jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.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, 2007, 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 SERIALGC

    27 class DirtyCardQueueSet;

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

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

    32 class G1SATBCardTableModRefBS: public CardTableModRefBSForCTRS {

    33 private:

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

    35   // pre-marking object graph.

    36   static void enqueue(oop pre_val);

    38 public:

    39   G1SATBCardTableModRefBS(MemRegion whole_heap,

    40                           int max_covered_regions);

    42   bool is_a(BarrierSet::Name bsn) {

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

    44   }

    46   virtual bool has_write_ref_pre_barrier() { return true; }

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

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

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

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

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

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

    54     }

    55   }

    57   // When we know the current java thread:

    58   template <class T> static void write_ref_field_pre_static(T* field, oop newVal,

    59                                                             JavaThread* jt);

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

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

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

    64     write_ref_field_pre_static(field, newVal);

    65   }

    67   // These are the more general virtual versions.

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

    69     inline_write_ref_field_pre(field, new_val);

    70   }

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

    72     inline_write_ref_field_pre(field, new_val);

    73   }

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

    75     guarantee(false, "Not needed");

    76   }

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

    79   virtual void write_ref_array_pre(oop* dst, int count) {

    80     write_ref_array_pre_work(dst, count);

    81   }

    82   virtual void write_ref_array_pre(narrowOop* dst, int count) {

    83     write_ref_array_pre_work(dst, count);

    84   }

    85 };

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

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

    89 class G1SATBCardTableLoggingModRefBS: public G1SATBCardTableModRefBS {

    90  private:

    91   DirtyCardQueueSet& _dcqs;

    92  public:

    93   G1SATBCardTableLoggingModRefBS(MemRegion whole_heap,

    94                                  int max_covered_regions);

    96   bool is_a(BarrierSet::Name bsn) {

    97     return bsn == BarrierSet::G1SATBCTLogging ||

    98       G1SATBCardTableModRefBS::is_a(bsn);

    99   }

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

   103   // Can be called from static contexts.

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

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

   107   // above no longer applies.

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

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

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

   114 };

   117 #endif // SERIALGC

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