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gh-99845: PEP 670: Convert PyObject macros to functions (#99850)

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Convert macros to static inline functions to avoid macro pitfalls,
like duplication of side effects:

* _PyObject_SIZE()
* _PyObject_VAR_SIZE()

The result type is size_t (unsigned).
This commit is contained in:
Victor Stinner 2022-11-30 18:17:50 +01:00 committed by GitHub
parent 85dd6cb6df
commit 131801d14d
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1 changed files with 8 additions and 5 deletions
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13
Include/cpython/objimpl.h
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@ -2,7 +2,9 @@
# error "this header file must not be included directly"
#endif
#define _PyObject_SIZE(typeobj) ( (typeobj)->tp_basicsize )
static inline size_t _PyObject_SIZE(PyTypeObject *type) {
return _Py_STATIC_CAST(size_t, type->tp_basicsize);
}
/* _PyObject_VAR_SIZE returns the number of bytes (as size_t) allocated for a
vrbl-size object with nitems items, exclusive of gc overhead (if any). The
@ -18,10 +20,11 @@
# error "_PyObject_VAR_SIZE requires SIZEOF_VOID_P be a power of 2"
#endif
#define _PyObject_VAR_SIZE(typeobj, nitems) \
_Py_SIZE_ROUND_UP((typeobj)->tp_basicsize + \
(nitems)*(typeobj)->tp_itemsize, \
SIZEOF_VOID_P)
static inline size_t _PyObject_VAR_SIZE(PyTypeObject *type, Py_ssize_t nitems) {
size_t size = _Py_STATIC_CAST(size_t, type->tp_basicsize);
size += _Py_STATIC_CAST(size_t, nitems) * _Py_STATIC_CAST(size_t, type->tp_itemsize);
return _Py_SIZE_ROUND_UP(size, SIZEOF_VOID_P);
}
/* This example code implements an object constructor with a custom