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gh-127773: Disable attribute cache on incompatible MRO entries (GH-127924)

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Petr Viktorin 2025-01-13 14:10:41 +01:00 • committed by GitHub
parent 76ffaef729
commit aa6579cb60
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4 changed files with 50 additions and 2 deletions
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Include/cpython/object.h
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@ -221,7 +221,9 @@ struct _typeobject {
PyObject *tp_weaklist; /* not used for static builtin types */
destructor tp_del;
/* Type attribute cache version tag. Added in version 2.6 */
/* Type attribute cache version tag. Added in version 2.6.
* If zero, the cache is invalid and must be initialized.
*/
unsigned int tp_version_tag;
destructor tp_finalize;
@ -229,9 +231,17 @@ struct _typeobject {
/* bitset of which type-watchers care about this type */
unsigned char tp_watched;
/* Number of tp_version_tag values used.
* Set to _Py_ATTR_CACHE_UNUSED if the attribute cache is
* disabled for this type (e.g. due to custom MRO entries).
* Otherwise, limited to MAX_VERSIONS_PER_CLASS (defined elsewhere).
*/
uint16_t tp_versions_used;
};
#define _Py_ATTR_CACHE_UNUSED (30000) // (see tp_versions_used)
/* This struct is used by the specializer
* It should be treated as an opaque blob
* by code other than the specializer and interpreter. */