95 lines
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95 lines
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This file documents the GNU Assembler "as".
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Next: <a rel="next" accesskey="n" href="Loc_005fmark_005flabels.html#Loc_005fmark_005flabels">Loc_mark_labels</a>,
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<h3 class="section">7.57 <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-g_t_0040code_007bloc_007d-directive-401"></a>When emitting DWARF2 line number information,
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the <code>.loc</code> directive will add a 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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<br><dt><code>discriminator </code><var>value</var><dd>This directive will set the <code>discriminator</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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<br><dt><code>view </code><var>value</var><dd>This option causes a row to be added to <code>.debug_line</code> in reference to the
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current address (which might not be the same as that of the following assembly
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instruction), and to associate <var>value</var> with the <code>view</code> register in the
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<code>.debug_line</code> state machine. If <var>value</var> is a label, both the
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<code>view</code> register and the label are set to the number of prior <code>.loc</code>
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directives at the same program location. If <var>value</var> is the literal
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<code>0</code>, the <code>view</code> register is set to zero, and the assembler asserts
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that there aren't any prior <code>.loc</code> directives at the same program
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location. If <var>value</var> is the literal <code>-0</code>, the assembler arrange for
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the <code>view</code> register to be reset in this row, even if there are prior
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<code>.loc</code> directives at the same program location.
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</dl>
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