Mercurial > hg > truffle
annotate src/share/vm/memory/cardTableRS.hpp @ 1721:413ad0331a0c
6977924: Changes for 6975078 produce build error with certain gcc versions
Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error.
Reviewed-by: jcoomes, ysr, phh
| author | johnc |
|---|---|
| date | Wed, 18 Aug 2010 10:59:06 -0700 |
| parents | c18cbe5936b8 |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2001, 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 | |
| 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 | |
| 25 class Space; | |
| 26 class OopsInGenClosure; | |
| 27 class DirtyCardToOopClosure; | |
| 28 | |
| 29 // This kind of "GenRemSet" uses a card table both as shared data structure | |
| 30 // for a mod ref barrier set and for the rem set information. | |
| 31 | |
| 32 class CardTableRS: public GenRemSet { | |
| 33 friend class VMStructs; | |
| 34 // Below are private classes used in impl. | |
| 35 friend class VerifyCTSpaceClosure; | |
| 36 friend class ClearNoncleanCardWrapper; | |
| 37 | |
| 38 static jbyte clean_card_val() { | |
| 39 return CardTableModRefBS::clean_card; | |
| 40 } | |
| 41 | |
| 42 static bool | |
| 43 card_is_dirty_wrt_gen_iter(jbyte cv) { | |
| 44 return CardTableModRefBS::card_is_dirty_wrt_gen_iter(cv); | |
| 45 } | |
| 46 | |
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47 CardTableModRefBSForCTRS* _ct_bs; |
| 0 | 48 |
| 49 virtual void younger_refs_in_space_iterate(Space* sp, OopsInGenClosure* cl); | |
| 50 | |
| 51 void verify_space(Space* s, HeapWord* gen_start); | |
| 52 | |
| 53 enum ExtendedCardValue { | |
| 54 youngergen_card = CardTableModRefBS::CT_MR_BS_last_reserved + 1, | |
| 55 // These are for parallel collection. | |
| 56 // There are three P (parallel) youngergen card values. In general, this | |
| 57 // needs to be more than the number of generations (including the perm | |
| 58 // gen) that might have younger_refs_do invoked on them separately. So | |
| 59 // if we add more gens, we have to add more values. | |
| 60 youngergenP1_card = CardTableModRefBS::CT_MR_BS_last_reserved + 2, | |
| 61 youngergenP2_card = CardTableModRefBS::CT_MR_BS_last_reserved + 3, | |
| 62 youngergenP3_card = CardTableModRefBS::CT_MR_BS_last_reserved + 4, | |
| 63 cur_youngergen_and_prev_nonclean_card = | |
| 64 CardTableModRefBS::CT_MR_BS_last_reserved + 5 | |
| 65 }; | |
| 66 | |
| 67 // An array that contains, for each generation, the card table value last | |
| 68 // used as the current value for a younger_refs_do iteration of that | |
| 69 // portion of the table. (The perm gen is index 0; other gens are at | |
| 70 // their level plus 1. They youngest gen is in the table, but will | |
| 71 // always have the value "clean_card".) | |
| 72 jbyte* _last_cur_val_in_gen; | |
| 73 | |
| 74 jbyte _cur_youngergen_card_val; | |
| 75 | |
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76 int _regions_to_iterate; |
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77 |
| 0 | 78 jbyte cur_youngergen_card_val() { |
| 79 return _cur_youngergen_card_val; | |
| 80 } | |
| 81 void set_cur_youngergen_card_val(jbyte v) { | |
| 82 _cur_youngergen_card_val = v; | |
| 83 } | |
| 84 bool is_prev_youngergen_card_val(jbyte v) { | |
| 85 return | |
| 86 youngergen_card <= v && | |
| 87 v < cur_youngergen_and_prev_nonclean_card && | |
| 88 v != _cur_youngergen_card_val; | |
| 89 } | |
| 90 // Return a youngergen_card_value that is not currently in use. | |
| 91 jbyte find_unused_youngergenP_card_value(); | |
| 92 | |
| 93 public: | |
| 94 CardTableRS(MemRegion whole_heap, int max_covered_regions); | |
| 95 | |
| 96 // *** GenRemSet functions. | |
| 97 GenRemSet::Name rs_kind() { return GenRemSet::CardTable; } | |
| 98 | |
| 99 CardTableRS* as_CardTableRS() { return this; } | |
| 100 | |
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101 CardTableModRefBS* ct_bs() { return _ct_bs; } |
| 0 | 102 |
| 103 // Override. | |
| 104 void prepare_for_younger_refs_iterate(bool parallel); | |
| 105 | |
| 106 // Card table entries are cleared before application; "blk" is | |
| 107 // responsible for dirtying if the oop is still older-to-younger after | |
| 108 // closure application. | |
| 109 void younger_refs_iterate(Generation* g, OopsInGenClosure* blk); | |
| 110 | |
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111 void inline_write_ref_field_gc(void* field, oop new_val) { |
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112 jbyte* byte = _ct_bs->byte_for(field); |
| 0 | 113 *byte = youngergen_card; |
| 114 } | |
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115 void write_ref_field_gc_work(void* field, oop new_val) { |
| 0 | 116 inline_write_ref_field_gc(field, new_val); |
| 117 } | |
| 118 | |
| 119 // Override. Might want to devirtualize this in the same fashion as | |
| 120 // above. Ensures that the value of the card for field says that it's | |
| 121 // a younger card in the current collection. | |
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122 virtual void write_ref_field_gc_par(void* field, oop new_val); |
| 0 | 123 |
| 124 void resize_covered_region(MemRegion new_region); | |
| 125 | |
| 126 bool is_aligned(HeapWord* addr) { | |
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127 return _ct_bs->is_card_aligned(addr); |
| 0 | 128 } |
| 129 | |
| 130 void verify(); | |
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131 void verify_aligned_region_empty(MemRegion mr); |
| 0 | 132 |
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133 void clear(MemRegion mr) { _ct_bs->clear(mr); } |
| 0 | 134 void clear_into_younger(Generation* gen, bool clear_perm); |
| 135 | |
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136 void invalidate(MemRegion mr, bool whole_heap = false) { |
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137 _ct_bs->invalidate(mr, whole_heap); |
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138 } |
| 0 | 139 void invalidate_or_clear(Generation* gen, bool younger, bool perm); |
| 140 | |
| 141 static uintx ct_max_alignment_constraint() { | |
| 142 return CardTableModRefBS::ct_max_alignment_constraint(); | |
| 143 } | |
| 144 | |
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145 jbyte* byte_for(void* p) { return _ct_bs->byte_for(p); } |
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146 jbyte* byte_after(void* p) { return _ct_bs->byte_after(p); } |
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147 HeapWord* addr_for(jbyte* p) { return _ct_bs->addr_for(p); } |
| 0 | 148 |
| 149 bool is_prev_nonclean_card_val(jbyte v) { | |
| 150 return | |
| 151 youngergen_card <= v && | |
| 152 v <= cur_youngergen_and_prev_nonclean_card && | |
| 153 v != _cur_youngergen_card_val; | |
| 154 } | |
| 155 | |
| 156 static bool youngergen_may_have_been_dirty(jbyte cv) { | |
| 157 return cv == CardTableRS::cur_youngergen_and_prev_nonclean_card; | |
| 158 } | |
| 159 | |
| 160 }; |