vm: Support strict stackless mode, with proper exception reporting.

I.e. in this mode, C stack will never be used to call a Python function,
but if there's no free heap for a call, it will be reported as
RuntimeError (as expected), not MemoryError.

1 files changed, 7 insertions, 2 deletions

diff --git a/py/stackctrl.c b/py/stackctrl.c
index 7d7bbc1be..4c5165372 100644
--- a/py/stackctrl.c
+++ b/py/stackctrl.c
@@ -27,6 +27,7 @@
 #include "py/mpstate.h"
 #include "py/nlr.h"
 #include "py/obj.h"
+#include "py/runtime.h"
 #include "py/stackctrl.h"
 
 void mp_stack_ctrl_init(void) {
@@ -46,10 +47,14 @@ void mp_stack_set_limit(mp_uint_t limit) {
     MP_STATE_VM(stack_limit) = limit;
 }
 
+void mp_exc_recursion_depth(void) {
+    nlr_raise(mp_obj_new_exception_arg1(&mp_type_RuntimeError,
+        MP_OBJ_NEW_QSTR(MP_QSTR_maximum_space_recursion_space_depth_space_exceeded)));
+}
+
 void mp_stack_check(void) {
     if (mp_stack_usage() >= MP_STATE_VM(stack_limit)) {
-        nlr_raise(mp_obj_new_exception_arg1(&mp_type_RuntimeError,
-            MP_OBJ_NEW_QSTR(MP_QSTR_maximum_space_recursion_space_depth_space_exceeded)));
+        mp_exc_recursion_depth();
     }
 }