1 /*
   2  * Copyright (c) 2001, 2013, 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  */
  24 
  25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP
  26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP
  27 
  28 #include "gc_implementation/g1/g1RegionToSpaceMapper.hpp"
  29 #include "memory/cardTableModRefBS.hpp"
  30 #include "memory/memRegion.hpp"
  31 #include "oops/oop.inline.hpp"
  32 #include "utilities/macros.hpp"
  33 
  34 class DirtyCardQueueSet;
  35 class G1SATBCardTableLoggingModRefBS;
  36 
  37 // This barrier is specialized to use a logging barrier to support
  38 // snapshot-at-the-beginning marking.
  39 
  40 class G1SATBCardTableModRefBS: public CardTableModRefBSForCTRS {
  41 protected:
  42   enum G1CardValues {
  43     g1_young_gen = CT_MR_BS_last_reserved << 1
  44   };
  45 
  46 public:
  47   static int g1_young_card_val()   { return g1_young_gen; }
  48 
  49   // Add "pre_val" to a set of objects that may have been disconnected from the
  50   // pre-marking object graph.
  51   static void enqueue(oop pre_val);
  52 
  53   G1SATBCardTableModRefBS(MemRegion whole_heap);
  54 
  55   bool is_a(BarrierSet::Name bsn) {
  56     return bsn == BarrierSet::G1SATBCT || CardTableModRefBS::is_a(bsn);
  57   }
  58 
  59   virtual bool has_write_ref_pre_barrier() { return true; }
  60 

   1 /*
   2  * Copyright (c) 2001, 2014, 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  */
  24 
  25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP
  26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP
  27 
  28 #include "gc_implementation/g1/g1RegionToSpaceMapper.hpp"
  29 #include "memory/cardTableModRefBS.hpp"
  30 #include "memory/memRegion.hpp"
  31 #include "oops/oop.inline.hpp"
  32 #include "utilities/macros.hpp"
  33 
  34 class DirtyCardQueueSet;
  35 class G1SATBCardTableLoggingModRefBS;
  36 
  37 // This barrier is specialized to use a logging barrier to support
  38 // snapshot-at-the-beginning marking.
  39 
  40 class G1SATBCardTableModRefBS: public CardTableModRefBS {
  41 protected:
  42   enum G1CardValues {
  43     g1_young_gen = CT_MR_BS_last_reserved << 1
  44   };
  45 
  46 public:
  47   static int g1_young_card_val()   { return g1_young_gen; }
  48 
  49   // Add "pre_val" to a set of objects that may have been disconnected from the
  50   // pre-marking object graph.
  51   static void enqueue(oop pre_val);
  52 
  53   G1SATBCardTableModRefBS(MemRegion whole_heap);
  54 
  55   bool is_a(BarrierSet::Name bsn) {
  56     return bsn == BarrierSet::G1SATBCT || CardTableModRefBS::is_a(bsn);
  57   }
  58 
  59   virtual bool has_write_ref_pre_barrier() { return true; }
  60