137 &follow_code_closure);
138 }
139
140 // Process reference objects found during marking
141 ReferenceProcessor* rp = GenMarkSweep::ref_processor();
142 assert(rp == g1h->ref_processor_stw(), "Sanity");
143
144 rp->setup_policy(clear_all_softrefs);
145 const ReferenceProcessorStats& stats =
146 rp->process_discovered_references(&GenMarkSweep::is_alive,
147 &GenMarkSweep::keep_alive,
148 &GenMarkSweep::follow_stack_closure,
149 NULL,
150 gc_timer());
151 gc_tracer()->report_gc_reference_stats(stats);
152
153
154 // This is the point where the entire marking should have completed.
155 assert(GenMarkSweep::_marking_stack.is_empty(), "Marking should have completed");
156
157 // Unload classes and purge the SystemDictionary.
158 bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive);
159
160 // Unload nmethods.
161 CodeCache::do_unloading(&GenMarkSweep::is_alive, purged_class);
162
163 // Prune dead klasses from subklass/sibling/implementor lists.
164 Klass::clean_weak_klass_links(&GenMarkSweep::is_alive);
165
166 // Delete entries for dead interned string and clean up unreferenced symbols in symbol table.
167 g1h->unlink_string_and_symbol_table(&GenMarkSweep::is_alive);
168
169 if (VerifyDuringGC) {
170 HandleMark hm; // handle scope
171 #if defined(COMPILER2) || INCLUDE_JVMCI
172 DerivedPointerTableDeactivate dpt_deact;
173 #endif
174 g1h->prepare_for_verify();
175 // Note: we can verify only the heap here. When an object is
176 // marked, the previous value of the mark word (including
177 // identity hash values, ages, etc) is preserved, and the mark
178 // word is set to markOop::marked_value - effectively removing
179 // any hash values from the mark word. These hash values are
180 // used when verifying the dictionaries and so removing them
181 // from the mark word can make verification of the dictionaries
182 // fail. At the end of the GC, the original mark word values
183 // (including hash values) are restored to the appropriate
184 // objects.
185 GCTraceTime(Info, gc, verify)("During GC (full)");
186 g1h->verify(VerifyOption_G1UseMarkWord);
187 }
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137 &follow_code_closure);
138 }
139
140 // Process reference objects found during marking
141 ReferenceProcessor* rp = GenMarkSweep::ref_processor();
142 assert(rp == g1h->ref_processor_stw(), "Sanity");
143
144 rp->setup_policy(clear_all_softrefs);
145 const ReferenceProcessorStats& stats =
146 rp->process_discovered_references(&GenMarkSweep::is_alive,
147 &GenMarkSweep::keep_alive,
148 &GenMarkSweep::follow_stack_closure,
149 NULL,
150 gc_timer());
151 gc_tracer()->report_gc_reference_stats(stats);
152
153
154 // This is the point where the entire marking should have completed.
155 assert(GenMarkSweep::_marking_stack.is_empty(), "Marking should have completed");
156
157 {
158 GCTraceTime(Debug, gc) trace("Class Unloading", gc_timer());
159
160 // Unload classes and purge the SystemDictionary.
161 bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive);
162
163 // Unload nmethods.
164 CodeCache::do_unloading(&GenMarkSweep::is_alive, purged_class);
165
166 // Prune dead klasses from subklass/sibling/implementor lists.
167 Klass::clean_weak_klass_links(&GenMarkSweep::is_alive);
168 }
169
170 {
171 GCTraceTime(Debug, gc) trace("Scrub String and Symbol Tables", gc_timer());
172 // Delete entries for dead interned string and clean up unreferenced symbols in symbol table.
173 g1h->unlink_string_and_symbol_table(&GenMarkSweep::is_alive);
174 }
175
176 if (G1StringDedup::is_enabled()) {
177 GCTraceTime(Debug, gc) trace("String Deduplication Unlink", gc_timer());
178 G1StringDedup::unlink(&GenMarkSweep::is_alive);
179 }
180
181 if (VerifyDuringGC) {
182 HandleMark hm; // handle scope
183 #if defined(COMPILER2) || INCLUDE_JVMCI
184 DerivedPointerTableDeactivate dpt_deact;
185 #endif
186 g1h->prepare_for_verify();
187 // Note: we can verify only the heap here. When an object is
188 // marked, the previous value of the mark word (including
189 // identity hash values, ages, etc) is preserved, and the mark
190 // word is set to markOop::marked_value - effectively removing
191 // any hash values from the mark word. These hash values are
192 // used when verifying the dictionaries and so removing them
193 // from the mark word can make verification of the dictionaries
194 // fail. At the end of the GC, the original mark word values
195 // (including hash values) are restored to the appropriate
196 // objects.
197 GCTraceTime(Info, gc, verify)("During GC (full)");
198 g1h->verify(VerifyOption_G1UseMarkWord);
199 }
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