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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>DynASM Features</title>
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6<meta name="Author" content="Mike Pall">
7<meta name="Copyright" content="Copyright (C) 2005-2011, Mike Pall">
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13<div id="site">
14<a href="http://luajit.org/"><span>Lua<span id="logo">JIT</span></span></a>
15</div>
16<div id="head">
17<h1>DynASM Features</h1>
18</div>
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51<a href="dynasm.html">DynASM</a>
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53<a class="current" href="dynasm_features.html">Features</a>
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61<div id="main">
62<h2>DynASM Toolchain Features</h2>
63<ul>
64<li>DynASM is a pre-processing assembler.</li>
65<li>DynASM converts mixed C/Assembler source to plain C&nbsp;code.</li>
66<li>The primary knowledge about instruction names, operand modes,
67registers, opcodes and how to encode them is <em>only</em>
68needed in the pre-processor.</li>
69<li>The generated C&nbsp;code is extremely small and fast.</li>
70<li>A tiny embeddable C&nbsp;library helps with the process of dynamically
71assembling, relocating and linking machine code.</li>
72<li>There are no outside dependencies on other tools (such as
73stand-alone assemblers or linkers).</li>
74<li>Internal consistency checks catch runtime errors
75(e.g. undefined labels).</li>
76<li>The toolchain is split into a portable subset and
77CPU-specific modules.</li>
78<li>DynASM itself (the pre-processor) is written in Lua.</li>
79<li>There is no machine-dependency for the pre-processor itself.
80It should work everywhere you can get Lua 5.1 up and running
81(i.e. Linux, *BSD, Solaris, Windows, ... you name it).</li>
82</ul>
83
84<h2>DynASM Assembler Features</h2>
85<ul>
86<li>C&nbsp;code and assembler code can be freely mixed.
87<em>Readable</em>, too.</li>
88<li>All the usual syntax for instructions and operand modes
89you come to expect from a standard assembler.</li>
90<li>Access to C&nbsp;variables and CPP defines in assembler statements.</li>
91<li>Access to C&nbsp;structures and unions via type mapping.</li>
92<li>Convenient shortcuts for accessing C&nbsp;structures.</li>
93<li>Local and global labels.</li>
94<li>Numbered labels (e.g. for mapping bytecode instruction numbers).</li>
95<li>Multiple code sections (e.g. for tailcode).</li>
96<li>Defines/substitutions (inline and from command line).</li>
97<li>Conditionals (translation time) with proper nesting.</li>
98<li>Macros with parameters.</li>
99<li>Macros can mix assembler statements and C&nbsp;code.</li>
100<li>Captures (output diversion for code reordering).</li>
101<li>Simple and extensible template system for instruction definitions.</li>
102</ul>
103
104<h2>Restrictions</h2>
105<p>
106Currently only a subset of x86 (i386+) instructions is supported.
107Unsupported instructions are either not usable in user-mode or
108are slow on modern CPUs (i.e. not suited for a code generator).
109SSE, SSE2, SSE3 and SSSE3 are fully supported. MMX is not supported.
110</p>
111<p>
112The whole toolchain has been designed to support multiple CPU
113architectures. As LuaJIT gets support for more architectures,
114DynASM will be extended with new CPU-specific modules.
115</p>
116<p>
117The assembler itself will be extended with more features on an
118as-needed basis. E.g. I'm thinking about vararg macros.
119</p>
120<p>
121Note that runtime conditionals are not really needed, since you can
122just use plain C&nbsp;code for that (and LuaJIT does this <em>a lot</em>).
123It's not going to be more (time-) efficient if conditionals are done
124by the embedded C&nbsp;library (maybe a bit more space-efficient).
125</p>
126
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