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 "oops/valueKlass.hpp"
68 #include "prims/jvmtiExport.hpp"
69 #include "prims/jvmtiRedefineClasses.hpp"
70 #include "prims/jvmtiThreadState.hpp"
71 #include "prims/methodComparator.hpp"
72 #include "runtime/atomic.hpp"
73 #include "runtime/fieldDescriptor.inline.hpp"
74 #include "runtime/handles.inline.hpp"
75 #include "runtime/javaCalls.hpp"
76 #include "runtime/mutexLocker.hpp"
77 #include "runtime/orderAccess.hpp"
78 #include "runtime/thread.inline.hpp"
79 #include "services/classLoadingService.hpp"
80 #include "services/threadService.hpp"
81 #include "utilities/dtrace.hpp"
82 #include "utilities/events.hpp"
83 #include "utilities/macros.hpp"
84 #include "utilities/stringUtils.hpp"
85 #ifdef COMPILER1
86 #include "c1/c1_Compiler.hpp"
87 #endif
88 #if INCLUDE_JFR
89 #include "jfr/jfrEvents.hpp"
90 #endif
91
92
93 #ifdef DTRACE_ENABLED
94
95
96 #define HOTSPOT_CLASS_INITIALIZATION_required HOTSPOT_CLASS_INITIALIZATION_REQUIRED
97 #define HOTSPOT_CLASS_INITIALIZATION_recursive HOTSPOT_CLASS_INITIALIZATION_RECURSIVE
98 #define HOTSPOT_CLASS_INITIALIZATION_concurrent HOTSPOT_CLASS_INITIALIZATION_CONCURRENT
99 #define HOTSPOT_CLASS_INITIALIZATION_erroneous HOTSPOT_CLASS_INITIALIZATION_ERRONEOUS
100 #define HOTSPOT_CLASS_INITIALIZATION_super__failed HOTSPOT_CLASS_INITIALIZATION_SUPER_FAILED
101 #define HOTSPOT_CLASS_INITIALIZATION_clinit HOTSPOT_CLASS_INITIALIZATION_CLINIT
102 #define HOTSPOT_CLASS_INITIALIZATION_error HOTSPOT_CLASS_INITIALIZATION_ERROR
103 #define HOTSPOT_CLASS_INITIALIZATION_end HOTSPOT_CLASS_INITIALIZATION_END
104 #define DTRACE_CLASSINIT_PROBE(type, thread_type) \
105 { \
106 char* data = NULL; \
107 int len = 0; \
108 Symbol* clss_name = name(); \
109 if (clss_name != NULL) { \
110 data = (char*)clss_name->bytes(); \
111 len = clss_name->utf8_length(); \
112 } \
113 HOTSPOT_CLASS_INITIALIZATION_##type( \
114 data, len, (void*)class_loader(), thread_type); \
115 }
116
117 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait) \
118 { \
119 char* data = NULL; \
120 int len = 0; \
121 Symbol* clss_name = name(); \
122 if (clss_name != NULL) { \
123 data = (char*)clss_name->bytes(); \
124 len = clss_name->utf8_length(); \
125 } \
126 HOTSPOT_CLASS_INITIALIZATION_##type( \
127 data, len, (void*)class_loader(), thread_type, wait); \
128 }
129
130 #else // ndef DTRACE_ENABLED
131
132 #define DTRACE_CLASSINIT_PROBE(type, thread_type)
133 #define DTRACE_CLASSINIT_PROBE_WAIT(type, thread_type, wait)
134
135 #endif // ndef DTRACE_ENABLED
136
137 static inline bool is_class_loader(const Symbol* class_name,
138 const ClassFileParser& parser) {
139 assert(class_name != NULL, "invariant");
140
141 if (class_name == vmSymbols::java_lang_ClassLoader()) {
142 return true;
143 }
144
145 if (SystemDictionary::ClassLoader_klass_loaded()) {
146 const Klass* const super_klass = parser.super_klass();
147 if (super_klass != NULL) {
148 if (super_klass->is_subtype_of(SystemDictionary::ClassLoader_klass())) {
149 return true;
150 }
151 }
152 }
153 return false;
154 }
155
156 // called to verify that k is a member of this nest
157 bool InstanceKlass::has_nest_member(InstanceKlass* k, TRAPS) const {
158 if (_nest_members == NULL || _nest_members == Universe::the_empty_short_array()) {
159 if (log_is_enabled(Trace, class, nestmates)) {
160 ResourceMark rm(THREAD);
161 log_trace(class, nestmates)("Checked nest membership of %s in non-nest-host class %s",
162 k->external_name(), this->external_name());
163 }
164 return false;
165 }
166
167 if (log_is_enabled(Trace, class, nestmates)) {
168 ResourceMark rm(THREAD);
169 log_trace(class, nestmates)("Checking nest membership of %s in %s",
170 k->external_name(), this->external_name());
171 }
172
173 // Check for a resolved cp entry , else fall back to a name check.
174 // We don't want to resolve any class other than the one being checked.
175 for (int i = 0; i < _nest_members->length(); i++) {
176 int cp_index = _nest_members->at(i);
177 if (_constants->tag_at(cp_index).is_klass()) {
178 Klass* k2 = _constants->klass_at(cp_index, CHECK_false);
179 if (k2 == k) {
180 log_trace(class, nestmates)("- class is listed at nest_members[%d] => cp[%d]", i, cp_index);
181 return true;
182 }
183 }
184 else {
185 Symbol* name = _constants->klass_name_at(cp_index);
186 if (name == k->name()) {
187 log_trace(class, nestmates)("- Found it at nest_members[%d] => cp[%d]", i, cp_index);
188
189 // Names match so check actual klass - this may trigger class loading if
190 // it doesn't match (though that should be impossible). But to be safe we
191 // have to check for a compiler thread executing here.
192 if (!THREAD->can_call_java() && !_constants->tag_at(cp_index).is_klass()) {
193 log_trace(class, nestmates)("- validation required resolution in an unsuitable thread");
194 return false;
195 }
196
197 Klass* k2 = _constants->klass_at(cp_index, CHECK_false);
198 if (k2 == k) {
199 log_trace(class, nestmates)("- class is listed as a nest member");
200 return true;
201 }
202 else {
203 // same name but different klass!
204 log_trace(class, nestmates)(" - klass comparison failed!");
205 // can't have two names the same, so we're done
206 return false;
207 }
208 }
209 }
210 }
211 log_trace(class, nestmates)("- class is NOT a nest member!");
212 return false;
213 }
214
215 // Return nest-host class, resolving, validating and saving it if needed.
216 // In cases where this is called from a thread that can not do classloading
217 // (such as a native JIT thread) then we simply return NULL, which in turn
218 // causes the access check to return false. Such code will retry the access
219 // from a more suitable environment later.
220 InstanceKlass* InstanceKlass::nest_host(Symbol* validationException, TRAPS) {
221 InstanceKlass* nest_host_k = _nest_host;
222 if (nest_host_k == NULL) {
223 // need to resolve and save our nest-host class. This could be attempted
224 // concurrently but as the result is idempotent and we don't use the class
225 // then we do not need any synchronization beyond what is implicitly used
226 // during class loading.
227 if (_nest_host_index != 0) { // we have a real nest_host
228 // Before trying to resolve check if we're in a suitable context
229 if (!THREAD->can_call_java() && !_constants->tag_at(_nest_host_index).is_klass()) {
230 if (log_is_enabled(Trace, class, nestmates)) {
231 ResourceMark rm(THREAD);
232 log_trace(class, nestmates)("Rejected resolution of nest-host of %s in unsuitable thread",
233 this->external_name());
234 }
235 return NULL;
236 }
237
238 if (log_is_enabled(Trace, class, nestmates)) {
239 ResourceMark rm(THREAD);
240 log_trace(class, nestmates)("Resolving nest-host of %s using cp entry for %s",
241 this->external_name(),
242 _constants->klass_name_at(_nest_host_index)->as_C_string());
243 }
244
245 Klass* k = _constants->klass_at(_nest_host_index, THREAD);
246 if (HAS_PENDING_EXCEPTION) {
247 Handle exc_h = Handle(THREAD, PENDING_EXCEPTION);
248 if (exc_h->is_a(SystemDictionary::NoClassDefFoundError_klass())) {
249 // throw a new CDNFE with the original as its cause, and a clear msg
250 ResourceMark rm(THREAD);
251 char buf[200];
252 CLEAR_PENDING_EXCEPTION;
253 jio_snprintf(buf, sizeof(buf),
254 "Unable to load nest-host class (%s) of %s",
255 _constants->klass_name_at(_nest_host_index)->as_C_string(),
256 this->external_name());
257 log_trace(class, nestmates)("%s - NoClassDefFoundError", buf);
258 THROW_MSG_CAUSE_NULL(vmSymbols::java_lang_NoClassDefFoundError(), buf, exc_h);
259 }
260 // All other exceptions pass through (OOME, StackOverflowError, LinkageErrors etc).
261 return NULL;
262 }
263
264 // A valid nest-host is an instance class in the current package that lists this
265 // class as a nest member. If any of these conditions are not met we post the
266 // requested exception type (if any) and return NULL
267
268 const char* error = NULL;
269
270 // JVMS 5.4.4 indicates package check comes first
271 if (is_same_class_package(k)) {
272
273 // Now check actual membership. We can't be a member if our "host" is
274 // not an instance class.
275 if (k->is_instance_klass()) {
276 nest_host_k = InstanceKlass::cast(k);
277
278 bool is_member = nest_host_k->has_nest_member(this, CHECK_NULL);
279 if (is_member) {
280 // save resolved nest-host value
281 _nest_host = nest_host_k;
282
283 if (log_is_enabled(Trace, class, nestmates)) {
284 ResourceMark rm(THREAD);
285 log_trace(class, nestmates)("Resolved nest-host of %s to %s",
286 this->external_name(), k->external_name());
287 }
288 return nest_host_k;
289 }
290 }
291 error = "current type is not listed as a nest member";
292 } else {
293 error = "types are in different packages";
294 }
295
296 if (log_is_enabled(Trace, class, nestmates)) {
297 ResourceMark rm(THREAD);
298 log_trace(class, nestmates)
299 ("Type %s (loader: %s) is not a nest member of "
300 "resolved type %s (loader: %s): %s",
301 this->external_name(),
302 this->class_loader_data()->loader_name_and_id(),
303 k->external_name(),
304 k->class_loader_data()->loader_name_and_id(),
305 error);
306 }
307
308 if (validationException != NULL && THREAD->can_call_java()) {
309 ResourceMark rm(THREAD);
310 Exceptions::fthrow(THREAD_AND_LOCATION,
311 validationException,
312 "Type %s (loader: %s) is not a nest member of %s (loader: %s): %s",
313 this->external_name(),
314 this->class_loader_data()->loader_name_and_id(),
315 k->external_name(),
316 k->class_loader_data()->loader_name_and_id(),
317 error
318 );
319 }
320 return NULL;
321 } else {
322 if (log_is_enabled(Trace, class, nestmates)) {
323 ResourceMark rm(THREAD);
324 log_trace(class, nestmates)("Type %s is not part of a nest: setting nest-host to self",
325 this->external_name());
326 }
327 // save resolved nest-host value
328 return (_nest_host = this);
329 }
330 }
331 return nest_host_k;
332 }
333
334 // check if 'this' and k are nestmates (same nest_host), or k is our nest_host,
335 // or we are k's nest_host - all of which is covered by comparing the two
336 // resolved_nest_hosts
337 bool InstanceKlass::has_nestmate_access_to(InstanceKlass* k, TRAPS) {
338
339 assert(this != k, "this should be handled by higher-level code");
340
341 // Per JVMS 5.4.4 we first resolve and validate the current class, then
342 // the target class k. Resolution exceptions will be passed on by upper
343 // layers. IncompatibleClassChangeErrors from membership validation failures
344 // will also be passed through.
345
346 Symbol* icce = vmSymbols::java_lang_IncompatibleClassChangeError();
347 InstanceKlass* cur_host = nest_host(icce, CHECK_false);
348 if (cur_host == NULL) {
349 return false;
350 }
351
352 Klass* k_nest_host = k->nest_host(icce, CHECK_false);
353 if (k_nest_host == NULL) {
354 return false;
355 }
356
357 bool access = (cur_host == k_nest_host);
358
359 if (log_is_enabled(Trace, class, nestmates)) {
360 ResourceMark rm(THREAD);
361 log_trace(class, nestmates)("Class %s does %shave nestmate access to %s",
362 this->external_name(),
363 access ? "" : "NOT ",
364 k->external_name());
365 }
366
367 return access;
368 }
369
370 InstanceKlass* InstanceKlass::allocate_instance_klass(const ClassFileParser& parser, TRAPS) {
371 const int size = InstanceKlass::size(parser.vtable_size(),
372 parser.itable_size(),
373 nonstatic_oop_map_size(parser.total_oop_map_count()),
374 parser.is_interface(),
375 parser.is_unsafe_anonymous(),
376 should_store_fingerprint(parser.is_unsafe_anonymous()),
377 parser.has_flattenable_fields() ? parser.java_fields_count() : 0,
378 parser.is_value_type());
379
380 const Symbol* const class_name = parser.class_name();
381 assert(class_name != NULL, "invariant");
382 ClassLoaderData* loader_data = parser.loader_data();
383 assert(loader_data != NULL, "invariant");
384
385 InstanceKlass* ik;
386
387 // Allocation
388 if (REF_NONE == parser.reference_type()) {
389 if (class_name == vmSymbols::java_lang_Class()) {
390 // mirror
391 ik = new (loader_data, size, THREAD) InstanceMirrorKlass(parser);
392 } else if (is_class_loader(class_name, parser)) {
393 // class loader
394 ik = new (loader_data, size, THREAD) InstanceClassLoaderKlass(parser);
395 } else if (parser.is_value_type()) {
396 // value type
397 ik = new (loader_data, size, THREAD) ValueKlass(parser);
398 } else {
399 // normal
400 ik = new (loader_data, size, THREAD) InstanceKlass(parser, InstanceKlass::_misc_kind_other);
401 }
402 } else {
403 // reference
404 ik = new (loader_data, size, THREAD) InstanceRefKlass(parser);
405 }
406
407 // Check for pending exception before adding to the loader data and incrementing
408 // class count. Can get OOM here.
409 if (HAS_PENDING_EXCEPTION) {
410 return NULL;
411 }
412
413 #ifdef ASSERT
414 assert(ik->size() == size, "");
415 ik->bounds_check((address) ik->start_of_vtable(), false, size);
416 ik->bounds_check((address) ik->start_of_itable(), false, size);
417 ik->bounds_check((address) ik->end_of_itable(), true, size);
418 ik->bounds_check((address) ik->end_of_nonstatic_oop_maps(), true, size);
419 #endif //ASSERT
420 return ik;
421 }
422
423 #ifndef PRODUCT
424 bool InstanceKlass::bounds_check(address addr, bool edge_ok, intptr_t size_in_bytes) const {
425 const char* bad = NULL;
426 address end = NULL;
427 if (addr < (address)this) {
428 bad = "before";
429 } else if (addr == (address)this) {
430 if (edge_ok) return true;
431 bad = "just before";
432 } else if (addr == (end = (address)this + sizeof(intptr_t) * (size_in_bytes < 0 ? size() : size_in_bytes))) {
433 if (edge_ok) return true;
434 bad = "just after";
435 } else if (addr > end) {
436 bad = "after";
437 } else {
438 return true;
439 }
440 tty->print_cr("%s object bounds: " INTPTR_FORMAT " [" INTPTR_FORMAT ".." INTPTR_FORMAT "]",
441 bad, (intptr_t)addr, (intptr_t)this, (intptr_t)end);
442 Verbose = WizardMode = true; this->print(); //@@
443 return false;
444 }
445 #endif //PRODUCT
446
447 // copy method ordering from resource area to Metaspace
448 void InstanceKlass::copy_method_ordering(const intArray* m, TRAPS) {
449 if (m != NULL) {
450 // allocate a new array and copy contents (memcpy?)
451 _method_ordering = MetadataFactory::new_array<int>(class_loader_data(), m->length(), CHECK);
452 for (int i = 0; i < m->length(); i++) {
453 _method_ordering->at_put(i, m->at(i));
454 }
455 } else {
456 _method_ordering = Universe::the_empty_int_array();
457 }
458 }
459
460 // create a new array of vtable_indices for default methods
461 Array<int>* InstanceKlass::create_new_default_vtable_indices(int len, TRAPS) {
462 Array<int>* vtable_indices = MetadataFactory::new_array<int>(class_loader_data(), len, CHECK_NULL);
463 assert(default_vtable_indices() == NULL, "only create once");
464 set_default_vtable_indices(vtable_indices);
465 return vtable_indices;
466 }
467
468 InstanceKlass::InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id) :
469 Klass(id),
470 _nest_members(NULL),
471 _nest_host_index(0),
472 _nest_host(NULL),
473 _static_field_size(parser.static_field_size()),
474 _nonstatic_oop_map_size(nonstatic_oop_map_size(parser.total_oop_map_count())),
475 _itable_len(parser.itable_size()),
476 _extra_flags(0),
477 _init_thread(NULL),
478 _init_state(allocated),
479 _reference_type(parser.reference_type()),
480 _adr_valueklass_fixed_block(NULL)
481 {
482 set_vtable_length(parser.vtable_size());
483 set_kind(kind);
484 set_access_flags(parser.access_flags());
485 set_is_unsafe_anonymous(parser.is_unsafe_anonymous());
486 set_layout_helper(Klass::instance_layout_helper(parser.layout_size(),
487 false));
488 if (parser.has_flattenable_fields()) {
489 set_has_value_fields();
490 }
491 _java_fields_count = parser.java_fields_count();
492
493 assert(NULL == _methods, "underlying memory not zeroed?");
494 assert(is_instance_klass(), "is layout incorrect?");
495 assert(size_helper() == parser.layout_size(), "incorrect size_helper?");
496
497 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
498 SystemDictionaryShared::init_dumptime_info(this);
499 }
500 }
501
502 void InstanceKlass::deallocate_methods(ClassLoaderData* loader_data,
503 Array<Method*>* methods) {
504 if (methods != NULL && methods != Universe::the_empty_method_array() &&
505 !methods->is_shared()) {
506 for (int i = 0; i < methods->length(); i++) {
507 Method* method = methods->at(i);
508 if (method == NULL) continue; // maybe null if error processing
509 // Only want to delete methods that are not executing for RedefineClasses.
510 // The previous version will point to them so they're not totally dangling
511 assert (!method->on_stack(), "shouldn't be called with methods on stack");
512 MetadataFactory::free_metadata(loader_data, method);
513 }
514 MetadataFactory::free_array<Method*>(loader_data, methods);
515 }
516 }
517
518 void InstanceKlass::deallocate_interfaces(ClassLoaderData* loader_data,
519 const Klass* super_klass,
520 Array<InstanceKlass*>* local_interfaces,
521 Array<InstanceKlass*>* transitive_interfaces) {
522 // Only deallocate transitive interfaces if not empty, same as super class
523 // or same as local interfaces. See code in parseClassFile.
524 Array<InstanceKlass*>* ti = transitive_interfaces;
525 if (ti != Universe::the_empty_instance_klass_array() && ti != local_interfaces) {
526 // check that the interfaces don't come from super class
527 Array<InstanceKlass*>* sti = (super_klass == NULL) ? NULL :
528 InstanceKlass::cast(super_klass)->transitive_interfaces();
529 if (ti != sti && ti != NULL && !ti->is_shared()) {
530 MetadataFactory::free_array<InstanceKlass*>(loader_data, ti);
531 }
532 }
533
534 // local interfaces can be empty
535 if (local_interfaces != Universe::the_empty_instance_klass_array() &&
536 local_interfaces != NULL && !local_interfaces->is_shared()) {
537 MetadataFactory::free_array<InstanceKlass*>(loader_data, local_interfaces);
538 }
539 }
540
541 // This function deallocates the metadata and C heap pointers that the
542 // InstanceKlass points to.
543 void InstanceKlass::deallocate_contents(ClassLoaderData* loader_data) {
544
545 // Orphan the mirror first, CMS thinks it's still live.
546 if (java_mirror() != NULL) {
547 java_lang_Class::set_klass(java_mirror(), NULL);
548 }
549
550 // Also remove mirror from handles
551 loader_data->remove_handle(_java_mirror);
552
553 // Need to take this class off the class loader data list.
554 loader_data->remove_class(this);
555
556 // The array_klass for this class is created later, after error handling.
557 // For class redefinition, we keep the original class so this scratch class
558 // doesn't have an array class. Either way, assert that there is nothing
559 // to deallocate.
560 assert(array_klasses() == NULL, "array classes shouldn't be created for this class yet");
561
562 // Release C heap allocated data that this might point to, which includes
563 // reference counting symbol names.
564 release_C_heap_structures();
565
566 deallocate_methods(loader_data, methods());
567 set_methods(NULL);
568
569 if (method_ordering() != NULL &&
570 method_ordering() != Universe::the_empty_int_array() &&
571 !method_ordering()->is_shared()) {
572 MetadataFactory::free_array<int>(loader_data, method_ordering());
573 }
574 set_method_ordering(NULL);
575
576 // default methods can be empty
577 if (default_methods() != NULL &&
578 default_methods() != Universe::the_empty_method_array() &&
579 !default_methods()->is_shared()) {
580 MetadataFactory::free_array<Method*>(loader_data, default_methods());
581 }
582 // Do NOT deallocate the default methods, they are owned by superinterfaces.
583 set_default_methods(NULL);
584
585 // default methods vtable indices can be empty
586 if (default_vtable_indices() != NULL &&
587 !default_vtable_indices()->is_shared()) {
588 MetadataFactory::free_array<int>(loader_data, default_vtable_indices());
589 }
590 set_default_vtable_indices(NULL);
591
592
593 // This array is in Klass, but remove it with the InstanceKlass since
594 // this place would be the only caller and it can share memory with transitive
595 // interfaces.
596 if (secondary_supers() != NULL &&
597 secondary_supers() != Universe::the_empty_klass_array() &&
598 // see comments in compute_secondary_supers about the following cast
599 (address)(secondary_supers()) != (address)(transitive_interfaces()) &&
600 !secondary_supers()->is_shared()) {
601 MetadataFactory::free_array<Klass*>(loader_data, secondary_supers());
602 }
603 set_secondary_supers(NULL);
604
605 deallocate_interfaces(loader_data, super(), local_interfaces(), transitive_interfaces());
606 set_transitive_interfaces(NULL);
607 set_local_interfaces(NULL);
608
609 if (fields() != NULL && !fields()->is_shared()) {
610 MetadataFactory::free_array<jushort>(loader_data, fields());
611 }
612 set_fields(NULL, 0);
613
614 // If a method from a redefined class is using this constant pool, don't
615 // delete it, yet. The new class's previous version will point to this.
616 if (constants() != NULL) {
617 assert (!constants()->on_stack(), "shouldn't be called if anything is onstack");
618 if (!constants()->is_shared()) {
619 MetadataFactory::free_metadata(loader_data, constants());
620 }
621 // Delete any cached resolution errors for the constant pool
622 SystemDictionary::delete_resolution_error(constants());
623
624 set_constants(NULL);
625 }
626
627 if (inner_classes() != NULL &&
628 inner_classes() != Universe::the_empty_short_array() &&
629 !inner_classes()->is_shared()) {
630 MetadataFactory::free_array<jushort>(loader_data, inner_classes());
631 }
632 set_inner_classes(NULL);
633
634 if (nest_members() != NULL &&
635 nest_members() != Universe::the_empty_short_array() &&
636 !nest_members()->is_shared()) {
637 MetadataFactory::free_array<jushort>(loader_data, nest_members());
638 }
639 set_nest_members(NULL);
640
641 // We should deallocate the Annotations instance if it's not in shared spaces.
642 if (annotations() != NULL && !annotations()->is_shared()) {
643 MetadataFactory::free_metadata(loader_data, annotations());
644 }
645 set_annotations(NULL);
646
647 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
648 SystemDictionaryShared::remove_dumptime_info(this);
649 }
650 }
651
652 bool InstanceKlass::should_be_initialized() const {
653 return !is_initialized();
654 }
655
656 klassItable InstanceKlass::itable() const {
657 return klassItable(const_cast<InstanceKlass*>(this));
658 }
659
660 void InstanceKlass::eager_initialize(Thread *thread) {
661 if (!EagerInitialization) return;
662
663 if (this->is_not_initialized()) {
664 // abort if the the class has a class initializer
665 if (this->class_initializer() != NULL) return;
666
667 // abort if it is java.lang.Object (initialization is handled in genesis)
668 Klass* super_klass = super();
669 if (super_klass == NULL) return;
670
671 // abort if the super class should be initialized
672 if (!InstanceKlass::cast(super_klass)->is_initialized()) return;
673
674 // call body to expose the this pointer
675 eager_initialize_impl();
676 }
677 }
678
679 // JVMTI spec thinks there are signers and protection domain in the
680 // instanceKlass. These accessors pretend these fields are there.
681 // The hprof specification also thinks these fields are in InstanceKlass.
682 oop InstanceKlass::protection_domain() const {
683 // return the protection_domain from the mirror
684 return java_lang_Class::protection_domain(java_mirror());
685 }
686
687 // To remove these from requires an incompatible change and CCC request.
688 objArrayOop InstanceKlass::signers() const {
689 // return the signers from the mirror
690 return java_lang_Class::signers(java_mirror());
691 }
692
693 oop InstanceKlass::init_lock() const {
694 // return the init lock from the mirror
695 oop lock = java_lang_Class::init_lock(java_mirror());
696 // Prevent reordering with any access of initialization state
697 OrderAccess::loadload();
698 assert((oop)lock != NULL || !is_not_initialized(), // initialized or in_error state
699 "only fully initialized state can have a null lock");
700 return lock;
701 }
702
703 // Set the initialization lock to null so the object can be GC'ed. Any racing
704 // threads to get this lock will see a null lock and will not lock.
705 // That's okay because they all check for initialized state after getting
706 // the lock and return.
707 void InstanceKlass::fence_and_clear_init_lock() {
708 // make sure previous stores are all done, notably the init_state.
709 OrderAccess::storestore();
710 java_lang_Class::set_init_lock(java_mirror(), NULL);
711 assert(!is_not_initialized(), "class must be initialized now");
712 }
713
714 void InstanceKlass::eager_initialize_impl() {
715 EXCEPTION_MARK;
716 HandleMark hm(THREAD);
717 Handle h_init_lock(THREAD, init_lock());
718 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
719
720 // abort if someone beat us to the initialization
721 if (!is_not_initialized()) return; // note: not equivalent to is_initialized()
722
723 ClassState old_state = init_state();
724 link_class_impl(THREAD);
725 if (HAS_PENDING_EXCEPTION) {
726 CLEAR_PENDING_EXCEPTION;
727 // Abort if linking the class throws an exception.
728
729 // Use a test to avoid redundantly resetting the state if there's
730 // no change. Set_init_state() asserts that state changes make
731 // progress, whereas here we might just be spinning in place.
732 if (old_state != _init_state)
733 set_init_state(old_state);
734 } else {
735 // linking successfull, mark class as initialized
736 set_init_state(fully_initialized);
737 fence_and_clear_init_lock();
738 // trace
739 if (log_is_enabled(Info, class, init)) {
740 ResourceMark rm(THREAD);
741 log_info(class, init)("[Initialized %s without side effects]", external_name());
742 }
743 }
744 }
745
746
747 // See "The Virtual Machine Specification" section 2.16.5 for a detailed explanation of the class initialization
748 // process. The step comments refers to the procedure described in that section.
749 // Note: implementation moved to static method to expose the this pointer.
750 void InstanceKlass::initialize(TRAPS) {
751 if (this->should_be_initialized()) {
752 initialize_impl(CHECK);
753 // Note: at this point the class may be initialized
754 // OR it may be in the state of being initialized
755 // in case of recursive initialization!
756 } else {
757 assert(is_initialized(), "sanity check");
758 }
759 }
760
761
762 bool InstanceKlass::verify_code(TRAPS) {
763 // 1) Verify the bytecodes
764 return Verifier::verify(this, should_verify_class(), THREAD);
765 }
766
767 void InstanceKlass::link_class(TRAPS) {
768 assert(is_loaded(), "must be loaded");
769 if (!is_linked()) {
770 link_class_impl(CHECK);
771 }
772 }
773
774 // Called to verify that a class can link during initialization, without
775 // throwing a VerifyError.
776 bool InstanceKlass::link_class_or_fail(TRAPS) {
777 assert(is_loaded(), "must be loaded");
778 if (!is_linked()) {
779 link_class_impl(CHECK_false);
780 }
781 return is_linked();
782 }
783
784 bool InstanceKlass::link_class_impl(TRAPS) {
785 if (DumpSharedSpaces && is_in_error_state()) {
786 // This is for CDS dumping phase only -- we use the in_error_state to indicate that
787 // the class has failed verification. Throwing the NoClassDefFoundError here is just
788 // a convenient way to stop repeat attempts to verify the same (bad) class.
789 //
790 // Note that the NoClassDefFoundError is not part of the JLS, and should not be thrown
791 // if we are executing Java code. This is not a problem for CDS dumping phase since
792 // it doesn't execute any Java code.
793 ResourceMark rm(THREAD);
794 Exceptions::fthrow(THREAD_AND_LOCATION,
795 vmSymbols::java_lang_NoClassDefFoundError(),
796 "Class %s, or one of its supertypes, failed class initialization",
797 external_name());
798 return false;
799 }
800 // return if already verified
801 if (is_linked()) {
802 return true;
803 }
804
805 // Timing
806 // timer handles recursion
807 assert(THREAD->is_Java_thread(), "non-JavaThread in link_class_impl");
808 JavaThread* jt = (JavaThread*)THREAD;
809
810 // link super class before linking this class
811 Klass* super_klass = super();
812 if (super_klass != NULL) {
813 if (super_klass->is_interface()) { // check if super class is an interface
814 ResourceMark rm(THREAD);
815 Exceptions::fthrow(
816 THREAD_AND_LOCATION,
817 vmSymbols::java_lang_IncompatibleClassChangeError(),
818 "class %s has interface %s as super class",
819 external_name(),
820 super_klass->external_name()
821 );
822 return false;
823 }
824
825 InstanceKlass* ik_super = InstanceKlass::cast(super_klass);
826 ik_super->link_class_impl(CHECK_false);
827 }
828
829 // link all interfaces implemented by this class before linking this class
830 Array<InstanceKlass*>* interfaces = local_interfaces();
831 int num_interfaces = interfaces->length();
832 for (int index = 0; index < num_interfaces; index++) {
833 InstanceKlass* interk = interfaces->at(index);
834 interk->link_class_impl(CHECK_false);
835 }
836
837
838 // If a class declares a method that uses a value class as an argument
839 // type or return value type, this value class must be loaded during the
840 // linking of this class because size and properties of the value class
841 // must be known in order to be able to perform value type optimizations.
842 // The implementation below is an approximation of this rule, the code
843 // iterates over all methods of the current class (including overridden
844 // methods), not only the methods declared by this class. This
845 // approximation makes the code simpler, and doesn't change the semantic
846 // because classes declaring methods overridden by the current class are
847 // linked (and have performed their own pre-loading) before the linking
848 // of the current class.
849 // This is also the moment to detect potential mismatch between the
850 // ValueTypes attribute and the kind of the class effectively loaded.
851
852
853 // Note:
854 // Value class types used for flattenable fields are loaded during
855 // the loading phase (see ClassFileParser::post_process_parsed_stream()).
856 // Value class types used as element types for array creation
857 // are not pre-loaded. Their loading is triggered by either anewarray
858 // or multianewarray bytecodes.
859
860 // Could it be possible to do the following processing only if the
861 // class uses value types?
862 {
863 ResourceMark rm(THREAD);
864 for (int i = 0; i < methods()->length(); i++) {
865 Method* m = methods()->at(i);
866 for (SignatureStream ss(m->signature()); !ss.is_done(); ss.next()) {
867 Symbol* sig = ss.as_symbol();
868 if (ss.is_object()) {
869 Symbol* symb = sig;
870 if (ss.is_array()) {
871 int i=0;
872 while (sig->char_at(i) == '[') i++;
873 if (i == sig->utf8_length() - 1 ) continue; // primitive array
874 symb = SymbolTable::new_symbol(sig->as_C_string() + i + 1,
875 sig->utf8_length() - 3);
876 }
877 if (ss.type() == T_VALUETYPE) {
878 oop loader = class_loader();
879 oop protection_domain = this->protection_domain();
880 Klass* klass = SystemDictionary::resolve_or_fail(symb,
881 Handle(THREAD, loader), Handle(THREAD, protection_domain), true,
882 CHECK_false);
883 if (symb != sig) {
884 symb->decrement_refcount();
885 }
886 if (klass == NULL) {
887 THROW_(vmSymbols::java_lang_LinkageError(), false);
888 }
889 if (!klass->is_value()) {
890 THROW_(vmSymbols::java_lang_IncompatibleClassChangeError(), false);
891 }
892 }
893 }
894 }
895 }
896 }
897
898 // in case the class is linked in the process of linking its superclasses
899 if (is_linked()) {
900 return true;
901 }
902
903 // trace only the link time for this klass that includes
904 // the verification time
905 PerfClassTraceTime vmtimer(ClassLoader::perf_class_link_time(),
906 ClassLoader::perf_class_link_selftime(),
907 ClassLoader::perf_classes_linked(),
908 jt->get_thread_stat()->perf_recursion_counts_addr(),
909 jt->get_thread_stat()->perf_timers_addr(),
910 PerfClassTraceTime::CLASS_LINK);
911
912 // verification & rewriting
913 {
914 HandleMark hm(THREAD);
915 Handle h_init_lock(THREAD, init_lock());
916 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
917 // rewritten will have been set if loader constraint error found
918 // on an earlier link attempt
919 // don't verify or rewrite if already rewritten
920 //
921
922 if (!is_linked()) {
923 if (!is_rewritten()) {
924 {
925 bool verify_ok = verify_code(THREAD);
926 if (!verify_ok) {
927 return false;
928 }
929 }
930
931 // Just in case a side-effect of verify linked this class already
932 // (which can sometimes happen since the verifier loads classes
933 // using custom class loaders, which are free to initialize things)
934 if (is_linked()) {
935 return true;
936 }
937
938 // also sets rewritten
939 rewrite_class(CHECK_false);
940 } else if (is_shared()) {
941 SystemDictionaryShared::check_verification_constraints(this, CHECK_false);
942 }
943
944 // relocate jsrs and link methods after they are all rewritten
945 link_methods(CHECK_false);
946
947 // Initialize the vtable and interface table after
948 // methods have been rewritten since rewrite may
949 // fabricate new Method*s.
950 // also does loader constraint checking
951 //
952 // initialize_vtable and initialize_itable need to be rerun for
953 // a shared class if the class is not loaded by the NULL classloader.
954 ClassLoaderData * loader_data = class_loader_data();
955 if (!(is_shared() &&
956 loader_data->is_the_null_class_loader_data())) {
957 vtable().initialize_vtable(true, CHECK_false);
958 itable().initialize_itable(true, CHECK_false);
959 }
960 #ifdef ASSERT
961 else {
962 vtable().verify(tty, true);
963 // In case itable verification is ever added.
964 // itable().verify(tty, true);
965 }
966 #endif
967
968 set_init_state(linked);
969 if (JvmtiExport::should_post_class_prepare()) {
970 Thread *thread = THREAD;
971 assert(thread->is_Java_thread(), "thread->is_Java_thread()");
972 JvmtiExport::post_class_prepare((JavaThread *) thread, this);
973 }
974 }
975 }
976 return true;
977 }
978
979 // Rewrite the byte codes of all of the methods of a class.
980 // The rewriter must be called exactly once. Rewriting must happen after
981 // verification but before the first method of the class is executed.
982 void InstanceKlass::rewrite_class(TRAPS) {
983 assert(is_loaded(), "must be loaded");
984 if (is_rewritten()) {
985 assert(is_shared(), "rewriting an unshared class?");
986 return;
987 }
988 Rewriter::rewrite(this, CHECK);
989 set_rewritten();
990 }
991
992 // Now relocate and link method entry points after class is rewritten.
993 // This is outside is_rewritten flag. In case of an exception, it can be
994 // executed more than once.
995 void InstanceKlass::link_methods(TRAPS) {
996 int len = methods()->length();
997 for (int i = len-1; i >= 0; i--) {
998 methodHandle m(THREAD, methods()->at(i));
999
1000 // Set up method entry points for compiler and interpreter .
1001 m->link_method(m, CHECK);
1002 }
1003 }
1004
1005 // Eagerly initialize superinterfaces that declare default methods (concrete instance: any access)
1006 void InstanceKlass::initialize_super_interfaces(TRAPS) {
1007 assert (has_nonstatic_concrete_methods(), "caller should have checked this");
1008 for (int i = 0; i < local_interfaces()->length(); ++i) {
1009 InstanceKlass* ik = local_interfaces()->at(i);
1010
1011 // Initialization is depth first search ie. we start with top of the inheritance tree
1012 // has_nonstatic_concrete_methods drives searching superinterfaces since it
1013 // means has_nonstatic_concrete_methods in its superinterface hierarchy
1014 if (ik->has_nonstatic_concrete_methods()) {
1015 ik->initialize_super_interfaces(CHECK);
1016 }
1017
1018 // Only initialize() interfaces that "declare" concrete methods.
1019 if (ik->should_be_initialized() && ik->declares_nonstatic_concrete_methods()) {
1020 ik->initialize(CHECK);
1021 }
1022 }
1023 }
1024
1025 void InstanceKlass::initialize_impl(TRAPS) {
1026 HandleMark hm(THREAD);
1027
1028 // Make sure klass is linked (verified) before initialization
1029 // A class could already be verified, since it has been reflected upon.
1030 link_class(CHECK);
1031
1032 DTRACE_CLASSINIT_PROBE(required, -1);
1033
1034 bool wait = false;
1035
1036 assert(THREAD->is_Java_thread(), "non-JavaThread in initialize_impl");
1037 JavaThread* jt = (JavaThread*)THREAD;
1038
1039 // refer to the JVM book page 47 for description of steps
1040 // Step 1
1041 {
1042 Handle h_init_lock(THREAD, init_lock());
1043 ObjectLocker ol(h_init_lock, THREAD, h_init_lock() != NULL);
1044
1045 // Step 2
1046 // If we were to use wait() instead of waitInterruptibly() then
1047 // we might end up throwing IE from link/symbol resolution sites
1048 // that aren't expected to throw. This would wreak havoc. See 6320309.
1049 while (is_being_initialized() && !is_reentrant_initialization(jt)) {
1050 wait = true;
1051 jt->set_class_to_be_initialized(this);
1052 ol.wait_uninterruptibly(jt);
1053 jt->set_class_to_be_initialized(NULL);
1054 }
1055
1056 // Step 3
1057 if (is_being_initialized() && is_reentrant_initialization(jt)) {
1058 DTRACE_CLASSINIT_PROBE_WAIT(recursive, -1, wait);
1059 return;
1060 }
1061
1062 // Step 4
1063 if (is_initialized()) {
1064 DTRACE_CLASSINIT_PROBE_WAIT(concurrent, -1, wait);
1065 return;
1066 }
1067
1068 // Step 5
1069 if (is_in_error_state()) {
1070 DTRACE_CLASSINIT_PROBE_WAIT(erroneous, -1, wait);
1071 ResourceMark rm(THREAD);
1072 const char* desc = "Could not initialize class ";
1073 const char* className = external_name();
1074 size_t msglen = strlen(desc) + strlen(className) + 1;
1075 char* message = NEW_RESOURCE_ARRAY(char, msglen);
1076 if (NULL == message) {
1077 // Out of memory: can't create detailed error message
1078 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), className);
1079 } else {
1080 jio_snprintf(message, msglen, "%s%s", desc, className);
1081 THROW_MSG(vmSymbols::java_lang_NoClassDefFoundError(), message);
1082 }
1083 }
1084
1085 // Step 6
1086 set_init_state(being_initialized);
1087 set_init_thread(jt);
1088 }
1089
1090 // Step 7
1091 // Next, if C is a class rather than an interface, initialize it's super class and super
1092 // interfaces.
1093 if (!is_interface()) {
1094 Klass* super_klass = super();
1095 if (super_klass != NULL && super_klass->should_be_initialized()) {
1096 super_klass->initialize(THREAD);
1097 }
1098 // If C implements any interface that declares a non-static, concrete method,
1099 // the initialization of C triggers initialization of its super interfaces.
1100 // Only need to recurse if has_nonstatic_concrete_methods which includes declaring and
1101 // having a superinterface that declares, non-static, concrete methods
1102 if (!HAS_PENDING_EXCEPTION && has_nonstatic_concrete_methods()) {
1103 initialize_super_interfaces(THREAD);
1104 }
1105
1106 // If any exceptions, complete abruptly, throwing the same exception as above.
1107 if (HAS_PENDING_EXCEPTION) {
1108 Handle e(THREAD, PENDING_EXCEPTION);
1109 CLEAR_PENDING_EXCEPTION;
1110 {
1111 EXCEPTION_MARK;
1112 // Locks object, set state, and notify all waiting threads
1113 set_initialization_state_and_notify(initialization_error, THREAD);
1114 CLEAR_PENDING_EXCEPTION;
1115 }
1116 DTRACE_CLASSINIT_PROBE_WAIT(super__failed, -1, wait);
1117 THROW_OOP(e());
1118 }
1119 }
1120
1121 // Step 8
1122 // Initialize classes of flattenable fields
1123 {
1124 for (AllFieldStream fs(this); !fs.done(); fs.next()) {
1125 if (fs.is_flattenable()) {
1126 Klass* klass = this->get_value_field_klass_or_null(fs.index());
1127 if (klass == NULL) {
1128 assert(fs.access_flags().is_static() && fs.access_flags().is_flattenable(),
1129 "Otherwise should have been pre-loaded");
1130 klass = SystemDictionary::resolve_or_fail(field_signature(fs.index())->fundamental_name(THREAD),
1131 Handle(THREAD, class_loader()),
1132 Handle(THREAD, protection_domain()),
1133 true, CHECK);
1134 if (klass == NULL) {
1135 THROW(vmSymbols::java_lang_NoClassDefFoundError());
1136 }
1137 if (!klass->is_value()) {
1138 THROW(vmSymbols::java_lang_IncompatibleClassChangeError());
1139 }
1140 this->set_value_field_klass(fs.index(), klass);
1141 }
1142 InstanceKlass::cast(klass)->initialize(CHECK);
1143 if (fs.access_flags().is_static()) {
1144 if (java_mirror()->obj_field(fs.offset()) == NULL) {
1145 java_mirror()->obj_field_put(fs.offset(), ValueKlass::cast(klass)->default_value());
1146 }
1147 }
1148 }
1149 }
1150 }
1151
1152
1153 // Look for aot compiled methods for this klass, including class initializer.
1154 AOTLoader::load_for_klass(this, THREAD);
1155
1156 // Step 9
1157 {
1158 DTRACE_CLASSINIT_PROBE_WAIT(clinit, -1, wait);
1159 // Timer includes any side effects of class initialization (resolution,
1160 // etc), but not recursive entry into call_class_initializer().
1161 PerfClassTraceTime timer(ClassLoader::perf_class_init_time(),
1162 ClassLoader::perf_class_init_selftime(),
1163 ClassLoader::perf_classes_inited(),
1164 jt->get_thread_stat()->perf_recursion_counts_addr(),
1165 jt->get_thread_stat()->perf_timers_addr(),
1166 PerfClassTraceTime::CLASS_CLINIT);
1167 call_class_initializer(THREAD);
1168 }
1169
1170 // Step 10
1171 if (!HAS_PENDING_EXCEPTION) {
1172 set_initialization_state_and_notify(fully_initialized, CHECK);
1173 {
1174 debug_only(vtable().verify(tty, true);)
1175 }
1176 }
1177 else {
1178 // Step 11 and 12
1179 Handle e(THREAD, PENDING_EXCEPTION);
1180 CLEAR_PENDING_EXCEPTION;
1181 // JVMTI has already reported the pending exception
1182 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1183 JvmtiExport::clear_detected_exception(jt);
1184 {
1185 EXCEPTION_MARK;
1186 set_initialization_state_and_notify(initialization_error, THREAD);
1187 CLEAR_PENDING_EXCEPTION; // ignore any exception thrown, class initialization error is thrown below
1188 // JVMTI has already reported the pending exception
1189 // JVMTI internal flag reset is needed in order to report ExceptionInInitializerError
1190 JvmtiExport::clear_detected_exception(jt);
1191 }
1192 DTRACE_CLASSINIT_PROBE_WAIT(error, -1, wait);
1193 if (e->is_a(SystemDictionary::Error_klass())) {
1194 THROW_OOP(e());
1195 } else {
1196 JavaCallArguments args(e);
1197 THROW_ARG(vmSymbols::java_lang_ExceptionInInitializerError(),
1198 vmSymbols::throwable_void_signature(),
1199 &args);
1200 }
1201 }
1202 DTRACE_CLASSINIT_PROBE_WAIT(end, -1, wait);
1203 }
1204
1205
1206 void InstanceKlass::set_initialization_state_and_notify(ClassState state, TRAPS) {
1207 Handle h_init_lock(THREAD, init_lock());
1208 if (h_init_lock() != NULL) {
1209 ObjectLocker ol(h_init_lock, THREAD);
1210 set_init_thread(NULL); // reset _init_thread before changing _init_state
1211 set_init_state(state);
1212 fence_and_clear_init_lock();
1213 ol.notify_all(CHECK);
1214 } else {
1215 assert(h_init_lock() != NULL, "The initialization state should never be set twice");
1216 set_init_thread(NULL); // reset _init_thread before changing _init_state
1217 set_init_state(state);
1218 }
1219 }
1220
1221 Klass* InstanceKlass::implementor() const {
1222 Klass* volatile* k = adr_implementor();
1223 if (k == NULL) {
1224 return NULL;
1225 } else {
1226 // This load races with inserts, and therefore needs acquire.
1227 Klass* kls = OrderAccess::load_acquire(k);
1228 if (kls != NULL && !kls->is_loader_alive()) {
1229 return NULL; // don't return unloaded class
1230 } else {
1231 return kls;
1232 }
1233 }
1234 }
1235
1236
1237 void InstanceKlass::set_implementor(Klass* k) {
1238 assert_lock_strong(Compile_lock);
1239 assert(is_interface(), "not interface");
1240 Klass* volatile* addr = adr_implementor();
1241 assert(addr != NULL, "null addr");
1242 if (addr != NULL) {
1243 OrderAccess::release_store(addr, k);
1244 }
1245 }
1246
1247 int InstanceKlass::nof_implementors() const {
1248 Klass* k = implementor();
1249 if (k == NULL) {
1250 return 0;
1251 } else if (k != this) {
1252 return 1;
1253 } else {
1254 return 2;
1255 }
1256 }
1257
1258 // The embedded _implementor field can only record one implementor.
1259 // When there are more than one implementors, the _implementor field
1260 // is set to the interface Klass* itself. Following are the possible
1261 // values for the _implementor field:
1262 // NULL - no implementor
1263 // implementor Klass* - one implementor
1264 // self - more than one implementor
1265 //
1266 // The _implementor field only exists for interfaces.
1267 void InstanceKlass::add_implementor(Klass* k) {
1268 assert_lock_strong(Compile_lock);
1269 assert(is_interface(), "not interface");
1270 // Filter out my subinterfaces.
1271 // (Note: Interfaces are never on the subklass list.)
1272 if (InstanceKlass::cast(k)->is_interface()) return;
1273
1274 // Filter out subclasses whose supers already implement me.
1275 // (Note: CHA must walk subclasses of direct implementors
1276 // in order to locate indirect implementors.)
1277 Klass* sk = k->super();
1278 if (sk != NULL && InstanceKlass::cast(sk)->implements_interface(this))
1279 // We only need to check one immediate superclass, since the
1280 // implements_interface query looks at transitive_interfaces.
1281 // Any supers of the super have the same (or fewer) transitive_interfaces.
1282 return;
1283
1284 Klass* ik = implementor();
1285 if (ik == NULL) {
1286 set_implementor(k);
1287 } else if (ik != this) {
1288 // There is already an implementor. Use itself as an indicator of
1289 // more than one implementors.
1290 set_implementor(this);
1291 }
1292
1293 // The implementor also implements the transitive_interfaces
1294 for (int index = 0; index < local_interfaces()->length(); index++) {
1295 InstanceKlass::cast(local_interfaces()->at(index))->add_implementor(k);
1296 }
1297 }
1298
1299 void InstanceKlass::init_implementor() {
1300 if (is_interface()) {
1301 set_implementor(NULL);
1302 }
1303 }
1304
1305
1306 void InstanceKlass::process_interfaces(Thread *thread) {
1307 // link this class into the implementors list of every interface it implements
1308 for (int i = local_interfaces()->length() - 1; i >= 0; i--) {
1309 assert(local_interfaces()->at(i)->is_klass(), "must be a klass");
1310 InstanceKlass* interf = InstanceKlass::cast(local_interfaces()->at(i));
1311 assert(interf->is_interface(), "expected interface");
1312 interf->add_implementor(this);
1313 }
1314 }
1315
1316 bool InstanceKlass::can_be_primary_super_slow() const {
1317 if (is_interface())
1318 return false;
1319 else
1320 return Klass::can_be_primary_super_slow();
1321 }
1322
1323 GrowableArray<Klass*>* InstanceKlass::compute_secondary_supers(int num_extra_slots,
1324 Array<InstanceKlass*>* transitive_interfaces) {
1325 // The secondaries are the implemented interfaces.
1326 Array<InstanceKlass*>* interfaces = transitive_interfaces;
1327 int num_secondaries = num_extra_slots + interfaces->length();
1328 if (num_secondaries == 0) {
1329 // Must share this for correct bootstrapping!
1330 set_secondary_supers(Universe::the_empty_klass_array());
1331 return NULL;
1332 } else if (num_extra_slots == 0) {
1333 // The secondary super list is exactly the same as the transitive interfaces, so
1334 // let's use it instead of making a copy.
1335 // Redefine classes has to be careful not to delete this!
1336 // We need the cast because Array<Klass*> is NOT a supertype of Array<InstanceKlass*>,
1337 // (but it's safe to do here because we won't write into _secondary_supers from this point on).
1338 set_secondary_supers((Array<Klass*>*)(address)interfaces);
1339 return NULL;
1340 } else {
1341 // Copy transitive interfaces to a temporary growable array to be constructed
1342 // into the secondary super list with extra slots.
1343 GrowableArray<Klass*>* secondaries = new GrowableArray<Klass*>(interfaces->length());
1344 for (int i = 0; i < interfaces->length(); i++) {
1345 secondaries->push(interfaces->at(i));
1346 }
1347 return secondaries;
1348 }
1349 }
1350
1351 bool InstanceKlass::implements_interface(Klass* k) const {
1352 if (this == k) return true;
1353 assert(k->is_interface(), "should be an interface class");
1354 for (int i = 0; i < transitive_interfaces()->length(); i++) {
1355 if (transitive_interfaces()->at(i) == k) {
1356 return true;
1357 }
1358 }
1359 return false;
1360 }
1361
1362 bool InstanceKlass::is_same_or_direct_interface(Klass *k) const {
1363 // Verify direct super interface
1364 if (this == k) return true;
1365 assert(k->is_interface(), "should be an interface class");
1366 for (int i = 0; i < local_interfaces()->length(); i++) {
1367 if (local_interfaces()->at(i) == k) {
1368 return true;
1369 }
1370 }
1371 return false;
1372 }
1373
1374 objArrayOop InstanceKlass::allocate_objArray(int n, int length, TRAPS) {
1375 check_array_allocation_length(length, arrayOopDesc::max_array_length(T_OBJECT), CHECK_NULL);
1376 int size = objArrayOopDesc::object_size(length);
1377 Klass* ak = array_klass(n, CHECK_NULL);
1378 objArrayOop o = (objArrayOop)Universe::heap()->array_allocate(ak, size, length,
1379 /* do_zero */ true, CHECK_NULL);
1380 return o;
1381 }
1382
1383 instanceOop InstanceKlass::register_finalizer(instanceOop i, TRAPS) {
1384 if (TraceFinalizerRegistration) {
1385 tty->print("Registered ");
1386 i->print_value_on(tty);
1387 tty->print_cr(" (" INTPTR_FORMAT ") as finalizable", p2i(i));
1388 }
1389 instanceHandle h_i(THREAD, i);
1390 // Pass the handle as argument, JavaCalls::call expects oop as jobjects
1391 JavaValue result(T_VOID);
1392 JavaCallArguments args(h_i);
1393 methodHandle mh (THREAD, Universe::finalizer_register_method());
1394 JavaCalls::call(&result, mh, &args, CHECK_NULL);
1395 return h_i();
1396 }
1397
1398 instanceOop InstanceKlass::allocate_instance(TRAPS) {
1399 bool has_finalizer_flag = has_finalizer(); // Query before possible GC
1400 int size = size_helper(); // Query before forming handle.
1401
1402 instanceOop i;
1403
1404 i = (instanceOop)Universe::heap()->obj_allocate(this, size, CHECK_NULL);
1405 if (has_finalizer_flag && !RegisterFinalizersAtInit) {
1406 i = register_finalizer(i, CHECK_NULL);
1407 }
1408 return i;
1409 }
1410
1411 instanceHandle InstanceKlass::allocate_instance_handle(TRAPS) {
1412 return instanceHandle(THREAD, allocate_instance(THREAD));
1413 }
1414
1415 void InstanceKlass::check_valid_for_instantiation(bool throwError, TRAPS) {
1416 if (is_interface() || is_abstract()) {
1417 ResourceMark rm(THREAD);
1418 THROW_MSG(throwError ? vmSymbols::java_lang_InstantiationError()
1419 : vmSymbols::java_lang_InstantiationException(), external_name());
1420 }
1421 if (this == SystemDictionary::Class_klass()) {
1422 ResourceMark rm(THREAD);
1423 THROW_MSG(throwError ? vmSymbols::java_lang_IllegalAccessError()
1424 : vmSymbols::java_lang_IllegalAccessException(), external_name());
1425 }
1426 }
1427
1428 Klass* InstanceKlass::array_klass_impl(ArrayStorageProperties storage_props, bool or_null, int n, TRAPS) {
1429 assert(storage_props.is_empty(), "Unexpected");
1430 // Need load-acquire for lock-free read
1431 if (array_klasses_acquire() == NULL) {
1432 if (or_null) return NULL;
1433
1434 ResourceMark rm;
1435 {
1436 // Atomic creation of array_klasses
1437 MutexLocker ma(MultiArray_lock, THREAD);
1438
1439 // Check if update has already taken place
1440 if (array_klasses() == NULL) {
1441 Klass* k = ObjArrayKlass::allocate_objArray_klass(storage_props, 1, this, CHECK_NULL);
1442 // use 'release' to pair with lock-free load
1443 release_set_array_klasses(k);
1444 }
1445 }
1446 }
1447 // _this will always be set at this point
1448 ObjArrayKlass* oak = (ObjArrayKlass*)array_klasses();
1449 if (or_null) {
1450 return oak->array_klass_or_null(storage_props, n);
1451 }
1452 return oak->array_klass(storage_props, n, THREAD);
1453 }
1454
1455 Klass* InstanceKlass::array_klass_impl(ArrayStorageProperties storage_props, bool or_null, TRAPS) {
1456 return array_klass_impl(storage_props, or_null, 1, THREAD);
1457 }
1458
1459 static int call_class_initializer_counter = 0; // for debugging
1460
1461 Method* InstanceKlass::class_initializer() const {
1462 Method* clinit = find_method(
1463 vmSymbols::class_initializer_name(), vmSymbols::void_method_signature());
1464 if (clinit != NULL && clinit->is_class_initializer()) {
1465 return clinit;
1466 }
1467 return NULL;
1468 }
1469
1470 void InstanceKlass::call_class_initializer(TRAPS) {
1471 if (ReplayCompiles &&
1472 (ReplaySuppressInitializers == 1 ||
1473 (ReplaySuppressInitializers >= 2 && class_loader() != NULL))) {
1474 // Hide the existence of the initializer for the purpose of replaying the compile
1475 return;
1476 }
1477
1478 methodHandle h_method(THREAD, class_initializer());
1479 assert(!is_initialized(), "we cannot initialize twice");
1480 LogTarget(Info, class, init) lt;
1481 if (lt.is_enabled()) {
1482 ResourceMark rm;
1483 LogStream ls(lt);
1484 ls.print("%d Initializing ", call_class_initializer_counter++);
1485 name()->print_value_on(&ls);
1486 ls.print_cr("%s (" INTPTR_FORMAT ")", h_method() == NULL ? "(no method)" : "", p2i(this));
1487 }
1488 if (h_method() != NULL) {
1489 JavaCallArguments args; // No arguments
1490 JavaValue result(T_VOID);
1491 JavaCalls::call(&result, h_method, &args, CHECK); // Static call (no args)
1492 }
1493 }
1494
1495
1496 void InstanceKlass::mask_for(const methodHandle& method, int bci,
1497 InterpreterOopMap* entry_for) {
1498 // Lazily create the _oop_map_cache at first request
1499 // Lock-free access requires load_acquire.
1500 OopMapCache* oop_map_cache = OrderAccess::load_acquire(&_oop_map_cache);
1501 if (oop_map_cache == NULL) {
1502 MutexLocker x(OopMapCacheAlloc_lock, Mutex::_no_safepoint_check_flag);
1503 // Check if _oop_map_cache was allocated while we were waiting for this lock
1504 if ((oop_map_cache = _oop_map_cache) == NULL) {
1505 oop_map_cache = new OopMapCache();
1506 // Ensure _oop_map_cache is stable, since it is examined without a lock
1507 OrderAccess::release_store(&_oop_map_cache, oop_map_cache);
1508 }
1509 }
1510 // _oop_map_cache is constant after init; lookup below does its own locking.
1511 oop_map_cache->lookup(method, bci, entry_for);
1512 }
1513
1514
1515 bool InstanceKlass::find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1516 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1517 Symbol* f_name = fs.name();
1518 Symbol* f_sig = fs.signature();
1519 if (f_name == name && f_sig == sig) {
1520 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1521 return true;
1522 }
1523 }
1524 return false;
1525 }
1526
1527
1528 Klass* InstanceKlass::find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1529 const int n = local_interfaces()->length();
1530 for (int i = 0; i < n; i++) {
1531 Klass* intf1 = local_interfaces()->at(i);
1532 assert(intf1->is_interface(), "just checking type");
1533 // search for field in current interface
1534 if (InstanceKlass::cast(intf1)->find_local_field(name, sig, fd)) {
1535 assert(fd->is_static(), "interface field must be static");
1536 return intf1;
1537 }
1538 // search for field in direct superinterfaces
1539 Klass* intf2 = InstanceKlass::cast(intf1)->find_interface_field(name, sig, fd);
1540 if (intf2 != NULL) return intf2;
1541 }
1542 // otherwise field lookup fails
1543 return NULL;
1544 }
1545
1546
1547 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const {
1548 // search order according to newest JVM spec (5.4.3.2, p.167).
1549 // 1) search for field in current klass
1550 if (find_local_field(name, sig, fd)) {
1551 return const_cast<InstanceKlass*>(this);
1552 }
1553 // 2) search for field recursively in direct superinterfaces
1554 { Klass* intf = find_interface_field(name, sig, fd);
1555 if (intf != NULL) return intf;
1556 }
1557 // 3) apply field lookup recursively if superclass exists
1558 { Klass* supr = super();
1559 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, fd);
1560 }
1561 // 4) otherwise field lookup fails
1562 return NULL;
1563 }
1564
1565
1566 Klass* InstanceKlass::find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const {
1567 // search order according to newest JVM spec (5.4.3.2, p.167).
1568 // 1) search for field in current klass
1569 if (find_local_field(name, sig, fd)) {
1570 if (fd->is_static() == is_static) return const_cast<InstanceKlass*>(this);
1571 }
1572 // 2) search for field recursively in direct superinterfaces
1573 if (is_static) {
1574 Klass* intf = find_interface_field(name, sig, fd);
1575 if (intf != NULL) return intf;
1576 }
1577 // 3) apply field lookup recursively if superclass exists
1578 { Klass* supr = super();
1579 if (supr != NULL) return InstanceKlass::cast(supr)->find_field(name, sig, is_static, fd);
1580 }
1581 // 4) otherwise field lookup fails
1582 return NULL;
1583 }
1584
1585
1586 bool InstanceKlass::find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1587 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1588 if (fs.offset() == offset) {
1589 fd->reinitialize(const_cast<InstanceKlass*>(this), fs.index());
1590 if (fd->is_static() == is_static) return true;
1591 }
1592 }
1593 return false;
1594 }
1595
1596
1597 bool InstanceKlass::find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const {
1598 Klass* klass = const_cast<InstanceKlass*>(this);
1599 while (klass != NULL) {
1600 if (InstanceKlass::cast(klass)->find_local_field_from_offset(offset, is_static, fd)) {
1601 return true;
1602 }
1603 klass = klass->super();
1604 }
1605 return false;
1606 }
1607
1608
1609 void InstanceKlass::methods_do(void f(Method* method)) {
1610 // Methods aren't stable until they are loaded. This can be read outside
1611 // a lock through the ClassLoaderData for profiling
1612 if (!is_loaded()) {
1613 return;
1614 }
1615
1616 int len = methods()->length();
1617 for (int index = 0; index < len; index++) {
1618 Method* m = methods()->at(index);
1619 assert(m->is_method(), "must be method");
1620 f(m);
1621 }
1622 }
1623
1624
1625 void InstanceKlass::do_local_static_fields(FieldClosure* cl) {
1626 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1627 if (fs.access_flags().is_static()) {
1628 fieldDescriptor& fd = fs.field_descriptor();
1629 cl->do_field(&fd);
1630 }
1631 }
1632 }
1633
1634
1635 void InstanceKlass::do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle mirror, TRAPS) {
1636 for (JavaFieldStream fs(this); !fs.done(); fs.next()) {
1637 if (fs.access_flags().is_static()) {
1638 fieldDescriptor& fd = fs.field_descriptor();
1639 f(&fd, mirror, CHECK);
1640 }
1641 }
1642 }
1643
1644
1645 static int compare_fields_by_offset(int* a, int* b) {
1646 return a[0] - b[0];
1647 }
1648
1649 void InstanceKlass::do_nonstatic_fields(FieldClosure* cl) {
1650 InstanceKlass* super = superklass();
1651 if (super != NULL) {
1652 super->do_nonstatic_fields(cl);
1653 }
1654 fieldDescriptor fd;
1655 int length = java_fields_count();
1656 // In DebugInfo nonstatic fields are sorted by offset.
1657 int* fields_sorted = NEW_C_HEAP_ARRAY(int, 2*(length+1), mtClass);
1658 int j = 0;
1659 for (int i = 0; i < length; i += 1) {
1660 fd.reinitialize(this, i);
1661 if (!fd.is_static()) {
1662 fields_sorted[j + 0] = fd.offset();
1663 fields_sorted[j + 1] = i;
1664 j += 2;
1665 }
1666 }
1667 if (j > 0) {
1668 length = j;
1669 // _sort_Fn is defined in growableArray.hpp.
1670 qsort(fields_sorted, length/2, 2*sizeof(int), (_sort_Fn)compare_fields_by_offset);
1671 for (int i = 0; i < length; i += 2) {
1672 fd.reinitialize(this, fields_sorted[i + 1]);
1673 assert(!fd.is_static() && fd.offset() == fields_sorted[i], "only nonstatic fields");
1674 cl->do_field(&fd);
1675 }
1676 }
1677 FREE_C_HEAP_ARRAY(int, fields_sorted);
1678 }
1679
1680
1681 void InstanceKlass::array_klasses_do(void f(Klass* k)) {
1682 if (array_klasses() != NULL)
1683 ArrayKlass::cast(array_klasses())->array_klasses_do(f);
1684 }
1685
1686 #ifdef ASSERT
1687 static int linear_search(const Array<Method*>* methods,
1688 const Symbol* name,
1689 const Symbol* signature) {
1690 const int len = methods->length();
1691 for (int index = 0; index < len; index++) {
1692 const Method* const m = methods->at(index);
1693 assert(m->is_method(), "must be method");
1694 if (m->signature() == signature && m->name() == name) {
1695 return index;
1696 }
1697 }
1698 return -1;
1699 }
1700 #endif
1701
1702 static int binary_search(const Array<Method*>* methods, const Symbol* name) {
1703 int len = methods->length();
1704 // methods are sorted, so do binary search
1705 int l = 0;
1706 int h = len - 1;
1707 while (l <= h) {
1708 int mid = (l + h) >> 1;
1709 Method* m = methods->at(mid);
1710 assert(m->is_method(), "must be method");
1711 int res = m->name()->fast_compare(name);
1712 if (res == 0) {
1713 return mid;
1714 } else if (res < 0) {
1715 l = mid + 1;
1716 } else {
1717 h = mid - 1;
1718 }
1719 }
1720 return -1;
1721 }
1722
1723 // find_method looks up the name/signature in the local methods array
1724 Method* InstanceKlass::find_method(const Symbol* name,
1725 const Symbol* signature) const {
1726 return find_method_impl(name, signature, find_overpass, find_static, find_private);
1727 }
1728
1729 Method* InstanceKlass::find_method_impl(const Symbol* name,
1730 const Symbol* signature,
1731 OverpassLookupMode overpass_mode,
1732 StaticLookupMode static_mode,
1733 PrivateLookupMode private_mode) const {
1734 return InstanceKlass::find_method_impl(methods(),
1735 name,
1736 signature,
1737 overpass_mode,
1738 static_mode,
1739 private_mode);
1740 }
1741
1742 // find_instance_method looks up the name/signature in the local methods array
1743 // and skips over static methods
1744 Method* InstanceKlass::find_instance_method(const Array<Method*>* methods,
1745 const Symbol* name,
1746 const Symbol* signature,
1747 PrivateLookupMode private_mode) {
1748 Method* const meth = InstanceKlass::find_method_impl(methods,
1749 name,
1750 signature,
1751 find_overpass,
1752 skip_static,
1753 private_mode);
1754 assert(((meth == NULL) || !meth->is_static()),
1755 "find_instance_method should have skipped statics");
1756 return meth;
1757 }
1758
1759 // find_instance_method looks up the name/signature in the local methods array
1760 // and skips over static methods
1761 Method* InstanceKlass::find_instance_method(const Symbol* name,
1762 const Symbol* signature,
1763 PrivateLookupMode private_mode) const {
1764 return InstanceKlass::find_instance_method(methods(), name, signature, private_mode);
1765 }
1766
1767 // Find looks up the name/signature in the local methods array
1768 // and filters on the overpass, static and private flags
1769 // This returns the first one found
1770 // note that the local methods array can have up to one overpass, one static
1771 // and one instance (private or not) with the same name/signature
1772 Method* InstanceKlass::find_local_method(const Symbol* name,
1773 const Symbol* signature,
1774 OverpassLookupMode overpass_mode,
1775 StaticLookupMode static_mode,
1776 PrivateLookupMode private_mode) const {
1777 return InstanceKlass::find_method_impl(methods(),
1778 name,
1779 signature,
1780 overpass_mode,
1781 static_mode,
1782 private_mode);
1783 }
1784
1785 // Find looks up the name/signature in the local methods array
1786 // and filters on the overpass, static and private flags
1787 // This returns the first one found
1788 // note that the local methods array can have up to one overpass, one static
1789 // and one instance (private or not) with the same name/signature
1790 Method* InstanceKlass::find_local_method(const Array<Method*>* methods,
1791 const Symbol* name,
1792 const Symbol* signature,
1793 OverpassLookupMode overpass_mode,
1794 StaticLookupMode static_mode,
1795 PrivateLookupMode private_mode) {
1796 return InstanceKlass::find_method_impl(methods,
1797 name,
1798 signature,
1799 overpass_mode,
1800 static_mode,
1801 private_mode);
1802 }
1803
1804 Method* InstanceKlass::find_method(const Array<Method*>* methods,
1805 const Symbol* name,
1806 const Symbol* signature) {
1807 return InstanceKlass::find_method_impl(methods,
1808 name,
1809 signature,
1810 find_overpass,
1811 find_static,
1812 find_private);
1813 }
1814
1815 Method* InstanceKlass::find_method_impl(const Array<Method*>* methods,
1816 const Symbol* name,
1817 const Symbol* signature,
1818 OverpassLookupMode overpass_mode,
1819 StaticLookupMode static_mode,
1820 PrivateLookupMode private_mode) {
1821 int hit = find_method_index(methods, name, signature, overpass_mode, static_mode, private_mode);
1822 return hit >= 0 ? methods->at(hit): NULL;
1823 }
1824
1825 // true if method matches signature and conforms to skipping_X conditions.
1826 static bool method_matches(const Method* m,
1827 const Symbol* signature,
1828 bool skipping_overpass,
1829 bool skipping_static,
1830 bool skipping_private) {
1831 return ((m->signature() == signature) &&
1832 (!skipping_overpass || !m->is_overpass()) &&
1833 (!skipping_static || !m->is_static()) &&
1834 (!skipping_private || !m->is_private()));
1835 }
1836
1837 // Used directly for default_methods to find the index into the
1838 // default_vtable_indices, and indirectly by find_method
1839 // find_method_index looks in the local methods array to return the index
1840 // of the matching name/signature. If, overpass methods are being ignored,
1841 // the search continues to find a potential non-overpass match. This capability
1842 // is important during method resolution to prefer a static method, for example,
1843 // over an overpass method.
1844 // There is the possibility in any _method's array to have the same name/signature
1845 // for a static method, an overpass method and a local instance method
1846 // To correctly catch a given method, the search criteria may need
1847 // to explicitly skip the other two. For local instance methods, it
1848 // is often necessary to skip private methods
1849 int InstanceKlass::find_method_index(const Array<Method*>* methods,
1850 const Symbol* name,
1851 const Symbol* signature,
1852 OverpassLookupMode overpass_mode,
1853 StaticLookupMode static_mode,
1854 PrivateLookupMode private_mode) {
1855 const bool skipping_overpass = (overpass_mode == skip_overpass);
1856 const bool skipping_static = (static_mode == skip_static);
1857 const bool skipping_private = (private_mode == skip_private);
1858 const int hit = binary_search(methods, name);
1859 if (hit != -1) {
1860 const Method* const m = methods->at(hit);
1861
1862 // Do linear search to find matching signature. First, quick check
1863 // for common case, ignoring overpasses if requested.
1864 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1865 return hit;
1866 }
1867
1868 // search downwards through overloaded methods
1869 int i;
1870 for (i = hit - 1; i >= 0; --i) {
1871 const Method* const m = methods->at(i);
1872 assert(m->is_method(), "must be method");
1873 if (m->name() != name) {
1874 break;
1875 }
1876 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1877 return i;
1878 }
1879 }
1880 // search upwards
1881 for (i = hit + 1; i < methods->length(); ++i) {
1882 const Method* const m = methods->at(i);
1883 assert(m->is_method(), "must be method");
1884 if (m->name() != name) {
1885 break;
1886 }
1887 if (method_matches(m, signature, skipping_overpass, skipping_static, skipping_private)) {
1888 return i;
1889 }
1890 }
1891 // not found
1892 #ifdef ASSERT
1893 const int index = (skipping_overpass || skipping_static || skipping_private) ? -1 :
1894 linear_search(methods, name, signature);
1895 assert(-1 == index, "binary search should have found entry %d", index);
1896 #endif
1897 }
1898 return -1;
1899 }
1900
1901 int InstanceKlass::find_method_by_name(const Symbol* name, int* end) const {
1902 return find_method_by_name(methods(), name, end);
1903 }
1904
1905 int InstanceKlass::find_method_by_name(const Array<Method*>* methods,
1906 const Symbol* name,
1907 int* end_ptr) {
1908 assert(end_ptr != NULL, "just checking");
1909 int start = binary_search(methods, name);
1910 int end = start + 1;
1911 if (start != -1) {
1912 while (start - 1 >= 0 && (methods->at(start - 1))->name() == name) --start;
1913 while (end < methods->length() && (methods->at(end))->name() == name) ++end;
1914 *end_ptr = end;
1915 return start;
1916 }
1917 return -1;
1918 }
1919
1920 // uncached_lookup_method searches both the local class methods array and all
1921 // superclasses methods arrays, skipping any overpass methods in superclasses,
1922 // and possibly skipping private methods.
1923 Method* InstanceKlass::uncached_lookup_method(const Symbol* name,
1924 const Symbol* signature,
1925 OverpassLookupMode overpass_mode,
1926 PrivateLookupMode private_mode) const {
1927 OverpassLookupMode overpass_local_mode = overpass_mode;
1928 const Klass* klass = this;
1929 while (klass != NULL) {
1930 Method* const method = InstanceKlass::cast(klass)->find_method_impl(name,
1931 signature,
1932 overpass_local_mode,
1933 find_static,
1934 private_mode);
1935 if (method != NULL) {
1936 return method;
1937 }
1938 if (name == vmSymbols::object_initializer_name()) {
1939 break; // <init> is never inherited, not even as a static factory
1940 }
1941 klass = klass->super();
1942 overpass_local_mode = skip_overpass; // Always ignore overpass methods in superclasses
1943 }
1944 return NULL;
1945 }
1946
1947 #ifdef ASSERT
1948 // search through class hierarchy and return true if this class or
1949 // one of the superclasses was redefined
1950 bool InstanceKlass::has_redefined_this_or_super() const {
1951 const Klass* klass = this;
1952 while (klass != NULL) {
1953 if (InstanceKlass::cast(klass)->has_been_redefined()) {
1954 return true;
1955 }
1956 klass = klass->super();
1957 }
1958 return false;
1959 }
1960 #endif
1961
1962 // lookup a method in the default methods list then in all transitive interfaces
1963 // Do NOT return private or static methods
1964 Method* InstanceKlass::lookup_method_in_ordered_interfaces(Symbol* name,
1965 Symbol* signature) const {
1966 Method* m = NULL;
1967 if (default_methods() != NULL) {
1968 m = find_method(default_methods(), name, signature);
1969 }
1970 // Look up interfaces
1971 if (m == NULL) {
1972 m = lookup_method_in_all_interfaces(name, signature, find_defaults);
1973 }
1974 return m;
1975 }
1976
1977 // lookup a method in all the interfaces that this class implements
1978 // Do NOT return private or static methods, new in JDK8 which are not externally visible
1979 // They should only be found in the initial InterfaceMethodRef
1980 Method* InstanceKlass::lookup_method_in_all_interfaces(Symbol* name,
1981 Symbol* signature,
1982 DefaultsLookupMode defaults_mode) const {
1983 Array<InstanceKlass*>* all_ifs = transitive_interfaces();
1984 int num_ifs = all_ifs->length();
1985 InstanceKlass *ik = NULL;
1986 for (int i = 0; i < num_ifs; i++) {
1987 ik = all_ifs->at(i);
1988 Method* m = ik->lookup_method(name, signature);
1989 if (m != NULL && m->is_public() && !m->is_static() &&
1990 ((defaults_mode != skip_defaults) || !m->is_default_method())) {
1991 return m;
1992 }
1993 }
1994 return NULL;
1995 }
1996
1997 /* jni_id_for_impl for jfieldIds only */
1998 JNIid* InstanceKlass::jni_id_for_impl(int offset) {
1999 MutexLocker ml(JfieldIdCreation_lock);
2000 // Retry lookup after we got the lock
2001 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
2002 if (probe == NULL) {
2003 // Slow case, allocate new static field identifier
2004 probe = new JNIid(this, offset, jni_ids());
2005 set_jni_ids(probe);
2006 }
2007 return probe;
2008 }
2009
2010
2011 /* jni_id_for for jfieldIds only */
2012 JNIid* InstanceKlass::jni_id_for(int offset) {
2013 JNIid* probe = jni_ids() == NULL ? NULL : jni_ids()->find(offset);
2014 if (probe == NULL) {
2015 probe = jni_id_for_impl(offset);
2016 }
2017 return probe;
2018 }
2019
2020 u2 InstanceKlass::enclosing_method_data(int offset) const {
2021 const Array<jushort>* const inner_class_list = inner_classes();
2022 if (inner_class_list == NULL) {
2023 return 0;
2024 }
2025 const int length = inner_class_list->length();
2026 if (length % inner_class_next_offset == 0) {
2027 return 0;
2028 }
2029 const int index = length - enclosing_method_attribute_size;
2030 assert(offset < enclosing_method_attribute_size, "invalid offset");
2031 return inner_class_list->at(index + offset);
2032 }
2033
2034 void InstanceKlass::set_enclosing_method_indices(u2 class_index,
2035 u2 method_index) {
2036 Array<jushort>* inner_class_list = inner_classes();
2037 assert (inner_class_list != NULL, "_inner_classes list is not set up");
2038 int length = inner_class_list->length();
2039 if (length % inner_class_next_offset == enclosing_method_attribute_size) {
2040 int index = length - enclosing_method_attribute_size;
2041 inner_class_list->at_put(
2042 index + enclosing_method_class_index_offset, class_index);
2043 inner_class_list->at_put(
2044 index + enclosing_method_method_index_offset, method_index);
2045 }
2046 }
2047
2048 // Lookup or create a jmethodID.
2049 // This code is called by the VMThread and JavaThreads so the
2050 // locking has to be done very carefully to avoid deadlocks
2051 // and/or other cache consistency problems.
2052 //
2053 jmethodID InstanceKlass::get_jmethod_id(const methodHandle& method_h) {
2054 size_t idnum = (size_t)method_h->method_idnum();
2055 jmethodID* jmeths = methods_jmethod_ids_acquire();
2056 size_t length = 0;
2057 jmethodID id = NULL;
2058
2059 // We use a double-check locking idiom here because this cache is
2060 // performance sensitive. In the normal system, this cache only
2061 // transitions from NULL to non-NULL which is safe because we use
2062 // release_set_methods_jmethod_ids() to advertise the new cache.
2063 // A partially constructed cache should never be seen by a racing
2064 // thread. We also use release_store() to save a new jmethodID
2065 // in the cache so a partially constructed jmethodID should never be
2066 // seen either. Cache reads of existing jmethodIDs proceed without a
2067 // lock, but cache writes of a new jmethodID requires uniqueness and
2068 // creation of the cache itself requires no leaks so a lock is
2069 // generally acquired in those two cases.
2070 //
2071 // If the RedefineClasses() API has been used, then this cache can
2072 // grow and we'll have transitions from non-NULL to bigger non-NULL.
2073 // Cache creation requires no leaks and we require safety between all
2074 // cache accesses and freeing of the old cache so a lock is generally
2075 // acquired when the RedefineClasses() API has been used.
2076
2077 if (jmeths != NULL) {
2078 // the cache already exists
2079 if (!idnum_can_increment()) {
2080 // the cache can't grow so we can just get the current values
2081 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2082 } else {
2083 // cache can grow so we have to be more careful
2084 if (Threads::number_of_threads() == 0 ||
2085 SafepointSynchronize::is_at_safepoint()) {
2086 // we're single threaded or at a safepoint - no locking needed
2087 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2088 } else {
2089 MutexLocker ml(JmethodIdCreation_lock);
2090 get_jmethod_id_length_value(jmeths, idnum, &length, &id);
2091 }
2092 }
2093 }
2094 // implied else:
2095 // we need to allocate a cache so default length and id values are good
2096
2097 if (jmeths == NULL || // no cache yet
2098 length <= idnum || // cache is too short
2099 id == NULL) { // cache doesn't contain entry
2100
2101 // This function can be called by the VMThread so we have to do all
2102 // things that might block on a safepoint before grabbing the lock.
2103 // Otherwise, we can deadlock with the VMThread or have a cache
2104 // consistency issue. These vars keep track of what we might have
2105 // to free after the lock is dropped.
2106 jmethodID to_dealloc_id = NULL;
2107 jmethodID* to_dealloc_jmeths = NULL;
2108
2109 // may not allocate new_jmeths or use it if we allocate it
2110 jmethodID* new_jmeths = NULL;
2111 if (length <= idnum) {
2112 // allocate a new cache that might be used
2113 size_t size = MAX2(idnum+1, (size_t)idnum_allocated_count());
2114 new_jmeths = NEW_C_HEAP_ARRAY(jmethodID, size+1, mtClass);
2115 memset(new_jmeths, 0, (size+1)*sizeof(jmethodID));
2116 // cache size is stored in element[0], other elements offset by one
2117 new_jmeths[0] = (jmethodID)size;
2118 }
2119
2120 // allocate a new jmethodID that might be used
2121 jmethodID new_id = NULL;
2122 if (method_h->is_old() && !method_h->is_obsolete()) {
2123 // The method passed in is old (but not obsolete), we need to use the current version
2124 Method* current_method = method_with_idnum((int)idnum);
2125 assert(current_method != NULL, "old and but not obsolete, so should exist");
2126 new_id = Method::make_jmethod_id(class_loader_data(), current_method);
2127 } else {
2128 // It is the current version of the method or an obsolete method,
2129 // use the version passed in
2130 new_id = Method::make_jmethod_id(class_loader_data(), method_h());
2131 }
2132
2133 if (Threads::number_of_threads() == 0 ||
2134 SafepointSynchronize::is_at_safepoint()) {
2135 // we're single threaded or at a safepoint - no locking needed
2136 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2137 &to_dealloc_id, &to_dealloc_jmeths);
2138 } else {
2139 MutexLocker ml(JmethodIdCreation_lock);
2140 id = get_jmethod_id_fetch_or_update(idnum, new_id, new_jmeths,
2141 &to_dealloc_id, &to_dealloc_jmeths);
2142 }
2143
2144 // The lock has been dropped so we can free resources.
2145 // Free up either the old cache or the new cache if we allocated one.
2146 if (to_dealloc_jmeths != NULL) {
2147 FreeHeap(to_dealloc_jmeths);
2148 }
2149 // free up the new ID since it wasn't needed
2150 if (to_dealloc_id != NULL) {
2151 Method::destroy_jmethod_id(class_loader_data(), to_dealloc_id);
2152 }
2153 }
2154 return id;
2155 }
2156
2157 // Figure out how many jmethodIDs haven't been allocated, and make
2158 // sure space for them is pre-allocated. This makes getting all
2159 // method ids much, much faster with classes with more than 8
2160 // methods, and has a *substantial* effect on performance with jvmti
2161 // code that loads all jmethodIDs for all classes.
2162 void InstanceKlass::ensure_space_for_methodids(int start_offset) {
2163 int new_jmeths = 0;
2164 int length = methods()->length();
2165 for (int index = start_offset; index < length; index++) {
2166 Method* m = methods()->at(index);
2167 jmethodID id = m->find_jmethod_id_or_null();
2168 if (id == NULL) {
2169 new_jmeths++;
2170 }
2171 }
2172 if (new_jmeths != 0) {
2173 Method::ensure_jmethod_ids(class_loader_data(), new_jmeths);
2174 }
2175 }
2176
2177 // Common code to fetch the jmethodID from the cache or update the
2178 // cache with the new jmethodID. This function should never do anything
2179 // that causes the caller to go to a safepoint or we can deadlock with
2180 // the VMThread or have cache consistency issues.
2181 //
2182 jmethodID InstanceKlass::get_jmethod_id_fetch_or_update(
2183 size_t idnum, jmethodID new_id,
2184 jmethodID* new_jmeths, jmethodID* to_dealloc_id_p,
2185 jmethodID** to_dealloc_jmeths_p) {
2186 assert(new_id != NULL, "sanity check");
2187 assert(to_dealloc_id_p != NULL, "sanity check");
2188 assert(to_dealloc_jmeths_p != NULL, "sanity check");
2189 assert(Threads::number_of_threads() == 0 ||
2190 SafepointSynchronize::is_at_safepoint() ||
2191 JmethodIdCreation_lock->owned_by_self(), "sanity check");
2192
2193 // reacquire the cache - we are locked, single threaded or at a safepoint
2194 jmethodID* jmeths = methods_jmethod_ids_acquire();
2195 jmethodID id = NULL;
2196 size_t length = 0;
2197
2198 if (jmeths == NULL || // no cache yet
2199 (length = (size_t)jmeths[0]) <= idnum) { // cache is too short
2200 if (jmeths != NULL) {
2201 // copy any existing entries from the old cache
2202 for (size_t index = 0; index < length; index++) {
2203 new_jmeths[index+1] = jmeths[index+1];
2204 }
2205 *to_dealloc_jmeths_p = jmeths; // save old cache for later delete
2206 }
2207 release_set_methods_jmethod_ids(jmeths = new_jmeths);
2208 } else {
2209 // fetch jmethodID (if any) from the existing cache
2210 id = jmeths[idnum+1];
2211 *to_dealloc_jmeths_p = new_jmeths; // save new cache for later delete
2212 }
2213 if (id == NULL) {
2214 // No matching jmethodID in the existing cache or we have a new
2215 // cache or we just grew the cache. This cache write is done here
2216 // by the first thread to win the foot race because a jmethodID
2217 // needs to be unique once it is generally available.
2218 id = new_id;
2219
2220 // The jmethodID cache can be read while unlocked so we have to
2221 // make sure the new jmethodID is complete before installing it
2222 // in the cache.
2223 OrderAccess::release_store(&jmeths[idnum+1], id);
2224 } else {
2225 *to_dealloc_id_p = new_id; // save new id for later delete
2226 }
2227 return id;
2228 }
2229
2230
2231 // Common code to get the jmethodID cache length and the jmethodID
2232 // value at index idnum if there is one.
2233 //
2234 void InstanceKlass::get_jmethod_id_length_value(jmethodID* cache,
2235 size_t idnum, size_t *length_p, jmethodID* id_p) {
2236 assert(cache != NULL, "sanity check");
2237 assert(length_p != NULL, "sanity check");
2238 assert(id_p != NULL, "sanity check");
2239
2240 // cache size is stored in element[0], other elements offset by one
2241 *length_p = (size_t)cache[0];
2242 if (*length_p <= idnum) { // cache is too short
2243 *id_p = NULL;
2244 } else {
2245 *id_p = cache[idnum+1]; // fetch jmethodID (if any)
2246 }
2247 }
2248
2249
2250 // Lookup a jmethodID, NULL if not found. Do no blocking, no allocations, no handles
2251 jmethodID InstanceKlass::jmethod_id_or_null(Method* method) {
2252 size_t idnum = (size_t)method->method_idnum();
2253 jmethodID* jmeths = methods_jmethod_ids_acquire();
2254 size_t length; // length assigned as debugging crumb
2255 jmethodID id = NULL;
2256 if (jmeths != NULL && // If there is a cache
2257 (length = (size_t)jmeths[0]) > idnum) { // and if it is long enough,
2258 id = jmeths[idnum+1]; // Look up the id (may be NULL)
2259 }
2260 return id;
2261 }
2262
2263 inline DependencyContext InstanceKlass::dependencies() {
2264 DependencyContext dep_context(&_dep_context, &_dep_context_last_cleaned);
2265 return dep_context;
2266 }
2267
2268 int InstanceKlass::mark_dependent_nmethods(KlassDepChange& changes) {
2269 return dependencies().mark_dependent_nmethods(changes);
2270 }
2271
2272 void InstanceKlass::add_dependent_nmethod(nmethod* nm) {
2273 dependencies().add_dependent_nmethod(nm);
2274 }
2275
2276 void InstanceKlass::remove_dependent_nmethod(nmethod* nm) {
2277 dependencies().remove_dependent_nmethod(nm);
2278 }
2279
2280 void InstanceKlass::clean_dependency_context() {
2281 dependencies().clean_unloading_dependents();
2282 }
2283
2284 #ifndef PRODUCT
2285 void InstanceKlass::print_dependent_nmethods(bool verbose) {
2286 dependencies().print_dependent_nmethods(verbose);
2287 }
2288
2289 bool InstanceKlass::is_dependent_nmethod(nmethod* nm) {
2290 return dependencies().is_dependent_nmethod(nm);
2291 }
2292 #endif //PRODUCT
2293
2294 void InstanceKlass::clean_weak_instanceklass_links() {
2295 clean_implementors_list();
2296 clean_method_data();
2297 }
2298
2299 void InstanceKlass::clean_implementors_list() {
2300 assert(is_loader_alive(), "this klass should be live");
2301 if (is_interface()) {
2302 assert (ClassUnloading, "only called for ClassUnloading");
2303 for (;;) {
2304 // Use load_acquire due to competing with inserts
2305 Klass* impl = OrderAccess::load_acquire(adr_implementor());
2306 if (impl != NULL && !impl->is_loader_alive()) {
2307 // NULL this field, might be an unloaded klass or NULL
2308 Klass* volatile* klass = adr_implementor();
2309 if (Atomic::cmpxchg((Klass*)NULL, klass, impl) == impl) {
2310 // Successfully unlinking implementor.
2311 if (log_is_enabled(Trace, class, unload)) {
2312 ResourceMark rm;
2313 log_trace(class, unload)("unlinking class (implementor): %s", impl->external_name());
2314 }
2315 return;
2316 }
2317 } else {
2318 return;
2319 }
2320 }
2321 }
2322 }
2323
2324 void InstanceKlass::clean_method_data() {
2325 for (int m = 0; m < methods()->length(); m++) {
2326 MethodData* mdo = methods()->at(m)->method_data();
2327 if (mdo != NULL) {
2328 MutexLocker ml(SafepointSynchronize::is_at_safepoint() ? NULL : mdo->extra_data_lock());
2329 mdo->clean_method_data(/*always_clean*/false);
2330 }
2331 }
2332 }
2333
2334 bool InstanceKlass::supers_have_passed_fingerprint_checks() {
2335 if (java_super() != NULL && !java_super()->has_passed_fingerprint_check()) {
2336 ResourceMark rm;
2337 log_trace(class, fingerprint)("%s : super %s not fingerprinted", external_name(), java_super()->external_name());
2338 return false;
2339 }
2340
2341 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
2342 if (local_interfaces != NULL) {
2343 int length = local_interfaces->length();
2344 for (int i = 0; i < length; i++) {
2345 InstanceKlass* intf = local_interfaces->at(i);
2346 if (!intf->has_passed_fingerprint_check()) {
2347 ResourceMark rm;
2348 log_trace(class, fingerprint)("%s : interface %s not fingerprinted", external_name(), intf->external_name());
2349 return false;
2350 }
2351 }
2352 }
2353
2354 return true;
2355 }
2356
2357 bool InstanceKlass::should_store_fingerprint(bool is_unsafe_anonymous) {
2358 #if INCLUDE_AOT
2359 // We store the fingerprint into the InstanceKlass only in the following 2 cases:
2360 if (CalculateClassFingerprint) {
2361 // (1) We are running AOT to generate a shared library.
2362 return true;
2363 }
2364 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
2365 // (2) We are running -Xshare:dump or -XX:ArchiveClassesAtExit to create a shared archive
2366 return true;
2367 }
2368 if (UseAOT && is_unsafe_anonymous) {
2369 // (3) We are using AOT code from a shared library and see an unsafe anonymous class
2370 return true;
2371 }
2372 #endif
2373
2374 // In all other cases we might set the _misc_has_passed_fingerprint_check bit,
2375 // but do not store the 64-bit fingerprint to save space.
2376 return false;
2377 }
2378
2379 bool InstanceKlass::has_stored_fingerprint() const {
2380 #if INCLUDE_AOT
2381 return should_store_fingerprint() || is_shared();
2382 #else
2383 return false;
2384 #endif
2385 }
2386
2387 uint64_t InstanceKlass::get_stored_fingerprint() const {
2388 address adr = adr_fingerprint();
2389 if (adr != NULL) {
2390 return (uint64_t)Bytes::get_native_u8(adr); // adr may not be 64-bit aligned
2391 }
2392 return 0;
2393 }
2394
2395 void InstanceKlass::store_fingerprint(uint64_t fingerprint) {
2396 address adr = adr_fingerprint();
2397 if (adr != NULL) {
2398 Bytes::put_native_u8(adr, (u8)fingerprint); // adr may not be 64-bit aligned
2399
2400 ResourceMark rm;
2401 log_trace(class, fingerprint)("stored as " PTR64_FORMAT " for class %s", fingerprint, external_name());
2402 }
2403 }
2404
2405 void InstanceKlass::metaspace_pointers_do(MetaspaceClosure* it) {
2406 Klass::metaspace_pointers_do(it);
2407
2408 if (log_is_enabled(Trace, cds)) {
2409 ResourceMark rm;
2410 log_trace(cds)("Iter(InstanceKlass): %p (%s)", this, external_name());
2411 }
2412
2413 it->push(&_annotations);
2414 it->push((Klass**)&_array_klasses);
2415 it->push(&_constants);
2416 it->push(&_inner_classes);
2417 it->push(&_array_name);
2418 #if INCLUDE_JVMTI
2419 it->push(&_previous_versions);
2420 #endif
2421 it->push(&_methods);
2422 it->push(&_default_methods);
2423 it->push(&_local_interfaces);
2424 it->push(&_transitive_interfaces);
2425 it->push(&_method_ordering);
2426 it->push(&_default_vtable_indices);
2427 it->push(&_fields);
2428
2429 if (itable_length() > 0) {
2430 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
2431 int method_table_offset_in_words = ioe->offset()/wordSize;
2432 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
2433 / itableOffsetEntry::size();
2434
2435 for (int i = 0; i < nof_interfaces; i ++, ioe ++) {
2436 if (ioe->interface_klass() != NULL) {
2437 it->push(ioe->interface_klass_addr());
2438 itableMethodEntry* ime = ioe->first_method_entry(this);
2439 int n = klassItable::method_count_for_interface(ioe->interface_klass());
2440 for (int index = 0; index < n; index ++) {
2441 it->push(ime[index].method_addr());
2442 }
2443 }
2444 }
2445 }
2446
2447 it->push(&_nest_members);
2448 }
2449
2450 void InstanceKlass::remove_unshareable_info() {
2451 Klass::remove_unshareable_info();
2452
2453 if (is_in_error_state()) {
2454 // Classes are attempted to link during dumping and may fail,
2455 // but these classes are still in the dictionary and class list in CLD.
2456 // Check in_error state first because in_error is > linked state, so
2457 // is_linked() is true.
2458 // If there's a linking error, there is nothing else to remove.
2459 return;
2460 }
2461
2462 // Reset to the 'allocated' state to prevent any premature accessing to
2463 // a shared class at runtime while the class is still being loaded and
2464 // restored. A class' init_state is set to 'loaded' at runtime when it's
2465 // being added to class hierarchy (see SystemDictionary:::add_to_hierarchy()).
2466 _init_state = allocated;
2467
2468 {
2469 MutexLocker ml(Compile_lock);
2470 init_implementor();
2471 }
2472
2473 constants()->remove_unshareable_info();
2474
2475 for (int i = 0; i < methods()->length(); i++) {
2476 Method* m = methods()->at(i);
2477 m->remove_unshareable_info();
2478 }
2479
2480 // do array classes also.
2481 if (array_klasses() != NULL) {
2482 array_klasses()->remove_unshareable_info();
2483 }
2484
2485 // These are not allocated from metaspace. They are safe to set to NULL.
2486 _source_debug_extension = NULL;
2487 _dep_context = NULL;
2488 _osr_nmethods_head = NULL;
2489 #if INCLUDE_JVMTI
2490 _breakpoints = NULL;
2491 _previous_versions = NULL;
2492 _cached_class_file = NULL;
2493 #endif
2494
2495 _init_thread = NULL;
2496 _methods_jmethod_ids = NULL;
2497 _jni_ids = NULL;
2498 _oop_map_cache = NULL;
2499 // clear _nest_host to ensure re-load at runtime
2500 _nest_host = NULL;
2501 }
2502
2503 void InstanceKlass::remove_java_mirror() {
2504 Klass::remove_java_mirror();
2505
2506 // do array classes also.
2507 if (array_klasses() != NULL) {
2508 array_klasses()->remove_java_mirror();
2509 }
2510 }
2511
2512 void InstanceKlass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) {
2513 // SystemDictionary::add_to_hierarchy() sets the init_state to loaded
2514 // before the InstanceKlass is added to the SystemDictionary. Make
2515 // sure the current state is <loaded.
2516 assert(!is_loaded(), "invalid init state");
2517 set_package(loader_data, CHECK);
2518 Klass::restore_unshareable_info(loader_data, protection_domain, CHECK);
2519
2520 Array<Method*>* methods = this->methods();
2521 int num_methods = methods->length();
2522 for (int index = 0; index < num_methods; ++index) {
2523 methods->at(index)->restore_unshareable_info(CHECK);
2524 }
2525 if (JvmtiExport::has_redefined_a_class()) {
2526 // Reinitialize vtable because RedefineClasses may have changed some
2527 // entries in this vtable for super classes so the CDS vtable might
2528 // point to old or obsolete entries. RedefineClasses doesn't fix up
2529 // vtables in the shared system dictionary, only the main one.
2530 // It also redefines the itable too so fix that too.
2531 vtable().initialize_vtable(false, CHECK);
2532 itable().initialize_itable(false, CHECK);
2533 }
2534
2535 // restore constant pool resolved references
2536 constants()->restore_unshareable_info(CHECK);
2537
2538 if (array_klasses() != NULL) {
2539 // Array classes have null protection domain.
2540 // --> see ArrayKlass::complete_create_array_klass()
2541 array_klasses()->restore_unshareable_info(ClassLoaderData::the_null_class_loader_data(), Handle(), CHECK);
2542 }
2543 }
2544
2545 // returns true IFF is_in_error_state() has been changed as a result of this call.
2546 bool InstanceKlass::check_sharing_error_state() {
2547 assert(DumpSharedSpaces, "should only be called during dumping");
2548 bool old_state = is_in_error_state();
2549
2550 if (!is_in_error_state()) {
2551 bool bad = false;
2552 for (InstanceKlass* sup = java_super(); sup; sup = sup->java_super()) {
2553 if (sup->is_in_error_state()) {
2554 bad = true;
2555 break;
2556 }
2557 }
2558 if (!bad) {
2559 Array<InstanceKlass*>* interfaces = transitive_interfaces();
2560 for (int i = 0; i < interfaces->length(); i++) {
2561 InstanceKlass* iface = interfaces->at(i);
2562 if (iface->is_in_error_state()) {
2563 bad = true;
2564 break;
2565 }
2566 }
2567 }
2568
2569 if (bad) {
2570 set_in_error_state();
2571 }
2572 }
2573
2574 return (old_state != is_in_error_state());
2575 }
2576
2577 void InstanceKlass::set_class_loader_type(s2 loader_type) {
2578 switch (loader_type) {
2579 case ClassLoader::BOOT_LOADER:
2580 _misc_flags |= _misc_is_shared_boot_class;
2581 break;
2582 case ClassLoader::PLATFORM_LOADER:
2583 _misc_flags |= _misc_is_shared_platform_class;
2584 break;
2585 case ClassLoader::APP_LOADER:
2586 _misc_flags |= _misc_is_shared_app_class;
2587 break;
2588 default:
2589 ShouldNotReachHere();
2590 break;
2591 }
2592 }
2593
2594 #if INCLUDE_JVMTI
2595 static void clear_all_breakpoints(Method* m) {
2596 m->clear_all_breakpoints();
2597 }
2598 #endif
2599
2600 void InstanceKlass::unload_class(InstanceKlass* ik) {
2601 // Release dependencies.
2602 ik->dependencies().remove_all_dependents();
2603
2604 // notify the debugger
2605 if (JvmtiExport::should_post_class_unload()) {
2606 JvmtiExport::post_class_unload(ik);
2607 }
2608
2609 // notify ClassLoadingService of class unload
2610 ClassLoadingService::notify_class_unloaded(ik);
2611
2612 if (DumpSharedSpaces || DynamicDumpSharedSpaces) {
2613 SystemDictionaryShared::remove_dumptime_info(ik);
2614 }
2615
2616 if (log_is_enabled(Info, class, unload)) {
2617 ResourceMark rm;
2618 log_info(class, unload)("unloading class %s " INTPTR_FORMAT, ik->external_name(), p2i(ik));
2619 }
2620
2621 Events::log_class_unloading(Thread::current(), ik);
2622
2623 #if INCLUDE_JFR
2624 assert(ik != NULL, "invariant");
2625 EventClassUnload event;
2626 event.set_unloadedClass(ik);
2627 event.set_definingClassLoader(ik->class_loader_data());
2628 event.commit();
2629 #endif
2630 }
2631
2632 void InstanceKlass::release_C_heap_structures(InstanceKlass* ik) {
2633 // Clean up C heap
2634 ik->release_C_heap_structures();
2635 ik->constants()->release_C_heap_structures();
2636 }
2637
2638 void InstanceKlass::release_C_heap_structures() {
2639 // Can't release the constant pool here because the constant pool can be
2640 // deallocated separately from the InstanceKlass for default methods and
2641 // redefine classes.
2642
2643 // Deallocate oop map cache
2644 if (_oop_map_cache != NULL) {
2645 delete _oop_map_cache;
2646 _oop_map_cache = NULL;
2647 }
2648
2649 // Deallocate JNI identifiers for jfieldIDs
2650 JNIid::deallocate(jni_ids());
2651 set_jni_ids(NULL);
2652
2653 jmethodID* jmeths = methods_jmethod_ids_acquire();
2654 if (jmeths != (jmethodID*)NULL) {
2655 release_set_methods_jmethod_ids(NULL);
2656 FreeHeap(jmeths);
2657 }
2658
2659 assert(_dep_context == NULL,
2660 "dependencies should already be cleaned");
2661
2662 #if INCLUDE_JVMTI
2663 // Deallocate breakpoint records
2664 if (breakpoints() != 0x0) {
2665 methods_do(clear_all_breakpoints);
2666 assert(breakpoints() == 0x0, "should have cleared breakpoints");
2667 }
2668
2669 // deallocate the cached class file
2670 if (_cached_class_file != NULL) {
2671 os::free(_cached_class_file);
2672 _cached_class_file = NULL;
2673 }
2674 #endif
2675
2676 // Decrement symbol reference counts associated with the unloaded class.
2677 if (_name != NULL) _name->decrement_refcount();
2678 // unreference array name derived from this class name (arrays of an unloaded
2679 // class can't be referenced anymore).
2680 if (_array_name != NULL) _array_name->decrement_refcount();
2681 if (_value_types != NULL) {
2682 for (int i = 0; i < _value_types->length(); i++) {
2683 Symbol* s = _value_types->at(i)._class_name;
2684 if (s != NULL) {
2685 s->decrement_refcount();
2686 }
2687 }
2688 }
2689 if (_source_debug_extension != NULL) FREE_C_HEAP_ARRAY(char, _source_debug_extension);
2690 }
2691
2692 void InstanceKlass::set_source_debug_extension(const char* array, int length) {
2693 if (array == NULL) {
2694 _source_debug_extension = NULL;
2695 } else {
2696 // Adding one to the attribute length in order to store a null terminator
2697 // character could cause an overflow because the attribute length is
2698 // already coded with an u4 in the classfile, but in practice, it's
2699 // unlikely to happen.
2700 assert((length+1) > length, "Overflow checking");
2701 char* sde = NEW_C_HEAP_ARRAY(char, (length + 1), mtClass);
2702 for (int i = 0; i < length; i++) {
2703 sde[i] = array[i];
2704 }
2705 sde[length] = '\0';
2706 _source_debug_extension = sde;
2707 }
2708 }
2709
2710 const char* InstanceKlass::signature_name() const {
2711 return signature_name_of(is_value() ? 'Q' : 'L');
2712 }
2713
2714 const char* InstanceKlass::signature_name_of(char c) const {
2715 int hash_len = 0;
2716 char hash_buf[40];
2717
2718 // If this is an unsafe anonymous class, append a hash to make the name unique
2719 if (is_unsafe_anonymous()) {
2720 intptr_t hash = (java_mirror() != NULL) ? java_mirror()->identity_hash() : 0;
2721 jio_snprintf(hash_buf, sizeof(hash_buf), "/" UINTX_FORMAT, (uintx)hash);
2722 hash_len = (int)strlen(hash_buf);
2723 }
2724
2725 // Get the internal name as a c string
2726 const char* src = (const char*) (name()->as_C_string());
2727 const int src_length = (int)strlen(src);
2728
2729 char* dest = NEW_RESOURCE_ARRAY(char, src_length + hash_len + 3);
2730
2731 // Add L or Q as type indicator
2732 int dest_index = 0;
2733 dest[dest_index++] = c;
2734
2735 // Add the actual class name
2736 for (int src_index = 0; src_index < src_length; ) {
2737 dest[dest_index++] = src[src_index++];
2738 }
2739
2740 // If we have a hash, append it
2741 for (int hash_index = 0; hash_index < hash_len; ) {
2742 dest[dest_index++] = hash_buf[hash_index++];
2743 }
2744
2745 // Add the semicolon and the NULL
2746 dest[dest_index++] = ';';
2747 dest[dest_index] = '\0';
2748 return dest;
2749 }
2750
2751 // Used to obtain the package name from a fully qualified class name.
2752 Symbol* InstanceKlass::package_from_name(const Symbol* name, TRAPS) {
2753 if (name == NULL) {
2754 return NULL;
2755 } else {
2756 if (name->utf8_length() <= 0) {
2757 return NULL;
2758 }
2759 ResourceMark rm;
2760 const char* package_name = ClassLoader::package_from_name((const char*) name->as_C_string());
2761 if (package_name == NULL) {
2762 return NULL;
2763 }
2764 Symbol* pkg_name = SymbolTable::new_symbol(package_name);
2765 return pkg_name;
2766 }
2767 }
2768
2769 ModuleEntry* InstanceKlass::module() const {
2770 // For an unsafe anonymous class return the host class' module
2771 if (is_unsafe_anonymous()) {
2772 assert(unsafe_anonymous_host() != NULL, "unsafe anonymous class must have a host class");
2773 return unsafe_anonymous_host()->module();
2774 }
2775
2776 // Class is in a named package
2777 if (!in_unnamed_package()) {
2778 return _package_entry->module();
2779 }
2780
2781 // Class is in an unnamed package, return its loader's unnamed module
2782 return class_loader_data()->unnamed_module();
2783 }
2784
2785 void InstanceKlass::set_package(ClassLoaderData* loader_data, TRAPS) {
2786
2787 // ensure java/ packages only loaded by boot or platform builtin loaders
2788 check_prohibited_package(name(), loader_data, CHECK);
2789
2790 TempNewSymbol pkg_name = package_from_name(name(), CHECK);
2791
2792 if (pkg_name != NULL && loader_data != NULL) {
2793
2794 // Find in class loader's package entry table.
2795 _package_entry = loader_data->packages()->lookup_only(pkg_name);
2796
2797 // If the package name is not found in the loader's package
2798 // entry table, it is an indication that the package has not
2799 // been defined. Consider it defined within the unnamed module.
2800 if (_package_entry == NULL) {
2801 ResourceMark rm;
2802
2803 if (!ModuleEntryTable::javabase_defined()) {
2804 // Before java.base is defined during bootstrapping, define all packages in
2805 // the java.base module. If a non-java.base package is erroneously placed
2806 // in the java.base module it will be caught later when java.base
2807 // is defined by ModuleEntryTable::verify_javabase_packages check.
2808 assert(ModuleEntryTable::javabase_moduleEntry() != NULL, JAVA_BASE_NAME " module is NULL");
2809 _package_entry = loader_data->packages()->lookup(pkg_name, ModuleEntryTable::javabase_moduleEntry());
2810 } else {
2811 assert(loader_data->unnamed_module() != NULL, "unnamed module is NULL");
2812 _package_entry = loader_data->packages()->lookup(pkg_name,
2813 loader_data->unnamed_module());
2814 }
2815
2816 // A package should have been successfully created
2817 assert(_package_entry != NULL, "Package entry for class %s not found, loader %s",
2818 name()->as_C_string(), loader_data->loader_name_and_id());
2819 }
2820
2821 if (log_is_enabled(Debug, module)) {
2822 ResourceMark rm;
2823 ModuleEntry* m = _package_entry->module();
2824 log_trace(module)("Setting package: class: %s, package: %s, loader: %s, module: %s",
2825 external_name(),
2826 pkg_name->as_C_string(),
2827 loader_data->loader_name_and_id(),
2828 (m->is_named() ? m->name()->as_C_string() : UNNAMED_MODULE));
2829 }
2830 } else {
2831 ResourceMark rm;
2832 log_trace(module)("Setting package: class: %s, package: unnamed, loader: %s, module: %s",
2833 external_name(),
2834 (loader_data != NULL) ? loader_data->loader_name_and_id() : "NULL",
2835 UNNAMED_MODULE);
2836 }
2837 }
2838
2839
2840 // different versions of is_same_class_package
2841
2842 bool InstanceKlass::is_same_class_package(const Klass* class2) const {
2843 oop classloader1 = this->class_loader();
2844 PackageEntry* classpkg1 = this->package();
2845 if (class2->is_objArray_klass()) {
2846 class2 = ObjArrayKlass::cast(class2)->bottom_klass();
2847 }
2848
2849 oop classloader2;
2850 PackageEntry* classpkg2;
2851 if (class2->is_instance_klass()) {
2852 classloader2 = class2->class_loader();
2853 classpkg2 = class2->package();
2854 } else {
2855 assert(class2->is_typeArray_klass(), "should be type array");
2856 classloader2 = NULL;
2857 classpkg2 = NULL;
2858 }
2859
2860 // Same package is determined by comparing class loader
2861 // and package entries. Both must be the same. This rule
2862 // applies even to classes that are defined in the unnamed
2863 // package, they still must have the same class loader.
2864 if (oopDesc::equals(classloader1, classloader2) && (classpkg1 == classpkg2)) {
2865 return true;
2866 }
2867
2868 return false;
2869 }
2870
2871 // return true if this class and other_class are in the same package. Classloader
2872 // and classname information is enough to determine a class's package
2873 bool InstanceKlass::is_same_class_package(oop other_class_loader,
2874 const Symbol* other_class_name) const {
2875 if (!oopDesc::equals(class_loader(), other_class_loader)) {
2876 return false;
2877 }
2878 if (name()->fast_compare(other_class_name) == 0) {
2879 return true;
2880 }
2881
2882 {
2883 ResourceMark rm;
2884
2885 bool bad_class_name = false;
2886 const char* other_pkg =
2887 ClassLoader::package_from_name((const char*) other_class_name->as_C_string(), &bad_class_name);
2888 if (bad_class_name) {
2889 return false;
2890 }
2891 // Check that package_from_name() returns NULL, not "", if there is no package.
2892 assert(other_pkg == NULL || strlen(other_pkg) > 0, "package name is empty string");
2893
2894 const Symbol* const this_package_name =
2895 this->package() != NULL ? this->package()->name() : NULL;
2896
2897 if (this_package_name == NULL || other_pkg == NULL) {
2898 // One of the two doesn't have a package. Only return true if the other
2899 // one also doesn't have a package.
2900 return (const char*)this_package_name == other_pkg;
2901 }
2902
2903 // Check if package is identical
2904 return this_package_name->equals(other_pkg);
2905 }
2906 }
2907
2908 // Returns true iff super_method can be overridden by a method in targetclassname
2909 // See JLS 3rd edition 8.4.6.1
2910 // Assumes name-signature match
2911 // "this" is InstanceKlass of super_method which must exist
2912 // note that the InstanceKlass of the method in the targetclassname has not always been created yet
2913 bool InstanceKlass::is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS) {
2914 // Private methods can not be overridden
2915 if (super_method->is_private()) {
2916 return false;
2917 }
2918 // If super method is accessible, then override
2919 if ((super_method->is_protected()) ||
2920 (super_method->is_public())) {
2921 return true;
2922 }
2923 // Package-private methods are not inherited outside of package
2924 assert(super_method->is_package_private(), "must be package private");
2925 return(is_same_class_package(targetclassloader(), targetclassname));
2926 }
2927
2928 // Only boot and platform class loaders can define classes in "java/" packages.
2929 void InstanceKlass::check_prohibited_package(Symbol* class_name,
2930 ClassLoaderData* loader_data,
2931 TRAPS) {
2932 if (!loader_data->is_boot_class_loader_data() &&
2933 !loader_data->is_platform_class_loader_data() &&
2934 class_name != NULL) {
2935 ResourceMark rm(THREAD);
2936 char* name = class_name->as_C_string();
2937 if (strncmp(name, JAVAPKG, JAVAPKG_LEN) == 0 && name[JAVAPKG_LEN] == '/') {
2938 TempNewSymbol pkg_name = InstanceKlass::package_from_name(class_name, CHECK);
2939 assert(pkg_name != NULL, "Error in parsing package name starting with 'java/'");
2940 name = pkg_name->as_C_string();
2941 const char* class_loader_name = loader_data->loader_name_and_id();
2942 StringUtils::replace_no_expand(name, "/", ".");
2943 const char* msg_text1 = "Class loader (instance of): ";
2944 const char* msg_text2 = " tried to load prohibited package name: ";
2945 size_t len = strlen(msg_text1) + strlen(class_loader_name) + strlen(msg_text2) + strlen(name) + 1;
2946 char* message = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, char, len);
2947 jio_snprintf(message, len, "%s%s%s%s", msg_text1, class_loader_name, msg_text2, name);
2948 THROW_MSG(vmSymbols::java_lang_SecurityException(), message);
2949 }
2950 }
2951 return;
2952 }
2953
2954 bool InstanceKlass::find_inner_classes_attr(int* ooff, int* noff, TRAPS) const {
2955 constantPoolHandle i_cp(THREAD, constants());
2956 for (InnerClassesIterator iter(this); !iter.done(); iter.next()) {
2957 int ioff = iter.inner_class_info_index();
2958 if (ioff != 0) {
2959 // Check to see if the name matches the class we're looking for
2960 // before attempting to find the class.
2961 if (i_cp->klass_name_at_matches(this, ioff)) {
2962 Klass* inner_klass = i_cp->klass_at(ioff, CHECK_false);
2963 if (this == inner_klass) {
2964 *ooff = iter.outer_class_info_index();
2965 *noff = iter.inner_name_index();
2966 return true;
2967 }
2968 }
2969 }
2970 }
2971 return false;
2972 }
2973
2974 InstanceKlass* InstanceKlass::compute_enclosing_class(bool* inner_is_member, TRAPS) const {
2975 InstanceKlass* outer_klass = NULL;
2976 *inner_is_member = false;
2977 int ooff = 0, noff = 0;
2978 bool has_inner_classes_attr = find_inner_classes_attr(&ooff, &noff, THREAD);
2979 if (has_inner_classes_attr) {
2980 constantPoolHandle i_cp(THREAD, constants());
2981 if (ooff != 0) {
2982 Klass* ok = i_cp->klass_at(ooff, CHECK_NULL);
2983 outer_klass = InstanceKlass::cast(ok);
2984 *inner_is_member = true;
2985 }
2986 if (NULL == outer_klass) {
2987 // It may be unsafe anonymous; try for that.
2988 int encl_method_class_idx = enclosing_method_class_index();
2989 if (encl_method_class_idx != 0) {
2990 Klass* ok = i_cp->klass_at(encl_method_class_idx, CHECK_NULL);
2991 outer_klass = InstanceKlass::cast(ok);
2992 *inner_is_member = false;
2993 }
2994 }
2995 }
2996
2997 // If no inner class attribute found for this class.
2998 if (NULL == outer_klass) return NULL;
2999
3000 // Throws an exception if outer klass has not declared k as an inner klass
3001 // We need evidence that each klass knows about the other, or else
3002 // the system could allow a spoof of an inner class to gain access rights.
3003 Reflection::check_for_inner_class(outer_klass, this, *inner_is_member, CHECK_NULL);
3004 return outer_klass;
3005 }
3006
3007 jint InstanceKlass::compute_modifier_flags(TRAPS) const {
3008 jint access = access_flags().as_int();
3009
3010 // But check if it happens to be member class.
3011 InnerClassesIterator iter(this);
3012 for (; !iter.done(); iter.next()) {
3013 int ioff = iter.inner_class_info_index();
3014 // Inner class attribute can be zero, skip it.
3015 // Strange but true: JVM spec. allows null inner class refs.
3016 if (ioff == 0) continue;
3017
3018 // only look at classes that are already loaded
3019 // since we are looking for the flags for our self.
3020 Symbol* inner_name = constants()->klass_name_at(ioff);
3021 if (name() == inner_name) {
3022 // This is really a member class.
3023 access = iter.inner_access_flags();
3024 break;
3025 }
3026 }
3027 // Remember to strip ACC_SUPER bit
3028 return (access & (~JVM_ACC_SUPER)) & JVM_ACC_WRITTEN_FLAGS;
3029 }
3030
3031 jint InstanceKlass::jvmti_class_status() const {
3032 jint result = 0;
3033
3034 if (is_linked()) {
3035 result |= JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED;
3036 }
3037
3038 if (is_initialized()) {
3039 assert(is_linked(), "Class status is not consistent");
3040 result |= JVMTI_CLASS_STATUS_INITIALIZED;
3041 }
3042 if (is_in_error_state()) {
3043 result |= JVMTI_CLASS_STATUS_ERROR;
3044 }
3045 return result;
3046 }
3047
3048 Method* InstanceKlass::method_at_itable(Klass* holder, int index, TRAPS) {
3049 itableOffsetEntry* ioe = (itableOffsetEntry*)start_of_itable();
3050 int method_table_offset_in_words = ioe->offset()/wordSize;
3051 int nof_interfaces = (method_table_offset_in_words - itable_offset_in_words())
3052 / itableOffsetEntry::size();
3053
3054 for (int cnt = 0 ; ; cnt ++, ioe ++) {
3055 // If the interface isn't implemented by the receiver class,
3056 // the VM should throw IncompatibleClassChangeError.
3057 if (cnt >= nof_interfaces) {
3058 ResourceMark rm(THREAD);
3059 stringStream ss;
3060 bool same_module = (module() == holder->module());
3061 ss.print("Receiver class %s does not implement "
3062 "the interface %s defining the method to be called "
3063 "(%s%s%s)",
3064 external_name(), holder->external_name(),
3065 (same_module) ? joint_in_module_of_loader(holder) : class_in_module_of_loader(),
3066 (same_module) ? "" : "; ",
3067 (same_module) ? "" : holder->class_in_module_of_loader());
3068 THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
3069 }
3070
3071 Klass* ik = ioe->interface_klass();
3072 if (ik == holder) break;
3073 }
3074
3075 itableMethodEntry* ime = ioe->first_method_entry(this);
3076 Method* m = ime[index].method();
3077 if (m == NULL) {
3078 THROW_NULL(vmSymbols::java_lang_AbstractMethodError());
3079 }
3080 return m;
3081 }
3082
3083
3084 #if INCLUDE_JVMTI
3085 // update default_methods for redefineclasses for methods that are
3086 // not yet in the vtable due to concurrent subclass define and superinterface
3087 // redefinition
3088 // Note: those in the vtable, should have been updated via adjust_method_entries
3089 void InstanceKlass::adjust_default_methods(bool* trace_name_printed) {
3090 // search the default_methods for uses of either obsolete or EMCP methods
3091 if (default_methods() != NULL) {
3092 for (int index = 0; index < default_methods()->length(); index ++) {
3093 Method* old_method = default_methods()->at(index);
3094 if (old_method == NULL || !old_method->is_old()) {
3095 continue; // skip uninteresting entries
3096 }
3097 assert(!old_method->is_deleted(), "default methods may not be deleted");
3098 Method* new_method = old_method->get_new_method();
3099 default_methods()->at_put(index, new_method);
3100
3101 if (log_is_enabled(Info, redefine, class, update)) {
3102 ResourceMark rm;
3103 if (!(*trace_name_printed)) {
3104 log_info(redefine, class, update)
3105 ("adjust: klassname=%s default methods from name=%s",
3106 external_name(), old_method->method_holder()->external_name());
3107 *trace_name_printed = true;
3108 }
3109 log_debug(redefine, class, update, vtables)
3110 ("default method update: %s(%s) ",
3111 new_method->name()->as_C_string(), new_method->signature()->as_C_string());
3112 }
3113 }
3114 }
3115 }
3116 #endif // INCLUDE_JVMTI
3117
3118 // On-stack replacement stuff
3119 void InstanceKlass::add_osr_nmethod(nmethod* n) {
3120 #ifndef PRODUCT
3121 if (TieredCompilation) {
3122 nmethod * prev = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), n->comp_level(), true);
3123 assert(prev == NULL || !prev->is_in_use(),
3124 "redundunt OSR recompilation detected. memory leak in CodeCache!");
3125 }
3126 #endif
3127 // only one compilation can be active
3128 {
3129 // This is a short non-blocking critical region, so the no safepoint check is ok.
3130 MutexLocker ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
3131 assert(n->is_osr_method(), "wrong kind of nmethod");
3132 n->set_osr_link(osr_nmethods_head());
3133 set_osr_nmethods_head(n);
3134 // Raise the highest osr level if necessary
3135 if (TieredCompilation) {
3136 Method* m = n->method();
3137 m->set_highest_osr_comp_level(MAX2(m->highest_osr_comp_level(), n->comp_level()));
3138 }
3139 }
3140
3141 // Get rid of the osr methods for the same bci that have lower levels.
3142 if (TieredCompilation) {
3143 for (int l = CompLevel_limited_profile; l < n->comp_level(); l++) {
3144 nmethod *inv = lookup_osr_nmethod(n->method(), n->osr_entry_bci(), l, true);
3145 if (inv != NULL && inv->is_in_use()) {
3146 inv->make_not_entrant();
3147 }
3148 }
3149 }
3150 }
3151
3152 // Remove osr nmethod from the list. Return true if found and removed.
3153 bool InstanceKlass::remove_osr_nmethod(nmethod* n) {
3154 // This is a short non-blocking critical region, so the no safepoint check is ok.
3155 MutexLocker ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
3156 assert(n->is_osr_method(), "wrong kind of nmethod");
3157 nmethod* last = NULL;
3158 nmethod* cur = osr_nmethods_head();
3159 int max_level = CompLevel_none; // Find the max comp level excluding n
3160 Method* m = n->method();
3161 // Search for match
3162 bool found = false;
3163 while(cur != NULL && cur != n) {
3164 if (TieredCompilation && m == cur->method()) {
3165 // Find max level before n
3166 max_level = MAX2(max_level, cur->comp_level());
3167 }
3168 last = cur;
3169 cur = cur->osr_link();
3170 }
3171 nmethod* next = NULL;
3172 if (cur == n) {
3173 found = true;
3174 next = cur->osr_link();
3175 if (last == NULL) {
3176 // Remove first element
3177 set_osr_nmethods_head(next);
3178 } else {
3179 last->set_osr_link(next);
3180 }
3181 }
3182 n->set_osr_link(NULL);
3183 if (TieredCompilation) {
3184 cur = next;
3185 while (cur != NULL) {
3186 // Find max level after n
3187 if (m == cur->method()) {
3188 max_level = MAX2(max_level, cur->comp_level());
3189 }
3190 cur = cur->osr_link();
3191 }
3192 m->set_highest_osr_comp_level(max_level);
3193 }
3194 return found;
3195 }
3196
3197 int InstanceKlass::mark_osr_nmethods(const Method* m) {
3198 // This is a short non-blocking critical region, so the no safepoint check is ok.
3199 MutexLocker ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
3200 nmethod* osr = osr_nmethods_head();
3201 int found = 0;
3202 while (osr != NULL) {
3203 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3204 if (osr->method() == m) {
3205 osr->mark_for_deoptimization();
3206 found++;
3207 }
3208 osr = osr->osr_link();
3209 }
3210 return found;
3211 }
3212
3213 nmethod* InstanceKlass::lookup_osr_nmethod(const Method* m, int bci, int comp_level, bool match_level) const {
3214 // This is a short non-blocking critical region, so the no safepoint check is ok.
3215 MutexLocker ml(OsrList_lock, Mutex::_no_safepoint_check_flag);
3216 nmethod* osr = osr_nmethods_head();
3217 nmethod* best = NULL;
3218 while (osr != NULL) {
3219 assert(osr->is_osr_method(), "wrong kind of nmethod found in chain");
3220 // There can be a time when a c1 osr method exists but we are waiting
3221 // for a c2 version. When c2 completes its osr nmethod we will trash
3222 // the c1 version and only be able to find the c2 version. However
3223 // while we overflow in the c1 code at back branches we don't want to
3224 // try and switch to the same code as we are already running
3225
3226 if (osr->method() == m &&
3227 (bci == InvocationEntryBci || osr->osr_entry_bci() == bci)) {
3228 if (match_level) {
3229 if (osr->comp_level() == comp_level) {
3230 // Found a match - return it.
3231 return osr;
3232 }
3233 } else {
3234 if (best == NULL || (osr->comp_level() > best->comp_level())) {
3235 if (osr->comp_level() == CompLevel_highest_tier) {
3236 // Found the best possible - return it.
3237 return osr;
3238 }
3239 best = osr;
3240 }
3241 }
3242 }
3243 osr = osr->osr_link();
3244 }
3245
3246 assert(match_level == false || best == NULL, "shouldn't pick up anything if match_level is set");
3247 if (best != NULL && best->comp_level() >= comp_level) {
3248 return best;
3249 }
3250 return NULL;
3251 }
3252
3253 // -----------------------------------------------------------------------------------------------------
3254 // Printing
3255
3256 #ifndef PRODUCT
3257
3258 #define BULLET " - "
3259
3260 static const char* state_names[] = {
3261 "allocated", "loaded", "linked", "being_initialized", "fully_initialized", "initialization_error"
3262 };
3263
3264 static void print_vtable(address self, intptr_t* start, int len, outputStream* st) {
3265 ResourceMark rm;
3266 int* forward_refs = NEW_RESOURCE_ARRAY(int, len);
3267 for (int i = 0; i < len; i++) forward_refs[i] = 0;
3268 for (int i = 0; i < len; i++) {
3269 intptr_t e = start[i];
3270 st->print("%d : " INTPTR_FORMAT, i, e);
3271 if (forward_refs[i] != 0) {
3272 int from = forward_refs[i];
3273 int off = (int) start[from];
3274 st->print(" (offset %d <= [%d])", off, from);
3275 }
3276 if (MetaspaceObj::is_valid((Metadata*)e)) {
3277 st->print(" ");
3278 ((Metadata*)e)->print_value_on(st);
3279 } else if (self != NULL && e > 0 && e < 0x10000) {
3280 address location = self + e;
3281 int index = (int)((intptr_t*)location - start);
3282 st->print(" (offset %d => [%d])", (int)e, index);
3283 if (index >= 0 && index < len)
3284 forward_refs[index] = i;
3285 }
3286 st->cr();
3287 }
3288 }
3289
3290 static void print_vtable(vtableEntry* start, int len, outputStream* st) {
3291 return print_vtable(NULL, reinterpret_cast<intptr_t*>(start), len, st);
3292 }
3293
3294 template<typename T>
3295 static void print_array_on(outputStream* st, Array<T>* array) {
3296 if (array == NULL) { st->print_cr("NULL"); return; }
3297 array->print_value_on(st); st->cr();
3298 if (Verbose || WizardMode) {
3299 for (int i = 0; i < array->length(); i++) {
3300 st->print("%d : ", i); array->at(i)->print_value_on(st); st->cr();
3301 }
3302 }
3303 }
3304
3305 static void print_array_on(outputStream* st, Array<int>* array) {
3306 if (array == NULL) { st->print_cr("NULL"); return; }
3307 array->print_value_on(st); st->cr();
3308 if (Verbose || WizardMode) {
3309 for (int i = 0; i < array->length(); i++) {
3310 st->print("%d : %d", i, array->at(i)); st->cr();
3311 }
3312 }
3313 }
3314
3315 void InstanceKlass::print_on(outputStream* st) const {
3316 assert(is_klass(), "must be klass");
3317 Klass::print_on(st);
3318
3319 st->print(BULLET"instance size: %d", size_helper()); st->cr();
3320 st->print(BULLET"klass size: %d", size()); st->cr();
3321 st->print(BULLET"access: "); access_flags().print_on(st); st->cr();
3322 st->print(BULLET"misc flags: 0x%x", _misc_flags); st->cr();
3323 st->print(BULLET"state: "); st->print_cr("%s", state_names[_init_state]);
3324 st->print(BULLET"name: "); name()->print_value_on(st); st->cr();
3325 st->print(BULLET"super: "); Metadata::print_value_on_maybe_null(st, super()); st->cr();
3326 st->print(BULLET"sub: ");
3327 Klass* sub = subklass();
3328 int n;
3329 for (n = 0; sub != NULL; n++, sub = sub->next_sibling()) {
3330 if (n < MaxSubklassPrintSize) {
3331 sub->print_value_on(st);
3332 st->print(" ");
3333 }
3334 }
3335 if (n >= MaxSubklassPrintSize) st->print("(" INTX_FORMAT " more klasses...)", n - MaxSubklassPrintSize);
3336 st->cr();
3337
3338 if (is_interface()) {
3339 st->print_cr(BULLET"nof implementors: %d", nof_implementors());
3340 if (nof_implementors() == 1) {
3341 st->print_cr(BULLET"implementor: ");
3342 st->print(" ");
3343 implementor()->print_value_on(st);
3344 st->cr();
3345 }
3346 }
3347
3348 st->print(BULLET"arrays: "); Metadata::print_value_on_maybe_null(st, array_klasses()); st->cr();
3349 st->print(BULLET"methods: "); print_array_on(st, methods());
3350 st->print(BULLET"method ordering: "); print_array_on(st, method_ordering());
3351 st->print(BULLET"default_methods: "); print_array_on(st, default_methods());
3352 if (default_vtable_indices() != NULL) {
3353 st->print(BULLET"default vtable indices: "); print_array_on(st, default_vtable_indices());
3354 }
3355 st->print(BULLET"local interfaces: "); print_array_on(st, local_interfaces());
3356 st->print(BULLET"trans. interfaces: "); print_array_on(st, transitive_interfaces());
3357 st->print(BULLET"constants: "); constants()->print_value_on(st); st->cr();
3358 if (class_loader_data() != NULL) {
3359 st->print(BULLET"class loader data: ");
3360 class_loader_data()->print_value_on(st);
3361 st->cr();
3362 }
3363 st->print(BULLET"unsafe anonymous host class: "); Metadata::print_value_on_maybe_null(st, unsafe_anonymous_host()); st->cr();
3364 if (source_file_name() != NULL) {
3365 st->print(BULLET"source file: ");
3366 source_file_name()->print_value_on(st);
3367 st->cr();
3368 }
3369 if (source_debug_extension() != NULL) {
3370 st->print(BULLET"source debug extension: ");
3371 st->print("%s", source_debug_extension());
3372 st->cr();
3373 }
3374 st->print(BULLET"class annotations: "); class_annotations()->print_value_on(st); st->cr();
3375 st->print(BULLET"class type annotations: "); class_type_annotations()->print_value_on(st); st->cr();
3376 st->print(BULLET"field annotations: "); fields_annotations()->print_value_on(st); st->cr();
3377 st->print(BULLET"field type annotations: "); fields_type_annotations()->print_value_on(st); st->cr();
3378 {
3379 bool have_pv = false;
3380 // previous versions are linked together through the InstanceKlass
3381 for (InstanceKlass* pv_node = previous_versions();
3382 pv_node != NULL;
3383 pv_node = pv_node->previous_versions()) {
3384 if (!have_pv)
3385 st->print(BULLET"previous version: ");
3386 have_pv = true;
3387 pv_node->constants()->print_value_on(st);
3388 }
3389 if (have_pv) st->cr();
3390 }
3391
3392 if (generic_signature() != NULL) {
3393 st->print(BULLET"generic signature: ");
3394 generic_signature()->print_value_on(st);
3395 st->cr();
3396 }
3397 st->print(BULLET"inner classes: "); inner_classes()->print_value_on(st); st->cr();
3398 st->print(BULLET"nest members: "); nest_members()->print_value_on(st); st->cr();
3399 if (java_mirror() != NULL) {
3400 st->print(BULLET"java mirror: ");
3401 java_mirror()->print_value_on(st);
3402 st->cr();
3403 } else {
3404 st->print_cr(BULLET"java mirror: NULL");
3405 }
3406 st->print(BULLET"vtable length %d (start addr: " INTPTR_FORMAT ")", vtable_length(), p2i(start_of_vtable())); st->cr();
3407 if (vtable_length() > 0 && (Verbose || WizardMode)) print_vtable(start_of_vtable(), vtable_length(), st);
3408 st->print(BULLET"itable length %d (start addr: " INTPTR_FORMAT ")", itable_length(), p2i(start_of_itable())); st->cr();
3409 if (itable_length() > 0 && (Verbose || WizardMode)) print_vtable(NULL, start_of_itable(), itable_length(), st);
3410 st->print_cr(BULLET"---- static fields (%d words):", static_field_size());
3411 FieldPrinter print_static_field(st);
3412 ((InstanceKlass*)this)->do_local_static_fields(&print_static_field);
3413 st->print_cr(BULLET"---- non-static fields (%d words):", nonstatic_field_size());
3414 FieldPrinter print_nonstatic_field(st);
3415 InstanceKlass* ik = const_cast<InstanceKlass*>(this);
3416 ik->do_nonstatic_fields(&print_nonstatic_field);
3417
3418 st->print(BULLET"non-static oop maps: ");
3419 OopMapBlock* map = start_of_nonstatic_oop_maps();
3420 OopMapBlock* end_map = map + nonstatic_oop_map_count();
3421 while (map < end_map) {
3422 st->print("%d-%d ", map->offset(), map->offset() + heapOopSize*(map->count() - 1));
3423 map++;
3424 }
3425 st->cr();
3426 }
3427
3428 #endif //PRODUCT
3429
3430 void InstanceKlass::print_value_on(outputStream* st) const {
3431 assert(is_klass(), "must be klass");
3432 if (Verbose || WizardMode) access_flags().print_on(st);
3433 name()->print_value_on(st);
3434 }
3435
3436 #ifndef PRODUCT
3437
3438 void FieldPrinter::do_field(fieldDescriptor* fd) {
3439 _st->print(BULLET);
3440 if (_obj == NULL) {
3441 fd->print_on(_st);
3442 _st->cr();
3443 } else {
3444 fd->print_on_for(_st, _obj);
3445 _st->cr();
3446 }
3447 }
3448
3449
3450 void InstanceKlass::oop_print_on(oop obj, outputStream* st) {
3451 Klass::oop_print_on(obj, st);
3452
3453 if (this == SystemDictionary::String_klass()) {
3454 typeArrayOop value = java_lang_String::value(obj);
3455 juint length = java_lang_String::length(obj);
3456 if (value != NULL &&
3457 value->is_typeArray() &&
3458 length <= (juint) value->length()) {
3459 st->print(BULLET"string: ");
3460 java_lang_String::print(obj, st);
3461 st->cr();
3462 if (!WizardMode) return; // that is enough
3463 }
3464 }
3465
3466 st->print_cr(BULLET"---- fields (total size %d words):", oop_size(obj));
3467 FieldPrinter print_field(st, obj);
3468 do_nonstatic_fields(&print_field);
3469
3470 if (this == SystemDictionary::Class_klass()) {
3471 st->print(BULLET"signature: ");
3472 java_lang_Class::print_signature(obj, st);
3473 st->cr();
3474 Klass* mirrored_klass = java_lang_Class::as_Klass(obj);
3475 st->print(BULLET"fake entry for mirror: ");
3476 Metadata::print_value_on_maybe_null(st, mirrored_klass);
3477 st->cr();
3478 Klass* array_klass = java_lang_Class::array_klass_acquire(obj);
3479 st->print(BULLET"fake entry for array: ");
3480 Metadata::print_value_on_maybe_null(st, array_klass);
3481 st->cr();
3482 st->print_cr(BULLET"fake entry for oop_size: %d", java_lang_Class::oop_size(obj));
3483 st->print_cr(BULLET"fake entry for static_oop_field_count: %d", java_lang_Class::static_oop_field_count(obj));
3484 Klass* real_klass = java_lang_Class::as_Klass(obj);
3485 if (real_klass != NULL && real_klass->is_instance_klass()) {
3486 InstanceKlass::cast(real_klass)->do_local_static_fields(&print_field);
3487 }
3488 } else if (this == SystemDictionary::MethodType_klass()) {
3489 st->print(BULLET"signature: ");
3490 java_lang_invoke_MethodType::print_signature(obj, st);
3491 st->cr();
3492 }
3493 }
3494
3495 bool InstanceKlass::verify_itable_index(int i) {
3496 int method_count = klassItable::method_count_for_interface(this);
3497 assert(i >= 0 && i < method_count, "index out of bounds");
3498 return true;
3499 }
3500
3501 #endif //PRODUCT
3502
3503 void InstanceKlass::oop_print_value_on(oop obj, outputStream* st) {
3504 st->print("a ");
3505 name()->print_value_on(st);
3506 obj->print_address_on(st);
3507 if (this == SystemDictionary::String_klass()
3508 && java_lang_String::value(obj) != NULL) {
3509 ResourceMark rm;
3510 int len = java_lang_String::length(obj);
3511 int plen = (len < 24 ? len : 12);
3512 char* str = java_lang_String::as_utf8_string(obj, 0, plen);
3513 st->print(" = \"%s\"", str);
3514 if (len > plen)
3515 st->print("...[%d]", len);
3516 } else if (this == SystemDictionary::Class_klass()) {
3517 Klass* k = java_lang_Class::as_Klass(obj);
3518 st->print(" = ");
3519 if (k != NULL) {
3520 k->print_value_on(st);
3521 } else {
3522 const char* tname = type2name(java_lang_Class::primitive_type(obj));
3523 st->print("%s", tname ? tname : "type?");
3524 }
3525 } else if (this == SystemDictionary::MethodType_klass()) {
3526 st->print(" = ");
3527 java_lang_invoke_MethodType::print_signature(obj, st);
3528 } else if (java_lang_boxing_object::is_instance(obj)) {
3529 st->print(" = ");
3530 java_lang_boxing_object::print(obj, st);
3531 } else if (this == SystemDictionary::LambdaForm_klass()) {
3532 oop vmentry = java_lang_invoke_LambdaForm::vmentry(obj);
3533 if (vmentry != NULL) {
3534 st->print(" => ");
3535 vmentry->print_value_on(st);
3536 }
3537 } else if (this == SystemDictionary::MemberName_klass()) {
3538 Metadata* vmtarget = java_lang_invoke_MemberName::vmtarget(obj);
3539 if (vmtarget != NULL) {
3540 st->print(" = ");
3541 vmtarget->print_value_on(st);
3542 } else {
3543 java_lang_invoke_MemberName::clazz(obj)->print_value_on(st);
3544 st->print(".");
3545 java_lang_invoke_MemberName::name(obj)->print_value_on(st);
3546 }
3547 }
3548 }
3549
3550 const char* InstanceKlass::internal_name() const {
3551 return external_name();
3552 }
3553
3554 void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data,
3555 const char* module_name,
3556 const ClassFileStream* cfs) const {
3557 if (!log_is_enabled(Info, class, load)) {
3558 return;
3559 }
3560
3561 ResourceMark rm;
3562 LogMessage(class, load) msg;
3563 stringStream info_stream;
3564
3565 // Name and class hierarchy info
3566 info_stream.print("%s", external_name());
3567
3568 // Source
3569 if (cfs != NULL) {
3570 if (cfs->source() != NULL) {
3571 if (module_name != NULL) {
3572 // When the boot loader created the stream, it didn't know the module name
3573 // yet. Let's format it now.
3574 if (cfs->from_boot_loader_modules_image()) {
3575 info_stream.print(" source: jrt:/%s", module_name);
3576 } else {
3577 info_stream.print(" source: %s", cfs->source());
3578 }
3579 } else {
3580 info_stream.print(" source: %s", cfs->source());
3581 }
3582 } else if (loader_data == ClassLoaderData::the_null_class_loader_data()) {
3583 Thread* THREAD = Thread::current();
3584 Klass* caller =
3585 THREAD->is_Java_thread()
3586 ? ((JavaThread*)THREAD)->security_get_caller_class(1)
3587 : NULL;
3588 // caller can be NULL, for example, during a JVMTI VM_Init hook
3589 if (caller != NULL) {
3590 info_stream.print(" source: instance of %s", caller->external_name());
3591 } else {
3592 // source is unknown
3593 }
3594 } else {
3595 oop class_loader = loader_data->class_loader();
3596 info_stream.print(" source: %s", class_loader->klass()->external_name());
3597 }
3598 } else {
3599 assert(this->is_shared(), "must be");
3600 if (MetaspaceShared::is_shared_dynamic((void*)this)) {
3601 info_stream.print(" source: shared objects file (top)");
3602 } else {
3603 info_stream.print(" source: shared objects file");
3604 }
3605 }
3606
3607 msg.info("%s", info_stream.as_string());
3608
3609 if (log_is_enabled(Debug, class, load)) {
3610 stringStream debug_stream;
3611
3612 // Class hierarchy info
3613 debug_stream.print(" klass: " INTPTR_FORMAT " super: " INTPTR_FORMAT,
3614 p2i(this), p2i(superklass()));
3615
3616 // Interfaces
3617 if (local_interfaces() != NULL && local_interfaces()->length() > 0) {
3618 debug_stream.print(" interfaces:");
3619 int length = local_interfaces()->length();
3620 for (int i = 0; i < length; i++) {
3621 debug_stream.print(" " INTPTR_FORMAT,
3622 p2i(InstanceKlass::cast(local_interfaces()->at(i))));
3623 }
3624 }
3625
3626 // Class loader
3627 debug_stream.print(" loader: [");
3628 loader_data->print_value_on(&debug_stream);
3629 debug_stream.print("]");
3630
3631 // Classfile checksum
3632 if (cfs) {
3633 debug_stream.print(" bytes: %d checksum: %08x",
3634 cfs->length(),
3635 ClassLoader::crc32(0, (const char*)cfs->buffer(),
3636 cfs->length()));
3637 }
3638
3639 msg.debug("%s", debug_stream.as_string());
3640 }
3641 }
3642
3643 #if INCLUDE_SERVICES
3644 // Size Statistics
3645 void InstanceKlass::collect_statistics(KlassSizeStats *sz) const {
3646 Klass::collect_statistics(sz);
3647
3648 sz->_inst_size = wordSize * size_helper();
3649 sz->_vtab_bytes = wordSize * vtable_length();
3650 sz->_itab_bytes = wordSize * itable_length();
3651 sz->_nonstatic_oopmap_bytes = wordSize * nonstatic_oop_map_size();
3652
3653 int n = 0;
3654 n += (sz->_methods_array_bytes = sz->count_array(methods()));
3655 n += (sz->_method_ordering_bytes = sz->count_array(method_ordering()));
3656 n += (sz->_local_interfaces_bytes = sz->count_array(local_interfaces()));
3657 n += (sz->_transitive_interfaces_bytes = sz->count_array(transitive_interfaces()));
3658 n += (sz->_fields_bytes = sz->count_array(fields()));
3659 n += (sz->_inner_classes_bytes = sz->count_array(inner_classes()));
3660 n += (sz->_nest_members_bytes = sz->count_array(nest_members()));
3661 sz->_ro_bytes += n;
3662
3663 const ConstantPool* cp = constants();
3664 if (cp) {
3665 cp->collect_statistics(sz);
3666 }
3667
3668 const Annotations* anno = annotations();
3669 if (anno) {
3670 anno->collect_statistics(sz);
3671 }
3672
3673 const Array<Method*>* methods_array = methods();
3674 if (methods()) {
3675 for (int i = 0; i < methods_array->length(); i++) {
3676 Method* method = methods_array->at(i);
3677 if (method) {
3678 sz->_method_count ++;
3679 method->collect_statistics(sz);
3680 }
3681 }
3682 }
3683 }
3684 #endif // INCLUDE_SERVICES
3685
3686 // Verification
3687
3688 class VerifyFieldClosure: public BasicOopIterateClosure {
3689 protected:
3690 template <class T> void do_oop_work(T* p) {
3691 oop obj = RawAccess<>::oop_load(p);
3692 if (!oopDesc::is_oop_or_null(obj)) {
3693 tty->print_cr("Failed: " PTR_FORMAT " -> " PTR_FORMAT, p2i(p), p2i(obj));
3694 Universe::print_on(tty);
3695 guarantee(false, "boom");
3696 }
3697 }
3698 public:
3699 virtual void do_oop(oop* p) { VerifyFieldClosure::do_oop_work(p); }
3700 virtual void do_oop(narrowOop* p) { VerifyFieldClosure::do_oop_work(p); }
3701 };
3702
3703 void InstanceKlass::verify_on(outputStream* st) {
3704 #ifndef PRODUCT
3705 // Avoid redundant verifies, this really should be in product.
3706 if (_verify_count == Universe::verify_count()) return;
3707 _verify_count = Universe::verify_count();
3708 #endif
3709
3710 // Verify Klass
3711 Klass::verify_on(st);
3712
3713 // Verify that klass is present in ClassLoaderData
3714 guarantee(class_loader_data()->contains_klass(this),
3715 "this class isn't found in class loader data");
3716
3717 // Verify vtables
3718 if (is_linked()) {
3719 // $$$ This used to be done only for m/s collections. Doing it
3720 // always seemed a valid generalization. (DLD -- 6/00)
3721 vtable().verify(st);
3722 }
3723
3724 // Verify first subklass
3725 if (subklass() != NULL) {
3726 guarantee(subklass()->is_klass(), "should be klass");
3727 }
3728
3729 // Verify siblings
3730 Klass* super = this->super();
3731 Klass* sib = next_sibling();
3732 if (sib != NULL) {
3733 if (sib == this) {
3734 fatal("subclass points to itself " PTR_FORMAT, p2i(sib));
3735 }
3736
3737 guarantee(sib->is_klass(), "should be klass");
3738 guarantee(sib->super() == super, "siblings should have same superklass");
3739 }
3740
3741 // Verify local interfaces
3742 if (local_interfaces()) {
3743 Array<InstanceKlass*>* local_interfaces = this->local_interfaces();
3744 for (int j = 0; j < local_interfaces->length(); j++) {
3745 InstanceKlass* e = local_interfaces->at(j);
3746 guarantee(e->is_klass() && e->is_interface(), "invalid local interface");
3747 }
3748 }
3749
3750 // Verify transitive interfaces
3751 if (transitive_interfaces() != NULL) {
3752 Array<InstanceKlass*>* transitive_interfaces = this->transitive_interfaces();
3753 for (int j = 0; j < transitive_interfaces->length(); j++) {
3754 InstanceKlass* e = transitive_interfaces->at(j);
3755 guarantee(e->is_klass() && e->is_interface(), "invalid transitive interface");
3756 }
3757 }
3758
3759 // Verify methods
3760 if (methods() != NULL) {
3761 Array<Method*>* methods = this->methods();
3762 for (int j = 0; j < methods->length(); j++) {
3763 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3764 }
3765 for (int j = 0; j < methods->length() - 1; j++) {
3766 Method* m1 = methods->at(j);
3767 Method* m2 = methods->at(j + 1);
3768 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3769 }
3770 }
3771
3772 // Verify method ordering
3773 if (method_ordering() != NULL) {
3774 Array<int>* method_ordering = this->method_ordering();
3775 int length = method_ordering->length();
3776 if (JvmtiExport::can_maintain_original_method_order() ||
3777 ((UseSharedSpaces || DumpSharedSpaces) && length != 0)) {
3778 guarantee(length == methods()->length(), "invalid method ordering length");
3779 jlong sum = 0;
3780 for (int j = 0; j < length; j++) {
3781 int original_index = method_ordering->at(j);
3782 guarantee(original_index >= 0, "invalid method ordering index");
3783 guarantee(original_index < length, "invalid method ordering index");
3784 sum += original_index;
3785 }
3786 // Verify sum of indices 0,1,...,length-1
3787 guarantee(sum == ((jlong)length*(length-1))/2, "invalid method ordering sum");
3788 } else {
3789 guarantee(length == 0, "invalid method ordering length");
3790 }
3791 }
3792
3793 // Verify default methods
3794 if (default_methods() != NULL) {
3795 Array<Method*>* methods = this->default_methods();
3796 for (int j = 0; j < methods->length(); j++) {
3797 guarantee(methods->at(j)->is_method(), "non-method in methods array");
3798 }
3799 for (int j = 0; j < methods->length() - 1; j++) {
3800 Method* m1 = methods->at(j);
3801 Method* m2 = methods->at(j + 1);
3802 guarantee(m1->name()->fast_compare(m2->name()) <= 0, "methods not sorted correctly");
3803 }
3804 }
3805
3806 // Verify JNI static field identifiers
3807 if (jni_ids() != NULL) {
3808 jni_ids()->verify(this);
3809 }
3810
3811 // Verify other fields
3812 if (array_klasses() != NULL) {
3813 guarantee(array_klasses()->is_klass(), "should be klass");
3814 }
3815 if (constants() != NULL) {
3816 guarantee(constants()->is_constantPool(), "should be constant pool");
3817 }
3818 const Klass* anonymous_host = unsafe_anonymous_host();
3819 if (anonymous_host != NULL) {
3820 guarantee(anonymous_host->is_klass(), "should be klass");
3821 }
3822 }
3823
3824 void InstanceKlass::oop_verify_on(oop obj, outputStream* st) {
3825 Klass::oop_verify_on(obj, st);
3826 VerifyFieldClosure blk;
3827 obj->oop_iterate(&blk);
3828 }
3829
3830
3831 // JNIid class for jfieldIDs only
3832 // Note to reviewers:
3833 // These JNI functions are just moved over to column 1 and not changed
3834 // in the compressed oops workspace.
3835 JNIid::JNIid(Klass* holder, int offset, JNIid* next) {
3836 _holder = holder;
3837 _offset = offset;
3838 _next = next;
3839 debug_only(_is_static_field_id = false;)
3840 }
3841
3842
3843 JNIid* JNIid::find(int offset) {
3844 JNIid* current = this;
3845 while (current != NULL) {
3846 if (current->offset() == offset) return current;
3847 current = current->next();
3848 }
3849 return NULL;
3850 }
3851
3852 void JNIid::deallocate(JNIid* current) {
3853 while (current != NULL) {
3854 JNIid* next = current->next();
3855 delete current;
3856 current = next;
3857 }
3858 }
3859
3860
3861 void JNIid::verify(Klass* holder) {
3862 int first_field_offset = InstanceMirrorKlass::offset_of_static_fields();
3863 int end_field_offset;
3864 end_field_offset = first_field_offset + (InstanceKlass::cast(holder)->static_field_size() * wordSize);
3865
3866 JNIid* current = this;
3867 while (current != NULL) {
3868 guarantee(current->holder() == holder, "Invalid klass in JNIid");
3869 #ifdef ASSERT
3870 int o = current->offset();
3871 if (current->is_static_field_id()) {
3872 guarantee(o >= first_field_offset && o < end_field_offset, "Invalid static field offset in JNIid");
3873 }
3874 #endif
3875 current = current->next();
3876 }
3877 }
3878
3879 void InstanceKlass::set_init_state(ClassState state) {
3880 #ifdef ASSERT
3881 bool good_state = is_shared() ? (_init_state <= state)
3882 : (_init_state < state);
3883 assert(good_state || state == allocated, "illegal state transition");
3884 #endif
3885 assert(_init_thread == NULL, "should be cleared before state change");
3886 _init_state = (u1)state;
3887 }
3888
3889 #if INCLUDE_JVMTI
3890
3891 // RedefineClasses() support for previous versions
3892
3893 // Globally, there is at least one previous version of a class to walk
3894 // during class unloading, which is saved because old methods in the class
3895 // are still running. Otherwise the previous version list is cleaned up.
3896 bool InstanceKlass::_has_previous_versions = false;
3897
3898 // Returns true if there are previous versions of a class for class
3899 // unloading only. Also resets the flag to false. purge_previous_version
3900 // will set the flag to true if there are any left, i.e., if there's any
3901 // work to do for next time. This is to avoid the expensive code cache
3902 // walk in CLDG::clean_deallocate_lists().
3903 bool InstanceKlass::has_previous_versions_and_reset() {
3904 bool ret = _has_previous_versions;
3905 log_trace(redefine, class, iklass, purge)("Class unloading: has_previous_versions = %s",
3906 ret ? "true" : "false");
3907 _has_previous_versions = false;
3908 return ret;
3909 }
3910
3911 // Purge previous versions before adding new previous versions of the class and
3912 // during class unloading.
3913 void InstanceKlass::purge_previous_version_list() {
3914 assert(SafepointSynchronize::is_at_safepoint(), "only called at safepoint");
3915 assert(has_been_redefined(), "Should only be called for main class");
3916
3917 // Quick exit.
3918 if (previous_versions() == NULL) {
3919 return;
3920 }
3921
3922 // This klass has previous versions so see what we can cleanup
3923 // while it is safe to do so.
3924
3925 int deleted_count = 0; // leave debugging breadcrumbs
3926 int live_count = 0;
3927 ClassLoaderData* loader_data = class_loader_data();
3928 assert(loader_data != NULL, "should never be null");
3929
3930 ResourceMark rm;
3931 log_trace(redefine, class, iklass, purge)("%s: previous versions", external_name());
3932
3933 // previous versions are linked together through the InstanceKlass
3934 InstanceKlass* pv_node = previous_versions();
3935 InstanceKlass* last = this;
3936 int version = 0;
3937
3938 // check the previous versions list
3939 for (; pv_node != NULL; ) {
3940
3941 ConstantPool* pvcp = pv_node->constants();
3942 assert(pvcp != NULL, "cp ref was unexpectedly cleared");
3943
3944 if (!pvcp->on_stack()) {
3945 // If the constant pool isn't on stack, none of the methods
3946 // are executing. Unlink this previous_version.
3947 // The previous version InstanceKlass is on the ClassLoaderData deallocate list
3948 // so will be deallocated during the next phase of class unloading.
3949 log_trace(redefine, class, iklass, purge)
3950 ("previous version " INTPTR_FORMAT " is dead.", p2i(pv_node));
3951 // For debugging purposes.
3952 pv_node->set_is_scratch_class();
3953 // Unlink from previous version list.
3954 assert(pv_node->class_loader_data() == loader_data, "wrong loader_data");
3955 InstanceKlass* next = pv_node->previous_versions();
3956 pv_node->link_previous_versions(NULL); // point next to NULL
3957 last->link_previous_versions(next);
3958 // Add to the deallocate list after unlinking
3959 loader_data->add_to_deallocate_list(pv_node);
3960 pv_node = next;
3961 deleted_count++;
3962 version++;
3963 continue;
3964 } else {
3965 log_trace(redefine, class, iklass, purge)("previous version " INTPTR_FORMAT " is alive", p2i(pv_node));
3966 assert(pvcp->pool_holder() != NULL, "Constant pool with no holder");
3967 guarantee (!loader_data->is_unloading(), "unloaded classes can't be on the stack");
3968 live_count++;
3969 // found a previous version for next time we do class unloading
3970 _has_previous_versions = true;
3971 }
3972
3973 // At least one method is live in this previous version.
3974 // Reset dead EMCP methods not to get breakpoints.
3975 // All methods are deallocated when all of the methods for this class are no
3976 // longer running.
3977 Array<Method*>* method_refs = pv_node->methods();
3978 if (method_refs != NULL) {
3979 log_trace(redefine, class, iklass, purge)("previous methods length=%d", method_refs->length());
3980 for (int j = 0; j < method_refs->length(); j++) {
3981 Method* method = method_refs->at(j);
3982
3983 if (!method->on_stack()) {
3984 // no breakpoints for non-running methods
3985 if (method->is_running_emcp()) {
3986 method->set_running_emcp(false);
3987 }
3988 } else {
3989 assert (method->is_obsolete() || method->is_running_emcp(),
3990 "emcp method cannot run after emcp bit is cleared");
3991 log_trace(redefine, class, iklass, purge)
3992 ("purge: %s(%s): prev method @%d in version @%d is alive",
3993 method->name()->as_C_string(), method->signature()->as_C_string(), j, version);
3994 }
3995 }
3996 }
3997 // next previous version
3998 last = pv_node;
3999 pv_node = pv_node->previous_versions();
4000 version++;
4001 }
4002 log_trace(redefine, class, iklass, purge)
4003 ("previous version stats: live=%d, deleted=%d", live_count, deleted_count);
4004 }
4005
4006 void InstanceKlass::mark_newly_obsolete_methods(Array<Method*>* old_methods,
4007 int emcp_method_count) {
4008 int obsolete_method_count = old_methods->length() - emcp_method_count;
4009
4010 if (emcp_method_count != 0 && obsolete_method_count != 0 &&
4011 _previous_versions != NULL) {
4012 // We have a mix of obsolete and EMCP methods so we have to
4013 // clear out any matching EMCP method entries the hard way.
4014 int local_count = 0;
4015 for (int i = 0; i < old_methods->length(); i++) {
4016 Method* old_method = old_methods->at(i);
4017 if (old_method->is_obsolete()) {
4018 // only obsolete methods are interesting
4019 Symbol* m_name = old_method->name();
4020 Symbol* m_signature = old_method->signature();
4021
4022 // previous versions are linked together through the InstanceKlass
4023 int j = 0;
4024 for (InstanceKlass* prev_version = _previous_versions;
4025 prev_version != NULL;
4026 prev_version = prev_version->previous_versions(), j++) {
4027
4028 Array<Method*>* method_refs = prev_version->methods();
4029 for (int k = 0; k < method_refs->length(); k++) {
4030 Method* method = method_refs->at(k);
4031
4032 if (!method->is_obsolete() &&
4033 method->name() == m_name &&
4034 method->signature() == m_signature) {
4035 // The current RedefineClasses() call has made all EMCP
4036 // versions of this method obsolete so mark it as obsolete
4037 log_trace(redefine, class, iklass, add)
4038 ("%s(%s): flush obsolete method @%d in version @%d",
4039 m_name->as_C_string(), m_signature->as_C_string(), k, j);
4040
4041 method->set_is_obsolete();
4042 break;
4043 }
4044 }
4045
4046 // The previous loop may not find a matching EMCP method, but
4047 // that doesn't mean that we can optimize and not go any
4048 // further back in the PreviousVersion generations. The EMCP
4049 // method for this generation could have already been made obsolete,
4050 // but there still may be an older EMCP method that has not
4051 // been made obsolete.
4052 }
4053
4054 if (++local_count >= obsolete_method_count) {
4055 // no more obsolete methods so bail out now
4056 break;
4057 }
4058 }
4059 }
4060 }
4061 }
4062
4063 // Save the scratch_class as the previous version if any of the methods are running.
4064 // The previous_versions are used to set breakpoints in EMCP methods and they are
4065 // also used to clean MethodData links to redefined methods that are no longer running.
4066 void InstanceKlass::add_previous_version(InstanceKlass* scratch_class,
4067 int emcp_method_count) {
4068 assert(Thread::current()->is_VM_thread(),
4069 "only VMThread can add previous versions");
4070
4071 ResourceMark rm;
4072 log_trace(redefine, class, iklass, add)
4073 ("adding previous version ref for %s, EMCP_cnt=%d", scratch_class->external_name(), emcp_method_count);
4074
4075 // Clean out old previous versions for this class
4076 purge_previous_version_list();
4077
4078 // Mark newly obsolete methods in remaining previous versions. An EMCP method from
4079 // a previous redefinition may be made obsolete by this redefinition.
4080 Array<Method*>* old_methods = scratch_class->methods();
4081 mark_newly_obsolete_methods(old_methods, emcp_method_count);
4082
4083 // If the constant pool for this previous version of the class
4084 // is not marked as being on the stack, then none of the methods
4085 // in this previous version of the class are on the stack so
4086 // we don't need to add this as a previous version.
4087 ConstantPool* cp_ref = scratch_class->constants();
4088 if (!cp_ref->on_stack()) {
4089 log_trace(redefine, class, iklass, add)("scratch class not added; no methods are running");
4090 // For debugging purposes.
4091 scratch_class->set_is_scratch_class();
4092 scratch_class->class_loader_data()->add_to_deallocate_list(scratch_class);
4093 return;
4094 }
4095
4096 if (emcp_method_count != 0) {
4097 // At least one method is still running, check for EMCP methods
4098 for (int i = 0; i < old_methods->length(); i++) {
4099 Method* old_method = old_methods->at(i);
4100 if (!old_method->is_obsolete() && old_method->on_stack()) {
4101 // if EMCP method (not obsolete) is on the stack, mark as EMCP so that
4102 // we can add breakpoints for it.
4103
4104 // We set the method->on_stack bit during safepoints for class redefinition
4105 // and use this bit to set the is_running_emcp bit.
4106 // After the safepoint, the on_stack bit is cleared and the running emcp
4107 // method may exit. If so, we would set a breakpoint in a method that
4108 // is never reached, but this won't be noticeable to the programmer.
4109 old_method->set_running_emcp(true);
4110 log_trace(redefine, class, iklass, add)
4111 ("EMCP method %s is on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
4112 } else if (!old_method->is_obsolete()) {
4113 log_trace(redefine, class, iklass, add)
4114 ("EMCP method %s is NOT on_stack " INTPTR_FORMAT, old_method->name_and_sig_as_C_string(), p2i(old_method));
4115 }
4116 }
4117 }
4118
4119 // Add previous version if any methods are still running.
4120 // Set has_previous_version flag for processing during class unloading.
4121 _has_previous_versions = true;
4122 log_trace(redefine, class, iklass, add) ("scratch class added; one of its methods is on_stack.");
4123 assert(scratch_class->previous_versions() == NULL, "shouldn't have a previous version");
4124 scratch_class->link_previous_versions(previous_versions());
4125 link_previous_versions(scratch_class);
4126 } // end add_previous_version()
4127
4128 #endif // INCLUDE_JVMTI
4129
4130 Method* InstanceKlass::method_with_idnum(int idnum) {
4131 Method* m = NULL;
4132 if (idnum < methods()->length()) {
4133 m = methods()->at(idnum);
4134 }
4135 if (m == NULL || m->method_idnum() != idnum) {
4136 for (int index = 0; index < methods()->length(); ++index) {
4137 m = methods()->at(index);
4138 if (m->method_idnum() == idnum) {
4139 return m;
4140 }
4141 }
4142 // None found, return null for the caller to handle.
4143 return NULL;
4144 }
4145 return m;
4146 }
4147
4148
4149 Method* InstanceKlass::method_with_orig_idnum(int idnum) {
4150 if (idnum >= methods()->length()) {
4151 return NULL;
4152 }
4153 Method* m = methods()->at(idnum);
4154 if (m != NULL && m->orig_method_idnum() == idnum) {
4155 return m;
4156 }
4157 // Obsolete method idnum does not match the original idnum
4158 for (int index = 0; index < methods()->length(); ++index) {
4159 m = methods()->at(index);
4160 if (m->orig_method_idnum() == idnum) {
4161 return m;
4162 }
4163 }
4164 // None found, return null for the caller to handle.
4165 return NULL;
4166 }
4167
4168
4169 Method* InstanceKlass::method_with_orig_idnum(int idnum, int version) {
4170 InstanceKlass* holder = get_klass_version(version);
4171 if (holder == NULL) {
4172 return NULL; // The version of klass is gone, no method is found
4173 }
4174 Method* method = holder->method_with_orig_idnum(idnum);
4175 return method;
4176 }
4177
4178 #if INCLUDE_JVMTI
4179 JvmtiCachedClassFileData* InstanceKlass::get_cached_class_file() {
4180 return _cached_class_file;
4181 }
4182
4183 jint InstanceKlass::get_cached_class_file_len() {
4184 return VM_RedefineClasses::get_cached_class_file_len(_cached_class_file);
4185 }
4186
4187 unsigned char * InstanceKlass::get_cached_class_file_bytes() {
4188 return VM_RedefineClasses::get_cached_class_file_bytes(_cached_class_file);
4189 }
4190 #endif
4191
4192 #define THROW_DVT_ERROR(s) \
4193 Exceptions::fthrow(THREAD_AND_LOCATION, vmSymbols::java_lang_IncompatibleClassChangeError(), \
4194 "ValueCapableClass class '%s' %s", external_name(),(s)); \
4195 return