gh-101819: Prepare to modernize the _io extension (#104178)

* Add references to static types to _PyIO_State:

  * PyBufferedIOBase_Type
  * PyBytesIOBuffer_Type
  * PyIncrementalNewlineDecoder_Type
  * PyRawIOBase_Type
  * PyTextIOBase_Type

* Add the defining class to methods:

  * _io.BytesIO.getbuffer()
  * _io.FileIO.close()

* Add get_io_state_by_cls() function.
* Add state parameter to _textiowrapper_decode()
* _io_TextIOWrapper___init__() now sets self->state before calling
  _textiowrapper_set_decoder().

Co-authored-by: Erlend E. Aasland <erlend.aasland@protonmail.com>

2 files changed, 18 insertions, 10 deletions

diff --git a/Modules/_io/clinic/bytesio.c.h b/Modules/_io/clinic/bytesio.c.h
index 84b58db..9550c87 100644
--- a/Modules/_io/clinic/bytesio.c.h
+++ b/Modules/_io/clinic/bytesio.c.h
@@ -87,15 +87,19 @@ PyDoc_STRVAR(_io_BytesIO_getbuffer__doc__,
 "Get a read-write view over the contents of the BytesIO object.");
 
 #define _IO_BYTESIO_GETBUFFER_METHODDEF    \
-    {"getbuffer", (PyCFunction)_io_BytesIO_getbuffer, METH_NOARGS, _io_BytesIO_getbuffer__doc__},
+    {"getbuffer", _PyCFunction_CAST(_io_BytesIO_getbuffer), METH_METHOD|METH_FASTCALL|METH_KEYWORDS, _io_BytesIO_getbuffer__doc__},
 
 static PyObject *
-_io_BytesIO_getbuffer_impl(bytesio *self);
+_io_BytesIO_getbuffer_impl(bytesio *self, PyTypeObject *cls);
 
 static PyObject *
-_io_BytesIO_getbuffer(bytesio *self, PyObject *Py_UNUSED(ignored))
+_io_BytesIO_getbuffer(bytesio *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
-    return _io_BytesIO_getbuffer_impl(self);
+    if (nargs) {
+        PyErr_SetString(PyExc_TypeError, "getbuffer() takes no arguments");
+        return NULL;
+    }
+    return _io_BytesIO_getbuffer_impl(self, cls);
 }
 
 PyDoc_STRVAR(_io_BytesIO_getvalue__doc__,
@@ -534,4 +538,4 @@ skip_optional_pos:
 exit:
     return return_value;
 }
-/*[clinic end generated code: output=a44770efbaeb80dd input=a9049054013a1b77]*/
+/*[clinic end generated code: output=098584d485420b65 input=a9049054013a1b77]*/
diff --git a/Modules/_io/clinic/fileio.c.h b/Modules/_io/clinic/fileio.c.h
index b6e9bd5..dfad8a5 100644
--- a/Modules/_io/clinic/fileio.c.h
+++ b/Modules/_io/clinic/fileio.c.h
@@ -18,15 +18,19 @@ PyDoc_STRVAR(_io_FileIO_close__doc__,
 "called more than once without error.");
 
 #define _IO_FILEIO_CLOSE_METHODDEF    \
-    {"close", (PyCFunction)_io_FileIO_close, METH_NOARGS, _io_FileIO_close__doc__},
+    {"close", _PyCFunction_CAST(_io_FileIO_close), METH_METHOD|METH_FASTCALL|METH_KEYWORDS, _io_FileIO_close__doc__},
 
 static PyObject *
-_io_FileIO_close_impl(fileio *self);
+_io_FileIO_close_impl(fileio *self, PyTypeObject *cls);
 
 static PyObject *
-_io_FileIO_close(fileio *self, PyObject *Py_UNUSED(ignored))
+_io_FileIO_close(fileio *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
 {
-    return _io_FileIO_close_impl(self);
+    if (nargs) {
+        PyErr_SetString(PyExc_TypeError, "close() takes no arguments");
+        return NULL;
+    }
+    return _io_FileIO_close_impl(self, cls);
 }
 
 PyDoc_STRVAR(_io_FileIO___init____doc__,
@@ -466,4 +470,4 @@ _io_FileIO_isatty(fileio *self, PyObject *Py_UNUSED(ignored))
 #ifndef _IO_FILEIO_TRUNCATE_METHODDEF
     #define _IO_FILEIO_TRUNCATE_METHODDEF
 #endif /* !defined(_IO_FILEIO_TRUNCATE_METHODDEF) */
-/*[clinic end generated code: output=27f883807a6c29ae input=a9049054013a1b77]*/
+/*[clinic end generated code: output=29ed2ae6c451c139 input=a9049054013a1b77]*/