| /* |
| * Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_GC_G1_G1OOPCLOSURES_INLINE_HPP |
| #define SHARE_VM_GC_G1_G1OOPCLOSURES_INLINE_HPP |
| |
| #include "gc/g1/g1CollectedHeap.hpp" |
| #include "gc/g1/g1ConcurrentMark.inline.hpp" |
| #include "gc/g1/g1OopClosures.hpp" |
| #include "gc/g1/g1ParScanThreadState.inline.hpp" |
| #include "gc/g1/g1RemSet.hpp" |
| #include "gc/g1/heapRegion.inline.hpp" |
| #include "gc/g1/heapRegionRemSet.hpp" |
| #include "memory/iterator.inline.hpp" |
| #include "oops/access.inline.hpp" |
| #include "oops/compressedOops.inline.hpp" |
| #include "oops/oopsHierarchy.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "runtime/prefetch.inline.hpp" |
| |
| template <class T> |
| inline void G1ScanClosureBase::prefetch_and_push(T* p, const oop obj) { |
| // We're not going to even bother checking whether the object is |
| // already forwarded or not, as this usually causes an immediate |
| // stall. We'll try to prefetch the object (for write, given that |
| // we might need to install the forwarding reference) and we'll |
| // get back to it when pop it from the queue |
| Prefetch::write(obj->mark_addr_raw(), 0); |
| Prefetch::read(obj->mark_addr_raw(), (HeapWordSize*2)); |
| |
| // slightly paranoid test; I'm trying to catch potential |
| // problems before we go into push_on_queue to know where the |
| // problem is coming from |
| assert((obj == RawAccess<>::oop_load(p)) || |
| (obj->is_forwarded() && |
| obj->forwardee() == RawAccess<>::oop_load(p)), |
| "p should still be pointing to obj or to its forwardee"); |
| |
| _par_scan_state->push_on_queue(p); |
| } |
| |
| template <class T> |
| inline void G1ScanClosureBase::handle_non_cset_obj_common(InCSetState const state, T* p, oop const obj) { |
| if (state.is_humongous()) { |
| _g1h->set_humongous_is_live(obj); |
| } |
| } |
| |
| inline void G1ScanClosureBase::trim_queue_partially() { |
| _par_scan_state->trim_queue_partially(); |
| } |
| |
| template <class T> |
| inline void G1ScanEvacuatedObjClosure::do_oop_work(T* p) { |
| T heap_oop = RawAccess<>::oop_load(p); |
| |
| if (CompressedOops::is_null(heap_oop)) { |
| return; |
| } |
| oop obj = CompressedOops::decode_not_null(heap_oop); |
| const InCSetState state = _g1h->in_cset_state(obj); |
| if (state.is_in_cset()) { |
| prefetch_and_push(p, obj); |
| } else { |
| if (HeapRegion::is_in_same_region(p, obj)) { |
| return; |
| } |
| handle_non_cset_obj_common(state, p, obj); |
| _par_scan_state->update_rs(_from, p, obj); |
| } |
| } |
| |
| template <class T> |
| inline void G1CMOopClosure::do_oop_work(T* p) { |
| _task->deal_with_reference(p); |
| } |
| |
| template <class T> |
| inline void G1RootRegionScanClosure::do_oop_work(T* p) { |
| T heap_oop = RawAccess<MO_VOLATILE>::oop_load(p); |
| if (CompressedOops::is_null(heap_oop)) { |
| return; |
| } |
| oop obj = CompressedOops::decode_not_null(heap_oop); |
| _cm->mark_in_next_bitmap(_worker_id, obj); |
| } |
| |
| template <class T> |
| inline static void check_obj_during_refinement(T* p, oop const obj) { |
| #ifdef ASSERT |
| G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| // can't do because of races |
| // assert(oopDesc::is_oop_or_null(obj), "expected an oop"); |
| assert(check_obj_alignment(obj), "not oop aligned"); |
| assert(g1h->is_in_reserved(obj), "must be in heap"); |
| |
| HeapRegion* from = g1h->heap_region_containing(p); |
| |
| assert(from != NULL, "from region must be non-NULL"); |
| assert(from->is_in_reserved(p) || |
| (from->is_humongous() && |
| g1h->heap_region_containing(p)->is_humongous() && |
| from->humongous_start_region() == g1h->heap_region_containing(p)->humongous_start_region()), |
| "p " PTR_FORMAT " is not in the same region %u or part of the correct humongous object starting at region %u.", |
| p2i(p), from->hrm_index(), from->humongous_start_region()->hrm_index()); |
| #endif // ASSERT |
| } |
| |
| template <class T> |
| inline void G1ConcurrentRefineOopClosure::do_oop_work(T* p) { |
| T o = RawAccess<MO_VOLATILE>::oop_load(p); |
| if (CompressedOops::is_null(o)) { |
| return; |
| } |
| oop obj = CompressedOops::decode_not_null(o); |
| |
| check_obj_during_refinement(p, obj); |
| |
| if (HeapRegion::is_in_same_region(p, obj)) { |
| // Normally this closure should only be called with cross-region references. |
| // But since Java threads are manipulating the references concurrently and we |
| // reload the values things may have changed. |
| // Also this check lets slip through references from a humongous continues region |
| // to its humongous start region, as they are in different regions, and adds a |
| // remembered set entry. This is benign (apart from memory usage), as we never |
| // try to either evacuate or eager reclaim humonguous arrays of j.l.O. |
| return; |
| } |
| |
| HeapRegionRemSet* to_rem_set = _g1h->heap_region_containing(obj)->rem_set(); |
| |
| assert(to_rem_set != NULL, "Need per-region 'into' remsets."); |
| if (to_rem_set->is_tracked()) { |
| to_rem_set->add_reference(p, _worker_i); |
| } |
| } |
| |
| template <class T> |
| inline void G1ScanObjsDuringUpdateRSClosure::do_oop_work(T* p) { |
| T o = RawAccess<>::oop_load(p); |
| if (CompressedOops::is_null(o)) { |
| return; |
| } |
| oop obj = CompressedOops::decode_not_null(o); |
| |
| check_obj_during_refinement(p, obj); |
| |
| assert(!_g1h->is_in_cset((HeapWord*)p), "Oop originates from " PTR_FORMAT " (region: %u) which is in the collection set.", p2i(p), _g1h->addr_to_region((HeapWord*)p)); |
| const InCSetState state = _g1h->in_cset_state(obj); |
| if (state.is_in_cset()) { |
| // Since the source is always from outside the collection set, here we implicitly know |
| // that this is a cross-region reference too. |
| prefetch_and_push(p, obj); |
| } else { |
| HeapRegion* to = _g1h->heap_region_containing(obj); |
| if (_from == to) { |
| return; |
| } |
| handle_non_cset_obj_common(state, p, obj); |
| to->rem_set()->add_reference(p, _worker_i); |
| } |
| } |
| |
| template <class T> |
| inline void G1ScanObjsDuringScanRSClosure::do_oop_work(T* p) { |
| T heap_oop = RawAccess<>::oop_load(p); |
| if (CompressedOops::is_null(heap_oop)) { |
| return; |
| } |
| oop obj = CompressedOops::decode_not_null(heap_oop); |
| |
| const InCSetState state = _g1h->in_cset_state(obj); |
| if (state.is_in_cset()) { |
| prefetch_and_push(p, obj); |
| } else { |
| if (HeapRegion::is_in_same_region(p, obj)) { |
| return; |
| } |
| handle_non_cset_obj_common(state, p, obj); |
| } |
| } |
| |
| void G1ParCopyHelper::do_cld_barrier(oop new_obj) { |
| if (_g1h->heap_region_containing(new_obj)->is_young()) { |
| _scanned_cld->record_modified_oops(); |
| } |
| } |
| |
| void G1ParCopyHelper::mark_object(oop obj) { |
| assert(!_g1h->heap_region_containing(obj)->in_collection_set(), "should not mark objects in the CSet"); |
| |
| // We know that the object is not moving so it's safe to read its size. |
| _cm->mark_in_next_bitmap(_worker_id, obj); |
| } |
| |
| void G1ParCopyHelper::mark_forwarded_object(oop from_obj, oop to_obj) { |
| assert(from_obj->is_forwarded(), "from obj should be forwarded"); |
| assert(from_obj->forwardee() == to_obj, "to obj should be the forwardee"); |
| assert(from_obj != to_obj, "should not be self-forwarded"); |
| |
| assert(_g1h->heap_region_containing(from_obj)->in_collection_set(), "from obj should be in the CSet"); |
| assert(!_g1h->heap_region_containing(to_obj)->in_collection_set(), "should not mark objects in the CSet"); |
| |
| // The object might be in the process of being copied by another |
| // worker so we cannot trust that its to-space image is |
| // well-formed. So we have to read its size from its from-space |
| // image which we know should not be changing. |
| _cm->mark_in_next_bitmap(_worker_id, to_obj, from_obj->size()); |
| } |
| |
| void G1ParCopyHelper::trim_queue_partially() { |
| _par_scan_state->trim_queue_partially(); |
| } |
| |
| template <G1Barrier barrier, G1Mark do_mark_object> |
| template <class T> |
| void G1ParCopyClosure<barrier, do_mark_object>::do_oop_work(T* p) { |
| T heap_oop = RawAccess<>::oop_load(p); |
| |
| if (CompressedOops::is_null(heap_oop)) { |
| return; |
| } |
| |
| oop obj = CompressedOops::decode_not_null(heap_oop); |
| |
| assert(_worker_id == _par_scan_state->worker_id(), "sanity"); |
| |
| const InCSetState state = _g1h->in_cset_state(obj); |
| if (state.is_in_cset()) { |
| oop forwardee; |
| markOop m = obj->mark_raw(); |
| if (m.is_marked()) { |
| forwardee = (oop) m.decode_pointer(); |
| } else { |
| forwardee = _par_scan_state->copy_to_survivor_space(state, obj, m); |
| } |
| assert(forwardee != NULL, "forwardee should not be NULL"); |
| RawAccess<IS_NOT_NULL>::oop_store(p, forwardee); |
| if (do_mark_object != G1MarkNone && forwardee != obj) { |
| // If the object is self-forwarded we don't need to explicitly |
| // mark it, the evacuation failure protocol will do so. |
| mark_forwarded_object(obj, forwardee); |
| } |
| |
| if (barrier == G1BarrierCLD) { |
| do_cld_barrier(forwardee); |
| } |
| } else { |
| if (state.is_humongous()) { |
| _g1h->set_humongous_is_live(obj); |
| } |
| |
| // The object is not in collection set. If we're a root scanning |
| // closure during an initial mark pause then attempt to mark the object. |
| if (do_mark_object == G1MarkFromRoot) { |
| mark_object(obj); |
| } |
| } |
| trim_queue_partially(); |
| } |
| |
| template <class T> void G1RebuildRemSetClosure::do_oop_work(T* p) { |
| oop const obj = RawAccess<MO_VOLATILE>::oop_load(p); |
| if (obj == NULL) { |
| return; |
| } |
| |
| if (HeapRegion::is_in_same_region(p, obj)) { |
| return; |
| } |
| |
| HeapRegion* to = _g1h->heap_region_containing(obj); |
| HeapRegionRemSet* rem_set = to->rem_set(); |
| rem_set->add_reference(p, _worker_id); |
| } |
| |
| #endif // SHARE_VM_GC_G1_G1OOPCLOSURES_INLINE_HPP |