aarch64-linux-gnu-5.1/share/doc/as.html/File.html

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- This file documents the GNU Assembler "as".

Copyright (C) 1991-2015 Free Software Foundation, Inc.

Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3
or any later version published by the Free Software Foundation;
with no Invariant Sections, with no Front-Cover Texts, and with no
Back-Cover Texts.  A copy of the license is included in the
section entitled "GNU Free Documentation License".
 -->
<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
<head>
<title>Using as: File</title>

<meta name="description" content="Using as: File">
<meta name="keywords" content="Using as: File">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link href="index.html#Top" rel="start" title="Top">
<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
<link href="Pseudo-Ops.html#Pseudo-Ops" rel="up" title="Pseudo Ops">
<link href="Fill.html#Fill" rel="next" title="Fill">
<link href="Fail.html#Fail" rel="prev" title="Fail">
<style type="text/css">
<!--
a.summary-letter {text-decoration: none}
blockquote.smallquotation {font-size: smaller}
div.display {margin-left: 3.2em}
div.example {margin-left: 3.2em}
div.indentedblock {margin-left: 3.2em}
div.lisp {margin-left: 3.2em}
div.smalldisplay {margin-left: 3.2em}
div.smallexample {margin-left: 3.2em}
div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
div.smalllisp {margin-left: 3.2em}
kbd {font-style:oblique}
pre.display {font-family: inherit}
pre.format {font-family: inherit}
pre.menu-comment {font-family: serif}
pre.menu-preformatted {font-family: serif}
pre.smalldisplay {font-family: inherit; font-size: smaller}
pre.smallexample {font-size: smaller}
pre.smallformat {font-family: inherit; font-size: smaller}
pre.smalllisp {font-size: smaller}
span.nocodebreak {white-space:nowrap}
span.nolinebreak {white-space:nowrap}
span.roman {font-family:serif; font-weight:normal}
span.sansserif {font-family:sans-serif; font-weight:normal}
ul.no-bullet {list-style: none}
-->
</style>


</head>

<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
<a name="File"></a>
<div class="header">
<p>
Next: <a href="Fill.html#Fill" accesskey="n" rel="next">Fill</a>, Previous: <a href="Fail.html#Fail" accesskey="p" rel="prev">Fail</a>, Up: <a href="Pseudo-Ops.html#Pseudo-Ops" accesskey="u" rel="up">Pseudo Ops</a> &nbsp; [<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>
</div>
<hr>
<a name="g_t_002efile"></a>
<h3 class="section">7.32 <code>.file</code></h3>
<a name="index-file-directive"></a>

<p>There are two different versions of the <code>.file</code> directive.  Targets
that support DWARF2 line number information use the DWARF2 version of
<code>.file</code>.  Other targets use the default version.
</p>
<a name="Default-Version"></a>
<h4 class="subheading">Default Version</h4>

<a name="index-logical-file-name"></a>
<a name="index-file-name_002c-logical"></a>
<p>This version of the <code>.file</code> directive tells <code>as</code> that we
are about to start a new logical file.  The syntax is:
</p>
<div class="smallexample">
<pre class="smallexample">.file <var>string</var>
</pre></div>

<p><var>string</var> is the new file name.  In general, the filename is
recognized whether or not it is surrounded by quotes &lsquo;<samp>&quot;</samp>&rsquo;; but if you wish
to specify an empty file name, you must give the quotes&ndash;<code>&quot;&quot;</code>.  This
statement may go away in future: it is only recognized to be compatible with
old <code>as</code> programs.
</p>
<a name="DWARF2-Version"></a>
<h4 class="subheading">DWARF2 Version</h4>

<p>When emitting DWARF2 line number information, <code>.file</code> assigns filenames
to the <code>.debug_line</code> file name table.  The syntax is:
</p>
<div class="smallexample">
<pre class="smallexample">.file <var>fileno</var> <var>filename</var>
</pre></div>

<p>The <var>fileno</var> operand should be a unique positive integer to use as the
index of the entry in the table.  The <var>filename</var> operand is a C string
literal.
</p>
<p>The detail of filename indices is exposed to the user because the filename
table is shared with the <code>.debug_info</code> section of the DWARF2 debugging
information, and thus the user must know the exact indices that table
entries will have.
</p>



</body>
</html>