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src/share/vm/oops/instanceRefKlass.cpp@190899198332
src/share/vm/oops/instanceRefKlass.cpp
Thu, 26 Sep 2013 10:25:02 -0400
- author
- hseigel
- date
- Thu, 26 Sep 2013 10:25:02 -0400
- changeset 5784
- 190899198332
- parent 4542
- db9981fd3124
- child 6680
- 78bbf4d43a14
- permissions
- -rw-r--r--
7195622: CheckUnhandledOops has limited usefulness now
Summary: Enable CHECK_UNHANDLED_OOPS in fastdebug builds across all supported platforms.
Reviewed-by: coleenp, hseigel, dholmes, stefank, twisti, ihse, rdurbin
Contributed-by: lois.foltan@oracle.com
1 /*
2 * Copyright (c) 1997, 2013, 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 */
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.hpp"
27 #include "classfile/systemDictionary.hpp"
28 #include "gc_implementation/shared/markSweep.inline.hpp"
29 #include "gc_interface/collectedHeap.hpp"
30 #include "gc_interface/collectedHeap.inline.hpp"
31 #include "memory/genCollectedHeap.hpp"
32 #include "memory/genOopClosures.inline.hpp"
33 #include "oops/instanceRefKlass.hpp"
34 #include "oops/oop.inline.hpp"
35 #include "utilities/preserveException.hpp"
36 #include "utilities/macros.hpp"
37 #if INCLUDE_ALL_GCS
38 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
39 #include "gc_implementation/g1/g1OopClosures.inline.hpp"
40 #include "gc_implementation/g1/g1RemSet.inline.hpp"
41 #include "gc_implementation/g1/heapRegionSeq.inline.hpp"
42 #include "gc_implementation/parNew/parOopClosures.inline.hpp"
43 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
44 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
45 #include "oops/oop.pcgc.inline.hpp"
46 #endif // INCLUDE_ALL_GCS
48 template <class T>
49 void specialized_oop_follow_contents(InstanceRefKlass* ref, oop obj) {
50 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
51 T heap_oop = oopDesc::load_heap_oop(referent_addr);
52 debug_only(
53 if(TraceReferenceGC && PrintGCDetails) {
54 gclog_or_tty->print_cr("InstanceRefKlass::oop_follow_contents " INTPTR_FORMAT, (void *)obj);
55 }
56 )
57 if (!oopDesc::is_null(heap_oop)) {
58 oop referent = oopDesc::decode_heap_oop_not_null(heap_oop);
59 if (!referent->is_gc_marked() &&
60 MarkSweep::ref_processor()->discover_reference(obj, ref->reference_type())) {
61 // reference was discovered, referent will be traversed later
62 ref->InstanceKlass::oop_follow_contents(obj);
63 debug_only(
64 if(TraceReferenceGC && PrintGCDetails) {
65 gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, (void *)obj);
66 }
67 )
68 return;
69 } else {
70 // treat referent as normal oop
71 debug_only(
72 if(TraceReferenceGC && PrintGCDetails) {
73 gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, (void *)obj);
74 }
75 )
76 MarkSweep::mark_and_push(referent_addr);
77 }
78 }
79 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
80 if (ReferenceProcessor::pending_list_uses_discovered_field()) {
81 // Treat discovered as normal oop, if ref is not "active",
82 // i.e. if next is non-NULL.
83 T next_oop = oopDesc::load_heap_oop(next_addr);
84 if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active"
85 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
86 debug_only(
87 if(TraceReferenceGC && PrintGCDetails) {
88 gclog_or_tty->print_cr(" Process discovered as normal "
89 INTPTR_FORMAT, discovered_addr);
90 }
91 )
92 MarkSweep::mark_and_push(discovered_addr);
93 }
94 } else {
95 #ifdef ASSERT
96 // In the case of older JDKs which do not use the discovered
97 // field for the pending list, an inactive ref (next != NULL)
98 // must always have a NULL discovered field.
99 oop next = oopDesc::load_decode_heap_oop(next_addr);
100 oop discovered = java_lang_ref_Reference::discovered(obj);
101 assert(oopDesc::is_null(next) || oopDesc::is_null(discovered),
102 err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field",
103 (oopDesc*)obj));
104 #endif
105 }
106 // treat next as normal oop. next is a link in the reference queue.
107 debug_only(
108 if(TraceReferenceGC && PrintGCDetails) {
109 gclog_or_tty->print_cr(" Process next as normal " INTPTR_FORMAT, next_addr);
110 }
111 )
112 MarkSweep::mark_and_push(next_addr);
113 ref->InstanceKlass::oop_follow_contents(obj);
114 }
116 void InstanceRefKlass::oop_follow_contents(oop obj) {
117 if (UseCompressedOops) {
118 specialized_oop_follow_contents<narrowOop>(this, obj);
119 } else {
120 specialized_oop_follow_contents<oop>(this, obj);
121 }
122 }
124 #if INCLUDE_ALL_GCS
125 template <class T>
126 void specialized_oop_follow_contents(InstanceRefKlass* ref,
127 ParCompactionManager* cm,
128 oop obj) {
129 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
130 T heap_oop = oopDesc::load_heap_oop(referent_addr);
131 debug_only(
132 if(TraceReferenceGC && PrintGCDetails) {
133 gclog_or_tty->print_cr("InstanceRefKlass::oop_follow_contents " INTPTR_FORMAT, (void *)obj);
134 }
135 )
136 if (!oopDesc::is_null(heap_oop)) {
137 oop referent = oopDesc::decode_heap_oop_not_null(heap_oop);
138 if (PSParallelCompact::mark_bitmap()->is_unmarked(referent) &&
139 PSParallelCompact::ref_processor()->
140 discover_reference(obj, ref->reference_type())) {
141 // reference already enqueued, referent will be traversed later
142 ref->InstanceKlass::oop_follow_contents(cm, obj);
143 debug_only(
144 if(TraceReferenceGC && PrintGCDetails) {
145 gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, (void *)obj);
146 }
147 )
148 return;
149 } else {
150 // treat referent as normal oop
151 debug_only(
152 if(TraceReferenceGC && PrintGCDetails) {
153 gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, (void *)obj);
154 }
155 )
156 PSParallelCompact::mark_and_push(cm, referent_addr);
157 }
158 }
159 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
160 if (ReferenceProcessor::pending_list_uses_discovered_field()) {
161 // Treat discovered as normal oop, if ref is not "active",
162 // i.e. if next is non-NULL.
163 T next_oop = oopDesc::load_heap_oop(next_addr);
164 if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active"
165 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
166 debug_only(
167 if(TraceReferenceGC && PrintGCDetails) {
168 gclog_or_tty->print_cr(" Process discovered as normal "
169 INTPTR_FORMAT, discovered_addr);
170 }
171 )
172 PSParallelCompact::mark_and_push(cm, discovered_addr);
173 }
174 } else {
175 #ifdef ASSERT
176 // In the case of older JDKs which do not use the discovered
177 // field for the pending list, an inactive ref (next != NULL)
178 // must always have a NULL discovered field.
179 T next = oopDesc::load_heap_oop(next_addr);
180 oop discovered = java_lang_ref_Reference::discovered(obj);
181 assert(oopDesc::is_null(next) || oopDesc::is_null(discovered),
182 err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field",
183 (oopDesc*)obj));
184 #endif
185 }
186 PSParallelCompact::mark_and_push(cm, next_addr);
187 ref->InstanceKlass::oop_follow_contents(cm, obj);
188 }
190 void InstanceRefKlass::oop_follow_contents(ParCompactionManager* cm,
191 oop obj) {
192 if (UseCompressedOops) {
193 specialized_oop_follow_contents<narrowOop>(this, cm, obj);
194 } else {
195 specialized_oop_follow_contents<oop>(this, cm, obj);
196 }
197 }
198 #endif // INCLUDE_ALL_GCS
200 #ifdef ASSERT
201 template <class T> void trace_reference_gc(const char *s, oop obj,
202 T* referent_addr,
203 T* next_addr,
204 T* discovered_addr) {
205 if(TraceReferenceGC && PrintGCDetails) {
206 gclog_or_tty->print_cr("%s obj " INTPTR_FORMAT, s, (address)obj);
207 gclog_or_tty->print_cr(" referent_addr/* " INTPTR_FORMAT " / "
208 INTPTR_FORMAT, referent_addr,
209 referent_addr ?
210 (address)oopDesc::load_decode_heap_oop(referent_addr) : NULL);
211 gclog_or_tty->print_cr(" next_addr/* " INTPTR_FORMAT " / "
212 INTPTR_FORMAT, next_addr,
213 next_addr ? (address)oopDesc::load_decode_heap_oop(next_addr) : NULL);
214 gclog_or_tty->print_cr(" discovered_addr/* " INTPTR_FORMAT " / "
215 INTPTR_FORMAT, discovered_addr,
216 discovered_addr ?
217 (address)oopDesc::load_decode_heap_oop(discovered_addr) : NULL);
218 }
219 }
220 #endif
222 template <class T> void specialized_oop_adjust_pointers(InstanceRefKlass *ref, oop obj) {
223 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
224 MarkSweep::adjust_pointer(referent_addr);
225 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
226 MarkSweep::adjust_pointer(next_addr);
227 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
228 MarkSweep::adjust_pointer(discovered_addr);
229 debug_only(trace_reference_gc("InstanceRefKlass::oop_adjust_pointers", obj,
230 referent_addr, next_addr, discovered_addr);)
231 }
233 int InstanceRefKlass::oop_adjust_pointers(oop obj) {
234 int size = size_helper();
235 InstanceKlass::oop_adjust_pointers(obj);
237 if (UseCompressedOops) {
238 specialized_oop_adjust_pointers<narrowOop>(this, obj);
239 } else {
240 specialized_oop_adjust_pointers<oop>(this, obj);
241 }
242 return size;
243 }
245 #define InstanceRefKlass_SPECIALIZED_OOP_ITERATE(T, nv_suffix, contains) \
246 T* disc_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); \
247 if (closure->apply_to_weak_ref_discovered_field()) { \
248 closure->do_oop##nv_suffix(disc_addr); \
249 } \
250 \
251 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); \
252 T heap_oop = oopDesc::load_heap_oop(referent_addr); \
253 ReferenceProcessor* rp = closure->_ref_processor; \
254 if (!oopDesc::is_null(heap_oop)) { \
255 oop referent = oopDesc::decode_heap_oop_not_null(heap_oop); \
256 if (!referent->is_gc_marked() && (rp != NULL) && \
257 rp->discover_reference(obj, reference_type())) { \
258 return size; \
259 } else if (contains(referent_addr)) { \
260 /* treat referent as normal oop */ \
261 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\
262 closure->do_oop##nv_suffix(referent_addr); \
263 } \
264 } \
265 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); \
266 if (ReferenceProcessor::pending_list_uses_discovered_field()) { \
267 T next_oop = oopDesc::load_heap_oop(next_addr); \
268 /* Treat discovered as normal oop, if ref is not "active" (next non-NULL) */\
269 if (!oopDesc::is_null(next_oop) && contains(disc_addr)) { \
270 /* i.e. ref is not "active" */ \
271 debug_only( \
272 if(TraceReferenceGC && PrintGCDetails) { \
273 gclog_or_tty->print_cr(" Process discovered as normal " \
274 INTPTR_FORMAT, disc_addr); \
275 } \
276 ) \
277 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\
278 closure->do_oop##nv_suffix(disc_addr); \
279 } \
280 } else { \
281 /* In the case of older JDKs which do not use the discovered field for */ \
282 /* the pending list, an inactive ref (next != NULL) must always have a */ \
283 /* NULL discovered field. */ \
284 debug_only( \
285 T next_oop = oopDesc::load_heap_oop(next_addr); \
286 T disc_oop = oopDesc::load_heap_oop(disc_addr); \
287 assert(oopDesc::is_null(next_oop) || oopDesc::is_null(disc_oop), \
288 err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL" \
289 "discovered field", (oopDesc*)obj)); \
290 ) \
291 } \
292 /* treat next as normal oop */ \
293 if (contains(next_addr)) { \
294 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk); \
295 closure->do_oop##nv_suffix(next_addr); \
296 } \
297 return size; \
300 template <class T> bool contains(T *t) { return true; }
302 // Macro to define InstanceRefKlass::oop_oop_iterate for virtual/nonvirtual for
303 // all closures. Macros calling macros above for each oop size.
305 #define InstanceRefKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \
306 \
307 int InstanceRefKlass:: \
308 oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \
309 /* Get size before changing pointers */ \
310 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
311 \
312 int size = InstanceKlass::oop_oop_iterate##nv_suffix(obj, closure); \
313 \
314 if (UseCompressedOops) { \
315 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, contains); \
316 } else { \
317 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, contains); \
318 } \
319 }
321 #if INCLUDE_ALL_GCS
322 #define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \
323 \
324 int InstanceRefKlass:: \
325 oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure) { \
326 /* Get size before changing pointers */ \
327 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
328 \
329 int size = InstanceKlass::oop_oop_iterate_backwards##nv_suffix(obj, closure); \
330 \
331 if (UseCompressedOops) { \
332 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, contains); \
333 } else { \
334 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, contains); \
335 } \
336 }
337 #endif // INCLUDE_ALL_GCS
340 #define InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \
341 \
342 int InstanceRefKlass:: \
343 oop_oop_iterate##nv_suffix##_m(oop obj, \
344 OopClosureType* closure, \
345 MemRegion mr) { \
346 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
347 \
348 int size = InstanceKlass::oop_oop_iterate##nv_suffix##_m(obj, closure, mr); \
349 if (UseCompressedOops) { \
350 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, mr.contains); \
351 } else { \
352 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, mr.contains); \
353 } \
354 }
356 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN)
357 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN)
358 #if INCLUDE_ALL_GCS
359 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
360 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
361 #endif // INCLUDE_ALL_GCS
362 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m)
363 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m)
365 #if INCLUDE_ALL_GCS
366 template <class T>
367 void specialized_oop_push_contents(InstanceRefKlass *ref,
368 PSPromotionManager* pm, oop obj) {
369 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
370 if (PSScavenge::should_scavenge(referent_addr)) {
371 ReferenceProcessor* rp = PSScavenge::reference_processor();
372 if (rp->discover_reference(obj, ref->reference_type())) {
373 // reference already enqueued, referent and next will be traversed later
374 ref->InstanceKlass::oop_push_contents(pm, obj);
375 return;
376 } else {
377 // treat referent as normal oop
378 pm->claim_or_forward_depth(referent_addr);
379 }
380 }
381 // Treat discovered as normal oop, if ref is not "active",
382 // i.e. if next is non-NULL.
383 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
384 if (ReferenceProcessor::pending_list_uses_discovered_field()) {
385 T next_oop = oopDesc::load_heap_oop(next_addr);
386 if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active"
387 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
388 debug_only(
389 if(TraceReferenceGC && PrintGCDetails) {
390 gclog_or_tty->print_cr(" Process discovered as normal "
391 INTPTR_FORMAT, discovered_addr);
392 }
393 )
394 if (PSScavenge::should_scavenge(discovered_addr)) {
395 pm->claim_or_forward_depth(discovered_addr);
396 }
397 }
398 } else {
399 #ifdef ASSERT
400 // In the case of older JDKs which do not use the discovered
401 // field for the pending list, an inactive ref (next != NULL)
402 // must always have a NULL discovered field.
403 oop next = oopDesc::load_decode_heap_oop(next_addr);
404 oop discovered = java_lang_ref_Reference::discovered(obj);
405 assert(oopDesc::is_null(next) || oopDesc::is_null(discovered),
406 err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field",
407 (oopDesc*)obj));
408 #endif
409 }
411 // Treat next as normal oop; next is a link in the reference queue.
412 if (PSScavenge::should_scavenge(next_addr)) {
413 pm->claim_or_forward_depth(next_addr);
414 }
415 ref->InstanceKlass::oop_push_contents(pm, obj);
416 }
418 void InstanceRefKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
419 if (UseCompressedOops) {
420 specialized_oop_push_contents<narrowOop>(this, pm, obj);
421 } else {
422 specialized_oop_push_contents<oop>(this, pm, obj);
423 }
424 }
426 template <class T>
427 void specialized_oop_update_pointers(InstanceRefKlass *ref,
428 ParCompactionManager* cm, oop obj) {
429 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
430 PSParallelCompact::adjust_pointer(referent_addr);
431 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
432 PSParallelCompact::adjust_pointer(next_addr);
433 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
434 PSParallelCompact::adjust_pointer(discovered_addr);
435 debug_only(trace_reference_gc("InstanceRefKlass::oop_update_ptrs", obj,
436 referent_addr, next_addr, discovered_addr);)
437 }
439 int InstanceRefKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
440 InstanceKlass::oop_update_pointers(cm, obj);
441 if (UseCompressedOops) {
442 specialized_oop_update_pointers<narrowOop>(this, cm, obj);
443 } else {
444 specialized_oop_update_pointers<oop>(this, cm, obj);
445 }
446 return size_helper();
447 }
448 #endif // INCLUDE_ALL_GCS
450 void InstanceRefKlass::update_nonstatic_oop_maps(Klass* k) {
451 // Clear the nonstatic oop-map entries corresponding to referent
452 // and nextPending field. They are treated specially by the
453 // garbage collector.
454 // The discovered field is used only by the garbage collector
455 // and is also treated specially.
456 InstanceKlass* ik = InstanceKlass::cast(k);
458 // Check that we have the right class
459 debug_only(static bool first_time = true);
460 assert(k == SystemDictionary::Reference_klass() && first_time,
461 "Invalid update of maps");
462 debug_only(first_time = false);
463 assert(ik->nonstatic_oop_map_count() == 1, "just checking");
465 OopMapBlock* map = ik->start_of_nonstatic_oop_maps();
467 // Check that the current map is (2,4) - currently points at field with
468 // offset 2 (words) and has 4 map entries.
469 debug_only(int offset = java_lang_ref_Reference::referent_offset);
470 debug_only(unsigned int count = ((java_lang_ref_Reference::discovered_offset -
471 java_lang_ref_Reference::referent_offset)/heapOopSize) + 1);
473 if (UseSharedSpaces) {
474 assert(map->offset() == java_lang_ref_Reference::queue_offset &&
475 map->count() == 1, "just checking");
476 } else {
477 assert(map->offset() == offset && map->count() == count,
478 "just checking");
480 // Update map to (3,1) - point to offset of 3 (words) with 1 map entry.
481 map->set_offset(java_lang_ref_Reference::queue_offset);
482 map->set_count(1);
483 }
484 }
487 // Verification
489 void InstanceRefKlass::oop_verify_on(oop obj, outputStream* st) {
490 InstanceKlass::oop_verify_on(obj, st);
491 // Verify referent field
492 oop referent = java_lang_ref_Reference::referent(obj);
494 // We should make this general to all heaps
495 GenCollectedHeap* gch = NULL;
496 if (Universe::heap()->kind() == CollectedHeap::GenCollectedHeap)
497 gch = GenCollectedHeap::heap();
499 if (referent != NULL) {
500 guarantee(referent->is_oop(), "referent field heap failed");
501 }
502 // Verify next field
503 oop next = java_lang_ref_Reference::next(obj);
504 if (next != NULL) {
505 guarantee(next->is_oop(), "next field verify failed");
506 guarantee(next->is_instanceRef(), "next field verify failed");
507 }
508 }
510 bool InstanceRefKlass::owns_pending_list_lock(JavaThread* thread) {
511 if (java_lang_ref_Reference::pending_list_lock() == NULL) return false;
512 Handle h_lock(thread, java_lang_ref_Reference::pending_list_lock());
513 return ObjectSynchronizer::current_thread_holds_lock(thread, h_lock);
514 }
516 void InstanceRefKlass::acquire_pending_list_lock(BasicLock *pending_list_basic_lock) {
517 // we may enter this with pending exception set
518 PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument
520 // Create a HandleMark in case we retry a GC multiple times.
521 // Each time we attempt the GC, we allocate the handle below
522 // to hold the pending list lock. We want to free this handle.
523 HandleMark hm;
525 Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock());
526 ObjectSynchronizer::fast_enter(h_lock, pending_list_basic_lock, false, THREAD);
527 assert(ObjectSynchronizer::current_thread_holds_lock(
528 JavaThread::current(), h_lock),
529 "Locking should have succeeded");
530 if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION;
531 }
533 void InstanceRefKlass::release_and_notify_pending_list_lock(
534 BasicLock *pending_list_basic_lock) {
535 // we may enter this with pending exception set
536 PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument
538 // Create a HandleMark in case we retry a GC multiple times.
539 // Each time we attempt the GC, we allocate the handle below
540 // to hold the pending list lock. We want to free this handle.
541 HandleMark hm;
543 Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock());
544 assert(ObjectSynchronizer::current_thread_holds_lock(
545 JavaThread::current(), h_lock),
546 "Lock should be held");
547 // Notify waiters on pending lists lock if there is any reference.
548 if (java_lang_ref_Reference::pending_list() != NULL) {
549 ObjectSynchronizer::notifyall(h_lock, THREAD);
550 }
551 ObjectSynchronizer::fast_exit(h_lock(), pending_list_basic_lock, THREAD);
552 if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION;
553 }
