jdk8-mips64-public/hotspot: src/share/vm/utilities/histogram.hpp@e5003079dfa5

     1 /*

     2  * Copyright (c) 1998, 2012, 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_UTILITIES_HISTOGRAM_HPP

    26 #define SHARE_VM_UTILITIES_HISTOGRAM_HPP

    28 #include "memory/allocation.hpp"

    29 #include "runtime/os.hpp"

    30 #include "utilities/growableArray.hpp"

    31 #ifdef TARGET_OS_FAMILY_linux

    32 # include "os_linux.inline.hpp"

    33 #endif

    34 #ifdef TARGET_OS_FAMILY_solaris

    35 # include "os_solaris.inline.hpp"

    36 #endif

    37 #ifdef TARGET_OS_FAMILY_windows

    38 # include "os_windows.inline.hpp"

    39 #endif

    40 #ifdef TARGET_OS_FAMILY_bsd

    41 # include "os_bsd.inline.hpp"

    42 #endif

    44 // This class provides a framework for collecting various statistics.

    45 // The current implementation is oriented towards counting invocations

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

    47 //

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

    49 // HistogramElement:

    50 //

    51 //  HistogramElement* MyHistogram;

    52 //

    53 //  class MyHistogramElement : public HistogramElement {

    54 //    public:

    55 //      MyHistogramElement(char* name);

    56 //  };

    57 //

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

    59 //    _name = elementName;

    60 //

    61 //    if(MyHistogram == NULL)

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

    63 //

    64 //    MyHistogram->add_element(this);

    65 //  }

    66 //

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

    68 //

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

    70 //

    71 // void a_function_that_is_being_counted() {

    72 //   MyCountWrapper("FunctionName");

    73 //   ...

    74 // }

    75 //

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

    78 #ifdef ASSERT

    80 class HistogramElement : public CHeapObj<mtInternal> {

    81  protected:

    82   jint _count;

    83   const char* _name;

    85  public:

    86   HistogramElement();

    87   virtual int count();

    88   virtual const char* name();

    89   virtual void increment_count();

    90   void print_on(outputStream* st) const;

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

    92 };

    94 class Histogram : public CHeapObj<mtInternal> {

    95  protected:

    96   GrowableArray<HistogramElement*>* _elements;

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

    98   const char* _title;

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

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

   101   virtual void print_header(outputStream* st);

   102   virtual void print_elements(outputStream* st);

   104  public:

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

   106   virtual void add_element(HistogramElement* element);

   107   void print_on(outputStream* st) const;

   108 };

   110 #endif

   112 #endif // SHARE_VM_UTILITIES_HISTOGRAM_HPP

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