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GH-95245: Store object values and dict pointers in single tagged pointer. (GH-95278)

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Mark Shannon 2022-08-01 14:34:54 +01:00 • committed by GitHub
parent fb75d015f4
commit de388c0a7b
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10 changed files with 271 additions and 203 deletions
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43
Include/internal/pycore_object.h
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@ -274,24 +274,49 @@ extern int _PyObject_StoreInstanceAttribute(PyObject *obj, PyDictValues *values,
PyObject * _PyObject_GetInstanceAttribute(PyObject *obj, PyDictValues *values,
PyObject *name);
static inline PyDictValues **_PyObject_ValuesPointer(PyObject *obj)
typedef union {
PyObject *dict;
/* Use a char* to generate a warning if directly assigning a PyDictValues */
char *values;
} PyDictOrValues;
static inline PyDictOrValues *
_PyObject_DictOrValuesPointer(PyObject *obj)
{
assert(Py_TYPE(obj)->tp_flags & Py_TPFLAGS_MANAGED_DICT);
return ((PyDictValues **)obj)-4;
return ((PyDictOrValues *)obj)-3;
}
static inline PyObject **_PyObject_ManagedDictPointer(PyObject *obj)
static inline int
_PyDictOrValues_IsValues(PyDictOrValues dorv)
{
assert(Py_TYPE(obj)->tp_flags & Py_TPFLAGS_MANAGED_DICT);
return ((PyObject **)obj)-3;
return ((uintptr_t)dorv.values) & 1;
}
static inline PyDictValues *
_PyDictOrValues_GetValues(PyDictOrValues dorv)
{
assert(_PyDictOrValues_IsValues(dorv));
return (PyDictValues *)(dorv.values + 1);
}
static inline PyObject *
_PyDictOrValues_GetDict(PyDictOrValues dorv)
{
assert(!_PyDictOrValues_IsValues(dorv));
return dorv.dict;
}
static inline void
_PyDictOrValues_SetValues(PyDictOrValues *ptr, PyDictValues *values)
{
ptr->values = ((char *)values) - 1;
}
#define MANAGED_DICT_OFFSET (((int)sizeof(PyObject *))*-3)
extern PyObject ** _PyObject_DictPointer(PyObject *);
extern int _PyObject_VisitInstanceAttributes(PyObject *self, visitproc visit, void *arg);
extern void _PyObject_ClearInstanceAttributes(PyObject *self);
extern void _PyObject_FreeInstanceAttributes(PyObject *self);
extern PyObject ** _PyObject_ComputedDictPointer(PyObject *);
extern void _PyObject_FreeInstanceAttributes(PyObject *obj);
extern int _PyObject_IsInstanceDictEmpty(PyObject *);
extern PyObject* _PyType_GetSubclasses(PyTypeObject *);