1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,113 @@
1.4 +/*
1.5 + * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP
1.29 +#define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP
1.30 +
1.31 +#include "memory/cardTableModRefBS.hpp"
1.32 +
1.33 +class MutableSpace;
1.34 +class ObjectStartArray;
1.35 +class PSPromotionManager;
1.36 +class GCTaskQueue;
1.37 +
1.38 +class CardTableExtension : public CardTableModRefBS {
1.39 + private:
1.40 + // Support methods for resizing the card table.
1.41 + // resize_commit_uncommit() returns true if the pages were committed or
1.42 + // uncommitted
1.43 + bool resize_commit_uncommit(int changed_region, MemRegion new_region);
1.44 + void resize_update_card_table_entries(int changed_region,
1.45 + MemRegion new_region);
1.46 + void resize_update_committed_table(int changed_region, MemRegion new_region);
1.47 + void resize_update_covered_table(int changed_region, MemRegion new_region);
1.48 +
1.49 + protected:
1.50 +
1.51 + static void verify_all_young_refs_precise_helper(MemRegion mr);
1.52 +
1.53 + public:
1.54 + enum ExtendedCardValue {
1.55 + youngergen_card = CardTableModRefBS::CT_MR_BS_last_reserved + 1,
1.56 + verify_card = CardTableModRefBS::CT_MR_BS_last_reserved + 5
1.57 + };
1.58 +
1.59 + CardTableExtension(MemRegion whole_heap, int max_covered_regions) :
1.60 + CardTableModRefBS(whole_heap, max_covered_regions) { }
1.61 +
1.62 + // Too risky for the 4/10/02 putback
1.63 + // BarrierSet::Name kind() { return BarrierSet::CardTableExtension; }
1.64 +
1.65 + // Scavenge support
1.66 + void scavenge_contents_parallel(ObjectStartArray* start_array,
1.67 + MutableSpace* sp,
1.68 + HeapWord* space_top,
1.69 + PSPromotionManager* pm,
1.70 + uint stripe_number,
1.71 + uint stripe_total);
1.72 +
1.73 + // Verification
1.74 + static void verify_all_young_refs_imprecise();
1.75 + static void verify_all_young_refs_precise();
1.76 +
1.77 + bool addr_is_marked_imprecise(void *addr);
1.78 + bool addr_is_marked_precise(void *addr);
1.79 +
1.80 + void set_card_newgen(void* addr) { jbyte* p = byte_for(addr); *p = verify_card; }
1.81 +
1.82 + // Testers for entries
1.83 + static bool card_is_dirty(int value) { return value == dirty_card; }
1.84 + static bool card_is_newgen(int value) { return value == youngergen_card; }
1.85 + static bool card_is_clean(int value) { return value == clean_card; }
1.86 + static bool card_is_verify(int value) { return value == verify_card; }
1.87 +
1.88 + // Card marking
1.89 + void inline_write_ref_field_gc(void* field, oop new_val) {
1.90 + jbyte* byte = byte_for(field);
1.91 + *byte = youngergen_card;
1.92 + }
1.93 +
1.94 + // Adaptive size policy support
1.95 + // Allows adjustment of the base and size of the covered regions
1.96 + void resize_covered_region(MemRegion new_region);
1.97 + // Finds the covered region to resize based on the start address
1.98 + // of the covered regions.
1.99 + void resize_covered_region_by_start(MemRegion new_region);
1.100 + // Finds the covered region to resize based on the end address
1.101 + // of the covered regions.
1.102 + void resize_covered_region_by_end(int changed_region, MemRegion new_region);
1.103 + // Finds the lowest start address of a covered region that is
1.104 + // previous (i.e., lower index) to the covered region with index "ind".
1.105 + HeapWord* lowest_prev_committed_start(int ind) const;
1.106 +
1.107 +#ifdef ASSERT
1.108 +
1.109 + bool is_valid_card_address(jbyte* addr) {
1.110 + return (addr >= _byte_map) && (addr < _byte_map + _byte_map_size);
1.111 + }
1.112 +
1.113 +#endif // ASSERT
1.114 +};
1.115 +
1.116 +#endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP
