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| <h4 class="subsection">23.3.2 Guile Commands</h4> |
| |
| <p><a name="index-guile-commands-2450"></a><a name="index-commands-to-access-guile-2451"></a> |
| <span class="sc">gdb</span> provides two commands for accessing the Guile interpreter: |
| |
| |
| <a name="index-guile_002drepl-2452"></a> |
| <a name="index-gr-2453"></a> |
| <dl><dt><code>guile-repl</code><dt><code>gr</code><dd>The <code>guile-repl</code> command can be used to start an interactive |
| Guile prompt or <dfn>repl</dfn>. To return to <span class="sc">gdb</span>, |
| type <kbd>,q</kbd> or the <code>EOF</code> character (e.g., <kbd>Ctrl-D</kbd> on |
| an empty prompt). These commands do not take any arguments. |
| |
| <p><a name="index-guile-2454"></a><a name="index-gu-2455"></a><br><dt><code>guile </code><span class="roman">[</span><var>scheme-expression</var><span class="roman">]</span><dt><code>gu </code><span class="roman">[</span><var>scheme-expression</var><span class="roman">]</span><dd>The <code>guile</code> command can be used to evaluate a Scheme expression. |
| |
| <p>If given an argument, <span class="sc">gdb</span> will pass the argument to the Guile |
| interpreter for evaluation. |
| |
| <pre class="smallexample"> (gdb) guile (display (+ 20 3)) (newline) |
| 23 |
| </pre> |
| <p>The result of the Scheme expression is displayed using normal Guile rules. |
| |
| <pre class="smallexample"> (gdb) guile (+ 20 3) |
| 23 |
| </pre> |
| <p>If you do not provide an argument to <code>guile</code>, it will act as a |
| multi-line command, like <code>define</code>. In this case, the Guile |
| script is made up of subsequent command lines, given after the |
| <code>guile</code> command. This command list is terminated using a line |
| containing <code>end</code>. For example: |
| |
| <pre class="smallexample"> (gdb) guile |
| >(display 23) |
| >(newline) |
| >end |
| 23 |
| </pre> |
| </dl> |
| |
| <p>It is also possible to execute a Guile script from the <span class="sc">gdb</span> |
| interpreter: |
| |
| <dl> |
| <dt><code>source </code><samp><span class="file">script-name</span></samp><dd>The script name must end with ‘<samp><span class="samp">.scm</span></samp>’ and <span class="sc">gdb</span> must be configured |
| to recognize the script language based on filename extension using |
| the <code>script-extension</code> setting. See <a href="Extending-GDB.html#Extending-GDB">Extending GDB</a>. |
| |
| <br><dt><code>guile (load "script-name")</code><dd>This method uses the <code>load</code> Guile function. |
| It takes a string argument that is the name of the script to load. |
| See the Guile documentation for a description of this function. |
| (see <a href="../guile/Loading.html#Loading">Loading</a>). |
| </dl> |
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