Mercurial > hg > truffle
annotate src/share/vm/oops/instanceRefKlass.cpp @ 14714:b602356a9cfc
additional canonicalizers for accesses and value nodes (improves number of implicit null checks)
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Thu, 20 Mar 2014 17:15:36 +0100 |
parents | 190899198332 |
children | 78bbf4d43a14 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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 #include "precompiled.hpp" |
26 #include "classfile/javaClasses.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "gc_implementation/shared/markSweep.inline.hpp" | |
29 #include "gc_interface/collectedHeap.hpp" | |
30 #include "gc_interface/collectedHeap.inline.hpp" | |
31 #include "memory/genCollectedHeap.hpp" | |
32 #include "memory/genOopClosures.inline.hpp" | |
33 #include "oops/instanceRefKlass.hpp" | |
34 #include "oops/oop.inline.hpp" | |
35 #include "utilities/preserveException.hpp" | |
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36 #include "utilities/macros.hpp" |
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37 #if INCLUDE_ALL_GCS |
1972 | 38 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
39 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
40 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
41 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
42 #include "gc_implementation/parNew/parOopClosures.inline.hpp" | |
43 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp" | |
44 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp" | |
45 #include "oops/oop.pcgc.inline.hpp" | |
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46 #endif // INCLUDE_ALL_GCS |
0 | 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); |
0 | 52 debug_only( |
53 if(TraceReferenceGC && PrintGCDetails) { | |
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54 gclog_or_tty->print_cr("InstanceRefKlass::oop_follow_contents " INTPTR_FORMAT, (void *)obj); |
0 | 55 } |
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); |
0 | 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 |
0 | 71 debug_only( |
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); |
0 | 146 } |
147 ) | |
148 return; | |
149 } else { | |
150 // treat referent as normal oop | |
151 debug_only( | |
152 if(TraceReferenceGC && PrintGCDetails) { | |
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153 gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, (void *)obj); |
0 | 154 } |
155 ) | |
156 PSParallelCompact::mark_and_push(cm, referent_addr); | |
157 } | |
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); |
0 | 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 | 186 PSParallelCompact::mark_and_push(cm, next_addr); |
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187 ref->InstanceKlass::oop_follow_contents(cm, obj); |
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188 } |
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189 |
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190 void InstanceRefKlass::oop_follow_contents(ParCompactionManager* cm, |
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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 | 197 } |
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198 #endif // INCLUDE_ALL_GCS |
0 | 199 |
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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) { |
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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, |
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230 referent_addr, next_addr, discovered_addr);) |
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231 } |
0 | 232 |
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233 int InstanceRefKlass::oop_adjust_pointers(oop obj) { |
0 | 234 int size = size_helper(); |
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235 InstanceKlass::oop_adjust_pointers(obj); |
0 | 236 |
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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); |
0 | 241 } |
242 return size; | |
243 } | |
244 | |
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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); \ |
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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 \ |
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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)) { \ |
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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 " \ |
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274 INTPTR_FORMAT, disc_addr); \ |
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275 } \ |
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276 ) \ |
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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 */ \ |
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283 /* NULL discovered field. */ \ |
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284 debug_only( \ |
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285 T next_oop = oopDesc::load_heap_oop(next_addr); \ |
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286 T disc_oop = oopDesc::load_heap_oop(disc_addr); \ |
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287 assert(oopDesc::is_null(next_oop) || oopDesc::is_null(disc_oop), \ |
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288 err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL" \ |
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289 "discovered field", (oopDesc*)obj)); \ |
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290 ) \ |
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291 } \ |
113
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292 /* treat next as normal oop */ \ |
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293 if (contains(next_addr)) { \ |
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294 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk); \ |
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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 |
0 | 305 #define InstanceRefKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ |
306 \ | |
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307 int InstanceRefKlass:: \ |
0 | 308 oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \ |
309 /* Get size before changing pointers */ \ | |
310 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\ | |
311 \ | |
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312 int size = InstanceKlass::oop_oop_iterate##nv_suffix(obj, closure); \ |
0 | 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); \ |
0 | 318 } \ |
319 } | |
320 | |
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321 #if INCLUDE_ALL_GCS |
342
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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); \ |
342
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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 |
0 | 340 #define InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \ |
341 \ | |
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342 int InstanceRefKlass:: \ |
0 | 343 oop_oop_iterate##nv_suffix##_m(oop obj, \ |
344 OopClosureType* closure, \ | |
345 MemRegion mr) { \ | |
346 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\ | |
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); \ |
0 | 353 } \ |
354 } | |
355 | |
356 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN) | |
342
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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 |
342
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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 |
0 | 362 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m) |
342
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363 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m) |
0 | 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)) { |
0 | 371 ReferenceProcessor* rp = PSScavenge::reference_processor(); |
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372 if (rp->discover_reference(obj, ref->reference_type())) { |
0 | 373 // reference already enqueued, referent and next will be traversed later |
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374 ref->InstanceKlass::oop_push_contents(pm, obj); |
0 | 375 return; |
376 } else { | |
377 // treat referent as normal oop | |
378 pm->claim_or_forward_depth(referent_addr); | |
379 } | |
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)) { |
0 | 413 pm->claim_or_forward_depth(next_addr); |
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);) |
0 | 437 } |
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 |
0 | 449 |
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450 void InstanceRefKlass::update_nonstatic_oop_maps(Klass* k) { |
0 | 451 // Clear the nonstatic oop-map entries corresponding to referent |
452 // and nextPending field. They are treated specially by the | |
453 // garbage collector. | |
454 // The discovered field is used only by the garbage collector | |
455 // and is also treated specially. | |
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456 InstanceKlass* ik = InstanceKlass::cast(k); |
0 | 457 |
458 // Check that we have the right class | |
459 debug_only(static bool first_time = true); | |
1142 | 460 assert(k == SystemDictionary::Reference_klass() && first_time, |
0 | 461 "Invalid update of maps"); |
462 debug_only(first_time = false); | |
938 | 463 assert(ik->nonstatic_oop_map_count() == 1, "just checking"); |
0 | 464 |
465 OopMapBlock* map = ik->start_of_nonstatic_oop_maps(); | |
466 | |
467 // Check that the current map is (2,4) - currently points at field with | |
468 // offset 2 (words) and has 4 map entries. | |
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); |
0 | 472 |
473 if (UseSharedSpaces) { | |
474 assert(map->offset() == java_lang_ref_Reference::queue_offset && | |
938 | 475 map->count() == 1, "just checking"); |
0 | 476 } else { |
938 | 477 assert(map->offset() == offset && map->count() == count, |
0 | 478 "just checking"); |
479 | |
480 // Update map to (3,1) - point to offset of 3 (words) with 1 map entry. | |
481 map->set_offset(java_lang_ref_Reference::queue_offset); | |
938 | 482 map->set_count(1); |
0 | 483 } |
484 } | |
485 | |
486 | |
487 // Verification | |
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); |
0 | 491 // Verify referent field |
492 oop referent = java_lang_ref_Reference::referent(obj); | |
493 | |
494 // We should make this general to all heaps | |
495 GenCollectedHeap* gch = NULL; | |
496 if (Universe::heap()->kind() == CollectedHeap::GenCollectedHeap) | |
497 gch = GenCollectedHeap::heap(); | |
498 | |
499 if (referent != NULL) { | |
500 guarantee(referent->is_oop(), "referent field heap failed"); | |
501 } | |
502 // Verify next field | |
503 oop next = java_lang_ref_Reference::next(obj); | |
504 if (next != NULL) { | |
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505 guarantee(next->is_oop(), "next field verify failed"); |
0 | 506 guarantee(next->is_instanceRef(), "next field verify failed"); |
507 } | |
508 } | |
509 | |
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510 bool InstanceRefKlass::owns_pending_list_lock(JavaThread* thread) { |
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511 if (java_lang_ref_Reference::pending_list_lock() == NULL) return false; |
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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 | 517 // we may enter this with pending exception set |
518 PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument | |
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519 |
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520 // Create a HandleMark in case we retry a GC multiple times. |
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521 // Each time we attempt the GC, we allocate the handle below |
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522 // to hold the pending list lock. We want to free this handle. |
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523 HandleMark hm; |
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524 |
0 | 525 Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock()); |
526 ObjectSynchronizer::fast_enter(h_lock, pending_list_basic_lock, false, THREAD); | |
527 assert(ObjectSynchronizer::current_thread_holds_lock( | |
528 JavaThread::current(), h_lock), | |
529 "Locking should have succeeded"); | |
530 if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION; | |
531 } | |
532 | |
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533 void InstanceRefKlass::release_and_notify_pending_list_lock( |
0 | 534 BasicLock *pending_list_basic_lock) { |
535 // we may enter this with pending exception set | |
536 PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument | |
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537 |
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538 // Create a HandleMark in case we retry a GC multiple times. |
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539 // Each time we attempt the GC, we allocate the handle below |
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540 // to hold the pending list lock. We want to free this handle. |
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541 HandleMark hm; |
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542 |
0 | 543 Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock()); |
544 assert(ObjectSynchronizer::current_thread_holds_lock( | |
545 JavaThread::current(), h_lock), | |
546 "Lock should be held"); | |
547 // Notify waiters on pending lists lock if there is any reference. | |
548 if (java_lang_ref_Reference::pending_list() != NULL) { | |
549 ObjectSynchronizer::notifyall(h_lock, THREAD); | |
550 } | |
551 ObjectSynchronizer::fast_exit(h_lock(), pending_list_basic_lock, THREAD); | |
552 if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION; | |
553 } |