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