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0518edc170
Use stringlib to specialize unicode_repr() for each string kind
(UCS1, UCS2, UCS4).
Benchmark:
+-------------------------------------+---------+----------------------+
| Benchmark | ref | change2 |
+=====================================+=========+======================+
| repr('abc') | 100 ns | 103 ns: 1.02x slower |
+-------------------------------------+---------+----------------------+
| repr('a' * 100) | 369 ns | 369 ns: 1.00x slower |
+-------------------------------------+---------+----------------------+
| repr(('a' + squote) * 100) | 1.21 us | 946 ns: 1.27x faster |
+-------------------------------------+---------+----------------------+
| repr(('a' + nl) * 100) | 1.23 us | 907 ns: 1.36x faster |
+-------------------------------------+---------+----------------------+
| repr(dquote + ('a' + squote) * 100) | 1.08 us | 858 ns: 1.25x faster |
+-------------------------------------+---------+----------------------+
| Geometric mean | (ref) | 1.16x faster |
+-------------------------------------+---------+----------------------+
bits shared by the bytesobject and unicodeobject implementations (and
possibly other modules, in a not too distant future).
the stuff in here is included into relevant places; see the individual
source files for details.
--------------------------------------------------------------------
the following defines used by the different modules:
STRINGLIB_CHAR
the type used to hold a character (char, Py_UCS1, Py_UCS2 or Py_UCS4)
STRINGLIB_GET_EMPTY()
returns a PyObject representing the empty string, only to be used if
STRINGLIB_MUTABLE is 0. It must not be NULL.
Py_ssize_t STRINGLIB_LEN(PyObject*)
returns the length of the given string object (which must be of the
right type)
PyObject* STRINGLIB_NEW(STRINGLIB_CHAR*, Py_ssize_t)
creates a new string object
STRINGLIB_CHAR* STRINGLIB_STR(PyObject*)
returns the pointer to the character data for the given string
object (which must be of the right type)
int STRINGLIB_CHECK_EXACT(PyObject *)
returns true if the object is an instance of our type, not a subclass
STRINGLIB_MUTABLE
must be 0 or 1 to tell the cpp macros in stringlib code if the object
being operated on is mutable or not