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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

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  18. <title>Finish Breakpoints in Python (Debugging with GDB)</title>

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  63. <a name="Finish-Breakpoints-in-Python"></a>

  64. <div class="header">

  65. <p>

  66. Next: <a href="Lazy-Strings-In-Python.html#Lazy-Strings-In-Python" accesskey="n" rel="next">Lazy Strings In Python</a>, Previous: <a href="Breakpoints-In-Python.html#Breakpoints-In-Python" accesskey="p" rel="prev">Breakpoints In Python</a>, Up: <a href="Python-API.html#Python-API" accesskey="u" rel="up">Python API</a> &nbsp; [<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>

  67. </div>

  68. <hr>

  69. <a name="Finish-Breakpoints"></a>

  70. <h4 class="subsubsection">23.2.2.31 Finish Breakpoints</h4>

  71. 

  72. <a name="index-python-finish-breakpoints"></a>

  73. <a name="index-gdb_002eFinishBreakpoint"></a>

  74. 

  75. <p>A finish breakpoint is a temporary breakpoint set at the return address of

  76. a frame, based on the <code>finish</code> command.  <code>gdb.FinishBreakpoint</code>

  77. extends <code>gdb.Breakpoint</code>.  The underlying breakpoint will be disabled 

  78. and deleted when the execution will run out of the breakpoint scope (i.e. 

  79. <code>Breakpoint.stop</code> or <code>FinishBreakpoint.out_of_scope</code> triggered).

  80. Finish breakpoints are thread specific and must be create with the right 

  81. thread selected.  

  82. </p> 

  83. <dl>

  84. <dt><a name="index-FinishBreakpoint_002e_005f_005finit_005f_005f"></a>Function: <strong>FinishBreakpoint.__init__</strong> <em>(<span class="roman">[</span>frame<span class="roman">]</span> <span class="roman">[</span>, internal<span class="roman">]</span>)</em></dt>

  85. <dd><p>Create a finish breakpoint at the return address of the <code>gdb.Frame</code>

  86. object <var>frame</var>.  If <var>frame</var> is not provided, this defaults to the

  87. newest frame.  The optional <var>internal</var> argument allows the breakpoint to

  88. become invisible to the user.  See <a href="Breakpoints-In-Python.html#Breakpoints-In-Python">Breakpoints In Python</a>, for further 

  89. details about this argument.

  90. </p></dd></dl>

  91. 

  92. <dl>

  93. <dt><a name="index-FinishBreakpoint_002eout_005fof_005fscope"></a>Function: <strong>FinishBreakpoint.out_of_scope</strong> <em>(self)</em></dt>

  94. <dd><p>In some circumstances (e.g. <code>longjmp</code>, C<tt>++</tt> exceptions, <small>GDB</small> 

  95. <code>return</code> command, &hellip;), a function may not properly terminate, and

  96. thus never hit the finish breakpoint.  When <small>GDB</small> notices such a

  97. situation, the <code>out_of_scope</code> callback will be triggered.

  98. </p>

  99. <p>You may want to sub-class <code>gdb.FinishBreakpoint</code> and override this

  100. method:

  101. </p>

  102. <div class="smallexample">

  103. <pre class="smallexample">class MyFinishBreakpoint (gdb.FinishBreakpoint)

  104.     def stop (self):

  105.         print &quot;normal finish&quot;

  106.         return True

  107.     

  108.     def out_of_scope ():

  109.         print &quot;abnormal finish&quot;

  110. </pre></div>

  111. </dd></dl>

  112. 

  113. <dl>

  114. <dt><a name="index-FinishBreakpoint_002ereturn_005fvalue"></a>Variable: <strong>FinishBreakpoint.return_value</strong></dt>

  115. <dd><p>When <small>GDB</small> is stopped at a finish breakpoint and the frame 

  116. used to build the <code>gdb.FinishBreakpoint</code> object had debug symbols, this

  117. attribute will contain a <code>gdb.Value</code> object corresponding to the return

  118. value of the function.  The value will be <code>None</code> if the function return 

  119. type is <code>void</code> or if the return value was not computable.  This attribute

  120. is not writable.

  121. </p></dd></dl>

  122. 

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  126. Next: <a href="Lazy-Strings-In-Python.html#Lazy-Strings-In-Python" accesskey="n" rel="next">Lazy Strings In Python</a>, Previous: <a href="Breakpoints-In-Python.html#Breakpoints-In-Python" accesskey="p" rel="prev">Breakpoints In Python</a>, Up: <a href="Python-API.html#Python-API" accesskey="u" rel="up">Python API</a> &nbsp; [<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>

  127. </div>

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