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gh-104280: Add test cases for DTrace probes by furkanonder · Pull Request #107125 · python/cpython · GitHub

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82 changes: 82 additions & 0 deletions Lib/test/test_dtrace.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
import re
import subprocess
import sys
import sysconfig
import types
import unittest

Expand Down Expand Up @@ -173,6 +174,87 @@ class SystemTapOptimizedTests(TraceTests, unittest.TestCase):
backend = SystemTapBackend()
optimize_python = 2

class CheckDtraceProbes(unittest.TestCase):
@classmethod
def setUpClass(cls):
if sysconfig.get_config_var('WITH_DTRACE'):
readelf_major_version, readelf_minor_version = cls.get_readelf_version()
if support.verbose:
print(f"readelf version: {readelf_major_version}.{readelf_minor_version}")
else:
raise unittest.SkipTest("CPython must be configured with the --with-dtrace option.")


@staticmethod
def get_readelf_version():
try:
cmd = ["readelf", "--version"]
proc = subprocess.Popen(
cmd,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
universal_newlines=True,
)
with proc:
version, stderr = proc.communicate()

if proc.returncode:
raise Exception(
f"Command {' '.join(cmd)!r} failed "
f"with exit code {proc.returncode}: "
f"stdout={version!r} stderr={stderr!r}"
)
except OSError:
raise unittest.SkipTest("Couldn't find readelf on the path")

# Regex to parse:
# 'GNU readelf (GNU Binutils) 2.40.0\n' -> 2.40
match = re.search(r"^(?:GNU) readelf.*?\b(\d+)\.(\d+)", version)
if match is None:
raise unittest.SkipTest(f"Unable to parse readelf version: {version}")

return int(match.group(1)), int(match.group(2))

def get_readelf_output(self):
command = ["readelf", "-n", sys.executable]
stdout, _ = subprocess.Popen(
command,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
universal_newlines=True,
).communicate()
return stdout

def test_check_probes(self):
readelf_output = self.get_readelf_output()

available_probe_names = [
"Name: import__find__load__done",
"Name: import__find__load__start",
"Name: audit",
"Name: gc__start",
"Name: gc__done",
]

for probe_name in available_probe_names:
with self.subTest(probe_name=probe_name):
self.assertIn(probe_name, readelf_output)

@unittest.expectedFailure
def test_missing_probes(self):
readelf_output = self.get_readelf_output()

# Missing probes will be added in the future.
missing_probe_names = [
"Name: function__entry",
"Name: function__return",
"Name: line",
]

for probe_name in missing_probe_names:
with self.subTest(probe_name=probe_name):
self.assertIn(probe_name, readelf_output)


if __name__ == '__main__':
unittest.main()

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