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86 lines
3.6 KiB
HTML
86 lines
3.6 KiB
HTML
<html lang="en">
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<head>
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<title>File - Using as</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Using as">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Pseudo-Ops.html#Pseudo-Ops" title="Pseudo Ops">
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<link rel="prev" href="Fail.html#Fail" title="Fail">
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<link rel="next" href="Fill.html#Fill" title="Fill">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2015 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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<meta http-equiv="Content-Style-Type" content="text/css">
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<style type="text/css"><!--
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pre.display { font-family:inherit }
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pre.format { font-family:inherit }
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pre.smalldisplay { font-family:inherit; font-size:smaller }
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pre.smallformat { font-family:inherit; font-size:smaller }
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span.roman { font-family:serif; font-weight:normal; }
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span.sansserif { font-family:sans-serif; font-weight:normal; }
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="File"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Fill.html#Fill">Fill</a>,
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Previous: <a rel="previous" accesskey="p" href="Fail.html#Fail">Fail</a>,
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Up: <a rel="up" accesskey="u" href="Pseudo-Ops.html#Pseudo-Ops">Pseudo Ops</a>
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<hr>
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</div>
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<h3 class="section">7.32 <code>.file</code></h3>
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<p><a name="index-g_t_0040code_007bfile_007d-directive-338"></a>
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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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<h4 class="subheading">Default Version</h4>
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<p><a name="index-logical-file-name-339"></a><a name="index-file-name_002c-logical-340"></a>This version of the <code>.file</code> directive tells <samp><span class="command">as</span></samp> that we
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are about to start a new logical file. The syntax is:
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<pre class="smallexample"> .file <var>string</var>
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</pre>
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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><span class="samp">"</span></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 <samp><span class="command">as</span></samp> programs.
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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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<pre class="smallexample"> .file <var>fileno</var> <var>filename</var>
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</pre>
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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.
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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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</body></html>
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