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