py: Pass keyword args to native functions by using the stack.
Passing keyword arguments to a native function now no longer requires
heap memory. The kw_args map is created on the stack using the args
array as the table.
diff --git a/py/objfun.c b/py/objfun.c
index fbc0cab..9ce517f 100644
--- a/py/objfun.c
+++ b/py/objfun.c
@@ -54,15 +54,11 @@
if (self->is_kw) {
// function allows keywords
- // TODO if n_kw==0 then don't allocate any memory for map (either pass NULL or allocate it on the heap)
- mp_map_t *kw_args = mp_map_new(n_kw);
- for (int i = 0; i < 2 * n_kw; i += 2) {
- mp_map_lookup(kw_args, args[n_args + i], MP_MAP_LOOKUP_ADD_IF_NOT_FOUND)->value = args[n_args + i + 1];
- }
- mp_obj_t res = ((mp_fun_kw_t)self->fun)(n_args, args, kw_args);
- // TODO clean up kw_args
+ // we create a map directly from the given args array
+ mp_map_t kw_args;
+ mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
- return res;
+ return ((mp_fun_kw_t)self->fun)(n_args, args, &kw_args);
} else if (self->n_args_min <= 3 && self->n_args_min == self->n_args_max) {
// function requires a fixed number of arguments