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<a name="g_t_002eloc-fileno-lineno-_005bcolumn_005d-_005boptions_005d"></a>
<h3 class="section">7.54 <code>.loc <var>fileno</var> <var>lineno</var> [<var>column</var>] [<var>options</var>]</code></h3>
<a name="index-loc-directive"></a>
<p>When emitting DWARF2 line number information,
the <code>.loc</code> directive will add a row to the <code>.debug_line</code> line
number matrix corresponding to the immediately following assembly
instruction. The <var>fileno</var>, <var>lineno</var>, and optional <var>column</var>
arguments will be applied to the <code>.debug_line</code> state machine before
the row is added.
</p>
<p>The <var>options</var> are a sequence of the following tokens in any order:
</p>
<dl compact="compact">
<dt><code>basic_block</code></dt>
<dd><p>This option will set the <code>basic_block</code> register in the
<code>.debug_line</code> state machine to <code>true</code>.
</p>
</dd>
<dt><code>prologue_end</code></dt>
<dd><p>This option will set the <code>prologue_end</code> register in the
<code>.debug_line</code> state machine to <code>true</code>.
</p>
</dd>
<dt><code>epilogue_begin</code></dt>
<dd><p>This option will set the <code>epilogue_begin</code> register in the
<code>.debug_line</code> state machine to <code>true</code>.
</p>
</dd>
<dt><code>is_stmt <var>value</var></code></dt>
<dd><p>This option will set the <code>is_stmt</code> register in the
<code>.debug_line</code> state machine to <code>value</code>, which must be
either 0 or 1.
</p>
</dd>
<dt><code>isa <var>value</var></code></dt>
<dd><p>This directive will set the <code>isa</code> register in the <code>.debug_line</code>
state machine to <var>value</var>, which must be an unsigned integer.
</p>
</dd>
<dt><code>discriminator <var>value</var></code></dt>
<dd><p>This directive will set the <code>discriminator</code> register in the <code>.debug_line</code>
state machine to <var>value</var>, which must be an unsigned integer.
</p>
</dd>
</dl>
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