doc/status.html


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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<title>Status &amp; Roadmap</title>
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<meta name="Author" content="Mike Pall">
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<a href="http://luajit.org"><span>Lua<span id="logo">JIT</span></span></a>
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<h1>Status &amp; Roadmap</h1>
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<p>
The <span style="color: #0000c0;">LuaJIT&nbsp;1.x</span> series represents
the current <span style="color: #0000c0;">stable branch</span>.
Only a single bug has been discovered in the last three years. So, if
you need a rock-solid VM, you are encouraged to fetch the latest
release of LuaJIT 1.x from the <a href="http://luajit.org/download.html"><span class="ext">&raquo;</span>&nbsp;Download</a>
page.
</p>
<p>
<span style="color: #c00000;">LuaJIT&nbsp;2.0</span> is the currently active
<span style="color: #c00000;">development branch</span> in beta test.
It has <a href="http://luajit.org/performance.html"><span class="ext">&raquo;</span>&nbsp;much better performance</a> than
LuaJIT&nbsp;1.x and runs on many more platforms and architectures.
It's nearing a stable release, so you should definitely
start to evaluate it for new projects right now.
</p>

<h2>Current Status</h2>
<p>
LuaJIT ought to run all Lua&nbsp;5.1-compatible source code just fine.
It's considered a serious bug if the VM crashes or produces unexpected
results &mdash; please report this.
</p>
<p>
Known incompatibilities and issues in LuaJIT&nbsp;2.0:
</p>
<ul>
<li>
There are some differences in <b>implementation-defined</b> behavior.
These either have a good reason, are arbitrary design choices
or are due to quirks in the VM. The latter cases may get fixed if a
demonstrable need is shown.
</li>
<li>
The Lua <b>debug API</b> is missing a couple of features (return
hooks for non-Lua functions) and shows slightly different behavior
in LuaJIT (no per-coroutine hooks, no tail call counting).
</li>
<li>
Some checks are missing in the JIT-compiled code for obscure situations
with <b>open upvalues aliasing</b> one of the SSA slots later on (or
vice versa). Bonus points, if you can find a real world test case for
this.
</li>
<li>
Currently some <b>out-of-memory</b> errors from <b>on-trace code</b> are not
handled correctly. The error may fall through an on-trace
<tt>pcall</tt> or it may be passed on to the function set with
<tt>lua_atpanic</tt> on x64. This issue will be fixed in LuaJIT&nbsp;2.1.
</li>
</ul>

<h2>Roadmap</h2>
<p>
Please refer to the
<a href="http://www.freelists.org/post/luajit/LuaJIT-Roadmap-20122013"><span class="ext">&raquo;</span>&nbsp;LuaJIT
Roadmap 2012/2013</a> for details.
</p>
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Copyright &copy; 2005-2012 Mike Pall
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