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# RTEMS Tools Project (http://www.rtems.org/)
# Copyright 2010-2014 Chris Johns (chrisj@rtems.org)
# All rights reserved.
#
# This file is part of the RTEMS Tools package in 'rtems-tools'.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
#
# RTEMS Chains Support
#
import gdb
class node:
"""Manage the Chain_Node."""
def __init__(self, node_val):
if node_val:
if node_val.type.code == gdb.TYPE_CODE_PTR:
self.reference = node_val
self.node_val = node_val.dereference()
else:
self.node_val = node_val
self.reference = node_val.address
else:
self.node_val = node_val
def __str__(self):
return self.to_string()
def null(self):
if not self.node_val:
return True
return False
def next(self):
if not self.null():
return self.node_val['next']
def previous(self):
if not self.null():
return self.node_val['previous']
def cast(self, typename):
if not self.null():
nodetype = gdb.lookup_type(typename)
return self.node_val.cast(nodetype)
return None
def to_string(self):
if self.null():
return 'NULL'
return 'Node:%s Next:%s Prev:%s' % (self.reference,
self.node_val['next'],
self.node_val['previous'])
class control:
"""Manage the Chain_Control."""
def __init__(self, ctrl):
if ctrl.type.code == gdb.TYPE_CODE_PTR:
self.reference = ctrl
self.ctrl = ctrl.dereference()
else:
self.ctrl = ctrl
self.reference = ctrl.address
def first(self):
t = node(self.ctrl['Head']['Node'])
return t
def tail(self):
return node(self.ctrl['Tail']['Node'])
def empty(self):
if self.tail().previous() == self.reference:
return True
return False
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