GH-101578: Normalize the current exception (GH-101607)

* Make sure that the current exception is always normalized.

* Remove redundant type and traceback fields for the current exception.

* Add new API functions: PyErr_GetRaisedException, PyErr_SetRaisedException

* Add new API functions: PyException_GetArgs, PyException_SetArgs

1 files changed, 6 insertions, 6 deletions

diff --git a/Objects/object.c b/Objects/object.c
index e940222..7817c04 100644
--- a/Objects/object.c
+++ b/Objects/object.c
@@ -2416,10 +2416,10 @@ _Py_Dealloc(PyObject *op)
     destructor dealloc = type->tp_dealloc;
 #ifdef Py_DEBUG
     PyThreadState *tstate = _PyThreadState_GET();
-    PyObject *old_exc_type = tstate != NULL ? tstate->curexc_type : NULL;
+    PyObject *old_exc = tstate != NULL ? tstate->current_exception : NULL;
     // Keep the old exception type alive to prevent undefined behavior
     // on (tstate->curexc_type != old_exc_type) below
-    Py_XINCREF(old_exc_type);
+    Py_XINCREF(old_exc);
     // Make sure that type->tp_name remains valid
     Py_INCREF(type);
 #endif
@@ -2432,12 +2432,12 @@ _Py_Dealloc(PyObject *op)
 #ifdef Py_DEBUG
     // gh-89373: The tp_dealloc function must leave the current exception
     // unchanged.
-    if (tstate != NULL && tstate->curexc_type != old_exc_type) {
+    if (tstate != NULL && tstate->current_exception != old_exc) {
         const char *err;
-        if (old_exc_type == NULL) {
+        if (old_exc == NULL) {
             err = "Deallocator of type '%s' raised an exception";
         }
-        else if (tstate->curexc_type == NULL) {
+        else if (tstate->current_exception == NULL) {
             err = "Deallocator of type '%s' cleared the current exception";
         }
         else {
@@ -2448,7 +2448,7 @@ _Py_Dealloc(PyObject *op)
         }
         _Py_FatalErrorFormat(__func__, err, type->tp_name);
     }
-    Py_XDECREF(old_exc_type);
+    Py_XDECREF(old_exc);
     Py_DECREF(type);
 #endif
 }