# Copyright (C) 2021 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/>.

import gdb
from gdb.unwinder import Unwinder


class FrameId(object):
    def __init__(self, sp, pc):
        self._sp = sp
        self._pc = pc

    @property
    def sp(self):
        return self._sp

    @property
    def pc(self):
        return self._pc


class TestUnwinder(Unwinder):
    def __init__(self):
        Unwinder.__init__(self, "show level")

    def __call__(self, pending_frame):
        pc_desc = pending_frame.architecture().registers().find("pc")
        pc = pending_frame.read_register(pc_desc)

        block = gdb.block_for_pc(int(pc))
        if block is None:
            return None
        func = block.function
        if func is None:
            return None

        print("Func %s, Level %d" % (str(func), pending_frame.level()))

        # This unwinder never claims any frames.
        return None


gdb.unwinder.register_unwinder(None, TestUnwinder(), True)