--- old/src/share/vm/gc/g1/g1SATBCardTableModRefBS.hpp 2017-04-25 16:46:47.875170564 +0200 +++ /dev/null 2017-03-07 11:44:12.271151064 +0100 @@ -1,166 +0,0 @@ -/* - * 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 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 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 { - 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 { - static const BarrierSet::Name value = BarrierSet::G1SATBCTLogging; -}; - -#endif // SHARE_VM_GC_G1_G1SATBCARDTABLEMODREFBS_HPP