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