📄 dynasm_features.html
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"><html><head><title>DynASM Features</title><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><meta name="Author" content="Mike Pall"><meta name="Copyright" content="Copyright (C) 2005-2007, Mike Pall"><meta name="Language" content="en"><link rel="stylesheet" type="text/css" href="bluequad.css" media="screen"><link rel="stylesheet" type="text/css" href="bluequad-print.css" media="print"></head><body><div id="site"><a href="http://luajit.org/"><span>Lua<span id="logo">JIT</span></span></a></div><div id="head"><h1>DynASM Features</h1></div><div id="nav"><ul><li><a href="index.html">Index</a></li><li><a href="luajit.html">LuaJIT</a><ul><li><a href="luajit_features.html">Features</a></li><li><a href="luajit_install.html">Installation</a></li><li><a href="luajit_run.html">Running</a></li><li><a href="luajit_api.html">API Extensions</a></li><li><a href="luajit_intro.html">Introduction</a></li><li><a href="luajit_performance.html">Performance</a></li><li><a href="luajit_debug.html">Debugging</a></li><li><a href="luajit_changes.html">Changes</a></li></ul></li><li><a href="coco.html">Coco</a><ul><li><a href="coco_portability.html">Portability</a></li><li><a href="coco_api.html">API Extensions</a></li><li><a href="coco_changes.html">Changes</a></li></ul></li><li><a href="dynasm.html">DynASM</a><ul><li><a class="current" href="dynasm_features.html">Features</a></li><li><a href="dynasm_examples.html">Examples</a></li></ul></li><li><a href="http://luajit.org/download.html">Download <span class="ext">»</span></a></li></ul></div><div id="main"><h2>DynASM Toolchain Features</h2><ul><li>DynASM is a pre-processing assembler.</li><li>DynASM converts mixed C/Assembler source to plain C code.</li><li>The primary knowledge about instruction names, operand modes,registers, opcodes and how to encode them is <em>only</em>needed in the pre-processor.</li><li>The generated C code is extremely small and fast.</li><li>A tiny embeddable C library helps with the process of dynamicallyassembling, relocating and linking machine code.</li><li>There are no outside dependencies on other tools (such asstand-alone assemblers or linkers).</li><li>Internal consistency checks catch runtime errors(e.g. undefined labels).</li><li>The toolchain is split into a portable subset andCPU-specific modules.</li><li>DynASM itself (the pre-processor) is written in Lua.</li><li>There is no machine-dependency for the pre-processor itself.It should work everywhere you can get Lua 5.1 up and running(i.e. Linux, *BSD, Solaris, Windows, ... you name it).</li></ul><h2>DynASM Assembler Features</h2><ul><li>C code and assembler code can be freely mixed.<em>Readable</em>, too.</li><li>All the usual syntax for instructions and operand modesyou come to expect from a standard assembler.</li><li>Access to C variables and CPP defines in assembler statements.</li><li>Access to C structures and unions via type mapping.</li><li>Convenient shortcuts for accessing C structures.</li><li>Local and global labels.</li><li>Numbered labels (e.g. for mapping bytecode instruction numbers).</li><li>Multiple code sections (e.g. for tailcode).</li><li>Defines/substitutions (inline and from command line).</li><li>Conditionals (translation time) with proper nesting.</li><li>Macros with parameters.</li><li>Macros can mix assembler statements and C code.</li><li>Captures (output diversion for code reordering).</li><li>Simple and extensible template system for instruction definitions.</li></ul><h2>Restrictions</h2><p>Currently only a subset of x86 (i386+) instructions is supported.Unsupported instructions are either not usable in user-mode orare slow on modern CPUs (i.e. not suited for a code generator).SSE, SSE2, SSE3 and SSSE3 are fully supported. MMX is not supported.</p><p>The whole toolchain has been designed to support multiple CPUarchitectures. As LuaJIT gets support for more architectures,DynASM will be extended with new CPU-specific modules.</p><p>The assembler itself will be extended with more features on anas-needed basis. E.g. I'm thinking about vararg macros.</p><p>Note that runtime conditionals are not really needed, since you canjust use plain C code for that (and LuaJIT does this <em>a lot</em>).It's not going to be more (time-) efficient if conditionals are doneby the embedded C library (maybe a bit more space-efficient).</p><br class="flush"></div><div id="foot"><hr class="hide">Copyright © 2005-2007 Mike Pall<span class="noprint">·<a href="contact.html">Contact</a></span></div></body></html>⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -