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back.pysim: handle non-driven, non-port signals.

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Fixes #20.
This commit is contained in:
whitequark 2019-01-13 08:31:38 +00:00
parent 06faeee357
commit cbf7bd6e31
2 changed files with 19 additions and 1 deletions
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6
nmigen/back/pysim.py
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@ -90,6 +90,9 @@ class _RHSValueCompiler(_ValueCompiler):
def on_Signal(self, value):
if self.sensitivity is not None:
self.sensitivity.add(value)
if value not in self.signal_slots:
# A signal that is neither driven nor a port always remains at its reset state.
return lambda state: value.reset
value_slot = self.signal_slots[value]
if self.signal_mode == "rhs":
return lambda state: state.curr[value_slot]
@ -551,7 +554,8 @@ class Simulator:
funclet = compiler(statements)
def add_funclet(signal, funclet):
self._funclets[self._signal_slots[signal]].add(funclet)
if signal in self._signal_slots:
self._funclets[self._signal_slots[signal]].add(funclet)
for signal in compiler.sensitivity:
add_funclet(signal, funclet)