def apply_generics(generics, expression):
'''
Resolve generic objects in the expression.
'''
substituted = make_substitute_generics_function(generics)(expression)
value = math_parser.get_value(substituted)
return value
def ports_from_slv(self, slv, generics, direction, subset=None):
'''
Extract port values from an slv string.
'slv': A string of 0's and 1's representing the port data.
'generics': The generic parameters for the entity.
'direction': Whether we are extracting input or output ports.
`subset`: An optional list of the signals present in the slv.
'''
assert direction in ('in', 'out')
pos = 0
outputs = {}
for port in self.ports.values():
if ((port.direction == direction)
and (port.name not in CLOCK_NAMES)
and ((subset is None) or (port.name in subset))):
width_symbol = typs.make_substitute_generics_function(
generics)(port.typ.width)
width = math_parser.get_value(width_symbol)
intwidth = int(width)
assert width == intwidth
if pos == 0:
piece = slv[-intwidth:]
else:
piece = slv[-pos - intwidth:-pos]
pos += intwidth
port_value = port.typ.from_slv(piece, generics)
outputs[port.name] = port_value
return outputs
def __init__(self, identifier, size):
self.identifier = identifier
self.size = size
self.width = size
size_value = math_parser.get_value(size)
self.max_value = pow(2, size_value - 1) - 1
self.min_value = -pow(2, size_value - 1)
def output_width(self, generics):
width = 0
for port in self.output_ports().values():
width_symbol = typs.make_substitute_generics_function(generics)(
port.typ.width)
width += math_parser.get_value(width_symbol)
return width
def value(self):
'''
Determine the value of this constant.
'''
return math_parser.get_value(self.expression)