Fri, 18 Feb 2011 10:07:34 -0800
7020042: G1: Partially remove fix for 6994628
Summary: Disable reference discovery and processing during concurrent marking by disabling fix for 6994628.
Reviewed-by: tonyp, ysr
1 /*
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP
28 #include "memory/cardTableModRefBS.hpp"
29 #include "memory/memRegion.hpp"
30 #include "oops/oop.inline.hpp"
32 #ifndef SERIALGC
34 class DirtyCardQueueSet;
36 // This barrier is specialized to use a logging barrier to support
37 // snapshot-at-the-beginning marking.
39 class G1SATBCardTableModRefBS: public CardTableModRefBSForCTRS {
40 private:
41 // Add "pre_val" to a set of objects that may have been disconnected from the
42 // pre-marking object graph.
43 static void enqueue(oop pre_val);
45 public:
46 G1SATBCardTableModRefBS(MemRegion whole_heap,
47 int max_covered_regions);
49 bool is_a(BarrierSet::Name bsn) {
50 return bsn == BarrierSet::G1SATBCT || CardTableModRefBS::is_a(bsn);
51 }
53 virtual bool has_write_ref_pre_barrier() { return true; }
55 // This notes that we don't need to access any BarrierSet data
56 // structures, so this can be called from a static context.
57 template <class T> static void write_ref_field_pre_static(T* field, oop newVal) {
58 T heap_oop = oopDesc::load_heap_oop(field);
59 if (!oopDesc::is_null(heap_oop)) {
60 enqueue(oopDesc::decode_heap_oop(heap_oop));
61 }
62 }
64 // When we know the current java thread:
65 template <class T> static void write_ref_field_pre_static(T* field, oop newVal,
66 JavaThread* jt);
68 // We export this to make it available in cases where the static
69 // type of the barrier set is known. Note that it is non-virtual.
70 template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal) {
71 write_ref_field_pre_static(field, newVal);
72 }
74 // These are the more general virtual versions.
75 virtual void write_ref_field_pre_work(oop* field, oop new_val) {
76 inline_write_ref_field_pre(field, new_val);
77 }
78 virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) {
79 inline_write_ref_field_pre(field, new_val);
80 }
81 virtual void write_ref_field_pre_work(void* field, oop new_val) {
82 guarantee(false, "Not needed");
83 }
85 template <class T> void write_ref_array_pre_work(T* dst, int count);
86 virtual void write_ref_array_pre(oop* dst, int count, bool dest_uninitialized) {
87 if (!dest_uninitialized) {
88 write_ref_array_pre_work(dst, count);
89 }
90 }
91 virtual void write_ref_array_pre(narrowOop* dst, int count, bool dest_uninitialized) {
92 if (!dest_uninitialized) {
93 write_ref_array_pre_work(dst, count);
94 }
95 }
96 };
98 // Adds card-table logging to the post-barrier.
99 // Usual invariant: all dirty cards are logged in the DirtyCardQueueSet.
100 class G1SATBCardTableLoggingModRefBS: public G1SATBCardTableModRefBS {
101 private:
102 DirtyCardQueueSet& _dcqs;
103 public:
104 G1SATBCardTableLoggingModRefBS(MemRegion whole_heap,
105 int max_covered_regions);
107 bool is_a(BarrierSet::Name bsn) {
108 return bsn == BarrierSet::G1SATBCTLogging ||
109 G1SATBCardTableModRefBS::is_a(bsn);
110 }
112 void write_ref_field_work(void* field, oop new_val);
114 // Can be called from static contexts.
115 static void write_ref_field_static(void* field, oop new_val);
117 // NB: if you do a whole-heap invalidation, the "usual invariant" defined
118 // above no longer applies.
119 void invalidate(MemRegion mr, bool whole_heap = false);
121 void write_region_work(MemRegion mr) { invalidate(mr); }
122 void write_ref_array_work(MemRegion mr) { invalidate(mr); }
125 };
128 #endif // SERIALGC
130 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1SATBCARDTABLEMODREFBS_HPP