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GH-101291: Rearrange the size bits in PyLongObject (GH-102464)

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* Eliminate all remaining uses of Py_SIZE and Py_SET_SIZE on PyLongObject, adding asserts.

* Change layout of size/sign bits in longobject to support future addition of immortal ints and tagged medium ints.

* Add functions to hide some internals of long object, and for setting sign and digit count.

* Replace uses of IS_MEDIUM_VALUE macro with _PyLong_IsCompact().
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Mark Shannon 2023-03-22 14:49:51 +00:00 • committed by GitHub
parent 713df2c534
commit 7559f5fda9
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25 changed files with 982 additions and 898 deletions
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8
Include/object.h
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@ -138,8 +138,13 @@ static inline PyTypeObject* Py_TYPE(PyObject *ob) {
# define Py_TYPE(ob) Py_TYPE(_PyObject_CAST(ob))
#endif
PyAPI_DATA(PyTypeObject) PyLong_Type;
PyAPI_DATA(PyTypeObject) PyBool_Type;
// bpo-39573: The Py_SET_SIZE() function must be used to set an object size.
static inline Py_ssize_t Py_SIZE(PyObject *ob) {
assert(ob->ob_type != &PyLong_Type);
assert(ob->ob_type != &PyBool_Type);
PyVarObject *var_ob = _PyVarObject_CAST(ob);
return var_ob->ob_size;
}
@ -171,8 +176,9 @@ static inline void Py_SET_TYPE(PyObject *ob, PyTypeObject *type) {
# define Py_SET_TYPE(ob, type) Py_SET_TYPE(_PyObject_CAST(ob), type)
#endif
static inline void Py_SET_SIZE(PyVarObject *ob, Py_ssize_t size) {
assert(ob->ob_base.ob_type != &PyLong_Type);
assert(ob->ob_base.ob_type != &PyBool_Type);
ob->ob_size = size;
}
#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 < 0x030b0000