Mercurial > hg > graal-compiler
annotate src/share/vm/oops/instanceRefKlass.cpp @ 21814:5f07d936a14e
8058982: Better verification of an exceptional invokespecial
Summary: Throw VerifyError for illegal accesses
Reviewed-by: acorn, ahgross, coleenp
author | hseigel |
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date | Mon, 20 Oct 2014 15:14:56 -0400 |
parents | 78bbf4d43a14 |
children | a8ea2f110d87 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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49 |
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50 template <class T> |
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51 void specialized_oop_follow_contents(InstanceRefKlass* ref, oop obj) { |
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52 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
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53 T heap_oop = oopDesc::load_heap_oop(referent_addr); |
0 | 54 debug_only( |
55 if(TraceReferenceGC && PrintGCDetails) { | |
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56 gclog_or_tty->print_cr("InstanceRefKlass::oop_follow_contents " INTPTR_FORMAT, (void *)obj); |
0 | 57 } |
58 ) | |
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59 if (!oopDesc::is_null(heap_oop)) { |
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60 oop referent = oopDesc::decode_heap_oop_not_null(heap_oop); |
0 | 61 if (!referent->is_gc_marked() && |
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62 MarkSweep::ref_processor()->discover_reference(obj, ref->reference_type())) { |
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63 // reference was discovered, referent will be traversed later |
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64 ref->InstanceKlass::oop_follow_contents(obj); |
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65 debug_only( |
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66 if(TraceReferenceGC && PrintGCDetails) { |
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67 gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, (void *)obj); |
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68 } |
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69 ) |
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70 return; |
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71 } else { |
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72 // treat referent as normal oop |
0 | 73 debug_only( |
74 if(TraceReferenceGC && PrintGCDetails) { | |
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75 gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, (void *)obj); |
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76 } |
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77 ) |
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78 MarkSweep::mark_and_push(referent_addr); |
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79 } |
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80 } |
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81 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
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82 if (ReferenceProcessor::pending_list_uses_discovered_field()) { |
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83 // Treat discovered as normal oop, if ref is not "active", |
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84 // i.e. if next is non-NULL. |
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85 T next_oop = oopDesc::load_heap_oop(next_addr); |
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86 if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active" |
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87 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); |
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88 debug_only( |
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89 if(TraceReferenceGC && PrintGCDetails) { |
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90 gclog_or_tty->print_cr(" Process discovered as normal " |
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91 INTPTR_FORMAT, discovered_addr); |
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92 } |
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93 ) |
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94 MarkSweep::mark_and_push(discovered_addr); |
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95 } |
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96 } else { |
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97 #ifdef ASSERT |
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98 // In the case of older JDKs which do not use the discovered |
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99 // field for the pending list, an inactive ref (next != NULL) |
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100 // must always have a NULL discovered field. |
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101 oop next = oopDesc::load_decode_heap_oop(next_addr); |
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102 oop discovered = java_lang_ref_Reference::discovered(obj); |
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103 assert(oopDesc::is_null(next) || oopDesc::is_null(discovered), |
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104 err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field", |
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105 (oopDesc*)obj)); |
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106 #endif |
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107 } |
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108 // treat next as normal oop. next is a link in the reference queue. |
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109 debug_only( |
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110 if(TraceReferenceGC && PrintGCDetails) { |
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111 gclog_or_tty->print_cr(" Process next as normal " INTPTR_FORMAT, next_addr); |
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112 } |
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113 ) |
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114 MarkSweep::mark_and_push(next_addr); |
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115 ref->InstanceKlass::oop_follow_contents(obj); |
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116 } |
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117 |
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118 void InstanceRefKlass::oop_follow_contents(oop obj) { |
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119 if (UseCompressedOops) { |
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120 specialized_oop_follow_contents<narrowOop>(this, obj); |
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121 } else { |
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122 specialized_oop_follow_contents<oop>(this, obj); |
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123 } |
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124 } |
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125 |
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126 #if INCLUDE_ALL_GCS |
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127 template <class T> |
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128 void specialized_oop_follow_contents(InstanceRefKlass* ref, |
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129 ParCompactionManager* cm, |
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130 oop obj) { |
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131 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
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132 T heap_oop = oopDesc::load_heap_oop(referent_addr); |
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133 debug_only( |
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134 if(TraceReferenceGC && PrintGCDetails) { |
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135 gclog_or_tty->print_cr("InstanceRefKlass::oop_follow_contents " INTPTR_FORMAT, (void *)obj); |
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136 } |
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137 ) |
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138 if (!oopDesc::is_null(heap_oop)) { |
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139 oop referent = oopDesc::decode_heap_oop_not_null(heap_oop); |
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140 if (PSParallelCompact::mark_bitmap()->is_unmarked(referent) && |
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141 PSParallelCompact::ref_processor()-> |
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142 discover_reference(obj, ref->reference_type())) { |
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143 // reference already enqueued, referent will be traversed later |
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144 ref->InstanceKlass::oop_follow_contents(cm, obj); |
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145 debug_only( |
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146 if(TraceReferenceGC && PrintGCDetails) { |
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147 gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, (void *)obj); |
0 | 148 } |
149 ) | |
150 return; | |
151 } else { | |
152 // treat referent as normal oop | |
153 debug_only( | |
154 if(TraceReferenceGC && PrintGCDetails) { | |
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155 gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, (void *)obj); |
0 | 156 } |
157 ) | |
158 PSParallelCompact::mark_and_push(cm, referent_addr); | |
159 } | |
160 } | |
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161 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
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162 if (ReferenceProcessor::pending_list_uses_discovered_field()) { |
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163 // Treat discovered as normal oop, if ref is not "active", |
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164 // i.e. if next is non-NULL. |
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165 T next_oop = oopDesc::load_heap_oop(next_addr); |
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166 if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active" |
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167 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); |
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168 debug_only( |
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169 if(TraceReferenceGC && PrintGCDetails) { |
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170 gclog_or_tty->print_cr(" Process discovered as normal " |
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171 INTPTR_FORMAT, discovered_addr); |
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172 } |
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173 ) |
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174 PSParallelCompact::mark_and_push(cm, discovered_addr); |
0 | 175 } |
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176 } else { |
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177 #ifdef ASSERT |
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178 // In the case of older JDKs which do not use the discovered |
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179 // field for the pending list, an inactive ref (next != NULL) |
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180 // must always have a NULL discovered field. |
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181 T next = oopDesc::load_heap_oop(next_addr); |
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182 oop discovered = java_lang_ref_Reference::discovered(obj); |
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183 assert(oopDesc::is_null(next) || oopDesc::is_null(discovered), |
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184 err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field", |
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185 (oopDesc*)obj)); |
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186 #endif |
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187 } |
0 | 188 PSParallelCompact::mark_and_push(cm, next_addr); |
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189 ref->InstanceKlass::oop_follow_contents(cm, obj); |
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190 } |
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191 |
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192 void InstanceRefKlass::oop_follow_contents(ParCompactionManager* cm, |
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193 oop obj) { |
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194 if (UseCompressedOops) { |
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195 specialized_oop_follow_contents<narrowOop>(this, cm, obj); |
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196 } else { |
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197 specialized_oop_follow_contents<oop>(this, cm, obj); |
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198 } |
0 | 199 } |
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200 #endif // INCLUDE_ALL_GCS |
0 | 201 |
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202 #ifdef ASSERT |
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203 template <class T> void trace_reference_gc(const char *s, oop obj, |
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204 T* referent_addr, |
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205 T* next_addr, |
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206 T* discovered_addr) { |
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207 if(TraceReferenceGC && PrintGCDetails) { |
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208 gclog_or_tty->print_cr("%s obj " INTPTR_FORMAT, s, (address)obj); |
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209 gclog_or_tty->print_cr(" referent_addr/* " INTPTR_FORMAT " / " |
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210 INTPTR_FORMAT, referent_addr, |
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211 referent_addr ? |
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212 (address)oopDesc::load_decode_heap_oop(referent_addr) : NULL); |
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213 gclog_or_tty->print_cr(" next_addr/* " INTPTR_FORMAT " / " |
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214 INTPTR_FORMAT, next_addr, |
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215 next_addr ? (address)oopDesc::load_decode_heap_oop(next_addr) : NULL); |
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216 gclog_or_tty->print_cr(" discovered_addr/* " INTPTR_FORMAT " / " |
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217 INTPTR_FORMAT, discovered_addr, |
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218 discovered_addr ? |
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219 (address)oopDesc::load_decode_heap_oop(discovered_addr) : NULL); |
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220 } |
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221 } |
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222 #endif |
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223 |
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224 template <class T> void specialized_oop_adjust_pointers(InstanceRefKlass *ref, oop obj) { |
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225 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
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226 MarkSweep::adjust_pointer(referent_addr); |
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227 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
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228 MarkSweep::adjust_pointer(next_addr); |
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229 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); |
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230 MarkSweep::adjust_pointer(discovered_addr); |
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231 debug_only(trace_reference_gc("InstanceRefKlass::oop_adjust_pointers", obj, |
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232 referent_addr, next_addr, discovered_addr);) |
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233 } |
0 | 234 |
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235 int InstanceRefKlass::oop_adjust_pointers(oop obj) { |
0 | 236 int size = size_helper(); |
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237 InstanceKlass::oop_adjust_pointers(obj); |
0 | 238 |
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239 if (UseCompressedOops) { |
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240 specialized_oop_adjust_pointers<narrowOop>(this, obj); |
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241 } else { |
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242 specialized_oop_adjust_pointers<oop>(this, obj); |
0 | 243 } |
244 return size; | |
245 } | |
246 | |
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247 #define InstanceRefKlass_SPECIALIZED_OOP_ITERATE(T, nv_suffix, contains) \ |
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248 T* disc_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); \ |
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249 if (closure->apply_to_weak_ref_discovered_field()) { \ |
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250 closure->do_oop##nv_suffix(disc_addr); \ |
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251 } \ |
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252 \ |
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253 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); \ |
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254 T heap_oop = oopDesc::load_heap_oop(referent_addr); \ |
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255 ReferenceProcessor* rp = closure->_ref_processor; \ |
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256 if (!oopDesc::is_null(heap_oop)) { \ |
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257 oop referent = oopDesc::decode_heap_oop_not_null(heap_oop); \ |
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258 if (!referent->is_gc_marked() && (rp != NULL) && \ |
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259 rp->discover_reference(obj, reference_type())) { \ |
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260 return size; \ |
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261 } else if (contains(referent_addr)) { \ |
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262 /* treat referent as normal oop */ \ |
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263 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\ |
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264 closure->do_oop##nv_suffix(referent_addr); \ |
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265 } \ |
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266 } \ |
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267 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); \ |
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268 if (ReferenceProcessor::pending_list_uses_discovered_field()) { \ |
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269 T next_oop = oopDesc::load_heap_oop(next_addr); \ |
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270 /* Treat discovered as normal oop, if ref is not "active" (next non-NULL) */\ |
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271 if (!oopDesc::is_null(next_oop) && contains(disc_addr)) { \ |
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272 /* i.e. ref is not "active" */ \ |
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273 debug_only( \ |
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274 if(TraceReferenceGC && PrintGCDetails) { \ |
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275 gclog_or_tty->print_cr(" Process discovered as normal " \ |
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276 INTPTR_FORMAT, disc_addr); \ |
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277 } \ |
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278 ) \ |
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279 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\ |
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280 closure->do_oop##nv_suffix(disc_addr); \ |
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281 } \ |
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282 } else { \ |
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283 /* In the case of older JDKs which do not use the discovered field for */ \ |
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284 /* the pending list, an inactive ref (next != NULL) must always have a */ \ |
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285 /* NULL discovered field. */ \ |
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286 debug_only( \ |
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287 T next_oop = oopDesc::load_heap_oop(next_addr); \ |
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288 T disc_oop = oopDesc::load_heap_oop(disc_addr); \ |
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289 assert(oopDesc::is_null(next_oop) || oopDesc::is_null(disc_oop), \ |
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290 err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL" \ |
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291 "discovered field", (oopDesc*)obj)); \ |
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292 ) \ |
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293 } \ |
113
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294 /* treat next as normal oop */ \ |
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295 if (contains(next_addr)) { \ |
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296 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk); \ |
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297 closure->do_oop##nv_suffix(next_addr); \ |
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298 } \ |
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299 return size; \ |
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300 |
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301 |
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302 template <class T> bool contains(T *t) { return true; } |
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303 |
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304 // Macro to define InstanceRefKlass::oop_oop_iterate for virtual/nonvirtual for |
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305 // all closures. Macros calling macros above for each oop size. |
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306 |
0 | 307 #define InstanceRefKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \ |
308 \ | |
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309 int InstanceRefKlass:: \ |
0 | 310 oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \ |
311 /* Get size before changing pointers */ \ | |
312 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\ | |
313 \ | |
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314 int size = InstanceKlass::oop_oop_iterate##nv_suffix(obj, closure); \ |
0 | 315 \ |
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316 if (UseCompressedOops) { \ |
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317 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, contains); \ |
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318 } else { \ |
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319 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, contains); \ |
0 | 320 } \ |
321 } | |
322 | |
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323 #if INCLUDE_ALL_GCS |
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324 #define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \ |
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325 \ |
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326 int InstanceRefKlass:: \ |
342
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327 oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure) { \ |
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328 /* Get size before changing pointers */ \ |
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329 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\ |
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330 \ |
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331 int size = InstanceKlass::oop_oop_iterate_backwards##nv_suffix(obj, closure); \ |
342
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332 \ |
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333 if (UseCompressedOops) { \ |
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334 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, contains); \ |
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335 } else { \ |
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336 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, contains); \ |
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337 } \ |
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338 } |
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339 #endif // INCLUDE_ALL_GCS |
342
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340 |
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341 |
0 | 342 #define InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \ |
343 \ | |
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344 int InstanceRefKlass:: \ |
0 | 345 oop_oop_iterate##nv_suffix##_m(oop obj, \ |
346 OopClosureType* closure, \ | |
347 MemRegion mr) { \ | |
348 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\ | |
349 \ | |
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350 int size = InstanceKlass::oop_oop_iterate##nv_suffix##_m(obj, closure, mr); \ |
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351 if (UseCompressedOops) { \ |
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352 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, mr.contains); \ |
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353 } else { \ |
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354 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, mr.contains); \ |
0 | 355 } \ |
356 } | |
357 | |
358 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN) | |
342
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359 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN) |
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360 #if INCLUDE_ALL_GCS |
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361 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN) |
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362 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN) |
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363 #endif // INCLUDE_ALL_GCS |
0 | 364 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m) |
342
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365 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m) |
0 | 366 |
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367 #if INCLUDE_ALL_GCS |
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368 template <class T> |
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369 void specialized_oop_push_contents(InstanceRefKlass *ref, |
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370 PSPromotionManager* pm, oop obj) { |
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371 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
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372 if (PSScavenge::should_scavenge(referent_addr)) { |
0 | 373 ReferenceProcessor* rp = PSScavenge::reference_processor(); |
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374 if (rp->discover_reference(obj, ref->reference_type())) { |
0 | 375 // reference already enqueued, referent and next will be traversed later |
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376 ref->InstanceKlass::oop_push_contents(pm, obj); |
0 | 377 return; |
378 } else { | |
379 // treat referent as normal oop | |
380 pm->claim_or_forward_depth(referent_addr); | |
381 } | |
382 } | |
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383 // Treat discovered as normal oop, if ref is not "active", |
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384 // i.e. if next is non-NULL. |
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385 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
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386 if (ReferenceProcessor::pending_list_uses_discovered_field()) { |
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387 T next_oop = oopDesc::load_heap_oop(next_addr); |
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388 if (!oopDesc::is_null(next_oop)) { // i.e. ref is not "active" |
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389 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); |
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390 debug_only( |
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391 if(TraceReferenceGC && PrintGCDetails) { |
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392 gclog_or_tty->print_cr(" Process discovered as normal " |
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393 INTPTR_FORMAT, discovered_addr); |
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394 } |
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395 ) |
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396 if (PSScavenge::should_scavenge(discovered_addr)) { |
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397 pm->claim_or_forward_depth(discovered_addr); |
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398 } |
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399 } |
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400 } else { |
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401 #ifdef ASSERT |
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402 // In the case of older JDKs which do not use the discovered |
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403 // field for the pending list, an inactive ref (next != NULL) |
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404 // must always have a NULL discovered field. |
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405 oop next = oopDesc::load_decode_heap_oop(next_addr); |
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406 oop discovered = java_lang_ref_Reference::discovered(obj); |
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407 assert(oopDesc::is_null(next) || oopDesc::is_null(discovered), |
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408 err_msg("Found an inactive reference " PTR_FORMAT " with a non-NULL discovered field", |
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409 (oopDesc*)obj)); |
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410 #endif |
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411 } |
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412 |
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413 // Treat next as normal oop; next is a link in the reference queue. |
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414 if (PSScavenge::should_scavenge(next_addr)) { |
0 | 415 pm->claim_or_forward_depth(next_addr); |
416 } | |
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417 ref->InstanceKlass::oop_push_contents(pm, obj); |
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418 } |
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419 |
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420 void InstanceRefKlass::oop_push_contents(PSPromotionManager* pm, oop obj) { |
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421 if (UseCompressedOops) { |
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422 specialized_oop_push_contents<narrowOop>(this, pm, obj); |
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423 } else { |
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424 specialized_oop_push_contents<oop>(this, pm, obj); |
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425 } |
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426 } |
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427 |
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428 template <class T> |
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429 void specialized_oop_update_pointers(InstanceRefKlass *ref, |
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430 ParCompactionManager* cm, oop obj) { |
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431 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); |
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432 PSParallelCompact::adjust_pointer(referent_addr); |
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433 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); |
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434 PSParallelCompact::adjust_pointer(next_addr); |
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435 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); |
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436 PSParallelCompact::adjust_pointer(discovered_addr); |
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437 debug_only(trace_reference_gc("InstanceRefKlass::oop_update_ptrs", obj, |
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438 referent_addr, next_addr, discovered_addr);) |
0 | 439 } |
440 | |
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441 int InstanceRefKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) { |
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442 InstanceKlass::oop_update_pointers(cm, obj); |
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443 if (UseCompressedOops) { |
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444 specialized_oop_update_pointers<narrowOop>(this, cm, obj); |
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445 } else { |
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446 specialized_oop_update_pointers<oop>(this, cm, obj); |
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447 } |
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448 return size_helper(); |
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449 } |
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450 #endif // INCLUDE_ALL_GCS |
0 | 451 |
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452 void InstanceRefKlass::update_nonstatic_oop_maps(Klass* k) { |
0 | 453 // Clear the nonstatic oop-map entries corresponding to referent |
454 // and nextPending field. They are treated specially by the | |
455 // garbage collector. | |
456 // The discovered field is used only by the garbage collector | |
457 // and is also treated specially. | |
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458 InstanceKlass* ik = InstanceKlass::cast(k); |
0 | 459 |
460 // Check that we have the right class | |
461 debug_only(static bool first_time = true); | |
1142 | 462 assert(k == SystemDictionary::Reference_klass() && first_time, |
0 | 463 "Invalid update of maps"); |
464 debug_only(first_time = false); | |
938 | 465 assert(ik->nonstatic_oop_map_count() == 1, "just checking"); |
0 | 466 |
467 OopMapBlock* map = ik->start_of_nonstatic_oop_maps(); | |
468 | |
469 // Check that the current map is (2,4) - currently points at field with | |
470 // offset 2 (words) and has 4 map entries. | |
471 debug_only(int offset = java_lang_ref_Reference::referent_offset); | |
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472 debug_only(unsigned int count = ((java_lang_ref_Reference::discovered_offset - |
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473 java_lang_ref_Reference::referent_offset)/heapOopSize) + 1); |
0 | 474 |
475 if (UseSharedSpaces) { | |
476 assert(map->offset() == java_lang_ref_Reference::queue_offset && | |
938 | 477 map->count() == 1, "just checking"); |
0 | 478 } else { |
938 | 479 assert(map->offset() == offset && map->count() == count, |
0 | 480 "just checking"); |
481 | |
482 // Update map to (3,1) - point to offset of 3 (words) with 1 map entry. | |
483 map->set_offset(java_lang_ref_Reference::queue_offset); | |
938 | 484 map->set_count(1); |
0 | 485 } |
486 } | |
487 | |
488 | |
489 // Verification | |
490 | |
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491 void InstanceRefKlass::oop_verify_on(oop obj, outputStream* st) { |
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492 InstanceKlass::oop_verify_on(obj, st); |
0 | 493 // Verify referent field |
494 oop referent = java_lang_ref_Reference::referent(obj); | |
495 | |
496 // We should make this general to all heaps | |
497 GenCollectedHeap* gch = NULL; | |
498 if (Universe::heap()->kind() == CollectedHeap::GenCollectedHeap) | |
499 gch = GenCollectedHeap::heap(); | |
500 | |
501 if (referent != NULL) { | |
502 guarantee(referent->is_oop(), "referent field heap failed"); | |
503 } | |
504 // Verify next field | |
505 oop next = java_lang_ref_Reference::next(obj); | |
506 if (next != NULL) { | |
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507 guarantee(next->is_oop(), "next field verify failed"); |
0 | 508 guarantee(next->is_instanceRef(), "next field verify failed"); |
509 } | |
510 } | |
511 | |
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512 bool InstanceRefKlass::owns_pending_list_lock(JavaThread* thread) { |
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513 if (java_lang_ref_Reference::pending_list_lock() == NULL) return false; |
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514 Handle h_lock(thread, java_lang_ref_Reference::pending_list_lock()); |
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515 return ObjectSynchronizer::current_thread_holds_lock(thread, h_lock); |
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516 } |
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517 |
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518 void InstanceRefKlass::acquire_pending_list_lock(BasicLock *pending_list_basic_lock) { |
0 | 519 // we may enter this with pending exception set |
520 PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument | |
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521 |
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522 // Create a HandleMark in case we retry a GC multiple times. |
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523 // Each time we attempt the GC, we allocate the handle below |
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524 // to hold the pending list lock. We want to free this handle. |
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525 HandleMark hm; |
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526 |
0 | 527 Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock()); |
528 ObjectSynchronizer::fast_enter(h_lock, pending_list_basic_lock, false, THREAD); | |
529 assert(ObjectSynchronizer::current_thread_holds_lock( | |
530 JavaThread::current(), h_lock), | |
531 "Locking should have succeeded"); | |
532 if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION; | |
533 } | |
534 | |
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535 void InstanceRefKlass::release_and_notify_pending_list_lock( |
0 | 536 BasicLock *pending_list_basic_lock) { |
537 // we may enter this with pending exception set | |
538 PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument | |
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539 |
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540 // Create a HandleMark in case we retry a GC multiple times. |
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541 // Each time we attempt the GC, we allocate the handle below |
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542 // to hold the pending list lock. We want to free this handle. |
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543 HandleMark hm; |
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544 |
0 | 545 Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock()); |
546 assert(ObjectSynchronizer::current_thread_holds_lock( | |
547 JavaThread::current(), h_lock), | |
548 "Lock should be held"); | |
549 // Notify waiters on pending lists lock if there is any reference. | |
550 if (java_lang_ref_Reference::pending_list() != NULL) { | |
551 ObjectSynchronizer::notifyall(h_lock, THREAD); | |
552 } | |
553 ObjectSynchronizer::fast_exit(h_lock(), pending_list_basic_lock, THREAD); | |
554 if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION; | |
555 } |