Issue #6697: _lsprof: normalizeUserObj() doesn't encode/decode (UTF-8) the

module name anymore, only work on unicode strings. Therefore it doesn't
truncate module names with embedded NUL characters, or fail if the module name
contains surrogate characters (UTF-8 encoder fails on a surrogate character).

Patch written by Alexander Belopolsky.

Modules/_lsprof.c

@@ -176,36 +176,29 @@ normalizeUserObj(PyObject *obj)
     if (fn->m_self == NULL) {
         /* built-in function: look up the module name */
         PyObject *mod = fn->m_module;
-        const char *modname;
-        if (mod && PyUnicode_Check(mod)) {
-            /* XXX: The following will truncate module names with embedded
-             * null-characters.  It is unlikely that this can happen in
-             * practice and the concequences are not serious enough to
-             * introduce extra checks here.
-             */
-            modname = _PyUnicode_AsString(mod);
-            if (modname == NULL) {
-                modname = "<encoding error>";
+        PyObject *modname = NULL;
+        if (mod != NULL) {
+            if (PyUnicode_Check(mod)) {
+                modname = mod;
+                Py_INCREF(modname);
+            }
+            else if (PyModule_Check(mod)) {
+                modname = PyModule_GetNameObject(mod);
+                if (modname == NULL)
                     PyErr_Clear();
             }
         }
-        else if (mod && PyModule_Check(mod)) {
-            modname = PyModule_GetName(mod);
-            if (modname == NULL) {
-                PyErr_Clear();
-                modname = "builtins";
+        if (modname != NULL) {
+            if (PyUnicode_CompareWithASCIIString(modname, "builtins") != 0) {
+                PyObject *result;
+                result = PyUnicode_FromFormat("<%U.%s>", modname,
+                                              fn->m_ml->ml_name);
+                Py_DECREF(modname);
+                return result;
             }
+            Py_DECREF(modname);
         }
-        else {
-            modname = "builtins";
-        }
-        if (strcmp(modname, "builtins") != 0)
-            return PyUnicode_FromFormat("<%s.%s>",
-                                        modname,
-                                        fn->m_ml->ml_name);
-        else
-            return PyUnicode_FromFormat("<%s>",
-                                        fn->m_ml->ml_name);
+        return PyUnicode_FromFormat("<%s>", fn->m_ml->ml_name);
     }
     else {
         /* built-in method: try to return