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115 lines
5.3 KiB
HTML
115 lines
5.3 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Pretty-Printer Introduction (Debugging with GDB)</title>
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<meta name="description" content="Pretty-Printer Introduction (Debugging with GDB)">
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<meta name="keywords" content="Pretty-Printer Introduction (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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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="Pretty-Printing.html#Pretty-Printing" rel="up" title="Pretty Printing">
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<link href="Pretty_002dPrinter-Example.html#Pretty_002dPrinter-Example" rel="next" title="Pretty-Printer Example">
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<link href="Pretty-Printing.html#Pretty-Printing" rel="prev" title="Pretty Printing">
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<style type="text/css">
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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div.example {margin-left: 3.2em}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Pretty_002dPrinter-Introduction"></a>
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<div class="header">
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<p>
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Next: <a href="Pretty_002dPrinter-Example.html#Pretty_002dPrinter-Example" accesskey="n" rel="next">Pretty-Printer Example</a>, Up: <a href="Pretty-Printing.html#Pretty-Printing" accesskey="u" rel="up">Pretty Printing</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="Pretty_002dPrinter-Introduction-1"></a>
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<h4 class="subsection">10.9.1 Pretty-Printer Introduction</h4>
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<p>When <small>GDB</small> prints a value, it first sees if there is a pretty-printer
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registered for the value. If there is then <small>GDB</small> invokes the
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pretty-printer to print the value. Otherwise the value is printed normally.
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</p>
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<p>Pretty-printers are normally named. This makes them easy to manage.
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The ‘<samp>info pretty-printer</samp>’ command will list all the installed
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pretty-printers with their names.
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If a pretty-printer can handle multiple data types, then its
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<em>subprinters</em> are the printers for the individual data types.
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Each such subprinter has its own name.
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The format of the name is <var>printer-name</var>;<var>subprinter-name</var>.
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</p>
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<p>Pretty-printers are installed by <em>registering</em> them with <small>GDB</small>.
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Typically they are automatically loaded and registered when the corresponding
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debug information is loaded, thus making them available without having to
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do anything special.
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</p>
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<p>There are three places where a pretty-printer can be registered.
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</p>
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<ul>
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<li> Pretty-printers registered globally are available when debugging
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all inferiors.
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</li><li> Pretty-printers registered with a program space are available only
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when debugging that program.
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See <a href="Progspaces-In-Python.html#Progspaces-In-Python">Progspaces In Python</a>, for more details on program spaces in Python.
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</li><li> Pretty-printers registered with an objfile are loaded and unloaded
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with the corresponding objfile (e.g., shared library).
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See <a href="Objfiles-In-Python.html#Objfiles-In-Python">Objfiles In Python</a>, for more details on objfiles in Python.
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</li></ul>
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<p>See <a href="Selecting-Pretty_002dPrinters.html#Selecting-Pretty_002dPrinters">Selecting Pretty-Printers</a>, for further information on how
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pretty-printers are selected,
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</p>
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<p>See <a href="Writing-a-Pretty_002dPrinter.html#Writing-a-Pretty_002dPrinter">Writing a Pretty-Printer</a>, for implementing pretty printers
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for new types.
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</p>
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</body>
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</html>
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