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annotate src/share/vm/memory/barrierSet.hpp @ 14702:d4dd5204c0aa
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0 | 1 /* |
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2 * Copyright (c) 2000, 2012, 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 | |
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 * | |
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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_BARRIERSET_HPP |
26 #define SHARE_VM_MEMORY_BARRIERSET_HPP | |
27 | |
28 #include "memory/memRegion.hpp" | |
29 #include "oops/oopsHierarchy.hpp" | |
30 | |
0 | 31 // This class provides the interface between a barrier implementation and |
32 // the rest of the system. | |
33 | |
6197 | 34 class BarrierSet: public CHeapObj<mtGC> { |
0 | 35 friend class VMStructs; |
36 public: | |
37 enum Name { | |
38 ModRef, | |
39 CardTableModRef, | |
40 CardTableExtension, | |
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41 G1SATBCT, |
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42 G1SATBCTLogging, |
0 | 43 Other, |
44 Uninit | |
45 }; | |
46 | |
2324 | 47 enum Flags { |
48 None = 0, | |
49 TargetUninitialized = 1 | |
50 }; | |
0 | 51 protected: |
52 int _max_covered_regions; | |
53 Name _kind; | |
54 | |
55 public: | |
56 | |
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57 BarrierSet() { _kind = Uninit; } |
0 | 58 // To get around prohibition on RTTI. |
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59 BarrierSet::Name kind() { return _kind; } |
0 | 60 virtual bool is_a(BarrierSet::Name bsn) = 0; |
61 | |
62 // These operations indicate what kind of barriers the BarrierSet has. | |
63 virtual bool has_read_ref_barrier() = 0; | |
64 virtual bool has_read_prim_barrier() = 0; | |
65 virtual bool has_write_ref_barrier() = 0; | |
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66 virtual bool has_write_ref_pre_barrier() = 0; |
0 | 67 virtual bool has_write_prim_barrier() = 0; |
68 | |
69 // These functions indicate whether a particular access of the given | |
70 // kinds requires a barrier. | |
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71 virtual bool read_ref_needs_barrier(void* field) = 0; |
0 | 72 virtual bool read_prim_needs_barrier(HeapWord* field, size_t bytes) = 0; |
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73 virtual bool write_prim_needs_barrier(HeapWord* field, size_t bytes, |
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74 juint val1, juint val2) = 0; |
0 | 75 |
76 // The first four operations provide a direct implementation of the | |
77 // barrier set. An interpreter loop, for example, could call these | |
78 // directly, as appropriate. | |
79 | |
80 // Invoke the barrier, if any, necessary when reading the given ref field. | |
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81 virtual void read_ref_field(void* field) = 0; |
0 | 82 |
83 // Invoke the barrier, if any, necessary when reading the given primitive | |
84 // "field" of "bytes" bytes in "obj". | |
85 virtual void read_prim_field(HeapWord* field, size_t bytes) = 0; | |
86 | |
87 // Invoke the barrier, if any, necessary when writing "new_val" into the | |
88 // ref field at "offset" in "obj". | |
89 // (For efficiency reasons, this operation is specialized for certain | |
90 // barrier types. Semantically, it should be thought of as a call to the | |
91 // virtual "_work" function below, which must implement the barrier.) | |
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92 // First the pre-write versions... |
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93 template <class T> inline void write_ref_field_pre(T* field, oop new_val); |
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94 private: |
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95 // Keep this private so as to catch violations at build time. |
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96 virtual void write_ref_field_pre_work( void* field, oop new_val) { guarantee(false, "Not needed"); }; |
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97 protected: |
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98 virtual void write_ref_field_pre_work( oop* field, oop new_val) {}; |
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99 virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) {}; |
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100 public: |
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101 |
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102 // ...then the post-write version. |
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103 inline void write_ref_field(void* field, oop new_val, bool release = false); |
0 | 104 protected: |
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105 virtual void write_ref_field_work(void* field, oop new_val, bool release = false) = 0; |
0 | 106 public: |
107 | |
108 // Invoke the barrier, if any, necessary when writing the "bytes"-byte | |
109 // value(s) "val1" (and "val2") into the primitive "field". | |
110 virtual void write_prim_field(HeapWord* field, size_t bytes, | |
111 juint val1, juint val2) = 0; | |
112 | |
113 // Operations on arrays, or general regions (e.g., for "clone") may be | |
114 // optimized by some barriers. | |
115 | |
116 // The first six operations tell whether such an optimization exists for | |
117 // the particular barrier. | |
118 virtual bool has_read_ref_array_opt() = 0; | |
119 virtual bool has_read_prim_array_opt() = 0; | |
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120 virtual bool has_write_ref_array_pre_opt() { return true; } |
0 | 121 virtual bool has_write_ref_array_opt() = 0; |
122 virtual bool has_write_prim_array_opt() = 0; | |
123 | |
124 virtual bool has_read_region_opt() = 0; | |
125 virtual bool has_write_region_opt() = 0; | |
126 | |
14309 | 127 // These operations should assert false unless the corresponding operation |
0 | 128 // above returns true. Otherwise, they should perform an appropriate |
129 // barrier for an array whose elements are all in the given memory region. | |
130 virtual void read_ref_array(MemRegion mr) = 0; | |
131 virtual void read_prim_array(MemRegion mr) = 0; | |
132 | |
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133 // Below length is the # array elements being written |
2324 | 134 virtual void write_ref_array_pre(oop* dst, int length, |
135 bool dest_uninitialized = false) {} | |
136 virtual void write_ref_array_pre(narrowOop* dst, int length, | |
137 bool dest_uninitialized = false) {} | |
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138 // Below count is the # array elements being written, starting |
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139 // at the address "start", which may not necessarily be HeapWord-aligned |
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140 inline void write_ref_array(HeapWord* start, size_t count); |
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141 |
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142 // Static versions, suitable for calling from generated code; |
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143 // count is # array elements being written, starting with "start", |
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144 // which may not necessarily be HeapWord-aligned. |
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145 static void static_write_ref_array_pre(HeapWord* start, size_t count); |
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146 static void static_write_ref_array_post(HeapWord* start, size_t count); |
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147 |
0 | 148 protected: |
149 virtual void write_ref_array_work(MemRegion mr) = 0; | |
150 public: | |
151 virtual void write_prim_array(MemRegion mr) = 0; | |
152 | |
153 virtual void read_region(MemRegion mr) = 0; | |
154 | |
155 // (For efficiency reasons, this operation is specialized for certain | |
156 // barrier types. Semantically, it should be thought of as a call to the | |
157 // virtual "_work" function below, which must implement the barrier.) | |
158 inline void write_region(MemRegion mr); | |
159 protected: | |
160 virtual void write_region_work(MemRegion mr) = 0; | |
161 public: | |
162 | |
163 // Some barrier sets create tables whose elements correspond to parts of | |
164 // the heap; the CardTableModRefBS is an example. Such barrier sets will | |
165 // normally reserve space for such tables, and commit parts of the table | |
166 // "covering" parts of the heap that are committed. The constructor is | |
167 // passed the maximum number of independently committable subregions to | |
14309 | 168 // be covered, and the "resize_covered_region" function allows the |
0 | 169 // sub-parts of the heap to inform the barrier set of changes of their |
170 // sizes. | |
171 BarrierSet(int max_covered_regions) : | |
172 _max_covered_regions(max_covered_regions) {} | |
173 | |
174 // Inform the BarrierSet that the the covered heap region that starts | |
175 // with "base" has been changed to have the given size (possibly from 0, | |
176 // for initialization.) | |
177 virtual void resize_covered_region(MemRegion new_region) = 0; | |
178 | |
179 // If the barrier set imposes any alignment restrictions on boundaries | |
180 // within the heap, this function tells whether they are met. | |
181 virtual bool is_aligned(HeapWord* addr) = 0; | |
182 | |
5984 | 183 // Print a description of the memory for the barrier set |
184 virtual void print_on(outputStream* st) const = 0; | |
0 | 185 }; |
1972 | 186 |
187 #endif // SHARE_VM_MEMORY_BARRIERSET_HPP |