1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/aotClassInitializer.hpp"
26 #include "cds/archiveUtils.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/cdsEnumKlass.hpp"
29 #include "cds/classListWriter.hpp"
30 #include "cds/heapShared.hpp"
31 #include "cds/metaspaceShared.hpp"
32 #include "classfile/classFileParser.hpp"
33 #include "classfile/classFileStream.hpp"
34 #include "classfile/classLoader.hpp"
35 #include "classfile/classLoaderData.inline.hpp"
36 #include "classfile/javaClasses.hpp"
37 #include "classfile/moduleEntry.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/systemDictionaryShared.hpp"
40 #include "classfile/verifier.hpp"
41 #include "classfile/vmClasses.hpp"
42 #include "classfile/vmSymbols.hpp"
43 #include "code/codeCache.hpp"
44 #include "code/dependencyContext.hpp"
45 #include "compiler/compilationPolicy.hpp"
46 #include "compiler/compileBroker.hpp"
47 #include "gc/shared/collectedHeap.inline.hpp"
48 #include "interpreter/bytecodeStream.hpp"
49 #include "interpreter/oopMapCache.hpp"
50 #include "interpreter/rewriter.hpp"
51 #include "jvm.h"
52 #include "jvmtifiles/jvmti.h"
53 #include "logging/log.hpp"
54 #include "klass.inline.hpp"
55 #include "logging/logMessage.hpp"
56 #include "logging/logStream.hpp"
57 #include "memory/allocation.inline.hpp"
58 #include "memory/iterator.inline.hpp"
59 #include "memory/metadataFactory.hpp"
60 #include "memory/metaspaceClosure.hpp"
61 #include "memory/oopFactory.hpp"
62 #include "memory/resourceArea.hpp"
63 #include "memory/universe.hpp"
64 #include "oops/fieldStreams.inline.hpp"
65 #include "oops/constantPool.hpp"
66 #include "oops/instanceClassLoaderKlass.hpp"
67 #include "oops/instanceKlass.inline.hpp"
68 #include "oops/instanceMirrorKlass.hpp"
69 #include "oops/instanceOop.hpp"
70 #include "oops/instanceStackChunkKlass.hpp"
71 #include "oops/klass.inline.hpp"
72 #include "oops/markWord.hpp"
73 #include "oops/method.hpp"
74 #include "oops/oop.inline.hpp"
75 #include "oops/recordComponent.hpp"
76 #include "oops/symbol.hpp"
77 #include "oops/inlineKlass.hpp"
78 #include "prims/jvmtiExport.hpp"
79 #include "prims/jvmtiRedefineClasses.hpp"
80 #include "prims/jvmtiThreadState.hpp"
81 #include "prims/methodComparator.hpp"
82 #include "runtime/arguments.hpp"
83 #include "runtime/deoptimization.hpp"
84 #include "runtime/atomic.hpp"
85 #include "runtime/fieldDescriptor.inline.hpp"
86 #include "runtime/handles.inline.hpp"
87 #include "runtime/javaCalls.hpp"
88 #include "runtime/javaThread.inline.hpp"
89 #include "runtime/mutexLocker.hpp"
90 #include "runtime/orderAccess.hpp"
91 #include "runtime/os.inline.hpp"
92 #include "runtime/reflection.hpp"
93 #include "runtime/synchronizer.hpp"
94 #include "runtime/threads.hpp"
95 #include "services/classLoadingService.hpp"
96 #include "services/finalizerService.hpp"
97 #include "services/threadService.hpp"
98 #include "utilities/dtrace.hpp"
99 #include "utilities/events.hpp"
100 #include "utilities/macros.hpp"
101 #include "utilities/nativeStackPrinter.hpp"
102 #include "utilities/pair.hpp"
103 #include "utilities/stringUtils.hpp"
104 #ifdef COMPILER1
105 #include "c1/c1_Compiler.hpp"
106 #endif
107 #if INCLUDE_JFR
108 #include "jfr/jfrEvents.hpp"
109 #endif
110
111 #ifdef DTRACE_ENABLED
112
113
114 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED
115 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE
116 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT
117 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS
118 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED
119 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT
120 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR
121 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END
122 #define DTRACE_CLASSINIT_PROBE(type, thread_type) \
123 { \
124 char* data = nullptr; \
125 int len = 0; \
126 Symbol* clss_name = name(); \
127 if (clss_name != nullptr) { \
128 data = (char*)clss_name->bytes(); \
129 len = clss_name->utf8_length(); \
130 } \
131 HOTSPOT_CLASS_INITIALIZATION_##type( \
132 data, len, (void*)class_loader(), thread_type); \
133 }
134
135 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) \
136 { \
137 char* data = nullptr; \
138 int len = 0; \
139 Symbol* clss_name = name(); \
140 if (clss_name != nullptr) { \
141 data = (char*)clss_name->bytes(); \
142 len = clss_name->utf8_length(); \
143 } \
144 HOTSPOT_CLASS_INITIALIZATION_##type( \
145 data, len, (void*)class_loader(), thread_type, wait); \
146 }
147
148 #else // ndef DTRACE_ENABLED
149
150 #define DTRACE_CLASSINIT_PROBE(type, thread_type)
151 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait)
152
153 #endif // ndef DTRACE_ENABLED
154
155 void InlineLayoutInfo::metaspace_pointers_do(MetaspaceClosure* it) {
156 log_trace(cds)("Iter(InlineFieldInfo): %p", this);
157 it->push(&_klass);
158 }
159
160 bool InstanceKlass::_finalization_enabled = true;
161
162 static inline bool is_class_loader(const Symbol* class_name,
163 const ClassFileParser& parser) {
164 assert(class_name != nullptr, "invariant");
165
166 if (class_name == vmSymbols::java_lang_ClassLoader()) {
167 return true;
168 }
169
170 if (vmClasses::ClassLoader_klass_loaded()) {
171 const Klass* const super_klass = parser.super_klass();
172 if (super_klass != nullptr) {
173 if (super_klass->is_subtype_of(vmClasses::ClassLoader_klass())) {
174 return true;
175 }
176 }
177 }
178 return false;
179 }
180
181 bool InstanceKlass::field_is_null_free_inline_type(int index) const {
182 return field(index).field_flags().is_null_free_inline_type();
183 }
184
185 bool InstanceKlass::is_class_in_loadable_descriptors_attribute(Symbol* name) const {
186 if (_loadable_descriptors == nullptr) return false;
187 for (int i = 0; i < _loadable_descriptors->length(); i++) {
188 Symbol* class_name = _constants->symbol_at(_loadable_descriptors->at(i));
189 if (class_name == name) return true;
190 }
191 return false;
192 }
193
194 static inline bool is_stack_chunk_class(const Symbol* class_name,
195 const ClassLoaderData* loader_data) {
196 return (class_name == vmSymbols::jdk_internal_vm_StackChunk() &&
197 loader_data->is_the_null_class_loader_data());
198 }
199
200 // private: called to verify that k is a static member of this nest.
201 // We know that k is an instance class in the same package and hence the
202 // same classloader.
203 bool InstanceKlass::has_nest_member(JavaThread* current, InstanceKlass* k) const {
204 assert(!is_hidden(), "unexpected hidden class");
205 if (_nest_members == nullptr || _nest_members == Universe::the_empty_short_array()) {
206 if (log_is_enabled(Trace, class, nestmates)) {
207 ResourceMark rm(current);
208 log_trace(class, nestmates)("Checked nest membership of %s in non-nest-host class %s",
209 k->external_name(), this->external_name());
210 }
211 return false;
212 }
213
214 if (log_is_enabled(Trace, class, nestmates)) {
215 ResourceMark rm(current);
216 log_trace(class, nestmates)("Checking nest membership of %s in %s",
217 k->external_name(), this->external_name());
218 }
219
220 // Check for the named class in _nest_members.
221 // We don't resolve, or load, any classes.
222 for (int i = 0; i < _nest_members->length(); i++) {
223 int cp_index = _nest_members->at(i);
224 Symbol* name = _constants->klass_name_at(cp_index);
225 if (name == k->name()) {
226 log_trace(class, nestmates)("- named class found at nest_members[%d] => cp[%d]", i, cp_index);
227 return true;
228 }
229 }
230 log_trace(class, nestmates)("- class is NOT a nest member!");
231 return false;
232 }
233
234 // Called to verify that k is a permitted subclass of this class.
235 // The incoming stringStream is used to format the messages for error logging and for the caller
236 // to use for exception throwing.
237 bool InstanceKlass::has_as_permitted_subclass(const InstanceKlass* k, stringStream& ss) const {
238 Thread* current = Thread::current();
239 assert(k != nullptr, "sanity check");
240 assert(_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array(),
241 "unexpected empty _permitted_subclasses array");
242
243 if (log_is_enabled(Trace, class, sealed)) {
244 ResourceMark rm(current);
245 log_trace(class, sealed)("Checking for permitted subclass %s in %s",
246 k->external_name(), this->external_name());
247 }
248
249 // Check that the class and its super are in the same module.
250 if (k->module() != this->module()) {
251 ss.print("Failed same module check: subclass %s is in module '%s' with loader %s, "
252 "and sealed class %s is in module '%s' with loader %s",
253 k->external_name(),
254 k->module()->name_as_C_string(),
255 k->module()->loader_data()->loader_name_and_id(),
256 this->external_name(),
257 this->module()->name_as_C_string(),
258 this->module()->loader_data()->loader_name_and_id());
259 log_trace(class, sealed)(" - %s", ss.as_string());
260 return false;
261 }
262
263 if (!k->is_public() && !is_same_class_package(k)) {
264 ss.print("Failed same package check: non-public subclass %s is in package '%s' with classloader %s, "
265 "and sealed class %s is in package '%s' with classloader %s",
266 k->external_name(),
267 k->package() != nullptr ? k->package()->name()->as_C_string() : "unnamed",
268 k->module()->loader_data()->loader_name_and_id(),
269 this->external_name(),
270 this->package() != nullptr ? this->package()->name()->as_C_string() : "unnamed",
271 this->module()->loader_data()->loader_name_and_id());
272 log_trace(class, sealed)(" - %s", ss.as_string());
273 return false;
274 }
275
276 for (int i = 0; i < _permitted_subclasses->length(); i++) {
277 int cp_index = _permitted_subclasses->at(i);
278 Symbol* name = _constants->klass_name_at(cp_index);
279 if (name == k->name()) {
280 log_trace(class, sealed)("- Found it at permitted_subclasses[%d] => cp[%d]", i, cp_index);
281 return true;
282 }
283 }
284
285 ss.print("Failed listed permitted subclass check: class %s is not a permitted subclass of %s",
286 k->external_name(), this->external_name());
287 log_trace(class, sealed)(" - %s", ss.as_string());
288 return false;
289 }
290
291 // Return nest-host class, resolving, validating and saving it if needed.
292 // In cases where this is called from a thread that cannot do classloading
293 // (such as a native JIT thread) then we simply return null, which in turn
294 // causes the access check to return false. Such code will retry the access
295 // from a more suitable environment later. Otherwise the _nest_host is always
296 // set once this method returns.
297 // Any errors from nest-host resolution must be preserved so they can be queried
298 // from higher-level access checking code, and reported as part of access checking
299 // exceptions.
300 // VirtualMachineErrors are propagated with a null return.
301 // Under any conditions where the _nest_host can be set to non-null the resulting
302 // value of it and, if applicable, the nest host resolution/validation error,
303 // are idempotent.
304 InstanceKlass* InstanceKlass::nest_host(TRAPS) {
305 InstanceKlass* nest_host_k = _nest_host;
306 if (nest_host_k != nullptr) {
307 return nest_host_k;
308 }
309
310 ResourceMark rm(THREAD);
311
312 // need to resolve and save our nest-host class.
313 if (_nest_host_index != 0) { // we have a real nest_host
314 // Before trying to resolve check if we're in a suitable context
315 bool can_resolve = THREAD->can_call_java();
316 if (!can_resolve && !_constants->tag_at(_nest_host_index).is_klass()) {
317 log_trace(class, nestmates)("Rejected resolution of nest-host of %s in unsuitable thread",
318 this->external_name());
319 return nullptr; // sentinel to say "try again from a different context"
320 }
321
322 log_trace(class, nestmates)("Resolving nest-host of %s using cp entry for %s",
323 this->external_name(),
324 _constants->klass_name_at(_nest_host_index)->as_C_string());
325
326 Klass* k = _constants->klass_at(_nest_host_index, THREAD);
327 if (HAS_PENDING_EXCEPTION) {
328 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
329 return nullptr; // propagate VMEs
330 }
331 stringStream ss;
332 char* target_host_class = _constants->klass_name_at(_nest_host_index)->as_C_string();
333 ss.print("Nest host resolution of %s with host %s failed: ",
334 this->external_name(), target_host_class);
335 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
336 const char* msg = ss.as_string(true /* on C-heap */);
337 constantPoolHandle cph(THREAD, constants());
338 SystemDictionary::add_nest_host_error(cph, _nest_host_index, msg);
339 CLEAR_PENDING_EXCEPTION;
340
341 log_trace(class, nestmates)("%s", msg);
342 } else {
343 // A valid nest-host is an instance class in the current package that lists this
344 // class as a nest member. If any of these conditions are not met the class is
345 // its own nest-host.
346 const char* error = nullptr;
347
348 // JVMS 5.4.4 indicates package check comes first
349 if (is_same_class_package(k)) {
350 // Now check actual membership. We can't be a member if our "host" is
351 // not an instance class.
352 if (k->is_instance_klass()) {
353 nest_host_k = InstanceKlass::cast(k);
354 bool is_member = nest_host_k->has_nest_member(THREAD, this);
355 if (is_member) {
356 _nest_host = nest_host_k; // save resolved nest-host value
357
358 log_trace(class, nestmates)("Resolved nest-host of %s to %s",
359 this->external_name(), k->external_name());
360 return nest_host_k;
361 } else {
362 error = "current type is not listed as a nest member";
363 }
364 } else {
365 error = "host is not an instance class";
366 }
367 } else {
368 error = "types are in different packages";
369 }
370
371 // something went wrong, so record what and log it
372 {
373 stringStream ss;
374 ss.print("Type %s (loader: %s) is not a nest member of type %s (loader: %s): %s",
375 this->external_name(),
376 this->class_loader_data()->loader_name_and_id(),
377 k->external_name(),
378 k->class_loader_data()->loader_name_and_id(),
379 error);
380 const char* msg = ss.as_string(true /* on C-heap */);
381 constantPoolHandle cph(THREAD, constants());
382 SystemDictionary::add_nest_host_error(cph, _nest_host_index, msg);
383 log_trace(class, nestmates)("%s", msg);
384 }
385 }
386 } else {
387 log_trace(class, nestmates)("Type %s is not part of a nest: setting nest-host to self",
388 this->external_name());
389 }
390
391 // Either not in an explicit nest, or else an error occurred, so
392 // the nest-host is set to `this`. Any thread that sees this assignment
393 // will also see any setting of nest_host_error(), if applicable.
394 return (_nest_host = this);
395 }
396
397 // Dynamic nest member support: set this class's nest host to the given class.
398 // This occurs as part of the class definition, as soon as the instanceKlass
399 // has been created and doesn't require further resolution. The code:
400 // lookup().defineHiddenClass(bytes_for_X, NESTMATE);
401 // results in:
402 // class_of_X.set_nest_host(lookup().lookupClass().getNestHost())
403 // If it has an explicit _nest_host_index or _nest_members, these will be ignored.
404 // We also know the "host" is a valid nest-host in the same package so we can
405 // assert some of those facts.
406 void InstanceKlass::set_nest_host(InstanceKlass* host) {
407 assert(is_hidden(), "must be a hidden class");
408 assert(host != nullptr, "null nest host specified");
409 assert(_nest_host == nullptr, "current class has resolved nest-host");
410 assert(nest_host_error() == nullptr, "unexpected nest host resolution error exists: %s",
411 nest_host_error());
412 assert((host->_nest_host == nullptr && host->_nest_host_index == 0) ||
413 (host->_nest_host == host), "proposed host is not a valid nest-host");
414 // Can't assert this as package is not set yet:
415 // assert(is_same_class_package(host), "proposed host is in wrong package");
416
417 if (log_is_enabled(Trace, class, nestmates)) {
418 ResourceMark rm;
419 const char* msg = "";
420 // a hidden class does not expect a statically defined nest-host
421 if (_nest_host_index > 0) {
422 msg = "(the NestHost attribute in the current class is ignored)";
423 } else if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
424 msg = "(the NestMembers attribute in the current class is ignored)";
425 }
426 log_trace(class, nestmates)("Injected type %s into the nest of %s %s",
427 this->external_name(),
428 host->external_name(),
429 msg);
430 }
431 // set dynamic nest host
432 _nest_host = host;
433 // Record dependency to keep nest host from being unloaded before this class.
434 ClassLoaderData* this_key = class_loader_data();
435 assert(this_key != nullptr, "sanity");
436 this_key->record_dependency(host);
437 }
438
439 // check if 'this' and k are nestmates (same nest_host), or k is our nest_host,
440 // or we are k's nest_host - all of which is covered by comparing the two
441 // resolved_nest_hosts.
442 // Any exceptions (i.e. VMEs) are propagated.
443 bool InstanceKlass::has_nestmate_access_to(InstanceKlass* k, TRAPS) {
444
445 assert(this != k, "this should be handled by higher-level code");
446
447 // Per JVMS 5.4.4 we first resolve and validate the current class, then
448 // the target class k.
449
450 InstanceKlass* cur_host = nest_host(CHECK_false);
451 if (cur_host == nullptr) {
452 return false;
453 }
454
455 Klass* k_nest_host = k->nest_host(CHECK_false);
456 if (k_nest_host == nullptr) {
457 return false;
458 }
459
460 bool access = (cur_host == k_nest_host);
461
462 ResourceMark rm(THREAD);
463 log_trace(class, nestmates)("Class %s does %shave nestmate access to %s",
464 this->external_name(),
465 access ? "" : "NOT ",
466 k->external_name());
467 return access;
468 }
469
470 const char* InstanceKlass::nest_host_error() {
471 if (_nest_host_index == 0) {
472 return nullptr;
473 } else {
474 constantPoolHandle cph(Thread::current(), constants());
475 return SystemDictionary::find_nest_host_error(cph, (int)_nest_host_index);
476 }
477 }
478
479 void* InstanceKlass::operator new(size_t size, ClassLoaderData* loader_data, size_t word_size,
480 bool use_class_space, TRAPS) throw() {
481 return Metaspace::allocate(loader_data, word_size, ClassType, use_class_space, THREAD);
482 }
483
484 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) {
485 const int size = InstanceKlass::size(parser.vtable_size(),
486 parser.itable_size(),
487 nonstatic_oop_map_size(parser.total_oop_map_count()),
488 parser.is_interface(),
489 parser.is_inline_type());
490
491 const Symbol* const class_name = parser.class_name();
492 assert(class_name != nullptr, "invariant");
493 ClassLoaderData* loader_data = parser.loader_data();
494 assert(loader_data != nullptr, "invariant");
495
496 InstanceKlass* ik;
497 const bool use_class_space = parser.klass_needs_narrow_id();
498
499 // Allocation
500 if (parser.is_instance_ref_klass()) {
501 // java.lang.ref.Reference
502 ik = new (loader_data, size, use_class_space, THREAD) InstanceRefKlass(parser);
503 } else if (class_name == vmSymbols::java_lang_Class()) {
504 // mirror - java.lang.Class
505 ik = new (loader_data, size, use_class_space, THREAD) InstanceMirrorKlass(parser);
506 } else if (is_stack_chunk_class(class_name, loader_data)) {
507 // stack chunk
508 ik = new (loader_data, size, use_class_space, THREAD) InstanceStackChunkKlass(parser);
509 } else if (is_class_loader(class_name, parser)) {
510 // class loader - java.lang.ClassLoader
511 ik = new (loader_data, size, use_class_space, THREAD) InstanceClassLoaderKlass(parser);
512 } else if (parser.is_inline_type()) {
513 // inline type
514 ik = new (loader_data, size, use_class_space, THREAD) InlineKlass(parser);
515 } else {
516 // normal
517 ik = new (loader_data, size, use_class_space, THREAD) InstanceKlass(parser);
518 }
519
520 if (ik != nullptr && UseCompressedClassPointers && use_class_space) {
521 assert(CompressedKlassPointers::is_encodable(ik),
522 "Klass " PTR_FORMAT "needs a narrow Klass ID, but is not encodable", p2i(ik));
523 }
524
525 // Check for pending exception before adding to the loader data and incrementing
526 // class count. Can get OOM here.
527 if (HAS_PENDING_EXCEPTION) {
528 return nullptr;
529 }
530
531 #ifdef ASSERT
532 ik->bounds_check((address) ik->start_of_vtable(), false, size);
533 ik->bounds_check((address) ik->start_of_itable(), false, size);
534 ik->bounds_check((address) ik->end_of_itable(), true, size);
535 ik->bounds_check((address) ik->end_of_nonstatic_oop_maps(), true, size);
536 #endif //ASSERT
537 return ik;
538 }
539
540 #ifndef PRODUCT
541 bool InstanceKlass::bounds_check(address addr, bool edge_ok, intptr_t size_in_bytes) const {
542 const char* bad = nullptr;
543 address end = nullptr;
544 if (addr < (address)this) {
545 bad = "before";
546 } else if (addr == (address)this) {
547 if (edge_ok) return true;
548 bad = "just before";
549 } else if (addr == (end = (address)this + sizeof(intptr_t) * (size_in_bytes < 0 ? size() : size_in_bytes))) {
550 if (edge_ok) return true;
551 bad = "just after";
552 } else if (addr > end) {
553 bad = "after";
554 } else {
555 return true;
556 }
557 tty->print_cr("%s object bounds: " INTPTR_FORMAT " [" INTPTR_FORMAT ".." INTPTR_FORMAT "]",
558 bad, (intptr_t)addr, (intptr_t)this, (intptr_t)end);
559 Verbose = WizardMode = true; this->print(); //@@
560 return false;
561 }
562 #endif //PRODUCT
563
564 // copy method ordering from resource area to Metaspace
565 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) {
566 if (m != nullptr) {
567 // allocate a new array and copy contents (memcpy?)
568 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
569 for (int i = 0; i < m->length(); i++) {
570 _method_ordering->at_put(i, m->at(i));
571 }
572 } else {
573 _method_ordering = Universe::the_empty_int_array();
574 }
575 }
576
577 // create a new array of vtable_indices for default methods
578 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
579 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
580 assert(default_vtable_indices() == nullptr, "only create once");
581 set_default_vtable_indices(vtable_indices);
582 return vtable_indices;
583 }
584
585
586 InstanceKlass::InstanceKlass() {
587 assert(CDSConfig::is_dumping_static_archive() || CDSConfig::is_using_archive(), "only for CDS");
588 }
589
590 InstanceKlass::InstanceKlass(const ClassFileParser& parser, KlassKind kind, markWord prototype_header, ReferenceType reference_type) :
591 Klass(kind, prototype_header),
592 _nest_members(nullptr),
593 _nest_host(nullptr),
594 _permitted_subclasses(nullptr),
595 _record_components(nullptr),
596 _static_field_size(parser.static_field_size()),
597 _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())),
598 _itable_len(parser.itable_size()),
599 _nest_host_index(0),
600 _init_state(allocated),
601 _reference_type(reference_type),
602 _init_thread(nullptr),
603 _inline_layout_info_array(nullptr),
604 _loadable_descriptors(nullptr),
605 _adr_inlineklass_fixed_block(nullptr)
606 {
607 set_vtable_length(parser.vtable_size());
608 set_access_flags(parser.access_flags());
609 if (parser.is_hidden()) set_is_hidden();
610 set_layout_helper(Klass::instance_layout_helper(parser.layout_size(),
611 false));
612 if (parser.has_inline_fields()) {
613 set_has_inline_type_fields();
614 }
615
616 assert(nullptr == _methods, "underlying memory not zeroed?");
617 assert(is_instance_klass(), "is layout incorrect?");
618 assert(size_helper() == parser.layout_size(), "incorrect size_helper?");
619 }
620
621 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
622 Array<Method*>* methods) {
623 if (methods != nullptr && methods != Universe::the_empty_method_array() &&
624 !methods->is_shared()) {
625 for (int i = 0; i < methods->length(); i++) {
626 Method* method = methods->at(i);
627 if (method == nullptr) continue; // maybe null if error processing
628 // Only want to delete methods that are not executing for RedefineClasses.
629 // The previous version will point to them so they're not totally dangling
630 assert (!method->on_stack(), "shouldn't be called with methods on stack");
631 MetadataFactory::free_metadata(loader_data, method);
632 }
633 MetadataFactory::free_array<Method*>(loader_data, methods);
634 }
635 }
636
637 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
638 const Klass* super_klass,
639 Array<InstanceKlass*>* local_interfaces,
640 Array<InstanceKlass*>* transitive_interfaces) {
641 // Only deallocate transitive interfaces if not empty, same as super class
642 // or same as local interfaces. See code in parseClassFile.
643 Array<InstanceKlass*>* ti = transitive_interfaces;
644 if (ti != Universe::the_empty_instance_klass_array() && ti != local_interfaces) {
645 // check that the interfaces don't come from super class
646 Array<InstanceKlass*>* sti = (super_klass == nullptr) ? nullptr :
647 InstanceKlass::cast(super_klass)->transitive_interfaces();
648 if (ti != sti && ti != nullptr && !ti->is_shared()) {
649 MetadataFactory::free_array<InstanceKlass*>(loader_data, ti);
650 }
651 }
652
653 // local interfaces can be empty
654 if (local_interfaces != Universe::the_empty_instance_klass_array() &&
655 local_interfaces != nullptr && !local_interfaces->is_shared()) {
656 MetadataFactory::free_array<InstanceKlass*>(loader_data, local_interfaces);
657 }
658 }
659
660 void InstanceKlass::deallocate_record_components(ClassLoaderData* loader_data,
661 Array<RecordComponent*>* record_components) {
662 if (record_components != nullptr && !record_components->is_shared()) {
663 for (int i = 0; i < record_components->length(); i++) {
664 RecordComponent* record_component = record_components->at(i);
665 MetadataFactory::free_metadata(loader_data, record_component);
666 }
667 MetadataFactory::free_array<RecordComponent*>(loader_data, record_components);
668 }
669 }
670
671 // This function deallocates the metadata and C heap pointers that the
672 // InstanceKlass points to.
673 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
674 // Orphan the mirror first, CMS thinks it's still live.
675 if (java_mirror() != nullptr) {
676 java_lang_Class::set_klass(java_mirror(), nullptr);
677 }
678
679 // Also remove mirror from handles
680 loader_data->remove_handle(_java_mirror);
681
682 // Need to take this class off the class loader data list.
683 loader_data->remove_class(this);
684
685 // The array_klass for this class is created later, after error handling.
686 // For class redefinition, we keep the original class so this scratch class
687 // doesn't have an array class. Either way, assert that there is nothing
688 // to deallocate.
689 assert(array_klasses() == nullptr, "array classes shouldn't be created for this class yet");
690
691 // Release C heap allocated data that this points to, which includes
692 // reference counting symbol names.
693 // Can't release the constant pool or MethodData C heap data here because the constant
694 // pool can be deallocated separately from the InstanceKlass for default methods and
695 // redefine classes. MethodData can also be released separately.
696 release_C_heap_structures(/* release_sub_metadata */ false);
697
698 deallocate_methods(loader_data, methods());
699 set_methods(nullptr);
700
701 deallocate_record_components(loader_data, record_components());
702 set_record_components(nullptr);
703
704 if (method_ordering() != nullptr &&
705 method_ordering() != Universe::the_empty_int_array() &&
706 !method_ordering()->is_shared()) {
707 MetadataFactory::free_array<int>(loader_data, method_ordering());
708 }
709 set_method_ordering(nullptr);
710
711 // default methods can be empty
712 if (default_methods() != nullptr &&
713 default_methods() != Universe::the_empty_method_array() &&
714 !default_methods()->is_shared()) {
715 MetadataFactory::free_array<Method*>(loader_data, default_methods());
716 }
717 // Do NOT deallocate the default methods, they are owned by superinterfaces.
718 set_default_methods(nullptr);
719
720 // default methods vtable indices can be empty
721 if (default_vtable_indices() != nullptr &&
722 !default_vtable_indices()->is_shared()) {
723 MetadataFactory::free_array<int>(loader_data, default_vtable_indices());
724 }
725 set_default_vtable_indices(nullptr);
726
727
728 // This array is in Klass, but remove it with the InstanceKlass since
729 // this place would be the only caller and it can share memory with transitive
730 // interfaces.
731 if (secondary_supers() != nullptr &&
732 secondary_supers() != Universe::the_empty_klass_array() &&
733 // see comments in compute_secondary_supers about the following cast
734 (address)(secondary_supers()) != (address)(transitive_interfaces()) &&
735 !secondary_supers()->is_shared()) {
736 MetadataFactory::free_array<Klass*>(loader_data, secondary_supers());
737 }
738 set_secondary_supers(nullptr, SECONDARY_SUPERS_BITMAP_EMPTY);
739
740 deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces());
741 set_transitive_interfaces(nullptr);
742 set_local_interfaces(nullptr);
743
744 if (fieldinfo_stream() != nullptr && !fieldinfo_stream()->is_shared()) {
745 MetadataFactory::free_array<u1>(loader_data, fieldinfo_stream());
746 }
747 set_fieldinfo_stream(nullptr);
748
749 if (fields_status() != nullptr && !fields_status()->is_shared()) {
750 MetadataFactory::free_array<FieldStatus>(loader_data, fields_status());
751 }
752 set_fields_status(nullptr);
753
754 if (inline_layout_info_array() != nullptr) {
755 MetadataFactory::free_array<InlineLayoutInfo>(loader_data, inline_layout_info_array());
756 }
757 set_inline_layout_info_array(nullptr);
758
759 // If a method from a redefined class is using this constant pool, don't
760 // delete it, yet. The new class's previous version will point to this.
761 if (constants() != nullptr) {
762 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack");
763 if (!constants()->is_shared()) {
764 MetadataFactory::free_metadata(loader_data, constants());
765 }
766 // Delete any cached resolution errors for the constant pool
767 SystemDictionary::delete_resolution_error(constants());
768
769 set_constants(nullptr);
770 }
771
772 if (inner_classes() != nullptr &&
773 inner_classes() != Universe::the_empty_short_array() &&
774 !inner_classes()->is_shared()) {
775 MetadataFactory::free_array<jushort>(loader_data, inner_classes());
776 }
777 set_inner_classes(nullptr);
778
779 if (nest_members() != nullptr &&
780 nest_members() != Universe::the_empty_short_array() &&
781 !nest_members()->is_shared()) {
782 MetadataFactory::free_array<jushort>(loader_data, nest_members());
783 }
784 set_nest_members(nullptr);
785
786 if (permitted_subclasses() != nullptr &&
787 permitted_subclasses() != Universe::the_empty_short_array() &&
788 !permitted_subclasses()->is_shared()) {
789 MetadataFactory::free_array<jushort>(loader_data, permitted_subclasses());
790 }
791 set_permitted_subclasses(nullptr);
792
793 if (loadable_descriptors() != nullptr &&
794 loadable_descriptors() != Universe::the_empty_short_array() &&
795 !loadable_descriptors()->is_shared()) {
796 MetadataFactory::free_array<jushort>(loader_data, loadable_descriptors());
797 }
798 set_loadable_descriptors(nullptr);
799
800 // We should deallocate the Annotations instance if it's not in shared spaces.
801 if (annotations() != nullptr && !annotations()->is_shared()) {
802 MetadataFactory::free_metadata(loader_data, annotations());
803 }
804 set_annotations(nullptr);
805
806 SystemDictionaryShared::handle_class_unloading(this);
807
808 #if INCLUDE_CDS_JAVA_HEAP
809 if (CDSConfig::is_dumping_heap()) {
810 HeapShared::remove_scratch_objects(this);
811 }
812 #endif
813 }
814
815 bool InstanceKlass::is_record() const {
816 return _record_components != nullptr &&
817 is_final() &&
818 java_super() == vmClasses::Record_klass();
819 }
820
821 bool InstanceKlass::is_sealed() const {
822 return _permitted_subclasses != nullptr &&
823 _permitted_subclasses != Universe::the_empty_short_array();
824 }
825
826 // JLS 8.9: An enum class is either implicitly final and derives
827 // from java.lang.Enum, or else is implicitly sealed to its
828 // anonymous subclasses. This query detects both kinds.
829 // It does not validate the finality or
830 // sealing conditions: it merely checks for a super of Enum.
831 // This is sufficient for recognizing well-formed enums.
832 bool InstanceKlass::is_enum_subclass() const {
833 InstanceKlass* s = java_super();
834 return (s == vmClasses::Enum_klass() ||
835 (s != nullptr && s->java_super() == vmClasses::Enum_klass()));
836 }
837
838 bool InstanceKlass::should_be_initialized() const {
839 return !is_initialized();
840 }
841
842 klassItable InstanceKlass::itable() const {
843 return klassItable(const_cast<InstanceKlass*>(this));
844 }
845
846 // JVMTI spec thinks there are signers and protection domain in the
847 // instanceKlass. These accessors pretend these fields are there.
848 // The hprof specification also thinks these fields are in InstanceKlass.
849 oop InstanceKlass::protection_domain() const {
850 // return the protection_domain from the mirror
851 return java_lang_Class::protection_domain(java_mirror());
852 }
853
854 objArrayOop InstanceKlass::signers() const {
855 // return the signers from the mirror
856 return java_lang_Class::signers(java_mirror());
857 }
858
859 oop InstanceKlass::init_lock() const {
860 // return the init lock from the mirror
861 oop lock = java_lang_Class::init_lock(java_mirror());
862 // Prevent reordering with any access of initialization state
863 OrderAccess::loadload();
864 assert(lock != nullptr || !is_not_initialized(), // initialized or in_error state
865 "only fully initialized state can have a null lock");
866 return lock;
867 }
868
869 // Set the initialization lock to null so the object can be GC'ed. Any racing
870 // threads to get this lock will see a null lock and will not lock.
871 // That's okay because they all check for initialized state after getting
872 // the lock and return.
873 void InstanceKlass::fence_and_clear_init_lock() {
874 // make sure previous stores are all done, notably the init_state.
875 OrderAccess::storestore();
876 java_lang_Class::clear_init_lock(java_mirror());
877 assert(!is_not_initialized(), "class must be initialized now");
878 }
879
880
881 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization
882 // process. The step comments refers to the procedure described in that section.
883 // Note: implementation moved to static method to expose the this pointer.
884 void InstanceKlass::initialize(TRAPS) {
885 if (this->should_be_initialized()) {
886 initialize_impl(CHECK);
887 // Note: at this point the class may be initialized
888 // OR it may be in the state of being initialized
889 // in case of recursive initialization!
890 } else {
891 assert(is_initialized(), "sanity check");
892 }
893 }
894
895 #ifdef ASSERT
896 void InstanceKlass::assert_no_clinit_will_run_for_aot_initialized_class() const {
897 assert(has_aot_initialized_mirror(), "must be");
898
899 InstanceKlass* s = java_super();
900 if (s != nullptr) {
901 DEBUG_ONLY(ResourceMark rm);
902 assert(s->is_initialized(), "super class %s of aot-inited class %s must have been initialized",
903 s->external_name(), external_name());
904 s->assert_no_clinit_will_run_for_aot_initialized_class();
905 }
906
907 Array<InstanceKlass*>* interfaces = local_interfaces();
908 int len = interfaces->length();
909 for (int i = 0; i < len; i++) {
910 InstanceKlass* intf = interfaces->at(i);
911 if (!intf->is_initialized()) {
912 ResourceMark rm;
913 // Note: an interface needs to be marked as is_initialized() only if
914 // - it has a <clinit>
915 // - it has declared a default method.
916 assert(!intf->interface_needs_clinit_execution_as_super(/*also_check_supers*/false),
917 "uninitialized super interface %s of aot-inited class %s must not have <clinit>",
918 intf->external_name(), external_name());
919 }
920 }
921 }
922 #endif
923
924 #if INCLUDE_CDS
925 void InstanceKlass::initialize_with_aot_initialized_mirror(TRAPS) {
926 assert(has_aot_initialized_mirror(), "must be");
927 assert(CDSConfig::is_loading_heap(), "must be");
928 assert(CDSConfig::is_using_aot_linked_classes(), "must be");
929 assert_no_clinit_will_run_for_aot_initialized_class();
930
931 if (is_initialized()) {
932 return;
933 }
934
935 if (log_is_enabled(Info, cds, init)) {
936 ResourceMark rm;
937 log_info(cds, init)("%s (aot-inited)", external_name());
938 }
939
940 link_class(CHECK);
941
942 #ifdef ASSERT
943 {
944 Handle h_init_lock(THREAD, init_lock());
945 ObjectLocker ol(h_init_lock, THREAD);
946 assert(!is_initialized(), "sanity");
947 assert(!is_being_initialized(), "sanity");
948 assert(!is_in_error_state(), "sanity");
949 }
950 #endif
951
952 set_init_thread(THREAD);
953 AOTClassInitializer::call_runtime_setup(THREAD, this);
954 set_initialization_state_and_notify(fully_initialized, CHECK);
955 }
956 #endif
957
958 bool InstanceKlass::verify_code(TRAPS) {
959 // 1) Verify the bytecodes
960 return Verifier::verify(this, should_verify_class(), THREAD);
961 }
962
963 void InstanceKlass::link_class(TRAPS) {
964 assert(is_loaded(), "must be loaded");
965 if (!is_linked()) {
966 link_class_impl(CHECK);
967 }
968 }
969
970 // Called to verify that a class can link during initialization, without
971 // throwing a VerifyError.
972 bool InstanceKlass::link_class_or_fail(TRAPS) {
973 assert(is_loaded(), "must be loaded");
974 if (!is_linked()) {
975 link_class_impl(CHECK_false);
976 }
977 return is_linked();
978 }
979
980 bool InstanceKlass::link_class_impl(TRAPS) {
981 if (CDSConfig::is_dumping_static_archive() && SystemDictionaryShared::has_class_failed_verification(this)) {
982 // This is for CDS static dump only -- we use the in_error_state to indicate that
983 // the class has failed verification. Throwing the NoClassDefFoundError here is just
984 // a convenient way to stop repeat attempts to verify the same (bad) class.
985 //
986 // Note that the NoClassDefFoundError is not part of the JLS, and should not be thrown
987 // if we are executing Java code. This is not a problem for CDS dumping phase since
988 // it doesn't execute any Java code.
989 ResourceMark rm(THREAD);
990 // Names are all known to be < 64k so we know this formatted message is not excessively large.
991 Exceptions::fthrow(THREAD_AND_LOCATION,
992 vmSymbols::java_lang_NoClassDefFoundError(),
993 "Class %s, or one of its supertypes, failed class initialization",
994 external_name());
995 return false;
996 }
997 // return if already verified
998 if (is_linked()) {
999 return true;
1000 }
1001
1002 // Timing
1003 // timer handles recursion
1004 JavaThread* jt = THREAD;
1005
1006 // link super class before linking this class
1007 Klass* super_klass = super();
1008 if (super_klass != nullptr) {
1009 if (super_klass->is_interface()) { // check if super class is an interface
1010 ResourceMark rm(THREAD);
1011 // Names are all known to be < 64k so we know this formatted message is not excessively large.
1012 Exceptions::fthrow(
1013 THREAD_AND_LOCATION,
1014 vmSymbols::java_lang_IncompatibleClassChangeError(),
1015 "class %s has interface %s as super class",
1016 external_name(),
1017 super_klass->external_name()
1018 );
1019 return false;
1020 }
1021
1022 InstanceKlass* ik_super = InstanceKlass::cast(super_klass);
1023 ik_super->link_class_impl(CHECK_false);
1024 }
1025
1026 // link all interfaces implemented by this class before linking this class
1027 Array<InstanceKlass*>* interfaces = local_interfaces();
1028 int num_interfaces = interfaces->length();
1029 for (int index = 0; index < num_interfaces; index++) {
1030 InstanceKlass* interk = interfaces->at(index);
1031 interk->link_class_impl(CHECK_false);
1032 }
1033
1034
1035 // If a class declares a method that uses an inline class as an argument
1036 // type or return inline type, this inline class must be loaded during the
1037 // linking of this class because size and properties of the inline class
1038 // must be known in order to be able to perform inline type optimizations.
1039 // The implementation below is an approximation of this rule, the code
1040 // iterates over all methods of the current class (including overridden
1041 // methods), not only the methods declared by this class. This
1042 // approximation makes the code simpler, and doesn't change the semantic
1043 // because classes declaring methods overridden by the current class are
1044 // linked (and have performed their own pre-loading) before the linking
1045 // of the current class.
1046
1047
1048 // Note:
1049 // Inline class types are loaded during
1050 // the loading phase (see ClassFileParser::post_process_parsed_stream()).
1051 // Inline class types used as element types for array creation
1052 // are not pre-loaded. Their loading is triggered by either anewarray
1053 // or multianewarray bytecodes.
1054
1055 // Could it be possible to do the following processing only if the
1056 // class uses inline types?
1057 if (EnableValhalla) {
1058 ResourceMark rm(THREAD);
1059 for (AllFieldStream fs(this); !fs.done(); fs.next()) {
1060 if (fs.is_null_free_inline_type() && fs.access_flags().is_static()) {
1061 assert(fs.access_flags().is_strict(), "null-free fields must be strict");
1062 Symbol* sig = fs.signature();
1063 TempNewSymbol s = Signature::strip_envelope(sig);
1064 if (s != name()) {
1065 log_info(class, preload)("Preloading class %s during linking of class %s. Cause: a null-free static field is declared with this type", s->as_C_string(), name()->as_C_string());
1066 Klass* klass = SystemDictionary::resolve_or_fail(s,
1067 Handle(THREAD, class_loader()), true,
1068 CHECK_false);
1069 if (HAS_PENDING_EXCEPTION) {
1070 log_warning(class, preload)("Preloading of class %s during linking of class %s (cause: null-free static field) failed: %s",
1071 s->as_C_string(), name()->as_C_string(), PENDING_EXCEPTION->klass()->name()->as_C_string());
1072 return false; // Exception is still pending
1073 }
1074 log_info(class, preload)("Preloading of class %s during linking of class %s (cause: null-free static field) succeeded",
1075 s->as_C_string(), name()->as_C_string());
1076 assert(klass != nullptr, "Sanity check");
1077 if (klass->is_abstract()) {
1078 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(),
1079 err_msg("Class %s expects class %s to be concrete value class, but it is an abstract class",
1080 name()->as_C_string(),
1081 InstanceKlass::cast(klass)->external_name()), false);
1082 }
1083 if (!klass->is_inline_klass()) {
1084 THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(),
1085 err_msg("class %s expects class %s to be a value class but it is an identity class",
1086 name()->as_C_string(), klass->external_name()), false);
1087 }
1088 InlineKlass* vk = InlineKlass::cast(klass);
1089 // if (!vk->is_implicitly_constructible()) {
1090 // THROW_MSG_(vmSymbols::java_lang_IncompatibleClassChangeError(),
1091 // err_msg("class %s is not implicitly constructible and it is used in a null restricted static field (not supported)",
1092 // klass->external_name()), false);
1093 // }
1094 // the inline_type_field_klasses_array might have been loaded with CDS, so update only if not already set and check consistency
1095 InlineLayoutInfo* li = inline_layout_info_adr(fs.index());
1096 if (li->klass() == nullptr) {
1097 li->set_klass(InlineKlass::cast(vk));
1098 li->set_kind(LayoutKind::REFERENCE);
1099 }
1100 assert(get_inline_type_field_klass(fs.index()) == vk, "Must match");
1101 } else {
1102 InlineLayoutInfo* li = inline_layout_info_adr(fs.index());
1103 if (li->klass() == nullptr) {
1104 li->set_klass(InlineKlass::cast(this));
1105 li->set_kind(LayoutKind::REFERENCE);
1106 }
1107 assert(get_inline_type_field_klass(fs.index()) == this, "Must match");
1108 }
1109 }
1110 }
1111
1112 // Aggressively preloading all classes from the LoadableDescriptors attribute
1113 if (loadable_descriptors() != nullptr) {
1114 HandleMark hm(THREAD);
1115 for (int i = 0; i < loadable_descriptors()->length(); i++) {
1116 Symbol* sig = constants()->symbol_at(loadable_descriptors()->at(i));
1117 if (!Signature::has_envelope(sig)) continue;
1118 TempNewSymbol class_name = Signature::strip_envelope(sig);
1119 if (class_name == name()) continue;
1120 log_info(class, preload)("Preloading class %s during linking of class %s because of the class is listed in the LoadableDescriptors attribute", sig->as_C_string(), name()->as_C_string());
1121 oop loader = class_loader();
1122 Klass* klass = SystemDictionary::resolve_or_null(class_name,
1123 Handle(THREAD, loader), THREAD);
1124 if (HAS_PENDING_EXCEPTION) {
1125 CLEAR_PENDING_EXCEPTION;
1126 }
1127 if (klass != nullptr) {
1128 log_info(class, preload)("Preloading of class %s during linking of class %s (cause: LoadableDescriptors attribute) succeeded", class_name->as_C_string(), name()->as_C_string());
1129 if (!klass->is_inline_klass()) {
1130 // Non value class are allowed by the current spec, but it could be an indication of an issue so let's log a warning
1131 log_warning(class, preload)("Preloading class %s during linking of class %s (cause: LoadableDescriptors attribute) but loaded class is not a value class", class_name->as_C_string(), name()->as_C_string());
1132 }
1133 } else {
1134 log_warning(class, preload)("Preloading of class %s during linking of class %s (cause: LoadableDescriptors attribute) failed", class_name->as_C_string(), name()->as_C_string());
1135 }
1136 }
1137 }
1138 }
1139
1140 // in case the class is linked in the process of linking its superclasses
1141 if (is_linked()) {
1142 return true;
1143 }
1144
1145 // trace only the link time for this klass that includes
1146 // the verification time
1147 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
1148 ClassLoader::perf_class_link_selftime(),
1149 ClassLoader::perf_classes_linked(),
1150 jt->get_thread_stat()->perf_recursion_counts_addr(),
1151 jt->get_thread_stat()->perf_timers_addr(),
1152 PerfClassTraceTime::CLASS_LINK);
1153
1154 // verification & rewriting
1155 {
1156 HandleMark hm(THREAD);
1157 Handle h_init_lock(THREAD, init_lock());
1158 ObjectLocker ol(h_init_lock, jt);
1159 // rewritten will have been set if loader constraint error found
1160 // on an earlier link attempt
1161 // don't verify or rewrite if already rewritten
1162 //
1163
1164 if (!is_linked()) {
1165 if (!is_rewritten()) {
1166 if (is_shared()) {
1167 assert(!verified_at_dump_time(), "must be");
1168 }
1169 {
1170 bool verify_ok = verify_code(THREAD);
1171 if (!verify_ok) {
1172 return false;
1173 }
1174 }
1175
1176 // Just in case a side-effect of verify linked this class already
1177 // (which can sometimes happen since the verifier loads classes
1178 // using custom class loaders, which are free to initialize things)
1179 if (is_linked()) {
1180 return true;
1181 }
1182
1183 // also sets rewritten
1184 rewrite_class(CHECK_false);
1185 } else if (is_shared()) {
1186 SystemDictionaryShared::check_verification_constraints(this, CHECK_false);
1187 }
1188
1189 // relocate jsrs and link methods after they are all rewritten
1190 link_methods(CHECK_false);
1191
1192 // Initialize the vtable and interface table after
1193 // methods have been rewritten since rewrite may
1194 // fabricate new Method*s.
1195 // also does loader constraint checking
1196 //
1197 // initialize_vtable and initialize_itable need to be rerun
1198 // for a shared class if
1199 // 1) the class is loaded by custom class loader or
1200 // 2) the class is loaded by built-in class loader but failed to add archived loader constraints or
1201 // 3) the class was not verified during dump time
1202 bool need_init_table = true;
1203 if (is_shared() && verified_at_dump_time() &&
1204 SystemDictionaryShared::check_linking_constraints(THREAD, this)) {
1205 need_init_table = false;
1206 }
1207 if (need_init_table) {
1208 vtable().initialize_vtable_and_check_constraints(CHECK_false);
1209 itable().initialize_itable_and_check_constraints(CHECK_false);
1210 }
1211 #ifdef ASSERT
1212 vtable().verify(tty, true);
1213 // In case itable verification is ever added.
1214 // itable().verify(tty, true);
1215 #endif
1216 if (Universe::is_fully_initialized()) {
1217 DeoptimizationScope deopt_scope;
1218 {
1219 // Now mark all code that assumes the class is not linked.
1220 // Set state under the Compile_lock also.
1221 MutexLocker ml(THREAD, Compile_lock);
1222
1223 set_init_state(linked);
1224 CodeCache::mark_dependents_on(&deopt_scope, this);
1225 }
1226 // Perform the deopt handshake outside Compile_lock.
1227 deopt_scope.deoptimize_marked();
1228 } else {
1229 set_init_state(linked);
1230 }
1231 if (JvmtiExport::should_post_class_prepare()) {
1232 JvmtiExport::post_class_prepare(THREAD, this);
1233 }
1234 }
1235 }
1236 return true;
1237 }
1238
1239 // Rewrite the byte codes of all of the methods of a class.
1240 // The rewriter must be called exactly once. Rewriting must happen after
1241 // verification but before the first method of the class is executed.
1242 void InstanceKlass::rewrite_class(TRAPS) {
1243 assert(is_loaded(), "must be loaded");
1244 if (is_rewritten()) {
1245 assert(is_shared(), "rewriting an unshared class?");
1246 return;
1247 }
1248 Rewriter::rewrite(this, CHECK);
1249 set_rewritten();
1250 }
1251
1252 // Now relocate and link method entry points after class is rewritten.
1253 // This is outside is_rewritten flag. In case of an exception, it can be
1254 // executed more than once.
1255 void InstanceKlass::link_methods(TRAPS) {
1256 PerfTraceTime timer(ClassLoader::perf_ik_link_methods_time());
1257
1258 int len = methods()->length();
1259 for (int i = len-1; i >= 0; i--) {
1260 methodHandle m(THREAD, methods()->at(i));
1261
1262 // Set up method entry points for compiler and interpreter .
1263 m->link_method(m, CHECK);
1264 }
1265 }
1266
1267 // Eagerly initialize superinterfaces that declare default methods (concrete instance: any access)
1268 void InstanceKlass::initialize_super_interfaces(TRAPS) {
1269 assert (has_nonstatic_concrete_methods(), "caller should have checked this");
1270 for (int i = 0; i < local_interfaces()->length(); ++i) {
1271 InstanceKlass* ik = local_interfaces()->at(i);
1272
1273 // Initialization is depth first search ie. we start with top of the inheritance tree
1274 // has_nonstatic_concrete_methods drives searching superinterfaces since it
1275 // means has_nonstatic_concrete_methods in its superinterface hierarchy
1276 if (ik->has_nonstatic_concrete_methods()) {
1277 ik->initialize_super_interfaces(CHECK);
1278 }
1279
1280 // Only initialize() interfaces that "declare" concrete methods.
1281 if (ik->should_be_initialized() && ik->declares_nonstatic_concrete_methods()) {
1282 ik->initialize(CHECK);
1283 }
1284 }
1285 }
1286
1287 using InitializationErrorTable = ResourceHashtable<const InstanceKlass*, OopHandle, 107, AnyObj::C_HEAP, mtClass>;
1288 static InitializationErrorTable* _initialization_error_table;
1289
1290 void InstanceKlass::add_initialization_error(JavaThread* current, Handle exception) {
1291 // Create the same exception with a message indicating the thread name,
1292 // and the StackTraceElements.
1293 Handle init_error = java_lang_Throwable::create_initialization_error(current, exception);
1294 ResourceMark rm(current);
1295 if (init_error.is_null()) {
1296 log_trace(class, init)("Unable to create the desired initialization error for class %s", external_name());
1297
1298 // We failed to create the new exception, most likely due to either out-of-memory or
1299 // a stackoverflow error. If the original exception was either of those then we save
1300 // the shared, pre-allocated, stackless, instance of that exception.
1301 if (exception->klass() == vmClasses::StackOverflowError_klass()) {
1302 log_debug(class, init)("Using shared StackOverflowError as initialization error for class %s", external_name());
1303 init_error = Handle(current, Universe::class_init_stack_overflow_error());
1304 } else if (exception->klass() == vmClasses::OutOfMemoryError_klass()) {
1305 log_debug(class, init)("Using shared OutOfMemoryError as initialization error for class %s", external_name());
1306 init_error = Handle(current, Universe::class_init_out_of_memory_error());
1307 } else {
1308 return;
1309 }
1310 }
1311
1312 MutexLocker ml(current, ClassInitError_lock);
1313 OopHandle elem = OopHandle(Universe::vm_global(), init_error());
1314 bool created;
1315 if (_initialization_error_table == nullptr) {
1316 _initialization_error_table = new (mtClass) InitializationErrorTable();
1317 }
1318 _initialization_error_table->put_if_absent(this, elem, &created);
1319 assert(created, "Initialization is single threaded");
1320 log_trace(class, init)("Initialization error added for class %s", external_name());
1321 }
1322
1323 oop InstanceKlass::get_initialization_error(JavaThread* current) {
1324 MutexLocker ml(current, ClassInitError_lock);
1325 if (_initialization_error_table == nullptr) {
1326 return nullptr;
1327 }
1328 OopHandle* h = _initialization_error_table->get(this);
1329 return (h != nullptr) ? h->resolve() : nullptr;
1330 }
1331
1332 // Need to remove entries for unloaded classes.
1333 void InstanceKlass::clean_initialization_error_table() {
1334 struct InitErrorTableCleaner {
1335 bool do_entry(const InstanceKlass* ik, OopHandle h) {
1336 if (!ik->is_loader_alive()) {
1337 h.release(Universe::vm_global());
1338 return true;
1339 } else {
1340 return false;
1341 }
1342 }
1343 };
1344
1345 assert_locked_or_safepoint(ClassInitError_lock);
1346 InitErrorTableCleaner cleaner;
1347 if (_initialization_error_table != nullptr) {
1348 _initialization_error_table->unlink(&cleaner);
1349 }
1350 }
1351
1352 void InstanceKlass::initialize_impl(TRAPS) {
1353 HandleMark hm(THREAD);
1354
1355 // Make sure klass is linked (verified) before initialization
1356 // A class could already be verified, since it has been reflected upon.
1357 link_class(CHECK);
1358
1359 DTRACE_CLASSINIT_PROBE(required, -1);
1360
1361 bool wait = false;
1362
1363 JavaThread* jt = THREAD;
1364
1365 bool debug_logging_enabled = log_is_enabled(Debug, class, init);
1366
1367 // refer to the JVM book page 47 for description of steps
1368 // Step 1
1369 {
1370 Handle h_init_lock(THREAD, init_lock());
1371 ObjectLocker ol(h_init_lock, jt);
1372
1373 // Step 2
1374 // If we were to use wait() instead of waitInterruptibly() then
1375 // we might end up throwing IE from link/symbol resolution sites
1376 // that aren't expected to throw. This would wreak havoc. See 6320309.
1377 while (is_being_initialized() && !is_reentrant_initialization(jt)) {
1378 if (debug_logging_enabled) {
1379 ResourceMark rm(jt);
1380 log_debug(class, init)("Thread \"%s\" waiting for initialization of %s by thread \"%s\"",
1381 jt->name(), external_name(), init_thread_name());
1382 }
1383 wait = true;
1384 jt->set_class_to_be_initialized(this);
1385 ol.wait_uninterruptibly(jt);
1386 jt->set_class_to_be_initialized(nullptr);
1387 }
1388
1389 // Step 3
1390 if (is_being_initialized() && is_reentrant_initialization(jt)) {
1391 if (debug_logging_enabled) {
1392 ResourceMark rm(jt);
1393 log_debug(class, init)("Thread \"%s\" recursively initializing %s",
1394 jt->name(), external_name());
1395 }
1396 DTRACE_CLASSINIT_PROBE_WAIT(recursive, -1, wait);
1397 return;
1398 }
1399
1400 // Step 4
1401 if (is_initialized()) {
1402 if (debug_logging_enabled) {
1403 ResourceMark rm(jt);
1404 log_debug(class, init)("Thread \"%s\" found %s already initialized",
1405 jt->name(), external_name());
1406 }
1407 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, -1, wait);
1408 return;
1409 }
1410
1411 // Step 5
1412 if (is_in_error_state()) {
1413 if (debug_logging_enabled) {
1414 ResourceMark rm(jt);
1415 log_debug(class, init)("Thread \"%s\" found %s is in error state",
1416 jt->name(), external_name());
1417 }
1418
1419 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait);
1420 ResourceMark rm(THREAD);
1421 Handle cause(THREAD, get_initialization_error(THREAD));
1422
1423 stringStream ss;
1424 ss.print("Could not initialize class %s", external_name());
1425 if (cause.is_null()) {
1426 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), ss.as_string());
1427 } else {
1428 THROW_MSG_CAUSE(vmSymbols::java_lang_NoClassDefFoundError(),
1429 ss.as_string(), cause);
1430 }
1431 } else {
1432
1433 // Step 6
1434 set_init_state(being_initialized);
1435 set_init_thread(jt);
1436 if (debug_logging_enabled) {
1437 ResourceMark rm(jt);
1438 log_debug(class, init)("Thread \"%s\" is initializing %s",
1439 jt->name(), external_name());
1440 }
1441 }
1442 }
1443
1444 // Pre-allocating an all-zero value to be used to reset nullable flat storages
1445 if (is_inline_klass()) {
1446 InlineKlass* vk = InlineKlass::cast(this);
1447 if (vk->has_nullable_atomic_layout()) {
1448 oop val = vk->allocate_instance(THREAD);
1449 if (HAS_PENDING_EXCEPTION) {
1450 Handle e(THREAD, PENDING_EXCEPTION);
1451 CLEAR_PENDING_EXCEPTION;
1452 {
1453 EXCEPTION_MARK;
1454 add_initialization_error(THREAD, e);
1455 // Locks object, set state, and notify all waiting threads
1456 set_initialization_state_and_notify(initialization_error, THREAD);
1457 CLEAR_PENDING_EXCEPTION;
1458 }
1459 THROW_OOP(e());
1460 }
1461 vk->set_null_reset_value(val);
1462 }
1463 }
1464
1465 // Step 7
1466 // Next, if C is a class rather than an interface, initialize it's super class and super
1467 // interfaces.
1468 if (!is_interface()) {
1469 Klass* super_klass = super();
1470 if (super_klass != nullptr && super_klass->should_be_initialized()) {
1471 super_klass->initialize(THREAD);
1472 }
1473 // If C implements any interface that declares a non-static, concrete method,
1474 // the initialization of C triggers initialization of its super interfaces.
1475 // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and
1476 // having a superinterface that declares, non-static, concrete methods
1477 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) {
1478 initialize_super_interfaces(THREAD);
1479 }
1480
1481 // If any exceptions, complete abruptly, throwing the same exception as above.
1482 if (HAS_PENDING_EXCEPTION) {
1483 Handle e(THREAD, PENDING_EXCEPTION);
1484 CLEAR_PENDING_EXCEPTION;
1485 {
1486 EXCEPTION_MARK;
1487 add_initialization_error(THREAD, e);
1488 // Locks object, set state, and notify all waiting threads
1489 set_initialization_state_and_notify(initialization_error, THREAD);
1490 CLEAR_PENDING_EXCEPTION;
1491 }
1492 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait);
1493 THROW_OOP(e());
1494 }
1495 }
1496
1497 // Step 8
1498 {
1499 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
1500 if (class_initializer() != nullptr) {
1501 // Timer includes any side effects of class initialization (resolution,
1502 // etc), but not recursive entry into call_class_initializer().
1503 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
1504 ClassLoader::perf_class_init_selftime(),
1505 ClassLoader::perf_classes_inited(),
1506 jt->get_thread_stat()->perf_recursion_counts_addr(),
1507 jt->get_thread_stat()->perf_timers_addr(),
1508 PerfClassTraceTime::CLASS_CLINIT);
1509 call_class_initializer(THREAD);
1510 } else {
1511 // The elapsed time is so small it's not worth counting.
1512 if (UsePerfData) {
1513 ClassLoader::perf_classes_inited()->inc();
1514 }
1515 call_class_initializer(THREAD);
1516 }
1517 }
1518
1519 // Step 9
1520 if (!HAS_PENDING_EXCEPTION) {
1521 set_initialization_state_and_notify(fully_initialized, CHECK);
1522 debug_only(vtable().verify(tty, true);)
1523 }
1524 else {
1525 // Step 10 and 11
1526 Handle e(THREAD, PENDING_EXCEPTION);
1527 CLEAR_PENDING_EXCEPTION;
1528 // JVMTI has already reported the pending exception
1529 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1530 JvmtiExport::clear_detected_exception(jt);
1531 {
1532 EXCEPTION_MARK;
1533 add_initialization_error(THREAD, e);
1534 set_initialization_state_and_notify(initialization_error, THREAD);
1535 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below
1536 // JVMTI has already reported the pending exception
1537 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1538 JvmtiExport::clear_detected_exception(jt);
1539 }
1540 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
1541 if (e->is_a(vmClasses::Error_klass())) {
1542 THROW_OOP(e());
1543 } else {
1544 JavaCallArguments args(e);
1545 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
1546 vmSymbols::throwable_void_signature(),
1547 &args);
1548 }
1549 }
1550 DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait);
1551 }
1552
1553
1554 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) {
1555 Handle h_init_lock(THREAD, init_lock());
1556 if (h_init_lock() != nullptr) {
1557 ObjectLocker ol(h_init_lock, THREAD);
1558 set_init_thread(nullptr); // reset _init_thread before changing _init_state
1559 set_init_state(state);
1560 fence_and_clear_init_lock();
1561 ol.notify_all(CHECK);
1562 } else {
1563 assert(h_init_lock() != nullptr, "The initialization state should never be set twice");
1564 set_init_thread(nullptr); // reset _init_thread before changing _init_state
1565 set_init_state(state);
1566 }
1567 }
1568
1569 // Update hierarchy. This is done before the new klass has been added to the SystemDictionary. The Compile_lock
1570 // is grabbed, to ensure that the compiler is not using the class hierarchy.
1571 void InstanceKlass::add_to_hierarchy(JavaThread* current) {
1572 assert(!SafepointSynchronize::is_at_safepoint(), "must NOT be at safepoint");
1573
1574 DeoptimizationScope deopt_scope;
1575 {
1576 MutexLocker ml(current, Compile_lock);
1577
1578 set_init_state(InstanceKlass::loaded);
1579 // make sure init_state store is already done.
1580 // The compiler reads the hierarchy outside of the Compile_lock.
1581 // Access ordering is used to add to hierarchy.
1582
1583 // Link into hierarchy.
1584 append_to_sibling_list(); // add to superklass/sibling list
1585 process_interfaces(); // handle all "implements" declarations
1586
1587 // Now mark all code that depended on old class hierarchy.
1588 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97)
1589 if (Universe::is_fully_initialized()) {
1590 CodeCache::mark_dependents_on(&deopt_scope, this);
1591 }
1592 }
1593 // Perform the deopt handshake outside Compile_lock.
1594 deopt_scope.deoptimize_marked();
1595 }
1596
1597
1598 InstanceKlass* InstanceKlass::implementor() const {
1599 InstanceKlass* volatile* ik = adr_implementor();
1600 if (ik == nullptr) {
1601 return nullptr;
1602 } else {
1603 // This load races with inserts, and therefore needs acquire.
1604 InstanceKlass* ikls = Atomic::load_acquire(ik);
1605 if (ikls != nullptr && !ikls->is_loader_alive()) {
1606 return nullptr; // don't return unloaded class
1607 } else {
1608 return ikls;
1609 }
1610 }
1611 }
1612
1613
1614 void InstanceKlass::set_implementor(InstanceKlass* ik) {
1615 assert_locked_or_safepoint(Compile_lock);
1616 assert(is_interface(), "not interface");
1617 InstanceKlass* volatile* addr = adr_implementor();
1618 assert(addr != nullptr, "null addr");
1619 if (addr != nullptr) {
1620 Atomic::release_store(addr, ik);
1621 }
1622 }
1623
1624 int InstanceKlass::nof_implementors() const {
1625 InstanceKlass* ik = implementor();
1626 if (ik == nullptr) {
1627 return 0;
1628 } else if (ik != this) {
1629 return 1;
1630 } else {
1631 return 2;
1632 }
1633 }
1634
1635 // The embedded _implementor field can only record one implementor.
1636 // When there are more than one implementors, the _implementor field
1637 // is set to the interface Klass* itself. Following are the possible
1638 // values for the _implementor field:
1639 // null - no implementor
1640 // implementor Klass* - one implementor
1641 // self - more than one implementor
1642 //
1643 // The _implementor field only exists for interfaces.
1644 void InstanceKlass::add_implementor(InstanceKlass* ik) {
1645 if (Universe::is_fully_initialized()) {
1646 assert_lock_strong(Compile_lock);
1647 }
1648 assert(is_interface(), "not interface");
1649 // Filter out my subinterfaces.
1650 // (Note: Interfaces are never on the subklass list.)
1651 if (ik->is_interface()) return;
1652
1653 // Filter out subclasses whose supers already implement me.
1654 // (Note: CHA must walk subclasses of direct implementors
1655 // in order to locate indirect implementors.)
1656 InstanceKlass* super_ik = ik->java_super();
1657 if (super_ik != nullptr && super_ik->implements_interface(this))
1658 // We only need to check one immediate superclass, since the
1659 // implements_interface query looks at transitive_interfaces.
1660 // Any supers of the super have the same (or fewer) transitive_interfaces.
1661 return;
1662
1663 InstanceKlass* iklass = implementor();
1664 if (iklass == nullptr) {
1665 set_implementor(ik);
1666 } else if (iklass != this && iklass != ik) {
1667 // There is already an implementor. Use itself as an indicator of
1668 // more than one implementors.
1669 set_implementor(this);
1670 }
1671
1672 // The implementor also implements the transitive_interfaces
1673 for (int index = 0; index < local_interfaces()->length(); index++) {
1674 local_interfaces()->at(index)->add_implementor(ik);
1675 }
1676 }
1677
1678 void InstanceKlass::init_implementor() {
1679 if (is_interface()) {
1680 set_implementor(nullptr);
1681 }
1682 }
1683
1684
1685 void InstanceKlass::process_interfaces() {
1686 // link this class into the implementors list of every interface it implements
1687 for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
1688 assert(local_interfaces()->at(i)->is_klass(), "must be a klass");
1689 InstanceKlass* interf = local_interfaces()->at(i);
1690 assert(interf->is_interface(), "expected interface");
1691 interf->add_implementor(this);
1692 }
1693 }
1694
1695 bool InstanceKlass::can_be_primary_super_slow() const {
1696 if (is_interface())
1697 return false;
1698 else
1699 return Klass::can_be_primary_super_slow();
1700 }
1701
1702 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots,
1703 Array<InstanceKlass*>* transitive_interfaces) {
1704 // The secondaries are the implemented interfaces.
1705 // We need the cast because Array<Klass*> is NOT a supertype of Array<InstanceKlass*>,
1706 // (but it's safe to do here because we won't write into _secondary_supers from this point on).
1707 Array<Klass*>* interfaces = (Array<Klass*>*)(address)transitive_interfaces;
1708 int num_secondaries = num_extra_slots + interfaces->length();
1709 if (num_secondaries == 0) {
1710 // Must share this for correct bootstrapping!
1711 set_secondary_supers(Universe::the_empty_klass_array(), Universe::the_empty_klass_bitmap());
1712 return nullptr;
1713 } else if (num_extra_slots == 0 && interfaces->length() <= 1) {
1714 // We will reuse the transitive interfaces list if we're certain
1715 // it's in hash order.
1716 uintx bitmap = compute_secondary_supers_bitmap(interfaces);
1717 set_secondary_supers(interfaces, bitmap);
1718 return nullptr;
1719 }
1720 // Copy transitive interfaces to a temporary growable array to be constructed
1721 // into the secondary super list with extra slots.
1722 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length());
1723 for (int i = 0; i < interfaces->length(); i++) {
1724 secondaries->push(interfaces->at(i));
1725 }
1726 return secondaries;
1727 }
1728
1729 bool InstanceKlass::implements_interface(Klass* k) const {
1730 if (this == k) return true;
1731 assert(k->is_interface(), "should be an interface class");
1732 for (int i = 0; i < transitive_interfaces()->length(); i++) {
1733 if (transitive_interfaces()->at(i) == k) {
1734 return true;
1735 }
1736 }
1737 return false;
1738 }
1739
1740 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const {
1741 // Verify direct super interface
1742 if (this == k) return true;
1743 assert(k->is_interface(), "should be an interface class");
1744 for (int i = 0; i < local_interfaces()->length(); i++) {
1745 if (local_interfaces()->at(i) == k) {
1746 return true;
1747 }
1748 }
1749 return false;
1750 }
1751
1752 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) {
1753 check_array_allocation_length(length, arrayOopDesc::max_array_length(T_OBJECT), CHECK_NULL);
1754 size_t size = objArrayOopDesc::object_size(length);
1755 ArrayKlass* ak = array_klass(n, CHECK_NULL);
1756 objArrayOop o = (objArrayOop)Universe::heap()->array_allocate(ak, size, length,
1757 /* do_zero */ true, CHECK_NULL);
1758 return o;
1759 }
1760
1761 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
1762 if (TraceFinalizerRegistration) {
1763 tty->print("Registered ");
1764 i->print_value_on(tty);
1765 tty->print_cr(" (" PTR_FORMAT ") as finalizable", p2i(i));
1766 }
1767 instanceHandle h_i(THREAD, i);
1768 // Pass the handle as argument, JavaCalls::call expects oop as jobjects
1769 JavaValue result(T_VOID);
1770 JavaCallArguments args(h_i);
1771 methodHandle mh(THREAD, Universe::finalizer_register_method());
1772 JavaCalls::call(&result, mh, &args, CHECK_NULL);
1773 MANAGEMENT_ONLY(FinalizerService::on_register(h_i(), THREAD);)
1774 return h_i();
1775 }
1776
1777 instanceOop InstanceKlass::allocate_instance(TRAPS) {
1778 assert(!is_abstract() && !is_interface(), "Should not create this object");
1779 size_t size = size_helper(); // Query before forming handle.
1780 return (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL);
1781 }
1782
1783 instanceOop InstanceKlass::allocate_instance(oop java_class, TRAPS) {
1784 Klass* k = java_lang_Class::as_Klass(java_class);
1785 if (k == nullptr) {
1786 ResourceMark rm(THREAD);
1787 THROW_(vmSymbols::java_lang_InstantiationException(), nullptr);
1788 }
1789 InstanceKlass* ik = cast(k);
1790 ik->check_valid_for_instantiation(false, CHECK_NULL);
1791 ik->initialize(CHECK_NULL);
1792 return ik->allocate_instance(THREAD);
1793 }
1794
1795 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) {
1796 return instanceHandle(THREAD, allocate_instance(THREAD));
1797 }
1798
1799 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1800 if (is_interface() || is_abstract()) {
1801 ResourceMark rm(THREAD);
1802 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1803 : vmSymbols::java_lang_InstantiationException(), external_name());
1804 }
1805 if (this == vmClasses::Class_klass()) {
1806 ResourceMark rm(THREAD);
1807 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1808 : vmSymbols::java_lang_IllegalAccessException(), external_name());
1809 }
1810 }
1811
1812 ArrayKlass* InstanceKlass::array_klass(int n, TRAPS) {
1813 // Need load-acquire for lock-free read
1814 if (array_klasses_acquire() == nullptr) {
1815
1816 // Recursively lock array allocation
1817 RecursiveLocker rl(MultiArray_lock, THREAD);
1818
1819 // Check if another thread created the array klass while we were waiting for the lock.
1820 if (array_klasses() == nullptr) {
1821 ObjArrayKlass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this, false, CHECK_NULL);
1822 // use 'release' to pair with lock-free load
1823 release_set_array_klasses(k);
1824 }
1825 }
1826
1827 // array_klasses() will always be set at this point
1828 ArrayKlass* ak = array_klasses();
1829 assert(ak != nullptr, "should be set");
1830 return ak->array_klass(n, THREAD);
1831 }
1832
1833 ArrayKlass* InstanceKlass::array_klass_or_null(int n) {
1834 // Need load-acquire for lock-free read
1835 ArrayKlass* ak = array_klasses_acquire();
1836 if (ak == nullptr) {
1837 return nullptr;
1838 } else {
1839 return ak->array_klass_or_null(n);
1840 }
1841 }
1842
1843 ArrayKlass* InstanceKlass::array_klass(TRAPS) {
1844 return array_klass(1, THREAD);
1845 }
1846
1847 ArrayKlass* InstanceKlass::array_klass_or_null() {
1848 return array_klass_or_null(1);
1849 }
1850
1851 static int call_class_initializer_counter = 0; // for debugging
1852
1853 Method* InstanceKlass::class_initializer() const {
1854 Method* clinit = find_method(
1855 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1856 if (clinit != nullptr && clinit->is_class_initializer()) {
1857 return clinit;
1858 }
1859 return nullptr;
1860 }
1861
1862 void InstanceKlass::call_class_initializer(TRAPS) {
1863 if (ReplayCompiles &&
1864 (ReplaySuppressInitializers == 1 ||
1865 (ReplaySuppressInitializers >= 2 && class_loader() != nullptr))) {
1866 // Hide the existence of the initializer for the purpose of replaying the compile
1867 return;
1868 }
1869
1870 #if INCLUDE_CDS
1871 // This is needed to ensure the consistency of the archived heap objects.
1872 if (has_aot_initialized_mirror() && CDSConfig::is_loading_heap()) {
1873 AOTClassInitializer::call_runtime_setup(THREAD, this);
1874 return;
1875 } else if (has_archived_enum_objs()) {
1876 assert(is_shared(), "must be");
1877 bool initialized = CDSEnumKlass::initialize_enum_klass(this, CHECK);
1878 if (initialized) {
1879 return;
1880 }
1881 }
1882 #endif
1883
1884 methodHandle h_method(THREAD, class_initializer());
1885 assert(!is_initialized(), "we cannot initialize twice");
1886 LogTarget(Info, class, init) lt;
1887 if (lt.is_enabled()) {
1888 ResourceMark rm(THREAD);
1889 LogStream ls(lt);
1890 ls.print("%d Initializing ", call_class_initializer_counter++);
1891 name()->print_value_on(&ls);
1892 ls.print_cr("%s (" PTR_FORMAT ") by thread \"%s\"",
1893 h_method() == nullptr ? "(no method)" : "", p2i(this),
1894 THREAD->name());
1895 }
1896 if (h_method() != nullptr) {
1897 ThreadInClassInitializer ticl(THREAD, this); // Track class being initialized
1898 JavaCallArguments args; // No arguments
1899 JavaValue result(T_VOID);
1900 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1901 }
1902 }
1903
1904 // If a class that implements this interface is initialized, is the JVM required
1905 // to first execute a <clinit> method declared in this interface,
1906 // or (if also_check_supers==true) any of the super types of this interface?
1907 //
1908 // JVMS 5.5. Initialization, step 7: Next, if C is a class rather than
1909 // an interface, then let SC be its superclass and let SI1, ..., SIn
1910 // be all superinterfaces of C (whether direct or indirect) that
1911 // declare at least one non-abstract, non-static method.
1912 //
1913 // So when an interface is initialized, it does not look at its
1914 // supers. But a proper class will ensure that all of its supers have
1915 // run their <clinit> methods, except that it disregards interfaces
1916 // that lack a non-static concrete method (i.e., a default method).
1917 // Therefore, you should probably call this method only when the
1918 // current class is a super of some proper class, not an interface.
1919 bool InstanceKlass::interface_needs_clinit_execution_as_super(bool also_check_supers) const {
1920 assert(is_interface(), "must be");
1921
1922 if (!has_nonstatic_concrete_methods()) {
1923 // quick check: no nonstatic concrete methods are declared by this or any super interfaces
1924 return false;
1925 }
1926
1927 // JVMS 5.5. Initialization
1928 // ...If C is an interface that declares a non-abstract,
1929 // non-static method, the initialization of a class that
1930 // implements C directly or indirectly.
1931 if (declares_nonstatic_concrete_methods() && class_initializer() != nullptr) {
1932 return true;
1933 }
1934 if (also_check_supers) {
1935 Array<InstanceKlass*>* all_ifs = transitive_interfaces();
1936 for (int i = 0; i < all_ifs->length(); ++i) {
1937 InstanceKlass* super_intf = all_ifs->at(i);
1938 if (super_intf->declares_nonstatic_concrete_methods() && super_intf->class_initializer() != nullptr) {
1939 return true;
1940 }
1941 }
1942 }
1943 return false;
1944 }
1945
1946 void InstanceKlass::mask_for(const methodHandle& method, int bci,
1947 InterpreterOopMap* entry_for) {
1948 // Lazily create the _oop_map_cache at first request.
1949 // Load_acquire is needed to safely get instance published with CAS by another thread.
1950 OopMapCache* oop_map_cache = Atomic::load_acquire(&_oop_map_cache);
1951 if (oop_map_cache == nullptr) {
1952 // Try to install new instance atomically.
1953 oop_map_cache = new OopMapCache();
1954 OopMapCache* other = Atomic::cmpxchg(&_oop_map_cache, (OopMapCache*)nullptr, oop_map_cache);
1955 if (other != nullptr) {
1956 // Someone else managed to install before us, ditch local copy and use the existing one.
1957 delete oop_map_cache;
1958 oop_map_cache = other;
1959 }
1960 }
1961 // _oop_map_cache is constant after init; lookup below does its own locking.
1962 oop_map_cache->lookup(method, bci, entry_for);
1963 }
1964
1965
1966 FieldInfo InstanceKlass::field(int index) const {
1967 for (AllFieldStream fs(this); !fs.done(); fs.next()) {
1968 if (fs.index() == index) {
1969 return fs.to_FieldInfo();
1970 }
1971 }
1972 fatal("Field not found");
1973 return FieldInfo();
1974 }
1975
1976 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1977 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1978 Symbol* f_name = fs.name();
1979 Symbol* f_sig = fs.signature();
1980 if (f_name == name && f_sig == sig) {
1981 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1982 return true;
1983 }
1984 }
1985 return false;
1986 }
1987
1988
1989 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1990 const int n = local_interfaces()->length();
1991 for (int i = 0; i < n; i++) {
1992 Klass* intf1 = local_interfaces()->at(i);
1993 assert(intf1->is_interface(), "just checking type");
1994 // search for field in current interface
1995 if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) {
1996 assert(fd->is_static(), "interface field must be static");
1997 return intf1;
1998 }
1999 // search for field in direct superinterfaces
2000 Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd);
2001 if (intf2 != nullptr) return intf2;
2002 }
2003 // otherwise field lookup fails
2004 return nullptr;
2005 }
2006
2007
2008 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
2009 // search order according to newest JVM spec (5.4.3.2, p.167).
2010 // 1) search for field in current klass
2011 if (find_local_field(name, sig, fd)) {
2012 return const_cast<InstanceKlass*>(this);
2013 }
2014 // 2) search for field recursively in direct superinterfaces
2015 { Klass* intf = find_interface_field(name, sig, fd);
2016 if (intf != nullptr) return intf;
2017 }
2018 // 3) apply field lookup recursively if superclass exists
2019 { Klass* supr = super();
2020 if (supr != nullptr) return InstanceKlass::cast(supr)->find_field(name, sig, fd);
2021 }
2022 // 4) otherwise field lookup fails
2023 return nullptr;
2024 }
2025
2026
2027 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
2028 // search order according to newest JVM spec (5.4.3.2, p.167).
2029 // 1) search for field in current klass
2030 if (find_local_field(name, sig, fd)) {
2031 if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
2032 }
2033 // 2) search for field recursively in direct superinterfaces
2034 if (is_static) {
2035 Klass* intf = find_interface_field(name, sig, fd);
2036 if (intf != nullptr) return intf;
2037 }
2038 // 3) apply field lookup recursively if superclass exists
2039 { Klass* supr = super();
2040 if (supr != nullptr) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd);
2041 }
2042 // 4) otherwise field lookup fails
2043 return nullptr;
2044 }
2045
2046 bool InstanceKlass::contains_field_offset(int offset) {
2047 if (this->is_inline_klass()) {
2048 InlineKlass* vk = InlineKlass::cast(this);
2049 return offset >= vk->payload_offset() && offset < (vk->payload_offset() + vk->payload_size_in_bytes());
2050 } else {
2051 fieldDescriptor fd;
2052 return find_field_from_offset(offset, false, &fd);
2053 }
2054 }
2055
2056 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
2057 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
2058 if (fs.offset() == offset) {
2059 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
2060 if (fd->is_static() == is_static) return true;
2061 }
2062 }
2063 return false;
2064 }
2065
2066
2067 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
2068 Klass* klass = const_cast<InstanceKlass*>(this);
2069 while (klass != nullptr) {
2070 if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) {
2071 return true;
2072 }
2073 klass = klass->super();
2074 }
2075 return false;
2076 }
2077
2078
2079 void InstanceKlass::methods_do(void f(Method* method)) {
2080 // Methods aren't stable until they are loaded. This can be read outside
2081 // a lock through the ClassLoaderData for profiling
2082 // Redefined scratch classes are on the list and need to be cleaned
2083 if (!is_loaded() && !is_scratch_class()) {
2084 return;
2085 }
2086
2087 int len = methods()->length();
2088 for (int index = 0; index < len; index++) {
2089 Method* m = methods()->at(index);
2090 assert(m->is_method(), "must be method");
2091 f(m);
2092 }
2093 }
2094
2095
2096 void InstanceKlass::do_local_static_fields(FieldClosure* cl) {
2097 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
2098 if (fs.access_flags().is_static()) {
2099 fieldDescriptor& fd = fs.field_descriptor();
2100 cl->do_field(&fd);
2101 }
2102 }
2103 }
2104
2105
2106 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) {
2107 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
2108 if (fs.access_flags().is_static()) {
2109 fieldDescriptor& fd = fs.field_descriptor();
2110 f(&fd, mirror, CHECK);
2111 }
2112 }
2113 }
2114
2115 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) {
2116 InstanceKlass* super = superklass();
2117 if (super != nullptr) {
2118 super->do_nonstatic_fields(cl);
2119 }
2120 fieldDescriptor fd;
2121 int length = java_fields_count();
2122 for (int i = 0; i < length; i += 1) {
2123 fd.reinitialize(this, i);
2124 if (!fd.is_static()) {
2125 cl->do_field(&fd);
2126 }
2127 }
2128 }
2129
2130 // first in Pair is offset, second is index.
2131 static int compare_fields_by_offset(Pair<int,int>* a, Pair<int,int>* b) {
2132 return a->first - b->first;
2133 }
2134
2135 void InstanceKlass::print_nonstatic_fields(FieldClosure* cl) {
2136 InstanceKlass* super = superklass();
2137 if (super != nullptr) {
2138 super->print_nonstatic_fields(cl);
2139 }
2140 ResourceMark rm;
2141 fieldDescriptor fd;
2142 // In DebugInfo nonstatic fields are sorted by offset.
2143 GrowableArray<Pair<int,int> > fields_sorted;
2144 int i = 0;
2145 for (AllFieldStream fs(this); !fs.done(); fs.next()) {
2146 if (!fs.access_flags().is_static()) {
2147 fd = fs.field_descriptor();
2148 Pair<int,int> f(fs.offset(), fs.index());
2149 fields_sorted.push(f);
2150 i++;
2151 }
2152 }
2153 if (i > 0) {
2154 int length = i;
2155 assert(length == fields_sorted.length(), "duh");
2156 fields_sorted.sort(compare_fields_by_offset);
2157 for (int i = 0; i < length; i++) {
2158 fd.reinitialize(this, fields_sorted.at(i).second);
2159 assert(!fd.is_static() && fd.offset() == fields_sorted.at(i).first, "only nonstatic fields");
2160 cl->do_field(&fd);
2161 }
2162 }
2163 }
2164
2165 #ifdef ASSERT
2166 static int linear_search(const Array<Method*>* methods,
2167 const Symbol* name,
2168 const Symbol* signature) {
2169 const int len = methods->length();
2170 for (int index = 0; index < len; index++) {
2171 const Method* const m = methods->at(index);
2172 assert(m->is_method(), "must be method");
2173 if (m->signature() == signature && m->name() == name) {
2174 return index;
2175 }
2176 }
2177 return -1;
2178 }
2179 #endif
2180
2181 bool InstanceKlass::_disable_method_binary_search = false;
2182
2183 NOINLINE int linear_search(const Array<Method*>* methods, const Symbol* name) {
2184 int len = methods->length();
2185 int l = 0;
2186 int h = len - 1;
2187 while (l <= h) {
2188 Method* m = methods->at(l);
2189 if (m->name() == name) {
2190 return l;
2191 }
2192 l++;
2193 }
2194 return -1;
2195 }
2196
2197 inline int InstanceKlass::quick_search(const Array<Method*>* methods, const Symbol* name) {
2198 if (_disable_method_binary_search) {
2199 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
2200 // At the final stage of dynamic dumping, the methods array may not be sorted
2201 // by ascending addresses of their names, so we can't use binary search anymore.
2202 // However, methods with the same name are still laid out consecutively inside the
2203 // methods array, so let's look for the first one that matches.
2204 return linear_search(methods, name);
2205 }
2206
2207 int len = methods->length();
2208 int l = 0;
2209 int h = len - 1;
2210
2211 // methods are sorted by ascending addresses of their names, so do binary search
2212 while (l <= h) {
2213 int mid = (l + h) >> 1;
2214 Method* m = methods->at(mid);
2215 assert(m->is_method(), "must be method");
2216 int res = m->name()->fast_compare(name);
2217 if (res == 0) {
2218 return mid;
2219 } else if (res < 0) {
2220 l = mid + 1;
2221 } else {
2222 h = mid - 1;
2223 }
2224 }
2225 return -1;
2226 }
2227
2228 // find_method looks up the name/signature in the local methods array
2229 Method* InstanceKlass::find_method(const Symbol* name,
2230 const Symbol* signature) const {
2231 return find_method_impl(name, signature,
2232 OverpassLookupMode::find,
2233 StaticLookupMode::find,
2234 PrivateLookupMode::find);
2235 }
2236
2237 Method* InstanceKlass::find_method_impl(const Symbol* name,
2238 const Symbol* signature,
2239 OverpassLookupMode overpass_mode,
2240 StaticLookupMode static_mode,
2241 PrivateLookupMode private_mode) const {
2242 return InstanceKlass::find_method_impl(methods(),
2243 name,
2244 signature,
2245 overpass_mode,
2246 static_mode,
2247 private_mode);
2248 }
2249
2250 // find_instance_method looks up the name/signature in the local methods array
2251 // and skips over static methods
2252 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods,
2253 const Symbol* name,
2254 const Symbol* signature,
2255 PrivateLookupMode private_mode) {
2256 Method* const meth = InstanceKlass::find_method_impl(methods,
2257 name,
2258 signature,
2259 OverpassLookupMode::find,
2260 StaticLookupMode::skip,
2261 private_mode);
2262 assert(((meth == nullptr) || !meth->is_static()),
2263 "find_instance_method should have skipped statics");
2264 return meth;
2265 }
2266
2267 // find_instance_method looks up the name/signature in the local methods array
2268 // and skips over static methods
2269 Method* InstanceKlass::find_instance_method(const Symbol* name,
2270 const Symbol* signature,
2271 PrivateLookupMode private_mode) const {
2272 return InstanceKlass::find_instance_method(methods(), name, signature, private_mode);
2273 }
2274
2275 // Find looks up the name/signature in the local methods array
2276 // and filters on the overpass, static and private flags
2277 // This returns the first one found
2278 // note that the local methods array can have up to one overpass, one static
2279 // and one instance (private or not) with the same name/signature
2280 Method* InstanceKlass::find_local_method(const Symbol* name,
2281 const Symbol* signature,
2282 OverpassLookupMode overpass_mode,
2283 StaticLookupMode static_mode,
2284 PrivateLookupMode private_mode) const {
2285 return InstanceKlass::find_method_impl(methods(),
2286 name,
2287 signature,
2288 overpass_mode,
2289 static_mode,
2290 private_mode);
2291 }
2292
2293 // Find looks up the name/signature in the local methods array
2294 // and filters on the overpass, static and private flags
2295 // This returns the first one found
2296 // note that the local methods array can have up to one overpass, one static
2297 // and one instance (private or not) with the same name/signature
2298 Method* InstanceKlass::find_local_method(const Array<Method*>* methods,
2299 const Symbol* name,
2300 const Symbol* signature,
2301 OverpassLookupMode overpass_mode,
2302 StaticLookupMode static_mode,
2303 PrivateLookupMode private_mode) {
2304 return InstanceKlass::find_method_impl(methods,
2305 name,
2306 signature,
2307 overpass_mode,
2308 static_mode,
2309 private_mode);
2310 }
2311
2312 Method* InstanceKlass::find_method(const Array<Method*>* methods,
2313 const Symbol* name,
2314 const Symbol* signature) {
2315 return InstanceKlass::find_method_impl(methods,
2316 name,
2317 signature,
2318 OverpassLookupMode::find,
2319 StaticLookupMode::find,
2320 PrivateLookupMode::find);
2321 }
2322
2323 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods,
2324 const Symbol* name,
2325 const Symbol* signature,
2326 OverpassLookupMode overpass_mode,
2327 StaticLookupMode static_mode,
2328 PrivateLookupMode private_mode) {
2329 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode);
2330 return hit >= 0 ? methods->at(hit): nullptr;
2331 }
2332
2333 // true if method matches signature and conforms to skipping_X conditions.
2334 static bool method_matches(const Method* m,
2335 const Symbol* signature,
2336 bool skipping_overpass,
2337 bool skipping_static,
2338 bool skipping_private) {
2339 return ((m->signature() == signature) &&
2340 (!skipping_overpass || !m->is_overpass()) &&
2341 (!skipping_static || !m->is_static()) &&
2342 (!skipping_private || !m->is_private()));
2343 }
2344
2345 // Used directly for default_methods to find the index into the
2346 // default_vtable_indices, and indirectly by find_method
2347 // find_method_index looks in the local methods array to return the index
2348 // of the matching name/signature. If, overpass methods are being ignored,
2349 // the search continues to find a potential non-overpass match. This capability
2350 // is important during method resolution to prefer a static method, for example,
2351 // over an overpass method.
2352 // There is the possibility in any _method's array to have the same name/signature
2353 // for a static method, an overpass method and a local instance method
2354 // To correctly catch a given method, the search criteria may need
2355 // to explicitly skip the other two. For local instance methods, it
2356 // is often necessary to skip private methods
2357 int InstanceKlass::find_method_index(const Array<Method*>* methods,
2358 const Symbol* name,
2359 const Symbol* signature,
2360 OverpassLookupMode overpass_mode,
2361 StaticLookupMode static_mode,
2362 PrivateLookupMode private_mode) {
2363 const bool skipping_overpass = (overpass_mode == OverpassLookupMode::skip);
2364 const bool skipping_static = (static_mode == StaticLookupMode::skip);
2365 const bool skipping_private = (private_mode == PrivateLookupMode::skip);
2366 const int hit = quick_search(methods, name);
2367 if (hit != -1) {
2368 const Method* const m = methods->at(hit);
2369
2370 // Do linear search to find matching signature. First, quick check
2371 // for common case, ignoring overpasses if requested.
2372 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
2373 return hit;
2374 }
2375
2376 // search downwards through overloaded methods
2377 int i;
2378 for (i = hit - 1; i >= 0; --i) {
2379 const Method* const m = methods->at(i);
2380 assert(m->is_method(), "must be method");
2381 if (m->name() != name) {
2382 break;
2383 }
2384 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
2385 return i;
2386 }
2387 }
2388 // search upwards
2389 for (i = hit + 1; i < methods->length(); ++i) {
2390 const Method* const m = methods->at(i);
2391 assert(m->is_method(), "must be method");
2392 if (m->name() != name) {
2393 break;
2394 }
2395 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
2396 return i;
2397 }
2398 }
2399 // not found
2400 #ifdef ASSERT
2401 const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 :
2402 linear_search(methods, name, signature);
2403 assert(-1 == index, "binary search should have found entry %d", index);
2404 #endif
2405 }
2406 return -1;
2407 }
2408
2409 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const {
2410 return find_method_by_name(methods(), name, end);
2411 }
2412
2413 int InstanceKlass::find_method_by_name(const Array<Method*>* methods,
2414 const Symbol* name,
2415 int* end_ptr) {
2416 assert(end_ptr != nullptr, "just checking");
2417 int start = quick_search(methods, name);
2418 int end = start + 1;
2419 if (start != -1) {
2420 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
2421 while (end < methods->length() && (methods->at(end))->name() == name) ++end;
2422 *end_ptr = end;
2423 return start;
2424 }
2425 return -1;
2426 }
2427
2428 // uncached_lookup_method searches both the local class methods array and all
2429 // superclasses methods arrays, skipping any overpass methods in superclasses,
2430 // and possibly skipping private methods.
2431 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
2432 const Symbol* signature,
2433 OverpassLookupMode overpass_mode,
2434 PrivateLookupMode private_mode) const {
2435 OverpassLookupMode overpass_local_mode = overpass_mode;
2436 const Klass* klass = this;
2437 while (klass != nullptr) {
2438 Method* const method = InstanceKlass::cast(klass)->find_method_impl(name,
2439 signature,
2440 overpass_local_mode,
2441 StaticLookupMode::find,
2442 private_mode);
2443 if (method != nullptr) {
2444 return method;
2445 }
2446 if (name == vmSymbols::object_initializer_name()) {
2447 break; // <init> is never inherited
2448 }
2449 klass = klass->super();
2450 overpass_local_mode = OverpassLookupMode::skip; // Always ignore overpass methods in superclasses
2451 }
2452 return nullptr;
2453 }
2454
2455 #ifdef ASSERT
2456 // search through class hierarchy and return true if this class or
2457 // one of the superclasses was redefined
2458 bool InstanceKlass::has_redefined_this_or_super() const {
2459 const Klass* klass = this;
2460 while (klass != nullptr) {
2461 if (InstanceKlass::cast(klass)->has_been_redefined()) {
2462 return true;
2463 }
2464 klass = klass->super();
2465 }
2466 return false;
2467 }
2468 #endif
2469
2470 // lookup a method in the default methods list then in all transitive interfaces
2471 // Do NOT return private or static methods
2472 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
2473 Symbol* signature) const {
2474 Method* m = nullptr;
2475 if (default_methods() != nullptr) {
2476 m = find_method(default_methods(), name, signature);
2477 }
2478 // Look up interfaces
2479 if (m == nullptr) {
2480 m = lookup_method_in_all_interfaces(name, signature, DefaultsLookupMode::find);
2481 }
2482 return m;
2483 }
2484
2485 // lookup a method in all the interfaces that this class implements
2486 // Do NOT return private or static methods, new in JDK8 which are not externally visible
2487 // They should only be found in the initial InterfaceMethodRef
2488 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
2489 Symbol* signature,
2490 DefaultsLookupMode defaults_mode) const {
2491 Array<InstanceKlass*>* all_ifs = transitive_interfaces();
2492 int num_ifs = all_ifs->length();
2493 InstanceKlass *ik = nullptr;
2494 for (int i = 0; i < num_ifs; i++) {
2495 ik = all_ifs->at(i);
2496 Method* m = ik->lookup_method(name, signature);
2497 if (m != nullptr && m->is_public() && !m->is_static() &&
2498 ((defaults_mode != DefaultsLookupMode::skip) || !m->is_default_method())) {
2499 return m;
2500 }
2501 }
2502 return nullptr;
2503 }
2504
2505 PrintClassClosure::PrintClassClosure(outputStream* st, bool verbose)
2506 :_st(st), _verbose(verbose) {
2507 ResourceMark rm;
2508 _st->print("%-18s ", "KlassAddr");
2509 _st->print("%-4s ", "Size");
2510 _st->print("%-20s ", "State");
2511 _st->print("%-7s ", "Flags");
2512 _st->print("%-5s ", "ClassName");
2513 _st->cr();
2514 }
2515
2516 void PrintClassClosure::do_klass(Klass* k) {
2517 ResourceMark rm;
2518 // klass pointer
2519 _st->print(PTR_FORMAT " ", p2i(k));
2520 // klass size
2521 _st->print("%4d ", k->size());
2522 // initialization state
2523 if (k->is_instance_klass()) {
2524 _st->print("%-20s ",InstanceKlass::cast(k)->init_state_name());
2525 } else {
2526 _st->print("%-20s ","");
2527 }
2528 // misc flags(Changes should synced with ClassesDCmd::ClassesDCmd help doc)
2529 char buf[10];
2530 int i = 0;
2531 if (k->has_finalizer()) buf[i++] = 'F';
2532 if (k->is_instance_klass()) {
2533 InstanceKlass* ik = InstanceKlass::cast(k);
2534 if (ik->has_final_method()) buf[i++] = 'f';
2535 if (ik->is_rewritten()) buf[i++] = 'W';
2536 if (ik->is_contended()) buf[i++] = 'C';
2537 if (ik->has_been_redefined()) buf[i++] = 'R';
2538 if (ik->is_shared()) buf[i++] = 'S';
2539 }
2540 buf[i++] = '\0';
2541 _st->print("%-7s ", buf);
2542 // klass name
2543 _st->print("%-5s ", k->external_name());
2544 // end
2545 _st->cr();
2546 if (_verbose) {
2547 k->print_on(_st);
2548 }
2549 }
2550
2551 /* jni_id_for for jfieldIds only */
2552 JNIid* InstanceKlass::jni_id_for(int offset) {
2553 MutexLocker ml(JfieldIdCreation_lock);
2554 JNIid* probe = jni_ids() == nullptr ? nullptr : jni_ids()->find(offset);
2555 if (probe == nullptr) {
2556 // Allocate new static field identifier
2557 probe = new JNIid(this, offset, jni_ids());
2558 set_jni_ids(probe);
2559 }
2560 return probe;
2561 }
2562
2563 u2 InstanceKlass::enclosing_method_data(int offset) const {
2564 const Array<jushort>* const inner_class_list = inner_classes();
2565 if (inner_class_list == nullptr) {
2566 return 0;
2567 }
2568 const int length = inner_class_list->length();
2569 if (length % inner_class_next_offset == 0) {
2570 return 0;
2571 }
2572 const int index = length - enclosing_method_attribute_size;
2573 assert(offset < enclosing_method_attribute_size, "invalid offset");
2574 return inner_class_list->at(index + offset);
2575 }
2576
2577 void InstanceKlass::set_enclosing_method_indices(u2 class_index,
2578 u2 method_index) {
2579 Array<jushort>* inner_class_list = inner_classes();
2580 assert (inner_class_list != nullptr, "_inner_classes list is not set up");
2581 int length = inner_class_list->length();
2582 if (length % inner_class_next_offset == enclosing_method_attribute_size) {
2583 int index = length - enclosing_method_attribute_size;
2584 inner_class_list->at_put(
2585 index + enclosing_method_class_index_offset, class_index);
2586 inner_class_list->at_put(
2587 index + enclosing_method_method_index_offset, method_index);
2588 }
2589 }
2590
2591 jmethodID InstanceKlass::update_jmethod_id(jmethodID* jmeths, Method* method, int idnum) {
2592 if (method->is_old() && !method->is_obsolete()) {
2593 // If the method passed in is old (but not obsolete), use the current version.
2594 method = method_with_idnum((int)idnum);
2595 assert(method != nullptr, "old and but not obsolete, so should exist");
2596 }
2597 jmethodID new_id = Method::make_jmethod_id(class_loader_data(), method);
2598 Atomic::release_store(&jmeths[idnum + 1], new_id);
2599 return new_id;
2600 }
2601
2602 // Lookup or create a jmethodID.
2603 // This code is called by the VMThread and JavaThreads so the
2604 // locking has to be done very carefully to avoid deadlocks
2605 // and/or other cache consistency problems.
2606 //
2607 jmethodID InstanceKlass::get_jmethod_id(const methodHandle& method_h) {
2608 Method* method = method_h();
2609 int idnum = method->method_idnum();
2610 jmethodID* jmeths = methods_jmethod_ids_acquire();
2611
2612 // We use a double-check locking idiom here because this cache is
2613 // performance sensitive. In the normal system, this cache only
2614 // transitions from null to non-null which is safe because we use
2615 // release_set_methods_jmethod_ids() to advertise the new cache.
2616 // A partially constructed cache should never be seen by a racing
2617 // thread. We also use release_store() to save a new jmethodID
2618 // in the cache so a partially constructed jmethodID should never be
2619 // seen either. Cache reads of existing jmethodIDs proceed without a
2620 // lock, but cache writes of a new jmethodID requires uniqueness and
2621 // creation of the cache itself requires no leaks so a lock is
2622 // acquired in those two cases.
2623 //
2624 // If the RedefineClasses() API has been used, then this cache grows
2625 // in the redefinition safepoint.
2626
2627 if (jmeths == nullptr) {
2628 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2629 jmeths = methods_jmethod_ids_acquire();
2630 // Still null?
2631 if (jmeths == nullptr) {
2632 size_t size = idnum_allocated_count();
2633 assert(size > (size_t)idnum, "should already have space");
2634 jmeths = NEW_C_HEAP_ARRAY(jmethodID, size + 1, mtClass);
2635 memset(jmeths, 0, (size + 1) * sizeof(jmethodID));
2636 // cache size is stored in element[0], other elements offset by one
2637 jmeths[0] = (jmethodID)size;
2638 jmethodID new_id = update_jmethod_id(jmeths, method, idnum);
2639
2640 // publish jmeths
2641 release_set_methods_jmethod_ids(jmeths);
2642 return new_id;
2643 }
2644 }
2645
2646 jmethodID id = Atomic::load_acquire(&jmeths[idnum + 1]);
2647 if (id == nullptr) {
2648 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2649 id = jmeths[idnum + 1];
2650 // Still null?
2651 if (id == nullptr) {
2652 return update_jmethod_id(jmeths, method, idnum);
2653 }
2654 }
2655 return id;
2656 }
2657
2658 void InstanceKlass::update_methods_jmethod_cache() {
2659 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
2660 jmethodID* cache = _methods_jmethod_ids;
2661 if (cache != nullptr) {
2662 size_t size = idnum_allocated_count();
2663 size_t old_size = (size_t)cache[0];
2664 if (old_size < size + 1) {
2665 // Allocate a larger one and copy entries to the new one.
2666 // They've already been updated to point to new methods where applicable (i.e., not obsolete).
2667 jmethodID* new_cache = NEW_C_HEAP_ARRAY(jmethodID, size + 1, mtClass);
2668 memset(new_cache, 0, (size + 1) * sizeof(jmethodID));
2669 // The cache size is stored in element[0]; the other elements are offset by one.
2670 new_cache[0] = (jmethodID)size;
2671
2672 for (int i = 1; i <= (int)old_size; i++) {
2673 new_cache[i] = cache[i];
2674 }
2675 _methods_jmethod_ids = new_cache;
2676 FREE_C_HEAP_ARRAY(jmethodID, cache);
2677 }
2678 }
2679 }
2680
2681 // Figure out how many jmethodIDs haven't been allocated, and make
2682 // sure space for them is pre-allocated. This makes getting all
2683 // method ids much, much faster with classes with more than 8
2684 // methods, and has a *substantial* effect on performance with jvmti
2685 // code that loads all jmethodIDs for all classes.
2686 void InstanceKlass::ensure_space_for_methodids(int start_offset) {
2687 int new_jmeths = 0;
2688 int length = methods()->length();
2689 for (int index = start_offset; index < length; index++) {
2690 Method* m = methods()->at(index);
2691 jmethodID id = m->find_jmethod_id_or_null();
2692 if (id == nullptr) {
2693 new_jmeths++;
2694 }
2695 }
2696 if (new_jmeths != 0) {
2697 Method::ensure_jmethod_ids(class_loader_data(), new_jmeths);
2698 }
2699 }
2700
2701 // Lookup a jmethodID, null if not found. Do no blocking, no allocations, no handles
2702 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
2703 int idnum = method->method_idnum();
2704 jmethodID* jmeths = methods_jmethod_ids_acquire();
2705 return (jmeths != nullptr) ? jmeths[idnum + 1] : nullptr;
2706 }
2707
2708 inline DependencyContext InstanceKlass::dependencies() {
2709 DependencyContext dep_context(&_dep_context, &_dep_context_last_cleaned);
2710 return dep_context;
2711 }
2712
2713 void InstanceKlass::mark_dependent_nmethods(DeoptimizationScope* deopt_scope, KlassDepChange& changes) {
2714 dependencies().mark_dependent_nmethods(deopt_scope, changes);
2715 }
2716
2717 void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
2718 dependencies().add_dependent_nmethod(nm);
2719 }
2720
2721 void InstanceKlass::clean_dependency_context() {
2722 dependencies().clean_unloading_dependents();
2723 }
2724
2725 #ifndef PRODUCT
2726 void InstanceKlass::print_dependent_nmethods(bool verbose) {
2727 dependencies().print_dependent_nmethods(verbose);
2728 }
2729
2730 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
2731 return dependencies().is_dependent_nmethod(nm);
2732 }
2733 #endif //PRODUCT
2734
2735 void InstanceKlass::clean_weak_instanceklass_links() {
2736 clean_implementors_list();
2737 clean_method_data();
2738 }
2739
2740 void InstanceKlass::clean_implementors_list() {
2741 assert(is_loader_alive(), "this klass should be live");
2742 if (is_interface()) {
2743 assert (ClassUnloading, "only called for ClassUnloading");
2744 for (;;) {
2745 // Use load_acquire due to competing with inserts
2746 InstanceKlass* volatile* iklass = adr_implementor();
2747 assert(iklass != nullptr, "Klass must not be null");
2748 InstanceKlass* impl = Atomic::load_acquire(iklass);
2749 if (impl != nullptr && !impl->is_loader_alive()) {
2750 // null this field, might be an unloaded instance klass or null
2751 if (Atomic::cmpxchg(iklass, impl, (InstanceKlass*)nullptr) == impl) {
2752 // Successfully unlinking implementor.
2753 if (log_is_enabled(Trace, class, unload)) {
2754 ResourceMark rm;
2755 log_trace(class, unload)("unlinking class (implementor): %s", impl->external_name());
2756 }
2757 return;
2758 }
2759 } else {
2760 return;
2761 }
2762 }
2763 }
2764 }
2765
2766 void InstanceKlass::clean_method_data() {
2767 for (int m = 0; m < methods()->length(); m++) {
2768 MethodData* mdo = methods()->at(m)->method_data();
2769 if (mdo != nullptr) {
2770 mdo->clean_method_data(/*always_clean*/false);
2771 }
2772 }
2773 }
2774
2775 void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) {
2776 Klass::metaspace_pointers_do(it);
2777
2778 if (log_is_enabled(Trace, cds)) {
2779 ResourceMark rm;
2780 log_trace(cds)("Iter(InstanceKlass): %p (%s)", this, external_name());
2781 }
2782
2783 it->push(&_annotations);
2784 it->push((Klass**)&_array_klasses);
2785 if (!is_rewritten()) {
2786 it->push(&_constants, MetaspaceClosure::_writable);
2787 } else {
2788 it->push(&_constants);
2789 }
2790 it->push(&_inner_classes);
2791 #if INCLUDE_JVMTI
2792 it->push(&_previous_versions);
2793 #endif
2794 #if INCLUDE_CDS
2795 // For "old" classes with methods containing the jsr bytecode, the _methods array will
2796 // be rewritten during runtime (see Rewriter::rewrite_jsrs()) but they cannot be safely
2797 // checked here with ByteCodeStream. All methods that can't be verified are made writable.
2798 // The length check on the _methods is necessary because classes which don't have any
2799 // methods share the Universe::_the_empty_method_array which is in the RO region.
2800 if (_methods != nullptr && _methods->length() > 0 && !can_be_verified_at_dumptime()) {
2801 // To handle jsr bytecode, new Method* maybe stored into _methods
2802 it->push(&_methods, MetaspaceClosure::_writable);
2803 } else {
2804 #endif
2805 it->push(&_methods);
2806 #if INCLUDE_CDS
2807 }
2808 #endif
2809 it->push(&_default_methods);
2810 it->push(&_local_interfaces);
2811 it->push(&_transitive_interfaces);
2812 it->push(&_method_ordering);
2813 if (!is_rewritten()) {
2814 it->push(&_default_vtable_indices, MetaspaceClosure::_writable);
2815 } else {
2816 it->push(&_default_vtable_indices);
2817 }
2818
2819 it->push(&_fieldinfo_stream);
2820 // _fields_status might be written into by Rewriter::scan_method() -> fd.set_has_initialized_final_update()
2821 it->push(&_fields_status, MetaspaceClosure::_writable);
2822
2823 if (itable_length() > 0) {
2824 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2825 int method_table_offset_in_words = ioe->offset()/wordSize;
2826 int itable_offset_in_words = (int)(start_of_itable() - (intptr_t*)this);
2827
2828 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words)
2829 / itableOffsetEntry::size();
2830
2831 for (int i = 0; i < nof_interfaces; i ++, ioe ++) {
2832 if (ioe->interface_klass() != nullptr) {
2833 it->push(ioe->interface_klass_addr());
2834 itableMethodEntry* ime = ioe->first_method_entry(this);
2835 int n = klassItable::method_count_for_interface(ioe->interface_klass());
2836 for (int index = 0; index < n; index ++) {
2837 it->push(ime[index].method_addr());
2838 }
2839 }
2840 }
2841 }
2842
2843 it->push(&_nest_host);
2844 it->push(&_nest_members);
2845 it->push(&_permitted_subclasses);
2846 it->push(&_loadable_descriptors);
2847 it->push(&_record_components);
2848 it->push(&_inline_layout_info_array, MetaspaceClosure::_writable);
2849 }
2850
2851 #if INCLUDE_CDS
2852 void InstanceKlass::remove_unshareable_info() {
2853
2854 if (is_linked()) {
2855 assert(can_be_verified_at_dumptime(), "must be");
2856 // Remember this so we can avoid walking the hierarchy at runtime.
2857 set_verified_at_dump_time();
2858 }
2859
2860 Klass::remove_unshareable_info();
2861
2862 if (SystemDictionaryShared::has_class_failed_verification(this)) {
2863 // Classes are attempted to link during dumping and may fail,
2864 // but these classes are still in the dictionary and class list in CLD.
2865 // If the class has failed verification, there is nothing else to remove.
2866 return;
2867 }
2868
2869 // Reset to the 'allocated' state to prevent any premature accessing to
2870 // a shared class at runtime while the class is still being loaded and
2871 // restored. A class' init_state is set to 'loaded' at runtime when it's
2872 // being added to class hierarchy (see InstanceKlass:::add_to_hierarchy()).
2873 _init_state = allocated;
2874
2875 { // Otherwise this needs to take out the Compile_lock.
2876 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
2877 init_implementor();
2878 }
2879
2880 // Call remove_unshareable_info() on other objects that belong to this class, except
2881 // for constants()->remove_unshareable_info(), which is called in a separate pass in
2882 // ArchiveBuilder::make_klasses_shareable(),
2883
2884 for (int i = 0; i < methods()->length(); i++) {
2885 Method* m = methods()->at(i);
2886 m->remove_unshareable_info();
2887 }
2888
2889 // do array classes also.
2890 if (array_klasses() != nullptr) {
2891 array_klasses()->remove_unshareable_info();
2892 }
2893
2894 // These are not allocated from metaspace. They are safe to set to nullptr.
2895 _source_debug_extension = nullptr;
2896 _dep_context = nullptr;
2897 _osr_nmethods_head = nullptr;
2898 #if INCLUDE_JVMTI
2899 _breakpoints = nullptr;
2900 _previous_versions = nullptr;
2901 _cached_class_file = nullptr;
2902 _jvmti_cached_class_field_map = nullptr;
2903 #endif
2904
2905 _init_thread = nullptr;
2906 _methods_jmethod_ids = nullptr;
2907 _jni_ids = nullptr;
2908 _oop_map_cache = nullptr;
2909 if (CDSConfig::is_dumping_method_handles() && HeapShared::is_lambda_proxy_klass(this)) {
2910 // keep _nest_host
2911 } else {
2912 // clear _nest_host to ensure re-load at runtime
2913 _nest_host = nullptr;
2914 }
2915 init_shared_package_entry();
2916 _dep_context_last_cleaned = 0;
2917 DEBUG_ONLY(_shared_class_load_count = 0);
2918
2919 remove_unshareable_flags();
2920 }
2921
2922 void InstanceKlass::remove_unshareable_flags() {
2923 // clear all the flags/stats that shouldn't be in the archived version
2924 assert(!is_scratch_class(), "must be");
2925 assert(!has_been_redefined(), "must be");
2926 #if INCLUDE_JVMTI
2927 set_is_being_redefined(false);
2928 #endif
2929 set_has_resolved_methods(false);
2930 }
2931
2932 void InstanceKlass::remove_java_mirror() {
2933 Klass::remove_java_mirror();
2934
2935 // do array classes also.
2936 if (array_klasses() != nullptr) {
2937 array_klasses()->remove_java_mirror();
2938 }
2939 }
2940
2941 void InstanceKlass::init_shared_package_entry() {
2942 assert(CDSConfig::is_dumping_archive(), "must be");
2943 #if !INCLUDE_CDS_JAVA_HEAP
2944 _package_entry = nullptr;
2945 #else
2946 if (CDSConfig::is_dumping_full_module_graph()) {
2947 if (is_shared_unregistered_class()) {
2948 _package_entry = nullptr;
2949 } else {
2950 _package_entry = PackageEntry::get_archived_entry(_package_entry);
2951 }
2952 } else if (CDSConfig::is_dumping_dynamic_archive() &&
2953 CDSConfig::is_using_full_module_graph() &&
2954 MetaspaceShared::is_in_shared_metaspace(_package_entry)) {
2955 // _package_entry is an archived package in the base archive. Leave it as is.
2956 } else {
2957 _package_entry = nullptr;
2958 }
2959 ArchivePtrMarker::mark_pointer((address**)&_package_entry);
2960 #endif
2961 }
2962
2963 void InstanceKlass::compute_has_loops_flag_for_methods() {
2964 Array<Method*>* methods = this->methods();
2965 for (int index = 0; index < methods->length(); ++index) {
2966 Method* m = methods->at(index);
2967 if (!m->is_overpass()) { // work around JDK-8305771
2968 m->compute_has_loops_flag();
2969 }
2970 }
2971 }
2972
2973 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain,
2974 PackageEntry* pkg_entry, TRAPS) {
2975 // InstanceKlass::add_to_hierarchy() sets the init_state to loaded
2976 // before the InstanceKlass is added to the SystemDictionary. Make
2977 // sure the current state is <loaded.
2978 assert(!is_loaded(), "invalid init state");
2979 assert(!shared_loading_failed(), "Must not try to load failed class again");
2980 set_package(loader_data, pkg_entry, CHECK);
2981 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
2982
2983 if (is_inline_klass()) {
2984 InlineKlass::cast(this)->initialize_calling_convention(CHECK);
2985 }
2986
2987 Array<Method*>* methods = this->methods();
2988 int num_methods = methods->length();
2989 for (int index = 0; index < num_methods; ++index) {
2990 methods->at(index)->restore_unshareable_info(CHECK);
2991 }
2992 #if INCLUDE_JVMTI
2993 if (JvmtiExport::has_redefined_a_class()) {
2994 // Reinitialize vtable because RedefineClasses may have changed some
2995 // entries in this vtable for super classes so the CDS vtable might
2996 // point to old or obsolete entries. RedefineClasses doesn't fix up
2997 // vtables in the shared system dictionary, only the main one.
2998 // It also redefines the itable too so fix that too.
2999 // First fix any default methods that point to a super class that may
3000 // have been redefined.
3001 bool trace_name_printed = false;
3002 adjust_default_methods(&trace_name_printed);
3003 if (verified_at_dump_time()) {
3004 // Initialize vtable and itable for classes which can be verified at dump time.
3005 // Unlinked classes such as old classes with major version < 50 cannot be verified
3006 // at dump time.
3007 vtable().initialize_vtable();
3008 itable().initialize_itable();
3009 }
3010 }
3011 #endif // INCLUDE_JVMTI
3012
3013 // restore constant pool resolved references
3014 constants()->restore_unshareable_info(CHECK);
3015
3016 if (array_klasses() != nullptr) {
3017 // To get a consistent list of classes we need MultiArray_lock to ensure
3018 // array classes aren't observed while they are being restored.
3019 RecursiveLocker rl(MultiArray_lock, THREAD);
3020 assert(this == ObjArrayKlass::cast(array_klasses())->bottom_klass(), "sanity");
3021 // Array classes have null protection domain.
3022 // --> see ArrayKlass::complete_create_array_klass()
3023 array_klasses()->restore_unshareable_info(class_loader_data(), Handle(), CHECK);
3024 }
3025
3026 // Initialize @ValueBased class annotation if not already set in the archived klass.
3027 if (DiagnoseSyncOnValueBasedClasses && has_value_based_class_annotation() && !is_value_based()) {
3028 set_is_value_based();
3029 }
3030 }
3031
3032 // Check if a class or any of its supertypes has a version older than 50.
3033 // CDS will not perform verification of old classes during dump time because
3034 // without changing the old verifier, the verification constraint cannot be
3035 // retrieved during dump time.
3036 // Verification of archived old classes will be performed during run time.
3037 bool InstanceKlass::can_be_verified_at_dumptime() const {
3038 if (MetaspaceShared::is_in_shared_metaspace(this)) {
3039 // This is a class that was dumped into the base archive, so we know
3040 // it was verified at dump time.
3041 return true;
3042 }
3043 if (major_version() < 50 /*JAVA_6_VERSION*/) {
3044 return false;
3045 }
3046 if (java_super() != nullptr && !java_super()->can_be_verified_at_dumptime()) {
3047 return false;
3048 }
3049 Array<InstanceKlass*>* interfaces = local_interfaces();
3050 int len = interfaces->length();
3051 for (int i = 0; i < len; i++) {
3052 if (!interfaces->at(i)->can_be_verified_at_dumptime()) {
3053 return false;
3054 }
3055 }
3056 return true;
3057 }
3058
3059 int InstanceKlass::shared_class_loader_type() const {
3060 if (is_shared_boot_class()) {
3061 return ClassLoader::BOOT_LOADER;
3062 } else if (is_shared_platform_class()) {
3063 return ClassLoader::PLATFORM_LOADER;
3064 } else if (is_shared_app_class()) {
3065 return ClassLoader::APP_LOADER;
3066 } else {
3067 return ClassLoader::OTHER;
3068 }
3069 }
3070 #endif // INCLUDE_CDS
3071
3072 #if INCLUDE_JVMTI
3073 static void clear_all_breakpoints(Method* m) {
3074 m->clear_all_breakpoints();
3075 }
3076 #endif
3077
3078 void InstanceKlass::unload_class(InstanceKlass* ik) {
3079
3080 if (ik->is_scratch_class()) {
3081 assert(ik->dependencies().is_empty(), "dependencies should be empty for scratch classes");
3082 return;
3083 }
3084 assert(ik->is_loaded(), "class should be loaded " PTR_FORMAT, p2i(ik));
3085
3086 // Release dependencies.
3087 ik->dependencies().remove_all_dependents();
3088
3089 // notify the debugger
3090 if (JvmtiExport::should_post_class_unload()) {
3091 JvmtiExport::post_class_unload(ik);
3092 }
3093
3094 // notify ClassLoadingService of class unload
3095 ClassLoadingService::notify_class_unloaded(ik);
3096
3097 SystemDictionaryShared::handle_class_unloading(ik);
3098
3099 if (log_is_enabled(Info, class, unload)) {
3100 ResourceMark rm;
3101 log_info(class, unload)("unloading class %s " PTR_FORMAT, ik->external_name(), p2i(ik));
3102 }
3103
3104 Events::log_class_unloading(Thread::current(), ik);
3105
3106 #if INCLUDE_JFR
3107 assert(ik != nullptr, "invariant");
3108 EventClassUnload event;
3109 event.set_unloadedClass(ik);
3110 event.set_definingClassLoader(ik->class_loader_data());
3111 event.commit();
3112 #endif
3113 }
3114
3115 static void method_release_C_heap_structures(Method* m) {
3116 m->release_C_heap_structures();
3117 }
3118
3119 // Called also by InstanceKlass::deallocate_contents, with false for release_sub_metadata.
3120 void InstanceKlass::release_C_heap_structures(bool release_sub_metadata) {
3121 // Clean up C heap
3122 Klass::release_C_heap_structures();
3123
3124 // Deallocate and call destructors for MDO mutexes
3125 if (release_sub_metadata) {
3126 methods_do(method_release_C_heap_structures);
3127 }
3128
3129 // Deallocate oop map cache
3130 if (_oop_map_cache != nullptr) {
3131 delete _oop_map_cache;
3132 _oop_map_cache = nullptr;
3133 }
3134
3135 // Deallocate JNI identifiers for jfieldIDs
3136 JNIid::deallocate(jni_ids());
3137 set_jni_ids(nullptr);
3138
3139 jmethodID* jmeths = methods_jmethod_ids_acquire();
3140 if (jmeths != nullptr) {
3141 release_set_methods_jmethod_ids(nullptr);
3142 FreeHeap(jmeths);
3143 }
3144
3145 assert(_dep_context == nullptr,
3146 "dependencies should already be cleaned");
3147
3148 #if INCLUDE_JVMTI
3149 // Deallocate breakpoint records
3150 if (breakpoints() != nullptr) {
3151 methods_do(clear_all_breakpoints);
3152 assert(breakpoints() == nullptr, "should have cleared breakpoints");
3153 }
3154
3155 // deallocate the cached class file
3156 if (_cached_class_file != nullptr) {
3157 os::free(_cached_class_file);
3158 _cached_class_file = nullptr;
3159 }
3160 #endif
3161
3162 FREE_C_HEAP_ARRAY(char, _source_debug_extension);
3163
3164 if (release_sub_metadata) {
3165 constants()->release_C_heap_structures();
3166 }
3167 }
3168
3169 // The constant pool is on stack if any of the methods are executing or
3170 // referenced by handles.
3171 bool InstanceKlass::on_stack() const {
3172 return _constants->on_stack();
3173 }
3174
3175 Symbol* InstanceKlass::source_file_name() const { return _constants->source_file_name(); }
3176 u2 InstanceKlass::source_file_name_index() const { return _constants->source_file_name_index(); }
3177 void InstanceKlass::set_source_file_name_index(u2 sourcefile_index) { _constants->set_source_file_name_index(sourcefile_index); }
3178
3179 // minor and major version numbers of class file
3180 u2 InstanceKlass::minor_version() const { return _constants->minor_version(); }
3181 void InstanceKlass::set_minor_version(u2 minor_version) { _constants->set_minor_version(minor_version); }
3182 u2 InstanceKlass::major_version() const { return _constants->major_version(); }
3183 void InstanceKlass::set_major_version(u2 major_version) { _constants->set_major_version(major_version); }
3184
3185 InstanceKlass* InstanceKlass::get_klass_version(int version) {
3186 for (InstanceKlass* ik = this; ik != nullptr; ik = ik->previous_versions()) {
3187 if (ik->constants()->version() == version) {
3188 return ik;
3189 }
3190 }
3191 return nullptr;
3192 }
3193
3194 void InstanceKlass::set_source_debug_extension(const char* array, int length) {
3195 if (array == nullptr) {
3196 _source_debug_extension = nullptr;
3197 } else {
3198 // Adding one to the attribute length in order to store a null terminator
3199 // character could cause an overflow because the attribute length is
3200 // already coded with an u4 in the classfile, but in practice, it's
3201 // unlikely to happen.
3202 assert((length+1) > length, "Overflow checking");
3203 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
3204 for (int i = 0; i < length; i++) {
3205 sde[i] = array[i];
3206 }
3207 sde[length] = '\0';
3208 _source_debug_extension = sde;
3209 }
3210 }
3211
3212 Symbol* InstanceKlass::generic_signature() const { return _constants->generic_signature(); }
3213 u2 InstanceKlass::generic_signature_index() const { return _constants->generic_signature_index(); }
3214 void InstanceKlass::set_generic_signature_index(u2 sig_index) { _constants->set_generic_signature_index(sig_index); }
3215
3216 const char* InstanceKlass::signature_name() const {
3217 return signature_name_of_carrier(JVM_SIGNATURE_CLASS);
3218 }
3219
3220 const char* InstanceKlass::signature_name_of_carrier(char c) const {
3221 // Get the internal name as a c string
3222 const char* src = (const char*) (name()->as_C_string());
3223 const int src_length = (int)strlen(src);
3224
3225 char* dest = NEW_RESOURCE_ARRAY(char, src_length + 3);
3226
3227 // Add L or Q as type indicator
3228 int dest_index = 0;
3229 dest[dest_index++] = c;
3230
3231 // Add the actual class name
3232 for (int src_index = 0; src_index < src_length; ) {
3233 dest[dest_index++] = src[src_index++];
3234 }
3235
3236 if (is_hidden()) { // Replace the last '+' with a '.'.
3237 for (int index = (int)src_length; index > 0; index--) {
3238 if (dest[index] == '+') {
3239 dest[index] = JVM_SIGNATURE_DOT;
3240 break;
3241 }
3242 }
3243 }
3244
3245 // Add the semicolon and the null
3246 dest[dest_index++] = JVM_SIGNATURE_ENDCLASS;
3247 dest[dest_index] = '\0';
3248 return dest;
3249 }
3250
3251 ModuleEntry* InstanceKlass::module() const {
3252 if (is_hidden() &&
3253 in_unnamed_package() &&
3254 class_loader_data()->has_class_mirror_holder()) {
3255 // For a non-strong hidden class defined to an unnamed package,
3256 // its (class held) CLD will not have an unnamed module created for it.
3257 // Two choices to find the correct ModuleEntry:
3258 // 1. If hidden class is within a nest, use nest host's module
3259 // 2. Find the unnamed module off from the class loader
3260 // For now option #2 is used since a nest host is not set until
3261 // after the instance class is created in jvm_lookup_define_class().
3262 if (class_loader_data()->is_boot_class_loader_data()) {
3263 return ClassLoaderData::the_null_class_loader_data()->unnamed_module();
3264 } else {
3265 oop module = java_lang_ClassLoader::unnamedModule(class_loader_data()->class_loader());
3266 assert(java_lang_Module::is_instance(module), "Not an instance of java.lang.Module");
3267 return java_lang_Module::module_entry(module);
3268 }
3269 }
3270
3271 // Class is in a named package
3272 if (!in_unnamed_package()) {
3273 return _package_entry->module();
3274 }
3275
3276 // Class is in an unnamed package, return its loader's unnamed module
3277 return class_loader_data()->unnamed_module();
3278 }
3279
3280 bool InstanceKlass::in_javabase_module() const {
3281 return module()->name() == vmSymbols::java_base();
3282 }
3283
3284 void InstanceKlass::set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS) {
3285
3286 // ensure java/ packages only loaded by boot or platform builtin loaders
3287 // not needed for shared class since CDS does not archive prohibited classes.
3288 if (!is_shared()) {
3289 check_prohibited_package(name(), loader_data, CHECK);
3290 }
3291
3292 if (is_shared() && _package_entry != nullptr) {
3293 if (CDSConfig::is_using_full_module_graph() && _package_entry == pkg_entry) {
3294 // we can use the saved package
3295 assert(MetaspaceShared::is_in_shared_metaspace(_package_entry), "must be");
3296 return;
3297 } else {
3298 _package_entry = nullptr;
3299 }
3300 }
3301
3302 // ClassLoader::package_from_class_name has already incremented the refcount of the symbol
3303 // it returns, so we need to decrement it when the current function exits.
3304 TempNewSymbol from_class_name =
3305 (pkg_entry != nullptr) ? nullptr : ClassLoader::package_from_class_name(name());
3306
3307 Symbol* pkg_name;
3308 if (pkg_entry != nullptr) {
3309 pkg_name = pkg_entry->name();
3310 } else {
3311 pkg_name = from_class_name;
3312 }
3313
3314 if (pkg_name != nullptr && loader_data != nullptr) {
3315
3316 // Find in class loader's package entry table.
3317 _package_entry = pkg_entry != nullptr ? pkg_entry : loader_data->packages()->lookup_only(pkg_name);
3318
3319 // If the package name is not found in the loader's package
3320 // entry table, it is an indication that the package has not
3321 // been defined. Consider it defined within the unnamed module.
3322 if (_package_entry == nullptr) {
3323
3324 if (!ModuleEntryTable::javabase_defined()) {
3325 // Before java.base is defined during bootstrapping, define all packages in
3326 // the java.base module. If a non-java.base package is erroneously placed
3327 // in the java.base module it will be caught later when java.base
3328 // is defined by ModuleEntryTable::verify_javabase_packages check.
3329 assert(ModuleEntryTable::javabase_moduleEntry() != nullptr, JAVA_BASE_NAME " module is null");
3330 _package_entry = loader_data->packages()->create_entry_if_absent(pkg_name, ModuleEntryTable::javabase_moduleEntry());
3331 } else {
3332 assert(loader_data->unnamed_module() != nullptr, "unnamed module is null");
3333 _package_entry = loader_data->packages()->create_entry_if_absent(pkg_name, loader_data->unnamed_module());
3334 }
3335
3336 // A package should have been successfully created
3337 DEBUG_ONLY(ResourceMark rm(THREAD));
3338 assert(_package_entry != nullptr, "Package entry for class %s not found, loader %s",
3339 name()->as_C_string(), loader_data->loader_name_and_id());
3340 }
3341
3342 if (log_is_enabled(Debug, module)) {
3343 ResourceMark rm(THREAD);
3344 ModuleEntry* m = _package_entry->module();
3345 log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s",
3346 external_name(),
3347 pkg_name->as_C_string(),
3348 loader_data->loader_name_and_id(),
3349 (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE));
3350 }
3351 } else {
3352 ResourceMark rm(THREAD);
3353 log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s",
3354 external_name(),
3355 (loader_data != nullptr) ? loader_data->loader_name_and_id() : "null",
3356 UNNAMED_MODULE);
3357 }
3358 }
3359
3360 // Function set_classpath_index ensures that for a non-null _package_entry
3361 // of the InstanceKlass, the entry is in the boot loader's package entry table.
3362 // It then sets the classpath_index in the package entry record.
3363 //
3364 // The classpath_index field is used to find the entry on the boot loader class
3365 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
3366 // in an unnamed module. It is also used to indicate (for all packages whose
3367 // classes are loaded by the boot loader) that at least one of the package's
3368 // classes has been loaded.
3369 void InstanceKlass::set_classpath_index(s2 path_index) {
3370 if (_package_entry != nullptr) {
3371 DEBUG_ONLY(PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();)
3372 assert(pkg_entry_tbl->lookup_only(_package_entry->name()) == _package_entry, "Should be same");
3373 assert(path_index != -1, "Unexpected classpath_index");
3374 _package_entry->set_classpath_index(path_index);
3375 }
3376 }
3377
3378 // different versions of is_same_class_package
3379
3380 bool InstanceKlass::is_same_class_package(const Klass* class2) const {
3381 oop classloader1 = this->class_loader();
3382 PackageEntry* classpkg1 = this->package();
3383 if (class2->is_objArray_klass()) {
3384 class2 = ObjArrayKlass::cast(class2)->bottom_klass();
3385 }
3386
3387 oop classloader2;
3388 PackageEntry* classpkg2;
3389 if (class2->is_instance_klass()) {
3390 classloader2 = class2->class_loader();
3391 classpkg2 = class2->package();
3392 } else {
3393 assert(class2->is_typeArray_klass(), "should be type array");
3394 classloader2 = nullptr;
3395 classpkg2 = nullptr;
3396 }
3397
3398 // Same package is determined by comparing class loader
3399 // and package entries. Both must be the same. This rule
3400 // applies even to classes that are defined in the unnamed
3401 // package, they still must have the same class loader.
3402 if ((classloader1 == classloader2) && (classpkg1 == classpkg2)) {
3403 return true;
3404 }
3405
3406 return false;
3407 }
3408
3409 // return true if this class and other_class are in the same package. Classloader
3410 // and classname information is enough to determine a class's package
3411 bool InstanceKlass::is_same_class_package(oop other_class_loader,
3412 const Symbol* other_class_name) const {
3413 if (class_loader() != other_class_loader) {
3414 return false;
3415 }
3416 if (name()->fast_compare(other_class_name) == 0) {
3417 return true;
3418 }
3419
3420 {
3421 ResourceMark rm;
3422
3423 bool bad_class_name = false;
3424 TempNewSymbol other_pkg = ClassLoader::package_from_class_name(other_class_name, &bad_class_name);
3425 if (bad_class_name) {
3426 return false;
3427 }
3428 // Check that package_from_class_name() returns null, not "", if there is no package.
3429 assert(other_pkg == nullptr || other_pkg->utf8_length() > 0, "package name is empty string");
3430
3431 const Symbol* const this_package_name =
3432 this->package() != nullptr ? this->package()->name() : nullptr;
3433
3434 if (this_package_name == nullptr || other_pkg == nullptr) {
3435 // One of the two doesn't have a package. Only return true if the other
3436 // one also doesn't have a package.
3437 return this_package_name == other_pkg;
3438 }
3439
3440 // Check if package is identical
3441 return this_package_name->fast_compare(other_pkg) == 0;
3442 }
3443 }
3444
3445 static bool is_prohibited_package_slow(Symbol* class_name) {
3446 // Caller has ResourceMark
3447 int length;
3448 jchar* unicode = class_name->as_unicode(length);
3449 return (length >= 5 &&
3450 unicode[0] == 'j' &&
3451 unicode[1] == 'a' &&
3452 unicode[2] == 'v' &&
3453 unicode[3] == 'a' &&
3454 unicode[4] == '/');
3455 }
3456
3457 // Only boot and platform class loaders can define classes in "java/" packages.
3458 void InstanceKlass::check_prohibited_package(Symbol* class_name,
3459 ClassLoaderData* loader_data,
3460 TRAPS) {
3461 if (!loader_data->is_boot_class_loader_data() &&
3462 !loader_data->is_platform_class_loader_data() &&
3463 class_name != nullptr && class_name->utf8_length() >= 5) {
3464 ResourceMark rm(THREAD);
3465 bool prohibited;
3466 const u1* base = class_name->base();
3467 if ((base[0] | base[1] | base[2] | base[3] | base[4]) & 0x80) {
3468 prohibited = is_prohibited_package_slow(class_name);
3469 } else {
3470 char* name = class_name->as_C_string();
3471 prohibited = (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/');
3472 }
3473 if (prohibited) {
3474 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name);
3475 assert(pkg_name != nullptr, "Error in parsing package name starting with 'java/'");
3476 char* name = pkg_name->as_C_string();
3477 const char* class_loader_name = loader_data->loader_name_and_id();
3478 StringUtils::replace_no_expand(name, "/", ".");
3479 const char* msg_text1 = "Class loader (instance of): ";
3480 const char* msg_text2 = " tried to load prohibited package name: ";
3481 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1;
3482 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
3483 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name);
3484 THROW_MSG(vmSymbols::java_lang_SecurityException(), message);
3485 }
3486 }
3487 return;
3488 }
3489
3490 bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const {
3491 constantPoolHandle i_cp(THREAD, constants());
3492 for (InnerClassesIterator iter(this); !iter.done(); iter.next()) {
3493 int ioff = iter.inner_class_info_index();
3494 if (ioff != 0) {
3495 // Check to see if the name matches the class we're looking for
3496 // before attempting to find the class.
3497 if (i_cp->klass_name_at_matches(this, ioff)) {
3498 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false);
3499 if (this == inner_klass) {
3500 *ooff = iter.outer_class_info_index();
3501 *noff = iter.inner_name_index();
3502 return true;
3503 }
3504 }
3505 }
3506 }
3507 return false;
3508 }
3509
3510 InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const {
3511 InstanceKlass* outer_klass = nullptr;
3512 *inner_is_member = false;
3513 int ooff = 0, noff = 0;
3514 bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD);
3515 if (has_inner_classes_attr) {
3516 constantPoolHandle i_cp(THREAD, constants());
3517 if (ooff != 0) {
3518 Klass* ok = i_cp->klass_at(ooff, CHECK_NULL);
3519 if (!ok->is_instance_klass()) {
3520 // If the outer class is not an instance klass then it cannot have
3521 // declared any inner classes.
3522 ResourceMark rm(THREAD);
3523 // Names are all known to be < 64k so we know this formatted message is not excessively large.
3524 Exceptions::fthrow(
3525 THREAD_AND_LOCATION,
3526 vmSymbols::java_lang_IncompatibleClassChangeError(),
3527 "%s and %s disagree on InnerClasses attribute",
3528 ok->external_name(),
3529 external_name());
3530 return nullptr;
3531 }
3532 outer_klass = InstanceKlass::cast(ok);
3533 *inner_is_member = true;
3534 }
3535 if (nullptr == outer_klass) {
3536 // It may be a local class; try for that.
3537 int encl_method_class_idx = enclosing_method_class_index();
3538 if (encl_method_class_idx != 0) {
3539 Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
3540 outer_klass = InstanceKlass::cast(ok);
3541 *inner_is_member = false;
3542 }
3543 }
3544 }
3545
3546 // If no inner class attribute found for this class.
3547 if (nullptr == outer_klass) return nullptr;
3548
3549 // Throws an exception if outer klass has not declared k as an inner klass
3550 // We need evidence that each klass knows about the other, or else
3551 // the system could allow a spoof of an inner class to gain access rights.
3552 Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL);
3553 return outer_klass;
3554 }
3555
3556 u2 InstanceKlass::compute_modifier_flags() const {
3557 u2 access = access_flags().as_unsigned_short();
3558
3559 // But check if it happens to be member class.
3560 InnerClassesIterator iter(this);
3561 for (; !iter.done(); iter.next()) {
3562 int ioff = iter.inner_class_info_index();
3563 // Inner class attribute can be zero, skip it.
3564 // Strange but true: JVM spec. allows null inner class refs.
3565 if (ioff == 0) continue;
3566
3567 // only look at classes that are already loaded
3568 // since we are looking for the flags for our self.
3569 Symbol* inner_name = constants()->klass_name_at(ioff);
3570 if (name() == inner_name) {
3571 // This is really a member class.
3572 access = iter.inner_access_flags();
3573 break;
3574 }
3575 }
3576 return access;
3577 }
3578
3579 jint InstanceKlass::jvmti_class_status() const {
3580 jint result = 0;
3581
3582 if (is_linked()) {
3583 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
3584 }
3585
3586 if (is_initialized()) {
3587 assert(is_linked(), "Class status is not consistent");
3588 result |= JVMTI_CLASS_STATUS_INITIALIZED;
3589 }
3590 if (is_in_error_state()) {
3591 result |= JVMTI_CLASS_STATUS_ERROR;
3592 }
3593 return result;
3594 }
3595
3596 Method* InstanceKlass::method_at_itable(InstanceKlass* holder, int index, TRAPS) {
3597 bool implements_interface; // initialized by method_at_itable_or_null
3598 Method* m = method_at_itable_or_null(holder, index,
3599 implements_interface); // out parameter
3600 if (m != nullptr) {
3601 assert(implements_interface, "sanity");
3602 return m;
3603 } else if (implements_interface) {
3604 // Throw AbstractMethodError since corresponding itable slot is empty.
3605 THROW_NULL(vmSymbols::java_lang_AbstractMethodError());
3606 } else {
3607 // If the interface isn't implemented by the receiver class,
3608 // the VM should throw IncompatibleClassChangeError.
3609 ResourceMark rm(THREAD);
3610 stringStream ss;
3611 bool same_module = (module() == holder->module());
3612 ss.print("Receiver class %s does not implement "
3613 "the interface %s defining the method to be called "
3614 "(%s%s%s)",
3615 external_name(), holder->external_name(),
3616 (same_module) ? joint_in_module_of_loader(holder) : class_in_module_of_loader(),
3617 (same_module) ? "" : "; ",
3618 (same_module) ? "" : holder->class_in_module_of_loader());
3619 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
3620 }
3621 }
3622
3623 Method* InstanceKlass::method_at_itable_or_null(InstanceKlass* holder, int index, bool& implements_interface) {
3624 klassItable itable(this);
3625 for (int i = 0; i < itable.size_offset_table(); i++) {
3626 itableOffsetEntry* offset_entry = itable.offset_entry(i);
3627 if (offset_entry->interface_klass() == holder) {
3628 implements_interface = true;
3629 itableMethodEntry* ime = offset_entry->first_method_entry(this);
3630 Method* m = ime[index].method();
3631 return m;
3632 }
3633 }
3634 implements_interface = false;
3635 return nullptr; // offset entry not found
3636 }
3637
3638 int InstanceKlass::vtable_index_of_interface_method(Method* intf_method) {
3639 assert(is_linked(), "required");
3640 assert(intf_method->method_holder()->is_interface(), "not an interface method");
3641 assert(is_subtype_of(intf_method->method_holder()), "interface not implemented");
3642
3643 int vtable_index = Method::invalid_vtable_index;
3644 Symbol* name = intf_method->name();
3645 Symbol* signature = intf_method->signature();
3646
3647 // First check in default method array
3648 if (!intf_method->is_abstract() && default_methods() != nullptr) {
3649 int index = find_method_index(default_methods(),
3650 name, signature,
3651 Klass::OverpassLookupMode::find,
3652 Klass::StaticLookupMode::find,
3653 Klass::PrivateLookupMode::find);
3654 if (index >= 0) {
3655 vtable_index = default_vtable_indices()->at(index);
3656 }
3657 }
3658 if (vtable_index == Method::invalid_vtable_index) {
3659 // get vtable_index for miranda methods
3660 klassVtable vt = vtable();
3661 vtable_index = vt.index_of_miranda(name, signature);
3662 }
3663 return vtable_index;
3664 }
3665
3666 #if INCLUDE_JVMTI
3667 // update default_methods for redefineclasses for methods that are
3668 // not yet in the vtable due to concurrent subclass define and superinterface
3669 // redefinition
3670 // Note: those in the vtable, should have been updated via adjust_method_entries
3671 void InstanceKlass::adjust_default_methods(bool* trace_name_printed) {
3672 // search the default_methods for uses of either obsolete or EMCP methods
3673 if (default_methods() != nullptr) {
3674 for (int index = 0; index < default_methods()->length(); index ++) {
3675 Method* old_method = default_methods()->at(index);
3676 if (old_method == nullptr || !old_method->is_old()) {
3677 continue; // skip uninteresting entries
3678 }
3679 assert(!old_method->is_deleted(), "default methods may not be deleted");
3680 Method* new_method = old_method->get_new_method();
3681 default_methods()->at_put(index, new_method);
3682
3683 if (log_is_enabled(Info, redefine, class, update)) {
3684 ResourceMark rm;
3685 if (!(*trace_name_printed)) {
3686 log_info(redefine, class, update)
3687 ("adjust: klassname=%s default methods from name=%s",
3688 external_name(), old_method->method_holder()->external_name());
3689 *trace_name_printed = true;
3690 }
3691 log_debug(redefine, class, update, vtables)
3692 ("default method update: %s(%s) ",
3693 new_method->name()->as_C_string(), new_method->signature()->as_C_string());
3694 }
3695 }
3696 }
3697 }
3698 #endif // INCLUDE_JVMTI
3699
3700 // On-stack replacement stuff
3701 void InstanceKlass::add_osr_nmethod(nmethod* n) {
3702 assert_lock_strong(NMethodState_lock);
3703 #ifndef PRODUCT
3704 nmethod* prev = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), n->comp_level(), true);
3705 assert(prev == nullptr || !prev->is_in_use() COMPILER2_PRESENT(|| StressRecompilation),
3706 "redundant OSR recompilation detected. memory leak in CodeCache!");
3707 #endif
3708 // only one compilation can be active
3709 assert(n->is_osr_method(), "wrong kind of nmethod");
3710 n->set_osr_link(osr_nmethods_head());
3711 set_osr_nmethods_head(n);
3712 // Raise the highest osr level if necessary
3713 n->method()->set_highest_osr_comp_level(MAX2(n->method()->highest_osr_comp_level(), n->comp_level()));
3714
3715 // Get rid of the osr methods for the same bci that have lower levels.
3716 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) {
3717 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true);
3718 if (inv != nullptr && inv->is_in_use()) {
3719 inv->make_not_entrant("OSR invalidation of lower levels");
3720 }
3721 }
3722 }
3723
3724 // Remove osr nmethod from the list. Return true if found and removed.
3725 bool InstanceKlass::remove_osr_nmethod(nmethod* n) {
3726 // This is a short non-blocking critical region, so the no safepoint check is ok.
3727 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
3728 assert(n->is_osr_method(), "wrong kind of nmethod");
3729 nmethod* last = nullptr;
3730 nmethod* cur = osr_nmethods_head();
3731 int max_level = CompLevel_none; // Find the max comp level excluding n
3732 Method* m = n->method();
3733 // Search for match
3734 bool found = false;
3735 while(cur != nullptr && cur != n) {
3736 if (m == cur->method()) {
3737 // Find max level before n
3738 max_level = MAX2(max_level, cur->comp_level());
3739 }
3740 last = cur;
3741 cur = cur->osr_link();
3742 }
3743 nmethod* next = nullptr;
3744 if (cur == n) {
3745 found = true;
3746 next = cur->osr_link();
3747 if (last == nullptr) {
3748 // Remove first element
3749 set_osr_nmethods_head(next);
3750 } else {
3751 last->set_osr_link(next);
3752 }
3753 }
3754 n->set_osr_link(nullptr);
3755 cur = next;
3756 while (cur != nullptr) {
3757 // Find max level after n
3758 if (m == cur->method()) {
3759 max_level = MAX2(max_level, cur->comp_level());
3760 }
3761 cur = cur->osr_link();
3762 }
3763 m->set_highest_osr_comp_level(max_level);
3764 return found;
3765 }
3766
3767 int InstanceKlass::mark_osr_nmethods(DeoptimizationScope* deopt_scope, const Method* m) {
3768 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
3769 nmethod* osr = osr_nmethods_head();
3770 int found = 0;
3771 while (osr != nullptr) {
3772 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3773 if (osr->method() == m) {
3774 deopt_scope->mark(osr);
3775 found++;
3776 }
3777 osr = osr->osr_link();
3778 }
3779 return found;
3780 }
3781
3782 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
3783 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
3784 nmethod* osr = osr_nmethods_head();
3785 nmethod* best = nullptr;
3786 while (osr != nullptr) {
3787 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3788 // There can be a time when a c1 osr method exists but we are waiting
3789 // for a c2 version. When c2 completes its osr nmethod we will trash
3790 // the c1 version and only be able to find the c2 version. However
3791 // while we overflow in the c1 code at back branches we don't want to
3792 // try and switch to the same code as we are already running
3793
3794 if (osr->method() == m &&
3795 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
3796 if (match_level) {
3797 if (osr->comp_level() == comp_level) {
3798 // Found a match - return it.
3799 return osr;
3800 }
3801 } else {
3802 if (best == nullptr || (osr->comp_level() > best->comp_level())) {
3803 if (osr->comp_level() == CompilationPolicy::highest_compile_level()) {
3804 // Found the best possible - return it.
3805 return osr;
3806 }
3807 best = osr;
3808 }
3809 }
3810 }
3811 osr = osr->osr_link();
3812 }
3813
3814 assert(match_level == false || best == nullptr, "shouldn't pick up anything if match_level is set");
3815 if (best != nullptr && best->comp_level() >= comp_level) {
3816 return best;
3817 }
3818 return nullptr;
3819 }
3820
3821 // -----------------------------------------------------------------------------------------------------
3822 // Printing
3823
3824 #define BULLET " - "
3825
3826 static const char* state_names[] = {
3827 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
3828 };
3829
3830 static void print_vtable(address self, intptr_t* start, int len, outputStream* st) {
3831 ResourceMark rm;
3832 int* forward_refs = NEW_RESOURCE_ARRAY(int, len);
3833 for (int i = 0; i < len; i++) forward_refs[i] = 0;
3834 for (int i = 0; i < len; i++) {
3835 intptr_t e = start[i];
3836 st->print("%d : " INTPTR_FORMAT, i, e);
3837 if (forward_refs[i] != 0) {
3838 int from = forward_refs[i];
3839 int off = (int) start[from];
3840 st->print(" (offset %d <= [%d])", off, from);
3841 }
3842 if (MetaspaceObj::is_valid((Metadata*)e)) {
3843 st->print(" ");
3844 ((Metadata*)e)->print_value_on(st);
3845 } else if (self != nullptr && e > 0 && e < 0x10000) {
3846 address location = self + e;
3847 int index = (int)((intptr_t*)location - start);
3848 st->print(" (offset %d => [%d])", (int)e, index);
3849 if (index >= 0 && index < len)
3850 forward_refs[index] = i;
3851 }
3852 st->cr();
3853 }
3854 }
3855
3856 static void print_vtable(vtableEntry* start, int len, outputStream* st) {
3857 return print_vtable(nullptr, reinterpret_cast<intptr_t*>(start), len, st);
3858 }
3859
3860 template<typename T>
3861 static void print_array_on(outputStream* st, Array<T>* array) {
3862 if (array == nullptr) { st->print_cr("nullptr"); return; }
3863 array->print_value_on(st); st->cr();
3864 if (Verbose || WizardMode) {
3865 for (int i = 0; i < array->length(); i++) {
3866 st->print("%d : ", i); array->at(i)->print_value_on(st); st->cr();
3867 }
3868 }
3869 }
3870
3871 static void print_array_on(outputStream* st, Array<int>* array) {
3872 if (array == nullptr) { st->print_cr("nullptr"); return; }
3873 array->print_value_on(st); st->cr();
3874 if (Verbose || WizardMode) {
3875 for (int i = 0; i < array->length(); i++) {
3876 st->print("%d : %d", i, array->at(i)); st->cr();
3877 }
3878 }
3879 }
3880
3881 const char* InstanceKlass::init_state_name() const {
3882 return state_names[init_state()];
3883 }
3884
3885 void InstanceKlass::print_on(outputStream* st) const {
3886 assert(is_klass(), "must be klass");
3887 Klass::print_on(st);
3888
3889 st->print(BULLET"instance size: %d", size_helper()); st->cr();
3890 st->print(BULLET"klass size: %d", size()); st->cr();
3891 st->print(BULLET"access: "); access_flags().print_on(st); st->cr();
3892 st->print(BULLET"flags: "); _misc_flags.print_on(st); st->cr();
3893 st->print(BULLET"state: "); st->print_cr("%s", init_state_name());
3894 st->print(BULLET"name: "); name()->print_value_on(st); st->cr();
3895 st->print(BULLET"super: "); Metadata::print_value_on_maybe_null(st, super()); st->cr();
3896 st->print(BULLET"sub: ");
3897 Klass* sub = subklass();
3898 int n;
3899 for (n = 0; sub != nullptr; n++, sub = sub->next_sibling()) {
3900 if (n < MaxSubklassPrintSize) {
3901 sub->print_value_on(st);
3902 st->print(" ");
3903 }
3904 }
3905 if (n >= MaxSubklassPrintSize) st->print("(%zd more klasses...)", n - MaxSubklassPrintSize);
3906 st->cr();
3907
3908 if (is_interface()) {
3909 st->print_cr(BULLET"nof implementors: %d", nof_implementors());
3910 if (nof_implementors() == 1) {
3911 st->print_cr(BULLET"implementor: ");
3912 st->print(" ");
3913 implementor()->print_value_on(st);
3914 st->cr();
3915 }
3916 }
3917
3918 st->print(BULLET"arrays: "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr();
3919 st->print(BULLET"methods: "); print_array_on(st, methods());
3920 st->print(BULLET"method ordering: "); print_array_on(st, method_ordering());
3921 if (default_methods() != nullptr) {
3922 st->print(BULLET"default_methods: "); print_array_on(st, default_methods());
3923 }
3924 print_on_maybe_null(st, BULLET"default vtable indices: ", default_vtable_indices());
3925 st->print(BULLET"local interfaces: "); local_interfaces()->print_value_on(st); st->cr();
3926 st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr();
3927
3928 st->print(BULLET"secondary supers: "); secondary_supers()->print_value_on(st); st->cr();
3929
3930 st->print(BULLET"hash_slot: %d", hash_slot()); st->cr();
3931 st->print(BULLET"secondary bitmap: " UINTX_FORMAT_X_0, _secondary_supers_bitmap); st->cr();
3932
3933 if (secondary_supers() != nullptr) {
3934 if (Verbose) {
3935 bool is_hashed = (_secondary_supers_bitmap != SECONDARY_SUPERS_BITMAP_FULL);
3936 st->print_cr(BULLET"---- secondary supers (%d words):", _secondary_supers->length());
3937 for (int i = 0; i < _secondary_supers->length(); i++) {
3938 ResourceMark rm; // for external_name()
3939 Klass* secondary_super = _secondary_supers->at(i);
3940 st->print(BULLET"%2d:", i);
3941 if (is_hashed) {
3942 int home_slot = compute_home_slot(secondary_super, _secondary_supers_bitmap);
3943 int distance = (i - home_slot) & SECONDARY_SUPERS_TABLE_MASK;
3944 st->print(" dist:%02d:", distance);
3945 }
3946 st->print_cr(" %p %s", secondary_super, secondary_super->external_name());
3947 }
3948 }
3949 }
3950 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr();
3951
3952 print_on_maybe_null(st, BULLET"class loader data: ", class_loader_data());
3953 print_on_maybe_null(st, BULLET"source file: ", source_file_name());
3954 if (source_debug_extension() != nullptr) {
3955 st->print(BULLET"source debug extension: ");
3956 st->print("%s", source_debug_extension());
3957 st->cr();
3958 }
3959 print_on_maybe_null(st, BULLET"class annotations: ", class_annotations());
3960 print_on_maybe_null(st, BULLET"class type annotations: ", class_type_annotations());
3961 print_on_maybe_null(st, BULLET"field annotations: ", fields_annotations());
3962 print_on_maybe_null(st, BULLET"field type annotations: ", fields_type_annotations());
3963 {
3964 bool have_pv = false;
3965 // previous versions are linked together through the InstanceKlass
3966 for (InstanceKlass* pv_node = previous_versions();
3967 pv_node != nullptr;
3968 pv_node = pv_node->previous_versions()) {
3969 if (!have_pv)
3970 st->print(BULLET"previous version: ");
3971 have_pv = true;
3972 pv_node->constants()->print_value_on(st);
3973 }
3974 if (have_pv) st->cr();
3975 }
3976
3977 print_on_maybe_null(st, BULLET"generic signature: ", generic_signature());
3978 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr();
3979 st->print(BULLET"nest members: "); nest_members()->print_value_on(st); st->cr();
3980 print_on_maybe_null(st, BULLET"record components: ", record_components());
3981 st->print(BULLET"permitted subclasses: "); permitted_subclasses()->print_value_on(st); st->cr();
3982 st->print(BULLET"loadable descriptors: "); loadable_descriptors()->print_value_on(st); st->cr();
3983 if (java_mirror() != nullptr) {
3984 st->print(BULLET"java mirror: ");
3985 java_mirror()->print_value_on(st);
3986 st->cr();
3987 } else {
3988 st->print_cr(BULLET"java mirror: null");
3989 }
3990 st->print(BULLET"vtable length %d (start addr: " PTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
3991 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st);
3992 st->print(BULLET"itable length %d (start addr: " PTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
3993 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(nullptr, start_of_itable(), itable_length(), st);
3994 st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
3995
3996 FieldPrinter print_static_field(st);
3997 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
3998 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
3999 FieldPrinter print_nonstatic_field(st);
4000 InstanceKlass* ik = const_cast<InstanceKlass*>(this);
4001 ik->print_nonstatic_fields(&print_nonstatic_field);
4002
4003 st->print(BULLET"non-static oop maps: ");
4004 OopMapBlock* map = start_of_nonstatic_oop_maps();
4005 OopMapBlock* end_map = map + nonstatic_oop_map_count();
4006 while (map < end_map) {
4007 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
4008 map++;
4009 }
4010 st->cr();
4011 }
4012
4013 void InstanceKlass::print_value_on(outputStream* st) const {
4014 assert(is_klass(), "must be klass");
4015 if (Verbose || WizardMode) access_flags().print_on(st);
4016 name()->print_value_on(st);
4017 }
4018
4019 void FieldPrinter::do_field(fieldDescriptor* fd) {
4020 for (int i = 0; i < _indent; i++) _st->print(" ");
4021 _st->print(BULLET);
4022 if (_obj == nullptr) {
4023 fd->print_on(_st, _base_offset);
4024 _st->cr();
4025 } else {
4026 fd->print_on_for(_st, _obj, _indent, _base_offset);
4027 if (!fd->field_flags().is_flat()) _st->cr();
4028 }
4029 }
4030
4031
4032 void InstanceKlass::oop_print_on(oop obj, outputStream* st, int indent, int base_offset) {
4033 Klass::oop_print_on(obj, st);
4034
4035 if (this == vmClasses::String_klass()) {
4036 typeArrayOop value = java_lang_String::value(obj);
4037 juint length = java_lang_String::length(obj);
4038 if (value != nullptr &&
4039 value->is_typeArray() &&
4040 length <= (juint) value->length()) {
4041 st->print(BULLET"string: ");
4042 java_lang_String::print(obj, st);
4043 st->cr();
4044 }
4045 }
4046
4047 st->print_cr(BULLET"---- fields (total size %zu words):", oop_size(obj));
4048 FieldPrinter print_field(st, obj, indent, base_offset);
4049 print_nonstatic_fields(&print_field);
4050
4051 if (this == vmClasses::Class_klass()) {
4052 st->print(BULLET"signature: ");
4053 java_lang_Class::print_signature(obj, st);
4054 st->cr();
4055 Klass* real_klass = java_lang_Class::as_Klass(obj);
4056 if (real_klass != nullptr && real_klass->is_instance_klass()) {
4057 st->print_cr(BULLET"---- static fields (%d):", java_lang_Class::static_oop_field_count(obj));
4058 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
4059 }
4060 } else if (this == vmClasses::MethodType_klass()) {
4061 st->print(BULLET"signature: ");
4062 java_lang_invoke_MethodType::print_signature(obj, st);
4063 st->cr();
4064 }
4065 }
4066
4067 #ifndef PRODUCT
4068
4069 bool InstanceKlass::verify_itable_index(int i) {
4070 int method_count = klassItable::method_count_for_interface(this);
4071 assert(i >= 0 && i < method_count, "index out of bounds");
4072 return true;
4073 }
4074
4075 #endif //PRODUCT
4076
4077 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
4078 st->print("a ");
4079 name()->print_value_on(st);
4080 obj->print_address_on(st);
4081 if (this == vmClasses::String_klass()
4082 && java_lang_String::value(obj) != nullptr) {
4083 ResourceMark rm;
4084 int len = java_lang_String::length(obj);
4085 int plen = (len < 24 ? len : 12);
4086 char* str = java_lang_String::as_utf8_string(obj, 0, plen);
4087 st->print(" = \"%s\"", str);
4088 if (len > plen)
4089 st->print("...[%d]", len);
4090 } else if (this == vmClasses::Class_klass()) {
4091 Klass* k = java_lang_Class::as_Klass(obj);
4092 st->print(" = ");
4093 if (k != nullptr) {
4094 k->print_value_on(st);
4095 } else {
4096 const char* tname = type2name(java_lang_Class::primitive_type(obj));
4097 st->print("%s", tname ? tname : "type?");
4098 }
4099 } else if (this == vmClasses::MethodType_klass()) {
4100 st->print(" = ");
4101 java_lang_invoke_MethodType::print_signature(obj, st);
4102 } else if (java_lang_boxing_object::is_instance(obj)) {
4103 st->print(" = ");
4104 java_lang_boxing_object::print(obj, st);
4105 } else if (this == vmClasses::LambdaForm_klass()) {
4106 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
4107 if (vmentry != nullptr) {
4108 st->print(" => ");
4109 vmentry->print_value_on(st);
4110 }
4111 } else if (this == vmClasses::MemberName_klass()) {
4112 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
4113 if (vmtarget != nullptr) {
4114 st->print(" = ");
4115 vmtarget->print_value_on(st);
4116 } else {
4117 oop clazz = java_lang_invoke_MemberName::clazz(obj);
4118 oop name = java_lang_invoke_MemberName::name(obj);
4119 if (clazz != nullptr) {
4120 clazz->print_value_on(st);
4121 } else {
4122 st->print("null");
4123 }
4124 st->print(".");
4125 if (name != nullptr) {
4126 name->print_value_on(st);
4127 } else {
4128 st->print("null");
4129 }
4130 }
4131 }
4132 }
4133
4134 const char* InstanceKlass::internal_name() const {
4135 return external_name();
4136 }
4137
4138 void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data,
4139 const ModuleEntry* module_entry,
4140 const ClassFileStream* cfs) const {
4141
4142 if (ClassListWriter::is_enabled()) {
4143 ClassListWriter::write(this, cfs);
4144 }
4145
4146 print_class_load_helper(loader_data, module_entry, cfs);
4147 print_class_load_cause_logging();
4148 }
4149
4150 void InstanceKlass::print_class_load_helper(ClassLoaderData* loader_data,
4151 const ModuleEntry* module_entry,
4152 const ClassFileStream* cfs) const {
4153
4154 if (!log_is_enabled(Info, class, load)) {
4155 return;
4156 }
4157
4158 ResourceMark rm;
4159 LogMessage(class, load) msg;
4160 stringStream info_stream;
4161
4162 // Name and class hierarchy info
4163 info_stream.print("%s", external_name());
4164
4165 // Source
4166 if (cfs != nullptr) {
4167 if (cfs->source() != nullptr) {
4168 const char* module_name = (module_entry->name() == nullptr) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
4169 if (module_name != nullptr) {
4170 // When the boot loader created the stream, it didn't know the module name
4171 // yet. Let's format it now.
4172 if (cfs->from_boot_loader_modules_image()) {
4173 info_stream.print(" source: jrt:/%s", module_name);
4174 } else {
4175 info_stream.print(" source: %s", cfs->source());
4176 }
4177 } else {
4178 info_stream.print(" source: %s", cfs->source());
4179 }
4180 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) {
4181 Thread* current = Thread::current();
4182 Klass* caller = current->is_Java_thread() ?
4183 JavaThread::cast(current)->security_get_caller_class(1):
4184 nullptr;
4185 // caller can be null, for example, during a JVMTI VM_Init hook
4186 if (caller != nullptr) {
4187 info_stream.print(" source: instance of %s", caller->external_name());
4188 } else {
4189 // source is unknown
4190 }
4191 } else {
4192 oop class_loader = loader_data->class_loader();
4193 info_stream.print(" source: %s", class_loader->klass()->external_name());
4194 }
4195 } else {
4196 assert(this->is_shared(), "must be");
4197 if (MetaspaceShared::is_shared_dynamic((void*)this)) {
4198 info_stream.print(" source: shared objects file (top)");
4199 } else {
4200 info_stream.print(" source: shared objects file");
4201 }
4202 }
4203
4204 msg.info("%s", info_stream.as_string());
4205
4206 if (log_is_enabled(Debug, class, load)) {
4207 stringStream debug_stream;
4208
4209 // Class hierarchy info
4210 debug_stream.print(" klass: " PTR_FORMAT " super: " PTR_FORMAT,
4211 p2i(this), p2i(superklass()));
4212
4213 // Interfaces
4214 if (local_interfaces() != nullptr && local_interfaces()->length() > 0) {
4215 debug_stream.print(" interfaces:");
4216 int length = local_interfaces()->length();
4217 for (int i = 0; i < length; i++) {
4218 debug_stream.print(" " PTR_FORMAT,
4219 p2i(InstanceKlass::cast(local_interfaces()->at(i))));
4220 }
4221 }
4222
4223 // Class loader
4224 debug_stream.print(" loader: [");
4225 loader_data->print_value_on(&debug_stream);
4226 debug_stream.print("]");
4227
4228 // Classfile checksum
4229 if (cfs) {
4230 debug_stream.print(" bytes: %d checksum: %08x",
4231 cfs->length(),
4232 ClassLoader::crc32(0, (const char*)cfs->buffer(),
4233 cfs->length()));
4234 }
4235
4236 msg.debug("%s", debug_stream.as_string());
4237 }
4238 }
4239
4240 void InstanceKlass::print_class_load_cause_logging() const {
4241 bool log_cause_native = log_is_enabled(Info, class, load, cause, native);
4242 if (log_cause_native || log_is_enabled(Info, class, load, cause)) {
4243 JavaThread* current = JavaThread::current();
4244 ResourceMark rm(current);
4245 const char* name = external_name();
4246
4247 if (LogClassLoadingCauseFor == nullptr ||
4248 (strcmp("*", LogClassLoadingCauseFor) != 0 &&
4249 strstr(name, LogClassLoadingCauseFor) == nullptr)) {
4250 return;
4251 }
4252
4253 // Log Java stack first
4254 {
4255 LogMessage(class, load, cause) msg;
4256 NonInterleavingLogStream info_stream{LogLevelType::Info, msg};
4257
4258 info_stream.print_cr("Java stack when loading %s:", name);
4259 current->print_stack_on(&info_stream);
4260 }
4261
4262 // Log native stack second
4263 if (log_cause_native) {
4264 // Log to string first so that lines can be indented
4265 stringStream stack_stream;
4266 char buf[O_BUFLEN];
4267 address lastpc = nullptr;
4268 NativeStackPrinter nsp(current);
4269 nsp.print_stack(&stack_stream, buf, sizeof(buf), lastpc,
4270 true /* print_source_info */, -1 /* max stack */);
4271
4272 LogMessage(class, load, cause, native) msg;
4273 NonInterleavingLogStream info_stream{LogLevelType::Info, msg};
4274 info_stream.print_cr("Native stack when loading %s:", name);
4275
4276 // Print each native stack line to the log
4277 int size = (int) stack_stream.size();
4278 char* stack = stack_stream.as_string();
4279 char* stack_end = stack + size;
4280 char* line_start = stack;
4281 for (char* p = stack; p < stack_end; p++) {
4282 if (*p == '\n') {
4283 *p = '\0';
4284 info_stream.print_cr("\t%s", line_start);
4285 line_start = p + 1;
4286 }
4287 }
4288 if (line_start < stack_end) {
4289 info_stream.print_cr("\t%s", line_start);
4290 }
4291 }
4292 }
4293 }
4294
4295 // Verification
4296
4297 class VerifyFieldClosure: public BasicOopIterateClosure {
4298 protected:
4299 template <class T> void do_oop_work(T* p) {
4300 oop obj = RawAccess<>::oop_load(p);
4301 if (!oopDesc::is_oop_or_null(obj)) {
4302 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj));
4303 Universe::print_on(tty);
4304 guarantee(false, "boom");
4305 }
4306 }
4307 public:
4308 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); }
4309 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
4310 };
4311
4312 void InstanceKlass::verify_on(outputStream* st) {
4313 #ifndef PRODUCT
4314 // Avoid redundant verifies, this really should be in product.
4315 if (_verify_count == Universe::verify_count()) return;
4316 _verify_count = Universe::verify_count();
4317 #endif
4318
4319 // Verify Klass
4320 Klass::verify_on(st);
4321
4322 // Verify that klass is present in ClassLoaderData
4323 guarantee(class_loader_data()->contains_klass(this),
4324 "this class isn't found in class loader data");
4325
4326 // Verify vtables
4327 if (is_linked()) {
4328 // $$$ This used to be done only for m/s collections. Doing it
4329 // always seemed a valid generalization. (DLD -- 6/00)
4330 vtable().verify(st);
4331 }
4332
4333 // Verify first subklass
4334 if (subklass() != nullptr) {
4335 guarantee(subklass()->is_klass(), "should be klass");
4336 }
4337
4338 // Verify siblings
4339 Klass* super = this->super();
4340 Klass* sib = next_sibling();
4341 if (sib != nullptr) {
4342 if (sib == this) {
4343 fatal("subclass points to itself " PTR_FORMAT, p2i(sib));
4344 }
4345
4346 guarantee(sib->is_klass(), "should be klass");
4347 guarantee(sib->super() == super, "siblings should have same superklass");
4348 }
4349
4350 // Verify local interfaces
4351 if (local_interfaces()) {
4352 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
4353 for (int j = 0; j < local_interfaces->length(); j++) {
4354 InstanceKlass* e = local_interfaces->at(j);
4355 guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
4356 }
4357 }
4358
4359 // Verify transitive interfaces
4360 if (transitive_interfaces() != nullptr) {
4361 Array<InstanceKlass*>* transitive_interfaces = this->transitive_interfaces();
4362 for (int j = 0; j < transitive_interfaces->length(); j++) {
4363 InstanceKlass* e = transitive_interfaces->at(j);
4364 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
4365 }
4366 }
4367
4368 // Verify methods
4369 if (methods() != nullptr) {
4370 Array<Method*>* methods = this->methods();
4371 for (int j = 0; j < methods->length(); j++) {
4372 guarantee(methods->at(j)->is_method(), "non-method in methods array");
4373 }
4374 for (int j = 0; j < methods->length() - 1; j++) {
4375 Method* m1 = methods->at(j);
4376 Method* m2 = methods->at(j + 1);
4377 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
4378 }
4379 }
4380
4381 // Verify method ordering
4382 if (method_ordering() != nullptr) {
4383 Array<int>* method_ordering = this->method_ordering();
4384 int length = method_ordering->length();
4385 if (JvmtiExport::can_maintain_original_method_order() ||
4386 ((CDSConfig::is_using_archive() || CDSConfig::is_dumping_archive()) && length != 0)) {
4387 guarantee(length == methods()->length(), "invalid method ordering length");
4388 jlong sum = 0;
4389 for (int j = 0; j < length; j++) {
4390 int original_index = method_ordering->at(j);
4391 guarantee(original_index >= 0, "invalid method ordering index");
4392 guarantee(original_index < length, "invalid method ordering index");
4393 sum += original_index;
4394 }
4395 // Verify sum of indices 0,1,...,length-1
4396 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
4397 } else {
4398 guarantee(length == 0, "invalid method ordering length");
4399 }
4400 }
4401
4402 // Verify default methods
4403 if (default_methods() != nullptr) {
4404 Array<Method*>* methods = this->default_methods();
4405 for (int j = 0; j < methods->length(); j++) {
4406 guarantee(methods->at(j)->is_method(), "non-method in methods array");
4407 }
4408 for (int j = 0; j < methods->length() - 1; j++) {
4409 Method* m1 = methods->at(j);
4410 Method* m2 = methods->at(j + 1);
4411 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
4412 }
4413 }
4414
4415 // Verify JNI static field identifiers
4416 if (jni_ids() != nullptr) {
4417 jni_ids()->verify(this);
4418 }
4419
4420 // Verify other fields
4421 if (constants() != nullptr) {
4422 guarantee(constants()->is_constantPool(), "should be constant pool");
4423 }
4424 }
4425
4426 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
4427 Klass::oop_verify_on(obj, st);
4428 VerifyFieldClosure blk;
4429 obj->oop_iterate(&blk);
4430 }
4431
4432
4433 // JNIid class for jfieldIDs only
4434 // Note to reviewers:
4435 // These JNI functions are just moved over to column 1 and not changed
4436 // in the compressed oops workspace.
4437 JNIid::JNIid(Klass* holder, int offset, JNIid* next) {
4438 _holder = holder;
4439 _offset = offset;
4440 _next = next;
4441 debug_only(_is_static_field_id = false;)
4442 }
4443
4444
4445 JNIid* JNIid::find(int offset) {
4446 JNIid* current = this;
4447 while (current != nullptr) {
4448 if (current->offset() == offset) return current;
4449 current = current->next();
4450 }
4451 return nullptr;
4452 }
4453
4454 void JNIid::deallocate(JNIid* current) {
4455 while (current != nullptr) {
4456 JNIid* next = current->next();
4457 delete current;
4458 current = next;
4459 }
4460 }
4461
4462
4463 void JNIid::verify(Klass* holder) {
4464 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields();
4465 int end_field_offset;
4466 end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize);
4467
4468 JNIid* current = this;
4469 while (current != nullptr) {
4470 guarantee(current->holder() == holder, "Invalid klass in JNIid");
4471 #ifdef ASSERT
4472 int o = current->offset();
4473 if (current->is_static_field_id()) {
4474 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid");
4475 }
4476 #endif
4477 current = current->next();
4478 }
4479 }
4480
4481 void InstanceKlass::set_init_state(ClassState state) {
4482 #ifdef ASSERT
4483 bool good_state = is_shared() ? (_init_state <= state)
4484 : (_init_state < state);
4485 assert(good_state || state == allocated, "illegal state transition");
4486 #endif
4487 assert(_init_thread == nullptr, "should be cleared before state change");
4488 Atomic::release_store(&_init_state, state);
4489 }
4490
4491 #if INCLUDE_JVMTI
4492
4493 // RedefineClasses() support for previous versions
4494
4495 // Globally, there is at least one previous version of a class to walk
4496 // during class unloading, which is saved because old methods in the class
4497 // are still running. Otherwise the previous version list is cleaned up.
4498 bool InstanceKlass::_should_clean_previous_versions = false;
4499
4500 // Returns true if there are previous versions of a class for class
4501 // unloading only. Also resets the flag to false. purge_previous_version
4502 // will set the flag to true if there are any left, i.e., if there's any
4503 // work to do for next time. This is to avoid the expensive code cache
4504 // walk in CLDG::clean_deallocate_lists().
4505 bool InstanceKlass::should_clean_previous_versions_and_reset() {
4506 bool ret = _should_clean_previous_versions;
4507 log_trace(redefine, class, iklass, purge)("Class unloading: should_clean_previous_versions = %s",
4508 ret ? "true" : "false");
4509 _should_clean_previous_versions = false;
4510 return ret;
4511 }
4512
4513 // This nulls out jmethodIDs for all methods in 'klass'
4514 // It needs to be called explicitly for all previous versions of a class because these may not be cleaned up
4515 // during class unloading.
4516 // We can not use the jmethodID cache associated with klass directly because the 'previous' versions
4517 // do not have the jmethodID cache filled in. Instead, we need to lookup jmethodID for each method and this
4518 // is expensive - O(n) for one jmethodID lookup. For all contained methods it is O(n^2).
4519 // The reason for expensive jmethodID lookup for each method is that there is no direct link between method and jmethodID.
4520 void InstanceKlass::clear_jmethod_ids(InstanceKlass* klass) {
4521 Array<Method*>* method_refs = klass->methods();
4522 for (int k = 0; k < method_refs->length(); k++) {
4523 Method* method = method_refs->at(k);
4524 if (method != nullptr && method->is_obsolete()) {
4525 method->clear_jmethod_id();
4526 }
4527 }
4528 }
4529
4530 // Purge previous versions before adding new previous versions of the class and
4531 // during class unloading.
4532 void InstanceKlass::purge_previous_version_list() {
4533 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
4534 assert(has_been_redefined(), "Should only be called for main class");
4535
4536 // Quick exit.
4537 if (previous_versions() == nullptr) {
4538 return;
4539 }
4540
4541 // This klass has previous versions so see what we can cleanup
4542 // while it is safe to do so.
4543
4544 int deleted_count = 0; // leave debugging breadcrumbs
4545 int live_count = 0;
4546 ClassLoaderData* loader_data = class_loader_data();
4547 assert(loader_data != nullptr, "should never be null");
4548
4549 ResourceMark rm;
4550 log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name());
4551
4552 // previous versions are linked together through the InstanceKlass
4553 InstanceKlass* pv_node = previous_versions();
4554 InstanceKlass* last = this;
4555 int version = 0;
4556
4557 // check the previous versions list
4558 for (; pv_node != nullptr; ) {
4559
4560 ConstantPool* pvcp = pv_node->constants();
4561 assert(pvcp != nullptr, "cp ref was unexpectedly cleared");
4562
4563 if (!pvcp->on_stack()) {
4564 // If the constant pool isn't on stack, none of the methods
4565 // are executing. Unlink this previous_version.
4566 // The previous version InstanceKlass is on the ClassLoaderData deallocate list
4567 // so will be deallocated during the next phase of class unloading.
4568 log_trace(redefine, class, iklass, purge)
4569 ("previous version " PTR_FORMAT " is dead.", p2i(pv_node));
4570 // Unlink from previous version list.
4571 assert(pv_node->class_loader_data() == loader_data, "wrong loader_data");
4572 InstanceKlass* next = pv_node->previous_versions();
4573 clear_jmethod_ids(pv_node); // jmethodID maintenance for the unloaded class
4574 pv_node->link_previous_versions(nullptr); // point next to null
4575 last->link_previous_versions(next);
4576 // Delete this node directly. Nothing is referring to it and we don't
4577 // want it to increase the counter for metadata to delete in CLDG.
4578 MetadataFactory::free_metadata(loader_data, pv_node);
4579 pv_node = next;
4580 deleted_count++;
4581 version++;
4582 continue;
4583 } else {
4584 assert(pvcp->pool_holder() != nullptr, "Constant pool with no holder");
4585 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
4586 live_count++;
4587 if (pvcp->is_shared()) {
4588 // Shared previous versions can never be removed so no cleaning is needed.
4589 log_trace(redefine, class, iklass, purge)("previous version " PTR_FORMAT " is shared", p2i(pv_node));
4590 } else {
4591 // Previous version alive, set that clean is needed for next time.
4592 _should_clean_previous_versions = true;
4593 log_trace(redefine, class, iklass, purge)("previous version " PTR_FORMAT " is alive", p2i(pv_node));
4594 }
4595 }
4596
4597 // next previous version
4598 last = pv_node;
4599 pv_node = pv_node->previous_versions();
4600 version++;
4601 }
4602 log_trace(redefine, class, iklass, purge)
4603 ("previous version stats: live=%d, deleted=%d", live_count, deleted_count);
4604 }
4605
4606 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods,
4607 int emcp_method_count) {
4608 int obsolete_method_count = old_methods->length() - emcp_method_count;
4609
4610 if (emcp_method_count != 0 && obsolete_method_count != 0 &&
4611 _previous_versions != nullptr) {
4612 // We have a mix of obsolete and EMCP methods so we have to
4613 // clear out any matching EMCP method entries the hard way.
4614 int local_count = 0;
4615 for (int i = 0; i < old_methods->length(); i++) {
4616 Method* old_method = old_methods->at(i);
4617 if (old_method->is_obsolete()) {
4618 // only obsolete methods are interesting
4619 Symbol* m_name = old_method->name();
4620 Symbol* m_signature = old_method->signature();
4621
4622 // previous versions are linked together through the InstanceKlass
4623 int j = 0;
4624 for (InstanceKlass* prev_version = _previous_versions;
4625 prev_version != nullptr;
4626 prev_version = prev_version->previous_versions(), j++) {
4627
4628 Array<Method*>* method_refs = prev_version->methods();
4629 for (int k = 0; k < method_refs->length(); k++) {
4630 Method* method = method_refs->at(k);
4631
4632 if (!method->is_obsolete() &&
4633 method->name() == m_name &&
4634 method->signature() == m_signature) {
4635 // The current RedefineClasses() call has made all EMCP
4636 // versions of this method obsolete so mark it as obsolete
4637 log_trace(redefine, class, iklass, add)
4638 ("%s(%s): flush obsolete method @%d in version @%d",
4639 m_name->as_C_string(), m_signature->as_C_string(), k, j);
4640
4641 method->set_is_obsolete();
4642 break;
4643 }
4644 }
4645
4646 // The previous loop may not find a matching EMCP method, but
4647 // that doesn't mean that we can optimize and not go any
4648 // further back in the PreviousVersion generations. The EMCP
4649 // method for this generation could have already been made obsolete,
4650 // but there still may be an older EMCP method that has not
4651 // been made obsolete.
4652 }
4653
4654 if (++local_count >= obsolete_method_count) {
4655 // no more obsolete methods so bail out now
4656 break;
4657 }
4658 }
4659 }
4660 }
4661 }
4662
4663 // Save the scratch_class as the previous version if any of the methods are running.
4664 // The previous_versions are used to set breakpoints in EMCP methods and they are
4665 // also used to clean MethodData links to redefined methods that are no longer running.
4666 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class,
4667 int emcp_method_count) {
4668 assert(Thread::current()->is_VM_thread(),
4669 "only VMThread can add previous versions");
4670
4671 ResourceMark rm;
4672 log_trace(redefine, class, iklass, add)
4673 ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count);
4674
4675 // Clean out old previous versions for this class
4676 purge_previous_version_list();
4677
4678 // Mark newly obsolete methods in remaining previous versions. An EMCP method from
4679 // a previous redefinition may be made obsolete by this redefinition.
4680 Array<Method*>* old_methods = scratch_class->methods();
4681 mark_newly_obsolete_methods(old_methods, emcp_method_count);
4682
4683 // If the constant pool for this previous version of the class
4684 // is not marked as being on the stack, then none of the methods
4685 // in this previous version of the class are on the stack so
4686 // we don't need to add this as a previous version.
4687 ConstantPool* cp_ref = scratch_class->constants();
4688 if (!cp_ref->on_stack()) {
4689 log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running");
4690 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class);
4691 return;
4692 }
4693
4694 // Add previous version if any methods are still running or if this is
4695 // a shared class which should never be removed.
4696 assert(scratch_class->previous_versions() == nullptr, "shouldn't have a previous version");
4697 scratch_class->link_previous_versions(previous_versions());
4698 link_previous_versions(scratch_class);
4699 if (cp_ref->is_shared()) {
4700 log_trace(redefine, class, iklass, add) ("scratch class added; class is shared");
4701 } else {
4702 // We only set clean_previous_versions flag for processing during class
4703 // unloading for non-shared classes.
4704 _should_clean_previous_versions = true;
4705 log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack.");
4706 }
4707 } // end add_previous_version()
4708
4709 #endif // INCLUDE_JVMTI
4710
4711 Method* InstanceKlass::method_with_idnum(int idnum) {
4712 Method* m = nullptr;
4713 if (idnum < methods()->length()) {
4714 m = methods()->at(idnum);
4715 }
4716 if (m == nullptr || m->method_idnum() != idnum) {
4717 for (int index = 0; index < methods()->length(); ++index) {
4718 m = methods()->at(index);
4719 if (m->method_idnum() == idnum) {
4720 return m;
4721 }
4722 }
4723 // None found, return null for the caller to handle.
4724 return nullptr;
4725 }
4726 return m;
4727 }
4728
4729
4730 Method* InstanceKlass::method_with_orig_idnum(int idnum) {
4731 if (idnum >= methods()->length()) {
4732 return nullptr;
4733 }
4734 Method* m = methods()->at(idnum);
4735 if (m != nullptr && m->orig_method_idnum() == idnum) {
4736 return m;
4737 }
4738 // Obsolete method idnum does not match the original idnum
4739 for (int index = 0; index < methods()->length(); ++index) {
4740 m = methods()->at(index);
4741 if (m->orig_method_idnum() == idnum) {
4742 return m;
4743 }
4744 }
4745 // None found, return null for the caller to handle.
4746 return nullptr;
4747 }
4748
4749
4750 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) {
4751 InstanceKlass* holder = get_klass_version(version);
4752 if (holder == nullptr) {
4753 return nullptr; // The version of klass is gone, no method is found
4754 }
4755 Method* method = holder->method_with_orig_idnum(idnum);
4756 return method;
4757 }
4758
4759 #if INCLUDE_JVMTI
4760 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() {
4761 return _cached_class_file;
4762 }
4763
4764 jint InstanceKlass::get_cached_class_file_len() {
4765 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
4766 }
4767
4768 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
4769 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
4770 }
4771 #endif
4772
4773 // Make a step iterating over the class hierarchy under the root class.
4774 // Skips subclasses if requested.
4775 void ClassHierarchyIterator::next() {
4776 assert(_current != nullptr, "required");
4777 if (_visit_subclasses && _current->subklass() != nullptr) {
4778 _current = _current->subklass();
4779 return; // visit next subclass
4780 }
4781 _visit_subclasses = true; // reset
4782 while (_current->next_sibling() == nullptr && _current != _root) {
4783 _current = _current->superklass(); // backtrack; no more sibling subclasses left
4784 }
4785 if (_current == _root) {
4786 // Iteration is over (back at root after backtracking). Invalidate the iterator.
4787 _current = nullptr;
4788 return;
4789 }
4790 _current = _current->next_sibling();
4791 return; // visit next sibling subclass
4792 }