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from migen.fhdl.structure import *
from migen.fhdl.structure import _Operator
class Namespace:
def __init__(self):
self.counts = {}
self.sigs = {}
def get_name(self, sig):
try:
n = self.sigs[sig]
if n:
return sig.name + "_" + str(n)
else:
return sig.name
except KeyError:
try:
n = self.counts[sig.name]
except KeyError:
n = 0
self.sigs[sig] = n
self.counts[sig.name] = n + 1
if n:
return sig.name + "_" + str(n)
else:
return sig.name
def list_signals(node):
if isinstance(node, Constant):
return set()
elif isinstance(node, Signal):
return {node}
elif isinstance(node, _Operator):
l = list(map(list_signals, node.operands))
return set().union(*l)
elif isinstance(node, Slice):
return list_signals(node.value)
elif isinstance(node, Cat):
l = list(map(list_signals, node.l))
return set().union(*l)
elif isinstance(node, Replicate):
return list_signals(node.v)
elif isinstance(node, Assign):
return list_signals(node.l) | list_signals(node.r)
elif isinstance(node, StatementList):
l = list(map(list_signals, node.l))
return set().union(*l)
elif isinstance(node, If):
return list_signals(node.cond) | list_signals(node.t) | list_signals(node.f)
elif isinstance(node, Case):
l = list(map(lambda x: list_signals(x[1]), node.cases))
return list_signals(node.test).union(*l).union(list_signals(node.default))
elif isinstance(node, Fragment):
return list_signals(node.comb) | list_signals(node.sync)
else:
raise TypeError
def list_targets(node):
if isinstance(node, Signal):
return {node}
elif isinstance(node, Slice):
return list_targets(node.value)
elif isinstance(node, Cat):
l = list(map(list_targets, node.l))
return set().union(*l)
elif isinstance(node, Replicate):
return list_targets(node.v)
elif isinstance(node, Assign):
return list_targets(node.l)
elif isinstance(node, StatementList):
l = list(map(list_targets, node.l))
return set().union(*l)
elif isinstance(node, If):
return list_targets(node.t) | list_targets(node.f)
elif isinstance(node, Case):
l = list(map(lambda x: list_targets(x[1]), node.cases))
return list_targets(node.default).union(*l)
elif isinstance(node, Fragment):
return list_targets(node.comb) | list_targets(node.sync)
else:
raise TypeError
def list_inst_outs(i):
if isinstance(i, Fragment):
return list_inst_outs(i.instances)
else:
l = []
for x in i:
l += list(map(lambda x: x[1], list(x.outs.items())))
return set(l)
def is_variable(node):
if isinstance(node, Signal):
return node.variable
elif isinstance(node, Slice):
return is_variable(node.value)
elif isinstance(node, Cat):
arevars = list(map(is_variable, node.l))
r = arevars[0]
for x in arevars:
if x != r:
raise TypeError
return r
else:
raise TypeError
def insert_reset(rst, sl):
targets = list_targets(sl)
resetcode = [t.eq(t.reset) for t in targets]
return If(rst, *resetcode).Else(*sl.l)
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