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95 lines
4.3 KiB
HTML
95 lines
4.3 KiB
HTML
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<head>
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<title>Multiple Extension Languages (Debugging with GDB)</title>
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Extending-GDB.html#Extending-GDB" rel="up" title="Extending GDB">
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<a name="Multiple-Extension-Languages"></a>
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<div class="header">
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<p>
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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> [<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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</div>
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<hr>
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<a name="Multiple-Extension-Languages-1"></a>
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<h3 class="section">23.5 Multiple Extension Languages</h3>
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<p>The Guile and Python extension languages do not share any state,
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and generally do not interfere with each other.
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There are some things to be aware of, however.
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</p>
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<a name="Python-comes-first"></a>
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<h4 class="subsection">23.5.1 Python comes first</h4>
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<p>Python was <small>GDB</small>’s first extension language, and to avoid breaking
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existing behaviour Python comes first. This is generally solved by the
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“first one wins” principle. <small>GDB</small> maintains a list of enabled
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extension languages, and when it makes a call to an extension language,
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(say to pretty-print a value), it tries each in turn until an extension
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language indicates it has performed the request (e.g., has returned the
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pretty-printed form of a value).
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This extends to errors while performing such requests: If an error happens
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while, for example, trying to pretty-print an object then the error is
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reported and any following extension languages are not tried.
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</p>
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