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0
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1 /*
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2 * Copyright 1997-2006 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 void instanceRefKlass::oop_follow_contents(oop obj) {
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29 oop* referent_addr = java_lang_ref_Reference::referent_addr(obj);
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30 oop referent = *referent_addr;
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31 debug_only(
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32 if(TraceReferenceGC && PrintGCDetails) {
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33 gclog_or_tty->print_cr("instanceRefKlass::oop_follow_contents " INTPTR_FORMAT, (address)obj);
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34 }
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35 )
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36 if (referent != NULL) {
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37 if (!referent->is_gc_marked() &&
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38 MarkSweep::ref_processor()->
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39 discover_reference(obj, reference_type())) {
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40 // reference already enqueued, referent will be traversed later
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41 instanceKlass::oop_follow_contents(obj);
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42 debug_only(
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43 if(TraceReferenceGC && PrintGCDetails) {
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44 gclog_or_tty->print_cr(" Non NULL enqueued " INTPTR_FORMAT, (address)obj);
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45 }
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46 )
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47 return;
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48 } else {
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49 // treat referent as normal oop
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50 debug_only(
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51 if(TraceReferenceGC && PrintGCDetails) {
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52 gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, (address)obj);
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53 }
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54 )
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55 MarkSweep::mark_and_push(referent_addr);
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56 }
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57 }
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58 // treat next as normal oop. next is a link in the pending list.
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59 oop* next_addr = java_lang_ref_Reference::next_addr(obj);
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60 debug_only(
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61 if(TraceReferenceGC && PrintGCDetails) {
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62 gclog_or_tty->print_cr(" Process next as normal " INTPTR_FORMAT, next_addr);
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63 }
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64 )
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65 MarkSweep::mark_and_push(next_addr);
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66 instanceKlass::oop_follow_contents(obj);
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67 }
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68
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69 #ifndef SERIALGC
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70 void instanceRefKlass::oop_follow_contents(ParCompactionManager* cm,
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71 oop obj) {
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72 oop* referent_addr = java_lang_ref_Reference::referent_addr(obj);
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73 oop referent = *referent_addr;
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74 debug_only(
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75 if(TraceReferenceGC && PrintGCDetails) {
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76 gclog_or_tty->print_cr("instanceRefKlass::oop_follow_contents " INTPTR_FORMAT, (address)obj);
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77 }
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78 )
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79 if (referent != NULL) {
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80 if (PSParallelCompact::mark_bitmap()->is_unmarked(referent) &&
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81 PSParallelCompact::ref_processor()->
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82 discover_reference(obj, reference_type())) {
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83 // reference already enqueued, referent will be traversed later
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84 instanceKlass::oop_follow_contents(cm, 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(" Non NULL enqueued " INTPTR_FORMAT, (address)obj);
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88 }
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89 )
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90 return;
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91 } else {
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92 // treat referent as normal oop
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93 debug_only(
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94 if(TraceReferenceGC && PrintGCDetails) {
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95 gclog_or_tty->print_cr(" Non NULL normal " INTPTR_FORMAT, (address)obj);
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96 }
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97 )
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98 PSParallelCompact::mark_and_push(cm, referent_addr);
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99 }
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100 }
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101 // treat next as normal oop. next is a link in the pending list.
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102 oop* next_addr = java_lang_ref_Reference::next_addr(obj);
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103 debug_only(
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104 if(TraceReferenceGC && PrintGCDetails) {
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105 gclog_or_tty->print_cr(" Process next as normal " INTPTR_FORMAT, next_addr);
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106 }
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107 )
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108 PSParallelCompact::mark_and_push(cm, next_addr);
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109 instanceKlass::oop_follow_contents(cm, obj);
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110 }
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111 #endif // SERIALGC
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112
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113
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114 int instanceRefKlass::oop_adjust_pointers(oop obj) {
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115 int size = size_helper();
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116 instanceKlass::oop_adjust_pointers(obj);
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117
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118 oop* referent_addr = java_lang_ref_Reference::referent_addr(obj);
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119 MarkSweep::adjust_pointer(referent_addr);
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120 oop* next_addr = java_lang_ref_Reference::next_addr(obj);
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121 MarkSweep::adjust_pointer(next_addr);
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122 oop* discovered_addr = java_lang_ref_Reference::discovered_addr(obj);
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123 MarkSweep::adjust_pointer(discovered_addr);
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124
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125 #ifdef ASSERT
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126 if(TraceReferenceGC && PrintGCDetails) {
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127 gclog_or_tty->print_cr("instanceRefKlass::oop_adjust_pointers obj "
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128 INTPTR_FORMAT, (address)obj);
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129 gclog_or_tty->print_cr(" referent_addr/* " INTPTR_FORMAT " / "
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130 INTPTR_FORMAT, referent_addr,
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131 referent_addr ? (address)*referent_addr : NULL);
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132 gclog_or_tty->print_cr(" next_addr/* " INTPTR_FORMAT " / "
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133 INTPTR_FORMAT, next_addr,
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134 next_addr ? (address)*next_addr : NULL);
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135 gclog_or_tty->print_cr(" discovered_addr/* " INTPTR_FORMAT " / "
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136 INTPTR_FORMAT, discovered_addr,
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137 discovered_addr ? (address)*discovered_addr : NULL);
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138 }
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139 #endif
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140
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141 return size;
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142 }
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143
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144 #define InstanceRefKlass_OOP_OOP_ITERATE_DEFN(OopClosureType, nv_suffix) \
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145 \
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146 int instanceRefKlass:: \
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147 oop_oop_iterate##nv_suffix(oop obj, OopClosureType* closure) { \
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148 /* Get size before changing pointers */ \
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149 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
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150 \
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151 int size = instanceKlass::oop_oop_iterate##nv_suffix(obj, closure); \
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152 \
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153 oop* referent_addr = java_lang_ref_Reference::referent_addr(obj); \
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154 oop referent = *referent_addr; \
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155 if (referent != NULL) { \
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156 ReferenceProcessor* rp = closure->_ref_processor; \
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157 if (!referent->is_gc_marked() && (rp != NULL) && \
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158 rp->discover_reference(obj, reference_type())) { \
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159 return size; \
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160 } else { \
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161 /* treat referent as normal oop */ \
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162 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\
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163 closure->do_oop##nv_suffix(referent_addr); \
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164 } \
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165 } \
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166 \
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167 /* treat next as normal oop */ \
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168 oop* next_addr = java_lang_ref_Reference::next_addr(obj); \
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169 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk); \
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170 closure->do_oop##nv_suffix(next_addr); \
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171 return size; \
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172 }
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173
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174 #define InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m(OopClosureType, nv_suffix) \
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175 \
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176 int instanceRefKlass:: \
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177 oop_oop_iterate##nv_suffix##_m(oop obj, \
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178 OopClosureType* closure, \
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179 MemRegion mr) { \
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180 SpecializationStats::record_iterate_call##nv_suffix(SpecializationStats::irk);\
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181 \
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182 int size = instanceKlass::oop_oop_iterate##nv_suffix##_m(obj, closure, mr); \
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183 \
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184 oop* referent_addr = java_lang_ref_Reference::referent_addr(obj); \
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185 oop referent = *referent_addr; \
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186 if (referent != NULL && mr.contains(referent_addr)) { \
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187 ReferenceProcessor* rp = closure->_ref_processor; \
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188 if (!referent->is_gc_marked() && (rp != NULL) && \
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189 rp->discover_reference(obj, reference_type())) { \
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190 return size; \
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191 } else { \
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192 /* treat referent as normal oop */ \
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193 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\
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194 closure->do_oop##nv_suffix(referent_addr); \
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195 } \
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196 } \
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197 \
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198 /* treat next as normal oop */ \
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199 oop* next_addr = java_lang_ref_Reference::next_addr(obj); \
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200 if (mr.contains(next_addr)) { \
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201 SpecializationStats::record_do_oop_call##nv_suffix(SpecializationStats::irk);\
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202 closure->do_oop##nv_suffix(next_addr); \
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203 } \
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204 return size; \
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205 }
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206
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207 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN)
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208 ALL_OOP_OOP_ITERATE_CLOSURES_3(InstanceRefKlass_OOP_OOP_ITERATE_DEFN)
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209 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m)
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210 ALL_OOP_OOP_ITERATE_CLOSURES_3(InstanceRefKlass_OOP_OOP_ITERATE_DEFN_m)
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211
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212
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213 #ifndef SERIALGC
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214 void instanceRefKlass::oop_copy_contents(PSPromotionManager* pm, oop obj) {
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215 assert(!pm->depth_first(), "invariant");
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216 oop* referent_addr = java_lang_ref_Reference::referent_addr(obj);
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217 if (PSScavenge::should_scavenge(*referent_addr)) {
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218 ReferenceProcessor* rp = PSScavenge::reference_processor();
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219 if (rp->discover_reference(obj, reference_type())) {
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220 // reference already enqueued, referent and next will be traversed later
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221 instanceKlass::oop_copy_contents(pm, obj);
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222 return;
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223 } else {
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224 // treat referent as normal oop
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225 pm->claim_or_forward_breadth(referent_addr);
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226 }
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227 }
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228 // treat next as normal oop
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229 oop* next_addr = java_lang_ref_Reference::next_addr(obj);
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230 if (PSScavenge::should_scavenge(*next_addr)) {
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231 pm->claim_or_forward_breadth(next_addr);
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232 }
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233 instanceKlass::oop_copy_contents(pm, obj);
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234 }
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235
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236 void instanceRefKlass::oop_push_contents(PSPromotionManager* pm, oop obj) {
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237 assert(pm->depth_first(), "invariant");
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238 oop* referent_addr = java_lang_ref_Reference::referent_addr(obj);
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239 if (PSScavenge::should_scavenge(*referent_addr)) {
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240 ReferenceProcessor* rp = PSScavenge::reference_processor();
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241 if (rp->discover_reference(obj, reference_type())) {
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242 // reference already enqueued, referent and next will be traversed later
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243 instanceKlass::oop_push_contents(pm, obj);
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244 return;
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245 } else {
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246 // treat referent as normal oop
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247 pm->claim_or_forward_depth(referent_addr);
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248 }
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249 }
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250 // treat next as normal oop
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251 oop* next_addr = java_lang_ref_Reference::next_addr(obj);
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252 if (PSScavenge::should_scavenge(*next_addr)) {
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253 pm->claim_or_forward_depth(next_addr);
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254 }
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255 instanceKlass::oop_push_contents(pm, obj);
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256 }
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257
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258 int instanceRefKlass::oop_update_pointers(ParCompactionManager* cm, oop obj) {
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259 instanceKlass::oop_update_pointers(cm, obj);
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260
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261 oop* referent_addr = java_lang_ref_Reference::referent_addr(obj);
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262 PSParallelCompact::adjust_pointer(referent_addr);
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263 oop* next_addr = java_lang_ref_Reference::next_addr(obj);
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264 PSParallelCompact::adjust_pointer(next_addr);
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265 oop* discovered_addr = java_lang_ref_Reference::discovered_addr(obj);
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266 PSParallelCompact::adjust_pointer(discovered_addr);
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267
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268 #ifdef ASSERT
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269 if(TraceReferenceGC && PrintGCDetails) {
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270 gclog_or_tty->print_cr("instanceRefKlass::oop_update_pointers obj "
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271 INTPTR_FORMAT, (oopDesc*) obj);
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272 gclog_or_tty->print_cr(" referent_addr/* " INTPTR_FORMAT " / "
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273 INTPTR_FORMAT, referent_addr,
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274 referent_addr ? (oopDesc*) *referent_addr : NULL);
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275 gclog_or_tty->print_cr(" next_addr/* " INTPTR_FORMAT " / "
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276 INTPTR_FORMAT, next_addr,
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277 next_addr ? (oopDesc*) *next_addr : NULL);
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278 gclog_or_tty->print_cr(" discovered_addr/* " INTPTR_FORMAT " / "
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279 INTPTR_FORMAT, discovered_addr,
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280 discovered_addr ? (oopDesc*) *discovered_addr : NULL);
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281 }
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282 #endif
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283
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284 return size_helper();
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285 }
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286
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287 int
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288 instanceRefKlass::oop_update_pointers(ParCompactionManager* cm, oop obj,
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289 HeapWord* beg_addr, HeapWord* end_addr) {
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290 instanceKlass::oop_update_pointers(cm, obj, beg_addr, end_addr);
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291
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292 oop* p;
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293 oop* referent_addr = p = java_lang_ref_Reference::referent_addr(obj);
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294 PSParallelCompact::adjust_pointer(p, beg_addr, end_addr);
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295 oop* next_addr = p = java_lang_ref_Reference::next_addr(obj);
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296 PSParallelCompact::adjust_pointer(p, beg_addr, end_addr);
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297 oop* discovered_addr = p = java_lang_ref_Reference::discovered_addr(obj);
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298 PSParallelCompact::adjust_pointer(p, beg_addr, end_addr);
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299
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300 #ifdef ASSERT
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301 if(TraceReferenceGC && PrintGCDetails) {
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302 gclog_or_tty->print_cr("instanceRefKlass::oop_update_pointers obj "
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303 INTPTR_FORMAT, (oopDesc*) obj);
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304 gclog_or_tty->print_cr(" referent_addr/* " INTPTR_FORMAT " / "
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305 INTPTR_FORMAT, referent_addr,
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306 referent_addr ? (oopDesc*) *referent_addr : NULL);
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307 gclog_or_tty->print_cr(" next_addr/* " INTPTR_FORMAT " / "
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308 INTPTR_FORMAT, next_addr,
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309 next_addr ? (oopDesc*) *next_addr : NULL);
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310 gclog_or_tty->print_cr(" discovered_addr/* " INTPTR_FORMAT " / "
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311 INTPTR_FORMAT, discovered_addr,
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312 discovered_addr ? (oopDesc*) *discovered_addr : NULL);
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313 }
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314 #endif
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315
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316 return size_helper();
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317 }
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318 #endif // SERIALGC
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319
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320 void instanceRefKlass::update_nonstatic_oop_maps(klassOop k) {
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321 // Clear the nonstatic oop-map entries corresponding to referent
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322 // and nextPending field. They are treated specially by the
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323 // garbage collector.
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324 // The discovered field is used only by the garbage collector
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325 // and is also treated specially.
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326 instanceKlass* ik = instanceKlass::cast(k);
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327
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328 // Check that we have the right class
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329 debug_only(static bool first_time = true);
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330 assert(k == SystemDictionary::reference_klass() && first_time,
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331 "Invalid update of maps");
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332 debug_only(first_time = false);
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333 assert(ik->nonstatic_oop_map_size() == 1, "just checking");
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334
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335 OopMapBlock* map = ik->start_of_nonstatic_oop_maps();
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336
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337 // Check that the current map is (2,4) - currently points at field with
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338 // offset 2 (words) and has 4 map entries.
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339 debug_only(int offset = java_lang_ref_Reference::referent_offset);
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340 debug_only(int length = ((java_lang_ref_Reference::discovered_offset -
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341 java_lang_ref_Reference::referent_offset)/wordSize) + 1);
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342
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343 if (UseSharedSpaces) {
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344 assert(map->offset() == java_lang_ref_Reference::queue_offset &&
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345 map->length() == 1, "just checking");
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346 } else {
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347 assert(map->offset() == offset && map->length() == length,
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348 "just checking");
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349
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350 // Update map to (3,1) - point to offset of 3 (words) with 1 map entry.
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351 map->set_offset(java_lang_ref_Reference::queue_offset);
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352 map->set_length(1);
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353 }
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354 }
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355
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356
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357 // Verification
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358
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359 void instanceRefKlass::oop_verify_on(oop obj, outputStream* st) {
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360 instanceKlass::oop_verify_on(obj, st);
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361 // Verify referent field
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362 oop referent = java_lang_ref_Reference::referent(obj);
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363
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364 // We should make this general to all heaps
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365 GenCollectedHeap* gch = NULL;
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366 if (Universe::heap()->kind() == CollectedHeap::GenCollectedHeap)
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367 gch = GenCollectedHeap::heap();
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368
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369 if (referent != NULL) {
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370 guarantee(referent->is_oop(), "referent field heap failed");
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371 if (gch != NULL && !gch->is_in_youngest(obj))
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372 // We do a specific remembered set check here since the referent
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373 // field is not part of the oop mask and therefore skipped by the
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374 // regular verify code.
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375 obj->verify_old_oop(java_lang_ref_Reference::referent_addr(obj), true);
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376 }
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377 // Verify next field
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378 oop next = java_lang_ref_Reference::next(obj);
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379 if (next != NULL) {
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380 guarantee(next->is_oop(), "next field verify failed");
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381 guarantee(next->is_instanceRef(), "next field verify failed");
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382 if (gch != NULL && !gch->is_in_youngest(obj)) {
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383 // We do a specific remembered set check here since the next field is
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384 // not part of the oop mask and therefore skipped by the regular
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385 // verify code.
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386 obj->verify_old_oop(java_lang_ref_Reference::next_addr(obj), true);
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387 }
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388 }
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389 }
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390
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391 void instanceRefKlass::acquire_pending_list_lock(BasicLock *pending_list_basic_lock) {
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392 // we may enter this with pending exception set
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393 PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument
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394 Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock());
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395 ObjectSynchronizer::fast_enter(h_lock, pending_list_basic_lock, false, THREAD);
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396 assert(ObjectSynchronizer::current_thread_holds_lock(
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397 JavaThread::current(), h_lock),
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398 "Locking should have succeeded");
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399 if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION;
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400 }
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401
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402 void instanceRefKlass::release_and_notify_pending_list_lock(
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403 BasicLock *pending_list_basic_lock) {
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404 // we may enter this with pending exception set
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405 PRESERVE_EXCEPTION_MARK; // exceptions are never thrown, needed for TRAPS argument
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406 //
|
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407 Handle h_lock(THREAD, java_lang_ref_Reference::pending_list_lock());
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408 assert(ObjectSynchronizer::current_thread_holds_lock(
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409 JavaThread::current(), h_lock),
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410 "Lock should be held");
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411 // Notify waiters on pending lists lock if there is any reference.
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412 if (java_lang_ref_Reference::pending_list() != NULL) {
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413 ObjectSynchronizer::notifyall(h_lock, THREAD);
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|
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414 }
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415 ObjectSynchronizer::fast_exit(h_lock(), pending_list_basic_lock, THREAD);
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|
|
416 if (HAS_PENDING_EXCEPTION) CLEAR_PENDING_EXCEPTION;
|
|
|
417 }
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