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fhdl/verilog: support special lowering and overrides

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This commit is contained in:
Sebastien Bourdeauducq 2013-02-23 19:03:16 +01:00
parent 3a591c358c
commit 7c4e6c35e5
1 changed files with 29 additions and 4 deletions
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33
migen/fhdl/verilog.py
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@ -208,10 +208,32 @@ def _printsync(f, ns, clock_domains):
r += "end\n\n"
return r
def _printspecials(f, ns, clock_domains):
def _call_special_classmethod(overrides, obj, method, *args, **kwargs):
cl = obj.__class__
if cl in overrides:
cl = overrides[cl]
if hasattr(cl, method):
return getattr(cl, method)(obj, *args, **kwargs)
else:
return None
def _lower_specials(overrides, specials):
f = Fragment()
lowered_specials = set()
for special in sorted(specials, key=lambda x: x.huid):
impl = _call_special_classmethod(overrides, special, "lower")
if impl is not None:
f += impl.get_fragment()
lowered_specials.add(special)
return f, lowered_specials
def _printspecials(overrides, specials, ns, clock_domains):
r = ""
for special in sorted(f.specials, key=lambda x: x.huid):
r += special.emit_verilog(special, ns, clock_domains)
for special in sorted(specials, key=lambda x: x.huid):
pr = _call_special_classmethod(overrides, special, "emit_verilog", ns, clock_domains)
if pr is None:
raise NotImplementedError("Special " + str(special) + " failed to implement emit_verilog")
r += pr
return r
def _printinit(f, ios, ns):
@ -230,6 +252,7 @@ def _printinit(f, ios, ns):
def convert(f, ios=None, name="top",
clock_domains=None,
return_ns=False,
special_overrides=dict(),
display_run=False):
if ios is None:
ios = set()
@ -242,6 +265,8 @@ def convert(f, ios=None, name="top",
ios.add(cd.rst)
f = lower_arrays(f)
fs, lowered_specials = _lower_specials(special_overrides, f.specials)
f += fs
ns = build_namespace(list_signals(f) \
| list_special_ios(f, True, True, True) \
@ -251,7 +276,7 @@ def convert(f, ios=None, name="top",
r += _printheader(f, ios, name, ns)
r += _printcomb(f, ns, display_run)
r += _printsync(f, ns, clock_domains)
r += _printspecials(f, ns, clock_domains)
r += _printspecials(special_overrides, f.specials - lowered_specials, ns, clock_domains)
r += _printinit(f, ios, ns)
r += "endmodule\n"