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