Thu, 07 Aug 2014 22:28:53 +0200
8054341: Remove some obsolete code in G1CollectedHeap class
Summary: Remove dead code.
Reviewed-by: stefank, brutisso
ysr@777 | 1 | /* |
mikael@6198 | 2 | * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. |
ysr@777 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
ysr@777 | 4 | * |
ysr@777 | 5 | * This code is free software; you can redistribute it and/or modify it |
ysr@777 | 6 | * under the terms of the GNU General Public License version 2 only, as |
ysr@777 | 7 | * published by the Free Software Foundation. |
ysr@777 | 8 | * |
ysr@777 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
ysr@777 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
ysr@777 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
ysr@777 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
ysr@777 | 13 | * accompanied this code). |
ysr@777 | 14 | * |
ysr@777 | 15 | * You should have received a copy of the GNU General Public License version |
ysr@777 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
ysr@777 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
ysr@777 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
ysr@777 | 22 | * |
ysr@777 | 23 | */ |
ysr@777 | 24 | |
stefank@2314 | 25 | #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP |
stefank@2314 | 26 | #define SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP |
stefank@2314 | 27 | |
stefank@2314 | 28 | #include "memory/cardTableModRefBS.hpp" |
stefank@2314 | 29 | #include "memory/memRegion.hpp" |
stefank@2314 | 30 | #include "oops/oop.inline.hpp" |
jprovino@4542 | 31 | #include "utilities/macros.hpp" |
stefank@2314 | 32 | |
jprovino@4542 | 33 | #if INCLUDE_ALL_GCS |
ysr@777 | 34 | |
ysr@777 | 35 | class DirtyCardQueueSet; |
ysr@777 | 36 | |
ysr@777 | 37 | // This barrier is specialized to use a logging barrier to support |
ysr@777 | 38 | // snapshot-at-the-beginning marking. |
ysr@777 | 39 | |
ysr@777 | 40 | class G1SATBCardTableModRefBS: public CardTableModRefBSForCTRS { |
mgerdin@5860 | 41 | protected: |
mgerdin@5860 | 42 | enum G1CardValues { |
mgerdin@5860 | 43 | g1_young_gen = CT_MR_BS_last_reserved << 1 |
mgerdin@5860 | 44 | }; |
mgerdin@5860 | 45 | |
johnc@2781 | 46 | public: |
mgerdin@5860 | 47 | static int g1_young_card_val() { return g1_young_gen; } |
mgerdin@5860 | 48 | |
ysr@777 | 49 | // Add "pre_val" to a set of objects that may have been disconnected from the |
ysr@777 | 50 | // pre-marking object graph. |
ysr@777 | 51 | static void enqueue(oop pre_val); |
ysr@777 | 52 | |
ysr@777 | 53 | G1SATBCardTableModRefBS(MemRegion whole_heap, |
ysr@777 | 54 | int max_covered_regions); |
ysr@777 | 55 | |
ysr@777 | 56 | bool is_a(BarrierSet::Name bsn) { |
ysr@777 | 57 | return bsn == BarrierSet::G1SATBCT || CardTableModRefBS::is_a(bsn); |
ysr@777 | 58 | } |
ysr@777 | 59 | |
ysr@777 | 60 | virtual bool has_write_ref_pre_barrier() { return true; } |
ysr@777 | 61 | |
ysr@777 | 62 | // This notes that we don't need to access any BarrierSet data |
ysr@777 | 63 | // structures, so this can be called from a static context. |
ysr@1280 | 64 | template <class T> static void write_ref_field_pre_static(T* field, oop newVal) { |
ysr@1280 | 65 | T heap_oop = oopDesc::load_heap_oop(field); |
ysr@1280 | 66 | if (!oopDesc::is_null(heap_oop)) { |
ysr@1280 | 67 | enqueue(oopDesc::decode_heap_oop(heap_oop)); |
ysr@777 | 68 | } |
ysr@777 | 69 | } |
ysr@777 | 70 | |
ysr@777 | 71 | // We export this to make it available in cases where the static |
ysr@777 | 72 | // type of the barrier set is known. Note that it is non-virtual. |
ysr@1280 | 73 | template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal) { |
ysr@777 | 74 | write_ref_field_pre_static(field, newVal); |
ysr@777 | 75 | } |
ysr@777 | 76 | |
ysr@1280 | 77 | // These are the more general virtual versions. |
ysr@1280 | 78 | virtual void write_ref_field_pre_work(oop* field, oop new_val) { |
ysr@777 | 79 | inline_write_ref_field_pre(field, new_val); |
ysr@777 | 80 | } |
ysr@1280 | 81 | virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) { |
ysr@1280 | 82 | inline_write_ref_field_pre(field, new_val); |
ysr@1280 | 83 | } |
ysr@1280 | 84 | virtual void write_ref_field_pre_work(void* field, oop new_val) { |
ysr@1280 | 85 | guarantee(false, "Not needed"); |
ysr@1280 | 86 | } |
ysr@777 | 87 | |
ysr@1280 | 88 | template <class T> void write_ref_array_pre_work(T* dst, int count); |
mgerdin@6989 | 89 | virtual void write_ref_array_pre(oop* dst, int count, bool dest_uninitialized); |
mgerdin@6989 | 90 | virtual void write_ref_array_pre(narrowOop* dst, int count, bool dest_uninitialized); |
mgerdin@5811 | 91 | |
mgerdin@5811 | 92 | /* |
mgerdin@5811 | 93 | Claimed and deferred bits are used together in G1 during the evacuation |
mgerdin@5811 | 94 | pause. These bits can have the following state transitions: |
mgerdin@5811 | 95 | 1. The claimed bit can be put over any other card state. Except that |
mgerdin@5811 | 96 | the "dirty -> dirty and claimed" transition is checked for in |
mgerdin@5811 | 97 | G1 code and is not used. |
mgerdin@5811 | 98 | 2. Deferred bit can be set only if the previous state of the card |
mgerdin@5811 | 99 | was either clean or claimed. mark_card_deferred() is wait-free. |
mgerdin@5811 | 100 | We do not care if the operation is be successful because if |
mgerdin@5811 | 101 | it does not it will only result in duplicate entry in the update |
mgerdin@5811 | 102 | buffer because of the "cache-miss". So it's not worth spinning. |
mgerdin@5811 | 103 | */ |
mgerdin@5811 | 104 | |
mgerdin@5811 | 105 | bool is_card_claimed(size_t card_index) { |
mgerdin@5811 | 106 | jbyte val = _byte_map[card_index]; |
mgerdin@5811 | 107 | return (val & (clean_card_mask_val() | claimed_card_val())) == claimed_card_val(); |
mgerdin@5811 | 108 | } |
mgerdin@5811 | 109 | |
mgerdin@5811 | 110 | void set_card_claimed(size_t card_index) { |
mgerdin@5811 | 111 | jbyte val = _byte_map[card_index]; |
mgerdin@5811 | 112 | if (val == clean_card_val()) { |
mgerdin@5811 | 113 | val = (jbyte)claimed_card_val(); |
mgerdin@5811 | 114 | } else { |
mgerdin@5811 | 115 | val |= (jbyte)claimed_card_val(); |
mgerdin@5811 | 116 | } |
mgerdin@5811 | 117 | _byte_map[card_index] = val; |
mgerdin@5811 | 118 | } |
mgerdin@5811 | 119 | |
mgerdin@5860 | 120 | void verify_g1_young_region(MemRegion mr) PRODUCT_RETURN; |
mgerdin@5860 | 121 | void g1_mark_as_young(const MemRegion& mr); |
mgerdin@5860 | 122 | |
mgerdin@5811 | 123 | bool mark_card_deferred(size_t card_index); |
mgerdin@5811 | 124 | |
mgerdin@5811 | 125 | bool is_card_deferred(size_t card_index) { |
mgerdin@5811 | 126 | jbyte val = _byte_map[card_index]; |
mgerdin@5811 | 127 | return (val & (clean_card_mask_val() | deferred_card_val())) == deferred_card_val(); |
mgerdin@5811 | 128 | } |
mgerdin@5811 | 129 | |
ysr@777 | 130 | }; |
ysr@777 | 131 | |
ysr@777 | 132 | // Adds card-table logging to the post-barrier. |
ysr@777 | 133 | // Usual invariant: all dirty cards are logged in the DirtyCardQueueSet. |
ysr@777 | 134 | class G1SATBCardTableLoggingModRefBS: public G1SATBCardTableModRefBS { |
ysr@777 | 135 | private: |
ysr@777 | 136 | DirtyCardQueueSet& _dcqs; |
ysr@777 | 137 | public: |
ysr@777 | 138 | G1SATBCardTableLoggingModRefBS(MemRegion whole_heap, |
ysr@777 | 139 | int max_covered_regions); |
ysr@777 | 140 | |
ysr@777 | 141 | bool is_a(BarrierSet::Name bsn) { |
ysr@777 | 142 | return bsn == BarrierSet::G1SATBCTLogging || |
ysr@777 | 143 | G1SATBCardTableModRefBS::is_a(bsn); |
ysr@777 | 144 | } |
ysr@777 | 145 | |
goetz@6493 | 146 | void write_ref_field_work(void* field, oop new_val, bool release = false); |
ysr@777 | 147 | |
ysr@777 | 148 | // Can be called from static contexts. |
ysr@777 | 149 | static void write_ref_field_static(void* field, oop new_val); |
ysr@777 | 150 | |
ysr@777 | 151 | // NB: if you do a whole-heap invalidation, the "usual invariant" defined |
ysr@777 | 152 | // above no longer applies. |
ysr@777 | 153 | void invalidate(MemRegion mr, bool whole_heap = false); |
ysr@777 | 154 | |
ysr@777 | 155 | void write_region_work(MemRegion mr) { invalidate(mr); } |
ysr@777 | 156 | void write_ref_array_work(MemRegion mr) { invalidate(mr); } |
ysr@777 | 157 | |
ysr@777 | 158 | |
ysr@777 | 159 | }; |
ysr@777 | 160 | |
ysr@777 | 161 | |
jprovino@4542 | 162 | #endif // INCLUDE_ALL_GCS |
stefank@2314 | 163 | |
stefank@2314 | 164 | #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP |