Mercurial > hg > truffle
annotate src/share/vm/memory/modRefBarrierSet.hpp @ 5343:20c14eb46238
added GraalOptions.CheckcastMinHintHitProbability to better guide use of hints for checkcasts
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 02 May 2012 17:09:00 +0200 |
parents | 063382f9b575 |
children | da91efe96a93 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_MEMORY_MODREFBARRIERSET_HPP |
26 #define SHARE_VM_MEMORY_MODREFBARRIERSET_HPP | |
27 | |
28 #include "memory/barrierSet.hpp" | |
29 | |
0 | 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. | |
33 | |
34 class OopClosure; | |
35 class Generation; | |
36 | |
37 class ModRefBarrierSet: public BarrierSet { | |
38 public: | |
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39 |
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40 ModRefBarrierSet() { _kind = BarrierSet::ModRef; } |
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41 |
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42 bool is_a(BarrierSet::Name bsn) { |
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43 return bsn == BarrierSet::ModRef; |
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44 } |
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45 |
0 | 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; } | |
51 | |
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52 bool read_ref_needs_barrier(void* field) { return false; } |
0 | 53 bool read_prim_needs_barrier(HeapWord* field, size_t bytes) { return false; } |
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54 virtual bool write_ref_needs_barrier(void* field, oop new_val) = 0; |
0 | 55 bool write_prim_needs_barrier(HeapWord* field, size_t bytes, |
56 juint val1, juint val2) { return false; } | |
57 | |
58 void write_prim_field(oop obj, size_t offset, size_t bytes, | |
59 juint val1, juint val2) {} | |
60 | |
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61 void read_ref_field(void* field) {} |
0 | 62 void read_prim_field(HeapWord* field, size_t bytes) {} |
63 protected: | |
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64 virtual void write_ref_field_work(void* field, oop new_val) = 0; |
0 | 65 public: |
66 void write_prim_field(HeapWord* field, size_t bytes, | |
67 juint val1, juint val2) {} | |
68 | |
69 bool has_read_ref_array_opt() { return false; } | |
70 bool has_read_prim_array_opt() { return false; } | |
71 bool has_write_prim_array_opt() { return false; } | |
72 | |
73 bool has_read_region_opt() { return false; } | |
74 | |
75 | |
76 // These operations should assert false unless the correponding operation | |
77 // above returns true. | |
78 void read_ref_array(MemRegion mr) { | |
79 assert(false, "can't call"); | |
80 } | |
81 void read_prim_array(MemRegion mr) { | |
82 assert(false, "can't call"); | |
83 } | |
84 void write_prim_array(MemRegion mr) { | |
85 assert(false, "can't call"); | |
86 } | |
87 void read_region(MemRegion mr) { | |
88 assert(false, "can't call"); | |
89 } | |
90 | |
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91 // Causes all refs in "mr" to be assumed to be modified. If "whole_heap" |
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92 // is true, the caller asserts that the entire heap is being invalidated, |
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93 // which may admit an optimized implementation for some barriers. |
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94 virtual void invalidate(MemRegion mr, bool whole_heap = false) = 0; |
0 | 95 |
96 // The caller guarantees that "mr" contains no references. (Perhaps it's | |
97 // objects have been moved elsewhere.) | |
98 virtual void clear(MemRegion mr) = 0; | |
99 | |
100 // Pass along the argument to the superclass. | |
101 ModRefBarrierSet(int max_covered_regions) : | |
102 BarrierSet(max_covered_regions) {} | |
103 }; | |
1972 | 104 |
105 #endif // SHARE_VM_MEMORY_MODREFBARRIERSET_HPP |