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annotate src/share/vm/gc_implementation/g1/heapRegionSet.inline.hpp @ 20652:e8bf410d5e23

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8058209: Race in G1 card scanning could allow scanning of memory covered by PLABs Summary: Read _top before _gc_time_stamp in saved_mark_word() with LoadLoad order to ensure we get a consistent view Reviewed-by: brutisso, dcubed, dholmes, stefank
author mgerdin
date Fri, 14 Nov 2014 14:23:25 +0100
parents a8ea2f110d87
children 7848fc12602b
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1 /*
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2 * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_INLINE_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_INLINE_HPP
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27
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28 #include "gc_implementation/g1/heapRegionSet.hpp"
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29
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30 inline void HeapRegionSetBase::add(HeapRegion* hr) {
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31 check_mt_safety();
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32 assert(hr->containing_set() == NULL, hrs_ext_msg(this, "should not already have a containing set %u"));
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33 assert(hr->next() == NULL, hrs_ext_msg(this, "should not already be linked"));
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34 assert(hr->prev() == NULL, hrs_ext_msg(this, "should not already be linked"));
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35
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36 _count.increment(1u, hr->capacity());
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37 hr->set_containing_set(this);
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38 verify_region(hr);
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39 }
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40
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41 inline void HeapRegionSetBase::remove(HeapRegion* hr) {
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42 check_mt_safety();
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43 verify_region(hr);
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44 assert(hr->next() == NULL, hrs_ext_msg(this, "should already be unlinked"));
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45 assert(hr->prev() == NULL, hrs_ext_msg(this, "should already be unlinked"));
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46
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47 hr->set_containing_set(NULL);
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48 assert(_count.length() > 0, hrs_ext_msg(this, "pre-condition"));
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49 _count.decrement(1u, hr->capacity());
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50 }
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51
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52 inline void FreeRegionList::add_ordered(HeapRegion* hr) {
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53 assert((length() == 0 && _head == NULL && _tail == NULL && _last == NULL) ||
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54 (length() > 0 && _head != NULL && _tail != NULL),
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55 hrs_ext_msg(this, "invariant"));
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56 // add() will verify the region and check mt safety.
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57 add(hr);
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58
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59 // Now link the region
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60 if (_head != NULL) {
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61 HeapRegion* curr;
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62
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63 if (_last != NULL && _last->hrm_index() < hr->hrm_index()) {
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64 curr = _last;
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65 } else {
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66 curr = _head;
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67 }
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68
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69 // Find first entry with a Region Index larger than entry to insert.
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70 while (curr != NULL && curr->hrm_index() < hr->hrm_index()) {
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71 curr = curr->next();
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72 }
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73
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74 hr->set_next(curr);
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75
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76 if (curr == NULL) {
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77 // Adding at the end
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78 hr->set_prev(_tail);
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79 _tail->set_next(hr);
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80 _tail = hr;
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81 } else if (curr->prev() == NULL) {
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82 // Adding at the beginning
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83 hr->set_prev(NULL);
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84 _head = hr;
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85 curr->set_prev(hr);
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86 } else {
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87 hr->set_prev(curr->prev());
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88 hr->prev()->set_next(hr);
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89 curr->set_prev(hr);
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90 }
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91 } else {
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92 // The list was empty
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93 _tail = hr;
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94 _head = hr;
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95 }
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96 _last = hr;
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97 }
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98
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99 inline HeapRegion* FreeRegionList::remove_from_head_impl() {
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100 HeapRegion* result = _head;
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101 _head = result->next();
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102 if (_head == NULL) {
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103 _tail = NULL;
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104 } else {
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105 _head->set_prev(NULL);
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106 }
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107 result->set_next(NULL);
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108 return result;
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109 }
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110
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111 inline HeapRegion* FreeRegionList::remove_from_tail_impl() {
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112 HeapRegion* result = _tail;
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113
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114 _tail = result->prev();
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115 if (_tail == NULL) {
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116 _head = NULL;
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117 } else {
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118 _tail->set_next(NULL);
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119 }
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120 result->set_prev(NULL);
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121 return result;
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122 }
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123
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124 inline HeapRegion* FreeRegionList::remove_region(bool from_head) {
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125 check_mt_safety();
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126 verify_optional();
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127
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128 if (is_empty()) {
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129 return NULL;
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130 }
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131 assert(length() > 0 && _head != NULL && _tail != NULL,
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132 hrs_ext_msg(this, "invariant"));
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133
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134 HeapRegion* hr;
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135
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136 if (from_head) {
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137 hr = remove_from_head_impl();
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138 } else {
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139 hr = remove_from_tail_impl();
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140 }
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141
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142 if (_last == hr) {
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143 _last = NULL;
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144 }
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145
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146 // remove() will verify the region and check mt safety.
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147 remove(hr);
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148 return hr;
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149 }
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150
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151 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_INLINE_HPP
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152