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gh-103509: PEP 697 -- Limited C API for Extending Opaque Types (GH-103511)

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Co-authored-by: Oleg Iarygin <oleg@arhadthedev.net>
Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>
This commit is contained in:
Petr Viktorin 2023-05-04 09:56:53 +02:00 • committed by GitHub
parent 35d273825a
commit cd9a56c2b0
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30 changed files with 970 additions and 19 deletions
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1
Include/cpython/object.h
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@ -553,6 +553,7 @@ Py_DEPRECATED(3.11) typedef int UsingDeprecatedTrashcanMacro;
Py_TRASHCAN_END; \
} while(0);
PyAPI_FUNC(void *) PyObject_GetItemData(PyObject *obj);
PyAPI_FUNC(int) _PyObject_VisitManagedDict(PyObject *obj, visitproc visit, void *arg);
PyAPI_FUNC(void) _PyObject_ClearManagedDict(PyObject *obj);

1
Include/descrobject.h
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@ -83,6 +83,7 @@ struct PyMemberDef {
#define Py_READONLY 1
#define Py_AUDIT_READ 2 // Added in 3.10, harmless no-op before that
#define _Py_WRITE_RESTRICTED 4 // Deprecated, no-op. Do not reuse the value.
#define Py_RELATIVE_OFFSET 8
PyAPI_FUNC(PyObject *) PyMember_GetOne(const char *, PyMemberDef *);
PyAPI_FUNC(int) PyMember_SetOne(char *, PyMemberDef *, PyObject *);

5
Include/internal/pycore_object.h
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@ -389,11 +389,6 @@ extern PyObject ** _PyObject_ComputedDictPointer(PyObject *);
extern void _PyObject_FreeInstanceAttributes(PyObject *obj);
extern int _PyObject_IsInstanceDictEmpty(PyObject *);
// Access macro to the members which are floating "behind" the object
static inline PyMemberDef* _PyHeapType_GET_MEMBERS(PyHeapTypeObject *etype) {
return (PyMemberDef*)((char*)etype + Py_TYPE(etype)->tp_basicsize);
}
PyAPI_FUNC(PyObject *) _PyObject_LookupSpecial(PyObject *, PyObject *);
/* C function call trampolines to mitigate bad function pointer casts.

5
Include/object.h
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@ -355,6 +355,8 @@ PyAPI_FUNC(PyObject *) PyType_GetQualName(PyTypeObject *);
#endif
#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x030C0000
PyAPI_FUNC(PyObject *) PyType_FromMetaclass(PyTypeObject*, PyObject*, PyType_Spec*, PyObject*);
PyAPI_FUNC(void *) PyObject_GetTypeData(PyObject *obj, PyTypeObject *cls);
PyAPI_FUNC(Py_ssize_t) PyType_GetTypeDataSize(PyTypeObject *cls);
#endif
/* Generic type check */
@ -521,6 +523,9 @@ given type object has a specified feature.
// subject itself (rather than a mapped attribute on it):
#define _Py_TPFLAGS_MATCH_SELF (1UL << 22)
/* Items (ob_size*tp_itemsize) are found at the end of an instance's memory */
#define Py_TPFLAGS_ITEMS_AT_END (1UL << 23)
/* These flags are used to determine if a type is a subclass. */
#define Py_TPFLAGS_LONG_SUBCLASS (1UL << 24)
#define Py_TPFLAGS_LIST_SUBCLASS (1UL << 25)

11
Include/pyport.h
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@ -765,4 +765,15 @@ extern char * _getpty(int *, int, mode_t, int);
#undef __bool__
#endif
// Make sure we have maximum alignment, even if the current compiler
// does not support max_align_t. Note that:
// - Autoconf reports alignment of unknown types to 0.
// - 'long double' has maximum alignment on *most* platforms,
// looks like the best we can do for pre-C11 compilers.
// - The value is tested, see test_alignof_max_align_t
#if !defined(ALIGNOF_MAX_ALIGN_T) || ALIGNOF_MAX_ALIGN_T == 0
# undef ALIGNOF_MAX_ALIGN_T
# define ALIGNOF_MAX_ALIGN_T _Alignof(long double)
#endif
#endif /* Py_PYPORT_H */