1 /*
2 * Copyright (c) 1997, 2019, 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/symbolTable.hpp"
35 #include "classfile/systemDictionary.hpp"
36 #include "classfile/systemDictionaryShared.hpp"
37 #include "classfile/verifier.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "code/dependencyContext.hpp"
40 #include "compiler/compileBroker.hpp"
41 #include "gc/shared/collectedHeap.inline.hpp"
42 #include "interpreter/oopMapCache.hpp"
43 #include "interpreter/rewriter.hpp"
44 #include "jvmtifiles/jvmti.h"
45 #include "logging/log.hpp"
46 #include "logging/logMessage.hpp"
47 #include "logging/logStream.hpp"
48 #include "memory/allocation.inline.hpp"
49 #include "memory/heapInspection.hpp"
50 #include "memory/iterator.inline.hpp"
51 #include "memory/metadataFactory.hpp"
52 #include "memory/metaspaceClosure.hpp"
53 #include "memory/metaspaceShared.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/resourceArea.hpp"
56 #include "memory/universe.hpp"
57 #include "oops/fieldStreams.inline.hpp"
58 #include "oops/constantPool.hpp"
59 #include "oops/instanceClassLoaderKlass.hpp"
60 #include "oops/instanceKlass.inline.hpp"
61 #include "oops/instanceMirrorKlass.hpp"
62 #include "oops/instanceOop.hpp"
63 #include "oops/klass.inline.hpp"
64 #include "oops/method.hpp"
65 #include "oops/oop.inline.hpp"
66 #include "oops/symbol.hpp"
67 #include "prims/jvmtiExport.hpp"
68 #include "prims/jvmtiRedefineClasses.hpp"
69 #include "prims/jvmtiThreadState.hpp"
70 #include "prims/methodComparator.hpp"
71 #include "runtime/atomic.hpp"
72 #include "runtime/biasedLocking.hpp"
73 #include "runtime/fieldDescriptor.inline.hpp"
74 #include "runtime/handles.inline.hpp"
75 #include "runtime/javaCalls.hpp"
76 #include "runtime/mutexLocker.hpp"
77 #include "runtime/orderAccess.hpp"
78 #include "runtime/thread.inline.hpp"
79 #include "services/classLoadingService.hpp"
80 #include "services/threadService.hpp"
81 #include "utilities/dtrace.hpp"
82 #include "utilities/events.hpp"
83 #include "utilities/macros.hpp"
84 #include "utilities/stringUtils.hpp"
85 #ifdef COMPILER1
86 #include "c1/c1_Compiler.hpp"
87 #endif
88 #if INCLUDE_JFR
89 #include "jfr/jfrEvents.hpp"
90 #endif
91
92
93 #ifdef DTRACE_ENABLED
94
95
96 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED
97 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE
98 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT
99 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS
100 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED
101 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT
102 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR
103 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END
104 #define DTRACE_CLASSINIT_PROBE(type, thread_type) \
105 { \
106 char* data = NULL; \
107 int len = 0; \
108 Symbol* clss_name = name(); \
109 if (clss_name != NULL) { \
110 data = (char*)clss_name->bytes(); \
111 len = clss_name->utf8_length(); \
112 } \
113 HOTSPOT_CLASS_INITIALIZATION_##type( \
114 data, len, (void*)class_loader(), thread_type); \
115 }
116
117 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) \
118 { \
119 char* data = NULL; \
120 int len = 0; \
121 Symbol* clss_name = name(); \
122 if (clss_name != NULL) { \
123 data = (char*)clss_name->bytes(); \
124 len = clss_name->utf8_length(); \
125 } \
126 HOTSPOT_CLASS_INITIALIZATION_##type( \
127 data, len, (void*)class_loader(), thread_type, wait); \
128 }
129
130 #else // ndef DTRACE_ENABLED
131
132 #define DTRACE_CLASSINIT_PROBE(type, thread_type)
133 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait)
134
135 #endif // ndef DTRACE_ENABLED
136
137 static inline bool is_class_loader(const Symbol* class_name,
138 const ClassFileParser& parser) {
139 assert(class_name != NULL, "invariant");
140
141 if (class_name == vmSymbols::java_lang_ClassLoader()) {
142 return true;
143 }
144
145 if (SystemDictionary::ClassLoader_klass_loaded()) {
146 const Klass* const super_klass = parser.super_klass();
147 if (super_klass != NULL) {
148 if (super_klass->is_subtype_of(SystemDictionary::ClassLoader_klass())) {
149 return true;
150 }
151 }
152 }
153 return false;
154 }
155
156 // called to verify that k is a member of this nest
157 bool InstanceKlass::has_nest_member(InstanceKlass* k, TRAPS) const {
158 assert(!is_hidden(), "unexpected hidden class");
159 if (_nest_members == NULL || _nest_members == Universe::the_empty_short_array()) {
160 if (log_is_enabled(Trace, class, nestmates)) {
161 ResourceMark rm(THREAD);
162 log_trace(class, nestmates)("Checked nest membership of %s in non-nest-host class %s",
163 k->external_name(), this->external_name());
164 }
165 return false;
166 }
167
168 if (log_is_enabled(Trace, class, nestmates)) {
169 ResourceMark rm(THREAD);
170 log_trace(class, nestmates)("Checking nest membership of %s in %s",
171 k->external_name(), this->external_name());
172 }
173
174 // Check for a resolved cp entry , else fall back to a name check.
175 // We don't want to resolve any class other than the one being checked.
176 for (int i = 0; i < _nest_members->length(); i++) {
177 int cp_index = _nest_members->at(i);
178 if (_constants->tag_at(cp_index).is_klass()) {
179 Klass* k2 = _constants->klass_at(cp_index, CHECK_false);
180 if (k2 == k) {
181 log_trace(class, nestmates)("- class is listed at nest_members[%d] => cp[%d]", i, cp_index);
182 return true;
183 }
184 }
185 else {
186 Symbol* name = _constants->klass_name_at(cp_index);
187 if (name == k->name()) {
188 log_trace(class, nestmates)("- Found it at nest_members[%d] => cp[%d]", i, cp_index);
189
190 // Names match so check actual klass - this may trigger class loading if
191 // it doesn't match (though that should be impossible). But to be safe we
192 // have to check for a compiler thread executing here.
193 if (!THREAD->can_call_java() && !_constants->tag_at(cp_index).is_klass()) {
194 log_trace(class, nestmates)("- validation required resolution in an unsuitable thread");
195 return false;
196 }
197
198 Klass* k2 = _constants->klass_at(cp_index, CHECK_false);
199 if (k2 == k) {
200 log_trace(class, nestmates)("- class is listed as a nest member");
201 return true;
202 }
203 else {
204 // same name but different klass!
205 log_trace(class, nestmates)(" - klass comparison failed!");
206 // can't have two names the same, so we're done
207 return false;
208 }
209 }
210 }
211 }
212 log_trace(class, nestmates)("- class is NOT a nest member!");
213 return false;
214 }
215
216 InstanceKlass* InstanceKlass::runtime_nest_host(TRAPS) {
217 // TODO: nest_host returns NULL if validation fails. Need to follow up
218 // the specification when to evaluate the runtime nest host. Right now
219 // it's only determined when a dynamic nestmate is added.
220 InstanceKlass* nest_host_k = nest_host(NULL, CHECK_NULL);
221 if (nest_host_k == NULL) {
222 assert(_nest_host == NULL, "should fail to validate NestNost");
223 // drop the static nest information; set dynamic nest to this class
224 if (log_is_enabled(Trace, class, nestmates)) {
225 ResourceMark rm(THREAD);
226 log_trace(class, nestmates)("Fail to validate static nest host of %s: setting nest-host to self",
227 this->external_name());
228 }
229 _nest_host = nest_host_k = this;
230 }
231 return nest_host_k;
232 }
233
234 // Return nest-host class, resolving, validating and saving it if needed.
235 // In cases where this is called from a thread that can not do classloading
236 // (such as a native JIT thread) then we simply return NULL, which in turn
237 // causes the access check to return false. Such code will retry the access
238 // from a more suitable environment later.
239 InstanceKlass* InstanceKlass::nest_host(Symbol* validationException, TRAPS) {
240 InstanceKlass* nest_host_k = _nest_host;
241 if (nest_host_k == NULL) {
242 // need to resolve and save our nest-host class. This could be attempted
243 // concurrently but as the result is idempotent and we don't use the class
244 // then we do not need any synchronization beyond what is implicitly used
245 // during class loading.
246 if (_nest_host_index != 0) { // we have a real nest_host
247 // Before trying to resolve check if we're in a suitable context
248 if (!THREAD->can_call_java() && !_constants->tag_at(_nest_host_index).is_klass()) {
249 if (log_is_enabled(Trace, class, nestmates)) {
250 ResourceMark rm(THREAD);
251 log_trace(class, nestmates)("Rejected resolution of nest-host of %s in unsuitable thread",
252 this->external_name());
253 }
254 return NULL;
255 }
256
257 if (log_is_enabled(Trace, class, nestmates)) {
258 ResourceMark rm(THREAD);
259 log_trace(class, nestmates)("Resolving nest-host of %s using cp entry for %s",
260 this->external_name(),
261 _constants->klass_name_at(_nest_host_index)->as_C_string());
262 }
263
264 Klass* k = _constants->klass_at(_nest_host_index, THREAD);
265 if (HAS_PENDING_EXCEPTION) {
266 Handle exc_h = Handle(THREAD, PENDING_EXCEPTION);
267 if (validationException == NULL && exc_h->is_a(SystemDictionary::LinkageError_klass())) {
268 // clear exception if fails to resolve the nest host class
269 CLEAR_PENDING_EXCEPTION;
270 }
271 // throw a new NCDFE with the original as its cause, and a clear msg
272 if (exc_h->is_a(SystemDictionary::NoClassDefFoundError_klass()) && validationException != NULL) {
273 // throw a new NCDFE with the original as its cause, and a clear msg
274 ResourceMark rm(THREAD);
275 char buf[200];
276 CLEAR_PENDING_EXCEPTION;
277 jio_snprintf(buf, sizeof(buf),
278 "Unable to load nest-host class (%s) of %s",
279 _constants->klass_name_at(_nest_host_index)->as_C_string(),
280 this->external_name());
281 log_trace(class, nestmates)("%s - NoClassDefFoundError", buf);
282 THROW_MSG_CAUSE_NULL(vmSymbols::java_lang_NoClassDefFoundError(), buf, exc_h);
283 }
284 // All other exceptions pass through (OOME, StackOverflowError, LinkageErrors etc).
285 return NULL;
286 }
287
288 // A valid nest-host is an instance class in the current package that lists this
289 // class as a nest member. If any of these conditions are not met we post the
290 // requested exception type (if any) and return NULL
291
292 const char* error = NULL;
293
294 // JVMS 5.4.4 indicates package check comes first
295 if (is_same_class_package(k)) {
296
297 // Now check actual membership. We can't be a member if our "host" is
298 // not an instance class.
299 if (k->is_instance_klass()) {
300 nest_host_k = InstanceKlass::cast(k);
301
302 bool is_member = nest_host_k->has_nest_member(this, CHECK_NULL);
303 if (is_member) {
304 // save resolved nest-host value
305 _nest_host = nest_host_k;
306
307 if (log_is_enabled(Trace, class, nestmates)) {
308 ResourceMark rm(THREAD);
309 log_trace(class, nestmates)("Resolved nest-host of %s to %s",
310 this->external_name(), k->external_name());
311 }
312 return nest_host_k;
313 }
314 }
315 error = "current type is not listed as a nest member";
316 } else {
317 error = "types are in different packages";
318 }
319
320 if (log_is_enabled(Trace, class, nestmates)) {
321 ResourceMark rm(THREAD);
322 log_trace(class, nestmates)
323 ("Type %s (loader: %s) is not a nest member of "
324 "resolved type %s (loader: %s): %s",
325 this->external_name(),
326 this->class_loader_data()->loader_name_and_id(),
327 k->external_name(),
328 k->class_loader_data()->loader_name_and_id(),
329 error);
330 }
331
332 if (validationException != NULL && THREAD->can_call_java()) {
333 ResourceMark rm(THREAD);
334 Exceptions::fthrow(THREAD_AND_LOCATION,
335 validationException,
336 "Type %s (loader: %s) is not a nest member of %s (loader: %s): %s",
337 this->external_name(),
338 this->class_loader_data()->loader_name_and_id(),
339 k->external_name(),
340 k->class_loader_data()->loader_name_and_id(),
341 error
342 );
343 }
344 return NULL;
345 } else {
346 if (log_is_enabled(Trace, class, nestmates)) {
347 ResourceMark rm(THREAD);
348 log_trace(class, nestmates)("Type %s is not part of a nest: setting nest-host to self",
349 this->external_name());
350 }
351 // save resolved nest-host value
352 return (_nest_host = this);
353 }
354 }
355 return nest_host_k;
356 }
357
358
359 // Dynamic nest member support: set this class's nest host to the given class.
360 // This occurs as part of the class definition, as soon as the instanceKlass
361 // has been created and doesn't require further resolution. The code:
362 // lookup().defineHiddenClass(bytes_for_X, NESTMATE);
363 // results in:
364 // class_of_X.set_nest_host(lookup().lookupClass().getNestHost())
365 // If it has an explicit _nest_host_index or _nest_members, these will be ignored.
366 // We also know the "host" is a valid nest-host in the same package so we can
367 // assert some of those facts.
368 void InstanceKlass::set_nest_host(InstanceKlass* host, TRAPS) {
369 assert(is_hidden(), "must be a hidden class");
370 assert(host != NULL, "NULL nest host specified");
371 assert(_nest_host == NULL, "current class has resolved nest-host");
372 assert((host->_nest_host == NULL && host->_nest_host_index == 0) ||
373 (host->_nest_host == host), "proposed host is not a valid nest-host");
374 // Can't assert this as package is not set yet:
375 // assert(is_same_class_package(host), "proposed host is in wrong package");
376
377 if (log_is_enabled(Trace, class, nestmates)) {
378 ResourceMark rm(THREAD);
379 // a hidden class does not expect a statically defined nest-host
380 if (_nest_host_index > 0) {
381 log_trace(class, nestmates)("Type %s is a dynamic nest member of %s: the NestHost attribute in the current class is ignored",
382 this->external_name(),
383 host->external_name());
384 } else if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
385 log_trace(class, nestmates)("Type %s is a dynamic nest member of %s: the NestMembers attribute in the current class is ignored",
386 this->external_name(),
387 host->external_name());
388 }
389 }
390 // set dynamic nest host
391 _nest_host = host;
392 }
393
394 // check if 'this' and k are nestmates (same nest_host), or k is our nest_host,
395 // or we are k's nest_host - all of which is covered by comparing the two
396 // resolved_nest_hosts
397 bool InstanceKlass::has_nestmate_access_to(InstanceKlass* k, TRAPS) {
398
399 assert(this != k, "this should be handled by higher-level code");
400
401 // Per JVMS 5.4.4 we first resolve and validate the current class, then
402 // the target class k. Resolution exceptions will be passed on by upper
403 // layers. IncompatibleClassChangeErrors from membership validation failures
404 // will also be passed through.
405
406 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
407 InstanceKlass* cur_host = nest_host(icce, CHECK_false);
408 if (cur_host == NULL) {
409 return false;
410 }
411
412 Klass* k_nest_host = k->nest_host(icce, CHECK_false);
413 if (k_nest_host == NULL) {
414 return false;
415 }
416
417 bool access = (cur_host == k_nest_host);
418
419 if (log_is_enabled(Trace, class, nestmates)) {
420 ResourceMark rm(THREAD);
421 log_trace(class, nestmates)("Class %s does %shave nestmate access to %s",
422 this->external_name(),
423 access ? "" : "NOT ",
424 k->external_name());
425 }
426
427 return access;
428 }
429
430 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) {
431 bool is_hidden_or_anonymous = parser.is_hidden() || parser.is_unsafe_anonymous();
432 const int size = InstanceKlass::size(parser.vtable_size(),
433 parser.itable_size(),
434 nonstatic_oop_map_size(parser.total_oop_map_count()),
435 parser.is_interface(),
436 is_hidden_or_anonymous,
437 should_store_fingerprint(is_hidden_or_anonymous));
438
439 const Symbol* const class_name = parser.class_name();
440 assert(class_name != NULL, "invariant");
441 ClassLoaderData* loader_data = parser.loader_data();
442 assert(loader_data != NULL, "invariant");
443
444 InstanceKlass* ik;
445
446 // Allocation
447 if (REF_NONE == parser.reference_type()) {
448 if (class_name == vmSymbols::java_lang_Class()) {
449 // mirror
450 ik = new (loader_data, size, THREAD) InstanceMirrorKlass(parser);
451 }
452 else if (is_class_loader(class_name, parser)) {
453 // class loader
454 ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser);
455 } else {
456 // normal
457 ik = new (loader_data, size, THREAD) InstanceKlass(parser, InstanceKlass::_misc_kind_other);
458 }
459 } else {
460 // reference
461 ik = new (loader_data, size, THREAD) InstanceRefKlass(parser);
462 }
463
464 // Check for pending exception before adding to the loader data and incrementing
465 // class count. Can get OOM here.
466 if (HAS_PENDING_EXCEPTION) {
467 return NULL;
468 }
469
470 return ik;
471 }
472
473
474 // copy method ordering from resource area to Metaspace
475 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) {
476 if (m != NULL) {
477 // allocate a new array and copy contents (memcpy?)
478 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
479 for (int i = 0; i < m->length(); i++) {
480 _method_ordering->at_put(i, m->at(i));
481 }
482 } else {
483 _method_ordering = Universe::the_empty_int_array();
484 }
485 }
486
487 // create a new array of vtable_indices for default methods
488 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
489 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
490 assert(default_vtable_indices() == NULL, "only create once");
491 set_default_vtable_indices(vtable_indices);
492 return vtable_indices;
493 }
494
495 InstanceKlass::InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id) :
496 Klass(id),
497 _nest_members(NULL),
498 _nest_host_index(0),
499 _nest_host(NULL),
500 _static_field_size(parser.static_field_size()),
501 _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())),
502 _itable_len(parser.itable_size()),
503 _init_thread(NULL),
504 _init_state(allocated),
505 _reference_type(parser.reference_type())
506 {
507 set_vtable_length(parser.vtable_size());
508 set_kind(kind);
509 set_access_flags(parser.access_flags());
510 if (parser.is_hidden()) set_is_hidden();
511 set_is_unsafe_anonymous(parser.is_unsafe_anonymous());
512 set_layout_helper(Klass::instance_layout_helper(parser.layout_size(),
513 false));
514
515 assert(NULL == _methods, "underlying memory not zeroed?");
516 assert(is_instance_klass(), "is layout incorrect?");
517 assert(size_helper() == parser.layout_size(), "incorrect size_helper?");
518
519 if (Arguments::is_dumping_archive()) {
520 SystemDictionaryShared::init_dumptime_info(this);
521 }
522
523 // Set biased locking bit for all instances of this class; it will be
524 // cleared if revocation occurs too often for this type
525 if (UseBiasedLocking && BiasedLocking::enabled()) {
526 set_prototype_header(markWord::biased_locking_prototype());
527 }
528 }
529
530 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
531 Array<Method*>* methods) {
532 if (methods != NULL && methods != Universe::the_empty_method_array() &&
533 !methods->is_shared()) {
534 for (int i = 0; i < methods->length(); i++) {
535 Method* method = methods->at(i);
536 if (method == NULL) continue; // maybe null if error processing
537 // Only want to delete methods that are not executing for RedefineClasses.
538 // The previous version will point to them so they're not totally dangling
539 assert (!method->on_stack(), "shouldn't be called with methods on stack");
540 MetadataFactory::free_metadata(loader_data, method);
541 }
542 MetadataFactory::free_array<Method*>(loader_data, methods);
543 }
544 }
545
546 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
547 const Klass* super_klass,
548 Array<InstanceKlass*>* local_interfaces,
549 Array<InstanceKlass*>* transitive_interfaces) {
550 // Only deallocate transitive interfaces if not empty, same as super class
551 // or same as local interfaces. See code in parseClassFile.
552 Array<InstanceKlass*>* ti = transitive_interfaces;
553 if (ti != Universe::the_empty_instance_klass_array() && ti != local_interfaces) {
554 // check that the interfaces don't come from super class
555 Array<InstanceKlass*>* sti = (super_klass == NULL) ? NULL :
556 InstanceKlass::cast(super_klass)->transitive_interfaces();
557 if (ti != sti && ti != NULL && !ti->is_shared()) {
558 MetadataFactory::free_array<InstanceKlass*>(loader_data, ti);
559 }
560 }
561
562 // local interfaces can be empty
563 if (local_interfaces != Universe::the_empty_instance_klass_array() &&
564 local_interfaces != NULL && !local_interfaces->is_shared()) {
565 MetadataFactory::free_array<InstanceKlass*>(loader_data, local_interfaces);
566 }
567 }
568
569 // This function deallocates the metadata and C heap pointers that the
570 // InstanceKlass points to.
571 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
572
573 // Orphan the mirror first, CMS thinks it's still live.
574 if (java_mirror() != NULL) {
575 java_lang_Class::set_klass(java_mirror(), NULL);
576 }
577
578 // Also remove mirror from handles
579 loader_data->remove_handle(_java_mirror);
580
581 // Need to take this class off the class loader data list.
582 loader_data->remove_class(this);
583
584 // The array_klass for this class is created later, after error handling.
585 // For class redefinition, we keep the original class so this scratch class
586 // doesn't have an array class. Either way, assert that there is nothing
587 // to deallocate.
588 assert(array_klasses() == NULL, "array classes shouldn't be created for this class yet");
589
590 // Release C heap allocated data that this might point to, which includes
591 // reference counting symbol names.
592 release_C_heap_structures();
593
594 deallocate_methods(loader_data, methods());
595 set_methods(NULL);
596
597 if (method_ordering() != NULL &&
598 method_ordering() != Universe::the_empty_int_array() &&
599 !method_ordering()->is_shared()) {
600 MetadataFactory::free_array<int>(loader_data, method_ordering());
601 }
602 set_method_ordering(NULL);
603
604 // default methods can be empty
605 if (default_methods() != NULL &&
606 default_methods() != Universe::the_empty_method_array() &&
607 !default_methods()->is_shared()) {
608 MetadataFactory::free_array<Method*>(loader_data, default_methods());
609 }
610 // Do NOT deallocate the default methods, they are owned by superinterfaces.
611 set_default_methods(NULL);
612
613 // default methods vtable indices can be empty
614 if (default_vtable_indices() != NULL &&
615 !default_vtable_indices()->is_shared()) {
616 MetadataFactory::free_array<int>(loader_data, default_vtable_indices());
617 }
618 set_default_vtable_indices(NULL);
619
620
621 // This array is in Klass, but remove it with the InstanceKlass since
622 // this place would be the only caller and it can share memory with transitive
623 // interfaces.
624 if (secondary_supers() != NULL &&
625 secondary_supers() != Universe::the_empty_klass_array() &&
626 // see comments in compute_secondary_supers about the following cast
627 (address)(secondary_supers()) != (address)(transitive_interfaces()) &&
628 !secondary_supers()->is_shared()) {
629 MetadataFactory::free_array<Klass*>(loader_data, secondary_supers());
630 }
631 set_secondary_supers(NULL);
632
633 deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces());
634 set_transitive_interfaces(NULL);
635 set_local_interfaces(NULL);
636
637 if (fields() != NULL && !fields()->is_shared()) {
638 MetadataFactory::free_array<jushort>(loader_data, fields());
639 }
640 set_fields(NULL, 0);
641
642 // If a method from a redefined class is using this constant pool, don't
643 // delete it, yet. The new class's previous version will point to this.
644 if (constants() != NULL) {
645 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack");
646 if (!constants()->is_shared()) {
647 MetadataFactory::free_metadata(loader_data, constants());
648 }
649 // Delete any cached resolution errors for the constant pool
650 SystemDictionary::delete_resolution_error(constants());
651
652 set_constants(NULL);
653 }
654
655 if (inner_classes() != NULL &&
656 inner_classes() != Universe::the_empty_short_array() &&
657 !inner_classes()->is_shared()) {
658 MetadataFactory::free_array<jushort>(loader_data, inner_classes());
659 }
660 set_inner_classes(NULL);
661
662 if (nest_members() != NULL &&
663 nest_members() != Universe::the_empty_short_array() &&
664 !nest_members()->is_shared()) {
665 MetadataFactory::free_array<jushort>(loader_data, nest_members());
666 }
667 set_nest_members(NULL);
668
669 // We should deallocate the Annotations instance if it's not in shared spaces.
670 if (annotations() != NULL && !annotations()->is_shared()) {
671 MetadataFactory::free_metadata(loader_data, annotations());
672 }
673 set_annotations(NULL);
674
675 if (Arguments::is_dumping_archive()) {
676 SystemDictionaryShared::remove_dumptime_info(this);
677 }
678 }
679
680 bool InstanceKlass::should_be_initialized() const {
681 return !is_initialized();
682 }
683
684 klassItable InstanceKlass::itable() const {
685 return klassItable(const_cast<InstanceKlass*>(this));
686 }
687
688 void InstanceKlass::eager_initialize(Thread *thread) {
689 if (!EagerInitialization) return;
690
691 if (this->is_not_initialized()) {
692 // abort if the the class has a class initializer
693 if (this->class_initializer() != NULL) return;
694
695 // abort if it is java.lang.Object (initialization is handled in genesis)
696 Klass* super_klass = super();
697 if (super_klass == NULL) return;
698
699 // abort if the super class should be initialized
700 if (!InstanceKlass::cast(super_klass)->is_initialized()) return;
701
702 // call body to expose the this pointer
703 eager_initialize_impl();
704 }
705 }
706
707 // JVMTI spec thinks there are signers and protection domain in the
708 // instanceKlass. These accessors pretend these fields are there.
709 // The hprof specification also thinks these fields are in InstanceKlass.
710 oop InstanceKlass::protection_domain() const {
711 // return the protection_domain from the mirror
712 return java_lang_Class::protection_domain(java_mirror());
713 }
714
715 // To remove these from requires an incompatible change and CCC request.
716 objArrayOop InstanceKlass::signers() const {
717 // return the signers from the mirror
718 return java_lang_Class::signers(java_mirror());
719 }
720
721 oop InstanceKlass::init_lock() const {
722 // return the init lock from the mirror
723 oop lock = java_lang_Class::init_lock(java_mirror());
724 // Prevent reordering with any access of initialization state
725 OrderAccess::loadload();
726 assert((oop)lock != NULL || !is_not_initialized(), // initialized or in_error state
727 "only fully initialized state can have a null lock");
728 return lock;
729 }
730
731 // Set the initialization lock to null so the object can be GC'ed. Any racing
732 // threads to get this lock will see a null lock and will not lock.
733 // That's okay because they all check for initialized state after getting
734 // the lock and return.
735 void InstanceKlass::fence_and_clear_init_lock() {
736 // make sure previous stores are all done, notably the init_state.
737 OrderAccess::storestore();
738 java_lang_Class::set_init_lock(java_mirror(), NULL);
739 assert(!is_not_initialized(), "class must be initialized now");
740 }
741
742 void InstanceKlass::eager_initialize_impl() {
743 EXCEPTION_MARK;
744 HandleMark hm(THREAD);
745 Handle h_init_lock(THREAD, init_lock());
746 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
747
748 // abort if someone beat us to the initialization
749 if (!is_not_initialized()) return; // note: not equivalent to is_initialized()
750
751 ClassState old_state = init_state();
752 link_class_impl(THREAD);
753 if (HAS_PENDING_EXCEPTION) {
754 CLEAR_PENDING_EXCEPTION;
755 // Abort if linking the class throws an exception.
756
757 // Use a test to avoid redundantly resetting the state if there's
758 // no change. Set_init_state() asserts that state changes make
759 // progress, whereas here we might just be spinning in place.
760 if (old_state != _init_state)
761 set_init_state(old_state);
762 } else {
763 // linking successfull, mark class as initialized
764 set_init_state(fully_initialized);
765 fence_and_clear_init_lock();
766 // trace
767 if (log_is_enabled(Info, class, init)) {
768 ResourceMark rm(THREAD);
769 log_info(class, init)("[Initialized %s without side effects]", external_name());
770 }
771 }
772 }
773
774
775 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization
776 // process. The step comments refers to the procedure described in that section.
777 // Note: implementation moved to static method to expose the this pointer.
778 void InstanceKlass::initialize(TRAPS) {
779 if (this->should_be_initialized()) {
780 initialize_impl(CHECK);
781 // Note: at this point the class may be initialized
782 // OR it may be in the state of being initialized
783 // in case of recursive initialization!
784 } else {
785 assert(is_initialized(), "sanity check");
786 }
787 }
788
789
790 bool InstanceKlass::verify_code(TRAPS) {
791 // 1) Verify the bytecodes
792 return Verifier::verify(this, should_verify_class(), THREAD);
793 }
794
795 void InstanceKlass::link_class(TRAPS) {
796 assert(is_loaded(), "must be loaded");
797 if (!is_linked()) {
798 link_class_impl(CHECK);
799 }
800 }
801
802 // Called to verify that a class can link during initialization, without
803 // throwing a VerifyError.
804 bool InstanceKlass::link_class_or_fail(TRAPS) {
805 assert(is_loaded(), "must be loaded");
806 if (!is_linked()) {
807 link_class_impl(CHECK_false);
808 }
809 return is_linked();
810 }
811
812 bool InstanceKlass::link_class_impl(TRAPS) {
813 if (DumpSharedSpaces && is_in_error_state()) {
814 // This is for CDS dumping phase only -- we use the in_error_state to indicate that
815 // the class has failed verification. Throwing the NoClassDefFoundError here is just
816 // a convenient way to stop repeat attempts to verify the same (bad) class.
817 //
818 // Note that the NoClassDefFoundError is not part of the JLS, and should not be thrown
819 // if we are executing Java code. This is not a problem for CDS dumping phase since
820 // it doesn't execute any Java code.
821 ResourceMark rm(THREAD);
822 Exceptions::fthrow(THREAD_AND_LOCATION,
823 vmSymbols::java_lang_NoClassDefFoundError(),
824 "Class %s, or one of its supertypes, failed class initialization",
825 external_name());
826 return false;
827 }
828 // return if already verified
829 if (is_linked()) {
830 return true;
831 }
832
833 // Timing
834 // timer handles recursion
835 assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl");
836 JavaThread* jt = (JavaThread*)THREAD;
837
838 // link super class before linking this class
839 Klass* super_klass = super();
840 if (super_klass != NULL) {
841 if (super_klass->is_interface()) { // check if super class is an interface
842 ResourceMark rm(THREAD);
843 Exceptions::fthrow(
844 THREAD_AND_LOCATION,
845 vmSymbols::java_lang_IncompatibleClassChangeError(),
846 "class %s has interface %s as super class",
847 external_name(),
848 super_klass->external_name()
849 );
850 return false;
851 }
852
853 InstanceKlass* ik_super = InstanceKlass::cast(super_klass);
854 ik_super->link_class_impl(CHECK_false);
855 }
856
857 // link all interfaces implemented by this class before linking this class
858 Array<InstanceKlass*>* interfaces = local_interfaces();
859 int num_interfaces = interfaces->length();
860 for (int index = 0; index < num_interfaces; index++) {
861 InstanceKlass* interk = interfaces->at(index);
862 interk->link_class_impl(CHECK_false);
863 }
864
865 // in case the class is linked in the process of linking its superclasses
866 if (is_linked()) {
867 return true;
868 }
869
870 // trace only the link time for this klass that includes
871 // the verification time
872 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
873 ClassLoader::perf_class_link_selftime(),
874 ClassLoader::perf_classes_linked(),
875 jt->get_thread_stat()->perf_recursion_counts_addr(),
876 jt->get_thread_stat()->perf_timers_addr(),
877 PerfClassTraceTime::CLASS_LINK);
878
879 // verification & rewriting
880 {
881 HandleMark hm(THREAD);
882 Handle h_init_lock(THREAD, init_lock());
883 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
884 // rewritten will have been set if loader constraint error found
885 // on an earlier link attempt
886 // don't verify or rewrite if already rewritten
887 //
888
889 if (!is_linked()) {
890 if (!is_rewritten()) {
891 {
892 bool verify_ok = verify_code(THREAD);
893 if (!verify_ok) {
894 return false;
895 }
896 }
897
898 // Just in case a side-effect of verify linked this class already
899 // (which can sometimes happen since the verifier loads classes
900 // using custom class loaders, which are free to initialize things)
901 if (is_linked()) {
902 return true;
903 }
904
905 // also sets rewritten
906 rewrite_class(CHECK_false);
907 } else if (is_shared()) {
908 SystemDictionaryShared::check_verification_constraints(this, CHECK_false);
909 }
910
911 // relocate jsrs and link methods after they are all rewritten
912 link_methods(CHECK_false);
913
914 // Initialize the vtable and interface table after
915 // methods have been rewritten since rewrite may
916 // fabricate new Method*s.
917 // also does loader constraint checking
918 //
919 // initialize_vtable and initialize_itable need to be rerun for
920 // a shared class if the class is not loaded by the NULL classloader.
921 ClassLoaderData * loader_data = class_loader_data();
922 if (!(is_shared() &&
923 loader_data->is_the_null_class_loader_data())) {
924 vtable().initialize_vtable(true, CHECK_false);
925 itable().initialize_itable(true, CHECK_false);
926 }
927 #ifdef ASSERT
928 else {
929 vtable().verify(tty, true);
930 // In case itable verification is ever added.
931 // itable().verify(tty, true);
932 }
933 #endif
934 set_init_state(linked);
935 if (JvmtiExport::should_post_class_prepare()) {
936 Thread *thread = THREAD;
937 assert(thread->is_Java_thread(), "thread->is_Java_thread()");
938 JvmtiExport::post_class_prepare((JavaThread *) thread, this);
939 }
940 }
941 }
942 return true;
943 }
944
945 // Rewrite the byte codes of all of the methods of a class.
946 // The rewriter must be called exactly once. Rewriting must happen after
947 // verification but before the first method of the class is executed.
948 void InstanceKlass::rewrite_class(TRAPS) {
949 assert(is_loaded(), "must be loaded");
950 if (is_rewritten()) {
951 assert(is_shared(), "rewriting an unshared class?");
952 return;
953 }
954 Rewriter::rewrite(this, CHECK);
955 set_rewritten();
956 }
957
958 // Now relocate and link method entry points after class is rewritten.
959 // This is outside is_rewritten flag. In case of an exception, it can be
960 // executed more than once.
961 void InstanceKlass::link_methods(TRAPS) {
962 int len = methods()->length();
963 for (int i = len-1; i >= 0; i--) {
964 methodHandle m(THREAD, methods()->at(i));
965
966 // Set up method entry points for compiler and interpreter .
967 m->link_method(m, CHECK);
968 }
969 }
970
971 // Eagerly initialize superinterfaces that declare default methods (concrete instance: any access)
972 void InstanceKlass::initialize_super_interfaces(TRAPS) {
973 assert (has_nonstatic_concrete_methods(), "caller should have checked this");
974 for (int i = 0; i < local_interfaces()->length(); ++i) {
975 InstanceKlass* ik = local_interfaces()->at(i);
976
977 // Initialization is depth first search ie. we start with top of the inheritance tree
978 // has_nonstatic_concrete_methods drives searching superinterfaces since it
979 // means has_nonstatic_concrete_methods in its superinterface hierarchy
980 if (ik->has_nonstatic_concrete_methods()) {
981 ik->initialize_super_interfaces(CHECK);
982 }
983
984 // Only initialize() interfaces that "declare" concrete methods.
985 if (ik->should_be_initialized() && ik->declares_nonstatic_concrete_methods()) {
986 ik->initialize(CHECK);
987 }
988 }
989 }
990
991 void InstanceKlass::initialize_impl(TRAPS) {
992 HandleMark hm(THREAD);
993
994 // Make sure klass is linked (verified) before initialization
995 // A class could already be verified, since it has been reflected upon.
996 link_class(CHECK);
997
998 DTRACE_CLASSINIT_PROBE(required, -1);
999
1000 bool wait = false;
1001
1002 assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl");
1003 JavaThread* jt = (JavaThread*)THREAD;
1004
1005 // refer to the JVM book page 47 for description of steps
1006 // Step 1
1007 {
1008 Handle h_init_lock(THREAD, init_lock());
1009 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
1010
1011 // Step 2
1012 // If we were to use wait() instead of waitInterruptibly() then
1013 // we might end up throwing IE from link/symbol resolution sites
1014 // that aren't expected to throw. This would wreak havoc. See 6320309.
1015 while (is_being_initialized() && !is_reentrant_initialization(jt)) {
1016 wait = true;
1017 jt->set_class_to_be_initialized(this);
1018 ol.wait_uninterruptibly(jt);
1019 jt->set_class_to_be_initialized(NULL);
1020 }
1021
1022 // Step 3
1023 if (is_being_initialized() && is_reentrant_initialization(jt)) {
1024 DTRACE_CLASSINIT_PROBE_WAIT(recursive, -1, wait);
1025 return;
1026 }
1027
1028 // Step 4
1029 if (is_initialized()) {
1030 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, -1, wait);
1031 return;
1032 }
1033
1034 // Step 5
1035 if (is_in_error_state()) {
1036 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait);
1037 ResourceMark rm(THREAD);
1038 const char* desc = "Could not initialize class ";
1039 const char* className = external_name();
1040 size_t msglen = strlen(desc) + strlen(className) + 1;
1041 char* message = NEW_RESOURCE_ARRAY(char, msglen);
1042 if (NULL == message) {
1043 // Out of memory: can't create detailed error message
1044 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className);
1045 } else {
1046 jio_snprintf(message, msglen, "%s%s", desc, className);
1047 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message);
1048 }
1049 }
1050
1051 // Step 6
1052 set_init_state(being_initialized);
1053 set_init_thread(jt);
1054 }
1055
1056 // Step 7
1057 // Next, if C is a class rather than an interface, initialize it's super class and super
1058 // interfaces.
1059 if (!is_interface()) {
1060 Klass* super_klass = super();
1061 if (super_klass != NULL && super_klass->should_be_initialized()) {
1062 super_klass->initialize(THREAD);
1063 }
1064 // If C implements any interface that declares a non-static, concrete method,
1065 // the initialization of C triggers initialization of its super interfaces.
1066 // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and
1067 // having a superinterface that declares, non-static, concrete methods
1068 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) {
1069 initialize_super_interfaces(THREAD);
1070 }
1071
1072 // If any exceptions, complete abruptly, throwing the same exception as above.
1073 if (HAS_PENDING_EXCEPTION) {
1074 Handle e(THREAD, PENDING_EXCEPTION);
1075 CLEAR_PENDING_EXCEPTION;
1076 {
1077 EXCEPTION_MARK;
1078 // Locks object, set state, and notify all waiting threads
1079 set_initialization_state_and_notify(initialization_error, THREAD);
1080 CLEAR_PENDING_EXCEPTION;
1081 }
1082 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait);
1083 THROW_OOP(e());
1084 }
1085 }
1086
1087
1088 // Look for aot compiled methods for this klass, including class initializer.
1089 AOTLoader::load_for_klass(this, THREAD);
1090
1091 // Step 8
1092 {
1093 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
1094 // Timer includes any side effects of class initialization (resolution,
1095 // etc), but not recursive entry into call_class_initializer().
1096 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
1097 ClassLoader::perf_class_init_selftime(),
1098 ClassLoader::perf_classes_inited(),
1099 jt->get_thread_stat()->perf_recursion_counts_addr(),
1100 jt->get_thread_stat()->perf_timers_addr(),
1101 PerfClassTraceTime::CLASS_CLINIT);
1102 call_class_initializer(THREAD);
1103 }
1104
1105 // Step 9
1106 if (!HAS_PENDING_EXCEPTION) {
1107 set_initialization_state_and_notify(fully_initialized, CHECK);
1108 {
1109 debug_only(vtable().verify(tty, true);)
1110 }
1111 }
1112 else {
1113 // Step 10 and 11
1114 Handle e(THREAD, PENDING_EXCEPTION);
1115 CLEAR_PENDING_EXCEPTION;
1116 // JVMTI has already reported the pending exception
1117 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1118 JvmtiExport::clear_detected_exception(jt);
1119 {
1120 EXCEPTION_MARK;
1121 set_initialization_state_and_notify(initialization_error, THREAD);
1122 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below
1123 // JVMTI has already reported the pending exception
1124 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1125 JvmtiExport::clear_detected_exception(jt);
1126 }
1127 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
1128 if (e->is_a(SystemDictionary::Error_klass())) {
1129 THROW_OOP(e());
1130 } else {
1131 JavaCallArguments args(e);
1132 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
1133 vmSymbols::throwable_void_signature(),
1134 &args);
1135 }
1136 }
1137 DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait);
1138 }
1139
1140
1141 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) {
1142 Handle h_init_lock(THREAD, init_lock());
1143 if (h_init_lock() != NULL) {
1144 ObjectLocker ol(h_init_lock, THREAD);
1145 set_init_thread(NULL); // reset _init_thread before changing _init_state
1146 set_init_state(state);
1147 fence_and_clear_init_lock();
1148 ol.notify_all(CHECK);
1149 } else {
1150 assert(h_init_lock() != NULL, "The initialization state should never be set twice");
1151 set_init_thread(NULL); // reset _init_thread before changing _init_state
1152 set_init_state(state);
1153 }
1154 }
1155
1156 Klass* InstanceKlass::implementor() const {
1157 Klass* volatile* k = adr_implementor();
1158 if (k == NULL) {
1159 return NULL;
1160 } else {
1161 // This load races with inserts, and therefore needs acquire.
1162 Klass* kls = Atomic::load_acquire(k);
1163 if (kls != NULL && !kls->is_loader_alive()) {
1164 return NULL; // don't return unloaded class
1165 } else {
1166 return kls;
1167 }
1168 }
1169 }
1170
1171
1172 void InstanceKlass::set_implementor(Klass* k) {
1173 assert_locked_or_safepoint(Compile_lock);
1174 assert(is_interface(), "not interface");
1175 Klass* volatile* addr = adr_implementor();
1176 assert(addr != NULL, "null addr");
1177 if (addr != NULL) {
1178 Atomic::release_store(addr, k);
1179 }
1180 }
1181
1182 int InstanceKlass::nof_implementors() const {
1183 Klass* k = implementor();
1184 if (k == NULL) {
1185 return 0;
1186 } else if (k != this) {
1187 return 1;
1188 } else {
1189 return 2;
1190 }
1191 }
1192
1193 // The embedded _implementor field can only record one implementor.
1194 // When there are more than one implementors, the _implementor field
1195 // is set to the interface Klass* itself. Following are the possible
1196 // values for the _implementor field:
1197 // NULL - no implementor
1198 // implementor Klass* - one implementor
1199 // self - more than one implementor
1200 //
1201 // The _implementor field only exists for interfaces.
1202 void InstanceKlass::add_implementor(Klass* k) {
1203 assert_lock_strong(Compile_lock);
1204 assert(is_interface(), "not interface");
1205 // Filter out my subinterfaces.
1206 // (Note: Interfaces are never on the subklass list.)
1207 if (InstanceKlass::cast(k)->is_interface()) return;
1208
1209 // Filter out subclasses whose supers already implement me.
1210 // (Note: CHA must walk subclasses of direct implementors
1211 // in order to locate indirect implementors.)
1212 Klass* sk = k->super();
1213 if (sk != NULL && InstanceKlass::cast(sk)->implements_interface(this))
1214 // We only need to check one immediate superclass, since the
1215 // implements_interface query looks at transitive_interfaces.
1216 // Any supers of the super have the same (or fewer) transitive_interfaces.
1217 return;
1218
1219 Klass* ik = implementor();
1220 if (ik == NULL) {
1221 set_implementor(k);
1222 } else if (ik != this) {
1223 // There is already an implementor. Use itself as an indicator of
1224 // more than one implementors.
1225 set_implementor(this);
1226 }
1227
1228 // The implementor also implements the transitive_interfaces
1229 for (int index = 0; index < local_interfaces()->length(); index++) {
1230 InstanceKlass::cast(local_interfaces()->at(index))->add_implementor(k);
1231 }
1232 }
1233
1234 void InstanceKlass::init_implementor() {
1235 if (is_interface()) {
1236 set_implementor(NULL);
1237 }
1238 }
1239
1240
1241 void InstanceKlass::process_interfaces(Thread *thread) {
1242 // link this class into the implementors list of every interface it implements
1243 for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
1244 assert(local_interfaces()->at(i)->is_klass(), "must be a klass");
1245 InstanceKlass* interf = InstanceKlass::cast(local_interfaces()->at(i));
1246 assert(interf->is_interface(), "expected interface");
1247 interf->add_implementor(this);
1248 }
1249 }
1250
1251 bool InstanceKlass::can_be_primary_super_slow() const {
1252 if (is_interface())
1253 return false;
1254 else
1255 return Klass::can_be_primary_super_slow();
1256 }
1257
1258 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots,
1259 Array<InstanceKlass*>* transitive_interfaces) {
1260 // The secondaries are the implemented interfaces.
1261 Array<InstanceKlass*>* interfaces = transitive_interfaces;
1262 int num_secondaries = num_extra_slots + interfaces->length();
1263 if (num_secondaries == 0) {
1264 // Must share this for correct bootstrapping!
1265 set_secondary_supers(Universe::the_empty_klass_array());
1266 return NULL;
1267 } else if (num_extra_slots == 0) {
1268 // The secondary super list is exactly the same as the transitive interfaces, so
1269 // let's use it instead of making a copy.
1270 // Redefine classes has to be careful not to delete this!
1271 // We need the cast because Array<Klass*> is NOT a supertype of Array<InstanceKlass*>,
1272 // (but it's safe to do here because we won't write into _secondary_supers from this point on).
1273 set_secondary_supers((Array<Klass*>*)(address)interfaces);
1274 return NULL;
1275 } else {
1276 // Copy transitive interfaces to a temporary growable array to be constructed
1277 // into the secondary super list with extra slots.
1278 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length());
1279 for (int i = 0; i < interfaces->length(); i++) {
1280 secondaries->push(interfaces->at(i));
1281 }
1282 return secondaries;
1283 }
1284 }
1285
1286 bool InstanceKlass::implements_interface(Klass* k) const {
1287 if (this == k) return true;
1288 assert(k->is_interface(), "should be an interface class");
1289 for (int i = 0; i < transitive_interfaces()->length(); i++) {
1290 if (transitive_interfaces()->at(i) == k) {
1291 return true;
1292 }
1293 }
1294 return false;
1295 }
1296
1297 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const {
1298 // Verify direct super interface
1299 if (this == k) return true;
1300 assert(k->is_interface(), "should be an interface class");
1301 for (int i = 0; i < local_interfaces()->length(); i++) {
1302 if (local_interfaces()->at(i) == k) {
1303 return true;
1304 }
1305 }
1306 return false;
1307 }
1308
1309 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) {
1310 check_array_allocation_length(length, arrayOopDesc::max_array_length(T_OBJECT), CHECK_NULL);
1311 int size = objArrayOopDesc::object_size(length);
1312 Klass* ak = array_klass(n, CHECK_NULL);
1313 objArrayOop o = (objArrayOop)Universe::heap()->array_allocate(ak, size, length,
1314 /* do_zero */ true, CHECK_NULL);
1315 return o;
1316 }
1317
1318 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
1319 if (TraceFinalizerRegistration) {
1320 tty->print("Registered ");
1321 i->print_value_on(tty);
1322 tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", p2i(i));
1323 }
1324 instanceHandle h_i(THREAD, i);
1325 // Pass the handle as argument, JavaCalls::call expects oop as jobjects
1326 JavaValue result(T_VOID);
1327 JavaCallArguments args(h_i);
1328 methodHandle mh (THREAD, Universe::finalizer_register_method());
1329 JavaCalls::call(&result, mh, &args, CHECK_NULL);
1330 return h_i();
1331 }
1332
1333 instanceOop InstanceKlass::allocate_instance(TRAPS) {
1334 bool has_finalizer_flag = has_finalizer(); // Query before possible GC
1335 int size = size_helper(); // Query before forming handle.
1336
1337 instanceOop i;
1338
1339 i = (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL);
1340 if (has_finalizer_flag && !RegisterFinalizersAtInit) {
1341 i = register_finalizer(i, CHECK_NULL);
1342 }
1343 return i;
1344 }
1345
1346 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) {
1347 return instanceHandle(THREAD, allocate_instance(THREAD));
1348 }
1349
1350 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1351 if (is_interface() || is_abstract()) {
1352 ResourceMark rm(THREAD);
1353 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1354 : vmSymbols::java_lang_InstantiationException(), external_name());
1355 }
1356 if (this == SystemDictionary::Class_klass()) {
1357 ResourceMark rm(THREAD);
1358 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1359 : vmSymbols::java_lang_IllegalAccessException(), external_name());
1360 }
1361 }
1362
1363 Klass* InstanceKlass::array_klass_impl(bool or_null, int n, TRAPS) {
1364 // Need load-acquire for lock-free read
1365 if (array_klasses_acquire() == NULL) {
1366 if (or_null) return NULL;
1367
1368 ResourceMark rm;
1369 JavaThread *jt = (JavaThread *)THREAD;
1370 {
1371 // Atomic creation of array_klasses
1372 MutexLocker ma(MultiArray_lock, THREAD);
1373
1374 // Check if update has already taken place
1375 if (array_klasses() == NULL) {
1376 Klass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this, CHECK_NULL);
1377 // use 'release' to pair with lock-free load
1378 release_set_array_klasses(k);
1379 }
1380 }
1381 }
1382 // _this will always be set at this point
1383 ObjArrayKlass* oak = (ObjArrayKlass*)array_klasses();
1384 if (or_null) {
1385 return oak->array_klass_or_null(n);
1386 }
1387 return oak->array_klass(n, THREAD);
1388 }
1389
1390 Klass* InstanceKlass::array_klass_impl(bool or_null, TRAPS) {
1391 return array_klass_impl(or_null, 1, THREAD);
1392 }
1393
1394 static int call_class_initializer_counter = 0; // for debugging
1395
1396 Method* InstanceKlass::class_initializer() const {
1397 Method* clinit = find_method(
1398 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1399 if (clinit != NULL && clinit->has_valid_initializer_flags()) {
1400 return clinit;
1401 }
1402 return NULL;
1403 }
1404
1405 void InstanceKlass::call_class_initializer(TRAPS) {
1406 if (ReplayCompiles &&
1407 (ReplaySuppressInitializers == 1 ||
1408 (ReplaySuppressInitializers >= 2 && class_loader() != NULL))) {
1409 // Hide the existence of the initializer for the purpose of replaying the compile
1410 return;
1411 }
1412
1413 methodHandle h_method(THREAD, class_initializer());
1414 assert(!is_initialized(), "we cannot initialize twice");
1415 LogTarget(Info, class, init) lt;
1416 if (lt.is_enabled()) {
1417 ResourceMark rm;
1418 LogStream ls(lt);
1419 ls.print("%d Initializing ", call_class_initializer_counter++);
1420 name()->print_value_on(&ls);
1421 ls.print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", p2i(this));
1422 }
1423 if (h_method() != NULL) {
1424 JavaCallArguments args; // No arguments
1425 JavaValue result(T_VOID);
1426 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1427 }
1428 }
1429
1430
1431 void InstanceKlass::mask_for(const methodHandle& method, int bci,
1432 InterpreterOopMap* entry_for) {
1433 // Lazily create the _oop_map_cache at first request
1434 // Lock-free access requires load_acquire.
1435 OopMapCache* oop_map_cache = Atomic::load_acquire(&_oop_map_cache);
1436 if (oop_map_cache == NULL) {
1437 MutexLocker x(OopMapCacheAlloc_lock);
1438 // Check if _oop_map_cache was allocated while we were waiting for this lock
1439 if ((oop_map_cache = _oop_map_cache) == NULL) {
1440 oop_map_cache = new OopMapCache();
1441 // Ensure _oop_map_cache is stable, since it is examined without a lock
1442 Atomic::release_store(&_oop_map_cache, oop_map_cache);
1443 }
1444 }
1445 // _oop_map_cache is constant after init; lookup below does its own locking.
1446 oop_map_cache->lookup(method, bci, entry_for);
1447 }
1448
1449
1450 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1451 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1452 Symbol* f_name = fs.name();
1453 Symbol* f_sig = fs.signature();
1454 if (f_name == name && f_sig == sig) {
1455 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1456 return true;
1457 }
1458 }
1459 return false;
1460 }
1461
1462
1463 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1464 const int n = local_interfaces()->length();
1465 for (int i = 0; i < n; i++) {
1466 Klass* intf1 = local_interfaces()->at(i);
1467 assert(intf1->is_interface(), "just checking type");
1468 // search for field in current interface
1469 if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) {
1470 assert(fd->is_static(), "interface field must be static");
1471 return intf1;
1472 }
1473 // search for field in direct superinterfaces
1474 Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd);
1475 if (intf2 != NULL) return intf2;
1476 }
1477 // otherwise field lookup fails
1478 return NULL;
1479 }
1480
1481
1482 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1483 // search order according to newest JVM spec (5.4.3.2, p.167).
1484 // 1) search for field in current klass
1485 if (find_local_field(name, sig, fd)) {
1486 return const_cast<InstanceKlass*>(this);
1487 }
1488 // 2) search for field recursively in direct superinterfaces
1489 { Klass* intf = find_interface_field(name, sig, fd);
1490 if (intf != NULL) return intf;
1491 }
1492 // 3) apply field lookup recursively if superclass exists
1493 { Klass* supr = super();
1494 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, fd);
1495 }
1496 // 4) otherwise field lookup fails
1497 return NULL;
1498 }
1499
1500
1501 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
1502 // search order according to newest JVM spec (5.4.3.2, p.167).
1503 // 1) search for field in current klass
1504 if (find_local_field(name, sig, fd)) {
1505 if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
1506 }
1507 // 2) search for field recursively in direct superinterfaces
1508 if (is_static) {
1509 Klass* intf = find_interface_field(name, sig, fd);
1510 if (intf != NULL) return intf;
1511 }
1512 // 3) apply field lookup recursively if superclass exists
1513 { Klass* supr = super();
1514 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd);
1515 }
1516 // 4) otherwise field lookup fails
1517 return NULL;
1518 }
1519
1520
1521 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1522 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1523 if (fs.offset() == offset) {
1524 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1525 if (fd->is_static() == is_static) return true;
1526 }
1527 }
1528 return false;
1529 }
1530
1531
1532 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1533 Klass* klass = const_cast<InstanceKlass*>(this);
1534 while (klass != NULL) {
1535 if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) {
1536 return true;
1537 }
1538 klass = klass->super();
1539 }
1540 return false;
1541 }
1542
1543
1544 void InstanceKlass::methods_do(void f(Method* method)) {
1545 // Methods aren't stable until they are loaded. This can be read outside
1546 // a lock through the ClassLoaderData for profiling
1547 if (!is_loaded()) {
1548 return;
1549 }
1550
1551 int len = methods()->length();
1552 for (int index = 0; index < len; index++) {
1553 Method* m = methods()->at(index);
1554 assert(m->is_method(), "must be method");
1555 f(m);
1556 }
1557 }
1558
1559
1560 void InstanceKlass::do_local_static_fields(FieldClosure* cl) {
1561 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1562 if (fs.access_flags().is_static()) {
1563 fieldDescriptor& fd = fs.field_descriptor();
1564 cl->do_field(&fd);
1565 }
1566 }
1567 }
1568
1569
1570 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) {
1571 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1572 if (fs.access_flags().is_static()) {
1573 fieldDescriptor& fd = fs.field_descriptor();
1574 f(&fd, mirror, CHECK);
1575 }
1576 }
1577 }
1578
1579
1580 static int compare_fields_by_offset(int* a, int* b) {
1581 return a[0] - b[0];
1582 }
1583
1584 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) {
1585 InstanceKlass* super = superklass();
1586 if (super != NULL) {
1587 super->do_nonstatic_fields(cl);
1588 }
1589 fieldDescriptor fd;
1590 int length = java_fields_count();
1591 // In DebugInfo nonstatic fields are sorted by offset.
1592 int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1), mtClass);
1593 int j = 0;
1594 for (int i = 0; i < length; i += 1) {
1595 fd.reinitialize(this, i);
1596 if (!fd.is_static()) {
1597 fields_sorted[j + 0] = fd.offset();
1598 fields_sorted[j + 1] = i;
1599 j += 2;
1600 }
1601 }
1602 if (j > 0) {
1603 length = j;
1604 // _sort_Fn is defined in growableArray.hpp.
1605 qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset);
1606 for (int i = 0; i < length; i += 2) {
1607 fd.reinitialize(this, fields_sorted[i + 1]);
1608 assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields");
1609 cl->do_field(&fd);
1610 }
1611 }
1612 FREE_C_HEAP_ARRAY(int, fields_sorted);
1613 }
1614
1615
1616 void InstanceKlass::array_klasses_do(void f(Klass* k, TRAPS), TRAPS) {
1617 if (array_klasses() != NULL)
1618 ArrayKlass::cast(array_klasses())->array_klasses_do(f, THREAD);
1619 }
1620
1621 void InstanceKlass::array_klasses_do(void f(Klass* k)) {
1622 if (array_klasses() != NULL)
1623 ArrayKlass::cast(array_klasses())->array_klasses_do(f);
1624 }
1625
1626 #ifdef ASSERT
1627 static int linear_search(const Array<Method*>* methods,
1628 const Symbol* name,
1629 const Symbol* signature) {
1630 const int len = methods->length();
1631 for (int index = 0; index < len; index++) {
1632 const Method* const m = methods->at(index);
1633 assert(m->is_method(), "must be method");
1634 if (m->signature() == signature && m->name() == name) {
1635 return index;
1636 }
1637 }
1638 return -1;
1639 }
1640 #endif
1641
1642 bool InstanceKlass::_disable_method_binary_search = false;
1643
1644 int InstanceKlass::quick_search(const Array<Method*>* methods, const Symbol* name) {
1645 int len = methods->length();
1646 int l = 0;
1647 int h = len - 1;
1648
1649 if (_disable_method_binary_search) {
1650 // At the final stage of dynamic dumping, the methods array may not be sorted
1651 // by ascending addresses of their names, so we can't use binary search anymore.
1652 // However, methods with the same name are still laid out consecutively inside the
1653 // methods array, so let's look for the first one that matches.
1654 assert(DynamicDumpSharedSpaces, "must be");
1655 while (l <= h) {
1656 Method* m = methods->at(l);
1657 if (m->name() == name) {
1658 return l;
1659 }
1660 l ++;
1661 }
1662 return -1;
1663 }
1664
1665 // methods are sorted by ascending addresses of their names, so do binary search
1666 while (l <= h) {
1667 int mid = (l + h) >> 1;
1668 Method* m = methods->at(mid);
1669 assert(m->is_method(), "must be method");
1670 int res = m->name()->fast_compare(name);
1671 if (res == 0) {
1672 return mid;
1673 } else if (res < 0) {
1674 l = mid + 1;
1675 } else {
1676 h = mid - 1;
1677 }
1678 }
1679 return -1;
1680 }
1681
1682 // find_method looks up the name/signature in the local methods array
1683 Method* InstanceKlass::find_method(const Symbol* name,
1684 const Symbol* signature) const {
1685 return find_method_impl(name, signature, find_overpass, find_static, find_private);
1686 }
1687
1688 Method* InstanceKlass::find_method_impl(const Symbol* name,
1689 const Symbol* signature,
1690 OverpassLookupMode overpass_mode,
1691 StaticLookupMode static_mode,
1692 PrivateLookupMode private_mode) const {
1693 return InstanceKlass::find_method_impl(methods(),
1694 name,
1695 signature,
1696 overpass_mode,
1697 static_mode,
1698 private_mode);
1699 }
1700
1701 // find_instance_method looks up the name/signature in the local methods array
1702 // and skips over static methods
1703 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods,
1704 const Symbol* name,
1705 const Symbol* signature,
1706 PrivateLookupMode private_mode) {
1707 Method* const meth = InstanceKlass::find_method_impl(methods,
1708 name,
1709 signature,
1710 find_overpass,
1711 skip_static,
1712 private_mode);
1713 assert(((meth == NULL) || !meth->is_static()),
1714 "find_instance_method should have skipped statics");
1715 return meth;
1716 }
1717
1718 // find_instance_method looks up the name/signature in the local methods array
1719 // and skips over static methods
1720 Method* InstanceKlass::find_instance_method(const Symbol* name,
1721 const Symbol* signature,
1722 PrivateLookupMode private_mode) const {
1723 return InstanceKlass::find_instance_method(methods(), name, signature, private_mode);
1724 }
1725
1726 // Find looks up the name/signature in the local methods array
1727 // and filters on the overpass, static and private flags
1728 // This returns the first one found
1729 // note that the local methods array can have up to one overpass, one static
1730 // and one instance (private or not) with the same name/signature
1731 Method* InstanceKlass::find_local_method(const Symbol* name,
1732 const Symbol* signature,
1733 OverpassLookupMode overpass_mode,
1734 StaticLookupMode static_mode,
1735 PrivateLookupMode private_mode) const {
1736 return InstanceKlass::find_method_impl(methods(),
1737 name,
1738 signature,
1739 overpass_mode,
1740 static_mode,
1741 private_mode);
1742 }
1743
1744 // Find looks up the name/signature in the local methods array
1745 // and filters on the overpass, static and private flags
1746 // This returns the first one found
1747 // note that the local methods array can have up to one overpass, one static
1748 // and one instance (private or not) with the same name/signature
1749 Method* InstanceKlass::find_local_method(const Array<Method*>* methods,
1750 const Symbol* name,
1751 const Symbol* signature,
1752 OverpassLookupMode overpass_mode,
1753 StaticLookupMode static_mode,
1754 PrivateLookupMode private_mode) {
1755 return InstanceKlass::find_method_impl(methods,
1756 name,
1757 signature,
1758 overpass_mode,
1759 static_mode,
1760 private_mode);
1761 }
1762
1763 Method* InstanceKlass::find_method(const Array<Method*>* methods,
1764 const Symbol* name,
1765 const Symbol* signature) {
1766 return InstanceKlass::find_method_impl(methods,
1767 name,
1768 signature,
1769 find_overpass,
1770 find_static,
1771 find_private);
1772 }
1773
1774 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods,
1775 const Symbol* name,
1776 const Symbol* signature,
1777 OverpassLookupMode overpass_mode,
1778 StaticLookupMode static_mode,
1779 PrivateLookupMode private_mode) {
1780 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode);
1781 return hit >= 0 ? methods->at(hit): NULL;
1782 }
1783
1784 // true if method matches signature and conforms to skipping_X conditions.
1785 static bool method_matches(const Method* m,
1786 const Symbol* signature,
1787 bool skipping_overpass,
1788 bool skipping_static,
1789 bool skipping_private) {
1790 return ((m->signature() == signature) &&
1791 (!skipping_overpass || !m->is_overpass()) &&
1792 (!skipping_static || !m->is_static()) &&
1793 (!skipping_private || !m->is_private()));
1794 }
1795
1796 // Used directly for default_methods to find the index into the
1797 // default_vtable_indices, and indirectly by find_method
1798 // find_method_index looks in the local methods array to return the index
1799 // of the matching name/signature. If, overpass methods are being ignored,
1800 // the search continues to find a potential non-overpass match. This capability
1801 // is important during method resolution to prefer a static method, for example,
1802 // over an overpass method.
1803 // There is the possibility in any _method's array to have the same name/signature
1804 // for a static method, an overpass method and a local instance method
1805 // To correctly catch a given method, the search criteria may need
1806 // to explicitly skip the other two. For local instance methods, it
1807 // is often necessary to skip private methods
1808 int InstanceKlass::find_method_index(const Array<Method*>* methods,
1809 const Symbol* name,
1810 const Symbol* signature,
1811 OverpassLookupMode overpass_mode,
1812 StaticLookupMode static_mode,
1813 PrivateLookupMode private_mode) {
1814 const bool skipping_overpass = (overpass_mode == skip_overpass);
1815 const bool skipping_static = (static_mode == skip_static);
1816 const bool skipping_private = (private_mode == skip_private);
1817 const int hit = quick_search(methods, name);
1818 if (hit != -1) {
1819 const Method* const m = methods->at(hit);
1820
1821 // Do linear search to find matching signature. First, quick check
1822 // for common case, ignoring overpasses if requested.
1823 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1824 return hit;
1825 }
1826
1827 // search downwards through overloaded methods
1828 int i;
1829 for (i = hit - 1; i >= 0; --i) {
1830 const Method* const m = methods->at(i);
1831 assert(m->is_method(), "must be method");
1832 if (m->name() != name) {
1833 break;
1834 }
1835 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1836 return i;
1837 }
1838 }
1839 // search upwards
1840 for (i = hit + 1; i < methods->length(); ++i) {
1841 const Method* const m = methods->at(i);
1842 assert(m->is_method(), "must be method");
1843 if (m->name() != name) {
1844 break;
1845 }
1846 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1847 return i;
1848 }
1849 }
1850 // not found
1851 #ifdef ASSERT
1852 const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 :
1853 linear_search(methods, name, signature);
1854 assert(-1 == index, "binary search should have found entry %d", index);
1855 #endif
1856 }
1857 return -1;
1858 }
1859
1860 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const {
1861 return find_method_by_name(methods(), name, end);
1862 }
1863
1864 int InstanceKlass::find_method_by_name(const Array<Method*>* methods,
1865 const Symbol* name,
1866 int* end_ptr) {
1867 assert(end_ptr != NULL, "just checking");
1868 int start = quick_search(methods, name);
1869 int end = start + 1;
1870 if (start != -1) {
1871 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
1872 while (end < methods->length() && (methods->at(end))->name() == name) ++end;
1873 *end_ptr = end;
1874 return start;
1875 }
1876 return -1;
1877 }
1878
1879 // uncached_lookup_method searches both the local class methods array and all
1880 // superclasses methods arrays, skipping any overpass methods in superclasses,
1881 // and possibly skipping private methods.
1882 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
1883 const Symbol* signature,
1884 OverpassLookupMode overpass_mode,
1885 PrivateLookupMode private_mode) const {
1886 OverpassLookupMode overpass_local_mode = overpass_mode;
1887 const Klass* klass = this;
1888 while (klass != NULL) {
1889 Method* const method = InstanceKlass::cast(klass)->find_method_impl(name,
1890 signature,
1891 overpass_local_mode,
1892 find_static,
1893 private_mode);
1894 if (method != NULL) {
1895 return method;
1896 }
1897 klass = klass->super();
1898 overpass_local_mode = skip_overpass; // Always ignore overpass methods in superclasses
1899 }
1900 return NULL;
1901 }
1902
1903 #ifdef ASSERT
1904 // search through class hierarchy and return true if this class or
1905 // one of the superclasses was redefined
1906 bool InstanceKlass::has_redefined_this_or_super() const {
1907 const Klass* klass = this;
1908 while (klass != NULL) {
1909 if (InstanceKlass::cast(klass)->has_been_redefined()) {
1910 return true;
1911 }
1912 klass = klass->super();
1913 }
1914 return false;
1915 }
1916 #endif
1917
1918 // lookup a method in the default methods list then in all transitive interfaces
1919 // Do NOT return private or static methods
1920 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
1921 Symbol* signature) const {
1922 Method* m = NULL;
1923 if (default_methods() != NULL) {
1924 m = find_method(default_methods(), name, signature);
1925 }
1926 // Look up interfaces
1927 if (m == NULL) {
1928 m = lookup_method_in_all_interfaces(name, signature, find_defaults);
1929 }
1930 return m;
1931 }
1932
1933 // lookup a method in all the interfaces that this class implements
1934 // Do NOT return private or static methods, new in JDK8 which are not externally visible
1935 // They should only be found in the initial InterfaceMethodRef
1936 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
1937 Symbol* signature,
1938 DefaultsLookupMode defaults_mode) const {
1939 Array<InstanceKlass*>* all_ifs = transitive_interfaces();
1940 int num_ifs = all_ifs->length();
1941 InstanceKlass *ik = NULL;
1942 for (int i = 0; i < num_ifs; i++) {
1943 ik = all_ifs->at(i);
1944 Method* m = ik->lookup_method(name, signature);
1945 if (m != NULL && m->is_public() && !m->is_static() &&
1946 ((defaults_mode != skip_defaults) || !m->is_default_method())) {
1947 return m;
1948 }
1949 }
1950 return NULL;
1951 }
1952
1953 /* jni_id_for_impl for jfieldIds only */
1954 JNIid* InstanceKlass::jni_id_for_impl(int offset) {
1955 MutexLocker ml(JfieldIdCreation_lock);
1956 // Retry lookup after we got the lock
1957 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
1958 if (probe == NULL) {
1959 // Slow case, allocate new static field identifier
1960 probe = new JNIid(this, offset, jni_ids());
1961 set_jni_ids(probe);
1962 }
1963 return probe;
1964 }
1965
1966
1967 /* jni_id_for for jfieldIds only */
1968 JNIid* InstanceKlass::jni_id_for(int offset) {
1969 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
1970 if (probe == NULL) {
1971 probe = jni_id_for_impl(offset);
1972 }
1973 return probe;
1974 }
1975
1976 u2 InstanceKlass::enclosing_method_data(int offset) const {
1977 const Array<jushort>* const inner_class_list = inner_classes();
1978 if (inner_class_list == NULL) {
1979 return 0;
1980 }
1981 const int length = inner_class_list->length();
1982 if (length % inner_class_next_offset == 0) {
1983 return 0;
1984 }
1985 const int index = length - enclosing_method_attribute_size;
1986 assert(offset < enclosing_method_attribute_size, "invalid offset");
1987 return inner_class_list->at(index + offset);
1988 }
1989
1990 void InstanceKlass::set_enclosing_method_indices(u2 class_index,
1991 u2 method_index) {
1992 Array<jushort>* inner_class_list = inner_classes();
1993 assert (inner_class_list != NULL, "_inner_classes list is not set up");
1994 int length = inner_class_list->length();
1995 if (length % inner_class_next_offset == enclosing_method_attribute_size) {
1996 int index = length - enclosing_method_attribute_size;
1997 inner_class_list->at_put(
1998 index + enclosing_method_class_index_offset, class_index);
1999 inner_class_list->at_put(
2000 index + enclosing_method_method_index_offset, method_index);
2001 }
2002 }
2003
2004 // Lookup or create a jmethodID.
2005 // This code is called by the VMThread and JavaThreads so the
2006 // locking has to be done very carefully to avoid deadlocks
2007 // and/or other cache consistency problems.
2008 //
2009 jmethodID InstanceKlass::get_jmethod_id(const methodHandle& method_h) {
2010 size_t idnum = (size_t)method_h->method_idnum();
2011 jmethodID* jmeths = methods_jmethod_ids_acquire();
2012 size_t length = 0;
2013 jmethodID id = NULL;
2014
2015 // We use a double-check locking idiom here because this cache is
2016 // performance sensitive. In the normal system, this cache only
2017 // transitions from NULL to non-NULL which is safe because we use
2018 // release_set_methods_jmethod_ids() to advertise the new cache.
2019 // A partially constructed cache should never be seen by a racing
2020 // thread. We also use release_store() to save a new jmethodID
2021 // in the cache so a partially constructed jmethodID should never be
2022 // seen either. Cache reads of existing jmethodIDs proceed without a
2023 // lock, but cache writes of a new jmethodID requires uniqueness and
2024 // creation of the cache itself requires no leaks so a lock is
2025 // generally acquired in those two cases.
2026 //
2027 // If the RedefineClasses() API has been used, then this cache can
2028 // grow and we'll have transitions from non-NULL to bigger non-NULL.
2029 // Cache creation requires no leaks and we require safety between all
2030 // cache accesses and freeing of the old cache so a lock is generally
2031 // acquired when the RedefineClasses() API has been used.
2032
2033 if (jmeths != NULL) {
2034 // the cache already exists
2035 if (!idnum_can_increment()) {
2036 // the cache can't grow so we can just get the current values
2037 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2038 } else {
2039 // cache can grow so we have to be more careful
2040 if (Threads::number_of_threads() == 0 ||
2041 SafepointSynchronize::is_at_safepoint()) {
2042 // we're single threaded or at a safepoint - no locking needed
2043 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2044 } else {
2045 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2046 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2047 }
2048 }
2049 }
2050 // implied else:
2051 // we need to allocate a cache so default length and id values are good
2052
2053 if (jmeths == NULL || // no cache yet
2054 length <= idnum || // cache is too short
2055 id == NULL) { // cache doesn't contain entry
2056
2057 // This function can be called by the VMThread so we have to do all
2058 // things that might block on a safepoint before grabbing the lock.
2059 // Otherwise, we can deadlock with the VMThread or have a cache
2060 // consistency issue. These vars keep track of what we might have
2061 // to free after the lock is dropped.
2062 jmethodID to_dealloc_id = NULL;
2063 jmethodID* to_dealloc_jmeths = NULL;
2064
2065 // may not allocate new_jmeths or use it if we allocate it
2066 jmethodID* new_jmeths = NULL;
2067 if (length <= idnum) {
2068 // allocate a new cache that might be used
2069 size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count());
2070 new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1, mtClass);
2071 memset(new_jmeths, 0, (size+1)*sizeof(jmethodID));
2072 // cache size is stored in element[0], other elements offset by one
2073 new_jmeths[0] = (jmethodID)size;
2074 }
2075
2076 // allocate a new jmethodID that might be used
2077 jmethodID new_id = NULL;
2078 if (method_h->is_old() && !method_h->is_obsolete()) {
2079 // The method passed in is old (but not obsolete), we need to use the current version
2080 Method* current_method = method_with_idnum((int)idnum);
2081 assert(current_method != NULL, "old and but not obsolete, so should exist");
2082 new_id = Method::make_jmethod_id(class_loader_data(), current_method);
2083 } else {
2084 // It is the current version of the method or an obsolete method,
2085 // use the version passed in
2086 new_id = Method::make_jmethod_id(class_loader_data(), method_h());
2087 }
2088
2089 if (Threads::number_of_threads() == 0 ||
2090 SafepointSynchronize::is_at_safepoint()) {
2091 // we're single threaded or at a safepoint - no locking needed
2092 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2093 &to_dealloc_id, &to_dealloc_jmeths);
2094 } else {
2095 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2096 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2097 &to_dealloc_id, &to_dealloc_jmeths);
2098 }
2099
2100 // The lock has been dropped so we can free resources.
2101 // Free up either the old cache or the new cache if we allocated one.
2102 if (to_dealloc_jmeths != NULL) {
2103 FreeHeap(to_dealloc_jmeths);
2104 }
2105 // free up the new ID since it wasn't needed
2106 if (to_dealloc_id != NULL) {
2107 Method::destroy_jmethod_id(class_loader_data(), to_dealloc_id);
2108 }
2109 }
2110 return id;
2111 }
2112
2113 // Figure out how many jmethodIDs haven't been allocated, and make
2114 // sure space for them is pre-allocated. This makes getting all
2115 // method ids much, much faster with classes with more than 8
2116 // methods, and has a *substantial* effect on performance with jvmti
2117 // code that loads all jmethodIDs for all classes.
2118 void InstanceKlass::ensure_space_for_methodids(int start_offset) {
2119 int new_jmeths = 0;
2120 int length = methods()->length();
2121 for (int index = start_offset; index < length; index++) {
2122 Method* m = methods()->at(index);
2123 jmethodID id = m->find_jmethod_id_or_null();
2124 if (id == NULL) {
2125 new_jmeths++;
2126 }
2127 }
2128 if (new_jmeths != 0) {
2129 Method::ensure_jmethod_ids(class_loader_data(), new_jmeths);
2130 }
2131 }
2132
2133 // Common code to fetch the jmethodID from the cache or update the
2134 // cache with the new jmethodID. This function should never do anything
2135 // that causes the caller to go to a safepoint or we can deadlock with
2136 // the VMThread or have cache consistency issues.
2137 //
2138 jmethodID InstanceKlass::get_jmethod_id_fetch_or_update(
2139 size_t idnum, jmethodID new_id,
2140 jmethodID* new_jmeths, jmethodID* to_dealloc_id_p,
2141 jmethodID** to_dealloc_jmeths_p) {
2142 assert(new_id != NULL, "sanity check");
2143 assert(to_dealloc_id_p != NULL, "sanity check");
2144 assert(to_dealloc_jmeths_p != NULL, "sanity check");
2145 assert(Threads::number_of_threads() == 0 ||
2146 SafepointSynchronize::is_at_safepoint() ||
2147 JmethodIdCreation_lock->owned_by_self(), "sanity check");
2148
2149 // reacquire the cache - we are locked, single threaded or at a safepoint
2150 jmethodID* jmeths = methods_jmethod_ids_acquire();
2151 jmethodID id = NULL;
2152 size_t length = 0;
2153
2154 if (jmeths == NULL || // no cache yet
2155 (length = (size_t)jmeths[0]) <= idnum) { // cache is too short
2156 if (jmeths != NULL) {
2157 // copy any existing entries from the old cache
2158 for (size_t index = 0; index < length; index++) {
2159 new_jmeths[index+1] = jmeths[index+1];
2160 }
2161 *to_dealloc_jmeths_p = jmeths; // save old cache for later delete
2162 }
2163 release_set_methods_jmethod_ids(jmeths = new_jmeths);
2164 } else {
2165 // fetch jmethodID (if any) from the existing cache
2166 id = jmeths[idnum+1];
2167 *to_dealloc_jmeths_p = new_jmeths; // save new cache for later delete
2168 }
2169 if (id == NULL) {
2170 // No matching jmethodID in the existing cache or we have a new
2171 // cache or we just grew the cache. This cache write is done here
2172 // by the first thread to win the foot race because a jmethodID
2173 // needs to be unique once it is generally available.
2174 id = new_id;
2175
2176 // The jmethodID cache can be read while unlocked so we have to
2177 // make sure the new jmethodID is complete before installing it
2178 // in the cache.
2179 Atomic::release_store(&jmeths[idnum+1], id);
2180 } else {
2181 *to_dealloc_id_p = new_id; // save new id for later delete
2182 }
2183 return id;
2184 }
2185
2186
2187 // Common code to get the jmethodID cache length and the jmethodID
2188 // value at index idnum if there is one.
2189 //
2190 void InstanceKlass::get_jmethod_id_length_value(jmethodID* cache,
2191 size_t idnum, size_t *length_p, jmethodID* id_p) {
2192 assert(cache != NULL, "sanity check");
2193 assert(length_p != NULL, "sanity check");
2194 assert(id_p != NULL, "sanity check");
2195
2196 // cache size is stored in element[0], other elements offset by one
2197 *length_p = (size_t)cache[0];
2198 if (*length_p <= idnum) { // cache is too short
2199 *id_p = NULL;
2200 } else {
2201 *id_p = cache[idnum+1]; // fetch jmethodID (if any)
2202 }
2203 }
2204
2205
2206 // Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles
2207 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
2208 size_t idnum = (size_t)method->method_idnum();
2209 jmethodID* jmeths = methods_jmethod_ids_acquire();
2210 size_t length; // length assigned as debugging crumb
2211 jmethodID id = NULL;
2212 if (jmeths != NULL && // If there is a cache
2213 (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough,
2214 id = jmeths[idnum+1]; // Look up the id (may be NULL)
2215 }
2216 return id;
2217 }
2218
2219 inline DependencyContext InstanceKlass::dependencies() {
2220 DependencyContext dep_context(&_dep_context, &_dep_context_last_cleaned);
2221 return dep_context;
2222 }
2223
2224 int InstanceKlass::mark_dependent_nmethods(KlassDepChange& changes) {
2225 return dependencies().mark_dependent_nmethods(changes);
2226 }
2227
2228 void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
2229 dependencies().add_dependent_nmethod(nm);
2230 }
2231
2232 void InstanceKlass::remove_dependent_nmethod(nmethod* nm) {
2233 dependencies().remove_dependent_nmethod(nm);
2234 }
2235
2236 void InstanceKlass::clean_dependency_context() {
2237 dependencies().clean_unloading_dependents();
2238 }
2239
2240 #ifndef PRODUCT
2241 void InstanceKlass::print_dependent_nmethods(bool verbose) {
2242 dependencies().print_dependent_nmethods(verbose);
2243 }
2244
2245 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
2246 return dependencies().is_dependent_nmethod(nm);
2247 }
2248 #endif //PRODUCT
2249
2250 void InstanceKlass::clean_weak_instanceklass_links() {
2251 clean_implementors_list();
2252 clean_method_data();
2253 }
2254
2255 void InstanceKlass::clean_implementors_list() {
2256 assert(is_loader_alive(), "this klass should be live");
2257 if (is_interface()) {
2258 assert (ClassUnloading, "only called for ClassUnloading");
2259 for (;;) {
2260 // Use load_acquire due to competing with inserts
2261 Klass* impl = Atomic::load_acquire(adr_implementor());
2262 if (impl != NULL && !impl->is_loader_alive()) {
2263 // NULL this field, might be an unloaded klass or NULL
2264 Klass* volatile* klass = adr_implementor();
2265 if (Atomic::cmpxchg(klass, impl, (Klass*)NULL) == impl) {
2266 // Successfully unlinking implementor.
2267 if (log_is_enabled(Trace, class, unload)) {
2268 ResourceMark rm;
2269 log_trace(class, unload)("unlinking class (implementor): %s", impl->external_name());
2270 }
2271 return;
2272 }
2273 } else {
2274 return;
2275 }
2276 }
2277 }
2278 }
2279
2280 void InstanceKlass::clean_method_data() {
2281 for (int m = 0; m < methods()->length(); m++) {
2282 MethodData* mdo = methods()->at(m)->method_data();
2283 if (mdo != NULL) {
2284 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : mdo->extra_data_lock());
2285 mdo->clean_method_data(/*always_clean*/false);
2286 }
2287 }
2288 }
2289
2290 bool InstanceKlass::supers_have_passed_fingerprint_checks() {
2291 if (java_super() != NULL && !java_super()->has_passed_fingerprint_check()) {
2292 ResourceMark rm;
2293 log_trace(class, fingerprint)("%s : super %s not fingerprinted", external_name(), java_super()->external_name());
2294 return false;
2295 }
2296
2297 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
2298 if (local_interfaces != NULL) {
2299 int length = local_interfaces->length();
2300 for (int i = 0; i < length; i++) {
2301 InstanceKlass* intf = local_interfaces->at(i);
2302 if (!intf->has_passed_fingerprint_check()) {
2303 ResourceMark rm;
2304 log_trace(class, fingerprint)("%s : interface %s not fingerprinted", external_name(), intf->external_name());
2305 return false;
2306 }
2307 }
2308 }
2309
2310 return true;
2311 }
2312
2313 bool InstanceKlass::should_store_fingerprint(bool is_hidden_or_anonymous) {
2314 #if INCLUDE_AOT
2315 // We store the fingerprint into the InstanceKlass only in the following 2 cases:
2316 if (CalculateClassFingerprint) {
2317 // (1) We are running AOT to generate a shared library.
2318 return true;
2319 }
2320 if (Arguments::is_dumping_archive()) {
2321 // (2) We are running -Xshare:dump or -XX:ArchiveClassesAtExit to create a shared archive
2322 return true;
2323 }
2324 if (UseAOT && is_hidden_or_anonymous) {
2325 // (3) We are using AOT code from a shared library and see a hidden or unsafe anonymous class
2326 return true;
2327 }
2328 #endif
2329
2330 // In all other cases we might set the _misc_has_passed_fingerprint_check bit,
2331 // but do not store the 64-bit fingerprint to save space.
2332 return false;
2333 }
2334
2335 bool InstanceKlass::has_stored_fingerprint() const {
2336 #if INCLUDE_AOT
2337 return should_store_fingerprint() || is_shared();
2338 #else
2339 return false;
2340 #endif
2341 }
2342
2343 uint64_t InstanceKlass::get_stored_fingerprint() const {
2344 address adr = adr_fingerprint();
2345 if (adr != NULL) {
2346 return (uint64_t)Bytes::get_native_u8(adr); // adr may not be 64-bit aligned
2347 }
2348 return 0;
2349 }
2350
2351 void InstanceKlass::store_fingerprint(uint64_t fingerprint) {
2352 address adr = adr_fingerprint();
2353 if (adr != NULL) {
2354 Bytes::put_native_u8(adr, (u8)fingerprint); // adr may not be 64-bit aligned
2355
2356 ResourceMark rm;
2357 log_trace(class, fingerprint)("stored as " PTR64_FORMAT " for class %s", fingerprint, external_name());
2358 }
2359 }
2360
2361 void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) {
2362 Klass::metaspace_pointers_do(it);
2363
2364 if (log_is_enabled(Trace, cds)) {
2365 ResourceMark rm;
2366 log_trace(cds)("Iter(InstanceKlass): %p (%s)", this, external_name());
2367 }
2368
2369 it->push(&_annotations);
2370 it->push((Klass**)&_array_klasses);
2371 it->push(&_constants);
2372 it->push(&_inner_classes);
2373 it->push(&_array_name);
2374 #if INCLUDE_JVMTI
2375 it->push(&_previous_versions);
2376 #endif
2377 it->push(&_methods);
2378 it->push(&_default_methods);
2379 it->push(&_local_interfaces);
2380 it->push(&_transitive_interfaces);
2381 it->push(&_method_ordering);
2382 it->push(&_default_vtable_indices);
2383 it->push(&_fields);
2384
2385 if (itable_length() > 0) {
2386 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2387 int method_table_offset_in_words = ioe->offset()/wordSize;
2388 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
2389 / itableOffsetEntry::size();
2390
2391 for (int i = 0; i < nof_interfaces; i ++, ioe ++) {
2392 if (ioe->interface_klass() != NULL) {
2393 it->push(ioe->interface_klass_addr());
2394 itableMethodEntry* ime = ioe->first_method_entry(this);
2395 int n = klassItable::method_count_for_interface(ioe->interface_klass());
2396 for (int index = 0; index < n; index ++) {
2397 it->push(ime[index].method_addr());
2398 }
2399 }
2400 }
2401 }
2402
2403 it->push(&_nest_members);
2404 }
2405
2406 void InstanceKlass::remove_unshareable_info() {
2407 Klass::remove_unshareable_info();
2408
2409 if (is_in_error_state()) {
2410 // Classes are attempted to link during dumping and may fail,
2411 // but these classes are still in the dictionary and class list in CLD.
2412 // Check in_error state first because in_error is > linked state, so
2413 // is_linked() is true.
2414 // If there's a linking error, there is nothing else to remove.
2415 return;
2416 }
2417
2418 // Reset to the 'allocated' state to prevent any premature accessing to
2419 // a shared class at runtime while the class is still being loaded and
2420 // restored. A class' init_state is set to 'loaded' at runtime when it's
2421 // being added to class hierarchy (see SystemDictionary:::add_to_hierarchy()).
2422 _init_state = allocated;
2423
2424 { // Otherwise this needs to take out the Compile_lock.
2425 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
2426 init_implementor();
2427 }
2428
2429 constants()->remove_unshareable_info();
2430
2431 for (int i = 0; i < methods()->length(); i++) {
2432 Method* m = methods()->at(i);
2433 m->remove_unshareable_info();
2434 }
2435
2436 // do array classes also.
2437 if (array_klasses() != NULL) {
2438 array_klasses()->remove_unshareable_info();
2439 }
2440
2441 // These are not allocated from metaspace. They are safe to set to NULL.
2442 _source_debug_extension = NULL;
2443 _dep_context = NULL;
2444 _osr_nmethods_head = NULL;
2445 #if INCLUDE_JVMTI
2446 _breakpoints = NULL;
2447 _previous_versions = NULL;
2448 _cached_class_file = NULL;
2449 _jvmti_cached_class_field_map = NULL;
2450 #endif
2451
2452 _init_thread = NULL;
2453 _methods_jmethod_ids = NULL;
2454 _jni_ids = NULL;
2455 _oop_map_cache = NULL;
2456 // clear _nest_host to ensure re-load at runtime
2457 _nest_host = NULL;
2458 _package_entry = NULL;
2459 _dep_context_last_cleaned = 0;
2460 }
2461
2462 void InstanceKlass::remove_java_mirror() {
2463 Klass::remove_java_mirror();
2464
2465 // do array classes also.
2466 if (array_klasses() != NULL) {
2467 array_klasses()->remove_java_mirror();
2468 }
2469 }
2470
2471 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) {
2472 // SystemDictionary::add_to_hierarchy() sets the init_state to loaded
2473 // before the InstanceKlass is added to the SystemDictionary. Make
2474 // sure the current state is <loaded.
2475 assert(!is_loaded(), "invalid init state");
2476 set_package(loader_data, CHECK);
2477 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
2478
2479 Array<Method*>* methods = this->methods();
2480 int num_methods = methods->length();
2481 for (int index = 0; index < num_methods; ++index) {
2482 methods->at(index)->restore_unshareable_info(CHECK);
2483 }
2484 if (JvmtiExport::has_redefined_a_class()) {
2485 // Reinitialize vtable because RedefineClasses may have changed some
2486 // entries in this vtable for super classes so the CDS vtable might
2487 // point to old or obsolete entries. RedefineClasses doesn't fix up
2488 // vtables in the shared system dictionary, only the main one.
2489 // It also redefines the itable too so fix that too.
2490 vtable().initialize_vtable(false, CHECK);
2491 itable().initialize_itable(false, CHECK);
2492 }
2493
2494 // restore constant pool resolved references
2495 constants()->restore_unshareable_info(CHECK);
2496
2497 if (array_klasses() != NULL) {
2498 // Array classes have null protection domain.
2499 // --> see ArrayKlass::complete_create_array_klass()
2500 array_klasses()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
2501 }
2502
2503 // Initialize current biased locking state.
2504 if (UseBiasedLocking && BiasedLocking::enabled()) {
2505 set_prototype_header(markWord::biased_locking_prototype());
2506 }
2507 }
2508
2509 // returns true IFF is_in_error_state() has been changed as a result of this call.
2510 bool InstanceKlass::check_sharing_error_state() {
2511 assert(DumpSharedSpaces, "should only be called during dumping");
2512 bool old_state = is_in_error_state();
2513
2514 if (!is_in_error_state()) {
2515 bool bad = false;
2516 for (InstanceKlass* sup = java_super(); sup; sup = sup->java_super()) {
2517 if (sup->is_in_error_state()) {
2518 bad = true;
2519 break;
2520 }
2521 }
2522 if (!bad) {
2523 Array<InstanceKlass*>* interfaces = transitive_interfaces();
2524 for (int i = 0; i < interfaces->length(); i++) {
2525 InstanceKlass* iface = interfaces->at(i);
2526 if (iface->is_in_error_state()) {
2527 bad = true;
2528 break;
2529 }
2530 }
2531 }
2532
2533 if (bad) {
2534 set_in_error_state();
2535 }
2536 }
2537
2538 return (old_state != is_in_error_state());
2539 }
2540
2541 void InstanceKlass::set_class_loader_type(s2 loader_type) {
2542 switch (loader_type) {
2543 case ClassLoader::BOOT_LOADER:
2544 _misc_flags |= _misc_is_shared_boot_class;
2545 break;
2546 case ClassLoader::PLATFORM_LOADER:
2547 _misc_flags |= _misc_is_shared_platform_class;
2548 break;
2549 case ClassLoader::APP_LOADER:
2550 _misc_flags |= _misc_is_shared_app_class;
2551 break;
2552 default:
2553 ShouldNotReachHere();
2554 break;
2555 }
2556 }
2557
2558 #if INCLUDE_JVMTI
2559 static void clear_all_breakpoints(Method* m) {
2560 m->clear_all_breakpoints();
2561 }
2562 #endif
2563
2564 void InstanceKlass::unload_class(InstanceKlass* ik) {
2565 // Release dependencies.
2566 ik->dependencies().remove_all_dependents();
2567
2568 // notify the debugger
2569 if (JvmtiExport::should_post_class_unload()) {
2570 JvmtiExport::post_class_unload(ik);
2571 }
2572
2573 // notify ClassLoadingService of class unload
2574 ClassLoadingService::notify_class_unloaded(ik);
2575
2576 if (Arguments::is_dumping_archive()) {
2577 SystemDictionaryShared::remove_dumptime_info(ik);
2578 }
2579
2580 if (log_is_enabled(Info, class, unload)) {
2581 ResourceMark rm;
2582 log_info(class, unload)("unloading class %s " INTPTR_FORMAT, ik->external_name(), p2i(ik));
2583 }
2584
2585 Events::log_class_unloading(Thread::current(), ik);
2586
2587 #if INCLUDE_JFR
2588 assert(ik != NULL, "invariant");
2589 EventClassUnload event;
2590 event.set_unloadedClass(ik);
2591 event.set_definingClassLoader(ik->class_loader_data());
2592 event.commit();
2593 #endif
2594 }
2595
2596 static void method_release_C_heap_structures(Method* m) {
2597 m->release_C_heap_structures();
2598 }
2599
2600 void InstanceKlass::release_C_heap_structures(InstanceKlass* ik) {
2601 // Clean up C heap
2602 ik->release_C_heap_structures();
2603 ik->constants()->release_C_heap_structures();
2604
2605 // Deallocate and call destructors for MDO mutexes
2606 ik->methods_do(method_release_C_heap_structures);
2607
2608 }
2609
2610 void InstanceKlass::release_C_heap_structures() {
2611 // Can't release the constant pool here because the constant pool can be
2612 // deallocated separately from the InstanceKlass for default methods and
2613 // redefine classes.
2614
2615 // Deallocate oop map cache
2616 if (_oop_map_cache != NULL) {
2617 delete _oop_map_cache;
2618 _oop_map_cache = NULL;
2619 }
2620
2621 // Deallocate JNI identifiers for jfieldIDs
2622 JNIid::deallocate(jni_ids());
2623 set_jni_ids(NULL);
2624
2625 jmethodID* jmeths = methods_jmethod_ids_acquire();
2626 if (jmeths != (jmethodID*)NULL) {
2627 release_set_methods_jmethod_ids(NULL);
2628 FreeHeap(jmeths);
2629 }
2630
2631 assert(_dep_context == NULL,
2632 "dependencies should already be cleaned");
2633
2634 #if INCLUDE_JVMTI
2635 // Deallocate breakpoint records
2636 if (breakpoints() != 0x0) {
2637 methods_do(clear_all_breakpoints);
2638 assert(breakpoints() == 0x0, "should have cleared breakpoints");
2639 }
2640
2641 // deallocate the cached class file
2642 if (_cached_class_file != NULL) {
2643 os::free(_cached_class_file);
2644 _cached_class_file = NULL;
2645 }
2646 #endif
2647
2648 // Decrement symbol reference counts associated with the unloaded class.
2649 if (_name != NULL) _name->decrement_refcount();
2650
2651 // unreference array name derived from this class name (arrays of an unloaded
2652 // class can't be referenced anymore).
2653 if (_array_name != NULL) _array_name->decrement_refcount();
2654 FREE_C_HEAP_ARRAY(char, _source_debug_extension);
2655 }
2656
2657 void InstanceKlass::set_source_debug_extension(const char* array, int length) {
2658 if (array == NULL) {
2659 _source_debug_extension = NULL;
2660 } else {
2661 // Adding one to the attribute length in order to store a null terminator
2662 // character could cause an overflow because the attribute length is
2663 // already coded with an u4 in the classfile, but in practice, it's
2664 // unlikely to happen.
2665 assert((length+1) > length, "Overflow checking");
2666 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
2667 for (int i = 0; i < length; i++) {
2668 sde[i] = array[i];
2669 }
2670 sde[length] = '\0';
2671 _source_debug_extension = sde;
2672 }
2673 }
2674
2675 const char* InstanceKlass::signature_name() const {
2676 int hash_len = 0;
2677 char hash_buf[40];
2678
2679 // If this is an unsafe anonymous class, append a hash to make the name unique
2680 if (is_unsafe_anonymous()) {
2681 intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0;
2682 jio_snprintf(hash_buf, sizeof(hash_buf), "/" UINTX_FORMAT, (uintx)hash);
2683 hash_len = (int)strlen(hash_buf);
2684 }
2685
2686 // Get the internal name as a c string
2687 const char* src = (const char*) (name()->as_C_string());
2688 const int src_length = (int)strlen(src);
2689
2690 char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3);
2691
2692 // Add L as type indicator
2693 int dest_index = 0;
2694 dest[dest_index++] = JVM_SIGNATURE_CLASS;
2695
2696 // Add the actual class name
2697 for (int src_index = 0; src_index < src_length; ) {
2698 dest[dest_index++] = src[src_index++];
2699 }
2700
2701 // If we have a hash, append it
2702 for (int hash_index = 0; hash_index < hash_len; ) {
2703 dest[dest_index++] = hash_buf[hash_index++];
2704 }
2705
2706 // Add the semicolon and the NULL
2707 dest[dest_index++] = JVM_SIGNATURE_ENDCLASS;
2708 dest[dest_index] = '\0';
2709 return dest;
2710 }
2711
2712 // Used to obtain the package name from a fully qualified class name.
2713 Symbol* InstanceKlass::package_from_name(const Symbol* name, TRAPS) {
2714 if (name == NULL) {
2715 return NULL;
2716 } else {
2717 if (name->utf8_length() <= 0) {
2718 return NULL;
2719 }
2720 ResourceMark rm;
2721 const char* package_name = ClassLoader::package_from_name((const char*) name->as_C_string());
2722 if (package_name == NULL) {
2723 return NULL;
2724 }
2725 Symbol* pkg_name = SymbolTable::new_symbol(package_name);
2726 return pkg_name;
2727 }
2728 }
2729
2730 ModuleEntry* InstanceKlass::module() const {
2731 // For an unsafe anonymous class return the host class' module
2732 if (is_unsafe_anonymous()) {
2733 assert(unsafe_anonymous_host() != NULL, "unsafe anonymous class must have a host class");
2734 return unsafe_anonymous_host()->module();
2735 }
2736
2737 if (is_hidden() &&
2738 in_unnamed_package() &&
2739 class_loader_data()->is_shortlived()) {
2740 // For a weak hidden class defined to an unnamed package,
2741 // the short-lived CLD will not have an unnamed module created for it.
2742 // Two choices to find the correct ModuleEntry:
2743 // 1. If hidden class is within a nest, use nest host's module
2744 // 2. Find the unnamed module off from the class loader
2745 // For now option #2 is used since a nest host is not set until
2746 // after the instance class is created in jvm_lookup_define_class().
2747 if (class_loader_data()->is_boot_class_loader_data()) {
2748 return ClassLoaderData::the_null_class_loader_data()->unnamed_module();
2749 } else {
2750 oop module = java_lang_ClassLoader::unnamedModule(class_loader_data()->class_loader());
2751 assert(java_lang_Module::is_instance(module), "Not an instance of java.lang.Module");
2752 return java_lang_Module::module_entry(module);
2753 }
2754 }
2755
2756 // Class is in a named package
2757 if (!in_unnamed_package()) {
2758 return _package_entry->module();
2759 }
2760
2761 // Class is in an unnamed package, return its loader's unnamed module
2762 return class_loader_data()->unnamed_module();
2763 }
2764
2765 void InstanceKlass::set_package(ClassLoaderData* loader_data, TRAPS) {
2766
2767 // ensure java/ packages only loaded by boot or platform builtin loaders
2768 check_prohibited_package(name(), loader_data, CHECK);
2769
2770 TempNewSymbol pkg_name = package_from_name(name(), CHECK);
2771
2772 if (pkg_name != NULL && loader_data != NULL) {
2773
2774 // Find in class loader's package entry table.
2775 _package_entry = loader_data->packages()->lookup_only(pkg_name);
2776
2777 // If the package name is not found in the loader's package
2778 // entry table, it is an indication that the package has not
2779 // been defined. Consider it defined within the unnamed module.
2780 if (_package_entry == NULL) {
2781 ResourceMark rm;
2782
2783 if (!ModuleEntryTable::javabase_defined()) {
2784 // Before java.base is defined during bootstrapping, define all packages in
2785 // the java.base module. If a non-java.base package is erroneously placed
2786 // in the java.base module it will be caught later when java.base
2787 // is defined by ModuleEntryTable::verify_javabase_packages check.
2788 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, JAVA_BASE_NAME " module is NULL");
2789 _package_entry = loader_data->packages()->lookup(pkg_name, ModuleEntryTable::javabase_moduleEntry());
2790 } else {
2791 assert(loader_data->unnamed_module() != NULL, "unnamed module is NULL");
2792 _package_entry = loader_data->packages()->lookup(pkg_name,
2793 loader_data->unnamed_module());
2794 }
2795
2796 // A package should have been successfully created
2797 assert(_package_entry != NULL, "Package entry for class %s not found, loader %s",
2798 name()->as_C_string(), loader_data->loader_name_and_id());
2799 }
2800
2801 if (log_is_enabled(Debug, module)) {
2802 ResourceMark rm;
2803 ModuleEntry* m = _package_entry->module();
2804 log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s",
2805 external_name(),
2806 pkg_name->as_C_string(),
2807 loader_data->loader_name_and_id(),
2808 (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE));
2809 }
2810 } else {
2811 ResourceMark rm;
2812 log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s",
2813 external_name(),
2814 (loader_data != NULL) ? loader_data->loader_name_and_id() : "NULL",
2815 UNNAMED_MODULE);
2816 }
2817 }
2818
2819
2820 // different versions of is_same_class_package
2821
2822 bool InstanceKlass::is_same_class_package(const Klass* class2) const {
2823 oop classloader1 = this->class_loader();
2824 PackageEntry* classpkg1 = this->package();
2825 if (class2->is_objArray_klass()) {
2826 class2 = ObjArrayKlass::cast(class2)->bottom_klass();
2827 }
2828
2829 oop classloader2;
2830 PackageEntry* classpkg2;
2831 if (class2->is_instance_klass()) {
2832 classloader2 = class2->class_loader();
2833 classpkg2 = class2->package();
2834 } else {
2835 assert(class2->is_typeArray_klass(), "should be type array");
2836 classloader2 = NULL;
2837 classpkg2 = NULL;
2838 }
2839
2840 // Same package is determined by comparing class loader
2841 // and package entries. Both must be the same. This rule
2842 // applies even to classes that are defined in the unnamed
2843 // package, they still must have the same class loader.
2844 if ((classloader1 == classloader2) && (classpkg1 == classpkg2)) {
2845 return true;
2846 }
2847
2848 return false;
2849 }
2850
2851 // return true if this class and other_class are in the same package. Classloader
2852 // and classname information is enough to determine a class's package
2853 bool InstanceKlass::is_same_class_package(oop other_class_loader,
2854 const Symbol* other_class_name) const {
2855 if (class_loader() != other_class_loader) {
2856 return false;
2857 }
2858 if (name()->fast_compare(other_class_name) == 0) {
2859 return true;
2860 }
2861
2862 {
2863 ResourceMark rm;
2864
2865 bool bad_class_name = false;
2866 const char* other_pkg =
2867 ClassLoader::package_from_name((const char*) other_class_name->as_C_string(), &bad_class_name);
2868 if (bad_class_name) {
2869 return false;
2870 }
2871 // Check that package_from_name() returns NULL, not "", if there is no package.
2872 assert(other_pkg == NULL || strlen(other_pkg) > 0, "package name is empty string");
2873
2874 const Symbol* const this_package_name =
2875 this->package() != NULL ? this->package()->name() : NULL;
2876
2877 if (this_package_name == NULL || other_pkg == NULL) {
2878 // One of the two doesn't have a package. Only return true if the other
2879 // one also doesn't have a package.
2880 return (const char*)this_package_name == other_pkg;
2881 }
2882
2883 // Check if package is identical
2884 return this_package_name->equals(other_pkg);
2885 }
2886 }
2887
2888 // Returns true iff super_method can be overridden by a method in targetclassname
2889 // See JLS 3rd edition 8.4.6.1
2890 // Assumes name-signature match
2891 // "this" is InstanceKlass of super_method which must exist
2892 // note that the InstanceKlass of the method in the targetclassname has not always been created yet
2893 bool InstanceKlass::is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) {
2894 // Private methods can not be overridden
2895 if (super_method->is_private()) {
2896 return false;
2897 }
2898 // If super method is accessible, then override
2899 if ((super_method->is_protected()) ||
2900 (super_method->is_public())) {
2901 return true;
2902 }
2903 // Package-private methods are not inherited outside of package
2904 assert(super_method->is_package_private(), "must be package private");
2905 return(is_same_class_package(targetclassloader(), targetclassname));
2906 }
2907
2908 // Only boot and platform class loaders can define classes in "java/" packages.
2909 void InstanceKlass::check_prohibited_package(Symbol* class_name,
2910 ClassLoaderData* loader_data,
2911 TRAPS) {
2912 if (!loader_data->is_boot_class_loader_data() &&
2913 !loader_data->is_platform_class_loader_data() &&
2914 class_name != NULL) {
2915 ResourceMark rm(THREAD);
2916 char* name = class_name->as_C_string();
2917 if (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/') {
2918 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK);
2919 assert(pkg_name != NULL, "Error in parsing package name starting with 'java/'");
2920 name = pkg_name->as_C_string();
2921 const char* class_loader_name = loader_data->loader_name_and_id();
2922 StringUtils::replace_no_expand(name, "/", ".");
2923 const char* msg_text1 = "Class loader (instance of): ";
2924 const char* msg_text2 = " tried to load prohibited package name: ";
2925 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1;
2926 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
2927 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name);
2928 THROW_MSG(vmSymbols::java_lang_SecurityException(), message);
2929 }
2930 }
2931 return;
2932 }
2933
2934 bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const {
2935 constantPoolHandle i_cp(THREAD, constants());
2936 for (InnerClassesIterator iter(this); !iter.done(); iter.next()) {
2937 int ioff = iter.inner_class_info_index();
2938 if (ioff != 0) {
2939 // Check to see if the name matches the class we're looking for
2940 // before attempting to find the class.
2941 if (i_cp->klass_name_at_matches(this, ioff)) {
2942 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false);
2943 if (this == inner_klass) {
2944 *ooff = iter.outer_class_info_index();
2945 *noff = iter.inner_name_index();
2946 return true;
2947 }
2948 }
2949 }
2950 }
2951 return false;
2952 }
2953
2954 InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const {
2955 InstanceKlass* outer_klass = NULL;
2956 *inner_is_member = false;
2957 int ooff = 0, noff = 0;
2958 bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD);
2959 if (has_inner_classes_attr) {
2960 constantPoolHandle i_cp(THREAD, constants());
2961 if (ooff != 0) {
2962 Klass* ok = i_cp->klass_at(ooff, CHECK_NULL);
2963 outer_klass = InstanceKlass::cast(ok);
2964 *inner_is_member = true;
2965 }
2966 if (NULL == outer_klass) {
2967 // It may be a local or anonymous class; try for that.
2968 int encl_method_class_idx = enclosing_method_class_index();
2969 if (encl_method_class_idx != 0) {
2970 Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
2971 outer_klass = InstanceKlass::cast(ok);
2972 *inner_is_member = false;
2973 }
2974 }
2975 }
2976
2977 // If no inner class attribute found for this class.
2978 if (NULL == outer_klass) return NULL;
2979
2980 // Throws an exception if outer klass has not declared k as an inner klass
2981 // We need evidence that each klass knows about the other, or else
2982 // the system could allow a spoof of an inner class to gain access rights.
2983 Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL);
2984 return outer_klass;
2985 }
2986
2987 jint InstanceKlass::compute_modifier_flags(TRAPS) const {
2988 jint access = access_flags().as_int();
2989
2990 // But check if it happens to be member class.
2991 InnerClassesIterator iter(this);
2992 for (; !iter.done(); iter.next()) {
2993 int ioff = iter.inner_class_info_index();
2994 // Inner class attribute can be zero, skip it.
2995 // Strange but true: JVM spec. allows null inner class refs.
2996 if (ioff == 0) continue;
2997
2998 // only look at classes that are already loaded
2999 // since we are looking for the flags for our self.
3000 Symbol* inner_name = constants()->klass_name_at(ioff);
3001 if (name() == inner_name) {
3002 // This is really a member class.
3003 access = iter.inner_access_flags();
3004 break;
3005 }
3006 }
3007 // Remember to strip ACC_SUPER bit
3008 return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS;
3009 }
3010
3011 jint InstanceKlass::jvmti_class_status() const {
3012 jint result = 0;
3013
3014 if (is_linked()) {
3015 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
3016 }
3017
3018 if (is_initialized()) {
3019 assert(is_linked(), "Class status is not consistent");
3020 result |= JVMTI_CLASS_STATUS_INITIALIZED;
3021 }
3022 if (is_in_error_state()) {
3023 result |= JVMTI_CLASS_STATUS_ERROR;
3024 }
3025 return result;
3026 }
3027
3028 Method* InstanceKlass::method_at_itable(Klass* holder, int index, TRAPS) {
3029 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
3030 int method_table_offset_in_words = ioe->offset()/wordSize;
3031 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
3032 / itableOffsetEntry::size();
3033
3034 for (int cnt = 0 ; ; cnt ++, ioe ++) {
3035 // If the interface isn't implemented by the receiver class,
3036 // the VM should throw IncompatibleClassChangeError.
3037 if (cnt >= nof_interfaces) {
3038 ResourceMark rm(THREAD);
3039 stringStream ss;
3040 bool same_module = (module() == holder->module());
3041 ss.print("Receiver class %s does not implement "
3042 "the interface %s defining the method to be called "
3043 "(%s%s%s)",
3044 external_name(), holder->external_name(),
3045 (same_module) ? joint_in_module_of_loader(holder) : class_in_module_of_loader(),
3046 (same_module) ? "" : "; ",
3047 (same_module) ? "" : holder->class_in_module_of_loader());
3048 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
3049 }
3050
3051 Klass* ik = ioe->interface_klass();
3052 if (ik == holder) break;
3053 }
3054
3055 itableMethodEntry* ime = ioe->first_method_entry(this);
3056 Method* m = ime[index].method();
3057 if (m == NULL) {
3058 THROW_NULL(vmSymbols::java_lang_AbstractMethodError());
3059 }
3060 return m;
3061 }
3062
3063
3064 #if INCLUDE_JVMTI
3065 // update default_methods for redefineclasses for methods that are
3066 // not yet in the vtable due to concurrent subclass define and superinterface
3067 // redefinition
3068 // Note: those in the vtable, should have been updated via adjust_method_entries
3069 void InstanceKlass::adjust_default_methods(bool* trace_name_printed) {
3070 // search the default_methods for uses of either obsolete or EMCP methods
3071 if (default_methods() != NULL) {
3072 for (int index = 0; index < default_methods()->length(); index ++) {
3073 Method* old_method = default_methods()->at(index);
3074 if (old_method == NULL || !old_method->is_old()) {
3075 continue; // skip uninteresting entries
3076 }
3077 assert(!old_method->is_deleted(), "default methods may not be deleted");
3078 Method* new_method = old_method->get_new_method();
3079 default_methods()->at_put(index, new_method);
3080
3081 if (log_is_enabled(Info, redefine, class, update)) {
3082 ResourceMark rm;
3083 if (!(*trace_name_printed)) {
3084 log_info(redefine, class, update)
3085 ("adjust: klassname=%s default methods from name=%s",
3086 external_name(), old_method->method_holder()->external_name());
3087 *trace_name_printed = true;
3088 }
3089 log_debug(redefine, class, update, vtables)
3090 ("default method update: %s(%s) ",
3091 new_method->name()->as_C_string(), new_method->signature()->as_C_string());
3092 }
3093 }
3094 }
3095 }
3096 #endif // INCLUDE_JVMTI
3097
3098 // On-stack replacement stuff
3099 void InstanceKlass::add_osr_nmethod(nmethod* n) {
3100 assert_lock_strong(CompiledMethod_lock);
3101 #ifndef PRODUCT
3102 if (TieredCompilation) {
3103 nmethod * prev = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), n->comp_level(), true);
3104 assert(prev == NULL || !prev->is_in_use(),
3105 "redundunt OSR recompilation detected. memory leak in CodeCache!");
3106 }
3107 #endif
3108 // only one compilation can be active
3109 {
3110 assert(n->is_osr_method(), "wrong kind of nmethod");
3111 n->set_osr_link(osr_nmethods_head());
3112 set_osr_nmethods_head(n);
3113 // Raise the highest osr level if necessary
3114 if (TieredCompilation) {
3115 Method* m = n->method();
3116 m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level()));
3117 }
3118 }
3119
3120 // Get rid of the osr methods for the same bci that have lower levels.
3121 if (TieredCompilation) {
3122 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) {
3123 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true);
3124 if (inv != NULL && inv->is_in_use()) {
3125 inv->make_not_entrant();
3126 }
3127 }
3128 }
3129 }
3130
3131 // Remove osr nmethod from the list. Return true if found and removed.
3132 bool InstanceKlass::remove_osr_nmethod(nmethod* n) {
3133 // This is a short non-blocking critical region, so the no safepoint check is ok.
3134 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock
3135 , Mutex::_no_safepoint_check_flag);
3136 assert(n->is_osr_method(), "wrong kind of nmethod");
3137 nmethod* last = NULL;
3138 nmethod* cur = osr_nmethods_head();
3139 int max_level = CompLevel_none; // Find the max comp level excluding n
3140 Method* m = n->method();
3141 // Search for match
3142 bool found = false;
3143 while(cur != NULL && cur != n) {
3144 if (TieredCompilation && m == cur->method()) {
3145 // Find max level before n
3146 max_level = MAX2(max_level, cur->comp_level());
3147 }
3148 last = cur;
3149 cur = cur->osr_link();
3150 }
3151 nmethod* next = NULL;
3152 if (cur == n) {
3153 found = true;
3154 next = cur->osr_link();
3155 if (last == NULL) {
3156 // Remove first element
3157 set_osr_nmethods_head(next);
3158 } else {
3159 last->set_osr_link(next);
3160 }
3161 }
3162 n->set_osr_link(NULL);
3163 if (TieredCompilation) {
3164 cur = next;
3165 while (cur != NULL) {
3166 // Find max level after n
3167 if (m == cur->method()) {
3168 max_level = MAX2(max_level, cur->comp_level());
3169 }
3170 cur = cur->osr_link();
3171 }
3172 m->set_highest_osr_comp_level(max_level);
3173 }
3174 return found;
3175 }
3176
3177 int InstanceKlass::mark_osr_nmethods(const Method* m) {
3178 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock,
3179 Mutex::_no_safepoint_check_flag);
3180 nmethod* osr = osr_nmethods_head();
3181 int found = 0;
3182 while (osr != NULL) {
3183 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3184 if (osr->method() == m) {
3185 osr->mark_for_deoptimization();
3186 found++;
3187 }
3188 osr = osr->osr_link();
3189 }
3190 return found;
3191 }
3192
3193 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
3194 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock,
3195 Mutex::_no_safepoint_check_flag);
3196 nmethod* osr = osr_nmethods_head();
3197 nmethod* best = NULL;
3198 while (osr != NULL) {
3199 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3200 // There can be a time when a c1 osr method exists but we are waiting
3201 // for a c2 version. When c2 completes its osr nmethod we will trash
3202 // the c1 version and only be able to find the c2 version. However
3203 // while we overflow in the c1 code at back branches we don't want to
3204 // try and switch to the same code as we are already running
3205
3206 if (osr->method() == m &&
3207 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
3208 if (match_level) {
3209 if (osr->comp_level() == comp_level) {
3210 // Found a match - return it.
3211 return osr;
3212 }
3213 } else {
3214 if (best == NULL || (osr->comp_level() > best->comp_level())) {
3215 if (osr->comp_level() == CompLevel_highest_tier) {
3216 // Found the best possible - return it.
3217 return osr;
3218 }
3219 best = osr;
3220 }
3221 }
3222 }
3223 osr = osr->osr_link();
3224 }
3225
3226 assert(match_level == false || best == NULL, "shouldn't pick up anything if match_level is set");
3227 if (best != NULL && best->comp_level() >= comp_level) {
3228 return best;
3229 }
3230 return NULL;
3231 }
3232
3233 // -----------------------------------------------------------------------------------------------------
3234 // Printing
3235
3236 #ifndef PRODUCT
3237
3238 #define BULLET " - "
3239
3240 static const char* state_names[] = {
3241 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
3242 };
3243
3244 static void print_vtable(intptr_t* start, int len, outputStream* st) {
3245 for (int i = 0; i < len; i++) {
3246 intptr_t e = start[i];
3247 st->print("%d : " INTPTR_FORMAT, i, e);
3248 if (MetaspaceObj::is_valid((Metadata*)e)) {
3249 st->print(" ");
3250 ((Metadata*)e)->print_value_on(st);
3251 }
3252 st->cr();
3253 }
3254 }
3255
3256 static void print_vtable(vtableEntry* start, int len, outputStream* st) {
3257 return print_vtable(reinterpret_cast<intptr_t*>(start), len, st);
3258 }
3259
3260 void InstanceKlass::print_on(outputStream* st) const {
3261 assert(is_klass(), "must be klass");
3262 Klass::print_on(st);
3263
3264 st->print(BULLET"instance size: %d", size_helper()); st->cr();
3265 st->print(BULLET"klass size: %d", size()); st->cr();
3266 st->print(BULLET"access: "); access_flags().print_on(st); st->cr();
3267 st->print(BULLET"state: "); st->print_cr("%s", state_names[_init_state]);
3268 st->print(BULLET"name: "); name()->print_value_on(st); st->cr();
3269 st->print(BULLET"super: "); Metadata::print_value_on_maybe_null(st, super()); st->cr();
3270 st->print(BULLET"sub: ");
3271 Klass* sub = subklass();
3272 int n;
3273 for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) {
3274 if (n < MaxSubklassPrintSize) {
3275 sub->print_value_on(st);
3276 st->print(" ");
3277 }
3278 }
3279 if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize);
3280 st->cr();
3281
3282 if (is_interface()) {
3283 st->print_cr(BULLET"nof implementors: %d", nof_implementors());
3284 if (nof_implementors() == 1) {
3285 st->print_cr(BULLET"implementor: ");
3286 st->print(" ");
3287 implementor()->print_value_on(st);
3288 st->cr();
3289 }
3290 }
3291
3292 st->print(BULLET"arrays: "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr();
3293 st->print(BULLET"methods: "); methods()->print_value_on(st); st->cr();
3294 if (Verbose || WizardMode) {
3295 Array<Method*>* method_array = methods();
3296 for (int i = 0; i < method_array->length(); i++) {
3297 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3298 }
3299 }
3300 st->print(BULLET"method ordering: "); method_ordering()->print_value_on(st); st->cr();
3301 st->print(BULLET"default_methods: "); default_methods()->print_value_on(st); st->cr();
3302 if (Verbose && default_methods() != NULL) {
3303 Array<Method*>* method_array = default_methods();
3304 for (int i = 0; i < method_array->length(); i++) {
3305 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3306 }
3307 }
3308 if (default_vtable_indices() != NULL) {
3309 st->print(BULLET"default vtable indices: "); default_vtable_indices()->print_value_on(st); st->cr();
3310 }
3311 st->print(BULLET"local interfaces: "); local_interfaces()->print_value_on(st); st->cr();
3312 st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr();
3313 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr();
3314 if (class_loader_data() != NULL) {
3315 st->print(BULLET"class loader data: ");
3316 class_loader_data()->print_value_on(st);
3317 st->cr();
3318 }
3319 st->print(BULLET"unsafe anonymous host class: "); Metadata::print_value_on_maybe_null(st, unsafe_anonymous_host()); st->cr();
3320 if (source_file_name() != NULL) {
3321 st->print(BULLET"source file: ");
3322 source_file_name()->print_value_on(st);
3323 st->cr();
3324 }
3325 if (source_debug_extension() != NULL) {
3326 st->print(BULLET"source debug extension: ");
3327 st->print("%s", source_debug_extension());
3328 st->cr();
3329 }
3330 st->print(BULLET"class annotations: "); class_annotations()->print_value_on(st); st->cr();
3331 st->print(BULLET"class type annotations: "); class_type_annotations()->print_value_on(st); st->cr();
3332 st->print(BULLET"field annotations: "); fields_annotations()->print_value_on(st); st->cr();
3333 st->print(BULLET"field type annotations: "); fields_type_annotations()->print_value_on(st); st->cr();
3334 {
3335 bool have_pv = false;
3336 // previous versions are linked together through the InstanceKlass
3337 for (InstanceKlass* pv_node = previous_versions();
3338 pv_node != NULL;
3339 pv_node = pv_node->previous_versions()) {
3340 if (!have_pv)
3341 st->print(BULLET"previous version: ");
3342 have_pv = true;
3343 pv_node->constants()->print_value_on(st);
3344 }
3345 if (have_pv) st->cr();
3346 }
3347
3348 if (generic_signature() != NULL) {
3349 st->print(BULLET"generic signature: ");
3350 generic_signature()->print_value_on(st);
3351 st->cr();
3352 }
3353 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr();
3354 st->print(BULLET"nest members: "); nest_members()->print_value_on(st); st->cr();
3355 if (java_mirror() != NULL) {
3356 st->print(BULLET"java mirror: ");
3357 java_mirror()->print_value_on(st);
3358 st->cr();
3359 } else {
3360 st->print_cr(BULLET"java mirror: NULL");
3361 }
3362 st->print(BULLET"vtable length %d (start addr: " INTPTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
3363 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st);
3364 st->print(BULLET"itable length %d (start addr: " INTPTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
3365 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_itable(), itable_length(), st);
3366 st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
3367 FieldPrinter print_static_field(st);
3368 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
3369 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
3370 FieldPrinter print_nonstatic_field(st);
3371 InstanceKlass* ik = const_cast<InstanceKlass*>(this);
3372 ik->do_nonstatic_fields(&print_nonstatic_field);
3373
3374 st->print(BULLET"non-static oop maps: ");
3375 OopMapBlock* map = start_of_nonstatic_oop_maps();
3376 OopMapBlock* end_map = map + nonstatic_oop_map_count();
3377 while (map < end_map) {
3378 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
3379 map++;
3380 }
3381 st->cr();
3382 }
3383
3384 #endif //PRODUCT
3385
3386 void InstanceKlass::print_value_on(outputStream* st) const {
3387 assert(is_klass(), "must be klass");
3388 if (Verbose || WizardMode) access_flags().print_on(st);
3389 name()->print_value_on(st);
3390 }
3391
3392 #ifndef PRODUCT
3393
3394 void FieldPrinter::do_field(fieldDescriptor* fd) {
3395 _st->print(BULLET);
3396 if (_obj == NULL) {
3397 fd->print_on(_st);
3398 _st->cr();
3399 } else {
3400 fd->print_on_for(_st, _obj);
3401 _st->cr();
3402 }
3403 }
3404
3405
3406 void InstanceKlass::oop_print_on(oop obj, outputStream* st) {
3407 Klass::oop_print_on(obj, st);
3408
3409 if (this == SystemDictionary::String_klass()) {
3410 typeArrayOop value = java_lang_String::value(obj);
3411 juint length = java_lang_String::length(obj);
3412 if (value != NULL &&
3413 value->is_typeArray() &&
3414 length <= (juint) value->length()) {
3415 st->print(BULLET"string: ");
3416 java_lang_String::print(obj, st);
3417 st->cr();
3418 if (!WizardMode) return; // that is enough
3419 }
3420 }
3421
3422 st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj));
3423 FieldPrinter print_field(st, obj);
3424 do_nonstatic_fields(&print_field);
3425
3426 if (this == SystemDictionary::Class_klass()) {
3427 st->print(BULLET"signature: ");
3428 java_lang_Class::print_signature(obj, st);
3429 st->cr();
3430 Klass* mirrored_klass = java_lang_Class::as_Klass(obj);
3431 st->print(BULLET"fake entry for mirror: ");
3432 Metadata::print_value_on_maybe_null(st, mirrored_klass);
3433 st->cr();
3434 Klass* array_klass = java_lang_Class::array_klass_acquire(obj);
3435 st->print(BULLET"fake entry for array: ");
3436 Metadata::print_value_on_maybe_null(st, array_klass);
3437 st->cr();
3438 st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj));
3439 st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj));
3440 Klass* real_klass = java_lang_Class::as_Klass(obj);
3441 if (real_klass != NULL && real_klass->is_instance_klass()) {
3442 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
3443 }
3444 } else if (this == SystemDictionary::MethodType_klass()) {
3445 st->print(BULLET"signature: ");
3446 java_lang_invoke_MethodType::print_signature(obj, st);
3447 st->cr();
3448 }
3449 }
3450
3451 bool InstanceKlass::verify_itable_index(int i) {
3452 int method_count = klassItable::method_count_for_interface(this);
3453 assert(i >= 0 && i < method_count, "index out of bounds");
3454 return true;
3455 }
3456
3457 #endif //PRODUCT
3458
3459 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
3460 st->print("a ");
3461 name()->print_value_on(st);
3462 obj->print_address_on(st);
3463 if (this == SystemDictionary::String_klass()
3464 && java_lang_String::value(obj) != NULL) {
3465 ResourceMark rm;
3466 int len = java_lang_String::length(obj);
3467 int plen = (len < 24 ? len : 12);
3468 char* str = java_lang_String::as_utf8_string(obj, 0, plen);
3469 st->print(" = \"%s\"", str);
3470 if (len > plen)
3471 st->print("...[%d]", len);
3472 } else if (this == SystemDictionary::Class_klass()) {
3473 Klass* k = java_lang_Class::as_Klass(obj);
3474 st->print(" = ");
3475 if (k != NULL) {
3476 k->print_value_on(st);
3477 } else {
3478 const char* tname = type2name(java_lang_Class::primitive_type(obj));
3479 st->print("%s", tname ? tname : "type?");
3480 }
3481 } else if (this == SystemDictionary::MethodType_klass()) {
3482 st->print(" = ");
3483 java_lang_invoke_MethodType::print_signature(obj, st);
3484 } else if (java_lang_boxing_object::is_instance(obj)) {
3485 st->print(" = ");
3486 java_lang_boxing_object::print(obj, st);
3487 } else if (this == SystemDictionary::LambdaForm_klass()) {
3488 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
3489 if (vmentry != NULL) {
3490 st->print(" => ");
3491 vmentry->print_value_on(st);
3492 }
3493 } else if (this == SystemDictionary::MemberName_klass()) {
3494 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
3495 if (vmtarget != NULL) {
3496 st->print(" = ");
3497 vmtarget->print_value_on(st);
3498 } else {
3499 java_lang_invoke_MemberName::clazz(obj)->print_value_on(st);
3500 st->print(".");
3501 java_lang_invoke_MemberName::name(obj)->print_value_on(st);
3502 }
3503 }
3504 }
3505
3506 const char* InstanceKlass::internal_name() const {
3507 return external_name();
3508 }
3509
3510 void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data,
3511 const char* module_name,
3512 const ClassFileStream* cfs) const {
3513 if (!log_is_enabled(Info, class, load)) {
3514 return;
3515 }
3516
3517 ResourceMark rm;
3518 LogMessage(class, load) msg;
3519 stringStream info_stream;
3520
3521 // Name and class hierarchy info
3522 info_stream.print("%s", external_name());
3523
3524 // Source
3525 if (cfs != NULL) {
3526 if (cfs->source() != NULL) {
3527 if (module_name != NULL) {
3528 // When the boot loader created the stream, it didn't know the module name
3529 // yet. Let's format it now.
3530 if (cfs->from_boot_loader_modules_image()) {
3531 info_stream.print(" source: jrt:/%s", module_name);
3532 } else {
3533 info_stream.print(" source: %s", cfs->source());
3534 }
3535 } else {
3536 info_stream.print(" source: %s", cfs->source());
3537 }
3538 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) {
3539 Thread* THREAD = Thread::current();
3540 Klass* caller =
3541 THREAD->is_Java_thread()
3542 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
3543 : NULL;
3544 // caller can be NULL, for example, during a JVMTI VM_Init hook
3545 if (caller != NULL) {
3546 info_stream.print(" source: instance of %s", caller->external_name());
3547 } else {
3548 // source is unknown
3549 }
3550 } else {
3551 oop class_loader = loader_data->class_loader();
3552 info_stream.print(" source: %s", class_loader->klass()->external_name());
3553 }
3554 } else {
3555 assert(this->is_shared(), "must be");
3556 if (MetaspaceShared::is_shared_dynamic((void*)this)) {
3557 info_stream.print(" source: shared objects file (top)");
3558 } else {
3559 info_stream.print(" source: shared objects file");
3560 }
3561 }
3562
3563 msg.info("%s", info_stream.as_string());
3564
3565 if (log_is_enabled(Debug, class, load)) {
3566 stringStream debug_stream;
3567
3568 // Class hierarchy info
3569 debug_stream.print(" klass: " INTPTR_FORMAT " super: " INTPTR_FORMAT,
3570 p2i(this), p2i(superklass()));
3571
3572 // Interfaces
3573 if (local_interfaces() != NULL && local_interfaces()->length() > 0) {
3574 debug_stream.print(" interfaces:");
3575 int length = local_interfaces()->length();
3576 for (int i = 0; i < length; i++) {
3577 debug_stream.print(" " INTPTR_FORMAT,
3578 p2i(InstanceKlass::cast(local_interfaces()->at(i))));
3579 }
3580 }
3581
3582 // Class loader
3583 debug_stream.print(" loader: [");
3584 loader_data->print_value_on(&debug_stream);
3585 debug_stream.print("]");
3586
3587 // Classfile checksum
3588 if (cfs) {
3589 debug_stream.print(" bytes: %d checksum: %08x",
3590 cfs->length(),
3591 ClassLoader::crc32(0, (const char*)cfs->buffer(),
3592 cfs->length()));
3593 }
3594
3595 msg.debug("%s", debug_stream.as_string());
3596 }
3597 }
3598
3599 #if INCLUDE_SERVICES
3600 // Size Statistics
3601 void InstanceKlass::collect_statistics(KlassSizeStats *sz) const {
3602 Klass::collect_statistics(sz);
3603
3604 sz->_inst_size = wordSize * size_helper();
3605 sz->_vtab_bytes = wordSize * vtable_length();
3606 sz->_itab_bytes = wordSize * itable_length();
3607 sz->_nonstatic_oopmap_bytes = wordSize * nonstatic_oop_map_size();
3608
3609 int n = 0;
3610 n += (sz->_methods_array_bytes = sz->count_array(methods()));
3611 n += (sz->_method_ordering_bytes = sz->count_array(method_ordering()));
3612 n += (sz->_local_interfaces_bytes = sz->count_array(local_interfaces()));
3613 n += (sz->_transitive_interfaces_bytes = sz->count_array(transitive_interfaces()));
3614 n += (sz->_fields_bytes = sz->count_array(fields()));
3615 n += (sz->_inner_classes_bytes = sz->count_array(inner_classes()));
3616 n += (sz->_nest_members_bytes = sz->count_array(nest_members()));
3617 sz->_ro_bytes += n;
3618
3619 const ConstantPool* cp = constants();
3620 if (cp) {
3621 cp->collect_statistics(sz);
3622 }
3623
3624 const Annotations* anno = annotations();
3625 if (anno) {
3626 anno->collect_statistics(sz);
3627 }
3628
3629 const Array<Method*>* methods_array = methods();
3630 if (methods()) {
3631 for (int i = 0; i < methods_array->length(); i++) {
3632 Method* method = methods_array->at(i);
3633 if (method) {
3634 sz->_method_count ++;
3635 method->collect_statistics(sz);
3636 }
3637 }
3638 }
3639 }
3640 #endif // INCLUDE_SERVICES
3641
3642 // Verification
3643
3644 class VerifyFieldClosure: public BasicOopIterateClosure {
3645 protected:
3646 template <class T> void do_oop_work(T* p) {
3647 oop obj = RawAccess<>::oop_load(p);
3648 if (!oopDesc::is_oop_or_null(obj)) {
3649 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj));
3650 Universe::print_on(tty);
3651 guarantee(false, "boom");
3652 }
3653 }
3654 public:
3655 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); }
3656 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
3657 };
3658
3659 void InstanceKlass::verify_on(outputStream* st) {
3660 #ifndef PRODUCT
3661 // Avoid redundant verifies, this really should be in product.
3662 if (_verify_count == Universe::verify_count()) return;
3663 _verify_count = Universe::verify_count();
3664 #endif
3665
3666 // Verify Klass
3667 Klass::verify_on(st);
3668
3669 // Verify that klass is present in ClassLoaderData
3670 guarantee(class_loader_data()->contains_klass(this),
3671 "this class isn't found in class loader data");
3672
3673 // Verify vtables
3674 if (is_linked()) {
3675 // $$$ This used to be done only for m/s collections. Doing it
3676 // always seemed a valid generalization. (DLD -- 6/00)
3677 vtable().verify(st);
3678 }
3679
3680 // Verify first subklass
3681 if (subklass() != NULL) {
3682 guarantee(subklass()->is_klass(), "should be klass");
3683 }
3684
3685 // Verify siblings
3686 Klass* super = this->super();
3687 Klass* sib = next_sibling();
3688 if (sib != NULL) {
3689 if (sib == this) {
3690 fatal("subclass points to itself " PTR_FORMAT, p2i(sib));
3691 }
3692
3693 guarantee(sib->is_klass(), "should be klass");
3694 guarantee(sib->super() == super, "siblings should have same superklass");
3695 }
3696
3697 // Verify local interfaces
3698 if (local_interfaces()) {
3699 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
3700 for (int j = 0; j < local_interfaces->length(); j++) {
3701 InstanceKlass* e = local_interfaces->at(j);
3702 guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
3703 }
3704 }
3705
3706 // Verify transitive interfaces
3707 if (transitive_interfaces() != NULL) {
3708 Array<InstanceKlass*>* transitive_interfaces = this->transitive_interfaces();
3709 for (int j = 0; j < transitive_interfaces->length(); j++) {
3710 InstanceKlass* e = transitive_interfaces->at(j);
3711 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
3712 }
3713 }
3714
3715 // Verify methods
3716 if (methods() != NULL) {
3717 Array<Method*>* methods = this->methods();
3718 for (int j = 0; j < methods->length(); j++) {
3719 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3720 }
3721 for (int j = 0; j < methods->length() - 1; j++) {
3722 Method* m1 = methods->at(j);
3723 Method* m2 = methods->at(j + 1);
3724 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3725 }
3726 }
3727
3728 // Verify method ordering
3729 if (method_ordering() != NULL) {
3730 Array<int>* method_ordering = this->method_ordering();
3731 int length = method_ordering->length();
3732 if (JvmtiExport::can_maintain_original_method_order() ||
3733 ((UseSharedSpaces || Arguments::is_dumping_archive()) && length != 0)) {
3734 guarantee(length == methods()->length(), "invalid method ordering length");
3735 jlong sum = 0;
3736 for (int j = 0; j < length; j++) {
3737 int original_index = method_ordering->at(j);
3738 guarantee(original_index >= 0, "invalid method ordering index");
3739 guarantee(original_index < length, "invalid method ordering index");
3740 sum += original_index;
3741 }
3742 // Verify sum of indices 0,1,...,length-1
3743 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
3744 } else {
3745 guarantee(length == 0, "invalid method ordering length");
3746 }
3747 }
3748
3749 // Verify default methods
3750 if (default_methods() != NULL) {
3751 Array<Method*>* methods = this->default_methods();
3752 for (int j = 0; j < methods->length(); j++) {
3753 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3754 }
3755 for (int j = 0; j < methods->length() - 1; j++) {
3756 Method* m1 = methods->at(j);
3757 Method* m2 = methods->at(j + 1);
3758 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3759 }
3760 }
3761
3762 // Verify JNI static field identifiers
3763 if (jni_ids() != NULL) {
3764 jni_ids()->verify(this);
3765 }
3766
3767 // Verify other fields
3768 if (array_klasses() != NULL) {
3769 guarantee(array_klasses()->is_klass(), "should be klass");
3770 }
3771 if (constants() != NULL) {
3772 guarantee(constants()->is_constantPool(), "should be constant pool");
3773 }
3774 const Klass* anonymous_host = unsafe_anonymous_host();
3775 if (anonymous_host != NULL) {
3776 guarantee(anonymous_host->is_klass(), "should be klass");
3777 }
3778 }
3779
3780 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
3781 Klass::oop_verify_on(obj, st);
3782 VerifyFieldClosure blk;
3783 obj->oop_iterate(&blk);
3784 }
3785
3786
3787 // JNIid class for jfieldIDs only
3788 // Note to reviewers:
3789 // These JNI functions are just moved over to column 1 and not changed
3790 // in the compressed oops workspace.
3791 JNIid::JNIid(Klass* holder, int offset, JNIid* next) {
3792 _holder = holder;
3793 _offset = offset;
3794 _next = next;
3795 debug_only(_is_static_field_id = false;)
3796 }
3797
3798
3799 JNIid* JNIid::find(int offset) {
3800 JNIid* current = this;
3801 while (current != NULL) {
3802 if (current->offset() == offset) return current;
3803 current = current->next();
3804 }
3805 return NULL;
3806 }
3807
3808 void JNIid::deallocate(JNIid* current) {
3809 while (current != NULL) {
3810 JNIid* next = current->next();
3811 delete current;
3812 current = next;
3813 }
3814 }
3815
3816
3817 void JNIid::verify(Klass* holder) {
3818 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields();
3819 int end_field_offset;
3820 end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize);
3821
3822 JNIid* current = this;
3823 while (current != NULL) {
3824 guarantee(current->holder() == holder, "Invalid klass in JNIid");
3825 #ifdef ASSERT
3826 int o = current->offset();
3827 if (current->is_static_field_id()) {
3828 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid");
3829 }
3830 #endif
3831 current = current->next();
3832 }
3833 }
3834
3835 void InstanceKlass::set_init_state(ClassState state) {
3836 #ifdef ASSERT
3837 bool good_state = is_shared() ? (_init_state <= state)
3838 : (_init_state < state);
3839 assert(good_state || state == allocated, "illegal state transition");
3840 #endif
3841 assert(_init_thread == NULL, "should be cleared before state change");
3842 _init_state = (u1)state;
3843 }
3844
3845 #if INCLUDE_JVMTI
3846
3847 // RedefineClasses() support for previous versions
3848
3849 // Globally, there is at least one previous version of a class to walk
3850 // during class unloading, which is saved because old methods in the class
3851 // are still running. Otherwise the previous version list is cleaned up.
3852 bool InstanceKlass::_has_previous_versions = false;
3853
3854 // Returns true if there are previous versions of a class for class
3855 // unloading only. Also resets the flag to false. purge_previous_version
3856 // will set the flag to true if there are any left, i.e., if there's any
3857 // work to do for next time. This is to avoid the expensive code cache
3858 // walk in CLDG::clean_deallocate_lists().
3859 bool InstanceKlass::has_previous_versions_and_reset() {
3860 bool ret = _has_previous_versions;
3861 log_trace(redefine, class, iklass, purge)("Class unloading: has_previous_versions = %s",
3862 ret ? "true" : "false");
3863 _has_previous_versions = false;
3864 return ret;
3865 }
3866
3867 // Purge previous versions before adding new previous versions of the class and
3868 // during class unloading.
3869 void InstanceKlass::purge_previous_version_list() {
3870 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
3871 assert(has_been_redefined(), "Should only be called for main class");
3872
3873 // Quick exit.
3874 if (previous_versions() == NULL) {
3875 return;
3876 }
3877
3878 // This klass has previous versions so see what we can cleanup
3879 // while it is safe to do so.
3880
3881 int deleted_count = 0; // leave debugging breadcrumbs
3882 int live_count = 0;
3883 ClassLoaderData* loader_data = class_loader_data();
3884 assert(loader_data != NULL, "should never be null");
3885
3886 ResourceMark rm;
3887 log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name());
3888
3889 // previous versions are linked together through the InstanceKlass
3890 InstanceKlass* pv_node = previous_versions();
3891 InstanceKlass* last = this;
3892 int version = 0;
3893
3894 // check the previous versions list
3895 for (; pv_node != NULL; ) {
3896
3897 ConstantPool* pvcp = pv_node->constants();
3898 assert(pvcp != NULL, "cp ref was unexpectedly cleared");
3899
3900 if (!pvcp->on_stack()) {
3901 // If the constant pool isn't on stack, none of the methods
3902 // are executing. Unlink this previous_version.
3903 // The previous version InstanceKlass is on the ClassLoaderData deallocate list
3904 // so will be deallocated during the next phase of class unloading.
3905 log_trace(redefine, class, iklass, purge)
3906 ("previous version " INTPTR_FORMAT " is dead.", p2i(pv_node));
3907 // For debugging purposes.
3908 pv_node->set_is_scratch_class();
3909 // Unlink from previous version list.
3910 assert(pv_node->class_loader_data() == loader_data, "wrong loader_data");
3911 InstanceKlass* next = pv_node->previous_versions();
3912 pv_node->link_previous_versions(NULL); // point next to NULL
3913 last->link_previous_versions(next);
3914 // Add to the deallocate list after unlinking
3915 loader_data->add_to_deallocate_list(pv_node);
3916 pv_node = next;
3917 deleted_count++;
3918 version++;
3919 continue;
3920 } else {
3921 log_trace(redefine, class, iklass, purge)("previous version " INTPTR_FORMAT " is alive", p2i(pv_node));
3922 assert(pvcp->pool_holder() != NULL, "Constant pool with no holder");
3923 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
3924 live_count++;
3925 // found a previous version for next time we do class unloading
3926 _has_previous_versions = true;
3927 }
3928
3929 // At least one method is live in this previous version.
3930 // Reset dead EMCP methods not to get breakpoints.
3931 // All methods are deallocated when all of the methods for this class are no
3932 // longer running.
3933 Array<Method*>* method_refs = pv_node->methods();
3934 if (method_refs != NULL) {
3935 log_trace(redefine, class, iklass, purge)("previous methods length=%d", method_refs->length());
3936 for (int j = 0; j < method_refs->length(); j++) {
3937 Method* method = method_refs->at(j);
3938
3939 if (!method->on_stack()) {
3940 // no breakpoints for non-running methods
3941 if (method->is_running_emcp()) {
3942 method->set_running_emcp(false);
3943 }
3944 } else {
3945 assert (method->is_obsolete() || method->is_running_emcp(),
3946 "emcp method cannot run after emcp bit is cleared");
3947 log_trace(redefine, class, iklass, purge)
3948 ("purge: %s(%s): prev method @%d in version @%d is alive",
3949 method->name()->as_C_string(), method->signature()->as_C_string(), j, version);
3950 }
3951 }
3952 }
3953 // next previous version
3954 last = pv_node;
3955 pv_node = pv_node->previous_versions();
3956 version++;
3957 }
3958 log_trace(redefine, class, iklass, purge)
3959 ("previous version stats: live=%d, deleted=%d", live_count, deleted_count);
3960 }
3961
3962 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods,
3963 int emcp_method_count) {
3964 int obsolete_method_count = old_methods->length() - emcp_method_count;
3965
3966 if (emcp_method_count != 0 && obsolete_method_count != 0 &&
3967 _previous_versions != NULL) {
3968 // We have a mix of obsolete and EMCP methods so we have to
3969 // clear out any matching EMCP method entries the hard way.
3970 int local_count = 0;
3971 for (int i = 0; i < old_methods->length(); i++) {
3972 Method* old_method = old_methods->at(i);
3973 if (old_method->is_obsolete()) {
3974 // only obsolete methods are interesting
3975 Symbol* m_name = old_method->name();
3976 Symbol* m_signature = old_method->signature();
3977
3978 // previous versions are linked together through the InstanceKlass
3979 int j = 0;
3980 for (InstanceKlass* prev_version = _previous_versions;
3981 prev_version != NULL;
3982 prev_version = prev_version->previous_versions(), j++) {
3983
3984 Array<Method*>* method_refs = prev_version->methods();
3985 for (int k = 0; k < method_refs->length(); k++) {
3986 Method* method = method_refs->at(k);
3987
3988 if (!method->is_obsolete() &&
3989 method->name() == m_name &&
3990 method->signature() == m_signature) {
3991 // The current RedefineClasses() call has made all EMCP
3992 // versions of this method obsolete so mark it as obsolete
3993 log_trace(redefine, class, iklass, add)
3994 ("%s(%s): flush obsolete method @%d in version @%d",
3995 m_name->as_C_string(), m_signature->as_C_string(), k, j);
3996
3997 method->set_is_obsolete();
3998 break;
3999 }
4000 }
4001
4002 // The previous loop may not find a matching EMCP method, but
4003 // that doesn't mean that we can optimize and not go any
4004 // further back in the PreviousVersion generations. The EMCP
4005 // method for this generation could have already been made obsolete,
4006 // but there still may be an older EMCP method that has not
4007 // been made obsolete.
4008 }
4009
4010 if (++local_count >= obsolete_method_count) {
4011 // no more obsolete methods so bail out now
4012 break;
4013 }
4014 }
4015 }
4016 }
4017 }
4018
4019 // Save the scratch_class as the previous version if any of the methods are running.
4020 // The previous_versions are used to set breakpoints in EMCP methods and they are
4021 // also used to clean MethodData links to redefined methods that are no longer running.
4022 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class,
4023 int emcp_method_count) {
4024 assert(Thread::current()->is_VM_thread(),
4025 "only VMThread can add previous versions");
4026
4027 ResourceMark rm;
4028 log_trace(redefine, class, iklass, add)
4029 ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count);
4030
4031 // Clean out old previous versions for this class
4032 purge_previous_version_list();
4033
4034 // Mark newly obsolete methods in remaining previous versions. An EMCP method from
4035 // a previous redefinition may be made obsolete by this redefinition.
4036 Array<Method*>* old_methods = scratch_class->methods();
4037 mark_newly_obsolete_methods(old_methods, emcp_method_count);
4038
4039 // If the constant pool for this previous version of the class
4040 // is not marked as being on the stack, then none of the methods
4041 // in this previous version of the class are on the stack so
4042 // we don't need to add this as a previous version.
4043 ConstantPool* cp_ref = scratch_class->constants();
4044 if (!cp_ref->on_stack()) {
4045 log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running");
4046 // For debugging purposes.
4047 scratch_class->set_is_scratch_class();
4048 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class);
4049 return;
4050 }
4051
4052 if (emcp_method_count != 0) {
4053 // At least one method is still running, check for EMCP methods
4054 for (int i = 0; i < old_methods->length(); i++) {
4055 Method* old_method = old_methods->at(i);
4056 if (!old_method->is_obsolete() && old_method->on_stack()) {
4057 // if EMCP method (not obsolete) is on the stack, mark as EMCP so that
4058 // we can add breakpoints for it.
4059
4060 // We set the method->on_stack bit during safepoints for class redefinition
4061 // and use this bit to set the is_running_emcp bit.
4062 // After the safepoint, the on_stack bit is cleared and the running emcp
4063 // method may exit. If so, we would set a breakpoint in a method that
4064 // is never reached, but this won't be noticeable to the programmer.
4065 old_method->set_running_emcp(true);
4066 log_trace(redefine, class, iklass, add)
4067 ("EMCP method %s is on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
4068 } else if (!old_method->is_obsolete()) {
4069 log_trace(redefine, class, iklass, add)
4070 ("EMCP method %s is NOT on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
4071 }
4072 }
4073 }
4074
4075 // Add previous version if any methods are still running.
4076 // Set has_previous_version flag for processing during class unloading.
4077 _has_previous_versions = true;
4078 log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack.");
4079 assert(scratch_class->previous_versions() == NULL, "shouldn't have a previous version");
4080 scratch_class->link_previous_versions(previous_versions());
4081 link_previous_versions(scratch_class);
4082 } // end add_previous_version()
4083
4084 #endif // INCLUDE_JVMTI
4085
4086 Method* InstanceKlass::method_with_idnum(int idnum) {
4087 Method* m = NULL;
4088 if (idnum < methods()->length()) {
4089 m = methods()->at(idnum);
4090 }
4091 if (m == NULL || m->method_idnum() != idnum) {
4092 for (int index = 0; index < methods()->length(); ++index) {
4093 m = methods()->at(index);
4094 if (m->method_idnum() == idnum) {
4095 return m;
4096 }
4097 }
4098 // None found, return null for the caller to handle.
4099 return NULL;
4100 }
4101 return m;
4102 }
4103
4104
4105 Method* InstanceKlass::method_with_orig_idnum(int idnum) {
4106 if (idnum >= methods()->length()) {
4107 return NULL;
4108 }
4109 Method* m = methods()->at(idnum);
4110 if (m != NULL && m->orig_method_idnum() == idnum) {
4111 return m;
4112 }
4113 // Obsolete method idnum does not match the original idnum
4114 for (int index = 0; index < methods()->length(); ++index) {
4115 m = methods()->at(index);
4116 if (m->orig_method_idnum() == idnum) {
4117 return m;
4118 }
4119 }
4120 // None found, return null for the caller to handle.
4121 return NULL;
4122 }
4123
4124
4125 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) {
4126 InstanceKlass* holder = get_klass_version(version);
4127 if (holder == NULL) {
4128 return NULL; // The version of klass is gone, no method is found
4129 }
4130 Method* method = holder->method_with_orig_idnum(idnum);
4131 return method;
4132 }
4133
4134 #if INCLUDE_JVMTI
4135 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() {
4136 return _cached_class_file;
4137 }
4138
4139 jint InstanceKlass::get_cached_class_file_len() {
4140 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
4141 }
4142
4143 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
4144 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
4145 }
4146 #endif