When executing the
python command, Python exceptions
uncaught within the Python code are translated to calls to
gdb error-reporting mechanism. If the command that called
python does not handle the error, gdb will
terminate it and print an error message containing the Python
exception name, the associated value, and the Python call stack
backtrace at the point where the exception was raised. Example:
(gdb) python print foo Traceback (most recent call last): File "<string>", line 1, in <module> NameError: name 'foo' is not defined
gdb errors that happen in gdb commands invoked by Python code are converted to Python exceptions. The type of the Python exception depends on the error.
RuntimeError, for compatibility with earlier versions of gdb.
If an error occurring in gdb does not fit into some more
specific category, then the generated exception will have this type.
gdb.errorwhich is thrown when an operation tried to access invalid memory in the inferior.
In all cases, your exception handler will see the gdb error message as its value and the Python call stack backtrace at the Python statement closest to where the gdb error occured as the traceback.
When implementing gdb commands in Python via
it is useful to be able to throw an exception that doesn't cause a
traceback to be printed. For example, the user may have invoked the
command incorrectly. Use the
to handle this case. Example:
(gdb) python >class HelloWorld (gdb.Command): > """Greet the whole world.""" > def __init__ (self): > super (HelloWorld, self).__init__ ("hello-world", gdb.COMMAND_USER) > def invoke (self, args, from_tty): > argv = gdb.string_to_argv (args) > if len (argv) != 0: > raise gdb.GdbError ("hello-world takes no arguments") > print "Hello, World!" >HelloWorld () >end (gdb) hello-world 42 hello-world takes no arguments