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import gdb
import weenix.stack
_weenix_command_prefix = "kernel"
_weenix_command_names = list()
class WeenixPrefixCommand(gdb.Command):
def __init__(self):
gdb.Command.__init__(self, _weenix_command_prefix, gdb.COMMAND_DATA, gdb.COMPLETE_COMMAND, True)
def invoke(self, arg, tty):
if (len(arg) != 0):
print ("'{0}' is not a valid {1} command".format(arg, _weenix_command_prefix))
print("valid {0} commands are:".format(_weenix_command_prefix))
for command in _weenix_command_names:
print(" {0}".format(command))
print ("run 'help {0} <command>' for details on a particular command".format(_weenix_command_prefix))
WeenixPrefixCommand()
class Command(gdb.Command):
def __init__(self, name, command_class, completer_class=None, prefix=False):
if (len(name.split()) == 1):
_weenix_command_names.append(name)
_weenix_command_names.sort()
name = "{0} {1}".format(_weenix_command_prefix, name)
if (completer_class == None):
gdb.Command.__init__(self, name, command_class, prefix=prefix)
else:
gdb.Command.__init__(self, name, command_class, completer_class, prefix=prefix)
_weenix_param_names = list()
class WeenixSetPrefixCommand(gdb.Command):
def __init__(self):
gdb.Command.__init__(self, "set " + _weenix_command_prefix, gdb.COMMAND_DATA, gdb.COMPLETE_COMMAND, True)
def invoke(self, arg, tty):
if (len(arg) != 0):
print("'{0}' is not a valid {1} parameter".format(arg, _weenix_command_prefix))
print("valid {0} parameters are:".format(_weenix_command_prefix))
for param in _weenix_param_names:
print(" {0}".format(param))
print("run 'help {0} <param>' for details on a particular parameter".format(_weenix_command_prefix))
WeenixSetPrefixCommand()
class WeenixShowPrefixCommand(gdb.Command):
def __init__(self):
gdb.Command.__init__(self, "show " + _weenix_command_prefix, gdb.COMMAND_DATA, gdb.COMPLETE_COMMAND, True)
def invoke(self, arg, tty):
if (len(arg) != 0):
print("'{0}' is not a valid {1} parameter".format(arg, _weenix_command_prefix))
print("valid {0} parameters are:".format(_weenix_command_prefix))
for param in _weenix_param_names:
print(" {0}".format(param))
print("run 'help {0} <param>' for details on a particular parameter".format(_weenix_command_prefix))
WeenixShowPrefixCommand()
class Parameter(gdb.Parameter):
def __init__(self, name, command_class, parameter_class, enum=None):
_weenix_param_names.append(name)
_weenix_param_names.sort()
name = "{0} {1}".format(_weenix_command_prefix, name)
if (None == enum):
gdb.Parameter.__init__(self, name, command_class, parameter_class)
else:
gdb.Parameter.__init__(self, name, command_class, parameter_class, enum)
class Flag(weenix.Parameter):
def __init__(self, name, command_class, default=False):
self._name = name
self.value = default
self._final = None
weenix.Parameter.__init__(self, name, command_class, gdb.PARAM_BOOLEAN)
weenix.Hook("boot", self.boot_callback)
def boot_callback(self, args):
self._final = self.value
self.callback(self._final)
def callback(self, value):
None
def get_set_string(self):
if (None == self._final):
return "{0} is {1}".format(self._name, "enabled" if self.value else "disabled")
else:
self.value = self._final
return "{0} parameter cannot be changed once Weenix has booted".format(self._name)
def get_show_string(self, value):
return "{0} is {1}".format(self._name, value)
class WeenixError(gdb.GdbError):
def __init__(self, msg):
self.__msg = msg
def __str__(self):
return self.__msg
class Hook(gdb.Breakpoint):
def __init__(self, name, callback):
gdb.Breakpoint.__init__(self, "__py_hook_" + name, internal=True)
self.callback = callback
def stop(self):
frame = weenix.stack.Frame(gdb.newest_frame())
self.callback(frame.args())
return False
class TypeError(WeenixError):
def __init__(self, actual, expected, name=None):
self.actual = actual
self.expected = expected
clarification = ""
if (str(expected) != str(expected.strip_typedefs())):
clarification = " ('{0}')".format(expected.strip_typedefs())
if (name == None):
name = "value"
else:
name = "'{0}'".format(name)
WeenixError.__init__(
self, "{0} has type '{1}', expected '{2}'{3}"
.format(name, actual, expected, clarification))
def assert_type(value, expected, unqualified=True):
if (type(value) == str):
try:
name = value
actual = gdb.parse_and_eval(value).type
except RuntimeError as err:
raise WeenixError(str(err))
elif (type(value) == gdb.Value):
name = None
actual = value.type
elif (type(value) == gdb.Type):
name = None
actual = value
else:
raise RuntimeError("bad first argument: {0}".format(value))
expect = expected
if (unqualified):
actual = actual.unqualified()
expect = expect.unqualified()
expected = expected.unqualified()
actual = actual.strip_typedefs()
expect = expect.strip_typedefs()
if (not str(actual) == str(expect)):
raise TypeError(actual, expected, name)
class EvalFunctionHelper(gdb.Function):
def __init__(self):
gdb.Function.__init__(self, self.name())
self._count = 0
self._vals = dict()
def name(self):
return "__wnx_val"
def register(self, value):
if (not isinstance(value, gdb.Value)):
raise TypeError("expected gdb.Value")
self._count += 1
self._vals[self._count] = value
return self._count
def invoke(self, index):
val = self._vals[int(index)]
del self._vals[int(index)]
return val
_weenix_eval_func_helper = EvalFunctionHelper()
def value_to_string(value):
index = _weenix_eval_func_helper.register(value)
return "${0}({1})".format(_weenix_eval_func_helper.name(), index)
def eval_func(name, *args):
argstr = ""
for i, arg in enumerate(args):
if (isinstance(arg, gdb.Value)):
arg = value_to_string(arg)
argstr += "{0},".format(arg)
argstr = argstr[:-1]
return gdb.parse_and_eval("{0}({1})".format(name, argstr))
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