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annotate src/share/vm/oops/instanceRefKlass.cpp @ 12355:cefad50507d8

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Merge with hs25-b53
author Gilles Duboscq <duboscq@ssw.jku.at>
date Fri, 11 Oct 2013 10:38:03 +0200
parents 190899198332
children 78bbf4d43a14
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1 /*
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2 * Copyright (c) 1997, 2013, 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 #include "precompiled.hpp"
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26 #include "classfile/javaClasses.hpp"
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27 #include "classfile/systemDictionary.hpp"
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28 #include "gc_implementation/shared/markSweep.inline.hpp"
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29 #include "gc_interface/collectedHeap.hpp"
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30 #include "gc_interface/collectedHeap.inline.hpp"
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31 #include "memory/genCollectedHeap.hpp"
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32 #include "memory/genOopClosures.inline.hpp"
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33 #include "oops/instanceRefKlass.hpp"
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34 #include "oops/oop.inline.hpp"
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35 #include "utilities/preserveException.hpp"
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36 #include "utilities/macros.hpp"
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37 #if INCLUDE_ALL_GCS
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38 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
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39 #include "gc_implementation/g1/g1OopClosures.inline.hpp"
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40 #include "gc_implementation/g1/g1RemSet.inline.hpp"
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41 #include "gc_implementation/g1/heapRegionSeq.inline.hpp"
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42 #include "gc_implementation/parNew/parOopClosures.inline.hpp"
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43 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp"
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44 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp"
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45 #include "oops/oop.pcgc.inline.hpp"
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46 #endif // INCLUDE_ALL_GCS
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47
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48 template <class T>
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49 void specialized_oop_follow_contents(InstanceRefKlass* ref, oop obj) {
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50 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
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51 T heap_oop = oopDesc::load_heap_oop(referent_addr);
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52 debug_only(
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53 if(TraceReferenceGC && PrintGCDetails) {
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54 gclog_or_tty->print_cr("InstanceRefKlass::oop_follow_contents " INTPTR_FORMAT, (void *)obj);
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55 }
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56 )
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57 if (!oopDesc::is_null(heap_oop)) {
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58 oop referent = oopDesc::decode_heap_oop_not_null(heap_oop);
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59 if (!referent->is_gc_marked() &&
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60 MarkSweep::ref_processor()->discover_reference(obj, ref->reference_type())) {
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61 // reference was discovered, referent will be traversed later
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62 ref->InstanceKlass::oop_follow_contents(obj);
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63 debug_only(
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64 if(TraceReferenceGC && PrintGCDetails) {
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65 gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, (void *)obj);
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66 }
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67 )
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68 return;
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69 } else {
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70 // treat referent as normal oop
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71 debug_only(
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72 if(TraceReferenceGC && PrintGCDetails) {
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73 gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, (void *)obj);
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74 }
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75 )
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76 MarkSweep::mark_and_push(referent_addr);
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77 }
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78 }
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79 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
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80 if (ReferenceProcessor::pending_list_uses_discovered_field()) {
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81 // Treat discovered as normal oop, if ref is not "active",
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82 // i.e. if next is non-NULL.
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83 T next_oop = oopDesc::load_heap_oop(next_addr);
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84 if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active"
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85 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
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86 debug_only(
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87 if(TraceReferenceGC && PrintGCDetails) {
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88 gclog_or_tty->print_cr(" Process discovered as normal "
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89 INTPTR_FORMAT, discovered_addr);
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90 }
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91 )
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92 MarkSweep::mark_and_push(discovered_addr);
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93 }
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94 } else {
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95 #ifdef ASSERT
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96 // In the case of older JDKs which do not use the discovered
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97 // field for the pending list, an inactive ref (next != NULL)
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98 // must always have a NULL discovered field.
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99 oop next = oopDesc::load_decode_heap_oop(next_addr);
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100 oop discovered = java_lang_ref_Reference::discovered(obj);
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101 assert(oopDesc::is_null(next) || oopDesc::is_null(discovered),
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102 err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field",
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103 (oopDesc*)obj));
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104 #endif
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105 }
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106 // treat next as normal oop. next is a link in the reference queue.
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107 debug_only(
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108 if(TraceReferenceGC && PrintGCDetails) {
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109 gclog_or_tty->print_cr(" Process next as normal " INTPTR_FORMAT, next_addr);
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110 }
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111 )
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112 MarkSweep::mark_and_push(next_addr);
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113 ref->InstanceKlass::oop_follow_contents(obj);
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114 }
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115
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116 void InstanceRefKlass::oop_follow_contents(oop obj) {
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117 if (UseCompressedOops) {
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118 specialized_oop_follow_contents<narrowOop>(this, obj);
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119 } else {
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120 specialized_oop_follow_contents<oop>(this, obj);
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121 }
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122 }
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123
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124 #if INCLUDE_ALL_GCS
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125 template <class T>
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126 void specialized_oop_follow_contents(InstanceRefKlass* ref,
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127 ParCompactionManager* cm,
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128 oop obj) {
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129 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
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130 T heap_oop = oopDesc::load_heap_oop(referent_addr);
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131 debug_only(
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132 if(TraceReferenceGC && PrintGCDetails) {
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133 gclog_or_tty->print_cr("InstanceRefKlass::oop_follow_contents " INTPTR_FORMAT, (void *)obj);
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134 }
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135 )
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136 if (!oopDesc::is_null(heap_oop)) {
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137 oop referent = oopDesc::decode_heap_oop_not_null(heap_oop);
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138 if (PSParallelCompact::mark_bitmap()->is_unmarked(referent) &&
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139 PSParallelCompact::ref_processor()->
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140 discover_reference(obj, ref->reference_type())) {
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141 // reference already enqueued, referent will be traversed later
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142 ref->InstanceKlass::oop_follow_contents(cm, obj);
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143 debug_only(
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144 if(TraceReferenceGC && PrintGCDetails) {
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145 gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, (void *)obj);
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146 }
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147 )
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148 return;
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149 } else {
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150 // treat referent as normal oop
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151 debug_only(
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152 if(TraceReferenceGC && PrintGCDetails) {
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153 gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, (void *)obj);
0
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154 }
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155 )
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156 PSParallelCompact::mark_and_push(cm, referent_addr);
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157 }
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158 }
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159 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
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160 if (ReferenceProcessor::pending_list_uses_discovered_field()) {
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161 // Treat discovered as normal oop, if ref is not "active",
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162 // i.e. if next is non-NULL.
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163 T next_oop = oopDesc::load_heap_oop(next_addr);
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164 if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active"
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165 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
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166 debug_only(
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167 if(TraceReferenceGC && PrintGCDetails) {
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168 gclog_or_tty->print_cr(" Process discovered as normal "
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169 INTPTR_FORMAT, discovered_addr);
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170 }
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171 )
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172 PSParallelCompact::mark_and_push(cm, discovered_addr);
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173 }
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174 } else {
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175 #ifdef ASSERT
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176 // In the case of older JDKs which do not use the discovered
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177 // field for the pending list, an inactive ref (next != NULL)
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178 // must always have a NULL discovered field.
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179 T next = oopDesc::load_heap_oop(next_addr);
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180 oop discovered = java_lang_ref_Reference::discovered(obj);
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181 assert(oopDesc::is_null(next) || oopDesc::is_null(discovered),
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182 err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field",
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183 (oopDesc*)obj));
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184 #endif
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185 }
0
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186 PSParallelCompact::mark_and_push(cm, next_addr);
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187 ref->InstanceKlass::oop_follow_contents(cm, obj);
113
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188 }
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189
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190 void InstanceRefKlass::oop_follow_contents(ParCompactionManager* cm,
113
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191 oop obj) {
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192 if (UseCompressedOops) {
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193 specialized_oop_follow_contents<narrowOop>(this, cm, obj);
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194 } else {
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195 specialized_oop_follow_contents<oop>(this, cm, obj);
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196 }
0
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197 }
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198 #endif // INCLUDE_ALL_GCS
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199
113
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200 #ifdef ASSERT
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201 template <class T> void trace_reference_gc(const char *s, oop obj,
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202 T* referent_addr,
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203 T* next_addr,
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204 T* discovered_addr) {
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205 if(TraceReferenceGC && PrintGCDetails) {
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206 gclog_or_tty->print_cr("%s obj " INTPTR_FORMAT, s, (address)obj);
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207 gclog_or_tty->print_cr(" referent_addr/* " INTPTR_FORMAT " / "
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208 INTPTR_FORMAT, referent_addr,
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209 referent_addr ?
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210 (address)oopDesc::load_decode_heap_oop(referent_addr) : NULL);
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211 gclog_or_tty->print_cr(" next_addr/* " INTPTR_FORMAT " / "
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212 INTPTR_FORMAT, next_addr,
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213 next_addr ? (address)oopDesc::load_decode_heap_oop(next_addr) : NULL);
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214 gclog_or_tty->print_cr(" discovered_addr/* " INTPTR_FORMAT " / "
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215 INTPTR_FORMAT, discovered_addr,
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216 discovered_addr ?
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217 (address)oopDesc::load_decode_heap_oop(discovered_addr) : NULL);
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218 }
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219 }
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220 #endif
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221
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222 template <class T> void specialized_oop_adjust_pointers(InstanceRefKlass *ref, oop obj) {
113
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223 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
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224 MarkSweep::adjust_pointer(referent_addr);
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225 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
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226 MarkSweep::adjust_pointer(next_addr);
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227 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
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228 MarkSweep::adjust_pointer(discovered_addr);
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229 debug_only(trace_reference_gc("InstanceRefKlass::oop_adjust_pointers", obj,
113
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230 referent_addr, next_addr, discovered_addr);)
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231 }
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232
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233 int InstanceRefKlass::oop_adjust_pointers(oop obj) {
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234 int size = size_helper();
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235 InstanceKlass::oop_adjust_pointers(obj);
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236
113
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237 if (UseCompressedOops) {
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238 specialized_oop_adjust_pointers<narrowOop>(this, obj);
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239 } else {
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240 specialized_oop_adjust_pointers<oop>(this, obj);
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241 }
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242 return size;
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243 }
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244
113
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245 #define InstanceRefKlass_SPECIALIZED_OOP_ITERATE(T, nv_suffix, contains) \
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246 T* disc_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); \
342
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247 if (closure->apply_to_weak_ref_discovered_field()) { \
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248 closure->do_oop##nv_suffix(disc_addr); \
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249 } \
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250 \
113
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251 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); \
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252 T heap_oop = oopDesc::load_heap_oop(referent_addr); \
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253 ReferenceProcessor* rp = closure->_ref_processor; \
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254 if (!oopDesc::is_null(heap_oop)) { \
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255 oop referent = oopDesc::decode_heap_oop_not_null(heap_oop); \
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256 if (!referent->is_gc_marked() && (rp != NULL) && \
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257 rp->discover_reference(obj, reference_type())) { \
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258 return size; \
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259 } else if (contains(referent_addr)) { \
113
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260 /* treat referent as normal oop */ \
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261 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\
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262 closure->do_oop##nv_suffix(referent_addr); \
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263 } \
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264 } \
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265 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); \
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266 if (ReferenceProcessor::pending_list_uses_discovered_field()) { \
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267 T next_oop = oopDesc::load_heap_oop(next_addr); \
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268 /* Treat discovered as normal oop, if ref is not "active" (next non-NULL) */\
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269 if (!oopDesc::is_null(next_oop) && contains(disc_addr)) { \
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270 /* i.e. ref is not "active" */ \
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271 debug_only( \
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272 if(TraceReferenceGC && PrintGCDetails) { \
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273 gclog_or_tty->print_cr(" Process discovered as normal " \
eca1193ca245 4965777: GC changes to support use of discovered field for pending references
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274 INTPTR_FORMAT, disc_addr); \
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275 } \
eca1193ca245 4965777: GC changes to support use of discovered field for pending references
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276 ) \
eca1193ca245 4965777: GC changes to support use of discovered field for pending references
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277 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\
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278 closure->do_oop##nv_suffix(disc_addr); \
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279 } \
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280 } else { \
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281 /* In the case of older JDKs which do not use the discovered field for */ \
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282 /* the pending list, an inactive ref (next != NULL) must always have a */ \
eca1193ca245 4965777: GC changes to support use of discovered field for pending references
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283 /* NULL discovered field. */ \
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diff changeset
284 debug_only( \
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diff changeset
285 T next_oop = oopDesc::load_heap_oop(next_addr); \
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286 T disc_oop = oopDesc::load_heap_oop(disc_addr); \
eca1193ca245 4965777: GC changes to support use of discovered field for pending references
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diff changeset
287 assert(oopDesc::is_null(next_oop) || oopDesc::is_null(disc_oop), \
eca1193ca245 4965777: GC changes to support use of discovered field for pending references
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diff changeset
288 err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL" \
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diff changeset
289 "discovered field", (oopDesc*)obj)); \
3917
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diff changeset
290 ) \
eca1193ca245 4965777: GC changes to support use of discovered field for pending references
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diff changeset
291 } \
113
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diff changeset
292 /* treat next as normal oop */ \
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diff changeset
293 if (contains(next_addr)) { \
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diff changeset
294 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk); \
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diff changeset
295 closure->do_oop##nv_suffix(next_addr); \
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296 } \
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297 return size; \
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298
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299
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300 template <class T> bool contains(T *t) { return true; }
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301
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302 // Macro to define InstanceRefKlass::oop_oop_iterate for virtual/nonvirtual for
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303 // all closures. Macros calling macros above for each oop size.
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304
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305 #define InstanceRefKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \
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306 \
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307 int InstanceRefKlass:: \
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308 oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \
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309 /* Get size before changing pointers */ \
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310 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
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311 \
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312 int size = InstanceKlass::oop_oop_iterate##nv_suffix(obj, closure); \
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313 \
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314 if (UseCompressedOops) { \
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315 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, contains); \
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316 } else { \
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317 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, contains); \
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318 } \
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319 }
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320
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321 #if INCLUDE_ALL_GCS
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322 #define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \
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323 \
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324 int InstanceRefKlass:: \
342
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325 oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure) { \
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326 /* Get size before changing pointers */ \
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327 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
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328 \
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329 int size = InstanceKlass::oop_oop_iterate_backwards##nv_suffix(obj, closure); \
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330 \
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331 if (UseCompressedOops) { \
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332 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, contains); \
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333 } else { \
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334 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, contains); \
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335 } \
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336 }
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337 #endif // INCLUDE_ALL_GCS
342
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338
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339
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340 #define InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \
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341 \
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342 int InstanceRefKlass:: \
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343 oop_oop_iterate##nv_suffix##_m(oop obj, \
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344 OopClosureType* closure, \
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345 MemRegion mr) { \
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346 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
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347 \
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348 int size = InstanceKlass::oop_oop_iterate##nv_suffix##_m(obj, closure, mr); \
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349 if (UseCompressedOops) { \
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350 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, mr.contains); \
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351 } else { \
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352 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, mr.contains); \
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353 } \
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354 }
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355
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356 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN)
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357 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN)
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358 #if INCLUDE_ALL_GCS
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359 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
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360 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
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361 #endif // INCLUDE_ALL_GCS
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362 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m)
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363 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m)
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364
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365 #if INCLUDE_ALL_GCS
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366 template <class T>
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367 void specialized_oop_push_contents(InstanceRefKlass *ref,
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368 PSPromotionManager* pm, oop obj) {
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369 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
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370 if (PSScavenge::should_scavenge(referent_addr)) {
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371 ReferenceProcessor* rp = PSScavenge::reference_processor();
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372 if (rp->discover_reference(obj, ref->reference_type())) {
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373 // reference already enqueued, referent and next will be traversed later
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374 ref->InstanceKlass::oop_push_contents(pm, obj);
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375 return;
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376 } else {
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377 // treat referent as normal oop
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378 pm->claim_or_forward_depth(referent_addr);
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379 }
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380 }
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381 // Treat discovered as normal oop, if ref is not "active",
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382 // i.e. if next is non-NULL.
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383 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
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384 if (ReferenceProcessor::pending_list_uses_discovered_field()) {
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385 T next_oop = oopDesc::load_heap_oop(next_addr);
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386 if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active"
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387 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
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388 debug_only(
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389 if(TraceReferenceGC && PrintGCDetails) {
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390 gclog_or_tty->print_cr(" Process discovered as normal "
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391 INTPTR_FORMAT, discovered_addr);
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392 }
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393 )
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394 if (PSScavenge::should_scavenge(discovered_addr)) {
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395 pm->claim_or_forward_depth(discovered_addr);
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396 }
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397 }
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398 } else {
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399 #ifdef ASSERT
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400 // In the case of older JDKs which do not use the discovered
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401 // field for the pending list, an inactive ref (next != NULL)
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402 // must always have a NULL discovered field.
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403 oop next = oopDesc::load_decode_heap_oop(next_addr);
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404 oop discovered = java_lang_ref_Reference::discovered(obj);
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405 assert(oopDesc::is_null(next) || oopDesc::is_null(discovered),
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406 err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field",
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407 (oopDesc*)obj));
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408 #endif
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409 }
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410
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411 // Treat next as normal oop; next is a link in the reference queue.
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412 if (PSScavenge::should_scavenge(next_addr)) {
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413 pm->claim_or_forward_depth(next_addr);
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414 }
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415 ref->InstanceKlass::oop_push_contents(pm, obj);
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416 }
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417
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418 void InstanceRefKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
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419 if (UseCompressedOops) {
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420 specialized_oop_push_contents<narrowOop>(this, pm, obj);
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421 } else {
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422 specialized_oop_push_contents<oop>(this, pm, obj);
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423 }
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424 }
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425
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426 template <class T>
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427 void specialized_oop_update_pointers(InstanceRefKlass *ref,
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428 ParCompactionManager* cm, oop obj) {
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429 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
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430 PSParallelCompact::adjust_pointer(referent_addr);
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431 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
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432 PSParallelCompact::adjust_pointer(next_addr);
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433 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
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434 PSParallelCompact::adjust_pointer(discovered_addr);
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435 debug_only(trace_reference_gc("InstanceRefKlass::oop_update_ptrs", obj,
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436 referent_addr, next_addr, discovered_addr);)
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437 }
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438
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439 int InstanceRefKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
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440 InstanceKlass::oop_update_pointers(cm, obj);
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441 if (UseCompressedOops) {
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442 specialized_oop_update_pointers<narrowOop>(this, cm, obj);
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443 } else {
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444 specialized_oop_update_pointers<oop>(this, cm, obj);
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445 }
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446 return size_helper();
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447 }
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448 #endif // INCLUDE_ALL_GCS
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449
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450 void InstanceRefKlass::update_nonstatic_oop_maps(Klass* k) {
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451 // Clear the nonstatic oop-map entries corresponding to referent
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452 // and nextPending field. They are treated specially by the
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453 // garbage collector.
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454 // The discovered field is used only by the garbage collector
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455 // and is also treated specially.
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456 InstanceKlass* ik = InstanceKlass::cast(k);
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457
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458 // Check that we have the right class
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459 debug_only(static bool first_time = true);
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460 assert(k == SystemDictionary::Reference_klass() && first_time,
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461 "Invalid update of maps");
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462 debug_only(first_time = false);
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463 assert(ik->nonstatic_oop_map_count() == 1, "just checking");
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464
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465 OopMapBlock* map = ik->start_of_nonstatic_oop_maps();
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466
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467 // Check that the current map is (2,4) - currently points at field with
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468 // offset 2 (words) and has 4 map entries.
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469 debug_only(int offset = java_lang_ref_Reference::referent_offset);
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470 debug_only(unsigned int count = ((java_lang_ref_Reference::discovered_offset -
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471 java_lang_ref_Reference::referent_offset)/heapOopSize) + 1);
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472
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473 if (UseSharedSpaces) {
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474 assert(map->offset() == java_lang_ref_Reference::queue_offset &&
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475 map->count() == 1, "just checking");
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476 } else {
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477 assert(map->offset() == offset && map->count() == count,
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478 "just checking");
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479
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480 // Update map to (3,1) - point to offset of 3 (words) with 1 map entry.
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481 map->set_offset(java_lang_ref_Reference::queue_offset);
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482 map->set_count(1);
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483 }
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484 }
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485
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486
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487 // Verification
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488
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489 void InstanceRefKlass::oop_verify_on(oop obj, outputStream* st) {
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490 InstanceKlass::oop_verify_on(obj, st);
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491 // Verify referent field
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492 oop referent = java_lang_ref_Reference::referent(obj);
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493
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494 // We should make this general to all heaps
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495 GenCollectedHeap* gch = NULL;
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496 if (Universe::heap()->kind() == CollectedHeap::GenCollectedHeap)
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497 gch = GenCollectedHeap::heap();
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498
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499 if (referent != NULL) {
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500 guarantee(referent->is_oop(), "referent field heap failed");
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501 }
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502 // Verify next field
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503 oop next = java_lang_ref_Reference::next(obj);
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504 if (next != NULL) {
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505 guarantee(next->is_oop(), "next field verify failed");
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506 guarantee(next->is_instanceRef(), "next field verify failed");
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507 }
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508 }
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509
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510 bool InstanceRefKlass::owns_pending_list_lock(JavaThread* thread) {
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coleenp
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511 if (java_lang_ref_Reference::pending_list_lock() == NULL) return false;
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coleenp
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512 Handle h_lock(thread, java_lang_ref_Reference::pending_list_lock());
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513 return ObjectSynchronizer::current_thread_holds_lock(thread, h_lock);
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514 }
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515
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516 void InstanceRefKlass::acquire_pending_list_lock(BasicLock *pending_list_basic_lock) {
0
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517 // we may enter this with pending exception set
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518 PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument
6108
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johnc
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519
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johnc
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520 // Create a HandleMark in case we retry a GC multiple times.
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diff changeset
521 // Each time we attempt the GC, we allocate the handle below
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johnc
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522 // to hold the pending list lock. We want to free this handle.
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diff changeset
523 HandleMark hm;
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524
0
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525 Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock());
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526 ObjectSynchronizer::fast_enter(h_lock, pending_list_basic_lock, false, THREAD);
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527 assert(ObjectSynchronizer::current_thread_holds_lock(
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528 JavaThread::current(), h_lock),
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529 "Locking should have succeeded");
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530 if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION;
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531 }
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532
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coleenp
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diff changeset
533 void InstanceRefKlass::release_and_notify_pending_list_lock(
0
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534 BasicLock *pending_list_basic_lock) {
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535 // we may enter this with pending exception set
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536 PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument
6108
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johnc
parents: 6008
diff changeset
537
c52a6a39546c 7158682: G1: Handle leak when running nsk.sysdict tests
johnc
parents: 6008
diff changeset
538 // Create a HandleMark in case we retry a GC multiple times.
c52a6a39546c 7158682: G1: Handle leak when running nsk.sysdict tests
johnc
parents: 6008
diff changeset
539 // Each time we attempt the GC, we allocate the handle below
c52a6a39546c 7158682: G1: Handle leak when running nsk.sysdict tests
johnc
parents: 6008
diff changeset
540 // to hold the pending list lock. We want to free this handle.
c52a6a39546c 7158682: G1: Handle leak when running nsk.sysdict tests
johnc
parents: 6008
diff changeset
541 HandleMark hm;
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johnc
parents: 6008
diff changeset
542
0
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543 Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock());
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544 assert(ObjectSynchronizer::current_thread_holds_lock(
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545 JavaThread::current(), h_lock),
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546 "Lock should be held");
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547 // Notify waiters on pending lists lock if there is any reference.
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548 if (java_lang_ref_Reference::pending_list() != NULL) {
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549 ObjectSynchronizer::notifyall(h_lock, THREAD);
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550 }
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551 ObjectSynchronizer::fast_exit(h_lock(), pending_list_basic_lock, THREAD);
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552 if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION;
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553 }