gh-117953: Cleanups For fix_up_extension() in import.c (gh-118192)

These are cleanups I've pulled out of gh-118116.  Mostly, this change moves code around to align with some future changes and to improve clarity a little.  There is one very small change in behavior: we now add the module to the per-interpreter caches after updating the global state, rather than before.

1 files changed, 5 insertions, 0 deletions

diff --git a/Python/importdl.c b/Python/importdl.c
index 7cf30be..e512161 100644
--- a/Python/importdl.c
+++ b/Python/importdl.c
@@ -226,6 +226,11 @@ _PyImport_LoadDynamicModuleWithSpec(PyObject *spec, FILE *fp)
     }
     def->m_base.m_init = p0;
 
+    /* Remember the filename as the __file__ attribute */
+    if (PyModule_AddObjectRef(m, "__file__", filename) < 0) {
+        PyErr_Clear(); /* Not important enough to report */
+    }
+
     PyObject *modules = PyImport_GetModuleDict();
     if (_PyImport_FixupExtensionObject(m, name_unicode, filename, modules) < 0)
         goto error;