Mercurial > hg > graal-compiler
annotate src/share/vm/memory/barrierSet.hpp @ 1782:f353275af40e
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Reviewed-by: kvn, twisti
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date | Thu, 02 Sep 2010 11:40:02 -0700 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2008, Oracle and/or its affiliates. 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 | |
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12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
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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 * | |
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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 | |
25 // This class provides the interface between a barrier implementation and | |
26 // the rest of the system. | |
27 | |
28 class BarrierSet: public CHeapObj { | |
29 friend class VMStructs; | |
30 public: | |
31 enum Name { | |
32 ModRef, | |
33 CardTableModRef, | |
34 CardTableExtension, | |
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35 G1SATBCT, |
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36 G1SATBCTLogging, |
0 | 37 Other, |
38 Uninit | |
39 }; | |
40 | |
41 protected: | |
42 int _max_covered_regions; | |
43 Name _kind; | |
44 | |
45 public: | |
46 | |
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47 BarrierSet() { _kind = Uninit; } |
0 | 48 // To get around prohibition on RTTI. |
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49 BarrierSet::Name kind() { return _kind; } |
0 | 50 virtual bool is_a(BarrierSet::Name bsn) = 0; |
51 | |
52 // These operations indicate what kind of barriers the BarrierSet has. | |
53 virtual bool has_read_ref_barrier() = 0; | |
54 virtual bool has_read_prim_barrier() = 0; | |
55 virtual bool has_write_ref_barrier() = 0; | |
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56 virtual bool has_write_ref_pre_barrier() = 0; |
0 | 57 virtual bool has_write_prim_barrier() = 0; |
58 | |
59 // These functions indicate whether a particular access of the given | |
60 // kinds requires a barrier. | |
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61 virtual bool read_ref_needs_barrier(void* field) = 0; |
0 | 62 virtual bool read_prim_needs_barrier(HeapWord* field, size_t bytes) = 0; |
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63 virtual bool write_ref_needs_barrier(void* field, oop new_val) = 0; |
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64 virtual bool write_prim_needs_barrier(HeapWord* field, size_t bytes, |
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65 juint val1, juint val2) = 0; |
0 | 66 |
67 // The first four operations provide a direct implementation of the | |
68 // barrier set. An interpreter loop, for example, could call these | |
69 // directly, as appropriate. | |
70 | |
71 // Invoke the barrier, if any, necessary when reading the given ref field. | |
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72 virtual void read_ref_field(void* field) = 0; |
0 | 73 |
74 // Invoke the barrier, if any, necessary when reading the given primitive | |
75 // "field" of "bytes" bytes in "obj". | |
76 virtual void read_prim_field(HeapWord* field, size_t bytes) = 0; | |
77 | |
78 // Invoke the barrier, if any, necessary when writing "new_val" into the | |
79 // ref field at "offset" in "obj". | |
80 // (For efficiency reasons, this operation is specialized for certain | |
81 // barrier types. Semantically, it should be thought of as a call to the | |
82 // virtual "_work" function below, which must implement the barrier.) | |
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83 // First the pre-write versions... |
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84 template <class T> inline void write_ref_field_pre(T* field, oop new_val); |
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85 private: |
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86 // Keep this private so as to catch violations at build time. |
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87 virtual void write_ref_field_pre_work( void* field, oop new_val) { guarantee(false, "Not needed"); }; |
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88 protected: |
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89 virtual void write_ref_field_pre_work( oop* field, oop new_val) {}; |
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90 virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) {}; |
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91 public: |
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92 |
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93 // ...then the post-write version. |
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94 inline void write_ref_field(void* field, oop new_val); |
0 | 95 protected: |
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96 virtual void write_ref_field_work(void* field, oop new_val) = 0; |
0 | 97 public: |
98 | |
99 // Invoke the barrier, if any, necessary when writing the "bytes"-byte | |
100 // value(s) "val1" (and "val2") into the primitive "field". | |
101 virtual void write_prim_field(HeapWord* field, size_t bytes, | |
102 juint val1, juint val2) = 0; | |
103 | |
104 // Operations on arrays, or general regions (e.g., for "clone") may be | |
105 // optimized by some barriers. | |
106 | |
107 // The first six operations tell whether such an optimization exists for | |
108 // the particular barrier. | |
109 virtual bool has_read_ref_array_opt() = 0; | |
110 virtual bool has_read_prim_array_opt() = 0; | |
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111 virtual bool has_write_ref_array_pre_opt() { return true; } |
0 | 112 virtual bool has_write_ref_array_opt() = 0; |
113 virtual bool has_write_prim_array_opt() = 0; | |
114 | |
115 virtual bool has_read_region_opt() = 0; | |
116 virtual bool has_write_region_opt() = 0; | |
117 | |
118 // These operations should assert false unless the correponding operation | |
119 // above returns true. Otherwise, they should perform an appropriate | |
120 // barrier for an array whose elements are all in the given memory region. | |
121 virtual void read_ref_array(MemRegion mr) = 0; | |
122 virtual void read_prim_array(MemRegion mr) = 0; | |
123 | |
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124 // Below length is the # array elements being written |
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125 virtual void write_ref_array_pre( oop* dst, int length) {} |
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126 virtual void write_ref_array_pre(narrowOop* dst, int length) {} |
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127 // Below count is the # array elements being written, starting |
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128 // at the address "start", which may not necessarily be HeapWord-aligned |
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129 inline void write_ref_array(HeapWord* start, size_t count); |
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130 |
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131 // Static versions, suitable for calling from generated code; |
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132 // count is # array elements being written, starting with "start", |
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133 // which may not necessarily be HeapWord-aligned. |
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134 static void static_write_ref_array_pre(HeapWord* start, size_t count); |
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135 static void static_write_ref_array_post(HeapWord* start, size_t count); |
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136 |
0 | 137 protected: |
138 virtual void write_ref_array_work(MemRegion mr) = 0; | |
139 public: | |
140 virtual void write_prim_array(MemRegion mr) = 0; | |
141 | |
142 virtual void read_region(MemRegion mr) = 0; | |
143 | |
144 // (For efficiency reasons, this operation is specialized for certain | |
145 // barrier types. Semantically, it should be thought of as a call to the | |
146 // virtual "_work" function below, which must implement the barrier.) | |
147 inline void write_region(MemRegion mr); | |
148 protected: | |
149 virtual void write_region_work(MemRegion mr) = 0; | |
150 public: | |
151 | |
152 // Some barrier sets create tables whose elements correspond to parts of | |
153 // the heap; the CardTableModRefBS is an example. Such barrier sets will | |
154 // normally reserve space for such tables, and commit parts of the table | |
155 // "covering" parts of the heap that are committed. The constructor is | |
156 // passed the maximum number of independently committable subregions to | |
157 // be covered, and the "resize_covoered_region" function allows the | |
158 // sub-parts of the heap to inform the barrier set of changes of their | |
159 // sizes. | |
160 BarrierSet(int max_covered_regions) : | |
161 _max_covered_regions(max_covered_regions) {} | |
162 | |
163 // Inform the BarrierSet that the the covered heap region that starts | |
164 // with "base" has been changed to have the given size (possibly from 0, | |
165 // for initialization.) | |
166 virtual void resize_covered_region(MemRegion new_region) = 0; | |
167 | |
168 // If the barrier set imposes any alignment restrictions on boundaries | |
169 // within the heap, this function tells whether they are met. | |
170 virtual bool is_aligned(HeapWord* addr) = 0; | |
171 | |
172 }; |