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"""All things relating to regression capabilities."""
import time
import inspect
from itertools import product
import sys
import os
import traceback
if "COCOTB_SIM" in os.environ:
import simulator
else:
simulator = None
# Optional support for coverage collection of testbench files
coverage = None
if "COVERAGE" in os.environ:
try:
import coverage
except ImportError as e:
msg = ("Coverage collection requested but coverage module not available"
"\n"
"Import error was: %s\n" % repr(e))
sys.stderr.write(msg)
import cocotb
import cocotb.ANSI as ANSI
from cocotb.log import SimLog
from cocotb.result import TestSuccess, SimFailure
from cocotb.utils import get_sim_time, remove_traceback_frames, want_color_output
from cocotb.xunit_reporter import XUnitReporter
from cocotb import _py_compat
def _my_import(name):
mod = __import__(name)
components = name.split('.')
for comp in components[1:]:
mod = getattr(mod, comp)
return mod
class RegressionManager(object):
"""Encapsulates all regression capability into a single place"""
def __init__(self, root_name, modules, tests=None, seed=None, hooks=[]):
"""
Args:
root_name (str): The name of the root handle.
modules (list): A list of Python module names to run.
tests (list, optional): A list of tests to run.
Defaults to ``None``, meaning all discovered tests will be run.
seed (int, optional): The seed for the random number generator to use.
Defaults to ``None``.
hooks (list, optional): A list of hook modules to import.
Defaults to the empty list.
"""
self._queue = []
self._root_name = root_name
self._dut = None
self._modules = modules
self._functions = tests
self._running_test = None
self._cov = None
self.log = SimLog("cocotb.regression")
self._seed = seed
self._hooks = hooks
def initialise(self):
self.start_time = time.time()
self.test_results = []
self.ntests = 0
self.count = 1
self.skipped = 0
self.failures = 0
results_filename = os.getenv('COCOTB_RESULTS_FILE', "results.xml")
suite_name = os.getenv('RESULT_TESTSUITE', "all")
package_name = os.getenv('RESULT_TESTPACKAGE', "all")
self.xunit = XUnitReporter(filename=results_filename)
self.xunit.add_testsuite(name=suite_name, tests=repr(self.ntests),
package=package_name)
if (self._seed is not None):
self.xunit.add_property(name="random_seed", value=("%d"%self._seed))
if coverage is not None:
self.log.info("Enabling coverage collection of Python code")
self._cov = coverage.coverage(branch=True, omit=["*cocotb*"])
self._cov.start()
handle = simulator.get_root_handle(self._root_name)
self._dut = cocotb.handle.SimHandle(handle) if handle else None
if self._dut is None:
raise AttributeError("Can not find Root Handle (%s)" %
self._root_name)
# Auto discovery
for module_name in self._modules:
try:
self.log.debug("Python Path: " + ",".join(sys.path))
self.log.debug("PWD: " + os.getcwd())
module = _my_import(module_name)
except Exception as E:
self.log.critical("Failed to import module %s: %s", module_name, E)
self.log.info("MODULE variable was \"%s\"", ".".join(self._modules))
self.log.info("Traceback: ")
self.log.info(traceback.format_exc())
raise
if self._functions:
# Specific functions specified, don't auto discover
for test in self._functions.rsplit(','):
try:
_test = getattr(module, test)
except AttributeError:
self.log.error("Requested test %s wasn't found in module %s", test, module_name)
err = AttributeError("Test %s doesn't exist in %s" % (test, module_name))
_py_compat.raise_from(err, None) # discard nested traceback
if not hasattr(_test, "im_test"):
self.log.error("Requested %s from module %s isn't a cocotb.test decorated coroutine", test, module_name)
raise ImportError("Failed to find requested test %s" % test)
self._queue.append(_test(self._dut))
self.ntests += 1
break
for thing in vars(module).values():
if hasattr(thing, "im_test"):
try:
test = thing(self._dut)
skip = test.skip
except Exception:
skip = True
self.log.warning("Failed to initialize test %s" %
thing.name, exc_info=True)
if skip:
self.log.info("Skipping test %s" % thing.name)
self.xunit.add_testcase(name=thing.name,
classname=module_name,
time="0.0",
sim_time_ns="0.0",
ratio_time="0.0")
self.xunit.add_skipped()
self.skipped += 1
self._store_test_result(module_name, thing.name, None, 0.0, 0.0, 0.0)
else:
self._queue.append(test)
self.ntests += 1
self._queue.sort(key=lambda test: test.sort_name())
for valid_tests in self._queue:
self.log.info("Found test %s.%s" %
(valid_tests.module,
valid_tests.funcname))
for module_name in self._hooks:
self.log.info("Loading hook from module '"+module_name+"'")
module = _my_import(module_name)
for thing in vars(module).values():
if hasattr(thing, "im_hook"):
try:
test = thing(self._dut)
except Exception:
self.log.warning("Failed to initialize hook %s" % thing.name, exc_info=True)
else:
cocotb.scheduler.add(test)
def tear_down(self):
"""It's the end of the world as we know it"""
if self.failures:
self.log.error("Failed %d out of %d tests (%d skipped)" %
(self.failures, self.count - 1, self.skipped))
else:
self.log.info("Passed %d tests (%d skipped)" %
(self.count - 1, self.skipped))
if self._cov:
self._cov.stop()
self.log.info("Writing coverage data")
self._cov.save()
self._cov.html_report()
if len(self.test_results) > 0:
self._log_test_summary()
self._log_sim_summary()
self.log.info("Shutting down...")
self.xunit.write()
simulator.stop_simulator()
def next_test(self):
"""Get the next test to run"""
if not self._queue:
return None
return self._queue.pop(0)
def _add_failure(self, result):
self.xunit.add_failure(stdout=repr(str(result)),
stderr="\n".join(self._running_test.error_messages),
message="Test failed with random_seed={}".format(self._seed))
self.failures += 1
def handle_result(self, test):
"""Handle a test completing.
Dump result to XML and schedule the next test (if any).
Args:
test: The test that completed
"""
assert test is self._running_test
real_time = time.time() - test.start_time
sim_time_ns = get_sim_time('ns') - test.start_sim_time
ratio_time = self._safe_divide(sim_time_ns, real_time)
self.xunit.add_testcase(name=test.funcname,
classname=test.module,
time=repr(real_time),
sim_time_ns=repr(sim_time_ns),
ratio_time=repr(ratio_time))
# Helper for logging result
def _result_was():
result_was = ("{} (result was {})".format
(test.funcname, result.__class__.__name__))
return result_was
result_pass = True
# check what exception the test threw
try:
test._outcome.get()
except Exception as e:
if sys.version_info >= (3, 5):
result = remove_traceback_frames(e, ['handle_result', 'get'])
# newer versions of the `logging` module accept plain exception objects
exc_info = result
elif sys.version_info >= (3,):
result = remove_traceback_frames(e, ['handle_result', 'get'])
# newer versions of python have Exception.__traceback__
exc_info = (type(result), result, result.__traceback__)
else:
# Python 2
result = e
exc_info = remove_traceback_frames(sys.exc_info(), ['handle_result', 'get'])
else:
result = TestSuccess()
if (isinstance(result, TestSuccess) and
not test.expect_fail and
not test.expect_error):
self.log.info("Test Passed: %s" % test.funcname)
elif (isinstance(result, AssertionError) and
test.expect_fail):
self.log.info("Test failed as expected: " + _result_was())
elif (isinstance(result, TestSuccess) and
test.expect_error):
self.log.error("Test passed but we expected an error: " +
_result_was())
self._add_failure(result)
result_pass = False
elif isinstance(result, TestSuccess):
self.log.error("Test passed but we expected a failure: " +
_result_was())
self._add_failure(result)
result_pass = False
elif isinstance(result, SimFailure):
if isinstance(result, test.expect_error):
self.log.info("Test errored as expected: " + _result_was())
else:
self.log.error("Test error has lead to simulator shutting us "
"down", exc_info=exc_info)
self._add_failure(result)
self._store_test_result(test.module, test.funcname, False, sim_time_ns, real_time, ratio_time)
self.tear_down()
return
elif test.expect_error:
if isinstance(result, test.expect_error):
self.log.info("Test errored as expected: " + _result_was())
else:
self.log.info("Test errored with unexpected type: " + _result_was())
self._add_failure(result)
result_pass = False
else:
self.log.error("Test Failed: " + _result_was(), exc_info=exc_info)
self._add_failure(result)
result_pass = False
self._store_test_result(test.module, test.funcname, result_pass, sim_time_ns, real_time, ratio_time)
self.execute()
def execute(self):
self._running_test = cocotb.regression_manager.next_test()
if self._running_test:
start = ''
end = ''
if want_color_output():
start = ANSI.COLOR_TEST
end = ANSI.COLOR_DEFAULT
# Want this to stand out a little bit
self.log.info("%sRunning test %d/%d:%s %s" %
(start,
self.count, self.ntests,
end,
self._running_test.funcname))
cocotb.scheduler.add_test(self._running_test)
self.count += 1
else:
self.tear_down()
def _log_test_summary(self):
TEST_FIELD = 'TEST'
RESULT_FIELD = 'PASS/FAIL'
SIM_FIELD = 'SIM TIME(NS)'
REAL_FIELD = 'REAL TIME(S)'
RATIO_FIELD = 'RATIO(NS/S)'
TEST_FIELD_LEN = max(len(TEST_FIELD),len(max([x['test'] for x in self.test_results],key=len)))
RESULT_FIELD_LEN = len(RESULT_FIELD)
SIM_FIELD_LEN = len(SIM_FIELD)
REAL_FIELD_LEN = len(REAL_FIELD)
RATIO_FIELD_LEN = len(RATIO_FIELD)
LINE_LEN = 3 + TEST_FIELD_LEN + 2 + RESULT_FIELD_LEN + 2 + SIM_FIELD_LEN + 2 + REAL_FIELD_LEN + 2 + RATIO_FIELD_LEN + 3
LINE_SEP = "*"*LINE_LEN+"\n"
summary = ""
summary += LINE_SEP
summary += "** {a:<{a_len}} {b:^{b_len}} {c:>{c_len}} {d:>{d_len}} {e:>{e_len}} **\n".format(a=TEST_FIELD, a_len=TEST_FIELD_LEN,
b=RESULT_FIELD, b_len=RESULT_FIELD_LEN,
c=SIM_FIELD, c_len=SIM_FIELD_LEN,
d=REAL_FIELD, d_len=REAL_FIELD_LEN,
e=RATIO_FIELD, e_len=RATIO_FIELD_LEN)
summary += LINE_SEP
for result in self.test_results:
hilite = ''
if result['pass'] is None:
pass_fail_str = "N/A"
elif result['pass']:
pass_fail_str = "PASS"
else:
pass_fail_str = "FAIL"
if want_color_output():
hilite = ANSI.COLOR_HILITE_SUMMARY
summary += "{start}** {a:<{a_len}} {b:^{b_len}} {c:>{c_len}.2f} {d:>{d_len}.2f} {e:>{e_len}.2f} **\n".format(a=result['test'], a_len=TEST_FIELD_LEN,
b=pass_fail_str, b_len=RESULT_FIELD_LEN,
c=result['sim'], c_len=SIM_FIELD_LEN-1,
d=result['real'], d_len=REAL_FIELD_LEN-1,
e=result['ratio'], e_len=RATIO_FIELD_LEN-1,
start=hilite)
summary += LINE_SEP
self.log.info(summary)
def _log_sim_summary(self):
real_time = time.time() - self.start_time
sim_time_ns = get_sim_time('ns')
ratio_time = self._safe_divide(sim_time_ns, real_time)
summary = ""
summary += "*************************************************************************************\n"
summary += "** ERRORS : {0:<39}**\n".format(self.failures)
summary += "*************************************************************************************\n"
summary += "** SIM TIME : {0:<39}**\n".format('{0:.2f} NS'.format(sim_time_ns))
summary += "** REAL TIME : {0:<39}**\n".format('{0:.2f} S'.format(real_time))
summary += "** SIM / REAL TIME : {0:<39}**\n".format('{0:.2f} NS/S'.format(ratio_time))
summary += "*************************************************************************************\n"
self.log.info(summary)
@staticmethod
def _safe_divide(a, b):
try:
return a / b
except ZeroDivisionError:
if a == 0:
return float('nan')
else:
return float('inf')
def _store_test_result(self, module_name, test_name, result_pass, sim_time, real_time, ratio):
result = {
'test' : '.'.join([module_name, test_name]),
'pass' : result_pass,
'sim' : sim_time,
'real' : real_time,
'ratio' : ratio}
self.test_results.append(result)
def _create_test(function, name, documentation, mod, *args, **kwargs):
"""Factory function to create tests, avoids late binding.
Creates a test dynamically. The test will call the supplied
function with the supplied arguments.
Args:
function (function): The test function to run.
name (str): The name of the test.
documentation (str): The docstring for the test.
mod (module): The module this function belongs to.
*args: Remaining args to pass to test function.
**kwargs: Passed to the test function.
Returns:
Decorated test function
"""
def _my_test(dut):
yield function(dut, *args, **kwargs)
_my_test.__name__ = name
_my_test.__doc__ = documentation
_my_test.__module__ = mod.__name__
return cocotb.test()(_my_test)
[docs]class TestFactory(object):
"""Factory to automatically generate tests.
Args:
test_function: The function that executes a test.
Must take *dut* as the first argument.
*args: Remaining arguments are passed directly to the test function.
Note that these arguments are not varied. An argument that
varies with each test must be a keyword argument to the
test function.
**kwargs: Remaining keyword arguments are passed directly to the test function.
Note that these arguments are not varied. An argument that
varies with each test must be a keyword argument to the
test function.
Assuming we have a common test function that will run a test. This test
function will take keyword arguments (for example generators for each of
the input interfaces) and generate tests that call the supplied function.
This Factory allows us to generate sets of tests based on the different
permutations of the possible arguments to the test function.
For example if we have a module that takes backpressure and idles and
have some packet generation routines ``gen_a`` and ``gen_b``:
>>> tf = TestFactory(test_function=run_test)
>>> tf.add_option(name='data_in', optionlist=[gen_a, gen_b])
>>> tf.add_option('backpressure', [None, random_backpressure])
>>> tf.add_option('idles', [None, random_idles])
>>> tf.generate_tests()
We would get the following tests:
* ``gen_a`` with no backpressure and no idles
* ``gen_a`` with no backpressure and ``random_idles``
* ``gen_a`` with ``random_backpressure`` and no idles
* ``gen_a`` with ``random_backpressure`` and ``random_idles``
* ``gen_b`` with no backpressure and no idles
* ``gen_b`` with no backpressure and ``random_idles``
* ``gen_b`` with ``random_backpressure`` and no idles
* ``gen_b`` with ``random_backpressure`` and ``random_idles``
The tests are appended to the calling module for auto-discovery.
Tests are simply named ``test_function_N``. The docstring for the test (hence
the test description) includes the name and description of each generator.
"""
def __init__(self, test_function, *args, **kwargs):
if not isinstance(test_function, cocotb.coroutine):
raise TypeError("TestFactory requires a cocotb coroutine")
self.test_function = test_function
self.name = self.test_function._func.__name__
self.args = args
self.kwargs_constant = kwargs
self.kwargs = {}
self.log = SimLog("cocotb.regression")
[docs] def add_option(self, name, optionlist):
"""Add a named option to the test.
Args:
name (str): Name of the option. Passed to test as a keyword
argument.
optionlist (list): A list of possible options for this test knob.
"""
self.kwargs[name] = optionlist
[docs] def generate_tests(self, prefix="", postfix=""):
"""
Generate an exhaustive set of tests using the cartesian product of the
possible keyword arguments.
The generated tests are appended to the namespace of the calling
module.
Args:
prefix (str): Text string to append to start of ``test_function`` name
when naming generated test cases. This allows reuse of
a single ``test_function`` with multiple
:class:`TestFactories <.TestFactory>` without name clashes.
postfix (str): Text string to append to end of ``test_function`` name
when naming generated test cases. This allows reuse of
a single ``test_function`` with multiple
:class:`TestFactories <.TestFactory>` without name clashes.
"""
frm = inspect.stack()[1]
mod = inspect.getmodule(frm[0])
d = self.kwargs
for index, testoptions in enumerate((
dict(zip(d, v)) for v in
product(*d.values())
)):
name = "%s%s%s_%03d" % (prefix, self.name, postfix, index + 1)
doc = "Automatically generated test\n\n"
for optname, optvalue in testoptions.items():
if callable(optvalue):
if not optvalue.__doc__:
desc = "No docstring supplied"
else:
desc = optvalue.__doc__.split('\n')[0]
doc += "\t%s: %s (%s)\n" % (optname, optvalue.__name__,
desc)
else:
doc += "\t%s: %s\n" % (optname, repr(optvalue))
self.log.debug("Adding generated test \"%s\" to module \"%s\"" %
(name, mod.__name__))
kwargs = {}
kwargs.update(self.kwargs_constant)
kwargs.update(testoptions)
if hasattr(mod, name):
self.log.error("Overwriting %s in module %s. "
"This causes a previously defined testcase "
"not to be run. Consider setting/changing "
"name_postfix" % (name, mod))
setattr(mod, name, _create_test(self.test_function, name, doc, mod,
*self.args, **kwargs))