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Optimize bytearray % args

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Issue #25399: Don't create temporary bytes objects: modify _PyBytes_Format() to
create work directly on bytearray objects.

* Rename _PyBytes_Format() to _PyBytes_FormatEx() just in case if something
  outside CPython uses it
* _PyBytes_FormatEx() now uses (char*, Py_ssize_t) for the input string, so
  bytearray_format() doesn't need tot create a temporary input bytes object
* Add use_bytearray parameter to _PyBytes_FormatEx() which is passed to
  _PyBytesWriter, to create a bytearray buffer instead of a bytes buffer

Most formatting operations are now between 2.5 and 5 times faster.
This commit is contained in:
Victor Stinner 2015-10-14 09:56:53 +02:00
parent 661aaccf9d
commit 772b2b09f2
3 changed files with 33 additions and 36 deletions
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6
Include/bytesobject.h
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@ -62,7 +62,11 @@ PyAPI_FUNC(void) PyBytes_Concat(PyObject **, PyObject *);
PyAPI_FUNC(void) PyBytes_ConcatAndDel(PyObject **, PyObject *);
#ifndef Py_LIMITED_API
PyAPI_FUNC(int) _PyBytes_Resize(PyObject **, Py_ssize_t);
PyAPI_FUNC(PyObject *) _PyBytes_Format(PyObject *, PyObject *);
PyAPI_FUNC(PyObject*) _PyBytes_FormatEx(
const char *format,
Py_ssize_t format_len,
PyObject *args,
int use_bytearray);
#endif
PyAPI_FUNC(PyObject *) PyBytes_DecodeEscape(const char *, Py_ssize_t,
const char *, Py_ssize_t,