jdk8-mips64-public/hotspot: src/share/vm/ci/ciCallProfile.hpp@c775af091fe9

8025566: EXCEPTION_ACCESS_VIOLATION in compiled by C1 String.valueOf method
Reviewed-by: kvn

     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

    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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #ifndef SHARE_VM_CI_CICALLPROFILE_HPP

    26 #define SHARE_VM_CI_CICALLPROFILE_HPP

    28 #include "ci/ciClassList.hpp"

    29 #include "memory/allocation.hpp"

    31 // ciCallProfile

    32 //

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

    34 // at some call site

    35 class ciCallProfile : StackObj {

    36 private:

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

    38   friend class ciMethod;

    39   friend class ciMethodHandle;

    41   enum { MorphismLimit = 2 }; // Max call site's morphism we care about

    42   int  _limit;                // number of receivers have been determined

    43   int  _morphism;             // determined call site's morphism

    44   int  _count;                // # times has this call been executed

    45   int  _receiver_count[MorphismLimit + 1]; // # times receivers have been seen

    46   ciMethod* _method[MorphismLimit + 1];    // receivers methods

    47   ciKlass*  _receiver[MorphismLimit + 1];  // receivers (exact)

    49   ciCallProfile() {

    50     _limit = 0;

    51     _morphism    = 0;

    52     _count = -1;

    53     _receiver_count[0] = -1;

    54     _method[0]   = NULL;

    55     _receiver[0] = NULL;

    56   }

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

    60 public:

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

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

    63   int       morphism() const          { return _morphism; }

    65   int       count() const             { return _count; }

    66   int       receiver_count(int i)  {

    67     assert(i < _limit, "out of Call Profile MorphismLimit");

    68     return _receiver_count[i];

    69   }

    70   float     receiver_prob(int i)  {

    71     assert(i < _limit, "out of Call Profile MorphismLimit");

    72     return (float)_receiver_count[i]/(float)_count;

    73   }

    74   ciMethod* method(int i)          {

    75     assert(i < _limit, "out of Call Profile MorphismLimit");

    76     return _method[i];

    77   }

    78   ciKlass*  receiver(int i)        {

    79     assert(i < _limit, "out of Call Profile MorphismLimit");

    80     return _receiver[i];

    81   }

    83   // Rescale the current profile based on the incoming scale

    84   ciCallProfile rescale(double scale) {

    85     assert(scale >= 0 && scale <= 1.0, "out of range");

    86     ciCallProfile call = *this;

    87     call._count = (int)(call._count * scale);

    88     for (int i = 0; i < _morphism; i++) {

    89       call._receiver_count[i] = (int)(call._receiver_count[i] * scale);

    90     }

    91     return call;

    92   }

    93 };

    95 #endif // SHARE_VM_CI_CICALLPROFILE_HPP

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