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import dis
import os.path
import re
import subprocess
import sys
import types
import unittest
from test.support import findfile, run_unittest
def abspath(filename):
return os.path.abspath(findfile(filename, subdir="dtracedata"))
def normalize_trace_output(output):
"""Normalize DTrace output for comparison.
DTrace keeps a per-CPU buffer, and when showing the fired probes, buffers
are concatenated. So if the operating system moves our thread around, the
straight result can be "non-causal". So we add timestamps to the probe
firing, sort by that field, then strip it from the output"""
# When compiling with '--with-pydebug', strip '[# refs]' debug output.
output = re.sub(r"\[[0-9]+ refs\]", "", output)
try:
result = [
row.split("\t")
for row in output.splitlines()
if row and not row.startswith('#')
]
result.sort(key=lambda row: int(row[0]))
result = [row[1] for row in result]
return "\n".join(result)
except (IndexError, ValueError):
raise AssertionError(
"tracer produced unparseable output:\n{}".format(output)
)
class TraceBackend:
EXTENSION = None
COMMAND = None
COMMAND_ARGS = []
def run_case(self, name, optimize_python=None):
actual_output = normalize_trace_output(self.trace_python(
script_file=abspath(name + self.EXTENSION),
python_file=abspath(name + ".py"),
optimize_python=optimize_python))
with open(abspath(name + self.EXTENSION + ".expected")) as f:
expected_output = f.read().rstrip()
return (expected_output, actual_output)
def generate_trace_command(self, script_file, subcommand=None):
command = self.COMMAND + [script_file]
if subcommand:
command += ["-c", subcommand]
return command
def trace(self, script_file, subcommand=None):
command = self.generate_trace_command(script_file, subcommand)
stdout, _ = subprocess.Popen(command,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
universal_newlines=True).communicate()
return stdout
def trace_python(self, script_file, python_file, optimize_python=None):
python_flags = []
if optimize_python:
python_flags.extend(["-O"] * optimize_python)
subcommand = " ".join([sys.executable] + python_flags + [python_file])
return self.trace(script_file, subcommand)
def assert_usable(self):
try:
output = self.trace(abspath("assert_usable" + self.EXTENSION))
output = output.strip()
except (FileNotFoundError, PermissionError) as fnfe:
output = str(fnfe)
if output != "probe: success":
raise unittest.SkipTest(
"{}(1) failed: {}".format(self.COMMAND[0], output)
)
class DTraceBackend(TraceBackend):
EXTENSION = ".d"
COMMAND = ["dtrace", "-q", "-s"]
class SystemTapBackend(TraceBackend):
EXTENSION = ".stp"
COMMAND = ["stap", "-g"]
class TraceTests(unittest.TestCase):
# unittest.TestCase options
maxDiff = None
# TraceTests options
backend = None
optimize_python = 0
@classmethod
def setUpClass(self):
self.backend.assert_usable()
def run_case(self, name):
actual_output, expected_output = self.backend.run_case(
name, optimize_python=self.optimize_python)
self.assertEqual(actual_output, expected_output)
def test_function_entry_return(self):
self.run_case("call_stack")
def test_verify_call_opcodes(self):
"""Ensure our call stack test hits all function call opcodes"""
opcodes = set(["CALL_FUNCTION", "CALL_FUNCTION_EX", "CALL_FUNCTION_KW"])
with open(abspath("call_stack.py")) as f:
code_string = f.read()
def get_function_instructions(funcname):
# Recompile with appropriate optimization setting
code = compile(source=code_string,
filename="<string>",
mode="exec",
optimize=self.optimize_python)
for c in code.co_consts:
if isinstance(c, types.CodeType) and c.co_name == funcname:
return dis.get_instructions(c)
return []
for instruction in get_function_instructions('start'):
opcodes.discard(instruction.opname)
self.assertEqual(set(), opcodes)
def test_gc(self):
self.run_case("gc")
def test_line(self):
self.run_case("line")
class DTraceNormalTests(TraceTests):
backend = DTraceBackend()
optimize_python = 0
class DTraceOptimizedTests(TraceTests):
backend = DTraceBackend()
optimize_python = 2
class SystemTapNormalTests(TraceTests):
backend = SystemTapBackend()
optimize_python = 0
class SystemTapOptimizedTests(TraceTests):
backend = SystemTapBackend()
optimize_python = 2
def test_main():
run_unittest(DTraceNormalTests, DTraceOptimizedTests, SystemTapNormalTests,
SystemTapOptimizedTests)
if __name__ == '__main__':
test_main()
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