jdk8-mips64-public/hotspot: src/share/vm/utilities/histogram.hpp@0fbdb4381b99

6814575: Update copyright year
Summary: Update copyright for files that have been modified in 2009, up to 03/09
Reviewed-by: katleman, tbell, ohair

     1 /*

     2  * Copyright 1998-2000 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 // This class provides a framework for collecting various statistics.

    26 // The current implementation is oriented towards counting invocations

    27 // of various types, but that can be easily changed.

    28 //

    29 // To use it, you need to declare a Histogram*, and a subtype of

    30 // HistogramElement:

    31 //

    32 //  HistogramElement* MyHistogram;

    33 //

    34 //  class MyHistogramElement : public HistogramElement {

    35 //    public:

    36 //      MyHistogramElement(char* name);

    37 //  };

    38 //

    39 //  MyHistogramElement::MyHistogramElement(char* elementName) {

    40 //    _name = elementName;

    41 //

    42 //    if(MyHistogram == NULL)

    43 //      MyHistogram = new Histogram("My Call Counts",100);

    44 //

    45 //    MyHistogram->add_element(this);

    46 //  }

    47 //

    48 //  #define MyCountWrapper(arg) static MyHistogramElement* e = new MyHistogramElement(arg); e->increment_count()

    49 //

    50 // This gives you a simple way to count invocations of specfic functions:

    51 //

    52 // void a_function_that_is_being_counted() {

    53 //   MyCountWrapper("FunctionName");

    54 //   ...

    55 // }

    56 //

    57 // To print the results, invoke print() on your Histogram*.

    59 #ifdef ASSERT

    61 class HistogramElement : public CHeapObj {

    62  protected:

    63   jint _count;

    64   const char* _name;

    66  public:

    67   HistogramElement();

    68   virtual int count();

    69   virtual const char* name();

    70   virtual void increment_count();

    71   void print_on(outputStream* st) const;

    72   virtual int compare(HistogramElement* e1,HistogramElement* e2);

    73 };

    75 class Histogram : public CHeapObj {

    76  protected:

    77   GrowableArray<HistogramElement*>* _elements;

    78   GrowableArray<HistogramElement*>* elements() { return _elements; }

    79   const char* _title;

    80   const char* title() { return _title; }

    81   static int sort_helper(HistogramElement** e1,HistogramElement** e2);

    82   virtual void print_header(outputStream* st);

    83   virtual void print_elements(outputStream* st);

    85  public:

    86   Histogram(const char* title,int estimatedSize);

    87   virtual void add_element(HistogramElement* element);

    88   void print_on(outputStream* st) const;

    89 };

    91 #endif

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