aoqi@0: /*
aoqi@0:  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #ifndef SHARE_VM_CI_CICALLPROFILE_HPP
aoqi@0: #define SHARE_VM_CI_CICALLPROFILE_HPP
aoqi@0: 
aoqi@0: #include "ci/ciClassList.hpp"
aoqi@0: #include "memory/allocation.hpp"
aoqi@0: 
aoqi@0: // ciCallProfile
aoqi@0: //
aoqi@0: // This class is used to determine the frequently called method
aoqi@0: // at some call site
aoqi@0: class ciCallProfile : StackObj {
aoqi@0: private:
aoqi@0:   // Fields are initialized directly by ciMethod::call_profile_at_bci.
aoqi@0:   friend class ciMethod;
aoqi@0:   friend class ciMethodHandle;
aoqi@0: 
aoqi@0:   enum { MorphismLimit = 2 }; // Max call site's morphism we care about
aoqi@0:   int  _limit;                // number of receivers have been determined
aoqi@0:   int  _morphism;             // determined call site's morphism
aoqi@0:   int  _count;                // # times has this call been executed
aoqi@0:   int  _receiver_count[MorphismLimit + 1]; // # times receivers have been seen
aoqi@0:   ciMethod* _method[MorphismLimit + 1];    // receivers methods
aoqi@0:   ciKlass*  _receiver[MorphismLimit + 1];  // receivers (exact)
aoqi@0: 
aoqi@0:   ciCallProfile() {
aoqi@0:     _limit = 0;
aoqi@0:     _morphism    = 0;
aoqi@0:     _count = -1;
aoqi@0:     _receiver_count[0] = -1;
aoqi@0:     _method[0]   = NULL;
aoqi@0:     _receiver[0] = NULL;
aoqi@0:   }
aoqi@0: 
aoqi@0:   void add_receiver(ciKlass* receiver, int receiver_count);
aoqi@0: 
aoqi@0: public:
aoqi@0:   // Note:  The following predicates return false for invalid profiles:
aoqi@0:   bool      has_receiver(int i) const { return _limit > i; }
aoqi@0:   int       morphism() const          { return _morphism; }
aoqi@0: 
aoqi@0:   int       count() const             { return _count; }
aoqi@0:   int       receiver_count(int i)  {
aoqi@0:     assert(i < _limit, "out of Call Profile MorphismLimit");
aoqi@0:     return _receiver_count[i];
aoqi@0:   }
aoqi@0:   float     receiver_prob(int i)  {
aoqi@0:     assert(i < _limit, "out of Call Profile MorphismLimit");
aoqi@0:     return (float)_receiver_count[i]/(float)_count;
aoqi@0:   }
aoqi@0:   ciMethod* method(int i)          {
aoqi@0:     assert(i < _limit, "out of Call Profile MorphismLimit");
aoqi@0:     return _method[i];
aoqi@0:   }
aoqi@0:   ciKlass*  receiver(int i)        {
aoqi@0:     assert(i < _limit, "out of Call Profile MorphismLimit");
aoqi@0:     return _receiver[i];
aoqi@0:   }
aoqi@0: 
aoqi@0:   // Rescale the current profile based on the incoming scale
aoqi@0:   ciCallProfile rescale(double scale) {
aoqi@0:     assert(scale >= 0 && scale <= 1.0, "out of range");
aoqi@0:     ciCallProfile call = *this;
aoqi@0:     call._count = (int)(call._count * scale);
aoqi@0:     for (int i = 0; i < _morphism; i++) {
aoqi@0:       call._receiver_count[i] = (int)(call._receiver_count[i] * scale);
aoqi@0:     }
aoqi@0:     return call;
aoqi@0:   }
aoqi@0: };
aoqi@0: 
aoqi@0: #endif // SHARE_VM_CI_CICALLPROFILE_HPP