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

pfalcon · pfalcon · commit 4b3da603248f · 2017-02-24T09:57:25.000-05:00
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.)
diff --git 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) {

Original file line number	Diff line number	Diff line change
`@@ -1431,7 +1431,11 @@ void *m_malloc_fail(size_t num_bytes) {`
`1431`	`1431`	`}`
`1432`	`1432`
`1433`	`1433`	`NORETURN void mp_raise_msg(const mp_obj_type_t exc_type, const char msg) {`
`1434`		`- nlr_raise(mp_obj_new_exception_msg(exc_type, msg));`
	`1434`	`+ if (msg == NULL) {`
	`1435`	`+ nlr_raise(mp_obj_new_exception(exc_type));`
	`1436`	`+ } else {`
	`1437`	`+ nlr_raise(mp_obj_new_exception_msg(exc_type, msg));`
	`1438`	`+ }`
`1435`	`1439`	`}`
`1436`	`1440`
`1437`	`1441`	`NORETURN void mp_raise_ValueError(const char *msg) {`