jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp@c18cbe5936b8

6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair

     1 /*

     2  * Copyright (c) 2001, 2008, 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 class MutableSpace;

    26 class ObjectStartArray;

    27 class PSPromotionManager;

    28 class GCTaskQueue;

    30 class CardTableExtension : public CardTableModRefBS {

    31  private:

    32   // Support methods for resizing the card table.

    33   void resize_commit_uncommit(int changed_region, MemRegion new_region);

    34   void resize_update_card_table_entries(int changed_region,

    35                                         MemRegion new_region);

    36   void resize_update_committed_table(int changed_region, MemRegion new_region);

    37   void resize_update_covered_table(int changed_region, MemRegion new_region);

    39  protected:

    41   static void verify_all_young_refs_precise_helper(MemRegion mr);

    43  public:

    44   enum ExtendedCardValue {

    45     youngergen_card   = CardTableModRefBS::CT_MR_BS_last_reserved + 1,

    46     verify_card       = CardTableModRefBS::CT_MR_BS_last_reserved + 5

    47   };

    49   CardTableExtension(MemRegion whole_heap, int max_covered_regions) :

    50     CardTableModRefBS(whole_heap, max_covered_regions) { }

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

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

    55   // Scavenge support

    56   void scavenge_contents(ObjectStartArray* start_array,

    57                          MutableSpace* sp,

    58                          HeapWord* space_top,

    59                          PSPromotionManager* pm);

    61   void scavenge_contents_parallel(ObjectStartArray* start_array,

    62                                   MutableSpace* sp,

    63                                   HeapWord* space_top,

    64                                   PSPromotionManager* pm,

    65                                   uint stripe_number);

    67   // Verification

    68   static void verify_all_young_refs_imprecise();

    69   static void verify_all_young_refs_precise();

    71   bool addr_is_marked_imprecise(void *addr);

    72   bool addr_is_marked_precise(void *addr);

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

    76   // Testers for entries

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

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

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

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

    82   // Card marking

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

    84     jbyte* byte = byte_for(field);

    85     *byte = youngergen_card;

    86   }

    88   // Adaptive size policy support

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

    90   void resize_covered_region(MemRegion new_region);

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

    92   // of the covered regions.

    93   void resize_covered_region_by_start(MemRegion new_region);

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

    95   // of the covered regions.

    96   void resize_covered_region_by_end(int changed_region, MemRegion new_region);

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

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

    99   HeapWord* lowest_prev_committed_start(int ind) const;

   101 #ifdef ASSERT

   103   bool is_valid_card_address(jbyte* addr) {

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

   105   }

   107 #endif // ASSERT

   108 };

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