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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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<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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