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JavaScript - DTracing JavaScript
There scripts trace the JavaScript programming language, and require a
browser to be built with the DTrace JavaScript provider.
The DTrace JavaScript provider was originally written by Brendan Gregg,
and later developed as part of a Mozilla DTrace provider suite by
engineers from both Sun and Mozilla. It currently exists as patches
to the Mozilla source tree and requires building from source to get
working; it may be integrated into Solaris builds by default in the
future. To download the current patches and instructions, visit,
http://www.opensolaris.org/os/project/mozilla-dtrace/
A rough guide for the process is,
1. Download the Mozilla source
http://developer.mozilla.org/en/docs/Mozilla_Source_Code_Via_CVS
2. Download the Mozilla DTrace framework patch, and apply
https://bugzilla.mozilla.org/show_bug.cgi?id=370906
3. Download the JavaScript DTrace provider patch, and apply
https://bugzilla.mozilla.org/show_bug.cgi?id=388564
4. Create a .mozconfig file (needed for compilation).
5. Setup various compilation environment vars (CC/CFLAGS/CXX/...)
6. autoconf
7. ./configure --enable-dtrace
8. gmake
See John Rice's instructions linked from the OpenSolaris page above
for details on steps 4-8.
Since the DTrace JavaScript provider may be developed further, there is a
chance that it has changed slightly by the time you are reading this,
causing these scripts to either break or behave oddly. Firstly, check for
newer versions of the DTraceToolkit; if it hasn't been updated and you need
to use these scripts immediately, then updating them shouldn't take
too long. The following was the state of the provider when these scripts
were written - check for changes and update the scripts accordingly,
provider javascript {
probe function-entry(file, class, func)
probe function-info(file, class, func, lineno, runfile, runlineno)
probe function-args(file, class, func, argc, argv, argv0, argv1,
argv2, argv3, argv4)
probe function-rval(file, class, func, lineno, rval, rval0)
probe function-return(file, class, func)
probe object-create-start(file, class)
probe object-create(file, class, *object, rlineno)
probe object-create-done(file, class)
probe object-finalize(NULL, class, *object)
probe execute-start(file, lineno)
probe execute-done(file, lineno)
};
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