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69 lines
2.2 KiB
ReStructuredText
69 lines
2.2 KiB
ReStructuredText
The Python C API
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================
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The C API is divided into three sections:
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1. ``Include/``
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2. ``Include/cpython/``
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3. ``Include/internal/``
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Include: Limited API
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====================
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``Include/``, excluding the ``cpython`` and ``internal`` subdirectories,
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contains the public Limited API (Application Programming Interface).
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The Limited API is a subset of the C API, designed to guarantee ABI
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stability across Python 3 versions, and is defined in :pep:`384`.
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Guidelines for expanding the Limited API:
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- Functions *must not* steal references
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- Functions *must not* return borrowed references
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- Functions returning references *must* return a strong reference
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- Macros should not expose implementation details
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- Please start a public discussion before expanding the API
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- Functions or macros with a ``_Py`` prefix do not belong in ``Include/``.
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It is possible to add a function or macro to the Limited API from a
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given Python version. For example, to add a function to the Limited API
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from Python 3.10 and onwards, wrap it with
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``#if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x030A0000``.
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Include/cpython: CPython implementation details
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===============================================
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``Include/cpython/`` contains the public API that is excluded from the
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Limited API and the Stable ABI.
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Guidelines for expanding the public API:
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- Functions *must not* steal references
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- Functions *must not* return borrowed references
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- Functions returning references *must* return a strong reference
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Include/internal: The internal API
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==================================
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With PyAPI_FUNC or PyAPI_DATA
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-----------------------------
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Functions or structures in ``Include/internal/`` defined with
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``PyAPI_FUNC`` or ``PyAPI_DATA`` are internal functions which are
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exposed only for specific use cases like debuggers and profilers.
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With the extern keyword
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-----------------------
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Functions in ``Include/internal/`` defined with the ``extern`` keyword
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*must not and can not* be used outside the CPython code base. Only
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built-in stdlib extensions (built with the ``Py_BUILD_CORE_BUILTIN``
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macro defined) can use such functions.
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When in doubt, new internal C functions should be defined in
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``Include/internal`` using the ``extern`` keyword.
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