* Types In Python:: Python representation of types.
* Pretty Printing API:: Pretty-printing values.
* Selecting Pretty-Printers:: How GDB chooses a pretty-printer.
+* Disabling Pretty-Printers:: Disabling broken printers.
* Commands In Python:: Implementing new commands in Python.
* Parameters In Python:: Adding new @value{GDBN} parameters.
* Functions In Python:: Writing new convenience functions.
@subsubsection Selecting Pretty-Printers
The Python list @code{gdb.pretty_printers} contains an array of
-functions that have been registered via addition as a pretty-printer.
+functions or callable objects that have been registered via addition
+as a pretty-printer.
Each @code{gdb.Progspace} contains a @code{pretty_printers} attribute.
Each @code{gdb.Objfile} also contains a @code{pretty_printers}
attribute.
@value{GDBN} first checks the @code{pretty_printers} attribute of each
@code{gdb.Objfile} in the current program space and iteratively calls
-each function in the list for that @code{gdb.Objfile} until it receives
+each enabled function (@pxref{Disabling Pretty-Printers})
+in the list for that @code{gdb.Objfile} until it receives
a pretty-printer object.
If no pretty-printer is found in the objfile lists, @value{GDBN} then
searches the pretty-printer list of the current program space,
-calling each function until an object is returned.
+calling each enabled function until an object is returned.
After these lists have been exhausted, it tries the global
-@code{gdb.pretty-printers} list, again calling each function until an
+@code{gdb.pretty_printers} list, again calling each enabled function until an
object is returned.
The order in which the objfiles are searched is not specified. For a
gdb.libstdcxx.v6.register_printers (gdb.current_objfile ())
@end smallexample
+@node Disabling Pretty-Printers
+@subsubsection Disabling Pretty-Printers
+@cindex disabling pretty-printers
+
+For various reasons a pretty-printer may not work.
+For example, the underlying data structure may have changed and
+the pretty-printer is out of date.
+
+The consequences of a broken pretty-printer are severe enough that
+@value{GDBN} provides support for enabling and disabling individual
+printers. For example, if @code{print frame-arguments} is on,
+a backtrace can become highly illegible if any argument is printed
+with a broken printer.
+
+Pretty-printers are enabled and disabled by attaching an @code{enabled}
+attribute to the registered function or callable object. If this attribute
+is present and its value is @code{False}, the printer is disabled, otherwise
+the printer is enabled.
+
@node Commands In Python
@subsubsection Commands In Python