1 /*
2 * Copyright (c) 1997, 2026, 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/aotLinkedClassBulkLoader.hpp"
27 #include "cds/aotMetaspace.hpp"
28 #include "cds/archiveUtils.hpp"
29 #include "cds/cdsConfig.hpp"
30 #include "cds/cdsEnumKlass.hpp"
31 #include "cds/classListWriter.hpp"
32 #include "cds/heapShared.hpp"
33 #include "classfile/classFileParser.hpp"
34 #include "classfile/classFileStream.hpp"
35 #include "classfile/classLoader.hpp"
36 #include "classfile/classLoaderData.inline.hpp"
37 #include "classfile/javaClasses.hpp"
38 #include "classfile/javaStackTraceClasses.hpp"
39 #include "classfile/moduleEntry.hpp"
40 #include "classfile/systemDictionary.hpp"
41 #include "classfile/systemDictionaryShared.hpp"
42 #include "classfile/verifier.hpp"
43 #include "classfile/vmClasses.hpp"
44 #include "classfile/vmSymbols.hpp"
45 #include "code/codeCache.hpp"
46 #include "code/dependencyContext.hpp"
47 #include "compiler/compilationPolicy.hpp"
48 #include "compiler/compileBroker.hpp"
49 #include "gc/shared/collectedHeap.inline.hpp"
50 #include "interpreter/bytecodeStream.hpp"
51 #include "interpreter/oopMapCache.hpp"
52 #include "interpreter/rewriter.hpp"
53 #include "jvm.h"
54 #include "jvmtifiles/jvmti.h"
55 #include "klass.inline.hpp"
56 #include "logging/log.hpp"
57 #include "logging/logMessage.hpp"
58 #include "logging/logStream.hpp"
59 #include "memory/allocation.inline.hpp"
60 #include "memory/iterator.inline.hpp"
61 #include "memory/metadataFactory.hpp"
62 #include "memory/metaspaceClosure.hpp"
63 #include "memory/oopFactory.hpp"
64 #include "memory/resourceArea.hpp"
65 #include "memory/universe.hpp"
66 #include "oops/constantPool.hpp"
67 #include "oops/fieldStreams.inline.hpp"
68 #include "oops/inlineKlass.hpp"
69 #include "oops/instanceClassLoaderKlass.hpp"
70 #include "oops/instanceKlass.inline.hpp"
71 #include "oops/instanceMirrorKlass.hpp"
72 #include "oops/instanceOop.hpp"
73 #include "oops/instanceStackChunkKlass.hpp"
74 #include "oops/klass.inline.hpp"
75 #include "oops/layoutKind.hpp"
76 #include "oops/markWord.hpp"
77 #include "oops/method.hpp"
78 #include "oops/oop.inline.hpp"
79 #include "oops/recordComponent.hpp"
80 #include "oops/refArrayKlass.hpp"
81 #include "oops/symbol.hpp"
82 #include "prims/jvmtiExport.hpp"
83 #include "prims/jvmtiRedefineClasses.hpp"
84 #include "prims/jvmtiThreadState.hpp"
85 #include "prims/methodComparator.hpp"
86 #include "runtime/arguments.hpp"
87 #include "runtime/atomicAccess.hpp"
88 #include "runtime/deoptimization.hpp"
89 #include "runtime/fieldDescriptor.inline.hpp"
90 #include "runtime/handles.inline.hpp"
91 #include "runtime/javaCalls.hpp"
92 #include "runtime/javaThread.inline.hpp"
93 #include "runtime/mutexLocker.hpp"
94 #include "runtime/orderAccess.hpp"
95 #include "runtime/os.inline.hpp"
96 #include "runtime/reflection.hpp"
97 #include "runtime/synchronizer.hpp"
98 #include "runtime/threads.hpp"
99 #include "services/classLoadingService.hpp"
100 #include "services/finalizerService.hpp"
101 #include "services/threadService.hpp"
102 #include "utilities/dtrace.hpp"
103 #include "utilities/events.hpp"
104 #include "utilities/macros.hpp"
105 #include "utilities/nativeStackPrinter.hpp"
106 #include "utilities/ostream.hpp"
107 #include "utilities/stringUtils.hpp"
108 #ifdef COMPILER1
109 #include "c1/c1_Compiler.hpp"
110 #endif
111 #if INCLUDE_JFR
112 #include "jfr/jfrEvents.hpp"
113 #endif
114
115 #ifdef DTRACE_ENABLED
116
117
118 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED
119 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE
120 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT
121 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS
122 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED
123 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT
124 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR
125 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END
126 #define DTRACE_CLASSINIT_PROBE(type, thread_type) \
127 { \
128 char* data = nullptr; \
129 int len = 0; \
130 Symbol* clss_name = name(); \
131 if (clss_name != nullptr) { \
132 data = (char*)clss_name->bytes(); \
133 len = clss_name->utf8_length(); \
134 } \
135 HOTSPOT_CLASS_INITIALIZATION_##type( \
136 data, len, (void*)class_loader(), thread_type); \
137 }
138
139 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) \
140 { \
141 char* data = nullptr; \
142 int len = 0; \
143 Symbol* clss_name = name(); \
144 if (clss_name != nullptr) { \
145 data = (char*)clss_name->bytes(); \
146 len = clss_name->utf8_length(); \
147 } \
148 HOTSPOT_CLASS_INITIALIZATION_##type( \
149 data, len, (void*)class_loader(), thread_type, wait); \
150 }
151
152 #else // ndef DTRACE_ENABLED
153
154 #define DTRACE_CLASSINIT_PROBE(type, thread_type)
155 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait)
156
157 #endif // ndef DTRACE_ENABLED
158
159 void InlineLayoutInfo::metaspace_pointers_do(MetaspaceClosure* it) {
160 log_trace(cds)("Iter(InlineFieldInfo): %p", this);
161 it->push(&_klass);
162 }
163
164 void InlineLayoutInfo::print() const {
165 print_on(tty);
166 }
167
168 void InlineLayoutInfo::print_on(outputStream* st) const {
169 st->print_cr("_klass: " PTR_FORMAT, p2i(_klass));
170 if (_klass != nullptr) {
171 StreamIndentor si(st);
172 _klass->print_on(st);
173 st->cr();
174 }
175
176 st->print("_layout: ");
177 LayoutKindHelper::print_on(_kind, st);
178 st->cr();
179
180 st->print("_null_marker_offset: %d", _null_marker_offset);
181 }
182
183 // A value class is considered naturally atomic if its layout,
184 // once all fields flattening have been applied, contains a single primitive
185 // or oop field. Because primitive types and oops are already handled
186 // atomically by the JVM, it means that there's no need to take
187 // special precautions when reading or writing this value to guarantee
188 // cross-fields invariants. Nullability has to be taken into consideration,
189 // as the null-marker has to be considered as a pseudo-field which must
190 // be kept consistent with the payload. The only kind of value class
191 // that can be considered naturally atomic when nullable is the empty
192 // value classes because the dummy field is re-used as a null-marker.
193 bool InstanceKlass::is_naturally_atomic(bool null_free) const {
194 assert(!is_identity_class(), "Doesn't make sense for an identity class");
195 if (null_free) {
196 // No extra null-marker, just check the layout of the fields
197 return _misc_flags.is_naturally_atomic();
198 } else {
199 // Requires a null-marker, can't have any other fields
200 return InlineKlass::cast(this)->is_empty_inline_type();
201 }
202 }
203
204 bool InstanceKlass::_finalization_enabled = true;
205 static int call_class_initializer_counter = 0; // for debugging
206
207 static inline bool is_class_loader(const Symbol* class_name,
208 const ClassFileParser& parser) {
209 assert(class_name != nullptr, "invariant");
210
211 if (class_name == vmSymbols::java_lang_ClassLoader()) {
212 return true;
213 }
214
215 if (vmClasses::ClassLoader_klass_is_loaded()) {
216 const Klass* const super_klass = parser.super_klass();
217 if (super_klass != nullptr) {
218 if (super_klass->is_subtype_of(vmClasses::ClassLoader_klass())) {
219 return true;
220 }
221 }
222 }
223 return false;
224 }
225
226 bool InstanceKlass::field_is_null_free_inline_type(int index) const {
227 return field(index).field_flags().is_null_free_inline_type();
228 }
229
230 bool InstanceKlass::is_class_in_loadable_descriptors_attribute(Symbol* name) const {
231 if (_loadable_descriptors == nullptr) return false;
232 for (int i = 0; i < _loadable_descriptors->length(); i++) {
233 Symbol* class_name = _constants->symbol_at(_loadable_descriptors->at(i));
234 if (class_name == name) return true;
235 }
236 return false;
237 }
238
239 static inline bool is_stack_chunk_class(const Symbol* class_name,
240 const ClassLoaderData* loader_data) {
241 return (class_name == vmSymbols::jdk_internal_vm_StackChunk() &&
242 loader_data->is_the_null_class_loader_data());
243 }
244
245 // private: called to verify that k is a static member of this nest.
246 // We know that k is an instance class in the same package and hence the
247 // same classloader.
248 bool InstanceKlass::has_nest_member(JavaThread* current, InstanceKlass* k) const {
249 assert(!is_hidden(), "unexpected hidden class");
250 if (_nest_members == nullptr || _nest_members == Universe::the_empty_short_array()) {
251 if (log_is_enabled(Trace, class, nestmates)) {
252 ResourceMark rm(current);
253 log_trace(class, nestmates)("Checked nest membership of %s in non-nest-host class %s",
254 k->external_name(), this->external_name());
255 }
256 return false;
257 }
258
259 if (log_is_enabled(Trace, class, nestmates)) {
260 ResourceMark rm(current);
261 log_trace(class, nestmates)("Checking nest membership of %s in %s",
262 k->external_name(), this->external_name());
263 }
264
265 // Check for the named class in _nest_members.
266 // We don't resolve, or load, any classes.
267 for (int i = 0; i < _nest_members->length(); i++) {
268 int cp_index = _nest_members->at(i);
269 Symbol* name = _constants->klass_name_at(cp_index);
270 if (name == k->name()) {
271 log_trace(class, nestmates)("- named class found at nest_members[%d] => cp[%d]", i, cp_index);
272 return true;
273 }
274 }
275 log_trace(class, nestmates)("- class is NOT a nest member!");
276 return false;
277 }
278
279 // Called to verify that k is a permitted subclass of this class.
280 // The incoming stringStream is used to format the messages for error logging and for the caller
281 // to use for exception throwing.
282 bool InstanceKlass::has_as_permitted_subclass(const InstanceKlass* k, stringStream& ss) const {
283 Thread* current = Thread::current();
284 assert(k != nullptr, "sanity check");
285 assert(_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array(),
286 "unexpected empty _permitted_subclasses array");
287
288 if (log_is_enabled(Trace, class, sealed)) {
289 ResourceMark rm(current);
290 log_trace(class, sealed)("Checking for permitted subclass %s in %s",
291 k->external_name(), this->external_name());
292 }
293
294 // Check that the class and its super are in the same module.
295 if (k->module() != this->module()) {
296 ss.print("Failed same module check: subclass %s is in module '%s' with loader %s, "
297 "and sealed class %s is in module '%s' with loader %s",
298 k->external_name(),
299 k->module()->name_as_C_string(),
300 k->module()->loader_data()->loader_name_and_id(),
301 this->external_name(),
302 this->module()->name_as_C_string(),
303 this->module()->loader_data()->loader_name_and_id());
304 log_trace(class, sealed)(" - %s", ss.as_string());
305 return false;
306 }
307
308 if (!k->is_public() && !is_same_class_package(k)) {
309 ss.print("Failed same package check: non-public subclass %s is in package '%s' with classloader %s, "
310 "and sealed class %s is in package '%s' with classloader %s",
311 k->external_name(),
312 k->package() != nullptr ? k->package()->name()->as_C_string() : "unnamed",
313 k->module()->loader_data()->loader_name_and_id(),
314 this->external_name(),
315 this->package() != nullptr ? this->package()->name()->as_C_string() : "unnamed",
316 this->module()->loader_data()->loader_name_and_id());
317 log_trace(class, sealed)(" - %s", ss.as_string());
318 return false;
319 }
320
321 for (int i = 0; i < _permitted_subclasses->length(); i++) {
322 int cp_index = _permitted_subclasses->at(i);
323 Symbol* name = _constants->klass_name_at(cp_index);
324 if (name == k->name()) {
325 log_trace(class, sealed)("- Found it at permitted_subclasses[%d] => cp[%d]", i, cp_index);
326 return true;
327 }
328 }
329
330 ss.print("Failed listed permitted subclass check: class %s is not a permitted subclass of %s",
331 k->external_name(), this->external_name());
332 log_trace(class, sealed)(" - %s", ss.as_string());
333 return false;
334 }
335
336 // Return nest-host class, resolving, validating and saving it if needed.
337 // In cases where this is called from a thread that cannot do classloading
338 // (such as a native JIT thread) then we simply return null, which in turn
339 // causes the access check to return false. Such code will retry the access
340 // from a more suitable environment later. Otherwise the _nest_host is always
341 // set once this method returns.
342 // Any errors from nest-host resolution must be preserved so they can be queried
343 // from higher-level access checking code, and reported as part of access checking
344 // exceptions.
345 // VirtualMachineErrors are propagated with a null return.
346 // Under any conditions where the _nest_host can be set to non-null the resulting
347 // value of it and, if applicable, the nest host resolution/validation error,
348 // are idempotent.
349 InstanceKlass* InstanceKlass::nest_host(TRAPS) {
350 InstanceKlass* nest_host_k = _nest_host;
351 if (nest_host_k != nullptr) {
352 return nest_host_k;
353 }
354
355 ResourceMark rm(THREAD);
356
357 // need to resolve and save our nest-host class.
358 if (_nest_host_index != 0) { // we have a real nest_host
359 // Before trying to resolve check if we're in a suitable context
360 bool can_resolve = THREAD->can_call_java();
361 if (!can_resolve && !_constants->tag_at(_nest_host_index).is_klass()) {
362 log_trace(class, nestmates)("Rejected resolution of nest-host of %s in unsuitable thread",
363 this->external_name());
364 return nullptr; // sentinel to say "try again from a different context"
365 }
366
367 log_trace(class, nestmates)("Resolving nest-host of %s using cp entry for %s",
368 this->external_name(),
369 _constants->klass_name_at(_nest_host_index)->as_C_string());
370
371 Klass* k = _constants->klass_at(_nest_host_index, THREAD);
372 if (HAS_PENDING_EXCEPTION) {
373 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
374 return nullptr; // propagate VMEs
375 }
376 stringStream ss;
377 char* target_host_class = _constants->klass_name_at(_nest_host_index)->as_C_string();
378 ss.print("Nest host resolution of %s with host %s failed: ",
379 this->external_name(), target_host_class);
380 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
381 constantPoolHandle cph(THREAD, constants());
382 SystemDictionary::add_nest_host_error(cph, _nest_host_index, ss);
383 CLEAR_PENDING_EXCEPTION;
384
385 log_trace(class, nestmates)("%s", ss.base());
386 } else {
387 // A valid nest-host is an instance class in the current package that lists this
388 // class as a nest member. If any of these conditions are not met the class is
389 // its own nest-host.
390 const char* error = nullptr;
391
392 // JVMS 5.4.4 indicates package check comes first
393 if (is_same_class_package(k)) {
394 // Now check actual membership. We can't be a member if our "host" is
395 // not an instance class.
396 if (k->is_instance_klass()) {
397 nest_host_k = InstanceKlass::cast(k);
398 bool is_member = nest_host_k->has_nest_member(THREAD, this);
399 if (is_member) {
400 _nest_host = nest_host_k; // save resolved nest-host value
401
402 log_trace(class, nestmates)("Resolved nest-host of %s to %s",
403 this->external_name(), k->external_name());
404 return nest_host_k;
405 } else {
406 error = "current type is not listed as a nest member";
407 }
408 } else {
409 error = "host is not an instance class";
410 }
411 } else {
412 error = "types are in different packages";
413 }
414
415 // something went wrong, so record what and log it
416 {
417 stringStream ss;
418 ss.print("Type %s (loader: %s) is not a nest member of type %s (loader: %s): %s",
419 this->external_name(),
420 this->class_loader_data()->loader_name_and_id(),
421 k->external_name(),
422 k->class_loader_data()->loader_name_and_id(),
423 error);
424 constantPoolHandle cph(THREAD, constants());
425 SystemDictionary::add_nest_host_error(cph, _nest_host_index, ss);
426 log_trace(class, nestmates)("%s", ss.base());
427 }
428 }
429 } else {
430 log_trace(class, nestmates)("Type %s is not part of a nest: setting nest-host to self",
431 this->external_name());
432 }
433
434 // Either not in an explicit nest, or else an error occurred, so
435 // the nest-host is set to `this`. Any thread that sees this assignment
436 // will also see any setting of nest_host_error(), if applicable.
437 return (_nest_host = this);
438 }
439
440 // Dynamic nest member support: set this class's nest host to the given class.
441 // This occurs as part of the class definition, as soon as the instanceKlass
442 // has been created and doesn't require further resolution. The code:
443 // lookup().defineHiddenClass(bytes_for_X, NESTMATE);
444 // results in:
445 // class_of_X.set_nest_host(lookup().lookupClass().getNestHost())
446 // If it has an explicit _nest_host_index or _nest_members, these will be ignored.
447 // We also know the "host" is a valid nest-host in the same package so we can
448 // assert some of those facts.
449 void InstanceKlass::set_nest_host(InstanceKlass* host) {
450 assert(is_hidden(), "must be a hidden class");
451 assert(host != nullptr, "null nest host specified");
452 assert(_nest_host == nullptr, "current class has resolved nest-host");
453 assert(nest_host_error() == nullptr, "unexpected nest host resolution error exists: %s",
454 nest_host_error());
455 assert((host->_nest_host == nullptr && host->_nest_host_index == 0) ||
456 (host->_nest_host == host), "proposed host is not a valid nest-host");
457 // Can't assert this as package is not set yet:
458 // assert(is_same_class_package(host), "proposed host is in wrong package");
459
460 if (log_is_enabled(Trace, class, nestmates)) {
461 ResourceMark rm;
462 const char* msg = "";
463 // a hidden class does not expect a statically defined nest-host
464 if (_nest_host_index > 0) {
465 msg = "(the NestHost attribute in the current class is ignored)";
466 } else if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
467 msg = "(the NestMembers attribute in the current class is ignored)";
468 }
469 log_trace(class, nestmates)("Injected type %s into the nest of %s %s",
470 this->external_name(),
471 host->external_name(),
472 msg);
473 }
474 // set dynamic nest host
475 _nest_host = host;
476 // Record dependency to keep nest host from being unloaded before this class.
477 ClassLoaderData* this_key = class_loader_data();
478 assert(this_key != nullptr, "sanity");
479 this_key->record_dependency(host);
480 }
481
482 // check if 'this' and k are nestmates (same nest_host), or k is our nest_host,
483 // or we are k's nest_host - all of which is covered by comparing the two
484 // resolved_nest_hosts.
485 // Any exceptions (i.e. VMEs) are propagated.
486 bool InstanceKlass::has_nestmate_access_to(InstanceKlass* k, TRAPS) {
487
488 assert(this != k, "this should be handled by higher-level code");
489
490 // Per JVMS 5.4.4 we first resolve and validate the current class, then
491 // the target class k.
492
493 InstanceKlass* cur_host = nest_host(CHECK_false);
494 if (cur_host == nullptr) {
495 return false;
496 }
497
498 Klass* k_nest_host = k->nest_host(CHECK_false);
499 if (k_nest_host == nullptr) {
500 return false;
501 }
502
503 bool access = (cur_host == k_nest_host);
504
505 ResourceMark rm(THREAD);
506 log_trace(class, nestmates)("Class %s does %shave nestmate access to %s",
507 this->external_name(),
508 access ? "" : "NOT ",
509 k->external_name());
510 return access;
511 }
512
513 const char* InstanceKlass::nest_host_error() {
514 if (_nest_host_index == 0) {
515 return nullptr;
516 } else {
517 constantPoolHandle cph(Thread::current(), constants());
518 return SystemDictionary::find_nest_host_error(cph, (int)_nest_host_index);
519 }
520 }
521
522 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) {
523 const int size = InstanceKlass::size(parser.vtable_size(),
524 parser.itable_size(),
525 nonstatic_oop_map_size(parser.total_oop_map_count()),
526 parser.is_interface(),
527 parser.is_inline_type());
528
529 const Symbol* const class_name = parser.class_name();
530 assert(class_name != nullptr, "invariant");
531 ClassLoaderData* loader_data = parser.loader_data();
532 assert(loader_data != nullptr, "invariant");
533
534 InstanceKlass* ik;
535
536 // Allocation
537 if (parser.is_instance_ref_klass()) {
538 // java.lang.ref.Reference
539 ik = new (loader_data, size, THREAD) InstanceRefKlass(parser);
540 } else if (class_name == vmSymbols::java_lang_Class()) {
541 // mirror - java.lang.Class
542 ik = new (loader_data, size, THREAD) InstanceMirrorKlass(parser);
543 } else if (is_stack_chunk_class(class_name, loader_data)) {
544 // stack chunk
545 ik = new (loader_data, size, THREAD) InstanceStackChunkKlass(parser);
546 } else if (is_class_loader(class_name, parser)) {
547 // class loader - java.lang.ClassLoader
548 ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser);
549 } else if (parser.is_inline_type()) {
550 // inline type
551 ik = new (loader_data, size, THREAD) InlineKlass(parser);
552 } else {
553 // normal
554 ik = new (loader_data, size, THREAD) InstanceKlass(parser);
555 }
556
557 assert(ik == nullptr || CompressedKlassPointers::is_encodable(ik),
558 "Klass " PTR_FORMAT "needs a narrow Klass ID, but is not encodable", p2i(ik));
559
560 // Check for pending exception before adding to the loader data and incrementing
561 // class count. Can get OOM here.
562 if (HAS_PENDING_EXCEPTION) {
563 return nullptr;
564 }
565
566 return ik;
567 }
568
569 // copy method ordering from resource area to Metaspace
570 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) {
571 if (m != nullptr) {
572 // allocate a new array and copy contents (memcpy?)
573 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
574 for (int i = 0; i < m->length(); i++) {
575 _method_ordering->at_put(i, m->at(i));
576 }
577 } else {
578 _method_ordering = Universe::the_empty_int_array();
579 }
580 }
581
582 // create a new array of vtable_indices for default methods
583 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
584 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
585 assert(default_vtable_indices() == nullptr, "only create once");
586 set_default_vtable_indices(vtable_indices);
587 return vtable_indices;
588 }
589
590
591 InstanceKlass::InstanceKlass() {
592 assert(CDSConfig::is_dumping_static_archive() || CDSConfig::is_using_archive(), "only for CDS");
593 }
594
595 InstanceKlass::InstanceKlass(const ClassFileParser& parser, KlassKind kind, markWord prototype_header, ReferenceType reference_type) :
596 Klass(kind, prototype_header),
597 _nest_members(nullptr),
598 _nest_host(nullptr),
599 _permitted_subclasses(nullptr),
600 _record_components(nullptr),
601 _static_field_size(parser.static_field_size()),
602 _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())),
603 _itable_len(parser.itable_size()),
604 _nest_host_index(0),
605 _init_state(allocated),
606 _reference_type(reference_type),
607 _acmp_maps_offset(0),
608 _init_thread(nullptr),
609 _inline_layout_info_array(nullptr),
610 _loadable_descriptors(nullptr),
611 _acmp_maps_array(nullptr),
612 _adr_inline_klass_members(nullptr)
613 {
614 set_vtable_length(parser.vtable_size());
615 set_access_flags(parser.access_flags());
616 if (parser.is_hidden()) set_is_hidden();
617 set_layout_helper(Klass::instance_layout_helper(parser.layout_size(),
618 false));
619 if (parser.has_inlined_fields()) {
620 set_has_inlined_fields();
621 }
622
623 assert(nullptr == _methods, "underlying memory not zeroed?");
624 assert(is_instance_klass(), "is layout incorrect?");
625 assert(size_helper() == parser.layout_size(), "incorrect size_helper?");
626 }
627
628 void InstanceKlass::set_is_cloneable() {
629 if (name() == vmSymbols::java_lang_invoke_MemberName()) {
630 assert(is_final(), "no subclasses allowed");
631 // MemberName cloning should not be intrinsified and always happen in JVM_Clone.
632 } else if (reference_type() != REF_NONE) {
633 // Reference cloning should not be intrinsified and always happen in JVM_Clone.
634 } else {
635 set_is_cloneable_fast();
636 }
637 }
638
639 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
640 Array<Method*>* methods) {
641 if (methods != nullptr && methods != Universe::the_empty_method_array() &&
642 !methods->in_aot_cache()) {
643 for (int i = 0; i < methods->length(); i++) {
644 Method* method = methods->at(i);
645 if (method == nullptr) continue; // maybe null if error processing
646 // Only want to delete methods that are not executing for RedefineClasses.
647 // The previous version will point to them so they're not totally dangling
648 assert (!method->on_stack(), "shouldn't be called with methods on stack");
649 MetadataFactory::free_metadata(loader_data, method);
650 }
651 MetadataFactory::free_array<Method*>(loader_data, methods);
652 }
653 }
654
655 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
656 const InstanceKlass* super_klass,
657 Array<InstanceKlass*>* local_interfaces,
658 Array<InstanceKlass*>* transitive_interfaces) {
659 // Only deallocate transitive interfaces if not empty, same as super class
660 // or same as local interfaces. See code in parseClassFile.
661 Array<InstanceKlass*>* ti = transitive_interfaces;
662 if (ti != Universe::the_empty_instance_klass_array() && ti != local_interfaces) {
663 // check that the interfaces don't come from super class
664 Array<InstanceKlass*>* sti = (super_klass == nullptr) ? nullptr :
665 super_klass->transitive_interfaces();
666 if (ti != sti && ti != nullptr && !ti->in_aot_cache()) {
667 MetadataFactory::free_array<InstanceKlass*>(loader_data, ti);
668 }
669 }
670
671 // local interfaces can be empty
672 if (local_interfaces != Universe::the_empty_instance_klass_array() &&
673 local_interfaces != nullptr && !local_interfaces->in_aot_cache()) {
674 MetadataFactory::free_array<InstanceKlass*>(loader_data, local_interfaces);
675 }
676 }
677
678 void InstanceKlass::deallocate_record_components(ClassLoaderData* loader_data,
679 Array<RecordComponent*>* record_components) {
680 if (record_components != nullptr && !record_components->in_aot_cache()) {
681 for (int i = 0; i < record_components->length(); i++) {
682 RecordComponent* record_component = record_components->at(i);
683 MetadataFactory::free_metadata(loader_data, record_component);
684 }
685 MetadataFactory::free_array<RecordComponent*>(loader_data, record_components);
686 }
687 }
688
689 // This function deallocates the metadata and C heap pointers that the
690 // InstanceKlass points to.
691 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
692 // Orphan the mirror first, CMS thinks it's still live.
693 if (java_mirror() != nullptr) {
694 java_lang_Class::set_klass(java_mirror(), nullptr);
695 }
696
697 // Also remove mirror from handles
698 loader_data->remove_handle(_java_mirror);
699
700 // Need to take this class off the class loader data list.
701 loader_data->remove_class(this);
702
703 // The array_klass for this class is created later, after error handling.
704 // For class redefinition, we keep the original class so this scratch class
705 // doesn't have an array class. Either way, assert that there is nothing
706 // to deallocate.
707 assert(array_klasses() == nullptr, "array classes shouldn't be created for this class yet");
708
709 // Release C heap allocated data that this points to, which includes
710 // reference counting symbol names.
711 // Can't release the constant pool or MethodData C heap data here because the constant
712 // pool can be deallocated separately from the InstanceKlass for default methods and
713 // redefine classes. MethodData can also be released separately.
714 release_C_heap_structures(/* release_sub_metadata */ false);
715
716 deallocate_methods(loader_data, methods());
717 set_methods(nullptr);
718
719 deallocate_record_components(loader_data, record_components());
720 set_record_components(nullptr);
721
722 if (method_ordering() != nullptr &&
723 method_ordering() != Universe::the_empty_int_array() &&
724 !method_ordering()->in_aot_cache()) {
725 MetadataFactory::free_array<int>(loader_data, method_ordering());
726 }
727 set_method_ordering(nullptr);
728
729 // default methods can be empty
730 if (default_methods() != nullptr &&
731 default_methods() != Universe::the_empty_method_array() &&
732 !default_methods()->in_aot_cache()) {
733 MetadataFactory::free_array<Method*>(loader_data, default_methods());
734 }
735 // Do NOT deallocate the default methods, they are owned by superinterfaces.
736 set_default_methods(nullptr);
737
738 // default methods vtable indices can be empty
739 if (default_vtable_indices() != nullptr &&
740 !default_vtable_indices()->in_aot_cache()) {
741 MetadataFactory::free_array<int>(loader_data, default_vtable_indices());
742 }
743 set_default_vtable_indices(nullptr);
744
745
746 // This array is in Klass, but remove it with the InstanceKlass since
747 // this place would be the only caller and it can share memory with transitive
748 // interfaces.
749 if (secondary_supers() != nullptr &&
750 secondary_supers() != Universe::the_empty_klass_array() &&
751 // see comments in compute_secondary_supers about the following cast
752 (address)(secondary_supers()) != (address)(transitive_interfaces()) &&
753 !secondary_supers()->in_aot_cache()) {
754 MetadataFactory::free_array<Klass*>(loader_data, secondary_supers());
755 }
756 set_secondary_supers(nullptr, SECONDARY_SUPERS_BITMAP_EMPTY);
757
758 deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces());
759 set_transitive_interfaces(nullptr);
760 set_local_interfaces(nullptr);
761
762 if (fieldinfo_stream() != nullptr && !fieldinfo_stream()->in_aot_cache()) {
763 MetadataFactory::free_array<u1>(loader_data, fieldinfo_stream());
764 }
765 set_fieldinfo_stream(nullptr);
766
767 if (fieldinfo_search_table() != nullptr && !fieldinfo_search_table()->in_aot_cache()) {
768 MetadataFactory::free_array<u1>(loader_data, fieldinfo_search_table());
769 }
770 set_fieldinfo_search_table(nullptr);
771
772 if (fields_status() != nullptr && !fields_status()->in_aot_cache()) {
773 MetadataFactory::free_array<FieldStatus>(loader_data, fields_status());
774 }
775 set_fields_status(nullptr);
776
777 if (inline_layout_info_array() != nullptr) {
778 MetadataFactory::free_array<InlineLayoutInfo>(loader_data, inline_layout_info_array());
779 }
780 set_inline_layout_info_array(nullptr);
781
782 // If a method from a redefined class is using this constant pool, don't
783 // delete it, yet. The new class's previous version will point to this.
784 if (constants() != nullptr) {
785 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack");
786 if (!constants()->in_aot_cache()) {
787 HeapShared::remove_scratch_resolved_references(constants());
788 MetadataFactory::free_metadata(loader_data, constants());
789 }
790 // Delete any cached resolution errors for the constant pool
791 SystemDictionary::delete_resolution_error(constants());
792
793 set_constants(nullptr);
794 }
795
796 if (inner_classes() != nullptr &&
797 inner_classes() != Universe::the_empty_short_array() &&
798 !inner_classes()->in_aot_cache()) {
799 MetadataFactory::free_array<jushort>(loader_data, inner_classes());
800 }
801 set_inner_classes(nullptr);
802
803 if (nest_members() != nullptr &&
804 nest_members() != Universe::the_empty_short_array() &&
805 !nest_members()->in_aot_cache()) {
806 MetadataFactory::free_array<jushort>(loader_data, nest_members());
807 }
808 set_nest_members(nullptr);
809
810 if (permitted_subclasses() != nullptr &&
811 permitted_subclasses() != Universe::the_empty_short_array() &&
812 !permitted_subclasses()->in_aot_cache()) {
813 MetadataFactory::free_array<jushort>(loader_data, permitted_subclasses());
814 }
815 set_permitted_subclasses(nullptr);
816
817 if (loadable_descriptors() != nullptr &&
818 loadable_descriptors() != Universe::the_empty_short_array() &&
819 !loadable_descriptors()->in_aot_cache()) {
820 MetadataFactory::free_array<jushort>(loader_data, loadable_descriptors());
821 }
822 set_loadable_descriptors(nullptr);
823
824 if (acmp_maps_array() != nullptr) {
825 MetadataFactory::free_array<int>(loader_data, acmp_maps_array());
826 }
827 set_acmp_maps_array(nullptr);
828
829 // We should deallocate the Annotations instance if it's not in shared spaces.
830 if (annotations() != nullptr && !annotations()->in_aot_cache()) {
831 MetadataFactory::free_metadata(loader_data, annotations());
832 }
833 set_annotations(nullptr);
834
835 SystemDictionaryShared::handle_class_unloading(this);
836
837 #if INCLUDE_CDS_JAVA_HEAP
838 if (CDSConfig::is_dumping_heap()) {
839 HeapShared::remove_scratch_objects(this);
840 }
841 #endif
842 }
843
844 bool InstanceKlass::is_record() const {
845 return _record_components != nullptr &&
846 is_final() &&
847 super() == vmClasses::Record_klass();
848 }
849
850 bool InstanceKlass::is_sealed() const {
851 return _permitted_subclasses != nullptr &&
852 _permitted_subclasses != Universe::the_empty_short_array();
853 }
854
855 // JLS 8.9: An enum class is either implicitly final and derives
856 // from java.lang.Enum, or else is implicitly sealed to its
857 // anonymous subclasses. This query detects both kinds.
858 // It does not validate the finality or
859 // sealing conditions: it merely checks for a super of Enum.
860 // This is sufficient for recognizing well-formed enums.
861 bool InstanceKlass::is_enum_subclass() const {
862 InstanceKlass* s = super();
863 return (s == vmClasses::Enum_klass() ||
864 (s != nullptr && s->super() == vmClasses::Enum_klass()));
865 }
866
867 bool InstanceKlass::should_be_initialized() const {
868 return !is_initialized();
869 }
870
871 // Static size helper
872 int InstanceKlass::size(int vtable_length,
873 int itable_length,
874 int nonstatic_oop_map_size,
875 bool is_interface,
876 bool is_inline_type) {
877 return align_metadata_size(header_size() +
878 vtable_length +
879 itable_length +
880 nonstatic_oop_map_size +
881 (is_interface ? (int)sizeof(Klass*) / wordSize : 0) +
882 (is_inline_type ? (int)sizeof(InlineKlass::Members) / wordSize : 0));
883 }
884
885 int InstanceKlass::size() const {
886 return size(vtable_length(),
887 itable_length(),
888 nonstatic_oop_map_size(),
889 is_interface(),
890 is_inline_klass());
891 }
892
893 klassItable InstanceKlass::itable() const {
894 return klassItable(const_cast<InstanceKlass*>(this));
895 }
896
897 // JVMTI spec thinks there are signers and protection domain in the
898 // instanceKlass. These accessors pretend these fields are there.
899 // The hprof specification also thinks these fields are in InstanceKlass.
900 oop InstanceKlass::protection_domain() const {
901 // return the protection_domain from the mirror
902 return java_lang_Class::protection_domain(java_mirror());
903 }
904
905 objArrayOop InstanceKlass::signers() const {
906 // return the signers from the mirror
907 return java_lang_Class::signers(java_mirror());
908 }
909
910 oop InstanceKlass::init_lock() const {
911 // return the init lock from the mirror
912 oop lock = java_lang_Class::init_lock(java_mirror());
913 // Prevent reordering with any access of initialization state
914 OrderAccess::loadload();
915 assert(lock != nullptr || !is_not_initialized(), // initialized or in_error state
916 "only fully initialized state can have a null lock");
917 return lock;
918 }
919
920 // Set the initialization lock to null so the object can be GC'ed. Any racing
921 // threads to get this lock will see a null lock and will not lock.
922 // That's okay because they all check for initialized state after getting
923 // the lock and return. For preempted vthreads we keep the oop protected
924 // in the ObjectMonitor (see ObjectMonitor::set_object_strong()).
925 void InstanceKlass::fence_and_clear_init_lock() {
926 // make sure previous stores are all done, notably the init_state.
927 OrderAccess::storestore();
928 java_lang_Class::clear_init_lock(java_mirror());
929 assert(!is_not_initialized(), "class must be initialized now");
930 }
931
932 class PreemptableInitCall {
933 JavaThread* _thread;
934 bool _previous;
935 DEBUG_ONLY(InstanceKlass* _previous_klass;)
936 public:
937 PreemptableInitCall(JavaThread* thread, InstanceKlass* ik) : _thread(thread) {
938 _previous = thread->at_preemptable_init();
939 _thread->set_at_preemptable_init(true);
940 DEBUG_ONLY(_previous_klass = _thread->preempt_init_klass();)
941 DEBUG_ONLY(_thread->set_preempt_init_klass(ik));
942 }
943 ~PreemptableInitCall() {
944 _thread->set_at_preemptable_init(_previous);
945 DEBUG_ONLY(_thread->set_preempt_init_klass(_previous_klass));
946 }
947 };
948
949 void InstanceKlass::initialize_preemptable(TRAPS) {
950 if (this->should_be_initialized()) {
951 PreemptableInitCall pic(THREAD, this);
952 initialize_impl(THREAD);
953 } else {
954 assert(is_initialized(), "sanity check");
955 }
956 }
957
958 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization
959 // process. The step comments refers to the procedure described in that section.
960 // Note: implementation moved to static method to expose the this pointer.
961 void InstanceKlass::initialize(TRAPS) {
962 if (this->should_be_initialized()) {
963 initialize_impl(CHECK);
964 // Note: at this point the class may be initialized
965 // OR it may be in the state of being initialized
966 // in case of recursive initialization!
967 } else {
968 assert(is_initialized(), "sanity check");
969 }
970 }
971
972 #ifdef ASSERT
973 void InstanceKlass::assert_no_clinit_will_run_for_aot_initialized_class() const {
974 assert(has_aot_initialized_mirror(), "must be");
975
976 InstanceKlass* s = super();
977 if (s != nullptr) {
978 DEBUG_ONLY(ResourceMark rm);
979 assert(s->is_initialized(), "super class %s of aot-inited class %s must have been initialized",
980 s->external_name(), external_name());
981 s->assert_no_clinit_will_run_for_aot_initialized_class();
982 }
983
984 Array<InstanceKlass*>* interfaces = local_interfaces();
985 int len = interfaces->length();
986 for (int i = 0; i < len; i++) {
987 InstanceKlass* intf = interfaces->at(i);
988 if (!intf->is_initialized()) {
989 ResourceMark rm;
990 // Note: an interface needs to be marked as is_initialized() only if
991 // - it has a <clinit>
992 // - it has declared a default method.
993 assert(!intf->interface_needs_clinit_execution_as_super(/*also_check_supers*/false),
994 "uninitialized super interface %s of aot-inited class %s must not have <clinit>",
995 intf->external_name(), external_name());
996 }
997 }
998 }
999 #endif
1000
1001 #if INCLUDE_CDS
1002 // early_init -- we are moving this class into the fully_initialized state before the
1003 // JVM is able to execute any bytecodes. See AOTLinkedClassBulkLoader::is_initializing_classes_early().
1004 void InstanceKlass::initialize_with_aot_initialized_mirror(bool early_init, TRAPS) {
1005 assert(has_aot_initialized_mirror(), "must be");
1006 assert(CDSConfig::is_loading_heap(), "must be");
1007 assert(CDSConfig::is_using_aot_linked_classes(), "must be");
1008 assert_no_clinit_will_run_for_aot_initialized_class();
1009
1010 if (is_initialized()) {
1011 return;
1012 }
1013
1014 if (log_is_enabled(Info, aot, init)) {
1015 ResourceMark rm;
1016 log_info(aot, init)("%s (aot-inited%s)", external_name(), early_init ? ", early" : "");
1017 }
1018
1019 if (is_runtime_setup_required()) {
1020 assert(!early_init, "must not call");
1021 // Need to take the slow path, which will call the runtimeSetup() function instead
1022 // of <clinit>
1023 initialize(CHECK);
1024 return;
1025 }
1026
1027 LogTarget(Info, class, init) lt;
1028 if (lt.is_enabled()) {
1029 ResourceMark rm(THREAD);
1030 LogStream ls(lt);
1031 ls.print("%d Initializing ", call_class_initializer_counter++);
1032 name()->print_value_on(&ls);
1033 ls.print_cr("(aot-inited) (" PTR_FORMAT ") by thread \"%s\"",
1034 p2i(this), THREAD->name());
1035 }
1036
1037 if (early_init) {
1038 precond(AOTLinkedClassBulkLoader::is_initializing_classes_early());
1039 precond(is_linked());
1040 precond(init_thread() == nullptr);
1041 set_init_state(fully_initialized);
1042 fence_and_clear_init_lock();
1043 return;
1044 }
1045
1046 link_class(CHECK);
1047
1048 #ifdef ASSERT
1049 {
1050 Handle h_init_lock(THREAD, init_lock());
1051 ObjectLocker ol(h_init_lock, THREAD);
1052 assert(!is_initialized(), "sanity");
1053 assert(!is_being_initialized(), "sanity");
1054 assert(!is_in_error_state(), "sanity");
1055 }
1056 #endif
1057
1058 set_init_thread(THREAD);
1059 set_initialization_state_and_notify(fully_initialized, CHECK);
1060 }
1061 #endif
1062
1063 bool InstanceKlass::verify_code(TRAPS) {
1064 // 1) Verify the bytecodes
1065 return Verifier::verify(this, should_verify_class(), THREAD);
1066 }
1067
1068 static void load_classes_from_loadable_descriptors_attribute(InstanceKlass *ik, TRAPS) {
1069 if (ik->loadable_descriptors() != Universe::the_empty_short_array() && PreloadClasses) {
1070 ResourceMark rm(THREAD);
1071 HandleMark hm(THREAD);
1072 for (int i = 0; i < ik->loadable_descriptors()->length(); i++) {
1073 Symbol* sig = ik->constants()->symbol_at(ik->loadable_descriptors()->at(i));
1074 if (!Signature::has_envelope(sig)) continue;
1075 TempNewSymbol class_name = Signature::strip_envelope(sig);
1076 if (class_name == ik->name()) continue;
1077 log_info(class, preload)("Preloading of class %s during linking of class %s "
1078 "because the class is listed in the LoadableDescriptors attribute",
1079 sig->as_C_string(), ik->name()->as_C_string());
1080 oop loader = ik->class_loader();
1081 Klass* klass = nullptr;
1082
1083 if (CDSConfig::is_using_aot_linked_classes() && ik->in_aot_cache() && !ik->defined_by_other_loaders()) {
1084 // + We come to here during AOTLinkedClassBulkLoader::link_classes() and it's too early to
1085 // execute any Java code.
1086 // + All loadable descriptors that can be resolved would have been resolved during the AOT assembly
1087 // phase, and would have been loaded earlier by AOTLinkedClassBulkLoader, so they can be found in
1088 // the system dictionary.
1089 // + If no class of the given name have been loaded yet, it's most likely because the class
1090 // is missing from JAR files. Just ignore it.
1091 klass = SystemDictionary::find_instance_or_array_klass(THREAD, class_name, Handle(THREAD, loader));
1092 } else {
1093 klass = SystemDictionary::resolve_or_null(class_name,
1094 Handle(THREAD, loader), THREAD);
1095 }
1096 if (HAS_PENDING_EXCEPTION) {
1097 CLEAR_PENDING_EXCEPTION;
1098 }
1099 if (klass != nullptr) {
1100 log_info(class, preload)("Preloading of class %s during linking of class %s "
1101 "(cause: LoadableDescriptors attribute) succeeded",
1102 class_name->as_C_string(), ik->name()->as_C_string());
1103 if (!klass->is_inline_klass()) {
1104 // Non value classes are allowed by the current spec, but it could be an indication
1105 // of an issue so let's log a warning
1106 log_info(class, preload)("Preloading of class %s during linking of class %s "
1107 "(cause: LoadableDescriptors attribute) but loaded class is not a value class",
1108 class_name->as_C_string(), ik->name()->as_C_string());
1109 }
1110 } else {
1111 log_info(class, preload)("Preloading of class %s during linking of class %s "
1112 "(cause: LoadableDescriptors attribute) failed",
1113 class_name->as_C_string(), ik->name()->as_C_string());
1114 }
1115 }
1116 }
1117 }
1118
1119 void InstanceKlass::link_class(TRAPS) {
1120 assert(is_loaded(), "must be loaded");
1121 if (!is_linked()) {
1122 link_class_impl(CHECK);
1123 }
1124 }
1125
1126 // Called to verify that a class can link during initialization, without
1127 // throwing a VerifyError.
1128 bool InstanceKlass::link_class_or_fail(TRAPS) {
1129 assert(is_loaded(), "must be loaded");
1130 if (!is_linked()) {
1131 link_class_impl(CHECK_false);
1132 }
1133 return is_linked();
1134 }
1135
1136 bool InstanceKlass::link_class_impl(TRAPS) {
1137 if (CDSConfig::is_dumping_static_archive() && SystemDictionaryShared::has_class_failed_verification(this)) {
1138 // This is for CDS static dump only -- we use the in_error_state to indicate that
1139 // the class has failed verification. Throwing the NoClassDefFoundError here is just
1140 // a convenient way to stop repeat attempts to verify the same (bad) class.
1141 //
1142 // Note that the NoClassDefFoundError is not part of the JLS, and should not be thrown
1143 // if we are executing Java code. This is not a problem for CDS dumping phase since
1144 // it doesn't execute any Java code.
1145 ResourceMark rm(THREAD);
1146 // Names are all known to be < 64k so we know this formatted message is not excessively large.
1147 Exceptions::fthrow(THREAD_AND_LOCATION,
1148 vmSymbols::java_lang_NoClassDefFoundError(),
1149 "Class %s, or one of its supertypes, failed class initialization",
1150 external_name());
1151 return false;
1152 }
1153 // return if already verified
1154 if (is_linked()) {
1155 return true;
1156 }
1157
1158 // Timing
1159 // timer handles recursion
1160 JavaThread* jt = THREAD;
1161
1162 // link super class before linking this class
1163 InstanceKlass* super_klass = super();
1164 if (super_klass != nullptr) {
1165 if (super_klass->is_interface()) { // check if super class is an interface
1166 ResourceMark rm(THREAD);
1167 // Names are all known to be < 64k so we know this formatted message is not excessively large.
1168 Exceptions::fthrow(
1169 THREAD_AND_LOCATION,
1170 vmSymbols::java_lang_IncompatibleClassChangeError(),
1171 "class %s has interface %s as super class",
1172 external_name(),
1173 super_klass->external_name()
1174 );
1175 return false;
1176 }
1177
1178 super_klass->link_class_impl(CHECK_false);
1179 }
1180
1181 // link all interfaces implemented by this class before linking this class
1182 Array<InstanceKlass*>* interfaces = local_interfaces();
1183 int num_interfaces = interfaces->length();
1184 for (int index = 0; index < num_interfaces; index++) {
1185 InstanceKlass* interk = interfaces->at(index);
1186 interk->link_class_impl(CHECK_false);
1187 }
1188
1189 if (Arguments::is_valhalla_enabled()) {
1190 // Aggressively preloading all classes from the LoadableDescriptors attribute
1191 // so inline classes can be scalarized in the calling conventions computed below
1192 load_classes_from_loadable_descriptors_attribute(this, THREAD);
1193 assert(!HAS_PENDING_EXCEPTION, "Shouldn't have pending exceptions from call above");
1194 }
1195
1196 // in case the class is linked in the process of linking its superclasses
1197 if (is_linked()) {
1198 return true;
1199 }
1200
1201 // trace only the link time for this klass that includes
1202 // the verification time
1203 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
1204 ClassLoader::perf_class_link_selftime(),
1205 ClassLoader::perf_classes_linked(),
1206 jt->get_thread_stat()->perf_recursion_counts_addr(),
1207 jt->get_thread_stat()->perf_timers_addr(),
1208 PerfClassTraceTime::CLASS_LINK);
1209
1210 // verification & rewriting
1211 {
1212 HandleMark hm(THREAD);
1213 Handle h_init_lock(THREAD, init_lock());
1214 ObjectLocker ol(h_init_lock, CHECK_PREEMPTABLE_false);
1215 // Don't allow preemption if we link/initialize classes below,
1216 // since that would release this monitor while we are in the
1217 // middle of linking this class.
1218 NoPreemptMark npm(THREAD);
1219
1220 // rewritten will have been set if loader constraint error found
1221 // on an earlier link attempt
1222 // don't verify or rewrite if already rewritten
1223 //
1224
1225 if (!is_linked()) {
1226 if (!is_rewritten()) {
1227 if (in_aot_cache()) {
1228 assert(!verified_at_dump_time(), "must be");
1229 }
1230 {
1231 bool verify_ok = verify_code(THREAD);
1232 if (!verify_ok) {
1233 return false;
1234 }
1235 }
1236
1237 // Just in case a side-effect of verify linked this class already
1238 // (which can sometimes happen since the verifier loads classes
1239 // using custom class loaders, which are free to initialize things)
1240 if (is_linked()) {
1241 return true;
1242 }
1243
1244 // also sets rewritten
1245 rewrite_class(CHECK_false);
1246 } else if (in_aot_cache()) {
1247 SystemDictionaryShared::check_verification_constraints(this, CHECK_false);
1248 }
1249
1250 // relocate jsrs and link methods after they are all rewritten
1251 link_methods(CHECK_false);
1252
1253 // Initialize the vtable and interface table after
1254 // methods have been rewritten since rewrite may
1255 // fabricate new Method*s.
1256 // also does loader constraint checking
1257 //
1258 // initialize_vtable and initialize_itable need to be rerun
1259 // for a shared class if
1260 // 1) the class is loaded by custom class loader or
1261 // 2) the class is loaded by built-in class loader but failed to add archived loader constraints or
1262 // 3) the class was not verified during dump time
1263 bool need_init_table = true;
1264 if (in_aot_cache() && verified_at_dump_time() &&
1265 SystemDictionaryShared::check_linking_constraints(THREAD, this)) {
1266 need_init_table = false;
1267 }
1268 if (need_init_table) {
1269 vtable().initialize_vtable_and_check_constraints(CHECK_false);
1270 itable().initialize_itable_and_check_constraints(CHECK_false);
1271 }
1272 #ifdef ASSERT
1273 vtable().verify(tty, true);
1274 // In case itable verification is ever added.
1275 // itable().verify(tty, true);
1276 #endif
1277 if (Universe::is_fully_initialized()) {
1278 DeoptimizationScope deopt_scope;
1279 {
1280 // Now mark all code that assumes the class is not linked.
1281 // Set state under the Compile_lock also.
1282 MutexLocker ml(THREAD, Compile_lock);
1283
1284 set_init_state(linked);
1285 CodeCache::mark_dependents_on(&deopt_scope, this);
1286 }
1287 // Perform the deopt handshake outside Compile_lock.
1288 deopt_scope.deoptimize_marked();
1289 } else {
1290 set_init_state(linked);
1291 }
1292 if (JvmtiExport::should_post_class_prepare()) {
1293 JvmtiExport::post_class_prepare(THREAD, this);
1294 }
1295 }
1296 }
1297
1298 if (log_is_enabled(Info, class, link)) {
1299 ResourceMark rm(THREAD);
1300 log_info(class, link)("Linked class %s", external_name());
1301 }
1302
1303 return true;
1304 }
1305
1306 // Rewrite the byte codes of all of the methods of a class.
1307 // The rewriter must be called exactly once. Rewriting must happen after
1308 // verification but before the first method of the class is executed.
1309 void InstanceKlass::rewrite_class(TRAPS) {
1310 assert(is_loaded(), "must be loaded");
1311 if (is_rewritten()) {
1312 assert(in_aot_cache(), "rewriting an unshared class?");
1313 return;
1314 }
1315 Rewriter::rewrite(this, CHECK);
1316 set_rewritten();
1317 }
1318
1319 // Now relocate and link method entry points after class is rewritten.
1320 // This is outside is_rewritten flag. In case of an exception, it can be
1321 // executed more than once.
1322 void InstanceKlass::link_methods(TRAPS) {
1323 PerfTraceTime timer(ClassLoader::perf_ik_link_methods_time());
1324
1325 int len = methods()->length();
1326 for (int i = len-1; i >= 0; i--) {
1327 methodHandle m(THREAD, methods()->at(i));
1328
1329 // Set up method entry points for compiler and interpreter .
1330 m->link_method(m, CHECK);
1331 }
1332 }
1333
1334 // Eagerly initialize superinterfaces that declare default methods (concrete instance: any access)
1335 void InstanceKlass::initialize_super_interfaces(TRAPS) {
1336 assert (has_nonstatic_concrete_methods(), "caller should have checked this");
1337 for (int i = 0; i < local_interfaces()->length(); ++i) {
1338 InstanceKlass* ik = local_interfaces()->at(i);
1339
1340 // Initialization is depth first search ie. we start with top of the inheritance tree
1341 // has_nonstatic_concrete_methods drives searching superinterfaces since it
1342 // means has_nonstatic_concrete_methods in its superinterface hierarchy
1343 if (ik->has_nonstatic_concrete_methods()) {
1344 ik->initialize_super_interfaces(CHECK);
1345 }
1346
1347 // Only initialize() interfaces that "declare" concrete methods.
1348 if (ik->should_be_initialized() && ik->declares_nonstatic_concrete_methods()) {
1349 ik->initialize(CHECK);
1350 }
1351 }
1352 }
1353
1354 using InitializationErrorTable = HashTable<const InstanceKlass*, OopHandle, 107, AnyObj::C_HEAP, mtClass>;
1355 static InitializationErrorTable* _initialization_error_table;
1356
1357 void InstanceKlass::add_initialization_error(JavaThread* current, Handle exception) {
1358 // Create the same exception with a message indicating the thread name,
1359 // and the StackTraceElements.
1360 Handle init_error = java_lang_Throwable::create_initialization_error(current, exception);
1361 ResourceMark rm(current);
1362 if (init_error.is_null()) {
1363 log_trace(class, init)("Unable to create the desired initialization error for class %s", external_name());
1364
1365 // We failed to create the new exception, most likely due to either out-of-memory or
1366 // a stackoverflow error. If the original exception was either of those then we save
1367 // the shared, pre-allocated, stackless, instance of that exception.
1368 if (exception->klass() == vmClasses::StackOverflowError_klass()) {
1369 log_debug(class, init)("Using shared StackOverflowError as initialization error for class %s", external_name());
1370 init_error = Handle(current, Universe::class_init_stack_overflow_error());
1371 } else if (exception->klass() == vmClasses::OutOfMemoryError_klass()) {
1372 log_debug(class, init)("Using shared OutOfMemoryError as initialization error for class %s", external_name());
1373 init_error = Handle(current, Universe::class_init_out_of_memory_error());
1374 } else {
1375 return;
1376 }
1377 }
1378
1379 MutexLocker ml(current, ClassInitError_lock);
1380 OopHandle elem = OopHandle(Universe::vm_global(), init_error());
1381 bool created;
1382 if (_initialization_error_table == nullptr) {
1383 _initialization_error_table = new (mtClass) InitializationErrorTable();
1384 }
1385 _initialization_error_table->put_if_absent(this, elem, &created);
1386 assert(created, "Initialization is single threaded");
1387 log_trace(class, init)("Initialization error added for class %s", external_name());
1388 }
1389
1390 oop InstanceKlass::get_initialization_error(JavaThread* current) {
1391 MutexLocker ml(current, ClassInitError_lock);
1392 if (_initialization_error_table == nullptr) {
1393 return nullptr;
1394 }
1395 OopHandle* h = _initialization_error_table->get(this);
1396 return (h != nullptr) ? h->resolve() : nullptr;
1397 }
1398
1399 // Need to remove entries for unloaded classes.
1400 void InstanceKlass::clean_initialization_error_table() {
1401 struct InitErrorTableCleaner {
1402 bool do_entry(const InstanceKlass* ik, OopHandle h) {
1403 if (!ik->is_loader_alive()) {
1404 h.release(Universe::vm_global());
1405 return true;
1406 } else {
1407 return false;
1408 }
1409 }
1410 };
1411
1412 assert_locked_or_safepoint(ClassInitError_lock);
1413 InitErrorTableCleaner cleaner;
1414 if (_initialization_error_table != nullptr) {
1415 _initialization_error_table->unlink(&cleaner);
1416 }
1417 }
1418
1419 class ThreadWaitingForClassInit : public StackObj {
1420 JavaThread* _thread;
1421 public:
1422 ThreadWaitingForClassInit(JavaThread* thread, InstanceKlass* ik) : _thread(thread) {
1423 _thread->set_class_to_be_initialized(ik);
1424 }
1425 ~ThreadWaitingForClassInit() {
1426 _thread->set_class_to_be_initialized(nullptr);
1427 }
1428 };
1429
1430 void InstanceKlass::initialize_impl(TRAPS) {
1431 HandleMark hm(THREAD);
1432
1433 // Make sure klass is linked (verified) before initialization
1434 // A class could already be verified, since it has been reflected upon.
1435 link_class(CHECK);
1436
1437 DTRACE_CLASSINIT_PROBE(required, -1);
1438
1439 bool wait = false;
1440
1441 JavaThread* jt = THREAD;
1442
1443 bool debug_logging_enabled = log_is_enabled(Debug, class, init);
1444
1445 // refer to the JVM book page 47 for description of steps
1446 // Step 1
1447 {
1448 Handle h_init_lock(THREAD, init_lock());
1449 ObjectLocker ol(h_init_lock, CHECK_PREEMPTABLE);
1450
1451 // Step 2
1452 // If we were to use wait() instead of waitInterruptibly() then
1453 // we might end up throwing IE from link/symbol resolution sites
1454 // that aren't expected to throw. This would wreak havoc. See 6320309.
1455 while (is_being_initialized() && !is_reentrant_initialization(jt)) {
1456 if (debug_logging_enabled) {
1457 ResourceMark rm(jt);
1458 log_debug(class, init)("Thread \"%s\" waiting for initialization of %s by thread \"%s\"",
1459 jt->name(), external_name(), init_thread_name());
1460 }
1461 wait = true;
1462 ThreadWaitingForClassInit twcl(THREAD, this);
1463 ol.wait_uninterruptibly(CHECK_PREEMPTABLE);
1464 }
1465
1466 // Step 3
1467 if (is_being_initialized() && is_reentrant_initialization(jt)) {
1468 if (debug_logging_enabled) {
1469 ResourceMark rm(jt);
1470 log_debug(class, init)("Thread \"%s\" recursively initializing %s",
1471 jt->name(), external_name());
1472 }
1473 DTRACE_CLASSINIT_PROBE_WAIT(recursive, -1, wait);
1474 return;
1475 }
1476
1477 // Step 4
1478 if (is_initialized()) {
1479 if (debug_logging_enabled) {
1480 ResourceMark rm(jt);
1481 log_debug(class, init)("Thread \"%s\" found %s already initialized",
1482 jt->name(), external_name());
1483 }
1484 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, -1, wait);
1485 return;
1486 }
1487
1488 // Step 5
1489 if (is_in_error_state()) {
1490 if (debug_logging_enabled) {
1491 ResourceMark rm(jt);
1492 log_debug(class, init)("Thread \"%s\" found %s is in error state",
1493 jt->name(), external_name());
1494 }
1495
1496 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait);
1497 ResourceMark rm(THREAD);
1498 Handle cause(THREAD, get_initialization_error(THREAD));
1499
1500 stringStream ss;
1501 ss.print("Could not initialize class %s", external_name());
1502 if (cause.is_null()) {
1503 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), ss.as_string());
1504 } else {
1505 THROW_MSG_CAUSE(vmSymbols::java_lang_NoClassDefFoundError(),
1506 ss.as_string(), cause);
1507 }
1508 } else {
1509
1510 // Step 6
1511 set_init_state(being_initialized);
1512 set_init_thread(jt);
1513 if (debug_logging_enabled) {
1514 ResourceMark rm(jt);
1515 log_debug(class, init)("Thread \"%s\" is initializing %s",
1516 jt->name(), external_name());
1517 }
1518 }
1519 }
1520
1521 // Block preemption once we are the initializer thread. Unmounting now
1522 // would complicate the reentrant case (identity is platform thread).
1523 NoPreemptMark npm(THREAD);
1524
1525 // Pre-allocating an all-zero value to be used to reset nullable flat storages
1526 if (is_inline_klass()) {
1527 InlineKlass* vk = InlineKlass::cast(this);
1528 if (vk->supports_nullable_layouts()) {
1529 oop val = vk->allocate_instance(THREAD);
1530 if (HAS_PENDING_EXCEPTION) {
1531 Handle e(THREAD, PENDING_EXCEPTION);
1532 CLEAR_PENDING_EXCEPTION;
1533 {
1534 EXCEPTION_MARK;
1535 add_initialization_error(THREAD, e);
1536 // Locks object, set state, and notify all waiting threads
1537 set_initialization_state_and_notify(initialization_error, THREAD);
1538 CLEAR_PENDING_EXCEPTION;
1539 }
1540 THROW_OOP(e());
1541 }
1542 vk->set_null_reset_value(val);
1543 }
1544 }
1545
1546 // Step 7
1547 // Next, if C is a class rather than an interface, initialize it's super class and super
1548 // interfaces.
1549 if (!is_interface()) {
1550 Klass* super_klass = super();
1551 if (super_klass != nullptr && super_klass->should_be_initialized()) {
1552 super_klass->initialize(THREAD);
1553 }
1554 // If C implements any interface that declares a non-static, concrete method,
1555 // the initialization of C triggers initialization of its super interfaces.
1556 // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and
1557 // having a superinterface that declares, non-static, concrete methods
1558 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) {
1559 initialize_super_interfaces(THREAD);
1560 }
1561
1562 // If any exceptions, complete abruptly, throwing the same exception as above.
1563 if (HAS_PENDING_EXCEPTION) {
1564 Handle e(THREAD, PENDING_EXCEPTION);
1565 CLEAR_PENDING_EXCEPTION;
1566 {
1567 EXCEPTION_MARK;
1568 add_initialization_error(THREAD, e);
1569 // Locks object, set state, and notify all waiting threads
1570 set_initialization_state_and_notify(initialization_error, THREAD);
1571 CLEAR_PENDING_EXCEPTION;
1572 }
1573 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait);
1574 THROW_OOP(e());
1575 }
1576 }
1577
1578
1579 // Step 8
1580 {
1581 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
1582 if (class_initializer() != nullptr) {
1583 // Timer includes any side effects of class initialization (resolution,
1584 // etc), but not recursive entry into call_class_initializer().
1585 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
1586 ClassLoader::perf_class_init_selftime(),
1587 ClassLoader::perf_classes_inited(),
1588 jt->get_thread_stat()->perf_recursion_counts_addr(),
1589 jt->get_thread_stat()->perf_timers_addr(),
1590 PerfClassTraceTime::CLASS_CLINIT);
1591 call_class_initializer(THREAD);
1592 } else {
1593 // The elapsed time is so small it's not worth counting.
1594 if (UsePerfData) {
1595 ClassLoader::perf_classes_inited()->inc();
1596 }
1597 call_class_initializer(THREAD);
1598 }
1599
1600 if (has_strict_static_fields() && !HAS_PENDING_EXCEPTION && !ReplayCompiles) {
1601 // Step 9 also verifies that strict static fields have been initialized.
1602 // Status bits were set in ClassFileParser::post_process_parsed_stream.
1603 // After <clinit>, bits must all be clear, or else we must throw an error.
1604 // This is an extremely fast check, so we won't bother with a timer.
1605 assert(fields_status() != nullptr, "");
1606 Symbol* bad_strict_static = nullptr;
1607 for (int index = 0; index < fields_status()->length(); index++) {
1608 // Very fast loop over single byte array looking for a set bit.
1609 if (fields_status()->adr_at(index)->is_strict_static_unset()) {
1610 // This strict static field has not been set by the class initializer.
1611 // Note that in the common no-error case, we read no field metadata.
1612 // We only unpack it when we need to report an error.
1613 FieldInfo fi = field(index);
1614 bad_strict_static = fi.name(constants());
1615 if (debug_logging_enabled) {
1616 ResourceMark rm(jt);
1617 const char* msg = format_strict_static_message(bad_strict_static);
1618 log_debug(class, init)("%s", msg);
1619 } else {
1620 // If we are not logging, do not bother to look for a second offense.
1621 break;
1622 }
1623 }
1624 }
1625 if (bad_strict_static != nullptr) {
1626 throw_strict_static_exception(bad_strict_static, "is unset after initialization of", THREAD);
1627 }
1628 }
1629 }
1630
1631 // Step 9
1632 if (!HAS_PENDING_EXCEPTION) {
1633 set_initialization_state_and_notify(fully_initialized, CHECK);
1634 DEBUG_ONLY(vtable().verify(tty, true);)
1635 CompilationPolicy::replay_training_at_init(this, THREAD);
1636 }
1637 else {
1638 // Step 10 and 11
1639 Handle e(THREAD, PENDING_EXCEPTION);
1640 CLEAR_PENDING_EXCEPTION;
1641 // JVMTI has already reported the pending exception
1642 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1643 JvmtiExport::clear_detected_exception(jt);
1644 {
1645 EXCEPTION_MARK;
1646 add_initialization_error(THREAD, e);
1647 set_initialization_state_and_notify(initialization_error, THREAD);
1648 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below
1649 // JVMTI has already reported the pending exception
1650 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1651 JvmtiExport::clear_detected_exception(jt);
1652 }
1653 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
1654 if (e->is_a(vmClasses::Error_klass())) {
1655 THROW_OOP(e());
1656 } else {
1657 JavaCallArguments args(e);
1658 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
1659 vmSymbols::throwable_void_signature(),
1660 &args);
1661 }
1662 }
1663 DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait);
1664 }
1665
1666
1667 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) {
1668 Handle h_init_lock(THREAD, init_lock());
1669 if (h_init_lock() != nullptr) {
1670 ObjectLocker ol(h_init_lock, THREAD);
1671 set_init_thread(nullptr); // reset _init_thread before changing _init_state
1672 set_init_state(state);
1673 fence_and_clear_init_lock();
1674 ol.notify_all(CHECK);
1675 } else {
1676 assert(h_init_lock() != nullptr, "The initialization state should never be set twice");
1677 set_init_thread(nullptr); // reset _init_thread before changing _init_state
1678 set_init_state(state);
1679 }
1680 }
1681
1682 void InstanceKlass::notify_strict_static_access(int field_index, bool is_writing, TRAPS) {
1683 guarantee(field_index >= 0 && field_index < fields_status()->length(), "valid field index");
1684 DEBUG_ONLY(FieldInfo debugfi = field(field_index));
1685 assert(debugfi.access_flags().is_strict(), "");
1686 assert(debugfi.access_flags().is_static(), "");
1687 FieldStatus& fs = *fields_status()->adr_at(field_index);
1688 LogTarget(Trace, class, init) lt;
1689 if (lt.is_enabled()) {
1690 ResourceMark rm(THREAD);
1691 LogStream ls(lt);
1692 FieldInfo fi = field(field_index);
1693 ls.print("notify %s %s %s%s ",
1694 external_name(), is_writing? "Write" : "Read",
1695 fs.is_strict_static_unset() ? "Unset" : "(set)",
1696 fs.is_strict_static_unread() ? "+Unread" : "");
1697 fi.print(&ls, constants());
1698 }
1699 if (fs.is_strict_static_unset()) {
1700 assert(fs.is_strict_static_unread(), "ClassFileParser resp.");
1701 // If it is not set, there are only two reasonable things we can do here:
1702 // - mark it set if this is putstatic
1703 // - throw an error (Read-Before-Write) if this is getstatic
1704
1705 // The unset state is (or should be) transient, and observable only in one
1706 // thread during the execution of <clinit>. Something is wrong here as this
1707 // should not be possible
1708 guarantee(is_reentrant_initialization(THREAD), "unscoped access to strict static");
1709 if (is_writing) {
1710 // clear the "unset" bit, since the field is actually going to be written
1711 fs.update_strict_static_unset(false);
1712 } else {
1713 // throw an IllegalStateException, since we are reading before writing
1714 // see also InstanceKlass::initialize_impl, Step 8 (at end)
1715 Symbol* bad_strict_static = field(field_index).name(constants());
1716 throw_strict_static_exception(bad_strict_static, "is unset before first read in", CHECK);
1717 }
1718 } else {
1719 // Ensure no write after read for final strict statics
1720 FieldInfo fi = field(field_index);
1721 bool is_final = fi.access_flags().is_final();
1722 if (is_final) {
1723 // no final write after read, so observing a constant freezes it, as if <clinit> ended early
1724 // (maybe we could trust the constant a little earlier, before <clinit> ends)
1725 if (is_writing && !fs.is_strict_static_unread()) {
1726 Symbol* bad_strict_static = fi.name(constants());
1727 throw_strict_static_exception(bad_strict_static, "is set after read (as final) in", CHECK);
1728 } else if (!is_writing && fs.is_strict_static_unread()) {
1729 fs.update_strict_static_unread(false);
1730 }
1731 }
1732 }
1733 }
1734
1735 void InstanceKlass::throw_strict_static_exception(Symbol* field_name, const char* when, TRAPS) {
1736 ResourceMark rm(THREAD);
1737 const char* msg = format_strict_static_message(field_name, when);
1738 THROW_MSG(vmSymbols::java_lang_IllegalStateException(), msg);
1739 }
1740
1741 const char* InstanceKlass::format_strict_static_message(Symbol* field_name, const char* when) {
1742 stringStream ss;
1743 ss.print("Strict static \"%s\" %s %s",
1744 field_name->as_C_string(),
1745 when == nullptr ? "is unset in" : when,
1746 external_name());
1747 return ss.as_string();
1748 }
1749
1750 bool InstanceKlass::has_strict_instance_fields_in_hierarchy() const {
1751 for (const InstanceKlass* ik = this; ik != nullptr; ik = ik->java_super()) {
1752 if (ik->has_strict_instance_fields()) {
1753 return true;
1754 }
1755 }
1756 return false;
1757 }
1758
1759 // Update hierarchy. This is done before the new klass has been added to the SystemDictionary. The Compile_lock
1760 // is grabbed, to ensure that the compiler is not using the class hierarchy.
1761 void InstanceKlass::add_to_hierarchy(JavaThread* current) {
1762 assert(!SafepointSynchronize::is_at_safepoint(), "must NOT be at safepoint");
1763
1764 DeoptimizationScope deopt_scope;
1765 {
1766 MutexLocker ml(current, Compile_lock);
1767
1768 set_init_state(InstanceKlass::loaded);
1769 // make sure init_state store is already done.
1770 // The compiler reads the hierarchy outside of the Compile_lock.
1771 // Access ordering is used to add to hierarchy.
1772
1773 // Link into hierarchy.
1774 append_to_sibling_list(); // add to superklass/sibling list
1775 process_interfaces(); // handle all "implements" declarations
1776
1777 // Now mark all code that depended on old class hierarchy.
1778 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97)
1779 if (Universe::is_fully_initialized()) {
1780 CodeCache::mark_dependents_on(&deopt_scope, this);
1781 }
1782 }
1783 // Perform the deopt handshake outside Compile_lock.
1784 deopt_scope.deoptimize_marked();
1785 }
1786
1787
1788 InstanceKlass* InstanceKlass::implementor() const {
1789 InstanceKlass* volatile* ik = adr_implementor();
1790 if (ik == nullptr) {
1791 return nullptr;
1792 } else {
1793 // This load races with inserts, and therefore needs acquire.
1794 InstanceKlass* ikls = AtomicAccess::load_acquire(ik);
1795 if (ikls != nullptr && !ikls->is_loader_alive()) {
1796 return nullptr; // don't return unloaded class
1797 } else {
1798 return ikls;
1799 }
1800 }
1801 }
1802
1803
1804 void InstanceKlass::set_implementor(InstanceKlass* ik) {
1805 assert_locked_or_safepoint(Compile_lock);
1806 assert(is_interface(), "not interface");
1807 InstanceKlass* volatile* addr = adr_implementor();
1808 assert(addr != nullptr, "null addr");
1809 if (addr != nullptr) {
1810 AtomicAccess::release_store(addr, ik);
1811 }
1812 }
1813
1814 int InstanceKlass::nof_implementors() const {
1815 InstanceKlass* ik = implementor();
1816 if (ik == nullptr) {
1817 return 0;
1818 } else if (ik != this) {
1819 return 1;
1820 } else {
1821 return 2;
1822 }
1823 }
1824
1825 // The embedded _implementor field can only record one implementor.
1826 // When there are more than one implementors, the _implementor field
1827 // is set to the interface Klass* itself. Following are the possible
1828 // values for the _implementor field:
1829 // null - no implementor
1830 // implementor Klass* - one implementor
1831 // self - more than one implementor
1832 //
1833 // The _implementor field only exists for interfaces.
1834 void InstanceKlass::add_implementor(InstanceKlass* ik) {
1835 if (Universe::is_fully_initialized()) {
1836 assert_lock_strong(Compile_lock);
1837 }
1838 assert(is_interface(), "not interface");
1839 // Filter out my subinterfaces.
1840 // (Note: Interfaces are never on the subklass list.)
1841 if (ik->is_interface()) return;
1842
1843 // Filter out subclasses whose supers already implement me.
1844 // (Note: CHA must walk subclasses of direct implementors
1845 // in order to locate indirect implementors.)
1846 InstanceKlass* super_ik = ik->super();
1847 if (super_ik != nullptr && super_ik->implements_interface(this))
1848 // We only need to check one immediate superclass, since the
1849 // implements_interface query looks at transitive_interfaces.
1850 // Any supers of the super have the same (or fewer) transitive_interfaces.
1851 return;
1852
1853 InstanceKlass* iklass = implementor();
1854 if (iklass == nullptr) {
1855 set_implementor(ik);
1856 } else if (iklass != this && iklass != ik) {
1857 // There is already an implementor. Use itself as an indicator of
1858 // more than one implementors.
1859 set_implementor(this);
1860 }
1861
1862 // The implementor also implements the transitive_interfaces
1863 for (int index = 0; index < local_interfaces()->length(); index++) {
1864 local_interfaces()->at(index)->add_implementor(ik);
1865 }
1866 }
1867
1868 void InstanceKlass::init_implementor() {
1869 if (is_interface()) {
1870 set_implementor(nullptr);
1871 }
1872 }
1873
1874
1875 void InstanceKlass::process_interfaces() {
1876 // link this class into the implementors list of every interface it implements
1877 for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
1878 assert(local_interfaces()->at(i)->is_klass(), "must be a klass");
1879 InstanceKlass* interf = local_interfaces()->at(i);
1880 assert(interf->is_interface(), "expected interface");
1881 interf->add_implementor(this);
1882 }
1883 }
1884
1885 bool InstanceKlass::can_be_primary_super_slow() const {
1886 if (is_interface())
1887 return false;
1888 else
1889 return Klass::can_be_primary_super_slow();
1890 }
1891
1892 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots,
1893 Array<InstanceKlass*>* transitive_interfaces) {
1894 // The secondaries are the implemented interfaces.
1895 // We need the cast because Array<Klass*> is NOT a supertype of Array<InstanceKlass*>,
1896 // (but it's safe to do here because we won't write into _secondary_supers from this point on).
1897 Array<Klass*>* interfaces = (Array<Klass*>*)(address)transitive_interfaces;
1898 int num_secondaries = num_extra_slots + interfaces->length();
1899 if (num_secondaries == 0) {
1900 // Must share this for correct bootstrapping!
1901 set_secondary_supers(Universe::the_empty_klass_array(), Universe::the_empty_klass_bitmap());
1902 return nullptr;
1903 } else if (num_extra_slots == 0 && interfaces->length() <= 1) {
1904 // We will reuse the transitive interfaces list if we're certain
1905 // it's in hash order.
1906 uintx bitmap = compute_secondary_supers_bitmap(interfaces);
1907 set_secondary_supers(interfaces, bitmap);
1908 return nullptr;
1909 }
1910 // Copy transitive interfaces to a temporary growable array to be constructed
1911 // into the secondary super list with extra slots.
1912 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length());
1913 for (int i = 0; i < interfaces->length(); i++) {
1914 secondaries->push(interfaces->at(i));
1915 }
1916 return secondaries;
1917 }
1918
1919 bool InstanceKlass::implements_interface(Klass* k) const {
1920 if (this == k) return true;
1921 assert(k->is_interface(), "should be an interface class");
1922 for (int i = 0; i < transitive_interfaces()->length(); i++) {
1923 if (transitive_interfaces()->at(i) == k) {
1924 return true;
1925 }
1926 }
1927 return false;
1928 }
1929
1930 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const {
1931 // Verify direct super interface
1932 if (this == k) return true;
1933 assert(k->is_interface(), "should be an interface class");
1934 for (int i = 0; i < local_interfaces()->length(); i++) {
1935 if (local_interfaces()->at(i) == k) {
1936 return true;
1937 }
1938 }
1939 return false;
1940 }
1941
1942 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
1943 if (TraceFinalizerRegistration) {
1944 tty->print("Registered ");
1945 i->print_value_on(tty);
1946 tty->print_cr(" (" PTR_FORMAT ") as finalizable", p2i(i));
1947 }
1948 instanceHandle h_i(THREAD, i);
1949 // Pass the handle as argument, JavaCalls::call expects oop as jobjects
1950 JavaValue result(T_VOID);
1951 JavaCallArguments args(h_i);
1952 methodHandle mh(THREAD, Universe::finalizer_register_method());
1953 JavaCalls::call(&result, mh, &args, CHECK_NULL);
1954 MANAGEMENT_ONLY(FinalizerService::on_register(h_i(), THREAD);)
1955 return h_i();
1956 }
1957
1958 instanceOop InstanceKlass::allocate_instance(TRAPS) {
1959 assert(!is_abstract() && !is_interface(), "Should not create this object");
1960 size_t size = size_helper(); // Query before forming handle.
1961 return (instanceOop)Universe::heap()->obj_allocate(this, size, THREAD);
1962 }
1963
1964 instanceOop InstanceKlass::allocate_instance(oop java_class, TRAPS) {
1965 Klass* k = java_lang_Class::as_Klass(java_class);
1966 if (k == nullptr) {
1967 ResourceMark rm(THREAD);
1968 THROW_(vmSymbols::java_lang_InstantiationException(), nullptr);
1969 }
1970 InstanceKlass* ik = cast(k);
1971 ik->check_valid_for_instantiation(false, CHECK_NULL);
1972 ik->initialize(CHECK_NULL);
1973 return ik->allocate_instance(THREAD);
1974 }
1975
1976 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) {
1977 return instanceHandle(THREAD, allocate_instance(THREAD));
1978 }
1979
1980 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1981 if (is_interface() || is_abstract()) {
1982 ResourceMark rm(THREAD);
1983 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1984 : vmSymbols::java_lang_InstantiationException(), external_name());
1985 }
1986 if (this == vmClasses::Class_klass()) {
1987 ResourceMark rm(THREAD);
1988 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1989 : vmSymbols::java_lang_IllegalAccessException(), external_name());
1990 }
1991 }
1992
1993 ArrayKlass* InstanceKlass::array_klass(int n, TRAPS) {
1994 // Need load-acquire for lock-free read
1995 if (array_klasses_acquire() == nullptr) {
1996
1997 // Recursively lock array allocation
1998 RecursiveLocker rl(MultiArray_lock, THREAD);
1999
2000 // Check if another thread created the array klass while we were waiting for the lock.
2001 if (array_klasses() == nullptr) {
2002 ObjArrayKlass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this, CHECK_NULL);
2003 // use 'release' to pair with lock-free load
2004 release_set_array_klasses(k);
2005 }
2006 }
2007
2008 // array_klasses() will always be set at this point
2009 ObjArrayKlass* ak = array_klasses();
2010 assert(ak != nullptr, "should be set");
2011 return ak->array_klass(n, THREAD);
2012 }
2013
2014 ArrayKlass* InstanceKlass::array_klass_or_null(int n) {
2015 // Need load-acquire for lock-free read
2016 ObjArrayKlass* oak = array_klasses_acquire();
2017 if (oak == nullptr) {
2018 return nullptr;
2019 } else {
2020 return oak->array_klass_or_null(n);
2021 }
2022 }
2023
2024 ArrayKlass* InstanceKlass::array_klass(TRAPS) {
2025 return array_klass(1, THREAD);
2026 }
2027
2028 ArrayKlass* InstanceKlass::array_klass_or_null() {
2029 return array_klass_or_null(1);
2030 }
2031
2032 Method* InstanceKlass::class_initializer() const {
2033 Method* clinit = find_method(
2034 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
2035 if (clinit != nullptr && clinit->is_class_initializer()) {
2036 return clinit;
2037 }
2038 return nullptr;
2039 }
2040
2041 void InstanceKlass::call_class_initializer(TRAPS) {
2042 if (ReplayCompiles &&
2043 (ReplaySuppressInitializers == 1 ||
2044 (ReplaySuppressInitializers >= 2 && class_loader() != nullptr))) {
2045 // Hide the existence of the initializer for the purpose of replaying the compile
2046 return;
2047 }
2048
2049 #if INCLUDE_CDS
2050 // This is needed to ensure the consistency of the archived heap objects.
2051 if (has_aot_initialized_mirror() && CDSConfig::is_loading_heap()) {
2052 AOTClassInitializer::call_runtime_setup(THREAD, this);
2053 return;
2054 } else if (has_archived_enum_objs()) {
2055 assert(in_aot_cache(), "must be");
2056 bool initialized = CDSEnumKlass::initialize_enum_klass(this, CHECK);
2057 if (initialized) {
2058 return;
2059 }
2060 }
2061 #endif
2062
2063 methodHandle h_method(THREAD, class_initializer());
2064 assert(!is_initialized(), "we cannot initialize twice");
2065 LogTarget(Info, class, init) lt;
2066 if (lt.is_enabled()) {
2067 ResourceMark rm(THREAD);
2068 LogStream ls(lt);
2069 ls.print("%d Initializing ", call_class_initializer_counter++);
2070 name()->print_value_on(&ls);
2071 ls.print_cr("%s (" PTR_FORMAT ") by thread \"%s\"",
2072 h_method() == nullptr ? "(no method)" : "", p2i(this),
2073 THREAD->name());
2074 }
2075 if (h_method() != nullptr) {
2076 ThreadInClassInitializer ticl(THREAD, this); // Track class being initialized
2077 JavaCallArguments args; // No arguments
2078 JavaValue result(T_VOID);
2079 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
2080 }
2081 }
2082
2083 // If a class that implements this interface is initialized, is the JVM required
2084 // to first execute a <clinit> method declared in this interface,
2085 // or (if also_check_supers==true) any of the super types of this interface?
2086 //
2087 // JVMS 5.5. Initialization, step 7: Next, if C is a class rather than
2088 // an interface, then let SC be its superclass and let SI1, ..., SIn
2089 // be all superinterfaces of C (whether direct or indirect) that
2090 // declare at least one non-abstract, non-static method.
2091 //
2092 // So when an interface is initialized, it does not look at its
2093 // supers. But a proper class will ensure that all of its supers have
2094 // run their <clinit> methods, except that it disregards interfaces
2095 // that lack a non-static concrete method (i.e., a default method).
2096 // Therefore, you should probably call this method only when the
2097 // current class is a super of some proper class, not an interface.
2098 bool InstanceKlass::interface_needs_clinit_execution_as_super(bool also_check_supers) const {
2099 assert(is_interface(), "must be");
2100
2101 if (!has_nonstatic_concrete_methods()) {
2102 // quick check: no nonstatic concrete methods are declared by this or any super interfaces
2103 return false;
2104 }
2105
2106 // JVMS 5.5. Initialization
2107 // ...If C is an interface that declares a non-abstract,
2108 // non-static method, the initialization of a class that
2109 // implements C directly or indirectly.
2110 if (declares_nonstatic_concrete_methods() && class_initializer() != nullptr) {
2111 return true;
2112 }
2113 if (also_check_supers) {
2114 Array<InstanceKlass*>* all_ifs = transitive_interfaces();
2115 for (int i = 0; i < all_ifs->length(); ++i) {
2116 InstanceKlass* super_intf = all_ifs->at(i);
2117 if (super_intf->declares_nonstatic_concrete_methods() && super_intf->class_initializer() != nullptr) {
2118 return true;
2119 }
2120 }
2121 }
2122 return false;
2123 }
2124
2125 void InstanceKlass::mask_for(const methodHandle& method, int bci,
2126 InterpreterOopMap* entry_for) {
2127 // Lazily create the _oop_map_cache at first request.
2128 // Load_acquire is needed to safely get instance published with CAS by another thread.
2129 OopMapCache* oop_map_cache = AtomicAccess::load_acquire(&_oop_map_cache);
2130 if (oop_map_cache == nullptr) {
2131 // Try to install new instance atomically.
2132 oop_map_cache = new OopMapCache();
2133 OopMapCache* other = AtomicAccess::cmpxchg(&_oop_map_cache, (OopMapCache*)nullptr, oop_map_cache);
2134 if (other != nullptr) {
2135 // Someone else managed to install before us, ditch local copy and use the existing one.
2136 delete oop_map_cache;
2137 oop_map_cache = other;
2138 }
2139 }
2140 // _oop_map_cache is constant after init; lookup below does its own locking.
2141 oop_map_cache->lookup(method, bci, entry_for);
2142 }
2143
2144
2145 FieldInfo InstanceKlass::field(int index) const {
2146 for (AllFieldStream fs(this); !fs.done(); fs.next()) {
2147 if (fs.index() == index) {
2148 return fs.to_FieldInfo();
2149 }
2150 }
2151 fatal("Field not found");
2152 return FieldInfo();
2153 }
2154
2155 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
2156 JavaFieldStream fs(this);
2157 if (fs.lookup(name, sig)) {
2158 assert(fs.name() == name, "name must match");
2159 assert(fs.signature() == sig, "signature must match");
2160 fd->reinitialize(this, fs.to_FieldInfo());
2161 return true;
2162 }
2163 return false;
2164 }
2165
2166 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd, bool also_internal) const {
2167 if (!also_internal) {
2168 return find_local_field( name, sig, fd);
2169 }
2170
2171 for (AllFieldStream fs(this); !fs.done(); fs.next()) {
2172 if (fs.name() == name && fs.signature() == sig) {
2173 fd->reinitialize(this, fs.to_FieldInfo());
2174 return true;
2175 }
2176 }
2177 return false;
2178 }
2179
2180 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
2181 const int n = local_interfaces()->length();
2182 for (int i = 0; i < n; i++) {
2183 InstanceKlass* intf1 = local_interfaces()->at(i);
2184 assert(intf1->is_interface(), "just checking type");
2185 // search for field in current interface
2186 if (intf1->find_local_field(name, sig, fd)) {
2187 assert(fd->is_static(), "interface field must be static");
2188 return intf1;
2189 }
2190 // search for field in direct superinterfaces
2191 Klass* intf2 = intf1->find_interface_field(name, sig, fd);
2192 if (intf2 != nullptr) return intf2;
2193 }
2194 // otherwise field lookup fails
2195 return nullptr;
2196 }
2197
2198
2199 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
2200 // search order according to newest JVM spec (5.4.3.2, p.167).
2201 // 1) search for field in current klass
2202 if (find_local_field(name, sig, fd)) {
2203 return const_cast<InstanceKlass*>(this);
2204 }
2205 // 2) search for field recursively in direct superinterfaces
2206 { Klass* intf = find_interface_field(name, sig, fd);
2207 if (intf != nullptr) return intf;
2208 }
2209 // 3) apply field lookup recursively if superclass exists
2210 { InstanceKlass* supr = super();
2211 if (supr != nullptr) return supr->find_field(name, sig, fd);
2212 }
2213 // 4) otherwise field lookup fails
2214 return nullptr;
2215 }
2216
2217
2218 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
2219 // search order according to newest JVM spec (5.4.3.2, p.167).
2220 // 1) search for field in current klass
2221 if (find_local_field(name, sig, fd)) {
2222 if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
2223 }
2224 // 2) search for field recursively in direct superinterfaces
2225 if (is_static) {
2226 Klass* intf = find_interface_field(name, sig, fd);
2227 if (intf != nullptr) return intf;
2228 }
2229 // 3) apply field lookup recursively if superclass exists
2230 { InstanceKlass* supr = super();
2231 if (supr != nullptr) return supr->find_field(name, sig, is_static, fd);
2232 }
2233 // 4) otherwise field lookup fails
2234 return nullptr;
2235 }
2236
2237 bool InstanceKlass::contains_field_offset(int offset) {
2238 if (this->is_inline_klass()) {
2239 InlineKlass* vk = InlineKlass::cast(this);
2240 return offset >= vk->payload_offset() && offset < (vk->payload_offset() + vk->payload_size_in_bytes());
2241 } else {
2242 fieldDescriptor fd;
2243 return find_field_from_offset(offset, false, &fd);
2244 }
2245 }
2246
2247 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
2248 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
2249 if (fs.offset() == offset) {
2250 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.to_FieldInfo());
2251 if (fd->is_static() == is_static) return true;
2252 }
2253 }
2254 return false;
2255 }
2256
2257
2258 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
2259 const InstanceKlass* klass = this;
2260 while (klass != nullptr) {
2261 if (klass->find_local_field_from_offset(offset, is_static, fd)) {
2262 return true;
2263 }
2264 klass = klass->super();
2265 }
2266 return false;
2267 }
2268
2269 bool InstanceKlass::find_local_flat_field_containing_offset(int offset, fieldDescriptor* fd) const {
2270 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
2271 if (!fs.is_flat()) {
2272 continue;
2273 }
2274
2275 if (fs.offset() > offset) {
2276 continue;
2277 }
2278
2279 const int offset_in_flat_field = offset - fs.offset();
2280 const InlineLayoutInfo layout_info = inline_layout_info(fs.index());
2281 const int field_size = layout_info.klass()->layout_size_in_bytes(layout_info.kind());
2282
2283 assert(LayoutKindHelper::is_flat(layout_info.kind()), "Must be flat");
2284
2285 if (offset_in_flat_field < field_size) {
2286 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.to_FieldInfo());
2287 assert(!fd->is_static(), "Static fields are not flattened");
2288
2289 return true;
2290 }
2291 }
2292
2293 return false;
2294 }
2295
2296 bool InstanceKlass::find_flat_field_containing_offset(int offset, fieldDescriptor* fd) const {
2297 const InstanceKlass* klass = this;
2298 while (klass != nullptr) {
2299 if (klass->find_local_flat_field_containing_offset(offset, fd)) {
2300 return true;
2301 }
2302
2303 klass = klass->super();
2304 }
2305
2306 return false;
2307 }
2308
2309 void InstanceKlass::methods_do(void f(Method* method)) {
2310 // Methods aren't stable until they are loaded. This can be read outside
2311 // a lock through the ClassLoaderData for profiling
2312 // Redefined scratch classes are on the list and need to be cleaned
2313 if (!is_loaded() && !is_scratch_class()) {
2314 return;
2315 }
2316
2317 int len = methods()->length();
2318 for (int index = 0; index < len; index++) {
2319 Method* m = methods()->at(index);
2320 assert(m->is_method(), "must be method");
2321 f(m);
2322 }
2323 }
2324
2325
2326 void InstanceKlass::do_local_static_fields(FieldClosure* cl) {
2327 for (AllFieldStream fs(this); !fs.done(); fs.next()) {
2328 if (fs.access_flags().is_static()) {
2329 fieldDescriptor& fd = fs.field_descriptor();
2330 cl->do_field(&fd);
2331 }
2332 }
2333 }
2334
2335
2336 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) {
2337 for (AllFieldStream fs(this); !fs.done(); fs.next()) {
2338 if (fs.access_flags().is_static()) {
2339 fieldDescriptor& fd = fs.field_descriptor();
2340 f(&fd, mirror, CHECK);
2341 }
2342 }
2343 }
2344
2345 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) {
2346 InstanceKlass* super = this->super();
2347 if (super != nullptr) {
2348 super->do_nonstatic_fields(cl);
2349 }
2350 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
2351 fieldDescriptor& fd = fs.field_descriptor();
2352 if (!fd.is_static()) {
2353 cl->do_field(&fd);
2354 }
2355 }
2356 }
2357
2358 static int compare_fields_by_offset(FieldInfo* a, FieldInfo* b) {
2359 return a->offset() - b->offset();
2360 }
2361
2362 void InstanceKlass::print_nonstatic_fields(FieldClosure* cl) {
2363 InstanceKlass* super = this->super();
2364 if (super != nullptr) {
2365 super->print_nonstatic_fields(cl);
2366 }
2367 ResourceMark rm;
2368 // In DebugInfo nonstatic fields are sorted by offset.
2369 GrowableArray<FieldInfo> fields_sorted;
2370 for (AllFieldStream fs(this); !fs.done(); fs.next()) {
2371 if (!fs.access_flags().is_static()) {
2372 fields_sorted.push(fs.to_FieldInfo());
2373 }
2374 }
2375 int length = fields_sorted.length();
2376 if (length > 0) {
2377 fields_sorted.sort(compare_fields_by_offset);
2378 fieldDescriptor fd;
2379 for (int i = 0; i < length; i++) {
2380 fd.reinitialize(this, fields_sorted.at(i));
2381 assert(!fd.is_static() && fd.offset() == checked_cast<int>(fields_sorted.at(i).offset()), "only nonstatic fields");
2382 cl->do_field(&fd);
2383 }
2384 }
2385 }
2386
2387 #ifdef ASSERT
2388 static int linear_search(const Array<Method*>* methods,
2389 const Symbol* name,
2390 const Symbol* signature) {
2391 const int len = methods->length();
2392 for (int index = 0; index < len; index++) {
2393 const Method* const m = methods->at(index);
2394 assert(m->is_method(), "must be method");
2395 if (m->signature() == signature && m->name() == name) {
2396 return index;
2397 }
2398 }
2399 return -1;
2400 }
2401 #endif
2402
2403 bool InstanceKlass::_disable_method_binary_search = false;
2404
2405 NOINLINE int linear_search(const Array<Method*>* methods, const Symbol* name) {
2406 int len = methods->length();
2407 int l = 0;
2408 int h = len - 1;
2409 while (l <= h) {
2410 Method* m = methods->at(l);
2411 if (m->name() == name) {
2412 return l;
2413 }
2414 l++;
2415 }
2416 return -1;
2417 }
2418
2419 inline int InstanceKlass::quick_search(const Array<Method*>* methods, const Symbol* name) {
2420 if (_disable_method_binary_search) {
2421 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
2422 // At the final stage of dynamic dumping, the methods array may not be sorted
2423 // by ascending addresses of their names, so we can't use binary search anymore.
2424 // However, methods with the same name are still laid out consecutively inside the
2425 // methods array, so let's look for the first one that matches.
2426 return linear_search(methods, name);
2427 }
2428
2429 int len = methods->length();
2430 int l = 0;
2431 int h = len - 1;
2432
2433 // methods are sorted by ascending addresses of their names, so do binary search
2434 while (l <= h) {
2435 int mid = (l + h) >> 1;
2436 Method* m = methods->at(mid);
2437 assert(m->is_method(), "must be method");
2438 int res = m->name()->fast_compare(name);
2439 if (res == 0) {
2440 return mid;
2441 } else if (res < 0) {
2442 l = mid + 1;
2443 } else {
2444 h = mid - 1;
2445 }
2446 }
2447 return -1;
2448 }
2449
2450 // find_method looks up the name/signature in the local methods array
2451 Method* InstanceKlass::find_method(const Symbol* name,
2452 const Symbol* signature) const {
2453 return find_method_impl(name, signature,
2454 OverpassLookupMode::find,
2455 StaticLookupMode::find,
2456 PrivateLookupMode::find);
2457 }
2458
2459 Method* InstanceKlass::find_method_impl(const Symbol* name,
2460 const Symbol* signature,
2461 OverpassLookupMode overpass_mode,
2462 StaticLookupMode static_mode,
2463 PrivateLookupMode private_mode) const {
2464 return InstanceKlass::find_method_impl(methods(),
2465 name,
2466 signature,
2467 overpass_mode,
2468 static_mode,
2469 private_mode);
2470 }
2471
2472 // find_instance_method looks up the name/signature in the local methods array
2473 // and skips over static methods
2474 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods,
2475 const Symbol* name,
2476 const Symbol* signature,
2477 PrivateLookupMode private_mode) {
2478 Method* const meth = InstanceKlass::find_method_impl(methods,
2479 name,
2480 signature,
2481 OverpassLookupMode::find,
2482 StaticLookupMode::skip,
2483 private_mode);
2484 assert(((meth == nullptr) || !meth->is_static()),
2485 "find_instance_method should have skipped statics");
2486 return meth;
2487 }
2488
2489 // find_instance_method looks up the name/signature in the local methods array
2490 // and skips over static methods
2491 Method* InstanceKlass::find_instance_method(const Symbol* name,
2492 const Symbol* signature,
2493 PrivateLookupMode private_mode) const {
2494 return InstanceKlass::find_instance_method(methods(), name, signature, private_mode);
2495 }
2496
2497 // Find looks up the name/signature in the local methods array
2498 // and filters on the overpass, static and private flags
2499 // This returns the first one found
2500 // note that the local methods array can have up to one overpass, one static
2501 // and one instance (private or not) with the same name/signature
2502 Method* InstanceKlass::find_local_method(const Symbol* name,
2503 const Symbol* signature,
2504 OverpassLookupMode overpass_mode,
2505 StaticLookupMode static_mode,
2506 PrivateLookupMode private_mode) const {
2507 return InstanceKlass::find_method_impl(methods(),
2508 name,
2509 signature,
2510 overpass_mode,
2511 static_mode,
2512 private_mode);
2513 }
2514
2515 // Find looks up the name/signature in the local methods array
2516 // and filters on the overpass, static and private flags
2517 // This returns the first one found
2518 // note that the local methods array can have up to one overpass, one static
2519 // and one instance (private or not) with the same name/signature
2520 Method* InstanceKlass::find_local_method(const Array<Method*>* methods,
2521 const Symbol* name,
2522 const Symbol* signature,
2523 OverpassLookupMode overpass_mode,
2524 StaticLookupMode static_mode,
2525 PrivateLookupMode private_mode) {
2526 return InstanceKlass::find_method_impl(methods,
2527 name,
2528 signature,
2529 overpass_mode,
2530 static_mode,
2531 private_mode);
2532 }
2533
2534 Method* InstanceKlass::find_method(const Array<Method*>* methods,
2535 const Symbol* name,
2536 const Symbol* signature) {
2537 return InstanceKlass::find_method_impl(methods,
2538 name,
2539 signature,
2540 OverpassLookupMode::find,
2541 StaticLookupMode::find,
2542 PrivateLookupMode::find);
2543 }
2544
2545 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods,
2546 const Symbol* name,
2547 const Symbol* signature,
2548 OverpassLookupMode overpass_mode,
2549 StaticLookupMode static_mode,
2550 PrivateLookupMode private_mode) {
2551 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode);
2552 return hit >= 0 ? methods->at(hit): nullptr;
2553 }
2554
2555 // true if method matches signature and conforms to skipping_X conditions.
2556 static bool method_matches(const Method* m,
2557 const Symbol* signature,
2558 bool skipping_overpass,
2559 bool skipping_static,
2560 bool skipping_private) {
2561 return ((m->signature() == signature) &&
2562 (!skipping_overpass || !m->is_overpass()) &&
2563 (!skipping_static || !m->is_static()) &&
2564 (!skipping_private || !m->is_private()));
2565 }
2566
2567 // Used directly for default_methods to find the index into the
2568 // default_vtable_indices, and indirectly by find_method
2569 // find_method_index looks in the local methods array to return the index
2570 // of the matching name/signature. If, overpass methods are being ignored,
2571 // the search continues to find a potential non-overpass match. This capability
2572 // is important during method resolution to prefer a static method, for example,
2573 // over an overpass method.
2574 // There is the possibility in any _method's array to have the same name/signature
2575 // for a static method, an overpass method and a local instance method
2576 // To correctly catch a given method, the search criteria may need
2577 // to explicitly skip the other two. For local instance methods, it
2578 // is often necessary to skip private methods
2579 int InstanceKlass::find_method_index(const Array<Method*>* methods,
2580 const Symbol* name,
2581 const Symbol* signature,
2582 OverpassLookupMode overpass_mode,
2583 StaticLookupMode static_mode,
2584 PrivateLookupMode private_mode) {
2585 const bool skipping_overpass = (overpass_mode == OverpassLookupMode::skip);
2586 const bool skipping_static = (static_mode == StaticLookupMode::skip);
2587 const bool skipping_private = (private_mode == PrivateLookupMode::skip);
2588 const int hit = quick_search(methods, name);
2589 if (hit != -1) {
2590 const Method* const m = methods->at(hit);
2591
2592 // Do linear search to find matching signature. First, quick check
2593 // for common case, ignoring overpasses if requested.
2594 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
2595 return hit;
2596 }
2597
2598 // search downwards through overloaded methods
2599 int i;
2600 for (i = hit - 1; i >= 0; --i) {
2601 const Method* const m = methods->at(i);
2602 assert(m->is_method(), "must be method");
2603 if (m->name() != name) {
2604 break;
2605 }
2606 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
2607 return i;
2608 }
2609 }
2610 // search upwards
2611 for (i = hit + 1; i < methods->length(); ++i) {
2612 const Method* const m = methods->at(i);
2613 assert(m->is_method(), "must be method");
2614 if (m->name() != name) {
2615 break;
2616 }
2617 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
2618 return i;
2619 }
2620 }
2621 // not found
2622 #ifdef ASSERT
2623 const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 :
2624 linear_search(methods, name, signature);
2625 assert(-1 == index, "binary search should have found entry %d", index);
2626 #endif
2627 }
2628 return -1;
2629 }
2630
2631 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const {
2632 return find_method_by_name(methods(), name, end);
2633 }
2634
2635 int InstanceKlass::find_method_by_name(const Array<Method*>* methods,
2636 const Symbol* name,
2637 int* end_ptr) {
2638 assert(end_ptr != nullptr, "just checking");
2639 int start = quick_search(methods, name);
2640 int end = start + 1;
2641 if (start != -1) {
2642 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
2643 while (end < methods->length() && (methods->at(end))->name() == name) ++end;
2644 *end_ptr = end;
2645 return start;
2646 }
2647 return -1;
2648 }
2649
2650 // uncached_lookup_method searches both the local class methods array and all
2651 // superclasses methods arrays, skipping any overpass methods in superclasses,
2652 // and possibly skipping private methods.
2653 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
2654 const Symbol* signature,
2655 OverpassLookupMode overpass_mode,
2656 PrivateLookupMode private_mode) const {
2657 OverpassLookupMode overpass_local_mode = overpass_mode;
2658 const InstanceKlass* klass = this;
2659 while (klass != nullptr) {
2660 Method* const method = klass->find_method_impl(name,
2661 signature,
2662 overpass_local_mode,
2663 StaticLookupMode::find,
2664 private_mode);
2665 if (method != nullptr) {
2666 return method;
2667 }
2668 if (name == vmSymbols::object_initializer_name()) {
2669 break; // <init> is never inherited
2670 }
2671 klass = klass->super();
2672 overpass_local_mode = OverpassLookupMode::skip; // Always ignore overpass methods in superclasses
2673 }
2674 return nullptr;
2675 }
2676
2677 #ifdef ASSERT
2678 // search through class hierarchy and return true if this class or
2679 // one of the superclasses was redefined
2680 bool InstanceKlass::has_redefined_this_or_super() const {
2681 const InstanceKlass* klass = this;
2682 while (klass != nullptr) {
2683 if (klass->has_been_redefined()) {
2684 return true;
2685 }
2686 klass = klass->super();
2687 }
2688 return false;
2689 }
2690 #endif
2691
2692 // lookup a method in the default methods list then in all transitive interfaces
2693 // Do NOT return private or static methods
2694 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
2695 Symbol* signature) const {
2696 Method* m = nullptr;
2697 if (default_methods() != nullptr) {
2698 m = find_method(default_methods(), name, signature);
2699 }
2700 // Look up interfaces
2701 if (m == nullptr) {
2702 m = lookup_method_in_all_interfaces(name, signature, DefaultsLookupMode::find);
2703 }
2704 return m;
2705 }
2706
2707 // lookup a method in all the interfaces that this class implements
2708 // Do NOT return private or static methods, new in JDK8 which are not externally visible
2709 // They should only be found in the initial InterfaceMethodRef
2710 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
2711 Symbol* signature,
2712 DefaultsLookupMode defaults_mode) const {
2713 Array<InstanceKlass*>* all_ifs = transitive_interfaces();
2714 int num_ifs = all_ifs->length();
2715 InstanceKlass *ik = nullptr;
2716 for (int i = 0; i < num_ifs; i++) {
2717 ik = all_ifs->at(i);
2718 Method* m = ik->lookup_method(name, signature);
2719 if (m != nullptr && m->is_public() && !m->is_static() &&
2720 ((defaults_mode != DefaultsLookupMode::skip) || !m->is_default_method())) {
2721 return m;
2722 }
2723 }
2724 return nullptr;
2725 }
2726
2727 PrintClassClosure::PrintClassClosure(outputStream* st, bool verbose)
2728 :_st(st), _verbose(verbose) {
2729 ResourceMark rm;
2730 _st->print("%-18s ", "KlassAddr");
2731 _st->print("%-4s ", "Size");
2732 _st->print("%-20s ", "State");
2733 _st->print("%-7s ", "Flags");
2734 _st->print("%-5s ", "ClassName");
2735 _st->cr();
2736 }
2737
2738 void PrintClassClosure::do_klass(Klass* k) {
2739 ResourceMark rm;
2740 // klass pointer
2741 _st->print(PTR_FORMAT " ", p2i(k));
2742 // klass size
2743 _st->print("%4d ", k->size());
2744 // initialization state
2745 if (k->is_instance_klass()) {
2746 _st->print("%-20s ",InstanceKlass::cast(k)->init_state_name());
2747 } else {
2748 _st->print("%-20s ","");
2749 }
2750 // misc flags(Changes should synced with ClassesDCmd::ClassesDCmd help doc)
2751 char buf[10];
2752 int i = 0;
2753 if (k->has_finalizer()) buf[i++] = 'F';
2754 if (k->is_instance_klass()) {
2755 InstanceKlass* ik = InstanceKlass::cast(k);
2756 if (ik->has_final_method()) buf[i++] = 'f';
2757 if (ik->is_rewritten()) buf[i++] = 'W';
2758 if (ik->is_contended()) buf[i++] = 'C';
2759 if (ik->has_been_redefined()) buf[i++] = 'R';
2760 if (ik->in_aot_cache()) buf[i++] = 'S';
2761 }
2762 buf[i++] = '\0';
2763 _st->print("%-7s ", buf);
2764 // klass name
2765 _st->print("%-5s ", k->external_name());
2766 // end
2767 _st->cr();
2768 if (_verbose) {
2769 k->print_on(_st);
2770 }
2771 }
2772
2773 /* jni_id_for for jfieldIds only */
2774 JNIid* InstanceKlass::jni_id_for(int offset) {
2775 MutexLocker ml(JfieldIdCreation_lock);
2776 JNIid* probe = jni_ids() == nullptr ? nullptr : jni_ids()->find(offset);
2777 if (probe == nullptr) {
2778 // Allocate new static field identifier
2779 probe = new JNIid(this, offset, jni_ids());
2780 set_jni_ids(probe);
2781 }
2782 return probe;
2783 }
2784
2785 u2 InstanceKlass::enclosing_method_data(int offset) const {
2786 const Array<jushort>* const inner_class_list = inner_classes();
2787 if (inner_class_list == nullptr) {
2788 return 0;
2789 }
2790 const int length = inner_class_list->length();
2791 if (length % inner_class_next_offset == 0) {
2792 return 0;
2793 }
2794 const int index = length - enclosing_method_attribute_size;
2795 assert(offset < enclosing_method_attribute_size, "invalid offset");
2796 return inner_class_list->at(index + offset);
2797 }
2798
2799 void InstanceKlass::set_enclosing_method_indices(u2 class_index,
2800 u2 method_index) {
2801 Array<jushort>* inner_class_list = inner_classes();
2802 assert (inner_class_list != nullptr, "_inner_classes list is not set up");
2803 int length = inner_class_list->length();
2804 if (length % inner_class_next_offset == enclosing_method_attribute_size) {
2805 int index = length - enclosing_method_attribute_size;
2806 inner_class_list->at_put(
2807 index + enclosing_method_class_index_offset, class_index);
2808 inner_class_list->at_put(
2809 index + enclosing_method_method_index_offset, method_index);
2810 }
2811 }
2812
2813 jmethodID InstanceKlass::update_jmethod_id(jmethodID* jmeths, Method* method, int idnum) {
2814 if (method->is_old() && !method->is_obsolete()) {
2815 // If the method passed in is old (but not obsolete), use the current version.
2816 method = method_with_idnum((int)idnum);
2817 assert(method != nullptr, "old and but not obsolete, so should exist");
2818 }
2819 jmethodID new_id = Method::make_jmethod_id(class_loader_data(), method);
2820 AtomicAccess::release_store(&jmeths[idnum + 1], new_id);
2821 return new_id;
2822 }
2823
2824 // Allocate the jmethodID cache.
2825 static jmethodID* create_jmethod_id_cache(size_t size) {
2826 jmethodID* jmeths = NEW_C_HEAP_ARRAY(jmethodID, size + 1, mtClass);
2827 memset(jmeths, 0, (size + 1) * sizeof(jmethodID));
2828 // cache size is stored in element[0], other elements offset by one
2829 jmeths[0] = (jmethodID)size;
2830 return jmeths;
2831 }
2832
2833 // When reading outside a lock, use this.
2834 jmethodID* InstanceKlass::methods_jmethod_ids_acquire() const {
2835 return AtomicAccess::load_acquire(&_methods_jmethod_ids);
2836 }
2837
2838 void InstanceKlass::release_set_methods_jmethod_ids(jmethodID* jmeths) {
2839 AtomicAccess::release_store(&_methods_jmethod_ids, jmeths);
2840 }
2841
2842 // Lookup or create a jmethodID.
2843 jmethodID InstanceKlass::get_jmethod_id(Method* method) {
2844 int idnum = method->method_idnum();
2845 jmethodID* jmeths = methods_jmethod_ids_acquire();
2846
2847 // We use a double-check locking idiom here because this cache is
2848 // performance sensitive. In the normal system, this cache only
2849 // transitions from null to non-null which is safe because we use
2850 // release_set_methods_jmethod_ids() to advertise the new cache.
2851 // A partially constructed cache should never be seen by a racing
2852 // thread. We also use release_store() to save a new jmethodID
2853 // in the cache so a partially constructed jmethodID should never be
2854 // seen either. Cache reads of existing jmethodIDs proceed without a
2855 // lock, but cache writes of a new jmethodID requires uniqueness and
2856 // creation of the cache itself requires no leaks so a lock is
2857 // acquired in those two cases.
2858 //
2859 // If the RedefineClasses() API has been used, then this cache grows
2860 // in the redefinition safepoint.
2861
2862 if (jmeths == nullptr) {
2863 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2864 jmeths = _methods_jmethod_ids;
2865 // Still null?
2866 if (jmeths == nullptr) {
2867 size_t size = idnum_allocated_count();
2868 assert(size > (size_t)idnum, "should already have space");
2869 jmeths = create_jmethod_id_cache(size);
2870 jmethodID new_id = update_jmethod_id(jmeths, method, idnum);
2871
2872 // publish jmeths
2873 release_set_methods_jmethod_ids(jmeths);
2874 return new_id;
2875 }
2876 }
2877
2878 jmethodID id = AtomicAccess::load_acquire(&jmeths[idnum + 1]);
2879 if (id == nullptr) {
2880 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2881 id = jmeths[idnum + 1];
2882 // Still null?
2883 if (id == nullptr) {
2884 return update_jmethod_id(jmeths, method, idnum);
2885 }
2886 }
2887 return id;
2888 }
2889
2890 void InstanceKlass::update_methods_jmethod_cache() {
2891 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
2892 jmethodID* cache = _methods_jmethod_ids;
2893 if (cache != nullptr) {
2894 size_t size = idnum_allocated_count();
2895 size_t old_size = (size_t)cache[0];
2896 if (old_size < size + 1) {
2897 // Allocate a larger one and copy entries to the new one.
2898 // They've already been updated to point to new methods where applicable (i.e., not obsolete).
2899 jmethodID* new_cache = create_jmethod_id_cache(size);
2900
2901 for (int i = 1; i <= (int)old_size; i++) {
2902 new_cache[i] = cache[i];
2903 }
2904 _methods_jmethod_ids = new_cache;
2905 FREE_C_HEAP_ARRAY(cache);
2906 }
2907 }
2908 }
2909
2910 // Make a jmethodID for all methods in this class. This makes getting all method
2911 // ids much, much faster with classes with more than 8
2912 // methods, and has a *substantial* effect on performance with jvmti
2913 // code that loads all jmethodIDs for all classes.
2914 void InstanceKlass::make_methods_jmethod_ids() {
2915 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2916 jmethodID* jmeths = _methods_jmethod_ids;
2917 if (jmeths == nullptr) {
2918 jmeths = create_jmethod_id_cache(idnum_allocated_count());
2919 release_set_methods_jmethod_ids(jmeths);
2920 }
2921
2922 int length = methods()->length();
2923 for (int index = 0; index < length; index++) {
2924 Method* m = methods()->at(index);
2925 int idnum = m->method_idnum();
2926 assert(!m->is_old(), "should not have old methods or I'm confused");
2927 jmethodID id = AtomicAccess::load_acquire(&jmeths[idnum + 1]);
2928 if (!m->is_overpass() && // skip overpasses
2929 id == nullptr) {
2930 id = Method::make_jmethod_id(class_loader_data(), m);
2931 AtomicAccess::release_store(&jmeths[idnum + 1], id);
2932 }
2933 }
2934 }
2935
2936 // Lookup a jmethodID, null if not found. Do no blocking, no allocations, no handles
2937 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
2938 int idnum = method->method_idnum();
2939 jmethodID* jmeths = methods_jmethod_ids_acquire();
2940 return (jmeths != nullptr) ? jmeths[idnum + 1] : nullptr;
2941 }
2942
2943 inline DependencyContext InstanceKlass::dependencies() {
2944 DependencyContext dep_context(&_dep_context, &_dep_context_last_cleaned);
2945 return dep_context;
2946 }
2947
2948 void InstanceKlass::mark_dependent_nmethods(DeoptimizationScope* deopt_scope, KlassDepChange& changes) {
2949 dependencies().mark_dependent_nmethods(deopt_scope, changes);
2950 }
2951
2952 void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
2953 assert_lock_strong(CodeCache_lock);
2954 dependencies().add_dependent_nmethod(nm);
2955 }
2956
2957 void InstanceKlass::clean_dependency_context() {
2958 dependencies().clean_unloading_dependents();
2959 }
2960
2961 #ifndef PRODUCT
2962 void InstanceKlass::print_dependent_nmethods(bool verbose) {
2963 dependencies().print_dependent_nmethods(verbose);
2964 }
2965
2966 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
2967 return dependencies().is_dependent_nmethod(nm);
2968 }
2969 #endif //PRODUCT
2970
2971 void InstanceKlass::clean_weak_instanceklass_links() {
2972 clean_implementors_list();
2973 clean_method_data();
2974 }
2975
2976 void InstanceKlass::clean_implementors_list() {
2977 assert(is_loader_alive(), "this klass should be live");
2978 if (is_interface()) {
2979 assert (ClassUnloading, "only called for ClassUnloading");
2980 for (;;) {
2981 // Use load_acquire due to competing with inserts
2982 InstanceKlass* volatile* iklass = adr_implementor();
2983 assert(iklass != nullptr, "Klass must not be null");
2984 InstanceKlass* impl = AtomicAccess::load_acquire(iklass);
2985 if (impl != nullptr && !impl->is_loader_alive()) {
2986 // null this field, might be an unloaded instance klass or null
2987 if (AtomicAccess::cmpxchg(iklass, impl, (InstanceKlass*)nullptr) == impl) {
2988 // Successfully unlinking implementor.
2989 if (log_is_enabled(Trace, class, unload)) {
2990 ResourceMark rm;
2991 log_trace(class, unload)("unlinking class (implementor): %s", impl->external_name());
2992 }
2993 return;
2994 }
2995 } else {
2996 return;
2997 }
2998 }
2999 }
3000 }
3001
3002 void InstanceKlass::clean_method_data() {
3003 for (int m = 0; m < methods()->length(); m++) {
3004 MethodData* mdo = methods()->at(m)->method_data();
3005 if (mdo != nullptr) {
3006 mdo->clean_method_data(/*always_clean*/false);
3007 }
3008 }
3009 }
3010
3011 void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) {
3012 Klass::metaspace_pointers_do(it);
3013
3014 if (log_is_enabled(Trace, aot)) {
3015 ResourceMark rm;
3016 log_trace(aot)("Iter(InstanceKlass): %p (%s)", this, external_name());
3017 }
3018
3019 it->push(&_annotations);
3020 it->push((Klass**)&_array_klasses);
3021 if (!is_rewritten()) {
3022 it->push(&_constants, MetaspaceClosure::_writable);
3023 } else {
3024 it->push(&_constants);
3025 }
3026 it->push(&_inner_classes);
3027 #if INCLUDE_JVMTI
3028 it->push(&_previous_versions);
3029 #endif
3030 #if INCLUDE_CDS
3031 // For "old" classes with methods containing the jsr bytecode, the _methods array will
3032 // be rewritten during runtime (see Rewriter::rewrite_jsrs()) but they cannot be safely
3033 // checked here with ByteCodeStream. All methods that can't be verified are made writable.
3034 // The length check on the _methods is necessary because classes which don't have any
3035 // methods share the Universe::_the_empty_method_array which is in the RO region.
3036 if (_methods != nullptr && _methods->length() > 0 && !can_be_verified_at_dumptime()) {
3037 // To handle jsr bytecode, new Method* maybe stored into _methods
3038 it->push(&_methods, MetaspaceClosure::_writable);
3039 } else {
3040 #endif
3041 it->push(&_methods);
3042 #if INCLUDE_CDS
3043 }
3044 #endif
3045 it->push(&_default_methods);
3046 it->push(&_local_interfaces);
3047 it->push(&_transitive_interfaces);
3048 it->push(&_method_ordering);
3049 if (!is_rewritten()) {
3050 it->push(&_default_vtable_indices, MetaspaceClosure::_writable);
3051 } else {
3052 it->push(&_default_vtable_indices);
3053 }
3054
3055 it->push(&_fieldinfo_stream);
3056 it->push(&_fieldinfo_search_table);
3057 // _fields_status might be written into by Rewriter::scan_method() -> fd.set_has_initialized_final_update()
3058 it->push(&_fields_status, MetaspaceClosure::_writable);
3059
3060 if (itable_length() > 0) {
3061 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
3062 int method_table_offset_in_words = ioe->offset()/wordSize;
3063 int itable_offset_in_words = (int)(start_of_itable() - (intptr_t*)this);
3064
3065 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words)
3066 / itableOffsetEntry::size();
3067
3068 for (int i = 0; i < nof_interfaces; i ++, ioe ++) {
3069 if (ioe->interface_klass() != nullptr) {
3070 it->push(ioe->interface_klass_addr());
3071 itableMethodEntry* ime = ioe->first_method_entry(this);
3072 int n = klassItable::method_count_for_interface(ioe->interface_klass());
3073 for (int index = 0; index < n; index ++) {
3074 it->push(ime[index].method_addr());
3075 }
3076 }
3077 }
3078 }
3079
3080 it->push(&_nest_host);
3081 it->push(&_nest_members);
3082 it->push(&_permitted_subclasses);
3083 it->push(&_loadable_descriptors);
3084 it->push(&_acmp_maps_array, MetaspaceClosure::_writable);
3085 it->push(&_record_components);
3086 it->push(&_inline_layout_info_array, MetaspaceClosure::_writable);
3087
3088 if (CDSConfig::is_dumping_full_module_graph() && !defined_by_other_loaders()) {
3089 it->push(&_package_entry);
3090 }
3091 }
3092
3093 #if INCLUDE_CDS
3094 void InstanceKlass::remove_unshareable_info() {
3095
3096 if (is_linked()) {
3097 assert(can_be_verified_at_dumptime(), "must be");
3098 // Remember this so we can avoid walking the hierarchy at runtime.
3099 set_verified_at_dump_time();
3100 }
3101
3102 _misc_flags.set_has_init_deps_processed(false);
3103
3104 Klass::remove_unshareable_info();
3105
3106 if (SystemDictionaryShared::has_class_failed_verification(this)) {
3107 // Classes are attempted to link during dumping and may fail,
3108 // but these classes are still in the dictionary and class list in CLD.
3109 // If the class has failed verification, there is nothing else to remove.
3110 return;
3111 }
3112
3113 // Reset to the 'allocated' state to prevent any premature accessing to
3114 // a shared class at runtime while the class is still being loaded and
3115 // restored. A class' init_state is set to 'loaded' at runtime when it's
3116 // being added to class hierarchy (see InstanceKlass:::add_to_hierarchy()).
3117 _init_state = allocated;
3118
3119 { // Otherwise this needs to take out the Compile_lock.
3120 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
3121 init_implementor();
3122 }
3123
3124 // Call remove_unshareable_info() on other objects that belong to this class, except
3125 // for constants()->remove_unshareable_info(), which is called in a separate pass in
3126 // ArchiveBuilder::make_klasses_shareable(),
3127
3128 for (int i = 0; i < methods()->length(); i++) {
3129 Method* m = methods()->at(i);
3130 m->remove_unshareable_info();
3131 }
3132
3133 // do array classes also.
3134 if (array_klasses() != nullptr) {
3135 array_klasses()->remove_unshareable_info();
3136 }
3137
3138 // These are not allocated from metaspace. They are safe to set to nullptr.
3139 _source_debug_extension = nullptr;
3140 _dep_context = nullptr;
3141 _osr_nmethods_head = nullptr;
3142 #if INCLUDE_JVMTI
3143 _breakpoints = nullptr;
3144 _previous_versions = nullptr;
3145 _cached_class_file = nullptr;
3146 _jvmti_cached_class_field_map = nullptr;
3147 #endif
3148
3149 _init_thread = nullptr;
3150 _methods_jmethod_ids = nullptr;
3151 _jni_ids = nullptr;
3152 _oop_map_cache = nullptr;
3153 if (CDSConfig::is_dumping_method_handles() && HeapShared::is_lambda_proxy_klass(this)) {
3154 // keep _nest_host
3155 } else {
3156 // clear _nest_host to ensure re-load at runtime
3157 _nest_host = nullptr;
3158 }
3159 init_shared_package_entry();
3160 _dep_context_last_cleaned = 0;
3161 DEBUG_ONLY(_shared_class_load_count = 0);
3162
3163 remove_unshareable_flags();
3164
3165 DEBUG_ONLY(FieldInfoStream::validate_search_table(_constants, _fieldinfo_stream, _fieldinfo_search_table));
3166 }
3167
3168 void InstanceKlass::remove_unshareable_flags() {
3169 // clear all the flags/stats that shouldn't be in the archived version
3170 assert(!is_scratch_class(), "must be");
3171 assert(!has_been_redefined(), "must be");
3172 #if INCLUDE_JVMTI
3173 set_is_being_redefined(false);
3174 #endif
3175 set_has_resolved_methods(false);
3176 }
3177
3178 void InstanceKlass::remove_java_mirror() {
3179 Klass::remove_java_mirror();
3180
3181 // do array classes also.
3182 if (array_klasses() != nullptr) {
3183 array_klasses()->remove_java_mirror();
3184 }
3185 }
3186
3187 void InstanceKlass::init_shared_package_entry() {
3188 assert(CDSConfig::is_dumping_archive(), "must be");
3189 if (!CDSConfig::is_dumping_full_module_graph() || defined_by_other_loaders()) {
3190 _package_entry = nullptr;
3191 }
3192 }
3193
3194 void InstanceKlass::compute_has_loops_flag_for_methods() {
3195 Array<Method*>* methods = this->methods();
3196 for (int index = 0; index < methods->length(); ++index) {
3197 Method* m = methods->at(index);
3198 if (!m->is_overpass()) { // work around JDK-8305771
3199 m->compute_has_loops_flag();
3200 }
3201 }
3202 }
3203
3204 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain,
3205 PackageEntry* pkg_entry, TRAPS) {
3206 // InstanceKlass::add_to_hierarchy() sets the init_state to loaded
3207 // before the InstanceKlass is added to the SystemDictionary. Make
3208 // sure the current state is <loaded.
3209 assert(!is_loaded(), "invalid init state");
3210 assert(!shared_loading_failed(), "Must not try to load failed class again");
3211 set_package(loader_data, pkg_entry, CHECK);
3212 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
3213
3214 if (is_inline_klass()) {
3215 InlineKlass::cast(this)->initialize_calling_convention(CHECK);
3216 }
3217
3218 Array<Method*>* methods = this->methods();
3219 int num_methods = methods->length();
3220 for (int index = 0; index < num_methods; ++index) {
3221 methods->at(index)->restore_unshareable_info(CHECK);
3222 }
3223 #if INCLUDE_JVMTI
3224 if (JvmtiExport::has_redefined_a_class()) {
3225 // Reinitialize vtable because RedefineClasses may have changed some
3226 // entries in this vtable for super classes so the CDS vtable might
3227 // point to old or obsolete entries. RedefineClasses doesn't fix up
3228 // vtables in the shared system dictionary, only the main one.
3229 // It also redefines the itable too so fix that too.
3230 // First fix any default methods that point to a super class that may
3231 // have been redefined.
3232 bool trace_name_printed = false;
3233 adjust_default_methods(&trace_name_printed);
3234 if (verified_at_dump_time()) {
3235 // Initialize vtable and itable for classes which can be verified at dump time.
3236 // Unlinked classes such as old classes with major version < 50 cannot be verified
3237 // at dump time.
3238 vtable().initialize_vtable();
3239 itable().initialize_itable();
3240 }
3241 }
3242 #endif // INCLUDE_JVMTI
3243
3244 // restore constant pool resolved references
3245 constants()->restore_unshareable_info(CHECK);
3246
3247 // Restore acmp_maps java array from the version stored in metadata.
3248 // if it cannot be found in the archive
3249 if (Arguments::is_valhalla_enabled() && has_acmp_maps_offset() && java_mirror()->obj_field(_acmp_maps_offset) == nullptr) {
3250 int acmp_maps_size = _acmp_maps_array->length();
3251 typeArrayOop map = oopFactory::new_intArray(acmp_maps_size, CHECK);
3252 typeArrayHandle map_h(THREAD, map);
3253 for (int i = 0; i < acmp_maps_size; i++) {
3254 map_h->int_at_put(i, _acmp_maps_array->at(i));
3255 }
3256 java_mirror()->obj_field_put(_acmp_maps_offset, map_h());
3257 }
3258
3259 if (array_klasses() != nullptr) {
3260 // To get a consistent list of classes we need MultiArray_lock to ensure
3261 // array classes aren't observed while they are being restored.
3262 RecursiveLocker rl(MultiArray_lock, THREAD);
3263 assert(this == ObjArrayKlass::cast(array_klasses())->bottom_klass(), "sanity");
3264 // Array classes have null protection domain.
3265 // --> see ArrayKlass::complete_create_array_klass()
3266 if (class_loader_data() == nullptr) {
3267 ResourceMark rm(THREAD);
3268 log_debug(cds)(" loader_data %s ", loader_data == nullptr ? "nullptr" : "non null");
3269 log_debug(cds)(" this %s array_klasses %s ", this->name()->as_C_string(), array_klasses()->name()->as_C_string());
3270 }
3271 assert(!array_klasses()->is_refined_objArray_klass(), "must be non-refined objarrayklass");
3272 array_klasses()->restore_unshareable_info(class_loader_data(), Handle(), CHECK);
3273 }
3274
3275 // Initialize @ValueBased class annotation if not already set in the archived klass.
3276 if (DiagnoseSyncOnValueBasedClasses && has_value_based_class_annotation() && !is_value_based()) {
3277 set_is_value_based();
3278 }
3279
3280 DEBUG_ONLY(FieldInfoStream::validate_search_table(_constants, _fieldinfo_stream, _fieldinfo_search_table));
3281 }
3282
3283 bool InstanceKlass::can_be_verified_at_dumptime() const {
3284 if (CDSConfig::is_dumping_dynamic_archive() && AOTMetaspace::in_aot_cache(this)) {
3285 // This is a class that was dumped into the base archive, so we know
3286 // it was verified at dump time.
3287 return true;
3288 }
3289
3290 if (CDSConfig::is_preserving_verification_constraints()) {
3291 return true;
3292 }
3293
3294 if (CDSConfig::is_old_class_for_verifier(this)) {
3295 // The old verifier does not save verification constraints, so at run time
3296 // SystemDictionaryShared::check_verification_constraints() will not work for this class.
3297 return false;
3298 }
3299
3300 if (CDSConfig::is_dumping_final_static_archive() && fail_over_verified()) {
3301 // This is a class with version >50 but was verified with the old verifier in the training run,
3302 // which had -XX:+AOTClassLinking. However, we are now in the assembly run with -XX:-AOTClassLinking.
3303 // As SystemDictionaryShared::check_verification_constraints() does not support this case,
3304 // we must exclude this class.
3305 assert(!CDSConfig::is_dumping_aot_linked_classes(), "must be");
3306 return false;
3307 }
3308
3309 if (super() != nullptr && !super()->can_be_verified_at_dumptime()) {
3310 return false;
3311 }
3312 Array<InstanceKlass*>* interfaces = local_interfaces();
3313 int len = interfaces->length();
3314 for (int i = 0; i < len; i++) {
3315 if (!interfaces->at(i)->can_be_verified_at_dumptime()) {
3316 return false;
3317 }
3318 }
3319 return true;
3320 }
3321
3322 #endif // INCLUDE_CDS
3323
3324 #if INCLUDE_JVMTI
3325 static void clear_all_breakpoints(Method* m) {
3326 m->clear_all_breakpoints();
3327 }
3328 #endif
3329
3330 void InstanceKlass::unload_class(InstanceKlass* ik) {
3331
3332 if (ik->is_scratch_class()) {
3333 assert(ik->dependencies().is_empty(), "dependencies should be empty for scratch classes");
3334 return;
3335 }
3336 assert(ik->is_loaded(), "class should be loaded " PTR_FORMAT, p2i(ik));
3337
3338 // Release dependencies.
3339 ik->dependencies().remove_all_dependents();
3340
3341 // notify the debugger
3342 if (JvmtiExport::should_post_class_unload()) {
3343 JvmtiExport::post_class_unload(ik);
3344 }
3345
3346 // notify ClassLoadingService of class unload
3347 ClassLoadingService::notify_class_unloaded(ik);
3348
3349 SystemDictionaryShared::handle_class_unloading(ik);
3350
3351 if (log_is_enabled(Info, class, unload)) {
3352 ResourceMark rm;
3353 log_info(class, unload)("unloading class %s " PTR_FORMAT, ik->external_name(), p2i(ik));
3354 }
3355
3356 Thread* const current = Thread::current();
3357 Events::log_class_unloading(current, ik);
3358
3359 #if INCLUDE_JFR
3360 assert(ik != nullptr, "invariant");
3361 // For concurrent unloading, we need the ik, the cld, and the event
3362 // to end up in the correct JFR epoch, hence the acquisition of the
3363 // epoch shift lock before the event.commit().
3364 if (EventClassUnload::is_enabled()) {
3365 EventClassUnload event;
3366 event.set_unloadedClass(ik);
3367 event.set_definingClassLoader(ik->class_loader_data());
3368 ConditionalMutexLocker ml(JfrEpochShift_lock, UseShenandoahGC || UseZGC, Mutex::_no_safepoint_check_flag);
3369 event.commit();
3370 }
3371 #endif
3372 }
3373
3374 static void method_release_C_heap_structures(Method* m) {
3375 m->release_C_heap_structures();
3376 }
3377
3378 // Called also by InstanceKlass::deallocate_contents, with false for release_sub_metadata.
3379 void InstanceKlass::release_C_heap_structures(bool release_sub_metadata) {
3380 // Clean up C heap
3381 Klass::release_C_heap_structures();
3382
3383 // Deallocate and call destructors for MDO mutexes
3384 if (release_sub_metadata) {
3385 methods_do(method_release_C_heap_structures);
3386 }
3387
3388 // Deallocate oop map cache
3389 if (_oop_map_cache != nullptr) {
3390 delete _oop_map_cache;
3391 _oop_map_cache = nullptr;
3392 }
3393
3394 // Deallocate JNI identifiers for jfieldIDs
3395 JNIid::deallocate(jni_ids());
3396 set_jni_ids(nullptr);
3397
3398 jmethodID* jmeths = _methods_jmethod_ids;
3399 if (jmeths != nullptr) {
3400 release_set_methods_jmethod_ids(nullptr);
3401 FreeHeap(jmeths);
3402 }
3403
3404 assert(_dep_context == nullptr,
3405 "dependencies should already be cleaned");
3406
3407 #if INCLUDE_JVMTI
3408 // Deallocate breakpoint records
3409 if (breakpoints() != nullptr) {
3410 methods_do(clear_all_breakpoints);
3411 assert(breakpoints() == nullptr, "should have cleared breakpoints");
3412 }
3413
3414 // deallocate the cached class file
3415 if (_cached_class_file != nullptr) {
3416 os::free(_cached_class_file);
3417 _cached_class_file = nullptr;
3418 }
3419 #endif
3420
3421 FREE_C_HEAP_ARRAY(_source_debug_extension);
3422
3423 if (release_sub_metadata) {
3424 constants()->release_C_heap_structures();
3425 }
3426 }
3427
3428 // The constant pool is on stack if any of the methods are executing or
3429 // referenced by handles.
3430 bool InstanceKlass::on_stack() const {
3431 return _constants->on_stack();
3432 }
3433
3434 Symbol* InstanceKlass::source_file_name() const { return _constants->source_file_name(); }
3435 u2 InstanceKlass::source_file_name_index() const { return _constants->source_file_name_index(); }
3436 void InstanceKlass::set_source_file_name_index(u2 sourcefile_index) { _constants->set_source_file_name_index(sourcefile_index); }
3437
3438 Symbol* InstanceKlass::source_file_name(int version) const {
3439 // Return the source file name for this version of the classfile, if redefined with RedefineClasses
3440 const InstanceKlass* holder = get_klass_version(version);
3441 if (holder == nullptr) {
3442 // Redefined previous class has been cleaned up.
3443 return nullptr;
3444 } else {
3445 return holder->source_file_name();
3446 }
3447 }
3448
3449 // minor and major version numbers of class file
3450 u2 InstanceKlass::minor_version() const { return _constants->minor_version(); }
3451 void InstanceKlass::set_minor_version(u2 minor_version) { _constants->set_minor_version(minor_version); }
3452 u2 InstanceKlass::major_version() const { return _constants->major_version(); }
3453 void InstanceKlass::set_major_version(u2 major_version) { _constants->set_major_version(major_version); }
3454
3455 bool InstanceKlass::supports_inline_types() const {
3456 return major_version() >= Verifier::VALUE_TYPES_MAJOR_VERSION && minor_version() == Verifier::JAVA_PREVIEW_MINOR_VERSION;
3457 }
3458
3459 const InstanceKlass* InstanceKlass::get_klass_version(int version) const {
3460 for (const InstanceKlass* ik = this; ik != nullptr; ik = ik->previous_versions()) {
3461 if (ik->constants()->version() == version) {
3462 return ik;
3463 }
3464 }
3465 return nullptr;
3466 }
3467
3468 void InstanceKlass::set_source_debug_extension(const char* array, int length) {
3469 if (array == nullptr) {
3470 _source_debug_extension = nullptr;
3471 } else {
3472 // Adding one to the attribute length in order to store a null terminator
3473 // character could cause an overflow because the attribute length is
3474 // already coded with an u4 in the classfile, but in practice, it's
3475 // unlikely to happen.
3476 assert((length+1) > length, "Overflow checking");
3477 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
3478 for (int i = 0; i < length; i++) {
3479 sde[i] = array[i];
3480 }
3481 sde[length] = '\0';
3482 _source_debug_extension = sde;
3483 }
3484 }
3485
3486 Symbol* InstanceKlass::generic_signature() const { return _constants->generic_signature(); }
3487 u2 InstanceKlass::generic_signature_index() const { return _constants->generic_signature_index(); }
3488 void InstanceKlass::set_generic_signature_index(u2 sig_index) { _constants->set_generic_signature_index(sig_index); }
3489
3490 const char* InstanceKlass::signature_name() const {
3491 // Get the internal name as a c string
3492 const char* src = (const char*) (name()->as_C_string());
3493 const int src_length = (int)strlen(src);
3494
3495 char* dest = NEW_RESOURCE_ARRAY(char, src_length + 3);
3496
3497 // Add L as type indicator
3498 int dest_index = 0;
3499 dest[dest_index++] = JVM_SIGNATURE_CLASS;
3500
3501 // Add the actual class name
3502 for (int src_index = 0; src_index < src_length; ) {
3503 dest[dest_index++] = src[src_index++];
3504 }
3505
3506 if (is_hidden()) { // Replace the last '+' with a '.'.
3507 for (int index = (int)src_length; index > 0; index--) {
3508 if (dest[index] == '+') {
3509 dest[index] = JVM_SIGNATURE_DOT;
3510 break;
3511 }
3512 }
3513 }
3514
3515 // Add the semicolon and the null
3516 dest[dest_index++] = JVM_SIGNATURE_ENDCLASS;
3517 dest[dest_index] = '\0';
3518 return dest;
3519 }
3520
3521 ModuleEntry* InstanceKlass::module() const {
3522 if (is_hidden() &&
3523 in_unnamed_package() &&
3524 class_loader_data()->has_class_mirror_holder()) {
3525 // For a non-strong hidden class defined to an unnamed package,
3526 // its (class held) CLD will not have an unnamed module created for it.
3527 // Two choices to find the correct ModuleEntry:
3528 // 1. If hidden class is within a nest, use nest host's module
3529 // 2. Find the unnamed module off from the class loader
3530 // For now option #2 is used since a nest host is not set until
3531 // after the instance class is created in jvm_lookup_define_class().
3532 if (class_loader_data()->is_boot_class_loader_data()) {
3533 return ClassLoaderData::the_null_class_loader_data()->unnamed_module();
3534 } else {
3535 oop module = java_lang_ClassLoader::unnamedModule(class_loader_data()->class_loader());
3536 assert(java_lang_Module::is_instance(module), "Not an instance of java.lang.Module");
3537 return java_lang_Module::module_entry(module);
3538 }
3539 }
3540
3541 // Class is in a named package
3542 if (!in_unnamed_package()) {
3543 return _package_entry->module();
3544 }
3545
3546 // Class is in an unnamed package, return its loader's unnamed module
3547 return class_loader_data()->unnamed_module();
3548 }
3549
3550 bool InstanceKlass::in_javabase_module() const {
3551 return module()->name() == vmSymbols::java_base();
3552 }
3553
3554 void InstanceKlass::set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS) {
3555
3556 // ensure java/ packages only loaded by boot or platform builtin loaders
3557 // not needed for shared class since CDS does not archive prohibited classes.
3558 if (!in_aot_cache()) {
3559 check_prohibited_package(name(), loader_data, CHECK);
3560 }
3561
3562 if (in_aot_cache() && _package_entry != nullptr) {
3563 if (CDSConfig::is_using_full_module_graph() && _package_entry == pkg_entry) {
3564 // we can use the saved package
3565 assert(AOTMetaspace::in_aot_cache(_package_entry), "must be");
3566 return;
3567 } else {
3568 _package_entry = nullptr;
3569 }
3570 }
3571
3572 // ClassLoader::package_from_class_name has already incremented the refcount of the symbol
3573 // it returns, so we need to decrement it when the current function exits.
3574 TempNewSymbol from_class_name =
3575 (pkg_entry != nullptr) ? nullptr : ClassLoader::package_from_class_name(name());
3576
3577 Symbol* pkg_name;
3578 if (pkg_entry != nullptr) {
3579 pkg_name = pkg_entry->name();
3580 } else {
3581 pkg_name = from_class_name;
3582 }
3583
3584 if (pkg_name != nullptr && loader_data != nullptr) {
3585
3586 // Find in class loader's package entry table.
3587 _package_entry = pkg_entry != nullptr ? pkg_entry : loader_data->packages()->lookup_only(pkg_name);
3588
3589 // If the package name is not found in the loader's package
3590 // entry table, it is an indication that the package has not
3591 // been defined. Consider it defined within the unnamed module.
3592 if (_package_entry == nullptr) {
3593
3594 if (!ModuleEntryTable::javabase_defined()) {
3595 // Before java.base is defined during bootstrapping, define all packages in
3596 // the java.base module. If a non-java.base package is erroneously placed
3597 // in the java.base module it will be caught later when java.base
3598 // is defined by ModuleEntryTable::verify_javabase_packages check.
3599 assert(ModuleEntryTable::javabase_moduleEntry() != nullptr, JAVA_BASE_NAME " module is null");
3600 _package_entry = loader_data->packages()->create_entry_if_absent(pkg_name, ModuleEntryTable::javabase_moduleEntry());
3601 } else {
3602 assert(loader_data->unnamed_module() != nullptr, "unnamed module is null");
3603 _package_entry = loader_data->packages()->create_entry_if_absent(pkg_name, loader_data->unnamed_module());
3604 }
3605
3606 // A package should have been successfully created
3607 DEBUG_ONLY(ResourceMark rm(THREAD));
3608 assert(_package_entry != nullptr, "Package entry for class %s not found, loader %s",
3609 name()->as_C_string(), loader_data->loader_name_and_id());
3610 }
3611
3612 if (log_is_enabled(Debug, module)) {
3613 ResourceMark rm(THREAD);
3614 ModuleEntry* m = _package_entry->module();
3615 log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s",
3616 external_name(),
3617 pkg_name->as_C_string(),
3618 loader_data->loader_name_and_id(),
3619 (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE));
3620 }
3621 } else {
3622 ResourceMark rm(THREAD);
3623 log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s",
3624 external_name(),
3625 (loader_data != nullptr) ? loader_data->loader_name_and_id() : "null",
3626 UNNAMED_MODULE);
3627 }
3628 }
3629
3630 // Function set_classpath_index ensures that for a non-null _package_entry
3631 // of the InstanceKlass, the entry is in the boot loader's package entry table.
3632 // It then sets the classpath_index in the package entry record.
3633 //
3634 // The classpath_index field is used to find the entry on the boot loader class
3635 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
3636 // in an unnamed module. It is also used to indicate (for all packages whose
3637 // classes are loaded by the boot loader) that at least one of the package's
3638 // classes has been loaded.
3639 void InstanceKlass::set_classpath_index(s2 path_index) {
3640 if (_package_entry != nullptr) {
3641 DEBUG_ONLY(PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();)
3642 assert(pkg_entry_tbl->lookup_only(_package_entry->name()) == _package_entry, "Should be same");
3643 assert(path_index != -1, "Unexpected classpath_index");
3644 _package_entry->set_classpath_index(path_index);
3645 }
3646 }
3647
3648 // different versions of is_same_class_package
3649
3650 bool InstanceKlass::is_same_class_package(const Klass* class2) const {
3651 oop classloader1 = this->class_loader();
3652 PackageEntry* classpkg1 = this->package();
3653 if (class2->is_objArray_klass()) {
3654 class2 = ObjArrayKlass::cast(class2)->bottom_klass();
3655 }
3656
3657 oop classloader2;
3658 PackageEntry* classpkg2;
3659 if (class2->is_instance_klass()) {
3660 classloader2 = class2->class_loader();
3661 classpkg2 = class2->package();
3662 } else {
3663 assert(class2->is_typeArray_klass(), "should be type array");
3664 classloader2 = nullptr;
3665 classpkg2 = nullptr;
3666 }
3667
3668 // Same package is determined by comparing class loader
3669 // and package entries. Both must be the same. This rule
3670 // applies even to classes that are defined in the unnamed
3671 // package, they still must have the same class loader.
3672 if ((classloader1 == classloader2) && (classpkg1 == classpkg2)) {
3673 return true;
3674 }
3675
3676 return false;
3677 }
3678
3679 // return true if this class and other_class are in the same package. Classloader
3680 // and classname information is enough to determine a class's package
3681 bool InstanceKlass::is_same_class_package(oop other_class_loader,
3682 const Symbol* other_class_name) const {
3683 if (class_loader() != other_class_loader) {
3684 return false;
3685 }
3686 if (name()->fast_compare(other_class_name) == 0) {
3687 return true;
3688 }
3689
3690 {
3691 ResourceMark rm;
3692
3693 bool bad_class_name = false;
3694 TempNewSymbol other_pkg = ClassLoader::package_from_class_name(other_class_name, &bad_class_name);
3695 if (bad_class_name) {
3696 return false;
3697 }
3698 // Check that package_from_class_name() returns null, not "", if there is no package.
3699 assert(other_pkg == nullptr || other_pkg->utf8_length() > 0, "package name is empty string");
3700
3701 const Symbol* const this_package_name =
3702 this->package() != nullptr ? this->package()->name() : nullptr;
3703
3704 if (this_package_name == nullptr || other_pkg == nullptr) {
3705 // One of the two doesn't have a package. Only return true if the other
3706 // one also doesn't have a package.
3707 return this_package_name == other_pkg;
3708 }
3709
3710 // Check if package is identical
3711 return this_package_name->fast_compare(other_pkg) == 0;
3712 }
3713 }
3714
3715 static bool is_prohibited_package_slow(Symbol* class_name) {
3716 // Caller has ResourceMark
3717 int length;
3718 jchar* unicode = class_name->as_unicode(length);
3719 return (length >= 5 &&
3720 unicode[0] == 'j' &&
3721 unicode[1] == 'a' &&
3722 unicode[2] == 'v' &&
3723 unicode[3] == 'a' &&
3724 unicode[4] == '/');
3725 }
3726
3727 // Only boot and platform class loaders can define classes in "java/" packages.
3728 void InstanceKlass::check_prohibited_package(Symbol* class_name,
3729 ClassLoaderData* loader_data,
3730 TRAPS) {
3731 if (!loader_data->is_boot_class_loader_data() &&
3732 !loader_data->is_platform_class_loader_data() &&
3733 class_name != nullptr && class_name->utf8_length() >= 5) {
3734 ResourceMark rm(THREAD);
3735 bool prohibited;
3736 const u1* base = class_name->base();
3737 if ((base[0] | base[1] | base[2] | base[3] | base[4]) & 0x80) {
3738 prohibited = is_prohibited_package_slow(class_name);
3739 } else {
3740 char* name = class_name->as_C_string();
3741 prohibited = (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/');
3742 }
3743 if (prohibited) {
3744 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name);
3745 assert(pkg_name != nullptr, "Error in parsing package name starting with 'java/'");
3746 char* name = pkg_name->as_C_string();
3747 const char* class_loader_name = loader_data->loader_name_and_id();
3748 StringUtils::replace_no_expand(name, "/", ".");
3749 const char* msg_text1 = "Class loader (instance of): ";
3750 const char* msg_text2 = " tried to load prohibited package name: ";
3751 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1;
3752 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
3753 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name);
3754 THROW_MSG(vmSymbols::java_lang_SecurityException(), message);
3755 }
3756 }
3757 return;
3758 }
3759
3760 bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const {
3761 constantPoolHandle i_cp(THREAD, constants());
3762 for (InnerClassesIterator iter(this); !iter.done(); iter.next()) {
3763 int ioff = iter.inner_class_info_index();
3764 if (ioff != 0) {
3765 // Check to see if the name matches the class we're looking for
3766 // before attempting to find the class.
3767 if (i_cp->klass_name_at_matches(this, ioff)) {
3768 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false);
3769 if (this == inner_klass) {
3770 *ooff = iter.outer_class_info_index();
3771 *noff = iter.inner_name_index();
3772 return true;
3773 }
3774 }
3775 }
3776 }
3777 return false;
3778 }
3779
3780 void InstanceKlass::check_can_be_annotated_with_NullRestricted(InstanceKlass* type, Symbol* container_klass_name, TRAPS) {
3781 assert(type->is_instance_klass(), "Sanity check");
3782 if (type->is_identity_class()) {
3783 ResourceMark rm(THREAD);
3784 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
3785 err_msg("Class %s expects class %s to be a value class, but it is an identity class",
3786 container_klass_name->as_C_string(),
3787 type->external_name()));
3788 }
3789
3790 if (type->is_abstract()) {
3791 ResourceMark rm(THREAD);
3792 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
3793 err_msg("Class %s expects class %s to be concrete value type, but it is an abstract class",
3794 container_klass_name->as_C_string(),
3795 type->external_name()));
3796 }
3797 }
3798
3799 InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const {
3800 InstanceKlass* outer_klass = nullptr;
3801 *inner_is_member = false;
3802 int ooff = 0, noff = 0;
3803 bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD);
3804 if (has_inner_classes_attr) {
3805 constantPoolHandle i_cp(THREAD, constants());
3806 if (ooff != 0) {
3807 Klass* ok = i_cp->klass_at(ooff, CHECK_NULL);
3808 if (!ok->is_instance_klass()) {
3809 // If the outer class is not an instance klass then it cannot have
3810 // declared any inner classes.
3811 ResourceMark rm(THREAD);
3812 // Names are all known to be < 64k so we know this formatted message is not excessively large.
3813 Exceptions::fthrow(
3814 THREAD_AND_LOCATION,
3815 vmSymbols::java_lang_IncompatibleClassChangeError(),
3816 "%s and %s disagree on InnerClasses attribute",
3817 ok->external_name(),
3818 external_name());
3819 return nullptr;
3820 }
3821 outer_klass = InstanceKlass::cast(ok);
3822 *inner_is_member = true;
3823 }
3824 if (nullptr == outer_klass) {
3825 // It may be a local class; try for that.
3826 int encl_method_class_idx = enclosing_method_class_index();
3827 if (encl_method_class_idx != 0) {
3828 Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
3829 outer_klass = InstanceKlass::cast(ok);
3830 *inner_is_member = false;
3831 }
3832 }
3833 }
3834
3835 // If no inner class attribute found for this class.
3836 if (nullptr == outer_klass) return nullptr;
3837
3838 // Throws an exception if outer klass has not declared k as an inner klass
3839 // We need evidence that each klass knows about the other, or else
3840 // the system could allow a spoof of an inner class to gain access rights.
3841 Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL);
3842 return outer_klass;
3843 }
3844
3845 u2 InstanceKlass::compute_modifier_flags() const {
3846 u2 access = access_flags().as_unsigned_short();
3847
3848 // But check if it happens to be member class.
3849 InnerClassesIterator iter(this);
3850 for (; !iter.done(); iter.next()) {
3851 int ioff = iter.inner_class_info_index();
3852 // Inner class attribute can be zero, skip it.
3853 // Strange but true: JVM spec. allows null inner class refs.
3854 if (ioff == 0) continue;
3855
3856 // only look at classes that are already loaded
3857 // since we are looking for the flags for our self.
3858 Symbol* inner_name = constants()->klass_name_at(ioff);
3859 if (name() == inner_name) {
3860 // This is really a member class.
3861 access = iter.inner_access_flags();
3862 break;
3863 }
3864 }
3865 if (!Arguments::is_valhalla_enabled()) {
3866 // Remember to strip ACC_SUPER bit without Valhalla
3867 access &= (~JVM_ACC_SUPER);
3868 }
3869 return access;
3870 }
3871
3872 jint InstanceKlass::jvmti_class_status() const {
3873 jint result = 0;
3874
3875 if (is_linked()) {
3876 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
3877 }
3878
3879 if (is_initialized()) {
3880 assert(is_linked(), "Class status is not consistent");
3881 result |= JVMTI_CLASS_STATUS_INITIALIZED;
3882 }
3883 if (is_in_error_state()) {
3884 result |= JVMTI_CLASS_STATUS_ERROR;
3885 }
3886 return result;
3887 }
3888
3889 Method* InstanceKlass::method_at_itable(InstanceKlass* holder, int index, TRAPS) {
3890 bool implements_interface; // initialized by method_at_itable_or_null
3891 Method* m = method_at_itable_or_null(holder, index,
3892 implements_interface); // out parameter
3893 if (m != nullptr) {
3894 assert(implements_interface, "sanity");
3895 return m;
3896 } else if (implements_interface) {
3897 // Throw AbstractMethodError since corresponding itable slot is empty.
3898 THROW_NULL(vmSymbols::java_lang_AbstractMethodError());
3899 } else {
3900 // If the interface isn't implemented by the receiver class,
3901 // the VM should throw IncompatibleClassChangeError.
3902 ResourceMark rm(THREAD);
3903 stringStream ss;
3904 bool same_module = (module() == holder->module());
3905 ss.print("Receiver class %s does not implement "
3906 "the interface %s defining the method to be called "
3907 "(%s%s%s)",
3908 external_name(), holder->external_name(),
3909 (same_module) ? joint_in_module_of_loader(holder) : class_in_module_of_loader(),
3910 (same_module) ? "" : "; ",
3911 (same_module) ? "" : holder->class_in_module_of_loader());
3912 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
3913 }
3914 }
3915
3916 Method* InstanceKlass::method_at_itable_or_null(InstanceKlass* holder, int index, bool& implements_interface) {
3917 klassItable itable(this);
3918 for (int i = 0; i < itable.size_offset_table(); i++) {
3919 itableOffsetEntry* offset_entry = itable.offset_entry(i);
3920 if (offset_entry->interface_klass() == holder) {
3921 implements_interface = true;
3922 itableMethodEntry* ime = offset_entry->first_method_entry(this);
3923 Method* m = ime[index].method();
3924 return m;
3925 }
3926 }
3927 implements_interface = false;
3928 return nullptr; // offset entry not found
3929 }
3930
3931 int InstanceKlass::vtable_index_of_interface_method(Method* intf_method) {
3932 assert(is_linked(), "required");
3933 assert(intf_method->method_holder()->is_interface(), "not an interface method");
3934 assert(is_subtype_of(intf_method->method_holder()), "interface not implemented");
3935
3936 int vtable_index = Method::invalid_vtable_index;
3937 Symbol* name = intf_method->name();
3938 Symbol* signature = intf_method->signature();
3939
3940 // First check in default method array
3941 if (!intf_method->is_abstract() && default_methods() != nullptr) {
3942 int index = find_method_index(default_methods(),
3943 name, signature,
3944 Klass::OverpassLookupMode::find,
3945 Klass::StaticLookupMode::find,
3946 Klass::PrivateLookupMode::find);
3947 if (index >= 0) {
3948 vtable_index = default_vtable_indices()->at(index);
3949 }
3950 }
3951 if (vtable_index == Method::invalid_vtable_index) {
3952 // get vtable_index for miranda methods
3953 klassVtable vt = vtable();
3954 vtable_index = vt.index_of_miranda(name, signature);
3955 }
3956 return vtable_index;
3957 }
3958
3959 #if INCLUDE_JVMTI
3960 // update default_methods for redefineclasses for methods that are
3961 // not yet in the vtable due to concurrent subclass define and superinterface
3962 // redefinition
3963 // Note: those in the vtable, should have been updated via adjust_method_entries
3964 void InstanceKlass::adjust_default_methods(bool* trace_name_printed) {
3965 // search the default_methods for uses of either obsolete or EMCP methods
3966 if (default_methods() != nullptr) {
3967 for (int index = 0; index < default_methods()->length(); index ++) {
3968 Method* old_method = default_methods()->at(index);
3969 if (old_method == nullptr || !old_method->is_old()) {
3970 continue; // skip uninteresting entries
3971 }
3972 assert(!old_method->is_deleted(), "default methods may not be deleted");
3973 Method* new_method = old_method->get_new_method();
3974 default_methods()->at_put(index, new_method);
3975
3976 if (log_is_enabled(Info, redefine, class, update)) {
3977 ResourceMark rm;
3978 if (!(*trace_name_printed)) {
3979 log_info(redefine, class, update)
3980 ("adjust: klassname=%s default methods from name=%s",
3981 external_name(), old_method->method_holder()->external_name());
3982 *trace_name_printed = true;
3983 }
3984 log_debug(redefine, class, update, vtables)
3985 ("default method update: %s(%s) ",
3986 new_method->name()->as_C_string(), new_method->signature()->as_C_string());
3987 }
3988 }
3989 }
3990 }
3991 #endif // INCLUDE_JVMTI
3992
3993 // On-stack replacement stuff
3994 void InstanceKlass::add_osr_nmethod(nmethod* n) {
3995 assert_lock_strong(NMethodState_lock);
3996 #ifndef PRODUCT
3997 nmethod* prev = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), n->comp_level(), true);
3998 assert(prev == nullptr || !prev->is_in_use() COMPILER2_PRESENT(|| StressRecompilation),
3999 "redundant OSR recompilation detected. memory leak in CodeCache!");
4000 #endif
4001 // only one compilation can be active
4002 assert(n->is_osr_method(), "wrong kind of nmethod");
4003 n->set_osr_link(osr_nmethods_head());
4004 set_osr_nmethods_head(n);
4005 // Raise the highest osr level if necessary
4006 n->method()->set_highest_osr_comp_level(MAX2(n->method()->highest_osr_comp_level(), n->comp_level()));
4007
4008 // Get rid of the osr methods for the same bci that have lower levels.
4009 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) {
4010 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true);
4011 if (inv != nullptr && inv->is_in_use()) {
4012 inv->make_not_entrant(nmethod::InvalidationReason::OSR_INVALIDATION_OF_LOWER_LEVEL);
4013 }
4014 }
4015 }
4016
4017 // Remove osr nmethod from the list. Return true if found and removed.
4018 bool InstanceKlass::remove_osr_nmethod(nmethod* n) {
4019 // This is a short non-blocking critical region, so the no safepoint check is ok.
4020 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
4021 assert(n->is_osr_method(), "wrong kind of nmethod");
4022 nmethod* last = nullptr;
4023 nmethod* cur = osr_nmethods_head();
4024 int max_level = CompLevel_none; // Find the max comp level excluding n
4025 Method* m = n->method();
4026 // Search for match
4027 bool found = false;
4028 while(cur != nullptr && cur != n) {
4029 if (m == cur->method()) {
4030 // Find max level before n
4031 max_level = MAX2(max_level, cur->comp_level());
4032 }
4033 last = cur;
4034 cur = cur->osr_link();
4035 }
4036 nmethod* next = nullptr;
4037 if (cur == n) {
4038 found = true;
4039 next = cur->osr_link();
4040 if (last == nullptr) {
4041 // Remove first element
4042 set_osr_nmethods_head(next);
4043 } else {
4044 last->set_osr_link(next);
4045 }
4046 }
4047 n->set_osr_link(nullptr);
4048 cur = next;
4049 while (cur != nullptr) {
4050 // Find max level after n
4051 if (m == cur->method()) {
4052 max_level = MAX2(max_level, cur->comp_level());
4053 }
4054 cur = cur->osr_link();
4055 }
4056 m->set_highest_osr_comp_level(max_level);
4057 return found;
4058 }
4059
4060 int InstanceKlass::mark_osr_nmethods(DeoptimizationScope* deopt_scope, const Method* m) {
4061 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
4062 nmethod* osr = osr_nmethods_head();
4063 int found = 0;
4064 while (osr != nullptr) {
4065 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
4066 if (osr->method() == m) {
4067 deopt_scope->mark(osr);
4068 found++;
4069 }
4070 osr = osr->osr_link();
4071 }
4072 return found;
4073 }
4074
4075 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
4076 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
4077 nmethod* osr = osr_nmethods_head();
4078 nmethod* best = nullptr;
4079 while (osr != nullptr) {
4080 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
4081 // There can be a time when a c1 osr method exists but we are waiting
4082 // for a c2 version. When c2 completes its osr nmethod we will trash
4083 // the c1 version and only be able to find the c2 version. However
4084 // while we overflow in the c1 code at back branches we don't want to
4085 // try and switch to the same code as we are already running
4086
4087 if (osr->method() == m &&
4088 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
4089 if (match_level) {
4090 if (osr->comp_level() == comp_level) {
4091 // Found a match - return it.
4092 return osr;
4093 }
4094 } else {
4095 if (best == nullptr || (osr->comp_level() > best->comp_level())) {
4096 if (osr->comp_level() == CompilationPolicy::highest_compile_level()) {
4097 // Found the best possible - return it.
4098 return osr;
4099 }
4100 best = osr;
4101 }
4102 }
4103 }
4104 osr = osr->osr_link();
4105 }
4106
4107 assert(match_level == false || best == nullptr, "shouldn't pick up anything if match_level is set");
4108 if (best != nullptr && best->comp_level() >= comp_level) {
4109 return best;
4110 }
4111 return nullptr;
4112 }
4113
4114 // -----------------------------------------------------------------------------------------------------
4115 // Printing
4116
4117 #define BULLET " - "
4118
4119 static const char* state_names[] = {
4120 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
4121 };
4122
4123 static void print_vtable(intptr_t* start, int len, outputStream* st) {
4124 for (int i = 0; i < len; i++) {
4125 intptr_t e = start[i];
4126 st->print("%d : " INTPTR_FORMAT, i, e);
4127 if (MetaspaceObj::is_valid((Metadata*)e)) {
4128 st->print(" ");
4129 ((Metadata*)e)->print_value_on(st);
4130 }
4131 st->cr();
4132 }
4133 }
4134
4135 static void print_vtable(vtableEntry* start, int len, outputStream* st) {
4136 return print_vtable(reinterpret_cast<intptr_t*>(start), len, st);
4137 }
4138
4139 const char* InstanceKlass::init_state_name() const {
4140 return state_names[init_state()];
4141 }
4142
4143 void InstanceKlass::print_class_flags(outputStream* st) const {
4144 AccessFlags flags(compute_modifier_flags());
4145 if (flags.is_public ()) st->print("public ");
4146 if (flags.is_private ()) st->print("private ");
4147 if (flags.is_protected ()) st->print("protected ");
4148 if (flags.is_static ()) st->print("static ");
4149 if (flags.is_final ()) st->print("final ");
4150 if (flags.is_interface ()) st->print("interface ");
4151 if (flags.is_abstract ()) st->print("abstract ");
4152 if (flags.is_annotation()) st->print("annotation ");
4153 if (flags.is_enum ()) st->print("enum ");
4154 if (flags.is_synthetic ()) st->print("synthetic ");
4155 if (Arguments::is_valhalla_enabled()) {
4156 if (flags.is_identity_class()) st->print("identity ");
4157 if (!flags.is_identity_class()) st->print("value " );
4158 }
4159 }
4160
4161 void InstanceKlass::print_on(outputStream* st) const {
4162 assert(is_klass(), "must be klass");
4163 Klass::print_on(st);
4164
4165 st->print(BULLET"instance size: %d", size_helper()); st->cr();
4166 st->print(BULLET"klass size: %d", size()); st->cr();
4167 st->print(BULLET"access: "); print_class_flags(st); st->cr();
4168 st->print(BULLET"flags: "); _misc_flags.print_on(st); st->cr();
4169 st->print(BULLET"state: "); st->print_cr("%s", init_state_name());
4170 st->print(BULLET"name: "); name()->print_value_on(st); st->cr();
4171 st->print(BULLET"super: "); Metadata::print_value_on_maybe_null(st, super()); st->cr();
4172 st->print(BULLET"sub: ");
4173 Klass* sub = subklass();
4174 int n;
4175 for (n = 0; sub != nullptr; n++, sub = sub->next_sibling()) {
4176 if (n < MaxSubklassPrintSize) {
4177 sub->print_value_on(st);
4178 st->print(" ");
4179 }
4180 }
4181 if (n >= MaxSubklassPrintSize) st->print("(%zd more klasses...)", n - MaxSubklassPrintSize);
4182 st->cr();
4183
4184 if (is_interface()) {
4185 st->print_cr(BULLET"nof implementors: %d", nof_implementors());
4186 if (nof_implementors() == 1) {
4187 st->print_cr(BULLET"implementor: ");
4188 st->print(" ");
4189 implementor()->print_value_on(st);
4190 st->cr();
4191 }
4192 }
4193
4194 st->print(BULLET"arrays: "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr();
4195 st->print(BULLET"methods: ");
4196 print_array_on(st, methods(), [](outputStream* ost, Method* method) {
4197 method->print_value_on(ost);
4198 });
4199 st->print(BULLET"method ordering: ");
4200 print_array_on(st, method_ordering(), [](outputStream* ost, int i) {
4201 ost->print("%d", i);
4202 });
4203 if (default_methods() != nullptr) {
4204 st->print(BULLET"default_methods: ");
4205 print_array_on(st, default_methods(), [](outputStream* ost, Method* method) {
4206 method->print_value_on(ost);
4207 });
4208 }
4209 print_on_maybe_null(st, BULLET"default vtable indices: ", default_vtable_indices());
4210 st->print(BULLET"local interfaces: "); local_interfaces()->print_value_on(st); st->cr();
4211 st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr();
4212
4213 st->print(BULLET"secondary supers: "); secondary_supers()->print_value_on(st); st->cr();
4214
4215 st->print(BULLET"hash_slot: %d", hash_slot()); st->cr();
4216 st->print(BULLET"secondary bitmap: " UINTX_FORMAT_X_0, _secondary_supers_bitmap); st->cr();
4217
4218 if (secondary_supers() != nullptr) {
4219 if (Verbose) {
4220 bool is_hashed = (_secondary_supers_bitmap != SECONDARY_SUPERS_BITMAP_FULL);
4221 st->print_cr(BULLET"---- secondary supers (%d words):", _secondary_supers->length());
4222 for (int i = 0; i < _secondary_supers->length(); i++) {
4223 ResourceMark rm; // for external_name()
4224 Klass* secondary_super = _secondary_supers->at(i);
4225 st->print(BULLET"%2d:", i);
4226 if (is_hashed) {
4227 int home_slot = compute_home_slot(secondary_super, _secondary_supers_bitmap);
4228 int distance = (i - home_slot) & SECONDARY_SUPERS_TABLE_MASK;
4229 st->print(" dist:%02d:", distance);
4230 }
4231 st->print_cr(" %p %s", secondary_super, secondary_super->external_name());
4232 }
4233 }
4234 }
4235 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr();
4236
4237 print_on_maybe_null(st, BULLET"class loader data: ", class_loader_data());
4238 print_on_maybe_null(st, BULLET"source file: ", source_file_name());
4239 if (source_debug_extension() != nullptr) {
4240 st->print(BULLET"source debug extension: ");
4241 st->print("%s", source_debug_extension());
4242 st->cr();
4243 }
4244 print_on_maybe_null(st, BULLET"class annotations: ", class_annotations());
4245 print_on_maybe_null(st, BULLET"class type annotations: ", class_type_annotations());
4246 print_on_maybe_null(st, BULLET"field annotations: ", fields_annotations());
4247 print_on_maybe_null(st, BULLET"field type annotations: ", fields_type_annotations());
4248 {
4249 bool have_pv = false;
4250 // previous versions are linked together through the InstanceKlass
4251 for (InstanceKlass* pv_node = previous_versions();
4252 pv_node != nullptr;
4253 pv_node = pv_node->previous_versions()) {
4254 if (!have_pv)
4255 st->print(BULLET"previous version: ");
4256 have_pv = true;
4257 pv_node->constants()->print_value_on(st);
4258 }
4259 if (have_pv) st->cr();
4260 }
4261
4262 print_on_maybe_null(st, BULLET"generic signature: ", generic_signature());
4263 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr();
4264 st->print(BULLET"nest members: "); nest_members()->print_value_on(st); st->cr();
4265 print_on_maybe_null(st, BULLET"record components: ", record_components());
4266 st->print(BULLET"permitted subclasses: "); permitted_subclasses()->print_value_on(st); st->cr();
4267 st->print(BULLET"loadable descriptors: "); loadable_descriptors()->print_value_on(st); st->cr();
4268 if (java_mirror() != nullptr) {
4269 st->print(BULLET"java mirror: ");
4270 java_mirror()->print_value_on(st);
4271 st->cr();
4272 } else {
4273 st->print_cr(BULLET"java mirror: null");
4274 }
4275 st->print(BULLET"vtable length %d (start addr: " PTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
4276 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st);
4277 st->print(BULLET"itable length %d (start addr: " PTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
4278 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_itable(), itable_length(), st);
4279
4280 InstanceKlass* ik = const_cast<InstanceKlass*>(this);
4281 // There is no oop so static and nonstatic printing can use the same printer.
4282 FieldPrinter field_printer(st);
4283 st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
4284 ik->do_local_static_fields(&field_printer);
4285 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
4286 ik->print_nonstatic_fields(&field_printer);
4287
4288 st->print(BULLET"non-static oop maps (%d entries): ", nonstatic_oop_map_count());
4289 OopMapBlock* map = start_of_nonstatic_oop_maps();
4290 OopMapBlock* end_map = map + nonstatic_oop_map_count();
4291 while (map < end_map) {
4292 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
4293 map++;
4294 }
4295 st->cr();
4296
4297 if (fieldinfo_search_table() != nullptr) {
4298 st->print_cr(BULLET"---- field info search table:");
4299 FieldInfoStream::print_search_table(st, _constants, _fieldinfo_stream, _fieldinfo_search_table);
4300 }
4301 }
4302
4303 void InstanceKlass::print_value_on(outputStream* st) const {
4304 assert(is_klass(), "must be klass");
4305 if (Verbose || WizardMode) print_class_flags(st);
4306 name()->print_value_on(st);
4307 }
4308
4309 void FieldPrinter::do_field(fieldDescriptor* fd) {
4310 for (int i = 0; i < _indent; i++) _st->print(" ");
4311 _st->print(BULLET);
4312 // Handles the cases of static fields or instance fields but no oop is given.
4313 if (_obj == nullptr) {
4314 fd->print_on(_st, _base_offset);
4315 _st->cr();
4316 } else {
4317 fd->print_on_for(_st, _obj, _indent, _base_offset);
4318 if (!fd->field_flags().is_flat()) _st->cr();
4319 }
4320 }
4321
4322
4323 void InstanceKlass::oop_print_on(oop obj, outputStream* st, int indent, int base_offset) {
4324 Klass::oop_print_on(obj, st);
4325
4326 if (this == vmClasses::String_klass()) {
4327 typeArrayOop value = java_lang_String::value(obj);
4328 juint length = java_lang_String::length(obj);
4329 if (value != nullptr &&
4330 value->is_typeArray() &&
4331 length <= (juint) value->length()) {
4332 st->print(BULLET"string: ");
4333 java_lang_String::print(obj, st);
4334 st->cr();
4335 }
4336 }
4337
4338 st->print_cr(BULLET"---- fields (total size %zu words):", oop_size(obj));
4339 FieldPrinter print_field(st, obj, indent, base_offset);
4340 print_nonstatic_fields(&print_field);
4341
4342 if (this == vmClasses::Class_klass()) {
4343 st->print(BULLET"signature: ");
4344 java_lang_Class::print_signature(obj, st);
4345 st->cr();
4346 Klass* real_klass = java_lang_Class::as_Klass(obj);
4347 if (real_klass != nullptr && real_klass->is_instance_klass()) {
4348 st->print_cr(BULLET"---- static fields (%d):", java_lang_Class::static_oop_field_count(obj));
4349 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
4350 }
4351 } else if (this == vmClasses::MethodType_klass()) {
4352 st->print(BULLET"signature: ");
4353 java_lang_invoke_MethodType::print_signature(obj, st);
4354 st->cr();
4355 }
4356 }
4357
4358 #ifndef PRODUCT
4359
4360 bool InstanceKlass::verify_itable_index(int i) {
4361 int method_count = klassItable::method_count_for_interface(this);
4362 assert(i >= 0 && i < method_count, "index out of bounds");
4363 return true;
4364 }
4365
4366 #endif //PRODUCT
4367
4368 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
4369 st->print("a ");
4370 name()->print_value_on(st);
4371 obj->print_address_on(st);
4372 if (this == vmClasses::String_klass()
4373 && java_lang_String::value(obj) != nullptr) {
4374 ResourceMark rm;
4375 int len = java_lang_String::length(obj);
4376 int plen = (len < 24 ? len : 12);
4377 char* str = java_lang_String::as_utf8_string(obj, 0, plen);
4378 st->print(" = \"%s\"", str);
4379 if (len > plen)
4380 st->print("...[%d]", len);
4381 } else if (this == vmClasses::Class_klass()) {
4382 Klass* k = java_lang_Class::as_Klass(obj);
4383 st->print(" = ");
4384 if (k != nullptr) {
4385 k->print_value_on(st);
4386 } else {
4387 const char* tname = type2name(java_lang_Class::primitive_type(obj));
4388 st->print("%s", tname ? tname : "type?");
4389 }
4390 } else if (this == vmClasses::MethodType_klass()) {
4391 st->print(" = ");
4392 java_lang_invoke_MethodType::print_signature(obj, st);
4393 } else if (java_lang_boxing_object::is_instance(obj)) {
4394 st->print(" = ");
4395 java_lang_boxing_object::print(obj, st);
4396 } else if (this == vmClasses::LambdaForm_klass()) {
4397 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
4398 if (vmentry != nullptr) {
4399 st->print(" => ");
4400 vmentry->print_value_on(st);
4401 }
4402 } else if (this == vmClasses::MemberName_klass()) {
4403 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
4404 if (vmtarget != nullptr) {
4405 st->print(" = ");
4406 vmtarget->print_value_on(st);
4407 } else {
4408 oop clazz = java_lang_invoke_MemberName::clazz(obj);
4409 oop name = java_lang_invoke_MemberName::name(obj);
4410 if (clazz != nullptr) {
4411 clazz->print_value_on(st);
4412 } else {
4413 st->print("null");
4414 }
4415 st->print(".");
4416 if (name != nullptr) {
4417 name->print_value_on(st);
4418 } else {
4419 st->print("null");
4420 }
4421 }
4422 }
4423 }
4424
4425 const char* InstanceKlass::internal_name() const {
4426 return external_name();
4427 }
4428
4429 void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data,
4430 const ModuleEntry* module_entry,
4431 const ClassFileStream* cfs) const {
4432
4433 if (ClassListWriter::is_enabled()) {
4434 ClassListWriter::write(this, cfs);
4435 }
4436
4437 print_class_load_helper(loader_data, module_entry, cfs);
4438 print_class_load_cause_logging();
4439 }
4440
4441 void InstanceKlass::print_class_load_helper(ClassLoaderData* loader_data,
4442 const ModuleEntry* module_entry,
4443 const ClassFileStream* cfs) const {
4444
4445 if (!log_is_enabled(Info, class, load)) {
4446 return;
4447 }
4448
4449 ResourceMark rm;
4450 LogMessage(class, load) msg;
4451 stringStream info_stream;
4452
4453 // Name and class hierarchy info
4454 info_stream.print("%s", external_name());
4455
4456 // Source
4457 if (cfs != nullptr) {
4458 if (cfs->source() != nullptr) {
4459 const char* module_name = (module_entry->name() == nullptr) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
4460 if (module_name != nullptr) {
4461 // When the boot loader created the stream, it didn't know the module name
4462 // yet. Let's format it now.
4463 if (cfs->from_boot_loader_modules_image()) {
4464 info_stream.print(" source: jrt:/%s", module_name);
4465 } else {
4466 info_stream.print(" source: %s", cfs->source());
4467 }
4468 } else {
4469 info_stream.print(" source: %s", cfs->source());
4470 }
4471 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) {
4472 Thread* current = Thread::current();
4473 Klass* caller = current->is_Java_thread() ?
4474 JavaThread::cast(current)->security_get_caller_class(1):
4475 nullptr;
4476 // caller can be null, for example, during a JVMTI VM_Init hook
4477 if (caller != nullptr) {
4478 info_stream.print(" source: instance of %s", caller->external_name());
4479 } else {
4480 // source is unknown
4481 }
4482 } else {
4483 oop class_loader = loader_data->class_loader();
4484 info_stream.print(" source: %s", class_loader->klass()->external_name());
4485 }
4486 } else {
4487 assert(this->in_aot_cache(), "must be");
4488 if (AOTMetaspace::in_aot_cache_dynamic_region((void*)this)) {
4489 info_stream.print(" source: shared objects file (top)");
4490 } else {
4491 info_stream.print(" source: shared objects file");
4492 }
4493 }
4494
4495 msg.info("%s", info_stream.as_string());
4496
4497 if (log_is_enabled(Debug, class, load)) {
4498 stringStream debug_stream;
4499
4500 // Class hierarchy info
4501 debug_stream.print(" klass: " PTR_FORMAT " super: " PTR_FORMAT,
4502 p2i(this), p2i(super()));
4503
4504 // Interfaces
4505 if (local_interfaces() != nullptr && local_interfaces()->length() > 0) {
4506 debug_stream.print(" interfaces:");
4507 int length = local_interfaces()->length();
4508 for (int i = 0; i < length; i++) {
4509 debug_stream.print(" " PTR_FORMAT,
4510 p2i(local_interfaces()->at(i)));
4511 }
4512 }
4513
4514 // Class loader
4515 debug_stream.print(" loader: [");
4516 loader_data->print_value_on(&debug_stream);
4517 debug_stream.print("]");
4518
4519 // Classfile checksum
4520 if (cfs) {
4521 debug_stream.print(" bytes: %d checksum: %08x",
4522 cfs->length(),
4523 ClassLoader::crc32(0, (const char*)cfs->buffer(),
4524 cfs->length()));
4525 }
4526
4527 msg.debug("%s", debug_stream.as_string());
4528 }
4529 }
4530
4531 void InstanceKlass::print_class_load_cause_logging() const {
4532 bool log_cause_native = log_is_enabled(Info, class, load, cause, native);
4533 if (log_cause_native || log_is_enabled(Info, class, load, cause)) {
4534 JavaThread* current = JavaThread::current();
4535 ResourceMark rm(current);
4536 const char* name = external_name();
4537
4538 if (LogClassLoadingCauseFor == nullptr ||
4539 (strcmp("*", LogClassLoadingCauseFor) != 0 &&
4540 strstr(name, LogClassLoadingCauseFor) == nullptr)) {
4541 return;
4542 }
4543
4544 // Log Java stack first
4545 {
4546 LogMessage(class, load, cause) msg;
4547 NonInterleavingLogStream info_stream{LogLevelType::Info, msg};
4548
4549 info_stream.print_cr("Java stack when loading %s:", name);
4550 current->print_stack_on(&info_stream);
4551 }
4552
4553 // Log native stack second
4554 if (log_cause_native) {
4555 // Log to string first so that lines can be indented
4556 stringStream stack_stream;
4557 char buf[O_BUFLEN];
4558 address lastpc = nullptr;
4559 NativeStackPrinter nsp(current);
4560 nsp.print_stack(&stack_stream, buf, sizeof(buf), lastpc,
4561 true /* print_source_info */, -1 /* max stack */);
4562
4563 LogMessage(class, load, cause, native) msg;
4564 NonInterleavingLogStream info_stream{LogLevelType::Info, msg};
4565 info_stream.print_cr("Native stack when loading %s:", name);
4566
4567 // Print each native stack line to the log
4568 int size = (int) stack_stream.size();
4569 char* stack = stack_stream.as_string();
4570 char* stack_end = stack + size;
4571 char* line_start = stack;
4572 for (char* p = stack; p < stack_end; p++) {
4573 if (*p == '\n') {
4574 *p = '\0';
4575 info_stream.print_cr("\t%s", line_start);
4576 line_start = p + 1;
4577 }
4578 }
4579 if (line_start < stack_end) {
4580 info_stream.print_cr("\t%s", line_start);
4581 }
4582 }
4583 }
4584 }
4585
4586 // Verification
4587
4588 class VerifyFieldClosure: public BasicOopIterateClosure {
4589 protected:
4590 template <class T> void do_oop_work(T* p) {
4591 oop obj = RawAccess<>::oop_load(p);
4592 if (!oopDesc::is_oop_or_null(obj)) {
4593 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj));
4594 Universe::print_on(tty);
4595 guarantee(false, "boom");
4596 }
4597 }
4598 public:
4599 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); }
4600 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
4601 };
4602
4603 void InstanceKlass::verify_on(outputStream* st) {
4604 #ifndef PRODUCT
4605 // Avoid redundant verifies, this really should be in product.
4606 if (_verify_count == Universe::verify_count()) return;
4607 _verify_count = Universe::verify_count();
4608 #endif
4609
4610 // Verify Klass
4611 Klass::verify_on(st);
4612
4613 // Verify that klass is present in ClassLoaderData
4614 guarantee(class_loader_data()->contains_klass(this),
4615 "this class isn't found in class loader data");
4616
4617 // Verify vtables
4618 if (is_linked()) {
4619 // $$$ This used to be done only for m/s collections. Doing it
4620 // always seemed a valid generalization. (DLD -- 6/00)
4621 vtable().verify(st);
4622 }
4623
4624 // Verify first subklass
4625 if (subklass() != nullptr) {
4626 guarantee(subklass()->is_klass(), "should be klass");
4627 }
4628
4629 // Verify siblings
4630 Klass* super = this->super();
4631 Klass* sib = next_sibling();
4632 if (sib != nullptr) {
4633 if (sib == this) {
4634 fatal("subclass points to itself " PTR_FORMAT, p2i(sib));
4635 }
4636
4637 guarantee(sib->is_klass(), "should be klass");
4638 guarantee(sib->super() == super, "siblings should have same superklass");
4639 }
4640
4641 // Verify local interfaces
4642 if (local_interfaces()) {
4643 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
4644 for (int j = 0; j < local_interfaces->length(); j++) {
4645 InstanceKlass* e = local_interfaces->at(j);
4646 guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
4647 }
4648 }
4649
4650 // Verify transitive interfaces
4651 if (transitive_interfaces() != nullptr) {
4652 Array<InstanceKlass*>* transitive_interfaces = this->transitive_interfaces();
4653 for (int j = 0; j < transitive_interfaces->length(); j++) {
4654 InstanceKlass* e = transitive_interfaces->at(j);
4655 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
4656 }
4657 }
4658
4659 // Verify methods
4660 if (methods() != nullptr) {
4661 Array<Method*>* methods = this->methods();
4662 for (int j = 0; j < methods->length(); j++) {
4663 guarantee(methods->at(j)->is_method(), "non-method in methods array");
4664 }
4665 for (int j = 0; j < methods->length() - 1; j++) {
4666 Method* m1 = methods->at(j);
4667 Method* m2 = methods->at(j + 1);
4668 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
4669 }
4670 }
4671
4672 // Verify method ordering
4673 if (method_ordering() != nullptr) {
4674 Array<int>* method_ordering = this->method_ordering();
4675 int length = method_ordering->length();
4676 if (JvmtiExport::can_maintain_original_method_order() ||
4677 ((CDSConfig::is_using_archive() || CDSConfig::is_dumping_archive()) && length != 0)) {
4678 guarantee(length == methods()->length(), "invalid method ordering length");
4679 jlong sum = 0;
4680 for (int j = 0; j < length; j++) {
4681 int original_index = method_ordering->at(j);
4682 guarantee(original_index >= 0, "invalid method ordering index");
4683 guarantee(original_index < length, "invalid method ordering index");
4684 sum += original_index;
4685 }
4686 // Verify sum of indices 0,1,...,length-1
4687 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
4688 } else {
4689 guarantee(length == 0, "invalid method ordering length");
4690 }
4691 }
4692
4693 // Verify default methods
4694 if (default_methods() != nullptr) {
4695 Array<Method*>* methods = this->default_methods();
4696 for (int j = 0; j < methods->length(); j++) {
4697 guarantee(methods->at(j)->is_method(), "non-method in methods array");
4698 }
4699 for (int j = 0; j < methods->length() - 1; j++) {
4700 Method* m1 = methods->at(j);
4701 Method* m2 = methods->at(j + 1);
4702 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
4703 }
4704 }
4705
4706 // Verify JNI static field identifiers
4707 if (jni_ids() != nullptr) {
4708 jni_ids()->verify(this);
4709 }
4710
4711 // Verify other fields
4712 if (constants() != nullptr) {
4713 guarantee(constants()->is_constantPool(), "should be constant pool");
4714 }
4715 }
4716
4717 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
4718 Klass::oop_verify_on(obj, st);
4719 VerifyFieldClosure blk;
4720 obj->oop_iterate(&blk);
4721 }
4722
4723 // JNIid class for jfieldIDs only
4724 // Note to reviewers:
4725 // These JNI functions are just moved over to column 1 and not changed
4726 // in the compressed oops workspace.
4727 JNIid::JNIid(InstanceKlass* holder, int offset, JNIid* next) {
4728 _holder = holder;
4729 _offset = offset;
4730 _next = next;
4731 DEBUG_ONLY(_is_static_field_id = false;)
4732 }
4733
4734 JNIid* JNIid::find(int offset) {
4735 JNIid* current = this;
4736 while (current != nullptr) {
4737 if (current->offset() == offset) return current;
4738 current = current->next();
4739 }
4740 return nullptr;
4741 }
4742
4743 void JNIid::deallocate(JNIid* current) {
4744 while (current != nullptr) {
4745 JNIid* next = current->next();
4746 delete current;
4747 current = next;
4748 }
4749 }
4750
4751 void JNIid::verify(InstanceKlass* holder) {
4752 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields();
4753 int end_field_offset;
4754 end_field_offset = first_field_offset + (holder->static_field_size() * wordSize);
4755
4756 JNIid* current = this;
4757 while (current != nullptr) {
4758 guarantee(current->holder() == holder, "Invalid klass in JNIid");
4759 #ifdef ASSERT
4760 int o = current->offset();
4761 if (current->is_static_field_id()) {
4762 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid");
4763 }
4764 #endif
4765 current = current->next();
4766 }
4767 }
4768
4769 void InstanceKlass::set_init_state(ClassState state) {
4770 #ifdef ASSERT
4771 bool good_state = in_aot_cache() ? (_init_state <= state)
4772 : (_init_state < state);
4773 assert(good_state || state == allocated, "illegal state transition");
4774 #endif
4775 assert(_init_thread == nullptr, "should be cleared before state change");
4776 AtomicAccess::release_store(&_init_state, state);
4777 }
4778
4779 #if INCLUDE_JVMTI
4780
4781 // RedefineClasses() support for previous versions
4782
4783 // Globally, there is at least one previous version of a class to walk
4784 // during class unloading, which is saved because old methods in the class
4785 // are still running. Otherwise the previous version list is cleaned up.
4786 bool InstanceKlass::_should_clean_previous_versions = false;
4787
4788 // Returns true if there are previous versions of a class for class
4789 // unloading only. Also resets the flag to false. purge_previous_version
4790 // will set the flag to true if there are any left, i.e., if there's any
4791 // work to do for next time. This is to avoid the expensive code cache
4792 // walk in CLDG::clean_deallocate_lists().
4793 bool InstanceKlass::should_clean_previous_versions_and_reset() {
4794 bool ret = _should_clean_previous_versions;
4795 log_trace(redefine, class, iklass, purge)("Class unloading: should_clean_previous_versions = %s",
4796 ret ? "true" : "false");
4797 _should_clean_previous_versions = false;
4798 return ret;
4799 }
4800
4801 // This nulls out the jmethodID for all obsolete methods in the previous version of the 'klass'.
4802 // These obsolete methods only exist in the previous version and we're about to delete the memory for them.
4803 // The jmethodID for these are deallocated when we unload the class, so this doesn't remove them from the table.
4804 void InstanceKlass::clear_obsolete_jmethod_ids(InstanceKlass* klass) {
4805 Array<Method*>* method_refs = klass->methods();
4806 for (int k = 0; k < method_refs->length(); k++) {
4807 Method* method = method_refs->at(k);
4808 // Only need to clear obsolete methods.
4809 if (method != nullptr && method->is_obsolete()) {
4810 method->clear_jmethod_id();
4811 }
4812 }
4813 }
4814
4815 // Purge previous versions before adding new previous versions of the class and
4816 // during class unloading.
4817 void InstanceKlass::purge_previous_version_list() {
4818 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
4819 assert(has_been_redefined(), "Should only be called for main class");
4820
4821 // Quick exit.
4822 if (previous_versions() == nullptr) {
4823 return;
4824 }
4825
4826 // This klass has previous versions so see what we can cleanup
4827 // while it is safe to do so.
4828
4829 int deleted_count = 0; // leave debugging breadcrumbs
4830 int live_count = 0;
4831 ClassLoaderData* loader_data = class_loader_data();
4832 assert(loader_data != nullptr, "should never be null");
4833
4834 ResourceMark rm;
4835 log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name());
4836
4837 // previous versions are linked together through the InstanceKlass
4838 InstanceKlass* pv_node = previous_versions();
4839 InstanceKlass* last = this;
4840 int version = 0;
4841
4842 // check the previous versions list
4843 for (; pv_node != nullptr; ) {
4844
4845 ConstantPool* pvcp = pv_node->constants();
4846 assert(pvcp != nullptr, "cp ref was unexpectedly cleared");
4847
4848 if (!pvcp->on_stack()) {
4849 // If the constant pool isn't on stack, none of the methods
4850 // are executing. Unlink this previous_version.
4851 // The previous version InstanceKlass is on the ClassLoaderData deallocate list
4852 // so will be deallocated during the next phase of class unloading.
4853 log_trace(redefine, class, iklass, purge)
4854 ("previous version " PTR_FORMAT " is dead.", p2i(pv_node));
4855 // Unlink from previous version list.
4856 assert(pv_node->class_loader_data() == loader_data, "wrong loader_data");
4857 InstanceKlass* next = pv_node->previous_versions();
4858 clear_obsolete_jmethod_ids(pv_node); // jmethodID maintenance for the unloaded class
4859 pv_node->link_previous_versions(nullptr); // point next to null
4860 last->link_previous_versions(next);
4861 // Delete this node directly. Nothing is referring to it and we don't
4862 // want it to increase the counter for metadata to delete in CLDG.
4863 MetadataFactory::free_metadata(loader_data, pv_node);
4864 pv_node = next;
4865 deleted_count++;
4866 version++;
4867 continue;
4868 } else {
4869 assert(pvcp->pool_holder() != nullptr, "Constant pool with no holder");
4870 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
4871 live_count++;
4872 if (pvcp->in_aot_cache()) {
4873 // Shared previous versions can never be removed so no cleaning is needed.
4874 log_trace(redefine, class, iklass, purge)("previous version " PTR_FORMAT " is shared", p2i(pv_node));
4875 } else {
4876 // Previous version alive, set that clean is needed for next time.
4877 _should_clean_previous_versions = true;
4878 log_trace(redefine, class, iklass, purge)("previous version " PTR_FORMAT " is alive", p2i(pv_node));
4879 }
4880 }
4881
4882 // next previous version
4883 last = pv_node;
4884 pv_node = pv_node->previous_versions();
4885 version++;
4886 }
4887 log_trace(redefine, class, iklass, purge)
4888 ("previous version stats: live=%d, deleted=%d", live_count, deleted_count);
4889 }
4890
4891 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods,
4892 int emcp_method_count) {
4893 int obsolete_method_count = old_methods->length() - emcp_method_count;
4894
4895 if (emcp_method_count != 0 && obsolete_method_count != 0 &&
4896 _previous_versions != nullptr) {
4897 // We have a mix of obsolete and EMCP methods so we have to
4898 // clear out any matching EMCP method entries the hard way.
4899 int local_count = 0;
4900 for (int i = 0; i < old_methods->length(); i++) {
4901 Method* old_method = old_methods->at(i);
4902 if (old_method->is_obsolete()) {
4903 // only obsolete methods are interesting
4904 Symbol* m_name = old_method->name();
4905 Symbol* m_signature = old_method->signature();
4906
4907 // previous versions are linked together through the InstanceKlass
4908 int j = 0;
4909 for (InstanceKlass* prev_version = _previous_versions;
4910 prev_version != nullptr;
4911 prev_version = prev_version->previous_versions(), j++) {
4912
4913 Array<Method*>* method_refs = prev_version->methods();
4914 for (int k = 0; k < method_refs->length(); k++) {
4915 Method* method = method_refs->at(k);
4916
4917 if (!method->is_obsolete() &&
4918 method->name() == m_name &&
4919 method->signature() == m_signature) {
4920 // The current RedefineClasses() call has made all EMCP
4921 // versions of this method obsolete so mark it as obsolete
4922 log_trace(redefine, class, iklass, add)
4923 ("%s(%s): flush obsolete method @%d in version @%d",
4924 m_name->as_C_string(), m_signature->as_C_string(), k, j);
4925
4926 method->set_is_obsolete();
4927 break;
4928 }
4929 }
4930
4931 // The previous loop may not find a matching EMCP method, but
4932 // that doesn't mean that we can optimize and not go any
4933 // further back in the PreviousVersion generations. The EMCP
4934 // method for this generation could have already been made obsolete,
4935 // but there still may be an older EMCP method that has not
4936 // been made obsolete.
4937 }
4938
4939 if (++local_count >= obsolete_method_count) {
4940 // no more obsolete methods so bail out now
4941 break;
4942 }
4943 }
4944 }
4945 }
4946 }
4947
4948 // Save the scratch_class as the previous version if any of the methods are running.
4949 // The previous_versions are used to set breakpoints in EMCP methods and they are
4950 // also used to clean MethodData links to redefined methods that are no longer running.
4951 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class,
4952 int emcp_method_count) {
4953 assert(Thread::current()->is_VM_thread(),
4954 "only VMThread can add previous versions");
4955
4956 ResourceMark rm;
4957 log_trace(redefine, class, iklass, add)
4958 ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count);
4959
4960 // Clean out old previous versions for this class
4961 purge_previous_version_list();
4962
4963 // Mark newly obsolete methods in remaining previous versions. An EMCP method from
4964 // a previous redefinition may be made obsolete by this redefinition.
4965 Array<Method*>* old_methods = scratch_class->methods();
4966 mark_newly_obsolete_methods(old_methods, emcp_method_count);
4967
4968 // If the constant pool for this previous version of the class
4969 // is not marked as being on the stack, then none of the methods
4970 // in this previous version of the class are on the stack so
4971 // we don't need to add this as a previous version.
4972 ConstantPool* cp_ref = scratch_class->constants();
4973 if (!cp_ref->on_stack()) {
4974 log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running");
4975 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class);
4976 return;
4977 }
4978
4979 // Add previous version if any methods are still running or if this is
4980 // a shared class which should never be removed.
4981 assert(scratch_class->previous_versions() == nullptr, "shouldn't have a previous version");
4982 scratch_class->link_previous_versions(previous_versions());
4983 link_previous_versions(scratch_class);
4984 if (cp_ref->in_aot_cache()) {
4985 log_trace(redefine, class, iklass, add) ("scratch class added; class is shared");
4986 } else {
4987 // We only set clean_previous_versions flag for processing during class
4988 // unloading for non-shared classes.
4989 _should_clean_previous_versions = true;
4990 log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack.");
4991 }
4992 } // end add_previous_version()
4993
4994 #endif // INCLUDE_JVMTI
4995
4996 Method* InstanceKlass::method_with_idnum(int idnum) const {
4997 Method* m = nullptr;
4998 if (idnum < methods()->length()) {
4999 m = methods()->at(idnum);
5000 }
5001 if (m == nullptr || m->method_idnum() != idnum) {
5002 for (int index = 0; index < methods()->length(); ++index) {
5003 m = methods()->at(index);
5004 if (m->method_idnum() == idnum) {
5005 return m;
5006 }
5007 }
5008 // None found, return null for the caller to handle.
5009 return nullptr;
5010 }
5011 return m;
5012 }
5013
5014
5015 Method* InstanceKlass::method_with_orig_idnum(int idnum) const {
5016 if (idnum >= methods()->length()) {
5017 return nullptr;
5018 }
5019 Method* m = methods()->at(idnum);
5020 if (m != nullptr && m->orig_method_idnum() == idnum) {
5021 return m;
5022 }
5023 // Obsolete method idnum does not match the original idnum
5024 for (int index = 0; index < methods()->length(); ++index) {
5025 m = methods()->at(index);
5026 if (m->orig_method_idnum() == idnum) {
5027 return m;
5028 }
5029 }
5030 // None found, return null for the caller to handle.
5031 return nullptr;
5032 }
5033
5034
5035 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) const {
5036 const InstanceKlass* holder = get_klass_version(version);
5037 if (holder == nullptr) {
5038 return nullptr; // The version of klass is gone, no method is found
5039 }
5040 return holder->method_with_orig_idnum(idnum);
5041 }
5042
5043 #if INCLUDE_JVMTI
5044 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() {
5045 return _cached_class_file;
5046 }
5047
5048 jint InstanceKlass::get_cached_class_file_len() {
5049 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
5050 }
5051
5052 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
5053 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
5054 }
5055 #endif
5056
5057 // Make a step iterating over the class hierarchy under the root class.
5058 // Skips subclasses if requested.
5059 void ClassHierarchyIterator::next() {
5060 assert(_current != nullptr, "required");
5061 if (_visit_subclasses && _current->subklass() != nullptr) {
5062 _current = _current->subklass();
5063 return; // visit next subclass
5064 }
5065 _visit_subclasses = true; // reset
5066 while (_current->next_sibling() == nullptr && _current != _root) {
5067 _current = _current->java_super(); // backtrack; no more sibling subclasses left
5068 }
5069 if (_current == _root) {
5070 // Iteration is over (back at root after backtracking). Invalidate the iterator.
5071 _current = nullptr;
5072 return;
5073 }
5074 _current = _current->next_sibling();
5075 return; // visit next sibling subclass
5076 }