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| <h3 class="section">7.51 <code>.file</code></h3> |
| |
| <p><a name="index-g_t_0040code_007bfile_007d-directive-328"></a> |
| 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. |
| |
| <h4 class="subheading">Default Version</h4> |
| |
| <p><a name="index-logical-file-name-329"></a><a name="index-file-name_002c-logical-330"></a>This version of the <code>.file</code> directive tells <samp><span class="command">as</span></samp> that we |
| are about to start a new logical file. The syntax is: |
| |
| <pre class="smallexample"> .file <var>string</var> |
| </pre> |
| <p><var>string</var> is the new file name. In general, the filename is |
| recognized whether or not it is surrounded by quotes ‘<samp><span class="samp">"</span></samp>’; but if you wish |
| to specify an empty file name, you must give the quotes–<code>""</code>. This |
| statement may go away in future: it is only recognized to be compatible with |
| old <samp><span class="command">as</span></samp> programs. |
| |
| <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: |
| |
| <pre class="smallexample"> .file <var>fileno</var> <var>filename</var> |
| </pre> |
| <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>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. |
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