py/inlineasm: Add ability to specify return type of asm_thumb funcs.

Supported return types are: object, bool, int, uint.

For example:

@micropython.asm_thumb
def foo(r0, r1) -> uint:
    add(r0, r0, r1)

1 files changed, 10 insertions, 2 deletions

diff --git a/py/nativeglue.c b/py/nativeglue.c
index 3220996f95..cc0d61ce96 100644
--- a/py/nativeglue.c
+++ b/py/nativeglue.c
@@ -34,14 +34,14 @@
 #include "py/emitglue.h"
 #include "py/bc.h"
 
-#if MICROPY_EMIT_NATIVE
-
 #if 0 // print debugging info
 #define DEBUG_printf DEBUG_printf
 #else // don't print debugging info
 #define DEBUG_printf(...) (void)0
 #endif
 
+#if MICROPY_EMIT_NATIVE
+
 // convert a Micro Python object to a valid native value based on type
 mp_uint_t mp_convert_obj_to_native(mp_obj_t obj, mp_uint_t type) {
     DEBUG_printf("mp_convert_obj_to_native(%p, " UINT_FMT ")\n", obj, type);
@@ -61,6 +61,10 @@ mp_uint_t mp_convert_obj_to_native(mp_obj_t obj, mp_uint_t type) {
     }
 }
 
+#endif
+
+#if MICROPY_EMIT_NATIVE || MICROPY_EMIT_INLINE_THUMB
+
 // convert a native value to a Micro Python object based on type
 mp_obj_t mp_convert_native_to_obj(mp_uint_t val, mp_uint_t type) {
     DEBUG_printf("mp_convert_native_to_obj(" UINT_FMT ", " UINT_FMT ")\n", val, type);
@@ -73,6 +77,10 @@ mp_obj_t mp_convert_native_to_obj(mp_uint_t val, mp_uint_t type) {
     }
 }
 
+#endif
+
+#if MICROPY_EMIT_NATIVE
+
 // wrapper that accepts n_args and n_kw in one argument
 // (native emitter can only pass at most 3 arguments to a function)
 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) {