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cpython/Lib/test/test_capi/test_misc.py

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# Run the _testcapi module tests (tests for the Python/C API): by defn,
# these are all functions _testcapi exports whose name begins with 'test_'.
import _thread
from collections import deque
import contextlib
import importlib.machinery
import importlib.util
import json
import opcode
import os
import pickle
import queue
import random
import sys
import textwrap
import threading
import time
import types
import unittest
import warnings
import weakref
import operator
from test import support
from test.support import MISSING_C_DOCSTRINGS
from test.support import import_helper
from test.support import threading_helper
from test.support import warnings_helper
from test.support import requires_limited_api
from test.support.script_helper import assert_python_failure, assert_python_ok, run_python_until_end
try:
import _posixsubprocess
except ImportError:
_posixsubprocess = None
try:
import _testmultiphase
except ImportError:
_testmultiphase = None
try:
import _testsinglephase
except ImportError:
_testsinglephase = None
try:
import _xxsubinterpreters as _interpreters
except ModuleNotFoundError:
_interpreters = None
# Skip this test if the _testcapi module isn't available.
_testcapi = import_helper.import_module('_testcapi')
import _testinternalcapi
NULL = None
def decode_stderr(err):
return err.decode('utf-8', 'replace').replace('\r', '')
def requires_subinterpreters(meth):
"""Decorator to skip a test if subinterpreters are not supported."""
return unittest.skipIf(_interpreters is None,
'subinterpreters required')(meth)
def testfunction(self):
"""some doc"""
return self
class InstanceMethod:
id = _testcapi.instancemethod(id)
testfunction = _testcapi.instancemethod(testfunction)
class CAPITest(unittest.TestCase):
def test_instancemethod(self):
inst = InstanceMethod()
self.assertEqual(id(inst), inst.id())
self.assertTrue(inst.testfunction() is inst)
self.assertEqual(inst.testfunction.__doc__, testfunction.__doc__)
self.assertEqual(InstanceMethod.testfunction.__doc__, testfunction.__doc__)
InstanceMethod.testfunction.attribute = "test"
self.assertEqual(testfunction.attribute, "test")
self.assertRaises(AttributeError, setattr, inst.testfunction, "attribute", "test")
@support.requires_subprocess()
def test_no_FatalError_infinite_loop(self):
code = textwrap.dedent("""
import _testcapi
from test import support
with support.SuppressCrashReport():
_testcapi.crash_no_current_thread()
""")
run_result, _cmd_line = run_python_until_end('-c', code)
_rc, out, err = run_result
self.assertEqual(out, b'')
# This used to cause an infinite loop.
msg = ("Fatal Python error: PyThreadState_Get: "
"the function must be called with the GIL held, "
"after Python initialization and before Python finalization, "
"but the GIL is released "
"(the current Python thread state is NULL)").encode()
self.assertTrue(err.rstrip().startswith(msg),
err)
def test_memoryview_from_NULL_pointer(self):
self.assertRaises(ValueError, _testcapi.make_memoryview_from_NULL_pointer)
@unittest.skipUnless(_posixsubprocess, '_posixsubprocess required for this test.')
def test_seq_bytes_to_charp_array(self):
# Issue #15732: crash in _PySequence_BytesToCharpArray()
class Z(object):
def __len__(self):
return 1
with self.assertRaisesRegex(TypeError, 'indexing'):
_posixsubprocess.fork_exec(
1,Z(),True,(1, 2),5,6,7,8,9,10,11,12,13,14,True,True,17,False,19,20,21,22,False)
# Issue #15736: overflow in _PySequence_BytesToCharpArray()
class Z(object):
def __len__(self):
return sys.maxsize
def __getitem__(self, i):
return b'x'
self.assertRaises(MemoryError, _posixsubprocess.fork_exec,
1,Z(),True,(1, 2),5,6,7,8,9,10,11,12,13,14,True,True,17,False,19,20,21,22,False)
@unittest.skipUnless(_posixsubprocess, '_posixsubprocess required for this test.')
def test_subprocess_fork_exec(self):
class Z(object):
def __len__(self):
return 1
# Issue #15738: crash in subprocess_fork_exec()
self.assertRaises(TypeError, _posixsubprocess.fork_exec,
Z(),[b'1'],True,(1, 2),5,6,7,8,9,10,11,12,13,14,True,True,17,False,19,20,21,22,False)
@unittest.skipIf(MISSING_C_DOCSTRINGS,
"Signature information for builtins requires docstrings")
def test_docstring_signature_parsing(self):
self.assertEqual(_testcapi.no_docstring.__doc__, None)
self.assertEqual(_testcapi.no_docstring.__text_signature__, None)
self.assertEqual(_testcapi.docstring_empty.__doc__, None)
self.assertEqual(_testcapi.docstring_empty.__text_signature__, None)
self.assertEqual(_testcapi.docstring_no_signature.__doc__,
"This docstring has no signature.")
self.assertEqual(_testcapi.docstring_no_signature.__text_signature__, None)
self.assertEqual(_testcapi.docstring_with_invalid_signature.__doc__,
"docstring_with_invalid_signature($module, /, boo)\n"
"\n"
"This docstring has an invalid signature."
)
self.assertEqual(_testcapi.docstring_with_invalid_signature.__text_signature__, None)
self.assertEqual(_testcapi.docstring_with_invalid_signature2.__doc__,
"docstring_with_invalid_signature2($module, /, boo)\n"
"\n"
"--\n"
"\n"
"This docstring also has an invalid signature."
)
self.assertEqual(_testcapi.docstring_with_invalid_signature2.__text_signature__, None)
self.assertEqual(_testcapi.docstring_with_signature.__doc__,
"This docstring has a valid signature.")
self.assertEqual(_testcapi.docstring_with_signature.__text_signature__, "($module, /, sig)")
self.assertEqual(_testcapi.docstring_with_signature_but_no_doc.__doc__, None)
self.assertEqual(_testcapi.docstring_with_signature_but_no_doc.__text_signature__,
"($module, /, sig)")
self.assertEqual(_testcapi.docstring_with_signature_and_extra_newlines.__doc__,
"\nThis docstring has a valid signature and some extra newlines.")
self.assertEqual(_testcapi.docstring_with_signature_and_extra_newlines.__text_signature__,
"($module, /, parameter)")
def test_c_type_with_matrix_multiplication(self):
M = _testcapi.matmulType
m1 = M()
m2 = M()
self.assertEqual(m1 @ m2, ("matmul", m1, m2))
self.assertEqual(m1 @ 42, ("matmul", m1, 42))
self.assertEqual(42 @ m1, ("matmul", 42, m1))
o = m1
o @= m2
self.assertEqual(o, ("imatmul", m1, m2))
o = m1
o @= 42
self.assertEqual(o, ("imatmul", m1, 42))
o = 42
o @= m1
self.assertEqual(o, ("matmul", 42, m1))
def test_c_type_with_ipow(self):
# When the __ipow__ method of a type was implemented in C, using the
# modulo param would cause segfaults.
o = _testcapi.ipowType()
self.assertEqual(o.__ipow__(1), (1, None))
self.assertEqual(o.__ipow__(2, 2), (2, 2))
def test_return_null_without_error(self):
# Issue #23571: A function must not return NULL without setting an
# error
if support.Py_DEBUG:
code = textwrap.dedent("""
import _testcapi
from test import support
with support.SuppressCrashReport():
_testcapi.return_null_without_error()
""")
rc, out, err = assert_python_failure('-c', code)
err = decode_stderr(err)
self.assertRegex(err,
r'Fatal Python error: _Py_CheckFunctionResult: '
r'a function returned NULL without setting an exception\n'
r'Python runtime state: initialized\n'
r'SystemError: <built-in function return_null_without_error> '
r'returned NULL without setting an exception\n'
r'\n'
r'Current thread.*:\n'
r' File .*", line 6 in <module>\n')
else:
with self.assertRaises(SystemError) as cm:
_testcapi.return_null_without_error()
self.assertRegex(str(cm.exception),
'return_null_without_error.* '
'returned NULL without setting an exception')
def test_return_result_with_error(self):
# Issue #23571: A function must not return a result with an error set
if support.Py_DEBUG:
code = textwrap.dedent("""
import _testcapi
from test import support
with support.SuppressCrashReport():
_testcapi.return_result_with_error()
""")
rc, out, err = assert_python_failure('-c', code)
err = decode_stderr(err)
self.assertRegex(err,
r'Fatal Python error: _Py_CheckFunctionResult: '
r'a function returned a result with an exception set\n'
r'Python runtime state: initialized\n'
r'ValueError\n'
r'\n'
r'The above exception was the direct cause '
r'of the following exception:\n'
r'\n'
r'SystemError: <built-in '
r'function return_result_with_error> '
r'returned a result with an exception set\n'
r'\n'
r'Current thread.*:\n'
r' File .*, line 6 in <module>\n')
else:
with self.assertRaises(SystemError) as cm:
_testcapi.return_result_with_error()
self.assertRegex(str(cm.exception),
'return_result_with_error.* '
'returned a result with an exception set')
def test_getitem_with_error(self):
# Test _Py_CheckSlotResult(). Raise an exception and then calls
# PyObject_GetItem(): check that the assertion catches the bug.
# PyObject_GetItem() must not be called with an exception set.
code = textwrap.dedent("""
import _testcapi
from test import support
with support.SuppressCrashReport():
_testcapi.getitem_with_error({1: 2}, 1)
""")
rc, out, err = assert_python_failure('-c', code)
err = decode_stderr(err)
if 'SystemError: ' not in err:
self.assertRegex(err,
r'Fatal Python error: _Py_CheckSlotResult: '
r'Slot __getitem__ of type dict succeeded '
r'with an exception set\n'
r'Python runtime state: initialized\n'
r'ValueError: bug\n'
r'\n'
r'Current thread .* \(most recent call first\):\n'
r' File .*, line 6 in <module>\n'
r'\n'
r'Extension modules: _testcapi \(total: 1\)\n')
else:
# Python built with NDEBUG macro defined:
# test _Py_CheckFunctionResult() instead.
self.assertIn('returned a result with an exception set', err)
def test_buildvalue(self):
# Test Py_BuildValue() with object arguments
buildvalue = _testcapi.py_buildvalue
self.assertEqual(buildvalue(''), None)
self.assertEqual(buildvalue('()'), ())
self.assertEqual(buildvalue('[]'), [])
self.assertEqual(buildvalue('{}'), {})
self.assertEqual(buildvalue('()[]{}'), ((), [], {}))
self.assertEqual(buildvalue('O', 1), 1)
self.assertEqual(buildvalue('(O)', 1), (1,))
self.assertEqual(buildvalue('[O]', 1), [1])
self.assertRaises(SystemError, buildvalue, '{O}', 1)
self.assertEqual(buildvalue('OO', 1, 2), (1, 2))
self.assertEqual(buildvalue('(OO)', 1, 2), (1, 2))
self.assertEqual(buildvalue('[OO]', 1, 2), [1, 2])
self.assertEqual(buildvalue('{OO}', 1, 2), {1: 2})
self.assertEqual(buildvalue('{OOOO}', 1, 2, 3, 4), {1: 2, 3: 4})
self.assertEqual(buildvalue('((O))', 1), ((1,),))
self.assertEqual(buildvalue('((OO))', 1, 2), ((1, 2),))
self.assertEqual(buildvalue(' \t,:'), None)
self.assertEqual(buildvalue('O,', 1), 1)
self.assertEqual(buildvalue(' O ', 1), 1)
self.assertEqual(buildvalue('\tO\t', 1), 1)
self.assertEqual(buildvalue('O,O', 1, 2), (1, 2))
self.assertEqual(buildvalue('O, O', 1, 2), (1, 2))
self.assertEqual(buildvalue('O,\tO', 1, 2), (1, 2))
self.assertEqual(buildvalue('O O', 1, 2), (1, 2))
self.assertEqual(buildvalue('O\tO', 1, 2), (1, 2))
self.assertEqual(buildvalue('(O,O)', 1, 2), (1, 2))
self.assertEqual(buildvalue('(O, O,)', 1, 2), (1, 2))
self.assertEqual(buildvalue(' ( O O ) ', 1, 2), (1, 2))
self.assertEqual(buildvalue('\t(\tO\tO\t)\t', 1, 2), (1, 2))
self.assertEqual(buildvalue('[O,O]', 1, 2), [1, 2])
self.assertEqual(buildvalue('[O, O,]', 1, 2), [1, 2])
self.assertEqual(buildvalue(' [ O O ] ', 1, 2), [1, 2])
self.assertEqual(buildvalue(' [\tO\tO\t] ', 1, 2), [1, 2])
self.assertEqual(buildvalue('{O:O}', 1, 2), {1: 2})
self.assertEqual(buildvalue('{O:O,O:O}', 1, 2, 3, 4), {1: 2, 3: 4})
self.assertEqual(buildvalue('{O: O, O: O,}', 1, 2, 3, 4), {1: 2, 3: 4})
self.assertEqual(buildvalue(' { O O O O } ', 1, 2, 3, 4), {1: 2, 3: 4})
self.assertEqual(buildvalue('\t{\tO\tO\tO\tO\t}\t', 1, 2, 3, 4), {1: 2, 3: 4})
self.assertRaises(SystemError, buildvalue, 'O', NULL)
self.assertRaises(SystemError, buildvalue, '(O)', NULL)
self.assertRaises(SystemError, buildvalue, '[O]', NULL)
self.assertRaises(SystemError, buildvalue, '{O}', NULL)
self.assertRaises(SystemError, buildvalue, 'OO', 1, NULL)
self.assertRaises(SystemError, buildvalue, 'OO', NULL, 2)
self.assertRaises(SystemError, buildvalue, '(OO)', 1, NULL)
self.assertRaises(SystemError, buildvalue, '(OO)', NULL, 2)
self.assertRaises(SystemError, buildvalue, '[OO]', 1, NULL)
self.assertRaises(SystemError, buildvalue, '[OO]', NULL, 2)
self.assertRaises(SystemError, buildvalue, '{OO}', 1, NULL)
self.assertRaises(SystemError, buildvalue, '{OO}', NULL, 2)
def test_buildvalue_ints(self):
# Test Py_BuildValue() with integer arguments
buildvalue = _testcapi.py_buildvalue_ints
from _testcapi import SHRT_MIN, SHRT_MAX, USHRT_MAX, INT_MIN, INT_MAX, UINT_MAX
self.assertEqual(buildvalue('i', INT_MAX), INT_MAX)
self.assertEqual(buildvalue('i', INT_MIN), INT_MIN)
self.assertEqual(buildvalue('I', UINT_MAX), UINT_MAX)
self.assertEqual(buildvalue('h', SHRT_MAX), SHRT_MAX)
self.assertEqual(buildvalue('h', SHRT_MIN), SHRT_MIN)
self.assertEqual(buildvalue('H', USHRT_MAX), USHRT_MAX)
self.assertEqual(buildvalue('b', 127), 127)
self.assertEqual(buildvalue('b', -128), -128)
self.assertEqual(buildvalue('B', 255), 255)
self.assertEqual(buildvalue('c', ord('A')), b'A')
self.assertEqual(buildvalue('c', 255), b'\xff')
self.assertEqual(buildvalue('c', 256), b'\x00')
self.assertEqual(buildvalue('c', -1), b'\xff')
self.assertEqual(buildvalue('C', 255), chr(255))
self.assertEqual(buildvalue('C', 256), chr(256))
self.assertEqual(buildvalue('C', sys.maxunicode), chr(sys.maxunicode))
self.assertRaises(ValueError, buildvalue, 'C', -1)
self.assertRaises(ValueError, buildvalue, 'C', sys.maxunicode+1)
# gh-84489
self.assertRaises(ValueError, buildvalue, '(C )i', -1, 2)
self.assertRaises(ValueError, buildvalue, '[C ]i', -1, 2)
self.assertRaises(ValueError, buildvalue, '{Ci }i', -1, 2, 3)
def test_buildvalue_N(self):
_testcapi.test_buildvalue_N()
def check_negative_refcount(self, code):
# bpo-35059: Check that Py_DECREF() reports the correct filename
# when calling _Py_NegativeRefcount() to abort Python.
code = textwrap.dedent(code)
rc, out, err = assert_python_failure('-c', code)
self.assertRegex(err,
br'_testcapimodule\.c:[0-9]+: '
br'_Py_NegativeRefcount: Assertion failed: '
br'object has negative ref count')
@unittest.skipUnless(hasattr(_testcapi, 'negative_refcount'),
'need _testcapi.negative_refcount()')
def test_negative_refcount(self):
code = """
import _testcapi
from test import support
with support.SuppressCrashReport():
_testcapi.negative_refcount()
"""
self.check_negative_refcount(code)
@unittest.skipUnless(hasattr(_testcapi, 'decref_freed_object'),
'need _testcapi.decref_freed_object()')
@support.skip_if_sanitizer("use after free on purpose",
address=True, memory=True, ub=True)
def test_decref_freed_object(self):
code = """
import _testcapi
from test import support
with support.SuppressCrashReport():
_testcapi.decref_freed_object()
"""
self.check_negative_refcount(code)
def test_trashcan_subclass(self):
# bpo-35983: Check that the trashcan mechanism for "list" is NOT
# activated when its tp_dealloc is being called by a subclass
from _testcapi import MyList
L = None
for i in range(1000):
L = MyList((L,))
@support.requires_resource('cpu')
def test_trashcan_python_class1(self):
self.do_test_trashcan_python_class(list)
@support.requires_resource('cpu')
def test_trashcan_python_class2(self):
from _testcapi import MyList
self.do_test_trashcan_python_class(MyList)
def do_test_trashcan_python_class(self, base):
# Check that the trashcan mechanism works properly for a Python
# subclass of a class using the trashcan (this specific test assumes
# that the base class "base" behaves like list)
class PyList(base):
# Count the number of PyList instances to verify that there is
# no memory leak
num = 0
def __init__(self, *args):
__class__.num += 1
super().__init__(*args)
def __del__(self):
__class__.num -= 1
for parity in (0, 1):
L = None
# We need in the order of 2**20 iterations here such that a
# typical 8MB stack would overflow without the trashcan.
for i in range(2**20):
L = PyList((L,))
L.attr = i
if parity:
# Add one additional nesting layer
L = (L,)
self.assertGreater(PyList.num, 0)
del L
self.assertEqual(PyList.num, 0)
def test_heap_ctype_doc_and_text_signature(self):
self.assertEqual(_testcapi.HeapDocCType.__doc__, "somedoc")
self.assertEqual(_testcapi.HeapDocCType.__text_signature__, "(arg1, arg2)")
def test_null_type_doc(self):
self.assertEqual(_testcapi.NullTpDocType.__doc__, None)
def test_subclass_of_heap_gc_ctype_with_tpdealloc_decrefs_once(self):
class HeapGcCTypeSubclass(_testcapi.HeapGcCType):
def __init__(self):
self.value2 = 20
super().__init__()
subclass_instance = HeapGcCTypeSubclass()
type_refcnt = sys.getrefcount(HeapGcCTypeSubclass)
# Test that subclass instance was fully created
self.assertEqual(subclass_instance.value, 10)
self.assertEqual(subclass_instance.value2, 20)
# Test that the type reference count is only decremented once
del subclass_instance
self.assertEqual(type_refcnt - 1, sys.getrefcount(HeapGcCTypeSubclass))
def test_subclass_of_heap_gc_ctype_with_del_modifying_dunder_class_only_decrefs_once(self):
class A(_testcapi.HeapGcCType):
def __init__(self):
self.value2 = 20
super().__init__()
class B(A):
def __init__(self):
super().__init__()
def __del__(self):
self.__class__ = A
A.refcnt_in_del = sys.getrefcount(A)
B.refcnt_in_del = sys.getrefcount(B)
subclass_instance = B()
type_refcnt = sys.getrefcount(B)
new_type_refcnt = sys.getrefcount(A)
# Test that subclass instance was fully created
self.assertEqual(subclass_instance.value, 10)
self.assertEqual(subclass_instance.value2, 20)
del subclass_instance
# Test that setting __class__ modified the reference counts of the types
if support.Py_DEBUG:
# gh-89373: In debug mode, _Py_Dealloc() keeps a strong reference
# to the type while calling tp_dealloc()
self.assertEqual(type_refcnt, B.refcnt_in_del)
else:
self.assertEqual(type_refcnt - 1, B.refcnt_in_del)
self.assertEqual(new_type_refcnt + 1, A.refcnt_in_del)
# Test that the original type already has decreased its refcnt
self.assertEqual(type_refcnt - 1, sys.getrefcount(B))
# Test that subtype_dealloc decref the newly assigned __class__ only once
self.assertEqual(new_type_refcnt, sys.getrefcount(A))
def test_heaptype_with_dict(self):
inst = _testcapi.HeapCTypeWithDict()
inst.foo = 42
self.assertEqual(inst.foo, 42)
self.assertEqual(inst.dictobj, inst.__dict__)
self.assertEqual(inst.dictobj, {"foo": 42})
inst = _testcapi.HeapCTypeWithDict()
self.assertEqual({}, inst.__dict__)
def test_heaptype_with_managed_dict(self):
inst = _testcapi.HeapCTypeWithManagedDict()
inst.foo = 42
self.assertEqual(inst.foo, 42)
self.assertEqual(inst.__dict__, {"foo": 42})
inst = _testcapi.HeapCTypeWithManagedDict()
self.assertEqual({}, inst.__dict__)
a = _testcapi.HeapCTypeWithManagedDict()
b = _testcapi.HeapCTypeWithManagedDict()
a.b = b
b.a = a
del a, b
def test_sublclassing_managed_dict(self):
class C(_testcapi.HeapCTypeWithManagedDict):
pass
i = C()
i.spam = i
del i
def test_heaptype_with_negative_dict(self):
inst = _testcapi.HeapCTypeWithNegativeDict()
inst.foo = 42
self.assertEqual(inst.foo, 42)
self.assertEqual(inst.dictobj, inst.__dict__)
self.assertEqual(inst.dictobj, {"foo": 42})
inst = _testcapi.HeapCTypeWithNegativeDict()
self.assertEqual({}, inst.__dict__)
def test_heaptype_with_weakref(self):
inst = _testcapi.HeapCTypeWithWeakref()
ref = weakref.ref(inst)
self.assertEqual(ref(), inst)
self.assertEqual(inst.weakreflist, ref)
def test_heaptype_with_managed_weakref(self):
inst = _testcapi.HeapCTypeWithManagedWeakref()
ref = weakref.ref(inst)
self.assertEqual(ref(), inst)
def test_sublclassing_managed_weakref(self):
class C(_testcapi.HeapCTypeWithManagedWeakref):
pass
inst = C()
ref = weakref.ref(inst)
self.assertEqual(ref(), inst)
def test_sublclassing_managed_both(self):
class C1(_testcapi.HeapCTypeWithManagedWeakref, _testcapi.HeapCTypeWithManagedDict):
pass
class C2(_testcapi.HeapCTypeWithManagedDict, _testcapi.HeapCTypeWithManagedWeakref):
pass
for cls in (C1, C2):
inst = cls()
ref = weakref.ref(inst)
self.assertEqual(ref(), inst)
inst.spam = inst
del inst
ref = weakref.ref(cls())
self.assertIs(ref(), None)
def test_heaptype_with_buffer(self):
inst = _testcapi.HeapCTypeWithBuffer()
b = bytes(inst)
self.assertEqual(b, b"1234")
def test_c_subclass_of_heap_ctype_with_tpdealloc_decrefs_once(self):
subclass_instance = _testcapi.HeapCTypeSubclass()
type_refcnt = sys.getrefcount(_testcapi.HeapCTypeSubclass)
# Test that subclass instance was fully created
self.assertEqual(subclass_instance.value, 10)
self.assertEqual(subclass_instance.value2, 20)
# Test that the type reference count is only decremented once
del subclass_instance
self.assertEqual(type_refcnt - 1, sys.getrefcount(_testcapi.HeapCTypeSubclass))
def test_c_subclass_of_heap_ctype_with_del_modifying_dunder_class_only_decrefs_once(self):
subclass_instance = _testcapi.HeapCTypeSubclassWithFinalizer()
type_refcnt = sys.getrefcount(_testcapi.HeapCTypeSubclassWithFinalizer)
new_type_refcnt = sys.getrefcount(_testcapi.HeapCTypeSubclass)
# Test that subclass instance was fully created
self.assertEqual(subclass_instance.value, 10)
self.assertEqual(subclass_instance.value2, 20)
# The tp_finalize slot will set __class__ to HeapCTypeSubclass
del subclass_instance
# Test that setting __class__ modified the reference counts of the types
if support.Py_DEBUG:
# gh-89373: In debug mode, _Py_Dealloc() keeps a strong reference
# to the type while calling tp_dealloc()
self.assertEqual(type_refcnt, _testcapi.HeapCTypeSubclassWithFinalizer.refcnt_in_del)
else:
self.assertEqual(type_refcnt - 1, _testcapi.HeapCTypeSubclassWithFinalizer.refcnt_in_del)
self.assertEqual(new_type_refcnt + 1, _testcapi.HeapCTypeSubclass.refcnt_in_del)
# Test that the original type already has decreased its refcnt
self.assertEqual(type_refcnt - 1, sys.getrefcount(_testcapi.HeapCTypeSubclassWithFinalizer))
# Test that subtype_dealloc decref the newly assigned __class__ only once
self.assertEqual(new_type_refcnt, sys.getrefcount(_testcapi.HeapCTypeSubclass))
def test_heaptype_with_setattro(self):
obj = _testcapi.HeapCTypeSetattr()
self.assertEqual(obj.pvalue, 10)
obj.value = 12
self.assertEqual(obj.pvalue, 12)
del obj.value
self.assertEqual(obj.pvalue, 0)
def test_heaptype_with_custom_metaclass(self):
metaclass = _testcapi.HeapCTypeMetaclass
self.assertTrue(issubclass(metaclass, type))
# Class creation from C
t = _testcapi.pytype_fromspec_meta(metaclass)
self.assertIsInstance(t, type)
self.assertEqual(t.__name__, "HeapCTypeViaMetaclass")
self.assertIs(type(t), metaclass)
# Class creation from Python
t = metaclass("PyClassViaMetaclass", (), {})
self.assertIsInstance(t, type)
self.assertEqual(t.__name__, "PyClassViaMetaclass")
def test_heaptype_with_custom_metaclass_null_new(self):
metaclass = _testcapi.HeapCTypeMetaclassNullNew
self.assertTrue(issubclass(metaclass, type))
# Class creation from C
t = _testcapi.pytype_fromspec_meta(metaclass)
self.assertIsInstance(t, type)
self.assertEqual(t.__name__, "HeapCTypeViaMetaclass")
self.assertIs(type(t), metaclass)
# Class creation from Python
with self.assertRaisesRegex(TypeError, "cannot create .* instances"):
metaclass("PyClassViaMetaclass", (), {})
def test_heaptype_with_custom_metaclass_custom_new(self):
metaclass = _testcapi.HeapCTypeMetaclassCustomNew
self.assertTrue(issubclass(_testcapi.HeapCTypeMetaclassCustomNew, type))
msg = "Metaclasses with custom tp_new are not supported."
with self.assertRaisesRegex(TypeError, msg):
t = _testcapi.pytype_fromspec_meta(metaclass)
def test_heaptype_with_custom_metaclass_deprecation(self):
metaclass = _testcapi.HeapCTypeMetaclassCustomNew
# gh-103968: a metaclass with custom tp_new is deprecated, but still
# allowed for functions that existed in 3.11
# (PyType_FromSpecWithBases is used here).
class Base(metaclass=metaclass):
pass
# Class creation from C
with warnings_helper.check_warnings(
('.* _testcapi.Subclass .* custom tp_new.*in Python 3.14.*', DeprecationWarning),
):
sub = _testcapi.make_type_with_base(Base)
self.assertTrue(issubclass(sub, Base))
self.assertIsInstance(sub, metaclass)
def test_multiple_inheritance_ctypes_with_weakref_or_dict(self):
with self.assertRaises(TypeError):
class Both1(_testcapi.HeapCTypeWithWeakref, _testcapi.HeapCTypeWithDict):
pass
with self.assertRaises(TypeError):
class Both2(_testcapi.HeapCTypeWithDict, _testcapi.HeapCTypeWithWeakref):
pass
def test_multiple_inheritance_ctypes_with_weakref_or_dict_and_other_builtin(self):
with self.assertRaises(TypeError):
class C1(_testcapi.HeapCTypeWithDict, list):
pass
with self.assertRaises(TypeError):
class C2(_testcapi.HeapCTypeWithWeakref, list):
pass
class C3(_testcapi.HeapCTypeWithManagedDict, list):
pass
class C4(_testcapi.HeapCTypeWithManagedWeakref, list):
pass
inst = C3()
inst.append(0)
str(inst.__dict__)
inst = C4()
inst.append(0)
str(inst.__weakref__)
for cls in (_testcapi.HeapCTypeWithManagedDict, _testcapi.HeapCTypeWithManagedWeakref):
for cls2 in (_testcapi.HeapCTypeWithDict, _testcapi.HeapCTypeWithWeakref):
class S(cls, cls2):
pass
class B1(C3, cls):
pass
class B2(C4, cls):
pass
def test_pytype_fromspec_with_repeated_slots(self):
for variant in range(2):
with self.subTest(variant=variant):
with self.assertRaises(SystemError):
_testcapi.create_type_from_repeated_slots(variant)
@warnings_helper.ignore_warnings(category=DeprecationWarning)
def test_immutable_type_with_mutable_base(self):
# Add deprecation warning here so it's removed in 3.14
warnings._deprecated(
'creating immutable classes with mutable bases', remove=(3, 14))
class MutableBase:
def meth(self):
return 'original'
with self.assertWarns(DeprecationWarning):
ImmutableSubclass = _testcapi.make_immutable_type_with_base(
MutableBase)
instance = ImmutableSubclass()
self.assertEqual(instance.meth(), 'original')
# Cannot override the static type's method
with self.assertRaisesRegex(
TypeError,
"cannot set 'meth' attribute of immutable type"):
ImmutableSubclass.meth = lambda self: 'overridden'
self.assertEqual(instance.meth(), 'original')
# Can change the method on the mutable base
MutableBase.meth = lambda self: 'changed'
self.assertEqual(instance.meth(), 'changed')
def test_pynumber_tobase(self):
from _testcapi import pynumber_tobase
small_number = 123
large_number = 2**64
class IDX:
def __init__(self, val):
self.val = val
def __index__(self):
return self.val
test_cases = ((2, '0b1111011', '0b10000000000000000000000000000000000000000000000000000000000000000'),
(8, '0o173', '0o2000000000000000000000'),
(10, '123', '18446744073709551616'),
(16, '0x7b', '0x10000000000000000'))
for base, small_target, large_target in test_cases:
with self.subTest(base=base, st=small_target, lt=large_target):
# Test for small number
self.assertEqual(pynumber_tobase(small_number, base), small_target)
self.assertEqual(pynumber_tobase(-small_number, base), '-' + small_target)
self.assertEqual(pynumber_tobase(IDX(small_number), base), small_target)
# Test for large number(out of range of a longlong,i.e.[-2**63, 2**63-1])
self.assertEqual(pynumber_tobase(large_number, base), large_target)
self.assertEqual(pynumber_tobase(-large_number, base), '-' + large_target)
self.assertEqual(pynumber_tobase(IDX(large_number), base), large_target)
self.assertRaises(TypeError, pynumber_tobase, IDX(123.0), 10)
self.assertRaises(TypeError, pynumber_tobase, IDX('123'), 10)
self.assertRaises(TypeError, pynumber_tobase, 123.0, 10)
self.assertRaises(TypeError, pynumber_tobase, '123', 10)
self.assertRaises(SystemError, pynumber_tobase, 123, 0)
def test_pyobject_repr_from_null(self):
s = _testcapi.pyobject_repr_from_null()
self.assertEqual(s, '<NULL>')
def test_pyobject_str_from_null(self):
s = _testcapi.pyobject_str_from_null()
self.assertEqual(s, '<NULL>')
def test_pyobject_bytes_from_null(self):
s = _testcapi.pyobject_bytes_from_null()
self.assertEqual(s, b'<NULL>')
def test_Py_CompileString(self):
# Check that Py_CompileString respects the coding cookie
_compile = _testcapi.Py_CompileString
code = b"# -*- coding: latin1 -*-\nprint('\xc2\xa4')\n"
result = _compile(code)
expected = compile(code, "<string>", "exec")
self.assertEqual(result.co_consts, expected.co_consts)
def test_export_symbols(self):
# bpo-44133: Ensure that the "Py_FrozenMain" and
# "PyThread_get_thread_native_id" symbols are exported by the Python
# (directly by the binary, or via by the Python dynamic library).
ctypes = import_helper.import_module('ctypes')
names = []
# Test if the PY_HAVE_THREAD_NATIVE_ID macro is defined
if hasattr(_thread, 'get_native_id'):
names.append('PyThread_get_thread_native_id')
# Python/frozenmain.c fails to build on Windows when the symbols are
# missing:
# - PyWinFreeze_ExeInit
# - PyWinFreeze_ExeTerm
# - PyInitFrozenExtensions
if os.name != 'nt':
names.append('Py_FrozenMain')
for name in names:
with self.subTest(name=name):
self.assertTrue(hasattr(ctypes.pythonapi, name))
def test_clear_managed_dict(self):
class C:
def __init__(self):
self.a = 1
c = C()
_testcapi.clear_managed_dict(c)
self.assertEqual(c.__dict__, {})
c = C()
self.assertEqual(c.__dict__, {'a':1})
_testcapi.clear_managed_dict(c)
self.assertEqual(c.__dict__, {})
def test_eval_get_func_name(self):
def function_example(): ...
class A:
def method_example(self): ...
self.assertEqual(_testcapi.eval_get_func_name(function_example),
"function_example")
self.assertEqual(_testcapi.eval_get_func_name(A.method_example),
"method_example")
self.assertEqual(_testcapi.eval_get_func_name(A().method_example),
"method_example")
self.assertEqual(_testcapi.eval_get_func_name(sum), "sum") # c function
self.assertEqual(_testcapi.eval_get_func_name(A), "type")
def test_eval_get_func_desc(self):
def function_example(): ...
class A:
def method_example(self): ...
self.assertEqual(_testcapi.eval_get_func_desc(function_example),
"()")
self.assertEqual(_testcapi.eval_get_func_desc(A.method_example),
"()")
self.assertEqual(_testcapi.eval_get_func_desc(A().method_example),
"()")
self.assertEqual(_testcapi.eval_get_func_desc(sum), "()") # c function
self.assertEqual(_testcapi.eval_get_func_desc(A), " object")
def test_function_get_code(self):
import types
def some():
pass
code = _testcapi.function_get_code(some)
self.assertIsInstance(code, types.CodeType)
self.assertEqual(code, some.__code__)
with self.assertRaises(SystemError):
_testcapi.function_get_code(None) # not a function
def test_function_get_globals(self):
def some():
pass
globals_ = _testcapi.function_get_globals(some)
self.assertIsInstance(globals_, dict)
self.assertEqual(globals_, some.__globals__)
with self.assertRaises(SystemError):
_testcapi.function_get_globals(None) # not a function
def test_function_get_module(self):
def some():
pass
module = _testcapi.function_get_module(some)
self.assertIsInstance(module, str)
self.assertEqual(module, some.__module__)
with self.assertRaises(SystemError):
_testcapi.function_get_module(None) # not a function
def test_function_get_defaults(self):
def some(
pos_only1, pos_only2='p',
/,
zero=0, optional=None,
*,
kw1,
kw2=True,
):
pass
defaults = _testcapi.function_get_defaults(some)
self.assertEqual(defaults, ('p', 0, None))
self.assertEqual(defaults, some.__defaults__)
with self.assertRaises(SystemError):
_testcapi.function_get_defaults(None) # not a function
def test_function_set_defaults(self):
def some(
pos_only1, pos_only2='p',
/,
zero=0, optional=None,
*,
kw1,
kw2=True,
):
pass
old_defaults = ('p', 0, None)
self.assertEqual(_testcapi.function_get_defaults(some), old_defaults)
self.assertEqual(some.__defaults__, old_defaults)
with self.assertRaises(SystemError):
_testcapi.function_set_defaults(some, 1) # not tuple or None
self.assertEqual(_testcapi.function_get_defaults(some), old_defaults)
self.assertEqual(some.__defaults__, old_defaults)
with self.assertRaises(SystemError):
_testcapi.function_set_defaults(1, ()) # not a function
self.assertEqual(_testcapi.function_get_defaults(some), old_defaults)
self.assertEqual(some.__defaults__, old_defaults)
new_defaults = ('q', 1, None)
_testcapi.function_set_defaults(some, new_defaults)
self.assertEqual(_testcapi.function_get_defaults(some), new_defaults)
self.assertEqual(some.__defaults__, new_defaults)
# Empty tuple is fine:
new_defaults = ()
_testcapi.function_set_defaults(some, new_defaults)
self.assertEqual(_testcapi.function_get_defaults(some), new_defaults)
self.assertEqual(some.__defaults__, new_defaults)
class tuplesub(tuple): ... # tuple subclasses must work
new_defaults = tuplesub(((1, 2), ['a', 'b'], None))
_testcapi.function_set_defaults(some, new_defaults)
self.assertEqual(_testcapi.function_get_defaults(some), new_defaults)
self.assertEqual(some.__defaults__, new_defaults)
# `None` is special, it sets `defaults` to `NULL`,
# it needs special handling in `_testcapi`:
_testcapi.function_set_defaults(some, None)
self.assertEqual(_testcapi.function_get_defaults(some), None)
self.assertEqual(some.__defaults__, None)
def test_function_get_kw_defaults(self):
def some(
pos_only1, pos_only2='p',
/,
zero=0, optional=None,
*,
kw1,
kw2=True,
):
pass
defaults = _testcapi.function_get_kw_defaults(some)
self.assertEqual(defaults, {'kw2': True})
self.assertEqual(defaults, some.__kwdefaults__)
with self.assertRaises(SystemError):
_testcapi.function_get_kw_defaults(None) # not a function
def test_function_set_kw_defaults(self):
def some(
pos_only1, pos_only2='p',
/,
zero=0, optional=None,
*,
kw1,
kw2=True,
):
pass
old_defaults = {'kw2': True}
self.assertEqual(_testcapi.function_get_kw_defaults(some), old_defaults)
self.assertEqual(some.__kwdefaults__, old_defaults)
with self.assertRaises(SystemError):
_testcapi.function_set_kw_defaults(some, 1) # not dict or None
self.assertEqual(_testcapi.function_get_kw_defaults(some), old_defaults)
self.assertEqual(some.__kwdefaults__, old_defaults)
with self.assertRaises(SystemError):
_testcapi.function_set_kw_defaults(1, {}) # not a function
self.assertEqual(_testcapi.function_get_kw_defaults(some), old_defaults)
self.assertEqual(some.__kwdefaults__, old_defaults)
new_defaults = {'kw2': (1, 2, 3)}
_testcapi.function_set_kw_defaults(some, new_defaults)
self.assertEqual(_testcapi.function_get_kw_defaults(some), new_defaults)
self.assertEqual(some.__kwdefaults__, new_defaults)
# Empty dict is fine:
new_defaults = {}
_testcapi.function_set_kw_defaults(some, new_defaults)
self.assertEqual(_testcapi.function_get_kw_defaults(some), new_defaults)
self.assertEqual(some.__kwdefaults__, new_defaults)
class dictsub(dict): ... # dict subclasses must work
new_defaults = dictsub({'kw2': None})
_testcapi.function_set_kw_defaults(some, new_defaults)
self.assertEqual(_testcapi.function_get_kw_defaults(some), new_defaults)
self.assertEqual(some.__kwdefaults__, new_defaults)
# `None` is special, it sets `kwdefaults` to `NULL`,
# it needs special handling in `_testcapi`:
_testcapi.function_set_kw_defaults(some, None)
self.assertEqual(_testcapi.function_get_kw_defaults(some), None)
self.assertEqual(some.__kwdefaults__, None)
def test_unstable_gc_new_with_extra_data(self):
class Data(_testcapi.ObjExtraData):
__slots__ = ('x', 'y')
d = Data()
d.x = 10
d.y = 20
d.extra = 30
self.assertEqual(d.x, 10)
self.assertEqual(d.y, 20)
self.assertEqual(d.extra, 30)
del d.extra
self.assertIsNone(d.extra)
@requires_limited_api
class TestHeapTypeRelative(unittest.TestCase):
"""Test API for extending opaque types (PEP 697)"""
@requires_limited_api
def test_heaptype_relative_sizes(self):
# Test subclassing using "relative" basicsize, see PEP 697
def check(extra_base_size, extra_size):
Base, Sub, instance, data_ptr, data_offset, data_size = (
_testcapi.make_sized_heaptypes(
extra_base_size, -extra_size))
# no alignment shenanigans when inheriting directly
if extra_size == 0:
self.assertEqual(Base.__basicsize__, Sub.__basicsize__)
self.assertEqual(data_size, 0)
else:
# The following offsets should be in increasing order:
offsets = [
(0, 'start of object'),
(Base.__basicsize__, 'end of base data'),
(data_offset, 'subclass data'),
(data_offset + extra_size, 'end of requested subcls data'),
(data_offset + data_size, 'end of reserved subcls data'),
(Sub.__basicsize__, 'end of object'),
]
ordered_offsets = sorted(offsets, key=operator.itemgetter(0))
self.assertEqual(
offsets, ordered_offsets,
msg=f'Offsets not in expected order, got: {ordered_offsets}')
# end of reserved subcls data == end of object
self.assertEqual(Sub.__basicsize__, data_offset + data_size)
# we don't reserve (requested + alignment) or more data
self.assertLess(data_size - extra_size,
_testcapi.ALIGNOF_MAX_ALIGN_T)
# The offsets/sizes we calculated should be aligned.
self.assertEqual(data_offset % _testcapi.ALIGNOF_MAX_ALIGN_T, 0)
self.assertEqual(data_size % _testcapi.ALIGNOF_MAX_ALIGN_T, 0)
sizes = sorted({0, 1, 2, 3, 4, 7, 8, 123,
object.__basicsize__,
object.__basicsize__-1,
object.__basicsize__+1})
for extra_base_size in sizes:
for extra_size in sizes:
args = dict(extra_base_size=extra_base_size,
extra_size=extra_size)
with self.subTest(**args):
check(**args)
def test_HeapCCollection(self):
"""Make sure HeapCCollection works properly by itself"""
collection = _testcapi.HeapCCollection(1, 2, 3)
self.assertEqual(list(collection), [1, 2, 3])
def test_heaptype_inherit_itemsize(self):
"""Test HeapCCollection subclasses work properly"""
sizes = sorted({0, 1, 2, 3, 4, 7, 8, 123,
object.__basicsize__,
object.__basicsize__-1,
object.__basicsize__+1})
for extra_size in sizes:
with self.subTest(extra_size=extra_size):
Sub = _testcapi.subclass_var_heaptype(
_testcapi.HeapCCollection, -extra_size, 0, 0)
collection = Sub(1, 2, 3)
collection.set_data_to_3s()
self.assertEqual(list(collection), [1, 2, 3])
mem = collection.get_data()
self.assertGreaterEqual(len(mem), extra_size)
self.assertTrue(set(mem) <= {3}, f'got {mem!r}')
def test_heaptype_invalid_inheritance(self):
with self.assertRaises(SystemError,
msg="Cannot extend variable-size class without "
+ "Py_TPFLAGS_ITEMS_AT_END"):
_testcapi.subclass_heaptype(int, -8, 0)
def test_heaptype_relative_members(self):
"""Test HeapCCollection subclasses work properly"""
sizes = sorted({0, 1, 2, 3, 4, 7, 8, 123,
object.__basicsize__,
object.__basicsize__-1,
object.__basicsize__+1})
for extra_base_size in sizes:
for extra_size in sizes:
for offset in sizes:
with self.subTest(extra_base_size=extra_base_size, extra_size=extra_size, offset=offset):
if offset < extra_size:
Sub = _testcapi.make_heaptype_with_member(
extra_base_size, -extra_size, offset, True)
Base = Sub.mro()[1]
instance = Sub()
self.assertEqual(instance.memb, instance.get_memb())
instance.set_memb(13)
self.assertEqual(instance.memb, instance.get_memb())
self.assertEqual(instance.get_memb(), 13)
instance.memb = 14
self.assertEqual(instance.memb, instance.get_memb())
self.assertEqual(instance.get_memb(), 14)
self.assertGreaterEqual(instance.get_memb_offset(), Base.__basicsize__)
self.assertLess(instance.get_memb_offset(), Sub.__basicsize__)
with self.assertRaises(SystemError):
instance.get_memb_relative()
with self.assertRaises(SystemError):
instance.set_memb_relative(0)
else:
with self.assertRaises(SystemError):
Sub = _testcapi.make_heaptype_with_member(
extra_base_size, -extra_size, offset, True)
with self.assertRaises(SystemError):
Sub = _testcapi.make_heaptype_with_member(
extra_base_size, extra_size, offset, True)
with self.subTest(extra_base_size=extra_base_size, extra_size=extra_size):
with self.assertRaises(SystemError):
Sub = _testcapi.make_heaptype_with_member(
extra_base_size, -extra_size, -1, True)
def test_heaptype_relative_members_errors(self):
with self.assertRaisesRegex(
SystemError,
r"With Py_RELATIVE_OFFSET, basicsize must be negative"):
_testcapi.make_heaptype_with_member(0, 1234, 0, True)
with self.assertRaisesRegex(
SystemError, r"Member offset out of range \(0\.\.-basicsize\)"):
_testcapi.make_heaptype_with_member(0, -8, 1234, True)
with self.assertRaisesRegex(
SystemError, r"Member offset out of range \(0\.\.-basicsize\)"):
_testcapi.make_heaptype_with_member(0, -8, -1, True)
Sub = _testcapi.make_heaptype_with_member(0, -8, 0, True)
instance = Sub()
with self.assertRaisesRegex(
SystemError, r"PyMember_GetOne used with Py_RELATIVE_OFFSET"):
instance.get_memb_relative()
with self.assertRaisesRegex(
SystemError, r"PyMember_SetOne used with Py_RELATIVE_OFFSET"):
instance.set_memb_relative(0)
def test_pyobject_getitemdata_error(self):
"""Test PyObject_GetItemData fails on unsupported types"""
with self.assertRaises(TypeError):
# None is not variable-length
_testcapi.pyobject_getitemdata(None)
with self.assertRaises(TypeError):
# int is variable-length, but doesn't have the
# Py_TPFLAGS_ITEMS_AT_END layout (and flag)
_testcapi.pyobject_getitemdata(0)
class TestPendingCalls(unittest.TestCase):
# See the comment in ceval.c (at the "handle_eval_breaker" label)
# about when pending calls get run. This is especially relevant
# here for creating deterministic tests.
def pendingcalls_submit(self, l, n):
def callback():
#this function can be interrupted by thread switching so let's
#use an atomic operation
l.append(None)
for i in range(n):
time.sleep(random.random()*0.02) #0.01 secs on average
#try submitting callback until successful.
#rely on regular interrupt to flush queue if we are
#unsuccessful.
while True:
if _testcapi._pending_threadfunc(callback):
break
def pendingcalls_wait(self, l, n, context = None):
#now, stick around until l[0] has grown to 10
count = 0
while len(l) != n:
#this busy loop is where we expect to be interrupted to
#run our callbacks. Note that callbacks are only run on the
#main thread
if False and support.verbose:
print("(%i)"%(len(l),),)
for i in range(1000):
a = i*i
if context and not context.event.is_set():
continue
count += 1
self.assertTrue(count < 10000,
"timeout waiting for %i callbacks, got %i"%(n, len(l)))
if False and support.verbose:
print("(%i)"%(len(l),))
@threading_helper.requires_working_threading()
def test_pendingcalls_threaded(self):
#do every callback on a separate thread
n = 32 #total callbacks
threads = []
class foo(object):pass
context = foo()
context.l = []
context.n = 2 #submits per thread
context.nThreads = n // context.n
context.nFinished = 0
context.lock = threading.Lock()
context.event = threading.Event()
threads = [threading.Thread(target=self.pendingcalls_thread,
args=(context,))
for i in range(context.nThreads)]
with threading_helper.start_threads(threads):
self.pendingcalls_wait(context.l, n, context)
def pendingcalls_thread(self, context):
try:
self.pendingcalls_submit(context.l, context.n)
finally:
with context.lock:
context.nFinished += 1
nFinished = context.nFinished
if False and support.verbose:
print("finished threads: ", nFinished)
if nFinished == context.nThreads:
context.event.set()
def test_pendingcalls_non_threaded(self):
#again, just using the main thread, likely they will all be dispatched at
#once. It is ok to ask for too many, because we loop until we find a slot.
#the loop can be interrupted to dispatch.
#there are only 32 dispatch slots, so we go for twice that!
l = []
n = 64
self.pendingcalls_submit(l, n)
self.pendingcalls_wait(l, n)
def test_gen_get_code(self):
def genf(): yield
gen = genf()
self.assertEqual(_testcapi.gen_get_code(gen), gen.gi_code)
class PendingTask(types.SimpleNamespace):
_add_pending = _testinternalcapi.pending_threadfunc
def __init__(self, req, taskid=None, notify_done=None):
self.id = taskid
self.req = req
self.notify_done = notify_done
self.creator_tid = threading.get_ident()
self.requester_tid = None
self.runner_tid = None
self.result = None
def run(self):
assert self.result is None
self.runner_tid = threading.get_ident()
self._run()
if self.notify_done is not None:
self.notify_done()
def _run(self):
self.result = self.req
def run_in_pending_call(self, worker_tids):
assert self._add_pending is _testinternalcapi.pending_threadfunc
self.requester_tid = threading.get_ident()
def callback():
assert self.result is None
# It can be tricky to control which thread handles
# the eval breaker, so we take a naive approach to
# make sure.
if threading.get_ident() not in worker_tids:
self._add_pending(callback, ensure_added=True)
return
self.run()
self._add_pending(callback, ensure_added=True)
def create_thread(self, worker_tids):
return threading.Thread(
target=self.run_in_pending_call,
args=(worker_tids,),
)
def wait_for_result(self):
while self.result is None:
time.sleep(0.01)
@threading_helper.requires_working_threading()
def test_subthreads_can_handle_pending_calls(self):
payload = 'Spam spam spam spam. Lovely spam! Wonderful spam!'
task = self.PendingTask(payload)
def do_the_work():
tid = threading.get_ident()
t = task.create_thread({tid})
with threading_helper.start_threads([t]):
task.wait_for_result()
t = threading.Thread(target=do_the_work)
with threading_helper.start_threads([t]):
pass
self.assertEqual(task.result, payload)
@threading_helper.requires_working_threading()
def test_many_subthreads_can_handle_pending_calls(self):
main_tid = threading.get_ident()
self.assertEqual(threading.main_thread().ident, main_tid)
# We can't use queue.Queue since it isn't reentrant relative
# to pending calls.
_queue = deque()
_active = deque()
_done_lock = threading.Lock()
def queue_put(task):
_queue.append(task)
_active.append(True)
def queue_get():
try:
task = _queue.popleft()
except IndexError:
raise queue.Empty
return task
def queue_task_done():
_active.pop()
if not _active:
try:
_done_lock.release()
except RuntimeError:
assert not _done_lock.locked()
def queue_empty():
return not _queue
def queue_join():
_done_lock.acquire()
_done_lock.release()
tasks = []
for i in range(20):
task = self.PendingTask(
req=f'request {i}',
taskid=i,
notify_done=queue_task_done,
)
tasks.append(task)
queue_put(task)
# This will be released once all the tasks have finished.
_done_lock.acquire()
def add_tasks(worker_tids):
while True:
if done:
return
try:
task = queue_get()
except queue.Empty:
break
task.run_in_pending_call(worker_tids)
done = False
def run_tasks():
while not queue_empty():
if done:
return
time.sleep(0.01)
# Give the worker a chance to handle any remaining pending calls.
while not done:
time.sleep(0.01)
# Start the workers and wait for them to finish.
worker_threads = [threading.Thread(target=run_tasks)
for _ in range(3)]
with threading_helper.start_threads(worker_threads):
try:
# Add a pending call for each task.
worker_tids = [t.ident for t in worker_threads]
threads = [threading.Thread(target=add_tasks, args=(worker_tids,))
for _ in range(3)]
with threading_helper.start_threads(threads):
try:
pass
except BaseException:
done = True
raise # re-raise
# Wait for the pending calls to finish.
queue_join()
# Notify the workers that they can stop.
done = True
except BaseException:
done = True
raise # re-raise
runner_tids = [t.runner_tid for t in tasks]
self.assertNotIn(main_tid, runner_tids)
for task in tasks:
with self.subTest(f'task {task.id}'):
self.assertNotEqual(task.requester_tid, main_tid)
self.assertNotEqual(task.requester_tid, task.runner_tid)
self.assertNotIn(task.requester_tid, runner_tids)
@requires_subinterpreters
def test_isolated_subinterpreter(self):
# We exercise the most important permutations.
# This test relies on pending calls getting called
# (eval breaker tripped) at each loop iteration
# and at each call.
maxtext = 250
main_interpid = 0
interpid = _interpreters.create()
_interpreters.run_string(interpid, f"""if True:
import json
import os
import threading
import time
import _testinternalcapi
from test.support import threading_helper
""")
def create_pipe():
r, w = os.pipe()
self.addCleanup(lambda: os.close(r))
self.addCleanup(lambda: os.close(w))
return r, w
with self.subTest('add in main, run in subinterpreter'):
r_ready, w_ready = create_pipe()
r_done, w_done= create_pipe()
timeout = time.time() + 30 # seconds
def do_work():
_interpreters.run_string(interpid, f"""if True:
# Wait until this interp has handled the pending call.
waiting = False
done = False
def wait(os_read=os.read):
global done, waiting
waiting = True
os_read({r_done}, 1)
done = True
t = threading.Thread(target=wait)
with threading_helper.start_threads([t]):
while not waiting:
pass
os.write({w_ready}, b'\\0')
# Loop to trigger the eval breaker.
while not done:
time.sleep(0.01)
if time.time() > {timeout}:
raise Exception('timed out!')
""")
t = threading.Thread(target=do_work)
with threading_helper.start_threads([t]):
os.read(r_ready, 1)
# Add the pending call and wait for it to finish.
actual = _testinternalcapi.pending_identify(interpid)
# Signal the subinterpreter to stop.
os.write(w_done, b'\0')
self.assertEqual(actual, int(interpid))
with self.subTest('add in main, run in subinterpreter sub-thread'):
r_ready, w_ready = create_pipe()
r_done, w_done= create_pipe()
timeout = time.time() + 30 # seconds
def do_work():
_interpreters.run_string(interpid, f"""if True:
waiting = False
done = False
def subthread():
while not waiting:
pass
os.write({w_ready}, b'\\0')
# Loop to trigger the eval breaker.
while not done:
time.sleep(0.01)
if time.time() > {timeout}:
raise Exception('timed out!')
t = threading.Thread(target=subthread)
with threading_helper.start_threads([t]):
# Wait until this interp has handled the pending call.
waiting = True
os.read({r_done}, 1)
done = True
""")
t = threading.Thread(target=do_work)
with threading_helper.start_threads([t]):
os.read(r_ready, 1)
# Add the pending call and wait for it to finish.
actual = _testinternalcapi.pending_identify(interpid)
# Signal the subinterpreter to stop.
os.write(w_done, b'\0')
self.assertEqual(actual, int(interpid))
with self.subTest('add in subinterpreter, run in main'):
r_ready, w_ready = create_pipe()
r_done, w_done= create_pipe()
r_data, w_data= create_pipe()
timeout = time.time() + 30 # seconds
def add_job():
os.read(r_ready, 1)
_interpreters.run_string(interpid, f"""if True:
# Add the pending call and wait for it to finish.
actual = _testinternalcapi.pending_identify({main_interpid})
# Signal the subinterpreter to stop.
os.write({w_done}, b'\\0')
os.write({w_data}, actual.to_bytes(1, 'little'))
""")
# Wait until this interp has handled the pending call.
waiting = False
done = False
def wait(os_read=os.read):
nonlocal done, waiting
waiting = True
os_read(r_done, 1)
done = True
t1 = threading.Thread(target=add_job)
t2 = threading.Thread(target=wait)
with threading_helper.start_threads([t1, t2]):
while not waiting:
pass
os.write(w_ready, b'\0')
# Loop to trigger the eval breaker.
while not done:
time.sleep(0.01)
if time.time() > timeout:
raise Exception('timed out!')
text = os.read(r_data, 1)
actual = int.from_bytes(text, 'little')
self.assertEqual(actual, int(main_interpid))
with self.subTest('add in subinterpreter, run in sub-thread'):
r_ready, w_ready = create_pipe()
r_done, w_done= create_pipe()
r_data, w_data= create_pipe()
timeout = time.time() + 30 # seconds
def add_job():
os.read(r_ready, 1)
_interpreters.run_string(interpid, f"""if True:
# Add the pending call and wait for it to finish.
actual = _testinternalcapi.pending_identify({main_interpid})
# Signal the subinterpreter to stop.
os.write({w_done}, b'\\0')
os.write({w_data}, actual.to_bytes(1, 'little'))
""")
# Wait until this interp has handled the pending call.
waiting = False
done = False
def wait(os_read=os.read):
nonlocal done, waiting
waiting = True
os_read(r_done, 1)
done = True
def subthread():
while not waiting:
pass
os.write(w_ready, b'\0')
# Loop to trigger the eval breaker.
while not done:
time.sleep(0.01)
if time.time() > timeout:
raise Exception('timed out!')
t1 = threading.Thread(target=add_job)
t2 = threading.Thread(target=wait)
t3 = threading.Thread(target=subthread)
with threading_helper.start_threads([t1, t2, t3]):
pass
text = os.read(r_data, 1)
actual = int.from_bytes(text, 'little')
self.assertEqual(actual, int(main_interpid))
# XXX We can't use the rest until gh-105716 is fixed.
return
with self.subTest('add in subinterpreter, run in subinterpreter sub-thread'):
r_ready, w_ready = create_pipe()
r_done, w_done= create_pipe()
r_data, w_data= create_pipe()
timeout = time.time() + 30 # seconds
def do_work():
_interpreters.run_string(interpid, f"""if True:
waiting = False
done = False
def subthread():
while not waiting:
pass
os.write({w_ready}, b'\\0')
# Loop to trigger the eval breaker.
while not done:
time.sleep(0.01)
if time.time() > {timeout}:
raise Exception('timed out!')
t = threading.Thread(target=subthread)
with threading_helper.start_threads([t]):
# Wait until this interp has handled the pending call.
waiting = True
os.read({r_done}, 1)
done = True
""")
t = threading.Thread(target=do_work)
#with threading_helper.start_threads([t]):
t.start()
if True:
os.read(r_ready, 1)
_interpreters.run_string(interpid, f"""if True:
# Add the pending call and wait for it to finish.
actual = _testinternalcapi.pending_identify({interpid})
# Signal the subinterpreter to stop.
os.write({w_done}, b'\\0')
os.write({w_data}, actual.to_bytes(1, 'little'))
""")
t.join()
text = os.read(r_data, 1)
actual = int.from_bytes(text, 'little')
self.assertEqual(actual, int(interpid))
class SubinterpreterTest(unittest.TestCase):
@unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
def test_subinterps(self):
import builtins
r, w = os.pipe()
code = """if 1:
import sys, builtins, pickle
with open({:d}, "wb") as f:
pickle.dump(id(sys.modules), f)
pickle.dump(id(builtins), f)
""".format(w)
with open(r, "rb") as f:
ret = support.run_in_subinterp(code)
self.assertEqual(ret, 0)
self.assertNotEqual(pickle.load(f), id(sys.modules))
self.assertNotEqual(pickle.load(f), id(builtins))
@unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
def test_subinterps_recent_language_features(self):
r, w = os.pipe()
code = """if 1:
import pickle
with open({:d}, "wb") as f:
@(lambda x:x) # Py 3.9
def noop(x): return x
a = (b := f'1{{2}}3') + noop('x') # Py 3.8 (:=) / 3.6 (f'')
async def foo(arg): return await arg # Py 3.5
pickle.dump(dict(a=a, b=b), f)
""".format(w)
with open(r, "rb") as f:
ret = support.run_in_subinterp(code)
self.assertEqual(ret, 0)
self.assertEqual(pickle.load(f), {'a': '123x', 'b': '123'})
def test_py_config_isoloated_per_interpreter(self):
# A config change in one interpreter must not leak to out to others.
#
# This test could verify ANY config value, it just happens to have been
# written around the time of int_max_str_digits. Refactoring is okay.
code = """if 1:
import sys, _testinternalcapi
# Any config value would do, this happens to be the one being
# double checked at the time this test was written.
config = _testinternalcapi.get_config()
config['int_max_str_digits'] = 55555
_testinternalcapi.set_config(config)
sub_value = _testinternalcapi.get_config()['int_max_str_digits']
assert sub_value == 55555, sub_value
"""
before_config = _testinternalcapi.get_config()
assert before_config['int_max_str_digits'] != 55555
self.assertEqual(support.run_in_subinterp(code), 0,
'subinterp code failure, check stderr.')
after_config = _testinternalcapi.get_config()
self.assertIsNot(
before_config, after_config,
"Expected get_config() to return a new dict on each call")
self.assertEqual(before_config, after_config,
"CAUTION: Tests executed after this may be "
"running under an altered config.")
# try:...finally: calling set_config(before_config) not done
# as that results in sys.argv, sys.path, and sys.warnoptions
# "being modified by test_capi" per test.regrtest. So if this
# test fails, assume that the environment in this process may
# be altered and suspect.
@unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
def test_configured_settings(self):
"""
The config with which an interpreter is created corresponds
1-to-1 with the new interpreter's settings. This test verifies
that they match.
"""
OBMALLOC = 1<<5
EXTENSIONS = 1<<8
THREADS = 1<<10
DAEMON_THREADS = 1<<11
FORK = 1<<15
EXEC = 1<<16
ALL_FLAGS = (OBMALLOC | FORK | EXEC | THREADS | DAEMON_THREADS
| EXTENSIONS);
features = [
'obmalloc',
'fork',
'exec',
'threads',
'daemon_threads',
'extensions',
'own_gil',
]
kwlist = [f'allow_{n}' for n in features]
kwlist[0] = 'use_main_obmalloc'
kwlist[-2] = 'check_multi_interp_extensions'
kwlist[-1] = 'own_gil'
# expected to work
for config, expected in {
(True, True, True, True, True, True, True):
(ALL_FLAGS, True),
(True, False, False, False, False, False, False):
(OBMALLOC, False),
(False, False, False, True, False, True, False):
(THREADS | EXTENSIONS, False),
}.items():
kwargs = dict(zip(kwlist, config))
exp_flags, exp_gil = expected
expected = {
'feature_flags': exp_flags,
'own_gil': exp_gil,
}
with self.subTest(config):
r, w = os.pipe()
script = textwrap.dedent(f'''
import _testinternalcapi, json, os
settings = _testinternalcapi.get_interp_settings()
with os.fdopen({w}, "w") as stdin:
json.dump(settings, stdin)
''')
with os.fdopen(r) as stdout:
ret = support.run_in_subinterp_with_config(script, **kwargs)
self.assertEqual(ret, 0)
out = stdout.read()
settings = json.loads(out)
self.assertEqual(settings, expected)
# expected to fail
for config in [
(False, False, False, False, False, False, False),
]:
kwargs = dict(zip(kwlist, config))
with self.subTest(config):
script = textwrap.dedent(f'''
import _testinternalcapi
_testinternalcapi.get_interp_settings()
raise NotImplementedError('unreachable')
''')
with self.assertRaises(RuntimeError):
support.run_in_subinterp_with_config(script, **kwargs)
@unittest.skipIf(_testsinglephase is None, "test requires _testsinglephase module")
@unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
def test_overridden_setting_extensions_subinterp_check(self):
"""
PyInterpreterConfig.check_multi_interp_extensions can be overridden
with PyInterpreterState.override_multi_interp_extensions_check.
This verifies that the override works but does not modify
the underlying setting.
"""
OBMALLOC = 1<<5
EXTENSIONS = 1<<8
THREADS = 1<<10
DAEMON_THREADS = 1<<11
FORK = 1<<15
EXEC = 1<<16
BASE_FLAGS = OBMALLOC | FORK | EXEC | THREADS | DAEMON_THREADS
base_kwargs = {
'use_main_obmalloc': True,
'allow_fork': True,
'allow_exec': True,
'allow_threads': True,
'allow_daemon_threads': True,
'own_gil': False,
}
def check(enabled, override):
kwargs = dict(
base_kwargs,
check_multi_interp_extensions=enabled,
)
flags = BASE_FLAGS | EXTENSIONS if enabled else BASE_FLAGS
settings = {
'feature_flags': flags,
'own_gil': False,
}
expected = {
'requested': override,
'override__initial': 0,
'override_after': override,
'override_restored': 0,
# The override should not affect the config or settings.
'settings__initial': settings,
'settings_after': settings,
'settings_restored': settings,
# These are the most likely values to be wrong.
'allowed__initial': not enabled,
'allowed_after': not ((override > 0) if override else enabled),
'allowed_restored': not enabled,
}
r, w = os.pipe()
script = textwrap.dedent(f'''
from test.test_capi.check_config import run_singlephase_check
run_singlephase_check({override}, {w})
''')
with os.fdopen(r) as stdout:
ret = support.run_in_subinterp_with_config(script, **kwargs)
self.assertEqual(ret, 0)
out = stdout.read()
results = json.loads(out)
self.assertEqual(results, expected)
self.maxDiff = None
# setting: check disabled
with self.subTest('config: check disabled; override: disabled'):
check(False, -1)
with self.subTest('config: check disabled; override: use config'):
check(False, 0)
with self.subTest('config: check disabled; override: enabled'):
check(False, 1)
# setting: check enabled
with self.subTest('config: check enabled; override: disabled'):
check(True, -1)
with self.subTest('config: check enabled; override: use config'):
check(True, 0)
with self.subTest('config: check enabled; override: enabled'):
check(True, 1)
def test_mutate_exception(self):
"""
Exceptions saved in global module state get shared between
individual module instances. This test checks whether or not
a change in one interpreter's module gets reflected into the
other ones.
"""
import binascii
support.run_in_subinterp("import binascii; binascii.Error.foobar = 'foobar'")
self.assertFalse(hasattr(binascii.Error, "foobar"))
@unittest.skipIf(_testmultiphase is None, "test requires _testmultiphase module")
def test_module_state_shared_in_global(self):
"""
bpo-44050: Extension module state should be shared between interpreters
when it doesn't support sub-interpreters.
"""
r, w = os.pipe()
self.addCleanup(os.close, r)
self.addCleanup(os.close, w)
script = textwrap.dedent(f"""
import importlib.machinery
import importlib.util
import os
fullname = '_test_module_state_shared'
origin = importlib.util.find_spec('_testmultiphase').origin
loader = importlib.machinery.ExtensionFileLoader(fullname, origin)
spec = importlib.util.spec_from_loader(fullname, loader)
module = importlib.util.module_from_spec(spec)
attr_id = str(id(module.Error)).encode()
os.write({w}, attr_id)
""")
exec(script)
main_attr_id = os.read(r, 100)
ret = support.run_in_subinterp(script)
self.assertEqual(ret, 0)
subinterp_attr_id = os.read(r, 100)
self.assertEqual(main_attr_id, subinterp_attr_id)
class BuiltinStaticTypesTests(unittest.TestCase):
TYPES = [
object,
type,
int,
str,
dict,
type(None),
bool,
BaseException,
Exception,
Warning,
DeprecationWarning, # Warning subclass
]
def test_tp_bases_is_set(self):
# PyTypeObject.tp_bases is documented as public API.
# See https://github.com/python/cpython/issues/105020.
for typeobj in self.TYPES:
with self.subTest(typeobj):
bases = _testcapi.type_get_tp_bases(typeobj)
self.assertIsNot(bases, None)
def test_tp_mro_is_set(self):
# PyTypeObject.tp_bases is documented as public API.
# See https://github.com/python/cpython/issues/105020.
for typeobj in self.TYPES:
with self.subTest(typeobj):
mro = _testcapi.type_get_tp_mro(typeobj)
self.assertIsNot(mro, None)
class TestStaticTypes(unittest.TestCase):
_has_run = False
@classmethod
def setUpClass(cls):
# The tests here don't play nice with our approach to refleak
# detection, so we bail out in that case.
if cls._has_run:
raise unittest.SkipTest('these tests do not support re-running')
cls._has_run = True
@contextlib.contextmanager
def basic_static_type(self, *args):
cls = _testcapi.get_basic_static_type(*args)
yield cls
def test_pytype_ready_always_sets_tp_type(self):
# The point of this test is to prevent something like
# https://github.com/python/cpython/issues/104614
# from happening again.
# First check when tp_base/tp_bases is *not* set before PyType_Ready().
with self.basic_static_type() as cls:
self.assertIs(cls.__base__, object);
self.assertEqual(cls.__bases__, (object,));
self.assertIs(type(cls), type(object));
# Then check when we *do* set tp_base/tp_bases first.
with self.basic_static_type(object) as cls:
self.assertIs(cls.__base__, object);
self.assertEqual(cls.__bases__, (object,));
self.assertIs(type(cls), type(object));
class TestThreadState(unittest.TestCase):
@threading_helper.reap_threads
@threading_helper.requires_working_threading()
def test_thread_state(self):
# some extra thread-state tests driven via _testcapi
def target():
idents = []
def callback():
idents.append(threading.get_ident())
_testcapi._test_thread_state(callback)
a = b = callback
time.sleep(1)
# Check our main thread is in the list exactly 3 times.
self.assertEqual(idents.count(threading.get_ident()), 3,
"Couldn't find main thread correctly in the list")
target()
t = threading.Thread(target=target)
t.start()
t.join()
@threading_helper.reap_threads
@threading_helper.requires_working_threading()
def test_gilstate_ensure_no_deadlock(self):
# See https://github.com/python/cpython/issues/96071
code = textwrap.dedent("""
import _testcapi
def callback():
print('callback called')
_testcapi._test_thread_state(callback)
""")
ret = assert_python_ok('-X', 'tracemalloc', '-c', code)
self.assertIn(b'callback called', ret.out)
def test_gilstate_matches_current(self):
_testcapi.test_current_tstate_matches()
class Test_testcapi(unittest.TestCase):
locals().update((name, getattr(_testcapi, name))
for name in dir(_testcapi)
if name.startswith('test_'))
# Suppress warning from PyUnicode_FromUnicode().
@warnings_helper.ignore_warnings(category=DeprecationWarning)
def test_widechar(self):
_testcapi.test_widechar()
def test_version_api_data(self):
self.assertEqual(_testcapi.Py_Version, sys.hexversion)
class Test_testinternalcapi(unittest.TestCase):
locals().update((name, getattr(_testinternalcapi, name))
for name in dir(_testinternalcapi)
if name.startswith('test_')
and not name.startswith('test_lock_'))
@threading_helper.requires_working_threading()
class Test_PyLock(unittest.TestCase):
locals().update((name, getattr(_testinternalcapi, name))
for name in dir(_testinternalcapi)
if name.startswith('test_lock_'))
@unittest.skipIf(_testmultiphase is None, "test requires _testmultiphase module")
class Test_ModuleStateAccess(unittest.TestCase):
"""Test access to module start (PEP 573)"""
# The C part of the tests lives in _testmultiphase, in a module called
# _testmultiphase_meth_state_access.
# This module has multi-phase initialization, unlike _testcapi.
def setUp(self):
fullname = '_testmultiphase_meth_state_access' # XXX
origin = importlib.util.find_spec('_testmultiphase').origin
loader = importlib.machinery.ExtensionFileLoader(fullname, origin)
spec = importlib.util.spec_from_loader(fullname, loader)
module = importlib.util.module_from_spec(spec)
loader.exec_module(module)
self.module = module
def test_subclass_get_module(self):
"""PyType_GetModule for defining_class"""
class StateAccessType_Subclass(self.module.StateAccessType):
pass
instance = StateAccessType_Subclass()
self.assertIs(instance.get_defining_module(), self.module)
def test_subclass_get_module_with_super(self):
class StateAccessType_Subclass(self.module.StateAccessType):
def get_defining_module(self):
return super().get_defining_module()
instance = StateAccessType_Subclass()
self.assertIs(instance.get_defining_module(), self.module)
def test_state_access(self):
"""Checks methods defined with and without argument clinic
This tests a no-arg method (get_count) and a method with
both a positional and keyword argument.
"""
a = self.module.StateAccessType()
b = self.module.StateAccessType()
methods = {
'clinic': a.increment_count_clinic,
'noclinic': a.increment_count_noclinic,
}
for name, increment_count in methods.items():
with self.subTest(name):
self.assertEqual(a.get_count(), b.get_count())
self.assertEqual(a.get_count(), 0)
increment_count()
self.assertEqual(a.get_count(), b.get_count())
self.assertEqual(a.get_count(), 1)
increment_count(3)
self.assertEqual(a.get_count(), b.get_count())
self.assertEqual(a.get_count(), 4)
increment_count(-2, twice=True)
self.assertEqual(a.get_count(), b.get_count())
self.assertEqual(a.get_count(), 0)
with self.assertRaises(TypeError):
increment_count(thrice=3)
with self.assertRaises(TypeError):
increment_count(1, 2, 3)
def test_get_module_bad_def(self):
# PyType_GetModuleByDef fails gracefully if it doesn't
# find what it's looking for.
# see bpo-46433
instance = self.module.StateAccessType()
with self.assertRaises(TypeError):
instance.getmodulebydef_bad_def()
def test_get_module_static_in_mro(self):
# Here, the class PyType_GetModuleByDef is looking for
# appears in the MRO after a static type (Exception).
# see bpo-46433
class Subclass(BaseException, self.module.StateAccessType):
pass
self.assertIs(Subclass().get_defining_module(), self.module)
class TestInternalFrameApi(unittest.TestCase):
@staticmethod
def func():
return sys._getframe()
def test_code(self):
frame = self.func()
code = _testinternalcapi.iframe_getcode(frame)
self.assertIs(code, self.func.__code__)
def test_lasti(self):
frame = self.func()
lasti = _testinternalcapi.iframe_getlasti(frame)
self.assertGreater(lasti, 0)
self.assertLess(lasti, len(self.func.__code__.co_code))
def test_line(self):
frame = self.func()
line = _testinternalcapi.iframe_getline(frame)
firstline = self.func.__code__.co_firstlineno
self.assertEqual(line, firstline + 2)
SUFFICIENT_TO_DEOPT_AND_SPECIALIZE = 100
class Test_Pep523API(unittest.TestCase):
def do_test(self, func, names):
actual_calls = []
start = SUFFICIENT_TO_DEOPT_AND_SPECIALIZE
count = start + SUFFICIENT_TO_DEOPT_AND_SPECIALIZE
try:
for i in range(count):
if i == start:
_testinternalcapi.set_eval_frame_record(actual_calls)
func()
finally:
_testinternalcapi.set_eval_frame_default()
expected_calls = names * SUFFICIENT_TO_DEOPT_AND_SPECIALIZE
self.assertEqual(len(expected_calls), len(actual_calls))
for expected, actual in zip(expected_calls, actual_calls, strict=True):
self.assertEqual(expected, actual)
def test_inlined_binary_subscr(self):
class C:
def __getitem__(self, other):
return None
def func():
C()[42]
names = ["func", "__getitem__"]
self.do_test(func, names)
def test_inlined_call(self):
def inner(x=42):
pass
def func():
inner()
inner(42)
names = ["func", "inner", "inner"]
self.do_test(func, names)
def test_inlined_call_function_ex(self):
def inner(x):
pass
def func():
inner(*[42])
names = ["func", "inner"]
self.do_test(func, names)
def test_inlined_for_iter(self):
def gen():
yield 42
def func():
for _ in gen():
pass
names = ["func", "gen", "gen", "gen"]
self.do_test(func, names)
def test_inlined_load_attr(self):
class C:
@property
def a(self):
return 42
class D:
def __getattribute__(self, name):
return 42
def func():
C().a
D().a
names = ["func", "a", "__getattribute__"]
self.do_test(func, names)
def test_inlined_send(self):
def inner():
yield 42
def outer():
yield from inner()
def func():
list(outer())
names = ["func", "outer", "outer", "inner", "inner", "outer", "inner"]
self.do_test(func, names)
@contextlib.contextmanager
def temporary_optimizer(opt):
old_opt = _testinternalcapi.get_optimizer()
_testinternalcapi.set_optimizer(opt)
try:
yield
finally:
_testinternalcapi.set_optimizer(old_opt)
@contextlib.contextmanager
def clear_executors(func):
# Clear executors in func before and after running a block
func.__code__ = func.__code__.replace()
try:
yield
finally:
func.__code__ = func.__code__.replace()
class TestOptimizerAPI(unittest.TestCase):
def test_get_counter_optimizer_dealloc(self):
# See gh-108727
def f():
_testinternalcapi.get_counter_optimizer()
f()
def test_get_set_optimizer(self):
old = _testinternalcapi.get_optimizer()
opt = _testinternalcapi.get_counter_optimizer()
try:
_testinternalcapi.set_optimizer(opt)
self.assertEqual(_testinternalcapi.get_optimizer(), opt)
_testinternalcapi.set_optimizer(None)
self.assertEqual(_testinternalcapi.get_optimizer(), None)
finally:
_testinternalcapi.set_optimizer(old)
def test_counter_optimizer(self):
# Generate a new function at each call
ns = {}
exec(textwrap.dedent("""
def loop():
for _ in range(1000):
pass
"""), ns, ns)
loop = ns['loop']
for repeat in range(5):
opt = _testinternalcapi.get_counter_optimizer()
with temporary_optimizer(opt):
self.assertEqual(opt.get_count(), 0)
with clear_executors(loop):
loop()
self.assertEqual(opt.get_count(), 1000)
def test_long_loop(self):
"Check that we aren't confused by EXTENDED_ARG"
# Generate a new function at each call
ns = {}
exec(textwrap.dedent("""
def nop():
pass
def long_loop():
for _ in range(10):
nop(); nop(); nop(); nop(); nop(); nop(); nop(); nop();
nop(); nop(); nop(); nop(); nop(); nop(); nop(); nop();
nop(); nop(); nop(); nop(); nop(); nop(); nop(); nop();
nop(); nop(); nop(); nop(); nop(); nop(); nop(); nop();
nop(); nop(); nop(); nop(); nop(); nop(); nop(); nop();
nop(); nop(); nop(); nop(); nop(); nop(); nop(); nop();
nop(); nop(); nop(); nop(); nop(); nop(); nop(); nop();
"""), ns, ns)
long_loop = ns['long_loop']
opt = _testinternalcapi.get_counter_optimizer()
with temporary_optimizer(opt):
self.assertEqual(opt.get_count(), 0)
long_loop()
self.assertEqual(opt.get_count(), 10)
def test_code_restore_for_ENTER_EXECUTOR(self):
def testfunc(x):
i = 0
while i < x:
i += 1
opt = _testinternalcapi.get_counter_optimizer()
with temporary_optimizer(opt):
testfunc(1000)
code, replace_code = testfunc.__code__, testfunc.__code__.replace()
self.assertEqual(code, replace_code)
self.assertEqual(hash(code), hash(replace_code))
def get_first_executor(func):
code = func.__code__
co_code = code.co_code
JUMP_BACKWARD = opcode.opmap["JUMP_BACKWARD"]
for i in range(0, len(co_code), 2):
if co_code[i] == JUMP_BACKWARD:
try:
return _testinternalcapi.get_executor(code, i)
except ValueError:
pass
return None
class TestExecutorInvalidation(unittest.TestCase):
def setUp(self):
self.old = _testinternalcapi.get_optimizer()
self.opt = _testinternalcapi.get_counter_optimizer()
_testinternalcapi.set_optimizer(self.opt)
def tearDown(self):
_testinternalcapi.set_optimizer(self.old)
def test_invalidate_object(self):
# Generate a new set of functions at each call
ns = {}
func_src = "\n".join(
f"""
def f{n}():
for _ in range(1000):
pass
""" for n in range(5)
)
exec(textwrap.dedent(func_src), ns, ns)
funcs = [ ns[f'f{n}'] for n in range(5)]
objects = [object() for _ in range(5)]
for f in funcs:
f()
executors = [get_first_executor(f) for f in funcs]
# Set things up so each executor depends on the objects
# with an equal or lower index.
for i, exe in enumerate(executors):
self.assertTrue(exe.is_valid())
for obj in objects[:i+1]:
_testinternalcapi.add_executor_dependency(exe, obj)
self.assertTrue(exe.is_valid())
# Assert that the correct executors are invalidated
# and check that nothing crashes when we invalidate
# an executor mutliple times.
for i in (4,3,2,1,0):
_testinternalcapi.invalidate_executors(objects[i])
for exe in executors[i:]:
self.assertFalse(exe.is_valid())
for exe in executors[:i]:
self.assertTrue(exe.is_valid())
def test_uop_optimizer_invalidation(self):
# Generate a new function at each call
ns = {}
exec(textwrap.dedent("""
def f():
for i in range(1000):
pass
"""), ns, ns)
f = ns['f']
opt = _testinternalcapi.get_uop_optimizer()
with temporary_optimizer(opt):
f()
exe = get_first_executor(f)
self.assertTrue(exe.is_valid())
_testinternalcapi.invalidate_executors(f.__code__)
self.assertFalse(exe.is_valid())
class TestUops(unittest.TestCase):
def test_basic_loop(self):
def testfunc(x):
i = 0
while i < x:
i += 1
opt = _testinternalcapi.get_uop_optimizer()
with temporary_optimizer(opt):
testfunc(1000)
ex = get_first_executor(testfunc)
self.assertIsNotNone(ex)
uops = {opname for opname, _, _ in ex}
self.assertIn("_SET_IP", uops)
self.assertIn("LOAD_FAST", uops)
def test_extended_arg(self):
"Check EXTENDED_ARG handling in superblock creation"
ns = {}
exec(textwrap.dedent("""
def many_vars():
# 260 vars, so z9 should have index 259
a0 = a1 = a2 = a3 = a4 = a5 = a6 = a7 = a8 = a9 = 42
b0 = b1 = b2 = b3 = b4 = b5 = b6 = b7 = b8 = b9 = 42
c0 = c1 = c2 = c3 = c4 = c5 = c6 = c7 = c8 = c9 = 42
d0 = d1 = d2 = d3 = d4 = d5 = d6 = d7 = d8 = d9 = 42
e0 = e1 = e2 = e3 = e4 = e5 = e6 = e7 = e8 = e9 = 42
f0 = f1 = f2 = f3 = f4 = f5 = f6 = f7 = f8 = f9 = 42
g0 = g1 = g2 = g3 = g4 = g5 = g6 = g7 = g8 = g9 = 42
h0 = h1 = h2 = h3 = h4 = h5 = h6 = h7 = h8 = h9 = 42
i0 = i1 = i2 = i3 = i4 = i5 = i6 = i7 = i8 = i9 = 42
j0 = j1 = j2 = j3 = j4 = j5 = j6 = j7 = j8 = j9 = 42
k0 = k1 = k2 = k3 = k4 = k5 = k6 = k7 = k8 = k9 = 42
l0 = l1 = l2 = l3 = l4 = l5 = l6 = l7 = l8 = l9 = 42
m0 = m1 = m2 = m3 = m4 = m5 = m6 = m7 = m8 = m9 = 42
n0 = n1 = n2 = n3 = n4 = n5 = n6 = n7 = n8 = n9 = 42
o0 = o1 = o2 = o3 = o4 = o5 = o6 = o7 = o8 = o9 = 42
p0 = p1 = p2 = p3 = p4 = p5 = p6 = p7 = p8 = p9 = 42
q0 = q1 = q2 = q3 = q4 = q5 = q6 = q7 = q8 = q9 = 42
r0 = r1 = r2 = r3 = r4 = r5 = r6 = r7 = r8 = r9 = 42
s0 = s1 = s2 = s3 = s4 = s5 = s6 = s7 = s8 = s9 = 42
t0 = t1 = t2 = t3 = t4 = t5 = t6 = t7 = t8 = t9 = 42
u0 = u1 = u2 = u3 = u4 = u5 = u6 = u7 = u8 = u9 = 42
v0 = v1 = v2 = v3 = v4 = v5 = v6 = v7 = v8 = v9 = 42
w0 = w1 = w2 = w3 = w4 = w5 = w6 = w7 = w8 = w9 = 42
x0 = x1 = x2 = x3 = x4 = x5 = x6 = x7 = x8 = x9 = 42
y0 = y1 = y2 = y3 = y4 = y5 = y6 = y7 = y8 = y9 = 42
z0 = z1 = z2 = z3 = z4 = z5 = z6 = z7 = z8 = z9 = 42
while z9 > 0:
z9 = z9 - 1
"""), ns, ns)
many_vars = ns["many_vars"]
opt = _testinternalcapi.get_uop_optimizer()
with temporary_optimizer(opt):
ex = get_first_executor(many_vars)
self.assertIsNone(ex)
many_vars()
ex = get_first_executor(many_vars)
self.assertIsNotNone(ex)
self.assertIn(("LOAD_FAST", 259, 0), list(ex))
def test_unspecialized_unpack(self):
# An example of an unspecialized opcode
def testfunc(x):
i = 0
while i < x:
i += 1
a, b = {1: 2, 3: 3}
assert a == 1 and b == 3
i = 0
while i < x:
i += 1
opt = _testinternalcapi.get_uop_optimizer()
with temporary_optimizer(opt):
testfunc(20)
ex = get_first_executor(testfunc)
self.assertIsNotNone(ex)
uops = {opname for opname, _, _ in ex}
self.assertIn("UNPACK_SEQUENCE", uops)
def test_pop_jump_if_false(self):
def testfunc(n):
i = 0
while i < n:
i += 1
opt = _testinternalcapi.get_uop_optimizer()
with temporary_optimizer(opt):
testfunc(20)
ex = get_first_executor(testfunc)
self.assertIsNotNone(ex)
uops = {opname for opname, _, _ in ex}
self.assertIn("_POP_JUMP_IF_FALSE", uops)
def test_pop_jump_if_none(self):
def testfunc(a):
for x in a:
if x is None:
x = 0
opt = _testinternalcapi.get_uop_optimizer()
with temporary_optimizer(opt):
testfunc(range(20))
ex = get_first_executor(testfunc)
self.assertIsNotNone(ex)
uops = {opname for opname, _, _ in ex}
self.assertIn("_POP_JUMP_IF_TRUE", uops)
def test_pop_jump_if_not_none(self):
def testfunc(a):
for x in a:
x = None
if x is not None:
x = 0
opt = _testinternalcapi.get_uop_optimizer()
with temporary_optimizer(opt):
testfunc(range(20))
ex = get_first_executor(testfunc)
self.assertIsNotNone(ex)
uops = {opname for opname, _, _ in ex}
self.assertIn("_POP_JUMP_IF_FALSE", uops)
def test_pop_jump_if_true(self):
def testfunc(n):
i = 0
while not i >= n:
i += 1
opt = _testinternalcapi.get_uop_optimizer()
with temporary_optimizer(opt):
testfunc(20)
ex = get_first_executor(testfunc)
self.assertIsNotNone(ex)
uops = {opname for opname, _, _ in ex}
self.assertIn("_POP_JUMP_IF_TRUE", uops)
def test_jump_backward(self):
def testfunc(n):
i = 0
while i < n:
i += 1
opt = _testinternalcapi.get_uop_optimizer()
with temporary_optimizer(opt):
testfunc(20)
ex = get_first_executor(testfunc)
self.assertIsNotNone(ex)
uops = {opname for opname, _, _ in ex}
self.assertIn("_JUMP_TO_TOP", uops)
def test_jump_forward(self):
def testfunc(n):
a = 0
while a < n:
if a < 0:
a = -a
else:
a = +a
a += 1
return a
opt = _testinternalcapi.get_uop_optimizer()
with temporary_optimizer(opt):
testfunc(20)
ex = get_first_executor(testfunc)
self.assertIsNotNone(ex)
uops = {opname for opname, _, _ in ex}
# Since there is no JUMP_FORWARD instruction,
# look for indirect evidence: the += operator
self.assertIn("_BINARY_OP_ADD_INT", uops)
def test_for_iter_range(self):
def testfunc(n):
total = 0
for i in range(n):
total += i
return total
opt = _testinternalcapi.get_uop_optimizer()
with temporary_optimizer(opt):
total = testfunc(20)
self.assertEqual(total, 190)
ex = get_first_executor(testfunc)
self.assertIsNotNone(ex)
# for i, (opname, oparg) in enumerate(ex):
# print(f"{i:4d}: {opname:<20s} {oparg:3d}")
uops = {opname for opname, _, _ in ex}
self.assertIn("_IS_ITER_EXHAUSTED_RANGE", uops)
# Verification that the jump goes past END_FOR
# is done by manual inspection of the output
def test_for_iter_list(self):
def testfunc(a):
total = 0
for i in a:
total += i
return total
opt = _testinternalcapi.get_uop_optimizer()
with temporary_optimizer(opt):
a = list(range(20))
total = testfunc(a)
self.assertEqual(total, 190)
ex = get_first_executor(testfunc)
self.assertIsNotNone(ex)
# for i, (opname, oparg) in enumerate(ex):
# print(f"{i:4d}: {opname:<20s} {oparg:3d}")
uops = {opname for opname, _, _ in ex}
self.assertIn("_IS_ITER_EXHAUSTED_LIST", uops)
# Verification that the jump goes past END_FOR
# is done by manual inspection of the output
def test_for_iter_tuple(self):
def testfunc(a):
total = 0
for i in a:
total += i
return total
opt = _testinternalcapi.get_uop_optimizer()
with temporary_optimizer(opt):
a = tuple(range(20))
total = testfunc(a)
self.assertEqual(total, 190)
ex = get_first_executor(testfunc)
self.assertIsNotNone(ex)
# for i, (opname, oparg) in enumerate(ex):
# print(f"{i:4d}: {opname:<20s} {oparg:3d}")
uops = {opname for opname, _, _ in ex}
self.assertIn("_IS_ITER_EXHAUSTED_TUPLE", uops)
# Verification that the jump goes past END_FOR
# is done by manual inspection of the output
def test_list_edge_case(self):
def testfunc(it):
for x in it:
pass
opt = _testinternalcapi.get_uop_optimizer()
with temporary_optimizer(opt):
a = [1, 2, 3]
it = iter(a)
testfunc(it)
a.append(4)
with self.assertRaises(StopIteration):
next(it)
def test_call_py_exact_args(self):
def testfunc(n):
def dummy(x):
return x+1
for i in range(n):
dummy(i)
opt = _testinternalcapi.get_uop_optimizer()
with temporary_optimizer(opt):
testfunc(20)
ex = get_first_executor(testfunc)
self.assertIsNotNone(ex)
uops = {opname for opname, _, _ in ex}
self.assertIn("_PUSH_FRAME", uops)
self.assertIn("_BINARY_OP_ADD_INT", uops)
def test_branch_taken(self):
def testfunc(n):
for i in range(n):
if i < 0:
i = 0
else:
i = 1
opt = _testinternalcapi.get_uop_optimizer()
with temporary_optimizer(opt):
testfunc(20)
ex = get_first_executor(testfunc)
self.assertIsNotNone(ex)
uops = {opname for opname, _, _ in ex}
self.assertIn("_POP_JUMP_IF_TRUE", uops)
if __name__ == "__main__":
unittest.main()
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