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