forked from mia/Aegisub
124 lines
3.8 KiB
HTML
124 lines
3.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<title>Status</title>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name="Author" content="Mike Pall">
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<meta name="Copyright" content="Copyright (C) 2005-2017, Mike Pall">
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<meta name="Language" content="en">
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<link rel="stylesheet" type="text/css" href="bluequad.css" media="screen">
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<link rel="stylesheet" type="text/css" href="bluequad-print.css" media="print">
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<style type="text/css">
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ul li { padding-bottom: 0.3em; }
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</style>
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</head>
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<body>
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<div id="site">
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<a href="http://luajit.org"><span>Lua<span id="logo">JIT</span></span></a>
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</div>
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<div id="head">
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<h1>Status</h1>
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</div>
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<div id="nav">
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<ul><li>
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<a href="luajit.html">LuaJIT</a>
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<ul><li>
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<a href="http://luajit.org/download.html">Download <span class="ext">»</span></a>
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</li><li>
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<a href="install.html">Installation</a>
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</li><li>
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<a href="running.html">Running</a>
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</li></ul>
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</li><li>
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<a href="extensions.html">Extensions</a>
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<ul><li>
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<a href="ext_ffi.html">FFI Library</a>
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<ul><li>
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<a href="ext_ffi_tutorial.html">FFI Tutorial</a>
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</li><li>
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<a href="ext_ffi_api.html">ffi.* API</a>
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</li><li>
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<a href="ext_ffi_semantics.html">FFI Semantics</a>
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</li></ul>
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</li><li>
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<a href="ext_jit.html">jit.* Library</a>
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</li><li>
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<a href="ext_c_api.html">Lua/C API</a>
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</li><li>
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<a href="ext_profiler.html">Profiler</a>
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</li></ul>
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</li><li>
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<a class="current" href="status.html">Status</a>
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<ul><li>
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<a href="changes.html">Changes</a>
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</li></ul>
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</li><li>
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<a href="faq.html">FAQ</a>
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</li><li>
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<a href="http://luajit.org/performance.html">Performance <span class="ext">»</span></a>
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</li><li>
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<a href="http://wiki.luajit.org/">Wiki <span class="ext">»</span></a>
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</li><li>
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<a href="http://luajit.org/list.html">Mailing List <span class="ext">»</span></a>
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</li></ul>
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</div>
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<div id="main">
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<p>
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<span style="color: #0000c0;">LuaJIT 2.0</span> is the current
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<span style="color: #0000c0;">stable branch</span>. This branch is in
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feature-freeze — new features will only be added to LuaJIT 2.1.
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</p>
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<h2>Current Status</h2>
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<p>
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LuaJIT ought to run all Lua 5.1-compatible source code just fine.
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It's considered a serious bug if the VM crashes or produces unexpected
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results — please report this.
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</p>
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<p>
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Known incompatibilities and issues in LuaJIT 2.0:
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</p>
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<ul>
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<li>
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There are some differences in <b>implementation-defined</b> behavior.
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These either have a good reason, are arbitrary design choices
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or are due to quirks in the VM. The latter cases may get fixed if a
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demonstrable need is shown.
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</li>
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<li>
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The Lua <b>debug API</b> is missing a couple of features (return
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hooks for non-Lua functions) and shows slightly different behavior
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in LuaJIT (no per-coroutine hooks, no tail call counting).
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</li>
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<li>
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Currently some <b>out-of-memory</b> errors from <b>on-trace code</b> are not
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handled correctly. The error may fall through an on-trace
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<tt>pcall</tt> or it may be passed on to the function set with
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<tt>lua_atpanic</tt> on x64. This issue will be fixed with the new
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garbage collector.
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</li>
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<li>
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LuaJIT on 64 bit systems provides a <b>limited range</b> of 47 bits for the
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<b>legacy <tt>lightuserdata</tt></b> data type.
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This is only relevant on x64 systems which use the negative part of the
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virtual address space in user mode, e.g. Solaris/x64, and on ARM64 systems
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configured with a 48 bit or 52 bit VA.
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Avoid using <tt>lightuserdata</tt> to hold pointers that may point outside
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of that range, e.g. variables on the stack. In general, avoid this data
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type for new code and replace it with (much more performant) FFI bindings.
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FFI cdata pointers can address the full 64 bit range.
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</li>
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</ul>
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<br class="flush">
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</div>
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<div id="foot">
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<hr class="hide">
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Copyright © 2005-2017 Mike Pall
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<span class="noprint">
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·
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<a href="contact.html">Contact</a>
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</span>
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</div>
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</body>
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</html>
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