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<title>Debugging with GDB: Guile Commands</title>
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<a name="Guile-Commands"></a>
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<p>
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Next: <a href="Guile-API.html#Guile-API" accesskey="n" rel="next">Guile API</a>, Previous: <a href="Guile-Introduction.html#Guile-Introduction" accesskey="p" rel="previous">Guile Introduction</a>, Up: <a href="Guile.html#Guile" accesskey="u" rel="up">Guile</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="Guile-Commands-1"></a>
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<h4 class="subsection">23.3.2 Guile Commands</h4>
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<a name="index-guile-commands"></a>
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<a name="index-commands-to-access-guile"></a>
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<p><small>GDB</small> provides two commands for accessing the Guile interpreter:
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</p>
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<dl compact="compact">
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<dd><a name="index-guile_002drepl"></a>
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<a name="index-gr"></a>
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</dd>
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<dt><code>guile-repl</code></dt>
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<dt><code>gr</code></dt>
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<dd><p>The <code>guile-repl</code> command can be used to start an interactive
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Guile prompt or <em>repl</em>. To return to <small>GDB</small>,
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type <kbd>,q</kbd> or the <code>EOF</code> character (e.g., <kbd>Ctrl-D</kbd> on
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an empty prompt). These commands do not take any arguments.
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</p>
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<a name="index-guile"></a>
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<a name="index-gu"></a>
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</dd>
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<dt><code>guile <span class="roman">[</span><var>scheme-expression</var><span class="roman">]</span></code></dt>
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<dt><code>gu <span class="roman">[</span><var>scheme-expression</var><span class="roman">]</span></code></dt>
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<dd><p>The <code>guile</code> command can be used to evaluate a Scheme expression.
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</p>
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<p>If given an argument, <small>GDB</small> will pass the argument to the Guile
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interpreter for evaluation.
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) guile (display (+ 20 3)) (newline)
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23
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</pre></div>
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<p>The result of the Scheme expression is displayed using normal Guile rules.
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) guile (+ 20 3)
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23
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</pre></div>
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<p>If you do not provide an argument to <code>guile</code>, it will act as a
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multi-line command, like <code>define</code>. In this case, the Guile
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script is made up of subsequent command lines, given after the
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<code>guile</code> command. This command list is terminated using a line
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containing <code>end</code>. For example:
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</p>
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<div class="smallexample">
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<pre class="smallexample">(gdb) guile
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>(display 23)
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>(newline)
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>end
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23
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</pre></div>
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</dd>
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</dl>
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<p>It is also possible to execute a Guile script from the <small>GDB</small>
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interpreter:
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</p>
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<dl compact="compact">
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<dt><code>source <samp>script-name</samp></code></dt>
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<dd><p>The script name must end with ‘<samp>.scm</samp>’ and <small>GDB</small> must be configured
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to recognize the script language based on filename extension using
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the <code>script-extension</code> setting. See <a href="Extending-GDB.html#Extending-GDB">Extending GDB</a>.
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</p>
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</dd>
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<dt><code>guile (load "script-name")</code></dt>
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<dd><p>This method uses the <code>load</code> Guile function.
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It takes a string argument that is the name of the script to load.
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See the Guile documentation for a description of this function.
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(see <a href="http://www.gnu.org/software/guile/manual/html_node/Loading.html#Loading">Loading</a> in <cite>GNU Guile Reference Manual</cite>).
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</p></dd>
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Next: <a href="Guile-API.html#Guile-API" accesskey="n" rel="next">Guile API</a>, Previous: <a href="Guile-Introduction.html#Guile-Introduction" accesskey="p" rel="previous">Guile Introduction</a>, Up: <a href="Guile.html#Guile" accesskey="u" rel="up">Guile</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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