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annotate graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/SnippetCounter.java @ 21744:d62a384b2415

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improved formatting of snippet counters
author Doug Simon <doug.simon@oracle.com>
date Fri, 05 Jun 2015 11:58:49 +0200
parents bf8cbbfabdcf
children a71b4567d08e
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1 /*
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2 * Copyright (c) 2012, 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
8635406a0c33 factored counter functionality out of CheckcastSnippets in SnippetCounter for use by other snippets
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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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23 package com.oracle.graal.replacements;
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24
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25 //JaCoCo Exclude
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26
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27 import java.io.*;
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28 import java.util.*;
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29
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30 /**
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31 * A counter that can be safely {@linkplain #inc() incremented} from within a snippet for gathering
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32 * snippet specific metrics.
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33 */
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34 public class SnippetCounter implements Comparable<SnippetCounter> {
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35 /**
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36 * A group of related counters.
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37 */
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38 public static class Group {
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39
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40 final String name;
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41 final List<SnippetCounter> counters;
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42
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43 public Group(String name) {
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44 this.name = name;
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45 this.counters = new ArrayList<>();
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46 }
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47
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48 @Override
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49 public synchronized String toString() {
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50 Collections.sort(counters);
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51
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52 long total = 0;
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53 int maxNameLen = 0;
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54 for (SnippetCounter c : counters) {
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55 total += c.value;
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56 maxNameLen = Math.max(c.name.length(), maxNameLen);
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57 }
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58
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59 StringBuilder buf = new StringBuilder(String.format("Counters: %s%n", name));
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60
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61 String formatString = " %" + maxNameLen + "s: %6.2f%%%" + (String.valueOf(total).length() + 2) + "d // %s%n";
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62 for (SnippetCounter c : counters) {
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63 double percent = total == 0D ? 0D : ((double) (c.value * 100)) / total;
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64 buf.append(String.format(formatString, c.name, percent, c.value, c.description));
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65 }
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66 buf.append(String.format(formatString, "TOTAL", 100.0D, total, ""));
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67
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68 return buf.toString();
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69 }
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70 }
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71
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72 /**
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73 * Sorts counters in descending order of their {@linkplain #value() values}.
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74 */
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75 @Override
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76 public int compareTo(SnippetCounter o) {
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77 if (value > o.value) {
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78 return -1;
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79 } else if (o.value < value) {
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80 return 1;
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81 }
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82 return 0;
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83 }
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84
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85 private static final List<Group> groups = new ArrayList<>();
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86
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87 private final Group group;
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88 private final int index;
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89 private final String name;
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90 private final String description;
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91 private long value;
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92
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93 /**
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94 * Creates a counter.
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95 *
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96 * @param group the group to which the counter belongs. If this is null, the newly created
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97 * counter is disabled and {@linkplain #inc() incrementing} is a no-op.
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98 * @param name the name of the counter
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99 * @param description a brief comment describing the metric represented by the counter
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100 */
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101 public SnippetCounter(Group group, String name, String description) {
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102 this.group = group;
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103 this.name = name;
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104 this.description = description;
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105 if (group != null) {
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106 List<SnippetCounter> counters = group.counters;
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107 this.index = counters.size();
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108 counters.add(this);
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109 if (index == 0) {
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110 groups.add(group);
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111 }
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112 } else {
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113 this.index = -1;
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114 }
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115 }
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116
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117 /**
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118 * Increments the value of this counter. This method can be safely used in a snippet if it is
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119 * invoked on a compile-time constant {@link SnippetCounter} object.
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120 */
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121 public void inc() {
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122 if (group != null) {
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123 SnippetCounterNode.increment(this);
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124 }
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125 }
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126
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127 /**
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128 * Gets the value of this counter.
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129 */
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130 public long value() {
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131 return value;
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132 }
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133
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134 @Override
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135 public String toString() {
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136 if (group != null) {
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137 return "SnippetCounter-" + group.name + ":" + name;
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138 }
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139 return super.toString();
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140 }
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141
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142 /**
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143 * Prints all the counter groups to a given stream.
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144 */
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145 public static void printGroups(PrintStream out) {
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146 for (Group group : groups) {
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147 out.println(group);
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148 }
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149 }
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150 }