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[3.9] Revert "bpo-40170: PyType_HasFeature() now always calls PyType_GetFlags() (GH-19378)" (GH-21390) #21391

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Merged
merged 1 commit into from
Jul 8, 2020
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[3.9] Revert "bpo-40170: PyType_HasFeature() now always calls PyType_GetFlags() (GH-19378)" (GH-21390) #21391

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12 changes: 10 additions & 2 deletions Include/object.h
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Original file line number Diff line number Diff line change
Expand Up @@ -618,8 +618,16 @@ times.


static inline int
PyType_HasFeature(PyTypeObject *type, unsigned long feature) {
return ((PyType_GetFlags(type) & feature) != 0);
PyType_HasFeature(PyTypeObject *type, unsigned long feature)
{
unsigned long flags;
#ifdef Py_LIMITED_API
// PyTypeObject is opaque in the limited C API
flags = PyType_GetFlags(type);
#else
flags = type->tp_flags;
#endif
return ((flags & feature) != 0);
}

#define PyType_FastSubclass(type, flag) PyType_HasFeature(type, flag)
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4 changes: 4 additions & 0 deletions Misc/NEWS.d/next/C API/2020-07-08-10-14-52.bpo-40170.N6Qx1i.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
Revert :c:func:`PyType_HasFeature` change: it reads again directly the
:c:member:`PyTypeObject.tp_flags` member when the limited C API is not used,
rather than always calling :c:func:`PyType_GetFlags` which hides implementation
details.