1 /*
2 * Copyright (c) 1997, 2024, 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 "precompiled.hpp"
26 #include "cds/archiveUtils.hpp"
27 #include "cds/cdsConfig.hpp"
28 #include "cds/cdsEnumKlass.hpp"
29 #include "cds/classListWriter.hpp"
30 #include "cds/heapShared.hpp"
31 #include "cds/metaspaceShared.hpp"
32 #include "classfile/classFileParser.hpp"
33 #include "classfile/classFileStream.hpp"
34 #include "classfile/classLoader.hpp"
35 #include "classfile/classLoaderData.inline.hpp"
36 #include "classfile/javaClasses.hpp"
37 #include "classfile/moduleEntry.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/systemDictionaryShared.hpp"
40 #include "classfile/verifier.hpp"
41 #include "classfile/vmClasses.hpp"
42 #include "classfile/vmSymbols.hpp"
43 #include "code/codeCache.hpp"
44 #include "code/dependencyContext.hpp"
45 #include "compiler/compilationPolicy.hpp"
46 #include "compiler/compileBroker.hpp"
47 #include "gc/shared/collectedHeap.inline.hpp"
48 #include "interpreter/bytecodeHistogram.hpp"
49 #include "interpreter/bytecodeStream.hpp"
50 #include "interpreter/oopMapCache.hpp"
51 #include "interpreter/rewriter.hpp"
52 #include "jvm.h"
53 #include "jvmtifiles/jvmti.h"
54 #include "logging/log.hpp"
55 #include "logging/logMessage.hpp"
56 #include "logging/logStream.hpp"
57 #include "memory/allocation.inline.hpp"
58 #include "memory/iterator.inline.hpp"
59 #include "memory/metadataFactory.hpp"
60 #include "memory/metaspaceClosure.hpp"
61 #include "memory/oopFactory.hpp"
62 #include "memory/resourceArea.hpp"
63 #include "memory/universe.hpp"
64 #include "oops/fieldStreams.inline.hpp"
65 #include "oops/constantPool.hpp"
66 #include "oops/instanceClassLoaderKlass.hpp"
67 #include "oops/instanceKlass.inline.hpp"
68 #include "oops/instanceMirrorKlass.hpp"
69 #include "oops/instanceOop.hpp"
70 #include "oops/instanceStackChunkKlass.hpp"
71 #include "oops/klass.inline.hpp"
72 #include "oops/method.hpp"
73 #include "oops/oop.inline.hpp"
74 #include "oops/recordComponent.hpp"
75 #include "oops/symbol.hpp"
76 #include "oops/trainingData.hpp"
77 #include "prims/jvmtiExport.hpp"
78 #include "prims/jvmtiRedefineClasses.hpp"
79 #include "prims/jvmtiThreadState.hpp"
80 #include "prims/methodComparator.hpp"
81 #include "runtime/arguments.hpp"
82 #include "runtime/deoptimization.hpp"
83 #include "runtime/atomic.hpp"
84 #include "runtime/fieldDescriptor.inline.hpp"
85 #include "runtime/handles.inline.hpp"
86 #include "runtime/javaCalls.hpp"
87 #include "runtime/javaThread.inline.hpp"
88 #include "runtime/mutexLocker.hpp"
89 #include "runtime/orderAccess.hpp"
90 #include "runtime/os.inline.hpp"
91 #include "runtime/reflection.hpp"
92 #include "runtime/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/stringUtils.hpp"
100 #include "utilities/pair.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 bool InstanceKlass::has_as_permitted_subclass(const InstanceKlass* k) const {
215 Thread* current = Thread::current();
216 assert(k != nullptr, "sanity check");
217 assert(_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array(),
218 "unexpected empty _permitted_subclasses array");
219
220 if (log_is_enabled(Trace, class, sealed)) {
221 ResourceMark rm(current);
222 log_trace(class, sealed)("Checking for permitted subclass of %s in %s",
223 k->external_name(), this->external_name());
224 }
225
226 // Check that the class and its super are in the same module.
227 if (k->module() != this->module()) {
228 ResourceMark rm(current);
229 log_trace(class, sealed)("Check failed for same module of permitted subclass %s and sealed class %s",
230 k->external_name(), this->external_name());
231 return false;
232 }
233
234 if (!k->is_public() && !is_same_class_package(k)) {
235 ResourceMark rm(current);
236 log_trace(class, sealed)("Check failed, subclass %s not public and not in the same package as sealed class %s",
237 k->external_name(), this->external_name());
238 return false;
239 }
240
241 for (int i = 0; i < _permitted_subclasses->length(); i++) {
242 int cp_index = _permitted_subclasses->at(i);
243 Symbol* name = _constants->klass_name_at(cp_index);
244 if (name == k->name()) {
245 log_trace(class, sealed)("- Found it at permitted_subclasses[%d] => cp[%d]", i, cp_index);
246 return true;
247 }
248 }
249 log_trace(class, sealed)("- class is NOT a permitted subclass!");
250 return false;
251 }
252
253 // Return nest-host class, resolving, validating and saving it if needed.
254 // In cases where this is called from a thread that cannot do classloading
255 // (such as a native JIT thread) then we simply return null, which in turn
256 // causes the access check to return false. Such code will retry the access
257 // from a more suitable environment later. Otherwise the _nest_host is always
258 // set once this method returns.
259 // Any errors from nest-host resolution must be preserved so they can be queried
260 // from higher-level access checking code, and reported as part of access checking
261 // exceptions.
262 // VirtualMachineErrors are propagated with a null return.
263 // Under any conditions where the _nest_host can be set to non-null the resulting
264 // value of it and, if applicable, the nest host resolution/validation error,
265 // are idempotent.
266 InstanceKlass* InstanceKlass::nest_host(TRAPS) {
267 InstanceKlass* nest_host_k = _nest_host;
268 if (nest_host_k != nullptr) {
269 return nest_host_k;
270 }
271
272 ResourceMark rm(THREAD);
273
274 // need to resolve and save our nest-host class.
275 if (_nest_host_index != 0) { // we have a real nest_host
276 // Before trying to resolve check if we're in a suitable context
277 bool can_resolve = THREAD->can_call_java();
278 if (!can_resolve && !_constants->tag_at(_nest_host_index).is_klass()) {
279 log_trace(class, nestmates)("Rejected resolution of nest-host of %s in unsuitable thread",
280 this->external_name());
281 return nullptr; // sentinel to say "try again from a different context"
282 }
283
284 log_trace(class, nestmates)("Resolving nest-host of %s using cp entry for %s",
285 this->external_name(),
286 _constants->klass_name_at(_nest_host_index)->as_C_string());
287
288 Klass* k = _constants->klass_at(_nest_host_index, THREAD);
289 if (HAS_PENDING_EXCEPTION) {
290 if (PENDING_EXCEPTION->is_a(vmClasses::VirtualMachineError_klass())) {
291 return nullptr; // propagate VMEs
292 }
293 stringStream ss;
294 char* target_host_class = _constants->klass_name_at(_nest_host_index)->as_C_string();
295 ss.print("Nest host resolution of %s with host %s failed: ",
296 this->external_name(), target_host_class);
297 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
298 const char* msg = ss.as_string(true /* on C-heap */);
299 constantPoolHandle cph(THREAD, constants());
300 SystemDictionary::add_nest_host_error(cph, _nest_host_index, msg);
301 CLEAR_PENDING_EXCEPTION;
302
303 log_trace(class, nestmates)("%s", msg);
304 } else {
305 // A valid nest-host is an instance class in the current package that lists this
306 // class as a nest member. If any of these conditions are not met the class is
307 // its own nest-host.
308 const char* error = nullptr;
309
310 // JVMS 5.4.4 indicates package check comes first
311 if (is_same_class_package(k)) {
312 // Now check actual membership. We can't be a member if our "host" is
313 // not an instance class.
314 if (k->is_instance_klass()) {
315 nest_host_k = InstanceKlass::cast(k);
316 bool is_member = nest_host_k->has_nest_member(THREAD, this);
317 if (is_member) {
318 _nest_host = nest_host_k; // save resolved nest-host value
319
320 log_trace(class, nestmates)("Resolved nest-host of %s to %s",
321 this->external_name(), k->external_name());
322 return nest_host_k;
323 } else {
324 error = "current type is not listed as a nest member";
325 }
326 } else {
327 error = "host is not an instance class";
328 }
329 } else {
330 error = "types are in different packages";
331 }
332
333 // something went wrong, so record what and log it
334 {
335 stringStream ss;
336 ss.print("Type %s (loader: %s) is not a nest member of type %s (loader: %s): %s",
337 this->external_name(),
338 this->class_loader_data()->loader_name_and_id(),
339 k->external_name(),
340 k->class_loader_data()->loader_name_and_id(),
341 error);
342 const char* msg = ss.as_string(true /* on C-heap */);
343 constantPoolHandle cph(THREAD, constants());
344 SystemDictionary::add_nest_host_error(cph, _nest_host_index, msg);
345 log_trace(class, nestmates)("%s", msg);
346 }
347 }
348 } else {
349 log_trace(class, nestmates)("Type %s is not part of a nest: setting nest-host to self",
350 this->external_name());
351 }
352
353 // Either not in an explicit nest, or else an error occurred, so
354 // the nest-host is set to `this`. Any thread that sees this assignment
355 // will also see any setting of nest_host_error(), if applicable.
356 return (_nest_host = this);
357 }
358
359 // Dynamic nest member support: set this class's nest host to the given class.
360 // This occurs as part of the class definition, as soon as the instanceKlass
361 // has been created and doesn't require further resolution. The code:
362 // lookup().defineHiddenClass(bytes_for_X, NESTMATE);
363 // results in:
364 // class_of_X.set_nest_host(lookup().lookupClass().getNestHost())
365 // If it has an explicit _nest_host_index or _nest_members, these will be ignored.
366 // We also know the "host" is a valid nest-host in the same package so we can
367 // assert some of those facts.
368 void InstanceKlass::set_nest_host(InstanceKlass* host) {
369 assert(is_hidden(), "must be a hidden class");
370 assert(host != nullptr, "null nest host specified");
371 assert(_nest_host == nullptr, "current class has resolved nest-host");
372 assert(nest_host_error() == nullptr, "unexpected nest host resolution error exists: %s",
373 nest_host_error());
374 assert((host->_nest_host == nullptr && host->_nest_host_index == 0) ||
375 (host->_nest_host == host), "proposed host is not a valid nest-host");
376 // Can't assert this as package is not set yet:
377 // assert(is_same_class_package(host), "proposed host is in wrong package");
378
379 if (log_is_enabled(Trace, class, nestmates)) {
380 ResourceMark rm;
381 const char* msg = "";
382 // a hidden class does not expect a statically defined nest-host
383 if (_nest_host_index > 0) {
384 msg = "(the NestHost attribute in the current class is ignored)";
385 } else if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) {
386 msg = "(the NestMembers attribute in the current class is ignored)";
387 }
388 log_trace(class, nestmates)("Injected type %s into the nest of %s %s",
389 this->external_name(),
390 host->external_name(),
391 msg);
392 }
393 // set dynamic nest host
394 _nest_host = host;
395 // Record dependency to keep nest host from being unloaded before this class.
396 ClassLoaderData* this_key = class_loader_data();
397 assert(this_key != nullptr, "sanity");
398 this_key->record_dependency(host);
399 }
400
401 // check if 'this' and k are nestmates (same nest_host), or k is our nest_host,
402 // or we are k's nest_host - all of which is covered by comparing the two
403 // resolved_nest_hosts.
404 // Any exceptions (i.e. VMEs) are propagated.
405 bool InstanceKlass::has_nestmate_access_to(InstanceKlass* k, TRAPS) {
406
407 assert(this != k, "this should be handled by higher-level code");
408
409 // Per JVMS 5.4.4 we first resolve and validate the current class, then
410 // the target class k.
411
412 InstanceKlass* cur_host = nest_host(CHECK_false);
413 if (cur_host == nullptr) {
414 return false;
415 }
416
417 Klass* k_nest_host = k->nest_host(CHECK_false);
418 if (k_nest_host == nullptr) {
419 return false;
420 }
421
422 bool access = (cur_host == k_nest_host);
423
424 ResourceMark rm(THREAD);
425 log_trace(class, nestmates)("Class %s does %shave nestmate access to %s",
426 this->external_name(),
427 access ? "" : "NOT ",
428 k->external_name());
429 return access;
430 }
431
432 const char* InstanceKlass::nest_host_error() {
433 if (_nest_host_index == 0) {
434 return nullptr;
435 } else {
436 constantPoolHandle cph(Thread::current(), constants());
437 return SystemDictionary::find_nest_host_error(cph, (int)_nest_host_index);
438 }
439 }
440
441 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) {
442 const int size = InstanceKlass::size(parser.vtable_size(),
443 parser.itable_size(),
444 nonstatic_oop_map_size(parser.total_oop_map_count()),
445 parser.is_interface());
446
447 const Symbol* const class_name = parser.class_name();
448 assert(class_name != nullptr, "invariant");
449 ClassLoaderData* loader_data = parser.loader_data();
450 assert(loader_data != nullptr, "invariant");
451
452 InstanceKlass* ik;
453
454 // Allocation
455 if (parser.is_instance_ref_klass()) {
456 // java.lang.ref.Reference
457 ik = new (loader_data, size, THREAD) InstanceRefKlass(parser);
458 } else if (class_name == vmSymbols::java_lang_Class()) {
459 // mirror - java.lang.Class
460 ik = new (loader_data, size, THREAD) InstanceMirrorKlass(parser);
461 } else if (is_stack_chunk_class(class_name, loader_data)) {
462 // stack chunk
463 ik = new (loader_data, size, THREAD) InstanceStackChunkKlass(parser);
464 } else if (is_class_loader(class_name, parser)) {
465 // class loader - java.lang.ClassLoader
466 ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser);
467 } else {
468 // normal
469 ik = new (loader_data, size, THREAD) InstanceKlass(parser);
470 }
471
472 // Check for pending exception before adding to the loader data and incrementing
473 // class count. Can get OOM here.
474 if (HAS_PENDING_EXCEPTION) {
475 return nullptr;
476 }
477
478 return ik;
479 }
480
481
482 // copy method ordering from resource area to Metaspace
483 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) {
484 if (m != nullptr) {
485 // allocate a new array and copy contents (memcpy?)
486 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
487 for (int i = 0; i < m->length(); i++) {
488 _method_ordering->at_put(i, m->at(i));
489 }
490 } else {
491 _method_ordering = Universe::the_empty_int_array();
492 }
493 }
494
495 // create a new array of vtable_indices for default methods
496 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
497 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
498 assert(default_vtable_indices() == nullptr, "only create once");
499 set_default_vtable_indices(vtable_indices);
500 return vtable_indices;
501 }
502
503 static Monitor* create_init_monitor(const char* name) {
504 return new Monitor(Mutex::safepoint, name);
505 }
506
507 InstanceKlass::InstanceKlass() {
508 assert(CDSConfig::is_dumping_static_archive() || UseSharedSpaces, "only for CDS");
509 }
510
511 InstanceKlass::InstanceKlass(const ClassFileParser& parser, KlassKind kind, ReferenceType reference_type) :
512 Klass(kind),
513 _nest_members(nullptr),
514 _nest_host(nullptr),
515 _permitted_subclasses(nullptr),
516 _record_components(nullptr),
517 _static_field_size(parser.static_field_size()),
518 _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())),
519 _itable_len(parser.itable_size()),
520 _nest_host_index(0),
521 _init_state(allocated),
522 _reference_type(reference_type),
523 _init_monitor(create_init_monitor("InstanceKlassInitMonitor_lock")),
524 _init_thread(nullptr)
525 {
526 set_vtable_length(parser.vtable_size());
527 set_access_flags(parser.access_flags());
528 if (parser.is_hidden()) set_is_hidden();
529 set_layout_helper(Klass::instance_layout_helper(parser.layout_size(),
530 false));
531
532 assert(nullptr == _methods, "underlying memory not zeroed?");
533 assert(is_instance_klass(), "is layout incorrect?");
534 assert(size_helper() == parser.layout_size(), "incorrect size_helper?");
535 }
536
537 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
538 Array<Method*>* methods) {
539 if (methods != nullptr && methods != Universe::the_empty_method_array() &&
540 !methods->is_shared()) {
541 for (int i = 0; i < methods->length(); i++) {
542 Method* method = methods->at(i);
543 if (method == nullptr) continue; // maybe null if error processing
544 // Only want to delete methods that are not executing for RedefineClasses.
545 // The previous version will point to them so they're not totally dangling
546 assert (!method->on_stack(), "shouldn't be called with methods on stack");
547 MetadataFactory::free_metadata(loader_data, method);
548 }
549 MetadataFactory::free_array<Method*>(loader_data, methods);
550 }
551 }
552
553 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
554 const Klass* super_klass,
555 Array<InstanceKlass*>* local_interfaces,
556 Array<InstanceKlass*>* transitive_interfaces) {
557 // Only deallocate transitive interfaces if not empty, same as super class
558 // or same as local interfaces. See code in parseClassFile.
559 Array<InstanceKlass*>* ti = transitive_interfaces;
560 if (ti != Universe::the_empty_instance_klass_array() && ti != local_interfaces) {
561 // check that the interfaces don't come from super class
562 Array<InstanceKlass*>* sti = (super_klass == nullptr) ? nullptr :
563 InstanceKlass::cast(super_klass)->transitive_interfaces();
564 if (ti != sti && ti != nullptr && !ti->is_shared()) {
565 MetadataFactory::free_array<InstanceKlass*>(loader_data, ti);
566 }
567 }
568
569 // local interfaces can be empty
570 if (local_interfaces != Universe::the_empty_instance_klass_array() &&
571 local_interfaces != nullptr && !local_interfaces->is_shared()) {
572 MetadataFactory::free_array<InstanceKlass*>(loader_data, local_interfaces);
573 }
574 }
575
576 void InstanceKlass::deallocate_record_components(ClassLoaderData* loader_data,
577 Array<RecordComponent*>* record_components) {
578 if (record_components != nullptr && !record_components->is_shared()) {
579 for (int i = 0; i < record_components->length(); i++) {
580 RecordComponent* record_component = record_components->at(i);
581 MetadataFactory::free_metadata(loader_data, record_component);
582 }
583 MetadataFactory::free_array<RecordComponent*>(loader_data, record_components);
584 }
585 }
586
587 // This function deallocates the metadata and C heap pointers that the
588 // InstanceKlass points to.
589 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
590 // Orphan the mirror first, CMS thinks it's still live.
591 if (java_mirror() != nullptr) {
592 java_lang_Class::set_klass(java_mirror(), nullptr);
593 }
594
595 // Also remove mirror from handles
596 loader_data->remove_handle(_java_mirror);
597
598 // Need to take this class off the class loader data list.
599 loader_data->remove_class(this);
600
601 // The array_klass for this class is created later, after error handling.
602 // For class redefinition, we keep the original class so this scratch class
603 // doesn't have an array class. Either way, assert that there is nothing
604 // to deallocate.
605 assert(array_klasses() == nullptr, "array classes shouldn't be created for this class yet");
606
607 // Release C heap allocated data that this points to, which includes
608 // reference counting symbol names.
609 // Can't release the constant pool or MethodData C heap data here because the constant
610 // pool can be deallocated separately from the InstanceKlass for default methods and
611 // redefine classes. MethodData can also be released separately.
612 release_C_heap_structures(/* release_sub_metadata */ false);
613
614 deallocate_methods(loader_data, methods());
615 set_methods(nullptr);
616
617 deallocate_record_components(loader_data, record_components());
618 set_record_components(nullptr);
619
620 if (method_ordering() != nullptr &&
621 method_ordering() != Universe::the_empty_int_array() &&
622 !method_ordering()->is_shared()) {
623 MetadataFactory::free_array<int>(loader_data, method_ordering());
624 }
625 set_method_ordering(nullptr);
626
627 // default methods can be empty
628 if (default_methods() != nullptr &&
629 default_methods() != Universe::the_empty_method_array() &&
630 !default_methods()->is_shared()) {
631 MetadataFactory::free_array<Method*>(loader_data, default_methods());
632 }
633 // Do NOT deallocate the default methods, they are owned by superinterfaces.
634 set_default_methods(nullptr);
635
636 // default methods vtable indices can be empty
637 if (default_vtable_indices() != nullptr &&
638 !default_vtable_indices()->is_shared()) {
639 MetadataFactory::free_array<int>(loader_data, default_vtable_indices());
640 }
641 set_default_vtable_indices(nullptr);
642
643
644 // This array is in Klass, but remove it with the InstanceKlass since
645 // this place would be the only caller and it can share memory with transitive
646 // interfaces.
647 if (secondary_supers() != nullptr &&
648 secondary_supers() != Universe::the_empty_klass_array() &&
649 // see comments in compute_secondary_supers about the following cast
650 (address)(secondary_supers()) != (address)(transitive_interfaces()) &&
651 !secondary_supers()->is_shared()) {
652 MetadataFactory::free_array<Klass*>(loader_data, secondary_supers());
653 }
654 set_secondary_supers(nullptr);
655
656 deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces());
657 set_transitive_interfaces(nullptr);
658 set_local_interfaces(nullptr);
659
660 if (fieldinfo_stream() != nullptr && !fieldinfo_stream()->is_shared()) {
661 MetadataFactory::free_array<u1>(loader_data, fieldinfo_stream());
662 }
663 set_fieldinfo_stream(nullptr);
664
665 if (fields_status() != nullptr && !fields_status()->is_shared()) {
666 MetadataFactory::free_array<FieldStatus>(loader_data, fields_status());
667 }
668 set_fields_status(nullptr);
669
670 // If a method from a redefined class is using this constant pool, don't
671 // delete it, yet. The new class's previous version will point to this.
672 if (constants() != nullptr) {
673 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack");
674 if (!constants()->is_shared()) {
675 MetadataFactory::free_metadata(loader_data, constants());
676 }
677 // Delete any cached resolution errors for the constant pool
678 SystemDictionary::delete_resolution_error(constants());
679
680 set_constants(nullptr);
681 }
682
683 if (inner_classes() != nullptr &&
684 inner_classes() != Universe::the_empty_short_array() &&
685 !inner_classes()->is_shared()) {
686 MetadataFactory::free_array<jushort>(loader_data, inner_classes());
687 }
688 set_inner_classes(nullptr);
689
690 if (nest_members() != nullptr &&
691 nest_members() != Universe::the_empty_short_array() &&
692 !nest_members()->is_shared()) {
693 MetadataFactory::free_array<jushort>(loader_data, nest_members());
694 }
695 set_nest_members(nullptr);
696
697 if (permitted_subclasses() != nullptr &&
698 permitted_subclasses() != Universe::the_empty_short_array() &&
699 !permitted_subclasses()->is_shared()) {
700 MetadataFactory::free_array<jushort>(loader_data, permitted_subclasses());
701 }
702 set_permitted_subclasses(nullptr);
703
704 // We should deallocate the Annotations instance if it's not in shared spaces.
705 if (annotations() != nullptr && !annotations()->is_shared()) {
706 MetadataFactory::free_metadata(loader_data, annotations());
707 }
708 set_annotations(nullptr);
709
710 SystemDictionaryShared::handle_class_unloading(this);
711
712 #if INCLUDE_CDS_JAVA_HEAP
713 if (CDSConfig::is_dumping_heap()) {
714 HeapShared::remove_scratch_objects(this);
715 }
716 #endif
717 }
718
719 bool InstanceKlass::is_record() const {
720 return _record_components != nullptr &&
721 is_final() &&
722 java_super() == vmClasses::Record_klass();
723 }
724
725 bool InstanceKlass::is_sealed() const {
726 return _permitted_subclasses != nullptr &&
727 _permitted_subclasses != Universe::the_empty_short_array();
728 }
729
730 bool InstanceKlass::should_be_initialized() const {
731 return !is_initialized();
732 }
733
734 klassItable InstanceKlass::itable() const {
735 return klassItable(const_cast<InstanceKlass*>(this));
736 }
737
738 // JVMTI spec thinks there are signers and protection domain in the
739 // instanceKlass. These accessors pretend these fields are there.
740 // The hprof specification also thinks these fields are in InstanceKlass.
741 oop InstanceKlass::protection_domain() const {
742 // return the protection_domain from the mirror
743 return java_lang_Class::protection_domain(java_mirror());
744 }
745
746 objArrayOop InstanceKlass::signers() const {
747 // return the signers from the mirror
748 return java_lang_Class::signers(java_mirror());
749 }
750
751 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization
752 // process. The step comments refers to the procedure described in that section.
753 // Note: implementation moved to static method to expose the this pointer.
754 void InstanceKlass::initialize(TRAPS) {
755 if (this->should_be_initialized()) {
756 initialize_impl(CHECK);
757 // Note: at this point the class may be initialized
758 // OR it may be in the state of being initialized
759 // in case of recursive initialization!
760 } else {
761 assert(is_initialized(), "sanity check");
762 }
763 }
764
765 static bool are_super_types_initialized(InstanceKlass* ik) {
766 InstanceKlass* s = ik->java_super();
767 if (s != nullptr && !s->is_initialized()) {
768 return false;
769 }
770
771 if (ik->has_nonstatic_concrete_methods()) {
772 // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and
773 // having a superinterface that declares, non-static, concrete methods
774 Array<InstanceKlass*>* interfaces = ik->local_interfaces();
775 int len = interfaces->length();
776 for (int i = 0; i < len; i++) {
777 InstanceKlass* intf = interfaces->at(i);
778 if (!intf->is_initialized()) {
779 return false;
780 }
781 }
782 }
783
784 return true;
785 }
786
787 static void log_class_init_start(outputStream* st, JavaThread* current, InstanceKlass* ik, int init_id) {
788 ResourceMark rm;
789 const char* info = "";
790 if (ik->has_preinitialized_mirror() && CDSConfig::is_loading_heap()) {
791 info = " (preinitialized)";
792 } else if (ik->class_initializer() == nullptr) {
793 info = " (no method)";
794 }
795 st->print("%d Initializing ", init_id);
796 ik->name()->print_value_on(st);
797 st->print_cr("%s (" PTR_FORMAT ") by thread " PTR_FORMAT " \"%s\"", info, p2i(ik), p2i(current), current->name());
798 }
799
800 static int log_class_init(JavaThread* current, InstanceKlass* ik) {
801 int init_id = -1;
802 LogStreamHandle(Info, init, class) lsh1;
803 LogStreamHandle(Debug, init) lsh2;
804 if (lsh1.is_enabled() || lsh2.is_enabled()) {
805 static int call_class_initializer_counter = 0; // for debugging
806 init_id = Atomic::fetch_then_add(&call_class_initializer_counter, 1);
807 if (lsh1.is_enabled()) {
808 log_class_init_start(&lsh1, current, ik, init_id);
809 }
810 if (lsh2.is_enabled() && ik->class_initializer() != nullptr && !ik->has_preinitialized_mirror()) {
811 log_class_init_start(&lsh2, current, ik, init_id);
812 }
813 }
814 return init_id;
815 }
816
817 void InstanceKlass::initialize_from_cds(TRAPS) {
818 if (is_initialized()) {
819 return;
820 }
821
822 if (has_preinitialized_mirror() && CDSConfig::is_loading_heap() &&
823 !ForceProfiling &&
824 !RecordTraining &&
825 are_super_types_initialized(this)) {
826 // FIXME: also check for events listeners such as JVMTI, JFR, etc
827 if (log_is_enabled(Info, cds, init)) {
828 ResourceMark rm;
829 log_info(cds, init)("%s (quickest)", external_name());
830 }
831
832 link_class(CHECK);
833
834 #ifdef AZZERT
835 {
836 MonitorLocker ml(THREAD, _init_monitor);
837 assert(!initialized(), "sanity");
838 assert(!is_being_initialized(), "sanity");
839 assert(!is_in_error_state(), "sanity");
840 }
841 #endif
842
843 log_class_init(THREAD, this);
844 set_init_thread(THREAD);
845 set_initialization_state_and_notify(fully_initialized, CHECK);
846 return;
847 }
848
849 if (log_is_enabled(Info, cds, init)) {
850 ResourceMark rm;
851 log_info(cds, init)("%s%s", external_name(),
852 (has_preinitialized_mirror() && CDSConfig::is_loading_heap()) ? " (quicker)" : "");
853 }
854 initialize(THREAD);
855 }
856
857 bool InstanceKlass::verify_code(TRAPS) {
858 // 1) Verify the bytecodes
859 return Verifier::verify(this, should_verify_class(), THREAD);
860 }
861
862 void InstanceKlass::link_class(TRAPS) {
863 assert(is_loaded(), "must be loaded");
864 if (!is_linked()) {
865 link_class_impl(CHECK);
866 }
867 }
868
869 void InstanceKlass::check_link_state_and_wait(JavaThread* current) {
870 MonitorLocker ml(current, _init_monitor);
871
872 bool debug_logging_enabled = log_is_enabled(Debug, class, init);
873
874 // Another thread is linking this class, wait.
875 while (is_being_linked() && !is_init_thread(current)) {
876 if (debug_logging_enabled) {
877 ResourceMark rm(current);
878 log_debug(class, init)("Thread \"%s\" waiting for linking of %s by thread \"%s\"",
879 current->name(), external_name(), init_thread_name());
880 }
881 ml.wait();
882 }
883
884 // This thread is recursively linking this class, continue
885 if (is_being_linked() && is_init_thread(current)) {
886 if (debug_logging_enabled) {
887 ResourceMark rm(current);
888 log_debug(class, init)("Thread \"%s\" recursively linking %s",
889 current->name(), external_name());
890 }
891 return;
892 }
893
894 // If this class wasn't linked already, set state to being_linked
895 if (!is_linked()) {
896 if (debug_logging_enabled) {
897 ResourceMark rm(current);
898 log_debug(class, init)("Thread \"%s\" linking %s",
899 current->name(), external_name());
900 }
901 set_init_state(being_linked);
902 set_init_thread(current);
903 } else {
904 if (debug_logging_enabled) {
905 ResourceMark rm(current);
906 log_debug(class, init)("Thread \"%s\" found %s already linked",
907 current->name(), external_name());
908 }
909 }
910 }
911
912 // Called to verify that a class can link during initialization, without
913 // throwing a VerifyError.
914 bool InstanceKlass::link_class_or_fail(TRAPS) {
915 assert(is_loaded(), "must be loaded");
916 if (!is_linked()) {
917 link_class_impl(CHECK_false);
918 }
919 return is_linked();
920 }
921
922 bool InstanceKlass::link_class_impl(TRAPS) {
923 if (CDSConfig::is_dumping_static_archive() && SystemDictionaryShared::has_class_failed_verification(this)) {
924 // This is for CDS static dump only -- we use the in_error_state to indicate that
925 // the class has failed verification. Throwing the NoClassDefFoundError here is just
926 // a convenient way to stop repeat attempts to verify the same (bad) class.
927 //
928 // Note that the NoClassDefFoundError is not part of the JLS, and should not be thrown
929 // if we are executing Java code. This is not a problem for CDS dumping phase since
930 // it doesn't execute any Java code.
931 ResourceMark rm(THREAD);
932 Exceptions::fthrow(THREAD_AND_LOCATION,
933 vmSymbols::java_lang_NoClassDefFoundError(),
934 "Class %s, or one of its supertypes, failed class initialization",
935 external_name());
936 return false;
937 }
938 // return if already verified
939 if (is_linked()) {
940 return true;
941 }
942
943 // Timing
944 // timer handles recursion
945 JavaThread* jt = THREAD;
946
947 // link super class before linking this class
948 Klass* super_klass = super();
949 if (super_klass != nullptr) {
950 if (super_klass->is_interface()) { // check if super class is an interface
951 ResourceMark rm(THREAD);
952 Exceptions::fthrow(
953 THREAD_AND_LOCATION,
954 vmSymbols::java_lang_IncompatibleClassChangeError(),
955 "class %s has interface %s as super class",
956 external_name(),
957 super_klass->external_name()
958 );
959 return false;
960 }
961
962 InstanceKlass* ik_super = InstanceKlass::cast(super_klass);
963 ik_super->link_class_impl(CHECK_false);
964 }
965
966 // link all interfaces implemented by this class before linking this class
967 Array<InstanceKlass*>* interfaces = local_interfaces();
968 int num_interfaces = interfaces->length();
969 for (int index = 0; index < num_interfaces; index++) {
970 InstanceKlass* interk = interfaces->at(index);
971 interk->link_class_impl(CHECK_false);
972 }
973
974 // in case the class is linked in the process of linking its superclasses
975 if (is_linked()) {
976 return true;
977 }
978
979 // trace only the link time for this klass that includes
980 // the verification time
981 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
982 ClassLoader::perf_class_link_selftime(),
983 ClassLoader::perf_classes_linked(),
984 jt->get_thread_stat()->perf_recursion_counts_addr(),
985 jt->get_thread_stat()->perf_timers_addr(),
986 PerfClassTraceTime::CLASS_LINK);
987
988 // verification & rewriting
989 {
990 LockLinkState init_lock(this, jt);
991
992 // rewritten will have been set if loader constraint error found
993 // on an earlier link attempt
994 // don't verify or rewrite if already rewritten
995 //
996
997 if (!is_linked()) {
998 if (!is_rewritten()) {
999 if (is_shared()) {
1000 assert(!verified_at_dump_time(), "must be");
1001 }
1002 {
1003 bool verify_ok = verify_code(THREAD);
1004 if (!verify_ok) {
1005 return false;
1006 }
1007 }
1008
1009 // Just in case a side-effect of verify linked this class already
1010 // (which can sometimes happen since the verifier loads classes
1011 // using custom class loaders, which are free to initialize things)
1012 if (is_linked()) {
1013 return true;
1014 }
1015
1016 // also sets rewritten
1017 rewrite_class(CHECK_false);
1018 } else if (is_shared()) {
1019 SystemDictionaryShared::check_verification_constraints(this, CHECK_false);
1020 }
1021
1022 // relocate jsrs and link methods after they are all rewritten
1023 link_methods(CHECK_false);
1024
1025 // Initialize the vtable and interface table after
1026 // methods have been rewritten since rewrite may
1027 // fabricate new Method*s.
1028 // also does loader constraint checking
1029 //
1030 // initialize_vtable and initialize_itable need to be rerun
1031 // for a shared class if
1032 // 1) the class is loaded by custom class loader or
1033 // 2) the class is loaded by built-in class loader but failed to add archived loader constraints or
1034 // 3) the class was not verified during dump time
1035 bool need_init_table = true;
1036 if (is_shared() && verified_at_dump_time() &&
1037 SystemDictionaryShared::check_linking_constraints(THREAD, this)) {
1038 need_init_table = false;
1039 }
1040 if (need_init_table) {
1041 vtable().initialize_vtable_and_check_constraints(CHECK_false);
1042 itable().initialize_itable_and_check_constraints(CHECK_false);
1043 }
1044 #ifdef ASSERT
1045 vtable().verify(tty, true);
1046 // In case itable verification is ever added.
1047 // itable().verify(tty, true);
1048 #endif
1049 set_initialization_state_and_notify(linked, THREAD);
1050 if (JvmtiExport::should_post_class_prepare()) {
1051 JvmtiExport::post_class_prepare(THREAD, this);
1052 }
1053 }
1054 }
1055 return true;
1056 }
1057
1058 // Rewrite the byte codes of all of the methods of a class.
1059 // The rewriter must be called exactly once. Rewriting must happen after
1060 // verification but before the first method of the class is executed.
1061 void InstanceKlass::rewrite_class(TRAPS) {
1062 assert(is_loaded(), "must be loaded");
1063 if (is_rewritten()) {
1064 assert(is_shared(), "rewriting an unshared class?");
1065 return;
1066 }
1067 Rewriter::rewrite(this, CHECK);
1068 set_rewritten();
1069 }
1070
1071 // Now relocate and link method entry points after class is rewritten.
1072 // This is outside is_rewritten flag. In case of an exception, it can be
1073 // executed more than once.
1074 void InstanceKlass::link_methods(TRAPS) {
1075 PerfTraceElapsedTime timer(ClassLoader::perf_ik_link_methods_time());
1076
1077 int len = methods()->length();
1078 for (int i = len-1; i >= 0; i--) {
1079 methodHandle m(THREAD, methods()->at(i));
1080
1081 // Set up method entry points for compiler and interpreter .
1082 m->link_method(m, CHECK);
1083 }
1084 }
1085
1086 // Eagerly initialize superinterfaces that declare default methods (concrete instance: any access)
1087 void InstanceKlass::initialize_super_interfaces(TRAPS) {
1088 assert (has_nonstatic_concrete_methods(), "caller should have checked this");
1089 for (int i = 0; i < local_interfaces()->length(); ++i) {
1090 InstanceKlass* ik = local_interfaces()->at(i);
1091
1092 // Initialization is depth first search ie. we start with top of the inheritance tree
1093 // has_nonstatic_concrete_methods drives searching superinterfaces since it
1094 // means has_nonstatic_concrete_methods in its superinterface hierarchy
1095 if (ik->has_nonstatic_concrete_methods()) {
1096 ik->initialize_super_interfaces(CHECK);
1097 }
1098
1099 // Only initialize() interfaces that "declare" concrete methods.
1100 if (ik->should_be_initialized() && ik->declares_nonstatic_concrete_methods()) {
1101 ik->initialize(CHECK);
1102 }
1103 }
1104 }
1105
1106 using InitializationErrorTable = ResourceHashtable<const InstanceKlass*, OopHandle, 107, AnyObj::C_HEAP, mtClass>;
1107 static InitializationErrorTable* _initialization_error_table;
1108
1109 void InstanceKlass::add_initialization_error(JavaThread* current, Handle exception) {
1110 // Create the same exception with a message indicating the thread name,
1111 // and the StackTraceElements.
1112 Handle init_error = java_lang_Throwable::create_initialization_error(current, exception);
1113 ResourceMark rm(current);
1114 if (init_error.is_null()) {
1115 log_trace(class, init)("Unable to create the desired initialization error for class %s", external_name());
1116
1117 // We failed to create the new exception, most likely due to either out-of-memory or
1118 // a stackoverflow error. If the original exception was either of those then we save
1119 // the shared, pre-allocated, stackless, instance of that exception.
1120 if (exception->klass() == vmClasses::StackOverflowError_klass()) {
1121 log_debug(class, init)("Using shared StackOverflowError as initialization error for class %s", external_name());
1122 init_error = Handle(current, Universe::class_init_stack_overflow_error());
1123 } else if (exception->klass() == vmClasses::OutOfMemoryError_klass()) {
1124 log_debug(class, init)("Using shared OutOfMemoryError as initialization error for class %s", external_name());
1125 init_error = Handle(current, Universe::class_init_out_of_memory_error());
1126 } else {
1127 return;
1128 }
1129 }
1130
1131 MutexLocker ml(current, ClassInitError_lock);
1132 OopHandle elem = OopHandle(Universe::vm_global(), init_error());
1133 bool created;
1134 if (_initialization_error_table == nullptr) {
1135 _initialization_error_table = new (mtClass) InitializationErrorTable();
1136 }
1137 _initialization_error_table->put_if_absent(this, elem, &created);
1138 assert(created, "Initialization is single threaded");
1139 log_trace(class, init)("Initialization error added for class %s", external_name());
1140 }
1141
1142 oop InstanceKlass::get_initialization_error(JavaThread* current) {
1143 MutexLocker ml(current, ClassInitError_lock);
1144 if (_initialization_error_table == nullptr) {
1145 return nullptr;
1146 }
1147 OopHandle* h = _initialization_error_table->get(this);
1148 return (h != nullptr) ? h->resolve() : nullptr;
1149 }
1150
1151 // Need to remove entries for unloaded classes.
1152 void InstanceKlass::clean_initialization_error_table() {
1153 struct InitErrorTableCleaner {
1154 bool do_entry(const InstanceKlass* ik, OopHandle h) {
1155 if (!ik->is_loader_alive()) {
1156 h.release(Universe::vm_global());
1157 return true;
1158 } else {
1159 return false;
1160 }
1161 }
1162 };
1163
1164 assert_locked_or_safepoint(ClassInitError_lock);
1165 InitErrorTableCleaner cleaner;
1166 if (_initialization_error_table != nullptr) {
1167 _initialization_error_table->unlink(&cleaner);
1168 }
1169 }
1170
1171 void InstanceKlass::initialize_impl(TRAPS) {
1172 HandleMark hm(THREAD);
1173
1174 // Make sure klass is linked (verified) before initialization
1175 // A class could already be verified, since it has been reflected upon.
1176 link_class(CHECK);
1177
1178 DTRACE_CLASSINIT_PROBE(required, -1);
1179
1180 bool wait = false;
1181 bool throw_error = false;
1182
1183 JavaThread* jt = THREAD;
1184
1185 if (ForceProfiling) {
1186 // Preallocate MDOs.
1187 for (int i = 0; i < methods()->length(); i++) {
1188 assert(!HAS_PENDING_EXCEPTION, "");
1189 methodHandle m(THREAD, methods()->at(i));
1190 Method::build_profiling_method_data(m, THREAD);
1191 if (HAS_PENDING_EXCEPTION) {
1192 ResourceMark rm;
1193 log_warning(cds)("MDO preallocation failed for %s", external_name());
1194 CLEAR_PENDING_EXCEPTION;
1195 break;
1196 }
1197 }
1198 }
1199
1200 bool debug_logging_enabled = log_is_enabled(Debug, class, init);
1201
1202 // refer to the JVM book page 47 for description of steps
1203 // Step 1
1204 {
1205 MonitorLocker ml(jt, _init_monitor);
1206
1207 // Step 2
1208 while (is_being_initialized() && !is_init_thread(jt)) {
1209 if (debug_logging_enabled) {
1210 ResourceMark rm(jt);
1211 log_debug(class, init)("Thread \"%s\" waiting for initialization of %s by thread \"%s\"",
1212 jt->name(), external_name(), init_thread_name());
1213 }
1214
1215 wait = true;
1216 jt->set_class_to_be_initialized(this);
1217 ml.wait();
1218 jt->set_class_to_be_initialized(nullptr);
1219 }
1220
1221 // Step 3
1222 if (is_being_initialized() && is_init_thread(jt)) {
1223 if (debug_logging_enabled) {
1224 ResourceMark rm(jt);
1225 log_debug(class, init)("Thread \"%s\" recursively initializing %s",
1226 jt->name(), external_name());
1227 }
1228 DTRACE_CLASSINIT_PROBE_WAIT(recursive, -1, wait);
1229 return;
1230 }
1231
1232 // Step 4
1233 if (is_initialized()) {
1234 if (debug_logging_enabled) {
1235 ResourceMark rm(jt);
1236 log_debug(class, init)("Thread \"%s\" found %s already initialized",
1237 jt->name(), external_name());
1238 }
1239 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, -1, wait);
1240 return;
1241 }
1242
1243 // Step 5
1244 if (is_in_error_state()) {
1245 if (debug_logging_enabled) {
1246 ResourceMark rm(jt);
1247 log_debug(class, init)("Thread \"%s\" found %s is in error state",
1248 jt->name(), external_name());
1249 }
1250 throw_error = true;
1251 } else {
1252
1253 // Step 6
1254 set_init_state(being_initialized);
1255 set_init_thread(jt);
1256 if (debug_logging_enabled) {
1257 ResourceMark rm(jt);
1258 log_debug(class, init)("Thread \"%s\" is initializing %s",
1259 jt->name(), external_name());
1260 }
1261 }
1262 }
1263
1264 // Throw error outside lock
1265 if (throw_error) {
1266 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait);
1267 ResourceMark rm(THREAD);
1268 Handle cause(THREAD, get_initialization_error(THREAD));
1269
1270 stringStream ss;
1271 ss.print("Could not initialize class %s", external_name());
1272 if (cause.is_null()) {
1273 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), ss.as_string());
1274 } else {
1275 THROW_MSG_CAUSE(vmSymbols::java_lang_NoClassDefFoundError(),
1276 ss.as_string(), cause);
1277 }
1278 }
1279
1280 // Step 7
1281 // Next, if C is a class rather than an interface, initialize it's super class and super
1282 // interfaces.
1283 if (!is_interface()) {
1284 Klass* super_klass = super();
1285 if (super_klass != nullptr && super_klass->should_be_initialized()) {
1286 super_klass->initialize(THREAD);
1287 }
1288 // If C implements any interface that declares a non-static, concrete method,
1289 // the initialization of C triggers initialization of its super interfaces.
1290 // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and
1291 // having a superinterface that declares, non-static, concrete methods
1292 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) {
1293 initialize_super_interfaces(THREAD);
1294 }
1295
1296 // If any exceptions, complete abruptly, throwing the same exception as above.
1297 if (HAS_PENDING_EXCEPTION) {
1298 Handle e(THREAD, PENDING_EXCEPTION);
1299 CLEAR_PENDING_EXCEPTION;
1300 {
1301 EXCEPTION_MARK;
1302 add_initialization_error(THREAD, e);
1303 // Locks object, set state, and notify all waiting threads
1304 set_initialization_state_and_notify(initialization_error, THREAD);
1305 CLEAR_PENDING_EXCEPTION;
1306 }
1307 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait);
1308 THROW_OOP(e());
1309 }
1310 }
1311
1312
1313 // Step 8
1314 {
1315 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
1316 if (class_initializer() != nullptr) {
1317 // Timer includes any side effects of class initialization (resolution,
1318 // etc), but not recursive entry into call_class_initializer().
1319 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
1320 ClassLoader::perf_class_init_selftime(),
1321 ClassLoader::perf_classes_inited(),
1322 jt->get_thread_stat()->perf_recursion_counts_addr(),
1323 jt->get_thread_stat()->perf_timers_addr(),
1324 PerfClassTraceTime::CLASS_CLINIT);
1325 call_class_initializer(THREAD);
1326 } else {
1327 // The elapsed time is so small it's not worth counting.
1328 if (UsePerfData) {
1329 ClassLoader::perf_classes_inited()->inc();
1330 }
1331 call_class_initializer(THREAD);
1332 }
1333 }
1334
1335 // Step 9
1336 if (!HAS_PENDING_EXCEPTION) {
1337 set_initialization_state_and_notify(fully_initialized, THREAD);
1338 debug_only(vtable().verify(tty, true);)
1339 CompilationPolicy::replay_training_at_init(this, THREAD);
1340 }
1341 else {
1342 // Step 10 and 11
1343 Handle e(THREAD, PENDING_EXCEPTION);
1344 CLEAR_PENDING_EXCEPTION;
1345 // JVMTI has already reported the pending exception
1346 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1347 JvmtiExport::clear_detected_exception(jt);
1348 {
1349 EXCEPTION_MARK;
1350 add_initialization_error(THREAD, e);
1351 set_initialization_state_and_notify(initialization_error, THREAD);
1352 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below
1353 // JVMTI has already reported the pending exception
1354 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1355 JvmtiExport::clear_detected_exception(jt);
1356 }
1357 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
1358 if (e->is_a(vmClasses::Error_klass())) {
1359 THROW_OOP(e());
1360 } else {
1361 JavaCallArguments args(e);
1362 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
1363 vmSymbols::throwable_void_signature(),
1364 &args);
1365 }
1366 }
1367 DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait);
1368 }
1369
1370 void InstanceKlass::set_initialization_state_and_notify(ClassState state, JavaThread* current) {
1371 MonitorLocker ml(current, _init_monitor);
1372
1373 if (state == linked && UseVtableBasedCHA && Universe::is_fully_initialized()) {
1374 DeoptimizationScope deopt_scope;
1375 {
1376 // Now mark all code that assumes the class is not linked.
1377 // Set state under the Compile_lock also.
1378 MutexLocker ml(current, Compile_lock);
1379
1380 set_init_thread(nullptr); // reset _init_thread before changing _init_state
1381 set_init_state(state);
1382
1383 CodeCache::mark_dependents_on(&deopt_scope, this);
1384 }
1385 // Perform the deopt handshake outside Compile_lock.
1386 deopt_scope.deoptimize_marked();
1387 } else {
1388 set_init_thread(nullptr); // reset _init_thread before changing _init_state
1389 set_init_state(state);
1390 }
1391 ml.notify_all();
1392 }
1393
1394 // Update hierarchy. This is done before the new klass has been added to the SystemDictionary. The Compile_lock
1395 // is grabbed, to ensure that the compiler is not using the class hierarchy.
1396 void InstanceKlass::add_to_hierarchy(JavaThread* current) {
1397 assert(!SafepointSynchronize::is_at_safepoint(), "must NOT be at safepoint");
1398
1399 // In case we are not using CHA based vtables we need to make sure the loaded
1400 // deopt is completed before anyone links this class.
1401 // Linking is done with _init_monitor held, by loading and deopting with it
1402 // held we make sure the deopt is completed before linking.
1403 if (!UseVtableBasedCHA) {
1404 init_monitor()->lock();
1405 }
1406
1407 DeoptimizationScope deopt_scope;
1408 {
1409 MutexLocker ml(current, Compile_lock);
1410
1411 set_init_state(InstanceKlass::loaded);
1412 // make sure init_state store is already done.
1413 // The compiler reads the hierarchy outside of the Compile_lock.
1414 // Access ordering is used to add to hierarchy.
1415
1416 // Link into hierarchy.
1417 append_to_sibling_list(); // add to superklass/sibling list
1418 process_interfaces(); // handle all "implements" declarations
1419
1420 // Now mark all code that depended on old class hierarchy.
1421 // Note: must be done *after* linking k into the hierarchy (was bug 12/9/97)
1422 if (Universe::is_fully_initialized()) {
1423 CodeCache::mark_dependents_on(&deopt_scope, this);
1424 }
1425 }
1426 // Perform the deopt handshake outside Compile_lock.
1427 deopt_scope.deoptimize_marked();
1428
1429 if (!UseVtableBasedCHA) {
1430 init_monitor()->unlock();
1431 }
1432 }
1433
1434 InstanceKlass* InstanceKlass::implementor() const {
1435 InstanceKlass* volatile* ik = adr_implementor();
1436 if (ik == nullptr) {
1437 return nullptr;
1438 } else {
1439 // This load races with inserts, and therefore needs acquire.
1440 InstanceKlass* ikls = Atomic::load_acquire(ik);
1441 if (ikls != nullptr && !ikls->is_loader_alive()) {
1442 return nullptr; // don't return unloaded class
1443 } else {
1444 return ikls;
1445 }
1446 }
1447 }
1448
1449
1450 void InstanceKlass::set_implementor(InstanceKlass* ik) {
1451 assert_locked_or_safepoint(Compile_lock);
1452 assert(is_interface(), "not interface");
1453 InstanceKlass* volatile* addr = adr_implementor();
1454 assert(addr != nullptr, "null addr");
1455 if (addr != nullptr) {
1456 Atomic::release_store(addr, ik);
1457 }
1458 }
1459
1460 int InstanceKlass::nof_implementors() const {
1461 InstanceKlass* ik = implementor();
1462 if (ik == nullptr) {
1463 return 0;
1464 } else if (ik != this) {
1465 return 1;
1466 } else {
1467 return 2;
1468 }
1469 }
1470
1471 // The embedded _implementor field can only record one implementor.
1472 // When there are more than one implementors, the _implementor field
1473 // is set to the interface Klass* itself. Following are the possible
1474 // values for the _implementor field:
1475 // null - no implementor
1476 // implementor Klass* - one implementor
1477 // self - more than one implementor
1478 //
1479 // The _implementor field only exists for interfaces.
1480 void InstanceKlass::add_implementor(InstanceKlass* ik) {
1481 if (Universe::is_fully_initialized()) {
1482 assert_lock_strong(Compile_lock);
1483 }
1484 assert(is_interface(), "not interface");
1485 // Filter out my subinterfaces.
1486 // (Note: Interfaces are never on the subklass list.)
1487 if (ik->is_interface()) return;
1488
1489 // Filter out subclasses whose supers already implement me.
1490 // (Note: CHA must walk subclasses of direct implementors
1491 // in order to locate indirect implementors.)
1492 InstanceKlass* super_ik = ik->java_super();
1493 if (super_ik != nullptr && super_ik->implements_interface(this))
1494 // We only need to check one immediate superclass, since the
1495 // implements_interface query looks at transitive_interfaces.
1496 // Any supers of the super have the same (or fewer) transitive_interfaces.
1497 return;
1498
1499 InstanceKlass* iklass = implementor();
1500 if (iklass == nullptr) {
1501 set_implementor(ik);
1502 } else if (iklass != this && iklass != ik) {
1503 // There is already an implementor. Use itself as an indicator of
1504 // more than one implementors.
1505 set_implementor(this);
1506 }
1507
1508 // The implementor also implements the transitive_interfaces
1509 for (int index = 0; index < local_interfaces()->length(); index++) {
1510 local_interfaces()->at(index)->add_implementor(ik);
1511 }
1512 }
1513
1514 void InstanceKlass::init_implementor() {
1515 if (is_interface()) {
1516 set_implementor(nullptr);
1517 }
1518 }
1519
1520
1521 void InstanceKlass::process_interfaces() {
1522 // link this class into the implementors list of every interface it implements
1523 for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
1524 assert(local_interfaces()->at(i)->is_klass(), "must be a klass");
1525 InstanceKlass* interf = local_interfaces()->at(i);
1526 assert(interf->is_interface(), "expected interface");
1527 interf->add_implementor(this);
1528 }
1529 }
1530
1531 bool InstanceKlass::can_be_primary_super_slow() const {
1532 if (is_interface())
1533 return false;
1534 else
1535 return Klass::can_be_primary_super_slow();
1536 }
1537
1538 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots,
1539 Array<InstanceKlass*>* transitive_interfaces) {
1540 // The secondaries are the implemented interfaces.
1541 // We need the cast because Array<Klass*> is NOT a supertype of Array<InstanceKlass*>,
1542 // (but it's safe to do here because we won't write into _secondary_supers from this point on).
1543 Array<Klass*>* interfaces = (Array<Klass*>*)(address)transitive_interfaces;
1544 int num_secondaries = num_extra_slots + interfaces->length();
1545 if (num_secondaries == 0) {
1546 // Must share this for correct bootstrapping!
1547 set_secondary_supers(Universe::the_empty_klass_array(), Universe::the_empty_klass_bitmap());
1548 return nullptr;
1549 } else if (num_extra_slots == 0) {
1550 // The secondary super list is exactly the same as the transitive interfaces, so
1551 // let's use it instead of making a copy.
1552 // Redefine classes has to be careful not to delete this!
1553 if (!UseSecondarySupersTable) {
1554 set_secondary_supers(interfaces);
1555 return nullptr;
1556 } else if (num_extra_slots == 0 && interfaces->length() <= 1) {
1557 // We will reuse the transitive interfaces list if we're certain
1558 // it's in hash order.
1559 uintx bitmap = compute_secondary_supers_bitmap(interfaces);
1560 set_secondary_supers(interfaces, bitmap);
1561 return nullptr;
1562 }
1563 // ... fall through if that didn't work.
1564 }
1565 // Copy transitive interfaces to a temporary growable array to be constructed
1566 // into the secondary super list with extra slots.
1567 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length());
1568 for (int i = 0; i < interfaces->length(); i++) {
1569 secondaries->push(interfaces->at(i));
1570 }
1571 return secondaries;
1572 }
1573
1574 bool InstanceKlass::implements_interface(Klass* k) const {
1575 if (this == k) return true;
1576 assert(k->is_interface(), "should be an interface class");
1577 for (int i = 0; i < transitive_interfaces()->length(); i++) {
1578 if (transitive_interfaces()->at(i) == k) {
1579 return true;
1580 }
1581 }
1582 return false;
1583 }
1584
1585 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const {
1586 // Verify direct super interface
1587 if (this == k) return true;
1588 assert(k->is_interface(), "should be an interface class");
1589 for (int i = 0; i < local_interfaces()->length(); i++) {
1590 if (local_interfaces()->at(i) == k) {
1591 return true;
1592 }
1593 }
1594 return false;
1595 }
1596
1597 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) {
1598 check_array_allocation_length(length, arrayOopDesc::max_array_length(T_OBJECT), CHECK_NULL);
1599 size_t size = objArrayOopDesc::object_size(length);
1600 ArrayKlass* ak = array_klass(n, CHECK_NULL);
1601 objArrayOop o = (objArrayOop)Universe::heap()->array_allocate(ak, size, length,
1602 /* do_zero */ true, CHECK_NULL);
1603 return o;
1604 }
1605
1606 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
1607 if (TraceFinalizerRegistration) {
1608 tty->print("Registered ");
1609 i->print_value_on(tty);
1610 tty->print_cr(" (" PTR_FORMAT ") as finalizable", p2i(i));
1611 }
1612 instanceHandle h_i(THREAD, i);
1613 // Pass the handle as argument, JavaCalls::call expects oop as jobjects
1614 JavaValue result(T_VOID);
1615 JavaCallArguments args(h_i);
1616 methodHandle mh(THREAD, Universe::finalizer_register_method());
1617 JavaCalls::call(&result, mh, &args, CHECK_NULL);
1618 MANAGEMENT_ONLY(FinalizerService::on_register(h_i(), THREAD);)
1619 return h_i();
1620 }
1621
1622 instanceOop InstanceKlass::allocate_instance(TRAPS) {
1623 assert(!is_abstract() && !is_interface(), "Should not create this object");
1624 size_t size = size_helper(); // Query before forming handle.
1625 return (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL);
1626 }
1627
1628 instanceOop InstanceKlass::allocate_instance(oop java_class,
1629 const char* who,
1630 TRAPS) {
1631 Klass* k = java_lang_Class::as_Klass(java_class);
1632 if (k == nullptr) {
1633 ResourceMark rm(THREAD);
1634 THROW_(vmSymbols::java_lang_InstantiationException(), nullptr);
1635 }
1636 InstanceKlass* ik = cast(k);
1637 ik->check_valid_for_instantiation(false, CHECK_NULL);
1638 ik->initialize(CHECK_NULL);
1639 return ik->allocate_instance(THREAD);
1640 }
1641
1642 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) {
1643 return instanceHandle(THREAD, allocate_instance(THREAD));
1644 }
1645
1646 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1647 if (is_interface() || is_abstract()) {
1648 ResourceMark rm(THREAD);
1649 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1650 : vmSymbols::java_lang_InstantiationException(), external_name());
1651 }
1652 if (this == vmClasses::Class_klass()) {
1653 ResourceMark rm(THREAD);
1654 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1655 : vmSymbols::java_lang_IllegalAccessException(), external_name());
1656 }
1657 }
1658
1659 ArrayKlass* InstanceKlass::array_klass(int n, TRAPS) {
1660 // Need load-acquire for lock-free read
1661 if (array_klasses_acquire() == nullptr) {
1662
1663 // Recursively lock array allocation
1664 RecursiveLocker rl(MultiArray_lock, THREAD);
1665
1666 // Check if another thread created the array klass while we were waiting for the lock.
1667 if (array_klasses() == nullptr) {
1668 ObjArrayKlass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this, CHECK_NULL);
1669 // use 'release' to pair with lock-free load
1670 release_set_array_klasses(k);
1671 }
1672 }
1673
1674 // array_klasses() will always be set at this point
1675 ObjArrayKlass* ak = array_klasses();
1676 assert(ak != nullptr, "should be set");
1677 return ak->array_klass(n, THREAD);
1678 }
1679
1680 ArrayKlass* InstanceKlass::array_klass_or_null(int n) {
1681 // Need load-acquire for lock-free read
1682 ObjArrayKlass* oak = array_klasses_acquire();
1683 if (oak == nullptr) {
1684 return nullptr;
1685 } else {
1686 return oak->array_klass_or_null(n);
1687 }
1688 }
1689
1690 ArrayKlass* InstanceKlass::array_klass(TRAPS) {
1691 return array_klass(1, THREAD);
1692 }
1693
1694 ArrayKlass* InstanceKlass::array_klass_or_null() {
1695 return array_klass_or_null(1);
1696 }
1697
1698 Method* InstanceKlass::class_initializer() const {
1699 Method* clinit = find_method(
1700 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1701 if (clinit != nullptr && clinit->has_valid_initializer_flags()) {
1702 return clinit;
1703 }
1704 return nullptr;
1705 }
1706
1707 void InstanceKlass::call_class_initializer(TRAPS) {
1708 if (ReplayCompiles &&
1709 (ReplaySuppressInitializers == 1 ||
1710 (ReplaySuppressInitializers >= 2 && class_loader() != nullptr))) {
1711 // Hide the existence of the initializer for the purpose of replaying the compile
1712 return;
1713 }
1714
1715 #if INCLUDE_CDS
1716 // This is needed to ensure the consistency of the archived heap objects.
1717 if (has_archived_enum_objs()) {
1718 assert(is_shared(), "must be");
1719 bool initialized = CDSEnumKlass::initialize_enum_klass(this, CHECK);
1720 if (initialized) {
1721 return;
1722 }
1723 } else if (has_preinitialized_mirror() && CDSConfig::is_loading_heap()) {
1724 log_class_init(THREAD, this);
1725 return;
1726 }
1727 #endif
1728
1729 methodHandle h_method(THREAD, class_initializer());
1730 assert(!is_initialized(), "we cannot initialize twice");
1731 int init_id = log_class_init(THREAD, this);
1732 if (h_method() != nullptr) {
1733 JavaCallArguments args; // No arguments
1734 JavaValue result(T_VOID);
1735 InstanceKlass* outer = THREAD->set_class_being_initialized(this);
1736 jlong bc_start = (CountBytecodesPerThread ? THREAD->bc_counter_value() : BytecodeCounter::counter_value());
1737
1738 elapsedTimer timer;
1739 {
1740 PerfPauseTimer pt(THREAD->current_rt_call_timer(), THREAD->profile_rt_calls());
1741 PauseRuntimeCallProfiling prcp(THREAD, THREAD->profile_rt_calls());
1742
1743 timer.start();
1744 JavaCalls::call(&result, h_method, &args, THREAD); // Static call (no args)
1745 timer.stop();
1746 }
1747
1748 jlong bc_end = (CountBytecodesPerThread ? THREAD->bc_counter_value() : BytecodeCounter::counter_value());
1749
1750 jlong bc_executed = (bc_end - bc_start);
1751 if (UsePerfData && outer == nullptr) { // outermost clinit
1752 THREAD->inc_clinit_bc_counter_value(bc_executed);
1753 ClassLoader::perf_class_init_bytecodes_count()->inc(bc_executed);
1754 }
1755
1756 THREAD->set_class_being_initialized(outer);
1757
1758 LogStreamHandle(Debug, init) log;
1759 if (log.is_enabled()) {
1760 ResourceMark rm(THREAD);
1761 log.print("%d Initialized in %.3fms (total: %ldms); ",
1762 init_id, timer.seconds() * 1000.0, ClassLoader::class_init_time_ms());
1763 if (CountBytecodes || CountBytecodesPerThread) {
1764 log.print("executed %ld bytecodes; ", bc_executed);
1765 }
1766 name()->print_value_on(&log);
1767 log.print_cr(" by thread " PTR_FORMAT " \"%s\" (" PTR_FORMAT ")",
1768 p2i(THREAD), THREAD->name(), p2i(this));
1769 }
1770 }
1771 LogTarget(Info, class, init) lt;
1772 if (lt.is_enabled()) {
1773 ResourceMark rm(THREAD);
1774 LogStream ls(lt);
1775 ls.print("%d Initialized ", init_id);
1776 name()->print_value_on(&ls);
1777 ls.print_cr("%s (" PTR_FORMAT ")", h_method() == nullptr ? "(no method)" : "", p2i(this));
1778 }
1779 }
1780
1781 void InstanceKlass::mask_for(const methodHandle& method, int bci,
1782 InterpreterOopMap* entry_for) {
1783 // Lazily create the _oop_map_cache at first request.
1784 // Load_acquire is needed to safely get instance published with CAS by another thread.
1785 OopMapCache* oop_map_cache = Atomic::load_acquire(&_oop_map_cache);
1786 if (oop_map_cache == nullptr) {
1787 // Try to install new instance atomically.
1788 oop_map_cache = new OopMapCache();
1789 OopMapCache* other = Atomic::cmpxchg(&_oop_map_cache, (OopMapCache*)nullptr, oop_map_cache);
1790 if (other != nullptr) {
1791 // Someone else managed to install before us, ditch local copy and use the existing one.
1792 delete oop_map_cache;
1793 oop_map_cache = other;
1794 }
1795 }
1796 // _oop_map_cache is constant after init; lookup below does its own locking.
1797 oop_map_cache->lookup(method, bci, entry_for);
1798 }
1799
1800 bool InstanceKlass::contains_field_offset(int offset) {
1801 fieldDescriptor fd;
1802 return find_field_from_offset(offset, false, &fd);
1803 }
1804
1805 FieldInfo InstanceKlass::field(int index) const {
1806 for (AllFieldStream fs(this); !fs.done(); fs.next()) {
1807 if (fs.index() == index) {
1808 return fs.to_FieldInfo();
1809 }
1810 }
1811 fatal("Field not found");
1812 return FieldInfo();
1813 }
1814
1815 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1816 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1817 Symbol* f_name = fs.name();
1818 Symbol* f_sig = fs.signature();
1819 if (f_name == name && f_sig == sig) {
1820 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1821 return true;
1822 }
1823 }
1824 return false;
1825 }
1826
1827
1828 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1829 const int n = local_interfaces()->length();
1830 for (int i = 0; i < n; i++) {
1831 Klass* intf1 = local_interfaces()->at(i);
1832 assert(intf1->is_interface(), "just checking type");
1833 // search for field in current interface
1834 if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) {
1835 assert(fd->is_static(), "interface field must be static");
1836 return intf1;
1837 }
1838 // search for field in direct superinterfaces
1839 Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd);
1840 if (intf2 != nullptr) return intf2;
1841 }
1842 // otherwise field lookup fails
1843 return nullptr;
1844 }
1845
1846
1847 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1848 // search order according to newest JVM spec (5.4.3.2, p.167).
1849 // 1) search for field in current klass
1850 if (find_local_field(name, sig, fd)) {
1851 return const_cast<InstanceKlass*>(this);
1852 }
1853 // 2) search for field recursively in direct superinterfaces
1854 { Klass* intf = find_interface_field(name, sig, fd);
1855 if (intf != nullptr) return intf;
1856 }
1857 // 3) apply field lookup recursively if superclass exists
1858 { Klass* supr = super();
1859 if (supr != nullptr) return InstanceKlass::cast(supr)->find_field(name, sig, fd);
1860 }
1861 // 4) otherwise field lookup fails
1862 return nullptr;
1863 }
1864
1865
1866 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
1867 // search order according to newest JVM spec (5.4.3.2, p.167).
1868 // 1) search for field in current klass
1869 if (find_local_field(name, sig, fd)) {
1870 if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
1871 }
1872 // 2) search for field recursively in direct superinterfaces
1873 if (is_static) {
1874 Klass* intf = find_interface_field(name, sig, fd);
1875 if (intf != nullptr) return intf;
1876 }
1877 // 3) apply field lookup recursively if superclass exists
1878 { Klass* supr = super();
1879 if (supr != nullptr) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd);
1880 }
1881 // 4) otherwise field lookup fails
1882 return nullptr;
1883 }
1884
1885
1886 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1887 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1888 if (fs.offset() == offset) {
1889 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1890 if (fd->is_static() == is_static) return true;
1891 }
1892 }
1893 return false;
1894 }
1895
1896
1897 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1898 Klass* klass = const_cast<InstanceKlass*>(this);
1899 while (klass != nullptr) {
1900 if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) {
1901 return true;
1902 }
1903 klass = klass->super();
1904 }
1905 return false;
1906 }
1907
1908
1909 void InstanceKlass::methods_do(void f(Method* method)) {
1910 // Methods aren't stable until they are loaded. This can be read outside
1911 // a lock through the ClassLoaderData for profiling
1912 // Redefined scratch classes are on the list and need to be cleaned
1913 if (!is_loaded() && !is_scratch_class()) {
1914 return;
1915 }
1916
1917 int len = methods()->length();
1918 for (int index = 0; index < len; index++) {
1919 Method* m = methods()->at(index);
1920 assert(m->is_method(), "must be method");
1921 f(m);
1922 }
1923 }
1924
1925
1926 void InstanceKlass::do_local_static_fields(FieldClosure* cl) {
1927 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1928 if (fs.access_flags().is_static()) {
1929 fieldDescriptor& fd = fs.field_descriptor();
1930 cl->do_field(&fd);
1931 }
1932 }
1933 }
1934
1935
1936 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) {
1937 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1938 if (fs.access_flags().is_static()) {
1939 fieldDescriptor& fd = fs.field_descriptor();
1940 f(&fd, mirror, CHECK);
1941 }
1942 }
1943 }
1944
1945 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) {
1946 InstanceKlass* super = superklass();
1947 if (super != nullptr) {
1948 super->do_nonstatic_fields(cl);
1949 }
1950 fieldDescriptor fd;
1951 int length = java_fields_count();
1952 for (int i = 0; i < length; i += 1) {
1953 fd.reinitialize(this, i);
1954 if (!fd.is_static()) {
1955 cl->do_field(&fd);
1956 }
1957 }
1958 }
1959
1960 // first in Pair is offset, second is index.
1961 static int compare_fields_by_offset(Pair<int,int>* a, Pair<int,int>* b) {
1962 return a->first - b->first;
1963 }
1964
1965 void InstanceKlass::print_nonstatic_fields(FieldClosure* cl) {
1966 InstanceKlass* super = superklass();
1967 if (super != nullptr) {
1968 super->print_nonstatic_fields(cl);
1969 }
1970 ResourceMark rm;
1971 fieldDescriptor fd;
1972 // In DebugInfo nonstatic fields are sorted by offset.
1973 GrowableArray<Pair<int,int> > fields_sorted;
1974 int i = 0;
1975 for (AllFieldStream fs(this); !fs.done(); fs.next()) {
1976 if (!fs.access_flags().is_static()) {
1977 fd = fs.field_descriptor();
1978 Pair<int,int> f(fs.offset(), fs.index());
1979 fields_sorted.push(f);
1980 i++;
1981 }
1982 }
1983 if (i > 0) {
1984 int length = i;
1985 assert(length == fields_sorted.length(), "duh");
1986 fields_sorted.sort(compare_fields_by_offset);
1987 for (int i = 0; i < length; i++) {
1988 fd.reinitialize(this, fields_sorted.at(i).second);
1989 assert(!fd.is_static() && fd.offset() == fields_sorted.at(i).first, "only nonstatic fields");
1990 cl->do_field(&fd);
1991 }
1992 }
1993 }
1994
1995 #ifdef ASSERT
1996 static int linear_search(const Array<Method*>* methods,
1997 const Symbol* name,
1998 const Symbol* signature) {
1999 const int len = methods->length();
2000 for (int index = 0; index < len; index++) {
2001 const Method* const m = methods->at(index);
2002 assert(m->is_method(), "must be method");
2003 if (m->signature() == signature && m->name() == name) {
2004 return index;
2005 }
2006 }
2007 return -1;
2008 }
2009 #endif
2010
2011 bool InstanceKlass::_disable_method_binary_search = false;
2012
2013 NOINLINE int linear_search(const Array<Method*>* methods, const Symbol* name) {
2014 int len = methods->length();
2015 int l = 0;
2016 int h = len - 1;
2017 while (l <= h) {
2018 Method* m = methods->at(l);
2019 if (m->name() == name) {
2020 return l;
2021 }
2022 l++;
2023 }
2024 return -1;
2025 }
2026
2027 inline int InstanceKlass::quick_search(const Array<Method*>* methods, const Symbol* name) {
2028 if (_disable_method_binary_search) {
2029 assert(CDSConfig::is_dumping_dynamic_archive(), "must be");
2030 // At the final stage of dynamic dumping, the methods array may not be sorted
2031 // by ascending addresses of their names, so we can't use binary search anymore.
2032 // However, methods with the same name are still laid out consecutively inside the
2033 // methods array, so let's look for the first one that matches.
2034 return linear_search(methods, name);
2035 }
2036
2037 int len = methods->length();
2038 int l = 0;
2039 int h = len - 1;
2040
2041 // methods are sorted by ascending addresses of their names, so do binary search
2042 while (l <= h) {
2043 int mid = (l + h) >> 1;
2044 Method* m = methods->at(mid);
2045 assert(m->is_method(), "must be method");
2046 int res = m->name()->fast_compare(name);
2047 if (res == 0) {
2048 return mid;
2049 } else if (res < 0) {
2050 l = mid + 1;
2051 } else {
2052 h = mid - 1;
2053 }
2054 }
2055 return -1;
2056 }
2057
2058 // find_method looks up the name/signature in the local methods array
2059 Method* InstanceKlass::find_method(const Symbol* name,
2060 const Symbol* signature) const {
2061 return find_method_impl(name, signature,
2062 OverpassLookupMode::find,
2063 StaticLookupMode::find,
2064 PrivateLookupMode::find);
2065 }
2066
2067 Method* InstanceKlass::find_method_impl(const Symbol* name,
2068 const Symbol* signature,
2069 OverpassLookupMode overpass_mode,
2070 StaticLookupMode static_mode,
2071 PrivateLookupMode private_mode) const {
2072 return InstanceKlass::find_method_impl(methods(),
2073 name,
2074 signature,
2075 overpass_mode,
2076 static_mode,
2077 private_mode);
2078 }
2079
2080 // find_instance_method looks up the name/signature in the local methods array
2081 // and skips over static methods
2082 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods,
2083 const Symbol* name,
2084 const Symbol* signature,
2085 PrivateLookupMode private_mode) {
2086 Method* const meth = InstanceKlass::find_method_impl(methods,
2087 name,
2088 signature,
2089 OverpassLookupMode::find,
2090 StaticLookupMode::skip,
2091 private_mode);
2092 assert(((meth == nullptr) || !meth->is_static()),
2093 "find_instance_method should have skipped statics");
2094 return meth;
2095 }
2096
2097 // find_instance_method looks up the name/signature in the local methods array
2098 // and skips over static methods
2099 Method* InstanceKlass::find_instance_method(const Symbol* name,
2100 const Symbol* signature,
2101 PrivateLookupMode private_mode) const {
2102 return InstanceKlass::find_instance_method(methods(), name, signature, private_mode);
2103 }
2104
2105 // Find looks up the name/signature in the local methods array
2106 // and filters on the overpass, static and private flags
2107 // This returns the first one found
2108 // note that the local methods array can have up to one overpass, one static
2109 // and one instance (private or not) with the same name/signature
2110 Method* InstanceKlass::find_local_method(const Symbol* name,
2111 const Symbol* signature,
2112 OverpassLookupMode overpass_mode,
2113 StaticLookupMode static_mode,
2114 PrivateLookupMode private_mode) const {
2115 return InstanceKlass::find_method_impl(methods(),
2116 name,
2117 signature,
2118 overpass_mode,
2119 static_mode,
2120 private_mode);
2121 }
2122
2123 // Find looks up the name/signature in the local methods array
2124 // and filters on the overpass, static and private flags
2125 // This returns the first one found
2126 // note that the local methods array can have up to one overpass, one static
2127 // and one instance (private or not) with the same name/signature
2128 Method* InstanceKlass::find_local_method(const Array<Method*>* methods,
2129 const Symbol* name,
2130 const Symbol* signature,
2131 OverpassLookupMode overpass_mode,
2132 StaticLookupMode static_mode,
2133 PrivateLookupMode private_mode) {
2134 return InstanceKlass::find_method_impl(methods,
2135 name,
2136 signature,
2137 overpass_mode,
2138 static_mode,
2139 private_mode);
2140 }
2141
2142 Method* InstanceKlass::find_method(const Array<Method*>* methods,
2143 const Symbol* name,
2144 const Symbol* signature) {
2145 return InstanceKlass::find_method_impl(methods,
2146 name,
2147 signature,
2148 OverpassLookupMode::find,
2149 StaticLookupMode::find,
2150 PrivateLookupMode::find);
2151 }
2152
2153 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods,
2154 const Symbol* name,
2155 const Symbol* signature,
2156 OverpassLookupMode overpass_mode,
2157 StaticLookupMode static_mode,
2158 PrivateLookupMode private_mode) {
2159 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode);
2160 return hit >= 0 ? methods->at(hit): nullptr;
2161 }
2162
2163 // true if method matches signature and conforms to skipping_X conditions.
2164 static bool method_matches(const Method* m,
2165 const Symbol* signature,
2166 bool skipping_overpass,
2167 bool skipping_static,
2168 bool skipping_private) {
2169 return ((m->signature() == signature) &&
2170 (!skipping_overpass || !m->is_overpass()) &&
2171 (!skipping_static || !m->is_static()) &&
2172 (!skipping_private || !m->is_private()));
2173 }
2174
2175 // Used directly for default_methods to find the index into the
2176 // default_vtable_indices, and indirectly by find_method
2177 // find_method_index looks in the local methods array to return the index
2178 // of the matching name/signature. If, overpass methods are being ignored,
2179 // the search continues to find a potential non-overpass match. This capability
2180 // is important during method resolution to prefer a static method, for example,
2181 // over an overpass method.
2182 // There is the possibility in any _method's array to have the same name/signature
2183 // for a static method, an overpass method and a local instance method
2184 // To correctly catch a given method, the search criteria may need
2185 // to explicitly skip the other two. For local instance methods, it
2186 // is often necessary to skip private methods
2187 int InstanceKlass::find_method_index(const Array<Method*>* methods,
2188 const Symbol* name,
2189 const Symbol* signature,
2190 OverpassLookupMode overpass_mode,
2191 StaticLookupMode static_mode,
2192 PrivateLookupMode private_mode) {
2193 const bool skipping_overpass = (overpass_mode == OverpassLookupMode::skip);
2194 const bool skipping_static = (static_mode == StaticLookupMode::skip);
2195 const bool skipping_private = (private_mode == PrivateLookupMode::skip);
2196 const int hit = quick_search(methods, name);
2197 if (hit != -1) {
2198 const Method* const m = methods->at(hit);
2199
2200 // Do linear search to find matching signature. First, quick check
2201 // for common case, ignoring overpasses if requested.
2202 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
2203 return hit;
2204 }
2205
2206 // search downwards through overloaded methods
2207 int i;
2208 for (i = hit - 1; i >= 0; --i) {
2209 const Method* const m = methods->at(i);
2210 assert(m->is_method(), "must be method");
2211 if (m->name() != name) {
2212 break;
2213 }
2214 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
2215 return i;
2216 }
2217 }
2218 // search upwards
2219 for (i = hit + 1; i < methods->length(); ++i) {
2220 const Method* const m = methods->at(i);
2221 assert(m->is_method(), "must be method");
2222 if (m->name() != name) {
2223 break;
2224 }
2225 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
2226 return i;
2227 }
2228 }
2229 // not found
2230 #ifdef ASSERT
2231 const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 :
2232 linear_search(methods, name, signature);
2233 assert(-1 == index, "binary search should have found entry %d", index);
2234 #endif
2235 }
2236 return -1;
2237 }
2238
2239 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const {
2240 return find_method_by_name(methods(), name, end);
2241 }
2242
2243 int InstanceKlass::find_method_by_name(const Array<Method*>* methods,
2244 const Symbol* name,
2245 int* end_ptr) {
2246 assert(end_ptr != nullptr, "just checking");
2247 int start = quick_search(methods, name);
2248 int end = start + 1;
2249 if (start != -1) {
2250 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
2251 while (end < methods->length() && (methods->at(end))->name() == name) ++end;
2252 *end_ptr = end;
2253 return start;
2254 }
2255 return -1;
2256 }
2257
2258 // uncached_lookup_method searches both the local class methods array and all
2259 // superclasses methods arrays, skipping any overpass methods in superclasses,
2260 // and possibly skipping private methods.
2261 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
2262 const Symbol* signature,
2263 OverpassLookupMode overpass_mode,
2264 PrivateLookupMode private_mode) const {
2265 OverpassLookupMode overpass_local_mode = overpass_mode;
2266 const Klass* klass = this;
2267 while (klass != nullptr) {
2268 Method* const method = InstanceKlass::cast(klass)->find_method_impl(name,
2269 signature,
2270 overpass_local_mode,
2271 StaticLookupMode::find,
2272 private_mode);
2273 if (method != nullptr) {
2274 return method;
2275 }
2276 klass = klass->super();
2277 overpass_local_mode = OverpassLookupMode::skip; // Always ignore overpass methods in superclasses
2278 }
2279 return nullptr;
2280 }
2281
2282 #ifdef ASSERT
2283 // search through class hierarchy and return true if this class or
2284 // one of the superclasses was redefined
2285 bool InstanceKlass::has_redefined_this_or_super() const {
2286 const Klass* klass = this;
2287 while (klass != nullptr) {
2288 if (InstanceKlass::cast(klass)->has_been_redefined()) {
2289 return true;
2290 }
2291 klass = klass->super();
2292 }
2293 return false;
2294 }
2295 #endif
2296
2297 // lookup a method in the default methods list then in all transitive interfaces
2298 // Do NOT return private or static methods
2299 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
2300 Symbol* signature) const {
2301 Method* m = nullptr;
2302 if (default_methods() != nullptr) {
2303 m = find_method(default_methods(), name, signature);
2304 }
2305 // Look up interfaces
2306 if (m == nullptr) {
2307 m = lookup_method_in_all_interfaces(name, signature, DefaultsLookupMode::find);
2308 }
2309 return m;
2310 }
2311
2312 // lookup a method in all the interfaces that this class implements
2313 // Do NOT return private or static methods, new in JDK8 which are not externally visible
2314 // They should only be found in the initial InterfaceMethodRef
2315 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
2316 Symbol* signature,
2317 DefaultsLookupMode defaults_mode) const {
2318 Array<InstanceKlass*>* all_ifs = transitive_interfaces();
2319 int num_ifs = all_ifs->length();
2320 InstanceKlass *ik = nullptr;
2321 for (int i = 0; i < num_ifs; i++) {
2322 ik = all_ifs->at(i);
2323 Method* m = ik->lookup_method(name, signature);
2324 if (m != nullptr && m->is_public() && !m->is_static() &&
2325 ((defaults_mode != DefaultsLookupMode::skip) || !m->is_default_method())) {
2326 return m;
2327 }
2328 }
2329 return nullptr;
2330 }
2331
2332 PrintClassClosure::PrintClassClosure(outputStream* st, bool verbose)
2333 :_st(st), _verbose(verbose) {
2334 ResourceMark rm;
2335 _st->print("%-18s ", "KlassAddr");
2336 _st->print("%-4s ", "Size");
2337 _st->print("%-20s ", "State");
2338 _st->print("%-7s ", "Flags");
2339 _st->print("%-5s ", "ClassName");
2340 _st->cr();
2341 }
2342
2343 void PrintClassClosure::do_klass(Klass* k) {
2344 ResourceMark rm;
2345 // klass pointer
2346 _st->print(PTR_FORMAT " ", p2i(k));
2347 // klass size
2348 _st->print("%4d ", k->size());
2349 // initialization state
2350 if (k->is_instance_klass()) {
2351 _st->print("%-20s ",InstanceKlass::cast(k)->init_state_name());
2352 } else {
2353 _st->print("%-20s ","");
2354 }
2355 // misc flags(Changes should synced with ClassesDCmd::ClassesDCmd help doc)
2356 char buf[10];
2357 int i = 0;
2358 if (k->has_finalizer()) buf[i++] = 'F';
2359 if (k->is_instance_klass()) {
2360 InstanceKlass* ik = InstanceKlass::cast(k);
2361 if (ik->has_final_method()) buf[i++] = 'f';
2362 if (ik->is_rewritten()) buf[i++] = 'W';
2363 if (ik->is_contended()) buf[i++] = 'C';
2364 if (ik->has_been_redefined()) buf[i++] = 'R';
2365 if (ik->is_shared()) buf[i++] = 'S';
2366 }
2367 buf[i++] = '\0';
2368 _st->print("%-7s ", buf);
2369 // klass name
2370 _st->print("%-5s ", k->external_name());
2371 // end
2372 _st->cr();
2373 if (_verbose) {
2374 k->print_on(_st);
2375 }
2376 }
2377
2378 /* jni_id_for for jfieldIds only */
2379 JNIid* InstanceKlass::jni_id_for(int offset) {
2380 MutexLocker ml(JfieldIdCreation_lock);
2381 JNIid* probe = jni_ids() == nullptr ? nullptr : jni_ids()->find(offset);
2382 if (probe == nullptr) {
2383 // Allocate new static field identifier
2384 probe = new JNIid(this, offset, jni_ids());
2385 set_jni_ids(probe);
2386 }
2387 return probe;
2388 }
2389
2390 u2 InstanceKlass::enclosing_method_data(int offset) const {
2391 const Array<jushort>* const inner_class_list = inner_classes();
2392 if (inner_class_list == nullptr) {
2393 return 0;
2394 }
2395 const int length = inner_class_list->length();
2396 if (length % inner_class_next_offset == 0) {
2397 return 0;
2398 }
2399 const int index = length - enclosing_method_attribute_size;
2400 assert(offset < enclosing_method_attribute_size, "invalid offset");
2401 return inner_class_list->at(index + offset);
2402 }
2403
2404 void InstanceKlass::set_enclosing_method_indices(u2 class_index,
2405 u2 method_index) {
2406 Array<jushort>* inner_class_list = inner_classes();
2407 assert (inner_class_list != nullptr, "_inner_classes list is not set up");
2408 int length = inner_class_list->length();
2409 if (length % inner_class_next_offset == enclosing_method_attribute_size) {
2410 int index = length - enclosing_method_attribute_size;
2411 inner_class_list->at_put(
2412 index + enclosing_method_class_index_offset, class_index);
2413 inner_class_list->at_put(
2414 index + enclosing_method_method_index_offset, method_index);
2415 }
2416 }
2417
2418 jmethodID InstanceKlass::update_jmethod_id(jmethodID* jmeths, Method* method, int idnum) {
2419 if (method->is_old() && !method->is_obsolete()) {
2420 // If the method passed in is old (but not obsolete), use the current version.
2421 method = method_with_idnum((int)idnum);
2422 assert(method != nullptr, "old and but not obsolete, so should exist");
2423 }
2424 jmethodID new_id = Method::make_jmethod_id(class_loader_data(), method);
2425 Atomic::release_store(&jmeths[idnum + 1], new_id);
2426 return new_id;
2427 }
2428
2429 // Lookup or create a jmethodID.
2430 // This code is called by the VMThread and JavaThreads so the
2431 // locking has to be done very carefully to avoid deadlocks
2432 // and/or other cache consistency problems.
2433 //
2434 jmethodID InstanceKlass::get_jmethod_id(const methodHandle& method_h) {
2435 Method* method = method_h();
2436 int idnum = method->method_idnum();
2437 jmethodID* jmeths = methods_jmethod_ids_acquire();
2438
2439 // We use a double-check locking idiom here because this cache is
2440 // performance sensitive. In the normal system, this cache only
2441 // transitions from null to non-null which is safe because we use
2442 // release_set_methods_jmethod_ids() to advertise the new cache.
2443 // A partially constructed cache should never be seen by a racing
2444 // thread. We also use release_store() to save a new jmethodID
2445 // in the cache so a partially constructed jmethodID should never be
2446 // seen either. Cache reads of existing jmethodIDs proceed without a
2447 // lock, but cache writes of a new jmethodID requires uniqueness and
2448 // creation of the cache itself requires no leaks so a lock is
2449 // acquired in those two cases.
2450 //
2451 // If the RedefineClasses() API has been used, then this cache grows
2452 // in the redefinition safepoint.
2453
2454 if (jmeths == nullptr) {
2455 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2456 jmeths = methods_jmethod_ids_acquire();
2457 // Still null?
2458 if (jmeths == nullptr) {
2459 size_t size = idnum_allocated_count();
2460 assert(size > (size_t)idnum, "should already have space");
2461 jmeths = NEW_C_HEAP_ARRAY(jmethodID, size + 1, mtClass);
2462 memset(jmeths, 0, (size + 1) * sizeof(jmethodID));
2463 // cache size is stored in element[0], other elements offset by one
2464 jmeths[0] = (jmethodID)size;
2465 jmethodID new_id = update_jmethod_id(jmeths, method, idnum);
2466
2467 // publish jmeths
2468 release_set_methods_jmethod_ids(jmeths);
2469 return new_id;
2470 }
2471 }
2472
2473 jmethodID id = Atomic::load_acquire(&jmeths[idnum + 1]);
2474 if (id == nullptr) {
2475 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2476 id = jmeths[idnum + 1];
2477 // Still null?
2478 if (id == nullptr) {
2479 return update_jmethod_id(jmeths, method, idnum);
2480 }
2481 }
2482 return id;
2483 }
2484
2485 void InstanceKlass::update_methods_jmethod_cache() {
2486 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
2487 jmethodID* cache = _methods_jmethod_ids;
2488 if (cache != nullptr) {
2489 size_t size = idnum_allocated_count();
2490 size_t old_size = (size_t)cache[0];
2491 if (old_size < size + 1) {
2492 // Allocate a larger one and copy entries to the new one.
2493 // They've already been updated to point to new methods where applicable (i.e., not obsolete).
2494 jmethodID* new_cache = NEW_C_HEAP_ARRAY(jmethodID, size + 1, mtClass);
2495 memset(new_cache, 0, (size + 1) * sizeof(jmethodID));
2496 // The cache size is stored in element[0]; the other elements are offset by one.
2497 new_cache[0] = (jmethodID)size;
2498
2499 for (int i = 1; i <= (int)old_size; i++) {
2500 new_cache[i] = cache[i];
2501 }
2502 _methods_jmethod_ids = new_cache;
2503 FREE_C_HEAP_ARRAY(jmethodID, cache);
2504 }
2505 }
2506 }
2507
2508 // Figure out how many jmethodIDs haven't been allocated, and make
2509 // sure space for them is pre-allocated. This makes getting all
2510 // method ids much, much faster with classes with more than 8
2511 // methods, and has a *substantial* effect on performance with jvmti
2512 // code that loads all jmethodIDs for all classes.
2513 void InstanceKlass::ensure_space_for_methodids(int start_offset) {
2514 int new_jmeths = 0;
2515 int length = methods()->length();
2516 for (int index = start_offset; index < length; index++) {
2517 Method* m = methods()->at(index);
2518 jmethodID id = m->find_jmethod_id_or_null();
2519 if (id == nullptr) {
2520 new_jmeths++;
2521 }
2522 }
2523 if (new_jmeths != 0) {
2524 Method::ensure_jmethod_ids(class_loader_data(), new_jmeths);
2525 }
2526 }
2527
2528 // Lookup a jmethodID, null if not found. Do no blocking, no allocations, no handles
2529 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
2530 int idnum = method->method_idnum();
2531 jmethodID* jmeths = methods_jmethod_ids_acquire();
2532 return (jmeths != nullptr) ? jmeths[idnum + 1] : nullptr;
2533 }
2534
2535 inline DependencyContext InstanceKlass::dependencies() {
2536 DependencyContext dep_context(&_dep_context, &_dep_context_last_cleaned);
2537 return dep_context;
2538 }
2539
2540 void InstanceKlass::mark_dependent_nmethods(DeoptimizationScope* deopt_scope, KlassDepChange& changes) {
2541 dependencies().mark_dependent_nmethods(deopt_scope, changes, this);
2542 }
2543
2544 void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
2545 dependencies().add_dependent_nmethod(nm);
2546 }
2547
2548 void InstanceKlass::clean_dependency_context() {
2549 dependencies().clean_unloading_dependents();
2550 }
2551
2552 #ifndef PRODUCT
2553 void InstanceKlass::print_dependent_nmethods(bool verbose) {
2554 dependencies().print_dependent_nmethods(verbose);
2555 }
2556
2557 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
2558 return dependencies().is_dependent_nmethod(nm);
2559 }
2560 #endif //PRODUCT
2561
2562 void InstanceKlass::clean_weak_instanceklass_links() {
2563 clean_implementors_list();
2564 clean_method_data();
2565 }
2566
2567 void InstanceKlass::clean_implementors_list() {
2568 assert(is_loader_alive(), "this klass should be live");
2569 if (is_interface()) {
2570 assert (ClassUnloading, "only called for ClassUnloading");
2571 for (;;) {
2572 // Use load_acquire due to competing with inserts
2573 InstanceKlass* volatile* iklass = adr_implementor();
2574 assert(iklass != nullptr, "Klass must not be null");
2575 InstanceKlass* impl = Atomic::load_acquire(iklass);
2576 if (impl != nullptr && !impl->is_loader_alive()) {
2577 // null this field, might be an unloaded instance klass or null
2578 if (Atomic::cmpxchg(iklass, impl, (InstanceKlass*)nullptr) == impl) {
2579 // Successfully unlinking implementor.
2580 if (log_is_enabled(Trace, class, unload)) {
2581 ResourceMark rm;
2582 log_trace(class, unload)("unlinking class (implementor): %s", impl->external_name());
2583 }
2584 return;
2585 }
2586 } else {
2587 return;
2588 }
2589 }
2590 }
2591 }
2592
2593 void InstanceKlass::clean_method_data() {
2594 for (int m = 0; m < methods()->length(); m++) {
2595 MethodData* mdo = methods()->at(m)->method_data();
2596 if (mdo != nullptr) {
2597 mdo->clean_method_data(/*always_clean*/false);
2598 }
2599 }
2600 }
2601
2602 void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) {
2603 Klass::metaspace_pointers_do(it);
2604
2605 if (log_is_enabled(Trace, cds)) {
2606 ResourceMark rm;
2607 log_trace(cds)("Iter(InstanceKlass): %p (%s)", this, external_name());
2608 }
2609
2610 it->push(&_annotations);
2611 it->push((Klass**)&_array_klasses);
2612 if (!is_rewritten()) {
2613 it->push(&_constants, MetaspaceClosure::_writable);
2614 } else {
2615 it->push(&_constants);
2616 }
2617 it->push(&_inner_classes);
2618 #if INCLUDE_JVMTI
2619 it->push(&_previous_versions);
2620 #endif
2621 #if INCLUDE_CDS
2622 // For "old" classes with methods containing the jsr bytecode, the _methods array will
2623 // be rewritten during runtime (see Rewriter::rewrite_jsrs()). So setting the _methods to
2624 // be writable. The length check on the _methods is necessary because classes which
2625 // don't have any methods share the Universe::_the_empty_method_array which is in the RO region.
2626 if (_methods != nullptr && _methods->length() > 0 &&
2627 !can_be_verified_at_dumptime() && methods_contain_jsr_bytecode()) {
2628 // To handle jsr bytecode, new Method* maybe stored into _methods
2629 it->push(&_methods, MetaspaceClosure::_writable);
2630 } else {
2631 #endif
2632 it->push(&_methods);
2633 #if INCLUDE_CDS
2634 }
2635 #endif
2636 it->push(&_default_methods);
2637 it->push(&_local_interfaces);
2638 it->push(&_transitive_interfaces);
2639 it->push(&_method_ordering);
2640 if (!is_rewritten()) {
2641 it->push(&_default_vtable_indices, MetaspaceClosure::_writable);
2642 } else {
2643 it->push(&_default_vtable_indices);
2644 }
2645
2646 it->push(&_fieldinfo_stream);
2647 // _fields_status might be written into by Rewriter::scan_method() -> fd.set_has_initialized_final_update()
2648 it->push(&_fields_status, MetaspaceClosure::_writable);
2649
2650 if (itable_length() > 0) {
2651 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2652 int method_table_offset_in_words = ioe->offset()/wordSize;
2653 int itable_offset_in_words = (int)(start_of_itable() - (intptr_t*)this);
2654
2655 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words)
2656 / itableOffsetEntry::size();
2657
2658 for (int i = 0; i < nof_interfaces; i ++, ioe ++) {
2659 if (ioe->interface_klass() != nullptr) {
2660 it->push(ioe->interface_klass_addr());
2661 itableMethodEntry* ime = ioe->first_method_entry(this);
2662 int n = klassItable::method_count_for_interface(ioe->interface_klass());
2663 for (int index = 0; index < n; index ++) {
2664 it->push(ime[index].method_addr());
2665 }
2666 }
2667 }
2668 }
2669
2670 it->push(&_nest_host);
2671 it->push(&_nest_members);
2672 it->push(&_permitted_subclasses);
2673 it->push(&_record_components);
2674 }
2675
2676 #if INCLUDE_CDS
2677 void InstanceKlass::remove_unshareable_info() {
2678 if (is_linked()) {
2679 assert(can_be_verified_at_dumptime(), "must be");
2680 // Remember this so we can avoid walking the hierarchy at runtime.
2681 set_verified_at_dump_time();
2682 }
2683 _misc_flags.set_has_init_deps_processed(false);
2684
2685 Klass::remove_unshareable_info();
2686
2687 if (SystemDictionaryShared::has_class_failed_verification(this)) {
2688 // Classes are attempted to link during dumping and may fail,
2689 // but these classes are still in the dictionary and class list in CLD.
2690 // If the class has failed verification, there is nothing else to remove.
2691 return;
2692 }
2693
2694 // Reset to the 'allocated' state to prevent any premature accessing to
2695 // a shared class at runtime while the class is still being loaded and
2696 // restored. A class' init_state is set to 'loaded' at runtime when it's
2697 // being added to class hierarchy (see InstanceKlass:::add_to_hierarchy()).
2698 _init_state = allocated;
2699
2700 { // Otherwise this needs to take out the Compile_lock.
2701 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
2702 init_implementor();
2703 }
2704
2705 // ConstantPool is cleaned separately. See ArchiveBuilder::make_klasses_shareable()
2706 // constants()->remove_unshareable_info();
2707
2708 for (int i = 0; i < methods()->length(); i++) {
2709 Method* m = methods()->at(i);
2710 m->remove_unshareable_info();
2711 }
2712
2713 // do array classes also.
2714 if (array_klasses() != nullptr) {
2715 array_klasses()->remove_unshareable_info();
2716 }
2717
2718 // These are not allocated from metaspace. They are safe to set to null.
2719 _source_debug_extension = nullptr;
2720 _dep_context = nullptr;
2721 _osr_nmethods_head = nullptr;
2722 #if INCLUDE_JVMTI
2723 _breakpoints = nullptr;
2724 _previous_versions = nullptr;
2725 _cached_class_file = nullptr;
2726 _jvmti_cached_class_field_map = nullptr;
2727 #endif
2728
2729 _init_thread = nullptr;
2730 _methods_jmethod_ids = nullptr;
2731 _jni_ids = nullptr;
2732 _oop_map_cache = nullptr;
2733 if (ArchiveInvokeDynamic && HeapShared::is_lambda_proxy_klass(this)) {
2734 // keep _nest_host
2735 } else {
2736 // clear _nest_host to ensure re-load at runtime
2737 _nest_host = nullptr;
2738 }
2739 init_shared_package_entry();
2740 _dep_context_last_cleaned = 0;
2741 _init_monitor = nullptr;
2742 DEBUG_ONLY(_shared_class_load_count = 0);
2743
2744 remove_unshareable_flags();
2745 }
2746
2747 void InstanceKlass::remove_unshareable_flags() {
2748 // clear all the flags/stats that shouldn't be in the archived version
2749 assert(!is_scratch_class(), "must be");
2750 assert(!has_been_redefined(), "must be");
2751 #if INCLUDE_JVMTI
2752 set_is_being_redefined(false);
2753 #endif
2754 set_has_resolved_methods(false);
2755 }
2756
2757 void InstanceKlass::remove_java_mirror() {
2758 Klass::remove_java_mirror();
2759
2760 // do array classes also.
2761 if (array_klasses() != nullptr) {
2762 array_klasses()->remove_java_mirror();
2763 }
2764 }
2765
2766 void InstanceKlass::init_shared_package_entry() {
2767 assert(CDSConfig::is_dumping_archive(), "must be");
2768 #if !INCLUDE_CDS_JAVA_HEAP
2769 _package_entry = nullptr;
2770 #else
2771 if (CDSConfig::is_dumping_full_module_graph()) {
2772 if (is_shared_unregistered_class()) {
2773 _package_entry = nullptr;
2774 } else {
2775 _package_entry = PackageEntry::get_archived_entry(_package_entry);
2776 }
2777 } else if (CDSConfig::is_dumping_dynamic_archive() &&
2778 CDSConfig::is_using_full_module_graph() &&
2779 MetaspaceShared::is_in_shared_metaspace(_package_entry)) {
2780 // _package_entry is an archived package in the base archive. Leave it as is.
2781 } else {
2782 _package_entry = nullptr;
2783 }
2784 ArchivePtrMarker::mark_pointer((address**)&_package_entry);
2785 #endif
2786 }
2787
2788 void InstanceKlass::compute_has_loops_flag_for_methods() {
2789 Array<Method*>* methods = this->methods();
2790 for (int index = 0; index < methods->length(); ++index) {
2791 Method* m = methods->at(index);
2792 if (!m->is_overpass()) { // work around JDK-8305771
2793 m->compute_has_loops_flag();
2794 }
2795 }
2796 }
2797
2798 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain,
2799 PackageEntry* pkg_entry, TRAPS) {
2800 // InstanceKlass::add_to_hierarchy() sets the init_state to loaded
2801 // before the InstanceKlass is added to the SystemDictionary. Make
2802 // sure the current state is <loaded.
2803 assert(!is_loaded(), "invalid init state");
2804 assert(!shared_loading_failed(), "Must not try to load failed class again");
2805 set_package(loader_data, pkg_entry, CHECK);
2806 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
2807
2808 Array<Method*>* methods = this->methods();
2809 int num_methods = methods->length();
2810 for (int index = 0; index < num_methods; ++index) {
2811 methods->at(index)->restore_unshareable_info(CHECK);
2812 }
2813 #if INCLUDE_JVMTI
2814 if (JvmtiExport::has_redefined_a_class()) {
2815 // Reinitialize vtable because RedefineClasses may have changed some
2816 // entries in this vtable for super classes so the CDS vtable might
2817 // point to old or obsolete entries. RedefineClasses doesn't fix up
2818 // vtables in the shared system dictionary, only the main one.
2819 // It also redefines the itable too so fix that too.
2820 // First fix any default methods that point to a super class that may
2821 // have been redefined.
2822 bool trace_name_printed = false;
2823 adjust_default_methods(&trace_name_printed);
2824 vtable().initialize_vtable();
2825 itable().initialize_itable();
2826 }
2827 #endif
2828
2829 // restore constant pool resolved references
2830 constants()->restore_unshareable_info(CHECK);
2831
2832 if (array_klasses() != nullptr) {
2833 // To get a consistent list of classes we need MultiArray_lock to ensure
2834 // array classes aren't observed while they are being restored.
2835 RecursiveLocker rl(MultiArray_lock, THREAD);
2836 assert(this == array_klasses()->bottom_klass(), "sanity");
2837 // Array classes have null protection domain.
2838 // --> see ArrayKlass::complete_create_array_klass()
2839 array_klasses()->restore_unshareable_info(class_loader_data(), Handle(), CHECK);
2840 }
2841
2842 // Initialize @ValueBased class annotation
2843 if (DiagnoseSyncOnValueBasedClasses && has_value_based_class_annotation()) {
2844 set_is_value_based();
2845 }
2846
2847 // restore the monitor
2848 _init_monitor = create_init_monitor("InstanceKlassInitMonitorRestored_lock");
2849 }
2850
2851 bool InstanceKlass::can_be_verified_at_dumptime() const {
2852 if (CDSConfig::preserve_all_dumptime_verification_states(this)) {
2853 return true;
2854 }
2855
2856 if (MetaspaceShared::is_in_shared_metaspace(this)) {
2857 // This is a class that was dumped into the base archive, so we know
2858 // it was verified at dump time.
2859 return true;
2860 }
2861
2862 if (ArchiveInvokeDynamic) {
2863 // FIXME: this works around JDK-8315719
2864 return true;
2865 }
2866
2867 // Check if a class or any of its supertypes has a version older than 50.
2868 // CDS will not perform verification of old classes during dump time because
2869 // without changing the old verifier, the verification constraint cannot be
2870 // retrieved during dump time.
2871 // Verification of archived old classes will be performed during run time.
2872 if (major_version() < 50 /*JAVA_6_VERSION*/) {
2873 return false;
2874 }
2875 if (java_super() != nullptr && !java_super()->can_be_verified_at_dumptime()) {
2876 return false;
2877 }
2878 Array<InstanceKlass*>* interfaces = local_interfaces();
2879 int len = interfaces->length();
2880 for (int i = 0; i < len; i++) {
2881 if (!interfaces->at(i)->can_be_verified_at_dumptime()) {
2882 return false;
2883 }
2884 }
2885 return true;
2886 }
2887
2888 bool InstanceKlass::methods_contain_jsr_bytecode() const {
2889 Thread* thread = Thread::current();
2890 for (int i = 0; i < _methods->length(); i++) {
2891 methodHandle m(thread, _methods->at(i));
2892 BytecodeStream bcs(m);
2893 while (!bcs.is_last_bytecode()) {
2894 Bytecodes::Code opcode = bcs.next();
2895 if (opcode == Bytecodes::_jsr || opcode == Bytecodes::_jsr_w) {
2896 return true;
2897 }
2898 }
2899 }
2900 return false;
2901 }
2902
2903 int InstanceKlass::shared_class_loader_type() const {
2904 if (is_shared_boot_class()) {
2905 return ClassLoader::BOOT_LOADER;
2906 } else if (is_shared_platform_class()) {
2907 return ClassLoader::PLATFORM_LOADER;
2908 } else if (is_shared_app_class()) {
2909 return ClassLoader::APP_LOADER;
2910 } else {
2911 return ClassLoader::OTHER;
2912 }
2913 }
2914 #endif // INCLUDE_CDS
2915
2916 #if INCLUDE_JVMTI
2917 static void clear_all_breakpoints(Method* m) {
2918 m->clear_all_breakpoints();
2919 }
2920 #endif
2921
2922 void InstanceKlass::unload_class(InstanceKlass* ik) {
2923 // Release dependencies.
2924 ik->dependencies().remove_all_dependents();
2925
2926 // notify the debugger
2927 if (JvmtiExport::should_post_class_unload()) {
2928 JvmtiExport::post_class_unload(ik);
2929 }
2930
2931 // notify ClassLoadingService of class unload
2932 ClassLoadingService::notify_class_unloaded(ik);
2933
2934 SystemDictionaryShared::handle_class_unloading(ik);
2935
2936 if (log_is_enabled(Info, class, unload)) {
2937 ResourceMark rm;
2938 log_info(class, unload)("unloading class %s " PTR_FORMAT, ik->external_name(), p2i(ik));
2939 }
2940
2941 Events::log_class_unloading(Thread::current(), ik);
2942
2943 #if INCLUDE_JFR
2944 assert(ik != nullptr, "invariant");
2945 EventClassUnload event;
2946 event.set_unloadedClass(ik);
2947 event.set_definingClassLoader(ik->class_loader_data());
2948 event.commit();
2949 #endif
2950 }
2951
2952 static void method_release_C_heap_structures(Method* m) {
2953 m->release_C_heap_structures();
2954 }
2955
2956 // Called also by InstanceKlass::deallocate_contents, with false for release_sub_metadata.
2957 void InstanceKlass::release_C_heap_structures(bool release_sub_metadata) {
2958 // Clean up C heap
2959 Klass::release_C_heap_structures();
2960
2961 // Deallocate and call destructors for MDO mutexes
2962 if (release_sub_metadata) {
2963 methods_do(method_release_C_heap_structures);
2964 }
2965
2966 // Destroy the init_monitor
2967 delete _init_monitor;
2968
2969 // Deallocate oop map cache
2970 if (_oop_map_cache != nullptr) {
2971 delete _oop_map_cache;
2972 _oop_map_cache = nullptr;
2973 }
2974
2975 // Deallocate JNI identifiers for jfieldIDs
2976 JNIid::deallocate(jni_ids());
2977 set_jni_ids(nullptr);
2978
2979 jmethodID* jmeths = methods_jmethod_ids_acquire();
2980 if (jmeths != nullptr) {
2981 release_set_methods_jmethod_ids(nullptr);
2982 FreeHeap(jmeths);
2983 }
2984
2985 assert(_dep_context == nullptr,
2986 "dependencies should already be cleaned");
2987
2988 #if INCLUDE_JVMTI
2989 // Deallocate breakpoint records
2990 if (breakpoints() != 0x0) {
2991 methods_do(clear_all_breakpoints);
2992 assert(breakpoints() == 0x0, "should have cleared breakpoints");
2993 }
2994
2995 // deallocate the cached class file
2996 if (_cached_class_file != nullptr) {
2997 os::free(_cached_class_file);
2998 _cached_class_file = nullptr;
2999 }
3000 #endif
3001
3002 FREE_C_HEAP_ARRAY(char, _source_debug_extension);
3003
3004 if (release_sub_metadata) {
3005 constants()->release_C_heap_structures();
3006 }
3007 }
3008
3009 // The constant pool is on stack if any of the methods are executing or
3010 // referenced by handles.
3011 bool InstanceKlass::on_stack() const {
3012 return _constants->on_stack();
3013 }
3014
3015 Symbol* InstanceKlass::source_file_name() const { return _constants->source_file_name(); }
3016 u2 InstanceKlass::source_file_name_index() const { return _constants->source_file_name_index(); }
3017 void InstanceKlass::set_source_file_name_index(u2 sourcefile_index) { _constants->set_source_file_name_index(sourcefile_index); }
3018
3019 // minor and major version numbers of class file
3020 u2 InstanceKlass::minor_version() const { return _constants->minor_version(); }
3021 void InstanceKlass::set_minor_version(u2 minor_version) { _constants->set_minor_version(minor_version); }
3022 u2 InstanceKlass::major_version() const { return _constants->major_version(); }
3023 void InstanceKlass::set_major_version(u2 major_version) { _constants->set_major_version(major_version); }
3024
3025 InstanceKlass* InstanceKlass::get_klass_version(int version) {
3026 for (InstanceKlass* ik = this; ik != nullptr; ik = ik->previous_versions()) {
3027 if (ik->constants()->version() == version) {
3028 return ik;
3029 }
3030 }
3031 return nullptr;
3032 }
3033
3034 void InstanceKlass::set_source_debug_extension(const char* array, int length) {
3035 if (array == nullptr) {
3036 _source_debug_extension = nullptr;
3037 } else {
3038 // Adding one to the attribute length in order to store a null terminator
3039 // character could cause an overflow because the attribute length is
3040 // already coded with an u4 in the classfile, but in practice, it's
3041 // unlikely to happen.
3042 assert((length+1) > length, "Overflow checking");
3043 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
3044 for (int i = 0; i < length; i++) {
3045 sde[i] = array[i];
3046 }
3047 sde[length] = '\0';
3048 _source_debug_extension = sde;
3049 }
3050 }
3051
3052 Symbol* InstanceKlass::generic_signature() const { return _constants->generic_signature(); }
3053 u2 InstanceKlass::generic_signature_index() const { return _constants->generic_signature_index(); }
3054 void InstanceKlass::set_generic_signature_index(u2 sig_index) { _constants->set_generic_signature_index(sig_index); }
3055
3056 const char* InstanceKlass::signature_name() const {
3057
3058 // Get the internal name as a c string
3059 const char* src = (const char*) (name()->as_C_string());
3060 const int src_length = (int)strlen(src);
3061
3062 char* dest = NEW_RESOURCE_ARRAY(char, src_length + 3);
3063
3064 // Add L as type indicator
3065 int dest_index = 0;
3066 dest[dest_index++] = JVM_SIGNATURE_CLASS;
3067
3068 // Add the actual class name
3069 for (int src_index = 0; src_index < src_length; ) {
3070 dest[dest_index++] = src[src_index++];
3071 }
3072
3073 if (is_hidden()) { // Replace the last '+' with a '.'.
3074 for (int index = (int)src_length; index > 0; index--) {
3075 if (dest[index] == '+') {
3076 dest[index] = JVM_SIGNATURE_DOT;
3077 break;
3078 }
3079 }
3080 }
3081
3082 // Add the semicolon and the null
3083 dest[dest_index++] = JVM_SIGNATURE_ENDCLASS;
3084 dest[dest_index] = '\0';
3085 return dest;
3086 }
3087
3088 ModuleEntry* InstanceKlass::module() const {
3089 if (is_hidden() &&
3090 in_unnamed_package() &&
3091 class_loader_data()->has_class_mirror_holder()) {
3092 // For a non-strong hidden class defined to an unnamed package,
3093 // its (class held) CLD will not have an unnamed module created for it.
3094 // Two choices to find the correct ModuleEntry:
3095 // 1. If hidden class is within a nest, use nest host's module
3096 // 2. Find the unnamed module off from the class loader
3097 // For now option #2 is used since a nest host is not set until
3098 // after the instance class is created in jvm_lookup_define_class().
3099 if (class_loader_data()->is_boot_class_loader_data()) {
3100 return ClassLoaderData::the_null_class_loader_data()->unnamed_module();
3101 } else {
3102 oop module = java_lang_ClassLoader::unnamedModule(class_loader_data()->class_loader());
3103 assert(java_lang_Module::is_instance(module), "Not an instance of java.lang.Module");
3104 return java_lang_Module::module_entry(module);
3105 }
3106 }
3107
3108 // Class is in a named package
3109 if (!in_unnamed_package()) {
3110 return _package_entry->module();
3111 }
3112
3113 // Class is in an unnamed package, return its loader's unnamed module
3114 return class_loader_data()->unnamed_module();
3115 }
3116
3117 void InstanceKlass::set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS) {
3118
3119 // ensure java/ packages only loaded by boot or platform builtin loaders
3120 // not needed for shared class since CDS does not archive prohibited classes.
3121 if (!is_shared()) {
3122 check_prohibited_package(name(), loader_data, CHECK);
3123 }
3124
3125 if (is_shared() && _package_entry != nullptr) {
3126 if (CDSConfig::is_using_full_module_graph() && _package_entry == pkg_entry) {
3127 // we can use the saved package
3128 assert(MetaspaceShared::is_in_shared_metaspace(_package_entry), "must be");
3129 return;
3130 } else {
3131 _package_entry = nullptr;
3132 }
3133 }
3134
3135 // ClassLoader::package_from_class_name has already incremented the refcount of the symbol
3136 // it returns, so we need to decrement it when the current function exits.
3137 TempNewSymbol from_class_name =
3138 (pkg_entry != nullptr) ? nullptr : ClassLoader::package_from_class_name(name());
3139
3140 Symbol* pkg_name;
3141 if (pkg_entry != nullptr) {
3142 pkg_name = pkg_entry->name();
3143 } else {
3144 pkg_name = from_class_name;
3145 }
3146
3147 if (pkg_name != nullptr && loader_data != nullptr) {
3148
3149 // Find in class loader's package entry table.
3150 _package_entry = pkg_entry != nullptr ? pkg_entry : loader_data->packages()->lookup_only(pkg_name);
3151
3152 // If the package name is not found in the loader's package
3153 // entry table, it is an indication that the package has not
3154 // been defined. Consider it defined within the unnamed module.
3155 if (_package_entry == nullptr) {
3156
3157 if (!ModuleEntryTable::javabase_defined()) {
3158 // Before java.base is defined during bootstrapping, define all packages in
3159 // the java.base module. If a non-java.base package is erroneously placed
3160 // in the java.base module it will be caught later when java.base
3161 // is defined by ModuleEntryTable::verify_javabase_packages check.
3162 assert(ModuleEntryTable::javabase_moduleEntry() != nullptr, JAVA_BASE_NAME " module is null");
3163 _package_entry = loader_data->packages()->create_entry_if_absent(pkg_name, ModuleEntryTable::javabase_moduleEntry());
3164 } else {
3165 assert(loader_data->unnamed_module() != nullptr, "unnamed module is null");
3166 _package_entry = loader_data->packages()->create_entry_if_absent(pkg_name, loader_data->unnamed_module());
3167 }
3168
3169 // A package should have been successfully created
3170 DEBUG_ONLY(ResourceMark rm(THREAD));
3171 assert(_package_entry != nullptr, "Package entry for class %s not found, loader %s",
3172 name()->as_C_string(), loader_data->loader_name_and_id());
3173 }
3174
3175 if (log_is_enabled(Debug, module)) {
3176 ResourceMark rm(THREAD);
3177 ModuleEntry* m = _package_entry->module();
3178 log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s",
3179 external_name(),
3180 pkg_name->as_C_string(),
3181 loader_data->loader_name_and_id(),
3182 (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE));
3183 }
3184 } else {
3185 ResourceMark rm(THREAD);
3186 log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s",
3187 external_name(),
3188 (loader_data != nullptr) ? loader_data->loader_name_and_id() : "null",
3189 UNNAMED_MODULE);
3190 }
3191 }
3192
3193 // Function set_classpath_index ensures that for a non-null _package_entry
3194 // of the InstanceKlass, the entry is in the boot loader's package entry table.
3195 // It then sets the classpath_index in the package entry record.
3196 //
3197 // The classpath_index field is used to find the entry on the boot loader class
3198 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
3199 // in an unnamed module. It is also used to indicate (for all packages whose
3200 // classes are loaded by the boot loader) that at least one of the package's
3201 // classes has been loaded.
3202 void InstanceKlass::set_classpath_index(s2 path_index) {
3203 if (_package_entry != nullptr) {
3204 DEBUG_ONLY(PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();)
3205 assert(pkg_entry_tbl->lookup_only(_package_entry->name()) == _package_entry, "Should be same");
3206 assert(path_index != -1, "Unexpected classpath_index");
3207 _package_entry->set_classpath_index(path_index);
3208 }
3209 }
3210
3211 // different versions of is_same_class_package
3212
3213 bool InstanceKlass::is_same_class_package(const Klass* class2) const {
3214 oop classloader1 = this->class_loader();
3215 PackageEntry* classpkg1 = this->package();
3216 if (class2->is_objArray_klass()) {
3217 class2 = ObjArrayKlass::cast(class2)->bottom_klass();
3218 }
3219
3220 oop classloader2;
3221 PackageEntry* classpkg2;
3222 if (class2->is_instance_klass()) {
3223 classloader2 = class2->class_loader();
3224 classpkg2 = class2->package();
3225 } else {
3226 assert(class2->is_typeArray_klass(), "should be type array");
3227 classloader2 = nullptr;
3228 classpkg2 = nullptr;
3229 }
3230
3231 // Same package is determined by comparing class loader
3232 // and package entries. Both must be the same. This rule
3233 // applies even to classes that are defined in the unnamed
3234 // package, they still must have the same class loader.
3235 if ((classloader1 == classloader2) && (classpkg1 == classpkg2)) {
3236 return true;
3237 }
3238
3239 return false;
3240 }
3241
3242 // return true if this class and other_class are in the same package. Classloader
3243 // and classname information is enough to determine a class's package
3244 bool InstanceKlass::is_same_class_package(oop other_class_loader,
3245 const Symbol* other_class_name) const {
3246 if (class_loader() != other_class_loader) {
3247 return false;
3248 }
3249 if (name()->fast_compare(other_class_name) == 0) {
3250 return true;
3251 }
3252
3253 {
3254 ResourceMark rm;
3255
3256 bool bad_class_name = false;
3257 TempNewSymbol other_pkg = ClassLoader::package_from_class_name(other_class_name, &bad_class_name);
3258 if (bad_class_name) {
3259 return false;
3260 }
3261 // Check that package_from_class_name() returns null, not "", if there is no package.
3262 assert(other_pkg == nullptr || other_pkg->utf8_length() > 0, "package name is empty string");
3263
3264 const Symbol* const this_package_name =
3265 this->package() != nullptr ? this->package()->name() : nullptr;
3266
3267 if (this_package_name == nullptr || other_pkg == nullptr) {
3268 // One of the two doesn't have a package. Only return true if the other
3269 // one also doesn't have a package.
3270 return this_package_name == other_pkg;
3271 }
3272
3273 // Check if package is identical
3274 return this_package_name->fast_compare(other_pkg) == 0;
3275 }
3276 }
3277
3278 static bool is_prohibited_package_slow(Symbol* class_name) {
3279 // Caller has ResourceMark
3280 int length;
3281 jchar* unicode = class_name->as_unicode(length);
3282 return (length >= 5 &&
3283 unicode[0] == 'j' &&
3284 unicode[1] == 'a' &&
3285 unicode[2] == 'v' &&
3286 unicode[3] == 'a' &&
3287 unicode[4] == '/');
3288 }
3289
3290 // Only boot and platform class loaders can define classes in "java/" packages.
3291 void InstanceKlass::check_prohibited_package(Symbol* class_name,
3292 ClassLoaderData* loader_data,
3293 TRAPS) {
3294 if (!loader_data->is_boot_class_loader_data() &&
3295 !loader_data->is_platform_class_loader_data() &&
3296 class_name != nullptr && class_name->utf8_length() >= 5) {
3297 ResourceMark rm(THREAD);
3298 bool prohibited;
3299 const u1* base = class_name->base();
3300 if ((base[0] | base[1] | base[2] | base[3] | base[4]) & 0x80) {
3301 prohibited = is_prohibited_package_slow(class_name);
3302 } else {
3303 char* name = class_name->as_C_string();
3304 prohibited = (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/');
3305 }
3306 if (prohibited) {
3307 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name);
3308 assert(pkg_name != nullptr, "Error in parsing package name starting with 'java/'");
3309 char* name = pkg_name->as_C_string();
3310 const char* class_loader_name = loader_data->loader_name_and_id();
3311 StringUtils::replace_no_expand(name, "/", ".");
3312 const char* msg_text1 = "Class loader (instance of): ";
3313 const char* msg_text2 = " tried to load prohibited package name: ";
3314 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1;
3315 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
3316 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name);
3317 THROW_MSG(vmSymbols::java_lang_SecurityException(), message);
3318 }
3319 }
3320 return;
3321 }
3322
3323 bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const {
3324 constantPoolHandle i_cp(THREAD, constants());
3325 for (InnerClassesIterator iter(this); !iter.done(); iter.next()) {
3326 int ioff = iter.inner_class_info_index();
3327 if (ioff != 0) {
3328 // Check to see if the name matches the class we're looking for
3329 // before attempting to find the class.
3330 if (i_cp->klass_name_at_matches(this, ioff)) {
3331 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false);
3332 if (this == inner_klass) {
3333 *ooff = iter.outer_class_info_index();
3334 *noff = iter.inner_name_index();
3335 return true;
3336 }
3337 }
3338 }
3339 }
3340 return false;
3341 }
3342
3343 InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const {
3344 InstanceKlass* outer_klass = nullptr;
3345 *inner_is_member = false;
3346 int ooff = 0, noff = 0;
3347 bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD);
3348 if (has_inner_classes_attr) {
3349 constantPoolHandle i_cp(THREAD, constants());
3350 if (ooff != 0) {
3351 Klass* ok = i_cp->klass_at(ooff, CHECK_NULL);
3352 if (!ok->is_instance_klass()) {
3353 // If the outer class is not an instance klass then it cannot have
3354 // declared any inner classes.
3355 ResourceMark rm(THREAD);
3356 Exceptions::fthrow(
3357 THREAD_AND_LOCATION,
3358 vmSymbols::java_lang_IncompatibleClassChangeError(),
3359 "%s and %s disagree on InnerClasses attribute",
3360 ok->external_name(),
3361 external_name());
3362 return nullptr;
3363 }
3364 outer_klass = InstanceKlass::cast(ok);
3365 *inner_is_member = true;
3366 }
3367 if (nullptr == outer_klass) {
3368 // It may be a local class; try for that.
3369 int encl_method_class_idx = enclosing_method_class_index();
3370 if (encl_method_class_idx != 0) {
3371 Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
3372 outer_klass = InstanceKlass::cast(ok);
3373 *inner_is_member = false;
3374 }
3375 }
3376 }
3377
3378 // If no inner class attribute found for this class.
3379 if (nullptr == outer_klass) return nullptr;
3380
3381 // Throws an exception if outer klass has not declared k as an inner klass
3382 // We need evidence that each klass knows about the other, or else
3383 // the system could allow a spoof of an inner class to gain access rights.
3384 Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL);
3385 return outer_klass;
3386 }
3387
3388 jint InstanceKlass::compute_modifier_flags() const {
3389 jint access = access_flags().as_int();
3390
3391 // But check if it happens to be member class.
3392 InnerClassesIterator iter(this);
3393 for (; !iter.done(); iter.next()) {
3394 int ioff = iter.inner_class_info_index();
3395 // Inner class attribute can be zero, skip it.
3396 // Strange but true: JVM spec. allows null inner class refs.
3397 if (ioff == 0) continue;
3398
3399 // only look at classes that are already loaded
3400 // since we are looking for the flags for our self.
3401 Symbol* inner_name = constants()->klass_name_at(ioff);
3402 if (name() == inner_name) {
3403 // This is really a member class.
3404 access = iter.inner_access_flags();
3405 break;
3406 }
3407 }
3408 // Remember to strip ACC_SUPER bit
3409 return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS;
3410 }
3411
3412 jint InstanceKlass::jvmti_class_status() const {
3413 jint result = 0;
3414
3415 if (is_linked()) {
3416 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
3417 }
3418
3419 if (is_initialized()) {
3420 assert(is_linked(), "Class status is not consistent");
3421 result |= JVMTI_CLASS_STATUS_INITIALIZED;
3422 }
3423 if (is_in_error_state()) {
3424 result |= JVMTI_CLASS_STATUS_ERROR;
3425 }
3426 return result;
3427 }
3428
3429 Method* InstanceKlass::method_at_itable(InstanceKlass* holder, int index, TRAPS) {
3430 bool implements_interface; // initialized by method_at_itable_or_null
3431 Method* m = method_at_itable_or_null(holder, index,
3432 implements_interface); // out parameter
3433 if (m != nullptr) {
3434 assert(implements_interface, "sanity");
3435 return m;
3436 } else if (implements_interface) {
3437 // Throw AbstractMethodError since corresponding itable slot is empty.
3438 THROW_NULL(vmSymbols::java_lang_AbstractMethodError());
3439 } else {
3440 // If the interface isn't implemented by the receiver class,
3441 // the VM should throw IncompatibleClassChangeError.
3442 ResourceMark rm(THREAD);
3443 stringStream ss;
3444 bool same_module = (module() == holder->module());
3445 ss.print("Receiver class %s does not implement "
3446 "the interface %s defining the method to be called "
3447 "(%s%s%s)",
3448 external_name(), holder->external_name(),
3449 (same_module) ? joint_in_module_of_loader(holder) : class_in_module_of_loader(),
3450 (same_module) ? "" : "; ",
3451 (same_module) ? "" : holder->class_in_module_of_loader());
3452 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
3453 }
3454 }
3455
3456 Method* InstanceKlass::method_at_itable_or_null(InstanceKlass* holder, int index, bool& implements_interface) {
3457 klassItable itable(this);
3458 for (int i = 0; i < itable.size_offset_table(); i++) {
3459 itableOffsetEntry* offset_entry = itable.offset_entry(i);
3460 if (offset_entry->interface_klass() == holder) {
3461 implements_interface = true;
3462 itableMethodEntry* ime = offset_entry->first_method_entry(this);
3463 Method* m = ime[index].method();
3464 return m;
3465 }
3466 }
3467 implements_interface = false;
3468 return nullptr; // offset entry not found
3469 }
3470
3471 int InstanceKlass::vtable_index_of_interface_method(Method* intf_method) {
3472 assert(is_linked(), "required");
3473 assert(intf_method->method_holder()->is_interface(), "not an interface method");
3474 assert(is_subtype_of(intf_method->method_holder()), "interface not implemented");
3475
3476 int vtable_index = Method::invalid_vtable_index;
3477 Symbol* name = intf_method->name();
3478 Symbol* signature = intf_method->signature();
3479
3480 // First check in default method array
3481 if (!intf_method->is_abstract() && default_methods() != nullptr) {
3482 int index = find_method_index(default_methods(),
3483 name, signature,
3484 Klass::OverpassLookupMode::find,
3485 Klass::StaticLookupMode::find,
3486 Klass::PrivateLookupMode::find);
3487 if (index >= 0) {
3488 vtable_index = default_vtable_indices()->at(index);
3489 }
3490 }
3491 if (vtable_index == Method::invalid_vtable_index) {
3492 // get vtable_index for miranda methods
3493 klassVtable vt = vtable();
3494 vtable_index = vt.index_of_miranda(name, signature);
3495 }
3496 return vtable_index;
3497 }
3498
3499 #if INCLUDE_JVMTI
3500 // update default_methods for redefineclasses for methods that are
3501 // not yet in the vtable due to concurrent subclass define and superinterface
3502 // redefinition
3503 // Note: those in the vtable, should have been updated via adjust_method_entries
3504 void InstanceKlass::adjust_default_methods(bool* trace_name_printed) {
3505 // search the default_methods for uses of either obsolete or EMCP methods
3506 if (default_methods() != nullptr) {
3507 for (int index = 0; index < default_methods()->length(); index ++) {
3508 Method* old_method = default_methods()->at(index);
3509 if (old_method == nullptr || !old_method->is_old()) {
3510 continue; // skip uninteresting entries
3511 }
3512 assert(!old_method->is_deleted(), "default methods may not be deleted");
3513 Method* new_method = old_method->get_new_method();
3514 default_methods()->at_put(index, new_method);
3515
3516 if (log_is_enabled(Info, redefine, class, update)) {
3517 ResourceMark rm;
3518 if (!(*trace_name_printed)) {
3519 log_info(redefine, class, update)
3520 ("adjust: klassname=%s default methods from name=%s",
3521 external_name(), old_method->method_holder()->external_name());
3522 *trace_name_printed = true;
3523 }
3524 log_debug(redefine, class, update, vtables)
3525 ("default method update: %s(%s) ",
3526 new_method->name()->as_C_string(), new_method->signature()->as_C_string());
3527 }
3528 }
3529 }
3530 }
3531 #endif // INCLUDE_JVMTI
3532
3533 // On-stack replacement stuff
3534 void InstanceKlass::add_osr_nmethod(nmethod* n) {
3535 assert_lock_strong(NMethodState_lock);
3536 #ifndef PRODUCT
3537 nmethod* prev = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), n->comp_level(), true);
3538 assert(prev == nullptr || !prev->is_in_use() COMPILER2_PRESENT(|| StressRecompilation),
3539 "redundant OSR recompilation detected. memory leak in CodeCache!");
3540 #endif
3541 // only one compilation can be active
3542 assert(n->is_osr_method(), "wrong kind of nmethod");
3543 n->set_osr_link(osr_nmethods_head());
3544 set_osr_nmethods_head(n);
3545 // Raise the highest osr level if necessary
3546 n->method()->set_highest_osr_comp_level(MAX2(n->method()->highest_osr_comp_level(), n->comp_level()));
3547
3548 // Get rid of the osr methods for the same bci that have lower levels.
3549 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) {
3550 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true);
3551 if (inv != nullptr && inv->is_in_use()) {
3552 inv->make_not_entrant();
3553 }
3554 }
3555 }
3556
3557 // Remove osr nmethod from the list. Return true if found and removed.
3558 bool InstanceKlass::remove_osr_nmethod(nmethod* n) {
3559 // This is a short non-blocking critical region, so the no safepoint check is ok.
3560 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
3561 assert(n->is_osr_method(), "wrong kind of nmethod");
3562 nmethod* last = nullptr;
3563 nmethod* cur = osr_nmethods_head();
3564 int max_level = CompLevel_none; // Find the max comp level excluding n
3565 Method* m = n->method();
3566 // Search for match
3567 bool found = false;
3568 while(cur != nullptr && cur != n) {
3569 if (m == cur->method()) {
3570 // Find max level before n
3571 max_level = MAX2(max_level, cur->comp_level());
3572 }
3573 last = cur;
3574 cur = cur->osr_link();
3575 }
3576 nmethod* next = nullptr;
3577 if (cur == n) {
3578 found = true;
3579 next = cur->osr_link();
3580 if (last == nullptr) {
3581 // Remove first element
3582 set_osr_nmethods_head(next);
3583 } else {
3584 last->set_osr_link(next);
3585 }
3586 }
3587 n->set_osr_link(nullptr);
3588 cur = next;
3589 while (cur != nullptr) {
3590 // Find max level after n
3591 if (m == cur->method()) {
3592 max_level = MAX2(max_level, cur->comp_level());
3593 }
3594 cur = cur->osr_link();
3595 }
3596 m->set_highest_osr_comp_level(max_level);
3597 return found;
3598 }
3599
3600 int InstanceKlass::mark_osr_nmethods(DeoptimizationScope* deopt_scope, const Method* m) {
3601 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
3602 nmethod* osr = osr_nmethods_head();
3603 int found = 0;
3604 while (osr != nullptr) {
3605 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3606 if (osr->method() == m) {
3607 deopt_scope->mark(osr);
3608 found++;
3609 }
3610 osr = osr->osr_link();
3611 }
3612 return found;
3613 }
3614
3615 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
3616 ConditionalMutexLocker ml(NMethodState_lock, !NMethodState_lock->owned_by_self(), Mutex::_no_safepoint_check_flag);
3617 nmethod* osr = osr_nmethods_head();
3618 nmethod* best = nullptr;
3619 while (osr != nullptr) {
3620 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3621 // There can be a time when a c1 osr method exists but we are waiting
3622 // for a c2 version. When c2 completes its osr nmethod we will trash
3623 // the c1 version and only be able to find the c2 version. However
3624 // while we overflow in the c1 code at back branches we don't want to
3625 // try and switch to the same code as we are already running
3626
3627 if (osr->method() == m &&
3628 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
3629 if (match_level) {
3630 if (osr->comp_level() == comp_level) {
3631 // Found a match - return it.
3632 return osr;
3633 }
3634 } else {
3635 if (best == nullptr || (osr->comp_level() > best->comp_level())) {
3636 if (osr->comp_level() == CompilationPolicy::highest_compile_level()) {
3637 // Found the best possible - return it.
3638 return osr;
3639 }
3640 best = osr;
3641 }
3642 }
3643 }
3644 osr = osr->osr_link();
3645 }
3646
3647 assert(match_level == false || best == nullptr, "shouldn't pick up anything if match_level is set");
3648 if (best != nullptr && best->comp_level() >= comp_level) {
3649 return best;
3650 }
3651 return nullptr;
3652 }
3653
3654 // -----------------------------------------------------------------------------------------------------
3655 // Printing
3656
3657 #define BULLET " - "
3658
3659 static const char* state_names[] = {
3660 "allocated", "loaded", "being_linked", "linked", "being_initialized", "fully_initialized", "initialization_error"
3661 };
3662
3663 static void print_vtable(intptr_t* start, int len, outputStream* st) {
3664 for (int i = 0; i < len; i++) {
3665 intptr_t e = start[i];
3666 st->print("%d : " INTPTR_FORMAT, i, e);
3667 if (MetaspaceObj::is_valid((Metadata*)e)) {
3668 st->print(" ");
3669 ((Metadata*)e)->print_value_on(st);
3670 }
3671 st->cr();
3672 }
3673 }
3674
3675 static void print_vtable(vtableEntry* start, int len, outputStream* st) {
3676 return print_vtable(reinterpret_cast<intptr_t*>(start), len, st);
3677 }
3678
3679 const char* InstanceKlass::init_state_name() const {
3680 return state_names[init_state()];
3681 }
3682
3683 const char* InstanceKlass::state2name(ClassState s) {
3684 return state_names[s];
3685 }
3686
3687 void InstanceKlass::print_on(outputStream* st) const {
3688 assert(is_klass(), "must be klass");
3689 Klass::print_on(st);
3690
3691 st->print(BULLET"instance size: %d", size_helper()); st->cr();
3692 st->print(BULLET"klass size: %d", size()); st->cr();
3693 st->print(BULLET"access: "); access_flags().print_on(st); st->cr();
3694 st->print(BULLET"flags: "); _misc_flags.print_on(st); st->cr();
3695 st->print(BULLET"state: "); st->print_cr("%s", init_state_name());
3696 st->print(BULLET"name: "); name()->print_value_on(st); st->cr();
3697 st->print(BULLET"super: "); Metadata::print_value_on_maybe_null(st, super()); st->cr();
3698 st->print(BULLET"sub: ");
3699 Klass* sub = subklass();
3700 int n;
3701 for (n = 0; sub != nullptr; n++, sub = sub->next_sibling()) {
3702 if (n < MaxSubklassPrintSize) {
3703 sub->print_value_on(st);
3704 st->print(" ");
3705 }
3706 }
3707 if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize);
3708 st->cr();
3709
3710 if (is_interface()) {
3711 st->print_cr(BULLET"nof implementors: %d", nof_implementors());
3712 if (nof_implementors() == 1) {
3713 st->print_cr(BULLET"implementor: ");
3714 st->print(" ");
3715 implementor()->print_value_on(st);
3716 st->cr();
3717 }
3718 }
3719
3720 st->print(BULLET"arrays: "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr();
3721 st->print(BULLET"methods: "); methods()->print_value_on(st); st->cr();
3722 if (Verbose || WizardMode) {
3723 Array<Method*>* method_array = methods();
3724 for (int i = 0; i < method_array->length(); i++) {
3725 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3726 }
3727 }
3728 st->print(BULLET"method ordering: "); method_ordering()->print_value_on(st); st->cr();
3729 st->print(BULLET"default_methods: "); default_methods()->print_value_on(st); st->cr();
3730 if (Verbose && default_methods() != nullptr) {
3731 Array<Method*>* method_array = default_methods();
3732 for (int i = 0; i < method_array->length(); i++) {
3733 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3734 }
3735 }
3736 if (default_vtable_indices() != nullptr) {
3737 st->print(BULLET"default vtable indices: "); default_vtable_indices()->print_value_on(st); st->cr();
3738 }
3739 st->print(BULLET"local interfaces: "); local_interfaces()->print_value_on(st); st->cr();
3740 st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr();
3741
3742 st->print(BULLET"secondary supers: "); secondary_supers()->print_value_on(st); st->cr();
3743 if (UseSecondarySupersTable) {
3744 st->print(BULLET"hash_slot: %d", hash_slot()); st->cr();
3745 st->print(BULLET"bitmap: " UINTX_FORMAT_X_0, _bitmap); st->cr();
3746 }
3747 if (secondary_supers() != nullptr) {
3748 if (Verbose) {
3749 bool is_hashed = UseSecondarySupersTable && (_bitmap != SECONDARY_SUPERS_BITMAP_FULL);
3750 st->print_cr(BULLET"---- secondary supers (%d words):", _secondary_supers->length());
3751 for (int i = 0; i < _secondary_supers->length(); i++) {
3752 ResourceMark rm; // for external_name()
3753 Klass* secondary_super = _secondary_supers->at(i);
3754 st->print(BULLET"%2d:", i);
3755 if (is_hashed) {
3756 int home_slot = compute_home_slot(secondary_super, _bitmap);
3757 int distance = (i - home_slot) & SECONDARY_SUPERS_TABLE_MASK;
3758 st->print(" dist:%02d:", distance);
3759 }
3760 st->print_cr(" %p %s", secondary_super, secondary_super->external_name());
3761 }
3762 }
3763 }
3764 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr();
3765 if (class_loader_data() != nullptr) {
3766 st->print(BULLET"class loader data: ");
3767 class_loader_data()->print_value_on(st);
3768 st->cr();
3769 }
3770 if (source_file_name() != nullptr) {
3771 st->print(BULLET"source file: ");
3772 source_file_name()->print_value_on(st);
3773 st->cr();
3774 }
3775 if (source_debug_extension() != nullptr) {
3776 st->print(BULLET"source debug extension: ");
3777 st->print("%s", source_debug_extension());
3778 st->cr();
3779 }
3780 st->print(BULLET"class annotations: "); class_annotations()->print_value_on(st); st->cr();
3781 st->print(BULLET"class type annotations: "); class_type_annotations()->print_value_on(st); st->cr();
3782 st->print(BULLET"field annotations: "); fields_annotations()->print_value_on(st); st->cr();
3783 st->print(BULLET"field type annotations: "); fields_type_annotations()->print_value_on(st); st->cr();
3784 {
3785 bool have_pv = false;
3786 // previous versions are linked together through the InstanceKlass
3787 for (InstanceKlass* pv_node = previous_versions();
3788 pv_node != nullptr;
3789 pv_node = pv_node->previous_versions()) {
3790 if (!have_pv)
3791 st->print(BULLET"previous version: ");
3792 have_pv = true;
3793 pv_node->constants()->print_value_on(st);
3794 }
3795 if (have_pv) st->cr();
3796 }
3797
3798 if (generic_signature() != nullptr) {
3799 st->print(BULLET"generic signature: ");
3800 generic_signature()->print_value_on(st);
3801 st->cr();
3802 }
3803 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr();
3804 st->print(BULLET"nest members: "); nest_members()->print_value_on(st); st->cr();
3805 if (record_components() != nullptr) {
3806 st->print(BULLET"record components: "); record_components()->print_value_on(st); st->cr();
3807 }
3808 st->print(BULLET"permitted subclasses: "); permitted_subclasses()->print_value_on(st); st->cr();
3809 if (java_mirror() != nullptr) {
3810 st->print(BULLET"java mirror: ");
3811 java_mirror()->print_value_on(st);
3812 st->cr();
3813 } else {
3814 st->print_cr(BULLET"java mirror: null");
3815 }
3816 st->print(BULLET"vtable length %d (start addr: " PTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
3817 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st);
3818 st->print(BULLET"itable length %d (start addr: " PTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
3819 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_itable(), itable_length(), st);
3820 st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
3821
3822 FieldPrinter print_static_field(st);
3823 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
3824 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
3825 FieldPrinter print_nonstatic_field(st);
3826 InstanceKlass* ik = const_cast<InstanceKlass*>(this);
3827 ik->print_nonstatic_fields(&print_nonstatic_field);
3828
3829 st->print(BULLET"non-static oop maps: ");
3830 OopMapBlock* map = start_of_nonstatic_oop_maps();
3831 OopMapBlock* end_map = map + nonstatic_oop_map_count();
3832 while (map < end_map) {
3833 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
3834 map++;
3835 }
3836 st->cr();
3837 }
3838
3839 void InstanceKlass::print_value_on(outputStream* st) const {
3840 assert(is_klass(), "must be klass");
3841 if (Verbose || WizardMode) access_flags().print_on(st);
3842 name()->print_value_on(st);
3843 }
3844
3845 void FieldPrinter::do_field(fieldDescriptor* fd) {
3846 _st->print(BULLET);
3847 if (_obj == nullptr) {
3848 fd->print_on(_st);
3849 _st->cr();
3850 } else {
3851 fd->print_on_for(_st, _obj);
3852 _st->cr();
3853 }
3854 }
3855
3856
3857 void InstanceKlass::oop_print_on(oop obj, outputStream* st) {
3858 Klass::oop_print_on(obj, st);
3859
3860 if (this == vmClasses::String_klass()) {
3861 typeArrayOop value = java_lang_String::value(obj);
3862 juint length = java_lang_String::length(obj);
3863 if (value != nullptr &&
3864 value->is_typeArray() &&
3865 length <= (juint) value->length()) {
3866 st->print(BULLET"string: ");
3867 java_lang_String::print(obj, st);
3868 st->cr();
3869 }
3870 }
3871
3872 st->print_cr(BULLET"---- fields (total size " SIZE_FORMAT " words):", oop_size(obj));
3873 FieldPrinter print_field(st, obj);
3874 print_nonstatic_fields(&print_field);
3875
3876 if (this == vmClasses::Class_klass()) {
3877 st->print(BULLET"signature: ");
3878 java_lang_Class::print_signature(obj, st);
3879 st->cr();
3880 Klass* real_klass = java_lang_Class::as_Klass(obj);
3881 if (real_klass != nullptr && real_klass->is_instance_klass()) {
3882 st->print_cr(BULLET"---- static fields (%d):", java_lang_Class::static_oop_field_count(obj));
3883 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
3884 }
3885 } else if (this == vmClasses::MethodType_klass()) {
3886 st->print(BULLET"signature: ");
3887 java_lang_invoke_MethodType::print_signature(obj, st);
3888 st->cr();
3889 }
3890 }
3891
3892 #ifndef PRODUCT
3893
3894 bool InstanceKlass::verify_itable_index(int i) {
3895 int method_count = klassItable::method_count_for_interface(this);
3896 assert(i >= 0 && i < method_count, "index out of bounds");
3897 return true;
3898 }
3899
3900 #endif //PRODUCT
3901
3902 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
3903 st->print("a ");
3904 name()->print_value_on(st);
3905 obj->print_address_on(st);
3906 if (this == vmClasses::String_klass()
3907 && java_lang_String::value(obj) != nullptr) {
3908 ResourceMark rm;
3909 int len = java_lang_String::length(obj);
3910 int plen = (len < 24 ? len : 12);
3911 char* str = java_lang_String::as_utf8_string(obj, 0, plen);
3912 st->print(" = \"%s\"", str);
3913 if (len > plen)
3914 st->print("...[%d]", len);
3915 } else if (this == vmClasses::Class_klass()) {
3916 Klass* k = java_lang_Class::as_Klass(obj);
3917 st->print(" = ");
3918 if (k != nullptr) {
3919 k->print_value_on(st);
3920 } else {
3921 const char* tname = type2name(java_lang_Class::primitive_type(obj));
3922 st->print("%s", tname ? tname : "type?");
3923 }
3924 } else if (this == vmClasses::MethodType_klass()) {
3925 st->print(" = ");
3926 java_lang_invoke_MethodType::print_signature(obj, st);
3927 } else if (java_lang_boxing_object::is_instance(obj)) {
3928 st->print(" = ");
3929 java_lang_boxing_object::print(obj, st);
3930 } else if (this == vmClasses::LambdaForm_klass()) {
3931 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
3932 if (vmentry != nullptr) {
3933 st->print(" => ");
3934 vmentry->print_value_on(st);
3935 }
3936 } else if (this == vmClasses::MemberName_klass()) {
3937 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
3938 if (vmtarget != nullptr) {
3939 st->print(" = ");
3940 vmtarget->print_value_on(st);
3941 } else {
3942 oop clazz = java_lang_invoke_MemberName::clazz(obj);
3943 oop name = java_lang_invoke_MemberName::name(obj);
3944 if (clazz != nullptr) {
3945 clazz->print_value_on(st);
3946 } else {
3947 st->print("null");
3948 }
3949 st->print(".");
3950 if (name != nullptr) {
3951 name->print_value_on(st);
3952 } else {
3953 st->print("null");
3954 }
3955 }
3956 }
3957 }
3958
3959 const char* InstanceKlass::internal_name() const {
3960 return external_name();
3961 }
3962
3963 void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data,
3964 const ModuleEntry* module_entry,
3965 const ClassFileStream* cfs) const {
3966
3967 if (ClassListWriter::is_enabled()) {
3968 ClassListWriter::write(this, cfs);
3969 }
3970
3971 print_class_load_helper(loader_data, module_entry, cfs);
3972 print_class_load_cause_logging();
3973 }
3974
3975 void InstanceKlass::print_class_load_helper(ClassLoaderData* loader_data,
3976 const ModuleEntry* module_entry,
3977 const ClassFileStream* cfs) const {
3978
3979 if (!log_is_enabled(Info, class, load)) {
3980 return;
3981 }
3982
3983 ResourceMark rm;
3984 LogMessage(class, load) msg;
3985 stringStream info_stream;
3986
3987 // Name and class hierarchy info
3988 info_stream.print("%s", external_name());
3989
3990 // Source
3991 if (cfs != nullptr) {
3992 if (cfs->source() != nullptr) {
3993 const char* module_name = (module_entry->name() == nullptr) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
3994 if (module_name != nullptr) {
3995 // When the boot loader created the stream, it didn't know the module name
3996 // yet. Let's format it now.
3997 if (cfs->from_boot_loader_modules_image()) {
3998 info_stream.print(" source: jrt:/%s", module_name);
3999 } else {
4000 info_stream.print(" source: %s", cfs->source());
4001 }
4002 } else {
4003 info_stream.print(" source: %s", cfs->source());
4004 }
4005 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) {
4006 Thread* current = Thread::current();
4007 Klass* caller = current->is_Java_thread() ?
4008 JavaThread::cast(current)->security_get_caller_class(1):
4009 nullptr;
4010 // caller can be null, for example, during a JVMTI VM_Init hook
4011 if (caller != nullptr) {
4012 info_stream.print(" source: instance of %s", caller->external_name());
4013 } else {
4014 // source is unknown
4015 }
4016 } else {
4017 oop class_loader = loader_data->class_loader();
4018 info_stream.print(" source: %s", class_loader->klass()->external_name());
4019 }
4020 } else {
4021 assert(this->is_shared(), "must be");
4022 if (MetaspaceShared::is_shared_dynamic((void*)this)) {
4023 info_stream.print(" source: shared objects file (top)");
4024 } else {
4025 info_stream.print(" source: shared objects file");
4026 }
4027 }
4028
4029 info_stream.print(" loader:");
4030 if (is_shared()) {
4031 info_stream.print(" %s", SystemDictionaryShared::class_loader_name_for_shared((Klass*)this));
4032 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) {
4033 info_stream.print(" boot_loader");
4034 } else {
4035 oop class_loader = loader_data->class_loader();
4036 if (class_loader != nullptr) {
4037 info_stream.print(" %s", class_loader->klass()->external_name());
4038 oop cl_name_and_id = java_lang_ClassLoader::nameAndId(class_loader);
4039 if (cl_name_and_id != nullptr) {
4040 info_stream.print(" %s", java_lang_String::as_utf8_string(cl_name_and_id));
4041 }
4042 } else {
4043 info_stream.print(" null");
4044 }
4045 }
4046 msg.info("%s", info_stream.as_string());
4047
4048 if (log_is_enabled(Debug, class, load)) {
4049 stringStream debug_stream;
4050
4051 // Class hierarchy info
4052 debug_stream.print(" klass: " PTR_FORMAT " super: " PTR_FORMAT,
4053 p2i(this), p2i(superklass()));
4054
4055 // Interfaces
4056 if (local_interfaces() != nullptr && local_interfaces()->length() > 0) {
4057 debug_stream.print(" interfaces:");
4058 int length = local_interfaces()->length();
4059 for (int i = 0; i < length; i++) {
4060 debug_stream.print(" " PTR_FORMAT,
4061 p2i(InstanceKlass::cast(local_interfaces()->at(i))));
4062 }
4063 }
4064
4065 // Class loader
4066 debug_stream.print(" loader: [");
4067 loader_data->print_value_on(&debug_stream);
4068 debug_stream.print("]");
4069
4070 // Classfile checksum
4071 if (cfs) {
4072 debug_stream.print(" bytes: %d checksum: %08x",
4073 cfs->length(),
4074 ClassLoader::crc32(0, (const char*)cfs->buffer(),
4075 cfs->length()));
4076 }
4077
4078 msg.debug("%s", debug_stream.as_string());
4079 }
4080 }
4081
4082 void InstanceKlass::print_class_load_cause_logging() const {
4083 bool log_cause_native = log_is_enabled(Info, class, load, cause, native);
4084 if (log_cause_native || log_is_enabled(Info, class, load, cause)) {
4085 JavaThread* current = JavaThread::current();
4086 ResourceMark rm(current);
4087 const char* name = external_name();
4088
4089 if (LogClassLoadingCauseFor == nullptr ||
4090 (strcmp("*", LogClassLoadingCauseFor) != 0 &&
4091 strstr(name, LogClassLoadingCauseFor) == nullptr)) {
4092 return;
4093 }
4094
4095 // Log Java stack first
4096 {
4097 LogMessage(class, load, cause) msg;
4098 NonInterleavingLogStream info_stream{LogLevelType::Info, msg};
4099
4100 info_stream.print_cr("Java stack when loading %s:", name);
4101 current->print_stack_on(&info_stream);
4102 }
4103
4104 // Log native stack second
4105 if (log_cause_native) {
4106 // Log to string first so that lines can be indented
4107 stringStream stack_stream;
4108 char buf[O_BUFLEN];
4109 address lastpc = nullptr;
4110 if (os::platform_print_native_stack(&stack_stream, nullptr, buf, O_BUFLEN, lastpc)) {
4111 // We have printed the native stack in platform-specific code,
4112 // so nothing else to do in this case.
4113 } else {
4114 frame f = os::current_frame();
4115 VMError::print_native_stack(&stack_stream, f, current, true /*print_source_info */,
4116 -1 /* max stack_stream */, buf, O_BUFLEN);
4117 }
4118
4119 LogMessage(class, load, cause, native) msg;
4120 NonInterleavingLogStream info_stream{LogLevelType::Info, msg};
4121 info_stream.print_cr("Native stack when loading %s:", name);
4122
4123 // Print each native stack line to the log
4124 int size = (int) stack_stream.size();
4125 char* stack = stack_stream.as_string();
4126 char* stack_end = stack + size;
4127 char* line_start = stack;
4128 for (char* p = stack; p < stack_end; p++) {
4129 if (*p == '\n') {
4130 *p = '\0';
4131 info_stream.print_cr("\t%s", line_start);
4132 line_start = p + 1;
4133 }
4134 }
4135 if (line_start < stack_end) {
4136 info_stream.print_cr("\t%s", line_start);
4137 }
4138 }
4139 }
4140 }
4141
4142 // Verification
4143
4144 class VerifyFieldClosure: public BasicOopIterateClosure {
4145 protected:
4146 template <class T> void do_oop_work(T* p) {
4147 oop obj = RawAccess<>::oop_load(p);
4148 if (!oopDesc::is_oop_or_null(obj)) {
4149 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj));
4150 Universe::print_on(tty);
4151 guarantee(false, "boom");
4152 }
4153 }
4154 public:
4155 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); }
4156 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
4157 };
4158
4159 void InstanceKlass::verify_on(outputStream* st) {
4160 #ifndef PRODUCT
4161 // Avoid redundant verifies, this really should be in product.
4162 if (_verify_count == Universe::verify_count()) return;
4163 _verify_count = Universe::verify_count();
4164 #endif
4165
4166 // Verify Klass
4167 Klass::verify_on(st);
4168
4169 // Verify that klass is present in ClassLoaderData
4170 guarantee(class_loader_data()->contains_klass(this),
4171 "this class isn't found in class loader data");
4172
4173 // Verify vtables
4174 if (is_linked()) {
4175 // $$$ This used to be done only for m/s collections. Doing it
4176 // always seemed a valid generalization. (DLD -- 6/00)
4177 vtable().verify(st);
4178 }
4179
4180 // Verify first subklass
4181 if (subklass() != nullptr) {
4182 guarantee(subklass()->is_klass(), "should be klass");
4183 }
4184
4185 // Verify siblings
4186 Klass* super = this->super();
4187 Klass* sib = next_sibling();
4188 if (sib != nullptr) {
4189 if (sib == this) {
4190 fatal("subclass points to itself " PTR_FORMAT, p2i(sib));
4191 }
4192
4193 guarantee(sib->is_klass(), "should be klass");
4194 guarantee(sib->super() == super, "siblings should have same superklass");
4195 }
4196
4197 // Verify local interfaces
4198 if (local_interfaces()) {
4199 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
4200 for (int j = 0; j < local_interfaces->length(); j++) {
4201 InstanceKlass* e = local_interfaces->at(j);
4202 guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
4203 }
4204 }
4205
4206 // Verify transitive interfaces
4207 if (transitive_interfaces() != nullptr) {
4208 Array<InstanceKlass*>* transitive_interfaces = this->transitive_interfaces();
4209 for (int j = 0; j < transitive_interfaces->length(); j++) {
4210 InstanceKlass* e = transitive_interfaces->at(j);
4211 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
4212 }
4213 }
4214
4215 // Verify methods
4216 if (methods() != nullptr) {
4217 Array<Method*>* methods = this->methods();
4218 for (int j = 0; j < methods->length(); j++) {
4219 guarantee(methods->at(j)->is_method(), "non-method in methods array");
4220 }
4221 for (int j = 0; j < methods->length() - 1; j++) {
4222 Method* m1 = methods->at(j);
4223 Method* m2 = methods->at(j + 1);
4224 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
4225 }
4226 }
4227
4228 // Verify method ordering
4229 if (method_ordering() != nullptr) {
4230 Array<int>* method_ordering = this->method_ordering();
4231 int length = method_ordering->length();
4232 if (JvmtiExport::can_maintain_original_method_order() ||
4233 ((UseSharedSpaces || CDSConfig::is_dumping_archive()) && length != 0)) {
4234 guarantee(length == methods()->length(), "invalid method ordering length");
4235 jlong sum = 0;
4236 for (int j = 0; j < length; j++) {
4237 int original_index = method_ordering->at(j);
4238 guarantee(original_index >= 0, "invalid method ordering index");
4239 guarantee(original_index < length, "invalid method ordering index");
4240 sum += original_index;
4241 }
4242 // Verify sum of indices 0,1,...,length-1
4243 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
4244 } else {
4245 guarantee(length == 0, "invalid method ordering length");
4246 }
4247 }
4248
4249 // Verify default methods
4250 if (default_methods() != nullptr) {
4251 Array<Method*>* methods = this->default_methods();
4252 for (int j = 0; j < methods->length(); j++) {
4253 guarantee(methods->at(j)->is_method(), "non-method in methods array");
4254 }
4255 for (int j = 0; j < methods->length() - 1; j++) {
4256 Method* m1 = methods->at(j);
4257 Method* m2 = methods->at(j + 1);
4258 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
4259 }
4260 }
4261
4262 // Verify JNI static field identifiers
4263 if (jni_ids() != nullptr) {
4264 jni_ids()->verify(this);
4265 }
4266
4267 // Verify other fields
4268 if (constants() != nullptr) {
4269 guarantee(constants()->is_constantPool(), "should be constant pool");
4270 }
4271 }
4272
4273 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
4274 Klass::oop_verify_on(obj, st);
4275 VerifyFieldClosure blk;
4276 obj->oop_iterate(&blk);
4277 }
4278
4279
4280 // JNIid class for jfieldIDs only
4281 // Note to reviewers:
4282 // These JNI functions are just moved over to column 1 and not changed
4283 // in the compressed oops workspace.
4284 JNIid::JNIid(Klass* holder, int offset, JNIid* next) {
4285 _holder = holder;
4286 _offset = offset;
4287 _next = next;
4288 debug_only(_is_static_field_id = false;)
4289 }
4290
4291
4292 JNIid* JNIid::find(int offset) {
4293 JNIid* current = this;
4294 while (current != nullptr) {
4295 if (current->offset() == offset) return current;
4296 current = current->next();
4297 }
4298 return nullptr;
4299 }
4300
4301 void JNIid::deallocate(JNIid* current) {
4302 while (current != nullptr) {
4303 JNIid* next = current->next();
4304 delete current;
4305 current = next;
4306 }
4307 }
4308
4309
4310 void JNIid::verify(Klass* holder) {
4311 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields();
4312 int end_field_offset;
4313 end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize);
4314
4315 JNIid* current = this;
4316 while (current != nullptr) {
4317 guarantee(current->holder() == holder, "Invalid klass in JNIid");
4318 #ifdef ASSERT
4319 int o = current->offset();
4320 if (current->is_static_field_id()) {
4321 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid");
4322 }
4323 #endif
4324 current = current->next();
4325 }
4326 }
4327
4328 void InstanceKlass::set_init_state(ClassState state) {
4329 if (state > loaded) {
4330 assert_lock_strong(_init_monitor);
4331 }
4332 #ifdef ASSERT
4333 bool good_state = is_shared() ? (_init_state <= state)
4334 : (_init_state < state);
4335 bool link_failed = _init_state == being_linked && state == loaded;
4336 assert(good_state || state == allocated || link_failed, "illegal state transition");
4337 #endif
4338 assert(_init_thread == nullptr, "should be cleared before state change");
4339 Atomic::store(&_init_state, state);
4340 }
4341
4342 #if INCLUDE_JVMTI
4343
4344 // RedefineClasses() support for previous versions
4345
4346 // Globally, there is at least one previous version of a class to walk
4347 // during class unloading, which is saved because old methods in the class
4348 // are still running. Otherwise the previous version list is cleaned up.
4349 bool InstanceKlass::_should_clean_previous_versions = false;
4350
4351 // Returns true if there are previous versions of a class for class
4352 // unloading only. Also resets the flag to false. purge_previous_version
4353 // will set the flag to true if there are any left, i.e., if there's any
4354 // work to do for next time. This is to avoid the expensive code cache
4355 // walk in CLDG::clean_deallocate_lists().
4356 bool InstanceKlass::should_clean_previous_versions_and_reset() {
4357 bool ret = _should_clean_previous_versions;
4358 log_trace(redefine, class, iklass, purge)("Class unloading: should_clean_previous_versions = %s",
4359 ret ? "true" : "false");
4360 _should_clean_previous_versions = false;
4361 return ret;
4362 }
4363
4364 // This nulls out jmethodIDs for all methods in 'klass'
4365 // It needs to be called explicitly for all previous versions of a class because these may not be cleaned up
4366 // during class unloading.
4367 // We can not use the jmethodID cache associated with klass directly because the 'previous' versions
4368 // do not have the jmethodID cache filled in. Instead, we need to lookup jmethodID for each method and this
4369 // is expensive - O(n) for one jmethodID lookup. For all contained methods it is O(n^2).
4370 // The reason for expensive jmethodID lookup for each method is that there is no direct link between method and jmethodID.
4371 void InstanceKlass::clear_jmethod_ids(InstanceKlass* klass) {
4372 Array<Method*>* method_refs = klass->methods();
4373 for (int k = 0; k < method_refs->length(); k++) {
4374 Method* method = method_refs->at(k);
4375 if (method != nullptr && method->is_obsolete()) {
4376 method->clear_jmethod_id();
4377 }
4378 }
4379 }
4380
4381 // Purge previous versions before adding new previous versions of the class and
4382 // during class unloading.
4383 void InstanceKlass::purge_previous_version_list() {
4384 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
4385 assert(has_been_redefined(), "Should only be called for main class");
4386
4387 // Quick exit.
4388 if (previous_versions() == nullptr) {
4389 return;
4390 }
4391
4392 // This klass has previous versions so see what we can cleanup
4393 // while it is safe to do so.
4394
4395 int deleted_count = 0; // leave debugging breadcrumbs
4396 int live_count = 0;
4397 ClassLoaderData* loader_data = class_loader_data();
4398 assert(loader_data != nullptr, "should never be null");
4399
4400 ResourceMark rm;
4401 log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name());
4402
4403 // previous versions are linked together through the InstanceKlass
4404 InstanceKlass* pv_node = previous_versions();
4405 InstanceKlass* last = this;
4406 int version = 0;
4407
4408 // check the previous versions list
4409 for (; pv_node != nullptr; ) {
4410
4411 ConstantPool* pvcp = pv_node->constants();
4412 assert(pvcp != nullptr, "cp ref was unexpectedly cleared");
4413
4414 if (!pvcp->on_stack()) {
4415 // If the constant pool isn't on stack, none of the methods
4416 // are executing. Unlink this previous_version.
4417 // The previous version InstanceKlass is on the ClassLoaderData deallocate list
4418 // so will be deallocated during the next phase of class unloading.
4419 log_trace(redefine, class, iklass, purge)
4420 ("previous version " PTR_FORMAT " is dead.", p2i(pv_node));
4421 // Unlink from previous version list.
4422 assert(pv_node->class_loader_data() == loader_data, "wrong loader_data");
4423 InstanceKlass* next = pv_node->previous_versions();
4424 clear_jmethod_ids(pv_node); // jmethodID maintenance for the unloaded class
4425 pv_node->link_previous_versions(nullptr); // point next to null
4426 last->link_previous_versions(next);
4427 // Delete this node directly. Nothing is referring to it and we don't
4428 // want it to increase the counter for metadata to delete in CLDG.
4429 MetadataFactory::free_metadata(loader_data, pv_node);
4430 pv_node = next;
4431 deleted_count++;
4432 version++;
4433 continue;
4434 } else {
4435 assert(pvcp->pool_holder() != nullptr, "Constant pool with no holder");
4436 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
4437 live_count++;
4438 if (pvcp->is_shared()) {
4439 // Shared previous versions can never be removed so no cleaning is needed.
4440 log_trace(redefine, class, iklass, purge)("previous version " PTR_FORMAT " is shared", p2i(pv_node));
4441 } else {
4442 // Previous version alive, set that clean is needed for next time.
4443 _should_clean_previous_versions = true;
4444 log_trace(redefine, class, iklass, purge)("previous version " PTR_FORMAT " is alive", p2i(pv_node));
4445 }
4446 }
4447
4448 // next previous version
4449 last = pv_node;
4450 pv_node = pv_node->previous_versions();
4451 version++;
4452 }
4453 log_trace(redefine, class, iklass, purge)
4454 ("previous version stats: live=%d, deleted=%d", live_count, deleted_count);
4455 }
4456
4457 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods,
4458 int emcp_method_count) {
4459 int obsolete_method_count = old_methods->length() - emcp_method_count;
4460
4461 if (emcp_method_count != 0 && obsolete_method_count != 0 &&
4462 _previous_versions != nullptr) {
4463 // We have a mix of obsolete and EMCP methods so we have to
4464 // clear out any matching EMCP method entries the hard way.
4465 int local_count = 0;
4466 for (int i = 0; i < old_methods->length(); i++) {
4467 Method* old_method = old_methods->at(i);
4468 if (old_method->is_obsolete()) {
4469 // only obsolete methods are interesting
4470 Symbol* m_name = old_method->name();
4471 Symbol* m_signature = old_method->signature();
4472
4473 // previous versions are linked together through the InstanceKlass
4474 int j = 0;
4475 for (InstanceKlass* prev_version = _previous_versions;
4476 prev_version != nullptr;
4477 prev_version = prev_version->previous_versions(), j++) {
4478
4479 Array<Method*>* method_refs = prev_version->methods();
4480 for (int k = 0; k < method_refs->length(); k++) {
4481 Method* method = method_refs->at(k);
4482
4483 if (!method->is_obsolete() &&
4484 method->name() == m_name &&
4485 method->signature() == m_signature) {
4486 // The current RedefineClasses() call has made all EMCP
4487 // versions of this method obsolete so mark it as obsolete
4488 log_trace(redefine, class, iklass, add)
4489 ("%s(%s): flush obsolete method @%d in version @%d",
4490 m_name->as_C_string(), m_signature->as_C_string(), k, j);
4491
4492 method->set_is_obsolete();
4493 break;
4494 }
4495 }
4496
4497 // The previous loop may not find a matching EMCP method, but
4498 // that doesn't mean that we can optimize and not go any
4499 // further back in the PreviousVersion generations. The EMCP
4500 // method for this generation could have already been made obsolete,
4501 // but there still may be an older EMCP method that has not
4502 // been made obsolete.
4503 }
4504
4505 if (++local_count >= obsolete_method_count) {
4506 // no more obsolete methods so bail out now
4507 break;
4508 }
4509 }
4510 }
4511 }
4512 }
4513
4514 // Save the scratch_class as the previous version if any of the methods are running.
4515 // The previous_versions are used to set breakpoints in EMCP methods and they are
4516 // also used to clean MethodData links to redefined methods that are no longer running.
4517 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class,
4518 int emcp_method_count) {
4519 assert(Thread::current()->is_VM_thread(),
4520 "only VMThread can add previous versions");
4521
4522 ResourceMark rm;
4523 log_trace(redefine, class, iklass, add)
4524 ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count);
4525
4526 // Clean out old previous versions for this class
4527 purge_previous_version_list();
4528
4529 // Mark newly obsolete methods in remaining previous versions. An EMCP method from
4530 // a previous redefinition may be made obsolete by this redefinition.
4531 Array<Method*>* old_methods = scratch_class->methods();
4532 mark_newly_obsolete_methods(old_methods, emcp_method_count);
4533
4534 // If the constant pool for this previous version of the class
4535 // is not marked as being on the stack, then none of the methods
4536 // in this previous version of the class are on the stack so
4537 // we don't need to add this as a previous version.
4538 ConstantPool* cp_ref = scratch_class->constants();
4539 if (!cp_ref->on_stack()) {
4540 log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running");
4541 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class);
4542 return;
4543 }
4544
4545 // Add previous version if any methods are still running or if this is
4546 // a shared class which should never be removed.
4547 assert(scratch_class->previous_versions() == nullptr, "shouldn't have a previous version");
4548 scratch_class->link_previous_versions(previous_versions());
4549 link_previous_versions(scratch_class);
4550 if (cp_ref->is_shared()) {
4551 log_trace(redefine, class, iklass, add) ("scratch class added; class is shared");
4552 } else {
4553 // We only set clean_previous_versions flag for processing during class
4554 // unloading for non-shared classes.
4555 _should_clean_previous_versions = true;
4556 log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack.");
4557 }
4558 } // end add_previous_version()
4559
4560 #endif // INCLUDE_JVMTI
4561
4562 Method* InstanceKlass::method_with_idnum(int idnum) {
4563 Method* m = nullptr;
4564 if (idnum < methods()->length()) {
4565 m = methods()->at(idnum);
4566 }
4567 if (m == nullptr || m->method_idnum() != idnum) {
4568 for (int index = 0; index < methods()->length(); ++index) {
4569 m = methods()->at(index);
4570 if (m->method_idnum() == idnum) {
4571 return m;
4572 }
4573 }
4574 // None found, return null for the caller to handle.
4575 return nullptr;
4576 }
4577 return m;
4578 }
4579
4580
4581 Method* InstanceKlass::method_with_orig_idnum(int idnum) {
4582 if (idnum >= methods()->length()) {
4583 return nullptr;
4584 }
4585 Method* m = methods()->at(idnum);
4586 if (m != nullptr && m->orig_method_idnum() == idnum) {
4587 return m;
4588 }
4589 // Obsolete method idnum does not match the original idnum
4590 for (int index = 0; index < methods()->length(); ++index) {
4591 m = methods()->at(index);
4592 if (m->orig_method_idnum() == idnum) {
4593 return m;
4594 }
4595 }
4596 // None found, return null for the caller to handle.
4597 return nullptr;
4598 }
4599
4600
4601 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) {
4602 InstanceKlass* holder = get_klass_version(version);
4603 if (holder == nullptr) {
4604 return nullptr; // The version of klass is gone, no method is found
4605 }
4606 Method* method = holder->method_with_orig_idnum(idnum);
4607 return method;
4608 }
4609
4610 #if INCLUDE_JVMTI
4611 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() {
4612 return _cached_class_file;
4613 }
4614
4615 jint InstanceKlass::get_cached_class_file_len() {
4616 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
4617 }
4618
4619 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
4620 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
4621 }
4622 #endif
4623
4624 // Make a step iterating over the class hierarchy under the root class.
4625 // Skips subclasses if requested.
4626 void ClassHierarchyIterator::next() {
4627 assert(_current != nullptr, "required");
4628 if (_visit_subclasses && _current->subklass() != nullptr) {
4629 _current = _current->subklass();
4630 return; // visit next subclass
4631 }
4632 _visit_subclasses = true; // reset
4633 while (_current->next_sibling() == nullptr && _current != _root) {
4634 _current = _current->superklass(); // backtrack; no more sibling subclasses left
4635 }
4636 if (_current == _root) {
4637 // Iteration is over (back at root after backtracking). Invalidate the iterator.
4638 _current = nullptr;
4639 return;
4640 }
4641 _current = _current->next_sibling();
4642 return; // visit next sibling subclass
4643 }