Mercurial > hg > graal-compiler
annotate src/share/vm/oops/instanceRefKlass.cpp @ 6781:b711844284e2
7200092: Make NMT a bit friendlier to work with
Reviewed-by: kvn, ysr, azeemj
author | nloodin |
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date | Fri, 21 Sep 2012 10:56:28 +0200 |
parents | aed758eda82a |
children | db9981fd3124 |
rev | line source |
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0 | 1 /* |
6008 | 2 * Copyright (c) 1997, 2012, 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 * | |
1552
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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" | |
36 #ifndef SERIALGC | |
37 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
38 #include "gc_implementation/g1/g1OopClosures.inline.hpp" | |
39 #include "gc_implementation/g1/g1RemSet.inline.hpp" | |
40 #include "gc_implementation/g1/heapRegionSeq.inline.hpp" | |
41 #include "gc_implementation/parNew/parOopClosures.inline.hpp" | |
42 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp" | |
43 #include "gc_implementation/parallelScavenge/psScavenge.inline.hpp" | |
44 #include "oops/oop.pcgc.inline.hpp" | |
45 #endif | |
0 | 46 |
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47 template <class T> |
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48 void specialized_oop_follow_contents(InstanceRefKlass* ref, oop obj) { |
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49 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
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50 T heap_oop = oopDesc::load_heap_oop(referent_addr); |
0 | 51 debug_only( |
52 if(TraceReferenceGC && PrintGCDetails) { | |
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53 gclog_or_tty->print_cr("InstanceRefKlass::oop_follow_contents " INTPTR_FORMAT, obj); |
0 | 54 } |
55 ) | |
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56 if (!oopDesc::is_null(heap_oop)) { |
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57 oop referent = oopDesc::decode_heap_oop_not_null(heap_oop); |
0 | 58 if (!referent->is_gc_marked() && |
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59 MarkSweep::ref_processor()->discover_reference(obj, ref->reference_type())) { |
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60 // reference was discovered, referent will be traversed later |
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61 ref->InstanceKlass::oop_follow_contents(obj); |
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62 debug_only( |
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63 if(TraceReferenceGC && PrintGCDetails) { |
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64 gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, obj); |
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65 } |
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66 ) |
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67 return; |
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68 } else { |
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69 // treat referent as normal oop |
0 | 70 debug_only( |
71 if(TraceReferenceGC && PrintGCDetails) { | |
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72 gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, obj); |
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73 } |
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74 ) |
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75 MarkSweep::mark_and_push(referent_addr); |
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76 } |
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77 } |
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78 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
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79 if (ReferenceProcessor::pending_list_uses_discovered_field()) { |
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80 // Treat discovered as normal oop, if ref is not "active", |
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81 // i.e. if next is non-NULL. |
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82 T next_oop = oopDesc::load_heap_oop(next_addr); |
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83 if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active" |
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84 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); |
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85 debug_only( |
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86 if(TraceReferenceGC && PrintGCDetails) { |
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87 gclog_or_tty->print_cr(" Process discovered as normal " |
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88 INTPTR_FORMAT, discovered_addr); |
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89 } |
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90 ) |
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91 MarkSweep::mark_and_push(discovered_addr); |
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92 } |
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93 } else { |
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94 #ifdef ASSERT |
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95 // In the case of older JDKs which do not use the discovered |
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96 // field for the pending list, an inactive ref (next != NULL) |
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97 // must always have a NULL discovered field. |
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98 oop next = oopDesc::load_decode_heap_oop(next_addr); |
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99 oop discovered = java_lang_ref_Reference::discovered(obj); |
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100 assert(oopDesc::is_null(next) || oopDesc::is_null(discovered), |
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101 err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field", |
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102 (oopDesc*)obj)); |
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103 #endif |
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104 } |
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105 // treat next as normal oop. next is a link in the reference queue. |
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106 debug_only( |
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107 if(TraceReferenceGC && PrintGCDetails) { |
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108 gclog_or_tty->print_cr(" Process next as normal " INTPTR_FORMAT, next_addr); |
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109 } |
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110 ) |
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111 MarkSweep::mark_and_push(next_addr); |
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112 ref->InstanceKlass::oop_follow_contents(obj); |
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113 } |
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114 |
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115 void InstanceRefKlass::oop_follow_contents(oop obj) { |
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116 if (UseCompressedOops) { |
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117 specialized_oop_follow_contents<narrowOop>(this, obj); |
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118 } else { |
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119 specialized_oop_follow_contents<oop>(this, obj); |
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120 } |
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121 } |
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122 |
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123 #ifndef SERIALGC |
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124 template <class T> |
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125 void specialized_oop_follow_contents(InstanceRefKlass* ref, |
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126 ParCompactionManager* cm, |
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127 oop obj) { |
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128 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
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129 T heap_oop = oopDesc::load_heap_oop(referent_addr); |
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130 debug_only( |
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131 if(TraceReferenceGC && PrintGCDetails) { |
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132 gclog_or_tty->print_cr("InstanceRefKlass::oop_follow_contents " INTPTR_FORMAT, obj); |
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133 } |
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134 ) |
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135 if (!oopDesc::is_null(heap_oop)) { |
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136 oop referent = oopDesc::decode_heap_oop_not_null(heap_oop); |
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137 if (PSParallelCompact::mark_bitmap()->is_unmarked(referent) && |
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138 PSParallelCompact::ref_processor()-> |
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139 discover_reference(obj, ref->reference_type())) { |
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140 // reference already enqueued, referent will be traversed later |
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141 ref->InstanceKlass::oop_follow_contents(cm, obj); |
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142 debug_only( |
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143 if(TraceReferenceGC && PrintGCDetails) { |
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144 gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, obj); |
0 | 145 } |
146 ) | |
147 return; | |
148 } else { | |
149 // treat referent as normal oop | |
150 debug_only( | |
151 if(TraceReferenceGC && PrintGCDetails) { | |
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152 gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, obj); |
0 | 153 } |
154 ) | |
155 PSParallelCompact::mark_and_push(cm, referent_addr); | |
156 } | |
157 } | |
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158 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
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159 if (ReferenceProcessor::pending_list_uses_discovered_field()) { |
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160 // Treat discovered as normal oop, if ref is not "active", |
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161 // i.e. if next is non-NULL. |
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162 T next_oop = oopDesc::load_heap_oop(next_addr); |
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163 if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active" |
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164 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); |
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165 debug_only( |
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166 if(TraceReferenceGC && PrintGCDetails) { |
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167 gclog_or_tty->print_cr(" Process discovered as normal " |
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168 INTPTR_FORMAT, discovered_addr); |
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169 } |
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170 ) |
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171 PSParallelCompact::mark_and_push(cm, discovered_addr); |
0 | 172 } |
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173 } else { |
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174 #ifdef ASSERT |
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175 // In the case of older JDKs which do not use the discovered |
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176 // field for the pending list, an inactive ref (next != NULL) |
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177 // must always have a NULL discovered field. |
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178 T next = oopDesc::load_heap_oop(next_addr); |
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179 oop discovered = java_lang_ref_Reference::discovered(obj); |
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180 assert(oopDesc::is_null(next) || oopDesc::is_null(discovered), |
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181 err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field", |
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182 (oopDesc*)obj)); |
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183 #endif |
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184 } |
0 | 185 PSParallelCompact::mark_and_push(cm, next_addr); |
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186 ref->InstanceKlass::oop_follow_contents(cm, obj); |
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187 } |
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188 |
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189 void InstanceRefKlass::oop_follow_contents(ParCompactionManager* cm, |
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190 oop obj) { |
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191 if (UseCompressedOops) { |
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192 specialized_oop_follow_contents<narrowOop>(this, cm, obj); |
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193 } else { |
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194 specialized_oop_follow_contents<oop>(this, cm, obj); |
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195 } |
0 | 196 } |
197 #endif // SERIALGC | |
198 | |
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199 #ifdef ASSERT |
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200 template <class T> void trace_reference_gc(const char *s, oop obj, |
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201 T* referent_addr, |
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202 T* next_addr, |
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203 T* discovered_addr) { |
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204 if(TraceReferenceGC && PrintGCDetails) { |
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205 gclog_or_tty->print_cr("%s obj " INTPTR_FORMAT, s, (address)obj); |
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206 gclog_or_tty->print_cr(" referent_addr/* " INTPTR_FORMAT " / " |
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207 INTPTR_FORMAT, referent_addr, |
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208 referent_addr ? |
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209 (address)oopDesc::load_decode_heap_oop(referent_addr) : NULL); |
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210 gclog_or_tty->print_cr(" next_addr/* " INTPTR_FORMAT " / " |
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211 INTPTR_FORMAT, next_addr, |
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212 next_addr ? (address)oopDesc::load_decode_heap_oop(next_addr) : NULL); |
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213 gclog_or_tty->print_cr(" discovered_addr/* " INTPTR_FORMAT " / " |
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214 INTPTR_FORMAT, discovered_addr, |
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215 discovered_addr ? |
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216 (address)oopDesc::load_decode_heap_oop(discovered_addr) : NULL); |
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217 } |
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218 } |
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219 #endif |
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220 |
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221 template <class T> void specialized_oop_adjust_pointers(InstanceRefKlass *ref, oop obj) { |
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222 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
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223 MarkSweep::adjust_pointer(referent_addr); |
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224 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
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225 MarkSweep::adjust_pointer(next_addr); |
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226 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); |
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227 MarkSweep::adjust_pointer(discovered_addr); |
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228 debug_only(trace_reference_gc("InstanceRefKlass::oop_adjust_pointers", obj, |
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229 referent_addr, next_addr, discovered_addr);) |
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230 } |
0 | 231 |
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232 int InstanceRefKlass::oop_adjust_pointers(oop obj) { |
0 | 233 int size = size_helper(); |
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234 InstanceKlass::oop_adjust_pointers(obj); |
0 | 235 |
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236 if (UseCompressedOops) { |
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237 specialized_oop_adjust_pointers<narrowOop>(this, obj); |
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238 } else { |
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239 specialized_oop_adjust_pointers<oop>(this, obj); |
0 | 240 } |
241 return size; | |
242 } | |
243 | |
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244 #define InstanceRefKlass_SPECIALIZED_OOP_ITERATE(T, nv_suffix, contains) \ |
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245 T* disc_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); \ |
342
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246 if (closure->apply_to_weak_ref_discovered_field()) { \ |
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247 closure->do_oop##nv_suffix(disc_addr); \ |
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248 } \ |
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249 \ |
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250 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); \ |
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251 T heap_oop = oopDesc::load_heap_oop(referent_addr); \ |
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252 ReferenceProcessor* rp = closure->_ref_processor; \ |
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253 if (!oopDesc::is_null(heap_oop)) { \ |
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254 oop referent = oopDesc::decode_heap_oop_not_null(heap_oop); \ |
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255 if (!referent->is_gc_marked() && (rp != NULL) && \ |
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256 rp->discover_reference(obj, reference_type())) { \ |
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257 return size; \ |
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258 } else if (contains(referent_addr)) { \ |
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259 /* treat referent as normal oop */ \ |
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260 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\ |
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261 closure->do_oop##nv_suffix(referent_addr); \ |
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262 } \ |
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263 } \ |
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264 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); \ |
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265 if (ReferenceProcessor::pending_list_uses_discovered_field()) { \ |
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266 T next_oop = oopDesc::load_heap_oop(next_addr); \ |
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267 /* Treat discovered as normal oop, if ref is not "active" (next non-NULL) */\ |
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268 if (!oopDesc::is_null(next_oop) && contains(disc_addr)) { \ |
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269 /* i.e. ref is not "active" */ \ |
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270 debug_only( \ |
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271 if(TraceReferenceGC && PrintGCDetails) { \ |
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272 gclog_or_tty->print_cr(" Process discovered as normal " \ |
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273 INTPTR_FORMAT, disc_addr); \ |
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274 } \ |
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275 ) \ |
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276 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\ |
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277 closure->do_oop##nv_suffix(disc_addr); \ |
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278 } \ |
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279 } else { \ |
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280 /* In the case of older JDKs which do not use the discovered field for */ \ |
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281 /* the pending list, an inactive ref (next != NULL) must always have a */ \ |
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282 /* NULL discovered field. */ \ |
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283 debug_only( \ |
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284 T next_oop = oopDesc::load_heap_oop(next_addr); \ |
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285 T disc_oop = oopDesc::load_heap_oop(disc_addr); \ |
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286 assert(oopDesc::is_null(next_oop) || oopDesc::is_null(disc_oop), \ |
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287 err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL" \ |
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288 "discovered field", (oopDesc*)obj)); \ |
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289 ) \ |
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290 } \ |
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291 /* treat next as normal oop */ \ |
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292 if (contains(next_addr)) { \ |
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293 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk); \ |
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294 closure->do_oop##nv_suffix(next_addr); \ |
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295 } \ |
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296 return size; \ |
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297 |
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298 |
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299 template <class T> bool contains(T *t) { return true; } |
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300 |
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301 // Macro to define InstanceRefKlass::oop_oop_iterate for virtual/nonvirtual for |
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302 // all closures. Macros calling macros above for each oop size. |
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303 |
0 | 304 #define InstanceRefKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ |
305 \ | |
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306 int InstanceRefKlass:: \ |
0 | 307 oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \ |
308 /* Get size before changing pointers */ \ | |
309 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\ | |
310 \ | |
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311 int size = InstanceKlass::oop_oop_iterate##nv_suffix(obj, closure); \ |
0 | 312 \ |
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313 if (UseCompressedOops) { \ |
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314 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, contains); \ |
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315 } else { \ |
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316 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, contains); \ |
0 | 317 } \ |
318 } | |
319 | |
342
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320 #ifndef SERIALGC |
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321 #define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \ |
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322 \ |
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323 int InstanceRefKlass:: \ |
342
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324 oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure) { \ |
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325 /* Get size before changing pointers */ \ |
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326 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\ |
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327 \ |
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328 int size = InstanceKlass::oop_oop_iterate_backwards##nv_suffix(obj, closure); \ |
342
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329 \ |
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330 if (UseCompressedOops) { \ |
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331 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, contains); \ |
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332 } else { \ |
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333 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, contains); \ |
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334 } \ |
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335 } |
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336 #endif // !SERIALGC |
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337 |
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338 |
0 | 339 #define InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \ |
340 \ | |
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341 int InstanceRefKlass:: \ |
0 | 342 oop_oop_iterate##nv_suffix##_m(oop obj, \ |
343 OopClosureType* closure, \ | |
344 MemRegion mr) { \ | |
345 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\ | |
346 \ | |
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347 int size = InstanceKlass::oop_oop_iterate##nv_suffix##_m(obj, closure, mr); \ |
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348 if (UseCompressedOops) { \ |
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349 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, mr.contains); \ |
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350 } else { \ |
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351 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, mr.contains); \ |
0 | 352 } \ |
353 } | |
354 | |
355 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN) | |
342
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356 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN) |
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357 #ifndef SERIALGC |
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358 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN) |
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359 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN) |
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360 #endif // SERIALGC |
0 | 361 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m) |
342
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362 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m) |
0 | 363 |
364 #ifndef SERIALGC | |
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365 template <class T> |
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366 void specialized_oop_push_contents(InstanceRefKlass *ref, |
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367 PSPromotionManager* pm, oop obj) { |
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368 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
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369 if (PSScavenge::should_scavenge(referent_addr)) { |
0 | 370 ReferenceProcessor* rp = PSScavenge::reference_processor(); |
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371 if (rp->discover_reference(obj, ref->reference_type())) { |
0 | 372 // reference already enqueued, referent and next will be traversed later |
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373 ref->InstanceKlass::oop_push_contents(pm, obj); |
0 | 374 return; |
375 } else { | |
376 // treat referent as normal oop | |
377 pm->claim_or_forward_depth(referent_addr); | |
378 } | |
379 } | |
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380 // Treat discovered as normal oop, if ref is not "active", |
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381 // i.e. if next is non-NULL. |
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382 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
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383 if (ReferenceProcessor::pending_list_uses_discovered_field()) { |
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384 T next_oop = oopDesc::load_heap_oop(next_addr); |
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385 if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active" |
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386 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); |
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387 debug_only( |
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388 if(TraceReferenceGC && PrintGCDetails) { |
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389 gclog_or_tty->print_cr(" Process discovered as normal " |
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390 INTPTR_FORMAT, discovered_addr); |
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391 } |
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392 ) |
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393 if (PSScavenge::should_scavenge(discovered_addr)) { |
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394 pm->claim_or_forward_depth(discovered_addr); |
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395 } |
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396 } |
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397 } else { |
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398 #ifdef ASSERT |
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399 // In the case of older JDKs which do not use the discovered |
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400 // field for the pending list, an inactive ref (next != NULL) |
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401 // must always have a NULL discovered field. |
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402 oop next = oopDesc::load_decode_heap_oop(next_addr); |
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403 oop discovered = java_lang_ref_Reference::discovered(obj); |
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404 assert(oopDesc::is_null(next) || oopDesc::is_null(discovered), |
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405 err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field", |
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406 (oopDesc*)obj)); |
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407 #endif |
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408 } |
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409 |
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410 // Treat next as normal oop; next is a link in the reference queue. |
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411 if (PSScavenge::should_scavenge(next_addr)) { |
0 | 412 pm->claim_or_forward_depth(next_addr); |
413 } | |
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414 ref->InstanceKlass::oop_push_contents(pm, obj); |
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415 } |
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416 |
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417 void InstanceRefKlass::oop_push_contents(PSPromotionManager* pm, oop obj) { |
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418 if (UseCompressedOops) { |
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419 specialized_oop_push_contents<narrowOop>(this, pm, obj); |
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420 } else { |
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421 specialized_oop_push_contents<oop>(this, pm, obj); |
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422 } |
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423 } |
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424 |
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425 template <class T> |
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426 void specialized_oop_update_pointers(InstanceRefKlass *ref, |
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427 ParCompactionManager* cm, oop obj) { |
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428 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
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429 PSParallelCompact::adjust_pointer(referent_addr); |
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430 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
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431 PSParallelCompact::adjust_pointer(next_addr); |
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432 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); |
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433 PSParallelCompact::adjust_pointer(discovered_addr); |
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434 debug_only(trace_reference_gc("InstanceRefKlass::oop_update_ptrs", obj, |
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435 referent_addr, next_addr, discovered_addr);) |
0 | 436 } |
437 | |
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438 int InstanceRefKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) { |
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439 InstanceKlass::oop_update_pointers(cm, obj); |
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440 if (UseCompressedOops) { |
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441 specialized_oop_update_pointers<narrowOop>(this, cm, obj); |
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442 } else { |
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443 specialized_oop_update_pointers<oop>(this, cm, obj); |
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444 } |
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445 return size_helper(); |
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446 } |
0 | 447 #endif // SERIALGC |
448 | |
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449 void InstanceRefKlass::update_nonstatic_oop_maps(Klass* k) { |
0 | 450 // Clear the nonstatic oop-map entries corresponding to referent |
451 // and nextPending field. They are treated specially by the | |
452 // garbage collector. | |
453 // The discovered field is used only by the garbage collector | |
454 // and is also treated specially. | |
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455 InstanceKlass* ik = InstanceKlass::cast(k); |
0 | 456 |
457 // Check that we have the right class | |
458 debug_only(static bool first_time = true); | |
1142 | 459 assert(k == SystemDictionary::Reference_klass() && first_time, |
0 | 460 "Invalid update of maps"); |
461 debug_only(first_time = false); | |
938 | 462 assert(ik->nonstatic_oop_map_count() == 1, "just checking"); |
0 | 463 |
464 OopMapBlock* map = ik->start_of_nonstatic_oop_maps(); | |
465 | |
466 // Check that the current map is (2,4) - currently points at field with | |
467 // offset 2 (words) and has 4 map entries. | |
468 debug_only(int offset = java_lang_ref_Reference::referent_offset); | |
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469 debug_only(unsigned int count = ((java_lang_ref_Reference::discovered_offset - |
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470 java_lang_ref_Reference::referent_offset)/heapOopSize) + 1); |
0 | 471 |
472 if (UseSharedSpaces) { | |
473 assert(map->offset() == java_lang_ref_Reference::queue_offset && | |
938 | 474 map->count() == 1, "just checking"); |
0 | 475 } else { |
938 | 476 assert(map->offset() == offset && map->count() == count, |
0 | 477 "just checking"); |
478 | |
479 // Update map to (3,1) - point to offset of 3 (words) with 1 map entry. | |
480 map->set_offset(java_lang_ref_Reference::queue_offset); | |
938 | 481 map->set_count(1); |
0 | 482 } |
483 } | |
484 | |
485 | |
486 // Verification | |
487 | |
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488 void InstanceRefKlass::oop_verify_on(oop obj, outputStream* st) { |
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489 InstanceKlass::oop_verify_on(obj, st); |
0 | 490 // Verify referent field |
491 oop referent = java_lang_ref_Reference::referent(obj); | |
492 | |
493 // We should make this general to all heaps | |
494 GenCollectedHeap* gch = NULL; | |
495 if (Universe::heap()->kind() == CollectedHeap::GenCollectedHeap) | |
496 gch = GenCollectedHeap::heap(); | |
497 | |
498 if (referent != NULL) { | |
499 guarantee(referent->is_oop(), "referent field heap failed"); | |
500 } | |
501 // Verify next field | |
502 oop next = java_lang_ref_Reference::next(obj); | |
503 if (next != NULL) { | |
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504 guarantee(next->is_oop(), "next field verify failed"); |
0 | 505 guarantee(next->is_instanceRef(), "next field verify failed"); |
506 } | |
507 } | |
508 | |
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509 bool InstanceRefKlass::owns_pending_list_lock(JavaThread* thread) { |
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510 if (java_lang_ref_Reference::pending_list_lock() == NULL) return false; |
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511 Handle h_lock(thread, java_lang_ref_Reference::pending_list_lock()); |
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512 return ObjectSynchronizer::current_thread_holds_lock(thread, h_lock); |
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513 } |
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514 |
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515 void InstanceRefKlass::acquire_pending_list_lock(BasicLock *pending_list_basic_lock) { |
0 | 516 // we may enter this with pending exception set |
517 PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument | |
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518 |
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519 // Create a HandleMark in case we retry a GC multiple times. |
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520 // Each time we attempt the GC, we allocate the handle below |
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521 // to hold the pending list lock. We want to free this handle. |
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522 HandleMark hm; |
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523 |
0 | 524 Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock()); |
525 ObjectSynchronizer::fast_enter(h_lock, pending_list_basic_lock, false, THREAD); | |
526 assert(ObjectSynchronizer::current_thread_holds_lock( | |
527 JavaThread::current(), h_lock), | |
528 "Locking should have succeeded"); | |
529 if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION; | |
530 } | |
531 | |
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532 void InstanceRefKlass::release_and_notify_pending_list_lock( |
0 | 533 BasicLock *pending_list_basic_lock) { |
534 // we may enter this with pending exception set | |
535 PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument | |
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536 |
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537 // Create a HandleMark in case we retry a GC multiple times. |
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538 // Each time we attempt the GC, we allocate the handle below |
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539 // to hold the pending list lock. We want to free this handle. |
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540 HandleMark hm; |
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541 |
0 | 542 Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock()); |
543 assert(ObjectSynchronizer::current_thread_holds_lock( | |
544 JavaThread::current(), h_lock), | |
545 "Lock should be held"); | |
546 // Notify waiters on pending lists lock if there is any reference. | |
547 if (java_lang_ref_Reference::pending_list() != NULL) { | |
548 ObjectSynchronizer::notifyall(h_lock, THREAD); | |
549 } | |
550 ObjectSynchronizer::fast_exit(h_lock(), pending_list_basic_lock, THREAD); | |
551 if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION; | |
552 } |