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   4 <title>Status &amp; Roadmap</title>
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  17 <a href="http://luajit.org"><span>Lua<span id="logo">JIT</span></span></a>
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  20 <h1>Status &amp; Roadmap</h1>
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  24 <a href="luajit.html">LuaJIT</a>
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  64 <p>
  65 The <span style="color: #0000c0;">LuaJIT&nbsp;1.x</span> series represents
  66 the current <span style="color: #0000c0;">stable branch</span>.
  67 Only a single bug has been discovered in the last three years. So, if
  68 you need a rock-solid VM, you are encouraged to fetch the latest
  69 release of LuaJIT 1.x from the <a href="http://luajit.org/download.html"><span class="ext">&raquo;</span>&nbsp;Download</a>
  70 page.
  71 </p>
  72 <p>
  73 <span style="color: #c00000;">LuaJIT&nbsp;2.0</span> is the currently active
  74 <span style="color: #c00000;">development branch</span> in beta test.
  75 It has <a href="http://luajit.org/performance.html"><span class="ext">&raquo;</span>&nbsp;much better performance</a> than
  76 LuaJIT&nbsp;1.x and runs on many more platforms and architectures.
  77 It's nearing a stable release, so you should definitely
  78 start to evaluate it for new projects right now.
  79 </p>
  80
  81 <h2>Current Status</h2>
  82 <p>
  83 LuaJIT ought to run all Lua&nbsp;5.1-compatible source code just fine.
  84 It's considered a serious bug if the VM crashes or produces unexpected
  85 results &mdash; please report this.
  86 </p>
  87 <p>
  88 Known incompatibilities and issues in LuaJIT&nbsp;2.0:
  89 </p>
  90 <ul>
  91 <li>
  92 There are some differences in <b>implementation-defined</b> behavior.
  93 These either have a good reason, are arbitrary design choices
  94 or are due to quirks in the VM. The latter cases may get fixed if a
  95 demonstrable need is shown.
  96 </li>
  97 <li>
  98 The Lua <b>debug API</b> is missing a couple of features (return
  99 hooks for non-Lua functions) and shows slightly different behavior
 100 in LuaJIT (no per-coroutine hooks, no tail call counting).
 101 </li>
 102 <li>
 103 Some checks are missing in the JIT-compiled code for obscure situations
 104 with <b>open upvalues aliasing</b> one of the SSA slots later on (or
 105 vice versa). Bonus points, if you can find a real world test case for
 106 this.
 107 </li>
 108 <li>
 109 Currently some <b>out-of-memory</b> errors from <b>on-trace code</b> are not
 110 handled correctly. The error may fall through an on-trace
 111 <tt>pcall</tt> or it may be passed on to the function set with
 112 <tt>lua_atpanic</tt> on x64. This issue will be fixed in LuaJIT&nbsp;2.1.
 113 </li>
 114 </ul>
 115
 116 <h2>Roadmap</h2>
 117 <p>
 118 Please refer to the
 119 <a href="http://www.freelists.org/post/luajit/LuaJIT-Roadmap-20122013"><span class="ext">&raquo;</span>&nbsp;LuaJIT
 120 Roadmap 2012/2013</a> for details.
 121 </p>
 122 <p>
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 128 Copyright &copy; 2005-2012 Mike Pall
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