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1 <html>
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2 <head>
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3 <title>
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4 JavaScript interface to Hotspot Serviceability Agent
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5 </title>
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6 </head>
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7 <body>
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8 <h1>JavaScript interface to Hotspot Serviceability Agent</h1>
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9
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10 <p>
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11 Serviceability Agent (SA) provides Java API and tools to diagnose HotSpot Virtual Machine and
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12 Java apps running on it. SA is a snapshot debugger -- can be used to observe state of a frozen java process or java core dump.
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13 </p>
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14
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15 <h2>Existing SA APIs</h2>
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16 <p>
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17 There are two application programmer interfaces (APIs) for SA:
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18 <dl>
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19 <dt>1. Private java API
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20 </dt>
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21 <dd>
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22 This tries to mimic hotspot VM's internal C++ classes and methods. Because VM data structures
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23 are a moving target, this API can never be 'stable'! Besides, to use SA's private API knowledge of
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24 HotSpot code base is essential.
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25 </dd>
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26 <dt>2. SA-JDI -- Java Debugger Interface read-only subset API
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27 </dt>
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28 <dd>
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29 This is read-only subset of JDI (Java Debugger Interface)
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30 This is a standardized interface to get java level state of a java process or java core dump. While this
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31 interface is useful, this misses parts of java level state from target process or core such as
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32 <ul>
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33 <li>heap walking interface -- only objects traceable to static variables (of classes) and local
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34 variables of stack frames can be accessed.
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35 <li>re-constructing .class from debuggee are missing.
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36 <li>re-constructing object mirrors for Java objects of the debuggee.
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37 </ul>
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38 </dd>
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39 </dl>
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40 </p>
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41
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42 <h2>SA Scripting interface</h2>
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43
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44 <p>
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45 Traditionally, platform debuggers such as dbx, gdb and Solaris mdb (Module Debugger), provide a scripting
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46 language interface. Scripting language interface provides easy-to-use, dynamically typed
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47 interface to access data structures from debuggee. dbx and mdb even allow user to write
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48 C/C++ modules to extend the scripting language commands.
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49 </p>
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50
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51 <p>
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52 SA provides SOQL - Simple Object Query Language -- a SQL-like query language to access
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53 Java heap as an object database. SA's main GUI (HSDB) also exposes scripting interface of underlying debugger such as dbx, windbg.
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54 But to use this interface, user has to learn scripting interface of multiple debugger back-ends such as dbx, windbg.
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55 And these scripting interfaces are 'raw' in the sense that no java state is exposed -- only C/C++ state of VM is exposed.
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56 Higher level SA services are not available through scripting interface.
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57 </p>
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58
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59 <p>
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60 <b>jsdb -- JavaScript Debugger</b> attempts to provide JavaScript interface to SA.
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61 jsdb provides
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62
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63 <ul>
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64 <li>high-level hotspot (and SA) independent scripting interface
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65 <li>low-level SA-aware scripting interface.
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66 </ul>
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67 </p>
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68
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69 <h2>High level interface (Java State)</h2>
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70
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71 <b>jsdb</b> is a command line <a href="http://www.ecma-international.org/publications/standards/Ecma-262.htm">JavaScript</a> shell based on
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72 <a href="http://www.mozilla.org/rhino/">Mozilla's Rhino JavaScript Engine</a>.
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73 This command line utility attaches to Java process or core file or remote debug server and waits for user input.
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74 This shell supports the following global functions and objects in addition to the standard JavaScript functions and
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75 objects:
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76
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77 <h3>jdsb globals</h3>
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78
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79 <table border="1">
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80 <tr>
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81 <th>Function/Variable</th>
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82 <th>Description</th>
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83 </tr>
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84 <tr>
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85 <td>
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86 address(jobject)
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87 </td>
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88 <td>
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89 function that returns the address of the Java object as a string
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90 </td>
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91 </tr>
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92 <td>
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93 classof(jobject)
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94 </td>
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95 <td>
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96 function that returns the JavaScript object that represents class object of the Java object
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97 </td>
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98 </tr>
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99 <td>
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100 dumpClass(jclass,[dir])
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101 </td>
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102 <td>
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103 function that writes .class for the given Java Class. Optionally (second arg) accepts the directory where the
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104 .class has to be written.
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105 </td>
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106 </tr>
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107 <td>
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108 help()
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109 </td>
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110 <td>
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111 function that prints help message for global functions and objects
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112 </td>
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113 </tr>
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114 <tr>
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115 <td>
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116 identityHash(jobject)
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117 </td>
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118 <td>
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119 function that returns the identity hashCode of the Java object
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120 </td>
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121 </tr>
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122 <tr>
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123 <td>
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124 mirror(jobject)
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125 </td>
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126 <td>
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127 function that returns a local mirror of the Java object.
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128 </td>
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129 </tr>
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130 <tr>
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131 <td>
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132 load([file1, file2,...])
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133 </td>
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134 <td>
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135 function that loads zero or more JavaScript file(s). With no arguments, reads <stdin> for
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136 JavaScript code.
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137 </td>
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138 </tr>
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139 <tr>
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140 <td>
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141 object(string)
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142 </td>
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143 <td>
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144 function that converts a string address into Java object
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145 </td>
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146 </tr>
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147 <tr>
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148 <td>
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149 owner(jobject)
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150 </td>
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151 <td>
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152 function that returns the owner thread of this monitor or null
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153 </td>
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154 </tr>
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155 <tr>
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156 <td>
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157 sizeof(jobject)
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158 </td>
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159 <td>
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160 function that returns the size of Java object in bytes
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161 </td>
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162 </tr>
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163 <tr>
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164 <td>
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165 staticof(jclass, field)
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166 </td>
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167 <td>
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168 function that returns the value of given field of the given Java class
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169 </td>
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170 </tr>
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171 <tr>
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172 <td>
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173 print(expr1, expr2,...)
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174 </td>
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175 <td>
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176 function that prints zero or more JavaScript expressions after converting those as strings
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177 </td>
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178 </tr>
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179 <tr>
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180 <td>
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181 println(expr1, expr2..)
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182 </td>
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183 <td>
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184 function that same as print, but prints a newline at the end
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185 </td>
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186 </tr>
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187 <tr>
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188 <td>
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189 read([prompt])
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190 </td>
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191 <td>
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192 function that reads a single line from standard input
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193 </td>
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194 </tr>
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195 <tr>
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196 <td>
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197 quit()
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198 </td>
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199 <td>
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200 function that quits the interactive load call as well as the shell
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201 </td>
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202 </tr>
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203 <tr>
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204 <td>
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205 jvm
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206 </td>
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207 <td>
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208 variable -- a JavaScript object that represents the target jvm that is being debugged
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209 </td>
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210 </tr>
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211 </table>
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212
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213 <h3>jvm object</h3>
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214
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215 <p>
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216 jvm object supports the following read-only properties.
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217 </p>
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218
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219 <table border="1">
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220 <tr>
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221 <th>
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222 Property name
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223 </th>
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224 <th>
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225 Description
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226 </th>
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227 </tr>
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228 <tr>
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229 <td>
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230 threads
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231 </td>
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232 <td>
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233 array of Java threads from the debuggee
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234 </td>
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235 </tr>
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236 <tr>
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237 <td>
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238 heap
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239 </td>
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240 <td>
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241 object representing the heap of the debuggee
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242 </td>
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243 </tr>
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244 <tr>
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245 <td>
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246 type
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247 </td>
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248 <td>
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249 string value that is either "Server" or "Client" or "Core" -- the flavour of debuggee VM
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250 </td>
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251 </tr>
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252 <tr>
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253 <td>
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254 bootClassPath
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255 </td>
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256 <td>
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257 string value of bootclasspath of the debuggee
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258 </td>
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259 </tr>
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260 <tr>
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261 <td>
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262 cpu
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263 </td>
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264 <td>
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265 string value of cpu on which the debuggee runs/ran
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266 </td>
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267 </tr>
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268 <tr>
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269 <td>
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270 sysProps
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271 </td>
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272 <td>
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273 name-value pairs (JavaScript associative array) of Java System properties of the debuggee
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274 </td>
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275 </tr>
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276 <tr>
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277 <td>
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278 addressSize
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279 </td>
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280 <td>
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281 int value -- 32 for 32 bit debuggee, 64 for 64 bit debuggee
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282 </td>
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283 </tr>
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284 <tr>
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285 <td>
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286 os
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287 </td>
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288 <td>
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289 string value of OS on which the debuggee runs/ran
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290 </td>
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291 </tr>
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292 <tr>
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293 <td>
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294 buildInfo
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295 </td>
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296 <td>
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297 internal build info string from debuggee
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298 </td>
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299 </tr>
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300 <tr>
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301 <td>
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302 flags
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303 </td>
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304 <td>
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305 name-value pairs (JavaScript associative array) of JVM command line flags of the debuggee
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306 </td>
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307 </tr>
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308 <tr>
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309 <td>
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310 classPath
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311 </td>
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312 <td>
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313 string value of classpath of the debuggee
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314 </td>
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315 </tr>
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316 <tr>
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317 <td>
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318 userDir
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319 </td>
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320 <td>
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321 string value of user.dir System property of the debuggee
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322 </td>
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323 </tr>
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324 </table>
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325
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326 <h3>heap object</h3>
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327
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328 <p>
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329 heap object represents Java heap of the debuggee VM
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330 </p>
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331 <table border="1">
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332 <tr>
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333 <th>
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334 Function or property name
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335 </th>
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336 <th>
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337 Description
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338 </th>
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339 </tr>
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340 <tr>
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341 <td>
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342 capacity
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343 </td>
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344 <td>
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345 byte size of capacity of the heap
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346 </td>
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347 </tr>
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348 <tr>
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349 <td>
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350 used
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351 </td>
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352 <td>
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353 byte size of used portion (of live objects) of the heap
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354 </td>
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355 </tr>
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356 <tr>
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357 <td>
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358 forEachObject(func, [class], [include subtypes -- true|false])
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359 </td>
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360 <td>
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361 This function accepts a callback function 'func' and optionally class name and boolean arguments.
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362 This function calls the callback for each Java object in the debuggee's heap. The optional class
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363 argument may be used to receive objects of given class only. The third arguments specifies whether
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364 to include objects of subtype of given class [or interface] or not. The default value of class is "java.lang.Object"
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365 and and that of the third argument is true. i.e., by default all objects are included.
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366 </td>
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367 </tr>
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368 <tr>
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369 <td>
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370 forEachClass(func, [initiating loader -- true|false])
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371 </td>
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372 <td>
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373 This function accepts a callback function 'func'. This function iterates through the classes of the debuggee and calls the
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374 callback for each class. The second parameter tells whether to pass initiating loader to the iterator callback or not.
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375 </td>
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376 </tr>
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377 </table>
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378
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379 <h3>Accessing Java objects and arrays in script</h3>
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380
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381 <p>
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382 From a given Java object, we can access all fields of the Java object by usual '.' operator. i.e., if you got a Java object
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383 called 'o' of type java.lang.Thread from debuggee, you can access 'stackSize' field by o.stackSize syntax. Similarly, length of Java array
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384 objects can be accessed by length property. And array indexing follows usual syntax. i.e., n'th element of array 'a' is
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385 accessed by a[n].
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386 </p>
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387
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388 <h3>jvm.threads array</h3>
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389
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390 <p>
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391 This is a JavaScript array of Java threads of the debuggee. As usual, 'length' property tells the number of threads and individual
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392 threads may be accessed by index operator -- i.e, jvm.threads[0] returns the first thread.
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393 </p>
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394
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395 <h3>thread object</h3>
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396
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397
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398 <p>
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399 In addition to the fields of java.lang.Thread (or subclass) fields, thread objects have two additional properties.
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400
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401 <ul>
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402 <li>frames -- array of stack frame objects
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403 <li>monitors -- array of monitor objects owned by the thread
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404 </ul>
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405
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406 </p>
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407
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408 <h3>stack frame object</h3>
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409
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410 <table border="1">
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411 <tr>
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412 <th>
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413 Property name
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414 </th>
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415 <th>
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416 Description
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417 </th>
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418 </tr>
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419 <td>
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420 thisObject
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421 </td>
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422 <td>
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423 Object representing 'this' of the current frame [will be null for static methods]
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424 </td>
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425 </tr>
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426 <tr>
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427 <td>
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428 locals
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429 </td>
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430 <td>
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431 name-value pairs of local variables [JavaScript associative array]
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432 </td>
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433 </tr>
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434 <tr>
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435 <td>
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436 line
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437 </td>
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438 <td>
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439 Java source line number at which the frame is executing
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440 </td>
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441 </tr>
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442 <tr>
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443 <td>
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444 bci
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445 </td>
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446 <td>
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447 byte code index of the bytecode that the frame is executing
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448 </td>
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449 </tr>
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450 <tr>
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451 <td>
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452 thread
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453 </td>
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454 <td>
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455 thread to which this frame belongs
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456 </td>
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457 </tr>
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458 <tr>
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459 <td>
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460 method
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461 </td>
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|
462 <td>
|
|
|
463 Java method that the frame is executing
|
|
|
464 </td>
|
|
|
465 </tr>
|
|
|
466 </table>
|
|
|
467
|
|
|
468 <h3>method object</h3>
|
|
|
469
|
|
|
470 <p>
|
|
|
471 method object represents a Java method of debuggee
|
|
|
472 </p>
|
|
|
473
|
|
|
474 <table border="1">
|
|
|
475 <tr>
|
|
|
476 <th>
|
|
|
477 Property name
|
|
|
478 </th>
|
|
|
479 <th>
|
|
|
480 Description
|
|
|
481 </th>
|
|
|
482 </tr>
|
|
|
483 <tr>
|
|
|
484 <td>
|
|
|
485 isStatic
|
|
|
486 </td>
|
|
|
487 <td>
|
|
|
488 boolean - true for static methods and false for non-static methods
|
|
|
489 </td>
|
|
|
490 </tr>
|
|
|
491
|
|
|
492 <tr>
|
|
|
493 <td>
|
|
|
494 isSynchronized
|
|
|
495 </td>
|
|
|
496 <td>
|
|
|
497 boolean - true for synchronized methods and false for non-synchronized methods
|
|
|
498 </td>
|
|
|
499 </tr>
|
|
|
500
|
|
|
501 <tr>
|
|
|
502 <td>
|
|
|
503 isNative
|
|
|
504 </td>
|
|
|
505 <td>
|
|
|
506 boolean - true for native methods and false for non-native methods
|
|
|
507 </td>
|
|
|
508 </tr>
|
|
|
509
|
|
|
510 <tr>
|
|
|
511 <td>
|
|
|
512 isProtected
|
|
|
513 </td>
|
|
|
514 <td>
|
|
|
515 boolean - true for protected methods and false for non-protected methods
|
|
|
516 </td>
|
|
|
517 </tr>
|
|
|
518
|
|
|
519 <tr>
|
|
|
520 <td>
|
|
|
521 isPrivate
|
|
|
522 </td>
|
|
|
523 <td>
|
|
|
524 boolean - true for private methods and false for non-private methods
|
|
|
525 </td>
|
|
|
526 </tr>
|
|
|
527
|
|
|
528 <tr>
|
|
|
529 <td>
|
|
|
530 isSynthetic
|
|
|
531 </td>
|
|
|
532 <td>
|
|
|
533 boolean - true for Javac generated synthetic methods and false for non-synthetic methods
|
|
|
534 </td>
|
|
|
535 </tr>
|
|
|
536
|
|
|
537 <tr>
|
|
|
538 <td>
|
|
|
539 isPackagePrivate
|
|
|
540 </td>
|
|
|
541 <td>
|
|
|
542 boolean - true for package-private methods and false for non-package-private methods
|
|
|
543 </td>
|
|
|
544 </tr>
|
|
|
545
|
|
|
546 <tr>
|
|
|
547 <td>
|
|
|
548 isPublic
|
|
|
549 </td>
|
|
|
550 <td>
|
|
|
551 boolean - true for public methods and false for non-public methods
|
|
|
552 </td>
|
|
|
553 </tr>
|
|
|
554
|
|
|
555 <tr>
|
|
|
556 <td>
|
|
|
557 holder
|
|
|
558 </td>
|
|
|
559 <td>
|
|
|
560 an object that represents Class that contains this method
|
|
|
561 </td>
|
|
|
562 </tr>
|
|
|
563
|
|
|
564 <tr>
|
|
|
565 <td>
|
|
|
566 signature
|
|
|
567 </td>
|
|
|
568 <td>
|
|
|
569 string -- signature of this method
|
|
|
570 </td>
|
|
|
571 </tr>
|
|
|
572
|
|
|
573 <tr>
|
|
|
574 <td>
|
|
|
575 isObsolete
|
|
|
576 </td>
|
|
|
577 <td>
|
|
|
578 boolean - true for obsolete (hotswapped) methods and false for non-obsolete methods
|
|
|
579 </td>
|
|
|
580 </tr>
|
|
|
581
|
|
|
582 <tr>
|
|
|
583 <td>
|
|
|
584 isStrict
|
|
|
585 </td>
|
|
|
586 <td>
|
|
|
587 boolean - true for strictfp methods and false for non-strictfp methods
|
|
|
588 </td>
|
|
|
589 </tr>
|
|
|
590
|
|
|
591 <tr>
|
|
|
592 <td>
|
|
|
593 isFinal
|
|
|
594 </td>
|
|
|
595 <td>
|
|
|
596 boolean - true for final methods and false for non-final methods
|
|
|
597 </td>
|
|
|
598 </tr>
|
|
|
599
|
|
|
600 <tr>
|
|
|
601 <td>
|
|
|
602 name
|
|
|
603 </td>
|
|
|
604 <td>
|
|
|
605 string - name of this method
|
|
|
606 </td>
|
|
|
607 </tr>
|
|
|
608 </table>
|
|
|
609
|
|
|
610 <h3>class object</h3>
|
|
|
611
|
|
|
612 <p>
|
|
|
613 A class object represents loaded Java class in debuggee VM. This represents java.lang.Class instance in the debuggee.
|
|
|
614 This is type of return value of classof global function. Also, method.holder property and field.holder are
|
|
|
615 of this type.
|
|
|
616 </p>
|
|
|
617
|
|
|
618 <table border="1">
|
|
|
619 <tr>
|
|
|
620 <th>
|
|
|
621 Property name
|
|
|
622 </th>
|
|
|
623 <th>
|
|
|
624 Description
|
|
|
625 </th>
|
|
|
626 </tr>
|
|
|
627
|
|
|
628 <tr>
|
|
|
629 <td>
|
|
|
630 name
|
|
|
631 </td>
|
|
|
632 <td>
|
|
|
633 name of this class
|
|
|
634 </td>
|
|
|
635 </tr>
|
|
|
636
|
|
|
637 <tr>
|
|
|
638 <td>
|
|
|
639 superClass
|
|
|
640 </td>
|
|
|
641 <td>
|
|
|
642 class object representing super class of this class
|
|
|
643 </td>
|
|
|
644 </tr>
|
|
|
645
|
|
|
646 <tr>
|
|
|
647 <td>
|
|
|
648 isArrayClass
|
|
|
649 </td>
|
|
|
650 <td>
|
|
|
651 boolean -- is the current class an array class?
|
|
|
652 </td>
|
|
|
653 </tr>
|
|
|
654
|
|
|
655 <tr>
|
|
|
656 <td>
|
|
|
657 isStatic
|
|
|
658 </td>
|
|
|
659 <td>
|
|
|
660 boolean -- is the current class static or not
|
|
|
661 </td>
|
|
|
662 </tr>
|
|
|
663
|
|
|
664 <tr>
|
|
|
665 <td>
|
|
|
666 isInterface
|
|
|
667 </td>
|
|
|
668 <td>
|
|
|
669 boolean -- is the current class an interface
|
|
|
670 </td>
|
|
|
671 </tr>
|
|
|
672
|
|
|
673 <tr>
|
|
|
674 <td>
|
|
|
675 isAbstract
|
|
|
676 </td>
|
|
|
677 <td>
|
|
|
678 boolean -- is the current class abstract or not
|
|
|
679 </td>
|
|
|
680 </tr>
|
|
|
681
|
|
|
682 <tr>
|
|
|
683 <td>
|
|
|
684 isProtected
|
|
|
685 </td>
|
|
|
686 <td>
|
|
|
687 boolean -- is the current class protected or not
|
|
|
688 </td>
|
|
|
689 </tr>
|
|
|
690
|
|
|
691 <tr>
|
|
|
692 <td>
|
|
|
693 isPrivate
|
|
|
694 </td>
|
|
|
695 <td>
|
|
|
696 boolean -- is the current class private or not
|
|
|
697 </td>
|
|
|
698 </tr>
|
|
|
699
|
|
|
700 <tr>
|
|
|
701 <td>
|
|
|
702 isPackagePrivate
|
|
|
703 </td>
|
|
|
704 <td>
|
|
|
705 boolean -- is the current class package private or not
|
|
|
706 </td>
|
|
|
707 </tr>
|
|
|
708
|
|
|
709 <tr>
|
|
|
710 <td>
|
|
|
711 isSynthetic
|
|
|
712 </td>
|
|
|
713 <td>
|
|
|
714 boolean -- is the current class synthetic or not
|
|
|
715 </td>
|
|
|
716 </tr>
|
|
|
717
|
|
|
718 <tr>
|
|
|
719 <td>
|
|
|
720 classLoader
|
|
|
721 </td>
|
|
|
722 <td>
|
|
|
723 object that represents ClassLoader object that loaded the current class
|
|
|
724 </td>
|
|
|
725 </tr>
|
|
|
726
|
|
|
727
|
|
|
728 <tr>
|
|
|
729 <td>
|
|
|
730 fields
|
|
|
731 </td>
|
|
|
732 <td>
|
|
|
733 array of static and instance fields of the current class
|
|
|
734 </td>
|
|
|
735 </tr>
|
|
|
736
|
|
|
737 <tr>
|
|
|
738 <td>
|
|
|
739 protectionDomain
|
|
|
740 </td>
|
|
|
741 <td>
|
|
|
742 protection domain to which current class belongs
|
|
|
743 </td>
|
|
|
744 </tr>
|
|
|
745
|
|
|
746 <tr>
|
|
|
747 <td>
|
|
|
748 isPublic
|
|
|
749 </td>
|
|
|
750 <td>
|
|
|
751 boolean -- is the current class public or not
|
|
|
752 </td>
|
|
|
753 </tr>
|
|
|
754
|
|
|
755 <tr>
|
|
|
756 <td>
|
|
|
757 signers
|
|
|
758 </td>
|
|
|
759 <td>
|
|
|
760 array of signers for current class
|
|
|
761 </td>
|
|
|
762 </tr>
|
|
|
763
|
|
|
764 <tr>
|
|
|
765 <td>
|
|
|
766 sourceFile
|
|
|
767 </td>
|
|
|
768 <td>
|
|
|
769 string -- name of the source file for current class
|
|
|
770 </td>
|
|
|
771 </tr>
|
|
|
772
|
|
|
773 <tr>
|
|
|
774 <td>
|
|
|
775 interfaces
|
|
|
776 </td>
|
|
|
777 <td>
|
|
|
778 array -- interfaces implemented by current class
|
|
|
779 </td>
|
|
|
780 </tr>
|
|
|
781
|
|
|
782 <tr>
|
|
|
783 <td>
|
|
|
784 isStrict
|
|
|
785 </td>
|
|
|
786 <td>
|
|
|
787 boolean -- is the current class strictfp or not
|
|
|
788 </td>
|
|
|
789 </tr>
|
|
|
790
|
|
|
791 <tr>
|
|
|
792 <td>
|
|
|
793 methods
|
|
|
794 </td>
|
|
|
795 <td>
|
|
|
796 array of methods (static and instance) of the current class
|
|
|
797 </td>
|
|
|
798 </tr>
|
|
|
799
|
|
|
800
|
|
|
801 <tr>
|
|
|
802 <td>
|
|
|
803 isFinal
|
|
|
804 </td>
|
|
|
805 <td>
|
|
|
806 boolean -- is the current class final or not
|
|
|
807 </td>
|
|
|
808 </tr>
|
|
|
809
|
|
|
810 <tr>
|
|
|
811 <td>
|
|
|
812 statics
|
|
|
813 </td>
|
|
|
814 <td>
|
|
|
815 name-value pairs (JavaScript associate array) of static fields of the current class
|
|
|
816 </td>
|
|
|
817 </tr>
|
|
|
818 </table>
|
|
|
819
|
|
|
820 <h3>field object</h3>
|
|
|
821 <p>
|
|
|
822 field represents a static or instance field of some class in debuggee
|
|
|
823 </p>
|
|
|
824
|
|
|
825 <table border="1">
|
|
|
826 <tr>
|
|
|
827 <th>
|
|
|
828 Property name
|
|
|
829 </th>
|
|
|
830 <th>
|
|
|
831 Description
|
|
|
832 </th>
|
|
|
833 </tr>
|
|
|
834
|
|
|
835 <tr>
|
|
|
836 <td>
|
|
|
837 isStatic
|
|
|
838 </td>
|
|
|
839 <td>
|
|
|
840 boolean -- is this field a static field?
|
|
|
841 </td>
|
|
|
842 </tr>
|
|
|
843
|
|
|
844 <tr>
|
|
|
845 <td>
|
|
|
846 holder
|
|
|
847 </td>
|
|
|
848 <td>
|
|
|
849 class that owns this field
|
|
|
850 </td>
|
|
|
851 </tr>
|
|
|
852
|
|
|
853 <tr>
|
|
|
854 <td>
|
|
|
855 signature
|
|
|
856 </td>
|
|
|
857 <td>
|
|
|
858 string signature of this field
|
|
|
859 </td>
|
|
|
860 </tr>
|
|
|
861
|
|
|
862 <tr>
|
|
|
863 <td>
|
|
|
864 isProtected
|
|
|
865 </td>
|
|
|
866 <td>
|
|
|
867 boolean - is this field a protected field or not?
|
|
|
868 </td>
|
|
|
869 </tr>
|
|
|
870
|
|
|
871 <tr>
|
|
|
872 <td>
|
|
|
873 isPrivate
|
|
|
874 </td>
|
|
|
875 <td>
|
|
|
876 boolean - is this field a private field or not?
|
|
|
877 </td>
|
|
|
878 </tr>
|
|
|
879
|
|
|
880 <tr>
|
|
|
881 <td>
|
|
|
882 isSynthetic
|
|
|
883 </td>
|
|
|
884 <td>
|
|
|
885 boolean - is this javac generated synthetic field or not?
|
|
|
886 </td>
|
|
|
887 </tr>
|
|
|
888
|
|
|
889 <tr>
|
|
|
890 <td>
|
|
|
891 isPackagePrivate
|
|
|
892 </td>
|
|
|
893 <td>
|
|
|
894 boolean - is this field a package private field or not?
|
|
|
895 </td>
|
|
|
896 </tr>
|
|
|
897
|
|
|
898 <tr>
|
|
|
899 <td>
|
|
|
900 isTransient
|
|
|
901 </td>
|
|
|
902 <td>
|
|
|
903 boolean - is this field a transient field or not?
|
|
|
904 </td>
|
|
|
905 </tr>
|
|
|
906
|
|
|
907 <tr>
|
|
|
908 <td>
|
|
|
909 isFinal
|
|
|
910 </td>
|
|
|
911 <td>
|
|
|
912 boolean - is this field final or not?
|
|
|
913 </td>
|
|
|
914 </tr>
|
|
|
915
|
|
|
916 <tr>
|
|
|
917 <td>
|
|
|
918 name
|
|
|
919 </td>
|
|
|
920 <td>
|
|
|
921 string - name of this field
|
|
|
922 </td>
|
|
|
923 </tr>
|
|
|
924
|
|
|
925 <tr>
|
|
|
926 <td>
|
|
|
927 isPublic
|
|
|
928 </td>
|
|
|
929 <td>
|
|
|
930 boolean - is this field public or not?
|
|
|
931 </td>
|
|
|
932 </tr>
|
|
|
933 </table>
|
|
|
934
|
|
|
935 <h3>Initialization Script</h3>
|
|
|
936 <p>
|
|
|
937 jsdb engine looks for initialization script file named <b>jsdb.js</b> in user's home directory. If found, it loads just after attaching to debuggee but before printing prompt for user's input. User can assume that s/he can access debuggee VM
|
|
|
938 state during initialization script.
|
|
|
939 </p>
|
|
|
940
|
|
|
941 <h3>Sample scripts</h3>
|
|
|
942
|
|
|
943 Semantics and knowledge of application classes (for eg. AppServer's classes) would be needed to create app specific
|
|
|
944 scripts. The following script samples are app-independent and provide a flavour of kind of scripts that can be written.
|
|
|
945
|
|
|
946 <h4>Script to print system properties of JVM</h4>
|
|
|
947
|
|
|
948 <pre>
|
|
|
949 <code>
|
|
|
950 jvm.sysProps.toString()
|
|
|
951 </code>
|
|
|
952 </pre>
|
|
|
953
|
|
|
954 <h4>Script to print JVM command line flags</h4>
|
|
|
955 <pre>
|
|
|
956 <code>
|
|
|
957 jvm.flags.toString()
|
|
|
958 </code>
|
|
|
959 </pre>
|
|
|
960
|
|
|
961
|
|
|
962 <h4>Script to print class-wise histogram of objects</h4>
|
|
|
963
|
|
|
964 <pre>
|
|
|
965 <code>
|
|
|
966
|
|
|
967 // associate array to hold histogram
|
|
|
968 var histo;
|
|
|
969 function func(obj) {
|
|
|
970 var classname = classof(obj).name;
|
|
|
971 if (histo[classname] == undefined) {
|
|
|
972 // first time we are visiting this class type
|
|
|
973 histo[classname] = 1;
|
|
|
974 } else {
|
|
|
975 histo[classname]++;
|
|
|
976 }
|
|
|
977 }
|
|
|
978
|
|
|
979 // iterate through java heap calling 'func' for each object
|
|
|
980 jvm.heap.forEachObject(func);
|
|
|
981
|
|
|
982 // print the histogram
|
|
|
983 for (i in histo) {
|
|
|
984 println('number of instances of ', i, ' = ', histo[i]);
|
|
|
985 }
|
|
|
986
|
|
|
987 </code>
|
|
|
988 </pre>
|
|
|
989
|
|
|
990 <h4>Script to print stack trace of all Java threads</h4>
|
|
|
991
|
|
|
992 <pre>
|
|
|
993 <code>
|
|
|
994
|
|
|
995 function printStackTrace(t) {
|
|
|
996 println(t.name);
|
|
|
997 println('');
|
|
|
998 for (i in t.frames) {
|
|
|
999 println(t.frames[i]);
|
|
|
1000 }
|
|
|
1001 println('');
|
|
|
1002 }
|
|
|
1003
|
|
|
1004 // walk through the list of threads and call printStackTrace
|
|
|
1005 // for each thread
|
|
|
1006 for (o in jvm.threads) {
|
|
|
1007 printStackTrace(jvm.threads[o]);
|
|
|
1008 }
|
|
|
1009
|
|
|
1010
|
|
|
1011 </code>
|
|
|
1012 </pre>
|
|
|
1013
|
|
|
1014
|
|
|
1015 <h4>Script to re-construct .class files for all non-bootstrap classes</h4>
|
|
|
1016
|
|
|
1017 <pre>
|
|
|
1018 <code>
|
|
|
1019
|
|
|
1020 function dump(cl) {
|
|
|
1021 if (!cl.isArrayClass && cl.classLoader != null) {
|
|
|
1022 // not an array class and a non-bootstrap class
|
|
|
1023 // create .class files in e:\tmp dir
|
|
|
1024 dumpClass(cl, "e:\\tmp);
|
|
|
1025 } else {
|
|
|
1026 println("skipping bootstrap class ", cl.name);
|
|
|
1027 }
|
|
|
1028 }
|
|
|
1029
|
|
|
1030 // walk thru heap and call callback for each java.lang.Class instance
|
|
|
1031 jvm.heap.forEachObject(dump, "java.lang.Class");
|
|
|
1032 </code>
|
|
|
1033 </pre>
|
|
|
1034
|
|
|
1035 <h4>Script to print paths of all java.io.File's currently accessed</h4>
|
|
|
1036
|
|
|
1037 <pre>
|
|
|
1038 <code>
|
|
|
1039
|
|
|
1040 function printFile(f) {
|
|
|
1041 // construct a mirror java.io.File here and
|
|
|
1042 // print absolute path here
|
|
|
1043 println(mirror(f).getAbsolutePath());
|
|
|
1044 }
|
|
|
1045
|
|
|
1046 jvm.heap.forEachObject(printFile, "java.io.File");
|
|
|
1047
|
|
|
1048 </code>
|
|
|
1049 </pre>
|
|
|
1050
|
|
|
1051 <h4>Script to print static fields of java.lang.Thread class</h4>
|
|
|
1052 <pre>
|
|
|
1053 <code>
|
|
|
1054
|
|
|
1055 var threadClass = classof("java.lang.Thread");
|
|
|
1056 for (i in threadClass.statics) {
|
|
|
1057 println(i, '=', threadClass.statics[i]);
|
|
|
1058 }
|
|
|
1059
|
|
|
1060 </code>
|
|
|
1061 </pre>
|
|
|
1062
|
|
|
1063 <h3>Low level interface (VM State)</h3>
|
|
|
1064
|
|
|
1065 <p>
|
|
|
1066 Low level jsdb interface works by <a href="http://www.mozilla.org/rhino/ScriptingJava.html">JavaScript-to-Java (previously known as "LiveConnect")
|
|
|
1067 interface</a> provided by Rhino JavaScript engine.
|
|
|
1068 </p>
|
|
|
1069
|
|
|
1070 <h2>sapkg object</h2>
|
|
|
1071 <p>
|
|
|
1072 This object provides short names for SA package names. For eg. instead of writing
|
|
|
1073 Packages.sun.jvm.hotspot.memory, we can write sapkg.memory.
|
|
|
1074 </p>
|
|
|
1075
|
|
|
1076 <h2>sa object</h2>
|
|
|
1077 <p>
|
|
|
1078 This object contains all SA singleton objects such as VM, Universe, SymbolTable,
|
|
|
1079 SystemDictionary, ObjectHeap, CollectedHeap, Debugger, CDebugger (if available),
|
|
|
1080 Interpreter, TypeDataBase and Threads. For eg. to access SymbolTable of Java debuggee,
|
|
|
1081 we can use sa.symbolTable. User can execute the following code to get fields of this object.
|
|
|
1082 </p>
|
|
|
1083 <pre>
|
|
|
1084 <code>
|
|
|
1085 for (i in sa) {
|
|
|
1086 println(i);
|
|
|
1087 }
|
|
|
1088 </code>
|
|
|
1089 </pre>
|
|
|
1090
|
|
|
1091 <h4>Heap Iterators</h4>
|
|
|
1092 <dl>
|
|
|
1093 <dt>forEachOop(callback)</dt>
|
|
|
1094 <dd>calls a callback function for each Oop in Java heap</dd>
|
|
|
1095 <dt>forEachOopOfKlass(callback, klass, [includeSubtypes])</dt>
|
|
|
1096 <dd>calls a callback function for each Oop of a give Klass type
|
|
|
1097 Optinally, third argument can specify whether to include subtype Oops
|
|
|
1098 or not.
|
|
|
1099 </dd>
|
|
|
1100 </dl>
|
|
|
1101
|
|
|
1102 <h4>System Dictionary Access</h4>
|
|
|
1103 <dl>
|
|
|
1104 <dt>forEachKlass(callback)</dt>
|
|
|
1105 <dd>calls a callback function for each Klass in Java heap</dd>
|
|
|
1106 <dt>forEachKlassAndLoader(callback)</dt>
|
|
|
1107 <dd>
|
|
|
1108 calls callback with Klass and initiating loader (Oop) for System dictionary
|
|
|
1109 entry.
|
|
|
1110 </dd>
|
|
|
1111 <dt>forEachPrimArrayKlass(callback)</dt>
|
|
|
1112 <dd>
|
|
|
1113 calls callback with Klass and initiating loader (Oop) for each
|
|
|
1114 primitive array Klass in the system.
|
|
|
1115 </dd>
|
|
|
1116 <dt>findInstanceKlass(name)</dt>
|
|
|
1117 <dd>
|
|
|
1118 finds the first instance klass with given name from System dictionary
|
|
|
1119 </dd>
|
|
|
1120 </dl>
|
|
|
1121
|
|
|
1122 <h4>Thread, Frame Iterators</h4>
|
|
|
1123 <dl>
|
|
|
1124 <dt>forEachJavaThread(callback)</dt>
|
|
|
1125 <dd>calls callback for each Java Thread</dd>
|
|
|
1126 <dt>forEachFrame(javaThread, callback)</dt>
|
|
|
1127 <dd>calls callback for each Frame of a given JavaThread</dd>
|
|
|
1128 <dt>forEachVFrame(javaThread, callback)</dt>
|
|
|
1129 <dd>calls callback for each JavaVFrame of a given JavaThread</dd>
|
|
|
1130 <dt>forEachThread(callback)</dt>
|
|
|
1131 <dd>calls callback for each (native) ThreadProxy (obtained by CDebugger.getThreadList)
|
|
|
1132 </dd>
|
|
|
1133 <dt>forEachCFrame(threadProxy, callback)</dt>
|
|
|
1134 <dd>
|
|
|
1135 calls callback for each CFrame of a given ThreadProxy object
|
|
|
1136 </dd>
|
|
|
1137 </dl>
|
|
|
1138
|
|
|
1139 <h4>Code blobs, Interpreter codelets</h4>
|
|
|
1140 <dl>
|
|
|
1141 <dt>forEachCodeBlob(callback)</dt>
|
|
|
1142 <dd>
|
|
|
1143 calls callback with each code blob in code cache
|
|
|
1144 </dd>
|
|
|
1145 <dt>findCodeBlob(address)</dt>
|
|
|
1146 <dd>
|
|
|
1147 finds the code blob, if any, that contains the given address.
|
|
|
1148 Returns null, on failure.
|
|
|
1149 </dd>
|
|
|
1150 <dt>findNMethod(address)</dt>
|
|
|
1151 <dd>
|
|
|
1152 finds the NMethod that contains given address.
|
|
|
1153 </dd>
|
|
|
1154 <dt>pcDescAt(addr)</dt>
|
|
|
1155 <dd>
|
|
|
1156 returns PCDesc at given address or null.
|
|
|
1157 </dd>
|
|
|
1158 <dt>forEachInterpCodelet(callbacl)</dt>
|
|
|
1159 <dd>
|
|
|
1160 calls callback with each Interpreter codelet
|
|
|
1161 </dd>
|
|
|
1162 </dl>
|
|
|
1163
|
|
|
1164 <h4>VM structs, constants</h4>
|
|
|
1165 <dl>
|
|
|
1166 <dt>forEachType(callback)</dt>
|
|
|
1167 <dd>
|
|
|
1168 calls callback for each Type in VM's type database
|
|
|
1169 </dd>
|
|
|
1170 <dt>forEachVMIntConst(callback)</dt>
|
|
|
1171 <dd>
|
|
|
1172 calls callback for each named integer constant. passes name
|
|
|
1173 as argument.
|
|
|
1174 </dd>
|
|
|
1175 <dt>forEachVMLongConst(callback)</dt>
|
|
|
1176 <dd>
|
|
|
1177 calls callback for each named long constant. passes name
|
|
|
1178 as argument.
|
|
|
1179 </dd>
|
|
|
1180 <dt>findVMType(name)</dt>
|
|
|
1181 <dd>
|
|
|
1182 finds a VM type by name. returns null if no known Type of given name
|
|
|
1183 exists in type database.
|
|
|
1184 </dd>
|
|
|
1185 <dt>findVMIntConst(name)</dt>
|
|
|
1186 <dd>
|
|
|
1187 finds an integer constant in type data base by name.
|
|
|
1188 </dd>
|
|
|
1189 <dt>findVMLongConst(name)</dt>
|
|
|
1190 <dd>
|
|
|
1191 finds an long constant in type data base by name.
|
|
|
1192 </dd>
|
|
|
1193 <dt>vmTypeof(addr)</dt>
|
|
|
1194 <dd>
|
|
|
1195 returns VM type of object at 'addr' if any. Else, returns null.
|
|
|
1196 </dd>
|
|
|
1197 <dt>isOfVMType(addr, type)</dt>
|
|
|
1198 <dd>
|
|
|
1199 returns whether object at 'addr' is of VM type 'type' or not.
|
|
|
1200 </dd>
|
|
|
1201 <dt>printVMType(type, addr)</dt>
|
|
|
1202 <dd>
|
|
|
1203 prints 'addr' as VM object of type 'type'
|
|
|
1204 </dd>
|
|
|
1205 <dt>print<i>XXX</i>(addr)</dt>
|
|
|
1206 <dd>
|
|
|
1207 For each VM type, these functions are defined. For eg. there is printUniverse,
|
|
|
1208 printSystemDictionary etc. are available. Without 'addr' being passed static fields are printed. With 'addr' param being passed, instance fields are printed.
|
|
|
1209 </dd>
|
|
|
1210 </dl>
|
|
|
1211
|
|
|
1212 <h4>Low level debugger facilities</h4>
|
|
|
1213 <dl>
|
|
|
1214 <dt>num2addr(number)</dt>
|
|
|
1215 <dd>
|
|
|
1216 converts a (long) number to SA Address instance
|
|
|
1217 </dd>
|
|
|
1218 <dt>str2addr(string)</dt>
|
|
|
1219 <dd>
|
|
|
1220 converts a given hex string to SA Address instance
|
|
|
1221 </dd>
|
|
|
1222 <dt>any2addr(any)</dt>
|
|
|
1223 <dd>
|
|
|
1224 Takes a number or a string or an Address and returns
|
|
|
1225 an Address instance. For other types, returns 'undefined'
|
|
|
1226 </dd>
|
|
|
1227 <dt>addr2str(addr)</dt>
|
|
|
1228 <dd>
|
|
|
1229 converts a given Address instance to a hex string
|
|
|
1230 </dd>
|
|
|
1231 <dt>addr2num(addr)</dt>
|
|
|
1232 <dd>
|
|
|
1233 converts a given Address instance to a (long) number
|
|
|
1234 </dd>
|
|
|
1235 <dt>sym2addr(library, symbol)</dt>
|
|
|
1236 <dd>
|
|
|
1237 returns Address of a given symbol in a given library (shared object or DLL)
|
|
|
1238 Example: sym2addr('jvm.dll', 'JNI_CreateJavaVM')
|
|
|
1239 <dt>addr2sym(addr)</dt>
|
|
|
1240 <dd>
|
|
|
1241 Returns nearest symbol to a given address (if any). If no such symbol is found,
|
|
|
1242 returns the given address as a string.
|
|
|
1243 </dd>
|
|
|
1244 <dt>readBytesAt(addr, num)</dt>
|
|
|
1245 <dd>
|
|
|
1246 returns 'num' bytes at 'addr' as a Java byte[]
|
|
|
1247 </dd>
|
|
|
1248 <dt>readWordsAt(addr, num)</dt>
|
|
|
1249 <dd>
|
|
|
1250 returns 'num' words at 'addr' as a Java long[]
|
|
|
1251 </dd>
|
|
|
1252 <dt>readCStrAt(addr)</dt>
|
|
|
1253 <dd>
|
|
|
1254 returns 'C' String at given address
|
|
|
1255 </dd>
|
|
|
1256 <dt>readCStrLen(addr)</dt>
|
|
|
1257 <dd>
|
|
|
1258 returns the length of the 'C' String at given address
|
|
|
1259 </dd>
|
|
|
1260 <dt>readRegs(threadProxy)</dt>
|
|
|
1261 <dd>
|
|
|
1262 returns register set (of Thread Context) of a given thread specified
|
|
|
1263 by threadProxy. return value is an associate array having name-value pairs
|
|
|
1264 of registers.
|
|
|
1265 </dd>
|
|
|
1266 <dt>regs(threadProxy)</dt>
|
|
|
1267 <dd>
|
|
|
1268 prints register set of a given thread.
|
|
|
1269 </dd>
|
|
|
1270 <dt>mem(addr, [num])</dt>
|
|
|
1271 <dd>
|
|
|
1272 prints 'num' words (address size) at 'addr'. Prints nearest symbol for address, if found.
|
|
|
1273 </dd>
|
|
|
1274 <dt>dis(addr, [num])</dt>
|
|
|
1275 <dd>prints native code disassembly of 'num' bytes at given address 'addr'.
|
|
|
1276 Default value of 'num' is 4. This automatically detects whether the given address
|
|
|
1277 inside a nmethod. If so, it prints safepoint info, entry points , method signature etc.
|
|
|
1278 of the nmethod.
|
|
|
1279 </dd>
|
|
|
1280 <dt>jdis(method [or addr])</dt>
|
|
|
1281 <dd>
|
|
|
1282 prints Java bytecode disassembly for given method Oop or address of a method Oop.
|
|
|
1283 </dd>
|
|
|
1284 <dt>nmethoddis(nmethod)</dt>
|
|
|
1285 <dd>
|
|
|
1286 prints disassembly of given nmethod object. Note that you don't have to call this directly
|
|
|
1287 instead use 'dis'.
|
|
|
1288 </dd>
|
|
|
1289 <dt>where</dt>
|
|
|
1290 <dd>
|
|
|
1291 prints Java stack trace for all Java threads
|
|
|
1292 </dd>
|
|
|
1293 </dl>
|
|
|
1294
|
|
|
1295 <h4>Miscellaneous</h4>
|
|
|
1296 <dl>
|
|
|
1297 <dt>addr2oop(addr)</dt>
|
|
|
1298 <dd>
|
|
|
1299 converts a given address to a Oop object
|
|
|
1300 </dd>
|
|
|
1301 <dt>oop2addr(oop)</dt>
|
|
|
1302 <dd>
|
|
|
1303 returns address of a given Oop object
|
|
|
1304 </dd>
|
|
|
1305 <dt>isOfVMType(addr, type)</dt>
|
|
|
1306 <dd>
|
|
|
1307 returns whether the given 'addr' points to a (C++) VM object of specified
|
|
|
1308 type. type may be specified by SA Type object or string name of the type.
|
|
|
1309 </dd>
|
|
|
1310 <dt>newVMObject(addr)</dt>
|
|
|
1311 <dd>
|
|
|
1312 returns instance of SA object for a given address (similar to SA VirtualConstructor
|
|
|
1313 interface).
|
|
|
1314 </dd>
|
|
|
1315 <dt>vmobj2addr(vmobject)</dt>
|
|
|
1316 <dd>
|
|
|
1317 returns Address represented by a given SA VMObject
|
|
|
1318 </dd>
|
|
|
1319 <dt>addr2vmobj(addr)</dt>
|
|
|
1320 <dd>same as newVMObject(addr)</dd>
|
|
|
1321 <dt>whatis(addr)</dt>
|
|
|
1322 <dd>
|
|
|
1323 returns string description of given address (using SA FindPointer and guess type API).
|
|
|
1324 <dt>isOop(addr)</dt>
|
|
|
1325 <dd>
|
|
|
1326 returns whether a given address is a valid Oop address or not
|
|
|
1327 </dd>
|
|
|
1328 </dl>
|
|
|
1329
|
|
|
1330 <h4>Moving b/w jsdb low level and high level interfaces</h4>
|
|
|
1331
|
|
|
1332 <p>
|
|
|
1333 Java objects of debuggee are represented by different script wrappers in high level
|
|
|
1334 interface. In the low-level interface these are instances of SA Oop class or its'
|
|
|
1335 subclass. To move b/w low-level and high-level interfaces the following functions may
|
|
|
1336 be used
|
|
|
1337 </p>
|
|
|
1338 <dl>
|
|
|
1339 <dt>oop2obj(oop)</dt>
|
|
|
1340 <dd>
|
|
|
1341 converts a given Oop object to a high-level wrapper object
|
|
|
1342 </dd>
|
|
|
1343 <dt>obj2oop(obj)</dt>
|
|
|
1344 <dd>
|
|
|
1345 converts a jsdb high level wrapper to underlying Oop instance
|
|
|
1346 </dd>
|
|
|
1347 </dl>
|
|
|
1348
|
|
|
1349 <h3>JavaScript tips</h3>
|
|
|
1350
|
|
|
1351 <ul>
|
|
|
1352 <li>to know properties, functions of any object, use the script
|
|
|
1353 <pre>
|
|
|
1354 <core>
|
|
|
1355 for(i in object) { println(i); }
|
|
|
1356 </code>
|
|
|
1357 </pre>
|
|
|
1358 <li>to view the source code of any function, just type the name of
|
|
|
1359 function in jsdb prompt
|
|
|
1360 <li>to view global functions, properties, run
|
|
|
1361 <pre>
|
|
|
1362 <code>
|
|
|
1363 for(i in this) { println(i); }
|
|
|
1364 </code>
|
|
|
1365 </pre>
|
|
|
1366 </ul>
|
|
|
1367
|
|
|
1368 </body>
|
|
|
1369 </html>
|
