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fhdl.xfrm: add tests for ResetInserter, CEInserter.

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This commit is contained in:
whitequark 2018-12-13 08:39:02 +00:00
parent b1a89ef5fd
commit 19aa404628
2 changed files with 182 additions and 16 deletions
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52
nmigen/fhdl/xfrm.py
View file

@ -89,36 +89,58 @@ class StatementTransformer:
return self.on_statement(value)
class _ControlInserter:
def __init__(self, controls):
if isinstance(controls, Value):
controls = {"sys": controls}
self.controls = OrderedDict(controls)
def __call__(self, fragment):
new_fragment = Fragment()
class FragmentTransformer:
def map_subfragments(self, fragment, new_fragment):
for subfragment, name in fragment.subfragments:
new_fragment.add_subfragment(self(subfragment), name)
def map_statements(self, fragment, new_fragment):
if hasattr(self, "on_statement"):
new_fragment.add_statements(map(self.on_statement, fragment.statements))
else:
new_fragment.add_statements(fragment.statements)
def map_drivers(self, fragment, new_fragment):
for cd_name, signals in fragment.iter_domains():
for signal in signals:
new_fragment.drive(signal, cd_name)
if cd_name is None or cd_name not in self.controls:
continue
self._wrap_control(new_fragment, cd_name, signals)
def on_fragment(self, fragment):
new_fragment = Fragment()
self.map_subfragments(fragment, new_fragment)
self.map_statements(fragment, new_fragment)
self.map_drivers(fragment, new_fragment)
return new_fragment
def _wrap_control(self, fragment, cd_name, signals):
raise NotImplementedError
def __call__(self, value):
return self.on_fragment(value)
class _ControlInserter(FragmentTransformer):
def __init__(self, controls):
if isinstance(controls, Value):
controls = {"sync": controls}
self.controls = OrderedDict(controls)
def on_fragment(self, fragment):
new_fragment = super().on_fragment(fragment)
for cd_name, signals in fragment.iter_domains():
if cd_name is None or cd_name not in self.controls:
continue
self._insert_control(new_fragment, cd_name, signals)
return new_fragment
def _insert_control(self, fragment, cd_name, signals):
raise NotImplementedError # :nocov:
class ResetInserter(_ControlInserter):
def _wrap_control(self, fragment, cd_name, signals):
def _insert_control(self, fragment, cd_name, signals):
stmts = [s.eq(Const(s.reset, s.nbits)) for s in signals if not s.reset_less]
fragment.add_statements(Switch(self.controls[cd_name], {1: stmts}))
class CEInserter(_ControlInserter):
def _wrap_control(self, fragment, cd_name, signals):
def _insert_control(self, fragment, cd_name, signals):
stmts = [s.eq(s) for s in signals]
fragment.add_statements(Switch(self.controls[cd_name], {0: stmts}))

144
nmigen/test/test_fhdl_xfrm.py Normal file
View file

@ -0,0 +1,144 @@
import re
import unittest
from nmigen.fhdl.ast import *
from nmigen.fhdl.ir import *
from nmigen.fhdl.xfrm import *
class ResetInserterTestCase(unittest.TestCase):
def setUp(self):
self.s1 = Signal()
self.s2 = Signal(reset=1)
self.s3 = Signal(reset=1, reset_less=True)
self.c1 = Signal()
def assertRepr(self, obj, repr_str):
obj = Statement.wrap(obj)
repr_str = re.sub(r"\s+", " ", repr_str)
repr_str = re.sub(r"\( (?=\()", "(", repr_str)
repr_str = re.sub(r"\) (?=\))", ")", repr_str)
self.assertEqual(repr(obj), repr_str.strip())
def test_reset_default(self):
f = Fragment()
f.add_statements(
self.s1.eq(1)
)
f.drive(self.s1, "sync")
f = ResetInserter(self.c1)(f)
self.assertRepr(f.statements, """
(
(eq (sig s1) (const 1'd1))
(switch (sig c1)
(case 1 (eq (sig s1) (const 1'd0)))
)
)
""")
def test_reset_cd(self):
f = Fragment()
f.add_statements(
self.s1.eq(1),
self.s2.eq(0),
)
f.drive(self.s1, "sync")
f.drive(self.s2, "pix")
f = ResetInserter({"pix": self.c1})(f)
self.assertRepr(f.statements, """
(
(eq (sig s1) (const 1'd1))
(eq (sig s2) (const 0'd0))
(switch (sig c1)
(case 1 (eq (sig s2) (const 1'd1)))
)
)
""")
def test_reset_value(self):
f = Fragment()
f.add_statements(
self.s2.eq(0)
)
f.drive(self.s2, "sync")
f = ResetInserter(self.c1)(f)
self.assertRepr(f.statements, """
(
(eq (sig s2) (const 0'd0))
(switch (sig c1)
(case 1 (eq (sig s2) (const 1'd1)))
)
)
""")
def test_reset_less(self):
f = Fragment()
f.add_statements(
self.s3.eq(0)
)
f.drive(self.s3, "sync")
f = ResetInserter(self.c1)(f)
self.assertRepr(f.statements, """
(
(eq (sig s3) (const 0'd0))
(switch (sig c1)
(case 1 )
)
)
""")
class CEInserterTestCase(unittest.TestCase):
def setUp(self):
self.s1 = Signal()
self.s2 = Signal()
self.s3 = Signal()
self.c1 = Signal()
def assertRepr(self, obj, repr_str):
obj = Statement.wrap(obj)
repr_str = re.sub(r"\s+", " ", repr_str)
repr_str = re.sub(r"\( (?=\()", "(", repr_str)
repr_str = re.sub(r"\) (?=\))", ")", repr_str)
self.assertEqual(repr(obj), repr_str.strip())
def test_ce_default(self):
f = Fragment()
f.add_statements(
self.s1.eq(1)
)
f.drive(self.s1, "sync")
f = CEInserter(self.c1)(f)
self.assertRepr(f.statements, """
(
(eq (sig s1) (const 1'd1))
(switch (sig c1)
(case 0 (eq (sig s1) (sig s1)))
)
)
""")
def test_ce_cd(self):
f = Fragment()
f.add_statements(
self.s1.eq(1),
self.s2.eq(0),
)
f.drive(self.s1, "sync")
f.drive(self.s2, "pix")
f = CEInserter({"pix": self.c1})(f)
self.assertRepr(f.statements, """
(
(eq (sig s1) (const 1'd1))
(eq (sig s2) (const 0'd0))
(switch (sig c1)
(case 0 (eq (sig s2) (sig s2)))
)
)
""")