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fhdl/verilog: recursive Special lowering

This commit is contained in:
Sebastien Bourdeauducq 2013-04-25 14:56:26 +02:00
parent 67c3119249
commit b862b070d6
1 changed files with 19 additions and 1 deletions
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20
migen/fhdl/verilog.py
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@ -230,7 +230,7 @@ def _call_special_classmethod(overrides, obj, method, *args, **kwargs):
else:
return None
def _lower_specials(overrides, specials):
def _lower_specials_step(overrides, specials):
f = Fragment()
lowered_specials = set()
for special in sorted(specials, key=lambda x: x.huid):
@ -240,6 +240,24 @@ def _lower_specials(overrides, specials):
lowered_specials.add(special)
return f, lowered_specials
def _can_lower(overrides, specials):
for special in specials:
cl = special.__class__
if cl in overrides:
cl = overrides[cl]
if hasattr(cl, "lower"):
return True
return False
def _lower_specials(overrides, specials):
f, lowered_specials = _lower_specials_step(overrides, specials)
while _can_lower(overrides, f.specials):
f2, lowered_specials2 = _lower_specials_step(overrides, f.specials)
f += f2
lowered_specials |= lowered_specials2
f.specials -= lowered_specials2
return f, lowered_specials
def _printspecials(overrides, specials, ns):
r = ""
for special in sorted(specials, key=lambda x: x.huid):