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gh-115754: Add Py_GetConstant() function (#116883)

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Add Py_GetConstant() and Py_GetConstantBorrowed() functions.

In the limited C API version 3.13, getting Py_None, Py_False,
Py_True, Py_Ellipsis and Py_NotImplemented singletons is now
implemented as function calls at the stable ABI level to hide
implementation details. Getting these constants still return borrowed
references.

Add _testlimitedcapi/object.c and test_capi/test_object.py to test
Py_GetConstant() and Py_GetConstantBorrowed() functions.
This commit is contained in:
Victor Stinner 2024-03-21 17:07:00 +01:00 • committed by GitHub
parent 5a76d1be8e
commit 8bea6c411d
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22 changed files with 312 additions and 6 deletions
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9
Include/boolobject.h
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@ -18,8 +18,13 @@ PyAPI_DATA(PyLongObject) _Py_FalseStruct;
PyAPI_DATA(PyLongObject) _Py_TrueStruct;
/* Use these macros */
#define Py_False _PyObject_CAST(&_Py_FalseStruct)
#define Py_True _PyObject_CAST(&_Py_TrueStruct)
#if defined(Py_LIMITED_API) && Py_LIMITED_API+0 >= 0x030D0000
# define Py_False Py_GetConstantBorrowed(Py_CONSTANT_FALSE)
# define Py_True Py_GetConstantBorrowed(Py_CONSTANT_TRUE)
#else
# define Py_False _PyObject_CAST(&_Py_FalseStruct)
# define Py_True _PyObject_CAST(&_Py_TrueStruct)
#endif
// Test if an object is the True singleton, the same as "x is True" in Python.
PyAPI_FUNC(int) Py_IsTrue(PyObject *x);