duke@435: /*
jmasa@1967:  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP
stefank@2314: #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP
stefank@2314: 
stefank@2314: #include "memory/cardTableModRefBS.hpp"
stefank@2314: 
duke@435: class MutableSpace;
duke@435: class ObjectStartArray;
duke@435: class PSPromotionManager;
duke@435: class GCTaskQueue;
duke@435: 
duke@435: class CardTableExtension : public CardTableModRefBS {
duke@435:  private:
duke@435:   // Support methods for resizing the card table.
jmasa@1967:   // resize_commit_uncommit() returns true if the pages were committed or
jmasa@1967:   // uncommitted
jmasa@1967:   bool resize_commit_uncommit(int changed_region, MemRegion new_region);
duke@435:   void resize_update_card_table_entries(int changed_region,
duke@435:                                         MemRegion new_region);
duke@435:   void resize_update_committed_table(int changed_region, MemRegion new_region);
duke@435:   void resize_update_covered_table(int changed_region, MemRegion new_region);
duke@435: 
duke@435:  protected:
duke@435: 
duke@435:   static void verify_all_young_refs_precise_helper(MemRegion mr);
duke@435: 
duke@435:  public:
duke@435:   enum ExtendedCardValue {
duke@435:     youngergen_card   = CardTableModRefBS::CT_MR_BS_last_reserved + 1,
duke@435:     verify_card       = CardTableModRefBS::CT_MR_BS_last_reserved + 5
duke@435:   };
duke@435: 
duke@435:   CardTableExtension(MemRegion whole_heap, int max_covered_regions) :
duke@435:     CardTableModRefBS(whole_heap, max_covered_regions) { }
duke@435: 
duke@435:   // Too risky for the 4/10/02 putback
duke@435:   // BarrierSet::Name kind() { return BarrierSet::CardTableExtension; }
duke@435: 
duke@435:   // Scavenge support
duke@435:   void scavenge_contents_parallel(ObjectStartArray* start_array,
duke@435:                                   MutableSpace* sp,
duke@435:                                   HeapWord* space_top,
duke@435:                                   PSPromotionManager* pm,
jmasa@3294:                                   uint stripe_number,
jmasa@3294:                                   uint stripe_total);
duke@435: 
duke@435:   // Verification
duke@435:   static void verify_all_young_refs_imprecise();
duke@435:   static void verify_all_young_refs_precise();
duke@435: 
duke@435:   bool addr_is_marked_imprecise(void *addr);
duke@435:   bool addr_is_marked_precise(void *addr);
duke@435: 
duke@435:   void set_card_newgen(void* addr)   { jbyte* p = byte_for(addr); *p = verify_card; }
duke@435: 
duke@435:   // Testers for entries
duke@435:   static bool card_is_dirty(int value)      { return value == dirty_card; }
duke@435:   static bool card_is_newgen(int value)     { return value == youngergen_card; }
duke@435:   static bool card_is_clean(int value)      { return value == clean_card; }
duke@435:   static bool card_is_verify(int value)     { return value == verify_card; }
duke@435: 
duke@435:   // Card marking
coleenp@548:   void inline_write_ref_field_gc(void* field, oop new_val) {
duke@435:     jbyte* byte = byte_for(field);
duke@435:     *byte = youngergen_card;
duke@435:   }
duke@435: 
duke@435:   // Adaptive size policy support
duke@435:   // Allows adjustment of the base and size of the covered regions
duke@435:   void resize_covered_region(MemRegion new_region);
duke@435:   // Finds the covered region to resize based on the start address
duke@435:   // of the covered regions.
duke@435:   void resize_covered_region_by_start(MemRegion new_region);
duke@435:   // Finds the covered region to resize based on the end address
duke@435:   // of the covered regions.
duke@435:   void resize_covered_region_by_end(int changed_region, MemRegion new_region);
duke@435:   // Finds the lowest start address of a covered region that is
duke@435:   // previous (i.e., lower index) to the covered region with index "ind".
duke@435:   HeapWord* lowest_prev_committed_start(int ind) const;
duke@435: 
duke@435: #ifdef ASSERT
duke@435: 
duke@435:   bool is_valid_card_address(jbyte* addr) {
duke@435:     return (addr >= _byte_map) && (addr < _byte_map + _byte_map_size);
duke@435:   }
duke@435: 
duke@435: #endif // ASSERT
duke@435: };
stefank@2314: 
stefank@2314: #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP