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/archiveUtils.hpp"
51 #include "memory/iterator.inline.hpp"
52 #include "memory/metadataFactory.hpp"
53 #include "memory/metaspaceClosure.hpp"
54 #include "memory/metaspaceShared.hpp"
55 #include "memory/oopFactory.hpp"
56 #include "memory/resourceArea.hpp"
57 #include "memory/universe.hpp"
58 #include "oops/fieldStreams.inline.hpp"
59 #include "oops/constantPool.hpp"
60 #include "oops/instanceClassLoaderKlass.hpp"
61 #include "oops/instanceKlass.inline.hpp"
62 #include "oops/instanceMirrorKlass.hpp"
63 #include "oops/instanceOop.hpp"
64 #include "oops/klass.inline.hpp"
65 #include "oops/method.hpp"
66 #include "oops/oop.inline.hpp"
67 #include "oops/recordComponent.hpp"
68 #include "oops/symbol.hpp"
69 #include "prims/jvmtiExport.hpp"
70 #include "prims/jvmtiRedefineClasses.hpp"
71 #include "prims/jvmtiThreadState.hpp"
72 #include "prims/methodComparator.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, find_overpass, find_static, find_private);
1774 }
1775
1776 Method* InstanceKlass::find_method_impl(const Symbol* name,
1777 const Symbol* signature,
1778 OverpassLookupMode overpass_mode,
1779 StaticLookupMode static_mode,
1780 PrivateLookupMode private_mode) const {
1781 return InstanceKlass::find_method_impl(methods(),
1782 name,
1783 signature,
1784 overpass_mode,
1785 static_mode,
1786 private_mode);
1787 }
1788
1789 // find_instance_method looks up the name/signature in the local methods array
1790 // and skips over static methods
1791 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods,
1792 const Symbol* name,
1793 const Symbol* signature,
1794 PrivateLookupMode private_mode) {
1795 Method* const meth = InstanceKlass::find_method_impl(methods,
1796 name,
1797 signature,
1798 find_overpass,
1799 skip_static,
1800 private_mode);
1801 assert(((meth == NULL) || !meth->is_static()),
1802 "find_instance_method should have skipped statics");
1803 return meth;
1804 }
1805
1806 // find_instance_method looks up the name/signature in the local methods array
1807 // and skips over static methods
1808 Method* InstanceKlass::find_instance_method(const Symbol* name,
1809 const Symbol* signature,
1810 PrivateLookupMode private_mode) const {
1811 return InstanceKlass::find_instance_method(methods(), name, signature, private_mode);
1812 }
1813
1814 // Find looks up the name/signature in the local methods array
1815 // and filters on the overpass, static and private flags
1816 // This returns the first one found
1817 // note that the local methods array can have up to one overpass, one static
1818 // and one instance (private or not) with the same name/signature
1819 Method* InstanceKlass::find_local_method(const Symbol* name,
1820 const Symbol* signature,
1821 OverpassLookupMode overpass_mode,
1822 StaticLookupMode static_mode,
1823 PrivateLookupMode private_mode) const {
1824 return InstanceKlass::find_method_impl(methods(),
1825 name,
1826 signature,
1827 overpass_mode,
1828 static_mode,
1829 private_mode);
1830 }
1831
1832 // Find looks up the name/signature in the local methods array
1833 // and filters on the overpass, static and private flags
1834 // This returns the first one found
1835 // note that the local methods array can have up to one overpass, one static
1836 // and one instance (private or not) with the same name/signature
1837 Method* InstanceKlass::find_local_method(const Array<Method*>* methods,
1838 const Symbol* name,
1839 const Symbol* signature,
1840 OverpassLookupMode overpass_mode,
1841 StaticLookupMode static_mode,
1842 PrivateLookupMode private_mode) {
1843 return InstanceKlass::find_method_impl(methods,
1844 name,
1845 signature,
1846 overpass_mode,
1847 static_mode,
1848 private_mode);
1849 }
1850
1851 Method* InstanceKlass::find_method(const Array<Method*>* methods,
1852 const Symbol* name,
1853 const Symbol* signature) {
1854 return InstanceKlass::find_method_impl(methods,
1855 name,
1856 signature,
1857 find_overpass,
1858 find_static,
1859 find_private);
1860 }
1861
1862 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods,
1863 const Symbol* name,
1864 const Symbol* signature,
1865 OverpassLookupMode overpass_mode,
1866 StaticLookupMode static_mode,
1867 PrivateLookupMode private_mode) {
1868 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode);
1869 return hit >= 0 ? methods->at(hit): NULL;
1870 }
1871
1872 // true if method matches signature and conforms to skipping_X conditions.
1873 static bool method_matches(const Method* m,
1874 const Symbol* signature,
1875 bool skipping_overpass,
1876 bool skipping_static,
1877 bool skipping_private) {
1878 return ((m->signature() == signature) &&
1879 (!skipping_overpass || !m->is_overpass()) &&
1880 (!skipping_static || !m->is_static()) &&
1881 (!skipping_private || !m->is_private()));
1882 }
1883
1884 // Used directly for default_methods to find the index into the
1885 // default_vtable_indices, and indirectly by find_method
1886 // find_method_index looks in the local methods array to return the index
1887 // of the matching name/signature. If, overpass methods are being ignored,
1888 // the search continues to find a potential non-overpass match. This capability
1889 // is important during method resolution to prefer a static method, for example,
1890 // over an overpass method.
1891 // There is the possibility in any _method's array to have the same name/signature
1892 // for a static method, an overpass method and a local instance method
1893 // To correctly catch a given method, the search criteria may need
1894 // to explicitly skip the other two. For local instance methods, it
1895 // is often necessary to skip private methods
1896 int InstanceKlass::find_method_index(const Array<Method*>* methods,
1897 const Symbol* name,
1898 const Symbol* signature,
1899 OverpassLookupMode overpass_mode,
1900 StaticLookupMode static_mode,
1901 PrivateLookupMode private_mode) {
1902 const bool skipping_overpass = (overpass_mode == skip_overpass);
1903 const bool skipping_static = (static_mode == skip_static);
1904 const bool skipping_private = (private_mode == skip_private);
1905 const int hit = quick_search(methods, name);
1906 if (hit != -1) {
1907 const Method* const m = methods->at(hit);
1908
1909 // Do linear search to find matching signature. First, quick check
1910 // for common case, ignoring overpasses if requested.
1911 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1912 return hit;
1913 }
1914
1915 // search downwards through overloaded methods
1916 int i;
1917 for (i = hit - 1; i >= 0; --i) {
1918 const Method* const m = methods->at(i);
1919 assert(m->is_method(), "must be method");
1920 if (m->name() != name) {
1921 break;
1922 }
1923 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1924 return i;
1925 }
1926 }
1927 // search upwards
1928 for (i = hit + 1; i < methods->length(); ++i) {
1929 const Method* const m = methods->at(i);
1930 assert(m->is_method(), "must be method");
1931 if (m->name() != name) {
1932 break;
1933 }
1934 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1935 return i;
1936 }
1937 }
1938 // not found
1939 #ifdef ASSERT
1940 const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 :
1941 linear_search(methods, name, signature);
1942 assert(-1 == index, "binary search should have found entry %d", index);
1943 #endif
1944 }
1945 return -1;
1946 }
1947
1948 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const {
1949 return find_method_by_name(methods(), name, end);
1950 }
1951
1952 int InstanceKlass::find_method_by_name(const Array<Method*>* methods,
1953 const Symbol* name,
1954 int* end_ptr) {
1955 assert(end_ptr != NULL, "just checking");
1956 int start = quick_search(methods, name);
1957 int end = start + 1;
1958 if (start != -1) {
1959 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
1960 while (end < methods->length() && (methods->at(end))->name() == name) ++end;
1961 *end_ptr = end;
1962 return start;
1963 }
1964 return -1;
1965 }
1966
1967 // uncached_lookup_method searches both the local class methods array and all
1968 // superclasses methods arrays, skipping any overpass methods in superclasses,
1969 // and possibly skipping private methods.
1970 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
1971 const Symbol* signature,
1972 OverpassLookupMode overpass_mode,
1973 PrivateLookupMode private_mode) const {
1974 OverpassLookupMode overpass_local_mode = overpass_mode;
1975 const Klass* klass = this;
1976 while (klass != NULL) {
1977 Method* const method = InstanceKlass::cast(klass)->find_method_impl(name,
1978 signature,
1979 overpass_local_mode,
1980 find_static,
1981 private_mode);
1982 if (method != NULL) {
1983 return method;
1984 }
1985 klass = klass->super();
1986 overpass_local_mode = skip_overpass; // Always ignore overpass methods in superclasses
1987 }
1988 return NULL;
1989 }
1990
1991 #ifdef ASSERT
1992 // search through class hierarchy and return true if this class or
1993 // one of the superclasses was redefined
1994 bool InstanceKlass::has_redefined_this_or_super() const {
1995 const Klass* klass = this;
1996 while (klass != NULL) {
1997 if (InstanceKlass::cast(klass)->has_been_redefined()) {
1998 return true;
1999 }
2000 klass = klass->super();
2001 }
2002 return false;
2003 }
2004 #endif
2005
2006 // lookup a method in the default methods list then in all transitive interfaces
2007 // Do NOT return private or static methods
2008 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
2009 Symbol* signature) const {
2010 Method* m = NULL;
2011 if (default_methods() != NULL) {
2012 m = find_method(default_methods(), name, signature);
2013 }
2014 // Look up interfaces
2015 if (m == NULL) {
2016 m = lookup_method_in_all_interfaces(name, signature, find_defaults);
2017 }
2018 return m;
2019 }
2020
2021 // lookup a method in all the interfaces that this class implements
2022 // Do NOT return private or static methods, new in JDK8 which are not externally visible
2023 // They should only be found in the initial InterfaceMethodRef
2024 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
2025 Symbol* signature,
2026 DefaultsLookupMode defaults_mode) const {
2027 Array<InstanceKlass*>* all_ifs = transitive_interfaces();
2028 int num_ifs = all_ifs->length();
2029 InstanceKlass *ik = NULL;
2030 for (int i = 0; i < num_ifs; i++) {
2031 ik = all_ifs->at(i);
2032 Method* m = ik->lookup_method(name, signature);
2033 if (m != NULL && m->is_public() && !m->is_static() &&
2034 ((defaults_mode != skip_defaults) || !m->is_default_method())) {
2035 return m;
2036 }
2037 }
2038 return NULL;
2039 }
2040
2041 /* jni_id_for_impl for jfieldIds only */
2042 JNIid* InstanceKlass::jni_id_for_impl(int offset) {
2043 MutexLocker ml(JfieldIdCreation_lock);
2044 // Retry lookup after we got the lock
2045 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
2046 if (probe == NULL) {
2047 // Slow case, allocate new static field identifier
2048 probe = new JNIid(this, offset, jni_ids());
2049 set_jni_ids(probe);
2050 }
2051 return probe;
2052 }
2053
2054
2055 /* jni_id_for for jfieldIds only */
2056 JNIid* InstanceKlass::jni_id_for(int offset) {
2057 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
2058 if (probe == NULL) {
2059 probe = jni_id_for_impl(offset);
2060 }
2061 return probe;
2062 }
2063
2064 u2 InstanceKlass::enclosing_method_data(int offset) const {
2065 const Array<jushort>* const inner_class_list = inner_classes();
2066 if (inner_class_list == NULL) {
2067 return 0;
2068 }
2069 const int length = inner_class_list->length();
2070 if (length % inner_class_next_offset == 0) {
2071 return 0;
2072 }
2073 const int index = length - enclosing_method_attribute_size;
2074 assert(offset < enclosing_method_attribute_size, "invalid offset");
2075 return inner_class_list->at(index + offset);
2076 }
2077
2078 void InstanceKlass::set_enclosing_method_indices(u2 class_index,
2079 u2 method_index) {
2080 Array<jushort>* inner_class_list = inner_classes();
2081 assert (inner_class_list != NULL, "_inner_classes list is not set up");
2082 int length = inner_class_list->length();
2083 if (length % inner_class_next_offset == enclosing_method_attribute_size) {
2084 int index = length - enclosing_method_attribute_size;
2085 inner_class_list->at_put(
2086 index + enclosing_method_class_index_offset, class_index);
2087 inner_class_list->at_put(
2088 index + enclosing_method_method_index_offset, method_index);
2089 }
2090 }
2091
2092 // Lookup or create a jmethodID.
2093 // This code is called by the VMThread and JavaThreads so the
2094 // locking has to be done very carefully to avoid deadlocks
2095 // and/or other cache consistency problems.
2096 //
2097 jmethodID InstanceKlass::get_jmethod_id(const methodHandle& method_h) {
2098 size_t idnum = (size_t)method_h->method_idnum();
2099 jmethodID* jmeths = methods_jmethod_ids_acquire();
2100 size_t length = 0;
2101 jmethodID id = NULL;
2102
2103 // We use a double-check locking idiom here because this cache is
2104 // performance sensitive. In the normal system, this cache only
2105 // transitions from NULL to non-NULL which is safe because we use
2106 // release_set_methods_jmethod_ids() to advertise the new cache.
2107 // A partially constructed cache should never be seen by a racing
2108 // thread. We also use release_store() to save a new jmethodID
2109 // in the cache so a partially constructed jmethodID should never be
2110 // seen either. Cache reads of existing jmethodIDs proceed without a
2111 // lock, but cache writes of a new jmethodID requires uniqueness and
2112 // creation of the cache itself requires no leaks so a lock is
2113 // generally acquired in those two cases.
2114 //
2115 // If the RedefineClasses() API has been used, then this cache can
2116 // grow and we'll have transitions from non-NULL to bigger non-NULL.
2117 // Cache creation requires no leaks and we require safety between all
2118 // cache accesses and freeing of the old cache so a lock is generally
2119 // acquired when the RedefineClasses() API has been used.
2120
2121 if (jmeths != NULL) {
2122 // the cache already exists
2123 if (!idnum_can_increment()) {
2124 // the cache can't grow so we can just get the current values
2125 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2126 } else {
2127 // cache can grow so we have to be more careful
2128 if (Threads::number_of_threads() == 0 ||
2129 SafepointSynchronize::is_at_safepoint()) {
2130 // we're single threaded or at a safepoint - no locking needed
2131 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2132 } else {
2133 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2134 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2135 }
2136 }
2137 }
2138 // implied else:
2139 // we need to allocate a cache so default length and id values are good
2140
2141 if (jmeths == NULL || // no cache yet
2142 length <= idnum || // cache is too short
2143 id == NULL) { // cache doesn't contain entry
2144
2145 // This function can be called by the VMThread so we have to do all
2146 // things that might block on a safepoint before grabbing the lock.
2147 // Otherwise, we can deadlock with the VMThread or have a cache
2148 // consistency issue. These vars keep track of what we might have
2149 // to free after the lock is dropped.
2150 jmethodID to_dealloc_id = NULL;
2151 jmethodID* to_dealloc_jmeths = NULL;
2152
2153 // may not allocate new_jmeths or use it if we allocate it
2154 jmethodID* new_jmeths = NULL;
2155 if (length <= idnum) {
2156 // allocate a new cache that might be used
2157 size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count());
2158 new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1, mtClass);
2159 memset(new_jmeths, 0, (size+1)*sizeof(jmethodID));
2160 // cache size is stored in element[0], other elements offset by one
2161 new_jmeths[0] = (jmethodID)size;
2162 }
2163
2164 // allocate a new jmethodID that might be used
2165 jmethodID new_id = NULL;
2166 if (method_h->is_old() && !method_h->is_obsolete()) {
2167 // The method passed in is old (but not obsolete), we need to use the current version
2168 Method* current_method = method_with_idnum((int)idnum);
2169 assert(current_method != NULL, "old and but not obsolete, so should exist");
2170 new_id = Method::make_jmethod_id(class_loader_data(), current_method);
2171 } else {
2172 // It is the current version of the method or an obsolete method,
2173 // use the version passed in
2174 new_id = Method::make_jmethod_id(class_loader_data(), method_h());
2175 }
2176
2177 if (Threads::number_of_threads() == 0 ||
2178 SafepointSynchronize::is_at_safepoint()) {
2179 // we're single threaded or at a safepoint - no locking needed
2180 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2181 &to_dealloc_id, &to_dealloc_jmeths);
2182 } else {
2183 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2184 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2185 &to_dealloc_id, &to_dealloc_jmeths);
2186 }
2187
2188 // The lock has been dropped so we can free resources.
2189 // Free up either the old cache or the new cache if we allocated one.
2190 if (to_dealloc_jmeths != NULL) {
2191 FreeHeap(to_dealloc_jmeths);
2192 }
2193 // free up the new ID since it wasn't needed
2194 if (to_dealloc_id != NULL) {
2195 Method::destroy_jmethod_id(class_loader_data(), to_dealloc_id);
2196 }
2197 }
2198 return id;
2199 }
2200
2201 // Figure out how many jmethodIDs haven't been allocated, and make
2202 // sure space for them is pre-allocated. This makes getting all
2203 // method ids much, much faster with classes with more than 8
2204 // methods, and has a *substantial* effect on performance with jvmti
2205 // code that loads all jmethodIDs for all classes.
2206 void InstanceKlass::ensure_space_for_methodids(int start_offset) {
2207 int new_jmeths = 0;
2208 int length = methods()->length();
2209 for (int index = start_offset; index < length; index++) {
2210 Method* m = methods()->at(index);
2211 jmethodID id = m->find_jmethod_id_or_null();
2212 if (id == NULL) {
2213 new_jmeths++;
2214 }
2215 }
2216 if (new_jmeths != 0) {
2217 Method::ensure_jmethod_ids(class_loader_data(), new_jmeths);
2218 }
2219 }
2220
2221 // Common code to fetch the jmethodID from the cache or update the
2222 // cache with the new jmethodID. This function should never do anything
2223 // that causes the caller to go to a safepoint or we can deadlock with
2224 // the VMThread or have cache consistency issues.
2225 //
2226 jmethodID InstanceKlass::get_jmethod_id_fetch_or_update(
2227 size_t idnum, jmethodID new_id,
2228 jmethodID* new_jmeths, jmethodID* to_dealloc_id_p,
2229 jmethodID** to_dealloc_jmeths_p) {
2230 assert(new_id != NULL, "sanity check");
2231 assert(to_dealloc_id_p != NULL, "sanity check");
2232 assert(to_dealloc_jmeths_p != NULL, "sanity check");
2233 assert(Threads::number_of_threads() == 0 ||
2234 SafepointSynchronize::is_at_safepoint() ||
2235 JmethodIdCreation_lock->owned_by_self(), "sanity check");
2236
2237 // reacquire the cache - we are locked, single threaded or at a safepoint
2238 jmethodID* jmeths = methods_jmethod_ids_acquire();
2239 jmethodID id = NULL;
2240 size_t length = 0;
2241
2242 if (jmeths == NULL || // no cache yet
2243 (length = (size_t)jmeths[0]) <= idnum) { // cache is too short
2244 if (jmeths != NULL) {
2245 // copy any existing entries from the old cache
2246 for (size_t index = 0; index < length; index++) {
2247 new_jmeths[index+1] = jmeths[index+1];
2248 }
2249 *to_dealloc_jmeths_p = jmeths; // save old cache for later delete
2250 }
2251 release_set_methods_jmethod_ids(jmeths = new_jmeths);
2252 } else {
2253 // fetch jmethodID (if any) from the existing cache
2254 id = jmeths[idnum+1];
2255 *to_dealloc_jmeths_p = new_jmeths; // save new cache for later delete
2256 }
2257 if (id == NULL) {
2258 // No matching jmethodID in the existing cache or we have a new
2259 // cache or we just grew the cache. This cache write is done here
2260 // by the first thread to win the foot race because a jmethodID
2261 // needs to be unique once it is generally available.
2262 id = new_id;
2263
2264 // The jmethodID cache can be read while unlocked so we have to
2265 // make sure the new jmethodID is complete before installing it
2266 // in the cache.
2267 Atomic::release_store(&jmeths[idnum+1], id);
2268 } else {
2269 *to_dealloc_id_p = new_id; // save new id for later delete
2270 }
2271 return id;
2272 }
2273
2274
2275 // Common code to get the jmethodID cache length and the jmethodID
2276 // value at index idnum if there is one.
2277 //
2278 void InstanceKlass::get_jmethod_id_length_value(jmethodID* cache,
2279 size_t idnum, size_t *length_p, jmethodID* id_p) {
2280 assert(cache != NULL, "sanity check");
2281 assert(length_p != NULL, "sanity check");
2282 assert(id_p != NULL, "sanity check");
2283
2284 // cache size is stored in element[0], other elements offset by one
2285 *length_p = (size_t)cache[0];
2286 if (*length_p <= idnum) { // cache is too short
2287 *id_p = NULL;
2288 } else {
2289 *id_p = cache[idnum+1]; // fetch jmethodID (if any)
2290 }
2291 }
2292
2293
2294 // Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles
2295 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
2296 size_t idnum = (size_t)method->method_idnum();
2297 jmethodID* jmeths = methods_jmethod_ids_acquire();
2298 size_t length; // length assigned as debugging crumb
2299 jmethodID id = NULL;
2300 if (jmeths != NULL && // If there is a cache
2301 (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough,
2302 id = jmeths[idnum+1]; // Look up the id (may be NULL)
2303 }
2304 return id;
2305 }
2306
2307 inline DependencyContext InstanceKlass::dependencies() {
2308 DependencyContext dep_context(&_dep_context, &_dep_context_last_cleaned);
2309 return dep_context;
2310 }
2311
2312 int InstanceKlass::mark_dependent_nmethods(KlassDepChange& changes) {
2313 return dependencies().mark_dependent_nmethods(changes);
2314 }
2315
2316 void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
2317 dependencies().add_dependent_nmethod(nm);
2318 }
2319
2320 void InstanceKlass::remove_dependent_nmethod(nmethod* nm) {
2321 dependencies().remove_dependent_nmethod(nm);
2322 }
2323
2324 void InstanceKlass::clean_dependency_context() {
2325 dependencies().clean_unloading_dependents();
2326 }
2327
2328 #ifndef PRODUCT
2329 void InstanceKlass::print_dependent_nmethods(bool verbose) {
2330 dependencies().print_dependent_nmethods(verbose);
2331 }
2332
2333 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
2334 return dependencies().is_dependent_nmethod(nm);
2335 }
2336 #endif //PRODUCT
2337
2338 void InstanceKlass::clean_weak_instanceklass_links() {
2339 clean_implementors_list();
2340 clean_method_data();
2341 }
2342
2343 void InstanceKlass::clean_implementors_list() {
2344 assert(is_loader_alive(), "this klass should be live");
2345 if (is_interface()) {
2346 assert (ClassUnloading, "only called for ClassUnloading");
2347 for (;;) {
2348 // Use load_acquire due to competing with inserts
2349 Klass* impl = Atomic::load_acquire(adr_implementor());
2350 if (impl != NULL && !impl->is_loader_alive()) {
2351 // NULL this field, might be an unloaded klass or NULL
2352 Klass* volatile* klass = adr_implementor();
2353 if (Atomic::cmpxchg(klass, impl, (Klass*)NULL) == impl) {
2354 // Successfully unlinking implementor.
2355 if (log_is_enabled(Trace, class, unload)) {
2356 ResourceMark rm;
2357 log_trace(class, unload)("unlinking class (implementor): %s", impl->external_name());
2358 }
2359 return;
2360 }
2361 } else {
2362 return;
2363 }
2364 }
2365 }
2366 }
2367
2368 void InstanceKlass::clean_method_data() {
2369 for (int m = 0; m < methods()->length(); m++) {
2370 MethodData* mdo = methods()->at(m)->method_data();
2371 if (mdo != NULL) {
2372 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : mdo->extra_data_lock());
2373 mdo->clean_method_data(/*always_clean*/false);
2374 }
2375 }
2376 }
2377
2378 bool InstanceKlass::supers_have_passed_fingerprint_checks() {
2379 if (java_super() != NULL && !java_super()->has_passed_fingerprint_check()) {
2380 ResourceMark rm;
2381 log_trace(class, fingerprint)("%s : super %s not fingerprinted", external_name(), java_super()->external_name());
2382 return false;
2383 }
2384
2385 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
2386 if (local_interfaces != NULL) {
2387 int length = local_interfaces->length();
2388 for (int i = 0; i < length; i++) {
2389 InstanceKlass* intf = local_interfaces->at(i);
2390 if (!intf->has_passed_fingerprint_check()) {
2391 ResourceMark rm;
2392 log_trace(class, fingerprint)("%s : interface %s not fingerprinted", external_name(), intf->external_name());
2393 return false;
2394 }
2395 }
2396 }
2397
2398 return true;
2399 }
2400
2401 bool InstanceKlass::should_store_fingerprint(bool is_hidden_or_anonymous) {
2402 #if INCLUDE_AOT
2403 // We store the fingerprint into the InstanceKlass only in the following 2 cases:
2404 if (CalculateClassFingerprint) {
2405 // (1) We are running AOT to generate a shared library.
2406 return true;
2407 }
2408 if (Arguments::is_dumping_archive()) {
2409 // (2) We are running -Xshare:dump or -XX:ArchiveClassesAtExit to create a shared archive
2410 return true;
2411 }
2412 if (UseAOT && is_hidden_or_anonymous) {
2413 // (3) We are using AOT code from a shared library and see a hidden or unsafe anonymous class
2414 return true;
2415 }
2416 #endif
2417
2418 // In all other cases we might set the _misc_has_passed_fingerprint_check bit,
2419 // but do not store the 64-bit fingerprint to save space.
2420 return false;
2421 }
2422
2423 bool InstanceKlass::has_stored_fingerprint() const {
2424 #if INCLUDE_AOT
2425 return should_store_fingerprint() || is_shared();
2426 #else
2427 return false;
2428 #endif
2429 }
2430
2431 uint64_t InstanceKlass::get_stored_fingerprint() const {
2432 address adr = adr_fingerprint();
2433 if (adr != NULL) {
2434 return (uint64_t)Bytes::get_native_u8(adr); // adr may not be 64-bit aligned
2435 }
2436 return 0;
2437 }
2438
2439 void InstanceKlass::store_fingerprint(uint64_t fingerprint) {
2440 address adr = adr_fingerprint();
2441 if (adr != NULL) {
2442 Bytes::put_native_u8(adr, (u8)fingerprint); // adr may not be 64-bit aligned
2443
2444 ResourceMark rm;
2445 log_trace(class, fingerprint)("stored as " PTR64_FORMAT " for class %s", fingerprint, external_name());
2446 }
2447 }
2448
2449 void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) {
2450 Klass::metaspace_pointers_do(it);
2451
2452 if (log_is_enabled(Trace, cds)) {
2453 ResourceMark rm;
2454 log_trace(cds)("Iter(InstanceKlass): %p (%s)", this, external_name());
2455 }
2456
2457 it->push(&_annotations);
2458 it->push((Klass**)&_array_klasses);
2459 it->push(&_constants);
2460 it->push(&_inner_classes);
2461 #if INCLUDE_JVMTI
2462 it->push(&_previous_versions);
2463 #endif
2464 it->push(&_methods);
2465 it->push(&_default_methods);
2466 it->push(&_local_interfaces);
2467 it->push(&_transitive_interfaces);
2468 it->push(&_method_ordering);
2469 it->push(&_default_vtable_indices);
2470 it->push(&_fields);
2471
2472 if (itable_length() > 0) {
2473 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2474 int method_table_offset_in_words = ioe->offset()/wordSize;
2475 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
2476 / itableOffsetEntry::size();
2477
2478 for (int i = 0; i < nof_interfaces; i ++, ioe ++) {
2479 if (ioe->interface_klass() != NULL) {
2480 it->push(ioe->interface_klass_addr());
2481 itableMethodEntry* ime = ioe->first_method_entry(this);
2482 int n = klassItable::method_count_for_interface(ioe->interface_klass());
2483 for (int index = 0; index < n; index ++) {
2484 it->push(ime[index].method_addr());
2485 }
2486 }
2487 }
2488 }
2489
2490 it->push(&_nest_members);
2491 it->push(&_permitted_subclasses);
2492 it->push(&_record_components);
2493 }
2494
2495 void InstanceKlass::remove_unshareable_info() {
2496 Klass::remove_unshareable_info();
2497
2498 if (SystemDictionaryShared::has_class_failed_verification(this)) {
2499 // Classes are attempted to link during dumping and may fail,
2500 // but these classes are still in the dictionary and class list in CLD.
2501 // If the class has failed verification, there is nothing else to remove.
2502 return;
2503 }
2504
2505 // Reset to the 'allocated' state to prevent any premature accessing to
2506 // a shared class at runtime while the class is still being loaded and
2507 // restored. A class' init_state is set to 'loaded' at runtime when it's
2508 // being added to class hierarchy (see SystemDictionary:::add_to_hierarchy()).
2509 _init_state = allocated;
2510
2511 { // Otherwise this needs to take out the Compile_lock.
2512 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
2513 init_implementor();
2514 }
2515
2516 constants()->remove_unshareable_info();
2517
2518 for (int i = 0; i < methods()->length(); i++) {
2519 Method* m = methods()->at(i);
2520 m->remove_unshareable_info();
2521 }
2522
2523 // do array classes also.
2524 if (array_klasses() != NULL) {
2525 array_klasses()->remove_unshareable_info();
2526 }
2527
2528 // These are not allocated from metaspace. They are safe to set to NULL.
2529 _source_debug_extension = NULL;
2530 _dep_context = NULL;
2531 _osr_nmethods_head = NULL;
2532 #if INCLUDE_JVMTI
2533 _breakpoints = NULL;
2534 _previous_versions = NULL;
2535 _cached_class_file = NULL;
2536 _jvmti_cached_class_field_map = NULL;
2537 #endif
2538
2539 _init_thread = NULL;
2540 _methods_jmethod_ids = NULL;
2541 _jni_ids = NULL;
2542 _oop_map_cache = NULL;
2543 // clear _nest_host to ensure re-load at runtime
2544 _nest_host = NULL;
2545 _package_entry = NULL; // TODO -- point it to the archived PackageEntry (JDK-8249262)
2546 _dep_context_last_cleaned = 0;
2547 }
2548
2549 void InstanceKlass::remove_java_mirror() {
2550 Klass::remove_java_mirror();
2551
2552 // do array classes also.
2553 if (array_klasses() != NULL) {
2554 array_klasses()->remove_java_mirror();
2555 }
2556 }
2557
2558 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain,
2559 PackageEntry* pkg_entry, TRAPS) {
2560 // SystemDictionary::add_to_hierarchy() sets the init_state to loaded
2561 // before the InstanceKlass is added to the SystemDictionary. Make
2562 // sure the current state is <loaded.
2563 assert(!is_loaded(), "invalid init state");
2564 set_package(loader_data, pkg_entry, CHECK);
2565 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
2566
2567 Array<Method*>* methods = this->methods();
2568 int num_methods = methods->length();
2569 for (int index = 0; index < num_methods; ++index) {
2570 methods->at(index)->restore_unshareable_info(CHECK);
2571 }
2572 if (JvmtiExport::has_redefined_a_class()) {
2573 // Reinitialize vtable because RedefineClasses may have changed some
2574 // entries in this vtable for super classes so the CDS vtable might
2575 // point to old or obsolete entries. RedefineClasses doesn't fix up
2576 // vtables in the shared system dictionary, only the main one.
2577 // It also redefines the itable too so fix that too.
2578 vtable().initialize_vtable(false, CHECK);
2579 itable().initialize_itable(false, CHECK);
2580 }
2581
2582 // restore constant pool resolved references
2583 constants()->restore_unshareable_info(CHECK);
2584
2585 if (array_klasses() != NULL) {
2586 // Array classes have null protection domain.
2587 // --> see ArrayKlass::complete_create_array_klass()
2588 array_klasses()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
2589 }
2590
2591 // Initialize current biased locking state.
2592 if (UseBiasedLocking && BiasedLocking::enabled()) {
2593 set_prototype_header(markWord::biased_locking_prototype());
2594 }
2595 }
2596
2597 void InstanceKlass::set_shared_class_loader_type(s2 loader_type) {
2598 switch (loader_type) {
2599 case ClassLoader::BOOT_LOADER:
2600 _misc_flags |= _misc_is_shared_boot_class;
2601 break;
2602 case ClassLoader::PLATFORM_LOADER:
2603 _misc_flags |= _misc_is_shared_platform_class;
2604 break;
2605 case ClassLoader::APP_LOADER:
2606 _misc_flags |= _misc_is_shared_app_class;
2607 break;
2608 default:
2609 ShouldNotReachHere();
2610 break;
2611 }
2612 }
2613
2614 void InstanceKlass::assign_class_loader_type() {
2615 ClassLoaderData *cld = class_loader_data();
2616 if (cld->is_boot_class_loader_data()) {
2617 set_shared_class_loader_type(ClassLoader::BOOT_LOADER);
2618 }
2619 else if (cld->is_platform_class_loader_data()) {
2620 set_shared_class_loader_type(ClassLoader::PLATFORM_LOADER);
2621 }
2622 else if (cld->is_system_class_loader_data()) {
2623 set_shared_class_loader_type(ClassLoader::APP_LOADER);
2624 }
2625 }
2626
2627 #if INCLUDE_JVMTI
2628 static void clear_all_breakpoints(Method* m) {
2629 m->clear_all_breakpoints();
2630 }
2631 #endif
2632
2633 void InstanceKlass::unload_class(InstanceKlass* ik) {
2634 // Release dependencies.
2635 ik->dependencies().remove_all_dependents();
2636
2637 // notify the debugger
2638 if (JvmtiExport::should_post_class_unload()) {
2639 JvmtiExport::post_class_unload(ik);
2640 }
2641
2642 // notify ClassLoadingService of class unload
2643 ClassLoadingService::notify_class_unloaded(ik);
2644
2645 if (Arguments::is_dumping_archive()) {
2646 SystemDictionaryShared::remove_dumptime_info(ik);
2647 }
2648
2649 if (log_is_enabled(Info, class, unload)) {
2650 ResourceMark rm;
2651 log_info(class, unload)("unloading class %s " INTPTR_FORMAT, ik->external_name(), p2i(ik));
2652 }
2653
2654 Events::log_class_unloading(Thread::current(), ik);
2655
2656 #if INCLUDE_JFR
2657 assert(ik != NULL, "invariant");
2658 EventClassUnload event;
2659 event.set_unloadedClass(ik);
2660 event.set_definingClassLoader(ik->class_loader_data());
2661 event.commit();
2662 #endif
2663 }
2664
2665 static void method_release_C_heap_structures(Method* m) {
2666 m->release_C_heap_structures();
2667 }
2668
2669 void InstanceKlass::release_C_heap_structures() {
2670
2671 // Clean up C heap
2672 release_C_heap_structures_internal();
2673 constants()->release_C_heap_structures();
2674
2675 // Deallocate and call destructors for MDO mutexes
2676 methods_do(method_release_C_heap_structures);
2677 }
2678
2679 void InstanceKlass::release_C_heap_structures_internal() {
2680 Klass::release_C_heap_structures();
2681
2682 // Can't release the constant pool here because the constant pool can be
2683 // deallocated separately from the InstanceKlass for default methods and
2684 // redefine classes.
2685
2686 // Deallocate oop map cache
2687 if (_oop_map_cache != NULL) {
2688 delete _oop_map_cache;
2689 _oop_map_cache = NULL;
2690 }
2691
2692 // Deallocate JNI identifiers for jfieldIDs
2693 JNIid::deallocate(jni_ids());
2694 set_jni_ids(NULL);
2695
2696 jmethodID* jmeths = methods_jmethod_ids_acquire();
2697 if (jmeths != (jmethodID*)NULL) {
2698 release_set_methods_jmethod_ids(NULL);
2699 FreeHeap(jmeths);
2700 }
2701
2702 assert(_dep_context == NULL,
2703 "dependencies should already be cleaned");
2704
2705 #if INCLUDE_JVMTI
2706 // Deallocate breakpoint records
2707 if (breakpoints() != 0x0) {
2708 methods_do(clear_all_breakpoints);
2709 assert(breakpoints() == 0x0, "should have cleared breakpoints");
2710 }
2711
2712 // deallocate the cached class file
2713 if (_cached_class_file != NULL) {
2714 os::free(_cached_class_file);
2715 _cached_class_file = NULL;
2716 }
2717 #endif
2718
2719 FREE_C_HEAP_ARRAY(char, _source_debug_extension);
2720 }
2721
2722 void InstanceKlass::set_source_debug_extension(const char* array, int length) {
2723 if (array == NULL) {
2724 _source_debug_extension = NULL;
2725 } else {
2726 // Adding one to the attribute length in order to store a null terminator
2727 // character could cause an overflow because the attribute length is
2728 // already coded with an u4 in the classfile, but in practice, it's
2729 // unlikely to happen.
2730 assert((length+1) > length, "Overflow checking");
2731 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
2732 for (int i = 0; i < length; i++) {
2733 sde[i] = array[i];
2734 }
2735 sde[length] = '\0';
2736 _source_debug_extension = sde;
2737 }
2738 }
2739
2740 const char* InstanceKlass::signature_name() const {
2741 int hash_len = 0;
2742 char hash_buf[40];
2743
2744 // If this is an unsafe anonymous class, append a hash to make the name unique
2745 if (is_unsafe_anonymous()) {
2746 intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0;
2747 jio_snprintf(hash_buf, sizeof(hash_buf), "/" UINTX_FORMAT, (uintx)hash);
2748 hash_len = (int)strlen(hash_buf);
2749 }
2750
2751 // Get the internal name as a c string
2752 const char* src = (const char*) (name()->as_C_string());
2753 const int src_length = (int)strlen(src);
2754
2755 char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3);
2756
2757 // Add L as type indicator
2758 int dest_index = 0;
2759 dest[dest_index++] = JVM_SIGNATURE_CLASS;
2760
2761 // Add the actual class name
2762 for (int src_index = 0; src_index < src_length; ) {
2763 dest[dest_index++] = src[src_index++];
2764 }
2765
2766 if (is_hidden()) { // Replace the last '+' with a '.'.
2767 for (int index = (int)src_length; index > 0; index--) {
2768 if (dest[index] == '+') {
2769 dest[index] = JVM_SIGNATURE_DOT;
2770 break;
2771 }
2772 }
2773 }
2774
2775 // If we have a hash, append it
2776 for (int hash_index = 0; hash_index < hash_len; ) {
2777 dest[dest_index++] = hash_buf[hash_index++];
2778 }
2779
2780 // Add the semicolon and the NULL
2781 dest[dest_index++] = JVM_SIGNATURE_ENDCLASS;
2782 dest[dest_index] = '\0';
2783 return dest;
2784 }
2785
2786 ModuleEntry* InstanceKlass::module() const {
2787 // For an unsafe anonymous class return the host class' module
2788 if (is_unsafe_anonymous()) {
2789 assert(unsafe_anonymous_host() != NULL, "unsafe anonymous class must have a host class");
2790 return unsafe_anonymous_host()->module();
2791 }
2792
2793 if (is_hidden() &&
2794 in_unnamed_package() &&
2795 class_loader_data()->has_class_mirror_holder()) {
2796 // For a non-strong hidden class defined to an unnamed package,
2797 // its (class held) CLD will not have an unnamed module created for it.
2798 // Two choices to find the correct ModuleEntry:
2799 // 1. If hidden class is within a nest, use nest host's module
2800 // 2. Find the unnamed module off from the class loader
2801 // For now option #2 is used since a nest host is not set until
2802 // after the instance class is created in jvm_lookup_define_class().
2803 if (class_loader_data()->is_boot_class_loader_data()) {
2804 return ClassLoaderData::the_null_class_loader_data()->unnamed_module();
2805 } else {
2806 oop module = java_lang_ClassLoader::unnamedModule(class_loader_data()->class_loader());
2807 assert(java_lang_Module::is_instance(module), "Not an instance of java.lang.Module");
2808 return java_lang_Module::module_entry(module);
2809 }
2810 }
2811
2812 // Class is in a named package
2813 if (!in_unnamed_package()) {
2814 return _package_entry->module();
2815 }
2816
2817 // Class is in an unnamed package, return its loader's unnamed module
2818 return class_loader_data()->unnamed_module();
2819 }
2820
2821 void InstanceKlass::set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS) {
2822
2823 // ensure java/ packages only loaded by boot or platform builtin loaders
2824 // not needed for shared class since CDS does not archive prohibited classes.
2825 if (!is_shared()) {
2826 check_prohibited_package(name(), loader_data, CHECK);
2827 }
2828
2829 // ClassLoader::package_from_class_name has already incremented the refcount of the symbol
2830 // it returns, so we need to decrement it when the current function exits.
2831 TempNewSymbol from_class_name =
2832 (pkg_entry != NULL) ? NULL : ClassLoader::package_from_class_name(name());
2833
2834 Symbol* pkg_name;
2835 if (pkg_entry != NULL) {
2836 pkg_name = pkg_entry->name();
2837 } else {
2838 pkg_name = from_class_name;
2839 }
2840
2841 if (pkg_name != NULL && loader_data != NULL) {
2842
2843 // Find in class loader's package entry table.
2844 _package_entry = pkg_entry != NULL ? pkg_entry : loader_data->packages()->lookup_only(pkg_name);
2845
2846 // If the package name is not found in the loader's package
2847 // entry table, it is an indication that the package has not
2848 // been defined. Consider it defined within the unnamed module.
2849 if (_package_entry == NULL) {
2850
2851 if (!ModuleEntryTable::javabase_defined()) {
2852 // Before java.base is defined during bootstrapping, define all packages in
2853 // the java.base module. If a non-java.base package is erroneously placed
2854 // in the java.base module it will be caught later when java.base
2855 // is defined by ModuleEntryTable::verify_javabase_packages check.
2856 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, JAVA_BASE_NAME " module is NULL");
2857 _package_entry = loader_data->packages()->lookup(pkg_name, ModuleEntryTable::javabase_moduleEntry());
2858 } else {
2859 assert(loader_data->unnamed_module() != NULL, "unnamed module is NULL");
2860 _package_entry = loader_data->packages()->lookup(pkg_name,
2861 loader_data->unnamed_module());
2862 }
2863
2864 // A package should have been successfully created
2865 DEBUG_ONLY(ResourceMark rm(THREAD));
2866 assert(_package_entry != NULL, "Package entry for class %s not found, loader %s",
2867 name()->as_C_string(), loader_data->loader_name_and_id());
2868 }
2869
2870 if (log_is_enabled(Debug, module)) {
2871 ResourceMark rm(THREAD);
2872 ModuleEntry* m = _package_entry->module();
2873 log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s",
2874 external_name(),
2875 pkg_name->as_C_string(),
2876 loader_data->loader_name_and_id(),
2877 (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE));
2878 }
2879 } else {
2880 ResourceMark rm(THREAD);
2881 log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s",
2882 external_name(),
2883 (loader_data != NULL) ? loader_data->loader_name_and_id() : "NULL",
2884 UNNAMED_MODULE);
2885 }
2886 }
2887
2888 // Function set_classpath_index checks if the package of the InstanceKlass is in the
2889 // boot loader's package entry table. If so, then it sets the classpath_index
2890 // in the package entry record.
2891 //
2892 // The classpath_index field is used to find the entry on the boot loader class
2893 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
2894 // in an unnamed module. It is also used to indicate (for all packages whose
2895 // classes are loaded by the boot loader) that at least one of the package's
2896 // classes has been loaded.
2897 void InstanceKlass::set_classpath_index(s2 path_index, TRAPS) {
2898 if (_package_entry != NULL) {
2899 DEBUG_ONLY(PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();)
2900 assert(pkg_entry_tbl->lookup_only(_package_entry->name()) == _package_entry, "Should be same");
2901 assert(path_index != -1, "Unexpected classpath_index");
2902 _package_entry->set_classpath_index(path_index);
2903 }
2904 }
2905
2906 // different versions of is_same_class_package
2907
2908 bool InstanceKlass::is_same_class_package(const Klass* class2) const {
2909 oop classloader1 = this->class_loader();
2910 PackageEntry* classpkg1 = this->package();
2911 if (class2->is_objArray_klass()) {
2912 class2 = ObjArrayKlass::cast(class2)->bottom_klass();
2913 }
2914
2915 oop classloader2;
2916 PackageEntry* classpkg2;
2917 if (class2->is_instance_klass()) {
2918 classloader2 = class2->class_loader();
2919 classpkg2 = class2->package();
2920 } else {
2921 assert(class2->is_typeArray_klass(), "should be type array");
2922 classloader2 = NULL;
2923 classpkg2 = NULL;
2924 }
2925
2926 // Same package is determined by comparing class loader
2927 // and package entries. Both must be the same. This rule
2928 // applies even to classes that are defined in the unnamed
2929 // package, they still must have the same class loader.
2930 if ((classloader1 == classloader2) && (classpkg1 == classpkg2)) {
2931 return true;
2932 }
2933
2934 return false;
2935 }
2936
2937 // return true if this class and other_class are in the same package. Classloader
2938 // and classname information is enough to determine a class's package
2939 bool InstanceKlass::is_same_class_package(oop other_class_loader,
2940 const Symbol* other_class_name) const {
2941 if (class_loader() != other_class_loader) {
2942 return false;
2943 }
2944 if (name()->fast_compare(other_class_name) == 0) {
2945 return true;
2946 }
2947
2948 {
2949 ResourceMark rm;
2950
2951 bool bad_class_name = false;
2952 TempNewSymbol other_pkg = ClassLoader::package_from_class_name(other_class_name, &bad_class_name);
2953 if (bad_class_name) {
2954 return false;
2955 }
2956 // Check that package_from_class_name() returns NULL, not "", if there is no package.
2957 assert(other_pkg == NULL || other_pkg->utf8_length() > 0, "package name is empty string");
2958
2959 const Symbol* const this_package_name =
2960 this->package() != NULL ? this->package()->name() : NULL;
2961
2962 if (this_package_name == NULL || other_pkg == NULL) {
2963 // One of the two doesn't have a package. Only return true if the other
2964 // one also doesn't have a package.
2965 return this_package_name == other_pkg;
2966 }
2967
2968 // Check if package is identical
2969 return this_package_name->fast_compare(other_pkg) == 0;
2970 }
2971 }
2972
2973 // Returns true iff super_method can be overridden by a method in targetclassname
2974 // See JLS 3rd edition 8.4.6.1
2975 // Assumes name-signature match
2976 // "this" is InstanceKlass of super_method which must exist
2977 // note that the InstanceKlass of the method in the targetclassname has not always been created yet
2978 bool InstanceKlass::is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) {
2979 // Private methods can not be overridden
2980 if (super_method->is_private()) {
2981 return false;
2982 }
2983 // If super method is accessible, then override
2984 if ((super_method->is_protected()) ||
2985 (super_method->is_public())) {
2986 return true;
2987 }
2988 // Package-private methods are not inherited outside of package
2989 assert(super_method->is_package_private(), "must be package private");
2990 return(is_same_class_package(targetclassloader(), targetclassname));
2991 }
2992
2993 // Only boot and platform class loaders can define classes in "java/" packages.
2994 void InstanceKlass::check_prohibited_package(Symbol* class_name,
2995 ClassLoaderData* loader_data,
2996 TRAPS) {
2997 if (!loader_data->is_boot_class_loader_data() &&
2998 !loader_data->is_platform_class_loader_data() &&
2999 class_name != NULL) {
3000 ResourceMark rm(THREAD);
3001 char* name = class_name->as_C_string();
3002 if (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/') {
3003 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name);
3004 assert(pkg_name != NULL, "Error in parsing package name starting with 'java/'");
3005 name = pkg_name->as_C_string();
3006 const char* class_loader_name = loader_data->loader_name_and_id();
3007 StringUtils::replace_no_expand(name, "/", ".");
3008 const char* msg_text1 = "Class loader (instance of): ";
3009 const char* msg_text2 = " tried to load prohibited package name: ";
3010 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1;
3011 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
3012 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name);
3013 THROW_MSG(vmSymbols::java_lang_SecurityException(), message);
3014 }
3015 }
3016 return;
3017 }
3018
3019 bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const {
3020 constantPoolHandle i_cp(THREAD, constants());
3021 for (InnerClassesIterator iter(this); !iter.done(); iter.next()) {
3022 int ioff = iter.inner_class_info_index();
3023 if (ioff != 0) {
3024 // Check to see if the name matches the class we're looking for
3025 // before attempting to find the class.
3026 if (i_cp->klass_name_at_matches(this, ioff)) {
3027 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false);
3028 if (this == inner_klass) {
3029 *ooff = iter.outer_class_info_index();
3030 *noff = iter.inner_name_index();
3031 return true;
3032 }
3033 }
3034 }
3035 }
3036 return false;
3037 }
3038
3039 InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const {
3040 InstanceKlass* outer_klass = NULL;
3041 *inner_is_member = false;
3042 int ooff = 0, noff = 0;
3043 bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD);
3044 if (has_inner_classes_attr) {
3045 constantPoolHandle i_cp(THREAD, constants());
3046 if (ooff != 0) {
3047 Klass* ok = i_cp->klass_at(ooff, CHECK_NULL);
3048 outer_klass = InstanceKlass::cast(ok);
3049 *inner_is_member = true;
3050 }
3051 if (NULL == outer_klass) {
3052 // It may be a local or anonymous class; try for that.
3053 int encl_method_class_idx = enclosing_method_class_index();
3054 if (encl_method_class_idx != 0) {
3055 Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
3056 outer_klass = InstanceKlass::cast(ok);
3057 *inner_is_member = false;
3058 }
3059 }
3060 }
3061
3062 // If no inner class attribute found for this class.
3063 if (NULL == outer_klass) return NULL;
3064
3065 // Throws an exception if outer klass has not declared k as an inner klass
3066 // We need evidence that each klass knows about the other, or else
3067 // the system could allow a spoof of an inner class to gain access rights.
3068 Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL);
3069 return outer_klass;
3070 }
3071
3072 jint InstanceKlass::compute_modifier_flags(TRAPS) const {
3073 jint access = access_flags().as_int();
3074
3075 // But check if it happens to be member class.
3076 InnerClassesIterator iter(this);
3077 for (; !iter.done(); iter.next()) {
3078 int ioff = iter.inner_class_info_index();
3079 // Inner class attribute can be zero, skip it.
3080 // Strange but true: JVM spec. allows null inner class refs.
3081 if (ioff == 0) continue;
3082
3083 // only look at classes that are already loaded
3084 // since we are looking for the flags for our self.
3085 Symbol* inner_name = constants()->klass_name_at(ioff);
3086 if (name() == inner_name) {
3087 // This is really a member class.
3088 access = iter.inner_access_flags();
3089 break;
3090 }
3091 }
3092 // Remember to strip ACC_SUPER bit
3093 return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS;
3094 }
3095
3096 jint InstanceKlass::jvmti_class_status() const {
3097 jint result = 0;
3098
3099 if (is_linked()) {
3100 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
3101 }
3102
3103 if (is_initialized()) {
3104 assert(is_linked(), "Class status is not consistent");
3105 result |= JVMTI_CLASS_STATUS_INITIALIZED;
3106 }
3107 if (is_in_error_state()) {
3108 result |= JVMTI_CLASS_STATUS_ERROR;
3109 }
3110 return result;
3111 }
3112
3113 Method* InstanceKlass::method_at_itable(Klass* holder, int index, TRAPS) {
3114 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
3115 int method_table_offset_in_words = ioe->offset()/wordSize;
3116 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
3117 / itableOffsetEntry::size();
3118
3119 for (int cnt = 0 ; ; cnt ++, ioe ++) {
3120 // If the interface isn't implemented by the receiver class,
3121 // the VM should throw IncompatibleClassChangeError.
3122 if (cnt >= nof_interfaces) {
3123 ResourceMark rm(THREAD);
3124 stringStream ss;
3125 bool same_module = (module() == holder->module());
3126 ss.print("Receiver class %s does not implement "
3127 "the interface %s defining the method to be called "
3128 "(%s%s%s)",
3129 external_name(), holder->external_name(),
3130 (same_module) ? joint_in_module_of_loader(holder) : class_in_module_of_loader(),
3131 (same_module) ? "" : "; ",
3132 (same_module) ? "" : holder->class_in_module_of_loader());
3133 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
3134 }
3135
3136 Klass* ik = ioe->interface_klass();
3137 if (ik == holder) break;
3138 }
3139
3140 itableMethodEntry* ime = ioe->first_method_entry(this);
3141 Method* m = ime[index].method();
3142 if (m == NULL) {
3143 THROW_NULL(vmSymbols::java_lang_AbstractMethodError());
3144 }
3145 return m;
3146 }
3147
3148
3149 #if INCLUDE_JVMTI
3150 // update default_methods for redefineclasses for methods that are
3151 // not yet in the vtable due to concurrent subclass define and superinterface
3152 // redefinition
3153 // Note: those in the vtable, should have been updated via adjust_method_entries
3154 void InstanceKlass::adjust_default_methods(bool* trace_name_printed) {
3155 // search the default_methods for uses of either obsolete or EMCP methods
3156 if (default_methods() != NULL) {
3157 for (int index = 0; index < default_methods()->length(); index ++) {
3158 Method* old_method = default_methods()->at(index);
3159 if (old_method == NULL || !old_method->is_old()) {
3160 continue; // skip uninteresting entries
3161 }
3162 assert(!old_method->is_deleted(), "default methods may not be deleted");
3163 Method* new_method = old_method->get_new_method();
3164 default_methods()->at_put(index, new_method);
3165
3166 if (log_is_enabled(Info, redefine, class, update)) {
3167 ResourceMark rm;
3168 if (!(*trace_name_printed)) {
3169 log_info(redefine, class, update)
3170 ("adjust: klassname=%s default methods from name=%s",
3171 external_name(), old_method->method_holder()->external_name());
3172 *trace_name_printed = true;
3173 }
3174 log_debug(redefine, class, update, vtables)
3175 ("default method update: %s(%s) ",
3176 new_method->name()->as_C_string(), new_method->signature()->as_C_string());
3177 }
3178 }
3179 }
3180 }
3181 #endif // INCLUDE_JVMTI
3182
3183 // On-stack replacement stuff
3184 void InstanceKlass::add_osr_nmethod(nmethod* n) {
3185 assert_lock_strong(CompiledMethod_lock);
3186 #ifndef PRODUCT
3187 if (TieredCompilation) {
3188 nmethod* prev = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), n->comp_level(), true);
3189 assert(prev == NULL || !prev->is_in_use() COMPILER2_PRESENT(|| StressRecompilation),
3190 "redundant OSR recompilation detected. memory leak in CodeCache!");
3191 }
3192 #endif
3193 // only one compilation can be active
3194 {
3195 assert(n->is_osr_method(), "wrong kind of nmethod");
3196 n->set_osr_link(osr_nmethods_head());
3197 set_osr_nmethods_head(n);
3198 // Raise the highest osr level if necessary
3199 if (TieredCompilation) {
3200 Method* m = n->method();
3201 m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level()));
3202 }
3203 }
3204
3205 // Get rid of the osr methods for the same bci that have lower levels.
3206 if (TieredCompilation) {
3207 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) {
3208 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true);
3209 if (inv != NULL && inv->is_in_use()) {
3210 inv->make_not_entrant();
3211 }
3212 }
3213 }
3214 }
3215
3216 // Remove osr nmethod from the list. Return true if found and removed.
3217 bool InstanceKlass::remove_osr_nmethod(nmethod* n) {
3218 // This is a short non-blocking critical region, so the no safepoint check is ok.
3219 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock
3220 , Mutex::_no_safepoint_check_flag);
3221 assert(n->is_osr_method(), "wrong kind of nmethod");
3222 nmethod* last = NULL;
3223 nmethod* cur = osr_nmethods_head();
3224 int max_level = CompLevel_none; // Find the max comp level excluding n
3225 Method* m = n->method();
3226 // Search for match
3227 bool found = false;
3228 while(cur != NULL && cur != n) {
3229 if (TieredCompilation && m == cur->method()) {
3230 // Find max level before n
3231 max_level = MAX2(max_level, cur->comp_level());
3232 }
3233 last = cur;
3234 cur = cur->osr_link();
3235 }
3236 nmethod* next = NULL;
3237 if (cur == n) {
3238 found = true;
3239 next = cur->osr_link();
3240 if (last == NULL) {
3241 // Remove first element
3242 set_osr_nmethods_head(next);
3243 } else {
3244 last->set_osr_link(next);
3245 }
3246 }
3247 n->set_osr_link(NULL);
3248 if (TieredCompilation) {
3249 cur = next;
3250 while (cur != NULL) {
3251 // Find max level after n
3252 if (m == cur->method()) {
3253 max_level = MAX2(max_level, cur->comp_level());
3254 }
3255 cur = cur->osr_link();
3256 }
3257 m->set_highest_osr_comp_level(max_level);
3258 }
3259 return found;
3260 }
3261
3262 int InstanceKlass::mark_osr_nmethods(const Method* m) {
3263 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock,
3264 Mutex::_no_safepoint_check_flag);
3265 nmethod* osr = osr_nmethods_head();
3266 int found = 0;
3267 while (osr != NULL) {
3268 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3269 if (osr->method() == m) {
3270 osr->mark_for_deoptimization();
3271 found++;
3272 }
3273 osr = osr->osr_link();
3274 }
3275 return found;
3276 }
3277
3278 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
3279 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock,
3280 Mutex::_no_safepoint_check_flag);
3281 nmethod* osr = osr_nmethods_head();
3282 nmethod* best = NULL;
3283 while (osr != NULL) {
3284 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3285 // There can be a time when a c1 osr method exists but we are waiting
3286 // for a c2 version. When c2 completes its osr nmethod we will trash
3287 // the c1 version and only be able to find the c2 version. However
3288 // while we overflow in the c1 code at back branches we don't want to
3289 // try and switch to the same code as we are already running
3290
3291 if (osr->method() == m &&
3292 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
3293 if (match_level) {
3294 if (osr->comp_level() == comp_level) {
3295 // Found a match - return it.
3296 return osr;
3297 }
3298 } else {
3299 if (best == NULL || (osr->comp_level() > best->comp_level())) {
3300 if (osr->comp_level() == CompLevel_highest_tier) {
3301 // Found the best possible - return it.
3302 return osr;
3303 }
3304 best = osr;
3305 }
3306 }
3307 }
3308 osr = osr->osr_link();
3309 }
3310
3311 assert(match_level == false || best == NULL, "shouldn't pick up anything if match_level is set");
3312 if (best != NULL && best->comp_level() >= comp_level) {
3313 return best;
3314 }
3315 return NULL;
3316 }
3317
3318 // -----------------------------------------------------------------------------------------------------
3319 // Printing
3320
3321 #ifndef PRODUCT
3322
3323 #define BULLET " - "
3324
3325 static const char* state_names[] = {
3326 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
3327 };
3328
3329 static void print_vtable(intptr_t* start, int len, outputStream* st) {
3330 for (int i = 0; i < len; i++) {
3331 intptr_t e = start[i];
3332 st->print("%d : " INTPTR_FORMAT, i, e);
3333 if (MetaspaceObj::is_valid((Metadata*)e)) {
3334 st->print(" ");
3335 ((Metadata*)e)->print_value_on(st);
3336 }
3337 st->cr();
3338 }
3339 }
3340
3341 static void print_vtable(vtableEntry* start, int len, outputStream* st) {
3342 return print_vtable(reinterpret_cast<intptr_t*>(start), len, st);
3343 }
3344
3345 void InstanceKlass::print_on(outputStream* st) const {
3346 assert(is_klass(), "must be klass");
3347 Klass::print_on(st);
3348
3349 st->print(BULLET"instance size: %d", size_helper()); st->cr();
3350 st->print(BULLET"klass size: %d", size()); st->cr();
3351 st->print(BULLET"access: "); access_flags().print_on(st); st->cr();
3352 st->print(BULLET"state: "); st->print_cr("%s", state_names[_init_state]);
3353 st->print(BULLET"name: "); name()->print_value_on(st); st->cr();
3354 st->print(BULLET"super: "); Metadata::print_value_on_maybe_null(st, super()); st->cr();
3355 st->print(BULLET"sub: ");
3356 Klass* sub = subklass();
3357 int n;
3358 for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) {
3359 if (n < MaxSubklassPrintSize) {
3360 sub->print_value_on(st);
3361 st->print(" ");
3362 }
3363 }
3364 if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize);
3365 st->cr();
3366
3367 if (is_interface()) {
3368 st->print_cr(BULLET"nof implementors: %d", nof_implementors());
3369 if (nof_implementors() == 1) {
3370 st->print_cr(BULLET"implementor: ");
3371 st->print(" ");
3372 implementor()->print_value_on(st);
3373 st->cr();
3374 }
3375 }
3376
3377 st->print(BULLET"arrays: "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr();
3378 st->print(BULLET"methods: "); methods()->print_value_on(st); st->cr();
3379 if (Verbose || WizardMode) {
3380 Array<Method*>* method_array = methods();
3381 for (int i = 0; i < method_array->length(); i++) {
3382 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3383 }
3384 }
3385 st->print(BULLET"method ordering: "); method_ordering()->print_value_on(st); st->cr();
3386 st->print(BULLET"default_methods: "); default_methods()->print_value_on(st); st->cr();
3387 if (Verbose && default_methods() != NULL) {
3388 Array<Method*>* method_array = default_methods();
3389 for (int i = 0; i < method_array->length(); i++) {
3390 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3391 }
3392 }
3393 if (default_vtable_indices() != NULL) {
3394 st->print(BULLET"default vtable indices: "); default_vtable_indices()->print_value_on(st); st->cr();
3395 }
3396 st->print(BULLET"local interfaces: "); local_interfaces()->print_value_on(st); st->cr();
3397 st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr();
3398 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr();
3399 if (class_loader_data() != NULL) {
3400 st->print(BULLET"class loader data: ");
3401 class_loader_data()->print_value_on(st);
3402 st->cr();
3403 }
3404 st->print(BULLET"unsafe anonymous host class: "); Metadata::print_value_on_maybe_null(st, unsafe_anonymous_host()); st->cr();
3405 if (source_file_name() != NULL) {
3406 st->print(BULLET"source file: ");
3407 source_file_name()->print_value_on(st);
3408 st->cr();
3409 }
3410 if (source_debug_extension() != NULL) {
3411 st->print(BULLET"source debug extension: ");
3412 st->print("%s", source_debug_extension());
3413 st->cr();
3414 }
3415 st->print(BULLET"class annotations: "); class_annotations()->print_value_on(st); st->cr();
3416 st->print(BULLET"class type annotations: "); class_type_annotations()->print_value_on(st); st->cr();
3417 st->print(BULLET"field annotations: "); fields_annotations()->print_value_on(st); st->cr();
3418 st->print(BULLET"field type annotations: "); fields_type_annotations()->print_value_on(st); st->cr();
3419 {
3420 bool have_pv = false;
3421 // previous versions are linked together through the InstanceKlass
3422 for (InstanceKlass* pv_node = previous_versions();
3423 pv_node != NULL;
3424 pv_node = pv_node->previous_versions()) {
3425 if (!have_pv)
3426 st->print(BULLET"previous version: ");
3427 have_pv = true;
3428 pv_node->constants()->print_value_on(st);
3429 }
3430 if (have_pv) st->cr();
3431 }
3432
3433 if (generic_signature() != NULL) {
3434 st->print(BULLET"generic signature: ");
3435 generic_signature()->print_value_on(st);
3436 st->cr();
3437 }
3438 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr();
3439 st->print(BULLET"nest members: "); nest_members()->print_value_on(st); st->cr();
3440 if (record_components() != NULL) {
3441 st->print(BULLET"record components: "); record_components()->print_value_on(st); st->cr();
3442 }
3443 st->print(BULLET"permitted subclasses: "); permitted_subclasses()->print_value_on(st); st->cr();
3444 if (java_mirror() != NULL) {
3445 st->print(BULLET"java mirror: ");
3446 java_mirror()->print_value_on(st);
3447 st->cr();
3448 } else {
3449 st->print_cr(BULLET"java mirror: NULL");
3450 }
3451 st->print(BULLET"vtable length %d (start addr: " INTPTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
3452 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st);
3453 st->print(BULLET"itable length %d (start addr: " INTPTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
3454 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_itable(), itable_length(), st);
3455 st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
3456 FieldPrinter print_static_field(st);
3457 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
3458 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
3459 FieldPrinter print_nonstatic_field(st);
3460 InstanceKlass* ik = const_cast<InstanceKlass*>(this);
3461 ik->do_nonstatic_fields(&print_nonstatic_field);
3462
3463 st->print(BULLET"non-static oop maps: ");
3464 OopMapBlock* map = start_of_nonstatic_oop_maps();
3465 OopMapBlock* end_map = map + nonstatic_oop_map_count();
3466 while (map < end_map) {
3467 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
3468 map++;
3469 }
3470 st->cr();
3471 }
3472
3473 #endif //PRODUCT
3474
3475 void InstanceKlass::print_value_on(outputStream* st) const {
3476 assert(is_klass(), "must be klass");
3477 if (Verbose || WizardMode) access_flags().print_on(st);
3478 name()->print_value_on(st);
3479 }
3480
3481 #ifndef PRODUCT
3482
3483 void FieldPrinter::do_field(fieldDescriptor* fd) {
3484 _st->print(BULLET);
3485 if (_obj == NULL) {
3486 fd->print_on(_st);
3487 _st->cr();
3488 } else {
3489 fd->print_on_for(_st, _obj);
3490 _st->cr();
3491 }
3492 }
3493
3494
3495 void InstanceKlass::oop_print_on(oop obj, outputStream* st) {
3496 Klass::oop_print_on(obj, st);
3497
3498 if (this == SystemDictionary::String_klass()) {
3499 typeArrayOop value = java_lang_String::value(obj);
3500 juint length = java_lang_String::length(obj);
3501 if (value != NULL &&
3502 value->is_typeArray() &&
3503 length <= (juint) value->length()) {
3504 st->print(BULLET"string: ");
3505 java_lang_String::print(obj, st);
3506 st->cr();
3507 if (!WizardMode) return; // that is enough
3508 }
3509 }
3510
3511 st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj));
3512 FieldPrinter print_field(st, obj);
3513 do_nonstatic_fields(&print_field);
3514
3515 if (this == SystemDictionary::Class_klass()) {
3516 st->print(BULLET"signature: ");
3517 java_lang_Class::print_signature(obj, st);
3518 st->cr();
3519 Klass* mirrored_klass = java_lang_Class::as_Klass(obj);
3520 st->print(BULLET"fake entry for mirror: ");
3521 Metadata::print_value_on_maybe_null(st, mirrored_klass);
3522 st->cr();
3523 Klass* array_klass = java_lang_Class::array_klass_acquire(obj);
3524 st->print(BULLET"fake entry for array: ");
3525 Metadata::print_value_on_maybe_null(st, array_klass);
3526 st->cr();
3527 st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj));
3528 st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj));
3529 Klass* real_klass = java_lang_Class::as_Klass(obj);
3530 if (real_klass != NULL && real_klass->is_instance_klass()) {
3531 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
3532 }
3533 } else if (this == SystemDictionary::MethodType_klass()) {
3534 st->print(BULLET"signature: ");
3535 java_lang_invoke_MethodType::print_signature(obj, st);
3536 st->cr();
3537 }
3538 }
3539
3540 bool InstanceKlass::verify_itable_index(int i) {
3541 int method_count = klassItable::method_count_for_interface(this);
3542 assert(i >= 0 && i < method_count, "index out of bounds");
3543 return true;
3544 }
3545
3546 #endif //PRODUCT
3547
3548 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
3549 st->print("a ");
3550 name()->print_value_on(st);
3551 obj->print_address_on(st);
3552 if (this == SystemDictionary::String_klass()
3553 && java_lang_String::value(obj) != NULL) {
3554 ResourceMark rm;
3555 int len = java_lang_String::length(obj);
3556 int plen = (len < 24 ? len : 12);
3557 char* str = java_lang_String::as_utf8_string(obj, 0, plen);
3558 st->print(" = \"%s\"", str);
3559 if (len > plen)
3560 st->print("...[%d]", len);
3561 } else if (this == SystemDictionary::Class_klass()) {
3562 Klass* k = java_lang_Class::as_Klass(obj);
3563 st->print(" = ");
3564 if (k != NULL) {
3565 k->print_value_on(st);
3566 } else {
3567 const char* tname = type2name(java_lang_Class::primitive_type(obj));
3568 st->print("%s", tname ? tname : "type?");
3569 }
3570 } else if (this == SystemDictionary::MethodType_klass()) {
3571 st->print(" = ");
3572 java_lang_invoke_MethodType::print_signature(obj, st);
3573 } else if (java_lang_boxing_object::is_instance(obj)) {
3574 st->print(" = ");
3575 java_lang_boxing_object::print(obj, st);
3576 } else if (this == SystemDictionary::LambdaForm_klass()) {
3577 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
3578 if (vmentry != NULL) {
3579 st->print(" => ");
3580 vmentry->print_value_on(st);
3581 }
3582 } else if (this == SystemDictionary::MemberName_klass()) {
3583 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
3584 if (vmtarget != NULL) {
3585 st->print(" = ");
3586 vmtarget->print_value_on(st);
3587 } else {
3588 java_lang_invoke_MemberName::clazz(obj)->print_value_on(st);
3589 st->print(".");
3590 java_lang_invoke_MemberName::name(obj)->print_value_on(st);
3591 }
3592 }
3593 }
3594
3595 const char* InstanceKlass::internal_name() const {
3596 return external_name();
3597 }
3598
3599 void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data,
3600 const char* module_name,
3601 const ClassFileStream* cfs) const {
3602 if (!log_is_enabled(Info, class, load)) {
3603 return;
3604 }
3605
3606 ResourceMark rm;
3607 LogMessage(class, load) msg;
3608 stringStream info_stream;
3609
3610 // Name and class hierarchy info
3611 info_stream.print("%s", external_name());
3612
3613 // Source
3614 if (cfs != NULL) {
3615 if (cfs->source() != NULL) {
3616 if (module_name != NULL) {
3617 // When the boot loader created the stream, it didn't know the module name
3618 // yet. Let's format it now.
3619 if (cfs->from_boot_loader_modules_image()) {
3620 info_stream.print(" source: jrt:/%s", module_name);
3621 } else {
3622 info_stream.print(" source: %s", cfs->source());
3623 }
3624 } else {
3625 info_stream.print(" source: %s", cfs->source());
3626 }
3627 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) {
3628 Thread* THREAD = Thread::current();
3629 Klass* caller =
3630 THREAD->is_Java_thread()
3631 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
3632 : NULL;
3633 // caller can be NULL, for example, during a JVMTI VM_Init hook
3634 if (caller != NULL) {
3635 info_stream.print(" source: instance of %s", caller->external_name());
3636 } else {
3637 // source is unknown
3638 }
3639 } else {
3640 oop class_loader = loader_data->class_loader();
3641 info_stream.print(" source: %s", class_loader->klass()->external_name());
3642 }
3643 } else {
3644 assert(this->is_shared(), "must be");
3645 if (MetaspaceShared::is_shared_dynamic((void*)this)) {
3646 info_stream.print(" source: shared objects file (top)");
3647 } else {
3648 info_stream.print(" source: shared objects file");
3649 }
3650 }
3651
3652 msg.info("%s", info_stream.as_string());
3653
3654 if (log_is_enabled(Debug, class, load)) {
3655 stringStream debug_stream;
3656
3657 // Class hierarchy info
3658 debug_stream.print(" klass: " INTPTR_FORMAT " super: " INTPTR_FORMAT,
3659 p2i(this), p2i(superklass()));
3660
3661 // Interfaces
3662 if (local_interfaces() != NULL && local_interfaces()->length() > 0) {
3663 debug_stream.print(" interfaces:");
3664 int length = local_interfaces()->length();
3665 for (int i = 0; i < length; i++) {
3666 debug_stream.print(" " INTPTR_FORMAT,
3667 p2i(InstanceKlass::cast(local_interfaces()->at(i))));
3668 }
3669 }
3670
3671 // Class loader
3672 debug_stream.print(" loader: [");
3673 loader_data->print_value_on(&debug_stream);
3674 debug_stream.print("]");
3675
3676 // Classfile checksum
3677 if (cfs) {
3678 debug_stream.print(" bytes: %d checksum: %08x",
3679 cfs->length(),
3680 ClassLoader::crc32(0, (const char*)cfs->buffer(),
3681 cfs->length()));
3682 }
3683
3684 msg.debug("%s", debug_stream.as_string());
3685 }
3686 }
3687
3688 // Verification
3689
3690 class VerifyFieldClosure: public BasicOopIterateClosure {
3691 protected:
3692 template <class T> void do_oop_work(T* p) {
3693 oop obj = RawAccess<>::oop_load(p);
3694 if (!oopDesc::is_oop_or_null(obj)) {
3695 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj));
3696 Universe::print_on(tty);
3697 guarantee(false, "boom");
3698 }
3699 }
3700 public:
3701 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); }
3702 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
3703 };
3704
3705 void InstanceKlass::verify_on(outputStream* st) {
3706 #ifndef PRODUCT
3707 // Avoid redundant verifies, this really should be in product.
3708 if (_verify_count == Universe::verify_count()) return;
3709 _verify_count = Universe::verify_count();
3710 #endif
3711
3712 // Verify Klass
3713 Klass::verify_on(st);
3714
3715 // Verify that klass is present in ClassLoaderData
3716 guarantee(class_loader_data()->contains_klass(this),
3717 "this class isn't found in class loader data");
3718
3719 // Verify vtables
3720 if (is_linked()) {
3721 // $$$ This used to be done only for m/s collections. Doing it
3722 // always seemed a valid generalization. (DLD -- 6/00)
3723 vtable().verify(st);
3724 }
3725
3726 // Verify first subklass
3727 if (subklass() != NULL) {
3728 guarantee(subklass()->is_klass(), "should be klass");
3729 }
3730
3731 // Verify siblings
3732 Klass* super = this->super();
3733 Klass* sib = next_sibling();
3734 if (sib != NULL) {
3735 if (sib == this) {
3736 fatal("subclass points to itself " PTR_FORMAT, p2i(sib));
3737 }
3738
3739 guarantee(sib->is_klass(), "should be klass");
3740 guarantee(sib->super() == super, "siblings should have same superklass");
3741 }
3742
3743 // Verify local interfaces
3744 if (local_interfaces()) {
3745 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
3746 for (int j = 0; j < local_interfaces->length(); j++) {
3747 InstanceKlass* e = local_interfaces->at(j);
3748 guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
3749 }
3750 }
3751
3752 // Verify transitive interfaces
3753 if (transitive_interfaces() != NULL) {
3754 Array<InstanceKlass*>* transitive_interfaces = this->transitive_interfaces();
3755 for (int j = 0; j < transitive_interfaces->length(); j++) {
3756 InstanceKlass* e = transitive_interfaces->at(j);
3757 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
3758 }
3759 }
3760
3761 // Verify methods
3762 if (methods() != NULL) {
3763 Array<Method*>* methods = this->methods();
3764 for (int j = 0; j < methods->length(); j++) {
3765 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3766 }
3767 for (int j = 0; j < methods->length() - 1; j++) {
3768 Method* m1 = methods->at(j);
3769 Method* m2 = methods->at(j + 1);
3770 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3771 }
3772 }
3773
3774 // Verify method ordering
3775 if (method_ordering() != NULL) {
3776 Array<int>* method_ordering = this->method_ordering();
3777 int length = method_ordering->length();
3778 if (JvmtiExport::can_maintain_original_method_order() ||
3779 ((UseSharedSpaces || Arguments::is_dumping_archive()) && length != 0)) {
3780 guarantee(length == methods()->length(), "invalid method ordering length");
3781 jlong sum = 0;
3782 for (int j = 0; j < length; j++) {
3783 int original_index = method_ordering->at(j);
3784 guarantee(original_index >= 0, "invalid method ordering index");
3785 guarantee(original_index < length, "invalid method ordering index");
3786 sum += original_index;
3787 }
3788 // Verify sum of indices 0,1,...,length-1
3789 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
3790 } else {
3791 guarantee(length == 0, "invalid method ordering length");
3792 }
3793 }
3794
3795 // Verify default methods
3796 if (default_methods() != NULL) {
3797 Array<Method*>* methods = this->default_methods();
3798 for (int j = 0; j < methods->length(); j++) {
3799 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3800 }
3801 for (int j = 0; j < methods->length() - 1; j++) {
3802 Method* m1 = methods->at(j);
3803 Method* m2 = methods->at(j + 1);
3804 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3805 }
3806 }
3807
3808 // Verify JNI static field identifiers
3809 if (jni_ids() != NULL) {
3810 jni_ids()->verify(this);
3811 }
3812
3813 // Verify other fields
3814 if (constants() != NULL) {
3815 guarantee(constants()->is_constantPool(), "should be constant pool");
3816 }
3817 const Klass* anonymous_host = unsafe_anonymous_host();
3818 if (anonymous_host != NULL) {
3819 guarantee(anonymous_host->is_klass(), "should be klass");
3820 }
3821 }
3822
3823 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
3824 Klass::oop_verify_on(obj, st);
3825 VerifyFieldClosure blk;
3826 obj->oop_iterate(&blk);
3827 }
3828
3829
3830 // JNIid class for jfieldIDs only
3831 // Note to reviewers:
3832 // These JNI functions are just moved over to column 1 and not changed
3833 // in the compressed oops workspace.
3834 JNIid::JNIid(Klass* holder, int offset, JNIid* next) {
3835 _holder = holder;
3836 _offset = offset;
3837 _next = next;
3838 debug_only(_is_static_field_id = false;)
3839 }
3840
3841
3842 JNIid* JNIid::find(int offset) {
3843 JNIid* current = this;
3844 while (current != NULL) {
3845 if (current->offset() == offset) return current;
3846 current = current->next();
3847 }
3848 return NULL;
3849 }
3850
3851 void JNIid::deallocate(JNIid* current) {
3852 while (current != NULL) {
3853 JNIid* next = current->next();
3854 delete current;
3855 current = next;
3856 }
3857 }
3858
3859
3860 void JNIid::verify(Klass* holder) {
3861 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields();
3862 int end_field_offset;
3863 end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize);
3864
3865 JNIid* current = this;
3866 while (current != NULL) {
3867 guarantee(current->holder() == holder, "Invalid klass in JNIid");
3868 #ifdef ASSERT
3869 int o = current->offset();
3870 if (current->is_static_field_id()) {
3871 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid");
3872 }
3873 #endif
3874 current = current->next();
3875 }
3876 }
3877
3878 void InstanceKlass::set_init_state(ClassState state) {
3879 #ifdef ASSERT
3880 bool good_state = is_shared() ? (_init_state <= state)
3881 : (_init_state < state);
3882 assert(good_state || state == allocated, "illegal state transition");
3883 #endif
3884 assert(_init_thread == NULL, "should be cleared before state change");
3885 _init_state = (u1)state;
3886 }
3887
3888 #if INCLUDE_JVMTI
3889
3890 // RedefineClasses() support for previous versions
3891
3892 // Globally, there is at least one previous version of a class to walk
3893 // during class unloading, which is saved because old methods in the class
3894 // are still running. Otherwise the previous version list is cleaned up.
3895 bool InstanceKlass::_has_previous_versions = false;
3896
3897 // Returns true if there are previous versions of a class for class
3898 // unloading only. Also resets the flag to false. purge_previous_version
3899 // will set the flag to true if there are any left, i.e., if there's any
3900 // work to do for next time. This is to avoid the expensive code cache
3901 // walk in CLDG::clean_deallocate_lists().
3902 bool InstanceKlass::has_previous_versions_and_reset() {
3903 bool ret = _has_previous_versions;
3904 log_trace(redefine, class, iklass, purge)("Class unloading: has_previous_versions = %s",
3905 ret ? "true" : "false");
3906 _has_previous_versions = false;
3907 return ret;
3908 }
3909
3910 // Purge previous versions before adding new previous versions of the class and
3911 // during class unloading.
3912 void InstanceKlass::purge_previous_version_list() {
3913 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
3914 assert(has_been_redefined(), "Should only be called for main class");
3915
3916 // Quick exit.
3917 if (previous_versions() == NULL) {
3918 return;
3919 }
3920
3921 // This klass has previous versions so see what we can cleanup
3922 // while it is safe to do so.
3923
3924 int deleted_count = 0; // leave debugging breadcrumbs
3925 int live_count = 0;
3926 ClassLoaderData* loader_data = class_loader_data();
3927 assert(loader_data != NULL, "should never be null");
3928
3929 ResourceMark rm;
3930 log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name());
3931
3932 // previous versions are linked together through the InstanceKlass
3933 InstanceKlass* pv_node = previous_versions();
3934 InstanceKlass* last = this;
3935 int version = 0;
3936
3937 // check the previous versions list
3938 for (; pv_node != NULL; ) {
3939
3940 ConstantPool* pvcp = pv_node->constants();
3941 assert(pvcp != NULL, "cp ref was unexpectedly cleared");
3942
3943 if (!pvcp->on_stack()) {
3944 // If the constant pool isn't on stack, none of the methods
3945 // are executing. Unlink this previous_version.
3946 // The previous version InstanceKlass is on the ClassLoaderData deallocate list
3947 // so will be deallocated during the next phase of class unloading.
3948 log_trace(redefine, class, iklass, purge)
3949 ("previous version " INTPTR_FORMAT " is dead.", p2i(pv_node));
3950 // For debugging purposes.
3951 pv_node->set_is_scratch_class();
3952 // Unlink from previous version list.
3953 assert(pv_node->class_loader_data() == loader_data, "wrong loader_data");
3954 InstanceKlass* next = pv_node->previous_versions();
3955 pv_node->link_previous_versions(NULL); // point next to NULL
3956 last->link_previous_versions(next);
3957 // Add to the deallocate list after unlinking
3958 loader_data->add_to_deallocate_list(pv_node);
3959 pv_node = next;
3960 deleted_count++;
3961 version++;
3962 continue;
3963 } else {
3964 log_trace(redefine, class, iklass, purge)("previous version " INTPTR_FORMAT " is alive", p2i(pv_node));
3965 assert(pvcp->pool_holder() != NULL, "Constant pool with no holder");
3966 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
3967 live_count++;
3968 // found a previous version for next time we do class unloading
3969 _has_previous_versions = true;
3970 }
3971
3972 // At least one method is live in this previous version.
3973 // Reset dead EMCP methods not to get breakpoints.
3974 // All methods are deallocated when all of the methods for this class are no
3975 // longer running.
3976 Array<Method*>* method_refs = pv_node->methods();
3977 if (method_refs != NULL) {
3978 log_trace(redefine, class, iklass, purge)("previous methods length=%d", method_refs->length());
3979 for (int j = 0; j < method_refs->length(); j++) {
3980 Method* method = method_refs->at(j);
3981
3982 if (!method->on_stack()) {
3983 // no breakpoints for non-running methods
3984 if (method->is_running_emcp()) {
3985 method->set_running_emcp(false);
3986 }
3987 } else {
3988 assert (method->is_obsolete() || method->is_running_emcp(),
3989 "emcp method cannot run after emcp bit is cleared");
3990 log_trace(redefine, class, iklass, purge)
3991 ("purge: %s(%s): prev method @%d in version @%d is alive",
3992 method->name()->as_C_string(), method->signature()->as_C_string(), j, version);
3993 }
3994 }
3995 }
3996 // next previous version
3997 last = pv_node;
3998 pv_node = pv_node->previous_versions();
3999 version++;
4000 }
4001 log_trace(redefine, class, iklass, purge)
4002 ("previous version stats: live=%d, deleted=%d", live_count, deleted_count);
4003 }
4004
4005 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods,
4006 int emcp_method_count) {
4007 int obsolete_method_count = old_methods->length() - emcp_method_count;
4008
4009 if (emcp_method_count != 0 && obsolete_method_count != 0 &&
4010 _previous_versions != NULL) {
4011 // We have a mix of obsolete and EMCP methods so we have to
4012 // clear out any matching EMCP method entries the hard way.
4013 int local_count = 0;
4014 for (int i = 0; i < old_methods->length(); i++) {
4015 Method* old_method = old_methods->at(i);
4016 if (old_method->is_obsolete()) {
4017 // only obsolete methods are interesting
4018 Symbol* m_name = old_method->name();
4019 Symbol* m_signature = old_method->signature();
4020
4021 // previous versions are linked together through the InstanceKlass
4022 int j = 0;
4023 for (InstanceKlass* prev_version = _previous_versions;
4024 prev_version != NULL;
4025 prev_version = prev_version->previous_versions(), j++) {
4026
4027 Array<Method*>* method_refs = prev_version->methods();
4028 for (int k = 0; k < method_refs->length(); k++) {
4029 Method* method = method_refs->at(k);
4030
4031 if (!method->is_obsolete() &&
4032 method->name() == m_name &&
4033 method->signature() == m_signature) {
4034 // The current RedefineClasses() call has made all EMCP
4035 // versions of this method obsolete so mark it as obsolete
4036 log_trace(redefine, class, iklass, add)
4037 ("%s(%s): flush obsolete method @%d in version @%d",
4038 m_name->as_C_string(), m_signature->as_C_string(), k, j);
4039
4040 method->set_is_obsolete();
4041 break;
4042 }
4043 }
4044
4045 // The previous loop may not find a matching EMCP method, but
4046 // that doesn't mean that we can optimize and not go any
4047 // further back in the PreviousVersion generations. The EMCP
4048 // method for this generation could have already been made obsolete,
4049 // but there still may be an older EMCP method that has not
4050 // been made obsolete.
4051 }
4052
4053 if (++local_count >= obsolete_method_count) {
4054 // no more obsolete methods so bail out now
4055 break;
4056 }
4057 }
4058 }
4059 }
4060 }
4061
4062 // Save the scratch_class as the previous version if any of the methods are running.
4063 // The previous_versions are used to set breakpoints in EMCP methods and they are
4064 // also used to clean MethodData links to redefined methods that are no longer running.
4065 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class,
4066 int emcp_method_count) {
4067 assert(Thread::current()->is_VM_thread(),
4068 "only VMThread can add previous versions");
4069
4070 ResourceMark rm;
4071 log_trace(redefine, class, iklass, add)
4072 ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count);
4073
4074 // Clean out old previous versions for this class
4075 purge_previous_version_list();
4076
4077 // Mark newly obsolete methods in remaining previous versions. An EMCP method from
4078 // a previous redefinition may be made obsolete by this redefinition.
4079 Array<Method*>* old_methods = scratch_class->methods();
4080 mark_newly_obsolete_methods(old_methods, emcp_method_count);
4081
4082 // If the constant pool for this previous version of the class
4083 // is not marked as being on the stack, then none of the methods
4084 // in this previous version of the class are on the stack so
4085 // we don't need to add this as a previous version.
4086 ConstantPool* cp_ref = scratch_class->constants();
4087 if (!cp_ref->on_stack()) {
4088 log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running");
4089 // For debugging purposes.
4090 scratch_class->set_is_scratch_class();
4091 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class);
4092 return;
4093 }
4094
4095 if (emcp_method_count != 0) {
4096 // At least one method is still running, check for EMCP methods
4097 for (int i = 0; i < old_methods->length(); i++) {
4098 Method* old_method = old_methods->at(i);
4099 if (!old_method->is_obsolete() && old_method->on_stack()) {
4100 // if EMCP method (not obsolete) is on the stack, mark as EMCP so that
4101 // we can add breakpoints for it.
4102
4103 // We set the method->on_stack bit during safepoints for class redefinition
4104 // and use this bit to set the is_running_emcp bit.
4105 // After the safepoint, the on_stack bit is cleared and the running emcp
4106 // method may exit. If so, we would set a breakpoint in a method that
4107 // is never reached, but this won't be noticeable to the programmer.
4108 old_method->set_running_emcp(true);
4109 log_trace(redefine, class, iklass, add)
4110 ("EMCP method %s is on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
4111 } else if (!old_method->is_obsolete()) {
4112 log_trace(redefine, class, iklass, add)
4113 ("EMCP method %s is NOT on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
4114 }
4115 }
4116 }
4117
4118 // Add previous version if any methods are still running.
4119 // Set has_previous_version flag for processing during class unloading.
4120 _has_previous_versions = true;
4121 log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack.");
4122 assert(scratch_class->previous_versions() == NULL, "shouldn't have a previous version");
4123 scratch_class->link_previous_versions(previous_versions());
4124 link_previous_versions(scratch_class);
4125 } // end add_previous_version()
4126
4127 #endif // INCLUDE_JVMTI
4128
4129 Method* InstanceKlass::method_with_idnum(int idnum) {
4130 Method* m = NULL;
4131 if (idnum < methods()->length()) {
4132 m = methods()->at(idnum);
4133 }
4134 if (m == NULL || m->method_idnum() != idnum) {
4135 for (int index = 0; index < methods()->length(); ++index) {
4136 m = methods()->at(index);
4137 if (m->method_idnum() == idnum) {
4138 return m;
4139 }
4140 }
4141 // None found, return null for the caller to handle.
4142 return NULL;
4143 }
4144 return m;
4145 }
4146
4147
4148 Method* InstanceKlass::method_with_orig_idnum(int idnum) {
4149 if (idnum >= methods()->length()) {
4150 return NULL;
4151 }
4152 Method* m = methods()->at(idnum);
4153 if (m != NULL && m->orig_method_idnum() == idnum) {
4154 return m;
4155 }
4156 // Obsolete method idnum does not match the original idnum
4157 for (int index = 0; index < methods()->length(); ++index) {
4158 m = methods()->at(index);
4159 if (m->orig_method_idnum() == idnum) {
4160 return m;
4161 }
4162 }
4163 // None found, return null for the caller to handle.
4164 return NULL;
4165 }
4166
4167
4168 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) {
4169 InstanceKlass* holder = get_klass_version(version);
4170 if (holder == NULL) {
4171 return NULL; // The version of klass is gone, no method is found
4172 }
4173 Method* method = holder->method_with_orig_idnum(idnum);
4174 return method;
4175 }
4176
4177 #if INCLUDE_JVMTI
4178 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() {
4179 return _cached_class_file;
4180 }
4181
4182 jint InstanceKlass::get_cached_class_file_len() {
4183 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
4184 }
4185
4186 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
4187 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
4188 }
4189 #endif