jdk8-mips64-public/hotspot: src/share/vm/ci/ciCallProfile.hpp@b4776199210f

6943485: JVMTI always on capabilities change code generation too much
Reviewed-by: twisti, dcubed

     1 /*

     2  * Copyright 1999-2006 Sun Microsystems, Inc.  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

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 // ciCallProfile

    26 //

    27 // This class is used to determine the frequently called method

    28 // at some call site

    29 class ciCallProfile : StackObj {

    30 private:

    31   // Fields are initialized directly by ciMethod::call_profile_at_bci.

    32   friend class ciMethod;

    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)

    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   }

    51   void add_receiver(ciKlass* receiver, int receiver_count);

    53 public:

    54   // Note:  The following predicates return false for invalid profiles:

    55   bool      has_receiver(int i) { return _limit > i; }

    56   int       morphism()          { return _morphism; }

    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 };

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