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Save
Rename
import copy import pickle import dis import threading import types import unittest from test.support import threading_helper, check_impl_detail, requires_specialization from test.support.import_helper import import_module # Skip this module on other interpreters, it is cpython specific: if check_impl_detail(cpython=False): raise unittest.SkipTest('implementation detail specific to cpython') _testinternalcapi = import_module("_testinternalcapi") def disabling_optimizer(func): def wrapper(*args, **kwargs): if not hasattr(_testinternalcapi, "get_optimizer"): return func(*args, **kwargs) old_opt = _testinternalcapi.get_optimizer() _testinternalcapi.set_optimizer(None) try: return func(*args, **kwargs) finally: _testinternalcapi.set_optimizer(old_opt) return wrapper class TestBase(unittest.TestCase): def assert_specialized(self, f, opname): instructions = dis.get_instructions(f, adaptive=True) opnames = {instruction.opname for instruction in instructions} self.assertIn(opname, opnames) class TestLoadSuperAttrCache(unittest.TestCase): def test_descriptor_not_double_executed_on_spec_fail(self): calls = [] class Descriptor: def __get__(self, instance, owner): calls.append((instance, owner)) return lambda: 1 class C: d = Descriptor() class D(C): def f(self): return super().d() d = D() self.assertEqual(d.f(), 1) # warmup calls.clear() self.assertEqual(d.f(), 1) # try to specialize self.assertEqual(calls, [(d, D)]) class TestLoadAttrCache(unittest.TestCase): def test_descriptor_added_after_optimization(self): class Descriptor: pass class C: def __init__(self): self.x = 1 x = Descriptor() def f(o): return o.x o = C() for i in range(1025): assert f(o) == 1 Descriptor.__get__ = lambda self, instance, value: 2 Descriptor.__set__ = lambda *args: None self.assertEqual(f(o), 2) def test_metaclass_descriptor_added_after_optimization(self): class Descriptor: pass class Metaclass(type): attribute = Descriptor() class Class(metaclass=Metaclass): attribute = True def __get__(self, instance, owner): return False def __set__(self, instance, value): return None def f(): return Class.attribute for _ in range(1025): self.assertTrue(f()) Descriptor.__get__ = __get__ Descriptor.__set__ = __set__ for _ in range(1025): self.assertFalse(f()) def test_metaclass_descriptor_shadows_class_attribute(self): class Metaclass(type): @property def attribute(self): return True class Class(metaclass=Metaclass): attribute = False def f(): return Class.attribute for _ in range(1025): self.assertTrue(f()) def test_metaclass_set_descriptor_after_optimization(self): class Metaclass(type): pass class Class(metaclass=Metaclass): attribute = True @property def attribute(self): return False def f(): return Class.attribute for _ in range(1025): self.assertTrue(f()) Metaclass.attribute = attribute for _ in range(1025): self.assertFalse(f()) def test_metaclass_del_descriptor_after_optimization(self): class Metaclass(type): @property def attribute(self): return True class Class(metaclass=Metaclass): attribute = False def f(): return Class.attribute for _ in range(1025): self.assertTrue(f()) del Metaclass.attribute for _ in range(1025): self.assertFalse(f()) def test_type_descriptor_shadows_attribute_method(self): class Class: mro = None def f(): return Class.mro for _ in range(1025): self.assertIsNone(f()) def test_type_descriptor_shadows_attribute_member(self): class Class: __base__ = None def f(): return Class.__base__ for _ in range(1025): self.assertIs(f(), object) def test_type_descriptor_shadows_attribute_getset(self): class Class: __name__ = "Spam" def f(): return Class.__name__ for _ in range(1025): self.assertEqual(f(), "Class") def test_metaclass_getattribute(self): class Metaclass(type): def __getattribute__(self, name): return True class Class(metaclass=Metaclass): attribute = False def f(): return Class.attribute for _ in range(1025): self.assertTrue(f()) def test_metaclass_swap(self): class OldMetaclass(type): @property def attribute(self): return True class NewMetaclass(type): @property def attribute(self): return False class Class(metaclass=OldMetaclass): pass def f(): return Class.attribute for _ in range(1025): self.assertTrue(f()) Class.__class__ = NewMetaclass for _ in range(1025): self.assertFalse(f()) def test_load_shadowing_slot_should_raise_type_error(self): class Class: __slots__ = ("slot",) class Sneaky: __slots__ = ("shadowed",) shadowing = Class.slot def f(o): o.shadowing o = Sneaky() o.shadowed = 42 for _ in range(1025): with self.assertRaises(TypeError): f(o) def test_store_shadowing_slot_should_raise_type_error(self): class Class: __slots__ = ("slot",) class Sneaky: __slots__ = ("shadowed",) shadowing = Class.slot def f(o): o.shadowing = 42 o = Sneaky() for _ in range(1025): with self.assertRaises(TypeError): f(o) def test_load_borrowed_slot_should_not_crash(self): class Class: __slots__ = ("slot",) class Sneaky: borrowed = Class.slot def f(o): o.borrowed o = Sneaky() for _ in range(1025): with self.assertRaises(TypeError): f(o) def test_store_borrowed_slot_should_not_crash(self): class Class: __slots__ = ("slot",) class Sneaky: borrowed = Class.slot def f(o): o.borrowed = 42 o = Sneaky() for _ in range(1025): with self.assertRaises(TypeError): f(o) class TestLoadMethodCache(unittest.TestCase): def test_descriptor_added_after_optimization(self): class Descriptor: pass class Class: attribute = Descriptor() def __get__(self, instance, owner): return lambda: False def __set__(self, instance, value): return None def attribute(): return True instance = Class() instance.attribute = attribute def f(): return instance.attribute() for _ in range(1025): self.assertTrue(f()) Descriptor.__get__ = __get__ Descriptor.__set__ = __set__ for _ in range(1025): self.assertFalse(f()) def test_metaclass_descriptor_added_after_optimization(self): class Descriptor: pass class Metaclass(type): attribute = Descriptor() class Class(metaclass=Metaclass): def attribute(): return True def __get__(self, instance, owner): return lambda: False def __set__(self, instance, value): return None def f(): return Class.attribute() for _ in range(1025): self.assertTrue(f()) Descriptor.__get__ = __get__ Descriptor.__set__ = __set__ for _ in range(1025): self.assertFalse(f()) def test_metaclass_descriptor_shadows_class_attribute(self): class Metaclass(type): @property def attribute(self): return lambda: True class Class(metaclass=Metaclass): def attribute(): return False def f(): return Class.attribute() for _ in range(1025): self.assertTrue(f()) def test_metaclass_set_descriptor_after_optimization(self): class Metaclass(type): pass class Class(metaclass=Metaclass): def attribute(): return True @property def attribute(self): return lambda: False def f(): return Class.attribute() for _ in range(1025): self.assertTrue(f()) Metaclass.attribute = attribute for _ in range(1025): self.assertFalse(f()) def test_metaclass_del_descriptor_after_optimization(self): class Metaclass(type): @property def attribute(self): return lambda: True class Class(metaclass=Metaclass): def attribute(): return False def f(): return Class.attribute() for _ in range(1025): self.assertTrue(f()) del Metaclass.attribute for _ in range(1025): self.assertFalse(f()) def test_type_descriptor_shadows_attribute_method(self): class Class: def mro(): return ["Spam", "eggs"] def f(): return Class.mro() for _ in range(1025): self.assertEqual(f(), ["Spam", "eggs"]) def test_type_descriptor_shadows_attribute_member(self): class Class: def __base__(): return "Spam" def f(): return Class.__base__() for _ in range(1025): self.assertNotEqual(f(), "Spam") def test_metaclass_getattribute(self): class Metaclass(type): def __getattribute__(self, name): return lambda: True class Class(metaclass=Metaclass): def attribute(): return False def f(): return Class.attribute() for _ in range(1025): self.assertTrue(f()) def test_metaclass_swap(self): class OldMetaclass(type): @property def attribute(self): return lambda: True class NewMetaclass(type): @property def attribute(self): return lambda: False class Class(metaclass=OldMetaclass): pass def f(): return Class.attribute() for _ in range(1025): self.assertTrue(f()) Class.__class__ = NewMetaclass for _ in range(1025): self.assertFalse(f()) class TestCallCache(TestBase): def test_too_many_defaults_0(self): def f(): pass f.__defaults__ = (None,) for _ in range(1025): f() def test_too_many_defaults_1(self): def f(x): pass f.__defaults__ = (None, None) for _ in range(1025): f(None) f() def test_too_many_defaults_2(self): def f(x, y): pass f.__defaults__ = (None, None, None) for _ in range(1025): f(None, None) f(None) f() @disabling_optimizer @requires_specialization def test_assign_init_code(self): class MyClass: def __init__(self): pass def instantiate(): return MyClass() # Trigger specialization for _ in range(1025): instantiate() self.assert_specialized(instantiate, "CALL_ALLOC_AND_ENTER_INIT") def count_args(self, *args): self.num_args = len(args) # Set MyClass.__init__.__code__ to a code object that is incompatible # (uses varargs) with the current specialization MyClass.__init__.__code__ = count_args.__code__ instantiate() def test_recursion_check_for_general_calls(self): def test(default=None): return test() with self.assertRaises(RecursionError): test() @threading_helper.requires_working_threading() @requires_specialization class TestRacesDoNotCrash(TestBase): # Careful with these. Bigger numbers have a higher chance of catching bugs, # but you can also burn through a *ton* of type/dict/function versions: ITEMS = 1000 LOOPS = 4 WARMUPS = 2 WRITERS = 2 @disabling_optimizer def assert_races_do_not_crash( self, opname, get_items, read, write, *, check_items=False ): # This might need a few dozen loops in some cases: for _ in range(self.LOOPS): items = get_items() # Reset: if check_items: for item in items: item.__code__ = item.__code__.replace() else: read.__code__ = read.__code__.replace() # Specialize: for _ in range(self.WARMUPS): read(items) if check_items: for item in items: self.assert_specialized(item, opname) else: self.assert_specialized(read, opname) # Create writers: writers = [] for _ in range(self.WRITERS): writer = threading.Thread(target=write, args=[items]) writers.append(writer) # Run: for writer in writers: writer.start() read(items) # BOOM! for writer in writers: writer.join() def test_binary_subscr_getitem(self): def get_items(): class C: __getitem__ = lambda self, item: None items = [] for _ in range(self.ITEMS): item = C() items.append(item) return items def read(items): for item in items: try: item[None] except TypeError: pass def write(items): for item in items: try: del item.__getitem__ except AttributeError: pass type(item).__getitem__ = lambda self, item: None opname = "BINARY_SUBSCR_GETITEM" self.assert_races_do_not_crash(opname, get_items, read, write) def test_binary_subscr_list_int(self): def get_items(): items = [] for _ in range(self.ITEMS): item = [None] items.append(item) return items def read(items): for item in items: try: item[0] except IndexError: pass def write(items): for item in items: item.clear() item.append(None) opname = "BINARY_SUBSCR_LIST_INT" self.assert_races_do_not_crash(opname, get_items, read, write) def test_for_iter_gen(self): def get_items(): def g(): yield yield items = [] for _ in range(self.ITEMS): item = g() items.append(item) return items def read(items): for item in items: try: for _ in item: break except ValueError: pass def write(items): for item in items: try: for _ in item: break except ValueError: pass opname = "FOR_ITER_GEN" self.assert_races_do_not_crash(opname, get_items, read, write) def test_for_iter_list(self): def get_items(): items = [] for _ in range(self.ITEMS): item = [None] items.append(item) return items def read(items): for item in items: for item in item: break def write(items): for item in items: item.clear() item.append(None) opname = "FOR_ITER_LIST" self.assert_races_do_not_crash(opname, get_items, read, write) def test_load_attr_class(self): def get_items(): class C: a = object() items = [] for _ in range(self.ITEMS): item = C items.append(item) return items def read(items): for item in items: try: item.a except AttributeError: pass def write(items): for item in items: try: del item.a except AttributeError: pass item.a = object() opname = "LOAD_ATTR_CLASS" self.assert_races_do_not_crash(opname, get_items, read, write) def test_load_attr_getattribute_overridden(self): def get_items(): class C: __getattribute__ = lambda self, name: None items = [] for _ in range(self.ITEMS): item = C() items.append(item) return items def read(items): for item in items: try: item.a except AttributeError: pass def write(items): for item in items: try: del item.__getattribute__ except AttributeError: pass type(item).__getattribute__ = lambda self, name: None opname = "LOAD_ATTR_GETATTRIBUTE_OVERRIDDEN" self.assert_races_do_not_crash(opname, get_items, read, write) def test_load_attr_instance_value(self): def get_items(): class C: pass items = [] for _ in range(self.ITEMS): item = C() item.a = None items.append(item) return items def read(items): for item in items: item.a def write(items): for item in items: item.__dict__[None] = None opname = "LOAD_ATTR_INSTANCE_VALUE" self.assert_races_do_not_crash(opname, get_items, read, write) def test_load_attr_method_lazy_dict(self): def get_items(): class C(Exception): m = lambda self: None items = [] for _ in range(self.ITEMS): item = C() items.append(item) return items def read(items): for item in items: try: item.m() except AttributeError: pass def write(items): for item in items: try: del item.m except AttributeError: pass type(item).m = lambda self: None opname = "LOAD_ATTR_METHOD_LAZY_DICT" self.assert_races_do_not_crash(opname, get_items, read, write) def test_load_attr_method_no_dict(self): def get_items(): class C: __slots__ = () m = lambda self: None items = [] for _ in range(self.ITEMS): item = C() items.append(item) return items def read(items): for item in items: try: item.m() except AttributeError: pass def write(items): for item in items: try: del item.m except AttributeError: pass type(item).m = lambda self: None opname = "LOAD_ATTR_METHOD_NO_DICT" self.assert_races_do_not_crash(opname, get_items, read, write) def test_load_attr_method_with_values(self): def get_items(): class C: m = lambda self: None items = [] for _ in range(self.ITEMS): item = C() items.append(item) return items def read(items): for item in items: try: item.m() except AttributeError: pass def write(items): for item in items: try: del item.m except AttributeError: pass type(item).m = lambda self: None opname = "LOAD_ATTR_METHOD_WITH_VALUES" self.assert_races_do_not_crash(opname, get_items, read, write) def test_load_attr_module(self): def get_items(): items = [] for _ in range(self.ITEMS): item = types.ModuleType("<item>") items.append(item) return items def read(items): for item in items: try: item.__name__ except AttributeError: pass def write(items): for item in items: d = item.__dict__.copy() item.__dict__.clear() item.__dict__.update(d) opname = "LOAD_ATTR_MODULE" self.assert_races_do_not_crash(opname, get_items, read, write) def test_load_attr_property(self): def get_items(): class C: a = property(lambda self: None) items = [] for _ in range(self.ITEMS): item = C() items.append(item) return items def read(items): for item in items: try: item.a except AttributeError: pass def write(items): for item in items: try: del type(item).a except AttributeError: pass type(item).a = property(lambda self: None) opname = "LOAD_ATTR_PROPERTY" self.assert_races_do_not_crash(opname, get_items, read, write) def test_load_attr_with_hint(self): def get_items(): class C: pass items = [] for _ in range(self.ITEMS): item = C() item.a = None # Resize into a combined unicode dict: for i in range(29): setattr(item, f"_{i}", None) items.append(item) return items def read(items): for item in items: item.a def write(items): for item in items: item.__dict__[None] = None opname = "LOAD_ATTR_WITH_HINT" self.assert_races_do_not_crash(opname, get_items, read, write) def test_load_global_module(self): def get_items(): items = [] for _ in range(self.ITEMS): item = eval("lambda: x", {"x": None}) items.append(item) return items def read(items): for item in items: item() def write(items): for item in items: item.__globals__[None] = None opname = "LOAD_GLOBAL_MODULE" self.assert_races_do_not_crash( opname, get_items, read, write, check_items=True ) def test_store_attr_instance_value(self): def get_items(): class C: pass items = [] for _ in range(self.ITEMS): item = C() items.append(item) return items def read(items): for item in items: item.a = None def write(items): for item in items: item.__dict__[None] = None opname = "STORE_ATTR_INSTANCE_VALUE" self.assert_races_do_not_crash(opname, get_items, read, write) def test_store_attr_with_hint(self): def get_items(): class C: pass items = [] for _ in range(self.ITEMS): item = C() # Resize into a combined unicode dict: for i in range(29): setattr(item, f"_{i}", None) items.append(item) return items def read(items): for item in items: item.a = None def write(items): for item in items: item.__dict__[None] = None opname = "STORE_ATTR_WITH_HINT" self.assert_races_do_not_crash(opname, get_items, read, write) def test_store_subscr_list_int(self): def get_items(): items = [] for _ in range(self.ITEMS): item = [None] items.append(item) return items def read(items): for item in items: try: item[0] = None except IndexError: pass def write(items): for item in items: item.clear() item.append(None) opname = "STORE_SUBSCR_LIST_INT" self.assert_races_do_not_crash(opname, get_items, read, write) def test_unpack_sequence_list(self): def get_items(): items = [] for _ in range(self.ITEMS): item = [None] items.append(item) return items def read(items): for item in items: try: [_] = item except ValueError: pass def write(items): for item in items: item.clear() item.append(None) opname = "UNPACK_SEQUENCE_LIST" self.assert_races_do_not_crash(opname, get_items, read, write) class C: pass @requires_specialization class TestInstanceDict(unittest.TestCase): def setUp(self): c = C() c.a, c.b, c.c = 0,0,0 def test_values_on_instance(self): c = C() c.a = 1 C().b = 2 c.c = 3 self.assertEqual( _testinternalcapi.get_object_dict_values(c), (1, '<NULL>', 3) ) def test_dict_materialization(self): c = C() c.a = 1 c.b = 2 c.__dict__ self.assertEqual(c.__dict__, {"a":1, "b": 2}) def test_dict_dematerialization(self): c = C() c.a = 1 c.b = 2 c.__dict__ for _ in range(100): c.a self.assertEqual( _testinternalcapi.get_object_dict_values(c), (1, 2, '<NULL>') ) def test_dict_dematerialization_multiple_refs(self): c = C() c.a = 1 c.b = 2 d = c.__dict__ for _ in range(100): c.a self.assertIs(c.__dict__, d) def test_dict_dematerialization_copy(self): c = C() c.a = 1 c.b = 2 c2 = copy.copy(c) for _ in range(100): c.a c2.a self.assertEqual( _testinternalcapi.get_object_dict_values(c), (1, 2, '<NULL>') ) self.assertEqual( _testinternalcapi.get_object_dict_values(c2), (1, 2, '<NULL>') ) c3 = copy.deepcopy(c) for _ in range(100): c.a c3.a self.assertEqual( _testinternalcapi.get_object_dict_values(c), (1, 2, '<NULL>') ) #NOTE -- c3.__dict__ does not de-materialize def test_dict_dematerialization_pickle(self): c = C() c.a = 1 c.b = 2 c2 = pickle.loads(pickle.dumps(c)) for _ in range(100): c.a c2.a self.assertEqual( _testinternalcapi.get_object_dict_values(c), (1, 2, '<NULL>') ) self.assertEqual( _testinternalcapi.get_object_dict_values(c2), (1, 2, '<NULL>') ) def test_dict_dematerialization_subclass(self): class D(dict): pass c = C() c.a = 1 c.b = 2 c.__dict__ = D(c.__dict__) for _ in range(100): c.a self.assertIs( _testinternalcapi.get_object_dict_values(c), None ) self.assertEqual( c.__dict__, {'a':1, 'b':2} ) def test_store_attr_with_hint(self): # gh-133441: Regression test for STORE_ATTR_WITH_HINT bytecode class Node: def __init__(self): self.parents = {} def __setstate__(self, data_dict): self.__dict__ = data_dict self.parents = {} class Dict(dict): pass obj = Node() obj.__setstate__({'parents': {}}) obj.__setstate__({'parents': {}}) obj.__setstate__(Dict({'parents': {}})) if __name__ == "__main__": unittest.main()