Mercurial > hg > truffle
view src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp @ 1294:7de45b5044c3
6932270: Allow Java's ELF symtab reader to use separate debuginfo files
Reviewed-by: never
Contributed-by: Andrew Haley <aph@redhat.com>
author | never |
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date | Tue, 09 Mar 2010 11:02:39 -0800 |
parents | d1605aabd0a1 |
children | c18cbe5936b8 |
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/* * Copyright 2001-2008 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(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 };