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annotate graal/com.oracle.jvmci.debug/src/com/oracle/jvmci/debug/internal/DebugHistogramAsciiPrinter.java @ 21794:483b357016a6

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Use export target explicitly in mx_graal.py when building JDK (JBS:GRAAL-52)
author Stefan Anzinger <stefan.anzinger@oracle.com>
date Mon, 08 Jun 2015 20:30:39 +0200
parents b1530a6cce8c
children
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63b4694d3627 split DebugHistogram printing out into separate service
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1 /*
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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b1530a6cce8c renamed com.oracle.graal.[debug|options|hotspotvmconfig]* modules to com.oracle.jvmci.[debug|options|hotspotvmconfig]* modules (JBS:GRAAL-53)
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23 package com.oracle.jvmci.debug.internal;
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24
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25 import java.io.*;
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26 import java.util.*;
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27
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28 import com.oracle.jvmci.debug.*;
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29 import com.oracle.jvmci.debug.DebugHistogram.CountedValue;
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30 import com.oracle.jvmci.debug.DebugHistogram.Printer;
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31
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32 /**
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33 * Renders a textual representation of a histogram to a given print stream.
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34 */
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35 public class DebugHistogramAsciiPrinter implements Printer {
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36
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37 public static final int NumberSize = 10;
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38 public static final int DefaultNameSize = 50;
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39 public static final int DefaultBarSize = 100;
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40 public static final int DefaultScale = 1;
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41
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42 private final PrintStream os;
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43 private final int limit;
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44 private final int nameSize;
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45 private final int barSize;
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46 private final int scale;
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47
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48 public DebugHistogramAsciiPrinter(PrintStream os) {
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49 this(os, Integer.MAX_VALUE, DefaultNameSize, DefaultBarSize, DefaultScale);
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50 }
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51
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52 /**
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53 * @param os where to print
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54 * @param limit limits printing to the {@code limit} most frequent values
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55 * @param nameSize the width of the value names column
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56 * @param barSize the width of the value frequency column
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57 * @param scale a factor by which every result is divided
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58 */
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59 public DebugHistogramAsciiPrinter(PrintStream os, int limit, int nameSize, int barSize, int scale) {
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60 this.os = os;
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61 this.limit = limit;
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62 this.nameSize = nameSize;
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63 this.barSize = barSize;
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64 this.scale = scale;
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65 }
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66
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67 public void print(DebugHistogram histogram) {
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68 List<CountedValue> list = histogram.getValues();
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69 if (list.isEmpty()) {
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70 os.printf("%s is empty.%n", histogram.getName());
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71 return;
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72 }
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73
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74 // Sum up the total number of elements.
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75 long total = list.stream().mapToLong(CountedValue::getCount).sum();
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76
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77 // Print header.
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78 os.printf("%s has %d unique elements and %d total elements:%n", histogram.getName(), list.size(), total / scale);
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79
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80 long max = list.get(0).getCount() / scale;
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81 final int lineSize = nameSize + NumberSize + barSize + 10;
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82 printLine(os, '-', lineSize);
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83 String formatString = "| %-" + nameSize + "s | %-" + NumberSize + "d | %-" + barSize + "s |\n";
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84 for (int i = 0; i < list.size() && i < limit; ++i) {
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85 CountedValue cv = list.get(i);
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86 long value = cv.getCount() / scale;
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87 char[] bar = new char[(int) (((double) value / (double) max) * barSize)];
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88 Arrays.fill(bar, '=');
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89 String objectString = String.valueOf(cv.getValue());
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90 if (objectString.length() > nameSize) {
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91 objectString = objectString.substring(0, nameSize - 3) + "...";
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92 }
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93 os.printf(formatString, objectString, value, new String(bar));
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94 }
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95 printLine(os, '-', lineSize);
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96 }
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97
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98 private static void printLine(PrintStream printStream, char c, int lineSize) {
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99 char[] charArr = new char[lineSize];
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100 Arrays.fill(charArr, c);
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101 printStream.printf("%s%n", new String(charArr));
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102 }
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103 }