Mercurial > hg > truffle
annotate src/share/vm/memory/genRemSet.hpp @ 356:1ee8caae33af
Merge
| author | tonyp |
|---|---|
| date | Thu, 21 Aug 2008 23:36:31 -0400 |
| parents | 37f87013dfd8 d1605aabd0a1 |
| children | c18cbe5936b8 |
| rev | line source |
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| 0 | 1 /* |
| 196 | 2 * Copyright 2001-2008 Sun Microsystems, Inc. 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // A GenRemSet provides ways of iterating over pointers accross generations. | |
| 26 // (This is especially useful for older-to-younger.) | |
| 27 | |
| 28 class Generation; | |
| 29 class BarrierSet; | |
| 30 class OopsInGenClosure; | |
| 31 class CardTableRS; | |
| 32 | |
| 33 class GenRemSet: public CHeapObj { | |
| 34 friend class Generation; | |
| 35 | |
| 36 BarrierSet* _bs; | |
| 37 | |
| 38 public: | |
| 39 enum Name { | |
| 40 CardTable, | |
| 41 Other | |
| 42 }; | |
| 43 | |
| 44 GenRemSet(BarrierSet * bs) : _bs(bs) {} | |
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45 GenRemSet() : _bs(NULL) {} |
| 0 | 46 |
| 47 virtual Name rs_kind() = 0; | |
| 48 | |
| 49 // These are for dynamic downcasts. Unfortunately that it names the | |
| 50 // possible subtypes (but not that they are subtypes!) Return NULL if | |
| 51 // the cast is invalide. | |
| 52 virtual CardTableRS* as_CardTableRS() { return NULL; } | |
| 53 | |
| 54 // Return the barrier set associated with "this." | |
| 55 BarrierSet* bs() { return _bs; } | |
| 56 | |
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57 // Set the barrier set. |
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58 void set_bs(BarrierSet* bs) { _bs = bs; } |
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59 |
| 0 | 60 // Do any (sequential) processing necessary to prepare for (possibly |
| 61 // "parallel", if that arg is true) calls to younger_refs_iterate. | |
| 62 virtual void prepare_for_younger_refs_iterate(bool parallel) = 0; | |
| 63 | |
| 64 // Apply the "do_oop" method of "blk" to (exactly) all oop locations | |
| 65 // 1) that are in objects allocated in "g" at the time of the last call | |
| 66 // to "save_Marks", and | |
| 67 // 2) that point to objects in younger generations. | |
| 68 virtual void younger_refs_iterate(Generation* g, OopsInGenClosure* blk) = 0; | |
| 69 | |
| 70 virtual void younger_refs_in_space_iterate(Space* sp, | |
| 71 OopsInGenClosure* cl) = 0; | |
| 72 | |
| 73 // This method is used to notify the remembered set that "new_val" has | |
| 74 // been written into "field" by the garbage collector. | |
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75 void write_ref_field_gc(void* field, oop new_val); |
| 0 | 76 protected: |
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77 virtual void write_ref_field_gc_work(void* field, oop new_val) = 0; |
| 0 | 78 public: |
| 79 | |
| 80 // A version of the above suitable for use by parallel collectors. | |
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81 virtual void write_ref_field_gc_par(void* field, oop new_val) = 0; |
| 0 | 82 |
| 83 // Resize one of the regions covered by the remembered set. | |
| 84 virtual void resize_covered_region(MemRegion new_region) = 0; | |
| 85 | |
| 86 // If the rem set imposes any alignment restrictions on boundaries | |
| 87 // within the heap, this function tells whether they are met. | |
| 88 virtual bool is_aligned(HeapWord* addr) = 0; | |
| 89 | |
| 90 // If the RS (or BS) imposes an aligment constraint on maximum heap size. | |
| 91 // (This must be static, and dispatch on "nm", because it is called | |
| 92 // before an RS is created.) | |
| 93 static uintx max_alignment_constraint(Name nm); | |
| 94 | |
| 95 virtual void verify() = 0; | |
| 96 | |
| 97 // Verify that the remembered set has no entries for | |
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98 // the heap interval denoted by mr. If there are any |
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99 // alignment constraints on the remembered set, only the |
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100 // part of the region that is aligned is checked. |
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101 // |
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102 // alignment boundaries |
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103 // +--------+-------+--------+-------+ |
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104 // [ region mr ) |
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105 // [ part checked ) |
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106 virtual void verify_aligned_region_empty(MemRegion mr) = 0; |
| 0 | 107 |
| 108 // If appropriate, print some information about the remset on "tty". | |
| 109 virtual void print() {} | |
| 110 | |
| 111 // Informs the RS that the given memregion contains no references to | |
| 112 // younger generations. | |
| 113 virtual void clear(MemRegion mr) = 0; | |
| 114 | |
| 115 // Informs the RS that there are no references to generations | |
| 116 // younger than gen from generations gen and older. | |
| 117 // The parameter clear_perm indicates if the perm_gen's | |
| 118 // remembered set should also be processed/cleared. | |
| 119 virtual void clear_into_younger(Generation* gen, bool clear_perm) = 0; | |
| 120 | |
| 121 // Informs the RS that refs in the given "mr" may have changed | |
| 122 // arbitrarily, and therefore may contain old-to-young pointers. | |
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123 // If "whole heap" is true, then this invalidation is part of an |
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124 // invalidation of the whole heap, which an implementation might |
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125 // handle differently than that of a sub-part of the heap. |
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126 virtual void invalidate(MemRegion mr, bool whole_heap = false) = 0; |
| 0 | 127 |
| 128 // Informs the RS that refs in this generation | |
| 129 // may have changed arbitrarily, and therefore may contain | |
| 130 // old-to-young pointers in arbitrary locations. The parameter | |
| 131 // younger indicates if the same should be done for younger generations | |
| 132 // as well. The parameter perm indicates if the same should be done for | |
| 133 // perm gen as well. | |
| 134 virtual void invalidate_or_clear(Generation* gen, bool younger, bool perm) = 0; | |
| 135 }; |