src/hotspot/share/gc/shared/modRefBarrierSet.hpp
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
changeset 47216 71c04702a3d5
parent 42598 hotspot/src/share/vm/gc/shared/modRefBarrierSet.hpp@45562c0473fb
child 47658 c2b7fb8e5144
permissions -rw-r--r--
8187443: Forest Consolidation: Move files to unified layout Reviewed-by: darcy, ihse
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
     1
/*
28830
a252e278c3d9 8064947: Clean up BarrierSet ctor/dtor
jprovino
parents: 27687
diff changeset
     2
 * Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
     3
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
489c9b5090e2 Initial load
duke
parents:
diff changeset
     4
 *
489c9b5090e2 Initial load
duke
parents:
diff changeset
     5
 * This code is free software; you can redistribute it and/or modify it
489c9b5090e2 Initial load
duke
parents:
diff changeset
     6
 * under the terms of the GNU General Public License version 2 only, as
489c9b5090e2 Initial load
duke
parents:
diff changeset
     7
 * published by the Free Software Foundation.
489c9b5090e2 Initial load
duke
parents:
diff changeset
     8
 *
489c9b5090e2 Initial load
duke
parents:
diff changeset
     9
 * This code is distributed in the hope that it will be useful, but WITHOUT
489c9b5090e2 Initial load
duke
parents:
diff changeset
    10
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
489c9b5090e2 Initial load
duke
parents:
diff changeset
    11
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
489c9b5090e2 Initial load
duke
parents:
diff changeset
    12
 * version 2 for more details (a copy is included in the LICENSE file that
489c9b5090e2 Initial load
duke
parents:
diff changeset
    13
 * accompanied this code).
489c9b5090e2 Initial load
duke
parents:
diff changeset
    14
 *
489c9b5090e2 Initial load
duke
parents:
diff changeset
    15
 * You should have received a copy of the GNU General Public License version
489c9b5090e2 Initial load
duke
parents:
diff changeset
    16
 * 2 along with this work; if not, write to the Free Software Foundation,
489c9b5090e2 Initial load
duke
parents:
diff changeset
    17
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
489c9b5090e2 Initial load
duke
parents:
diff changeset
    18
 *
5547
f4b087cbb361 6941466: Oracle rebranding changes for Hotspot repositories
trims
parents: 1388
diff changeset
    19
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
f4b087cbb361 6941466: Oracle rebranding changes for Hotspot repositories
trims
parents: 1388
diff changeset
    20
 * or visit www.oracle.com if you need additional information or have any
f4b087cbb361 6941466: Oracle rebranding changes for Hotspot repositories
trims
parents: 1388
diff changeset
    21
 * questions.
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
    22
 *
489c9b5090e2 Initial load
duke
parents:
diff changeset
    23
 */
489c9b5090e2 Initial load
duke
parents:
diff changeset
    24
30764
fec48bf5a827 8079792: GC directory structure cleanup
pliden
parents: 29325
diff changeset
    25
#ifndef SHARE_VM_GC_SHARED_MODREFBARRIERSET_HPP
fec48bf5a827 8079792: GC directory structure cleanup
pliden
parents: 29325
diff changeset
    26
#define SHARE_VM_GC_SHARED_MODREFBARRIERSET_HPP
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 5547
diff changeset
    27
30764
fec48bf5a827 8079792: GC directory structure cleanup
pliden
parents: 29325
diff changeset
    28
#include "gc/shared/barrierSet.hpp"
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 5547
diff changeset
    29
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
    30
// This kind of "BarrierSet" allows a "CollectedHeap" to detect and
489c9b5090e2 Initial load
duke
parents:
diff changeset
    31
// enumerate ref fields that have been modified (since the last
489c9b5090e2 Initial load
duke
parents:
diff changeset
    32
// enumeration), using a card table.
489c9b5090e2 Initial load
duke
parents:
diff changeset
    33
489c9b5090e2 Initial load
duke
parents:
diff changeset
    34
class OopClosure;
489c9b5090e2 Initial load
duke
parents:
diff changeset
    35
class Generation;
489c9b5090e2 Initial load
duke
parents:
diff changeset
    36
489c9b5090e2 Initial load
duke
parents:
diff changeset
    37
class ModRefBarrierSet: public BarrierSet {
489c9b5090e2 Initial load
duke
parents:
diff changeset
    38
public:
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents: 360
diff changeset
    39
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
    40
  // Barriers only on ref writes.
489c9b5090e2 Initial load
duke
parents:
diff changeset
    41
  bool has_read_ref_barrier() { return false; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
    42
  bool has_read_prim_barrier() { return false; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
    43
  bool has_write_ref_barrier() { return true; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
    44
  bool has_write_prim_barrier() { return false; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
    45
360
21d113ecbf6a 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents: 1
diff changeset
    46
  bool read_ref_needs_barrier(void* field) { return false; }
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
    47
  bool read_prim_needs_barrier(HeapWord* field, size_t bytes) { return false; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
    48
  bool write_prim_needs_barrier(HeapWord* field, size_t bytes,
489c9b5090e2 Initial load
duke
parents:
diff changeset
    49
                                juint val1, juint val2) { return false; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
    50
489c9b5090e2 Initial load
duke
parents:
diff changeset
    51
  void write_prim_field(oop obj, size_t offset, size_t bytes,
489c9b5090e2 Initial load
duke
parents:
diff changeset
    52
                        juint val1, juint val2) {}
489c9b5090e2 Initial load
duke
parents:
diff changeset
    53
360
21d113ecbf6a 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents: 1
diff changeset
    54
  void read_ref_field(void* field) {}
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
    55
  void read_prim_field(HeapWord* field, size_t bytes) {}
28830
a252e278c3d9 8064947: Clean up BarrierSet ctor/dtor
jprovino
parents: 27687
diff changeset
    56
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
    57
protected:
28830
a252e278c3d9 8064947: Clean up BarrierSet ctor/dtor
jprovino
parents: 27687
diff changeset
    58
29325
0e86e64c66e5 8069016: Add BarrierSet downcast support
kbarrett
parents: 28830
diff changeset
    59
  ModRefBarrierSet(const BarrierSet::FakeRtti& fake_rtti)
0e86e64c66e5 8069016: Add BarrierSet downcast support
kbarrett
parents: 28830
diff changeset
    60
    : BarrierSet(fake_rtti.add_tag(BarrierSet::ModRef)) { }
28830
a252e278c3d9 8064947: Clean up BarrierSet ctor/dtor
jprovino
parents: 27687
diff changeset
    61
  ~ModRefBarrierSet() { }
a252e278c3d9 8064947: Clean up BarrierSet ctor/dtor
jprovino
parents: 27687
diff changeset
    62
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
    63
public:
489c9b5090e2 Initial load
duke
parents:
diff changeset
    64
  void write_prim_field(HeapWord* field, size_t bytes,
489c9b5090e2 Initial load
duke
parents:
diff changeset
    65
                        juint val1, juint val2) {}
489c9b5090e2 Initial load
duke
parents:
diff changeset
    66
489c9b5090e2 Initial load
duke
parents:
diff changeset
    67
  bool has_read_ref_array_opt() { return false; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
    68
  bool has_read_prim_array_opt() { return false; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
    69
  bool has_write_prim_array_opt() { return false; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
    70
489c9b5090e2 Initial load
duke
parents:
diff changeset
    71
  bool has_read_region_opt() { return false; }
489c9b5090e2 Initial load
duke
parents:
diff changeset
    72
489c9b5090e2 Initial load
duke
parents:
diff changeset
    73
22551
9bf46d16dcc6 8025856: Fix typos in the GC code
jwilhelm
parents: 13728
diff changeset
    74
  // These operations should assert false unless the corresponding operation
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
    75
  // above returns true.
489c9b5090e2 Initial load
duke
parents:
diff changeset
    76
  void read_ref_array(MemRegion mr) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
    77
    assert(false, "can't call");
489c9b5090e2 Initial load
duke
parents:
diff changeset
    78
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
    79
  void read_prim_array(MemRegion mr) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
    80
    assert(false, "can't call");
489c9b5090e2 Initial load
duke
parents:
diff changeset
    81
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
    82
  void write_prim_array(MemRegion mr) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
    83
    assert(false, "can't call");
489c9b5090e2 Initial load
duke
parents:
diff changeset
    84
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
    85
  void read_region(MemRegion mr) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
    86
    assert(false, "can't call");
489c9b5090e2 Initial load
duke
parents:
diff changeset
    87
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
    88
42598
45562c0473fb 8166898: G1SATBCardTableLoggingModRefBS::invalidate() incorrect with whole_heap == true
lmesnik
parents: 32612
diff changeset
    89
  // Causes all refs in "mr" to be assumed to be modified.
45562c0473fb 8166898: G1SATBCardTableLoggingModRefBS::invalidate() incorrect with whole_heap == true
lmesnik
parents: 32612
diff changeset
    90
  virtual void invalidate(MemRegion mr) = 0;
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
    91
489c9b5090e2 Initial load
duke
parents:
diff changeset
    92
  // The caller guarantees that "mr" contains no references.  (Perhaps it's
489c9b5090e2 Initial load
duke
parents:
diff changeset
    93
  // objects have been moved elsewhere.)
489c9b5090e2 Initial load
duke
parents:
diff changeset
    94
  virtual void clear(MemRegion mr) = 0;
489c9b5090e2 Initial load
duke
parents:
diff changeset
    95
};
7397
5b173b4ca846 6989984: Use standard include model for Hospot
stefank
parents: 5547
diff changeset
    96
29325
0e86e64c66e5 8069016: Add BarrierSet downcast support
kbarrett
parents: 28830
diff changeset
    97
template<>
0e86e64c66e5 8069016: Add BarrierSet downcast support
kbarrett
parents: 28830
diff changeset
    98
struct BarrierSet::GetName<ModRefBarrierSet> {
0e86e64c66e5 8069016: Add BarrierSet downcast support
kbarrett
parents: 28830
diff changeset
    99
  static const BarrierSet::Name value = BarrierSet::ModRef;
0e86e64c66e5 8069016: Add BarrierSet downcast support
kbarrett
parents: 28830
diff changeset
   100
};
0e86e64c66e5 8069016: Add BarrierSet downcast support
kbarrett
parents: 28830
diff changeset
   101
30764
fec48bf5a827 8079792: GC directory structure cleanup
pliden
parents: 29325
diff changeset
   102
#endif // SHARE_VM_GC_SHARED_MODREFBARRIERSET_HPP