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annotate src/share/vm/memory/barrierSet.hpp @ 1972:f95d63e2154a
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Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | c18cbe5936b8 |
| children | 0ac769a57c64 |
| rev | line source |
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| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2000, 2010, 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 | |
| 34 class BarrierSet: public CHeapObj { | |
| 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 | |
| 47 protected: | |
| 48 int _max_covered_regions; | |
| 49 Name _kind; | |
| 50 | |
| 51 public: | |
| 52 | |
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53 BarrierSet() { _kind = Uninit; } |
| 0 | 54 // To get around prohibition on RTTI. |
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55 BarrierSet::Name kind() { return _kind; } |
| 0 | 56 virtual bool is_a(BarrierSet::Name bsn) = 0; |
| 57 | |
| 58 // These operations indicate what kind of barriers the BarrierSet has. | |
| 59 virtual bool has_read_ref_barrier() = 0; | |
| 60 virtual bool has_read_prim_barrier() = 0; | |
| 61 virtual bool has_write_ref_barrier() = 0; | |
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62 virtual bool has_write_ref_pre_barrier() = 0; |
| 0 | 63 virtual bool has_write_prim_barrier() = 0; |
| 64 | |
| 65 // These functions indicate whether a particular access of the given | |
| 66 // kinds requires a barrier. | |
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67 virtual bool read_ref_needs_barrier(void* field) = 0; |
| 0 | 68 virtual bool read_prim_needs_barrier(HeapWord* field, size_t bytes) = 0; |
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69 virtual bool write_ref_needs_barrier(void* field, oop new_val) = 0; |
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70 virtual bool write_prim_needs_barrier(HeapWord* field, size_t bytes, |
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71 juint val1, juint val2) = 0; |
| 0 | 72 |
| 73 // The first four operations provide a direct implementation of the | |
| 74 // barrier set. An interpreter loop, for example, could call these | |
| 75 // directly, as appropriate. | |
| 76 | |
| 77 // Invoke the barrier, if any, necessary when reading the given ref field. | |
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78 virtual void read_ref_field(void* field) = 0; |
| 0 | 79 |
| 80 // Invoke the barrier, if any, necessary when reading the given primitive | |
| 81 // "field" of "bytes" bytes in "obj". | |
| 82 virtual void read_prim_field(HeapWord* field, size_t bytes) = 0; | |
| 83 | |
| 84 // Invoke the barrier, if any, necessary when writing "new_val" into the | |
| 85 // ref field at "offset" in "obj". | |
| 86 // (For efficiency reasons, this operation is specialized for certain | |
| 87 // barrier types. Semantically, it should be thought of as a call to the | |
| 88 // virtual "_work" function below, which must implement the barrier.) | |
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89 // First the pre-write versions... |
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90 template <class T> inline void write_ref_field_pre(T* field, oop new_val); |
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91 private: |
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92 // Keep this private so as to catch violations at build time. |
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93 virtual void write_ref_field_pre_work( void* field, oop new_val) { guarantee(false, "Not needed"); }; |
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94 protected: |
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95 virtual void write_ref_field_pre_work( oop* field, oop new_val) {}; |
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96 virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) {}; |
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97 public: |
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98 |
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99 // ...then the post-write version. |
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100 inline void write_ref_field(void* field, oop new_val); |
| 0 | 101 protected: |
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102 virtual void write_ref_field_work(void* field, oop new_val) = 0; |
| 0 | 103 public: |
| 104 | |
| 105 // Invoke the barrier, if any, necessary when writing the "bytes"-byte | |
| 106 // value(s) "val1" (and "val2") into the primitive "field". | |
| 107 virtual void write_prim_field(HeapWord* field, size_t bytes, | |
| 108 juint val1, juint val2) = 0; | |
| 109 | |
| 110 // Operations on arrays, or general regions (e.g., for "clone") may be | |
| 111 // optimized by some barriers. | |
| 112 | |
| 113 // The first six operations tell whether such an optimization exists for | |
| 114 // the particular barrier. | |
| 115 virtual bool has_read_ref_array_opt() = 0; | |
| 116 virtual bool has_read_prim_array_opt() = 0; | |
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117 virtual bool has_write_ref_array_pre_opt() { return true; } |
| 0 | 118 virtual bool has_write_ref_array_opt() = 0; |
| 119 virtual bool has_write_prim_array_opt() = 0; | |
| 120 | |
| 121 virtual bool has_read_region_opt() = 0; | |
| 122 virtual bool has_write_region_opt() = 0; | |
| 123 | |
| 124 // These operations should assert false unless the correponding operation | |
| 125 // above returns true. Otherwise, they should perform an appropriate | |
| 126 // barrier for an array whose elements are all in the given memory region. | |
| 127 virtual void read_ref_array(MemRegion mr) = 0; | |
| 128 virtual void read_prim_array(MemRegion mr) = 0; | |
| 129 | |
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130 // Below length is the # array elements being written |
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131 virtual void write_ref_array_pre( oop* dst, int length) {} |
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132 virtual void write_ref_array_pre(narrowOop* dst, int length) {} |
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133 // Below count is the # array elements being written, starting |
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134 // at the address "start", which may not necessarily be HeapWord-aligned |
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135 inline void write_ref_array(HeapWord* start, size_t count); |
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136 |
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137 // Static versions, suitable for calling from generated code; |
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138 // count is # array elements being written, starting with "start", |
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139 // which may not necessarily be HeapWord-aligned. |
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140 static void static_write_ref_array_pre(HeapWord* start, size_t count); |
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141 static void static_write_ref_array_post(HeapWord* start, size_t count); |
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142 |
| 0 | 143 protected: |
| 144 virtual void write_ref_array_work(MemRegion mr) = 0; | |
| 145 public: | |
| 146 virtual void write_prim_array(MemRegion mr) = 0; | |
| 147 | |
| 148 virtual void read_region(MemRegion mr) = 0; | |
| 149 | |
| 150 // (For efficiency reasons, this operation is specialized for certain | |
| 151 // barrier types. Semantically, it should be thought of as a call to the | |
| 152 // virtual "_work" function below, which must implement the barrier.) | |
| 153 inline void write_region(MemRegion mr); | |
| 154 protected: | |
| 155 virtual void write_region_work(MemRegion mr) = 0; | |
| 156 public: | |
| 157 | |
| 158 // Some barrier sets create tables whose elements correspond to parts of | |
| 159 // the heap; the CardTableModRefBS is an example. Such barrier sets will | |
| 160 // normally reserve space for such tables, and commit parts of the table | |
| 161 // "covering" parts of the heap that are committed. The constructor is | |
| 162 // passed the maximum number of independently committable subregions to | |
| 163 // be covered, and the "resize_covoered_region" function allows the | |
| 164 // sub-parts of the heap to inform the barrier set of changes of their | |
| 165 // sizes. | |
| 166 BarrierSet(int max_covered_regions) : | |
| 167 _max_covered_regions(max_covered_regions) {} | |
| 168 | |
| 169 // Inform the BarrierSet that the the covered heap region that starts | |
| 170 // with "base" has been changed to have the given size (possibly from 0, | |
| 171 // for initialization.) | |
| 172 virtual void resize_covered_region(MemRegion new_region) = 0; | |
| 173 | |
| 174 // If the barrier set imposes any alignment restrictions on boundaries | |
| 175 // within the heap, this function tells whether they are met. | |
| 176 virtual bool is_aligned(HeapWord* addr) = 0; | |
| 177 | |
| 178 }; | |
| 1972 | 179 |
| 180 #endif // SHARE_VM_MEMORY_BARRIERSET_HPP |