Add _PyImport_GetModuleDict().

Include/import.h

@@ -38,6 +38,9 @@ PyAPI_FUNC(PyObject *) PyImport_ExecCodeModuleObject(
     );
 #endif
 PyAPI_FUNC(PyObject *) PyImport_GetModuleDict(void);
+#ifndef Py_LIMITED_API
+PyAPI_FUNC(PyObject *) _PyImport_GetModuleDict(PyThreadState *tstate);
+#endif
 #if !defined(Py_LIMITED_API) || Py_LIMITED_API+0 >= 0x03030000
 PyAPI_FUNC(PyObject *) PyImport_AddModuleObject(
     PyObject *name

Python/import.c

@@ -300,13 +300,24 @@ _PyImport_Fini(void)
 
 /* Helper for sys */
 
+PyObject *
+_PyImport_GetModuleDict(PyThreadState *tstate)
+{
+    if (tstate->interp->sysdict == NULL)
+        Py_FatalError("_PyImport_GetModuleDict: no sys module!");
+
+    _Py_IDENTIFIER(modules);
+    PyObject *modules = _PyDict_GetItemId(tstate->interp->sysdict,
+                                          &PyId_modules);
+    if (modules == NULL)
+        Py_FatalError("lost sys.modules");
+    return modules;
+}
+
 PyObject *
 PyImport_GetModuleDict(void)
 {
-    PyInterpreterState *interp = PyThreadState_GET()->interp;
-    if (interp->modules == NULL)
-        Py_FatalError("PyImport_GetModuleDict: no module dictionary!");
-    return interp->modules;
+    return _PyImport_GetModuleDict(PyThreadState_GET());
 }