1 /*
2 * Copyright (c) 1997, 2015, 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/shared/collectedHeap.inline.hpp"
32 #include "gc/shared/specialized_oop_closures.hpp"
33 #include "interpreter/oopMapCache.hpp"
34 #include "interpreter/rewriter.hpp"
35 #include "jvmtifiles/jvmti.h"
36 #include "memory/heapInspection.hpp"
37 #include "memory/iterator.inline.hpp"
38 #include "memory/metadataFactory.hpp"
39 #include "memory/oopFactory.hpp"
40 #include "oops/fieldStreams.hpp"
41 #include "oops/instanceClassLoaderKlass.hpp"
42 #include "oops/instanceKlass.inline.hpp"
43 #include "oops/instanceMirrorKlass.hpp"
44 #include "oops/instanceOop.hpp"
45 #include "oops/klass.inline.hpp"
46 #include "oops/method.hpp"
47 #include "oops/oop.inline.hpp"
48 #include "oops/symbol.hpp"
49 #include "prims/jvmtiExport.hpp"
50 #include "prims/jvmtiRedefineClasses.hpp"
51 #include "prims/jvmtiRedefineClassesTrace.hpp"
52 #include "prims/jvmtiThreadState.hpp"
53 #include "prims/methodComparator.hpp"
54 #include "runtime/atomic.inline.hpp"
55 #include "runtime/fieldDescriptor.hpp"
56 #include "runtime/handles.inline.hpp"
57 #include "runtime/javaCalls.hpp"
58 #include "runtime/mutexLocker.hpp"
59 #include "runtime/orderAccess.inline.hpp"
60 #include "runtime/thread.inline.hpp"
61 #include "services/classLoadingService.hpp"
62 #include "services/threadService.hpp"
63 #include "utilities/dtrace.hpp"
64 #include "utilities/macros.hpp"
65 #ifdef COMPILER1
66 #include "c1/c1_Compiler.hpp"
67 #endif
68
69 #ifdef DTRACE_ENABLED
70
71
72 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED
73 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE
74 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT
75 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS
76 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED
77 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT
78 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR
79 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END
80 #define DTRACE_CLASSINIT_PROBE(type, clss, thread_type) \
81 { \
82 char* data = NULL; \
83 int len = 0; \
84 Symbol* name = (clss)->name(); \
85 if (name != NULL) { \
86 data = (char*)name->bytes(); \
87 len = name->utf8_length(); \
88 } \
89 HOTSPOT_CLASS_INITIALIZATION_##type( \
90 data, len, (clss)->class_loader(), thread_type); \
91 }
92
93 #define DTRACE_CLASSINIT_PROBE_WAIT(type, clss, thread_type, wait) \
94 { \
95 char* data = NULL; \
96 int len = 0; \
97 Symbol* name = (clss)->name(); \
98 if (name != NULL) { \
99 data = (char*)name->bytes(); \
100 len = name->utf8_length(); \
101 } \
102 HOTSPOT_CLASS_INITIALIZATION_##type( \
103 data, len, (clss)->class_loader(), thread_type, wait); \
104 }
105
106 #else // ndef DTRACE_ENABLED
107
108 #define DTRACE_CLASSINIT_PROBE(type, clss, thread_type)
109 #define DTRACE_CLASSINIT_PROBE_WAIT(type, clss, thread_type, wait)
110
111 #endif // ndef DTRACE_ENABLED
112
113 volatile int InstanceKlass::_total_instanceKlass_count = 0;
114
115 InstanceKlass* InstanceKlass::allocate_instance_klass(
116 ClassLoaderData* loader_data,
117 int vtable_len,
118 int itable_len,
119 int static_field_size,
120 int nonstatic_oop_map_size,
121 ReferenceType rt,
122 AccessFlags access_flags,
123 Symbol* name,
124 Klass* super_klass,
125 bool is_anonymous,
126 TRAPS) {
127
128 int size = InstanceKlass::size(vtable_len, itable_len, nonstatic_oop_map_size,
129 access_flags.is_interface(), is_anonymous);
130
131 // Allocation
132 InstanceKlass* ik;
133 if (rt == REF_NONE) {
134 if (name == vmSymbols::java_lang_Class()) {
135 ik = new (loader_data, size, THREAD) InstanceMirrorKlass(
136 vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt,
137 access_flags, is_anonymous);
138 } else if (name == vmSymbols::java_lang_ClassLoader() ||
139 (SystemDictionary::ClassLoader_klass_loaded() &&
140 super_klass != NULL &&
141 super_klass->is_subtype_of(SystemDictionary::ClassLoader_klass()))) {
142 ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(
143 vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt,
144 access_flags, is_anonymous);
145 } else {
146 // normal class
147 ik = new (loader_data, size, THREAD) InstanceKlass(
148 vtable_len, itable_len, static_field_size, nonstatic_oop_map_size,
149 InstanceKlass::_misc_kind_other, rt, access_flags, is_anonymous);
150 }
151 } else {
152 // reference klass
153 ik = new (loader_data, size, THREAD) InstanceRefKlass(
154 vtable_len, itable_len, static_field_size, nonstatic_oop_map_size, rt,
155 access_flags, is_anonymous);
156 }
157
158 // Check for pending exception before adding to the loader data and incrementing
159 // class count. Can get OOM here.
160 if (HAS_PENDING_EXCEPTION) {
161 return NULL;
162 }
163
164 // Add all classes to our internal class loader list here,
165 // including classes in the bootstrap (NULL) class loader.
166 loader_data->add_class(ik);
167
168 Atomic::inc(&_total_instanceKlass_count);
169 return ik;
170 }
171
172
173 // copy method ordering from resource area to Metaspace
174 void InstanceKlass::copy_method_ordering(intArray* m, TRAPS) {
175 if (m != NULL) {
176 // allocate a new array and copy contents (memcpy?)
177 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
178 for (int i = 0; i < m->length(); i++) {
179 _method_ordering->at_put(i, m->at(i));
180 }
181 } else {
182 _method_ordering = Universe::the_empty_int_array();
183 }
184 }
185
186 // create a new array of vtable_indices for default methods
187 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
188 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
189 assert(default_vtable_indices() == NULL, "only create once");
190 set_default_vtable_indices(vtable_indices);
191 return vtable_indices;
192 }
193
194 InstanceKlass::InstanceKlass(int vtable_len,
195 int itable_len,
196 int static_field_size,
197 int nonstatic_oop_map_size,
198 unsigned kind,
199 ReferenceType rt,
200 AccessFlags access_flags,
201 bool is_anonymous) {
202 No_Safepoint_Verifier no_safepoint; // until k becomes parsable
203
204 int iksize = InstanceKlass::size(vtable_len, itable_len, nonstatic_oop_map_size,
205 access_flags.is_interface(), is_anonymous);
206 set_vtable_length(vtable_len);
207 set_itable_length(itable_len);
208 set_static_field_size(static_field_size);
209 set_nonstatic_oop_map_size(nonstatic_oop_map_size);
210 set_access_flags(access_flags);
211 _misc_flags = 0; // initialize to zero
212 set_kind(kind);
213 set_is_anonymous(is_anonymous);
214 assert(size() == iksize, "wrong size for object");
215
216 set_array_klasses(NULL);
217 set_methods(NULL);
218 set_method_ordering(NULL);
219 set_default_methods(NULL);
220 set_default_vtable_indices(NULL);
221 set_local_interfaces(NULL);
222 set_transitive_interfaces(NULL);
223 init_implementor();
224 set_fields(NULL, 0);
225 set_constants(NULL);
226 set_class_loader_data(NULL);
227 set_source_file_name_index(0);
228 set_source_debug_extension(NULL, 0);
229 set_array_name(NULL);
230 set_inner_classes(NULL);
231 set_static_oop_field_count(0);
232 set_nonstatic_field_size(0);
233 set_is_marked_dependent(false);
234 _dep_context = DependencyContext::EMPTY;
235 set_init_state(InstanceKlass::allocated);
236 set_init_thread(NULL);
237 set_reference_type(rt);
238 set_oop_map_cache(NULL);
239 set_jni_ids(NULL);
240 set_osr_nmethods_head(NULL);
241 set_breakpoints(NULL);
242 init_previous_versions();
243 set_generic_signature_index(0);
244 release_set_methods_jmethod_ids(NULL);
245 set_annotations(NULL);
246 set_jvmti_cached_class_field_map(NULL);
247 set_initial_method_idnum(0);
248 set_jvmti_cached_class_field_map(NULL);
249 set_cached_class_file(NULL);
250 set_initial_method_idnum(0);
251 set_minor_version(0);
252 set_major_version(0);
253 NOT_PRODUCT(_verify_count = 0;)
254
255 // initialize the non-header words to zero
256 intptr_t* p = (intptr_t*)this;
257 for (int index = InstanceKlass::header_size(); index < iksize; index++) {
258 p[index] = NULL_WORD;
259 }
260
261 // Set temporary value until parseClassFile updates it with the real instance
262 // size.
263 set_layout_helper(Klass::instance_layout_helper(0, true));
264 }
265
266
267 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
268 Array<Method*>* methods) {
269 if (methods != NULL && methods != Universe::the_empty_method_array() &&
270 !methods->is_shared()) {
271 for (int i = 0; i < methods->length(); i++) {
272 Method* method = methods->at(i);
273 if (method == NULL) continue; // maybe null if error processing
274 // Only want to delete methods that are not executing for RedefineClasses.
275 // The previous version will point to them so they're not totally dangling
276 assert (!method->on_stack(), "shouldn't be called with methods on stack");
277 MetadataFactory::free_metadata(loader_data, method);
278 }
279 MetadataFactory::free_array<Method*>(loader_data, methods);
280 }
281 }
282
283 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
284 Klass* super_klass,
285 Array<Klass*>* local_interfaces,
286 Array<Klass*>* transitive_interfaces) {
287 // Only deallocate transitive interfaces if not empty, same as super class
288 // or same as local interfaces. See code in parseClassFile.
289 Array<Klass*>* ti = transitive_interfaces;
290 if (ti != Universe::the_empty_klass_array() && ti != local_interfaces) {
291 // check that the interfaces don't come from super class
292 Array<Klass*>* sti = (super_klass == NULL) ? NULL :
293 InstanceKlass::cast(super_klass)->transitive_interfaces();
294 if (ti != sti && ti != NULL && !ti->is_shared()) {
295 MetadataFactory::free_array<Klass*>(loader_data, ti);
296 }
297 }
298
299 // local interfaces can be empty
300 if (local_interfaces != Universe::the_empty_klass_array() &&
301 local_interfaces != NULL && !local_interfaces->is_shared()) {
302 MetadataFactory::free_array<Klass*>(loader_data, local_interfaces);
303 }
304 }
305
306 // This function deallocates the metadata and C heap pointers that the
307 // InstanceKlass points to.
308 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
309
310 // Orphan the mirror first, CMS thinks it's still live.
311 if (java_mirror() != NULL) {
312 java_lang_Class::set_klass(java_mirror(), NULL);
313 }
314
315 // Need to take this class off the class loader data list.
316 loader_data->remove_class(this);
317
318 // The array_klass for this class is created later, after error handling.
319 // For class redefinition, we keep the original class so this scratch class
320 // doesn't have an array class. Either way, assert that there is nothing
321 // to deallocate.
322 assert(array_klasses() == NULL, "array classes shouldn't be created for this class yet");
323
324 // Release C heap allocated data that this might point to, which includes
325 // reference counting symbol names.
326 release_C_heap_structures();
327
328 deallocate_methods(loader_data, methods());
329 set_methods(NULL);
330
331 if (method_ordering() != NULL &&
332 method_ordering() != Universe::the_empty_int_array() &&
333 !method_ordering()->is_shared()) {
334 MetadataFactory::free_array<int>(loader_data, method_ordering());
335 }
336 set_method_ordering(NULL);
337
338 // default methods can be empty
339 if (default_methods() != NULL &&
340 default_methods() != Universe::the_empty_method_array() &&
341 !default_methods()->is_shared()) {
342 MetadataFactory::free_array<Method*>(loader_data, default_methods());
343 }
344 // Do NOT deallocate the default methods, they are owned by superinterfaces.
345 set_default_methods(NULL);
346
347 // default methods vtable indices can be empty
348 if (default_vtable_indices() != NULL &&
349 !default_vtable_indices()->is_shared()) {
350 MetadataFactory::free_array<int>(loader_data, default_vtable_indices());
351 }
352 set_default_vtable_indices(NULL);
353
354
355 // This array is in Klass, but remove it with the InstanceKlass since
356 // this place would be the only caller and it can share memory with transitive
357 // interfaces.
358 if (secondary_supers() != NULL &&
359 secondary_supers() != Universe::the_empty_klass_array() &&
360 secondary_supers() != transitive_interfaces() &&
361 !secondary_supers()->is_shared()) {
362 MetadataFactory::free_array<Klass*>(loader_data, secondary_supers());
363 }
364 set_secondary_supers(NULL);
365
366 deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces());
367 set_transitive_interfaces(NULL);
368 set_local_interfaces(NULL);
369
370 if (fields() != NULL && !fields()->is_shared()) {
371 MetadataFactory::free_array<jushort>(loader_data, fields());
372 }
373 set_fields(NULL, 0);
374
375 // If a method from a redefined class is using this constant pool, don't
376 // delete it, yet. The new class's previous version will point to this.
377 if (constants() != NULL) {
378 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack");
379 if (!constants()->is_shared()) {
380 MetadataFactory::free_metadata(loader_data, constants());
381 }
382 // Delete any cached resolution errors for the constant pool
383 SystemDictionary::delete_resolution_error(constants());
384
385 set_constants(NULL);
386 }
387
388 if (inner_classes() != NULL &&
389 inner_classes() != Universe::the_empty_short_array() &&
390 !inner_classes()->is_shared()) {
391 MetadataFactory::free_array<jushort>(loader_data, inner_classes());
392 }
393 set_inner_classes(NULL);
394
395 // We should deallocate the Annotations instance if it's not in shared spaces.
396 if (annotations() != NULL && !annotations()->is_shared()) {
397 MetadataFactory::free_metadata(loader_data, annotations());
398 }
399 set_annotations(NULL);
400 }
401
402 bool InstanceKlass::should_be_initialized() const {
403 return !is_initialized();
404 }
405
406 klassVtable* InstanceKlass::vtable() const {
407 return new klassVtable(this, start_of_vtable(), vtable_length() / vtableEntry::size());
408 }
409
410 klassItable* InstanceKlass::itable() const {
411 return new klassItable(instanceKlassHandle(this));
412 }
413
414 void InstanceKlass::eager_initialize(Thread *thread) {
415 if (!EagerInitialization) return;
416
417 if (this->is_not_initialized()) {
418 // abort if the the class has a class initializer
419 if (this->class_initializer() != NULL) return;
420
421 // abort if it is java.lang.Object (initialization is handled in genesis)
422 Klass* super = this->super();
423 if (super == NULL) return;
424
425 // abort if the super class should be initialized
426 if (!InstanceKlass::cast(super)->is_initialized()) return;
427
428 // call body to expose the this pointer
429 instanceKlassHandle this_k(thread, this);
430 eager_initialize_impl(this_k);
431 }
432 }
433
434 // JVMTI spec thinks there are signers and protection domain in the
435 // instanceKlass. These accessors pretend these fields are there.
436 // The hprof specification also thinks these fields are in InstanceKlass.
437 oop InstanceKlass::protection_domain() const {
438 // return the protection_domain from the mirror
439 return java_lang_Class::protection_domain(java_mirror());
440 }
441
442 // To remove these from requires an incompatible change and CCC request.
443 objArrayOop InstanceKlass::signers() const {
444 // return the signers from the mirror
445 return java_lang_Class::signers(java_mirror());
446 }
447
448 oop InstanceKlass::init_lock() const {
449 // return the init lock from the mirror
450 oop lock = java_lang_Class::init_lock(java_mirror());
451 // Prevent reordering with any access of initialization state
452 OrderAccess::loadload();
453 assert((oop)lock != NULL || !is_not_initialized(), // initialized or in_error state
454 "only fully initialized state can have a null lock");
455 return lock;
456 }
457
458 // Set the initialization lock to null so the object can be GC'ed. Any racing
459 // threads to get this lock will see a null lock and will not lock.
460 // That's okay because they all check for initialized state after getting
461 // the lock and return.
462 void InstanceKlass::fence_and_clear_init_lock() {
463 // make sure previous stores are all done, notably the init_state.
464 OrderAccess::storestore();
465 java_lang_Class::set_init_lock(java_mirror(), NULL);
466 assert(!is_not_initialized(), "class must be initialized now");
467 }
468
469 void InstanceKlass::eager_initialize_impl(instanceKlassHandle this_k) {
470 EXCEPTION_MARK;
471 oop init_lock = this_k->init_lock();
472 ObjectLocker ol(init_lock, THREAD, init_lock != NULL);
473
474 // abort if someone beat us to the initialization
475 if (!this_k->is_not_initialized()) return; // note: not equivalent to is_initialized()
476
477 ClassState old_state = this_k->init_state();
478 link_class_impl(this_k, true, THREAD);
479 if (HAS_PENDING_EXCEPTION) {
480 CLEAR_PENDING_EXCEPTION;
481 // Abort if linking the class throws an exception.
482
483 // Use a test to avoid redundantly resetting the state if there's
484 // no change. Set_init_state() asserts that state changes make
485 // progress, whereas here we might just be spinning in place.
486 if( old_state != this_k->_init_state )
487 this_k->set_init_state (old_state);
488 } else {
489 // linking successfull, mark class as initialized
490 this_k->set_init_state (fully_initialized);
491 this_k->fence_and_clear_init_lock();
492 // trace
493 if (TraceClassInitialization) {
494 ResourceMark rm(THREAD);
495 tty->print_cr("[Initialized %s without side effects]", this_k->external_name());
496 }
497 }
498 }
499
500
501 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization
502 // process. The step comments refers to the procedure described in that section.
503 // Note: implementation moved to static method to expose the this pointer.
504 void InstanceKlass::initialize(TRAPS) {
505 if (this->should_be_initialized()) {
506 HandleMark hm(THREAD);
507 instanceKlassHandle this_k(THREAD, this);
508 initialize_impl(this_k, CHECK);
509 // Note: at this point the class may be initialized
510 // OR it may be in the state of being initialized
511 // in case of recursive initialization!
512 } else {
513 assert(is_initialized(), "sanity check");
514 }
515 }
516
517
518 bool InstanceKlass::verify_code(
519 instanceKlassHandle this_k, bool throw_verifyerror, TRAPS) {
520 // 1) Verify the bytecodes
521 Verifier::Mode mode =
522 throw_verifyerror ? Verifier::ThrowException : Verifier::NoException;
523 return Verifier::verify(this_k, mode, this_k->should_verify_class(), THREAD);
524 }
525
526
527 // Used exclusively by the shared spaces dump mechanism to prevent
528 // classes mapped into the shared regions in new VMs from appearing linked.
529
530 void InstanceKlass::unlink_class() {
531 assert(is_linked(), "must be linked");
532 _init_state = loaded;
533 }
534
535 void InstanceKlass::link_class(TRAPS) {
536 assert(is_loaded(), "must be loaded");
537 if (!is_linked()) {
538 HandleMark hm(THREAD);
539 instanceKlassHandle this_k(THREAD, this);
540 link_class_impl(this_k, true, CHECK);
541 }
542 }
543
544 // Called to verify that a class can link during initialization, without
545 // throwing a VerifyError.
546 bool InstanceKlass::link_class_or_fail(TRAPS) {
547 assert(is_loaded(), "must be loaded");
548 if (!is_linked()) {
549 HandleMark hm(THREAD);
550 instanceKlassHandle this_k(THREAD, this);
551 link_class_impl(this_k, false, CHECK_false);
552 }
553 return is_linked();
554 }
555
556 bool InstanceKlass::link_class_impl(
557 instanceKlassHandle this_k, bool throw_verifyerror, TRAPS) {
558 // check for error state
559 if (this_k->is_in_error_state()) {
560 ResourceMark rm(THREAD);
561 THROW_MSG_(vmSymbols::java_lang_NoClassDefFoundError(),
562 this_k->external_name(), false);
563 }
564 // return if already verified
565 if (this_k->is_linked()) {
566 return true;
567 }
568
569 // Timing
570 // timer handles recursion
571 assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl");
572 JavaThread* jt = (JavaThread*)THREAD;
573
574 // link super class before linking this class
575 instanceKlassHandle super(THREAD, this_k->super());
576 if (super.not_null()) {
577 if (super->is_interface()) { // check if super class is an interface
578 ResourceMark rm(THREAD);
579 Exceptions::fthrow(
580 THREAD_AND_LOCATION,
581 vmSymbols::java_lang_IncompatibleClassChangeError(),
582 "class %s has interface %s as super class",
583 this_k->external_name(),
584 super->external_name()
585 );
586 return false;
587 }
588
589 link_class_impl(super, throw_verifyerror, CHECK_false);
590 }
591
592 // link all interfaces implemented by this class before linking this class
593 Array<Klass*>* interfaces = this_k->local_interfaces();
594 int num_interfaces = interfaces->length();
595 for (int index = 0; index < num_interfaces; index++) {
596 HandleMark hm(THREAD);
597 instanceKlassHandle ih(THREAD, interfaces->at(index));
598 link_class_impl(ih, throw_verifyerror, CHECK_false);
599 }
600
601 // in case the class is linked in the process of linking its superclasses
602 if (this_k->is_linked()) {
603 return true;
604 }
605
606 // trace only the link time for this klass that includes
607 // the verification time
608 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
609 ClassLoader::perf_class_link_selftime(),
610 ClassLoader::perf_classes_linked(),
611 jt->get_thread_stat()->perf_recursion_counts_addr(),
612 jt->get_thread_stat()->perf_timers_addr(),
613 PerfClassTraceTime::CLASS_LINK);
614
615 // verification & rewriting
616 {
617 oop init_lock = this_k->init_lock();
618 ObjectLocker ol(init_lock, THREAD, init_lock != NULL);
619 // rewritten will have been set if loader constraint error found
620 // on an earlier link attempt
621 // don't verify or rewrite if already rewritten
622
623 if (!this_k->is_linked()) {
624 if (!this_k->is_rewritten()) {
625 {
626 bool verify_ok = verify_code(this_k, throw_verifyerror, THREAD);
627 if (!verify_ok) {
628 return false;
629 }
630 }
631
632 // Just in case a side-effect of verify linked this class already
633 // (which can sometimes happen since the verifier loads classes
634 // using custom class loaders, which are free to initialize things)
635 if (this_k->is_linked()) {
636 return true;
637 }
638
639 // also sets rewritten
640 this_k->rewrite_class(CHECK_false);
641 }
642
643 // relocate jsrs and link methods after they are all rewritten
644 this_k->link_methods(CHECK_false);
645
646 // Initialize the vtable and interface table after
647 // methods have been rewritten since rewrite may
648 // fabricate new Method*s.
649 // also does loader constraint checking
650 if (!this_k()->is_shared()) {
651 ResourceMark rm(THREAD);
652 this_k->vtable()->initialize_vtable(true, CHECK_false);
653 this_k->itable()->initialize_itable(true, CHECK_false);
654 }
655 #ifdef ASSERT
656 else {
657 ResourceMark rm(THREAD);
658 this_k->vtable()->verify(tty, true);
659 // In case itable verification is ever added.
660 // this_k->itable()->verify(tty, true);
661 }
662 #endif
663 this_k->set_init_state(linked);
664 if (JvmtiExport::should_post_class_prepare()) {
665 Thread *thread = THREAD;
666 assert(thread->is_Java_thread(), "thread->is_Java_thread()");
667 JvmtiExport::post_class_prepare((JavaThread *) thread, this_k());
668 }
669 }
670 }
671 return true;
672 }
673
674
675 // Rewrite the byte codes of all of the methods of a class.
676 // The rewriter must be called exactly once. Rewriting must happen after
677 // verification but before the first method of the class is executed.
678 void InstanceKlass::rewrite_class(TRAPS) {
679 assert(is_loaded(), "must be loaded");
680 instanceKlassHandle this_k(THREAD, this);
681 if (this_k->is_rewritten()) {
682 assert(this_k()->is_shared(), "rewriting an unshared class?");
683 return;
684 }
685 Rewriter::rewrite(this_k, CHECK);
686 this_k->set_rewritten();
687 }
688
689 // Now relocate and link method entry points after class is rewritten.
690 // This is outside is_rewritten flag. In case of an exception, it can be
691 // executed more than once.
692 void InstanceKlass::link_methods(TRAPS) {
693 int len = methods()->length();
694 for (int i = len-1; i >= 0; i--) {
695 methodHandle m(THREAD, methods()->at(i));
696
697 // Set up method entry points for compiler and interpreter .
698 m->link_method(m, CHECK);
699 }
700 }
701
702 // Eagerly initialize superinterfaces that declare default methods (concrete instance: any access)
703 void InstanceKlass::initialize_super_interfaces(instanceKlassHandle this_k, TRAPS) {
704 if (this_k->has_default_methods()) {
705 for (int i = 0; i < this_k->local_interfaces()->length(); ++i) {
706 Klass* iface = this_k->local_interfaces()->at(i);
707 InstanceKlass* ik = InstanceKlass::cast(iface);
708 if (ik->should_be_initialized()) {
709 if (ik->has_default_methods()) {
710 ik->initialize_super_interfaces(ik, THREAD);
711 }
712 // Only initialize() interfaces that "declare" concrete methods.
713 // has_default_methods drives searching superinterfaces since it
714 // means has_default_methods in its superinterface hierarchy
715 if (!HAS_PENDING_EXCEPTION && ik->declares_default_methods()) {
716 ik->initialize(THREAD);
717 }
718 if (HAS_PENDING_EXCEPTION) {
719 Handle e(THREAD, PENDING_EXCEPTION);
720 CLEAR_PENDING_EXCEPTION;
721 {
722 EXCEPTION_MARK;
723 // Locks object, set state, and notify all waiting threads
724 this_k->set_initialization_state_and_notify(
725 initialization_error, THREAD);
726
727 // ignore any exception thrown, superclass initialization error is
728 // thrown below
729 CLEAR_PENDING_EXCEPTION;
730 }
731 THROW_OOP(e());
732 }
733 }
734 }
735 }
736 }
737
738 void InstanceKlass::initialize_impl(instanceKlassHandle this_k, TRAPS) {
739 // Make sure klass is linked (verified) before initialization
740 // A class could already be verified, since it has been reflected upon.
741 this_k->link_class(CHECK);
742
743 DTRACE_CLASSINIT_PROBE(required, InstanceKlass::cast(this_k()), -1);
744
745 bool wait = false;
746
747 // refer to the JVM book page 47 for description of steps
748 // Step 1
749 {
750 oop init_lock = this_k->init_lock();
751 ObjectLocker ol(init_lock, THREAD, init_lock != NULL);
752
753 Thread *self = THREAD; // it's passed the current thread
754
755 // Step 2
756 // If we were to use wait() instead of waitInterruptibly() then
757 // we might end up throwing IE from link/symbol resolution sites
758 // that aren't expected to throw. This would wreak havoc. See 6320309.
759 while(this_k->is_being_initialized() && !this_k->is_reentrant_initialization(self)) {
760 wait = true;
761 ol.waitUninterruptibly(CHECK);
762 }
763
764 // Step 3
765 if (this_k->is_being_initialized() && this_k->is_reentrant_initialization(self)) {
766 DTRACE_CLASSINIT_PROBE_WAIT(recursive, InstanceKlass::cast(this_k()), -1,wait);
767 return;
768 }
769
770 // Step 4
771 if (this_k->is_initialized()) {
772 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, InstanceKlass::cast(this_k()), -1,wait);
773 return;
774 }
775
776 // Step 5
777 if (this_k->is_in_error_state()) {
778 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, InstanceKlass::cast(this_k()), -1,wait);
779 ResourceMark rm(THREAD);
780 const char* desc = "Could not initialize class ";
781 const char* className = this_k->external_name();
782 size_t msglen = strlen(desc) + strlen(className) + 1;
783 char* message = NEW_RESOURCE_ARRAY(char, msglen);
784 if (NULL == message) {
785 // Out of memory: can't create detailed error message
786 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className);
787 } else {
788 jio_snprintf(message, msglen, "%s%s", desc, className);
789 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message);
790 }
791 }
792
793 // Step 6
794 this_k->set_init_state(being_initialized);
795 this_k->set_init_thread(self);
796 }
797
798 // Step 7
799 Klass* super_klass = this_k->super();
800 if (super_klass != NULL && !this_k->is_interface() && super_klass->should_be_initialized()) {
801 super_klass->initialize(THREAD);
802
803 if (HAS_PENDING_EXCEPTION) {
804 Handle e(THREAD, PENDING_EXCEPTION);
805 CLEAR_PENDING_EXCEPTION;
806 {
807 EXCEPTION_MARK;
808 this_k->set_initialization_state_and_notify(initialization_error, THREAD); // Locks object, set state, and notify all waiting threads
809 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, superclass initialization error is thrown below
810 }
811 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, InstanceKlass::cast(this_k()), -1,wait);
812 THROW_OOP(e());
813 }
814 }
815
816 // Recursively initialize any superinterfaces that declare default methods
817 // Only need to recurse if has_default_methods which includes declaring and
818 // inheriting default methods
819 if (this_k->has_default_methods()) {
820 this_k->initialize_super_interfaces(this_k, CHECK);
821 }
822
823 // Step 8
824 {
825 assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl");
826 JavaThread* jt = (JavaThread*)THREAD;
827 DTRACE_CLASSINIT_PROBE_WAIT(clinit, InstanceKlass::cast(this_k()), -1,wait);
828 // Timer includes any side effects of class initialization (resolution,
829 // etc), but not recursive entry into call_class_initializer().
830 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
831 ClassLoader::perf_class_init_selftime(),
832 ClassLoader::perf_classes_inited(),
833 jt->get_thread_stat()->perf_recursion_counts_addr(),
834 jt->get_thread_stat()->perf_timers_addr(),
835 PerfClassTraceTime::CLASS_CLINIT);
836 this_k->call_class_initializer(THREAD);
837 }
838
839 // Step 9
840 if (!HAS_PENDING_EXCEPTION) {
841 this_k->set_initialization_state_and_notify(fully_initialized, CHECK);
842 { ResourceMark rm(THREAD);
843 debug_only(this_k->vtable()->verify(tty, true);)
844 }
845 }
846 else {
847 // Step 10 and 11
848 Handle e(THREAD, PENDING_EXCEPTION);
849 CLEAR_PENDING_EXCEPTION;
850 // JVMTI has already reported the pending exception
851 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
852 JvmtiExport::clear_detected_exception((JavaThread*)THREAD);
853 {
854 EXCEPTION_MARK;
855 this_k->set_initialization_state_and_notify(initialization_error, THREAD);
856 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below
857 // JVMTI has already reported the pending exception
858 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
859 JvmtiExport::clear_detected_exception((JavaThread*)THREAD);
860 }
861 DTRACE_CLASSINIT_PROBE_WAIT(error, InstanceKlass::cast(this_k()), -1,wait);
862 if (e->is_a(SystemDictionary::Error_klass())) {
863 THROW_OOP(e());
864 } else {
865 JavaCallArguments args(e);
866 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
867 vmSymbols::throwable_void_signature(),
868 &args);
869 }
870 }
871 DTRACE_CLASSINIT_PROBE_WAIT(end, InstanceKlass::cast(this_k()), -1,wait);
872 }
873
874
875 // Note: implementation moved to static method to expose the this pointer.
876 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) {
877 instanceKlassHandle kh(THREAD, this);
878 set_initialization_state_and_notify_impl(kh, state, CHECK);
879 }
880
881 void InstanceKlass::set_initialization_state_and_notify_impl(instanceKlassHandle this_k, ClassState state, TRAPS) {
882 oop init_lock = this_k->init_lock();
883 ObjectLocker ol(init_lock, THREAD, init_lock != NULL);
884 this_k->set_init_state(state);
885 this_k->fence_and_clear_init_lock();
886 ol.notify_all(CHECK);
887 }
888
889 // The embedded _implementor field can only record one implementor.
890 // When there are more than one implementors, the _implementor field
891 // is set to the interface Klass* itself. Following are the possible
892 // values for the _implementor field:
893 // NULL - no implementor
894 // implementor Klass* - one implementor
895 // self - more than one implementor
896 //
897 // The _implementor field only exists for interfaces.
898 void InstanceKlass::add_implementor(Klass* k) {
899 assert(Compile_lock->owned_by_self(), "");
900 assert(is_interface(), "not interface");
901 // Filter out my subinterfaces.
902 // (Note: Interfaces are never on the subklass list.)
903 if (InstanceKlass::cast(k)->is_interface()) return;
904
905 // Filter out subclasses whose supers already implement me.
906 // (Note: CHA must walk subclasses of direct implementors
907 // in order to locate indirect implementors.)
908 Klass* sk = InstanceKlass::cast(k)->super();
909 if (sk != NULL && InstanceKlass::cast(sk)->implements_interface(this))
910 // We only need to check one immediate superclass, since the
911 // implements_interface query looks at transitive_interfaces.
912 // Any supers of the super have the same (or fewer) transitive_interfaces.
913 return;
914
915 Klass* ik = implementor();
916 if (ik == NULL) {
917 set_implementor(k);
918 } else if (ik != this) {
919 // There is already an implementor. Use itself as an indicator of
920 // more than one implementors.
921 set_implementor(this);
922 }
923
924 // The implementor also implements the transitive_interfaces
925 for (int index = 0; index < local_interfaces()->length(); index++) {
926 InstanceKlass::cast(local_interfaces()->at(index))->add_implementor(k);
927 }
928 }
929
930 void InstanceKlass::init_implementor() {
931 if (is_interface()) {
932 set_implementor(NULL);
933 }
934 }
935
936
937 void InstanceKlass::process_interfaces(Thread *thread) {
938 // link this class into the implementors list of every interface it implements
939 for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
940 assert(local_interfaces()->at(i)->is_klass(), "must be a klass");
941 InstanceKlass* interf = InstanceKlass::cast(local_interfaces()->at(i));
942 assert(interf->is_interface(), "expected interface");
943 interf->add_implementor(this);
944 }
945 }
946
947 bool InstanceKlass::can_be_primary_super_slow() const {
948 if (is_interface())
949 return false;
950 else
951 return Klass::can_be_primary_super_slow();
952 }
953
954 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots) {
955 // The secondaries are the implemented interfaces.
956 InstanceKlass* ik = InstanceKlass::cast(this);
957 Array<Klass*>* interfaces = ik->transitive_interfaces();
958 int num_secondaries = num_extra_slots + interfaces->length();
959 if (num_secondaries == 0) {
960 // Must share this for correct bootstrapping!
961 set_secondary_supers(Universe::the_empty_klass_array());
962 return NULL;
963 } else if (num_extra_slots == 0) {
964 // The secondary super list is exactly the same as the transitive interfaces.
965 // Redefine classes has to be careful not to delete this!
966 set_secondary_supers(interfaces);
967 return NULL;
968 } else {
969 // Copy transitive interfaces to a temporary growable array to be constructed
970 // into the secondary super list with extra slots.
971 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length());
972 for (int i = 0; i < interfaces->length(); i++) {
973 secondaries->push(interfaces->at(i));
974 }
975 return secondaries;
976 }
977 }
978
979 bool InstanceKlass::compute_is_subtype_of(Klass* k) {
980 if (k->is_interface()) {
981 return implements_interface(k);
982 } else {
983 return Klass::compute_is_subtype_of(k);
984 }
985 }
986
987 bool InstanceKlass::implements_interface(Klass* k) const {
988 if (this == k) return true;
989 assert(k->is_interface(), "should be an interface class");
990 for (int i = 0; i < transitive_interfaces()->length(); i++) {
991 if (transitive_interfaces()->at(i) == k) {
992 return true;
993 }
994 }
995 return false;
996 }
997
998 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const {
999 // Verify direct super interface
1000 if (this == k) return true;
1001 assert(k->is_interface(), "should be an interface class");
1002 for (int i = 0; i < local_interfaces()->length(); i++) {
1003 if (local_interfaces()->at(i) == k) {
1004 return true;
1005 }
1006 }
1007 return false;
1008 }
1009
1010 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) {
1011 if (length < 0) THROW_0(vmSymbols::java_lang_NegativeArraySizeException());
1012 if (length > arrayOopDesc::max_array_length(T_OBJECT)) {
1013 report_java_out_of_memory("Requested array size exceeds VM limit");
1014 JvmtiExport::post_array_size_exhausted();
1015 THROW_OOP_0(Universe::out_of_memory_error_array_size());
1016 }
1017 int size = objArrayOopDesc::object_size(length);
1018 Klass* ak = array_klass(n, CHECK_NULL);
1019 KlassHandle h_ak (THREAD, ak);
1020 objArrayOop o =
1021 (objArrayOop)CollectedHeap::array_allocate(h_ak, size, length, CHECK_NULL);
1022 return o;
1023 }
1024
1025 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
1026 if (TraceFinalizerRegistration) {
1027 tty->print("Registered ");
1028 i->print_value_on(tty);
1029 tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", p2i(i));
1030 }
1031 instanceHandle h_i(THREAD, i);
1032 // Pass the handle as argument, JavaCalls::call expects oop as jobjects
1033 JavaValue result(T_VOID);
1034 JavaCallArguments args(h_i);
1035 methodHandle mh (THREAD, Universe::finalizer_register_method());
1036 JavaCalls::call(&result, mh, &args, CHECK_NULL);
1037 return h_i();
1038 }
1039
1040 instanceOop InstanceKlass::allocate_instance(TRAPS) {
1041 bool has_finalizer_flag = has_finalizer(); // Query before possible GC
1042 int size = size_helper(); // Query before forming handle.
1043
1044 KlassHandle h_k(THREAD, this);
1045
1046 instanceOop i;
1047
1048 i = (instanceOop)CollectedHeap::obj_allocate(h_k, size, CHECK_NULL);
1049 if (has_finalizer_flag && !RegisterFinalizersAtInit) {
1050 i = register_finalizer(i, CHECK_NULL);
1051 }
1052 return i;
1053 }
1054
1055 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1056 if (is_interface() || is_abstract()) {
1057 ResourceMark rm(THREAD);
1058 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1059 : vmSymbols::java_lang_InstantiationException(), external_name());
1060 }
1061 if (this == SystemDictionary::Class_klass()) {
1062 ResourceMark rm(THREAD);
1063 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1064 : vmSymbols::java_lang_IllegalAccessException(), external_name());
1065 }
1066 }
1067
1068 Klass* InstanceKlass::array_klass_impl(bool or_null, int n, TRAPS) {
1069 instanceKlassHandle this_k(THREAD, this);
1070 return array_klass_impl(this_k, or_null, n, THREAD);
1071 }
1072
1073 Klass* InstanceKlass::array_klass_impl(instanceKlassHandle this_k, bool or_null, int n, TRAPS) {
1074 if (this_k->array_klasses() == NULL) {
1075 if (or_null) return NULL;
1076
1077 ResourceMark rm;
1078 JavaThread *jt = (JavaThread *)THREAD;
1079 {
1080 // Atomic creation of array_klasses
1081 MutexLocker mc(Compile_lock, THREAD); // for vtables
1082 MutexLocker ma(MultiArray_lock, THREAD);
1083
1084 // Check if update has already taken place
1085 if (this_k->array_klasses() == NULL) {
1086 Klass* k = ObjArrayKlass::allocate_objArray_klass(this_k->class_loader_data(), 1, this_k, CHECK_NULL);
1087 this_k->set_array_klasses(k);
1088 }
1089 }
1090 }
1091 // _this will always be set at this point
1092 ObjArrayKlass* oak = (ObjArrayKlass*)this_k->array_klasses();
1093 if (or_null) {
1094 return oak->array_klass_or_null(n);
1095 }
1096 return oak->array_klass(n, THREAD);
1097 }
1098
1099 Klass* InstanceKlass::array_klass_impl(bool or_null, TRAPS) {
1100 return array_klass_impl(or_null, 1, THREAD);
1101 }
1102
1103 void InstanceKlass::call_class_initializer(TRAPS) {
1104 instanceKlassHandle ik (THREAD, this);
1105 call_class_initializer_impl(ik, THREAD);
1106 }
1107
1108 static int call_class_initializer_impl_counter = 0; // for debugging
1109
1110 Method* InstanceKlass::class_initializer() {
1111 Method* clinit = find_method(
1112 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1113 if (clinit != NULL && clinit->has_valid_initializer_flags()) {
1114 return clinit;
1115 }
1116 return NULL;
1117 }
1118
1119 void InstanceKlass::call_class_initializer_impl(instanceKlassHandle this_k, TRAPS) {
1120 if (ReplayCompiles &&
1121 (ReplaySuppressInitializers == 1 ||
1122 ReplaySuppressInitializers >= 2 && this_k->class_loader() != NULL)) {
1123 // Hide the existence of the initializer for the purpose of replaying the compile
1124 return;
1125 }
1126
1127 methodHandle h_method(THREAD, this_k->class_initializer());
1128 assert(!this_k->is_initialized(), "we cannot initialize twice");
1129 if (TraceClassInitialization) {
1130 tty->print("%d Initializing ", call_class_initializer_impl_counter++);
1131 this_k->name()->print_value();
1132 tty->print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", p2i(this_k()));
1133 }
1134 if (h_method() != NULL) {
1135 JavaCallArguments args; // No arguments
1136 JavaValue result(T_VOID);
1137 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1138 }
1139 }
1140
1141
1142 void InstanceKlass::mask_for(methodHandle method, int bci,
1143 InterpreterOopMap* entry_for) {
1144 // Dirty read, then double-check under a lock.
1145 if (_oop_map_cache == NULL) {
1146 // Otherwise, allocate a new one.
1147 MutexLocker x(OopMapCacheAlloc_lock);
1148 // First time use. Allocate a cache in C heap
1149 if (_oop_map_cache == NULL) {
1150 // Release stores from OopMapCache constructor before assignment
1151 // to _oop_map_cache. C++ compilers on ppc do not emit the
1152 // required memory barrier only because of the volatile
1153 // qualifier of _oop_map_cache.
1154 OrderAccess::release_store_ptr(&_oop_map_cache, new OopMapCache());
1155 }
1156 }
1157 // _oop_map_cache is constant after init; lookup below does is own locking.
1158 _oop_map_cache->lookup(method, bci, entry_for);
1159 }
1160
1161
1162 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1163 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1164 Symbol* f_name = fs.name();
1165 Symbol* f_sig = fs.signature();
1166 if (f_name == name && f_sig == sig) {
1167 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1168 return true;
1169 }
1170 }
1171 return false;
1172 }
1173
1174
1175 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1176 const int n = local_interfaces()->length();
1177 for (int i = 0; i < n; i++) {
1178 Klass* intf1 = local_interfaces()->at(i);
1179 assert(intf1->is_interface(), "just checking type");
1180 // search for field in current interface
1181 if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) {
1182 assert(fd->is_static(), "interface field must be static");
1183 return intf1;
1184 }
1185 // search for field in direct superinterfaces
1186 Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd);
1187 if (intf2 != NULL) return intf2;
1188 }
1189 // otherwise field lookup fails
1190 return NULL;
1191 }
1192
1193
1194 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1195 // search order according to newest JVM spec (5.4.3.2, p.167).
1196 // 1) search for field in current klass
1197 if (find_local_field(name, sig, fd)) {
1198 return const_cast<InstanceKlass*>(this);
1199 }
1200 // 2) search for field recursively in direct superinterfaces
1201 { Klass* intf = find_interface_field(name, sig, fd);
1202 if (intf != NULL) return intf;
1203 }
1204 // 3) apply field lookup recursively if superclass exists
1205 { Klass* supr = super();
1206 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, fd);
1207 }
1208 // 4) otherwise field lookup fails
1209 return NULL;
1210 }
1211
1212
1213 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
1214 // search order according to newest JVM spec (5.4.3.2, p.167).
1215 // 1) search for field in current klass
1216 if (find_local_field(name, sig, fd)) {
1217 if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
1218 }
1219 // 2) search for field recursively in direct superinterfaces
1220 if (is_static) {
1221 Klass* intf = find_interface_field(name, sig, fd);
1222 if (intf != NULL) return intf;
1223 }
1224 // 3) apply field lookup recursively if superclass exists
1225 { Klass* supr = super();
1226 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd);
1227 }
1228 // 4) otherwise field lookup fails
1229 return NULL;
1230 }
1231
1232
1233 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1234 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1235 if (fs.offset() == offset) {
1236 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1237 if (fd->is_static() == is_static) return true;
1238 }
1239 }
1240 return false;
1241 }
1242
1243
1244 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1245 Klass* klass = const_cast<InstanceKlass*>(this);
1246 while (klass != NULL) {
1247 if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) {
1248 return true;
1249 }
1250 klass = klass->super();
1251 }
1252 return false;
1253 }
1254
1255
1256 void InstanceKlass::methods_do(void f(Method* method)) {
1257 // Methods aren't stable until they are loaded. This can be read outside
1258 // a lock through the ClassLoaderData for profiling
1259 if (!is_loaded()) {
1260 return;
1261 }
1262
1263 int len = methods()->length();
1264 for (int index = 0; index < len; index++) {
1265 Method* m = methods()->at(index);
1266 assert(m->is_method(), "must be method");
1267 f(m);
1268 }
1269 }
1270
1271
1272 void InstanceKlass::do_local_static_fields(FieldClosure* cl) {
1273 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1274 if (fs.access_flags().is_static()) {
1275 fieldDescriptor& fd = fs.field_descriptor();
1276 cl->do_field(&fd);
1277 }
1278 }
1279 }
1280
1281
1282 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) {
1283 instanceKlassHandle h_this(THREAD, this);
1284 do_local_static_fields_impl(h_this, f, mirror, CHECK);
1285 }
1286
1287
1288 void InstanceKlass::do_local_static_fields_impl(instanceKlassHandle this_k,
1289 void f(fieldDescriptor* fd, Handle, TRAPS), Handle mirror, TRAPS) {
1290 for (JavaFieldStream fs(this_k()); !fs.done(); fs.next()) {
1291 if (fs.access_flags().is_static()) {
1292 fieldDescriptor& fd = fs.field_descriptor();
1293 f(&fd, mirror, CHECK);
1294 }
1295 }
1296 }
1297
1298
1299 static int compare_fields_by_offset(int* a, int* b) {
1300 return a[0] - b[0];
1301 }
1302
1303 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) {
1304 InstanceKlass* super = superklass();
1305 if (super != NULL) {
1306 super->do_nonstatic_fields(cl);
1307 }
1308 fieldDescriptor fd;
1309 int length = java_fields_count();
1310 // In DebugInfo nonstatic fields are sorted by offset.
1311 int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1), mtClass);
1312 int j = 0;
1313 for (int i = 0; i < length; i += 1) {
1314 fd.reinitialize(this, i);
1315 if (!fd.is_static()) {
1316 fields_sorted[j + 0] = fd.offset();
1317 fields_sorted[j + 1] = i;
1318 j += 2;
1319 }
1320 }
1321 if (j > 0) {
1322 length = j;
1323 // _sort_Fn is defined in growableArray.hpp.
1324 qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset);
1325 for (int i = 0; i < length; i += 2) {
1326 fd.reinitialize(this, fields_sorted[i + 1]);
1327 assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields");
1328 cl->do_field(&fd);
1329 }
1330 }
1331 FREE_C_HEAP_ARRAY(int, fields_sorted);
1332 }
1333
1334
1335 void InstanceKlass::array_klasses_do(void f(Klass* k, TRAPS), TRAPS) {
1336 if (array_klasses() != NULL)
1337 ArrayKlass::cast(array_klasses())->array_klasses_do(f, THREAD);
1338 }
1339
1340 void InstanceKlass::array_klasses_do(void f(Klass* k)) {
1341 if (array_klasses() != NULL)
1342 ArrayKlass::cast(array_klasses())->array_klasses_do(f);
1343 }
1344
1345 #ifdef ASSERT
1346 static int linear_search(Array<Method*>* methods, Symbol* name, Symbol* signature) {
1347 int len = methods->length();
1348 for (int index = 0; index < len; index++) {
1349 Method* m = methods->at(index);
1350 assert(m->is_method(), "must be method");
1351 if (m->signature() == signature && m->name() == name) {
1352 return index;
1353 }
1354 }
1355 return -1;
1356 }
1357 #endif
1358
1359 static int binary_search(Array<Method*>* methods, Symbol* name) {
1360 int len = methods->length();
1361 // methods are sorted, so do binary search
1362 int l = 0;
1363 int h = len - 1;
1364 while (l <= h) {
1365 int mid = (l + h) >> 1;
1366 Method* m = methods->at(mid);
1367 assert(m->is_method(), "must be method");
1368 int res = m->name()->fast_compare(name);
1369 if (res == 0) {
1370 return mid;
1371 } else if (res < 0) {
1372 l = mid + 1;
1373 } else {
1374 h = mid - 1;
1375 }
1376 }
1377 return -1;
1378 }
1379
1380 // find_method looks up the name/signature in the local methods array
1381 Method* InstanceKlass::find_method(Symbol* name, Symbol* signature) const {
1382 return find_method_impl(name, signature, find_overpass, find_static, find_private);
1383 }
1384
1385 Method* InstanceKlass::find_method_impl(Symbol* name, Symbol* signature,
1386 OverpassLookupMode overpass_mode,
1387 StaticLookupMode static_mode,
1388 PrivateLookupMode private_mode) const {
1389 return InstanceKlass::find_method_impl(methods(), name, signature, overpass_mode, static_mode, private_mode);
1390 }
1391
1392 // find_instance_method looks up the name/signature in the local methods array
1393 // and skips over static methods
1394 Method* InstanceKlass::find_instance_method(
1395 Array<Method*>* methods, Symbol* name, Symbol* signature) {
1396 Method* meth = InstanceKlass::find_method_impl(methods, name, signature,
1397 find_overpass, skip_static, find_private);
1398 assert(((meth == NULL) || !meth->is_static()), "find_instance_method should have skipped statics");
1399 return meth;
1400 }
1401
1402 // find_instance_method looks up the name/signature in the local methods array
1403 // and skips over static methods
1404 Method* InstanceKlass::find_instance_method(Symbol* name, Symbol* signature) {
1405 return InstanceKlass::find_instance_method(methods(), name, signature);
1406 }
1407
1408 // Find looks up the name/signature in the local methods array
1409 // and filters on the overpass, static and private flags
1410 // This returns the first one found
1411 // note that the local methods array can have up to one overpass, one static
1412 // and one instance (private or not) with the same name/signature
1413 Method* InstanceKlass::find_local_method(Symbol* name, Symbol* signature,
1414 OverpassLookupMode overpass_mode,
1415 StaticLookupMode static_mode,
1416 PrivateLookupMode private_mode) const {
1417 return InstanceKlass::find_method_impl(methods(), name, signature, overpass_mode, static_mode, private_mode);
1418 }
1419
1420 // Find looks up the name/signature in the local methods array
1421 // and filters on the overpass, static and private flags
1422 // This returns the first one found
1423 // note that the local methods array can have up to one overpass, one static
1424 // and one instance (private or not) with the same name/signature
1425 Method* InstanceKlass::find_local_method(Array<Method*>* methods,
1426 Symbol* name, Symbol* signature,
1427 OverpassLookupMode overpass_mode,
1428 StaticLookupMode static_mode,
1429 PrivateLookupMode private_mode) {
1430 return InstanceKlass::find_method_impl(methods, name, signature, overpass_mode, static_mode, private_mode);
1431 }
1432
1433
1434 // find_method looks up the name/signature in the local methods array
1435 Method* InstanceKlass::find_method(
1436 Array<Method*>* methods, Symbol* name, Symbol* signature) {
1437 return InstanceKlass::find_method_impl(methods, name, signature, find_overpass, find_static, find_private);
1438 }
1439
1440 Method* InstanceKlass::find_method_impl(
1441 Array<Method*>* methods, Symbol* name, Symbol* signature,
1442 OverpassLookupMode overpass_mode, StaticLookupMode static_mode,
1443 PrivateLookupMode private_mode) {
1444 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode);
1445 return hit >= 0 ? methods->at(hit): NULL;
1446 }
1447
1448 bool InstanceKlass::method_matches(Method* m, Symbol* signature, bool skipping_overpass, bool skipping_static, bool skipping_private) {
1449 return ((m->signature() == signature) &&
1450 (!skipping_overpass || !m->is_overpass()) &&
1451 (!skipping_static || !m->is_static()) &&
1452 (!skipping_private || !m->is_private()));
1453 }
1454
1455 // Used directly for default_methods to find the index into the
1456 // default_vtable_indices, and indirectly by find_method
1457 // find_method_index looks in the local methods array to return the index
1458 // of the matching name/signature. If, overpass methods are being ignored,
1459 // the search continues to find a potential non-overpass match. This capability
1460 // is important during method resolution to prefer a static method, for example,
1461 // over an overpass method.
1462 // There is the possibility in any _method's array to have the same name/signature
1463 // for a static method, an overpass method and a local instance method
1464 // To correctly catch a given method, the search criteria may need
1465 // to explicitly skip the other two. For local instance methods, it
1466 // is often necessary to skip private methods
1467 int InstanceKlass::find_method_index(
1468 Array<Method*>* methods, Symbol* name, Symbol* signature,
1469 OverpassLookupMode overpass_mode, StaticLookupMode static_mode,
1470 PrivateLookupMode private_mode) {
1471 bool skipping_overpass = (overpass_mode == skip_overpass);
1472 bool skipping_static = (static_mode == skip_static);
1473 bool skipping_private = (private_mode == skip_private);
1474 int hit = binary_search(methods, name);
1475 if (hit != -1) {
1476 Method* m = methods->at(hit);
1477
1478 // Do linear search to find matching signature. First, quick check
1479 // for common case, ignoring overpasses if requested.
1480 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) return hit;
1481
1482 // search downwards through overloaded methods
1483 int i;
1484 for (i = hit - 1; i >= 0; --i) {
1485 Method* m = methods->at(i);
1486 assert(m->is_method(), "must be method");
1487 if (m->name() != name) break;
1488 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) return i;
1489 }
1490 // search upwards
1491 for (i = hit + 1; i < methods->length(); ++i) {
1492 Method* m = methods->at(i);
1493 assert(m->is_method(), "must be method");
1494 if (m->name() != name) break;
1495 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) return i;
1496 }
1497 // not found
1498 #ifdef ASSERT
1499 int index = (skipping_overpass || skipping_static || skipping_private) ? -1 : linear_search(methods, name, signature);
1500 assert(index == -1, "binary search should have found entry %d", index);
1501 #endif
1502 }
1503 return -1;
1504 }
1505 int InstanceKlass::find_method_by_name(Symbol* name, int* end) {
1506 return find_method_by_name(methods(), name, end);
1507 }
1508
1509 int InstanceKlass::find_method_by_name(
1510 Array<Method*>* methods, Symbol* name, int* end_ptr) {
1511 assert(end_ptr != NULL, "just checking");
1512 int start = binary_search(methods, name);
1513 int end = start + 1;
1514 if (start != -1) {
1515 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
1516 while (end < methods->length() && (methods->at(end))->name() == name) ++end;
1517 *end_ptr = end;
1518 return start;
1519 }
1520 return -1;
1521 }
1522
1523 // uncached_lookup_method searches both the local class methods array and all
1524 // superclasses methods arrays, skipping any overpass methods in superclasses.
1525 Method* InstanceKlass::uncached_lookup_method(Symbol* name, Symbol* signature, OverpassLookupMode overpass_mode) const {
1526 OverpassLookupMode overpass_local_mode = overpass_mode;
1527 Klass* klass = const_cast<InstanceKlass*>(this);
1528 while (klass != NULL) {
1529 Method* method = InstanceKlass::cast(klass)->find_method_impl(name, signature, overpass_local_mode, find_static, find_private);
1530 if (method != NULL) {
1531 return method;
1532 }
1533 klass = InstanceKlass::cast(klass)->super();
1534 overpass_local_mode = skip_overpass; // Always ignore overpass methods in superclasses
1535 }
1536 return NULL;
1537 }
1538
1539 #ifdef ASSERT
1540 // search through class hierarchy and return true if this class or
1541 // one of the superclasses was redefined
1542 bool InstanceKlass::has_redefined_this_or_super() const {
1543 const InstanceKlass* klass = this;
1544 while (klass != NULL) {
1545 if (klass->has_been_redefined()) {
1546 return true;
1547 }
1548 klass = InstanceKlass::cast(klass->super());
1549 }
1550 return false;
1551 }
1552 #endif
1553
1554 // lookup a method in the default methods list then in all transitive interfaces
1555 // Do NOT return private or static methods
1556 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
1557 Symbol* signature) const {
1558 Method* m = NULL;
1559 if (default_methods() != NULL) {
1560 m = find_method(default_methods(), name, signature);
1561 }
1562 // Look up interfaces
1563 if (m == NULL) {
1564 m = lookup_method_in_all_interfaces(name, signature, find_defaults);
1565 }
1566 return m;
1567 }
1568
1569 // lookup a method in all the interfaces that this class implements
1570 // Do NOT return private or static methods, new in JDK8 which are not externally visible
1571 // They should only be found in the initial InterfaceMethodRef
1572 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
1573 Symbol* signature,
1574 DefaultsLookupMode defaults_mode) const {
1575 Array<Klass*>* all_ifs = transitive_interfaces();
1576 int num_ifs = all_ifs->length();
1577 InstanceKlass *ik = NULL;
1578 for (int i = 0; i < num_ifs; i++) {
1579 ik = InstanceKlass::cast(all_ifs->at(i));
1580 Method* m = ik->lookup_method(name, signature);
1581 if (m != NULL && m->is_public() && !m->is_static() &&
1582 ((defaults_mode != skip_defaults) || !m->is_default_method())) {
1583 return m;
1584 }
1585 }
1586 return NULL;
1587 }
1588
1589 /* jni_id_for_impl for jfieldIds only */
1590 JNIid* InstanceKlass::jni_id_for_impl(instanceKlassHandle this_k, int offset) {
1591 MutexLocker ml(JfieldIdCreation_lock);
1592 // Retry lookup after we got the lock
1593 JNIid* probe = this_k->jni_ids() == NULL ? NULL : this_k->jni_ids()->find(offset);
1594 if (probe == NULL) {
1595 // Slow case, allocate new static field identifier
1596 probe = new JNIid(this_k(), offset, this_k->jni_ids());
1597 this_k->set_jni_ids(probe);
1598 }
1599 return probe;
1600 }
1601
1602
1603 /* jni_id_for for jfieldIds only */
1604 JNIid* InstanceKlass::jni_id_for(int offset) {
1605 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
1606 if (probe == NULL) {
1607 probe = jni_id_for_impl(this, offset);
1608 }
1609 return probe;
1610 }
1611
1612 u2 InstanceKlass::enclosing_method_data(int offset) {
1613 Array<jushort>* inner_class_list = inner_classes();
1614 if (inner_class_list == NULL) {
1615 return 0;
1616 }
1617 int length = inner_class_list->length();
1618 if (length % inner_class_next_offset == 0) {
1619 return 0;
1620 } else {
1621 int index = length - enclosing_method_attribute_size;
1622 assert(offset < enclosing_method_attribute_size, "invalid offset");
1623 return inner_class_list->at(index + offset);
1624 }
1625 }
1626
1627 void InstanceKlass::set_enclosing_method_indices(u2 class_index,
1628 u2 method_index) {
1629 Array<jushort>* inner_class_list = inner_classes();
1630 assert (inner_class_list != NULL, "_inner_classes list is not set up");
1631 int length = inner_class_list->length();
1632 if (length % inner_class_next_offset == enclosing_method_attribute_size) {
1633 int index = length - enclosing_method_attribute_size;
1634 inner_class_list->at_put(
1635 index + enclosing_method_class_index_offset, class_index);
1636 inner_class_list->at_put(
1637 index + enclosing_method_method_index_offset, method_index);
1638 }
1639 }
1640
1641 // Lookup or create a jmethodID.
1642 // This code is called by the VMThread and JavaThreads so the
1643 // locking has to be done very carefully to avoid deadlocks
1644 // and/or other cache consistency problems.
1645 //
1646 jmethodID InstanceKlass::get_jmethod_id(instanceKlassHandle ik_h, methodHandle method_h) {
1647 size_t idnum = (size_t)method_h->method_idnum();
1648 jmethodID* jmeths = ik_h->methods_jmethod_ids_acquire();
1649 size_t length = 0;
1650 jmethodID id = NULL;
1651
1652 // We use a double-check locking idiom here because this cache is
1653 // performance sensitive. In the normal system, this cache only
1654 // transitions from NULL to non-NULL which is safe because we use
1655 // release_set_methods_jmethod_ids() to advertise the new cache.
1656 // A partially constructed cache should never be seen by a racing
1657 // thread. We also use release_store_ptr() to save a new jmethodID
1658 // in the cache so a partially constructed jmethodID should never be
1659 // seen either. Cache reads of existing jmethodIDs proceed without a
1660 // lock, but cache writes of a new jmethodID requires uniqueness and
1661 // creation of the cache itself requires no leaks so a lock is
1662 // generally acquired in those two cases.
1663 //
1664 // If the RedefineClasses() API has been used, then this cache can
1665 // grow and we'll have transitions from non-NULL to bigger non-NULL.
1666 // Cache creation requires no leaks and we require safety between all
1667 // cache accesses and freeing of the old cache so a lock is generally
1668 // acquired when the RedefineClasses() API has been used.
1669
1670 if (jmeths != NULL) {
1671 // the cache already exists
1672 if (!ik_h->idnum_can_increment()) {
1673 // the cache can't grow so we can just get the current values
1674 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
1675 } else {
1676 // cache can grow so we have to be more careful
1677 if (Threads::number_of_threads() == 0 ||
1678 SafepointSynchronize::is_at_safepoint()) {
1679 // we're single threaded or at a safepoint - no locking needed
1680 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
1681 } else {
1682 MutexLocker ml(JmethodIdCreation_lock);
1683 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
1684 }
1685 }
1686 }
1687 // implied else:
1688 // we need to allocate a cache so default length and id values are good
1689
1690 if (jmeths == NULL || // no cache yet
1691 length <= idnum || // cache is too short
1692 id == NULL) { // cache doesn't contain entry
1693
1694 // This function can be called by the VMThread so we have to do all
1695 // things that might block on a safepoint before grabbing the lock.
1696 // Otherwise, we can deadlock with the VMThread or have a cache
1697 // consistency issue. These vars keep track of what we might have
1698 // to free after the lock is dropped.
1699 jmethodID to_dealloc_id = NULL;
1700 jmethodID* to_dealloc_jmeths = NULL;
1701
1702 // may not allocate new_jmeths or use it if we allocate it
1703 jmethodID* new_jmeths = NULL;
1704 if (length <= idnum) {
1705 // allocate a new cache that might be used
1706 size_t size = MAX2(idnum+1, (size_t)ik_h->idnum_allocated_count());
1707 new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1, mtClass);
1708 memset(new_jmeths, 0, (size+1)*sizeof(jmethodID));
1709 // cache size is stored in element[0], other elements offset by one
1710 new_jmeths[0] = (jmethodID)size;
1711 }
1712
1713 // allocate a new jmethodID that might be used
1714 jmethodID new_id = NULL;
1715 if (method_h->is_old() && !method_h->is_obsolete()) {
1716 // The method passed in is old (but not obsolete), we need to use the current version
1717 Method* current_method = ik_h->method_with_idnum((int)idnum);
1718 assert(current_method != NULL, "old and but not obsolete, so should exist");
1719 new_id = Method::make_jmethod_id(ik_h->class_loader_data(), current_method);
1720 } else {
1721 // It is the current version of the method or an obsolete method,
1722 // use the version passed in
1723 new_id = Method::make_jmethod_id(ik_h->class_loader_data(), method_h());
1724 }
1725
1726 if (Threads::number_of_threads() == 0 ||
1727 SafepointSynchronize::is_at_safepoint()) {
1728 // we're single threaded or at a safepoint - no locking needed
1729 id = get_jmethod_id_fetch_or_update(ik_h, idnum, new_id, new_jmeths,
1730 &to_dealloc_id, &to_dealloc_jmeths);
1731 } else {
1732 MutexLocker ml(JmethodIdCreation_lock);
1733 id = get_jmethod_id_fetch_or_update(ik_h, idnum, new_id, new_jmeths,
1734 &to_dealloc_id, &to_dealloc_jmeths);
1735 }
1736
1737 // The lock has been dropped so we can free resources.
1738 // Free up either the old cache or the new cache if we allocated one.
1739 if (to_dealloc_jmeths != NULL) {
1740 FreeHeap(to_dealloc_jmeths);
1741 }
1742 // free up the new ID since it wasn't needed
1743 if (to_dealloc_id != NULL) {
1744 Method::destroy_jmethod_id(ik_h->class_loader_data(), to_dealloc_id);
1745 }
1746 }
1747 return id;
1748 }
1749
1750 // Figure out how many jmethodIDs haven't been allocated, and make
1751 // sure space for them is pre-allocated. This makes getting all
1752 // method ids much, much faster with classes with more than 8
1753 // methods, and has a *substantial* effect on performance with jvmti
1754 // code that loads all jmethodIDs for all classes.
1755 void InstanceKlass::ensure_space_for_methodids(int start_offset) {
1756 int new_jmeths = 0;
1757 int length = methods()->length();
1758 for (int index = start_offset; index < length; index++) {
1759 Method* m = methods()->at(index);
1760 jmethodID id = m->find_jmethod_id_or_null();
1761 if (id == NULL) {
1762 new_jmeths++;
1763 }
1764 }
1765 if (new_jmeths != 0) {
1766 Method::ensure_jmethod_ids(class_loader_data(), new_jmeths);
1767 }
1768 }
1769
1770 // Common code to fetch the jmethodID from the cache or update the
1771 // cache with the new jmethodID. This function should never do anything
1772 // that causes the caller to go to a safepoint or we can deadlock with
1773 // the VMThread or have cache consistency issues.
1774 //
1775 jmethodID InstanceKlass::get_jmethod_id_fetch_or_update(
1776 instanceKlassHandle ik_h, size_t idnum, jmethodID new_id,
1777 jmethodID* new_jmeths, jmethodID* to_dealloc_id_p,
1778 jmethodID** to_dealloc_jmeths_p) {
1779 assert(new_id != NULL, "sanity check");
1780 assert(to_dealloc_id_p != NULL, "sanity check");
1781 assert(to_dealloc_jmeths_p != NULL, "sanity check");
1782 assert(Threads::number_of_threads() == 0 ||
1783 SafepointSynchronize::is_at_safepoint() ||
1784 JmethodIdCreation_lock->owned_by_self(), "sanity check");
1785
1786 // reacquire the cache - we are locked, single threaded or at a safepoint
1787 jmethodID* jmeths = ik_h->methods_jmethod_ids_acquire();
1788 jmethodID id = NULL;
1789 size_t length = 0;
1790
1791 if (jmeths == NULL || // no cache yet
1792 (length = (size_t)jmeths[0]) <= idnum) { // cache is too short
1793 if (jmeths != NULL) {
1794 // copy any existing entries from the old cache
1795 for (size_t index = 0; index < length; index++) {
1796 new_jmeths[index+1] = jmeths[index+1];
1797 }
1798 *to_dealloc_jmeths_p = jmeths; // save old cache for later delete
1799 }
1800 ik_h->release_set_methods_jmethod_ids(jmeths = new_jmeths);
1801 } else {
1802 // fetch jmethodID (if any) from the existing cache
1803 id = jmeths[idnum+1];
1804 *to_dealloc_jmeths_p = new_jmeths; // save new cache for later delete
1805 }
1806 if (id == NULL) {
1807 // No matching jmethodID in the existing cache or we have a new
1808 // cache or we just grew the cache. This cache write is done here
1809 // by the first thread to win the foot race because a jmethodID
1810 // needs to be unique once it is generally available.
1811 id = new_id;
1812
1813 // The jmethodID cache can be read while unlocked so we have to
1814 // make sure the new jmethodID is complete before installing it
1815 // in the cache.
1816 OrderAccess::release_store_ptr(&jmeths[idnum+1], id);
1817 } else {
1818 *to_dealloc_id_p = new_id; // save new id for later delete
1819 }
1820 return id;
1821 }
1822
1823
1824 // Common code to get the jmethodID cache length and the jmethodID
1825 // value at index idnum if there is one.
1826 //
1827 void InstanceKlass::get_jmethod_id_length_value(jmethodID* cache,
1828 size_t idnum, size_t *length_p, jmethodID* id_p) {
1829 assert(cache != NULL, "sanity check");
1830 assert(length_p != NULL, "sanity check");
1831 assert(id_p != NULL, "sanity check");
1832
1833 // cache size is stored in element[0], other elements offset by one
1834 *length_p = (size_t)cache[0];
1835 if (*length_p <= idnum) { // cache is too short
1836 *id_p = NULL;
1837 } else {
1838 *id_p = cache[idnum+1]; // fetch jmethodID (if any)
1839 }
1840 }
1841
1842
1843 // Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles
1844 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
1845 size_t idnum = (size_t)method->method_idnum();
1846 jmethodID* jmeths = methods_jmethod_ids_acquire();
1847 size_t length; // length assigned as debugging crumb
1848 jmethodID id = NULL;
1849 if (jmeths != NULL && // If there is a cache
1850 (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough,
1851 id = jmeths[idnum+1]; // Look up the id (may be NULL)
1852 }
1853 return id;
1854 }
1855
1856 int nmethodBucket::decrement() {
1857 return Atomic::add(-1, (volatile int *)&_count);
1858 }
1859
1860 //
1861 // Walk the list of dependent nmethods searching for nmethods which
1862 // are dependent on the changes that were passed in and mark them for
1863 // deoptimization. Returns the number of nmethods found.
1864 //
1865 int DependencyContext::mark_dependent_nmethods(DepChange& changes) {
1866 int found = 0;
1867 for (nmethodBucket* b = dependencies(); b != NULL; b = b->next()) {
1868 nmethod* nm = b->get_nmethod();
1869 // since dependencies aren't removed until an nmethod becomes a zombie,
1870 // the dependency list may contain nmethods which aren't alive.
1871 if (b->count() > 0 && nm->is_alive() && !nm->is_marked_for_deoptimization() && nm->check_dependency_on(changes)) {
1872 if (TraceDependencies) {
1873 ResourceMark rm;
1874 tty->print_cr("Marked for deoptimization");
1875 changes.print();
1876 nm->print();
1877 nm->print_dependencies();
1878 }
1879 nm->mark_for_deoptimization();
1880 found++;
1881 }
1882 }
1883 return found;
1884 }
1885
1886 //
1887 // Add an nmethod to the dependency context.
1888 // It's possible that an nmethod has multiple dependencies on this klass
1889 // so a count is kept for each bucket to guarantee that creation and
1890 // deletion of dependencies is consistent. Returns new head of the list.
1891 //
1892 void DependencyContext::add_dependent_nmethod(nmethod* nm, bool expunge) {
1893 assert_lock_strong(CodeCache_lock);
1894 for (nmethodBucket* b = dependencies(); b != NULL; b = b->next()) {
1895 if (nm == b->get_nmethod()) {
1896 b->increment();
1897 return;
1898 }
1899 }
1900 set_dependencies(new nmethodBucket(nm, dependencies()));
1901
1902 if (expunge) {
1903 // Remove stale entries from the list.
1904 expunge_stale_entries();
1905 }
1906 }
1907
1908 //
1909 // Decrement count of the nmethod in the dependency list and, optionally, remove
1910 // the bucket completely when the count goes to 0. This method must find
1911 // a corresponding bucket otherwise there's a bug in the recording of dependencies.
1912 void DependencyContext::remove_dependent_nmethod(nmethod* nm, bool expunge) {
1913 assert_locked_or_safepoint(CodeCache_lock);
1914 nmethodBucket* first = dependencies();
1915 nmethodBucket* last = NULL;
1916 for (nmethodBucket* b = first; b != NULL; b = b->next()) {
1917 if (nm == b->get_nmethod()) {
1918 int val = b->decrement();
1919 guarantee(val >= 0, "Underflow: %d", val);
1920 if (val == 0) {
1921 if (expunge) {
1922 if (last == NULL) {
1923 set_dependencies(b->next());
1924 } else {
1925 last->set_next(b->next());
1926 }
1927 delete b;
1928 } else {
1929 set_has_stale_entries(true);
1930 }
1931 }
1932 if (expunge) {
1933 // Remove stale entries from the list.
1934 expunge_stale_entries();
1935 }
1936 return;
1937 }
1938 last = b;
1939 }
1940 #ifdef ASSERT
1941 tty->print_raw_cr("### can't find dependent nmethod");
1942 nm->print();
1943 #endif // ASSERT
1944 ShouldNotReachHere();
1945 }
1946
1947 //
1948 // Reclaim all unused buckets.
1949 //
1950 void DependencyContext::expunge_stale_entries() {
1951 assert_locked_or_safepoint(CodeCache_lock);
1952 if (!has_stale_entries()) {
1953 assert(!find_stale_entries(), "inconsistent info");
1954 return;
1955 }
1956 nmethodBucket* first = dependencies();
1957 nmethodBucket* last = NULL;
1958 for (nmethodBucket* b = first; b != NULL;) {
1959 assert(b->count() >= 0, "bucket count: %d", b->count());
1960 nmethodBucket* next = b->next();
1961 if (b->count() == 0) {
1962 if (last == NULL) {
1963 first = next;
1964 } else {
1965 last->set_next(next);
1966 }
1967 delete b;
1968 // last stays the same.
1969 } else {
1970 last = b;
1971 }
1972 b = next;
1973 }
1974 set_dependencies(first);
1975 set_has_stale_entries(false);
1976 }
1977
1978 int DependencyContext::remove_all_dependents() {
1979 //assert_lock_strong(CodeCache_lock); // called from InstanceKlass::release_C_heap_structures()
1980 nmethodBucket* b = dependencies();
1981 set_dependencies(NULL);
1982 int marked = 0;
1983 while (b != NULL) {
1984 nmethod* nm = b->get_nmethod();
1985 if (b->count() > 0 && nm->is_alive() && !nm->is_marked_for_deoptimization()) {
1986 nm->mark_for_deoptimization();
1987 marked++;
1988 }
1989 nmethodBucket* next = b->next();
1990 delete b;
1991 b = next;
1992 }
1993 set_has_stale_entries(false);
1994 return marked;
1995 }
1996
1997 #ifndef PRODUCT
1998 void DependencyContext::print_dependent_nmethods(bool verbose) {
1999 int idx = 0;
2000 for (nmethodBucket* b = dependencies(); b != NULL; b = b->next()) {
2001 nmethod* nm = b->get_nmethod();
2002 tty->print("[%d] count=%d { ", idx++, b->count());
2003 if (!verbose) {
2004 nm->print_on(tty, "nmethod");
2005 tty->print_cr(" } ");
2006 } else {
2007 nm->print();
2008 nm->print_dependencies();
2009 tty->print_cr("--- } ");
2010 }
2011 }
2012 }
2013
2014 bool DependencyContext::is_dependent_nmethod(nmethod* nm) {
2015 for (nmethodBucket* b = dependencies(); b != NULL; b = b->next()) {
2016 if (nm == b->get_nmethod()) {
2017 #ifdef ASSERT
2018 int count = b->count();
2019 assert(count >= 0, "count shouldn't be negative: %d", count);
2020 #endif
2021 return true;
2022 }
2023 }
2024 return false;
2025 }
2026
2027 bool DependencyContext::find_stale_entries() {
2028 for (nmethodBucket* b = dependencies(); b != NULL; b = b->next()) {
2029 if (b->count() == 0) return true;
2030 }
2031 return false;
2032 }
2033
2034 #endif //PRODUCT
2035
2036 int InstanceKlass::mark_dependent_nmethods(DepChange& changes) {
2037 DependencyContext dep_context(&_dep_context);
2038 return dep_context.mark_dependent_nmethods(changes);
2039 }
2040
2041 void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
2042 DependencyContext dep_context(&_dep_context);
2043 dep_context.add_dependent_nmethod(nm);
2044 }
2045
2046 void InstanceKlass::remove_dependent_nmethod(nmethod* nm, bool delete_immediately) {
2047 DependencyContext dep_context(&_dep_context);
2048 dep_context.remove_dependent_nmethod(nm, delete_immediately);
2049 }
2050
2051 #ifndef PRODUCT
2052 void InstanceKlass::print_dependent_nmethods(bool verbose) {
2053 DependencyContext dep_context(&_dep_context);
2054 dep_context.print_dependent_nmethods(verbose);
2055 }
2056
2057 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
2058 DependencyContext dep_context(&_dep_context);
2059 return dep_context.is_dependent_nmethod(nm);
2060 }
2061 #endif //PRODUCT
2062
2063 void InstanceKlass::clean_weak_instanceklass_links(BoolObjectClosure* is_alive) {
2064 clean_implementors_list(is_alive);
2065 clean_method_data(is_alive);
2066
2067 // Since GC iterates InstanceKlasses sequentially, it is safe to remove stale entries here.
2068 DependencyContext dep_context(&_dep_context);
2069 dep_context.expunge_stale_entries();
2070 }
2071
2072 void InstanceKlass::clean_implementors_list(BoolObjectClosure* is_alive) {
2073 assert(class_loader_data()->is_alive(is_alive), "this klass should be live");
2074 if (is_interface()) {
2075 if (ClassUnloading) {
2076 Klass* impl = implementor();
2077 if (impl != NULL) {
2078 if (!impl->is_loader_alive(is_alive)) {
2079 // remove this guy
2080 Klass** klass = adr_implementor();
2081 assert(klass != NULL, "null klass");
2082 if (klass != NULL) {
2083 *klass = NULL;
2084 }
2085 }
2086 }
2087 }
2088 }
2089 }
2090
2091 void InstanceKlass::clean_method_data(BoolObjectClosure* is_alive) {
2092 for (int m = 0; m < methods()->length(); m++) {
2093 MethodData* mdo = methods()->at(m)->method_data();
2094 if (mdo != NULL) {
2095 mdo->clean_method_data(is_alive);
2096 }
2097 }
2098 }
2099
2100
2101 static void remove_unshareable_in_class(Klass* k) {
2102 // remove klass's unshareable info
2103 k->remove_unshareable_info();
2104 }
2105
2106 void InstanceKlass::remove_unshareable_info() {
2107 Klass::remove_unshareable_info();
2108 // Unlink the class
2109 if (is_linked()) {
2110 unlink_class();
2111 }
2112 init_implementor();
2113
2114 constants()->remove_unshareable_info();
2115
2116 assert(_dep_context == DependencyContext::EMPTY, "dependency context is not shareable");
2117
2118 for (int i = 0; i < methods()->length(); i++) {
2119 Method* m = methods()->at(i);
2120 m->remove_unshareable_info();
2121 }
2122
2123 // do array classes also.
2124 array_klasses_do(remove_unshareable_in_class);
2125 }
2126
2127 static void restore_unshareable_in_class(Klass* k, TRAPS) {
2128 // Array classes have null protection domain.
2129 // --> see ArrayKlass::complete_create_array_klass()
2130 k->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
2131 }
2132
2133 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) {
2134 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
2135 instanceKlassHandle ik(THREAD, this);
2136
2137 Array<Method*>* methods = ik->methods();
2138 int num_methods = methods->length();
2139 for (int index2 = 0; index2 < num_methods; ++index2) {
2140 methodHandle m(THREAD, methods->at(index2));
2141 m->restore_unshareable_info(CHECK);
2142 }
2143 if (JvmtiExport::has_redefined_a_class()) {
2144 // Reinitialize vtable because RedefineClasses may have changed some
2145 // entries in this vtable for super classes so the CDS vtable might
2146 // point to old or obsolete entries. RedefineClasses doesn't fix up
2147 // vtables in the shared system dictionary, only the main one.
2148 // It also redefines the itable too so fix that too.
2149 ResourceMark rm(THREAD);
2150 ik->vtable()->initialize_vtable(false, CHECK);
2151 ik->itable()->initialize_itable(false, CHECK);
2152 }
2153
2154 // restore constant pool resolved references
2155 ik->constants()->restore_unshareable_info(CHECK);
2156
2157 ik->array_klasses_do(restore_unshareable_in_class, CHECK);
2158 }
2159
2160 // returns true IFF is_in_error_state() has been changed as a result of this call.
2161 bool InstanceKlass::check_sharing_error_state() {
2162 assert(DumpSharedSpaces, "should only be called during dumping");
2163 bool old_state = is_in_error_state();
2164
2165 if (!is_in_error_state()) {
2166 bool bad = false;
2167 for (InstanceKlass* sup = java_super(); sup; sup = sup->java_super()) {
2168 if (sup->is_in_error_state()) {
2169 bad = true;
2170 break;
2171 }
2172 }
2173 if (!bad) {
2174 Array<Klass*>* interfaces = transitive_interfaces();
2175 for (int i = 0; i < interfaces->length(); i++) {
2176 Klass* iface = interfaces->at(i);
2177 if (InstanceKlass::cast(iface)->is_in_error_state()) {
2178 bad = true;
2179 break;
2180 }
2181 }
2182 }
2183
2184 if (bad) {
2185 set_in_error_state();
2186 }
2187 }
2188
2189 return (old_state != is_in_error_state());
2190 }
2191
2192 static void clear_all_breakpoints(Method* m) {
2193 m->clear_all_breakpoints();
2194 }
2195
2196
2197 void InstanceKlass::notify_unload_class(InstanceKlass* ik) {
2198 // notify the debugger
2199 if (JvmtiExport::should_post_class_unload()) {
2200 JvmtiExport::post_class_unload(ik);
2201 }
2202
2203 // notify ClassLoadingService of class unload
2204 ClassLoadingService::notify_class_unloaded(ik);
2205 }
2206
2207 void InstanceKlass::release_C_heap_structures(InstanceKlass* ik) {
2208 // Clean up C heap
2209 ik->release_C_heap_structures();
2210 ik->constants()->release_C_heap_structures();
2211 }
2212
2213 void InstanceKlass::release_C_heap_structures() {
2214
2215 // Can't release the constant pool here because the constant pool can be
2216 // deallocated separately from the InstanceKlass for default methods and
2217 // redefine classes.
2218
2219 // Deallocate oop map cache
2220 if (_oop_map_cache != NULL) {
2221 delete _oop_map_cache;
2222 _oop_map_cache = NULL;
2223 }
2224
2225 // Deallocate JNI identifiers for jfieldIDs
2226 JNIid::deallocate(jni_ids());
2227 set_jni_ids(NULL);
2228
2229 jmethodID* jmeths = methods_jmethod_ids_acquire();
2230 if (jmeths != (jmethodID*)NULL) {
2231 release_set_methods_jmethod_ids(NULL);
2232 FreeHeap(jmeths);
2233 }
2234
2235 // Deallocate MemberNameTable
2236 {
2237 Mutex* lock_or_null = SafepointSynchronize::is_at_safepoint() ? NULL : MemberNameTable_lock;
2238 MutexLockerEx ml(lock_or_null, Mutex::_no_safepoint_check_flag);
2239 MemberNameTable* mnt = member_names();
2240 if (mnt != NULL) {
2241 delete mnt;
2242 set_member_names(NULL);
2243 }
2244 }
2245
2246 // release dependencies
2247 {
2248 DependencyContext ctx(&_dep_context);
2249 int marked = ctx.remove_all_dependents();
2250 assert(marked == 0, "all dependencies should be already invalidated");
2251 }
2252
2253 // Deallocate breakpoint records
2254 if (breakpoints() != 0x0) {
2255 methods_do(clear_all_breakpoints);
2256 assert(breakpoints() == 0x0, "should have cleared breakpoints");
2257 }
2258
2259 // deallocate the cached class file
2260 if (_cached_class_file != NULL) {
2261 os::free(_cached_class_file);
2262 _cached_class_file = NULL;
2263 }
2264
2265 // Decrement symbol reference counts associated with the unloaded class.
2266 if (_name != NULL) _name->decrement_refcount();
2267 // unreference array name derived from this class name (arrays of an unloaded
2268 // class can't be referenced anymore).
2269 if (_array_name != NULL) _array_name->decrement_refcount();
2270 if (_source_debug_extension != NULL) FREE_C_HEAP_ARRAY(char, _source_debug_extension);
2271
2272 assert(_total_instanceKlass_count >= 1, "Sanity check");
2273 Atomic::dec(&_total_instanceKlass_count);
2274 }
2275
2276 void InstanceKlass::set_source_debug_extension(char* array, int length) {
2277 if (array == NULL) {
2278 _source_debug_extension = NULL;
2279 } else {
2280 // Adding one to the attribute length in order to store a null terminator
2281 // character could cause an overflow because the attribute length is
2282 // already coded with an u4 in the classfile, but in practice, it's
2283 // unlikely to happen.
2284 assert((length+1) > length, "Overflow checking");
2285 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
2286 for (int i = 0; i < length; i++) {
2287 sde[i] = array[i];
2288 }
2289 sde[length] = '\0';
2290 _source_debug_extension = sde;
2291 }
2292 }
2293
2294 address InstanceKlass::static_field_addr(int offset) {
2295 return (address)(offset + InstanceMirrorKlass::offset_of_static_fields() + cast_from_oop<intptr_t>(java_mirror()));
2296 }
2297
2298
2299 const char* InstanceKlass::signature_name() const {
2300 int hash_len = 0;
2301 char hash_buf[40];
2302
2303 // If this is an anonymous class, append a hash to make the name unique
2304 if (is_anonymous()) {
2305 intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0;
2306 jio_snprintf(hash_buf, sizeof(hash_buf), "/" UINTX_FORMAT, (uintx)hash);
2307 hash_len = (int)strlen(hash_buf);
2308 }
2309
2310 // Get the internal name as a c string
2311 const char* src = (const char*) (name()->as_C_string());
2312 const int src_length = (int)strlen(src);
2313
2314 char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3);
2315
2316 // Add L as type indicator
2317 int dest_index = 0;
2318 dest[dest_index++] = 'L';
2319
2320 // Add the actual class name
2321 for (int src_index = 0; src_index < src_length; ) {
2322 dest[dest_index++] = src[src_index++];
2323 }
2324
2325 // If we have a hash, append it
2326 for (int hash_index = 0; hash_index < hash_len; ) {
2327 dest[dest_index++] = hash_buf[hash_index++];
2328 }
2329
2330 // Add the semicolon and the NULL
2331 dest[dest_index++] = ';';
2332 dest[dest_index] = '\0';
2333 return dest;
2334 }
2335
2336 // different verisons of is_same_class_package
2337 bool InstanceKlass::is_same_class_package(Klass* class2) {
2338 Klass* class1 = this;
2339 oop classloader1 = InstanceKlass::cast(class1)->class_loader();
2340 Symbol* classname1 = class1->name();
2341
2342 if (class2->oop_is_objArray()) {
2343 class2 = ObjArrayKlass::cast(class2)->bottom_klass();
2344 }
2345 oop classloader2;
2346 if (class2->oop_is_instance()) {
2347 classloader2 = InstanceKlass::cast(class2)->class_loader();
2348 } else {
2349 assert(class2->oop_is_typeArray(), "should be type array");
2350 classloader2 = NULL;
2351 }
2352 Symbol* classname2 = class2->name();
2353
2354 return InstanceKlass::is_same_class_package(classloader1, classname1,
2355 classloader2, classname2);
2356 }
2357
2358 bool InstanceKlass::is_same_class_package(oop classloader2, Symbol* classname2) {
2359 Klass* class1 = this;
2360 oop classloader1 = InstanceKlass::cast(class1)->class_loader();
2361 Symbol* classname1 = class1->name();
2362
2363 return InstanceKlass::is_same_class_package(classloader1, classname1,
2364 classloader2, classname2);
2365 }
2366
2367 // return true if two classes are in the same package, classloader
2368 // and classname information is enough to determine a class's package
2369 bool InstanceKlass::is_same_class_package(oop class_loader1, Symbol* class_name1,
2370 oop class_loader2, Symbol* class_name2) {
2371 if (class_loader1 != class_loader2) {
2372 return false;
2373 } else if (class_name1 == class_name2) {
2374 return true; // skip painful bytewise comparison
2375 } else {
2376 ResourceMark rm;
2377
2378 // The Symbol*'s are in UTF8 encoding. Since we only need to check explicitly
2379 // for ASCII characters ('/', 'L', '['), we can keep them in UTF8 encoding.
2380 // Otherwise, we just compare jbyte values between the strings.
2381 const jbyte *name1 = class_name1->base();
2382 const jbyte *name2 = class_name2->base();
2383
2384 const jbyte *last_slash1 = UTF8::strrchr(name1, class_name1->utf8_length(), '/');
2385 const jbyte *last_slash2 = UTF8::strrchr(name2, class_name2->utf8_length(), '/');
2386
2387 if ((last_slash1 == NULL) || (last_slash2 == NULL)) {
2388 // One of the two doesn't have a package. Only return true
2389 // if the other one also doesn't have a package.
2390 return last_slash1 == last_slash2;
2391 } else {
2392 // Skip over '['s
2393 if (*name1 == '[') {
2394 do {
2395 name1++;
2396 } while (*name1 == '[');
2397 if (*name1 != 'L') {
2398 // Something is terribly wrong. Shouldn't be here.
2399 return false;
2400 }
2401 }
2402 if (*name2 == '[') {
2403 do {
2404 name2++;
2405 } while (*name2 == '[');
2406 if (*name2 != 'L') {
2407 // Something is terribly wrong. Shouldn't be here.
2408 return false;
2409 }
2410 }
2411
2412 // Check that package part is identical
2413 int length1 = last_slash1 - name1;
2414 int length2 = last_slash2 - name2;
2415
2416 return UTF8::equal(name1, length1, name2, length2);
2417 }
2418 }
2419 }
2420
2421 // Returns true iff super_method can be overridden by a method in targetclassname
2422 // See JSL 3rd edition 8.4.6.1
2423 // Assumes name-signature match
2424 // "this" is InstanceKlass of super_method which must exist
2425 // note that the InstanceKlass of the method in the targetclassname has not always been created yet
2426 bool InstanceKlass::is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) {
2427 // Private methods can not be overridden
2428 if (super_method->is_private()) {
2429 return false;
2430 }
2431 // If super method is accessible, then override
2432 if ((super_method->is_protected()) ||
2433 (super_method->is_public())) {
2434 return true;
2435 }
2436 // Package-private methods are not inherited outside of package
2437 assert(super_method->is_package_private(), "must be package private");
2438 return(is_same_class_package(targetclassloader(), targetclassname));
2439 }
2440
2441 /* defined for now in jvm.cpp, for historical reasons *--
2442 Klass* InstanceKlass::compute_enclosing_class_impl(instanceKlassHandle self,
2443 Symbol*& simple_name_result, TRAPS) {
2444 ...
2445 }
2446 */
2447
2448 // tell if two classes have the same enclosing class (at package level)
2449 bool InstanceKlass::is_same_package_member_impl(instanceKlassHandle class1,
2450 Klass* class2_oop, TRAPS) {
2451 if (class2_oop == class1()) return true;
2452 if (!class2_oop->oop_is_instance()) return false;
2453 instanceKlassHandle class2(THREAD, class2_oop);
2454
2455 // must be in same package before we try anything else
2456 if (!class1->is_same_class_package(class2->class_loader(), class2->name()))
2457 return false;
2458
2459 // As long as there is an outer1.getEnclosingClass,
2460 // shift the search outward.
2461 instanceKlassHandle outer1 = class1;
2462 for (;;) {
2463 // As we walk along, look for equalities between outer1 and class2.
2464 // Eventually, the walks will terminate as outer1 stops
2465 // at the top-level class around the original class.
2466 bool ignore_inner_is_member;
2467 Klass* next = outer1->compute_enclosing_class(&ignore_inner_is_member,
2468 CHECK_false);
2469 if (next == NULL) break;
2470 if (next == class2()) return true;
2471 outer1 = instanceKlassHandle(THREAD, next);
2472 }
2473
2474 // Now do the same for class2.
2475 instanceKlassHandle outer2 = class2;
2476 for (;;) {
2477 bool ignore_inner_is_member;
2478 Klass* next = outer2->compute_enclosing_class(&ignore_inner_is_member,
2479 CHECK_false);
2480 if (next == NULL) break;
2481 // Might as well check the new outer against all available values.
2482 if (next == class1()) return true;
2483 if (next == outer1()) return true;
2484 outer2 = instanceKlassHandle(THREAD, next);
2485 }
2486
2487 // If by this point we have not found an equality between the
2488 // two classes, we know they are in separate package members.
2489 return false;
2490 }
2491
2492 bool InstanceKlass::find_inner_classes_attr(instanceKlassHandle k, int* ooff, int* noff, TRAPS) {
2493 constantPoolHandle i_cp(THREAD, k->constants());
2494 for (InnerClassesIterator iter(k); !iter.done(); iter.next()) {
2495 int ioff = iter.inner_class_info_index();
2496 if (ioff != 0) {
2497 // Check to see if the name matches the class we're looking for
2498 // before attempting to find the class.
2499 if (i_cp->klass_name_at_matches(k, ioff)) {
2500 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false);
2501 if (k() == inner_klass) {
2502 *ooff = iter.outer_class_info_index();
2503 *noff = iter.inner_name_index();
2504 return true;
2505 }
2506 }
2507 }
2508 }
2509 return false;
2510 }
2511
2512 Klass* InstanceKlass::compute_enclosing_class_impl(instanceKlassHandle k, bool* inner_is_member, TRAPS) {
2513 instanceKlassHandle outer_klass;
2514 *inner_is_member = false;
2515 int ooff = 0, noff = 0;
2516 if (find_inner_classes_attr(k, &ooff, &noff, THREAD)) {
2517 constantPoolHandle i_cp(THREAD, k->constants());
2518 if (ooff != 0) {
2519 Klass* ok = i_cp->klass_at(ooff, CHECK_NULL);
2520 outer_klass = instanceKlassHandle(THREAD, ok);
2521 *inner_is_member = true;
2522 }
2523 if (outer_klass.is_null()) {
2524 // It may be anonymous; try for that.
2525 int encl_method_class_idx = k->enclosing_method_class_index();
2526 if (encl_method_class_idx != 0) {
2527 Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
2528 outer_klass = instanceKlassHandle(THREAD, ok);
2529 *inner_is_member = false;
2530 }
2531 }
2532 }
2533
2534 // If no inner class attribute found for this class.
2535 if (outer_klass.is_null()) return NULL;
2536
2537 // Throws an exception if outer klass has not declared k as an inner klass
2538 // We need evidence that each klass knows about the other, or else
2539 // the system could allow a spoof of an inner class to gain access rights.
2540 Reflection::check_for_inner_class(outer_klass, k, *inner_is_member, CHECK_NULL);
2541 return outer_klass();
2542 }
2543
2544 jint InstanceKlass::compute_modifier_flags(TRAPS) const {
2545 jint access = access_flags().as_int();
2546
2547 // But check if it happens to be member class.
2548 instanceKlassHandle ik(THREAD, this);
2549 InnerClassesIterator iter(ik);
2550 for (; !iter.done(); iter.next()) {
2551 int ioff = iter.inner_class_info_index();
2552 // Inner class attribute can be zero, skip it.
2553 // Strange but true: JVM spec. allows null inner class refs.
2554 if (ioff == 0) continue;
2555
2556 // only look at classes that are already loaded
2557 // since we are looking for the flags for our self.
2558 Symbol* inner_name = ik->constants()->klass_name_at(ioff);
2559 if ((ik->name() == inner_name)) {
2560 // This is really a member class.
2561 access = iter.inner_access_flags();
2562 break;
2563 }
2564 }
2565 // Remember to strip ACC_SUPER bit
2566 return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS;
2567 }
2568
2569 jint InstanceKlass::jvmti_class_status() const {
2570 jint result = 0;
2571
2572 if (is_linked()) {
2573 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
2574 }
2575
2576 if (is_initialized()) {
2577 assert(is_linked(), "Class status is not consistent");
2578 result |= JVMTI_CLASS_STATUS_INITIALIZED;
2579 }
2580 if (is_in_error_state()) {
2581 result |= JVMTI_CLASS_STATUS_ERROR;
2582 }
2583 return result;
2584 }
2585
2586 Method* InstanceKlass::method_at_itable(Klass* holder, int index, TRAPS) {
2587 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2588 int method_table_offset_in_words = ioe->offset()/wordSize;
2589 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
2590 / itableOffsetEntry::size();
2591
2592 for (int cnt = 0 ; ; cnt ++, ioe ++) {
2593 // If the interface isn't implemented by the receiver class,
2594 // the VM should throw IncompatibleClassChangeError.
2595 if (cnt >= nof_interfaces) {
2596 THROW_NULL(vmSymbols::java_lang_IncompatibleClassChangeError());
2597 }
2598
2599 Klass* ik = ioe->interface_klass();
2600 if (ik == holder) break;
2601 }
2602
2603 itableMethodEntry* ime = ioe->first_method_entry(this);
2604 Method* m = ime[index].method();
2605 if (m == NULL) {
2606 THROW_NULL(vmSymbols::java_lang_AbstractMethodError());
2607 }
2608 return m;
2609 }
2610
2611
2612 #if INCLUDE_JVMTI
2613 // update default_methods for redefineclasses for methods that are
2614 // not yet in the vtable due to concurrent subclass define and superinterface
2615 // redefinition
2616 // Note: those in the vtable, should have been updated via adjust_method_entries
2617 void InstanceKlass::adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed) {
2618 // search the default_methods for uses of either obsolete or EMCP methods
2619 if (default_methods() != NULL) {
2620 for (int index = 0; index < default_methods()->length(); index ++) {
2621 Method* old_method = default_methods()->at(index);
2622 if (old_method == NULL || old_method->method_holder() != holder || !old_method->is_old()) {
2623 continue; // skip uninteresting entries
2624 }
2625 assert(!old_method->is_deleted(), "default methods may not be deleted");
2626
2627 Method* new_method = holder->method_with_idnum(old_method->orig_method_idnum());
2628
2629 assert(new_method != NULL, "method_with_idnum() should not be NULL");
2630 assert(old_method != new_method, "sanity check");
2631
2632 default_methods()->at_put(index, new_method);
2633 if (RC_TRACE_IN_RANGE(0x00100000, 0x00400000)) {
2634 if (!(*trace_name_printed)) {
2635 // RC_TRACE_MESG macro has an embedded ResourceMark
2636 RC_TRACE_MESG(("adjust: klassname=%s default methods from name=%s",
2637 external_name(),
2638 old_method->method_holder()->external_name()));
2639 *trace_name_printed = true;
2640 }
2641 RC_TRACE(0x00100000, ("default method update: %s(%s) ",
2642 new_method->name()->as_C_string(),
2643 new_method->signature()->as_C_string()));
2644 }
2645 }
2646 }
2647 }
2648 #endif // INCLUDE_JVMTI
2649
2650 // On-stack replacement stuff
2651 void InstanceKlass::add_osr_nmethod(nmethod* n) {
2652 // only one compilation can be active
2653 {
2654 // This is a short non-blocking critical region, so the no safepoint check is ok.
2655 MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
2656 assert(n->is_osr_method(), "wrong kind of nmethod");
2657 n->set_osr_link(osr_nmethods_head());
2658 set_osr_nmethods_head(n);
2659 // Raise the highest osr level if necessary
2660 if (TieredCompilation) {
2661 Method* m = n->method();
2662 m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level()));
2663 }
2664 }
2665
2666 // Get rid of the osr methods for the same bci that have lower levels.
2667 if (TieredCompilation) {
2668 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) {
2669 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true);
2670 if (inv != NULL && inv->is_in_use()) {
2671 inv->make_not_entrant();
2672 }
2673 }
2674 }
2675 }
2676
2677
2678 void InstanceKlass::remove_osr_nmethod(nmethod* n) {
2679 // This is a short non-blocking critical region, so the no safepoint check is ok.
2680 MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
2681 assert(n->is_osr_method(), "wrong kind of nmethod");
2682 nmethod* last = NULL;
2683 nmethod* cur = osr_nmethods_head();
2684 int max_level = CompLevel_none; // Find the max comp level excluding n
2685 Method* m = n->method();
2686 // Search for match
2687 while(cur != NULL && cur != n) {
2688 if (TieredCompilation && m == cur->method()) {
2689 // Find max level before n
2690 max_level = MAX2(max_level, cur->comp_level());
2691 }
2692 last = cur;
2693 cur = cur->osr_link();
2694 }
2695 nmethod* next = NULL;
2696 if (cur == n) {
2697 next = cur->osr_link();
2698 if (last == NULL) {
2699 // Remove first element
2700 set_osr_nmethods_head(next);
2701 } else {
2702 last->set_osr_link(next);
2703 }
2704 }
2705 n->set_osr_link(NULL);
2706 if (TieredCompilation) {
2707 cur = next;
2708 while (cur != NULL) {
2709 // Find max level after n
2710 if (m == cur->method()) {
2711 max_level = MAX2(max_level, cur->comp_level());
2712 }
2713 cur = cur->osr_link();
2714 }
2715 m->set_highest_osr_comp_level(max_level);
2716 }
2717 }
2718
2719 int InstanceKlass::mark_osr_nmethods(const Method* m) {
2720 // This is a short non-blocking critical region, so the no safepoint check is ok.
2721 MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
2722 nmethod* osr = osr_nmethods_head();
2723 int found = 0;
2724 while (osr != NULL) {
2725 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
2726 if (osr->method() == m) {
2727 osr->mark_for_deoptimization();
2728 found++;
2729 }
2730 osr = osr->osr_link();
2731 }
2732 return found;
2733 }
2734
2735 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
2736 // This is a short non-blocking critical region, so the no safepoint check is ok.
2737 MutexLockerEx ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
2738 nmethod* osr = osr_nmethods_head();
2739 nmethod* best = NULL;
2740 while (osr != NULL) {
2741 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
2742 // There can be a time when a c1 osr method exists but we are waiting
2743 // for a c2 version. When c2 completes its osr nmethod we will trash
2744 // the c1 version and only be able to find the c2 version. However
2745 // while we overflow in the c1 code at back branches we don't want to
2746 // try and switch to the same code as we are already running
2747
2748 if (osr->method() == m &&
2749 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
2750 if (match_level) {
2751 if (osr->comp_level() == comp_level) {
2752 // Found a match - return it.
2753 return osr;
2754 }
2755 } else {
2756 if (best == NULL || (osr->comp_level() > best->comp_level())) {
2757 if (osr->comp_level() == CompLevel_highest_tier) {
2758 // Found the best possible - return it.
2759 return osr;
2760 }
2761 best = osr;
2762 }
2763 }
2764 }
2765 osr = osr->osr_link();
2766 }
2767 if (best != NULL && best->comp_level() >= comp_level && match_level == false) {
2768 return best;
2769 }
2770 return NULL;
2771 }
2772
2773 bool InstanceKlass::add_member_name(Handle mem_name) {
2774 jweak mem_name_wref = JNIHandles::make_weak_global(mem_name);
2775 MutexLocker ml(MemberNameTable_lock);
2776 DEBUG_ONLY(No_Safepoint_Verifier nsv);
2777
2778 // Check if method has been redefined while taking out MemberNameTable_lock, if so
2779 // return false. We cannot cache obsolete methods. They will crash when the function
2780 // is called!
2781 Method* method = (Method*)java_lang_invoke_MemberName::vmtarget(mem_name());
2782 if (method->is_obsolete()) {
2783 return false;
2784 } else if (method->is_old()) {
2785 // Replace method with redefined version
2786 java_lang_invoke_MemberName::set_vmtarget(mem_name(), method_with_idnum(method->method_idnum()));
2787 }
2788
2789 if (_member_names == NULL) {
2790 _member_names = new (ResourceObj::C_HEAP, mtClass) MemberNameTable(idnum_allocated_count());
2791 }
2792 _member_names->add_member_name(mem_name_wref);
2793 return true;
2794 }
2795
2796 // -----------------------------------------------------------------------------------------------------
2797 // Printing
2798
2799 #ifndef PRODUCT
2800
2801 #define BULLET " - "
2802
2803 static const char* state_names[] = {
2804 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
2805 };
2806
2807 static void print_vtable(intptr_t* start, int len, outputStream* st) {
2808 for (int i = 0; i < len; i++) {
2809 intptr_t e = start[i];
2810 st->print("%d : " INTPTR_FORMAT, i, e);
2811 if (e != 0 && ((Metadata*)e)->is_metaspace_object()) {
2812 st->print(" ");
2813 ((Metadata*)e)->print_value_on(st);
2814 }
2815 st->cr();
2816 }
2817 }
2818
2819 void InstanceKlass::print_on(outputStream* st) const {
2820 assert(is_klass(), "must be klass");
2821 Klass::print_on(st);
2822
2823 st->print(BULLET"instance size: %d", size_helper()); st->cr();
2824 st->print(BULLET"klass size: %d", size()); st->cr();
2825 st->print(BULLET"access: "); access_flags().print_on(st); st->cr();
2826 st->print(BULLET"state: "); st->print_cr("%s", state_names[_init_state]);
2827 st->print(BULLET"name: "); name()->print_value_on(st); st->cr();
2828 st->print(BULLET"super: "); super()->print_value_on_maybe_null(st); st->cr();
2829 st->print(BULLET"sub: ");
2830 Klass* sub = subklass();
2831 int n;
2832 for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) {
2833 if (n < MaxSubklassPrintSize) {
2834 sub->print_value_on(st);
2835 st->print(" ");
2836 }
2837 }
2838 if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize);
2839 st->cr();
2840
2841 if (is_interface()) {
2842 st->print_cr(BULLET"nof implementors: %d", nof_implementors());
2843 if (nof_implementors() == 1) {
2844 st->print_cr(BULLET"implementor: ");
2845 st->print(" ");
2846 implementor()->print_value_on(st);
2847 st->cr();
2848 }
2849 }
2850
2851 st->print(BULLET"arrays: "); array_klasses()->print_value_on_maybe_null(st); st->cr();
2852 st->print(BULLET"methods: "); methods()->print_value_on(st); st->cr();
2853 if (Verbose || WizardMode) {
2854 Array<Method*>* method_array = methods();
2855 for (int i = 0; i < method_array->length(); i++) {
2856 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
2857 }
2858 }
2859 st->print(BULLET"method ordering: "); method_ordering()->print_value_on(st); st->cr();
2860 st->print(BULLET"default_methods: "); default_methods()->print_value_on(st); st->cr();
2861 if (Verbose && default_methods() != NULL) {
2862 Array<Method*>* method_array = default_methods();
2863 for (int i = 0; i < method_array->length(); i++) {
2864 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
2865 }
2866 }
2867 if (default_vtable_indices() != NULL) {
2868 st->print(BULLET"default vtable indices: "); default_vtable_indices()->print_value_on(st); st->cr();
2869 }
2870 st->print(BULLET"local interfaces: "); local_interfaces()->print_value_on(st); st->cr();
2871 st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr();
2872 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr();
2873 if (class_loader_data() != NULL) {
2874 st->print(BULLET"class loader data: ");
2875 class_loader_data()->print_value_on(st);
2876 st->cr();
2877 }
2878 st->print(BULLET"host class: "); host_klass()->print_value_on_maybe_null(st); st->cr();
2879 if (source_file_name() != NULL) {
2880 st->print(BULLET"source file: ");
2881 source_file_name()->print_value_on(st);
2882 st->cr();
2883 }
2884 if (source_debug_extension() != NULL) {
2885 st->print(BULLET"source debug extension: ");
2886 st->print("%s", source_debug_extension());
2887 st->cr();
2888 }
2889 st->print(BULLET"class annotations: "); class_annotations()->print_value_on(st); st->cr();
2890 st->print(BULLET"class type annotations: "); class_type_annotations()->print_value_on(st); st->cr();
2891 st->print(BULLET"field annotations: "); fields_annotations()->print_value_on(st); st->cr();
2892 st->print(BULLET"field type annotations: "); fields_type_annotations()->print_value_on(st); st->cr();
2893 {
2894 bool have_pv = false;
2895 // previous versions are linked together through the InstanceKlass
2896 for (InstanceKlass* pv_node = _previous_versions;
2897 pv_node != NULL;
2898 pv_node = pv_node->previous_versions()) {
2899 if (!have_pv)
2900 st->print(BULLET"previous version: ");
2901 have_pv = true;
2902 pv_node->constants()->print_value_on(st);
2903 }
2904 if (have_pv) st->cr();
2905 }
2906
2907 if (generic_signature() != NULL) {
2908 st->print(BULLET"generic signature: ");
2909 generic_signature()->print_value_on(st);
2910 st->cr();
2911 }
2912 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr();
2913 st->print(BULLET"java mirror: "); java_mirror()->print_value_on(st); st->cr();
2914 st->print(BULLET"vtable length %d (start addr: " INTPTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
2915 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st);
2916 st->print(BULLET"itable length %d (start addr: " INTPTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
2917 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_itable(), itable_length(), st);
2918 st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
2919 FieldPrinter print_static_field(st);
2920 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
2921 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
2922 FieldPrinter print_nonstatic_field(st);
2923 ((InstanceKlass*)this)->do_nonstatic_fields(&print_nonstatic_field);
2924
2925 st->print(BULLET"non-static oop maps: ");
2926 OopMapBlock* map = start_of_nonstatic_oop_maps();
2927 OopMapBlock* end_map = map + nonstatic_oop_map_count();
2928 while (map < end_map) {
2929 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
2930 map++;
2931 }
2932 st->cr();
2933 }
2934
2935 #endif //PRODUCT
2936
2937 void InstanceKlass::print_value_on(outputStream* st) const {
2938 assert(is_klass(), "must be klass");
2939 if (Verbose || WizardMode) access_flags().print_on(st);
2940 name()->print_value_on(st);
2941 }
2942
2943 #ifndef PRODUCT
2944
2945 void FieldPrinter::do_field(fieldDescriptor* fd) {
2946 _st->print(BULLET);
2947 if (_obj == NULL) {
2948 fd->print_on(_st);
2949 _st->cr();
2950 } else {
2951 fd->print_on_for(_st, _obj);
2952 _st->cr();
2953 }
2954 }
2955
2956
2957 void InstanceKlass::oop_print_on(oop obj, outputStream* st) {
2958 Klass::oop_print_on(obj, st);
2959
2960 if (this == SystemDictionary::String_klass()) {
2961 typeArrayOop value = java_lang_String::value(obj);
2962 juint offset = java_lang_String::offset(obj);
2963 juint length = java_lang_String::length(obj);
2964 if (value != NULL &&
2965 value->is_typeArray() &&
2966 offset <= (juint) value->length() &&
2967 offset + length <= (juint) value->length()) {
2968 st->print(BULLET"string: ");
2969 java_lang_String::print(obj, st);
2970 st->cr();
2971 if (!WizardMode) return; // that is enough
2972 }
2973 }
2974
2975 st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj));
2976 FieldPrinter print_field(st, obj);
2977 do_nonstatic_fields(&print_field);
2978
2979 if (this == SystemDictionary::Class_klass()) {
2980 st->print(BULLET"signature: ");
2981 java_lang_Class::print_signature(obj, st);
2982 st->cr();
2983 Klass* mirrored_klass = java_lang_Class::as_Klass(obj);
2984 st->print(BULLET"fake entry for mirror: ");
2985 mirrored_klass->print_value_on_maybe_null(st);
2986 st->cr();
2987 Klass* array_klass = java_lang_Class::array_klass(obj);
2988 st->print(BULLET"fake entry for array: ");
2989 array_klass->print_value_on_maybe_null(st);
2990 st->cr();
2991 st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj));
2992 st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj));
2993 Klass* real_klass = java_lang_Class::as_Klass(obj);
2994 if (real_klass != NULL && real_klass->oop_is_instance()) {
2995 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
2996 }
2997 } else if (this == SystemDictionary::MethodType_klass()) {
2998 st->print(BULLET"signature: ");
2999 java_lang_invoke_MethodType::print_signature(obj, st);
3000 st->cr();
3001 }
3002 }
3003
3004 #endif //PRODUCT
3005
3006 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
3007 st->print("a ");
3008 name()->print_value_on(st);
3009 obj->print_address_on(st);
3010 if (this == SystemDictionary::String_klass()
3011 && java_lang_String::value(obj) != NULL) {
3012 ResourceMark rm;
3013 int len = java_lang_String::length(obj);
3014 int plen = (len < 24 ? len : 12);
3015 char* str = java_lang_String::as_utf8_string(obj, 0, plen);
3016 st->print(" = \"%s\"", str);
3017 if (len > plen)
3018 st->print("...[%d]", len);
3019 } else if (this == SystemDictionary::Class_klass()) {
3020 Klass* k = java_lang_Class::as_Klass(obj);
3021 st->print(" = ");
3022 if (k != NULL) {
3023 k->print_value_on(st);
3024 } else {
3025 const char* tname = type2name(java_lang_Class::primitive_type(obj));
3026 st->print("%s", tname ? tname : "type?");
3027 }
3028 } else if (this == SystemDictionary::MethodType_klass()) {
3029 st->print(" = ");
3030 java_lang_invoke_MethodType::print_signature(obj, st);
3031 } else if (java_lang_boxing_object::is_instance(obj)) {
3032 st->print(" = ");
3033 java_lang_boxing_object::print(obj, st);
3034 } else if (this == SystemDictionary::LambdaForm_klass()) {
3035 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
3036 if (vmentry != NULL) {
3037 st->print(" => ");
3038 vmentry->print_value_on(st);
3039 }
3040 } else if (this == SystemDictionary::MemberName_klass()) {
3041 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
3042 if (vmtarget != NULL) {
3043 st->print(" = ");
3044 vmtarget->print_value_on(st);
3045 } else {
3046 java_lang_invoke_MemberName::clazz(obj)->print_value_on(st);
3047 st->print(".");
3048 java_lang_invoke_MemberName::name(obj)->print_value_on(st);
3049 }
3050 }
3051 }
3052
3053 const char* InstanceKlass::internal_name() const {
3054 return external_name();
3055 }
3056
3057 #if INCLUDE_SERVICES
3058 // Size Statistics
3059 void InstanceKlass::collect_statistics(KlassSizeStats *sz) const {
3060 Klass::collect_statistics(sz);
3061
3062 sz->_inst_size = HeapWordSize * size_helper();
3063 sz->_vtab_bytes = HeapWordSize * align_object_offset(vtable_length());
3064 sz->_itab_bytes = HeapWordSize * align_object_offset(itable_length());
3065 sz->_nonstatic_oopmap_bytes = HeapWordSize *
3066 ((is_interface() || is_anonymous()) ?
3067 align_object_offset(nonstatic_oop_map_size()) :
3068 nonstatic_oop_map_size());
3069
3070 int n = 0;
3071 n += (sz->_methods_array_bytes = sz->count_array(methods()));
3072 n += (sz->_method_ordering_bytes = sz->count_array(method_ordering()));
3073 n += (sz->_local_interfaces_bytes = sz->count_array(local_interfaces()));
3074 n += (sz->_transitive_interfaces_bytes = sz->count_array(transitive_interfaces()));
3075 n += (sz->_fields_bytes = sz->count_array(fields()));
3076 n += (sz->_inner_classes_bytes = sz->count_array(inner_classes()));
3077 sz->_ro_bytes += n;
3078
3079 const ConstantPool* cp = constants();
3080 if (cp) {
3081 cp->collect_statistics(sz);
3082 }
3083
3084 const Annotations* anno = annotations();
3085 if (anno) {
3086 anno->collect_statistics(sz);
3087 }
3088
3089 const Array<Method*>* methods_array = methods();
3090 if (methods()) {
3091 for (int i = 0; i < methods_array->length(); i++) {
3092 Method* method = methods_array->at(i);
3093 if (method) {
3094 sz->_method_count ++;
3095 method->collect_statistics(sz);
3096 }
3097 }
3098 }
3099 }
3100 #endif // INCLUDE_SERVICES
3101
3102 // Verification
3103
3104 class VerifyFieldClosure: public OopClosure {
3105 protected:
3106 template <class T> void do_oop_work(T* p) {
3107 oop obj = oopDesc::load_decode_heap_oop(p);
3108 if (!obj->is_oop_or_null()) {
3109 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj));
3110 Universe::print();
3111 guarantee(false, "boom");
3112 }
3113 }
3114 public:
3115 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); }
3116 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
3117 };
3118
3119 void InstanceKlass::verify_on(outputStream* st) {
3120 #ifndef PRODUCT
3121 // Avoid redundant verifies, this really should be in product.
3122 if (_verify_count == Universe::verify_count()) return;
3123 _verify_count = Universe::verify_count();
3124 #endif
3125
3126 // Verify Klass
3127 Klass::verify_on(st);
3128
3129 // Verify that klass is present in ClassLoaderData
3130 guarantee(class_loader_data()->contains_klass(this),
3131 "this class isn't found in class loader data");
3132
3133 // Verify vtables
3134 if (is_linked()) {
3135 ResourceMark rm;
3136 // $$$ This used to be done only for m/s collections. Doing it
3137 // always seemed a valid generalization. (DLD -- 6/00)
3138 vtable()->verify(st);
3139 }
3140
3141 // Verify first subklass
3142 if (subklass() != NULL) {
3143 guarantee(subklass()->is_klass(), "should be klass");
3144 }
3145
3146 // Verify siblings
3147 Klass* super = this->super();
3148 Klass* sib = next_sibling();
3149 if (sib != NULL) {
3150 if (sib == this) {
3151 fatal("subclass points to itself " PTR_FORMAT, p2i(sib));
3152 }
3153
3154 guarantee(sib->is_klass(), "should be klass");
3155 guarantee(sib->super() == super, "siblings should have same superklass");
3156 }
3157
3158 // Verify implementor fields
3159 Klass* im = implementor();
3160 if (im != NULL) {
3161 guarantee(is_interface(), "only interfaces should have implementor set");
3162 guarantee(im->is_klass(), "should be klass");
3163 guarantee(!im->is_interface() || im == this,
3164 "implementors cannot be interfaces");
3165 }
3166
3167 // Verify local interfaces
3168 if (local_interfaces()) {
3169 Array<Klass*>* local_interfaces = this->local_interfaces();
3170 for (int j = 0; j < local_interfaces->length(); j++) {
3171 Klass* e = local_interfaces->at(j);
3172 guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
3173 }
3174 }
3175
3176 // Verify transitive interfaces
3177 if (transitive_interfaces() != NULL) {
3178 Array<Klass*>* transitive_interfaces = this->transitive_interfaces();
3179 for (int j = 0; j < transitive_interfaces->length(); j++) {
3180 Klass* e = transitive_interfaces->at(j);
3181 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
3182 }
3183 }
3184
3185 // Verify methods
3186 if (methods() != NULL) {
3187 Array<Method*>* methods = this->methods();
3188 for (int j = 0; j < methods->length(); j++) {
3189 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3190 }
3191 for (int j = 0; j < methods->length() - 1; j++) {
3192 Method* m1 = methods->at(j);
3193 Method* m2 = methods->at(j + 1);
3194 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3195 }
3196 }
3197
3198 // Verify method ordering
3199 if (method_ordering() != NULL) {
3200 Array<int>* method_ordering = this->method_ordering();
3201 int length = method_ordering->length();
3202 if (JvmtiExport::can_maintain_original_method_order() ||
3203 ((UseSharedSpaces || DumpSharedSpaces) && length != 0)) {
3204 guarantee(length == methods()->length(), "invalid method ordering length");
3205 jlong sum = 0;
3206 for (int j = 0; j < length; j++) {
3207 int original_index = method_ordering->at(j);
3208 guarantee(original_index >= 0, "invalid method ordering index");
3209 guarantee(original_index < length, "invalid method ordering index");
3210 sum += original_index;
3211 }
3212 // Verify sum of indices 0,1,...,length-1
3213 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
3214 } else {
3215 guarantee(length == 0, "invalid method ordering length");
3216 }
3217 }
3218
3219 // Verify default methods
3220 if (default_methods() != NULL) {
3221 Array<Method*>* methods = this->default_methods();
3222 for (int j = 0; j < methods->length(); j++) {
3223 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3224 }
3225 for (int j = 0; j < methods->length() - 1; j++) {
3226 Method* m1 = methods->at(j);
3227 Method* m2 = methods->at(j + 1);
3228 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3229 }
3230 }
3231
3232 // Verify JNI static field identifiers
3233 if (jni_ids() != NULL) {
3234 jni_ids()->verify(this);
3235 }
3236
3237 // Verify other fields
3238 if (array_klasses() != NULL) {
3239 guarantee(array_klasses()->is_klass(), "should be klass");
3240 }
3241 if (constants() != NULL) {
3242 guarantee(constants()->is_constantPool(), "should be constant pool");
3243 }
3244 const Klass* host = host_klass();
3245 if (host != NULL) {
3246 guarantee(host->is_klass(), "should be klass");
3247 }
3248 }
3249
3250 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
3251 Klass::oop_verify_on(obj, st);
3252 VerifyFieldClosure blk;
3253 obj->oop_iterate_no_header(&blk);
3254 }
3255
3256
3257 // JNIid class for jfieldIDs only
3258 // Note to reviewers:
3259 // These JNI functions are just moved over to column 1 and not changed
3260 // in the compressed oops workspace.
3261 JNIid::JNIid(Klass* holder, int offset, JNIid* next) {
3262 _holder = holder;
3263 _offset = offset;
3264 _next = next;
3265 debug_only(_is_static_field_id = false;)
3266 }
3267
3268
3269 JNIid* JNIid::find(int offset) {
3270 JNIid* current = this;
3271 while (current != NULL) {
3272 if (current->offset() == offset) return current;
3273 current = current->next();
3274 }
3275 return NULL;
3276 }
3277
3278 void JNIid::deallocate(JNIid* current) {
3279 while (current != NULL) {
3280 JNIid* next = current->next();
3281 delete current;
3282 current = next;
3283 }
3284 }
3285
3286
3287 void JNIid::verify(Klass* holder) {
3288 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields();
3289 int end_field_offset;
3290 end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize);
3291
3292 JNIid* current = this;
3293 while (current != NULL) {
3294 guarantee(current->holder() == holder, "Invalid klass in JNIid");
3295 #ifdef ASSERT
3296 int o = current->offset();
3297 if (current->is_static_field_id()) {
3298 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid");
3299 }
3300 #endif
3301 current = current->next();
3302 }
3303 }
3304
3305
3306 #ifdef ASSERT
3307 void InstanceKlass::set_init_state(ClassState state) {
3308 bool good_state = is_shared() ? (_init_state <= state)
3309 : (_init_state < state);
3310 assert(good_state || state == allocated, "illegal state transition");
3311 _init_state = (u1)state;
3312 }
3313 #endif
3314
3315
3316
3317 // RedefineClasses() support for previous versions:
3318 int InstanceKlass::_previous_version_count = 0;
3319
3320 // Purge previous versions before adding new previous versions of the class.
3321 void InstanceKlass::purge_previous_versions(InstanceKlass* ik) {
3322 if (ik->previous_versions() != NULL) {
3323 // This klass has previous versions so see what we can cleanup
3324 // while it is safe to do so.
3325
3326 int deleted_count = 0; // leave debugging breadcrumbs
3327 int live_count = 0;
3328 ClassLoaderData* loader_data = ik->class_loader_data();
3329 assert(loader_data != NULL, "should never be null");
3330
3331 // RC_TRACE macro has an embedded ResourceMark
3332 RC_TRACE(0x00000200, ("purge: %s: previous versions", ik->external_name()));
3333
3334 // previous versions are linked together through the InstanceKlass
3335 InstanceKlass* pv_node = ik->previous_versions();
3336 InstanceKlass* last = ik;
3337 int version = 0;
3338
3339 // check the previous versions list
3340 for (; pv_node != NULL; ) {
3341
3342 ConstantPool* pvcp = pv_node->constants();
3343 assert(pvcp != NULL, "cp ref was unexpectedly cleared");
3344
3345 if (!pvcp->on_stack()) {
3346 // If the constant pool isn't on stack, none of the methods
3347 // are executing. Unlink this previous_version.
3348 // The previous version InstanceKlass is on the ClassLoaderData deallocate list
3349 // so will be deallocated during the next phase of class unloading.
3350 RC_TRACE(0x00000200, ("purge: previous version " INTPTR_FORMAT " is dead",
3351 p2i(pv_node)));
3352 // For debugging purposes.
3353 pv_node->set_is_scratch_class();
3354 pv_node->class_loader_data()->add_to_deallocate_list(pv_node);
3355 pv_node = pv_node->previous_versions();
3356 last->link_previous_versions(pv_node);
3357 deleted_count++;
3358 version++;
3359 continue;
3360 } else {
3361 RC_TRACE(0x00000200, ("purge: previous version " INTPTR_FORMAT " is alive",
3362 p2i(pv_node)));
3363 assert(pvcp->pool_holder() != NULL, "Constant pool with no holder");
3364 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
3365 live_count++;
3366 }
3367
3368 // At least one method is live in this previous version.
3369 // Reset dead EMCP methods not to get breakpoints.
3370 // All methods are deallocated when all of the methods for this class are no
3371 // longer running.
3372 Array<Method*>* method_refs = pv_node->methods();
3373 if (method_refs != NULL) {
3374 RC_TRACE(0x00000200, ("purge: previous methods length=%d",
3375 method_refs->length()));
3376 for (int j = 0; j < method_refs->length(); j++) {
3377 Method* method = method_refs->at(j);
3378
3379 if (!method->on_stack()) {
3380 // no breakpoints for non-running methods
3381 if (method->is_running_emcp()) {
3382 method->set_running_emcp(false);
3383 }
3384 } else {
3385 assert (method->is_obsolete() || method->is_running_emcp(),
3386 "emcp method cannot run after emcp bit is cleared");
3387 // RC_TRACE macro has an embedded ResourceMark
3388 RC_TRACE(0x00000200,
3389 ("purge: %s(%s): prev method @%d in version @%d is alive",
3390 method->name()->as_C_string(),
3391 method->signature()->as_C_string(), j, version));
3392 }
3393 }
3394 }
3395 // next previous version
3396 last = pv_node;
3397 pv_node = pv_node->previous_versions();
3398 version++;
3399 }
3400 RC_TRACE(0x00000200,
3401 ("purge: previous version stats: live=%d, deleted=%d", live_count,
3402 deleted_count));
3403 }
3404 }
3405
3406 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods,
3407 int emcp_method_count) {
3408 int obsolete_method_count = old_methods->length() - emcp_method_count;
3409
3410 if (emcp_method_count != 0 && obsolete_method_count != 0 &&
3411 _previous_versions != NULL) {
3412 // We have a mix of obsolete and EMCP methods so we have to
3413 // clear out any matching EMCP method entries the hard way.
3414 int local_count = 0;
3415 for (int i = 0; i < old_methods->length(); i++) {
3416 Method* old_method = old_methods->at(i);
3417 if (old_method->is_obsolete()) {
3418 // only obsolete methods are interesting
3419 Symbol* m_name = old_method->name();
3420 Symbol* m_signature = old_method->signature();
3421
3422 // previous versions are linked together through the InstanceKlass
3423 int j = 0;
3424 for (InstanceKlass* prev_version = _previous_versions;
3425 prev_version != NULL;
3426 prev_version = prev_version->previous_versions(), j++) {
3427
3428 Array<Method*>* method_refs = prev_version->methods();
3429 for (int k = 0; k < method_refs->length(); k++) {
3430 Method* method = method_refs->at(k);
3431
3432 if (!method->is_obsolete() &&
3433 method->name() == m_name &&
3434 method->signature() == m_signature) {
3435 // The current RedefineClasses() call has made all EMCP
3436 // versions of this method obsolete so mark it as obsolete
3437 RC_TRACE(0x00000400,
3438 ("add: %s(%s): flush obsolete method @%d in version @%d",
3439 m_name->as_C_string(), m_signature->as_C_string(), k, j));
3440
3441 method->set_is_obsolete();
3442 break;
3443 }
3444 }
3445
3446 // The previous loop may not find a matching EMCP method, but
3447 // that doesn't mean that we can optimize and not go any
3448 // further back in the PreviousVersion generations. The EMCP
3449 // method for this generation could have already been made obsolete,
3450 // but there still may be an older EMCP method that has not
3451 // been made obsolete.
3452 }
3453
3454 if (++local_count >= obsolete_method_count) {
3455 // no more obsolete methods so bail out now
3456 break;
3457 }
3458 }
3459 }
3460 }
3461 }
3462
3463 // Save the scratch_class as the previous version if any of the methods are running.
3464 // The previous_versions are used to set breakpoints in EMCP methods and they are
3465 // also used to clean MethodData links to redefined methods that are no longer running.
3466 void InstanceKlass::add_previous_version(instanceKlassHandle scratch_class,
3467 int emcp_method_count) {
3468 assert(Thread::current()->is_VM_thread(),
3469 "only VMThread can add previous versions");
3470
3471 // RC_TRACE macro has an embedded ResourceMark
3472 RC_TRACE(0x00000400, ("adding previous version ref for %s, EMCP_cnt=%d",
3473 scratch_class->external_name(), emcp_method_count));
3474
3475 // Clean out old previous versions
3476 purge_previous_versions(this);
3477
3478 // Mark newly obsolete methods in remaining previous versions. An EMCP method from
3479 // a previous redefinition may be made obsolete by this redefinition.
3480 Array<Method*>* old_methods = scratch_class->methods();
3481 mark_newly_obsolete_methods(old_methods, emcp_method_count);
3482
3483 // If the constant pool for this previous version of the class
3484 // is not marked as being on the stack, then none of the methods
3485 // in this previous version of the class are on the stack so
3486 // we don't need to add this as a previous version.
3487 ConstantPool* cp_ref = scratch_class->constants();
3488 if (!cp_ref->on_stack()) {
3489 RC_TRACE(0x00000400, ("add: scratch class not added; no methods are running"));
3490 // For debugging purposes.
3491 scratch_class->set_is_scratch_class();
3492 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class());
3493 // Update count for class unloading.
3494 _previous_version_count--;
3495 return;
3496 }
3497
3498 if (emcp_method_count != 0) {
3499 // At least one method is still running, check for EMCP methods
3500 for (int i = 0; i < old_methods->length(); i++) {
3501 Method* old_method = old_methods->at(i);
3502 if (!old_method->is_obsolete() && old_method->on_stack()) {
3503 // if EMCP method (not obsolete) is on the stack, mark as EMCP so that
3504 // we can add breakpoints for it.
3505
3506 // We set the method->on_stack bit during safepoints for class redefinition
3507 // and use this bit to set the is_running_emcp bit.
3508 // After the safepoint, the on_stack bit is cleared and the running emcp
3509 // method may exit. If so, we would set a breakpoint in a method that
3510 // is never reached, but this won't be noticeable to the programmer.
3511 old_method->set_running_emcp(true);
3512 RC_TRACE(0x00000400, ("add: EMCP method %s is on_stack " INTPTR_FORMAT,
3513 old_method->name_and_sig_as_C_string(), p2i(old_method)));
3514 } else if (!old_method->is_obsolete()) {
3515 RC_TRACE(0x00000400, ("add: EMCP method %s is NOT on_stack " INTPTR_FORMAT,
3516 old_method->name_and_sig_as_C_string(), p2i(old_method)));
3517 }
3518 }
3519 }
3520
3521 // Add previous version if any methods are still running.
3522 RC_TRACE(0x00000400, ("add: scratch class added; one of its methods is on_stack"));
3523 assert(scratch_class->previous_versions() == NULL, "shouldn't have a previous version");
3524 scratch_class->link_previous_versions(previous_versions());
3525 link_previous_versions(scratch_class());
3526 // Update count for class unloading.
3527 _previous_version_count++;
3528 } // end add_previous_version()
3529
3530
3531 Method* InstanceKlass::method_with_idnum(int idnum) {
3532 Method* m = NULL;
3533 if (idnum < methods()->length()) {
3534 m = methods()->at(idnum);
3535 }
3536 if (m == NULL || m->method_idnum() != idnum) {
3537 for (int index = 0; index < methods()->length(); ++index) {
3538 m = methods()->at(index);
3539 if (m->method_idnum() == idnum) {
3540 return m;
3541 }
3542 }
3543 // None found, return null for the caller to handle.
3544 return NULL;
3545 }
3546 return m;
3547 }
3548
3549
3550 Method* InstanceKlass::method_with_orig_idnum(int idnum) {
3551 if (idnum >= methods()->length()) {
3552 return NULL;
3553 }
3554 Method* m = methods()->at(idnum);
3555 if (m != NULL && m->orig_method_idnum() == idnum) {
3556 return m;
3557 }
3558 // Obsolete method idnum does not match the original idnum
3559 for (int index = 0; index < methods()->length(); ++index) {
3560 m = methods()->at(index);
3561 if (m->orig_method_idnum() == idnum) {
3562 return m;
3563 }
3564 }
3565 // None found, return null for the caller to handle.
3566 return NULL;
3567 }
3568
3569
3570 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) {
3571 InstanceKlass* holder = get_klass_version(version);
3572 if (holder == NULL) {
3573 return NULL; // The version of klass is gone, no method is found
3574 }
3575 Method* method = holder->method_with_orig_idnum(idnum);
3576 return method;
3577 }
3578
3579
3580 jint InstanceKlass::get_cached_class_file_len() {
3581 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
3582 }
3583
3584 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
3585 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
3586 }
3587
3588
3589 /////////////// Unit tests ///////////////
3590
3591 #ifndef PRODUCT
3592
3593 class TestDependencyContext {
3594 public:
3595 nmethod* _nmethods[3];
3596
3597 intptr_t _dependency_context;
3598
3599 TestDependencyContext() : _dependency_context(DependencyContext::EMPTY) {
3600 CodeCache_lock->lock_without_safepoint_check();
3601
3602 DependencyContext depContext(&_dependency_context);
3603
3604 _nmethods[0] = reinterpret_cast<nmethod*>(0x8 * 0);
3605 _nmethods[1] = reinterpret_cast<nmethod*>(0x8 * 1);
3606 _nmethods[2] = reinterpret_cast<nmethod*>(0x8 * 2);
3607
3608 depContext.add_dependent_nmethod(_nmethods[2]);
3609 depContext.add_dependent_nmethod(_nmethods[1]);
3610 depContext.add_dependent_nmethod(_nmethods[0]);
3611 }
3612
3613 ~TestDependencyContext() {
3614 wipe();
3615 CodeCache_lock->unlock();
3616 }
3617
3618 static void testRemoveDependentNmethod(int id, bool delete_immediately) {
3619 TestDependencyContext c;
3620 DependencyContext depContext(&c._dependency_context);
3621 assert(!has_stale_entries(depContext), "check");
3622
3623 nmethod* nm = c._nmethods[id];
3624 depContext.remove_dependent_nmethod(nm, delete_immediately);
3625
3626 if (!delete_immediately) {
3627 assert(has_stale_entries(depContext), "check");
3628 assert(depContext.is_dependent_nmethod(nm), "check");
3629 depContext.expunge_stale_entries();
3630 }
3631
3632 assert(!has_stale_entries(depContext), "check");
3633 assert(!depContext.is_dependent_nmethod(nm), "check");
3634 }
3635
3636 static void testRemoveDependentNmethod() {
3637 testRemoveDependentNmethod(0, false);
3638 testRemoveDependentNmethod(1, false);
3639 testRemoveDependentNmethod(2, false);
3640
3641 testRemoveDependentNmethod(0, true);
3642 testRemoveDependentNmethod(1, true);
3643 testRemoveDependentNmethod(2, true);
3644 }
3645
3646 static void test() {
3647 testRemoveDependentNmethod();
3648 }
3649
3650 static bool has_stale_entries(DependencyContext ctx) {
3651 assert(ctx.has_stale_entries() == ctx.find_stale_entries(), "check");
3652 return ctx.has_stale_entries();
3653 }
3654
3655 void wipe() {
3656 DependencyContext ctx(&_dependency_context);
3657 nmethodBucket* b = ctx.dependencies();
3658 ctx.set_dependencies(NULL);
3659 ctx.set_has_stale_entries(false);
3660 while (b != NULL) {
3661 nmethodBucket* next = b->next();
3662 delete b;
3663 b = next;
3664 }
3665 }
3666 };
3667
3668 void TestDependencyContext_test() {
3669 TestDependencyContext::test();
3670 }
3671
3672 #endif