1/*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "jvm.h"
27#include "aot/aotLoader.hpp"
28#include "classfile/classFileParser.hpp"
29#include "classfile/classFileStream.hpp"
30#include "classfile/classLoader.hpp"
31#include "classfile/classLoaderData.inline.hpp"
32#include "classfile/javaClasses.hpp"
33#include "classfile/moduleEntry.hpp"
34#include "classfile/symbolTable.hpp"
35#include "classfile/systemDictionary.hpp"
36#include "classfile/systemDictionaryShared.hpp"
37#include "classfile/verifier.hpp"
38#include "classfile/vmSymbols.hpp"
39#include "code/dependencyContext.hpp"
40#include "compiler/compileBroker.hpp"
41#include "gc/shared/collectedHeap.inline.hpp"
42#include "interpreter/oopMapCache.hpp"
43#include "interpreter/rewriter.hpp"
44#include "jvmtifiles/jvmti.h"
45#include "logging/log.hpp"
46#include "logging/logMessage.hpp"
47#include "logging/logStream.hpp"
48#include "memory/allocation.inline.hpp"
49#include "memory/heapInspection.hpp"
50#include "memory/iterator.inline.hpp"
51#include "memory/metadataFactory.hpp"
52#include "memory/metaspaceClosure.hpp"
53#include "memory/metaspaceShared.hpp"
54#include "memory/oopFactory.hpp"
55#include "memory/resourceArea.hpp"
56#include "memory/universe.hpp"
57#include "oops/fieldStreams.hpp"
58#include "oops/constantPool.hpp"
59#include "oops/instanceClassLoaderKlass.hpp"
60#include "oops/instanceKlass.inline.hpp"
61#include "oops/instanceMirrorKlass.hpp"
62#include "oops/instanceOop.hpp"
63#include "oops/klass.inline.hpp"
64#include "oops/method.hpp"
65#include "oops/oop.inline.hpp"
66#include "oops/symbol.hpp"
67#include "prims/jvmtiExport.hpp"
68#include "prims/jvmtiRedefineClasses.hpp"
69#include "prims/jvmtiThreadState.hpp"
70#include "prims/methodComparator.hpp"
71#include "runtime/atomic.hpp"
72#include "runtime/fieldDescriptor.inline.hpp"
73#include "runtime/handles.inline.hpp"
74#include "runtime/javaCalls.hpp"
75#include "runtime/mutexLocker.hpp"
76#include "runtime/orderAccess.hpp"
77#include "runtime/thread.inline.hpp"
78#include "services/classLoadingService.hpp"
79#include "services/threadService.hpp"
80#include "utilities/dtrace.hpp"
81#include "utilities/events.hpp"
82#include "utilities/macros.hpp"
83#include "utilities/stringUtils.hpp"
84#ifdef COMPILER1
85#include "c1/c1_Compiler.hpp"
86#endif
87#if INCLUDE_JFR
88#include "jfr/jfrEvents.hpp"
89#endif
90
91
92#ifdef DTRACE_ENABLED
93
94
95#define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED
96#define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE
97#define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT
98#define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS
99#define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED
100#define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT
101#define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR
102#define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END
103#define DTRACE_CLASSINIT_PROBE(type, thread_type) \
104 { \
105 char* data = NULL; \
106 int len = 0; \
107 Symbol* clss_name = name(); \
108 if (clss_name != NULL) { \
109 data = (char*)clss_name->bytes(); \
110 len = clss_name->utf8_length(); \
111 } \
112 HOTSPOT_CLASS_INITIALIZATION_##type( \
113 data, len, (void*)class_loader(), thread_type); \
114 }
115
116#define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) \
117 { \
118 char* data = NULL; \
119 int len = 0; \
120 Symbol* clss_name = name(); \
121 if (clss_name != NULL) { \
122 data = (char*)clss_name->bytes(); \
123 len = clss_name->utf8_length(); \
124 } \
125 HOTSPOT_CLASS_INITIALIZATION_##type( \
126 data, len, (void*)class_loader(), thread_type, wait); \
127 }
128
129#else // ndef DTRACE_ENABLED
130
131#define DTRACE_CLASSINIT_PROBE(type, thread_type)
132#define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait)
133
134#endif // ndef DTRACE_ENABLED
135
136static inline bool is_class_loader(const Symbol* class_name,
137 const ClassFileParser& parser) {
138 assert(class_name != NULL, "invariant");
139
140 if (class_name == vmSymbols::java_lang_ClassLoader()) {
141 return true;
142 }
143
144 if (SystemDictionary::ClassLoader_klass_loaded()) {
145 const Klass* const super_klass = parser.super_klass();
146 if (super_klass != NULL) {
147 if (super_klass->is_subtype_of(SystemDictionary::ClassLoader_klass())) {
148 return true;
149 }
150 }
151 }
152 return false;
153}
154
155// called to verify that k is a member of this nest
156bool InstanceKlass::has_nest_member(InstanceKlass* k, TRAPS) const {
157 if (_nest_members == NULL || _nest_members == Universe::the_empty_short_array()) {
158 if (log_is_enabled(Trace, class, nestmates)) {
159 ResourceMark rm(THREAD);
160 log_trace(class, nestmates)("Checked nest membership of %s in non-nest-host class %s",
161 k->external_name(), this->external_name());
162 }
163 return false;
164 }
165
166 if (log_is_enabled(Trace, class, nestmates)) {
167 ResourceMark rm(THREAD);
168 log_trace(class, nestmates)("Checking nest membership of %s in %s",
169 k->external_name(), this->external_name());
170 }
171
172 // Check for a resolved cp entry , else fall back to a name check.
173 // We don't want to resolve any class other than the one being checked.
174 for (int i = 0; i < _nest_members->length(); i++) {
175 int cp_index = _nest_members->at(i);
176 if (_constants->tag_at(cp_index).is_klass()) {
177 Klass* k2 = _constants->klass_at(cp_index, CHECK_false);
178 if (k2 == k) {
179 log_trace(class, nestmates)("- class is listed at nest_members[%d] => cp[%d]", i, cp_index);
180 return true;
181 }
182 }
183 else {
184 Symbol* name = _constants->klass_name_at(cp_index);
185 if (name == k->name()) {
186 log_trace(class, nestmates)("- Found it at nest_members[%d] => cp[%d]", i, cp_index);
187
188 // Names match so check actual klass - this may trigger class loading if
189 // it doesn't match (though that should be impossible). But to be safe we
190 // have to check for a compiler thread executing here.
191 if (!THREAD->can_call_java() && !_constants->tag_at(cp_index).is_klass()) {
192 log_trace(class, nestmates)("- validation required resolution in an unsuitable thread");
193 return false;
194 }
195
196 Klass* k2 = _constants->klass_at(cp_index, CHECK_false);
197 if (k2 == k) {
198 log_trace(class, nestmates)("- class is listed as a nest member");
199 return true;
200 }
201 else {
202 // same name but different klass!
203 log_trace(class, nestmates)(" - klass comparison failed!");
204 // can't have two names the same, so we're done
205 return false;
206 }
207 }
208 }
209 }
210 log_trace(class, nestmates)("- class is NOT a nest member!");
211 return false;
212}
213
214// Return nest-host class, resolving, validating and saving it if needed.
215// In cases where this is called from a thread that can not do classloading
216// (such as a native JIT thread) then we simply return NULL, which in turn
217// causes the access check to return false. Such code will retry the access
218// from a more suitable environment later.
219InstanceKlass* InstanceKlass::nest_host(Symbol* validationException, TRAPS) {
220 InstanceKlass* nest_host_k = _nest_host;
221 if (nest_host_k == NULL) {
222 // need to resolve and save our nest-host class. This could be attempted
223 // concurrently but as the result is idempotent and we don't use the class
224 // then we do not need any synchronization beyond what is implicitly used
225 // during class loading.
226 if (_nest_host_index != 0) { // we have a real nest_host
227 // Before trying to resolve check if we're in a suitable context
228 if (!THREAD->can_call_java() && !_constants->tag_at(_nest_host_index).is_klass()) {
229 if (log_is_enabled(Trace, class, nestmates)) {
230 ResourceMark rm(THREAD);
231 log_trace(class, nestmates)("Rejected resolution of nest-host of %s in unsuitable thread",
232 this->external_name());
233 }
234 return NULL;
235 }
236
237 if (log_is_enabled(Trace, class, nestmates)) {
238 ResourceMark rm(THREAD);
239 log_trace(class, nestmates)("Resolving nest-host of %s using cp entry for %s",
240 this->external_name(),
241 _constants->klass_name_at(_nest_host_index)->as_C_string());
242 }
243
244 Klass* k = _constants->klass_at(_nest_host_index, THREAD);
245 if (HAS_PENDING_EXCEPTION) {
246 Handle exc_h = Handle(THREAD, PENDING_EXCEPTION);
247 if (exc_h->is_a(SystemDictionary::NoClassDefFoundError_klass())) {
248 // throw a new CDNFE with the original as its cause, and a clear msg
249 ResourceMark rm(THREAD);
250 char buf[200];
251 CLEAR_PENDING_EXCEPTION;
252 jio_snprintf(buf, sizeof(buf),
253 "Unable to load nest-host class (%s) of %s",
254 _constants->klass_name_at(_nest_host_index)->as_C_string(),
255 this->external_name());
256 log_trace(class, nestmates)("%s - NoClassDefFoundError", buf);
257 THROW_MSG_CAUSE_NULL(vmSymbols::java_lang_NoClassDefFoundError(), buf, exc_h);
258 }
259 // All other exceptions pass through (OOME, StackOverflowError, LinkageErrors etc).
260 return NULL;
261 }
262
263 // A valid nest-host is an instance class in the current package that lists this
264 // class as a nest member. If any of these conditions are not met we post the
265 // requested exception type (if any) and return NULL
266
267 const char* error = NULL;
268
269 // JVMS 5.4.4 indicates package check comes first
270 if (is_same_class_package(k)) {
271
272 // Now check actual membership. We can't be a member if our "host" is
273 // not an instance class.
274 if (k->is_instance_klass()) {
275 nest_host_k = InstanceKlass::cast(k);
276
277 bool is_member = nest_host_k->has_nest_member(this, CHECK_NULL);
278 if (is_member) {
279 // save resolved nest-host value
280 _nest_host = nest_host_k;
281
282 if (log_is_enabled(Trace, class, nestmates)) {
283 ResourceMark rm(THREAD);
284 log_trace(class, nestmates)("Resolved nest-host of %s to %s",
285 this->external_name(), k->external_name());
286 }
287 return nest_host_k;
288 }
289 }
290 error = "current type is not listed as a nest member";
291 } else {
292 error = "types are in different packages";
293 }
294
295 if (log_is_enabled(Trace, class, nestmates)) {
296 ResourceMark rm(THREAD);
297 log_trace(class, nestmates)
298 ("Type %s (loader: %s) is not a nest member of "
299 "resolved type %s (loader: %s): %s",
300 this->external_name(),
301 this->class_loader_data()->loader_name_and_id(),
302 k->external_name(),
303 k->class_loader_data()->loader_name_and_id(),
304 error);
305 }
306
307 if (validationException != NULL && THREAD->can_call_java()) {
308 ResourceMark rm(THREAD);
309 Exceptions::fthrow(THREAD_AND_LOCATION,
310 validationException,
311 "Type %s (loader: %s) is not a nest member of %s (loader: %s): %s",
312 this->external_name(),
313 this->class_loader_data()->loader_name_and_id(),
314 k->external_name(),
315 k->class_loader_data()->loader_name_and_id(),
316 error
317 );
318 }
319 return NULL;
320 } else {
321 if (log_is_enabled(Trace, class, nestmates)) {
322 ResourceMark rm(THREAD);
323 log_trace(class, nestmates)("Type %s is not part of a nest: setting nest-host to self",
324 this->external_name());
325 }
326 // save resolved nest-host value
327 return (_nest_host = this);
328 }
329 }
330 return nest_host_k;
331}
332
333// check if 'this' and k are nestmates (same nest_host), or k is our nest_host,
334// or we are k's nest_host - all of which is covered by comparing the two
335// resolved_nest_hosts
336bool InstanceKlass::has_nestmate_access_to(InstanceKlass* k, TRAPS) {
337
338 assert(this != k, "this should be handled by higher-level code");
339
340 // Per JVMS 5.4.4 we first resolve and validate the current class, then
341 // the target class k. Resolution exceptions will be passed on by upper
342 // layers. IncompatibleClassChangeErrors from membership validation failures
343 // will also be passed through.
344
345 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
346 InstanceKlass* cur_host = nest_host(icce, CHECK_false);
347 if (cur_host == NULL) {
348 return false;
349 }
350
351 Klass* k_nest_host = k->nest_host(icce, CHECK_false);
352 if (k_nest_host == NULL) {
353 return false;
354 }
355
356 bool access = (cur_host == k_nest_host);
357
358 if (log_is_enabled(Trace, class, nestmates)) {
359 ResourceMark rm(THREAD);
360 log_trace(class, nestmates)("Class %s does %shave nestmate access to %s",
361 this->external_name(),
362 access ? "" : "NOT ",
363 k->external_name());
364 }
365
366 return access;
367}
368
369InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) {
370 const int size = InstanceKlass::size(parser.vtable_size(),
371 parser.itable_size(),
372 nonstatic_oop_map_size(parser.total_oop_map_count()),
373 parser.is_interface(),
374 parser.is_unsafe_anonymous(),
375 should_store_fingerprint(parser.is_unsafe_anonymous()));
376
377 const Symbol* const class_name = parser.class_name();
378 assert(class_name != NULL, "invariant");
379 ClassLoaderData* loader_data = parser.loader_data();
380 assert(loader_data != NULL, "invariant");
381
382 InstanceKlass* ik;
383
384 // Allocation
385 if (REF_NONE == parser.reference_type()) {
386 if (class_name == vmSymbols::java_lang_Class()) {
387 // mirror
388 ik = new (loader_data, size, THREAD) InstanceMirrorKlass(parser);
389 }
390 else if (is_class_loader(class_name, parser)) {
391 // class loader
392 ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser);
393 } else {
394 // normal
395 ik = new (loader_data, size, THREAD) InstanceKlass(parser, InstanceKlass::_misc_kind_other);
396 }
397 } else {
398 // reference
399 ik = new (loader_data, size, THREAD) InstanceRefKlass(parser);
400 }
401
402 // Check for pending exception before adding to the loader data and incrementing
403 // class count. Can get OOM here.
404 if (HAS_PENDING_EXCEPTION) {
405 return NULL;
406 }
407
408 return ik;
409}
410
411
412// copy method ordering from resource area to Metaspace
413void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) {
414 if (m != NULL) {
415 // allocate a new array and copy contents (memcpy?)
416 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
417 for (int i = 0; i < m->length(); i++) {
418 _method_ordering->at_put(i, m->at(i));
419 }
420 } else {
421 _method_ordering = Universe::the_empty_int_array();
422 }
423}
424
425// create a new array of vtable_indices for default methods
426Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
427 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
428 assert(default_vtable_indices() == NULL, "only create once");
429 set_default_vtable_indices(vtable_indices);
430 return vtable_indices;
431}
432
433InstanceKlass::InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id) :
434 Klass(id),
435 _nest_members(NULL),
436 _nest_host_index(0),
437 _nest_host(NULL),
438 _static_field_size(parser.static_field_size()),
439 _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())),
440 _itable_len(parser.itable_size()),
441 _init_thread(NULL),
442 _init_state(allocated),
443 _reference_type(parser.reference_type())
444{
445 set_vtable_length(parser.vtable_size());
446 set_kind(kind);
447 set_access_flags(parser.access_flags());
448 set_is_unsafe_anonymous(parser.is_unsafe_anonymous());
449 set_layout_helper(Klass::instance_layout_helper(parser.layout_size(),
450 false));
451
452 assert(NULL == _methods, "underlying memory not zeroed?");
453 assert(is_instance_klass(), "is layout incorrect?");
454 assert(size_helper() == parser.layout_size(), "incorrect size_helper?");
455
456 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
457 SystemDictionaryShared::init_dumptime_info(this);
458 }
459}
460
461void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
462 Array<Method*>* methods) {
463 if (methods != NULL && methods != Universe::the_empty_method_array() &&
464 !methods->is_shared()) {
465 for (int i = 0; i < methods->length(); i++) {
466 Method* method = methods->at(i);
467 if (method == NULL) continue; // maybe null if error processing
468 // Only want to delete methods that are not executing for RedefineClasses.
469 // The previous version will point to them so they're not totally dangling
470 assert (!method->on_stack(), "shouldn't be called with methods on stack");
471 MetadataFactory::free_metadata(loader_data, method);
472 }
473 MetadataFactory::free_array<Method*>(loader_data, methods);
474 }
475}
476
477void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
478 const Klass* super_klass,
479 Array<InstanceKlass*>* local_interfaces,
480 Array<InstanceKlass*>* transitive_interfaces) {
481 // Only deallocate transitive interfaces if not empty, same as super class
482 // or same as local interfaces. See code in parseClassFile.
483 Array<InstanceKlass*>* ti = transitive_interfaces;
484 if (ti != Universe::the_empty_instance_klass_array() && ti != local_interfaces) {
485 // check that the interfaces don't come from super class
486 Array<InstanceKlass*>* sti = (super_klass == NULL) ? NULL :
487 InstanceKlass::cast(super_klass)->transitive_interfaces();
488 if (ti != sti && ti != NULL && !ti->is_shared()) {
489 MetadataFactory::free_array<InstanceKlass*>(loader_data, ti);
490 }
491 }
492
493 // local interfaces can be empty
494 if (local_interfaces != Universe::the_empty_instance_klass_array() &&
495 local_interfaces != NULL && !local_interfaces->is_shared()) {
496 MetadataFactory::free_array<InstanceKlass*>(loader_data, local_interfaces);
497 }
498}
499
500// This function deallocates the metadata and C heap pointers that the
501// InstanceKlass points to.
502void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
503
504 // Orphan the mirror first, CMS thinks it's still live.
505 if (java_mirror() != NULL) {
506 java_lang_Class::set_klass(java_mirror(), NULL);
507 }
508
509 // Also remove mirror from handles
510 loader_data->remove_handle(_java_mirror);
511
512 // Need to take this class off the class loader data list.
513 loader_data->remove_class(this);
514
515 // The array_klass for this class is created later, after error handling.
516 // For class redefinition, we keep the original class so this scratch class
517 // doesn't have an array class. Either way, assert that there is nothing
518 // to deallocate.
519 assert(array_klasses() == NULL, "array classes shouldn't be created for this class yet");
520
521 // Release C heap allocated data that this might point to, which includes
522 // reference counting symbol names.
523 release_C_heap_structures();
524
525 deallocate_methods(loader_data, methods());
526 set_methods(NULL);
527
528 if (method_ordering() != NULL &&
529 method_ordering() != Universe::the_empty_int_array() &&
530 !method_ordering()->is_shared()) {
531 MetadataFactory::free_array<int>(loader_data, method_ordering());
532 }
533 set_method_ordering(NULL);
534
535 // default methods can be empty
536 if (default_methods() != NULL &&
537 default_methods() != Universe::the_empty_method_array() &&
538 !default_methods()->is_shared()) {
539 MetadataFactory::free_array<Method*>(loader_data, default_methods());
540 }
541 // Do NOT deallocate the default methods, they are owned by superinterfaces.
542 set_default_methods(NULL);
543
544 // default methods vtable indices can be empty
545 if (default_vtable_indices() != NULL &&
546 !default_vtable_indices()->is_shared()) {
547 MetadataFactory::free_array<int>(loader_data, default_vtable_indices());
548 }
549 set_default_vtable_indices(NULL);
550
551
552 // This array is in Klass, but remove it with the InstanceKlass since
553 // this place would be the only caller and it can share memory with transitive
554 // interfaces.
555 if (secondary_supers() != NULL &&
556 secondary_supers() != Universe::the_empty_klass_array() &&
557 // see comments in compute_secondary_supers about the following cast
558 (address)(secondary_supers()) != (address)(transitive_interfaces()) &&
559 !secondary_supers()->is_shared()) {
560 MetadataFactory::free_array<Klass*>(loader_data, secondary_supers());
561 }
562 set_secondary_supers(NULL);
563
564 deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces());
565 set_transitive_interfaces(NULL);
566 set_local_interfaces(NULL);
567
568 if (fields() != NULL && !fields()->is_shared()) {
569 MetadataFactory::free_array<jushort>(loader_data, fields());
570 }
571 set_fields(NULL, 0);
572
573 // If a method from a redefined class is using this constant pool, don't
574 // delete it, yet. The new class's previous version will point to this.
575 if (constants() != NULL) {
576 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack");
577 if (!constants()->is_shared()) {
578 MetadataFactory::free_metadata(loader_data, constants());
579 }
580 // Delete any cached resolution errors for the constant pool
581 SystemDictionary::delete_resolution_error(constants());
582
583 set_constants(NULL);
584 }
585
586 if (inner_classes() != NULL &&
587 inner_classes() != Universe::the_empty_short_array() &&
588 !inner_classes()->is_shared()) {
589 MetadataFactory::free_array<jushort>(loader_data, inner_classes());
590 }
591 set_inner_classes(NULL);
592
593 if (nest_members() != NULL &&
594 nest_members() != Universe::the_empty_short_array() &&
595 !nest_members()->is_shared()) {
596 MetadataFactory::free_array<jushort>(loader_data, nest_members());
597 }
598 set_nest_members(NULL);
599
600 // We should deallocate the Annotations instance if it's not in shared spaces.
601 if (annotations() != NULL && !annotations()->is_shared()) {
602 MetadataFactory::free_metadata(loader_data, annotations());
603 }
604 set_annotations(NULL);
605
606 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
607 SystemDictionaryShared::remove_dumptime_info(this);
608 }
609}
610
611bool InstanceKlass::should_be_initialized() const {
612 return !is_initialized();
613}
614
615klassItable InstanceKlass::itable() const {
616 return klassItable(const_cast<InstanceKlass*>(this));
617}
618
619void InstanceKlass::eager_initialize(Thread *thread) {
620 if (!EagerInitialization) return;
621
622 if (this->is_not_initialized()) {
623 // abort if the the class has a class initializer
624 if (this->class_initializer() != NULL) return;
625
626 // abort if it is java.lang.Object (initialization is handled in genesis)
627 Klass* super_klass = super();
628 if (super_klass == NULL) return;
629
630 // abort if the super class should be initialized
631 if (!InstanceKlass::cast(super_klass)->is_initialized()) return;
632
633 // call body to expose the this pointer
634 eager_initialize_impl();
635 }
636}
637
638// JVMTI spec thinks there are signers and protection domain in the
639// instanceKlass. These accessors pretend these fields are there.
640// The hprof specification also thinks these fields are in InstanceKlass.
641oop InstanceKlass::protection_domain() const {
642 // return the protection_domain from the mirror
643 return java_lang_Class::protection_domain(java_mirror());
644}
645
646// To remove these from requires an incompatible change and CCC request.
647objArrayOop InstanceKlass::signers() const {
648 // return the signers from the mirror
649 return java_lang_Class::signers(java_mirror());
650}
651
652oop InstanceKlass::init_lock() const {
653 // return the init lock from the mirror
654 oop lock = java_lang_Class::init_lock(java_mirror());
655 // Prevent reordering with any access of initialization state
656 OrderAccess::loadload();
657 assert((oop)lock != NULL || !is_not_initialized(), // initialized or in_error state
658 "only fully initialized state can have a null lock");
659 return lock;
660}
661
662// Set the initialization lock to null so the object can be GC'ed. Any racing
663// threads to get this lock will see a null lock and will not lock.
664// That's okay because they all check for initialized state after getting
665// the lock and return.
666void InstanceKlass::fence_and_clear_init_lock() {
667 // make sure previous stores are all done, notably the init_state.
668 OrderAccess::storestore();
669 java_lang_Class::set_init_lock(java_mirror(), NULL);
670 assert(!is_not_initialized(), "class must be initialized now");
671}
672
673void InstanceKlass::eager_initialize_impl() {
674 EXCEPTION_MARK;
675 HandleMark hm(THREAD);
676 Handle h_init_lock(THREAD, init_lock());
677 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
678
679 // abort if someone beat us to the initialization
680 if (!is_not_initialized()) return; // note: not equivalent to is_initialized()
681
682 ClassState old_state = init_state();
683 link_class_impl(THREAD);
684 if (HAS_PENDING_EXCEPTION) {
685 CLEAR_PENDING_EXCEPTION;
686 // Abort if linking the class throws an exception.
687
688 // Use a test to avoid redundantly resetting the state if there's
689 // no change. Set_init_state() asserts that state changes make
690 // progress, whereas here we might just be spinning in place.
691 if (old_state != _init_state)
692 set_init_state(old_state);
693 } else {
694 // linking successfull, mark class as initialized
695 set_init_state(fully_initialized);
696 fence_and_clear_init_lock();
697 // trace
698 if (log_is_enabled(Info, class, init)) {
699 ResourceMark rm(THREAD);
700 log_info(class, init)("[Initialized %s without side effects]", external_name());
701 }
702 }
703}
704
705
706// See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization
707// process. The step comments refers to the procedure described in that section.
708// Note: implementation moved to static method to expose the this pointer.
709void InstanceKlass::initialize(TRAPS) {
710 if (this->should_be_initialized()) {
711 initialize_impl(CHECK);
712 // Note: at this point the class may be initialized
713 // OR it may be in the state of being initialized
714 // in case of recursive initialization!
715 } else {
716 assert(is_initialized(), "sanity check");
717 }
718}
719
720
721bool InstanceKlass::verify_code(TRAPS) {
722 // 1) Verify the bytecodes
723 return Verifier::verify(this, should_verify_class(), THREAD);
724}
725
726void InstanceKlass::link_class(TRAPS) {
727 assert(is_loaded(), "must be loaded");
728 if (!is_linked()) {
729 link_class_impl(CHECK);
730 }
731}
732
733// Called to verify that a class can link during initialization, without
734// throwing a VerifyError.
735bool InstanceKlass::link_class_or_fail(TRAPS) {
736 assert(is_loaded(), "must be loaded");
737 if (!is_linked()) {
738 link_class_impl(CHECK_false);
739 }
740 return is_linked();
741}
742
743bool InstanceKlass::link_class_impl(TRAPS) {
744 if (DumpSharedSpaces && is_in_error_state()) {
745 // This is for CDS dumping phase only -- we use the in_error_state to indicate that
746 // the class has failed verification. Throwing the NoClassDefFoundError here is just
747 // a convenient way to stop repeat attempts to verify the same (bad) class.
748 //
749 // Note that the NoClassDefFoundError is not part of the JLS, and should not be thrown
750 // if we are executing Java code. This is not a problem for CDS dumping phase since
751 // it doesn't execute any Java code.
752 ResourceMark rm(THREAD);
753 Exceptions::fthrow(THREAD_AND_LOCATION,
754 vmSymbols::java_lang_NoClassDefFoundError(),
755 "Class %s, or one of its supertypes, failed class initialization",
756 external_name());
757 return false;
758 }
759 // return if already verified
760 if (is_linked()) {
761 return true;
762 }
763
764 // Timing
765 // timer handles recursion
766 assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl");
767 JavaThread* jt = (JavaThread*)THREAD;
768
769 // link super class before linking this class
770 Klass* super_klass = super();
771 if (super_klass != NULL) {
772 if (super_klass->is_interface()) { // check if super class is an interface
773 ResourceMark rm(THREAD);
774 Exceptions::fthrow(
775 THREAD_AND_LOCATION,
776 vmSymbols::java_lang_IncompatibleClassChangeError(),
777 "class %s has interface %s as super class",
778 external_name(),
779 super_klass->external_name()
780 );
781 return false;
782 }
783
784 InstanceKlass* ik_super = InstanceKlass::cast(super_klass);
785 ik_super->link_class_impl(CHECK_false);
786 }
787
788 // link all interfaces implemented by this class before linking this class
789 Array<InstanceKlass*>* interfaces = local_interfaces();
790 int num_interfaces = interfaces->length();
791 for (int index = 0; index < num_interfaces; index++) {
792 InstanceKlass* interk = interfaces->at(index);
793 interk->link_class_impl(CHECK_false);
794 }
795
796 // in case the class is linked in the process of linking its superclasses
797 if (is_linked()) {
798 return true;
799 }
800
801 // trace only the link time for this klass that includes
802 // the verification time
803 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
804 ClassLoader::perf_class_link_selftime(),
805 ClassLoader::perf_classes_linked(),
806 jt->get_thread_stat()->perf_recursion_counts_addr(),
807 jt->get_thread_stat()->perf_timers_addr(),
808 PerfClassTraceTime::CLASS_LINK);
809
810 // verification & rewriting
811 {
812 HandleMark hm(THREAD);
813 Handle h_init_lock(THREAD, init_lock());
814 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
815 // rewritten will have been set if loader constraint error found
816 // on an earlier link attempt
817 // don't verify or rewrite if already rewritten
818 //
819
820 if (!is_linked()) {
821 if (!is_rewritten()) {
822 {
823 bool verify_ok = verify_code(THREAD);
824 if (!verify_ok) {
825 return false;
826 }
827 }
828
829 // Just in case a side-effect of verify linked this class already
830 // (which can sometimes happen since the verifier loads classes
831 // using custom class loaders, which are free to initialize things)
832 if (is_linked()) {
833 return true;
834 }
835
836 // also sets rewritten
837 rewrite_class(CHECK_false);
838 } else if (is_shared()) {
839 SystemDictionaryShared::check_verification_constraints(this, CHECK_false);
840 }
841
842 // relocate jsrs and link methods after they are all rewritten
843 link_methods(CHECK_false);
844
845 // Initialize the vtable and interface table after
846 // methods have been rewritten since rewrite may
847 // fabricate new Method*s.
848 // also does loader constraint checking
849 //
850 // initialize_vtable and initialize_itable need to be rerun for
851 // a shared class if the class is not loaded by the NULL classloader.
852 ClassLoaderData * loader_data = class_loader_data();
853 if (!(is_shared() &&
854 loader_data->is_the_null_class_loader_data())) {
855 vtable().initialize_vtable(true, CHECK_false);
856 itable().initialize_itable(true, CHECK_false);
857 }
858#ifdef ASSERT
859 else {
860 vtable().verify(tty, true);
861 // In case itable verification is ever added.
862 // itable().verify(tty, true);
863 }
864#endif
865 set_init_state(linked);
866 if (JvmtiExport::should_post_class_prepare()) {
867 Thread *thread = THREAD;
868 assert(thread->is_Java_thread(), "thread->is_Java_thread()");
869 JvmtiExport::post_class_prepare((JavaThread *) thread, this);
870 }
871 }
872 }
873 return true;
874}
875
876// Rewrite the byte codes of all of the methods of a class.
877// The rewriter must be called exactly once. Rewriting must happen after
878// verification but before the first method of the class is executed.
879void InstanceKlass::rewrite_class(TRAPS) {
880 assert(is_loaded(), "must be loaded");
881 if (is_rewritten()) {
882 assert(is_shared(), "rewriting an unshared class?");
883 return;
884 }
885 Rewriter::rewrite(this, CHECK);
886 set_rewritten();
887}
888
889// Now relocate and link method entry points after class is rewritten.
890// This is outside is_rewritten flag. In case of an exception, it can be
891// executed more than once.
892void InstanceKlass::link_methods(TRAPS) {
893 int len = methods()->length();
894 for (int i = len-1; i >= 0; i--) {
895 methodHandle m(THREAD, methods()->at(i));
896
897 // Set up method entry points for compiler and interpreter .
898 m->link_method(m, CHECK);
899 }
900}
901
902// Eagerly initialize superinterfaces that declare default methods (concrete instance: any access)
903void InstanceKlass::initialize_super_interfaces(TRAPS) {
904 assert (has_nonstatic_concrete_methods(), "caller should have checked this");
905 for (int i = 0; i < local_interfaces()->length(); ++i) {
906 InstanceKlass* ik = local_interfaces()->at(i);
907
908 // Initialization is depth first search ie. we start with top of the inheritance tree
909 // has_nonstatic_concrete_methods drives searching superinterfaces since it
910 // means has_nonstatic_concrete_methods in its superinterface hierarchy
911 if (ik->has_nonstatic_concrete_methods()) {
912 ik->initialize_super_interfaces(CHECK);
913 }
914
915 // Only initialize() interfaces that "declare" concrete methods.
916 if (ik->should_be_initialized() && ik->declares_nonstatic_concrete_methods()) {
917 ik->initialize(CHECK);
918 }
919 }
920}
921
922void InstanceKlass::initialize_impl(TRAPS) {
923 HandleMark hm(THREAD);
924
925 // Make sure klass is linked (verified) before initialization
926 // A class could already be verified, since it has been reflected upon.
927 link_class(CHECK);
928
929 DTRACE_CLASSINIT_PROBE(required, -1);
930
931 bool wait = false;
932
933 assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl");
934 JavaThread* jt = (JavaThread*)THREAD;
935
936 // refer to the JVM book page 47 for description of steps
937 // Step 1
938 {
939 Handle h_init_lock(THREAD, init_lock());
940 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
941
942 // Step 2
943 // If we were to use wait() instead of waitInterruptibly() then
944 // we might end up throwing IE from link/symbol resolution sites
945 // that aren't expected to throw. This would wreak havoc. See 6320309.
946 while (is_being_initialized() && !is_reentrant_initialization(jt)) {
947 wait = true;
948 jt->set_class_to_be_initialized(this);
949 ol.waitUninterruptibly(jt);
950 jt->set_class_to_be_initialized(NULL);
951 }
952
953 // Step 3
954 if (is_being_initialized() && is_reentrant_initialization(jt)) {
955 DTRACE_CLASSINIT_PROBE_WAIT(recursive, -1, wait);
956 return;
957 }
958
959 // Step 4
960 if (is_initialized()) {
961 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, -1, wait);
962 return;
963 }
964
965 // Step 5
966 if (is_in_error_state()) {
967 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait);
968 ResourceMark rm(THREAD);
969 const char* desc = "Could not initialize class ";
970 const char* className = external_name();
971 size_t msglen = strlen(desc) + strlen(className) + 1;
972 char* message = NEW_RESOURCE_ARRAY(char, msglen);
973 if (NULL == message) {
974 // Out of memory: can't create detailed error message
975 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className);
976 } else {
977 jio_snprintf(message, msglen, "%s%s", desc, className);
978 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message);
979 }
980 }
981
982 // Step 6
983 set_init_state(being_initialized);
984 set_init_thread(jt);
985 }
986
987 // Step 7
988 // Next, if C is a class rather than an interface, initialize it's super class and super
989 // interfaces.
990 if (!is_interface()) {
991 Klass* super_klass = super();
992 if (super_klass != NULL && super_klass->should_be_initialized()) {
993 super_klass->initialize(THREAD);
994 }
995 // If C implements any interface that declares a non-static, concrete method,
996 // the initialization of C triggers initialization of its super interfaces.
997 // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and
998 // having a superinterface that declares, non-static, concrete methods
999 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) {
1000 initialize_super_interfaces(THREAD);
1001 }
1002
1003 // If any exceptions, complete abruptly, throwing the same exception as above.
1004 if (HAS_PENDING_EXCEPTION) {
1005 Handle e(THREAD, PENDING_EXCEPTION);
1006 CLEAR_PENDING_EXCEPTION;
1007 {
1008 EXCEPTION_MARK;
1009 // Locks object, set state, and notify all waiting threads
1010 set_initialization_state_and_notify(initialization_error, THREAD);
1011 CLEAR_PENDING_EXCEPTION;
1012 }
1013 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait);
1014 THROW_OOP(e());
1015 }
1016 }
1017
1018
1019 // Look for aot compiled methods for this klass, including class initializer.
1020 AOTLoader::load_for_klass(this, THREAD);
1021
1022 // Step 8
1023 {
1024 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
1025 // Timer includes any side effects of class initialization (resolution,
1026 // etc), but not recursive entry into call_class_initializer().
1027 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
1028 ClassLoader::perf_class_init_selftime(),
1029 ClassLoader::perf_classes_inited(),
1030 jt->get_thread_stat()->perf_recursion_counts_addr(),
1031 jt->get_thread_stat()->perf_timers_addr(),
1032 PerfClassTraceTime::CLASS_CLINIT);
1033 call_class_initializer(THREAD);
1034 }
1035
1036 // Step 9
1037 if (!HAS_PENDING_EXCEPTION) {
1038 set_initialization_state_and_notify(fully_initialized, CHECK);
1039 {
1040 debug_only(vtable().verify(tty, true);)
1041 }
1042 }
1043 else {
1044 // Step 10 and 11
1045 Handle e(THREAD, PENDING_EXCEPTION);
1046 CLEAR_PENDING_EXCEPTION;
1047 // JVMTI has already reported the pending exception
1048 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1049 JvmtiExport::clear_detected_exception(jt);
1050 {
1051 EXCEPTION_MARK;
1052 set_initialization_state_and_notify(initialization_error, THREAD);
1053 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below
1054 // JVMTI has already reported the pending exception
1055 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1056 JvmtiExport::clear_detected_exception(jt);
1057 }
1058 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
1059 if (e->is_a(SystemDictionary::Error_klass())) {
1060 THROW_OOP(e());
1061 } else {
1062 JavaCallArguments args(e);
1063 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
1064 vmSymbols::throwable_void_signature(),
1065 &args);
1066 }
1067 }
1068 DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait);
1069}
1070
1071
1072void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) {
1073 Handle h_init_lock(THREAD, init_lock());
1074 if (h_init_lock() != NULL) {
1075 ObjectLocker ol(h_init_lock, THREAD);
1076 set_init_thread(NULL); // reset _init_thread before changing _init_state
1077 set_init_state(state);
1078 fence_and_clear_init_lock();
1079 ol.notify_all(CHECK);
1080 } else {
1081 assert(h_init_lock() != NULL, "The initialization state should never be set twice");
1082 set_init_thread(NULL); // reset _init_thread before changing _init_state
1083 set_init_state(state);
1084 }
1085}
1086
1087Klass* InstanceKlass::implementor() const {
1088 Klass* volatile* k = adr_implementor();
1089 if (k == NULL) {
1090 return NULL;
1091 } else {
1092 // This load races with inserts, and therefore needs acquire.
1093 Klass* kls = OrderAccess::load_acquire(k);
1094 if (kls != NULL && !kls->is_loader_alive()) {
1095 return NULL; // don't return unloaded class
1096 } else {
1097 return kls;
1098 }
1099 }
1100}
1101
1102
1103void InstanceKlass::set_implementor(Klass* k) {
1104 assert_lock_strong(Compile_lock);
1105 assert(is_interface(), "not interface");
1106 Klass* volatile* addr = adr_implementor();
1107 assert(addr != NULL, "null addr");
1108 if (addr != NULL) {
1109 OrderAccess::release_store(addr, k);
1110 }
1111}
1112
1113int InstanceKlass::nof_implementors() const {
1114 Klass* k = implementor();
1115 if (k == NULL) {
1116 return 0;
1117 } else if (k != this) {
1118 return 1;
1119 } else {
1120 return 2;
1121 }
1122}
1123
1124// The embedded _implementor field can only record one implementor.
1125// When there are more than one implementors, the _implementor field
1126// is set to the interface Klass* itself. Following are the possible
1127// values for the _implementor field:
1128// NULL - no implementor
1129// implementor Klass* - one implementor
1130// self - more than one implementor
1131//
1132// The _implementor field only exists for interfaces.
1133void InstanceKlass::add_implementor(Klass* k) {
1134 assert_lock_strong(Compile_lock);
1135 assert(is_interface(), "not interface");
1136 // Filter out my subinterfaces.
1137 // (Note: Interfaces are never on the subklass list.)
1138 if (InstanceKlass::cast(k)->is_interface()) return;
1139
1140 // Filter out subclasses whose supers already implement me.
1141 // (Note: CHA must walk subclasses of direct implementors
1142 // in order to locate indirect implementors.)
1143 Klass* sk = k->super();
1144 if (sk != NULL && InstanceKlass::cast(sk)->implements_interface(this))
1145 // We only need to check one immediate superclass, since the
1146 // implements_interface query looks at transitive_interfaces.
1147 // Any supers of the super have the same (or fewer) transitive_interfaces.
1148 return;
1149
1150 Klass* ik = implementor();
1151 if (ik == NULL) {
1152 set_implementor(k);
1153 } else if (ik != this) {
1154 // There is already an implementor. Use itself as an indicator of
1155 // more than one implementors.
1156 set_implementor(this);
1157 }
1158
1159 // The implementor also implements the transitive_interfaces
1160 for (int index = 0; index < local_interfaces()->length(); index++) {
1161 InstanceKlass::cast(local_interfaces()->at(index))->add_implementor(k);
1162 }
1163}
1164
1165void InstanceKlass::init_implementor() {
1166 if (is_interface()) {
1167 set_implementor(NULL);
1168 }
1169}
1170
1171
1172void InstanceKlass::process_interfaces(Thread *thread) {
1173 // link this class into the implementors list of every interface it implements
1174 for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
1175 assert(local_interfaces()->at(i)->is_klass(), "must be a klass");
1176 InstanceKlass* interf = InstanceKlass::cast(local_interfaces()->at(i));
1177 assert(interf->is_interface(), "expected interface");
1178 interf->add_implementor(this);
1179 }
1180}
1181
1182bool InstanceKlass::can_be_primary_super_slow() const {
1183 if (is_interface())
1184 return false;
1185 else
1186 return Klass::can_be_primary_super_slow();
1187}
1188
1189GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots,
1190 Array<InstanceKlass*>* transitive_interfaces) {
1191 // The secondaries are the implemented interfaces.
1192 Array<InstanceKlass*>* interfaces = transitive_interfaces;
1193 int num_secondaries = num_extra_slots + interfaces->length();
1194 if (num_secondaries == 0) {
1195 // Must share this for correct bootstrapping!
1196 set_secondary_supers(Universe::the_empty_klass_array());
1197 return NULL;
1198 } else if (num_extra_slots == 0) {
1199 // The secondary super list is exactly the same as the transitive interfaces, so
1200 // let's use it instead of making a copy.
1201 // Redefine classes has to be careful not to delete this!
1202 // We need the cast because Array<Klass*> is NOT a supertype of Array<InstanceKlass*>,
1203 // (but it's safe to do here because we won't write into _secondary_supers from this point on).
1204 set_secondary_supers((Array<Klass*>*)(address)interfaces);
1205 return NULL;
1206 } else {
1207 // Copy transitive interfaces to a temporary growable array to be constructed
1208 // into the secondary super list with extra slots.
1209 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length());
1210 for (int i = 0; i < interfaces->length(); i++) {
1211 secondaries->push(interfaces->at(i));
1212 }
1213 return secondaries;
1214 }
1215}
1216
1217bool InstanceKlass::implements_interface(Klass* k) const {
1218 if (this == k) return true;
1219 assert(k->is_interface(), "should be an interface class");
1220 for (int i = 0; i < transitive_interfaces()->length(); i++) {
1221 if (transitive_interfaces()->at(i) == k) {
1222 return true;
1223 }
1224 }
1225 return false;
1226}
1227
1228bool InstanceKlass::is_same_or_direct_interface(Klass *k) const {
1229 // Verify direct super interface
1230 if (this == k) return true;
1231 assert(k->is_interface(), "should be an interface class");
1232 for (int i = 0; i < local_interfaces()->length(); i++) {
1233 if (local_interfaces()->at(i) == k) {
1234 return true;
1235 }
1236 }
1237 return false;
1238}
1239
1240objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) {
1241 check_array_allocation_length(length, arrayOopDesc::max_array_length(T_OBJECT), CHECK_NULL);
1242 int size = objArrayOopDesc::object_size(length);
1243 Klass* ak = array_klass(n, CHECK_NULL);
1244 objArrayOop o = (objArrayOop)Universe::heap()->array_allocate(ak, size, length,
1245 /* do_zero */ true, CHECK_NULL);
1246 return o;
1247}
1248
1249instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
1250 if (TraceFinalizerRegistration) {
1251 tty->print("Registered ");
1252 i->print_value_on(tty);
1253 tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", p2i(i));
1254 }
1255 instanceHandle h_i(THREAD, i);
1256 // Pass the handle as argument, JavaCalls::call expects oop as jobjects
1257 JavaValue result(T_VOID);
1258 JavaCallArguments args(h_i);
1259 methodHandle mh (THREAD, Universe::finalizer_register_method());
1260 JavaCalls::call(&result, mh, &args, CHECK_NULL);
1261 return h_i();
1262}
1263
1264instanceOop InstanceKlass::allocate_instance(TRAPS) {
1265 bool has_finalizer_flag = has_finalizer(); // Query before possible GC
1266 int size = size_helper(); // Query before forming handle.
1267
1268 instanceOop i;
1269
1270 i = (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL);
1271 if (has_finalizer_flag && !RegisterFinalizersAtInit) {
1272 i = register_finalizer(i, CHECK_NULL);
1273 }
1274 return i;
1275}
1276
1277instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) {
1278 return instanceHandle(THREAD, allocate_instance(THREAD));
1279}
1280
1281void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1282 if (is_interface() || is_abstract()) {
1283 ResourceMark rm(THREAD);
1284 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1285 : vmSymbols::java_lang_InstantiationException(), external_name());
1286 }
1287 if (this == SystemDictionary::Class_klass()) {
1288 ResourceMark rm(THREAD);
1289 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1290 : vmSymbols::java_lang_IllegalAccessException(), external_name());
1291 }
1292}
1293
1294Klass* InstanceKlass::array_klass_impl(bool or_null, int n, TRAPS) {
1295 // Need load-acquire for lock-free read
1296 if (array_klasses_acquire() == NULL) {
1297 if (or_null) return NULL;
1298
1299 ResourceMark rm;
1300 JavaThread *jt = (JavaThread *)THREAD;
1301 {
1302 // Atomic creation of array_klasses
1303 MutexLocker ma(MultiArray_lock, THREAD);
1304
1305 // Check if update has already taken place
1306 if (array_klasses() == NULL) {
1307 Klass* k = ObjArrayKlass::allocate_objArray_klass(class_loader_data(), 1, this, CHECK_NULL);
1308 // use 'release' to pair with lock-free load
1309 release_set_array_klasses(k);
1310 }
1311 }
1312 }
1313 // _this will always be set at this point
1314 ObjArrayKlass* oak = (ObjArrayKlass*)array_klasses();
1315 if (or_null) {
1316 return oak->array_klass_or_null(n);
1317 }
1318 return oak->array_klass(n, THREAD);
1319}
1320
1321Klass* InstanceKlass::array_klass_impl(bool or_null, TRAPS) {
1322 return array_klass_impl(or_null, 1, THREAD);
1323}
1324
1325static int call_class_initializer_counter = 0; // for debugging
1326
1327Method* InstanceKlass::class_initializer() const {
1328 Method* clinit = find_method(
1329 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1330 if (clinit != NULL && clinit->has_valid_initializer_flags()) {
1331 return clinit;
1332 }
1333 return NULL;
1334}
1335
1336void InstanceKlass::call_class_initializer(TRAPS) {
1337 if (ReplayCompiles &&
1338 (ReplaySuppressInitializers == 1 ||
1339 (ReplaySuppressInitializers >= 2 && class_loader() != NULL))) {
1340 // Hide the existence of the initializer for the purpose of replaying the compile
1341 return;
1342 }
1343
1344 methodHandle h_method(THREAD, class_initializer());
1345 assert(!is_initialized(), "we cannot initialize twice");
1346 LogTarget(Info, class, init) lt;
1347 if (lt.is_enabled()) {
1348 ResourceMark rm;
1349 LogStream ls(lt);
1350 ls.print("%d Initializing ", call_class_initializer_counter++);
1351 name()->print_value_on(&ls);
1352 ls.print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", p2i(this));
1353 }
1354 if (h_method() != NULL) {
1355 JavaCallArguments args; // No arguments
1356 JavaValue result(T_VOID);
1357 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1358 }
1359}
1360
1361
1362void InstanceKlass::mask_for(const methodHandle& method, int bci,
1363 InterpreterOopMap* entry_for) {
1364 // Lazily create the _oop_map_cache at first request
1365 // Lock-free access requires load_acquire.
1366 OopMapCache* oop_map_cache = OrderAccess::load_acquire(&_oop_map_cache);
1367 if (oop_map_cache == NULL) {
1368 MutexLocker x(OopMapCacheAlloc_lock);
1369 // Check if _oop_map_cache was allocated while we were waiting for this lock
1370 if ((oop_map_cache = _oop_map_cache) == NULL) {
1371 oop_map_cache = new OopMapCache();
1372 // Ensure _oop_map_cache is stable, since it is examined without a lock
1373 OrderAccess::release_store(&_oop_map_cache, oop_map_cache);
1374 }
1375 }
1376 // _oop_map_cache is constant after init; lookup below does its own locking.
1377 oop_map_cache->lookup(method, bci, entry_for);
1378}
1379
1380
1381bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1382 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1383 Symbol* f_name = fs.name();
1384 Symbol* f_sig = fs.signature();
1385 if (f_name == name && f_sig == sig) {
1386 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1387 return true;
1388 }
1389 }
1390 return false;
1391}
1392
1393
1394Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1395 const int n = local_interfaces()->length();
1396 for (int i = 0; i < n; i++) {
1397 Klass* intf1 = local_interfaces()->at(i);
1398 assert(intf1->is_interface(), "just checking type");
1399 // search for field in current interface
1400 if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) {
1401 assert(fd->is_static(), "interface field must be static");
1402 return intf1;
1403 }
1404 // search for field in direct superinterfaces
1405 Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd);
1406 if (intf2 != NULL) return intf2;
1407 }
1408 // otherwise field lookup fails
1409 return NULL;
1410}
1411
1412
1413Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1414 // search order according to newest JVM spec (5.4.3.2, p.167).
1415 // 1) search for field in current klass
1416 if (find_local_field(name, sig, fd)) {
1417 return const_cast<InstanceKlass*>(this);
1418 }
1419 // 2) search for field recursively in direct superinterfaces
1420 { Klass* intf = find_interface_field(name, sig, fd);
1421 if (intf != NULL) return intf;
1422 }
1423 // 3) apply field lookup recursively if superclass exists
1424 { Klass* supr = super();
1425 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, fd);
1426 }
1427 // 4) otherwise field lookup fails
1428 return NULL;
1429}
1430
1431
1432Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
1433 // search order according to newest JVM spec (5.4.3.2, p.167).
1434 // 1) search for field in current klass
1435 if (find_local_field(name, sig, fd)) {
1436 if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
1437 }
1438 // 2) search for field recursively in direct superinterfaces
1439 if (is_static) {
1440 Klass* intf = find_interface_field(name, sig, fd);
1441 if (intf != NULL) return intf;
1442 }
1443 // 3) apply field lookup recursively if superclass exists
1444 { Klass* supr = super();
1445 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd);
1446 }
1447 // 4) otherwise field lookup fails
1448 return NULL;
1449}
1450
1451
1452bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1453 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1454 if (fs.offset() == offset) {
1455 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1456 if (fd->is_static() == is_static) return true;
1457 }
1458 }
1459 return false;
1460}
1461
1462
1463bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1464 Klass* klass = const_cast<InstanceKlass*>(this);
1465 while (klass != NULL) {
1466 if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) {
1467 return true;
1468 }
1469 klass = klass->super();
1470 }
1471 return false;
1472}
1473
1474
1475void InstanceKlass::methods_do(void f(Method* method)) {
1476 // Methods aren't stable until they are loaded. This can be read outside
1477 // a lock through the ClassLoaderData for profiling
1478 if (!is_loaded()) {
1479 return;
1480 }
1481
1482 int len = methods()->length();
1483 for (int index = 0; index < len; index++) {
1484 Method* m = methods()->at(index);
1485 assert(m->is_method(), "must be method");
1486 f(m);
1487 }
1488}
1489
1490
1491void InstanceKlass::do_local_static_fields(FieldClosure* cl) {
1492 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1493 if (fs.access_flags().is_static()) {
1494 fieldDescriptor& fd = fs.field_descriptor();
1495 cl->do_field(&fd);
1496 }
1497 }
1498}
1499
1500
1501void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) {
1502 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1503 if (fs.access_flags().is_static()) {
1504 fieldDescriptor& fd = fs.field_descriptor();
1505 f(&fd, mirror, CHECK);
1506 }
1507 }
1508}
1509
1510
1511static int compare_fields_by_offset(int* a, int* b) {
1512 return a[0] - b[0];
1513}
1514
1515void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) {
1516 InstanceKlass* super = superklass();
1517 if (super != NULL) {
1518 super->do_nonstatic_fields(cl);
1519 }
1520 fieldDescriptor fd;
1521 int length = java_fields_count();
1522 // In DebugInfo nonstatic fields are sorted by offset.
1523 int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1), mtClass);
1524 int j = 0;
1525 for (int i = 0; i < length; i += 1) {
1526 fd.reinitialize(this, i);
1527 if (!fd.is_static()) {
1528 fields_sorted[j + 0] = fd.offset();
1529 fields_sorted[j + 1] = i;
1530 j += 2;
1531 }
1532 }
1533 if (j > 0) {
1534 length = j;
1535 // _sort_Fn is defined in growableArray.hpp.
1536 qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset);
1537 for (int i = 0; i < length; i += 2) {
1538 fd.reinitialize(this, fields_sorted[i + 1]);
1539 assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields");
1540 cl->do_field(&fd);
1541 }
1542 }
1543 FREE_C_HEAP_ARRAY(int, fields_sorted);
1544}
1545
1546
1547void InstanceKlass::array_klasses_do(void f(Klass* k, TRAPS), TRAPS) {
1548 if (array_klasses() != NULL)
1549 ArrayKlass::cast(array_klasses())->array_klasses_do(f, THREAD);
1550}
1551
1552void InstanceKlass::array_klasses_do(void f(Klass* k)) {
1553 if (array_klasses() != NULL)
1554 ArrayKlass::cast(array_klasses())->array_klasses_do(f);
1555}
1556
1557#ifdef ASSERT
1558static int linear_search(const Array<Method*>* methods,
1559 const Symbol* name,
1560 const Symbol* signature) {
1561 const int len = methods->length();
1562 for (int index = 0; index < len; index++) {
1563 const Method* const m = methods->at(index);
1564 assert(m->is_method(), "must be method");
1565 if (m->signature() == signature && m->name() == name) {
1566 return index;
1567 }
1568 }
1569 return -1;
1570}
1571#endif
1572
1573static int binary_search(const Array<Method*>* methods, const Symbol* name) {
1574 int len = methods->length();
1575 // methods are sorted, so do binary search
1576 int l = 0;
1577 int h = len - 1;
1578 while (l <= h) {
1579 int mid = (l + h) >> 1;
1580 Method* m = methods->at(mid);
1581 assert(m->is_method(), "must be method");
1582 int res = m->name()->fast_compare(name);
1583 if (res == 0) {
1584 return mid;
1585 } else if (res < 0) {
1586 l = mid + 1;
1587 } else {
1588 h = mid - 1;
1589 }
1590 }
1591 return -1;
1592}
1593
1594// find_method looks up the name/signature in the local methods array
1595Method* InstanceKlass::find_method(const Symbol* name,
1596 const Symbol* signature) const {
1597 return find_method_impl(name, signature, find_overpass, find_static, find_private);
1598}
1599
1600Method* InstanceKlass::find_method_impl(const Symbol* name,
1601 const Symbol* signature,
1602 OverpassLookupMode overpass_mode,
1603 StaticLookupMode static_mode,
1604 PrivateLookupMode private_mode) const {
1605 return InstanceKlass::find_method_impl(methods(),
1606 name,
1607 signature,
1608 overpass_mode,
1609 static_mode,
1610 private_mode);
1611}
1612
1613// find_instance_method looks up the name/signature in the local methods array
1614// and skips over static methods
1615Method* InstanceKlass::find_instance_method(const Array<Method*>* methods,
1616 const Symbol* name,
1617 const Symbol* signature,
1618 PrivateLookupMode private_mode) {
1619 Method* const meth = InstanceKlass::find_method_impl(methods,
1620 name,
1621 signature,
1622 find_overpass,
1623 skip_static,
1624 private_mode);
1625 assert(((meth == NULL) || !meth->is_static()),
1626 "find_instance_method should have skipped statics");
1627 return meth;
1628}
1629
1630// find_instance_method looks up the name/signature in the local methods array
1631// and skips over static methods
1632Method* InstanceKlass::find_instance_method(const Symbol* name,
1633 const Symbol* signature,
1634 PrivateLookupMode private_mode) const {
1635 return InstanceKlass::find_instance_method(methods(), name, signature, private_mode);
1636}
1637
1638// Find looks up the name/signature in the local methods array
1639// and filters on the overpass, static and private flags
1640// This returns the first one found
1641// note that the local methods array can have up to one overpass, one static
1642// and one instance (private or not) with the same name/signature
1643Method* InstanceKlass::find_local_method(const Symbol* name,
1644 const Symbol* signature,
1645 OverpassLookupMode overpass_mode,
1646 StaticLookupMode static_mode,
1647 PrivateLookupMode private_mode) const {
1648 return InstanceKlass::find_method_impl(methods(),
1649 name,
1650 signature,
1651 overpass_mode,
1652 static_mode,
1653 private_mode);
1654}
1655
1656// Find looks up the name/signature in the local methods array
1657// and filters on the overpass, static and private flags
1658// This returns the first one found
1659// note that the local methods array can have up to one overpass, one static
1660// and one instance (private or not) with the same name/signature
1661Method* InstanceKlass::find_local_method(const Array<Method*>* methods,
1662 const Symbol* name,
1663 const Symbol* signature,
1664 OverpassLookupMode overpass_mode,
1665 StaticLookupMode static_mode,
1666 PrivateLookupMode private_mode) {
1667 return InstanceKlass::find_method_impl(methods,
1668 name,
1669 signature,
1670 overpass_mode,
1671 static_mode,
1672 private_mode);
1673}
1674
1675Method* InstanceKlass::find_method(const Array<Method*>* methods,
1676 const Symbol* name,
1677 const Symbol* signature) {
1678 return InstanceKlass::find_method_impl(methods,
1679 name,
1680 signature,
1681 find_overpass,
1682 find_static,
1683 find_private);
1684}
1685
1686Method* InstanceKlass::find_method_impl(const Array<Method*>* methods,
1687 const Symbol* name,
1688 const Symbol* signature,
1689 OverpassLookupMode overpass_mode,
1690 StaticLookupMode static_mode,
1691 PrivateLookupMode private_mode) {
1692 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode);
1693 return hit >= 0 ? methods->at(hit): NULL;
1694}
1695
1696// true if method matches signature and conforms to skipping_X conditions.
1697static bool method_matches(const Method* m,
1698 const Symbol* signature,
1699 bool skipping_overpass,
1700 bool skipping_static,
1701 bool skipping_private) {
1702 return ((m->signature() == signature) &&
1703 (!skipping_overpass || !m->is_overpass()) &&
1704 (!skipping_static || !m->is_static()) &&
1705 (!skipping_private || !m->is_private()));
1706}
1707
1708// Used directly for default_methods to find the index into the
1709// default_vtable_indices, and indirectly by find_method
1710// find_method_index looks in the local methods array to return the index
1711// of the matching name/signature. If, overpass methods are being ignored,
1712// the search continues to find a potential non-overpass match. This capability
1713// is important during method resolution to prefer a static method, for example,
1714// over an overpass method.
1715// There is the possibility in any _method's array to have the same name/signature
1716// for a static method, an overpass method and a local instance method
1717// To correctly catch a given method, the search criteria may need
1718// to explicitly skip the other two. For local instance methods, it
1719// is often necessary to skip private methods
1720int InstanceKlass::find_method_index(const Array<Method*>* methods,
1721 const Symbol* name,
1722 const Symbol* signature,
1723 OverpassLookupMode overpass_mode,
1724 StaticLookupMode static_mode,
1725 PrivateLookupMode private_mode) {
1726 const bool skipping_overpass = (overpass_mode == skip_overpass);
1727 const bool skipping_static = (static_mode == skip_static);
1728 const bool skipping_private = (private_mode == skip_private);
1729 const int hit = binary_search(methods, name);
1730 if (hit != -1) {
1731 const Method* const m = methods->at(hit);
1732
1733 // Do linear search to find matching signature. First, quick check
1734 // for common case, ignoring overpasses if requested.
1735 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1736 return hit;
1737 }
1738
1739 // search downwards through overloaded methods
1740 int i;
1741 for (i = hit - 1; i >= 0; --i) {
1742 const Method* const m = methods->at(i);
1743 assert(m->is_method(), "must be method");
1744 if (m->name() != name) {
1745 break;
1746 }
1747 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1748 return i;
1749 }
1750 }
1751 // search upwards
1752 for (i = hit + 1; i < methods->length(); ++i) {
1753 const Method* const m = methods->at(i);
1754 assert(m->is_method(), "must be method");
1755 if (m->name() != name) {
1756 break;
1757 }
1758 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1759 return i;
1760 }
1761 }
1762 // not found
1763#ifdef ASSERT
1764 const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 :
1765 linear_search(methods, name, signature);
1766 assert(-1 == index, "binary search should have found entry %d", index);
1767#endif
1768 }
1769 return -1;
1770}
1771
1772int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const {
1773 return find_method_by_name(methods(), name, end);
1774}
1775
1776int InstanceKlass::find_method_by_name(const Array<Method*>* methods,
1777 const Symbol* name,
1778 int* end_ptr) {
1779 assert(end_ptr != NULL, "just checking");
1780 int start = binary_search(methods, name);
1781 int end = start + 1;
1782 if (start != -1) {
1783 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
1784 while (end < methods->length() && (methods->at(end))->name() == name) ++end;
1785 *end_ptr = end;
1786 return start;
1787 }
1788 return -1;
1789}
1790
1791// uncached_lookup_method searches both the local class methods array and all
1792// superclasses methods arrays, skipping any overpass methods in superclasses,
1793// and possibly skipping private methods.
1794Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
1795 const Symbol* signature,
1796 OverpassLookupMode overpass_mode,
1797 PrivateLookupMode private_mode) const {
1798 OverpassLookupMode overpass_local_mode = overpass_mode;
1799 const Klass* klass = this;
1800 while (klass != NULL) {
1801 Method* const method = InstanceKlass::cast(klass)->find_method_impl(name,
1802 signature,
1803 overpass_local_mode,
1804 find_static,
1805 private_mode);
1806 if (method != NULL) {
1807 return method;
1808 }
1809 klass = klass->super();
1810 overpass_local_mode = skip_overpass; // Always ignore overpass methods in superclasses
1811 }
1812 return NULL;
1813}
1814
1815#ifdef ASSERT
1816// search through class hierarchy and return true if this class or
1817// one of the superclasses was redefined
1818bool InstanceKlass::has_redefined_this_or_super() const {
1819 const Klass* klass = this;
1820 while (klass != NULL) {
1821 if (InstanceKlass::cast(klass)->has_been_redefined()) {
1822 return true;
1823 }
1824 klass = klass->super();
1825 }
1826 return false;
1827}
1828#endif
1829
1830// lookup a method in the default methods list then in all transitive interfaces
1831// Do NOT return private or static methods
1832Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
1833 Symbol* signature) const {
1834 Method* m = NULL;
1835 if (default_methods() != NULL) {
1836 m = find_method(default_methods(), name, signature);
1837 }
1838 // Look up interfaces
1839 if (m == NULL) {
1840 m = lookup_method_in_all_interfaces(name, signature, find_defaults);
1841 }
1842 return m;
1843}
1844
1845// lookup a method in all the interfaces that this class implements
1846// Do NOT return private or static methods, new in JDK8 which are not externally visible
1847// They should only be found in the initial InterfaceMethodRef
1848Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
1849 Symbol* signature,
1850 DefaultsLookupMode defaults_mode) const {
1851 Array<InstanceKlass*>* all_ifs = transitive_interfaces();
1852 int num_ifs = all_ifs->length();
1853 InstanceKlass *ik = NULL;
1854 for (int i = 0; i < num_ifs; i++) {
1855 ik = all_ifs->at(i);
1856 Method* m = ik->lookup_method(name, signature);
1857 if (m != NULL && m->is_public() && !m->is_static() &&
1858 ((defaults_mode != skip_defaults) || !m->is_default_method())) {
1859 return m;
1860 }
1861 }
1862 return NULL;
1863}
1864
1865/* jni_id_for_impl for jfieldIds only */
1866JNIid* InstanceKlass::jni_id_for_impl(int offset) {
1867 MutexLocker ml(JfieldIdCreation_lock);
1868 // Retry lookup after we got the lock
1869 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
1870 if (probe == NULL) {
1871 // Slow case, allocate new static field identifier
1872 probe = new JNIid(this, offset, jni_ids());
1873 set_jni_ids(probe);
1874 }
1875 return probe;
1876}
1877
1878
1879/* jni_id_for for jfieldIds only */
1880JNIid* InstanceKlass::jni_id_for(int offset) {
1881 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
1882 if (probe == NULL) {
1883 probe = jni_id_for_impl(offset);
1884 }
1885 return probe;
1886}
1887
1888u2 InstanceKlass::enclosing_method_data(int offset) const {
1889 const Array<jushort>* const inner_class_list = inner_classes();
1890 if (inner_class_list == NULL) {
1891 return 0;
1892 }
1893 const int length = inner_class_list->length();
1894 if (length % inner_class_next_offset == 0) {
1895 return 0;
1896 }
1897 const int index = length - enclosing_method_attribute_size;
1898 assert(offset < enclosing_method_attribute_size, "invalid offset");
1899 return inner_class_list->at(index + offset);
1900}
1901
1902void InstanceKlass::set_enclosing_method_indices(u2 class_index,
1903 u2 method_index) {
1904 Array<jushort>* inner_class_list = inner_classes();
1905 assert (inner_class_list != NULL, "_inner_classes list is not set up");
1906 int length = inner_class_list->length();
1907 if (length % inner_class_next_offset == enclosing_method_attribute_size) {
1908 int index = length - enclosing_method_attribute_size;
1909 inner_class_list->at_put(
1910 index + enclosing_method_class_index_offset, class_index);
1911 inner_class_list->at_put(
1912 index + enclosing_method_method_index_offset, method_index);
1913 }
1914}
1915
1916// Lookup or create a jmethodID.
1917// This code is called by the VMThread and JavaThreads so the
1918// locking has to be done very carefully to avoid deadlocks
1919// and/or other cache consistency problems.
1920//
1921jmethodID InstanceKlass::get_jmethod_id(const methodHandle& method_h) {
1922 size_t idnum = (size_t)method_h->method_idnum();
1923 jmethodID* jmeths = methods_jmethod_ids_acquire();
1924 size_t length = 0;
1925 jmethodID id = NULL;
1926
1927 // We use a double-check locking idiom here because this cache is
1928 // performance sensitive. In the normal system, this cache only
1929 // transitions from NULL to non-NULL which is safe because we use
1930 // release_set_methods_jmethod_ids() to advertise the new cache.
1931 // A partially constructed cache should never be seen by a racing
1932 // thread. We also use release_store() to save a new jmethodID
1933 // in the cache so a partially constructed jmethodID should never be
1934 // seen either. Cache reads of existing jmethodIDs proceed without a
1935 // lock, but cache writes of a new jmethodID requires uniqueness and
1936 // creation of the cache itself requires no leaks so a lock is
1937 // generally acquired in those two cases.
1938 //
1939 // If the RedefineClasses() API has been used, then this cache can
1940 // grow and we'll have transitions from non-NULL to bigger non-NULL.
1941 // Cache creation requires no leaks and we require safety between all
1942 // cache accesses and freeing of the old cache so a lock is generally
1943 // acquired when the RedefineClasses() API has been used.
1944
1945 if (jmeths != NULL) {
1946 // the cache already exists
1947 if (!idnum_can_increment()) {
1948 // the cache can't grow so we can just get the current values
1949 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
1950 } else {
1951 // cache can grow so we have to be more careful
1952 if (Threads::number_of_threads() == 0 ||
1953 SafepointSynchronize::is_at_safepoint()) {
1954 // we're single threaded or at a safepoint - no locking needed
1955 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
1956 } else {
1957 MutexLocker ml(JmethodIdCreation_lock);
1958 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
1959 }
1960 }
1961 }
1962 // implied else:
1963 // we need to allocate a cache so default length and id values are good
1964
1965 if (jmeths == NULL || // no cache yet
1966 length <= idnum || // cache is too short
1967 id == NULL) { // cache doesn't contain entry
1968
1969 // This function can be called by the VMThread so we have to do all
1970 // things that might block on a safepoint before grabbing the lock.
1971 // Otherwise, we can deadlock with the VMThread or have a cache
1972 // consistency issue. These vars keep track of what we might have
1973 // to free after the lock is dropped.
1974 jmethodID to_dealloc_id = NULL;
1975 jmethodID* to_dealloc_jmeths = NULL;
1976
1977 // may not allocate new_jmeths or use it if we allocate it
1978 jmethodID* new_jmeths = NULL;
1979 if (length <= idnum) {
1980 // allocate a new cache that might be used
1981 size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count());
1982 new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1, mtClass);
1983 memset(new_jmeths, 0, (size+1)*sizeof(jmethodID));
1984 // cache size is stored in element[0], other elements offset by one
1985 new_jmeths[0] = (jmethodID)size;
1986 }
1987
1988 // allocate a new jmethodID that might be used
1989 jmethodID new_id = NULL;
1990 if (method_h->is_old() && !method_h->is_obsolete()) {
1991 // The method passed in is old (but not obsolete), we need to use the current version
1992 Method* current_method = method_with_idnum((int)idnum);
1993 assert(current_method != NULL, "old and but not obsolete, so should exist");
1994 new_id = Method::make_jmethod_id(class_loader_data(), current_method);
1995 } else {
1996 // It is the current version of the method or an obsolete method,
1997 // use the version passed in
1998 new_id = Method::make_jmethod_id(class_loader_data(), method_h());
1999 }
2000
2001 if (Threads::number_of_threads() == 0 ||
2002 SafepointSynchronize::is_at_safepoint()) {
2003 // we're single threaded or at a safepoint - no locking needed
2004 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2005 &to_dealloc_id, &to_dealloc_jmeths);
2006 } else {
2007 MutexLocker ml(JmethodIdCreation_lock);
2008 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2009 &to_dealloc_id, &to_dealloc_jmeths);
2010 }
2011
2012 // The lock has been dropped so we can free resources.
2013 // Free up either the old cache or the new cache if we allocated one.
2014 if (to_dealloc_jmeths != NULL) {
2015 FreeHeap(to_dealloc_jmeths);
2016 }
2017 // free up the new ID since it wasn't needed
2018 if (to_dealloc_id != NULL) {
2019 Method::destroy_jmethod_id(class_loader_data(), to_dealloc_id);
2020 }
2021 }
2022 return id;
2023}
2024
2025// Figure out how many jmethodIDs haven't been allocated, and make
2026// sure space for them is pre-allocated. This makes getting all
2027// method ids much, much faster with classes with more than 8
2028// methods, and has a *substantial* effect on performance with jvmti
2029// code that loads all jmethodIDs for all classes.
2030void InstanceKlass::ensure_space_for_methodids(int start_offset) {
2031 int new_jmeths = 0;
2032 int length = methods()->length();
2033 for (int index = start_offset; index < length; index++) {
2034 Method* m = methods()->at(index);
2035 jmethodID id = m->find_jmethod_id_or_null();
2036 if (id == NULL) {
2037 new_jmeths++;
2038 }
2039 }
2040 if (new_jmeths != 0) {
2041 Method::ensure_jmethod_ids(class_loader_data(), new_jmeths);
2042 }
2043}
2044
2045// Common code to fetch the jmethodID from the cache or update the
2046// cache with the new jmethodID. This function should never do anything
2047// that causes the caller to go to a safepoint or we can deadlock with
2048// the VMThread or have cache consistency issues.
2049//
2050jmethodID InstanceKlass::get_jmethod_id_fetch_or_update(
2051 size_t idnum, jmethodID new_id,
2052 jmethodID* new_jmeths, jmethodID* to_dealloc_id_p,
2053 jmethodID** to_dealloc_jmeths_p) {
2054 assert(new_id != NULL, "sanity check");
2055 assert(to_dealloc_id_p != NULL, "sanity check");
2056 assert(to_dealloc_jmeths_p != NULL, "sanity check");
2057 assert(Threads::number_of_threads() == 0 ||
2058 SafepointSynchronize::is_at_safepoint() ||
2059 JmethodIdCreation_lock->owned_by_self(), "sanity check");
2060
2061 // reacquire the cache - we are locked, single threaded or at a safepoint
2062 jmethodID* jmeths = methods_jmethod_ids_acquire();
2063 jmethodID id = NULL;
2064 size_t length = 0;
2065
2066 if (jmeths == NULL || // no cache yet
2067 (length = (size_t)jmeths[0]) <= idnum) { // cache is too short
2068 if (jmeths != NULL) {
2069 // copy any existing entries from the old cache
2070 for (size_t index = 0; index < length; index++) {
2071 new_jmeths[index+1] = jmeths[index+1];
2072 }
2073 *to_dealloc_jmeths_p = jmeths; // save old cache for later delete
2074 }
2075 release_set_methods_jmethod_ids(jmeths = new_jmeths);
2076 } else {
2077 // fetch jmethodID (if any) from the existing cache
2078 id = jmeths[idnum+1];
2079 *to_dealloc_jmeths_p = new_jmeths; // save new cache for later delete
2080 }
2081 if (id == NULL) {
2082 // No matching jmethodID in the existing cache or we have a new
2083 // cache or we just grew the cache. This cache write is done here
2084 // by the first thread to win the foot race because a jmethodID
2085 // needs to be unique once it is generally available.
2086 id = new_id;
2087
2088 // The jmethodID cache can be read while unlocked so we have to
2089 // make sure the new jmethodID is complete before installing it
2090 // in the cache.
2091 OrderAccess::release_store(&jmeths[idnum+1], id);
2092 } else {
2093 *to_dealloc_id_p = new_id; // save new id for later delete
2094 }
2095 return id;
2096}
2097
2098
2099// Common code to get the jmethodID cache length and the jmethodID
2100// value at index idnum if there is one.
2101//
2102void InstanceKlass::get_jmethod_id_length_value(jmethodID* cache,
2103 size_t idnum, size_t *length_p, jmethodID* id_p) {
2104 assert(cache != NULL, "sanity check");
2105 assert(length_p != NULL, "sanity check");
2106 assert(id_p != NULL, "sanity check");
2107
2108 // cache size is stored in element[0], other elements offset by one
2109 *length_p = (size_t)cache[0];
2110 if (*length_p <= idnum) { // cache is too short
2111 *id_p = NULL;
2112 } else {
2113 *id_p = cache[idnum+1]; // fetch jmethodID (if any)
2114 }
2115}
2116
2117
2118// Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles
2119jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
2120 size_t idnum = (size_t)method->method_idnum();
2121 jmethodID* jmeths = methods_jmethod_ids_acquire();
2122 size_t length; // length assigned as debugging crumb
2123 jmethodID id = NULL;
2124 if (jmeths != NULL && // If there is a cache
2125 (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough,
2126 id = jmeths[idnum+1]; // Look up the id (may be NULL)
2127 }
2128 return id;
2129}
2130
2131inline DependencyContext InstanceKlass::dependencies() {
2132 DependencyContext dep_context(&_dep_context, &_dep_context_last_cleaned);
2133 return dep_context;
2134}
2135
2136int InstanceKlass::mark_dependent_nmethods(KlassDepChange& changes) {
2137 return dependencies().mark_dependent_nmethods(changes);
2138}
2139
2140void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
2141 dependencies().add_dependent_nmethod(nm);
2142}
2143
2144void InstanceKlass::remove_dependent_nmethod(nmethod* nm) {
2145 dependencies().remove_dependent_nmethod(nm);
2146}
2147
2148void InstanceKlass::clean_dependency_context() {
2149 dependencies().clean_unloading_dependents();
2150}
2151
2152#ifndef PRODUCT
2153void InstanceKlass::print_dependent_nmethods(bool verbose) {
2154 dependencies().print_dependent_nmethods(verbose);
2155}
2156
2157bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
2158 return dependencies().is_dependent_nmethod(nm);
2159}
2160#endif //PRODUCT
2161
2162void InstanceKlass::clean_weak_instanceklass_links() {
2163 clean_implementors_list();
2164 clean_method_data();
2165}
2166
2167void InstanceKlass::clean_implementors_list() {
2168 assert(is_loader_alive(), "this klass should be live");
2169 if (is_interface()) {
2170 assert (ClassUnloading, "only called for ClassUnloading");
2171 for (;;) {
2172 // Use load_acquire due to competing with inserts
2173 Klass* impl = OrderAccess::load_acquire(adr_implementor());
2174 if (impl != NULL && !impl->is_loader_alive()) {
2175 // NULL this field, might be an unloaded klass or NULL
2176 Klass* volatile* klass = adr_implementor();
2177 if (Atomic::cmpxchg((Klass*)NULL, klass, impl) == impl) {
2178 // Successfully unlinking implementor.
2179 if (log_is_enabled(Trace, class, unload)) {
2180 ResourceMark rm;
2181 log_trace(class, unload)("unlinking class (implementor): %s", impl->external_name());
2182 }
2183 return;
2184 }
2185 } else {
2186 return;
2187 }
2188 }
2189 }
2190}
2191
2192void InstanceKlass::clean_method_data() {
2193 for (int m = 0; m < methods()->length(); m++) {
2194 MethodData* mdo = methods()->at(m)->method_data();
2195 if (mdo != NULL) {
2196 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : mdo->extra_data_lock());
2197 mdo->clean_method_data(/*always_clean*/false);
2198 }
2199 }
2200}
2201
2202bool InstanceKlass::supers_have_passed_fingerprint_checks() {
2203 if (java_super() != NULL && !java_super()->has_passed_fingerprint_check()) {
2204 ResourceMark rm;
2205 log_trace(class, fingerprint)("%s : super %s not fingerprinted", external_name(), java_super()->external_name());
2206 return false;
2207 }
2208
2209 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
2210 if (local_interfaces != NULL) {
2211 int length = local_interfaces->length();
2212 for (int i = 0; i < length; i++) {
2213 InstanceKlass* intf = local_interfaces->at(i);
2214 if (!intf->has_passed_fingerprint_check()) {
2215 ResourceMark rm;
2216 log_trace(class, fingerprint)("%s : interface %s not fingerprinted", external_name(), intf->external_name());
2217 return false;
2218 }
2219 }
2220 }
2221
2222 return true;
2223}
2224
2225bool InstanceKlass::should_store_fingerprint(bool is_unsafe_anonymous) {
2226#if INCLUDE_AOT
2227 // We store the fingerprint into the InstanceKlass only in the following 2 cases:
2228 if (CalculateClassFingerprint) {
2229 // (1) We are running AOT to generate a shared library.
2230 return true;
2231 }
2232 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
2233 // (2) We are running -Xshare:dump or -XX:ArchiveClassesAtExit to create a shared archive
2234 return true;
2235 }
2236 if (UseAOT && is_unsafe_anonymous) {
2237 // (3) We are using AOT code from a shared library and see an unsafe anonymous class
2238 return true;
2239 }
2240#endif
2241
2242 // In all other cases we might set the _misc_has_passed_fingerprint_check bit,
2243 // but do not store the 64-bit fingerprint to save space.
2244 return false;
2245}
2246
2247bool InstanceKlass::has_stored_fingerprint() const {
2248#if INCLUDE_AOT
2249 return should_store_fingerprint() || is_shared();
2250#else
2251 return false;
2252#endif
2253}
2254
2255uint64_t InstanceKlass::get_stored_fingerprint() const {
2256 address adr = adr_fingerprint();
2257 if (adr != NULL) {
2258 return (uint64_t)Bytes::get_native_u8(adr); // adr may not be 64-bit aligned
2259 }
2260 return 0;
2261}
2262
2263void InstanceKlass::store_fingerprint(uint64_t fingerprint) {
2264 address adr = adr_fingerprint();
2265 if (adr != NULL) {
2266 Bytes::put_native_u8(adr, (u8)fingerprint); // adr may not be 64-bit aligned
2267
2268 ResourceMark rm;
2269 log_trace(class, fingerprint)("stored as " PTR64_FORMAT " for class %s", fingerprint, external_name());
2270 }
2271}
2272
2273void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) {
2274 Klass::metaspace_pointers_do(it);
2275
2276 if (log_is_enabled(Trace, cds)) {
2277 ResourceMark rm;
2278 log_trace(cds)("Iter(InstanceKlass): %p (%s)", this, external_name());
2279 }
2280
2281 it->push(&_annotations);
2282 it->push((Klass**)&_array_klasses);
2283 it->push(&_constants);
2284 it->push(&_inner_classes);
2285 it->push(&_array_name);
2286#if INCLUDE_JVMTI
2287 it->push(&_previous_versions);
2288#endif
2289 it->push(&_methods);
2290 it->push(&_default_methods);
2291 it->push(&_local_interfaces);
2292 it->push(&_transitive_interfaces);
2293 it->push(&_method_ordering);
2294 it->push(&_default_vtable_indices);
2295 it->push(&_fields);
2296
2297 if (itable_length() > 0) {
2298 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2299 int method_table_offset_in_words = ioe->offset()/wordSize;
2300 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
2301 / itableOffsetEntry::size();
2302
2303 for (int i = 0; i < nof_interfaces; i ++, ioe ++) {
2304 if (ioe->interface_klass() != NULL) {
2305 it->push(ioe->interface_klass_addr());
2306 itableMethodEntry* ime = ioe->first_method_entry(this);
2307 int n = klassItable::method_count_for_interface(ioe->interface_klass());
2308 for (int index = 0; index < n; index ++) {
2309 it->push(ime[index].method_addr());
2310 }
2311 }
2312 }
2313 }
2314
2315 it->push(&_nest_members);
2316}
2317
2318void InstanceKlass::remove_unshareable_info() {
2319 Klass::remove_unshareable_info();
2320
2321 if (is_in_error_state()) {
2322 // Classes are attempted to link during dumping and may fail,
2323 // but these classes are still in the dictionary and class list in CLD.
2324 // Check in_error state first because in_error is > linked state, so
2325 // is_linked() is true.
2326 // If there's a linking error, there is nothing else to remove.
2327 return;
2328 }
2329
2330 // Reset to the 'allocated' state to prevent any premature accessing to
2331 // a shared class at runtime while the class is still being loaded and
2332 // restored. A class' init_state is set to 'loaded' at runtime when it's
2333 // being added to class hierarchy (see SystemDictionary:::add_to_hierarchy()).
2334 _init_state = allocated;
2335
2336 {
2337 MutexLocker ml(Compile_lock);
2338 init_implementor();
2339 }
2340
2341 constants()->remove_unshareable_info();
2342
2343 for (int i = 0; i < methods()->length(); i++) {
2344 Method* m = methods()->at(i);
2345 m->remove_unshareable_info();
2346 }
2347
2348 // do array classes also.
2349 if (array_klasses() != NULL) {
2350 array_klasses()->remove_unshareable_info();
2351 }
2352
2353 // These are not allocated from metaspace. They are safe to set to NULL.
2354 _source_debug_extension = NULL;
2355 _dep_context = NULL;
2356 _osr_nmethods_head = NULL;
2357#if INCLUDE_JVMTI
2358 _breakpoints = NULL;
2359 _previous_versions = NULL;
2360 _cached_class_file = NULL;
2361#endif
2362
2363 _init_thread = NULL;
2364 _methods_jmethod_ids = NULL;
2365 _jni_ids = NULL;
2366 _oop_map_cache = NULL;
2367 // clear _nest_host to ensure re-load at runtime
2368 _nest_host = NULL;
2369}
2370
2371void InstanceKlass::remove_java_mirror() {
2372 Klass::remove_java_mirror();
2373
2374 // do array classes also.
2375 if (array_klasses() != NULL) {
2376 array_klasses()->remove_java_mirror();
2377 }
2378}
2379
2380void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) {
2381 // SystemDictionary::add_to_hierarchy() sets the init_state to loaded
2382 // before the InstanceKlass is added to the SystemDictionary. Make
2383 // sure the current state is <loaded.
2384 assert(!is_loaded(), "invalid init state");
2385 set_package(loader_data, CHECK);
2386 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
2387
2388 Array<Method*>* methods = this->methods();
2389 int num_methods = methods->length();
2390 for (int index = 0; index < num_methods; ++index) {
2391 methods->at(index)->restore_unshareable_info(CHECK);
2392 }
2393 if (JvmtiExport::has_redefined_a_class()) {
2394 // Reinitialize vtable because RedefineClasses may have changed some
2395 // entries in this vtable for super classes so the CDS vtable might
2396 // point to old or obsolete entries. RedefineClasses doesn't fix up
2397 // vtables in the shared system dictionary, only the main one.
2398 // It also redefines the itable too so fix that too.
2399 vtable().initialize_vtable(false, CHECK);
2400 itable().initialize_itable(false, CHECK);
2401 }
2402
2403 // restore constant pool resolved references
2404 constants()->restore_unshareable_info(CHECK);
2405
2406 if (array_klasses() != NULL) {
2407 // Array classes have null protection domain.
2408 // --> see ArrayKlass::complete_create_array_klass()
2409 array_klasses()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
2410 }
2411}
2412
2413// returns true IFF is_in_error_state() has been changed as a result of this call.
2414bool InstanceKlass::check_sharing_error_state() {
2415 assert(DumpSharedSpaces, "should only be called during dumping");
2416 bool old_state = is_in_error_state();
2417
2418 if (!is_in_error_state()) {
2419 bool bad = false;
2420 for (InstanceKlass* sup = java_super(); sup; sup = sup->java_super()) {
2421 if (sup->is_in_error_state()) {
2422 bad = true;
2423 break;
2424 }
2425 }
2426 if (!bad) {
2427 Array<InstanceKlass*>* interfaces = transitive_interfaces();
2428 for (int i = 0; i < interfaces->length(); i++) {
2429 InstanceKlass* iface = interfaces->at(i);
2430 if (iface->is_in_error_state()) {
2431 bad = true;
2432 break;
2433 }
2434 }
2435 }
2436
2437 if (bad) {
2438 set_in_error_state();
2439 }
2440 }
2441
2442 return (old_state != is_in_error_state());
2443}
2444
2445void InstanceKlass::set_class_loader_type(s2 loader_type) {
2446 switch (loader_type) {
2447 case ClassLoader::BOOT_LOADER:
2448 _misc_flags |= _misc_is_shared_boot_class;
2449 break;
2450 case ClassLoader::PLATFORM_LOADER:
2451 _misc_flags |= _misc_is_shared_platform_class;
2452 break;
2453 case ClassLoader::APP_LOADER:
2454 _misc_flags |= _misc_is_shared_app_class;
2455 break;
2456 default:
2457 ShouldNotReachHere();
2458 break;
2459 }
2460}
2461
2462#if INCLUDE_JVMTI
2463static void clear_all_breakpoints(Method* m) {
2464 m->clear_all_breakpoints();
2465}
2466#endif
2467
2468void InstanceKlass::unload_class(InstanceKlass* ik) {
2469 // Release dependencies.
2470 ik->dependencies().remove_all_dependents();
2471
2472 // notify the debugger
2473 if (JvmtiExport::should_post_class_unload()) {
2474 JvmtiExport::post_class_unload(ik);
2475 }
2476
2477 // notify ClassLoadingService of class unload
2478 ClassLoadingService::notify_class_unloaded(ik);
2479
2480 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
2481 SystemDictionaryShared::remove_dumptime_info(ik);
2482 }
2483
2484 if (log_is_enabled(Info, class, unload)) {
2485 ResourceMark rm;
2486 log_info(class, unload)("unloading class %s " INTPTR_FORMAT, ik->external_name(), p2i(ik));
2487 }
2488
2489 Events::log_class_unloading(Thread::current(), ik);
2490
2491#if INCLUDE_JFR
2492 assert(ik != NULL, "invariant");
2493 EventClassUnload event;
2494 event.set_unloadedClass(ik);
2495 event.set_definingClassLoader(ik->class_loader_data());
2496 event.commit();
2497#endif
2498}
2499
2500void InstanceKlass::release_C_heap_structures(InstanceKlass* ik) {
2501 // Clean up C heap
2502 ik->release_C_heap_structures();
2503 ik->constants()->release_C_heap_structures();
2504}
2505
2506void InstanceKlass::release_C_heap_structures() {
2507 // Can't release the constant pool here because the constant pool can be
2508 // deallocated separately from the InstanceKlass for default methods and
2509 // redefine classes.
2510
2511 // Deallocate oop map cache
2512 if (_oop_map_cache != NULL) {
2513 delete _oop_map_cache;
2514 _oop_map_cache = NULL;
2515 }
2516
2517 // Deallocate JNI identifiers for jfieldIDs
2518 JNIid::deallocate(jni_ids());
2519 set_jni_ids(NULL);
2520
2521 jmethodID* jmeths = methods_jmethod_ids_acquire();
2522 if (jmeths != (jmethodID*)NULL) {
2523 release_set_methods_jmethod_ids(NULL);
2524 FreeHeap(jmeths);
2525 }
2526
2527 assert(_dep_context == NULL,
2528 "dependencies should already be cleaned");
2529
2530#if INCLUDE_JVMTI
2531 // Deallocate breakpoint records
2532 if (breakpoints() != 0x0) {
2533 methods_do(clear_all_breakpoints);
2534 assert(breakpoints() == 0x0, "should have cleared breakpoints");
2535 }
2536
2537 // deallocate the cached class file
2538 if (_cached_class_file != NULL) {
2539 os::free(_cached_class_file);
2540 _cached_class_file = NULL;
2541 }
2542#endif
2543
2544 // Decrement symbol reference counts associated with the unloaded class.
2545 if (_name != NULL) _name->decrement_refcount();
2546 // unreference array name derived from this class name (arrays of an unloaded
2547 // class can't be referenced anymore).
2548 if (_array_name != NULL) _array_name->decrement_refcount();
2549 if (_source_debug_extension != NULL) FREE_C_HEAP_ARRAY(char, _source_debug_extension);
2550}
2551
2552void InstanceKlass::set_source_debug_extension(const char* array, int length) {
2553 if (array == NULL) {
2554 _source_debug_extension = NULL;
2555 } else {
2556 // Adding one to the attribute length in order to store a null terminator
2557 // character could cause an overflow because the attribute length is
2558 // already coded with an u4 in the classfile, but in practice, it's
2559 // unlikely to happen.
2560 assert((length+1) > length, "Overflow checking");
2561 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
2562 for (int i = 0; i < length; i++) {
2563 sde[i] = array[i];
2564 }
2565 sde[length] = '\0';
2566 _source_debug_extension = sde;
2567 }
2568}
2569
2570const char* InstanceKlass::signature_name() const {
2571 int hash_len = 0;
2572 char hash_buf[40];
2573
2574 // If this is an unsafe anonymous class, append a hash to make the name unique
2575 if (is_unsafe_anonymous()) {
2576 intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0;
2577 jio_snprintf(hash_buf, sizeof(hash_buf), "/" UINTX_FORMAT, (uintx)hash);
2578 hash_len = (int)strlen(hash_buf);
2579 }
2580
2581 // Get the internal name as a c string
2582 const char* src = (const char*) (name()->as_C_string());
2583 const int src_length = (int)strlen(src);
2584
2585 char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3);
2586
2587 // Add L as type indicator
2588 int dest_index = 0;
2589 dest[dest_index++] = 'L';
2590
2591 // Add the actual class name
2592 for (int src_index = 0; src_index < src_length; ) {
2593 dest[dest_index++] = src[src_index++];
2594 }
2595
2596 // If we have a hash, append it
2597 for (int hash_index = 0; hash_index < hash_len; ) {
2598 dest[dest_index++] = hash_buf[hash_index++];
2599 }
2600
2601 // Add the semicolon and the NULL
2602 dest[dest_index++] = ';';
2603 dest[dest_index] = '\0';
2604 return dest;
2605}
2606
2607// Used to obtain the package name from a fully qualified class name.
2608Symbol* InstanceKlass::package_from_name(const Symbol* name, TRAPS) {
2609 if (name == NULL) {
2610 return NULL;
2611 } else {
2612 if (name->utf8_length() <= 0) {
2613 return NULL;
2614 }
2615 ResourceMark rm;
2616 const char* package_name = ClassLoader::package_from_name((const char*) name->as_C_string());
2617 if (package_name == NULL) {
2618 return NULL;
2619 }
2620 Symbol* pkg_name = SymbolTable::new_symbol(package_name);
2621 return pkg_name;
2622 }
2623}
2624
2625ModuleEntry* InstanceKlass::module() const {
2626 // For an unsafe anonymous class return the host class' module
2627 if (is_unsafe_anonymous()) {
2628 assert(unsafe_anonymous_host() != NULL, "unsafe anonymous class must have a host class");
2629 return unsafe_anonymous_host()->module();
2630 }
2631
2632 // Class is in a named package
2633 if (!in_unnamed_package()) {
2634 return _package_entry->module();
2635 }
2636
2637 // Class is in an unnamed package, return its loader's unnamed module
2638 return class_loader_data()->unnamed_module();
2639}
2640
2641void InstanceKlass::set_package(ClassLoaderData* loader_data, TRAPS) {
2642
2643 // ensure java/ packages only loaded by boot or platform builtin loaders
2644 check_prohibited_package(name(), loader_data, CHECK);
2645
2646 TempNewSymbol pkg_name = package_from_name(name(), CHECK);
2647
2648 if (pkg_name != NULL && loader_data != NULL) {
2649
2650 // Find in class loader's package entry table.
2651 _package_entry = loader_data->packages()->lookup_only(pkg_name);
2652
2653 // If the package name is not found in the loader's package
2654 // entry table, it is an indication that the package has not
2655 // been defined. Consider it defined within the unnamed module.
2656 if (_package_entry == NULL) {
2657 ResourceMark rm;
2658
2659 if (!ModuleEntryTable::javabase_defined()) {
2660 // Before java.base is defined during bootstrapping, define all packages in
2661 // the java.base module. If a non-java.base package is erroneously placed
2662 // in the java.base module it will be caught later when java.base
2663 // is defined by ModuleEntryTable::verify_javabase_packages check.
2664 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, JAVA_BASE_NAME " module is NULL");
2665 _package_entry = loader_data->packages()->lookup(pkg_name, ModuleEntryTable::javabase_moduleEntry());
2666 } else {
2667 assert(loader_data->unnamed_module() != NULL, "unnamed module is NULL");
2668 _package_entry = loader_data->packages()->lookup(pkg_name,
2669 loader_data->unnamed_module());
2670 }
2671
2672 // A package should have been successfully created
2673 assert(_package_entry != NULL, "Package entry for class %s not found, loader %s",
2674 name()->as_C_string(), loader_data->loader_name_and_id());
2675 }
2676
2677 if (log_is_enabled(Debug, module)) {
2678 ResourceMark rm;
2679 ModuleEntry* m = _package_entry->module();
2680 log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s",
2681 external_name(),
2682 pkg_name->as_C_string(),
2683 loader_data->loader_name_and_id(),
2684 (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE));
2685 }
2686 } else {
2687 ResourceMark rm;
2688 log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s",
2689 external_name(),
2690 (loader_data != NULL) ? loader_data->loader_name_and_id() : "NULL",
2691 UNNAMED_MODULE);
2692 }
2693}
2694
2695
2696// different versions of is_same_class_package
2697
2698bool InstanceKlass::is_same_class_package(const Klass* class2) const {
2699 oop classloader1 = this->class_loader();
2700 PackageEntry* classpkg1 = this->package();
2701 if (class2->is_objArray_klass()) {
2702 class2 = ObjArrayKlass::cast(class2)->bottom_klass();
2703 }
2704
2705 oop classloader2;
2706 PackageEntry* classpkg2;
2707 if (class2->is_instance_klass()) {
2708 classloader2 = class2->class_loader();
2709 classpkg2 = class2->package();
2710 } else {
2711 assert(class2->is_typeArray_klass(), "should be type array");
2712 classloader2 = NULL;
2713 classpkg2 = NULL;
2714 }
2715
2716 // Same package is determined by comparing class loader
2717 // and package entries. Both must be the same. This rule
2718 // applies even to classes that are defined in the unnamed
2719 // package, they still must have the same class loader.
2720 if (oopDesc::equals(classloader1, classloader2) && (classpkg1 == classpkg2)) {
2721 return true;
2722 }
2723
2724 return false;
2725}
2726
2727// return true if this class and other_class are in the same package. Classloader
2728// and classname information is enough to determine a class's package
2729bool InstanceKlass::is_same_class_package(oop other_class_loader,
2730 const Symbol* other_class_name) const {
2731 if (!oopDesc::equals(class_loader(), other_class_loader)) {
2732 return false;
2733 }
2734 if (name()->fast_compare(other_class_name) == 0) {
2735 return true;
2736 }
2737
2738 {
2739 ResourceMark rm;
2740
2741 bool bad_class_name = false;
2742 const char* other_pkg =
2743 ClassLoader::package_from_name((const char*) other_class_name->as_C_string(), &bad_class_name);
2744 if (bad_class_name) {
2745 return false;
2746 }
2747 // Check that package_from_name() returns NULL, not "", if there is no package.
2748 assert(other_pkg == NULL || strlen(other_pkg) > 0, "package name is empty string");
2749
2750 const Symbol* const this_package_name =
2751 this->package() != NULL ? this->package()->name() : NULL;
2752
2753 if (this_package_name == NULL || other_pkg == NULL) {
2754 // One of the two doesn't have a package. Only return true if the other
2755 // one also doesn't have a package.
2756 return (const char*)this_package_name == other_pkg;
2757 }
2758
2759 // Check if package is identical
2760 return this_package_name->equals(other_pkg);
2761 }
2762}
2763
2764// Returns true iff super_method can be overridden by a method in targetclassname
2765// See JLS 3rd edition 8.4.6.1
2766// Assumes name-signature match
2767// "this" is InstanceKlass of super_method which must exist
2768// note that the InstanceKlass of the method in the targetclassname has not always been created yet
2769bool InstanceKlass::is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) {
2770 // Private methods can not be overridden
2771 if (super_method->is_private()) {
2772 return false;
2773 }
2774 // If super method is accessible, then override
2775 if ((super_method->is_protected()) ||
2776 (super_method->is_public())) {
2777 return true;
2778 }
2779 // Package-private methods are not inherited outside of package
2780 assert(super_method->is_package_private(), "must be package private");
2781 return(is_same_class_package(targetclassloader(), targetclassname));
2782}
2783
2784// Only boot and platform class loaders can define classes in "java/" packages.
2785void InstanceKlass::check_prohibited_package(Symbol* class_name,
2786 ClassLoaderData* loader_data,
2787 TRAPS) {
2788 if (!loader_data->is_boot_class_loader_data() &&
2789 !loader_data->is_platform_class_loader_data() &&
2790 class_name != NULL) {
2791 ResourceMark rm(THREAD);
2792 char* name = class_name->as_C_string();
2793 if (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/') {
2794 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK);
2795 assert(pkg_name != NULL, "Error in parsing package name starting with 'java/'");
2796 name = pkg_name->as_C_string();
2797 const char* class_loader_name = loader_data->loader_name_and_id();
2798 StringUtils::replace_no_expand(name, "/", ".");
2799 const char* msg_text1 = "Class loader (instance of): ";
2800 const char* msg_text2 = " tried to load prohibited package name: ";
2801 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1;
2802 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
2803 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name);
2804 THROW_MSG(vmSymbols::java_lang_SecurityException(), message);
2805 }
2806 }
2807 return;
2808}
2809
2810bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const {
2811 constantPoolHandle i_cp(THREAD, constants());
2812 for (InnerClassesIterator iter(this); !iter.done(); iter.next()) {
2813 int ioff = iter.inner_class_info_index();
2814 if (ioff != 0) {
2815 // Check to see if the name matches the class we're looking for
2816 // before attempting to find the class.
2817 if (i_cp->klass_name_at_matches(this, ioff)) {
2818 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false);
2819 if (this == inner_klass) {
2820 *ooff = iter.outer_class_info_index();
2821 *noff = iter.inner_name_index();
2822 return true;
2823 }
2824 }
2825 }
2826 }
2827 return false;
2828}
2829
2830InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const {
2831 InstanceKlass* outer_klass = NULL;
2832 *inner_is_member = false;
2833 int ooff = 0, noff = 0;
2834 bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD);
2835 if (has_inner_classes_attr) {
2836 constantPoolHandle i_cp(THREAD, constants());
2837 if (ooff != 0) {
2838 Klass* ok = i_cp->klass_at(ooff, CHECK_NULL);
2839 outer_klass = InstanceKlass::cast(ok);
2840 *inner_is_member = true;
2841 }
2842 if (NULL == outer_klass) {
2843 // It may be unsafe anonymous; try for that.
2844 int encl_method_class_idx = enclosing_method_class_index();
2845 if (encl_method_class_idx != 0) {
2846 Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
2847 outer_klass = InstanceKlass::cast(ok);
2848 *inner_is_member = false;
2849 }
2850 }
2851 }
2852
2853 // If no inner class attribute found for this class.
2854 if (NULL == outer_klass) return NULL;
2855
2856 // Throws an exception if outer klass has not declared k as an inner klass
2857 // We need evidence that each klass knows about the other, or else
2858 // the system could allow a spoof of an inner class to gain access rights.
2859 Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL);
2860 return outer_klass;
2861}
2862
2863jint InstanceKlass::compute_modifier_flags(TRAPS) const {
2864 jint access = access_flags().as_int();
2865
2866 // But check if it happens to be member class.
2867 InnerClassesIterator iter(this);
2868 for (; !iter.done(); iter.next()) {
2869 int ioff = iter.inner_class_info_index();
2870 // Inner class attribute can be zero, skip it.
2871 // Strange but true: JVM spec. allows null inner class refs.
2872 if (ioff == 0) continue;
2873
2874 // only look at classes that are already loaded
2875 // since we are looking for the flags for our self.
2876 Symbol* inner_name = constants()->klass_name_at(ioff);
2877 if (name() == inner_name) {
2878 // This is really a member class.
2879 access = iter.inner_access_flags();
2880 break;
2881 }
2882 }
2883 // Remember to strip ACC_SUPER bit
2884 return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS;
2885}
2886
2887jint InstanceKlass::jvmti_class_status() const {
2888 jint result = 0;
2889
2890 if (is_linked()) {
2891 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
2892 }
2893
2894 if (is_initialized()) {
2895 assert(is_linked(), "Class status is not consistent");
2896 result |= JVMTI_CLASS_STATUS_INITIALIZED;
2897 }
2898 if (is_in_error_state()) {
2899 result |= JVMTI_CLASS_STATUS_ERROR;
2900 }
2901 return result;
2902}
2903
2904Method* InstanceKlass::method_at_itable(Klass* holder, int index, TRAPS) {
2905 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2906 int method_table_offset_in_words = ioe->offset()/wordSize;
2907 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
2908 / itableOffsetEntry::size();
2909
2910 for (int cnt = 0 ; ; cnt ++, ioe ++) {
2911 // If the interface isn't implemented by the receiver class,
2912 // the VM should throw IncompatibleClassChangeError.
2913 if (cnt >= nof_interfaces) {
2914 ResourceMark rm(THREAD);
2915 stringStream ss;
2916 bool same_module = (module() == holder->module());
2917 ss.print("Receiver class %s does not implement "
2918 "the interface %s defining the method to be called "
2919 "(%s%s%s)",
2920 external_name(), holder->external_name(),
2921 (same_module) ? joint_in_module_of_loader(holder) : class_in_module_of_loader(),
2922 (same_module) ? "" : "; ",
2923 (same_module) ? "" : holder->class_in_module_of_loader());
2924 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
2925 }
2926
2927 Klass* ik = ioe->interface_klass();
2928 if (ik == holder) break;
2929 }
2930
2931 itableMethodEntry* ime = ioe->first_method_entry(this);
2932 Method* m = ime[index].method();
2933 if (m == NULL) {
2934 THROW_NULL(vmSymbols::java_lang_AbstractMethodError());
2935 }
2936 return m;
2937}
2938
2939
2940#if INCLUDE_JVMTI
2941// update default_methods for redefineclasses for methods that are
2942// not yet in the vtable due to concurrent subclass define and superinterface
2943// redefinition
2944// Note: those in the vtable, should have been updated via adjust_method_entries
2945void InstanceKlass::adjust_default_methods(bool* trace_name_printed) {
2946 // search the default_methods for uses of either obsolete or EMCP methods
2947 if (default_methods() != NULL) {
2948 for (int index = 0; index < default_methods()->length(); index ++) {
2949 Method* old_method = default_methods()->at(index);
2950 if (old_method == NULL || !old_method->is_old()) {
2951 continue; // skip uninteresting entries
2952 }
2953 assert(!old_method->is_deleted(), "default methods may not be deleted");
2954 Method* new_method = old_method->get_new_method();
2955 default_methods()->at_put(index, new_method);
2956
2957 if (log_is_enabled(Info, redefine, class, update)) {
2958 ResourceMark rm;
2959 if (!(*trace_name_printed)) {
2960 log_info(redefine, class, update)
2961 ("adjust: klassname=%s default methods from name=%s",
2962 external_name(), old_method->method_holder()->external_name());
2963 *trace_name_printed = true;
2964 }
2965 log_debug(redefine, class, update, vtables)
2966 ("default method update: %s(%s) ",
2967 new_method->name()->as_C_string(), new_method->signature()->as_C_string());
2968 }
2969 }
2970 }
2971}
2972#endif // INCLUDE_JVMTI
2973
2974// On-stack replacement stuff
2975void InstanceKlass::add_osr_nmethod(nmethod* n) {
2976#ifndef PRODUCT
2977 if (TieredCompilation) {
2978 nmethod * prev = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), n->comp_level(), true);
2979 assert(prev == NULL || !prev->is_in_use(),
2980 "redundunt OSR recompilation detected. memory leak in CodeCache!");
2981 }
2982#endif
2983 // only one compilation can be active
2984 {
2985 // This is a short non-blocking critical region, so the no safepoint check is ok.
2986 MutexLocker ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
2987 assert(n->is_osr_method(), "wrong kind of nmethod");
2988 n->set_osr_link(osr_nmethods_head());
2989 set_osr_nmethods_head(n);
2990 // Raise the highest osr level if necessary
2991 if (TieredCompilation) {
2992 Method* m = n->method();
2993 m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level()));
2994 }
2995 }
2996
2997 // Get rid of the osr methods for the same bci that have lower levels.
2998 if (TieredCompilation) {
2999 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) {
3000 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true);
3001 if (inv != NULL && inv->is_in_use()) {
3002 inv->make_not_entrant();
3003 }
3004 }
3005 }
3006}
3007
3008// Remove osr nmethod from the list. Return true if found and removed.
3009bool InstanceKlass::remove_osr_nmethod(nmethod* n) {
3010 // This is a short non-blocking critical region, so the no safepoint check is ok.
3011 MutexLocker ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
3012 assert(n->is_osr_method(), "wrong kind of nmethod");
3013 nmethod* last = NULL;
3014 nmethod* cur = osr_nmethods_head();
3015 int max_level = CompLevel_none; // Find the max comp level excluding n
3016 Method* m = n->method();
3017 // Search for match
3018 bool found = false;
3019 while(cur != NULL && cur != n) {
3020 if (TieredCompilation && m == cur->method()) {
3021 // Find max level before n
3022 max_level = MAX2(max_level, cur->comp_level());
3023 }
3024 last = cur;
3025 cur = cur->osr_link();
3026 }
3027 nmethod* next = NULL;
3028 if (cur == n) {
3029 found = true;
3030 next = cur->osr_link();
3031 if (last == NULL) {
3032 // Remove first element
3033 set_osr_nmethods_head(next);
3034 } else {
3035 last->set_osr_link(next);
3036 }
3037 }
3038 n->set_osr_link(NULL);
3039 if (TieredCompilation) {
3040 cur = next;
3041 while (cur != NULL) {
3042 // Find max level after n
3043 if (m == cur->method()) {
3044 max_level = MAX2(max_level, cur->comp_level());
3045 }
3046 cur = cur->osr_link();
3047 }
3048 m->set_highest_osr_comp_level(max_level);
3049 }
3050 return found;
3051}
3052
3053int InstanceKlass::mark_osr_nmethods(const Method* m) {
3054 // This is a short non-blocking critical region, so the no safepoint check is ok.
3055 MutexLocker ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
3056 nmethod* osr = osr_nmethods_head();
3057 int found = 0;
3058 while (osr != NULL) {
3059 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3060 if (osr->method() == m) {
3061 osr->mark_for_deoptimization();
3062 found++;
3063 }
3064 osr = osr->osr_link();
3065 }
3066 return found;
3067}
3068
3069nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
3070 // This is a short non-blocking critical region, so the no safepoint check is ok.
3071 MutexLocker ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
3072 nmethod* osr = osr_nmethods_head();
3073 nmethod* best = NULL;
3074 while (osr != NULL) {
3075 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3076 // There can be a time when a c1 osr method exists but we are waiting
3077 // for a c2 version. When c2 completes its osr nmethod we will trash
3078 // the c1 version and only be able to find the c2 version. However
3079 // while we overflow in the c1 code at back branches we don't want to
3080 // try and switch to the same code as we are already running
3081
3082 if (osr->method() == m &&
3083 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
3084 if (match_level) {
3085 if (osr->comp_level() == comp_level) {
3086 // Found a match - return it.
3087 return osr;
3088 }
3089 } else {
3090 if (best == NULL || (osr->comp_level() > best->comp_level())) {
3091 if (osr->comp_level() == CompLevel_highest_tier) {
3092 // Found the best possible - return it.
3093 return osr;
3094 }
3095 best = osr;
3096 }
3097 }
3098 }
3099 osr = osr->osr_link();
3100 }
3101
3102 assert(match_level == false || best == NULL, "shouldn't pick up anything if match_level is set");
3103 if (best != NULL && best->comp_level() >= comp_level) {
3104 return best;
3105 }
3106 return NULL;
3107}
3108
3109// -----------------------------------------------------------------------------------------------------
3110// Printing
3111
3112#ifndef PRODUCT
3113
3114#define BULLET " - "
3115
3116static const char* state_names[] = {
3117 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
3118};
3119
3120static void print_vtable(intptr_t* start, int len, outputStream* st) {
3121 for (int i = 0; i < len; i++) {
3122 intptr_t e = start[i];
3123 st->print("%d : " INTPTR_FORMAT, i, e);
3124 if (MetaspaceObj::is_valid((Metadata*)e)) {
3125 st->print(" ");
3126 ((Metadata*)e)->print_value_on(st);
3127 }
3128 st->cr();
3129 }
3130}
3131
3132static void print_vtable(vtableEntry* start, int len, outputStream* st) {
3133 return print_vtable(reinterpret_cast<intptr_t*>(start), len, st);
3134}
3135
3136void InstanceKlass::print_on(outputStream* st) const {
3137 assert(is_klass(), "must be klass");
3138 Klass::print_on(st);
3139
3140 st->print(BULLET"instance size: %d", size_helper()); st->cr();
3141 st->print(BULLET"klass size: %d", size()); st->cr();
3142 st->print(BULLET"access: "); access_flags().print_on(st); st->cr();
3143 st->print(BULLET"state: "); st->print_cr("%s", state_names[_init_state]);
3144 st->print(BULLET"name: "); name()->print_value_on(st); st->cr();
3145 st->print(BULLET"super: "); Metadata::print_value_on_maybe_null(st, super()); st->cr();
3146 st->print(BULLET"sub: ");
3147 Klass* sub = subklass();
3148 int n;
3149 for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) {
3150 if (n < MaxSubklassPrintSize) {
3151 sub->print_value_on(st);
3152 st->print(" ");
3153 }
3154 }
3155 if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize);
3156 st->cr();
3157
3158 if (is_interface()) {
3159 st->print_cr(BULLET"nof implementors: %d", nof_implementors());
3160 if (nof_implementors() == 1) {
3161 st->print_cr(BULLET"implementor: ");
3162 st->print(" ");
3163 implementor()->print_value_on(st);
3164 st->cr();
3165 }
3166 }
3167
3168 st->print(BULLET"arrays: "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr();
3169 st->print(BULLET"methods: "); methods()->print_value_on(st); st->cr();
3170 if (Verbose || WizardMode) {
3171 Array<Method*>* method_array = methods();
3172 for (int i = 0; i < method_array->length(); i++) {
3173 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3174 }
3175 }
3176 st->print(BULLET"method ordering: "); method_ordering()->print_value_on(st); st->cr();
3177 st->print(BULLET"default_methods: "); default_methods()->print_value_on(st); st->cr();
3178 if (Verbose && default_methods() != NULL) {
3179 Array<Method*>* method_array = default_methods();
3180 for (int i = 0; i < method_array->length(); i++) {
3181 st->print("%d : ", i); method_array->at(i)->print_value(); st->cr();
3182 }
3183 }
3184 if (default_vtable_indices() != NULL) {
3185 st->print(BULLET"default vtable indices: "); default_vtable_indices()->print_value_on(st); st->cr();
3186 }
3187 st->print(BULLET"local interfaces: "); local_interfaces()->print_value_on(st); st->cr();
3188 st->print(BULLET"trans. interfaces: "); transitive_interfaces()->print_value_on(st); st->cr();
3189 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr();
3190 if (class_loader_data() != NULL) {
3191 st->print(BULLET"class loader data: ");
3192 class_loader_data()->print_value_on(st);
3193 st->cr();
3194 }
3195 st->print(BULLET"unsafe anonymous host class: "); Metadata::print_value_on_maybe_null(st, unsafe_anonymous_host()); st->cr();
3196 if (source_file_name() != NULL) {
3197 st->print(BULLET"source file: ");
3198 source_file_name()->print_value_on(st);
3199 st->cr();
3200 }
3201 if (source_debug_extension() != NULL) {
3202 st->print(BULLET"source debug extension: ");
3203 st->print("%s", source_debug_extension());
3204 st->cr();
3205 }
3206 st->print(BULLET"class annotations: "); class_annotations()->print_value_on(st); st->cr();
3207 st->print(BULLET"class type annotations: "); class_type_annotations()->print_value_on(st); st->cr();
3208 st->print(BULLET"field annotations: "); fields_annotations()->print_value_on(st); st->cr();
3209 st->print(BULLET"field type annotations: "); fields_type_annotations()->print_value_on(st); st->cr();
3210 {
3211 bool have_pv = false;
3212 // previous versions are linked together through the InstanceKlass
3213 for (InstanceKlass* pv_node = previous_versions();
3214 pv_node != NULL;
3215 pv_node = pv_node->previous_versions()) {
3216 if (!have_pv)
3217 st->print(BULLET"previous version: ");
3218 have_pv = true;
3219 pv_node->constants()->print_value_on(st);
3220 }
3221 if (have_pv) st->cr();
3222 }
3223
3224 if (generic_signature() != NULL) {
3225 st->print(BULLET"generic signature: ");
3226 generic_signature()->print_value_on(st);
3227 st->cr();
3228 }
3229 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr();
3230 st->print(BULLET"nest members: "); nest_members()->print_value_on(st); st->cr();
3231 if (java_mirror() != NULL) {
3232 st->print(BULLET"java mirror: ");
3233 java_mirror()->print_value_on(st);
3234 st->cr();
3235 } else {
3236 st->print_cr(BULLET"java mirror: NULL");
3237 }
3238 st->print(BULLET"vtable length %d (start addr: " INTPTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
3239 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st);
3240 st->print(BULLET"itable length %d (start addr: " INTPTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
3241 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_itable(), itable_length(), st);
3242 st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
3243 FieldPrinter print_static_field(st);
3244 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
3245 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
3246 FieldPrinter print_nonstatic_field(st);
3247 InstanceKlass* ik = const_cast<InstanceKlass*>(this);
3248 ik->do_nonstatic_fields(&print_nonstatic_field);
3249
3250 st->print(BULLET"non-static oop maps: ");
3251 OopMapBlock* map = start_of_nonstatic_oop_maps();
3252 OopMapBlock* end_map = map + nonstatic_oop_map_count();
3253 while (map < end_map) {
3254 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
3255 map++;
3256 }
3257 st->cr();
3258}
3259
3260#endif //PRODUCT
3261
3262void InstanceKlass::print_value_on(outputStream* st) const {
3263 assert(is_klass(), "must be klass");
3264 if (Verbose || WizardMode) access_flags().print_on(st);
3265 name()->print_value_on(st);
3266}
3267
3268#ifndef PRODUCT
3269
3270void FieldPrinter::do_field(fieldDescriptor* fd) {
3271 _st->print(BULLET);
3272 if (_obj == NULL) {
3273 fd->print_on(_st);
3274 _st->cr();
3275 } else {
3276 fd->print_on_for(_st, _obj);
3277 _st->cr();
3278 }
3279}
3280
3281
3282void InstanceKlass::oop_print_on(oop obj, outputStream* st) {
3283 Klass::oop_print_on(obj, st);
3284
3285 if (this == SystemDictionary::String_klass()) {
3286 typeArrayOop value = java_lang_String::value(obj);
3287 juint length = java_lang_String::length(obj);
3288 if (value != NULL &&
3289 value->is_typeArray() &&
3290 length <= (juint) value->length()) {
3291 st->print(BULLET"string: ");
3292 java_lang_String::print(obj, st);
3293 st->cr();
3294 if (!WizardMode) return; // that is enough
3295 }
3296 }
3297
3298 st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj));
3299 FieldPrinter print_field(st, obj);
3300 do_nonstatic_fields(&print_field);
3301
3302 if (this == SystemDictionary::Class_klass()) {
3303 st->print(BULLET"signature: ");
3304 java_lang_Class::print_signature(obj, st);
3305 st->cr();
3306 Klass* mirrored_klass = java_lang_Class::as_Klass(obj);
3307 st->print(BULLET"fake entry for mirror: ");
3308 Metadata::print_value_on_maybe_null(st, mirrored_klass);
3309 st->cr();
3310 Klass* array_klass = java_lang_Class::array_klass_acquire(obj);
3311 st->print(BULLET"fake entry for array: ");
3312 Metadata::print_value_on_maybe_null(st, array_klass);
3313 st->cr();
3314 st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj));
3315 st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj));
3316 Klass* real_klass = java_lang_Class::as_Klass(obj);
3317 if (real_klass != NULL && real_klass->is_instance_klass()) {
3318 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
3319 }
3320 } else if (this == SystemDictionary::MethodType_klass()) {
3321 st->print(BULLET"signature: ");
3322 java_lang_invoke_MethodType::print_signature(obj, st);
3323 st->cr();
3324 }
3325}
3326
3327bool InstanceKlass::verify_itable_index(int i) {
3328 int method_count = klassItable::method_count_for_interface(this);
3329 assert(i >= 0 && i < method_count, "index out of bounds");
3330 return true;
3331}
3332
3333#endif //PRODUCT
3334
3335void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
3336 st->print("a ");
3337 name()->print_value_on(st);
3338 obj->print_address_on(st);
3339 if (this == SystemDictionary::String_klass()
3340 && java_lang_String::value(obj) != NULL) {
3341 ResourceMark rm;
3342 int len = java_lang_String::length(obj);
3343 int plen = (len < 24 ? len : 12);
3344 char* str = java_lang_String::as_utf8_string(obj, 0, plen);
3345 st->print(" = \"%s\"", str);
3346 if (len > plen)
3347 st->print("...[%d]", len);
3348 } else if (this == SystemDictionary::Class_klass()) {
3349 Klass* k = java_lang_Class::as_Klass(obj);
3350 st->print(" = ");
3351 if (k != NULL) {
3352 k->print_value_on(st);
3353 } else {
3354 const char* tname = type2name(java_lang_Class::primitive_type(obj));
3355 st->print("%s", tname ? tname : "type?");
3356 }
3357 } else if (this == SystemDictionary::MethodType_klass()) {
3358 st->print(" = ");
3359 java_lang_invoke_MethodType::print_signature(obj, st);
3360 } else if (java_lang_boxing_object::is_instance(obj)) {
3361 st->print(" = ");
3362 java_lang_boxing_object::print(obj, st);
3363 } else if (this == SystemDictionary::LambdaForm_klass()) {
3364 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
3365 if (vmentry != NULL) {
3366 st->print(" => ");
3367 vmentry->print_value_on(st);
3368 }
3369 } else if (this == SystemDictionary::MemberName_klass()) {
3370 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
3371 if (vmtarget != NULL) {
3372 st->print(" = ");
3373 vmtarget->print_value_on(st);
3374 } else {
3375 java_lang_invoke_MemberName::clazz(obj)->print_value_on(st);
3376 st->print(".");
3377 java_lang_invoke_MemberName::name(obj)->print_value_on(st);
3378 }
3379 }
3380}
3381
3382const char* InstanceKlass::internal_name() const {
3383 return external_name();
3384}
3385
3386void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data,
3387 const char* module_name,
3388 const ClassFileStream* cfs) const {
3389 if (!log_is_enabled(Info, class, load)) {
3390 return;
3391 }
3392
3393 ResourceMark rm;
3394 LogMessage(class, load) msg;
3395 stringStream info_stream;
3396
3397 // Name and class hierarchy info
3398 info_stream.print("%s", external_name());
3399
3400 // Source
3401 if (cfs != NULL) {
3402 if (cfs->source() != NULL) {
3403 if (module_name != NULL) {
3404 // When the boot loader created the stream, it didn't know the module name
3405 // yet. Let's format it now.
3406 if (cfs->from_boot_loader_modules_image()) {
3407 info_stream.print(" source: jrt:/%s", module_name);
3408 } else {
3409 info_stream.print(" source: %s", cfs->source());
3410 }
3411 } else {
3412 info_stream.print(" source: %s", cfs->source());
3413 }
3414 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) {
3415 Thread* THREAD = Thread::current();
3416 Klass* caller =
3417 THREAD->is_Java_thread()
3418 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
3419 : NULL;
3420 // caller can be NULL, for example, during a JVMTI VM_Init hook
3421 if (caller != NULL) {
3422 info_stream.print(" source: instance of %s", caller->external_name());
3423 } else {
3424 // source is unknown
3425 }
3426 } else {
3427 oop class_loader = loader_data->class_loader();
3428 info_stream.print(" source: %s", class_loader->klass()->external_name());
3429 }
3430 } else {
3431 assert(this->is_shared(), "must be");
3432 if (MetaspaceShared::is_shared_dynamic((void*)this)) {
3433 info_stream.print(" source: shared objects file (top)");
3434 } else {
3435 info_stream.print(" source: shared objects file");
3436 }
3437 }
3438
3439 msg.info("%s", info_stream.as_string());
3440
3441 if (log_is_enabled(Debug, class, load)) {
3442 stringStream debug_stream;
3443
3444 // Class hierarchy info
3445 debug_stream.print(" klass: " INTPTR_FORMAT " super: " INTPTR_FORMAT,
3446 p2i(this), p2i(superklass()));
3447
3448 // Interfaces
3449 if (local_interfaces() != NULL && local_interfaces()->length() > 0) {
3450 debug_stream.print(" interfaces:");
3451 int length = local_interfaces()->length();
3452 for (int i = 0; i < length; i++) {
3453 debug_stream.print(" " INTPTR_FORMAT,
3454 p2i(InstanceKlass::cast(local_interfaces()->at(i))));
3455 }
3456 }
3457
3458 // Class loader
3459 debug_stream.print(" loader: [");
3460 loader_data->print_value_on(&debug_stream);
3461 debug_stream.print("]");
3462
3463 // Classfile checksum
3464 if (cfs) {
3465 debug_stream.print(" bytes: %d checksum: %08x",
3466 cfs->length(),
3467 ClassLoader::crc32(0, (const char*)cfs->buffer(),
3468 cfs->length()));
3469 }
3470
3471 msg.debug("%s", debug_stream.as_string());
3472 }
3473}
3474
3475#if INCLUDE_SERVICES
3476// Size Statistics
3477void InstanceKlass::collect_statistics(KlassSizeStats *sz) const {
3478 Klass::collect_statistics(sz);
3479
3480 sz->_inst_size = wordSize * size_helper();
3481 sz->_vtab_bytes = wordSize * vtable_length();
3482 sz->_itab_bytes = wordSize * itable_length();
3483 sz->_nonstatic_oopmap_bytes = wordSize * nonstatic_oop_map_size();
3484
3485 int n = 0;
3486 n += (sz->_methods_array_bytes = sz->count_array(methods()));
3487 n += (sz->_method_ordering_bytes = sz->count_array(method_ordering()));
3488 n += (sz->_local_interfaces_bytes = sz->count_array(local_interfaces()));
3489 n += (sz->_transitive_interfaces_bytes = sz->count_array(transitive_interfaces()));
3490 n += (sz->_fields_bytes = sz->count_array(fields()));
3491 n += (sz->_inner_classes_bytes = sz->count_array(inner_classes()));
3492 n += (sz->_nest_members_bytes = sz->count_array(nest_members()));
3493 sz->_ro_bytes += n;
3494
3495 const ConstantPool* cp = constants();
3496 if (cp) {
3497 cp->collect_statistics(sz);
3498 }
3499
3500 const Annotations* anno = annotations();
3501 if (anno) {
3502 anno->collect_statistics(sz);
3503 }
3504
3505 const Array<Method*>* methods_array = methods();
3506 if (methods()) {
3507 for (int i = 0; i < methods_array->length(); i++) {
3508 Method* method = methods_array->at(i);
3509 if (method) {
3510 sz->_method_count ++;
3511 method->collect_statistics(sz);
3512 }
3513 }
3514 }
3515}
3516#endif // INCLUDE_SERVICES
3517
3518// Verification
3519
3520class VerifyFieldClosure: public BasicOopIterateClosure {
3521 protected:
3522 template <class T> void do_oop_work(T* p) {
3523 oop obj = RawAccess<>::oop_load(p);
3524 if (!oopDesc::is_oop_or_null(obj)) {
3525 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj));
3526 Universe::print_on(tty);
3527 guarantee(false, "boom");
3528 }
3529 }
3530 public:
3531 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); }
3532 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
3533};
3534
3535void InstanceKlass::verify_on(outputStream* st) {
3536#ifndef PRODUCT
3537 // Avoid redundant verifies, this really should be in product.
3538 if (_verify_count == Universe::verify_count()) return;
3539 _verify_count = Universe::verify_count();
3540#endif
3541
3542 // Verify Klass
3543 Klass::verify_on(st);
3544
3545 // Verify that klass is present in ClassLoaderData
3546 guarantee(class_loader_data()->contains_klass(this),
3547 "this class isn't found in class loader data");
3548
3549 // Verify vtables
3550 if (is_linked()) {
3551 // $$$ This used to be done only for m/s collections. Doing it
3552 // always seemed a valid generalization. (DLD -- 6/00)
3553 vtable().verify(st);
3554 }
3555
3556 // Verify first subklass
3557 if (subklass() != NULL) {
3558 guarantee(subklass()->is_klass(), "should be klass");
3559 }
3560
3561 // Verify siblings
3562 Klass* super = this->super();
3563 Klass* sib = next_sibling();
3564 if (sib != NULL) {
3565 if (sib == this) {
3566 fatal("subclass points to itself " PTR_FORMAT, p2i(sib));
3567 }
3568
3569 guarantee(sib->is_klass(), "should be klass");
3570 guarantee(sib->super() == super, "siblings should have same superklass");
3571 }
3572
3573 // Verify local interfaces
3574 if (local_interfaces()) {
3575 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
3576 for (int j = 0; j < local_interfaces->length(); j++) {
3577 InstanceKlass* e = local_interfaces->at(j);
3578 guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
3579 }
3580 }
3581
3582 // Verify transitive interfaces
3583 if (transitive_interfaces() != NULL) {
3584 Array<InstanceKlass*>* transitive_interfaces = this->transitive_interfaces();
3585 for (int j = 0; j < transitive_interfaces->length(); j++) {
3586 InstanceKlass* e = transitive_interfaces->at(j);
3587 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
3588 }
3589 }
3590
3591 // Verify methods
3592 if (methods() != NULL) {
3593 Array<Method*>* methods = this->methods();
3594 for (int j = 0; j < methods->length(); j++) {
3595 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3596 }
3597 for (int j = 0; j < methods->length() - 1; j++) {
3598 Method* m1 = methods->at(j);
3599 Method* m2 = methods->at(j + 1);
3600 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3601 }
3602 }
3603
3604 // Verify method ordering
3605 if (method_ordering() != NULL) {
3606 Array<int>* method_ordering = this->method_ordering();
3607 int length = method_ordering->length();
3608 if (JvmtiExport::can_maintain_original_method_order() ||
3609 ((UseSharedSpaces || DumpSharedSpaces) && length != 0)) {
3610 guarantee(length == methods()->length(), "invalid method ordering length");
3611 jlong sum = 0;
3612 for (int j = 0; j < length; j++) {
3613 int original_index = method_ordering->at(j);
3614 guarantee(original_index >= 0, "invalid method ordering index");
3615 guarantee(original_index < length, "invalid method ordering index");
3616 sum += original_index;
3617 }
3618 // Verify sum of indices 0,1,...,length-1
3619 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
3620 } else {
3621 guarantee(length == 0, "invalid method ordering length");
3622 }
3623 }
3624
3625 // Verify default methods
3626 if (default_methods() != NULL) {
3627 Array<Method*>* methods = this->default_methods();
3628 for (int j = 0; j < methods->length(); j++) {
3629 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3630 }
3631 for (int j = 0; j < methods->length() - 1; j++) {
3632 Method* m1 = methods->at(j);
3633 Method* m2 = methods->at(j + 1);
3634 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3635 }
3636 }
3637
3638 // Verify JNI static field identifiers
3639 if (jni_ids() != NULL) {
3640 jni_ids()->verify(this);
3641 }
3642
3643 // Verify other fields
3644 if (array_klasses() != NULL) {
3645 guarantee(array_klasses()->is_klass(), "should be klass");
3646 }
3647 if (constants() != NULL) {
3648 guarantee(constants()->is_constantPool(), "should be constant pool");
3649 }
3650 const Klass* anonymous_host = unsafe_anonymous_host();
3651 if (anonymous_host != NULL) {
3652 guarantee(anonymous_host->is_klass(), "should be klass");
3653 }
3654}
3655
3656void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
3657 Klass::oop_verify_on(obj, st);
3658 VerifyFieldClosure blk;
3659 obj->oop_iterate(&blk);
3660}
3661
3662
3663// JNIid class for jfieldIDs only
3664// Note to reviewers:
3665// These JNI functions are just moved over to column 1 and not changed
3666// in the compressed oops workspace.
3667JNIid::JNIid(Klass* holder, int offset, JNIid* next) {
3668 _holder = holder;
3669 _offset = offset;
3670 _next = next;
3671 debug_only(_is_static_field_id = false;)
3672}
3673
3674
3675JNIid* JNIid::find(int offset) {
3676 JNIid* current = this;
3677 while (current != NULL) {
3678 if (current->offset() == offset) return current;
3679 current = current->next();
3680 }
3681 return NULL;
3682}
3683
3684void JNIid::deallocate(JNIid* current) {
3685 while (current != NULL) {
3686 JNIid* next = current->next();
3687 delete current;
3688 current = next;
3689 }
3690}
3691
3692
3693void JNIid::verify(Klass* holder) {
3694 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields();
3695 int end_field_offset;
3696 end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize);
3697
3698 JNIid* current = this;
3699 while (current != NULL) {
3700 guarantee(current->holder() == holder, "Invalid klass in JNIid");
3701#ifdef ASSERT
3702 int o = current->offset();
3703 if (current->is_static_field_id()) {
3704 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid");
3705 }
3706#endif
3707 current = current->next();
3708 }
3709}
3710
3711void InstanceKlass::set_init_state(ClassState state) {
3712#ifdef ASSERT
3713 bool good_state = is_shared() ? (_init_state <= state)
3714 : (_init_state < state);
3715 assert(good_state || state == allocated, "illegal state transition");
3716#endif
3717 assert(_init_thread == NULL, "should be cleared before state change");
3718 _init_state = (u1)state;
3719}
3720
3721#if INCLUDE_JVMTI
3722
3723// RedefineClasses() support for previous versions
3724
3725// Globally, there is at least one previous version of a class to walk
3726// during class unloading, which is saved because old methods in the class
3727// are still running. Otherwise the previous version list is cleaned up.
3728bool InstanceKlass::_has_previous_versions = false;
3729
3730// Returns true if there are previous versions of a class for class
3731// unloading only. Also resets the flag to false. purge_previous_version
3732// will set the flag to true if there are any left, i.e., if there's any
3733// work to do for next time. This is to avoid the expensive code cache
3734// walk in CLDG::clean_deallocate_lists().
3735bool InstanceKlass::has_previous_versions_and_reset() {
3736 bool ret = _has_previous_versions;
3737 log_trace(redefine, class, iklass, purge)("Class unloading: has_previous_versions = %s",
3738 ret ? "true" : "false");
3739 _has_previous_versions = false;
3740 return ret;
3741}
3742
3743// Purge previous versions before adding new previous versions of the class and
3744// during class unloading.
3745void InstanceKlass::purge_previous_version_list() {
3746 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
3747 assert(has_been_redefined(), "Should only be called for main class");
3748
3749 // Quick exit.
3750 if (previous_versions() == NULL) {
3751 return;
3752 }
3753
3754 // This klass has previous versions so see what we can cleanup
3755 // while it is safe to do so.
3756
3757 int deleted_count = 0; // leave debugging breadcrumbs
3758 int live_count = 0;
3759 ClassLoaderData* loader_data = class_loader_data();
3760 assert(loader_data != NULL, "should never be null");
3761
3762 ResourceMark rm;
3763 log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name());
3764
3765 // previous versions are linked together through the InstanceKlass
3766 InstanceKlass* pv_node = previous_versions();
3767 InstanceKlass* last = this;
3768 int version = 0;
3769
3770 // check the previous versions list
3771 for (; pv_node != NULL; ) {
3772
3773 ConstantPool* pvcp = pv_node->constants();
3774 assert(pvcp != NULL, "cp ref was unexpectedly cleared");
3775
3776 if (!pvcp->on_stack()) {
3777 // If the constant pool isn't on stack, none of the methods
3778 // are executing. Unlink this previous_version.
3779 // The previous version InstanceKlass is on the ClassLoaderData deallocate list
3780 // so will be deallocated during the next phase of class unloading.
3781 log_trace(redefine, class, iklass, purge)
3782 ("previous version " INTPTR_FORMAT " is dead.", p2i(pv_node));
3783 // For debugging purposes.
3784 pv_node->set_is_scratch_class();
3785 // Unlink from previous version list.
3786 assert(pv_node->class_loader_data() == loader_data, "wrong loader_data");
3787 InstanceKlass* next = pv_node->previous_versions();
3788 pv_node->link_previous_versions(NULL); // point next to NULL
3789 last->link_previous_versions(next);
3790 // Add to the deallocate list after unlinking
3791 loader_data->add_to_deallocate_list(pv_node);
3792 pv_node = next;
3793 deleted_count++;
3794 version++;
3795 continue;
3796 } else {
3797 log_trace(redefine, class, iklass, purge)("previous version " INTPTR_FORMAT " is alive", p2i(pv_node));
3798 assert(pvcp->pool_holder() != NULL, "Constant pool with no holder");
3799 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
3800 live_count++;
3801 // found a previous version for next time we do class unloading
3802 _has_previous_versions = true;
3803 }
3804
3805 // At least one method is live in this previous version.
3806 // Reset dead EMCP methods not to get breakpoints.
3807 // All methods are deallocated when all of the methods for this class are no
3808 // longer running.
3809 Array<Method*>* method_refs = pv_node->methods();
3810 if (method_refs != NULL) {
3811 log_trace(redefine, class, iklass, purge)("previous methods length=%d", method_refs->length());
3812 for (int j = 0; j < method_refs->length(); j++) {
3813 Method* method = method_refs->at(j);
3814
3815 if (!method->on_stack()) {
3816 // no breakpoints for non-running methods
3817 if (method->is_running_emcp()) {
3818 method->set_running_emcp(false);
3819 }
3820 } else {
3821 assert (method->is_obsolete() || method->is_running_emcp(),
3822 "emcp method cannot run after emcp bit is cleared");
3823 log_trace(redefine, class, iklass, purge)
3824 ("purge: %s(%s): prev method @%d in version @%d is alive",
3825 method->name()->as_C_string(), method->signature()->as_C_string(), j, version);
3826 }
3827 }
3828 }
3829 // next previous version
3830 last = pv_node;
3831 pv_node = pv_node->previous_versions();
3832 version++;
3833 }
3834 log_trace(redefine, class, iklass, purge)
3835 ("previous version stats: live=%d, deleted=%d", live_count, deleted_count);
3836}
3837
3838void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods,
3839 int emcp_method_count) {
3840 int obsolete_method_count = old_methods->length() - emcp_method_count;
3841
3842 if (emcp_method_count != 0 && obsolete_method_count != 0 &&
3843 _previous_versions != NULL) {
3844 // We have a mix of obsolete and EMCP methods so we have to
3845 // clear out any matching EMCP method entries the hard way.
3846 int local_count = 0;
3847 for (int i = 0; i < old_methods->length(); i++) {
3848 Method* old_method = old_methods->at(i);
3849 if (old_method->is_obsolete()) {
3850 // only obsolete methods are interesting
3851 Symbol* m_name = old_method->name();
3852 Symbol* m_signature = old_method->signature();
3853
3854 // previous versions are linked together through the InstanceKlass
3855 int j = 0;
3856 for (InstanceKlass* prev_version = _previous_versions;
3857 prev_version != NULL;
3858 prev_version = prev_version->previous_versions(), j++) {
3859
3860 Array<Method*>* method_refs = prev_version->methods();
3861 for (int k = 0; k < method_refs->length(); k++) {
3862 Method* method = method_refs->at(k);
3863
3864 if (!method->is_obsolete() &&
3865 method->name() == m_name &&
3866 method->signature() == m_signature) {
3867 // The current RedefineClasses() call has made all EMCP
3868 // versions of this method obsolete so mark it as obsolete
3869 log_trace(redefine, class, iklass, add)
3870 ("%s(%s): flush obsolete method @%d in version @%d",
3871 m_name->as_C_string(), m_signature->as_C_string(), k, j);
3872
3873 method->set_is_obsolete();
3874 break;
3875 }
3876 }
3877
3878 // The previous loop may not find a matching EMCP method, but
3879 // that doesn't mean that we can optimize and not go any
3880 // further back in the PreviousVersion generations. The EMCP
3881 // method for this generation could have already been made obsolete,
3882 // but there still may be an older EMCP method that has not
3883 // been made obsolete.
3884 }
3885
3886 if (++local_count >= obsolete_method_count) {
3887 // no more obsolete methods so bail out now
3888 break;
3889 }
3890 }
3891 }
3892 }
3893}
3894
3895// Save the scratch_class as the previous version if any of the methods are running.
3896// The previous_versions are used to set breakpoints in EMCP methods and they are
3897// also used to clean MethodData links to redefined methods that are no longer running.
3898void InstanceKlass::add_previous_version(InstanceKlass* scratch_class,
3899 int emcp_method_count) {
3900 assert(Thread::current()->is_VM_thread(),
3901 "only VMThread can add previous versions");
3902
3903 ResourceMark rm;
3904 log_trace(redefine, class, iklass, add)
3905 ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count);
3906
3907 // Clean out old previous versions for this class
3908 purge_previous_version_list();
3909
3910 // Mark newly obsolete methods in remaining previous versions. An EMCP method from
3911 // a previous redefinition may be made obsolete by this redefinition.
3912 Array<Method*>* old_methods = scratch_class->methods();
3913 mark_newly_obsolete_methods(old_methods, emcp_method_count);
3914
3915 // If the constant pool for this previous version of the class
3916 // is not marked as being on the stack, then none of the methods
3917 // in this previous version of the class are on the stack so
3918 // we don't need to add this as a previous version.
3919 ConstantPool* cp_ref = scratch_class->constants();
3920 if (!cp_ref->on_stack()) {
3921 log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running");
3922 // For debugging purposes.
3923 scratch_class->set_is_scratch_class();
3924 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class);
3925 return;
3926 }
3927
3928 if (emcp_method_count != 0) {
3929 // At least one method is still running, check for EMCP methods
3930 for (int i = 0; i < old_methods->length(); i++) {
3931 Method* old_method = old_methods->at(i);
3932 if (!old_method->is_obsolete() && old_method->on_stack()) {
3933 // if EMCP method (not obsolete) is on the stack, mark as EMCP so that
3934 // we can add breakpoints for it.
3935
3936 // We set the method->on_stack bit during safepoints for class redefinition
3937 // and use this bit to set the is_running_emcp bit.
3938 // After the safepoint, the on_stack bit is cleared and the running emcp
3939 // method may exit. If so, we would set a breakpoint in a method that
3940 // is never reached, but this won't be noticeable to the programmer.
3941 old_method->set_running_emcp(true);
3942 log_trace(redefine, class, iklass, add)
3943 ("EMCP method %s is on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
3944 } else if (!old_method->is_obsolete()) {
3945 log_trace(redefine, class, iklass, add)
3946 ("EMCP method %s is NOT on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
3947 }
3948 }
3949 }
3950
3951 // Add previous version if any methods are still running.
3952 // Set has_previous_version flag for processing during class unloading.
3953 _has_previous_versions = true;
3954 log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack.");
3955 assert(scratch_class->previous_versions() == NULL, "shouldn't have a previous version");
3956 scratch_class->link_previous_versions(previous_versions());
3957 link_previous_versions(scratch_class);
3958} // end add_previous_version()
3959
3960#endif // INCLUDE_JVMTI
3961
3962Method* InstanceKlass::method_with_idnum(int idnum) {
3963 Method* m = NULL;
3964 if (idnum < methods()->length()) {
3965 m = methods()->at(idnum);
3966 }
3967 if (m == NULL || m->method_idnum() != idnum) {
3968 for (int index = 0; index < methods()->length(); ++index) {
3969 m = methods()->at(index);
3970 if (m->method_idnum() == idnum) {
3971 return m;
3972 }
3973 }
3974 // None found, return null for the caller to handle.
3975 return NULL;
3976 }
3977 return m;
3978}
3979
3980
3981Method* InstanceKlass::method_with_orig_idnum(int idnum) {
3982 if (idnum >= methods()->length()) {
3983 return NULL;
3984 }
3985 Method* m = methods()->at(idnum);
3986 if (m != NULL && m->orig_method_idnum() == idnum) {
3987 return m;
3988 }
3989 // Obsolete method idnum does not match the original idnum
3990 for (int index = 0; index < methods()->length(); ++index) {
3991 m = methods()->at(index);
3992 if (m->orig_method_idnum() == idnum) {
3993 return m;
3994 }
3995 }
3996 // None found, return null for the caller to handle.
3997 return NULL;
3998}
3999
4000
4001Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) {
4002 InstanceKlass* holder = get_klass_version(version);
4003 if (holder == NULL) {
4004 return NULL; // The version of klass is gone, no method is found
4005 }
4006 Method* method = holder->method_with_orig_idnum(idnum);
4007 return method;
4008}
4009
4010#if INCLUDE_JVMTI
4011JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() {
4012 return _cached_class_file;
4013}
4014
4015jint InstanceKlass::get_cached_class_file_len() {
4016 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
4017}
4018
4019unsigned char * InstanceKlass::get_cached_class_file_bytes() {
4020 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
4021}
4022#endif
4023