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hdl.ir: silence unused elaboratable warning on interpreter crash.

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This commit is contained in:
whitequark 2019-05-26 10:42:52 +00:00
parent d393c5ec64
commit b0ba960296
1 changed files with 13 additions and 0 deletions
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13
nmigen/hdl/ir.py
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@ -14,6 +14,8 @@ __all__ = ["Elaboratable", "DriverConflict", "Fragment", "Instance"]
class Elaboratable(metaclass=ABCMeta):
_Elaboratable__silence = False
def __new__(cls, *args, **kwargs):
self = super().__new__(cls)
self._Elaboratable__traceback = traceback.extract_stack()[:-1]
@ -21,6 +23,8 @@ class Elaboratable(metaclass=ABCMeta):
return self
def __del__(self):
if self._Elaboratable__silence:
return
if hasattr(self, "_Elaboratable__used") and not self._Elaboratable__used:
print("Elaboratable created but never used\n",
"Traceback (most recent call last):\n",
@ -28,6 +32,15 @@ class Elaboratable(metaclass=ABCMeta):
file=sys.stderr, sep="")
_old_excepthook = sys.excepthook
def _silence_elaboratable(type, value, traceback):
# Don't show anything if the interpreter crashed; that'd just obscure the exception
# traceback instead of helping.
Elaboratable._Elaboratable__silence = True
_old_excepthook(type, value, traceback)
sys.excepthook = _silence_elaboratable
class DriverConflict(UserWarning):
pass