1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "aot/aotLoader.hpp"
28 #include "classfile/classFileParser.hpp"
29 #include "classfile/classFileStream.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/classLoaderData.inline.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/symbolTable.hpp"
35 #include "classfile/systemDictionary.hpp"
36 #include "classfile/systemDictionaryShared.hpp"
37 #include "classfile/verifier.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "code/dependencyContext.hpp"
40 #include "compiler/compileBroker.hpp"
41 #include "gc/shared/collectedHeap.inline.hpp"
42 #include "interpreter/oopMapCache.hpp"
43 #include "interpreter/rewriter.hpp"
44 #include "jvmtifiles/jvmti.h"
45 #include "logging/log.hpp"
46 #include "logging/logMessage.hpp"
47 #include "logging/logStream.hpp"
48 #include "memory/allocation.inline.hpp"
49 #include "memory/heapInspection.hpp"
50 #include "memory/iterator.inline.hpp"
51 #include "memory/metadataFactory.hpp"
52 #include "memory/metaspaceClosure.hpp"
53 #include "memory/metaspaceShared.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/resourceArea.hpp"
56 #include "memory/universe.hpp"
57 #include "oops/fieldStreams.hpp"
58 #include "oops/constantPool.hpp"
59 #include "oops/instanceClassLoaderKlass.hpp"
60 #include "oops/instanceKlass.inline.hpp"
61 #include "oops/instanceMirrorKlass.hpp"
62 #include "oops/instanceOop.hpp"
63 #include "oops/klass.inline.hpp"
64 #include "oops/method.hpp"
65 #include "oops/oop.inline.hpp"
66 #include "oops/symbol.hpp"
67 #include "oops/valueKlass.hpp"
68 #include "prims/jvmtiExport.hpp"
69 #include "prims/jvmtiRedefineClasses.hpp"
70 #include "prims/jvmtiThreadState.hpp"
71 #include "prims/methodComparator.hpp"
72 #include "runtime/atomic.hpp"
73 #include "runtime/biasedLocking.hpp"
74 #include "runtime/fieldDescriptor.inline.hpp"
75 #include "runtime/handles.inline.hpp"
76 #include "runtime/javaCalls.hpp"
77 #include "runtime/mutexLocker.hpp"
78 #include "runtime/orderAccess.hpp"
79 #include "runtime/thread.inline.hpp"
80 #include "services/classLoadingService.hpp"
81 #include "services/threadService.hpp"
82 #include "utilities/dtrace.hpp"
83 #include "utilities/events.hpp"
84 #include "utilities/macros.hpp"
85 #include "utilities/stringUtils.hpp"
86 #ifdef COMPILER1
87 #include "c1/c1_Compiler.hpp"
88 #endif
89 #if INCLUDE_JFR
90 #include "jfr/jfrEvents.hpp"
91 #endif
92
93
94 #ifdef DTRACE_ENABLED
95
96
97 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED
98 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE
99 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT
100 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS
101 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED
102 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT
103 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR
104 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END
105 #define DTRACE_CLASSINIT_PROBE(type, thread_type) \
106 { \
107 char* data = NULL; \
108 int len = 0; \
109 Symbol* clss_name = name(); \
110 if (clss_name != NULL) { \
111 data = (char*)clss_name->bytes(); \
112 len = clss_name->utf8_length(); \
113 } \
114 HOTSPOT_CLASS_INITIALIZATION_##type( \
115 data, len, (void*)class_loader(), thread_type); \
116 }
117
118 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) \
119 { \
120 char* data = NULL; \
121 int len = 0; \
122 Symbol* clss_name = name(); \
123 if (clss_name != NULL) { \
124 data = (char*)clss_name->bytes(); \
125 len = clss_name->utf8_length(); \
126 } \
127 HOTSPOT_CLASS_INITIALIZATION_##type( \
128 data, len, (void*)class_loader(), thread_type, wait); \
129 }
130
131 #else // ndef DTRACE_ENABLED
132
133 #define DTRACE_CLASSINIT_PROBE(type, thread_type)
134 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait)
135
136 #endif // ndef DTRACE_ENABLED
137
138 static inline bool is_class_loader(const Symbol* class_name,
139 const ClassFileParser& parser) {
140 assert(class_name != NULL, "invariant");
141
142 if (class_name == vmSymbols::java_lang_ClassLoader()) {
143 return true;
144 }
145
146 if (SystemDictionary::ClassLoader_klass_loaded()) {
147 const Klass* const super_klass = parser.super_klass();
148 if (super_klass != NULL) {
149 if (super_klass->is_subtype_of(SystemDictionary::ClassLoader_klass())) {
150 return true;
151 }
152 }
153 }
154 return false;
155 }
156
157 // called to verify that k is a member of this nest
158 bool InstanceKlass::has_nest_member(InstanceKlass* k, TRAPS) const {
159 if (_nest_members == NULL || _nest_members == Universe::the_empty_short_array()) {
160 if (log_is_enabled(Trace, class, nestmates)) {
161 ResourceMark rm(THREAD);
162 log_trace(class, nestmates)("Checked nest membership of %s in non-nest-host class %s",
163 k->external_name(), this->external_name());
164 }
165 return false;
166 }
167
168 if (log_is_enabled(Trace, class, nestmates)) {
169 ResourceMark rm(THREAD);
170 log_trace(class, nestmates)("Checking nest membership of %s in %s",
171 k->external_name(), this->external_name());
172 }
173
174 // Check for a resolved cp entry , else fall back to a name check.
175 // We don't want to resolve any class other than the one being checked.
176 for (int i = 0; i < _nest_members->length(); i++) {
177 int cp_index = _nest_members->at(i);
178 if (_constants->tag_at(cp_index).is_klass()) {
179 Klass* k2 = _constants->klass_at(cp_index, CHECK_false);
180 if (k2 == k) {
181 log_trace(class, nestmates)("- class is listed at nest_members[%d] => cp[%d]", i, cp_index);
182 return true;
183 }
184 }
185 else {
186 Symbol* name = _constants->klass_name_at(cp_index);
187 if (name == k->name()) {
188 log_trace(class, nestmates)("- Found it at nest_members[%d] => cp[%d]", i, cp_index);
189
190 // Names match so check actual klass - this may trigger class loading if
191 // it doesn't match (though that should be impossible). But to be safe we
192 // have to check for a compiler thread executing here.
193 if (!THREAD->can_call_java() && !_constants->tag_at(cp_index).is_klass()) {
194 log_trace(class, nestmates)("- validation required resolution in an unsuitable thread");
195 return false;
196 }
197
198 Klass* k2 = _constants->klass_at(cp_index, CHECK_false);
199 if (k2 == k) {
200 log_trace(class, nestmates)("- class is listed as a nest member");
201 return true;
202 }
203 else {
204 // same name but different klass!
205 log_trace(class, nestmates)(" - klass comparison failed!");
206 // can't have two names the same, so we're done
207 return false;
208 }
209 }
210 }
211 }
212 log_trace(class, nestmates)("- class is NOT a nest member!");
213 return false;
214 }
215
216 // Return nest-host class, resolving, validating and saving it if needed.
217 // In cases where this is called from a thread that can not do classloading
218 // (such as a native JIT thread) then we simply return NULL, which in turn
219 // causes the access check to return false. Such code will retry the access
220 // from a more suitable environment later.
221 InstanceKlass* InstanceKlass::nest_host(Symbol* validationException, TRAPS) {
222 InstanceKlass* nest_host_k = _nest_host;
223 if (nest_host_k == NULL) {
224 // need to resolve and save our nest-host class. This could be attempted
225 // concurrently but as the result is idempotent and we don't use the class
226 // then we do not need any synchronization beyond what is implicitly used
227 // during class loading.
228 if (_nest_host_index != 0) { // we have a real nest_host
229 // Before trying to resolve check if we're in a suitable context
230 if (!THREAD->can_call_java() && !_constants->tag_at(_nest_host_index).is_klass()) {
231 if (log_is_enabled(Trace, class, nestmates)) {
232 ResourceMark rm(THREAD);
233 log_trace(class, nestmates)("Rejected resolution of nest-host of %s in unsuitable thread",
234 this->external_name());
235 }
236 return NULL;
237 }
238
239 if (log_is_enabled(Trace, class, nestmates)) {
240 ResourceMark rm(THREAD);
241 log_trace(class, nestmates)("Resolving nest-host of %s using cp entry for %s",
242 this->external_name(),
243 _constants->klass_name_at(_nest_host_index)->as_C_string());
244 }
245
246 Klass* k = _constants->klass_at(_nest_host_index, THREAD);
247 if (HAS_PENDING_EXCEPTION) {
248 Handle exc_h = Handle(THREAD, PENDING_EXCEPTION);
249 if (exc_h->is_a(SystemDictionary::NoClassDefFoundError_klass())) {
250 // throw a new CDNFE with the original as its cause, and a clear msg
251 ResourceMark rm(THREAD);
252 char buf[200];
253 CLEAR_PENDING_EXCEPTION;
254 jio_snprintf(buf, sizeof(buf),
255 "Unable to load nest-host class (%s) of %s",
256 _constants->klass_name_at(_nest_host_index)->as_C_string(),
257 this->external_name());
258 log_trace(class, nestmates)("%s - NoClassDefFoundError", buf);
259 THROW_MSG_CAUSE_NULL(vmSymbols::java_lang_NoClassDefFoundError(), buf, exc_h);
260 }
261 // All other exceptions pass through (OOME, StackOverflowError, LinkageErrors etc).
262 return NULL;
263 }
264
265 // A valid nest-host is an instance class in the current package that lists this
266 // class as a nest member. If any of these conditions are not met we post the
267 // requested exception type (if any) and return NULL
268
269 const char* error = NULL;
270
271 // JVMS 5.4.4 indicates package check comes first
272 if (is_same_class_package(k)) {
273
274 // Now check actual membership. We can't be a member if our "host" is
275 // not an instance class.
276 if (k->is_instance_klass()) {
277 nest_host_k = InstanceKlass::cast(k);
278
279 bool is_member = nest_host_k->has_nest_member(this, CHECK_NULL);
280 if (is_member) {
281 // save resolved nest-host value
282 _nest_host = nest_host_k;
283
284 if (log_is_enabled(Trace, class, nestmates)) {
285 ResourceMark rm(THREAD);
286 log_trace(class, nestmates)("Resolved nest-host of %s to %s",
287 this->external_name(), k->external_name());
288 }
289 return nest_host_k;
290 }
291 }
292 error = "current type is not listed as a nest member";
293 } else {
294 error = "types are in different packages";
295 }
296
297 if (log_is_enabled(Trace, class, nestmates)) {
298 ResourceMark rm(THREAD);
299 log_trace(class, nestmates)
300 ("Type %s (loader: %s) is not a nest member of "
301 "resolved type %s (loader: %s): %s",
302 this->external_name(),
303 this->class_loader_data()->loader_name_and_id(),
304 k->external_name(),
305 k->class_loader_data()->loader_name_and_id(),
306 error);
307 }
308
309 if (validationException != NULL && THREAD->can_call_java()) {
310 ResourceMark rm(THREAD);
311 Exceptions::fthrow(THREAD_AND_LOCATION,
312 validationException,
313 "Type %s (loader: %s) is not a nest member of %s (loader: %s): %s",
314 this->external_name(),
315 this->class_loader_data()->loader_name_and_id(),
316 k->external_name(),
317 k->class_loader_data()->loader_name_and_id(),
318 error
319 );
320 }
321 return NULL;
322 } else {
323 if (log_is_enabled(Trace, class, nestmates)) {
324 ResourceMark rm(THREAD);
325 log_trace(class, nestmates)("Type %s is not part of a nest: setting nest-host to self",
326 this->external_name());
327 }
328 // save resolved nest-host value
329 return (_nest_host = this);
330 }
331 }
332 return nest_host_k;
333 }
334
335 // check if 'this' and k are nestmates (same nest_host), or k is our nest_host,
336 // or we are k's nest_host - all of which is covered by comparing the two
337 // resolved_nest_hosts
338 bool InstanceKlass::has_nestmate_access_to(InstanceKlass* k, TRAPS) {
339
340 assert(this != k, "this should be handled by higher-level code");
341
342 // Per JVMS 5.4.4 we first resolve and validate the current class, then
343 // the target class k. Resolution exceptions will be passed on by upper
344 // layers. IncompatibleClassChangeErrors from membership validation failures
345 // will also be passed through.
346
347 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
348 InstanceKlass* cur_host = nest_host(icce, CHECK_false);
349 if (cur_host == NULL) {
350 return false;
351 }
352
353 Klass* k_nest_host = k->nest_host(icce, CHECK_false);
354 if (k_nest_host == NULL) {
355 return false;
356 }
357
358 bool access = (cur_host == k_nest_host);
359
360 if (log_is_enabled(Trace, class, nestmates)) {
361 ResourceMark rm(THREAD);
362 log_trace(class, nestmates)("Class %s does %shave nestmate access to %s",
363 this->external_name(),
364 access ? "" : "NOT ",
365 k->external_name());
366 }
367
368 return access;
369 }
370
371 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) {
372 const int size = InstanceKlass::size(parser.vtable_size(),
373 parser.itable_size(),
374 nonstatic_oop_map_size(parser.total_oop_map_count()),
375 parser.is_interface(),
376 parser.is_unsafe_anonymous(),
377 should_store_fingerprint(parser.is_unsafe_anonymous()),
378 parser.has_flattenable_fields() ? parser.java_fields_count() : 0,
379 parser.is_value_type());
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 } else if (is_class_loader(class_name, parser)) {
394 // class loader
395 ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser);
396 } else if (parser.is_value_type()) {
397 // value type
398 ik = new (loader_data, size, THREAD) ValueKlass(parser);
399 } else {
400 // normal
401 ik = new (loader_data, size, THREAD) InstanceKlass(parser, InstanceKlass::_misc_kind_other);
402 }
403 } else {
404 // reference
405 ik = new (loader_data, size, THREAD) InstanceRefKlass(parser);
406 }
407
408 // Check for pending exception before adding to the loader data and incrementing
409 // class count. Can get OOM here.
410 if (HAS_PENDING_EXCEPTION) {
411 return NULL;
412 }
413
414 #ifdef ASSERT
415 assert(ik->size() == size, "");
416 ik->bounds_check((address) ik->start_of_vtable(), false, size);
417 ik->bounds_check((address) ik->start_of_itable(), false, size);
418 ik->bounds_check((address) ik->end_of_itable(), true, size);
419 ik->bounds_check((address) ik->end_of_nonstatic_oop_maps(), true, size);
420 #endif //ASSERT
421 return ik;
422 }
423
424 #ifndef PRODUCT
425 bool InstanceKlass::bounds_check(address addr, bool edge_ok, intptr_t size_in_bytes) const {
426 const char* bad = NULL;
427 address end = NULL;
428 if (addr < (address)this) {
429 bad = "before";
430 } else if (addr == (address)this) {
431 if (edge_ok) return true;
432 bad = "just before";
433 } else if (addr == (end = (address)this + sizeof(intptr_t) * (size_in_bytes < 0 ? size() : size_in_bytes))) {
434 if (edge_ok) return true;
435 bad = "just after";
436 } else if (addr > end) {
437 bad = "after";
438 } else {
439 return true;
440 }
441 tty->print_cr("%s object bounds: " INTPTR_FORMAT " [" INTPTR_FORMAT ".." INTPTR_FORMAT "]",
442 bad, (intptr_t)addr, (intptr_t)this, (intptr_t)end);
443 Verbose = WizardMode = true; this->print(); //@@
444 return false;
445 }
446 #endif //PRODUCT
447
448 // copy method ordering from resource area to Metaspace
449 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) {
450 if (m != NULL) {
451 // allocate a new array and copy contents (memcpy?)
452 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
453 for (int i = 0; i < m->length(); i++) {
454 _method_ordering->at_put(i, m->at(i));
455 }
456 } else {
457 _method_ordering = Universe::the_empty_int_array();
458 }
459 }
460
461 // create a new array of vtable_indices for default methods
462 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
463 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
464 assert(default_vtable_indices() == NULL, "only create once");
465 set_default_vtable_indices(vtable_indices);
466 return vtable_indices;
467 }
468
469 InstanceKlass::InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id) :
470 Klass(id),
471 _nest_members(NULL),
472 _nest_host_index(0),
473 _nest_host(NULL),
474 _static_field_size(parser.static_field_size()),
475 _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())),
476 _itable_len(parser.itable_size()),
477 _extra_flags(0),
478 _init_thread(NULL),
479 _init_state(allocated),
480 _reference_type(parser.reference_type()),
481 _adr_valueklass_fixed_block(NULL)
482 {
483 set_vtable_length(parser.vtable_size());
484 set_kind(kind);
485 set_access_flags(parser.access_flags());
486 set_is_unsafe_anonymous(parser.is_unsafe_anonymous());
487 set_layout_helper(Klass::instance_layout_helper(parser.layout_size(),
488 false));
489 if (parser.has_flattenable_fields()) {
490 set_has_value_fields();
491 }
492 _java_fields_count = parser.java_fields_count();
493
494 assert(NULL == _methods, "underlying memory not zeroed?");
495 assert(is_instance_klass(), "is layout incorrect?");
496 assert(size_helper() == parser.layout_size(), "incorrect size_helper?");
497
498 if (Arguments::is_dumping_archive()) {
499 SystemDictionaryShared::init_dumptime_info(this);
500 }
501
502 // Set biased locking bit for all instances of this class; it will be
503 // cleared if revocation occurs too often for this type
504 if (UseBiasedLocking && BiasedLocking::enabled()) {
505 set_prototype_header(markWord::biased_locking_prototype());
506 }
507 }
508
509 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
510 Array<Method*>* methods) {
511 if (methods != NULL && methods != Universe::the_empty_method_array() &&
512 !methods->is_shared()) {
513 for (int i = 0; i < methods->length(); i++) {
514 Method* method = methods->at(i);
515 if (method == NULL) continue; // maybe null if error processing
516 // Only want to delete methods that are not executing for RedefineClasses.
517 // The previous version will point to them so they're not totally dangling
518 assert (!method->on_stack(), "shouldn't be called with methods on stack");
519 MetadataFactory::free_metadata(loader_data, method);
520 }
521 MetadataFactory::free_array<Method*>(loader_data, methods);
522 }
523 }
524
525 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
526 const Klass* super_klass,
527 Array<InstanceKlass*>* local_interfaces,
528 Array<InstanceKlass*>* transitive_interfaces) {
529 // Only deallocate transitive interfaces if not empty, same as super class
530 // or same as local interfaces. See code in parseClassFile.
531 Array<InstanceKlass*>* ti = transitive_interfaces;
532 if (ti != Universe::the_empty_instance_klass_array() && ti != local_interfaces) {
533 // check that the interfaces don't come from super class
534 Array<InstanceKlass*>* sti = (super_klass == NULL) ? NULL :
535 InstanceKlass::cast(super_klass)->transitive_interfaces();
536 if (ti != sti && ti != NULL && !ti->is_shared()) {
537 MetadataFactory::free_array<InstanceKlass*>(loader_data, ti);
538 }
539 }
540
541 // local interfaces can be empty
542 if (local_interfaces != Universe::the_empty_instance_klass_array() &&
543 local_interfaces != NULL && !local_interfaces->is_shared()) {
544 MetadataFactory::free_array<InstanceKlass*>(loader_data, local_interfaces);
545 }
546 }
547
548 // This function deallocates the metadata and C heap pointers that the
549 // InstanceKlass points to.
550 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
551
552 // Orphan the mirror first, CMS thinks it's still live.
553 if (java_mirror() != NULL) {
554 java_lang_Class::set_klass(java_mirror(), NULL);
555 }
556
557 // Also remove mirror from handles
558 loader_data->remove_handle(_java_mirror);
559
560 // Need to take this class off the class loader data list.
561 loader_data->remove_class(this);
562
563 // The array_klass for this class is created later, after error handling.
564 // For class redefinition, we keep the original class so this scratch class
565 // doesn't have an array class. Either way, assert that there is nothing
566 // to deallocate.
567 assert(array_klasses() == NULL, "array classes shouldn't be created for this class yet");
568
569 // Release C heap allocated data that this might point to, which includes
570 // reference counting symbol names.
571 release_C_heap_structures();
572
573 deallocate_methods(loader_data, methods());
574 set_methods(NULL);
575
576 if (method_ordering() != NULL &&
577 method_ordering() != Universe::the_empty_int_array() &&
578 !method_ordering()->is_shared()) {
579 MetadataFactory::free_array<int>(loader_data, method_ordering());
580 }
581 set_method_ordering(NULL);
582
583 // default methods can be empty
584 if (default_methods() != NULL &&
585 default_methods() != Universe::the_empty_method_array() &&
586 !default_methods()->is_shared()) {
587 MetadataFactory::free_array<Method*>(loader_data, default_methods());
588 }
589 // Do NOT deallocate the default methods, they are owned by superinterfaces.
590 set_default_methods(NULL);
591
592 // default methods vtable indices can be empty
593 if (default_vtable_indices() != NULL &&
594 !default_vtable_indices()->is_shared()) {
595 MetadataFactory::free_array<int>(loader_data, default_vtable_indices());
596 }
597 set_default_vtable_indices(NULL);
598
599
600 // This array is in Klass, but remove it with the InstanceKlass since
601 // this place would be the only caller and it can share memory with transitive
602 // interfaces.
603 if (secondary_supers() != NULL &&
604 secondary_supers() != Universe::the_empty_klass_array() &&
605 // see comments in compute_secondary_supers about the following cast
606 (address)(secondary_supers()) != (address)(transitive_interfaces()) &&
607 !secondary_supers()->is_shared()) {
608 MetadataFactory::free_array<Klass*>(loader_data, secondary_supers());
609 }
610 set_secondary_supers(NULL);
611
612 deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces());
613 set_transitive_interfaces(NULL);
614 set_local_interfaces(NULL);
615
616 if (fields() != NULL && !fields()->is_shared()) {
617 MetadataFactory::free_array<jushort>(loader_data, fields());
618 }
619 set_fields(NULL, 0);
620
621 // If a method from a redefined class is using this constant pool, don't
622 // delete it, yet. The new class's previous version will point to this.
623 if (constants() != NULL) {
624 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack");
625 if (!constants()->is_shared()) {
626 MetadataFactory::free_metadata(loader_data, constants());
627 }
628 // Delete any cached resolution errors for the constant pool
629 SystemDictionary::delete_resolution_error(constants());
630
631 set_constants(NULL);
632 }
633
634 if (inner_classes() != NULL &&
635 inner_classes() != Universe::the_empty_short_array() &&
636 !inner_classes()->is_shared()) {
637 MetadataFactory::free_array<jushort>(loader_data, inner_classes());
638 }
639 set_inner_classes(NULL);
640
641 if (nest_members() != NULL &&
642 nest_members() != Universe::the_empty_short_array() &&
643 !nest_members()->is_shared()) {
644 MetadataFactory::free_array<jushort>(loader_data, nest_members());
645 }
646 set_nest_members(NULL);
647
648 // We should deallocate the Annotations instance if it's not in shared spaces.
649 if (annotations() != NULL && !annotations()->is_shared()) {
650 MetadataFactory::free_metadata(loader_data, annotations());
651 }
652 set_annotations(NULL);
653
654 if (Arguments::is_dumping_archive()) {
655 SystemDictionaryShared::remove_dumptime_info(this);
656 }
657 }
658
659 bool InstanceKlass::should_be_initialized() const {
660 return !is_initialized();
661 }
662
663 klassItable InstanceKlass::itable() const {
664 return klassItable(const_cast<InstanceKlass*>(this));
665 }
666
667 void InstanceKlass::eager_initialize(Thread *thread) {
668 if (!EagerInitialization) return;
669
670 if (this->is_not_initialized()) {
671 // abort if the the class has a class initializer
672 if (this->class_initializer() != NULL) return;
673
674 // abort if it is java.lang.Object (initialization is handled in genesis)
675 Klass* super_klass = super();
676 if (super_klass == NULL) return;
677
678 // abort if the super class should be initialized
679 if (!InstanceKlass::cast(super_klass)->is_initialized()) return;
680
681 // call body to expose the this pointer
682 eager_initialize_impl();
683 }
684 }
685
686 // JVMTI spec thinks there are signers and protection domain in the
687 // instanceKlass. These accessors pretend these fields are there.
688 // The hprof specification also thinks these fields are in InstanceKlass.
689 oop InstanceKlass::protection_domain() const {
690 // return the protection_domain from the mirror
691 return java_lang_Class::protection_domain(java_mirror());
692 }
693
694 // To remove these from requires an incompatible change and CCC request.
695 objArrayOop InstanceKlass::signers() const {
696 // return the signers from the mirror
697 return java_lang_Class::signers(java_mirror());
698 }
699
700 oop InstanceKlass::init_lock() const {
701 // return the init lock from the mirror
702 oop lock = java_lang_Class::init_lock(java_mirror());
703 // Prevent reordering with any access of initialization state
704 OrderAccess::loadload();
705 assert((oop)lock != NULL || !is_not_initialized(), // initialized or in_error state
706 "only fully initialized state can have a null lock");
707 return lock;
708 }
709
710 // Set the initialization lock to null so the object can be GC'ed. Any racing
711 // threads to get this lock will see a null lock and will not lock.
712 // That's okay because they all check for initialized state after getting
713 // the lock and return.
714 void InstanceKlass::fence_and_clear_init_lock() {
715 // make sure previous stores are all done, notably the init_state.
716 OrderAccess::storestore();
717 java_lang_Class::set_init_lock(java_mirror(), NULL);
718 assert(!is_not_initialized(), "class must be initialized now");
719 }
720
721 void InstanceKlass::eager_initialize_impl() {
722 EXCEPTION_MARK;
723 HandleMark hm(THREAD);
724 Handle h_init_lock(THREAD, init_lock());
725 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
726
727 // abort if someone beat us to the initialization
728 if (!is_not_initialized()) return; // note: not equivalent to is_initialized()
729
730 ClassState old_state = init_state();
731 link_class_impl(THREAD);
732 if (HAS_PENDING_EXCEPTION) {
733 CLEAR_PENDING_EXCEPTION;
734 // Abort if linking the class throws an exception.
735
736 // Use a test to avoid redundantly resetting the state if there's
737 // no change. Set_init_state() asserts that state changes make
738 // progress, whereas here we might just be spinning in place.
739 if (old_state != _init_state)
740 set_init_state(old_state);
741 } else {
742 // linking successfull, mark class as initialized
743 set_init_state(fully_initialized);
744 fence_and_clear_init_lock();
745 // trace
746 if (log_is_enabled(Info, class, init)) {
747 ResourceMark rm(THREAD);
748 log_info(class, init)("[Initialized %s without side effects]", external_name());
749 }
750 }
751 }
752
753
754 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization
755 // process. The step comments refers to the procedure described in that section.
756 // Note: implementation moved to static method to expose the this pointer.
757 void InstanceKlass::initialize(TRAPS) {
758 if (this->should_be_initialized()) {
759 initialize_impl(CHECK);
760 // Note: at this point the class may be initialized
761 // OR it may be in the state of being initialized
762 // in case of recursive initialization!
763 } else {
764 assert(is_initialized(), "sanity check");
765 }
766 }
767
768
769 bool InstanceKlass::verify_code(TRAPS) {
770 // 1) Verify the bytecodes
771 return Verifier::verify(this, should_verify_class(), THREAD);
772 }
773
774 void InstanceKlass::link_class(TRAPS) {
775 assert(is_loaded(), "must be loaded");
776 if (!is_linked()) {
777 link_class_impl(CHECK);
778 }
779 }
780
781 // Called to verify that a class can link during initialization, without
782 // throwing a VerifyError.
783 bool InstanceKlass::link_class_or_fail(TRAPS) {
784 assert(is_loaded(), "must be loaded");
785 if (!is_linked()) {
786 link_class_impl(CHECK_false);
787 }
788 return is_linked();
789 }
790
791 bool InstanceKlass::link_class_impl(TRAPS) {
792 if (DumpSharedSpaces && is_in_error_state()) {
793 // This is for CDS dumping phase only -- we use the in_error_state to indicate that
794 // the class has failed verification. Throwing the NoClassDefFoundError here is just
795 // a convenient way to stop repeat attempts to verify the same (bad) class.
796 //
797 // Note that the NoClassDefFoundError is not part of the JLS, and should not be thrown
798 // if we are executing Java code. This is not a problem for CDS dumping phase since
799 // it doesn't execute any Java code.
800 ResourceMark rm(THREAD);
801 Exceptions::fthrow(THREAD_AND_LOCATION,
802 vmSymbols::java_lang_NoClassDefFoundError(),
803 "Class %s, or one of its supertypes, failed class initialization",
804 external_name());
805 return false;
806 }
807 // return if already verified
808 if (is_linked()) {
809 return true;
810 }
811
812 // Timing
813 // timer handles recursion
814 assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl");
815 JavaThread* jt = (JavaThread*)THREAD;
816
817 // link super class before linking this class
818 Klass* super_klass = super();
819 if (super_klass != NULL) {
820 if (super_klass->is_interface()) { // check if super class is an interface
821 ResourceMark rm(THREAD);
822 Exceptions::fthrow(
823 THREAD_AND_LOCATION,
824 vmSymbols::java_lang_IncompatibleClassChangeError(),
825 "class %s has interface %s as super class",
826 external_name(),
827 super_klass->external_name()
828 );
829 return false;
830 }
831
832 InstanceKlass* ik_super = InstanceKlass::cast(super_klass);
833 ik_super->link_class_impl(CHECK_false);
834 }
835
836 // link all interfaces implemented by this class before linking this class
837 Array<InstanceKlass*>* interfaces = local_interfaces();
838 int num_interfaces = interfaces->length();
839 for (int index = 0; index < num_interfaces; index++) {
840 InstanceKlass* interk = interfaces->at(index);
841 interk->link_class_impl(CHECK_false);
842 }
843
844
845 // If a class declares a method that uses a value class as an argument
846 // type or return value type, this value class must be loaded during the
847 // linking of this class because size and properties of the value class
848 // must be known in order to be able to perform value type optimizations.
849 // The implementation below is an approximation of this rule, the code
850 // iterates over all methods of the current class (including overridden
851 // methods), not only the methods declared by this class. This
852 // approximation makes the code simpler, and doesn't change the semantic
853 // because classes declaring methods overridden by the current class are
854 // linked (and have performed their own pre-loading) before the linking
855 // of the current class.
856 // This is also the moment to detect potential mismatch between the
857 // ValueTypes attribute and the kind of the class effectively loaded.
858
859
860 // Note:
861 // Value class types used for flattenable fields are loaded during
862 // the loading phase (see ClassFileParser::post_process_parsed_stream()).
863 // Value class types used as element types for array creation
864 // are not pre-loaded. Their loading is triggered by either anewarray
865 // or multianewarray bytecodes.
866
867 // Could it be possible to do the following processing only if the
868 // class uses value types?
869 {
870 ResourceMark rm(THREAD);
871 for (int i = 0; i < methods()->length(); i++) {
872 Method* m = methods()->at(i);
873 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
874 Symbol* sig = ss.as_symbol();
875 if (ss.is_object()) {
876 Symbol* symb = sig;
877 if (ss.is_array()) {
878 int i=0;
879 while (sig->char_at(i) == '[') i++;
880 if (i == sig->utf8_length() - 1 ) continue; // primitive array
881 symb = SymbolTable::new_symbol(sig->as_C_string() + i + 1,
882 sig->utf8_length() - 3);
883 }
884 if (ss.type() == T_VALUETYPE) {
885 oop loader = class_loader();
886 oop protection_domain = this->protection_domain();
887 Klass* klass = SystemDictionary::resolve_or_fail(symb,
888 Handle(THREAD, loader), Handle(THREAD, protection_domain), true,
889 CHECK_false);
890 if (symb != sig) {
891 symb->decrement_refcount();
892 }
893 if (klass == NULL) {
894 THROW_(vmSymbols::java_lang_LinkageError(), false);
895 }
896 if (!klass->is_value()) {
897 THROW_(vmSymbols::java_lang_IncompatibleClassChangeError(), false);
898 }
899 }
900 }
901 }
902 }
903 }
904
905 // in case the class is linked in the process of linking its superclasses
906 if (is_linked()) {
907 return true;
908 }
909
910 // trace only the link time for this klass that includes
911 // the verification time
912 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
913 ClassLoader::perf_class_link_selftime(),
914 ClassLoader::perf_classes_linked(),
915 jt->get_thread_stat()->perf_recursion_counts_addr(),
916 jt->get_thread_stat()->perf_timers_addr(),
917 PerfClassTraceTime::CLASS_LINK);
918
919 // verification & rewriting
920 {
921 HandleMark hm(THREAD);
922 Handle h_init_lock(THREAD, init_lock());
923 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
924 // rewritten will have been set if loader constraint error found
925 // on an earlier link attempt
926 // don't verify or rewrite if already rewritten
927 //
928
929 if (!is_linked()) {
930 if (!is_rewritten()) {
931 {
932 bool verify_ok = verify_code(THREAD);
933 if (!verify_ok) {
934 return false;
935 }
936 }
937
938 // Just in case a side-effect of verify linked this class already
939 // (which can sometimes happen since the verifier loads classes
940 // using custom class loaders, which are free to initialize things)
941 if (is_linked()) {
942 return true;
943 }
944
945 // also sets rewritten
946 rewrite_class(CHECK_false);
947 } else if (is_shared()) {
948 SystemDictionaryShared::check_verification_constraints(this, CHECK_false);
949 }
950
951 // relocate jsrs and link methods after they are all rewritten
952 link_methods(CHECK_false);
953
954 // Initialize the vtable and interface table after
955 // methods have been rewritten since rewrite may
956 // fabricate new Method*s.
957 // also does loader constraint checking
958 //
959 // initialize_vtable and initialize_itable need to be rerun for
960 // a shared class if the class is not loaded by the NULL classloader.
961 ClassLoaderData * loader_data = class_loader_data();
962 if (!(is_shared() &&
963 loader_data->is_the_null_class_loader_data())) {
964 vtable().initialize_vtable(true, CHECK_false);
965 itable().initialize_itable(true, CHECK_false);
966 }
967 #ifdef ASSERT
968 else {
969 vtable().verify(tty, true);
970 // In case itable verification is ever added.
971 // itable().verify(tty, true);
972 }
973 #endif
974
975 set_init_state(linked);
976 if (JvmtiExport::should_post_class_prepare()) {
977 Thread *thread = THREAD;
978 assert(thread->is_Java_thread(), "thread->is_Java_thread()");
979 JvmtiExport::post_class_prepare((JavaThread *) thread, this);
980 }
981 }
982 }
983 return true;
984 }
985
986 // Rewrite the byte codes of all of the methods of a class.
987 // The rewriter must be called exactly once. Rewriting must happen after
988 // verification but before the first method of the class is executed.
989 void InstanceKlass::rewrite_class(TRAPS) {
990 assert(is_loaded(), "must be loaded");
991 if (is_rewritten()) {
992 assert(is_shared(), "rewriting an unshared class?");
993 return;
994 }
995 Rewriter::rewrite(this, CHECK);
996 set_rewritten();
997 }
998
999 // Now relocate and link method entry points after class is rewritten.
1000 // This is outside is_rewritten flag. In case of an exception, it can be
1001 // executed more than once.
1002 void InstanceKlass::link_methods(TRAPS) {
1003 int len = methods()->length();
1004 for (int i = len-1; i >= 0; i--) {
1005 methodHandle m(THREAD, methods()->at(i));
1006
1007 // Set up method entry points for compiler and interpreter .
1008 m->link_method(m, CHECK);
1009 }
1010 }
1011
1012 // Eagerly initialize superinterfaces that declare default methods (concrete instance: any access)
1013 void InstanceKlass::initialize_super_interfaces(TRAPS) {
1014 assert (has_nonstatic_concrete_methods(), "caller should have checked this");
1015 for (int i = 0; i < local_interfaces()->length(); ++i) {
1016 InstanceKlass* ik = local_interfaces()->at(i);
1017
1018 // Initialization is depth first search ie. we start with top of the inheritance tree
1019 // has_nonstatic_concrete_methods drives searching superinterfaces since it
1020 // means has_nonstatic_concrete_methods in its superinterface hierarchy
1021 if (ik->has_nonstatic_concrete_methods()) {
1022 ik->initialize_super_interfaces(CHECK);
1023 }
1024
1025 // Only initialize() interfaces that "declare" concrete methods.
1026 if (ik->should_be_initialized() && ik->declares_nonstatic_concrete_methods()) {
1027 ik->initialize(CHECK);
1028 }
1029 }
1030 }
1031
1032 void InstanceKlass::initialize_impl(TRAPS) {
1033 HandleMark hm(THREAD);
1034
1035 // Make sure klass is linked (verified) before initialization
1036 // A class could already be verified, since it has been reflected upon.
1037 link_class(CHECK);
1038
1039 DTRACE_CLASSINIT_PROBE(required, -1);
1040
1041 bool wait = false;
1042
1043 assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl");
1044 JavaThread* jt = (JavaThread*)THREAD;
1045
1046 // refer to the JVM book page 47 for description of steps
1047 // Step 1
1048 {
1049 Handle h_init_lock(THREAD, init_lock());
1050 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
1051
1052 // Step 2
1053 // If we were to use wait() instead of waitInterruptibly() then
1054 // we might end up throwing IE from link/symbol resolution sites
1055 // that aren't expected to throw. This would wreak havoc. See 6320309.
1056 while (is_being_initialized() && !is_reentrant_initialization(jt)) {
1057 wait = true;
1058 jt->set_class_to_be_initialized(this);
1059 ol.wait_uninterruptibly(jt);
1060 jt->set_class_to_be_initialized(NULL);
1061 }
1062
1063 // Step 3
1064 if (is_being_initialized() && is_reentrant_initialization(jt)) {
1065 DTRACE_CLASSINIT_PROBE_WAIT(recursive, -1, wait);
1066 return;
1067 }
1068
1069 // Step 4
1070 if (is_initialized()) {
1071 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, -1, wait);
1072 return;
1073 }
1074
1075 // Step 5
1076 if (is_in_error_state()) {
1077 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait);
1078 ResourceMark rm(THREAD);
1079 const char* desc = "Could not initialize class ";
1080 const char* className = external_name();
1081 size_t msglen = strlen(desc) + strlen(className) + 1;
1082 char* message = NEW_RESOURCE_ARRAY(char, msglen);
1083 if (NULL == message) {
1084 // Out of memory: can't create detailed error message
1085 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className);
1086 } else {
1087 jio_snprintf(message, msglen, "%s%s", desc, className);
1088 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message);
1089 }
1090 }
1091
1092 // Step 6
1093 set_init_state(being_initialized);
1094 set_init_thread(jt);
1095 }
1096
1097 // Step 7
1098 // Next, if C is a class rather than an interface, initialize it's super class and super
1099 // interfaces.
1100 if (!is_interface()) {
1101 Klass* super_klass = super();
1102 if (super_klass != NULL && super_klass->should_be_initialized()) {
1103 super_klass->initialize(THREAD);
1104 }
1105 // If C implements any interface that declares a non-static, concrete method,
1106 // the initialization of C triggers initialization of its super interfaces.
1107 // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and
1108 // having a superinterface that declares, non-static, concrete methods
1109 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) {
1110 initialize_super_interfaces(THREAD);
1111 }
1112
1113 // If any exceptions, complete abruptly, throwing the same exception as above.
1114 if (HAS_PENDING_EXCEPTION) {
1115 Handle e(THREAD, PENDING_EXCEPTION);
1116 CLEAR_PENDING_EXCEPTION;
1117 {
1118 EXCEPTION_MARK;
1119 // Locks object, set state, and notify all waiting threads
1120 set_initialization_state_and_notify(initialization_error, THREAD);
1121 CLEAR_PENDING_EXCEPTION;
1122 }
1123 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait);
1124 THROW_OOP(e());
1125 }
1126 }
1127
1128 // Step 8
1129 // Initialize classes of flattenable fields
1130 {
1131 for (AllFieldStream fs(this); !fs.done(); fs.next()) {
1132 if (fs.is_flattenable()) {
1133 Klass* klass = this->get_value_field_klass_or_null(fs.index());
1134 if (klass == NULL) {
1135 assert(fs.access_flags().is_static() && fs.access_flags().is_flattenable(),
1136 "Otherwise should have been pre-loaded");
1137 klass = SystemDictionary::resolve_or_fail(field_signature(fs.index())->fundamental_name(THREAD),
1138 Handle(THREAD, class_loader()),
1139 Handle(THREAD, protection_domain()),
1140 true, CHECK);
1141 if (klass == NULL) {
1142 THROW(vmSymbols::java_lang_NoClassDefFoundError());
1143 }
1144 if (!klass->is_value()) {
1145 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
1146 }
1147 this->set_value_field_klass(fs.index(), klass);
1148 }
1149 InstanceKlass::cast(klass)->initialize(CHECK);
1150 if (fs.access_flags().is_static()) {
1151 if (java_mirror()->obj_field(fs.offset()) == NULL) {
1152 java_mirror()->obj_field_put(fs.offset(), ValueKlass::cast(klass)->default_value());
1153 }
1154 }
1155 }
1156 }
1157 }
1158
1159
1160 // Look for aot compiled methods for this klass, including class initializer.
1161 AOTLoader::load_for_klass(this, THREAD);
1162
1163 // Step 9
1164 {
1165 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
1166 // Timer includes any side effects of class initialization (resolution,
1167 // etc), but not recursive entry into call_class_initializer().
1168 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
1169 ClassLoader::perf_class_init_selftime(),
1170 ClassLoader::perf_classes_inited(),
1171 jt->get_thread_stat()->perf_recursion_counts_addr(),
1172 jt->get_thread_stat()->perf_timers_addr(),
1173 PerfClassTraceTime::CLASS_CLINIT);
1174 call_class_initializer(THREAD);
1175 }
1176
1177 // Step 10
1178 if (!HAS_PENDING_EXCEPTION) {
1179 set_initialization_state_and_notify(fully_initialized, CHECK);
1180 {
1181 debug_only(vtable().verify(tty, true);)
1182 }
1183 }
1184 else {
1185 // Step 11 and 12
1186 Handle e(THREAD, PENDING_EXCEPTION);
1187 CLEAR_PENDING_EXCEPTION;
1188 // JVMTI has already reported the pending exception
1189 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1190 JvmtiExport::clear_detected_exception(jt);
1191 {
1192 EXCEPTION_MARK;
1193 set_initialization_state_and_notify(initialization_error, THREAD);
1194 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below
1195 // JVMTI has already reported the pending exception
1196 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1197 JvmtiExport::clear_detected_exception(jt);
1198 }
1199 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
1200 if (e->is_a(SystemDictionary::Error_klass())) {
1201 THROW_OOP(e());
1202 } else {
1203 JavaCallArguments args(e);
1204 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
1205 vmSymbols::throwable_void_signature(),
1206 &args);
1207 }
1208 }
1209 DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait);
1210 }
1211
1212
1213 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) {
1214 Handle h_init_lock(THREAD, init_lock());
1215 if (h_init_lock() != NULL) {
1216 ObjectLocker ol(h_init_lock, THREAD);
1217 set_init_thread(NULL); // reset _init_thread before changing _init_state
1218 set_init_state(state);
1219 fence_and_clear_init_lock();
1220 ol.notify_all(CHECK);
1221 } else {
1222 assert(h_init_lock() != NULL, "The initialization state should never be set twice");
1223 set_init_thread(NULL); // reset _init_thread before changing _init_state
1224 set_init_state(state);
1225 }
1226 }
1227
1228 Klass* InstanceKlass::implementor() const {
1229 Klass* volatile* k = adr_implementor();
1230 if (k == NULL) {
1231 return NULL;
1232 } else {
1233 // This load races with inserts, and therefore needs acquire.
1234 Klass* kls = OrderAccess::load_acquire(k);
1235 if (kls != NULL && !kls->is_loader_alive()) {
1236 return NULL; // don't return unloaded class
1237 } else {
1238 return kls;
1239 }
1240 }
1241 }
1242
1243
1244 void InstanceKlass::set_implementor(Klass* k) {
1245 assert_locked_or_safepoint(Compile_lock);
1246 assert(is_interface(), "not interface");
1247 Klass* volatile* addr = adr_implementor();
1248 assert(addr != NULL, "null addr");
1249 if (addr != NULL) {
1250 OrderAccess::release_store(addr, k);
1251 }
1252 }
1253
1254 int InstanceKlass::nof_implementors() const {
1255 Klass* k = implementor();
1256 if (k == NULL) {
1257 return 0;
1258 } else if (k != this) {
1259 return 1;
1260 } else {
1261 return 2;
1262 }
1263 }
1264
1265 // The embedded _implementor field can only record one implementor.
1266 // When there are more than one implementors, the _implementor field
1267 // is set to the interface Klass* itself. Following are the possible
1268 // values for the _implementor field:
1269 // NULL - no implementor
1270 // implementor Klass* - one implementor
1271 // self - more than one implementor
1272 //
1273 // The _implementor field only exists for interfaces.
1274 void InstanceKlass::add_implementor(Klass* k) {
1275 assert_lock_strong(Compile_lock);
1276 assert(is_interface(), "not interface");
1277 // Filter out my subinterfaces.
1278 // (Note: Interfaces are never on the subklass list.)
1279 if (InstanceKlass::cast(k)->is_interface()) return;
1280
1281 // Filter out subclasses whose supers already implement me.
1282 // (Note: CHA must walk subclasses of direct implementors
1283 // in order to locate indirect implementors.)
1284 Klass* sk = k->super();
1285 if (sk != NULL && InstanceKlass::cast(sk)->implements_interface(this))
1286 // We only need to check one immediate superclass, since the
1287 // implements_interface query looks at transitive_interfaces.
1288 // Any supers of the super have the same (or fewer) transitive_interfaces.
1289 return;
1290
1291 Klass* ik = implementor();
1292 if (ik == NULL) {
1293 set_implementor(k);
1294 } else if (ik != this) {
1295 // There is already an implementor. Use itself as an indicator of
1296 // more than one implementors.
1297 set_implementor(this);
1298 }
1299
1300 // The implementor also implements the transitive_interfaces
1301 for (int index = 0; index < local_interfaces()->length(); index++) {
1302 InstanceKlass::cast(local_interfaces()->at(index))->add_implementor(k);
1303 }
1304 }
1305
1306 void InstanceKlass::init_implementor() {
1307 if (is_interface()) {
1308 set_implementor(NULL);
1309 }
1310 }
1311
1312
1313 void InstanceKlass::process_interfaces(Thread *thread) {
1314 // link this class into the implementors list of every interface it implements
1315 for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
1316 assert(local_interfaces()->at(i)->is_klass(), "must be a klass");
1317 InstanceKlass* interf = InstanceKlass::cast(local_interfaces()->at(i));
1318 assert(interf->is_interface(), "expected interface");
1319 interf->add_implementor(this);
1320 }
1321 }
1322
1323 bool InstanceKlass::can_be_primary_super_slow() const {
1324 if (is_interface())
1325 return false;
1326 else
1327 return Klass::can_be_primary_super_slow();
1328 }
1329
1330 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots,
1331 Array<InstanceKlass*>* transitive_interfaces) {
1332 // The secondaries are the implemented interfaces.
1333 Array<InstanceKlass*>* interfaces = transitive_interfaces;
1334 int num_secondaries = num_extra_slots + interfaces->length();
1335 if (num_secondaries == 0) {
1336 // Must share this for correct bootstrapping!
1337 set_secondary_supers(Universe::the_empty_klass_array());
1338 return NULL;
1339 } else if (num_extra_slots == 0) {
1340 // The secondary super list is exactly the same as the transitive interfaces, so
1341 // let's use it instead of making a copy.
1342 // Redefine classes has to be careful not to delete this!
1343 // We need the cast because Array<Klass*> is NOT a supertype of Array<InstanceKlass*>,
1344 // (but it's safe to do here because we won't write into _secondary_supers from this point on).
1345 set_secondary_supers((Array<Klass*>*)(address)interfaces);
1346 return NULL;
1347 } else {
1348 // Copy transitive interfaces to a temporary growable array to be constructed
1349 // into the secondary super list with extra slots.
1350 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length());
1351 for (int i = 0; i < interfaces->length(); i++) {
1352 secondaries->push(interfaces->at(i));
1353 }
1354 return secondaries;
1355 }
1356 }
1357
1358 bool InstanceKlass::implements_interface(Klass* k) const {
1359 if (this == k) return true;
1360 assert(k->is_interface(), "should be an interface class");
1361 for (int i = 0; i < transitive_interfaces()->length(); i++) {
1362 if (transitive_interfaces()->at(i) == k) {
1363 return true;
1364 }
1365 }
1366 return false;
1367 }
1368
1369 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const {
1370 // Verify direct super interface
1371 if (this == k) return true;
1372 assert(k->is_interface(), "should be an interface class");
1373 for (int i = 0; i < local_interfaces()->length(); i++) {
1374 if (local_interfaces()->at(i) == k) {
1375 return true;
1376 }
1377 }
1378 return false;
1379 }
1380
1381 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) {
1382 check_array_allocation_length(length, arrayOopDesc::max_array_length(T_OBJECT), CHECK_NULL);
1383 int size = objArrayOopDesc::object_size(length);
1384 Klass* ak = array_klass(n, CHECK_NULL);
1385 objArrayOop o = (objArrayOop)Universe::heap()->array_allocate(ak, size, length,
1386 /* do_zero */ true, CHECK_NULL);
1387 return o;
1388 }
1389
1390 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
1391 if (TraceFinalizerRegistration) {
1392 tty->print("Registered ");
1393 i->print_value_on(tty);
1394 tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", p2i(i));
1395 }
1396 instanceHandle h_i(THREAD, i);
1397 // Pass the handle as argument, JavaCalls::call expects oop as jobjects
1398 JavaValue result(T_VOID);
1399 JavaCallArguments args(h_i);
1400 methodHandle mh (THREAD, Universe::finalizer_register_method());
1401 JavaCalls::call(&result, mh, &args, CHECK_NULL);
1402 return h_i();
1403 }
1404
1405 instanceOop InstanceKlass::allocate_instance(TRAPS) {
1406 bool has_finalizer_flag = has_finalizer(); // Query before possible GC
1407 int size = size_helper(); // Query before forming handle.
1408
1409 instanceOop i;
1410
1411 i = (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL);
1412 if (has_finalizer_flag && !RegisterFinalizersAtInit) {
1413 i = register_finalizer(i, CHECK_NULL);
1414 }
1415 return i;
1416 }
1417
1418 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) {
1419 return instanceHandle(THREAD, allocate_instance(THREAD));
1420 }
1421
1422 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1423 if (is_interface() || is_abstract()) {
1424 ResourceMark rm(THREAD);
1425 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1426 : vmSymbols::java_lang_InstantiationException(), external_name());
1427 }
1428 if (this == SystemDictionary::Class_klass()) {
1429 ResourceMark rm(THREAD);
1430 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1431 : vmSymbols::java_lang_IllegalAccessException(), external_name());
1432 }
1433 }
1434
1435 Klass* InstanceKlass::array_klass_impl(ArrayStorageProperties storage_props, bool or_null, int n, TRAPS) {
1436 assert(storage_props.is_empty(), "Unexpected");
1437 // Need load-acquire for lock-free read
1438 if (array_klasses_acquire() == NULL) {
1439 if (or_null) return NULL;
1440
1441 ResourceMark rm;
1442 {
1443 // Atomic creation of array_klasses
1444 MutexLocker ma(MultiArray_lock, THREAD);
1445
1446 // Check if update has already taken place
1447 if (array_klasses() == NULL) {
1448 Klass* k = ObjArrayKlass::allocate_objArray_klass(storage_props, 1, this, CHECK_NULL);
1449 // use 'release' to pair with lock-free load
1450 release_set_array_klasses(k);
1451 }
1452 }
1453 }
1454 // _this will always be set at this point
1455 ObjArrayKlass* oak = (ObjArrayKlass*)array_klasses();
1456 if (or_null) {
1457 return oak->array_klass_or_null(storage_props, n);
1458 }
1459 return oak->array_klass(storage_props, n, THREAD);
1460 }
1461
1462 Klass* InstanceKlass::array_klass_impl(ArrayStorageProperties storage_props, bool or_null, TRAPS) {
1463 return array_klass_impl(storage_props, or_null, 1, THREAD);
1464 }
1465
1466 static int call_class_initializer_counter = 0; // for debugging
1467
1468 Method* InstanceKlass::class_initializer() const {
1469 Method* clinit = find_method(
1470 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1471 if (clinit != NULL && clinit->is_class_initializer()) {
1472 return clinit;
1473 }
1474 return NULL;
1475 }
1476
1477 void InstanceKlass::call_class_initializer(TRAPS) {
1478 if (ReplayCompiles &&
1479 (ReplaySuppressInitializers == 1 ||
1480 (ReplaySuppressInitializers >= 2 && class_loader() != NULL))) {
1481 // Hide the existence of the initializer for the purpose of replaying the compile
1482 return;
1483 }
1484
1485 methodHandle h_method(THREAD, class_initializer());
1486 assert(!is_initialized(), "we cannot initialize twice");
1487 LogTarget(Info, class, init) lt;
1488 if (lt.is_enabled()) {
1489 ResourceMark rm;
1490 LogStream ls(lt);
1491 ls.print("%d Initializing ", call_class_initializer_counter++);
1492 name()->print_value_on(&ls);
1493 ls.print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", p2i(this));
1494 }
1495 if (h_method() != NULL) {
1496 JavaCallArguments args; // No arguments
1497 JavaValue result(T_VOID);
1498 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1499 }
1500 }
1501
1502
1503 void InstanceKlass::mask_for(const methodHandle& method, int bci,
1504 InterpreterOopMap* entry_for) {
1505 // Lazily create the _oop_map_cache at first request
1506 // Lock-free access requires load_acquire.
1507 OopMapCache* oop_map_cache = OrderAccess::load_acquire(&_oop_map_cache);
1508 if (oop_map_cache == NULL) {
1509 MutexLocker x(OopMapCacheAlloc_lock, Mutex::_no_safepoint_check_flag);
1510 // Check if _oop_map_cache was allocated while we were waiting for this lock
1511 if ((oop_map_cache = _oop_map_cache) == NULL) {
1512 oop_map_cache = new OopMapCache();
1513 // Ensure _oop_map_cache is stable, since it is examined without a lock
1514 OrderAccess::release_store(&_oop_map_cache, oop_map_cache);
1515 }
1516 }
1517 // _oop_map_cache is constant after init; lookup below does its own locking.
1518 oop_map_cache->lookup(method, bci, entry_for);
1519 }
1520
1521
1522 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1523 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1524 Symbol* f_name = fs.name();
1525 Symbol* f_sig = fs.signature();
1526 if (f_name == name && f_sig == sig) {
1527 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1528 return true;
1529 }
1530 }
1531 return false;
1532 }
1533
1534
1535 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1536 const int n = local_interfaces()->length();
1537 for (int i = 0; i < n; i++) {
1538 Klass* intf1 = local_interfaces()->at(i);
1539 assert(intf1->is_interface(), "just checking type");
1540 // search for field in current interface
1541 if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) {
1542 assert(fd->is_static(), "interface field must be static");
1543 return intf1;
1544 }
1545 // search for field in direct superinterfaces
1546 Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd);
1547 if (intf2 != NULL) return intf2;
1548 }
1549 // otherwise field lookup fails
1550 return NULL;
1551 }
1552
1553
1554 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1555 // search order according to newest JVM spec (5.4.3.2, p.167).
1556 // 1) search for field in current klass
1557 if (find_local_field(name, sig, fd)) {
1558 return const_cast<InstanceKlass*>(this);
1559 }
1560 // 2) search for field recursively in direct superinterfaces
1561 { Klass* intf = find_interface_field(name, sig, fd);
1562 if (intf != NULL) return intf;
1563 }
1564 // 3) apply field lookup recursively if superclass exists
1565 { Klass* supr = super();
1566 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, fd);
1567 }
1568 // 4) otherwise field lookup fails
1569 return NULL;
1570 }
1571
1572
1573 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
1574 // search order according to newest JVM spec (5.4.3.2, p.167).
1575 // 1) search for field in current klass
1576 if (find_local_field(name, sig, fd)) {
1577 if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
1578 }
1579 // 2) search for field recursively in direct superinterfaces
1580 if (is_static) {
1581 Klass* intf = find_interface_field(name, sig, fd);
1582 if (intf != NULL) return intf;
1583 }
1584 // 3) apply field lookup recursively if superclass exists
1585 { Klass* supr = super();
1586 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd);
1587 }
1588 // 4) otherwise field lookup fails
1589 return NULL;
1590 }
1591
1592
1593 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1594 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1595 if (fs.offset() == offset) {
1596 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1597 if (fd->is_static() == is_static) return true;
1598 }
1599 }
1600 return false;
1601 }
1602
1603
1604 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1605 Klass* klass = const_cast<InstanceKlass*>(this);
1606 while (klass != NULL) {
1607 if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) {
1608 return true;
1609 }
1610 klass = klass->super();
1611 }
1612 return false;
1613 }
1614
1615
1616 void InstanceKlass::methods_do(void f(Method* method)) {
1617 // Methods aren't stable until they are loaded. This can be read outside
1618 // a lock through the ClassLoaderData for profiling
1619 if (!is_loaded()) {
1620 return;
1621 }
1622
1623 int len = methods()->length();
1624 for (int index = 0; index < len; index++) {
1625 Method* m = methods()->at(index);
1626 assert(m->is_method(), "must be method");
1627 f(m);
1628 }
1629 }
1630
1631
1632 void InstanceKlass::do_local_static_fields(FieldClosure* cl) {
1633 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1634 if (fs.access_flags().is_static()) {
1635 fieldDescriptor& fd = fs.field_descriptor();
1636 cl->do_field(&fd);
1637 }
1638 }
1639 }
1640
1641
1642 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) {
1643 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1644 if (fs.access_flags().is_static()) {
1645 fieldDescriptor& fd = fs.field_descriptor();
1646 f(&fd, mirror, CHECK);
1647 }
1648 }
1649 }
1650
1651
1652 static int compare_fields_by_offset(int* a, int* b) {
1653 return a[0] - b[0];
1654 }
1655
1656 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) {
1657 InstanceKlass* super = superklass();
1658 if (super != NULL) {
1659 super->do_nonstatic_fields(cl);
1660 }
1661 fieldDescriptor fd;
1662 int length = java_fields_count();
1663 // In DebugInfo nonstatic fields are sorted by offset.
1664 int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1), mtClass);
1665 int j = 0;
1666 for (int i = 0; i < length; i += 1) {
1667 fd.reinitialize(this, i);
1668 if (!fd.is_static()) {
1669 fields_sorted[j + 0] = fd.offset();
1670 fields_sorted[j + 1] = i;
1671 j += 2;
1672 }
1673 }
1674 if (j > 0) {
1675 length = j;
1676 // _sort_Fn is defined in growableArray.hpp.
1677 qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset);
1678 for (int i = 0; i < length; i += 2) {
1679 fd.reinitialize(this, fields_sorted[i + 1]);
1680 assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields");
1681 cl->do_field(&fd);
1682 }
1683 }
1684 FREE_C_HEAP_ARRAY(int, fields_sorted);
1685 }
1686
1687
1688 void InstanceKlass::array_klasses_do(void f(Klass* k)) {
1689 if (array_klasses() != NULL)
1690 ArrayKlass::cast(array_klasses())->array_klasses_do(f);
1691 }
1692
1693 #ifdef ASSERT
1694 static int linear_search(const Array<Method*>* methods,
1695 const Symbol* name,
1696 const Symbol* signature) {
1697 const int len = methods->length();
1698 for (int index = 0; index < len; index++) {
1699 const Method* const m = methods->at(index);
1700 assert(m->is_method(), "must be method");
1701 if (m->signature() == signature && m->name() == name) {
1702 return index;
1703 }
1704 }
1705 return -1;
1706 }
1707 #endif
1708
1709 static int binary_search(const Array<Method*>* methods, const Symbol* name) {
1710 int len = methods->length();
1711 // methods are sorted, so do binary search
1712 int l = 0;
1713 int h = len - 1;
1714 while (l <= h) {
1715 int mid = (l + h) >> 1;
1716 Method* m = methods->at(mid);
1717 assert(m->is_method(), "must be method");
1718 int res = m->name()->fast_compare(name);
1719 if (res == 0) {
1720 return mid;
1721 } else if (res < 0) {
1722 l = mid + 1;
1723 } else {
1724 h = mid - 1;
1725 }
1726 }
1727 return -1;
1728 }
1729
1730 // find_method looks up the name/signature in the local methods array
1731 Method* InstanceKlass::find_method(const Symbol* name,
1732 const Symbol* signature) const {
1733 return find_method_impl(name, signature, find_overpass, find_static, find_private);
1734 }
1735
1736 Method* InstanceKlass::find_method_impl(const Symbol* name,
1737 const Symbol* signature,
1738 OverpassLookupMode overpass_mode,
1739 StaticLookupMode static_mode,
1740 PrivateLookupMode private_mode) const {
1741 return InstanceKlass::find_method_impl(methods(),
1742 name,
1743 signature,
1744 overpass_mode,
1745 static_mode,
1746 private_mode);
1747 }
1748
1749 // find_instance_method looks up the name/signature in the local methods array
1750 // and skips over static methods
1751 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods,
1752 const Symbol* name,
1753 const Symbol* signature,
1754 PrivateLookupMode private_mode) {
1755 Method* const meth = InstanceKlass::find_method_impl(methods,
1756 name,
1757 signature,
1758 find_overpass,
1759 skip_static,
1760 private_mode);
1761 assert(((meth == NULL) || !meth->is_static()),
1762 "find_instance_method should have skipped statics");
1763 return meth;
1764 }
1765
1766 // find_instance_method looks up the name/signature in the local methods array
1767 // and skips over static methods
1768 Method* InstanceKlass::find_instance_method(const Symbol* name,
1769 const Symbol* signature,
1770 PrivateLookupMode private_mode) const {
1771 return InstanceKlass::find_instance_method(methods(), name, signature, private_mode);
1772 }
1773
1774 // Find looks up the name/signature in the local methods array
1775 // and filters on the overpass, static and private flags
1776 // This returns the first one found
1777 // note that the local methods array can have up to one overpass, one static
1778 // and one instance (private or not) with the same name/signature
1779 Method* InstanceKlass::find_local_method(const Symbol* name,
1780 const Symbol* signature,
1781 OverpassLookupMode overpass_mode,
1782 StaticLookupMode static_mode,
1783 PrivateLookupMode private_mode) const {
1784 return InstanceKlass::find_method_impl(methods(),
1785 name,
1786 signature,
1787 overpass_mode,
1788 static_mode,
1789 private_mode);
1790 }
1791
1792 // Find looks up the name/signature in the local methods array
1793 // and filters on the overpass, static and private flags
1794 // This returns the first one found
1795 // note that the local methods array can have up to one overpass, one static
1796 // and one instance (private or not) with the same name/signature
1797 Method* InstanceKlass::find_local_method(const Array<Method*>* methods,
1798 const Symbol* name,
1799 const Symbol* signature,
1800 OverpassLookupMode overpass_mode,
1801 StaticLookupMode static_mode,
1802 PrivateLookupMode private_mode) {
1803 return InstanceKlass::find_method_impl(methods,
1804 name,
1805 signature,
1806 overpass_mode,
1807 static_mode,
1808 private_mode);
1809 }
1810
1811 Method* InstanceKlass::find_method(const Array<Method*>* methods,
1812 const Symbol* name,
1813 const Symbol* signature) {
1814 return InstanceKlass::find_method_impl(methods,
1815 name,
1816 signature,
1817 find_overpass,
1818 find_static,
1819 find_private);
1820 }
1821
1822 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods,
1823 const Symbol* name,
1824 const Symbol* signature,
1825 OverpassLookupMode overpass_mode,
1826 StaticLookupMode static_mode,
1827 PrivateLookupMode private_mode) {
1828 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode);
1829 return hit >= 0 ? methods->at(hit): NULL;
1830 }
1831
1832 // true if method matches signature and conforms to skipping_X conditions.
1833 static bool method_matches(const Method* m,
1834 const Symbol* signature,
1835 bool skipping_overpass,
1836 bool skipping_static,
1837 bool skipping_private) {
1838 return ((m->signature() == signature) &&
1839 (!skipping_overpass || !m->is_overpass()) &&
1840 (!skipping_static || !m->is_static()) &&
1841 (!skipping_private || !m->is_private()));
1842 }
1843
1844 // Used directly for default_methods to find the index into the
1845 // default_vtable_indices, and indirectly by find_method
1846 // find_method_index looks in the local methods array to return the index
1847 // of the matching name/signature. If, overpass methods are being ignored,
1848 // the search continues to find a potential non-overpass match. This capability
1849 // is important during method resolution to prefer a static method, for example,
1850 // over an overpass method.
1851 // There is the possibility in any _method's array to have the same name/signature
1852 // for a static method, an overpass method and a local instance method
1853 // To correctly catch a given method, the search criteria may need
1854 // to explicitly skip the other two. For local instance methods, it
1855 // is often necessary to skip private methods
1856 int InstanceKlass::find_method_index(const Array<Method*>* methods,
1857 const Symbol* name,
1858 const Symbol* signature,
1859 OverpassLookupMode overpass_mode,
1860 StaticLookupMode static_mode,
1861 PrivateLookupMode private_mode) {
1862 const bool skipping_overpass = (overpass_mode == skip_overpass);
1863 const bool skipping_static = (static_mode == skip_static);
1864 const bool skipping_private = (private_mode == skip_private);
1865 const int hit = binary_search(methods, name);
1866 if (hit != -1) {
1867 const Method* const m = methods->at(hit);
1868
1869 // Do linear search to find matching signature. First, quick check
1870 // for common case, ignoring overpasses if requested.
1871 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1872 return hit;
1873 }
1874
1875 // search downwards through overloaded methods
1876 int i;
1877 for (i = hit - 1; i >= 0; --i) {
1878 const Method* const m = methods->at(i);
1879 assert(m->is_method(), "must be method");
1880 if (m->name() != name) {
1881 break;
1882 }
1883 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1884 return i;
1885 }
1886 }
1887 // search upwards
1888 for (i = hit + 1; i < methods->length(); ++i) {
1889 const Method* const m = methods->at(i);
1890 assert(m->is_method(), "must be method");
1891 if (m->name() != name) {
1892 break;
1893 }
1894 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1895 return i;
1896 }
1897 }
1898 // not found
1899 #ifdef ASSERT
1900 const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 :
1901 linear_search(methods, name, signature);
1902 assert(-1 == index, "binary search should have found entry %d", index);
1903 #endif
1904 }
1905 return -1;
1906 }
1907
1908 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const {
1909 return find_method_by_name(methods(), name, end);
1910 }
1911
1912 int InstanceKlass::find_method_by_name(const Array<Method*>* methods,
1913 const Symbol* name,
1914 int* end_ptr) {
1915 assert(end_ptr != NULL, "just checking");
1916 int start = binary_search(methods, name);
1917 int end = start + 1;
1918 if (start != -1) {
1919 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
1920 while (end < methods->length() && (methods->at(end))->name() == name) ++end;
1921 *end_ptr = end;
1922 return start;
1923 }
1924 return -1;
1925 }
1926
1927 // uncached_lookup_method searches both the local class methods array and all
1928 // superclasses methods arrays, skipping any overpass methods in superclasses,
1929 // and possibly skipping private methods.
1930 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
1931 const Symbol* signature,
1932 OverpassLookupMode overpass_mode,
1933 PrivateLookupMode private_mode) const {
1934 OverpassLookupMode overpass_local_mode = overpass_mode;
1935 const Klass* klass = this;
1936 while (klass != NULL) {
1937 Method* const method = InstanceKlass::cast(klass)->find_method_impl(name,
1938 signature,
1939 overpass_local_mode,
1940 find_static,
1941 private_mode);
1942 if (method != NULL) {
1943 return method;
1944 }
1945 if (name == vmSymbols::object_initializer_name()) {
1946 break; // <init> is never inherited, not even as a static factory
1947 }
1948 klass = klass->super();
1949 overpass_local_mode = skip_overpass; // Always ignore overpass methods in superclasses
1950 }
1951 return NULL;
1952 }
1953
1954 #ifdef ASSERT
1955 // search through class hierarchy and return true if this class or
1956 // one of the superclasses was redefined
1957 bool InstanceKlass::has_redefined_this_or_super() const {
1958 const Klass* klass = this;
1959 while (klass != NULL) {
1960 if (InstanceKlass::cast(klass)->has_been_redefined()) {
1961 return true;
1962 }
1963 klass = klass->super();
1964 }
1965 return false;
1966 }
1967 #endif
1968
1969 // lookup a method in the default methods list then in all transitive interfaces
1970 // Do NOT return private or static methods
1971 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
1972 Symbol* signature) const {
1973 Method* m = NULL;
1974 if (default_methods() != NULL) {
1975 m = find_method(default_methods(), name, signature);
1976 }
1977 // Look up interfaces
1978 if (m == NULL) {
1979 m = lookup_method_in_all_interfaces(name, signature, find_defaults);
1980 }
1981 return m;
1982 }
1983
1984 // lookup a method in all the interfaces that this class implements
1985 // Do NOT return private or static methods, new in JDK8 which are not externally visible
1986 // They should only be found in the initial InterfaceMethodRef
1987 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
1988 Symbol* signature,
1989 DefaultsLookupMode defaults_mode) const {
1990 Array<InstanceKlass*>* all_ifs = transitive_interfaces();
1991 int num_ifs = all_ifs->length();
1992 InstanceKlass *ik = NULL;
1993 for (int i = 0; i < num_ifs; i++) {
1994 ik = all_ifs->at(i);
1995 Method* m = ik->lookup_method(name, signature);
1996 if (m != NULL && m->is_public() && !m->is_static() &&
1997 ((defaults_mode != skip_defaults) || !m->is_default_method())) {
1998 return m;
1999 }
2000 }
2001 return NULL;
2002 }
2003
2004 /* jni_id_for_impl for jfieldIds only */
2005 JNIid* InstanceKlass::jni_id_for_impl(int offset) {
2006 MutexLocker ml(JfieldIdCreation_lock);
2007 // Retry lookup after we got the lock
2008 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
2009 if (probe == NULL) {
2010 // Slow case, allocate new static field identifier
2011 probe = new JNIid(this, offset, jni_ids());
2012 set_jni_ids(probe);
2013 }
2014 return probe;
2015 }
2016
2017
2018 /* jni_id_for for jfieldIds only */
2019 JNIid* InstanceKlass::jni_id_for(int offset) {
2020 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
2021 if (probe == NULL) {
2022 probe = jni_id_for_impl(offset);
2023 }
2024 return probe;
2025 }
2026
2027 u2 InstanceKlass::enclosing_method_data(int offset) const {
2028 const Array<jushort>* const inner_class_list = inner_classes();
2029 if (inner_class_list == NULL) {
2030 return 0;
2031 }
2032 const int length = inner_class_list->length();
2033 if (length % inner_class_next_offset == 0) {
2034 return 0;
2035 }
2036 const int index = length - enclosing_method_attribute_size;
2037 assert(offset < enclosing_method_attribute_size, "invalid offset");
2038 return inner_class_list->at(index + offset);
2039 }
2040
2041 void InstanceKlass::set_enclosing_method_indices(u2 class_index,
2042 u2 method_index) {
2043 Array<jushort>* inner_class_list = inner_classes();
2044 assert (inner_class_list != NULL, "_inner_classes list is not set up");
2045 int length = inner_class_list->length();
2046 if (length % inner_class_next_offset == enclosing_method_attribute_size) {
2047 int index = length - enclosing_method_attribute_size;
2048 inner_class_list->at_put(
2049 index + enclosing_method_class_index_offset, class_index);
2050 inner_class_list->at_put(
2051 index + enclosing_method_method_index_offset, method_index);
2052 }
2053 }
2054
2055 // Lookup or create a jmethodID.
2056 // This code is called by the VMThread and JavaThreads so the
2057 // locking has to be done very carefully to avoid deadlocks
2058 // and/or other cache consistency problems.
2059 //
2060 jmethodID InstanceKlass::get_jmethod_id(const methodHandle& method_h) {
2061 size_t idnum = (size_t)method_h->method_idnum();
2062 jmethodID* jmeths = methods_jmethod_ids_acquire();
2063 size_t length = 0;
2064 jmethodID id = NULL;
2065
2066 // We use a double-check locking idiom here because this cache is
2067 // performance sensitive. In the normal system, this cache only
2068 // transitions from NULL to non-NULL which is safe because we use
2069 // release_set_methods_jmethod_ids() to advertise the new cache.
2070 // A partially constructed cache should never be seen by a racing
2071 // thread. We also use release_store() to save a new jmethodID
2072 // in the cache so a partially constructed jmethodID should never be
2073 // seen either. Cache reads of existing jmethodIDs proceed without a
2074 // lock, but cache writes of a new jmethodID requires uniqueness and
2075 // creation of the cache itself requires no leaks so a lock is
2076 // generally acquired in those two cases.
2077 //
2078 // If the RedefineClasses() API has been used, then this cache can
2079 // grow and we'll have transitions from non-NULL to bigger non-NULL.
2080 // Cache creation requires no leaks and we require safety between all
2081 // cache accesses and freeing of the old cache so a lock is generally
2082 // acquired when the RedefineClasses() API has been used.
2083
2084 if (jmeths != NULL) {
2085 // the cache already exists
2086 if (!idnum_can_increment()) {
2087 // the cache can't grow so we can just get the current values
2088 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2089 } else {
2090 // cache can grow so we have to be more careful
2091 if (Threads::number_of_threads() == 0 ||
2092 SafepointSynchronize::is_at_safepoint()) {
2093 // we're single threaded or at a safepoint - no locking needed
2094 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2095 } else {
2096 MutexLocker ml(JmethodIdCreation_lock);
2097 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2098 }
2099 }
2100 }
2101 // implied else:
2102 // we need to allocate a cache so default length and id values are good
2103
2104 if (jmeths == NULL || // no cache yet
2105 length <= idnum || // cache is too short
2106 id == NULL) { // cache doesn't contain entry
2107
2108 // This function can be called by the VMThread so we have to do all
2109 // things that might block on a safepoint before grabbing the lock.
2110 // Otherwise, we can deadlock with the VMThread or have a cache
2111 // consistency issue. These vars keep track of what we might have
2112 // to free after the lock is dropped.
2113 jmethodID to_dealloc_id = NULL;
2114 jmethodID* to_dealloc_jmeths = NULL;
2115
2116 // may not allocate new_jmeths or use it if we allocate it
2117 jmethodID* new_jmeths = NULL;
2118 if (length <= idnum) {
2119 // allocate a new cache that might be used
2120 size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count());
2121 new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1, mtClass);
2122 memset(new_jmeths, 0, (size+1)*sizeof(jmethodID));
2123 // cache size is stored in element[0], other elements offset by one
2124 new_jmeths[0] = (jmethodID)size;
2125 }
2126
2127 // allocate a new jmethodID that might be used
2128 jmethodID new_id = NULL;
2129 if (method_h->is_old() && !method_h->is_obsolete()) {
2130 // The method passed in is old (but not obsolete), we need to use the current version
2131 Method* current_method = method_with_idnum((int)idnum);
2132 assert(current_method != NULL, "old and but not obsolete, so should exist");
2133 new_id = Method::make_jmethod_id(class_loader_data(), current_method);
2134 } else {
2135 // It is the current version of the method or an obsolete method,
2136 // use the version passed in
2137 new_id = Method::make_jmethod_id(class_loader_data(), method_h());
2138 }
2139
2140 if (Threads::number_of_threads() == 0 ||
2141 SafepointSynchronize::is_at_safepoint()) {
2142 // we're single threaded or at a safepoint - no locking needed
2143 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2144 &to_dealloc_id, &to_dealloc_jmeths);
2145 } else {
2146 MutexLocker ml(JmethodIdCreation_lock);
2147 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2148 &to_dealloc_id, &to_dealloc_jmeths);
2149 }
2150
2151 // The lock has been dropped so we can free resources.
2152 // Free up either the old cache or the new cache if we allocated one.
2153 if (to_dealloc_jmeths != NULL) {
2154 FreeHeap(to_dealloc_jmeths);
2155 }
2156 // free up the new ID since it wasn't needed
2157 if (to_dealloc_id != NULL) {
2158 Method::destroy_jmethod_id(class_loader_data(), to_dealloc_id);
2159 }
2160 }
2161 return id;
2162 }
2163
2164 // Figure out how many jmethodIDs haven't been allocated, and make
2165 // sure space for them is pre-allocated. This makes getting all
2166 // method ids much, much faster with classes with more than 8
2167 // methods, and has a *substantial* effect on performance with jvmti
2168 // code that loads all jmethodIDs for all classes.
2169 void InstanceKlass::ensure_space_for_methodids(int start_offset) {
2170 int new_jmeths = 0;
2171 int length = methods()->length();
2172 for (int index = start_offset; index < length; index++) {
2173 Method* m = methods()->at(index);
2174 jmethodID id = m->find_jmethod_id_or_null();
2175 if (id == NULL) {
2176 new_jmeths++;
2177 }
2178 }
2179 if (new_jmeths != 0) {
2180 Method::ensure_jmethod_ids(class_loader_data(), new_jmeths);
2181 }
2182 }
2183
2184 // Common code to fetch the jmethodID from the cache or update the
2185 // cache with the new jmethodID. This function should never do anything
2186 // that causes the caller to go to a safepoint or we can deadlock with
2187 // the VMThread or have cache consistency issues.
2188 //
2189 jmethodID InstanceKlass::get_jmethod_id_fetch_or_update(
2190 size_t idnum, jmethodID new_id,
2191 jmethodID* new_jmeths, jmethodID* to_dealloc_id_p,
2192 jmethodID** to_dealloc_jmeths_p) {
2193 assert(new_id != NULL, "sanity check");
2194 assert(to_dealloc_id_p != NULL, "sanity check");
2195 assert(to_dealloc_jmeths_p != NULL, "sanity check");
2196 assert(Threads::number_of_threads() == 0 ||
2197 SafepointSynchronize::is_at_safepoint() ||
2198 JmethodIdCreation_lock->owned_by_self(), "sanity check");
2199
2200 // reacquire the cache - we are locked, single threaded or at a safepoint
2201 jmethodID* jmeths = methods_jmethod_ids_acquire();
2202 jmethodID id = NULL;
2203 size_t length = 0;
2204
2205 if (jmeths == NULL || // no cache yet
2206 (length = (size_t)jmeths[0]) <= idnum) { // cache is too short
2207 if (jmeths != NULL) {
2208 // copy any existing entries from the old cache
2209 for (size_t index = 0; index < length; index++) {
2210 new_jmeths[index+1] = jmeths[index+1];
2211 }
2212 *to_dealloc_jmeths_p = jmeths; // save old cache for later delete
2213 }
2214 release_set_methods_jmethod_ids(jmeths = new_jmeths);
2215 } else {
2216 // fetch jmethodID (if any) from the existing cache
2217 id = jmeths[idnum+1];
2218 *to_dealloc_jmeths_p = new_jmeths; // save new cache for later delete
2219 }
2220 if (id == NULL) {
2221 // No matching jmethodID in the existing cache or we have a new
2222 // cache or we just grew the cache. This cache write is done here
2223 // by the first thread to win the foot race because a jmethodID
2224 // needs to be unique once it is generally available.
2225 id = new_id;
2226
2227 // The jmethodID cache can be read while unlocked so we have to
2228 // make sure the new jmethodID is complete before installing it
2229 // in the cache.
2230 OrderAccess::release_store(&jmeths[idnum+1], id);
2231 } else {
2232 *to_dealloc_id_p = new_id; // save new id for later delete
2233 }
2234 return id;
2235 }
2236
2237
2238 // Common code to get the jmethodID cache length and the jmethodID
2239 // value at index idnum if there is one.
2240 //
2241 void InstanceKlass::get_jmethod_id_length_value(jmethodID* cache,
2242 size_t idnum, size_t *length_p, jmethodID* id_p) {
2243 assert(cache != NULL, "sanity check");
2244 assert(length_p != NULL, "sanity check");
2245 assert(id_p != NULL, "sanity check");
2246
2247 // cache size is stored in element[0], other elements offset by one
2248 *length_p = (size_t)cache[0];
2249 if (*length_p <= idnum) { // cache is too short
2250 *id_p = NULL;
2251 } else {
2252 *id_p = cache[idnum+1]; // fetch jmethodID (if any)
2253 }
2254 }
2255
2256
2257 // Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles
2258 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
2259 size_t idnum = (size_t)method->method_idnum();
2260 jmethodID* jmeths = methods_jmethod_ids_acquire();
2261 size_t length; // length assigned as debugging crumb
2262 jmethodID id = NULL;
2263 if (jmeths != NULL && // If there is a cache
2264 (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough,
2265 id = jmeths[idnum+1]; // Look up the id (may be NULL)
2266 }
2267 return id;
2268 }
2269
2270 inline DependencyContext InstanceKlass::dependencies() {
2271 DependencyContext dep_context(&_dep_context, &_dep_context_last_cleaned);
2272 return dep_context;
2273 }
2274
2275 int InstanceKlass::mark_dependent_nmethods(KlassDepChange& changes) {
2276 return dependencies().mark_dependent_nmethods(changes);
2277 }
2278
2279 void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
2280 dependencies().add_dependent_nmethod(nm);
2281 }
2282
2283 void InstanceKlass::remove_dependent_nmethod(nmethod* nm) {
2284 dependencies().remove_dependent_nmethod(nm);
2285 }
2286
2287 void InstanceKlass::clean_dependency_context() {
2288 dependencies().clean_unloading_dependents();
2289 }
2290
2291 #ifndef PRODUCT
2292 void InstanceKlass::print_dependent_nmethods(bool verbose) {
2293 dependencies().print_dependent_nmethods(verbose);
2294 }
2295
2296 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
2297 return dependencies().is_dependent_nmethod(nm);
2298 }
2299 #endif //PRODUCT
2300
2301 void InstanceKlass::clean_weak_instanceklass_links() {
2302 clean_implementors_list();
2303 clean_method_data();
2304 }
2305
2306 void InstanceKlass::clean_implementors_list() {
2307 assert(is_loader_alive(), "this klass should be live");
2308 if (is_interface()) {
2309 assert (ClassUnloading, "only called for ClassUnloading");
2310 for (;;) {
2311 // Use load_acquire due to competing with inserts
2312 Klass* impl = OrderAccess::load_acquire(adr_implementor());
2313 if (impl != NULL && !impl->is_loader_alive()) {
2314 // NULL this field, might be an unloaded klass or NULL
2315 Klass* volatile* klass = adr_implementor();
2316 if (Atomic::cmpxchg((Klass*)NULL, klass, impl) == impl) {
2317 // Successfully unlinking implementor.
2318 if (log_is_enabled(Trace, class, unload)) {
2319 ResourceMark rm;
2320 log_trace(class, unload)("unlinking class (implementor): %s", impl->external_name());
2321 }
2322 return;
2323 }
2324 } else {
2325 return;
2326 }
2327 }
2328 }
2329 }
2330
2331 void InstanceKlass::clean_method_data() {
2332 for (int m = 0; m < methods()->length(); m++) {
2333 MethodData* mdo = methods()->at(m)->method_data();
2334 if (mdo != NULL) {
2335 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : mdo->extra_data_lock());
2336 mdo->clean_method_data(/*always_clean*/false);
2337 }
2338 }
2339 }
2340
2341 bool InstanceKlass::supers_have_passed_fingerprint_checks() {
2342 if (java_super() != NULL && !java_super()->has_passed_fingerprint_check()) {
2343 ResourceMark rm;
2344 log_trace(class, fingerprint)("%s : super %s not fingerprinted", external_name(), java_super()->external_name());
2345 return false;
2346 }
2347
2348 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
2349 if (local_interfaces != NULL) {
2350 int length = local_interfaces->length();
2351 for (int i = 0; i < length; i++) {
2352 InstanceKlass* intf = local_interfaces->at(i);
2353 if (!intf->has_passed_fingerprint_check()) {
2354 ResourceMark rm;
2355 log_trace(class, fingerprint)("%s : interface %s not fingerprinted", external_name(), intf->external_name());
2356 return false;
2357 }
2358 }
2359 }
2360
2361 return true;
2362 }
2363
2364 bool InstanceKlass::should_store_fingerprint(bool is_unsafe_anonymous) {
2365 #if INCLUDE_AOT
2366 // We store the fingerprint into the InstanceKlass only in the following 2 cases:
2367 if (CalculateClassFingerprint) {
2368 // (1) We are running AOT to generate a shared library.
2369 return true;
2370 }
2371 if (Arguments::is_dumping_archive()) {
2372 // (2) We are running -Xshare:dump or -XX:ArchiveClassesAtExit to create a shared archive
2373 return true;
2374 }
2375 if (UseAOT && is_unsafe_anonymous) {
2376 // (3) We are using AOT code from a shared library and see an unsafe anonymous class
2377 return true;
2378 }
2379 #endif
2380
2381 // In all other cases we might set the _misc_has_passed_fingerprint_check bit,
2382 // but do not store the 64-bit fingerprint to save space.
2383 return false;
2384 }
2385
2386 bool InstanceKlass::has_stored_fingerprint() const {
2387 #if INCLUDE_AOT
2388 return should_store_fingerprint() || is_shared();
2389 #else
2390 return false;
2391 #endif
2392 }
2393
2394 uint64_t InstanceKlass::get_stored_fingerprint() const {
2395 address adr = adr_fingerprint();
2396 if (adr != NULL) {
2397 return (uint64_t)Bytes::get_native_u8(adr); // adr may not be 64-bit aligned
2398 }
2399 return 0;
2400 }
2401
2402 void InstanceKlass::store_fingerprint(uint64_t fingerprint) {
2403 address adr = adr_fingerprint();
2404 if (adr != NULL) {
2405 Bytes::put_native_u8(adr, (u8)fingerprint); // adr may not be 64-bit aligned
2406
2407 ResourceMark rm;
2408 log_trace(class, fingerprint)("stored as " PTR64_FORMAT " for class %s", fingerprint, external_name());
2409 }
2410 }
2411
2412 void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) {
2413 Klass::metaspace_pointers_do(it);
2414
2415 if (log_is_enabled(Trace, cds)) {
2416 ResourceMark rm;
2417 log_trace(cds)("Iter(InstanceKlass): %p (%s)", this, external_name());
2418 }
2419
2420 it->push(&_annotations);
2421 it->push((Klass**)&_array_klasses);
2422 it->push(&_constants);
2423 it->push(&_inner_classes);
2424 it->push(&_array_name);
2425 #if INCLUDE_JVMTI
2426 it->push(&_previous_versions);
2427 #endif
2428 it->push(&_methods);
2429 it->push(&_default_methods);
2430 it->push(&_local_interfaces);
2431 it->push(&_transitive_interfaces);
2432 it->push(&_method_ordering);
2433 it->push(&_default_vtable_indices);
2434 it->push(&_fields);
2435
2436 if (itable_length() > 0) {
2437 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2438 int method_table_offset_in_words = ioe->offset()/wordSize;
2439 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
2440 / itableOffsetEntry::size();
2441
2442 for (int i = 0; i < nof_interfaces; i ++, ioe ++) {
2443 if (ioe->interface_klass() != NULL) {
2444 it->push(ioe->interface_klass_addr());
2445 itableMethodEntry* ime = ioe->first_method_entry(this);
2446 int n = klassItable::method_count_for_interface(ioe->interface_klass());
2447 for (int index = 0; index < n; index ++) {
2448 it->push(ime[index].method_addr());
2449 }
2450 }
2451 }
2452 }
2453
2454 it->push(&_nest_members);
2455 }
2456
2457 void InstanceKlass::remove_unshareable_info() {
2458 Klass::remove_unshareable_info();
2459
2460 if (is_in_error_state()) {
2461 // Classes are attempted to link during dumping and may fail,
2462 // but these classes are still in the dictionary and class list in CLD.
2463 // Check in_error state first because in_error is > linked state, so
2464 // is_linked() is true.
2465 // If there's a linking error, there is nothing else to remove.
2466 return;
2467 }
2468
2469 // Reset to the 'allocated' state to prevent any premature accessing to
2470 // a shared class at runtime while the class is still being loaded and
2471 // restored. A class' init_state is set to 'loaded' at runtime when it's
2472 // being added to class hierarchy (see SystemDictionary:::add_to_hierarchy()).
2473 _init_state = allocated;
2474
2475 { // Otherwise this needs to take out the Compile_lock.
2476 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
2477 init_implementor();
2478 }
2479
2480 constants()->remove_unshareable_info();
2481
2482 for (int i = 0; i < methods()->length(); i++) {
2483 Method* m = methods()->at(i);
2484 m->remove_unshareable_info();
2485 }
2486
2487 // do array classes also.
2488 if (array_klasses() != NULL) {
2489 array_klasses()->remove_unshareable_info();
2490 }
2491
2492 // These are not allocated from metaspace. They are safe to set to NULL.
2493 _source_debug_extension = NULL;
2494 _dep_context = NULL;
2495 _osr_nmethods_head = NULL;
2496 #if INCLUDE_JVMTI
2497 _breakpoints = NULL;
2498 _previous_versions = NULL;
2499 _cached_class_file = NULL;
2500 #endif
2501
2502 _init_thread = NULL;
2503 _methods_jmethod_ids = NULL;
2504 _jni_ids = NULL;
2505 _oop_map_cache = NULL;
2506 // clear _nest_host to ensure re-load at runtime
2507 _nest_host = NULL;
2508 }
2509
2510 void InstanceKlass::remove_java_mirror() {
2511 Klass::remove_java_mirror();
2512
2513 // do array classes also.
2514 if (array_klasses() != NULL) {
2515 array_klasses()->remove_java_mirror();
2516 }
2517 }
2518
2519 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) {
2520 // SystemDictionary::add_to_hierarchy() sets the init_state to loaded
2521 // before the InstanceKlass is added to the SystemDictionary. Make
2522 // sure the current state is <loaded.
2523 assert(!is_loaded(), "invalid init state");
2524 set_package(loader_data, CHECK);
2525 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
2526
2527 Array<Method*>* methods = this->methods();
2528 int num_methods = methods->length();
2529 for (int index = 0; index < num_methods; ++index) {
2530 methods->at(index)->restore_unshareable_info(CHECK);
2531 }
2532 if (JvmtiExport::has_redefined_a_class()) {
2533 // Reinitialize vtable because RedefineClasses may have changed some
2534 // entries in this vtable for super classes so the CDS vtable might
2535 // point to old or obsolete entries. RedefineClasses doesn't fix up
2536 // vtables in the shared system dictionary, only the main one.
2537 // It also redefines the itable too so fix that too.
2538 vtable().initialize_vtable(false, CHECK);
2539 itable().initialize_itable(false, CHECK);
2540 }
2541
2542 // restore constant pool resolved references
2543 constants()->restore_unshareable_info(CHECK);
2544
2545 if (array_klasses() != NULL) {
2546 // Array classes have null protection domain.
2547 // --> see ArrayKlass::complete_create_array_klass()
2548 array_klasses()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
2549 }
2550
2551 // Initialize current biased locking state.
2552 if (UseBiasedLocking && BiasedLocking::enabled()) {
2553 set_prototype_header(markWord::biased_locking_prototype());
2554 }
2555 }
2556
2557 // returns true IFF is_in_error_state() has been changed as a result of this call.
2558 bool InstanceKlass::check_sharing_error_state() {
2559 assert(DumpSharedSpaces, "should only be called during dumping");
2560 bool old_state = is_in_error_state();
2561
2562 if (!is_in_error_state()) {
2563 bool bad = false;
2564 for (InstanceKlass* sup = java_super(); sup; sup = sup->java_super()) {
2565 if (sup->is_in_error_state()) {
2566 bad = true;
2567 break;
2568 }
2569 }
2570 if (!bad) {
2571 Array<InstanceKlass*>* interfaces = transitive_interfaces();
2572 for (int i = 0; i < interfaces->length(); i++) {
2573 InstanceKlass* iface = interfaces->at(i);
2574 if (iface->is_in_error_state()) {
2575 bad = true;
2576 break;
2577 }
2578 }
2579 }
2580
2581 if (bad) {
2582 set_in_error_state();
2583 }
2584 }
2585
2586 return (old_state != is_in_error_state());
2587 }
2588
2589 void InstanceKlass::set_class_loader_type(s2 loader_type) {
2590 switch (loader_type) {
2591 case ClassLoader::BOOT_LOADER:
2592 _misc_flags |= _misc_is_shared_boot_class;
2593 break;
2594 case ClassLoader::PLATFORM_LOADER:
2595 _misc_flags |= _misc_is_shared_platform_class;
2596 break;
2597 case ClassLoader::APP_LOADER:
2598 _misc_flags |= _misc_is_shared_app_class;
2599 break;
2600 default:
2601 ShouldNotReachHere();
2602 break;
2603 }
2604 }
2605
2606 #if INCLUDE_JVMTI
2607 static void clear_all_breakpoints(Method* m) {
2608 m->clear_all_breakpoints();
2609 }
2610 #endif
2611
2612 void InstanceKlass::unload_class(InstanceKlass* ik) {
2613 // Release dependencies.
2614 ik->dependencies().remove_all_dependents();
2615
2616 // notify the debugger
2617 if (JvmtiExport::should_post_class_unload()) {
2618 JvmtiExport::post_class_unload(ik);
2619 }
2620
2621 // notify ClassLoadingService of class unload
2622 ClassLoadingService::notify_class_unloaded(ik);
2623
2624 if (Arguments::is_dumping_archive()) {
2625 SystemDictionaryShared::remove_dumptime_info(ik);
2626 }
2627
2628 if (log_is_enabled(Info, class, unload)) {
2629 ResourceMark rm;
2630 log_info(class, unload)("unloading class %s " INTPTR_FORMAT, ik->external_name(), p2i(ik));
2631 }
2632
2633 Events::log_class_unloading(Thread::current(), ik);
2634
2635 #if INCLUDE_JFR
2636 assert(ik != NULL, "invariant");
2637 EventClassUnload event;
2638 event.set_unloadedClass(ik);
2639 event.set_definingClassLoader(ik->class_loader_data());
2640 event.commit();
2641 #endif
2642 }
2643
2644 static void method_release_C_heap_structures(Method* m) {
2645 m->release_C_heap_structures();
2646 }
2647
2648 void InstanceKlass::release_C_heap_structures(InstanceKlass* ik) {
2649 // Clean up C heap
2650 ik->release_C_heap_structures();
2651 ik->constants()->release_C_heap_structures();
2652
2653 // Deallocate and call destructors for MDO mutexes
2654 ik->methods_do(method_release_C_heap_structures);
2655
2656 }
2657
2658 void InstanceKlass::release_C_heap_structures() {
2659 // Can't release the constant pool here because the constant pool can be
2660 // deallocated separately from the InstanceKlass for default methods and
2661 // redefine classes.
2662
2663 // Deallocate oop map cache
2664 if (_oop_map_cache != NULL) {
2665 delete _oop_map_cache;
2666 _oop_map_cache = NULL;
2667 }
2668
2669 // Deallocate JNI identifiers for jfieldIDs
2670 JNIid::deallocate(jni_ids());
2671 set_jni_ids(NULL);
2672
2673 jmethodID* jmeths = methods_jmethod_ids_acquire();
2674 if (jmeths != (jmethodID*)NULL) {
2675 release_set_methods_jmethod_ids(NULL);
2676 FreeHeap(jmeths);
2677 }
2678
2679 assert(_dep_context == NULL,
2680 "dependencies should already be cleaned");
2681
2682 #if INCLUDE_JVMTI
2683 // Deallocate breakpoint records
2684 if (breakpoints() != 0x0) {
2685 methods_do(clear_all_breakpoints);
2686 assert(breakpoints() == 0x0, "should have cleared breakpoints");
2687 }
2688
2689 // deallocate the cached class file
2690 if (_cached_class_file != NULL) {
2691 os::free(_cached_class_file);
2692 _cached_class_file = NULL;
2693 }
2694 #endif
2695
2696 // Decrement symbol reference counts associated with the unloaded class.
2697 if (_name != NULL) _name->decrement_refcount();
2698 // unreference array name derived from this class name (arrays of an unloaded
2699 // class can't be referenced anymore).
2700 if (_array_name != NULL) _array_name->decrement_refcount();
2701 if (_value_types != NULL) {
2702 for (int i = 0; i < _value_types->length(); i++) {
2703 Symbol* s = _value_types->at(i)._class_name;
2704 if (s != NULL) {
2705 s->decrement_refcount();
2706 }
2707 }
2708 }
2709 FREE_C_HEAP_ARRAY(char, _source_debug_extension);
2710 }
2711
2712 void InstanceKlass::set_source_debug_extension(const char* array, int length) {
2713 if (array == NULL) {
2714 _source_debug_extension = NULL;
2715 } else {
2716 // Adding one to the attribute length in order to store a null terminator
2717 // character could cause an overflow because the attribute length is
2718 // already coded with an u4 in the classfile, but in practice, it's
2719 // unlikely to happen.
2720 assert((length+1) > length, "Overflow checking");
2721 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
2722 for (int i = 0; i < length; i++) {
2723 sde[i] = array[i];
2724 }
2725 sde[length] = '\0';
2726 _source_debug_extension = sde;
2727 }
2728 }
2729
2730 const char* InstanceKlass::signature_name() const {
2731 return signature_name_of(is_value() ? JVM_SIGNATURE_VALUETYPE : JVM_SIGNATURE_CLASS);
2732 }
2733
2734 const char* InstanceKlass::signature_name_of(char c) const {
2735 int hash_len = 0;
2736 char hash_buf[40];
2737
2738 // If this is an unsafe anonymous class, append a hash to make the name unique
2739 if (is_unsafe_anonymous()) {
2740 intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0;
2741 jio_snprintf(hash_buf, sizeof(hash_buf), "/" UINTX_FORMAT, (uintx)hash);
2742 hash_len = (int)strlen(hash_buf);
2743 }
2744
2745 // Get the internal name as a c string
2746 const char* src = (const char*) (name()->as_C_string());
2747 const int src_length = (int)strlen(src);
2748
2749 char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3);
2750
2751 // Add L or Q as type indicator
2752 int dest_index = 0;
2753 dest[dest_index++] = c;
2754
2755 // Add the actual class name
2756 for (int src_index = 0; src_index < src_length; ) {
2757 dest[dest_index++] = src[src_index++];
2758 }
2759
2760 // If we have a hash, append it
2761 for (int hash_index = 0; hash_index < hash_len; ) {
2762 dest[dest_index++] = hash_buf[hash_index++];
2763 }
2764
2765 // Add the semicolon and the NULL
2766 dest[dest_index++] = JVM_SIGNATURE_ENDCLASS;
2767 dest[dest_index] = '\0';
2768 return dest;
2769 }
2770
2771 // Used to obtain the package name from a fully qualified class name.
2772 Symbol* InstanceKlass::package_from_name(const Symbol* name, TRAPS) {
2773 if (name == NULL) {
2774 return NULL;
2775 } else {
2776 if (name->utf8_length() <= 0) {
2777 return NULL;
2778 }
2779 ResourceMark rm;
2780 const char* package_name = ClassLoader::package_from_name((const char*) name->as_C_string());
2781 if (package_name == NULL) {
2782 return NULL;
2783 }
2784 Symbol* pkg_name = SymbolTable::new_symbol(package_name);
2785 return pkg_name;
2786 }
2787 }
2788
2789 ModuleEntry* InstanceKlass::module() const {
2790 // For an unsafe anonymous class return the host class' module
2791 if (is_unsafe_anonymous()) {
2792 assert(unsafe_anonymous_host() != NULL, "unsafe anonymous class must have a host class");
2793 return unsafe_anonymous_host()->module();
2794 }
2795
2796 // Class is in a named package
2797 if (!in_unnamed_package()) {
2798 return _package_entry->module();
2799 }
2800
2801 // Class is in an unnamed package, return its loader's unnamed module
2802 return class_loader_data()->unnamed_module();
2803 }
2804
2805 void InstanceKlass::set_package(ClassLoaderData* loader_data, TRAPS) {
2806
2807 // ensure java/ packages only loaded by boot or platform builtin loaders
2808 check_prohibited_package(name(), loader_data, CHECK);
2809
2810 TempNewSymbol pkg_name = package_from_name(name(), CHECK);
2811
2812 if (pkg_name != NULL && loader_data != NULL) {
2813
2814 // Find in class loader's package entry table.
2815 _package_entry = loader_data->packages()->lookup_only(pkg_name);
2816
2817 // If the package name is not found in the loader's package
2818 // entry table, it is an indication that the package has not
2819 // been defined. Consider it defined within the unnamed module.
2820 if (_package_entry == NULL) {
2821 ResourceMark rm;
2822
2823 if (!ModuleEntryTable::javabase_defined()) {
2824 // Before java.base is defined during bootstrapping, define all packages in
2825 // the java.base module. If a non-java.base package is erroneously placed
2826 // in the java.base module it will be caught later when java.base
2827 // is defined by ModuleEntryTable::verify_javabase_packages check.
2828 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, JAVA_BASE_NAME " module is NULL");
2829 _package_entry = loader_data->packages()->lookup(pkg_name, ModuleEntryTable::javabase_moduleEntry());
2830 } else {
2831 assert(loader_data->unnamed_module() != NULL, "unnamed module is NULL");
2832 _package_entry = loader_data->packages()->lookup(pkg_name,
2833 loader_data->unnamed_module());
2834 }
2835
2836 // A package should have been successfully created
2837 assert(_package_entry != NULL, "Package entry for class %s not found, loader %s",
2838 name()->as_C_string(), loader_data->loader_name_and_id());
2839 }
2840
2841 if (log_is_enabled(Debug, module)) {
2842 ResourceMark rm;
2843 ModuleEntry* m = _package_entry->module();
2844 log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s",
2845 external_name(),
2846 pkg_name->as_C_string(),
2847 loader_data->loader_name_and_id(),
2848 (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE));
2849 }
2850 } else {
2851 ResourceMark rm;
2852 log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s",
2853 external_name(),
2854 (loader_data != NULL) ? loader_data->loader_name_and_id() : "NULL",
2855 UNNAMED_MODULE);
2856 }
2857 }
2858
2859
2860 // different versions of is_same_class_package
2861
2862 bool InstanceKlass::is_same_class_package(const Klass* class2) const {
2863 oop classloader1 = this->class_loader();
2864 PackageEntry* classpkg1 = this->package();
2865 if (class2->is_objArray_klass()) {
2866 class2 = ObjArrayKlass::cast(class2)->bottom_klass();
2867 }
2868
2869 oop classloader2;
2870 PackageEntry* classpkg2;
2871 if (class2->is_instance_klass()) {
2872 classloader2 = class2->class_loader();
2873 classpkg2 = class2->package();
2874 } else {
2875 assert(class2->is_typeArray_klass(), "should be type array");
2876 classloader2 = NULL;
2877 classpkg2 = NULL;
2878 }
2879
2880 // Same package is determined by comparing class loader
2881 // and package entries. Both must be the same. This rule
2882 // applies even to classes that are defined in the unnamed
2883 // package, they still must have the same class loader.
2884 if ((classloader1 == classloader2) && (classpkg1 == classpkg2)) {
2885 return true;
2886 }
2887
2888 return false;
2889 }
2890
2891 // return true if this class and other_class are in the same package. Classloader
2892 // and classname information is enough to determine a class's package
2893 bool InstanceKlass::is_same_class_package(oop other_class_loader,
2894 const Symbol* other_class_name) const {
2895 if (class_loader() != other_class_loader) {
2896 return false;
2897 }
2898 if (name()->fast_compare(other_class_name) == 0) {
2899 return true;
2900 }
2901
2902 {
2903 ResourceMark rm;
2904
2905 bool bad_class_name = false;
2906 const char* other_pkg =
2907 ClassLoader::package_from_name((const char*) other_class_name->as_C_string(), &bad_class_name);
2908 if (bad_class_name) {
2909 return false;
2910 }
2911 // Check that package_from_name() returns NULL, not "", if there is no package.
2912 assert(other_pkg == NULL || strlen(other_pkg) > 0, "package name is empty string");
2913
2914 const Symbol* const this_package_name =
2915 this->package() != NULL ? this->package()->name() : NULL;
2916
2917 if (this_package_name == NULL || other_pkg == NULL) {
2918 // One of the two doesn't have a package. Only return true if the other
2919 // one also doesn't have a package.
2920 return (const char*)this_package_name == other_pkg;
2921 }
2922
2923 // Check if package is identical
2924 return this_package_name->equals(other_pkg);
2925 }
2926 }
2927
2928 // Returns true iff super_method can be overridden by a method in targetclassname
2929 // See JLS 3rd edition 8.4.6.1
2930 // Assumes name-signature match
2931 // "this" is InstanceKlass of super_method which must exist
2932 // note that the InstanceKlass of the method in the targetclassname has not always been created yet
2933 bool InstanceKlass::is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) {
2934 // Private methods can not be overridden
2935 if (super_method->is_private()) {
2936 return false;
2937 }
2938 // If super method is accessible, then override
2939 if ((super_method->is_protected()) ||
2940 (super_method->is_public())) {
2941 return true;
2942 }
2943 // Package-private methods are not inherited outside of package
2944 assert(super_method->is_package_private(), "must be package private");
2945 return(is_same_class_package(targetclassloader(), targetclassname));
2946 }
2947
2948 // Only boot and platform class loaders can define classes in "java/" packages.
2949 void InstanceKlass::check_prohibited_package(Symbol* class_name,
2950 ClassLoaderData* loader_data,
2951 TRAPS) {
2952 if (!loader_data->is_boot_class_loader_data() &&
2953 !loader_data->is_platform_class_loader_data() &&
2954 class_name != NULL) {
2955 ResourceMark rm(THREAD);
2956 char* name = class_name->as_C_string();
2957 if (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/') {
2958 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK);
2959 assert(pkg_name != NULL, "Error in parsing package name starting with 'java/'");
2960 name = pkg_name->as_C_string();
2961 const char* class_loader_name = loader_data->loader_name_and_id();
2962 StringUtils::replace_no_expand(name, "/", ".");
2963 const char* msg_text1 = "Class loader (instance of): ";
2964 const char* msg_text2 = " tried to load prohibited package name: ";
2965 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1;
2966 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
2967 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name);
2968 THROW_MSG(vmSymbols::java_lang_SecurityException(), message);
2969 }
2970 }
2971 return;
2972 }
2973
2974 bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const {
2975 constantPoolHandle i_cp(THREAD, constants());
2976 for (InnerClassesIterator iter(this); !iter.done(); iter.next()) {
2977 int ioff = iter.inner_class_info_index();
2978 if (ioff != 0) {
2979 // Check to see if the name matches the class we're looking for
2980 // before attempting to find the class.
2981 if (i_cp->klass_name_at_matches(this, ioff)) {
2982 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false);
2983 if (this == inner_klass) {
2984 *ooff = iter.outer_class_info_index();
2985 *noff = iter.inner_name_index();
2986 return true;
2987 }
2988 }
2989 }
2990 }
2991 return false;
2992 }
2993
2994 InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const {
2995 InstanceKlass* outer_klass = NULL;
2996 *inner_is_member = false;
2997 int ooff = 0, noff = 0;
2998 bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD);
2999 if (has_inner_classes_attr) {
3000 constantPoolHandle i_cp(THREAD, constants());
3001 if (ooff != 0) {
3002 Klass* ok = i_cp->klass_at(ooff, CHECK_NULL);
3003 outer_klass = InstanceKlass::cast(ok);
3004 *inner_is_member = true;
3005 }
3006 if (NULL == outer_klass) {
3007 // It may be unsafe anonymous; try for that.
3008 int encl_method_class_idx = enclosing_method_class_index();
3009 if (encl_method_class_idx != 0) {
3010 Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
3011 outer_klass = InstanceKlass::cast(ok);
3012 *inner_is_member = false;
3013 }
3014 }
3015 }
3016
3017 // If no inner class attribute found for this class.
3018 if (NULL == outer_klass) return NULL;
3019
3020 // Throws an exception if outer klass has not declared k as an inner klass
3021 // We need evidence that each klass knows about the other, or else
3022 // the system could allow a spoof of an inner class to gain access rights.
3023 Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL);
3024 return outer_klass;
3025 }
3026
3027 jint InstanceKlass::compute_modifier_flags(TRAPS) const {
3028 jint access = access_flags().as_int();
3029
3030 // But check if it happens to be member class.
3031 InnerClassesIterator iter(this);
3032 for (; !iter.done(); iter.next()) {
3033 int ioff = iter.inner_class_info_index();
3034 // Inner class attribute can be zero, skip it.
3035 // Strange but true: JVM spec. allows null inner class refs.
3036 if (ioff == 0) continue;
3037
3038 // only look at classes that are already loaded
3039 // since we are looking for the flags for our self.
3040 Symbol* inner_name = constants()->klass_name_at(ioff);
3041 if (name() == inner_name) {
3042 // This is really a member class.
3043 access = iter.inner_access_flags();
3044 break;
3045 }
3046 }
3047 // Remember to strip ACC_SUPER bit
3048 return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS;
3049 }
3050
3051 jint InstanceKlass::jvmti_class_status() const {
3052 jint result = 0;
3053
3054 if (is_linked()) {
3055 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
3056 }
3057
3058 if (is_initialized()) {
3059 assert(is_linked(), "Class status is not consistent");
3060 result |= JVMTI_CLASS_STATUS_INITIALIZED;
3061 }
3062 if (is_in_error_state()) {
3063 result |= JVMTI_CLASS_STATUS_ERROR;
3064 }
3065 return result;
3066 }
3067
3068 Method* InstanceKlass::method_at_itable(Klass* holder, int index, TRAPS) {
3069 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
3070 int method_table_offset_in_words = ioe->offset()/wordSize;
3071 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
3072 / itableOffsetEntry::size();
3073
3074 for (int cnt = 0 ; ; cnt ++, ioe ++) {
3075 // If the interface isn't implemented by the receiver class,
3076 // the VM should throw IncompatibleClassChangeError.
3077 if (cnt >= nof_interfaces) {
3078 ResourceMark rm(THREAD);
3079 stringStream ss;
3080 bool same_module = (module() == holder->module());
3081 ss.print("Receiver class %s does not implement "
3082 "the interface %s defining the method to be called "
3083 "(%s%s%s)",
3084 external_name(), holder->external_name(),
3085 (same_module) ? joint_in_module_of_loader(holder) : class_in_module_of_loader(),
3086 (same_module) ? "" : "; ",
3087 (same_module) ? "" : holder->class_in_module_of_loader());
3088 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
3089 }
3090
3091 Klass* ik = ioe->interface_klass();
3092 if (ik == holder) break;
3093 }
3094
3095 itableMethodEntry* ime = ioe->first_method_entry(this);
3096 Method* m = ime[index].method();
3097 if (m == NULL) {
3098 THROW_NULL(vmSymbols::java_lang_AbstractMethodError());
3099 }
3100 return m;
3101 }
3102
3103
3104 #if INCLUDE_JVMTI
3105 // update default_methods for redefineclasses for methods that are
3106 // not yet in the vtable due to concurrent subclass define and superinterface
3107 // redefinition
3108 // Note: those in the vtable, should have been updated via adjust_method_entries
3109 void InstanceKlass::adjust_default_methods(bool* trace_name_printed) {
3110 // search the default_methods for uses of either obsolete or EMCP methods
3111 if (default_methods() != NULL) {
3112 for (int index = 0; index < default_methods()->length(); index ++) {
3113 Method* old_method = default_methods()->at(index);
3114 if (old_method == NULL || !old_method->is_old()) {
3115 continue; // skip uninteresting entries
3116 }
3117 assert(!old_method->is_deleted(), "default methods may not be deleted");
3118 Method* new_method = old_method->get_new_method();
3119 default_methods()->at_put(index, new_method);
3120
3121 if (log_is_enabled(Info, redefine, class, update)) {
3122 ResourceMark rm;
3123 if (!(*trace_name_printed)) {
3124 log_info(redefine, class, update)
3125 ("adjust: klassname=%s default methods from name=%s",
3126 external_name(), old_method->method_holder()->external_name());
3127 *trace_name_printed = true;
3128 }
3129 log_debug(redefine, class, update, vtables)
3130 ("default method update: %s(%s) ",
3131 new_method->name()->as_C_string(), new_method->signature()->as_C_string());
3132 }
3133 }
3134 }
3135 }
3136 #endif // INCLUDE_JVMTI
3137
3138 // On-stack replacement stuff
3139 void InstanceKlass::add_osr_nmethod(nmethod* n) {
3140 assert_lock_strong(CompiledMethod_lock);
3141 #ifndef PRODUCT
3142 if (TieredCompilation) {
3143 nmethod * prev = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), n->comp_level(), true);
3144 assert(prev == NULL || !prev->is_in_use(),
3145 "redundunt OSR recompilation detected. memory leak in CodeCache!");
3146 }
3147 #endif
3148 // only one compilation can be active
3149 {
3150 assert(n->is_osr_method(), "wrong kind of nmethod");
3151 n->set_osr_link(osr_nmethods_head());
3152 set_osr_nmethods_head(n);
3153 // Raise the highest osr level if necessary
3154 if (TieredCompilation) {
3155 Method* m = n->method();
3156 m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level()));
3157 }
3158 }
3159
3160 // Get rid of the osr methods for the same bci that have lower levels.
3161 if (TieredCompilation) {
3162 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) {
3163 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true);
3164 if (inv != NULL && inv->is_in_use()) {
3165 inv->make_not_entrant();
3166 }
3167 }
3168 }
3169 }
3170
3171 // Remove osr nmethod from the list. Return true if found and removed.
3172 bool InstanceKlass::remove_osr_nmethod(nmethod* n) {
3173 // This is a short non-blocking critical region, so the no safepoint check is ok.
3174 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock
3175 , Mutex::_no_safepoint_check_flag);
3176 assert(n->is_osr_method(), "wrong kind of nmethod");
3177 nmethod* last = NULL;
3178 nmethod* cur = osr_nmethods_head();
3179 int max_level = CompLevel_none; // Find the max comp level excluding n
3180 Method* m = n->method();
3181 // Search for match
3182 bool found = false;
3183 while(cur != NULL && cur != n) {
3184 if (TieredCompilation && m == cur->method()) {
3185 // Find max level before n
3186 max_level = MAX2(max_level, cur->comp_level());
3187 }
3188 last = cur;
3189 cur = cur->osr_link();
3190 }
3191 nmethod* next = NULL;
3192 if (cur == n) {
3193 found = true;
3194 next = cur->osr_link();
3195 if (last == NULL) {
3196 // Remove first element
3197 set_osr_nmethods_head(next);
3198 } else {
3199 last->set_osr_link(next);
3200 }
3201 }
3202 n->set_osr_link(NULL);
3203 if (TieredCompilation) {
3204 cur = next;
3205 while (cur != NULL) {
3206 // Find max level after n
3207 if (m == cur->method()) {
3208 max_level = MAX2(max_level, cur->comp_level());
3209 }
3210 cur = cur->osr_link();
3211 }
3212 m->set_highest_osr_comp_level(max_level);
3213 }
3214 return found;
3215 }
3216
3217 int InstanceKlass::mark_osr_nmethods(const Method* m) {
3218 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock,
3219 Mutex::_no_safepoint_check_flag);
3220 nmethod* osr = osr_nmethods_head();
3221 int found = 0;
3222 while (osr != NULL) {
3223 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3224 if (osr->method() == m) {
3225 osr->mark_for_deoptimization();
3226 found++;
3227 }
3228 osr = osr->osr_link();
3229 }
3230 return found;
3231 }
3232
3233 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
3234 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock,
3235 Mutex::_no_safepoint_check_flag);
3236 nmethod* osr = osr_nmethods_head();
3237 nmethod* best = NULL;
3238 while (osr != NULL) {
3239 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3240 // There can be a time when a c1 osr method exists but we are waiting
3241 // for a c2 version. When c2 completes its osr nmethod we will trash
3242 // the c1 version and only be able to find the c2 version. However
3243 // while we overflow in the c1 code at back branches we don't want to
3244 // try and switch to the same code as we are already running
3245
3246 if (osr->method() == m &&
3247 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
3248 if (match_level) {
3249 if (osr->comp_level() == comp_level) {
3250 // Found a match - return it.
3251 return osr;
3252 }
3253 } else {
3254 if (best == NULL || (osr->comp_level() > best->comp_level())) {
3255 if (osr->comp_level() == CompLevel_highest_tier) {
3256 // Found the best possible - return it.
3257 return osr;
3258 }
3259 best = osr;
3260 }
3261 }
3262 }
3263 osr = osr->osr_link();
3264 }
3265
3266 assert(match_level == false || best == NULL, "shouldn't pick up anything if match_level is set");
3267 if (best != NULL && best->comp_level() >= comp_level) {
3268 return best;
3269 }
3270 return NULL;
3271 }
3272
3273 // -----------------------------------------------------------------------------------------------------
3274 // Printing
3275
3276 #ifndef PRODUCT
3277
3278 #define BULLET " - "
3279
3280 static const char* state_names[] = {
3281 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
3282 };
3283
3284 static void print_vtable(address self, intptr_t* start, int len, outputStream* st) {
3285 ResourceMark rm;
3286 int* forward_refs = NEW_RESOURCE_ARRAY(int, len);
3287 for (int i = 0; i < len; i++) forward_refs[i] = 0;
3288 for (int i = 0; i < len; i++) {
3289 intptr_t e = start[i];
3290 st->print("%d : " INTPTR_FORMAT, i, e);
3291 if (forward_refs[i] != 0) {
3292 int from = forward_refs[i];
3293 int off = (int) start[from];
3294 st->print(" (offset %d <= [%d])", off, from);
3295 }
3296 if (MetaspaceObj::is_valid((Metadata*)e)) {
3297 st->print(" ");
3298 ((Metadata*)e)->print_value_on(st);
3299 } else if (self != NULL && e > 0 && e < 0x10000) {
3300 address location = self + e;
3301 int index = (int)((intptr_t*)location - start);
3302 st->print(" (offset %d => [%d])", (int)e, index);
3303 if (index >= 0 && index < len)
3304 forward_refs[index] = i;
3305 }
3306 st->cr();
3307 }
3308 }
3309
3310 static void print_vtable(vtableEntry* start, int len, outputStream* st) {
3311 return print_vtable(NULL, reinterpret_cast<intptr_t*>(start), len, st);
3312 }
3313
3314 template<typename T>
3315 static void print_array_on(outputStream* st, Array<T>* array) {
3316 if (array == NULL) { st->print_cr("NULL"); return; }
3317 array->print_value_on(st); st->cr();
3318 if (Verbose || WizardMode) {
3319 for (int i = 0; i < array->length(); i++) {
3320 st->print("%d : ", i); array->at(i)->print_value_on(st); st->cr();
3321 }
3322 }
3323 }
3324
3325 static void print_array_on(outputStream* st, Array<int>* array) {
3326 if (array == NULL) { st->print_cr("NULL"); return; }
3327 array->print_value_on(st); st->cr();
3328 if (Verbose || WizardMode) {
3329 for (int i = 0; i < array->length(); i++) {
3330 st->print("%d : %d", i, array->at(i)); st->cr();
3331 }
3332 }
3333 }
3334
3335 void InstanceKlass::print_on(outputStream* st) const {
3336 assert(is_klass(), "must be klass");
3337 Klass::print_on(st);
3338
3339 st->print(BULLET"instance size: %d", size_helper()); st->cr();
3340 st->print(BULLET"klass size: %d", size()); st->cr();
3341 st->print(BULLET"access: "); access_flags().print_on(st); st->cr();
3342 st->print(BULLET"misc flags: 0x%x", _misc_flags); st->cr();
3343 st->print(BULLET"state: "); st->print_cr("%s", state_names[_init_state]);
3344 st->print(BULLET"name: "); name()->print_value_on(st); st->cr();
3345 st->print(BULLET"super: "); Metadata::print_value_on_maybe_null(st, super()); st->cr();
3346 st->print(BULLET"sub: ");
3347 Klass* sub = subklass();
3348 int n;
3349 for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) {
3350 if (n < MaxSubklassPrintSize) {
3351 sub->print_value_on(st);
3352 st->print(" ");
3353 }
3354 }
3355 if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize);
3356 st->cr();
3357
3358 if (is_interface()) {
3359 st->print_cr(BULLET"nof implementors: %d", nof_implementors());
3360 if (nof_implementors() == 1) {
3361 st->print_cr(BULLET"implementor: ");
3362 st->print(" ");
3363 implementor()->print_value_on(st);
3364 st->cr();
3365 }
3366 }
3367
3368 st->print(BULLET"arrays: "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr();
3369 st->print(BULLET"methods: "); print_array_on(st, methods());
3370 st->print(BULLET"method ordering: "); print_array_on(st, method_ordering());
3371 st->print(BULLET"default_methods: "); print_array_on(st, default_methods());
3372 if (default_vtable_indices() != NULL) {
3373 st->print(BULLET"default vtable indices: "); print_array_on(st, default_vtable_indices());
3374 }
3375 st->print(BULLET"local interfaces: "); print_array_on(st, local_interfaces());
3376 st->print(BULLET"trans. interfaces: "); print_array_on(st, transitive_interfaces());
3377 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr();
3378 if (class_loader_data() != NULL) {
3379 st->print(BULLET"class loader data: ");
3380 class_loader_data()->print_value_on(st);
3381 st->cr();
3382 }
3383 st->print(BULLET"unsafe anonymous host class: "); Metadata::print_value_on_maybe_null(st, unsafe_anonymous_host()); st->cr();
3384 if (source_file_name() != NULL) {
3385 st->print(BULLET"source file: ");
3386 source_file_name()->print_value_on(st);
3387 st->cr();
3388 }
3389 if (source_debug_extension() != NULL) {
3390 st->print(BULLET"source debug extension: ");
3391 st->print("%s", source_debug_extension());
3392 st->cr();
3393 }
3394 st->print(BULLET"class annotations: "); class_annotations()->print_value_on(st); st->cr();
3395 st->print(BULLET"class type annotations: "); class_type_annotations()->print_value_on(st); st->cr();
3396 st->print(BULLET"field annotations: "); fields_annotations()->print_value_on(st); st->cr();
3397 st->print(BULLET"field type annotations: "); fields_type_annotations()->print_value_on(st); st->cr();
3398 {
3399 bool have_pv = false;
3400 // previous versions are linked together through the InstanceKlass
3401 for (InstanceKlass* pv_node = previous_versions();
3402 pv_node != NULL;
3403 pv_node = pv_node->previous_versions()) {
3404 if (!have_pv)
3405 st->print(BULLET"previous version: ");
3406 have_pv = true;
3407 pv_node->constants()->print_value_on(st);
3408 }
3409 if (have_pv) st->cr();
3410 }
3411
3412 if (generic_signature() != NULL) {
3413 st->print(BULLET"generic signature: ");
3414 generic_signature()->print_value_on(st);
3415 st->cr();
3416 }
3417 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr();
3418 st->print(BULLET"nest members: "); nest_members()->print_value_on(st); st->cr();
3419 if (java_mirror() != NULL) {
3420 st->print(BULLET"java mirror: ");
3421 java_mirror()->print_value_on(st);
3422 st->cr();
3423 } else {
3424 st->print_cr(BULLET"java mirror: NULL");
3425 }
3426 st->print(BULLET"vtable length %d (start addr: " INTPTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
3427 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st);
3428 st->print(BULLET"itable length %d (start addr: " INTPTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
3429 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(NULL, start_of_itable(), itable_length(), st);
3430 st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
3431 FieldPrinter print_static_field(st);
3432 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
3433 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
3434 FieldPrinter print_nonstatic_field(st);
3435 InstanceKlass* ik = const_cast<InstanceKlass*>(this);
3436 ik->do_nonstatic_fields(&print_nonstatic_field);
3437
3438 st->print(BULLET"non-static oop maps: ");
3439 OopMapBlock* map = start_of_nonstatic_oop_maps();
3440 OopMapBlock* end_map = map + nonstatic_oop_map_count();
3441 while (map < end_map) {
3442 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
3443 map++;
3444 }
3445 st->cr();
3446 }
3447
3448 #endif //PRODUCT
3449
3450 void InstanceKlass::print_value_on(outputStream* st) const {
3451 assert(is_klass(), "must be klass");
3452 if (Verbose || WizardMode) access_flags().print_on(st);
3453 name()->print_value_on(st);
3454 }
3455
3456 #ifndef PRODUCT
3457
3458 void FieldPrinter::do_field(fieldDescriptor* fd) {
3459 _st->print(BULLET);
3460 if (_obj == NULL) {
3461 fd->print_on(_st);
3462 _st->cr();
3463 } else {
3464 fd->print_on_for(_st, _obj);
3465 _st->cr();
3466 }
3467 }
3468
3469
3470 void InstanceKlass::oop_print_on(oop obj, outputStream* st) {
3471 Klass::oop_print_on(obj, st);
3472
3473 if (this == SystemDictionary::String_klass()) {
3474 typeArrayOop value = java_lang_String::value(obj);
3475 juint length = java_lang_String::length(obj);
3476 if (value != NULL &&
3477 value->is_typeArray() &&
3478 length <= (juint) value->length()) {
3479 st->print(BULLET"string: ");
3480 java_lang_String::print(obj, st);
3481 st->cr();
3482 if (!WizardMode) return; // that is enough
3483 }
3484 }
3485
3486 st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj));
3487 FieldPrinter print_field(st, obj);
3488 do_nonstatic_fields(&print_field);
3489
3490 if (this == SystemDictionary::Class_klass()) {
3491 st->print(BULLET"signature: ");
3492 java_lang_Class::print_signature(obj, st);
3493 st->cr();
3494 Klass* mirrored_klass = java_lang_Class::as_Klass(obj);
3495 st->print(BULLET"fake entry for mirror: ");
3496 Metadata::print_value_on_maybe_null(st, mirrored_klass);
3497 st->cr();
3498 Klass* array_klass = java_lang_Class::array_klass_acquire(obj);
3499 st->print(BULLET"fake entry for array: ");
3500 Metadata::print_value_on_maybe_null(st, array_klass);
3501 st->cr();
3502 st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj));
3503 st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj));
3504 Klass* real_klass = java_lang_Class::as_Klass(obj);
3505 if (real_klass != NULL && real_klass->is_instance_klass()) {
3506 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
3507 }
3508 } else if (this == SystemDictionary::MethodType_klass()) {
3509 st->print(BULLET"signature: ");
3510 java_lang_invoke_MethodType::print_signature(obj, st);
3511 st->cr();
3512 }
3513 }
3514
3515 bool InstanceKlass::verify_itable_index(int i) {
3516 int method_count = klassItable::method_count_for_interface(this);
3517 assert(i >= 0 && i < method_count, "index out of bounds");
3518 return true;
3519 }
3520
3521 #endif //PRODUCT
3522
3523 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
3524 st->print("a ");
3525 name()->print_value_on(st);
3526 obj->print_address_on(st);
3527 if (this == SystemDictionary::String_klass()
3528 && java_lang_String::value(obj) != NULL) {
3529 ResourceMark rm;
3530 int len = java_lang_String::length(obj);
3531 int plen = (len < 24 ? len : 12);
3532 char* str = java_lang_String::as_utf8_string(obj, 0, plen);
3533 st->print(" = \"%s\"", str);
3534 if (len > plen)
3535 st->print("...[%d]", len);
3536 } else if (this == SystemDictionary::Class_klass()) {
3537 Klass* k = java_lang_Class::as_Klass(obj);
3538 st->print(" = ");
3539 if (k != NULL) {
3540 k->print_value_on(st);
3541 } else {
3542 const char* tname = type2name(java_lang_Class::primitive_type(obj));
3543 st->print("%s", tname ? tname : "type?");
3544 }
3545 } else if (this == SystemDictionary::MethodType_klass()) {
3546 st->print(" = ");
3547 java_lang_invoke_MethodType::print_signature(obj, st);
3548 } else if (java_lang_boxing_object::is_instance(obj)) {
3549 st->print(" = ");
3550 java_lang_boxing_object::print(obj, st);
3551 } else if (this == SystemDictionary::LambdaForm_klass()) {
3552 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
3553 if (vmentry != NULL) {
3554 st->print(" => ");
3555 vmentry->print_value_on(st);
3556 }
3557 } else if (this == SystemDictionary::MemberName_klass()) {
3558 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
3559 if (vmtarget != NULL) {
3560 st->print(" = ");
3561 vmtarget->print_value_on(st);
3562 } else {
3563 java_lang_invoke_MemberName::clazz(obj)->print_value_on(st);
3564 st->print(".");
3565 java_lang_invoke_MemberName::name(obj)->print_value_on(st);
3566 }
3567 }
3568 }
3569
3570 const char* InstanceKlass::internal_name() const {
3571 return external_name();
3572 }
3573
3574 void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data,
3575 const char* module_name,
3576 const ClassFileStream* cfs) const {
3577 if (!log_is_enabled(Info, class, load)) {
3578 return;
3579 }
3580
3581 ResourceMark rm;
3582 LogMessage(class, load) msg;
3583 stringStream info_stream;
3584
3585 // Name and class hierarchy info
3586 info_stream.print("%s", external_name());
3587
3588 // Source
3589 if (cfs != NULL) {
3590 if (cfs->source() != NULL) {
3591 if (module_name != NULL) {
3592 // When the boot loader created the stream, it didn't know the module name
3593 // yet. Let's format it now.
3594 if (cfs->from_boot_loader_modules_image()) {
3595 info_stream.print(" source: jrt:/%s", module_name);
3596 } else {
3597 info_stream.print(" source: %s", cfs->source());
3598 }
3599 } else {
3600 info_stream.print(" source: %s", cfs->source());
3601 }
3602 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) {
3603 Thread* THREAD = Thread::current();
3604 Klass* caller =
3605 THREAD->is_Java_thread()
3606 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
3607 : NULL;
3608 // caller can be NULL, for example, during a JVMTI VM_Init hook
3609 if (caller != NULL) {
3610 info_stream.print(" source: instance of %s", caller->external_name());
3611 } else {
3612 // source is unknown
3613 }
3614 } else {
3615 oop class_loader = loader_data->class_loader();
3616 info_stream.print(" source: %s", class_loader->klass()->external_name());
3617 }
3618 } else {
3619 assert(this->is_shared(), "must be");
3620 if (MetaspaceShared::is_shared_dynamic((void*)this)) {
3621 info_stream.print(" source: shared objects file (top)");
3622 } else {
3623 info_stream.print(" source: shared objects file");
3624 }
3625 }
3626
3627 msg.info("%s", info_stream.as_string());
3628
3629 if (log_is_enabled(Debug, class, load)) {
3630 stringStream debug_stream;
3631
3632 // Class hierarchy info
3633 debug_stream.print(" klass: " INTPTR_FORMAT " super: " INTPTR_FORMAT,
3634 p2i(this), p2i(superklass()));
3635
3636 // Interfaces
3637 if (local_interfaces() != NULL && local_interfaces()->length() > 0) {
3638 debug_stream.print(" interfaces:");
3639 int length = local_interfaces()->length();
3640 for (int i = 0; i < length; i++) {
3641 debug_stream.print(" " INTPTR_FORMAT,
3642 p2i(InstanceKlass::cast(local_interfaces()->at(i))));
3643 }
3644 }
3645
3646 // Class loader
3647 debug_stream.print(" loader: [");
3648 loader_data->print_value_on(&debug_stream);
3649 debug_stream.print("]");
3650
3651 // Classfile checksum
3652 if (cfs) {
3653 debug_stream.print(" bytes: %d checksum: %08x",
3654 cfs->length(),
3655 ClassLoader::crc32(0, (const char*)cfs->buffer(),
3656 cfs->length()));
3657 }
3658
3659 msg.debug("%s", debug_stream.as_string());
3660 }
3661 }
3662
3663 #if INCLUDE_SERVICES
3664 // Size Statistics
3665 void InstanceKlass::collect_statistics(KlassSizeStats *sz) const {
3666 Klass::collect_statistics(sz);
3667
3668 sz->_inst_size = wordSize * size_helper();
3669 sz->_vtab_bytes = wordSize * vtable_length();
3670 sz->_itab_bytes = wordSize * itable_length();
3671 sz->_nonstatic_oopmap_bytes = wordSize * nonstatic_oop_map_size();
3672
3673 int n = 0;
3674 n += (sz->_methods_array_bytes = sz->count_array(methods()));
3675 n += (sz->_method_ordering_bytes = sz->count_array(method_ordering()));
3676 n += (sz->_local_interfaces_bytes = sz->count_array(local_interfaces()));
3677 n += (sz->_transitive_interfaces_bytes = sz->count_array(transitive_interfaces()));
3678 n += (sz->_fields_bytes = sz->count_array(fields()));
3679 n += (sz->_inner_classes_bytes = sz->count_array(inner_classes()));
3680 n += (sz->_nest_members_bytes = sz->count_array(nest_members()));
3681 sz->_ro_bytes += n;
3682
3683 const ConstantPool* cp = constants();
3684 if (cp) {
3685 cp->collect_statistics(sz);
3686 }
3687
3688 const Annotations* anno = annotations();
3689 if (anno) {
3690 anno->collect_statistics(sz);
3691 }
3692
3693 const Array<Method*>* methods_array = methods();
3694 if (methods()) {
3695 for (int i = 0; i < methods_array->length(); i++) {
3696 Method* method = methods_array->at(i);
3697 if (method) {
3698 sz->_method_count ++;
3699 method->collect_statistics(sz);
3700 }
3701 }
3702 }
3703 }
3704 #endif // INCLUDE_SERVICES
3705
3706 // Verification
3707
3708 class VerifyFieldClosure: public BasicOopIterateClosure {
3709 protected:
3710 template <class T> void do_oop_work(T* p) {
3711 oop obj = RawAccess<>::oop_load(p);
3712 if (!oopDesc::is_oop_or_null(obj)) {
3713 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj));
3714 Universe::print_on(tty);
3715 guarantee(false, "boom");
3716 }
3717 }
3718 public:
3719 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); }
3720 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
3721 };
3722
3723 void InstanceKlass::verify_on(outputStream* st) {
3724 #ifndef PRODUCT
3725 // Avoid redundant verifies, this really should be in product.
3726 if (_verify_count == Universe::verify_count()) return;
3727 _verify_count = Universe::verify_count();
3728 #endif
3729
3730 // Verify Klass
3731 Klass::verify_on(st);
3732
3733 // Verify that klass is present in ClassLoaderData
3734 guarantee(class_loader_data()->contains_klass(this),
3735 "this class isn't found in class loader data");
3736
3737 // Verify vtables
3738 if (is_linked()) {
3739 // $$$ This used to be done only for m/s collections. Doing it
3740 // always seemed a valid generalization. (DLD -- 6/00)
3741 vtable().verify(st);
3742 }
3743
3744 // Verify first subklass
3745 if (subklass() != NULL) {
3746 guarantee(subklass()->is_klass(), "should be klass");
3747 }
3748
3749 // Verify siblings
3750 Klass* super = this->super();
3751 Klass* sib = next_sibling();
3752 if (sib != NULL) {
3753 if (sib == this) {
3754 fatal("subclass points to itself " PTR_FORMAT, p2i(sib));
3755 }
3756
3757 guarantee(sib->is_klass(), "should be klass");
3758 guarantee(sib->super() == super, "siblings should have same superklass");
3759 }
3760
3761 // Verify local interfaces
3762 if (local_interfaces()) {
3763 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
3764 for (int j = 0; j < local_interfaces->length(); j++) {
3765 InstanceKlass* e = local_interfaces->at(j);
3766 guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
3767 }
3768 }
3769
3770 // Verify transitive interfaces
3771 if (transitive_interfaces() != NULL) {
3772 Array<InstanceKlass*>* transitive_interfaces = this->transitive_interfaces();
3773 for (int j = 0; j < transitive_interfaces->length(); j++) {
3774 InstanceKlass* e = transitive_interfaces->at(j);
3775 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
3776 }
3777 }
3778
3779 // Verify methods
3780 if (methods() != NULL) {
3781 Array<Method*>* methods = this->methods();
3782 for (int j = 0; j < methods->length(); j++) {
3783 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3784 }
3785 for (int j = 0; j < methods->length() - 1; j++) {
3786 Method* m1 = methods->at(j);
3787 Method* m2 = methods->at(j + 1);
3788 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3789 }
3790 }
3791
3792 // Verify method ordering
3793 if (method_ordering() != NULL) {
3794 Array<int>* method_ordering = this->method_ordering();
3795 int length = method_ordering->length();
3796 if (JvmtiExport::can_maintain_original_method_order() ||
3797 ((UseSharedSpaces || Arguments::is_dumping_archive()) && length != 0)) {
3798 guarantee(length == methods()->length(), "invalid method ordering length");
3799 jlong sum = 0;
3800 for (int j = 0; j < length; j++) {
3801 int original_index = method_ordering->at(j);
3802 guarantee(original_index >= 0, "invalid method ordering index");
3803 guarantee(original_index < length, "invalid method ordering index");
3804 sum += original_index;
3805 }
3806 // Verify sum of indices 0,1,...,length-1
3807 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
3808 } else {
3809 guarantee(length == 0, "invalid method ordering length");
3810 }
3811 }
3812
3813 // Verify default methods
3814 if (default_methods() != NULL) {
3815 Array<Method*>* methods = this->default_methods();
3816 for (int j = 0; j < methods->length(); j++) {
3817 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3818 }
3819 for (int j = 0; j < methods->length() - 1; j++) {
3820 Method* m1 = methods->at(j);
3821 Method* m2 = methods->at(j + 1);
3822 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3823 }
3824 }
3825
3826 // Verify JNI static field identifiers
3827 if (jni_ids() != NULL) {
3828 jni_ids()->verify(this);
3829 }
3830
3831 // Verify other fields
3832 if (array_klasses() != NULL) {
3833 guarantee(array_klasses()->is_klass(), "should be klass");
3834 }
3835 if (constants() != NULL) {
3836 guarantee(constants()->is_constantPool(), "should be constant pool");
3837 }
3838 const Klass* anonymous_host = unsafe_anonymous_host();
3839 if (anonymous_host != NULL) {
3840 guarantee(anonymous_host->is_klass(), "should be klass");
3841 }
3842 }
3843
3844 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
3845 Klass::oop_verify_on(obj, st);
3846 VerifyFieldClosure blk;
3847 obj->oop_iterate(&blk);
3848 }
3849
3850
3851 // JNIid class for jfieldIDs only
3852 // Note to reviewers:
3853 // These JNI functions are just moved over to column 1 and not changed
3854 // in the compressed oops workspace.
3855 JNIid::JNIid(Klass* holder, int offset, JNIid* next) {
3856 _holder = holder;
3857 _offset = offset;
3858 _next = next;
3859 debug_only(_is_static_field_id = false;)
3860 }
3861
3862
3863 JNIid* JNIid::find(int offset) {
3864 JNIid* current = this;
3865 while (current != NULL) {
3866 if (current->offset() == offset) return current;
3867 current = current->next();
3868 }
3869 return NULL;
3870 }
3871
3872 void JNIid::deallocate(JNIid* current) {
3873 while (current != NULL) {
3874 JNIid* next = current->next();
3875 delete current;
3876 current = next;
3877 }
3878 }
3879
3880
3881 void JNIid::verify(Klass* holder) {
3882 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields();
3883 int end_field_offset;
3884 end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize);
3885
3886 JNIid* current = this;
3887 while (current != NULL) {
3888 guarantee(current->holder() == holder, "Invalid klass in JNIid");
3889 #ifdef ASSERT
3890 int o = current->offset();
3891 if (current->is_static_field_id()) {
3892 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid");
3893 }
3894 #endif
3895 current = current->next();
3896 }
3897 }
3898
3899 void InstanceKlass::set_init_state(ClassState state) {
3900 #ifdef ASSERT
3901 bool good_state = is_shared() ? (_init_state <= state)
3902 : (_init_state < state);
3903 assert(good_state || state == allocated, "illegal state transition");
3904 #endif
3905 assert(_init_thread == NULL, "should be cleared before state change");
3906 _init_state = (u1)state;
3907 }
3908
3909 #if INCLUDE_JVMTI
3910
3911 // RedefineClasses() support for previous versions
3912
3913 // Globally, there is at least one previous version of a class to walk
3914 // during class unloading, which is saved because old methods in the class
3915 // are still running. Otherwise the previous version list is cleaned up.
3916 bool InstanceKlass::_has_previous_versions = false;
3917
3918 // Returns true if there are previous versions of a class for class
3919 // unloading only. Also resets the flag to false. purge_previous_version
3920 // will set the flag to true if there are any left, i.e., if there's any
3921 // work to do for next time. This is to avoid the expensive code cache
3922 // walk in CLDG::clean_deallocate_lists().
3923 bool InstanceKlass::has_previous_versions_and_reset() {
3924 bool ret = _has_previous_versions;
3925 log_trace(redefine, class, iklass, purge)("Class unloading: has_previous_versions = %s",
3926 ret ? "true" : "false");
3927 _has_previous_versions = false;
3928 return ret;
3929 }
3930
3931 // Purge previous versions before adding new previous versions of the class and
3932 // during class unloading.
3933 void InstanceKlass::purge_previous_version_list() {
3934 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
3935 assert(has_been_redefined(), "Should only be called for main class");
3936
3937 // Quick exit.
3938 if (previous_versions() == NULL) {
3939 return;
3940 }
3941
3942 // This klass has previous versions so see what we can cleanup
3943 // while it is safe to do so.
3944
3945 int deleted_count = 0; // leave debugging breadcrumbs
3946 int live_count = 0;
3947 ClassLoaderData* loader_data = class_loader_data();
3948 assert(loader_data != NULL, "should never be null");
3949
3950 ResourceMark rm;
3951 log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name());
3952
3953 // previous versions are linked together through the InstanceKlass
3954 InstanceKlass* pv_node = previous_versions();
3955 InstanceKlass* last = this;
3956 int version = 0;
3957
3958 // check the previous versions list
3959 for (; pv_node != NULL; ) {
3960
3961 ConstantPool* pvcp = pv_node->constants();
3962 assert(pvcp != NULL, "cp ref was unexpectedly cleared");
3963
3964 if (!pvcp->on_stack()) {
3965 // If the constant pool isn't on stack, none of the methods
3966 // are executing. Unlink this previous_version.
3967 // The previous version InstanceKlass is on the ClassLoaderData deallocate list
3968 // so will be deallocated during the next phase of class unloading.
3969 log_trace(redefine, class, iklass, purge)
3970 ("previous version " INTPTR_FORMAT " is dead.", p2i(pv_node));
3971 // For debugging purposes.
3972 pv_node->set_is_scratch_class();
3973 // Unlink from previous version list.
3974 assert(pv_node->class_loader_data() == loader_data, "wrong loader_data");
3975 InstanceKlass* next = pv_node->previous_versions();
3976 pv_node->link_previous_versions(NULL); // point next to NULL
3977 last->link_previous_versions(next);
3978 // Add to the deallocate list after unlinking
3979 loader_data->add_to_deallocate_list(pv_node);
3980 pv_node = next;
3981 deleted_count++;
3982 version++;
3983 continue;
3984 } else {
3985 log_trace(redefine, class, iklass, purge)("previous version " INTPTR_FORMAT " is alive", p2i(pv_node));
3986 assert(pvcp->pool_holder() != NULL, "Constant pool with no holder");
3987 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
3988 live_count++;
3989 // found a previous version for next time we do class unloading
3990 _has_previous_versions = true;
3991 }
3992
3993 // At least one method is live in this previous version.
3994 // Reset dead EMCP methods not to get breakpoints.
3995 // All methods are deallocated when all of the methods for this class are no
3996 // longer running.
3997 Array<Method*>* method_refs = pv_node->methods();
3998 if (method_refs != NULL) {
3999 log_trace(redefine, class, iklass, purge)("previous methods length=%d", method_refs->length());
4000 for (int j = 0; j < method_refs->length(); j++) {
4001 Method* method = method_refs->at(j);
4002
4003 if (!method->on_stack()) {
4004 // no breakpoints for non-running methods
4005 if (method->is_running_emcp()) {
4006 method->set_running_emcp(false);
4007 }
4008 } else {
4009 assert (method->is_obsolete() || method->is_running_emcp(),
4010 "emcp method cannot run after emcp bit is cleared");
4011 log_trace(redefine, class, iklass, purge)
4012 ("purge: %s(%s): prev method @%d in version @%d is alive",
4013 method->name()->as_C_string(), method->signature()->as_C_string(), j, version);
4014 }
4015 }
4016 }
4017 // next previous version
4018 last = pv_node;
4019 pv_node = pv_node->previous_versions();
4020 version++;
4021 }
4022 log_trace(redefine, class, iklass, purge)
4023 ("previous version stats: live=%d, deleted=%d", live_count, deleted_count);
4024 }
4025
4026 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods,
4027 int emcp_method_count) {
4028 int obsolete_method_count = old_methods->length() - emcp_method_count;
4029
4030 if (emcp_method_count != 0 && obsolete_method_count != 0 &&
4031 _previous_versions != NULL) {
4032 // We have a mix of obsolete and EMCP methods so we have to
4033 // clear out any matching EMCP method entries the hard way.
4034 int local_count = 0;
4035 for (int i = 0; i < old_methods->length(); i++) {
4036 Method* old_method = old_methods->at(i);
4037 if (old_method->is_obsolete()) {
4038 // only obsolete methods are interesting
4039 Symbol* m_name = old_method->name();
4040 Symbol* m_signature = old_method->signature();
4041
4042 // previous versions are linked together through the InstanceKlass
4043 int j = 0;
4044 for (InstanceKlass* prev_version = _previous_versions;
4045 prev_version != NULL;
4046 prev_version = prev_version->previous_versions(), j++) {
4047
4048 Array<Method*>* method_refs = prev_version->methods();
4049 for (int k = 0; k < method_refs->length(); k++) {
4050 Method* method = method_refs->at(k);
4051
4052 if (!method->is_obsolete() &&
4053 method->name() == m_name &&
4054 method->signature() == m_signature) {
4055 // The current RedefineClasses() call has made all EMCP
4056 // versions of this method obsolete so mark it as obsolete
4057 log_trace(redefine, class, iklass, add)
4058 ("%s(%s): flush obsolete method @%d in version @%d",
4059 m_name->as_C_string(), m_signature->as_C_string(), k, j);
4060
4061 method->set_is_obsolete();
4062 break;
4063 }
4064 }
4065
4066 // The previous loop may not find a matching EMCP method, but
4067 // that doesn't mean that we can optimize and not go any
4068 // further back in the PreviousVersion generations. The EMCP
4069 // method for this generation could have already been made obsolete,
4070 // but there still may be an older EMCP method that has not
4071 // been made obsolete.
4072 }
4073
4074 if (++local_count >= obsolete_method_count) {
4075 // no more obsolete methods so bail out now
4076 break;
4077 }
4078 }
4079 }
4080 }
4081 }
4082
4083 // Save the scratch_class as the previous version if any of the methods are running.
4084 // The previous_versions are used to set breakpoints in EMCP methods and they are
4085 // also used to clean MethodData links to redefined methods that are no longer running.
4086 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class,
4087 int emcp_method_count) {
4088 assert(Thread::current()->is_VM_thread(),
4089 "only VMThread can add previous versions");
4090
4091 ResourceMark rm;
4092 log_trace(redefine, class, iklass, add)
4093 ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count);
4094
4095 // Clean out old previous versions for this class
4096 purge_previous_version_list();
4097
4098 // Mark newly obsolete methods in remaining previous versions. An EMCP method from
4099 // a previous redefinition may be made obsolete by this redefinition.
4100 Array<Method*>* old_methods = scratch_class->methods();
4101 mark_newly_obsolete_methods(old_methods, emcp_method_count);
4102
4103 // If the constant pool for this previous version of the class
4104 // is not marked as being on the stack, then none of the methods
4105 // in this previous version of the class are on the stack so
4106 // we don't need to add this as a previous version.
4107 ConstantPool* cp_ref = scratch_class->constants();
4108 if (!cp_ref->on_stack()) {
4109 log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running");
4110 // For debugging purposes.
4111 scratch_class->set_is_scratch_class();
4112 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class);
4113 return;
4114 }
4115
4116 if (emcp_method_count != 0) {
4117 // At least one method is still running, check for EMCP methods
4118 for (int i = 0; i < old_methods->length(); i++) {
4119 Method* old_method = old_methods->at(i);
4120 if (!old_method->is_obsolete() && old_method->on_stack()) {
4121 // if EMCP method (not obsolete) is on the stack, mark as EMCP so that
4122 // we can add breakpoints for it.
4123
4124 // We set the method->on_stack bit during safepoints for class redefinition
4125 // and use this bit to set the is_running_emcp bit.
4126 // After the safepoint, the on_stack bit is cleared and the running emcp
4127 // method may exit. If so, we would set a breakpoint in a method that
4128 // is never reached, but this won't be noticeable to the programmer.
4129 old_method->set_running_emcp(true);
4130 log_trace(redefine, class, iklass, add)
4131 ("EMCP method %s is on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
4132 } else if (!old_method->is_obsolete()) {
4133 log_trace(redefine, class, iklass, add)
4134 ("EMCP method %s is NOT on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
4135 }
4136 }
4137 }
4138
4139 // Add previous version if any methods are still running.
4140 // Set has_previous_version flag for processing during class unloading.
4141 _has_previous_versions = true;
4142 log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack.");
4143 assert(scratch_class->previous_versions() == NULL, "shouldn't have a previous version");
4144 scratch_class->link_previous_versions(previous_versions());
4145 link_previous_versions(scratch_class);
4146 } // end add_previous_version()
4147
4148 #endif // INCLUDE_JVMTI
4149
4150 Method* InstanceKlass::method_with_idnum(int idnum) {
4151 Method* m = NULL;
4152 if (idnum < methods()->length()) {
4153 m = methods()->at(idnum);
4154 }
4155 if (m == NULL || m->method_idnum() != idnum) {
4156 for (int index = 0; index < methods()->length(); ++index) {
4157 m = methods()->at(index);
4158 if (m->method_idnum() == idnum) {
4159 return m;
4160 }
4161 }
4162 // None found, return null for the caller to handle.
4163 return NULL;
4164 }
4165 return m;
4166 }
4167
4168
4169 Method* InstanceKlass::method_with_orig_idnum(int idnum) {
4170 if (idnum >= methods()->length()) {
4171 return NULL;
4172 }
4173 Method* m = methods()->at(idnum);
4174 if (m != NULL && m->orig_method_idnum() == idnum) {
4175 return m;
4176 }
4177 // Obsolete method idnum does not match the original idnum
4178 for (int index = 0; index < methods()->length(); ++index) {
4179 m = methods()->at(index);
4180 if (m->orig_method_idnum() == idnum) {
4181 return m;
4182 }
4183 }
4184 // None found, return null for the caller to handle.
4185 return NULL;
4186 }
4187
4188
4189 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) {
4190 InstanceKlass* holder = get_klass_version(version);
4191 if (holder == NULL) {
4192 return NULL; // The version of klass is gone, no method is found
4193 }
4194 Method* method = holder->method_with_orig_idnum(idnum);
4195 return method;
4196 }
4197
4198 #if INCLUDE_JVMTI
4199 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() {
4200 return _cached_class_file;
4201 }
4202
4203 jint InstanceKlass::get_cached_class_file_len() {
4204 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
4205 }
4206
4207 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
4208 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
4209 }
4210 #endif
4211
4212 #define THROW_DVT_ERROR(s) \
4213 Exceptions::fthrow(THREAD_AND_LOCATION, vmSymbols::java_lang_IncompatibleClassChangeError(), \
4214 "ValueCapableClass class '%s' %s", external_name(),(s)); \
4215 return