Preserve the stable ABI when creating fallback frame names

Author: pablogsal

Include/internal/pycore_global_objects_fini_generated.h

@@ -54,9 +54,6 @@ struct _Py_global_strings {
         STRUCT_FOR_STR(native, "<native>")
         STRUCT_FOR_STR(str_replace_inf, "1e309")
         STRUCT_FOR_STR(type_params, ".type_params")
-        STRUCT_FOR_STR(unknown_file, "<unknown file>")
-        STRUCT_FOR_STR(unknown_function, "<unknown function>")
-        STRUCT_FOR_STR(unreadable_frame, "<unreadable frame>")
         STRUCT_FOR_STR(utf_8, "utf-8")
     } literals;
 

Include/internal/pycore_global_strings.h

@@ -341,10 +341,6 @@ parse_code_object(RemoteUnwinderObject *unwinder,
                   PyObject **result,
                   const CodeObjectContext *ctx)
 {
-    _Py_DECLARE_STR(unknown_function, "<unknown function>");
-    _Py_DECLARE_STR(unknown_file, "<unknown file>");
-    _Py_DECLARE_STR(unreadable_frame, "<unreadable frame>");
-
     void *key = (void *)ctx->code_addr;
     CachedCodeMetadata *meta = NULL;
     PyObject *func = NULL;
@@ -378,7 +374,10 @@ parse_code_object(RemoteUnwinderObject *unwinder,
                 goto error;
             }
             PyErr_Clear();
-            func = Py_NewRef(&_Py_STR(unreadable_frame));
+            func = PyUnicode_FromString("<unreadable frame>");
+            if (!func) {
+                goto error;
+            }
             file = Py_NewRef(_Py_LATIN1_CHR('~'));
             goto degraded;
         }
@@ -390,7 +389,10 @@ parse_code_object(RemoteUnwinderObject *unwinder,
                 goto error;
             }
             PyErr_Clear();
-            func = Py_NewRef(&_Py_STR(unknown_function));
+            func = PyUnicode_FromString("<unknown function>");
+            if (!func) {
+                goto error;
+            }
             code_metadata_incomplete = 1;
         }
 
@@ -401,7 +403,10 @@ parse_code_object(RemoteUnwinderObject *unwinder,
                 goto error;
             }
             PyErr_Clear();
-            file = Py_NewRef(&_Py_STR(unknown_file));
+            file = PyUnicode_FromString("<unknown file>");
+            if (!file) {
+                goto error;
+            }
             code_metadata_incomplete = 1;
         }