1 /*
   2  * Copyright (c) 1998, 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  */
  24 
  25 #include "precompiled.hpp"
  26 #include "oops/oop.inline.hpp"
  27 #include "utilities/histogram.hpp"
  28 
  29 #ifdef ASSERT
  30 
  31 ////////////////// HistogramElement ////////////////////////
  32 
  33 HistogramElement::HistogramElement() {
  34   _count = 0;
  35 }
  36 
  37 int HistogramElement::count() {
  38   return _count;
  39 }
  40 
  41 const char* HistogramElement::name() {
  42   return _name;
  43 }
  44 
  45 void HistogramElement::increment_count() {
  46   // We can't use the accessor :-(.
  47   Atomic::inc(&_count);
  48 }
  49 
  50 int HistogramElement::compare(HistogramElement* e1,HistogramElement* e2) {
  51   if(e1->count() > e2->count()) {
  52     return -1;
  53   } else if(e1->count() < e2->count()) {
  54     return 1;
  55   }
  56   return 0;
  57 }
  58 
  59 void HistogramElement::print_on(outputStream* st) const {
  60   st->print("%10d   ",((HistogramElement*)this)->count());
  61   st->print_cr("%s",((HistogramElement*)this)->name());
  62 }
  63 
  64 ////////////////// Histogram ////////////////////////
  65 
  66 int Histogram::sort_helper(HistogramElement** e1, HistogramElement** e2) {
  67   return (*e1)->compare(*e1,*e2);
  68 }
  69 
  70 Histogram::Histogram(const char* title,int estimatedCount) {
  71   _title = title;
  72   _elements = new (ResourceObj::C_HEAP) GrowableArray<HistogramElement*>(estimatedCount,true);
  73 }
  74 
  75 void Histogram::add_element(HistogramElement* element) {
  76   // Note, we need to add locking !
  77   elements()->append(element);
  78 }
  79 
  80 void Histogram::print_header(outputStream* st) {
  81   st->print_cr("%s",title());
  82   st->print_cr("--------------------------------------------------");
  83 }
  84 
  85 void Histogram::print_elements(outputStream* st) {
  86   elements()->sort(Histogram::sort_helper);
  87   jint total = 0;
  88   for(int i=0; i < elements()->length(); i++) {
  89     elements()->at(i)->print();
  90     total += elements()->at(i)->count();
  91   }
  92   st->print("%10d   ", total);
  93   st->print_cr("Total");
  94 }
  95 
  96 void Histogram::print_on(outputStream* st) const {
  97   ((Histogram*)this)->print_header(st);
  98   ((Histogram*)this)->print_elements(st);
  99 }
 100 
 101 #endif