1 /*
2 * Copyright (c) 1997, 2018, 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/systemDictionary.hpp"
35 #include "classfile/systemDictionaryShared.hpp"
36 #include "classfile/verifier.hpp"
37 #include "classfile/vmSymbols.hpp"
38 #include "code/dependencyContext.hpp"
39 #include "compiler/compileBroker.hpp"
40 #include "gc/shared/collectedHeap.inline.hpp"
41 #include "gc/shared/specialized_oop_closures.hpp"
42 #include "interpreter/oopMapCache.hpp"
43 #include "interpreter/rewriter.hpp"
44 #include "jvmtifiles/jvmti.h"
45 #include "logging/log.hpp"
46 #include "logging/logMessage.hpp"
47 #include "logging/logStream.hpp"
48 #include "memory/allocation.inline.hpp"
49 #include "memory/heapInspection.hpp"
50 #include "memory/iterator.inline.hpp"
51 #include "memory/metadataFactory.hpp"
52 #include "memory/metaspaceClosure.hpp"
53 #include "memory/metaspaceShared.hpp"
54 #include "memory/oopFactory.hpp"
55 #include "memory/resourceArea.hpp"
56 #include "oops/fieldStreams.hpp"
57 #include "oops/instanceClassLoaderKlass.hpp"
58 #include "oops/instanceKlass.inline.hpp"
59 #include "oops/instanceMirrorKlass.hpp"
60 #include "oops/instanceOop.hpp"
61 #include "oops/klass.inline.hpp"
62 #include "oops/method.hpp"
63 #include "oops/oop.inline.hpp"
64 #include "oops/symbol.hpp"
65 #include "prims/jvmtiExport.hpp"
66 #include "prims/jvmtiRedefineClasses.hpp"
67 #include "prims/jvmtiThreadState.hpp"
68 #include "prims/methodComparator.hpp"
69 #include "runtime/atomic.hpp"
70 #include "runtime/fieldDescriptor.hpp"
71 #include "runtime/handles.inline.hpp"
72 #include "runtime/javaCalls.hpp"
73 #include "runtime/mutexLocker.hpp"
74 #include "runtime/orderAccess.inline.hpp"
75 #include "runtime/thread.inline.hpp"
76 #include "services/classLoadingService.hpp"
77 #include "services/threadService.hpp"
78 #include "utilities/dtrace.hpp"
79 #include "utilities/macros.hpp"
80 #include "utilities/stringUtils.hpp"
81 #ifdef COMPILER1
82 #include "c1/c1_Compiler.hpp"
83 #endif
84
85 #ifdef DTRACE_ENABLED
86
87
88 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED
89 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE
90 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT
91 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS
92 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED
93 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT
94 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR
95 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END
96 #define DTRACE_CLASSINIT_PROBE(type, thread_type) \
97 { \
98 char* data = NULL; \
99 int len = 0; \
100 Symbol* clss_name = name(); \
101 if (clss_name != NULL) { \
102 data = (char*)clss_name->bytes(); \
103 len = clss_name->utf8_length(); \
104 } \
105 HOTSPOT_CLASS_INITIALIZATION_##type( \
106 data, len, (void*)class_loader(), thread_type); \
107 }
108
109 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) \
110 { \
111 char* data = NULL; \
112 int len = 0; \
113 Symbol* clss_name = name(); \
114 if (clss_name != NULL) { \
115 data = (char*)clss_name->bytes(); \
116 len = clss_name->utf8_length(); \
117 } \
118 HOTSPOT_CLASS_INITIALIZATION_##type( \
119 data, len, (void*)class_loader(), thread_type, wait); \
120 }
121
122 #else // ndef DTRACE_ENABLED
123
124 #define DTRACE_CLASSINIT_PROBE(type, thread_type)
125 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait)
126
127 #endif // ndef DTRACE_ENABLED
128
129 static inline bool is_class_loader(const Symbol* class_name,
130 const ClassFileParser& parser) {
131 assert(class_name != NULL, "invariant");
132
133 if (class_name == vmSymbols::java_lang_ClassLoader()) {
134 return true;
135 }
136
137 if (SystemDictionary::ClassLoader_klass_loaded()) {
138 const Klass* const super_klass = parser.super_klass();
139 if (super_klass != NULL) {
140 if (super_klass->is_subtype_of(SystemDictionary::ClassLoader_klass())) {
141 return true;
142 }
143 }
144 }
145 return false;
146 }
147
148 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) {
149 const int size = InstanceKlass::size(parser.vtable_size(),
150 parser.itable_size(),
151 nonstatic_oop_map_size(parser.total_oop_map_count()),
152 parser.is_interface(),
153 parser.is_anonymous(),
154 should_store_fingerprint(parser.is_anonymous()));
155
156 const Symbol* const class_name = parser.class_name();
157 assert(class_name != NULL, "invariant");
158 ClassLoaderData* loader_data = parser.loader_data();
159 assert(loader_data != NULL, "invariant");
160
161 InstanceKlass* ik;
162
163 // Allocation
164 if (REF_NONE == parser.reference_type()) {
165 if (class_name == vmSymbols::java_lang_Class()) {
166 // mirror
167 ik = new (loader_data, size, THREAD) InstanceMirrorKlass(parser);
168 }
169 else if (is_class_loader(class_name, parser)) {
170 // class loader
171 ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser);
172 }
173 else {
174 // normal
175 ik = new (loader_data, size, THREAD) InstanceKlass(parser, InstanceKlass::_misc_kind_other);
176 }
177 }
178 else {
179 // reference
180 ik = new (loader_data, size, THREAD) InstanceRefKlass(parser);
181 }
182
183 // Check for pending exception before adding to the loader data and incrementing
184 // class count. Can get OOM here.
185 if (HAS_PENDING_EXCEPTION) {
186 return NULL;
187 }
188
189 return ik;
190 }
191
192
193 // copy method ordering from resource area to Metaspace
194 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) {
195 if (m != NULL) {
196 // allocate a new array and copy contents (memcpy?)
197 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
198 for (int i = 0; i < m->length(); i++) {
199 _method_ordering->at_put(i, m->at(i));
200 }
201 } else {
202 _method_ordering = Universe::the_empty_int_array();
203 }
204 }
205
206 // create a new array of vtable_indices for default methods
207 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
208 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
209 assert(default_vtable_indices() == NULL, "only create once");
210 set_default_vtable_indices(vtable_indices);
211 return vtable_indices;
212 }
213
214 InstanceKlass::InstanceKlass(const ClassFileParser& parser, unsigned kind) :
215 _static_field_size(parser.static_field_size()),
216 _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())),
217 _itable_len(parser.itable_size()),
218 _reference_type(parser.reference_type()) {
219 set_vtable_length(parser.vtable_size());
220 set_kind(kind);
221 set_access_flags(parser.access_flags());
222 set_is_anonymous(parser.is_anonymous());
223 set_layout_helper(Klass::instance_layout_helper(parser.layout_size(),
224 false));
225
226 assert(NULL == _methods, "underlying memory not zeroed?");
227 assert(is_instance_klass(), "is layout incorrect?");
228 assert(size_helper() == parser.layout_size(), "incorrect size_helper?");
229 }
230
231 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
232 Array<Method*>* methods) {
233 if (methods != NULL && methods != Universe::the_empty_method_array() &&
234 !methods->is_shared()) {
235 for (int i = 0; i < methods->length(); i++) {
236 Method* method = methods->at(i);
237 if (method == NULL) continue; // maybe null if error processing
238 // Only want to delete methods that are not executing for RedefineClasses.
239 // The previous version will point to them so they're not totally dangling
240 assert (!method->on_stack(), "shouldn't be called with methods on stack");
241 MetadataFactory::free_metadata(loader_data, method);
242 }
243 MetadataFactory::free_array<Method*>(loader_data, methods);
244 }
245 }
246
247 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
248 const Klass* super_klass,
249 Array<Klass*>* local_interfaces,
250 Array<Klass*>* transitive_interfaces) {
251 // Only deallocate transitive interfaces if not empty, same as super class
252 // or same as local interfaces. See code in parseClassFile.
253 Array<Klass*>* ti = transitive_interfaces;
254 if (ti != Universe::the_empty_klass_array() && ti != local_interfaces) {
255 // check that the interfaces don't come from super class
256 Array<Klass*>* sti = (super_klass == NULL) ? NULL :
257 InstanceKlass::cast(super_klass)->transitive_interfaces();
258 if (ti != sti && ti != NULL && !ti->is_shared()) {
259 MetadataFactory::free_array<Klass*>(loader_data, ti);
260 }
261 }
262
263 // local interfaces can be empty
264 if (local_interfaces != Universe::the_empty_klass_array() &&
265 local_interfaces != NULL && !local_interfaces->is_shared()) {
266 MetadataFactory::free_array<Klass*>(loader_data, local_interfaces);
267 }
268 }
269
270 // This function deallocates the metadata and C heap pointers that the
271 // InstanceKlass points to.
272 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
273
274 // Orphan the mirror first, CMS thinks it's still live.
275 if (java_mirror() != NULL) {
276 java_lang_Class::set_klass(java_mirror(), NULL);
277 }
278
279 // Also remove mirror from handles
280 loader_data->remove_handle(_java_mirror);
281
282 // Need to take this class off the class loader data list.
283 loader_data->remove_class(this);
284
285 // The array_klass for this class is created later, after error handling.
286 // For class redefinition, we keep the original class so this scratch class
287 // doesn't have an array class. Either way, assert that there is nothing
288 // to deallocate.
289 assert(array_klasses() == NULL, "array classes shouldn't be created for this class yet");
290
291 // Release C heap allocated data that this might point to, which includes
292 // reference counting symbol names.
293 release_C_heap_structures();
294
295 deallocate_methods(loader_data, methods());
296 set_methods(NULL);
297
298 if (method_ordering() != NULL &&
299 method_ordering() != Universe::the_empty_int_array() &&
300 !method_ordering()->is_shared()) {
301 MetadataFactory::free_array<int>(loader_data, method_ordering());
302 }
303 set_method_ordering(NULL);
304
305 // default methods can be empty
306 if (default_methods() != NULL &&
307 default_methods() != Universe::the_empty_method_array() &&
308 !default_methods()->is_shared()) {
309 MetadataFactory::free_array<Method*>(loader_data, default_methods());
310 }
311 // Do NOT deallocate the default methods, they are owned by superinterfaces.
312 set_default_methods(NULL);
313
314 // default methods vtable indices can be empty
315 if (default_vtable_indices() != NULL &&
316 !default_vtable_indices()->is_shared()) {
317 MetadataFactory::free_array<int>(loader_data, default_vtable_indices());
318 }
319 set_default_vtable_indices(NULL);
320
321
322 // This array is in Klass, but remove it with the InstanceKlass since
323 // this place would be the only caller and it can share memory with transitive
324 // interfaces.
325 if (secondary_supers() != NULL &&
326 secondary_supers() != Universe::the_empty_klass_array() &&
327 secondary_supers() != transitive_interfaces() &&
328 !secondary_supers()->is_shared()) {
329 MetadataFactory::free_array<Klass*>(loader_data, secondary_supers());
330 }
331 set_secondary_supers(NULL);
332
333 deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces());
334 set_transitive_interfaces(NULL);
335 set_local_interfaces(NULL);
336
337 if (fields() != NULL && !fields()->is_shared()) {
338 MetadataFactory::free_array<jushort>(loader_data, fields());
339 }
340 set_fields(NULL, 0);
341
342 // If a method from a redefined class is using this constant pool, don't
343 // delete it, yet. The new class's previous version will point to this.
344 if (constants() != NULL) {
345 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack");
346 if (!constants()->is_shared()) {
347 MetadataFactory::free_metadata(loader_data, constants());
348 }
349 // Delete any cached resolution errors for the constant pool
350 SystemDictionary::delete_resolution_error(constants());
351
352 set_constants(NULL);
353 }
354
355 if (inner_classes() != NULL &&
356 inner_classes() != Universe::the_empty_short_array() &&
357 !inner_classes()->is_shared()) {
358 MetadataFactory::free_array<jushort>(loader_data, inner_classes());
359 }
360 set_inner_classes(NULL);
361
362 // We should deallocate the Annotations instance if it's not in shared spaces.
363 if (annotations() != NULL && !annotations()->is_shared()) {
364 MetadataFactory::free_metadata(loader_data, annotations());
365 }
366 set_annotations(NULL);
367 }
368
369 bool InstanceKlass::should_be_initialized() const {
370 return !is_initialized();
371 }
372
373 klassItable InstanceKlass::itable() const {
374 return klassItable(const_cast<InstanceKlass*>(this));
375 }
376
377 void InstanceKlass::eager_initialize(Thread *thread) {
378 if (!EagerInitialization) return;
379
380 if (this->is_not_initialized()) {
381 // abort if the the class has a class initializer
382 if (this->class_initializer() != NULL) return;
383
384 // abort if it is java.lang.Object (initialization is handled in genesis)
385 Klass* super_klass = super();
386 if (super_klass == NULL) return;
387
388 // abort if the super class should be initialized
389 if (!InstanceKlass::cast(super_klass)->is_initialized()) return;
390
391 // call body to expose the this pointer
392 eager_initialize_impl();
393 }
394 }
395
396 // JVMTI spec thinks there are signers and protection domain in the
397 // instanceKlass. These accessors pretend these fields are there.
398 // The hprof specification also thinks these fields are in InstanceKlass.
399 oop InstanceKlass::protection_domain() const {
400 // return the protection_domain from the mirror
401 return java_lang_Class::protection_domain(java_mirror());
402 }
403
404 // To remove these from requires an incompatible change and CCC request.
405 objArrayOop InstanceKlass::signers() const {
406 // return the signers from the mirror
407 return java_lang_Class::signers(java_mirror());
408 }
409
410 oop InstanceKlass::init_lock() const {
411 // return the init lock from the mirror
412 oop lock = java_lang_Class::init_lock(java_mirror());
413 // Prevent reordering with any access of initialization state
414 OrderAccess::loadload();
415 assert((oop)lock != NULL || !is_not_initialized(), // initialized or in_error state
416 "only fully initialized state can have a null lock");
417 return lock;
418 }
419
420 // Set the initialization lock to null so the object can be GC'ed. Any racing
421 // threads to get this lock will see a null lock and will not lock.
422 // That's okay because they all check for initialized state after getting
423 // the lock and return.
424 void InstanceKlass::fence_and_clear_init_lock() {
425 // make sure previous stores are all done, notably the init_state.
426 OrderAccess::storestore();
427 java_lang_Class::set_init_lock(java_mirror(), NULL);
428 assert(!is_not_initialized(), "class must be initialized now");
429 }
430
431 void InstanceKlass::eager_initialize_impl() {
432 EXCEPTION_MARK;
433 HandleMark hm(THREAD);
434 Handle h_init_lock(THREAD, init_lock());
435 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
436
437 // abort if someone beat us to the initialization
438 if (!is_not_initialized()) return; // note: not equivalent to is_initialized()
439
440 ClassState old_state = init_state();
441 link_class_impl(true, THREAD);
442 if (HAS_PENDING_EXCEPTION) {
443 CLEAR_PENDING_EXCEPTION;
444 // Abort if linking the class throws an exception.
445
446 // Use a test to avoid redundantly resetting the state if there's
447 // no change. Set_init_state() asserts that state changes make
448 // progress, whereas here we might just be spinning in place.
449 if (old_state != _init_state)
450 set_init_state(old_state);
451 } else {
452 // linking successfull, mark class as initialized
453 set_init_state(fully_initialized);
454 fence_and_clear_init_lock();
455 // trace
456 if (log_is_enabled(Info, class, init)) {
457 ResourceMark rm(THREAD);
458 log_info(class, init)("[Initialized %s without side effects]", external_name());
459 }
460 }
461 }
462
463
464 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization
465 // process. The step comments refers to the procedure described in that section.
466 // Note: implementation moved to static method to expose the this pointer.
467 void InstanceKlass::initialize(TRAPS) {
468 if (this->should_be_initialized()) {
469 initialize_impl(CHECK);
470 // Note: at this point the class may be initialized
471 // OR it may be in the state of being initialized
472 // in case of recursive initialization!
473 } else {
474 assert(is_initialized(), "sanity check");
475 }
476 }
477
478
479 bool InstanceKlass::verify_code(bool throw_verifyerror, TRAPS) {
480 // 1) Verify the bytecodes
481 Verifier::Mode mode =
482 throw_verifyerror ? Verifier::ThrowException : Verifier::NoException;
483 return Verifier::verify(this, mode, should_verify_class(), THREAD);
484 }
485
486
487 // Used exclusively by the shared spaces dump mechanism to prevent
488 // classes mapped into the shared regions in new VMs from appearing linked.
489
490 void InstanceKlass::unlink_class() {
491 assert(is_linked(), "must be linked");
492 _init_state = loaded;
493 }
494
495 void InstanceKlass::link_class(TRAPS) {
496 assert(is_loaded(), "must be loaded");
497 if (!is_linked()) {
498 link_class_impl(true, CHECK);
499 }
500 }
501
502 // Called to verify that a class can link during initialization, without
503 // throwing a VerifyError.
504 bool InstanceKlass::link_class_or_fail(TRAPS) {
505 assert(is_loaded(), "must be loaded");
506 if (!is_linked()) {
507 link_class_impl(false, CHECK_false);
508 }
509 return is_linked();
510 }
511
512 bool InstanceKlass::link_class_impl(bool throw_verifyerror, TRAPS) {
513 if (DumpSharedSpaces && is_in_error_state()) {
514 // This is for CDS dumping phase only -- we use the in_error_state to indicate that
515 // the class has failed verification. Throwing the NoClassDefFoundError here is just
516 // a convenient way to stop repeat attempts to verify the same (bad) class.
517 //
518 // Note that the NoClassDefFoundError is not part of the JLS, and should not be thrown
519 // if we are executing Java code. This is not a problem for CDS dumping phase since
520 // it doesn't execute any Java code.
521 ResourceMark rm(THREAD);
522 Exceptions::fthrow(THREAD_AND_LOCATION,
523 vmSymbols::java_lang_NoClassDefFoundError(),
524 "Class %s, or one of its supertypes, failed class initialization",
525 external_name());
526 return false;
527 }
528 // return if already verified
529 if (is_linked()) {
530 return true;
531 }
532
533 // Timing
534 // timer handles recursion
535 assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl");
536 JavaThread* jt = (JavaThread*)THREAD;
537
538 // link super class before linking this class
539 Klass* super_klass = super();
540 if (super_klass != NULL) {
541 if (super_klass->is_interface()) { // check if super class is an interface
542 ResourceMark rm(THREAD);
543 Exceptions::fthrow(
544 THREAD_AND_LOCATION,
545 vmSymbols::java_lang_IncompatibleClassChangeError(),
546 "class %s has interface %s as super class",
547 external_name(),
548 super_klass->external_name()
549 );
550 return false;
551 }
552
553 InstanceKlass* ik_super = InstanceKlass::cast(super_klass);
554 ik_super->link_class_impl(throw_verifyerror, CHECK_false);
555 }
556
557 // link all interfaces implemented by this class before linking this class
558 Array<Klass*>* interfaces = local_interfaces();
559 int num_interfaces = interfaces->length();
560 for (int index = 0; index < num_interfaces; index++) {
561 InstanceKlass* interk = InstanceKlass::cast(interfaces->at(index));
562 interk->link_class_impl(throw_verifyerror, CHECK_false);
563 }
564
565 // in case the class is linked in the process of linking its superclasses
566 if (is_linked()) {
567 return true;
568 }
569
570 // trace only the link time for this klass that includes
571 // the verification time
572 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
573 ClassLoader::perf_class_link_selftime(),
574 ClassLoader::perf_classes_linked(),
575 jt->get_thread_stat()->perf_recursion_counts_addr(),
576 jt->get_thread_stat()->perf_timers_addr(),
577 PerfClassTraceTime::CLASS_LINK);
578
579 // verification & rewriting
580 {
581 HandleMark hm(THREAD);
582 Handle h_init_lock(THREAD, init_lock());
583 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
584 // rewritten will have been set if loader constraint error found
585 // on an earlier link attempt
586 // don't verify or rewrite if already rewritten
587 //
588
589 if (!is_linked()) {
590 if (!is_rewritten()) {
591 {
592 bool verify_ok = verify_code(throw_verifyerror, THREAD);
593 if (!verify_ok) {
594 return false;
595 }
596 }
597
598 // Just in case a side-effect of verify linked this class already
599 // (which can sometimes happen since the verifier loads classes
600 // using custom class loaders, which are free to initialize things)
601 if (is_linked()) {
602 return true;
603 }
604
605 // also sets rewritten
606 rewrite_class(CHECK_false);
607 } else if (is_shared()) {
608 SystemDictionaryShared::check_verification_constraints(this, CHECK_false);
609 }
610
611 // relocate jsrs and link methods after they are all rewritten
612 link_methods(CHECK_false);
613
614 // Initialize the vtable and interface table after
615 // methods have been rewritten since rewrite may
616 // fabricate new Method*s.
617 // also does loader constraint checking
618 //
619 // initialize_vtable and initialize_itable need to be rerun for
620 // a shared class if the class is not loaded by the NULL classloader.
621 ClassLoaderData * loader_data = class_loader_data();
622 if (!(is_shared() &&
623 loader_data->is_the_null_class_loader_data())) {
624 ResourceMark rm(THREAD);
625 vtable().initialize_vtable(true, CHECK_false);
626 itable().initialize_itable(true, CHECK_false);
627 }
628 #ifdef ASSERT
629 else {
630 vtable().verify(tty, true);
631 // In case itable verification is ever added.
632 // itable().verify(tty, true);
633 }
634 #endif
635 set_init_state(linked);
636 if (JvmtiExport::should_post_class_prepare()) {
637 Thread *thread = THREAD;
638 assert(thread->is_Java_thread(), "thread->is_Java_thread()");
639 JvmtiExport::post_class_prepare((JavaThread *) thread, this);
640 }
641 }
642 }
643 return true;
644 }
645
646
647 // Rewrite the byte codes of all of the methods of a class.
648 // The rewriter must be called exactly once. Rewriting must happen after
649 // verification but before the first method of the class is executed.
650 void InstanceKlass::rewrite_class(TRAPS) {
651 assert(is_loaded(), "must be loaded");
652 if (is_rewritten()) {
653 assert(is_shared(), "rewriting an unshared class?");
654 return;
655 }
656 Rewriter::rewrite(this, CHECK);
657 set_rewritten();
658 }
659
660 // Now relocate and link method entry points after class is rewritten.
661 // This is outside is_rewritten flag. In case of an exception, it can be
662 // executed more than once.
663 void InstanceKlass::link_methods(TRAPS) {
664 int len = methods()->length();
665 for (int i = len-1; i >= 0; i--) {
666 methodHandle m(THREAD, methods()->at(i));
667
668 // Set up method entry points for compiler and interpreter .
669 m->link_method(m, CHECK);
670 }
671 }
672
673 // Eagerly initialize superinterfaces that declare default methods (concrete instance: any access)
674 void InstanceKlass::initialize_super_interfaces(TRAPS) {
675 assert (has_nonstatic_concrete_methods(), "caller should have checked this");
676 for (int i = 0; i < local_interfaces()->length(); ++i) {
677 Klass* iface = local_interfaces()->at(i);
678 InstanceKlass* ik = InstanceKlass::cast(iface);
679
680 // Initialization is depth first search ie. we start with top of the inheritance tree
681 // has_nonstatic_concrete_methods drives searching superinterfaces since it
682 // means has_nonstatic_concrete_methods in its superinterface hierarchy
683 if (ik->has_nonstatic_concrete_methods()) {
684 ik->initialize_super_interfaces(CHECK);
685 }
686
687 // Only initialize() interfaces that "declare" concrete methods.
688 if (ik->should_be_initialized() && ik->declares_nonstatic_concrete_methods()) {
689 ik->initialize(CHECK);
690 }
691 }
692 }
693
694 void InstanceKlass::initialize_impl(TRAPS) {
695 HandleMark hm(THREAD);
696
697 // Make sure klass is linked (verified) before initialization
698 // A class could already be verified, since it has been reflected upon.
699 link_class(CHECK);
700
701 DTRACE_CLASSINIT_PROBE(required, -1);
702
703 bool wait = false;
704
705 // refer to the JVM book page 47 for description of steps
706 // Step 1
707 {
708 Handle h_init_lock(THREAD, init_lock());
709 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
710
711 Thread *self = THREAD; // it's passed the current thread
712
713 // Step 2
714 // If we were to use wait() instead of waitInterruptibly() then
715 // we might end up throwing IE from link/symbol resolution sites
716 // that aren't expected to throw. This would wreak havoc. See 6320309.
717 while(is_being_initialized() && !is_reentrant_initialization(self)) {
718 wait = true;
719 ol.waitUninterruptibly(CHECK);
720 }
721
722 // Step 3
723 if (is_being_initialized() && is_reentrant_initialization(self)) {
724 DTRACE_CLASSINIT_PROBE_WAIT(recursive, -1, wait);
725 return;
726 }
727
728 // Step 4
729 if (is_initialized()) {
730 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, -1, wait);
731 return;
732 }
733
734 // Step 5
735 if (is_in_error_state()) {
736 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait);
737 ResourceMark rm(THREAD);
738 const char* desc = "Could not initialize class ";
739 const char* className = external_name();
740 size_t msglen = strlen(desc) + strlen(className) + 1;
741 char* message = NEW_RESOURCE_ARRAY(char, msglen);
742 if (NULL == message) {
743 // Out of memory: can't create detailed error message
744 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className);
745 } else {
746 jio_snprintf(message, msglen, "%s%s", desc, className);
747 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message);
748 }
749 }
750
751 // Step 6
752 set_init_state(being_initialized);
753 set_init_thread(self);
754 }
755
756 // Step 7
757 // Next, if C is a class rather than an interface, initialize it's super class and super
758 // interfaces.
759 if (!is_interface()) {
760 Klass* super_klass = super();
761 if (super_klass != NULL && super_klass->should_be_initialized()) {
762 super_klass->initialize(THREAD);
763 }
764 // If C implements any interface that declares a non-static, concrete method,
765 // the initialization of C triggers initialization of its super interfaces.
766 // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and
767 // having a superinterface that declares, non-static, concrete methods
768 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) {
769 initialize_super_interfaces(THREAD);
770 }
771
772 // If any exceptions, complete abruptly, throwing the same exception as above.
773 if (HAS_PENDING_EXCEPTION) {
774 Handle e(THREAD, PENDING_EXCEPTION);
775 CLEAR_PENDING_EXCEPTION;
776 {
777 EXCEPTION_MARK;
778 // Locks object, set state, and notify all waiting threads
779 set_initialization_state_and_notify(initialization_error, THREAD);
780 CLEAR_PENDING_EXCEPTION;
781 }
782 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait);
783 THROW_OOP(e());
784 }
785 }
786
787
788 // Look for aot compiled methods for this klass, including class initializer.
789 AOTLoader::load_for_klass(this, THREAD);
790
791 // Step 8
792 {
793 assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl");
794 JavaThread* jt = (JavaThread*)THREAD;
795 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
796 // Timer includes any side effects of class initialization (resolution,
797 // etc), but not recursive entry into call_class_initializer().
798 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
799 ClassLoader::perf_class_init_selftime(),
800 ClassLoader::perf_classes_inited(),
801 jt->get_thread_stat()->perf_recursion_counts_addr(),
802 jt->get_thread_stat()->perf_timers_addr(),
803 PerfClassTraceTime::CLASS_CLINIT);
804 call_class_initializer(THREAD);
805 }
806
807 // Step 9
808 if (!HAS_PENDING_EXCEPTION) {
809 set_initialization_state_and_notify(fully_initialized, CHECK);
810 {
811 debug_only(vtable().verify(tty, true);)
812 }
813 }
814 else {
815 // Step 10 and 11
816 Handle e(THREAD, PENDING_EXCEPTION);
817 CLEAR_PENDING_EXCEPTION;
818 // JVMTI has already reported the pending exception
819 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
820 JvmtiExport::clear_detected_exception((JavaThread*)THREAD);
821 {
822 EXCEPTION_MARK;
823 set_initialization_state_and_notify(initialization_error, THREAD);
824 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below
825 // JVMTI has already reported the pending exception
826 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
827 JvmtiExport::clear_detected_exception((JavaThread*)THREAD);
828 }
829 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
830 if (e->is_a(SystemDictionary::Error_klass())) {
831 THROW_OOP(e());
832 } else {
833 JavaCallArguments args(e);
834 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
835 vmSymbols::throwable_void_signature(),
836 &args);
837 }
838 }
839 DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait);
840 }
841
842
843 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) {
844 Handle h_init_lock(THREAD, init_lock());
845 if (h_init_lock() != NULL) {
846 ObjectLocker ol(h_init_lock, THREAD);
847 set_init_state(state);
848 fence_and_clear_init_lock();
849 ol.notify_all(CHECK);
850 } else {
851 assert(h_init_lock() != NULL, "The initialization state should never be set twice");
852 set_init_state(state);
853 }
854 }
855
856 // The embedded _implementor field can only record one implementor.
857 // When there are more than one implementors, the _implementor field
858 // is set to the interface Klass* itself. Following are the possible
859 // values for the _implementor field:
860 // NULL - no implementor
861 // implementor Klass* - one implementor
862 // self - more than one implementor
863 //
864 // The _implementor field only exists for interfaces.
865 void InstanceKlass::add_implementor(Klass* k) {
866 assert(Compile_lock->owned_by_self(), "");
867 assert(is_interface(), "not interface");
868 // Filter out my subinterfaces.
869 // (Note: Interfaces are never on the subklass list.)
870 if (InstanceKlass::cast(k)->is_interface()) return;
871
872 // Filter out subclasses whose supers already implement me.
873 // (Note: CHA must walk subclasses of direct implementors
874 // in order to locate indirect implementors.)
875 Klass* sk = k->super();
876 if (sk != NULL && InstanceKlass::cast(sk)->implements_interface(this))
877 // We only need to check one immediate superclass, since the
878 // implements_interface query looks at transitive_interfaces.
879 // Any supers of the super have the same (or fewer) transitive_interfaces.
880 return;
881
882 Klass* ik = implementor();
883 if (ik == NULL) {
884 set_implementor(k);
885 } else if (ik != this) {
886 // There is already an implementor. Use itself as an indicator of
887 // more than one implementors.
888 set_implementor(this);
889 }
890
891 // The implementor also implements the transitive_interfaces
892 for (int index = 0; index < local_interfaces()->length(); index++) {
893 InstanceKlass::cast(local_interfaces()->at(index))->add_implementor(k);
894 }
895 }
896
897 void InstanceKlass::init_implementor() {
898 if (is_interface()) {
899 set_implementor(NULL);
900 }
901 }
902
903
904 void InstanceKlass::process_interfaces(Thread *thread) {
905 // link this class into the implementors list of every interface it implements
906 for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
907 assert(local_interfaces()->at(i)->is_klass(), "must be a klass");
908 InstanceKlass* interf = InstanceKlass::cast(local_interfaces()->at(i));
909 assert(interf->is_interface(), "expected interface");
910 interf->add_implementor(this);
911 }
912 }
913
914 bool InstanceKlass::can_be_primary_super_slow() const {
915 if (is_interface())
916 return false;
917 else
918 return Klass::can_be_primary_super_slow();
919 }
920
921 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots,
922 Array<Klass*>* transitive_interfaces) {
923 // The secondaries are the implemented interfaces.
924 Array<Klass*>* interfaces = transitive_interfaces;
925 int num_secondaries = num_extra_slots + interfaces->length();
926 if (num_secondaries == 0) {
927 // Must share this for correct bootstrapping!
928 set_secondary_supers(Universe::the_empty_klass_array());
929 return NULL;
930 } else if (num_extra_slots == 0) {
931 // The secondary super list is exactly the same as the transitive interfaces.
932 // Redefine classes has to be careful not to delete this!
933 set_secondary_supers(interfaces);
934 return NULL;
935 } else {
936 // Copy transitive interfaces to a temporary growable array to be constructed
937 // into the secondary super list with extra slots.
938 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length());
939 for (int i = 0; i < interfaces->length(); i++) {
940 secondaries->push(interfaces->at(i));
941 }
942 return secondaries;
943 }
944 }
945
946 bool InstanceKlass::compute_is_subtype_of(Klass* k) {
947 if (k->is_interface()) {
948 return implements_interface(k);
949 } else {
950 return Klass::compute_is_subtype_of(k);
951 }
952 }
953
954 bool InstanceKlass::implements_interface(Klass* k) const {
955 if (this == k) return true;
956 assert(k->is_interface(), "should be an interface class");
957 for (int i = 0; i < transitive_interfaces()->length(); i++) {
958 if (transitive_interfaces()->at(i) == k) {
959 return true;
960 }
961 }
962 return false;
963 }
964
965 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const {
966 // Verify direct super interface
967 if (this == k) return true;
968 assert(k->is_interface(), "should be an interface class");
969 for (int i = 0; i < local_interfaces()->length(); i++) {
970 if (local_interfaces()->at(i) == k) {
971 return true;
972 }
973 }
974 return false;
975 }
976
977 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) {
978 if (length < 0) THROW_0(vmSymbols::java_lang_NegativeArraySizeException());
979 if (length > arrayOopDesc::max_array_length(T_OBJECT)) {
980 report_java_out_of_memory("Requested array size exceeds VM limit");
981 JvmtiExport::post_array_size_exhausted();
982 THROW_OOP_0(Universe::out_of_memory_error_array_size());
983 }
984 int size = objArrayOopDesc::object_size(length);
985 Klass* ak = array_klass(n, CHECK_NULL);
986 objArrayOop o =
987 (objArrayOop)CollectedHeap::array_allocate(ak, size, length, CHECK_NULL);
988 return o;
989 }
990
991 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
992 if (TraceFinalizerRegistration) {
993 tty->print("Registered ");
994 i->print_value_on(tty);
995 tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", p2i(i));
996 }
997 instanceHandle h_i(THREAD, i);
998 // Pass the handle as argument, JavaCalls::call expects oop as jobjects
999 JavaValue result(T_VOID);
1000 JavaCallArguments args(h_i);
1001 methodHandle mh (THREAD, Universe::finalizer_register_method());
1002 JavaCalls::call(&result, mh, &args, CHECK_NULL);
1003 return h_i();
1004 }
1005
1006 instanceOop InstanceKlass::allocate_instance(TRAPS) {
1007 bool has_finalizer_flag = has_finalizer(); // Query before possible GC
1008 int size = size_helper(); // Query before forming handle.
1009
1010 instanceOop i;
1011
1012 i = (instanceOop)CollectedHeap::obj_allocate(this, size, CHECK_NULL);
1013 if (has_finalizer_flag && !RegisterFinalizersAtInit) {
1014 i = register_finalizer(i, CHECK_NULL);
1015 }
1016 return i;
1017 }
1018
1019 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) {
1020 return instanceHandle(THREAD, allocate_instance(THREAD));
1021 }
1022
1023 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1024 if (is_interface() || is_abstract()) {
1025 ResourceMark rm(THREAD);
1026 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1027 : vmSymbols::java_lang_InstantiationException(), external_name());
1028 }
1029 if (this == SystemDictionary::Class_klass()) {
1030 ResourceMark rm(THREAD);
1031 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1032 : vmSymbols::java_lang_IllegalAccessException(), external_name());
1033 }
1034 }
1035
1036 Klass* InstanceKlass::array_klass_impl(bool or_null, int n, TRAPS) {
1037 // Need load-acquire for lock-free read
1038 if (array_klasses_acquire() == NULL) {
1039 if (or_null) return NULL;
1040
1041 ResourceMark rm;
1042 JavaThread *jt = (JavaThread *)THREAD;
1043 {
1044 // Atomic creation of array_klasses
1045 MutexLocker mc(Compile_lock, THREAD); // for vtables
1046 MutexLocker ma(MultiArray_lock, THREAD);
1047
1048 // Check if update has already taken place
1049 if (array_klasses() == NULL) {
1050 Klass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this, CHECK_NULL);
1051 // use 'release' to pair with lock-free load
1052 release_set_array_klasses(k);
1053 }
1054 }
1055 }
1056 // _this will always be set at this point
1057 ObjArrayKlass* oak = (ObjArrayKlass*)array_klasses();
1058 if (or_null) {
1059 return oak->array_klass_or_null(n);
1060 }
1061 return oak->array_klass(n, THREAD);
1062 }
1063
1064 Klass* InstanceKlass::array_klass_impl(bool or_null, TRAPS) {
1065 return array_klass_impl(or_null, 1, THREAD);
1066 }
1067
1068 static int call_class_initializer_counter = 0; // for debugging
1069
1070 Method* InstanceKlass::class_initializer() const {
1071 Method* clinit = find_method(
1072 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1073 if (clinit != NULL && clinit->has_valid_initializer_flags()) {
1074 return clinit;
1075 }
1076 return NULL;
1077 }
1078
1079 void InstanceKlass::call_class_initializer(TRAPS) {
1080 if (ReplayCompiles &&
1081 (ReplaySuppressInitializers == 1 ||
1082 (ReplaySuppressInitializers >= 2 && class_loader() != NULL))) {
1083 // Hide the existence of the initializer for the purpose of replaying the compile
1084 return;
1085 }
1086
1087 methodHandle h_method(THREAD, class_initializer());
1088 assert(!is_initialized(), "we cannot initialize twice");
1089 LogTarget(Info, class, init) lt;
1090 if (lt.is_enabled()) {
1091 ResourceMark rm;
1092 LogStream ls(lt);
1093 ls.print("%d Initializing ", call_class_initializer_counter++);
1094 name()->print_value_on(&ls);
1095 ls.print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", p2i(this));
1096 }
1097 if (h_method() != NULL) {
1098 JavaCallArguments args; // No arguments
1099 JavaValue result(T_VOID);
1100 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1101 }
1102 }
1103
1104
1105 void InstanceKlass::mask_for(const methodHandle& method, int bci,
1106 InterpreterOopMap* entry_for) {
1107 // Lazily create the _oop_map_cache at first request
1108 // Lock-free access requires load_acquire.
1109 OopMapCache* oop_map_cache = OrderAccess::load_acquire(&_oop_map_cache);
1110 if (oop_map_cache == NULL) {
1111 MutexLocker x(OopMapCacheAlloc_lock);
1112 // Check if _oop_map_cache was allocated while we were waiting for this lock
1113 if ((oop_map_cache = _oop_map_cache) == NULL) {
1114 oop_map_cache = new OopMapCache();
1115 // Ensure _oop_map_cache is stable, since it is examined without a lock
1116 OrderAccess::release_store(&_oop_map_cache, oop_map_cache);
1117 }
1118 }
1119 // _oop_map_cache is constant after init; lookup below does its own locking.
1120 oop_map_cache->lookup(method, bci, entry_for);
1121 }
1122
1123
1124 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1125 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1126 Symbol* f_name = fs.name();
1127 Symbol* f_sig = fs.signature();
1128 if (f_name == name && f_sig == sig) {
1129 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1130 return true;
1131 }
1132 }
1133 return false;
1134 }
1135
1136
1137 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1138 const int n = local_interfaces()->length();
1139 for (int i = 0; i < n; i++) {
1140 Klass* intf1 = local_interfaces()->at(i);
1141 assert(intf1->is_interface(), "just checking type");
1142 // search for field in current interface
1143 if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) {
1144 assert(fd->is_static(), "interface field must be static");
1145 return intf1;
1146 }
1147 // search for field in direct superinterfaces
1148 Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd);
1149 if (intf2 != NULL) return intf2;
1150 }
1151 // otherwise field lookup fails
1152 return NULL;
1153 }
1154
1155
1156 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1157 // search order according to newest JVM spec (5.4.3.2, p.167).
1158 // 1) search for field in current klass
1159 if (find_local_field(name, sig, fd)) {
1160 return const_cast<InstanceKlass*>(this);
1161 }
1162 // 2) search for field recursively in direct superinterfaces
1163 { Klass* intf = find_interface_field(name, sig, fd);
1164 if (intf != NULL) return intf;
1165 }
1166 // 3) apply field lookup recursively if superclass exists
1167 { Klass* supr = super();
1168 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, fd);
1169 }
1170 // 4) otherwise field lookup fails
1171 return NULL;
1172 }
1173
1174
1175 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
1176 // search order according to newest JVM spec (5.4.3.2, p.167).
1177 // 1) search for field in current klass
1178 if (find_local_field(name, sig, fd)) {
1179 if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
1180 }
1181 // 2) search for field recursively in direct superinterfaces
1182 if (is_static) {
1183 Klass* intf = find_interface_field(name, sig, fd);
1184 if (intf != NULL) return intf;
1185 }
1186 // 3) apply field lookup recursively if superclass exists
1187 { Klass* supr = super();
1188 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd);
1189 }
1190 // 4) otherwise field lookup fails
1191 return NULL;
1192 }
1193
1194
1195 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1196 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1197 if (fs.offset() == offset) {
1198 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1199 if (fd->is_static() == is_static) return true;
1200 }
1201 }
1202 return false;
1203 }
1204
1205
1206 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1207 Klass* klass = const_cast<InstanceKlass*>(this);
1208 while (klass != NULL) {
1209 if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) {
1210 return true;
1211 }
1212 klass = klass->super();
1213 }
1214 return false;
1215 }
1216
1217
1218 void InstanceKlass::methods_do(void f(Method* method)) {
1219 // Methods aren't stable until they are loaded. This can be read outside
1220 // a lock through the ClassLoaderData for profiling
1221 if (!is_loaded()) {
1222 return;
1223 }
1224
1225 int len = methods()->length();
1226 for (int index = 0; index < len; index++) {
1227 Method* m = methods()->at(index);
1228 assert(m->is_method(), "must be method");
1229 f(m);
1230 }
1231 }
1232
1233
1234 void InstanceKlass::do_local_static_fields(FieldClosure* cl) {
1235 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1236 if (fs.access_flags().is_static()) {
1237 fieldDescriptor& fd = fs.field_descriptor();
1238 cl->do_field(&fd);
1239 }
1240 }
1241 }
1242
1243
1244 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) {
1245 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1246 if (fs.access_flags().is_static()) {
1247 fieldDescriptor& fd = fs.field_descriptor();
1248 f(&fd, mirror, CHECK);
1249 }
1250 }
1251 }
1252
1253
1254 static int compare_fields_by_offset(int* a, int* b) {
1255 return a[0] - b[0];
1256 }
1257
1258 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) {
1259 InstanceKlass* super = superklass();
1260 if (super != NULL) {
1261 super->do_nonstatic_fields(cl);
1262 }
1263 fieldDescriptor fd;
1264 int length = java_fields_count();
1265 // In DebugInfo nonstatic fields are sorted by offset.
1266 int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1), mtClass);
1267 int j = 0;
1268 for (int i = 0; i < length; i += 1) {
1269 fd.reinitialize(this, i);
1270 if (!fd.is_static()) {
1271 fields_sorted[j + 0] = fd.offset();
1272 fields_sorted[j + 1] = i;
1273 j += 2;
1274 }
1275 }
1276 if (j > 0) {
1277 length = j;
1278 // _sort_Fn is defined in growableArray.hpp.
1279 qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset);
1280 for (int i = 0; i < length; i += 2) {
1281 fd.reinitialize(this, fields_sorted[i + 1]);
1282 assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields");
1283 cl->do_field(&fd);
1284 }
1285 }
1286 FREE_C_HEAP_ARRAY(int, fields_sorted);
1287 }
1288
1289
1290 void InstanceKlass::array_klasses_do(void f(Klass* k, TRAPS), TRAPS) {
1291 if (array_klasses() != NULL)
1292 ArrayKlass::cast(array_klasses())->array_klasses_do(f, THREAD);
1293 }
1294
1295 void InstanceKlass::array_klasses_do(void f(Klass* k)) {
1296 if (array_klasses() != NULL)
1297 ArrayKlass::cast(array_klasses())->array_klasses_do(f);
1298 }
1299
1300 #ifdef ASSERT
1301 static int linear_search(const Array<Method*>* methods,
1302 const Symbol* name,
1303 const Symbol* signature) {
1304 const int len = methods->length();
1305 for (int index = 0; index < len; index++) {
1306 const Method* const m = methods->at(index);
1307 assert(m->is_method(), "must be method");
1308 if (m->signature() == signature && m->name() == name) {
1309 return index;
1310 }
1311 }
1312 return -1;
1313 }
1314 #endif
1315
1316 static int binary_search(const Array<Method*>* methods, const Symbol* name) {
1317 int len = methods->length();
1318 // methods are sorted, so do binary search
1319 int l = 0;
1320 int h = len - 1;
1321 while (l <= h) {
1322 int mid = (l + h) >> 1;
1323 Method* m = methods->at(mid);
1324 assert(m->is_method(), "must be method");
1325 int res = m->name()->fast_compare(name);
1326 if (res == 0) {
1327 return mid;
1328 } else if (res < 0) {
1329 l = mid + 1;
1330 } else {
1331 h = mid - 1;
1332 }
1333 }
1334 return -1;
1335 }
1336
1337 // find_method looks up the name/signature in the local methods array
1338 Method* InstanceKlass::find_method(const Symbol* name,
1339 const Symbol* signature) const {
1340 return find_method_impl(name, signature, find_overpass, find_static, find_private);
1341 }
1342
1343 Method* InstanceKlass::find_method_impl(const Symbol* name,
1344 const Symbol* signature,
1345 OverpassLookupMode overpass_mode,
1346 StaticLookupMode static_mode,
1347 PrivateLookupMode private_mode) const {
1348 return InstanceKlass::find_method_impl(methods(),
1349 name,
1350 signature,
1351 overpass_mode,
1352 static_mode,
1353 private_mode);
1354 }
1355
1356 // find_instance_method looks up the name/signature in the local methods array
1357 // and skips over static methods
1358 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods,
1359 const Symbol* name,
1360 const Symbol* signature) {
1361 Method* const meth = InstanceKlass::find_method_impl(methods,
1362 name,
1363 signature,
1364 find_overpass,
1365 skip_static,
1366 find_private);
1367 assert(((meth == NULL) || !meth->is_static()),
1368 "find_instance_method should have skipped statics");
1369 return meth;
1370 }
1371
1372 // find_instance_method looks up the name/signature in the local methods array
1373 // and skips over static methods
1374 Method* InstanceKlass::find_instance_method(const Symbol* name, const Symbol* signature) const {
1375 return InstanceKlass::find_instance_method(methods(), name, signature);
1376 }
1377
1378 // Find looks up the name/signature in the local methods array
1379 // and filters on the overpass, static and private flags
1380 // This returns the first one found
1381 // note that the local methods array can have up to one overpass, one static
1382 // and one instance (private or not) with the same name/signature
1383 Method* InstanceKlass::find_local_method(const Symbol* name,
1384 const Symbol* signature,
1385 OverpassLookupMode overpass_mode,
1386 StaticLookupMode static_mode,
1387 PrivateLookupMode private_mode) const {
1388 return InstanceKlass::find_method_impl(methods(),
1389 name,
1390 signature,
1391 overpass_mode,
1392 static_mode,
1393 private_mode);
1394 }
1395
1396 // Find looks up the name/signature in the local methods array
1397 // and filters on the overpass, static and private flags
1398 // This returns the first one found
1399 // note that the local methods array can have up to one overpass, one static
1400 // and one instance (private or not) with the same name/signature
1401 Method* InstanceKlass::find_local_method(const Array<Method*>* methods,
1402 const Symbol* name,
1403 const Symbol* signature,
1404 OverpassLookupMode overpass_mode,
1405 StaticLookupMode static_mode,
1406 PrivateLookupMode private_mode) {
1407 return InstanceKlass::find_method_impl(methods,
1408 name,
1409 signature,
1410 overpass_mode,
1411 static_mode,
1412 private_mode);
1413 }
1414
1415 Method* InstanceKlass::find_method(const Array<Method*>* methods,
1416 const Symbol* name,
1417 const Symbol* signature) {
1418 return InstanceKlass::find_method_impl(methods,
1419 name,
1420 signature,
1421 find_overpass,
1422 find_static,
1423 find_private);
1424 }
1425
1426 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods,
1427 const Symbol* name,
1428 const Symbol* signature,
1429 OverpassLookupMode overpass_mode,
1430 StaticLookupMode static_mode,
1431 PrivateLookupMode private_mode) {
1432 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode);
1433 return hit >= 0 ? methods->at(hit): NULL;
1434 }
1435
1436 // true if method matches signature and conforms to skipping_X conditions.
1437 static bool method_matches(const Method* m,
1438 const Symbol* signature,
1439 bool skipping_overpass,
1440 bool skipping_static,
1441 bool skipping_private) {
1442 return ((m->signature() == signature) &&
1443 (!skipping_overpass || !m->is_overpass()) &&
1444 (!skipping_static || !m->is_static()) &&
1445 (!skipping_private || !m->is_private()));
1446 }
1447
1448 // Used directly for default_methods to find the index into the
1449 // default_vtable_indices, and indirectly by find_method
1450 // find_method_index looks in the local methods array to return the index
1451 // of the matching name/signature. If, overpass methods are being ignored,
1452 // the search continues to find a potential non-overpass match. This capability
1453 // is important during method resolution to prefer a static method, for example,
1454 // over an overpass method.
1455 // There is the possibility in any _method's array to have the same name/signature
1456 // for a static method, an overpass method and a local instance method
1457 // To correctly catch a given method, the search criteria may need
1458 // to explicitly skip the other two. For local instance methods, it
1459 // is often necessary to skip private methods
1460 int InstanceKlass::find_method_index(const Array<Method*>* methods,
1461 const Symbol* name,
1462 const Symbol* signature,
1463 OverpassLookupMode overpass_mode,
1464 StaticLookupMode static_mode,
1465 PrivateLookupMode private_mode) {
1466 const bool skipping_overpass = (overpass_mode == skip_overpass);
1467 const bool skipping_static = (static_mode == skip_static);
1468 const bool skipping_private = (private_mode == skip_private);
1469 const int hit = binary_search(methods, name);
1470 if (hit != -1) {
1471 const Method* const m = methods->at(hit);
1472
1473 // Do linear search to find matching signature. First, quick check
1474 // for common case, ignoring overpasses if requested.
1475 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1476 return hit;
1477 }
1478
1479 // search downwards through overloaded methods
1480 int i;
1481 for (i = hit - 1; i >= 0; --i) {
1482 const Method* const m = methods->at(i);
1483 assert(m->is_method(), "must be method");
1484 if (m->name() != name) {
1485 break;
1486 }
1487 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1488 return i;
1489 }
1490 }
1491 // search upwards
1492 for (i = hit + 1; i < methods->length(); ++i) {
1493 const Method* const m = methods->at(i);
1494 assert(m->is_method(), "must be method");
1495 if (m->name() != name) {
1496 break;
1497 }
1498 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1499 return i;
1500 }
1501 }
1502 // not found
1503 #ifdef ASSERT
1504 const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 :
1505 linear_search(methods, name, signature);
1506 assert(-1 == index, "binary search should have found entry %d", index);
1507 #endif
1508 }
1509 return -1;
1510 }
1511
1512 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const {
1513 return find_method_by_name(methods(), name, end);
1514 }
1515
1516 int InstanceKlass::find_method_by_name(const Array<Method*>* methods,
1517 const Symbol* name,
1518 int* end_ptr) {
1519 assert(end_ptr != NULL, "just checking");
1520 int start = binary_search(methods, name);
1521 int end = start + 1;
1522 if (start != -1) {
1523 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
1524 while (end < methods->length() && (methods->at(end))->name() == name) ++end;
1525 *end_ptr = end;
1526 return start;
1527 }
1528 return -1;
1529 }
1530
1531 // uncached_lookup_method searches both the local class methods array and all
1532 // superclasses methods arrays, skipping any overpass methods in superclasses.
1533 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
1534 const Symbol* signature,
1535 OverpassLookupMode overpass_mode) const {
1536 OverpassLookupMode overpass_local_mode = overpass_mode;
1537 const Klass* klass = this;
1538 while (klass != NULL) {
1539 Method* const method = InstanceKlass::cast(klass)->find_method_impl(name,
1540 signature,
1541 overpass_local_mode,
1542 find_static,
1543 find_private);
1544 if (method != NULL) {
1545 return method;
1546 }
1547 klass = klass->super();
1548 overpass_local_mode = skip_overpass; // Always ignore overpass methods in superclasses
1549 }
1550 return NULL;
1551 }
1552
1553 #ifdef ASSERT
1554 // search through class hierarchy and return true if this class or
1555 // one of the superclasses was redefined
1556 bool InstanceKlass::has_redefined_this_or_super() const {
1557 const Klass* klass = this;
1558 while (klass != NULL) {
1559 if (InstanceKlass::cast(klass)->has_been_redefined()) {
1560 return true;
1561 }
1562 klass = klass->super();
1563 }
1564 return false;
1565 }
1566 #endif
1567
1568 // lookup a method in the default methods list then in all transitive interfaces
1569 // Do NOT return private or static methods
1570 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
1571 Symbol* signature) const {
1572 Method* m = NULL;
1573 if (default_methods() != NULL) {
1574 m = find_method(default_methods(), name, signature);
1575 }
1576 // Look up interfaces
1577 if (m == NULL) {
1578 m = lookup_method_in_all_interfaces(name, signature, find_defaults);
1579 }
1580 return m;
1581 }
1582
1583 // lookup a method in all the interfaces that this class implements
1584 // Do NOT return private or static methods, new in JDK8 which are not externally visible
1585 // They should only be found in the initial InterfaceMethodRef
1586 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
1587 Symbol* signature,
1588 DefaultsLookupMode defaults_mode) const {
1589 Array<Klass*>* all_ifs = transitive_interfaces();
1590 int num_ifs = all_ifs->length();
1591 InstanceKlass *ik = NULL;
1592 for (int i = 0; i < num_ifs; i++) {
1593 ik = InstanceKlass::cast(all_ifs->at(i));
1594 Method* m = ik->lookup_method(name, signature);
1595 if (m != NULL && m->is_public() && !m->is_static() &&
1596 ((defaults_mode != skip_defaults) || !m->is_default_method())) {
1597 return m;
1598 }
1599 }
1600 return NULL;
1601 }
1602
1603 /* jni_id_for_impl for jfieldIds only */
1604 JNIid* InstanceKlass::jni_id_for_impl(int offset) {
1605 MutexLocker ml(JfieldIdCreation_lock);
1606 // Retry lookup after we got the lock
1607 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
1608 if (probe == NULL) {
1609 // Slow case, allocate new static field identifier
1610 probe = new JNIid(this, offset, jni_ids());
1611 set_jni_ids(probe);
1612 }
1613 return probe;
1614 }
1615
1616
1617 /* jni_id_for for jfieldIds only */
1618 JNIid* InstanceKlass::jni_id_for(int offset) {
1619 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
1620 if (probe == NULL) {
1621 probe = jni_id_for_impl(offset);
1622 }
1623 return probe;
1624 }
1625
1626 u2 InstanceKlass::enclosing_method_data(int offset) const {
1627 const Array<jushort>* const inner_class_list = inner_classes();
1628 if (inner_class_list == NULL) {
1629 return 0;
1630 }
1631 const int length = inner_class_list->length();
1632 if (length % inner_class_next_offset == 0) {
1633 return 0;
1634 }
1635 const int index = length - enclosing_method_attribute_size;
1636 assert(offset < enclosing_method_attribute_size, "invalid offset");
1637 return inner_class_list->at(index + offset);
1638 }
1639
1640 void InstanceKlass::set_enclosing_method_indices(u2 class_index,
1641 u2 method_index) {
1642 Array<jushort>* inner_class_list = inner_classes();
1643 assert (inner_class_list != NULL, "_inner_classes list is not set up");
1644 int length = inner_class_list->length();
1645 if (length % inner_class_next_offset == enclosing_method_attribute_size) {
1646 int index = length - enclosing_method_attribute_size;
1647 inner_class_list->at_put(
1648 index + enclosing_method_class_index_offset, class_index);
1649 inner_class_list->at_put(
1650 index + enclosing_method_method_index_offset, method_index);
1651 }
1652 }
1653
1654 // Lookup or create a jmethodID.
1655 // This code is called by the VMThread and JavaThreads so the
1656 // locking has to be done very carefully to avoid deadlocks
1657 // and/or other cache consistency problems.
1658 //
1659 jmethodID InstanceKlass::get_jmethod_id(const methodHandle& method_h) {
1660 size_t idnum = (size_t)method_h->method_idnum();
1661 jmethodID* jmeths = methods_jmethod_ids_acquire();
1662 size_t length = 0;
1663 jmethodID id = NULL;
1664
1665 // We use a double-check locking idiom here because this cache is
1666 // performance sensitive. In the normal system, this cache only
1667 // transitions from NULL to non-NULL which is safe because we use
1668 // release_set_methods_jmethod_ids() to advertise the new cache.
1669 // A partially constructed cache should never be seen by a racing
1670 // thread. We also use release_store() to save a new jmethodID
1671 // in the cache so a partially constructed jmethodID should never be
1672 // seen either. Cache reads of existing jmethodIDs proceed without a
1673 // lock, but cache writes of a new jmethodID requires uniqueness and
1674 // creation of the cache itself requires no leaks so a lock is
1675 // generally acquired in those two cases.
1676 //
1677 // If the RedefineClasses() API has been used, then this cache can
1678 // grow and we'll have transitions from non-NULL to bigger non-NULL.
1679 // Cache creation requires no leaks and we require safety between all
1680 // cache accesses and freeing of the old cache so a lock is generally
1681 // acquired when the RedefineClasses() API has been used.
1682
1683 if (jmeths != NULL) {
1684 // the cache already exists
1685 if (!idnum_can_increment()) {
1686 // the cache can't grow so we can just get the current values
1687 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
1688 } else {
1689 // cache can grow so we have to be more careful
1690 if (Threads::number_of_threads() == 0 ||
1691 SafepointSynchronize::is_at_safepoint()) {
1692 // we're single threaded or at a safepoint - no locking needed
1693 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
1694 } else {
1695 MutexLocker ml(JmethodIdCreation_lock);
1696 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
1697 }
1698 }
1699 }
1700 // implied else:
1701 // we need to allocate a cache so default length and id values are good
1702
1703 if (jmeths == NULL || // no cache yet
1704 length <= idnum || // cache is too short
1705 id == NULL) { // cache doesn't contain entry
1706
1707 // This function can be called by the VMThread so we have to do all
1708 // things that might block on a safepoint before grabbing the lock.
1709 // Otherwise, we can deadlock with the VMThread or have a cache
1710 // consistency issue. These vars keep track of what we might have
1711 // to free after the lock is dropped.
1712 jmethodID to_dealloc_id = NULL;
1713 jmethodID* to_dealloc_jmeths = NULL;
1714
1715 // may not allocate new_jmeths or use it if we allocate it
1716 jmethodID* new_jmeths = NULL;
1717 if (length <= idnum) {
1718 // allocate a new cache that might be used
1719 size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count());
1720 new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1, mtClass);
1721 memset(new_jmeths, 0, (size+1)*sizeof(jmethodID));
1722 // cache size is stored in element[0], other elements offset by one
1723 new_jmeths[0] = (jmethodID)size;
1724 }
1725
1726 // allocate a new jmethodID that might be used
1727 jmethodID new_id = NULL;
1728 if (method_h->is_old() && !method_h->is_obsolete()) {
1729 // The method passed in is old (but not obsolete), we need to use the current version
1730 Method* current_method = method_with_idnum((int)idnum);
1731 assert(current_method != NULL, "old and but not obsolete, so should exist");
1732 new_id = Method::make_jmethod_id(class_loader_data(), current_method);
1733 } else {
1734 // It is the current version of the method or an obsolete method,
1735 // use the version passed in
1736 new_id = Method::make_jmethod_id(class_loader_data(), method_h());
1737 }
1738
1739 if (Threads::number_of_threads() == 0 ||
1740 SafepointSynchronize::is_at_safepoint()) {
1741 // we're single threaded or at a safepoint - no locking needed
1742 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
1743 &to_dealloc_id, &to_dealloc_jmeths);
1744 } else {
1745 MutexLocker ml(JmethodIdCreation_lock);
1746 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
1747 &to_dealloc_id, &to_dealloc_jmeths);
1748 }
1749
1750 // The lock has been dropped so we can free resources.
1751 // Free up either the old cache or the new cache if we allocated one.
1752 if (to_dealloc_jmeths != NULL) {
1753 FreeHeap(to_dealloc_jmeths);
1754 }
1755 // free up the new ID since it wasn't needed
1756 if (to_dealloc_id != NULL) {
1757 Method::destroy_jmethod_id(class_loader_data(), to_dealloc_id);
1758 }
1759 }
1760 return id;
1761 }
1762
1763 // Figure out how many jmethodIDs haven't been allocated, and make
1764 // sure space for them is pre-allocated. This makes getting all
1765 // method ids much, much faster with classes with more than 8
1766 // methods, and has a *substantial* effect on performance with jvmti
1767 // code that loads all jmethodIDs for all classes.
1768 void InstanceKlass::ensure_space_for_methodids(int start_offset) {
1769 int new_jmeths = 0;
1770 int length = methods()->length();
1771 for (int index = start_offset; index < length; index++) {
1772 Method* m = methods()->at(index);
1773 jmethodID id = m->find_jmethod_id_or_null();
1774 if (id == NULL) {
1775 new_jmeths++;
1776 }
1777 }
1778 if (new_jmeths != 0) {
1779 Method::ensure_jmethod_ids(class_loader_data(), new_jmeths);
1780 }
1781 }
1782
1783 // Common code to fetch the jmethodID from the cache or update the
1784 // cache with the new jmethodID. This function should never do anything
1785 // that causes the caller to go to a safepoint or we can deadlock with
1786 // the VMThread or have cache consistency issues.
1787 //
1788 jmethodID InstanceKlass::get_jmethod_id_fetch_or_update(
1789 size_t idnum, jmethodID new_id,
1790 jmethodID* new_jmeths, jmethodID* to_dealloc_id_p,
1791 jmethodID** to_dealloc_jmeths_p) {
1792 assert(new_id != NULL, "sanity check");
1793 assert(to_dealloc_id_p != NULL, "sanity check");
1794 assert(to_dealloc_jmeths_p != NULL, "sanity check");
1795 assert(Threads::number_of_threads() == 0 ||
1796 SafepointSynchronize::is_at_safepoint() ||
1797 JmethodIdCreation_lock->owned_by_self(), "sanity check");
1798
1799 // reacquire the cache - we are locked, single threaded or at a safepoint
1800 jmethodID* jmeths = methods_jmethod_ids_acquire();
1801 jmethodID id = NULL;
1802 size_t length = 0;
1803
1804 if (jmeths == NULL || // no cache yet
1805 (length = (size_t)jmeths[0]) <= idnum) { // cache is too short
1806 if (jmeths != NULL) {
1807 // copy any existing entries from the old cache
1808 for (size_t index = 0; index < length; index++) {
1809 new_jmeths[index+1] = jmeths[index+1];
1810 }
1811 *to_dealloc_jmeths_p = jmeths; // save old cache for later delete
1812 }
1813 release_set_methods_jmethod_ids(jmeths = new_jmeths);
1814 } else {
1815 // fetch jmethodID (if any) from the existing cache
1816 id = jmeths[idnum+1];
1817 *to_dealloc_jmeths_p = new_jmeths; // save new cache for later delete
1818 }
1819 if (id == NULL) {
1820 // No matching jmethodID in the existing cache or we have a new
1821 // cache or we just grew the cache. This cache write is done here
1822 // by the first thread to win the foot race because a jmethodID
1823 // needs to be unique once it is generally available.
1824 id = new_id;
1825
1826 // The jmethodID cache can be read while unlocked so we have to
1827 // make sure the new jmethodID is complete before installing it
1828 // in the cache.
1829 OrderAccess::release_store(&jmeths[idnum+1], id);
1830 } else {
1831 *to_dealloc_id_p = new_id; // save new id for later delete
1832 }
1833 return id;
1834 }
1835
1836
1837 // Common code to get the jmethodID cache length and the jmethodID
1838 // value at index idnum if there is one.
1839 //
1840 void InstanceKlass::get_jmethod_id_length_value(jmethodID* cache,
1841 size_t idnum, size_t *length_p, jmethodID* id_p) {
1842 assert(cache != NULL, "sanity check");
1843 assert(length_p != NULL, "sanity check");
1844 assert(id_p != NULL, "sanity check");
1845
1846 // cache size is stored in element[0], other elements offset by one
1847 *length_p = (size_t)cache[0];
1848 if (*length_p <= idnum) { // cache is too short
1849 *id_p = NULL;
1850 } else {
1851 *id_p = cache[idnum+1]; // fetch jmethodID (if any)
1852 }
1853 }
1854
1855
1856 // Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles
1857 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
1858 size_t idnum = (size_t)method->method_idnum();
1859 jmethodID* jmeths = methods_jmethod_ids_acquire();
1860 size_t length; // length assigned as debugging crumb
1861 jmethodID id = NULL;
1862 if (jmeths != NULL && // If there is a cache
1863 (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough,
1864 id = jmeths[idnum+1]; // Look up the id (may be NULL)
1865 }
1866 return id;
1867 }
1868
1869 inline DependencyContext InstanceKlass::dependencies() {
1870 DependencyContext dep_context(&_dep_context);
1871 return dep_context;
1872 }
1873
1874 int InstanceKlass::mark_dependent_nmethods(KlassDepChange& changes) {
1875 return dependencies().mark_dependent_nmethods(changes);
1876 }
1877
1878 void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
1879 dependencies().add_dependent_nmethod(nm);
1880 }
1881
1882 void InstanceKlass::remove_dependent_nmethod(nmethod* nm, bool delete_immediately) {
1883 dependencies().remove_dependent_nmethod(nm, delete_immediately);
1884 }
1885
1886 #ifndef PRODUCT
1887 void InstanceKlass::print_dependent_nmethods(bool verbose) {
1888 dependencies().print_dependent_nmethods(verbose);
1889 }
1890
1891 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
1892 return dependencies().is_dependent_nmethod(nm);
1893 }
1894 #endif //PRODUCT
1895
1896 void InstanceKlass::clean_weak_instanceklass_links() {
1897 clean_implementors_list();
1898 clean_method_data();
1899
1900 // Since GC iterates InstanceKlasses sequentially, it is safe to remove stale entries here.
1901 DependencyContext dep_context(&_dep_context);
1902 dep_context.expunge_stale_entries();
1903 }
1904
1905 void InstanceKlass::clean_implementors_list() {
1906 assert(is_loader_alive(), "this klass should be live");
1907 if (is_interface()) {
1908 if (ClassUnloading) {
1909 Klass* impl = implementor();
1910 if (impl != NULL) {
1911 if (!impl->is_loader_alive()) {
1912 // remove this guy
1913 Klass** klass = adr_implementor();
1914 assert(klass != NULL, "null klass");
1915 if (klass != NULL) {
1916 *klass = NULL;
1917 }
1918 }
1919 }
1920 }
1921 }
1922 }
1923
1924 void InstanceKlass::clean_method_data() {
1925 for (int m = 0; m < methods()->length(); m++) {
1926 MethodData* mdo = methods()->at(m)->method_data();
1927 if (mdo != NULL) {
1928 mdo->clean_method_data(/*always_clean*/false);
1929 }
1930 }
1931 }
1932
1933 bool InstanceKlass::supers_have_passed_fingerprint_checks() {
1934 if (java_super() != NULL && !java_super()->has_passed_fingerprint_check()) {
1935 ResourceMark rm;
1936 log_trace(class, fingerprint)("%s : super %s not fingerprinted", external_name(), java_super()->external_name());
1937 return false;
1938 }
1939
1940 Array<Klass*>* local_interfaces = this->local_interfaces();
1941 if (local_interfaces != NULL) {
1942 int length = local_interfaces->length();
1943 for (int i = 0; i < length; i++) {
1944 InstanceKlass* intf = InstanceKlass::cast(local_interfaces->at(i));
1945 if (!intf->has_passed_fingerprint_check()) {
1946 ResourceMark rm;
1947 log_trace(class, fingerprint)("%s : interface %s not fingerprinted", external_name(), intf->external_name());
1948 return false;
1949 }
1950 }
1951 }
1952
1953 return true;
1954 }
1955
1956 bool InstanceKlass::should_store_fingerprint(bool is_anonymous) {
1957 #if INCLUDE_AOT
1958 // We store the fingerprint into the InstanceKlass only in the following 2 cases:
1959 if (CalculateClassFingerprint) {
1960 // (1) We are running AOT to generate a shared library.
1961 return true;
1962 }
1963 if (DumpSharedSpaces) {
1964 // (2) We are running -Xshare:dump to create a shared archive
1965 return true;
1966 }
1967 if (UseAOT && is_anonymous) {
1968 // (3) We are using AOT code from a shared library and see an anonymous class
1969 return true;
1970 }
1971 #endif
1972
1973 // In all other cases we might set the _misc_has_passed_fingerprint_check bit,
1974 // but do not store the 64-bit fingerprint to save space.
1975 return false;
1976 }
1977
1978 bool InstanceKlass::has_stored_fingerprint() const {
1979 #if INCLUDE_AOT
1980 return should_store_fingerprint() || is_shared();
1981 #else
1982 return false;
1983 #endif
1984 }
1985
1986 uint64_t InstanceKlass::get_stored_fingerprint() const {
1987 address adr = adr_fingerprint();
1988 if (adr != NULL) {
1989 return (uint64_t)Bytes::get_native_u8(adr); // adr may not be 64-bit aligned
1990 }
1991 return 0;
1992 }
1993
1994 void InstanceKlass::store_fingerprint(uint64_t fingerprint) {
1995 address adr = adr_fingerprint();
1996 if (adr != NULL) {
1997 Bytes::put_native_u8(adr, (u8)fingerprint); // adr may not be 64-bit aligned
1998
1999 ResourceMark rm;
2000 log_trace(class, fingerprint)("stored as " PTR64_FORMAT " for class %s", fingerprint, external_name());
2001 }
2002 }
2003
2004 void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) {
2005 Klass::metaspace_pointers_do(it);
2006
2007 if (log_is_enabled(Trace, cds)) {
2008 ResourceMark rm;
2009 log_trace(cds)("Iter(InstanceKlass): %p (%s)", this, external_name());
2010 }
2011
2012 it->push(&_annotations);
2013 it->push((Klass**)&_array_klasses);
2014 it->push(&_constants);
2015 it->push(&_inner_classes);
2016 it->push(&_array_name);
2017 #if INCLUDE_JVMTI
2018 it->push(&_previous_versions);
2019 #endif
2020 it->push(&_methods);
2021 it->push(&_default_methods);
2022 it->push(&_local_interfaces);
2023 it->push(&_transitive_interfaces);
2024 it->push(&_method_ordering);
2025 it->push(&_default_vtable_indices);
2026 it->push(&_fields);
2027
2028 if (itable_length() > 0) {
2029 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2030 int method_table_offset_in_words = ioe->offset()/wordSize;
2031 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
2032 / itableOffsetEntry::size();
2033
2034 for (int i = 0; i < nof_interfaces; i ++, ioe ++) {
2035 if (ioe->interface_klass() != NULL) {
2036 it->push(ioe->interface_klass_addr());
2037 itableMethodEntry* ime = ioe->first_method_entry(this);
2038 int n = klassItable::method_count_for_interface(ioe->interface_klass());
2039 for (int index = 0; index < n; index ++) {
2040 it->push(ime[index].method_addr());
2041 }
2042 }
2043 }
2044 }
2045 }
2046
2047 void InstanceKlass::remove_unshareable_info() {
2048 Klass::remove_unshareable_info();
2049
2050 if (is_in_error_state()) {
2051 // Classes are attempted to link during dumping and may fail,
2052 // but these classes are still in the dictionary and class list in CLD.
2053 // Check in_error state first because in_error is > linked state, so
2054 // is_linked() is true.
2055 // If there's a linking error, there is nothing else to remove.
2056 return;
2057 }
2058
2059 // Unlink the class
2060 if (is_linked()) {
2061 unlink_class();
2062 }
2063 init_implementor();
2064
2065 constants()->remove_unshareable_info();
2066
2067 for (int i = 0; i < methods()->length(); i++) {
2068 Method* m = methods()->at(i);
2069 m->remove_unshareable_info();
2070 }
2071
2072 // do array classes also.
2073 if (array_klasses() != NULL) {
2074 array_klasses()->remove_unshareable_info();
2075 }
2076
2077 // These are not allocated from metaspace, but they should should all be empty
2078 // during dump time, so we don't need to worry about them in InstanceKlass::iterate().
2079 guarantee(_source_debug_extension == NULL, "must be");
2080 guarantee(_dep_context == DependencyContext::EMPTY, "must be");
2081 guarantee(_osr_nmethods_head == NULL, "must be");
2082
2083 #if INCLUDE_JVMTI
2084 guarantee(_breakpoints == NULL, "must be");
2085 guarantee(_previous_versions == NULL, "must be");
2086 #endif
2087
2088 _init_thread = NULL;
2089 _methods_jmethod_ids = NULL;
2090 _jni_ids = NULL;
2091 _oop_map_cache = NULL;
2092 }
2093
2094 void InstanceKlass::remove_java_mirror() {
2095 Klass::remove_java_mirror();
2096
2097 // do array classes also.
2098 if (array_klasses() != NULL) {
2099 array_klasses()->remove_java_mirror();
2100 }
2101 }
2102
2103 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) {
2104 set_package(loader_data, CHECK);
2105 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
2106
2107 Array<Method*>* methods = this->methods();
2108 int num_methods = methods->length();
2109 for (int index2 = 0; index2 < num_methods; ++index2) {
2110 methodHandle m(THREAD, methods->at(index2));
2111 m->restore_unshareable_info(CHECK);
2112 }
2113 if (JvmtiExport::has_redefined_a_class()) {
2114 // Reinitialize vtable because RedefineClasses may have changed some
2115 // entries in this vtable for super classes so the CDS vtable might
2116 // point to old or obsolete entries. RedefineClasses doesn't fix up
2117 // vtables in the shared system dictionary, only the main one.
2118 // It also redefines the itable too so fix that too.
2119 ResourceMark rm(THREAD);
2120 vtable().initialize_vtable(false, CHECK);
2121 itable().initialize_itable(false, CHECK);
2122 }
2123
2124 // restore constant pool resolved references
2125 constants()->restore_unshareable_info(CHECK);
2126
2127 if (array_klasses() != NULL) {
2128 // Array classes have null protection domain.
2129 // --> see ArrayKlass::complete_create_array_klass()
2130 array_klasses()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
2131 }
2132 }
2133
2134 // returns true IFF is_in_error_state() has been changed as a result of this call.
2135 bool InstanceKlass::check_sharing_error_state() {
2136 assert(DumpSharedSpaces, "should only be called during dumping");
2137 bool old_state = is_in_error_state();
2138
2139 if (!is_in_error_state()) {
2140 bool bad = false;
2141 for (InstanceKlass* sup = java_super(); sup; sup = sup->java_super()) {
2142 if (sup->is_in_error_state()) {
2143 bad = true;
2144 break;
2145 }
2146 }
2147 if (!bad) {
2148 Array<Klass*>* interfaces = transitive_interfaces();
2149 for (int i = 0; i < interfaces->length(); i++) {
2150 Klass* iface = interfaces->at(i);
2151 if (InstanceKlass::cast(iface)->is_in_error_state()) {
2152 bad = true;
2153 break;
2154 }
2155 }
2156 }
2157
2158 if (bad) {
2159 set_in_error_state();
2160 }
2161 }
2162
2163 return (old_state != is_in_error_state());
2164 }
2165
2166 #if INCLUDE_JVMTI
2167 static void clear_all_breakpoints(Method* m) {
2168 m->clear_all_breakpoints();
2169 }
2170 #endif
2171
2172 void InstanceKlass::notify_unload_class(InstanceKlass* ik) {
2173 // notify the debugger
2174 if (JvmtiExport::should_post_class_unload()) {
2175 JvmtiExport::post_class_unload(ik);
2176 }
2177
2178 // notify ClassLoadingService of class unload
2179 ClassLoadingService::notify_class_unloaded(ik);
2180 }
2181
2182 void InstanceKlass::release_C_heap_structures(InstanceKlass* ik) {
2183 // Clean up C heap
2184 ik->release_C_heap_structures();
2185 ik->constants()->release_C_heap_structures();
2186 }
2187
2188 void InstanceKlass::release_C_heap_structures() {
2189 // Can't release the constant pool here because the constant pool can be
2190 // deallocated separately from the InstanceKlass for default methods and
2191 // redefine classes.
2192
2193 // Deallocate oop map cache
2194 if (_oop_map_cache != NULL) {
2195 delete _oop_map_cache;
2196 _oop_map_cache = NULL;
2197 }
2198
2199 // Deallocate JNI identifiers for jfieldIDs
2200 JNIid::deallocate(jni_ids());
2201 set_jni_ids(NULL);
2202
2203 jmethodID* jmeths = methods_jmethod_ids_acquire();
2204 if (jmeths != (jmethodID*)NULL) {
2205 release_set_methods_jmethod_ids(NULL);
2206 FreeHeap(jmeths);
2207 }
2208
2209 // Release dependencies.
2210 // It is desirable to use DC::remove_all_dependents() here, but, unfortunately,
2211 // it is not safe (see JDK-8143408). The problem is that the klass dependency
2212 // context can contain live dependencies, since there's a race between nmethod &
2213 // klass unloading. If the klass is dead when nmethod unloading happens, relevant
2214 // dependencies aren't removed from the context associated with the class (see
2215 // nmethod::flush_dependencies). It ends up during klass unloading as seemingly
2216 // live dependencies pointing to unloaded nmethods and causes a crash in
2217 // DC::remove_all_dependents() when it touches unloaded nmethod.
2218 dependencies().wipe();
2219
2220 #if INCLUDE_JVMTI
2221 // Deallocate breakpoint records
2222 if (breakpoints() != 0x0) {
2223 methods_do(clear_all_breakpoints);
2224 assert(breakpoints() == 0x0, "should have cleared breakpoints");
2225 }
2226
2227 // deallocate the cached class file
2228 if (_cached_class_file != NULL && !MetaspaceShared::is_in_shared_metaspace(_cached_class_file)) {
2229 os::free(_cached_class_file);
2230 _cached_class_file = NULL;
2231 }
2232 #endif
2233
2234 // Decrement symbol reference counts associated with the unloaded class.
2235 if (_name != NULL) _name->decrement_refcount();
2236 // unreference array name derived from this class name (arrays of an unloaded
2237 // class can't be referenced anymore).
2238 if (_array_name != NULL) _array_name->decrement_refcount();
2239 if (_source_debug_extension != NULL) FREE_C_HEAP_ARRAY(char, _source_debug_extension);
2240 }
2241
2242 void InstanceKlass::set_source_debug_extension(const char* array, int length) {
2243 if (array == NULL) {
2244 _source_debug_extension = NULL;
2245 } else {
2246 // Adding one to the attribute length in order to store a null terminator
2247 // character could cause an overflow because the attribute length is
2248 // already coded with an u4 in the classfile, but in practice, it's
2249 // unlikely to happen.
2250 assert((length+1) > length, "Overflow checking");
2251 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
2252 for (int i = 0; i < length; i++) {
2253 sde[i] = array[i];
2254 }
2255 sde[length] = '\0';
2256 _source_debug_extension = sde;
2257 }
2258 }
2259
2260 const char* InstanceKlass::signature_name() const {
2261 int hash_len = 0;
2262 char hash_buf[40];
2263
2264 // If this is an anonymous class, append a hash to make the name unique
2265 if (is_anonymous()) {
2266 intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0;
2267 jio_snprintf(hash_buf, sizeof(hash_buf), "/" UINTX_FORMAT, (uintx)hash);
2268 hash_len = (int)strlen(hash_buf);
2269 }
2270
2271 // Get the internal name as a c string
2272 const char* src = (const char*) (name()->as_C_string());
2273 const int src_length = (int)strlen(src);
2274
2275 char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3);
2276
2277 // Add L as type indicator
2278 int dest_index = 0;
2279 dest[dest_index++] = 'L';
2280
2281 // Add the actual class name
2282 for (int src_index = 0; src_index < src_length; ) {
2283 dest[dest_index++] = src[src_index++];
2284 }
2285
2286 // If we have a hash, append it
2287 for (int hash_index = 0; hash_index < hash_len; ) {
2288 dest[dest_index++] = hash_buf[hash_index++];
2289 }
2290
2291 // Add the semicolon and the NULL
2292 dest[dest_index++] = ';';
2293 dest[dest_index] = '\0';
2294 return dest;
2295 }
2296
2297 // Used to obtain the package name from a fully qualified class name.
2298 Symbol* InstanceKlass::package_from_name(const Symbol* name, TRAPS) {
2299 if (name == NULL) {
2300 return NULL;
2301 } else {
2302 if (name->utf8_length() <= 0) {
2303 return NULL;
2304 }
2305 ResourceMark rm;
2306 const char* package_name = ClassLoader::package_from_name((const char*) name->as_C_string());
2307 if (package_name == NULL) {
2308 return NULL;
2309 }
2310 Symbol* pkg_name = SymbolTable::new_symbol(package_name, THREAD);
2311 return pkg_name;
2312 }
2313 }
2314
2315 ModuleEntry* InstanceKlass::module() const {
2316 if (!in_unnamed_package()) {
2317 return _package_entry->module();
2318 }
2319 const Klass* host = host_klass();
2320 if (host == NULL) {
2321 return class_loader_data()->unnamed_module();
2322 }
2323 return host->class_loader_data()->unnamed_module();
2324 }
2325
2326 void InstanceKlass::set_package(ClassLoaderData* loader_data, TRAPS) {
2327
2328 // ensure java/ packages only loaded by boot or platform builtin loaders
2329 Handle class_loader(THREAD, loader_data->class_loader());
2330 check_prohibited_package(name(), class_loader, CHECK);
2331
2332 TempNewSymbol pkg_name = package_from_name(name(), CHECK);
2333
2334 if (pkg_name != NULL && loader_data != NULL) {
2335
2336 // Find in class loader's package entry table.
2337 _package_entry = loader_data->packages()->lookup_only(pkg_name);
2338
2339 // If the package name is not found in the loader's package
2340 // entry table, it is an indication that the package has not
2341 // been defined. Consider it defined within the unnamed module.
2342 if (_package_entry == NULL) {
2343 ResourceMark rm;
2344
2345 if (!ModuleEntryTable::javabase_defined()) {
2346 // Before java.base is defined during bootstrapping, define all packages in
2347 // the java.base module. If a non-java.base package is erroneously placed
2348 // in the java.base module it will be caught later when java.base
2349 // is defined by ModuleEntryTable::verify_javabase_packages check.
2350 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, JAVA_BASE_NAME " module is NULL");
2351 _package_entry = loader_data->packages()->lookup(pkg_name, ModuleEntryTable::javabase_moduleEntry());
2352 } else {
2353 assert(loader_data->unnamed_module() != NULL, "unnamed module is NULL");
2354 _package_entry = loader_data->packages()->lookup(pkg_name,
2355 loader_data->unnamed_module());
2356 }
2357
2358 // A package should have been successfully created
2359 assert(_package_entry != NULL, "Package entry for class %s not found, loader %s",
2360 name()->as_C_string(), loader_data->loader_name());
2361 }
2362
2363 if (log_is_enabled(Debug, module)) {
2364 ResourceMark rm;
2365 ModuleEntry* m = _package_entry->module();
2366 log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s",
2367 external_name(),
2368 pkg_name->as_C_string(),
2369 loader_data->loader_name(),
2370 (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE));
2371 }
2372 } else {
2373 ResourceMark rm;
2374 log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s",
2375 external_name(),
2376 (loader_data != NULL) ? loader_data->loader_name() : "NULL",
2377 UNNAMED_MODULE);
2378 }
2379 }
2380
2381
2382 // different versions of is_same_class_package
2383
2384 bool InstanceKlass::is_same_class_package(const Klass* class2) const {
2385 oop classloader1 = this->class_loader();
2386 PackageEntry* classpkg1 = this->package();
2387 if (class2->is_objArray_klass()) {
2388 class2 = ObjArrayKlass::cast(class2)->bottom_klass();
2389 }
2390
2391 oop classloader2;
2392 PackageEntry* classpkg2;
2393 if (class2->is_instance_klass()) {
2394 classloader2 = class2->class_loader();
2395 classpkg2 = class2->package();
2396 } else {
2397 assert(class2->is_typeArray_klass(), "should be type array");
2398 classloader2 = NULL;
2399 classpkg2 = NULL;
2400 }
2401
2402 // Same package is determined by comparing class loader
2403 // and package entries. Both must be the same. This rule
2404 // applies even to classes that are defined in the unnamed
2405 // package, they still must have the same class loader.
2406 if (oopDesc::equals(classloader1, classloader2) && (classpkg1 == classpkg2)) {
2407 return true;
2408 }
2409
2410 return false;
2411 }
2412
2413 // return true if this class and other_class are in the same package. Classloader
2414 // and classname information is enough to determine a class's package
2415 bool InstanceKlass::is_same_class_package(oop other_class_loader,
2416 const Symbol* other_class_name) const {
2417 if (!oopDesc::equals(class_loader(), other_class_loader)) {
2418 return false;
2419 }
2420 if (name()->fast_compare(other_class_name) == 0) {
2421 return true;
2422 }
2423
2424 {
2425 ResourceMark rm;
2426
2427 bool bad_class_name = false;
2428 const char* other_pkg =
2429 ClassLoader::package_from_name((const char*) other_class_name->as_C_string(), &bad_class_name);
2430 if (bad_class_name) {
2431 return false;
2432 }
2433 // Check that package_from_name() returns NULL, not "", if there is no package.
2434 assert(other_pkg == NULL || strlen(other_pkg) > 0, "package name is empty string");
2435
2436 const Symbol* const this_package_name =
2437 this->package() != NULL ? this->package()->name() : NULL;
2438
2439 if (this_package_name == NULL || other_pkg == NULL) {
2440 // One of the two doesn't have a package. Only return true if the other
2441 // one also doesn't have a package.
2442 return (const char*)this_package_name == other_pkg;
2443 }
2444
2445 // Check if package is identical
2446 return this_package_name->equals(other_pkg);
2447 }
2448 }
2449
2450 // Returns true iff super_method can be overridden by a method in targetclassname
2451 // See JLS 3rd edition 8.4.6.1
2452 // Assumes name-signature match
2453 // "this" is InstanceKlass of super_method which must exist
2454 // note that the InstanceKlass of the method in the targetclassname has not always been created yet
2455 bool InstanceKlass::is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) {
2456 // Private methods can not be overridden
2457 if (super_method->is_private()) {
2458 return false;
2459 }
2460 // If super method is accessible, then override
2461 if ((super_method->is_protected()) ||
2462 (super_method->is_public())) {
2463 return true;
2464 }
2465 // Package-private methods are not inherited outside of package
2466 assert(super_method->is_package_private(), "must be package private");
2467 return(is_same_class_package(targetclassloader(), targetclassname));
2468 }
2469
2470 // Only boot and platform class loaders can define classes in "java/" packages.
2471 void InstanceKlass::check_prohibited_package(Symbol* class_name,
2472 Handle class_loader,
2473 TRAPS) {
2474 if (!class_loader.is_null() &&
2475 !SystemDictionary::is_platform_class_loader(class_loader()) &&
2476 class_name != NULL) {
2477 ResourceMark rm(THREAD);
2478 char* name = class_name->as_C_string();
2479 if (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/') {
2480 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK);
2481 assert(pkg_name != NULL, "Error in parsing package name starting with 'java/'");
2482 name = pkg_name->as_C_string();
2483 const char* class_loader_name = SystemDictionary::loader_name(class_loader());
2484 StringUtils::replace_no_expand(name, "/", ".");
2485 const char* msg_text1 = "Class loader (instance of): ";
2486 const char* msg_text2 = " tried to load prohibited package name: ";
2487 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1;
2488 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
2489 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name);
2490 THROW_MSG(vmSymbols::java_lang_SecurityException(), message);
2491 }
2492 }
2493 return;
2494 }
2495
2496 // tell if two classes have the same enclosing class (at package level)
2497 bool InstanceKlass::is_same_package_member(const Klass* class2, TRAPS) const {
2498 if (class2 == this) return true;
2499 if (!class2->is_instance_klass()) return false;
2500
2501 // must be in same package before we try anything else
2502 if (!is_same_class_package(class2))
2503 return false;
2504
2505 // As long as there is an outer_this.getEnclosingClass,
2506 // shift the search outward.
2507 const InstanceKlass* outer_this = this;
2508 for (;;) {
2509 // As we walk along, look for equalities between outer_this and class2.
2510 // Eventually, the walks will terminate as outer_this stops
2511 // at the top-level class around the original class.
2512 bool ignore_inner_is_member;
2513 const Klass* next = outer_this->compute_enclosing_class(&ignore_inner_is_member,
2514 CHECK_false);
2515 if (next == NULL) break;
2516 if (next == class2) return true;
2517 outer_this = InstanceKlass::cast(next);
2518 }
2519
2520 // Now do the same for class2.
2521 const InstanceKlass* outer2 = InstanceKlass::cast(class2);
2522 for (;;) {
2523 bool ignore_inner_is_member;
2524 Klass* next = outer2->compute_enclosing_class(&ignore_inner_is_member,
2525 CHECK_false);
2526 if (next == NULL) break;
2527 // Might as well check the new outer against all available values.
2528 if (next == this) return true;
2529 if (next == outer_this) return true;
2530 outer2 = InstanceKlass::cast(next);
2531 }
2532
2533 // If by this point we have not found an equality between the
2534 // two classes, we know they are in separate package members.
2535 return false;
2536 }
2537
2538 bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const {
2539 constantPoolHandle i_cp(THREAD, constants());
2540 for (InnerClassesIterator iter(this); !iter.done(); iter.next()) {
2541 int ioff = iter.inner_class_info_index();
2542 if (ioff != 0) {
2543 // Check to see if the name matches the class we're looking for
2544 // before attempting to find the class.
2545 if (i_cp->klass_name_at_matches(this, ioff)) {
2546 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false);
2547 if (this == inner_klass) {
2548 *ooff = iter.outer_class_info_index();
2549 *noff = iter.inner_name_index();
2550 return true;
2551 }
2552 }
2553 }
2554 }
2555 return false;
2556 }
2557
2558 InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const {
2559 InstanceKlass* outer_klass = NULL;
2560 *inner_is_member = false;
2561 int ooff = 0, noff = 0;
2562 bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD);
2563 if (has_inner_classes_attr) {
2564 constantPoolHandle i_cp(THREAD, constants());
2565 if (ooff != 0) {
2566 Klass* ok = i_cp->klass_at(ooff, CHECK_NULL);
2567 outer_klass = InstanceKlass::cast(ok);
2568 *inner_is_member = true;
2569 }
2570 if (NULL == outer_klass) {
2571 // It may be anonymous; try for that.
2572 int encl_method_class_idx = enclosing_method_class_index();
2573 if (encl_method_class_idx != 0) {
2574 Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
2575 outer_klass = InstanceKlass::cast(ok);
2576 *inner_is_member = false;
2577 }
2578 }
2579 }
2580
2581 // If no inner class attribute found for this class.
2582 if (NULL == outer_klass) return NULL;
2583
2584 // Throws an exception if outer klass has not declared k as an inner klass
2585 // We need evidence that each klass knows about the other, or else
2586 // the system could allow a spoof of an inner class to gain access rights.
2587 Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL);
2588 return outer_klass;
2589 }
2590
2591 jint InstanceKlass::compute_modifier_flags(TRAPS) const {
2592 jint access = access_flags().as_int();
2593
2594 // But check if it happens to be member class.
2595 InnerClassesIterator iter(this);
2596 for (; !iter.done(); iter.next()) {
2597 int ioff = iter.inner_class_info_index();
2598 // Inner class attribute can be zero, skip it.
2599 // Strange but true: JVM spec. allows null inner class refs.
2600 if (ioff == 0) continue;
2601
2602 // only look at classes that are already loaded
2603 // since we are looking for the flags for our self.
2604 Symbol* inner_name = constants()->klass_name_at(ioff);
2605 if (name() == inner_name) {
2606 // This is really a member class.
2607 access = iter.inner_access_flags();
2608 break;
2609 }
2610 }
2611 // Remember to strip ACC_SUPER bit
2612 return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS;
2613 }
2614
2615 jint InstanceKlass::jvmti_class_status() const {
2616 jint result = 0;
2617
2618 if (is_linked()) {
2619 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
2620 }
2621
2622 if (is_initialized()) {
2623 assert(is_linked(), "Class status is not consistent");
2624 result |= JVMTI_CLASS_STATUS_INITIALIZED;
2625 }
2626 if (is_in_error_state()) {
2627 result |= JVMTI_CLASS_STATUS_ERROR;
2628 }
2629 return result;
2630 }
2631
2632 Method* InstanceKlass::method_at_itable(Klass* holder, int index, TRAPS) {
2633 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2634 int method_table_offset_in_words = ioe->offset()/wordSize;
2635 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
2636 / itableOffsetEntry::size();
2637
2638 for (int cnt = 0 ; ; cnt ++, ioe ++) {
2639 // If the interface isn't implemented by the receiver class,
2640 // the VM should throw IncompatibleClassChangeError.
2641 if (cnt >= nof_interfaces) {
2642 THROW_NULL(vmSymbols::java_lang_IncompatibleClassChangeError());
2643 }
2644
2645 Klass* ik = ioe->interface_klass();
2646 if (ik == holder) break;
2647 }
2648
2649 itableMethodEntry* ime = ioe->first_method_entry(this);
2650 Method* m = ime[index].method();
2651 if (m == NULL) {
2652 THROW_NULL(vmSymbols::java_lang_AbstractMethodError());
2653 }
2654 return m;
2655 }
2656
2657
2658 #if INCLUDE_JVMTI
2659 // update default_methods for redefineclasses for methods that are
2660 // not yet in the vtable due to concurrent subclass define and superinterface
2661 // redefinition
2662 // Note: those in the vtable, should have been updated via adjust_method_entries
2663 void InstanceKlass::adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed) {
2664 // search the default_methods for uses of either obsolete or EMCP methods
2665 if (default_methods() != NULL) {
2666 for (int index = 0; index < default_methods()->length(); index ++) {
2667 Method* old_method = default_methods()->at(index);
2668 if (old_method == NULL || old_method->method_holder() != holder || !old_method->is_old()) {
2669 continue; // skip uninteresting entries
2670 }
2671 assert(!old_method->is_deleted(), "default methods may not be deleted");
2672
2673 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum());
2674
2675 assert(new_method != NULL, "method_with_idnum() should not be NULL");
2676 assert(old_method != new_method, "sanity check");
2677
2678 default_methods()->at_put(index, new_method);
2679 if (log_is_enabled(Info, redefine, class, update)) {
2680 ResourceMark rm;
2681 if (!(*trace_name_printed)) {
2682 log_info(redefine, class, update)
2683 ("adjust: klassname=%s default methods from name=%s",
2684 external_name(), old_method->method_holder()->external_name());
2685 *trace_name_printed = true;
2686 }
2687 log_debug(redefine, class, update, vtables)
2688 ("default method update: %s(%s) ",
2689 new_method->name()->as_C_string(), new_method->signature()->as_C_string());
2690 }
2691 }
2692 }
2693 }
2694 #endif // INCLUDE_JVMTI
2695
2696 // On-stack replacement stuff
2697 void InstanceKlass::add_osr_nmethod(nmethod* n) {
2698 // only one compilation can be active
2699 {
2700 // This is a short non-blocking critical region, so the no safepoint check is ok.
2701 MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
2702 assert(n->is_osr_method(), "wrong kind of nmethod");
2703 n->set_osr_link(osr_nmethods_head());
2704 set_osr_nmethods_head(n);
2705 // Raise the highest osr level if necessary
2706 if (TieredCompilation) {
2707 Method* m = n->method();
2708 m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level()));
2709 }
2710 }
2711
2712 // Get rid of the osr methods for the same bci that have lower levels.
2713 if (TieredCompilation) {
2714 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) {
2715 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true);
2716 if (inv != NULL && inv->is_in_use()) {
2717 inv->make_not_entrant();
2718 }
2719 }
2720 }
2721 }
2722
2723 // Remove osr nmethod from the list. Return true if found and removed.
2724 bool InstanceKlass::remove_osr_nmethod(nmethod* n) {
2725 // This is a short non-blocking critical region, so the no safepoint check is ok.
2726 MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
2727 assert(n->is_osr_method(), "wrong kind of nmethod");
2728 nmethod* last = NULL;
2729 nmethod* cur = osr_nmethods_head();
2730 int max_level = CompLevel_none; // Find the max comp level excluding n
2731 Method* m = n->method();
2732 // Search for match
2733 bool found = false;
2734 while(cur != NULL && cur != n) {
2735 if (TieredCompilation && m == cur->method()) {
2736 // Find max level before n
2737 max_level = MAX2(max_level, cur->comp_level());
2738 }
2739 last = cur;
2740 cur = cur->osr_link();
2741 }
2742 nmethod* next = NULL;
2743 if (cur == n) {
2744 found = true;
2745 next = cur->osr_link();
2746 if (last == NULL) {
2747 // Remove first element
2748 set_osr_nmethods_head(next);
2749 } else {
2750 last->set_osr_link(next);
2751 }
2752 }
2753 n->set_osr_link(NULL);
2754 if (TieredCompilation) {
2755 cur = next;
2756 while (cur != NULL) {
2757 // Find max level after n
2758 if (m == cur->method()) {
2759 max_level = MAX2(max_level, cur->comp_level());
2760 }
2761 cur = cur->osr_link();
2762 }
2763 m->set_highest_osr_comp_level(max_level);
2764 }
2765 return found;
2766 }
2767
2768 int InstanceKlass::mark_osr_nmethods(const Method* m) {
2769 // This is a short non-blocking critical region, so the no safepoint check is ok.
2770 MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
2771 nmethod* osr = osr_nmethods_head();
2772 int found = 0;
2773 while (osr != NULL) {
2774 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
2775 if (osr->method() == m) {
2776 osr->mark_for_deoptimization();
2777 found++;
2778 }
2779 osr = osr->osr_link();
2780 }
2781 return found;
2782 }
2783
2784 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
2785 // This is a short non-blocking critical region, so the no safepoint check is ok.
2786 MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
2787 nmethod* osr = osr_nmethods_head();
2788 nmethod* best = NULL;
2789 while (osr != NULL) {
2790 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
2791 // There can be a time when a c1 osr method exists but we are waiting
2792 // for a c2 version. When c2 completes its osr nmethod we will trash
2793 // the c1 version and only be able to find the c2 version. However
2794 // while we overflow in the c1 code at back branches we don't want to
2795 // try and switch to the same code as we are already running
2796
2797 if (osr->method() == m &&
2798 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
2799 if (match_level) {
2800 if (osr->comp_level() == comp_level) {
2801 // Found a match - return it.
2802 return osr;
2803 }
2804 } else {
2805 if (best == NULL || (osr->comp_level() > best->comp_level())) {
2806 if (osr->comp_level() == CompLevel_highest_tier) {
2807 // Found the best possible - return it.
2808 return osr;
2809 }
2810 best = osr;
2811 }
2812 }
2813 }
2814 osr = osr->osr_link();
2815 }
2816 if (best != NULL && best->comp_level() >= comp_level && match_level == false) {
2817 return best;
2818 }
2819 return NULL;
2820 }
2821
2822 // -----------------------------------------------------------------------------------------------------
2823 // Printing
2824
2825 #ifndef PRODUCT
2826
2827 #define BULLET " - "
2828
2829 static const char* state_names[] = {
2830 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
2831 };
2832
2833 static void print_vtable(intptr_t* start, int len, outputStream* st) {
2834 for (int i = 0; i < len; i++) {
2835 intptr_t e = start[i];
2836 st->print("%d : " INTPTR_FORMAT, i, e);
2837 if (e != 0 && ((Metadata*)e)->is_metaspace_object()) {
2838 st->print(" ");
2839 ((Metadata*)e)->print_value_on(st);
2840 }
2841 st->cr();
2842 }
2843 }
2844
2845 static void print_vtable(vtableEntry* start, int len, outputStream* st) {
2846 return print_vtable(reinterpret_cast<intptr_t*>(start), len, st);
2847 }
2848
2849 void InstanceKlass::print_on(outputStream* st) const {
2850 assert(is_klass(), "must be klass");
2851 Klass::print_on(st);
2852
2853 st->print(BULLET"instance size: %d", size_helper()); st->cr();
2854 st->print(BULLET"klass size: %d", size()); st->cr();
2855 st->print(BULLET"access: "); access_flags().print_on(st); st->cr();
2856 st->print(BULLET"state: "); st->print_cr("%s", state_names[_init_state]);
2857 st->print(BULLET"name: "); name()->print_value_on(st); st->cr();
2858 st->print(BULLET"super: "); super()->print_value_on_maybe_null(st); st->cr();
2859 st->print(BULLET"sub: ");
2860 Klass* sub = subklass();
2861 int n;
2862 for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) {
2863 if (n < MaxSubklassPrintSize) {
2864 sub->print_value_on(st);
2865 st->print(" ");
2866 }
2867 }
2868 if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize);
2869 st->cr();
2870
2871 if (is_interface()) {
2872 st->print_cr(BULLET"nof implementors: %d", nof_implementors());
2873 if (nof_implementors() == 1) {
2874 st->print_cr(BULLET"implementor: ");
2875 st->print(" ");
2876 implementor()->print_value_on(st);
2877 st->cr();
2878 }
2879 }
2880
2881 st->print(BULLET"arrays: "); array_klasses()->print_value_on_maybe_null(st); st->cr();
2882 st->print(BULLET"methods: "); methods()->print_value_on(st); st->cr();
2883 if (Verbose || WizardMode) {
2884 Array<Method*>* method_array = methods();
2885 for (int i = 0; i < method_array->length(); i++) {
2886 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
2887 }
2888 }
2889 st->print(BULLET"method ordering: "); method_ordering()->print_value_on(st); st->cr();
2890 st->print(BULLET"default_methods: "); default_methods()->print_value_on(st); st->cr();
2891 if (Verbose && default_methods() != NULL) {
2892 Array<Method*>* method_array = default_methods();
2893 for (int i = 0; i < method_array->length(); i++) {
2894 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
2895 }
2896 }
2897 if (default_vtable_indices() != NULL) {
2898 st->print(BULLET"default vtable indices: "); default_vtable_indices()->print_value_on(st); st->cr();
2899 }
2900 st->print(BULLET"local interfaces: "); local_interfaces()->print_value_on(st); st->cr();
2901 st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr();
2902 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr();
2903 if (class_loader_data() != NULL) {
2904 st->print(BULLET"class loader data: ");
2905 class_loader_data()->print_value_on(st);
2906 st->cr();
2907 }
2908 st->print(BULLET"host class: "); host_klass()->print_value_on_maybe_null(st); st->cr();
2909 if (source_file_name() != NULL) {
2910 st->print(BULLET"source file: ");
2911 source_file_name()->print_value_on(st);
2912 st->cr();
2913 }
2914 if (source_debug_extension() != NULL) {
2915 st->print(BULLET"source debug extension: ");
2916 st->print("%s", source_debug_extension());
2917 st->cr();
2918 }
2919 st->print(BULLET"class annotations: "); class_annotations()->print_value_on(st); st->cr();
2920 st->print(BULLET"class type annotations: "); class_type_annotations()->print_value_on(st); st->cr();
2921 st->print(BULLET"field annotations: "); fields_annotations()->print_value_on(st); st->cr();
2922 st->print(BULLET"field type annotations: "); fields_type_annotations()->print_value_on(st); st->cr();
2923 {
2924 bool have_pv = false;
2925 // previous versions are linked together through the InstanceKlass
2926 for (InstanceKlass* pv_node = previous_versions();
2927 pv_node != NULL;
2928 pv_node = pv_node->previous_versions()) {
2929 if (!have_pv)
2930 st->print(BULLET"previous version: ");
2931 have_pv = true;
2932 pv_node->constants()->print_value_on(st);
2933 }
2934 if (have_pv) st->cr();
2935 }
2936
2937 if (generic_signature() != NULL) {
2938 st->print(BULLET"generic signature: ");
2939 generic_signature()->print_value_on(st);
2940 st->cr();
2941 }
2942 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr();
2943 st->print(BULLET"java mirror: "); java_mirror()->print_value_on(st); st->cr();
2944 st->print(BULLET"vtable length %d (start addr: " INTPTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
2945 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st);
2946 st->print(BULLET"itable length %d (start addr: " INTPTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
2947 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_itable(), itable_length(), st);
2948 st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
2949 FieldPrinter print_static_field(st);
2950 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
2951 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
2952 FieldPrinter print_nonstatic_field(st);
2953 InstanceKlass* ik = const_cast<InstanceKlass*>(this);
2954 ik->do_nonstatic_fields(&print_nonstatic_field);
2955
2956 st->print(BULLET"non-static oop maps: ");
2957 OopMapBlock* map = start_of_nonstatic_oop_maps();
2958 OopMapBlock* end_map = map + nonstatic_oop_map_count();
2959 while (map < end_map) {
2960 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
2961 map++;
2962 }
2963 st->cr();
2964 }
2965
2966 #endif //PRODUCT
2967
2968 void InstanceKlass::print_value_on(outputStream* st) const {
2969 assert(is_klass(), "must be klass");
2970 if (Verbose || WizardMode) access_flags().print_on(st);
2971 name()->print_value_on(st);
2972 }
2973
2974 #ifndef PRODUCT
2975
2976 void FieldPrinter::do_field(fieldDescriptor* fd) {
2977 _st->print(BULLET);
2978 if (_obj == NULL) {
2979 fd->print_on(_st);
2980 _st->cr();
2981 } else {
2982 fd->print_on_for(_st, _obj);
2983 _st->cr();
2984 }
2985 }
2986
2987
2988 void InstanceKlass::oop_print_on(oop obj, outputStream* st) {
2989 Klass::oop_print_on(obj, st);
2990
2991 if (this == SystemDictionary::String_klass()) {
2992 typeArrayOop value = java_lang_String::value(obj);
2993 juint length = java_lang_String::length(obj);
2994 if (value != NULL &&
2995 value->is_typeArray() &&
2996 length <= (juint) value->length()) {
2997 st->print(BULLET"string: ");
2998 java_lang_String::print(obj, st);
2999 st->cr();
3000 if (!WizardMode) return; // that is enough
3001 }
3002 }
3003
3004 st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj));
3005 FieldPrinter print_field(st, obj);
3006 do_nonstatic_fields(&print_field);
3007
3008 if (this == SystemDictionary::Class_klass()) {
3009 st->print(BULLET"signature: ");
3010 java_lang_Class::print_signature(obj, st);
3011 st->cr();
3012 Klass* mirrored_klass = java_lang_Class::as_Klass(obj);
3013 st->print(BULLET"fake entry for mirror: ");
3014 mirrored_klass->print_value_on_maybe_null(st);
3015 st->cr();
3016 Klass* array_klass = java_lang_Class::array_klass_acquire(obj);
3017 st->print(BULLET"fake entry for array: ");
3018 array_klass->print_value_on_maybe_null(st);
3019 st->cr();
3020 st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj));
3021 st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj));
3022 Klass* real_klass = java_lang_Class::as_Klass(obj);
3023 if (real_klass != NULL && real_klass->is_instance_klass()) {
3024 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
3025 }
3026 } else if (this == SystemDictionary::MethodType_klass()) {
3027 st->print(BULLET"signature: ");
3028 java_lang_invoke_MethodType::print_signature(obj, st);
3029 st->cr();
3030 }
3031 }
3032
3033 #endif //PRODUCT
3034
3035 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
3036 st->print("a ");
3037 name()->print_value_on(st);
3038 obj->print_address_on(st);
3039 if (this == SystemDictionary::String_klass()
3040 && java_lang_String::value(obj) != NULL) {
3041 ResourceMark rm;
3042 int len = java_lang_String::length(obj);
3043 int plen = (len < 24 ? len : 12);
3044 char* str = java_lang_String::as_utf8_string(obj, 0, plen);
3045 st->print(" = \"%s\"", str);
3046 if (len > plen)
3047 st->print("...[%d]", len);
3048 } else if (this == SystemDictionary::Class_klass()) {
3049 Klass* k = java_lang_Class::as_Klass(obj);
3050 st->print(" = ");
3051 if (k != NULL) {
3052 k->print_value_on(st);
3053 } else {
3054 const char* tname = type2name(java_lang_Class::primitive_type(obj));
3055 st->print("%s", tname ? tname : "type?");
3056 }
3057 } else if (this == SystemDictionary::MethodType_klass()) {
3058 st->print(" = ");
3059 java_lang_invoke_MethodType::print_signature(obj, st);
3060 } else if (java_lang_boxing_object::is_instance(obj)) {
3061 st->print(" = ");
3062 java_lang_boxing_object::print(obj, st);
3063 } else if (this == SystemDictionary::LambdaForm_klass()) {
3064 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
3065 if (vmentry != NULL) {
3066 st->print(" => ");
3067 vmentry->print_value_on(st);
3068 }
3069 } else if (this == SystemDictionary::MemberName_klass()) {
3070 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
3071 if (vmtarget != NULL) {
3072 st->print(" = ");
3073 vmtarget->print_value_on(st);
3074 } else {
3075 java_lang_invoke_MemberName::clazz(obj)->print_value_on(st);
3076 st->print(".");
3077 java_lang_invoke_MemberName::name(obj)->print_value_on(st);
3078 }
3079 }
3080 }
3081
3082 const char* InstanceKlass::internal_name() const {
3083 return external_name();
3084 }
3085
3086 void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data,
3087 const char* module_name,
3088 const ClassFileStream* cfs) const {
3089 if (!log_is_enabled(Info, class, load)) {
3090 return;
3091 }
3092
3093 ResourceMark rm;
3094 LogMessage(class, load) msg;
3095 stringStream info_stream;
3096
3097 // Name and class hierarchy info
3098 info_stream.print("%s", external_name());
3099
3100 // Source
3101 if (cfs != NULL) {
3102 if (cfs->source() != NULL) {
3103 if (module_name != NULL) {
3104 if (ClassLoader::is_modules_image(cfs->source())) {
3105 info_stream.print(" source: jrt:/%s", module_name);
3106 } else {
3107 info_stream.print(" source: %s", cfs->source());
3108 }
3109 } else {
3110 info_stream.print(" source: %s", cfs->source());
3111 }
3112 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) {
3113 Thread* THREAD = Thread::current();
3114 Klass* caller =
3115 THREAD->is_Java_thread()
3116 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
3117 : NULL;
3118 // caller can be NULL, for example, during a JVMTI VM_Init hook
3119 if (caller != NULL) {
3120 info_stream.print(" source: instance of %s", caller->external_name());
3121 } else {
3122 // source is unknown
3123 }
3124 } else {
3125 oop class_loader = loader_data->class_loader();
3126 info_stream.print(" source: %s", class_loader->klass()->external_name());
3127 }
3128 } else {
3129 info_stream.print(" source: shared objects file");
3130 }
3131
3132 msg.info("%s", info_stream.as_string());
3133
3134 if (log_is_enabled(Debug, class, load)) {
3135 stringStream debug_stream;
3136
3137 // Class hierarchy info
3138 debug_stream.print(" klass: " INTPTR_FORMAT " super: " INTPTR_FORMAT,
3139 p2i(this), p2i(superklass()));
3140
3141 // Interfaces
3142 if (local_interfaces() != NULL && local_interfaces()->length() > 0) {
3143 debug_stream.print(" interfaces:");
3144 int length = local_interfaces()->length();
3145 for (int i = 0; i < length; i++) {
3146 debug_stream.print(" " INTPTR_FORMAT,
3147 p2i(InstanceKlass::cast(local_interfaces()->at(i))));
3148 }
3149 }
3150
3151 // Class loader
3152 debug_stream.print(" loader: [");
3153 loader_data->print_value_on(&debug_stream);
3154 debug_stream.print("]");
3155
3156 // Classfile checksum
3157 if (cfs) {
3158 debug_stream.print(" bytes: %d checksum: %08x",
3159 cfs->length(),
3160 ClassLoader::crc32(0, (const char*)cfs->buffer(),
3161 cfs->length()));
3162 }
3163
3164 msg.debug("%s", debug_stream.as_string());
3165 }
3166 }
3167
3168 #if INCLUDE_SERVICES
3169 // Size Statistics
3170 void InstanceKlass::collect_statistics(KlassSizeStats *sz) const {
3171 Klass::collect_statistics(sz);
3172
3173 sz->_inst_size = wordSize * size_helper();
3174 sz->_vtab_bytes = wordSize * vtable_length();
3175 sz->_itab_bytes = wordSize * itable_length();
3176 sz->_nonstatic_oopmap_bytes = wordSize * nonstatic_oop_map_size();
3177
3178 int n = 0;
3179 n += (sz->_methods_array_bytes = sz->count_array(methods()));
3180 n += (sz->_method_ordering_bytes = sz->count_array(method_ordering()));
3181 n += (sz->_local_interfaces_bytes = sz->count_array(local_interfaces()));
3182 n += (sz->_transitive_interfaces_bytes = sz->count_array(transitive_interfaces()));
3183 n += (sz->_fields_bytes = sz->count_array(fields()));
3184 n += (sz->_inner_classes_bytes = sz->count_array(inner_classes()));
3185 sz->_ro_bytes += n;
3186
3187 const ConstantPool* cp = constants();
3188 if (cp) {
3189 cp->collect_statistics(sz);
3190 }
3191
3192 const Annotations* anno = annotations();
3193 if (anno) {
3194 anno->collect_statistics(sz);
3195 }
3196
3197 const Array<Method*>* methods_array = methods();
3198 if (methods()) {
3199 for (int i = 0; i < methods_array->length(); i++) {
3200 Method* method = methods_array->at(i);
3201 if (method) {
3202 sz->_method_count ++;
3203 method->collect_statistics(sz);
3204 }
3205 }
3206 }
3207 }
3208 #endif // INCLUDE_SERVICES
3209
3210 // Verification
3211
3212 class VerifyFieldClosure: public OopClosure {
3213 protected:
3214 template <class T> void do_oop_work(T* p) {
3215 oop obj = RawAccess<>::oop_load(p);
3216 if (!oopDesc::is_oop_or_null(obj)) {
3217 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj));
3218 Universe::print_on(tty);
3219 guarantee(false, "boom");
3220 }
3221 }
3222 public:
3223 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); }
3224 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
3225 };
3226
3227 void InstanceKlass::verify_on(outputStream* st) {
3228 #ifndef PRODUCT
3229 // Avoid redundant verifies, this really should be in product.
3230 if (_verify_count == Universe::verify_count()) return;
3231 _verify_count = Universe::verify_count();
3232 #endif
3233
3234 // Verify Klass
3235 Klass::verify_on(st);
3236
3237 // Verify that klass is present in ClassLoaderData
3238 guarantee(class_loader_data()->contains_klass(this),
3239 "this class isn't found in class loader data");
3240
3241 // Verify vtables
3242 if (is_linked()) {
3243 // $$$ This used to be done only for m/s collections. Doing it
3244 // always seemed a valid generalization. (DLD -- 6/00)
3245 vtable().verify(st);
3246 }
3247
3248 // Verify first subklass
3249 if (subklass() != NULL) {
3250 guarantee(subklass()->is_klass(), "should be klass");
3251 }
3252
3253 // Verify siblings
3254 Klass* super = this->super();
3255 Klass* sib = next_sibling();
3256 if (sib != NULL) {
3257 if (sib == this) {
3258 fatal("subclass points to itself " PTR_FORMAT, p2i(sib));
3259 }
3260
3261 guarantee(sib->is_klass(), "should be klass");
3262 guarantee(sib->super() == super, "siblings should have same superklass");
3263 }
3264
3265 // Verify implementor fields
3266 Klass* im = implementor();
3267 if (im != NULL) {
3268 guarantee(is_interface(), "only interfaces should have implementor set");
3269 guarantee(im->is_klass(), "should be klass");
3270 guarantee(!im->is_interface() || im == this,
3271 "implementors cannot be interfaces");
3272 }
3273
3274 // Verify local interfaces
3275 if (local_interfaces()) {
3276 Array<Klass*>* local_interfaces = this->local_interfaces();
3277 for (int j = 0; j < local_interfaces->length(); j++) {
3278 Klass* e = local_interfaces->at(j);
3279 guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
3280 }
3281 }
3282
3283 // Verify transitive interfaces
3284 if (transitive_interfaces() != NULL) {
3285 Array<Klass*>* transitive_interfaces = this->transitive_interfaces();
3286 for (int j = 0; j < transitive_interfaces->length(); j++) {
3287 Klass* e = transitive_interfaces->at(j);
3288 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
3289 }
3290 }
3291
3292 // Verify methods
3293 if (methods() != NULL) {
3294 Array<Method*>* methods = this->methods();
3295 for (int j = 0; j < methods->length(); j++) {
3296 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3297 }
3298 for (int j = 0; j < methods->length() - 1; j++) {
3299 Method* m1 = methods->at(j);
3300 Method* m2 = methods->at(j + 1);
3301 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3302 }
3303 }
3304
3305 // Verify method ordering
3306 if (method_ordering() != NULL) {
3307 Array<int>* method_ordering = this->method_ordering();
3308 int length = method_ordering->length();
3309 if (JvmtiExport::can_maintain_original_method_order() ||
3310 ((UseSharedSpaces || DumpSharedSpaces) && length != 0)) {
3311 guarantee(length == methods()->length(), "invalid method ordering length");
3312 jlong sum = 0;
3313 for (int j = 0; j < length; j++) {
3314 int original_index = method_ordering->at(j);
3315 guarantee(original_index >= 0, "invalid method ordering index");
3316 guarantee(original_index < length, "invalid method ordering index");
3317 sum += original_index;
3318 }
3319 // Verify sum of indices 0,1,...,length-1
3320 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
3321 } else {
3322 guarantee(length == 0, "invalid method ordering length");
3323 }
3324 }
3325
3326 // Verify default methods
3327 if (default_methods() != NULL) {
3328 Array<Method*>* methods = this->default_methods();
3329 for (int j = 0; j < methods->length(); j++) {
3330 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3331 }
3332 for (int j = 0; j < methods->length() - 1; j++) {
3333 Method* m1 = methods->at(j);
3334 Method* m2 = methods->at(j + 1);
3335 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3336 }
3337 }
3338
3339 // Verify JNI static field identifiers
3340 if (jni_ids() != NULL) {
3341 jni_ids()->verify(this);
3342 }
3343
3344 // Verify other fields
3345 if (array_klasses() != NULL) {
3346 guarantee(array_klasses()->is_klass(), "should be klass");
3347 }
3348 if (constants() != NULL) {
3349 guarantee(constants()->is_constantPool(), "should be constant pool");
3350 }
3351 const Klass* host = host_klass();
3352 if (host != NULL) {
3353 guarantee(host->is_klass(), "should be klass");
3354 }
3355 }
3356
3357 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
3358 Klass::oop_verify_on(obj, st);
3359 VerifyFieldClosure blk;
3360 obj->oop_iterate_no_header(&blk);
3361 }
3362
3363
3364 // JNIid class for jfieldIDs only
3365 // Note to reviewers:
3366 // These JNI functions are just moved over to column 1 and not changed
3367 // in the compressed oops workspace.
3368 JNIid::JNIid(Klass* holder, int offset, JNIid* next) {
3369 _holder = holder;
3370 _offset = offset;
3371 _next = next;
3372 debug_only(_is_static_field_id = false;)
3373 }
3374
3375
3376 JNIid* JNIid::find(int offset) {
3377 JNIid* current = this;
3378 while (current != NULL) {
3379 if (current->offset() == offset) return current;
3380 current = current->next();
3381 }
3382 return NULL;
3383 }
3384
3385 void JNIid::deallocate(JNIid* current) {
3386 while (current != NULL) {
3387 JNIid* next = current->next();
3388 delete current;
3389 current = next;
3390 }
3391 }
3392
3393
3394 void JNIid::verify(Klass* holder) {
3395 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields();
3396 int end_field_offset;
3397 end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize);
3398
3399 JNIid* current = this;
3400 while (current != NULL) {
3401 guarantee(current->holder() == holder, "Invalid klass in JNIid");
3402 #ifdef ASSERT
3403 int o = current->offset();
3404 if (current->is_static_field_id()) {
3405 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid");
3406 }
3407 #endif
3408 current = current->next();
3409 }
3410 }
3411
3412 oop InstanceKlass::holder_phantom() const {
3413 return class_loader_data()->holder_phantom();
3414 }
3415
3416 #ifdef ASSERT
3417 void InstanceKlass::set_init_state(ClassState state) {
3418 bool good_state = is_shared() ? (_init_state <= state)
3419 : (_init_state < state);
3420 assert(good_state || state == allocated, "illegal state transition");
3421 _init_state = (u1)state;
3422 }
3423 #endif
3424
3425 #if INCLUDE_JVMTI
3426
3427 // RedefineClasses() support for previous versions
3428
3429 // Globally, there is at least one previous version of a class to walk
3430 // during class unloading, which is saved because old methods in the class
3431 // are still running. Otherwise the previous version list is cleaned up.
3432 bool InstanceKlass::_has_previous_versions = false;
3433
3434 // Returns true if there are previous versions of a class for class
3435 // unloading only. Also resets the flag to false. purge_previous_version
3436 // will set the flag to true if there are any left, i.e., if there's any
3437 // work to do for next time. This is to avoid the expensive code cache
3438 // walk in CLDG::do_unloading().
3439 bool InstanceKlass::has_previous_versions_and_reset() {
3440 bool ret = _has_previous_versions;
3441 log_trace(redefine, class, iklass, purge)("Class unloading: has_previous_versions = %s",
3442 ret ? "true" : "false");
3443 _has_previous_versions = false;
3444 return ret;
3445 }
3446
3447 // Purge previous versions before adding new previous versions of the class and
3448 // during class unloading.
3449 void InstanceKlass::purge_previous_version_list() {
3450 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
3451 assert(has_been_redefined(), "Should only be called for main class");
3452
3453 // Quick exit.
3454 if (previous_versions() == NULL) {
3455 return;
3456 }
3457
3458 // This klass has previous versions so see what we can cleanup
3459 // while it is safe to do so.
3460
3461 int deleted_count = 0; // leave debugging breadcrumbs
3462 int live_count = 0;
3463 ClassLoaderData* loader_data = class_loader_data();
3464 assert(loader_data != NULL, "should never be null");
3465
3466 ResourceMark rm;
3467 log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name());
3468
3469 // previous versions are linked together through the InstanceKlass
3470 InstanceKlass* pv_node = previous_versions();
3471 InstanceKlass* last = this;
3472 int version = 0;
3473
3474 // check the previous versions list
3475 for (; pv_node != NULL; ) {
3476
3477 ConstantPool* pvcp = pv_node->constants();
3478 assert(pvcp != NULL, "cp ref was unexpectedly cleared");
3479
3480 if (!pvcp->on_stack()) {
3481 // If the constant pool isn't on stack, none of the methods
3482 // are executing. Unlink this previous_version.
3483 // The previous version InstanceKlass is on the ClassLoaderData deallocate list
3484 // so will be deallocated during the next phase of class unloading.
3485 log_trace(redefine, class, iklass, purge)
3486 ("previous version " INTPTR_FORMAT " is dead.", p2i(pv_node));
3487 // For debugging purposes.
3488 pv_node->set_is_scratch_class();
3489 // Unlink from previous version list.
3490 assert(pv_node->class_loader_data() == loader_data, "wrong loader_data");
3491 InstanceKlass* next = pv_node->previous_versions();
3492 pv_node->link_previous_versions(NULL); // point next to NULL
3493 last->link_previous_versions(next);
3494 // Add to the deallocate list after unlinking
3495 loader_data->add_to_deallocate_list(pv_node);
3496 pv_node = next;
3497 deleted_count++;
3498 version++;
3499 continue;
3500 } else {
3501 log_trace(redefine, class, iklass, purge)("previous version " INTPTR_FORMAT " is alive", p2i(pv_node));
3502 assert(pvcp->pool_holder() != NULL, "Constant pool with no holder");
3503 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
3504 live_count++;
3505 // found a previous version for next time we do class unloading
3506 _has_previous_versions = true;
3507 }
3508
3509 // At least one method is live in this previous version.
3510 // Reset dead EMCP methods not to get breakpoints.
3511 // All methods are deallocated when all of the methods for this class are no
3512 // longer running.
3513 Array<Method*>* method_refs = pv_node->methods();
3514 if (method_refs != NULL) {
3515 log_trace(redefine, class, iklass, purge)("previous methods length=%d", method_refs->length());
3516 for (int j = 0; j < method_refs->length(); j++) {
3517 Method* method = method_refs->at(j);
3518
3519 if (!method->on_stack()) {
3520 // no breakpoints for non-running methods
3521 if (method->is_running_emcp()) {
3522 method->set_running_emcp(false);
3523 }
3524 } else {
3525 assert (method->is_obsolete() || method->is_running_emcp(),
3526 "emcp method cannot run after emcp bit is cleared");
3527 log_trace(redefine, class, iklass, purge)
3528 ("purge: %s(%s): prev method @%d in version @%d is alive",
3529 method->name()->as_C_string(), method->signature()->as_C_string(), j, version);
3530 }
3531 }
3532 }
3533 // next previous version
3534 last = pv_node;
3535 pv_node = pv_node->previous_versions();
3536 version++;
3537 }
3538 log_trace(redefine, class, iklass, purge)
3539 ("previous version stats: live=%d, deleted=%d", live_count, deleted_count);
3540 }
3541
3542 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods,
3543 int emcp_method_count) {
3544 int obsolete_method_count = old_methods->length() - emcp_method_count;
3545
3546 if (emcp_method_count != 0 && obsolete_method_count != 0 &&
3547 _previous_versions != NULL) {
3548 // We have a mix of obsolete and EMCP methods so we have to
3549 // clear out any matching EMCP method entries the hard way.
3550 int local_count = 0;
3551 for (int i = 0; i < old_methods->length(); i++) {
3552 Method* old_method = old_methods->at(i);
3553 if (old_method->is_obsolete()) {
3554 // only obsolete methods are interesting
3555 Symbol* m_name = old_method->name();
3556 Symbol* m_signature = old_method->signature();
3557
3558 // previous versions are linked together through the InstanceKlass
3559 int j = 0;
3560 for (InstanceKlass* prev_version = _previous_versions;
3561 prev_version != NULL;
3562 prev_version = prev_version->previous_versions(), j++) {
3563
3564 Array<Method*>* method_refs = prev_version->methods();
3565 for (int k = 0; k < method_refs->length(); k++) {
3566 Method* method = method_refs->at(k);
3567
3568 if (!method->is_obsolete() &&
3569 method->name() == m_name &&
3570 method->signature() == m_signature) {
3571 // The current RedefineClasses() call has made all EMCP
3572 // versions of this method obsolete so mark it as obsolete
3573 log_trace(redefine, class, iklass, add)
3574 ("%s(%s): flush obsolete method @%d in version @%d",
3575 m_name->as_C_string(), m_signature->as_C_string(), k, j);
3576
3577 method->set_is_obsolete();
3578 break;
3579 }
3580 }
3581
3582 // The previous loop may not find a matching EMCP method, but
3583 // that doesn't mean that we can optimize and not go any
3584 // further back in the PreviousVersion generations. The EMCP
3585 // method for this generation could have already been made obsolete,
3586 // but there still may be an older EMCP method that has not
3587 // been made obsolete.
3588 }
3589
3590 if (++local_count >= obsolete_method_count) {
3591 // no more obsolete methods so bail out now
3592 break;
3593 }
3594 }
3595 }
3596 }
3597 }
3598
3599 // Save the scratch_class as the previous version if any of the methods are running.
3600 // The previous_versions are used to set breakpoints in EMCP methods and they are
3601 // also used to clean MethodData links to redefined methods that are no longer running.
3602 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class,
3603 int emcp_method_count) {
3604 assert(Thread::current()->is_VM_thread(),
3605 "only VMThread can add previous versions");
3606
3607 ResourceMark rm;
3608 log_trace(redefine, class, iklass, add)
3609 ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count);
3610
3611 // Clean out old previous versions for this class
3612 purge_previous_version_list();
3613
3614 // Mark newly obsolete methods in remaining previous versions. An EMCP method from
3615 // a previous redefinition may be made obsolete by this redefinition.
3616 Array<Method*>* old_methods = scratch_class->methods();
3617 mark_newly_obsolete_methods(old_methods, emcp_method_count);
3618
3619 // If the constant pool for this previous version of the class
3620 // is not marked as being on the stack, then none of the methods
3621 // in this previous version of the class are on the stack so
3622 // we don't need to add this as a previous version.
3623 ConstantPool* cp_ref = scratch_class->constants();
3624 if (!cp_ref->on_stack()) {
3625 log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running");
3626 // For debugging purposes.
3627 scratch_class->set_is_scratch_class();
3628 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class);
3629 return;
3630 }
3631
3632 if (emcp_method_count != 0) {
3633 // At least one method is still running, check for EMCP methods
3634 for (int i = 0; i < old_methods->length(); i++) {
3635 Method* old_method = old_methods->at(i);
3636 if (!old_method->is_obsolete() && old_method->on_stack()) {
3637 // if EMCP method (not obsolete) is on the stack, mark as EMCP so that
3638 // we can add breakpoints for it.
3639
3640 // We set the method->on_stack bit during safepoints for class redefinition
3641 // and use this bit to set the is_running_emcp bit.
3642 // After the safepoint, the on_stack bit is cleared and the running emcp
3643 // method may exit. If so, we would set a breakpoint in a method that
3644 // is never reached, but this won't be noticeable to the programmer.
3645 old_method->set_running_emcp(true);
3646 log_trace(redefine, class, iklass, add)
3647 ("EMCP method %s is on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
3648 } else if (!old_method->is_obsolete()) {
3649 log_trace(redefine, class, iklass, add)
3650 ("EMCP method %s is NOT on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
3651 }
3652 }
3653 }
3654
3655 // Add previous version if any methods are still running.
3656 // Set has_previous_version flag for processing during class unloading.
3657 _has_previous_versions = true;
3658 log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack.");
3659 assert(scratch_class->previous_versions() == NULL, "shouldn't have a previous version");
3660 scratch_class->link_previous_versions(previous_versions());
3661 link_previous_versions(scratch_class);
3662 } // end add_previous_version()
3663
3664 #endif // INCLUDE_JVMTI
3665
3666 Method* InstanceKlass::method_with_idnum(int idnum) {
3667 Method* m = NULL;
3668 if (idnum < methods()->length()) {
3669 m = methods()->at(idnum);
3670 }
3671 if (m == NULL || m->method_idnum() != idnum) {
3672 for (int index = 0; index < methods()->length(); ++index) {
3673 m = methods()->at(index);
3674 if (m->method_idnum() == idnum) {
3675 return m;
3676 }
3677 }
3678 // None found, return null for the caller to handle.
3679 return NULL;
3680 }
3681 return m;
3682 }
3683
3684
3685 Method* InstanceKlass::method_with_orig_idnum(int idnum) {
3686 if (idnum >= methods()->length()) {
3687 return NULL;
3688 }
3689 Method* m = methods()->at(idnum);
3690 if (m != NULL && m->orig_method_idnum() == idnum) {
3691 return m;
3692 }
3693 // Obsolete method idnum does not match the original idnum
3694 for (int index = 0; index < methods()->length(); ++index) {
3695 m = methods()->at(index);
3696 if (m->orig_method_idnum() == idnum) {
3697 return m;
3698 }
3699 }
3700 // None found, return null for the caller to handle.
3701 return NULL;
3702 }
3703
3704
3705 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) {
3706 InstanceKlass* holder = get_klass_version(version);
3707 if (holder == NULL) {
3708 return NULL; // The version of klass is gone, no method is found
3709 }
3710 Method* method = holder->method_with_orig_idnum(idnum);
3711 return method;
3712 }
3713
3714 #if INCLUDE_JVMTI
3715 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() {
3716 if (MetaspaceShared::is_in_shared_metaspace(_cached_class_file)) {
3717 // Ignore the archived class stream data
3718 return NULL;
3719 } else {
3720 return _cached_class_file;
3721 }
3722 }
3723
3724 jint InstanceKlass::get_cached_class_file_len() {
3725 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
3726 }
3727
3728 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
3729 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
3730 }
3731
3732 #if INCLUDE_CDS
3733 JvmtiCachedClassFileData* InstanceKlass::get_archived_class_data() {
3734 if (DumpSharedSpaces) {
3735 return _cached_class_file;
3736 } else {
3737 assert(this->is_shared(), "class should be shared");
3738 if (MetaspaceShared::is_in_shared_metaspace(_cached_class_file)) {
3739 return _cached_class_file;
3740 } else {
3741 return NULL;
3742 }
3743 }
3744 }
3745 #endif
3746 #endif