of the JIT compiler.</li>
<li id="j_dump"><tt>-jdump</tt> &mdash; Dumps the code and structures used in various compiler stages.</li>
<li id="j_p"><tt>-jp</tt> &mdash; Start the <a href="ext_profiler.html">integrated profiler</a>.</li>
</ul>
<p>
The <tt>-jv</tt> and <tt>-jdump</tt> commands are extension modules
written in Lua. They are mainly used for debugging the JIT compiler
itself. For a description of their options and output format, please
read the comment block at the start of their source.
They can