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131 lines
5.8 KiB
HTML
131 lines
5.8 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled "GNU Free Documentation License".
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-->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Comments (Using as)</title>
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<meta name="description" content="Comments (Using as)">
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<meta name="keywords" content="Comments (Using as)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Syntax.html#Syntax" rel="up" title="Syntax">
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<link href="Symbol-Intro.html#Symbol-Intro" rel="next" title="Symbol Intro">
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<link href="Whitespace.html#Whitespace" rel="prev" title="Whitespace">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.indentedblock {margin-right: 0em}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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div.smallexample {margin-left: 3.2em}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smallformat {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Comments"></a>
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<div class="header">
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<p>
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Next: <a href="Symbol-Intro.html#Symbol-Intro" accesskey="n" rel="next">Symbol Intro</a>, Previous: <a href="Whitespace.html#Whitespace" accesskey="p" rel="prev">Whitespace</a>, Up: <a href="Syntax.html#Syntax" accesskey="u" rel="up">Syntax</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>
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</div>
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<hr>
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<a name="Comments-1"></a>
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<h3 class="section">3.3 Comments</h3>
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<a name="index-comments"></a>
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<p>There are two ways of rendering comments to <code>as</code>. In both
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cases the comment is equivalent to one space.
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</p>
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<p>Anything from ‘<samp>/*</samp>’ through the next ‘<samp>*/</samp>’ is a comment.
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This means you may not nest these comments.
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</p>
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<div class="smallexample">
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<pre class="smallexample">/*
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The only way to include a newline ('\n') in a comment
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is to use this sort of comment.
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*/
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/* This sort of comment does not nest. */
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</pre></div>
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<a name="index-line-comment-character"></a>
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<p>Anything from a <em>line comment</em> character up to the next newline is
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considered a comment and is ignored. The line comment character is target
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specific, and some targets multiple comment characters. Some targets also have
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line comment characters that only work if they are the first character on a
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line. Some targets use a sequence of two characters to introduce a line
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comment. Some targets can also change their line comment characters depending
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upon command-line options that have been used. For more details see the
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<em>Syntax</em> section in the documentation for individual targets.
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</p>
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<p>If the line comment character is the hash sign (‘<samp>#</samp>’) then it still has the
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special ability to enable and disable preprocessing (see <a href="Preprocessing.html#Preprocessing">Preprocessing</a>) and
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to specify logical line numbers:
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</p>
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<a name="index-_0023"></a>
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<a name="index-lines-starting-with-_0023"></a>
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<a name="index-logical-line-numbers"></a>
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<p>To be compatible with past assemblers, lines that begin with ‘<samp>#</samp>’ have a
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special interpretation. Following the ‘<samp>#</samp>’ should be an absolute
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expression (see <a href="Expressions.html#Expressions">Expressions</a>): the logical line number of the <em>next</em>
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line. Then a string (see <a href="Strings.html#Strings">Strings</a>) is allowed: if present it is a
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new logical file name. The rest of the line, if any, should be whitespace.
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</p>
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<p>If the first non-whitespace characters on the line are not numeric,
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the line is ignored. (Just like a comment.)
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</p>
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<div class="smallexample">
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<pre class="smallexample"> # This is an ordinary comment.
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# 42-6 "new_file_name" # New logical file name
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# This is logical line # 36.
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</pre></div>
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<p>This feature is deprecated, and may disappear from future versions
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of <code>as</code>.
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Symbol-Intro.html#Symbol-Intro" accesskey="n" rel="next">Symbol Intro</a>, Previous: <a href="Whitespace.html#Whitespace" accesskey="p" rel="prev">Whitespace</a>, Up: <a href="Syntax.html#Syntax" accesskey="u" rel="up">Syntax</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>
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</div>
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</body>
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</html>
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