jdk8-mips64-public/hotspot: src/share/vm/memory/modRefBarrierSet.hpp@ddce0b7cee93

8072383: resolve conflicts between open and closed ports
Summary: refactor close to remove references to closed ports
Reviewed-by: kvn, simonis, sgehwolf, dholmes

     1 /*

     2  * Copyright (c) 2000, 2012, 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

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    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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    22  *

    23  */

    25 #ifndef SHARE_VM_MEMORY_MODREFBARRIERSET_HPP

    26 #define SHARE_VM_MEMORY_MODREFBARRIERSET_HPP

    28 #include "memory/barrierSet.hpp"

    30 // This kind of "BarrierSet" allows a "CollectedHeap" to detect and

    31 // enumerate ref fields that have been modified (since the last

    32 // enumeration), using a card table.

    34 class OopClosure;

    35 class Generation;

    37 class ModRefBarrierSet: public BarrierSet {

    38 public:

    40   ModRefBarrierSet() { _kind = BarrierSet::ModRef; }

    42   bool is_a(BarrierSet::Name bsn) {

    43     return bsn == BarrierSet::ModRef;

    44   }

    46   // Barriers only on ref writes.

    47   bool has_read_ref_barrier() { return false; }

    48   bool has_read_prim_barrier() { return false; }

    49   bool has_write_ref_barrier() { return true; }

    50   bool has_write_prim_barrier() { return false; }

    52   bool read_ref_needs_barrier(void* field) { return false; }

    53   bool read_prim_needs_barrier(HeapWord* field, size_t bytes) { return false; }

    54   bool write_prim_needs_barrier(HeapWord* field, size_t bytes,

    55                                 juint val1, juint val2) { return false; }

    57   void write_prim_field(oop obj, size_t offset, size_t bytes,

    58                         juint val1, juint val2) {}

    60   void read_ref_field(void* field) {}

    61   void read_prim_field(HeapWord* field, size_t bytes) {}

    62 protected:

    63   virtual void write_ref_field_work(void* field, oop new_val, bool release = false) = 0;

    64 public:

    65   void write_prim_field(HeapWord* field, size_t bytes,

    66                         juint val1, juint val2) {}

    68   bool has_read_ref_array_opt() { return false; }

    69   bool has_read_prim_array_opt() { return false; }

    70   bool has_write_prim_array_opt() { return false; }

    72   bool has_read_region_opt() { return false; }

    75   // These operations should assert false unless the correponding operation

    76   // above returns true.

    77   void read_ref_array(MemRegion mr) {

    78     assert(false, "can't call");

    79   }

    80   void read_prim_array(MemRegion mr) {

    81     assert(false, "can't call");

    82   }

    83   void write_prim_array(MemRegion mr) {

    84     assert(false, "can't call");

    85   }

    86   void read_region(MemRegion mr) {

    87     assert(false, "can't call");

    88   }

    90   // Causes all refs in "mr" to be assumed to be modified.  If "whole_heap"

    91   // is true, the caller asserts that the entire heap is being invalidated,

    92   // which may admit an optimized implementation for some barriers.

    93   virtual void invalidate(MemRegion mr, bool whole_heap = false) = 0;

    95   // The caller guarantees that "mr" contains no references.  (Perhaps it's

    96   // objects have been moved elsewhere.)

    97   virtual void clear(MemRegion mr) = 0;

    99   // Pass along the argument to the superclass.

   100   ModRefBarrierSet(int max_covered_regions) :

   101     BarrierSet(max_covered_regions) {}

   102 };

   104 #endif // SHARE_VM_MEMORY_MODREFBARRIERSET_HPP

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

src/share/vm/memory/modRefBarrierSet.hpp@ddce0b7cee93

src/share/vm/memory/modRefBarrierSet.hpp