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Diffstat (limited to 'gdb/doc/python.texi')
| -rw-r--r-- | gdb/doc/python.texi | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/gdb/doc/python.texi b/gdb/doc/python.texi index e98178a..1035be3 100644 --- a/gdb/doc/python.texi +++ b/gdb/doc/python.texi @@ -3828,6 +3828,30 @@ example, @kbd{set foo off}). The @code{value} attribute has already been populated with the new value and may be used in output. This method must return a string. If the returned string is not empty, @value{GDBN} will present it to the user. + +If this method raises the @code{gdb.GdbError} exception +(@pxref{Exception Handling}), then @value{GDBN} will print the +exception's string and the @code{set} command will fail. Note, +however, that the @code{value} attribute will not be reset in this +case. So, if your parameter must validate values, it should store the +old value internally and reset the exposed value, like so: + +@smallexample +class ExampleParam (gdb.Parameter): + def __init__ (self, name): + super (ExampleParam, self).__init__ (name, + gdb.COMMAND_DATA, + gdb.PARAM_BOOLEAN) + self.value = True + self.saved_value = True + def validate(self): + return False + def get_set_string (self): + if not self.validate(): + self.value = self.saved_value + raise gdb.GdbError('Failed to validate') + self.saved_value = self.value +@end smallexample @end defun @defun Parameter.get_show_string (self, svalue) |