49   };
50 
51   GrowableArray<ObjectSampleMarkWord>* _store;
52 
53  public:
54   ObjectSampleMarker() :
55        _store(new GrowableArray<ObjectSampleMarkWord>(16)) {}
56   ~ObjectSampleMarker() {
57     assert(_store != NULL, "invariant");
58     // restore the saved, original, markWord for sample objects
59     while (_store->is_nonempty()) {
60       ObjectSampleMarkWord sample_oop = _store->pop();
61       sample_oop._obj->set_mark(sample_oop._mark_word);
62       assert(sample_oop._obj->mark() == sample_oop._mark_word, "invariant");
63     }
64   }
65 
66   void mark(oop obj) {
67     assert(obj != NULL, "invariant");
68     // save the original markWord
69     _store->push(ObjectSampleMarkWord(obj, obj->mark()));

70     // now we will set the mark word to "marked" in order to quickly
71     // identify sample objects during the reachability search from gc roots.
72     assert(!obj->mark().is_marked(), "should only mark an object once");
73     obj->set_mark(markWord::prototype().set_marked());










74     assert(obj->mark().is_marked(), "invariant");
75   }
76 };
77 
78 #endif // SHARE_JFR_LEAKPROFILER_CHAINS_OBJECTSAMPLEMARKER_HPP

49   };
50 
51   GrowableArray<ObjectSampleMarkWord>* _store;
52 
53  public:
54   ObjectSampleMarker() :
55        _store(new GrowableArray<ObjectSampleMarkWord>(16)) {}
56   ~ObjectSampleMarker() {
57     assert(_store != NULL, "invariant");
58     // restore the saved, original, markWord for sample objects
59     while (_store->is_nonempty()) {
60       ObjectSampleMarkWord sample_oop = _store->pop();
61       sample_oop._obj->set_mark(sample_oop._mark_word);
62       assert(sample_oop._obj->mark() == sample_oop._mark_word, "invariant");
63     }
64   }
65 
66   void mark(oop obj) {
67     assert(obj != NULL, "invariant");
68     // save the original markWord
69     markWord mark = obj->mark();
70     _store->push(ObjectSampleMarkWord(obj, mark));
71     // now we will set the mark word to "marked" in order to quickly
72     // identify sample objects during the reachability search from gc roots.
73     assert(!obj->mark().is_marked(), "should only mark an object once");
74 #ifdef _LP64
75     if (UseCompactObjectHeaders) {
76       if (mark.has_displaced_mark_helper()) {
77         mark = mark.displaced_mark_helper();
78       }
79       obj->set_mark(markWord::prototype().set_marked().set_narrow_klass(mark.narrow_klass()));
80     } else
81 #endif
82     {
83       obj->set_mark(markWord::prototype().set_marked());
84     }
85     assert(obj->mark().is_marked(), "invariant");
86   }
87 };
88 
89 #endif // SHARE_JFR_LEAKPROFILER_CHAINS_OBJECTSAMPLEMARKER_HPP