https://github.com/python/cpython/commit/92337f666e8a076a68305a8d6dc8bc9c095000e9
commit: 92337f666e8a076a68305a8d6dc8bc9c095000e9
branch: main
author: Inada Naoki <songofaca...@gmail.com>
committer: methane <songofaca...@gmail.com>
date: 2025-05-11T14:44:21+09:00
summary:
gh-133703: dict: fix calculate_log2_keysize() (GH-133809)
files:
A
Misc/NEWS.d/next/Core_and_Builtins/2025-05-10-17-12-27.gh-issue-133703.bVM-re.rst
M Lib/test/test_dict.py
M Objects/dictobject.c
diff --git a/Lib/test/test_dict.py b/Lib/test/test_dict.py
index 69f1a098920b94..10a6d071b0f50b 100644
--- a/Lib/test/test_dict.py
+++ b/Lib/test/test_dict.py
@@ -1039,10 +1039,8 @@ class C:
a = C()
a.x = 1
d = a.__dict__
- before_resize = sys.getsizeof(d)
d[2] = 2 # split table is resized to a generic combined table
- self.assertGreater(sys.getsizeof(d), before_resize)
self.assertEqual(list(d), ['x', 2])
def test_iterator_pickling(self):
diff --git
a/Misc/NEWS.d/next/Core_and_Builtins/2025-05-10-17-12-27.gh-issue-133703.bVM-re.rst
b/Misc/NEWS.d/next/Core_and_Builtins/2025-05-10-17-12-27.gh-issue-133703.bVM-re.rst
new file mode 100644
index 00000000000000..05bf6103314a74
--- /dev/null
+++
b/Misc/NEWS.d/next/Core_and_Builtins/2025-05-10-17-12-27.gh-issue-133703.bVM-re.rst
@@ -0,0 +1 @@
+Fix hashtable in dict can be bigger than intended in some situations.
diff --git a/Objects/dictobject.c b/Objects/dictobject.c
index 32356f0634db15..ce27e47dabf3b0 100644
--- a/Objects/dictobject.c
+++ b/Objects/dictobject.c
@@ -547,13 +547,13 @@ static inline uint8_t
calculate_log2_keysize(Py_ssize_t minsize)
{
#if SIZEOF_LONG == SIZEOF_SIZE_T
- minsize = (minsize | PyDict_MINSIZE) - 1;
- return _Py_bit_length(minsize | (PyDict_MINSIZE-1));
+ minsize = Py_MAX(minsize, PyDict_MINSIZE);
+ return _Py_bit_length(minsize - 1);
#elif defined(_MSC_VER)
- // On 64bit Windows, sizeof(long) == 4.
- minsize = (minsize | PyDict_MINSIZE) - 1;
+ // On 64bit Windows, sizeof(long) == 4. We cannot use _Py_bit_length.
+ minsize = Py_MAX(minsize, PyDict_MINSIZE);
unsigned long msb;
- _BitScanReverse64(&msb, (uint64_t)minsize);
+ _BitScanReverse64(&msb, (uint64_t)minsize - 1);
return (uint8_t)(msb + 1);
#else
uint8_t log2_size;
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