140 lines
6.1 KiB
HTML
140 lines
6.1 KiB
HTML
<!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) 1991-2021 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 5.1, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Using as: File</title>
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<meta name="description" content="Using as: File">
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<meta name="keywords" content="Using as: File">
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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="Pseudo-Ops.html#Pseudo-Ops" rel="up" title="Pseudo Ops">
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<link href="Fill.html#Fill" rel="next" title="Fill">
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<link href="Fail.html#Fail" rel="previous" title="Fail">
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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.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.indentedblock {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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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" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="File"></a>
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<div class="header">
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<p>
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Next: <a href="Fill.html#Fill" accesskey="n" rel="next">Fill</a>, Previous: <a href="Fail.html#Fail" accesskey="p" rel="previous">Fail</a>, Up: <a href="Pseudo-Ops.html#Pseudo-Ops" accesskey="u" rel="up">Pseudo Ops</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="g_t_002efile"></a>
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<h3 class="section">7.36 <code>.file</code></h3>
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<a name="index-file-directive"></a>
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<p>There are two different versions of the <code>.file</code> directive. Targets
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that support DWARF2 line number information use the DWARF2 version of
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<code>.file</code>. Other targets use the default version.
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</p>
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<a name="Default-Version"></a>
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<h4 class="subheading">Default Version</h4>
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<a name="index-logical-file-name"></a>
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<a name="index-file-name_002c-logical"></a>
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<p>This version of the <code>.file</code> directive tells <code>as</code> that we
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are about to start a new logical file. The syntax is:
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</p>
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<div class="smallexample">
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<pre class="smallexample">.file <var>string</var>
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</pre></div>
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<p><var>string</var> is the new file name. In general, the filename is
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recognized whether or not it is surrounded by quotes ‘<samp>"</samp>’; but if you wish
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to specify an empty file name, you must give the quotes–<code>""</code>. This
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statement may go away in future: it is only recognized to be compatible with
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old <code>as</code> programs.
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</p>
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<a name="DWARF2-Version"></a>
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<h4 class="subheading">DWARF2 Version</h4>
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<p>When emitting DWARF2 line number information, <code>.file</code> assigns filenames
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to the <code>.debug_line</code> file name table. The syntax is:
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</p>
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<div class="smallexample">
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<pre class="smallexample">.file <var>fileno</var> <var>filename</var>
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</pre></div>
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<p>The <var>fileno</var> operand should be a unique positive integer to use as the
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index of the entry in the table. The <var>filename</var> operand is a C string
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literal enclosed in double quotes. The <var>filename</var> can include directory
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elements. If it does, then the directory will be added to the directory table
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and the basename will be added to the file table.
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</p>
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<p>The detail of filename indices is exposed to the user because the filename
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table is shared with the <code>.debug_info</code> section of the DWARF2 debugging
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information, and thus the user must know the exact indices that table
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entries will have.
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</p>
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<p>If DWARF-5 support has been enabled via the <samp>-gdwarf-5</samp> option then
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an extended version of the <code>file</code> is also allowed:
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</p>
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<div class="smallexample">
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<pre class="smallexample">.file <var>fileno</var> [<var>dirname</var>] <var>filename</var> [md5 <var>value</var>]
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</pre></div>
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<p>With this version a separate directory name is allowed, although if this is
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used then <var>filename</var> should not contain any directory components. In
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addtion an md5 hash value of the contents of <var>filename</var> can be provided.
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This will be stored in the the file table as well, and can be used by tools
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reading the debug information to verify that the contents of the source file
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match the contents of the compiled file.
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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="Fill.html#Fill" accesskey="n" rel="next">Fill</a>, Previous: <a href="Fail.html#Fail" accesskey="p" rel="previous">Fail</a>, Up: <a href="Pseudo-Ops.html#Pseudo-Ops" accesskey="u" rel="up">Pseudo Ops</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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