# Copyright (c) 2013 Potential Ventures Ltd
# Copyright (c) 2013 SolarFlare Communications Inc
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#
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# modification, are permitted provided that the following conditions are met:
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# notice, this list of conditions and the following disclaimer.
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# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
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# SolarFlare Communications Inc nor the
# names of its contributors may be used to endorse or promote products
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# TODO: Could use cStringIO?
import traceback
import sys
import warnings
from io import StringIO
"""Exceptions and functions for simulation result handling."""
[docs]def raise_error(obj, msg):
"""Create a :exc:`TestError` exception and raise it after printing a traceback.
.. deprecated:: 1.3
Raise a standard Python exception instead of calling this function.
A stacktrace will be printed by cocotb automatically if the exception is unhandled.
Args:
obj: Object with a log method.
msg (str): The log message.
"""
warnings.warn(
"``raise_error`` is deprecated - raise a standard Exception instead",
DeprecationWarning, stacklevel=2)
_raise_error(obj, msg)
def _raise_error(obj, msg):
exc_info = sys.exc_info()
buff = StringIO()
traceback.print_exception(*exc_info, file=buff)
obj.log.error("%s\n%s" % (msg, buff.getvalue()))
exception = TestError(msg)
exception.stderr.write(buff.getvalue())
raise exception
[docs]def create_error(obj, msg):
"""Like :func:`raise_error`, but return the exception rather than raise it,
simply to avoid too many levels of nested `try/except` blocks.
.. deprecated:: 1.3
Raise a standard Python exception instead of calling this function.
Args:
obj: Object with a log method.
msg (str): The log message.
"""
warnings.warn(
"``create_error`` is deprecated - raise a standard Exception instead",
DeprecationWarning, stacklevel=2)
try:
# use the private version to avoid multiple warnings
_raise_error(obj, msg)
except TestError as error:
return error
return TestError("Creating error traceback failed")
[docs]class ReturnValue(Exception):
"""
Helper exception needed for Python versions prior to 3.3.
.. deprecated:: 1.4
Use a :keyword:`return` statement instead; this works in all supported versions of Python.
"""
def __init__(self, retval):
warnings.warn(
"``ReturnValue`` is deprecated, use a normal return statement instead.",
DeprecationWarning,
stacklevel=2)
self.retval = retval
[docs]class TestComplete(Exception):
"""Exception showing that the test was completed. Sub-exceptions detail the exit status."""
def __init__(self, *args, **kwargs):
super(TestComplete, self).__init__(*args, **kwargs)
self.stdout = StringIO()
self.stderr = StringIO()
[docs]class ExternalException(Exception):
"""Exception thrown by :class:`cocotb.external` functions."""
def __init__(self, exception):
self.exception = exception
[docs]class TestError(TestComplete):
"""
Exception showing that the test was completed with severity Error.
.. deprecated:: 1.5
Raise a standard Python exception instead.
A stacktrace will be printed by cocotb automatically if the exception is unhandled.
"""
def __init__(self, *args, **kwargs):
warnings.warn(
"TestError is deprecated - raise a standard Exception instead",
DeprecationWarning, stacklevel=2)
super().__init__(*args, **kwargs)
[docs]class TestFailure(TestComplete, AssertionError):
"""Exception showing that the test was completed with severity Failure."""
pass
[docs]class TestSuccess(TestComplete):
"""Exception showing that the test was completed successfully."""
pass
[docs]class SimFailure(TestComplete):
"""Exception showing that the simulator exited unsuccessfully."""
pass
[docs]class SimTimeoutError(TimeoutError):
"""Exception for when a timeout, in terms of simulation time, occurs."""
pass