28 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp" |
28 #include "gc_implementation/parallelScavenge/cardTableExtension.hpp" |
29 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" |
29 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" |
30 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp" |
30 #include "gc_implementation/parallelScavenge/psPromotionManager.hpp" |
31 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp" |
31 #include "gc_implementation/parallelScavenge/psPromotionManager.inline.hpp" |
32 #include "gc_implementation/parallelScavenge/psScavenge.hpp" |
32 #include "gc_implementation/parallelScavenge/psScavenge.hpp" |
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33 #include "memory/iterator.hpp" |
33 |
34 |
34 inline void PSScavenge::save_to_space_top_before_gc() { |
35 inline void PSScavenge::save_to_space_top_before_gc() { |
35 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
36 ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap(); |
36 _to_space_top_before_gc = heap->young_gen()->to_space()->top(); |
37 _to_space_top_before_gc = heap->young_gen()->to_space()->top(); |
37 } |
38 } |
73 |
74 |
74 oop o = oopDesc::load_decode_heap_oop_not_null(p); |
75 oop o = oopDesc::load_decode_heap_oop_not_null(p); |
75 oop new_obj = o->is_forwarded() |
76 oop new_obj = o->is_forwarded() |
76 ? o->forwardee() |
77 ? o->forwardee() |
77 : pm->copy_to_survivor_space<promote_immediately>(o); |
78 : pm->copy_to_survivor_space<promote_immediately>(o); |
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79 |
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80 #ifndef PRODUCT |
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81 // This code must come after the CAS test, or it will print incorrect |
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82 // information. |
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83 if (TraceScavenge && o->is_forwarded()) { |
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84 gclog_or_tty->print_cr("{%s %s " PTR_FORMAT " -> " PTR_FORMAT " (%d)}", |
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85 "forwarding", |
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86 new_obj->klass()->internal_name(), o, new_obj, new_obj->size()); |
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87 } |
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88 #endif |
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89 |
78 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
90 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
79 |
91 |
80 // We cannot mark without test, as some code passes us pointers |
92 // We cannot mark without test, as some code passes us pointers |
81 // that are outside the heap. |
93 // that are outside the heap. These pointers are either from roots |
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94 // or from metadata. |
82 if ((!PSScavenge::is_obj_in_young((HeapWord*)p)) && |
95 if ((!PSScavenge::is_obj_in_young((HeapWord*)p)) && |
83 Universe::heap()->is_in_reserved(p)) { |
96 Universe::heap()->is_in_reserved(p)) { |
84 if (PSScavenge::is_obj_in_young((HeapWord*)new_obj)) { |
97 if (PSScavenge::is_obj_in_young((HeapWord*)new_obj)) { |
85 card_table()->inline_write_ref_field_gc(p, new_obj); |
98 card_table()->inline_write_ref_field_gc(p, new_obj); |
86 } |
99 } |
106 }; |
119 }; |
107 |
120 |
108 typedef PSRootsClosure</*promote_immediately=*/false> PSScavengeRootsClosure; |
121 typedef PSRootsClosure</*promote_immediately=*/false> PSScavengeRootsClosure; |
109 typedef PSRootsClosure</*promote_immediately=*/true> PSPromoteRootsClosure; |
122 typedef PSRootsClosure</*promote_immediately=*/true> PSPromoteRootsClosure; |
110 |
123 |
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124 // Scavenges a single oop in a Klass. |
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125 class PSScavengeFromKlassClosure: public OopClosure { |
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126 private: |
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127 PSPromotionManager* _pm; |
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128 // Used to redirty a scanned klass if it has oops |
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129 // pointing to the young generation after being scanned. |
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130 Klass* _scanned_klass; |
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131 public: |
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132 PSScavengeFromKlassClosure(PSPromotionManager* pm) : _pm(pm), _scanned_klass(NULL) { } |
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133 void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
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134 void do_oop(oop* p) { |
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135 ParallelScavengeHeap* psh = ParallelScavengeHeap::heap(); |
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136 assert(!psh->is_in_reserved(p), "GC barrier needed"); |
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137 if (PSScavenge::should_scavenge(p)) { |
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138 assert(!Universe::heap()->is_in_reserved(p), "Not from meta-data?"); |
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139 assert(PSScavenge::should_scavenge(p, true), "revisiting object?"); |
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140 |
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141 oop o = *p; |
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142 oop new_obj; |
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143 if (o->is_forwarded()) { |
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144 new_obj = o->forwardee(); |
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145 } else { |
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146 new_obj = _pm->copy_to_survivor_space</*promote_immediately=*/false>(o); |
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147 } |
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148 oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
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149 |
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150 if (PSScavenge::is_obj_in_young((HeapWord*)new_obj)) { |
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151 do_klass_barrier(); |
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152 } |
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153 } |
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154 } |
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155 |
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156 void set_scanned_klass(Klass* klass) { |
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157 assert(_scanned_klass == NULL || klass == NULL, "Should always only handling one klass at a time"); |
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158 _scanned_klass = klass; |
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159 } |
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160 |
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161 private: |
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162 void do_klass_barrier() { |
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163 assert(_scanned_klass != NULL, "Should not be called without having a scanned klass"); |
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164 _scanned_klass->record_modified_oops(); |
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165 } |
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166 |
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167 }; |
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168 |
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169 // Scavenges the oop in a Klass. |
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170 class PSScavengeKlassClosure: public KlassClosure { |
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171 private: |
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172 PSScavengeFromKlassClosure _oop_closure; |
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173 protected: |
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174 public: |
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175 PSScavengeKlassClosure(PSPromotionManager* pm) : _oop_closure(pm) { } |
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176 void do_klass(Klass* klass) { |
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177 // If the klass has not been dirtied we know that there's |
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178 // no references into the young gen and we can skip it. |
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179 |
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180 #ifndef PRODUCT |
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181 if (TraceScavenge) { |
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182 ResourceMark rm; |
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183 gclog_or_tty->print_cr("PSScavengeKlassClosure::do_klass %p, %s, dirty: %s", |
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184 klass, |
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185 klass->external_name(), |
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186 klass->has_modified_oops() ? "true" : "false"); |
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187 } |
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188 #endif |
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189 |
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190 if (klass->has_modified_oops()) { |
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191 // Clean the klass since we're going to scavenge all the metadata. |
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192 klass->clear_modified_oops(); |
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193 |
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194 // Setup the promotion manager to redirty this klass |
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195 // if references are left in the young gen. |
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196 _oop_closure.set_scanned_klass(klass); |
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197 |
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198 klass->oops_do(&_oop_closure); |
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199 |
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200 _oop_closure.set_scanned_klass(NULL); |
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201 } |
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202 } |
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203 }; |
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204 |
111 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP |
205 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PSSCAVENGE_INLINE_HPP |