py/runtime: mp_raise_msg(): Accept NULL argument for message.

In this case, raise an exception without a message.

This would allow to shove few code bytes comparing to currently used
mp_raise_msg(..., "") pattern. (Actual savings depend on function code
alignment used by a particular platform.)

1 files changed, 5 insertions, 1 deletions

diff --git a/py/runtime.c b/py/runtime.c
index db6a6f18f9..1c25350ec4 100644
--- a/py/runtime.c
+++ b/py/runtime.c
@@ -1431,7 +1431,11 @@ void *m_malloc_fail(size_t num_bytes) {
 }
 
 NORETURN void mp_raise_msg(const mp_obj_type_t *exc_type, const char *msg) {
-    nlr_raise(mp_obj_new_exception_msg(exc_type, msg));
+    if (msg == NULL) {
+        nlr_raise(mp_obj_new_exception(exc_type));
+    } else {
+        nlr_raise(mp_obj_new_exception_msg(exc_type, msg));
+    }
 }
 
 NORETURN void mp_raise_ValueError(const char *msg) {