1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<!-- This file documents the GNU Assembler "as". 4 5Copyright (C) 1991-2021 Free Software Foundation, Inc. 6 7Permission is granted to copy, distribute and/or modify this document 8under the terms of the GNU Free Documentation License, Version 1.3 9or any later version published by the Free Software Foundation; 10with no Invariant Sections, with no Front-Cover Texts, and with no 11Back-Cover Texts. A copy of the license is included in the 12section entitled "GNU Free Documentation License". 13 --> 14<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> 15<head> 16<title>Using as: Syntax</title> 17 18<meta name="description" content="Using as: Syntax"> 19<meta name="keywords" content="Using as: Syntax"> 20<meta name="resource-type" content="document"> 21<meta name="distribution" content="global"> 22<meta name="Generator" content="makeinfo"> 23<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 24<link href="index.html#Top" rel="start" title="Top"> 25<link href="AS-Index.html#AS-Index" rel="index" title="AS Index"> 26<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> 27<link href="index.html#Top" rel="up" title="Top"> 28<link href="Preprocessing.html#Preprocessing" rel="next" title="Preprocessing"> 29<link href="Z.html#Z" rel="previous" title="Z"> 30<style type="text/css"> 31<!-- 32a.summary-letter {text-decoration: none} 33blockquote.smallquotation {font-size: smaller} 34div.display {margin-left: 3.2em} 35div.example {margin-left: 3.2em} 36div.indentedblock {margin-left: 3.2em} 37div.lisp {margin-left: 3.2em} 38div.smalldisplay {margin-left: 3.2em} 39div.smallexample {margin-left: 3.2em} 40div.smallindentedblock {margin-left: 3.2em; font-size: smaller} 41div.smalllisp {margin-left: 3.2em} 42kbd {font-style:oblique} 43pre.display {font-family: inherit} 44pre.format {font-family: inherit} 45pre.menu-comment {font-family: serif} 46pre.menu-preformatted {font-family: serif} 47pre.smalldisplay {font-family: inherit; font-size: smaller} 48pre.smallexample {font-size: smaller} 49pre.smallformat {font-family: inherit; font-size: smaller} 50pre.smalllisp {font-size: smaller} 51span.nocodebreak {white-space:nowrap} 52span.nolinebreak {white-space:nowrap} 53span.roman {font-family:serif; font-weight:normal} 54span.sansserif {font-family:sans-serif; font-weight:normal} 55ul.no-bullet {list-style: none} 56--> 57</style> 58 59 60</head> 61 62<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> 63<a name="Syntax"></a> 64<div class="header"> 65<p> 66Next: <a href="Sections.html#Sections" accesskey="n" rel="next">Sections</a>, Previous: <a href="Invoking.html#Invoking" accesskey="p" rel="previous">Invoking</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p> 67</div> 68<hr> 69<a name="Syntax-1"></a> 70<h2 class="chapter">3 Syntax</h2> 71 72<a name="index-machine_002dindependent-syntax"></a> 73<a name="index-syntax_002c-machine_002dindependent"></a> 74<p>This chapter describes the machine-independent syntax allowed in a 75source file. <code>as</code> syntax is similar to what many other 76assemblers use; it is inspired by the BSD 4.2 77assembler, except that <code>as</code> does not assemble Vax bit-fields. 78</p> 79<table class="menu" border="0" cellspacing="0"> 80<tr><td align="left" valign="top">• <a href="Preprocessing.html#Preprocessing" accesskey="1">Preprocessing</a>:</td><td> </td><td align="left" valign="top">Preprocessing 81</td></tr> 82<tr><td align="left" valign="top">• <a href="Whitespace.html#Whitespace" accesskey="2">Whitespace</a>:</td><td> </td><td align="left" valign="top">Whitespace 83</td></tr> 84<tr><td align="left" valign="top">• <a href="Comments.html#Comments" accesskey="3">Comments</a>:</td><td> </td><td align="left" valign="top">Comments 85</td></tr> 86<tr><td align="left" valign="top">• <a href="Symbol-Intro.html#Symbol-Intro" accesskey="4">Symbol Intro</a>:</td><td> </td><td align="left" valign="top">Symbols 87</td></tr> 88<tr><td align="left" valign="top">• <a href="Statements.html#Statements" accesskey="5">Statements</a>:</td><td> </td><td align="left" valign="top">Statements 89</td></tr> 90<tr><td align="left" valign="top">• <a href="Constants.html#Constants" accesskey="6">Constants</a>:</td><td> </td><td align="left" valign="top">Constants 91</td></tr> 92</table> 93 94 95 96 97</body> 98</html> 99