Mercurial > hg > truffle
annotate src/share/vm/memory/modRefBarrierSet.hpp @ 832:e7d5557ad624
Merge
author | jmasa |
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date | Thu, 02 Jul 2009 16:28:15 -0700 |
parents | 1ee8caae33af |
children | c18cbe5936b8 |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 2000-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // This kind of "BarrierSet" allows a "CollectedHeap" to detect and | |
26 // enumerate ref fields that have been modified (since the last | |
27 // enumeration), using a card table. | |
28 | |
29 class OopClosure; | |
30 class Generation; | |
31 | |
32 class ModRefBarrierSet: public BarrierSet { | |
33 public: | |
342
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34 |
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35 ModRefBarrierSet() { _kind = BarrierSet::ModRef; } |
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36 |
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37 bool is_a(BarrierSet::Name bsn) { |
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38 return bsn == BarrierSet::ModRef; |
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39 } |
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40 |
0 | 41 // Barriers only on ref writes. |
42 bool has_read_ref_barrier() { return false; } | |
43 bool has_read_prim_barrier() { return false; } | |
44 bool has_write_ref_barrier() { return true; } | |
45 bool has_write_prim_barrier() { return false; } | |
46 | |
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47 bool read_ref_needs_barrier(void* field) { return false; } |
0 | 48 bool read_prim_needs_barrier(HeapWord* field, size_t bytes) { return false; } |
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49 virtual bool write_ref_needs_barrier(void* field, oop new_val) = 0; |
0 | 50 bool write_prim_needs_barrier(HeapWord* field, size_t bytes, |
51 juint val1, juint val2) { return false; } | |
52 | |
53 void write_prim_field(oop obj, size_t offset, size_t bytes, | |
54 juint val1, juint val2) {} | |
55 | |
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56 void read_ref_field(void* field) {} |
0 | 57 void read_prim_field(HeapWord* field, size_t bytes) {} |
58 protected: | |
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59 virtual void write_ref_field_work(void* field, oop new_val) = 0; |
0 | 60 public: |
61 void write_prim_field(HeapWord* field, size_t bytes, | |
62 juint val1, juint val2) {} | |
63 | |
64 bool has_read_ref_array_opt() { return false; } | |
65 bool has_read_prim_array_opt() { return false; } | |
66 bool has_write_prim_array_opt() { return false; } | |
67 | |
68 bool has_read_region_opt() { return false; } | |
69 | |
70 | |
71 // These operations should assert false unless the correponding operation | |
72 // above returns true. | |
73 void read_ref_array(MemRegion mr) { | |
74 assert(false, "can't call"); | |
75 } | |
76 void read_prim_array(MemRegion mr) { | |
77 assert(false, "can't call"); | |
78 } | |
79 void write_prim_array(MemRegion mr) { | |
80 assert(false, "can't call"); | |
81 } | |
82 void read_region(MemRegion mr) { | |
83 assert(false, "can't call"); | |
84 } | |
85 | |
86 // Invoke "cl->do_oop" on (the address of) every possibly-modifed | |
87 // reference field in objects in "sp". If "clear" is "true", the oops | |
88 // are no longer considered possibly modified after application of the | |
89 // closure. If' "before_save_marks" is true, oops in objects allocated | |
90 // after the last call to "save_marks" on "sp" will not be considered. | |
91 virtual void mod_oop_in_space_iterate(Space* sp, OopClosure* cl, | |
92 bool clear = false, | |
93 bool before_save_marks = false) = 0; | |
94 | |
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95 // Causes all refs in "mr" to be assumed to be modified. If "whole_heap" |
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96 // is true, the caller asserts that the entire heap is being invalidated, |
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97 // which may admit an optimized implementation for some barriers. |
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98 virtual void invalidate(MemRegion mr, bool whole_heap = false) = 0; |
0 | 99 |
100 // The caller guarantees that "mr" contains no references. (Perhaps it's | |
101 // objects have been moved elsewhere.) | |
102 virtual void clear(MemRegion mr) = 0; | |
103 | |
104 // Pass along the argument to the superclass. | |
105 ModRefBarrierSet(int max_covered_regions) : | |
106 BarrierSet(max_covered_regions) {} | |
107 | |
108 #ifndef PRODUCT | |
109 // Verifies that the given region contains no modified references. | |
110 virtual void verify_clean_region(MemRegion mr) = 0; | |
111 #endif | |
112 | |
113 }; |