1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/oops/instanceRefKlass.cpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,555 @@
1.4 +/*
1.5 + * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#include "precompiled.hpp"
1.29 +#include "classfile/javaClasses.hpp"
1.30 +#include "classfile/systemDictionary.hpp"
1.31 +#include "gc_implementation/shared/markSweep.inline.hpp"
1.32 +#include "gc_interface/collectedHeap.hpp"
1.33 +#include "gc_interface/collectedHeap.inline.hpp"
1.34 +#include "memory/genCollectedHeap.hpp"
1.35 +#include "memory/genOopClosures.inline.hpp"
1.36 +#include "oops/instanceRefKlass.hpp"
1.37 +#include "oops/oop.inline.hpp"
1.38 +#include "utilities/preserveException.hpp"
1.39 +#include "utilities/macros.hpp"
1.40 +#if INCLUDE_ALL_GCS
1.41 +#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
1.42 +#include "gc_implementation/g1/g1OopClosures.inline.hpp"
1.43 +#include "gc_implementation/g1/g1RemSet.inline.hpp"
1.44 +#include "gc_implementation/g1/heapRegionSeq.inline.hpp"
1.45 +#include "gc_implementation/parNew/parOopClosures.inline.hpp"
1.46 +#include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
1.47 +#include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
1.48 +#include "oops/oop.pcgc.inline.hpp"
1.49 +#endif // INCLUDE_ALL_GCS
1.50 +
1.51 +PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
1.52 +
1.53 +template <class T>
1.54 +void specialized_oop_follow_contents(InstanceRefKlass* ref, oop obj) {
1.55 + T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
1.56 + T heap_oop = oopDesc::load_heap_oop(referent_addr);
1.57 + debug_only(
1.58 + if(TraceReferenceGC && PrintGCDetails) {
1.59 + gclog_or_tty->print_cr("InstanceRefKlass::oop_follow_contents " INTPTR_FORMAT, (void *)obj);
1.60 + }
1.61 + )
1.62 + if (!oopDesc::is_null(heap_oop)) {
1.63 + oop referent = oopDesc::decode_heap_oop_not_null(heap_oop);
1.64 + if (!referent->is_gc_marked() &&
1.65 + MarkSweep::ref_processor()->discover_reference(obj, ref->reference_type())) {
1.66 + // reference was discovered, referent will be traversed later
1.67 + ref->InstanceKlass::oop_follow_contents(obj);
1.68 + debug_only(
1.69 + if(TraceReferenceGC && PrintGCDetails) {
1.70 + gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, (void *)obj);
1.71 + }
1.72 + )
1.73 + return;
1.74 + } else {
1.75 + // treat referent as normal oop
1.76 + debug_only(
1.77 + if(TraceReferenceGC && PrintGCDetails) {
1.78 + gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, (void *)obj);
1.79 + }
1.80 + )
1.81 + MarkSweep::mark_and_push(referent_addr);
1.82 + }
1.83 + }
1.84 + T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
1.85 + if (ReferenceProcessor::pending_list_uses_discovered_field()) {
1.86 + // Treat discovered as normal oop, if ref is not "active",
1.87 + // i.e. if next is non-NULL.
1.88 + T next_oop = oopDesc::load_heap_oop(next_addr);
1.89 + if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active"
1.90 + T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
1.91 + debug_only(
1.92 + if(TraceReferenceGC && PrintGCDetails) {
1.93 + gclog_or_tty->print_cr(" Process discovered as normal "
1.94 + INTPTR_FORMAT, discovered_addr);
1.95 + }
1.96 + )
1.97 + MarkSweep::mark_and_push(discovered_addr);
1.98 + }
1.99 + } else {
1.100 +#ifdef ASSERT
1.101 + // In the case of older JDKs which do not use the discovered
1.102 + // field for the pending list, an inactive ref (next != NULL)
1.103 + // must always have a NULL discovered field.
1.104 + oop next = oopDesc::load_decode_heap_oop(next_addr);
1.105 + oop discovered = java_lang_ref_Reference::discovered(obj);
1.106 + assert(oopDesc::is_null(next) || oopDesc::is_null(discovered),
1.107 + err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field",
1.108 + (oopDesc*)obj));
1.109 +#endif
1.110 + }
1.111 + // treat next as normal oop. next is a link in the reference queue.
1.112 + debug_only(
1.113 + if(TraceReferenceGC && PrintGCDetails) {
1.114 + gclog_or_tty->print_cr(" Process next as normal " INTPTR_FORMAT, next_addr);
1.115 + }
1.116 + )
1.117 + MarkSweep::mark_and_push(next_addr);
1.118 + ref->InstanceKlass::oop_follow_contents(obj);
1.119 +}
1.120 +
1.121 +void InstanceRefKlass::oop_follow_contents(oop obj) {
1.122 + if (UseCompressedOops) {
1.123 + specialized_oop_follow_contents<narrowOop>(this, obj);
1.124 + } else {
1.125 + specialized_oop_follow_contents<oop>(this, obj);
1.126 + }
1.127 +}
1.128 +
1.129 +#if INCLUDE_ALL_GCS
1.130 +template <class T>
1.131 +void specialized_oop_follow_contents(InstanceRefKlass* ref,
1.132 + ParCompactionManager* cm,
1.133 + oop obj) {
1.134 + T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
1.135 + T heap_oop = oopDesc::load_heap_oop(referent_addr);
1.136 + debug_only(
1.137 + if(TraceReferenceGC && PrintGCDetails) {
1.138 + gclog_or_tty->print_cr("InstanceRefKlass::oop_follow_contents " INTPTR_FORMAT, (void *)obj);
1.139 + }
1.140 + )
1.141 + if (!oopDesc::is_null(heap_oop)) {
1.142 + oop referent = oopDesc::decode_heap_oop_not_null(heap_oop);
1.143 + if (PSParallelCompact::mark_bitmap()->is_unmarked(referent) &&
1.144 + PSParallelCompact::ref_processor()->
1.145 + discover_reference(obj, ref->reference_type())) {
1.146 + // reference already enqueued, referent will be traversed later
1.147 + ref->InstanceKlass::oop_follow_contents(cm, obj);
1.148 + debug_only(
1.149 + if(TraceReferenceGC && PrintGCDetails) {
1.150 + gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, (void *)obj);
1.151 + }
1.152 + )
1.153 + return;
1.154 + } else {
1.155 + // treat referent as normal oop
1.156 + debug_only(
1.157 + if(TraceReferenceGC && PrintGCDetails) {
1.158 + gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, (void *)obj);
1.159 + }
1.160 + )
1.161 + PSParallelCompact::mark_and_push(cm, referent_addr);
1.162 + }
1.163 + }
1.164 + T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
1.165 + if (ReferenceProcessor::pending_list_uses_discovered_field()) {
1.166 + // Treat discovered as normal oop, if ref is not "active",
1.167 + // i.e. if next is non-NULL.
1.168 + T next_oop = oopDesc::load_heap_oop(next_addr);
1.169 + if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active"
1.170 + T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
1.171 + debug_only(
1.172 + if(TraceReferenceGC && PrintGCDetails) {
1.173 + gclog_or_tty->print_cr(" Process discovered as normal "
1.174 + INTPTR_FORMAT, discovered_addr);
1.175 + }
1.176 + )
1.177 + PSParallelCompact::mark_and_push(cm, discovered_addr);
1.178 + }
1.179 + } else {
1.180 +#ifdef ASSERT
1.181 + // In the case of older JDKs which do not use the discovered
1.182 + // field for the pending list, an inactive ref (next != NULL)
1.183 + // must always have a NULL discovered field.
1.184 + T next = oopDesc::load_heap_oop(next_addr);
1.185 + oop discovered = java_lang_ref_Reference::discovered(obj);
1.186 + assert(oopDesc::is_null(next) || oopDesc::is_null(discovered),
1.187 + err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field",
1.188 + (oopDesc*)obj));
1.189 +#endif
1.190 + }
1.191 + PSParallelCompact::mark_and_push(cm, next_addr);
1.192 + ref->InstanceKlass::oop_follow_contents(cm, obj);
1.193 +}
1.194 +
1.195 +void InstanceRefKlass::oop_follow_contents(ParCompactionManager* cm,
1.196 + oop obj) {
1.197 + if (UseCompressedOops) {
1.198 + specialized_oop_follow_contents<narrowOop>(this, cm, obj);
1.199 + } else {
1.200 + specialized_oop_follow_contents<oop>(this, cm, obj);
1.201 + }
1.202 +}
1.203 +#endif // INCLUDE_ALL_GCS
1.204 +
1.205 +#ifdef ASSERT
1.206 +template <class T> void trace_reference_gc(const char *s, oop obj,
1.207 + T* referent_addr,
1.208 + T* next_addr,
1.209 + T* discovered_addr) {
1.210 + if(TraceReferenceGC && PrintGCDetails) {
1.211 + gclog_or_tty->print_cr("%s obj " INTPTR_FORMAT, s, (address)obj);
1.212 + gclog_or_tty->print_cr(" referent_addr/* " INTPTR_FORMAT " / "
1.213 + INTPTR_FORMAT, referent_addr,
1.214 + referent_addr ?
1.215 + (address)oopDesc::load_decode_heap_oop(referent_addr) : NULL);
1.216 + gclog_or_tty->print_cr(" next_addr/* " INTPTR_FORMAT " / "
1.217 + INTPTR_FORMAT, next_addr,
1.218 + next_addr ? (address)oopDesc::load_decode_heap_oop(next_addr) : NULL);
1.219 + gclog_or_tty->print_cr(" discovered_addr/* " INTPTR_FORMAT " / "
1.220 + INTPTR_FORMAT, discovered_addr,
1.221 + discovered_addr ?
1.222 + (address)oopDesc::load_decode_heap_oop(discovered_addr) : NULL);
1.223 + }
1.224 +}
1.225 +#endif
1.226 +
1.227 +template <class T> void specialized_oop_adjust_pointers(InstanceRefKlass *ref, oop obj) {
1.228 + T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
1.229 + MarkSweep::adjust_pointer(referent_addr);
1.230 + T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
1.231 + MarkSweep::adjust_pointer(next_addr);
1.232 + T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
1.233 + MarkSweep::adjust_pointer(discovered_addr);
1.234 + debug_only(trace_reference_gc("InstanceRefKlass::oop_adjust_pointers", obj,
1.235 + referent_addr, next_addr, discovered_addr);)
1.236 +}
1.237 +
1.238 +int InstanceRefKlass::oop_adjust_pointers(oop obj) {
1.239 + int size = size_helper();
1.240 + InstanceKlass::oop_adjust_pointers(obj);
1.241 +
1.242 + if (UseCompressedOops) {
1.243 + specialized_oop_adjust_pointers<narrowOop>(this, obj);
1.244 + } else {
1.245 + specialized_oop_adjust_pointers<oop>(this, obj);
1.246 + }
1.247 + return size;
1.248 +}
1.249 +
1.250 +#define InstanceRefKlass_SPECIALIZED_OOP_ITERATE(T, nv_suffix, contains) \
1.251 + T* disc_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); \
1.252 + if (closure->apply_to_weak_ref_discovered_field()) { \
1.253 + closure->do_oop##nv_suffix(disc_addr); \
1.254 + } \
1.255 + \
1.256 + T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); \
1.257 + T heap_oop = oopDesc::load_heap_oop(referent_addr); \
1.258 + ReferenceProcessor* rp = closure->_ref_processor; \
1.259 + if (!oopDesc::is_null(heap_oop)) { \
1.260 + oop referent = oopDesc::decode_heap_oop_not_null(heap_oop); \
1.261 + if (!referent->is_gc_marked() && (rp != NULL) && \
1.262 + rp->discover_reference(obj, reference_type())) { \
1.263 + return size; \
1.264 + } else if (contains(referent_addr)) { \
1.265 + /* treat referent as normal oop */ \
1.266 + SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\
1.267 + closure->do_oop##nv_suffix(referent_addr); \
1.268 + } \
1.269 + } \
1.270 + T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); \
1.271 + if (ReferenceProcessor::pending_list_uses_discovered_field()) { \
1.272 + T next_oop = oopDesc::load_heap_oop(next_addr); \
1.273 + /* Treat discovered as normal oop, if ref is not "active" (next non-NULL) */\
1.274 + if (!oopDesc::is_null(next_oop) && contains(disc_addr)) { \
1.275 + /* i.e. ref is not "active" */ \
1.276 + debug_only( \
1.277 + if(TraceReferenceGC && PrintGCDetails) { \
1.278 + gclog_or_tty->print_cr(" Process discovered as normal " \
1.279 + INTPTR_FORMAT, disc_addr); \
1.280 + } \
1.281 + ) \
1.282 + SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\
1.283 + closure->do_oop##nv_suffix(disc_addr); \
1.284 + } \
1.285 + } else { \
1.286 + /* In the case of older JDKs which do not use the discovered field for */ \
1.287 + /* the pending list, an inactive ref (next != NULL) must always have a */ \
1.288 + /* NULL discovered field. */ \
1.289 + debug_only( \
1.290 + T next_oop = oopDesc::load_heap_oop(next_addr); \
1.291 + T disc_oop = oopDesc::load_heap_oop(disc_addr); \
1.292 + assert(oopDesc::is_null(next_oop) || oopDesc::is_null(disc_oop), \
1.293 + err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL" \
1.294 + "discovered field", (oopDesc*)obj)); \
1.295 + ) \
1.296 + } \
1.297 + /* treat next as normal oop */ \
1.298 + if (contains(next_addr)) { \
1.299 + SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk); \
1.300 + closure->do_oop##nv_suffix(next_addr); \
1.301 + } \
1.302 + return size; \
1.303 +
1.304 +
1.305 +template <class T> bool contains(T *t) { return true; }
1.306 +
1.307 +// Macro to define InstanceRefKlass::oop_oop_iterate for virtual/nonvirtual for
1.308 +// all closures. Macros calling macros above for each oop size.
1.309 +
1.310 +#define InstanceRefKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \
1.311 + \
1.312 +int InstanceRefKlass:: \
1.313 +oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \
1.314 + /* Get size before changing pointers */ \
1.315 + SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
1.316 + \
1.317 + int size = InstanceKlass::oop_oop_iterate##nv_suffix(obj, closure); \
1.318 + \
1.319 + if (UseCompressedOops) { \
1.320 + InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, contains); \
1.321 + } else { \
1.322 + InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, contains); \
1.323 + } \
1.324 +}
1.325 +
1.326 +#if INCLUDE_ALL_GCS
1.327 +#define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \
1.328 + \
1.329 +int InstanceRefKlass:: \
1.330 +oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure) { \
1.331 + /* Get size before changing pointers */ \
1.332 + SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
1.333 + \
1.334 + int size = InstanceKlass::oop_oop_iterate_backwards##nv_suffix(obj, closure); \
1.335 + \
1.336 + if (UseCompressedOops) { \
1.337 + InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, contains); \
1.338 + } else { \
1.339 + InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, contains); \
1.340 + } \
1.341 +}
1.342 +#endif // INCLUDE_ALL_GCS
1.343 +
1.344 +
1.345 +#define InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \
1.346 + \
1.347 +int InstanceRefKlass:: \
1.348 +oop_oop_iterate##nv_suffix##_m(oop obj, \
1.349 + OopClosureType* closure, \
1.350 + MemRegion mr) { \
1.351 + SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
1.352 + \
1.353 + int size = InstanceKlass::oop_oop_iterate##nv_suffix##_m(obj, closure, mr); \
1.354 + if (UseCompressedOops) { \
1.355 + InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, mr.contains); \
1.356 + } else { \
1.357 + InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, mr.contains); \
1.358 + } \
1.359 +}
1.360 +
1.361 +ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN)
1.362 +ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN)
1.363 +#if INCLUDE_ALL_GCS
1.364 +ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
1.365 +ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
1.366 +#endif // INCLUDE_ALL_GCS
1.367 +ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m)
1.368 +ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m)
1.369 +
1.370 +#if INCLUDE_ALL_GCS
1.371 +template <class T>
1.372 +void specialized_oop_push_contents(InstanceRefKlass *ref,
1.373 + PSPromotionManager* pm, oop obj) {
1.374 + T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
1.375 + if (PSScavenge::should_scavenge(referent_addr)) {
1.376 + ReferenceProcessor* rp = PSScavenge::reference_processor();
1.377 + if (rp->discover_reference(obj, ref->reference_type())) {
1.378 + // reference already enqueued, referent and next will be traversed later
1.379 + ref->InstanceKlass::oop_push_contents(pm, obj);
1.380 + return;
1.381 + } else {
1.382 + // treat referent as normal oop
1.383 + pm->claim_or_forward_depth(referent_addr);
1.384 + }
1.385 + }
1.386 + // Treat discovered as normal oop, if ref is not "active",
1.387 + // i.e. if next is non-NULL.
1.388 + T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
1.389 + if (ReferenceProcessor::pending_list_uses_discovered_field()) {
1.390 + T next_oop = oopDesc::load_heap_oop(next_addr);
1.391 + if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active"
1.392 + T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
1.393 + debug_only(
1.394 + if(TraceReferenceGC && PrintGCDetails) {
1.395 + gclog_or_tty->print_cr(" Process discovered as normal "
1.396 + INTPTR_FORMAT, discovered_addr);
1.397 + }
1.398 + )
1.399 + if (PSScavenge::should_scavenge(discovered_addr)) {
1.400 + pm->claim_or_forward_depth(discovered_addr);
1.401 + }
1.402 + }
1.403 + } else {
1.404 +#ifdef ASSERT
1.405 + // In the case of older JDKs which do not use the discovered
1.406 + // field for the pending list, an inactive ref (next != NULL)
1.407 + // must always have a NULL discovered field.
1.408 + oop next = oopDesc::load_decode_heap_oop(next_addr);
1.409 + oop discovered = java_lang_ref_Reference::discovered(obj);
1.410 + assert(oopDesc::is_null(next) || oopDesc::is_null(discovered),
1.411 + err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field",
1.412 + (oopDesc*)obj));
1.413 +#endif
1.414 + }
1.415 +
1.416 + // Treat next as normal oop; next is a link in the reference queue.
1.417 + if (PSScavenge::should_scavenge(next_addr)) {
1.418 + pm->claim_or_forward_depth(next_addr);
1.419 + }
1.420 + ref->InstanceKlass::oop_push_contents(pm, obj);
1.421 +}
1.422 +
1.423 +void InstanceRefKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
1.424 + if (UseCompressedOops) {
1.425 + specialized_oop_push_contents<narrowOop>(this, pm, obj);
1.426 + } else {
1.427 + specialized_oop_push_contents<oop>(this, pm, obj);
1.428 + }
1.429 +}
1.430 +
1.431 +template <class T>
1.432 +void specialized_oop_update_pointers(InstanceRefKlass *ref,
1.433 + ParCompactionManager* cm, oop obj) {
1.434 + T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
1.435 + PSParallelCompact::adjust_pointer(referent_addr);
1.436 + T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
1.437 + PSParallelCompact::adjust_pointer(next_addr);
1.438 + T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
1.439 + PSParallelCompact::adjust_pointer(discovered_addr);
1.440 + debug_only(trace_reference_gc("InstanceRefKlass::oop_update_ptrs", obj,
1.441 + referent_addr, next_addr, discovered_addr);)
1.442 +}
1.443 +
1.444 +int InstanceRefKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
1.445 + InstanceKlass::oop_update_pointers(cm, obj);
1.446 + if (UseCompressedOops) {
1.447 + specialized_oop_update_pointers<narrowOop>(this, cm, obj);
1.448 + } else {
1.449 + specialized_oop_update_pointers<oop>(this, cm, obj);
1.450 + }
1.451 + return size_helper();
1.452 +}
1.453 +#endif // INCLUDE_ALL_GCS
1.454 +
1.455 +void InstanceRefKlass::update_nonstatic_oop_maps(Klass* k) {
1.456 + // Clear the nonstatic oop-map entries corresponding to referent
1.457 + // and nextPending field. They are treated specially by the
1.458 + // garbage collector.
1.459 + // The discovered field is used only by the garbage collector
1.460 + // and is also treated specially.
1.461 + InstanceKlass* ik = InstanceKlass::cast(k);
1.462 +
1.463 + // Check that we have the right class
1.464 + debug_only(static bool first_time = true);
1.465 + assert(k == SystemDictionary::Reference_klass() && first_time,
1.466 + "Invalid update of maps");
1.467 + debug_only(first_time = false);
1.468 + assert(ik->nonstatic_oop_map_count() == 1, "just checking");
1.469 +
1.470 + OopMapBlock* map = ik->start_of_nonstatic_oop_maps();
1.471 +
1.472 + // Check that the current map is (2,4) - currently points at field with
1.473 + // offset 2 (words) and has 4 map entries.
1.474 + debug_only(int offset = java_lang_ref_Reference::referent_offset);
1.475 + debug_only(unsigned int count = ((java_lang_ref_Reference::discovered_offset -
1.476 + java_lang_ref_Reference::referent_offset)/heapOopSize) + 1);
1.477 +
1.478 + if (UseSharedSpaces) {
1.479 + assert(map->offset() == java_lang_ref_Reference::queue_offset &&
1.480 + map->count() == 1, "just checking");
1.481 + } else {
1.482 + assert(map->offset() == offset && map->count() == count,
1.483 + "just checking");
1.484 +
1.485 + // Update map to (3,1) - point to offset of 3 (words) with 1 map entry.
1.486 + map->set_offset(java_lang_ref_Reference::queue_offset);
1.487 + map->set_count(1);
1.488 + }
1.489 +}
1.490 +
1.491 +
1.492 +// Verification
1.493 +
1.494 +void InstanceRefKlass::oop_verify_on(oop obj, outputStream* st) {
1.495 + InstanceKlass::oop_verify_on(obj, st);
1.496 + // Verify referent field
1.497 + oop referent = java_lang_ref_Reference::referent(obj);
1.498 +
1.499 + // We should make this general to all heaps
1.500 + GenCollectedHeap* gch = NULL;
1.501 + if (Universe::heap()->kind() == CollectedHeap::GenCollectedHeap)
1.502 + gch = GenCollectedHeap::heap();
1.503 +
1.504 + if (referent != NULL) {
1.505 + guarantee(referent->is_oop(), "referent field heap failed");
1.506 + }
1.507 + // Verify next field
1.508 + oop next = java_lang_ref_Reference::next(obj);
1.509 + if (next != NULL) {
1.510 + guarantee(next->is_oop(), "next field verify failed");
1.511 + guarantee(next->is_instanceRef(), "next field verify failed");
1.512 + }
1.513 +}
1.514 +
1.515 +bool InstanceRefKlass::owns_pending_list_lock(JavaThread* thread) {
1.516 + if (java_lang_ref_Reference::pending_list_lock() == NULL) return false;
1.517 + Handle h_lock(thread, java_lang_ref_Reference::pending_list_lock());
1.518 + return ObjectSynchronizer::current_thread_holds_lock(thread, h_lock);
1.519 +}
1.520 +
1.521 +void InstanceRefKlass::acquire_pending_list_lock(BasicLock *pending_list_basic_lock) {
1.522 + // we may enter this with pending exception set
1.523 + PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument
1.524 +
1.525 + // Create a HandleMark in case we retry a GC multiple times.
1.526 + // Each time we attempt the GC, we allocate the handle below
1.527 + // to hold the pending list lock. We want to free this handle.
1.528 + HandleMark hm;
1.529 +
1.530 + Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock());
1.531 + ObjectSynchronizer::fast_enter(h_lock, pending_list_basic_lock, false, THREAD);
1.532 + assert(ObjectSynchronizer::current_thread_holds_lock(
1.533 + JavaThread::current(), h_lock),
1.534 + "Locking should have succeeded");
1.535 + if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION;
1.536 +}
1.537 +
1.538 +void InstanceRefKlass::release_and_notify_pending_list_lock(
1.539 + BasicLock *pending_list_basic_lock) {
1.540 + // we may enter this with pending exception set
1.541 + PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument
1.542 +
1.543 + // Create a HandleMark in case we retry a GC multiple times.
1.544 + // Each time we attempt the GC, we allocate the handle below
1.545 + // to hold the pending list lock. We want to free this handle.
1.546 + HandleMark hm;
1.547 +
1.548 + Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock());
1.549 + assert(ObjectSynchronizer::current_thread_holds_lock(
1.550 + JavaThread::current(), h_lock),
1.551 + "Lock should be held");
1.552 + // Notify waiters on pending lists lock if there is any reference.
1.553 + if (java_lang_ref_Reference::pending_list() != NULL) {
1.554 + ObjectSynchronizer::notifyall(h_lock, THREAD);
1.555 + }
1.556 + ObjectSynchronizer::fast_exit(h_lock(), pending_list_basic_lock, THREAD);
1.557 + if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION;
1.558 +}
