12b9a4edbb
Simple renaming to be consistent with instanceKlass->InstanceKlass renaming Reviewed-by: stefank, jmasa
553 lines
25 KiB
C++
553 lines
25 KiB
C++
/*
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* Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "classfile/javaClasses.hpp"
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#include "classfile/systemDictionary.hpp"
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#include "gc_implementation/shared/markSweep.inline.hpp"
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#include "gc_interface/collectedHeap.hpp"
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#include "gc_interface/collectedHeap.inline.hpp"
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#include "memory/genCollectedHeap.hpp"
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#include "memory/genOopClosures.inline.hpp"
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#include "oops/instanceRefKlass.hpp"
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#include "oops/oop.inline.hpp"
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#include "utilities/preserveException.hpp"
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#ifndef SERIALGC
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#include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
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#include "gc_implementation/g1/g1OopClosures.inline.hpp"
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#include "gc_implementation/g1/g1RemSet.inline.hpp"
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#include "gc_implementation/g1/heapRegionSeq.inline.hpp"
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#include "gc_implementation/parNew/parOopClosures.inline.hpp"
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#include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
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#include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
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#include "oops/oop.pcgc.inline.hpp"
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#endif
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template <class T>
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void specialized_oop_follow_contents(InstanceRefKlass* ref, oop obj) {
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T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
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T heap_oop = oopDesc::load_heap_oop(referent_addr);
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debug_only(
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if(TraceReferenceGC && PrintGCDetails) {
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gclog_or_tty->print_cr("InstanceRefKlass::oop_follow_contents " INTPTR_FORMAT, obj);
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}
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)
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if (!oopDesc::is_null(heap_oop)) {
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oop referent = oopDesc::decode_heap_oop_not_null(heap_oop);
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if (!referent->is_gc_marked() &&
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MarkSweep::ref_processor()->discover_reference(obj, ref->reference_type())) {
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// reference was discovered, referent will be traversed later
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ref->InstanceKlass::oop_follow_contents(obj);
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debug_only(
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if(TraceReferenceGC && PrintGCDetails) {
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gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, obj);
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}
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)
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return;
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} else {
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// treat referent as normal oop
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debug_only(
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if(TraceReferenceGC && PrintGCDetails) {
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gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, obj);
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}
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)
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MarkSweep::mark_and_push(referent_addr);
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}
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}
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T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
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if (ReferenceProcessor::pending_list_uses_discovered_field()) {
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// Treat discovered as normal oop, if ref is not "active",
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// i.e. if next is non-NULL.
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T next_oop = oopDesc::load_heap_oop(next_addr);
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if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active"
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T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
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debug_only(
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if(TraceReferenceGC && PrintGCDetails) {
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gclog_or_tty->print_cr(" Process discovered as normal "
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INTPTR_FORMAT, discovered_addr);
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}
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)
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MarkSweep::mark_and_push(discovered_addr);
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}
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} else {
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#ifdef ASSERT
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// In the case of older JDKs which do not use the discovered
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// field for the pending list, an inactive ref (next != NULL)
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// must always have a NULL discovered field.
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oop next = oopDesc::load_decode_heap_oop(next_addr);
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oop discovered = java_lang_ref_Reference::discovered(obj);
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assert(oopDesc::is_null(next) || oopDesc::is_null(discovered),
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err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field",
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(oopDesc*)obj));
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#endif
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}
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// treat next as normal oop. next is a link in the reference queue.
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debug_only(
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if(TraceReferenceGC && PrintGCDetails) {
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gclog_or_tty->print_cr(" Process next as normal " INTPTR_FORMAT, next_addr);
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}
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)
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MarkSweep::mark_and_push(next_addr);
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ref->InstanceKlass::oop_follow_contents(obj);
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}
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void InstanceRefKlass::oop_follow_contents(oop obj) {
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if (UseCompressedOops) {
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specialized_oop_follow_contents<narrowOop>(this, obj);
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} else {
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specialized_oop_follow_contents<oop>(this, obj);
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}
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}
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#ifndef SERIALGC
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template <class T>
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void specialized_oop_follow_contents(InstanceRefKlass* ref,
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ParCompactionManager* cm,
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oop obj) {
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T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
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T heap_oop = oopDesc::load_heap_oop(referent_addr);
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debug_only(
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if(TraceReferenceGC && PrintGCDetails) {
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gclog_or_tty->print_cr("InstanceRefKlass::oop_follow_contents " INTPTR_FORMAT, obj);
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}
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)
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if (!oopDesc::is_null(heap_oop)) {
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oop referent = oopDesc::decode_heap_oop_not_null(heap_oop);
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if (PSParallelCompact::mark_bitmap()->is_unmarked(referent) &&
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PSParallelCompact::ref_processor()->
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discover_reference(obj, ref->reference_type())) {
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// reference already enqueued, referent will be traversed later
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ref->InstanceKlass::oop_follow_contents(cm, obj);
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debug_only(
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if(TraceReferenceGC && PrintGCDetails) {
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gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, obj);
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}
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)
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return;
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} else {
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// treat referent as normal oop
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debug_only(
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if(TraceReferenceGC && PrintGCDetails) {
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gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, obj);
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}
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)
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PSParallelCompact::mark_and_push(cm, referent_addr);
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}
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}
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T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
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if (ReferenceProcessor::pending_list_uses_discovered_field()) {
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// Treat discovered as normal oop, if ref is not "active",
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// i.e. if next is non-NULL.
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T next_oop = oopDesc::load_heap_oop(next_addr);
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if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active"
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T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
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debug_only(
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if(TraceReferenceGC && PrintGCDetails) {
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gclog_or_tty->print_cr(" Process discovered as normal "
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INTPTR_FORMAT, discovered_addr);
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}
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)
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PSParallelCompact::mark_and_push(cm, discovered_addr);
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}
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} else {
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#ifdef ASSERT
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// In the case of older JDKs which do not use the discovered
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// field for the pending list, an inactive ref (next != NULL)
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// must always have a NULL discovered field.
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T next = oopDesc::load_heap_oop(next_addr);
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oop discovered = java_lang_ref_Reference::discovered(obj);
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assert(oopDesc::is_null(next) || oopDesc::is_null(discovered),
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err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field",
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(oopDesc*)obj));
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#endif
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}
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PSParallelCompact::mark_and_push(cm, next_addr);
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ref->InstanceKlass::oop_follow_contents(cm, obj);
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}
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void InstanceRefKlass::oop_follow_contents(ParCompactionManager* cm,
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oop obj) {
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if (UseCompressedOops) {
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specialized_oop_follow_contents<narrowOop>(this, cm, obj);
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} else {
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specialized_oop_follow_contents<oop>(this, cm, obj);
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}
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}
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#endif // SERIALGC
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#ifdef ASSERT
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template <class T> void trace_reference_gc(const char *s, oop obj,
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T* referent_addr,
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T* next_addr,
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T* discovered_addr) {
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if(TraceReferenceGC && PrintGCDetails) {
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gclog_or_tty->print_cr("%s obj " INTPTR_FORMAT, s, (address)obj);
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gclog_or_tty->print_cr(" referent_addr/* " INTPTR_FORMAT " / "
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INTPTR_FORMAT, referent_addr,
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referent_addr ?
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(address)oopDesc::load_decode_heap_oop(referent_addr) : NULL);
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gclog_or_tty->print_cr(" next_addr/* " INTPTR_FORMAT " / "
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INTPTR_FORMAT, next_addr,
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next_addr ? (address)oopDesc::load_decode_heap_oop(next_addr) : NULL);
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gclog_or_tty->print_cr(" discovered_addr/* " INTPTR_FORMAT " / "
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INTPTR_FORMAT, discovered_addr,
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discovered_addr ?
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(address)oopDesc::load_decode_heap_oop(discovered_addr) : NULL);
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}
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}
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#endif
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template <class T> void specialized_oop_adjust_pointers(InstanceRefKlass *ref, oop obj) {
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T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
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MarkSweep::adjust_pointer(referent_addr);
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T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
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MarkSweep::adjust_pointer(next_addr);
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T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
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MarkSweep::adjust_pointer(discovered_addr);
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debug_only(trace_reference_gc("InstanceRefKlass::oop_adjust_pointers", obj,
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referent_addr, next_addr, discovered_addr);)
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}
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int InstanceRefKlass::oop_adjust_pointers(oop obj) {
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int size = size_helper();
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InstanceKlass::oop_adjust_pointers(obj);
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if (UseCompressedOops) {
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specialized_oop_adjust_pointers<narrowOop>(this, obj);
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} else {
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specialized_oop_adjust_pointers<oop>(this, obj);
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}
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return size;
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}
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#define InstanceRefKlass_SPECIALIZED_OOP_ITERATE(T, nv_suffix, contains) \
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T* disc_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); \
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if (closure->apply_to_weak_ref_discovered_field()) { \
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closure->do_oop##nv_suffix(disc_addr); \
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} \
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\
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T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); \
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T heap_oop = oopDesc::load_heap_oop(referent_addr); \
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ReferenceProcessor* rp = closure->_ref_processor; \
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if (!oopDesc::is_null(heap_oop)) { \
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oop referent = oopDesc::decode_heap_oop_not_null(heap_oop); \
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if (!referent->is_gc_marked() && (rp != NULL) && \
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rp->discover_reference(obj, reference_type())) { \
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return size; \
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} else if (contains(referent_addr)) { \
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/* treat referent as normal oop */ \
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SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\
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closure->do_oop##nv_suffix(referent_addr); \
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} \
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} \
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T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); \
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if (ReferenceProcessor::pending_list_uses_discovered_field()) { \
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T next_oop = oopDesc::load_heap_oop(next_addr); \
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/* Treat discovered as normal oop, if ref is not "active" (next non-NULL) */\
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if (!oopDesc::is_null(next_oop) && contains(disc_addr)) { \
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/* i.e. ref is not "active" */ \
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debug_only( \
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if(TraceReferenceGC && PrintGCDetails) { \
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gclog_or_tty->print_cr(" Process discovered as normal " \
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INTPTR_FORMAT, disc_addr); \
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} \
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) \
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SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\
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closure->do_oop##nv_suffix(disc_addr); \
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} \
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} else { \
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/* In the case of older JDKs which do not use the discovered field for */ \
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/* the pending list, an inactive ref (next != NULL) must always have a */ \
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/* NULL discovered field. */ \
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debug_only( \
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T next_oop = oopDesc::load_heap_oop(next_addr); \
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T disc_oop = oopDesc::load_heap_oop(disc_addr); \
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assert(oopDesc::is_null(next_oop) || oopDesc::is_null(disc_oop), \
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err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL" \
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"discovered field", (oopDesc*)obj)); \
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) \
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} \
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/* treat next as normal oop */ \
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if (contains(next_addr)) { \
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SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk); \
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closure->do_oop##nv_suffix(next_addr); \
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} \
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return size; \
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template <class T> bool contains(T *t) { return true; }
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// Macro to define InstanceRefKlass::oop_oop_iterate for virtual/nonvirtual for
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// all closures. Macros calling macros above for each oop size.
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#define InstanceRefKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \
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\
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int InstanceRefKlass:: \
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oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \
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/* Get size before changing pointers */ \
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SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
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\
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int size = InstanceKlass::oop_oop_iterate##nv_suffix(obj, closure); \
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\
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if (UseCompressedOops) { \
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InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, contains); \
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} else { \
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InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, contains); \
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} \
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}
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#ifndef SERIALGC
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#define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \
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\
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int InstanceRefKlass:: \
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oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure) { \
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/* Get size before changing pointers */ \
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SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
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\
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int size = InstanceKlass::oop_oop_iterate_backwards##nv_suffix(obj, closure); \
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\
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if (UseCompressedOops) { \
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InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, contains); \
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} else { \
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InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, contains); \
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} \
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}
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#endif // !SERIALGC
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#define InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \
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\
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int InstanceRefKlass:: \
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oop_oop_iterate##nv_suffix##_m(oop obj, \
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OopClosureType* closure, \
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MemRegion mr) { \
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SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
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\
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int size = InstanceKlass::oop_oop_iterate##nv_suffix##_m(obj, closure, mr); \
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if (UseCompressedOops) { \
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InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, mr.contains); \
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} else { \
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InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, mr.contains); \
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} \
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}
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ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN)
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ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN)
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#ifndef SERIALGC
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ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
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ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
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#endif // SERIALGC
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ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m)
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ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m)
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#ifndef SERIALGC
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template <class T>
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void specialized_oop_push_contents(InstanceRefKlass *ref,
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PSPromotionManager* pm, oop obj) {
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T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
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if (PSScavenge::should_scavenge(referent_addr)) {
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ReferenceProcessor* rp = PSScavenge::reference_processor();
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if (rp->discover_reference(obj, ref->reference_type())) {
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// reference already enqueued, referent and next will be traversed later
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ref->InstanceKlass::oop_push_contents(pm, obj);
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return;
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} else {
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// treat referent as normal oop
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pm->claim_or_forward_depth(referent_addr);
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}
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}
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// Treat discovered as normal oop, if ref is not "active",
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// i.e. if next is non-NULL.
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T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
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if (ReferenceProcessor::pending_list_uses_discovered_field()) {
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T next_oop = oopDesc::load_heap_oop(next_addr);
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if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active"
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T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
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debug_only(
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if(TraceReferenceGC && PrintGCDetails) {
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gclog_or_tty->print_cr(" Process discovered as normal "
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INTPTR_FORMAT, discovered_addr);
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}
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)
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if (PSScavenge::should_scavenge(discovered_addr)) {
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pm->claim_or_forward_depth(discovered_addr);
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}
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}
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} else {
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#ifdef ASSERT
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// In the case of older JDKs which do not use the discovered
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// field for the pending list, an inactive ref (next != NULL)
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// must always have a NULL discovered field.
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oop next = oopDesc::load_decode_heap_oop(next_addr);
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oop discovered = java_lang_ref_Reference::discovered(obj);
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assert(oopDesc::is_null(next) || oopDesc::is_null(discovered),
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err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field",
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(oopDesc*)obj));
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#endif
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}
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// Treat next as normal oop; next is a link in the reference queue.
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if (PSScavenge::should_scavenge(next_addr)) {
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pm->claim_or_forward_depth(next_addr);
|
|
}
|
|
ref->InstanceKlass::oop_push_contents(pm, obj);
|
|
}
|
|
|
|
void InstanceRefKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
|
|
if (UseCompressedOops) {
|
|
specialized_oop_push_contents<narrowOop>(this, pm, obj);
|
|
} else {
|
|
specialized_oop_push_contents<oop>(this, pm, obj);
|
|
}
|
|
}
|
|
|
|
template <class T>
|
|
void specialized_oop_update_pointers(InstanceRefKlass *ref,
|
|
ParCompactionManager* cm, oop obj) {
|
|
T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
|
|
PSParallelCompact::adjust_pointer(referent_addr);
|
|
T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
|
|
PSParallelCompact::adjust_pointer(next_addr);
|
|
T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
|
|
PSParallelCompact::adjust_pointer(discovered_addr);
|
|
debug_only(trace_reference_gc("InstanceRefKlass::oop_update_ptrs", obj,
|
|
referent_addr, next_addr, discovered_addr);)
|
|
}
|
|
|
|
int InstanceRefKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
|
|
InstanceKlass::oop_update_pointers(cm, obj);
|
|
if (UseCompressedOops) {
|
|
specialized_oop_update_pointers<narrowOop>(this, cm, obj);
|
|
} else {
|
|
specialized_oop_update_pointers<oop>(this, cm, obj);
|
|
}
|
|
return size_helper();
|
|
}
|
|
#endif // SERIALGC
|
|
|
|
void InstanceRefKlass::update_nonstatic_oop_maps(Klass* k) {
|
|
// Clear the nonstatic oop-map entries corresponding to referent
|
|
// and nextPending field. They are treated specially by the
|
|
// garbage collector.
|
|
// The discovered field is used only by the garbage collector
|
|
// and is also treated specially.
|
|
InstanceKlass* ik = InstanceKlass::cast(k);
|
|
|
|
// Check that we have the right class
|
|
debug_only(static bool first_time = true);
|
|
assert(k == SystemDictionary::Reference_klass() && first_time,
|
|
"Invalid update of maps");
|
|
debug_only(first_time = false);
|
|
assert(ik->nonstatic_oop_map_count() == 1, "just checking");
|
|
|
|
OopMapBlock* map = ik->start_of_nonstatic_oop_maps();
|
|
|
|
// Check that the current map is (2,4) - currently points at field with
|
|
// offset 2 (words) and has 4 map entries.
|
|
debug_only(int offset = java_lang_ref_Reference::referent_offset);
|
|
debug_only(unsigned int count = ((java_lang_ref_Reference::discovered_offset -
|
|
java_lang_ref_Reference::referent_offset)/heapOopSize) + 1);
|
|
|
|
if (UseSharedSpaces) {
|
|
assert(map->offset() == java_lang_ref_Reference::queue_offset &&
|
|
map->count() == 1, "just checking");
|
|
} else {
|
|
assert(map->offset() == offset && map->count() == count,
|
|
"just checking");
|
|
|
|
// Update map to (3,1) - point to offset of 3 (words) with 1 map entry.
|
|
map->set_offset(java_lang_ref_Reference::queue_offset);
|
|
map->set_count(1);
|
|
}
|
|
}
|
|
|
|
|
|
// Verification
|
|
|
|
void InstanceRefKlass::oop_verify_on(oop obj, outputStream* st) {
|
|
InstanceKlass::oop_verify_on(obj, st);
|
|
// Verify referent field
|
|
oop referent = java_lang_ref_Reference::referent(obj);
|
|
|
|
// We should make this general to all heaps
|
|
GenCollectedHeap* gch = NULL;
|
|
if (Universe::heap()->kind() == CollectedHeap::GenCollectedHeap)
|
|
gch = GenCollectedHeap::heap();
|
|
|
|
if (referent != NULL) {
|
|
guarantee(referent->is_oop(), "referent field heap failed");
|
|
}
|
|
// Verify next field
|
|
oop next = java_lang_ref_Reference::next(obj);
|
|
if (next != NULL) {
|
|
guarantee(next->is_oop(), "next field verify failed");
|
|
guarantee(next->is_instanceRef(), "next field verify failed");
|
|
}
|
|
}
|
|
|
|
bool InstanceRefKlass::owns_pending_list_lock(JavaThread* thread) {
|
|
if (java_lang_ref_Reference::pending_list_lock() == NULL) return false;
|
|
Handle h_lock(thread, java_lang_ref_Reference::pending_list_lock());
|
|
return ObjectSynchronizer::current_thread_holds_lock(thread, h_lock);
|
|
}
|
|
|
|
void InstanceRefKlass::acquire_pending_list_lock(BasicLock *pending_list_basic_lock) {
|
|
// we may enter this with pending exception set
|
|
PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument
|
|
|
|
// Create a HandleMark in case we retry a GC multiple times.
|
|
// Each time we attempt the GC, we allocate the handle below
|
|
// to hold the pending list lock. We want to free this handle.
|
|
HandleMark hm;
|
|
|
|
Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock());
|
|
ObjectSynchronizer::fast_enter(h_lock, pending_list_basic_lock, false, THREAD);
|
|
assert(ObjectSynchronizer::current_thread_holds_lock(
|
|
JavaThread::current(), h_lock),
|
|
"Locking should have succeeded");
|
|
if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION;
|
|
}
|
|
|
|
void InstanceRefKlass::release_and_notify_pending_list_lock(
|
|
BasicLock *pending_list_basic_lock) {
|
|
// we may enter this with pending exception set
|
|
PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument
|
|
|
|
// Create a HandleMark in case we retry a GC multiple times.
|
|
// Each time we attempt the GC, we allocate the handle below
|
|
// to hold the pending list lock. We want to free this handle.
|
|
HandleMark hm;
|
|
|
|
Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock());
|
|
assert(ObjectSynchronizer::current_thread_holds_lock(
|
|
JavaThread::current(), h_lock),
|
|
"Lock should be held");
|
|
// Notify waiters on pending lists lock if there is any reference.
|
|
if (java_lang_ref_Reference::pending_list() != NULL) {
|
|
ObjectSynchronizer::notifyall(h_lock, THREAD);
|
|
}
|
|
ObjectSynchronizer::fast_exit(h_lock(), pending_list_basic_lock, THREAD);
|
|
if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION;
|
|
}
|