litex/migen/actorlib/sim.py

97 lines
2.6 KiB
Python

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