jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.hpp@8aae2050e83e

7092309: G1: introduce old region set
Summary: Keep track of all the old regions in the heap with a heap region set.
Reviewed-by: brutisso, johnc

     1 /*

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     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

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    25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP

    26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP

    28 #include "memory/cardTableModRefBS.hpp"

    29 #include "memory/memRegion.hpp"

    30 #include "oops/oop.inline.hpp"

    32 #ifndef SERIALGC

    34 class DirtyCardQueueSet;

    36 // This barrier is specialized to use a logging barrier to support

    37 // snapshot-at-the-beginning marking.

    39 class G1SATBCardTableModRefBS: public CardTableModRefBSForCTRS {

    40 public:

    41   // Add "pre_val" to a set of objects that may have been disconnected from the

    42   // pre-marking object graph.

    43   static void enqueue(oop pre_val);

    45   G1SATBCardTableModRefBS(MemRegion whole_heap,

    46                           int max_covered_regions);

    48   bool is_a(BarrierSet::Name bsn) {

    49     return bsn == BarrierSet::G1SATBCT || CardTableModRefBS::is_a(bsn);

    50   }

    52   virtual bool has_write_ref_pre_barrier() { return true; }

    54   // This notes that we don't need to access any BarrierSet data

    55   // structures, so this can be called from a static context.

    56   template <class T> static void write_ref_field_pre_static(T* field, oop newVal) {

    57     T heap_oop = oopDesc::load_heap_oop(field);

    58     if (!oopDesc::is_null(heap_oop)) {

    59       enqueue(oopDesc::decode_heap_oop(heap_oop));

    60     }

    61   }

    63   // We export this to make it available in cases where the static

    64   // type of the barrier set is known.  Note that it is non-virtual.

    65   template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal) {

    66     write_ref_field_pre_static(field, newVal);

    67   }

    69   // These are the more general virtual versions.

    70   virtual void write_ref_field_pre_work(oop* field, oop new_val) {

    71     inline_write_ref_field_pre(field, new_val);

    72   }

    73   virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) {

    74     inline_write_ref_field_pre(field, new_val);

    75   }

    76   virtual void write_ref_field_pre_work(void* field, oop new_val) {

    77     guarantee(false, "Not needed");

    78   }

    80   template <class T> void write_ref_array_pre_work(T* dst, int count);

    81   virtual void write_ref_array_pre(oop* dst, int count, bool dest_uninitialized) {

    82     if (!dest_uninitialized) {

    83       write_ref_array_pre_work(dst, count);

    84     }

    85   }

    86   virtual void write_ref_array_pre(narrowOop* dst, int count, bool dest_uninitialized) {

    87     if (!dest_uninitialized) {

    88       write_ref_array_pre_work(dst, count);

    89     }

    90   }

    91 };

    93 // Adds card-table logging to the post-barrier.

    94 // Usual invariant: all dirty cards are logged in the DirtyCardQueueSet.

    95 class G1SATBCardTableLoggingModRefBS: public G1SATBCardTableModRefBS {

    96  private:

    97   DirtyCardQueueSet& _dcqs;

    98  public:

    99   G1SATBCardTableLoggingModRefBS(MemRegion whole_heap,

   100                                  int max_covered_regions);

   102   bool is_a(BarrierSet::Name bsn) {

   103     return bsn == BarrierSet::G1SATBCTLogging ||

   104       G1SATBCardTableModRefBS::is_a(bsn);

   105   }

   107   void write_ref_field_work(void* field, oop new_val);

   109   // Can be called from static contexts.

   110   static void write_ref_field_static(void* field, oop new_val);

   112   // NB: if you do a whole-heap invalidation, the "usual invariant" defined

   113   // above no longer applies.

   114   void invalidate(MemRegion mr, bool whole_heap = false);

   116   void write_region_work(MemRegion mr)    { invalidate(mr); }

   117   void write_ref_array_work(MemRegion mr) { invalidate(mr); }

   120 };

   123 #endif // SERIALGC

   125 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP

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