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python-cpython/Include/pyabi.h at main · sthagen/python-cpython · GitHub
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/* Macros that restrict available definitions and select implementations
* to match an ABI stability promise:
*
* - internal API/ABI (may change at any time) -- Py_BUILD_CORE*
* - general CPython API/ABI (may change in 3.x.0) -- default
* - Stable ABI: abi3, abi3t (long-term stable) -- Py_LIMITED_API,
* Py_TARGET_ABI3T, _Py_OPAQUE_PYOBJECT
* - Free-threading (incompatible with non-free-threading builds)
* -- Py_GIL_DISABLED
*/
#ifndef
_Py_PYABI_H
#define
_Py_PYABI_H
/* Defines to build Python and its standard library:
*
* - Py_BUILD_CORE: Build Python core. Gives access to Python internals; should
* not be used by third-party modules.
* - Py_BUILD_CORE_BUILTIN: Build a Python stdlib module as a built-in module.
* - Py_BUILD_CORE_MODULE: Build a Python stdlib module as a dynamic library.
*
* Py_BUILD_CORE_BUILTIN and Py_BUILD_CORE_MODULE imply Py_BUILD_CORE.
*
* On Windows, Py_BUILD_CORE_MODULE exports "PyInit_xxx" symbol, whereas
* Py_BUILD_CORE_BUILTIN does not.
*/
#if
defined(
Py_BUILD_CORE_BUILTIN
)
&&
!defined(
Py_BUILD_CORE
)
# define
Py_BUILD_CORE
#endif
#if
defined(
Py_BUILD_CORE_MODULE
)
&&
!defined(
Py_BUILD_CORE
)
# define
Py_BUILD_CORE
#endif
/* Check valid values for target ABI macros.
*/
#if
defined(
Py_LIMITED_API
)
&&
Py_LIMITED_API
+
0
<
3
// Empty Py_LIMITED_API used to work; redefine to
// Python 3.2 to be explicit.
# undef
Py_LIMITED_API
# define
Py_LIMITED_API
0x03020000
#endif
#if
defined(
Py_TARGET_ABI3T
)
&&
Py_TARGET_ABI3T
+
0
<
0x030f0000
# error
"Py_TARGET_ABI3T must be 0x030f0000 (3.15) or above"
#endif
/* Stable ABI for free-threaded builds (abi3t, introduced in PEP 803)
* is enabled by one of:
* - Py_TARGET_ABI3T, or
* - Py_LIMITED_API and Py_GIL_DISABLED.
*
* These affect set the following, which Python.h should use internally:
* - Py_LIMITED_API (defines the subset of API we expose)
* - _Py_OPAQUE_PYOBJECT (additionally hides what's ABI-incompatible between
* free-threaded & GIL)
*
* (Don't use Py_TARGET_ABI3T directly. It's currently only used to set these
* 2 macros, and defined for users' convenience.)
*
* This logic is currently partially duplicated in PC/pyconfig.h.
*/
#if
defined(
Py_LIMITED_API
)
&&
defined(
Py_GIL_DISABLED
) \
&&
!defined(
Py_TARGET_ABI3T
)
# define
Py_TARGET_ABI3T
Py_LIMITED_API
#endif
#if
defined(
Py_TARGET_ABI3T
)
# define
_Py_OPAQUE_PYOBJECT
# if
!defined(
Py_LIMITED_API
)
# define
Py_LIMITED_API
Py_TARGET_ABI3T
# elif
Py_LIMITED_API
>
Py_TARGET_ABI3T
// if both are defined, use the *lower* version,
// i.e. maximum compatibility
# undef
Py_LIMITED_API
# define
Py_LIMITED_API
Py_TARGET_ABI3T
# endif
#else
# ifdef
_Py_OPAQUE_PYOBJECT
// _Py_OPAQUE_PYOBJECT is a private macro; do not define it directly.
# error
"Define Py_TARGET_ABI3T to target abi3t."
# endif
#endif
#if
defined(
Py_TARGET_ABI3T
)
# if
!defined(
Py_GIL_DISABLED
)
// Define Py_GIL_DISABLED for users' needs. Users check this macro to see
// whether they need extra synchronization.
# define
Py_GIL_DISABLED
# endif
# if
defined(
_Py_IS_TESTCEXT
)
// When compiling for abi3t, contents of Python.h should not depend
// on Py_GIL_DISABLED.
// We ask GCC to error if it sees the macro from this point on.
// Since users are free to the macro, and there's no way to undo the
// poisoning at the end of Python.h, we only do this in a test module
// (test_cext).
//
// Clang's poisoning is stricter than GCC's: it looks in `#elif`
// expressions after matching `#if`s. We disable it for now.
// We also provide an undocumented, unsupported opt-out macro to help
// porting to other compilers. Consider reaching out if you use it.
# if
defined(
__GNUC__
)
&&
!defined(
__clang__
)
&&
!defined(
_Py_NO_GCC_POISON
)
# undef
Py_GIL_DISABLED
# pragma
GCC poison Py_GIL_DISABLED
# endif
# endif
#endif
/* The internal C API must not be used with the limited C API: make sure
* that Py_BUILD_CORE* macros are not defined in this case.
* But, keep the "original" values, under different names, for "exports.h"
*/
#ifdef
Py_BUILD_CORE
# define
_PyEXPORTS_CORE
#endif
#ifdef
Py_BUILD_CORE_MODULE
# define
_PyEXPORTS_CORE_MODULE
#endif
#ifdef
Py_LIMITED_API
# undef
Py_BUILD_CORE
# undef
Py_BUILD_CORE_BUILTIN
# undef
Py_BUILD_CORE_MODULE
#endif
#endif
// _Py_PYABI_H
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