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<title>LNS directives - Using as</title>
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<h3 class="section">7.29 <code>.file </code><var>fileno</var> <var>filename</var></h3>
<p><a name="index-_0040code_007bfile_007d-directive-292"></a>When emitting dwarf2 line number information <code>.file</code> assigns filenames
to the <code>.debug_line</code> file name table. 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.
<h3 class="section">7.30 <code>.loc </code><var>fileno</var> <var>lineno</var><code> [</code><var>column</var><code>] [</code><var>options</var><code>]</code></h3>
<p><a name="index-_0040code_007bloc_007d-directive-293"></a>The <code>.loc</code> directive will add 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>The <var>options</var> are a sequence of the following tokens in any order:
<dl>
<dt><code>basic_block</code><dd>This option will set the <code>basic_block</code> register in the
<code>.debug_line</code> state machine to <code>true</code>.
<br><dt><code>prologue_end</code><dd>This option will set the <code>prologue_end</code> register in the
<code>.debug_line</code> state machine to <code>true</code>.
<br><dt><code>epilogue_begin</code><dd>This option will set the <code>epilogue_begin</code> register in the
<code>.debug_line</code> state machine to <code>true</code>.
<br><dt><code>is_stmt </code><var>value</var><dd>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.
<br><dt><code>isa </code><var>value</var><dd>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.
</dl>
<h3 class="section">7.31 <code>.loc_mark_labels </code><var>enable</var></h3>
<p><a name="index-_0040code_007bloc_005fmark_005flabels_007d-directive-294"></a>The <code>.loc_mark_labels</code> directive makes the assembler emit an entry
to the <code>.debug_line</code> line number matrix with the <code>basic_block</code>
register in the state machine set whenever a code label is seen.
The <var>enable</var> argument should be either 1 or 0, to enable or disable
this function respectively.
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