Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp @ 10185:d50cc62e94ff
8012715: G1: GraphKit accesses PtrQueue::_index as int but is size_t
Summary: In graphKit INT operations were generated to access PtrQueue::_index which has type size_t. This is 64 bit on 64-bit machines. No problems occur on little endian machines as long as the index fits into 32 bit, but on big endian machines the upper part is read, which is zero. This leads to unnecessary branches to the slow path in the runtime.
Reviewed-by: twisti, johnc
Contributed-by: Martin Doerr <martin.doerr@sap.com>
| author | johnc |
|---|---|
| date | Wed, 24 Apr 2013 14:48:43 -0700 |
| parents | f81a7c0c618d |
| children |
| rev | line source |
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| 0 | 1 /* |
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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_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP | |
| 27 | |
| 28 #include "memory/cardTableModRefBS.hpp" | |
| 29 | |
| 0 | 30 class MutableSpace; |
| 31 class ObjectStartArray; | |
| 32 class PSPromotionManager; | |
| 33 class GCTaskQueue; | |
| 34 | |
| 35 class CardTableExtension : public CardTableModRefBS { | |
| 36 private: | |
| 37 // Support methods for resizing the card table. | |
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38 // resize_commit_uncommit() returns true if the pages were committed or |
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39 // uncommitted |
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40 bool resize_commit_uncommit(int changed_region, MemRegion new_region); |
| 0 | 41 void resize_update_card_table_entries(int changed_region, |
| 42 MemRegion new_region); | |
| 43 void resize_update_committed_table(int changed_region, MemRegion new_region); | |
| 44 void resize_update_covered_table(int changed_region, MemRegion new_region); | |
| 45 | |
| 46 protected: | |
| 47 | |
| 48 static void verify_all_young_refs_precise_helper(MemRegion mr); | |
| 49 | |
| 50 public: | |
| 51 enum ExtendedCardValue { | |
| 52 youngergen_card = CardTableModRefBS::CT_MR_BS_last_reserved + 1, | |
| 53 verify_card = CardTableModRefBS::CT_MR_BS_last_reserved + 5 | |
| 54 }; | |
| 55 | |
| 56 CardTableExtension(MemRegion whole_heap, int max_covered_regions) : | |
| 57 CardTableModRefBS(whole_heap, max_covered_regions) { } | |
| 58 | |
| 59 // Too risky for the 4/10/02 putback | |
| 60 // BarrierSet::Name kind() { return BarrierSet::CardTableExtension; } | |
| 61 | |
| 62 // Scavenge support | |
| 63 void scavenge_contents_parallel(ObjectStartArray* start_array, | |
| 64 MutableSpace* sp, | |
| 65 HeapWord* space_top, | |
| 66 PSPromotionManager* pm, | |
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67 uint stripe_number, |
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68 uint stripe_total); |
| 0 | 69 |
| 70 // Verification | |
| 71 static void verify_all_young_refs_imprecise(); | |
| 72 static void verify_all_young_refs_precise(); | |
| 73 | |
| 74 bool addr_is_marked_imprecise(void *addr); | |
| 75 bool addr_is_marked_precise(void *addr); | |
| 76 | |
| 77 void set_card_newgen(void* addr) { jbyte* p = byte_for(addr); *p = verify_card; } | |
| 78 | |
| 79 // Testers for entries | |
| 80 static bool card_is_dirty(int value) { return value == dirty_card; } | |
| 81 static bool card_is_newgen(int value) { return value == youngergen_card; } | |
| 82 static bool card_is_clean(int value) { return value == clean_card; } | |
| 83 static bool card_is_verify(int value) { return value == verify_card; } | |
| 84 | |
| 85 // Card marking | |
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86 void inline_write_ref_field_gc(void* field, oop new_val) { |
| 0 | 87 jbyte* byte = byte_for(field); |
| 88 *byte = youngergen_card; | |
| 89 } | |
| 90 | |
| 91 // Adaptive size policy support | |
| 92 // Allows adjustment of the base and size of the covered regions | |
| 93 void resize_covered_region(MemRegion new_region); | |
| 94 // Finds the covered region to resize based on the start address | |
| 95 // of the covered regions. | |
| 96 void resize_covered_region_by_start(MemRegion new_region); | |
| 97 // Finds the covered region to resize based on the end address | |
| 98 // of the covered regions. | |
| 99 void resize_covered_region_by_end(int changed_region, MemRegion new_region); | |
| 100 // Finds the lowest start address of a covered region that is | |
| 101 // previous (i.e., lower index) to the covered region with index "ind". | |
| 102 HeapWord* lowest_prev_committed_start(int ind) const; | |
| 103 | |
| 104 #ifdef ASSERT | |
| 105 | |
| 106 bool is_valid_card_address(jbyte* addr) { | |
| 107 return (addr >= _byte_map) && (addr < _byte_map + _byte_map_size); | |
| 108 } | |
| 109 | |
| 110 #endif // ASSERT | |
| 111 }; | |
| 1972 | 112 |
| 113 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_CARDTABLEEXTENSION_HPP |