57
58 class HeapRegion;
59
60 bool G1MarkSweep::_archive_check_enabled = false;
61 G1ArchiveRegionMap G1MarkSweep::_archive_region_map;
62
63 void G1MarkSweep::invoke_at_safepoint(ReferenceProcessor* rp,
64 bool clear_all_softrefs) {
65 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
66
67 #ifdef ASSERT
68 if (G1CollectedHeap::heap()->collector_policy()->should_clear_all_soft_refs()) {
69 assert(clear_all_softrefs, "Policy should have been checked earler");
70 }
71 #endif
72 // hook up weak ref data so it can be used during Mark-Sweep
73 assert(GenMarkSweep::ref_processor() == NULL, "no stomping");
74 assert(rp != NULL, "should be non-NULL");
75 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Precondition");
76
77 GenMarkSweep::_ref_processor = rp;
78 rp->setup_policy(clear_all_softrefs);
79
80 // When collecting the permanent generation Method*s may be moving,
81 // so we either have to flush all bcp data or convert it into bci.
82 CodeCache::gc_prologue();
83
84 bool marked_for_unloading = false;
85
86 allocate_stacks();
87
88 // We should save the marks of the currently locked biased monitors.
89 // The marking doesn't preserve the marks of biased objects.
90 BiasedLocking::preserve_marks();
91
92 mark_sweep_phase1(marked_for_unloading, clear_all_softrefs);
93
94 mark_sweep_phase2();
95
96 // Don't add any more derived pointers during phase3
97 COMPILER2_PRESENT(DerivedPointerTable::set_active(false));
98
99 mark_sweep_phase3();
100
101 mark_sweep_phase4();
102
103 GenMarkSweep::restore_marks();
104 BiasedLocking::restore_marks();
105 GenMarkSweep::deallocate_stacks();
106
107 CodeCache::gc_epilogue();
108 JvmtiExport::gc_epilogue();
109
110 // refs processing: clean slate
111 GenMarkSweep::_ref_processor = NULL;
112 }
113
114
115 void G1MarkSweep::allocate_stacks() {
116 GenMarkSweep::_preserved_count_max = 0;
117 GenMarkSweep::_preserved_marks = NULL;
118 GenMarkSweep::_preserved_count = 0;
119 }
120
121 void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading,
122 bool clear_all_softrefs) {
123 // Recursively traverse all live objects and mark them
124 GCTraceTime tm("phase 1", G1Log::fine() && Verbose, true, gc_timer(), gc_tracer()->gc_id());
125
126 G1CollectedHeap* g1h = G1CollectedHeap::heap();
127
128 // Need cleared claim bits for the roots processing
129 ClassLoaderDataGraph::clear_claimed_marks();
130
131 MarkingCodeBlobClosure follow_code_closure(&GenMarkSweep::follow_root_closure, !CodeBlobToOopClosure::FixRelocations);
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57
58 class HeapRegion;
59
60 bool G1MarkSweep::_archive_check_enabled = false;
61 G1ArchiveRegionMap G1MarkSweep::_archive_region_map;
62
63 void G1MarkSweep::invoke_at_safepoint(ReferenceProcessor* rp,
64 bool clear_all_softrefs) {
65 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint");
66
67 #ifdef ASSERT
68 if (G1CollectedHeap::heap()->collector_policy()->should_clear_all_soft_refs()) {
69 assert(clear_all_softrefs, "Policy should have been checked earler");
70 }
71 #endif
72 // hook up weak ref data so it can be used during Mark-Sweep
73 assert(GenMarkSweep::ref_processor() == NULL, "no stomping");
74 assert(rp != NULL, "should be non-NULL");
75 assert(rp == G1CollectedHeap::heap()->ref_processor_stw(), "Precondition");
76
77 GenMarkSweep::set_ref_processor(rp);
78 rp->setup_policy(clear_all_softrefs);
79
80 // When collecting the permanent generation Method*s may be moving,
81 // so we either have to flush all bcp data or convert it into bci.
82 CodeCache::gc_prologue();
83
84 bool marked_for_unloading = false;
85
86 allocate_stacks();
87
88 // We should save the marks of the currently locked biased monitors.
89 // The marking doesn't preserve the marks of biased objects.
90 BiasedLocking::preserve_marks();
91
92 mark_sweep_phase1(marked_for_unloading, clear_all_softrefs);
93
94 mark_sweep_phase2();
95
96 // Don't add any more derived pointers during phase3
97 COMPILER2_PRESENT(DerivedPointerTable::set_active(false));
98
99 mark_sweep_phase3();
100
101 mark_sweep_phase4();
102
103 GenMarkSweep::restore_marks();
104 BiasedLocking::restore_marks();
105 GenMarkSweep::deallocate_stacks();
106
107 CodeCache::gc_epilogue();
108 JvmtiExport::gc_epilogue();
109
110 // refs processing: clean slate
111 GenMarkSweep::set_ref_processor(NULL);
112 }
113
114
115 void G1MarkSweep::allocate_stacks() {
116 GenMarkSweep::_preserved_count_max = 0;
117 GenMarkSweep::_preserved_marks = NULL;
118 GenMarkSweep::_preserved_count = 0;
119 }
120
121 void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading,
122 bool clear_all_softrefs) {
123 // Recursively traverse all live objects and mark them
124 GCTraceTime tm("phase 1", G1Log::fine() && Verbose, true, gc_timer(), gc_tracer()->gc_id());
125
126 G1CollectedHeap* g1h = G1CollectedHeap::heap();
127
128 // Need cleared claim bits for the roots processing
129 ClassLoaderDataGraph::clear_claimed_marks();
130
131 MarkingCodeBlobClosure follow_code_closure(&GenMarkSweep::follow_root_closure, !CodeBlobToOopClosure::FixRelocations);
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