| /* |
| * Copyright (c) 2001, 2016, 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_G1SATBCARDTABLEMODREFBS_HPP |
| #define SHARE_VM_GC_G1_G1SATBCARDTABLEMODREFBS_HPP |
| |
| #include "gc/g1/g1RegionToSpaceMapper.hpp" |
| #include "gc/shared/cardTableModRefBS.hpp" |
| #include "memory/memRegion.hpp" |
| #include "oops/oop.hpp" |
| #include "utilities/macros.hpp" |
| |
| class DirtyCardQueueSet; |
| class G1SATBCardTableLoggingModRefBS; |
| |
| // This barrier is specialized to use a logging barrier to support |
| // snapshot-at-the-beginning marking. |
| |
| class G1SATBCardTableModRefBS: public CardTableModRefBS { |
| friend class VMStructs; |
| protected: |
| enum G1CardValues { |
| g1_young_gen = CT_MR_BS_last_reserved << 1 |
| }; |
| |
| G1SATBCardTableModRefBS(MemRegion whole_heap, const BarrierSet::FakeRtti& fake_rtti); |
| ~G1SATBCardTableModRefBS() { } |
| |
| public: |
| static int g1_young_card_val() { return g1_young_gen; } |
| |
| // Add "pre_val" to a set of objects that may have been disconnected from the |
| // pre-marking object graph. |
| static void enqueue(oop pre_val); |
| |
| virtual bool has_write_ref_pre_barrier() { return true; } |
| |
| // We export this to make it available in cases where the static |
| // type of the barrier set is known. Note that it is non-virtual. |
| template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal); |
| |
| // These are the more general virtual versions. |
| inline virtual void write_ref_field_pre_work(oop* field, oop new_val); |
| inline virtual void write_ref_field_pre_work(narrowOop* field, oop new_val); |
| virtual void write_ref_field_pre_work(void* field, oop new_val) { |
| guarantee(false, "Not needed"); |
| } |
| |
| template <class T> void write_ref_array_pre_work(T* dst, int count); |
| virtual void write_ref_array_pre(oop* dst, int count, bool dest_uninitialized); |
| virtual void write_ref_array_pre(narrowOop* dst, int count, bool dest_uninitialized); |
| |
| /* |
| Claimed and deferred bits are used together in G1 during the evacuation |
| pause. These bits can have the following state transitions: |
| 1. The claimed bit can be put over any other card state. Except that |
| the "dirty -> dirty and claimed" transition is checked for in |
| G1 code and is not used. |
| 2. Deferred bit can be set only if the previous state of the card |
| was either clean or claimed. mark_card_deferred() is wait-free. |
| We do not care if the operation is be successful because if |
| it does not it will only result in duplicate entry in the update |
| buffer because of the "cache-miss". So it's not worth spinning. |
| */ |
| |
| bool is_card_claimed(size_t card_index) { |
| jbyte val = _byte_map[card_index]; |
| return (val & (clean_card_mask_val() | claimed_card_val())) == claimed_card_val(); |
| } |
| |
| inline void set_card_claimed(size_t card_index); |
| |
| void verify_g1_young_region(MemRegion mr) PRODUCT_RETURN; |
| void g1_mark_as_young(const MemRegion& mr); |
| |
| bool mark_card_deferred(size_t card_index); |
| |
| bool is_card_deferred(size_t card_index) { |
| jbyte val = _byte_map[card_index]; |
| return (val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val(); |
| } |
| virtual void write_ref_nmethod_pre(oop* dst, nmethod* nm); |
| virtual void write_ref_nmethod_post(oop* dst, nmethod* nm); |
| |
| }; |
| |
| template<> |
| struct BarrierSet::GetName<G1SATBCardTableModRefBS> { |
| static const BarrierSet::Name value = BarrierSet::G1SATBCT; |
| }; |
| |
| class G1SATBCardTableLoggingModRefBSChangedListener : public G1MappingChangedListener { |
| private: |
| G1SATBCardTableLoggingModRefBS* _card_table; |
| public: |
| G1SATBCardTableLoggingModRefBSChangedListener() : _card_table(NULL) { } |
| |
| void set_card_table(G1SATBCardTableLoggingModRefBS* card_table) { _card_table = card_table; } |
| |
| virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled); |
| }; |
| |
| // Adds card-table logging to the post-barrier. |
| // Usual invariant: all dirty cards are logged in the DirtyCardQueueSet. |
| class G1SATBCardTableLoggingModRefBS: public G1SATBCardTableModRefBS { |
| friend class G1SATBCardTableLoggingModRefBSChangedListener; |
| private: |
| G1SATBCardTableLoggingModRefBSChangedListener _listener; |
| DirtyCardQueueSet& _dcqs; |
| |
| protected: |
| virtual void write_ref_field_work(void* field, oop new_val, bool release); |
| |
| public: |
| static size_t compute_size(size_t mem_region_size_in_words) { |
| size_t number_of_slots = (mem_region_size_in_words / card_size_in_words); |
| return ReservedSpace::allocation_align_size_up(number_of_slots); |
| } |
| |
| // Returns how many bytes of the heap a single byte of the Card Table corresponds to. |
| static size_t heap_map_factor() { |
| return CardTableModRefBS::card_size; |
| } |
| |
| G1SATBCardTableLoggingModRefBS(MemRegion whole_heap); |
| |
| virtual void initialize() { } |
| virtual void initialize(G1RegionToSpaceMapper* mapper); |
| |
| virtual void resize_covered_region(MemRegion new_region) { ShouldNotReachHere(); } |
| |
| // NB: if you do a whole-heap invalidation, the "usual invariant" defined |
| // above no longer applies. |
| void invalidate(MemRegion mr); |
| |
| void write_region_work(MemRegion mr) { invalidate(mr); } |
| void write_ref_array_work(MemRegion mr) { invalidate(mr); } |
| }; |
| |
| template<> |
| struct BarrierSet::GetName<G1SATBCardTableLoggingModRefBS> { |
| static const BarrierSet::Name value = BarrierSet::G1SATBCTLogging; |
| }; |
| |
| #endif // SHARE_VM_GC_G1_G1SATBCARDTABLEMODREFBS_HPP |