author | stefank |
Tue, 06 Aug 2019 10:48:21 +0200 | |
changeset 57777 | 90ead0febf56 |
parent 54934 | 39814e0a8964 |
child 58015 | dd84de796f2c |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2019, 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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||
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#ifndef SHARE_GC_G1_G1OOPCLOSURES_INLINE_HPP |
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#define SHARE_GC_G1_G1OOPCLOSURES_INLINE_HPP |
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#include "gc/g1/g1CollectedHeap.hpp" |
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#include "gc/g1/g1ConcurrentMark.inline.hpp" |
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#include "gc/g1/g1OopClosures.hpp" |
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#include "gc/g1/g1ParScanThreadState.inline.hpp" |
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#include "gc/g1/g1RemSet.hpp" |
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#include "gc/g1/heapRegion.inline.hpp" |
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#include "gc/g1/heapRegionRemSet.hpp" |
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#include "memory/iterator.inline.hpp" |
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#include "oops/access.inline.hpp" |
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#include "oops/compressedOops.inline.hpp" |
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#include "oops/oopsHierarchy.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/prefetch.inline.hpp" |
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template <class T> |
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inline void G1ScanClosureBase::prefetch_and_push(T* p, const oop obj) { |
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// We're not going to even bother checking whether the object is |
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// already forwarded or not, as this usually causes an immediate |
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// stall. We'll try to prefetch the object (for write, given that |
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// we might need to install the forwarding reference) and we'll |
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// get back to it when pop it from the queue |
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Prefetch::write(obj->mark_addr_raw(), 0); |
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Prefetch::read(obj->mark_addr_raw(), (HeapWordSize*2)); |
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// slightly paranoid test; I'm trying to catch potential |
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// problems before we go into push_on_queue to know where the |
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// problem is coming from |
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assert((obj == RawAccess<>::oop_load(p)) || |
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(obj->is_forwarded() && |
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obj->forwardee() == RawAccess<>::oop_load(p)), |
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"p should still be pointing to obj or to its forwardee"); |
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_par_scan_state->push_on_queue(p); |
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} |
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template <class T> |
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inline void G1ScanClosureBase::handle_non_cset_obj_common(G1HeapRegionAttr const region_attr, T* p, oop const obj) { |
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if (region_attr.is_humongous()) { |
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_g1h->set_humongous_is_live(obj); |
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} else if (region_attr.is_optional()) { |
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_par_scan_state->remember_reference_into_optional_region(p); |
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} |
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} |
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inline void G1ScanClosureBase::trim_queue_partially() { |
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_par_scan_state->trim_queue_partially(); |
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} |
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template <class T> |
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inline void G1ScanEvacuatedObjClosure::do_oop_work(T* p) { |
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T heap_oop = RawAccess<>::oop_load(p); |
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if (CompressedOops::is_null(heap_oop)) { |
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return; |
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} |
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oop obj = CompressedOops::decode_not_null(heap_oop); |
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const G1HeapRegionAttr region_attr = _g1h->region_attr(obj); |
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if (region_attr.is_in_cset()) { |
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prefetch_and_push(p, obj); |
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} else if (!HeapRegion::is_in_same_region(p, obj)) { |
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handle_non_cset_obj_common(region_attr, p, obj); |
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assert(_scanning_in_young != Uninitialized, "Scan location has not been initialized."); |
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if (_scanning_in_young == True) { |
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return; |
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} |
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_par_scan_state->enqueue_card_if_tracked(region_attr, p, obj); |
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} |
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} |
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template <class T> |
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inline void G1CMOopClosure::do_oop_work(T* p) { |
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_task->deal_with_reference(p); |
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} |
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template <class T> |
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inline void G1RootRegionScanClosure::do_oop_work(T* p) { |
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T heap_oop = RawAccess<MO_VOLATILE>::oop_load(p); |
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if (CompressedOops::is_null(heap_oop)) { |
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return; |
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} |
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oop obj = CompressedOops::decode_not_null(heap_oop); |
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_cm->mark_in_next_bitmap(_worker_id, obj); |
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} |
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template <class T> |
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inline static void check_obj_during_refinement(T* p, oop const obj) { |
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#ifdef ASSERT |
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G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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// can't do because of races |
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// assert(oopDesc::is_oop_or_null(obj), "expected an oop"); |
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assert(check_obj_alignment(obj), "not oop aligned"); |
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assert(g1h->is_in_reserved(obj), "must be in heap"); |
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HeapRegion* from = g1h->heap_region_containing(p); |
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assert(from != NULL, "from region must be non-NULL"); |
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assert(from->is_in_reserved(p) || |
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(from->is_humongous() && |
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g1h->heap_region_containing(p)->is_humongous() && |
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from->humongous_start_region() == g1h->heap_region_containing(p)->humongous_start_region()), |
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"p " PTR_FORMAT " is not in the same region %u or part of the correct humongous object starting at region %u.", |
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p2i(p), from->hrm_index(), from->humongous_start_region()->hrm_index()); |
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#endif // ASSERT |
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} |
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template <class T> |
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inline void G1ConcurrentRefineOopClosure::do_oop_work(T* p) { |
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T o = RawAccess<MO_VOLATILE>::oop_load(p); |
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if (CompressedOops::is_null(o)) { |
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return; |
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} |
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oop obj = CompressedOops::decode_not_null(o); |
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check_obj_during_refinement(p, obj); |
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if (HeapRegion::is_in_same_region(p, obj)) { |
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// Normally this closure should only be called with cross-region references. |
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// But since Java threads are manipulating the references concurrently and we |
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// reload the values things may have changed. |
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// Also this check lets slip through references from a humongous continues region |
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// to its humongous start region, as they are in different regions, and adds a |
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// remembered set entry. This is benign (apart from memory usage), as we never |
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// try to either evacuate or eager reclaim humonguous arrays of j.l.O. |
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return; |
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} |
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HeapRegionRemSet* to_rem_set = _g1h->heap_region_containing(obj)->rem_set(); |
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assert(to_rem_set != NULL, "Need per-region 'into' remsets."); |
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if (to_rem_set->is_tracked()) { |
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to_rem_set->add_reference(p, _worker_i); |
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} |
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} |
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|
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template <class T> |
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inline void G1ScanCardClosure::do_oop_work(T* p) { |
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T o = RawAccess<>::oop_load(p); |
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if (CompressedOops::is_null(o)) { |
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return; |
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} |
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oop obj = CompressedOops::decode_not_null(o); |
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|
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check_obj_during_refinement(p, obj); |
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|
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assert(!_g1h->is_in_cset((HeapWord*)p), |
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"Oop originates from " PTR_FORMAT " (region: %u) which is in the collection set.", |
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p2i(p), _g1h->addr_to_region((HeapWord*)p)); |
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|
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const G1HeapRegionAttr region_attr = _g1h->region_attr(obj); |
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if (region_attr.is_in_cset()) { |
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// Since the source is always from outside the collection set, here we implicitly know |
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// that this is a cross-region reference too. |
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prefetch_and_push(p, obj); |
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} else if (!HeapRegion::is_in_same_region(p, obj)) { |
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handle_non_cset_obj_common(region_attr, p, obj); |
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_par_scan_state->enqueue_card_if_tracked(region_attr, p, obj); |
46572 | 184 |
} |
185 |
} |
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|
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template <class T> |
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inline void G1ScanRSForOptionalClosure::do_oop_work(T* p) { |
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const G1HeapRegionAttr region_attr = _g1h->region_attr(p); |
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// Entries in the optional collection set may start to originate from the collection |
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// set after one or more increments. In this case, previously optional regions |
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// became actual collection set regions. Filter them out here. |
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if (region_attr.is_in_cset()) { |
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194 |
return; |
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195 |
} |
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_scan_cl->do_oop_work(p); |
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_scan_cl->trim_queue_partially(); |
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} |
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199 |
|
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void G1ParCopyHelper::do_cld_barrier(oop new_obj) { |
49806 | 201 |
if (_g1h->heap_region_containing(new_obj)->is_young()) { |
47580 | 202 |
_scanned_cld->record_modified_oops(); |
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} |
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} |
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205 |
|
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void G1ParCopyHelper::mark_object(oop obj) { |
49806 | 207 |
assert(!_g1h->heap_region_containing(obj)->in_collection_set(), "should not mark objects in the CSet"); |
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208 |
|
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// We know that the object is not moving so it's safe to read its size. |
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_cm->mark_in_next_bitmap(_worker_id, obj); |
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} |
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|
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void G1ParCopyHelper::trim_queue_partially() { |
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_par_scan_state->trim_queue_partially(); |
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215 |
} |
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216 |
|
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217 |
template <G1Barrier barrier, G1Mark do_mark_object> |
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template <class T> |
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void G1ParCopyClosure<barrier, do_mark_object>::do_oop_work(T* p) { |
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T heap_oop = RawAccess<>::oop_load(p); |
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221 |
|
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if (CompressedOops::is_null(heap_oop)) { |
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223 |
return; |
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224 |
} |
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|
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oop obj = CompressedOops::decode_not_null(heap_oop); |
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|
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assert(_worker_id == _par_scan_state->worker_id(), "sanity"); |
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|
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const G1HeapRegionAttr state = _g1h->region_attr(obj); |
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231 |
if (state.is_in_cset()) { |
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oop forwardee; |
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markWord m = obj->mark_raw(); |
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if (m.is_marked()) { |
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forwardee = (oop) m.decode_pointer(); |
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236 |
} else { |
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forwardee = _par_scan_state->copy_to_survivor_space(state, obj, m); |
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238 |
} |
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239 |
assert(forwardee != NULL, "forwardee should not be NULL"); |
50728 | 240 |
RawAccess<IS_NOT_NULL>::oop_store(p, forwardee); |
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241 |
|
47580 | 242 |
if (barrier == G1BarrierCLD) { |
243 |
do_cld_barrier(forwardee); |
|
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244 |
} |
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245 |
} else { |
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246 |
if (state.is_humongous()) { |
49806 | 247 |
_g1h->set_humongous_is_live(obj); |
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} else if (state.is_optional()) { |
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249 |
_par_scan_state->remember_root_into_optional_region(p); |
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250 |
} |
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251 |
|
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// The object is not in collection set. If we're a root scanning |
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// closure during an initial mark pause then attempt to mark the object. |
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254 |
if (do_mark_object == G1MarkFromRoot) { |
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255 |
mark_object(obj); |
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256 |
} |
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257 |
} |
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trim_queue_partially(); |
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259 |
} |
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260 |
|
50752 | 261 |
template <class T> void G1RebuildRemSetClosure::do_oop_work(T* p) { |
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oop const obj = RawAccess<MO_VOLATILE>::oop_load(p); |
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263 |
if (obj == NULL) { |
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264 |
return; |
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265 |
} |
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266 |
|
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267 |
if (HeapRegion::is_in_same_region(p, obj)) { |
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268 |
return; |
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269 |
} |
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|
49806 | 271 |
HeapRegion* to = _g1h->heap_region_containing(obj); |
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HeapRegionRemSet* rem_set = to->rem_set(); |
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rem_set->add_reference(p, _worker_id); |
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274 |
} |
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|
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#endif // SHARE_GC_G1_G1OOPCLOSURES_INLINE_HPP |