ciCallProfile.hpp revision 1472:c18cbe5936b8 
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24
25// ciCallProfile
26//
27// This class is used to determine the frequently called method
28// at some call site
29class ciCallProfile : StackObj {
30private:
31  // Fields are initialized directly by ciMethod::call_profile_at_bci.
32  friend class ciMethod;
33
34  enum { MorphismLimit = 2 }; // Max call site's morphism we care about
35  int  _limit;                // number of receivers have been determined
36  int  _morphism;             // determined call site's morphism
37  int  _count;                // # times has this call been executed
38  int  _receiver_count[MorphismLimit + 1]; // # times receivers have been seen
39  ciMethod* _method[MorphismLimit + 1];    // receivers methods
40  ciKlass*  _receiver[MorphismLimit + 1];  // receivers (exact)
41
42  ciCallProfile() {
43    _limit = 0;
44    _morphism    = 0;
45    _count = -1;
46    _receiver_count[0] = -1;
47    _method[0]   = NULL;
48    _receiver[0] = NULL;
49  }
50
51  void add_receiver(ciKlass* receiver, int receiver_count);
52
53public:
54  // Note:  The following predicates return false for invalid profiles:
55  bool      has_receiver(int i) { return _limit > i; }
56  int       morphism()          { return _morphism; }
57
58  int       count()             { return _count; }
59  int       receiver_count(int i)  {
60    assert(i < _limit, "out of Call Profile MorphismLimit");
61    return _receiver_count[i];
62  }
63  float     receiver_prob(int i)  {
64    assert(i < _limit, "out of Call Profile MorphismLimit");
65    return (float)_receiver_count[i]/(float)_count;
66  }
67  ciMethod* method(int i)          {
68    assert(i < _limit, "out of Call Profile MorphismLimit");
69    return _method[i];
70  }
71  ciKlass*  receiver(int i)        {
72    assert(i < _limit, "out of Call Profile MorphismLimit");
73    return _receiver[i];
74  }
75};
76