Tue, 19 Aug 2014 02:05:49 -0700
8044406: JVM crash with JDK8 (build 1.8.0-b132) with G1 GC
Summary: Fill the last card that has been allocated into with a dummy object
Reviewed-by: tschatzl, mgerdin
1 /*
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP
28 #include "gc_implementation/g1/g1RemSet.hpp"
29 #include "gc_implementation/g1/heapRegionRemSet.hpp"
30 #include "oops/oop.inline.hpp"
32 inline uint G1RemSet::n_workers() {
33 if (_g1->workers() != NULL) {
34 return _g1->workers()->total_workers();
35 } else {
36 return 1;
37 }
38 }
40 template <class T>
41 inline void G1RemSet::write_ref(HeapRegion* from, T* p) {
42 par_write_ref(from, p, 0);
43 }
45 template <class T>
46 inline void G1RemSet::par_write_ref(HeapRegion* from, T* p, int tid) {
47 oop obj = oopDesc::load_decode_heap_oop(p);
48 #ifdef ASSERT
49 // can't do because of races
50 // assert(obj == NULL || obj->is_oop(), "expected an oop");
52 // Do the safe subset of is_oop
53 if (obj != NULL) {
54 #ifdef CHECK_UNHANDLED_OOPS
55 oopDesc* o = obj.obj();
56 #else
57 oopDesc* o = obj;
58 #endif // CHECK_UNHANDLED_OOPS
59 assert((intptr_t)o % MinObjAlignmentInBytes == 0, "not oop aligned");
60 assert(Universe::heap()->is_in_reserved(obj), "must be in heap");
61 }
62 #endif // ASSERT
64 assert(from == NULL || from->is_in_reserved(p), "p is not in from");
66 HeapRegion* to = _g1->heap_region_containing(obj);
67 if (to != NULL && from != to) {
68 assert(to->rem_set() != NULL, "Need per-region 'into' remsets.");
69 to->rem_set()->add_reference(p, tid);
70 }
71 }
73 template <class T>
74 inline void UpdateRSOopClosure::do_oop_work(T* p) {
75 assert(_from != NULL, "from region must be non-NULL");
76 _rs->par_write_ref(_from, p, _worker_i);
77 }
79 template <class T>
80 inline void UpdateRSetImmediate::do_oop_work(T* p) {
81 assert(_from->is_in_reserved(p), "paranoia");
82 T heap_oop = oopDesc::load_heap_oop(p);
83 if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) {
84 _g1_rem_set->par_write_ref(_from, p, 0);
85 }
86 }
88 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1REMSET_INLINE_HPP