw. This would wreak havoc. See 6320309.
1226 while (is_being_initialized() && !is_reentrant_initialization(jt)) {
1227 if (debug_logging_enabled) {
1228 ResourceMark rm(jt);
1229 log_debug(class, init)("Thread \"%s\" waiting for initialization of %s by thread \"%s\"",
1230 jt->name(), external_name(), init_thread_name());
1231 }
1232 wait = true;
1233 jt->set_class_to_be_initialized(this);
1234 ol.wait_uninterruptibly(jt);
1235 jt->set_class_to_be_initialized(nullptr);
1236 }
1237
1238 // Step 3
1239 if (is_being_initialized() && is_reentrant_initialization(jt)) {
1240 if (debug_logging_enabled) {
1241 ResourceMark rm(jt);
1242 log_debug(class, init)("Thread \"%s\" recursively initializing %s",
1243 jt->name(), external_name());
1244 }
1245 DTRACE_CLASSINIT_PROBE_WAIT(recursive, -1, wait);
1246 return;
1247 }
1248
1249 // Step 4
1250 if (is_initialized()) {
1251 if (debug_logging_enabled) {
1252 ResourceMark rm(jt);
1253 log_debug(class, init)("Thread \"%s\" found %s already initialized",
1254 jt->name(), external_name());
1255 }
1256 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, -1, wait);
1257 return;
1258 }
1259
1260 // Step 5
1261 if (is_in_error_state()) {
1262 if (debug_logging_enabled) {
1263 ResourceMark rm(jt);
1264 log_debug(class, init)("Thread \"%s\" found %s is in error state",
1265 jt->name(), external_name());
1266 }
1267
1268 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait);
1269 ResourceMark rm(THREAD);
1270 Handle cause(THREAD, get_initialization_error(THREAD));
1271
1272 stringStream ss;
1273 ss.print("Could not initialize class %s", external_name());
1274 if (cause.is_null()) {
1275 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), ss.as_string());
1276 } else {
1277 THROW_MSG_CAUSE(vmSymbols::java_lang_NoClassDefFoundError(),
1278 ss.as_string(), cause);
1279 }
1280 } else {
1281
1282 // Step 6
1283 set_init_state(being_initialized);
1284 set_init_thread(jt);
1285 if (debug_logging_enabled) {
1286 ResourceMark rm(jt);
1287 log_debug(class, init)("Thread \"%s\" is initializing %s",
1288 jt->name(), external_name());
1289 }
1290 }
1291 }
1292
1293 // Step 7
1294 // Next, if C is a class rather than an interface, initialize it's super class and super
1295 // interfaces.
1296 if (!is_interface()) {
1297 Klass* super_klass = super();
1298 if (super_klass != nullptr && super_klass->should_be_initialized()) {
1299 super_klass->initialize(THREAD);
1300 }
1301 // If C implements any interface that declares a non-static, concrete method,
1302 // the initialization of C triggers initialization of its super interfaces.
1303 // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and
1304 // having a superinterface that declares, non-static, concrete methods
1305 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) {
1306 initialize_super_interfaces(THREAD);
1307 }
1308
1309 // If any exceptions, complete abruptly, throwing the same exception as above.
1310 if (HAS_PENDING_EXCEPTION) {
1311 Handle e(THREAD, PENDING_EXCEPTION);
1312 CLEAR_PENDING_EXCEPTION;
1313 {
1314 EXCEPTION_MARK;
1315 add_initialization_error(THREAD, e);
1316 // Locks object, set state, and notify all waiting threads
1317 set_initialization_state_and_notify(initialization_error, THREAD);
1318 CLEAR_PENDING_EXCEPTION;
1319 }
1320 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait);
1321 THROW_OOP(e());
1322 }
1323 }
1324
1325
1326 // Step 8
1327 {
1328 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
1329 if (class_initializer() != nullptr) {
1330 // Timer includes any side effects of class initialization (resolution,
1331 // etc), but not recursive entry into call_class_initializer().
1332 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
1333 ClassLoader::perf_class_init_selftime(),
1334 ClassLoader::perf_classes_inited(),
1335 jt->get_thread_stat()->perf_recursion_counts_addr(),
1336 jt->get_thread_stat()->perf_timers_addr(),
1337 PerfClassTraceTime::CLASS_CLINIT);
1338 call_class_initializer(THREAD);
1339 } else {
1340 // The elapsed time is so small it's not worth counting.
1341 if (UsePerfData) {
1342 ClassLoader::perf_classes_inited()->inc();
1343 }
1344 call_class_initializer(THREAD);
1345 }
1346 }
1347
1348 // Step 9
1349 if (!HAS_PENDING_EXCEPTION) {
1350 set_initialization_state_and_notify(fully_initialized, CHECK);
1351 DEBUG_ONLY(vtable().verify(tty, true);)
1352 CompilationPolicy::replay_training_at_init(this, THREAD);
1353 }
1354 else {
1355 // Step 10 and 11
1356 Handle e(THREAD, PENDING_EXCEPTION);
1357 CLEAR_PENDING_EXCEPTION;
1358 // JVMTI has already reported the pending exception
1359 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1360 JvmtiExport::clear_detected_exception(jt);
1361 {
1362 EXCEPTION_MARK;
1363 add_initialization_error(THREAD, e);
1364 set_initialization_state_and_notify(initialization_error, THREAD);
1365 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below
1366 // JVMTI has already reported the pending exception
1367 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1368 JvmtiExport::clear_detected_exception(jt);
1369 }
1370 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
1371 if (e->is_a(vmClasses::Error_klass())) {
1372 THROW_OOP(e());
1373 } else {
1374 JavaCallArguments args(e);
1375 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
1376 vmSymbols::throwable_void_signature(),
1377 &args);
1378 }
1379 }
1380 DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait);
1381 }
1382
1383 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) {
1384 Handle h_init_lock(THREAD, init_lock());
1385 if (h_init_lock() != nullptr) {
1386 ObjectLocker ol(h_init_lock, THREAD);
1387 set_init_thread(nullptr); // reset _init_thread before changing _init_state
1388 set_init_state(state);
1389 fence_and_clear_init_lock();
1390 ol.notify_all(CHECK);
1391 } else {
1392 assert(h_init_lock() != nullptr, "The initialization state should never be set twice");
1393 set_init_thread(nullptr); // reset _init_thread before changing _init_state
1394 set_init_state(state);
1395 }
1396 }
1397
1398 // Update hierarchy. This is done before the new klass has been added to the SystemDictionary. The Compile_lock
1399 // is grabbed, to ensure that the compiler is not using the class hierarchy.
1400 void InstanceKlass::add_to_hierarchy(JavaThread* current) {
1401 assert(!SafepointSynchronize::is_at_safepoint(), "must NOT be at safepoint");
1402
1403 DeoptimizationScope deopt_scope;
1404 {
1405 MutexLocker ml(current, Compile_lock);
1406
1407 set_init_state(InstanceKlass::loaded);
1408 // make sure init_state store is already done.
1409 // The compiler reads the hierarchy outside of the Compile_lock.
1410 // Access ordering is used to add to hierarchy.
1411
1412 // Link into hierarchy.
1413 append_to_sibling_list(); // add to superklass/sibling list
1414 process_interfaces(); // handle all "implements" declarations
1415
1416 // Now mark all code that depended on old class hierarchy.
1417 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97)
1418 if (Universe::is_fully_initialized()) {
1419 CodeCache::mark_dependents_on(&deopt_scope, this);
1420 }
1421 }
1422 // Perform the deopt handshake outside Compile_lock.
1423 deopt_scope.deoptimize_marked();
1424 }
1425
1426
1427 InstanceKlass* InstanceKlass::implementor() const {
1428 InstanceKlass* volatile* ik = adr_implementor();
1429 if (ik == nullptr) {
1430 return nullptr;
1431 } else {
1432 // This load races with inserts, and therefore needs acquire.
1433 InstanceKlass* ikls = Atomic::load_acquire(ik);
1434 if (ikls != nullptr && !ikls->is_loader_alive()) {
1435 return nullptr; // don't return unloaded class
1436 } else {
1437 return ikls;
1438 }
1439 }
1440 }
1441
1442
1443 void InstanceKlass::set_implementor(InstanceKlass* ik) {
1444 assert_locked_or_safepoint(Compile_lock);
1445 assert(is_interface(), "not interface");
1446 InstanceKlass* volatile* addr = adr_implementor();
1447 assert(addr != nullptr, "null addr");
1448 if (addr != nullptr) {
1449 Atomic::release_store(addr, ik);
1450 }
1451 }
1452
1453 int InstanceKlass::nof_implementors() const {
1454 InstanceKlass* ik = implementor();
1455 if (ik == nullptr) {
1456 return 0;
1457 } else if (ik != this) {
1458 return 1;
1459 } else {
1460 return 2;
1461 }
1462 }
1463
1464 // The embedded _implementor field can only record one implementor.
1465 // When there are more than one implementors, the _implementor field
1466 // is set to the interface Klass* itself. Following are the possible
1467 // values for the _implementor field:
1468 // null - no implementor
1469 // implementor Klass* - one implementor
1470 // self - more than one implementor
1471 //
1472 // The _implementor field only exists for interfaces.
1473 void InstanceKlass::add_implementor(InstanceKlass* ik) {
1474 if (Universe::is_fully_initialized()) {
1475 assert_lock_strong(Compile_lock);
1476 }
1477 assert(is_interface(), "not interface");
1478 // Filter out my subinterfaces.
1479 // (Note: Interfaces are never on the subklass list.)
1480 if (ik->is_interface()) return;
1481
1482 // Filter out subclasses whose supers already implement me.
1483 // (Note: CHA must walk subclasses of direct implementors
1484 // in order to locate indirect implementors.)
1485 InstanceKlass* super_ik = ik->super();
1486 if (super_ik != nullptr && super_ik->implements_interface(this))
1487 // We only need to check one immediate superclass, since the
1488 // implements_interface query looks at transitive_interfaces.
1489 // Any supers of the super have the same (or fewer) transitive_interfaces.
1490 return;
1491
1492 InstanceKlass* iklass = implementor();
1493 if (iklass == nullptr) {
1494 set_implementor(ik);
1495 } else if (iklass != this && iklass != ik) {
1496 // There is already an implementor. Use itself as an indicator of
1497 // more than one implementors.
1498 set_implementor(this);
1499 }
1500
1501 // The implementor also implements the transitive_interfaces
1502 for (int index = 0; index < local_interfaces()->length(); index++) {
1503 local_interfaces()->at(index)->add_implementor(ik);
1504 }
1505 }
1506
1507 void InstanceKlass::init_implementor() {
1508 if (is_interface()) {
1509 set_implementor(nullptr);
1510 }
1511 }
1512
1513
1514 void InstanceKlass::process_interfaces() {
1515 // link this class into the implementors list of every interface it implements
1516 for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
1517 assert(local_interfaces()->at(i)->is_klass(), "must be a klass");
1518 InstanceKlass* interf = local_interfaces()->at(i);
1519 assert(interf->is_interface(), "expected interface");
1520 interf->add_implementor(this);
1521 }
1522 }
1523
1524 bool InstanceKlass::can_be_primary_super_slow() const {
1525 if (is_interface())
1526 return false;
1527 else
1528 return Klass::can_be_primary_super_slow();
1529 }
1530
1531 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots,
1532 Array<InstanceKlass*>* transitive_interfaces) {
1533 // The secondaries are the implemented interfaces.
1534 // We need the cast because Array<Klass*> is NOT a supertype of Array<InstanceKlass*>,
1535 // (but it's safe to do here because we won't write into _secondary_supers from this point on).
1536 Array<Klass*>* interfaces = (Array<Klass*>*)(address)transitive_interfaces;
1537 int num_secondaries = num_extra_slots + interfaces->length();
1538 if (num_secondaries == 0) {
1539 // Must share this for correct bootstrapping!
1540 set_secondary_supers(Universe::the_empty_klass_array(), Universe::the_empty_klass_bitmap());
1541 return nullptr;
1542 } else if (num_extra_slots == 0 && interfaces->length() <= 1) {
1543 // We will reuse the transitive interfaces list if we're certain
1544 // it's in hash order.
1545 uintx bitmap = compute_secondary_supers_bitmap(interfaces);
1546 set_secondary_supers(interfaces, bitmap);
1547 return nullptr;
1548 }
1549 // Copy transitive interfaces to a temporary growable array to be constructed
1550 // into the secondary super list with extra slots.
1551 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length());
1552 for (int i = 0; i < interfaces->length(); i++) {
1553 secondaries->push(interfaces->at(i));
1554 }
1555 return secondaries;
1556 }
1557
1558 bool InstanceKlass::implements_interface(Klass* k) const {
1559 if (this == k) return true;
1560 assert(k->is_interface(), "should be an interface class");
1561 for (int i = 0; i < transitive_interfaces()->length(); i++) {
1562 if (transitive_interfaces()->at(i) == k) {
1563 return true;
1564 }
1565 }
1566 return false;
1567 }
1568
1569 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const {
1570 // Verify direct super interface
1571 if (this == k) return true;
1572 assert(k->is_interface(), "should be an interface class");
1573 for (int i = 0; i < local_interfaces()->length(); i++) {
1574 if (local_interfaces()->at(i) == k) {
1575 return true;
1576 }
1577 }
1578 return false;
1579 }
1580
1581 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) {
1582 check_array_allocation_length(length, arrayOopDesc::max_array_length(T_OBJECT), CHECK_NULL);
1583 size_t size = objArrayOopDesc::object_size(length);
1584 ArrayKlass* ak = array_klass(n, CHECK_NULL);
1585 objArrayOop o = (objArrayOop)Universe::heap()->array_allocate(ak, size, length,
1586 /* do_zero */ true, CHECK_NULL);
1587 return o;
1588 }
1589
1590 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
1591 if (TraceFinalizerRegistration) {
1592 tty->print("Registered ");
1593 i->print_value_on(tty);
1594 tty->print_cr(" (" PTR_FORMAT ") as finalizable", p2i(i));
1595 }
1596 instanceHandle h_i(THREAD, i);
1597 // Pass the handle as argument, JavaCalls::call expects oop as jobjects
1598 JavaValue result(T_VOID);
1599 JavaCallArguments args(h_i);
1600 methodHandle mh(THREAD, Universe::finalizer_register_method());
1601 JavaCalls::call(&result, mh, &args, CHECK_NULL);
1602 MANAGEMENT_ONLY(FinalizerService::on_register(h_i(), THREAD);)
1603 return h_i();
1604 }
1605
1606 instanceOop InstanceKlass::allocate_instance(TRAPS) {
1607 assert(!is_abstract() && !is_interface(), "Should not create this object");
1608 size_t size = size_helper(); // Query before forming handle.
1609 return (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL);
1610 }
1611
1612 instanceOop InstanceKlass::allocate_instance(oop java_class,
1613 const char* who,
1614 TRAPS) {
1615 Klass* k = java_lang_Class::as_Klass(java_class);
1616 if (k == nullptr) {
1617 ResourceMark rm(THREAD);
1618 THROW_(vmSymbols::java_lang_InstantiationException(), nullptr);
1619 }
1620 InstanceKlass* ik = cast(k);
1621 ik->check_valid_for_instantiation(false, CHECK_NULL);
1622 ik->initialize(CHECK_NULL);
1623 return ik->allocate_instance(THREAD);
1624 }
1625
1626 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) {
1627 return instanceHandle(THREAD, allocate_instance(THREAD));
1628 }
1629
1630 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1631 if (is_interface() || is_abstract()) {
1632 ResourceMark rm(THREAD);
1633 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1634 : vmSymbols::java_lang_InstantiationException(), external_name());
1635 }
1636 if (this == vmClasses::Class_klass()) {
1637 ResourceMark rm(THREAD);
1638 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1639 : vmSymbols::java_lang_IllegalAccessException(), external_name());
1640 }
1641 }
1642
1643 ArrayKlass* InstanceKlass::array_klass(int n, TRAPS) {
1644 // Need load-acquire for lock-free read
1645 if (array_klasses_acquire() == nullptr) {
1646
1647 // Recursively lock array allocation
1648 RecursiveLocker rl(MultiArray_lock, THREAD);
1649
1650 // Check if another thread created the array klass while we were waiting for the lock.
1651 if (array_klasses() == nullptr) {
1652 ObjArrayKlass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this, CHECK_NULL);
1653 // use 'release' to pair with lock-free load
1654 release_set_array_klasses(k);
1655 }
1656 }
1657
1658 // array_klasses() will always be set at this point
1659 ObjArrayKlass* ak = array_klasses();
1660 assert(ak != nullptr, "should be set");
1661 return ak->array_klass(n, THREAD);
1662 }
1663
1664 ArrayKlass* InstanceKlass::array_klass_or_null(int n) {
1665 // Need load-acquire for lock-free read
1666 ObjArrayKlass* oak = array_klasses_acquire();
1667 if (oak == nullptr) {
1668 return nullptr;
1669 } else {
1670 return oak->array_klass_or_null(n);
1671 }
1672 }
1673
1674 ArrayKlass* InstanceKlass::array_klass(TRAPS) {
1675 return array_klass(1, THREAD);
1676 }
1677
1678 ArrayKlass* InstanceKlass::array_klass_or_null() {
1679 return array_klass_or_null(1);
1680 }
1681
1682 static int call_class_initializer_counter = 0; // for debugging
1683
1684 Method* InstanceKlass::class_initializer() const {
1685 Method* clinit = find_method(
1686 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1687 if (clinit != nullptr && clinit->has_valid_initializer_flags()) {
1688 return clinit;
1689 }
1690 return nullptr;
1691 }
1692
1693 void InstanceKlass::call_class_initializer(TRAPS) {
1694 if (ReplayCompiles &&
1695 (ReplaySuppressInitializers == 1 ||
1696 (ReplaySuppressInitializers >= 2 && class_loader() != nullptr))) {
1697 // Hide the existence of the initializer for the purpose of replaying the compile
1698 return;
1699 }
1700
1701 #if INCLUDE_CDS
1702 // This is needed to ensure the consistency of the archived heap objects.
1703 if (has_aot_initialized_mirror() && CDSConfig::is_loading_heap()) {
1704 AOTClassInitializer::call_runtime_setup(THREAD, this);
1705 return;
1706 } else if (has_archived_enum_objs()) {
1707 assert(in_aot_cache(), "must be");
1708 bool initialized = CDSEnumKlass::initialize_enum_klass(this, CHECK);
1709 if (initialized) {
1710 return;
1711 }
1712 }
1713 #endif
1714
1715 methodHandle h_method(THREAD, class_initializer());
1716 assert(!is_initialized(), "we cannot initialize twice");
1717
1718 #if 0
1719 // FIXME -- revive this code added to leyden/premain for <clinit> profiling
1720 int init_id = log_class_init(THREAD, this);
1721 if (h_method() != nullptr) {
1722 JavaCallArguments args; // No arguments
1723 JavaValue result(T_VOID);
1724 InstanceKlass* outer = THREAD->set_class_being_initialized(this);
1725 jlong bc_start = (CountBytecodesPerThread ? THREAD->bc_counter_value() : BytecodeCounter::counter_value());
1726
1727 elapsedTimer timer;
1728 {
1729 PerfPauseTimer pt(THREAD->current_rt_call_timer(), THREAD->profile_rt_calls());
1730 PauseRuntimeCallProfiling prcp(THREAD, THREAD->profile_rt_calls());
1731
1732 timer.start();
1733 JavaCalls::call(&result, h_method, &args, THREAD); // Static call (no args)
1734 timer.stop();
1735 }
1736
1737 jlong bc_end = (CountBytecodesPerThread ? THREAD->bc_counter_value() : BytecodeCounter::counter_value());
1738
1739 jlong bc_executed = (bc_end - bc_start);
1740 if (UsePerfData && outer == nullptr) { // outermost clinit
1741 THREAD->inc_clinit_bc_counter_value(bc_executed);
1742 ClassLoader::perf_class_init_bytecodes_count()->inc(bc_executed);
1743 }
1744
1745 THREAD->set_class_being_initialized(outer);
1746
1747 LogStreamHandle(Debug, init) log;
1748 if (log.is_enabled()) {
1749 ResourceMark rm(THREAD);
1750 log.print("%d Initialized in %.3fms (total: " JLONG_FORMAT "ms); ",
1751 init_id, timer.seconds() * 1000.0, ClassLoader::class_init_time_ms());
1752 if (CountBytecodes || CountBytecodesPerThread) {
1753 log.print("executed " JLONG_FORMAT " bytecodes; ", bc_executed);
1754 }
1755 name()->print_value_on(&log);
1756 log.print_cr(" by thread " PTR_FORMAT " \"%s\" (" PTR_FORMAT ")",
1757 p2i(THREAD), THREAD->name(), p2i(this));
1758 }
1759 }
1760 LogTarget(Info, class, init) lt;
1761 if (lt.is_enabled()) {
1762 ResourceMark rm(THREAD);
1763 LogStream ls(lt);
1764 ls.print("%d Initialized ", init_id);
1765 name()->print_value_on(&ls);
1766 ls.print_cr("%s (" PTR_FORMAT ") by thread \"%s\"",
1767 h_method() == nullptr ? "(no method)" : "", p2i(this),
1768 THREAD->name());
1769 }
1770 #else
1771 LogTarget(Info, class, init) lt;
1772 if (lt.is_enabled()) {
1773 ResourceMark rm(THREAD);
1774 LogStream ls(lt);
1775 ls.print("%d Initializing ", call_class_initializer_counter++);
1776 name()->print_value_on(&ls);
1777 ls.print_cr("%s (" PTR_FORMAT ") by thread \"%s\"",
1778 h_method() == nullptr ? "(no method)" : "", p2i(this),
1779 THREAD->name());
1780 }
1781 if (h_method() != nullptr) {
1782 ThreadInClassInitializer ticl(THREAD, this); // Track class being initialized
1783 JavaCallArguments args; // No arguments
1784 JavaValue result(T_VOID);
1785 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1786 }
1787 #endif
1788 }
1789
1790 // If a class that implements this interface is initialized, is the JVM required
1791 // to first execute a <clinit> method declared in this interface,
1792 // or (if also_check_supers==true) any of the super types of this interface?
1793 //
1794 // JVMS 5.5. Initialization, step 7: Next, if C is a class rather than
1795 // an interface, then let SC be its superclass and let SI1, ..., SIn
1796 // be all superinterfaces of C (whether direct or indirect) that
1797 // declare at least one non-abstract, non-static method.
1798 //
1799 // So when an interface is initialized, it does not look at its
1800 // supers. But a proper class will ensure that all of its supers have
1801 // run their <clinit> methods, except that it disregards interfaces
1802 // that lack a non-static concrete method (i.e., a default method).
1803 // Therefore, you should probably call this method only when the
1804 // current class is a super of some proper class, not an interface.
1805 bool InstanceKlass::interface_needs_clinit_execution_as_super(bool also_check_supers) const {
1806 assert(is_interface(), "must be");
1807
1808 if (!has_nonstatic_concrete_methods()) {
1809 // quick check: no nonstatic concrete methods are declared by this or any super interfaces
1810 return false;
1811 }
1812
1813 // JVMS 5.5. Initialization
1814 // ...If C is an interface that declares a non-abstract,
1815 // non-static method, the initialization of a class that
1816 // implements C directly or indirectly.
1817 if (declares_nonstatic_concrete_methods() && class_initializer() != nullptr) {
1818 return true;
1819 }
1820 if (also_check_supers) {
1821 Array<InstanceKlass*>* all_ifs = transitive_interfaces();
1822 for (int i = 0; i < all_ifs->length(); ++i) {
1823 InstanceKlass* super_intf = all_ifs->at(i);
1824 if (super_intf->declares_nonstatic_concrete_methods() && super_intf->class_initializer() != nullptr) {
1825 return true;
1826 }
1827 }
1828 }
1829 return false;
1830 }
1831
1832 void InstanceKlass::mask_for(const methodHandle& method, int bci,
1833 InterpreterOopMap* entry_for) {
1834 // Lazily create the _oop_map_cache at first request.
1835 // Load_acquire is needed to safely get instance published with CAS by another thread.
1836 OopMapCache* oop_map_cache = Atomic::load_acquire(&_oop_map_cache);
1837 if (oop_map_cache == nullptr) {
1838 // Try to install new instance atomically.
1839 oop_map_cache = new OopMapCache();
1840 OopMapCache* other = Atomic::cmpxchg(&_oop_map_cache, (OopMapCache*)nullptr, oop_map_cache);
1841 if (other != nullptr) {
1842 // Someone else managed to install before us, ditch local copy and use the existing one.
1843 delete oop_map_cache;
1844 oop_map_cache = other;
1845 }
1846 }
1847 // _oop_map_cache is constant after init; lookup below does its own locking.
1848 oop_map_cache->lookup(method, bci, entry_for);
1849 }
1850
1851 bool InstanceKlass::contains_field_offset(int offset) {
1852 fieldDescriptor fd;
1853 return find_field_from_offset(offset, false, &fd);
1854 }
1855
1856 FieldInfo InstanceKlass::field(int index) const {
1857 for (AllFieldStream fs(this); !fs.done(); fs.next()) {
1858 if (fs.index() == index) {
1859 return fs.to_FieldInfo();
1860 }
1861 }
1862 fatal("Field not found");
1863 return FieldInfo();
1864 }
1865
1866 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1867 JavaFieldStream fs(this);
1868 if (fs.lookup(name, sig)) {
1869 assert(fs.name() == name, "name must match");
1870 assert(fs.signature() == sig, "signature must match");
1871 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.to_FieldInfo());
1872 return true;
1873 }
1874 return false;
1875 }
1876
1877
1878 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1879 const int n = local_interfaces()->length();
1880 for (int i = 0; i < n; i++) {
1881 InstanceKlass* intf1 = local_interfaces()->at(i);
1882 assert(intf1->is_interface(), "just checking type");
1883 // search for field in current interface
1884 if (intf1->find_local_field(name, sig, fd)) {
1885 assert(fd->is_static(), "interface field must be static");
1886 return intf1;
1887 }
1888 // search for field in direct superinterfaces
1889 Klass* intf2 = intf1->find_interface_field(name, sig, fd);
1890 if (intf2 != nullptr) return intf2;
1891 }
1892 // otherwise field lookup fails
1893 return nullptr;
1894 }
1895
1896
1897 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1898 // search order according to newest JVM spec (5.4.3.2, p.167).
1899 // 1) search for field in current klass
1900 if (find_local_field(name, sig, fd)) {
1901 return const_cast<InstanceKlass*>(this);
1902 }
1903 // 2) search for field recursively in direct superinterfaces
1904 { Klass* intf = find_interface_field(name, sig, fd);
1905 if (intf != nullptr) return intf;
1906 }
1907 // 3) apply field lookup recursively if superclass exists
1908 { InstanceKlass* supr = super();
1909 if (supr != nullptr) return supr->find_field(name, sig, fd);
1910 }
1911 // 4) otherwise field lookup fails
1912 return nullptr;
1913 }
1914
1915
1916 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
1917 // search order according to newest JVM spec (5.4.3.2, p.167).
1918 // 1) search for field in current klass
1919 if (find_local_field(name, sig, fd)) {
1920 if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
1921 }
1922 // 2) search for field recursively in direct superinterfaces
1923 if (is_static) {
1924 Klass* intf = find_interface_field(name, sig, fd);
1925 if (intf != nullptr) return intf;
1926 }
1927 // 3) apply field lookup recursively if superclass exists
1928 { InstanceKlass* supr = super();
1929 if (supr != nullptr) return supr->find_field(name, sig, is_static, fd);
1930 }
1931 // 4) otherwise field lookup fails
1932 return nullptr;
1933 }
1934
1935
1936 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1937 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1938 if (fs.offset() == offset) {
1939 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.to_FieldInfo());
1940 if (fd->is_static() == is_static) return true;
1941 }
1942 }
1943 return false;
1944 }
1945
1946
1947 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1948 const InstanceKlass* klass = this;
1949 while (klass != nullptr) {
1950 if (klass->find_local_field_from_offset(offset, is_static, fd)) {
1951 return true;
1952 }
1953 klass = klass->super();
1954 }
1955 return false;
1956 }
1957
1958
1959 void InstanceKlass::methods_do(void f(Method* method)) {
1960 // Methods aren't stable until they are loaded. This can be read outside
1961 // a lock through the ClassLoaderData for profiling
1962 // Redefined scratch classes are on the list and need to be cleaned
1963 if (!is_loaded() && !is_scratch_class()) {
1964 return;
1965 }
1966
1967 int len = methods()->length();
1968 for (int index = 0; index < len; index++) {
1969 Method* m = methods()->at(index);
1970 assert(m->is_method(), "must be method");
1971 f(m);
1972 }
1973 }
1974
1975
1976 void InstanceKlass::do_local_static_fields(FieldClosure* cl) {
1977 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1978 if (fs.access_flags().is_static()) {
1979 fieldDescriptor& fd = fs.field_descriptor();
1980 cl->do_field(&fd);
1981 }
1982 }
1983 }
1984
1985
1986 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) {
1987 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1988 if (fs.access_flags().is_static()) {
1989 fieldDescriptor& fd = fs.field_descriptor();
1990 f(&fd, mirror, CHECK);
1991 }
1992 }
1993 }
1994
1995 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) {
1996 InstanceKlass* super = this->super();
1997 if (super != nullptr) {
1998 super->do_nonstatic_fields(cl);
1999 }
2000 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
2001 fieldDescriptor& fd = fs.field_descriptor();
2002 if (!fd.is_static()) {
2003 cl->do_field(&fd);
2004 }
2005 }
2006 }
2007
2008 static int compare_fields_by_offset(FieldInfo* a, FieldInfo* b) {
2009 return a->offset() - b->offset();
2010 }
2011
2012 void InstanceKlass::print_nonstatic_fields(FieldClosure* cl) {
2013 InstanceKlass* super = this->super();
2014 if (super != nullptr) {
2015 super->print_nonstatic_fields(cl);
2016 }
2017 ResourceMark rm;
2018 // In DebugInfo nonstatic fields are sorted by offset.
2019 GrowableArray<FieldInfo> fields_sorted;
2020 for (AllFieldStream fs(this); !fs.done(); fs.next()) {
2021 if (!fs.access_flags().is_static()) {
2022 fields_sorted.push(fs.to_FieldInfo());
2023 }
2024 }
2025 int length = fields_sorted.length();
2026 if (length > 0) {
2027 fields_sorted.sort(compare_fields_by_offset);
2028 fieldDescriptor fd;
2029 for (int i = 0; i < length; i++) {
2030 fd.reinitialize(this, fields_sorted.at(i));
2031 assert(!fd.is_static() && fd.offset() == checked_cast<int>(fields_sorted.at(i).offset()), "only nonstatic fields");
2032 cl->do_field(&fd);
2033 }
2034 }
2035 }
2036
2037 #ifdef ASSERT
2038 static int linear_search(const Array<Method*>* methods,
2039 const Symbol* name,
2040 const Symbol* signature) {
2041 const int len = methods->length();
2042 for (int index = 0; index < len; index++) {
2043 const Method* const m = methods->at(index);
2044 assert(m->is_method(), "must be method");
2045 if (m->signature() == signature && m->name() == name) {
2046 return index;
2047 }
2048 }
2049 return -1;
2050 }
2051 #endif
2052
2053 bool InstanceKlass::_disable_method_binary_search = false;
2054
2055 NOINLINE int linear_search(const Array<Method*>* methods, const Symbol* name) {
2056 int len = methods->length();
2057 int l = 0;
2058 int h = len - 1;
2059 while (l <= h) {
2060 Method* m = methods->at(l);
2061 if (m->name() == name) {
2062 return l;
2063 }
2064 l++;
2065 }
2066 return -1;
2067 }
2068
2069 inline int InstanceKlass::quick_search(const Array<Method*>* methods, const Symbol* name) {
2070 if (_disable_method_binary_search) {
2071 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
2072 // At the final stage of dynamic dumping, the methods array may not be sorted
2073 // by ascending addresses of their names, so we can't use binary search anymore.
2074 // However, methods with the same name are still laid out consecutively inside the
2075 // methods array, so let's look for the first one that matches.
2076 return linear_search(methods, name);
2077 }
2078
2079 int len = methods->length();
2080 int l = 0;
2081 int h = len - 1;
2082
2083 // methods are sorted by ascending addresses of their names, so do binary search
2084 while (l <= h) {
2085 int mid = (l + h) >> 1;
2086 Method* m = methods->at(mid);
2087 assert(m->is_method(), "must be method");
2088 int res = m->name()->fast_compare(name);
2089 if (res == 0) {
2090 return mid;
2091 } else if (res < 0) {
2092 l = mid + 1;
2093 } else {
2094 h = mid - 1;
2095 }
2096 }
2097 return -1;
2098 }
2099
2100 // find_method looks up the name/signature in the local methods array
2101 Method* InstanceKlass::find_method(const Symbol* name,
2102 const Symbol* signature) const {
2103 return find_method_impl(name, signature,
2104 OverpassLookupMode::find,
2105 StaticLookupMode::find,
2106 PrivateLookupMode::find);
2107 }
2108
2109 Method* InstanceKlass::find_method_impl(const Symbol* name,
2110 const Symbol* signature,
2111 OverpassLookupMode overpass_mode,
2112 StaticLookupMode static_mode,
2113 PrivateLookupMode private_mode) const {
2114 return InstanceKlass::find_method_impl(methods(),
2115 name,
2116 signature,
2117 overpass_mode,
2118 static_mode,
2119 private_mode);
2120 }
2121
2122 // find_instance_method looks up the name/signature in the local methods array
2123 // and skips over static methods
2124 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods,
2125 const Symbol* name,
2126 const Symbol* signature,
2127 PrivateLookupMode private_mode) {
2128 Method* const meth = InstanceKlass::find_method_impl(methods,
2129 name,
2130 signature,
2131 OverpassLookupMode::find,
2132 StaticLookupMode::skip,
2133 private_mode);
2134 assert(((meth == nullptr) || !meth->is_static()),
2135 "find_instance_method should have skipped statics");
2136 return meth;
2137 }
2138
2139 // find_instance_method looks up the name/signature in the local methods array
2140 // and skips over static methods
2141 Method* InstanceKlass::find_instance_method(const Symbol* name,
2142 const Symbol* signature,
2143 PrivateLookupMode private_mode) const {
2144 return InstanceKlass::find_instance_method(methods(), name, signature, private_mode);
2145 }
2146
2147 // Find looks up the name/signature in the local methods array
2148 // and filters on the overpass, static and private flags
2149 // This returns the first one found
2150 // note that the local methods array can have up to one overpass, one static
2151 // and one instance (private or not) with the same name/signature
2152 Method* InstanceKlass::find_local_method(const Symbol* name,
2153 const Symbol* signature,
2154 OverpassLookupMode overpass_mode,
2155 StaticLookupMode static_mode,
2156 PrivateLookupMode private_mode) const {
2157 return InstanceKlass::find_method_impl(methods(),
2158 name,
2159 signature,
2160 overpass_mode,
2161 static_mode,
2162 private_mode);
2163 }
2164
2165 // Find looks up the name/signature in the local methods array
2166 // and filters on the overpass, static and private flags
2167 // This returns the first one found
2168 // note that the local methods array can have up to one overpass, one static
2169 // and one instance (private or not) with the same name/signature
2170 Method* InstanceKlass::find_local_method(const Array<Method*>* methods,
2171 const Symbol* name,
2172 const Symbol* signature,
2173 OverpassLookupMode overpass_mode,
2174 StaticLookupMode static_mode,
2175 PrivateLookupMode private_mode) {
2176 return InstanceKlass::find_method_impl(methods,
2177 name,
2178 signature,
2179 overpass_mode,
2180 static_mode,
2181 private_mode);
2182 }
2183
2184 Method* InstanceKlass::find_method(const Array<Method*>* methods,
2185 const Symbol* name,
2186 const Symbol* signature) {
2187 return InstanceKlass::find_method_impl(methods,
2188 name,
2189 signature,
2190 OverpassLookupMode::find,
2191 StaticLookupMode::find,
2192 PrivateLookupMode::find);
2193 }
2194
2195 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods,
2196 const Symbol* name,
2197 const Symbol* signature,
2198 OverpassLookupMode overpass_mode,
2199 StaticLookupMode static_mode,
2200 PrivateLookupMode private_mode) {
2201 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode);
2202 return hit >= 0 ? methods->at(hit): nullptr;
2203 }
2204
2205 // true if method matches signature and conforms to skipping_X conditions.
2206 static bool method_matches(const Method* m,
2207 const Symbol* signature,
2208 bool skipping_overpass,
2209 bool skipping_static,
2210 bool skipping_private) {
2211 return ((m->signature() == signature) &&
2212 (!skipping_overpass || !m->is_overpass()) &&
2213 (!skipping_static || !m->is_static()) &&
2214 (!skipping_private || !m->is_private()));
2215 }
2216
2217 // Used directly for default_methods to find the index into the
2218 // default_vtable_indices, and indirectly by find_method
2219 // find_method_index looks in the local methods array to return the index
2220 // of the matching name/signature. If, overpass methods are being ignored,
2221 // the search continues to find a potential non-overpass match. This capability
2222 // is important during method resolution to prefer a static method, for example,
2223 // over an overpass method.
2224 // There is the possibility in any _method's array to have the same name/signature
2225 // for a static method, an overpass method and a local instance method
2226 // To correctly catch a given method, the search criteria may need
2227 // to explicitly skip the other two. For local instance methods, it
2228 // is often necessary to skip private methods
2229 int InstanceKlass::find_method_index(const Array<Method*>* methods,
2230 const Symbol* name,
2231 const Symbol* signature,
2232 OverpassLookupMode overpass_mode,
2233 StaticLookupMode static_mode,
2234 PrivateLookupMode private_mode) {
2235 const bool skipping_overpass = (overpass_mode == OverpassLookupMode::skip);
2236 const bool skipping_static = (static_mode == StaticLookupMode::skip);
2237 const bool skipping_private = (private_mode == PrivateLookupMode::skip);
2238 const int hit = quick_search(methods, name);
2239 if (hit != -1) {
2240 const Method* const m = methods->at(hit);
2241
2242 // Do linear search to find matching signature. First, quick check
2243 // for common case, ignoring overpasses if requested.
2244 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
2245 return hit;
2246 }
2247
2248 // search downwards through overloaded methods
2249 int i;
2250 for (i = hit - 1; i >= 0; --i) {
2251 const Method* const m = methods->at(i);
2252 assert(m->is_method(), "must be method");
2253 if (m->name() != name) {
2254 break;
2255 }
2256 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
2257 return i;
2258 }
2259 }
2260 // search upwards
2261 for (i = hit + 1; i < methods->length(); ++i) {
2262 const Method* const m = methods->at(i);
2263 assert(m->is_method(), "must be method");
2264 if (m->name() != name) {
2265 break;
2266 }
2267 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
2268 return i;
2269 }
2270 }
2271 // not found
2272 #ifdef ASSERT
2273 const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 :
2274 linear_search(methods, name, signature);
2275 assert(-1 == index, "binary search should have found entry %d", index);
2276 #endif
2277 }
2278 return -1;
2279 }
2280
2281 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const {
2282 return find_method_by_name(methods(), name, end);
2283 }
2284
2285 int InstanceKlass::find_method_by_name(const Array<Method*>* methods,
2286 const Symbol* name,
2287 int* end_ptr) {
2288 assert(end_ptr != nullptr, "just checking");
2289 int start = quick_search(methods, name);
2290 int end = start + 1;
2291 if (start != -1) {
2292 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
2293 while (end < methods->length() && (methods->at(end))->name() == name) ++end;
2294 *end_ptr = end;
2295 return start;
2296 }
2297 return -1;
2298 }
2299
2300 // uncached_lookup_method searches both the local class methods array and all
2301 // superclasses methods arrays, skipping any overpass methods in superclasses,
2302 // and possibly skipping private methods.
2303 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
2304 const Symbol* signature,
2305 OverpassLookupMode overpass_mode,
2306 PrivateLookupMode private_mode) const {
2307 OverpassLookupMode overpass_local_mode = overpass_mode;
2308 const InstanceKlass* klass = this;
2309 while (klass != nullptr) {
2310 Method* const method = klass->find_method_impl(name,
2311 signature,
2312 overpass_local_mode,
2313 StaticLookupMode::find,
2314 private_mode);
2315 if (method != nullptr) {
2316 return method;
2317 }
2318 klass = klass->super();
2319 overpass_local_mode = OverpassLookupMode::skip; // Always ignore overpass methods in superclasses
2320 }
2321 return nullptr;
2322 }
2323
2324 #ifdef ASSERT
2325 // search through class hierarchy and return true if this class or
2326 // one of the superclasses was redefined
2327 bool InstanceKlass::has_redefined_this_or_super() const {
2328 const InstanceKlass* klass = this;
2329 while (klass != nullptr) {
2330 if (klass->has_been_redefined()) {
2331 return true;
2332 }
2333 klass = klass->super();
2334 }
2335 return false;
2336 }
2337 #endif
2338
2339 // lookup a method in the default methods list then in all transitive interfaces
2340 // Do NOT return private or static methods
2341 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
2342 Symbol* signature) const {
2343 Method* m = nullptr;
2344 if (default_methods() != nullptr) {
2345 m = find_method(default_methods(), name, signature);
2346 }
2347 // Look up interfaces
2348 if (m == nullptr) {
2349 m = lookup_method_in_all_interfaces(name, signature, DefaultsLookupMode::find);
2350 }
2351 return m;
2352 }
2353
2354 // lookup a method in all the interfaces that this class implements
2355 // Do NOT return private or static methods, new in JDK8 which are not externally visible
2356 // They should only be found in the initial InterfaceMethodRef
2357 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
2358 Symbol* signature,
2359 DefaultsLookupMode defaults_mode) const {
2360 Array<InstanceKlass*>* all_ifs = transitive_interfaces();
2361 int num_ifs = all_ifs->length();
2362 InstanceKlass *ik = nullptr;
2363 for (int i = 0; i < num_ifs; i++) {
2364 ik = all_ifs->at(i);
2365 Method* m = ik->lookup_method(name, signature);
2366 if (m != nullptr && m->is_public() && !m->is_static() &&
2367 ((defaults_mode != DefaultsLookupMode::skip) || !m->is_default_method())) {
2368 return m;
2369 }
2370 }
2371 return nullptr;
2372 }
2373
2374 PrintClassClosure::PrintClassClosure(outputStream* st, bool verbose)
2375 :_st(st), _verbose(verbose) {
2376 ResourceMark rm;
2377 _st->print("%-18s ", "KlassAddr");
2378 _st->print("%-4s ", "Size");
2379 _st->print("%-20s ", "State");
2380 _st->print("%-7s ", "Flags");
2381 _st->print("%-5s ", "ClassName");
2382 _st->cr();
2383 }
2384
2385 void PrintClassClosure::do_klass(Klass* k) {
2386 ResourceMark rm;
2387 // klass pointer
2388 _st->print(PTR_FORMAT " ", p2i(k));
2389 // klass size
2390 _st->print("%4d ", k->size());
2391 // initialization state
2392 if (k->is_instance_klass()) {
2393 _st->print("%-20s ",InstanceKlass::cast(k)->init_state_name());
2394 } else {
2395 _st->print("%-20s ","");
2396 }
2397 // misc flags(Changes should synced with ClassesDCmd::ClassesDCmd help doc)
2398 char buf[10];
2399 int i = 0;
2400 if (k->has_finalizer()) buf[i++] = 'F';
2401 if (k->is_instance_klass()) {
2402 InstanceKlass* ik = InstanceKlass::cast(k);
2403 if (ik->has_final_method()) buf[i++] = 'f';
2404 if (ik->is_rewritten()) buf[i++] = 'W';
2405 if (ik->is_contended()) buf[i++] = 'C';
2406 if (ik->has_been_redefined()) buf[i++] = 'R';
2407 if (ik->in_aot_cache()) buf[i++] = 'S';
2408 }
2409 buf[i++] = '\0';
2410 _st->print("%-7s ", buf);
2411 // klass name
2412 _st->print("%-5s ", k->external_name());
2413 // end
2414 _st->cr();
2415 if (_verbose) {
2416 k->print_on(_st);
2417 }
2418 }
2419
2420 /* jni_id_for for jfieldIds only */
2421 JNIid* InstanceKlass::jni_id_for(int offset) {
2422 MutexLocker ml(JfieldIdCreation_lock);
2423 JNIid* probe = jni_ids() == nullptr ? nullptr : jni_ids()->find(offset);
2424 if (probe == nullptr) {
2425 // Allocate new static field identifier
2426 probe = new JNIid(this, offset, jni_ids());
2427 set_jni_ids(probe);
2428 }
2429 return probe;
2430 }
2431
2432 u2 InstanceKlass::enclosing_method_data(int offset) const {
2433 const Array<jushort>* const inner_class_list = inner_classes();
2434 if (inner_class_list == nullptr) {
2435 return 0;
2436 }
2437 const int length = inner_class_list->length();
2438 if (length % inner_class_next_offset == 0) {
2439 return 0;
2440 }
2441 const int index = length - enclosing_method_attribute_size;
2442 assert(offset < enclosing_method_attribute_size, "invalid offset");
2443 return inner_class_list->at(index + offset);
2444 }
2445
2446 void InstanceKlass::set_enclosing_method_indices(u2 class_index,
2447 u2 method_index) {
2448 Array<jushort>* inner_class_list = inner_classes();
2449 assert (inner_class_list != nullptr, "_inner_classes list is not set up");
2450 int length = inner_class_list->length();
2451 if (length % inner_class_next_offset == enclosing_method_attribute_size) {
2452 int index = length - enclosing_method_attribute_size;
2453 inner_class_list->at_put(
2454 index + enclosing_method_class_index_offset, class_index);
2455 inner_class_list->at_put(
2456 index + enclosing_method_method_index_offset, method_index);
2457 }
2458 }
2459
2460 jmethodID InstanceKlass::update_jmethod_id(jmethodID* jmeths, Method* method, int idnum) {
2461 if (method->is_old() && !method->is_obsolete()) {
2462 // If the method passed in is old (but not obsolete), use the current version.
2463 method = method_with_idnum((int)idnum);
2464 assert(method != nullptr, "old and but not obsolete, so should exist");
2465 }
2466 jmethodID new_id = Method::make_jmethod_id(class_loader_data(), method);
2467 Atomic::release_store(&jmeths[idnum + 1], new_id);
2468 return new_id;
2469 }
2470
2471 // Allocate the jmethodID cache.
2472 static jmethodID* create_jmethod_id_cache(size_t size) {
2473 jmethodID* jmeths = NEW_C_HEAP_ARRAY(jmethodID, size + 1, mtClass);
2474 memset(jmeths, 0, (size + 1) * sizeof(jmethodID));
2475 // cache size is stored in element[0], other elements offset by one
2476 jmeths[0] = (jmethodID)size;
2477 return jmeths;
2478 }
2479
2480 // When reading outside a lock, use this.
2481 jmethodID* InstanceKlass::methods_jmethod_ids_acquire() const {
2482 return Atomic::load_acquire(&_methods_jmethod_ids);
2483 }
2484
2485 void InstanceKlass::release_set_methods_jmethod_ids(jmethodID* jmeths) {
2486 Atomic::release_store(&_methods_jmethod_ids, jmeths);
2487 }
2488
2489 // Lookup or create a jmethodID.
2490 jmethodID InstanceKlass::get_jmethod_id(Method* method) {
2491 int idnum = method->method_idnum();
2492 jmethodID* jmeths = methods_jmethod_ids_acquire();
2493
2494 // We use a double-check locking idiom here because this cache is
2495 // performance sensitive. In the normal system, this cache only
2496 // transitions from null to non-null which is safe because we use
2497 // release_set_methods_jmethod_ids() to advertise the new cache.
2498 // A partially constructed cache should never be seen by a racing
2499 // thread. We also use release_store() to save a new jmethodID
2500 // in the cache so a partially constructed jmethodID should never be
2501 // seen either. Cache reads of existing jmethodIDs proceed without a
2502 // lock, but cache writes of a new jmethodID requires uniqueness and
2503 // creation of the cache itself requires no leaks so a lock is
2504 // acquired in those two cases.
2505 //
2506 // If the RedefineClasses() API has been used, then this cache grows
2507 // in the redefinition safepoint.
2508
2509 if (jmeths == nullptr) {
2510 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2511 jmeths = _methods_jmethod_ids;
2512 // Still null?
2513 if (jmeths == nullptr) {
2514 size_t size = idnum_allocated_count();
2515 assert(size > (size_t)idnum, "should already have space");
2516 jmeths = create_jmethod_id_cache(size);
2517 jmethodID new_id = update_jmethod_id(jmeths, method, idnum);
2518
2519 // publish jmeths
2520 release_set_methods_jmethod_ids(jmeths);
2521 return new_id;
2522 }
2523 }
2524
2525 jmethodID id = Atomic::load_acquire(&jmeths[idnum + 1]);
2526 if (id == nullptr) {
2527 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2528 id = jmeths[idnum + 1];
2529 // Still null?
2530 if (id == nullptr) {
2531 return update_jmethod_id(jmeths, method, idnum);
2532 }
2533 }
2534 return id;
2535 }
2536
2537 void InstanceKlass::update_methods_jmethod_cache() {
2538 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
2539 jmethodID* cache = _methods_jmethod_ids;
2540 if (cache != nullptr) {
2541 size_t size = idnum_allocated_count();
2542 size_t old_size = (size_t)cache[0];
2543 if (old_size < size + 1) {
2544 // Allocate a larger one and copy entries to the new one.
2545 // They've already been updated to point to new methods where applicable (i.e., not obsolete).
2546 jmethodID* new_cache = create_jmethod_id_cache(size);
2547
2548 for (int i = 1; i <= (int)old_size; i++) {
2549 new_cache[i] = cache[i];
2550 }
2551 _methods_jmethod_ids = new_cache;
2552 FREE_C_HEAP_ARRAY(jmethodID, cache);
2553 }
2554 }
2555 }
2556
2557 // Make a jmethodID for all methods in this class. This makes getting all method
2558 // ids much, much faster with classes with more than 8
2559 // methods, and has a *substantial* effect on performance with jvmti
2560 // code that loads all jmethodIDs for all classes.
2561 void InstanceKlass::make_methods_jmethod_ids() {
2562 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2563 jmethodID* jmeths = _methods_jmethod_ids;
2564 if (jmeths == nullptr) {
2565 jmeths = create_jmethod_id_cache(idnum_allocated_count());
2566 release_set_methods_jmethod_ids(jmeths);
2567 }
2568
2569 int length = methods()->length();
2570 for (int index = 0; index < length; index++) {
2571 Method* m = methods()->at(index);
2572 int idnum = m->method_idnum();
2573 assert(!m->is_old(), "should not have old methods or I'm confused");
2574 jmethodID id = Atomic::load_acquire(&jmeths[idnum + 1]);
2575 if (!m->is_overpass() && // skip overpasses
2576 id == nullptr) {
2577 id = Method::make_jmethod_id(class_loader_data(), m);
2578 Atomic::release_store(&jmeths[idnum + 1], id);
2579 }
2580 }
2581 }
2582
2583 // Lookup a jmethodID, null if not found. Do no blocking, no allocations, no handles
2584 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
2585 int idnum = method->method_idnum();
2586 jmethodID* jmeths = methods_jmethod_ids_acquire();
2587 return (jmeths != nullptr) ? jmeths[idnum + 1] : nullptr;
2588 }
2589
2590 inline DependencyContext InstanceKlass::dependencies() {
2591 DependencyContext dep_context(&_dep_context, &_dep_context_last_cleaned);
2592 return dep_context;
2593 }
2594
2595 void InstanceKlass::mark_dependent_nmethods(DeoptimizationScope* deopt_scope, KlassDepChange& changes) {
2596 dependencies().mark_dependent_nmethods(deopt_scope, changes, this);
2597 }
2598
2599 void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
2600 assert_lock_strong(CodeCache_lock);
2601 dependencies().add_dependent_nmethod(nm);
2602 }
2603
2604 void InstanceKlass::clean_dependency_context() {
2605 dependencies().clean_unloading_dependents();
2606 }
2607
2608 #ifndef PRODUCT
2609 void InstanceKlass::print_dependent_nmethods(bool verbose) {
2610 dependencies().print_dependent_nmethods(verbose);
2611 }
2612
2613 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
2614 return dependencies().is_dependent_nmethod(nm);
2615 }
2616 #endif //PRODUCT
2617
2618 void InstanceKlass::clean_weak_instanceklass_links() {
2619 clean_implementors_list();
2620 clean_method_data();
2621 }
2622
2623 void InstanceKlass::clean_implementors_list() {
2624 assert(is_loader_alive(), "this klass should be live");
2625 if (is_interface()) {
2626 assert (ClassUnloading, "only called for ClassUnloading");
2627 for (;;) {
2628 // Use load_acquire due to competing with inserts
2629 InstanceKlass* volatile* iklass = adr_implementor();
2630 assert(iklass != nullptr, "Klass must not be null");
2631 InstanceKlass* impl = Atomic::load_acquire(iklass);
2632 if (impl != nullptr && !impl->is_loader_alive()) {
2633 // null this field, might be an unloaded instance klass or null
2634 if (Atomic::cmpxchg(iklass, impl, (InstanceKlass*)nullptr) == impl) {
2635 // Successfully unlinking implementor.
2636 if (log_is_enabled(Trace, class, unload)) {
2637 ResourceMark rm;
2638 log_trace(class, unload)("unlinking class (implementor): %s", impl->external_name());
2639 }
2640 return;
2641 }
2642 } else {
2643 return;
2644 }
2645 }
2646 }
2647 }
2648
2649 void InstanceKlass::clean_method_data() {
2650 for (int m = 0; m < methods()->length(); m++) {
2651 MethodData* mdo = methods()->at(m)->method_data();
2652 if (mdo != nullptr) {
2653 mdo->clean_method_data(/*always_clean*/false);
2654 }
2655 }
2656 }
2657
2658 void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) {
2659 Klass::metaspace_pointers_do(it);
2660
2661 if (log_is_enabled(Trace, aot)) {
2662 ResourceMark rm;
2663 log_trace(aot)("Iter(InstanceKlass): %p (%s)", this, external_name());
2664 }
2665
2666 it->push(&_annotations);
2667 it->push((Klass**)&_array_klasses);
2668 if (!is_rewritten()) {
2669 it->push(&_constants, MetaspaceClosure::_writable);
2670 } else {
2671 it->push(&_constants);
2672 }
2673 it->push(&_inner_classes);
2674 #if INCLUDE_JVMTI
2675 it->push(&_previous_versions);
2676 #endif
2677 #if INCLUDE_CDS
2678 // For "old" classes with methods containing the jsr bytecode, the _methods array will
2679 // be rewritten during runtime (see Rewriter::rewrite_jsrs()) but they cannot be safely
2680 // checked here with ByteCodeStream. All methods that can't be verified are made writable.
2681 // The length check on the _methods is necessary because classes which don't have any
2682 // methods share the Universe::_the_empty_method_array which is in the RO region.
2683 if (_methods != nullptr && _methods->length() > 0 && !can_be_verified_at_dumptime()) {
2684 // To handle jsr bytecode, new Method* maybe stored into _methods
2685 it->push(&_methods, MetaspaceClosure::_writable);
2686 } else {
2687 #endif
2688 it->push(&_methods);
2689 #if INCLUDE_CDS
2690 }
2691 #endif
2692 it->push(&_default_methods);
2693 it->push(&_local_interfaces);
2694 it->push(&_transitive_interfaces);
2695 it->push(&_method_ordering);
2696 if (!is_rewritten()) {
2697 it->push(&_default_vtable_indices, MetaspaceClosure::_writable);
2698 } else {
2699 it->push(&_default_vtable_indices);
2700 }
2701
2702 it->push(&_fieldinfo_stream);
2703 it->push(&_fieldinfo_search_table);
2704 // _fields_status might be written into by Rewriter::scan_method() -> fd.set_has_initialized_final_update()
2705 it->push(&_fields_status, MetaspaceClosure::_writable);
2706
2707 if (itable_length() > 0) {
2708 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2709 int method_table_offset_in_words = ioe->offset()/wordSize;
2710 int itable_offset_in_words = (int)(start_of_itable() - (intptr_t*)this);
2711
2712 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words)
2713 / itableOffsetEntry::size();
2714
2715 for (int i = 0; i < nof_interfaces; i ++, ioe ++) {
2716 if (ioe->interface_klass() != nullptr) {
2717 it->push(ioe->interface_klass_addr());
2718 itableMethodEntry* ime = ioe->first_method_entry(this);
2719 int n = klassItable::method_count_for_interface(ioe->interface_klass());
2720 for (int index = 0; index < n; index ++) {
2721 it->push(ime[index].method_addr());
2722 }
2723 }
2724 }
2725 }
2726
2727 it->push(&_nest_host);
2728 it->push(&_nest_members);
2729 it->push(&_permitted_subclasses);
2730 it->push(&_record_components);
2731 }
2732
2733 #if INCLUDE_CDS
2734 void InstanceKlass::remove_unshareable_info() {
2735 if (is_linked()) {
2736 assert(can_be_verified_at_dumptime(), "must be");
2737 // Remember this so we can avoid walking the hierarchy at runtime.
2738 set_verified_at_dump_time();
2739 }
2740 _misc_flags.set_has_init_deps_processed(false);
2741
2742 _misc_flags.set_has_init_deps_processed(false);
2743
2744 Klass::remove_unshareable_info();
2745
2746 if (SystemDictionaryShared::has_class_failed_verification(this)) {
2747 // Classes are attempted to link during dumping and may fail,
2748 // but these classes are still in the dictionary and class list in CLD.
2749 // If the class has failed verification, there is nothing else to remove.
2750 return;
2751 }
2752
2753 // Reset to the 'allocated' state to prevent any premature accessing to
2754 // a shared class at runtime while the class is still being loaded and
2755 // restored. A class' init_state is set to 'loaded' at runtime when it's
2756 // being added to class hierarchy (see InstanceKlass:::add_to_hierarchy()).
2757 _init_state = allocated;
2758
2759 { // Otherwise this needs to take out the Compile_lock.
2760 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
2761 init_implementor();
2762 }
2763
2764 // Call remove_unshareable_info() on other objects that belong to this class, except
2765 // for constants()->remove_unshareable_info(), which is called in a separate pass in
2766 // ArchiveBuilder::make_klasses_shareable(),
2767
2768 for (int i = 0; i < methods()->length(); i++) {
2769 Method* m = methods()->at(i);
2770 m->remove_unshareable_info();
2771 }
2772
2773 // do array classes also.
2774 if (array_klasses() != nullptr) {
2775 array_klasses()->remove_unshareable_info();
2776 }
2777
2778 // These are not allocated from metaspace. They are safe to set to null.
2779 _source_debug_extension = nullptr;
2780 _dep_context = nullptr;
2781 _osr_nmethods_head = nullptr;
2782 #if INCLUDE_JVMTI
2783 _breakpoints = nullptr;
2784 _previous_versions = nullptr;
2785 _cached_class_file = nullptr;
2786 _jvmti_cached_class_field_map = nullptr;
2787 #endif
2788
2789 _init_thread = nullptr;
2790 _methods_jmethod_ids = nullptr;
2791 _jni_ids = nullptr;
2792 _oop_map_cache = nullptr;
2793 if (CDSConfig::is_dumping_method_handles() && HeapShared::is_lambda_proxy_klass(this)) {
2794 // keep _nest_host
2795 } else {
2796 // clear _nest_host to ensure re-load at runtime
2797 _nest_host = nullptr;
2798 }
2799 init_shared_package_entry();
2800 _dep_context_last_cleaned = 0;
2801 DEBUG_ONLY(_shared_class_load_count = 0);
2802
2803 remove_unshareable_flags();
2804
2805 DEBUG_ONLY(FieldInfoStream::validate_search_table(_constants, _fieldinfo_stream, _fieldinfo_search_table));
2806 }
2807
2808 void InstanceKlass::remove_unshareable_flags() {
2809 // clear all the flags/stats that shouldn't be in the archived version
2810 assert(!is_scratch_class(), "must be");
2811 assert(!has_been_redefined(), "must be");
2812 #if INCLUDE_JVMTI
2813 set_is_being_redefined(false);
2814 #endif
2815 set_has_resolved_methods(false);
2816 }
2817
2818 void InstanceKlass::remove_java_mirror() {
2819 Klass::remove_java_mirror();
2820
2821 // do array classes also.
2822 if (array_klasses() != nullptr) {
2823 array_klasses()->remove_java_mirror();
2824 }
2825 }
2826
2827 void InstanceKlass::init_shared_package_entry() {
2828 assert(CDSConfig::is_dumping_archive(), "must be");
2829 #if !INCLUDE_CDS_JAVA_HEAP
2830 _package_entry = nullptr;
2831 #else
2832 if (CDSConfig::is_dumping_full_module_graph()) {
2833 if (defined_by_other_loaders()) {
2834 _package_entry = nullptr;
2835 } else {
2836 _package_entry = PackageEntry::get_archived_entry(_package_entry);
2837 }
2838 } else if (CDSConfig::is_dumping_dynamic_archive() &&
2839 CDSConfig::is_using_full_module_graph() &&
2840 AOTMetaspace::in_aot_cache(_package_entry)) {
2841 // _package_entry is an archived package in the base archive. Leave it as is.
2842 } else {
2843 _package_entry = nullptr;
2844 }
2845 ArchivePtrMarker::mark_pointer((address**)&_package_entry);
2846 #endif
2847 }
2848
2849 void InstanceKlass::compute_has_loops_flag_for_methods() {
2850 Array<Method*>* methods = this->methods();
2851 for (int index = 0; index < methods->length(); ++index) {
2852 Method* m = methods->at(index);
2853 if (!m->is_overpass()) { // work around JDK-8305771
2854 m->compute_has_loops_flag();
2855 }
2856 }
2857 }
2858
2859 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain,
2860 PackageEntry* pkg_entry, TRAPS) {
2861 // InstanceKlass::add_to_hierarchy() sets the init_state to loaded
2862 // before the InstanceKlass is added to the SystemDictionary. Make
2863 // sure the current state is <loaded.
2864 assert(!is_loaded(), "invalid init state");
2865 assert(!shared_loading_failed(), "Must not try to load failed class again");
2866 set_package(loader_data, pkg_entry, CHECK);
2867 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
2868
2869 Array<Method*>* methods = this->methods();
2870 int num_methods = methods->length();
2871 for (int index = 0; index < num_methods; ++index) {
2872 methods->at(index)->restore_unshareable_info(CHECK);
2873 }
2874 #if INCLUDE_JVMTI
2875 if (JvmtiExport::has_redefined_a_class()) {
2876 // Reinitialize vtable because RedefineClasses may have changed some
2877 // entries in this vtable for super classes so the CDS vtable might
2878 // point to old or obsolete entries. RedefineClasses doesn't fix up
2879 // vtables in the shared system dictionary, only the main one.
2880 // It also redefines the itable too so fix that too.
2881 // First fix any default methods that point to a super class that may
2882 // have been redefined.
2883 bool trace_name_printed = false;
2884 adjust_default_methods(&trace_name_printed);
2885 if (verified_at_dump_time()) {
2886 // Initialize vtable and itable for classes which can be verified at dump time.
2887 // Unlinked classes such as old classes with major version < 50 cannot be verified
2888 // at dump time.
2889 vtable().initialize_vtable();
2890 itable().initialize_itable();
2891 }
2892 }
2893 #endif // INCLUDE_JVMTI
2894
2895 // restore constant pool resolved references
2896 constants()->restore_unshareable_info(CHECK);
2897
2898 if (array_klasses() != nullptr) {
2899 // To get a consistent list of classes we need MultiArray_lock to ensure
2900 // array classes aren't observed while they are being restored.
2901 RecursiveLocker rl(MultiArray_lock, THREAD);
2902 assert(this == array_klasses()->bottom_klass(), "sanity");
2903 // Array classes have null protection domain.
2904 // --> see ArrayKlass::complete_create_array_klass()
2905 array_klasses()->restore_unshareable_info(class_loader_data(), Handle(), CHECK);
2906 }
2907
2908 // Initialize @ValueBased class annotation if not already set in the archived klass.
2909 if (DiagnoseSyncOnValueBasedClasses && has_value_based_class_annotation() && !is_value_based()) {
2910 set_is_value_based();
2911 }
2912
2913 DEBUG_ONLY(FieldInfoStream::validate_search_table(_constants, _fieldinfo_stream, _fieldinfo_search_table));
2914 }
2915
2916 bool InstanceKlass::can_be_verified_at_dumptime() const {
2917 if (CDSConfig::preserve_all_dumptime_verification_states(this)) {
2918 return true;
2919 }
2920
2921 if (AOTMetaspace::in_aot_cache(this)) {
2922 // This is a class that was dumped into the base archive, so we know
2923 // it was verified at dump time.
2924 return true;
2925 }
2926
2927 // Check if a class or any of its supertypes has a version older than 50.
2928 // CDS will not perform verification of old classes during dump time because
2929 // without changing the old verifier, the verification constraint cannot be
2930 // retrieved during dump time.
2931 // Verification of archived old classes will be performed during run time.
2932 if (major_version() < 50 /*JAVA_6_VERSION*/) {
2933 return false;
2934 }
2935 if (super() != nullptr && !super()->can_be_verified_at_dumptime()) {
2936 return false;
2937 }
2938 Array<InstanceKlass*>* interfaces = local_interfaces();
2939 int len = interfaces->length();
2940 for (int i = 0; i < len; i++) {
2941 if (!interfaces->at(i)->can_be_verified_at_dumptime()) {
2942 return false;
2943 }
2944 }
2945 return true;
2946 }
2947
2948 #endif // INCLUDE_CDS
2949
2950 #if INCLUDE_JVMTI
2951 static void clear_all_breakpoints(Method* m) {
2952 m->clear_all_breakpoints();
2953 }
2954 #endif
2955
2956 void InstanceKlass::unload_class(InstanceKlass* ik) {
2957
2958 if (ik->is_scratch_class()) {
2959 assert(ik->dependencies().is_empty(), "dependencies should be empty for scratch classes");
2960 return;
2961 }
2962 assert(ik->is_loaded(), "class should be loaded " PTR_FORMAT, p2i(ik));
2963
2964 // Release dependencies.
2965 ik->dependencies().remove_all_dependents();
2966
2967 // notify the debugger
2968 if (JvmtiExport::should_post_class_unload()) {
2969 JvmtiExport::post_class_unload(ik);
2970 }
2971
2972 // notify ClassLoadingService of class unload
2973 ClassLoadingService::notify_class_unloaded(ik);
2974
2975 SystemDictionaryShared::handle_class_unloading(ik);
2976
2977 if (log_is_enabled(Info, class, unload)) {
2978 ResourceMark rm;
2979 log_info(class, unload)("unloading class %s " PTR_FORMAT, ik->external_name(), p2i(ik));
2980 }
2981
2982 Events::log_class_unloading(Thread::current(), ik);
2983
2984 #if INCLUDE_JFR
2985 assert(ik != nullptr, "invariant");
2986 EventClassUnload event;
2987 event.set_unloadedClass(ik);
2988 event.set_definingClassLoader(ik->class_loader_data());
2989 event.commit();
2990 #endif
2991 }
2992
2993 static void method_release_C_heap_structures(Method* m) {
2994 m->release_C_heap_structures();
2995 }
2996
2997 // Called also by InstanceKlass::deallocate_contents, with false for release_sub_metadata.
2998 void InstanceKlass::release_C_heap_structures(bool release_sub_metadata) {
2999 // Clean up C heap
3000 Klass::release_C_heap_structures();
3001
3002 // Deallocate and call destructors for MDO mutexes
3003 if (release_sub_metadata) {
3004 methods_do(method_release_C_heap_structures);
3005 }
3006
3007 // Deallocate oop map cache
3008 if (_oop_map_cache != nullptr) {
3009 delete _oop_map_cache;
3010 _oop_map_cache = nullptr;
3011 }
3012
3013 // Deallocate JNI identifiers for jfieldIDs
3014 JNIid::deallocate(jni_ids());
3015 set_jni_ids(nullptr);
3016
3017 jmethodID* jmeths = _methods_jmethod_ids;
3018 if (jmeths != nullptr) {
3019 release_set_methods_jmethod_ids(nullptr);
3020 FreeHeap(jmeths);
3021 }
3022
3023 assert(_dep_context == nullptr,
3024 "dependencies should already be cleaned");
3025
3026 #if INCLUDE_JVMTI
3027 // Deallocate breakpoint records
3028 if (breakpoints() != nullptr) {
3029 methods_do(clear_all_breakpoints);
3030 assert(breakpoints() == nullptr, "should have cleared breakpoints");
3031 }
3032
3033 // deallocate the cached class file
3034 if (_cached_class_file != nullptr) {
3035 os::free(_cached_class_file);
3036 _cached_class_file = nullptr;
3037 }
3038 #endif
3039
3040 FREE_C_HEAP_ARRAY(char, _source_debug_extension);
3041
3042 if (release_sub_metadata) {
3043 constants()->release_C_heap_structures();
3044 }
3045 }
3046
3047 // The constant pool is on stack if any of the methods are executing or
3048 // referenced by handles.
3049 bool InstanceKlass::on_stack() const {
3050 return _constants->on_stack();
3051 }
3052
3053 Symbol* InstanceKlass::source_file_name() const { return _constants->source_file_name(); }
3054 u2 InstanceKlass::source_file_name_index() const { return _constants->source_file_name_index(); }
3055 void InstanceKlass::set_source_file_name_index(u2 sourcefile_index) { _constants->set_source_file_name_index(sourcefile_index); }
3056
3057 // minor and major version numbers of class file
3058 u2 InstanceKlass::minor_version() const { return _constants->minor_version(); }
3059 void InstanceKlass::set_minor_version(u2 minor_version) { _constants->set_minor_version(minor_version); }
3060 u2 InstanceKlass::major_version() const { return _constants->major_version(); }
3061 void InstanceKlass::set_major_version(u2 major_version) { _constants->set_major_version(major_version); }
3062
3063 const InstanceKlass* InstanceKlass::get_klass_version(int version) const {
3064 for (const InstanceKlass* ik = this; ik != nullptr; ik = ik->previous_versions()) {
3065 if (ik->constants()->version() == version) {
3066 return ik;
3067 }
3068 }
3069 return nullptr;
3070 }
3071
3072 void InstanceKlass::set_source_debug_extension(const char* array, int length) {
3073 if (array == nullptr) {
3074 _source_debug_extension = nullptr;
3075 } else {
3076 // Adding one to the attribute length in order to store a null terminator
3077 // character could cause an overflow because the attribute length is
3078 // already coded with an u4 in the classfile, but in practice, it's
3079 // unlikely to happen.
3080 assert((length+1) > length, "Overflow checking");
3081 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
3082 for (int i = 0; i < length; i++) {
3083 sde[i] = array[i];
3084 }
3085 sde[length] = '\0';
3086 _source_debug_extension = sde;
3087 }
3088 }
3089
3090 Symbol* InstanceKlass::generic_signature() const { return _constants->generic_signature(); }
3091 u2 InstanceKlass::generic_signature_index() const { return _constants->generic_signature_index(); }
3092 void InstanceKlass::set_generic_signature_index(u2 sig_index) { _constants->set_generic_signature_index(sig_index); }
3093
3094 const char* InstanceKlass::signature_name() const {
3095
3096 // Get the internal name as a c string
3097 const char* src = (const char*) (name()->as_C_string());
3098 const int src_length = (int)strlen(src);
3099
3100 char* dest = NEW_RESOURCE_ARRAY(char, src_length + 3);
3101
3102 // Add L as type indicator
3103 int dest_index = 0;
3104 dest[dest_index++] = JVM_SIGNATURE_CLASS;
3105
3106 // Add the actual class name
3107 for (int src_index = 0; src_index < src_length; ) {
3108 dest[dest_index++] = src[src_index++];
3109 }
3110
3111 if (is_hidden()) { // Replace the last '+' with a '.'.
3112 for (int index = (int)src_length; index > 0; index--) {
3113 if (dest[index] == '+') {
3114 dest[index] = JVM_SIGNATURE_DOT;
3115 break;
3116 }
3117 }
3118 }
3119
3120 // Add the semicolon and the null
3121 dest[dest_index++] = JVM_SIGNATURE_ENDCLASS;
3122 dest[dest_index] = '\0';
3123 return dest;
3124 }
3125
3126 ModuleEntry* InstanceKlass::module() const {
3127 if (is_hidden() &&
3128 in_unnamed_package() &&
3129 class_loader_data()->has_class_mirror_holder()) {
3130 // For a non-strong hidden class defined to an unnamed package,
3131 // its (class held) CLD will not have an unnamed module created for it.
3132 // Two choices to find the correct ModuleEntry:
3133 // 1. If hidden class is within a nest, use nest host's module
3134 // 2. Find the unnamed module off from the class loader
3135 // For now option #2 is used since a nest host is not set until
3136 // after the instance class is created in jvm_lookup_define_class().
3137 if (class_loader_data()->is_boot_class_loader_data()) {
3138 return ClassLoaderData::the_null_class_loader_data()->unnamed_module();
3139 } else {
3140 oop module = java_lang_ClassLoader::unnamedModule(class_loader_data()->class_loader());
3141 assert(java_lang_Module::is_instance(module), "Not an instance of java.lang.Module");
3142 return java_lang_Module::module_entry(module);
3143 }
3144 }
3145
3146 // Class is in a named package
3147 if (!in_unnamed_package()) {
3148 return _package_entry->module();
3149 }
3150
3151 // Class is in an unnamed package, return its loader's unnamed module
3152 return class_loader_data()->unnamed_module();
3153 }
3154
3155 bool InstanceKlass::in_javabase_module() const {
3156 return module()->name() == vmSymbols::java_base();
3157 }
3158
3159 void InstanceKlass::set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS) {
3160
3161 // ensure java/ packages only loaded by boot or platform builtin loaders
3162 // not needed for shared class since CDS does not archive prohibited classes.
3163 if (!in_aot_cache()) {
3164 check_prohibited_package(name(), loader_data, CHECK);
3165 }
3166
3167 if (in_aot_cache() && _package_entry != nullptr) {
3168 if (CDSConfig::is_using_full_module_graph() && _package_entry == pkg_entry) {
3169 // we can use the saved package
3170 assert(AOTMetaspace::in_aot_cache(_package_entry), "must be");
3171 return;
3172 } else {
3173 _package_entry = nullptr;
3174 }
3175 }
3176
3177 // ClassLoader::package_from_class_name has already incremented the refcount of the symbol
3178 // it returns, so we need to decrement it when the current function exits.
3179 TempNewSymbol from_class_name =
3180 (pkg_entry != nullptr) ? nullptr : ClassLoader::package_from_class_name(name());
3181
3182 Symbol* pkg_name;
3183 if (pkg_entry != nullptr) {
3184 pkg_name = pkg_entry->name();
3185 } else {
3186 pkg_name = from_class_name;
3187 }
3188
3189 if (pkg_name != nullptr && loader_data != nullptr) {
3190
3191 // Find in class loader's package entry table.
3192 _package_entry = pkg_entry != nullptr ? pkg_entry : loader_data->packages()->lookup_only(pkg_name);
3193
3194 // If the package name is not found in the loader's package
3195 // entry table, it is an indication that the package has not
3196 // been defined. Consider it defined within the unnamed module.
3197 if (_package_entry == nullptr) {
3198
3199 if (!ModuleEntryTable::javabase_defined()) {
3200 // Before java.base is defined during bootstrapping, define all packages in
3201 // the java.base module. If a non-java.base package is erroneously placed
3202 // in the java.base module it will be caught later when java.base
3203 // is defined by ModuleEntryTable::verify_javabase_packages check.
3204 assert(ModuleEntryTable::javabase_moduleEntry() != nullptr, JAVA_BASE_NAME " module is null");
3205 _package_entry = loader_data->packages()->create_entry_if_absent(pkg_name, ModuleEntryTable::javabase_moduleEntry());
3206 } else {
3207 assert(loader_data->unnamed_module() != nullptr, "unnamed module is null");
3208 _package_entry = loader_data->packages()->create_entry_if_absent(pkg_name, loader_data->unnamed_module());
3209 }
3210
3211 // A package should have been successfully created
3212 DEBUG_ONLY(ResourceMark rm(THREAD));
3213 assert(_package_entry != nullptr, "Package entry for class %s not found, loader %s",
3214 name()->as_C_string(), loader_data->loader_name_and_id());
3215 }
3216
3217 if (log_is_enabled(Debug, module)) {
3218 ResourceMark rm(THREAD);
3219 ModuleEntry* m = _package_entry->module();
3220 log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s",
3221 external_name(),
3222 pkg_name->as_C_string(),
3223 loader_data->loader_name_and_id(),
3224 (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE));
3225 }
3226 } else {
3227 ResourceMark rm(THREAD);
3228 log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s",
3229 external_name(),
3230 (loader_data != nullptr) ? loader_data->loader_name_and_id() : "null",
3231 UNNAMED_MODULE);
3232 }
3233 }
3234
3235 // Function set_classpath_index ensures that for a non-null _package_entry
3236 // of the InstanceKlass, the entry is in the boot loader's package entry table.
3237 // It then sets the classpath_index in the package entry record.
3238 //
3239 // The classpath_index field is used to find the entry on the boot loader class
3240 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
3241 // in an unnamed module. It is also used to indicate (for all packages whose
3242 // classes are loaded by the boot loader) that at least one of the package's
3243 // classes has been loaded.
3244 void InstanceKlass::set_classpath_index(s2 path_index) {
3245 if (_package_entry != nullptr) {
3246 DEBUG_ONLY(PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();)
3247 assert(pkg_entry_tbl->lookup_only(_package_entry->name()) == _package_entry, "Should be same");
3248 assert(path_index != -1, "Unexpected classpath_index");
3249 _package_entry->set_classpath_index(path_index);
3250 }
3251 }
3252
3253 // different versions of is_same_class_package
3254
3255 bool InstanceKlass::is_same_class_package(const Klass* class2) const {
3256 oop classloader1 = this->class_loader();
3257 PackageEntry* classpkg1 = this->package();
3258 if (class2->is_objArray_klass()) {
3259 class2 = ObjArrayKlass::cast(class2)->bottom_klass();
3260 }
3261
3262 oop classloader2;
3263 PackageEntry* classpkg2;
3264 if (class2->is_instance_klass()) {
3265 classloader2 = class2->class_loader();
3266 classpkg2 = class2->package();
3267 } else {
3268 assert(class2->is_typeArray_klass(), "should be type array");
3269 classloader2 = nullptr;
3270 classpkg2 = nullptr;
3271 }
3272
3273 // Same package is determined by comparing class loader
3274 // and package entries. Both must be the same. This rule
3275 // applies even to classes that are defined in the unnamed
3276 // package, they still must have the same class loader.
3277 if ((classloader1 == classloader2) && (classpkg1 == classpkg2)) {
3278 return true;
3279 }
3280
3281 return false;
3282 }
3283
3284 // return true if this class and other_class are in the same package. Classloader
3285 // and classname information is enough to determine a class's package
3286 bool InstanceKlass::is_same_class_package(oop other_class_loader,
3287 const Symbol* other_class_name) const {
3288 if (class_loader() != other_class_loader) {
3289 return false;
3290 }
3291 if (name()->fast_compare(other_class_name) == 0) {
3292 return true;
3293 }
3294
3295 {
3296 ResourceMark rm;
3297
3298 bool bad_class_name = false;
3299 TempNewSymbol other_pkg = ClassLoader::package_from_class_name(other_class_name, &bad_class_name);
3300 if (bad_class_name) {
3301 return false;
3302 }
3303 // Check that package_from_class_name() returns null, not "", if there is no package.
3304 assert(other_pkg == nullptr || other_pkg->utf8_length() > 0, "package name is empty string");
3305
3306 const Symbol* const this_package_name =
3307 this->package() != nullptr ? this->package()->name() : nullptr;
3308
3309 if (this_package_name == nullptr || other_pkg == nullptr) {
3310 // One of the two doesn't have a package. Only return true if the other
3311 // one also doesn't have a package.
3312 return this_package_name == other_pkg;
3313 }
3314
3315 // Check if package is identical
3316 return this_package_name->fast_compare(other_pkg) == 0;
3317 }
3318 }
3319
3320 static bool is_prohibited_package_slow(Symbol* class_name) {
3321 // Caller has ResourceMark
3322 int length;
3323 jchar* unicode = class_name->as_unicode(length);
3324 return (length >= 5 &&
3325 unicode[0] == 'j' &&
3326 unicode[1] == 'a' &&
3327 unicode[2] == 'v' &&
3328 unicode[3] == 'a' &&
3329 unicode[4] == '/');
3330 }
3331
3332 // Only boot and platform class loaders can define classes in "java/" packages.
3333 void InstanceKlass::check_prohibited_package(Symbol* class_name,
3334 ClassLoaderData* loader_data,
3335 TRAPS) {
3336 if (!loader_data->is_boot_class_loader_data() &&
3337 !loader_data->is_platform_class_loader_data() &&
3338 class_name != nullptr && class_name->utf8_length() >= 5) {
3339 ResourceMark rm(THREAD);
3340 bool prohibited;
3341 const u1* base = class_name->base();
3342 if ((base[0] | base[1] | base[2] | base[3] | base[4]) & 0x80) {
3343 prohibited = is_prohibited_package_slow(class_name);
3344 } else {
3345 char* name = class_name->as_C_string();
3346 prohibited = (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/');
3347 }
3348 if (prohibited) {
3349 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name);
3350 assert(pkg_name != nullptr, "Error in parsing package name starting with 'java/'");
3351 char* name = pkg_name->as_C_string();
3352 const char* class_loader_name = loader_data->loader_name_and_id();
3353 StringUtils::replace_no_expand(name, "/", ".");
3354 const char* msg_text1 = "Class loader (instance of): ";
3355 const char* msg_text2 = " tried to load prohibited package name: ";
3356 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1;
3357 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
3358 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name);
3359 THROW_MSG(vmSymbols::java_lang_SecurityException(), message);
3360 }
3361 }
3362 return;
3363 }
3364
3365 bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const {
3366 constantPoolHandle i_cp(THREAD, constants());
3367 for (InnerClassesIterator iter(this); !iter.done(); iter.next()) {
3368 int ioff = iter.inner_class_info_index();
3369 if (ioff != 0) {
3370 // Check to see if the name matches the class we're looking for
3371 // before attempting to find the class.
3372 if (i_cp->klass_name_at_matches(this, ioff)) {
3373 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false);
3374 if (this == inner_klass) {
3375 *ooff = iter.outer_class_info_index();
3376 *noff = iter.inner_name_index();
3377 return true;
3378 }
3379 }
3380 }
3381 }
3382 return false;
3383 }
3384
3385 InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const {
3386 InstanceKlass* outer_klass = nullptr;
3387 *inner_is_member = false;
3388 int ooff = 0, noff = 0;
3389 bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD);
3390 if (has_inner_classes_attr) {
3391 constantPoolHandle i_cp(THREAD, constants());
3392 if (ooff != 0) {
3393 Klass* ok = i_cp->klass_at(ooff, CHECK_NULL);
3394 if (!ok->is_instance_klass()) {
3395 // If the outer class is not an instance klass then it cannot have
3396 // declared any inner classes.
3397 ResourceMark rm(THREAD);
3398 // Names are all known to be < 64k so we know this formatted message is not excessively large.
3399 Exceptions::fthrow(
3400 THREAD_AND_LOCATION,
3401 vmSymbols::java_lang_IncompatibleClassChangeError(),
3402 "%s and %s disagree on InnerClasses attribute",
3403 ok->external_name(),
3404 external_name());
3405 return nullptr;
3406 }
3407 outer_klass = InstanceKlass::cast(ok);
3408 *inner_is_member = true;
3409 }
3410 if (nullptr == outer_klass) {
3411 // It may be a local class; try for that.
3412 int encl_method_class_idx = enclosing_method_class_index();
3413 if (encl_method_class_idx != 0) {
3414 Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
3415 outer_klass = InstanceKlass::cast(ok);
3416 *inner_is_member = false;
3417 }
3418 }
3419 }
3420
3421 // If no inner class attribute found for this class.
3422 if (nullptr == outer_klass) return nullptr;
3423
3424 // Throws an exception if outer klass has not declared k as an inner klass
3425 // We need evidence that each klass knows about the other, or else
3426 // the system could allow a spoof of an inner class to gain access rights.
3427 Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL);
3428 return outer_klass;
3429 }
3430
3431 u2 InstanceKlass::compute_modifier_flags() const {
3432 u2 access = access_flags().as_unsigned_short();
3433
3434 // But check if it happens to be member class.
3435 InnerClassesIterator iter(this);
3436 for (; !iter.done(); iter.next()) {
3437 int ioff = iter.inner_class_info_index();
3438 // Inner class attribute can be zero, skip it.
3439 // Strange but true: JVM spec. allows null inner class refs.
3440 if (ioff == 0) continue;
3441
3442 // only look at classes that are already loaded
3443 // since we are looking for the flags for our self.
3444 Symbol* inner_name = constants()->klass_name_at(ioff);
3445 if (name() == inner_name) {
3446 // This is really a member class.
3447 access = iter.inner_access_flags();
3448 break;
3449 }
3450 }
3451 // Remember to strip ACC_SUPER bit
3452 return (access & (~JVM_ACC_SUPER));
3453 }
3454
3455 jint InstanceKlass::jvmti_class_status() const {
3456 jint result = 0;
3457
3458 if (is_linked()) {
3459 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
3460 }
3461
3462 if (is_initialized()) {
3463 assert(is_linked(), "Class status is not consistent");
3464 result |= JVMTI_CLASS_STATUS_INITIALIZED;
3465 }
3466 if (is_in_error_state()) {
3467 result |= JVMTI_CLASS_STATUS_ERROR;
3468 }
3469 return result;
3470 }
3471
3472 Method* InstanceKlass::method_at_itable(InstanceKlass* holder, int index, TRAPS) {
3473 bool implements_interface; // initialized by method_at_itable_or_null
3474 Method* m = method_at_itable_or_null(holder, index,
3475 implements_interface); // out parameter
3476 if (m != nullptr) {
3477 assert(implements_interface, "sanity");
3478 return m;
3479 } else if (implements_interface) {
3480 // Throw AbstractMethodError since corresponding itable slot is empty.
3481 THROW_NULL(vmSymbols::java_lang_AbstractMethodError());
3482 } else {
3483 // If the interface isn't implemented by the receiver class,
3484 // the VM should throw IncompatibleClassChangeError.
3485 ResourceMark rm(THREAD);
3486 stringStream ss;
3487 bool same_module = (module() == holder->module());
3488 ss.print("Receiver class %s does not implement "
3489 "the interface %s defining the method to be called "
3490 "(%s%s%s)",
3491 external_name(), holder->external_name(),
3492 (same_module) ? joint_in_module_of_loader(holder) : class_in_module_of_loader(),
3493 (same_module) ? "" : "; ",
3494 (same_module) ? "" : holder->class_in_module_of_loader());
3495 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
3496 }
3497 }
3498
3499 Method* InstanceKlass::method_at_itable_or_null(InstanceKlass* holder, int index, bool& implements_interface) {
3500 klassItable itable(this);
3501 for (int i = 0; i < itable.size_offset_table(); i++) {
3502 itableOffsetEntry* offset_entry = itable.offset_entry(i);
3503 if (offset_entry->interface_klass() == holder) {
3504 implements_interface = true;
3505 itableMethodEntry* ime = offset_entry->first_method_entry(this);
3506 Method* m = ime[index].method();
3507 return m;
3508 }
3509 }
3510 implements_interface = false;
3511 return nullptr; // offset entry not found
3512 }
3513
3514 int InstanceKlass::vtable_index_of_interface_method(Method* intf_method) {
3515 assert(is_linked(), "required");
3516 assert(intf_method->method_holder()->is_interface(), "not an interface method");
3517 assert(is_subtype_of(intf_method->method_holder()), "interface not implemented");
3518
3519 int vtable_index = Method::invalid_vtable_index;
3520 Symbol* name = intf_method->name();
3521 Symbol* signature = intf_method->signature();
3522
3523 // First check in default method array
3524 if (!intf_method->is_abstract() && default_methods() != nullptr) {
3525 int index = find_method_index(default_methods(),
3526 name, signature,
3527 Klass::OverpassLookupMode::find,
3528 Klass::StaticLookupMode::find,
3529 Klass::PrivateLookupMode::find);
3530 if (index >= 0) {
3531 vtable_index = default_vtable_indices()->at(index);
3532 }
3533 }
3534 if (vtable_index == Method::invalid_vtable_index) {
3535 // get vtable_index for miranda methods
3536 klassVtable vt = vtable();
3537 vtable_index = vt.index_of_miranda(name, signature);
3538 }
3539 return vtable_index;
3540 }
3541
3542 #if INCLUDE_JVMTI
3543 // update default_methods for redefineclasses for methods that are
3544 // not yet in the vtable due to concurrent subclass define and superinterface
3545 // redefinition
3546 // Note: those in the vtable, should have been updated via adjust_method_entries
3547 void InstanceKlass::adjust_default_methods(bool* trace_name_printed) {
3548 // search the default_methods for uses of either obsolete or EMCP methods
3549 if (default_methods() != nullptr) {
3550 for (int index = 0; index < default_methods()->length(); index ++) {
3551 Method* old_method = default_methods()->at(index);
3552 if (old_method == nullptr || !old_method->is_old()) {
3553 continue; // skip uninteresting entries
3554 }
3555 assert(!old_method->is_deleted(), "default methods may not be deleted");
3556 Method* new_method = old_method->get_new_method();
3557 default_methods()->at_put(index, new_method);
3558
3559 if (log_is_enabled(Info, redefine, class, update)) {
3560 ResourceMark rm;
3561 if (!(*trace_name_printed)) {
3562 log_info(redefine, class, update)
3563 ("adjust: klassname=%s default methods from name=%s",
3564 external_name(), old_method->method_holder()->external_name());
3565 *trace_name_printed = true;
3566 }
3567 log_debug(redefine, class, update, vtables)
3568 ("default method update: %s(%s) ",
3569 new_method->name()->as_C_string(), new_method->signature()->as_C_string());
3570 }
3571 }
3572 }
3573 }
3574 #endif // INCLUDE_JVMTI
3575
3576 // On-stack replacement stuff
3577 void InstanceKlass::add_osr_nmethod(nmethod* n) {
3578 assert_lock_strong(NMethodState_lock);
3579 #ifndef PRODUCT
3580 nmethod* prev = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), n->comp_level(), true);
3581 assert(prev == nullptr || !prev->is_in_use() COMPILER2_PRESENT(|| StressRecompilation),
3582 "redundant OSR recompilation detected. memory leak in CodeCache!");
3583 #endif
3584 // only one compilation can be active
3585 assert(n->is_osr_method(), "wrong kind of nmethod");
3586 n->set_osr_link(osr_nmethods_head());
3587 set_osr_nmethods_head(n);
3588 // Raise the highest osr level if necessary
3589 n->method()->set_highest_osr_comp_level(MAX2(n->method()->highest_osr_comp_level(), n->comp_level()));
3590
3591 // Get rid of the osr methods for the same bci that have lower levels.
3592 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) {
3593 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true);
3594 if (inv != nullptr && inv->is_in_use()) {
3595 inv->make_not_entrant(nmethod::InvalidationReason::OSR_INVALIDATION_OF_LOWER_LEVEL);
3596 }
3597 }
3598 }
3599
3600 // Remove osr nmethod from the list. Return true if found and removed.
3601 bool InstanceKlass::remove_osr_nmethod(nmethod* n) {
3602 // This is a short non-blocking critical region, so the no safepoint check is ok.
3603 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
3604 assert(n->is_osr_method(), "wrong kind of nmethod");
3605 nmethod* last = nullptr;
3606 nmethod* cur = osr_nmethods_head();
3607 int max_level = CompLevel_none; // Find the max comp level excluding n
3608 Method* m = n->method();
3609 // Search for match
3610 bool found = false;
3611 while(cur != nullptr && cur != n) {
3612 if (m == cur->method()) {
3613 // Find max level before n
3614 max_level = MAX2(max_level, cur->comp_level());
3615 }
3616 last = cur;
3617 cur = cur->osr_link();
3618 }
3619 nmethod* next = nullptr;
3620 if (cur == n) {
3621 found = true;
3622 next = cur->osr_link();
3623 if (last == nullptr) {
3624 // Remove first element
3625 set_osr_nmethods_head(next);
3626 } else {
3627 last->set_osr_link(next);
3628 }
3629 }
3630 n->set_osr_link(nullptr);
3631 cur = next;
3632 while (cur != nullptr) {
3633 // Find max level after n
3634 if (m == cur->method()) {
3635 max_level = MAX2(max_level, cur->comp_level());
3636 }
3637 cur = cur->osr_link();
3638 }
3639 m->set_highest_osr_comp_level(max_level);
3640 return found;
3641 }
3642
3643 int InstanceKlass::mark_osr_nmethods(DeoptimizationScope* deopt_scope, const Method* m) {
3644 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
3645 nmethod* osr = osr_nmethods_head();
3646 int found = 0;
3647 while (osr != nullptr) {
3648 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3649 if (osr->method() == m) {
3650 deopt_scope->mark(osr);
3651 found++;
3652 }
3653 osr = osr->osr_link();
3654 }
3655 return found;
3656 }
3657
3658 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
3659 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
3660 nmethod* osr = osr_nmethods_head();
3661 nmethod* best = nullptr;
3662 while (osr != nullptr) {
3663 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3664 // There can be a time when a c1 osr method exists but we are waiting
3665 // for a c2 version. When c2 completes its osr nmethod we will trash
3666 // the c1 version and only be able to find the c2 version. However
3667 // while we overflow in the c1 code at back branches we don't want to
3668 // try and switch to the same code as we are already running
3669
3670 if (osr->method() == m &&
3671 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
3672 if (match_level) {
3673 if (osr->comp_level() == comp_level) {
3674 // Found a match - return it.
3675 return osr;
3676 }
3677 } else {
3678 if (best == nullptr || (osr->comp_level() > best->comp_level())) {
3679 if (osr->comp_level() == CompilationPolicy::highest_compile_level()) {
3680 // Found the best possible - return it.
3681 return osr;
3682 }
3683 best = osr;
3684 }
3685 }
3686 }
3687 osr = osr->osr_link();
3688 }
3689
3690 assert(match_level == false || best == nullptr, "shouldn't pick up anything if match_level is set");
3691 if (best != nullptr && best->comp_level() >= comp_level) {
3692 return best;
3693 }
3694 return nullptr;
3695 }
3696
3697 // -----------------------------------------------------------------------------------------------------
3698 // Printing
3699
3700 #define BULLET " - "
3701
3702 static const char* state_names[] = {
3703 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
3704 };
3705
3706 static void print_vtable(intptr_t* start, int len, outputStream* st) {
3707 for (int i = 0; i < len; i++) {
3708 intptr_t e = start[i];
3709 st->print("%d : " INTPTR_FORMAT, i, e);
3710 if (MetaspaceObj::is_valid((Metadata*)e)) {
3711 st->print(" ");
3712 ((Metadata*)e)->print_value_on(st);
3713 }
3714 st->cr();
3715 }
3716 }
3717
3718 static void print_vtable(vtableEntry* start, int len, outputStream* st) {
3719 return print_vtable(reinterpret_cast<intptr_t*>(start), len, st);
3720 }
3721
3722 const char* InstanceKlass::init_state_name() const {
3723 return state_names[init_state()];
3724 }
3725
3726 const char* InstanceKlass::state2name(ClassState s) {
3727 return state_names[s];
3728 }
3729
3730 void InstanceKlass::print_on(outputStream* st) const {
3731 assert(is_klass(), "must be klass");
3732 Klass::print_on(st);
3733
3734 st->print(BULLET"instance size: %d", size_helper()); st->cr();
3735 st->print(BULLET"klass size: %d", size()); st->cr();
3736 st->print(BULLET"access: "); access_flags().print_on(st); st->cr();
3737 st->print(BULLET"flags: "); _misc_flags.print_on(st); st->cr();
3738 st->print(BULLET"state: "); st->print_cr("%s", init_state_name());
3739 st->print(BULLET"name: "); name()->print_value_on(st); st->cr();
3740 st->print(BULLET"super: "); Metadata::print_value_on_maybe_null(st, super()); st->cr();
3741 st->print(BULLET"sub: ");
3742 Klass* sub = subklass();
3743 int n;
3744 for (n = 0; sub != nullptr; n++, sub = sub->next_sibling()) {
3745 if (n < MaxSubklassPrintSize) {
3746 sub->print_value_on(st);
3747 st->print(" ");
3748 }
3749 }
3750 if (n >= MaxSubklassPrintSize) st->print("(%zd more klasses...)", n - MaxSubklassPrintSize);
3751 st->cr();
3752
3753 if (is_interface()) {
3754 st->print_cr(BULLET"nof implementors: %d", nof_implementors());
3755 if (nof_implementors() == 1) {
3756 st->print_cr(BULLET"implementor: ");
3757 st->print(" ");
3758 implementor()->print_value_on(st);
3759 st->cr();
3760 }
3761 }
3762
3763 st->print(BULLET"arrays: "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr();
3764 st->print(BULLET"methods: "); methods()->print_value_on(st); st->cr();
3765 if (Verbose || WizardMode) {
3766 Array<Method*>* method_array = methods();
3767 for (int i = 0; i < method_array->length(); i++) {
3768 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3769 }
3770 }
3771 st->print(BULLET"method ordering: "); method_ordering()->print_value_on(st); st->cr();
3772 if (default_methods() != nullptr) {
3773 st->print(BULLET"default_methods: "); default_methods()->print_value_on(st); st->cr();
3774 if (Verbose) {
3775 Array<Method*>* method_array = default_methods();
3776 for (int i = 0; i < method_array->length(); i++) {
3777 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3778 }
3779 }
3780 }
3781 print_on_maybe_null(st, BULLET"default vtable indices: ", default_vtable_indices());
3782 st->print(BULLET"local interfaces: "); local_interfaces()->print_value_on(st); st->cr();
3783 st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr();
3784
3785 st->print(BULLET"secondary supers: "); secondary_supers()->print_value_on(st); st->cr();
3786
3787 st->print(BULLET"hash_slot: %d", hash_slot()); st->cr();
3788 st->print(BULLET"secondary bitmap: " UINTX_FORMAT_X_0, _secondary_supers_bitmap); st->cr();
3789
3790 if (secondary_supers() != nullptr) {
3791 if (Verbose) {
3792 bool is_hashed = (_secondary_supers_bitmap != SECONDARY_SUPERS_BITMAP_FULL);
3793 st->print_cr(BULLET"---- secondary supers (%d words):", _secondary_supers->length());
3794 for (int i = 0; i < _secondary_supers->length(); i++) {
3795 ResourceMark rm; // for external_name()
3796 Klass* secondary_super = _secondary_supers->at(i);
3797 st->print(BULLET"%2d:", i);
3798 if (is_hashed) {
3799 int home_slot = compute_home_slot(secondary_super, _secondary_supers_bitmap);
3800 int distance = (i - home_slot) & SECONDARY_SUPERS_TABLE_MASK;
3801 st->print(" dist:%02d:", distance);
3802 }
3803 st->print_cr(" %p %s", secondary_super, secondary_super->external_name());
3804 }
3805 }
3806 }
3807 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr();
3808
3809 print_on_maybe_null(st, BULLET"class loader data: ", class_loader_data());
3810 print_on_maybe_null(st, BULLET"source file: ", source_file_name());
3811 if (source_debug_extension() != nullptr) {
3812 st->print(BULLET"source debug extension: ");
3813 st->print("%s", source_debug_extension());
3814 st->cr();
3815 }
3816 print_on_maybe_null(st, BULLET"class annotations: ", class_annotations());
3817 print_on_maybe_null(st, BULLET"class type annotations: ", class_type_annotations());
3818 print_on_maybe_null(st, BULLET"field annotations: ", fields_annotations());
3819 print_on_maybe_null(st, BULLET"field type annotations: ", fields_type_annotations());
3820 {
3821 bool have_pv = false;
3822 // previous versions are linked together through the InstanceKlass
3823 for (InstanceKlass* pv_node = previous_versions();
3824 pv_node != nullptr;
3825 pv_node = pv_node->previous_versions()) {
3826 if (!have_pv)
3827 st->print(BULLET"previous version: ");
3828 have_pv = true;
3829 pv_node->constants()->print_value_on(st);
3830 }
3831 if (have_pv) st->cr();
3832 }
3833
3834 print_on_maybe_null(st, BULLET"generic signature: ", generic_signature());
3835 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr();
3836 st->print(BULLET"nest members: "); nest_members()->print_value_on(st); st->cr();
3837 print_on_maybe_null(st, BULLET"record components: ", record_components());
3838 st->print(BULLET"permitted subclasses: "); permitted_subclasses()->print_value_on(st); st->cr();
3839 if (java_mirror() != nullptr) {
3840 st->print(BULLET"java mirror: ");
3841 java_mirror()->print_value_on(st);
3842 st->cr();
3843 } else {
3844 st->print_cr(BULLET"java mirror: null");
3845 }
3846 st->print(BULLET"vtable length %d (start addr: " PTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
3847 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st);
3848 st->print(BULLET"itable length %d (start addr: " PTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
3849 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_itable(), itable_length(), st);
3850 st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
3851
3852 FieldPrinter print_static_field(st);
3853 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
3854 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
3855 FieldPrinter print_nonstatic_field(st);
3856 InstanceKlass* ik = const_cast<InstanceKlass*>(this);
3857 ik->print_nonstatic_fields(&print_nonstatic_field);
3858
3859 st->print(BULLET"non-static oop maps (%d entries): ", nonstatic_oop_map_count());
3860 OopMapBlock* map = start_of_nonstatic_oop_maps();
3861 OopMapBlock* end_map = map + nonstatic_oop_map_count();
3862 while (map < end_map) {
3863 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
3864 map++;
3865 }
3866 st->cr();
3867
3868 if (fieldinfo_search_table() != nullptr) {
3869 st->print_cr(BULLET"---- field info search table:");
3870 FieldInfoStream::print_search_table(st, _constants, _fieldinfo_stream, _fieldinfo_search_table);
3871 }
3872 }
3873
3874 void InstanceKlass::print_value_on(outputStream* st) const {
3875 assert(is_klass(), "must be klass");
3876 if (Verbose || WizardMode) access_flags().print_on(st);
3877 name()->print_value_on(st);
3878 }
3879
3880 void FieldPrinter::do_field(fieldDescriptor* fd) {
3881 _st->print(BULLET);
3882 if (_obj == nullptr) {
3883 fd->print_on(_st);
3884 _st->cr();
3885 } else {
3886 fd->print_on_for(_st, _obj);
3887 _st->cr();
3888 }
3889 }
3890
3891
3892 void InstanceKlass::oop_print_on(oop obj, outputStream* st) {
3893 Klass::oop_print_on(obj, st);
3894
3895 if (this == vmClasses::String_klass()) {
3896 typeArrayOop value = java_lang_String::value(obj);
3897 juint length = java_lang_String::length(obj);
3898 if (value != nullptr &&
3899 value->is_typeArray() &&
3900 length <= (juint) value->length()) {
3901 st->print(BULLET"string: ");
3902 java_lang_String::print(obj, st);
3903 st->cr();
3904 }
3905 }
3906
3907 st->print_cr(BULLET"---- fields (total size %zu words):", oop_size(obj));
3908 FieldPrinter print_field(st, obj);
3909 print_nonstatic_fields(&print_field);
3910
3911 if (this == vmClasses::Class_klass()) {
3912 st->print(BULLET"signature: ");
3913 java_lang_Class::print_signature(obj, st);
3914 st->cr();
3915 Klass* real_klass = java_lang_Class::as_Klass(obj);
3916 if (real_klass != nullptr && real_klass->is_instance_klass()) {
3917 st->print_cr(BULLET"---- static fields (%d):", java_lang_Class::static_oop_field_count(obj));
3918 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
3919 }
3920 } else if (this == vmClasses::MethodType_klass()) {
3921 st->print(BULLET"signature: ");
3922 java_lang_invoke_MethodType::print_signature(obj, st);
3923 st->cr();
3924 }
3925 }
3926
3927 #ifndef PRODUCT
3928
3929 bool InstanceKlass::verify_itable_index(int i) {
3930 int method_count = klassItable::method_count_for_interface(this);
3931 assert(i >= 0 && i < method_count, "index out of bounds");
3932 return true;
3933 }
3934
3935 #endif //PRODUCT
3936
3937 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
3938 st->print("a ");
3939 name()->print_value_on(st);
3940 obj->print_address_on(st);
3941 if (this == vmClasses::String_klass()
3942 && java_lang_String::value(obj) != nullptr) {
3943 ResourceMark rm;
3944 int len = java_lang_String::length(obj);
3945 int plen = (len < 24 ? len : 12);
3946 char* str = java_lang_String::as_utf8_string(obj, 0, plen);
3947 st->print(" = \"%s\"", str);
3948 if (len > plen)
3949 st->print("...[%d]", len);
3950 } else if (this == vmClasses::Class_klass()) {
3951 Klass* k = java_lang_Class::as_Klass(obj);
3952 st->print(" = ");
3953 if (k != nullptr) {
3954 k->print_value_on(st);
3955 } else {
3956 const char* tname = type2name(java_lang_Class::primitive_type(obj));
3957 st->print("%s", tname ? tname : "type?");
3958 }
3959 } else if (this == vmClasses::MethodType_klass()) {
3960 st->print(" = ");
3961 java_lang_invoke_MethodType::print_signature(obj, st);
3962 } else if (java_lang_boxing_object::is_instance(obj)) {
3963 st->print(" = ");
3964 java_lang_boxing_object::print(obj, st);
3965 } else if (this == vmClasses::LambdaForm_klass()) {
3966 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
3967 if (vmentry != nullptr) {
3968 st->print(" => ");
3969 vmentry->print_value_on(st);
3970 }
3971 } else if (this == vmClasses::MemberName_klass()) {
3972 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
3973 if (vmtarget != nullptr) {
3974 st->print(" = ");
3975 vmtarget->print_value_on(st);
3976 } else {
3977 oop clazz = java_lang_invoke_MemberName::clazz(obj);
3978 oop name = java_lang_invoke_MemberName::name(obj);
3979 if (clazz != nullptr) {
3980 clazz->print_value_on(st);
3981 } else {
3982 st->print("null");
3983 }
3984 st->print(".");
3985 if (name != nullptr) {
3986 name->print_value_on(st);
3987 } else {
3988 st->print("null");
3989 }
3990 }
3991 }
3992 }
3993
3994 const char* InstanceKlass::internal_name() const {
3995 return external_name();
3996 }
3997
3998 void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data,
3999 const ModuleEntry* module_entry,
4000 const ClassFileStream* cfs) const {
4001
4002 if (ClassListWriter::is_enabled()) {
4003 ClassListWriter::write(this, cfs);
4004 }
4005
4006 print_class_load_helper(loader_data, module_entry, cfs);
4007 print_class_load_cause_logging();
4008 }
4009
4010 void InstanceKlass::print_class_load_helper(ClassLoaderData* loader_data,
4011 const ModuleEntry* module_entry,
4012 const ClassFileStream* cfs) const {
4013
4014 if (!log_is_enabled(Info, class, load)) {
4015 return;
4016 }
4017
4018 ResourceMark rm;
4019 LogMessage(class, load) msg;
4020 stringStream info_stream;
4021
4022 // Name and class hierarchy info
4023 info_stream.print("%s", external_name());
4024
4025 // Source
4026 if (cfs != nullptr) {
4027 if (cfs->source() != nullptr) {
4028 const char* module_name = (module_entry->name() == nullptr) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
4029 if (module_name != nullptr) {
4030 // When the boot loader created the stream, it didn't know the module name
4031 // yet. Let's format it now.
4032 if (cfs->from_boot_loader_modules_image()) {
4033 info_stream.print(" source: jrt:/%s", module_name);
4034 } else {
4035 info_stream.print(" source: %s", cfs->source());
4036 }
4037 } else {
4038 info_stream.print(" source: %s", cfs->source());
4039 }
4040 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) {
4041 Thread* current = Thread::current();
4042 Klass* caller = current->is_Java_thread() ?
4043 JavaThread::cast(current)->security_get_caller_class(1):
4044 nullptr;
4045 // caller can be null, for example, during a JVMTI VM_Init hook
4046 if (caller != nullptr) {
4047 info_stream.print(" source: instance of %s", caller->external_name());
4048 } else {
4049 // source is unknown
4050 }
4051 } else {
4052 oop class_loader = loader_data->class_loader();
4053 info_stream.print(" source: %s", class_loader->klass()->external_name());
4054 }
4055 } else {
4056 assert(this->in_aot_cache(), "must be");
4057 if (AOTMetaspace::in_aot_cache_dynamic_region((void*)this)) {
4058 info_stream.print(" source: shared objects file (top)");
4059 } else {
4060 info_stream.print(" source: shared objects file");
4061 }
4062 }
4063
4064 info_stream.print(" loader:");
4065 if (in_aot_cache()) {
4066 info_stream.print(" %s", SystemDictionaryShared::loader_type_for_shared_class((Klass*)this));
4067 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) {
4068 info_stream.print(" boot_loader");
4069 } else {
4070 oop class_loader = loader_data->class_loader();
4071 if (class_loader != nullptr) {
4072 info_stream.print(" %s", class_loader->klass()->external_name());
4073 oop cl_name_and_id = java_lang_ClassLoader::nameAndId(class_loader);
4074 if (cl_name_and_id != nullptr) {
4075 info_stream.print(" %s", java_lang_String::as_utf8_string(cl_name_and_id));
4076 }
4077 } else {
4078 info_stream.print(" null");
4079 }
4080 }
4081 msg.info("%s", info_stream.as_string());
4082
4083 if (log_is_enabled(Debug, class, load)) {
4084 stringStream debug_stream;
4085
4086 // Class hierarchy info
4087 debug_stream.print(" klass: " PTR_FORMAT " super: " PTR_FORMAT,
4088 p2i(this), p2i(super()));
4089
4090 // Interfaces
4091 if (local_interfaces() != nullptr && local_interfaces()->length() > 0) {
4092 debug_stream.print(" interfaces:");
4093 int length = local_interfaces()->length();
4094 for (int i = 0; i < length; i++) {
4095 debug_stream.print(" " PTR_FORMAT,
4096 p2i(local_interfaces()->at(i)));
4097 }
4098 }
4099
4100 // Class loader
4101 debug_stream.print(" loader: [");
4102 loader_data->print_value_on(&debug_stream);
4103 debug_stream.print("]");
4104
4105 // Classfile checksum
4106 if (cfs) {
4107 debug_stream.print(" bytes: %d checksum: %08x",
4108 cfs->length(),
4109 ClassLoader::crc32(0, (const char*)cfs->buffer(),
4110 cfs->length()));
4111 }
4112
4113 msg.debug("%s", debug_stream.as_string());
4114 }
4115 }
4116
4117 void InstanceKlass::print_class_load_cause_logging() const {
4118 bool log_cause_native = log_is_enabled(Info, class, load, cause, native);
4119 if (log_cause_native || log_is_enabled(Info, class, load, cause)) {
4120 JavaThread* current = JavaThread::current();
4121 ResourceMark rm(current);
4122 const char* name = external_name();
4123
4124 if (LogClassLoadingCauseFor == nullptr ||
4125 (strcmp("*", LogClassLoadingCauseFor) != 0 &&
4126 strstr(name, LogClassLoadingCauseFor) == nullptr)) {
4127 return;
4128 }
4129
4130 // Log Java stack first
4131 {
4132 LogMessage(class, load, cause) msg;
4133 NonInterleavingLogStream info_stream{LogLevelType::Info, msg};
4134
4135 info_stream.print_cr("Java stack when loading %s:", name);
4136 current->print_stack_on(&info_stream);
4137 }
4138
4139 // Log native stack second
4140 if (log_cause_native) {
4141 // Log to string first so that lines can be indented
4142 stringStream stack_stream;
4143 char buf[O_BUFLEN];
4144 address lastpc = nullptr;
4145 NativeStackPrinter nsp(current);
4146 nsp.print_stack(&stack_stream, buf, sizeof(buf), lastpc,
4147 true /* print_source_info */, -1 /* max stack */);
4148
4149 LogMessage(class, load, cause, native) msg;
4150 NonInterleavingLogStream info_stream{LogLevelType::Info, msg};
4151 info_stream.print_cr("Native stack when loading %s:", name);
4152
4153 // Print each native stack line to the log
4154 int size = (int) stack_stream.size();
4155 char* stack = stack_stream.as_string();
4156 char* stack_end = stack + size;
4157 char* line_start = stack;
4158 for (char* p = stack; p < stack_end; p++) {
4159 if (*p == '\n') {
4160 *p = '\0';
4161 info_stream.print_cr("\t%s", line_start);
4162 line_start = p + 1;
4163 }
4164 }
4165 if (line_start < stack_end) {
4166 info_stream.print_cr("\t%s", line_start);
4167 }
4168 }
4169 }
4170 }
4171
4172 // Verification
4173
4174 class VerifyFieldClosure: public BasicOopIterateClosure {
4175 protected:
4176 template <class T> void do_oop_work(T* p) {
4177 oop obj = RawAccess<>::oop_load(p);
4178 if (!oopDesc::is_oop_or_null(obj)) {
4179 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj));
4180 Universe::print_on(tty);
4181 guarantee(false, "boom");
4182 }
4183 }
4184 public:
4185 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); }
4186 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
4187 };
4188
4189 void InstanceKlass::verify_on(outputStream* st) {
4190 #ifndef PRODUCT
4191 // Avoid redundant verifies, this really should be in product.
4192 if (_verify_count == Universe::verify_count()) return;
4193 _verify_count = Universe::verify_count();
4194 #endif
4195
4196 // Verify Klass
4197 Klass::verify_on(st);
4198
4199 // Verify that klass is present in ClassLoaderData
4200 guarantee(class_loader_data()->contains_klass(this),
4201 "this class isn't found in class loader data");
4202
4203 // Verify vtables
4204 if (is_linked()) {
4205 // $$$ This used to be done only for m/s collections. Doing it
4206 // always seemed a valid generalization. (DLD -- 6/00)
4207 vtable().verify(st);
4208 }
4209
4210 // Verify first subklass
4211 if (subklass() != nullptr) {
4212 guarantee(subklass()->is_klass(), "should be klass");
4213 }
4214
4215 // Verify siblings
4216 Klass* super = this->super();
4217 Klass* sib = next_sibling();
4218 if (sib != nullptr) {
4219 if (sib == this) {
4220 fatal("subclass points to itself " PTR_FORMAT, p2i(sib));
4221 }
4222
4223 guarantee(sib->is_klass(), "should be klass");
4224 guarantee(sib->super() == super, "siblings should have same superklass");
4225 }
4226
4227 // Verify local interfaces
4228 if (local_interfaces()) {
4229 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
4230 for (int j = 0; j < local_interfaces->length(); j++) {
4231 InstanceKlass* e = local_interfaces->at(j);
4232 guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
4233 }
4234 }
4235
4236 // Verify transitive interfaces
4237 if (transitive_interfaces() != nullptr) {
4238 Array<InstanceKlass*>* transitive_interfaces = this->transitive_interfaces();
4239 for (int j = 0; j < transitive_interfaces->length(); j++) {
4240 InstanceKlass* e = transitive_interfaces->at(j);
4241 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
4242 }
4243 }
4244
4245 // Verify methods
4246 if (methods() != nullptr) {
4247 Array<Method*>* methods = this->methods();
4248 for (int j = 0; j < methods->length(); j++) {
4249 guarantee(methods->at(j)->is_method(), "non-method in methods array");
4250 }
4251 for (int j = 0; j < methods->length() - 1; j++) {
4252 Method* m1 = methods->at(j);
4253 Method* m2 = methods->at(j + 1);
4254 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
4255 }
4256 }
4257
4258 // Verify method ordering
4259 if (method_ordering() != nullptr) {
4260 Array<int>* method_ordering = this->method_ordering();
4261 int length = method_ordering->length();
4262 if (JvmtiExport::can_maintain_original_method_order() ||
4263 ((CDSConfig::is_using_archive() || CDSConfig::is_dumping_archive()) && length != 0)) {
4264 guarantee(length == methods()->length(), "invalid method ordering length");
4265 jlong sum = 0;
4266 for (int j = 0; j < length; j++) {
4267 int original_index = method_ordering->at(j);
4268 guarantee(original_index >= 0, "invalid method ordering index");
4269 guarantee(original_index < length, "invalid method ordering index");
4270 sum += original_index;
4271 }
4272 // Verify sum of indices 0,1,...,length-1
4273 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
4274 } else {
4275 guarantee(length == 0, "invalid method ordering length");
4276 }
4277 }
4278
4279 // Verify default methods
4280 if (default_methods() != nullptr) {
4281 Array<Method*>* methods = this->default_methods();
4282 for (int j = 0; j < methods->length(); j++) {
4283 guarantee(methods->at(j)->is_method(), "non-method in methods array");
4284 }
4285 for (int j = 0; j < methods->length() - 1; j++) {
4286 Method* m1 = methods->at(j);
4287 Method* m2 = methods->at(j + 1);
4288 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
4289 }
4290 }
4291
4292 // Verify JNI static field identifiers
4293 if (jni_ids() != nullptr) {
4294 jni_ids()->verify(this);
4295 }
4296
4297 // Verify other fields
4298 if (constants() != nullptr) {
4299 guarantee(constants()->is_constantPool(), "should be constant pool");
4300 }
4301 }
4302
4303 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
4304 Klass::oop_verify_on(obj, st);
4305 VerifyFieldClosure blk;
4306 obj->oop_iterate(&blk);
4307 }
4308
4309 // JNIid class for jfieldIDs only
4310 // Note to reviewers:
4311 // These JNI functions are just moved over to column 1 and not changed
4312 // in the compressed oops workspace.
4313 JNIid::JNIid(InstanceKlass* holder, int offset, JNIid* next) {
4314 _holder = holder;
4315 _offset = offset;
4316 _next = next;
4317 DEBUG_ONLY(_is_static_field_id = false;)
4318 }
4319
4320 JNIid* JNIid::find(int offset) {
4321 JNIid* current = this;
4322 while (current != nullptr) {
4323 if (current->offset() == offset) return current;
4324 current = current->next();
4325 }
4326 return nullptr;
4327 }
4328
4329 void JNIid::deallocate(JNIid* current) {
4330 while (current != nullptr) {
4331 JNIid* next = current->next();
4332 delete current;
4333 current = next;
4334 }
4335 }
4336
4337 void JNIid::verify(InstanceKlass* holder) {
4338 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields();
4339 int end_field_offset;
4340 end_field_offset = first_field_offset + (holder->static_field_size() * wordSize);
4341
4342 JNIid* current = this;
4343 while (current != nullptr) {
4344 guarantee(current->holder() == holder, "Invalid klass in JNIid");
4345 #ifdef ASSERT
4346 int o = current->offset();
4347 if (current->is_static_field_id()) {
4348 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid");
4349 }
4350 #endif
4351 current = current->next();
4352 }
4353 }
4354
4355 void InstanceKlass::set_init_state(ClassState state) {
4356 #ifdef ASSERT
4357 bool good_state = in_aot_cache() ? (_init_state <= state)
4358 : (_init_state < state);
4359 assert(good_state || state == allocated, "illegal state transition");
4360 #endif
4361 assert(_init_thread == nullptr, "should be cleared before state change");
4362 Atomic::release_store(&_init_state, state);
4363 }
4364
4365 #if INCLUDE_JVMTI
4366
4367 // RedefineClasses() support for previous versions
4368
4369 // Globally, there is at least one previous version of a class to walk
4370 // during class unloading, which is saved because old methods in the class
4371 // are still running. Otherwise the previous version list is cleaned up.
4372 bool InstanceKlass::_should_clean_previous_versions = false;
4373
4374 // Returns true if there are previous versions of a class for class
4375 // unloading only. Also resets the flag to false. purge_previous_version
4376 // will set the flag to true if there are any left, i.e., if there's any
4377 // work to do for next time. This is to avoid the expensive code cache
4378 // walk in CLDG::clean_deallocate_lists().
4379 bool InstanceKlass::should_clean_previous_versions_and_reset() {
4380 bool ret = _should_clean_previous_versions;
4381 log_trace(redefine, class, iklass, purge)("Class unloading: should_clean_previous_versions = %s",
4382 ret ? "true" : "false");
4383 _should_clean_previous_versions = false;
4384 return ret;
4385 }
4386
4387 // This nulls out the jmethodID for all obsolete methods in the previous version of the 'klass'.
4388 // These obsolete methods only exist in the previous version and we're about to delete the memory for them.
4389 // The jmethodID for these are deallocated when we unload the class, so this doesn't remove them from the table.
4390 void InstanceKlass::clear_obsolete_jmethod_ids(InstanceKlass* klass) {
4391 Array<Method*>* method_refs = klass->methods();
4392 for (int k = 0; k < method_refs->length(); k++) {
4393 Method* method = method_refs->at(k);
4394 // Only need to clear obsolete methods.
4395 if (method != nullptr && method->is_obsolete()) {
4396 method->clear_jmethod_id();
4397 }
4398 }
4399 }
4400
4401 // Purge previous versions before adding new previous versions of the class and
4402 // during class unloading.
4403 void InstanceKlass::purge_previous_version_list() {
4404 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
4405 assert(has_been_redefined(), "Should only be called for main class");
4406
4407 // Quick exit.
4408 if (previous_versions() == nullptr) {
4409 return;
4410 }
4411
4412 // This klass has previous versions so see what we can cleanup
4413 // while it is safe to do so.
4414
4415 int deleted_count = 0; // leave debugging breadcrumbs
4416 int live_count = 0;
4417 ClassLoaderData* loader_data = class_loader_data();
4418 assert(loader_data != nullptr, "should never be null");
4419
4420 ResourceMark rm;
4421 log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name());
4422
4423 // previous versions are linked together through the InstanceKlass
4424 InstanceKlass* pv_node = previous_versions();
4425 InstanceKlass* last = this;
4426 int version = 0;
4427
4428 // check the previous versions list
4429 for (; pv_node != nullptr; ) {
4430
4431 ConstantPool* pvcp = pv_node->constants();
4432 assert(pvcp != nullptr, "cp ref was unexpectedly cleared");
4433
4434 if (!pvcp->on_stack()) {
4435 // If the constant pool isn't on stack, none of the methods
4436 // are executing. Unlink this previous_version.
4437 // The previous version InstanceKlass is on the ClassLoaderData deallocate list
4438 // so will be deallocated during the next phase of class unloading.
4439 log_trace(redefine, class, iklass, purge)
4440 ("previous version " PTR_FORMAT " is dead.", p2i(pv_node));
4441 // Unlink from previous version list.
4442 assert(pv_node->class_loader_data() == loader_data, "wrong loader_data");
4443 InstanceKlass* next = pv_node->previous_versions();
4444 clear_obsolete_jmethod_ids(pv_node); // jmethodID maintenance for the unloaded class
4445 pv_node->link_previous_versions(nullptr); // point next to null
4446 last->link_previous_versions(next);
4447 // Delete this node directly. Nothing is referring to it and we don't
4448 // want it to increase the counter for metadata to delete in CLDG.
4449 MetadataFactory::free_metadata(loader_data, pv_node);
4450 pv_node = next;
4451 deleted_count++;
4452 version++;
4453 continue;
4454 } else {
4455 assert(pvcp->pool_holder() != nullptr, "Constant pool with no holder");
4456 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
4457 live_count++;
4458 if (pvcp->in_aot_cache()) {
4459 // Shared previous versions can never be removed so no cleaning is needed.
4460 log_trace(redefine, class, iklass, purge)("previous version " PTR_FORMAT " is shared", p2i(pv_node));
4461 } else {
4462 // Previous version alive, set that clean is needed for next time.
4463 _should_clean_previous_versions = true;
4464 log_trace(redefine, class, iklass, purge)("previous version " PTR_FORMAT " is alive", p2i(pv_node));
4465 }
4466 }
4467
4468 // next previous version
4469 last = pv_node;
4470 pv_node = pv_node->previous_versions();
4471 version++;
4472 }
4473 log_trace(redefine, class, iklass, purge)
4474 ("previous version stats: live=%d, deleted=%d", live_count, deleted_count);
4475 }
4476
4477 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods,
4478 int emcp_method_count) {
4479 int obsolete_method_count = old_methods->length() - emcp_method_count;
4480
4481 if (emcp_method_count != 0 && obsolete_method_count != 0 &&
4482 _previous_versions != nullptr) {
4483 // We have a mix of obsolete and EMCP methods so we have to
4484 // clear out any matching EMCP method entries the hard way.
4485 int local_count = 0;
4486 for (int i = 0; i < old_methods->length(); i++) {
4487 Method* old_method = old_methods->at(i);
4488 if (old_method->is_obsolete()) {
4489 // only obsolete methods are interesting
4490 Symbol* m_name = old_method->name();
4491 Symbol* m_signature = old_method->signature();
4492
4493 // previous versions are linked together through the InstanceKlass
4494 int j = 0;
4495 for (InstanceKlass* prev_version = _previous_versions;
4496 prev_version != nullptr;
4497 prev_version = prev_version->previous_versions(), j++) {
4498
4499 Array<Method*>* method_refs = prev_version->methods();
4500 for (int k = 0; k < method_refs->length(); k++) {
4501 Method* method = method_refs->at(k);
4502
4503 if (!method->is_obsolete() &&
4504 method->name() == m_name &&
4505 method->signature() == m_signature) {
4506 // The current RedefineClasses() call has made all EMCP
4507 // versions of this method obsolete so mark it as obsolete
4508 log_trace(redefine, class, iklass, add)
4509 ("%s(%s): flush obsolete method @%d in version @%d",
4510 m_name->as_C_string(), m_signature->as_C_string(), k, j);
4511
4512 method->set_is_obsolete();
4513 break;
4514 }
4515 }
4516
4517 // The previous loop may not find a matching EMCP method, but
4518 // that doesn't mean that we can optimize and not go any
4519 // further back in the PreviousVersion generations. The EMCP
4520 // method for this generation could have already been made obsolete,
4521 // but there still may be an older EMCP method that has not
4522 // been made obsolete.
4523 }
4524
4525 if (++local_count >= obsolete_method_count) {
4526 // no more obsolete methods so bail out now
4527 break;
4528 }
4529 }
4530 }
4531 }
4532 }
4533
4534 // Save the scratch_class as the previous version if any of the methods are running.
4535 // The previous_versions are used to set breakpoints in EMCP methods and they are
4536 // also used to clean MethodData links to redefined methods that are no longer running.
4537 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class,
4538 int emcp_method_count) {
4539 assert(Thread::current()->is_VM_thread(),
4540 "only VMThread can add previous versions");
4541
4542 ResourceMark rm;
4543 log_trace(redefine, class, iklass, add)
4544 ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count);
4545
4546 // Clean out old previous versions for this class
4547 purge_previous_version_list();
4548
4549 // Mark newly obsolete methods in remaining previous versions. An EMCP method from
4550 // a previous redefinition may be made obsolete by this redefinition.
4551 Array<Method*>* old_methods = scratch_class->methods();
4552 mark_newly_obsolete_methods(old_methods, emcp_method_count);
4553
4554 // If the constant pool for this previous version of the class
4555 // is not marked as being on the stack, then none of the methods
4556 // in this previous version of the class are on the stack so
4557 // we don't need to add this as a previous version.
4558 ConstantPool* cp_ref = scratch_class->constants();
4559 if (!cp_ref->on_stack()) {
4560 log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running");
4561 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class);
4562 return;
4563 }
4564
4565 // Add previous version if any methods are still running or if this is
4566 // a shared class which should never be removed.
4567 assert(scratch_class->previous_versions() == nullptr, "shouldn't have a previous version");
4568 scratch_class->link_previous_versions(previous_versions());
4569 link_previous_versions(scratch_class);
4570 if (cp_ref->in_aot_cache()) {
4571 log_trace(redefine, class, iklass, add) ("scratch class added; class is shared");
4572 } else {
4573 // We only set clean_previous_versions flag for processing during class
4574 // unloading for non-shared classes.
4575 _should_clean_previous_versions = true;
4576 log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack.");
4577 }
4578 } // end add_previous_version()
4579
4580 #endif // INCLUDE_JVMTI
4581
4582 Method* InstanceKlass::method_with_idnum(int idnum) const {
4583 Method* m = nullptr;
4584 if (idnum < methods()->length()) {
4585 m = methods()->at(idnum);
4586 }
4587 if (m == nullptr || m->method_idnum() != idnum) {
4588 for (int index = 0; index < methods()->length(); ++index) {
4589 m = methods()->at(index);
4590 if (m->method_idnum() == idnum) {
4591 return m;
4592 }
4593 }
4594 // None found, return null for the caller to handle.
4595 return nullptr;
4596 }
4597 return m;
4598 }
4599
4600
4601 Method* InstanceKlass::method_with_orig_idnum(int idnum) const {
4602 if (idnum >= methods()->length()) {
4603 return nullptr;
4604 }
4605 Method* m = methods()->at(idnum);
4606 if (m != nullptr && m->orig_method_idnum() == idnum) {
4607 return m;
4608 }
4609 // Obsolete method idnum does not match the original idnum
4610 for (int index = 0; index < methods()->length(); ++index) {
4611 m = methods()->at(index);
4612 if (m->orig_method_idnum() == idnum) {
4613 return m;
4614 }
4615 }
4616 // None found, return null for the caller to handle.
4617 return nullptr;
4618 }
4619
4620
4621 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) const {
4622 const InstanceKlass* holder = get_klass_version(version);
4623 if (holder == nullptr) {
4624 return nullptr; // The version of klass is gone, no method is found
4625 }
4626 return holder->method_with_orig_idnum(idnum);
4627 }
4628
4629 #if INCLUDE_JVMTI
4630 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() {
4631 return _cached_class_file;
4632 }
4633
4634 jint InstanceKlass::get_cached_class_file_len() {
4635 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
4636 }
4637
4638 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
4639 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
4640 }
4641 #endif
4642
4643 // Make a step iterating over the class hierarchy under the root class.
4644 // Skips subclasses if requested.
4645 void ClassHierarchyIterator::next() {
4646 assert(_current != nullptr, "required");
4647 if (_visit_subclasses && _current->subklass() != nullptr) {
4648 _current = _current->subklass();
4649 return; // visit next subclass
4650 }
4651 _visit_subclasses = true; // reset
4652 while (_current->next_sibling() == nullptr && _current != _root) {
4653 _current = _current->java_super(); // backtrack; no more sibling subclasses left
4654 }
4655 if (_current == _root) {
4656 // Iteration is over (back at root after backtracking). Invalidate the iterator.
4657 _current = nullptr;
4658 return;
4659 }
4660 _current = _current->next_sibling();
4661 return; // visit next sibling subclass
4662 }