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annotate src/share/vm/memory/genRemSet.hpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
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 | d2a62e0f25eb |
| rev | line source |
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| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2001, 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_GENREMSET_HPP |
| 26 #define SHARE_VM_MEMORY_GENREMSET_HPP | |
| 27 | |
| 28 #include "oops/oop.hpp" | |
| 29 | |
| 0 | 30 // A GenRemSet provides ways of iterating over pointers accross generations. |
| 31 // (This is especially useful for older-to-younger.) | |
| 32 | |
| 33 class Generation; | |
| 34 class BarrierSet; | |
| 35 class OopsInGenClosure; | |
| 36 class CardTableRS; | |
| 37 | |
| 38 class GenRemSet: public CHeapObj { | |
| 39 friend class Generation; | |
| 40 | |
| 41 BarrierSet* _bs; | |
| 42 | |
| 43 public: | |
| 44 enum Name { | |
| 45 CardTable, | |
| 46 Other | |
| 47 }; | |
| 48 | |
| 49 GenRemSet(BarrierSet * bs) : _bs(bs) {} | |
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50 GenRemSet() : _bs(NULL) {} |
| 0 | 51 |
| 52 virtual Name rs_kind() = 0; | |
| 53 | |
| 54 // These are for dynamic downcasts. Unfortunately that it names the | |
| 55 // possible subtypes (but not that they are subtypes!) Return NULL if | |
| 56 // the cast is invalide. | |
| 57 virtual CardTableRS* as_CardTableRS() { return NULL; } | |
| 58 | |
| 59 // Return the barrier set associated with "this." | |
| 60 BarrierSet* bs() { return _bs; } | |
| 61 | |
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62 // Set the barrier set. |
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63 void set_bs(BarrierSet* bs) { _bs = bs; } |
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64 |
| 0 | 65 // Do any (sequential) processing necessary to prepare for (possibly |
| 66 // "parallel", if that arg is true) calls to younger_refs_iterate. | |
| 67 virtual void prepare_for_younger_refs_iterate(bool parallel) = 0; | |
| 68 | |
| 69 // Apply the "do_oop" method of "blk" to (exactly) all oop locations | |
| 70 // 1) that are in objects allocated in "g" at the time of the last call | |
| 71 // to "save_Marks", and | |
| 72 // 2) that point to objects in younger generations. | |
| 73 virtual void younger_refs_iterate(Generation* g, OopsInGenClosure* blk) = 0; | |
| 74 | |
| 75 virtual void younger_refs_in_space_iterate(Space* sp, | |
| 76 OopsInGenClosure* cl) = 0; | |
| 77 | |
| 78 // This method is used to notify the remembered set that "new_val" has | |
| 79 // been written into "field" by the garbage collector. | |
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80 void write_ref_field_gc(void* field, oop new_val); |
| 0 | 81 protected: |
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82 virtual void write_ref_field_gc_work(void* field, oop new_val) = 0; |
| 0 | 83 public: |
| 84 | |
| 85 // A version of the above suitable for use by parallel collectors. | |
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86 virtual void write_ref_field_gc_par(void* field, oop new_val) = 0; |
| 0 | 87 |
| 88 // Resize one of the regions covered by the remembered set. | |
| 89 virtual void resize_covered_region(MemRegion new_region) = 0; | |
| 90 | |
| 91 // If the rem set imposes any alignment restrictions on boundaries | |
| 92 // within the heap, this function tells whether they are met. | |
| 93 virtual bool is_aligned(HeapWord* addr) = 0; | |
| 94 | |
| 95 // If the RS (or BS) imposes an aligment constraint on maximum heap size. | |
| 96 // (This must be static, and dispatch on "nm", because it is called | |
| 97 // before an RS is created.) | |
| 98 static uintx max_alignment_constraint(Name nm); | |
| 99 | |
| 100 virtual void verify() = 0; | |
| 101 | |
| 102 // Verify that the remembered set has no entries for | |
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103 // the heap interval denoted by mr. If there are any |
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104 // alignment constraints on the remembered set, only the |
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105 // part of the region that is aligned is checked. |
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106 // |
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107 // alignment boundaries |
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108 // +--------+-------+--------+-------+ |
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109 // [ region mr ) |
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110 // [ part checked ) |
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111 virtual void verify_aligned_region_empty(MemRegion mr) = 0; |
| 0 | 112 |
| 113 // If appropriate, print some information about the remset on "tty". | |
| 114 virtual void print() {} | |
| 115 | |
| 116 // Informs the RS that the given memregion contains no references to | |
| 117 // younger generations. | |
| 118 virtual void clear(MemRegion mr) = 0; | |
| 119 | |
| 120 // Informs the RS that there are no references to generations | |
| 121 // younger than gen from generations gen and older. | |
| 122 // The parameter clear_perm indicates if the perm_gen's | |
| 123 // remembered set should also be processed/cleared. | |
| 124 virtual void clear_into_younger(Generation* gen, bool clear_perm) = 0; | |
| 125 | |
| 126 // Informs the RS that refs in the given "mr" may have changed | |
| 127 // arbitrarily, and therefore may contain old-to-young pointers. | |
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128 // If "whole heap" is true, then this invalidation is part of an |
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129 // invalidation of the whole heap, which an implementation might |
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130 // handle differently than that of a sub-part of the heap. |
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131 virtual void invalidate(MemRegion mr, bool whole_heap = false) = 0; |
| 0 | 132 |
| 133 // Informs the RS that refs in this generation | |
| 134 // may have changed arbitrarily, and therefore may contain | |
| 135 // old-to-young pointers in arbitrary locations. The parameter | |
| 136 // younger indicates if the same should be done for younger generations | |
| 137 // as well. The parameter perm indicates if the same should be done for | |
| 138 // perm gen as well. | |
| 139 virtual void invalidate_or_clear(Generation* gen, bool younger, bool perm) = 0; | |
| 140 }; | |
| 1972 | 141 |
| 142 #endif // SHARE_VM_MEMORY_GENREMSET_HPP |