1 /*
2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "aot/aotLoader.hpp"
28 #include "classfile/classFileParser.hpp"
29 #include "classfile/classFileStream.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/classLoaderData.inline.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/resolutionErrors.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/systemDictionaryShared.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "code/dependencyContext.hpp"
41 #include "compiler/compileBroker.hpp"
42 #include "gc/shared/collectedHeap.inline.hpp"
43 #include "interpreter/oopMapCache.hpp"
44 #include "interpreter/rewriter.hpp"
45 #include "jvmtifiles/jvmti.h"
46 #include "logging/log.hpp"
47 #include "logging/logMessage.hpp"
48 #include "logging/logStream.hpp"
49 #include "memory/allocation.inline.hpp"
50 #include "memory/iterator.inline.hpp"
51 #include "memory/metadataFactory.hpp"
52 #include "memory/metaspaceClosure.hpp"
53 #include "memory/metaspaceShared.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/resourceArea.hpp"
56 #include "memory/universe.hpp"
57 #include "oops/fieldStreams.inline.hpp"
58 #include "oops/constantPool.hpp"
59 #include "oops/instanceClassLoaderKlass.hpp"
60 #include "oops/instanceKlass.inline.hpp"
61 #include "oops/instanceMirrorKlass.hpp"
62 #include "oops/instanceOop.hpp"
63 #include "oops/klass.inline.hpp"
64 #include "oops/method.hpp"
65 #include "oops/oop.inline.hpp"
66 #include "oops/recordComponent.hpp"
67 #include "oops/symbol.hpp"
68 #include "prims/jvmtiExport.hpp"
69 #include "prims/jvmtiRedefineClasses.hpp"
70 #include "prims/jvmtiThreadState.hpp"
71 #include "prims/methodComparator.hpp"
72 #include "runtime/atomic.hpp"
73 #include "runtime/biasedLocking.hpp"
74 #include "runtime/fieldDescriptor.inline.hpp"
75 #include "runtime/handles.inline.hpp"
76 #include "runtime/javaCalls.hpp"
77 #include "runtime/mutexLocker.hpp"
78 #include "runtime/orderAccess.hpp"
79 #include "runtime/thread.inline.hpp"
80 #include "services/classLoadingService.hpp"
81 #include "services/threadService.hpp"
82 #include "utilities/dtrace.hpp"
83 #include "utilities/events.hpp"
84 #include "utilities/macros.hpp"
85 #include "utilities/stringUtils.hpp"
86 #ifdef COMPILER1
87 #include "c1/c1_Compiler.hpp"
88 #endif
89 #if INCLUDE_JFR
90 #include "jfr/jfrEvents.hpp"
91 #endif
92
93
94 #ifdef DTRACE_ENABLED
95
96
97 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED
98 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE
99 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT
100 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS
101 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED
102 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT
103 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR
104 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END
105 #define DTRACE_CLASSINIT_PROBE(type, thread_type) \
106 { \
107 char* data = NULL; \
108 int len = 0; \
109 Symbol* clss_name = name(); \
110 if (clss_name != NULL) { \
111 data = (char*)clss_name->bytes(); \
112 len = clss_name->utf8_length(); \
113 } \
114 HOTSPOT_CLASS_INITIALIZATION_##type( \
115 data, len, (void*)class_loader(), thread_type); \
116 }
117
118 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) \
119 { \
120 char* data = NULL; \
121 int len = 0; \
122 Symbol* clss_name = name(); \
123 if (clss_name != NULL) { \
124 data = (char*)clss_name->bytes(); \
125 len = clss_name->utf8_length(); \
126 } \
127 HOTSPOT_CLASS_INITIALIZATION_##type( \
128 data, len, (void*)class_loader(), thread_type, wait); \
129 }
130
131 #else // ndef DTRACE_ENABLED
132
133 #define DTRACE_CLASSINIT_PROBE(type, thread_type)
134 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait)
135
136 #endif // ndef DTRACE_ENABLED
137
138
139 static inline bool is_class_loader(const Symbol* class_name,
140 const ClassFileParser& parser) {
141 assert(class_name != NULL, "invariant");
142
143 if (class_name == vmSymbols::java_lang_ClassLoader()) {
144 return true;
145 }
146
147 if (SystemDictionary::ClassLoader_klass_loaded()) {
148 const Klass* const super_klass = parser.super_klass();
149 if (super_klass != NULL) {
150 if (super_klass->is_subtype_of(SystemDictionary::ClassLoader_klass())) {
151 return true;
152 }
153 }
154 }
155 return false;
156 }
157
158 // private: called to verify that k is a static member of this nest.
159 // We know that k is an instance class in the same package and hence the
160 // same classloader.
161 bool InstanceKlass::has_nest_member(InstanceKlass* k, TRAPS) const {
162 assert(!is_hidden(), "unexpected hidden class");
163 if (_nest_members == NULL || _nest_members == Universe::the_empty_short_array()) {
164 if (log_is_enabled(Trace, class, nestmates)) {
165 ResourceMark rm(THREAD);
166 log_trace(class, nestmates)("Checked nest membership of %s in non-nest-host class %s",
167 k->external_name(), this->external_name());
168 }
169 return false;
170 }
171
172 if (log_is_enabled(Trace, class, nestmates)) {
173 ResourceMark rm(THREAD);
174 log_trace(class, nestmates)("Checking nest membership of %s in %s",
175 k->external_name(), this->external_name());
176 }
177
178 // Check for a resolved cp entry , else fall back to a name check.
179 // We don't want to resolve any class other than the one being checked.
180 for (int i = 0; i < _nest_members->length(); i++) {
181 int cp_index = _nest_members->at(i);
182 if (_constants->tag_at(cp_index).is_klass()) {
183 Klass* k2 = _constants->klass_at(cp_index, THREAD);
184 assert(!HAS_PENDING_EXCEPTION || PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass()),
185 "Exceptions should not be possible here");
186 if (k2 == k) {
187 log_trace(class, nestmates)("- class is listed at nest_members[%d] => cp[%d]", i, cp_index);
188 return true;
189 }
190 }
191 else {
192 Symbol* name = _constants->klass_name_at(cp_index);
193 if (name == k->name()) {
194 log_trace(class, nestmates)("- Found it at nest_members[%d] => cp[%d]", i, cp_index);
195
196 // Names match so check actual klass. This may trigger class loading if
197 // it doesn't match though that should be impossible as it means one classloader
198 // has defined two different classes with the same name! A compiler thread won't be
199 // able to perform that loading but we can't exclude the compiler threads from
200 // executing this logic. But it should actually be impossible to trigger loading here.
201 Klass* k2 = _constants->klass_at(cp_index, THREAD);
202 assert(!HAS_PENDING_EXCEPTION || PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass()),
203 "Exceptions should not be possible here");
204 if (k2 == k) {
205 log_trace(class, nestmates)("- class is listed as a nest member");
206 return true;
207 }
208 else {
209 // same name but different klass!
210 log_trace(class, nestmates)(" - klass comparison failed!");
211 // can't have two names the same, so we're done
212 return false;
213 }
214 }
215 }
216 }
217 log_trace(class, nestmates)("- class is NOT a nest member!");
218 return false;
219 }
220
221 // Return nest-host class, resolving, validating and saving it if needed.
222 // In cases where this is called from a thread that cannot do classloading
223 // (such as a native JIT thread) then we simply return NULL, which in turn
224 // causes the access check to return false. Such code will retry the access
225 // from a more suitable environment later. Otherwise the _nest_host is always
226 // set once this method returns.
227 // Any errors from nest-host resolution must be preserved so they can be queried
228 // from higher-level access checking code, and reported as part of access checking
229 // exceptions.
230 // VirtualMachineErrors are propagated with a NULL return.
231 // Under any conditions where the _nest_host can be set to non-NULL the resulting
232 // value of it and, if applicable, the nest host resolution/validation error,
233 // are idempotent.
234 InstanceKlass* InstanceKlass::nest_host(TRAPS) {
235 InstanceKlass* nest_host_k = _nest_host;
236 if (nest_host_k != NULL) {
237 return nest_host_k;
238 }
239
240 ResourceMark rm(THREAD);
241
242 // need to resolve and save our nest-host class.
243 if (_nest_host_index != 0) { // we have a real nest_host
244 // Before trying to resolve check if we're in a suitable context
245 if (!THREAD->can_call_java() && !_constants->tag_at(_nest_host_index).is_klass()) {
246 log_trace(class, nestmates)("Rejected resolution of nest-host of %s in unsuitable thread",
247 this->external_name());
248 return NULL; // sentinel to say "try again from a different context"
249 }
250
251 log_trace(class, nestmates)("Resolving nest-host of %s using cp entry for %s",
252 this->external_name(),
253 _constants->klass_name_at(_nest_host_index)->as_C_string());
254
255 Klass* k = _constants->klass_at(_nest_host_index, THREAD);
256 if (HAS_PENDING_EXCEPTION) {
257 if (PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass())) {
258 return NULL; // propagate VMEs
259 }
260 stringStream ss;
261 char* target_host_class = _constants->klass_name_at(_nest_host_index)->as_C_string();
262 ss.print("Nest host resolution of %s with host %s failed: ",
263 this->external_name(), target_host_class);
264 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
265 const char* msg = ss.as_string(true /* on C-heap */);
266 constantPoolHandle cph(THREAD, constants());
267 SystemDictionary::add_nest_host_error(cph, _nest_host_index, msg);
268 CLEAR_PENDING_EXCEPTION;
269
270 log_trace(class, nestmates)("%s", msg);
271 } else {
272 // A valid nest-host is an instance class in the current package that lists this
273 // class as a nest member. If any of these conditions are not met the class is
274 // its own nest-host.
275 const char* error = NULL;
276
277 // JVMS 5.4.4 indicates package check comes first
278 if (is_same_class_package(k)) {
279 // Now check actual membership. We can't be a member if our "host" is
280 // not an instance class.
281 if (k->is_instance_klass()) {
282 nest_host_k = InstanceKlass::cast(k);
283 bool is_member = nest_host_k->has_nest_member(this, THREAD);
284 // exception is rare, perhaps impossible
285 if (!HAS_PENDING_EXCEPTION) {
286 if (is_member) {
287 _nest_host = nest_host_k; // save resolved nest-host value
288
289 log_trace(class, nestmates)("Resolved nest-host of %s to %s",
290 this->external_name(), k->external_name());
291 return nest_host_k;
292 } else {
293 error = "current type is not listed as a nest member";
294 }
295 } else {
296 if (PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass())) {
297 return NULL; // propagate VMEs
298 }
299 stringStream ss;
300 ss.print("exception on member check: ");
301 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
302 error = ss.as_string();
303 }
304 } else {
305 error = "host is not an instance class";
306 }
307 } else {
308 error = "types are in different packages";
309 }
310
311 // something went wrong, so record what and log it
312 {
313 stringStream ss;
314 ss.print("Type %s (loader: %s) is not a nest member of type %s (loader: %s): %s",
315 this->external_name(),
316 this->class_loader_data()->loader_name_and_id(),
317 k->external_name(),
318 k->class_loader_data()->loader_name_and_id(),
319 error);
320 const char* msg = ss.as_string(true /* on C-heap */);
321 constantPoolHandle cph(THREAD, constants());
322 SystemDictionary::add_nest_host_error(cph, _nest_host_index, msg);
323 log_trace(class, nestmates)("%s", msg);
324 }
325 }
326 } else {
327 log_trace(class, nestmates)("Type %s is not part of a nest: setting nest-host to self",
328 this->external_name());
329 }
330
331 // Either not in an explicit nest, or else an error occurred, so
332 // the nest-host is set to `this`. Any thread that sees this assignment
333 // will also see any setting of nest_host_error(), if applicable.
334 return (_nest_host = this);
335 }
336
337 // Dynamic nest member support: set this class's nest host to the given class.
338 // This occurs as part of the class definition, as soon as the instanceKlass
339 // has been created and doesn't require further resolution. The code:
340 // lookup().defineHiddenClass(bytes_for_X, NESTMATE);
341 // results in:
342 // class_of_X.set_nest_host(lookup().lookupClass().getNestHost())
343 // If it has an explicit _nest_host_index or _nest_members, these will be ignored.
344 // We also know the "host" is a valid nest-host in the same package so we can
345 // assert some of those facts.
346 void InstanceKlass::set_nest_host(InstanceKlass* host, TRAPS) {
347 assert(is_hidden(), "must be a hidden class");
348 assert(host != NULL, "NULL nest host specified");
349 assert(_nest_host == NULL, "current class has resolved nest-host");
350 assert(nest_host_error(THREAD) == NULL, "unexpected nest host resolution error exists: %s",
351 nest_host_error(THREAD));
352 assert((host->_nest_host == NULL && host->_nest_host_index == 0) ||
353 (host->_nest_host == host), "proposed host is not a valid nest-host");
354 // Can't assert this as package is not set yet:
355 // assert(is_same_class_package(host), "proposed host is in wrong package");
356
357 if (log_is_enabled(Trace, class, nestmates)) {
358 ResourceMark rm(THREAD);
359 const char* msg = "";
360 // a hidden class does not expect a statically defined nest-host
361 if (_nest_host_index > 0) {
362 msg = "(the NestHost attribute in the current class is ignored)";
363 } else if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
364 msg = "(the NestMembers attribute in the current class is ignored)";
365 }
366 log_trace(class, nestmates)("Injected type %s into the nest of %s %s",
367 this->external_name(),
368 host->external_name(),
369 msg);
370 }
371 // set dynamic nest host
372 _nest_host = host;
373 // Record dependency to keep nest host from being unloaded before this class.
374 ClassLoaderData* this_key = class_loader_data();
375 this_key->record_dependency(host);
376 }
377
378 // check if 'this' and k are nestmates (same nest_host), or k is our nest_host,
379 // or we are k's nest_host - all of which is covered by comparing the two
380 // resolved_nest_hosts.
381 // Any exceptions (i.e. VMEs) are propagated.
382 bool InstanceKlass::has_nestmate_access_to(InstanceKlass* k, TRAPS) {
383
384 assert(this != k, "this should be handled by higher-level code");
385
386 // Per JVMS 5.4.4 we first resolve and validate the current class, then
387 // the target class k.
388
389 InstanceKlass* cur_host = nest_host(CHECK_false);
390 if (cur_host == NULL) {
391 return false;
392 }
393
394 Klass* k_nest_host = k->nest_host(CHECK_false);
395 if (k_nest_host == NULL) {
396 return false;
397 }
398
399 bool access = (cur_host == k_nest_host);
400
401 ResourceMark rm(THREAD);
402 log_trace(class, nestmates)("Class %s does %shave nestmate access to %s",
403 this->external_name(),
404 access ? "" : "NOT ",
405 k->external_name());
406 return access;
407 }
408
409 const char* InstanceKlass::nest_host_error(TRAPS) {
410 if (_nest_host_index == 0) {
411 return NULL;
412 } else {
413 constantPoolHandle cph(THREAD, constants());
414 return SystemDictionary::find_nest_host_error(cph, (int)_nest_host_index);
415 }
416 }
417
418 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) {
419 bool is_hidden_or_anonymous = parser.is_hidden() || parser.is_unsafe_anonymous();
420 const int size = InstanceKlass::size(parser.vtable_size(),
421 parser.itable_size(),
422 nonstatic_oop_map_size(parser.total_oop_map_count()),
423 parser.is_interface(),
424 parser.is_unsafe_anonymous(),
425 should_store_fingerprint(is_hidden_or_anonymous));
426
427 const Symbol* const class_name = parser.class_name();
428 assert(class_name != NULL, "invariant");
429 ClassLoaderData* loader_data = parser.loader_data();
430 assert(loader_data != NULL, "invariant");
431
432 InstanceKlass* ik;
433
434 // Allocation
435 if (REF_NONE == parser.reference_type()) {
436 if (class_name == vmSymbols::java_lang_Class()) {
437 // mirror
438 ik = new (loader_data, size, THREAD) InstanceMirrorKlass(parser);
439 }
440 else if (is_class_loader(class_name, parser)) {
441 // class loader
442 ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser);
443 } else {
444 // normal
445 ik = new (loader_data, size, THREAD) InstanceKlass(parser, InstanceKlass::_kind_other);
446 }
447 } else {
448 // reference
449 ik = new (loader_data, size, THREAD) InstanceRefKlass(parser);
450 }
451
452 // Check for pending exception before adding to the loader data and incrementing
453 // class count. Can get OOM here.
454 if (HAS_PENDING_EXCEPTION) {
455 return NULL;
456 }
457
458 return ik;
459 }
460
461
462 // copy method ordering from resource area to Metaspace
463 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) {
464 if (m != NULL) {
465 // allocate a new array and copy contents (memcpy?)
466 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
467 for (int i = 0; i < m->length(); i++) {
468 _method_ordering->at_put(i, m->at(i));
469 }
470 } else {
471 _method_ordering = Universe::the_empty_int_array();
472 }
473 }
474
475 // create a new array of vtable_indices for default methods
476 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
477 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
478 assert(default_vtable_indices() == NULL, "only create once");
479 set_default_vtable_indices(vtable_indices);
480 return vtable_indices;
481 }
482
483 InstanceKlass::InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id) :
484 Klass(id),
485 _nest_members(NULL),
486 _nest_host(NULL),
487 _record_components(NULL),
488 _static_field_size(parser.static_field_size()),
489 _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())),
490 _itable_len(parser.itable_size()),
491 _nest_host_index(0),
492 _init_state(allocated),
493 _reference_type(parser.reference_type()),
494 _init_thread(NULL)
495 {
496 set_vtable_length(parser.vtable_size());
497 set_kind(kind);
498 set_access_flags(parser.access_flags());
499 if (parser.is_hidden()) set_is_hidden();
500 set_is_unsafe_anonymous(parser.is_unsafe_anonymous());
501 set_layout_helper(Klass::instance_layout_helper(parser.layout_size(),
502 false));
503
504 assert(NULL == _methods, "underlying memory not zeroed?");
505 assert(is_instance_klass(), "is layout incorrect?");
506 assert(size_helper() == parser.layout_size(), "incorrect size_helper?");
507
508 // Set biased locking bit for all instances of this class; it will be
509 // cleared if revocation occurs too often for this type
510 if (UseBiasedLocking && BiasedLocking::enabled()) {
511 set_prototype_header(markWord::biased_locking_prototype());
512 }
513 }
514
515 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
516 Array<Method*>* methods) {
517 if (methods != NULL && methods != Universe::the_empty_method_array() &&
518 !methods->is_shared()) {
519 for (int i = 0; i < methods->length(); i++) {
520 Method* method = methods->at(i);
521 if (method == NULL) continue; // maybe null if error processing
522 // Only want to delete methods that are not executing for RedefineClasses.
523 // The previous version will point to them so they're not totally dangling
524 assert (!method->on_stack(), "shouldn't be called with methods on stack");
525 MetadataFactory::free_metadata(loader_data, method);
526 }
527 MetadataFactory::free_array<Method*>(loader_data, methods);
528 }
529 }
530
531 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
532 const Klass* super_klass,
533 Array<InstanceKlass*>* local_interfaces,
534 Array<InstanceKlass*>* transitive_interfaces) {
535 // Only deallocate transitive interfaces if not empty, same as super class
536 // or same as local interfaces. See code in parseClassFile.
537 Array<InstanceKlass*>* ti = transitive_interfaces;
538 if (ti != Universe::the_empty_instance_klass_array() && ti != local_interfaces) {
539 // check that the interfaces don't come from super class
540 Array<InstanceKlass*>* sti = (super_klass == NULL) ? NULL :
541 InstanceKlass::cast(super_klass)->transitive_interfaces();
542 if (ti != sti && ti != NULL && !ti->is_shared()) {
543 MetadataFactory::free_array<InstanceKlass*>(loader_data, ti);
544 }
545 }
546
547 // local interfaces can be empty
548 if (local_interfaces != Universe::the_empty_instance_klass_array() &&
549 local_interfaces != NULL && !local_interfaces->is_shared()) {
550 MetadataFactory::free_array<InstanceKlass*>(loader_data, local_interfaces);
551 }
552 }
553
554 void InstanceKlass::deallocate_record_components(ClassLoaderData* loader_data,
555 Array<RecordComponent*>* record_components) {
556 if (record_components != NULL && !record_components->is_shared()) {
557 for (int i = 0; i < record_components->length(); i++) {
558 RecordComponent* record_component = record_components->at(i);
559 MetadataFactory::free_metadata(loader_data, record_component);
560 }
561 MetadataFactory::free_array<RecordComponent*>(loader_data, record_components);
562 }
563 }
564
565 // This function deallocates the metadata and C heap pointers that the
566 // InstanceKlass points to.
567 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
568
569 // Orphan the mirror first, CMS thinks it's still live.
570 if (java_mirror() != NULL) {
571 java_lang_Class::set_klass(java_mirror(), NULL);
572 }
573
574 // Also remove mirror from handles
575 loader_data->remove_handle(_java_mirror);
576
577 // Need to take this class off the class loader data list.
578 loader_data->remove_class(this);
579
580 // The array_klass for this class is created later, after error handling.
581 // For class redefinition, we keep the original class so this scratch class
582 // doesn't have an array class. Either way, assert that there is nothing
583 // to deallocate.
584 assert(array_klasses() == NULL, "array classes shouldn't be created for this class yet");
585
586 // Release C heap allocated data that this points to, which includes
587 // reference counting symbol names.
588 release_C_heap_structures_internal();
589
590 deallocate_methods(loader_data, methods());
591 set_methods(NULL);
592
593 deallocate_record_components(loader_data, record_components());
594 set_record_components(NULL);
595
596 if (method_ordering() != NULL &&
597 method_ordering() != Universe::the_empty_int_array() &&
598 !method_ordering()->is_shared()) {
599 MetadataFactory::free_array<int>(loader_data, method_ordering());
600 }
601 set_method_ordering(NULL);
602
603 // default methods can be empty
604 if (default_methods() != NULL &&
605 default_methods() != Universe::the_empty_method_array() &&
606 !default_methods()->is_shared()) {
607 MetadataFactory::free_array<Method*>(loader_data, default_methods());
608 }
609 // Do NOT deallocate the default methods, they are owned by superinterfaces.
610 set_default_methods(NULL);
611
612 // default methods vtable indices can be empty
613 if (default_vtable_indices() != NULL &&
614 !default_vtable_indices()->is_shared()) {
615 MetadataFactory::free_array<int>(loader_data, default_vtable_indices());
616 }
617 set_default_vtable_indices(NULL);
618
619
620 // This array is in Klass, but remove it with the InstanceKlass since
621 // this place would be the only caller and it can share memory with transitive
622 // interfaces.
623 if (secondary_supers() != NULL &&
624 secondary_supers() != Universe::the_empty_klass_array() &&
625 // see comments in compute_secondary_supers about the following cast
626 (address)(secondary_supers()) != (address)(transitive_interfaces()) &&
627 !secondary_supers()->is_shared()) {
628 MetadataFactory::free_array<Klass*>(loader_data, secondary_supers());
629 }
630 set_secondary_supers(NULL);
631
632 deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces());
633 set_transitive_interfaces(NULL);
634 set_local_interfaces(NULL);
635
636 if (fields() != NULL && !fields()->is_shared()) {
637 MetadataFactory::free_array<jushort>(loader_data, fields());
638 }
639 set_fields(NULL, 0);
640
641 // If a method from a redefined class is using this constant pool, don't
642 // delete it, yet. The new class's previous version will point to this.
643 if (constants() != NULL) {
644 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack");
645 if (!constants()->is_shared()) {
646 MetadataFactory::free_metadata(loader_data, constants());
647 }
648 // Delete any cached resolution errors for the constant pool
649 SystemDictionary::delete_resolution_error(constants());
650
651 set_constants(NULL);
652 }
653
654 if (inner_classes() != NULL &&
655 inner_classes() != Universe::the_empty_short_array() &&
656 !inner_classes()->is_shared()) {
657 MetadataFactory::free_array<jushort>(loader_data, inner_classes());
658 }
659 set_inner_classes(NULL);
660
661 if (nest_members() != NULL &&
662 nest_members() != Universe::the_empty_short_array() &&
663 !nest_members()->is_shared()) {
664 MetadataFactory::free_array<jushort>(loader_data, nest_members());
665 }
666 set_nest_members(NULL);
667
668 // We should deallocate the Annotations instance if it's not in shared spaces.
669 if (annotations() != NULL && !annotations()->is_shared()) {
670 MetadataFactory::free_metadata(loader_data, annotations());
671 }
672 set_annotations(NULL);
673
674 if (Arguments::is_dumping_archive()) {
675 SystemDictionaryShared::remove_dumptime_info(this);
676 }
677 }
678
679 bool InstanceKlass::should_be_initialized() const {
680 return !is_initialized();
681 }
682
683 klassItable InstanceKlass::itable() const {
684 return klassItable(const_cast<InstanceKlass*>(this));
685 }
686
687 void InstanceKlass::eager_initialize(Thread *thread) {
688 if (!EagerInitialization) return;
689
690 if (this->is_not_initialized()) {
691 // abort if the the class has a class initializer
692 if (this->class_initializer() != NULL) return;
693
694 // abort if it is java.lang.Object (initialization is handled in genesis)
695 Klass* super_klass = super();
696 if (super_klass == NULL) return;
697
698 // abort if the super class should be initialized
699 if (!InstanceKlass::cast(super_klass)->is_initialized()) return;
700
701 // call body to expose the this pointer
702 eager_initialize_impl();
703 }
704 }
705
706 // JVMTI spec thinks there are signers and protection domain in the
707 // instanceKlass. These accessors pretend these fields are there.
708 // The hprof specification also thinks these fields are in InstanceKlass.
709 oop InstanceKlass::protection_domain() const {
710 // return the protection_domain from the mirror
711 return java_lang_Class::protection_domain(java_mirror());
712 }
713
714 // To remove these from requires an incompatible change and CCC request.
715 objArrayOop InstanceKlass::signers() const {
716 // return the signers from the mirror
717 return java_lang_Class::signers(java_mirror());
718 }
719
720 oop InstanceKlass::init_lock() const {
721 // return the init lock from the mirror
722 oop lock = java_lang_Class::init_lock(java_mirror());
723 // Prevent reordering with any access of initialization state
724 OrderAccess::loadload();
725 assert((oop)lock != NULL || !is_not_initialized(), // initialized or in_error state
726 "only fully initialized state can have a null lock");
727 return lock;
728 }
729
730 // Set the initialization lock to null so the object can be GC'ed. Any racing
731 // threads to get this lock will see a null lock and will not lock.
732 // That's okay because they all check for initialized state after getting
733 // the lock and return.
734 void InstanceKlass::fence_and_clear_init_lock() {
735 // make sure previous stores are all done, notably the init_state.
736 OrderAccess::storestore();
737 java_lang_Class::set_init_lock(java_mirror(), NULL);
738 assert(!is_not_initialized(), "class must be initialized now");
739 }
740
741 void InstanceKlass::eager_initialize_impl() {
742 EXCEPTION_MARK;
743 HandleMark hm(THREAD);
744 Handle h_init_lock(THREAD, init_lock());
745 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
746
747 // abort if someone beat us to the initialization
748 if (!is_not_initialized()) return; // note: not equivalent to is_initialized()
749
750 ClassState old_state = init_state();
751 link_class_impl(THREAD);
752 if (HAS_PENDING_EXCEPTION) {
753 CLEAR_PENDING_EXCEPTION;
754 // Abort if linking the class throws an exception.
755
756 // Use a test to avoid redundantly resetting the state if there's
757 // no change. Set_init_state() asserts that state changes make
758 // progress, whereas here we might just be spinning in place.
759 if (old_state != _init_state)
760 set_init_state(old_state);
761 } else {
762 // linking successfull, mark class as initialized
763 set_init_state(fully_initialized);
764 fence_and_clear_init_lock();
765 // trace
766 if (log_is_enabled(Info, class, init)) {
767 ResourceMark rm(THREAD);
768 log_info(class, init)("[Initialized %s without side effects]", external_name());
769 }
770 }
771 }
772
773
774 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization
775 // process. The step comments refers to the procedure described in that section.
776 // Note: implementation moved to static method to expose the this pointer.
777 void InstanceKlass::initialize(TRAPS) {
778 if (this->should_be_initialized()) {
779 initialize_impl(CHECK);
780 // Note: at this point the class may be initialized
781 // OR it may be in the state of being initialized
782 // in case of recursive initialization!
783 } else {
784 assert(is_initialized(), "sanity check");
785 }
786 }
787
788
789 bool InstanceKlass::verify_code(TRAPS) {
790 // 1) Verify the bytecodes
791 return Verifier::verify(this, should_verify_class(), THREAD);
792 }
793
794 void InstanceKlass::link_class(TRAPS) {
795 assert(is_loaded(), "must be loaded");
796 if (!is_linked()) {
797 link_class_impl(CHECK);
798 }
799 }
800
801 // Called to verify that a class can link during initialization, without
802 // throwing a VerifyError.
803 bool InstanceKlass::link_class_or_fail(TRAPS) {
804 assert(is_loaded(), "must be loaded");
805 if (!is_linked()) {
806 link_class_impl(CHECK_false);
807 }
808 return is_linked();
809 }
810
811 bool InstanceKlass::link_class_impl(TRAPS) {
812 if (DumpSharedSpaces && SystemDictionaryShared::has_class_failed_verification(this)) {
813 // This is for CDS dumping phase only -- we use the in_error_state to indicate that
814 // the class has failed verification. Throwing the NoClassDefFoundError here is just
815 // a convenient way to stop repeat attempts to verify the same (bad) class.
816 //
817 // Note that the NoClassDefFoundError is not part of the JLS, and should not be thrown
818 // if we are executing Java code. This is not a problem for CDS dumping phase since
819 // it doesn't execute any Java code.
820 ResourceMark rm(THREAD);
821 Exceptions::fthrow(THREAD_AND_LOCATION,
822 vmSymbols::java_lang_NoClassDefFoundError(),
823 "Class %s, or one of its supertypes, failed class initialization",
824 external_name());
825 return false;
826 }
827 // return if already verified
828 if (is_linked()) {
829 return true;
830 }
831
832 // Timing
833 // timer handles recursion
834 assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl");
835 JavaThread* jt = (JavaThread*)THREAD;
836
837 // link super class before linking this class
838 Klass* super_klass = super();
839 if (super_klass != NULL) {
840 if (super_klass->is_interface()) { // check if super class is an interface
841 ResourceMark rm(THREAD);
842 Exceptions::fthrow(
843 THREAD_AND_LOCATION,
844 vmSymbols::java_lang_IncompatibleClassChangeError(),
845 "class %s has interface %s as super class",
846 external_name(),
847 super_klass->external_name()
848 );
849 return false;
850 }
851
852 InstanceKlass* ik_super = InstanceKlass::cast(super_klass);
853 ik_super->link_class_impl(CHECK_false);
854 }
855
856 // link all interfaces implemented by this class before linking this class
857 Array<InstanceKlass*>* interfaces = local_interfaces();
858 int num_interfaces = interfaces->length();
859 for (int index = 0; index < num_interfaces; index++) {
860 InstanceKlass* interk = interfaces->at(index);
861 interk->link_class_impl(CHECK_false);
862 }
863
864 // in case the class is linked in the process of linking its superclasses
865 if (is_linked()) {
866 return true;
867 }
868
869 // trace only the link time for this klass that includes
870 // the verification time
871 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
872 ClassLoader::perf_class_link_selftime(),
873 ClassLoader::perf_classes_linked(),
874 jt->get_thread_stat()->perf_recursion_counts_addr(),
875 jt->get_thread_stat()->perf_timers_addr(),
876 PerfClassTraceTime::CLASS_LINK);
877
878 // verification & rewriting
879 {
880 HandleMark hm(THREAD);
881 Handle h_init_lock(THREAD, init_lock());
882 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
883 // rewritten will have been set if loader constraint error found
884 // on an earlier link attempt
885 // don't verify or rewrite if already rewritten
886 //
887
888 if (!is_linked()) {
889 if (!is_rewritten()) {
890 {
891 bool verify_ok = verify_code(THREAD);
892 if (!verify_ok) {
893 return false;
894 }
895 }
896
897 // Just in case a side-effect of verify linked this class already
898 // (which can sometimes happen since the verifier loads classes
899 // using custom class loaders, which are free to initialize things)
900 if (is_linked()) {
901 return true;
902 }
903
904 // also sets rewritten
905 rewrite_class(CHECK_false);
906 } else if (is_shared()) {
907 SystemDictionaryShared::check_verification_constraints(this, CHECK_false);
908 }
909
910 // relocate jsrs and link methods after they are all rewritten
911 link_methods(CHECK_false);
912
913 // Initialize the vtable and interface table after
914 // methods have been rewritten since rewrite may
915 // fabricate new Method*s.
916 // also does loader constraint checking
917 //
918 // initialize_vtable and initialize_itable need to be rerun
919 // for a shared class if
920 // 1) the class is loaded by custom class loader or
921 // 2) the class is loaded by built-in class loader but failed to add archived loader constraints
922 bool need_init_table = true;
923 if (is_shared() && SystemDictionaryShared::check_linking_constraints(this, THREAD)) {
924 need_init_table = false;
925 }
926 if (need_init_table) {
927 vtable().initialize_vtable(true, CHECK_false);
928 itable().initialize_itable(true, CHECK_false);
929 }
930 #ifdef ASSERT
931 vtable().verify(tty, true);
932 // In case itable verification is ever added.
933 // itable().verify(tty, true);
934 #endif
935 set_init_state(linked);
936 if (JvmtiExport::should_post_class_prepare()) {
937 Thread *thread = THREAD;
938 assert(thread->is_Java_thread(), "thread->is_Java_thread()");
939 JvmtiExport::post_class_prepare((JavaThread *) thread, this);
940 }
941 }
942 }
943 return true;
944 }
945
946 // Rewrite the byte codes of all of the methods of a class.
947 // The rewriter must be called exactly once. Rewriting must happen after
948 // verification but before the first method of the class is executed.
949 void InstanceKlass::rewrite_class(TRAPS) {
950 assert(is_loaded(), "must be loaded");
951 if (is_rewritten()) {
952 assert(is_shared(), "rewriting an unshared class?");
953 return;
954 }
955 Rewriter::rewrite(this, CHECK);
956 set_rewritten();
957 }
958
959 // Now relocate and link method entry points after class is rewritten.
960 // This is outside is_rewritten flag. In case of an exception, it can be
961 // executed more than once.
962 void InstanceKlass::link_methods(TRAPS) {
963 int len = methods()->length();
964 for (int i = len-1; i >= 0; i--) {
965 methodHandle m(THREAD, methods()->at(i));
966
967 // Set up method entry points for compiler and interpreter .
968 m->link_method(m, CHECK);
969 }
970 }
971
972 // Eagerly initialize superinterfaces that declare default methods (concrete instance: any access)
973 void InstanceKlass::initialize_super_interfaces(TRAPS) {
974 assert (has_nonstatic_concrete_methods(), "caller should have checked this");
975 for (int i = 0; i < local_interfaces()->length(); ++i) {
976 InstanceKlass* ik = local_interfaces()->at(i);
977
978 // Initialization is depth first search ie. we start with top of the inheritance tree
979 // has_nonstatic_concrete_methods drives searching superinterfaces since it
980 // means has_nonstatic_concrete_methods in its superinterface hierarchy
981 if (ik->has_nonstatic_concrete_methods()) {
982 ik->initialize_super_interfaces(CHECK);
983 }
984
985 // Only initialize() interfaces that "declare" concrete methods.
986 if (ik->should_be_initialized() && ik->declares_nonstatic_concrete_methods()) {
987 ik->initialize(CHECK);
988 }
989 }
990 }
991
992 void InstanceKlass::initialize_impl(TRAPS) {
993 HandleMark hm(THREAD);
994
995 // Make sure klass is linked (verified) before initialization
996 // A class could already be verified, since it has been reflected upon.
997 link_class(CHECK);
998
999 DTRACE_CLASSINIT_PROBE(required, -1);
1000
1001 bool wait = false;
1002
1003 assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl");
1004 JavaThread* jt = (JavaThread*)THREAD;
1005
1006 // refer to the JVM book page 47 for description of steps
1007 // Step 1
1008 {
1009 Handle h_init_lock(THREAD, init_lock());
1010 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
1011
1012 // Step 2
1013 // If we were to use wait() instead of waitInterruptibly() then
1014 // we might end up throwing IE from link/symbol resolution sites
1015 // that aren't expected to throw. This would wreak havoc. See 6320309.
1016 while (is_being_initialized() && !is_reentrant_initialization(jt)) {
1017 wait = true;
1018 jt->set_class_to_be_initialized(this);
1019 ol.wait_uninterruptibly(jt);
1020 jt->set_class_to_be_initialized(NULL);
1021 }
1022
1023 // Step 3
1024 if (is_being_initialized() && is_reentrant_initialization(jt)) {
1025 DTRACE_CLASSINIT_PROBE_WAIT(recursive, -1, wait);
1026 return;
1027 }
1028
1029 // Step 4
1030 if (is_initialized()) {
1031 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, -1, wait);
1032 return;
1033 }
1034
1035 // Step 5
1036 if (is_in_error_state()) {
1037 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait);
1038 ResourceMark rm(THREAD);
1039 const char* desc = "Could not initialize class ";
1040 const char* className = external_name();
1041 size_t msglen = strlen(desc) + strlen(className) + 1;
1042 char* message = NEW_RESOURCE_ARRAY(char, msglen);
1043 if (NULL == message) {
1044 // Out of memory: can't create detailed error message
1045 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className);
1046 } else {
1047 jio_snprintf(message, msglen, "%s%s", desc, className);
1048 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message);
1049 }
1050 }
1051
1052 // Step 6
1053 set_init_state(being_initialized);
1054 set_init_thread(jt);
1055 }
1056
1057 // Step 7
1058 // Next, if C is a class rather than an interface, initialize it's super class and super
1059 // interfaces.
1060 if (!is_interface()) {
1061 Klass* super_klass = super();
1062 if (super_klass != NULL && super_klass->should_be_initialized()) {
1063 super_klass->initialize(THREAD);
1064 }
1065 // If C implements any interface that declares a non-static, concrete method,
1066 // the initialization of C triggers initialization of its super interfaces.
1067 // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and
1068 // having a superinterface that declares, non-static, concrete methods
1069 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) {
1070 initialize_super_interfaces(THREAD);
1071 }
1072
1073 // If any exceptions, complete abruptly, throwing the same exception as above.
1074 if (HAS_PENDING_EXCEPTION) {
1075 Handle e(THREAD, PENDING_EXCEPTION);
1076 CLEAR_PENDING_EXCEPTION;
1077 {
1078 EXCEPTION_MARK;
1079 // Locks object, set state, and notify all waiting threads
1080 set_initialization_state_and_notify(initialization_error, THREAD);
1081 CLEAR_PENDING_EXCEPTION;
1082 }
1083 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait);
1084 THROW_OOP(e());
1085 }
1086 }
1087
1088
1089 // Look for aot compiled methods for this klass, including class initializer.
1090 AOTLoader::load_for_klass(this, THREAD);
1091
1092 // Step 8
1093 {
1094 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
1095 // Timer includes any side effects of class initialization (resolution,
1096 // etc), but not recursive entry into call_class_initializer().
1097 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
1098 ClassLoader::perf_class_init_selftime(),
1099 ClassLoader::perf_classes_inited(),
1100 jt->get_thread_stat()->perf_recursion_counts_addr(),
1101 jt->get_thread_stat()->perf_timers_addr(),
1102 PerfClassTraceTime::CLASS_CLINIT);
1103 call_class_initializer(THREAD);
1104 }
1105
1106 // Step 9
1107 if (!HAS_PENDING_EXCEPTION) {
1108 set_initialization_state_and_notify(fully_initialized, CHECK);
1109 {
1110 debug_only(vtable().verify(tty, true);)
1111 }
1112 }
1113 else {
1114 // Step 10 and 11
1115 Handle e(THREAD, PENDING_EXCEPTION);
1116 CLEAR_PENDING_EXCEPTION;
1117 // JVMTI has already reported the pending exception
1118 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1119 JvmtiExport::clear_detected_exception(jt);
1120 {
1121 EXCEPTION_MARK;
1122 set_initialization_state_and_notify(initialization_error, THREAD);
1123 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below
1124 // JVMTI has already reported the pending exception
1125 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1126 JvmtiExport::clear_detected_exception(jt);
1127 }
1128 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
1129 if (e->is_a(SystemDictionary::Error_klass())) {
1130 THROW_OOP(e());
1131 } else {
1132 JavaCallArguments args(e);
1133 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
1134 vmSymbols::throwable_void_signature(),
1135 &args);
1136 }
1137 }
1138 DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait);
1139 }
1140
1141
1142 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) {
1143 Handle h_init_lock(THREAD, init_lock());
1144 if (h_init_lock() != NULL) {
1145 ObjectLocker ol(h_init_lock, THREAD);
1146 set_init_thread(NULL); // reset _init_thread before changing _init_state
1147 set_init_state(state);
1148 fence_and_clear_init_lock();
1149 ol.notify_all(CHECK);
1150 } else {
1151 assert(h_init_lock() != NULL, "The initialization state should never be set twice");
1152 set_init_thread(NULL); // reset _init_thread before changing _init_state
1153 set_init_state(state);
1154 }
1155 }
1156
1157 Klass* InstanceKlass::implementor() const {
1158 Klass* volatile* k = adr_implementor();
1159 if (k == NULL) {
1160 return NULL;
1161 } else {
1162 // This load races with inserts, and therefore needs acquire.
1163 Klass* kls = Atomic::load_acquire(k);
1164 if (kls != NULL && !kls->is_loader_alive()) {
1165 return NULL; // don't return unloaded class
1166 } else {
1167 return kls;
1168 }
1169 }
1170 }
1171
1172
1173 void InstanceKlass::set_implementor(Klass* k) {
1174 assert_locked_or_safepoint(Compile_lock);
1175 assert(is_interface(), "not interface");
1176 Klass* volatile* addr = adr_implementor();
1177 assert(addr != NULL, "null addr");
1178 if (addr != NULL) {
1179 Atomic::release_store(addr, k);
1180 }
1181 }
1182
1183 int InstanceKlass::nof_implementors() const {
1184 Klass* k = implementor();
1185 if (k == NULL) {
1186 return 0;
1187 } else if (k != this) {
1188 return 1;
1189 } else {
1190 return 2;
1191 }
1192 }
1193
1194 // The embedded _implementor field can only record one implementor.
1195 // When there are more than one implementors, the _implementor field
1196 // is set to the interface Klass* itself. Following are the possible
1197 // values for the _implementor field:
1198 // NULL - no implementor
1199 // implementor Klass* - one implementor
1200 // self - more than one implementor
1201 //
1202 // The _implementor field only exists for interfaces.
1203 void InstanceKlass::add_implementor(Klass* k) {
1204 if (Universe::is_fully_initialized()) {
1205 assert_lock_strong(Compile_lock);
1206 }
1207 assert(is_interface(), "not interface");
1208 // Filter out my subinterfaces.
1209 // (Note: Interfaces are never on the subklass list.)
1210 if (InstanceKlass::cast(k)->is_interface()) return;
1211
1212 // Filter out subclasses whose supers already implement me.
1213 // (Note: CHA must walk subclasses of direct implementors
1214 // in order to locate indirect implementors.)
1215 Klass* sk = k->super();
1216 if (sk != NULL && InstanceKlass::cast(sk)->implements_interface(this))
1217 // We only need to check one immediate superclass, since the
1218 // implements_interface query looks at transitive_interfaces.
1219 // Any supers of the super have the same (or fewer) transitive_interfaces.
1220 return;
1221
1222 Klass* ik = implementor();
1223 if (ik == NULL) {
1224 set_implementor(k);
1225 } else if (ik != this && ik != k) {
1226 // There is already an implementor. Use itself as an indicator of
1227 // more than one implementors.
1228 set_implementor(this);
1229 }
1230
1231 // The implementor also implements the transitive_interfaces
1232 for (int index = 0; index < local_interfaces()->length(); index++) {
1233 InstanceKlass::cast(local_interfaces()->at(index))->add_implementor(k);
1234 }
1235 }
1236
1237 void InstanceKlass::init_implementor() {
1238 if (is_interface()) {
1239 set_implementor(NULL);
1240 }
1241 }
1242
1243
1244 void InstanceKlass::process_interfaces(Thread *thread) {
1245 // link this class into the implementors list of every interface it implements
1246 for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
1247 assert(local_interfaces()->at(i)->is_klass(), "must be a klass");
1248 InstanceKlass* interf = InstanceKlass::cast(local_interfaces()->at(i));
1249 assert(interf->is_interface(), "expected interface");
1250 interf->add_implementor(this);
1251 }
1252 }
1253
1254 bool InstanceKlass::can_be_primary_super_slow() const {
1255 if (is_interface())
1256 return false;
1257 else
1258 return Klass::can_be_primary_super_slow();
1259 }
1260
1261 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots,
1262 Array<InstanceKlass*>* transitive_interfaces) {
1263 // The secondaries are the implemented interfaces.
1264 Array<InstanceKlass*>* interfaces = transitive_interfaces;
1265 int num_secondaries = num_extra_slots + interfaces->length();
1266 if (num_secondaries == 0) {
1267 // Must share this for correct bootstrapping!
1268 set_secondary_supers(Universe::the_empty_klass_array());
1269 return NULL;
1270 } else if (num_extra_slots == 0) {
1271 // The secondary super list is exactly the same as the transitive interfaces, so
1272 // let's use it instead of making a copy.
1273 // Redefine classes has to be careful not to delete this!
1274 // We need the cast because Array<Klass*> is NOT a supertype of Array<InstanceKlass*>,
1275 // (but it's safe to do here because we won't write into _secondary_supers from this point on).
1276 set_secondary_supers((Array<Klass*>*)(address)interfaces);
1277 return NULL;
1278 } else {
1279 // Copy transitive interfaces to a temporary growable array to be constructed
1280 // into the secondary super list with extra slots.
1281 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length());
1282 for (int i = 0; i < interfaces->length(); i++) {
1283 secondaries->push(interfaces->at(i));
1284 }
1285 return secondaries;
1286 }
1287 }
1288
1289 bool InstanceKlass::implements_interface(Klass* k) const {
1290 if (this == k) return true;
1291 assert(k->is_interface(), "should be an interface class");
1292 for (int i = 0; i < transitive_interfaces()->length(); i++) {
1293 if (transitive_interfaces()->at(i) == k) {
1294 return true;
1295 }
1296 }
1297 return false;
1298 }
1299
1300 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const {
1301 // Verify direct super interface
1302 if (this == k) return true;
1303 assert(k->is_interface(), "should be an interface class");
1304 for (int i = 0; i < local_interfaces()->length(); i++) {
1305 if (local_interfaces()->at(i) == k) {
1306 return true;
1307 }
1308 }
1309 return false;
1310 }
1311
1312 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) {
1313 check_array_allocation_length(length, arrayOopDesc::max_array_length(T_OBJECT), CHECK_NULL);
1314 int size = objArrayOopDesc::object_size(length);
1315 Klass* ak = array_klass(n, CHECK_NULL);
1316 objArrayOop o = (objArrayOop)Universe::heap()->array_allocate(ak, size, length,
1317 /* do_zero */ true, CHECK_NULL);
1318 return o;
1319 }
1320
1321 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
1322 if (TraceFinalizerRegistration) {
1323 tty->print("Registered ");
1324 i->print_value_on(tty);
1325 tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", p2i(i));
1326 }
1327 instanceHandle h_i(THREAD, i);
1328 // Pass the handle as argument, JavaCalls::call expects oop as jobjects
1329 JavaValue result(T_VOID);
1330 JavaCallArguments args(h_i);
1331 methodHandle mh (THREAD, Universe::finalizer_register_method());
1332 JavaCalls::call(&result, mh, &args, CHECK_NULL);
1333 return h_i();
1334 }
1335
1336 instanceOop InstanceKlass::allocate_instance(TRAPS) {
1337 bool has_finalizer_flag = has_finalizer(); // Query before possible GC
1338 int size = size_helper(); // Query before forming handle.
1339
1340 instanceOop i;
1341
1342 i = (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL);
1343 if (has_finalizer_flag && !RegisterFinalizersAtInit) {
1344 i = register_finalizer(i, CHECK_NULL);
1345 }
1346 return i;
1347 }
1348
1349 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) {
1350 return instanceHandle(THREAD, allocate_instance(THREAD));
1351 }
1352
1353 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1354 if (is_interface() || is_abstract()) {
1355 ResourceMark rm(THREAD);
1356 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1357 : vmSymbols::java_lang_InstantiationException(), external_name());
1358 }
1359 if (this == SystemDictionary::Class_klass()) {
1360 ResourceMark rm(THREAD);
1361 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1362 : vmSymbols::java_lang_IllegalAccessException(), external_name());
1363 }
1364 }
1365
1366 Klass* InstanceKlass::array_klass_impl(bool or_null, int n, TRAPS) {
1367 // Need load-acquire for lock-free read
1368 if (array_klasses_acquire() == NULL) {
1369 if (or_null) return NULL;
1370
1371 ResourceMark rm(THREAD);
1372 JavaThread *jt = (JavaThread *)THREAD;
1373 {
1374 // Atomic creation of array_klasses
1375 MutexLocker ma(THREAD, MultiArray_lock);
1376
1377 // Check if update has already taken place
1378 if (array_klasses() == NULL) {
1379 ObjArrayKlass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this, CHECK_NULL);
1380 // use 'release' to pair with lock-free load
1381 release_set_array_klasses(k);
1382 }
1383 }
1384 }
1385 // _this will always be set at this point
1386 ObjArrayKlass* oak = array_klasses();
1387 if (or_null) {
1388 return oak->array_klass_or_null(n);
1389 }
1390 return oak->array_klass(n, THREAD);
1391 }
1392
1393 Klass* InstanceKlass::array_klass_impl(bool or_null, TRAPS) {
1394 return array_klass_impl(or_null, 1, THREAD);
1395 }
1396
1397 static int call_class_initializer_counter = 0; // for debugging
1398
1399 Method* InstanceKlass::class_initializer() const {
1400 Method* clinit = find_method(
1401 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1402 if (clinit != NULL && clinit->has_valid_initializer_flags()) {
1403 return clinit;
1404 }
1405 return NULL;
1406 }
1407
1408 void InstanceKlass::call_class_initializer(TRAPS) {
1409 if (ReplayCompiles &&
1410 (ReplaySuppressInitializers == 1 ||
1411 (ReplaySuppressInitializers >= 2 && class_loader() != NULL))) {
1412 // Hide the existence of the initializer for the purpose of replaying the compile
1413 return;
1414 }
1415
1416 methodHandle h_method(THREAD, class_initializer());
1417 assert(!is_initialized(), "we cannot initialize twice");
1418 LogTarget(Info, class, init) lt;
1419 if (lt.is_enabled()) {
1420 ResourceMark rm(THREAD);
1421 LogStream ls(lt);
1422 ls.print("%d Initializing ", call_class_initializer_counter++);
1423 name()->print_value_on(&ls);
1424 ls.print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", p2i(this));
1425 }
1426 if (h_method() != NULL) {
1427 JavaCallArguments args; // No arguments
1428 JavaValue result(T_VOID);
1429 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1430 }
1431 }
1432
1433
1434 void InstanceKlass::mask_for(const methodHandle& method, int bci,
1435 InterpreterOopMap* entry_for) {
1436 // Lazily create the _oop_map_cache at first request
1437 // Lock-free access requires load_acquire.
1438 OopMapCache* oop_map_cache = Atomic::load_acquire(&_oop_map_cache);
1439 if (oop_map_cache == NULL) {
1440 MutexLocker x(OopMapCacheAlloc_lock);
1441 // Check if _oop_map_cache was allocated while we were waiting for this lock
1442 if ((oop_map_cache = _oop_map_cache) == NULL) {
1443 oop_map_cache = new OopMapCache();
1444 // Ensure _oop_map_cache is stable, since it is examined without a lock
1445 Atomic::release_store(&_oop_map_cache, oop_map_cache);
1446 }
1447 }
1448 // _oop_map_cache is constant after init; lookup below does its own locking.
1449 oop_map_cache->lookup(method, bci, entry_for);
1450 }
1451
1452 bool InstanceKlass::contains_field_offset(int offset) {
1453 fieldDescriptor fd;
1454 return find_field_from_offset(offset, false, &fd);
1455 }
1456
1457 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1458 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1459 Symbol* f_name = fs.name();
1460 Symbol* f_sig = fs.signature();
1461 if (f_name == name && f_sig == sig) {
1462 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1463 return true;
1464 }
1465 }
1466 return false;
1467 }
1468
1469
1470 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1471 const int n = local_interfaces()->length();
1472 for (int i = 0; i < n; i++) {
1473 Klass* intf1 = local_interfaces()->at(i);
1474 assert(intf1->is_interface(), "just checking type");
1475 // search for field in current interface
1476 if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) {
1477 assert(fd->is_static(), "interface field must be static");
1478 return intf1;
1479 }
1480 // search for field in direct superinterfaces
1481 Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd);
1482 if (intf2 != NULL) return intf2;
1483 }
1484 // otherwise field lookup fails
1485 return NULL;
1486 }
1487
1488
1489 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1490 // search order according to newest JVM spec (5.4.3.2, p.167).
1491 // 1) search for field in current klass
1492 if (find_local_field(name, sig, fd)) {
1493 return const_cast<InstanceKlass*>(this);
1494 }
1495 // 2) search for field recursively in direct superinterfaces
1496 { Klass* intf = find_interface_field(name, sig, fd);
1497 if (intf != NULL) return intf;
1498 }
1499 // 3) apply field lookup recursively if superclass exists
1500 { Klass* supr = super();
1501 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, fd);
1502 }
1503 // 4) otherwise field lookup fails
1504 return NULL;
1505 }
1506
1507
1508 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
1509 // search order according to newest JVM spec (5.4.3.2, p.167).
1510 // 1) search for field in current klass
1511 if (find_local_field(name, sig, fd)) {
1512 if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
1513 }
1514 // 2) search for field recursively in direct superinterfaces
1515 if (is_static) {
1516 Klass* intf = find_interface_field(name, sig, fd);
1517 if (intf != NULL) return intf;
1518 }
1519 // 3) apply field lookup recursively if superclass exists
1520 { Klass* supr = super();
1521 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd);
1522 }
1523 // 4) otherwise field lookup fails
1524 return NULL;
1525 }
1526
1527
1528 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1529 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1530 if (fs.offset() == offset) {
1531 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1532 if (fd->is_static() == is_static) return true;
1533 }
1534 }
1535 return false;
1536 }
1537
1538
1539 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1540 Klass* klass = const_cast<InstanceKlass*>(this);
1541 while (klass != NULL) {
1542 if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) {
1543 return true;
1544 }
1545 klass = klass->super();
1546 }
1547 return false;
1548 }
1549
1550
1551 void InstanceKlass::methods_do(void f(Method* method)) {
1552 // Methods aren't stable until they are loaded. This can be read outside
1553 // a lock through the ClassLoaderData for profiling
1554 if (!is_loaded()) {
1555 return;
1556 }
1557
1558 int len = methods()->length();
1559 for (int index = 0; index < len; index++) {
1560 Method* m = methods()->at(index);
1561 assert(m->is_method(), "must be method");
1562 f(m);
1563 }
1564 }
1565
1566
1567 void InstanceKlass::do_local_static_fields(FieldClosure* cl) {
1568 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1569 if (fs.access_flags().is_static()) {
1570 fieldDescriptor& fd = fs.field_descriptor();
1571 cl->do_field(&fd);
1572 }
1573 }
1574 }
1575
1576
1577 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) {
1578 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1579 if (fs.access_flags().is_static()) {
1580 fieldDescriptor& fd = fs.field_descriptor();
1581 f(&fd, mirror, CHECK);
1582 }
1583 }
1584 }
1585
1586
1587 static int compare_fields_by_offset(int* a, int* b) {
1588 return a[0] - b[0];
1589 }
1590
1591 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) {
1592 InstanceKlass* super = superklass();
1593 if (super != NULL) {
1594 super->do_nonstatic_fields(cl);
1595 }
1596 fieldDescriptor fd;
1597 int length = java_fields_count();
1598 // In DebugInfo nonstatic fields are sorted by offset.
1599 int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1), mtClass);
1600 int j = 0;
1601 for (int i = 0; i < length; i += 1) {
1602 fd.reinitialize(this, i);
1603 if (!fd.is_static()) {
1604 fields_sorted[j + 0] = fd.offset();
1605 fields_sorted[j + 1] = i;
1606 j += 2;
1607 }
1608 }
1609 if (j > 0) {
1610 length = j;
1611 // _sort_Fn is defined in growableArray.hpp.
1612 qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset);
1613 for (int i = 0; i < length; i += 2) {
1614 fd.reinitialize(this, fields_sorted[i + 1]);
1615 assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields");
1616 cl->do_field(&fd);
1617 }
1618 }
1619 FREE_C_HEAP_ARRAY(int, fields_sorted);
1620 }
1621
1622
1623 void InstanceKlass::array_klasses_do(void f(Klass* k, TRAPS), TRAPS) {
1624 if (array_klasses() != NULL)
1625 array_klasses()->array_klasses_do(f, THREAD);
1626 }
1627
1628 void InstanceKlass::array_klasses_do(void f(Klass* k)) {
1629 if (array_klasses() != NULL)
1630 array_klasses()->array_klasses_do(f);
1631 }
1632
1633 #ifdef ASSERT
1634 static int linear_search(const Array<Method*>* methods,
1635 const Symbol* name,
1636 const Symbol* signature) {
1637 const int len = methods->length();
1638 for (int index = 0; index < len; index++) {
1639 const Method* const m = methods->at(index);
1640 assert(m->is_method(), "must be method");
1641 if (m->signature() == signature && m->name() == name) {
1642 return index;
1643 }
1644 }
1645 return -1;
1646 }
1647 #endif
1648
1649 bool InstanceKlass::_disable_method_binary_search = false;
1650
1651 NOINLINE int linear_search(const Array<Method*>* methods, const Symbol* name) {
1652 int len = methods->length();
1653 int l = 0;
1654 int h = len - 1;
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 inline int InstanceKlass::quick_search(const Array<Method*>* methods, const Symbol* name) {
1666 if (_disable_method_binary_search) {
1667 assert(DynamicDumpSharedSpaces, "must be");
1668 // At the final stage of dynamic dumping, the methods array may not be sorted
1669 // by ascending addresses of their names, so we can't use binary search anymore.
1670 // However, methods with the same name are still laid out consecutively inside the
1671 // methods array, so let's look for the first one that matches.
1672 return linear_search(methods, name);
1673 }
1674
1675 int len = methods->length();
1676 int l = 0;
1677 int h = len - 1;
1678
1679 // methods are sorted by ascending addresses of their names, so do binary search
1680 while (l <= h) {
1681 int mid = (l + h) >> 1;
1682 Method* m = methods->at(mid);
1683 assert(m->is_method(), "must be method");
1684 int res = m->name()->fast_compare(name);
1685 if (res == 0) {
1686 return mid;
1687 } else if (res < 0) {
1688 l = mid + 1;
1689 } else {
1690 h = mid - 1;
1691 }
1692 }
1693 return -1;
1694 }
1695
1696 // find_method looks up the name/signature in the local methods array
1697 Method* InstanceKlass::find_method(const Symbol* name,
1698 const Symbol* signature) const {
1699 return find_method_impl(name, signature, find_overpass, find_static, find_private);
1700 }
1701
1702 Method* InstanceKlass::find_method_impl(const Symbol* name,
1703 const Symbol* signature,
1704 OverpassLookupMode overpass_mode,
1705 StaticLookupMode static_mode,
1706 PrivateLookupMode private_mode) const {
1707 return InstanceKlass::find_method_impl(methods(),
1708 name,
1709 signature,
1710 overpass_mode,
1711 static_mode,
1712 private_mode);
1713 }
1714
1715 // find_instance_method looks up the name/signature in the local methods array
1716 // and skips over static methods
1717 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods,
1718 const Symbol* name,
1719 const Symbol* signature,
1720 PrivateLookupMode private_mode) {
1721 Method* const meth = InstanceKlass::find_method_impl(methods,
1722 name,
1723 signature,
1724 find_overpass,
1725 skip_static,
1726 private_mode);
1727 assert(((meth == NULL) || !meth->is_static()),
1728 "find_instance_method should have skipped statics");
1729 return meth;
1730 }
1731
1732 // find_instance_method looks up the name/signature in the local methods array
1733 // and skips over static methods
1734 Method* InstanceKlass::find_instance_method(const Symbol* name,
1735 const Symbol* signature,
1736 PrivateLookupMode private_mode) const {
1737 return InstanceKlass::find_instance_method(methods(), name, signature, private_mode);
1738 }
1739
1740 // Find looks up the name/signature in the local methods array
1741 // and filters on the overpass, static and private flags
1742 // This returns the first one found
1743 // note that the local methods array can have up to one overpass, one static
1744 // and one instance (private or not) with the same name/signature
1745 Method* InstanceKlass::find_local_method(const Symbol* name,
1746 const Symbol* signature,
1747 OverpassLookupMode overpass_mode,
1748 StaticLookupMode static_mode,
1749 PrivateLookupMode private_mode) const {
1750 return InstanceKlass::find_method_impl(methods(),
1751 name,
1752 signature,
1753 overpass_mode,
1754 static_mode,
1755 private_mode);
1756 }
1757
1758 // Find looks up the name/signature in the local methods array
1759 // and filters on the overpass, static and private flags
1760 // This returns the first one found
1761 // note that the local methods array can have up to one overpass, one static
1762 // and one instance (private or not) with the same name/signature
1763 Method* InstanceKlass::find_local_method(const Array<Method*>* methods,
1764 const Symbol* name,
1765 const Symbol* signature,
1766 OverpassLookupMode overpass_mode,
1767 StaticLookupMode static_mode,
1768 PrivateLookupMode private_mode) {
1769 return InstanceKlass::find_method_impl(methods,
1770 name,
1771 signature,
1772 overpass_mode,
1773 static_mode,
1774 private_mode);
1775 }
1776
1777 Method* InstanceKlass::find_method(const Array<Method*>* methods,
1778 const Symbol* name,
1779 const Symbol* signature) {
1780 return InstanceKlass::find_method_impl(methods,
1781 name,
1782 signature,
1783 find_overpass,
1784 find_static,
1785 find_private);
1786 }
1787
1788 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods,
1789 const Symbol* name,
1790 const Symbol* signature,
1791 OverpassLookupMode overpass_mode,
1792 StaticLookupMode static_mode,
1793 PrivateLookupMode private_mode) {
1794 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode);
1795 return hit >= 0 ? methods->at(hit): NULL;
1796 }
1797
1798 // true if method matches signature and conforms to skipping_X conditions.
1799 static bool method_matches(const Method* m,
1800 const Symbol* signature,
1801 bool skipping_overpass,
1802 bool skipping_static,
1803 bool skipping_private) {
1804 return ((m->signature() == signature) &&
1805 (!skipping_overpass || !m->is_overpass()) &&
1806 (!skipping_static || !m->is_static()) &&
1807 (!skipping_private || !m->is_private()));
1808 }
1809
1810 // Used directly for default_methods to find the index into the
1811 // default_vtable_indices, and indirectly by find_method
1812 // find_method_index looks in the local methods array to return the index
1813 // of the matching name/signature. If, overpass methods are being ignored,
1814 // the search continues to find a potential non-overpass match. This capability
1815 // is important during method resolution to prefer a static method, for example,
1816 // over an overpass method.
1817 // There is the possibility in any _method's array to have the same name/signature
1818 // for a static method, an overpass method and a local instance method
1819 // To correctly catch a given method, the search criteria may need
1820 // to explicitly skip the other two. For local instance methods, it
1821 // is often necessary to skip private methods
1822 int InstanceKlass::find_method_index(const Array<Method*>* methods,
1823 const Symbol* name,
1824 const Symbol* signature,
1825 OverpassLookupMode overpass_mode,
1826 StaticLookupMode static_mode,
1827 PrivateLookupMode private_mode) {
1828 const bool skipping_overpass = (overpass_mode == skip_overpass);
1829 const bool skipping_static = (static_mode == skip_static);
1830 const bool skipping_private = (private_mode == skip_private);
1831 const int hit = quick_search(methods, name);
1832 if (hit != -1) {
1833 const Method* const m = methods->at(hit);
1834
1835 // Do linear search to find matching signature. First, quick check
1836 // for common case, ignoring overpasses if requested.
1837 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1838 return hit;
1839 }
1840
1841 // search downwards through overloaded methods
1842 int i;
1843 for (i = hit - 1; i >= 0; --i) {
1844 const Method* const m = methods->at(i);
1845 assert(m->is_method(), "must be method");
1846 if (m->name() != name) {
1847 break;
1848 }
1849 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1850 return i;
1851 }
1852 }
1853 // search upwards
1854 for (i = hit + 1; i < methods->length(); ++i) {
1855 const Method* const m = methods->at(i);
1856 assert(m->is_method(), "must be method");
1857 if (m->name() != name) {
1858 break;
1859 }
1860 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1861 return i;
1862 }
1863 }
1864 // not found
1865 #ifdef ASSERT
1866 const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 :
1867 linear_search(methods, name, signature);
1868 assert(-1 == index, "binary search should have found entry %d", index);
1869 #endif
1870 }
1871 return -1;
1872 }
1873
1874 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const {
1875 return find_method_by_name(methods(), name, end);
1876 }
1877
1878 int InstanceKlass::find_method_by_name(const Array<Method*>* methods,
1879 const Symbol* name,
1880 int* end_ptr) {
1881 assert(end_ptr != NULL, "just checking");
1882 int start = quick_search(methods, name);
1883 int end = start + 1;
1884 if (start != -1) {
1885 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
1886 while (end < methods->length() && (methods->at(end))->name() == name) ++end;
1887 *end_ptr = end;
1888 return start;
1889 }
1890 return -1;
1891 }
1892
1893 // uncached_lookup_method searches both the local class methods array and all
1894 // superclasses methods arrays, skipping any overpass methods in superclasses,
1895 // and possibly skipping private methods.
1896 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
1897 const Symbol* signature,
1898 OverpassLookupMode overpass_mode,
1899 PrivateLookupMode private_mode) const {
1900 OverpassLookupMode overpass_local_mode = overpass_mode;
1901 const Klass* klass = this;
1902 while (klass != NULL) {
1903 Method* const method = InstanceKlass::cast(klass)->find_method_impl(name,
1904 signature,
1905 overpass_local_mode,
1906 find_static,
1907 private_mode);
1908 if (method != NULL) {
1909 return method;
1910 }
1911 klass = klass->super();
1912 overpass_local_mode = skip_overpass; // Always ignore overpass methods in superclasses
1913 }
1914 return NULL;
1915 }
1916
1917 #ifdef ASSERT
1918 // search through class hierarchy and return true if this class or
1919 // one of the superclasses was redefined
1920 bool InstanceKlass::has_redefined_this_or_super() const {
1921 const Klass* klass = this;
1922 while (klass != NULL) {
1923 if (InstanceKlass::cast(klass)->has_been_redefined()) {
1924 return true;
1925 }
1926 klass = klass->super();
1927 }
1928 return false;
1929 }
1930 #endif
1931
1932 // lookup a method in the default methods list then in all transitive interfaces
1933 // Do NOT return private or static methods
1934 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
1935 Symbol* signature) const {
1936 Method* m = NULL;
1937 if (default_methods() != NULL) {
1938 m = find_method(default_methods(), name, signature);
1939 }
1940 // Look up interfaces
1941 if (m == NULL) {
1942 m = lookup_method_in_all_interfaces(name, signature, find_defaults);
1943 }
1944 return m;
1945 }
1946
1947 // lookup a method in all the interfaces that this class implements
1948 // Do NOT return private or static methods, new in JDK8 which are not externally visible
1949 // They should only be found in the initial InterfaceMethodRef
1950 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
1951 Symbol* signature,
1952 DefaultsLookupMode defaults_mode) const {
1953 Array<InstanceKlass*>* all_ifs = transitive_interfaces();
1954 int num_ifs = all_ifs->length();
1955 InstanceKlass *ik = NULL;
1956 for (int i = 0; i < num_ifs; i++) {
1957 ik = all_ifs->at(i);
1958 Method* m = ik->lookup_method(name, signature);
1959 if (m != NULL && m->is_public() && !m->is_static() &&
1960 ((defaults_mode != skip_defaults) || !m->is_default_method())) {
1961 return m;
1962 }
1963 }
1964 return NULL;
1965 }
1966
1967 /* jni_id_for_impl for jfieldIds only */
1968 JNIid* InstanceKlass::jni_id_for_impl(int offset) {
1969 MutexLocker ml(JfieldIdCreation_lock);
1970 // Retry lookup after we got the lock
1971 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
1972 if (probe == NULL) {
1973 // Slow case, allocate new static field identifier
1974 probe = new JNIid(this, offset, jni_ids());
1975 set_jni_ids(probe);
1976 }
1977 return probe;
1978 }
1979
1980
1981 /* jni_id_for for jfieldIds only */
1982 JNIid* InstanceKlass::jni_id_for(int offset) {
1983 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
1984 if (probe == NULL) {
1985 probe = jni_id_for_impl(offset);
1986 }
1987 return probe;
1988 }
1989
1990 u2 InstanceKlass::enclosing_method_data(int offset) const {
1991 const Array<jushort>* const inner_class_list = inner_classes();
1992 if (inner_class_list == NULL) {
1993 return 0;
1994 }
1995 const int length = inner_class_list->length();
1996 if (length % inner_class_next_offset == 0) {
1997 return 0;
1998 }
1999 const int index = length - enclosing_method_attribute_size;
2000 assert(offset < enclosing_method_attribute_size, "invalid offset");
2001 return inner_class_list->at(index + offset);
2002 }
2003
2004 void InstanceKlass::set_enclosing_method_indices(u2 class_index,
2005 u2 method_index) {
2006 Array<jushort>* inner_class_list = inner_classes();
2007 assert (inner_class_list != NULL, "_inner_classes list is not set up");
2008 int length = inner_class_list->length();
2009 if (length % inner_class_next_offset == enclosing_method_attribute_size) {
2010 int index = length - enclosing_method_attribute_size;
2011 inner_class_list->at_put(
2012 index + enclosing_method_class_index_offset, class_index);
2013 inner_class_list->at_put(
2014 index + enclosing_method_method_index_offset, method_index);
2015 }
2016 }
2017
2018 // Lookup or create a jmethodID.
2019 // This code is called by the VMThread and JavaThreads so the
2020 // locking has to be done very carefully to avoid deadlocks
2021 // and/or other cache consistency problems.
2022 //
2023 jmethodID InstanceKlass::get_jmethod_id(const methodHandle& method_h) {
2024 size_t idnum = (size_t)method_h->method_idnum();
2025 jmethodID* jmeths = methods_jmethod_ids_acquire();
2026 size_t length = 0;
2027 jmethodID id = NULL;
2028
2029 // We use a double-check locking idiom here because this cache is
2030 // performance sensitive. In the normal system, this cache only
2031 // transitions from NULL to non-NULL which is safe because we use
2032 // release_set_methods_jmethod_ids() to advertise the new cache.
2033 // A partially constructed cache should never be seen by a racing
2034 // thread. We also use release_store() to save a new jmethodID
2035 // in the cache so a partially constructed jmethodID should never be
2036 // seen either. Cache reads of existing jmethodIDs proceed without a
2037 // lock, but cache writes of a new jmethodID requires uniqueness and
2038 // creation of the cache itself requires no leaks so a lock is
2039 // generally acquired in those two cases.
2040 //
2041 // If the RedefineClasses() API has been used, then this cache can
2042 // grow and we'll have transitions from non-NULL to bigger non-NULL.
2043 // Cache creation requires no leaks and we require safety between all
2044 // cache accesses and freeing of the old cache so a lock is generally
2045 // acquired when the RedefineClasses() API has been used.
2046
2047 if (jmeths != NULL) {
2048 // the cache already exists
2049 if (!idnum_can_increment()) {
2050 // the cache can't grow so we can just get the current values
2051 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2052 } else {
2053 // cache can grow so we have to be more careful
2054 if (Threads::number_of_threads() == 0 ||
2055 SafepointSynchronize::is_at_safepoint()) {
2056 // we're single threaded or at a safepoint - no locking needed
2057 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2058 } else {
2059 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2060 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2061 }
2062 }
2063 }
2064 // implied else:
2065 // we need to allocate a cache so default length and id values are good
2066
2067 if (jmeths == NULL || // no cache yet
2068 length <= idnum || // cache is too short
2069 id == NULL) { // cache doesn't contain entry
2070
2071 // This function can be called by the VMThread so we have to do all
2072 // things that might block on a safepoint before grabbing the lock.
2073 // Otherwise, we can deadlock with the VMThread or have a cache
2074 // consistency issue. These vars keep track of what we might have
2075 // to free after the lock is dropped.
2076 jmethodID to_dealloc_id = NULL;
2077 jmethodID* to_dealloc_jmeths = NULL;
2078
2079 // may not allocate new_jmeths or use it if we allocate it
2080 jmethodID* new_jmeths = NULL;
2081 if (length <= idnum) {
2082 // allocate a new cache that might be used
2083 size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count());
2084 new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1, mtClass);
2085 memset(new_jmeths, 0, (size+1)*sizeof(jmethodID));
2086 // cache size is stored in element[0], other elements offset by one
2087 new_jmeths[0] = (jmethodID)size;
2088 }
2089
2090 // allocate a new jmethodID that might be used
2091 jmethodID new_id = NULL;
2092 if (method_h->is_old() && !method_h->is_obsolete()) {
2093 // The method passed in is old (but not obsolete), we need to use the current version
2094 Method* current_method = method_with_idnum((int)idnum);
2095 assert(current_method != NULL, "old and but not obsolete, so should exist");
2096 new_id = Method::make_jmethod_id(class_loader_data(), current_method);
2097 } else {
2098 // It is the current version of the method or an obsolete method,
2099 // use the version passed in
2100 new_id = Method::make_jmethod_id(class_loader_data(), method_h());
2101 }
2102
2103 if (Threads::number_of_threads() == 0 ||
2104 SafepointSynchronize::is_at_safepoint()) {
2105 // we're single threaded or at a safepoint - no locking needed
2106 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2107 &to_dealloc_id, &to_dealloc_jmeths);
2108 } else {
2109 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2110 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2111 &to_dealloc_id, &to_dealloc_jmeths);
2112 }
2113
2114 // The lock has been dropped so we can free resources.
2115 // Free up either the old cache or the new cache if we allocated one.
2116 if (to_dealloc_jmeths != NULL) {
2117 FreeHeap(to_dealloc_jmeths);
2118 }
2119 // free up the new ID since it wasn't needed
2120 if (to_dealloc_id != NULL) {
2121 Method::destroy_jmethod_id(class_loader_data(), to_dealloc_id);
2122 }
2123 }
2124 return id;
2125 }
2126
2127 // Figure out how many jmethodIDs haven't been allocated, and make
2128 // sure space for them is pre-allocated. This makes getting all
2129 // method ids much, much faster with classes with more than 8
2130 // methods, and has a *substantial* effect on performance with jvmti
2131 // code that loads all jmethodIDs for all classes.
2132 void InstanceKlass::ensure_space_for_methodids(int start_offset) {
2133 int new_jmeths = 0;
2134 int length = methods()->length();
2135 for (int index = start_offset; index < length; index++) {
2136 Method* m = methods()->at(index);
2137 jmethodID id = m->find_jmethod_id_or_null();
2138 if (id == NULL) {
2139 new_jmeths++;
2140 }
2141 }
2142 if (new_jmeths != 0) {
2143 Method::ensure_jmethod_ids(class_loader_data(), new_jmeths);
2144 }
2145 }
2146
2147 // Common code to fetch the jmethodID from the cache or update the
2148 // cache with the new jmethodID. This function should never do anything
2149 // that causes the caller to go to a safepoint or we can deadlock with
2150 // the VMThread or have cache consistency issues.
2151 //
2152 jmethodID InstanceKlass::get_jmethod_id_fetch_or_update(
2153 size_t idnum, jmethodID new_id,
2154 jmethodID* new_jmeths, jmethodID* to_dealloc_id_p,
2155 jmethodID** to_dealloc_jmeths_p) {
2156 assert(new_id != NULL, "sanity check");
2157 assert(to_dealloc_id_p != NULL, "sanity check");
2158 assert(to_dealloc_jmeths_p != NULL, "sanity check");
2159 assert(Threads::number_of_threads() == 0 ||
2160 SafepointSynchronize::is_at_safepoint() ||
2161 JmethodIdCreation_lock->owned_by_self(), "sanity check");
2162
2163 // reacquire the cache - we are locked, single threaded or at a safepoint
2164 jmethodID* jmeths = methods_jmethod_ids_acquire();
2165 jmethodID id = NULL;
2166 size_t length = 0;
2167
2168 if (jmeths == NULL || // no cache yet
2169 (length = (size_t)jmeths[0]) <= idnum) { // cache is too short
2170 if (jmeths != NULL) {
2171 // copy any existing entries from the old cache
2172 for (size_t index = 0; index < length; index++) {
2173 new_jmeths[index+1] = jmeths[index+1];
2174 }
2175 *to_dealloc_jmeths_p = jmeths; // save old cache for later delete
2176 }
2177 release_set_methods_jmethod_ids(jmeths = new_jmeths);
2178 } else {
2179 // fetch jmethodID (if any) from the existing cache
2180 id = jmeths[idnum+1];
2181 *to_dealloc_jmeths_p = new_jmeths; // save new cache for later delete
2182 }
2183 if (id == NULL) {
2184 // No matching jmethodID in the existing cache or we have a new
2185 // cache or we just grew the cache. This cache write is done here
2186 // by the first thread to win the foot race because a jmethodID
2187 // needs to be unique once it is generally available.
2188 id = new_id;
2189
2190 // The jmethodID cache can be read while unlocked so we have to
2191 // make sure the new jmethodID is complete before installing it
2192 // in the cache.
2193 Atomic::release_store(&jmeths[idnum+1], id);
2194 } else {
2195 *to_dealloc_id_p = new_id; // save new id for later delete
2196 }
2197 return id;
2198 }
2199
2200
2201 // Common code to get the jmethodID cache length and the jmethodID
2202 // value at index idnum if there is one.
2203 //
2204 void InstanceKlass::get_jmethod_id_length_value(jmethodID* cache,
2205 size_t idnum, size_t *length_p, jmethodID* id_p) {
2206 assert(cache != NULL, "sanity check");
2207 assert(length_p != NULL, "sanity check");
2208 assert(id_p != NULL, "sanity check");
2209
2210 // cache size is stored in element[0], other elements offset by one
2211 *length_p = (size_t)cache[0];
2212 if (*length_p <= idnum) { // cache is too short
2213 *id_p = NULL;
2214 } else {
2215 *id_p = cache[idnum+1]; // fetch jmethodID (if any)
2216 }
2217 }
2218
2219
2220 // Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles
2221 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
2222 size_t idnum = (size_t)method->method_idnum();
2223 jmethodID* jmeths = methods_jmethod_ids_acquire();
2224 size_t length; // length assigned as debugging crumb
2225 jmethodID id = NULL;
2226 if (jmeths != NULL && // If there is a cache
2227 (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough,
2228 id = jmeths[idnum+1]; // Look up the id (may be NULL)
2229 }
2230 return id;
2231 }
2232
2233 inline DependencyContext InstanceKlass::dependencies() {
2234 DependencyContext dep_context(&_dep_context, &_dep_context_last_cleaned);
2235 return dep_context;
2236 }
2237
2238 int InstanceKlass::mark_dependent_nmethods(KlassDepChange& changes) {
2239 return dependencies().mark_dependent_nmethods(changes);
2240 }
2241
2242 void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
2243 dependencies().add_dependent_nmethod(nm);
2244 }
2245
2246 void InstanceKlass::remove_dependent_nmethod(nmethod* nm) {
2247 dependencies().remove_dependent_nmethod(nm);
2248 }
2249
2250 void InstanceKlass::clean_dependency_context() {
2251 dependencies().clean_unloading_dependents();
2252 }
2253
2254 #ifndef PRODUCT
2255 void InstanceKlass::print_dependent_nmethods(bool verbose) {
2256 dependencies().print_dependent_nmethods(verbose);
2257 }
2258
2259 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
2260 return dependencies().is_dependent_nmethod(nm);
2261 }
2262 #endif //PRODUCT
2263
2264 void InstanceKlass::clean_weak_instanceklass_links() {
2265 clean_implementors_list();
2266 clean_method_data();
2267 }
2268
2269 void InstanceKlass::clean_implementors_list() {
2270 assert(is_loader_alive(), "this klass should be live");
2271 if (is_interface()) {
2272 assert (ClassUnloading, "only called for ClassUnloading");
2273 for (;;) {
2274 // Use load_acquire due to competing with inserts
2275 Klass* impl = Atomic::load_acquire(adr_implementor());
2276 if (impl != NULL && !impl->is_loader_alive()) {
2277 // NULL this field, might be an unloaded klass or NULL
2278 Klass* volatile* klass = adr_implementor();
2279 if (Atomic::cmpxchg(klass, impl, (Klass*)NULL) == impl) {
2280 // Successfully unlinking implementor.
2281 if (log_is_enabled(Trace, class, unload)) {
2282 ResourceMark rm;
2283 log_trace(class, unload)("unlinking class (implementor): %s", impl->external_name());
2284 }
2285 return;
2286 }
2287 } else {
2288 return;
2289 }
2290 }
2291 }
2292 }
2293
2294 void InstanceKlass::clean_method_data() {
2295 for (int m = 0; m < methods()->length(); m++) {
2296 MethodData* mdo = methods()->at(m)->method_data();
2297 if (mdo != NULL) {
2298 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : mdo->extra_data_lock());
2299 mdo->clean_method_data(/*always_clean*/false);
2300 }
2301 }
2302 }
2303
2304 bool InstanceKlass::supers_have_passed_fingerprint_checks() {
2305 if (java_super() != NULL && !java_super()->has_passed_fingerprint_check()) {
2306 ResourceMark rm;
2307 log_trace(class, fingerprint)("%s : super %s not fingerprinted", external_name(), java_super()->external_name());
2308 return false;
2309 }
2310
2311 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
2312 if (local_interfaces != NULL) {
2313 int length = local_interfaces->length();
2314 for (int i = 0; i < length; i++) {
2315 InstanceKlass* intf = local_interfaces->at(i);
2316 if (!intf->has_passed_fingerprint_check()) {
2317 ResourceMark rm;
2318 log_trace(class, fingerprint)("%s : interface %s not fingerprinted", external_name(), intf->external_name());
2319 return false;
2320 }
2321 }
2322 }
2323
2324 return true;
2325 }
2326
2327 bool InstanceKlass::should_store_fingerprint(bool is_hidden_or_anonymous) {
2328 #if INCLUDE_AOT
2329 // We store the fingerprint into the InstanceKlass only in the following 2 cases:
2330 if (CalculateClassFingerprint) {
2331 // (1) We are running AOT to generate a shared library.
2332 return true;
2333 }
2334 if (Arguments::is_dumping_archive()) {
2335 // (2) We are running -Xshare:dump or -XX:ArchiveClassesAtExit to create a shared archive
2336 return true;
2337 }
2338 if (UseAOT && is_hidden_or_anonymous) {
2339 // (3) We are using AOT code from a shared library and see a hidden or unsafe anonymous class
2340 return true;
2341 }
2342 #endif
2343
2344 // In all other cases we might set the _misc_has_passed_fingerprint_check bit,
2345 // but do not store the 64-bit fingerprint to save space.
2346 return false;
2347 }
2348
2349 bool InstanceKlass::has_stored_fingerprint() const {
2350 #if INCLUDE_AOT
2351 return should_store_fingerprint() || is_shared();
2352 #else
2353 return false;
2354 #endif
2355 }
2356
2357 uint64_t InstanceKlass::get_stored_fingerprint() const {
2358 address adr = adr_fingerprint();
2359 if (adr != NULL) {
2360 return (uint64_t)Bytes::get_native_u8(adr); // adr may not be 64-bit aligned
2361 }
2362 return 0;
2363 }
2364
2365 void InstanceKlass::store_fingerprint(uint64_t fingerprint) {
2366 address adr = adr_fingerprint();
2367 if (adr != NULL) {
2368 Bytes::put_native_u8(adr, (u8)fingerprint); // adr may not be 64-bit aligned
2369
2370 ResourceMark rm;
2371 log_trace(class, fingerprint)("stored as " PTR64_FORMAT " for class %s", fingerprint, external_name());
2372 }
2373 }
2374
2375 void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) {
2376 Klass::metaspace_pointers_do(it);
2377
2378 if (log_is_enabled(Trace, cds)) {
2379 ResourceMark rm;
2380 log_trace(cds)("Iter(InstanceKlass): %p (%s)", this, external_name());
2381 }
2382
2383 it->push(&_annotations);
2384 it->push((Klass**)&_array_klasses);
2385 it->push(&_constants);
2386 it->push(&_inner_classes);
2387 #if INCLUDE_JVMTI
2388 it->push(&_previous_versions);
2389 #endif
2390 it->push(&_methods);
2391 it->push(&_default_methods);
2392 it->push(&_local_interfaces);
2393 it->push(&_transitive_interfaces);
2394 it->push(&_method_ordering);
2395 it->push(&_default_vtable_indices);
2396 it->push(&_fields);
2397
2398 if (itable_length() > 0) {
2399 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2400 int method_table_offset_in_words = ioe->offset()/wordSize;
2401 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
2402 / itableOffsetEntry::size();
2403
2404 for (int i = 0; i < nof_interfaces; i ++, ioe ++) {
2405 if (ioe->interface_klass() != NULL) {
2406 it->push(ioe->interface_klass_addr());
2407 itableMethodEntry* ime = ioe->first_method_entry(this);
2408 int n = klassItable::method_count_for_interface(ioe->interface_klass());
2409 for (int index = 0; index < n; index ++) {
2410 it->push(ime[index].method_addr());
2411 }
2412 }
2413 }
2414 }
2415
2416 it->push(&_nest_members);
2417 it->push(&_record_components);
2418 }
2419
2420 void InstanceKlass::remove_unshareable_info() {
2421 Klass::remove_unshareable_info();
2422
2423 if (SystemDictionaryShared::has_class_failed_verification(this)) {
2424 // Classes are attempted to link during dumping and may fail,
2425 // but these classes are still in the dictionary and class list in CLD.
2426 // If the class has failed verification, there is nothing else to remove.
2427 return;
2428 }
2429
2430 // Reset to the 'allocated' state to prevent any premature accessing to
2431 // a shared class at runtime while the class is still being loaded and
2432 // restored. A class' init_state is set to 'loaded' at runtime when it's
2433 // being added to class hierarchy (see SystemDictionary:::add_to_hierarchy()).
2434 _init_state = allocated;
2435
2436 { // Otherwise this needs to take out the Compile_lock.
2437 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
2438 init_implementor();
2439 }
2440
2441 constants()->remove_unshareable_info();
2442
2443 for (int i = 0; i < methods()->length(); i++) {
2444 Method* m = methods()->at(i);
2445 m->remove_unshareable_info();
2446 }
2447
2448 // do array classes also.
2449 if (array_klasses() != NULL) {
2450 array_klasses()->remove_unshareable_info();
2451 }
2452
2453 // These are not allocated from metaspace. They are safe to set to NULL.
2454 _source_debug_extension = NULL;
2455 _dep_context = NULL;
2456 _osr_nmethods_head = NULL;
2457 #if INCLUDE_JVMTI
2458 _breakpoints = NULL;
2459 _previous_versions = NULL;
2460 _cached_class_file = NULL;
2461 _jvmti_cached_class_field_map = NULL;
2462 #endif
2463
2464 _init_thread = NULL;
2465 _methods_jmethod_ids = NULL;
2466 _jni_ids = NULL;
2467 _oop_map_cache = NULL;
2468 // clear _nest_host to ensure re-load at runtime
2469 _nest_host = NULL;
2470 _package_entry = NULL;
2471 _dep_context_last_cleaned = 0;
2472 }
2473
2474 void InstanceKlass::remove_java_mirror() {
2475 Klass::remove_java_mirror();
2476
2477 // do array classes also.
2478 if (array_klasses() != NULL) {
2479 array_klasses()->remove_java_mirror();
2480 }
2481 }
2482
2483 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain,
2484 PackageEntry* pkg_entry, TRAPS) {
2485 // SystemDictionary::add_to_hierarchy() sets the init_state to loaded
2486 // before the InstanceKlass is added to the SystemDictionary. Make
2487 // sure the current state is <loaded.
2488 assert(!is_loaded(), "invalid init state");
2489 set_package(loader_data, pkg_entry, CHECK);
2490 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
2491
2492 Array<Method*>* methods = this->methods();
2493 int num_methods = methods->length();
2494 for (int index = 0; index < num_methods; ++index) {
2495 methods->at(index)->restore_unshareable_info(CHECK);
2496 }
2497 if (JvmtiExport::has_redefined_a_class()) {
2498 // Reinitialize vtable because RedefineClasses may have changed some
2499 // entries in this vtable for super classes so the CDS vtable might
2500 // point to old or obsolete entries. RedefineClasses doesn't fix up
2501 // vtables in the shared system dictionary, only the main one.
2502 // It also redefines the itable too so fix that too.
2503 vtable().initialize_vtable(false, CHECK);
2504 itable().initialize_itable(false, CHECK);
2505 }
2506
2507 // restore constant pool resolved references
2508 constants()->restore_unshareable_info(CHECK);
2509
2510 if (array_klasses() != NULL) {
2511 // Array classes have null protection domain.
2512 // --> see ArrayKlass::complete_create_array_klass()
2513 array_klasses()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
2514 }
2515
2516 // Initialize current biased locking state.
2517 if (UseBiasedLocking && BiasedLocking::enabled()) {
2518 set_prototype_header(markWord::biased_locking_prototype());
2519 }
2520 }
2521
2522 void InstanceKlass::set_shared_class_loader_type(s2 loader_type) {
2523 switch (loader_type) {
2524 case ClassLoader::BOOT_LOADER:
2525 _misc_flags |= _misc_is_shared_boot_class;
2526 break;
2527 case ClassLoader::PLATFORM_LOADER:
2528 _misc_flags |= _misc_is_shared_platform_class;
2529 break;
2530 case ClassLoader::APP_LOADER:
2531 _misc_flags |= _misc_is_shared_app_class;
2532 break;
2533 default:
2534 ShouldNotReachHere();
2535 break;
2536 }
2537 }
2538
2539 void InstanceKlass::assign_class_loader_type() {
2540 ClassLoaderData *cld = class_loader_data();
2541 if (cld->is_boot_class_loader_data()) {
2542 set_shared_class_loader_type(ClassLoader::BOOT_LOADER);
2543 }
2544 else if (cld->is_platform_class_loader_data()) {
2545 set_shared_class_loader_type(ClassLoader::PLATFORM_LOADER);
2546 }
2547 else if (cld->is_system_class_loader_data()) {
2548 set_shared_class_loader_type(ClassLoader::APP_LOADER);
2549 }
2550 }
2551
2552 #if INCLUDE_JVMTI
2553 static void clear_all_breakpoints(Method* m) {
2554 m->clear_all_breakpoints();
2555 }
2556 #endif
2557
2558 void InstanceKlass::unload_class(InstanceKlass* ik) {
2559 // Release dependencies.
2560 ik->dependencies().remove_all_dependents();
2561
2562 // notify the debugger
2563 if (JvmtiExport::should_post_class_unload()) {
2564 JvmtiExport::post_class_unload(ik);
2565 }
2566
2567 // notify ClassLoadingService of class unload
2568 ClassLoadingService::notify_class_unloaded(ik);
2569
2570 if (Arguments::is_dumping_archive()) {
2571 SystemDictionaryShared::remove_dumptime_info(ik);
2572 }
2573
2574 if (log_is_enabled(Info, class, unload)) {
2575 ResourceMark rm;
2576 log_info(class, unload)("unloading class %s " INTPTR_FORMAT, ik->external_name(), p2i(ik));
2577 }
2578
2579 Events::log_class_unloading(Thread::current(), ik);
2580
2581 #if INCLUDE_JFR
2582 assert(ik != NULL, "invariant");
2583 EventClassUnload event;
2584 event.set_unloadedClass(ik);
2585 event.set_definingClassLoader(ik->class_loader_data());
2586 event.commit();
2587 #endif
2588 }
2589
2590 static void method_release_C_heap_structures(Method* m) {
2591 m->release_C_heap_structures();
2592 }
2593
2594 void InstanceKlass::release_C_heap_structures() {
2595
2596 // Clean up C heap
2597 release_C_heap_structures_internal();
2598 constants()->release_C_heap_structures();
2599
2600 // Deallocate and call destructors for MDO mutexes
2601 methods_do(method_release_C_heap_structures);
2602 }
2603
2604 void InstanceKlass::release_C_heap_structures_internal() {
2605 Klass::release_C_heap_structures();
2606
2607 // Can't release the constant pool here because the constant pool can be
2608 // deallocated separately from the InstanceKlass for default methods and
2609 // redefine classes.
2610
2611 // Deallocate oop map cache
2612 if (_oop_map_cache != NULL) {
2613 delete _oop_map_cache;
2614 _oop_map_cache = NULL;
2615 }
2616
2617 // Deallocate JNI identifiers for jfieldIDs
2618 JNIid::deallocate(jni_ids());
2619 set_jni_ids(NULL);
2620
2621 jmethodID* jmeths = methods_jmethod_ids_acquire();
2622 if (jmeths != (jmethodID*)NULL) {
2623 release_set_methods_jmethod_ids(NULL);
2624 FreeHeap(jmeths);
2625 }
2626
2627 assert(_dep_context == NULL,
2628 "dependencies should already be cleaned");
2629
2630 #if INCLUDE_JVMTI
2631 // Deallocate breakpoint records
2632 if (breakpoints() != 0x0) {
2633 methods_do(clear_all_breakpoints);
2634 assert(breakpoints() == 0x0, "should have cleared breakpoints");
2635 }
2636
2637 // deallocate the cached class file
2638 if (_cached_class_file != NULL) {
2639 os::free(_cached_class_file);
2640 _cached_class_file = NULL;
2641 }
2642 #endif
2643
2644 FREE_C_HEAP_ARRAY(char, _source_debug_extension);
2645 }
2646
2647 void InstanceKlass::set_source_debug_extension(const char* array, int length) {
2648 if (array == NULL) {
2649 _source_debug_extension = NULL;
2650 } else {
2651 // Adding one to the attribute length in order to store a null terminator
2652 // character could cause an overflow because the attribute length is
2653 // already coded with an u4 in the classfile, but in practice, it's
2654 // unlikely to happen.
2655 assert((length+1) > length, "Overflow checking");
2656 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
2657 for (int i = 0; i < length; i++) {
2658 sde[i] = array[i];
2659 }
2660 sde[length] = '\0';
2661 _source_debug_extension = sde;
2662 }
2663 }
2664
2665 const char* InstanceKlass::signature_name() const {
2666 int hash_len = 0;
2667 char hash_buf[40];
2668
2669 // If this is an unsafe anonymous class, append a hash to make the name unique
2670 if (is_unsafe_anonymous()) {
2671 intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0;
2672 jio_snprintf(hash_buf, sizeof(hash_buf), "/" UINTX_FORMAT, (uintx)hash);
2673 hash_len = (int)strlen(hash_buf);
2674 }
2675
2676 // Get the internal name as a c string
2677 const char* src = (const char*) (name()->as_C_string());
2678 const int src_length = (int)strlen(src);
2679
2680 char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3);
2681
2682 // Add L as type indicator
2683 int dest_index = 0;
2684 dest[dest_index++] = JVM_SIGNATURE_CLASS;
2685
2686 // Add the actual class name
2687 for (int src_index = 0; src_index < src_length; ) {
2688 dest[dest_index++] = src[src_index++];
2689 }
2690
2691 if (is_hidden()) { // Replace the last '+' with a '.'.
2692 for (int index = (int)src_length; index > 0; index--) {
2693 if (dest[index] == '+') {
2694 dest[index] = JVM_SIGNATURE_DOT;
2695 break;
2696 }
2697 }
2698 }
2699
2700 // If we have a hash, append it
2701 for (int hash_index = 0; hash_index < hash_len; ) {
2702 dest[dest_index++] = hash_buf[hash_index++];
2703 }
2704
2705 // Add the semicolon and the NULL
2706 dest[dest_index++] = JVM_SIGNATURE_ENDCLASS;
2707 dest[dest_index] = '\0';
2708 return dest;
2709 }
2710
2711 ModuleEntry* InstanceKlass::module() const {
2712 // For an unsafe anonymous class return the host class' module
2713 if (is_unsafe_anonymous()) {
2714 assert(unsafe_anonymous_host() != NULL, "unsafe anonymous class must have a host class");
2715 return unsafe_anonymous_host()->module();
2716 }
2717
2718 if (is_hidden() &&
2719 in_unnamed_package() &&
2720 class_loader_data()->has_class_mirror_holder()) {
2721 // For a non-strong hidden class defined to an unnamed package,
2722 // its (class held) CLD will not have an unnamed module created for it.
2723 // Two choices to find the correct ModuleEntry:
2724 // 1. If hidden class is within a nest, use nest host's module
2725 // 2. Find the unnamed module off from the class loader
2726 // For now option #2 is used since a nest host is not set until
2727 // after the instance class is created in jvm_lookup_define_class().
2728 if (class_loader_data()->is_boot_class_loader_data()) {
2729 return ClassLoaderData::the_null_class_loader_data()->unnamed_module();
2730 } else {
2731 oop module = java_lang_ClassLoader::unnamedModule(class_loader_data()->class_loader());
2732 assert(java_lang_Module::is_instance(module), "Not an instance of java.lang.Module");
2733 return java_lang_Module::module_entry(module);
2734 }
2735 }
2736
2737 // Class is in a named package
2738 if (!in_unnamed_package()) {
2739 return _package_entry->module();
2740 }
2741
2742 // Class is in an unnamed package, return its loader's unnamed module
2743 return class_loader_data()->unnamed_module();
2744 }
2745
2746 void InstanceKlass::set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS) {
2747
2748 // ensure java/ packages only loaded by boot or platform builtin loaders
2749 // not needed for shared class since CDS does not archive prohibited classes.
2750 if (!is_shared()) {
2751 check_prohibited_package(name(), loader_data, CHECK);
2752 }
2753
2754 TempNewSymbol pkg_name = pkg_entry != NULL ? pkg_entry->name() : ClassLoader::package_from_class_name(name());
2755
2756 if (pkg_name != NULL && loader_data != NULL) {
2757
2758 // Find in class loader's package entry table.
2759 _package_entry = pkg_entry != NULL ? pkg_entry : loader_data->packages()->lookup_only(pkg_name);
2760
2761 // If the package name is not found in the loader's package
2762 // entry table, it is an indication that the package has not
2763 // been defined. Consider it defined within the unnamed module.
2764 if (_package_entry == NULL) {
2765
2766 if (!ModuleEntryTable::javabase_defined()) {
2767 // Before java.base is defined during bootstrapping, define all packages in
2768 // the java.base module. If a non-java.base package is erroneously placed
2769 // in the java.base module it will be caught later when java.base
2770 // is defined by ModuleEntryTable::verify_javabase_packages check.
2771 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, JAVA_BASE_NAME " module is NULL");
2772 _package_entry = loader_data->packages()->lookup(pkg_name, ModuleEntryTable::javabase_moduleEntry());
2773 } else {
2774 assert(loader_data->unnamed_module() != NULL, "unnamed module is NULL");
2775 _package_entry = loader_data->packages()->lookup(pkg_name,
2776 loader_data->unnamed_module());
2777 }
2778
2779 // A package should have been successfully created
2780 DEBUG_ONLY(ResourceMark rm(THREAD));
2781 assert(_package_entry != NULL, "Package entry for class %s not found, loader %s",
2782 name()->as_C_string(), loader_data->loader_name_and_id());
2783 }
2784
2785 if (log_is_enabled(Debug, module)) {
2786 ResourceMark rm(THREAD);
2787 ModuleEntry* m = _package_entry->module();
2788 log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s",
2789 external_name(),
2790 pkg_name->as_C_string(),
2791 loader_data->loader_name_and_id(),
2792 (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE));
2793 }
2794 } else {
2795 ResourceMark rm(THREAD);
2796 log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s",
2797 external_name(),
2798 (loader_data != NULL) ? loader_data->loader_name_and_id() : "NULL",
2799 UNNAMED_MODULE);
2800 }
2801 }
2802
2803 // Function set_classpath_index checks if the package of the InstanceKlass is in the
2804 // boot loader's package entry table. If so, then it sets the classpath_index
2805 // in the package entry record.
2806 //
2807 // The classpath_index field is used to find the entry on the boot loader class
2808 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
2809 // in an unnamed module. It is also used to indicate (for all packages whose
2810 // classes are loaded by the boot loader) that at least one of the package's
2811 // classes has been loaded.
2812 void InstanceKlass::set_classpath_index(s2 path_index, TRAPS) {
2813 if (_package_entry != NULL) {
2814 DEBUG_ONLY(PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();)
2815 assert(pkg_entry_tbl->lookup_only(_package_entry->name()) == _package_entry, "Should be same");
2816 assert(path_index != -1, "Unexpected classpath_index");
2817 _package_entry->set_classpath_index(path_index);
2818 }
2819 }
2820
2821 // different versions of is_same_class_package
2822
2823 bool InstanceKlass::is_same_class_package(const Klass* class2) const {
2824 oop classloader1 = this->class_loader();
2825 PackageEntry* classpkg1 = this->package();
2826 if (class2->is_objArray_klass()) {
2827 class2 = ObjArrayKlass::cast(class2)->bottom_klass();
2828 }
2829
2830 oop classloader2;
2831 PackageEntry* classpkg2;
2832 if (class2->is_instance_klass()) {
2833 classloader2 = class2->class_loader();
2834 classpkg2 = class2->package();
2835 } else {
2836 assert(class2->is_typeArray_klass(), "should be type array");
2837 classloader2 = NULL;
2838 classpkg2 = NULL;
2839 }
2840
2841 // Same package is determined by comparing class loader
2842 // and package entries. Both must be the same. This rule
2843 // applies even to classes that are defined in the unnamed
2844 // package, they still must have the same class loader.
2845 if ((classloader1 == classloader2) && (classpkg1 == classpkg2)) {
2846 return true;
2847 }
2848
2849 return false;
2850 }
2851
2852 // return true if this class and other_class are in the same package. Classloader
2853 // and classname information is enough to determine a class's package
2854 bool InstanceKlass::is_same_class_package(oop other_class_loader,
2855 const Symbol* other_class_name) const {
2856 if (class_loader() != other_class_loader) {
2857 return false;
2858 }
2859 if (name()->fast_compare(other_class_name) == 0) {
2860 return true;
2861 }
2862
2863 {
2864 ResourceMark rm;
2865
2866 bool bad_class_name = false;
2867 TempNewSymbol other_pkg = ClassLoader::package_from_class_name(other_class_name, &bad_class_name);
2868 if (bad_class_name) {
2869 return false;
2870 }
2871 // Check that package_from_class_name() returns NULL, not "", if there is no package.
2872 assert(other_pkg == NULL || other_pkg->utf8_length() > 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 this_package_name == other_pkg;
2881 }
2882
2883 // Check if package is identical
2884 return this_package_name->fast_compare(other_pkg) == 0;
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 = ClassLoader::package_from_class_name(class_name);
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() COMPILER2_PRESENT(|| StressRecompilation),
3105 "redundant 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 (record_components() != NULL) {
3356 st->print(BULLET"record components: "); record_components()->print_value_on(st); st->cr();
3357 }
3358 if (java_mirror() != NULL) {
3359 st->print(BULLET"java mirror: ");
3360 java_mirror()->print_value_on(st);
3361 st->cr();
3362 } else {
3363 st->print_cr(BULLET"java mirror: NULL");
3364 }
3365 st->print(BULLET"vtable length %d (start addr: " INTPTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
3366 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st);
3367 st->print(BULLET"itable length %d (start addr: " INTPTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
3368 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_itable(), itable_length(), st);
3369 st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
3370 FieldPrinter print_static_field(st);
3371 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
3372 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
3373 FieldPrinter print_nonstatic_field(st);
3374 InstanceKlass* ik = const_cast<InstanceKlass*>(this);
3375 ik->do_nonstatic_fields(&print_nonstatic_field);
3376
3377 st->print(BULLET"non-static oop maps: ");
3378 OopMapBlock* map = start_of_nonstatic_oop_maps();
3379 OopMapBlock* end_map = map + nonstatic_oop_map_count();
3380 while (map < end_map) {
3381 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
3382 map++;
3383 }
3384 st->cr();
3385 }
3386
3387 #endif //PRODUCT
3388
3389 void InstanceKlass::print_value_on(outputStream* st) const {
3390 assert(is_klass(), "must be klass");
3391 if (Verbose || WizardMode) access_flags().print_on(st);
3392 name()->print_value_on(st);
3393 }
3394
3395 #ifndef PRODUCT
3396
3397 void FieldPrinter::do_field(fieldDescriptor* fd) {
3398 _st->print(BULLET);
3399 if (_obj == NULL) {
3400 fd->print_on(_st);
3401 _st->cr();
3402 } else {
3403 fd->print_on_for(_st, _obj);
3404 _st->cr();
3405 }
3406 }
3407
3408
3409 void InstanceKlass::oop_print_on(oop obj, outputStream* st) {
3410 Klass::oop_print_on(obj, st);
3411
3412 if (this == SystemDictionary::String_klass()) {
3413 typeArrayOop value = java_lang_String::value(obj);
3414 juint length = java_lang_String::length(obj);
3415 if (value != NULL &&
3416 value->is_typeArray() &&
3417 length <= (juint) value->length()) {
3418 st->print(BULLET"string: ");
3419 java_lang_String::print(obj, st);
3420 st->cr();
3421 if (!WizardMode) return; // that is enough
3422 }
3423 }
3424
3425 st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj));
3426 FieldPrinter print_field(st, obj);
3427 do_nonstatic_fields(&print_field);
3428
3429 if (this == SystemDictionary::Class_klass()) {
3430 st->print(BULLET"signature: ");
3431 java_lang_Class::print_signature(obj, st);
3432 st->cr();
3433 Klass* mirrored_klass = java_lang_Class::as_Klass(obj);
3434 st->print(BULLET"fake entry for mirror: ");
3435 Metadata::print_value_on_maybe_null(st, mirrored_klass);
3436 st->cr();
3437 Klass* array_klass = java_lang_Class::array_klass_acquire(obj);
3438 st->print(BULLET"fake entry for array: ");
3439 Metadata::print_value_on_maybe_null(st, array_klass);
3440 st->cr();
3441 st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj));
3442 st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj));
3443 Klass* real_klass = java_lang_Class::as_Klass(obj);
3444 if (real_klass != NULL && real_klass->is_instance_klass()) {
3445 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
3446 }
3447 } else if (this == SystemDictionary::MethodType_klass()) {
3448 st->print(BULLET"signature: ");
3449 java_lang_invoke_MethodType::print_signature(obj, st);
3450 st->cr();
3451 }
3452 }
3453
3454 bool InstanceKlass::verify_itable_index(int i) {
3455 int method_count = klassItable::method_count_for_interface(this);
3456 assert(i >= 0 && i < method_count, "index out of bounds");
3457 return true;
3458 }
3459
3460 #endif //PRODUCT
3461
3462 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
3463 st->print("a ");
3464 name()->print_value_on(st);
3465 obj->print_address_on(st);
3466 if (this == SystemDictionary::String_klass()
3467 && java_lang_String::value(obj) != NULL) {
3468 ResourceMark rm;
3469 int len = java_lang_String::length(obj);
3470 int plen = (len < 24 ? len : 12);
3471 char* str = java_lang_String::as_utf8_string(obj, 0, plen);
3472 st->print(" = \"%s\"", str);
3473 if (len > plen)
3474 st->print("...[%d]", len);
3475 } else if (this == SystemDictionary::Class_klass()) {
3476 Klass* k = java_lang_Class::as_Klass(obj);
3477 st->print(" = ");
3478 if (k != NULL) {
3479 k->print_value_on(st);
3480 } else {
3481 const char* tname = type2name(java_lang_Class::primitive_type(obj));
3482 st->print("%s", tname ? tname : "type?");
3483 }
3484 } else if (this == SystemDictionary::MethodType_klass()) {
3485 st->print(" = ");
3486 java_lang_invoke_MethodType::print_signature(obj, st);
3487 } else if (java_lang_boxing_object::is_instance(obj)) {
3488 st->print(" = ");
3489 java_lang_boxing_object::print(obj, st);
3490 } else if (this == SystemDictionary::LambdaForm_klass()) {
3491 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
3492 if (vmentry != NULL) {
3493 st->print(" => ");
3494 vmentry->print_value_on(st);
3495 }
3496 } else if (this == SystemDictionary::MemberName_klass()) {
3497 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
3498 if (vmtarget != NULL) {
3499 st->print(" = ");
3500 vmtarget->print_value_on(st);
3501 } else {
3502 java_lang_invoke_MemberName::clazz(obj)->print_value_on(st);
3503 st->print(".");
3504 java_lang_invoke_MemberName::name(obj)->print_value_on(st);
3505 }
3506 }
3507 }
3508
3509 const char* InstanceKlass::internal_name() const {
3510 return external_name();
3511 }
3512
3513 void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data,
3514 const char* module_name,
3515 const ClassFileStream* cfs) const {
3516 if (!log_is_enabled(Info, class, load)) {
3517 return;
3518 }
3519
3520 ResourceMark rm;
3521 LogMessage(class, load) msg;
3522 stringStream info_stream;
3523
3524 // Name and class hierarchy info
3525 info_stream.print("%s", external_name());
3526
3527 // Source
3528 if (cfs != NULL) {
3529 if (cfs->source() != NULL) {
3530 if (module_name != NULL) {
3531 // When the boot loader created the stream, it didn't know the module name
3532 // yet. Let's format it now.
3533 if (cfs->from_boot_loader_modules_image()) {
3534 info_stream.print(" source: jrt:/%s", module_name);
3535 } else {
3536 info_stream.print(" source: %s", cfs->source());
3537 }
3538 } else {
3539 info_stream.print(" source: %s", cfs->source());
3540 }
3541 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) {
3542 Thread* THREAD = Thread::current();
3543 Klass* caller =
3544 THREAD->is_Java_thread()
3545 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
3546 : NULL;
3547 // caller can be NULL, for example, during a JVMTI VM_Init hook
3548 if (caller != NULL) {
3549 info_stream.print(" source: instance of %s", caller->external_name());
3550 } else {
3551 // source is unknown
3552 }
3553 } else {
3554 oop class_loader = loader_data->class_loader();
3555 info_stream.print(" source: %s", class_loader->klass()->external_name());
3556 }
3557 } else {
3558 assert(this->is_shared(), "must be");
3559 if (MetaspaceShared::is_shared_dynamic((void*)this)) {
3560 info_stream.print(" source: shared objects file (top)");
3561 } else {
3562 info_stream.print(" source: shared objects file");
3563 }
3564 }
3565
3566 msg.info("%s", info_stream.as_string());
3567
3568 if (log_is_enabled(Debug, class, load)) {
3569 stringStream debug_stream;
3570
3571 // Class hierarchy info
3572 debug_stream.print(" klass: " INTPTR_FORMAT " super: " INTPTR_FORMAT,
3573 p2i(this), p2i(superklass()));
3574
3575 // Interfaces
3576 if (local_interfaces() != NULL && local_interfaces()->length() > 0) {
3577 debug_stream.print(" interfaces:");
3578 int length = local_interfaces()->length();
3579 for (int i = 0; i < length; i++) {
3580 debug_stream.print(" " INTPTR_FORMAT,
3581 p2i(InstanceKlass::cast(local_interfaces()->at(i))));
3582 }
3583 }
3584
3585 // Class loader
3586 debug_stream.print(" loader: [");
3587 loader_data->print_value_on(&debug_stream);
3588 debug_stream.print("]");
3589
3590 // Classfile checksum
3591 if (cfs) {
3592 debug_stream.print(" bytes: %d checksum: %08x",
3593 cfs->length(),
3594 ClassLoader::crc32(0, (const char*)cfs->buffer(),
3595 cfs->length()));
3596 }
3597
3598 msg.debug("%s", debug_stream.as_string());
3599 }
3600 }
3601
3602 // Verification
3603
3604 class VerifyFieldClosure: public BasicOopIterateClosure {
3605 protected:
3606 template <class T> void do_oop_work(T* p) {
3607 oop obj = RawAccess<>::oop_load(p);
3608 if (!oopDesc::is_oop_or_null(obj)) {
3609 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj));
3610 Universe::print_on(tty);
3611 guarantee(false, "boom");
3612 }
3613 }
3614 public:
3615 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); }
3616 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
3617 };
3618
3619 void InstanceKlass::verify_on(outputStream* st) {
3620 #ifndef PRODUCT
3621 // Avoid redundant verifies, this really should be in product.
3622 if (_verify_count == Universe::verify_count()) return;
3623 _verify_count = Universe::verify_count();
3624 #endif
3625
3626 // Verify Klass
3627 Klass::verify_on(st);
3628
3629 // Verify that klass is present in ClassLoaderData
3630 guarantee(class_loader_data()->contains_klass(this),
3631 "this class isn't found in class loader data");
3632
3633 // Verify vtables
3634 if (is_linked()) {
3635 // $$$ This used to be done only for m/s collections. Doing it
3636 // always seemed a valid generalization. (DLD -- 6/00)
3637 vtable().verify(st);
3638 }
3639
3640 // Verify first subklass
3641 if (subklass() != NULL) {
3642 guarantee(subklass()->is_klass(), "should be klass");
3643 }
3644
3645 // Verify siblings
3646 Klass* super = this->super();
3647 Klass* sib = next_sibling();
3648 if (sib != NULL) {
3649 if (sib == this) {
3650 fatal("subclass points to itself " PTR_FORMAT, p2i(sib));
3651 }
3652
3653 guarantee(sib->is_klass(), "should be klass");
3654 guarantee(sib->super() == super, "siblings should have same superklass");
3655 }
3656
3657 // Verify local interfaces
3658 if (local_interfaces()) {
3659 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
3660 for (int j = 0; j < local_interfaces->length(); j++) {
3661 InstanceKlass* e = local_interfaces->at(j);
3662 guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
3663 }
3664 }
3665
3666 // Verify transitive interfaces
3667 if (transitive_interfaces() != NULL) {
3668 Array<InstanceKlass*>* transitive_interfaces = this->transitive_interfaces();
3669 for (int j = 0; j < transitive_interfaces->length(); j++) {
3670 InstanceKlass* e = transitive_interfaces->at(j);
3671 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
3672 }
3673 }
3674
3675 // Verify methods
3676 if (methods() != NULL) {
3677 Array<Method*>* methods = this->methods();
3678 for (int j = 0; j < methods->length(); j++) {
3679 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3680 }
3681 for (int j = 0; j < methods->length() - 1; j++) {
3682 Method* m1 = methods->at(j);
3683 Method* m2 = methods->at(j + 1);
3684 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3685 }
3686 }
3687
3688 // Verify method ordering
3689 if (method_ordering() != NULL) {
3690 Array<int>* method_ordering = this->method_ordering();
3691 int length = method_ordering->length();
3692 if (JvmtiExport::can_maintain_original_method_order() ||
3693 ((UseSharedSpaces || Arguments::is_dumping_archive()) && length != 0)) {
3694 guarantee(length == methods()->length(), "invalid method ordering length");
3695 jlong sum = 0;
3696 for (int j = 0; j < length; j++) {
3697 int original_index = method_ordering->at(j);
3698 guarantee(original_index >= 0, "invalid method ordering index");
3699 guarantee(original_index < length, "invalid method ordering index");
3700 sum += original_index;
3701 }
3702 // Verify sum of indices 0,1,...,length-1
3703 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
3704 } else {
3705 guarantee(length == 0, "invalid method ordering length");
3706 }
3707 }
3708
3709 // Verify default methods
3710 if (default_methods() != NULL) {
3711 Array<Method*>* methods = this->default_methods();
3712 for (int j = 0; j < methods->length(); j++) {
3713 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3714 }
3715 for (int j = 0; j < methods->length() - 1; j++) {
3716 Method* m1 = methods->at(j);
3717 Method* m2 = methods->at(j + 1);
3718 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3719 }
3720 }
3721
3722 // Verify JNI static field identifiers
3723 if (jni_ids() != NULL) {
3724 jni_ids()->verify(this);
3725 }
3726
3727 // Verify other fields
3728 if (constants() != NULL) {
3729 guarantee(constants()->is_constantPool(), "should be constant pool");
3730 }
3731 const Klass* anonymous_host = unsafe_anonymous_host();
3732 if (anonymous_host != NULL) {
3733 guarantee(anonymous_host->is_klass(), "should be klass");
3734 }
3735 }
3736
3737 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
3738 Klass::oop_verify_on(obj, st);
3739 VerifyFieldClosure blk;
3740 obj->oop_iterate(&blk);
3741 }
3742
3743
3744 // JNIid class for jfieldIDs only
3745 // Note to reviewers:
3746 // These JNI functions are just moved over to column 1 and not changed
3747 // in the compressed oops workspace.
3748 JNIid::JNIid(Klass* holder, int offset, JNIid* next) {
3749 _holder = holder;
3750 _offset = offset;
3751 _next = next;
3752 debug_only(_is_static_field_id = false;)
3753 }
3754
3755
3756 JNIid* JNIid::find(int offset) {
3757 JNIid* current = this;
3758 while (current != NULL) {
3759 if (current->offset() == offset) return current;
3760 current = current->next();
3761 }
3762 return NULL;
3763 }
3764
3765 void JNIid::deallocate(JNIid* current) {
3766 while (current != NULL) {
3767 JNIid* next = current->next();
3768 delete current;
3769 current = next;
3770 }
3771 }
3772
3773
3774 void JNIid::verify(Klass* holder) {
3775 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields();
3776 int end_field_offset;
3777 end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize);
3778
3779 JNIid* current = this;
3780 while (current != NULL) {
3781 guarantee(current->holder() == holder, "Invalid klass in JNIid");
3782 #ifdef ASSERT
3783 int o = current->offset();
3784 if (current->is_static_field_id()) {
3785 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid");
3786 }
3787 #endif
3788 current = current->next();
3789 }
3790 }
3791
3792 void InstanceKlass::set_init_state(ClassState state) {
3793 #ifdef ASSERT
3794 bool good_state = is_shared() ? (_init_state <= state)
3795 : (_init_state < state);
3796 assert(good_state || state == allocated, "illegal state transition");
3797 #endif
3798 assert(_init_thread == NULL, "should be cleared before state change");
3799 _init_state = (u1)state;
3800 }
3801
3802 #if INCLUDE_JVMTI
3803
3804 // RedefineClasses() support for previous versions
3805
3806 // Globally, there is at least one previous version of a class to walk
3807 // during class unloading, which is saved because old methods in the class
3808 // are still running. Otherwise the previous version list is cleaned up.
3809 bool InstanceKlass::_has_previous_versions = false;
3810
3811 // Returns true if there are previous versions of a class for class
3812 // unloading only. Also resets the flag to false. purge_previous_version
3813 // will set the flag to true if there are any left, i.e., if there's any
3814 // work to do for next time. This is to avoid the expensive code cache
3815 // walk in CLDG::clean_deallocate_lists().
3816 bool InstanceKlass::has_previous_versions_and_reset() {
3817 bool ret = _has_previous_versions;
3818 log_trace(redefine, class, iklass, purge)("Class unloading: has_previous_versions = %s",
3819 ret ? "true" : "false");
3820 _has_previous_versions = false;
3821 return ret;
3822 }
3823
3824 // Purge previous versions before adding new previous versions of the class and
3825 // during class unloading.
3826 void InstanceKlass::purge_previous_version_list() {
3827 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
3828 assert(has_been_redefined(), "Should only be called for main class");
3829
3830 // Quick exit.
3831 if (previous_versions() == NULL) {
3832 return;
3833 }
3834
3835 // This klass has previous versions so see what we can cleanup
3836 // while it is safe to do so.
3837
3838 int deleted_count = 0; // leave debugging breadcrumbs
3839 int live_count = 0;
3840 ClassLoaderData* loader_data = class_loader_data();
3841 assert(loader_data != NULL, "should never be null");
3842
3843 ResourceMark rm;
3844 log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name());
3845
3846 // previous versions are linked together through the InstanceKlass
3847 InstanceKlass* pv_node = previous_versions();
3848 InstanceKlass* last = this;
3849 int version = 0;
3850
3851 // check the previous versions list
3852 for (; pv_node != NULL; ) {
3853
3854 ConstantPool* pvcp = pv_node->constants();
3855 assert(pvcp != NULL, "cp ref was unexpectedly cleared");
3856
3857 if (!pvcp->on_stack()) {
3858 // If the constant pool isn't on stack, none of the methods
3859 // are executing. Unlink this previous_version.
3860 // The previous version InstanceKlass is on the ClassLoaderData deallocate list
3861 // so will be deallocated during the next phase of class unloading.
3862 log_trace(redefine, class, iklass, purge)
3863 ("previous version " INTPTR_FORMAT " is dead.", p2i(pv_node));
3864 // For debugging purposes.
3865 pv_node->set_is_scratch_class();
3866 // Unlink from previous version list.
3867 assert(pv_node->class_loader_data() == loader_data, "wrong loader_data");
3868 InstanceKlass* next = pv_node->previous_versions();
3869 pv_node->link_previous_versions(NULL); // point next to NULL
3870 last->link_previous_versions(next);
3871 // Add to the deallocate list after unlinking
3872 loader_data->add_to_deallocate_list(pv_node);
3873 pv_node = next;
3874 deleted_count++;
3875 version++;
3876 continue;
3877 } else {
3878 log_trace(redefine, class, iklass, purge)("previous version " INTPTR_FORMAT " is alive", p2i(pv_node));
3879 assert(pvcp->pool_holder() != NULL, "Constant pool with no holder");
3880 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
3881 live_count++;
3882 // found a previous version for next time we do class unloading
3883 _has_previous_versions = true;
3884 }
3885
3886 // At least one method is live in this previous version.
3887 // Reset dead EMCP methods not to get breakpoints.
3888 // All methods are deallocated when all of the methods for this class are no
3889 // longer running.
3890 Array<Method*>* method_refs = pv_node->methods();
3891 if (method_refs != NULL) {
3892 log_trace(redefine, class, iklass, purge)("previous methods length=%d", method_refs->length());
3893 for (int j = 0; j < method_refs->length(); j++) {
3894 Method* method = method_refs->at(j);
3895
3896 if (!method->on_stack()) {
3897 // no breakpoints for non-running methods
3898 if (method->is_running_emcp()) {
3899 method->set_running_emcp(false);
3900 }
3901 } else {
3902 assert (method->is_obsolete() || method->is_running_emcp(),
3903 "emcp method cannot run after emcp bit is cleared");
3904 log_trace(redefine, class, iklass, purge)
3905 ("purge: %s(%s): prev method @%d in version @%d is alive",
3906 method->name()->as_C_string(), method->signature()->as_C_string(), j, version);
3907 }
3908 }
3909 }
3910 // next previous version
3911 last = pv_node;
3912 pv_node = pv_node->previous_versions();
3913 version++;
3914 }
3915 log_trace(redefine, class, iklass, purge)
3916 ("previous version stats: live=%d, deleted=%d", live_count, deleted_count);
3917 }
3918
3919 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods,
3920 int emcp_method_count) {
3921 int obsolete_method_count = old_methods->length() - emcp_method_count;
3922
3923 if (emcp_method_count != 0 && obsolete_method_count != 0 &&
3924 _previous_versions != NULL) {
3925 // We have a mix of obsolete and EMCP methods so we have to
3926 // clear out any matching EMCP method entries the hard way.
3927 int local_count = 0;
3928 for (int i = 0; i < old_methods->length(); i++) {
3929 Method* old_method = old_methods->at(i);
3930 if (old_method->is_obsolete()) {
3931 // only obsolete methods are interesting
3932 Symbol* m_name = old_method->name();
3933 Symbol* m_signature = old_method->signature();
3934
3935 // previous versions are linked together through the InstanceKlass
3936 int j = 0;
3937 for (InstanceKlass* prev_version = _previous_versions;
3938 prev_version != NULL;
3939 prev_version = prev_version->previous_versions(), j++) {
3940
3941 Array<Method*>* method_refs = prev_version->methods();
3942 for (int k = 0; k < method_refs->length(); k++) {
3943 Method* method = method_refs->at(k);
3944
3945 if (!method->is_obsolete() &&
3946 method->name() == m_name &&
3947 method->signature() == m_signature) {
3948 // The current RedefineClasses() call has made all EMCP
3949 // versions of this method obsolete so mark it as obsolete
3950 log_trace(redefine, class, iklass, add)
3951 ("%s(%s): flush obsolete method @%d in version @%d",
3952 m_name->as_C_string(), m_signature->as_C_string(), k, j);
3953
3954 method->set_is_obsolete();
3955 break;
3956 }
3957 }
3958
3959 // The previous loop may not find a matching EMCP method, but
3960 // that doesn't mean that we can optimize and not go any
3961 // further back in the PreviousVersion generations. The EMCP
3962 // method for this generation could have already been made obsolete,
3963 // but there still may be an older EMCP method that has not
3964 // been made obsolete.
3965 }
3966
3967 if (++local_count >= obsolete_method_count) {
3968 // no more obsolete methods so bail out now
3969 break;
3970 }
3971 }
3972 }
3973 }
3974 }
3975
3976 // Save the scratch_class as the previous version if any of the methods are running.
3977 // The previous_versions are used to set breakpoints in EMCP methods and they are
3978 // also used to clean MethodData links to redefined methods that are no longer running.
3979 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class,
3980 int emcp_method_count) {
3981 assert(Thread::current()->is_VM_thread(),
3982 "only VMThread can add previous versions");
3983
3984 ResourceMark rm;
3985 log_trace(redefine, class, iklass, add)
3986 ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count);
3987
3988 // Clean out old previous versions for this class
3989 purge_previous_version_list();
3990
3991 // Mark newly obsolete methods in remaining previous versions. An EMCP method from
3992 // a previous redefinition may be made obsolete by this redefinition.
3993 Array<Method*>* old_methods = scratch_class->methods();
3994 mark_newly_obsolete_methods(old_methods, emcp_method_count);
3995
3996 // If the constant pool for this previous version of the class
3997 // is not marked as being on the stack, then none of the methods
3998 // in this previous version of the class are on the stack so
3999 // we don't need to add this as a previous version.
4000 ConstantPool* cp_ref = scratch_class->constants();
4001 if (!cp_ref->on_stack()) {
4002 log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running");
4003 // For debugging purposes.
4004 scratch_class->set_is_scratch_class();
4005 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class);
4006 return;
4007 }
4008
4009 if (emcp_method_count != 0) {
4010 // At least one method is still running, check for EMCP methods
4011 for (int i = 0; i < old_methods->length(); i++) {
4012 Method* old_method = old_methods->at(i);
4013 if (!old_method->is_obsolete() && old_method->on_stack()) {
4014 // if EMCP method (not obsolete) is on the stack, mark as EMCP so that
4015 // we can add breakpoints for it.
4016
4017 // We set the method->on_stack bit during safepoints for class redefinition
4018 // and use this bit to set the is_running_emcp bit.
4019 // After the safepoint, the on_stack bit is cleared and the running emcp
4020 // method may exit. If so, we would set a breakpoint in a method that
4021 // is never reached, but this won't be noticeable to the programmer.
4022 old_method->set_running_emcp(true);
4023 log_trace(redefine, class, iklass, add)
4024 ("EMCP method %s is on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
4025 } else if (!old_method->is_obsolete()) {
4026 log_trace(redefine, class, iklass, add)
4027 ("EMCP method %s is NOT on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
4028 }
4029 }
4030 }
4031
4032 // Add previous version if any methods are still running.
4033 // Set has_previous_version flag for processing during class unloading.
4034 _has_previous_versions = true;
4035 log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack.");
4036 assert(scratch_class->previous_versions() == NULL, "shouldn't have a previous version");
4037 scratch_class->link_previous_versions(previous_versions());
4038 link_previous_versions(scratch_class);
4039 } // end add_previous_version()
4040
4041 #endif // INCLUDE_JVMTI
4042
4043 Method* InstanceKlass::method_with_idnum(int idnum) {
4044 Method* m = NULL;
4045 if (idnum < methods()->length()) {
4046 m = methods()->at(idnum);
4047 }
4048 if (m == NULL || m->method_idnum() != idnum) {
4049 for (int index = 0; index < methods()->length(); ++index) {
4050 m = methods()->at(index);
4051 if (m->method_idnum() == idnum) {
4052 return m;
4053 }
4054 }
4055 // None found, return null for the caller to handle.
4056 return NULL;
4057 }
4058 return m;
4059 }
4060
4061
4062 Method* InstanceKlass::method_with_orig_idnum(int idnum) {
4063 if (idnum >= methods()->length()) {
4064 return NULL;
4065 }
4066 Method* m = methods()->at(idnum);
4067 if (m != NULL && m->orig_method_idnum() == idnum) {
4068 return m;
4069 }
4070 // Obsolete method idnum does not match the original idnum
4071 for (int index = 0; index < methods()->length(); ++index) {
4072 m = methods()->at(index);
4073 if (m->orig_method_idnum() == idnum) {
4074 return m;
4075 }
4076 }
4077 // None found, return null for the caller to handle.
4078 return NULL;
4079 }
4080
4081
4082 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) {
4083 InstanceKlass* holder = get_klass_version(version);
4084 if (holder == NULL) {
4085 return NULL; // The version of klass is gone, no method is found
4086 }
4087 Method* method = holder->method_with_orig_idnum(idnum);
4088 return method;
4089 }
4090
4091 #if INCLUDE_JVMTI
4092 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() {
4093 return _cached_class_file;
4094 }
4095
4096 jint InstanceKlass::get_cached_class_file_len() {
4097 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
4098 }
4099
4100 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
4101 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
4102 }
4103 #endif