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gh-111506: Add _Py_OPAQUE_PYOBJECT to hide PyObject layout & related API (GH-136505)

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Allow Py_LIMITED_API for (Py_GIL_DISABLED && _Py_OPAQUE_PYOBJECT)


API that's removed when _Py_OPAQUE_PYOBJECT is defined:

    - PyObject_HEAD
    - _PyObject_EXTRA_INIT
    - PyObject_HEAD_INIT
    - PyObject_VAR_HEAD
    - struct _object (i.e. PyObject) (opaque)
    - struct PyVarObject (opaque)
    - Py_SIZE
    - Py_SET_TYPE
    - Py_SET_SIZE
    - PyModuleDef_Base (opaque)
    - PyModuleDef_HEAD_INIT
    - PyModuleDef (opaque)
    - _Py_IsImmortal
    - _Py_IsStaticImmortal

Note that the `_Py_IsImmortal` removal (and a few other issues)
 means _Py_OPAQUE_PYOBJECT only works with limited
API 3.14+ now.


Co-authored-by: Victor Stinner <vstinner@python.org>
This commit is contained in:
Petr Viktorin 2025-07-12 09:55:12 +02:00 • committed by GitHub
parent db47f4d844
commit c7d24b81c3
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8 changed files with 123 additions and 25 deletions
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22
Include/Python.h
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@ -45,19 +45,19 @@
# endif
#endif
// gh-111506: The free-threaded build is not compatible with the limited API
// or the stable ABI.
#if defined(Py_LIMITED_API) && defined(Py_GIL_DISABLED)
# error "The limited API is not currently supported in the free-threaded build"
#endif
#if defined(Py_GIL_DISABLED)
# if defined(Py_LIMITED_API) && !defined(_Py_OPAQUE_PYOBJECT)
# error "Py_LIMITED_API is not currently supported in the free-threaded build"
# endif
#if defined(Py_GIL_DISABLED) && defined(_MSC_VER)
# include <intrin.h> // __readgsqword()
#endif
# if defined(_MSC_VER)
# include <intrin.h> // __readgsqword()
# endif
#if defined(Py_GIL_DISABLED) && defined(__MINGW32__)
# include <intrin.h> // __readgsqword()
#endif
# if defined(__MINGW32__)
# include <intrin.h> // __readgsqword()
# endif
#endif // Py_GIL_DISABLED
// Include Python header files
#include "pyport.h"