1 /*
2 * Copyright (c) 1997, 2020, 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 "jvm.h"
27 #include "aot/aotLoader.hpp"
28 #include "classfile/classFileParser.hpp"
29 #include "classfile/classFileStream.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/classLoaderData.inline.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/resolutionErrors.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/systemDictionaryShared.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "code/dependencyContext.hpp"
41 #include "compiler/compileBroker.hpp"
42 #include "gc/shared/collectedHeap.inline.hpp"
43 #include "interpreter/oopMapCache.hpp"
44 #include "interpreter/rewriter.hpp"
45 #include "jvmtifiles/jvmti.h"
46 #include "logging/log.hpp"
47 #include "logging/logMessage.hpp"
48 #include "logging/logStream.hpp"
49 #include "memory/allocation.inline.hpp"
50 #include "memory/iterator.inline.hpp"
51 #include "memory/metadataFactory.hpp"
52 #include "memory/metaspaceClosure.hpp"
53 #include "memory/metaspaceShared.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/resourceArea.hpp"
56 #include "memory/universe.hpp"
57 #include "oops/fieldStreams.inline.hpp"
58 #include "oops/constantPool.hpp"
59 #include "oops/instanceClassLoaderKlass.hpp"
60 #include "oops/instanceKlass.inline.hpp"
61 #include "oops/instanceMirrorKlass.hpp"
62 #include "oops/instanceOop.hpp"
63 #include "oops/klass.inline.hpp"
64 #include "oops/method.hpp"
65 #include "oops/oop.inline.hpp"
66 #include "oops/recordComponent.hpp"
67 #include "oops/symbol.hpp"
68 #include "prims/jvmtiExport.hpp"
69 #include "prims/jvmtiRedefineClasses.hpp"
70 #include "prims/jvmtiThreadState.hpp"
71 #include "prims/methodComparator.hpp"
72 #include "runtime/arguments.hpp"
73 #include "runtime/atomic.hpp"
74 #include "runtime/biasedLocking.hpp"
75 #include "runtime/fieldDescriptor.inline.hpp"
76 #include "runtime/handles.inline.hpp"
77 #include "runtime/javaCalls.hpp"
78 #include "runtime/mutexLocker.hpp"
79 #include "runtime/orderAccess.hpp"
80 #include "runtime/thread.inline.hpp"
81 #include "services/classLoadingService.hpp"
82 #include "services/threadService.hpp"
83 #include "utilities/dtrace.hpp"
84 #include "utilities/events.hpp"
85 #include "utilities/macros.hpp"
86 #include "utilities/stringUtils.hpp"
87 #ifdef COMPILER1
88 #include "c1/c1_Compiler.hpp"
89 #endif
90 #if INCLUDE_JFR
91 #include "jfr/jfrEvents.hpp"
92 #endif
93
94
95 #ifdef DTRACE_ENABLED
96
97
98 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED
99 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE
100 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT
101 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS
102 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED
103 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT
104 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR
105 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END
106 #define DTRACE_CLASSINIT_PROBE(type, thread_type) \
107 { \
108 char* data = NULL; \
109 int len = 0; \
110 Symbol* clss_name = name(); \
111 if (clss_name != NULL) { \
112 data = (char*)clss_name->bytes(); \
113 len = clss_name->utf8_length(); \
114 } \
115 HOTSPOT_CLASS_INITIALIZATION_##type( \
116 data, len, (void*)class_loader(), thread_type); \
117 }
118
119 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) \
120 { \
121 char* data = NULL; \
122 int len = 0; \
123 Symbol* clss_name = name(); \
124 if (clss_name != NULL) { \
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, wait); \
130 }
131
132 #else // ndef DTRACE_ENABLED
133
134 #define DTRACE_CLASSINIT_PROBE(type, thread_type)
135 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait)
136
137 #endif // ndef DTRACE_ENABLED
138
139
140 static inline bool is_class_loader(const Symbol* class_name,
141 const ClassFileParser& parser) {
142 assert(class_name != NULL, "invariant");
143
144 if (class_name == vmSymbols::java_lang_ClassLoader()) {
145 return true;
146 }
147
148 if (SystemDictionary::ClassLoader_klass_loaded()) {
149 const Klass* const super_klass = parser.super_klass();
150 if (super_klass != NULL) {
151 if (super_klass->is_subtype_of(SystemDictionary::ClassLoader_klass())) {
152 return true;
153 }
154 }
155 }
156 return false;
157 }
158
159 // private: called to verify that k is a static member of this nest.
160 // We know that k is an instance class in the same package and hence the
161 // same classloader.
162 bool InstanceKlass::has_nest_member(InstanceKlass* k, TRAPS) const {
163 assert(!is_hidden(), "unexpected hidden class");
164 if (_nest_members == NULL || _nest_members == Universe::the_empty_short_array()) {
165 if (log_is_enabled(Trace, class, nestmates)) {
166 ResourceMark rm(THREAD);
167 log_trace(class, nestmates)("Checked nest membership of %s in non-nest-host class %s",
168 k->external_name(), this->external_name());
169 }
170 return false;
171 }
172
173 if (log_is_enabled(Trace, class, nestmates)) {
174 ResourceMark rm(THREAD);
175 log_trace(class, nestmates)("Checking nest membership of %s in %s",
176 k->external_name(), this->external_name());
177 }
178
179 // Check for a resolved cp entry , else fall back to a name check.
180 // We don't want to resolve any class other than the one being checked.
181 for (int i = 0; i < _nest_members->length(); i++) {
182 int cp_index = _nest_members->at(i);
183 if (_constants->tag_at(cp_index).is_klass()) {
184 Klass* k2 = _constants->klass_at(cp_index, THREAD);
185 assert(!HAS_PENDING_EXCEPTION || PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass()),
186 "Exceptions should not be possible here");
187 if (k2 == k) {
188 log_trace(class, nestmates)("- class is listed at nest_members[%d] => cp[%d]", i, cp_index);
189 return true;
190 }
191 }
192 else {
193 Symbol* name = _constants->klass_name_at(cp_index);
194 if (name == k->name()) {
195 log_trace(class, nestmates)("- Found it at nest_members[%d] => cp[%d]", i, cp_index);
196
197 // Names match so check actual klass. This may trigger class loading if
198 // it doesn't match though that should be impossible as it means one classloader
199 // has defined two different classes with the same name! A compiler thread won't be
200 // able to perform that loading but we can't exclude the compiler threads from
201 // executing this logic. But it should actually be impossible to trigger loading here.
202 Klass* k2 = _constants->klass_at(cp_index, THREAD);
203 assert(!HAS_PENDING_EXCEPTION || PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass()),
204 "Exceptions should not be possible here");
205 if (k2 == k) {
206 log_trace(class, nestmates)("- class is listed as a nest member");
207 return true;
208 }
209 else {
210 // same name but different klass!
211 log_trace(class, nestmates)(" - klass comparison failed!");
212 // can't have two names the same, so we're done
213 return false;
214 }
215 }
216 }
217 }
218 log_trace(class, nestmates)("- class is NOT a nest member!");
219 return false;
220 }
221
222 // Called to verify that k is a permitted subclass of this class
223 bool InstanceKlass::has_as_permitted_subclass(const InstanceKlass* k) const {
224 Thread* THREAD = Thread::current();
225 assert(k != NULL, "sanity check");
226 assert(_permitted_subclasses != NULL && _permitted_subclasses != Universe::the_empty_short_array(),
227 "unexpected empty _permitted_subclasses array");
228
229 if (log_is_enabled(Trace, class, sealed)) {
230 ResourceMark rm(THREAD);
231 log_trace(class, sealed)("Checking for permitted subclass of %s in %s",
232 k->external_name(), this->external_name());
233 }
234
235 // Check that the class and its super are in the same module.
236 if (k->module() != this->module()) {
237 ResourceMark rm(THREAD);
238 log_trace(class, sealed)("Check failed for same module of permitted subclass %s and sealed class %s",
239 k->external_name(), this->external_name());
240 return false;
241 }
242
243 if (!k->is_public() && !is_same_class_package(k)) {
244 ResourceMark rm(THREAD);
245 log_trace(class, sealed)("Check failed, subclass %s not public and not in the same package as sealed class %s",
246 k->external_name(), this->external_name());
247 return false;
248 }
249
250 // Check for a resolved cp entry, else fall back to a name check.
251 // We don't want to resolve any class other than the one being checked.
252 for (int i = 0; i < _permitted_subclasses->length(); i++) {
253 int cp_index = _permitted_subclasses->at(i);
254 if (_constants->tag_at(cp_index).is_klass()) {
255 Klass* k2 = _constants->klass_at(cp_index, THREAD);
256 assert(!HAS_PENDING_EXCEPTION, "Unexpected exception");
257 if (k2 == k) {
258 log_trace(class, sealed)("- class is listed at permitted_subclasses[%d] => cp[%d]", i, cp_index);
259 return true;
260 }
261 } else {
262 Symbol* name = _constants->klass_name_at(cp_index);
263 if (name == k->name()) {
264 log_trace(class, sealed)("- Found it at permitted_subclasses[%d] => cp[%d]", i, cp_index);
265 return true;
266 }
267 }
268 }
269 log_trace(class, sealed)("- class is NOT a permitted subclass!");
270 return false;
271 }
272
273 // Return nest-host class, resolving, validating and saving it if needed.
274 // In cases where this is called from a thread that cannot do classloading
275 // (such as a native JIT thread) then we simply return NULL, which in turn
276 // causes the access check to return false. Such code will retry the access
277 // from a more suitable environment later. Otherwise the _nest_host is always
278 // set once this method returns.
279 // Any errors from nest-host resolution must be preserved so they can be queried
280 // from higher-level access checking code, and reported as part of access checking
281 // exceptions.
282 // VirtualMachineErrors are propagated with a NULL return.
283 // Under any conditions where the _nest_host can be set to non-NULL the resulting
284 // value of it and, if applicable, the nest host resolution/validation error,
285 // are idempotent.
286 InstanceKlass* InstanceKlass::nest_host(TRAPS) {
287 InstanceKlass* nest_host_k = _nest_host;
288 if (nest_host_k != NULL) {
289 return nest_host_k;
290 }
291
292 ResourceMark rm(THREAD);
293
294 // need to resolve and save our nest-host class.
295 if (_nest_host_index != 0) { // we have a real nest_host
296 // Before trying to resolve check if we're in a suitable context
297 if (!THREAD->can_call_java() && !_constants->tag_at(_nest_host_index).is_klass()) {
298 log_trace(class, nestmates)("Rejected resolution of nest-host of %s in unsuitable thread",
299 this->external_name());
300 return NULL; // sentinel to say "try again from a different context"
301 }
302
303 log_trace(class, nestmates)("Resolving nest-host of %s using cp entry for %s",
304 this->external_name(),
305 _constants->klass_name_at(_nest_host_index)->as_C_string());
306
307 Klass* k = _constants->klass_at(_nest_host_index, THREAD);
308 if (HAS_PENDING_EXCEPTION) {
309 if (PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass())) {
310 return NULL; // propagate VMEs
311 }
312 stringStream ss;
313 char* target_host_class = _constants->klass_name_at(_nest_host_index)->as_C_string();
314 ss.print("Nest host resolution of %s with host %s failed: ",
315 this->external_name(), target_host_class);
316 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
317 const char* msg = ss.as_string(true /* on C-heap */);
318 constantPoolHandle cph(THREAD, constants());
319 SystemDictionary::add_nest_host_error(cph, _nest_host_index, msg);
320 CLEAR_PENDING_EXCEPTION;
321
322 log_trace(class, nestmates)("%s", msg);
323 } else {
324 // A valid nest-host is an instance class in the current package that lists this
325 // class as a nest member. If any of these conditions are not met the class is
326 // its own nest-host.
327 const char* error = NULL;
328
329 // JVMS 5.4.4 indicates package check comes first
330 if (is_same_class_package(k)) {
331 // Now check actual membership. We can't be a member if our "host" is
332 // not an instance class.
333 if (k->is_instance_klass()) {
334 nest_host_k = InstanceKlass::cast(k);
335 bool is_member = nest_host_k->has_nest_member(this, THREAD);
336 // exception is rare, perhaps impossible
337 if (!HAS_PENDING_EXCEPTION) {
338 if (is_member) {
339 _nest_host = nest_host_k; // save resolved nest-host value
340
341 log_trace(class, nestmates)("Resolved nest-host of %s to %s",
342 this->external_name(), k->external_name());
343 return nest_host_k;
344 } else {
345 error = "current type is not listed as a nest member";
346 }
347 } else {
348 if (PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass())) {
349 return NULL; // propagate VMEs
350 }
351 stringStream ss;
352 ss.print("exception on member check: ");
353 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
354 error = ss.as_string();
355 }
356 } else {
357 error = "host is not an instance class";
358 }
359 } else {
360 error = "types are in different packages";
361 }
362
363 // something went wrong, so record what and log it
364 {
365 stringStream ss;
366 ss.print("Type %s (loader: %s) is not a nest member of type %s (loader: %s): %s",
367 this->external_name(),
368 this->class_loader_data()->loader_name_and_id(),
369 k->external_name(),
370 k->class_loader_data()->loader_name_and_id(),
371 error);
372 const char* msg = ss.as_string(true /* on C-heap */);
373 constantPoolHandle cph(THREAD, constants());
374 SystemDictionary::add_nest_host_error(cph, _nest_host_index, msg);
375 log_trace(class, nestmates)("%s", msg);
376 }
377 }
378 } else {
379 log_trace(class, nestmates)("Type %s is not part of a nest: setting nest-host to self",
380 this->external_name());
381 }
382
383 // Either not in an explicit nest, or else an error occurred, so
384 // the nest-host is set to `this`. Any thread that sees this assignment
385 // will also see any setting of nest_host_error(), if applicable.
386 return (_nest_host = this);
387 }
388
389 // Dynamic nest member support: set this class's nest host to the given class.
390 // This occurs as part of the class definition, as soon as the instanceKlass
391 // has been created and doesn't require further resolution. The code:
392 // lookup().defineHiddenClass(bytes_for_X, NESTMATE);
393 // results in:
394 // class_of_X.set_nest_host(lookup().lookupClass().getNestHost())
395 // If it has an explicit _nest_host_index or _nest_members, these will be ignored.
396 // We also know the "host" is a valid nest-host in the same package so we can
397 // assert some of those facts.
398 void InstanceKlass::set_nest_host(InstanceKlass* host, TRAPS) {
399 assert(is_hidden(), "must be a hidden class");
400 assert(host != NULL, "NULL nest host specified");
401 assert(_nest_host == NULL, "current class has resolved nest-host");
402 assert(nest_host_error(THREAD) == NULL, "unexpected nest host resolution error exists: %s",
403 nest_host_error(THREAD));
404 assert((host->_nest_host == NULL && host->_nest_host_index == 0) ||
405 (host->_nest_host == host), "proposed host is not a valid nest-host");
406 // Can't assert this as package is not set yet:
407 // assert(is_same_class_package(host), "proposed host is in wrong package");
408
409 if (log_is_enabled(Trace, class, nestmates)) {
410 ResourceMark rm(THREAD);
411 const char* msg = "";
412 // a hidden class does not expect a statically defined nest-host
413 if (_nest_host_index > 0) {
414 msg = "(the NestHost attribute in the current class is ignored)";
415 } else if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
416 msg = "(the NestMembers attribute in the current class is ignored)";
417 }
418 log_trace(class, nestmates)("Injected type %s into the nest of %s %s",
419 this->external_name(),
420 host->external_name(),
421 msg);
422 }
423 // set dynamic nest host
424 _nest_host = host;
425 // Record dependency to keep nest host from being unloaded before this class.
426 ClassLoaderData* this_key = class_loader_data();
427 this_key->record_dependency(host);
428 }
429
430 // check if 'this' and k are nestmates (same nest_host), or k is our nest_host,
431 // or we are k's nest_host - all of which is covered by comparing the two
432 // resolved_nest_hosts.
433 // Any exceptions (i.e. VMEs) are propagated.
434 bool InstanceKlass::has_nestmate_access_to(InstanceKlass* k, TRAPS) {
435
436 assert(this != k, "this should be handled by higher-level code");
437
438 // Per JVMS 5.4.4 we first resolve and validate the current class, then
439 // the target class k.
440
441 InstanceKlass* cur_host = nest_host(CHECK_false);
442 if (cur_host == NULL) {
443 return false;
444 }
445
446 Klass* k_nest_host = k->nest_host(CHECK_false);
447 if (k_nest_host == NULL) {
448 return false;
449 }
450
451 bool access = (cur_host == k_nest_host);
452
453 ResourceMark rm(THREAD);
454 log_trace(class, nestmates)("Class %s does %shave nestmate access to %s",
455 this->external_name(),
456 access ? "" : "NOT ",
457 k->external_name());
458 return access;
459 }
460
461 const char* InstanceKlass::nest_host_error(TRAPS) {
462 if (_nest_host_index == 0) {
463 return NULL;
464 } else {
465 constantPoolHandle cph(THREAD, constants());
466 return SystemDictionary::find_nest_host_error(cph, (int)_nest_host_index);
467 }
468 }
469
470 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) {
471 bool is_hidden_or_anonymous = parser.is_hidden() || parser.is_unsafe_anonymous();
472 const int size = InstanceKlass::size(parser.vtable_size(),
473 parser.itable_size(),
474 nonstatic_oop_map_size(parser.total_oop_map_count()),
475 parser.is_interface(),
476 parser.is_unsafe_anonymous(),
477 should_store_fingerprint(is_hidden_or_anonymous));
478
479 const Symbol* const class_name = parser.class_name();
480 assert(class_name != NULL, "invariant");
481 ClassLoaderData* loader_data = parser.loader_data();
482 assert(loader_data != NULL, "invariant");
483
484 InstanceKlass* ik;
485
486 // Allocation
487 if (REF_NONE == parser.reference_type()) {
488 if (class_name == vmSymbols::java_lang_Class()) {
489 // mirror
490 ik = new (loader_data, size, THREAD) InstanceMirrorKlass(parser);
491 }
492 else if (is_class_loader(class_name, parser)) {
493 // class loader
494 ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser);
495 } else {
496 // normal
497 ik = new (loader_data, size, THREAD) InstanceKlass(parser, InstanceKlass::_kind_other);
498 }
499 } else {
500 // reference
501 ik = new (loader_data, size, THREAD) InstanceRefKlass(parser);
502 }
503
504 // Check for pending exception before adding to the loader data and incrementing
505 // class count. Can get OOM here.
506 if (HAS_PENDING_EXCEPTION) {
507 return NULL;
508 }
509
510 return ik;
511 }
512
513
514 // copy method ordering from resource area to Metaspace
515 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) {
516 if (m != NULL) {
517 // allocate a new array and copy contents (memcpy?)
518 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
519 for (int i = 0; i < m->length(); i++) {
520 _method_ordering->at_put(i, m->at(i));
521 }
522 } else {
523 _method_ordering = Universe::the_empty_int_array();
524 }
525 }
526
527 // create a new array of vtable_indices for default methods
528 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
529 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
530 assert(default_vtable_indices() == NULL, "only create once");
531 set_default_vtable_indices(vtable_indices);
532 return vtable_indices;
533 }
534
535 InstanceKlass::InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id) :
536 Klass(id),
537 _nest_members(NULL),
538 _nest_host(NULL),
539 _permitted_subclasses(NULL),
540 _record_components(NULL),
541 _static_field_size(parser.static_field_size()),
542 _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())),
543 _itable_len(parser.itable_size()),
544 _nest_host_index(0),
545 _init_state(allocated),
546 _reference_type(parser.reference_type()),
547 _init_thread(NULL)
548 {
549 set_vtable_length(parser.vtable_size());
550 set_kind(kind);
551 set_access_flags(parser.access_flags());
552 if (parser.is_hidden()) set_is_hidden();
553 set_is_unsafe_anonymous(parser.is_unsafe_anonymous());
554 set_layout_helper(Klass::instance_layout_helper(parser.layout_size(),
555 false));
556
557 assert(NULL == _methods, "underlying memory not zeroed?");
558 assert(is_instance_klass(), "is layout incorrect?");
559 assert(size_helper() == parser.layout_size(), "incorrect size_helper?");
560
561 // Set biased locking bit for all instances of this class; it will be
562 // cleared if revocation occurs too often for this type
563 if (UseBiasedLocking && BiasedLocking::enabled()) {
564 set_prototype_header(markWord::biased_locking_prototype());
565 }
566 }
567
568 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
569 Array<Method*>* methods) {
570 if (methods != NULL && methods != Universe::the_empty_method_array() &&
571 !methods->is_shared()) {
572 for (int i = 0; i < methods->length(); i++) {
573 Method* method = methods->at(i);
574 if (method == NULL) continue; // maybe null if error processing
575 // Only want to delete methods that are not executing for RedefineClasses.
576 // The previous version will point to them so they're not totally dangling
577 assert (!method->on_stack(), "shouldn't be called with methods on stack");
578 MetadataFactory::free_metadata(loader_data, method);
579 }
580 MetadataFactory::free_array<Method*>(loader_data, methods);
581 }
582 }
583
584 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
585 const Klass* super_klass,
586 Array<InstanceKlass*>* local_interfaces,
587 Array<InstanceKlass*>* transitive_interfaces) {
588 // Only deallocate transitive interfaces if not empty, same as super class
589 // or same as local interfaces. See code in parseClassFile.
590 Array<InstanceKlass*>* ti = transitive_interfaces;
591 if (ti != Universe::the_empty_instance_klass_array() && ti != local_interfaces) {
592 // check that the interfaces don't come from super class
593 Array<InstanceKlass*>* sti = (super_klass == NULL) ? NULL :
594 InstanceKlass::cast(super_klass)->transitive_interfaces();
595 if (ti != sti && ti != NULL && !ti->is_shared()) {
596 MetadataFactory::free_array<InstanceKlass*>(loader_data, ti);
597 }
598 }
599
600 // local interfaces can be empty
601 if (local_interfaces != Universe::the_empty_instance_klass_array() &&
602 local_interfaces != NULL && !local_interfaces->is_shared()) {
603 MetadataFactory::free_array<InstanceKlass*>(loader_data, local_interfaces);
604 }
605 }
606
607 void InstanceKlass::deallocate_record_components(ClassLoaderData* loader_data,
608 Array<RecordComponent*>* record_components) {
609 if (record_components != NULL && !record_components->is_shared()) {
610 for (int i = 0; i < record_components->length(); i++) {
611 RecordComponent* record_component = record_components->at(i);
612 MetadataFactory::free_metadata(loader_data, record_component);
613 }
614 MetadataFactory::free_array<RecordComponent*>(loader_data, record_components);
615 }
616 }
617
618 // This function deallocates the metadata and C heap pointers that the
619 // InstanceKlass points to.
620 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
621
622 // Orphan the mirror first, CMS thinks it's still live.
623 if (java_mirror() != NULL) {
624 java_lang_Class::set_klass(java_mirror(), NULL);
625 }
626
627 // Also remove mirror from handles
628 loader_data->remove_handle(_java_mirror);
629
630 // Need to take this class off the class loader data list.
631 loader_data->remove_class(this);
632
633 // The array_klass for this class is created later, after error handling.
634 // For class redefinition, we keep the original class so this scratch class
635 // doesn't have an array class. Either way, assert that there is nothing
636 // to deallocate.
637 assert(array_klasses() == NULL, "array classes shouldn't be created for this class yet");
638
639 // Release C heap allocated data that this points to, which includes
640 // reference counting symbol names.
641 release_C_heap_structures_internal();
642
643 deallocate_methods(loader_data, methods());
644 set_methods(NULL);
645
646 deallocate_record_components(loader_data, record_components());
647 set_record_components(NULL);
648
649 if (method_ordering() != NULL &&
650 method_ordering() != Universe::the_empty_int_array() &&
651 !method_ordering()->is_shared()) {
652 MetadataFactory::free_array<int>(loader_data, method_ordering());
653 }
654 set_method_ordering(NULL);
655
656 // default methods can be empty
657 if (default_methods() != NULL &&
658 default_methods() != Universe::the_empty_method_array() &&
659 !default_methods()->is_shared()) {
660 MetadataFactory::free_array<Method*>(loader_data, default_methods());
661 }
662 // Do NOT deallocate the default methods, they are owned by superinterfaces.
663 set_default_methods(NULL);
664
665 // default methods vtable indices can be empty
666 if (default_vtable_indices() != NULL &&
667 !default_vtable_indices()->is_shared()) {
668 MetadataFactory::free_array<int>(loader_data, default_vtable_indices());
669 }
670 set_default_vtable_indices(NULL);
671
672
673 // This array is in Klass, but remove it with the InstanceKlass since
674 // this place would be the only caller and it can share memory with transitive
675 // interfaces.
676 if (secondary_supers() != NULL &&
677 secondary_supers() != Universe::the_empty_klass_array() &&
678 // see comments in compute_secondary_supers about the following cast
679 (address)(secondary_supers()) != (address)(transitive_interfaces()) &&
680 !secondary_supers()->is_shared()) {
681 MetadataFactory::free_array<Klass*>(loader_data, secondary_supers());
682 }
683 set_secondary_supers(NULL);
684
685 deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces());
686 set_transitive_interfaces(NULL);
687 set_local_interfaces(NULL);
688
689 if (fields() != NULL && !fields()->is_shared()) {
690 MetadataFactory::free_array<jushort>(loader_data, fields());
691 }
692 set_fields(NULL, 0);
693
694 // If a method from a redefined class is using this constant pool, don't
695 // delete it, yet. The new class's previous version will point to this.
696 if (constants() != NULL) {
697 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack");
698 if (!constants()->is_shared()) {
699 MetadataFactory::free_metadata(loader_data, constants());
700 }
701 // Delete any cached resolution errors for the constant pool
702 SystemDictionary::delete_resolution_error(constants());
703
704 set_constants(NULL);
705 }
706
707 if (inner_classes() != NULL &&
708 inner_classes() != Universe::the_empty_short_array() &&
709 !inner_classes()->is_shared()) {
710 MetadataFactory::free_array<jushort>(loader_data, inner_classes());
711 }
712 set_inner_classes(NULL);
713
714 if (nest_members() != NULL &&
715 nest_members() != Universe::the_empty_short_array() &&
716 !nest_members()->is_shared()) {
717 MetadataFactory::free_array<jushort>(loader_data, nest_members());
718 }
719 set_nest_members(NULL);
720
721 if (permitted_subclasses() != NULL &&
722 permitted_subclasses() != Universe::the_empty_short_array() &&
723 !permitted_subclasses()->is_shared()) {
724 MetadataFactory::free_array<jushort>(loader_data, permitted_subclasses());
725 }
726 set_permitted_subclasses(NULL);
727
728 // We should deallocate the Annotations instance if it's not in shared spaces.
729 if (annotations() != NULL && !annotations()->is_shared()) {
730 MetadataFactory::free_metadata(loader_data, annotations());
731 }
732 set_annotations(NULL);
733
734 if (Arguments::is_dumping_archive()) {
735 SystemDictionaryShared::remove_dumptime_info(this);
736 }
737 }
738
739 bool InstanceKlass::is_sealed() const {
740 return _permitted_subclasses != NULL &&
741 _permitted_subclasses != Universe::the_empty_short_array() &&
742 _permitted_subclasses->length() > 0;
743 }
744
745 bool InstanceKlass::should_be_initialized() const {
746 return !is_initialized();
747 }
748
749 klassItable InstanceKlass::itable() const {
750 return klassItable(const_cast<InstanceKlass*>(this));
751 }
752
753 void InstanceKlass::eager_initialize(Thread *thread) {
754 if (!EagerInitialization) return;
755
756 if (this->is_not_initialized()) {
757 // abort if the the class has a class initializer
758 if (this->class_initializer() != NULL) return;
759
760 // abort if it is java.lang.Object (initialization is handled in genesis)
761 Klass* super_klass = super();
762 if (super_klass == NULL) return;
763
764 // abort if the super class should be initialized
765 if (!InstanceKlass::cast(super_klass)->is_initialized()) return;
766
767 // call body to expose the this pointer
768 eager_initialize_impl();
769 }
770 }
771
772 // JVMTI spec thinks there are signers and protection domain in the
773 // instanceKlass. These accessors pretend these fields are there.
774 // The hprof specification also thinks these fields are in InstanceKlass.
775 oop InstanceKlass::protection_domain() const {
776 // return the protection_domain from the mirror
777 return java_lang_Class::protection_domain(java_mirror());
778 }
779
780 // To remove these from requires an incompatible change and CCC request.
781 objArrayOop InstanceKlass::signers() const {
782 // return the signers from the mirror
783 return java_lang_Class::signers(java_mirror());
784 }
785
786 oop InstanceKlass::init_lock() const {
787 // return the init lock from the mirror
788 oop lock = java_lang_Class::init_lock(java_mirror());
789 // Prevent reordering with any access of initialization state
790 OrderAccess::loadload();
791 assert((oop)lock != NULL || !is_not_initialized(), // initialized or in_error state
792 "only fully initialized state can have a null lock");
793 return lock;
794 }
795
796 // Set the initialization lock to null so the object can be GC'ed. Any racing
797 // threads to get this lock will see a null lock and will not lock.
798 // That's okay because they all check for initialized state after getting
799 // the lock and return.
800 void InstanceKlass::fence_and_clear_init_lock() {
801 // make sure previous stores are all done, notably the init_state.
802 OrderAccess::storestore();
803 java_lang_Class::clear_init_lock(java_mirror());
804 assert(!is_not_initialized(), "class must be initialized now");
805 }
806
807 void InstanceKlass::eager_initialize_impl() {
808 EXCEPTION_MARK;
809 HandleMark hm(THREAD);
810 Handle h_init_lock(THREAD, init_lock());
811 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
812
813 // abort if someone beat us to the initialization
814 if (!is_not_initialized()) return; // note: not equivalent to is_initialized()
815
816 ClassState old_state = init_state();
817 link_class_impl(THREAD);
818 if (HAS_PENDING_EXCEPTION) {
819 CLEAR_PENDING_EXCEPTION;
820 // Abort if linking the class throws an exception.
821
822 // Use a test to avoid redundantly resetting the state if there's
823 // no change. Set_init_state() asserts that state changes make
824 // progress, whereas here we might just be spinning in place.
825 if (old_state != _init_state)
826 set_init_state(old_state);
827 } else {
828 // linking successfull, mark class as initialized
829 set_init_state(fully_initialized);
830 fence_and_clear_init_lock();
831 // trace
832 if (log_is_enabled(Info, class, init)) {
833 ResourceMark rm(THREAD);
834 log_info(class, init)("[Initialized %s without side effects]", external_name());
835 }
836 }
837 }
838
839
840 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization
841 // process. The step comments refers to the procedure described in that section.
842 // Note: implementation moved to static method to expose the this pointer.
843 void InstanceKlass::initialize(TRAPS) {
844 if (this->should_be_initialized()) {
845 initialize_impl(CHECK);
846 // Note: at this point the class may be initialized
847 // OR it may be in the state of being initialized
848 // in case of recursive initialization!
849 } else {
850 assert(is_initialized(), "sanity check");
851 }
852 }
853
854
855 bool InstanceKlass::verify_code(TRAPS) {
856 // 1) Verify the bytecodes
857 return Verifier::verify(this, should_verify_class(), THREAD);
858 }
859
860 void InstanceKlass::link_class(TRAPS) {
861 assert(is_loaded(), "must be loaded");
862 if (!is_linked()) {
863 link_class_impl(CHECK);
864 }
865 }
866
867 // Called to verify that a class can link during initialization, without
868 // throwing a VerifyError.
869 bool InstanceKlass::link_class_or_fail(TRAPS) {
870 assert(is_loaded(), "must be loaded");
871 if (!is_linked()) {
872 link_class_impl(CHECK_false);
873 }
874 return is_linked();
875 }
876
877 bool InstanceKlass::link_class_impl(TRAPS) {
878 if (DumpSharedSpaces && SystemDictionaryShared::has_class_failed_verification(this)) {
879 // This is for CDS dumping phase only -- we use the in_error_state to indicate that
880 // the class has failed verification. Throwing the NoClassDefFoundError here is just
881 // a convenient way to stop repeat attempts to verify the same (bad) class.
882 //
883 // Note that the NoClassDefFoundError is not part of the JLS, and should not be thrown
884 // if we are executing Java code. This is not a problem for CDS dumping phase since
885 // it doesn't execute any Java code.
886 ResourceMark rm(THREAD);
887 Exceptions::fthrow(THREAD_AND_LOCATION,
888 vmSymbols::java_lang_NoClassDefFoundError(),
889 "Class %s, or one of its supertypes, failed class initialization",
890 external_name());
891 return false;
892 }
893 // return if already verified
894 if (is_linked()) {
895 return true;
896 }
897
898 // Timing
899 // timer handles recursion
900 assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl");
901 JavaThread* jt = (JavaThread*)THREAD;
902
903 // link super class before linking this class
904 Klass* super_klass = super();
905 if (super_klass != NULL) {
906 if (super_klass->is_interface()) { // check if super class is an interface
907 ResourceMark rm(THREAD);
908 Exceptions::fthrow(
909 THREAD_AND_LOCATION,
910 vmSymbols::java_lang_IncompatibleClassChangeError(),
911 "class %s has interface %s as super class",
912 external_name(),
913 super_klass->external_name()
914 );
915 return false;
916 }
917
918 InstanceKlass* ik_super = InstanceKlass::cast(super_klass);
919 ik_super->link_class_impl(CHECK_false);
920 }
921
922 // link all interfaces implemented by this class before linking this class
923 Array<InstanceKlass*>* interfaces = local_interfaces();
924 int num_interfaces = interfaces->length();
925 for (int index = 0; index < num_interfaces; index++) {
926 InstanceKlass* interk = interfaces->at(index);
927 interk->link_class_impl(CHECK_false);
928 }
929
930 // in case the class is linked in the process of linking its superclasses
931 if (is_linked()) {
932 return true;
933 }
934
935 // trace only the link time for this klass that includes
936 // the verification time
937 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
938 ClassLoader::perf_class_link_selftime(),
939 ClassLoader::perf_classes_linked(),
940 jt->get_thread_stat()->perf_recursion_counts_addr(),
941 jt->get_thread_stat()->perf_timers_addr(),
942 PerfClassTraceTime::CLASS_LINK);
943
944 // verification & rewriting
945 {
946 HandleMark hm(THREAD);
947 Handle h_init_lock(THREAD, init_lock());
948 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
949 // rewritten will have been set if loader constraint error found
950 // on an earlier link attempt
951 // don't verify or rewrite if already rewritten
952 //
953
954 if (!is_linked()) {
955 if (!is_rewritten()) {
956 {
957 bool verify_ok = verify_code(THREAD);
958 if (!verify_ok) {
959 return false;
960 }
961 }
962
963 // Just in case a side-effect of verify linked this class already
964 // (which can sometimes happen since the verifier loads classes
965 // using custom class loaders, which are free to initialize things)
966 if (is_linked()) {
967 return true;
968 }
969
970 // also sets rewritten
971 rewrite_class(CHECK_false);
972 } else if (is_shared()) {
973 SystemDictionaryShared::check_verification_constraints(this, CHECK_false);
974 }
975
976 // relocate jsrs and link methods after they are all rewritten
977 link_methods(CHECK_false);
978
979 // Initialize the vtable and interface table after
980 // methods have been rewritten since rewrite may
981 // fabricate new Method*s.
982 // also does loader constraint checking
983 //
984 // initialize_vtable and initialize_itable need to be rerun
985 // for a shared class if
986 // 1) the class is loaded by custom class loader or
987 // 2) the class is loaded by built-in class loader but failed to add archived loader constraints
988 bool need_init_table = true;
989 if (is_shared() && SystemDictionaryShared::check_linking_constraints(this, THREAD)) {
990 need_init_table = false;
991 }
992 if (need_init_table) {
993 vtable().initialize_vtable(true, CHECK_false);
994 itable().initialize_itable(true, CHECK_false);
995 }
996 #ifdef ASSERT
997 vtable().verify(tty, true);
998 // In case itable verification is ever added.
999 // itable().verify(tty, true);
1000 #endif
1001 set_init_state(linked);
1002 if (JvmtiExport::should_post_class_prepare()) {
1003 Thread *thread = THREAD;
1004 assert(thread->is_Java_thread(), "thread->is_Java_thread()");
1005 JvmtiExport::post_class_prepare((JavaThread *) thread, this);
1006 }
1007 }
1008 }
1009 return true;
1010 }
1011
1012 // Rewrite the byte codes of all of the methods of a class.
1013 // The rewriter must be called exactly once. Rewriting must happen after
1014 // verification but before the first method of the class is executed.
1015 void InstanceKlass::rewrite_class(TRAPS) {
1016 assert(is_loaded(), "must be loaded");
1017 if (is_rewritten()) {
1018 assert(is_shared(), "rewriting an unshared class?");
1019 return;
1020 }
1021 Rewriter::rewrite(this, CHECK);
1022 set_rewritten();
1023 }
1024
1025 // Now relocate and link method entry points after class is rewritten.
1026 // This is outside is_rewritten flag. In case of an exception, it can be
1027 // executed more than once.
1028 void InstanceKlass::link_methods(TRAPS) {
1029 int len = methods()->length();
1030 for (int i = len-1; i >= 0; i--) {
1031 methodHandle m(THREAD, methods()->at(i));
1032
1033 // Set up method entry points for compiler and interpreter .
1034 m->link_method(m, CHECK);
1035 }
1036 }
1037
1038 // Eagerly initialize superinterfaces that declare default methods (concrete instance: any access)
1039 void InstanceKlass::initialize_super_interfaces(TRAPS) {
1040 assert (has_nonstatic_concrete_methods(), "caller should have checked this");
1041 for (int i = 0; i < local_interfaces()->length(); ++i) {
1042 InstanceKlass* ik = local_interfaces()->at(i);
1043
1044 // Initialization is depth first search ie. we start with top of the inheritance tree
1045 // has_nonstatic_concrete_methods drives searching superinterfaces since it
1046 // means has_nonstatic_concrete_methods in its superinterface hierarchy
1047 if (ik->has_nonstatic_concrete_methods()) {
1048 ik->initialize_super_interfaces(CHECK);
1049 }
1050
1051 // Only initialize() interfaces that "declare" concrete methods.
1052 if (ik->should_be_initialized() && ik->declares_nonstatic_concrete_methods()) {
1053 ik->initialize(CHECK);
1054 }
1055 }
1056 }
1057
1058 void InstanceKlass::initialize_impl(TRAPS) {
1059 HandleMark hm(THREAD);
1060
1061 // Make sure klass is linked (verified) before initialization
1062 // A class could already be verified, since it has been reflected upon.
1063 link_class(CHECK);
1064
1065 DTRACE_CLASSINIT_PROBE(required, -1);
1066
1067 bool wait = false;
1068
1069 assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl");
1070 JavaThread* jt = (JavaThread*)THREAD;
1071
1072 // refer to the JVM book page 47 for description of steps
1073 // Step 1
1074 {
1075 Handle h_init_lock(THREAD, init_lock());
1076 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
1077
1078 // Step 2
1079 // If we were to use wait() instead of waitInterruptibly() then
1080 // we might end up throwing IE from link/symbol resolution sites
1081 // that aren't expected to throw. This would wreak havoc. See 6320309.
1082 while (is_being_initialized() && !is_reentrant_initialization(jt)) {
1083 wait = true;
1084 jt->set_class_to_be_initialized(this);
1085 ol.wait_uninterruptibly(jt);
1086 jt->set_class_to_be_initialized(NULL);
1087 }
1088
1089 // Step 3
1090 if (is_being_initialized() && is_reentrant_initialization(jt)) {
1091 DTRACE_CLASSINIT_PROBE_WAIT(recursive, -1, wait);
1092 return;
1093 }
1094
1095 // Step 4
1096 if (is_initialized()) {
1097 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, -1, wait);
1098 return;
1099 }
1100
1101 // Step 5
1102 if (is_in_error_state()) {
1103 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait);
1104 ResourceMark rm(THREAD);
1105 const char* desc = "Could not initialize class ";
1106 const char* className = external_name();
1107 size_t msglen = strlen(desc) + strlen(className) + 1;
1108 char* message = NEW_RESOURCE_ARRAY(char, msglen);
1109 if (NULL == message) {
1110 // Out of memory: can't create detailed error message
1111 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className);
1112 } else {
1113 jio_snprintf(message, msglen, "%s%s", desc, className);
1114 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message);
1115 }
1116 }
1117
1118 // Step 6
1119 set_init_state(being_initialized);
1120 set_init_thread(jt);
1121 }
1122
1123 // Step 7
1124 // Next, if C is a class rather than an interface, initialize it's super class and super
1125 // interfaces.
1126 if (!is_interface()) {
1127 Klass* super_klass = super();
1128 if (super_klass != NULL && super_klass->should_be_initialized()) {
1129 super_klass->initialize(THREAD);
1130 }
1131 // If C implements any interface that declares a non-static, concrete method,
1132 // the initialization of C triggers initialization of its super interfaces.
1133 // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and
1134 // having a superinterface that declares, non-static, concrete methods
1135 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) {
1136 initialize_super_interfaces(THREAD);
1137 }
1138
1139 // If any exceptions, complete abruptly, throwing the same exception as above.
1140 if (HAS_PENDING_EXCEPTION) {
1141 Handle e(THREAD, PENDING_EXCEPTION);
1142 CLEAR_PENDING_EXCEPTION;
1143 {
1144 EXCEPTION_MARK;
1145 // Locks object, set state, and notify all waiting threads
1146 set_initialization_state_and_notify(initialization_error, THREAD);
1147 CLEAR_PENDING_EXCEPTION;
1148 }
1149 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait);
1150 THROW_OOP(e());
1151 }
1152 }
1153
1154
1155 // Look for aot compiled methods for this klass, including class initializer.
1156 AOTLoader::load_for_klass(this, THREAD);
1157
1158 // Step 8
1159 {
1160 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
1161 if (class_initializer() != NULL) {
1162 // Timer includes any side effects of class initialization (resolution,
1163 // etc), but not recursive entry into call_class_initializer().
1164 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
1165 ClassLoader::perf_class_init_selftime(),
1166 ClassLoader::perf_classes_inited(),
1167 jt->get_thread_stat()->perf_recursion_counts_addr(),
1168 jt->get_thread_stat()->perf_timers_addr(),
1169 PerfClassTraceTime::CLASS_CLINIT);
1170 call_class_initializer(THREAD);
1171 } else {
1172 // The elapsed time is so small it's not worth counting.
1173 if (UsePerfData) {
1174 ClassLoader::perf_classes_inited()->inc();
1175 }
1176 call_class_initializer(THREAD);
1177 }
1178 }
1179
1180 // Step 9
1181 if (!HAS_PENDING_EXCEPTION) {
1182 set_initialization_state_and_notify(fully_initialized, CHECK);
1183 {
1184 debug_only(vtable().verify(tty, true);)
1185 }
1186 }
1187 else {
1188 // Step 10 and 11
1189 Handle e(THREAD, PENDING_EXCEPTION);
1190 CLEAR_PENDING_EXCEPTION;
1191 // JVMTI has already reported the pending exception
1192 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1193 JvmtiExport::clear_detected_exception(jt);
1194 {
1195 EXCEPTION_MARK;
1196 set_initialization_state_and_notify(initialization_error, THREAD);
1197 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below
1198 // JVMTI has already reported the pending exception
1199 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1200 JvmtiExport::clear_detected_exception(jt);
1201 }
1202 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
1203 if (e->is_a(SystemDictionary::Error_klass())) {
1204 THROW_OOP(e());
1205 } else {
1206 JavaCallArguments args(e);
1207 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
1208 vmSymbols::throwable_void_signature(),
1209 &args);
1210 }
1211 }
1212 DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait);
1213 }
1214
1215
1216 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) {
1217 Handle h_init_lock(THREAD, init_lock());
1218 if (h_init_lock() != NULL) {
1219 ObjectLocker ol(h_init_lock, THREAD);
1220 set_init_thread(NULL); // reset _init_thread before changing _init_state
1221 set_init_state(state);
1222 fence_and_clear_init_lock();
1223 ol.notify_all(CHECK);
1224 } else {
1225 assert(h_init_lock() != NULL, "The initialization state should never be set twice");
1226 set_init_thread(NULL); // reset _init_thread before changing _init_state
1227 set_init_state(state);
1228 }
1229 }
1230
1231 Klass* InstanceKlass::implementor() const {
1232 Klass* volatile* k = adr_implementor();
1233 if (k == NULL) {
1234 return NULL;
1235 } else {
1236 // This load races with inserts, and therefore needs acquire.
1237 Klass* kls = Atomic::load_acquire(k);
1238 if (kls != NULL && !kls->is_loader_alive()) {
1239 return NULL; // don't return unloaded class
1240 } else {
1241 return kls;
1242 }
1243 }
1244 }
1245
1246
1247 void InstanceKlass::set_implementor(Klass* k) {
1248 assert_locked_or_safepoint(Compile_lock);
1249 assert(is_interface(), "not interface");
1250 Klass* volatile* addr = adr_implementor();
1251 assert(addr != NULL, "null addr");
1252 if (addr != NULL) {
1253 Atomic::release_store(addr, k);
1254 }
1255 }
1256
1257 int InstanceKlass::nof_implementors() const {
1258 Klass* k = implementor();
1259 if (k == NULL) {
1260 return 0;
1261 } else if (k != this) {
1262 return 1;
1263 } else {
1264 return 2;
1265 }
1266 }
1267
1268 // The embedded _implementor field can only record one implementor.
1269 // When there are more than one implementors, the _implementor field
1270 // is set to the interface Klass* itself. Following are the possible
1271 // values for the _implementor field:
1272 // NULL - no implementor
1273 // implementor Klass* - one implementor
1274 // self - more than one implementor
1275 //
1276 // The _implementor field only exists for interfaces.
1277 void InstanceKlass::add_implementor(Klass* k) {
1278 if (Universe::is_fully_initialized()) {
1279 assert_lock_strong(Compile_lock);
1280 }
1281 assert(is_interface(), "not interface");
1282 // Filter out my subinterfaces.
1283 // (Note: Interfaces are never on the subklass list.)
1284 if (InstanceKlass::cast(k)->is_interface()) return;
1285
1286 // Filter out subclasses whose supers already implement me.
1287 // (Note: CHA must walk subclasses of direct implementors
1288 // in order to locate indirect implementors.)
1289 Klass* sk = k->super();
1290 if (sk != NULL && InstanceKlass::cast(sk)->implements_interface(this))
1291 // We only need to check one immediate superclass, since the
1292 // implements_interface query looks at transitive_interfaces.
1293 // Any supers of the super have the same (or fewer) transitive_interfaces.
1294 return;
1295
1296 Klass* ik = implementor();
1297 if (ik == NULL) {
1298 set_implementor(k);
1299 } else if (ik != this && ik != k) {
1300 // There is already an implementor. Use itself as an indicator of
1301 // more than one implementors.
1302 set_implementor(this);
1303 }
1304
1305 // The implementor also implements the transitive_interfaces
1306 for (int index = 0; index < local_interfaces()->length(); index++) {
1307 InstanceKlass::cast(local_interfaces()->at(index))->add_implementor(k);
1308 }
1309 }
1310
1311 void InstanceKlass::init_implementor() {
1312 if (is_interface()) {
1313 set_implementor(NULL);
1314 }
1315 }
1316
1317
1318 void InstanceKlass::process_interfaces(Thread *thread) {
1319 // link this class into the implementors list of every interface it implements
1320 for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
1321 assert(local_interfaces()->at(i)->is_klass(), "must be a klass");
1322 InstanceKlass* interf = InstanceKlass::cast(local_interfaces()->at(i));
1323 assert(interf->is_interface(), "expected interface");
1324 interf->add_implementor(this);
1325 }
1326 }
1327
1328 bool InstanceKlass::can_be_primary_super_slow() const {
1329 if (is_interface())
1330 return false;
1331 else
1332 return Klass::can_be_primary_super_slow();
1333 }
1334
1335 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots,
1336 Array<InstanceKlass*>* transitive_interfaces) {
1337 // The secondaries are the implemented interfaces.
1338 Array<InstanceKlass*>* interfaces = transitive_interfaces;
1339 int num_secondaries = num_extra_slots + interfaces->length();
1340 if (num_secondaries == 0) {
1341 // Must share this for correct bootstrapping!
1342 set_secondary_supers(Universe::the_empty_klass_array());
1343 return NULL;
1344 } else if (num_extra_slots == 0) {
1345 // The secondary super list is exactly the same as the transitive interfaces, so
1346 // let's use it instead of making a copy.
1347 // Redefine classes has to be careful not to delete this!
1348 // We need the cast because Array<Klass*> is NOT a supertype of Array<InstanceKlass*>,
1349 // (but it's safe to do here because we won't write into _secondary_supers from this point on).
1350 set_secondary_supers((Array<Klass*>*)(address)interfaces);
1351 return NULL;
1352 } else {
1353 // Copy transitive interfaces to a temporary growable array to be constructed
1354 // into the secondary super list with extra slots.
1355 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length());
1356 for (int i = 0; i < interfaces->length(); i++) {
1357 secondaries->push(interfaces->at(i));
1358 }
1359 return secondaries;
1360 }
1361 }
1362
1363 bool InstanceKlass::implements_interface(Klass* k) const {
1364 if (this == k) return true;
1365 assert(k->is_interface(), "should be an interface class");
1366 for (int i = 0; i < transitive_interfaces()->length(); i++) {
1367 if (transitive_interfaces()->at(i) == k) {
1368 return true;
1369 }
1370 }
1371 return false;
1372 }
1373
1374 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const {
1375 // Verify direct super interface
1376 if (this == k) return true;
1377 assert(k->is_interface(), "should be an interface class");
1378 for (int i = 0; i < local_interfaces()->length(); i++) {
1379 if (local_interfaces()->at(i) == k) {
1380 return true;
1381 }
1382 }
1383 return false;
1384 }
1385
1386 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) {
1387 check_array_allocation_length(length, arrayOopDesc::max_array_length(T_OBJECT), CHECK_NULL);
1388 int size = objArrayOopDesc::object_size(length);
1389 Klass* ak = array_klass(n, CHECK_NULL);
1390 objArrayOop o = (objArrayOop)Universe::heap()->array_allocate(ak, size, length,
1391 /* do_zero */ true, CHECK_NULL);
1392 return o;
1393 }
1394
1395 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
1396 if (TraceFinalizerRegistration) {
1397 tty->print("Registered ");
1398 i->print_value_on(tty);
1399 tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", p2i(i));
1400 }
1401 instanceHandle h_i(THREAD, i);
1402 // Pass the handle as argument, JavaCalls::call expects oop as jobjects
1403 JavaValue result(T_VOID);
1404 JavaCallArguments args(h_i);
1405 methodHandle mh (THREAD, Universe::finalizer_register_method());
1406 JavaCalls::call(&result, mh, &args, CHECK_NULL);
1407 return h_i();
1408 }
1409
1410 instanceOop InstanceKlass::allocate_instance(TRAPS) {
1411 bool has_finalizer_flag = has_finalizer(); // Query before possible GC
1412 int size = size_helper(); // Query before forming handle.
1413
1414 instanceOop i;
1415
1416 i = (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL);
1417 if (has_finalizer_flag && !RegisterFinalizersAtInit) {
1418 i = register_finalizer(i, CHECK_NULL);
1419 }
1420 return i;
1421 }
1422
1423 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) {
1424 return instanceHandle(THREAD, allocate_instance(THREAD));
1425 }
1426
1427 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1428 if (is_interface() || is_abstract()) {
1429 ResourceMark rm(THREAD);
1430 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1431 : vmSymbols::java_lang_InstantiationException(), external_name());
1432 }
1433 if (this == SystemDictionary::Class_klass()) {
1434 ResourceMark rm(THREAD);
1435 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1436 : vmSymbols::java_lang_IllegalAccessException(), external_name());
1437 }
1438 }
1439
1440 Klass* InstanceKlass::array_klass_impl(bool or_null, int n, TRAPS) {
1441 // Need load-acquire for lock-free read
1442 if (array_klasses_acquire() == NULL) {
1443 if (or_null) return NULL;
1444
1445 ResourceMark rm(THREAD);
1446 JavaThread *jt = (JavaThread *)THREAD;
1447 {
1448 // Atomic creation of array_klasses
1449 MutexLocker ma(THREAD, MultiArray_lock);
1450
1451 // Check if update has already taken place
1452 if (array_klasses() == NULL) {
1453 ObjArrayKlass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this, CHECK_NULL);
1454 // use 'release' to pair with lock-free load
1455 release_set_array_klasses(k);
1456 }
1457 }
1458 }
1459 // _this will always be set at this point
1460 ObjArrayKlass* oak = array_klasses();
1461 if (or_null) {
1462 return oak->array_klass_or_null(n);
1463 }
1464 return oak->array_klass(n, THREAD);
1465 }
1466
1467 Klass* InstanceKlass::array_klass_impl(bool or_null, TRAPS) {
1468 return array_klass_impl(or_null, 1, THREAD);
1469 }
1470
1471 static int call_class_initializer_counter = 0; // for debugging
1472
1473 Method* InstanceKlass::class_initializer() const {
1474 Method* clinit = find_method(
1475 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1476 if (clinit != NULL && clinit->has_valid_initializer_flags()) {
1477 return clinit;
1478 }
1479 return NULL;
1480 }
1481
1482 void InstanceKlass::call_class_initializer(TRAPS) {
1483 if (ReplayCompiles &&
1484 (ReplaySuppressInitializers == 1 ||
1485 (ReplaySuppressInitializers >= 2 && class_loader() != NULL))) {
1486 // Hide the existence of the initializer for the purpose of replaying the compile
1487 return;
1488 }
1489
1490 methodHandle h_method(THREAD, class_initializer());
1491 assert(!is_initialized(), "we cannot initialize twice");
1492 LogTarget(Info, class, init) lt;
1493 if (lt.is_enabled()) {
1494 ResourceMark rm(THREAD);
1495 LogStream ls(lt);
1496 ls.print("%d Initializing ", call_class_initializer_counter++);
1497 name()->print_value_on(&ls);
1498 ls.print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", p2i(this));
1499 }
1500 if (h_method() != NULL) {
1501 JavaCallArguments args; // No arguments
1502 JavaValue result(T_VOID);
1503 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1504 }
1505 }
1506
1507
1508 void InstanceKlass::mask_for(const methodHandle& method, int bci,
1509 InterpreterOopMap* entry_for) {
1510 // Lazily create the _oop_map_cache at first request
1511 // Lock-free access requires load_acquire.
1512 OopMapCache* oop_map_cache = Atomic::load_acquire(&_oop_map_cache);
1513 if (oop_map_cache == NULL) {
1514 MutexLocker x(OopMapCacheAlloc_lock);
1515 // Check if _oop_map_cache was allocated while we were waiting for this lock
1516 if ((oop_map_cache = _oop_map_cache) == NULL) {
1517 oop_map_cache = new OopMapCache();
1518 // Ensure _oop_map_cache is stable, since it is examined without a lock
1519 Atomic::release_store(&_oop_map_cache, oop_map_cache);
1520 }
1521 }
1522 // _oop_map_cache is constant after init; lookup below does its own locking.
1523 oop_map_cache->lookup(method, bci, entry_for);
1524 }
1525
1526 bool InstanceKlass::contains_field_offset(int offset) {
1527 fieldDescriptor fd;
1528 return find_field_from_offset(offset, false, &fd);
1529 }
1530
1531 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1532 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1533 Symbol* f_name = fs.name();
1534 Symbol* f_sig = fs.signature();
1535 if (f_name == name && f_sig == sig) {
1536 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1537 return true;
1538 }
1539 }
1540 return false;
1541 }
1542
1543
1544 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1545 const int n = local_interfaces()->length();
1546 for (int i = 0; i < n; i++) {
1547 Klass* intf1 = local_interfaces()->at(i);
1548 assert(intf1->is_interface(), "just checking type");
1549 // search for field in current interface
1550 if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) {
1551 assert(fd->is_static(), "interface field must be static");
1552 return intf1;
1553 }
1554 // search for field in direct superinterfaces
1555 Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd);
1556 if (intf2 != NULL) return intf2;
1557 }
1558 // otherwise field lookup fails
1559 return NULL;
1560 }
1561
1562
1563 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1564 // search order according to newest JVM spec (5.4.3.2, p.167).
1565 // 1) search for field in current klass
1566 if (find_local_field(name, sig, fd)) {
1567 return const_cast<InstanceKlass*>(this);
1568 }
1569 // 2) search for field recursively in direct superinterfaces
1570 { Klass* intf = find_interface_field(name, sig, fd);
1571 if (intf != NULL) return intf;
1572 }
1573 // 3) apply field lookup recursively if superclass exists
1574 { Klass* supr = super();
1575 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, fd);
1576 }
1577 // 4) otherwise field lookup fails
1578 return NULL;
1579 }
1580
1581
1582 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
1583 // search order according to newest JVM spec (5.4.3.2, p.167).
1584 // 1) search for field in current klass
1585 if (find_local_field(name, sig, fd)) {
1586 if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
1587 }
1588 // 2) search for field recursively in direct superinterfaces
1589 if (is_static) {
1590 Klass* intf = find_interface_field(name, sig, fd);
1591 if (intf != NULL) return intf;
1592 }
1593 // 3) apply field lookup recursively if superclass exists
1594 { Klass* supr = super();
1595 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd);
1596 }
1597 // 4) otherwise field lookup fails
1598 return NULL;
1599 }
1600
1601
1602 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1603 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1604 if (fs.offset() == offset) {
1605 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1606 if (fd->is_static() == is_static) return true;
1607 }
1608 }
1609 return false;
1610 }
1611
1612
1613 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1614 Klass* klass = const_cast<InstanceKlass*>(this);
1615 while (klass != NULL) {
1616 if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) {
1617 return true;
1618 }
1619 klass = klass->super();
1620 }
1621 return false;
1622 }
1623
1624
1625 void InstanceKlass::methods_do(void f(Method* method)) {
1626 // Methods aren't stable until they are loaded. This can be read outside
1627 // a lock through the ClassLoaderData for profiling
1628 if (!is_loaded()) {
1629 return;
1630 }
1631
1632 int len = methods()->length();
1633 for (int index = 0; index < len; index++) {
1634 Method* m = methods()->at(index);
1635 assert(m->is_method(), "must be method");
1636 f(m);
1637 }
1638 }
1639
1640
1641 void InstanceKlass::do_local_static_fields(FieldClosure* cl) {
1642 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1643 if (fs.access_flags().is_static()) {
1644 fieldDescriptor& fd = fs.field_descriptor();
1645 cl->do_field(&fd);
1646 }
1647 }
1648 }
1649
1650
1651 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) {
1652 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1653 if (fs.access_flags().is_static()) {
1654 fieldDescriptor& fd = fs.field_descriptor();
1655 f(&fd, mirror, CHECK);
1656 }
1657 }
1658 }
1659
1660
1661 static int compare_fields_by_offset(int* a, int* b) {
1662 return a[0] - b[0];
1663 }
1664
1665 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) {
1666 InstanceKlass* super = superklass();
1667 if (super != NULL) {
1668 super->do_nonstatic_fields(cl);
1669 }
1670 fieldDescriptor fd;
1671 int length = java_fields_count();
1672 // In DebugInfo nonstatic fields are sorted by offset.
1673 int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1), mtClass);
1674 int j = 0;
1675 for (int i = 0; i < length; i += 1) {
1676 fd.reinitialize(this, i);
1677 if (!fd.is_static()) {
1678 fields_sorted[j + 0] = fd.offset();
1679 fields_sorted[j + 1] = i;
1680 j += 2;
1681 }
1682 }
1683 if (j > 0) {
1684 length = j;
1685 // _sort_Fn is defined in growableArray.hpp.
1686 qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset);
1687 for (int i = 0; i < length; i += 2) {
1688 fd.reinitialize(this, fields_sorted[i + 1]);
1689 assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields");
1690 cl->do_field(&fd);
1691 }
1692 }
1693 FREE_C_HEAP_ARRAY(int, fields_sorted);
1694 }
1695
1696
1697 void InstanceKlass::array_klasses_do(void f(Klass* k, TRAPS), TRAPS) {
1698 if (array_klasses() != NULL)
1699 array_klasses()->array_klasses_do(f, THREAD);
1700 }
1701
1702 void InstanceKlass::array_klasses_do(void f(Klass* k)) {
1703 if (array_klasses() != NULL)
1704 array_klasses()->array_klasses_do(f);
1705 }
1706
1707 #ifdef ASSERT
1708 static int linear_search(const Array<Method*>* methods,
1709 const Symbol* name,
1710 const Symbol* signature) {
1711 const int len = methods->length();
1712 for (int index = 0; index < len; index++) {
1713 const Method* const m = methods->at(index);
1714 assert(m->is_method(), "must be method");
1715 if (m->signature() == signature && m->name() == name) {
1716 return index;
1717 }
1718 }
1719 return -1;
1720 }
1721 #endif
1722
1723 bool InstanceKlass::_disable_method_binary_search = false;
1724
1725 NOINLINE int linear_search(const Array<Method*>* methods, const Symbol* name) {
1726 int len = methods->length();
1727 int l = 0;
1728 int h = len - 1;
1729 while (l <= h) {
1730 Method* m = methods->at(l);
1731 if (m->name() == name) {
1732 return l;
1733 }
1734 l++;
1735 }
1736 return -1;
1737 }
1738
1739 inline int InstanceKlass::quick_search(const Array<Method*>* methods, const Symbol* name) {
1740 if (_disable_method_binary_search) {
1741 assert(DynamicDumpSharedSpaces, "must be");
1742 // At the final stage of dynamic dumping, the methods array may not be sorted
1743 // by ascending addresses of their names, so we can't use binary search anymore.
1744 // However, methods with the same name are still laid out consecutively inside the
1745 // methods array, so let's look for the first one that matches.
1746 return linear_search(methods, name);
1747 }
1748
1749 int len = methods->length();
1750 int l = 0;
1751 int h = len - 1;
1752
1753 // methods are sorted by ascending addresses of their names, so do binary search
1754 while (l <= h) {
1755 int mid = (l + h) >> 1;
1756 Method* m = methods->at(mid);
1757 assert(m->is_method(), "must be method");
1758 int res = m->name()->fast_compare(name);
1759 if (res == 0) {
1760 return mid;
1761 } else if (res < 0) {
1762 l = mid + 1;
1763 } else {
1764 h = mid - 1;
1765 }
1766 }
1767 return -1;
1768 }
1769
1770 // find_method looks up the name/signature in the local methods array
1771 Method* InstanceKlass::find_method(const Symbol* name,
1772 const Symbol* signature) const {
1773 return find_method_impl(name, signature,
1774 OverpassLookupMode::find,
1775 StaticLookupMode::find,
1776 PrivateLookupMode::find);
1777 }
1778
1779 Method* InstanceKlass::find_method_impl(const Symbol* name,
1780 const Symbol* signature,
1781 OverpassLookupMode overpass_mode,
1782 StaticLookupMode static_mode,
1783 PrivateLookupMode private_mode) const {
1784 return InstanceKlass::find_method_impl(methods(),
1785 name,
1786 signature,
1787 overpass_mode,
1788 static_mode,
1789 private_mode);
1790 }
1791
1792 // find_instance_method looks up the name/signature in the local methods array
1793 // and skips over static methods
1794 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods,
1795 const Symbol* name,
1796 const Symbol* signature,
1797 PrivateLookupMode private_mode) {
1798 Method* const meth = InstanceKlass::find_method_impl(methods,
1799 name,
1800 signature,
1801 OverpassLookupMode::find,
1802 StaticLookupMode::skip,
1803 private_mode);
1804 assert(((meth == NULL) || !meth->is_static()),
1805 "find_instance_method should have skipped statics");
1806 return meth;
1807 }
1808
1809 // find_instance_method looks up the name/signature in the local methods array
1810 // and skips over static methods
1811 Method* InstanceKlass::find_instance_method(const Symbol* name,
1812 const Symbol* signature,
1813 PrivateLookupMode private_mode) const {
1814 return InstanceKlass::find_instance_method(methods(), name, signature, private_mode);
1815 }
1816
1817 // Find looks up the name/signature in the local methods array
1818 // and filters on the overpass, static and private flags
1819 // This returns the first one found
1820 // note that the local methods array can have up to one overpass, one static
1821 // and one instance (private or not) with the same name/signature
1822 Method* InstanceKlass::find_local_method(const Symbol* name,
1823 const Symbol* signature,
1824 OverpassLookupMode overpass_mode,
1825 StaticLookupMode static_mode,
1826 PrivateLookupMode private_mode) const {
1827 return InstanceKlass::find_method_impl(methods(),
1828 name,
1829 signature,
1830 overpass_mode,
1831 static_mode,
1832 private_mode);
1833 }
1834
1835 // Find looks up the name/signature in the local methods array
1836 // and filters on the overpass, static and private flags
1837 // This returns the first one found
1838 // note that the local methods array can have up to one overpass, one static
1839 // and one instance (private or not) with the same name/signature
1840 Method* InstanceKlass::find_local_method(const Array<Method*>* methods,
1841 const Symbol* name,
1842 const Symbol* signature,
1843 OverpassLookupMode overpass_mode,
1844 StaticLookupMode static_mode,
1845 PrivateLookupMode private_mode) {
1846 return InstanceKlass::find_method_impl(methods,
1847 name,
1848 signature,
1849 overpass_mode,
1850 static_mode,
1851 private_mode);
1852 }
1853
1854 Method* InstanceKlass::find_method(const Array<Method*>* methods,
1855 const Symbol* name,
1856 const Symbol* signature) {
1857 return InstanceKlass::find_method_impl(methods,
1858 name,
1859 signature,
1860 OverpassLookupMode::find,
1861 StaticLookupMode::find,
1862 PrivateLookupMode::find);
1863 }
1864
1865 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods,
1866 const Symbol* name,
1867 const Symbol* signature,
1868 OverpassLookupMode overpass_mode,
1869 StaticLookupMode static_mode,
1870 PrivateLookupMode private_mode) {
1871 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode);
1872 return hit >= 0 ? methods->at(hit): NULL;
1873 }
1874
1875 // true if method matches signature and conforms to skipping_X conditions.
1876 static bool method_matches(const Method* m,
1877 const Symbol* signature,
1878 bool skipping_overpass,
1879 bool skipping_static,
1880 bool skipping_private) {
1881 return ((m->signature() == signature) &&
1882 (!skipping_overpass || !m->is_overpass()) &&
1883 (!skipping_static || !m->is_static()) &&
1884 (!skipping_private || !m->is_private()));
1885 }
1886
1887 // Used directly for default_methods to find the index into the
1888 // default_vtable_indices, and indirectly by find_method
1889 // find_method_index looks in the local methods array to return the index
1890 // of the matching name/signature. If, overpass methods are being ignored,
1891 // the search continues to find a potential non-overpass match. This capability
1892 // is important during method resolution to prefer a static method, for example,
1893 // over an overpass method.
1894 // There is the possibility in any _method's array to have the same name/signature
1895 // for a static method, an overpass method and a local instance method
1896 // To correctly catch a given method, the search criteria may need
1897 // to explicitly skip the other two. For local instance methods, it
1898 // is often necessary to skip private methods
1899 int InstanceKlass::find_method_index(const Array<Method*>* methods,
1900 const Symbol* name,
1901 const Symbol* signature,
1902 OverpassLookupMode overpass_mode,
1903 StaticLookupMode static_mode,
1904 PrivateLookupMode private_mode) {
1905 const bool skipping_overpass = (overpass_mode == OverpassLookupMode::skip);
1906 const bool skipping_static = (static_mode == StaticLookupMode::skip);
1907 const bool skipping_private = (private_mode == PrivateLookupMode::skip);
1908 const int hit = quick_search(methods, name);
1909 if (hit != -1) {
1910 const Method* const m = methods->at(hit);
1911
1912 // Do linear search to find matching signature. First, quick check
1913 // for common case, ignoring overpasses if requested.
1914 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1915 return hit;
1916 }
1917
1918 // search downwards through overloaded methods
1919 int i;
1920 for (i = hit - 1; i >= 0; --i) {
1921 const Method* const m = methods->at(i);
1922 assert(m->is_method(), "must be method");
1923 if (m->name() != name) {
1924 break;
1925 }
1926 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1927 return i;
1928 }
1929 }
1930 // search upwards
1931 for (i = hit + 1; i < methods->length(); ++i) {
1932 const Method* const m = methods->at(i);
1933 assert(m->is_method(), "must be method");
1934 if (m->name() != name) {
1935 break;
1936 }
1937 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1938 return i;
1939 }
1940 }
1941 // not found
1942 #ifdef ASSERT
1943 const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 :
1944 linear_search(methods, name, signature);
1945 assert(-1 == index, "binary search should have found entry %d", index);
1946 #endif
1947 }
1948 return -1;
1949 }
1950
1951 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const {
1952 return find_method_by_name(methods(), name, end);
1953 }
1954
1955 int InstanceKlass::find_method_by_name(const Array<Method*>* methods,
1956 const Symbol* name,
1957 int* end_ptr) {
1958 assert(end_ptr != NULL, "just checking");
1959 int start = quick_search(methods, name);
1960 int end = start + 1;
1961 if (start != -1) {
1962 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
1963 while (end < methods->length() && (methods->at(end))->name() == name) ++end;
1964 *end_ptr = end;
1965 return start;
1966 }
1967 return -1;
1968 }
1969
1970 // uncached_lookup_method searches both the local class methods array and all
1971 // superclasses methods arrays, skipping any overpass methods in superclasses,
1972 // and possibly skipping private methods.
1973 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
1974 const Symbol* signature,
1975 OverpassLookupMode overpass_mode,
1976 PrivateLookupMode private_mode) const {
1977 OverpassLookupMode overpass_local_mode = overpass_mode;
1978 const Klass* klass = this;
1979 while (klass != NULL) {
1980 Method* const method = InstanceKlass::cast(klass)->find_method_impl(name,
1981 signature,
1982 overpass_local_mode,
1983 StaticLookupMode::find,
1984 private_mode);
1985 if (method != NULL) {
1986 return method;
1987 }
1988 klass = klass->super();
1989 overpass_local_mode = OverpassLookupMode::skip; // Always ignore overpass methods in superclasses
1990 }
1991 return NULL;
1992 }
1993
1994 #ifdef ASSERT
1995 // search through class hierarchy and return true if this class or
1996 // one of the superclasses was redefined
1997 bool InstanceKlass::has_redefined_this_or_super() const {
1998 const Klass* klass = this;
1999 while (klass != NULL) {
2000 if (InstanceKlass::cast(klass)->has_been_redefined()) {
2001 return true;
2002 }
2003 klass = klass->super();
2004 }
2005 return false;
2006 }
2007 #endif
2008
2009 // lookup a method in the default methods list then in all transitive interfaces
2010 // Do NOT return private or static methods
2011 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
2012 Symbol* signature) const {
2013 Method* m = NULL;
2014 if (default_methods() != NULL) {
2015 m = find_method(default_methods(), name, signature);
2016 }
2017 // Look up interfaces
2018 if (m == NULL) {
2019 m = lookup_method_in_all_interfaces(name, signature, DefaultsLookupMode::find);
2020 }
2021 return m;
2022 }
2023
2024 // lookup a method in all the interfaces that this class implements
2025 // Do NOT return private or static methods, new in JDK8 which are not externally visible
2026 // They should only be found in the initial InterfaceMethodRef
2027 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
2028 Symbol* signature,
2029 DefaultsLookupMode defaults_mode) const {
2030 Array<InstanceKlass*>* all_ifs = transitive_interfaces();
2031 int num_ifs = all_ifs->length();
2032 InstanceKlass *ik = NULL;
2033 for (int i = 0; i < num_ifs; i++) {
2034 ik = all_ifs->at(i);
2035 Method* m = ik->lookup_method(name, signature);
2036 if (m != NULL && m->is_public() && !m->is_static() &&
2037 ((defaults_mode != DefaultsLookupMode::skip) || !m->is_default_method())) {
2038 return m;
2039 }
2040 }
2041 return NULL;
2042 }
2043
2044 /* jni_id_for_impl for jfieldIds only */
2045 JNIid* InstanceKlass::jni_id_for_impl(int offset) {
2046 MutexLocker ml(JfieldIdCreation_lock);
2047 // Retry lookup after we got the lock
2048 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
2049 if (probe == NULL) {
2050 // Slow case, allocate new static field identifier
2051 probe = new JNIid(this, offset, jni_ids());
2052 set_jni_ids(probe);
2053 }
2054 return probe;
2055 }
2056
2057
2058 /* jni_id_for for jfieldIds only */
2059 JNIid* InstanceKlass::jni_id_for(int offset) {
2060 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
2061 if (probe == NULL) {
2062 probe = jni_id_for_impl(offset);
2063 }
2064 return probe;
2065 }
2066
2067 u2 InstanceKlass::enclosing_method_data(int offset) const {
2068 const Array<jushort>* const inner_class_list = inner_classes();
2069 if (inner_class_list == NULL) {
2070 return 0;
2071 }
2072 const int length = inner_class_list->length();
2073 if (length % inner_class_next_offset == 0) {
2074 return 0;
2075 }
2076 const int index = length - enclosing_method_attribute_size;
2077 assert(offset < enclosing_method_attribute_size, "invalid offset");
2078 return inner_class_list->at(index + offset);
2079 }
2080
2081 void InstanceKlass::set_enclosing_method_indices(u2 class_index,
2082 u2 method_index) {
2083 Array<jushort>* inner_class_list = inner_classes();
2084 assert (inner_class_list != NULL, "_inner_classes list is not set up");
2085 int length = inner_class_list->length();
2086 if (length % inner_class_next_offset == enclosing_method_attribute_size) {
2087 int index = length - enclosing_method_attribute_size;
2088 inner_class_list->at_put(
2089 index + enclosing_method_class_index_offset, class_index);
2090 inner_class_list->at_put(
2091 index + enclosing_method_method_index_offset, method_index);
2092 }
2093 }
2094
2095 // Lookup or create a jmethodID.
2096 // This code is called by the VMThread and JavaThreads so the
2097 // locking has to be done very carefully to avoid deadlocks
2098 // and/or other cache consistency problems.
2099 //
2100 jmethodID InstanceKlass::get_jmethod_id(const methodHandle& method_h) {
2101 size_t idnum = (size_t)method_h->method_idnum();
2102 jmethodID* jmeths = methods_jmethod_ids_acquire();
2103 size_t length = 0;
2104 jmethodID id = NULL;
2105
2106 // We use a double-check locking idiom here because this cache is
2107 // performance sensitive. In the normal system, this cache only
2108 // transitions from NULL to non-NULL which is safe because we use
2109 // release_set_methods_jmethod_ids() to advertise the new cache.
2110 // A partially constructed cache should never be seen by a racing
2111 // thread. We also use release_store() to save a new jmethodID
2112 // in the cache so a partially constructed jmethodID should never be
2113 // seen either. Cache reads of existing jmethodIDs proceed without a
2114 // lock, but cache writes of a new jmethodID requires uniqueness and
2115 // creation of the cache itself requires no leaks so a lock is
2116 // generally acquired in those two cases.
2117 //
2118 // If the RedefineClasses() API has been used, then this cache can
2119 // grow and we'll have transitions from non-NULL to bigger non-NULL.
2120 // Cache creation requires no leaks and we require safety between all
2121 // cache accesses and freeing of the old cache so a lock is generally
2122 // acquired when the RedefineClasses() API has been used.
2123
2124 if (jmeths != NULL) {
2125 // the cache already exists
2126 if (!idnum_can_increment()) {
2127 // the cache can't grow so we can just get the current values
2128 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2129 } else {
2130 // cache can grow so we have to be more careful
2131 if (Threads::number_of_threads() == 0 ||
2132 SafepointSynchronize::is_at_safepoint()) {
2133 // we're single threaded or at a safepoint - no locking needed
2134 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2135 } else {
2136 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2137 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2138 }
2139 }
2140 }
2141 // implied else:
2142 // we need to allocate a cache so default length and id values are good
2143
2144 if (jmeths == NULL || // no cache yet
2145 length <= idnum || // cache is too short
2146 id == NULL) { // cache doesn't contain entry
2147
2148 // This function can be called by the VMThread so we have to do all
2149 // things that might block on a safepoint before grabbing the lock.
2150 // Otherwise, we can deadlock with the VMThread or have a cache
2151 // consistency issue. These vars keep track of what we might have
2152 // to free after the lock is dropped.
2153 jmethodID to_dealloc_id = NULL;
2154 jmethodID* to_dealloc_jmeths = NULL;
2155
2156 // may not allocate new_jmeths or use it if we allocate it
2157 jmethodID* new_jmeths = NULL;
2158 if (length <= idnum) {
2159 // allocate a new cache that might be used
2160 size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count());
2161 new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1, mtClass);
2162 memset(new_jmeths, 0, (size+1)*sizeof(jmethodID));
2163 // cache size is stored in element[0], other elements offset by one
2164 new_jmeths[0] = (jmethodID)size;
2165 }
2166
2167 // allocate a new jmethodID that might be used
2168 jmethodID new_id = NULL;
2169 if (method_h->is_old() && !method_h->is_obsolete()) {
2170 // The method passed in is old (but not obsolete), we need to use the current version
2171 Method* current_method = method_with_idnum((int)idnum);
2172 assert(current_method != NULL, "old and but not obsolete, so should exist");
2173 new_id = Method::make_jmethod_id(class_loader_data(), current_method);
2174 } else {
2175 // It is the current version of the method or an obsolete method,
2176 // use the version passed in
2177 new_id = Method::make_jmethod_id(class_loader_data(), method_h());
2178 }
2179
2180 if (Threads::number_of_threads() == 0 ||
2181 SafepointSynchronize::is_at_safepoint()) {
2182 // we're single threaded or at a safepoint - no locking needed
2183 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2184 &to_dealloc_id, &to_dealloc_jmeths);
2185 } else {
2186 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2187 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2188 &to_dealloc_id, &to_dealloc_jmeths);
2189 }
2190
2191 // The lock has been dropped so we can free resources.
2192 // Free up either the old cache or the new cache if we allocated one.
2193 if (to_dealloc_jmeths != NULL) {
2194 FreeHeap(to_dealloc_jmeths);
2195 }
2196 // free up the new ID since it wasn't needed
2197 if (to_dealloc_id != NULL) {
2198 Method::destroy_jmethod_id(class_loader_data(), to_dealloc_id);
2199 }
2200 }
2201 return id;
2202 }
2203
2204 // Figure out how many jmethodIDs haven't been allocated, and make
2205 // sure space for them is pre-allocated. This makes getting all
2206 // method ids much, much faster with classes with more than 8
2207 // methods, and has a *substantial* effect on performance with jvmti
2208 // code that loads all jmethodIDs for all classes.
2209 void InstanceKlass::ensure_space_for_methodids(int start_offset) {
2210 int new_jmeths = 0;
2211 int length = methods()->length();
2212 for (int index = start_offset; index < length; index++) {
2213 Method* m = methods()->at(index);
2214 jmethodID id = m->find_jmethod_id_or_null();
2215 if (id == NULL) {
2216 new_jmeths++;
2217 }
2218 }
2219 if (new_jmeths != 0) {
2220 Method::ensure_jmethod_ids(class_loader_data(), new_jmeths);
2221 }
2222 }
2223
2224 // Common code to fetch the jmethodID from the cache or update the
2225 // cache with the new jmethodID. This function should never do anything
2226 // that causes the caller to go to a safepoint or we can deadlock with
2227 // the VMThread or have cache consistency issues.
2228 //
2229 jmethodID InstanceKlass::get_jmethod_id_fetch_or_update(
2230 size_t idnum, jmethodID new_id,
2231 jmethodID* new_jmeths, jmethodID* to_dealloc_id_p,
2232 jmethodID** to_dealloc_jmeths_p) {
2233 assert(new_id != NULL, "sanity check");
2234 assert(to_dealloc_id_p != NULL, "sanity check");
2235 assert(to_dealloc_jmeths_p != NULL, "sanity check");
2236 assert(Threads::number_of_threads() == 0 ||
2237 SafepointSynchronize::is_at_safepoint() ||
2238 JmethodIdCreation_lock->owned_by_self(), "sanity check");
2239
2240 // reacquire the cache - we are locked, single threaded or at a safepoint
2241 jmethodID* jmeths = methods_jmethod_ids_acquire();
2242 jmethodID id = NULL;
2243 size_t length = 0;
2244
2245 if (jmeths == NULL || // no cache yet
2246 (length = (size_t)jmeths[0]) <= idnum) { // cache is too short
2247 if (jmeths != NULL) {
2248 // copy any existing entries from the old cache
2249 for (size_t index = 0; index < length; index++) {
2250 new_jmeths[index+1] = jmeths[index+1];
2251 }
2252 *to_dealloc_jmeths_p = jmeths; // save old cache for later delete
2253 }
2254 release_set_methods_jmethod_ids(jmeths = new_jmeths);
2255 } else {
2256 // fetch jmethodID (if any) from the existing cache
2257 id = jmeths[idnum+1];
2258 *to_dealloc_jmeths_p = new_jmeths; // save new cache for later delete
2259 }
2260 if (id == NULL) {
2261 // No matching jmethodID in the existing cache or we have a new
2262 // cache or we just grew the cache. This cache write is done here
2263 // by the first thread to win the foot race because a jmethodID
2264 // needs to be unique once it is generally available.
2265 id = new_id;
2266
2267 // The jmethodID cache can be read while unlocked so we have to
2268 // make sure the new jmethodID is complete before installing it
2269 // in the cache.
2270 Atomic::release_store(&jmeths[idnum+1], id);
2271 } else {
2272 *to_dealloc_id_p = new_id; // save new id for later delete
2273 }
2274 return id;
2275 }
2276
2277
2278 // Common code to get the jmethodID cache length and the jmethodID
2279 // value at index idnum if there is one.
2280 //
2281 void InstanceKlass::get_jmethod_id_length_value(jmethodID* cache,
2282 size_t idnum, size_t *length_p, jmethodID* id_p) {
2283 assert(cache != NULL, "sanity check");
2284 assert(length_p != NULL, "sanity check");
2285 assert(id_p != NULL, "sanity check");
2286
2287 // cache size is stored in element[0], other elements offset by one
2288 *length_p = (size_t)cache[0];
2289 if (*length_p <= idnum) { // cache is too short
2290 *id_p = NULL;
2291 } else {
2292 *id_p = cache[idnum+1]; // fetch jmethodID (if any)
2293 }
2294 }
2295
2296
2297 // Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles
2298 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
2299 size_t idnum = (size_t)method->method_idnum();
2300 jmethodID* jmeths = methods_jmethod_ids_acquire();
2301 size_t length; // length assigned as debugging crumb
2302 jmethodID id = NULL;
2303 if (jmeths != NULL && // If there is a cache
2304 (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough,
2305 id = jmeths[idnum+1]; // Look up the id (may be NULL)
2306 }
2307 return id;
2308 }
2309
2310 inline DependencyContext InstanceKlass::dependencies() {
2311 DependencyContext dep_context(&_dep_context, &_dep_context_last_cleaned);
2312 return dep_context;
2313 }
2314
2315 int InstanceKlass::mark_dependent_nmethods(KlassDepChange& changes) {
2316 return dependencies().mark_dependent_nmethods(changes);
2317 }
2318
2319 void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
2320 dependencies().add_dependent_nmethod(nm);
2321 }
2322
2323 void InstanceKlass::remove_dependent_nmethod(nmethod* nm) {
2324 dependencies().remove_dependent_nmethod(nm);
2325 }
2326
2327 void InstanceKlass::clean_dependency_context() {
2328 dependencies().clean_unloading_dependents();
2329 }
2330
2331 #ifndef PRODUCT
2332 void InstanceKlass::print_dependent_nmethods(bool verbose) {
2333 dependencies().print_dependent_nmethods(verbose);
2334 }
2335
2336 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
2337 return dependencies().is_dependent_nmethod(nm);
2338 }
2339 #endif //PRODUCT
2340
2341 void InstanceKlass::clean_weak_instanceklass_links() {
2342 clean_implementors_list();
2343 clean_method_data();
2344 }
2345
2346 void InstanceKlass::clean_implementors_list() {
2347 assert(is_loader_alive(), "this klass should be live");
2348 if (is_interface()) {
2349 assert (ClassUnloading, "only called for ClassUnloading");
2350 for (;;) {
2351 // Use load_acquire due to competing with inserts
2352 Klass* impl = Atomic::load_acquire(adr_implementor());
2353 if (impl != NULL && !impl->is_loader_alive()) {
2354 // NULL this field, might be an unloaded klass or NULL
2355 Klass* volatile* klass = adr_implementor();
2356 if (Atomic::cmpxchg(klass, impl, (Klass*)NULL) == impl) {
2357 // Successfully unlinking implementor.
2358 if (log_is_enabled(Trace, class, unload)) {
2359 ResourceMark rm;
2360 log_trace(class, unload)("unlinking class (implementor): %s", impl->external_name());
2361 }
2362 return;
2363 }
2364 } else {
2365 return;
2366 }
2367 }
2368 }
2369 }
2370
2371 void InstanceKlass::clean_method_data() {
2372 for (int m = 0; m < methods()->length(); m++) {
2373 MethodData* mdo = methods()->at(m)->method_data();
2374 if (mdo != NULL) {
2375 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : mdo->extra_data_lock());
2376 mdo->clean_method_data(/*always_clean*/false);
2377 }
2378 }
2379 }
2380
2381 bool InstanceKlass::supers_have_passed_fingerprint_checks() {
2382 if (java_super() != NULL && !java_super()->has_passed_fingerprint_check()) {
2383 ResourceMark rm;
2384 log_trace(class, fingerprint)("%s : super %s not fingerprinted", external_name(), java_super()->external_name());
2385 return false;
2386 }
2387
2388 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
2389 if (local_interfaces != NULL) {
2390 int length = local_interfaces->length();
2391 for (int i = 0; i < length; i++) {
2392 InstanceKlass* intf = local_interfaces->at(i);
2393 if (!intf->has_passed_fingerprint_check()) {
2394 ResourceMark rm;
2395 log_trace(class, fingerprint)("%s : interface %s not fingerprinted", external_name(), intf->external_name());
2396 return false;
2397 }
2398 }
2399 }
2400
2401 return true;
2402 }
2403
2404 bool InstanceKlass::should_store_fingerprint(bool is_hidden_or_anonymous) {
2405 #if INCLUDE_AOT
2406 // We store the fingerprint into the InstanceKlass only in the following 2 cases:
2407 if (CalculateClassFingerprint) {
2408 // (1) We are running AOT to generate a shared library.
2409 return true;
2410 }
2411 if (Arguments::is_dumping_archive()) {
2412 // (2) We are running -Xshare:dump or -XX:ArchiveClassesAtExit to create a shared archive
2413 return true;
2414 }
2415 if (UseAOT && is_hidden_or_anonymous) {
2416 // (3) We are using AOT code from a shared library and see a hidden or unsafe anonymous class
2417 return true;
2418 }
2419 #endif
2420
2421 // In all other cases we might set the _misc_has_passed_fingerprint_check bit,
2422 // but do not store the 64-bit fingerprint to save space.
2423 return false;
2424 }
2425
2426 bool InstanceKlass::has_stored_fingerprint() const {
2427 #if INCLUDE_AOT
2428 return should_store_fingerprint() || is_shared();
2429 #else
2430 return false;
2431 #endif
2432 }
2433
2434 uint64_t InstanceKlass::get_stored_fingerprint() const {
2435 address adr = adr_fingerprint();
2436 if (adr != NULL) {
2437 return (uint64_t)Bytes::get_native_u8(adr); // adr may not be 64-bit aligned
2438 }
2439 return 0;
2440 }
2441
2442 void InstanceKlass::store_fingerprint(uint64_t fingerprint) {
2443 address adr = adr_fingerprint();
2444 if (adr != NULL) {
2445 Bytes::put_native_u8(adr, (u8)fingerprint); // adr may not be 64-bit aligned
2446
2447 ResourceMark rm;
2448 log_trace(class, fingerprint)("stored as " PTR64_FORMAT " for class %s", fingerprint, external_name());
2449 }
2450 }
2451
2452 void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) {
2453 Klass::metaspace_pointers_do(it);
2454
2455 if (log_is_enabled(Trace, cds)) {
2456 ResourceMark rm;
2457 log_trace(cds)("Iter(InstanceKlass): %p (%s)", this, external_name());
2458 }
2459
2460 it->push(&_annotations);
2461 it->push((Klass**)&_array_klasses);
2462 it->push(&_constants);
2463 it->push(&_inner_classes);
2464 #if INCLUDE_JVMTI
2465 it->push(&_previous_versions);
2466 #endif
2467 it->push(&_methods);
2468 it->push(&_default_methods);
2469 it->push(&_local_interfaces);
2470 it->push(&_transitive_interfaces);
2471 it->push(&_method_ordering);
2472 it->push(&_default_vtable_indices);
2473 it->push(&_fields);
2474
2475 if (itable_length() > 0) {
2476 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2477 int method_table_offset_in_words = ioe->offset()/wordSize;
2478 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
2479 / itableOffsetEntry::size();
2480
2481 for (int i = 0; i < nof_interfaces; i ++, ioe ++) {
2482 if (ioe->interface_klass() != NULL) {
2483 it->push(ioe->interface_klass_addr());
2484 itableMethodEntry* ime = ioe->first_method_entry(this);
2485 int n = klassItable::method_count_for_interface(ioe->interface_klass());
2486 for (int index = 0; index < n; index ++) {
2487 it->push(ime[index].method_addr());
2488 }
2489 }
2490 }
2491 }
2492
2493 it->push(&_nest_members);
2494 it->push(&_permitted_subclasses);
2495 it->push(&_record_components);
2496 }
2497
2498 void InstanceKlass::remove_unshareable_info() {
2499 Klass::remove_unshareable_info();
2500
2501 if (SystemDictionaryShared::has_class_failed_verification(this)) {
2502 // Classes are attempted to link during dumping and may fail,
2503 // but these classes are still in the dictionary and class list in CLD.
2504 // If the class has failed verification, there is nothing else to remove.
2505 return;
2506 }
2507
2508 // Reset to the 'allocated' state to prevent any premature accessing to
2509 // a shared class at runtime while the class is still being loaded and
2510 // restored. A class' init_state is set to 'loaded' at runtime when it's
2511 // being added to class hierarchy (see SystemDictionary:::add_to_hierarchy()).
2512 _init_state = allocated;
2513
2514 { // Otherwise this needs to take out the Compile_lock.
2515 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
2516 init_implementor();
2517 }
2518
2519 constants()->remove_unshareable_info();
2520
2521 for (int i = 0; i < methods()->length(); i++) {
2522 Method* m = methods()->at(i);
2523 m->remove_unshareable_info();
2524 }
2525
2526 // do array classes also.
2527 if (array_klasses() != NULL) {
2528 array_klasses()->remove_unshareable_info();
2529 }
2530
2531 // These are not allocated from metaspace. They are safe to set to NULL.
2532 _source_debug_extension = NULL;
2533 _dep_context = NULL;
2534 _osr_nmethods_head = NULL;
2535 #if INCLUDE_JVMTI
2536 _breakpoints = NULL;
2537 _previous_versions = NULL;
2538 _cached_class_file = NULL;
2539 _jvmti_cached_class_field_map = NULL;
2540 #endif
2541
2542 _init_thread = NULL;
2543 _methods_jmethod_ids = NULL;
2544 _jni_ids = NULL;
2545 _oop_map_cache = NULL;
2546 // clear _nest_host to ensure re-load at runtime
2547 _nest_host = NULL;
2548 _package_entry = NULL;
2549 _dep_context_last_cleaned = 0;
2550 }
2551
2552 void InstanceKlass::remove_java_mirror() {
2553 Klass::remove_java_mirror();
2554
2555 // do array classes also.
2556 if (array_klasses() != NULL) {
2557 array_klasses()->remove_java_mirror();
2558 }
2559 }
2560
2561 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain,
2562 PackageEntry* pkg_entry, TRAPS) {
2563 // SystemDictionary::add_to_hierarchy() sets the init_state to loaded
2564 // before the InstanceKlass is added to the SystemDictionary. Make
2565 // sure the current state is <loaded.
2566 assert(!is_loaded(), "invalid init state");
2567 set_package(loader_data, pkg_entry, CHECK);
2568 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
2569
2570 Array<Method*>* methods = this->methods();
2571 int num_methods = methods->length();
2572 for (int index = 0; index < num_methods; ++index) {
2573 methods->at(index)->restore_unshareable_info(CHECK);
2574 }
2575 if (JvmtiExport::has_redefined_a_class()) {
2576 // Reinitialize vtable because RedefineClasses may have changed some
2577 // entries in this vtable for super classes so the CDS vtable might
2578 // point to old or obsolete entries. RedefineClasses doesn't fix up
2579 // vtables in the shared system dictionary, only the main one.
2580 // It also redefines the itable too so fix that too.
2581 vtable().initialize_vtable(false, CHECK);
2582 itable().initialize_itable(false, CHECK);
2583 }
2584
2585 // restore constant pool resolved references
2586 constants()->restore_unshareable_info(CHECK);
2587
2588 if (array_klasses() != NULL) {
2589 // Array classes have null protection domain.
2590 // --> see ArrayKlass::complete_create_array_klass()
2591 array_klasses()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
2592 }
2593
2594 // Initialize current biased locking state.
2595 if (UseBiasedLocking && BiasedLocking::enabled()) {
2596 set_prototype_header(markWord::biased_locking_prototype());
2597 }
2598 }
2599
2600 void InstanceKlass::set_shared_class_loader_type(s2 loader_type) {
2601 switch (loader_type) {
2602 case ClassLoader::BOOT_LOADER:
2603 _misc_flags |= _misc_is_shared_boot_class;
2604 break;
2605 case ClassLoader::PLATFORM_LOADER:
2606 _misc_flags |= _misc_is_shared_platform_class;
2607 break;
2608 case ClassLoader::APP_LOADER:
2609 _misc_flags |= _misc_is_shared_app_class;
2610 break;
2611 default:
2612 ShouldNotReachHere();
2613 break;
2614 }
2615 }
2616
2617 void InstanceKlass::assign_class_loader_type() {
2618 ClassLoaderData *cld = class_loader_data();
2619 if (cld->is_boot_class_loader_data()) {
2620 set_shared_class_loader_type(ClassLoader::BOOT_LOADER);
2621 }
2622 else if (cld->is_platform_class_loader_data()) {
2623 set_shared_class_loader_type(ClassLoader::PLATFORM_LOADER);
2624 }
2625 else if (cld->is_system_class_loader_data()) {
2626 set_shared_class_loader_type(ClassLoader::APP_LOADER);
2627 }
2628 }
2629
2630 #if INCLUDE_JVMTI
2631 static void clear_all_breakpoints(Method* m) {
2632 m->clear_all_breakpoints();
2633 }
2634 #endif
2635
2636 void InstanceKlass::unload_class(InstanceKlass* ik) {
2637 // Release dependencies.
2638 ik->dependencies().remove_all_dependents();
2639
2640 // notify the debugger
2641 if (JvmtiExport::should_post_class_unload()) {
2642 JvmtiExport::post_class_unload(ik);
2643 }
2644
2645 // notify ClassLoadingService of class unload
2646 ClassLoadingService::notify_class_unloaded(ik);
2647
2648 if (Arguments::is_dumping_archive()) {
2649 SystemDictionaryShared::remove_dumptime_info(ik);
2650 }
2651
2652 if (log_is_enabled(Info, class, unload)) {
2653 ResourceMark rm;
2654 log_info(class, unload)("unloading class %s " INTPTR_FORMAT, ik->external_name(), p2i(ik));
2655 }
2656
2657 Events::log_class_unloading(Thread::current(), ik);
2658
2659 #if INCLUDE_JFR
2660 assert(ik != NULL, "invariant");
2661 EventClassUnload event;
2662 event.set_unloadedClass(ik);
2663 event.set_definingClassLoader(ik->class_loader_data());
2664 event.commit();
2665 #endif
2666 }
2667
2668 static void method_release_C_heap_structures(Method* m) {
2669 m->release_C_heap_structures();
2670 }
2671
2672 void InstanceKlass::release_C_heap_structures() {
2673
2674 // Clean up C heap
2675 release_C_heap_structures_internal();
2676 constants()->release_C_heap_structures();
2677
2678 // Deallocate and call destructors for MDO mutexes
2679 methods_do(method_release_C_heap_structures);
2680 }
2681
2682 void InstanceKlass::release_C_heap_structures_internal() {
2683 Klass::release_C_heap_structures();
2684
2685 // Can't release the constant pool here because the constant pool can be
2686 // deallocated separately from the InstanceKlass for default methods and
2687 // redefine classes.
2688
2689 // Deallocate oop map cache
2690 if (_oop_map_cache != NULL) {
2691 delete _oop_map_cache;
2692 _oop_map_cache = NULL;
2693 }
2694
2695 // Deallocate JNI identifiers for jfieldIDs
2696 JNIid::deallocate(jni_ids());
2697 set_jni_ids(NULL);
2698
2699 jmethodID* jmeths = methods_jmethod_ids_acquire();
2700 if (jmeths != (jmethodID*)NULL) {
2701 release_set_methods_jmethod_ids(NULL);
2702 FreeHeap(jmeths);
2703 }
2704
2705 assert(_dep_context == NULL,
2706 "dependencies should already be cleaned");
2707
2708 #if INCLUDE_JVMTI
2709 // Deallocate breakpoint records
2710 if (breakpoints() != 0x0) {
2711 methods_do(clear_all_breakpoints);
2712 assert(breakpoints() == 0x0, "should have cleared breakpoints");
2713 }
2714
2715 // deallocate the cached class file
2716 if (_cached_class_file != NULL) {
2717 os::free(_cached_class_file);
2718 _cached_class_file = NULL;
2719 }
2720 #endif
2721
2722 FREE_C_HEAP_ARRAY(char, _source_debug_extension);
2723 }
2724
2725 void InstanceKlass::set_source_debug_extension(const char* array, int length) {
2726 if (array == NULL) {
2727 _source_debug_extension = NULL;
2728 } else {
2729 // Adding one to the attribute length in order to store a null terminator
2730 // character could cause an overflow because the attribute length is
2731 // already coded with an u4 in the classfile, but in practice, it's
2732 // unlikely to happen.
2733 assert((length+1) > length, "Overflow checking");
2734 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
2735 for (int i = 0; i < length; i++) {
2736 sde[i] = array[i];
2737 }
2738 sde[length] = '\0';
2739 _source_debug_extension = sde;
2740 }
2741 }
2742
2743 const char* InstanceKlass::signature_name() const {
2744 int hash_len = 0;
2745 char hash_buf[40];
2746
2747 // If this is an unsafe anonymous class, append a hash to make the name unique
2748 if (is_unsafe_anonymous()) {
2749 intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0;
2750 jio_snprintf(hash_buf, sizeof(hash_buf), "/" UINTX_FORMAT, (uintx)hash);
2751 hash_len = (int)strlen(hash_buf);
2752 }
2753
2754 // Get the internal name as a c string
2755 const char* src = (const char*) (name()->as_C_string());
2756 const int src_length = (int)strlen(src);
2757
2758 char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3);
2759
2760 // Add L as type indicator
2761 int dest_index = 0;
2762 dest[dest_index++] = JVM_SIGNATURE_CLASS;
2763
2764 // Add the actual class name
2765 for (int src_index = 0; src_index < src_length; ) {
2766 dest[dest_index++] = src[src_index++];
2767 }
2768
2769 if (is_hidden()) { // Replace the last '+' with a '.'.
2770 for (int index = (int)src_length; index > 0; index--) {
2771 if (dest[index] == '+') {
2772 dest[index] = JVM_SIGNATURE_DOT;
2773 break;
2774 }
2775 }
2776 }
2777
2778 // If we have a hash, append it
2779 for (int hash_index = 0; hash_index < hash_len; ) {
2780 dest[dest_index++] = hash_buf[hash_index++];
2781 }
2782
2783 // Add the semicolon and the NULL
2784 dest[dest_index++] = JVM_SIGNATURE_ENDCLASS;
2785 dest[dest_index] = '\0';
2786 return dest;
2787 }
2788
2789 ModuleEntry* InstanceKlass::module() const {
2790 // For an unsafe anonymous class return the host class' module
2791 if (is_unsafe_anonymous()) {
2792 assert(unsafe_anonymous_host() != NULL, "unsafe anonymous class must have a host class");
2793 return unsafe_anonymous_host()->module();
2794 }
2795
2796 if (is_hidden() &&
2797 in_unnamed_package() &&
2798 class_loader_data()->has_class_mirror_holder()) {
2799 // For a non-strong hidden class defined to an unnamed package,
2800 // its (class held) CLD will not have an unnamed module created for it.
2801 // Two choices to find the correct ModuleEntry:
2802 // 1. If hidden class is within a nest, use nest host's module
2803 // 2. Find the unnamed module off from the class loader
2804 // For now option #2 is used since a nest host is not set until
2805 // after the instance class is created in jvm_lookup_define_class().
2806 if (class_loader_data()->is_boot_class_loader_data()) {
2807 return ClassLoaderData::the_null_class_loader_data()->unnamed_module();
2808 } else {
2809 oop module = java_lang_ClassLoader::unnamedModule(class_loader_data()->class_loader());
2810 assert(java_lang_Module::is_instance(module), "Not an instance of java.lang.Module");
2811 return java_lang_Module::module_entry(module);
2812 }
2813 }
2814
2815 // Class is in a named package
2816 if (!in_unnamed_package()) {
2817 return _package_entry->module();
2818 }
2819
2820 // Class is in an unnamed package, return its loader's unnamed module
2821 return class_loader_data()->unnamed_module();
2822 }
2823
2824 void InstanceKlass::set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS) {
2825
2826 // ensure java/ packages only loaded by boot or platform builtin loaders
2827 // not needed for shared class since CDS does not archive prohibited classes.
2828 if (!is_shared()) {
2829 check_prohibited_package(name(), loader_data, CHECK);
2830 }
2831
2832 // ClassLoader::package_from_class_name has already incremented the refcount of the symbol
2833 // it returns, so we need to decrement it when the current function exits.
2834 TempNewSymbol from_class_name =
2835 (pkg_entry != NULL) ? NULL : ClassLoader::package_from_class_name(name());
2836
2837 Symbol* pkg_name;
2838 if (pkg_entry != NULL) {
2839 pkg_name = pkg_entry->name();
2840 } else {
2841 pkg_name = from_class_name;
2842 }
2843
2844 if (pkg_name != NULL && loader_data != NULL) {
2845
2846 // Find in class loader's package entry table.
2847 _package_entry = pkg_entry != NULL ? pkg_entry : loader_data->packages()->lookup_only(pkg_name);
2848
2849 // If the package name is not found in the loader's package
2850 // entry table, it is an indication that the package has not
2851 // been defined. Consider it defined within the unnamed module.
2852 if (_package_entry == NULL) {
2853
2854 if (!ModuleEntryTable::javabase_defined()) {
2855 // Before java.base is defined during bootstrapping, define all packages in
2856 // the java.base module. If a non-java.base package is erroneously placed
2857 // in the java.base module it will be caught later when java.base
2858 // is defined by ModuleEntryTable::verify_javabase_packages check.
2859 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, JAVA_BASE_NAME " module is NULL");
2860 _package_entry = loader_data->packages()->lookup(pkg_name, ModuleEntryTable::javabase_moduleEntry());
2861 } else {
2862 assert(loader_data->unnamed_module() != NULL, "unnamed module is NULL");
2863 _package_entry = loader_data->packages()->lookup(pkg_name,
2864 loader_data->unnamed_module());
2865 }
2866
2867 // A package should have been successfully created
2868 DEBUG_ONLY(ResourceMark rm(THREAD));
2869 assert(_package_entry != NULL, "Package entry for class %s not found, loader %s",
2870 name()->as_C_string(), loader_data->loader_name_and_id());
2871 }
2872
2873 if (log_is_enabled(Debug, module)) {
2874 ResourceMark rm(THREAD);
2875 ModuleEntry* m = _package_entry->module();
2876 log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s",
2877 external_name(),
2878 pkg_name->as_C_string(),
2879 loader_data->loader_name_and_id(),
2880 (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE));
2881 }
2882 } else {
2883 ResourceMark rm(THREAD);
2884 log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s",
2885 external_name(),
2886 (loader_data != NULL) ? loader_data->loader_name_and_id() : "NULL",
2887 UNNAMED_MODULE);
2888 }
2889 }
2890
2891 // Function set_classpath_index checks if the package of the InstanceKlass is in the
2892 // boot loader's package entry table. If so, then it sets the classpath_index
2893 // in the package entry record.
2894 //
2895 // The classpath_index field is used to find the entry on the boot loader class
2896 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
2897 // in an unnamed module. It is also used to indicate (for all packages whose
2898 // classes are loaded by the boot loader) that at least one of the package's
2899 // classes has been loaded.
2900 void InstanceKlass::set_classpath_index(s2 path_index, TRAPS) {
2901 if (_package_entry != NULL) {
2902 DEBUG_ONLY(PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();)
2903 assert(pkg_entry_tbl->lookup_only(_package_entry->name()) == _package_entry, "Should be same");
2904 assert(path_index != -1, "Unexpected classpath_index");
2905 _package_entry->set_classpath_index(path_index);
2906 }
2907 }
2908
2909 // different versions of is_same_class_package
2910
2911 bool InstanceKlass::is_same_class_package(const Klass* class2) const {
2912 oop classloader1 = this->class_loader();
2913 PackageEntry* classpkg1 = this->package();
2914 if (class2->is_objArray_klass()) {
2915 class2 = ObjArrayKlass::cast(class2)->bottom_klass();
2916 }
2917
2918 oop classloader2;
2919 PackageEntry* classpkg2;
2920 if (class2->is_instance_klass()) {
2921 classloader2 = class2->class_loader();
2922 classpkg2 = class2->package();
2923 } else {
2924 assert(class2->is_typeArray_klass(), "should be type array");
2925 classloader2 = NULL;
2926 classpkg2 = NULL;
2927 }
2928
2929 // Same package is determined by comparing class loader
2930 // and package entries. Both must be the same. This rule
2931 // applies even to classes that are defined in the unnamed
2932 // package, they still must have the same class loader.
2933 if ((classloader1 == classloader2) && (classpkg1 == classpkg2)) {
2934 return true;
2935 }
2936
2937 return false;
2938 }
2939
2940 // return true if this class and other_class are in the same package. Classloader
2941 // and classname information is enough to determine a class's package
2942 bool InstanceKlass::is_same_class_package(oop other_class_loader,
2943 const Symbol* other_class_name) const {
2944 if (class_loader() != other_class_loader) {
2945 return false;
2946 }
2947 if (name()->fast_compare(other_class_name) == 0) {
2948 return true;
2949 }
2950
2951 {
2952 ResourceMark rm;
2953
2954 bool bad_class_name = false;
2955 TempNewSymbol other_pkg = ClassLoader::package_from_class_name(other_class_name, &bad_class_name);
2956 if (bad_class_name) {
2957 return false;
2958 }
2959 // Check that package_from_class_name() returns NULL, not "", if there is no package.
2960 assert(other_pkg == NULL || other_pkg->utf8_length() > 0, "package name is empty string");
2961
2962 const Symbol* const this_package_name =
2963 this->package() != NULL ? this->package()->name() : NULL;
2964
2965 if (this_package_name == NULL || other_pkg == NULL) {
2966 // One of the two doesn't have a package. Only return true if the other
2967 // one also doesn't have a package.
2968 return this_package_name == other_pkg;
2969 }
2970
2971 // Check if package is identical
2972 return this_package_name->fast_compare(other_pkg) == 0;
2973 }
2974 }
2975
2976 // Returns true iff super_method can be overridden by a method in targetclassname
2977 // See JLS 3rd edition 8.4.6.1
2978 // Assumes name-signature match
2979 // "this" is InstanceKlass of super_method which must exist
2980 // note that the InstanceKlass of the method in the targetclassname has not always been created yet
2981 bool InstanceKlass::is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) {
2982 // Private methods can not be overridden
2983 if (super_method->is_private()) {
2984 return false;
2985 }
2986 // If super method is accessible, then override
2987 if ((super_method->is_protected()) ||
2988 (super_method->is_public())) {
2989 return true;
2990 }
2991 // Package-private methods are not inherited outside of package
2992 assert(super_method->is_package_private(), "must be package private");
2993 return(is_same_class_package(targetclassloader(), targetclassname));
2994 }
2995
2996 // Only boot and platform class loaders can define classes in "java/" packages.
2997 void InstanceKlass::check_prohibited_package(Symbol* class_name,
2998 ClassLoaderData* loader_data,
2999 TRAPS) {
3000 if (!loader_data->is_boot_class_loader_data() &&
3001 !loader_data->is_platform_class_loader_data() &&
3002 class_name != NULL) {
3003 ResourceMark rm(THREAD);
3004 char* name = class_name->as_C_string();
3005 if (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/') {
3006 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name);
3007 assert(pkg_name != NULL, "Error in parsing package name starting with 'java/'");
3008 name = pkg_name->as_C_string();
3009 const char* class_loader_name = loader_data->loader_name_and_id();
3010 StringUtils::replace_no_expand(name, "/", ".");
3011 const char* msg_text1 = "Class loader (instance of): ";
3012 const char* msg_text2 = " tried to load prohibited package name: ";
3013 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1;
3014 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
3015 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name);
3016 THROW_MSG(vmSymbols::java_lang_SecurityException(), message);
3017 }
3018 }
3019 return;
3020 }
3021
3022 bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const {
3023 constantPoolHandle i_cp(THREAD, constants());
3024 for (InnerClassesIterator iter(this); !iter.done(); iter.next()) {
3025 int ioff = iter.inner_class_info_index();
3026 if (ioff != 0) {
3027 // Check to see if the name matches the class we're looking for
3028 // before attempting to find the class.
3029 if (i_cp->klass_name_at_matches(this, ioff)) {
3030 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false);
3031 if (this == inner_klass) {
3032 *ooff = iter.outer_class_info_index();
3033 *noff = iter.inner_name_index();
3034 return true;
3035 }
3036 }
3037 }
3038 }
3039 return false;
3040 }
3041
3042 InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const {
3043 InstanceKlass* outer_klass = NULL;
3044 *inner_is_member = false;
3045 int ooff = 0, noff = 0;
3046 bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD);
3047 if (has_inner_classes_attr) {
3048 constantPoolHandle i_cp(THREAD, constants());
3049 if (ooff != 0) {
3050 Klass* ok = i_cp->klass_at(ooff, CHECK_NULL);
3051 outer_klass = InstanceKlass::cast(ok);
3052 *inner_is_member = true;
3053 }
3054 if (NULL == outer_klass) {
3055 // It may be a local or anonymous class; try for that.
3056 int encl_method_class_idx = enclosing_method_class_index();
3057 if (encl_method_class_idx != 0) {
3058 Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
3059 outer_klass = InstanceKlass::cast(ok);
3060 *inner_is_member = false;
3061 }
3062 }
3063 }
3064
3065 // If no inner class attribute found for this class.
3066 if (NULL == outer_klass) return NULL;
3067
3068 // Throws an exception if outer klass has not declared k as an inner klass
3069 // We need evidence that each klass knows about the other, or else
3070 // the system could allow a spoof of an inner class to gain access rights.
3071 Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL);
3072 return outer_klass;
3073 }
3074
3075 jint InstanceKlass::compute_modifier_flags(TRAPS) const {
3076 jint access = access_flags().as_int();
3077
3078 // But check if it happens to be member class.
3079 InnerClassesIterator iter(this);
3080 for (; !iter.done(); iter.next()) {
3081 int ioff = iter.inner_class_info_index();
3082 // Inner class attribute can be zero, skip it.
3083 // Strange but true: JVM spec. allows null inner class refs.
3084 if (ioff == 0) continue;
3085
3086 // only look at classes that are already loaded
3087 // since we are looking for the flags for our self.
3088 Symbol* inner_name = constants()->klass_name_at(ioff);
3089 if (name() == inner_name) {
3090 // This is really a member class.
3091 access = iter.inner_access_flags();
3092 break;
3093 }
3094 }
3095 // Remember to strip ACC_SUPER bit
3096 return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS;
3097 }
3098
3099 jint InstanceKlass::jvmti_class_status() const {
3100 jint result = 0;
3101
3102 if (is_linked()) {
3103 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
3104 }
3105
3106 if (is_initialized()) {
3107 assert(is_linked(), "Class status is not consistent");
3108 result |= JVMTI_CLASS_STATUS_INITIALIZED;
3109 }
3110 if (is_in_error_state()) {
3111 result |= JVMTI_CLASS_STATUS_ERROR;
3112 }
3113 return result;
3114 }
3115
3116 Method* InstanceKlass::method_at_itable(Klass* holder, int index, TRAPS) {
3117 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
3118 int method_table_offset_in_words = ioe->offset()/wordSize;
3119 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
3120 / itableOffsetEntry::size();
3121
3122 for (int cnt = 0 ; ; cnt ++, ioe ++) {
3123 // If the interface isn't implemented by the receiver class,
3124 // the VM should throw IncompatibleClassChangeError.
3125 if (cnt >= nof_interfaces) {
3126 ResourceMark rm(THREAD);
3127 stringStream ss;
3128 bool same_module = (module() == holder->module());
3129 ss.print("Receiver class %s does not implement "
3130 "the interface %s defining the method to be called "
3131 "(%s%s%s)",
3132 external_name(), holder->external_name(),
3133 (same_module) ? joint_in_module_of_loader(holder) : class_in_module_of_loader(),
3134 (same_module) ? "" : "; ",
3135 (same_module) ? "" : holder->class_in_module_of_loader());
3136 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
3137 }
3138
3139 Klass* ik = ioe->interface_klass();
3140 if (ik == holder) break;
3141 }
3142
3143 itableMethodEntry* ime = ioe->first_method_entry(this);
3144 Method* m = ime[index].method();
3145 if (m == NULL) {
3146 THROW_NULL(vmSymbols::java_lang_AbstractMethodError());
3147 }
3148 return m;
3149 }
3150
3151
3152 #if INCLUDE_JVMTI
3153 // update default_methods for redefineclasses for methods that are
3154 // not yet in the vtable due to concurrent subclass define and superinterface
3155 // redefinition
3156 // Note: those in the vtable, should have been updated via adjust_method_entries
3157 void InstanceKlass::adjust_default_methods(bool* trace_name_printed) {
3158 // search the default_methods for uses of either obsolete or EMCP methods
3159 if (default_methods() != NULL) {
3160 for (int index = 0; index < default_methods()->length(); index ++) {
3161 Method* old_method = default_methods()->at(index);
3162 if (old_method == NULL || !old_method->is_old()) {
3163 continue; // skip uninteresting entries
3164 }
3165 assert(!old_method->is_deleted(), "default methods may not be deleted");
3166 Method* new_method = old_method->get_new_method();
3167 default_methods()->at_put(index, new_method);
3168
3169 if (log_is_enabled(Info, redefine, class, update)) {
3170 ResourceMark rm;
3171 if (!(*trace_name_printed)) {
3172 log_info(redefine, class, update)
3173 ("adjust: klassname=%s default methods from name=%s",
3174 external_name(), old_method->method_holder()->external_name());
3175 *trace_name_printed = true;
3176 }
3177 log_debug(redefine, class, update, vtables)
3178 ("default method update: %s(%s) ",
3179 new_method->name()->as_C_string(), new_method->signature()->as_C_string());
3180 }
3181 }
3182 }
3183 }
3184 #endif // INCLUDE_JVMTI
3185
3186 // On-stack replacement stuff
3187 void InstanceKlass::add_osr_nmethod(nmethod* n) {
3188 assert_lock_strong(CompiledMethod_lock);
3189 #ifndef PRODUCT
3190 if (TieredCompilation) {
3191 nmethod* prev = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), n->comp_level(), true);
3192 assert(prev == NULL || !prev->is_in_use() COMPILER2_PRESENT(|| StressRecompilation),
3193 "redundant OSR recompilation detected. memory leak in CodeCache!");
3194 }
3195 #endif
3196 // only one compilation can be active
3197 {
3198 assert(n->is_osr_method(), "wrong kind of nmethod");
3199 n->set_osr_link(osr_nmethods_head());
3200 set_osr_nmethods_head(n);
3201 // Raise the highest osr level if necessary
3202 if (TieredCompilation) {
3203 Method* m = n->method();
3204 m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level()));
3205 }
3206 }
3207
3208 // Get rid of the osr methods for the same bci that have lower levels.
3209 if (TieredCompilation) {
3210 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) {
3211 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true);
3212 if (inv != NULL && inv->is_in_use()) {
3213 inv->make_not_entrant();
3214 }
3215 }
3216 }
3217 }
3218
3219 // Remove osr nmethod from the list. Return true if found and removed.
3220 bool InstanceKlass::remove_osr_nmethod(nmethod* n) {
3221 // This is a short non-blocking critical region, so the no safepoint check is ok.
3222 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock
3223 , Mutex::_no_safepoint_check_flag);
3224 assert(n->is_osr_method(), "wrong kind of nmethod");
3225 nmethod* last = NULL;
3226 nmethod* cur = osr_nmethods_head();
3227 int max_level = CompLevel_none; // Find the max comp level excluding n
3228 Method* m = n->method();
3229 // Search for match
3230 bool found = false;
3231 while(cur != NULL && cur != n) {
3232 if (TieredCompilation && m == cur->method()) {
3233 // Find max level before n
3234 max_level = MAX2(max_level, cur->comp_level());
3235 }
3236 last = cur;
3237 cur = cur->osr_link();
3238 }
3239 nmethod* next = NULL;
3240 if (cur == n) {
3241 found = true;
3242 next = cur->osr_link();
3243 if (last == NULL) {
3244 // Remove first element
3245 set_osr_nmethods_head(next);
3246 } else {
3247 last->set_osr_link(next);
3248 }
3249 }
3250 n->set_osr_link(NULL);
3251 if (TieredCompilation) {
3252 cur = next;
3253 while (cur != NULL) {
3254 // Find max level after n
3255 if (m == cur->method()) {
3256 max_level = MAX2(max_level, cur->comp_level());
3257 }
3258 cur = cur->osr_link();
3259 }
3260 m->set_highest_osr_comp_level(max_level);
3261 }
3262 return found;
3263 }
3264
3265 int InstanceKlass::mark_osr_nmethods(const Method* m) {
3266 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock,
3267 Mutex::_no_safepoint_check_flag);
3268 nmethod* osr = osr_nmethods_head();
3269 int found = 0;
3270 while (osr != NULL) {
3271 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3272 if (osr->method() == m) {
3273 osr->mark_for_deoptimization();
3274 found++;
3275 }
3276 osr = osr->osr_link();
3277 }
3278 return found;
3279 }
3280
3281 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
3282 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock,
3283 Mutex::_no_safepoint_check_flag);
3284 nmethod* osr = osr_nmethods_head();
3285 nmethod* best = NULL;
3286 while (osr != NULL) {
3287 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3288 // There can be a time when a c1 osr method exists but we are waiting
3289 // for a c2 version. When c2 completes its osr nmethod we will trash
3290 // the c1 version and only be able to find the c2 version. However
3291 // while we overflow in the c1 code at back branches we don't want to
3292 // try and switch to the same code as we are already running
3293
3294 if (osr->method() == m &&
3295 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
3296 if (match_level) {
3297 if (osr->comp_level() == comp_level) {
3298 // Found a match - return it.
3299 return osr;
3300 }
3301 } else {
3302 if (best == NULL || (osr->comp_level() > best->comp_level())) {
3303 if (osr->comp_level() == CompLevel_highest_tier) {
3304 // Found the best possible - return it.
3305 return osr;
3306 }
3307 best = osr;
3308 }
3309 }
3310 }
3311 osr = osr->osr_link();
3312 }
3313
3314 assert(match_level == false || best == NULL, "shouldn't pick up anything if match_level is set");
3315 if (best != NULL && best->comp_level() >= comp_level) {
3316 return best;
3317 }
3318 return NULL;
3319 }
3320
3321 // -----------------------------------------------------------------------------------------------------
3322 // Printing
3323
3324 #ifndef PRODUCT
3325
3326 #define BULLET " - "
3327
3328 static const char* state_names[] = {
3329 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
3330 };
3331
3332 static void print_vtable(intptr_t* start, int len, outputStream* st) {
3333 for (int i = 0; i < len; i++) {
3334 intptr_t e = start[i];
3335 st->print("%d : " INTPTR_FORMAT, i, e);
3336 if (MetaspaceObj::is_valid((Metadata*)e)) {
3337 st->print(" ");
3338 ((Metadata*)e)->print_value_on(st);
3339 }
3340 st->cr();
3341 }
3342 }
3343
3344 static void print_vtable(vtableEntry* start, int len, outputStream* st) {
3345 return print_vtable(reinterpret_cast<intptr_t*>(start), len, st);
3346 }
3347
3348 void InstanceKlass::print_on(outputStream* st) const {
3349 assert(is_klass(), "must be klass");
3350 Klass::print_on(st);
3351
3352 st->print(BULLET"instance size: %d", size_helper()); st->cr();
3353 st->print(BULLET"klass size: %d", size()); st->cr();
3354 st->print(BULLET"access: "); access_flags().print_on(st); st->cr();
3355 st->print(BULLET"state: "); st->print_cr("%s", state_names[_init_state]);
3356 st->print(BULLET"name: "); name()->print_value_on(st); st->cr();
3357 st->print(BULLET"super: "); Metadata::print_value_on_maybe_null(st, super()); st->cr();
3358 st->print(BULLET"sub: ");
3359 Klass* sub = subklass();
3360 int n;
3361 for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) {
3362 if (n < MaxSubklassPrintSize) {
3363 sub->print_value_on(st);
3364 st->print(" ");
3365 }
3366 }
3367 if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize);
3368 st->cr();
3369
3370 if (is_interface()) {
3371 st->print_cr(BULLET"nof implementors: %d", nof_implementors());
3372 if (nof_implementors() == 1) {
3373 st->print_cr(BULLET"implementor: ");
3374 st->print(" ");
3375 implementor()->print_value_on(st);
3376 st->cr();
3377 }
3378 }
3379
3380 st->print(BULLET"arrays: "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr();
3381 st->print(BULLET"methods: "); methods()->print_value_on(st); st->cr();
3382 if (Verbose || WizardMode) {
3383 Array<Method*>* method_array = methods();
3384 for (int i = 0; i < method_array->length(); i++) {
3385 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3386 }
3387 }
3388 st->print(BULLET"method ordering: "); method_ordering()->print_value_on(st); st->cr();
3389 st->print(BULLET"default_methods: "); default_methods()->print_value_on(st); st->cr();
3390 if (Verbose && default_methods() != NULL) {
3391 Array<Method*>* method_array = default_methods();
3392 for (int i = 0; i < method_array->length(); i++) {
3393 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3394 }
3395 }
3396 if (default_vtable_indices() != NULL) {
3397 st->print(BULLET"default vtable indices: "); default_vtable_indices()->print_value_on(st); st->cr();
3398 }
3399 st->print(BULLET"local interfaces: "); local_interfaces()->print_value_on(st); st->cr();
3400 st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr();
3401 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr();
3402 if (class_loader_data() != NULL) {
3403 st->print(BULLET"class loader data: ");
3404 class_loader_data()->print_value_on(st);
3405 st->cr();
3406 }
3407 st->print(BULLET"unsafe anonymous host class: "); Metadata::print_value_on_maybe_null(st, unsafe_anonymous_host()); st->cr();
3408 if (source_file_name() != NULL) {
3409 st->print(BULLET"source file: ");
3410 source_file_name()->print_value_on(st);
3411 st->cr();
3412 }
3413 if (source_debug_extension() != NULL) {
3414 st->print(BULLET"source debug extension: ");
3415 st->print("%s", source_debug_extension());
3416 st->cr();
3417 }
3418 st->print(BULLET"class annotations: "); class_annotations()->print_value_on(st); st->cr();
3419 st->print(BULLET"class type annotations: "); class_type_annotations()->print_value_on(st); st->cr();
3420 st->print(BULLET"field annotations: "); fields_annotations()->print_value_on(st); st->cr();
3421 st->print(BULLET"field type annotations: "); fields_type_annotations()->print_value_on(st); st->cr();
3422 {
3423 bool have_pv = false;
3424 // previous versions are linked together through the InstanceKlass
3425 for (InstanceKlass* pv_node = previous_versions();
3426 pv_node != NULL;
3427 pv_node = pv_node->previous_versions()) {
3428 if (!have_pv)
3429 st->print(BULLET"previous version: ");
3430 have_pv = true;
3431 pv_node->constants()->print_value_on(st);
3432 }
3433 if (have_pv) st->cr();
3434 }
3435
3436 if (generic_signature() != NULL) {
3437 st->print(BULLET"generic signature: ");
3438 generic_signature()->print_value_on(st);
3439 st->cr();
3440 }
3441 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr();
3442 st->print(BULLET"nest members: "); nest_members()->print_value_on(st); st->cr();
3443 if (record_components() != NULL) {
3444 st->print(BULLET"record components: "); record_components()->print_value_on(st); st->cr();
3445 }
3446 st->print(BULLET"permitted subclasses: "); permitted_subclasses()->print_value_on(st); st->cr();
3447 if (java_mirror() != NULL) {
3448 st->print(BULLET"java mirror: ");
3449 java_mirror()->print_value_on(st);
3450 st->cr();
3451 } else {
3452 st->print_cr(BULLET"java mirror: NULL");
3453 }
3454 st->print(BULLET"vtable length %d (start addr: " INTPTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
3455 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st);
3456 st->print(BULLET"itable length %d (start addr: " INTPTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
3457 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_itable(), itable_length(), st);
3458 st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
3459 FieldPrinter print_static_field(st);
3460 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
3461 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
3462 FieldPrinter print_nonstatic_field(st);
3463 InstanceKlass* ik = const_cast<InstanceKlass*>(this);
3464 ik->do_nonstatic_fields(&print_nonstatic_field);
3465
3466 st->print(BULLET"non-static oop maps: ");
3467 OopMapBlock* map = start_of_nonstatic_oop_maps();
3468 OopMapBlock* end_map = map + nonstatic_oop_map_count();
3469 while (map < end_map) {
3470 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
3471 map++;
3472 }
3473 st->cr();
3474 }
3475
3476 #endif //PRODUCT
3477
3478 void InstanceKlass::print_value_on(outputStream* st) const {
3479 assert(is_klass(), "must be klass");
3480 if (Verbose || WizardMode) access_flags().print_on(st);
3481 name()->print_value_on(st);
3482 }
3483
3484 #ifndef PRODUCT
3485
3486 void FieldPrinter::do_field(fieldDescriptor* fd) {
3487 _st->print(BULLET);
3488 if (_obj == NULL) {
3489 fd->print_on(_st);
3490 _st->cr();
3491 } else {
3492 fd->print_on_for(_st, _obj);
3493 _st->cr();
3494 }
3495 }
3496
3497
3498 void InstanceKlass::oop_print_on(oop obj, outputStream* st) {
3499 Klass::oop_print_on(obj, st);
3500
3501 if (this == SystemDictionary::String_klass()) {
3502 typeArrayOop value = java_lang_String::value(obj);
3503 juint length = java_lang_String::length(obj);
3504 if (value != NULL &&
3505 value->is_typeArray() &&
3506 length <= (juint) value->length()) {
3507 st->print(BULLET"string: ");
3508 java_lang_String::print(obj, st);
3509 st->cr();
3510 if (!WizardMode) return; // that is enough
3511 }
3512 }
3513
3514 st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj));
3515 FieldPrinter print_field(st, obj);
3516 do_nonstatic_fields(&print_field);
3517
3518 if (this == SystemDictionary::Class_klass()) {
3519 st->print(BULLET"signature: ");
3520 java_lang_Class::print_signature(obj, st);
3521 st->cr();
3522 Klass* mirrored_klass = java_lang_Class::as_Klass(obj);
3523 st->print(BULLET"fake entry for mirror: ");
3524 Metadata::print_value_on_maybe_null(st, mirrored_klass);
3525 st->cr();
3526 Klass* array_klass = java_lang_Class::array_klass_acquire(obj);
3527 st->print(BULLET"fake entry for array: ");
3528 Metadata::print_value_on_maybe_null(st, array_klass);
3529 st->cr();
3530 st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj));
3531 st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj));
3532 Klass* real_klass = java_lang_Class::as_Klass(obj);
3533 if (real_klass != NULL && real_klass->is_instance_klass()) {
3534 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
3535 }
3536 } else if (this == SystemDictionary::MethodType_klass()) {
3537 st->print(BULLET"signature: ");
3538 java_lang_invoke_MethodType::print_signature(obj, st);
3539 st->cr();
3540 }
3541 }
3542
3543 bool InstanceKlass::verify_itable_index(int i) {
3544 int method_count = klassItable::method_count_for_interface(this);
3545 assert(i >= 0 && i < method_count, "index out of bounds");
3546 return true;
3547 }
3548
3549 #endif //PRODUCT
3550
3551 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
3552 st->print("a ");
3553 name()->print_value_on(st);
3554 obj->print_address_on(st);
3555 if (this == SystemDictionary::String_klass()
3556 && java_lang_String::value(obj) != NULL) {
3557 ResourceMark rm;
3558 int len = java_lang_String::length(obj);
3559 int plen = (len < 24 ? len : 12);
3560 char* str = java_lang_String::as_utf8_string(obj, 0, plen);
3561 st->print(" = \"%s\"", str);
3562 if (len > plen)
3563 st->print("...[%d]", len);
3564 } else if (this == SystemDictionary::Class_klass()) {
3565 Klass* k = java_lang_Class::as_Klass(obj);
3566 st->print(" = ");
3567 if (k != NULL) {
3568 k->print_value_on(st);
3569 } else {
3570 const char* tname = type2name(java_lang_Class::primitive_type(obj));
3571 st->print("%s", tname ? tname : "type?");
3572 }
3573 } else if (this == SystemDictionary::MethodType_klass()) {
3574 st->print(" = ");
3575 java_lang_invoke_MethodType::print_signature(obj, st);
3576 } else if (java_lang_boxing_object::is_instance(obj)) {
3577 st->print(" = ");
3578 java_lang_boxing_object::print(obj, st);
3579 } else if (this == SystemDictionary::LambdaForm_klass()) {
3580 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
3581 if (vmentry != NULL) {
3582 st->print(" => ");
3583 vmentry->print_value_on(st);
3584 }
3585 } else if (this == SystemDictionary::MemberName_klass()) {
3586 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
3587 if (vmtarget != NULL) {
3588 st->print(" = ");
3589 vmtarget->print_value_on(st);
3590 } else {
3591 java_lang_invoke_MemberName::clazz(obj)->print_value_on(st);
3592 st->print(".");
3593 java_lang_invoke_MemberName::name(obj)->print_value_on(st);
3594 }
3595 }
3596 }
3597
3598 const char* InstanceKlass::internal_name() const {
3599 return external_name();
3600 }
3601
3602 void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data,
3603 const ModuleEntry* module_entry,
3604 const ClassFileStream* cfs) const {
3605 log_to_classlist(cfs);
3606
3607 if (!log_is_enabled(Info, class, load)) {
3608 return;
3609 }
3610
3611 ResourceMark rm;
3612 LogMessage(class, load) msg;
3613 stringStream info_stream;
3614
3615 // Name and class hierarchy info
3616 info_stream.print("%s", external_name());
3617
3618 // Source
3619 if (cfs != NULL) {
3620 if (cfs->source() != NULL) {
3621 const char* module_name = (module_entry->name() == NULL) ? UNNAMED_MODULE : module_entry->name()->as_C_string();
3622 if (module_name != NULL) {
3623 // When the boot loader created the stream, it didn't know the module name
3624 // yet. Let's format it now.
3625 if (cfs->from_boot_loader_modules_image()) {
3626 info_stream.print(" source: jrt:/%s", module_name);
3627 } else {
3628 info_stream.print(" source: %s", cfs->source());
3629 }
3630 } else {
3631 info_stream.print(" source: %s", cfs->source());
3632 }
3633 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) {
3634 Thread* THREAD = Thread::current();
3635 Klass* caller =
3636 THREAD->is_Java_thread()
3637 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
3638 : NULL;
3639 // caller can be NULL, for example, during a JVMTI VM_Init hook
3640 if (caller != NULL) {
3641 info_stream.print(" source: instance of %s", caller->external_name());
3642 } else {
3643 // source is unknown
3644 }
3645 } else {
3646 oop class_loader = loader_data->class_loader();
3647 info_stream.print(" source: %s", class_loader->klass()->external_name());
3648 }
3649 } else {
3650 assert(this->is_shared(), "must be");
3651 if (MetaspaceShared::is_shared_dynamic((void*)this)) {
3652 info_stream.print(" source: shared objects file (top)");
3653 } else {
3654 info_stream.print(" source: shared objects file");
3655 }
3656 }
3657
3658 msg.info("%s", info_stream.as_string());
3659
3660 if (log_is_enabled(Debug, class, load)) {
3661 stringStream debug_stream;
3662
3663 // Class hierarchy info
3664 debug_stream.print(" klass: " INTPTR_FORMAT " super: " INTPTR_FORMAT,
3665 p2i(this), p2i(superklass()));
3666
3667 // Interfaces
3668 if (local_interfaces() != NULL && local_interfaces()->length() > 0) {
3669 debug_stream.print(" interfaces:");
3670 int length = local_interfaces()->length();
3671 for (int i = 0; i < length; i++) {
3672 debug_stream.print(" " INTPTR_FORMAT,
3673 p2i(InstanceKlass::cast(local_interfaces()->at(i))));
3674 }
3675 }
3676
3677 // Class loader
3678 debug_stream.print(" loader: [");
3679 loader_data->print_value_on(&debug_stream);
3680 debug_stream.print("]");
3681
3682 // Classfile checksum
3683 if (cfs) {
3684 debug_stream.print(" bytes: %d checksum: %08x",
3685 cfs->length(),
3686 ClassLoader::crc32(0, (const char*)cfs->buffer(),
3687 cfs->length()));
3688 }
3689
3690 msg.debug("%s", debug_stream.as_string());
3691 }
3692 }
3693
3694 // Verification
3695
3696 class VerifyFieldClosure: public BasicOopIterateClosure {
3697 protected:
3698 template <class T> void do_oop_work(T* p) {
3699 oop obj = RawAccess<>::oop_load(p);
3700 if (!oopDesc::is_oop_or_null(obj)) {
3701 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj));
3702 Universe::print_on(tty);
3703 guarantee(false, "boom");
3704 }
3705 }
3706 public:
3707 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); }
3708 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
3709 };
3710
3711 void InstanceKlass::verify_on(outputStream* st) {
3712 #ifndef PRODUCT
3713 // Avoid redundant verifies, this really should be in product.
3714 if (_verify_count == Universe::verify_count()) return;
3715 _verify_count = Universe::verify_count();
3716 #endif
3717
3718 // Verify Klass
3719 Klass::verify_on(st);
3720
3721 // Verify that klass is present in ClassLoaderData
3722 guarantee(class_loader_data()->contains_klass(this),
3723 "this class isn't found in class loader data");
3724
3725 // Verify vtables
3726 if (is_linked()) {
3727 // $$$ This used to be done only for m/s collections. Doing it
3728 // always seemed a valid generalization. (DLD -- 6/00)
3729 vtable().verify(st);
3730 }
3731
3732 // Verify first subklass
3733 if (subklass() != NULL) {
3734 guarantee(subklass()->is_klass(), "should be klass");
3735 }
3736
3737 // Verify siblings
3738 Klass* super = this->super();
3739 Klass* sib = next_sibling();
3740 if (sib != NULL) {
3741 if (sib == this) {
3742 fatal("subclass points to itself " PTR_FORMAT, p2i(sib));
3743 }
3744
3745 guarantee(sib->is_klass(), "should be klass");
3746 guarantee(sib->super() == super, "siblings should have same superklass");
3747 }
3748
3749 // Verify local interfaces
3750 if (local_interfaces()) {
3751 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
3752 for (int j = 0; j < local_interfaces->length(); j++) {
3753 InstanceKlass* e = local_interfaces->at(j);
3754 guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
3755 }
3756 }
3757
3758 // Verify transitive interfaces
3759 if (transitive_interfaces() != NULL) {
3760 Array<InstanceKlass*>* transitive_interfaces = this->transitive_interfaces();
3761 for (int j = 0; j < transitive_interfaces->length(); j++) {
3762 InstanceKlass* e = transitive_interfaces->at(j);
3763 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
3764 }
3765 }
3766
3767 // Verify methods
3768 if (methods() != NULL) {
3769 Array<Method*>* methods = this->methods();
3770 for (int j = 0; j < methods->length(); j++) {
3771 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3772 }
3773 for (int j = 0; j < methods->length() - 1; j++) {
3774 Method* m1 = methods->at(j);
3775 Method* m2 = methods->at(j + 1);
3776 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3777 }
3778 }
3779
3780 // Verify method ordering
3781 if (method_ordering() != NULL) {
3782 Array<int>* method_ordering = this->method_ordering();
3783 int length = method_ordering->length();
3784 if (JvmtiExport::can_maintain_original_method_order() ||
3785 ((UseSharedSpaces || Arguments::is_dumping_archive()) && length != 0)) {
3786 guarantee(length == methods()->length(), "invalid method ordering length");
3787 jlong sum = 0;
3788 for (int j = 0; j < length; j++) {
3789 int original_index = method_ordering->at(j);
3790 guarantee(original_index >= 0, "invalid method ordering index");
3791 guarantee(original_index < length, "invalid method ordering index");
3792 sum += original_index;
3793 }
3794 // Verify sum of indices 0,1,...,length-1
3795 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
3796 } else {
3797 guarantee(length == 0, "invalid method ordering length");
3798 }
3799 }
3800
3801 // Verify default methods
3802 if (default_methods() != NULL) {
3803 Array<Method*>* methods = this->default_methods();
3804 for (int j = 0; j < methods->length(); j++) {
3805 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3806 }
3807 for (int j = 0; j < methods->length() - 1; j++) {
3808 Method* m1 = methods->at(j);
3809 Method* m2 = methods->at(j + 1);
3810 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3811 }
3812 }
3813
3814 // Verify JNI static field identifiers
3815 if (jni_ids() != NULL) {
3816 jni_ids()->verify(this);
3817 }
3818
3819 // Verify other fields
3820 if (constants() != NULL) {
3821 guarantee(constants()->is_constantPool(), "should be constant pool");
3822 }
3823 const Klass* anonymous_host = unsafe_anonymous_host();
3824 if (anonymous_host != NULL) {
3825 guarantee(anonymous_host->is_klass(), "should be klass");
3826 }
3827 }
3828
3829 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
3830 Klass::oop_verify_on(obj, st);
3831 VerifyFieldClosure blk;
3832 obj->oop_iterate(&blk);
3833 }
3834
3835
3836 // JNIid class for jfieldIDs only
3837 // Note to reviewers:
3838 // These JNI functions are just moved over to column 1 and not changed
3839 // in the compressed oops workspace.
3840 JNIid::JNIid(Klass* holder, int offset, JNIid* next) {
3841 _holder = holder;
3842 _offset = offset;
3843 _next = next;
3844 debug_only(_is_static_field_id = false;)
3845 }
3846
3847
3848 JNIid* JNIid::find(int offset) {
3849 JNIid* current = this;
3850 while (current != NULL) {
3851 if (current->offset() == offset) return current;
3852 current = current->next();
3853 }
3854 return NULL;
3855 }
3856
3857 void JNIid::deallocate(JNIid* current) {
3858 while (current != NULL) {
3859 JNIid* next = current->next();
3860 delete current;
3861 current = next;
3862 }
3863 }
3864
3865
3866 void JNIid::verify(Klass* holder) {
3867 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields();
3868 int end_field_offset;
3869 end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize);
3870
3871 JNIid* current = this;
3872 while (current != NULL) {
3873 guarantee(current->holder() == holder, "Invalid klass in JNIid");
3874 #ifdef ASSERT
3875 int o = current->offset();
3876 if (current->is_static_field_id()) {
3877 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid");
3878 }
3879 #endif
3880 current = current->next();
3881 }
3882 }
3883
3884 void InstanceKlass::set_init_state(ClassState state) {
3885 #ifdef ASSERT
3886 bool good_state = is_shared() ? (_init_state <= state)
3887 : (_init_state < state);
3888 assert(good_state || state == allocated, "illegal state transition");
3889 #endif
3890 assert(_init_thread == NULL, "should be cleared before state change");
3891 _init_state = (u1)state;
3892 }
3893
3894 #if INCLUDE_JVMTI
3895
3896 // RedefineClasses() support for previous versions
3897
3898 // Globally, there is at least one previous version of a class to walk
3899 // during class unloading, which is saved because old methods in the class
3900 // are still running. Otherwise the previous version list is cleaned up.
3901 bool InstanceKlass::_has_previous_versions = false;
3902
3903 // Returns true if there are previous versions of a class for class
3904 // unloading only. Also resets the flag to false. purge_previous_version
3905 // will set the flag to true if there are any left, i.e., if there's any
3906 // work to do for next time. This is to avoid the expensive code cache
3907 // walk in CLDG::clean_deallocate_lists().
3908 bool InstanceKlass::has_previous_versions_and_reset() {
3909 bool ret = _has_previous_versions;
3910 log_trace(redefine, class, iklass, purge)("Class unloading: has_previous_versions = %s",
3911 ret ? "true" : "false");
3912 _has_previous_versions = false;
3913 return ret;
3914 }
3915
3916 // Purge previous versions before adding new previous versions of the class and
3917 // during class unloading.
3918 void InstanceKlass::purge_previous_version_list() {
3919 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
3920 assert(has_been_redefined(), "Should only be called for main class");
3921
3922 // Quick exit.
3923 if (previous_versions() == NULL) {
3924 return;
3925 }
3926
3927 // This klass has previous versions so see what we can cleanup
3928 // while it is safe to do so.
3929
3930 int deleted_count = 0; // leave debugging breadcrumbs
3931 int live_count = 0;
3932 ClassLoaderData* loader_data = class_loader_data();
3933 assert(loader_data != NULL, "should never be null");
3934
3935 ResourceMark rm;
3936 log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name());
3937
3938 // previous versions are linked together through the InstanceKlass
3939 InstanceKlass* pv_node = previous_versions();
3940 InstanceKlass* last = this;
3941 int version = 0;
3942
3943 // check the previous versions list
3944 for (; pv_node != NULL; ) {
3945
3946 ConstantPool* pvcp = pv_node->constants();
3947 assert(pvcp != NULL, "cp ref was unexpectedly cleared");
3948
3949 if (!pvcp->on_stack()) {
3950 // If the constant pool isn't on stack, none of the methods
3951 // are executing. Unlink this previous_version.
3952 // The previous version InstanceKlass is on the ClassLoaderData deallocate list
3953 // so will be deallocated during the next phase of class unloading.
3954 log_trace(redefine, class, iklass, purge)
3955 ("previous version " INTPTR_FORMAT " is dead.", p2i(pv_node));
3956 // For debugging purposes.
3957 pv_node->set_is_scratch_class();
3958 // Unlink from previous version list.
3959 assert(pv_node->class_loader_data() == loader_data, "wrong loader_data");
3960 InstanceKlass* next = pv_node->previous_versions();
3961 pv_node->link_previous_versions(NULL); // point next to NULL
3962 last->link_previous_versions(next);
3963 // Delete this node directly. Nothing is referring to it and we don't
3964 // want it to increase the counter for metadata to delete in CLDG.
3965 MetadataFactory::free_metadata(loader_data, pv_node);
3966 pv_node = next;
3967 deleted_count++;
3968 version++;
3969 continue;
3970 } else {
3971 log_trace(redefine, class, iklass, purge)("previous version " INTPTR_FORMAT " is alive", p2i(pv_node));
3972 assert(pvcp->pool_holder() != NULL, "Constant pool with no holder");
3973 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
3974 live_count++;
3975 // found a previous version for next time we do class unloading
3976 _has_previous_versions = true;
3977 }
3978
3979 // At least one method is live in this previous version.
3980 // Reset dead EMCP methods not to get breakpoints.
3981 // All methods are deallocated when all of the methods for this class are no
3982 // longer running.
3983 Array<Method*>* method_refs = pv_node->methods();
3984 if (method_refs != NULL) {
3985 log_trace(redefine, class, iklass, purge)("previous methods length=%d", method_refs->length());
3986 for (int j = 0; j < method_refs->length(); j++) {
3987 Method* method = method_refs->at(j);
3988
3989 if (!method->on_stack()) {
3990 // no breakpoints for non-running methods
3991 if (method->is_running_emcp()) {
3992 method->set_running_emcp(false);
3993 }
3994 } else {
3995 assert (method->is_obsolete() || method->is_running_emcp(),
3996 "emcp method cannot run after emcp bit is cleared");
3997 log_trace(redefine, class, iklass, purge)
3998 ("purge: %s(%s): prev method @%d in version @%d is alive",
3999 method->name()->as_C_string(), method->signature()->as_C_string(), j, version);
4000 }
4001 }
4002 }
4003 // next previous version
4004 last = pv_node;
4005 pv_node = pv_node->previous_versions();
4006 version++;
4007 }
4008 log_trace(redefine, class, iklass, purge)
4009 ("previous version stats: live=%d, deleted=%d", live_count, deleted_count);
4010 }
4011
4012 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods,
4013 int emcp_method_count) {
4014 int obsolete_method_count = old_methods->length() - emcp_method_count;
4015
4016 if (emcp_method_count != 0 && obsolete_method_count != 0 &&
4017 _previous_versions != NULL) {
4018 // We have a mix of obsolete and EMCP methods so we have to
4019 // clear out any matching EMCP method entries the hard way.
4020 int local_count = 0;
4021 for (int i = 0; i < old_methods->length(); i++) {
4022 Method* old_method = old_methods->at(i);
4023 if (old_method->is_obsolete()) {
4024 // only obsolete methods are interesting
4025 Symbol* m_name = old_method->name();
4026 Symbol* m_signature = old_method->signature();
4027
4028 // previous versions are linked together through the InstanceKlass
4029 int j = 0;
4030 for (InstanceKlass* prev_version = _previous_versions;
4031 prev_version != NULL;
4032 prev_version = prev_version->previous_versions(), j++) {
4033
4034 Array<Method*>* method_refs = prev_version->methods();
4035 for (int k = 0; k < method_refs->length(); k++) {
4036 Method* method = method_refs->at(k);
4037
4038 if (!method->is_obsolete() &&
4039 method->name() == m_name &&
4040 method->signature() == m_signature) {
4041 // The current RedefineClasses() call has made all EMCP
4042 // versions of this method obsolete so mark it as obsolete
4043 log_trace(redefine, class, iklass, add)
4044 ("%s(%s): flush obsolete method @%d in version @%d",
4045 m_name->as_C_string(), m_signature->as_C_string(), k, j);
4046
4047 method->set_is_obsolete();
4048 break;
4049 }
4050 }
4051
4052 // The previous loop may not find a matching EMCP method, but
4053 // that doesn't mean that we can optimize and not go any
4054 // further back in the PreviousVersion generations. The EMCP
4055 // method for this generation could have already been made obsolete,
4056 // but there still may be an older EMCP method that has not
4057 // been made obsolete.
4058 }
4059
4060 if (++local_count >= obsolete_method_count) {
4061 // no more obsolete methods so bail out now
4062 break;
4063 }
4064 }
4065 }
4066 }
4067 }
4068
4069 // Save the scratch_class as the previous version if any of the methods are running.
4070 // The previous_versions are used to set breakpoints in EMCP methods and they are
4071 // also used to clean MethodData links to redefined methods that are no longer running.
4072 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class,
4073 int emcp_method_count) {
4074 assert(Thread::current()->is_VM_thread(),
4075 "only VMThread can add previous versions");
4076
4077 ResourceMark rm;
4078 log_trace(redefine, class, iklass, add)
4079 ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count);
4080
4081 // Clean out old previous versions for this class
4082 purge_previous_version_list();
4083
4084 // Mark newly obsolete methods in remaining previous versions. An EMCP method from
4085 // a previous redefinition may be made obsolete by this redefinition.
4086 Array<Method*>* old_methods = scratch_class->methods();
4087 mark_newly_obsolete_methods(old_methods, emcp_method_count);
4088
4089 // If the constant pool for this previous version of the class
4090 // is not marked as being on the stack, then none of the methods
4091 // in this previous version of the class are on the stack so
4092 // we don't need to add this as a previous version.
4093 ConstantPool* cp_ref = scratch_class->constants();
4094 if (!cp_ref->on_stack()) {
4095 log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running");
4096 // For debugging purposes.
4097 scratch_class->set_is_scratch_class();
4098 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class);
4099 return;
4100 }
4101
4102 if (emcp_method_count != 0) {
4103 // At least one method is still running, check for EMCP methods
4104 for (int i = 0; i < old_methods->length(); i++) {
4105 Method* old_method = old_methods->at(i);
4106 if (!old_method->is_obsolete() && old_method->on_stack()) {
4107 // if EMCP method (not obsolete) is on the stack, mark as EMCP so that
4108 // we can add breakpoints for it.
4109
4110 // We set the method->on_stack bit during safepoints for class redefinition
4111 // and use this bit to set the is_running_emcp bit.
4112 // After the safepoint, the on_stack bit is cleared and the running emcp
4113 // method may exit. If so, we would set a breakpoint in a method that
4114 // is never reached, but this won't be noticeable to the programmer.
4115 old_method->set_running_emcp(true);
4116 log_trace(redefine, class, iklass, add)
4117 ("EMCP method %s is on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
4118 } else if (!old_method->is_obsolete()) {
4119 log_trace(redefine, class, iklass, add)
4120 ("EMCP method %s is NOT on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
4121 }
4122 }
4123 }
4124
4125 // Add previous version if any methods are still running.
4126 // Set has_previous_version flag for processing during class unloading.
4127 _has_previous_versions = true;
4128 log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack.");
4129 assert(scratch_class->previous_versions() == NULL, "shouldn't have a previous version");
4130 scratch_class->link_previous_versions(previous_versions());
4131 link_previous_versions(scratch_class);
4132 } // end add_previous_version()
4133
4134 #endif // INCLUDE_JVMTI
4135
4136 Method* InstanceKlass::method_with_idnum(int idnum) {
4137 Method* m = NULL;
4138 if (idnum < methods()->length()) {
4139 m = methods()->at(idnum);
4140 }
4141 if (m == NULL || m->method_idnum() != idnum) {
4142 for (int index = 0; index < methods()->length(); ++index) {
4143 m = methods()->at(index);
4144 if (m->method_idnum() == idnum) {
4145 return m;
4146 }
4147 }
4148 // None found, return null for the caller to handle.
4149 return NULL;
4150 }
4151 return m;
4152 }
4153
4154
4155 Method* InstanceKlass::method_with_orig_idnum(int idnum) {
4156 if (idnum >= methods()->length()) {
4157 return NULL;
4158 }
4159 Method* m = methods()->at(idnum);
4160 if (m != NULL && m->orig_method_idnum() == idnum) {
4161 return m;
4162 }
4163 // Obsolete method idnum does not match the original idnum
4164 for (int index = 0; index < methods()->length(); ++index) {
4165 m = methods()->at(index);
4166 if (m->orig_method_idnum() == idnum) {
4167 return m;
4168 }
4169 }
4170 // None found, return null for the caller to handle.
4171 return NULL;
4172 }
4173
4174
4175 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) {
4176 InstanceKlass* holder = get_klass_version(version);
4177 if (holder == NULL) {
4178 return NULL; // The version of klass is gone, no method is found
4179 }
4180 Method* method = holder->method_with_orig_idnum(idnum);
4181 return method;
4182 }
4183
4184 #if INCLUDE_JVMTI
4185 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() {
4186 return _cached_class_file;
4187 }
4188
4189 jint InstanceKlass::get_cached_class_file_len() {
4190 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
4191 }
4192
4193 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
4194 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
4195 }
4196 #endif
4197
4198 void InstanceKlass::log_to_classlist(const ClassFileStream* stream) const {
4199 #if INCLUDE_CDS
4200 if (DumpLoadedClassList && classlist_file->is_open()) {
4201 if (!ClassLoader::has_jrt_entry()) {
4202 warning("DumpLoadedClassList and CDS are not supported in exploded build");
4203 DumpLoadedClassList = NULL;
4204 return;
4205 }
4206 ClassLoaderData* loader_data = class_loader_data();
4207 if (!SystemDictionaryShared::is_sharing_possible(loader_data)) {
4208 return;
4209 }
4210 bool skip = false;
4211 if (is_shared()) {
4212 assert(stream == NULL, "shared class with stream");
4213 } else {
4214 assert(stream != NULL, "non-shared class without stream");
4215 // skip hidden class and unsafe anonymous class.
4216 if ( is_hidden() || unsafe_anonymous_host() != NULL) {
4217 return;
4218 }
4219 oop class_loader = loader_data->class_loader();
4220 if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
4221 // For the boot and platform class loaders, skip classes that are not found in the
4222 // java runtime image, such as those found in the --patch-module entries.
4223 // These classes can't be loaded from the archive during runtime.
4224 if (!stream->from_boot_loader_modules_image() && strncmp(stream->source(), "jrt:", 4) != 0) {
4225 skip = true;
4226 }
4227
4228 if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
4229 // .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
4230 // as they can be loaded from the archive during runtime.
4231 skip = false;
4232 }
4233 }
4234 }
4235 ResourceMark rm;
4236 if (skip) {
4237 tty->print_cr("skip writing class %s from source %s to classlist file",
4238 name()->as_C_string(), stream->source());
4239 } else {
4240 classlist_file->print_cr("%s", name()->as_C_string());
4241 classlist_file->flush();
4242 }
4243 }
4244 #endif // INCLUDE_CDS
4245 }