""" Example 5: Making use of PyRTL and Introspection. """
+from collections.abc import Sequence
+
from nmigen import Signal
+from nmigen.hdl.rec import Record
+from nmigen import tracer
from nmigen.compat.fhdl.bitcontainer import value_bits_sign
+from contextlib import contextmanager
+
+from nmoperator import eq
+from singlepipe import StageCls, ControlBase, BufferedHandshake
+from singlepipe import UnbufferedPipeline
+
# The following example shows how pyrtl can be used to make some interesting
# hardware structures using python introspection. In particular, this example
# stages, and new members with names not starting with "_" are to be registered
# for the next stage.
-class SimplePipeline(object):
+def like(value, rname, pipe, pipemode=False):
+ if isinstance(value, ObjectProxy):
+ return ObjectProxy.like(pipe, value, pipemode=pipemode,
+ name=rname, reset_less=True)
+ else:
+ return Signal(value_bits_sign(value), name=rname,
+ reset_less=True)
+ return Signal.like(value, name=rname, reset_less=True)
+
+def get_assigns(_assigns):
+ assigns = []
+ for e in _assigns:
+ if isinstance(e, ObjectProxy):
+ assigns += get_assigns(e._assigns)
+ else:
+ assigns.append(e)
+ return assigns
+
+
+def get_eqs(_eqs):
+ eqs = []
+ for e in _eqs:
+ if isinstance(e, ObjectProxy):
+ eqs += get_eqs(e._eqs)
+ else:
+ eqs.append(e)
+ return eqs
+
+
+class ObjectProxy:
+ def __init__(self, m, name=None, pipemode=False, syncmode=True):
+ self._m = m
+ if name is None:
+ name = tracer.get_var_name(default=None)
+ self.name = name
+ self._pipemode = pipemode
+ self._syncmode = syncmode
+ self._eqs = {}
+ self._assigns = []
+ self._preg_map = {}
+
+ @classmethod
+ def like(cls, m, value, pipemode=False, name=None, src_loc_at=0, **kwargs):
+ name = name or tracer.get_var_name(depth=2 + src_loc_at,
+ default="$like")
+
+ src_loc_at_1 = 1 + src_loc_at
+ r = ObjectProxy(m, value.name, pipemode)
+ #for a, aname in value._preg_map.items():
+ # r._preg_map[aname] = like(a, aname, m, pipemode)
+ for a in value.ports():
+ aname = a.name
+ r._preg_map[aname] = like(a, aname, m, pipemode)
+ return r
+
+ def __repr__(self):
+ subobjs = []
+ for a in self.ports():
+ aname = a.name
+ ai = self._preg_map[aname]
+ subobjs.append(repr(ai))
+ return "<OP %s>" % subobjs
+
+ def get_specs(self, liked=False):
+ res = []
+ for k, v in self._preg_map.items():
+ #v = like(v, k, stage._m)
+ res.append(v)
+ if isinstance(v, ObjectProxy):
+ res += v.get_specs()
+ return res
+
+ def eq(self, i):
+ print ("ObjectProxy eq", self, i)
+ res = []
+ for a in self.ports():
+ aname = a.name
+ ai = i._preg_map[aname]
+ res.append(a.eq(ai))
+ return res
+
+ def ports(self):
+ res = []
+ for aname, a in self._preg_map.items():
+ if isinstance(a, Signal) or isinstance(a, ObjectProxy) or \
+ isinstance(a, Record):
+ res.append(a)
+ #print ("ObjectPorts", res)
+ return res
+
+ def __getattr__(self, name):
+ try:
+ v = self._preg_map[name]
+ return v
+ #return like(v, name, self._m)
+ except KeyError:
+ raise AttributeError(
+ 'error, no pipeline register "%s" defined for OP %s'
+ % (name, self.name))
+
+ def __setattr__(self, name, value):
+ if name.startswith('_') or name in ['name', 'ports', 'eq', 'like']:
+ # do not do anything tricky with variables starting with '_'
+ object.__setattr__(self, name, value)
+ return
+ #rname = "%s_%s" % (self.name, name)
+ rname = name
+ new_pipereg = like(value, rname, self._m, self._pipemode)
+ self._preg_map[name] = new_pipereg
+ #object.__setattr__(self, name, new_pipereg)
+ if self._pipemode:
+ #print ("OP pipemode", self._syncmode, new_pipereg, value)
+ assign = eq(new_pipereg, value)
+ if self._syncmode:
+ self._m.d.sync += assign
+ else:
+ self._m.d.comb += assign
+ elif self._m:
+ #print ("OP !pipemode assign", new_pipereg, value, type(value))
+ self._m.d.comb += eq(new_pipereg, value)
+ else:
+ #print ("OP !pipemode !m", new_pipereg, value, type(value))
+ self._assigns += eq(new_pipereg, value)
+ if isinstance(value, ObjectProxy):
+ #print ("OP, defer assigns:", value._assigns)
+ self._assigns += value._assigns
+ self._eqs.append(value._eqs)
+
+
+class PipelineStage:
+ """ Pipeline builder stage with auto generation of pipeline registers.
+ """
+
+ def __init__(self, name, m, prev=None, pipemode=False, ispec=None):
+ self._m = m
+ self._stagename = name
+ self._preg_map = {'__nextstage__': {}}
+ self._prev_stage = prev
+ self._ispec = ispec
+ if ispec:
+ self._preg_map[self._stagename] = ispec
+ if prev:
+ print ("prev", prev._stagename, prev._preg_map)
+ #if prev._stagename in prev._preg_map:
+ # m = prev._preg_map[prev._stagename]
+ # self._preg_map[prev._stagename] = m
+ if '__nextstage__' in prev._preg_map:
+ m = prev._preg_map['__nextstage__']
+ m = likedict(m)
+ self._preg_map[self._stagename] = m
+ #for k, v in m.items():
+ #m[k] = like(v, k, self._m)
+ print ("make current", self._stagename, m)
+ self._pipemode = pipemode
+ self._eqs = {}
+ self._assigns = []
+
+ def __getattribute__(self, name):
+ if name.startswith('_'):
+ return object.__getattribute__(self, name)
+ #if name in self._preg_map['__nextstage__']:
+ # return self._preg_map['__nextstage__'][name]
+ try:
+ print ("getattr", name, object.__getattribute__(self, '_preg_map'))
+ v = self._preg_map[self._stagename][name]
+ return v
+ #return like(v, name, self._m)
+ except KeyError:
+ raise AttributeError(
+ 'error, no pipeline register "%s" defined for stage %s'
+ % (name, self._stagename))
+
+ def __setattr__(self, name, value):
+ if name.startswith('_'):
+ # do not do anything tricky with variables starting with '_'
+ object.__setattr__(self, name, value)
+ return
+ pipereg_id = self._stagename
+ rname = 'pipereg_' + pipereg_id + '_' + name
+ new_pipereg = like(value, rname, self._m, self._pipemode)
+ next_stage = '__nextstage__'
+ if next_stage not in self._preg_map:
+ self._preg_map[next_stage] = {}
+ self._preg_map[next_stage][name] = new_pipereg
+ print ("setattr", name, value, self._preg_map)
+ if self._pipemode:
+ self._eqs[name] = new_pipereg
+ assign = eq(new_pipereg, value)
+ print ("pipemode: append", new_pipereg, value, assign)
+ if isinstance(value, ObjectProxy):
+ print ("OP, assigns:", value._assigns)
+ self._assigns += value._assigns
+ self._eqs[name]._eqs = value._eqs
+ #self._m.d.comb += assign
+ self._assigns += assign
+ elif self._m:
+ print ("!pipemode: assign", new_pipereg, value)
+ assign = eq(new_pipereg, value)
+ self._m.d.sync += assign
+ else:
+ print ("!pipemode !m: defer assign", new_pipereg, value)
+ assign = eq(new_pipereg, value)
+ self._eqs[name] = new_pipereg
+ self._assigns += assign
+ if isinstance(value, ObjectProxy):
+ print ("OP, defer assigns:", value._assigns)
+ self._assigns += value._assigns
+ self._eqs[name]._eqs = value._eqs
+
+def likelist(specs):
+ res = []
+ for v in specs:
+ res.append(like(v, v.name, None, pipemode=True))
+ return res
+
+def likedict(specs):
+ if not isinstance(specs, dict):
+ return like(specs, specs.name, None, pipemode=True)
+ res = {}
+ for k, v in specs.items():
+ res[k] = likedict(v)
+ return res
+
+
+class AutoStage(StageCls):
+ def __init__(self, inspecs, outspecs, eqs, assigns):
+ self.inspecs, self.outspecs = inspecs, outspecs
+ self.eqs, self.assigns = eqs, assigns
+ #self.o = self.ospec()
+ def ispec(self): return likedict(self.inspecs)
+ def ospec(self): return likedict(self.outspecs)
+
+ def process(self, i):
+ print ("stage process", i)
+ return self.eqs
+
+ def setup(self, m, i):
+ print ("stage setup i", i, m)
+ print ("stage setup inspecs", self.inspecs)
+ print ("stage setup outspecs", self.outspecs)
+ print ("stage setup eqs", self.eqs)
+ #self.o = self.ospec()
+ m.d.comb += eq(self.inspecs, i)
+ #m.d.comb += eq(self.outspecs, self.eqs)
+ #m.d.comb += eq(self.o, i)
+
+
+class AutoPipe(UnbufferedPipeline):
+ def __init__(self, stage, assigns):
+ UnbufferedPipeline.__init__(self, stage)
+ self.assigns = assigns
+
+ def elaborate(self, platform):
+ m = UnbufferedPipeline.elaborate(self, platform)
+ m.d.comb += self.assigns
+ print ("assigns", self.assigns, m)
+ return m
+
+
+class PipeManager:
+ def __init__(self, m, pipemode=False, pipetype=None):
+ self.m = m
+ self.pipemode = pipemode
+ self.pipetype = pipetype
+
+ @contextmanager
+ def Stage(self, name, prev=None, ispec=None):
+ if ispec:
+ ispec = likedict(ispec)
+ print ("start stage", name, ispec)
+ stage = PipelineStage(name, None, prev, self.pipemode, ispec=ispec)
+ try:
+ yield stage, self.m #stage._m
+ finally:
+ pass
+ if self.pipemode:
+ if stage._ispec:
+ print ("use ispec", stage._ispec)
+ inspecs = stage._ispec
+ else:
+ inspecs = self.get_specs(stage, name)
+ #inspecs = likedict(inspecs)
+ outspecs = self.get_specs(stage, '__nextstage__', liked=True)
+ print ("stage inspecs", name, inspecs)
+ print ("stage outspecs", name, outspecs)
+ eqs = stage._eqs # get_eqs(stage._eqs)
+ assigns = get_assigns(stage._assigns)
+ print ("stage eqs", name, eqs)
+ print ("stage assigns", name, assigns)
+ s = AutoStage(inspecs, outspecs, eqs, assigns)
+ self.stages.append(s)
+ print ("end stage", name, self.pipemode, "\n")
+
+ def get_specs(self, stage, name, liked=False):
+ return stage._preg_map[name]
+ if name in stage._preg_map:
+ res = []
+ for k, v in stage._preg_map[name].items():
+ #v = like(v, k, stage._m)
+ res.append(v)
+ #if isinstance(v, ObjectProxy):
+ # res += v.get_specs()
+ return res
+ return {}
+
+ def __enter__(self):
+ self.stages = []
+ return self
+
+ def __exit__(self, *args):
+ print ("exit stage", args)
+ pipes = []
+ cb = ControlBase()
+ for s in self.stages:
+ print ("stage specs", s, s.inspecs, s.outspecs)
+ if self.pipetype == 'buffered':
+ p = BufferedHandshake(s)
+ else:
+ p = AutoPipe(s, s.assigns)
+ pipes.append(p)
+ self.m.submodules += p
+
+ self.m.d.comb += cb.connect(pipes)
+
+
+class SimplePipeline:
""" Pipeline builder with auto generation of pipeline registers.
"""
- def __init__(self, pipe):
- self._pipe = pipe
+ def __init__(self, m):
+ self._m = m
self._pipeline_register_map = {}
self._current_stage_num = 0
if name.startswith('_'):
# do not do anything tricky with variables starting with '_'
object.__setattr__(self, name, value)
+ return
+ next_stage = self._current_stage_num + 1
+ pipereg_id = str(self._current_stage_num) + 'to' + str(next_stage)
+ rname = 'pipereg_' + pipereg_id + '_' + name
+ #new_pipereg = Signal(value_bits_sign(value), name=rname,
+ # reset_less=True)
+ if isinstance(value, ObjectProxy):
+ new_pipereg = ObjectProxy.like(self._m, value,
+ name=rname, reset_less = True)
else:
- next_stage = self._current_stage_num + 1
- pipereg_id = str(self._current_stage_num) + 'to' + str(next_stage)
- rname = 'pipereg_' + pipereg_id + '_' + name
- new_pipereg = Signal(value_bits_sign(value), name=rname,
- reset_less=True)
- if next_stage not in self._pipeline_register_map:
- self._pipeline_register_map[next_stage] = {}
- self._pipeline_register_map[next_stage][name] = new_pipereg
- self._pipe.sync += new_pipereg.eq(value)
+ new_pipereg = Signal.like(value, name=rname, reset_less = True)
+ if next_stage not in self._pipeline_register_map:
+ self._pipeline_register_map[next_stage] = {}
+ self._pipeline_register_map[next_stage][name] = new_pipereg
+ self._m.d.sync += eq(new_pipereg, value)
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