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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>Multiple Extension Languages (Debugging with GDB)</title>

  19. 

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  27. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  28. <link href="Extending-GDB.html#Extending-GDB" rel="up" title="Extending GDB">

  29. <link href="Aliases.html#Aliases" rel="next" title="Aliases">

  30. <link href="Which-flavor-to-choose_003f.html#Which-flavor-to-choose_003f" rel="prev" title="Which flavor to choose?">

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  62. <body lang="en">

  63. <a name="Multiple-Extension-Languages"></a>

  64. <div class="header">

  65. <p>

  66. Next: <a href="Aliases.html#Aliases" accesskey="n" rel="next">Aliases</a>, Previous: <a href="Auto_002dloading-extensions.html#Auto_002dloading-extensions" accesskey="p" rel="prev">Auto-loading extensions</a>, Up: <a href="Extending-GDB.html#Extending-GDB" accesskey="u" rel="up">Extending GDB</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="Multiple-Extension-Languages-1"></a>

  70. <h3 class="section">23.5 Multiple Extension Languages</h3>

  71. 

  72. <p>The Guile and Python extension languages do not share any state,

  73. and generally do not interfere with each other.

  74. There are some things to be aware of, however.

  75. </p>

  76. <a name="Python-comes-first"></a>

  77. <h4 class="subsection">23.5.1 Python comes first</h4>

  78. 

  79. <p>Python was <small>GDB</small>&rsquo;s first extension language, and to avoid breaking

  80. existing behaviour Python comes first.  This is generally solved by the

  81. &ldquo;first one wins&rdquo; principle.  <small>GDB</small> maintains a list of enabled

  82. extension languages, and when it makes a call to an extension language,

  83. (say to pretty-print a value), it tries each in turn until an extension

  84. language indicates it has performed the request (e.g., has returned the

  85. pretty-printed form of a value).

  86. This extends to errors while performing such requests: If an error happens

  87. while, for example, trying to pretty-print an object then the error is

  88. reported and any following extension languages are not tried.

  89. </p>

  90. 

  91. 

  92. 

  93. </body>

  94. </html>