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<html>
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<head>
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<title>
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JavaScript interface to Hotspot Serviceability Agent
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</title>
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</head>
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<body>
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<h1>JavaScript interface to Hotspot Serviceability Agent</h1>
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<p>
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Serviceability Agent (SA) provides Java API and tools to diagnose HotSpot Virtual Machine and
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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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</p>
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<h2>Existing SA APIs</h2>
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<p>
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There are two application programmer interfaces (APIs) for SA:
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<dl>
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<dt>1. Private java API
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</dt>
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<dd>
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This tries to mimic hotspot VM's internal C++ classes and methods. Because VM data structures
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are a moving target, this API can never be 'stable'! Besides, to use SA's private API knowledge of
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HotSpot code base is essential.
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</dd>
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<dt>2. SA-JDI -- Java Debugger Interface read-only subset API
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</dt>
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<dd>
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This is read-only subset of JDI (Java Debugger Interface)
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This is a standardized interface to get java level state of a java process or java core dump. While this
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interface is useful, this misses parts of java level state from target process or core such as
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<ul>
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<li>heap walking interface -- only objects traceable to static variables (of classes) and local
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variables of stack frames can be accessed.
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<li>re-constructing .class from debuggee are missing.
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<li>re-constructing object mirrors for Java objects of the debuggee.
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</ul>
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</dd>
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</dl>
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</p>
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<h2>SA Scripting interface</h2>
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<p>
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Traditionally, platform debuggers such as dbx, gdb and Solaris mdb (Module Debugger), provide a scripting
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language interface. Scripting language interface provides easy-to-use, dynamically typed
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interface to access data structures from debuggee. dbx and mdb even allow user to write
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C/C++ modules to extend the scripting language commands.
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</p>
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<p>
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SA provides SOQL - Simple Object Query Language -- a SQL-like query language to access
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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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But to use this interface, user has to learn scripting interface of multiple debugger back-ends such as dbx, windbg.
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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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Higher level SA services are not available through scripting interface.
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</p>
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<p>
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<b>jsdb -- JavaScript Debugger</b> attempts to provide JavaScript interface to SA.
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jsdb provides
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<ul>
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<li>high-level hotspot (and SA) independent scripting interface
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<li>low-level SA-aware scripting interface.
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</ul>
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</p>
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<h2>High level interface (Java State)</h2>
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<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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<a href="http://www.mozilla.org/rhino/">Mozilla's Rhino JavaScript Engine</a>.
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This command line utility attaches to Java process or core file or remote debug server and waits for user input.
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This shell supports the following global functions and objects in addition to the standard JavaScript functions and
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objects:
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<h3>jdsb globals</h3>
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<table border="1">
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<tr>
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<th>Function/Variable</th>
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<th>Description</th>
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</tr>
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<tr>
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<td>
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address(jobject)
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</td>
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<td>
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function that returns the address of the Java object as a string
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</td>
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</tr>
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<td>
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classof(jobject)
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</td>
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<td>
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function that returns the JavaScript object that represents class object of the Java object
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</td>
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</tr>
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<td>
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dumpClass(jclass,[dir])
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</td>
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<td>
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function that writes .class for the given Java Class. Optionally (second arg) accepts the directory where the
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.class has to be written.
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</td>
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</tr>
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<td>
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help()
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</td>
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<td>
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function that prints help message for global functions and objects
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</td>
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</tr>
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<tr>
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<td>
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identityHash(jobject)
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</td>
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<td>
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function that returns the identity hashCode of the Java object
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</td>
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</tr>
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<tr>
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<td>
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mirror(jobject)
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</td>
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<td>
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function that returns a local mirror of the Java object.
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</td>
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</tr>
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<tr>
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<td>
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load([file1, file2,...])
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</td>
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<td>
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function that loads zero or more JavaScript file(s). With no arguments, reads <stdin> for
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JavaScript code.
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</td>
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</tr>
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<tr>
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<td>
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object(string)
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</td>
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<td>
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function that converts a string address into Java object
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</td>
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</tr>
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<tr>
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<td>
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owner(jobject)
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</td>
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<td>
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function that returns the owner thread of this monitor or null
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</td>
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</tr>
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<tr>
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<td>
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sizeof(jobject)
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</td>
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<td>
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function that returns the size of Java object in bytes
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</td>
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</tr>
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<tr>
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<td>
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staticof(jclass, field)
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</td>
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<td>
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function that returns the value of given field of the given Java class
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</td>
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</tr>
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<tr>
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<td>
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print(expr1, expr2,...)
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</td>
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<td>
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function that prints zero or more JavaScript expressions after converting those as strings
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</td>
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</tr>
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<tr>
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<td>
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println(expr1, expr2..)
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</td>
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<td>
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function that same as print, but prints a newline at the end
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</td>
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</tr>
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<tr>
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<td>
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read([prompt])
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</td>
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<td>
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function that reads a single line from standard input
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</td>
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</tr>
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<tr>
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<td>
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quit()
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</td>
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<td>
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function that quits the interactive load call as well as the shell
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</td>
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</tr>
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<tr>
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<td>
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jvm
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</td>
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<td>
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variable -- a JavaScript object that represents the target jvm that is being debugged
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</td>
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</tr>
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</table>
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<h3>jvm object</h3>
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<p>
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jvm object supports the following read-only properties.
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</p>
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<table border="1">
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<tr>
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<th>
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Property name
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</th>
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<th>
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Description
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</th>
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</tr>
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<tr>
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<td>
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threads
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</td>
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<td>
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array of Java threads from the debuggee
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</td>
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</tr>
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<tr>
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<td>
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heap
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</td>
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<td>
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object representing the heap of the debuggee
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</td>
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</tr>
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<tr>
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<td>
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type
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</td>
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<td>
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string value that is either "Server" or "Client" or "Core" -- the flavour of debuggee VM
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</td>
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</tr>
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<tr>
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<td>
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bootClassPath
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</td>
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<td>
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string value of bootclasspath of the debuggee
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</td>
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</tr>
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<tr>
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<td>
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cpu
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</td>
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<td>
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string value of cpu on which the debuggee runs/ran
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</td>
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</tr>
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<tr>
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<td>
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sysProps
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</td>
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<td>
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name-value pairs (JavaScript associative array) of Java System properties of the debuggee
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</td>
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</tr>
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<tr>
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<td>
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addressSize
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</td>
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<td>
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int value -- 32 for 32 bit debuggee, 64 for 64 bit debuggee
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</td>
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</tr>
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<tr>
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<td>
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os
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</td>
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<td>
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string value of OS on which the debuggee runs/ran
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</td>
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</tr>
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<tr>
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<td>
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buildInfo
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</td>
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<td>
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internal build info string from debuggee
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</td>
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</tr>
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<tr>
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<td>
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flags
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</td>
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<td>
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name-value pairs (JavaScript associative array) of JVM command line flags of the debuggee
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</td>
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</tr>
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<tr>
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<td>
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classPath
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</td>
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<td>
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string value of classpath of the debuggee
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</td>
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</tr>
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<tr>
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<td>
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userDir
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</td>
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<td>
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string value of user.dir System property of the debuggee
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</td>
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</tr>
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</table>
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<h3>heap object</h3>
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<p>
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heap object represents Java heap of the debuggee VM
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</p>
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<table border="1">
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<tr>
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<th>
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Function or property name
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</th>
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<th>
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Description
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</th>
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</tr>
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<tr>
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<td>
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capacity
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</td>
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<td>
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byte size of capacity of the heap
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</td>
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</tr>
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<tr>
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<td>
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used
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</td>
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<td>
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byte size of used portion (of live objects) of the heap
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</td>
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</tr>
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<tr>
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<td>
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forEachObject(func, [class], [include subtypes -- true|false])
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</td>
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<td>
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This function accepts a callback function 'func' and optionally class name and boolean arguments.
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This function calls the callback for each Java object in the debuggee's heap. The optional class
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argument may be used to receive objects of given class only. The third arguments specifies whether
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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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and and that of the third argument is true. i.e., by default all objects are included.
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</td>
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</tr>
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<tr>
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<td>
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forEachClass(func, [initiating loader -- true|false])
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</td>
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<td>
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This function accepts a callback function 'func'. This function iterates through the classes of the debuggee and calls the
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callback for each class. The second parameter tells whether to pass initiating loader to the iterator callback or not.
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</td>
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</tr>
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</table>
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<h3>Accessing Java objects and arrays in script</h3>
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<p>
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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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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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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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accessed by a[n].
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</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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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.
|
|
|
393 |
</p>
|
|
|
394 |
|
|
|
395 |
<h3>thread object</h3>
|
|
|
396 |
|
|
|
397 |
|
|
|
398 |
<p>
|
|
|
399 |
In addition to the fields of java.lang.Thread (or subclass) fields, thread objects have two additional properties.
|
|
|
400 |
|
|
|
401 |
<ul>
|
|
|
402 |
<li>frames -- array of stack frame objects
|
|
|
403 |
<li>monitors -- array of monitor objects owned by the thread
|
|
|
404 |
</ul>
|
|
|
405 |
|
|
|
406 |
</p>
|
|
|
407 |
|
|
|
408 |
<h3>stack frame object</h3>
|
|
|
409 |
|
|
|
410 |
<table border="1">
|
|
|
411 |
<tr>
|
|
|
412 |
<th>
|
|
|
413 |
Property name
|
|
|
414 |
</th>
|
|
|
415 |
<th>
|
|
|
416 |
Description
|
|
|
417 |
</th>
|
|
|
418 |
</tr>
|
|
|
419 |
<td>
|
|
|
420 |
thisObject
|
|
|
421 |
</td>
|
|
|
422 |
<td>
|
|
|
423 |
Object representing 'this' of the current frame [will be null for static methods]
|
|
|
424 |
</td>
|
|
|
425 |
</tr>
|
|
|
426 |
<tr>
|
|
|
427 |
<td>
|
|
|
428 |
locals
|
|
|
429 |
</td>
|
|
|
430 |
<td>
|
|
|
431 |
name-value pairs of local variables [JavaScript associative array]
|
|
|
432 |
</td>
|
|
|
433 |
</tr>
|
|
|
434 |
<tr>
|
|
|
435 |
<td>
|
|
|
436 |
line
|
|
|
437 |
</td>
|
|
|
438 |
<td>
|
|
|
439 |
Java source line number at which the frame is executing
|
|
|
440 |
</td>
|
|
|
441 |
</tr>
|
|
|
442 |
<tr>
|
|
|
443 |
<td>
|
|
|
444 |
bci
|
|
|
445 |
</td>
|
|
|
446 |
<td>
|
|
|
447 |
byte code index of the bytecode that the frame is executing
|
|
|
448 |
</td>
|
|
|
449 |
</tr>
|
|
|
450 |
<tr>
|
|
|
451 |
<td>
|
|
|
452 |
thread
|
|
|
453 |
</td>
|
|
|
454 |
<td>
|
|
|
455 |
thread to which this frame belongs
|
|
|
456 |
</td>
|
|
|
457 |
</tr>
|
|
|
458 |
<tr>
|
|
|
459 |
<td>
|
|
|
460 |
method
|
|
|
461 |
</td>
|
|
|
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>
|