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<title>Method Names in Commands (Debugging with GDB)</title>
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<a name="Method-Names-in-Commands"></a>
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<p>
Next: <a href="The-Print-Command-with-Objective_002dC.html#The-Print-Command-with-Objective_002dC" accesskey="n" rel="next">The Print Command with Objective-C</a>, Up: <a href="Objective_002dC.html#Objective_002dC" accesskey="u" rel="up">Objective-C</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>
<a name="Method-Names-in-Commands-1"></a>
<h4 class="subsubsection">15.4.4.1 Method Names in Commands</h4>
<p>The following commands have been extended to accept Objective-C method
names as line specifications:
</p>
<a name="index-clear_002c-and-Objective_002dC"></a>
<a name="index-break_002c-and-Objective_002dC"></a>
<a name="index-info-line_002c-and-Objective_002dC"></a>
<a name="index-jump_002c-and-Objective_002dC"></a>
<a name="index-list_002c-and-Objective_002dC"></a>
<ul>
<li> <code>clear</code>
</li><li> <code>break</code>
</li><li> <code>info line</code>
</li><li> <code>jump</code>
</li><li> <code>list</code>
</li></ul>
<p>A fully qualified Objective-C method name is specified as
</p>
<div class="smallexample">
<pre class="smallexample">-[<var>Class</var> <var>methodName</var>]
</pre></div>
<p>where the minus sign is used to indicate an instance method and a
plus sign (not shown) is used to indicate a class method. The class
name <var>Class</var> and method name <var>methodName</var> are enclosed in
brackets, similar to the way messages are specified in Objective-C
source code. For example, to set a breakpoint at the <code>create</code>
instance method of class <code>Fruit</code> in the program currently being
debugged, enter:
</p>
<div class="smallexample">
<pre class="smallexample">break -[Fruit create]
</pre></div>
<p>To list ten program lines around the <code>initialize</code> class method,
enter:
</p>
<div class="smallexample">
<pre class="smallexample">list +[NSText initialize]
</pre></div>
<p>In the current version of <small>GDB</small>, the plus or minus sign is
required. In future versions of <small>GDB</small>, the plus or minus
sign will be optional, but you can use it to narrow the search. It
is also possible to specify just a method name:
</p>
<div class="smallexample">
<pre class="smallexample">break create
</pre></div>
<p>You must specify the complete method name, including any colons. If
your program’s source files contain more than one <code>create</code> method,
you’ll be presented with a numbered list of classes that implement that
method. Indicate your choice by number, or type ‘<samp>0</samp>’ to exit if
none apply.
</p>
<p>As another example, to clear a breakpoint established at the
<code>makeKeyAndOrderFront:</code> method of the <code>NSWindow</code> class, enter:
</p>
<div class="smallexample">
<pre class="smallexample">clear -[NSWindow makeKeyAndOrderFront:]
</pre></div>
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Next: <a href="The-Print-Command-with-Objective_002dC.html#The-Print-Command-with-Objective_002dC" accesskey="n" rel="next">The Print Command with Objective-C</a>, Up: <a href="Objective_002dC.html#Objective_002dC" accesskey="u" rel="up">Objective-C</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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