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hdl.ir: reject elaboratables that elaborate to themselves.

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Fixes #592.
This commit is contained in:
whitequark 2021-12-11 12:39:34 +00:00
parent 90777a65c8
commit 599615ee3a
2 changed files with 19 additions and 6 deletions
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16
tests/test_hdl_ir.py
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@ -10,13 +10,18 @@ from amaranth.hdl.mem import *
from .utils import *
class BadElaboratable(Elaboratable):
class ElaboratesToNone(Elaboratable):
def elaborate(self, platform):
return
class ElaboratesToSelf(Elaboratable):
def elaborate(self, platform):
return self
class FragmentGetTestCase(FHDLTestCase):
def test_get_wrong(self):
def test_get_wrong_none(self):
with self.assertRaisesRegex(AttributeError,
r"^Object None cannot be elaborated$"):
Fragment.get(None, platform=None)
@ -25,7 +30,12 @@ class FragmentGetTestCase(FHDLTestCase):
r"^\.elaborate\(\) returned None; missing return statement\?$"):
with self.assertRaisesRegex(AttributeError,
r"^Object None cannot be elaborated$"):
Fragment.get(BadElaboratable(), platform=None)
Fragment.get(ElaboratesToNone(), platform=None)
def test_get_wrong_self(self):
with self.assertRaisesRegex(RecursionError,
r"^Object <.+?ElaboratesToSelf.+?> elaborates to itself$"):
Fragment.get(ElaboratesToSelf(), platform=None)
class FragmentGeneratedTestCase(FHDLTestCase):