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 "classfile/javaClasses.hpp"
27 #include "classfile/dictionary.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "gc_implementation/shared/markSweep.inline.hpp"
31 #include "gc_interface/collectedHeap.inline.hpp"
32 #include "memory/heapInspection.hpp"
33 #include "memory/metadataFactory.hpp"
34 #include "memory/oopFactory.hpp"
35 #include "memory/resourceArea.hpp"
36 #include "oops/instanceKlass.hpp"
37 #include "oops/klass.inline.hpp"
38 #include "oops/oop.inline2.hpp"
39 #include "runtime/atomic.inline.hpp"
40 #include "runtime/orderAccess.inline.hpp"
41 #include "trace/traceMacros.hpp"
42 #include "utilities/stack.hpp"
43 #include "utilities/macros.hpp"
44 #if INCLUDE_ALL_GCS
45 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
46 #include "gc_implementation/parallelScavenge/psParallelCompact.hpp"
47 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp"
48 #include "gc_implementation/parallelScavenge/psScavenge.hpp"
49 #endif // INCLUDE_ALL_GCS
50
51 bool Klass::is_cloneable() const {
52 return _access_flags.is_cloneable() ||
53 is_subtype_of(SystemDictionary::Cloneable_klass());
54 }
55
56 void Klass::set_is_cloneable() {
57 if (oop_is_instance() && InstanceKlass::cast(this)->reference_type() != REF_NONE) {
58 // Reference cloning should not be intrinsified and always happen in JVM_Clone.
59 } else {
60 _access_flags.set_is_cloneable();
61 }
62 }
63
64 void Klass::set_name(Symbol* n) {
65 _name = n;
66 if (_name != NULL) _name->increment_refcount();
67 }
68
69 bool Klass::is_subclass_of(const Klass* k) const {
70 // Run up the super chain and check
71 if (this == k) return true;
72
73 Klass* t = const_cast<Klass*>(this)->super();
74
75 while (t != NULL) {
76 if (t == k) return true;
77 t = t->super();
78 }
79 return false;
80 }
81
82 bool Klass::search_secondary_supers(Klass* k) const {
83 // Put some extra logic here out-of-line, before the search proper.
84 // This cuts down the size of the inline method.
85
86 // This is necessary, since I am never in my own secondary_super list.
87 if (this == k)
88 return true;
89 // Scan the array-of-objects for a match
90 int cnt = secondary_supers()->length();
91 for (int i = 0; i < cnt; i++) {
92 if (secondary_supers()->at(i) == k) {
93 ((Klass*)this)->set_secondary_super_cache(k);
94 return true;
95 }
96 }
97 return false;
98 }
99
100 // Return self, except for abstract classes with exactly 1
101 // implementor. Then return the 1 concrete implementation.
102 Klass *Klass::up_cast_abstract() {
103 Klass *r = this;
104 while( r->is_abstract() ) { // Receiver is abstract?
105 Klass *s = r->subklass(); // Check for exactly 1 subklass
106 if( !s || s->next_sibling() ) // Oops; wrong count; give up
107 return this; // Return 'this' as a no-progress flag
108 r = s; // Loop till find concrete class
109 }
110 return r; // Return the 1 concrete class
111 }
112
113 // Find LCA in class hierarchy
114 Klass *Klass::LCA( Klass *k2 ) {
115 Klass *k1 = this;
116 while( 1 ) {
117 if( k1->is_subtype_of(k2) ) return k2;
118 if( k2->is_subtype_of(k1) ) return k1;
119 k1 = k1->super();
120 k2 = k2->super();
121 }
122 }
123
124
125 void Klass::check_valid_for_instantiation(bool throwError, TRAPS) {
126 ResourceMark rm(THREAD);
127 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
128 : vmSymbols::java_lang_InstantiationException(), external_name());
129 }
130
131
132 void Klass::copy_array(arrayOop s, int src_pos, arrayOop d, int dst_pos, int length, TRAPS) {
133 THROW(vmSymbols::java_lang_ArrayStoreException());
134 }
135
136
137 void Klass::initialize(TRAPS) {
138 ShouldNotReachHere();
139 }
140
141 bool Klass::compute_is_subtype_of(Klass* k) {
142 assert(k->is_klass(), "argument must be a class");
143 return is_subclass_of(k);
144 }
145
146 Klass* Klass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
147 #ifdef ASSERT
148 tty->print_cr("Error: find_field called on a klass oop."
149 " Likely error: reflection method does not correctly"
150 " wrap return value in a mirror object.");
151 #endif
152 ShouldNotReachHere();
153 return NULL;
154 }
155
156 Method* Klass::uncached_lookup_method(Symbol* name, Symbol* signature, OverpassLookupMode overpass_mode) const {
157 #ifdef ASSERT
158 tty->print_cr("Error: uncached_lookup_method called on a klass oop."
159 " Likely error: reflection method does not correctly"
160 " wrap return value in a mirror object.");
161 #endif
162 ShouldNotReachHere();
163 return NULL;
164 }
165
166 void* Klass::operator new(size_t size, ClassLoaderData* loader_data, size_t word_size, TRAPS) throw() {
167 return Metaspace::allocate(loader_data, word_size, /*read_only*/false,
168 MetaspaceObj::ClassType, CHECK_NULL);
169 }
170
171 Klass::Klass() {
172 Klass* k = this;
173
174 // Preinitialize supertype information.
175 // A later call to initialize_supers() may update these settings:
176 set_super(NULL);
177 for (juint i = 0; i < Klass::primary_super_limit(); i++) {
178 _primary_supers[i] = NULL;
179 }
180 set_secondary_supers(NULL);
181 set_secondary_super_cache(NULL);
182 _primary_supers[0] = k;
183 set_super_check_offset(in_bytes(primary_supers_offset()));
184
185 // The constructor is used from init_self_patching_vtbl_list,
186 // which doesn't zero out the memory before calling the constructor.
187 // Need to set the field explicitly to not hit an assert that the field
188 // should be NULL before setting it.
189 _java_mirror = NULL;
190
191 set_modifier_flags(0);
192 set_layout_helper(Klass::_lh_neutral_value);
193 set_name(NULL);
194 AccessFlags af;
195 af.set_flags(0);
196 set_access_flags(af);
197 set_subklass(NULL);
198 set_next_sibling(NULL);
199 set_next_link(NULL);
200 TRACE_INIT_ID(this);
201
202 set_prototype_header(markOopDesc::prototype());
203 set_biased_lock_revocation_count(0);
204 set_last_biased_lock_bulk_revocation_time(0);
205
206 // The klass doesn't have any references at this point.
207 clear_modified_oops();
208 clear_accumulated_modified_oops();
209 _shared_class_path_index = -1;
210 }
211
212 jint Klass::array_layout_helper(BasicType etype) {
213 assert(etype >= T_BOOLEAN && etype <= T_OBJECT, "valid etype");
214 // Note that T_ARRAY is not allowed here.
215 int hsize = arrayOopDesc::base_offset_in_bytes(etype);
216 int esize = type2aelembytes(etype);
217 bool isobj = (etype == T_OBJECT);
218 int tag = isobj ? _lh_array_tag_obj_value : _lh_array_tag_type_value;
219 int lh = array_layout_helper(tag, hsize, etype, exact_log2(esize));
220
221 assert(lh < (int)_lh_neutral_value, "must look like an array layout");
222 assert(layout_helper_is_array(lh), "correct kind");
223 assert(layout_helper_is_objArray(lh) == isobj, "correct kind");
224 assert(layout_helper_is_typeArray(lh) == !isobj, "correct kind");
225 assert(layout_helper_header_size(lh) == hsize, "correct decode");
226 assert(layout_helper_element_type(lh) == etype, "correct decode");
227 assert(1 << layout_helper_log2_element_size(lh) == esize, "correct decode");
228
229 return lh;
230 }
231
232 bool Klass::can_be_primary_super_slow() const {
233 if (super() == NULL)
234 return true;
235 else if (super()->super_depth() >= primary_super_limit()-1)
236 return false;
237 else
238 return true;
239 }
240
241 void Klass::initialize_supers(Klass* k, TRAPS) {
242 if (FastSuperclassLimit == 0) {
243 // None of the other machinery matters.
244 set_super(k);
245 return;
246 }
247 if (k == NULL) {
248 set_super(NULL);
249 _primary_supers[0] = this;
250 assert(super_depth() == 0, "Object must already be initialized properly");
251 } else if (k != super() || k == SystemDictionary::Object_klass()) {
252 assert(super() == NULL || super() == SystemDictionary::Object_klass(),
253 "initialize this only once to a non-trivial value");
254 set_super(k);
255 Klass* sup = k;
256 int sup_depth = sup->super_depth();
257 juint my_depth = MIN2(sup_depth + 1, (int)primary_super_limit());
258 if (!can_be_primary_super_slow())
259 my_depth = primary_super_limit();
260 for (juint i = 0; i < my_depth; i++) {
261 _primary_supers[i] = sup->_primary_supers[i];
262 }
263 Klass* *super_check_cell;
264 if (my_depth < primary_super_limit()) {
265 _primary_supers[my_depth] = this;
266 super_check_cell = &_primary_supers[my_depth];
267 } else {
268 // Overflow of the primary_supers array forces me to be secondary.
269 super_check_cell = &_secondary_super_cache;
270 }
271 set_super_check_offset((address)super_check_cell - (address) this);
272
273 #ifdef ASSERT
274 {
275 juint j = super_depth();
276 assert(j == my_depth, "computed accessor gets right answer");
277 Klass* t = this;
278 while (!t->can_be_primary_super()) {
279 t = t->super();
280 j = t->super_depth();
281 }
282 for (juint j1 = j+1; j1 < primary_super_limit(); j1++) {
283 assert(primary_super_of_depth(j1) == NULL, "super list padding");
284 }
285 while (t != NULL) {
286 assert(primary_super_of_depth(j) == t, "super list initialization");
287 t = t->super();
288 --j;
289 }
290 assert(j == (juint)-1, "correct depth count");
291 }
292 #endif
293 }
294
295 if (secondary_supers() == NULL) {
296 KlassHandle this_kh (THREAD, this);
297
298 // Now compute the list of secondary supertypes.
299 // Secondaries can occasionally be on the super chain,
300 // if the inline "_primary_supers" array overflows.
301 int extras = 0;
302 Klass* p;
303 for (p = super(); !(p == NULL || p->can_be_primary_super()); p = p->super()) {
304 ++extras;
305 }
306
307 ResourceMark rm(THREAD); // need to reclaim GrowableArrays allocated below
308
309 // Compute the "real" non-extra secondaries.
310 GrowableArray<Klass*>* secondaries = compute_secondary_supers(extras);
311 if (secondaries == NULL) {
312 // secondary_supers set by compute_secondary_supers
313 return;
314 }
315
316 GrowableArray<Klass*>* primaries = new GrowableArray<Klass*>(extras);
317
318 for (p = this_kh->super(); !(p == NULL || p->can_be_primary_super()); p = p->super()) {
319 int i; // Scan for overflow primaries being duplicates of 2nd'arys
320
321 // This happens frequently for very deeply nested arrays: the
322 // primary superclass chain overflows into the secondary. The
323 // secondary list contains the element_klass's secondaries with
324 // an extra array dimension added. If the element_klass's
325 // secondary list already contains some primary overflows, they
326 // (with the extra level of array-ness) will collide with the
327 // normal primary superclass overflows.
328 for( i = 0; i < secondaries->length(); i++ ) {
329 if( secondaries->at(i) == p )
330 break;
331 }
332 if( i < secondaries->length() )
333 continue; // It's a dup, don't put it in
334 primaries->push(p);
335 }
336 // Combine the two arrays into a metadata object to pack the array.
337 // The primaries are added in the reverse order, then the secondaries.
338 int new_length = primaries->length() + secondaries->length();
339 Array<Klass*>* s2 = MetadataFactory::new_array<Klass*>(
340 class_loader_data(), new_length, CHECK);
341 int fill_p = primaries->length();
342 for (int j = 0; j < fill_p; j++) {
343 s2->at_put(j, primaries->pop()); // add primaries in reverse order.
344 }
345 for( int j = 0; j < secondaries->length(); j++ ) {
346 s2->at_put(j+fill_p, secondaries->at(j)); // add secondaries on the end.
347 }
348
349 #ifdef ASSERT
350 // We must not copy any NULL placeholders left over from bootstrap.
351 for (int j = 0; j < s2->length(); j++) {
352 assert(s2->at(j) != NULL, "correct bootstrapping order");
353 }
354 #endif
355
356 this_kh->set_secondary_supers(s2);
357 }
358 }
359
360 GrowableArray<Klass*>* Klass::compute_secondary_supers(int num_extra_slots) {
361 assert(num_extra_slots == 0, "override for complex klasses");
362 set_secondary_supers(Universe::the_empty_klass_array());
363 return NULL;
364 }
365
366
367 Klass* Klass::subklass() const {
368 return _subklass == NULL ? NULL : _subklass;
369 }
370
371 InstanceKlass* Klass::superklass() const {
372 assert(super() == NULL || super()->oop_is_instance(), "must be instance klass");
373 return _super == NULL ? NULL : InstanceKlass::cast(_super);
374 }
375
376 Klass* Klass::next_sibling() const {
377 return _next_sibling == NULL ? NULL : _next_sibling;
378 }
379
380 void Klass::set_subklass(Klass* s) {
381 assert(s != this, "sanity check");
382 _subklass = s;
383 }
384
385 void Klass::set_next_sibling(Klass* s) {
386 assert(s != this, "sanity check");
387 _next_sibling = s;
388 }
389
390 void Klass::append_to_sibling_list() {
391 debug_only(verify();)
392 // add ourselves to superklass' subklass list
393 InstanceKlass* super = superklass();
394 if (super == NULL) return; // special case: class Object
395 assert((!super->is_interface() // interfaces cannot be supers
396 && (super->superklass() == NULL || !is_interface())),
397 "an interface can only be a subklass of Object");
398 Klass* prev_first_subklass = super->subklass_oop();
399 if (prev_first_subklass != NULL) {
400 // set our sibling to be the superklass' previous first subklass
401 set_next_sibling(prev_first_subklass);
402 }
403 // make ourselves the superklass' first subklass
404 super->set_subklass(this);
405 debug_only(verify();)
406 }
407
408 bool Klass::is_loader_alive(BoolObjectClosure* is_alive) {
409 #ifdef ASSERT
410 // The class is alive iff the class loader is alive.
411 oop loader = class_loader();
412 bool loader_alive = (loader == NULL) || is_alive->do_object_b(loader);
413 #endif // ASSERT
414
415 // The class is alive if it's mirror is alive (which should be marked if the
416 // loader is alive) unless it's an anoymous class.
417 bool mirror_alive = is_alive->do_object_b(java_mirror());
418 assert(!mirror_alive || loader_alive, "loader must be alive if the mirror is"
419 " but not the other way around with anonymous classes");
420 return mirror_alive;
421 }
422
423 void Klass::clean_weak_klass_links(BoolObjectClosure* is_alive, bool clean_alive_klasses) {
424 if (!ClassUnloading) {
425 return;
426 }
427
428 Klass* root = SystemDictionary::Object_klass();
429 Stack<Klass*, mtGC> stack;
430
431 stack.push(root);
432 while (!stack.is_empty()) {
433 Klass* current = stack.pop();
434
435 assert(current->is_loader_alive(is_alive), "just checking, this should be live");
436
437 // Find and set the first alive subklass
438 Klass* sub = current->subklass_oop();
439 while (sub != NULL && !sub->is_loader_alive(is_alive)) {
440 #ifndef PRODUCT
441 if (TraceClassUnloading && WizardMode) {
442 ResourceMark rm;
443 tty->print_cr("[Unlinking class (subclass) %s]", sub->external_name());
444 }
445 #endif
446 sub = sub->next_sibling_oop();
447 }
448 current->set_subklass(sub);
449 if (sub != NULL) {
450 stack.push(sub);
451 }
452
453 // Find and set the first alive sibling
454 Klass* sibling = current->next_sibling_oop();
455 while (sibling != NULL && !sibling->is_loader_alive(is_alive)) {
456 if (TraceClassUnloading && WizardMode) {
457 ResourceMark rm;
458 tty->print_cr("[Unlinking class (sibling) %s]", sibling->external_name());
459 }
460 sibling = sibling->next_sibling_oop();
461 }
462 current->set_next_sibling(sibling);
463 if (sibling != NULL) {
464 stack.push(sibling);
465 }
466
467 // Clean the implementors list and method data.
468 if (clean_alive_klasses && current->oop_is_instance()) {
469 InstanceKlass* ik = InstanceKlass::cast(current);
470 ik->clean_weak_instanceklass_links(is_alive);
471
472 // JVMTI RedefineClasses creates previous versions that are not in
473 // the class hierarchy, so process them here.
474 while ((ik = ik->previous_versions()) != NULL) {
475 ik->clean_weak_instanceklass_links(is_alive);
476 }
477 }
478 }
479 }
480
481 void Klass::klass_update_barrier_set(oop v) {
482 record_modified_oops();
483 }
484
485 // This barrier is used by G1 to remember the old oop values, so
486 // that we don't forget any objects that were live at the snapshot at
487 // the beginning. This function is only used when we write oops into Klasses.
488 void Klass::klass_update_barrier_set_pre(oop* p, oop v) {
489 #if INCLUDE_ALL_GCS
490 if (UseG1GC) {
491 oop obj = *p;
492 if (obj != NULL) {
493 G1SATBCardTableModRefBS::enqueue(obj);
494 }
495 }
496 #endif
497 }
498
499 void Klass::klass_oop_store(oop* p, oop v) {
500 assert(!Universe::heap()->is_in_reserved((void*)p), "Should store pointer into metadata");
501 assert(v == NULL || Universe::heap()->is_in_reserved((void*)v), "Should store pointer to an object");
502
503 // do the store
504 if (always_do_update_barrier) {
505 klass_oop_store((volatile oop*)p, v);
506 } else {
507 klass_update_barrier_set_pre(p, v);
508 *p = v;
509 klass_update_barrier_set(v);
510 }
511 }
512
513 void Klass::klass_oop_store(volatile oop* p, oop v) {
514 assert(!Universe::heap()->is_in_reserved((void*)p), "Should store pointer into metadata");
515 assert(v == NULL || Universe::heap()->is_in_reserved((void*)v), "Should store pointer to an object");
516
517 klass_update_barrier_set_pre((oop*)p, v); // Cast away volatile.
518 OrderAccess::release_store_ptr(p, v);
519 klass_update_barrier_set(v);
520 }
521
522 void Klass::oops_do(OopClosure* cl) {
523 cl->do_oop(&_java_mirror);
524 }
525
526 void Klass::remove_unshareable_info() {
527 assert (DumpSharedSpaces, "only called for DumpSharedSpaces");
528
529 set_subklass(NULL);
530 set_next_sibling(NULL);
531 // Clear the java mirror
532 set_java_mirror(NULL);
533 set_next_link(NULL);
534
535 // Null out class_loader_data because we don't share that yet.
536 set_class_loader_data(NULL);
537 }
538
539 void Klass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) {
540 TRACE_INIT_ID(this);
541 // If an exception happened during CDS restore, some of these fields may already be
542 // set. We leave the class on the CLD list, even if incomplete so that we don't
543 // modify the CLD list outside a safepoint.
544 if (class_loader_data() == NULL) {
545 // Restore class_loader_data
546 set_class_loader_data(loader_data);
547
548 // Add to class loader list first before creating the mirror
549 // (same order as class file parsing)
550 loader_data->add_class(this);
551 }
552
553 // Recreate the class mirror.
554 // Only recreate it if not present. A previous attempt to restore may have
555 // gotten an OOM later but keep the mirror if it was created.
556 if (java_mirror() == NULL) {
557 java_lang_Class::create_mirror(this, class_loader(), protection_domain, CHECK);
558 }
559 }
560
561 Klass* Klass::array_klass_or_null(int rank) {
562 EXCEPTION_MARK;
563 // No exception can be thrown by array_klass_impl when called with or_null == true.
564 // (In anycase, the execption mark will fail if it do so)
565 return array_klass_impl(true, rank, THREAD);
566 }
567
568
569 Klass* Klass::array_klass_or_null() {
570 EXCEPTION_MARK;
571 // No exception can be thrown by array_klass_impl when called with or_null == true.
572 // (In anycase, the execption mark will fail if it do so)
573 return array_klass_impl(true, THREAD);
574 }
575
576
577 Klass* Klass::array_klass_impl(bool or_null, int rank, TRAPS) {
578 fatal("array_klass should be dispatched to InstanceKlass, ObjArrayKlass or TypeArrayKlass");
579 return NULL;
580 }
581
582
583 Klass* Klass::array_klass_impl(bool or_null, TRAPS) {
584 fatal("array_klass should be dispatched to InstanceKlass, ObjArrayKlass or TypeArrayKlass");
585 return NULL;
586 }
587
588 oop Klass::class_loader() const { return class_loader_data()->class_loader(); }
589
590 const char* Klass::external_name() const {
591 if (oop_is_instance()) {
592 InstanceKlass* ik = (InstanceKlass*) this;
593 if (ik->is_anonymous()) {
594 assert(EnableInvokeDynamic, "");
595 intptr_t hash = 0;
596 if (ik->java_mirror() != NULL) {
597 // java_mirror might not be created yet, return 0 as hash.
598 hash = ik->java_mirror()->identity_hash();
599 }
600 char hash_buf[40];
601 sprintf(hash_buf, "/" UINTX_FORMAT, (uintx)hash);
602 size_t hash_len = strlen(hash_buf);
603
604 size_t result_len = name()->utf8_length();
605 char* result = NEW_RESOURCE_ARRAY(char, result_len + hash_len + 1);
606 name()->as_klass_external_name(result, (int) result_len + 1);
607 assert(strlen(result) == result_len, "");
608 strcpy(result + result_len, hash_buf);
609 assert(strlen(result) == result_len + hash_len, "");
610 return result;
611 }
612 }
613 if (name() == NULL) return "<unknown>";
614 return name()->as_klass_external_name();
615 }
616
617
618 const char* Klass::signature_name() const {
619 if (name() == NULL) return "<unknown>";
620 return name()->as_C_string();
621 }
622
623 // Unless overridden, modifier_flags is 0.
624 jint Klass::compute_modifier_flags(TRAPS) const {
625 return 0;
626 }
627
628 int Klass::atomic_incr_biased_lock_revocation_count() {
629 return (int) Atomic::add(1, &_biased_lock_revocation_count);
630 }
631
632 // Unless overridden, jvmti_class_status has no flags set.
633 jint Klass::jvmti_class_status() const {
634 return 0;
635 }
636
637
638 // Printing
639
640 void Klass::print_on(outputStream* st) const {
641 ResourceMark rm;
642 // print title
643 st->print("%s", internal_name());
644 print_address_on(st);
645 st->cr();
646 }
647
648 void Klass::oop_print_on(oop obj, outputStream* st) {
649 ResourceMark rm;
650 // print title
651 st->print_cr("%s ", internal_name());
652 obj->print_address_on(st);
653
654 if (WizardMode) {
655 // print header
656 obj->mark()->print_on(st);
657 }
658
659 // print class
660 st->print(" - klass: ");
661 obj->klass()->print_value_on(st);
662 st->cr();
663 }
664
665 void Klass::oop_print_value_on(oop obj, outputStream* st) {
666 // print title
667 ResourceMark rm; // Cannot print in debug mode without this
668 st->print("%s", internal_name());
669 obj->print_address_on(st);
670 }
671
672 #if INCLUDE_SERVICES
673 // Size Statistics
674 void Klass::collect_statistics(KlassSizeStats *sz) const {
675 sz->_klass_bytes = sz->count(this);
676 sz->_mirror_bytes = sz->count(java_mirror());
677 sz->_secondary_supers_bytes = sz->count_array(secondary_supers());
678
679 sz->_ro_bytes += sz->_secondary_supers_bytes;
680 sz->_rw_bytes += sz->_klass_bytes + sz->_mirror_bytes;
681 }
682 #endif // INCLUDE_SERVICES
683
684 // Verification
685
686 void Klass::verify_on(outputStream* st) {
687
688 // This can be expensive, but it is worth checking that this klass is actually
689 // in the CLD graph but not in production.
690 assert(Metaspace::contains((address)this), "Should be");
691
692 guarantee(this->is_klass(),"should be klass");
693
694 if (super() != NULL) {
695 guarantee(super()->is_klass(), "should be klass");
696 }
697 if (secondary_super_cache() != NULL) {
698 Klass* ko = secondary_super_cache();
699 guarantee(ko->is_klass(), "should be klass");
700 }
701 for ( uint i = 0; i < primary_super_limit(); i++ ) {
702 Klass* ko = _primary_supers[i];
703 if (ko != NULL) {
704 guarantee(ko->is_klass(), "should be klass");
705 }
706 }
707
708 if (java_mirror() != NULL) {
709 guarantee(java_mirror()->is_oop(), "should be instance");
710 }
711 }
712
713 void Klass::oop_verify_on(oop obj, outputStream* st) {
714 guarantee(obj->is_oop(), "should be oop");
715 guarantee(obj->klass()->is_klass(), "klass field is not a klass");
716 }
717
718 #ifndef PRODUCT
719
720 bool Klass::verify_vtable_index(int i) {
721 if (oop_is_instance()) {
722 int limit = ((InstanceKlass*)this)->vtable_length()/vtableEntry::size();
723 assert(i >= 0 && i < limit, err_msg("index %d out of bounds %d", i, limit));
724 } else {
725 assert(oop_is_array(), "Must be");
726 int limit = ((ArrayKlass*)this)->vtable_length()/vtableEntry::size();
727 assert(i >= 0 && i < limit, err_msg("index %d out of bounds %d", i, limit));
728 }
729 return true;
730 }
731
732 bool Klass::verify_itable_index(int i) {
733 assert(oop_is_instance(), "");
734 int method_count = klassItable::method_count_for_interface(this);
735 assert(i >= 0 && i < method_count, "index out of bounds");
736 return true;
737 }
738
739 #endif
740
741 /////////////// Unit tests ///////////////
742
743 #ifndef PRODUCT
744
745 class TestKlass {
746 public:
747 static void test_oop_is_instanceClassLoader() {
748 assert(SystemDictionary::ClassLoader_klass()->oop_is_instanceClassLoader(), "assert");
749 assert(!SystemDictionary::String_klass()->oop_is_instanceClassLoader(), "assert");
750 }
751 };
752
753 void TestKlass_test() {
754 TestKlass::test_oop_is_instanceClassLoader();
755 }
756
757 #endif