jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp@92ef81e2f571

8003557: NPG: Klass* const k should be const Klass* k.
Summary: With NPG, const KlassOop klass which is in fact a definition converted to Klass* const, which is not the original intention. The right usage is converting them to const Klass*.
Reviewed-by: coleenp, kvn
Contributed-by: yumin.qi@oracle.com

     1 /*

     2  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #ifndef SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP

    28 #include "memory/cardTableModRefBS.hpp"

    30 class MutableSpace;

    31 class ObjectStartArray;

    32 class PSPromotionManager;

    33 class GCTaskQueue;

    35 class CardTableExtension : public CardTableModRefBS {

    36  private:

    37   // Support methods for resizing the card table.

    38   // resize_commit_uncommit() returns true if the pages were committed or

    39   // uncommitted

    40   bool resize_commit_uncommit(int changed_region, MemRegion new_region);

    41   void resize_update_card_table_entries(int changed_region,

    42                                         MemRegion new_region);

    43   void resize_update_committed_table(int changed_region, MemRegion new_region);

    44   void resize_update_covered_table(int changed_region, MemRegion new_region);

    46  protected:

    48   static void verify_all_young_refs_precise_helper(MemRegion mr);

    50  public:

    51   enum ExtendedCardValue {

    52     youngergen_card   = CardTableModRefBS::CT_MR_BS_last_reserved + 1,

    53     verify_card       = CardTableModRefBS::CT_MR_BS_last_reserved + 5

    54   };

    56   CardTableExtension(MemRegion whole_heap, int max_covered_regions) :

    57     CardTableModRefBS(whole_heap, max_covered_regions) { }

    59   // Too risky for the 4/10/02 putback

    60   // BarrierSet::Name kind() { return BarrierSet::CardTableExtension; }

    62   // Scavenge support

    63   void scavenge_contents_parallel(ObjectStartArray* start_array,

    64                                   MutableSpace* sp,

    65                                   HeapWord* space_top,

    66                                   PSPromotionManager* pm,

    67                                   uint stripe_number,

    68                                   uint stripe_total);

    70   // Verification

    71   static void verify_all_young_refs_imprecise();

    72   static void verify_all_young_refs_precise();

    74   bool addr_is_marked_imprecise(void *addr);

    75   bool addr_is_marked_precise(void *addr);

    77   void set_card_newgen(void* addr)   { jbyte* p = byte_for(addr); *p = verify_card; }

    79   // Testers for entries

    80   static bool card_is_dirty(int value)      { return value == dirty_card; }

    81   static bool card_is_newgen(int value)     { return value == youngergen_card; }

    82   static bool card_is_clean(int value)      { return value == clean_card; }

    83   static bool card_is_verify(int value)     { return value == verify_card; }

    85   // Card marking

    86   void inline_write_ref_field_gc(void* field, oop new_val) {

    87     jbyte* byte = byte_for(field);

    88     *byte = youngergen_card;

    89   }

    91   // Adaptive size policy support

    92   // Allows adjustment of the base and size of the covered regions

    93   void resize_covered_region(MemRegion new_region);

    94   // Finds the covered region to resize based on the start address

    95   // of the covered regions.

    96   void resize_covered_region_by_start(MemRegion new_region);

    97   // Finds the covered region to resize based on the end address

    98   // of the covered regions.

    99   void resize_covered_region_by_end(int changed_region, MemRegion new_region);

   100   // Finds the lowest start address of a covered region that is

   101   // previous (i.e., lower index) to the covered region with index "ind".

   102   HeapWord* lowest_prev_committed_start(int ind) const;

   104 #ifdef ASSERT

   106   bool is_valid_card_address(jbyte* addr) {

   107     return (addr >= _byte_map) && (addr < _byte_map + _byte_map_size);

   108   }

   110 #endif // ASSERT

   111 };

   113 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp@92ef81e2f571

src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp