1 /*
   2  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
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  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
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  24 
  25 #ifndef SHARE_VM_CI_CICALLPROFILE_HPP
  26 #define SHARE_VM_CI_CICALLPROFILE_HPP
  27 
  28 #include "ci/ciClassList.hpp"
  29 
  30 // ciCallProfile
  31 //
  32 // This class is used to determine the frequently called method
  33 // at some call site
  34 class ciCallProfile : StackObj {
  35 private:
  36   // Fields are initialized directly by ciMethod::call_profile_at_bci.
  37   friend class ciMethod;
  38 
  39   enum { MorphismLimit = 2 }; // Max call site's morphism we care about
  40   int  _limit;                // number of receivers have been determined
  41   int  _morphism;             // determined call site's morphism
  42   int  _count;                // # times has this call been executed
  43   int  _receiver_count[MorphismLimit + 1]; // # times receivers have been seen
  44   ciMethod* _method[MorphismLimit + 1];    // receivers methods
  45   ciKlass*  _receiver[MorphismLimit + 1];  // receivers (exact)
  46 
  47   ciCallProfile() {
  48     _limit = 0;
  49     _morphism    = 0;
  50     _count = -1;
  51     _receiver_count[0] = -1;
  52     _method[0]   = NULL;
  53     _receiver[0] = NULL;
  54   }
  55 
  56   void add_receiver(ciKlass* receiver, int receiver_count);
  57 
  58 public:
  59   // Note:  The following predicates return false for invalid profiles:
  60   bool      has_receiver(int i) { return _limit > i; }
  61   int       morphism()          { return _morphism; }
  62 
  63   int       count()             { return _count; }
  64   int       receiver_count(int i)  {
  65     assert(i < _limit, "out of Call Profile MorphismLimit");
  66     return _receiver_count[i];
  67   }
  68   float     receiver_prob(int i)  {
  69     assert(i < _limit, "out of Call Profile MorphismLimit");
  70     return (float)_receiver_count[i]/(float)_count;
  71   }
  72   ciMethod* method(int i)          {
  73     assert(i < _limit, "out of Call Profile MorphismLimit");
  74     return _method[i];
  75   }
  76   ciKlass*  receiver(int i)        {
  77     assert(i < _limit, "out of Call Profile MorphismLimit");
  78     return _receiver[i];
  79   }
  80 };
  81 
  82 #endif // SHARE_VM_CI_CICALLPROFILE_HPP