bpo-40268: Add _PyInterpreterState_GetConfig() (GH-19492)

Don't access PyInterpreterState.config member directly anymore, but
use new functions:

* _PyInterpreterState_GetConfig()
* _PyInterpreterState_SetConfig()
* _Py_GetConfig()

3 files changed, 4 insertions, 5 deletions

diff --git a/Modules/_io/_iomodule.c b/Modules/_io/_iomodule.c
index e880992..571f225 100644
--- a/Modules/_io/_iomodule.c
+++ b/Modules/_io/_iomodule.c
@@ -9,7 +9,6 @@
 
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
-#include "pycore_pystate.h"   /* _PyInterpreterState_GET_UNSAFE() */
 #include "structmember.h"
 #include "_iomodule.h"
 
@@ -377,7 +376,7 @@ _io_open_impl(PyObject *module, PyObject *file, const char *mode,
     {
         PyObject *RawIO_class = (PyObject *)&PyFileIO_Type;
 #ifdef MS_WINDOWS
-        PyConfig *config = &_PyInterpreterState_GET_UNSAFE()->config;
+        const PyConfig *config = _Py_GetConfig();
         if (!config->legacy_windows_stdio && _PyIO_get_console_type(path_or_fd) != '\0') {
             RawIO_class = (PyObject *)&PyWindowsConsoleIO_Type;
             encoding = "utf-8";
diff --git a/Modules/_io/iobase.c b/Modules/_io/iobase.c
index 1ff3564..924ffb5 100644
--- a/Modules/_io/iobase.c
+++ b/Modules/_io/iobase.c
@@ -287,8 +287,7 @@ iobase_finalize(PyObject *self)
            shutdown issues). */
         if (res == NULL) {
 #ifndef Py_DEBUG
-            const PyConfig *config = &_PyInterpreterState_GET_UNSAFE()->config;
-            if (config->dev_mode) {
+            if (_Py_GetConfig()->dev_mode) {
                 PyErr_WriteUnraisable(self);
             }
             else {
diff --git a/Modules/_io/textio.c b/Modules/_io/textio.c
index 92d6faa..492988e 100644
--- a/Modules/_io/textio.c
+++ b/Modules/_io/textio.c
@@ -9,6 +9,7 @@
 #define PY_SSIZE_T_CLEAN
 #include "Python.h"
 #include "pycore_object.h"
+#include "pycore_pystate.h"
 #include "structmember.h"
 #include "_iomodule.h"
 
@@ -996,7 +997,7 @@ io_check_errors(PyObject *errors)
     PyInterpreterState *interp = _PyInterpreterState_GET_UNSAFE();
 #ifndef Py_DEBUG
     /* In release mode, only check in development mode (-X dev) */
-    if (!interp->config.dev_mode) {
+    if (!_PyInterpreterState_GetConfig(interp)->dev_mode) {
         return 0;
     }
 #else