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src/hotspot/share/gc/g1/g1SharedClosures.hpp

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28 
29 class G1CollectedHeap;
30 class G1ParScanThreadState;
31 
32 // Simple holder object for a complete set of closures used by the G1 evacuation code.
33 template <bool should_mark>
34 class G1SharedClosures {
35 public:
36   G1ParCopyClosure<G1BarrierNone, should_mark> _oops;
37   G1ParCopyClosure<G1BarrierCLD,  should_mark> _oops_in_cld;
38   // We do not need (and actually should not) collect oops from nmethods into the
39   // optional collection set as we already automatically collect the corresponding
40   // nmethods in the region's strong code roots set. So set G1BarrierNoOptRoots in
41   // this closure.
42   // If these were present there would be opportunity for multiple threads to try
43   // to change this oop* at the same time. Since embedded oops are not necessarily
44   // word-aligned, this could lead to word tearing during update and crashes.
45   G1ParCopyClosure<G1BarrierNoOptRoots, should_mark> _oops_in_nmethod;
46 
47   G1CLDScanClosure                _clds;
48   G1CodeBlobClosure               _codeblobs;

49 
50   G1SharedClosures(G1CollectedHeap* g1h, G1ParScanThreadState* pss, bool process_only_dirty) :
51     _oops(g1h, pss),
52     _oops_in_cld(g1h, pss),
53     _oops_in_nmethod(g1h, pss),
54     _clds(&_oops_in_cld, process_only_dirty),
55     _codeblobs(pss->worker_id(), &_oops_in_nmethod, should_mark) {}



56 };

28 
29 class G1CollectedHeap;
30 class G1ParScanThreadState;
31 
32 // Simple holder object for a complete set of closures used by the G1 evacuation code.
33 template <bool should_mark>
34 class G1SharedClosures {
35 public:
36   G1ParCopyClosure<G1BarrierNone, should_mark> _oops;
37   G1ParCopyClosure<G1BarrierCLD,  should_mark> _oops_in_cld;
38   // We do not need (and actually should not) collect oops from nmethods into the
39   // optional collection set as we already automatically collect the corresponding
40   // nmethods in the region's strong code roots set. So set G1BarrierNoOptRoots in
41   // this closure.
42   // If these were present there would be opportunity for multiple threads to try
43   // to change this oop* at the same time. Since embedded oops are not necessarily
44   // word-aligned, this could lead to word tearing during update and crashes.
45   G1ParCopyClosure<G1BarrierNoOptRoots, should_mark> _oops_in_nmethod;
46 
47   G1CLDScanClosure                _clds;
48   G1CodeBlobClosure               _strong_codeblobs;
49   G1CodeBlobClosure               _weak_codeblobs;
50 
51   G1SharedClosures(G1CollectedHeap* g1h, G1ParScanThreadState* pss, bool process_only_dirty) :
52     _oops(g1h, pss),
53     _oops_in_cld(g1h, pss),
54     _oops_in_nmethod(g1h, pss),
55     _clds(&_oops_in_cld, process_only_dirty),
56     _strong_codeblobs(pss->worker_id(), &_oops_in_nmethod, should_mark, true),
57     _weak_codeblobs(pss->worker_id(), &_oops_in_nmethod, should_mark, false)
58 
59     {}
60 };
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