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bpo-38140: Make dict and weakref offsets opaque for C heap types (#16076)

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* Make dict and weakref offsets opaque for C heap types

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This commit is contained in:
Eddie Elizondo 2019-09-19 09:29:05 -07:00 • committed by Dino Viehland
parent 079931d122
commit 3368f3c6ae
8 changed files with 188 additions and 8 deletions
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27
Lib/test/test_capi.py
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@ -12,6 +12,7 @@ import textwrap
import threading
import time
import unittest
import weakref
from test import support
from test.support import MISSING_C_DOCSTRINGS
from test.support.script_helper import assert_python_failure, assert_python_ok
@ -437,6 +438,32 @@ class CAPITest(unittest.TestCase):
# 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_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_c_subclass_of_heap_ctype_with_tpdealloc_decrefs_once(self):
subclass_instance = _testcapi.HeapCTypeSubclass()
type_refcnt = sys.getrefcount(_testcapi.HeapCTypeSubclass)