1 /*
2 * Copyright (c) 1997, 2014, 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/systemDictionary.hpp"
28 #include "classfile/verifier.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "compiler/compileBroker.hpp"
31 #include "gc_implementation/shared/markSweep.inline.hpp"
32 #include "gc_interface/collectedHeap.inline.hpp"
33 #include "interpreter/oopMapCache.hpp"
34 #include "interpreter/rewriter.hpp"
35 #include "jvmtifiles/jvmti.h"
36 #include "memory/genOopClosures.inline.hpp"
37 #include "memory/heapInspection.hpp"
38 #include "memory/iterator.inline.hpp"
39 #include "memory/metadataFactory.hpp"
40 #include "memory/oopFactory.hpp"
41 #include "oops/fieldStreams.hpp"
42 #include "oops/instanceClassLoaderKlass.hpp"
43 #include "oops/instanceKlass.hpp"
44 #include "oops/instanceMirrorKlass.hpp"
45 #include "oops/instanceOop.hpp"
46 #include "oops/klass.inline.hpp"
47 #include "oops/method.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "oops/symbol.hpp"
50 #include "prims/jvmtiExport.hpp"
51 #include "prims/jvmtiRedefineClassesTrace.hpp"
52 #include "prims/jvmtiRedefineClasses.hpp"
53 #include "prims/jvmtiThreadState.hpp"
54 #include "prims/methodComparator.hpp"
55 #include "runtime/atomic.inline.hpp"
56 #include "runtime/fieldDescriptor.hpp"
57 #include "runtime/handles.inline.hpp"
58 #include "runtime/javaCalls.hpp"
59 #include "runtime/mutexLocker.hpp"
60 #include "runtime/orderAccess.inline.hpp"
61 #include "runtime/thread.inline.hpp"
62 #include "services/classLoadingService.hpp"
63 #include "services/threadService.hpp"
64 #include "utilities/dtrace.hpp"
65 #include "utilities/macros.hpp"
66 #if INCLUDE_ALL_GCS
67 #include "gc_implementation/concurrentMarkSweep/cmsOopClosures.inline.hpp"
68 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
69 #include "gc_implementation/g1/g1OopClosures.inline.hpp"
70 #include "gc_implementation/g1/g1RemSet.inline.hpp"
71 #include "gc_implementation/g1/heapRegionManager.inline.hpp"
72 #include "gc_implementation/parNew/parOopClosures.inline.hpp"
73 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.inline.hpp"
74 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
75 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
76 #include "oops/oop.pcgc.inline.hpp"
77 #endif // INCLUDE_ALL_GCS
78 #ifdef COMPILER1
79 #include "c1/c1_Compiler.hpp"
80 #endif
81
82 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
83
84 #ifdef DTRACE_ENABLED
85
86
87 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED
88 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE
89 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT
90 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS
91 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED
92 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT
93 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR
94 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END
95 #define DTRACE_CLASSINIT_PROBE(type, clss, thread_type) \
96 { \
97 char* data = NULL; \
98 int len = 0; \
99 Symbol* name = (clss)->name(); \
100 if (name != NULL) { \
101 data = (char*)name->bytes(); \
102 len = name->utf8_length(); \
103 } \
104 HOTSPOT_CLASS_INITIALIZATION_##type( \
105 data, len, (clss)->class_loader(), thread_type); \
106 }
107
108 #define DTRACE_CLASSINIT_PROBE_WAIT(type, clss, thread_type, wait) \
109 { \
110 char* data = NULL; \
111 int len = 0; \
112 Symbol* name = (clss)->name(); \
113 if (name != NULL) { \
114 data = (char*)name->bytes(); \
115 len = name->utf8_length(); \
116 } \
117 HOTSPOT_CLASS_INITIALIZATION_##type( \
118 data, len, (clss)->class_loader(), thread_type, wait); \
119 }
120
121 #else // ndef DTRACE_ENABLED
122
123 #define DTRACE_CLASSINIT_PROBE(type, clss, thread_type)
124 #define DTRACE_CLASSINIT_PROBE_WAIT(type, clss, thread_type, wait)
125
126 #endif // ndef DTRACE_ENABLED
127
128 volatile int InstanceKlass::_total_instanceKlass_count = 0;
129
130 InstanceKlass* InstanceKlass::allocate_instance_klass(
131 ClassLoaderData* loader_data,
132 int vtable_len,
133 int itable_len,
134 int static_field_size,
135 int nonstatic_oop_map_size,
136 ReferenceType rt,
137 AccessFlags access_flags,
138 Symbol* name,
139 Klass* super_klass,
140 bool is_anonymous,
141 TRAPS) {
142
143 int size = InstanceKlass::size(vtable_len, itable_len, nonstatic_oop_map_size,
144 access_flags.is_interface(), is_anonymous);
145
146 // Allocation
147 InstanceKlass* ik;
148 if (rt == REF_NONE) {
149 if (name == vmSymbols::java_lang_Class()) {
150 ik = new (loader_data, size, THREAD) InstanceMirrorKlass(
151 vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt,
152 access_flags, is_anonymous);
153 } else if (name == vmSymbols::java_lang_ClassLoader() ||
154 (SystemDictionary::ClassLoader_klass_loaded() &&
155 super_klass != NULL &&
156 super_klass->is_subtype_of(SystemDictionary::ClassLoader_klass()))) {
157 ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(
158 vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt,
159 access_flags, is_anonymous);
160 } else {
161 // normal class
162 ik = new (loader_data, size, THREAD) InstanceKlass(
163 vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt,
164 access_flags, is_anonymous);
165 }
166 } else {
167 // reference klass
168 ik = new (loader_data, size, THREAD) InstanceRefKlass(
169 vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt,
170 access_flags, is_anonymous);
171 }
172
173 // Check for pending exception before adding to the loader data and incrementing
174 // class count. Can get OOM here.
175 if (HAS_PENDING_EXCEPTION) {
176 return NULL;
177 }
178
179 // Add all classes to our internal class loader list here,
180 // including classes in the bootstrap (NULL) class loader.
181 loader_data->add_class(ik);
182
183 Atomic::inc(&_total_instanceKlass_count);
184 return ik;
185 }
186
187
188 // copy method ordering from resource area to Metaspace
189 void InstanceKlass::copy_method_ordering(intArray* m, TRAPS) {
190 if (m != NULL) {
191 // allocate a new array and copy contents (memcpy?)
192 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
193 for (int i = 0; i < m->length(); i++) {
194 _method_ordering->at_put(i, m->at(i));
195 }
196 } else {
197 _method_ordering = Universe::the_empty_int_array();
198 }
199 }
200
201 // create a new array of vtable_indices for default methods
202 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
203 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
204 assert(default_vtable_indices() == NULL, "only create once");
205 set_default_vtable_indices(vtable_indices);
206 return vtable_indices;
207 }
208
209 InstanceKlass::InstanceKlass(int vtable_len,
210 int itable_len,
211 int static_field_size,
212 int nonstatic_oop_map_size,
213 ReferenceType rt,
214 AccessFlags access_flags,
215 bool is_anonymous) {
216 No_Safepoint_Verifier no_safepoint; // until k becomes parsable
217
218 int iksize = InstanceKlass::size(vtable_len, itable_len, nonstatic_oop_map_size,
219 access_flags.is_interface(), is_anonymous);
220
221 set_vtable_length(vtable_len);
222 set_itable_length(itable_len);
223 set_static_field_size(static_field_size);
224 set_nonstatic_oop_map_size(nonstatic_oop_map_size);
225 set_access_flags(access_flags);
226 _misc_flags = 0; // initialize to zero
227 set_is_anonymous(is_anonymous);
228 assert(size() == iksize, "wrong size for object");
229
230 set_array_klasses(NULL);
231 set_methods(NULL);
232 set_method_ordering(NULL);
233 set_default_methods(NULL);
234 set_default_vtable_indices(NULL);
235 set_local_interfaces(NULL);
236 set_transitive_interfaces(NULL);
237 init_implementor();
238 set_fields(NULL, 0);
239 set_constants(NULL);
240 set_class_loader_data(NULL);
241 set_source_file_name_index(0);
242 set_source_debug_extension(NULL, 0);
243 set_array_name(NULL);
244 set_inner_classes(NULL);
245 set_static_oop_field_count(0);
246 set_nonstatic_field_size(0);
247 set_is_marked_dependent(false);
248 set_has_unloaded_dependent(false);
249 set_init_state(InstanceKlass::allocated);
250 set_init_thread(NULL);
251 set_reference_type(rt);
252 set_oop_map_cache(NULL);
253 set_jni_ids(NULL);
254 set_osr_nmethods_head(NULL);
255 set_breakpoints(NULL);
256 init_previous_versions();
257 set_generic_signature_index(0);
258 release_set_methods_jmethod_ids(NULL);
259 set_annotations(NULL);
260 set_jvmti_cached_class_field_map(NULL);
261 set_initial_method_idnum(0);
262 _dependencies = NULL;
263 set_jvmti_cached_class_field_map(NULL);
264 set_cached_class_file(NULL);
265 set_initial_method_idnum(0);
266 set_minor_version(0);
267 set_major_version(0);
268 NOT_PRODUCT(_verify_count = 0;)
269
270 // initialize the non-header words to zero
271 intptr_t* p = (intptr_t*)this;
272 for (int index = InstanceKlass::header_size(); index < iksize; index++) {
273 p[index] = NULL_WORD;
274 }
275
276 // Set temporary value until parseClassFile updates it with the real instance
277 // size.
278 set_layout_helper(Klass::instance_layout_helper(0, true));
279 }
280
281
282 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
283 Array<Method*>* methods) {
284 if (methods != NULL && methods != Universe::the_empty_method_array() &&
285 !methods->is_shared()) {
286 for (int i = 0; i < methods->length(); i++) {
287 Method* method = methods->at(i);
288 if (method == NULL) continue; // maybe null if error processing
289 // Only want to delete methods that are not executing for RedefineClasses.
290 // The previous version will point to them so they're not totally dangling
291 assert (!method->on_stack(), "shouldn't be called with methods on stack");
292 MetadataFactory::free_metadata(loader_data, method);
293 }
294 MetadataFactory::free_array<Method*>(loader_data, methods);
295 }
296 }
297
298 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
299 Klass* super_klass,
300 Array<Klass*>* local_interfaces,
301 Array<Klass*>* transitive_interfaces) {
302 // Only deallocate transitive interfaces if not empty, same as super class
303 // or same as local interfaces. See code in parseClassFile.
304 Array<Klass*>* ti = transitive_interfaces;
305 if (ti != Universe::the_empty_klass_array() && ti != local_interfaces) {
306 // check that the interfaces don't come from super class
307 Array<Klass*>* sti = (super_klass == NULL) ? NULL :
308 InstanceKlass::cast(super_klass)->transitive_interfaces();
309 if (ti != sti && ti != NULL && !ti->is_shared()) {
310 MetadataFactory::free_array<Klass*>(loader_data, ti);
311 }
312 }
313
314 // local interfaces can be empty
315 if (local_interfaces != Universe::the_empty_klass_array() &&
316 local_interfaces != NULL && !local_interfaces->is_shared()) {
317 MetadataFactory::free_array<Klass*>(loader_data, local_interfaces);
318 }
319 }
320
321 // This function deallocates the metadata and C heap pointers that the
322 // InstanceKlass points to.
323 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
324
325 // Orphan the mirror first, CMS thinks it's still live.
326 if (java_mirror() != NULL) {
327 java_lang_Class::set_klass(java_mirror(), NULL);
328 }
329
330 // Need to take this class off the class loader data list.
331 loader_data->remove_class(this);
332
333 // The array_klass for this class is created later, after error handling.
334 // For class redefinition, we keep the original class so this scratch class
335 // doesn't have an array class. Either way, assert that there is nothing
336 // to deallocate.
337 assert(array_klasses() == NULL, "array classes shouldn't be created for this class yet");
338
339 // Release C heap allocated data that this might point to, which includes
340 // reference counting symbol names.
341 release_C_heap_structures();
342
343 deallocate_methods(loader_data, methods());
344 set_methods(NULL);
345
346 if (method_ordering() != NULL &&
347 method_ordering() != Universe::the_empty_int_array() &&
348 !method_ordering()->is_shared()) {
349 MetadataFactory::free_array<int>(loader_data, method_ordering());
350 }
351 set_method_ordering(NULL);
352
353 // default methods can be empty
354 if (default_methods() != NULL &&
355 default_methods() != Universe::the_empty_method_array() &&
356 !default_methods()->is_shared()) {
357 MetadataFactory::free_array<Method*>(loader_data, default_methods());
358 }
359 // Do NOT deallocate the default methods, they are owned by superinterfaces.
360 set_default_methods(NULL);
361
362 // default methods vtable indices can be empty
363 if (default_vtable_indices() != NULL &&
364 !default_vtable_indices()->is_shared()) {
365 MetadataFactory::free_array<int>(loader_data, default_vtable_indices());
366 }
367 set_default_vtable_indices(NULL);
368
369
370 // This array is in Klass, but remove it with the InstanceKlass since
371 // this place would be the only caller and it can share memory with transitive
372 // interfaces.
373 if (secondary_supers() != NULL &&
374 secondary_supers() != Universe::the_empty_klass_array() &&
375 secondary_supers() != transitive_interfaces() &&
376 !secondary_supers()->is_shared()) {
377 MetadataFactory::free_array<Klass*>(loader_data, secondary_supers());
378 }
379 set_secondary_supers(NULL);
380
381 deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces());
382 set_transitive_interfaces(NULL);
383 set_local_interfaces(NULL);
384
385 if (fields() != NULL && !fields()->is_shared()) {
386 MetadataFactory::free_array<jushort>(loader_data, fields());
387 }
388 set_fields(NULL, 0);
389
390 // If a method from a redefined class is using this constant pool, don't
391 // delete it, yet. The new class's previous version will point to this.
392 if (constants() != NULL) {
393 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack");
394 if (!constants()->is_shared()) {
395 MetadataFactory::free_metadata(loader_data, constants());
396 }
397 set_constants(NULL);
398 }
399
400 if (inner_classes() != NULL &&
401 inner_classes() != Universe::the_empty_short_array() &&
402 !inner_classes()->is_shared()) {
403 MetadataFactory::free_array<jushort>(loader_data, inner_classes());
404 }
405 set_inner_classes(NULL);
406
407 // We should deallocate the Annotations instance if it's not in shared spaces.
408 if (annotations() != NULL && !annotations()->is_shared()) {
409 MetadataFactory::free_metadata(loader_data, annotations());
410 }
411 set_annotations(NULL);
412 }
413
414 bool InstanceKlass::should_be_initialized() const {
415 return !is_initialized();
416 }
417
418 klassVtable* InstanceKlass::vtable() const {
419 return new klassVtable(this, start_of_vtable(), vtable_length() / vtableEntry::size());
420 }
421
422 klassItable* InstanceKlass::itable() const {
423 return new klassItable(instanceKlassHandle(this));
424 }
425
426 void InstanceKlass::eager_initialize(Thread *thread) {
427 if (!EagerInitialization) return;
428
429 if (this->is_not_initialized()) {
430 // abort if the the class has a class initializer
431 if (this->class_initializer() != NULL) return;
432
433 // abort if it is java.lang.Object (initialization is handled in genesis)
434 Klass* super = this->super();
435 if (super == NULL) return;
436
437 // abort if the super class should be initialized
438 if (!InstanceKlass::cast(super)->is_initialized()) return;
439
440 // call body to expose the this pointer
441 instanceKlassHandle this_k(thread, this);
442 eager_initialize_impl(this_k);
443 }
444 }
445
446 // JVMTI spec thinks there are signers and protection domain in the
447 // instanceKlass. These accessors pretend these fields are there.
448 // The hprof specification also thinks these fields are in InstanceKlass.
449 oop InstanceKlass::protection_domain() const {
450 // return the protection_domain from the mirror
451 return java_lang_Class::protection_domain(java_mirror());
452 }
453
454 // To remove these from requires an incompatible change and CCC request.
455 objArrayOop InstanceKlass::signers() const {
456 // return the signers from the mirror
457 return java_lang_Class::signers(java_mirror());
458 }
459
460 oop InstanceKlass::init_lock() const {
461 // return the init lock from the mirror
462 oop lock = java_lang_Class::init_lock(java_mirror());
463 // Prevent reordering with any access of initialization state
464 OrderAccess::loadload();
465 assert((oop)lock != NULL || !is_not_initialized(), // initialized or in_error state
466 "only fully initialized state can have a null lock");
467 return lock;
468 }
469
470 // Set the initialization lock to null so the object can be GC'ed. Any racing
471 // threads to get this lock will see a null lock and will not lock.
472 // That's okay because they all check for initialized state after getting
473 // the lock and return.
474 void InstanceKlass::fence_and_clear_init_lock() {
475 // make sure previous stores are all done, notably the init_state.
476 OrderAccess::storestore();
477 java_lang_Class::set_init_lock(java_mirror(), NULL);
478 assert(!is_not_initialized(), "class must be initialized now");
479 }
480
481 void InstanceKlass::eager_initialize_impl(instanceKlassHandle this_k) {
482 EXCEPTION_MARK;
483 oop init_lock = this_k->init_lock();
484 ObjectLocker ol(init_lock, THREAD, init_lock != NULL);
485
486 // abort if someone beat us to the initialization
487 if (!this_k->is_not_initialized()) return; // note: not equivalent to is_initialized()
488
489 ClassState old_state = this_k->init_state();
490 link_class_impl(this_k, true, THREAD);
491 if (HAS_PENDING_EXCEPTION) {
492 CLEAR_PENDING_EXCEPTION;
493 // Abort if linking the class throws an exception.
494
495 // Use a test to avoid redundantly resetting the state if there's
496 // no change. Set_init_state() asserts that state changes make
497 // progress, whereas here we might just be spinning in place.
498 if( old_state != this_k->_init_state )
499 this_k->set_init_state (old_state);
500 } else {
501 // linking successfull, mark class as initialized
502 this_k->set_init_state (fully_initialized);
503 this_k->fence_and_clear_init_lock();
504 // trace
505 if (TraceClassInitialization) {
506 ResourceMark rm(THREAD);
507 tty->print_cr("[Initialized %s without side effects]", this_k->external_name());
508 }
509 }
510 }
511
512
513 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization
514 // process. The step comments refers to the procedure described in that section.
515 // Note: implementation moved to static method to expose the this pointer.
516 void InstanceKlass::initialize(TRAPS) {
517 if (this->should_be_initialized()) {
518 HandleMark hm(THREAD);
519 instanceKlassHandle this_k(THREAD, this);
520 initialize_impl(this_k, CHECK);
521 // Note: at this point the class may be initialized
522 // OR it may be in the state of being initialized
523 // in case of recursive initialization!
524 } else {
525 assert(is_initialized(), "sanity check");
526 }
527 }
528
529
530 bool InstanceKlass::verify_code(
531 instanceKlassHandle this_k, bool throw_verifyerror, TRAPS) {
532 // 1) Verify the bytecodes
533 Verifier::Mode mode =
534 throw_verifyerror ? Verifier::ThrowException : Verifier::NoException;
535 return Verifier::verify(this_k, mode, this_k->should_verify_class(), CHECK_false);
536 }
537
538
539 // Used exclusively by the shared spaces dump mechanism to prevent
540 // classes mapped into the shared regions in new VMs from appearing linked.
541
542 void InstanceKlass::unlink_class() {
543 assert(is_linked(), "must be linked");
544 _init_state = loaded;
545 }
546
547 void InstanceKlass::link_class(TRAPS) {
548 assert(is_loaded(), "must be loaded");
549 if (!is_linked()) {
550 HandleMark hm(THREAD);
551 instanceKlassHandle this_k(THREAD, this);
552 link_class_impl(this_k, true, CHECK);
553 }
554 }
555
556 // Called to verify that a class can link during initialization, without
557 // throwing a VerifyError.
558 bool InstanceKlass::link_class_or_fail(TRAPS) {
559 assert(is_loaded(), "must be loaded");
560 if (!is_linked()) {
561 HandleMark hm(THREAD);
562 instanceKlassHandle this_k(THREAD, this);
563 link_class_impl(this_k, false, CHECK_false);
564 }
565 return is_linked();
566 }
567
568 bool InstanceKlass::link_class_impl(
569 instanceKlassHandle this_k, bool throw_verifyerror, TRAPS) {
570 // check for error state
571 if (this_k->is_in_error_state()) {
572 ResourceMark rm(THREAD);
573 THROW_MSG_(vmSymbols::java_lang_NoClassDefFoundError(),
574 this_k->external_name(), false);
575 }
576 // return if already verified
577 if (this_k->is_linked()) {
578 return true;
579 }
580
581 // Timing
582 // timer handles recursion
583 assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl");
584 JavaThread* jt = (JavaThread*)THREAD;
585
586 // link super class before linking this class
587 instanceKlassHandle super(THREAD, this_k->super());
588 if (super.not_null()) {
589 if (super->is_interface()) { // check if super class is an interface
590 ResourceMark rm(THREAD);
591 Exceptions::fthrow(
592 THREAD_AND_LOCATION,
593 vmSymbols::java_lang_IncompatibleClassChangeError(),
594 "class %s has interface %s as super class",
595 this_k->external_name(),
596 super->external_name()
597 );
598 return false;
599 }
600
601 link_class_impl(super, throw_verifyerror, CHECK_false);
602 }
603
604 // link all interfaces implemented by this class before linking this class
605 Array<Klass*>* interfaces = this_k->local_interfaces();
606 int num_interfaces = interfaces->length();
607 for (int index = 0; index < num_interfaces; index++) {
608 HandleMark hm(THREAD);
609 instanceKlassHandle ih(THREAD, interfaces->at(index));
610 link_class_impl(ih, throw_verifyerror, CHECK_false);
611 }
612
613 // in case the class is linked in the process of linking its superclasses
614 if (this_k->is_linked()) {
615 return true;
616 }
617
618 // trace only the link time for this klass that includes
619 // the verification time
620 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
621 ClassLoader::perf_class_link_selftime(),
622 ClassLoader::perf_classes_linked(),
623 jt->get_thread_stat()->perf_recursion_counts_addr(),
624 jt->get_thread_stat()->perf_timers_addr(),
625 PerfClassTraceTime::CLASS_LINK);
626
627 // verification & rewriting
628 {
629 oop init_lock = this_k->init_lock();
630 ObjectLocker ol(init_lock, THREAD, init_lock != NULL);
631 // rewritten will have been set if loader constraint error found
632 // on an earlier link attempt
633 // don't verify or rewrite if already rewritten
634
635 if (!this_k->is_linked()) {
636 if (!this_k->is_rewritten()) {
637 {
638 // Timer includes any side effects of class verification (resolution,
639 // etc), but not recursive entry into verify_code().
640 PerfClassTraceTime timer(ClassLoader::perf_class_verify_time(),
641 ClassLoader::perf_class_verify_selftime(),
642 ClassLoader::perf_classes_verified(),
643 jt->get_thread_stat()->perf_recursion_counts_addr(),
644 jt->get_thread_stat()->perf_timers_addr(),
645 PerfClassTraceTime::CLASS_VERIFY);
646 bool verify_ok = verify_code(this_k, throw_verifyerror, THREAD);
647 if (!verify_ok) {
648 return false;
649 }
650 }
651
652 // Just in case a side-effect of verify linked this class already
653 // (which can sometimes happen since the verifier loads classes
654 // using custom class loaders, which are free to initialize things)
655 if (this_k->is_linked()) {
656 return true;
657 }
658
659 // also sets rewritten
660 this_k->rewrite_class(CHECK_false);
661 }
662
663 // relocate jsrs and link methods after they are all rewritten
664 this_k->link_methods(CHECK_false);
665
666 // Initialize the vtable and interface table after
667 // methods have been rewritten since rewrite may
668 // fabricate new Method*s.
669 // also does loader constraint checking
670 if (!this_k()->is_shared()) {
671 ResourceMark rm(THREAD);
672 this_k->vtable()->initialize_vtable(true, CHECK_false);
673 this_k->itable()->initialize_itable(true, CHECK_false);
674 }
675 #ifdef ASSERT
676 else {
677 ResourceMark rm(THREAD);
678 this_k->vtable()->verify(tty, true);
679 // In case itable verification is ever added.
680 // this_k->itable()->verify(tty, true);
681 }
682 #endif
683 this_k->set_init_state(linked);
684 if (JvmtiExport::should_post_class_prepare()) {
685 Thread *thread = THREAD;
686 assert(thread->is_Java_thread(), "thread->is_Java_thread()");
687 JvmtiExport::post_class_prepare((JavaThread *) thread, this_k());
688 }
689 }
690 }
691 return true;
692 }
693
694
695 // Rewrite the byte codes of all of the methods of a class.
696 // The rewriter must be called exactly once. Rewriting must happen after
697 // verification but before the first method of the class is executed.
698 void InstanceKlass::rewrite_class(TRAPS) {
699 assert(is_loaded(), "must be loaded");
700 instanceKlassHandle this_k(THREAD, this);
701 if (this_k->is_rewritten()) {
702 assert(this_k()->is_shared(), "rewriting an unshared class?");
703 return;
704 }
705 Rewriter::rewrite(this_k, CHECK);
706 this_k->set_rewritten();
707 }
708
709 // Now relocate and link method entry points after class is rewritten.
710 // This is outside is_rewritten flag. In case of an exception, it can be
711 // executed more than once.
712 void InstanceKlass::link_methods(TRAPS) {
713 int len = methods()->length();
714 for (int i = len-1; i >= 0; i--) {
715 methodHandle m(THREAD, methods()->at(i));
716
717 // Set up method entry points for compiler and interpreter .
718 m->link_method(m, CHECK);
719
720 // This is for JVMTI and unrelated to relocator but the last thing we do
721 #ifdef ASSERT
722 if (StressMethodComparator) {
723 ResourceMark rm(THREAD);
724 static int nmc = 0;
725 for (int j = i; j >= 0 && j >= i-4; j--) {
726 if ((++nmc % 1000) == 0) tty->print_cr("Have run MethodComparator %d times...", nmc);
727 bool z = MethodComparator::methods_EMCP(m(),
728 methods()->at(j));
729 if (j == i && !z) {
730 tty->print("MethodComparator FAIL: "); m->print(); m->print_codes();
731 assert(z, "method must compare equal to itself");
732 }
733 }
734 }
735 #endif //ASSERT
736 }
737 }
738
739
740 void InstanceKlass::initialize_impl(instanceKlassHandle this_k, TRAPS) {
741 // Make sure klass is linked (verified) before initialization
742 // A class could already be verified, since it has been reflected upon.
743 this_k->link_class(CHECK);
744
745 DTRACE_CLASSINIT_PROBE(required, InstanceKlass::cast(this_k()), -1);
746
747 bool wait = false;
748
749 // refer to the JVM book page 47 for description of steps
750 // Step 1
751 {
752 oop init_lock = this_k->init_lock();
753 ObjectLocker ol(init_lock, THREAD, init_lock != NULL);
754
755 Thread *self = THREAD; // it's passed the current thread
756
757 // Step 2
758 // If we were to use wait() instead of waitInterruptibly() then
759 // we might end up throwing IE from link/symbol resolution sites
760 // that aren't expected to throw. This would wreak havoc. See 6320309.
761 while(this_k->is_being_initialized() && !this_k->is_reentrant_initialization(self)) {
762 wait = true;
763 ol.waitUninterruptibly(CHECK);
764 }
765
766 // Step 3
767 if (this_k->is_being_initialized() && this_k->is_reentrant_initialization(self)) {
768 DTRACE_CLASSINIT_PROBE_WAIT(recursive, InstanceKlass::cast(this_k()), -1,wait);
769 return;
770 }
771
772 // Step 4
773 if (this_k->is_initialized()) {
774 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, InstanceKlass::cast(this_k()), -1,wait);
775 return;
776 }
777
778 // Step 5
779 if (this_k->is_in_error_state()) {
780 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, InstanceKlass::cast(this_k()), -1,wait);
781 ResourceMark rm(THREAD);
782 const char* desc = "Could not initialize class ";
783 const char* className = this_k->external_name();
784 size_t msglen = strlen(desc) + strlen(className) + 1;
785 char* message = NEW_RESOURCE_ARRAY(char, msglen);
786 if (NULL == message) {
787 // Out of memory: can't create detailed error message
788 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className);
789 } else {
790 jio_snprintf(message, msglen, "%s%s", desc, className);
791 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message);
792 }
793 }
794
795 // Step 6
796 this_k->set_init_state(being_initialized);
797 this_k->set_init_thread(self);
798 }
799
800 // Step 7
801 Klass* super_klass = this_k->super();
802 if (super_klass != NULL && !this_k->is_interface() && super_klass->should_be_initialized()) {
803 super_klass->initialize(THREAD);
804
805 if (HAS_PENDING_EXCEPTION) {
806 Handle e(THREAD, PENDING_EXCEPTION);
807 CLEAR_PENDING_EXCEPTION;
808 {
809 EXCEPTION_MARK;
810 this_k->set_initialization_state_and_notify(initialization_error, THREAD); // Locks object, set state, and notify all waiting threads
811 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, superclass initialization error is thrown below
812 }
813 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, InstanceKlass::cast(this_k()), -1,wait);
814 THROW_OOP(e());
815 }
816 }
817
818 if (this_k->has_default_methods()) {
819 // Step 7.5: initialize any interfaces which have default methods
820 for (int i = 0; i < this_k->local_interfaces()->length(); ++i) {
821 Klass* iface = this_k->local_interfaces()->at(i);
822 InstanceKlass* ik = InstanceKlass::cast(iface);
823 if (ik->has_default_methods() && ik->should_be_initialized()) {
824 ik->initialize(THREAD);
825
826 if (HAS_PENDING_EXCEPTION) {
827 Handle e(THREAD, PENDING_EXCEPTION);
828 CLEAR_PENDING_EXCEPTION;
829 {
830 EXCEPTION_MARK;
831 // Locks object, set state, and notify all waiting threads
832 this_k->set_initialization_state_and_notify(
833 initialization_error, THREAD);
834
835 // ignore any exception thrown, superclass initialization error is
836 // thrown below
837 CLEAR_PENDING_EXCEPTION;
838 }
839 DTRACE_CLASSINIT_PROBE_WAIT(
840 super__failed, InstanceKlass::cast(this_k()), -1, wait);
841 THROW_OOP(e());
842 }
843 }
844 }
845 }
846
847 // Step 8
848 {
849 assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl");
850 JavaThread* jt = (JavaThread*)THREAD;
851 DTRACE_CLASSINIT_PROBE_WAIT(clinit, InstanceKlass::cast(this_k()), -1,wait);
852 // Timer includes any side effects of class initialization (resolution,
853 // etc), but not recursive entry into call_class_initializer().
854 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
855 ClassLoader::perf_class_init_selftime(),
856 ClassLoader::perf_classes_inited(),
857 jt->get_thread_stat()->perf_recursion_counts_addr(),
858 jt->get_thread_stat()->perf_timers_addr(),
859 PerfClassTraceTime::CLASS_CLINIT);
860 this_k->call_class_initializer(THREAD);
861 }
862
863 // Step 9
864 if (!HAS_PENDING_EXCEPTION) {
865 this_k->set_initialization_state_and_notify(fully_initialized, CHECK);
866 { ResourceMark rm(THREAD);
867 debug_only(this_k->vtable()->verify(tty, true);)
868 }
869 }
870 else {
871 // Step 10 and 11
872 Handle e(THREAD, PENDING_EXCEPTION);
873 CLEAR_PENDING_EXCEPTION;
874 // JVMTI has already reported the pending exception
875 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
876 JvmtiExport::clear_detected_exception((JavaThread*)THREAD);
877 {
878 EXCEPTION_MARK;
879 this_k->set_initialization_state_and_notify(initialization_error, THREAD);
880 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below
881 // JVMTI has already reported the pending exception
882 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
883 JvmtiExport::clear_detected_exception((JavaThread*)THREAD);
884 }
885 DTRACE_CLASSINIT_PROBE_WAIT(error, InstanceKlass::cast(this_k()), -1,wait);
886 if (e->is_a(SystemDictionary::Error_klass())) {
887 THROW_OOP(e());
888 } else {
889 JavaCallArguments args(e);
890 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
891 vmSymbols::throwable_void_signature(),
892 &args);
893 }
894 }
895 DTRACE_CLASSINIT_PROBE_WAIT(end, InstanceKlass::cast(this_k()), -1,wait);
896 }
897
898
899 // Note: implementation moved to static method to expose the this pointer.
900 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) {
901 instanceKlassHandle kh(THREAD, this);
902 set_initialization_state_and_notify_impl(kh, state, CHECK);
903 }
904
905 void InstanceKlass::set_initialization_state_and_notify_impl(instanceKlassHandle this_k, ClassState state, TRAPS) {
906 oop init_lock = this_k->init_lock();
907 ObjectLocker ol(init_lock, THREAD, init_lock != NULL);
908 this_k->set_init_state(state);
909 this_k->fence_and_clear_init_lock();
910 ol.notify_all(CHECK);
911 }
912
913 // The embedded _implementor field can only record one implementor.
914 // When there are more than one implementors, the _implementor field
915 // is set to the interface Klass* itself. Following are the possible
916 // values for the _implementor field:
917 // NULL - no implementor
918 // implementor Klass* - one implementor
919 // self - more than one implementor
920 //
921 // The _implementor field only exists for interfaces.
922 void InstanceKlass::add_implementor(Klass* k) {
923 assert(Compile_lock->owned_by_self(), "");
924 assert(is_interface(), "not interface");
925 // Filter out my subinterfaces.
926 // (Note: Interfaces are never on the subklass list.)
927 if (InstanceKlass::cast(k)->is_interface()) return;
928
929 // Filter out subclasses whose supers already implement me.
930 // (Note: CHA must walk subclasses of direct implementors
931 // in order to locate indirect implementors.)
932 Klass* sk = InstanceKlass::cast(k)->super();
933 if (sk != NULL && InstanceKlass::cast(sk)->implements_interface(this))
934 // We only need to check one immediate superclass, since the
935 // implements_interface query looks at transitive_interfaces.
936 // Any supers of the super have the same (or fewer) transitive_interfaces.
937 return;
938
939 Klass* ik = implementor();
940 if (ik == NULL) {
941 set_implementor(k);
942 } else if (ik != this) {
943 // There is already an implementor. Use itself as an indicator of
944 // more than one implementors.
945 set_implementor(this);
946 }
947
948 // The implementor also implements the transitive_interfaces
949 for (int index = 0; index < local_interfaces()->length(); index++) {
950 InstanceKlass::cast(local_interfaces()->at(index))->add_implementor(k);
951 }
952 }
953
954 void InstanceKlass::init_implementor() {
955 if (is_interface()) {
956 set_implementor(NULL);
957 }
958 }
959
960
961 void InstanceKlass::process_interfaces(Thread *thread) {
962 // link this class into the implementors list of every interface it implements
963 for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
964 assert(local_interfaces()->at(i)->is_klass(), "must be a klass");
965 InstanceKlass* interf = InstanceKlass::cast(local_interfaces()->at(i));
966 assert(interf->is_interface(), "expected interface");
967 interf->add_implementor(this);
968 }
969 }
970
971 bool InstanceKlass::can_be_primary_super_slow() const {
972 if (is_interface())
973 return false;
974 else
975 return Klass::can_be_primary_super_slow();
976 }
977
978 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots) {
979 // The secondaries are the implemented interfaces.
980 InstanceKlass* ik = InstanceKlass::cast(this);
981 Array<Klass*>* interfaces = ik->transitive_interfaces();
982 int num_secondaries = num_extra_slots + interfaces->length();
983 if (num_secondaries == 0) {
984 // Must share this for correct bootstrapping!
985 set_secondary_supers(Universe::the_empty_klass_array());
986 return NULL;
987 } else if (num_extra_slots == 0) {
988 // The secondary super list is exactly the same as the transitive interfaces.
989 // Redefine classes has to be careful not to delete this!
990 set_secondary_supers(interfaces);
991 return NULL;
992 } else {
993 // Copy transitive interfaces to a temporary growable array to be constructed
994 // into the secondary super list with extra slots.
995 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length());
996 for (int i = 0; i < interfaces->length(); i++) {
997 secondaries->push(interfaces->at(i));
998 }
999 return secondaries;
1000 }
1001 }
1002
1003 bool InstanceKlass::compute_is_subtype_of(Klass* k) {
1004 if (k->is_interface()) {
1005 return implements_interface(k);
1006 } else {
1007 return Klass::compute_is_subtype_of(k);
1008 }
1009 }
1010
1011 bool InstanceKlass::implements_interface(Klass* k) const {
1012 if (this == k) return true;
1013 assert(k->is_interface(), "should be an interface class");
1014 for (int i = 0; i < transitive_interfaces()->length(); i++) {
1015 if (transitive_interfaces()->at(i) == k) {
1016 return true;
1017 }
1018 }
1019 return false;
1020 }
1021
1022 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const {
1023 // Verify direct super interface
1024 if (this == k) return true;
1025 assert(k->is_interface(), "should be an interface class");
1026 for (int i = 0; i < local_interfaces()->length(); i++) {
1027 if (local_interfaces()->at(i) == k) {
1028 return true;
1029 }
1030 }
1031 return false;
1032 }
1033
1034 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) {
1035 if (length < 0) THROW_0(vmSymbols::java_lang_NegativeArraySizeException());
1036 if (length > arrayOopDesc::max_array_length(T_OBJECT)) {
1037 report_java_out_of_memory("Requested array size exceeds VM limit");
1038 JvmtiExport::post_array_size_exhausted();
1039 THROW_OOP_0(Universe::out_of_memory_error_array_size());
1040 }
1041 int size = objArrayOopDesc::object_size(length);
1042 Klass* ak = array_klass(n, CHECK_NULL);
1043 KlassHandle h_ak (THREAD, ak);
1044 objArrayOop o =
1045 (objArrayOop)CollectedHeap::array_allocate(h_ak, size, length, CHECK_NULL);
1046 return o;
1047 }
1048
1049 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
1050 if (TraceFinalizerRegistration) {
1051 tty->print("Registered ");
1052 i->print_value_on(tty);
1053 tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", (address)i);
1054 }
1055 instanceHandle h_i(THREAD, i);
1056 // Pass the handle as argument, JavaCalls::call expects oop as jobjects
1057 JavaValue result(T_VOID);
1058 JavaCallArguments args(h_i);
1059 methodHandle mh (THREAD, Universe::finalizer_register_method());
1060 JavaCalls::call(&result, mh, &args, CHECK_NULL);
1061 return h_i();
1062 }
1063
1064 instanceOop InstanceKlass::allocate_instance(TRAPS) {
1065 bool has_finalizer_flag = has_finalizer(); // Query before possible GC
1066 int size = size_helper(); // Query before forming handle.
1067
1068 KlassHandle h_k(THREAD, this);
1069
1070 instanceOop i;
1071
1072 i = (instanceOop)CollectedHeap::obj_allocate(h_k, size, CHECK_NULL);
1073 if (has_finalizer_flag && !RegisterFinalizersAtInit) {
1074 i = register_finalizer(i, CHECK_NULL);
1075 }
1076 return i;
1077 }
1078
1079 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1080 if (is_interface() || is_abstract()) {
1081 ResourceMark rm(THREAD);
1082 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1083 : vmSymbols::java_lang_InstantiationException(), external_name());
1084 }
1085 if (this == SystemDictionary::Class_klass()) {
1086 ResourceMark rm(THREAD);
1087 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1088 : vmSymbols::java_lang_IllegalAccessException(), external_name());
1089 }
1090 }
1091
1092 Klass* InstanceKlass::array_klass_impl(bool or_null, int n, TRAPS) {
1093 instanceKlassHandle this_k(THREAD, this);
1094 return array_klass_impl(this_k, or_null, n, THREAD);
1095 }
1096
1097 Klass* InstanceKlass::array_klass_impl(instanceKlassHandle this_k, bool or_null, int n, TRAPS) {
1098 if (this_k->array_klasses() == NULL) {
1099 if (or_null) return NULL;
1100
1101 ResourceMark rm;
1102 JavaThread *jt = (JavaThread *)THREAD;
1103 {
1104 // Atomic creation of array_klasses
1105 MutexLocker mc(Compile_lock, THREAD); // for vtables
1106 MutexLocker ma(MultiArray_lock, THREAD);
1107
1108 // Check if update has already taken place
1109 if (this_k->array_klasses() == NULL) {
1110 Klass* k = ObjArrayKlass::allocate_objArray_klass(this_k->class_loader_data(), 1, this_k, CHECK_NULL);
1111 this_k->set_array_klasses(k);
1112 }
1113 }
1114 }
1115 // _this will always be set at this point
1116 ObjArrayKlass* oak = (ObjArrayKlass*)this_k->array_klasses();
1117 if (or_null) {
1118 return oak->array_klass_or_null(n);
1119 }
1120 return oak->array_klass(n, CHECK_NULL);
1121 }
1122
1123 Klass* InstanceKlass::array_klass_impl(bool or_null, TRAPS) {
1124 return array_klass_impl(or_null, 1, THREAD);
1125 }
1126
1127 void InstanceKlass::call_class_initializer(TRAPS) {
1128 instanceKlassHandle ik (THREAD, this);
1129 call_class_initializer_impl(ik, THREAD);
1130 }
1131
1132 static int call_class_initializer_impl_counter = 0; // for debugging
1133
1134 Method* InstanceKlass::class_initializer() {
1135 Method* clinit = find_method(
1136 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1137 if (clinit != NULL && clinit->has_valid_initializer_flags()) {
1138 return clinit;
1139 }
1140 return NULL;
1141 }
1142
1143 void InstanceKlass::call_class_initializer_impl(instanceKlassHandle this_k, TRAPS) {
1144 if (ReplayCompiles &&
1145 (ReplaySuppressInitializers == 1 ||
1146 ReplaySuppressInitializers >= 2 && this_k->class_loader() != NULL)) {
1147 // Hide the existence of the initializer for the purpose of replaying the compile
1148 return;
1149 }
1150
1151 methodHandle h_method(THREAD, this_k->class_initializer());
1152 assert(!this_k->is_initialized(), "we cannot initialize twice");
1153 if (TraceClassInitialization) {
1154 tty->print("%d Initializing ", call_class_initializer_impl_counter++);
1155 this_k->name()->print_value();
1156 tty->print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", (address)this_k());
1157 }
1158 if (h_method() != NULL) {
1159 JavaCallArguments args; // No arguments
1160 JavaValue result(T_VOID);
1161 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1162 }
1163 }
1164
1165
1166 void InstanceKlass::mask_for(methodHandle method, int bci,
1167 InterpreterOopMap* entry_for) {
1168 // Dirty read, then double-check under a lock.
1169 if (_oop_map_cache == NULL) {
1170 // Otherwise, allocate a new one.
1171 MutexLocker x(OopMapCacheAlloc_lock);
1172 // First time use. Allocate a cache in C heap
1173 if (_oop_map_cache == NULL) {
1174 // Release stores from OopMapCache constructor before assignment
1175 // to _oop_map_cache. C++ compilers on ppc do not emit the
1176 // required memory barrier only because of the volatile
1177 // qualifier of _oop_map_cache.
1178 OrderAccess::release_store_ptr(&_oop_map_cache, new OopMapCache());
1179 }
1180 }
1181 // _oop_map_cache is constant after init; lookup below does is own locking.
1182 _oop_map_cache->lookup(method, bci, entry_for);
1183 }
1184
1185
1186 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1187 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1188 Symbol* f_name = fs.name();
1189 Symbol* f_sig = fs.signature();
1190 if (f_name == name && f_sig == sig) {
1191 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1192 return true;
1193 }
1194 }
1195 return false;
1196 }
1197
1198
1199 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1200 const int n = local_interfaces()->length();
1201 for (int i = 0; i < n; i++) {
1202 Klass* intf1 = local_interfaces()->at(i);
1203 assert(intf1->is_interface(), "just checking type");
1204 // search for field in current interface
1205 if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) {
1206 assert(fd->is_static(), "interface field must be static");
1207 return intf1;
1208 }
1209 // search for field in direct superinterfaces
1210 Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd);
1211 if (intf2 != NULL) return intf2;
1212 }
1213 // otherwise field lookup fails
1214 return NULL;
1215 }
1216
1217
1218 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1219 // search order according to newest JVM spec (5.4.3.2, p.167).
1220 // 1) search for field in current klass
1221 if (find_local_field(name, sig, fd)) {
1222 return const_cast<InstanceKlass*>(this);
1223 }
1224 // 2) search for field recursively in direct superinterfaces
1225 { Klass* intf = find_interface_field(name, sig, fd);
1226 if (intf != NULL) return intf;
1227 }
1228 // 3) apply field lookup recursively if superclass exists
1229 { Klass* supr = super();
1230 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, fd);
1231 }
1232 // 4) otherwise field lookup fails
1233 return NULL;
1234 }
1235
1236
1237 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
1238 // search order according to newest JVM spec (5.4.3.2, p.167).
1239 // 1) search for field in current klass
1240 if (find_local_field(name, sig, fd)) {
1241 if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
1242 }
1243 // 2) search for field recursively in direct superinterfaces
1244 if (is_static) {
1245 Klass* intf = find_interface_field(name, sig, fd);
1246 if (intf != NULL) return intf;
1247 }
1248 // 3) apply field lookup recursively if superclass exists
1249 { Klass* supr = super();
1250 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd);
1251 }
1252 // 4) otherwise field lookup fails
1253 return NULL;
1254 }
1255
1256
1257 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1258 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1259 if (fs.offset() == offset) {
1260 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1261 if (fd->is_static() == is_static) return true;
1262 }
1263 }
1264 return false;
1265 }
1266
1267
1268 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1269 Klass* klass = const_cast<InstanceKlass*>(this);
1270 while (klass != NULL) {
1271 if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) {
1272 return true;
1273 }
1274 klass = klass->super();
1275 }
1276 return false;
1277 }
1278
1279
1280 void InstanceKlass::methods_do(void f(Method* method)) {
1281 // Methods aren't stable until they are loaded. This can be read outside
1282 // a lock through the ClassLoaderData for profiling
1283 if (!is_loaded()) {
1284 return;
1285 }
1286
1287 int len = methods()->length();
1288 for (int index = 0; index < len; index++) {
1289 Method* m = methods()->at(index);
1290 assert(m->is_method(), "must be method");
1291 f(m);
1292 }
1293 }
1294
1295
1296 void InstanceKlass::do_local_static_fields(FieldClosure* cl) {
1297 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1298 if (fs.access_flags().is_static()) {
1299 fieldDescriptor& fd = fs.field_descriptor();
1300 cl->do_field(&fd);
1301 }
1302 }
1303 }
1304
1305
1306 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) {
1307 instanceKlassHandle h_this(THREAD, this);
1308 do_local_static_fields_impl(h_this, f, mirror, CHECK);
1309 }
1310
1311
1312 void InstanceKlass::do_local_static_fields_impl(instanceKlassHandle this_k,
1313 void f(fieldDescriptor* fd, Handle, TRAPS), Handle mirror, TRAPS) {
1314 for (JavaFieldStream fs(this_k()); !fs.done(); fs.next()) {
1315 if (fs.access_flags().is_static()) {
1316 fieldDescriptor& fd = fs.field_descriptor();
1317 f(&fd, mirror, CHECK);
1318 }
1319 }
1320 }
1321
1322
1323 static int compare_fields_by_offset(int* a, int* b) {
1324 return a[0] - b[0];
1325 }
1326
1327 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) {
1328 InstanceKlass* super = superklass();
1329 if (super != NULL) {
1330 super->do_nonstatic_fields(cl);
1331 }
1332 fieldDescriptor fd;
1333 int length = java_fields_count();
1334 // In DebugInfo nonstatic fields are sorted by offset.
1335 int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1), mtClass);
1336 int j = 0;
1337 for (int i = 0; i < length; i += 1) {
1338 fd.reinitialize(this, i);
1339 if (!fd.is_static()) {
1340 fields_sorted[j + 0] = fd.offset();
1341 fields_sorted[j + 1] = i;
1342 j += 2;
1343 }
1344 }
1345 if (j > 0) {
1346 length = j;
1347 // _sort_Fn is defined in growableArray.hpp.
1348 qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset);
1349 for (int i = 0; i < length; i += 2) {
1350 fd.reinitialize(this, fields_sorted[i + 1]);
1351 assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields");
1352 cl->do_field(&fd);
1353 }
1354 }
1355 FREE_C_HEAP_ARRAY(int, fields_sorted, mtClass);
1356 }
1357
1358
1359 void InstanceKlass::array_klasses_do(void f(Klass* k, TRAPS), TRAPS) {
1360 if (array_klasses() != NULL)
1361 ArrayKlass::cast(array_klasses())->array_klasses_do(f, THREAD);
1362 }
1363
1364 void InstanceKlass::array_klasses_do(void f(Klass* k)) {
1365 if (array_klasses() != NULL)
1366 ArrayKlass::cast(array_klasses())->array_klasses_do(f);
1367 }
1368
1369 #ifdef ASSERT
1370 static int linear_search(Array<Method*>* methods, Symbol* name, Symbol* signature) {
1371 int len = methods->length();
1372 for (int index = 0; index < len; index++) {
1373 Method* m = methods->at(index);
1374 assert(m->is_method(), "must be method");
1375 if (m->signature() == signature && m->name() == name) {
1376 return index;
1377 }
1378 }
1379 return -1;
1380 }
1381 #endif
1382
1383 static int binary_search(Array<Method*>* methods, Symbol* name) {
1384 int len = methods->length();
1385 // methods are sorted, so do binary search
1386 int l = 0;
1387 int h = len - 1;
1388 while (l <= h) {
1389 int mid = (l + h) >> 1;
1390 Method* m = methods->at(mid);
1391 assert(m->is_method(), "must be method");
1392 int res = m->name()->fast_compare(name);
1393 if (res == 0) {
1394 return mid;
1395 } else if (res < 0) {
1396 l = mid + 1;
1397 } else {
1398 h = mid - 1;
1399 }
1400 }
1401 return -1;
1402 }
1403
1404 // find_method looks up the name/signature in the local methods array
1405 Method* InstanceKlass::find_method(Symbol* name, Symbol* signature) const {
1406 return find_method_impl(name, signature, false);
1407 }
1408
1409 Method* InstanceKlass::find_method_impl(Symbol* name, Symbol* signature, bool skipping_overpass) const {
1410 return InstanceKlass::find_method_impl(methods(), name, signature, skipping_overpass);
1411 }
1412
1413 // find_instance_method looks up the name/signature in the local methods array
1414 // and skips over static methods
1415 Method* InstanceKlass::find_instance_method(
1416 Array<Method*>* methods, Symbol* name, Symbol* signature) {
1417 Method* meth = InstanceKlass::find_method(methods, name, signature);
1418 if (meth != NULL && meth->is_static()) {
1419 meth = NULL;
1420 }
1421 return meth;
1422 }
1423
1424 // find_method looks up the name/signature in the local methods array
1425 Method* InstanceKlass::find_method(
1426 Array<Method*>* methods, Symbol* name, Symbol* signature) {
1427 return InstanceKlass::find_method_impl(methods, name, signature, false);
1428 }
1429
1430 Method* InstanceKlass::find_method_impl(
1431 Array<Method*>* methods, Symbol* name, Symbol* signature, bool skipping_overpass) {
1432 int hit = find_method_index(methods, name, signature, skipping_overpass);
1433 return hit >= 0 ? methods->at(hit): NULL;
1434 }
1435
1436 // Used directly for default_methods to find the index into the
1437 // default_vtable_indices, and indirectly by find_method
1438 // find_method_index looks in the local methods array to return the index
1439 // of the matching name/signature. If, overpass methods are being ignored,
1440 // the search continues to find a potential non-overpass match. This capability
1441 // is important during method resolution to prefer a static method, for example,
1442 // over an overpass method.
1443 int InstanceKlass::find_method_index(
1444 Array<Method*>* methods, Symbol* name, Symbol* signature, bool skipping_overpass) {
1445 int hit = binary_search(methods, name);
1446 if (hit != -1) {
1447 Method* m = methods->at(hit);
1448 // Do linear search to find matching signature. First, quick check
1449 // for common case, ignoring overpasses if requested.
1450 if ((m->signature() == signature) && (!skipping_overpass || !m->is_overpass())) return hit;
1451
1452 // search downwards through overloaded methods
1453 int i;
1454 for (i = hit - 1; i >= 0; --i) {
1455 Method* m = methods->at(i);
1456 assert(m->is_method(), "must be method");
1457 if (m->name() != name) break;
1458 if ((m->signature() == signature) && (!skipping_overpass || !m->is_overpass())) return i;
1459 }
1460 // search upwards
1461 for (i = hit + 1; i < methods->length(); ++i) {
1462 Method* m = methods->at(i);
1463 assert(m->is_method(), "must be method");
1464 if (m->name() != name) break;
1465 if ((m->signature() == signature) && (!skipping_overpass || !m->is_overpass())) return i;
1466 }
1467 // not found
1468 #ifdef ASSERT
1469 int index = skipping_overpass ? -1 : linear_search(methods, name, signature);
1470 assert(index == -1, err_msg("binary search should have found entry %d", index));
1471 #endif
1472 }
1473 return -1;
1474 }
1475 int InstanceKlass::find_method_by_name(Symbol* name, int* end) {
1476 return find_method_by_name(methods(), name, end);
1477 }
1478
1479 int InstanceKlass::find_method_by_name(
1480 Array<Method*>* methods, Symbol* name, int* end_ptr) {
1481 assert(end_ptr != NULL, "just checking");
1482 int start = binary_search(methods, name);
1483 int end = start + 1;
1484 if (start != -1) {
1485 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
1486 while (end < methods->length() && (methods->at(end))->name() == name) ++end;
1487 *end_ptr = end;
1488 return start;
1489 }
1490 return -1;
1491 }
1492
1493 // uncached_lookup_method searches both the local class methods array and all
1494 // superclasses methods arrays, skipping any overpass methods in superclasses.
1495 Method* InstanceKlass::uncached_lookup_method(Symbol* name, Symbol* signature, MethodLookupMode mode) const {
1496 MethodLookupMode lookup_mode = mode;
1497 Klass* klass = const_cast<InstanceKlass*>(this);
1498 while (klass != NULL) {
1499 Method* method = InstanceKlass::cast(klass)->find_method_impl(name, signature, (lookup_mode == skip_overpass));
1500 if (method != NULL) {
1501 return method;
1502 }
1503 klass = InstanceKlass::cast(klass)->super();
1504 lookup_mode = skip_overpass; // Always ignore overpass methods in superclasses
1505 }
1506 return NULL;
1507 }
1508
1509 #ifdef ASSERT
1510 // search through class hierarchy and return true if this class or
1511 // one of the superclasses was redefined
1512 bool InstanceKlass::has_redefined_this_or_super() const {
1513 const InstanceKlass* klass = this;
1514 while (klass != NULL) {
1515 if (klass->has_been_redefined()) {
1516 return true;
1517 }
1518 klass = InstanceKlass::cast(klass->super());
1519 }
1520 return false;
1521 }
1522 #endif
1523
1524 // lookup a method in the default methods list then in all transitive interfaces
1525 // Do NOT return private or static methods
1526 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
1527 Symbol* signature) const {
1528 Method* m = NULL;
1529 if (default_methods() != NULL) {
1530 m = find_method(default_methods(), name, signature);
1531 }
1532 // Look up interfaces
1533 if (m == NULL) {
1534 m = lookup_method_in_all_interfaces(name, signature, normal);
1535 }
1536 return m;
1537 }
1538
1539 // lookup a method in all the interfaces that this class implements
1540 // Do NOT return private or static methods, new in JDK8 which are not externally visible
1541 // They should only be found in the initial InterfaceMethodRef
1542 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
1543 Symbol* signature,
1544 MethodLookupMode mode) const {
1545 Array<Klass*>* all_ifs = transitive_interfaces();
1546 int num_ifs = all_ifs->length();
1547 InstanceKlass *ik = NULL;
1548 for (int i = 0; i < num_ifs; i++) {
1549 ik = InstanceKlass::cast(all_ifs->at(i));
1550 Method* m = ik->lookup_method(name, signature);
1551 if (m != NULL && m->is_public() && !m->is_static() &&
1552 ((mode != skip_defaults) || !m->is_default_method())) {
1553 return m;
1554 }
1555 }
1556 return NULL;
1557 }
1558
1559 /* jni_id_for_impl for jfieldIds only */
1560 JNIid* InstanceKlass::jni_id_for_impl(instanceKlassHandle this_k, int offset) {
1561 MutexLocker ml(JfieldIdCreation_lock);
1562 // Retry lookup after we got the lock
1563 JNIid* probe = this_k->jni_ids() == NULL ? NULL : this_k->jni_ids()->find(offset);
1564 if (probe == NULL) {
1565 // Slow case, allocate new static field identifier
1566 probe = new JNIid(this_k(), offset, this_k->jni_ids());
1567 this_k->set_jni_ids(probe);
1568 }
1569 return probe;
1570 }
1571
1572
1573 /* jni_id_for for jfieldIds only */
1574 JNIid* InstanceKlass::jni_id_for(int offset) {
1575 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
1576 if (probe == NULL) {
1577 probe = jni_id_for_impl(this, offset);
1578 }
1579 return probe;
1580 }
1581
1582 u2 InstanceKlass::enclosing_method_data(int offset) {
1583 Array<jushort>* inner_class_list = inner_classes();
1584 if (inner_class_list == NULL) {
1585 return 0;
1586 }
1587 int length = inner_class_list->length();
1588 if (length % inner_class_next_offset == 0) {
1589 return 0;
1590 } else {
1591 int index = length - enclosing_method_attribute_size;
1592 assert(offset < enclosing_method_attribute_size, "invalid offset");
1593 return inner_class_list->at(index + offset);
1594 }
1595 }
1596
1597 void InstanceKlass::set_enclosing_method_indices(u2 class_index,
1598 u2 method_index) {
1599 Array<jushort>* inner_class_list = inner_classes();
1600 assert (inner_class_list != NULL, "_inner_classes list is not set up");
1601 int length = inner_class_list->length();
1602 if (length % inner_class_next_offset == enclosing_method_attribute_size) {
1603 int index = length - enclosing_method_attribute_size;
1604 inner_class_list->at_put(
1605 index + enclosing_method_class_index_offset, class_index);
1606 inner_class_list->at_put(
1607 index + enclosing_method_method_index_offset, method_index);
1608 }
1609 }
1610
1611 // Lookup or create a jmethodID.
1612 // This code is called by the VMThread and JavaThreads so the
1613 // locking has to be done very carefully to avoid deadlocks
1614 // and/or other cache consistency problems.
1615 //
1616 jmethodID InstanceKlass::get_jmethod_id(instanceKlassHandle ik_h, methodHandle method_h) {
1617 size_t idnum = (size_t)method_h->method_idnum();
1618 jmethodID* jmeths = ik_h->methods_jmethod_ids_acquire();
1619 size_t length = 0;
1620 jmethodID id = NULL;
1621
1622 // We use a double-check locking idiom here because this cache is
1623 // performance sensitive. In the normal system, this cache only
1624 // transitions from NULL to non-NULL which is safe because we use
1625 // release_set_methods_jmethod_ids() to advertise the new cache.
1626 // A partially constructed cache should never be seen by a racing
1627 // thread. We also use release_store_ptr() to save a new jmethodID
1628 // in the cache so a partially constructed jmethodID should never be
1629 // seen either. Cache reads of existing jmethodIDs proceed without a
1630 // lock, but cache writes of a new jmethodID requires uniqueness and
1631 // creation of the cache itself requires no leaks so a lock is
1632 // generally acquired in those two cases.
1633 //
1634 // If the RedefineClasses() API has been used, then this cache can
1635 // grow and we'll have transitions from non-NULL to bigger non-NULL.
1636 // Cache creation requires no leaks and we require safety between all
1637 // cache accesses and freeing of the old cache so a lock is generally
1638 // acquired when the RedefineClasses() API has been used.
1639
1640 if (jmeths != NULL) {
1641 // the cache already exists
1642 if (!ik_h->idnum_can_increment()) {
1643 // the cache can't grow so we can just get the current values
1644 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
1645 } else {
1646 // cache can grow so we have to be more careful
1647 if (Threads::number_of_threads() == 0 ||
1648 SafepointSynchronize::is_at_safepoint()) {
1649 // we're single threaded or at a safepoint - no locking needed
1650 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
1651 } else {
1652 MutexLocker ml(JmethodIdCreation_lock);
1653 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
1654 }
1655 }
1656 }
1657 // implied else:
1658 // we need to allocate a cache so default length and id values are good
1659
1660 if (jmeths == NULL || // no cache yet
1661 length <= idnum || // cache is too short
1662 id == NULL) { // cache doesn't contain entry
1663
1664 // This function can be called by the VMThread so we have to do all
1665 // things that might block on a safepoint before grabbing the lock.
1666 // Otherwise, we can deadlock with the VMThread or have a cache
1667 // consistency issue. These vars keep track of what we might have
1668 // to free after the lock is dropped.
1669 jmethodID to_dealloc_id = NULL;
1670 jmethodID* to_dealloc_jmeths = NULL;
1671
1672 // may not allocate new_jmeths or use it if we allocate it
1673 jmethodID* new_jmeths = NULL;
1674 if (length <= idnum) {
1675 // allocate a new cache that might be used
1676 size_t size = MAX2(idnum+1, (size_t)ik_h->idnum_allocated_count());
1677 new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1, mtClass);
1678 memset(new_jmeths, 0, (size+1)*sizeof(jmethodID));
1679 // cache size is stored in element[0], other elements offset by one
1680 new_jmeths[0] = (jmethodID)size;
1681 }
1682
1683 // allocate a new jmethodID that might be used
1684 jmethodID new_id = NULL;
1685 if (method_h->is_old() && !method_h->is_obsolete()) {
1686 // The method passed in is old (but not obsolete), we need to use the current version
1687 Method* current_method = ik_h->method_with_idnum((int)idnum);
1688 assert(current_method != NULL, "old and but not obsolete, so should exist");
1689 new_id = Method::make_jmethod_id(ik_h->class_loader_data(), current_method);
1690 } else {
1691 // It is the current version of the method or an obsolete method,
1692 // use the version passed in
1693 new_id = Method::make_jmethod_id(ik_h->class_loader_data(), method_h());
1694 }
1695
1696 if (Threads::number_of_threads() == 0 ||
1697 SafepointSynchronize::is_at_safepoint()) {
1698 // we're single threaded or at a safepoint - no locking needed
1699 id = get_jmethod_id_fetch_or_update(ik_h, idnum, new_id, new_jmeths,
1700 &to_dealloc_id, &to_dealloc_jmeths);
1701 } else {
1702 MutexLocker ml(JmethodIdCreation_lock);
1703 id = get_jmethod_id_fetch_or_update(ik_h, idnum, new_id, new_jmeths,
1704 &to_dealloc_id, &to_dealloc_jmeths);
1705 }
1706
1707 // The lock has been dropped so we can free resources.
1708 // Free up either the old cache or the new cache if we allocated one.
1709 if (to_dealloc_jmeths != NULL) {
1710 FreeHeap(to_dealloc_jmeths);
1711 }
1712 // free up the new ID since it wasn't needed
1713 if (to_dealloc_id != NULL) {
1714 Method::destroy_jmethod_id(ik_h->class_loader_data(), to_dealloc_id);
1715 }
1716 }
1717 return id;
1718 }
1719
1720
1721 // Common code to fetch the jmethodID from the cache or update the
1722 // cache with the new jmethodID. This function should never do anything
1723 // that causes the caller to go to a safepoint or we can deadlock with
1724 // the VMThread or have cache consistency issues.
1725 //
1726 jmethodID InstanceKlass::get_jmethod_id_fetch_or_update(
1727 instanceKlassHandle ik_h, size_t idnum, jmethodID new_id,
1728 jmethodID* new_jmeths, jmethodID* to_dealloc_id_p,
1729 jmethodID** to_dealloc_jmeths_p) {
1730 assert(new_id != NULL, "sanity check");
1731 assert(to_dealloc_id_p != NULL, "sanity check");
1732 assert(to_dealloc_jmeths_p != NULL, "sanity check");
1733 assert(Threads::number_of_threads() == 0 ||
1734 SafepointSynchronize::is_at_safepoint() ||
1735 JmethodIdCreation_lock->owned_by_self(), "sanity check");
1736
1737 // reacquire the cache - we are locked, single threaded or at a safepoint
1738 jmethodID* jmeths = ik_h->methods_jmethod_ids_acquire();
1739 jmethodID id = NULL;
1740 size_t length = 0;
1741
1742 if (jmeths == NULL || // no cache yet
1743 (length = (size_t)jmeths[0]) <= idnum) { // cache is too short
1744 if (jmeths != NULL) {
1745 // copy any existing entries from the old cache
1746 for (size_t index = 0; index < length; index++) {
1747 new_jmeths[index+1] = jmeths[index+1];
1748 }
1749 *to_dealloc_jmeths_p = jmeths; // save old cache for later delete
1750 }
1751 ik_h->release_set_methods_jmethod_ids(jmeths = new_jmeths);
1752 } else {
1753 // fetch jmethodID (if any) from the existing cache
1754 id = jmeths[idnum+1];
1755 *to_dealloc_jmeths_p = new_jmeths; // save new cache for later delete
1756 }
1757 if (id == NULL) {
1758 // No matching jmethodID in the existing cache or we have a new
1759 // cache or we just grew the cache. This cache write is done here
1760 // by the first thread to win the foot race because a jmethodID
1761 // needs to be unique once it is generally available.
1762 id = new_id;
1763
1764 // The jmethodID cache can be read while unlocked so we have to
1765 // make sure the new jmethodID is complete before installing it
1766 // in the cache.
1767 OrderAccess::release_store_ptr(&jmeths[idnum+1], id);
1768 } else {
1769 *to_dealloc_id_p = new_id; // save new id for later delete
1770 }
1771 return id;
1772 }
1773
1774
1775 // Common code to get the jmethodID cache length and the jmethodID
1776 // value at index idnum if there is one.
1777 //
1778 void InstanceKlass::get_jmethod_id_length_value(jmethodID* cache,
1779 size_t idnum, size_t *length_p, jmethodID* id_p) {
1780 assert(cache != NULL, "sanity check");
1781 assert(length_p != NULL, "sanity check");
1782 assert(id_p != NULL, "sanity check");
1783
1784 // cache size is stored in element[0], other elements offset by one
1785 *length_p = (size_t)cache[0];
1786 if (*length_p <= idnum) { // cache is too short
1787 *id_p = NULL;
1788 } else {
1789 *id_p = cache[idnum+1]; // fetch jmethodID (if any)
1790 }
1791 }
1792
1793
1794 // Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles
1795 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
1796 size_t idnum = (size_t)method->method_idnum();
1797 jmethodID* jmeths = methods_jmethod_ids_acquire();
1798 size_t length; // length assigned as debugging crumb
1799 jmethodID id = NULL;
1800 if (jmeths != NULL && // If there is a cache
1801 (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough,
1802 id = jmeths[idnum+1]; // Look up the id (may be NULL)
1803 }
1804 return id;
1805 }
1806
1807 int nmethodBucket::decrement() {
1808 return Atomic::add(-1, (volatile int *)&_count);
1809 }
1810
1811 //
1812 // Walk the list of dependent nmethods searching for nmethods which
1813 // are dependent on the changes that were passed in and mark them for
1814 // deoptimization. Returns the number of nmethods found.
1815 //
1816 int InstanceKlass::mark_dependent_nmethods(DepChange& changes) {
1817 assert_locked_or_safepoint(CodeCache_lock);
1818 int found = 0;
1819 nmethodBucket* b = _dependencies;
1820 while (b != NULL) {
1821 nmethod* nm = b->get_nmethod();
1822 // since dependencies aren't removed until an nmethod becomes a zombie,
1823 // the dependency list may contain nmethods which aren't alive.
1824 if (b->count() > 0 && nm->is_alive() && !nm->is_marked_for_deoptimization() && nm->check_dependency_on(changes)) {
1825 if (TraceDependencies) {
1826 ResourceMark rm;
1827 tty->print_cr("Marked for deoptimization");
1828 tty->print_cr(" context = %s", this->external_name());
1829 changes.print();
1830 nm->print();
1831 nm->print_dependencies();
1832 }
1833 nm->mark_for_deoptimization();
1834 found++;
1835 }
1836 b = b->next();
1837 }
1838 return found;
1839 }
1840
1841 void InstanceKlass::clean_dependent_nmethods() {
1842 assert_locked_or_safepoint(CodeCache_lock);
1843
1844 if (has_unloaded_dependent()) {
1845 nmethodBucket* b = _dependencies;
1846 nmethodBucket* last = NULL;
1847 while (b != NULL) {
1848 assert(b->count() >= 0, err_msg("bucket count: %d", b->count()));
1849
1850 nmethodBucket* next = b->next();
1851
1852 if (b->count() == 0) {
1853 if (last == NULL) {
1854 _dependencies = next;
1855 } else {
1856 last->set_next(next);
1857 }
1858 delete b;
1859 // last stays the same.
1860 } else {
1861 last = b;
1862 }
1863
1864 b = next;
1865 }
1866 set_has_unloaded_dependent(false);
1867 }
1868 #ifdef ASSERT
1869 else {
1870 // Verification
1871 for (nmethodBucket* b = _dependencies; b != NULL; b = b->next()) {
1872 assert(b->count() >= 0, err_msg("bucket count: %d", b->count()));
1873 assert(b->count() != 0, "empty buckets need to be cleaned");
1874 }
1875 }
1876 #endif
1877 }
1878
1879 //
1880 // Add an nmethodBucket to the list of dependencies for this nmethod.
1881 // It's possible that an nmethod has multiple dependencies on this klass
1882 // so a count is kept for each bucket to guarantee that creation and
1883 // deletion of dependencies is consistent.
1884 //
1885 void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
1886 assert_locked_or_safepoint(CodeCache_lock);
1887 nmethodBucket* b = _dependencies;
1888 nmethodBucket* last = NULL;
1889 while (b != NULL) {
1890 if (nm == b->get_nmethod()) {
1891 b->increment();
1892 return;
1893 }
1894 b = b->next();
1895 }
1896 _dependencies = new nmethodBucket(nm, _dependencies);
1897 }
1898
1899
1900 //
1901 // Decrement count of the nmethod in the dependency list and remove
1902 // the bucket competely when the count goes to 0. This method must
1903 // find a corresponding bucket otherwise there's a bug in the
1904 // recording of dependecies.
1905 //
1906 void InstanceKlass::remove_dependent_nmethod(nmethod* nm) {
1907 assert_locked_or_safepoint(CodeCache_lock);
1908 nmethodBucket* b = _dependencies;
1909 nmethodBucket* last = NULL;
1910 while (b != NULL) {
1911 if (nm == b->get_nmethod()) {
1912 int val = b->decrement();
1913 guarantee(val >= 0, err_msg("Underflow: %d", val));
1914 if (val == 0) {
1915 set_has_unloaded_dependent(true);
1916 }
1917 return;
1918 }
1919 last = b;
1920 b = b->next();
1921 }
1922 #ifdef ASSERT
1923 tty->print_cr("### %s can't find dependent nmethod:", this->external_name());
1924 nm->print();
1925 #endif // ASSERT
1926 ShouldNotReachHere();
1927 }
1928
1929
1930 #ifndef PRODUCT
1931 void InstanceKlass::print_dependent_nmethods(bool verbose) {
1932 nmethodBucket* b = _dependencies;
1933 int idx = 0;
1934 while (b != NULL) {
1935 nmethod* nm = b->get_nmethod();
1936 tty->print("[%d] count=%d { ", idx++, b->count());
1937 if (!verbose) {
1938 nm->print_on(tty, "nmethod");
1939 tty->print_cr(" } ");
1940 } else {
1941 nm->print();
1942 nm->print_dependencies();
1943 tty->print_cr("--- } ");
1944 }
1945 b = b->next();
1946 }
1947 }
1948
1949
1950 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
1951 nmethodBucket* b = _dependencies;
1952 while (b != NULL) {
1953 if (nm == b->get_nmethod()) {
1954 #ifdef ASSERT
1955 int count = b->count();
1956 assert(count >= 0, err_msg("count shouldn't be negative: %d", count));
1957 #endif
1958 return true;
1959 }
1960 b = b->next();
1961 }
1962 return false;
1963 }
1964 #endif //PRODUCT
1965
1966
1967 // Garbage collection
1968
1969 #ifdef ASSERT
1970 template <class T> void assert_is_in(T *p) {
1971 T heap_oop = oopDesc::load_heap_oop(p);
1972 if (!oopDesc::is_null(heap_oop)) {
1973 oop o = oopDesc::decode_heap_oop_not_null(heap_oop);
1974 assert(Universe::heap()->is_in(o), "should be in heap");
1975 }
1976 }
1977 template <class T> void assert_is_in_closed_subset(T *p) {
1978 T heap_oop = oopDesc::load_heap_oop(p);
1979 if (!oopDesc::is_null(heap_oop)) {
1980 oop o = oopDesc::decode_heap_oop_not_null(heap_oop);
1981 assert(Universe::heap()->is_in_closed_subset(o),
1982 err_msg("should be in closed *p " INTPTR_FORMAT " " INTPTR_FORMAT, (address)p, (address)o));
1983 }
1984 }
1985 template <class T> void assert_is_in_reserved(T *p) {
1986 T heap_oop = oopDesc::load_heap_oop(p);
1987 if (!oopDesc::is_null(heap_oop)) {
1988 oop o = oopDesc::decode_heap_oop_not_null(heap_oop);
1989 assert(Universe::heap()->is_in_reserved(o), "should be in reserved");
1990 }
1991 }
1992 template <class T> void assert_nothing(T *p) {}
1993
1994 #else
1995 template <class T> void assert_is_in(T *p) {}
1996 template <class T> void assert_is_in_closed_subset(T *p) {}
1997 template <class T> void assert_is_in_reserved(T *p) {}
1998 template <class T> void assert_nothing(T *p) {}
1999 #endif // ASSERT
2000
2001 //
2002 // Macros that iterate over areas of oops which are specialized on type of
2003 // oop pointer either narrow or wide, depending on UseCompressedOops
2004 //
2005 // Parameters are:
2006 // T - type of oop to point to (either oop or narrowOop)
2007 // start_p - starting pointer for region to iterate over
2008 // count - number of oops or narrowOops to iterate over
2009 // do_oop - action to perform on each oop (it's arbitrary C code which
2010 // makes it more efficient to put in a macro rather than making
2011 // it a template function)
2012 // assert_fn - assert function which is template function because performance
2013 // doesn't matter when enabled.
2014 #define InstanceKlass_SPECIALIZED_OOP_ITERATE( \
2015 T, start_p, count, do_oop, \
2016 assert_fn) \
2017 { \
2018 T* p = (T*)(start_p); \
2019 T* const end = p + (count); \
2020 while (p < end) { \
2021 (assert_fn)(p); \
2022 do_oop; \
2023 ++p; \
2024 } \
2025 }
2026
2027 #define InstanceKlass_SPECIALIZED_OOP_REVERSE_ITERATE( \
2028 T, start_p, count, do_oop, \
2029 assert_fn) \
2030 { \
2031 T* const start = (T*)(start_p); \
2032 T* p = start + (count); \
2033 while (start < p) { \
2034 --p; \
2035 (assert_fn)(p); \
2036 do_oop; \
2037 } \
2038 }
2039
2040 #define InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE( \
2041 T, start_p, count, low, high, \
2042 do_oop, assert_fn) \
2043 { \
2044 T* const l = (T*)(low); \
2045 T* const h = (T*)(high); \
2046 assert(mask_bits((intptr_t)l, sizeof(T)-1) == 0 && \
2047 mask_bits((intptr_t)h, sizeof(T)-1) == 0, \
2048 "bounded region must be properly aligned"); \
2049 T* p = (T*)(start_p); \
2050 T* end = p + (count); \
2051 if (p < l) p = l; \
2052 if (end > h) end = h; \
2053 while (p < end) { \
2054 (assert_fn)(p); \
2055 do_oop; \
2056 ++p; \
2057 } \
2058 }
2059
2060
2061 // The following macros call specialized macros, passing either oop or
2062 // narrowOop as the specialization type. These test the UseCompressedOops
2063 // flag.
2064 #define InstanceKlass_OOP_MAP_ITERATE(obj, do_oop, assert_fn) \
2065 { \
2066 /* Compute oopmap block range. The common case \
2067 is nonstatic_oop_map_size == 1. */ \
2068 OopMapBlock* map = start_of_nonstatic_oop_maps(); \
2069 OopMapBlock* const end_map = map + nonstatic_oop_map_count(); \
2070 if (UseCompressedOops) { \
2071 while (map < end_map) { \
2072 InstanceKlass_SPECIALIZED_OOP_ITERATE(narrowOop, \
2073 obj->obj_field_addr<narrowOop>(map->offset()), map->count(), \
2074 do_oop, assert_fn) \
2075 ++map; \
2076 } \
2077 } else { \
2078 while (map < end_map) { \
2079 InstanceKlass_SPECIALIZED_OOP_ITERATE(oop, \
2080 obj->obj_field_addr<oop>(map->offset()), map->count(), \
2081 do_oop, assert_fn) \
2082 ++map; \
2083 } \
2084 } \
2085 }
2086
2087 #define InstanceKlass_OOP_MAP_REVERSE_ITERATE(obj, do_oop, assert_fn) \
2088 { \
2089 OopMapBlock* const start_map = start_of_nonstatic_oop_maps(); \
2090 OopMapBlock* map = start_map + nonstatic_oop_map_count(); \
2091 if (UseCompressedOops) { \
2092 while (start_map < map) { \
2093 --map; \
2094 InstanceKlass_SPECIALIZED_OOP_REVERSE_ITERATE(narrowOop, \
2095 obj->obj_field_addr<narrowOop>(map->offset()), map->count(), \
2096 do_oop, assert_fn) \
2097 } \
2098 } else { \
2099 while (start_map < map) { \
2100 --map; \
2101 InstanceKlass_SPECIALIZED_OOP_REVERSE_ITERATE(oop, \
2102 obj->obj_field_addr<oop>(map->offset()), map->count(), \
2103 do_oop, assert_fn) \
2104 } \
2105 } \
2106 }
2107
2108 #define InstanceKlass_BOUNDED_OOP_MAP_ITERATE(obj, low, high, do_oop, \
2109 assert_fn) \
2110 { \
2111 /* Compute oopmap block range. The common case is \
2112 nonstatic_oop_map_size == 1, so we accept the \
2113 usually non-existent extra overhead of examining \
2114 all the maps. */ \
2115 OopMapBlock* map = start_of_nonstatic_oop_maps(); \
2116 OopMapBlock* const end_map = map + nonstatic_oop_map_count(); \
2117 if (UseCompressedOops) { \
2118 while (map < end_map) { \
2119 InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(narrowOop, \
2120 obj->obj_field_addr<narrowOop>(map->offset()), map->count(), \
2121 low, high, \
2122 do_oop, assert_fn) \
2123 ++map; \
2124 } \
2125 } else { \
2126 while (map < end_map) { \
2127 InstanceKlass_SPECIALIZED_BOUNDED_OOP_ITERATE(oop, \
2128 obj->obj_field_addr<oop>(map->offset()), map->count(), \
2129 low, high, \
2130 do_oop, assert_fn) \
2131 ++map; \
2132 } \
2133 } \
2134 }
2135
2136 void InstanceKlass::oop_follow_contents(oop obj) {
2137 assert(obj != NULL, "can't follow the content of NULL object");
2138 MarkSweep::follow_klass(obj->klass());
2139 InstanceKlass_OOP_MAP_ITERATE( \
2140 obj, \
2141 MarkSweep::mark_and_push(p), \
2142 assert_is_in_closed_subset)
2143 }
2144
2145 #if INCLUDE_ALL_GCS
2146 void InstanceKlass::oop_follow_contents(ParCompactionManager* cm,
2147 oop obj) {
2148 assert(obj != NULL, "can't follow the content of NULL object");
2149 PSParallelCompact::follow_klass(cm, obj->klass());
2150 // Only mark the header and let the scan of the meta-data mark
2151 // everything else.
2152 InstanceKlass_OOP_MAP_ITERATE( \
2153 obj, \
2154 PSParallelCompact::mark_and_push(cm, p), \
2155 assert_is_in)
2156 }
2157 #endif // INCLUDE_ALL_GCS
2158
2159 // closure's do_metadata() method dictates whether the given closure should be
2160 // applied to the klass ptr in the object header.
2161
2162 #define InstanceKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \
2163 \
2164 int InstanceKlass::oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \
2165 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::ik);\
2166 /* header */ \
2167 if_do_metadata_checked(closure, nv_suffix) { \
2168 closure->do_klass##nv_suffix(obj->klass()); \
2169 } \
2170 InstanceKlass_OOP_MAP_ITERATE( \
2171 obj, \
2172 SpecializationStats:: \
2173 record_do_oop_call##nv_suffix(SpecializationStats::ik); \
2174 (closure)->do_oop##nv_suffix(p), \
2175 assert_is_in_closed_subset) \
2176 return size_helper(); \
2177 }
2178
2179 #if INCLUDE_ALL_GCS
2180 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \
2181 \
2182 int InstanceKlass::oop_oop_iterate_backwards##nv_suffix(oop obj, \
2183 OopClosureType* closure) { \
2184 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::ik); \
2185 \
2186 assert_should_ignore_metadata(closure, nv_suffix); \
2187 \
2188 /* instance variables */ \
2189 InstanceKlass_OOP_MAP_REVERSE_ITERATE( \
2190 obj, \
2191 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::ik);\
2192 (closure)->do_oop##nv_suffix(p), \
2193 assert_is_in_closed_subset) \
2194 return size_helper(); \
2195 }
2196 #endif // INCLUDE_ALL_GCS
2197
2198 #define InstanceKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \
2199 \
2200 int InstanceKlass::oop_oop_iterate##nv_suffix##_m(oop obj, \
2201 OopClosureType* closure, \
2202 MemRegion mr) { \
2203 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::ik);\
2204 if_do_metadata_checked(closure, nv_suffix) { \
2205 if (mr.contains(obj)) { \
2206 closure->do_klass##nv_suffix(obj->klass()); \
2207 } \
2208 } \
2209 InstanceKlass_BOUNDED_OOP_MAP_ITERATE( \
2210 obj, mr.start(), mr.end(), \
2211 (closure)->do_oop##nv_suffix(p), \
2212 assert_is_in_closed_subset) \
2213 return size_helper(); \
2214 }
2215
2216 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DEFN)
2217 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DEFN)
2218 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DEFN_m)
2219 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DEFN_m)
2220 #if INCLUDE_ALL_GCS
2221 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
2222 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
2223 #endif // INCLUDE_ALL_GCS
2224
2225 int InstanceKlass::oop_adjust_pointers(oop obj) {
2226 int size = size_helper();
2227 InstanceKlass_OOP_MAP_ITERATE( \
2228 obj, \
2229 MarkSweep::adjust_pointer(p), \
2230 assert_is_in)
2231 return size;
2232 }
2233
2234 #if INCLUDE_ALL_GCS
2235 void InstanceKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
2236 InstanceKlass_OOP_MAP_REVERSE_ITERATE( \
2237 obj, \
2238 if (PSScavenge::should_scavenge(p)) { \
2239 pm->claim_or_forward_depth(p); \
2240 }, \
2241 assert_nothing )
2242 }
2243
2244 int InstanceKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
2245 int size = size_helper();
2246 InstanceKlass_OOP_MAP_ITERATE( \
2247 obj, \
2248 PSParallelCompact::adjust_pointer(p), \
2249 assert_is_in)
2250 return size;
2251 }
2252
2253 #endif // INCLUDE_ALL_GCS
2254
2255 void InstanceKlass::clean_implementors_list(BoolObjectClosure* is_alive) {
2256 assert(class_loader_data()->is_alive(is_alive), "this klass should be live");
2257 if (is_interface()) {
2258 if (ClassUnloading) {
2259 Klass* impl = implementor();
2260 if (impl != NULL) {
2261 if (!impl->is_loader_alive(is_alive)) {
2262 // remove this guy
2263 Klass** klass = adr_implementor();
2264 assert(klass != NULL, "null klass");
2265 if (klass != NULL) {
2266 *klass = NULL;
2267 }
2268 }
2269 }
2270 }
2271 }
2272 }
2273
2274 void InstanceKlass::clean_method_data(BoolObjectClosure* is_alive) {
2275 for (int m = 0; m < methods()->length(); m++) {
2276 MethodData* mdo = methods()->at(m)->method_data();
2277 if (mdo != NULL) {
2278 mdo->clean_method_data(is_alive);
2279 }
2280 }
2281 }
2282
2283
2284 static void remove_unshareable_in_class(Klass* k) {
2285 // remove klass's unshareable info
2286 k->remove_unshareable_info();
2287 }
2288
2289 void InstanceKlass::remove_unshareable_info() {
2290 Klass::remove_unshareable_info();
2291 // Unlink the class
2292 if (is_linked()) {
2293 unlink_class();
2294 }
2295 init_implementor();
2296
2297 constants()->remove_unshareable_info();
2298
2299 for (int i = 0; i < methods()->length(); i++) {
2300 Method* m = methods()->at(i);
2301 m->remove_unshareable_info();
2302 }
2303
2304 // do array classes also.
2305 array_klasses_do(remove_unshareable_in_class);
2306 }
2307
2308 static void restore_unshareable_in_class(Klass* k, TRAPS) {
2309 // Array classes have null protection domain.
2310 // --> see ArrayKlass::complete_create_array_klass()
2311 k->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
2312 }
2313
2314 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) {
2315 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
2316 instanceKlassHandle ik(THREAD, this);
2317
2318 Array<Method*>* methods = ik->methods();
2319 int num_methods = methods->length();
2320 for (int index2 = 0; index2 < num_methods; ++index2) {
2321 methodHandle m(THREAD, methods->at(index2));
2322 m->restore_unshareable_info(CHECK);
2323 }
2324 if (JvmtiExport::has_redefined_a_class()) {
2325 // Reinitialize vtable because RedefineClasses may have changed some
2326 // entries in this vtable for super classes so the CDS vtable might
2327 // point to old or obsolete entries. RedefineClasses doesn't fix up
2328 // vtables in the shared system dictionary, only the main one.
2329 // It also redefines the itable too so fix that too.
2330 ResourceMark rm(THREAD);
2331 ik->vtable()->initialize_vtable(false, CHECK);
2332 ik->itable()->initialize_itable(false, CHECK);
2333 }
2334
2335 // restore constant pool resolved references
2336 ik->constants()->restore_unshareable_info(CHECK);
2337
2338 ik->array_klasses_do(restore_unshareable_in_class, CHECK);
2339 }
2340
2341 // returns true IFF is_in_error_state() has been changed as a result of this call.
2342 bool InstanceKlass::check_sharing_error_state() {
2343 assert(DumpSharedSpaces, "should only be called during dumping");
2344 bool old_state = is_in_error_state();
2345
2346 if (!is_in_error_state()) {
2347 bool bad = false;
2348 for (InstanceKlass* sup = java_super(); sup; sup = sup->java_super()) {
2349 if (sup->is_in_error_state()) {
2350 bad = true;
2351 break;
2352 }
2353 }
2354 if (!bad) {
2355 Array<Klass*>* interfaces = transitive_interfaces();
2356 for (int i = 0; i < interfaces->length(); i++) {
2357 Klass* iface = interfaces->at(i);
2358 if (InstanceKlass::cast(iface)->is_in_error_state()) {
2359 bad = true;
2360 break;
2361 }
2362 }
2363 }
2364
2365 if (bad) {
2366 set_in_error_state();
2367 }
2368 }
2369
2370 return (old_state != is_in_error_state());
2371 }
2372
2373 static void clear_all_breakpoints(Method* m) {
2374 m->clear_all_breakpoints();
2375 }
2376
2377
2378 void InstanceKlass::notify_unload_class(InstanceKlass* ik) {
2379 // notify the debugger
2380 if (JvmtiExport::should_post_class_unload()) {
2381 JvmtiExport::post_class_unload(ik);
2382 }
2383
2384 // notify ClassLoadingService of class unload
2385 ClassLoadingService::notify_class_unloaded(ik);
2386 }
2387
2388 void InstanceKlass::release_C_heap_structures(InstanceKlass* ik) {
2389 // Clean up C heap
2390 ik->release_C_heap_structures();
2391 ik->constants()->release_C_heap_structures();
2392 }
2393
2394 void InstanceKlass::release_C_heap_structures() {
2395
2396 // Can't release the constant pool here because the constant pool can be
2397 // deallocated separately from the InstanceKlass for default methods and
2398 // redefine classes.
2399
2400 // Deallocate oop map cache
2401 if (_oop_map_cache != NULL) {
2402 delete _oop_map_cache;
2403 _oop_map_cache = NULL;
2404 }
2405
2406 // Deallocate JNI identifiers for jfieldIDs
2407 JNIid::deallocate(jni_ids());
2408 set_jni_ids(NULL);
2409
2410 jmethodID* jmeths = methods_jmethod_ids_acquire();
2411 if (jmeths != (jmethodID*)NULL) {
2412 release_set_methods_jmethod_ids(NULL);
2413 FreeHeap(jmeths);
2414 }
2415
2416 // release dependencies
2417 nmethodBucket* b = _dependencies;
2418 _dependencies = NULL;
2419 while (b != NULL) {
2420 nmethodBucket* next = b->next();
2421 delete b;
2422 b = next;
2423 }
2424
2425 // Deallocate breakpoint records
2426 if (breakpoints() != 0x0) {
2427 methods_do(clear_all_breakpoints);
2428 assert(breakpoints() == 0x0, "should have cleared breakpoints");
2429 }
2430
2431 // deallocate the cached class file
2432 if (_cached_class_file != NULL) {
2433 os::free(_cached_class_file, mtClass);
2434 _cached_class_file = NULL;
2435 }
2436
2437 // Decrement symbol reference counts associated with the unloaded class.
2438 if (_name != NULL) _name->decrement_refcount();
2439 // unreference array name derived from this class name (arrays of an unloaded
2440 // class can't be referenced anymore).
2441 if (_array_name != NULL) _array_name->decrement_refcount();
2442 if (_source_debug_extension != NULL) FREE_C_HEAP_ARRAY(char, _source_debug_extension, mtClass);
2443
2444 assert(_total_instanceKlass_count >= 1, "Sanity check");
2445 Atomic::dec(&_total_instanceKlass_count);
2446 }
2447
2448 void InstanceKlass::set_source_debug_extension(char* array, int length) {
2449 if (array == NULL) {
2450 _source_debug_extension = NULL;
2451 } else {
2452 // Adding one to the attribute length in order to store a null terminator
2453 // character could cause an overflow because the attribute length is
2454 // already coded with an u4 in the classfile, but in practice, it's
2455 // unlikely to happen.
2456 assert((length+1) > length, "Overflow checking");
2457 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
2458 for (int i = 0; i < length; i++) {
2459 sde[i] = array[i];
2460 }
2461 sde[length] = '\0';
2462 _source_debug_extension = sde;
2463 }
2464 }
2465
2466 address InstanceKlass::static_field_addr(int offset) {
2467 return (address)(offset + InstanceMirrorKlass::offset_of_static_fields() + cast_from_oop<intptr_t>(java_mirror()));
2468 }
2469
2470
2471 const char* InstanceKlass::signature_name() const {
2472 int hash_len = 0;
2473 char hash_buf[40];
2474
2475 // If this is an anonymous class, append a hash to make the name unique
2476 if (is_anonymous()) {
2477 intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0;
2478 sprintf(hash_buf, "/" UINTX_FORMAT, (uintx)hash);
2479 hash_len = (int)strlen(hash_buf);
2480 }
2481
2482 // Get the internal name as a c string
2483 const char* src = (const char*) (name()->as_C_string());
2484 const int src_length = (int)strlen(src);
2485
2486 char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3);
2487
2488 // Add L as type indicator
2489 int dest_index = 0;
2490 dest[dest_index++] = 'L';
2491
2492 // Add the actual class name
2493 for (int src_index = 0; src_index < src_length; ) {
2494 dest[dest_index++] = src[src_index++];
2495 }
2496
2497 // If we have a hash, append it
2498 for (int hash_index = 0; hash_index < hash_len; ) {
2499 dest[dest_index++] = hash_buf[hash_index++];
2500 }
2501
2502 // Add the semicolon and the NULL
2503 dest[dest_index++] = ';';
2504 dest[dest_index] = '\0';
2505 return dest;
2506 }
2507
2508 // different verisons of is_same_class_package
2509 bool InstanceKlass::is_same_class_package(Klass* class2) {
2510 Klass* class1 = this;
2511 oop classloader1 = InstanceKlass::cast(class1)->class_loader();
2512 Symbol* classname1 = class1->name();
2513
2514 if (class2->oop_is_objArray()) {
2515 class2 = ObjArrayKlass::cast(class2)->bottom_klass();
2516 }
2517 oop classloader2;
2518 if (class2->oop_is_instance()) {
2519 classloader2 = InstanceKlass::cast(class2)->class_loader();
2520 } else {
2521 assert(class2->oop_is_typeArray(), "should be type array");
2522 classloader2 = NULL;
2523 }
2524 Symbol* classname2 = class2->name();
2525
2526 return InstanceKlass::is_same_class_package(classloader1, classname1,
2527 classloader2, classname2);
2528 }
2529
2530 bool InstanceKlass::is_same_class_package(oop classloader2, Symbol* classname2) {
2531 Klass* class1 = this;
2532 oop classloader1 = InstanceKlass::cast(class1)->class_loader();
2533 Symbol* classname1 = class1->name();
2534
2535 return InstanceKlass::is_same_class_package(classloader1, classname1,
2536 classloader2, classname2);
2537 }
2538
2539 // return true if two classes are in the same package, classloader
2540 // and classname information is enough to determine a class's package
2541 bool InstanceKlass::is_same_class_package(oop class_loader1, Symbol* class_name1,
2542 oop class_loader2, Symbol* class_name2) {
2543 if (class_loader1 != class_loader2) {
2544 return false;
2545 } else if (class_name1 == class_name2) {
2546 return true; // skip painful bytewise comparison
2547 } else {
2548 ResourceMark rm;
2549
2550 // The Symbol*'s are in UTF8 encoding. Since we only need to check explicitly
2551 // for ASCII characters ('/', 'L', '['), we can keep them in UTF8 encoding.
2552 // Otherwise, we just compare jbyte values between the strings.
2553 const jbyte *name1 = class_name1->base();
2554 const jbyte *name2 = class_name2->base();
2555
2556 const jbyte *last_slash1 = UTF8::strrchr(name1, class_name1->utf8_length(), '/');
2557 const jbyte *last_slash2 = UTF8::strrchr(name2, class_name2->utf8_length(), '/');
2558
2559 if ((last_slash1 == NULL) || (last_slash2 == NULL)) {
2560 // One of the two doesn't have a package. Only return true
2561 // if the other one also doesn't have a package.
2562 return last_slash1 == last_slash2;
2563 } else {
2564 // Skip over '['s
2565 if (*name1 == '[') {
2566 do {
2567 name1++;
2568 } while (*name1 == '[');
2569 if (*name1 != 'L') {
2570 // Something is terribly wrong. Shouldn't be here.
2571 return false;
2572 }
2573 }
2574 if (*name2 == '[') {
2575 do {
2576 name2++;
2577 } while (*name2 == '[');
2578 if (*name2 != 'L') {
2579 // Something is terribly wrong. Shouldn't be here.
2580 return false;
2581 }
2582 }
2583
2584 // Check that package part is identical
2585 int length1 = last_slash1 - name1;
2586 int length2 = last_slash2 - name2;
2587
2588 return UTF8::equal(name1, length1, name2, length2);
2589 }
2590 }
2591 }
2592
2593 // Returns true iff super_method can be overridden by a method in targetclassname
2594 // See JSL 3rd edition 8.4.6.1
2595 // Assumes name-signature match
2596 // "this" is InstanceKlass of super_method which must exist
2597 // note that the InstanceKlass of the method in the targetclassname has not always been created yet
2598 bool InstanceKlass::is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) {
2599 // Private methods can not be overridden
2600 if (super_method->is_private()) {
2601 return false;
2602 }
2603 // If super method is accessible, then override
2604 if ((super_method->is_protected()) ||
2605 (super_method->is_public())) {
2606 return true;
2607 }
2608 // Package-private methods are not inherited outside of package
2609 assert(super_method->is_package_private(), "must be package private");
2610 return(is_same_class_package(targetclassloader(), targetclassname));
2611 }
2612
2613 /* defined for now in jvm.cpp, for historical reasons *--
2614 Klass* InstanceKlass::compute_enclosing_class_impl(instanceKlassHandle self,
2615 Symbol*& simple_name_result, TRAPS) {
2616 ...
2617 }
2618 */
2619
2620 // tell if two classes have the same enclosing class (at package level)
2621 bool InstanceKlass::is_same_package_member_impl(instanceKlassHandle class1,
2622 Klass* class2_oop, TRAPS) {
2623 if (class2_oop == class1()) return true;
2624 if (!class2_oop->oop_is_instance()) return false;
2625 instanceKlassHandle class2(THREAD, class2_oop);
2626
2627 // must be in same package before we try anything else
2628 if (!class1->is_same_class_package(class2->class_loader(), class2->name()))
2629 return false;
2630
2631 // As long as there is an outer1.getEnclosingClass,
2632 // shift the search outward.
2633 instanceKlassHandle outer1 = class1;
2634 for (;;) {
2635 // As we walk along, look for equalities between outer1 and class2.
2636 // Eventually, the walks will terminate as outer1 stops
2637 // at the top-level class around the original class.
2638 bool ignore_inner_is_member;
2639 Klass* next = outer1->compute_enclosing_class(&ignore_inner_is_member,
2640 CHECK_false);
2641 if (next == NULL) break;
2642 if (next == class2()) return true;
2643 outer1 = instanceKlassHandle(THREAD, next);
2644 }
2645
2646 // Now do the same for class2.
2647 instanceKlassHandle outer2 = class2;
2648 for (;;) {
2649 bool ignore_inner_is_member;
2650 Klass* next = outer2->compute_enclosing_class(&ignore_inner_is_member,
2651 CHECK_false);
2652 if (next == NULL) break;
2653 // Might as well check the new outer against all available values.
2654 if (next == class1()) return true;
2655 if (next == outer1()) return true;
2656 outer2 = instanceKlassHandle(THREAD, next);
2657 }
2658
2659 // If by this point we have not found an equality between the
2660 // two classes, we know they are in separate package members.
2661 return false;
2662 }
2663
2664
2665 jint InstanceKlass::compute_modifier_flags(TRAPS) const {
2666 jint access = access_flags().as_int();
2667
2668 // But check if it happens to be member class.
2669 instanceKlassHandle ik(THREAD, this);
2670 InnerClassesIterator iter(ik);
2671 for (; !iter.done(); iter.next()) {
2672 int ioff = iter.inner_class_info_index();
2673 // Inner class attribute can be zero, skip it.
2674 // Strange but true: JVM spec. allows null inner class refs.
2675 if (ioff == 0) continue;
2676
2677 // only look at classes that are already loaded
2678 // since we are looking for the flags for our self.
2679 Symbol* inner_name = ik->constants()->klass_name_at(ioff);
2680 if ((ik->name() == inner_name)) {
2681 // This is really a member class.
2682 access = iter.inner_access_flags();
2683 break;
2684 }
2685 }
2686 // Remember to strip ACC_SUPER bit
2687 return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS;
2688 }
2689
2690 jint InstanceKlass::jvmti_class_status() const {
2691 jint result = 0;
2692
2693 if (is_linked()) {
2694 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
2695 }
2696
2697 if (is_initialized()) {
2698 assert(is_linked(), "Class status is not consistent");
2699 result |= JVMTI_CLASS_STATUS_INITIALIZED;
2700 }
2701 if (is_in_error_state()) {
2702 result |= JVMTI_CLASS_STATUS_ERROR;
2703 }
2704 return result;
2705 }
2706
2707 Method* InstanceKlass::method_at_itable(Klass* holder, int index, TRAPS) {
2708 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2709 int method_table_offset_in_words = ioe->offset()/wordSize;
2710 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
2711 / itableOffsetEntry::size();
2712
2713 for (int cnt = 0 ; ; cnt ++, ioe ++) {
2714 // If the interface isn't implemented by the receiver class,
2715 // the VM should throw IncompatibleClassChangeError.
2716 if (cnt >= nof_interfaces) {
2717 THROW_NULL(vmSymbols::java_lang_IncompatibleClassChangeError());
2718 }
2719
2720 Klass* ik = ioe->interface_klass();
2721 if (ik == holder) break;
2722 }
2723
2724 itableMethodEntry* ime = ioe->first_method_entry(this);
2725 Method* m = ime[index].method();
2726 if (m == NULL) {
2727 THROW_NULL(vmSymbols::java_lang_AbstractMethodError());
2728 }
2729 return m;
2730 }
2731
2732
2733 #if INCLUDE_JVMTI
2734 // update default_methods for redefineclasses for methods that are
2735 // not yet in the vtable due to concurrent subclass define and superinterface
2736 // redefinition
2737 // Note: those in the vtable, should have been updated via adjust_method_entries
2738 void InstanceKlass::adjust_default_methods(Method** old_methods, Method** new_methods,
2739 int methods_length, bool* trace_name_printed) {
2740 // search the default_methods for uses of either obsolete or EMCP methods
2741 if (default_methods() != NULL) {
2742 for (int j = 0; j < methods_length; j++) {
2743 Method* old_method = old_methods[j];
2744 Method* new_method = new_methods[j];
2745
2746 for (int index = 0; index < default_methods()->length(); index ++) {
2747 if (default_methods()->at(index) == old_method) {
2748 default_methods()->at_put(index, new_method);
2749 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
2750 if (!(*trace_name_printed)) {
2751 // RC_TRACE_MESG macro has an embedded ResourceMark
2752 RC_TRACE_MESG(("adjust: klassname=%s default methods from name=%s",
2753 external_name(),
2754 old_method->method_holder()->external_name()));
2755 *trace_name_printed = true;
2756 }
2757 RC_TRACE(0x00100000, ("default method update: %s(%s) ",
2758 new_method->name()->as_C_string(),
2759 new_method->signature()->as_C_string()));
2760 }
2761 }
2762 }
2763 }
2764 }
2765 }
2766
2767 static void adjust_member_name_by_method(objArrayOop array, int size, bool *trace_name_printed,
2768 Method* old_method, Method* new_method) {
2769 // A method may appear once or twice in the member name table with different
2770 // ReferenceKind, so continue looking after the first one is find. Concurrent
2771 // updates on the Java side may also temporarily duplicate array elements.
2772 for (int i = 0; i < size; i++) {
2773 oop member_name = array->obj_at(i);
2774 assert(member_name != NULL, "");
2775 Method* method = (Method*) java_lang_invoke_MemberName::vmtarget(member_name);
2776 if (method == old_method) {
2777 java_lang_invoke_MemberName::adjust_vmtarget(member_name, new_method);
2778
2779 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
2780 if (!(*trace_name_printed)) {
2781 // RC_TRACE_MESG macro has an embedded ResourceMark
2782 RC_TRACE_MESG(("adjust: name=%s",
2783 old_method->method_holder()->external_name()));
2784 *trace_name_printed = true;
2785 }
2786 // RC_TRACE macro has an embedded ResourceMark
2787 RC_TRACE(0x00400000, ("MemberName method update: %s(%s)",
2788 new_method->name()->as_C_string(),
2789 new_method->signature()->as_C_string()));
2790 }
2791 }
2792 }
2793 }
2794
2795 /**
2796 * Adjust the java.lang.invoke.MemberName entries in the member name table in
2797 * java.lang.Class$ClassData.memberNameTable.
2798 *
2799 * NOTE: This is called at a safepoint only!
2800 */
2801 void InstanceKlass::adjust_member_name_table(Method** old_methods, Method** new_methods,
2802 int methods_length, bool *trace_name_printed) {
2803 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
2804
2805 // Dig out the member name table array.
2806 oop class_data = java_lang_Class::classData(java_mirror());
2807 if (class_data == NULL)
2808 return; // was never initialized
2809 objArrayOop array = java_lang_Class_ClassData::elementData(class_data);
2810 int size = java_lang_Class_ClassData::size(class_data);
2811
2812 // Search the MemberNameTable for uses of either obsolete or EMCP methods.
2813 for (int i = 0; i < methods_length; i++) {
2814 Method* old_method = old_methods[i];
2815 Method* new_method = new_methods[i];
2816 adjust_member_name_by_method(array, size, trace_name_printed, old_method, new_method);
2817 }
2818 }
2819 #endif // INCLUDE_JVMTI
2820
2821 // On-stack replacement stuff
2822 void InstanceKlass::add_osr_nmethod(nmethod* n) {
2823 // only one compilation can be active
2824 NEEDS_CLEANUP
2825 // This is a short non-blocking critical region, so the no safepoint check is ok.
2826 OsrList_lock->lock_without_safepoint_check();
2827 assert(n->is_osr_method(), "wrong kind of nmethod");
2828 n->set_osr_link(osr_nmethods_head());
2829 set_osr_nmethods_head(n);
2830 // Raise the highest osr level if necessary
2831 if (TieredCompilation) {
2832 Method* m = n->method();
2833 m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level()));
2834 }
2835 // Remember to unlock again
2836 OsrList_lock->unlock();
2837
2838 // Get rid of the osr methods for the same bci that have lower levels.
2839 if (TieredCompilation) {
2840 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) {
2841 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true);
2842 if (inv != NULL && inv->is_in_use()) {
2843 inv->make_not_entrant();
2844 }
2845 }
2846 }
2847 }
2848
2849
2850 void InstanceKlass::remove_osr_nmethod(nmethod* n) {
2851 // This is a short non-blocking critical region, so the no safepoint check is ok.
2852 OsrList_lock->lock_without_safepoint_check();
2853 assert(n->is_osr_method(), "wrong kind of nmethod");
2854 nmethod* last = NULL;
2855 nmethod* cur = osr_nmethods_head();
2856 int max_level = CompLevel_none; // Find the max comp level excluding n
2857 Method* m = n->method();
2858 // Search for match
2859 while(cur != NULL && cur != n) {
2860 if (TieredCompilation && m == cur->method()) {
2861 // Find max level before n
2862 max_level = MAX2(max_level, cur->comp_level());
2863 }
2864 last = cur;
2865 cur = cur->osr_link();
2866 }
2867 nmethod* next = NULL;
2868 if (cur == n) {
2869 next = cur->osr_link();
2870 if (last == NULL) {
2871 // Remove first element
2872 set_osr_nmethods_head(next);
2873 } else {
2874 last->set_osr_link(next);
2875 }
2876 }
2877 n->set_osr_link(NULL);
2878 if (TieredCompilation) {
2879 cur = next;
2880 while (cur != NULL) {
2881 // Find max level after n
2882 if (m == cur->method()) {
2883 max_level = MAX2(max_level, cur->comp_level());
2884 }
2885 cur = cur->osr_link();
2886 }
2887 m->set_highest_osr_comp_level(max_level);
2888 }
2889 // Remember to unlock again
2890 OsrList_lock->unlock();
2891 }
2892
2893 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
2894 // This is a short non-blocking critical region, so the no safepoint check is ok.
2895 OsrList_lock->lock_without_safepoint_check();
2896 nmethod* osr = osr_nmethods_head();
2897 nmethod* best = NULL;
2898 while (osr != NULL) {
2899 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
2900 // There can be a time when a c1 osr method exists but we are waiting
2901 // for a c2 version. When c2 completes its osr nmethod we will trash
2902 // the c1 version and only be able to find the c2 version. However
2903 // while we overflow in the c1 code at back branches we don't want to
2904 // try and switch to the same code as we are already running
2905
2906 if (osr->method() == m &&
2907 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
2908 if (match_level) {
2909 if (osr->comp_level() == comp_level) {
2910 // Found a match - return it.
2911 OsrList_lock->unlock();
2912 return osr;
2913 }
2914 } else {
2915 if (best == NULL || (osr->comp_level() > best->comp_level())) {
2916 if (osr->comp_level() == CompLevel_highest_tier) {
2917 // Found the best possible - return it.
2918 OsrList_lock->unlock();
2919 return osr;
2920 }
2921 best = osr;
2922 }
2923 }
2924 }
2925 osr = osr->osr_link();
2926 }
2927 OsrList_lock->unlock();
2928 if (best != NULL && best->comp_level() >= comp_level && match_level == false) {
2929 return best;
2930 }
2931 return NULL;
2932 }
2933
2934 // -----------------------------------------------------------------------------------------------------
2935 // Printing
2936
2937 #ifndef PRODUCT
2938
2939 #define BULLET " - "
2940
2941 static const char* state_names[] = {
2942 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
2943 };
2944
2945 static void print_vtable(intptr_t* start, int len, outputStream* st) {
2946 for (int i = 0; i < len; i++) {
2947 intptr_t e = start[i];
2948 st->print("%d : " INTPTR_FORMAT, i, e);
2949 if (e != 0 && ((Metadata*)e)->is_metaspace_object()) {
2950 st->print(" ");
2951 ((Metadata*)e)->print_value_on(st);
2952 }
2953 st->cr();
2954 }
2955 }
2956
2957 void InstanceKlass::print_on(outputStream* st) const {
2958 assert(is_klass(), "must be klass");
2959 Klass::print_on(st);
2960
2961 st->print(BULLET"instance size: %d", size_helper()); st->cr();
2962 st->print(BULLET"klass size: %d", size()); st->cr();
2963 st->print(BULLET"access: "); access_flags().print_on(st); st->cr();
2964 st->print(BULLET"state: "); st->print_cr("%s", state_names[_init_state]);
2965 st->print(BULLET"name: "); name()->print_value_on(st); st->cr();
2966 st->print(BULLET"super: "); super()->print_value_on_maybe_null(st); st->cr();
2967 st->print(BULLET"sub: ");
2968 Klass* sub = subklass();
2969 int n;
2970 for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) {
2971 if (n < MaxSubklassPrintSize) {
2972 sub->print_value_on(st);
2973 st->print(" ");
2974 }
2975 }
2976 if (n >= MaxSubklassPrintSize) st->print("(%d more klasses...)", n - MaxSubklassPrintSize);
2977 st->cr();
2978
2979 if (is_interface()) {
2980 st->print_cr(BULLET"nof implementors: %d", nof_implementors());
2981 if (nof_implementors() == 1) {
2982 st->print_cr(BULLET"implementor: ");
2983 st->print(" ");
2984 implementor()->print_value_on(st);
2985 st->cr();
2986 }
2987 }
2988
2989 st->print(BULLET"arrays: "); array_klasses()->print_value_on_maybe_null(st); st->cr();
2990 st->print(BULLET"methods: "); methods()->print_value_on(st); st->cr();
2991 if (Verbose || WizardMode) {
2992 Array<Method*>* method_array = methods();
2993 for (int i = 0; i < method_array->length(); i++) {
2994 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
2995 }
2996 }
2997 st->print(BULLET"method ordering: "); method_ordering()->print_value_on(st); st->cr();
2998 st->print(BULLET"default_methods: "); default_methods()->print_value_on(st); st->cr();
2999 if (Verbose && default_methods() != NULL) {
3000 Array<Method*>* method_array = default_methods();
3001 for (int i = 0; i < method_array->length(); i++) {
3002 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3003 }
3004 }
3005 if (default_vtable_indices() != NULL) {
3006 st->print(BULLET"default vtable indices: "); default_vtable_indices()->print_value_on(st); st->cr();
3007 }
3008 st->print(BULLET"local interfaces: "); local_interfaces()->print_value_on(st); st->cr();
3009 st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr();
3010 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr();
3011 if (class_loader_data() != NULL) {
3012 st->print(BULLET"class loader data: ");
3013 class_loader_data()->print_value_on(st);
3014 st->cr();
3015 }
3016 st->print(BULLET"host class: "); host_klass()->print_value_on_maybe_null(st); st->cr();
3017 if (source_file_name() != NULL) {
3018 st->print(BULLET"source file: ");
3019 source_file_name()->print_value_on(st);
3020 st->cr();
3021 }
3022 if (source_debug_extension() != NULL) {
3023 st->print(BULLET"source debug extension: ");
3024 st->print("%s", source_debug_extension());
3025 st->cr();
3026 }
3027 st->print(BULLET"class annotations: "); class_annotations()->print_value_on(st); st->cr();
3028 st->print(BULLET"class type annotations: "); class_type_annotations()->print_value_on(st); st->cr();
3029 st->print(BULLET"field annotations: "); fields_annotations()->print_value_on(st); st->cr();
3030 st->print(BULLET"field type annotations: "); fields_type_annotations()->print_value_on(st); st->cr();
3031 {
3032 bool have_pv = false;
3033 // previous versions are linked together through the InstanceKlass
3034 for (InstanceKlass* pv_node = _previous_versions;
3035 pv_node != NULL;
3036 pv_node = pv_node->previous_versions()) {
3037 if (!have_pv)
3038 st->print(BULLET"previous version: ");
3039 have_pv = true;
3040 pv_node->constants()->print_value_on(st);
3041 }
3042 if (have_pv) st->cr();
3043 }
3044
3045 if (generic_signature() != NULL) {
3046 st->print(BULLET"generic signature: ");
3047 generic_signature()->print_value_on(st);
3048 st->cr();
3049 }
3050 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr();
3051 st->print(BULLET"java mirror: "); java_mirror()->print_value_on(st); st->cr();
3052 st->print(BULLET"vtable length %d (start addr: " INTPTR_FORMAT ")", vtable_length(), start_of_vtable()); st->cr();
3053 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st);
3054 st->print(BULLET"itable length %d (start addr: " INTPTR_FORMAT ")", itable_length(), start_of_itable()); st->cr();
3055 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_itable(), itable_length(), st);
3056 st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
3057 FieldPrinter print_static_field(st);
3058 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
3059 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
3060 FieldPrinter print_nonstatic_field(st);
3061 ((InstanceKlass*)this)->do_nonstatic_fields(&print_nonstatic_field);
3062
3063 st->print(BULLET"non-static oop maps: ");
3064 OopMapBlock* map = start_of_nonstatic_oop_maps();
3065 OopMapBlock* end_map = map + nonstatic_oop_map_count();
3066 while (map < end_map) {
3067 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
3068 map++;
3069 }
3070 st->cr();
3071 }
3072
3073 #endif //PRODUCT
3074
3075 void InstanceKlass::print_value_on(outputStream* st) const {
3076 assert(is_klass(), "must be klass");
3077 if (Verbose || WizardMode) access_flags().print_on(st);
3078 name()->print_value_on(st);
3079 }
3080
3081 #ifndef PRODUCT
3082
3083 void FieldPrinter::do_field(fieldDescriptor* fd) {
3084 _st->print(BULLET);
3085 if (_obj == NULL) {
3086 fd->print_on(_st);
3087 _st->cr();
3088 } else {
3089 fd->print_on_for(_st, _obj);
3090 _st->cr();
3091 }
3092 }
3093
3094
3095 void InstanceKlass::oop_print_on(oop obj, outputStream* st) {
3096 Klass::oop_print_on(obj, st);
3097
3098 if (this == SystemDictionary::String_klass()) {
3099 typeArrayOop value = java_lang_String::value(obj);
3100 juint offset = java_lang_String::offset(obj);
3101 juint length = java_lang_String::length(obj);
3102 if (value != NULL &&
3103 value->is_typeArray() &&
3104 offset <= (juint) value->length() &&
3105 offset + length <= (juint) value->length()) {
3106 st->print(BULLET"string: ");
3107 java_lang_String::print(obj, st);
3108 st->cr();
3109 if (!WizardMode) return; // that is enough
3110 }
3111 }
3112
3113 st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj));
3114 FieldPrinter print_field(st, obj);
3115 do_nonstatic_fields(&print_field);
3116
3117 if (this == SystemDictionary::Class_klass()) {
3118 st->print(BULLET"signature: ");
3119 java_lang_Class::print_signature(obj, st);
3120 st->cr();
3121 Klass* mirrored_klass = java_lang_Class::as_Klass(obj);
3122 st->print(BULLET"fake entry for mirror: ");
3123 mirrored_klass->print_value_on_maybe_null(st);
3124 st->cr();
3125 Klass* array_klass = java_lang_Class::array_klass(obj);
3126 st->print(BULLET"fake entry for array: ");
3127 array_klass->print_value_on_maybe_null(st);
3128 st->cr();
3129 st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj));
3130 st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj));
3131 Klass* real_klass = java_lang_Class::as_Klass(obj);
3132 if (real_klass != NULL && real_klass->oop_is_instance()) {
3133 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
3134 }
3135 } else if (this == SystemDictionary::MethodType_klass()) {
3136 st->print(BULLET"signature: ");
3137 java_lang_invoke_MethodType::print_signature(obj, st);
3138 st->cr();
3139 }
3140 }
3141
3142 #endif //PRODUCT
3143
3144 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
3145 st->print("a ");
3146 name()->print_value_on(st);
3147 obj->print_address_on(st);
3148 if (this == SystemDictionary::String_klass()
3149 && java_lang_String::value(obj) != NULL) {
3150 ResourceMark rm;
3151 int len = java_lang_String::length(obj);
3152 int plen = (len < 24 ? len : 12);
3153 char* str = java_lang_String::as_utf8_string(obj, 0, plen);
3154 st->print(" = \"%s\"", str);
3155 if (len > plen)
3156 st->print("...[%d]", len);
3157 } else if (this == SystemDictionary::Class_klass()) {
3158 Klass* k = java_lang_Class::as_Klass(obj);
3159 st->print(" = ");
3160 if (k != NULL) {
3161 k->print_value_on(st);
3162 } else {
3163 const char* tname = type2name(java_lang_Class::primitive_type(obj));
3164 st->print("%s", tname ? tname : "type?");
3165 }
3166 } else if (this == SystemDictionary::MethodType_klass()) {
3167 st->print(" = ");
3168 java_lang_invoke_MethodType::print_signature(obj, st);
3169 } else if (java_lang_boxing_object::is_instance(obj)) {
3170 st->print(" = ");
3171 java_lang_boxing_object::print(obj, st);
3172 } else if (this == SystemDictionary::LambdaForm_klass()) {
3173 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
3174 if (vmentry != NULL) {
3175 st->print(" => ");
3176 vmentry->print_value_on(st);
3177 }
3178 } else if (this == SystemDictionary::MemberName_klass()) {
3179 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
3180 if (vmtarget != NULL) {
3181 st->print(" = ");
3182 vmtarget->print_value_on(st);
3183 } else {
3184 java_lang_invoke_MemberName::clazz(obj)->print_value_on(st);
3185 st->print(".");
3186 java_lang_invoke_MemberName::name(obj)->print_value_on(st);
3187 }
3188 }
3189 }
3190
3191 const char* InstanceKlass::internal_name() const {
3192 return external_name();
3193 }
3194
3195 #if INCLUDE_SERVICES
3196 // Size Statistics
3197 void InstanceKlass::collect_statistics(KlassSizeStats *sz) const {
3198 Klass::collect_statistics(sz);
3199
3200 sz->_inst_size = HeapWordSize * size_helper();
3201 sz->_vtab_bytes = HeapWordSize * align_object_offset(vtable_length());
3202 sz->_itab_bytes = HeapWordSize * align_object_offset(itable_length());
3203 sz->_nonstatic_oopmap_bytes = HeapWordSize *
3204 ((is_interface() || is_anonymous()) ?
3205 align_object_offset(nonstatic_oop_map_size()) :
3206 nonstatic_oop_map_size());
3207
3208 int n = 0;
3209 n += (sz->_methods_array_bytes = sz->count_array(methods()));
3210 n += (sz->_method_ordering_bytes = sz->count_array(method_ordering()));
3211 n += (sz->_local_interfaces_bytes = sz->count_array(local_interfaces()));
3212 n += (sz->_transitive_interfaces_bytes = sz->count_array(transitive_interfaces()));
3213 n += (sz->_fields_bytes = sz->count_array(fields()));
3214 n += (sz->_inner_classes_bytes = sz->count_array(inner_classes()));
3215 sz->_ro_bytes += n;
3216
3217 const ConstantPool* cp = constants();
3218 if (cp) {
3219 cp->collect_statistics(sz);
3220 }
3221
3222 const Annotations* anno = annotations();
3223 if (anno) {
3224 anno->collect_statistics(sz);
3225 }
3226
3227 const Array<Method*>* methods_array = methods();
3228 if (methods()) {
3229 for (int i = 0; i < methods_array->length(); i++) {
3230 Method* method = methods_array->at(i);
3231 if (method) {
3232 sz->_method_count ++;
3233 method->collect_statistics(sz);
3234 }
3235 }
3236 }
3237 }
3238 #endif // INCLUDE_SERVICES
3239
3240 // Verification
3241
3242 class VerifyFieldClosure: public OopClosure {
3243 protected:
3244 template <class T> void do_oop_work(T* p) {
3245 oop obj = oopDesc::load_decode_heap_oop(p);
3246 if (!obj->is_oop_or_null()) {
3247 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p, (address)obj);
3248 Universe::print();
3249 guarantee(false, "boom");
3250 }
3251 }
3252 public:
3253 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); }
3254 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
3255 };
3256
3257 void InstanceKlass::verify_on(outputStream* st) {
3258 #ifndef PRODUCT
3259 // Avoid redundant verifies, this really should be in product.
3260 if (_verify_count == Universe::verify_count()) return;
3261 _verify_count = Universe::verify_count();
3262 #endif
3263
3264 // Verify Klass
3265 Klass::verify_on(st);
3266
3267 // Verify that klass is present in ClassLoaderData
3268 guarantee(class_loader_data()->contains_klass(this),
3269 "this class isn't found in class loader data");
3270
3271 // Verify vtables
3272 if (is_linked()) {
3273 ResourceMark rm;
3274 // $$$ This used to be done only for m/s collections. Doing it
3275 // always seemed a valid generalization. (DLD -- 6/00)
3276 vtable()->verify(st);
3277 }
3278
3279 // Verify first subklass
3280 if (subklass() != NULL) {
3281 guarantee(subklass()->is_klass(), "should be klass");
3282 }
3283
3284 // Verify siblings
3285 Klass* super = this->super();
3286 Klass* sib = next_sibling();
3287 if (sib != NULL) {
3288 if (sib == this) {
3289 fatal(err_msg("subclass points to itself " PTR_FORMAT, sib));
3290 }
3291
3292 guarantee(sib->is_klass(), "should be klass");
3293 guarantee(sib->super() == super, "siblings should have same superklass");
3294 }
3295
3296 // Verify implementor fields
3297 Klass* im = implementor();
3298 if (im != NULL) {
3299 guarantee(is_interface(), "only interfaces should have implementor set");
3300 guarantee(im->is_klass(), "should be klass");
3301 guarantee(!im->is_interface() || im == this,
3302 "implementors cannot be interfaces");
3303 }
3304
3305 // Verify local interfaces
3306 if (local_interfaces()) {
3307 Array<Klass*>* local_interfaces = this->local_interfaces();
3308 for (int j = 0; j < local_interfaces->length(); j++) {
3309 Klass* e = local_interfaces->at(j);
3310 guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
3311 }
3312 }
3313
3314 // Verify transitive interfaces
3315 if (transitive_interfaces() != NULL) {
3316 Array<Klass*>* transitive_interfaces = this->transitive_interfaces();
3317 for (int j = 0; j < transitive_interfaces->length(); j++) {
3318 Klass* e = transitive_interfaces->at(j);
3319 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
3320 }
3321 }
3322
3323 // Verify methods
3324 if (methods() != NULL) {
3325 Array<Method*>* methods = this->methods();
3326 for (int j = 0; j < methods->length(); j++) {
3327 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3328 }
3329 for (int j = 0; j < methods->length() - 1; j++) {
3330 Method* m1 = methods->at(j);
3331 Method* m2 = methods->at(j + 1);
3332 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3333 }
3334 }
3335
3336 // Verify method ordering
3337 if (method_ordering() != NULL) {
3338 Array<int>* method_ordering = this->method_ordering();
3339 int length = method_ordering->length();
3340 if (JvmtiExport::can_maintain_original_method_order() ||
3341 ((UseSharedSpaces || DumpSharedSpaces) && length != 0)) {
3342 guarantee(length == methods()->length(), "invalid method ordering length");
3343 jlong sum = 0;
3344 for (int j = 0; j < length; j++) {
3345 int original_index = method_ordering->at(j);
3346 guarantee(original_index >= 0, "invalid method ordering index");
3347 guarantee(original_index < length, "invalid method ordering index");
3348 sum += original_index;
3349 }
3350 // Verify sum of indices 0,1,...,length-1
3351 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
3352 } else {
3353 guarantee(length == 0, "invalid method ordering length");
3354 }
3355 }
3356
3357 // Verify default methods
3358 if (default_methods() != NULL) {
3359 Array<Method*>* methods = this->default_methods();
3360 for (int j = 0; j < methods->length(); j++) {
3361 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3362 }
3363 for (int j = 0; j < methods->length() - 1; j++) {
3364 Method* m1 = methods->at(j);
3365 Method* m2 = methods->at(j + 1);
3366 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3367 }
3368 }
3369
3370 // Verify JNI static field identifiers
3371 if (jni_ids() != NULL) {
3372 jni_ids()->verify(this);
3373 }
3374
3375 // Verify other fields
3376 if (array_klasses() != NULL) {
3377 guarantee(array_klasses()->is_klass(), "should be klass");
3378 }
3379 if (constants() != NULL) {
3380 guarantee(constants()->is_constantPool(), "should be constant pool");
3381 }
3382 const Klass* host = host_klass();
3383 if (host != NULL) {
3384 guarantee(host->is_klass(), "should be klass");
3385 }
3386 }
3387
3388 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
3389 Klass::oop_verify_on(obj, st);
3390 VerifyFieldClosure blk;
3391 obj->oop_iterate_no_header(&blk);
3392 }
3393
3394
3395 // JNIid class for jfieldIDs only
3396 // Note to reviewers:
3397 // These JNI functions are just moved over to column 1 and not changed
3398 // in the compressed oops workspace.
3399 JNIid::JNIid(Klass* holder, int offset, JNIid* next) {
3400 _holder = holder;
3401 _offset = offset;
3402 _next = next;
3403 debug_only(_is_static_field_id = false;)
3404 }
3405
3406
3407 JNIid* JNIid::find(int offset) {
3408 JNIid* current = this;
3409 while (current != NULL) {
3410 if (current->offset() == offset) return current;
3411 current = current->next();
3412 }
3413 return NULL;
3414 }
3415
3416 void JNIid::deallocate(JNIid* current) {
3417 while (current != NULL) {
3418 JNIid* next = current->next();
3419 delete current;
3420 current = next;
3421 }
3422 }
3423
3424
3425 void JNIid::verify(Klass* holder) {
3426 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields();
3427 int end_field_offset;
3428 end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize);
3429
3430 JNIid* current = this;
3431 while (current != NULL) {
3432 guarantee(current->holder() == holder, "Invalid klass in JNIid");
3433 #ifdef ASSERT
3434 int o = current->offset();
3435 if (current->is_static_field_id()) {
3436 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid");
3437 }
3438 #endif
3439 current = current->next();
3440 }
3441 }
3442
3443
3444 #ifdef ASSERT
3445 void InstanceKlass::set_init_state(ClassState state) {
3446 bool good_state = is_shared() ? (_init_state <= state)
3447 : (_init_state < state);
3448 assert(good_state || state == allocated, "illegal state transition");
3449 _init_state = (u1)state;
3450 }
3451 #endif
3452
3453
3454 // RedefineClasses() support for previous versions:
3455
3456 // Purge previous versions
3457 void InstanceKlass::purge_previous_versions(InstanceKlass* ik) {
3458 if (ik->previous_versions() != NULL) {
3459 // This klass has previous versions so see what we can cleanup
3460 // while it is safe to do so.
3461
3462 int deleted_count = 0; // leave debugging breadcrumbs
3463 int live_count = 0;
3464 ClassLoaderData* loader_data = ik->class_loader_data();
3465 assert(loader_data != NULL, "should never be null");
3466
3467 // RC_TRACE macro has an embedded ResourceMark
3468 RC_TRACE(0x00000200, ("purge: %s: previous versions", ik->external_name()));
3469
3470 // previous versions are linked together through the InstanceKlass
3471 InstanceKlass* pv_node = ik->previous_versions();
3472 InstanceKlass* last = ik;
3473 int version = 0;
3474
3475 // check the previous versions list
3476 for (; pv_node != NULL; ) {
3477
3478 ConstantPool* pvcp = pv_node->constants();
3479 assert(pvcp != NULL, "cp ref was unexpectedly cleared");
3480
3481 if (!pvcp->on_stack()) {
3482 // If the constant pool isn't on stack, none of the methods
3483 // are executing. Unlink this previous_version.
3484 // The previous version InstanceKlass is on the ClassLoaderData deallocate list
3485 // so will be deallocated during the next phase of class unloading.
3486 pv_node = pv_node->previous_versions();
3487 last->link_previous_versions(pv_node);
3488 deleted_count++;
3489 version++;
3490 continue;
3491 } else {
3492 RC_TRACE(0x00000200, ("purge: previous version " INTPTR_FORMAT " is alive",
3493 pv_node));
3494 assert(pvcp->pool_holder() != NULL, "Constant pool with no holder");
3495 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
3496 live_count++;
3497 }
3498
3499 // At least one method is live in this previous version so clean its MethodData.
3500 // Reset dead EMCP methods not to get breakpoints.
3501 // All methods are deallocated when all of the methods for this class are no
3502 // longer running.
3503 Array<Method*>* method_refs = pv_node->methods();
3504 if (method_refs != NULL) {
3505 RC_TRACE(0x00000200, ("purge: previous methods length=%d",
3506 method_refs->length()));
3507 for (int j = 0; j < method_refs->length(); j++) {
3508 Method* method = method_refs->at(j);
3509
3510 if (!method->on_stack()) {
3511 // no breakpoints for non-running methods
3512 if (method->is_running_emcp()) {
3513 method->set_running_emcp(false);
3514 }
3515 } else {
3516 assert (method->is_obsolete() || method->is_running_emcp(),
3517 "emcp method cannot run after emcp bit is cleared");
3518 // RC_TRACE macro has an embedded ResourceMark
3519 RC_TRACE(0x00000200,
3520 ("purge: %s(%s): prev method @%d in version @%d is alive",
3521 method->name()->as_C_string(),
3522 method->signature()->as_C_string(), j, version));
3523 if (method->method_data() != NULL) {
3524 // Clean out any weak method links for running methods
3525 // (also should include not EMCP methods)
3526 method->method_data()->clean_weak_method_links();
3527 }
3528 }
3529 }
3530 }
3531 // next previous version
3532 last = pv_node;
3533 pv_node = pv_node->previous_versions();
3534 version++;
3535 }
3536 RC_TRACE(0x00000200,
3537 ("purge: previous version stats: live=%d, deleted=%d", live_count,
3538 deleted_count));
3539 }
3540
3541 // Clean MethodData of this class's methods so they don't refer to
3542 // old methods that are no longer running.
3543 Array<Method*>* methods = ik->methods();
3544 int num_methods = methods->length();
3545 for (int index2 = 0; index2 < num_methods; ++index2) {
3546 if (methods->at(index2)->method_data() != NULL) {
3547 methods->at(index2)->method_data()->clean_weak_method_links();
3548 }
3549 }
3550 }
3551
3552 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods,
3553 int emcp_method_count) {
3554 int obsolete_method_count = old_methods->length() - emcp_method_count;
3555
3556 if (emcp_method_count != 0 && obsolete_method_count != 0 &&
3557 _previous_versions != NULL) {
3558 // We have a mix of obsolete and EMCP methods so we have to
3559 // clear out any matching EMCP method entries the hard way.
3560 int local_count = 0;
3561 for (int i = 0; i < old_methods->length(); i++) {
3562 Method* old_method = old_methods->at(i);
3563 if (old_method->is_obsolete()) {
3564 // only obsolete methods are interesting
3565 Symbol* m_name = old_method->name();
3566 Symbol* m_signature = old_method->signature();
3567
3568 // previous versions are linked together through the InstanceKlass
3569 int j = 0;
3570 for (InstanceKlass* prev_version = _previous_versions;
3571 prev_version != NULL;
3572 prev_version = prev_version->previous_versions(), j++) {
3573
3574 Array<Method*>* method_refs = prev_version->methods();
3575 for (int k = 0; k < method_refs->length(); k++) {
3576 Method* method = method_refs->at(k);
3577
3578 if (!method->is_obsolete() &&
3579 method->name() == m_name &&
3580 method->signature() == m_signature) {
3581 // The current RedefineClasses() call has made all EMCP
3582 // versions of this method obsolete so mark it as obsolete
3583 RC_TRACE(0x00000400,
3584 ("add: %s(%s): flush obsolete method @%d in version @%d",
3585 m_name->as_C_string(), m_signature->as_C_string(), k, j));
3586
3587 method->set_is_obsolete();
3588 break;
3589 }
3590 }
3591
3592 // The previous loop may not find a matching EMCP method, but
3593 // that doesn't mean that we can optimize and not go any
3594 // further back in the PreviousVersion generations. The EMCP
3595 // method for this generation could have already been made obsolete,
3596 // but there still may be an older EMCP method that has not
3597 // been made obsolete.
3598 }
3599
3600 if (++local_count >= obsolete_method_count) {
3601 // no more obsolete methods so bail out now
3602 break;
3603 }
3604 }
3605 }
3606 }
3607 }
3608
3609 // Save the scratch_class as the previous version if any of the methods are running.
3610 // The previous_versions are used to set breakpoints in EMCP methods and they are
3611 // also used to clean MethodData links to redefined methods that are no longer running.
3612 void InstanceKlass::add_previous_version(instanceKlassHandle scratch_class,
3613 int emcp_method_count) {
3614 assert(Thread::current()->is_VM_thread(),
3615 "only VMThread can add previous versions");
3616
3617 // RC_TRACE macro has an embedded ResourceMark
3618 RC_TRACE(0x00000400, ("adding previous version ref for %s, EMCP_cnt=%d",
3619 scratch_class->external_name(), emcp_method_count));
3620
3621 // Clean out old previous versions
3622 purge_previous_versions(this);
3623
3624 // Mark newly obsolete methods in remaining previous versions. An EMCP method from
3625 // a previous redefinition may be made obsolete by this redefinition.
3626 Array<Method*>* old_methods = scratch_class->methods();
3627 mark_newly_obsolete_methods(old_methods, emcp_method_count);
3628
3629 // If the constant pool for this previous version of the class
3630 // is not marked as being on the stack, then none of the methods
3631 // in this previous version of the class are on the stack so
3632 // we don't need to add this as a previous version.
3633 ConstantPool* cp_ref = scratch_class->constants();
3634 if (!cp_ref->on_stack()) {
3635 RC_TRACE(0x00000400, ("add: scratch class not added; no methods are running"));
3636 return;
3637 }
3638
3639 if (emcp_method_count != 0) {
3640 // At least one method is still running, check for EMCP methods
3641 for (int i = 0; i < old_methods->length(); i++) {
3642 Method* old_method = old_methods->at(i);
3643 if (!old_method->is_obsolete() && old_method->on_stack()) {
3644 // if EMCP method (not obsolete) is on the stack, mark as EMCP so that
3645 // we can add breakpoints for it.
3646
3647 // We set the method->on_stack bit during safepoints for class redefinition and
3648 // class unloading and use this bit to set the is_running_emcp bit.
3649 // After the safepoint, the on_stack bit is cleared and the running emcp
3650 // method may exit. If so, we would set a breakpoint in a method that
3651 // is never reached, but this won't be noticeable to the programmer.
3652 old_method->set_running_emcp(true);
3653 RC_TRACE(0x00000400, ("add: EMCP method %s is on_stack " INTPTR_FORMAT,
3654 old_method->name_and_sig_as_C_string(), old_method));
3655 } else if (!old_method->is_obsolete()) {
3656 RC_TRACE(0x00000400, ("add: EMCP method %s is NOT on_stack " INTPTR_FORMAT,
3657 old_method->name_and_sig_as_C_string(), old_method));
3658 }
3659 }
3660 }
3661
3662 // Add previous version if any methods are still running.
3663 RC_TRACE(0x00000400, ("add: scratch class added; one of its methods is on_stack"));
3664 assert(scratch_class->previous_versions() == NULL, "shouldn't have a previous version");
3665 scratch_class->link_previous_versions(previous_versions());
3666 link_previous_versions(scratch_class());
3667 } // end add_previous_version()
3668
3669
3670 Method* InstanceKlass::method_with_idnum(int idnum) {
3671 Method* m = NULL;
3672 if (idnum < methods()->length()) {
3673 m = methods()->at(idnum);
3674 }
3675 if (m == NULL || m->method_idnum() != idnum) {
3676 for (int index = 0; index < methods()->length(); ++index) {
3677 m = methods()->at(index);
3678 if (m->method_idnum() == idnum) {
3679 return m;
3680 }
3681 }
3682 // None found, return null for the caller to handle.
3683 return NULL;
3684 }
3685 return m;
3686 }
3687
3688 jint InstanceKlass::get_cached_class_file_len() {
3689 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
3690 }
3691
3692 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
3693 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
3694 }