py: Wrap all obj-ptr conversions in MP_OBJ_TO_PTR/MP_OBJ_FROM_PTR.
This allows the mp_obj_t type to be configured to something other than a
pointer-sized primitive type.
This patch also includes additional changes to allow the code to compile
when sizeof(mp_uint_t) != sizeof(void*), such as using size_t instead of
mp_uint_t, and various casts.
diff --git a/py/runtime.h b/py/runtime.h
index 1449619..10b133e 100644
--- a/py/runtime.h
+++ b/py/runtime.h
@@ -140,8 +140,8 @@
mp_obj_t mp_native_call_function_n_kw(mp_obj_t fun_in, mp_uint_t n_args_kw, const mp_obj_t *args);
void mp_native_raise(mp_obj_t o);
-#define mp_sys_path ((mp_obj_t)&MP_STATE_VM(mp_sys_path_obj))
-#define mp_sys_argv ((mp_obj_t)&MP_STATE_VM(mp_sys_argv_obj))
+#define mp_sys_path (MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_sys_path_obj)))
+#define mp_sys_argv (MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_sys_argv_obj)))
#if MICROPY_WARNINGS
void mp_warning(const char *msg, ...);