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annotate graal/com.oracle.truffle.api/src/com/oracle/truffle/api/instrument/TruffleTool.java @ 19038:c7e57dffc5ad

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Truffle/Instrumentation: comments and minor code cleanup post-review
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Thu, 29 Jan 2015 11:44:14 -0800
parents ac114ad31cdd
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1 /*
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2 * Copyright (c) 2015, 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. Oracle designates this
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8 * particular file as subject to the "Classpath" exception as provided
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9 * by Oracle in the LICENSE file that accompanied this code.
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10 *
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11 * This code is distributed in the hope that it will be useful, but WITHOUT
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 * version 2 for more details (a copy is included in the LICENSE file that
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15 * accompanied this code).
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16 *
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17 * You should have received a copy of the GNU General Public License version
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18 * 2 along with this work; if not, write to the Free Software Foundation,
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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20 *
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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22 * or visit www.oracle.com if you need additional information or have any
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23 * questions.
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24 */
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25 package com.oracle.truffle.api.instrument;
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26
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27 /**
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28 * {@linkplain Instrument Instrumentation}-based tools that gather data during Guest Language
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29 * program execution.
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30 * <p>
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31 * Tools share a common <em>life cycle</em>:
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32 * <ul>
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33 * <li>A newly created tool is inert until {@linkplain #install() installed}.</li>
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34 * <li>An installed tool becomes <em>enabled</em> and immediately begins installing
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35 * {@linkplain Instrument instrumentation} on subsequently created ASTs and collecting data from
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36 * those instruments</li>
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37 * <li>A tool may only be installed once.</li>
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38 * <li>It should be possible to install multiple instances of a tool, possibly (but not necessarily)
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39 * configured differently with respect to what data is being collected.</li>
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40 * <li>Once installed, a tool can be {@linkplain #setEnabled(boolean) enabled and disabled}
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41 * arbitrarily.</li>
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42 * <li>A disabled tool:
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43 * <ul>
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44 * <li>Collects no data;</li>
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45 * <li>Retains existing AST instrumentation;</li>
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46 * <li>Continues to instrument newly created ASTs; and</li>
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47 * <li>Retains previously collected data.</li>
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48 * </ul>
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49 * </li>
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50 * <li>An installed tool may be {@linkplain #reset() reset} at any time, which leaves the tool
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51 * installed but with all previously collected data removed.</li>
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52 * <li>A {@linkplain #dispose() disposed} tool removes all instrumentation (but not
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53 * {@linkplain Probe probes}) and becomes permanently disabled; previously collected data persists.</li>
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54 * </ul>
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55 * <p>
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56 * Tool-specific methods that access data collected by the tool should:
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57 * <ul>
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58 * <li>Return modification-safe representations of the data; and</li>
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59 * <li>Not change the state of the data.</li>
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60 * </ul>
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61 * <b>Note:</b><br>
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62 * Tool installation is currently <em>global</em> to the Truffle Execution environment. When
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63 * language-agnostic management of individual execution environments is added to the platform,
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64 * installation will be (optionally) specific to a single execution environment.
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65 */
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66 public abstract class TruffleTool {
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67
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68 private enum ToolState {
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69
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70 /** Not yet installed, inert. */
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71 UNINSTALLED,
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72
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73 /** Installed, collecting data. */
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74 ENABLED,
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75
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76 /** Installed, not collecting data. */
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77 DISABLED,
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78
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79 /** Was installed, but now removed, inactive, and no longer usable. */
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80 DISPOSED;
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81 }
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82
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83 private ToolState toolState = ToolState.UNINSTALLED;
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84
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85 protected TruffleTool() {
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86 }
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87
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88 /**
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89 * Connect the tool to some part of the Truffle runtime, and enable data collection to start.
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90 * Instrumentation will only be added to subsequently created ASTs.
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91 *
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92 * @throws IllegalStateException if the tool has previously been installed.
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93 */
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94 public final void install() {
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95 checkUninstalled();
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96 if (internalInstall()) {
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97 toolState = ToolState.ENABLED;
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98 }
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99 }
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100
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101 /**
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102 * @return whether the tool is currently collecting data.
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103 */
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104 public final boolean isEnabled() {
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105 return toolState == ToolState.ENABLED;
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106 }
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107
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108 /**
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109 * Switches tool state between <em>enabled</em> (collecting data) and <em>disabled</em> (not
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110 * collecting data, but keeping data already collected).
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111 *
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112 * @throws IllegalStateException if not yet installed or disposed.
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113 */
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114 public final void setEnabled(boolean isEnabled) {
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115 checkInstalled();
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116 internalSetEnabled(isEnabled);
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117 toolState = isEnabled ? ToolState.ENABLED : ToolState.DISABLED;
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118 }
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119
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120 /**
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121 * Clears any data already collected, but otherwise does not change the state of the tool.
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122 *
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123 * @throws IllegalStateException if not yet installed or disposed.
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124 */
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125 public final void reset() {
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126 checkInstalled();
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127 internalReset();
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128 }
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129
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130 /**
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131 * Makes the tool permanently <em>disabled</em>, removes instrumentation, but keeps data already
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132 * collected.
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133 *
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134 * @throws IllegalStateException if not yet installed or disposed.
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135 */
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136 public final void dispose() {
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137 checkInstalled();
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138 internalDispose();
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139 toolState = ToolState.DISPOSED;
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140 }
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141
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142 /**
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143 * @return whether the installation succeeded.
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144 */
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145 protected abstract boolean internalInstall();
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146
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147 /**
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148 * No subclass action required.
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149 *
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150 * @param isEnabled
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151 */
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152 protected void internalSetEnabled(boolean isEnabled) {
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153 }
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154
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155 protected abstract void internalReset();
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156
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157 protected abstract void internalDispose();
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158
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159 /**
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160 * Ensure that the tool is currently installed.
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161 *
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162 * @throws IllegalStateException
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163 */
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164 private void checkInstalled() throws IllegalStateException {
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165 if (toolState == ToolState.UNINSTALLED) {
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166 throw new IllegalStateException("Tool " + getClass().getSimpleName() + " not yet installed");
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167 }
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168 if (toolState == ToolState.DISPOSED) {
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169 throw new IllegalStateException("Tool " + getClass().getSimpleName() + " has been disposed");
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170 }
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171 }
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172
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173 /**
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174 * Ensure that the tool has not yet been installed.
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175 *
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176 * @throws IllegalStateException
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177 */
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178 private void checkUninstalled() {
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179 if (toolState != ToolState.UNINSTALLED) {
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180 throw new IllegalStateException("Tool " + getClass().getSimpleName() + " has already been installed");
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181 }
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182 }
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183
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184 }