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) };