author | kbarrett |
Sun, 11 Feb 2018 03:12:15 -0500 | |
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/* |
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* Copyright (c) 2001, 2017, 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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#ifndef SHARE_VM_GC_G1_G1SATBCARDTABLEMODREFBS_HPP |
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#define SHARE_VM_GC_G1_G1SATBCARDTABLEMODREFBS_HPP |
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#include "gc/g1/g1RegionToSpaceMapper.hpp" |
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#include "gc/shared/cardTableModRefBS.hpp" |
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#include "memory/memRegion.hpp" |
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#include "oops/oop.hpp" |
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#include "utilities/macros.hpp" |
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class DirtyCardQueueSet; |
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class G1SATBCardTableLoggingModRefBS; |
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// This barrier is specialized to use a logging barrier to support |
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// snapshot-at-the-beginning marking. |
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class G1SATBCardTableModRefBS: public CardTableModRefBS { |
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friend class VMStructs; |
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protected: |
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enum G1CardValues { |
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g1_young_gen = CT_MR_BS_last_reserved << 1 |
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}; |
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G1SATBCardTableModRefBS(MemRegion whole_heap, const BarrierSet::FakeRtti& fake_rtti); |
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~G1SATBCardTableModRefBS() { } |
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public: |
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static int g1_young_card_val() { return g1_young_gen; } |
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// Add "pre_val" to a set of objects that may have been disconnected from the |
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// pre-marking object graph. |
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static void enqueue(oop pre_val); |
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static void enqueue_if_weak_or_archive(DecoratorSet decorators, oop value); |
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template <class T> void write_ref_array_pre_work(T* dst, int count); |
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virtual void write_ref_array_pre(oop* dst, int count, bool dest_uninitialized); |
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virtual void write_ref_array_pre(narrowOop* dst, int count, bool dest_uninitialized); |
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template <DecoratorSet decorators, typename T> |
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void write_ref_field_pre(T* field); |
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/* |
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Claimed and deferred bits are used together in G1 during the evacuation |
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pause. These bits can have the following state transitions: |
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1. The claimed bit can be put over any other card state. Except that |
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the "dirty -> dirty and claimed" transition is checked for in |
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G1 code and is not used. |
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2. Deferred bit can be set only if the previous state of the card |
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was either clean or claimed. mark_card_deferred() is wait-free. |
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We do not care if the operation is be successful because if |
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it does not it will only result in duplicate entry in the update |
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buffer because of the "cache-miss". So it's not worth spinning. |
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*/ |
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bool is_card_claimed(size_t card_index) { |
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jbyte val = _byte_map[card_index]; |
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return (val & (clean_card_mask_val() | claimed_card_val())) == claimed_card_val(); |
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} |
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inline void set_card_claimed(size_t card_index); |
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void verify_g1_young_region(MemRegion mr) PRODUCT_RETURN; |
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void g1_mark_as_young(const MemRegion& mr); |
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bool mark_card_deferred(size_t card_index); |
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bool is_card_deferred(size_t card_index) { |
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jbyte val = _byte_map[card_index]; |
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return (val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val(); |
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} |
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}; |
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template<> |
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struct BarrierSet::GetName<G1SATBCardTableModRefBS> { |
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static const BarrierSet::Name value = BarrierSet::G1SATBCT; |
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}; |
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template<> |
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struct BarrierSet::GetType<BarrierSet::G1SATBCT> { |
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typedef G1SATBCardTableModRefBS type; |
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}; |
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class G1SATBCardTableLoggingModRefBSChangedListener : public G1MappingChangedListener { |
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G1SATBCardTableLoggingModRefBS* _card_table; |
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public: |
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G1SATBCardTableLoggingModRefBSChangedListener() : _card_table(NULL) { } |
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void set_card_table(G1SATBCardTableLoggingModRefBS* card_table) { _card_table = card_table; } |
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virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled); |
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}; |
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// Adds card-table logging to the post-barrier. |
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// Usual invariant: all dirty cards are logged in the DirtyCardQueueSet. |
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class G1SATBCardTableLoggingModRefBS: public G1SATBCardTableModRefBS { |
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friend class G1SATBCardTableLoggingModRefBSChangedListener; |
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G1SATBCardTableLoggingModRefBSChangedListener _listener; |
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DirtyCardQueueSet& _dcqs; |
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static size_t compute_size(size_t mem_region_size_in_words) { |
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size_t number_of_slots = (mem_region_size_in_words / card_size_in_words); |
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return ReservedSpace::allocation_align_size_up(number_of_slots); |
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} |
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// Returns how many bytes of the heap a single byte of the Card Table corresponds to. |
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static size_t heap_map_factor() { |
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return CardTableModRefBS::card_size; |
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} |
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G1SATBCardTableLoggingModRefBS(MemRegion whole_heap); |
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virtual void initialize() { } |
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virtual void initialize(G1RegionToSpaceMapper* mapper); |
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virtual void resize_covered_region(MemRegion new_region) { ShouldNotReachHere(); } |
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// NB: if you do a whole-heap invalidation, the "usual invariant" defined |
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// above no longer applies. |
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void invalidate(MemRegion mr); |
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void write_region_work(MemRegion mr) { invalidate(mr); } |
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void write_ref_array_work(MemRegion mr) { invalidate(mr); } |
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template <DecoratorSet decorators, typename T> |
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void write_ref_field_post(T* field, oop new_val); |
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void write_ref_field_post_slow(volatile jbyte* byte); |
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// Callbacks for runtime accesses. |
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template <DecoratorSet decorators, typename BarrierSetT = G1SATBCardTableLoggingModRefBS> |
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class AccessBarrier: public ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT> { |
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typedef ModRefBarrierSet::AccessBarrier<decorators, BarrierSetT> ModRef; |
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typedef BarrierSet::AccessBarrier<decorators, BarrierSetT> Raw; |
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public: |
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// Needed for loads on non-heap weak references |
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template <typename T> |
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static oop oop_load_not_in_heap(T* addr); |
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// Needed for non-heap stores |
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template <typename T> |
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static void oop_store_not_in_heap(T* addr, oop new_value); |
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// Needed for weak references |
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static oop oop_load_in_heap_at(oop base, ptrdiff_t offset); |
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// Defensive: will catch weak oops at addresses in heap |
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template <typename T> |
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static oop oop_load_in_heap(T* addr); |
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}; |
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}; |
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template<> |
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struct BarrierSet::GetName<G1SATBCardTableLoggingModRefBS> { |
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static const BarrierSet::Name value = BarrierSet::G1SATBCTLogging; |
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}; |
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template<> |
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struct BarrierSet::GetType<BarrierSet::G1SATBCTLogging> { |
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typedef G1SATBCardTableLoggingModRefBS type; |
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}; |
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#endif // SHARE_VM_GC_G1_G1SATBCARDTABLEMODREFBS_HPP |