97 lines
4.6 KiB
HTML
97 lines
4.6 KiB
HTML
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<title>LNS directives - Using as</title>
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<link rel="up" href="Pseudo-Ops.html#Pseudo-Ops" title="Pseudo Ops">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 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 1.1
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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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<div class="node">
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<p>
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<a name="LNS-directives"></a>Next: <a rel="next" accesskey="n" href="Long.html#Long">Long</a>,
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Previous: <a rel="previous" accesskey="p" href="Ln.html#Ln">Ln</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><br>
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</div>
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<h3 class="section">7.29 <code>.file </code><var>fileno</var> <var>filename</var></h3>
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<p><a name="index-_0040code_007bfile_007d-directive-292"></a>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 <var>fileno</var> operand should
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be a unique positive integer to use as the index of the entry in the table.
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The <var>filename</var> operand is a C string 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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<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>
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<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
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number matrix corresponding to the immediately following assembly
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instruction. The <var>fileno</var>, <var>lineno</var>, and optional <var>column</var>
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arguments will be applied to the <code>.debug_line</code> state machine before
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the row is added.
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<p>The <var>options</var> are a sequence of the following tokens in any order:
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<dl>
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<dt><code>basic_block</code><dd>This option will set the <code>basic_block</code> register in the
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<code>.debug_line</code> state machine to <code>true</code>.
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<br><dt><code>prologue_end</code><dd>This option will set the <code>prologue_end</code> register in the
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<code>.debug_line</code> state machine to <code>true</code>.
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<br><dt><code>epilogue_begin</code><dd>This option will set the <code>epilogue_begin</code> register in the
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<code>.debug_line</code> state machine to <code>true</code>.
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<br><dt><code>is_stmt </code><var>value</var><dd>This option will set the <code>is_stmt</code> register in the
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<code>.debug_line</code> state machine to <code>value</code>, which must be
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either 0 or 1.
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<br><dt><code>isa </code><var>value</var><dd>This directive will set the <code>isa</code> register in the <code>.debug_line</code>
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state machine to <var>value</var>, which must be an unsigned integer.
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</dl>
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<h3 class="section">7.31 <code>.loc_mark_labels </code><var>enable</var></h3>
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<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
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to the <code>.debug_line</code> line number matrix with the <code>basic_block</code>
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register in the state machine set whenever a code label is seen.
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The <var>enable</var> argument should be either 1 or 0, to enable or disable
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this function respectively.
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</body></html>
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