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 "klass.inline.hpp"
54 #include "logging/log.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/constantPool.hpp"
65 #include "oops/fieldStreams.inline.hpp"
66 #include "oops/inlineKlass.hpp"
67 #include "oops/instanceClassLoaderKlass.hpp"
68 #include "oops/instanceKlass.inline.hpp"
69 #include "oops/instanceMirrorKlass.hpp"
70 #include "oops/instanceOop.hpp"
71 #include "oops/instanceStackChunkKlass.hpp"
72 #include "oops/klass.inline.hpp"
73 #include "oops/markWord.hpp"
74 #include "oops/method.hpp"
75 #include "oops/oop.inline.hpp"
76 #include "oops/recordComponent.hpp"
77 #include "oops/refArrayKlass.hpp"
78 #include "oops/symbol.hpp"
79 #include "prims/jvmtiExport.hpp"
80 #include "prims/jvmtiRedefineClasses.hpp"
81 #include "prims/jvmtiThreadState.hpp"
82 #include "prims/methodComparator.hpp"
83 #include "runtime/arguments.hpp"
84 #include "runtime/atomic.hpp"
85 #include "runtime/deoptimization.hpp"
86 #include "runtime/fieldDescriptor.inline.hpp"
87 #include "runtime/handles.inline.hpp"
88 #include "runtime/javaCalls.hpp"
89 #include "runtime/javaThread.inline.hpp"
90 #include "runtime/mutexLocker.hpp"
91 #include "runtime/orderAccess.hpp"
92 #include "runtime/os.inline.hpp"
93 #include "runtime/reflection.hpp"
94 #include "runtime/synchronizer.hpp"
95 #include "runtime/threads.hpp"
96 #include "services/classLoadingService.hpp"
97 #include "services/finalizerService.hpp"
98 #include "services/threadService.hpp"
99 #include "utilities/dtrace.hpp"
100 #include "utilities/events.hpp"
101 #include "utilities/macros.hpp"
102 #include "utilities/nativeStackPrinter.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 = UseClassMetaspaceForAllClasses || 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 (fieldinfo_search_table() != nullptr && !fieldinfo_search_table()->is_shared()) {
750 MetadataFactory::free_array<u1>(loader_data, fieldinfo_search_table());
751 }
752 set_fieldinfo_search_table(nullptr);
753
754 if (fields_status() != nullptr && !fields_status()->is_shared()) {
755 MetadataFactory::free_array<FieldStatus>(loader_data, fields_status());
756 }
757 set_fields_status(nullptr);
758
759 if (inline_layout_info_array() != nullptr) {
760 MetadataFactory::free_array<InlineLayoutInfo>(loader_data, inline_layout_info_array());
761 }
762 set_inline_layout_info_array(nullptr);
763
764 // If a method from a redefined class is using this constant pool, don't
765 // delete it, yet. The new class's previous version will point to this.
766 if (constants() != nullptr) {
767 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack");
768 if (!constants()->is_shared()) {
769 MetadataFactory::free_metadata(loader_data, constants());
770 }
771 // Delete any cached resolution errors for the constant pool
772 SystemDictionary::delete_resolution_error(constants());
773
774 set_constants(nullptr);
775 }
776
777 if (inner_classes() != nullptr &&
778 inner_classes() != Universe::the_empty_short_array() &&
779 !inner_classes()->is_shared()) {
780 MetadataFactory::free_array<jushort>(loader_data, inner_classes());
781 }
782 set_inner_classes(nullptr);
783
784 if (nest_members() != nullptr &&
785 nest_members() != Universe::the_empty_short_array() &&
786 !nest_members()->is_shared()) {
787 MetadataFactory::free_array<jushort>(loader_data, nest_members());
788 }
789 set_nest_members(nullptr);
790
791 if (permitted_subclasses() != nullptr &&
792 permitted_subclasses() != Universe::the_empty_short_array() &&
793 !permitted_subclasses()->is_shared()) {
794 MetadataFactory::free_array<jushort>(loader_data, permitted_subclasses());
795 }
796 set_permitted_subclasses(nullptr);
797
798 if (loadable_descriptors() != nullptr &&
799 loadable_descriptors() != Universe::the_empty_short_array() &&
800 !loadable_descriptors()->is_shared()) {
801 MetadataFactory::free_array<jushort>(loader_data, loadable_descriptors());
802 }
803 set_loadable_descriptors(nullptr);
804
805 // We should deallocate the Annotations instance if it's not in shared spaces.
806 if (annotations() != nullptr && !annotations()->is_shared()) {
807 MetadataFactory::free_metadata(loader_data, annotations());
808 }
809 set_annotations(nullptr);
810
811 SystemDictionaryShared::handle_class_unloading(this);
812
813 #if INCLUDE_CDS_JAVA_HEAP
814 if (CDSConfig::is_dumping_heap()) {
815 HeapShared::remove_scratch_objects(this);
816 }
817 #endif
818 }
819
820 bool InstanceKlass::is_record() const {
821 return _record_components != nullptr &&
822 is_final() &&
823 java_super() == vmClasses::Record_klass();
824 }
825
826 bool InstanceKlass::is_sealed() const {
827 return _permitted_subclasses != nullptr &&
828 _permitted_subclasses != Universe::the_empty_short_array();
829 }
830
831 // JLS 8.9: An enum class is either implicitly final and derives
832 // from java.lang.Enum, or else is implicitly sealed to its
833 // anonymous subclasses. This query detects both kinds.
834 // It does not validate the finality or
835 // sealing conditions: it merely checks for a super of Enum.
836 // This is sufficient for recognizing well-formed enums.
837 bool InstanceKlass::is_enum_subclass() const {
838 InstanceKlass* s = java_super();
839 return (s == vmClasses::Enum_klass() ||
840 (s != nullptr && s->java_super() == vmClasses::Enum_klass()));
841 }
842
843 bool InstanceKlass::should_be_initialized() const {
844 return !is_initialized();
845 }
846
847 klassItable InstanceKlass::itable() const {
848 return klassItable(const_cast<InstanceKlass*>(this));
849 }
850
851 // JVMTI spec thinks there are signers and protection domain in the
852 // instanceKlass. These accessors pretend these fields are there.
853 // The hprof specification also thinks these fields are in InstanceKlass.
854 oop InstanceKlass::protection_domain() const {
855 // return the protection_domain from the mirror
856 return java_lang_Class::protection_domain(java_mirror());
857 }
858
859 objArrayOop InstanceKlass::signers() const {
860 // return the signers from the mirror
861 return java_lang_Class::signers(java_mirror());
862 }
863
864 oop InstanceKlass::init_lock() const {
865 // return the init lock from the mirror
866 oop lock = java_lang_Class::init_lock(java_mirror());
867 // Prevent reordering with any access of initialization state
868 OrderAccess::loadload();
869 assert(lock != nullptr || !is_not_initialized(), // initialized or in_error state
870 "only fully initialized state can have a null lock");
871 return lock;
872 }
873
874 // Set the initialization lock to null so the object can be GC'ed. Any racing
875 // threads to get this lock will see a null lock and will not lock.
876 // That's okay because they all check for initialized state after getting
877 // the lock and return.
878 void InstanceKlass::fence_and_clear_init_lock() {
879 // make sure previous stores are all done, notably the init_state.
880 OrderAccess::storestore();
881 java_lang_Class::clear_init_lock(java_mirror());
882 assert(!is_not_initialized(), "class must be initialized now");
883 }
884
885
886 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization
887 // process. The step comments refers to the procedure described in that section.
888 // Note: implementation moved to static method to expose the this pointer.
889 void InstanceKlass::initialize(TRAPS) {
890 if (this->should_be_initialized()) {
891 initialize_impl(CHECK);
892 // Note: at this point the class may be initialized
893 // OR it may be in the state of being initialized
894 // in case of recursive initialization!
895 } else {
896 assert(is_initialized(), "sanity check");
897 }
898 }
899
900 #ifdef ASSERT
901 void InstanceKlass::assert_no_clinit_will_run_for_aot_initialized_class() const {
902 assert(has_aot_initialized_mirror(), "must be");
903
904 InstanceKlass* s = java_super();
905 if (s != nullptr) {
906 DEBUG_ONLY(ResourceMark rm);
907 assert(s->is_initialized(), "super class %s of aot-inited class %s must have been initialized",
908 s->external_name(), external_name());
909 s->assert_no_clinit_will_run_for_aot_initialized_class();
910 }
911
912 Array<InstanceKlass*>* interfaces = local_interfaces();
913 int len = interfaces->length();
914 for (int i = 0; i < len; i++) {
915 InstanceKlass* intf = interfaces->at(i);
916 if (!intf->is_initialized()) {
917 ResourceMark rm;
918 // Note: an interface needs to be marked as is_initialized() only if
919 // - it has a <clinit>
920 // - it has declared a default method.
921 assert(!intf->interface_needs_clinit_execution_as_super(/*also_check_supers*/false),
922 "uninitialized super interface %s of aot-inited class %s must not have <clinit>",
923 intf->external_name(), external_name());
924 }
925 }
926 }
927 #endif
928
929 #if INCLUDE_CDS
930 void InstanceKlass::initialize_with_aot_initialized_mirror(TRAPS) {
931 assert(has_aot_initialized_mirror(), "must be");
932 assert(CDSConfig::is_loading_heap(), "must be");
933 assert(CDSConfig::is_using_aot_linked_classes(), "must be");
934 assert_no_clinit_will_run_for_aot_initialized_class();
935
936 if (is_initialized()) {
937 return;
938 }
939
940 if (is_runtime_setup_required()) {
941 // Need to take the slow path, which will call the runtimeSetup() function instead
942 // of <clinit>
943 initialize(CHECK);
944 return;
945 }
946 if (log_is_enabled(Info, aot, init)) {
947 ResourceMark rm;
948 log_info(aot, init)("%s (aot-inited)", external_name());
949 }
950
951 link_class(CHECK);
952
953 #ifdef ASSERT
954 {
955 Handle h_init_lock(THREAD, init_lock());
956 ObjectLocker ol(h_init_lock, THREAD);
957 assert(!is_initialized(), "sanity");
958 assert(!is_being_initialized(), "sanity");
959 assert(!is_in_error_state(), "sanity");
960 }
961 #endif
962
963 set_init_thread(THREAD);
964 set_initialization_state_and_notify(fully_initialized, CHECK);
965 }
966 #endif
967
968 bool InstanceKlass::verify_code(TRAPS) {
969 // 1) Verify the bytecodes
970 return Verifier::verify(this, should_verify_class(), THREAD);
971 }
972
973 static void load_classes_from_loadable_descriptors_attribute(InstanceKlass *ik, TRAPS) {
974 ResourceMark rm(THREAD);
975 if (ik->loadable_descriptors() != nullptr && PreloadClasses) {
976 HandleMark hm(THREAD);
977 for (int i = 0; i < ik->loadable_descriptors()->length(); i++) {
978 Symbol* sig = ik->constants()->symbol_at(ik->loadable_descriptors()->at(i));
979 if (!Signature::has_envelope(sig)) continue;
980 TempNewSymbol class_name = Signature::strip_envelope(sig);
981 if (class_name == ik->name()) continue;
982 log_info(class, preload)("Preloading of class %s during linking of class %s "
983 "because of the class is listed in the LoadableDescriptors attribute",
984 sig->as_C_string(), ik->name()->as_C_string());
985 oop loader = ik->class_loader();
986 Klass* klass = SystemDictionary::resolve_or_null(class_name,
987 Handle(THREAD, loader), THREAD);
988 if (HAS_PENDING_EXCEPTION) {
989 CLEAR_PENDING_EXCEPTION;
990 }
991 if (klass != nullptr) {
992 log_info(class, preload)("Preloading of class %s during linking of class %s "
993 "(cause: LoadableDescriptors attribute) succeeded",
994 class_name->as_C_string(), ik->name()->as_C_string());
995 if (!klass->is_inline_klass()) {
996 // Non value class are allowed by the current spec, but it could be an indication
997 // of an issue so let's log a warning
998 log_warning(class, preload)("Preloading of class %s during linking of class %s "
999 "(cause: LoadableDescriptors attribute) but loaded class is not a value class",
1000 class_name->as_C_string(), ik->name()->as_C_string());
1001 }
1002 } else {
1003 log_warning(class, preload)("Preloading of class %s during linking of class %s "
1004 "(cause: LoadableDescriptors attribute) failed",
1005 class_name->as_C_string(), ik->name()->as_C_string());
1006 }
1007 }
1008 }
1009 }
1010
1011 void InstanceKlass::link_class(TRAPS) {
1012 assert(is_loaded(), "must be loaded");
1013 if (!is_linked()) {
1014 link_class_impl(CHECK);
1015 }
1016 }
1017
1018 // Called to verify that a class can link during initialization, without
1019 // throwing a VerifyError.
1020 bool InstanceKlass::link_class_or_fail(TRAPS) {
1021 assert(is_loaded(), "must be loaded");
1022 if (!is_linked()) {
1023 link_class_impl(CHECK_false);
1024 }
1025 return is_linked();
1026 }
1027
1028 bool InstanceKlass::link_class_impl(TRAPS) {
1029 if (CDSConfig::is_dumping_static_archive() && SystemDictionaryShared::has_class_failed_verification(this)) {
1030 // This is for CDS static dump only -- we use the in_error_state to indicate that
1031 // the class has failed verification. Throwing the NoClassDefFoundError here is just
1032 // a convenient way to stop repeat attempts to verify the same (bad) class.
1033 //
1034 // Note that the NoClassDefFoundError is not part of the JLS, and should not be thrown
1035 // if we are executing Java code. This is not a problem for CDS dumping phase since
1036 // it doesn't execute any Java code.
1037 ResourceMark rm(THREAD);
1038 // Names are all known to be < 64k so we know this formatted message is not excessively large.
1039 Exceptions::fthrow(THREAD_AND_LOCATION,
1040 vmSymbols::java_lang_NoClassDefFoundError(),
1041 "Class %s, or one of its supertypes, failed class initialization",
1042 external_name());
1043 return false;
1044 }
1045 // return if already verified
1046 if (is_linked()) {
1047 return true;
1048 }
1049
1050 // Timing
1051 // timer handles recursion
1052 JavaThread* jt = THREAD;
1053
1054 // link super class before linking this class
1055 Klass* super_klass = super();
1056 if (super_klass != nullptr) {
1057 if (super_klass->is_interface()) { // check if super class is an interface
1058 ResourceMark rm(THREAD);
1059 // Names are all known to be < 64k so we know this formatted message is not excessively large.
1060 Exceptions::fthrow(
1061 THREAD_AND_LOCATION,
1062 vmSymbols::java_lang_IncompatibleClassChangeError(),
1063 "class %s has interface %s as super class",
1064 external_name(),
1065 super_klass->external_name()
1066 );
1067 return false;
1068 }
1069
1070 InstanceKlass* ik_super = InstanceKlass::cast(super_klass);
1071 ik_super->link_class_impl(CHECK_false);
1072 }
1073
1074 // link all interfaces implemented by this class before linking this class
1075 Array<InstanceKlass*>* interfaces = local_interfaces();
1076 int num_interfaces = interfaces->length();
1077 for (int index = 0; index < num_interfaces; index++) {
1078 InstanceKlass* interk = interfaces->at(index);
1079 interk->link_class_impl(CHECK_false);
1080 }
1081
1082 if (EnableValhalla) {
1083 // Aggressively preloading all classes from the LoadableDescriptors attribute
1084 // so inline classes can be scalarized in the calling conventions computed below
1085 load_classes_from_loadable_descriptors_attribute(this, THREAD);
1086 assert(!HAS_PENDING_EXCEPTION, "Shouldn't have pending exceptions from call above");
1087 }
1088
1089 // in case the class is linked in the process of linking its superclasses
1090 if (is_linked()) {
1091 return true;
1092 }
1093
1094 // trace only the link time for this klass that includes
1095 // the verification time
1096 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
1097 ClassLoader::perf_class_link_selftime(),
1098 ClassLoader::perf_classes_linked(),
1099 jt->get_thread_stat()->perf_recursion_counts_addr(),
1100 jt->get_thread_stat()->perf_timers_addr(),
1101 PerfClassTraceTime::CLASS_LINK);
1102
1103 // verification & rewriting
1104 {
1105 HandleMark hm(THREAD);
1106 Handle h_init_lock(THREAD, init_lock());
1107 ObjectLocker ol(h_init_lock, jt);
1108 // rewritten will have been set if loader constraint error found
1109 // on an earlier link attempt
1110 // don't verify or rewrite if already rewritten
1111 //
1112
1113 if (!is_linked()) {
1114 if (!is_rewritten()) {
1115 if (is_shared()) {
1116 assert(!verified_at_dump_time(), "must be");
1117 }
1118 {
1119 bool verify_ok = verify_code(THREAD);
1120 if (!verify_ok) {
1121 return false;
1122 }
1123 }
1124
1125 // Just in case a side-effect of verify linked this class already
1126 // (which can sometimes happen since the verifier loads classes
1127 // using custom class loaders, which are free to initialize things)
1128 if (is_linked()) {
1129 return true;
1130 }
1131
1132 // also sets rewritten
1133 rewrite_class(CHECK_false);
1134 } else if (is_shared()) {
1135 SystemDictionaryShared::check_verification_constraints(this, CHECK_false);
1136 }
1137
1138 // relocate jsrs and link methods after they are all rewritten
1139 link_methods(CHECK_false);
1140
1141 // Initialize the vtable and interface table after
1142 // methods have been rewritten since rewrite may
1143 // fabricate new Method*s.
1144 // also does loader constraint checking
1145 //
1146 // initialize_vtable and initialize_itable need to be rerun
1147 // for a shared class if
1148 // 1) the class is loaded by custom class loader or
1149 // 2) the class is loaded by built-in class loader but failed to add archived loader constraints or
1150 // 3) the class was not verified during dump time
1151 bool need_init_table = true;
1152 if (is_shared() && verified_at_dump_time() &&
1153 SystemDictionaryShared::check_linking_constraints(THREAD, this)) {
1154 need_init_table = false;
1155 }
1156 if (need_init_table) {
1157 vtable().initialize_vtable_and_check_constraints(CHECK_false);
1158 itable().initialize_itable_and_check_constraints(CHECK_false);
1159 }
1160 #ifdef ASSERT
1161 vtable().verify(tty, true);
1162 // In case itable verification is ever added.
1163 // itable().verify(tty, true);
1164 #endif
1165 if (Universe::is_fully_initialized()) {
1166 DeoptimizationScope deopt_scope;
1167 {
1168 // Now mark all code that assumes the class is not linked.
1169 // Set state under the Compile_lock also.
1170 MutexLocker ml(THREAD, Compile_lock);
1171
1172 set_init_state(linked);
1173 CodeCache::mark_dependents_on(&deopt_scope, this);
1174 }
1175 // Perform the deopt handshake outside Compile_lock.
1176 deopt_scope.deoptimize_marked();
1177 } else {
1178 set_init_state(linked);
1179 }
1180 if (JvmtiExport::should_post_class_prepare()) {
1181 JvmtiExport::post_class_prepare(THREAD, this);
1182 }
1183 }
1184 }
1185 return true;
1186 }
1187
1188 // Rewrite the byte codes of all of the methods of a class.
1189 // The rewriter must be called exactly once. Rewriting must happen after
1190 // verification but before the first method of the class is executed.
1191 void InstanceKlass::rewrite_class(TRAPS) {
1192 assert(is_loaded(), "must be loaded");
1193 if (is_rewritten()) {
1194 assert(is_shared(), "rewriting an unshared class?");
1195 return;
1196 }
1197 Rewriter::rewrite(this, CHECK);
1198 set_rewritten();
1199 }
1200
1201 // Now relocate and link method entry points after class is rewritten.
1202 // This is outside is_rewritten flag. In case of an exception, it can be
1203 // executed more than once.
1204 void InstanceKlass::link_methods(TRAPS) {
1205 PerfTraceTime timer(ClassLoader::perf_ik_link_methods_time());
1206
1207 int len = methods()->length();
1208 for (int i = len-1; i >= 0; i--) {
1209 methodHandle m(THREAD, methods()->at(i));
1210
1211 // Set up method entry points for compiler and interpreter .
1212 m->link_method(m, CHECK);
1213 }
1214 }
1215
1216 // Eagerly initialize superinterfaces that declare default methods (concrete instance: any access)
1217 void InstanceKlass::initialize_super_interfaces(TRAPS) {
1218 assert (has_nonstatic_concrete_methods(), "caller should have checked this");
1219 for (int i = 0; i < local_interfaces()->length(); ++i) {
1220 InstanceKlass* ik = local_interfaces()->at(i);
1221
1222 // Initialization is depth first search ie. we start with top of the inheritance tree
1223 // has_nonstatic_concrete_methods drives searching superinterfaces since it
1224 // means has_nonstatic_concrete_methods in its superinterface hierarchy
1225 if (ik->has_nonstatic_concrete_methods()) {
1226 ik->initialize_super_interfaces(CHECK);
1227 }
1228
1229 // Only initialize() interfaces that "declare" concrete methods.
1230 if (ik->should_be_initialized() && ik->declares_nonstatic_concrete_methods()) {
1231 ik->initialize(CHECK);
1232 }
1233 }
1234 }
1235
1236 using InitializationErrorTable = HashTable<const InstanceKlass*, OopHandle, 107, AnyObj::C_HEAP, mtClass>;
1237 static InitializationErrorTable* _initialization_error_table;
1238
1239 void InstanceKlass::add_initialization_error(JavaThread* current, Handle exception) {
1240 // Create the same exception with a message indicating the thread name,
1241 // and the StackTraceElements.
1242 Handle init_error = java_lang_Throwable::create_initialization_error(current, exception);
1243 ResourceMark rm(current);
1244 if (init_error.is_null()) {
1245 log_trace(class, init)("Unable to create the desired initialization error for class %s", external_name());
1246
1247 // We failed to create the new exception, most likely due to either out-of-memory or
1248 // a stackoverflow error. If the original exception was either of those then we save
1249 // the shared, pre-allocated, stackless, instance of that exception.
1250 if (exception->klass() == vmClasses::StackOverflowError_klass()) {
1251 log_debug(class, init)("Using shared StackOverflowError as initialization error for class %s", external_name());
1252 init_error = Handle(current, Universe::class_init_stack_overflow_error());
1253 } else if (exception->klass() == vmClasses::OutOfMemoryError_klass()) {
1254 log_debug(class, init)("Using shared OutOfMemoryError as initialization error for class %s", external_name());
1255 init_error = Handle(current, Universe::class_init_out_of_memory_error());
1256 } else {
1257 return;
1258 }
1259 }
1260
1261 MutexLocker ml(current, ClassInitError_lock);
1262 OopHandle elem = OopHandle(Universe::vm_global(), init_error());
1263 bool created;
1264 if (_initialization_error_table == nullptr) {
1265 _initialization_error_table = new (mtClass) InitializationErrorTable();
1266 }
1267 _initialization_error_table->put_if_absent(this, elem, &created);
1268 assert(created, "Initialization is single threaded");
1269 log_trace(class, init)("Initialization error added for class %s", external_name());
1270 }
1271
1272 oop InstanceKlass::get_initialization_error(JavaThread* current) {
1273 MutexLocker ml(current, ClassInitError_lock);
1274 if (_initialization_error_table == nullptr) {
1275 return nullptr;
1276 }
1277 OopHandle* h = _initialization_error_table->get(this);
1278 return (h != nullptr) ? h->resolve() : nullptr;
1279 }
1280
1281 // Need to remove entries for unloaded classes.
1282 void InstanceKlass::clean_initialization_error_table() {
1283 struct InitErrorTableCleaner {
1284 bool do_entry(const InstanceKlass* ik, OopHandle h) {
1285 if (!ik->is_loader_alive()) {
1286 h.release(Universe::vm_global());
1287 return true;
1288 } else {
1289 return false;
1290 }
1291 }
1292 };
1293
1294 assert_locked_or_safepoint(ClassInitError_lock);
1295 InitErrorTableCleaner cleaner;
1296 if (_initialization_error_table != nullptr) {
1297 _initialization_error_table->unlink(&cleaner);
1298 }
1299 }
1300
1301 void InstanceKlass::initialize_impl(TRAPS) {
1302 HandleMark hm(THREAD);
1303
1304 // Make sure klass is linked (verified) before initialization
1305 // A class could already be verified, since it has been reflected upon.
1306 link_class(CHECK);
1307
1308 DTRACE_CLASSINIT_PROBE(required, -1);
1309
1310 bool wait = false;
1311
1312 JavaThread* jt = THREAD;
1313
1314 bool debug_logging_enabled = log_is_enabled(Debug, class, init);
1315
1316 // refer to the JVM book page 47 for description of steps
1317 // Step 1
1318 {
1319 Handle h_init_lock(THREAD, init_lock());
1320 ObjectLocker ol(h_init_lock, jt);
1321
1322 // Step 2
1323 // If we were to use wait() instead of waitInterruptibly() then
1324 // we might end up throwing IE from link/symbol resolution sites
1325 // that aren't expected to throw. This would wreak havoc. See 6320309.
1326 while (is_being_initialized() && !is_reentrant_initialization(jt)) {
1327 if (debug_logging_enabled) {
1328 ResourceMark rm(jt);
1329 log_debug(class, init)("Thread \"%s\" waiting for initialization of %s by thread \"%s\"",
1330 jt->name(), external_name(), init_thread_name());
1331 }
1332 wait = true;
1333 jt->set_class_to_be_initialized(this);
1334 ol.wait_uninterruptibly(jt);
1335 jt->set_class_to_be_initialized(nullptr);
1336 }
1337
1338 // Step 3
1339 if (is_being_initialized() && is_reentrant_initialization(jt)) {
1340 if (debug_logging_enabled) {
1341 ResourceMark rm(jt);
1342 log_debug(class, init)("Thread \"%s\" recursively initializing %s",
1343 jt->name(), external_name());
1344 }
1345 DTRACE_CLASSINIT_PROBE_WAIT(recursive, -1, wait);
1346 return;
1347 }
1348
1349 // Step 4
1350 if (is_initialized()) {
1351 if (debug_logging_enabled) {
1352 ResourceMark rm(jt);
1353 log_debug(class, init)("Thread \"%s\" found %s already initialized",
1354 jt->name(), external_name());
1355 }
1356 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, -1, wait);
1357 return;
1358 }
1359
1360 // Step 5
1361 if (is_in_error_state()) {
1362 if (debug_logging_enabled) {
1363 ResourceMark rm(jt);
1364 log_debug(class, init)("Thread \"%s\" found %s is in error state",
1365 jt->name(), external_name());
1366 }
1367
1368 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait);
1369 ResourceMark rm(THREAD);
1370 Handle cause(THREAD, get_initialization_error(THREAD));
1371
1372 stringStream ss;
1373 ss.print("Could not initialize class %s", external_name());
1374 if (cause.is_null()) {
1375 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), ss.as_string());
1376 } else {
1377 THROW_MSG_CAUSE(vmSymbols::java_lang_NoClassDefFoundError(),
1378 ss.as_string(), cause);
1379 }
1380 } else {
1381
1382 // Step 6
1383 set_init_state(being_initialized);
1384 set_init_thread(jt);
1385 if (debug_logging_enabled) {
1386 ResourceMark rm(jt);
1387 log_debug(class, init)("Thread \"%s\" is initializing %s",
1388 jt->name(), external_name());
1389 }
1390 }
1391 }
1392
1393 // Pre-allocating an all-zero value to be used to reset nullable flat storages
1394 if (is_inline_klass()) {
1395 InlineKlass* vk = InlineKlass::cast(this);
1396 if (vk->has_nullable_atomic_layout()) {
1397 oop val = vk->allocate_instance(THREAD);
1398 if (HAS_PENDING_EXCEPTION) {
1399 Handle e(THREAD, PENDING_EXCEPTION);
1400 CLEAR_PENDING_EXCEPTION;
1401 {
1402 EXCEPTION_MARK;
1403 add_initialization_error(THREAD, e);
1404 // Locks object, set state, and notify all waiting threads
1405 set_initialization_state_and_notify(initialization_error, THREAD);
1406 CLEAR_PENDING_EXCEPTION;
1407 }
1408 THROW_OOP(e());
1409 }
1410 vk->set_null_reset_value(val);
1411 }
1412 }
1413
1414 // Step 7
1415 // Next, if C is a class rather than an interface, initialize it's super class and super
1416 // interfaces.
1417 if (!is_interface()) {
1418 Klass* super_klass = super();
1419 if (super_klass != nullptr && super_klass->should_be_initialized()) {
1420 super_klass->initialize(THREAD);
1421 }
1422 // If C implements any interface that declares a non-static, concrete method,
1423 // the initialization of C triggers initialization of its super interfaces.
1424 // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and
1425 // having a superinterface that declares, non-static, concrete methods
1426 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) {
1427 initialize_super_interfaces(THREAD);
1428 }
1429
1430 // If any exceptions, complete abruptly, throwing the same exception as above.
1431 if (HAS_PENDING_EXCEPTION) {
1432 Handle e(THREAD, PENDING_EXCEPTION);
1433 CLEAR_PENDING_EXCEPTION;
1434 {
1435 EXCEPTION_MARK;
1436 add_initialization_error(THREAD, e);
1437 // Locks object, set state, and notify all waiting threads
1438 set_initialization_state_and_notify(initialization_error, THREAD);
1439 CLEAR_PENDING_EXCEPTION;
1440 }
1441 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait);
1442 THROW_OOP(e());
1443 }
1444 }
1445
1446 // Step 8
1447 {
1448 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
1449 if (class_initializer() != nullptr) {
1450 // Timer includes any side effects of class initialization (resolution,
1451 // etc), but not recursive entry into call_class_initializer().
1452 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
1453 ClassLoader::perf_class_init_selftime(),
1454 ClassLoader::perf_classes_inited(),
1455 jt->get_thread_stat()->perf_recursion_counts_addr(),
1456 jt->get_thread_stat()->perf_timers_addr(),
1457 PerfClassTraceTime::CLASS_CLINIT);
1458 call_class_initializer(THREAD);
1459 } else {
1460 // The elapsed time is so small it's not worth counting.
1461 if (UsePerfData) {
1462 ClassLoader::perf_classes_inited()->inc();
1463 }
1464 call_class_initializer(THREAD);
1465 }
1466
1467 if (has_strict_static_fields() && !HAS_PENDING_EXCEPTION) {
1468 // Step 9 also verifies that strict static fields have been initialized.
1469 // Status bits were set in ClassFileParser::post_process_parsed_stream.
1470 // After <clinit>, bits must all be clear, or else we must throw an error.
1471 // This is an extremely fast check, so we won't bother with a timer.
1472 assert(fields_status() != nullptr, "");
1473 Symbol* bad_strict_static = nullptr;
1474 for (int index = 0; index < fields_status()->length(); index++) {
1475 // Very fast loop over single byte array looking for a set bit.
1476 if (fields_status()->adr_at(index)->is_strict_static_unset()) {
1477 // This strict static field has not been set by the class initializer.
1478 // Note that in the common no-error case, we read no field metadata.
1479 // We only unpack it when we need to report an error.
1480 FieldInfo fi = field(index);
1481 bad_strict_static = fi.name(constants());
1482 if (debug_logging_enabled) {
1483 ResourceMark rm(jt);
1484 const char* msg = format_strict_static_message(bad_strict_static);
1485 log_debug(class, init)("%s", msg);
1486 } else {
1487 // If we are not logging, do not bother to look for a second offense.
1488 break;
1489 }
1490 }
1491 }
1492 if (bad_strict_static != nullptr) {
1493 throw_strict_static_exception(bad_strict_static, "is unset after initialization of", THREAD);
1494 }
1495 }
1496 }
1497
1498 // Step 9
1499 if (!HAS_PENDING_EXCEPTION) {
1500 set_initialization_state_and_notify(fully_initialized, CHECK);
1501 DEBUG_ONLY(vtable().verify(tty, true);)
1502 CompilationPolicy::replay_training_at_init(this, THREAD);
1503 }
1504 else {
1505 // Step 10 and 11
1506 Handle e(THREAD, PENDING_EXCEPTION);
1507 CLEAR_PENDING_EXCEPTION;
1508 // JVMTI has already reported the pending exception
1509 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1510 JvmtiExport::clear_detected_exception(jt);
1511 {
1512 EXCEPTION_MARK;
1513 add_initialization_error(THREAD, e);
1514 set_initialization_state_and_notify(initialization_error, THREAD);
1515 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below
1516 // JVMTI has already reported the pending exception
1517 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1518 JvmtiExport::clear_detected_exception(jt);
1519 }
1520 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
1521 if (e->is_a(vmClasses::Error_klass())) {
1522 THROW_OOP(e());
1523 } else {
1524 JavaCallArguments args(e);
1525 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
1526 vmSymbols::throwable_void_signature(),
1527 &args);
1528 }
1529 }
1530 DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait);
1531 }
1532
1533
1534 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) {
1535 Handle h_init_lock(THREAD, init_lock());
1536 if (h_init_lock() != nullptr) {
1537 ObjectLocker ol(h_init_lock, THREAD);
1538 set_init_thread(nullptr); // reset _init_thread before changing _init_state
1539 set_init_state(state);
1540 fence_and_clear_init_lock();
1541 ol.notify_all(CHECK);
1542 } else {
1543 assert(h_init_lock() != nullptr, "The initialization state should never be set twice");
1544 set_init_thread(nullptr); // reset _init_thread before changing _init_state
1545 set_init_state(state);
1546 }
1547 }
1548
1549 void InstanceKlass::notify_strict_static_access(int field_index, bool is_writing, TRAPS) {
1550 guarantee(field_index >= 0 && field_index < fields_status()->length(), "valid field index");
1551 DEBUG_ONLY(FieldInfo debugfi = field(field_index));
1552 assert(debugfi.access_flags().is_strict(), "");
1553 assert(debugfi.access_flags().is_static(), "");
1554 FieldStatus& fs = *fields_status()->adr_at(field_index);
1555 LogTarget(Trace, class, init) lt;
1556 if (lt.is_enabled()) {
1557 ResourceMark rm(THREAD);
1558 LogStream ls(lt);
1559 FieldInfo fi = field(field_index);
1560 ls.print("notify %s %s %s%s ",
1561 external_name(), is_writing? "Write" : "Read",
1562 fs.is_strict_static_unset() ? "Unset" : "(set)",
1563 fs.is_strict_static_unread() ? "+Unread" : "");
1564 fi.print(&ls, constants());
1565 }
1566 if (fs.is_strict_static_unset()) {
1567 assert(fs.is_strict_static_unread(), "ClassFileParser resp.");
1568 // If it is not set, there are only two reasonable things we can do here:
1569 // - mark it set if this is putstatic
1570 // - throw an error (Read-Before-Write) if this is getstatic
1571
1572 // The unset state is (or should be) transient, and observable only in one
1573 // thread during the execution of <clinit>. Something is wrong here as this
1574 // should not be possible
1575 guarantee(is_reentrant_initialization(THREAD), "unscoped access to strict static");
1576 if (is_writing) {
1577 // clear the "unset" bit, since the field is actually going to be written
1578 fs.update_strict_static_unset(false);
1579 } else {
1580 // throw an IllegalStateException, since we are reading before writing
1581 // see also InstanceKlass::initialize_impl, Step 8 (at end)
1582 Symbol* bad_strict_static = field(field_index).name(constants());
1583 throw_strict_static_exception(bad_strict_static, "is unset before first read in", CHECK);
1584 }
1585 } else {
1586 // Ensure no write after read for final strict statics
1587 FieldInfo fi = field(field_index);
1588 bool is_final = fi.access_flags().is_final();
1589 if (is_final) {
1590 // no final write after read, so observing a constant freezes it, as if <clinit> ended early
1591 // (maybe we could trust the constant a little earlier, before <clinit> ends)
1592 if (is_writing && !fs.is_strict_static_unread()) {
1593 Symbol* bad_strict_static = fi.name(constants());
1594 throw_strict_static_exception(bad_strict_static, "is set after read (as final) in", CHECK);
1595 } else if (!is_writing && fs.is_strict_static_unread()) {
1596 fs.update_strict_static_unread(false);
1597 }
1598 }
1599 }
1600 }
1601
1602 void InstanceKlass::throw_strict_static_exception(Symbol* field_name, const char* when, TRAPS) {
1603 ResourceMark rm(THREAD);
1604 const char* msg = format_strict_static_message(field_name, when);
1605 THROW_MSG(vmSymbols::java_lang_IllegalStateException(), msg);
1606 }
1607
1608 const char* InstanceKlass::format_strict_static_message(Symbol* field_name, const char* when) {
1609 stringStream ss;
1610 ss.print("Strict static \"%s\" %s %s",
1611 field_name->as_C_string(),
1612 when == nullptr ? "is unset in" : when,
1613 external_name());
1614 return ss.as_string();
1615 }
1616
1617 // Update hierarchy. This is done before the new klass has been added to the SystemDictionary. The Compile_lock
1618 // is grabbed, to ensure that the compiler is not using the class hierarchy.
1619 void InstanceKlass::add_to_hierarchy(JavaThread* current) {
1620 assert(!SafepointSynchronize::is_at_safepoint(), "must NOT be at safepoint");
1621
1622 DeoptimizationScope deopt_scope;
1623 {
1624 MutexLocker ml(current, Compile_lock);
1625
1626 set_init_state(InstanceKlass::loaded);
1627 // make sure init_state store is already done.
1628 // The compiler reads the hierarchy outside of the Compile_lock.
1629 // Access ordering is used to add to hierarchy.
1630
1631 // Link into hierarchy.
1632 append_to_sibling_list(); // add to superklass/sibling list
1633 process_interfaces(); // handle all "implements" declarations
1634
1635 // Now mark all code that depended on old class hierarchy.
1636 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97)
1637 if (Universe::is_fully_initialized()) {
1638 CodeCache::mark_dependents_on(&deopt_scope, this);
1639 }
1640 }
1641 // Perform the deopt handshake outside Compile_lock.
1642 deopt_scope.deoptimize_marked();
1643 }
1644
1645
1646 InstanceKlass* InstanceKlass::implementor() const {
1647 InstanceKlass* volatile* ik = adr_implementor();
1648 if (ik == nullptr) {
1649 return nullptr;
1650 } else {
1651 // This load races with inserts, and therefore needs acquire.
1652 InstanceKlass* ikls = Atomic::load_acquire(ik);
1653 if (ikls != nullptr && !ikls->is_loader_alive()) {
1654 return nullptr; // don't return unloaded class
1655 } else {
1656 return ikls;
1657 }
1658 }
1659 }
1660
1661
1662 void InstanceKlass::set_implementor(InstanceKlass* ik) {
1663 assert_locked_or_safepoint(Compile_lock);
1664 assert(is_interface(), "not interface");
1665 InstanceKlass* volatile* addr = adr_implementor();
1666 assert(addr != nullptr, "null addr");
1667 if (addr != nullptr) {
1668 Atomic::release_store(addr, ik);
1669 }
1670 }
1671
1672 int InstanceKlass::nof_implementors() const {
1673 InstanceKlass* ik = implementor();
1674 if (ik == nullptr) {
1675 return 0;
1676 } else if (ik != this) {
1677 return 1;
1678 } else {
1679 return 2;
1680 }
1681 }
1682
1683 // The embedded _implementor field can only record one implementor.
1684 // When there are more than one implementors, the _implementor field
1685 // is set to the interface Klass* itself. Following are the possible
1686 // values for the _implementor field:
1687 // null - no implementor
1688 // implementor Klass* - one implementor
1689 // self - more than one implementor
1690 //
1691 // The _implementor field only exists for interfaces.
1692 void InstanceKlass::add_implementor(InstanceKlass* ik) {
1693 if (Universe::is_fully_initialized()) {
1694 assert_lock_strong(Compile_lock);
1695 }
1696 assert(is_interface(), "not interface");
1697 // Filter out my subinterfaces.
1698 // (Note: Interfaces are never on the subklass list.)
1699 if (ik->is_interface()) return;
1700
1701 // Filter out subclasses whose supers already implement me.
1702 // (Note: CHA must walk subclasses of direct implementors
1703 // in order to locate indirect implementors.)
1704 InstanceKlass* super_ik = ik->java_super();
1705 if (super_ik != nullptr && super_ik->implements_interface(this))
1706 // We only need to check one immediate superclass, since the
1707 // implements_interface query looks at transitive_interfaces.
1708 // Any supers of the super have the same (or fewer) transitive_interfaces.
1709 return;
1710
1711 InstanceKlass* iklass = implementor();
1712 if (iklass == nullptr) {
1713 set_implementor(ik);
1714 } else if (iklass != this && iklass != ik) {
1715 // There is already an implementor. Use itself as an indicator of
1716 // more than one implementors.
1717 set_implementor(this);
1718 }
1719
1720 // The implementor also implements the transitive_interfaces
1721 for (int index = 0; index < local_interfaces()->length(); index++) {
1722 local_interfaces()->at(index)->add_implementor(ik);
1723 }
1724 }
1725
1726 void InstanceKlass::init_implementor() {
1727 if (is_interface()) {
1728 set_implementor(nullptr);
1729 }
1730 }
1731
1732
1733 void InstanceKlass::process_interfaces() {
1734 // link this class into the implementors list of every interface it implements
1735 for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
1736 assert(local_interfaces()->at(i)->is_klass(), "must be a klass");
1737 InstanceKlass* interf = local_interfaces()->at(i);
1738 assert(interf->is_interface(), "expected interface");
1739 interf->add_implementor(this);
1740 }
1741 }
1742
1743 bool InstanceKlass::can_be_primary_super_slow() const {
1744 if (is_interface())
1745 return false;
1746 else
1747 return Klass::can_be_primary_super_slow();
1748 }
1749
1750 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots,
1751 Array<InstanceKlass*>* transitive_interfaces) {
1752 // The secondaries are the implemented interfaces.
1753 // We need the cast because Array<Klass*> is NOT a supertype of Array<InstanceKlass*>,
1754 // (but it's safe to do here because we won't write into _secondary_supers from this point on).
1755 Array<Klass*>* interfaces = (Array<Klass*>*)(address)transitive_interfaces;
1756 int num_secondaries = num_extra_slots + interfaces->length();
1757 if (num_secondaries == 0) {
1758 // Must share this for correct bootstrapping!
1759 set_secondary_supers(Universe::the_empty_klass_array(), Universe::the_empty_klass_bitmap());
1760 return nullptr;
1761 } else if (num_extra_slots == 0 && interfaces->length() <= 1) {
1762 // We will reuse the transitive interfaces list if we're certain
1763 // it's in hash order.
1764 uintx bitmap = compute_secondary_supers_bitmap(interfaces);
1765 set_secondary_supers(interfaces, bitmap);
1766 return nullptr;
1767 }
1768 // Copy transitive interfaces to a temporary growable array to be constructed
1769 // into the secondary super list with extra slots.
1770 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length());
1771 for (int i = 0; i < interfaces->length(); i++) {
1772 secondaries->push(interfaces->at(i));
1773 }
1774 return secondaries;
1775 }
1776
1777 bool InstanceKlass::implements_interface(Klass* k) const {
1778 if (this == k) return true;
1779 assert(k->is_interface(), "should be an interface class");
1780 for (int i = 0; i < transitive_interfaces()->length(); i++) {
1781 if (transitive_interfaces()->at(i) == k) {
1782 return true;
1783 }
1784 }
1785 return false;
1786 }
1787
1788 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const {
1789 // Verify direct super interface
1790 if (this == k) return true;
1791 assert(k->is_interface(), "should be an interface class");
1792 for (int i = 0; i < local_interfaces()->length(); i++) {
1793 if (local_interfaces()->at(i) == k) {
1794 return true;
1795 }
1796 }
1797 return false;
1798 }
1799
1800 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
1801 if (TraceFinalizerRegistration) {
1802 tty->print("Registered ");
1803 i->print_value_on(tty);
1804 tty->print_cr(" (" PTR_FORMAT ") as finalizable", p2i(i));
1805 }
1806 instanceHandle h_i(THREAD, i);
1807 // Pass the handle as argument, JavaCalls::call expects oop as jobjects
1808 JavaValue result(T_VOID);
1809 JavaCallArguments args(h_i);
1810 methodHandle mh(THREAD, Universe::finalizer_register_method());
1811 JavaCalls::call(&result, mh, &args, CHECK_NULL);
1812 MANAGEMENT_ONLY(FinalizerService::on_register(h_i(), THREAD);)
1813 return h_i();
1814 }
1815
1816 instanceOop InstanceKlass::allocate_instance(TRAPS) {
1817 assert(!is_abstract() && !is_interface(), "Should not create this object");
1818 size_t size = size_helper(); // Query before forming handle.
1819 return (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL);
1820 }
1821
1822 instanceOop InstanceKlass::allocate_instance(oop java_class, TRAPS) {
1823 Klass* k = java_lang_Class::as_Klass(java_class);
1824 if (k == nullptr) {
1825 ResourceMark rm(THREAD);
1826 THROW_(vmSymbols::java_lang_InstantiationException(), nullptr);
1827 }
1828 InstanceKlass* ik = cast(k);
1829 ik->check_valid_for_instantiation(false, CHECK_NULL);
1830 ik->initialize(CHECK_NULL);
1831 return ik->allocate_instance(THREAD);
1832 }
1833
1834 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) {
1835 return instanceHandle(THREAD, allocate_instance(THREAD));
1836 }
1837
1838 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1839 if (is_interface() || is_abstract()) {
1840 ResourceMark rm(THREAD);
1841 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1842 : vmSymbols::java_lang_InstantiationException(), external_name());
1843 }
1844 if (this == vmClasses::Class_klass()) {
1845 ResourceMark rm(THREAD);
1846 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1847 : vmSymbols::java_lang_IllegalAccessException(), external_name());
1848 }
1849 }
1850
1851 ArrayKlass* InstanceKlass::array_klass(int n, TRAPS) {
1852 // Need load-acquire for lock-free read
1853 if (array_klasses_acquire() == nullptr) {
1854
1855 // Recursively lock array allocation
1856 RecursiveLocker rl(MultiArray_lock, THREAD);
1857
1858 // Check if another thread created the array klass while we were waiting for the lock.
1859 if (array_klasses() == nullptr) {
1860 ObjArrayKlass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this, CHECK_NULL);
1861 // use 'release' to pair with lock-free load
1862 release_set_array_klasses(k);
1863 }
1864 }
1865
1866 // array_klasses() will always be set at this point
1867 ArrayKlass* ak = array_klasses();
1868 assert(ak != nullptr, "should be set");
1869 return ak->array_klass(n, THREAD);
1870 }
1871
1872 ArrayKlass* InstanceKlass::array_klass_or_null(int n) {
1873 // Need load-acquire for lock-free read
1874 ArrayKlass* ak = array_klasses_acquire();
1875 if (ak == nullptr) {
1876 return nullptr;
1877 } else {
1878 return ak->array_klass_or_null(n);
1879 }
1880 }
1881
1882 ArrayKlass* InstanceKlass::array_klass(TRAPS) {
1883 return array_klass(1, THREAD);
1884 }
1885
1886 ArrayKlass* InstanceKlass::array_klass_or_null() {
1887 return array_klass_or_null(1);
1888 }
1889
1890 static int call_class_initializer_counter = 0; // for debugging
1891
1892 Method* InstanceKlass::class_initializer() const {
1893 Method* clinit = find_method(
1894 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1895 if (clinit != nullptr && clinit->is_class_initializer()) {
1896 return clinit;
1897 }
1898 return nullptr;
1899 }
1900
1901 void InstanceKlass::call_class_initializer(TRAPS) {
1902 if (ReplayCompiles &&
1903 (ReplaySuppressInitializers == 1 ||
1904 (ReplaySuppressInitializers >= 2 && class_loader() != nullptr))) {
1905 // Hide the existence of the initializer for the purpose of replaying the compile
1906 return;
1907 }
1908
1909 #if INCLUDE_CDS
1910 // This is needed to ensure the consistency of the archived heap objects.
1911 if (has_aot_initialized_mirror() && CDSConfig::is_loading_heap()) {
1912 AOTClassInitializer::call_runtime_setup(THREAD, this);
1913 return;
1914 } else if (has_archived_enum_objs()) {
1915 assert(is_shared(), "must be");
1916 bool initialized = CDSEnumKlass::initialize_enum_klass(this, CHECK);
1917 if (initialized) {
1918 return;
1919 }
1920 }
1921 #endif
1922
1923 methodHandle h_method(THREAD, class_initializer());
1924 assert(!is_initialized(), "we cannot initialize twice");
1925 LogTarget(Info, class, init) lt;
1926 if (lt.is_enabled()) {
1927 ResourceMark rm(THREAD);
1928 LogStream ls(lt);
1929 ls.print("%d Initializing ", call_class_initializer_counter++);
1930 name()->print_value_on(&ls);
1931 ls.print_cr("%s (" PTR_FORMAT ") by thread \"%s\"",
1932 h_method() == nullptr ? "(no method)" : "", p2i(this),
1933 THREAD->name());
1934 }
1935 if (h_method() != nullptr) {
1936 ThreadInClassInitializer ticl(THREAD, this); // Track class being initialized
1937 JavaCallArguments args; // No arguments
1938 JavaValue result(T_VOID);
1939 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1940 }
1941 }
1942
1943 // If a class that implements this interface is initialized, is the JVM required
1944 // to first execute a <clinit> method declared in this interface,
1945 // or (if also_check_supers==true) any of the super types of this interface?
1946 //
1947 // JVMS 5.5. Initialization, step 7: Next, if C is a class rather than
1948 // an interface, then let SC be its superclass and let SI1, ..., SIn
1949 // be all superinterfaces of C (whether direct or indirect) that
1950 // declare at least one non-abstract, non-static method.
1951 //
1952 // So when an interface is initialized, it does not look at its
1953 // supers. But a proper class will ensure that all of its supers have
1954 // run their <clinit> methods, except that it disregards interfaces
1955 // that lack a non-static concrete method (i.e., a default method).
1956 // Therefore, you should probably call this method only when the
1957 // current class is a super of some proper class, not an interface.
1958 bool InstanceKlass::interface_needs_clinit_execution_as_super(bool also_check_supers) const {
1959 assert(is_interface(), "must be");
1960
1961 if (!has_nonstatic_concrete_methods()) {
1962 // quick check: no nonstatic concrete methods are declared by this or any super interfaces
1963 return false;
1964 }
1965
1966 // JVMS 5.5. Initialization
1967 // ...If C is an interface that declares a non-abstract,
1968 // non-static method, the initialization of a class that
1969 // implements C directly or indirectly.
1970 if (declares_nonstatic_concrete_methods() && class_initializer() != nullptr) {
1971 return true;
1972 }
1973 if (also_check_supers) {
1974 Array<InstanceKlass*>* all_ifs = transitive_interfaces();
1975 for (int i = 0; i < all_ifs->length(); ++i) {
1976 InstanceKlass* super_intf = all_ifs->at(i);
1977 if (super_intf->declares_nonstatic_concrete_methods() && super_intf->class_initializer() != nullptr) {
1978 return true;
1979 }
1980 }
1981 }
1982 return false;
1983 }
1984
1985 void InstanceKlass::mask_for(const methodHandle& method, int bci,
1986 InterpreterOopMap* entry_for) {
1987 // Lazily create the _oop_map_cache at first request.
1988 // Load_acquire is needed to safely get instance published with CAS by another thread.
1989 OopMapCache* oop_map_cache = Atomic::load_acquire(&_oop_map_cache);
1990 if (oop_map_cache == nullptr) {
1991 // Try to install new instance atomically.
1992 oop_map_cache = new OopMapCache();
1993 OopMapCache* other = Atomic::cmpxchg(&_oop_map_cache, (OopMapCache*)nullptr, oop_map_cache);
1994 if (other != nullptr) {
1995 // Someone else managed to install before us, ditch local copy and use the existing one.
1996 delete oop_map_cache;
1997 oop_map_cache = other;
1998 }
1999 }
2000 // _oop_map_cache is constant after init; lookup below does its own locking.
2001 oop_map_cache->lookup(method, bci, entry_for);
2002 }
2003
2004
2005 FieldInfo InstanceKlass::field(int index) const {
2006 for (AllFieldStream fs(this); !fs.done(); fs.next()) {
2007 if (fs.index() == index) {
2008 return fs.to_FieldInfo();
2009 }
2010 }
2011 fatal("Field not found");
2012 return FieldInfo();
2013 }
2014
2015 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
2016 JavaFieldStream fs(this);
2017 if (fs.lookup(name, sig)) {
2018 assert(fs.name() == name, "name must match");
2019 assert(fs.signature() == sig, "signature must match");
2020 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.to_FieldInfo());
2021 return true;
2022 }
2023 return false;
2024 }
2025
2026
2027 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
2028 const int n = local_interfaces()->length();
2029 for (int i = 0; i < n; i++) {
2030 Klass* intf1 = local_interfaces()->at(i);
2031 assert(intf1->is_interface(), "just checking type");
2032 // search for field in current interface
2033 if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) {
2034 assert(fd->is_static(), "interface field must be static");
2035 return intf1;
2036 }
2037 // search for field in direct superinterfaces
2038 Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd);
2039 if (intf2 != nullptr) return intf2;
2040 }
2041 // otherwise field lookup fails
2042 return nullptr;
2043 }
2044
2045
2046 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
2047 // search order according to newest JVM spec (5.4.3.2, p.167).
2048 // 1) search for field in current klass
2049 if (find_local_field(name, sig, fd)) {
2050 return const_cast<InstanceKlass*>(this);
2051 }
2052 // 2) search for field recursively in direct superinterfaces
2053 { Klass* intf = find_interface_field(name, sig, fd);
2054 if (intf != nullptr) return intf;
2055 }
2056 // 3) apply field lookup recursively if superclass exists
2057 { Klass* supr = super();
2058 if (supr != nullptr) return InstanceKlass::cast(supr)->find_field(name, sig, fd);
2059 }
2060 // 4) otherwise field lookup fails
2061 return nullptr;
2062 }
2063
2064
2065 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
2066 // search order according to newest JVM spec (5.4.3.2, p.167).
2067 // 1) search for field in current klass
2068 if (find_local_field(name, sig, fd)) {
2069 if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
2070 }
2071 // 2) search for field recursively in direct superinterfaces
2072 if (is_static) {
2073 Klass* intf = find_interface_field(name, sig, fd);
2074 if (intf != nullptr) return intf;
2075 }
2076 // 3) apply field lookup recursively if superclass exists
2077 { Klass* supr = super();
2078 if (supr != nullptr) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd);
2079 }
2080 // 4) otherwise field lookup fails
2081 return nullptr;
2082 }
2083
2084 bool InstanceKlass::contains_field_offset(int offset) {
2085 if (this->is_inline_klass()) {
2086 InlineKlass* vk = InlineKlass::cast(this);
2087 return offset >= vk->payload_offset() && offset < (vk->payload_offset() + vk->payload_size_in_bytes());
2088 } else {
2089 fieldDescriptor fd;
2090 return find_field_from_offset(offset, false, &fd);
2091 }
2092 }
2093
2094 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
2095 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
2096 if (fs.offset() == offset) {
2097 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.to_FieldInfo());
2098 if (fd->is_static() == is_static) return true;
2099 }
2100 }
2101 return false;
2102 }
2103
2104
2105 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
2106 Klass* klass = const_cast<InstanceKlass*>(this);
2107 while (klass != nullptr) {
2108 if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) {
2109 return true;
2110 }
2111 klass = klass->super();
2112 }
2113 return false;
2114 }
2115
2116
2117 void InstanceKlass::methods_do(void f(Method* method)) {
2118 // Methods aren't stable until they are loaded. This can be read outside
2119 // a lock through the ClassLoaderData for profiling
2120 // Redefined scratch classes are on the list and need to be cleaned
2121 if (!is_loaded() && !is_scratch_class()) {
2122 return;
2123 }
2124
2125 int len = methods()->length();
2126 for (int index = 0; index < len; index++) {
2127 Method* m = methods()->at(index);
2128 assert(m->is_method(), "must be method");
2129 f(m);
2130 }
2131 }
2132
2133
2134 void InstanceKlass::do_local_static_fields(FieldClosure* cl) {
2135 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
2136 if (fs.access_flags().is_static()) {
2137 fieldDescriptor& fd = fs.field_descriptor();
2138 cl->do_field(&fd);
2139 }
2140 }
2141 }
2142
2143
2144 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) {
2145 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
2146 if (fs.access_flags().is_static()) {
2147 fieldDescriptor& fd = fs.field_descriptor();
2148 f(&fd, mirror, CHECK);
2149 }
2150 }
2151 }
2152
2153 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) {
2154 InstanceKlass* super = superklass();
2155 if (super != nullptr) {
2156 super->do_nonstatic_fields(cl);
2157 }
2158 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
2159 fieldDescriptor& fd = fs.field_descriptor();
2160 if (!fd.is_static()) {
2161 cl->do_field(&fd);
2162 }
2163 }
2164 }
2165
2166 static int compare_fields_by_offset(FieldInfo* a, FieldInfo* b) {
2167 return a->offset() - b->offset();
2168 }
2169
2170 void InstanceKlass::print_nonstatic_fields(FieldClosure* cl) {
2171 InstanceKlass* super = superklass();
2172 if (super != nullptr) {
2173 super->print_nonstatic_fields(cl);
2174 }
2175 ResourceMark rm;
2176 // In DebugInfo nonstatic fields are sorted by offset.
2177 GrowableArray<FieldInfo> fields_sorted;
2178 for (AllFieldStream fs(this); !fs.done(); fs.next()) {
2179 if (!fs.access_flags().is_static()) {
2180 fields_sorted.push(fs.to_FieldInfo());
2181 }
2182 }
2183 int length = fields_sorted.length();
2184 if (length > 0) {
2185 fields_sorted.sort(compare_fields_by_offset);
2186 fieldDescriptor fd;
2187 for (int i = 0; i < length; i++) {
2188 fd.reinitialize(this, fields_sorted.at(i));
2189 assert(!fd.is_static() && fd.offset() == checked_cast<int>(fields_sorted.at(i).offset()), "only nonstatic fields");
2190 cl->do_field(&fd);
2191 }
2192 }
2193 }
2194
2195 #ifdef ASSERT
2196 static int linear_search(const Array<Method*>* methods,
2197 const Symbol* name,
2198 const Symbol* signature) {
2199 const int len = methods->length();
2200 for (int index = 0; index < len; index++) {
2201 const Method* const m = methods->at(index);
2202 assert(m->is_method(), "must be method");
2203 if (m->signature() == signature && m->name() == name) {
2204 return index;
2205 }
2206 }
2207 return -1;
2208 }
2209 #endif
2210
2211 bool InstanceKlass::_disable_method_binary_search = false;
2212
2213 NOINLINE int linear_search(const Array<Method*>* methods, const Symbol* name) {
2214 int len = methods->length();
2215 int l = 0;
2216 int h = len - 1;
2217 while (l <= h) {
2218 Method* m = methods->at(l);
2219 if (m->name() == name) {
2220 return l;
2221 }
2222 l++;
2223 }
2224 return -1;
2225 }
2226
2227 inline int InstanceKlass::quick_search(const Array<Method*>* methods, const Symbol* name) {
2228 if (_disable_method_binary_search) {
2229 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
2230 // At the final stage of dynamic dumping, the methods array may not be sorted
2231 // by ascending addresses of their names, so we can't use binary search anymore.
2232 // However, methods with the same name are still laid out consecutively inside the
2233 // methods array, so let's look for the first one that matches.
2234 return linear_search(methods, name);
2235 }
2236
2237 int len = methods->length();
2238 int l = 0;
2239 int h = len - 1;
2240
2241 // methods are sorted by ascending addresses of their names, so do binary search
2242 while (l <= h) {
2243 int mid = (l + h) >> 1;
2244 Method* m = methods->at(mid);
2245 assert(m->is_method(), "must be method");
2246 int res = m->name()->fast_compare(name);
2247 if (res == 0) {
2248 return mid;
2249 } else if (res < 0) {
2250 l = mid + 1;
2251 } else {
2252 h = mid - 1;
2253 }
2254 }
2255 return -1;
2256 }
2257
2258 // find_method looks up the name/signature in the local methods array
2259 Method* InstanceKlass::find_method(const Symbol* name,
2260 const Symbol* signature) const {
2261 return find_method_impl(name, signature,
2262 OverpassLookupMode::find,
2263 StaticLookupMode::find,
2264 PrivateLookupMode::find);
2265 }
2266
2267 Method* InstanceKlass::find_method_impl(const Symbol* name,
2268 const Symbol* signature,
2269 OverpassLookupMode overpass_mode,
2270 StaticLookupMode static_mode,
2271 PrivateLookupMode private_mode) const {
2272 return InstanceKlass::find_method_impl(methods(),
2273 name,
2274 signature,
2275 overpass_mode,
2276 static_mode,
2277 private_mode);
2278 }
2279
2280 // find_instance_method looks up the name/signature in the local methods array
2281 // and skips over static methods
2282 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods,
2283 const Symbol* name,
2284 const Symbol* signature,
2285 PrivateLookupMode private_mode) {
2286 Method* const meth = InstanceKlass::find_method_impl(methods,
2287 name,
2288 signature,
2289 OverpassLookupMode::find,
2290 StaticLookupMode::skip,
2291 private_mode);
2292 assert(((meth == nullptr) || !meth->is_static()),
2293 "find_instance_method should have skipped statics");
2294 return meth;
2295 }
2296
2297 // find_instance_method looks up the name/signature in the local methods array
2298 // and skips over static methods
2299 Method* InstanceKlass::find_instance_method(const Symbol* name,
2300 const Symbol* signature,
2301 PrivateLookupMode private_mode) const {
2302 return InstanceKlass::find_instance_method(methods(), name, signature, private_mode);
2303 }
2304
2305 // Find looks up the name/signature in the local methods array
2306 // and filters on the overpass, static and private flags
2307 // This returns the first one found
2308 // note that the local methods array can have up to one overpass, one static
2309 // and one instance (private or not) with the same name/signature
2310 Method* InstanceKlass::find_local_method(const Symbol* name,
2311 const Symbol* signature,
2312 OverpassLookupMode overpass_mode,
2313 StaticLookupMode static_mode,
2314 PrivateLookupMode private_mode) const {
2315 return InstanceKlass::find_method_impl(methods(),
2316 name,
2317 signature,
2318 overpass_mode,
2319 static_mode,
2320 private_mode);
2321 }
2322
2323 // Find looks up the name/signature in the local methods array
2324 // and filters on the overpass, static and private flags
2325 // This returns the first one found
2326 // note that the local methods array can have up to one overpass, one static
2327 // and one instance (private or not) with the same name/signature
2328 Method* InstanceKlass::find_local_method(const Array<Method*>* methods,
2329 const Symbol* name,
2330 const Symbol* signature,
2331 OverpassLookupMode overpass_mode,
2332 StaticLookupMode static_mode,
2333 PrivateLookupMode private_mode) {
2334 return InstanceKlass::find_method_impl(methods,
2335 name,
2336 signature,
2337 overpass_mode,
2338 static_mode,
2339 private_mode);
2340 }
2341
2342 Method* InstanceKlass::find_method(const Array<Method*>* methods,
2343 const Symbol* name,
2344 const Symbol* signature) {
2345 return InstanceKlass::find_method_impl(methods,
2346 name,
2347 signature,
2348 OverpassLookupMode::find,
2349 StaticLookupMode::find,
2350 PrivateLookupMode::find);
2351 }
2352
2353 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods,
2354 const Symbol* name,
2355 const Symbol* signature,
2356 OverpassLookupMode overpass_mode,
2357 StaticLookupMode static_mode,
2358 PrivateLookupMode private_mode) {
2359 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode);
2360 return hit >= 0 ? methods->at(hit): nullptr;
2361 }
2362
2363 // true if method matches signature and conforms to skipping_X conditions.
2364 static bool method_matches(const Method* m,
2365 const Symbol* signature,
2366 bool skipping_overpass,
2367 bool skipping_static,
2368 bool skipping_private) {
2369 return ((m->signature() == signature) &&
2370 (!skipping_overpass || !m->is_overpass()) &&
2371 (!skipping_static || !m->is_static()) &&
2372 (!skipping_private || !m->is_private()));
2373 }
2374
2375 // Used directly for default_methods to find the index into the
2376 // default_vtable_indices, and indirectly by find_method
2377 // find_method_index looks in the local methods array to return the index
2378 // of the matching name/signature. If, overpass methods are being ignored,
2379 // the search continues to find a potential non-overpass match. This capability
2380 // is important during method resolution to prefer a static method, for example,
2381 // over an overpass method.
2382 // There is the possibility in any _method's array to have the same name/signature
2383 // for a static method, an overpass method and a local instance method
2384 // To correctly catch a given method, the search criteria may need
2385 // to explicitly skip the other two. For local instance methods, it
2386 // is often necessary to skip private methods
2387 int InstanceKlass::find_method_index(const Array<Method*>* methods,
2388 const Symbol* name,
2389 const Symbol* signature,
2390 OverpassLookupMode overpass_mode,
2391 StaticLookupMode static_mode,
2392 PrivateLookupMode private_mode) {
2393 const bool skipping_overpass = (overpass_mode == OverpassLookupMode::skip);
2394 const bool skipping_static = (static_mode == StaticLookupMode::skip);
2395 const bool skipping_private = (private_mode == PrivateLookupMode::skip);
2396 const int hit = quick_search(methods, name);
2397 if (hit != -1) {
2398 const Method* const m = methods->at(hit);
2399
2400 // Do linear search to find matching signature. First, quick check
2401 // for common case, ignoring overpasses if requested.
2402 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
2403 return hit;
2404 }
2405
2406 // search downwards through overloaded methods
2407 int i;
2408 for (i = hit - 1; i >= 0; --i) {
2409 const Method* const m = methods->at(i);
2410 assert(m->is_method(), "must be method");
2411 if (m->name() != name) {
2412 break;
2413 }
2414 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
2415 return i;
2416 }
2417 }
2418 // search upwards
2419 for (i = hit + 1; i < methods->length(); ++i) {
2420 const Method* const m = methods->at(i);
2421 assert(m->is_method(), "must be method");
2422 if (m->name() != name) {
2423 break;
2424 }
2425 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
2426 return i;
2427 }
2428 }
2429 // not found
2430 #ifdef ASSERT
2431 const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 :
2432 linear_search(methods, name, signature);
2433 assert(-1 == index, "binary search should have found entry %d", index);
2434 #endif
2435 }
2436 return -1;
2437 }
2438
2439 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const {
2440 return find_method_by_name(methods(), name, end);
2441 }
2442
2443 int InstanceKlass::find_method_by_name(const Array<Method*>* methods,
2444 const Symbol* name,
2445 int* end_ptr) {
2446 assert(end_ptr != nullptr, "just checking");
2447 int start = quick_search(methods, name);
2448 int end = start + 1;
2449 if (start != -1) {
2450 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
2451 while (end < methods->length() && (methods->at(end))->name() == name) ++end;
2452 *end_ptr = end;
2453 return start;
2454 }
2455 return -1;
2456 }
2457
2458 // uncached_lookup_method searches both the local class methods array and all
2459 // superclasses methods arrays, skipping any overpass methods in superclasses,
2460 // and possibly skipping private methods.
2461 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
2462 const Symbol* signature,
2463 OverpassLookupMode overpass_mode,
2464 PrivateLookupMode private_mode) const {
2465 OverpassLookupMode overpass_local_mode = overpass_mode;
2466 const Klass* klass = this;
2467 while (klass != nullptr) {
2468 Method* const method = InstanceKlass::cast(klass)->find_method_impl(name,
2469 signature,
2470 overpass_local_mode,
2471 StaticLookupMode::find,
2472 private_mode);
2473 if (method != nullptr) {
2474 return method;
2475 }
2476 if (name == vmSymbols::object_initializer_name()) {
2477 break; // <init> is never inherited
2478 }
2479 klass = klass->super();
2480 overpass_local_mode = OverpassLookupMode::skip; // Always ignore overpass methods in superclasses
2481 }
2482 return nullptr;
2483 }
2484
2485 #ifdef ASSERT
2486 // search through class hierarchy and return true if this class or
2487 // one of the superclasses was redefined
2488 bool InstanceKlass::has_redefined_this_or_super() const {
2489 const Klass* klass = this;
2490 while (klass != nullptr) {
2491 if (InstanceKlass::cast(klass)->has_been_redefined()) {
2492 return true;
2493 }
2494 klass = klass->super();
2495 }
2496 return false;
2497 }
2498 #endif
2499
2500 // lookup a method in the default methods list then in all transitive interfaces
2501 // Do NOT return private or static methods
2502 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
2503 Symbol* signature) const {
2504 Method* m = nullptr;
2505 if (default_methods() != nullptr) {
2506 m = find_method(default_methods(), name, signature);
2507 }
2508 // Look up interfaces
2509 if (m == nullptr) {
2510 m = lookup_method_in_all_interfaces(name, signature, DefaultsLookupMode::find);
2511 }
2512 return m;
2513 }
2514
2515 // lookup a method in all the interfaces that this class implements
2516 // Do NOT return private or static methods, new in JDK8 which are not externally visible
2517 // They should only be found in the initial InterfaceMethodRef
2518 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
2519 Symbol* signature,
2520 DefaultsLookupMode defaults_mode) const {
2521 Array<InstanceKlass*>* all_ifs = transitive_interfaces();
2522 int num_ifs = all_ifs->length();
2523 InstanceKlass *ik = nullptr;
2524 for (int i = 0; i < num_ifs; i++) {
2525 ik = all_ifs->at(i);
2526 Method* m = ik->lookup_method(name, signature);
2527 if (m != nullptr && m->is_public() && !m->is_static() &&
2528 ((defaults_mode != DefaultsLookupMode::skip) || !m->is_default_method())) {
2529 return m;
2530 }
2531 }
2532 return nullptr;
2533 }
2534
2535 PrintClassClosure::PrintClassClosure(outputStream* st, bool verbose)
2536 :_st(st), _verbose(verbose) {
2537 ResourceMark rm;
2538 _st->print("%-18s ", "KlassAddr");
2539 _st->print("%-4s ", "Size");
2540 _st->print("%-20s ", "State");
2541 _st->print("%-7s ", "Flags");
2542 _st->print("%-5s ", "ClassName");
2543 _st->cr();
2544 }
2545
2546 void PrintClassClosure::do_klass(Klass* k) {
2547 ResourceMark rm;
2548 // klass pointer
2549 _st->print(PTR_FORMAT " ", p2i(k));
2550 // klass size
2551 _st->print("%4d ", k->size());
2552 // initialization state
2553 if (k->is_instance_klass()) {
2554 _st->print("%-20s ",InstanceKlass::cast(k)->init_state_name());
2555 } else {
2556 _st->print("%-20s ","");
2557 }
2558 // misc flags(Changes should synced with ClassesDCmd::ClassesDCmd help doc)
2559 char buf[10];
2560 int i = 0;
2561 if (k->has_finalizer()) buf[i++] = 'F';
2562 if (k->is_instance_klass()) {
2563 InstanceKlass* ik = InstanceKlass::cast(k);
2564 if (ik->has_final_method()) buf[i++] = 'f';
2565 if (ik->is_rewritten()) buf[i++] = 'W';
2566 if (ik->is_contended()) buf[i++] = 'C';
2567 if (ik->has_been_redefined()) buf[i++] = 'R';
2568 if (ik->is_shared()) buf[i++] = 'S';
2569 }
2570 buf[i++] = '\0';
2571 _st->print("%-7s ", buf);
2572 // klass name
2573 _st->print("%-5s ", k->external_name());
2574 // end
2575 _st->cr();
2576 if (_verbose) {
2577 k->print_on(_st);
2578 }
2579 }
2580
2581 /* jni_id_for for jfieldIds only */
2582 JNIid* InstanceKlass::jni_id_for(int offset) {
2583 MutexLocker ml(JfieldIdCreation_lock);
2584 JNIid* probe = jni_ids() == nullptr ? nullptr : jni_ids()->find(offset);
2585 if (probe == nullptr) {
2586 // Allocate new static field identifier
2587 probe = new JNIid(this, offset, jni_ids());
2588 set_jni_ids(probe);
2589 }
2590 return probe;
2591 }
2592
2593 u2 InstanceKlass::enclosing_method_data(int offset) const {
2594 const Array<jushort>* const inner_class_list = inner_classes();
2595 if (inner_class_list == nullptr) {
2596 return 0;
2597 }
2598 const int length = inner_class_list->length();
2599 if (length % inner_class_next_offset == 0) {
2600 return 0;
2601 }
2602 const int index = length - enclosing_method_attribute_size;
2603 assert(offset < enclosing_method_attribute_size, "invalid offset");
2604 return inner_class_list->at(index + offset);
2605 }
2606
2607 void InstanceKlass::set_enclosing_method_indices(u2 class_index,
2608 u2 method_index) {
2609 Array<jushort>* inner_class_list = inner_classes();
2610 assert (inner_class_list != nullptr, "_inner_classes list is not set up");
2611 int length = inner_class_list->length();
2612 if (length % inner_class_next_offset == enclosing_method_attribute_size) {
2613 int index = length - enclosing_method_attribute_size;
2614 inner_class_list->at_put(
2615 index + enclosing_method_class_index_offset, class_index);
2616 inner_class_list->at_put(
2617 index + enclosing_method_method_index_offset, method_index);
2618 }
2619 }
2620
2621 jmethodID InstanceKlass::update_jmethod_id(jmethodID* jmeths, Method* method, int idnum) {
2622 if (method->is_old() && !method->is_obsolete()) {
2623 // If the method passed in is old (but not obsolete), use the current version.
2624 method = method_with_idnum((int)idnum);
2625 assert(method != nullptr, "old and but not obsolete, so should exist");
2626 }
2627 jmethodID new_id = Method::make_jmethod_id(class_loader_data(), method);
2628 Atomic::release_store(&jmeths[idnum + 1], new_id);
2629 return new_id;
2630 }
2631
2632 // Allocate the jmethodID cache.
2633 static jmethodID* create_jmethod_id_cache(size_t size) {
2634 jmethodID* 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 return jmeths;
2639 }
2640
2641 // When reading outside a lock, use this.
2642 jmethodID* InstanceKlass::methods_jmethod_ids_acquire() const {
2643 return Atomic::load_acquire(&_methods_jmethod_ids);
2644 }
2645
2646 void InstanceKlass::release_set_methods_jmethod_ids(jmethodID* jmeths) {
2647 Atomic::release_store(&_methods_jmethod_ids, jmeths);
2648 }
2649
2650 // Lookup or create a jmethodID.
2651 jmethodID InstanceKlass::get_jmethod_id(Method* method) {
2652 int idnum = method->method_idnum();
2653 jmethodID* jmeths = methods_jmethod_ids_acquire();
2654
2655 // We use a double-check locking idiom here because this cache is
2656 // performance sensitive. In the normal system, this cache only
2657 // transitions from null to non-null which is safe because we use
2658 // release_set_methods_jmethod_ids() to advertise the new cache.
2659 // A partially constructed cache should never be seen by a racing
2660 // thread. We also use release_store() to save a new jmethodID
2661 // in the cache so a partially constructed jmethodID should never be
2662 // seen either. Cache reads of existing jmethodIDs proceed without a
2663 // lock, but cache writes of a new jmethodID requires uniqueness and
2664 // creation of the cache itself requires no leaks so a lock is
2665 // acquired in those two cases.
2666 //
2667 // If the RedefineClasses() API has been used, then this cache grows
2668 // in the redefinition safepoint.
2669
2670 if (jmeths == nullptr) {
2671 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2672 jmeths = _methods_jmethod_ids;
2673 // Still null?
2674 if (jmeths == nullptr) {
2675 size_t size = idnum_allocated_count();
2676 assert(size > (size_t)idnum, "should already have space");
2677 jmeths = create_jmethod_id_cache(size);
2678 jmethodID new_id = update_jmethod_id(jmeths, method, idnum);
2679
2680 // publish jmeths
2681 release_set_methods_jmethod_ids(jmeths);
2682 return new_id;
2683 }
2684 }
2685
2686 jmethodID id = Atomic::load_acquire(&jmeths[idnum + 1]);
2687 if (id == nullptr) {
2688 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2689 id = jmeths[idnum + 1];
2690 // Still null?
2691 if (id == nullptr) {
2692 return update_jmethod_id(jmeths, method, idnum);
2693 }
2694 }
2695 return id;
2696 }
2697
2698 void InstanceKlass::update_methods_jmethod_cache() {
2699 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
2700 jmethodID* cache = _methods_jmethod_ids;
2701 if (cache != nullptr) {
2702 size_t size = idnum_allocated_count();
2703 size_t old_size = (size_t)cache[0];
2704 if (old_size < size + 1) {
2705 // Allocate a larger one and copy entries to the new one.
2706 // They've already been updated to point to new methods where applicable (i.e., not obsolete).
2707 jmethodID* new_cache = create_jmethod_id_cache(size);
2708
2709 for (int i = 1; i <= (int)old_size; i++) {
2710 new_cache[i] = cache[i];
2711 }
2712 _methods_jmethod_ids = new_cache;
2713 FREE_C_HEAP_ARRAY(jmethodID, cache);
2714 }
2715 }
2716 }
2717
2718 // Make a jmethodID for all methods in this class. This makes getting all method
2719 // ids much, much faster with classes with more than 8
2720 // methods, and has a *substantial* effect on performance with jvmti
2721 // code that loads all jmethodIDs for all classes.
2722 void InstanceKlass::make_methods_jmethod_ids() {
2723 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2724 jmethodID* jmeths = _methods_jmethod_ids;
2725 if (jmeths == nullptr) {
2726 jmeths = create_jmethod_id_cache(idnum_allocated_count());
2727 release_set_methods_jmethod_ids(jmeths);
2728 }
2729
2730 int length = methods()->length();
2731 for (int index = 0; index < length; index++) {
2732 Method* m = methods()->at(index);
2733 int idnum = m->method_idnum();
2734 assert(!m->is_old(), "should not have old methods or I'm confused");
2735 jmethodID id = Atomic::load_acquire(&jmeths[idnum + 1]);
2736 if (!m->is_overpass() && // skip overpasses
2737 id == nullptr) {
2738 id = Method::make_jmethod_id(class_loader_data(), m);
2739 Atomic::release_store(&jmeths[idnum + 1], id);
2740 }
2741 }
2742 }
2743
2744 // Lookup a jmethodID, null if not found. Do no blocking, no allocations, no handles
2745 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
2746 int idnum = method->method_idnum();
2747 jmethodID* jmeths = methods_jmethod_ids_acquire();
2748 return (jmeths != nullptr) ? jmeths[idnum + 1] : nullptr;
2749 }
2750
2751 inline DependencyContext InstanceKlass::dependencies() {
2752 DependencyContext dep_context(&_dep_context, &_dep_context_last_cleaned);
2753 return dep_context;
2754 }
2755
2756 void InstanceKlass::mark_dependent_nmethods(DeoptimizationScope* deopt_scope, KlassDepChange& changes) {
2757 dependencies().mark_dependent_nmethods(deopt_scope, changes);
2758 }
2759
2760 void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
2761 assert_lock_strong(CodeCache_lock);
2762 dependencies().add_dependent_nmethod(nm);
2763 }
2764
2765 void InstanceKlass::clean_dependency_context() {
2766 dependencies().clean_unloading_dependents();
2767 }
2768
2769 #ifndef PRODUCT
2770 void InstanceKlass::print_dependent_nmethods(bool verbose) {
2771 dependencies().print_dependent_nmethods(verbose);
2772 }
2773
2774 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
2775 return dependencies().is_dependent_nmethod(nm);
2776 }
2777 #endif //PRODUCT
2778
2779 void InstanceKlass::clean_weak_instanceklass_links() {
2780 clean_implementors_list();
2781 clean_method_data();
2782 }
2783
2784 void InstanceKlass::clean_implementors_list() {
2785 assert(is_loader_alive(), "this klass should be live");
2786 if (is_interface()) {
2787 assert (ClassUnloading, "only called for ClassUnloading");
2788 for (;;) {
2789 // Use load_acquire due to competing with inserts
2790 InstanceKlass* volatile* iklass = adr_implementor();
2791 assert(iklass != nullptr, "Klass must not be null");
2792 InstanceKlass* impl = Atomic::load_acquire(iklass);
2793 if (impl != nullptr && !impl->is_loader_alive()) {
2794 // null this field, might be an unloaded instance klass or null
2795 if (Atomic::cmpxchg(iklass, impl, (InstanceKlass*)nullptr) == impl) {
2796 // Successfully unlinking implementor.
2797 if (log_is_enabled(Trace, class, unload)) {
2798 ResourceMark rm;
2799 log_trace(class, unload)("unlinking class (implementor): %s", impl->external_name());
2800 }
2801 return;
2802 }
2803 } else {
2804 return;
2805 }
2806 }
2807 }
2808 }
2809
2810 void InstanceKlass::clean_method_data() {
2811 for (int m = 0; m < methods()->length(); m++) {
2812 MethodData* mdo = methods()->at(m)->method_data();
2813 if (mdo != nullptr) {
2814 mdo->clean_method_data(/*always_clean*/false);
2815 }
2816 }
2817 }
2818
2819 void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) {
2820 Klass::metaspace_pointers_do(it);
2821
2822 if (log_is_enabled(Trace, aot)) {
2823 ResourceMark rm;
2824 log_trace(aot)("Iter(InstanceKlass): %p (%s)", this, external_name());
2825 }
2826
2827 it->push(&_annotations);
2828 it->push((Klass**)&_array_klasses);
2829 if (!is_rewritten()) {
2830 it->push(&_constants, MetaspaceClosure::_writable);
2831 } else {
2832 it->push(&_constants);
2833 }
2834 it->push(&_inner_classes);
2835 #if INCLUDE_JVMTI
2836 it->push(&_previous_versions);
2837 #endif
2838 #if INCLUDE_CDS
2839 // For "old" classes with methods containing the jsr bytecode, the _methods array will
2840 // be rewritten during runtime (see Rewriter::rewrite_jsrs()) but they cannot be safely
2841 // checked here with ByteCodeStream. All methods that can't be verified are made writable.
2842 // The length check on the _methods is necessary because classes which don't have any
2843 // methods share the Universe::_the_empty_method_array which is in the RO region.
2844 if (_methods != nullptr && _methods->length() > 0 && !can_be_verified_at_dumptime()) {
2845 // To handle jsr bytecode, new Method* maybe stored into _methods
2846 it->push(&_methods, MetaspaceClosure::_writable);
2847 } else {
2848 #endif
2849 it->push(&_methods);
2850 #if INCLUDE_CDS
2851 }
2852 #endif
2853 it->push(&_default_methods);
2854 it->push(&_local_interfaces);
2855 it->push(&_transitive_interfaces);
2856 it->push(&_method_ordering);
2857 if (!is_rewritten()) {
2858 it->push(&_default_vtable_indices, MetaspaceClosure::_writable);
2859 } else {
2860 it->push(&_default_vtable_indices);
2861 }
2862
2863 it->push(&_fieldinfo_stream);
2864 it->push(&_fieldinfo_search_table);
2865 // _fields_status might be written into by Rewriter::scan_method() -> fd.set_has_initialized_final_update()
2866 it->push(&_fields_status, MetaspaceClosure::_writable);
2867
2868 if (itable_length() > 0) {
2869 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2870 int method_table_offset_in_words = ioe->offset()/wordSize;
2871 int itable_offset_in_words = (int)(start_of_itable() - (intptr_t*)this);
2872
2873 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words)
2874 / itableOffsetEntry::size();
2875
2876 for (int i = 0; i < nof_interfaces; i ++, ioe ++) {
2877 if (ioe->interface_klass() != nullptr) {
2878 it->push(ioe->interface_klass_addr());
2879 itableMethodEntry* ime = ioe->first_method_entry(this);
2880 int n = klassItable::method_count_for_interface(ioe->interface_klass());
2881 for (int index = 0; index < n; index ++) {
2882 it->push(ime[index].method_addr());
2883 }
2884 }
2885 }
2886 }
2887
2888 it->push(&_nest_host);
2889 it->push(&_nest_members);
2890 it->push(&_permitted_subclasses);
2891 it->push(&_loadable_descriptors);
2892 it->push(&_record_components);
2893 it->push(&_inline_layout_info_array, MetaspaceClosure::_writable);
2894 }
2895
2896 #if INCLUDE_CDS
2897 void InstanceKlass::remove_unshareable_info() {
2898
2899 if (is_linked()) {
2900 assert(can_be_verified_at_dumptime(), "must be");
2901 // Remember this so we can avoid walking the hierarchy at runtime.
2902 set_verified_at_dump_time();
2903 }
2904
2905 _misc_flags.set_has_init_deps_processed(false);
2906
2907 Klass::remove_unshareable_info();
2908
2909 if (SystemDictionaryShared::has_class_failed_verification(this)) {
2910 // Classes are attempted to link during dumping and may fail,
2911 // but these classes are still in the dictionary and class list in CLD.
2912 // If the class has failed verification, there is nothing else to remove.
2913 return;
2914 }
2915
2916 // Reset to the 'allocated' state to prevent any premature accessing to
2917 // a shared class at runtime while the class is still being loaded and
2918 // restored. A class' init_state is set to 'loaded' at runtime when it's
2919 // being added to class hierarchy (see InstanceKlass:::add_to_hierarchy()).
2920 _init_state = allocated;
2921
2922 { // Otherwise this needs to take out the Compile_lock.
2923 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
2924 init_implementor();
2925 }
2926
2927 // Call remove_unshareable_info() on other objects that belong to this class, except
2928 // for constants()->remove_unshareable_info(), which is called in a separate pass in
2929 // ArchiveBuilder::make_klasses_shareable(),
2930
2931 for (int i = 0; i < methods()->length(); i++) {
2932 Method* m = methods()->at(i);
2933 m->remove_unshareable_info();
2934 }
2935
2936 // do array classes also.
2937 if (array_klasses() != nullptr) {
2938 array_klasses()->remove_unshareable_info();
2939 }
2940
2941 // These are not allocated from metaspace. They are safe to set to nullptr.
2942 _source_debug_extension = nullptr;
2943 _dep_context = nullptr;
2944 _osr_nmethods_head = nullptr;
2945 #if INCLUDE_JVMTI
2946 _breakpoints = nullptr;
2947 _previous_versions = nullptr;
2948 _cached_class_file = nullptr;
2949 _jvmti_cached_class_field_map = nullptr;
2950 #endif
2951
2952 _init_thread = nullptr;
2953 _methods_jmethod_ids = nullptr;
2954 _jni_ids = nullptr;
2955 _oop_map_cache = nullptr;
2956 if (CDSConfig::is_dumping_method_handles() && HeapShared::is_lambda_proxy_klass(this)) {
2957 // keep _nest_host
2958 } else {
2959 // clear _nest_host to ensure re-load at runtime
2960 _nest_host = nullptr;
2961 }
2962 init_shared_package_entry();
2963 _dep_context_last_cleaned = 0;
2964 DEBUG_ONLY(_shared_class_load_count = 0);
2965
2966 remove_unshareable_flags();
2967
2968 DEBUG_ONLY(FieldInfoStream::validate_search_table(_constants, _fieldinfo_stream, _fieldinfo_search_table));
2969 }
2970
2971 void InstanceKlass::remove_unshareable_flags() {
2972 // clear all the flags/stats that shouldn't be in the archived version
2973 assert(!is_scratch_class(), "must be");
2974 assert(!has_been_redefined(), "must be");
2975 #if INCLUDE_JVMTI
2976 set_is_being_redefined(false);
2977 #endif
2978 set_has_resolved_methods(false);
2979 }
2980
2981 void InstanceKlass::remove_java_mirror() {
2982 Klass::remove_java_mirror();
2983
2984 // do array classes also.
2985 if (array_klasses() != nullptr) {
2986 array_klasses()->remove_java_mirror();
2987 }
2988 }
2989
2990 void InstanceKlass::init_shared_package_entry() {
2991 assert(CDSConfig::is_dumping_archive(), "must be");
2992 #if !INCLUDE_CDS_JAVA_HEAP
2993 _package_entry = nullptr;
2994 #else
2995 if (CDSConfig::is_dumping_full_module_graph()) {
2996 if (defined_by_other_loaders()) {
2997 _package_entry = nullptr;
2998 } else {
2999 _package_entry = PackageEntry::get_archived_entry(_package_entry);
3000 }
3001 } else if (CDSConfig::is_dumping_dynamic_archive() &&
3002 CDSConfig::is_using_full_module_graph() &&
3003 MetaspaceShared::is_in_shared_metaspace(_package_entry)) {
3004 // _package_entry is an archived package in the base archive. Leave it as is.
3005 } else {
3006 _package_entry = nullptr;
3007 }
3008 ArchivePtrMarker::mark_pointer((address**)&_package_entry);
3009 #endif
3010 }
3011
3012 void InstanceKlass::compute_has_loops_flag_for_methods() {
3013 Array<Method*>* methods = this->methods();
3014 for (int index = 0; index < methods->length(); ++index) {
3015 Method* m = methods->at(index);
3016 if (!m->is_overpass()) { // work around JDK-8305771
3017 m->compute_has_loops_flag();
3018 }
3019 }
3020 }
3021
3022 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain,
3023 PackageEntry* pkg_entry, TRAPS) {
3024 // InstanceKlass::add_to_hierarchy() sets the init_state to loaded
3025 // before the InstanceKlass is added to the SystemDictionary. Make
3026 // sure the current state is <loaded.
3027 assert(!is_loaded(), "invalid init state");
3028 assert(!shared_loading_failed(), "Must not try to load failed class again");
3029 set_package(loader_data, pkg_entry, CHECK);
3030 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
3031
3032 if (is_inline_klass()) {
3033 InlineKlass::cast(this)->initialize_calling_convention(CHECK);
3034 }
3035
3036 Array<Method*>* methods = this->methods();
3037 int num_methods = methods->length();
3038 for (int index = 0; index < num_methods; ++index) {
3039 methods->at(index)->restore_unshareable_info(CHECK);
3040 }
3041 #if INCLUDE_JVMTI
3042 if (JvmtiExport::has_redefined_a_class()) {
3043 // Reinitialize vtable because RedefineClasses may have changed some
3044 // entries in this vtable for super classes so the CDS vtable might
3045 // point to old or obsolete entries. RedefineClasses doesn't fix up
3046 // vtables in the shared system dictionary, only the main one.
3047 // It also redefines the itable too so fix that too.
3048 // First fix any default methods that point to a super class that may
3049 // have been redefined.
3050 bool trace_name_printed = false;
3051 adjust_default_methods(&trace_name_printed);
3052 if (verified_at_dump_time()) {
3053 // Initialize vtable and itable for classes which can be verified at dump time.
3054 // Unlinked classes such as old classes with major version < 50 cannot be verified
3055 // at dump time.
3056 vtable().initialize_vtable();
3057 itable().initialize_itable();
3058 }
3059 }
3060 #endif // INCLUDE_JVMTI
3061
3062 // restore constant pool resolved references
3063 constants()->restore_unshareable_info(CHECK);
3064
3065 if (array_klasses() != nullptr) {
3066 // To get a consistent list of classes we need MultiArray_lock to ensure
3067 // array classes aren't observed while they are being restored.
3068 RecursiveLocker rl(MultiArray_lock, THREAD);
3069 assert(this == ObjArrayKlass::cast(array_klasses())->bottom_klass(), "sanity");
3070 // Array classes have null protection domain.
3071 // --> see ArrayKlass::complete_create_array_klass()
3072 if (class_loader_data() == nullptr) {
3073 ResourceMark rm(THREAD);
3074 log_debug(cds)(" loader_data %s ", loader_data == nullptr ? "nullptr" : "non null");
3075 log_debug(cds)(" this %s array_klasses %s ", this->name()->as_C_string(), array_klasses()->name()->as_C_string());
3076 }
3077 assert(!array_klasses()->is_refined_objArray_klass(), "must be non-refined objarrayklass");
3078 array_klasses()->restore_unshareable_info(class_loader_data(), Handle(), CHECK);
3079 }
3080
3081 // Initialize @ValueBased class annotation if not already set in the archived klass.
3082 if (DiagnoseSyncOnValueBasedClasses && has_value_based_class_annotation() && !is_value_based()) {
3083 set_is_value_based();
3084 }
3085
3086 DEBUG_ONLY(FieldInfoStream::validate_search_table(_constants, _fieldinfo_stream, _fieldinfo_search_table));
3087 }
3088
3089 // Check if a class or any of its supertypes has a version older than 50.
3090 // CDS will not perform verification of old classes during dump time because
3091 // without changing the old verifier, the verification constraint cannot be
3092 // retrieved during dump time.
3093 // Verification of archived old classes will be performed during run time.
3094 bool InstanceKlass::can_be_verified_at_dumptime() const {
3095 if (MetaspaceShared::is_in_shared_metaspace(this)) {
3096 // This is a class that was dumped into the base archive, so we know
3097 // it was verified at dump time.
3098 return true;
3099 }
3100 if (major_version() < 50 /*JAVA_6_VERSION*/) {
3101 return false;
3102 }
3103 if (java_super() != nullptr && !java_super()->can_be_verified_at_dumptime()) {
3104 return false;
3105 }
3106 Array<InstanceKlass*>* interfaces = local_interfaces();
3107 int len = interfaces->length();
3108 for (int i = 0; i < len; i++) {
3109 if (!interfaces->at(i)->can_be_verified_at_dumptime()) {
3110 return false;
3111 }
3112 }
3113 return true;
3114 }
3115
3116 #endif // INCLUDE_CDS
3117
3118 #if INCLUDE_JVMTI
3119 static void clear_all_breakpoints(Method* m) {
3120 m->clear_all_breakpoints();
3121 }
3122 #endif
3123
3124 void InstanceKlass::unload_class(InstanceKlass* ik) {
3125
3126 if (ik->is_scratch_class()) {
3127 assert(ik->dependencies().is_empty(), "dependencies should be empty for scratch classes");
3128 return;
3129 }
3130 assert(ik->is_loaded(), "class should be loaded " PTR_FORMAT, p2i(ik));
3131
3132 // Release dependencies.
3133 ik->dependencies().remove_all_dependents();
3134
3135 // notify the debugger
3136 if (JvmtiExport::should_post_class_unload()) {
3137 JvmtiExport::post_class_unload(ik);
3138 }
3139
3140 // notify ClassLoadingService of class unload
3141 ClassLoadingService::notify_class_unloaded(ik);
3142
3143 SystemDictionaryShared::handle_class_unloading(ik);
3144
3145 if (log_is_enabled(Info, class, unload)) {
3146 ResourceMark rm;
3147 log_info(class, unload)("unloading class %s " PTR_FORMAT, ik->external_name(), p2i(ik));
3148 }
3149
3150 Events::log_class_unloading(Thread::current(), ik);
3151
3152 #if INCLUDE_JFR
3153 assert(ik != nullptr, "invariant");
3154 EventClassUnload event;
3155 event.set_unloadedClass(ik);
3156 event.set_definingClassLoader(ik->class_loader_data());
3157 event.commit();
3158 #endif
3159 }
3160
3161 static void method_release_C_heap_structures(Method* m) {
3162 m->release_C_heap_structures();
3163 }
3164
3165 // Called also by InstanceKlass::deallocate_contents, with false for release_sub_metadata.
3166 void InstanceKlass::release_C_heap_structures(bool release_sub_metadata) {
3167 // Clean up C heap
3168 Klass::release_C_heap_structures();
3169
3170 // Deallocate and call destructors for MDO mutexes
3171 if (release_sub_metadata) {
3172 methods_do(method_release_C_heap_structures);
3173 }
3174
3175 // Deallocate oop map cache
3176 if (_oop_map_cache != nullptr) {
3177 delete _oop_map_cache;
3178 _oop_map_cache = nullptr;
3179 }
3180
3181 // Deallocate JNI identifiers for jfieldIDs
3182 JNIid::deallocate(jni_ids());
3183 set_jni_ids(nullptr);
3184
3185 jmethodID* jmeths = _methods_jmethod_ids;
3186 if (jmeths != nullptr) {
3187 release_set_methods_jmethod_ids(nullptr);
3188 FreeHeap(jmeths);
3189 }
3190
3191 assert(_dep_context == nullptr,
3192 "dependencies should already be cleaned");
3193
3194 #if INCLUDE_JVMTI
3195 // Deallocate breakpoint records
3196 if (breakpoints() != nullptr) {
3197 methods_do(clear_all_breakpoints);
3198 assert(breakpoints() == nullptr, "should have cleared breakpoints");
3199 }
3200
3201 // deallocate the cached class file
3202 if (_cached_class_file != nullptr) {
3203 os::free(_cached_class_file);
3204 _cached_class_file = nullptr;
3205 }
3206 #endif
3207
3208 FREE_C_HEAP_ARRAY(char, _source_debug_extension);
3209
3210 if (release_sub_metadata) {
3211 constants()->release_C_heap_structures();
3212 }
3213 }
3214
3215 // The constant pool is on stack if any of the methods are executing or
3216 // referenced by handles.
3217 bool InstanceKlass::on_stack() const {
3218 return _constants->on_stack();
3219 }
3220
3221 Symbol* InstanceKlass::source_file_name() const { return _constants->source_file_name(); }
3222 u2 InstanceKlass::source_file_name_index() const { return _constants->source_file_name_index(); }
3223 void InstanceKlass::set_source_file_name_index(u2 sourcefile_index) { _constants->set_source_file_name_index(sourcefile_index); }
3224
3225 // minor and major version numbers of class file
3226 u2 InstanceKlass::minor_version() const { return _constants->minor_version(); }
3227 void InstanceKlass::set_minor_version(u2 minor_version) { _constants->set_minor_version(minor_version); }
3228 u2 InstanceKlass::major_version() const { return _constants->major_version(); }
3229 void InstanceKlass::set_major_version(u2 major_version) { _constants->set_major_version(major_version); }
3230
3231 bool InstanceKlass::supports_inline_types() const {
3232 return major_version() >= Verifier::VALUE_TYPES_MAJOR_VERSION && minor_version() == Verifier::JAVA_PREVIEW_MINOR_VERSION;
3233 }
3234
3235 const InstanceKlass* InstanceKlass::get_klass_version(int version) const {
3236 for (const InstanceKlass* ik = this; ik != nullptr; ik = ik->previous_versions()) {
3237 if (ik->constants()->version() == version) {
3238 return ik;
3239 }
3240 }
3241 return nullptr;
3242 }
3243
3244 void InstanceKlass::set_source_debug_extension(const char* array, int length) {
3245 if (array == nullptr) {
3246 _source_debug_extension = nullptr;
3247 } else {
3248 // Adding one to the attribute length in order to store a null terminator
3249 // character could cause an overflow because the attribute length is
3250 // already coded with an u4 in the classfile, but in practice, it's
3251 // unlikely to happen.
3252 assert((length+1) > length, "Overflow checking");
3253 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
3254 for (int i = 0; i < length; i++) {
3255 sde[i] = array[i];
3256 }
3257 sde[length] = '\0';
3258 _source_debug_extension = sde;
3259 }
3260 }
3261
3262 Symbol* InstanceKlass::generic_signature() const { return _constants->generic_signature(); }
3263 u2 InstanceKlass::generic_signature_index() const { return _constants->generic_signature_index(); }
3264 void InstanceKlass::set_generic_signature_index(u2 sig_index) { _constants->set_generic_signature_index(sig_index); }
3265
3266 const char* InstanceKlass::signature_name() const {
3267 return signature_name_of_carrier(JVM_SIGNATURE_CLASS);
3268 }
3269
3270 const char* InstanceKlass::signature_name_of_carrier(char c) const {
3271 // Get the internal name as a c string
3272 const char* src = (const char*) (name()->as_C_string());
3273 const int src_length = (int)strlen(src);
3274
3275 char* dest = NEW_RESOURCE_ARRAY(char, src_length + 3);
3276
3277 // Add L or Q as type indicator
3278 int dest_index = 0;
3279 dest[dest_index++] = c;
3280
3281 // Add the actual class name
3282 for (int src_index = 0; src_index < src_length; ) {
3283 dest[dest_index++] = src[src_index++];
3284 }
3285
3286 if (is_hidden()) { // Replace the last '+' with a '.'.
3287 for (int index = (int)src_length; index > 0; index--) {
3288 if (dest[index] == '+') {
3289 dest[index] = JVM_SIGNATURE_DOT;
3290 break;
3291 }
3292 }
3293 }
3294
3295 // Add the semicolon and the null
3296 dest[dest_index++] = JVM_SIGNATURE_ENDCLASS;
3297 dest[dest_index] = '\0';
3298 return dest;
3299 }
3300
3301 ModuleEntry* InstanceKlass::module() const {
3302 if (is_hidden() &&
3303 in_unnamed_package() &&
3304 class_loader_data()->has_class_mirror_holder()) {
3305 // For a non-strong hidden class defined to an unnamed package,
3306 // its (class held) CLD will not have an unnamed module created for it.
3307 // Two choices to find the correct ModuleEntry:
3308 // 1. If hidden class is within a nest, use nest host's module
3309 // 2. Find the unnamed module off from the class loader
3310 // For now option #2 is used since a nest host is not set until
3311 // after the instance class is created in jvm_lookup_define_class().
3312 if (class_loader_data()->is_boot_class_loader_data()) {
3313 return ClassLoaderData::the_null_class_loader_data()->unnamed_module();
3314 } else {
3315 oop module = java_lang_ClassLoader::unnamedModule(class_loader_data()->class_loader());
3316 assert(java_lang_Module::is_instance(module), "Not an instance of java.lang.Module");
3317 return java_lang_Module::module_entry(module);
3318 }
3319 }
3320
3321 // Class is in a named package
3322 if (!in_unnamed_package()) {
3323 return _package_entry->module();
3324 }
3325
3326 // Class is in an unnamed package, return its loader's unnamed module
3327 return class_loader_data()->unnamed_module();
3328 }
3329
3330 bool InstanceKlass::in_javabase_module() const {
3331 return module()->name() == vmSymbols::java_base();
3332 }
3333
3334 void InstanceKlass::set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS) {
3335
3336 // ensure java/ packages only loaded by boot or platform builtin loaders
3337 // not needed for shared class since CDS does not archive prohibited classes.
3338 if (!is_shared()) {
3339 check_prohibited_package(name(), loader_data, CHECK);
3340 }
3341
3342 if (is_shared() && _package_entry != nullptr) {
3343 if (CDSConfig::is_using_full_module_graph() && _package_entry == pkg_entry) {
3344 // we can use the saved package
3345 assert(MetaspaceShared::is_in_shared_metaspace(_package_entry), "must be");
3346 return;
3347 } else {
3348 _package_entry = nullptr;
3349 }
3350 }
3351
3352 // ClassLoader::package_from_class_name has already incremented the refcount of the symbol
3353 // it returns, so we need to decrement it when the current function exits.
3354 TempNewSymbol from_class_name =
3355 (pkg_entry != nullptr) ? nullptr : ClassLoader::package_from_class_name(name());
3356
3357 Symbol* pkg_name;
3358 if (pkg_entry != nullptr) {
3359 pkg_name = pkg_entry->name();
3360 } else {
3361 pkg_name = from_class_name;
3362 }
3363
3364 if (pkg_name != nullptr && loader_data != nullptr) {
3365
3366 // Find in class loader's package entry table.
3367 _package_entry = pkg_entry != nullptr ? pkg_entry : loader_data->packages()->lookup_only(pkg_name);
3368
3369 // If the package name is not found in the loader's package
3370 // entry table, it is an indication that the package has not
3371 // been defined. Consider it defined within the unnamed module.
3372 if (_package_entry == nullptr) {
3373
3374 if (!ModuleEntryTable::javabase_defined()) {
3375 // Before java.base is defined during bootstrapping, define all packages in
3376 // the java.base module. If a non-java.base package is erroneously placed
3377 // in the java.base module it will be caught later when java.base
3378 // is defined by ModuleEntryTable::verify_javabase_packages check.
3379 assert(ModuleEntryTable::javabase_moduleEntry() != nullptr, JAVA_BASE_NAME " module is null");
3380 _package_entry = loader_data->packages()->create_entry_if_absent(pkg_name, ModuleEntryTable::javabase_moduleEntry());
3381 } else {
3382 assert(loader_data->unnamed_module() != nullptr, "unnamed module is null");
3383 _package_entry = loader_data->packages()->create_entry_if_absent(pkg_name, loader_data->unnamed_module());
3384 }
3385
3386 // A package should have been successfully created
3387 DEBUG_ONLY(ResourceMark rm(THREAD));
3388 assert(_package_entry != nullptr, "Package entry for class %s not found, loader %s",
3389 name()->as_C_string(), loader_data->loader_name_and_id());
3390 }
3391
3392 if (log_is_enabled(Debug, module)) {
3393 ResourceMark rm(THREAD);
3394 ModuleEntry* m = _package_entry->module();
3395 log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s",
3396 external_name(),
3397 pkg_name->as_C_string(),
3398 loader_data->loader_name_and_id(),
3399 (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE));
3400 }
3401 } else {
3402 ResourceMark rm(THREAD);
3403 log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s",
3404 external_name(),
3405 (loader_data != nullptr) ? loader_data->loader_name_and_id() : "null",
3406 UNNAMED_MODULE);
3407 }
3408 }
3409
3410 // Function set_classpath_index ensures that for a non-null _package_entry
3411 // of the InstanceKlass, the entry is in the boot loader's package entry table.
3412 // It then sets the classpath_index in the package entry record.
3413 //
3414 // The classpath_index field is used to find the entry on the boot loader class
3415 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
3416 // in an unnamed module. It is also used to indicate (for all packages whose
3417 // classes are loaded by the boot loader) that at least one of the package's
3418 // classes has been loaded.
3419 void InstanceKlass::set_classpath_index(s2 path_index) {
3420 if (_package_entry != nullptr) {
3421 DEBUG_ONLY(PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();)
3422 assert(pkg_entry_tbl->lookup_only(_package_entry->name()) == _package_entry, "Should be same");
3423 assert(path_index != -1, "Unexpected classpath_index");
3424 _package_entry->set_classpath_index(path_index);
3425 }
3426 }
3427
3428 // different versions of is_same_class_package
3429
3430 bool InstanceKlass::is_same_class_package(const Klass* class2) const {
3431 oop classloader1 = this->class_loader();
3432 PackageEntry* classpkg1 = this->package();
3433 if (class2->is_objArray_klass()) {
3434 class2 = ObjArrayKlass::cast(class2)->bottom_klass();
3435 }
3436
3437 oop classloader2;
3438 PackageEntry* classpkg2;
3439 if (class2->is_instance_klass()) {
3440 classloader2 = class2->class_loader();
3441 classpkg2 = class2->package();
3442 } else {
3443 assert(class2->is_typeArray_klass(), "should be type array");
3444 classloader2 = nullptr;
3445 classpkg2 = nullptr;
3446 }
3447
3448 // Same package is determined by comparing class loader
3449 // and package entries. Both must be the same. This rule
3450 // applies even to classes that are defined in the unnamed
3451 // package, they still must have the same class loader.
3452 if ((classloader1 == classloader2) && (classpkg1 == classpkg2)) {
3453 return true;
3454 }
3455
3456 return false;
3457 }
3458
3459 // return true if this class and other_class are in the same package. Classloader
3460 // and classname information is enough to determine a class's package
3461 bool InstanceKlass::is_same_class_package(oop other_class_loader,
3462 const Symbol* other_class_name) const {
3463 if (class_loader() != other_class_loader) {
3464 return false;
3465 }
3466 if (name()->fast_compare(other_class_name) == 0) {
3467 return true;
3468 }
3469
3470 {
3471 ResourceMark rm;
3472
3473 bool bad_class_name = false;
3474 TempNewSymbol other_pkg = ClassLoader::package_from_class_name(other_class_name, &bad_class_name);
3475 if (bad_class_name) {
3476 return false;
3477 }
3478 // Check that package_from_class_name() returns null, not "", if there is no package.
3479 assert(other_pkg == nullptr || other_pkg->utf8_length() > 0, "package name is empty string");
3480
3481 const Symbol* const this_package_name =
3482 this->package() != nullptr ? this->package()->name() : nullptr;
3483
3484 if (this_package_name == nullptr || other_pkg == nullptr) {
3485 // One of the two doesn't have a package. Only return true if the other
3486 // one also doesn't have a package.
3487 return this_package_name == other_pkg;
3488 }
3489
3490 // Check if package is identical
3491 return this_package_name->fast_compare(other_pkg) == 0;
3492 }
3493 }
3494
3495 static bool is_prohibited_package_slow(Symbol* class_name) {
3496 // Caller has ResourceMark
3497 int length;
3498 jchar* unicode = class_name->as_unicode(length);
3499 return (length >= 5 &&
3500 unicode[0] == 'j' &&
3501 unicode[1] == 'a' &&
3502 unicode[2] == 'v' &&
3503 unicode[3] == 'a' &&
3504 unicode[4] == '/');
3505 }
3506
3507 // Only boot and platform class loaders can define classes in "java/" packages.
3508 void InstanceKlass::check_prohibited_package(Symbol* class_name,
3509 ClassLoaderData* loader_data,
3510 TRAPS) {
3511 if (!loader_data->is_boot_class_loader_data() &&
3512 !loader_data->is_platform_class_loader_data() &&
3513 class_name != nullptr && class_name->utf8_length() >= 5) {
3514 ResourceMark rm(THREAD);
3515 bool prohibited;
3516 const u1* base = class_name->base();
3517 if ((base[0] | base[1] | base[2] | base[3] | base[4]) & 0x80) {
3518 prohibited = is_prohibited_package_slow(class_name);
3519 } else {
3520 char* name = class_name->as_C_string();
3521 prohibited = (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/');
3522 }
3523 if (prohibited) {
3524 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name);
3525 assert(pkg_name != nullptr, "Error in parsing package name starting with 'java/'");
3526 char* name = pkg_name->as_C_string();
3527 const char* class_loader_name = loader_data->loader_name_and_id();
3528 StringUtils::replace_no_expand(name, "/", ".");
3529 const char* msg_text1 = "Class loader (instance of): ";
3530 const char* msg_text2 = " tried to load prohibited package name: ";
3531 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1;
3532 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
3533 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name);
3534 THROW_MSG(vmSymbols::java_lang_SecurityException(), message);
3535 }
3536 }
3537 return;
3538 }
3539
3540 bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const {
3541 constantPoolHandle i_cp(THREAD, constants());
3542 for (InnerClassesIterator iter(this); !iter.done(); iter.next()) {
3543 int ioff = iter.inner_class_info_index();
3544 if (ioff != 0) {
3545 // Check to see if the name matches the class we're looking for
3546 // before attempting to find the class.
3547 if (i_cp->klass_name_at_matches(this, ioff)) {
3548 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false);
3549 if (this == inner_klass) {
3550 *ooff = iter.outer_class_info_index();
3551 *noff = iter.inner_name_index();
3552 return true;
3553 }
3554 }
3555 }
3556 }
3557 return false;
3558 }
3559
3560 void InstanceKlass::check_can_be_annotated_with_NullRestricted(InstanceKlass* type, Symbol* container_klass_name, TRAPS) {
3561 assert(type->is_instance_klass(), "Sanity check");
3562 if (type->is_identity_class()) {
3563 ResourceMark rm(THREAD);
3564 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
3565 err_msg("Class %s expects class %s to be a value class, but it is an identity class",
3566 container_klass_name->as_C_string(),
3567 type->external_name()));
3568 }
3569
3570 if (type->is_abstract()) {
3571 ResourceMark rm(THREAD);
3572 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
3573 err_msg("Class %s expects class %s to be concrete value type, but it is an abstract class",
3574 container_klass_name->as_C_string(),
3575 type->external_name()));
3576 }
3577 }
3578
3579 InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const {
3580 InstanceKlass* outer_klass = nullptr;
3581 *inner_is_member = false;
3582 int ooff = 0, noff = 0;
3583 bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD);
3584 if (has_inner_classes_attr) {
3585 constantPoolHandle i_cp(THREAD, constants());
3586 if (ooff != 0) {
3587 Klass* ok = i_cp->klass_at(ooff, CHECK_NULL);
3588 if (!ok->is_instance_klass()) {
3589 // If the outer class is not an instance klass then it cannot have
3590 // declared any inner classes.
3591 ResourceMark rm(THREAD);
3592 // Names are all known to be < 64k so we know this formatted message is not excessively large.
3593 Exceptions::fthrow(
3594 THREAD_AND_LOCATION,
3595 vmSymbols::java_lang_IncompatibleClassChangeError(),
3596 "%s and %s disagree on InnerClasses attribute",
3597 ok->external_name(),
3598 external_name());
3599 return nullptr;
3600 }
3601 outer_klass = InstanceKlass::cast(ok);
3602 *inner_is_member = true;
3603 }
3604 if (nullptr == outer_klass) {
3605 // It may be a local class; try for that.
3606 int encl_method_class_idx = enclosing_method_class_index();
3607 if (encl_method_class_idx != 0) {
3608 Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
3609 outer_klass = InstanceKlass::cast(ok);
3610 *inner_is_member = false;
3611 }
3612 }
3613 }
3614
3615 // If no inner class attribute found for this class.
3616 if (nullptr == outer_klass) return nullptr;
3617
3618 // Throws an exception if outer klass has not declared k as an inner klass
3619 // We need evidence that each klass knows about the other, or else
3620 // the system could allow a spoof of an inner class to gain access rights.
3621 Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL);
3622 return outer_klass;
3623 }
3624
3625 u2 InstanceKlass::compute_modifier_flags() const {
3626 u2 access = access_flags().as_unsigned_short();
3627
3628 // But check if it happens to be member class.
3629 InnerClassesIterator iter(this);
3630 for (; !iter.done(); iter.next()) {
3631 int ioff = iter.inner_class_info_index();
3632 // Inner class attribute can be zero, skip it.
3633 // Strange but true: JVM spec. allows null inner class refs.
3634 if (ioff == 0) continue;
3635
3636 // only look at classes that are already loaded
3637 // since we are looking for the flags for our self.
3638 Symbol* inner_name = constants()->klass_name_at(ioff);
3639 if (name() == inner_name) {
3640 // This is really a member class.
3641 access = iter.inner_access_flags();
3642 break;
3643 }
3644 }
3645 return access;
3646 }
3647
3648 jint InstanceKlass::jvmti_class_status() const {
3649 jint result = 0;
3650
3651 if (is_linked()) {
3652 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
3653 }
3654
3655 if (is_initialized()) {
3656 assert(is_linked(), "Class status is not consistent");
3657 result |= JVMTI_CLASS_STATUS_INITIALIZED;
3658 }
3659 if (is_in_error_state()) {
3660 result |= JVMTI_CLASS_STATUS_ERROR;
3661 }
3662 return result;
3663 }
3664
3665 Method* InstanceKlass::method_at_itable(InstanceKlass* holder, int index, TRAPS) {
3666 bool implements_interface; // initialized by method_at_itable_or_null
3667 Method* m = method_at_itable_or_null(holder, index,
3668 implements_interface); // out parameter
3669 if (m != nullptr) {
3670 assert(implements_interface, "sanity");
3671 return m;
3672 } else if (implements_interface) {
3673 // Throw AbstractMethodError since corresponding itable slot is empty.
3674 THROW_NULL(vmSymbols::java_lang_AbstractMethodError());
3675 } else {
3676 // If the interface isn't implemented by the receiver class,
3677 // the VM should throw IncompatibleClassChangeError.
3678 ResourceMark rm(THREAD);
3679 stringStream ss;
3680 bool same_module = (module() == holder->module());
3681 ss.print("Receiver class %s does not implement "
3682 "the interface %s defining the method to be called "
3683 "(%s%s%s)",
3684 external_name(), holder->external_name(),
3685 (same_module) ? joint_in_module_of_loader(holder) : class_in_module_of_loader(),
3686 (same_module) ? "" : "; ",
3687 (same_module) ? "" : holder->class_in_module_of_loader());
3688 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
3689 }
3690 }
3691
3692 Method* InstanceKlass::method_at_itable_or_null(InstanceKlass* holder, int index, bool& implements_interface) {
3693 klassItable itable(this);
3694 for (int i = 0; i < itable.size_offset_table(); i++) {
3695 itableOffsetEntry* offset_entry = itable.offset_entry(i);
3696 if (offset_entry->interface_klass() == holder) {
3697 implements_interface = true;
3698 itableMethodEntry* ime = offset_entry->first_method_entry(this);
3699 Method* m = ime[index].method();
3700 return m;
3701 }
3702 }
3703 implements_interface = false;
3704 return nullptr; // offset entry not found
3705 }
3706
3707 int InstanceKlass::vtable_index_of_interface_method(Method* intf_method) {
3708 assert(is_linked(), "required");
3709 assert(intf_method->method_holder()->is_interface(), "not an interface method");
3710 assert(is_subtype_of(intf_method->method_holder()), "interface not implemented");
3711
3712 int vtable_index = Method::invalid_vtable_index;
3713 Symbol* name = intf_method->name();
3714 Symbol* signature = intf_method->signature();
3715
3716 // First check in default method array
3717 if (!intf_method->is_abstract() && default_methods() != nullptr) {
3718 int index = find_method_index(default_methods(),
3719 name, signature,
3720 Klass::OverpassLookupMode::find,
3721 Klass::StaticLookupMode::find,
3722 Klass::PrivateLookupMode::find);
3723 if (index >= 0) {
3724 vtable_index = default_vtable_indices()->at(index);
3725 }
3726 }
3727 if (vtable_index == Method::invalid_vtable_index) {
3728 // get vtable_index for miranda methods
3729 klassVtable vt = vtable();
3730 vtable_index = vt.index_of_miranda(name, signature);
3731 }
3732 return vtable_index;
3733 }
3734
3735 #if INCLUDE_JVMTI
3736 // update default_methods for redefineclasses for methods that are
3737 // not yet in the vtable due to concurrent subclass define and superinterface
3738 // redefinition
3739 // Note: those in the vtable, should have been updated via adjust_method_entries
3740 void InstanceKlass::adjust_default_methods(bool* trace_name_printed) {
3741 // search the default_methods for uses of either obsolete or EMCP methods
3742 if (default_methods() != nullptr) {
3743 for (int index = 0; index < default_methods()->length(); index ++) {
3744 Method* old_method = default_methods()->at(index);
3745 if (old_method == nullptr || !old_method->is_old()) {
3746 continue; // skip uninteresting entries
3747 }
3748 assert(!old_method->is_deleted(), "default methods may not be deleted");
3749 Method* new_method = old_method->get_new_method();
3750 default_methods()->at_put(index, new_method);
3751
3752 if (log_is_enabled(Info, redefine, class, update)) {
3753 ResourceMark rm;
3754 if (!(*trace_name_printed)) {
3755 log_info(redefine, class, update)
3756 ("adjust: klassname=%s default methods from name=%s",
3757 external_name(), old_method->method_holder()->external_name());
3758 *trace_name_printed = true;
3759 }
3760 log_debug(redefine, class, update, vtables)
3761 ("default method update: %s(%s) ",
3762 new_method->name()->as_C_string(), new_method->signature()->as_C_string());
3763 }
3764 }
3765 }
3766 }
3767 #endif // INCLUDE_JVMTI
3768
3769 // On-stack replacement stuff
3770 void InstanceKlass::add_osr_nmethod(nmethod* n) {
3771 assert_lock_strong(NMethodState_lock);
3772 #ifndef PRODUCT
3773 nmethod* prev = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), n->comp_level(), true);
3774 assert(prev == nullptr || !prev->is_in_use() COMPILER2_PRESENT(|| StressRecompilation),
3775 "redundant OSR recompilation detected. memory leak in CodeCache!");
3776 #endif
3777 // only one compilation can be active
3778 assert(n->is_osr_method(), "wrong kind of nmethod");
3779 n->set_osr_link(osr_nmethods_head());
3780 set_osr_nmethods_head(n);
3781 // Raise the highest osr level if necessary
3782 n->method()->set_highest_osr_comp_level(MAX2(n->method()->highest_osr_comp_level(), n->comp_level()));
3783
3784 // Get rid of the osr methods for the same bci that have lower levels.
3785 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) {
3786 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true);
3787 if (inv != nullptr && inv->is_in_use()) {
3788 inv->make_not_entrant(nmethod::InvalidationReason::OSR_INVALIDATION_OF_LOWER_LEVEL);
3789 }
3790 }
3791 }
3792
3793 // Remove osr nmethod from the list. Return true if found and removed.
3794 bool InstanceKlass::remove_osr_nmethod(nmethod* n) {
3795 // This is a short non-blocking critical region, so the no safepoint check is ok.
3796 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
3797 assert(n->is_osr_method(), "wrong kind of nmethod");
3798 nmethod* last = nullptr;
3799 nmethod* cur = osr_nmethods_head();
3800 int max_level = CompLevel_none; // Find the max comp level excluding n
3801 Method* m = n->method();
3802 // Search for match
3803 bool found = false;
3804 while(cur != nullptr && cur != n) {
3805 if (m == cur->method()) {
3806 // Find max level before n
3807 max_level = MAX2(max_level, cur->comp_level());
3808 }
3809 last = cur;
3810 cur = cur->osr_link();
3811 }
3812 nmethod* next = nullptr;
3813 if (cur == n) {
3814 found = true;
3815 next = cur->osr_link();
3816 if (last == nullptr) {
3817 // Remove first element
3818 set_osr_nmethods_head(next);
3819 } else {
3820 last->set_osr_link(next);
3821 }
3822 }
3823 n->set_osr_link(nullptr);
3824 cur = next;
3825 while (cur != nullptr) {
3826 // Find max level after n
3827 if (m == cur->method()) {
3828 max_level = MAX2(max_level, cur->comp_level());
3829 }
3830 cur = cur->osr_link();
3831 }
3832 m->set_highest_osr_comp_level(max_level);
3833 return found;
3834 }
3835
3836 int InstanceKlass::mark_osr_nmethods(DeoptimizationScope* deopt_scope, const Method* m) {
3837 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
3838 nmethod* osr = osr_nmethods_head();
3839 int found = 0;
3840 while (osr != nullptr) {
3841 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3842 if (osr->method() == m) {
3843 deopt_scope->mark(osr);
3844 found++;
3845 }
3846 osr = osr->osr_link();
3847 }
3848 return found;
3849 }
3850
3851 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
3852 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
3853 nmethod* osr = osr_nmethods_head();
3854 nmethod* best = nullptr;
3855 while (osr != nullptr) {
3856 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3857 // There can be a time when a c1 osr method exists but we are waiting
3858 // for a c2 version. When c2 completes its osr nmethod we will trash
3859 // the c1 version and only be able to find the c2 version. However
3860 // while we overflow in the c1 code at back branches we don't want to
3861 // try and switch to the same code as we are already running
3862
3863 if (osr->method() == m &&
3864 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
3865 if (match_level) {
3866 if (osr->comp_level() == comp_level) {
3867 // Found a match - return it.
3868 return osr;
3869 }
3870 } else {
3871 if (best == nullptr || (osr->comp_level() > best->comp_level())) {
3872 if (osr->comp_level() == CompilationPolicy::highest_compile_level()) {
3873 // Found the best possible - return it.
3874 return osr;
3875 }
3876 best = osr;
3877 }
3878 }
3879 }
3880 osr = osr->osr_link();
3881 }
3882
3883 assert(match_level == false || best == nullptr, "shouldn't pick up anything if match_level is set");
3884 if (best != nullptr && best->comp_level() >= comp_level) {
3885 return best;
3886 }
3887 return nullptr;
3888 }
3889
3890 // -----------------------------------------------------------------------------------------------------
3891 // Printing
3892
3893 #define BULLET " - "
3894
3895 static const char* state_names[] = {
3896 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
3897 };
3898
3899 static void print_vtable(address self, intptr_t* start, int len, outputStream* st) {
3900 ResourceMark rm;
3901 int* forward_refs = NEW_RESOURCE_ARRAY(int, len);
3902 for (int i = 0; i < len; i++) forward_refs[i] = 0;
3903 for (int i = 0; i < len; i++) {
3904 intptr_t e = start[i];
3905 st->print("%d : " INTPTR_FORMAT, i, e);
3906 if (forward_refs[i] != 0) {
3907 int from = forward_refs[i];
3908 int off = (int) start[from];
3909 st->print(" (offset %d <= [%d])", off, from);
3910 }
3911 if (MetaspaceObj::is_valid((Metadata*)e)) {
3912 st->print(" ");
3913 ((Metadata*)e)->print_value_on(st);
3914 } else if (self != nullptr && e > 0 && e < 0x10000) {
3915 address location = self + e;
3916 int index = (int)((intptr_t*)location - start);
3917 st->print(" (offset %d => [%d])", (int)e, index);
3918 if (index >= 0 && index < len)
3919 forward_refs[index] = i;
3920 }
3921 st->cr();
3922 }
3923 }
3924
3925 static void print_vtable(vtableEntry* start, int len, outputStream* st) {
3926 return print_vtable(nullptr, reinterpret_cast<intptr_t*>(start), len, st);
3927 }
3928
3929 template<typename T>
3930 static void print_array_on(outputStream* st, Array<T>* array) {
3931 if (array == nullptr) { st->print_cr("nullptr"); return; }
3932 array->print_value_on(st); st->cr();
3933 if (Verbose || WizardMode) {
3934 for (int i = 0; i < array->length(); i++) {
3935 st->print("%d : ", i); array->at(i)->print_value_on(st); st->cr();
3936 }
3937 }
3938 }
3939
3940 static void print_array_on(outputStream* st, Array<int>* array) {
3941 if (array == nullptr) { st->print_cr("nullptr"); return; }
3942 array->print_value_on(st); st->cr();
3943 if (Verbose || WizardMode) {
3944 for (int i = 0; i < array->length(); i++) {
3945 st->print("%d : %d", i, array->at(i)); st->cr();
3946 }
3947 }
3948 }
3949
3950 const char* InstanceKlass::init_state_name() const {
3951 return state_names[init_state()];
3952 }
3953
3954 void InstanceKlass::print_on(outputStream* st) const {
3955 assert(is_klass(), "must be klass");
3956 Klass::print_on(st);
3957
3958 st->print(BULLET"instance size: %d", size_helper()); st->cr();
3959 st->print(BULLET"klass size: %d", size()); st->cr();
3960 st->print(BULLET"access: "); access_flags().print_on(st); st->cr();
3961 st->print(BULLET"flags: "); _misc_flags.print_on(st); st->cr();
3962 st->print(BULLET"state: "); st->print_cr("%s", init_state_name());
3963 st->print(BULLET"name: "); name()->print_value_on(st); st->cr();
3964 st->print(BULLET"super: "); Metadata::print_value_on_maybe_null(st, super()); st->cr();
3965 st->print(BULLET"sub: ");
3966 Klass* sub = subklass();
3967 int n;
3968 for (n = 0; sub != nullptr; n++, sub = sub->next_sibling()) {
3969 if (n < MaxSubklassPrintSize) {
3970 sub->print_value_on(st);
3971 st->print(" ");
3972 }
3973 }
3974 if (n >= MaxSubklassPrintSize) st->print("(%zd more klasses...)", n - MaxSubklassPrintSize);
3975 st->cr();
3976
3977 if (is_interface()) {
3978 st->print_cr(BULLET"nof implementors: %d", nof_implementors());
3979 if (nof_implementors() == 1) {
3980 st->print_cr(BULLET"implementor: ");
3981 st->print(" ");
3982 implementor()->print_value_on(st);
3983 st->cr();
3984 }
3985 }
3986
3987 st->print(BULLET"arrays: "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr();
3988 st->print(BULLET"methods: "); print_array_on(st, methods());
3989 st->print(BULLET"method ordering: "); print_array_on(st, method_ordering());
3990 if (default_methods() != nullptr) {
3991 st->print(BULLET"default_methods: "); print_array_on(st, default_methods());
3992 }
3993 print_on_maybe_null(st, BULLET"default vtable indices: ", default_vtable_indices());
3994 st->print(BULLET"local interfaces: "); local_interfaces()->print_value_on(st); st->cr();
3995 st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr();
3996
3997 st->print(BULLET"secondary supers: "); secondary_supers()->print_value_on(st); st->cr();
3998
3999 st->print(BULLET"hash_slot: %d", hash_slot()); st->cr();
4000 st->print(BULLET"secondary bitmap: " UINTX_FORMAT_X_0, _secondary_supers_bitmap); st->cr();
4001
4002 if (secondary_supers() != nullptr) {
4003 if (Verbose) {
4004 bool is_hashed = (_secondary_supers_bitmap != SECONDARY_SUPERS_BITMAP_FULL);
4005 st->print_cr(BULLET"---- secondary supers (%d words):", _secondary_supers->length());
4006 for (int i = 0; i < _secondary_supers->length(); i++) {
4007 ResourceMark rm; // for external_name()
4008 Klass* secondary_super = _secondary_supers->at(i);
4009 st->print(BULLET"%2d:", i);
4010 if (is_hashed) {
4011 int home_slot = compute_home_slot(secondary_super, _secondary_supers_bitmap);
4012 int distance = (i - home_slot) & SECONDARY_SUPERS_TABLE_MASK;
4013 st->print(" dist:%02d:", distance);
4014 }
4015 st->print_cr(" %p %s", secondary_super, secondary_super->external_name());
4016 }
4017 }
4018 }
4019 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr();
4020
4021 print_on_maybe_null(st, BULLET"class loader data: ", class_loader_data());
4022 print_on_maybe_null(st, BULLET"source file: ", source_file_name());
4023 if (source_debug_extension() != nullptr) {
4024 st->print(BULLET"source debug extension: ");
4025 st->print("%s", source_debug_extension());
4026 st->cr();
4027 }
4028 print_on_maybe_null(st, BULLET"class annotations: ", class_annotations());
4029 print_on_maybe_null(st, BULLET"class type annotations: ", class_type_annotations());
4030 print_on_maybe_null(st, BULLET"field annotations: ", fields_annotations());
4031 print_on_maybe_null(st, BULLET"field type annotations: ", fields_type_annotations());
4032 {
4033 bool have_pv = false;
4034 // previous versions are linked together through the InstanceKlass
4035 for (InstanceKlass* pv_node = previous_versions();
4036 pv_node != nullptr;
4037 pv_node = pv_node->previous_versions()) {
4038 if (!have_pv)
4039 st->print(BULLET"previous version: ");
4040 have_pv = true;
4041 pv_node->constants()->print_value_on(st);
4042 }
4043 if (have_pv) st->cr();
4044 }
4045
4046 print_on_maybe_null(st, BULLET"generic signature: ", generic_signature());
4047 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr();
4048 st->print(BULLET"nest members: "); nest_members()->print_value_on(st); st->cr();
4049 print_on_maybe_null(st, BULLET"record components: ", record_components());
4050 st->print(BULLET"permitted subclasses: "); permitted_subclasses()->print_value_on(st); st->cr();
4051 st->print(BULLET"loadable descriptors: "); loadable_descriptors()->print_value_on(st); st->cr();
4052 if (java_mirror() != nullptr) {
4053 st->print(BULLET"java mirror: ");
4054 java_mirror()->print_value_on(st);
4055 st->cr();
4056 } else {
4057 st->print_cr(BULLET"java mirror: null");
4058 }
4059 st->print(BULLET"vtable length %d (start addr: " PTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
4060 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st);
4061 st->print(BULLET"itable length %d (start addr: " PTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
4062 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(nullptr, start_of_itable(), itable_length(), st);
4063 st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
4064
4065 FieldPrinter print_static_field(st);
4066 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
4067 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
4068 FieldPrinter print_nonstatic_field(st);
4069 InstanceKlass* ik = const_cast<InstanceKlass*>(this);
4070 ik->print_nonstatic_fields(&print_nonstatic_field);
4071
4072 st->print(BULLET"non-static oop maps (%d entries): ", nonstatic_oop_map_count());
4073 OopMapBlock* map = start_of_nonstatic_oop_maps();
4074 OopMapBlock* end_map = map + nonstatic_oop_map_count();
4075 while (map < end_map) {
4076 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
4077 map++;
4078 }
4079 st->cr();
4080
4081 if (fieldinfo_search_table() != nullptr) {
4082 st->print_cr(BULLET"---- field info search table:");
4083 FieldInfoStream::print_search_table(st, _constants, _fieldinfo_stream, _fieldinfo_search_table);
4084 }
4085 }
4086
4087 void InstanceKlass::print_value_on(outputStream* st) const {
4088 assert(is_klass(), "must be klass");
4089 if (Verbose || WizardMode) access_flags().print_on(st);
4090 name()->print_value_on(st);
4091 }
4092
4093 void FieldPrinter::do_field(fieldDescriptor* fd) {
4094 for (int i = 0; i < _indent; i++) _st->print(" ");
4095 _st->print(BULLET);
4096 if (_obj == nullptr) {
4097 fd->print_on(_st, _base_offset);
4098 _st->cr();
4099 } else {
4100 fd->print_on_for(_st, _obj, _indent, _base_offset);
4101 if (!fd->field_flags().is_flat()) _st->cr();
4102 }
4103 }
4104
4105
4106 void InstanceKlass::oop_print_on(oop obj, outputStream* st, int indent, int base_offset) {
4107 Klass::oop_print_on(obj, st);
4108
4109 if (this == vmClasses::String_klass()) {
4110 typeArrayOop value = java_lang_String::value(obj);
4111 juint length = java_lang_String::length(obj);
4112 if (value != nullptr &&
4113 value->is_typeArray() &&
4114 length <= (juint) value->length()) {
4115 st->print(BULLET"string: ");
4116 java_lang_String::print(obj, st);
4117 st->cr();
4118 }
4119 }
4120
4121 st->print_cr(BULLET"---- fields (total size %zu words):", oop_size(obj));
4122 FieldPrinter print_field(st, obj, indent, base_offset);
4123 print_nonstatic_fields(&print_field);
4124
4125 if (this == vmClasses::Class_klass()) {
4126 st->print(BULLET"signature: ");
4127 java_lang_Class::print_signature(obj, st);
4128 st->cr();
4129 Klass* real_klass = java_lang_Class::as_Klass(obj);
4130 if (real_klass != nullptr && real_klass->is_instance_klass()) {
4131 st->print_cr(BULLET"---- static fields (%d):", java_lang_Class::static_oop_field_count(obj));
4132 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
4133 }
4134 } else if (this == vmClasses::MethodType_klass()) {
4135 st->print(BULLET"signature: ");
4136 java_lang_invoke_MethodType::print_signature(obj, st);
4137 st->cr();
4138 }
4139 }
4140
4141 #ifndef PRODUCT
4142
4143 bool InstanceKlass::verify_itable_index(int i) {
4144 int method_count = klassItable::method_count_for_interface(this);
4145 assert(i >= 0 && i < method_count, "index out of bounds");
4146 return true;
4147 }
4148
4149 #endif //PRODUCT
4150
4151 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
4152 st->print("a ");
4153 name()->print_value_on(st);
4154 obj->print_address_on(st);
4155 if (this == vmClasses::String_klass()
4156 && java_lang_String::value(obj) != nullptr) {
4157 ResourceMark rm;
4158 int len = java_lang_String::length(obj);
4159 int plen = (len < 24 ? len : 12);
4160 char* str = java_lang_String::as_utf8_string(obj, 0, plen);
4161 st->print(" = \"%s\"", str);
4162 if (len > plen)
4163 st->print("...[%d]", len);
4164 } else if (this == vmClasses::Class_klass()) {
4165 Klass* k = java_lang_Class::as_Klass(obj);
4166 st->print(" = ");
4167 if (k != nullptr) {
4168 k->print_value_on(st);
4169 } else {
4170 const char* tname = type2name(java_lang_Class::primitive_type(obj));
4171 st->print("%s", tname ? tname : "type?");
4172 }
4173 } else if (this == vmClasses::MethodType_klass()) {
4174 st->print(" = ");
4175 java_lang_invoke_MethodType::print_signature(obj, st);
4176 } else if (java_lang_boxing_object::is_instance(obj)) {
4177 st->print(" = ");
4178 java_lang_boxing_object::print(obj, st);
4179 } else if (this == vmClasses::LambdaForm_klass()) {
4180 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
4181 if (vmentry != nullptr) {
4182 st->print(" => ");
4183 vmentry->print_value_on(st);
4184 }
4185 } else if (this == vmClasses::MemberName_klass()) {
4186 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
4187 if (vmtarget != nullptr) {
4188 st->print(" = ");
4189 vmtarget->print_value_on(st);
4190 } else {
4191 oop clazz = java_lang_invoke_MemberName::clazz(obj);
4192 oop name = java_lang_invoke_MemberName::name(obj);
4193 if (clazz != nullptr) {
4194 clazz->print_value_on(st);
4195 } else {
4196 st->print("null");
4197 }
4198 st->print(".");
4199 if (name != nullptr) {
4200 name->print_value_on(st);
4201 } else {
4202 st->print("null");
4203 }
4204 }
4205 }
4206 }
4207
4208 const char* InstanceKlass::internal_name() const {
4209 return external_name();
4210 }
4211
4212 void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data,
4213 const ModuleEntry* module_entry,
4214 const ClassFileStream* cfs) const {
4215
4216 if (ClassListWriter::is_enabled()) {
4217 ClassListWriter::write(this, cfs);
4218 }
4219
4220 print_class_load_helper(loader_data, module_entry, cfs);
4221 print_class_load_cause_logging();
4222 }
4223
4224 void InstanceKlass::print_class_load_helper(ClassLoaderData* loader_data,
4225 const ModuleEntry* module_entry,
4226 const ClassFileStream* cfs) const {
4227
4228 if (!log_is_enabled(Info, class, load)) {
4229 return;
4230 }
4231
4232 ResourceMark rm;
4233 LogMessage(class, load) msg;
4234 stringStream info_stream;
4235
4236 // Name and class hierarchy info
4237 info_stream.print("%s", external_name());
4238
4239 // Source
4240 if (cfs != nullptr) {
4241 if (cfs->source() != nullptr) {
4242 const char* module_name = (module_entry->name() == nullptr) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
4243 if (module_name != nullptr) {
4244 // When the boot loader created the stream, it didn't know the module name
4245 // yet. Let's format it now.
4246 if (cfs->from_boot_loader_modules_image()) {
4247 info_stream.print(" source: jrt:/%s", module_name);
4248 } else {
4249 info_stream.print(" source: %s", cfs->source());
4250 }
4251 } else {
4252 info_stream.print(" source: %s", cfs->source());
4253 }
4254 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) {
4255 Thread* current = Thread::current();
4256 Klass* caller = current->is_Java_thread() ?
4257 JavaThread::cast(current)->security_get_caller_class(1):
4258 nullptr;
4259 // caller can be null, for example, during a JVMTI VM_Init hook
4260 if (caller != nullptr) {
4261 info_stream.print(" source: instance of %s", caller->external_name());
4262 } else {
4263 // source is unknown
4264 }
4265 } else {
4266 oop class_loader = loader_data->class_loader();
4267 info_stream.print(" source: %s", class_loader->klass()->external_name());
4268 }
4269 } else {
4270 assert(this->is_shared(), "must be");
4271 if (MetaspaceShared::is_shared_dynamic((void*)this)) {
4272 info_stream.print(" source: shared objects file (top)");
4273 } else {
4274 info_stream.print(" source: shared objects file");
4275 }
4276 }
4277
4278 msg.info("%s", info_stream.as_string());
4279
4280 if (log_is_enabled(Debug, class, load)) {
4281 stringStream debug_stream;
4282
4283 // Class hierarchy info
4284 debug_stream.print(" klass: " PTR_FORMAT " super: " PTR_FORMAT,
4285 p2i(this), p2i(superklass()));
4286
4287 // Interfaces
4288 if (local_interfaces() != nullptr && local_interfaces()->length() > 0) {
4289 debug_stream.print(" interfaces:");
4290 int length = local_interfaces()->length();
4291 for (int i = 0; i < length; i++) {
4292 debug_stream.print(" " PTR_FORMAT,
4293 p2i(InstanceKlass::cast(local_interfaces()->at(i))));
4294 }
4295 }
4296
4297 // Class loader
4298 debug_stream.print(" loader: [");
4299 loader_data->print_value_on(&debug_stream);
4300 debug_stream.print("]");
4301
4302 // Classfile checksum
4303 if (cfs) {
4304 debug_stream.print(" bytes: %d checksum: %08x",
4305 cfs->length(),
4306 ClassLoader::crc32(0, (const char*)cfs->buffer(),
4307 cfs->length()));
4308 }
4309
4310 msg.debug("%s", debug_stream.as_string());
4311 }
4312 }
4313
4314 void InstanceKlass::print_class_load_cause_logging() const {
4315 bool log_cause_native = log_is_enabled(Info, class, load, cause, native);
4316 if (log_cause_native || log_is_enabled(Info, class, load, cause)) {
4317 JavaThread* current = JavaThread::current();
4318 ResourceMark rm(current);
4319 const char* name = external_name();
4320
4321 if (LogClassLoadingCauseFor == nullptr ||
4322 (strcmp("*", LogClassLoadingCauseFor) != 0 &&
4323 strstr(name, LogClassLoadingCauseFor) == nullptr)) {
4324 return;
4325 }
4326
4327 // Log Java stack first
4328 {
4329 LogMessage(class, load, cause) msg;
4330 NonInterleavingLogStream info_stream{LogLevelType::Info, msg};
4331
4332 info_stream.print_cr("Java stack when loading %s:", name);
4333 current->print_stack_on(&info_stream);
4334 }
4335
4336 // Log native stack second
4337 if (log_cause_native) {
4338 // Log to string first so that lines can be indented
4339 stringStream stack_stream;
4340 char buf[O_BUFLEN];
4341 address lastpc = nullptr;
4342 NativeStackPrinter nsp(current);
4343 nsp.print_stack(&stack_stream, buf, sizeof(buf), lastpc,
4344 true /* print_source_info */, -1 /* max stack */);
4345
4346 LogMessage(class, load, cause, native) msg;
4347 NonInterleavingLogStream info_stream{LogLevelType::Info, msg};
4348 info_stream.print_cr("Native stack when loading %s:", name);
4349
4350 // Print each native stack line to the log
4351 int size = (int) stack_stream.size();
4352 char* stack = stack_stream.as_string();
4353 char* stack_end = stack + size;
4354 char* line_start = stack;
4355 for (char* p = stack; p < stack_end; p++) {
4356 if (*p == '\n') {
4357 *p = '\0';
4358 info_stream.print_cr("\t%s", line_start);
4359 line_start = p + 1;
4360 }
4361 }
4362 if (line_start < stack_end) {
4363 info_stream.print_cr("\t%s", line_start);
4364 }
4365 }
4366 }
4367 }
4368
4369 // Verification
4370
4371 class VerifyFieldClosure: public BasicOopIterateClosure {
4372 protected:
4373 template <class T> void do_oop_work(T* p) {
4374 oop obj = RawAccess<>::oop_load(p);
4375 if (!oopDesc::is_oop_or_null(obj)) {
4376 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj));
4377 Universe::print_on(tty);
4378 guarantee(false, "boom");
4379 }
4380 }
4381 public:
4382 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); }
4383 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
4384 };
4385
4386 void InstanceKlass::verify_on(outputStream* st) {
4387 #ifndef PRODUCT
4388 // Avoid redundant verifies, this really should be in product.
4389 if (_verify_count == Universe::verify_count()) return;
4390 _verify_count = Universe::verify_count();
4391 #endif
4392
4393 // Verify Klass
4394 Klass::verify_on(st);
4395
4396 // Verify that klass is present in ClassLoaderData
4397 guarantee(class_loader_data()->contains_klass(this),
4398 "this class isn't found in class loader data");
4399
4400 // Verify vtables
4401 if (is_linked()) {
4402 // $$$ This used to be done only for m/s collections. Doing it
4403 // always seemed a valid generalization. (DLD -- 6/00)
4404 vtable().verify(st);
4405 }
4406
4407 // Verify first subklass
4408 if (subklass() != nullptr) {
4409 guarantee(subklass()->is_klass(), "should be klass");
4410 }
4411
4412 // Verify siblings
4413 Klass* super = this->super();
4414 Klass* sib = next_sibling();
4415 if (sib != nullptr) {
4416 if (sib == this) {
4417 fatal("subclass points to itself " PTR_FORMAT, p2i(sib));
4418 }
4419
4420 guarantee(sib->is_klass(), "should be klass");
4421 guarantee(sib->super() == super, "siblings should have same superklass");
4422 }
4423
4424 // Verify local interfaces
4425 if (local_interfaces()) {
4426 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
4427 for (int j = 0; j < local_interfaces->length(); j++) {
4428 InstanceKlass* e = local_interfaces->at(j);
4429 guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
4430 }
4431 }
4432
4433 // Verify transitive interfaces
4434 if (transitive_interfaces() != nullptr) {
4435 Array<InstanceKlass*>* transitive_interfaces = this->transitive_interfaces();
4436 for (int j = 0; j < transitive_interfaces->length(); j++) {
4437 InstanceKlass* e = transitive_interfaces->at(j);
4438 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
4439 }
4440 }
4441
4442 // Verify methods
4443 if (methods() != nullptr) {
4444 Array<Method*>* methods = this->methods();
4445 for (int j = 0; j < methods->length(); j++) {
4446 guarantee(methods->at(j)->is_method(), "non-method in methods array");
4447 }
4448 for (int j = 0; j < methods->length() - 1; j++) {
4449 Method* m1 = methods->at(j);
4450 Method* m2 = methods->at(j + 1);
4451 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
4452 }
4453 }
4454
4455 // Verify method ordering
4456 if (method_ordering() != nullptr) {
4457 Array<int>* method_ordering = this->method_ordering();
4458 int length = method_ordering->length();
4459 if (JvmtiExport::can_maintain_original_method_order() ||
4460 ((CDSConfig::is_using_archive() || CDSConfig::is_dumping_archive()) && length != 0)) {
4461 guarantee(length == methods()->length(), "invalid method ordering length");
4462 jlong sum = 0;
4463 for (int j = 0; j < length; j++) {
4464 int original_index = method_ordering->at(j);
4465 guarantee(original_index >= 0, "invalid method ordering index");
4466 guarantee(original_index < length, "invalid method ordering index");
4467 sum += original_index;
4468 }
4469 // Verify sum of indices 0,1,...,length-1
4470 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
4471 } else {
4472 guarantee(length == 0, "invalid method ordering length");
4473 }
4474 }
4475
4476 // Verify default methods
4477 if (default_methods() != nullptr) {
4478 Array<Method*>* methods = this->default_methods();
4479 for (int j = 0; j < methods->length(); j++) {
4480 guarantee(methods->at(j)->is_method(), "non-method in methods array");
4481 }
4482 for (int j = 0; j < methods->length() - 1; j++) {
4483 Method* m1 = methods->at(j);
4484 Method* m2 = methods->at(j + 1);
4485 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
4486 }
4487 }
4488
4489 // Verify JNI static field identifiers
4490 if (jni_ids() != nullptr) {
4491 jni_ids()->verify(this);
4492 }
4493
4494 // Verify other fields
4495 if (constants() != nullptr) {
4496 guarantee(constants()->is_constantPool(), "should be constant pool");
4497 }
4498 }
4499
4500 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
4501 Klass::oop_verify_on(obj, st);
4502 VerifyFieldClosure blk;
4503 obj->oop_iterate(&blk);
4504 }
4505
4506
4507 // JNIid class for jfieldIDs only
4508 // Note to reviewers:
4509 // These JNI functions are just moved over to column 1 and not changed
4510 // in the compressed oops workspace.
4511 JNIid::JNIid(Klass* holder, int offset, JNIid* next) {
4512 _holder = holder;
4513 _offset = offset;
4514 _next = next;
4515 DEBUG_ONLY(_is_static_field_id = false;)
4516 }
4517
4518
4519 JNIid* JNIid::find(int offset) {
4520 JNIid* current = this;
4521 while (current != nullptr) {
4522 if (current->offset() == offset) return current;
4523 current = current->next();
4524 }
4525 return nullptr;
4526 }
4527
4528 void JNIid::deallocate(JNIid* current) {
4529 while (current != nullptr) {
4530 JNIid* next = current->next();
4531 delete current;
4532 current = next;
4533 }
4534 }
4535
4536
4537 void JNIid::verify(Klass* holder) {
4538 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields();
4539 int end_field_offset;
4540 end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize);
4541
4542 JNIid* current = this;
4543 while (current != nullptr) {
4544 guarantee(current->holder() == holder, "Invalid klass in JNIid");
4545 #ifdef ASSERT
4546 int o = current->offset();
4547 if (current->is_static_field_id()) {
4548 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid");
4549 }
4550 #endif
4551 current = current->next();
4552 }
4553 }
4554
4555 void InstanceKlass::set_init_state(ClassState state) {
4556 #ifdef ASSERT
4557 bool good_state = is_shared() ? (_init_state <= state)
4558 : (_init_state < state);
4559 assert(good_state || state == allocated, "illegal state transition");
4560 #endif
4561 assert(_init_thread == nullptr, "should be cleared before state change");
4562 Atomic::release_store(&_init_state, state);
4563 }
4564
4565 #if INCLUDE_JVMTI
4566
4567 // RedefineClasses() support for previous versions
4568
4569 // Globally, there is at least one previous version of a class to walk
4570 // during class unloading, which is saved because old methods in the class
4571 // are still running. Otherwise the previous version list is cleaned up.
4572 bool InstanceKlass::_should_clean_previous_versions = false;
4573
4574 // Returns true if there are previous versions of a class for class
4575 // unloading only. Also resets the flag to false. purge_previous_version
4576 // will set the flag to true if there are any left, i.e., if there's any
4577 // work to do for next time. This is to avoid the expensive code cache
4578 // walk in CLDG::clean_deallocate_lists().
4579 bool InstanceKlass::should_clean_previous_versions_and_reset() {
4580 bool ret = _should_clean_previous_versions;
4581 log_trace(redefine, class, iklass, purge)("Class unloading: should_clean_previous_versions = %s",
4582 ret ? "true" : "false");
4583 _should_clean_previous_versions = false;
4584 return ret;
4585 }
4586
4587 // This nulls out the jmethodID for all obsolete methods in the previous version of the 'klass'.
4588 // These obsolete methods only exist in the previous version and we're about to delete the memory for them.
4589 // The jmethodID for these are deallocated when we unload the class, so this doesn't remove them from the table.
4590 void InstanceKlass::clear_obsolete_jmethod_ids(InstanceKlass* klass) {
4591 Array<Method*>* method_refs = klass->methods();
4592 for (int k = 0; k < method_refs->length(); k++) {
4593 Method* method = method_refs->at(k);
4594 // Only need to clear obsolete methods.
4595 if (method != nullptr && method->is_obsolete()) {
4596 method->clear_jmethod_id();
4597 }
4598 }
4599 }
4600
4601 // Purge previous versions before adding new previous versions of the class and
4602 // during class unloading.
4603 void InstanceKlass::purge_previous_version_list() {
4604 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
4605 assert(has_been_redefined(), "Should only be called for main class");
4606
4607 // Quick exit.
4608 if (previous_versions() == nullptr) {
4609 return;
4610 }
4611
4612 // This klass has previous versions so see what we can cleanup
4613 // while it is safe to do so.
4614
4615 int deleted_count = 0; // leave debugging breadcrumbs
4616 int live_count = 0;
4617 ClassLoaderData* loader_data = class_loader_data();
4618 assert(loader_data != nullptr, "should never be null");
4619
4620 ResourceMark rm;
4621 log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name());
4622
4623 // previous versions are linked together through the InstanceKlass
4624 InstanceKlass* pv_node = previous_versions();
4625 InstanceKlass* last = this;
4626 int version = 0;
4627
4628 // check the previous versions list
4629 for (; pv_node != nullptr; ) {
4630
4631 ConstantPool* pvcp = pv_node->constants();
4632 assert(pvcp != nullptr, "cp ref was unexpectedly cleared");
4633
4634 if (!pvcp->on_stack()) {
4635 // If the constant pool isn't on stack, none of the methods
4636 // are executing. Unlink this previous_version.
4637 // The previous version InstanceKlass is on the ClassLoaderData deallocate list
4638 // so will be deallocated during the next phase of class unloading.
4639 log_trace(redefine, class, iklass, purge)
4640 ("previous version " PTR_FORMAT " is dead.", p2i(pv_node));
4641 // Unlink from previous version list.
4642 assert(pv_node->class_loader_data() == loader_data, "wrong loader_data");
4643 InstanceKlass* next = pv_node->previous_versions();
4644 clear_obsolete_jmethod_ids(pv_node); // jmethodID maintenance for the unloaded class
4645 pv_node->link_previous_versions(nullptr); // point next to null
4646 last->link_previous_versions(next);
4647 // Delete this node directly. Nothing is referring to it and we don't
4648 // want it to increase the counter for metadata to delete in CLDG.
4649 MetadataFactory::free_metadata(loader_data, pv_node);
4650 pv_node = next;
4651 deleted_count++;
4652 version++;
4653 continue;
4654 } else {
4655 assert(pvcp->pool_holder() != nullptr, "Constant pool with no holder");
4656 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
4657 live_count++;
4658 if (pvcp->is_shared()) {
4659 // Shared previous versions can never be removed so no cleaning is needed.
4660 log_trace(redefine, class, iklass, purge)("previous version " PTR_FORMAT " is shared", p2i(pv_node));
4661 } else {
4662 // Previous version alive, set that clean is needed for next time.
4663 _should_clean_previous_versions = true;
4664 log_trace(redefine, class, iklass, purge)("previous version " PTR_FORMAT " is alive", p2i(pv_node));
4665 }
4666 }
4667
4668 // next previous version
4669 last = pv_node;
4670 pv_node = pv_node->previous_versions();
4671 version++;
4672 }
4673 log_trace(redefine, class, iklass, purge)
4674 ("previous version stats: live=%d, deleted=%d", live_count, deleted_count);
4675 }
4676
4677 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods,
4678 int emcp_method_count) {
4679 int obsolete_method_count = old_methods->length() - emcp_method_count;
4680
4681 if (emcp_method_count != 0 && obsolete_method_count != 0 &&
4682 _previous_versions != nullptr) {
4683 // We have a mix of obsolete and EMCP methods so we have to
4684 // clear out any matching EMCP method entries the hard way.
4685 int local_count = 0;
4686 for (int i = 0; i < old_methods->length(); i++) {
4687 Method* old_method = old_methods->at(i);
4688 if (old_method->is_obsolete()) {
4689 // only obsolete methods are interesting
4690 Symbol* m_name = old_method->name();
4691 Symbol* m_signature = old_method->signature();
4692
4693 // previous versions are linked together through the InstanceKlass
4694 int j = 0;
4695 for (InstanceKlass* prev_version = _previous_versions;
4696 prev_version != nullptr;
4697 prev_version = prev_version->previous_versions(), j++) {
4698
4699 Array<Method*>* method_refs = prev_version->methods();
4700 for (int k = 0; k < method_refs->length(); k++) {
4701 Method* method = method_refs->at(k);
4702
4703 if (!method->is_obsolete() &&
4704 method->name() == m_name &&
4705 method->signature() == m_signature) {
4706 // The current RedefineClasses() call has made all EMCP
4707 // versions of this method obsolete so mark it as obsolete
4708 log_trace(redefine, class, iklass, add)
4709 ("%s(%s): flush obsolete method @%d in version @%d",
4710 m_name->as_C_string(), m_signature->as_C_string(), k, j);
4711
4712 method->set_is_obsolete();
4713 break;
4714 }
4715 }
4716
4717 // The previous loop may not find a matching EMCP method, but
4718 // that doesn't mean that we can optimize and not go any
4719 // further back in the PreviousVersion generations. The EMCP
4720 // method for this generation could have already been made obsolete,
4721 // but there still may be an older EMCP method that has not
4722 // been made obsolete.
4723 }
4724
4725 if (++local_count >= obsolete_method_count) {
4726 // no more obsolete methods so bail out now
4727 break;
4728 }
4729 }
4730 }
4731 }
4732 }
4733
4734 // Save the scratch_class as the previous version if any of the methods are running.
4735 // The previous_versions are used to set breakpoints in EMCP methods and they are
4736 // also used to clean MethodData links to redefined methods that are no longer running.
4737 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class,
4738 int emcp_method_count) {
4739 assert(Thread::current()->is_VM_thread(),
4740 "only VMThread can add previous versions");
4741
4742 ResourceMark rm;
4743 log_trace(redefine, class, iklass, add)
4744 ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count);
4745
4746 // Clean out old previous versions for this class
4747 purge_previous_version_list();
4748
4749 // Mark newly obsolete methods in remaining previous versions. An EMCP method from
4750 // a previous redefinition may be made obsolete by this redefinition.
4751 Array<Method*>* old_methods = scratch_class->methods();
4752 mark_newly_obsolete_methods(old_methods, emcp_method_count);
4753
4754 // If the constant pool for this previous version of the class
4755 // is not marked as being on the stack, then none of the methods
4756 // in this previous version of the class are on the stack so
4757 // we don't need to add this as a previous version.
4758 ConstantPool* cp_ref = scratch_class->constants();
4759 if (!cp_ref->on_stack()) {
4760 log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running");
4761 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class);
4762 return;
4763 }
4764
4765 // Add previous version if any methods are still running or if this is
4766 // a shared class which should never be removed.
4767 assert(scratch_class->previous_versions() == nullptr, "shouldn't have a previous version");
4768 scratch_class->link_previous_versions(previous_versions());
4769 link_previous_versions(scratch_class);
4770 if (cp_ref->is_shared()) {
4771 log_trace(redefine, class, iklass, add) ("scratch class added; class is shared");
4772 } else {
4773 // We only set clean_previous_versions flag for processing during class
4774 // unloading for non-shared classes.
4775 _should_clean_previous_versions = true;
4776 log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack.");
4777 }
4778 } // end add_previous_version()
4779
4780 #endif // INCLUDE_JVMTI
4781
4782 Method* InstanceKlass::method_with_idnum(int idnum) const {
4783 Method* m = nullptr;
4784 if (idnum < methods()->length()) {
4785 m = methods()->at(idnum);
4786 }
4787 if (m == nullptr || m->method_idnum() != idnum) {
4788 for (int index = 0; index < methods()->length(); ++index) {
4789 m = methods()->at(index);
4790 if (m->method_idnum() == idnum) {
4791 return m;
4792 }
4793 }
4794 // None found, return null for the caller to handle.
4795 return nullptr;
4796 }
4797 return m;
4798 }
4799
4800
4801 Method* InstanceKlass::method_with_orig_idnum(int idnum) const {
4802 if (idnum >= methods()->length()) {
4803 return nullptr;
4804 }
4805 Method* m = methods()->at(idnum);
4806 if (m != nullptr && m->orig_method_idnum() == idnum) {
4807 return m;
4808 }
4809 // Obsolete method idnum does not match the original idnum
4810 for (int index = 0; index < methods()->length(); ++index) {
4811 m = methods()->at(index);
4812 if (m->orig_method_idnum() == idnum) {
4813 return m;
4814 }
4815 }
4816 // None found, return null for the caller to handle.
4817 return nullptr;
4818 }
4819
4820
4821 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) const {
4822 const InstanceKlass* holder = get_klass_version(version);
4823 if (holder == nullptr) {
4824 return nullptr; // The version of klass is gone, no method is found
4825 }
4826 return holder->method_with_orig_idnum(idnum);
4827 }
4828
4829 #if INCLUDE_JVMTI
4830 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() {
4831 return _cached_class_file;
4832 }
4833
4834 jint InstanceKlass::get_cached_class_file_len() {
4835 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
4836 }
4837
4838 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
4839 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
4840 }
4841 #endif
4842
4843 // Make a step iterating over the class hierarchy under the root class.
4844 // Skips subclasses if requested.
4845 void ClassHierarchyIterator::next() {
4846 assert(_current != nullptr, "required");
4847 if (_visit_subclasses && _current->subklass() != nullptr) {
4848 _current = _current->subklass();
4849 return; // visit next subclass
4850 }
4851 _visit_subclasses = true; // reset
4852 while (_current->next_sibling() == nullptr && _current != _root) {
4853 _current = _current->superklass(); // backtrack; no more sibling subclasses left
4854 }
4855 if (_current == _root) {
4856 // Iteration is over (back at root after backtracking). Invalidate the iterator.
4857 _current = nullptr;
4858 return;
4859 }
4860 _current = _current->next_sibling();
4861 return; // visit next sibling subclass
4862 }