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100 lines
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<title>Method Names in Commands - Debugging with GDB</title>
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<link rel="up" href="Objective_002dC.html#Objective_002dC" title="Objective-C">
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<link rel="next" href="The-Print-Command-with-Objective_002dC.html#The-Print-Command-with-Objective_002dC" title="The Print Command with Objective-C">
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<div class="node">
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<a name="Method-Names-in-Commands"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="The-Print-Command-with-Objective_002dC.html#The-Print-Command-with-Objective_002dC">The Print Command with Objective-C</a>,
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Up: <a rel="up" accesskey="u" href="Objective_002dC.html#Objective_002dC">Objective-C</a>
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<hr>
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</div>
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<h5 class="subsubsection">15.4.4.1 Method Names in Commands</h5>
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<p>The following commands have been extended to accept Objective-C method
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names as line specifications:
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<p><a name="index-clear_0040r_007b_002c-and-Objective_002dC_007d-1020"></a><a name="index-break_0040r_007b_002c-and-Objective_002dC_007d-1021"></a><a name="index-info-line_0040r_007b_002c-and-Objective_002dC_007d-1022"></a><a name="index-jump_0040r_007b_002c-and-Objective_002dC_007d-1023"></a><a name="index-list_0040r_007b_002c-and-Objective_002dC_007d-1024"></a>
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<ul>
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<li><code>clear</code>
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<li><code>break</code>
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<li><code>info line</code>
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<li><code>jump</code>
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<li><code>list</code>
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</ul>
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<p>A fully qualified Objective-C method name is specified as
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<pre class="smallexample"> -[<var>Class</var> <var>methodName</var>]
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</pre>
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<p>where the minus sign is used to indicate an instance method and a
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plus sign (not shown) is used to indicate a class method. The class
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name <var>Class</var> and method name <var>methodName</var> are enclosed in
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brackets, similar to the way messages are specified in Objective-C
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source code. For example, to set a breakpoint at the <code>create</code>
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instance method of class <code>Fruit</code> in the program currently being
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debugged, enter:
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<pre class="smallexample"> break -[Fruit create]
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</pre>
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<p>To list ten program lines around the <code>initialize</code> class method,
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enter:
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<pre class="smallexample"> list +[NSText initialize]
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</pre>
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<p>In the current version of <span class="sc">gdb</span>, the plus or minus sign is
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required. In future versions of <span class="sc">gdb</span>, the plus or minus
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sign will be optional, but you can use it to narrow the search. It
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is also possible to specify just a method name:
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<pre class="smallexample"> break create
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</pre>
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<p>You must specify the complete method name, including any colons. If
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your program's source files contain more than one <code>create</code> method,
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you'll be presented with a numbered list of classes that implement that
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method. Indicate your choice by number, or type ‘<samp><span class="samp">0</span></samp>’ to exit if
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none apply.
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<p>As another example, to clear a breakpoint established at the
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<code>makeKeyAndOrderFront:</code> method of the <code>NSWindow</code> class, enter:
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<pre class="smallexample"> clear -[NSWindow makeKeyAndOrderFront:]
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</pre>
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</body></html>
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