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<title>Debugging with GDB: Pretty-Printer Introduction</title>
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<a name="Pretty_002dPrinter-Introduction"></a>
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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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<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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