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annotate src/share/vm/oops/instanceRefKlass.cpp @ 939:9eebd3ac74cf

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6845368: large objects cause a crash or unexpected exception Reviewed-by: jmasa, iveresov
author jcoomes
date Thu, 13 Aug 2009 16:22:45 -0700
parents b37c246bf7ce
children 89e0543e1737
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1 /*
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2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_instanceRefKlass.cpp.incl"
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27
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28 template <class T>
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29 static void specialized_oop_follow_contents(instanceRefKlass* ref, oop obj) {
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30 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
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31 T heap_oop = oopDesc::load_heap_oop(referent_addr);
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32 debug_only(
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33 if(TraceReferenceGC && PrintGCDetails) {
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34 gclog_or_tty->print_cr("instanceRefKlass::oop_follow_contents " INTPTR_FORMAT, obj);
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35 }
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36 )
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37 if (!oopDesc::is_null(heap_oop)) {
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38 oop referent = oopDesc::decode_heap_oop_not_null(heap_oop);
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39 if (!referent->is_gc_marked() &&
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40 MarkSweep::ref_processor()->
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41 discover_reference(obj, ref->reference_type())) {
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42 // reference already enqueued, referent will be traversed later
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43 ref->instanceKlass::oop_follow_contents(obj);
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44 debug_only(
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45 if(TraceReferenceGC && PrintGCDetails) {
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46 gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, obj);
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47 }
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48 )
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49 return;
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50 } else {
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51 // treat referent as normal oop
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52 debug_only(
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53 if(TraceReferenceGC && PrintGCDetails) {
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54 gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, obj);
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55 }
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56 )
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57 MarkSweep::mark_and_push(referent_addr);
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58 }
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59 }
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60 // treat next as normal oop. next is a link in the pending list.
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61 T* next_addr = (T*)java_lang_ref_Reference::next_addr(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(" Process next as normal " INTPTR_FORMAT, next_addr);
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65 }
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66 )
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67 MarkSweep::mark_and_push(next_addr);
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68 ref->instanceKlass::oop_follow_contents(obj);
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69 }
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70
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71 void instanceRefKlass::oop_follow_contents(oop obj) {
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72 if (UseCompressedOops) {
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73 specialized_oop_follow_contents<narrowOop>(this, obj);
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74 } else {
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75 specialized_oop_follow_contents<oop>(this, obj);
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76 }
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77 }
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78
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79 #ifndef SERIALGC
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80 template <class T>
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81 static void specialized_oop_follow_contents(instanceRefKlass* ref,
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82 ParCompactionManager* cm,
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83 oop obj) {
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84 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
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85 T heap_oop = oopDesc::load_heap_oop(referent_addr);
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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("instanceRefKlass::oop_follow_contents " INTPTR_FORMAT, obj);
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89 }
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90 )
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91 if (!oopDesc::is_null(heap_oop)) {
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92 oop referent = oopDesc::decode_heap_oop_not_null(heap_oop);
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93 if (PSParallelCompact::mark_bitmap()->is_unmarked(referent) &&
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94 PSParallelCompact::ref_processor()->
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95 discover_reference(obj, ref->reference_type())) {
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96 // reference already enqueued, referent will be traversed later
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97 ref->instanceKlass::oop_follow_contents(cm, obj);
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98 debug_only(
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99 if(TraceReferenceGC && PrintGCDetails) {
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100 gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, obj);
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101 }
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102 )
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103 return;
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104 } else {
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105 // treat referent as normal oop
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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(" Non NULL normal " INTPTR_FORMAT, obj);
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109 }
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110 )
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111 PSParallelCompact::mark_and_push(cm, referent_addr);
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112 }
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113 }
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114 // treat next as normal oop. next is a link in the pending list.
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115 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
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116 debug_only(
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117 if(TraceReferenceGC && PrintGCDetails) {
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118 gclog_or_tty->print_cr(" Process next as normal " INTPTR_FORMAT, next_addr);
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119 }
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120 )
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121 PSParallelCompact::mark_and_push(cm, next_addr);
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122 ref->instanceKlass::oop_follow_contents(cm, obj);
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123 }
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124
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125 void instanceRefKlass::oop_follow_contents(ParCompactionManager* cm,
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126 oop obj) {
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127 if (UseCompressedOops) {
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128 specialized_oop_follow_contents<narrowOop>(this, cm, obj);
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129 } else {
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130 specialized_oop_follow_contents<oop>(this, cm, obj);
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131 }
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132 }
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133 #endif // SERIALGC
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134
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135 #ifdef ASSERT
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136 template <class T> void trace_reference_gc(const char *s, oop obj,
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137 T* referent_addr,
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138 T* next_addr,
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139 T* discovered_addr) {
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140 if(TraceReferenceGC && PrintGCDetails) {
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141 gclog_or_tty->print_cr("%s obj " INTPTR_FORMAT, s, (address)obj);
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142 gclog_or_tty->print_cr(" referent_addr/* " INTPTR_FORMAT " / "
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143 INTPTR_FORMAT, referent_addr,
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144 referent_addr ?
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145 (address)oopDesc::load_decode_heap_oop(referent_addr) : NULL);
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146 gclog_or_tty->print_cr(" next_addr/* " INTPTR_FORMAT " / "
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147 INTPTR_FORMAT, next_addr,
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148 next_addr ? (address)oopDesc::load_decode_heap_oop(next_addr) : NULL);
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149 gclog_or_tty->print_cr(" discovered_addr/* " INTPTR_FORMAT " / "
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150 INTPTR_FORMAT, discovered_addr,
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151 discovered_addr ?
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152 (address)oopDesc::load_decode_heap_oop(discovered_addr) : NULL);
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153 }
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154 }
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155 #endif
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156
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157 template <class T> void specialized_oop_adjust_pointers(instanceRefKlass *ref, oop obj) {
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158 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
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159 MarkSweep::adjust_pointer(referent_addr);
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160 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
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161 MarkSweep::adjust_pointer(next_addr);
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162 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
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163 MarkSweep::adjust_pointer(discovered_addr);
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164 debug_only(trace_reference_gc("instanceRefKlass::oop_adjust_pointers", obj,
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165 referent_addr, next_addr, discovered_addr);)
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166 }
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167
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168 int instanceRefKlass::oop_adjust_pointers(oop obj) {
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169 int size = size_helper();
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170 instanceKlass::oop_adjust_pointers(obj);
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171
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172 if (UseCompressedOops) {
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173 specialized_oop_adjust_pointers<narrowOop>(this, obj);
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174 } else {
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175 specialized_oop_adjust_pointers<oop>(this, obj);
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176 }
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177 return size;
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178 }
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179
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180 #define InstanceRefKlass_SPECIALIZED_OOP_ITERATE(T, nv_suffix, contains) \
342
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181 if (closure->apply_to_weak_ref_discovered_field()) { \
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182 T* disc_addr = (T*)java_lang_ref_Reference::discovered_addr(obj); \
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183 closure->do_oop##nv_suffix(disc_addr); \
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184 } \
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185 \
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186 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); \
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187 T heap_oop = oopDesc::load_heap_oop(referent_addr); \
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188 if (!oopDesc::is_null(heap_oop) && contains(referent_addr)) { \
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189 ReferenceProcessor* rp = closure->_ref_processor; \
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190 oop referent = oopDesc::decode_heap_oop_not_null(heap_oop); \
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191 if (!referent->is_gc_marked() && (rp != NULL) && \
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192 rp->discover_reference(obj, reference_type())) { \
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193 return size; \
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194 } else { \
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195 /* treat referent as normal oop */ \
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196 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\
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197 closure->do_oop##nv_suffix(referent_addr); \
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198 } \
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199 } \
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200 /* treat next as normal oop */ \
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201 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj); \
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202 if (contains(next_addr)) { \
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203 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk); \
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204 closure->do_oop##nv_suffix(next_addr); \
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205 } \
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206 return size; \
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207
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208
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209 template <class T> bool contains(T *t) { return true; }
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210
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211 // Macro to define instanceRefKlass::oop_oop_iterate for virtual/nonvirtual for
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212 // all closures. Macros calling macros above for each oop size.
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213
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214 #define InstanceRefKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \
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215 \
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216 int instanceRefKlass:: \
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217 oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \
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218 /* Get size before changing pointers */ \
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219 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
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220 \
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221 int size = instanceKlass::oop_oop_iterate##nv_suffix(obj, closure); \
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222 \
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223 if (UseCompressedOops) { \
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224 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, contains); \
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225 } else { \
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226 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, contains); \
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227 } \
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228 }
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229
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230 #ifndef SERIALGC
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231 #define InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN(OopClosureType, nv_suffix) \
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232 \
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233 int instanceRefKlass:: \
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234 oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* closure) { \
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235 /* Get size before changing pointers */ \
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236 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
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237 \
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238 int size = instanceKlass::oop_oop_iterate_backwards##nv_suffix(obj, closure); \
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239 \
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240 if (UseCompressedOops) { \
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241 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, contains); \
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242 } else { \
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243 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, contains); \
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244 } \
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245 }
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246 #endif // !SERIALGC
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247
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248
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249 #define InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \
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250 \
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251 int instanceRefKlass:: \
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252 oop_oop_iterate##nv_suffix##_m(oop obj, \
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253 OopClosureType* closure, \
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254 MemRegion mr) { \
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255 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
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256 \
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257 int size = instanceKlass::oop_oop_iterate##nv_suffix##_m(obj, closure, mr); \
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258 if (UseCompressedOops) { \
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259 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(narrowOop, nv_suffix, mr.contains); \
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260 } else { \
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261 InstanceRefKlass_SPECIALIZED_OOP_ITERATE(oop, nv_suffix, mr.contains); \
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262 } \
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263 }
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264
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265 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN)
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266 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN)
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267 #ifndef SERIALGC
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268 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
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269 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_BACKWARDS_DEFN)
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270 #endif // SERIALGC
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271 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m)
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272 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m)
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273
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274 #ifndef SERIALGC
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275 template <class T>
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276 void specialized_oop_copy_contents(instanceRefKlass *ref,
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277 PSPromotionManager* pm, oop obj) {
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278 assert(!pm->depth_first(), "invariant");
113
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279 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
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280 if (PSScavenge::should_scavenge(referent_addr)) {
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281 ReferenceProcessor* rp = PSScavenge::reference_processor();
113
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282 if (rp->discover_reference(obj, ref->reference_type())) {
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283 // reference already enqueued, referent and next will be traversed later
113
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284 ref->instanceKlass::oop_copy_contents(pm, obj);
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285 return;
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286 } else {
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287 // treat referent as normal oop
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288 pm->claim_or_forward_breadth(referent_addr);
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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 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
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293 if (PSScavenge::should_scavenge(next_addr)) {
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294 pm->claim_or_forward_breadth(next_addr);
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295 }
113
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296 ref->instanceKlass::oop_copy_contents(pm, obj);
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297 }
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298
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299 void instanceRefKlass::oop_copy_contents(PSPromotionManager* pm, oop obj) {
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300 if (UseCompressedOops) {
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301 specialized_oop_copy_contents<narrowOop>(this, pm, obj);
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302 } else {
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303 specialized_oop_copy_contents<oop>(this, pm, obj);
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304 }
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305 }
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306
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307 template <class T>
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308 void specialized_oop_push_contents(instanceRefKlass *ref,
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309 PSPromotionManager* pm, oop obj) {
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310 assert(pm->depth_first(), "invariant");
113
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311 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
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312 if (PSScavenge::should_scavenge(referent_addr)) {
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313 ReferenceProcessor* rp = PSScavenge::reference_processor();
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314 if (rp->discover_reference(obj, ref->reference_type())) {
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315 // reference already enqueued, referent and next will be traversed later
113
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316 ref->instanceKlass::oop_push_contents(pm, obj);
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317 return;
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318 } else {
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319 // treat referent as normal oop
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320 pm->claim_or_forward_depth(referent_addr);
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321 }
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322 }
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323 // treat next as normal oop
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324 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
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325 if (PSScavenge::should_scavenge(next_addr)) {
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326 pm->claim_or_forward_depth(next_addr);
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327 }
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328 ref->instanceKlass::oop_push_contents(pm, obj);
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329 }
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330
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331 void instanceRefKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
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332 if (UseCompressedOops) {
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333 specialized_oop_push_contents<narrowOop>(this, pm, obj);
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334 } else {
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335 specialized_oop_push_contents<oop>(this, pm, obj);
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336 }
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337 }
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338
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339 template <class T>
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340 void specialized_oop_update_pointers(instanceRefKlass *ref,
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341 ParCompactionManager* cm, oop obj) {
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342 T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
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343 PSParallelCompact::adjust_pointer(referent_addr);
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344 T* next_addr = (T*)java_lang_ref_Reference::next_addr(obj);
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345 PSParallelCompact::adjust_pointer(next_addr);
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346 T* discovered_addr = (T*)java_lang_ref_Reference::discovered_addr(obj);
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347 PSParallelCompact::adjust_pointer(discovered_addr);
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348 debug_only(trace_reference_gc("instanceRefKlass::oop_update_ptrs", obj,
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349 referent_addr, next_addr, discovered_addr);)
0
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350 }
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351
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352 int instanceRefKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
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353 instanceKlass::oop_update_pointers(cm, obj);
113
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354 if (UseCompressedOops) {
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355 specialized_oop_update_pointers<narrowOop>(this, cm, obj);
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356 } else {
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357 specialized_oop_update_pointers<oop>(this, cm, obj);
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358 }
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359 return size_helper();
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360 }
0
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361
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362
113
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363 template <class T> void
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364 specialized_oop_update_pointers(ParCompactionManager* cm, oop obj,
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365 HeapWord* beg_addr, HeapWord* end_addr) {
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366 T* p;
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367 T* referent_addr = p = (T*)java_lang_ref_Reference::referent_addr(obj);
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368 PSParallelCompact::adjust_pointer(p, beg_addr, end_addr);
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369 T* next_addr = p = (T*)java_lang_ref_Reference::next_addr(obj);
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370 PSParallelCompact::adjust_pointer(p, beg_addr, end_addr);
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371 T* discovered_addr = p = (T*)java_lang_ref_Reference::discovered_addr(obj);
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372 PSParallelCompact::adjust_pointer(p, beg_addr, end_addr);
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373 debug_only(trace_reference_gc("instanceRefKlass::oop_update_ptrs", obj,
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374 referent_addr, next_addr, discovered_addr);)
0
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375 }
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376
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377 int
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378 instanceRefKlass::oop_update_pointers(ParCompactionManager* cm, oop obj,
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379 HeapWord* beg_addr, HeapWord* end_addr) {
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380 instanceKlass::oop_update_pointers(cm, obj, beg_addr, end_addr);
113
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381 if (UseCompressedOops) {
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382 specialized_oop_update_pointers<narrowOop>(cm, obj, beg_addr, end_addr);
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383 } else {
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384 specialized_oop_update_pointers<oop>(cm, obj, beg_addr, end_addr);
0
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385 }
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386 return size_helper();
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387 }
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388 #endif // SERIALGC
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389
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390 void instanceRefKlass::update_nonstatic_oop_maps(klassOop k) {
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391 // Clear the nonstatic oop-map entries corresponding to referent
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392 // and nextPending field. They are treated specially by the
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393 // garbage collector.
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394 // The discovered field is used only by the garbage collector
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395 // and is also treated specially.
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396 instanceKlass* ik = instanceKlass::cast(k);
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397
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398 // Check that we have the right class
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399 debug_only(static bool first_time = true);
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400 assert(k == SystemDictionary::reference_klass() && first_time,
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401 "Invalid update of maps");
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402 debug_only(first_time = false);
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403 assert(ik->nonstatic_oop_map_count() == 1, "just checking");
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404
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405 OopMapBlock* map = ik->start_of_nonstatic_oop_maps();
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406
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407 // Check that the current map is (2,4) - currently points at field with
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408 // offset 2 (words) and has 4 map entries.
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409 debug_only(int offset = java_lang_ref_Reference::referent_offset);
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410 debug_only(unsigned int count = ((java_lang_ref_Reference::discovered_offset -
113
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411 java_lang_ref_Reference::referent_offset)/heapOopSize) + 1);
0
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412
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413 if (UseSharedSpaces) {
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414 assert(map->offset() == java_lang_ref_Reference::queue_offset &&
938
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415 map->count() == 1, "just checking");
0
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416 } else {
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417 assert(map->offset() == offset && map->count() == count,
0
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418 "just checking");
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419
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420 // Update map to (3,1) - point to offset of 3 (words) with 1 map entry.
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421 map->set_offset(java_lang_ref_Reference::queue_offset);
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422 map->set_count(1);
0
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423 }
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424 }
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425
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426
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427 // Verification
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428
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429 void instanceRefKlass::oop_verify_on(oop obj, outputStream* st) {
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430 instanceKlass::oop_verify_on(obj, st);
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431 // Verify referent field
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432 oop referent = java_lang_ref_Reference::referent(obj);
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433
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434 // We should make this general to all heaps
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435 GenCollectedHeap* gch = NULL;
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436 if (Universe::heap()->kind() == CollectedHeap::GenCollectedHeap)
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437 gch = GenCollectedHeap::heap();
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438
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439 if (referent != NULL) {
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440 guarantee(referent->is_oop(), "referent field heap failed");
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441 if (gch != NULL && !gch->is_in_youngest(obj)) {
0
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442 // We do a specific remembered set check here since the referent
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443 // field is not part of the oop mask and therefore skipped by the
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444 // regular verify code.
113
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diff changeset
445 if (UseCompressedOops) {
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diff changeset
446 narrowOop* referent_addr = (narrowOop*)java_lang_ref_Reference::referent_addr(obj);
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447 obj->verify_old_oop(referent_addr, true);
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448 } else {
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449 oop* referent_addr = (oop*)java_lang_ref_Reference::referent_addr(obj);
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450 obj->verify_old_oop(referent_addr, true);
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451 }
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452 }
0
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453 }
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454 // Verify next field
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455 oop next = java_lang_ref_Reference::next(obj);
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456 if (next != NULL) {
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diff changeset
457 guarantee(next->is_oop(), "next field verify failed");
0
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458 guarantee(next->is_instanceRef(), "next field verify failed");
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459 if (gch != NULL && !gch->is_in_youngest(obj)) {
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460 // We do a specific remembered set check here since the next field is
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461 // not part of the oop mask and therefore skipped by the regular
a61af66fc99e Initial load
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parents:
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462 // verify code.
113
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parents: 0
diff changeset
463 if (UseCompressedOops) {
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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diff changeset
464 narrowOop* next_addr = (narrowOop*)java_lang_ref_Reference::next_addr(obj);
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coleenp
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diff changeset
465 obj->verify_old_oop(next_addr, true);
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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diff changeset
466 } else {
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diff changeset
467 oop* next_addr = (oop*)java_lang_ref_Reference::next_addr(obj);
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diff changeset
468 obj->verify_old_oop(next_addr, true);
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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diff changeset
469 }
0
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470 }
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471 }
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472 }
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473
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474 void instanceRefKlass::acquire_pending_list_lock(BasicLock *pending_list_basic_lock) {
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475 // we may enter this with pending exception set
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476 PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument
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477 Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock());
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478 ObjectSynchronizer::fast_enter(h_lock, pending_list_basic_lock, false, THREAD);
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479 assert(ObjectSynchronizer::current_thread_holds_lock(
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480 JavaThread::current(), h_lock),
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481 "Locking should have succeeded");
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482 if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION;
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483 }
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484
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485 void instanceRefKlass::release_and_notify_pending_list_lock(
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486 BasicLock *pending_list_basic_lock) {
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487 // we may enter this with pending exception set
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488 PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument
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489 //
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490 Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock());
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491 assert(ObjectSynchronizer::current_thread_holds_lock(
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492 JavaThread::current(), h_lock),
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493 "Lock should be held");
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494 // Notify waiters on pending lists lock if there is any reference.
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495 if (java_lang_ref_Reference::pending_list() != NULL) {
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496 ObjectSynchronizer::notifyall(h_lock, THREAD);
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497 }
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498 ObjectSynchronizer::fast_exit(h_lock(), pending_list_basic_lock, THREAD);
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499 if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION;
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500 }