| /* |
| * Copyright (c) 2001, 2015, 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_PARALLEL_CARDTABLEEXTENSION_HPP |
| #define SHARE_VM_GC_PARALLEL_CARDTABLEEXTENSION_HPP |
| |
| #include "gc/shared/cardTableModRefBS.hpp" |
| |
| class MutableSpace; |
| class ObjectStartArray; |
| class PSPromotionManager; |
| class GCTaskQueue; |
| |
| class CardTableExtension : public CardTableModRefBS { |
| private: |
| // Support methods for resizing the card table. |
| // resize_commit_uncommit() returns true if the pages were committed or |
| // uncommitted |
| bool resize_commit_uncommit(int changed_region, MemRegion new_region); |
| void resize_update_card_table_entries(int changed_region, |
| MemRegion new_region); |
| void resize_update_committed_table(int changed_region, MemRegion new_region); |
| void resize_update_covered_table(int changed_region, MemRegion new_region); |
| |
| protected: |
| |
| static void verify_all_young_refs_precise_helper(MemRegion mr); |
| |
| public: |
| enum ExtendedCardValue { |
| youngergen_card = CardTableModRefBS::CT_MR_BS_last_reserved + 1, |
| verify_card = CardTableModRefBS::CT_MR_BS_last_reserved + 5 |
| }; |
| |
| CardTableExtension(MemRegion whole_heap) : |
| CardTableModRefBS( |
| whole_heap, |
| BarrierSet::FakeRtti(BarrierSet::CardTableExtension)) |
| { } |
| |
| // Scavenge support |
| void scavenge_contents_parallel(ObjectStartArray* start_array, |
| MutableSpace* sp, |
| HeapWord* space_top, |
| PSPromotionManager* pm, |
| uint stripe_number, |
| uint stripe_total); |
| |
| // Verification |
| static void verify_all_young_refs_imprecise(); |
| static void verify_all_young_refs_precise(); |
| |
| bool addr_is_marked_imprecise(void *addr); |
| bool addr_is_marked_precise(void *addr); |
| |
| void set_card_newgen(void* addr) { jbyte* p = byte_for(addr); *p = verify_card; } |
| |
| // Testers for entries |
| static bool card_is_dirty(int value) { return value == dirty_card; } |
| static bool card_is_newgen(int value) { return value == youngergen_card; } |
| static bool card_is_clean(int value) { return value == clean_card; } |
| static bool card_is_verify(int value) { return value == verify_card; } |
| |
| // Card marking |
| void inline_write_ref_field_gc(void* field, oop new_val) { |
| jbyte* byte = byte_for(field); |
| *byte = youngergen_card; |
| } |
| |
| // Adaptive size policy support |
| // Allows adjustment of the base and size of the covered regions |
| void resize_covered_region(MemRegion new_region); |
| // Finds the covered region to resize based on the start address |
| // of the covered regions. |
| void resize_covered_region_by_start(MemRegion new_region); |
| // Finds the covered region to resize based on the end address |
| // of the covered regions. |
| void resize_covered_region_by_end(int changed_region, MemRegion new_region); |
| // Finds the lowest start address of a covered region that is |
| // previous (i.e., lower index) to the covered region with index "ind". |
| HeapWord* lowest_prev_committed_start(int ind) const; |
| |
| #ifdef ASSERT |
| |
| bool is_valid_card_address(jbyte* addr) { |
| return (addr >= _byte_map) && (addr < _byte_map + _byte_map_size); |
| } |
| |
| #endif // ASSERT |
| }; |
| |
| template<> |
| struct BarrierSet::GetName<CardTableExtension> { |
| static const BarrierSet::Name value = BarrierSet::CardTableExtension; |
| }; |
| |
| #endif // SHARE_VM_GC_PARALLEL_CARDTABLEEXTENSION_HPP |