duke@435: /*
stefank@2314:  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #ifndef SHARE_VM_CI_CICALLPROFILE_HPP
stefank@2314: #define SHARE_VM_CI_CICALLPROFILE_HPP
stefank@2314: 
stefank@2314: #include "ci/ciClassList.hpp"
stefank@2325: #include "memory/allocation.hpp"
stefank@2314: 
duke@435: // ciCallProfile
duke@435: //
duke@435: // This class is used to determine the frequently called method
duke@435: // at some call site
duke@435: class ciCallProfile : StackObj {
duke@435: private:
duke@435:   // Fields are initialized directly by ciMethod::call_profile_at_bci.
duke@435:   friend class ciMethod;
never@2949:   friend class ciMethodHandle;
duke@435: 
duke@435:   enum { MorphismLimit = 2 }; // Max call site's morphism we care about
duke@435:   int  _limit;                // number of receivers have been determined
duke@435:   int  _morphism;             // determined call site's morphism
duke@435:   int  _count;                // # times has this call been executed
duke@435:   int  _receiver_count[MorphismLimit + 1]; // # times receivers have been seen
duke@435:   ciMethod* _method[MorphismLimit + 1];    // receivers methods
duke@435:   ciKlass*  _receiver[MorphismLimit + 1];  // receivers (exact)
duke@435: 
duke@435:   ciCallProfile() {
duke@435:     _limit = 0;
duke@435:     _morphism    = 0;
duke@435:     _count = -1;
duke@435:     _receiver_count[0] = -1;
duke@435:     _method[0]   = NULL;
duke@435:     _receiver[0] = NULL;
duke@435:   }
duke@435: 
duke@435:   void add_receiver(ciKlass* receiver, int receiver_count);
duke@435: 
duke@435: public:
duke@435:   // Note:  The following predicates return false for invalid profiles:
never@2949:   bool      has_receiver(int i) const { return _limit > i; }
never@2949:   int       morphism() const          { return _morphism; }
duke@435: 
never@2949:   int       count() const             { return _count; }
duke@435:   int       receiver_count(int i)  {
duke@435:     assert(i < _limit, "out of Call Profile MorphismLimit");
duke@435:     return _receiver_count[i];
duke@435:   }
duke@435:   float     receiver_prob(int i)  {
duke@435:     assert(i < _limit, "out of Call Profile MorphismLimit");
duke@435:     return (float)_receiver_count[i]/(float)_count;
duke@435:   }
duke@435:   ciMethod* method(int i)          {
duke@435:     assert(i < _limit, "out of Call Profile MorphismLimit");
duke@435:     return _method[i];
duke@435:   }
duke@435:   ciKlass*  receiver(int i)        {
duke@435:     assert(i < _limit, "out of Call Profile MorphismLimit");
duke@435:     return _receiver[i];
duke@435:   }
never@3105: 
never@3105:   // Rescale the current profile based on the incoming scale
never@3105:   ciCallProfile rescale(double scale) {
never@3105:     assert(scale >= 0 && scale <= 1.0, "out of range");
never@3105:     ciCallProfile call = *this;
never@3105:     call._count = (int)(call._count * scale);
never@3105:     for (int i = 0; i < _morphism; i++) {
never@3105:       call._receiver_count[i] = (int)(call._receiver_count[i] * scale);
never@3105:     }
never@3105:     return call;
never@3105:   }
duke@435: };
stefank@2314: 
stefank@2314: #endif // SHARE_VM_CI_CICALLPROFILE_HPP