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12af8ec864
Fix warnings when using -Wimplicit-fallthrough compiler flag. Annotate explicitly "fall through" switch cases with a new _Py_FALLTHROUGH macro which uses __attribute__((fallthrough)) if available. Replace "fall through" comments with _Py_FALLTHROUGH. Add _Py__has_attribute() macro. No longer define __has_attribute() macro if it's not defined. Move also _Py__has_builtin() at the top of pyport.h. Co-Authored-By: Nikita Sobolev <mail@sobolevn.me>
105 lines
4.4 KiB
C
105 lines
4.4 KiB
C
#ifndef Py_EXPORTS_H
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#define Py_EXPORTS_H
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/* Declarations for symbol visibility.
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PyAPI_FUNC(type): Declares a public Python API function and return type
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PyAPI_DATA(type): Declares public Python data and its type
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PyMODINIT_FUNC: A Python module init function. If these functions are
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inside the Python core, they are private to the core.
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If in an extension module, it may be declared with
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external linkage depending on the platform.
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As a number of platforms support/require "__declspec(dllimport/dllexport)",
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we support a HAVE_DECLSPEC_DLL macro to save duplication.
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*/
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/*
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All windows ports, except cygwin, are handled in PC/pyconfig.h.
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Cygwin is the only other autoconf platform requiring special
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linkage handling and it uses __declspec().
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*/
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#if defined(__CYGWIN__)
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# define HAVE_DECLSPEC_DLL
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#endif
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#if defined(_WIN32) || defined(__CYGWIN__)
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#if defined(Py_ENABLE_SHARED)
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#define Py_IMPORTED_SYMBOL __declspec(dllimport)
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#define Py_EXPORTED_SYMBOL __declspec(dllexport)
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#define Py_LOCAL_SYMBOL
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#else
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#define Py_IMPORTED_SYMBOL
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#define Py_EXPORTED_SYMBOL
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#define Py_LOCAL_SYMBOL
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#endif
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#else
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/*
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* If we only ever used gcc >= 5, we could use __has_attribute(visibility)
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* as a cross-platform way to determine if visibility is supported. However,
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* we may still need to support gcc >= 4, as some Ubuntu LTS and Centos versions
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* have 4 < gcc < 5.
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*/
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#if (defined(__GNUC__) && (__GNUC__ >= 4)) ||\
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(defined(__clang__) && _Py__has_attribute(visibility))
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#define Py_IMPORTED_SYMBOL __attribute__ ((visibility ("default")))
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#define Py_EXPORTED_SYMBOL __attribute__ ((visibility ("default")))
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#define Py_LOCAL_SYMBOL __attribute__ ((visibility ("hidden")))
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#else
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#define Py_IMPORTED_SYMBOL
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#define Py_EXPORTED_SYMBOL
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#define Py_LOCAL_SYMBOL
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#endif
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#endif
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/* only get special linkage if built as shared or platform is Cygwin */
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#if defined(Py_ENABLE_SHARED) || defined(__CYGWIN__)
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# if defined(HAVE_DECLSPEC_DLL)
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# if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
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# define PyAPI_FUNC(RTYPE) Py_EXPORTED_SYMBOL RTYPE
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# define PyAPI_DATA(RTYPE) extern Py_EXPORTED_SYMBOL RTYPE
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/* module init functions inside the core need no external linkage */
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/* except for Cygwin to handle embedding */
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# if defined(__CYGWIN__)
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# define PyMODINIT_FUNC Py_EXPORTED_SYMBOL PyObject*
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# else /* __CYGWIN__ */
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# define PyMODINIT_FUNC PyObject*
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# endif /* __CYGWIN__ */
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# else /* Py_BUILD_CORE */
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/* Building an extension module, or an embedded situation */
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/* public Python functions and data are imported */
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/* Under Cygwin, auto-import functions to prevent compilation */
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/* failures similar to those described at the bottom of 4.1: */
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/* http://docs.python.org/extending/windows.html#a-cookbook-approach */
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# if !defined(__CYGWIN__)
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# define PyAPI_FUNC(RTYPE) Py_IMPORTED_SYMBOL RTYPE
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# endif /* !__CYGWIN__ */
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# define PyAPI_DATA(RTYPE) extern Py_IMPORTED_SYMBOL RTYPE
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/* module init functions outside the core must be exported */
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# if defined(__cplusplus)
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# define PyMODINIT_FUNC extern "C" Py_EXPORTED_SYMBOL PyObject*
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# else /* __cplusplus */
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# define PyMODINIT_FUNC Py_EXPORTED_SYMBOL PyObject*
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# endif /* __cplusplus */
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# endif /* Py_BUILD_CORE */
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# endif /* HAVE_DECLSPEC_DLL */
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#endif /* Py_ENABLE_SHARED */
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/* If no external linkage macros defined by now, create defaults */
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#ifndef PyAPI_FUNC
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# define PyAPI_FUNC(RTYPE) Py_EXPORTED_SYMBOL RTYPE
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#endif
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#ifndef PyAPI_DATA
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# define PyAPI_DATA(RTYPE) extern Py_EXPORTED_SYMBOL RTYPE
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#endif
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#ifndef PyMODINIT_FUNC
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# if defined(__cplusplus)
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# define PyMODINIT_FUNC extern "C" Py_EXPORTED_SYMBOL PyObject*
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# else /* __cplusplus */
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# define PyMODINIT_FUNC Py_EXPORTED_SYMBOL PyObject*
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# endif /* __cplusplus */
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#endif
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#endif /* Py_EXPORTS_H */
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