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#
# RTEMS Chains Support
# Copyright 2010 Chris Johns (chrisj@rtems.org)
#
# $Id$
#
import gdb
class node:
"""Manage the Chain_Node."""
def __init__(self, node_val):
self.node_val = node_val
def null(self):
return self.node_val['next'] == 0
def next(self):
if not self.null():
self.node_val = self.node_val['next'].dereference()
def previous(self):
if not self.null():
self.node_val = self.node_val['previous'].dereference()
def cast(self, typename):
if not self.null():
nodetype = gdb.lookup_type(typename)
return self.node_val.cast(nodetype)
return None
class control:
"""Manage the Chain_Control."""
def __init__(self, ctrl):
self.ctrl = ctrl
def first(self):
return node(self.ctrl['first'].dereference())
def last(self):
return node(self.ctrl['first'])
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