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