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# Copyright (C) 2013-2020 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# This file is part of the GDB testsuite. It tests Python-based
# frame-filters.
import gdb
import itertools
from gdb.FrameDecorator import FrameDecorator
import copy
class Reverse_Function (FrameDecorator):
def __init__(self, fobj):
super(Reverse_Function, self).__init__(fobj)
self.fobj = fobj
def function (self):
fname = str (self.fobj.function())
if (fname == None or fname == ""):
return None
if fname == 'end_func':
extra = self.fobj.inferior_frame().read_var('str').string()
else:
extra = ''
fname = fname[::-1] + extra
return fname
class Dummy (FrameDecorator):
def __init__(self, fobj):
super(Dummy, self).__init__(fobj)
self.fobj = fobj
def function (self):
return "Dummy function"
def address (self):
return 0x123
def filename (self):
return "Dummy filename"
def frame_args (self):
return [("Foo",gdb.Value(12)),("Bar","Stuff"), ("FooBar",42)]
def frame_locals (self):
return []
def line (self):
return 0
def elided (self):
return None
class FrameFilter ():
def __init__ (self):
self.name = "Reverse"
self.priority = 100
self.enabled = True
gdb.frame_filters [self.name] = self
def filter (self, frame_iter):
# Python 3.x moved the itertools.imap functionality to map(),
# so check if it is available.
if hasattr(itertools, "imap"):
frame_iter = itertools.imap (Reverse_Function,
frame_iter)
else:
frame_iter = map(Reverse_Function, frame_iter)
return frame_iter
class ElidingFrameDecorator(FrameDecorator):
def __init__(self, frame, elided_frames):
super(ElidingFrameDecorator, self).__init__(frame)
self.elided_frames = elided_frames
def elided(self):
return iter(self.elided_frames)
def address (self):
# Regression test for an overflow in the python layer.
bitsize = 8 * gdb.lookup_type('void').pointer().sizeof
mask = (1 << bitsize) - 1
return 0xffffffffffffffff & mask
class ElidingIterator:
def __init__(self, ii):
self.input_iterator = ii
def __iter__(self):
return self
def next(self):
frame = next(self.input_iterator)
if str(frame.function()) != 'func1':
return frame
# Suppose we want to return the 'func1' frame but elide the
# next frame. E.g., if call in our interpreter language takes
# two C frames to implement, and the first one we see is the
# "sentinel".
elided = next(self.input_iterator)
return ElidingFrameDecorator(frame, [elided])
# Python 3.x requires __next__(self) while Python 2.x requires
# next(self). Define next(self), and for Python 3.x create this
# wrapper.
def __next__(self):
return self.next()
class FrameElider ():
def __init__ (self):
self.name = "Elider"
self.priority = 900
self.enabled = True
gdb.frame_filters [self.name] = self
def filter (self, frame_iter):
return ElidingIterator (frame_iter)
# This is here so the test can change the kind of error that is
# thrown.
name_error = RuntimeError
# A simple decorator that gives an error when computing the function.
class ErrorInName(FrameDecorator):
def __init__(self, frame):
FrameDecorator.__init__(self, frame)
def function(self):
raise name_error('whoops')
# A filter that supplies buggy frames. Disabled by default.
class ErrorFilter():
def __init__ (self):
self.name = "Error"
self.priority = 1
self.enabled = False
gdb.frame_filters [self.name] = self
def filter(self, frame_iter):
# Python 3.x moved the itertools.imap functionality to map(),
# so check if it is available.
if hasattr(itertools, "imap"):
return itertools.imap (ErrorInName, frame_iter)
else:
return map(ErrorInName, frame_iter)
FrameFilter()
FrameElider()
ErrorFilter()
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