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bpo-40521: Always create the empty tuple singleton (GH-21116)

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Py_InitializeFromConfig() now always creates the empty tuple
singleton as soon as possible.

Optimize PyTuple_New(0): it no longer has to check if the empty tuple
was created or not, it is always creatd.

* Add tuple_create_empty_tuple_singleton() function.
* Add tuple_get_empty() function.
* Remove state parameter of tuple_alloc().
This commit is contained in:
Victor Stinner 2020-06-24 15:21:54 +02:00 • committed by GitHub
parent 80526f6841
commit 0430dfac62
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3 changed files with 105 additions and 49 deletions
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Include/internal/pycore_pylifecycle.h
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@ -34,6 +34,7 @@ PyAPI_FUNC(int) _Py_IsLocaleCoercionTarget(const char *ctype_loc);
extern PyStatus _PyUnicode_Init(PyThreadState *tstate);
extern int _PyStructSequence_Init(void);
extern int _PyLong_Init(PyThreadState *tstate);
extern PyStatus _PyTuple_Init(PyThreadState *tstate);
extern PyStatus _PyFaulthandler_Init(int enable);
extern int _PyTraceMalloc_Init(int enable);
extern PyObject * _PyBuiltin_Init(PyThreadState *tstate);