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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> |
| |
| <p><a name="index-g_t_0040code_007bloc_007d-directive-401"></a>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>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. |
| |
| <br><dt><code>discriminator </code><var>value</var><dd>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. |
| |
| <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 |
| current address (which might not be the same as that of the following assembly |
| instruction), and to associate <var>value</var> with the <code>view</code> register in the |
| <code>.debug_line</code> state machine. If <var>value</var> is a label, both the |
| <code>view</code> register and the label are set to the number of prior <code>.loc</code> |
| directives at the same program location. If <var>value</var> is the literal |
| <code>0</code>, the <code>view</code> register is set to zero, and the assembler asserts |
| that there aren't any prior <code>.loc</code> directives at the same program |
| location. If <var>value</var> is the literal <code>-0</code>, the assembler arrange for |
| the <code>view</code> register to be reset in this row, even if there are prior |
| <code>.loc</code> directives at the same program location. |
| |
| </dl> |
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