114 lines
5.1 KiB
HTML
114 lines
5.1 KiB
HTML
<html lang="en">
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<head>
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<title>Comments - Using as</title>
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<link rel="up" href="Syntax.html#Syntax" title="Syntax">
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<link rel="prev" href="Whitespace.html#Whitespace" title="Whitespace">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 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 1.1
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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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</head>
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<body>
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<div class="node">
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<p>
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<a name="Comments"></a>Next: <a rel="next" accesskey="n" href="Symbol-Intro.html#Symbol-Intro">Symbol Intro</a>,
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Previous: <a rel="previous" accesskey="p" href="Whitespace.html#Whitespace">Whitespace</a>,
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Up: <a rel="up" accesskey="u" href="Syntax.html#Syntax">Syntax</a>
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<hr><br>
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</div>
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<h3 class="section">3.3 Comments</h3>
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<p><a name="index-comments-123"></a>There are two ways of rendering comments to <span class="command">as</span>. In both
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cases the comment is equivalent to one space.
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<p>Anything from <span class="samp">/*</span> through the next <span class="samp">*/</span> is a comment.
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This means you may not nest these comments.
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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>
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<p><a name="index-line-comment-character-124"></a>Anything from the <dfn>line comment</dfn> character to the next newline
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is considered a comment and is ignored. The line comment character is
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<span class="samp">;</span> on the ARC;
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<span class="samp">@</span> on the ARM;
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<span class="samp">;</span> for the H8/300 family;
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<span class="samp">;</span> for the HPPA;
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<span class="samp">#</span> on the i386 and x86-64;
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<span class="samp">#</span> on the i960;
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<span class="samp">;</span> for the PDP-11;
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<span class="samp">;</span> for picoJava;
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<span class="samp">#</span> for Motorola PowerPC;
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<span class="samp">!</span> for the Renesas / SuperH SH;
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<span class="samp">!</span> on the SPARC;
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<span class="samp">#</span> on the ip2k;
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<span class="samp">#</span> on the m32c;
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<span class="samp">#</span> on the m32r;
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<span class="samp">|</span> on the 680x0;
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<span class="samp">#</span> on the 68HC11 and 68HC12;
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<span class="samp">#</span> on the Vax;
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<span class="samp">;</span> for the Z80;
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<span class="samp">!</span> for the Z8000;
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<span class="samp">#</span> on the V850;
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<span class="samp">#</span> for Xtensa systems;
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see <a href="Machine-Dependencies.html#Machine-Dependencies">Machine Dependencies</a>.
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<!-- FIXME What about i860? -->
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<p>On some machines there are two different line comment characters. One
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character only begins a comment if it is the first non-whitespace character on
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a line, while the other always begins a comment.
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<p>The V850 assembler also supports a double dash as starting a comment that
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extends to the end of the line.
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<p><span class="samp">--</span>;
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<p><a name="index-_0023-125"></a><a name="index-lines-starting-with-_0040code_007b_0023_007d-126"></a><a name="index-logical-line-numbers-127"></a>To be compatible with past assemblers, lines that begin with <span class="samp">#</span> have a
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special interpretation. Following the <span class="samp">#</span> 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>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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<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>
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<p>This feature is deprecated, and may disappear from future versions
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of <span class="command">as</span>.
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</body></html>
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