Mercurial > hg > graal-jvmci-8
diff src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | ba764ed4b6f2 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,108 @@ +/* + * Copyright 2001-2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +class MutableSpace; +class ObjectStartArray; +class PSPromotionManager; +class GCTaskQueue; + +class CardTableExtension : public CardTableModRefBS { + private: + // Support methods for resizing the card table. + void 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, int max_covered_regions) : + CardTableModRefBS(whole_heap, max_covered_regions) { } + + // Too risky for the 4/10/02 putback + // BarrierSet::Name kind() { return BarrierSet::CardTableExtension; } + + // Scavenge support + void scavenge_contents(ObjectStartArray* start_array, + MutableSpace* sp, + HeapWord* space_top, + PSPromotionManager* pm); + + void scavenge_contents_parallel(ObjectStartArray* start_array, + MutableSpace* sp, + HeapWord* space_top, + PSPromotionManager* pm, + uint stripe_number); + + // 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(oop* 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 +};