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authorDavid Walter Seikel2014-01-13 21:08:31 +1000
committerDavid Walter Seikel2014-01-13 21:08:31 +1000
commit637177eb1397ef1800027bccd50dbdc1af29a15b (patch)
tree3670a48303d05fceb8bf3ec4ee2901b72fe62d4d /libraries/luajit-2.0/doc/faq.html
parentUpdate Irrlicht to 1.8.1. Include actual change markers this time. lol (diff)
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Remove LuaJIT source, we can use packaged LuaJIT 2.0 release now.
Also some cleanups related to the other library removals.
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1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
2<html>
3<head>
4<title>Frequently Asked Questions (FAQ)</title>
5<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
6<meta name="Author" content="Mike Pall">
7<meta name="Copyright" content="Copyright (C) 2005-2011, Mike Pall">
8<meta name="Language" content="en">
9<link rel="stylesheet" type="text/css" href="bluequad.css" media="screen">
10<link rel="stylesheet" type="text/css" href="bluequad-print.css" media="print">
11<style type="text/css">
12dd { margin-left: 1.5em; }
13</style>
14</head>
15<body>
16<div id="site">
17<a href="http://luajit.org"><span>Lua<span id="logo">JIT</span></span></a>
18</div>
19<div id="head">
20<h1>Frequently Asked Questions (FAQ)</h1>
21</div>
22<div id="nav">
23<ul><li>
24<a href="luajit.html">LuaJIT</a>
25<ul><li>
26<a href="install.html">Installation</a>
27</li><li>
28<a href="running.html">Running</a>
29</li></ul>
30</li><li>
31<a href="extensions.html">Extensions</a>
32<ul><li>
33<a href="ext_ffi.html">FFI Library</a>
34<ul><li>
35<a href="ext_ffi_tutorial.html">FFI Tutorial</a>
36</li><li>
37<a href="ext_ffi_api.html">ffi.* API</a>
38</li><li>
39<a href="ext_ffi_semantics.html">FFI Semantics</a>
40</li></ul>
41</li><li>
42<a href="ext_jit.html">jit.* Library</a>
43</li><li>
44<a href="ext_c_api.html">Lua/C API</a>
45</li></ul>
46</li><li>
47<a href="status.html">Status</a>
48<ul><li>
49<a href="changes.html">Changes</a>
50</li></ul>
51</li><li>
52<a class="current" href="faq.html">FAQ</a>
53</li><li>
54<a href="http://luajit.org/performance.html">Performance <span class="ext">&raquo;</span></a>
55</li><li>
56<a href="http://luajit.org/download.html">Download <span class="ext">&raquo;</span></a>
57</li></ul>
58</div>
59<div id="main">
60<dl>
61<dt>Q: Where can I learn more about Lua and LuaJIT?</dt>
62<dd>
63<ul style="padding: 0;">
64<li>The <a href="http://lua.org"><span class="ext">&raquo;</span>&nbsp;main Lua.org site</a> has complete
65<a href="http://www.lua.org/docs.html"><span class="ext">&raquo;</span>&nbsp;documentation</a> of the language
66and links to books and papers about Lua.</li>
67<li>The community-managed <a href="http://lua-users.org/wiki/"><span class="ext">&raquo;</span>&nbsp;Lua Wiki</a>
68has information about diverse topics.</li>
69<li>The primary source of information for the latest developments surrounding
70Lua is the <a href="http://www.lua.org/lua-l.html"><span class="ext">&raquo;</span>&nbsp;Lua mailing list</a>.
71You can check out the <a href="http://lua-users.org/lists/lua-l/"><span class="ext">&raquo;</span>&nbsp;mailing
72list archive</a> or
73<a href="http://bazar2.conectiva.com.br/mailman/listinfo/lua"><span class="ext">&raquo;</span>&nbsp;subscribe</a>
74to the list (you need to be subscribed before posting).<br>
75This is also the place where announcements and discussions about LuaJIT
76take place.</li>
77</ul>
78</dl>
79
80<dl>
81<dt>Q: Where can I learn more about the compiler technology used by LuaJIT?</dt>
82<dd>
83I'm planning to write more documentation about the internals of LuaJIT.
84In the meantime, please use the following Google Scholar searches
85to find relevant papers:<br>
86Search for: <a href="http://scholar.google.com/scholar?q=Trace+Compiler"><span class="ext">&raquo;</span>&nbsp;Trace Compiler</a><br>
87Search for: <a href="http://scholar.google.com/scholar?q=JIT+Compiler"><span class="ext">&raquo;</span>&nbsp;JIT Compiler</a><br>
88Search for: <a href="http://scholar.google.com/scholar?q=Dynamic+Language+Optimizations"><span class="ext">&raquo;</span>&nbsp;Dynamic Language Optimizations</a><br>
89Search for: <a href="http://scholar.google.com/scholar?q=SSA+Form"><span class="ext">&raquo;</span>&nbsp;SSA Form</a><br>
90Search for: <a href="http://scholar.google.com/scholar?q=Linear+Scan+Register+Allocation"><span class="ext">&raquo;</span>&nbsp;Linear Scan Register Allocation</a><br>
91Here is a list of the <a href="http://article.gmane.org/gmane.comp.lang.lua.general/58908"><span class="ext">&raquo;</span>&nbsp;innovative features in LuaJIT</a>.<br>
92And, you know, reading the source is of course the only way to enlightenment. :-)
93</dd>
94</dl>
95
96<dl>
97<dt>Q: Why do I get this error: "attempt to index global 'arg' (a nil value)"?<br>
98Q: My vararg functions fail after switching to LuaJIT!</dt>
99<dd>LuaJIT is compatible to the Lua 5.1 language standard. It doesn't
100support the implicit <tt>arg</tt> parameter for old-style vararg
101functions from Lua 5.0.<br>Please convert your code to the
102<a href="http://www.lua.org/manual/5.1/manual.html#2.5.9"><span class="ext">&raquo;</span>&nbsp;Lua 5.1
103vararg syntax</a>.</dd>
104</dl>
105
106<dl>
107<dt>Q: Why do I get this error: "bad FPU precision"?<br>
108<dt>Q: I get weird behavior after initializing Direct3D.<br>
109<dt>Q: Some FPU operations crash after I load a Delphi DLL.<br>
110</dt>
111<dd>
112
113DirectX/Direct3D (up to version 9) sets the x87 FPU to single-precision
114mode by default. This violates the Windows ABI and interferes with the
115operation of many programs &mdash; LuaJIT is affected, too. Please make
116sure you always use the <tt>D3DCREATE_FPU_PRESERVE</tt> flag when
117initializing Direct3D.<br>
118
119Direct3D version 10 or higher do not show this behavior anymore.
120Consider testing your application with older versions, too.<br>
121
122Similarly, the Borland/Delphi runtime modifies the FPU control word and
123enables FP exceptions. Of course this violates the Windows ABI, too.
124Please check the Delphi docs for the Set8087CW method.
125
126</dl>
127
128<dl>
129<dt>Q: Sometimes Ctrl-C fails to stop my Lua program. Why?</dt>
130<dd>The interrupt signal handler sets a Lua debug hook. But this is
131currently ignored by compiled code (this will eventually be fixed). If
132your program is running in a tight loop and never falls back to the
133interpreter, the debug hook never runs and can't throw the
134"interrupted!" error.<br> In the meantime you have to press Ctrl-C
135twice to get stop your program. That's similar to when it's stuck
136running inside a C function under the Lua interpreter.</dd>
137</dl>
138
139<dl>
140<dt>Q: Why doesn't my favorite power-patch for Lua apply against LuaJIT?</dt>
141<dd>Because it's a completely redesigned VM and has very little code
142in common with Lua anymore. Also, if the patch introduces changes to
143the Lua semantics, these would need to be reflected everywhere in the
144VM, from the interpreter up to all stages of the compiler.<br> Please
145use only standard Lua language constructs. For many common needs you
146can use source transformations or use wrapper or proxy functions.
147The compiler will happily optimize away such indirections.</dd>
148</dl>
149
150<dl>
151<dt>Q: Lua runs everywhere. Why doesn't LuaJIT support my CPU?</dt>
152<dd>Because it's a compiler &mdash; it needs to generate native
153machine code. This means the code generator must be ported to each
154architecture. And the fast interpreter is written in assembler and
155must be ported, too. This is quite an undertaking.<br>
156The <a href="install.html">install documentation</a> shows the supported
157architectures. Other architectures will follow based on sufficient user
158demand and/or sponsoring.</dd>
159</dl>
160
161<dl>
162<dt>Q: When will feature X be added? When will the next version be released?</dt>
163<dd>When it's ready.<br>
164C'mon, it's open source &mdash; I'm doing it on my own time and you're
165getting it for free. You can either contribute a patch or sponsor
166the development of certain features, if they are important to you.
167</dd>
168</dl>
169<br class="flush">
170</div>
171<div id="foot">
172<hr class="hide">
173Copyright &copy; 2005-2011 Mike Pall
174<span class="noprint">
175&middot;
176<a href="contact.html">Contact</a>
177</span>
178</div>
179</body>
180</html>
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