py: Change nlr_jump to nlr_raise, to aid in debugging.

This does not affect code size or performance when debugging turned off.

To address issue #420.

1 files changed, 13 insertions, 0 deletions

diff --git a/py/nlr.h b/py/nlr.h
index b94ca7d3f..ce62334fd 100644
--- a/py/nlr.h
+++ b/py/nlr.h
@@ -26,3 +26,16 @@ struct _nlr_buf_t {
 unsigned int nlr_push(nlr_buf_t *);
 void nlr_pop(void);
 void nlr_jump(void *val) __attribute__((noreturn));
+
+// use nlr_raise instead of nlr_jump so that debugging is easier
+#ifndef DEBUG
+#define nlr_raise(val) nlr_jump(val)
+#else
+#define nlr_raise(val) \
+    do { \
+        void *_val = val; \
+        assert(_val != NULL); \
+        assert(mp_obj_is_exception_instance(_val)); \
+        nlr_jump(_val); \
+    } while (0)
+#endif