bpo-45439: Move _PyObject_CallNoArgs() to pycore_call.h (GH-28895)

* Move _PyObject_CallNoArgs() to pycore_call.h (internal C API).
* _ssl, _sqlite and _testcapi extensions now call the public
  PyObject_CallNoArgs() function, rather than _PyObject_CallNoArgs().
* _lsprof extension is now built with Py_BUILD_CORE_MODULE macro
  defined to get access to internal _PyObject_CallNoArgs().

Author: vstinner

Include/cpython/abstract.h

@@ -160,15 +160,6 @@ _PyObject_FastCall(PyObject *func, PyObject *const *args, Py_ssize_t nargs)
     return _PyObject_FastCallTstate(tstate, func, args, nargs);
 }
 
-/* Call a callable without any arguments
-   Private static inline function variant of public function
-   PyObject_CallNoArgs(). */
-static inline PyObject *
-_PyObject_CallNoArgs(PyObject *func) {
-    PyThreadState *tstate = PyThreadState_Get();
-    return _PyObject_VectorcallTstate(tstate, func, NULL, 0, NULL);
-}
-
 static inline PyObject *
 PyObject_CallOneArg(PyObject *func, PyObject *arg)
 {

Include/internal/pycore_call.h

@@ -33,6 +33,13 @@ _PyObject_CallNoArgsTstate(PyThreadState *tstate, PyObject *func) {
     return _PyObject_VectorcallTstate(tstate, func, NULL, 0, NULL);
 }
 
+// Private static inline function variant of public PyObject_CallNoArgs()
+static inline PyObject *
+_PyObject_CallNoArgs(PyObject *func) {
+    PyThreadState *tstate = PyThreadState_Get();
+    return _PyObject_VectorcallTstate(tstate, func, NULL, 0, NULL);
+}
+
 #ifdef __cplusplus
 }
 #endif

Modules/_collectionsmodule.c

@@ -1,4 +1,5 @@
 #include "Python.h"
+#include "pycore_call.h"          // _PyObject_CallNoArgs()
 #include "pycore_long.h"          // _PyLong_GetZero()
 #include "structmember.h"         // PyMemberDef
 

Modules/_ctypes/_ctypes.c

@@ -102,6 +102,7 @@ bytes(cdata)
 #define PY_SSIZE_T_CLEAN
 
 #include "Python.h"
+#include "pycore_call.h"          // _PyObject_CallNoArgs()
 #include "structmember.h"         // PyMemberDef
 
 #include <ffi.h>

Modules/_ctypes/callbacks.c

@@ -1,4 +1,5 @@
 #include "Python.h"
+#include "pycore_call.h"          // _PyObject_CallNoArgs()
 #include "frameobject.h"
 
 #include <stdbool.h>

Modules/_ctypes/cfield.c

@@ -1,5 +1,6 @@
 #include "Python.h"
 #include "pycore_bitutils.h"      // _Py_bswap32()
+#include "pycore_call.h"          // _PyObject_CallNoArgs()
 
 #include <ffi.h>
 #ifdef MS_WIN32

Modules/_ctypes/stgdict.c

@@ -1,4 +1,5 @@
 #include "Python.h"
+#include "pycore_call.h"          // _PyObject_CallNoArgs()
 #include <ffi.h>
 #ifdef MS_WIN32
 #include <windows.h>

Modules/_functoolsmodule.c

@@ -1,4 +1,5 @@
 #include "Python.h"
+#include "pycore_call.h"          // _PyObject_CallNoArgs()
 #include "pycore_long.h"          // _PyLong_GetZero()
 #include "pycore_moduleobject.h"  // _PyModule_GetState()
 #include "pycore_object.h"        // _PyObject_GC_TRACK

Modules/_io/bufferedio.c

@@ -9,6 +9,7 @@
 
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
+#include "pycore_call.h"          // _PyObject_CallNoArgs()
 #include "pycore_object.h"
 #include "structmember.h"         // PyMemberDef
 #include "_iomodule.h"

Modules/_lsprof.c

@@ -1,4 +1,5 @@
 #include "Python.h"
+#include "pycore_call.h"          // _PyObject_CallNoArgs()
 #include "rotatingtree.h"
 
 /************************************************************/