70 lines
1.9 KiB
Python
70 lines
1.9 KiB
Python
from migen.fhdl.structure import *
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from migen.flow.actor import *
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from migen.sim.generic import PureSimulable
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class Token:
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def __init__(self, endpoint, value=None):
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self.endpoint = endpoint
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self.value = value
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# Generators yield None or a tuple of Tokens.
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# Tokens for Sink endpoints are pulled and the "value" field filled in.
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# Tokens for Source endpoints are pushed according to their "value" field.
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#
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# NB: the possibility to push several tokens at once is important to interact
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# with actors that only accept a group of tokens when all of them are available.
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class SimActor(PureSimulable, Actor):
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def __init__(self, generator, *endpoint_descriptions, **misc):
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self.generator = generator
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self.active = set()
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self.done = False
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super().__init__(*endpoint_descriptions, **misc)
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def _process_transactions(self, s):
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completed = set()
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for token in self.active:
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ep = self.endpoints[token.endpoint]
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if isinstance(ep, Sink):
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if s.rd(ep.ack):
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if s.rd(ep.stb):
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token.value = s.multiread(ep.token)
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completed.add(token)
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s.wr(ep.ack, 0)
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else:
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s.wr(ep.ack, 1)
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elif isinstance(ep, Source):
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if s.rd(ep.stb):
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if s.rd(ep.ack):
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completed.add(token)
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s.wr(ep.stb, 0)
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else:
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s.wr(ep.stb, 1)
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s.multiwrite(ep.token, token.value)
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else:
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raise TypeError
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self.active -= completed
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def _next_transactions(self):
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try:
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transactions = next(self.generator)
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except StopIteration:
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self.done = True
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transactions = None
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if isinstance(transactions, Token):
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self.active = {transactions}
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elif isinstance(transactions, tuple) \
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or isinstance(transactions, list) \
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or isinstance(transactions, set):
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self.active = set(transactions)
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elif transactions is None:
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self.active = set()
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else:
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raise TypeError
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def do_simulation(self, s):
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if not self.done:
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if not self.active:
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self._next_transactions()
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if self.active:
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self._process_transactions(s)
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