1 /*
2 * Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "aot/aotLoader.hpp"
28 #include "classfile/classFileParser.hpp"
29 #include "classfile/classFileStream.hpp"
30 #include "classfile/classLoader.hpp"
31 #include "classfile/classLoaderData.inline.hpp"
32 #include "classfile/javaClasses.hpp"
33 #include "classfile/moduleEntry.hpp"
34 #include "classfile/resolutionErrors.hpp"
35 #include "classfile/symbolTable.hpp"
36 #include "classfile/systemDictionary.hpp"
37 #include "classfile/systemDictionaryShared.hpp"
38 #include "classfile/verifier.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "code/dependencyContext.hpp"
41 #include "compiler/compileBroker.hpp"
42 #include "gc/shared/collectedHeap.inline.hpp"
43 #include "interpreter/oopMapCache.hpp"
44 #include "interpreter/rewriter.hpp"
45 #include "jvmtifiles/jvmti.h"
46 #include "logging/log.hpp"
47 #include "logging/logMessage.hpp"
48 #include "logging/logStream.hpp"
49 #include "memory/allocation.inline.hpp"
50 #include "memory/iterator.inline.hpp"
51 #include "memory/metadataFactory.hpp"
52 #include "memory/metaspaceClosure.hpp"
53 #include "memory/metaspaceShared.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/resourceArea.hpp"
56 #include "memory/universe.hpp"
57 #include "oops/fieldStreams.inline.hpp"
58 #include "oops/constantPool.hpp"
59 #include "oops/instanceClassLoaderKlass.hpp"
60 #include "oops/instanceKlass.inline.hpp"
61 #include "oops/instanceMirrorKlass.hpp"
62 #include "oops/instanceOop.hpp"
63 #include "oops/klass.inline.hpp"
64 #include "oops/method.hpp"
65 #include "oops/oop.inline.hpp"
66 #include "oops/recordComponent.hpp"
67 #include "oops/symbol.hpp"
68 #include "prims/jvmtiExport.hpp"
69 #include "prims/jvmtiRedefineClasses.hpp"
70 #include "prims/jvmtiThreadState.hpp"
71 #include "prims/methodComparator.hpp"
72 #include "runtime/atomic.hpp"
73 #include "runtime/biasedLocking.hpp"
74 #include "runtime/fieldDescriptor.inline.hpp"
75 #include "runtime/handles.inline.hpp"
76 #include "runtime/javaCalls.hpp"
77 #include "runtime/mutexLocker.hpp"
78 #include "runtime/orderAccess.hpp"
79 #include "runtime/thread.inline.hpp"
80 #include "services/classLoadingService.hpp"
81 #include "services/threadService.hpp"
82 #include "utilities/dtrace.hpp"
83 #include "utilities/events.hpp"
84 #include "utilities/macros.hpp"
85 #include "utilities/stringUtils.hpp"
86 #ifdef COMPILER1
87 #include "c1/c1_Compiler.hpp"
88 #endif
89 #if INCLUDE_JFR
90 #include "jfr/jfrEvents.hpp"
91 #endif
92
93
94 #ifdef DTRACE_ENABLED
95
96
97 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED
98 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE
99 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT
100 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS
101 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED
102 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT
103 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR
104 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END
105 #define DTRACE_CLASSINIT_PROBE(type, thread_type) \
106 { \
107 char* data = NULL; \
108 int len = 0; \
109 Symbol* clss_name = name(); \
110 if (clss_name != NULL) { \
111 data = (char*)clss_name->bytes(); \
112 len = clss_name->utf8_length(); \
113 } \
114 HOTSPOT_CLASS_INITIALIZATION_##type( \
115 data, len, (void*)class_loader(), thread_type); \
116 }
117
118 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) \
119 { \
120 char* data = NULL; \
121 int len = 0; \
122 Symbol* clss_name = name(); \
123 if (clss_name != NULL) { \
124 data = (char*)clss_name->bytes(); \
125 len = clss_name->utf8_length(); \
126 } \
127 HOTSPOT_CLASS_INITIALIZATION_##type( \
128 data, len, (void*)class_loader(), thread_type, wait); \
129 }
130
131 #else // ndef DTRACE_ENABLED
132
133 #define DTRACE_CLASSINIT_PROBE(type, thread_type)
134 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait)
135
136 #endif // ndef DTRACE_ENABLED
137
138
139 static inline bool is_class_loader(const Symbol* class_name,
140 const ClassFileParser& parser) {
141 assert(class_name != NULL, "invariant");
142
143 if (class_name == vmSymbols::java_lang_ClassLoader()) {
144 return true;
145 }
146
147 if (SystemDictionary::ClassLoader_klass_loaded()) {
148 const Klass* const super_klass = parser.super_klass();
149 if (super_klass != NULL) {
150 if (super_klass->is_subtype_of(SystemDictionary::ClassLoader_klass())) {
151 return true;
152 }
153 }
154 }
155 return false;
156 }
157
158 // private: called to verify that k is a static member of this nest.
159 // We know that k is an instance class in the same package and hence the
160 // same classloader.
161 bool InstanceKlass::has_nest_member(InstanceKlass* k, TRAPS) const {
162 assert(!is_hidden(), "unexpected hidden class");
163 if (_nest_members == NULL || _nest_members == Universe::the_empty_short_array()) {
164 if (log_is_enabled(Trace, class, nestmates)) {
165 ResourceMark rm(THREAD);
166 log_trace(class, nestmates)("Checked nest membership of %s in non-nest-host class %s",
167 k->external_name(), this->external_name());
168 }
169 return false;
170 }
171
172 if (log_is_enabled(Trace, class, nestmates)) {
173 ResourceMark rm(THREAD);
174 log_trace(class, nestmates)("Checking nest membership of %s in %s",
175 k->external_name(), this->external_name());
176 }
177
178 // Check for a resolved cp entry , else fall back to a name check.
179 // We don't want to resolve any class other than the one being checked.
180 for (int i = 0; i < _nest_members->length(); i++) {
181 int cp_index = _nest_members->at(i);
182 if (_constants->tag_at(cp_index).is_klass()) {
183 Klass* k2 = _constants->klass_at(cp_index, THREAD);
184 assert(!HAS_PENDING_EXCEPTION || PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass()),
185 "Exceptions should not be possible here");
186 if (k2 == k) {
187 log_trace(class, nestmates)("- class is listed at nest_members[%d] => cp[%d]", i, cp_index);
188 return true;
189 }
190 }
191 else {
192 Symbol* name = _constants->klass_name_at(cp_index);
193 if (name == k->name()) {
194 log_trace(class, nestmates)("- Found it at nest_members[%d] => cp[%d]", i, cp_index);
195
196 // Names match so check actual klass. This may trigger class loading if
197 // it doesn't match though that should be impossible as it means one classloader
198 // has defined two different classes with the same name! A compiler thread won't be
199 // able to perform that loading but we can't exclude the compiler threads from
200 // executing this logic. But it should actually be impossible to trigger loading here.
201 Klass* k2 = _constants->klass_at(cp_index, THREAD);
202 assert(!HAS_PENDING_EXCEPTION || PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass()),
203 "Exceptions should not be possible here");
204 if (k2 == k) {
205 log_trace(class, nestmates)("- class is listed as a nest member");
206 return true;
207 }
208 else {
209 // same name but different klass!
210 log_trace(class, nestmates)(" - klass comparison failed!");
211 // can't have two names the same, so we're done
212 return false;
213 }
214 }
215 }
216 }
217 log_trace(class, nestmates)("- class is NOT a nest member!");
218 return false;
219 }
220
221 // Called to verify that k is a permitted subclass of this class
222 bool InstanceKlass::has_as_permitted_subclass(const InstanceKlass* k) const {
223 Thread* THREAD = Thread::current();
224 assert(k != NULL, "sanity check");
225 assert(_permitted_subclasses != NULL && _permitted_subclasses != Universe::the_empty_short_array(),
226 "unexpected empty _permitted_subclasses array");
227
228 if (log_is_enabled(Trace, class, sealed)) {
229 ResourceMark rm(THREAD);
230 log_trace(class, sealed)("Checking for permitted subclass of %s in %s",
231 k->external_name(), this->external_name());
232 }
233
234 // Check that the class and its super are in the same module.
235 if (k->module() != this->module()) {
236 ResourceMark rm(THREAD);
237 log_trace(class, sealed)("Check failed for same module of permitted subclass %s and sealed class %s",
238 k->external_name(), this->external_name());
239 return false;
240 }
241
242 if (!k->is_public() && !is_same_class_package(k)) {
243 ResourceMark rm(THREAD);
244 log_trace(class, sealed)("Check failed, subclass %s not public and not in the same package as sealed class %s",
245 k->external_name(), this->external_name());
246 return false;
247 }
248
249 // Check for a resolved cp entry, else fall back to a name check.
250 // We don't want to resolve any class other than the one being checked.
251 for (int i = 0; i < _permitted_subclasses->length(); i++) {
252 int cp_index = _permitted_subclasses->at(i);
253 if (_constants->tag_at(cp_index).is_klass()) {
254 Klass* k2 = _constants->klass_at(cp_index, THREAD);
255 assert(!HAS_PENDING_EXCEPTION, "Unexpected exception");
256 if (k2 == k) {
257 log_trace(class, sealed)("- class is listed at permitted_subclasses[%d] => cp[%d]", i, cp_index);
258 return true;
259 }
260 } else {
261 Symbol* name = _constants->klass_name_at(cp_index);
262 if (name == k->name()) {
263 log_trace(class, sealed)("- Found it at permitted_subclasses[%d] => cp[%d]", i, cp_index);
264 return true;
265 }
266 }
267 }
268 log_trace(class, sealed)("- class is NOT a permitted subclass!");
269 return false;
270 }
271
272 // Return nest-host class, resolving, validating and saving it if needed.
273 // In cases where this is called from a thread that cannot do classloading
274 // (such as a native JIT thread) then we simply return NULL, which in turn
275 // causes the access check to return false. Such code will retry the access
276 // from a more suitable environment later. Otherwise the _nest_host is always
277 // set once this method returns.
278 // Any errors from nest-host resolution must be preserved so they can be queried
279 // from higher-level access checking code, and reported as part of access checking
280 // exceptions.
281 // VirtualMachineErrors are propagated with a NULL return.
282 // Under any conditions where the _nest_host can be set to non-NULL the resulting
283 // value of it and, if applicable, the nest host resolution/validation error,
284 // are idempotent.
285 InstanceKlass* InstanceKlass::nest_host(TRAPS) {
286 InstanceKlass* nest_host_k = _nest_host;
287 if (nest_host_k != NULL) {
288 return nest_host_k;
289 }
290
291 ResourceMark rm(THREAD);
292
293 // need to resolve and save our nest-host class.
294 if (_nest_host_index != 0) { // we have a real nest_host
295 // Before trying to resolve check if we're in a suitable context
296 if (!THREAD->can_call_java() && !_constants->tag_at(_nest_host_index).is_klass()) {
297 log_trace(class, nestmates)("Rejected resolution of nest-host of %s in unsuitable thread",
298 this->external_name());
299 return NULL; // sentinel to say "try again from a different context"
300 }
301
302 log_trace(class, nestmates)("Resolving nest-host of %s using cp entry for %s",
303 this->external_name(),
304 _constants->klass_name_at(_nest_host_index)->as_C_string());
305
306 Klass* k = _constants->klass_at(_nest_host_index, THREAD);
307 if (HAS_PENDING_EXCEPTION) {
308 if (PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass())) {
309 return NULL; // propagate VMEs
310 }
311 stringStream ss;
312 char* target_host_class = _constants->klass_name_at(_nest_host_index)->as_C_string();
313 ss.print("Nest host resolution of %s with host %s failed: ",
314 this->external_name(), target_host_class);
315 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
316 const char* msg = ss.as_string(true /* on C-heap */);
317 constantPoolHandle cph(THREAD, constants());
318 SystemDictionary::add_nest_host_error(cph, _nest_host_index, msg);
319 CLEAR_PENDING_EXCEPTION;
320
321 log_trace(class, nestmates)("%s", msg);
322 } else {
323 // A valid nest-host is an instance class in the current package that lists this
324 // class as a nest member. If any of these conditions are not met the class is
325 // its own nest-host.
326 const char* error = NULL;
327
328 // JVMS 5.4.4 indicates package check comes first
329 if (is_same_class_package(k)) {
330 // Now check actual membership. We can't be a member if our "host" is
331 // not an instance class.
332 if (k->is_instance_klass()) {
333 nest_host_k = InstanceKlass::cast(k);
334 bool is_member = nest_host_k->has_nest_member(this, THREAD);
335 // exception is rare, perhaps impossible
336 if (!HAS_PENDING_EXCEPTION) {
337 if (is_member) {
338 _nest_host = nest_host_k; // save resolved nest-host value
339
340 log_trace(class, nestmates)("Resolved nest-host of %s to %s",
341 this->external_name(), k->external_name());
342 return nest_host_k;
343 } else {
344 error = "current type is not listed as a nest member";
345 }
346 } else {
347 if (PENDING_EXCEPTION->is_a(SystemDictionary::VirtualMachineError_klass())) {
348 return NULL; // propagate VMEs
349 }
350 stringStream ss;
351 ss.print("exception on member check: ");
352 java_lang_Throwable::print(PENDING_EXCEPTION, &ss);
353 error = ss.as_string();
354 }
355 } else {
356 error = "host is not an instance class";
357 }
358 } else {
359 error = "types are in different packages";
360 }
361
362 // something went wrong, so record what and log it
363 {
364 stringStream ss;
365 ss.print("Type %s (loader: %s) is not a nest member of type %s (loader: %s): %s",
366 this->external_name(),
367 this->class_loader_data()->loader_name_and_id(),
368 k->external_name(),
369 k->class_loader_data()->loader_name_and_id(),
370 error);
371 const char* msg = ss.as_string(true /* on C-heap */);
372 constantPoolHandle cph(THREAD, constants());
373 SystemDictionary::add_nest_host_error(cph, _nest_host_index, msg);
374 log_trace(class, nestmates)("%s", msg);
375 }
376 }
377 } else {
378 log_trace(class, nestmates)("Type %s is not part of a nest: setting nest-host to self",
379 this->external_name());
380 }
381
382 // Either not in an explicit nest, or else an error occurred, so
383 // the nest-host is set to `this`. Any thread that sees this assignment
384 // will also see any setting of nest_host_error(), if applicable.
385 return (_nest_host = this);
386 }
387
388 // Dynamic nest member support: set this class's nest host to the given class.
389 // This occurs as part of the class definition, as soon as the instanceKlass
390 // has been created and doesn't require further resolution. The code:
391 // lookup().defineHiddenClass(bytes_for_X, NESTMATE);
392 // results in:
393 // class_of_X.set_nest_host(lookup().lookupClass().getNestHost())
394 // If it has an explicit _nest_host_index or _nest_members, these will be ignored.
395 // We also know the "host" is a valid nest-host in the same package so we can
396 // assert some of those facts.
397 void InstanceKlass::set_nest_host(InstanceKlass* host, TRAPS) {
398 assert(is_hidden(), "must be a hidden class");
399 assert(host != NULL, "NULL nest host specified");
400 assert(_nest_host == NULL, "current class has resolved nest-host");
401 assert(nest_host_error(THREAD) == NULL, "unexpected nest host resolution error exists: %s",
402 nest_host_error(THREAD));
403 assert((host->_nest_host == NULL && host->_nest_host_index == 0) ||
404 (host->_nest_host == host), "proposed host is not a valid nest-host");
405 // Can't assert this as package is not set yet:
406 // assert(is_same_class_package(host), "proposed host is in wrong package");
407
408 if (log_is_enabled(Trace, class, nestmates)) {
409 ResourceMark rm(THREAD);
410 const char* msg = "";
411 // a hidden class does not expect a statically defined nest-host
412 if (_nest_host_index > 0) {
413 msg = "(the NestHost attribute in the current class is ignored)";
414 } else if (_nest_members != NULL && _nest_members != Universe::the_empty_short_array()) {
415 msg = "(the NestMembers attribute in the current class is ignored)";
416 }
417 log_trace(class, nestmates)("Injected type %s into the nest of %s %s",
418 this->external_name(),
419 host->external_name(),
420 msg);
421 }
422 // set dynamic nest host
423 _nest_host = host;
424 // Record dependency to keep nest host from being unloaded before this class.
425 ClassLoaderData* this_key = class_loader_data();
426 this_key->record_dependency(host);
427 }
428
429 // check if 'this' and k are nestmates (same nest_host), or k is our nest_host,
430 // or we are k's nest_host - all of which is covered by comparing the two
431 // resolved_nest_hosts.
432 // Any exceptions (i.e. VMEs) are propagated.
433 bool InstanceKlass::has_nestmate_access_to(InstanceKlass* k, TRAPS) {
434
435 assert(this != k, "this should be handled by higher-level code");
436
437 // Per JVMS 5.4.4 we first resolve and validate the current class, then
438 // the target class k.
439
440 InstanceKlass* cur_host = nest_host(CHECK_false);
441 if (cur_host == NULL) {
442 return false;
443 }
444
445 Klass* k_nest_host = k->nest_host(CHECK_false);
446 if (k_nest_host == NULL) {
447 return false;
448 }
449
450 bool access = (cur_host == k_nest_host);
451
452 ResourceMark rm(THREAD);
453 log_trace(class, nestmates)("Class %s does %shave nestmate access to %s",
454 this->external_name(),
455 access ? "" : "NOT ",
456 k->external_name());
457 return access;
458 }
459
460 const char* InstanceKlass::nest_host_error(TRAPS) {
461 if (_nest_host_index == 0) {
462 return NULL;
463 } else {
464 constantPoolHandle cph(THREAD, constants());
465 return SystemDictionary::find_nest_host_error(cph, (int)_nest_host_index);
466 }
467 }
468
469 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) {
470 bool is_hidden_or_anonymous = parser.is_hidden() || parser.is_unsafe_anonymous();
471 const int size = InstanceKlass::size(parser.vtable_size(),
472 parser.itable_size(),
473 nonstatic_oop_map_size(parser.total_oop_map_count()),
474 parser.is_interface(),
475 parser.is_unsafe_anonymous(),
476 should_store_fingerprint(is_hidden_or_anonymous));
477
478 const Symbol* const class_name = parser.class_name();
479 assert(class_name != NULL, "invariant");
480 ClassLoaderData* loader_data = parser.loader_data();
481 assert(loader_data != NULL, "invariant");
482
483 InstanceKlass* ik;
484
485 // Allocation
486 if (REF_NONE == parser.reference_type()) {
487 if (class_name == vmSymbols::java_lang_Class()) {
488 // mirror
489 ik = new (loader_data, size, THREAD) InstanceMirrorKlass(parser);
490 }
491 else if (is_class_loader(class_name, parser)) {
492 // class loader
493 ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser);
494 } else {
495 // normal
496 ik = new (loader_data, size, THREAD) InstanceKlass(parser, InstanceKlass::_kind_other);
497 }
498 } else {
499 // reference
500 ik = new (loader_data, size, THREAD) InstanceRefKlass(parser);
501 }
502
503 // Check for pending exception before adding to the loader data and incrementing
504 // class count. Can get OOM here.
505 if (HAS_PENDING_EXCEPTION) {
506 return NULL;
507 }
508
509 return ik;
510 }
511
512
513 // copy method ordering from resource area to Metaspace
514 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) {
515 if (m != NULL) {
516 // allocate a new array and copy contents (memcpy?)
517 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
518 for (int i = 0; i < m->length(); i++) {
519 _method_ordering->at_put(i, m->at(i));
520 }
521 } else {
522 _method_ordering = Universe::the_empty_int_array();
523 }
524 }
525
526 // create a new array of vtable_indices for default methods
527 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
528 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
529 assert(default_vtable_indices() == NULL, "only create once");
530 set_default_vtable_indices(vtable_indices);
531 return vtable_indices;
532 }
533
534 InstanceKlass::InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id) :
535 Klass(id),
536 _nest_members(NULL),
537 _nest_host(NULL),
538 _permitted_subclasses(NULL),
539 _record_components(NULL),
540 _static_field_size(parser.static_field_size()),
541 _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())),
542 _itable_len(parser.itable_size()),
543 _nest_host_index(0),
544 _init_state(allocated),
545 _reference_type(parser.reference_type()),
546 _init_thread(NULL)
547 {
548 set_vtable_length(parser.vtable_size());
549 set_kind(kind);
550 set_access_flags(parser.access_flags());
551 if (parser.is_hidden()) set_is_hidden();
552 set_is_unsafe_anonymous(parser.is_unsafe_anonymous());
553 set_layout_helper(Klass::instance_layout_helper(parser.layout_size(),
554 false));
555
556 assert(NULL == _methods, "underlying memory not zeroed?");
557 assert(is_instance_klass(), "is layout incorrect?");
558 assert(size_helper() == parser.layout_size(), "incorrect size_helper?");
559
560 // Set biased locking bit for all instances of this class; it will be
561 // cleared if revocation occurs too often for this type
562 if (UseBiasedLocking && BiasedLocking::enabled()) {
563 set_prototype_header(markWord::biased_locking_prototype());
564 }
565 }
566
567 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
568 Array<Method*>* methods) {
569 if (methods != NULL && methods != Universe::the_empty_method_array() &&
570 !methods->is_shared()) {
571 for (int i = 0; i < methods->length(); i++) {
572 Method* method = methods->at(i);
573 if (method == NULL) continue; // maybe null if error processing
574 // Only want to delete methods that are not executing for RedefineClasses.
575 // The previous version will point to them so they're not totally dangling
576 assert (!method->on_stack(), "shouldn't be called with methods on stack");
577 MetadataFactory::free_metadata(loader_data, method);
578 }
579 MetadataFactory::free_array<Method*>(loader_data, methods);
580 }
581 }
582
583 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
584 const Klass* super_klass,
585 Array<InstanceKlass*>* local_interfaces,
586 Array<InstanceKlass*>* transitive_interfaces) {
587 // Only deallocate transitive interfaces if not empty, same as super class
588 // or same as local interfaces. See code in parseClassFile.
589 Array<InstanceKlass*>* ti = transitive_interfaces;
590 if (ti != Universe::the_empty_instance_klass_array() && ti != local_interfaces) {
591 // check that the interfaces don't come from super class
592 Array<InstanceKlass*>* sti = (super_klass == NULL) ? NULL :
593 InstanceKlass::cast(super_klass)->transitive_interfaces();
594 if (ti != sti && ti != NULL && !ti->is_shared()) {
595 MetadataFactory::free_array<InstanceKlass*>(loader_data, ti);
596 }
597 }
598
599 // local interfaces can be empty
600 if (local_interfaces != Universe::the_empty_instance_klass_array() &&
601 local_interfaces != NULL && !local_interfaces->is_shared()) {
602 MetadataFactory::free_array<InstanceKlass*>(loader_data, local_interfaces);
603 }
604 }
605
606 void InstanceKlass::deallocate_record_components(ClassLoaderData* loader_data,
607 Array<RecordComponent*>* record_components) {
608 if (record_components != NULL && !record_components->is_shared()) {
609 for (int i = 0; i < record_components->length(); i++) {
610 RecordComponent* record_component = record_components->at(i);
611 MetadataFactory::free_metadata(loader_data, record_component);
612 }
613 MetadataFactory::free_array<RecordComponent*>(loader_data, record_components);
614 }
615 }
616
617 // This function deallocates the metadata and C heap pointers that the
618 // InstanceKlass points to.
619 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
620
621 // Orphan the mirror first, CMS thinks it's still live.
622 if (java_mirror() != NULL) {
623 java_lang_Class::set_klass(java_mirror(), NULL);
624 }
625
626 // Also remove mirror from handles
627 loader_data->remove_handle(_java_mirror);
628
629 // Need to take this class off the class loader data list.
630 loader_data->remove_class(this);
631
632 // The array_klass for this class is created later, after error handling.
633 // For class redefinition, we keep the original class so this scratch class
634 // doesn't have an array class. Either way, assert that there is nothing
635 // to deallocate.
636 assert(array_klasses() == NULL, "array classes shouldn't be created for this class yet");
637
638 // Release C heap allocated data that this points to, which includes
639 // reference counting symbol names.
640 release_C_heap_structures_internal();
641
642 deallocate_methods(loader_data, methods());
643 set_methods(NULL);
644
645 deallocate_record_components(loader_data, record_components());
646 set_record_components(NULL);
647
648 if (method_ordering() != NULL &&
649 method_ordering() != Universe::the_empty_int_array() &&
650 !method_ordering()->is_shared()) {
651 MetadataFactory::free_array<int>(loader_data, method_ordering());
652 }
653 set_method_ordering(NULL);
654
655 // default methods can be empty
656 if (default_methods() != NULL &&
657 default_methods() != Universe::the_empty_method_array() &&
658 !default_methods()->is_shared()) {
659 MetadataFactory::free_array<Method*>(loader_data, default_methods());
660 }
661 // Do NOT deallocate the default methods, they are owned by superinterfaces.
662 set_default_methods(NULL);
663
664 // default methods vtable indices can be empty
665 if (default_vtable_indices() != NULL &&
666 !default_vtable_indices()->is_shared()) {
667 MetadataFactory::free_array<int>(loader_data, default_vtable_indices());
668 }
669 set_default_vtable_indices(NULL);
670
671
672 // This array is in Klass, but remove it with the InstanceKlass since
673 // this place would be the only caller and it can share memory with transitive
674 // interfaces.
675 if (secondary_supers() != NULL &&
676 secondary_supers() != Universe::the_empty_klass_array() &&
677 // see comments in compute_secondary_supers about the following cast
678 (address)(secondary_supers()) != (address)(transitive_interfaces()) &&
679 !secondary_supers()->is_shared()) {
680 MetadataFactory::free_array<Klass*>(loader_data, secondary_supers());
681 }
682 set_secondary_supers(NULL);
683
684 deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces());
685 set_transitive_interfaces(NULL);
686 set_local_interfaces(NULL);
687
688 if (fields() != NULL && !fields()->is_shared()) {
689 MetadataFactory::free_array<jushort>(loader_data, fields());
690 }
691 set_fields(NULL, 0);
692
693 // If a method from a redefined class is using this constant pool, don't
694 // delete it, yet. The new class's previous version will point to this.
695 if (constants() != NULL) {
696 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack");
697 if (!constants()->is_shared()) {
698 MetadataFactory::free_metadata(loader_data, constants());
699 }
700 // Delete any cached resolution errors for the constant pool
701 SystemDictionary::delete_resolution_error(constants());
702
703 set_constants(NULL);
704 }
705
706 if (inner_classes() != NULL &&
707 inner_classes() != Universe::the_empty_short_array() &&
708 !inner_classes()->is_shared()) {
709 MetadataFactory::free_array<jushort>(loader_data, inner_classes());
710 }
711 set_inner_classes(NULL);
712
713 if (nest_members() != NULL &&
714 nest_members() != Universe::the_empty_short_array() &&
715 !nest_members()->is_shared()) {
716 MetadataFactory::free_array<jushort>(loader_data, nest_members());
717 }
718 set_nest_members(NULL);
719
720 if (permitted_subclasses() != NULL &&
721 permitted_subclasses() != Universe::the_empty_short_array() &&
722 !permitted_subclasses()->is_shared()) {
723 MetadataFactory::free_array<jushort>(loader_data, permitted_subclasses());
724 }
725 set_permitted_subclasses(NULL);
726
727 // We should deallocate the Annotations instance if it's not in shared spaces.
728 if (annotations() != NULL && !annotations()->is_shared()) {
729 MetadataFactory::free_metadata(loader_data, annotations());
730 }
731 set_annotations(NULL);
732
733 if (Arguments::is_dumping_archive()) {
734 SystemDictionaryShared::remove_dumptime_info(this);
735 }
736 }
737
738 bool InstanceKlass::is_sealed() const {
739 return _permitted_subclasses != NULL &&
740 _permitted_subclasses != Universe::the_empty_short_array() &&
741 _permitted_subclasses->length() > 0;
742 }
743
744 bool InstanceKlass::should_be_initialized() const {
745 return !is_initialized();
746 }
747
748 klassItable InstanceKlass::itable() const {
749 return klassItable(const_cast<InstanceKlass*>(this));
750 }
751
752 void InstanceKlass::eager_initialize(Thread *thread) {
753 if (!EagerInitialization) return;
754
755 if (this->is_not_initialized()) {
756 // abort if the the class has a class initializer
757 if (this->class_initializer() != NULL) return;
758
759 // abort if it is java.lang.Object (initialization is handled in genesis)
760 Klass* super_klass = super();
761 if (super_klass == NULL) return;
762
763 // abort if the super class should be initialized
764 if (!InstanceKlass::cast(super_klass)->is_initialized()) return;
765
766 // call body to expose the this pointer
767 eager_initialize_impl();
768 }
769 }
770
771 // JVMTI spec thinks there are signers and protection domain in the
772 // instanceKlass. These accessors pretend these fields are there.
773 // The hprof specification also thinks these fields are in InstanceKlass.
774 oop InstanceKlass::protection_domain() const {
775 // return the protection_domain from the mirror
776 return java_lang_Class::protection_domain(java_mirror());
777 }
778
779 // To remove these from requires an incompatible change and CCC request.
780 objArrayOop InstanceKlass::signers() const {
781 // return the signers from the mirror
782 return java_lang_Class::signers(java_mirror());
783 }
784
785 oop InstanceKlass::init_lock() const {
786 // return the init lock from the mirror
787 oop lock = java_lang_Class::init_lock(java_mirror());
788 // Prevent reordering with any access of initialization state
789 OrderAccess::loadload();
790 assert((oop)lock != NULL || !is_not_initialized(), // initialized or in_error state
791 "only fully initialized state can have a null lock");
792 return lock;
793 }
794
795 // Set the initialization lock to null so the object can be GC'ed. Any racing
796 // threads to get this lock will see a null lock and will not lock.
797 // That's okay because they all check for initialized state after getting
798 // the lock and return.
799 void InstanceKlass::fence_and_clear_init_lock() {
800 // make sure previous stores are all done, notably the init_state.
801 OrderAccess::storestore();
802 java_lang_Class::clear_init_lock(java_mirror());
803 assert(!is_not_initialized(), "class must be initialized now");
804 }
805
806 void InstanceKlass::eager_initialize_impl() {
807 EXCEPTION_MARK;
808 HandleMark hm(THREAD);
809 Handle h_init_lock(THREAD, init_lock());
810 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
811
812 // abort if someone beat us to the initialization
813 if (!is_not_initialized()) return; // note: not equivalent to is_initialized()
814
815 ClassState old_state = init_state();
816 link_class_impl(THREAD);
817 if (HAS_PENDING_EXCEPTION) {
818 CLEAR_PENDING_EXCEPTION;
819 // Abort if linking the class throws an exception.
820
821 // Use a test to avoid redundantly resetting the state if there's
822 // no change. Set_init_state() asserts that state changes make
823 // progress, whereas here we might just be spinning in place.
824 if (old_state != _init_state)
825 set_init_state(old_state);
826 } else {
827 // linking successfull, mark class as initialized
828 set_init_state(fully_initialized);
829 fence_and_clear_init_lock();
830 // trace
831 if (log_is_enabled(Info, class, init)) {
832 ResourceMark rm(THREAD);
833 log_info(class, init)("[Initialized %s without side effects]", external_name());
834 }
835 }
836 }
837
838
839 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization
840 // process. The step comments refers to the procedure described in that section.
841 // Note: implementation moved to static method to expose the this pointer.
842 void InstanceKlass::initialize(TRAPS) {
843 if (this->should_be_initialized()) {
844 initialize_impl(CHECK);
845 // Note: at this point the class may be initialized
846 // OR it may be in the state of being initialized
847 // in case of recursive initialization!
848 } else {
849 assert(is_initialized(), "sanity check");
850 }
851 }
852
853
854 bool InstanceKlass::verify_code(TRAPS) {
855 // 1) Verify the bytecodes
856 return Verifier::verify(this, should_verify_class(), THREAD);
857 }
858
859 void InstanceKlass::link_class(TRAPS) {
860 assert(is_loaded(), "must be loaded");
861 if (!is_linked()) {
862 link_class_impl(CHECK);
863 }
864 }
865
866 // Called to verify that a class can link during initialization, without
867 // throwing a VerifyError.
868 bool InstanceKlass::link_class_or_fail(TRAPS) {
869 assert(is_loaded(), "must be loaded");
870 if (!is_linked()) {
871 link_class_impl(CHECK_false);
872 }
873 return is_linked();
874 }
875
876 bool InstanceKlass::link_class_impl(TRAPS) {
877 if (DumpSharedSpaces && SystemDictionaryShared::has_class_failed_verification(this)) {
878 // This is for CDS dumping phase only -- we use the in_error_state to indicate that
879 // the class has failed verification. Throwing the NoClassDefFoundError here is just
880 // a convenient way to stop repeat attempts to verify the same (bad) class.
881 //
882 // Note that the NoClassDefFoundError is not part of the JLS, and should not be thrown
883 // if we are executing Java code. This is not a problem for CDS dumping phase since
884 // it doesn't execute any Java code.
885 ResourceMark rm(THREAD);
886 Exceptions::fthrow(THREAD_AND_LOCATION,
887 vmSymbols::java_lang_NoClassDefFoundError(),
888 "Class %s, or one of its supertypes, failed class initialization",
889 external_name());
890 return false;
891 }
892 // return if already verified
893 if (is_linked()) {
894 return true;
895 }
896
897 // Timing
898 // timer handles recursion
899 assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl");
900 JavaThread* jt = (JavaThread*)THREAD;
901
902 // link super class before linking this class
903 Klass* super_klass = super();
904 if (super_klass != NULL) {
905 if (super_klass->is_interface()) { // check if super class is an interface
906 ResourceMark rm(THREAD);
907 Exceptions::fthrow(
908 THREAD_AND_LOCATION,
909 vmSymbols::java_lang_IncompatibleClassChangeError(),
910 "class %s has interface %s as super class",
911 external_name(),
912 super_klass->external_name()
913 );
914 return false;
915 }
916
917 InstanceKlass* ik_super = InstanceKlass::cast(super_klass);
918 ik_super->link_class_impl(CHECK_false);
919 }
920
921 // link all interfaces implemented by this class before linking this class
922 Array<InstanceKlass*>* interfaces = local_interfaces();
923 int num_interfaces = interfaces->length();
924 for (int index = 0; index < num_interfaces; index++) {
925 InstanceKlass* interk = interfaces->at(index);
926 interk->link_class_impl(CHECK_false);
927 }
928
929 // in case the class is linked in the process of linking its superclasses
930 if (is_linked()) {
931 return true;
932 }
933
934 // trace only the link time for this klass that includes
935 // the verification time
936 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
937 ClassLoader::perf_class_link_selftime(),
938 ClassLoader::perf_classes_linked(),
939 jt->get_thread_stat()->perf_recursion_counts_addr(),
940 jt->get_thread_stat()->perf_timers_addr(),
941 PerfClassTraceTime::CLASS_LINK);
942
943 // verification & rewriting
944 {
945 HandleMark hm(THREAD);
946 Handle h_init_lock(THREAD, init_lock());
947 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
948 // rewritten will have been set if loader constraint error found
949 // on an earlier link attempt
950 // don't verify or rewrite if already rewritten
951 //
952
953 if (!is_linked()) {
954 if (!is_rewritten()) {
955 {
956 bool verify_ok = verify_code(THREAD);
957 if (!verify_ok) {
958 return false;
959 }
960 }
961
962 // Just in case a side-effect of verify linked this class already
963 // (which can sometimes happen since the verifier loads classes
964 // using custom class loaders, which are free to initialize things)
965 if (is_linked()) {
966 return true;
967 }
968
969 // also sets rewritten
970 rewrite_class(CHECK_false);
971 } else if (is_shared()) {
972 SystemDictionaryShared::check_verification_constraints(this, CHECK_false);
973 }
974
975 // relocate jsrs and link methods after they are all rewritten
976 link_methods(CHECK_false);
977
978 // Initialize the vtable and interface table after
979 // methods have been rewritten since rewrite may
980 // fabricate new Method*s.
981 // also does loader constraint checking
982 //
983 // initialize_vtable and initialize_itable need to be rerun
984 // for a shared class if
985 // 1) the class is loaded by custom class loader or
986 // 2) the class is loaded by built-in class loader but failed to add archived loader constraints
987 bool need_init_table = true;
988 if (is_shared() && SystemDictionaryShared::check_linking_constraints(this, THREAD)) {
989 need_init_table = false;
990 }
991 if (need_init_table) {
992 vtable().initialize_vtable(true, CHECK_false);
993 itable().initialize_itable(true, CHECK_false);
994 }
995 #ifdef ASSERT
996 vtable().verify(tty, true);
997 // In case itable verification is ever added.
998 // itable().verify(tty, true);
999 #endif
1000 set_init_state(linked);
1001 if (JvmtiExport::should_post_class_prepare()) {
1002 Thread *thread = THREAD;
1003 assert(thread->is_Java_thread(), "thread->is_Java_thread()");
1004 JvmtiExport::post_class_prepare((JavaThread *) thread, this);
1005 }
1006 }
1007 }
1008 return true;
1009 }
1010
1011 // Rewrite the byte codes of all of the methods of a class.
1012 // The rewriter must be called exactly once. Rewriting must happen after
1013 // verification but before the first method of the class is executed.
1014 void InstanceKlass::rewrite_class(TRAPS) {
1015 assert(is_loaded(), "must be loaded");
1016 if (is_rewritten()) {
1017 assert(is_shared(), "rewriting an unshared class?");
1018 return;
1019 }
1020 Rewriter::rewrite(this, CHECK);
1021 set_rewritten();
1022 }
1023
1024 // Now relocate and link method entry points after class is rewritten.
1025 // This is outside is_rewritten flag. In case of an exception, it can be
1026 // executed more than once.
1027 void InstanceKlass::link_methods(TRAPS) {
1028 int len = methods()->length();
1029 for (int i = len-1; i >= 0; i--) {
1030 methodHandle m(THREAD, methods()->at(i));
1031
1032 // Set up method entry points for compiler and interpreter .
1033 m->link_method(m, CHECK);
1034 }
1035 }
1036
1037 // Eagerly initialize superinterfaces that declare default methods (concrete instance: any access)
1038 void InstanceKlass::initialize_super_interfaces(TRAPS) {
1039 assert (has_nonstatic_concrete_methods(), "caller should have checked this");
1040 for (int i = 0; i < local_interfaces()->length(); ++i) {
1041 InstanceKlass* ik = local_interfaces()->at(i);
1042
1043 // Initialization is depth first search ie. we start with top of the inheritance tree
1044 // has_nonstatic_concrete_methods drives searching superinterfaces since it
1045 // means has_nonstatic_concrete_methods in its superinterface hierarchy
1046 if (ik->has_nonstatic_concrete_methods()) {
1047 ik->initialize_super_interfaces(CHECK);
1048 }
1049
1050 // Only initialize() interfaces that "declare" concrete methods.
1051 if (ik->should_be_initialized() && ik->declares_nonstatic_concrete_methods()) {
1052 ik->initialize(CHECK);
1053 }
1054 }
1055 }
1056
1057 void InstanceKlass::initialize_impl(TRAPS) {
1058 HandleMark hm(THREAD);
1059
1060 // Make sure klass is linked (verified) before initialization
1061 // A class could already be verified, since it has been reflected upon.
1062 link_class(CHECK);
1063
1064 DTRACE_CLASSINIT_PROBE(required, -1);
1065
1066 bool wait = false;
1067
1068 assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl");
1069 JavaThread* jt = (JavaThread*)THREAD;
1070
1071 // refer to the JVM book page 47 for description of steps
1072 // Step 1
1073 {
1074 Handle h_init_lock(THREAD, init_lock());
1075 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
1076
1077 // Step 2
1078 // If we were to use wait() instead of waitInterruptibly() then
1079 // we might end up throwing IE from link/symbol resolution sites
1080 // that aren't expected to throw. This would wreak havoc. See 6320309.
1081 while (is_being_initialized() && !is_reentrant_initialization(jt)) {
1082 wait = true;
1083 jt->set_class_to_be_initialized(this);
1084 ol.wait_uninterruptibly(jt);
1085 jt->set_class_to_be_initialized(NULL);
1086 }
1087
1088 // Step 3
1089 if (is_being_initialized() && is_reentrant_initialization(jt)) {
1090 DTRACE_CLASSINIT_PROBE_WAIT(recursive, -1, wait);
1091 return;
1092 }
1093
1094 // Step 4
1095 if (is_initialized()) {
1096 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, -1, wait);
1097 return;
1098 }
1099
1100 // Step 5
1101 if (is_in_error_state()) {
1102 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait);
1103 ResourceMark rm(THREAD);
1104 const char* desc = "Could not initialize class ";
1105 const char* className = external_name();
1106 size_t msglen = strlen(desc) + strlen(className) + 1;
1107 char* message = NEW_RESOURCE_ARRAY(char, msglen);
1108 if (NULL == message) {
1109 // Out of memory: can't create detailed error message
1110 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className);
1111 } else {
1112 jio_snprintf(message, msglen, "%s%s", desc, className);
1113 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message);
1114 }
1115 }
1116
1117 // Step 6
1118 set_init_state(being_initialized);
1119 set_init_thread(jt);
1120 }
1121
1122 // Step 7
1123 // Next, if C is a class rather than an interface, initialize it's super class and super
1124 // interfaces.
1125 if (!is_interface()) {
1126 Klass* super_klass = super();
1127 if (super_klass != NULL && super_klass->should_be_initialized()) {
1128 super_klass->initialize(THREAD);
1129 }
1130 // If C implements any interface that declares a non-static, concrete method,
1131 // the initialization of C triggers initialization of its super interfaces.
1132 // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and
1133 // having a superinterface that declares, non-static, concrete methods
1134 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) {
1135 initialize_super_interfaces(THREAD);
1136 }
1137
1138 // If any exceptions, complete abruptly, throwing the same exception as above.
1139 if (HAS_PENDING_EXCEPTION) {
1140 Handle e(THREAD, PENDING_EXCEPTION);
1141 CLEAR_PENDING_EXCEPTION;
1142 {
1143 EXCEPTION_MARK;
1144 // Locks object, set state, and notify all waiting threads
1145 set_initialization_state_and_notify(initialization_error, THREAD);
1146 CLEAR_PENDING_EXCEPTION;
1147 }
1148 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait);
1149 THROW_OOP(e());
1150 }
1151 }
1152
1153
1154 // Look for aot compiled methods for this klass, including class initializer.
1155 AOTLoader::load_for_klass(this, THREAD);
1156
1157 // Step 8
1158 {
1159 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
1160 // Timer includes any side effects of class initialization (resolution,
1161 // etc), but not recursive entry into call_class_initializer().
1162 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
1163 ClassLoader::perf_class_init_selftime(),
1164 ClassLoader::perf_classes_inited(),
1165 jt->get_thread_stat()->perf_recursion_counts_addr(),
1166 jt->get_thread_stat()->perf_timers_addr(),
1167 PerfClassTraceTime::CLASS_CLINIT);
1168 call_class_initializer(THREAD);
1169 }
1170
1171 // Step 9
1172 if (!HAS_PENDING_EXCEPTION) {
1173 set_initialization_state_and_notify(fully_initialized, CHECK);
1174 {
1175 debug_only(vtable().verify(tty, true);)
1176 }
1177 }
1178 else {
1179 // Step 10 and 11
1180 Handle e(THREAD, PENDING_EXCEPTION);
1181 CLEAR_PENDING_EXCEPTION;
1182 // JVMTI has already reported the pending exception
1183 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1184 JvmtiExport::clear_detected_exception(jt);
1185 {
1186 EXCEPTION_MARK;
1187 set_initialization_state_and_notify(initialization_error, THREAD);
1188 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below
1189 // JVMTI has already reported the pending exception
1190 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1191 JvmtiExport::clear_detected_exception(jt);
1192 }
1193 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
1194 if (e->is_a(SystemDictionary::Error_klass())) {
1195 THROW_OOP(e());
1196 } else {
1197 JavaCallArguments args(e);
1198 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
1199 vmSymbols::throwable_void_signature(),
1200 &args);
1201 }
1202 }
1203 DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait);
1204 }
1205
1206
1207 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) {
1208 Handle h_init_lock(THREAD, init_lock());
1209 if (h_init_lock() != NULL) {
1210 ObjectLocker ol(h_init_lock, THREAD);
1211 set_init_thread(NULL); // reset _init_thread before changing _init_state
1212 set_init_state(state);
1213 fence_and_clear_init_lock();
1214 ol.notify_all(CHECK);
1215 } else {
1216 assert(h_init_lock() != NULL, "The initialization state should never be set twice");
1217 set_init_thread(NULL); // reset _init_thread before changing _init_state
1218 set_init_state(state);
1219 }
1220 }
1221
1222 Klass* InstanceKlass::implementor() const {
1223 Klass* volatile* k = adr_implementor();
1224 if (k == NULL) {
1225 return NULL;
1226 } else {
1227 // This load races with inserts, and therefore needs acquire.
1228 Klass* kls = Atomic::load_acquire(k);
1229 if (kls != NULL && !kls->is_loader_alive()) {
1230 return NULL; // don't return unloaded class
1231 } else {
1232 return kls;
1233 }
1234 }
1235 }
1236
1237
1238 void InstanceKlass::set_implementor(Klass* k) {
1239 assert_locked_or_safepoint(Compile_lock);
1240 assert(is_interface(), "not interface");
1241 Klass* volatile* addr = adr_implementor();
1242 assert(addr != NULL, "null addr");
1243 if (addr != NULL) {
1244 Atomic::release_store(addr, k);
1245 }
1246 }
1247
1248 int InstanceKlass::nof_implementors() const {
1249 Klass* k = implementor();
1250 if (k == NULL) {
1251 return 0;
1252 } else if (k != this) {
1253 return 1;
1254 } else {
1255 return 2;
1256 }
1257 }
1258
1259 // The embedded _implementor field can only record one implementor.
1260 // When there are more than one implementors, the _implementor field
1261 // is set to the interface Klass* itself. Following are the possible
1262 // values for the _implementor field:
1263 // NULL - no implementor
1264 // implementor Klass* - one implementor
1265 // self - more than one implementor
1266 //
1267 // The _implementor field only exists for interfaces.
1268 void InstanceKlass::add_implementor(Klass* k) {
1269 if (Universe::is_fully_initialized()) {
1270 assert_lock_strong(Compile_lock);
1271 }
1272 assert(is_interface(), "not interface");
1273 // Filter out my subinterfaces.
1274 // (Note: Interfaces are never on the subklass list.)
1275 if (InstanceKlass::cast(k)->is_interface()) return;
1276
1277 // Filter out subclasses whose supers already implement me.
1278 // (Note: CHA must walk subclasses of direct implementors
1279 // in order to locate indirect implementors.)
1280 Klass* sk = k->super();
1281 if (sk != NULL && InstanceKlass::cast(sk)->implements_interface(this))
1282 // We only need to check one immediate superclass, since the
1283 // implements_interface query looks at transitive_interfaces.
1284 // Any supers of the super have the same (or fewer) transitive_interfaces.
1285 return;
1286
1287 Klass* ik = implementor();
1288 if (ik == NULL) {
1289 set_implementor(k);
1290 } else if (ik != this && ik != k) {
1291 // There is already an implementor. Use itself as an indicator of
1292 // more than one implementors.
1293 set_implementor(this);
1294 }
1295
1296 // The implementor also implements the transitive_interfaces
1297 for (int index = 0; index < local_interfaces()->length(); index++) {
1298 InstanceKlass::cast(local_interfaces()->at(index))->add_implementor(k);
1299 }
1300 }
1301
1302 void InstanceKlass::init_implementor() {
1303 if (is_interface()) {
1304 set_implementor(NULL);
1305 }
1306 }
1307
1308
1309 void InstanceKlass::process_interfaces(Thread *thread) {
1310 // link this class into the implementors list of every interface it implements
1311 for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
1312 assert(local_interfaces()->at(i)->is_klass(), "must be a klass");
1313 InstanceKlass* interf = InstanceKlass::cast(local_interfaces()->at(i));
1314 assert(interf->is_interface(), "expected interface");
1315 interf->add_implementor(this);
1316 }
1317 }
1318
1319 bool InstanceKlass::can_be_primary_super_slow() const {
1320 if (is_interface())
1321 return false;
1322 else
1323 return Klass::can_be_primary_super_slow();
1324 }
1325
1326 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots,
1327 Array<InstanceKlass*>* transitive_interfaces) {
1328 // The secondaries are the implemented interfaces.
1329 Array<InstanceKlass*>* interfaces = transitive_interfaces;
1330 int num_secondaries = num_extra_slots + interfaces->length();
1331 if (num_secondaries == 0) {
1332 // Must share this for correct bootstrapping!
1333 set_secondary_supers(Universe::the_empty_klass_array());
1334 return NULL;
1335 } else if (num_extra_slots == 0) {
1336 // The secondary super list is exactly the same as the transitive interfaces, so
1337 // let's use it instead of making a copy.
1338 // Redefine classes has to be careful not to delete this!
1339 // We need the cast because Array<Klass*> is NOT a supertype of Array<InstanceKlass*>,
1340 // (but it's safe to do here because we won't write into _secondary_supers from this point on).
1341 set_secondary_supers((Array<Klass*>*)(address)interfaces);
1342 return NULL;
1343 } else {
1344 // Copy transitive interfaces to a temporary growable array to be constructed
1345 // into the secondary super list with extra slots.
1346 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length());
1347 for (int i = 0; i < interfaces->length(); i++) {
1348 secondaries->push(interfaces->at(i));
1349 }
1350 return secondaries;
1351 }
1352 }
1353
1354 bool InstanceKlass::implements_interface(Klass* k) const {
1355 if (this == k) return true;
1356 assert(k->is_interface(), "should be an interface class");
1357 for (int i = 0; i < transitive_interfaces()->length(); i++) {
1358 if (transitive_interfaces()->at(i) == k) {
1359 return true;
1360 }
1361 }
1362 return false;
1363 }
1364
1365 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const {
1366 // Verify direct super interface
1367 if (this == k) return true;
1368 assert(k->is_interface(), "should be an interface class");
1369 for (int i = 0; i < local_interfaces()->length(); i++) {
1370 if (local_interfaces()->at(i) == k) {
1371 return true;
1372 }
1373 }
1374 return false;
1375 }
1376
1377 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) {
1378 check_array_allocation_length(length, arrayOopDesc::max_array_length(T_OBJECT), CHECK_NULL);
1379 int size = objArrayOopDesc::object_size(length);
1380 Klass* ak = array_klass(n, CHECK_NULL);
1381 objArrayOop o = (objArrayOop)Universe::heap()->array_allocate(ak, size, length,
1382 /* do_zero */ true, CHECK_NULL);
1383 return o;
1384 }
1385
1386 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
1387 if (TraceFinalizerRegistration) {
1388 tty->print("Registered ");
1389 i->print_value_on(tty);
1390 tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", p2i(i));
1391 }
1392 instanceHandle h_i(THREAD, i);
1393 // Pass the handle as argument, JavaCalls::call expects oop as jobjects
1394 JavaValue result(T_VOID);
1395 JavaCallArguments args(h_i);
1396 methodHandle mh (THREAD, Universe::finalizer_register_method());
1397 JavaCalls::call(&result, mh, &args, CHECK_NULL);
1398 return h_i();
1399 }
1400
1401 instanceOop InstanceKlass::allocate_instance(TRAPS) {
1402 bool has_finalizer_flag = has_finalizer(); // Query before possible GC
1403 int size = size_helper(); // Query before forming handle.
1404
1405 instanceOop i;
1406
1407 i = (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL);
1408 if (has_finalizer_flag && !RegisterFinalizersAtInit) {
1409 i = register_finalizer(i, CHECK_NULL);
1410 }
1411 return i;
1412 }
1413
1414 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) {
1415 return instanceHandle(THREAD, allocate_instance(THREAD));
1416 }
1417
1418 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1419 if (is_interface() || is_abstract()) {
1420 ResourceMark rm(THREAD);
1421 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1422 : vmSymbols::java_lang_InstantiationException(), external_name());
1423 }
1424 if (this == SystemDictionary::Class_klass()) {
1425 ResourceMark rm(THREAD);
1426 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1427 : vmSymbols::java_lang_IllegalAccessException(), external_name());
1428 }
1429 }
1430
1431 Klass* InstanceKlass::array_klass_impl(bool or_null, int n, TRAPS) {
1432 // Need load-acquire for lock-free read
1433 if (array_klasses_acquire() == NULL) {
1434 if (or_null) return NULL;
1435
1436 ResourceMark rm(THREAD);
1437 JavaThread *jt = (JavaThread *)THREAD;
1438 {
1439 // Atomic creation of array_klasses
1440 MutexLocker ma(THREAD, MultiArray_lock);
1441
1442 // Check if update has already taken place
1443 if (array_klasses() == NULL) {
1444 ObjArrayKlass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this, CHECK_NULL);
1445 // use 'release' to pair with lock-free load
1446 release_set_array_klasses(k);
1447 }
1448 }
1449 }
1450 // _this will always be set at this point
1451 ObjArrayKlass* oak = array_klasses();
1452 if (or_null) {
1453 return oak->array_klass_or_null(n);
1454 }
1455 return oak->array_klass(n, THREAD);
1456 }
1457
1458 Klass* InstanceKlass::array_klass_impl(bool or_null, TRAPS) {
1459 return array_klass_impl(or_null, 1, THREAD);
1460 }
1461
1462 static int call_class_initializer_counter = 0; // for debugging
1463
1464 Method* InstanceKlass::class_initializer() const {
1465 Method* clinit = find_method(
1466 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1467 if (clinit != NULL && clinit->has_valid_initializer_flags()) {
1468 return clinit;
1469 }
1470 return NULL;
1471 }
1472
1473 void InstanceKlass::call_class_initializer(TRAPS) {
1474 if (ReplayCompiles &&
1475 (ReplaySuppressInitializers == 1 ||
1476 (ReplaySuppressInitializers >= 2 && class_loader() != NULL))) {
1477 // Hide the existence of the initializer for the purpose of replaying the compile
1478 return;
1479 }
1480
1481 methodHandle h_method(THREAD, class_initializer());
1482 assert(!is_initialized(), "we cannot initialize twice");
1483 LogTarget(Info, class, init) lt;
1484 if (lt.is_enabled()) {
1485 ResourceMark rm(THREAD);
1486 LogStream ls(lt);
1487 ls.print("%d Initializing ", call_class_initializer_counter++);
1488 name()->print_value_on(&ls);
1489 ls.print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", p2i(this));
1490 }
1491 if (h_method() != NULL) {
1492 JavaCallArguments args; // No arguments
1493 JavaValue result(T_VOID);
1494 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1495 }
1496 }
1497
1498
1499 void InstanceKlass::mask_for(const methodHandle& method, int bci,
1500 InterpreterOopMap* entry_for) {
1501 // Lazily create the _oop_map_cache at first request
1502 // Lock-free access requires load_acquire.
1503 OopMapCache* oop_map_cache = Atomic::load_acquire(&_oop_map_cache);
1504 if (oop_map_cache == NULL) {
1505 MutexLocker x(OopMapCacheAlloc_lock);
1506 // Check if _oop_map_cache was allocated while we were waiting for this lock
1507 if ((oop_map_cache = _oop_map_cache) == NULL) {
1508 oop_map_cache = new OopMapCache();
1509 // Ensure _oop_map_cache is stable, since it is examined without a lock
1510 Atomic::release_store(&_oop_map_cache, oop_map_cache);
1511 }
1512 }
1513 // _oop_map_cache is constant after init; lookup below does its own locking.
1514 oop_map_cache->lookup(method, bci, entry_for);
1515 }
1516
1517 bool InstanceKlass::contains_field_offset(int offset) {
1518 fieldDescriptor fd;
1519 return find_field_from_offset(offset, false, &fd);
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, TRAPS), TRAPS) {
1689 if (array_klasses() != NULL)
1690 array_klasses()->array_klasses_do(f, THREAD);
1691 }
1692
1693 void InstanceKlass::array_klasses_do(void f(Klass* k)) {
1694 if (array_klasses() != NULL)
1695 array_klasses()->array_klasses_do(f);
1696 }
1697
1698 #ifdef ASSERT
1699 static int linear_search(const Array<Method*>* methods,
1700 const Symbol* name,
1701 const Symbol* signature) {
1702 const int len = methods->length();
1703 for (int index = 0; index < len; index++) {
1704 const Method* const m = methods->at(index);
1705 assert(m->is_method(), "must be method");
1706 if (m->signature() == signature && m->name() == name) {
1707 return index;
1708 }
1709 }
1710 return -1;
1711 }
1712 #endif
1713
1714 bool InstanceKlass::_disable_method_binary_search = false;
1715
1716 NOINLINE int linear_search(const Array<Method*>* methods, const Symbol* name) {
1717 int len = methods->length();
1718 int l = 0;
1719 int h = len - 1;
1720 while (l <= h) {
1721 Method* m = methods->at(l);
1722 if (m->name() == name) {
1723 return l;
1724 }
1725 l++;
1726 }
1727 return -1;
1728 }
1729
1730 inline int InstanceKlass::quick_search(const Array<Method*>* methods, const Symbol* name) {
1731 if (_disable_method_binary_search) {
1732 assert(DynamicDumpSharedSpaces, "must be");
1733 // At the final stage of dynamic dumping, the methods array may not be sorted
1734 // by ascending addresses of their names, so we can't use binary search anymore.
1735 // However, methods with the same name are still laid out consecutively inside the
1736 // methods array, so let's look for the first one that matches.
1737 return linear_search(methods, name);
1738 }
1739
1740 int len = methods->length();
1741 int l = 0;
1742 int h = len - 1;
1743
1744 // methods are sorted by ascending addresses of their names, so do binary search
1745 while (l <= h) {
1746 int mid = (l + h) >> 1;
1747 Method* m = methods->at(mid);
1748 assert(m->is_method(), "must be method");
1749 int res = m->name()->fast_compare(name);
1750 if (res == 0) {
1751 return mid;
1752 } else if (res < 0) {
1753 l = mid + 1;
1754 } else {
1755 h = mid - 1;
1756 }
1757 }
1758 return -1;
1759 }
1760
1761 // find_method looks up the name/signature in the local methods array
1762 Method* InstanceKlass::find_method(const Symbol* name,
1763 const Symbol* signature) const {
1764 return find_method_impl(name, signature, find_overpass, find_static, find_private);
1765 }
1766
1767 Method* InstanceKlass::find_method_impl(const Symbol* name,
1768 const Symbol* signature,
1769 OverpassLookupMode overpass_mode,
1770 StaticLookupMode static_mode,
1771 PrivateLookupMode private_mode) const {
1772 return InstanceKlass::find_method_impl(methods(),
1773 name,
1774 signature,
1775 overpass_mode,
1776 static_mode,
1777 private_mode);
1778 }
1779
1780 // find_instance_method looks up the name/signature in the local methods array
1781 // and skips over static methods
1782 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods,
1783 const Symbol* name,
1784 const Symbol* signature,
1785 PrivateLookupMode private_mode) {
1786 Method* const meth = InstanceKlass::find_method_impl(methods,
1787 name,
1788 signature,
1789 find_overpass,
1790 skip_static,
1791 private_mode);
1792 assert(((meth == NULL) || !meth->is_static()),
1793 "find_instance_method should have skipped statics");
1794 return meth;
1795 }
1796
1797 // find_instance_method looks up the name/signature in the local methods array
1798 // and skips over static methods
1799 Method* InstanceKlass::find_instance_method(const Symbol* name,
1800 const Symbol* signature,
1801 PrivateLookupMode private_mode) const {
1802 return InstanceKlass::find_instance_method(methods(), name, signature, private_mode);
1803 }
1804
1805 // Find looks up the name/signature in the local methods array
1806 // and filters on the overpass, static and private flags
1807 // This returns the first one found
1808 // note that the local methods array can have up to one overpass, one static
1809 // and one instance (private or not) with the same name/signature
1810 Method* InstanceKlass::find_local_method(const Symbol* name,
1811 const Symbol* signature,
1812 OverpassLookupMode overpass_mode,
1813 StaticLookupMode static_mode,
1814 PrivateLookupMode private_mode) const {
1815 return InstanceKlass::find_method_impl(methods(),
1816 name,
1817 signature,
1818 overpass_mode,
1819 static_mode,
1820 private_mode);
1821 }
1822
1823 // Find looks up the name/signature in the local methods array
1824 // and filters on the overpass, static and private flags
1825 // This returns the first one found
1826 // note that the local methods array can have up to one overpass, one static
1827 // and one instance (private or not) with the same name/signature
1828 Method* InstanceKlass::find_local_method(const Array<Method*>* methods,
1829 const Symbol* name,
1830 const Symbol* signature,
1831 OverpassLookupMode overpass_mode,
1832 StaticLookupMode static_mode,
1833 PrivateLookupMode private_mode) {
1834 return InstanceKlass::find_method_impl(methods,
1835 name,
1836 signature,
1837 overpass_mode,
1838 static_mode,
1839 private_mode);
1840 }
1841
1842 Method* InstanceKlass::find_method(const Array<Method*>* methods,
1843 const Symbol* name,
1844 const Symbol* signature) {
1845 return InstanceKlass::find_method_impl(methods,
1846 name,
1847 signature,
1848 find_overpass,
1849 find_static,
1850 find_private);
1851 }
1852
1853 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods,
1854 const Symbol* name,
1855 const Symbol* signature,
1856 OverpassLookupMode overpass_mode,
1857 StaticLookupMode static_mode,
1858 PrivateLookupMode private_mode) {
1859 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode);
1860 return hit >= 0 ? methods->at(hit): NULL;
1861 }
1862
1863 // true if method matches signature and conforms to skipping_X conditions.
1864 static bool method_matches(const Method* m,
1865 const Symbol* signature,
1866 bool skipping_overpass,
1867 bool skipping_static,
1868 bool skipping_private) {
1869 return ((m->signature() == signature) &&
1870 (!skipping_overpass || !m->is_overpass()) &&
1871 (!skipping_static || !m->is_static()) &&
1872 (!skipping_private || !m->is_private()));
1873 }
1874
1875 // Used directly for default_methods to find the index into the
1876 // default_vtable_indices, and indirectly by find_method
1877 // find_method_index looks in the local methods array to return the index
1878 // of the matching name/signature. If, overpass methods are being ignored,
1879 // the search continues to find a potential non-overpass match. This capability
1880 // is important during method resolution to prefer a static method, for example,
1881 // over an overpass method.
1882 // There is the possibility in any _method's array to have the same name/signature
1883 // for a static method, an overpass method and a local instance method
1884 // To correctly catch a given method, the search criteria may need
1885 // to explicitly skip the other two. For local instance methods, it
1886 // is often necessary to skip private methods
1887 int InstanceKlass::find_method_index(const Array<Method*>* methods,
1888 const Symbol* name,
1889 const Symbol* signature,
1890 OverpassLookupMode overpass_mode,
1891 StaticLookupMode static_mode,
1892 PrivateLookupMode private_mode) {
1893 const bool skipping_overpass = (overpass_mode == skip_overpass);
1894 const bool skipping_static = (static_mode == skip_static);
1895 const bool skipping_private = (private_mode == skip_private);
1896 const int hit = quick_search(methods, name);
1897 if (hit != -1) {
1898 const Method* const m = methods->at(hit);
1899
1900 // Do linear search to find matching signature. First, quick check
1901 // for common case, ignoring overpasses if requested.
1902 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1903 return hit;
1904 }
1905
1906 // search downwards through overloaded methods
1907 int i;
1908 for (i = hit - 1; i >= 0; --i) {
1909 const Method* const m = methods->at(i);
1910 assert(m->is_method(), "must be method");
1911 if (m->name() != name) {
1912 break;
1913 }
1914 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1915 return i;
1916 }
1917 }
1918 // search upwards
1919 for (i = hit + 1; i < methods->length(); ++i) {
1920 const Method* const m = methods->at(i);
1921 assert(m->is_method(), "must be method");
1922 if (m->name() != name) {
1923 break;
1924 }
1925 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1926 return i;
1927 }
1928 }
1929 // not found
1930 #ifdef ASSERT
1931 const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 :
1932 linear_search(methods, name, signature);
1933 assert(-1 == index, "binary search should have found entry %d", index);
1934 #endif
1935 }
1936 return -1;
1937 }
1938
1939 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const {
1940 return find_method_by_name(methods(), name, end);
1941 }
1942
1943 int InstanceKlass::find_method_by_name(const Array<Method*>* methods,
1944 const Symbol* name,
1945 int* end_ptr) {
1946 assert(end_ptr != NULL, "just checking");
1947 int start = quick_search(methods, name);
1948 int end = start + 1;
1949 if (start != -1) {
1950 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
1951 while (end < methods->length() && (methods->at(end))->name() == name) ++end;
1952 *end_ptr = end;
1953 return start;
1954 }
1955 return -1;
1956 }
1957
1958 // uncached_lookup_method searches both the local class methods array and all
1959 // superclasses methods arrays, skipping any overpass methods in superclasses,
1960 // and possibly skipping private methods.
1961 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
1962 const Symbol* signature,
1963 OverpassLookupMode overpass_mode,
1964 PrivateLookupMode private_mode) const {
1965 OverpassLookupMode overpass_local_mode = overpass_mode;
1966 const Klass* klass = this;
1967 while (klass != NULL) {
1968 Method* const method = InstanceKlass::cast(klass)->find_method_impl(name,
1969 signature,
1970 overpass_local_mode,
1971 find_static,
1972 private_mode);
1973 if (method != NULL) {
1974 return method;
1975 }
1976 klass = klass->super();
1977 overpass_local_mode = skip_overpass; // Always ignore overpass methods in superclasses
1978 }
1979 return NULL;
1980 }
1981
1982 #ifdef ASSERT
1983 // search through class hierarchy and return true if this class or
1984 // one of the superclasses was redefined
1985 bool InstanceKlass::has_redefined_this_or_super() const {
1986 const Klass* klass = this;
1987 while (klass != NULL) {
1988 if (InstanceKlass::cast(klass)->has_been_redefined()) {
1989 return true;
1990 }
1991 klass = klass->super();
1992 }
1993 return false;
1994 }
1995 #endif
1996
1997 // lookup a method in the default methods list then in all transitive interfaces
1998 // Do NOT return private or static methods
1999 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
2000 Symbol* signature) const {
2001 Method* m = NULL;
2002 if (default_methods() != NULL) {
2003 m = find_method(default_methods(), name, signature);
2004 }
2005 // Look up interfaces
2006 if (m == NULL) {
2007 m = lookup_method_in_all_interfaces(name, signature, find_defaults);
2008 }
2009 return m;
2010 }
2011
2012 // lookup a method in all the interfaces that this class implements
2013 // Do NOT return private or static methods, new in JDK8 which are not externally visible
2014 // They should only be found in the initial InterfaceMethodRef
2015 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
2016 Symbol* signature,
2017 DefaultsLookupMode defaults_mode) const {
2018 Array<InstanceKlass*>* all_ifs = transitive_interfaces();
2019 int num_ifs = all_ifs->length();
2020 InstanceKlass *ik = NULL;
2021 for (int i = 0; i < num_ifs; i++) {
2022 ik = all_ifs->at(i);
2023 Method* m = ik->lookup_method(name, signature);
2024 if (m != NULL && m->is_public() && !m->is_static() &&
2025 ((defaults_mode != skip_defaults) || !m->is_default_method())) {
2026 return m;
2027 }
2028 }
2029 return NULL;
2030 }
2031
2032 /* jni_id_for_impl for jfieldIds only */
2033 JNIid* InstanceKlass::jni_id_for_impl(int offset) {
2034 MutexLocker ml(JfieldIdCreation_lock);
2035 // Retry lookup after we got the lock
2036 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
2037 if (probe == NULL) {
2038 // Slow case, allocate new static field identifier
2039 probe = new JNIid(this, offset, jni_ids());
2040 set_jni_ids(probe);
2041 }
2042 return probe;
2043 }
2044
2045
2046 /* jni_id_for for jfieldIds only */
2047 JNIid* InstanceKlass::jni_id_for(int offset) {
2048 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
2049 if (probe == NULL) {
2050 probe = jni_id_for_impl(offset);
2051 }
2052 return probe;
2053 }
2054
2055 u2 InstanceKlass::enclosing_method_data(int offset) const {
2056 const Array<jushort>* const inner_class_list = inner_classes();
2057 if (inner_class_list == NULL) {
2058 return 0;
2059 }
2060 const int length = inner_class_list->length();
2061 if (length % inner_class_next_offset == 0) {
2062 return 0;
2063 }
2064 const int index = length - enclosing_method_attribute_size;
2065 assert(offset < enclosing_method_attribute_size, "invalid offset");
2066 return inner_class_list->at(index + offset);
2067 }
2068
2069 void InstanceKlass::set_enclosing_method_indices(u2 class_index,
2070 u2 method_index) {
2071 Array<jushort>* inner_class_list = inner_classes();
2072 assert (inner_class_list != NULL, "_inner_classes list is not set up");
2073 int length = inner_class_list->length();
2074 if (length % inner_class_next_offset == enclosing_method_attribute_size) {
2075 int index = length - enclosing_method_attribute_size;
2076 inner_class_list->at_put(
2077 index + enclosing_method_class_index_offset, class_index);
2078 inner_class_list->at_put(
2079 index + enclosing_method_method_index_offset, method_index);
2080 }
2081 }
2082
2083 // Lookup or create a jmethodID.
2084 // This code is called by the VMThread and JavaThreads so the
2085 // locking has to be done very carefully to avoid deadlocks
2086 // and/or other cache consistency problems.
2087 //
2088 jmethodID InstanceKlass::get_jmethod_id(const methodHandle& method_h) {
2089 size_t idnum = (size_t)method_h->method_idnum();
2090 jmethodID* jmeths = methods_jmethod_ids_acquire();
2091 size_t length = 0;
2092 jmethodID id = NULL;
2093
2094 // We use a double-check locking idiom here because this cache is
2095 // performance sensitive. In the normal system, this cache only
2096 // transitions from NULL to non-NULL which is safe because we use
2097 // release_set_methods_jmethod_ids() to advertise the new cache.
2098 // A partially constructed cache should never be seen by a racing
2099 // thread. We also use release_store() to save a new jmethodID
2100 // in the cache so a partially constructed jmethodID should never be
2101 // seen either. Cache reads of existing jmethodIDs proceed without a
2102 // lock, but cache writes of a new jmethodID requires uniqueness and
2103 // creation of the cache itself requires no leaks so a lock is
2104 // generally acquired in those two cases.
2105 //
2106 // If the RedefineClasses() API has been used, then this cache can
2107 // grow and we'll have transitions from non-NULL to bigger non-NULL.
2108 // Cache creation requires no leaks and we require safety between all
2109 // cache accesses and freeing of the old cache so a lock is generally
2110 // acquired when the RedefineClasses() API has been used.
2111
2112 if (jmeths != NULL) {
2113 // the cache already exists
2114 if (!idnum_can_increment()) {
2115 // the cache can't grow so we can just get the current values
2116 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2117 } else {
2118 // cache can grow so we have to be more careful
2119 if (Threads::number_of_threads() == 0 ||
2120 SafepointSynchronize::is_at_safepoint()) {
2121 // we're single threaded or at a safepoint - no locking needed
2122 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2123 } else {
2124 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2125 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2126 }
2127 }
2128 }
2129 // implied else:
2130 // we need to allocate a cache so default length and id values are good
2131
2132 if (jmeths == NULL || // no cache yet
2133 length <= idnum || // cache is too short
2134 id == NULL) { // cache doesn't contain entry
2135
2136 // This function can be called by the VMThread so we have to do all
2137 // things that might block on a safepoint before grabbing the lock.
2138 // Otherwise, we can deadlock with the VMThread or have a cache
2139 // consistency issue. These vars keep track of what we might have
2140 // to free after the lock is dropped.
2141 jmethodID to_dealloc_id = NULL;
2142 jmethodID* to_dealloc_jmeths = NULL;
2143
2144 // may not allocate new_jmeths or use it if we allocate it
2145 jmethodID* new_jmeths = NULL;
2146 if (length <= idnum) {
2147 // allocate a new cache that might be used
2148 size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count());
2149 new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1, mtClass);
2150 memset(new_jmeths, 0, (size+1)*sizeof(jmethodID));
2151 // cache size is stored in element[0], other elements offset by one
2152 new_jmeths[0] = (jmethodID)size;
2153 }
2154
2155 // allocate a new jmethodID that might be used
2156 jmethodID new_id = NULL;
2157 if (method_h->is_old() && !method_h->is_obsolete()) {
2158 // The method passed in is old (but not obsolete), we need to use the current version
2159 Method* current_method = method_with_idnum((int)idnum);
2160 assert(current_method != NULL, "old and but not obsolete, so should exist");
2161 new_id = Method::make_jmethod_id(class_loader_data(), current_method);
2162 } else {
2163 // It is the current version of the method or an obsolete method,
2164 // use the version passed in
2165 new_id = Method::make_jmethod_id(class_loader_data(), method_h());
2166 }
2167
2168 if (Threads::number_of_threads() == 0 ||
2169 SafepointSynchronize::is_at_safepoint()) {
2170 // we're single threaded or at a safepoint - no locking needed
2171 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2172 &to_dealloc_id, &to_dealloc_jmeths);
2173 } else {
2174 MutexLocker ml(JmethodIdCreation_lock, Mutex::_no_safepoint_check_flag);
2175 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2176 &to_dealloc_id, &to_dealloc_jmeths);
2177 }
2178
2179 // The lock has been dropped so we can free resources.
2180 // Free up either the old cache or the new cache if we allocated one.
2181 if (to_dealloc_jmeths != NULL) {
2182 FreeHeap(to_dealloc_jmeths);
2183 }
2184 // free up the new ID since it wasn't needed
2185 if (to_dealloc_id != NULL) {
2186 Method::destroy_jmethod_id(class_loader_data(), to_dealloc_id);
2187 }
2188 }
2189 return id;
2190 }
2191
2192 // Figure out how many jmethodIDs haven't been allocated, and make
2193 // sure space for them is pre-allocated. This makes getting all
2194 // method ids much, much faster with classes with more than 8
2195 // methods, and has a *substantial* effect on performance with jvmti
2196 // code that loads all jmethodIDs for all classes.
2197 void InstanceKlass::ensure_space_for_methodids(int start_offset) {
2198 int new_jmeths = 0;
2199 int length = methods()->length();
2200 for (int index = start_offset; index < length; index++) {
2201 Method* m = methods()->at(index);
2202 jmethodID id = m->find_jmethod_id_or_null();
2203 if (id == NULL) {
2204 new_jmeths++;
2205 }
2206 }
2207 if (new_jmeths != 0) {
2208 Method::ensure_jmethod_ids(class_loader_data(), new_jmeths);
2209 }
2210 }
2211
2212 // Common code to fetch the jmethodID from the cache or update the
2213 // cache with the new jmethodID. This function should never do anything
2214 // that causes the caller to go to a safepoint or we can deadlock with
2215 // the VMThread or have cache consistency issues.
2216 //
2217 jmethodID InstanceKlass::get_jmethod_id_fetch_or_update(
2218 size_t idnum, jmethodID new_id,
2219 jmethodID* new_jmeths, jmethodID* to_dealloc_id_p,
2220 jmethodID** to_dealloc_jmeths_p) {
2221 assert(new_id != NULL, "sanity check");
2222 assert(to_dealloc_id_p != NULL, "sanity check");
2223 assert(to_dealloc_jmeths_p != NULL, "sanity check");
2224 assert(Threads::number_of_threads() == 0 ||
2225 SafepointSynchronize::is_at_safepoint() ||
2226 JmethodIdCreation_lock->owned_by_self(), "sanity check");
2227
2228 // reacquire the cache - we are locked, single threaded or at a safepoint
2229 jmethodID* jmeths = methods_jmethod_ids_acquire();
2230 jmethodID id = NULL;
2231 size_t length = 0;
2232
2233 if (jmeths == NULL || // no cache yet
2234 (length = (size_t)jmeths[0]) <= idnum) { // cache is too short
2235 if (jmeths != NULL) {
2236 // copy any existing entries from the old cache
2237 for (size_t index = 0; index < length; index++) {
2238 new_jmeths[index+1] = jmeths[index+1];
2239 }
2240 *to_dealloc_jmeths_p = jmeths; // save old cache for later delete
2241 }
2242 release_set_methods_jmethod_ids(jmeths = new_jmeths);
2243 } else {
2244 // fetch jmethodID (if any) from the existing cache
2245 id = jmeths[idnum+1];
2246 *to_dealloc_jmeths_p = new_jmeths; // save new cache for later delete
2247 }
2248 if (id == NULL) {
2249 // No matching jmethodID in the existing cache or we have a new
2250 // cache or we just grew the cache. This cache write is done here
2251 // by the first thread to win the foot race because a jmethodID
2252 // needs to be unique once it is generally available.
2253 id = new_id;
2254
2255 // The jmethodID cache can be read while unlocked so we have to
2256 // make sure the new jmethodID is complete before installing it
2257 // in the cache.
2258 Atomic::release_store(&jmeths[idnum+1], id);
2259 } else {
2260 *to_dealloc_id_p = new_id; // save new id for later delete
2261 }
2262 return id;
2263 }
2264
2265
2266 // Common code to get the jmethodID cache length and the jmethodID
2267 // value at index idnum if there is one.
2268 //
2269 void InstanceKlass::get_jmethod_id_length_value(jmethodID* cache,
2270 size_t idnum, size_t *length_p, jmethodID* id_p) {
2271 assert(cache != NULL, "sanity check");
2272 assert(length_p != NULL, "sanity check");
2273 assert(id_p != NULL, "sanity check");
2274
2275 // cache size is stored in element[0], other elements offset by one
2276 *length_p = (size_t)cache[0];
2277 if (*length_p <= idnum) { // cache is too short
2278 *id_p = NULL;
2279 } else {
2280 *id_p = cache[idnum+1]; // fetch jmethodID (if any)
2281 }
2282 }
2283
2284
2285 // Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles
2286 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
2287 size_t idnum = (size_t)method->method_idnum();
2288 jmethodID* jmeths = methods_jmethod_ids_acquire();
2289 size_t length; // length assigned as debugging crumb
2290 jmethodID id = NULL;
2291 if (jmeths != NULL && // If there is a cache
2292 (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough,
2293 id = jmeths[idnum+1]; // Look up the id (may be NULL)
2294 }
2295 return id;
2296 }
2297
2298 inline DependencyContext InstanceKlass::dependencies() {
2299 DependencyContext dep_context(&_dep_context, &_dep_context_last_cleaned);
2300 return dep_context;
2301 }
2302
2303 int InstanceKlass::mark_dependent_nmethods(KlassDepChange& changes) {
2304 return dependencies().mark_dependent_nmethods(changes);
2305 }
2306
2307 void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
2308 dependencies().add_dependent_nmethod(nm);
2309 }
2310
2311 void InstanceKlass::remove_dependent_nmethod(nmethod* nm) {
2312 dependencies().remove_dependent_nmethod(nm);
2313 }
2314
2315 void InstanceKlass::clean_dependency_context() {
2316 dependencies().clean_unloading_dependents();
2317 }
2318
2319 #ifndef PRODUCT
2320 void InstanceKlass::print_dependent_nmethods(bool verbose) {
2321 dependencies().print_dependent_nmethods(verbose);
2322 }
2323
2324 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
2325 return dependencies().is_dependent_nmethod(nm);
2326 }
2327 #endif //PRODUCT
2328
2329 void InstanceKlass::clean_weak_instanceklass_links() {
2330 clean_implementors_list();
2331 clean_method_data();
2332 }
2333
2334 void InstanceKlass::clean_implementors_list() {
2335 assert(is_loader_alive(), "this klass should be live");
2336 if (is_interface()) {
2337 assert (ClassUnloading, "only called for ClassUnloading");
2338 for (;;) {
2339 // Use load_acquire due to competing with inserts
2340 Klass* impl = Atomic::load_acquire(adr_implementor());
2341 if (impl != NULL && !impl->is_loader_alive()) {
2342 // NULL this field, might be an unloaded klass or NULL
2343 Klass* volatile* klass = adr_implementor();
2344 if (Atomic::cmpxchg(klass, impl, (Klass*)NULL) == impl) {
2345 // Successfully unlinking implementor.
2346 if (log_is_enabled(Trace, class, unload)) {
2347 ResourceMark rm;
2348 log_trace(class, unload)("unlinking class (implementor): %s", impl->external_name());
2349 }
2350 return;
2351 }
2352 } else {
2353 return;
2354 }
2355 }
2356 }
2357 }
2358
2359 void InstanceKlass::clean_method_data() {
2360 for (int m = 0; m < methods()->length(); m++) {
2361 MethodData* mdo = methods()->at(m)->method_data();
2362 if (mdo != NULL) {
2363 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : mdo->extra_data_lock());
2364 mdo->clean_method_data(/*always_clean*/false);
2365 }
2366 }
2367 }
2368
2369 bool InstanceKlass::supers_have_passed_fingerprint_checks() {
2370 if (java_super() != NULL && !java_super()->has_passed_fingerprint_check()) {
2371 ResourceMark rm;
2372 log_trace(class, fingerprint)("%s : super %s not fingerprinted", external_name(), java_super()->external_name());
2373 return false;
2374 }
2375
2376 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
2377 if (local_interfaces != NULL) {
2378 int length = local_interfaces->length();
2379 for (int i = 0; i < length; i++) {
2380 InstanceKlass* intf = local_interfaces->at(i);
2381 if (!intf->has_passed_fingerprint_check()) {
2382 ResourceMark rm;
2383 log_trace(class, fingerprint)("%s : interface %s not fingerprinted", external_name(), intf->external_name());
2384 return false;
2385 }
2386 }
2387 }
2388
2389 return true;
2390 }
2391
2392 bool InstanceKlass::should_store_fingerprint(bool is_hidden_or_anonymous) {
2393 #if INCLUDE_AOT
2394 // We store the fingerprint into the InstanceKlass only in the following 2 cases:
2395 if (CalculateClassFingerprint) {
2396 // (1) We are running AOT to generate a shared library.
2397 return true;
2398 }
2399 if (Arguments::is_dumping_archive()) {
2400 // (2) We are running -Xshare:dump or -XX:ArchiveClassesAtExit to create a shared archive
2401 return true;
2402 }
2403 if (UseAOT && is_hidden_or_anonymous) {
2404 // (3) We are using AOT code from a shared library and see a hidden or unsafe anonymous class
2405 return true;
2406 }
2407 #endif
2408
2409 // In all other cases we might set the _misc_has_passed_fingerprint_check bit,
2410 // but do not store the 64-bit fingerprint to save space.
2411 return false;
2412 }
2413
2414 bool InstanceKlass::has_stored_fingerprint() const {
2415 #if INCLUDE_AOT
2416 return should_store_fingerprint() || is_shared();
2417 #else
2418 return false;
2419 #endif
2420 }
2421
2422 uint64_t InstanceKlass::get_stored_fingerprint() const {
2423 address adr = adr_fingerprint();
2424 if (adr != NULL) {
2425 return (uint64_t)Bytes::get_native_u8(adr); // adr may not be 64-bit aligned
2426 }
2427 return 0;
2428 }
2429
2430 void InstanceKlass::store_fingerprint(uint64_t fingerprint) {
2431 address adr = adr_fingerprint();
2432 if (adr != NULL) {
2433 Bytes::put_native_u8(adr, (u8)fingerprint); // adr may not be 64-bit aligned
2434
2435 ResourceMark rm;
2436 log_trace(class, fingerprint)("stored as " PTR64_FORMAT " for class %s", fingerprint, external_name());
2437 }
2438 }
2439
2440 void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) {
2441 Klass::metaspace_pointers_do(it);
2442
2443 if (log_is_enabled(Trace, cds)) {
2444 ResourceMark rm;
2445 log_trace(cds)("Iter(InstanceKlass): %p (%s)", this, external_name());
2446 }
2447
2448 it->push(&_annotations);
2449 it->push((Klass**)&_array_klasses);
2450 it->push(&_constants);
2451 it->push(&_inner_classes);
2452 #if INCLUDE_JVMTI
2453 it->push(&_previous_versions);
2454 #endif
2455 it->push(&_methods);
2456 it->push(&_default_methods);
2457 it->push(&_local_interfaces);
2458 it->push(&_transitive_interfaces);
2459 it->push(&_method_ordering);
2460 it->push(&_default_vtable_indices);
2461 it->push(&_fields);
2462
2463 if (itable_length() > 0) {
2464 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2465 int method_table_offset_in_words = ioe->offset()/wordSize;
2466 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
2467 / itableOffsetEntry::size();
2468
2469 for (int i = 0; i < nof_interfaces; i ++, ioe ++) {
2470 if (ioe->interface_klass() != NULL) {
2471 it->push(ioe->interface_klass_addr());
2472 itableMethodEntry* ime = ioe->first_method_entry(this);
2473 int n = klassItable::method_count_for_interface(ioe->interface_klass());
2474 for (int index = 0; index < n; index ++) {
2475 it->push(ime[index].method_addr());
2476 }
2477 }
2478 }
2479 }
2480
2481 it->push(&_nest_members);
2482 it->push(&_permitted_subclasses);
2483 it->push(&_record_components);
2484 }
2485
2486 void InstanceKlass::remove_unshareable_info() {
2487 Klass::remove_unshareable_info();
2488
2489 if (SystemDictionaryShared::has_class_failed_verification(this)) {
2490 // Classes are attempted to link during dumping and may fail,
2491 // but these classes are still in the dictionary and class list in CLD.
2492 // If the class has failed verification, there is nothing else to remove.
2493 return;
2494 }
2495
2496 // Reset to the 'allocated' state to prevent any premature accessing to
2497 // a shared class at runtime while the class is still being loaded and
2498 // restored. A class' init_state is set to 'loaded' at runtime when it's
2499 // being added to class hierarchy (see SystemDictionary:::add_to_hierarchy()).
2500 _init_state = allocated;
2501
2502 { // Otherwise this needs to take out the Compile_lock.
2503 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
2504 init_implementor();
2505 }
2506
2507 constants()->remove_unshareable_info();
2508
2509 for (int i = 0; i < methods()->length(); i++) {
2510 Method* m = methods()->at(i);
2511 m->remove_unshareable_info();
2512 }
2513
2514 // do array classes also.
2515 if (array_klasses() != NULL) {
2516 array_klasses()->remove_unshareable_info();
2517 }
2518
2519 // These are not allocated from metaspace. They are safe to set to NULL.
2520 _source_debug_extension = NULL;
2521 _dep_context = NULL;
2522 _osr_nmethods_head = NULL;
2523 #if INCLUDE_JVMTI
2524 _breakpoints = NULL;
2525 _previous_versions = NULL;
2526 _cached_class_file = NULL;
2527 _jvmti_cached_class_field_map = NULL;
2528 #endif
2529
2530 _init_thread = NULL;
2531 _methods_jmethod_ids = NULL;
2532 _jni_ids = NULL;
2533 _oop_map_cache = NULL;
2534 // clear _nest_host to ensure re-load at runtime
2535 _nest_host = NULL;
2536 _package_entry = NULL;
2537 _dep_context_last_cleaned = 0;
2538 }
2539
2540 void InstanceKlass::remove_java_mirror() {
2541 Klass::remove_java_mirror();
2542
2543 // do array classes also.
2544 if (array_klasses() != NULL) {
2545 array_klasses()->remove_java_mirror();
2546 }
2547 }
2548
2549 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain,
2550 PackageEntry* pkg_entry, TRAPS) {
2551 // SystemDictionary::add_to_hierarchy() sets the init_state to loaded
2552 // before the InstanceKlass is added to the SystemDictionary. Make
2553 // sure the current state is <loaded.
2554 assert(!is_loaded(), "invalid init state");
2555 set_package(loader_data, pkg_entry, CHECK);
2556 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
2557
2558 Array<Method*>* methods = this->methods();
2559 int num_methods = methods->length();
2560 for (int index = 0; index < num_methods; ++index) {
2561 methods->at(index)->restore_unshareable_info(CHECK);
2562 }
2563 if (JvmtiExport::has_redefined_a_class()) {
2564 // Reinitialize vtable because RedefineClasses may have changed some
2565 // entries in this vtable for super classes so the CDS vtable might
2566 // point to old or obsolete entries. RedefineClasses doesn't fix up
2567 // vtables in the shared system dictionary, only the main one.
2568 // It also redefines the itable too so fix that too.
2569 vtable().initialize_vtable(false, CHECK);
2570 itable().initialize_itable(false, CHECK);
2571 }
2572
2573 // restore constant pool resolved references
2574 constants()->restore_unshareable_info(CHECK);
2575
2576 if (array_klasses() != NULL) {
2577 // Array classes have null protection domain.
2578 // --> see ArrayKlass::complete_create_array_klass()
2579 array_klasses()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
2580 }
2581
2582 // Initialize current biased locking state.
2583 if (UseBiasedLocking && BiasedLocking::enabled()) {
2584 set_prototype_header(markWord::biased_locking_prototype());
2585 }
2586 }
2587
2588 void InstanceKlass::set_shared_class_loader_type(s2 loader_type) {
2589 switch (loader_type) {
2590 case ClassLoader::BOOT_LOADER:
2591 _misc_flags |= _misc_is_shared_boot_class;
2592 break;
2593 case ClassLoader::PLATFORM_LOADER:
2594 _misc_flags |= _misc_is_shared_platform_class;
2595 break;
2596 case ClassLoader::APP_LOADER:
2597 _misc_flags |= _misc_is_shared_app_class;
2598 break;
2599 default:
2600 ShouldNotReachHere();
2601 break;
2602 }
2603 }
2604
2605 void InstanceKlass::assign_class_loader_type() {
2606 ClassLoaderData *cld = class_loader_data();
2607 if (cld->is_boot_class_loader_data()) {
2608 set_shared_class_loader_type(ClassLoader::BOOT_LOADER);
2609 }
2610 else if (cld->is_platform_class_loader_data()) {
2611 set_shared_class_loader_type(ClassLoader::PLATFORM_LOADER);
2612 }
2613 else if (cld->is_system_class_loader_data()) {
2614 set_shared_class_loader_type(ClassLoader::APP_LOADER);
2615 }
2616 }
2617
2618 #if INCLUDE_JVMTI
2619 static void clear_all_breakpoints(Method* m) {
2620 m->clear_all_breakpoints();
2621 }
2622 #endif
2623
2624 void InstanceKlass::unload_class(InstanceKlass* ik) {
2625 // Release dependencies.
2626 ik->dependencies().remove_all_dependents();
2627
2628 // notify the debugger
2629 if (JvmtiExport::should_post_class_unload()) {
2630 JvmtiExport::post_class_unload(ik);
2631 }
2632
2633 // notify ClassLoadingService of class unload
2634 ClassLoadingService::notify_class_unloaded(ik);
2635
2636 if (Arguments::is_dumping_archive()) {
2637 SystemDictionaryShared::remove_dumptime_info(ik);
2638 }
2639
2640 if (log_is_enabled(Info, class, unload)) {
2641 ResourceMark rm;
2642 log_info(class, unload)("unloading class %s " INTPTR_FORMAT, ik->external_name(), p2i(ik));
2643 }
2644
2645 Events::log_class_unloading(Thread::current(), ik);
2646
2647 #if INCLUDE_JFR
2648 assert(ik != NULL, "invariant");
2649 EventClassUnload event;
2650 event.set_unloadedClass(ik);
2651 event.set_definingClassLoader(ik->class_loader_data());
2652 event.commit();
2653 #endif
2654 }
2655
2656 static void method_release_C_heap_structures(Method* m) {
2657 m->release_C_heap_structures();
2658 }
2659
2660 void InstanceKlass::release_C_heap_structures() {
2661
2662 // Clean up C heap
2663 release_C_heap_structures_internal();
2664 constants()->release_C_heap_structures();
2665
2666 // Deallocate and call destructors for MDO mutexes
2667 methods_do(method_release_C_heap_structures);
2668 }
2669
2670 void InstanceKlass::release_C_heap_structures_internal() {
2671 Klass::release_C_heap_structures();
2672
2673 // Can't release the constant pool here because the constant pool can be
2674 // deallocated separately from the InstanceKlass for default methods and
2675 // redefine classes.
2676
2677 // Deallocate oop map cache
2678 if (_oop_map_cache != NULL) {
2679 delete _oop_map_cache;
2680 _oop_map_cache = NULL;
2681 }
2682
2683 // Deallocate JNI identifiers for jfieldIDs
2684 JNIid::deallocate(jni_ids());
2685 set_jni_ids(NULL);
2686
2687 jmethodID* jmeths = methods_jmethod_ids_acquire();
2688 if (jmeths != (jmethodID*)NULL) {
2689 release_set_methods_jmethod_ids(NULL);
2690 FreeHeap(jmeths);
2691 }
2692
2693 assert(_dep_context == NULL,
2694 "dependencies should already be cleaned");
2695
2696 #if INCLUDE_JVMTI
2697 // Deallocate breakpoint records
2698 if (breakpoints() != 0x0) {
2699 methods_do(clear_all_breakpoints);
2700 assert(breakpoints() == 0x0, "should have cleared breakpoints");
2701 }
2702
2703 // deallocate the cached class file
2704 if (_cached_class_file != NULL) {
2705 os::free(_cached_class_file);
2706 _cached_class_file = NULL;
2707 }
2708 #endif
2709
2710 FREE_C_HEAP_ARRAY(char, _source_debug_extension);
2711 }
2712
2713 void InstanceKlass::set_source_debug_extension(const char* array, int length) {
2714 if (array == NULL) {
2715 _source_debug_extension = NULL;
2716 } else {
2717 // Adding one to the attribute length in order to store a null terminator
2718 // character could cause an overflow because the attribute length is
2719 // already coded with an u4 in the classfile, but in practice, it's
2720 // unlikely to happen.
2721 assert((length+1) > length, "Overflow checking");
2722 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
2723 for (int i = 0; i < length; i++) {
2724 sde[i] = array[i];
2725 }
2726 sde[length] = '\0';
2727 _source_debug_extension = sde;
2728 }
2729 }
2730
2731 const char* InstanceKlass::signature_name() const {
2732 int hash_len = 0;
2733 char hash_buf[40];
2734
2735 // If this is an unsafe anonymous class, append a hash to make the name unique
2736 if (is_unsafe_anonymous()) {
2737 intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0;
2738 jio_snprintf(hash_buf, sizeof(hash_buf), "/" UINTX_FORMAT, (uintx)hash);
2739 hash_len = (int)strlen(hash_buf);
2740 }
2741
2742 // Get the internal name as a c string
2743 const char* src = (const char*) (name()->as_C_string());
2744 const int src_length = (int)strlen(src);
2745
2746 char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3);
2747
2748 // Add L as type indicator
2749 int dest_index = 0;
2750 dest[dest_index++] = JVM_SIGNATURE_CLASS;
2751
2752 // Add the actual class name
2753 for (int src_index = 0; src_index < src_length; ) {
2754 dest[dest_index++] = src[src_index++];
2755 }
2756
2757 if (is_hidden()) { // Replace the last '+' with a '.'.
2758 for (int index = (int)src_length; index > 0; index--) {
2759 if (dest[index] == '+') {
2760 dest[index] = JVM_SIGNATURE_DOT;
2761 break;
2762 }
2763 }
2764 }
2765
2766 // If we have a hash, append it
2767 for (int hash_index = 0; hash_index < hash_len; ) {
2768 dest[dest_index++] = hash_buf[hash_index++];
2769 }
2770
2771 // Add the semicolon and the NULL
2772 dest[dest_index++] = JVM_SIGNATURE_ENDCLASS;
2773 dest[dest_index] = '\0';
2774 return dest;
2775 }
2776
2777 ModuleEntry* InstanceKlass::module() const {
2778 // For an unsafe anonymous class return the host class' module
2779 if (is_unsafe_anonymous()) {
2780 assert(unsafe_anonymous_host() != NULL, "unsafe anonymous class must have a host class");
2781 return unsafe_anonymous_host()->module();
2782 }
2783
2784 if (is_hidden() &&
2785 in_unnamed_package() &&
2786 class_loader_data()->has_class_mirror_holder()) {
2787 // For a non-strong hidden class defined to an unnamed package,
2788 // its (class held) CLD will not have an unnamed module created for it.
2789 // Two choices to find the correct ModuleEntry:
2790 // 1. If hidden class is within a nest, use nest host's module
2791 // 2. Find the unnamed module off from the class loader
2792 // For now option #2 is used since a nest host is not set until
2793 // after the instance class is created in jvm_lookup_define_class().
2794 if (class_loader_data()->is_boot_class_loader_data()) {
2795 return ClassLoaderData::the_null_class_loader_data()->unnamed_module();
2796 } else {
2797 oop module = java_lang_ClassLoader::unnamedModule(class_loader_data()->class_loader());
2798 assert(java_lang_Module::is_instance(module), "Not an instance of java.lang.Module");
2799 return java_lang_Module::module_entry(module);
2800 }
2801 }
2802
2803 // Class is in a named package
2804 if (!in_unnamed_package()) {
2805 return _package_entry->module();
2806 }
2807
2808 // Class is in an unnamed package, return its loader's unnamed module
2809 return class_loader_data()->unnamed_module();
2810 }
2811
2812 void InstanceKlass::set_package(ClassLoaderData* loader_data, PackageEntry* pkg_entry, TRAPS) {
2813
2814 // ensure java/ packages only loaded by boot or platform builtin loaders
2815 // not needed for shared class since CDS does not archive prohibited classes.
2816 if (!is_shared()) {
2817 check_prohibited_package(name(), loader_data, CHECK);
2818 }
2819
2820 TempNewSymbol pkg_name = pkg_entry != NULL ? pkg_entry->name() : ClassLoader::package_from_class_name(name());
2821
2822 if (pkg_name != NULL && loader_data != NULL) {
2823
2824 // Find in class loader's package entry table.
2825 _package_entry = pkg_entry != NULL ? pkg_entry : loader_data->packages()->lookup_only(pkg_name);
2826
2827 // If the package name is not found in the loader's package
2828 // entry table, it is an indication that the package has not
2829 // been defined. Consider it defined within the unnamed module.
2830 if (_package_entry == NULL) {
2831
2832 if (!ModuleEntryTable::javabase_defined()) {
2833 // Before java.base is defined during bootstrapping, define all packages in
2834 // the java.base module. If a non-java.base package is erroneously placed
2835 // in the java.base module it will be caught later when java.base
2836 // is defined by ModuleEntryTable::verify_javabase_packages check.
2837 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, JAVA_BASE_NAME " module is NULL");
2838 _package_entry = loader_data->packages()->lookup(pkg_name, ModuleEntryTable::javabase_moduleEntry());
2839 } else {
2840 assert(loader_data->unnamed_module() != NULL, "unnamed module is NULL");
2841 _package_entry = loader_data->packages()->lookup(pkg_name,
2842 loader_data->unnamed_module());
2843 }
2844
2845 // A package should have been successfully created
2846 DEBUG_ONLY(ResourceMark rm(THREAD));
2847 assert(_package_entry != NULL, "Package entry for class %s not found, loader %s",
2848 name()->as_C_string(), loader_data->loader_name_and_id());
2849 }
2850
2851 if (log_is_enabled(Debug, module)) {
2852 ResourceMark rm(THREAD);
2853 ModuleEntry* m = _package_entry->module();
2854 log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s",
2855 external_name(),
2856 pkg_name->as_C_string(),
2857 loader_data->loader_name_and_id(),
2858 (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE));
2859 }
2860 } else {
2861 ResourceMark rm(THREAD);
2862 log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s",
2863 external_name(),
2864 (loader_data != NULL) ? loader_data->loader_name_and_id() : "NULL",
2865 UNNAMED_MODULE);
2866 }
2867 }
2868
2869 // Function set_classpath_index checks if the package of the InstanceKlass is in the
2870 // boot loader's package entry table. If so, then it sets the classpath_index
2871 // in the package entry record.
2872 //
2873 // The classpath_index field is used to find the entry on the boot loader class
2874 // path for packages with classes loaded by the boot loader from -Xbootclasspath/a
2875 // in an unnamed module. It is also used to indicate (for all packages whose
2876 // classes are loaded by the boot loader) that at least one of the package's
2877 // classes has been loaded.
2878 void InstanceKlass::set_classpath_index(s2 path_index, TRAPS) {
2879 if (_package_entry != NULL) {
2880 DEBUG_ONLY(PackageEntryTable* pkg_entry_tbl = ClassLoaderData::the_null_class_loader_data()->packages();)
2881 assert(pkg_entry_tbl->lookup_only(_package_entry->name()) == _package_entry, "Should be same");
2882 assert(path_index != -1, "Unexpected classpath_index");
2883 _package_entry->set_classpath_index(path_index);
2884 }
2885 }
2886
2887 // different versions of is_same_class_package
2888
2889 bool InstanceKlass::is_same_class_package(const Klass* class2) const {
2890 oop classloader1 = this->class_loader();
2891 PackageEntry* classpkg1 = this->package();
2892 if (class2->is_objArray_klass()) {
2893 class2 = ObjArrayKlass::cast(class2)->bottom_klass();
2894 }
2895
2896 oop classloader2;
2897 PackageEntry* classpkg2;
2898 if (class2->is_instance_klass()) {
2899 classloader2 = class2->class_loader();
2900 classpkg2 = class2->package();
2901 } else {
2902 assert(class2->is_typeArray_klass(), "should be type array");
2903 classloader2 = NULL;
2904 classpkg2 = NULL;
2905 }
2906
2907 // Same package is determined by comparing class loader
2908 // and package entries. Both must be the same. This rule
2909 // applies even to classes that are defined in the unnamed
2910 // package, they still must have the same class loader.
2911 if ((classloader1 == classloader2) && (classpkg1 == classpkg2)) {
2912 return true;
2913 }
2914
2915 return false;
2916 }
2917
2918 // return true if this class and other_class are in the same package. Classloader
2919 // and classname information is enough to determine a class's package
2920 bool InstanceKlass::is_same_class_package(oop other_class_loader,
2921 const Symbol* other_class_name) const {
2922 if (class_loader() != other_class_loader) {
2923 return false;
2924 }
2925 if (name()->fast_compare(other_class_name) == 0) {
2926 return true;
2927 }
2928
2929 {
2930 ResourceMark rm;
2931
2932 bool bad_class_name = false;
2933 TempNewSymbol other_pkg = ClassLoader::package_from_class_name(other_class_name, &bad_class_name);
2934 if (bad_class_name) {
2935 return false;
2936 }
2937 // Check that package_from_class_name() returns NULL, not "", if there is no package.
2938 assert(other_pkg == NULL || other_pkg->utf8_length() > 0, "package name is empty string");
2939
2940 const Symbol* const this_package_name =
2941 this->package() != NULL ? this->package()->name() : NULL;
2942
2943 if (this_package_name == NULL || other_pkg == NULL) {
2944 // One of the two doesn't have a package. Only return true if the other
2945 // one also doesn't have a package.
2946 return this_package_name == other_pkg;
2947 }
2948
2949 // Check if package is identical
2950 return this_package_name->fast_compare(other_pkg) == 0;
2951 }
2952 }
2953
2954 // Returns true iff super_method can be overridden by a method in targetclassname
2955 // See JLS 3rd edition 8.4.6.1
2956 // Assumes name-signature match
2957 // "this" is InstanceKlass of super_method which must exist
2958 // note that the InstanceKlass of the method in the targetclassname has not always been created yet
2959 bool InstanceKlass::is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) {
2960 // Private methods can not be overridden
2961 if (super_method->is_private()) {
2962 return false;
2963 }
2964 // If super method is accessible, then override
2965 if ((super_method->is_protected()) ||
2966 (super_method->is_public())) {
2967 return true;
2968 }
2969 // Package-private methods are not inherited outside of package
2970 assert(super_method->is_package_private(), "must be package private");
2971 return(is_same_class_package(targetclassloader(), targetclassname));
2972 }
2973
2974 // Only boot and platform class loaders can define classes in "java/" packages.
2975 void InstanceKlass::check_prohibited_package(Symbol* class_name,
2976 ClassLoaderData* loader_data,
2977 TRAPS) {
2978 if (!loader_data->is_boot_class_loader_data() &&
2979 !loader_data->is_platform_class_loader_data() &&
2980 class_name != NULL) {
2981 ResourceMark rm(THREAD);
2982 char* name = class_name->as_C_string();
2983 if (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/') {
2984 TempNewSymbol pkg_name = ClassLoader::package_from_class_name(class_name);
2985 assert(pkg_name != NULL, "Error in parsing package name starting with 'java/'");
2986 name = pkg_name->as_C_string();
2987 const char* class_loader_name = loader_data->loader_name_and_id();
2988 StringUtils::replace_no_expand(name, "/", ".");
2989 const char* msg_text1 = "Class loader (instance of): ";
2990 const char* msg_text2 = " tried to load prohibited package name: ";
2991 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1;
2992 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
2993 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name);
2994 THROW_MSG(vmSymbols::java_lang_SecurityException(), message);
2995 }
2996 }
2997 return;
2998 }
2999
3000 bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const {
3001 constantPoolHandle i_cp(THREAD, constants());
3002 for (InnerClassesIterator iter(this); !iter.done(); iter.next()) {
3003 int ioff = iter.inner_class_info_index();
3004 if (ioff != 0) {
3005 // Check to see if the name matches the class we're looking for
3006 // before attempting to find the class.
3007 if (i_cp->klass_name_at_matches(this, ioff)) {
3008 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false);
3009 if (this == inner_klass) {
3010 *ooff = iter.outer_class_info_index();
3011 *noff = iter.inner_name_index();
3012 return true;
3013 }
3014 }
3015 }
3016 }
3017 return false;
3018 }
3019
3020 InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const {
3021 InstanceKlass* outer_klass = NULL;
3022 *inner_is_member = false;
3023 int ooff = 0, noff = 0;
3024 bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD);
3025 if (has_inner_classes_attr) {
3026 constantPoolHandle i_cp(THREAD, constants());
3027 if (ooff != 0) {
3028 Klass* ok = i_cp->klass_at(ooff, CHECK_NULL);
3029 outer_klass = InstanceKlass::cast(ok);
3030 *inner_is_member = true;
3031 }
3032 if (NULL == outer_klass) {
3033 // It may be a local or anonymous class; try for that.
3034 int encl_method_class_idx = enclosing_method_class_index();
3035 if (encl_method_class_idx != 0) {
3036 Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
3037 outer_klass = InstanceKlass::cast(ok);
3038 *inner_is_member = false;
3039 }
3040 }
3041 }
3042
3043 // If no inner class attribute found for this class.
3044 if (NULL == outer_klass) return NULL;
3045
3046 // Throws an exception if outer klass has not declared k as an inner klass
3047 // We need evidence that each klass knows about the other, or else
3048 // the system could allow a spoof of an inner class to gain access rights.
3049 Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL);
3050 return outer_klass;
3051 }
3052
3053 jint InstanceKlass::compute_modifier_flags(TRAPS) const {
3054 jint access = access_flags().as_int();
3055
3056 // But check if it happens to be member class.
3057 InnerClassesIterator iter(this);
3058 for (; !iter.done(); iter.next()) {
3059 int ioff = iter.inner_class_info_index();
3060 // Inner class attribute can be zero, skip it.
3061 // Strange but true: JVM spec. allows null inner class refs.
3062 if (ioff == 0) continue;
3063
3064 // only look at classes that are already loaded
3065 // since we are looking for the flags for our self.
3066 Symbol* inner_name = constants()->klass_name_at(ioff);
3067 if (name() == inner_name) {
3068 // This is really a member class.
3069 access = iter.inner_access_flags();
3070 break;
3071 }
3072 }
3073 // Remember to strip ACC_SUPER bit
3074 return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS;
3075 }
3076
3077 jint InstanceKlass::jvmti_class_status() const {
3078 jint result = 0;
3079
3080 if (is_linked()) {
3081 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
3082 }
3083
3084 if (is_initialized()) {
3085 assert(is_linked(), "Class status is not consistent");
3086 result |= JVMTI_CLASS_STATUS_INITIALIZED;
3087 }
3088 if (is_in_error_state()) {
3089 result |= JVMTI_CLASS_STATUS_ERROR;
3090 }
3091 return result;
3092 }
3093
3094 Method* InstanceKlass::method_at_itable(Klass* holder, int index, TRAPS) {
3095 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
3096 int method_table_offset_in_words = ioe->offset()/wordSize;
3097 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
3098 / itableOffsetEntry::size();
3099
3100 for (int cnt = 0 ; ; cnt ++, ioe ++) {
3101 // If the interface isn't implemented by the receiver class,
3102 // the VM should throw IncompatibleClassChangeError.
3103 if (cnt >= nof_interfaces) {
3104 ResourceMark rm(THREAD);
3105 stringStream ss;
3106 bool same_module = (module() == holder->module());
3107 ss.print("Receiver class %s does not implement "
3108 "the interface %s defining the method to be called "
3109 "(%s%s%s)",
3110 external_name(), holder->external_name(),
3111 (same_module) ? joint_in_module_of_loader(holder) : class_in_module_of_loader(),
3112 (same_module) ? "" : "; ",
3113 (same_module) ? "" : holder->class_in_module_of_loader());
3114 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
3115 }
3116
3117 Klass* ik = ioe->interface_klass();
3118 if (ik == holder) break;
3119 }
3120
3121 itableMethodEntry* ime = ioe->first_method_entry(this);
3122 Method* m = ime[index].method();
3123 if (m == NULL) {
3124 THROW_NULL(vmSymbols::java_lang_AbstractMethodError());
3125 }
3126 return m;
3127 }
3128
3129
3130 #if INCLUDE_JVMTI
3131 // update default_methods for redefineclasses for methods that are
3132 // not yet in the vtable due to concurrent subclass define and superinterface
3133 // redefinition
3134 // Note: those in the vtable, should have been updated via adjust_method_entries
3135 void InstanceKlass::adjust_default_methods(bool* trace_name_printed) {
3136 // search the default_methods for uses of either obsolete or EMCP methods
3137 if (default_methods() != NULL) {
3138 for (int index = 0; index < default_methods()->length(); index ++) {
3139 Method* old_method = default_methods()->at(index);
3140 if (old_method == NULL || !old_method->is_old()) {
3141 continue; // skip uninteresting entries
3142 }
3143 assert(!old_method->is_deleted(), "default methods may not be deleted");
3144 Method* new_method = old_method->get_new_method();
3145 default_methods()->at_put(index, new_method);
3146
3147 if (log_is_enabled(Info, redefine, class, update)) {
3148 ResourceMark rm;
3149 if (!(*trace_name_printed)) {
3150 log_info(redefine, class, update)
3151 ("adjust: klassname=%s default methods from name=%s",
3152 external_name(), old_method->method_holder()->external_name());
3153 *trace_name_printed = true;
3154 }
3155 log_debug(redefine, class, update, vtables)
3156 ("default method update: %s(%s) ",
3157 new_method->name()->as_C_string(), new_method->signature()->as_C_string());
3158 }
3159 }
3160 }
3161 }
3162 #endif // INCLUDE_JVMTI
3163
3164 // On-stack replacement stuff
3165 void InstanceKlass::add_osr_nmethod(nmethod* n) {
3166 assert_lock_strong(CompiledMethod_lock);
3167 #ifndef PRODUCT
3168 if (TieredCompilation) {
3169 nmethod* prev = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), n->comp_level(), true);
3170 assert(prev == NULL || !prev->is_in_use() COMPILER2_PRESENT(|| StressRecompilation),
3171 "redundant OSR recompilation detected. memory leak in CodeCache!");
3172 }
3173 #endif
3174 // only one compilation can be active
3175 {
3176 assert(n->is_osr_method(), "wrong kind of nmethod");
3177 n->set_osr_link(osr_nmethods_head());
3178 set_osr_nmethods_head(n);
3179 // Raise the highest osr level if necessary
3180 if (TieredCompilation) {
3181 Method* m = n->method();
3182 m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level()));
3183 }
3184 }
3185
3186 // Get rid of the osr methods for the same bci that have lower levels.
3187 if (TieredCompilation) {
3188 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) {
3189 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true);
3190 if (inv != NULL && inv->is_in_use()) {
3191 inv->make_not_entrant();
3192 }
3193 }
3194 }
3195 }
3196
3197 // Remove osr nmethod from the list. Return true if found and removed.
3198 bool InstanceKlass::remove_osr_nmethod(nmethod* n) {
3199 // This is a short non-blocking critical region, so the no safepoint check is ok.
3200 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock
3201 , Mutex::_no_safepoint_check_flag);
3202 assert(n->is_osr_method(), "wrong kind of nmethod");
3203 nmethod* last = NULL;
3204 nmethod* cur = osr_nmethods_head();
3205 int max_level = CompLevel_none; // Find the max comp level excluding n
3206 Method* m = n->method();
3207 // Search for match
3208 bool found = false;
3209 while(cur != NULL && cur != n) {
3210 if (TieredCompilation && m == cur->method()) {
3211 // Find max level before n
3212 max_level = MAX2(max_level, cur->comp_level());
3213 }
3214 last = cur;
3215 cur = cur->osr_link();
3216 }
3217 nmethod* next = NULL;
3218 if (cur == n) {
3219 found = true;
3220 next = cur->osr_link();
3221 if (last == NULL) {
3222 // Remove first element
3223 set_osr_nmethods_head(next);
3224 } else {
3225 last->set_osr_link(next);
3226 }
3227 }
3228 n->set_osr_link(NULL);
3229 if (TieredCompilation) {
3230 cur = next;
3231 while (cur != NULL) {
3232 // Find max level after n
3233 if (m == cur->method()) {
3234 max_level = MAX2(max_level, cur->comp_level());
3235 }
3236 cur = cur->osr_link();
3237 }
3238 m->set_highest_osr_comp_level(max_level);
3239 }
3240 return found;
3241 }
3242
3243 int InstanceKlass::mark_osr_nmethods(const Method* m) {
3244 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock,
3245 Mutex::_no_safepoint_check_flag);
3246 nmethod* osr = osr_nmethods_head();
3247 int found = 0;
3248 while (osr != NULL) {
3249 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3250 if (osr->method() == m) {
3251 osr->mark_for_deoptimization();
3252 found++;
3253 }
3254 osr = osr->osr_link();
3255 }
3256 return found;
3257 }
3258
3259 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
3260 MutexLocker ml(CompiledMethod_lock->owned_by_self() ? NULL : CompiledMethod_lock,
3261 Mutex::_no_safepoint_check_flag);
3262 nmethod* osr = osr_nmethods_head();
3263 nmethod* best = NULL;
3264 while (osr != NULL) {
3265 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3266 // There can be a time when a c1 osr method exists but we are waiting
3267 // for a c2 version. When c2 completes its osr nmethod we will trash
3268 // the c1 version and only be able to find the c2 version. However
3269 // while we overflow in the c1 code at back branches we don't want to
3270 // try and switch to the same code as we are already running
3271
3272 if (osr->method() == m &&
3273 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
3274 if (match_level) {
3275 if (osr->comp_level() == comp_level) {
3276 // Found a match - return it.
3277 return osr;
3278 }
3279 } else {
3280 if (best == NULL || (osr->comp_level() > best->comp_level())) {
3281 if (osr->comp_level() == CompLevel_highest_tier) {
3282 // Found the best possible - return it.
3283 return osr;
3284 }
3285 best = osr;
3286 }
3287 }
3288 }
3289 osr = osr->osr_link();
3290 }
3291
3292 assert(match_level == false || best == NULL, "shouldn't pick up anything if match_level is set");
3293 if (best != NULL && best->comp_level() >= comp_level) {
3294 return best;
3295 }
3296 return NULL;
3297 }
3298
3299 // -----------------------------------------------------------------------------------------------------
3300 // Printing
3301
3302 #ifndef PRODUCT
3303
3304 #define BULLET " - "
3305
3306 static const char* state_names[] = {
3307 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
3308 };
3309
3310 static void print_vtable(intptr_t* start, int len, outputStream* st) {
3311 for (int i = 0; i < len; i++) {
3312 intptr_t e = start[i];
3313 st->print("%d : " INTPTR_FORMAT, i, e);
3314 if (MetaspaceObj::is_valid((Metadata*)e)) {
3315 st->print(" ");
3316 ((Metadata*)e)->print_value_on(st);
3317 }
3318 st->cr();
3319 }
3320 }
3321
3322 static void print_vtable(vtableEntry* start, int len, outputStream* st) {
3323 return print_vtable(reinterpret_cast<intptr_t*>(start), len, st);
3324 }
3325
3326 void InstanceKlass::print_on(outputStream* st) const {
3327 assert(is_klass(), "must be klass");
3328 Klass::print_on(st);
3329
3330 st->print(BULLET"instance size: %d", size_helper()); st->cr();
3331 st->print(BULLET"klass size: %d", size()); st->cr();
3332 st->print(BULLET"access: "); access_flags().print_on(st); st->cr();
3333 st->print(BULLET"state: "); st->print_cr("%s", state_names[_init_state]);
3334 st->print(BULLET"name: "); name()->print_value_on(st); st->cr();
3335 st->print(BULLET"super: "); Metadata::print_value_on_maybe_null(st, super()); st->cr();
3336 st->print(BULLET"sub: ");
3337 Klass* sub = subklass();
3338 int n;
3339 for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) {
3340 if (n < MaxSubklassPrintSize) {
3341 sub->print_value_on(st);
3342 st->print(" ");
3343 }
3344 }
3345 if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize);
3346 st->cr();
3347
3348 if (is_interface()) {
3349 st->print_cr(BULLET"nof implementors: %d", nof_implementors());
3350 if (nof_implementors() == 1) {
3351 st->print_cr(BULLET"implementor: ");
3352 st->print(" ");
3353 implementor()->print_value_on(st);
3354 st->cr();
3355 }
3356 }
3357
3358 st->print(BULLET"arrays: "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr();
3359 st->print(BULLET"methods: "); methods()->print_value_on(st); st->cr();
3360 if (Verbose || WizardMode) {
3361 Array<Method*>* method_array = methods();
3362 for (int i = 0; i < method_array->length(); i++) {
3363 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3364 }
3365 }
3366 st->print(BULLET"method ordering: "); method_ordering()->print_value_on(st); st->cr();
3367 st->print(BULLET"default_methods: "); default_methods()->print_value_on(st); st->cr();
3368 if (Verbose && default_methods() != NULL) {
3369 Array<Method*>* method_array = default_methods();
3370 for (int i = 0; i < method_array->length(); i++) {
3371 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3372 }
3373 }
3374 if (default_vtable_indices() != NULL) {
3375 st->print(BULLET"default vtable indices: "); default_vtable_indices()->print_value_on(st); st->cr();
3376 }
3377 st->print(BULLET"local interfaces: "); local_interfaces()->print_value_on(st); st->cr();
3378 st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr();
3379 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr();
3380 if (class_loader_data() != NULL) {
3381 st->print(BULLET"class loader data: ");
3382 class_loader_data()->print_value_on(st);
3383 st->cr();
3384 }
3385 st->print(BULLET"unsafe anonymous host class: "); Metadata::print_value_on_maybe_null(st, unsafe_anonymous_host()); st->cr();
3386 if (source_file_name() != NULL) {
3387 st->print(BULLET"source file: ");
3388 source_file_name()->print_value_on(st);
3389 st->cr();
3390 }
3391 if (source_debug_extension() != NULL) {
3392 st->print(BULLET"source debug extension: ");
3393 st->print("%s", source_debug_extension());
3394 st->cr();
3395 }
3396 st->print(BULLET"class annotations: "); class_annotations()->print_value_on(st); st->cr();
3397 st->print(BULLET"class type annotations: "); class_type_annotations()->print_value_on(st); st->cr();
3398 st->print(BULLET"field annotations: "); fields_annotations()->print_value_on(st); st->cr();
3399 st->print(BULLET"field type annotations: "); fields_type_annotations()->print_value_on(st); st->cr();
3400 {
3401 bool have_pv = false;
3402 // previous versions are linked together through the InstanceKlass
3403 for (InstanceKlass* pv_node = previous_versions();
3404 pv_node != NULL;
3405 pv_node = pv_node->previous_versions()) {
3406 if (!have_pv)
3407 st->print(BULLET"previous version: ");
3408 have_pv = true;
3409 pv_node->constants()->print_value_on(st);
3410 }
3411 if (have_pv) st->cr();
3412 }
3413
3414 if (generic_signature() != NULL) {
3415 st->print(BULLET"generic signature: ");
3416 generic_signature()->print_value_on(st);
3417 st->cr();
3418 }
3419 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr();
3420 st->print(BULLET"nest members: "); nest_members()->print_value_on(st); st->cr();
3421 if (record_components() != NULL) {
3422 st->print(BULLET"record components: "); record_components()->print_value_on(st); st->cr();
3423 }
3424 st->print(BULLET"permitted subclasses: "); permitted_subclasses()->print_value_on(st); st->cr();
3425 if (java_mirror() != NULL) {
3426 st->print(BULLET"java mirror: ");
3427 java_mirror()->print_value_on(st);
3428 st->cr();
3429 } else {
3430 st->print_cr(BULLET"java mirror: NULL");
3431 }
3432 st->print(BULLET"vtable length %d (start addr: " INTPTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
3433 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st);
3434 st->print(BULLET"itable length %d (start addr: " INTPTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
3435 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_itable(), itable_length(), st);
3436 st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
3437 FieldPrinter print_static_field(st);
3438 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
3439 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
3440 FieldPrinter print_nonstatic_field(st);
3441 InstanceKlass* ik = const_cast<InstanceKlass*>(this);
3442 ik->do_nonstatic_fields(&print_nonstatic_field);
3443
3444 st->print(BULLET"non-static oop maps: ");
3445 OopMapBlock* map = start_of_nonstatic_oop_maps();
3446 OopMapBlock* end_map = map + nonstatic_oop_map_count();
3447 while (map < end_map) {
3448 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
3449 map++;
3450 }
3451 st->cr();
3452 }
3453
3454 #endif //PRODUCT
3455
3456 void InstanceKlass::print_value_on(outputStream* st) const {
3457 assert(is_klass(), "must be klass");
3458 if (Verbose || WizardMode) access_flags().print_on(st);
3459 name()->print_value_on(st);
3460 }
3461
3462 #ifndef PRODUCT
3463
3464 void FieldPrinter::do_field(fieldDescriptor* fd) {
3465 _st->print(BULLET);
3466 if (_obj == NULL) {
3467 fd->print_on(_st);
3468 _st->cr();
3469 } else {
3470 fd->print_on_for(_st, _obj);
3471 _st->cr();
3472 }
3473 }
3474
3475
3476 void InstanceKlass::oop_print_on(oop obj, outputStream* st) {
3477 Klass::oop_print_on(obj, st);
3478
3479 if (this == SystemDictionary::String_klass()) {
3480 typeArrayOop value = java_lang_String::value(obj);
3481 juint length = java_lang_String::length(obj);
3482 if (value != NULL &&
3483 value->is_typeArray() &&
3484 length <= (juint) value->length()) {
3485 st->print(BULLET"string: ");
3486 java_lang_String::print(obj, st);
3487 st->cr();
3488 if (!WizardMode) return; // that is enough
3489 }
3490 }
3491
3492 st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj));
3493 FieldPrinter print_field(st, obj);
3494 do_nonstatic_fields(&print_field);
3495
3496 if (this == SystemDictionary::Class_klass()) {
3497 st->print(BULLET"signature: ");
3498 java_lang_Class::print_signature(obj, st);
3499 st->cr();
3500 Klass* mirrored_klass = java_lang_Class::as_Klass(obj);
3501 st->print(BULLET"fake entry for mirror: ");
3502 Metadata::print_value_on_maybe_null(st, mirrored_klass);
3503 st->cr();
3504 Klass* array_klass = java_lang_Class::array_klass_acquire(obj);
3505 st->print(BULLET"fake entry for array: ");
3506 Metadata::print_value_on_maybe_null(st, array_klass);
3507 st->cr();
3508 st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj));
3509 st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj));
3510 Klass* real_klass = java_lang_Class::as_Klass(obj);
3511 if (real_klass != NULL && real_klass->is_instance_klass()) {
3512 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
3513 }
3514 } else if (this == SystemDictionary::MethodType_klass()) {
3515 st->print(BULLET"signature: ");
3516 java_lang_invoke_MethodType::print_signature(obj, st);
3517 st->cr();
3518 }
3519 }
3520
3521 bool InstanceKlass::verify_itable_index(int i) {
3522 int method_count = klassItable::method_count_for_interface(this);
3523 assert(i >= 0 && i < method_count, "index out of bounds");
3524 return true;
3525 }
3526
3527 #endif //PRODUCT
3528
3529 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
3530 st->print("a ");
3531 name()->print_value_on(st);
3532 obj->print_address_on(st);
3533 if (this == SystemDictionary::String_klass()
3534 && java_lang_String::value(obj) != NULL) {
3535 ResourceMark rm;
3536 int len = java_lang_String::length(obj);
3537 int plen = (len < 24 ? len : 12);
3538 char* str = java_lang_String::as_utf8_string(obj, 0, plen);
3539 st->print(" = \"%s\"", str);
3540 if (len > plen)
3541 st->print("...[%d]", len);
3542 } else if (this == SystemDictionary::Class_klass()) {
3543 Klass* k = java_lang_Class::as_Klass(obj);
3544 st->print(" = ");
3545 if (k != NULL) {
3546 k->print_value_on(st);
3547 } else {
3548 const char* tname = type2name(java_lang_Class::primitive_type(obj));
3549 st->print("%s", tname ? tname : "type?");
3550 }
3551 } else if (this == SystemDictionary::MethodType_klass()) {
3552 st->print(" = ");
3553 java_lang_invoke_MethodType::print_signature(obj, st);
3554 } else if (java_lang_boxing_object::is_instance(obj)) {
3555 st->print(" = ");
3556 java_lang_boxing_object::print(obj, st);
3557 } else if (this == SystemDictionary::LambdaForm_klass()) {
3558 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
3559 if (vmentry != NULL) {
3560 st->print(" => ");
3561 vmentry->print_value_on(st);
3562 }
3563 } else if (this == SystemDictionary::MemberName_klass()) {
3564 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
3565 if (vmtarget != NULL) {
3566 st->print(" = ");
3567 vmtarget->print_value_on(st);
3568 } else {
3569 java_lang_invoke_MemberName::clazz(obj)->print_value_on(st);
3570 st->print(".");
3571 java_lang_invoke_MemberName::name(obj)->print_value_on(st);
3572 }
3573 }
3574 }
3575
3576 const char* InstanceKlass::internal_name() const {
3577 return external_name();
3578 }
3579
3580 void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data,
3581 const char* module_name,
3582 const ClassFileStream* cfs) const {
3583 if (!log_is_enabled(Info, class, load)) {
3584 return;
3585 }
3586
3587 ResourceMark rm;
3588 LogMessage(class, load) msg;
3589 stringStream info_stream;
3590
3591 // Name and class hierarchy info
3592 info_stream.print("%s", external_name());
3593
3594 // Source
3595 if (cfs != NULL) {
3596 if (cfs->source() != NULL) {
3597 if (module_name != NULL) {
3598 // When the boot loader created the stream, it didn't know the module name
3599 // yet. Let's format it now.
3600 if (cfs->from_boot_loader_modules_image()) {
3601 info_stream.print(" source: jrt:/%s", module_name);
3602 } else {
3603 info_stream.print(" source: %s", cfs->source());
3604 }
3605 } else {
3606 info_stream.print(" source: %s", cfs->source());
3607 }
3608 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) {
3609 Thread* THREAD = Thread::current();
3610 Klass* caller =
3611 THREAD->is_Java_thread()
3612 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
3613 : NULL;
3614 // caller can be NULL, for example, during a JVMTI VM_Init hook
3615 if (caller != NULL) {
3616 info_stream.print(" source: instance of %s", caller->external_name());
3617 } else {
3618 // source is unknown
3619 }
3620 } else {
3621 oop class_loader = loader_data->class_loader();
3622 info_stream.print(" source: %s", class_loader->klass()->external_name());
3623 }
3624 } else {
3625 assert(this->is_shared(), "must be");
3626 if (MetaspaceShared::is_shared_dynamic((void*)this)) {
3627 info_stream.print(" source: shared objects file (top)");
3628 } else {
3629 info_stream.print(" source: shared objects file");
3630 }
3631 }
3632
3633 msg.info("%s", info_stream.as_string());
3634
3635 if (log_is_enabled(Debug, class, load)) {
3636 stringStream debug_stream;
3637
3638 // Class hierarchy info
3639 debug_stream.print(" klass: " INTPTR_FORMAT " super: " INTPTR_FORMAT,
3640 p2i(this), p2i(superklass()));
3641
3642 // Interfaces
3643 if (local_interfaces() != NULL && local_interfaces()->length() > 0) {
3644 debug_stream.print(" interfaces:");
3645 int length = local_interfaces()->length();
3646 for (int i = 0; i < length; i++) {
3647 debug_stream.print(" " INTPTR_FORMAT,
3648 p2i(InstanceKlass::cast(local_interfaces()->at(i))));
3649 }
3650 }
3651
3652 // Class loader
3653 debug_stream.print(" loader: [");
3654 loader_data->print_value_on(&debug_stream);
3655 debug_stream.print("]");
3656
3657 // Classfile checksum
3658 if (cfs) {
3659 debug_stream.print(" bytes: %d checksum: %08x",
3660 cfs->length(),
3661 ClassLoader::crc32(0, (const char*)cfs->buffer(),
3662 cfs->length()));
3663 }
3664
3665 msg.debug("%s", debug_stream.as_string());
3666 }
3667 }
3668
3669 // Verification
3670
3671 class VerifyFieldClosure: public BasicOopIterateClosure {
3672 protected:
3673 template <class T> void do_oop_work(T* p) {
3674 oop obj = RawAccess<>::oop_load(p);
3675 if (!oopDesc::is_oop_or_null(obj)) {
3676 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj));
3677 Universe::print_on(tty);
3678 guarantee(false, "boom");
3679 }
3680 }
3681 public:
3682 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); }
3683 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
3684 };
3685
3686 void InstanceKlass::verify_on(outputStream* st) {
3687 #ifndef PRODUCT
3688 // Avoid redundant verifies, this really should be in product.
3689 if (_verify_count == Universe::verify_count()) return;
3690 _verify_count = Universe::verify_count();
3691 #endif
3692
3693 // Verify Klass
3694 Klass::verify_on(st);
3695
3696 // Verify that klass is present in ClassLoaderData
3697 guarantee(class_loader_data()->contains_klass(this),
3698 "this class isn't found in class loader data");
3699
3700 // Verify vtables
3701 if (is_linked()) {
3702 // $$$ This used to be done only for m/s collections. Doing it
3703 // always seemed a valid generalization. (DLD -- 6/00)
3704 vtable().verify(st);
3705 }
3706
3707 // Verify first subklass
3708 if (subklass() != NULL) {
3709 guarantee(subklass()->is_klass(), "should be klass");
3710 }
3711
3712 // Verify siblings
3713 Klass* super = this->super();
3714 Klass* sib = next_sibling();
3715 if (sib != NULL) {
3716 if (sib == this) {
3717 fatal("subclass points to itself " PTR_FORMAT, p2i(sib));
3718 }
3719
3720 guarantee(sib->is_klass(), "should be klass");
3721 guarantee(sib->super() == super, "siblings should have same superklass");
3722 }
3723
3724 // Verify local interfaces
3725 if (local_interfaces()) {
3726 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
3727 for (int j = 0; j < local_interfaces->length(); j++) {
3728 InstanceKlass* e = local_interfaces->at(j);
3729 guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
3730 }
3731 }
3732
3733 // Verify transitive interfaces
3734 if (transitive_interfaces() != NULL) {
3735 Array<InstanceKlass*>* transitive_interfaces = this->transitive_interfaces();
3736 for (int j = 0; j < transitive_interfaces->length(); j++) {
3737 InstanceKlass* e = transitive_interfaces->at(j);
3738 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
3739 }
3740 }
3741
3742 // Verify methods
3743 if (methods() != NULL) {
3744 Array<Method*>* methods = this->methods();
3745 for (int j = 0; j < methods->length(); j++) {
3746 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3747 }
3748 for (int j = 0; j < methods->length() - 1; j++) {
3749 Method* m1 = methods->at(j);
3750 Method* m2 = methods->at(j + 1);
3751 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3752 }
3753 }
3754
3755 // Verify method ordering
3756 if (method_ordering() != NULL) {
3757 Array<int>* method_ordering = this->method_ordering();
3758 int length = method_ordering->length();
3759 if (JvmtiExport::can_maintain_original_method_order() ||
3760 ((UseSharedSpaces || Arguments::is_dumping_archive()) && length != 0)) {
3761 guarantee(length == methods()->length(), "invalid method ordering length");
3762 jlong sum = 0;
3763 for (int j = 0; j < length; j++) {
3764 int original_index = method_ordering->at(j);
3765 guarantee(original_index >= 0, "invalid method ordering index");
3766 guarantee(original_index < length, "invalid method ordering index");
3767 sum += original_index;
3768 }
3769 // Verify sum of indices 0,1,...,length-1
3770 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
3771 } else {
3772 guarantee(length == 0, "invalid method ordering length");
3773 }
3774 }
3775
3776 // Verify default methods
3777 if (default_methods() != NULL) {
3778 Array<Method*>* methods = this->default_methods();
3779 for (int j = 0; j < methods->length(); j++) {
3780 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3781 }
3782 for (int j = 0; j < methods->length() - 1; j++) {
3783 Method* m1 = methods->at(j);
3784 Method* m2 = methods->at(j + 1);
3785 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3786 }
3787 }
3788
3789 // Verify JNI static field identifiers
3790 if (jni_ids() != NULL) {
3791 jni_ids()->verify(this);
3792 }
3793
3794 // Verify other fields
3795 if (constants() != NULL) {
3796 guarantee(constants()->is_constantPool(), "should be constant pool");
3797 }
3798 const Klass* anonymous_host = unsafe_anonymous_host();
3799 if (anonymous_host != NULL) {
3800 guarantee(anonymous_host->is_klass(), "should be klass");
3801 }
3802 }
3803
3804 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
3805 Klass::oop_verify_on(obj, st);
3806 VerifyFieldClosure blk;
3807 obj->oop_iterate(&blk);
3808 }
3809
3810
3811 // JNIid class for jfieldIDs only
3812 // Note to reviewers:
3813 // These JNI functions are just moved over to column 1 and not changed
3814 // in the compressed oops workspace.
3815 JNIid::JNIid(Klass* holder, int offset, JNIid* next) {
3816 _holder = holder;
3817 _offset = offset;
3818 _next = next;
3819 debug_only(_is_static_field_id = false;)
3820 }
3821
3822
3823 JNIid* JNIid::find(int offset) {
3824 JNIid* current = this;
3825 while (current != NULL) {
3826 if (current->offset() == offset) return current;
3827 current = current->next();
3828 }
3829 return NULL;
3830 }
3831
3832 void JNIid::deallocate(JNIid* current) {
3833 while (current != NULL) {
3834 JNIid* next = current->next();
3835 delete current;
3836 current = next;
3837 }
3838 }
3839
3840
3841 void JNIid::verify(Klass* holder) {
3842 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields();
3843 int end_field_offset;
3844 end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize);
3845
3846 JNIid* current = this;
3847 while (current != NULL) {
3848 guarantee(current->holder() == holder, "Invalid klass in JNIid");
3849 #ifdef ASSERT
3850 int o = current->offset();
3851 if (current->is_static_field_id()) {
3852 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid");
3853 }
3854 #endif
3855 current = current->next();
3856 }
3857 }
3858
3859 void InstanceKlass::set_init_state(ClassState state) {
3860 #ifdef ASSERT
3861 bool good_state = is_shared() ? (_init_state <= state)
3862 : (_init_state < state);
3863 assert(good_state || state == allocated, "illegal state transition");
3864 #endif
3865 assert(_init_thread == NULL, "should be cleared before state change");
3866 _init_state = (u1)state;
3867 }
3868
3869 #if INCLUDE_JVMTI
3870
3871 // RedefineClasses() support for previous versions
3872
3873 // Globally, there is at least one previous version of a class to walk
3874 // during class unloading, which is saved because old methods in the class
3875 // are still running. Otherwise the previous version list is cleaned up.
3876 bool InstanceKlass::_has_previous_versions = false;
3877
3878 // Returns true if there are previous versions of a class for class
3879 // unloading only. Also resets the flag to false. purge_previous_version
3880 // will set the flag to true if there are any left, i.e., if there's any
3881 // work to do for next time. This is to avoid the expensive code cache
3882 // walk in CLDG::clean_deallocate_lists().
3883 bool InstanceKlass::has_previous_versions_and_reset() {
3884 bool ret = _has_previous_versions;
3885 log_trace(redefine, class, iklass, purge)("Class unloading: has_previous_versions = %s",
3886 ret ? "true" : "false");
3887 _has_previous_versions = false;
3888 return ret;
3889 }
3890
3891 // Purge previous versions before adding new previous versions of the class and
3892 // during class unloading.
3893 void InstanceKlass::purge_previous_version_list() {
3894 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
3895 assert(has_been_redefined(), "Should only be called for main class");
3896
3897 // Quick exit.
3898 if (previous_versions() == NULL) {
3899 return;
3900 }
3901
3902 // This klass has previous versions so see what we can cleanup
3903 // while it is safe to do so.
3904
3905 int deleted_count = 0; // leave debugging breadcrumbs
3906 int live_count = 0;
3907 ClassLoaderData* loader_data = class_loader_data();
3908 assert(loader_data != NULL, "should never be null");
3909
3910 ResourceMark rm;
3911 log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name());
3912
3913 // previous versions are linked together through the InstanceKlass
3914 InstanceKlass* pv_node = previous_versions();
3915 InstanceKlass* last = this;
3916 int version = 0;
3917
3918 // check the previous versions list
3919 for (; pv_node != NULL; ) {
3920
3921 ConstantPool* pvcp = pv_node->constants();
3922 assert(pvcp != NULL, "cp ref was unexpectedly cleared");
3923
3924 if (!pvcp->on_stack()) {
3925 // If the constant pool isn't on stack, none of the methods
3926 // are executing. Unlink this previous_version.
3927 // The previous version InstanceKlass is on the ClassLoaderData deallocate list
3928 // so will be deallocated during the next phase of class unloading.
3929 log_trace(redefine, class, iklass, purge)
3930 ("previous version " INTPTR_FORMAT " is dead.", p2i(pv_node));
3931 // For debugging purposes.
3932 pv_node->set_is_scratch_class();
3933 // Unlink from previous version list.
3934 assert(pv_node->class_loader_data() == loader_data, "wrong loader_data");
3935 InstanceKlass* next = pv_node->previous_versions();
3936 pv_node->link_previous_versions(NULL); // point next to NULL
3937 last->link_previous_versions(next);
3938 // Add to the deallocate list after unlinking
3939 loader_data->add_to_deallocate_list(pv_node);
3940 pv_node = next;
3941 deleted_count++;
3942 version++;
3943 continue;
3944 } else {
3945 log_trace(redefine, class, iklass, purge)("previous version " INTPTR_FORMAT " is alive", p2i(pv_node));
3946 assert(pvcp->pool_holder() != NULL, "Constant pool with no holder");
3947 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
3948 live_count++;
3949 // found a previous version for next time we do class unloading
3950 _has_previous_versions = true;
3951 }
3952
3953 // At least one method is live in this previous version.
3954 // Reset dead EMCP methods not to get breakpoints.
3955 // All methods are deallocated when all of the methods for this class are no
3956 // longer running.
3957 Array<Method*>* method_refs = pv_node->methods();
3958 if (method_refs != NULL) {
3959 log_trace(redefine, class, iklass, purge)("previous methods length=%d", method_refs->length());
3960 for (int j = 0; j < method_refs->length(); j++) {
3961 Method* method = method_refs->at(j);
3962
3963 if (!method->on_stack()) {
3964 // no breakpoints for non-running methods
3965 if (method->is_running_emcp()) {
3966 method->set_running_emcp(false);
3967 }
3968 } else {
3969 assert (method->is_obsolete() || method->is_running_emcp(),
3970 "emcp method cannot run after emcp bit is cleared");
3971 log_trace(redefine, class, iklass, purge)
3972 ("purge: %s(%s): prev method @%d in version @%d is alive",
3973 method->name()->as_C_string(), method->signature()->as_C_string(), j, version);
3974 }
3975 }
3976 }
3977 // next previous version
3978 last = pv_node;
3979 pv_node = pv_node->previous_versions();
3980 version++;
3981 }
3982 log_trace(redefine, class, iklass, purge)
3983 ("previous version stats: live=%d, deleted=%d", live_count, deleted_count);
3984 }
3985
3986 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods,
3987 int emcp_method_count) {
3988 int obsolete_method_count = old_methods->length() - emcp_method_count;
3989
3990 if (emcp_method_count != 0 && obsolete_method_count != 0 &&
3991 _previous_versions != NULL) {
3992 // We have a mix of obsolete and EMCP methods so we have to
3993 // clear out any matching EMCP method entries the hard way.
3994 int local_count = 0;
3995 for (int i = 0; i < old_methods->length(); i++) {
3996 Method* old_method = old_methods->at(i);
3997 if (old_method->is_obsolete()) {
3998 // only obsolete methods are interesting
3999 Symbol* m_name = old_method->name();
4000 Symbol* m_signature = old_method->signature();
4001
4002 // previous versions are linked together through the InstanceKlass
4003 int j = 0;
4004 for (InstanceKlass* prev_version = _previous_versions;
4005 prev_version != NULL;
4006 prev_version = prev_version->previous_versions(), j++) {
4007
4008 Array<Method*>* method_refs = prev_version->methods();
4009 for (int k = 0; k < method_refs->length(); k++) {
4010 Method* method = method_refs->at(k);
4011
4012 if (!method->is_obsolete() &&
4013 method->name() == m_name &&
4014 method->signature() == m_signature) {
4015 // The current RedefineClasses() call has made all EMCP
4016 // versions of this method obsolete so mark it as obsolete
4017 log_trace(redefine, class, iklass, add)
4018 ("%s(%s): flush obsolete method @%d in version @%d",
4019 m_name->as_C_string(), m_signature->as_C_string(), k, j);
4020
4021 method->set_is_obsolete();
4022 break;
4023 }
4024 }
4025
4026 // The previous loop may not find a matching EMCP method, but
4027 // that doesn't mean that we can optimize and not go any
4028 // further back in the PreviousVersion generations. The EMCP
4029 // method for this generation could have already been made obsolete,
4030 // but there still may be an older EMCP method that has not
4031 // been made obsolete.
4032 }
4033
4034 if (++local_count >= obsolete_method_count) {
4035 // no more obsolete methods so bail out now
4036 break;
4037 }
4038 }
4039 }
4040 }
4041 }
4042
4043 // Save the scratch_class as the previous version if any of the methods are running.
4044 // The previous_versions are used to set breakpoints in EMCP methods and they are
4045 // also used to clean MethodData links to redefined methods that are no longer running.
4046 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class,
4047 int emcp_method_count) {
4048 assert(Thread::current()->is_VM_thread(),
4049 "only VMThread can add previous versions");
4050
4051 ResourceMark rm;
4052 log_trace(redefine, class, iklass, add)
4053 ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count);
4054
4055 // Clean out old previous versions for this class
4056 purge_previous_version_list();
4057
4058 // Mark newly obsolete methods in remaining previous versions. An EMCP method from
4059 // a previous redefinition may be made obsolete by this redefinition.
4060 Array<Method*>* old_methods = scratch_class->methods();
4061 mark_newly_obsolete_methods(old_methods, emcp_method_count);
4062
4063 // If the constant pool for this previous version of the class
4064 // is not marked as being on the stack, then none of the methods
4065 // in this previous version of the class are on the stack so
4066 // we don't need to add this as a previous version.
4067 ConstantPool* cp_ref = scratch_class->constants();
4068 if (!cp_ref->on_stack()) {
4069 log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running");
4070 // For debugging purposes.
4071 scratch_class->set_is_scratch_class();
4072 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class);
4073 return;
4074 }
4075
4076 if (emcp_method_count != 0) {
4077 // At least one method is still running, check for EMCP methods
4078 for (int i = 0; i < old_methods->length(); i++) {
4079 Method* old_method = old_methods->at(i);
4080 if (!old_method->is_obsolete() && old_method->on_stack()) {
4081 // if EMCP method (not obsolete) is on the stack, mark as EMCP so that
4082 // we can add breakpoints for it.
4083
4084 // We set the method->on_stack bit during safepoints for class redefinition
4085 // and use this bit to set the is_running_emcp bit.
4086 // After the safepoint, the on_stack bit is cleared and the running emcp
4087 // method may exit. If so, we would set a breakpoint in a method that
4088 // is never reached, but this won't be noticeable to the programmer.
4089 old_method->set_running_emcp(true);
4090 log_trace(redefine, class, iklass, add)
4091 ("EMCP method %s is on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
4092 } else if (!old_method->is_obsolete()) {
4093 log_trace(redefine, class, iklass, add)
4094 ("EMCP method %s is NOT on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
4095 }
4096 }
4097 }
4098
4099 // Add previous version if any methods are still running.
4100 // Set has_previous_version flag for processing during class unloading.
4101 _has_previous_versions = true;
4102 log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack.");
4103 assert(scratch_class->previous_versions() == NULL, "shouldn't have a previous version");
4104 scratch_class->link_previous_versions(previous_versions());
4105 link_previous_versions(scratch_class);
4106 } // end add_previous_version()
4107
4108 #endif // INCLUDE_JVMTI
4109
4110 Method* InstanceKlass::method_with_idnum(int idnum) {
4111 Method* m = NULL;
4112 if (idnum < methods()->length()) {
4113 m = methods()->at(idnum);
4114 }
4115 if (m == NULL || m->method_idnum() != idnum) {
4116 for (int index = 0; index < methods()->length(); ++index) {
4117 m = methods()->at(index);
4118 if (m->method_idnum() == idnum) {
4119 return m;
4120 }
4121 }
4122 // None found, return null for the caller to handle.
4123 return NULL;
4124 }
4125 return m;
4126 }
4127
4128
4129 Method* InstanceKlass::method_with_orig_idnum(int idnum) {
4130 if (idnum >= methods()->length()) {
4131 return NULL;
4132 }
4133 Method* m = methods()->at(idnum);
4134 if (m != NULL && m->orig_method_idnum() == idnum) {
4135 return m;
4136 }
4137 // Obsolete method idnum does not match the original idnum
4138 for (int index = 0; index < methods()->length(); ++index) {
4139 m = methods()->at(index);
4140 if (m->orig_method_idnum() == idnum) {
4141 return m;
4142 }
4143 }
4144 // None found, return null for the caller to handle.
4145 return NULL;
4146 }
4147
4148
4149 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) {
4150 InstanceKlass* holder = get_klass_version(version);
4151 if (holder == NULL) {
4152 return NULL; // The version of klass is gone, no method is found
4153 }
4154 Method* method = holder->method_with_orig_idnum(idnum);
4155 return method;
4156 }
4157
4158 #if INCLUDE_JVMTI
4159 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() {
4160 return _cached_class_file;
4161 }
4162
4163 jint InstanceKlass::get_cached_class_file_len() {
4164 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
4165 }
4166
4167 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
4168 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
4169 }
4170 #endif