litex/migen/fhdl/convtools.py

108 lines
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from .structure import *
class Namespace:
def __init__(self):
self.counts = {}
self.sigs = {}
def GetName(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 ListSignals(node):
if isinstance(node, Constant):
return set()
elif isinstance(node, Signal):
return {node}
elif isinstance(node, Operator):
l = list(map(ListSignals, node.operands))
return set().union(*l)
elif isinstance(node, Slice):
return ListSignals(node.value)
elif isinstance(node, Cat):
l = list(map(ListSignals, node.l))
return set().union(*l)
elif isinstance(node, Assign):
return ListSignals(node.l) | ListSignals(node.r)
elif isinstance(node, StatementList):
l = list(map(ListSignals, node.l))
return set().union(*l)
elif isinstance(node, If):
return ListSignals(node.cond) | ListSignals(node.t) | ListSignals(node.f)
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elif isinstance(node, Case):
l = list(map(lambda x: ListSignals(x[1]), node.cases))
return ListSignals(node.test).union(*l).union(ListSignals(node.default))
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elif isinstance(node, Fragment):
return ListSignals(node.comb) | ListSignals(node.sync)
else:
raise TypeError
def ListTargets(node):
if isinstance(node, Signal):
return {node}
elif isinstance(node, Slice):
return ListTargets(node.value)
elif isinstance(node, Cat):
l = list(map(ListTargets, node.l))
return set().union(*l)
elif isinstance(node, Assign):
return ListTargets(node.l)
elif isinstance(node, StatementList):
l = list(map(ListTargets, node.l))
return set().union(*l)
elif isinstance(node, If):
return ListTargets(node.t) | ListTargets(node.f)
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elif isinstance(node, Case):
l = list(map(lambda x: ListTargets(x[1]), node.cases))
return ListTargets(node.default).union(*l)
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elif isinstance(node, Fragment):
return ListTargets(node.comb) | ListTargets(node.sync)
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else:
raise TypeError
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def ListInstOuts(i):
if isinstance(i, Fragment):
return ListInstOuts(i.instances)
else:
l = []
for x in i:
l += list(map(lambda x: x[1], list(x.outs.items())))
return set(l)
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def IsVariable(node):
if isinstance(node, Signal):
return node.variable
elif isinstance(node, Slice):
return IsVariable(node.value)
elif isinstance(node, Cat):
arevars = list(map(IsVariable, node.l))
r = arevars[0]
for x in arevars:
if x != r:
raise TypeError
return r
else:
raise TypeError
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def InsertReset(rst, sl):
targets = ListTargets(sl)
resetcode = []
for t in targets:
if not t.variable:
resetcode.append(Assign(t, t.reset))
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return If(rst, resetcode, sl)