75 lines
2.2 KiB
Python
75 lines
2.2 KiB
Python
from collections import defaultdict, OrderedDict
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from ..tools import *
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from .ast import *
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__all__ = ["Fragment"]
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class Fragment:
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def __init__(self):
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self.ports = ValueSet()
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self.drivers = OrderedDict()
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self.statements = []
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self.subfragments = []
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def add_ports(self, *ports):
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self.ports.update(flatten(ports))
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def iter_ports(self):
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yield from self.ports
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def drive(self, signal, cd_name=None):
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if cd_name not in self.drivers:
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self.drivers[cd_name] = ValueSet()
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self.drivers[cd_name].add(signal)
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def iter_domains(self):
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yield from self.drivers.items()
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def iter_drivers(self):
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for cd_name, signals in self.drivers.items():
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for signal in signals:
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yield cd_name, signal
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def iter_comb(self):
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yield from self.drivers[None]
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def iter_sync(self):
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for cd_name, signals in self.drivers.items():
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if cd_name is None:
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continue
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for signal in signals:
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yield cd_name, signal
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def add_statements(self, *stmts):
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self.statements += Statement.wrap(stmts)
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def add_subfragment(self, subfragment, name=None):
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assert isinstance(subfragment, Fragment)
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self.subfragments.append((subfragment, name))
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def prepare(self, ports, clock_domains):
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from .xfrm import ResetInserter
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resets = {cd.name: cd.reset for cd in clock_domains.values() if cd.reset is not None}
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frag = ResetInserter(resets)(self)
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self_driven = union(s._lhs_signals() for s in self.statements)
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self_used = union(s._rhs_signals() for s in self.statements)
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ins = self_used - self_driven
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outs = ports & self_driven
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for n, (subfrag, name) in enumerate(frag.subfragments):
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subfrag, sub_ins, sub_outs = subfrag.prepare(ports=self_used | ports,
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clock_domains=clock_domains)
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frag.subfragments[n] = (subfrag, name)
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ins |= sub_ins - self_driven
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outs |= ports & sub_outs
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frag.add_ports(ins, outs)
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return frag, ins, outs
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