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Name	Size	Permission	Date
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test_glob.py	18.21 KB	-rw-r--r--	2026-04-20 11:09
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tf_inherit_check.py	714 B	-rw-r--r--	2026-04-20 11:09
time_hashlib.py	2.87 KB	-rw-r--r--	2026-04-20 11:09
win_console_handler.py	1.38 KB	-rw-r--r--	2026-04-20 11:09
xmltests.py	499 B	-rw-r--r--	2026-04-20 11:09
zip_cp437_header.zip	270 B	-rw-r--r--	2026-03-03 16:09
zipdir.zip	374 B	-rw-r--r--	2026-03-03 16:09
zipdir_backslash.zip	192 B	-rw-r--r--	2026-03-03 16:09

Rename

import unittest
import string
import subprocess
import sys
import sysconfig
import os
import pathlib
from test import support
from test.support.script_helper import (
    make_script,
    assert_python_failure,
    assert_python_ok,
)
from test.support.os_helper import temp_dir

if not support.has_subprocess_support:
    raise unittest.SkipTest("test module requires subprocess")

if support.check_sanitizer(address=True, memory=True, ub=True):
    # gh-109580: Skip the test because it does crash randomly if Python is
    # built with ASAN.
    raise unittest.SkipTest("test crash randomly on ASAN/MSAN/UBSAN build")

def supports_trampoline_profiling():
    perf_trampoline = sysconfig.get_config_var("PY_HAVE_PERF_TRAMPOLINE")
    if not perf_trampoline:
        return False
    return int(perf_trampoline) == 1

if not supports_trampoline_profiling():
    raise unittest.SkipTest("perf trampoline profiling not supported")

class TestPerfTrampoline(unittest.TestCase):
    def setUp(self):
        super().setUp()
        self.perf_files = set(pathlib.Path("/tmp/").glob("perf-*.map"))

def tearDown(self) -> None:
        super().tearDown()
        files_to_delete = (
            set(pathlib.Path("/tmp/").glob("perf-*.map")) - self.perf_files
        )
        for file in files_to_delete:
            file.unlink()

def test_trampoline_works(self):
        code = """if 1:
                def foo():
                    pass

def bar():
                    foo()

def baz():
                    bar()

baz()
                """
        with temp_dir() as script_dir:
            script = make_script(script_dir, "perftest", code)
            with subprocess.Popen(
                [sys.executable, "-Xperf", script],
                text=True,
                stderr=subprocess.PIPE,
                stdout=subprocess.PIPE,
            ) as process:
                stdout, stderr = process.communicate()

self.assertEqual(stderr, "")
        self.assertEqual(stdout, "")

perf_file = pathlib.Path(f"/tmp/perf-{process.pid}.map")
        self.assertTrue(perf_file.exists())
        perf_file_contents = perf_file.read_text()
        perf_lines = perf_file_contents.splitlines();
        expected_symbols = [f"py::foo:{script}", f"py::bar:{script}", f"py::baz:{script}"]
        for expected_symbol in expected_symbols:
            perf_line = next((line for line in perf_lines if expected_symbol in line), None)
            self.assertIsNotNone(perf_line, f"Could not find {expected_symbol} in perf file")
            perf_addr = perf_line.split(" ")[0]
            self.assertFalse(perf_addr.startswith("0x"), "Address should not be prefixed with 0x")
            self.assertTrue(set(perf_addr).issubset(string.hexdigits), "Address should contain only hex characters")

def test_trampoline_works_with_forks(self):
        code = """if 1:
                import os, sys

def foo_fork():
                    pass

def bar_fork():
                    foo_fork()

def baz_fork():
                    bar_fork()

def foo():
                    pid = os.fork()
                    if pid == 0:
                        print(os.getpid())
                        baz_fork()
                    else:
                        _, status = os.waitpid(-1, 0)
                        sys.exit(status)

def bar():
                    foo()

def baz():
                    bar()

self.assertEqual(process.returncode, 0)
        self.assertEqual(stderr, "")
        child_pid = int(stdout.strip())
        perf_file = pathlib.Path(f"/tmp/perf-{process.pid}.map")
        perf_child_file = pathlib.Path(f"/tmp/perf-{child_pid}.map")
        self.assertTrue(perf_file.exists())
        self.assertTrue(perf_child_file.exists())

perf_file_contents = perf_file.read_text()
        self.assertIn(f"py::foo:{script}", perf_file_contents)
        self.assertIn(f"py::bar:{script}", perf_file_contents)
        self.assertIn(f"py::baz:{script}", perf_file_contents)

child_perf_file_contents = perf_child_file.read_text()
        self.assertIn(f"py::foo_fork:{script}", child_perf_file_contents)
        self.assertIn(f"py::bar_fork:{script}", child_perf_file_contents)
        self.assertIn(f"py::baz_fork:{script}", child_perf_file_contents)

def test_sys_api(self):
        code = """if 1:
                import sys
                def foo():
                    pass

def spam():
                    pass

def bar():
                    sys.deactivate_stack_trampoline()
                    foo()
                    sys.activate_stack_trampoline("perf")
                    spam()

def baz():
                    bar()

sys.activate_stack_trampoline("perf")
                baz()
                """
        with temp_dir() as script_dir:
            script = make_script(script_dir, "perftest", code)
            with subprocess.Popen(
                [sys.executable, script],
                text=True,
                stderr=subprocess.PIPE,
                stdout=subprocess.PIPE,
            ) as process:
                stdout, stderr = process.communicate()

self.assertEqual(stderr, "")
        self.assertEqual(stdout, "")

perf_file = pathlib.Path(f"/tmp/perf-{process.pid}.map")
        self.assertTrue(perf_file.exists())
        perf_file_contents = perf_file.read_text()
        self.assertNotIn(f"py::foo:{script}", perf_file_contents)
        self.assertIn(f"py::spam:{script}", perf_file_contents)
        self.assertIn(f"py::bar:{script}", perf_file_contents)
        self.assertIn(f"py::baz:{script}", perf_file_contents)

def test_sys_api_with_existing_trampoline(self):
        code = """if 1:
                import sys
                sys.activate_stack_trampoline("perf")
                sys.activate_stack_trampoline("perf")
                """
        assert_python_ok("-c", code)

def test_sys_api_with_invalid_trampoline(self):
        code = """if 1:
                import sys
                sys.activate_stack_trampoline("invalid")
                """
        rc, out, err = assert_python_failure("-c", code)
        self.assertIn("invalid backend: invalid", err.decode())

def test_sys_api_get_status(self):
        code = """if 1:
                import sys
                sys.activate_stack_trampoline("perf")
                assert sys.is_stack_trampoline_active() is True
                sys.deactivate_stack_trampoline()
                assert sys.is_stack_trampoline_active() is False
                """
        assert_python_ok("-c", code)

def is_unwinding_reliable():
    cflags = sysconfig.get_config_var("PY_CORE_CFLAGS")
    if not cflags:
        return False
    return "no-omit-frame-pointer" in cflags

def perf_command_works():
    try:
        cmd = ["perf", "--help"]
        stdout = subprocess.check_output(cmd, text=True)
    except (subprocess.SubprocessError, OSError):
        return False

# perf version does not return a version number on Fedora. Use presence
    # of "perf.data" in help as indicator that it's perf from Linux tools.
    if "perf.data" not in stdout:
        return False

# Check that we can run a simple perf run
    with temp_dir() as script_dir:
        try:
            output_file = script_dir + "/perf_output.perf"
            cmd = (
                "perf",
                "record",
                "--no-buildid",
                "--no-buildid-cache",
                "-g",
                "--call-graph=fp",
                "-o",
                output_file,
                "--",
                sys.executable,
                "-c",
                'print("hello")',
            )
            stdout = subprocess.check_output(
                cmd, cwd=script_dir, text=True, stderr=subprocess.STDOUT
            )
        except (subprocess.SubprocessError, OSError):
            return False

if "hello" not in stdout:
            return False

return True

def run_perf(cwd, *args, **env_vars):
    if env_vars:
        env = os.environ.copy()
        env.update(env_vars)
    else:
        env = None
    output_file = cwd + "/perf_output.perf"
    base_cmd = (
        "perf",
        "record",
        "--no-buildid",
        "--no-buildid-cache",
        "-g",
        "--call-graph=fp",
        "-o", output_file,
        "--"
    )
    proc = subprocess.run(
        base_cmd + args,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
        env=env,
        text=True,
    )
    if proc.returncode:
        print(proc.stderr)
        raise ValueError(f"Perf failed with return code {proc.returncode}")

base_cmd = ("perf", "script")
    proc = subprocess.run(
        ("perf", "script", "-i", output_file),
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
        env=env,
        check=True,
        text=True,
    )
    return proc.stdout, proc.stderr

@unittest.skipUnless(perf_command_works(), "perf command doesn't work")
@unittest.skipUnless(is_unwinding_reliable(), "Unwinding is unreliable")
class TestPerfProfiler(unittest.TestCase):
    def setUp(self):
        super().setUp()
        self.perf_files = set(pathlib.Path("/tmp/").glob("perf-*.map"))

def test_python_calls_appear_in_the_stack_if_perf_activated(self):
        with temp_dir() as script_dir:
            code = """if 1:
                def foo(n):
                    x = 0
                    for i in range(n):
                        x += i

def bar(n):
                    foo(n)

def baz(n):
                    bar(n)

baz(10000000)
                """
            script = make_script(script_dir, "perftest", code)
            stdout, stderr = run_perf(script_dir, sys.executable, "-Xperf", script)
            self.assertEqual(stderr, "")

self.assertIn(f"py::foo:{script}", stdout)
            self.assertIn(f"py::bar:{script}", stdout)
            self.assertIn(f"py::baz:{script}", stdout)

def test_python_calls_do_not_appear_in_the_stack_if_perf_activated(self):
        with temp_dir() as script_dir:
            code = """if 1:
                def foo(n):
                    x = 0
                    for i in range(n):
                        x += i

def bar(n):
                    foo(n)

def baz(n):
                    bar(n)

baz(10000000)
                """
            script = make_script(script_dir, "perftest", code)
            stdout, stderr = run_perf(script_dir, sys.executable, script)
            self.assertEqual(stderr, "")

self.assertNotIn(f"py::foo:{script}", stdout)
            self.assertNotIn(f"py::bar:{script}", stdout)
            self.assertNotIn(f"py::baz:{script}", stdout)

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