Mercurial > hg > truffle
annotate graal/com.oracle.max.base/src/com/sun/max/program/Trace.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
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children | bc8527f3071c |
rev | line source |
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1 /* |
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2 * Copyright (c) 2007, 2011, 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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23 package com.sun.max.program; |
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24 |
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25 import java.io.*; |
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26 |
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27 import com.sun.max.annotate.*; |
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28 import com.sun.max.io.*; |
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29 import com.sun.max.program.option.*; |
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30 |
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31 /** |
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32 * Tracing output for debugging purposes. No performance impact when disabled. Some performance impact when active, even |
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33 * without output. Possibly significant performance impact when producing a lot of output. |
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34 */ |
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35 public final class Trace { |
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36 |
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37 private Trace() { |
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38 // do nothing. |
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39 } |
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40 |
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41 private static PrintStream stream; |
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42 |
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43 public static PrintStream stream() { |
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44 return stream; |
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45 } |
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46 |
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47 public static void setStream(PrintStream stream) { |
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48 Trace.stream = stream; |
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49 } |
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50 |
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51 private static final boolean showThread; |
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52 |
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53 static { |
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54 showThread = System.getProperty("max.trace.showThread") != null; |
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55 final String traceFileName = System.getProperty("max.trace.file"); |
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56 stream = System.out; |
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57 if (traceFileName != null) { |
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58 final File traceFile = new File(traceFileName); |
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59 try { |
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60 final OutputStream fileStream = new BufferedOutputStream(new FileOutputStream(traceFile)); |
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61 if (System.getProperty("max.trace.noconsole") != null) { |
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62 stream = new PrintStream(fileStream); |
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63 } else { |
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64 stream = new PrintStream(new MultiOutputStream(fileStream, System.out)); |
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65 } |
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66 } catch (IOException ioException) { |
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67 System.err.println("Could not open file for trace output: " + traceFile.getAbsolutePath()); |
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68 } |
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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 * Static master switch. Set by source code editing only (for now). |
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74 * |
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75 * Set '_enabled' to 'true' to enable tracing output, according to your other trace-related settings. |
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76 * |
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77 * Set '_enabled' to 'false' to prevent any tracing. All tracing routines will thus become dead code. The optimizing |
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78 * compiler should then be able to eliminate the runtime overhead. |
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79 */ |
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80 private static final boolean ENABLED = true; |
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81 |
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82 public static void addTo(OptionSet options) { |
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83 options.addOption(new Option<Integer>("trace", 0, OptionTypes.INT_TYPE, "Sets tracing level.") { |
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84 @Override |
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85 public void setValue(Integer value) { |
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86 super.setValue(value); |
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87 level = value; |
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88 } |
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89 }); |
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90 } |
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91 |
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92 /** |
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93 * Dynamically sets tracing level, causing trace commands at this or lower levels to produce output. |
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94 */ |
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95 public static void on(int newLevel) { |
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96 assert newLevel >= 0; |
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97 level = newLevel; |
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98 } |
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99 |
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100 /** |
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101 * Dynamically turns tracing on for all levels. |
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102 */ |
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103 public static void on() { |
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104 on(Integer.MAX_VALUE); |
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105 } |
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106 |
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107 @RESET |
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108 private static long count; |
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109 |
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110 /** |
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111 * The threshold of trace calls before traces are actually sent to the trace stream. |
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112 * |
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113 * This field can be updated by the inspector. |
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114 */ |
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115 @RESET |
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116 @INSPECTED |
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117 private static long threshold; |
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118 |
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119 /** |
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120 * The current trace level. |
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121 * |
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122 * This field can be updated by the inspector. |
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123 */ |
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124 @RESET |
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125 @INSPECTED |
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126 private static int level; |
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127 |
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128 /** |
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129 * Dynamically sets the current tracing level to the greater of the current level or the specified new level. |
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130 */ |
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parents:
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131 public static void atLeast(int l) { |
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132 if (l > level) { |
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133 level = l; |
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parents:
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134 } |
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parents:
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135 } |
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136 |
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137 /** |
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138 * Dynamically turns tracing off by setting current level to zero. |
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parents:
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139 */ |
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parents:
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140 public static void off() { |
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parents:
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141 level = 0; |
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parents:
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142 } |
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143 |
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parents:
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144 /** |
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145 * @return current tracing level, which must equal or exceed the level specified by trace commands for output to be produced. |
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parents:
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|
146 */ |
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parents:
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147 public static int level() { |
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148 return level; |
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parents:
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149 } |
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150 |
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151 /** |
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152 * Does the current tracing level equal or exceed the specified level. |
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153 */ |
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154 public static boolean hasLevel(int requiredLevel) { |
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155 count++; |
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156 return level >= requiredLevel && count >= threshold; |
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157 } |
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158 |
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159 private static final int MAX_INDENTATION = 10; |
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160 |
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parents:
diff
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161 @RESET |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
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162 private static int indentation; |
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163 |
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164 private static void printInt(int n) { |
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165 if (n < 10) { |
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parents:
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|
166 stream.write(((char) n) + '0'); |
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|
167 } else { |
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parents:
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|
168 final int m = n / 10; |
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169 printInt(m); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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|
170 printInt(n - (m * 10)); |
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parents:
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|
171 } |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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|
172 } |
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173 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
174 /** |
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|
175 * This should not cause allocation/GC. |
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|
176 */ |
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|
177 private static void printPrefix(int requiredLevel) { |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
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|
178 if (showThread) { |
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parents:
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|
179 stream.print(Thread.currentThread().getName() + " <Trace"); |
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180 } else { |
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parents:
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|
181 stream.print("<Trace "); |
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parents:
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|
182 } |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
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|
183 printInt(requiredLevel); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
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|
184 stream.print("> "); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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changeset
|
185 for (int i = 0; i < indentation; i++) { |
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|
186 stream.print(" "); |
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parents:
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|
187 } |
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parents:
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188 } |
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|
189 |
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parents:
diff
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|
190 /** |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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|
191 * Prints a newline on trace output if tracing is globally enabled and current tracing level is at least the level required. |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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|
192 */ |
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|
193 public static void line(int requiredLevel) { |
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194 if (ENABLED) { |
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|
195 if (hasLevel(requiredLevel)) { |
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196 stream.println(); |
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197 stream.flush(); |
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parents:
diff
changeset
|
198 } |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
199 } |
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parents:
diff
changeset
|
200 } |
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201 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
202 /** |
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changeset
|
203 * Prints a line of trace output if tracing is globally enabled and if current tracing level is at least the level required. |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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changeset
|
204 */ |
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parents:
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changeset
|
205 public static void line(int requiredLevel, Object message) { |
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parents:
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changeset
|
206 if (ENABLED) { |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
207 if (hasLevel(requiredLevel)) { |
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changeset
|
208 printPrefix(requiredLevel); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
209 stream.println(message); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
210 stream.flush(); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
211 } |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
212 } |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
213 } |
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|
214 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
215 /** |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
216 * Prints a "BEGIN" line of trace output if tracing is globally enabled and if current tracing level is at least the level required; increases indentation. |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
217 */ |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
218 public static void begin(int requiredLevel, Object message) { |
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|
219 if (ENABLED) { |
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changeset
|
220 if (hasLevel(requiredLevel)) { |
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parents:
diff
changeset
|
221 printPrefix(requiredLevel); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
222 stream.print("BEGIN: "); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
223 stream.println(message); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
224 stream.flush(); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
225 indentation++; |
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parents:
diff
changeset
|
226 } |
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parents:
diff
changeset
|
227 } |
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parents:
diff
changeset
|
228 } |
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|
229 |
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parents:
diff
changeset
|
230 /** |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
231 * Prints an "END" line of trace output if tracing is globally enabled and if current tracing level is at least the level required; decreases indentation. |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
232 */ |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
233 public static void end(int requiredLevel, Object message) { |
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diff
changeset
|
234 end(requiredLevel, message, 0); |
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parents:
diff
changeset
|
235 } |
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parents:
diff
changeset
|
236 |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
237 /** |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
238 * Prints an "END" line of trace output if tracing is globally enabled and if current tracing level is at least the level required; decreases indentation; |
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parents:
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|
239 * appends a timing message, expressed in milliseconds, if a non-zero starting time is supplied. |
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parents:
diff
changeset
|
240 * @param requiredLevel |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
241 * @param message |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
242 * @param startTimeMillis a starting time, output from {@link System#currentTimeMillis()}; no timing message appears if zero. |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
243 */ |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
244 public static void end(int requiredLevel, Object message, long startTimeMillis) { |
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diff
changeset
|
245 if (ENABLED) { |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
246 if (hasLevel(requiredLevel)) { |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
247 final long endTimeMillis = System.currentTimeMillis(); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
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|
248 indentation--; |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
249 // It's quite possible for indentation to go negative in a multithreaded environment |
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diff
changeset
|
250 //assert _indentation >= 0; |
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parents:
diff
changeset
|
251 printPrefix(requiredLevel); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
252 stream.print("END: "); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
253 if (startTimeMillis > 0) { |
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parents:
diff
changeset
|
254 stream.print(message); |
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Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
diff
changeset
|
255 stream.print(" ("); |
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256 stream.print(endTimeMillis - startTimeMillis); |
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257 stream.println("ms)"); |
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258 } else { |
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259 stream.println(message); |
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260 stream.flush(); |
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261 } |
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262 } |
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263 } |
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264 } |
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265 } |