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bpo-40521: Optimize PyBytes_FromStringAndSize(str, 0) (GH-21142)

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Always create the empty bytes string singleton.

Optimize PyBytes_FromStringAndSize(str, 0): it no longer has to check
if the empty string singleton was created or not, it is always
available.

Add functions:

* _PyBytes_Init()
* bytes_get_empty(), bytes_new_empty()
* bytes_create_empty_string_singleton()
* unicode_create_empty_string_singleton()

_Py_unicode_state: rename empty structure member to empty_string.
This commit is contained in:
Victor Stinner 2020-06-25 14:07:40 +02:00 • committed by GitHub
parent 0f8ec1fff0
commit 91698d8caa
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5 changed files with 107 additions and 53 deletions
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Include/internal/pycore_pylifecycle.h
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@ -32,6 +32,7 @@ PyAPI_FUNC(int) _Py_IsLocaleCoercionTarget(const char *ctype_loc);
/* Various one-time initializers */
extern PyStatus _PyUnicode_Init(PyThreadState *tstate);
extern PyStatus _PyBytes_Init(PyThreadState *tstate);
extern int _PyStructSequence_Init(void);
extern int _PyLong_Init(PyThreadState *tstate);
extern PyStatus _PyTuple_Init(PyThreadState *tstate);