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diff --git a/share/doc/gdb/Multiple-Extension-Languages.html b/share/doc/gdb/Multiple-Extension-Languages.html new file mode 100644 index 0000000..f031d3d --- /dev/null +++ b/share/doc/gdb/Multiple-Extension-Languages.html @@ -0,0 +1,95 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1988-2023 Free Software Foundation, Inc. + +Permission is granted to copy, distribute and/or modify this document +under the terms of the GNU Free Documentation License, Version 1.3 or +any later version published by the Free Software Foundation; with the +Invariant Sections being "Free Software" and "Free Software Needs +Free Documentation", with the Front-Cover Texts being "A GNU Manual," +and with the Back-Cover Texts as in (a) below. + +(a) The FSF's Back-Cover Text is: "You are free to copy and modify +this GNU Manual. Buying copies from GNU Press supports the FSF in +developing GNU and promoting software freedom." --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>Debugging with GDB: Multiple Extension Languages</title> + +<meta name="description" content="Debugging with GDB: Multiple Extension Languages"> +<meta name="keywords" content="Debugging with GDB: Multiple Extension Languages"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Extending-GDB.html#Extending-GDB" rel="up" title="Extending GDB"> +<link href="Interpreters.html#Interpreters" rel="next" title="Interpreters"> +<link href="Which-flavor-to-choose_003f.html#Which-flavor-to-choose_003f" rel="previous" title="Which flavor to choose?"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +div.smalllisp {margin-left: 3.2em} +kbd {font-style:oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Multiple-Extension-Languages"></a> +<div class="header"> +<p> +Previous: <a href="Auto_002dloading-extensions.html#Auto_002dloading-extensions" accesskey="p" rel="previous">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> +</div> +<hr> +<a name="Multiple-Extension-Languages-1"></a> +<h3 class="section">23.6 Multiple Extension Languages</h3> + +<p>The Guile and Python extension languages do not share any state, +and generally do not interfere with each other. +There are some things to be aware of, however. +</p> +<a name="Python-comes-first"></a> +<h4 class="subsection">23.6.1 Python comes first</h4> + +<p>Python was <small>GDB</small>’s first extension language, and to avoid breaking +existing behaviour Python comes first. This is generally solved by the +“first one wins” principle. <small>GDB</small> maintains a list of enabled +extension languages, and when it makes a call to an extension language, +(say to pretty-print a value), it tries each in turn until an extension +language indicates it has performed the request (e.g., has returned the +pretty-printed form of a value). +This extends to errors while performing such requests: If an error happens +while, for example, trying to pretty-print an object then the error is +reported and any following extension languages are not tried. +</p> + + + +</body> +</html> |